socket.c 234.0 KB
Newer Older
1
/* SCTP kernel implementation
L
Linus Torvalds 已提交
2 3 4 5 6 7 8
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2003 Intel Corp.
 * Copyright (c) 2001-2002 Nokia, Inc.
 * Copyright (c) 2001 La Monte H.P. Yarroll
 *
9
 * This file is part of the SCTP kernel implementation
L
Linus Torvalds 已提交
10 11 12 13 14 15 16 17
 *
 * These functions interface with the sockets layer to implement the
 * SCTP Extensions for the Sockets API.
 *
 * Note that the descriptions from the specification are USER level
 * functions--this file is the functions which populate the struct proto
 * for SCTP which is the BOTTOM of the sockets interface.
 *
18
 * This SCTP implementation is free software;
L
Linus Torvalds 已提交
19 20 21 22 23
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
24
 * This SCTP implementation is distributed in the hope that it
L
Linus Torvalds 已提交
25 26 27 28 29 30
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
31 32
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
L
Linus Torvalds 已提交
33 34 35
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
36
 *    lksctp developers <linux-sctp@vger.kernel.org>
L
Linus Torvalds 已提交
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52
 *
 * Written or modified by:
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Narasimha Budihal     <narsi@refcode.org>
 *    Karl Knutson          <karl@athena.chicago.il.us>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Xingang Guo           <xingang.guo@intel.com>
 *    Daisy Chang           <daisyc@us.ibm.com>
 *    Sridhar Samudrala     <samudrala@us.ibm.com>
 *    Inaky Perez-Gonzalez  <inaky.gonzalez@intel.com>
 *    Ardelle Fan	    <ardelle.fan@intel.com>
 *    Ryan Layer	    <rmlayer@us.ibm.com>
 *    Anup Pemmaiah         <pemmaiah@cc.usu.edu>
 *    Kevin Gao             <kevin.gao@intel.com>
 */

53 54
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

H
Herbert Xu 已提交
55
#include <crypto/hash.h>
L
Linus Torvalds 已提交
56 57 58 59
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/time.h>
60
#include <linux/sched/signal.h>
L
Linus Torvalds 已提交
61
#include <linux/ip.h>
62
#include <linux/capability.h>
L
Linus Torvalds 已提交
63 64 65
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
66
#include <linux/slab.h>
67
#include <linux/file.h>
68
#include <linux/compat.h>
L
Linus Torvalds 已提交
69 70 71 72 73 74

#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
75
#include <net/busy_poll.h>
L
Linus Torvalds 已提交
76 77

#include <linux/socket.h> /* for sa_family_t */
78
#include <linux/export.h>
L
Linus Torvalds 已提交
79 80 81
#include <net/sock.h>
#include <net/sctp/sctp.h>
#include <net/sctp/sm.h>
82
#include <net/sctp/stream_sched.h>
L
Linus Torvalds 已提交
83 84 85 86

/* Forward declarations for internal helper functions. */
static int sctp_writeable(struct sock *sk);
static void sctp_wfree(struct sk_buff *skb);
87
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
88
				size_t msg_len);
89
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p);
L
Linus Torvalds 已提交
90 91 92
static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
static int sctp_wait_for_accept(struct sock *sk, long timeo);
static void sctp_wait_for_close(struct sock *sk, long timeo);
93
static void sctp_destruct_sock(struct sock *sk);
L
Linus Torvalds 已提交
94 95 96 97 98 99 100 101 102 103
static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
					union sctp_addr *addr, int len);
static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
static int sctp_bindx_rem(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf_add_ip(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf_del_ip(struct sock *, struct sockaddr *, int);
static int sctp_send_asconf(struct sctp_association *asoc,
			    struct sctp_chunk *chunk);
static int sctp_do_bind(struct sock *, union sctp_addr *, int);
static int sctp_autobind(struct sock *sk);
104 105 106
static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
			      struct sctp_association *assoc,
			      enum sctp_socket_type type);
L
Linus Torvalds 已提交
107

108
static unsigned long sctp_memory_pressure;
E
Eric Dumazet 已提交
109
static atomic_long_t sctp_memory_allocated;
110
struct percpu_counter sctp_sockets_allocated;
111

112
static void sctp_enter_memory_pressure(struct sock *sk)
113 114 115 116 117
{
	sctp_memory_pressure = 1;
}


L
Linus Torvalds 已提交
118 119 120
/* Get the sndbuf space available at the time on the association.  */
static inline int sctp_wspace(struct sctp_association *asoc)
{
121
	int amt;
L
Linus Torvalds 已提交
122

123 124 125
	if (asoc->ep->sndbuf_policy)
		amt = asoc->sndbuf_used;
	else
126
		amt = sk_wmem_alloc_get(asoc->base.sk);
127 128 129 130 131 132 133 134 135

	if (amt >= asoc->base.sk->sk_sndbuf) {
		if (asoc->base.sk->sk_userlocks & SOCK_SNDBUF_LOCK)
			amt = 0;
		else {
			amt = sk_stream_wspace(asoc->base.sk);
			if (amt < 0)
				amt = 0;
		}
136
	} else {
137
		amt = asoc->base.sk->sk_sndbuf - amt;
138
	}
L
Linus Torvalds 已提交
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
	return amt;
}

/* Increment the used sndbuf space count of the corresponding association by
 * the size of the outgoing data chunk.
 * Also, set the skb destructor for sndbuf accounting later.
 *
 * Since it is always 1-1 between chunk and skb, and also a new skb is always
 * allocated for chunk bundling in sctp_packet_transmit(), we can use the
 * destructor in the data chunk skb for the purpose of the sndbuf space
 * tracking.
 */
static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
{
	struct sctp_association *asoc = chunk->asoc;
	struct sock *sk = asoc->base.sk;

	/* The sndbuf space is tracked per association.  */
	sctp_association_hold(asoc);

X
Xin Long 已提交
159 160 161
	if (chunk->shkey)
		sctp_auth_shkey_hold(chunk->shkey);

162 163
	skb_set_owner_w(chunk->skb, sk);

L
Linus Torvalds 已提交
164 165
	chunk->skb->destructor = sctp_wfree;
	/* Save the chunk pointer in skb for sctp_wfree to use later.  */
166
	skb_shinfo(chunk->skb)->destructor_arg = chunk;
L
Linus Torvalds 已提交
167

168 169 170 171
	asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

172
	refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc);
173 174
	sk->sk_wmem_queued += chunk->skb->truesize;
	sk_mem_charge(sk, chunk->skb->truesize);
L
Linus Torvalds 已提交
175 176
}

177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
static void sctp_clear_owner_w(struct sctp_chunk *chunk)
{
	skb_orphan(chunk->skb);
}

static void sctp_for_each_tx_datachunk(struct sctp_association *asoc,
				       void (*cb)(struct sctp_chunk *))

{
	struct sctp_outq *q = &asoc->outqueue;
	struct sctp_transport *t;
	struct sctp_chunk *chunk;

	list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
		list_for_each_entry(chunk, &t->transmitted, transmitted_list)
			cb(chunk);

194
	list_for_each_entry(chunk, &q->retransmit, transmitted_list)
195 196
		cb(chunk);

197
	list_for_each_entry(chunk, &q->sacked, transmitted_list)
198 199
		cb(chunk);

200
	list_for_each_entry(chunk, &q->abandoned, transmitted_list)
201 202 203 204 205 206
		cb(chunk);

	list_for_each_entry(chunk, &q->out_chunk_list, list)
		cb(chunk);
}

207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222
static void sctp_for_each_rx_skb(struct sctp_association *asoc, struct sock *sk,
				 void (*cb)(struct sk_buff *, struct sock *))

{
	struct sk_buff *skb, *tmp;

	sctp_skb_for_each(skb, &asoc->ulpq.lobby, tmp)
		cb(skb, sk);

	sctp_skb_for_each(skb, &asoc->ulpq.reasm, tmp)
		cb(skb, sk);

	sctp_skb_for_each(skb, &asoc->ulpq.reasm_uo, tmp)
		cb(skb, sk);
}

L
Linus Torvalds 已提交
223 224 225 226 227 228 229 230 231 232 233 234
/* Verify that this is a valid address. */
static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
				   int len)
{
	struct sctp_af *af;

	/* Verify basic sockaddr. */
	af = sctp_sockaddr_af(sctp_sk(sk), addr, len);
	if (!af)
		return -EINVAL;

	/* Is this a valid SCTP address?  */
235
	if (!af->addr_valid(addr, sctp_sk(sk), NULL))
L
Linus Torvalds 已提交
236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
		return -EINVAL;

	if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))
		return -EINVAL;

	return 0;
}

/* Look up the association by its id.  If this is not a UDP-style
 * socket, the ID field is always ignored.
 */
struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id)
{
	struct sctp_association *asoc = NULL;

	/* If this is not a UDP-style socket, assoc id should be ignored. */
	if (!sctp_style(sk, UDP)) {
		/* Return NULL if the socket state is not ESTABLISHED. It
		 * could be a TCP-style listening socket or a socket which
		 * hasn't yet called connect() to establish an association.
		 */
257
		if (!sctp_sstate(sk, ESTABLISHED) && !sctp_sstate(sk, CLOSING))
L
Linus Torvalds 已提交
258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289
			return NULL;

		/* Get the first and the only association from the list. */
		if (!list_empty(&sctp_sk(sk)->ep->asocs))
			asoc = list_entry(sctp_sk(sk)->ep->asocs.next,
					  struct sctp_association, asocs);
		return asoc;
	}

	/* Otherwise this is a UDP-style socket. */
	if (!id || (id == (sctp_assoc_t)-1))
		return NULL;

	spin_lock_bh(&sctp_assocs_id_lock);
	asoc = (struct sctp_association *)idr_find(&sctp_assocs_id, (int)id);
	spin_unlock_bh(&sctp_assocs_id_lock);

	if (!asoc || (asoc->base.sk != sk) || asoc->base.dead)
		return NULL;

	return asoc;
}

/* Look up the transport from an address and an assoc id. If both address and
 * id are specified, the associations matching the address and the id should be
 * the same.
 */
static struct sctp_transport *sctp_addr_id2transport(struct sock *sk,
					      struct sockaddr_storage *addr,
					      sctp_assoc_t id)
{
	struct sctp_association *addr_asoc = NULL, *id_asoc = NULL;
290
	struct sctp_af *af = sctp_get_af_specific(addr->ss_family);
L
Linus Torvalds 已提交
291
	union sctp_addr *laddr = (union sctp_addr *)addr;
292 293
	struct sctp_transport *transport;

294
	if (!af || sctp_verify_addr(sk, laddr, af->sockaddr_len))
295
		return NULL;
L
Linus Torvalds 已提交
296 297

	addr_asoc = sctp_endpoint_lookup_assoc(sctp_sk(sk)->ep,
298
					       laddr,
L
Linus Torvalds 已提交
299 300 301 302 303 304 305 306 307
					       &transport);

	if (!addr_asoc)
		return NULL;

	id_asoc = sctp_id2assoc(sk, id);
	if (id_asoc && (id_asoc != addr_asoc))
		return NULL;

308
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
309 310 311 312 313 314 315 316 317 318 319 320 321 322 323
						(union sctp_addr *)addr);

	return transport;
}

/* API 3.1.2 bind() - UDP Style Syntax
 * The syntax of bind() is,
 *
 *   ret = bind(int sd, struct sockaddr *addr, int addrlen);
 *
 *   sd      - the socket descriptor returned by socket().
 *   addr    - the address structure (struct sockaddr_in or struct
 *             sockaddr_in6 [RFC 2553]),
 *   addr_len - the size of the address structure.
 */
324
static int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
L
Linus Torvalds 已提交
325 326 327
{
	int retval = 0;

328
	lock_sock(sk);
L
Linus Torvalds 已提交
329

330 331
	pr_debug("%s: sk:%p, addr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
332 333 334

	/* Disallow binding twice. */
	if (!sctp_sk(sk)->ep->base.bind_addr.port)
F
Frank Filz 已提交
335
		retval = sctp_do_bind(sk, (union sctp_addr *)addr,
L
Linus Torvalds 已提交
336 337 338 339
				      addr_len);
	else
		retval = -EINVAL;

340
	release_sock(sk);
L
Linus Torvalds 已提交
341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356

	return retval;
}

static long sctp_get_port_local(struct sock *, union sctp_addr *);

/* Verify this is a valid sockaddr. */
static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
					union sctp_addr *addr, int len)
{
	struct sctp_af *af;

	/* Check minimum size.  */
	if (len < sizeof (struct sockaddr))
		return NULL;

357 358 359
	if (!opt->pf->af_supported(addr->sa.sa_family, opt))
		return NULL;

360 361
	/* V4 mapped address are really of AF_INET family */
	if (addr->sa.sa_family == AF_INET6 &&
362 363 364
	    ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
	    !opt->pf->af_supported(AF_INET, opt))
		return NULL;
L
Linus Torvalds 已提交
365 366 367 368 369 370 371 372 373 374 375

	/* If we get this far, af is valid. */
	af = sctp_get_af_specific(addr->sa.sa_family);

	if (len < af->sockaddr_len)
		return NULL;

	return af;
}

/* Bind a local address either to an endpoint or to an association.  */
376
static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
L
Linus Torvalds 已提交
377
{
378
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
379 380 381 382 383 384 385 386 387
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
	struct sctp_bind_addr *bp = &ep->base.bind_addr;
	struct sctp_af *af;
	unsigned short snum;
	int ret = 0;

	/* Common sockaddr verification. */
	af = sctp_sockaddr_af(sp, addr, len);
F
Frank Filz 已提交
388
	if (!af) {
389 390
		pr_debug("%s: sk:%p, newaddr:%p, len:%d EINVAL\n",
			 __func__, sk, addr, len);
L
Linus Torvalds 已提交
391
		return -EINVAL;
F
Frank Filz 已提交
392 393 394 395
	}

	snum = ntohs(addr->v4.sin_port);

396 397
	pr_debug("%s: sk:%p, new addr:%pISc, port:%d, new port:%d, len:%d\n",
		 __func__, sk, &addr->sa, bp->port, snum, len);
L
Linus Torvalds 已提交
398 399 400 401 402

	/* PF specific bind() address verification. */
	if (!sp->pf->bind_verify(sp, addr))
		return -EADDRNOTAVAIL;

403 404 405 406 407 408 409 410
	/* We must either be unbound, or bind to the same port.
	 * It's OK to allow 0 ports if we are already bound.
	 * We'll just inhert an already bound port in this case
	 */
	if (bp->port) {
		if (!snum)
			snum = bp->port;
		else if (snum != bp->port) {
411 412
			pr_debug("%s: new port %d doesn't match existing port "
				 "%d\n", __func__, snum, bp->port);
413 414
			return -EINVAL;
		}
L
Linus Torvalds 已提交
415 416
	}

417
	if (snum && snum < inet_prot_sock(net) &&
418
	    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
L
Linus Torvalds 已提交
419 420
		return -EACCES;

421 422 423 424 425 426
	/* See if the address matches any of the addresses we may have
	 * already bound before checking against other endpoints.
	 */
	if (sctp_bind_addr_match(bp, addr, sp))
		return -EINVAL;

L
Linus Torvalds 已提交
427 428 429 430
	/* Make sure we are allowed to bind here.
	 * The function sctp_get_port_local() does duplicate address
	 * detection.
	 */
431
	addr->v4.sin_port = htons(snum);
L
Linus Torvalds 已提交
432
	if ((ret = sctp_get_port_local(sk, addr))) {
433
		return -EADDRINUSE;
L
Linus Torvalds 已提交
434 435 436 437
	}

	/* Refresh ephemeral port.  */
	if (!bp->port)
E
Eric Dumazet 已提交
438
		bp->port = inet_sk(sk)->inet_num;
L
Linus Torvalds 已提交
439

440 441 442
	/* Add the address to the bind address list.
	 * Use GFP_ATOMIC since BHs will be disabled.
	 */
443 444
	ret = sctp_add_bind_addr(bp, addr, af->sockaddr_len,
				 SCTP_ADDR_SRC, GFP_ATOMIC);
L
Linus Torvalds 已提交
445 446 447

	/* Copy back into socket for getsockname() use. */
	if (!ret) {
E
Eric Dumazet 已提交
448
		inet_sk(sk)->inet_sport = htons(inet_sk(sk)->inet_num);
449
		sp->pf->to_sk_saddr(addr, sk);
L
Linus Torvalds 已提交
450 451 452 453 454 455 456
	}

	return ret;
}

 /* ADDIP Section 4.1.1 Congestion Control of ASCONF Chunks
 *
457
 * R1) One and only one ASCONF Chunk MAY be in transit and unacknowledged
L
Linus Torvalds 已提交
458
 * at any one time.  If a sender, after sending an ASCONF chunk, decides
459
 * it needs to transfer another ASCONF Chunk, it MUST wait until the
L
Linus Torvalds 已提交
460
 * ASCONF-ACK Chunk returns from the previous ASCONF Chunk before sending a
461 462
 * subsequent ASCONF. Note this restriction binds each side, so at any
 * time two ASCONF may be in-transit on any given association (one sent
L
Linus Torvalds 已提交
463 464 465 466 467
 * from each endpoint).
 */
static int sctp_send_asconf(struct sctp_association *asoc,
			    struct sctp_chunk *chunk)
{
468
	struct net 	*net = sock_net(asoc->base.sk);
L
Linus Torvalds 已提交
469 470 471 472
	int		retval = 0;

	/* If there is an outstanding ASCONF chunk, queue it for later
	 * transmission.
473
	 */
L
Linus Torvalds 已提交
474
	if (asoc->addip_last_asconf) {
475
		list_add_tail(&chunk->list, &asoc->addip_chunk_list);
476
		goto out;
L
Linus Torvalds 已提交
477 478 479 480
	}

	/* Hold the chunk until an ASCONF_ACK is received. */
	sctp_chunk_hold(chunk);
481
	retval = sctp_primitive_ASCONF(net, asoc, chunk);
L
Linus Torvalds 已提交
482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	if (retval)
		sctp_chunk_free(chunk);
	else
		asoc->addip_last_asconf = chunk;

out:
	return retval;
}

/* Add a list of addresses as bind addresses to local endpoint or
 * association.
 *
 * Basically run through each address specified in the addrs/addrcnt
 * array/length pair, determine if it is IPv6 or IPv4 and call
 * sctp_do_bind() on it.
 *
 * If any of them fails, then the operation will be reversed and the
 * ones that were added will be removed.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
503
static int sctp_bindx_add(struct sock *sk, struct sockaddr *addrs, int addrcnt)
L
Linus Torvalds 已提交
504 505 506 507 508 509 510
{
	int cnt;
	int retval = 0;
	void *addr_buf;
	struct sockaddr *sa_addr;
	struct sctp_af *af;

511 512
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n", __func__, sk,
		 addrs, addrcnt);
L
Linus Torvalds 已提交
513 514 515 516 517 518

	addr_buf = addrs;
	for (cnt = 0; cnt < addrcnt; cnt++) {
		/* The list may contain either IPv4 or IPv6 address;
		 * determine the address length for walking thru the list.
		 */
J
Joe Perches 已提交
519
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
520 521 522 523 524 525
		af = sctp_get_af_specific(sa_addr->sa_family);
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_add;
		}

526
		retval = sctp_do_bind(sk, (union sctp_addr *)sa_addr,
L
Linus Torvalds 已提交
527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
				      af->sockaddr_len);

		addr_buf += af->sockaddr_len;

err_bindx_add:
		if (retval < 0) {
			/* Failed. Cleanup the ones that have been added */
			if (cnt > 0)
				sctp_bindx_rem(sk, addrs, cnt);
			return retval;
		}
	}

	return retval;
}

/* Send an ASCONF chunk with Add IP address parameters to all the peers of the
 * associations that are part of the endpoint indicating that a list of local
 * addresses are added to the endpoint.
 *
547
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
548 549 550 551 552
 * association, we do not send the chunk for that association.  But it will not
 * affect other associations.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
553
static int sctp_send_asconf_add_ip(struct sock		*sk,
L
Linus Torvalds 已提交
554 555 556
				   struct sockaddr	*addrs,
				   int 			addrcnt)
{
557
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
558 559 560 561 562 563 564
	struct sctp_sock		*sp;
	struct sctp_endpoint		*ep;
	struct sctp_association		*asoc;
	struct sctp_bind_addr		*bp;
	struct sctp_chunk		*chunk;
	struct sctp_sockaddr_entry	*laddr;
	union sctp_addr			*addr;
565
	union sctp_addr			saveaddr;
L
Linus Torvalds 已提交
566 567 568 569 570 571
	void				*addr_buf;
	struct sctp_af			*af;
	struct list_head		*p;
	int 				i;
	int 				retval = 0;

572
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
573 574 575 576 577
		return retval;

	sp = sctp_sk(sk);
	ep = sp->ep;

578 579
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
580

581
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
582 583 584 585 586 587 588 589 590 591
		if (!asoc->peer.asconf_capable)
			continue;

		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_ADD_IP)
			continue;

		if (!sctp_state(asoc, ESTABLISHED))
			continue;

		/* Check if any address in the packed array of addresses is
592 593
		 * in the bind address list of the association. If so,
		 * do not send the asconf chunk to its peer, but continue with
L
Linus Torvalds 已提交
594 595 596 597
		 * other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
598
			addr = addr_buf;
L
Linus Torvalds 已提交
599 600 601 602 603 604 605 606 607 608 609 610 611 612
			af = sctp_get_af_specific(addr->v4.sin_family);
			if (!af) {
				retval = -EINVAL;
				goto out;
			}

			if (sctp_assoc_lookup_laddr(asoc, addr))
				break;

			addr_buf += af->sockaddr_len;
		}
		if (i < addrcnt)
			continue;

613 614
		/* Use the first valid address in bind addr list of
		 * association as Address Parameter of ASCONF CHUNK.
L
Linus Torvalds 已提交
615 616 617 618
		 */
		bp = &asoc->base.bind_addr;
		p = bp->address_list.next;
		laddr = list_entry(p, struct sctp_sockaddr_entry, list);
619
		chunk = sctp_make_asconf_update_ip(asoc, &laddr->a, addrs,
L
Linus Torvalds 已提交
620 621 622 623 624 625
						   addrcnt, SCTP_PARAM_ADD_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

626 627
		/* Add the new addresses to the bind address list with
		 * use_as_src set to 0.
L
Linus Torvalds 已提交
628
		 */
629 630
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
631
			addr = addr_buf;
632 633
			af = sctp_get_af_specific(addr->v4.sin_family);
			memcpy(&saveaddr, addr, af->sockaddr_len);
634
			retval = sctp_add_bind_addr(bp, &saveaddr,
635
						    sizeof(saveaddr),
636
						    SCTP_ADDR_NEW, GFP_ATOMIC);
637 638
			addr_buf += af->sockaddr_len;
		}
639 640 641 642 643 644
		if (asoc->src_out_of_asoc_ok) {
			struct sctp_transport *trans;

			list_for_each_entry(trans,
			    &asoc->peer.transport_addr_list, transports) {
				/* Clear the source and route cache */
645
				sctp_transport_dst_release(trans);
646 647 648 649
				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
				    2*asoc->pathmtu, 4380));
				trans->ssthresh = asoc->peer.i.a_rwnd;
				trans->rto = asoc->rto_initial;
650
				sctp_max_rto(asoc, trans);
651 652 653 654 655 656
				trans->rtt = trans->srtt = trans->rttvar = 0;
				sctp_transport_route(trans, NULL,
				    sctp_sk(asoc->base.sk));
			}
		}
		retval = sctp_send_asconf(asoc, chunk);
L
Linus Torvalds 已提交
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677
	}

out:
	return retval;
}

/* Remove a list of addresses from bind addresses list.  Do not remove the
 * last address.
 *
 * Basically run through each address specified in the addrs/addrcnt
 * array/length pair, determine if it is IPv6 or IPv4 and call
 * sctp_del_bind() on it.
 *
 * If any of them fails, then the operation will be reversed and the
 * ones that were removed will be added back.
 *
 * At least one address has to be left; if only one address is
 * available, the operation will return -EBUSY.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
678
static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
L
Linus Torvalds 已提交
679 680 681 682 683 684 685
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
	int cnt;
	struct sctp_bind_addr *bp = &ep->base.bind_addr;
	int retval = 0;
	void *addr_buf;
686
	union sctp_addr *sa_addr;
L
Linus Torvalds 已提交
687 688
	struct sctp_af *af;

689 690
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
691 692 693 694 695 696 697 698 699 700 701 702 703

	addr_buf = addrs;
	for (cnt = 0; cnt < addrcnt; cnt++) {
		/* If the bind address list is empty or if there is only one
		 * bind address, there is nothing more to be removed (we need
		 * at least one address here).
		 */
		if (list_empty(&bp->address_list) ||
		    (sctp_list_single_entry(&bp->address_list))) {
			retval = -EBUSY;
			goto err_bindx_rem;
		}

J
Joe Perches 已提交
704
		sa_addr = addr_buf;
705
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
L
Linus Torvalds 已提交
706 707 708 709
		if (!af) {
			retval = -EINVAL;
			goto err_bindx_rem;
		}
710 711 712 713 714 715

		if (!af->addr_valid(sa_addr, sp, NULL)) {
			retval = -EADDRNOTAVAIL;
			goto err_bindx_rem;
		}

716 717
		if (sa_addr->v4.sin_port &&
		    sa_addr->v4.sin_port != htons(bp->port)) {
L
Linus Torvalds 已提交
718 719 720 721
			retval = -EINVAL;
			goto err_bindx_rem;
		}

722 723 724
		if (!sa_addr->v4.sin_port)
			sa_addr->v4.sin_port = htons(bp->port);

L
Linus Torvalds 已提交
725 726 727 728 729 730 731
		/* FIXME - There is probably a need to check if sk->sk_saddr and
		 * sk->sk_rcv_addr are currently set to one of the addresses to
		 * be removed. This is something which needs to be looked into
		 * when we are fixing the outstanding issues with multi-homing
		 * socket routing and failover schemes. Refer to comments in
		 * sctp_do_bind(). -daisy
		 */
732
		retval = sctp_del_bind_addr(bp, sa_addr);
L
Linus Torvalds 已提交
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750

		addr_buf += af->sockaddr_len;
err_bindx_rem:
		if (retval < 0) {
			/* Failed. Add the ones that has been removed back */
			if (cnt > 0)
				sctp_bindx_add(sk, addrs, cnt);
			return retval;
		}
	}

	return retval;
}

/* Send an ASCONF chunk with Delete IP address parameters to all the peers of
 * the associations that are part of the endpoint indicating that a list of
 * local addresses are removed from the endpoint.
 *
751
 * If any of the addresses is already in the bind address list of the
L
Linus Torvalds 已提交
752 753 754 755 756 757 758 759 760
 * association, we do not send the chunk for that association.  But it will not
 * affect other associations.
 *
 * Only sctp_setsockopt_bindx() is supposed to call this function.
 */
static int sctp_send_asconf_del_ip(struct sock		*sk,
				   struct sockaddr	*addrs,
				   int			addrcnt)
{
761
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
762 763 764
	struct sctp_sock	*sp;
	struct sctp_endpoint	*ep;
	struct sctp_association	*asoc;
765
	struct sctp_transport	*transport;
L
Linus Torvalds 已提交
766 767 768 769 770
	struct sctp_bind_addr	*bp;
	struct sctp_chunk	*chunk;
	union sctp_addr		*laddr;
	void			*addr_buf;
	struct sctp_af		*af;
771
	struct sctp_sockaddr_entry *saddr;
L
Linus Torvalds 已提交
772 773
	int 			i;
	int 			retval = 0;
774
	int			stored = 0;
L
Linus Torvalds 已提交
775

776
	chunk = NULL;
777
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
778 779 780 781 782
		return retval;

	sp = sctp_sk(sk);
	ep = sp->ep;

783 784
	pr_debug("%s: sk:%p, addrs:%p, addrcnt:%d\n",
		 __func__, sk, addrs, addrcnt);
L
Linus Torvalds 已提交
785

786
	list_for_each_entry(asoc, &ep->asocs, asocs) {
L
Linus Torvalds 已提交
787 788 789 790 791 792 793 794 795 796 797

		if (!asoc->peer.asconf_capable)
			continue;

		if (asoc->peer.addip_disabled_mask & SCTP_PARAM_DEL_IP)
			continue;

		if (!sctp_state(asoc, ESTABLISHED))
			continue;

		/* Check if any address in the packed array of addresses is
798
		 * not present in the bind address list of the association.
L
Linus Torvalds 已提交
799 800 801 802 803
		 * If so, do not send the asconf chunk to its peer, but
		 * continue with other associations.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
804
			laddr = addr_buf;
L
Linus Torvalds 已提交
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
			af = sctp_get_af_specific(laddr->v4.sin_family);
			if (!af) {
				retval = -EINVAL;
				goto out;
			}

			if (!sctp_assoc_lookup_laddr(asoc, laddr))
				break;

			addr_buf += af->sockaddr_len;
		}
		if (i < addrcnt)
			continue;

		/* Find one address in the association's bind address list
		 * that is not in the packed array of addresses. This is to
		 * make sure that we do not delete all the addresses in the
		 * association.
		 */
		bp = &asoc->base.bind_addr;
		laddr = sctp_find_unmatch_addr(bp, (union sctp_addr *)addrs,
					       addrcnt, sp);
827 828 829 830 831
		if ((laddr == NULL) && (addrcnt == 1)) {
			if (asoc->asconf_addr_del_pending)
				continue;
			asoc->asconf_addr_del_pending =
			    kzalloc(sizeof(union sctp_addr), GFP_ATOMIC);
832 833 834 835
			if (asoc->asconf_addr_del_pending == NULL) {
				retval = -ENOMEM;
				goto out;
			}
836 837 838 839 840 841 842 843 844 845 846 847 848
			asoc->asconf_addr_del_pending->sa.sa_family =
				    addrs->sa_family;
			asoc->asconf_addr_del_pending->v4.sin_port =
				    htons(bp->port);
			if (addrs->sa_family == AF_INET) {
				struct sockaddr_in *sin;

				sin = (struct sockaddr_in *)addrs;
				asoc->asconf_addr_del_pending->v4.sin_addr.s_addr = sin->sin_addr.s_addr;
			} else if (addrs->sa_family == AF_INET6) {
				struct sockaddr_in6 *sin6;

				sin6 = (struct sockaddr_in6 *)addrs;
A
Alexey Dobriyan 已提交
849
				asoc->asconf_addr_del_pending->v6.sin6_addr = sin6->sin6_addr;
850
			}
851 852 853 854 855

			pr_debug("%s: keep the last address asoc:%p %pISc at %p\n",
				 __func__, asoc, &asoc->asconf_addr_del_pending->sa,
				 asoc->asconf_addr_del_pending);

856 857 858 859
			asoc->src_out_of_asoc_ok = 1;
			stored = 1;
			goto skip_mkasconf;
		}
L
Linus Torvalds 已提交
860

861 862 863
		if (laddr == NULL)
			return -EINVAL;

864 865 866 867
		/* We do not need RCU protection throughout this loop
		 * because this is done under a socket lock from the
		 * setsockopt call.
		 */
L
Linus Torvalds 已提交
868 869 870 871 872 873 874
		chunk = sctp_make_asconf_update_ip(asoc, laddr, addrs, addrcnt,
						   SCTP_PARAM_DEL_IP);
		if (!chunk) {
			retval = -ENOMEM;
			goto out;
		}

875
skip_mkasconf:
876 877 878 879 880
		/* Reset use_as_src flag for the addresses in the bind address
		 * list that are to be deleted.
		 */
		addr_buf = addrs;
		for (i = 0; i < addrcnt; i++) {
J
Joe Perches 已提交
881
			laddr = addr_buf;
882
			af = sctp_get_af_specific(laddr->v4.sin_family);
883
			list_for_each_entry(saddr, &bp->address_list, list) {
884
				if (sctp_cmp_addr_exact(&saddr->a, laddr))
885
					saddr->state = SCTP_ADDR_DEL;
886 887 888
			}
			addr_buf += af->sockaddr_len;
		}
L
Linus Torvalds 已提交
889

890 891 892
		/* Update the route and saddr entries for all the transports
		 * as some of the addresses in the bind address list are
		 * about to be deleted and cannot be used as source addresses.
L
Linus Torvalds 已提交
893
		 */
894 895
		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
					transports) {
896
			sctp_transport_dst_release(transport);
897 898 899 900
			sctp_transport_route(transport, NULL,
					     sctp_sk(asoc->base.sk));
		}

901 902 903
		if (stored)
			/* We don't need to transmit ASCONF */
			continue;
904
		retval = sctp_send_asconf(asoc, chunk);
L
Linus Torvalds 已提交
905 906 907 908 909
	}
out:
	return retval;
}

910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
/* set addr events to assocs in the endpoint.  ep and addr_wq must be locked */
int sctp_asconf_mgmt(struct sctp_sock *sp, struct sctp_sockaddr_entry *addrw)
{
	struct sock *sk = sctp_opt2sk(sp);
	union sctp_addr *addr;
	struct sctp_af *af;

	/* It is safe to write port space in caller. */
	addr = &addrw->a;
	addr->v4.sin_port = htons(sp->ep->base.bind_addr.port);
	af = sctp_get_af_specific(addr->sa.sa_family);
	if (!af)
		return -EINVAL;
	if (sctp_verify_addr(sk, addr, af->sockaddr_len))
		return -EINVAL;

	if (addrw->state == SCTP_ADDR_NEW)
		return sctp_send_asconf_add_ip(sk, (struct sockaddr *)addr, 1);
	else
		return sctp_send_asconf_del_ip(sk, (struct sockaddr *)addr, 1);
}

L
Linus Torvalds 已提交
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
/* Helper for tunneling sctp_bindx() requests through sctp_setsockopt()
 *
 * API 8.1
 * int sctp_bindx(int sd, struct sockaddr *addrs, int addrcnt,
 *                int flags);
 *
 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 * or IPv6 addresses.
 *
 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 * Section 3.1.2 for this usage.
 *
 * addrs is a pointer to an array of one or more socket addresses. Each
 * address is contained in its appropriate structure (i.e. struct
 * sockaddr_in or struct sockaddr_in6) the family of the address type
V
Ville Nuorvala 已提交
948
 * must be used to distinguish the address length (note that this
L
Linus Torvalds 已提交
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986
 * representation is termed a "packed array" of addresses). The caller
 * specifies the number of addresses in the array with addrcnt.
 *
 * On success, sctp_bindx() returns 0. On failure, sctp_bindx() returns
 * -1, and sets errno to the appropriate error code.
 *
 * For SCTP, the port given in each socket address must be the same, or
 * sctp_bindx() will fail, setting errno to EINVAL.
 *
 * The flags parameter is formed from the bitwise OR of zero or more of
 * the following currently defined flags:
 *
 * SCTP_BINDX_ADD_ADDR
 *
 * SCTP_BINDX_REM_ADDR
 *
 * SCTP_BINDX_ADD_ADDR directs SCTP to add the given addresses to the
 * association, and SCTP_BINDX_REM_ADDR directs SCTP to remove the given
 * addresses from the association. The two flags are mutually exclusive;
 * if both are given, sctp_bindx() will fail with EINVAL. A caller may
 * not remove all addresses from an association; sctp_bindx() will
 * reject such an attempt with EINVAL.
 *
 * An application can use sctp_bindx(SCTP_BINDX_ADD_ADDR) to associate
 * additional addresses with an endpoint after calling bind().  Or use
 * sctp_bindx(SCTP_BINDX_REM_ADDR) to remove some addresses a listening
 * socket is associated with so that no new association accepted will be
 * associated with those addresses. If the endpoint supports dynamic
 * address a SCTP_BINDX_REM_ADDR or SCTP_BINDX_ADD_ADDR may cause a
 * endpoint to send the appropriate message to the peer to change the
 * peers address lists.
 *
 * Adding and removing addresses from a connected association is
 * optional functionality. Implementations that do not support this
 * functionality should return EOPNOTSUPP.
 *
 * Basically do nothing but copying the addresses from user to kernel
 * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
F
Frank Filz 已提交
987 988
 * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
 * from userspace.
L
Linus Torvalds 已提交
989 990 991 992 993 994 995 996 997 998 999 1000
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 * op        Operation to perform (add or remove, see the flags of
 *           sctp_bindx)
 *
 * Returns 0 if ok, <0 errno code on error.
 */
1001
static int sctp_setsockopt_bindx(struct sock *sk,
1002 1003
				 struct sockaddr __user *addrs,
				 int addrs_size, int op)
L
Linus Torvalds 已提交
1004 1005 1006 1007 1008 1009 1010 1011 1012
{
	struct sockaddr *kaddrs;
	int err;
	int addrcnt = 0;
	int walk_size = 0;
	struct sockaddr *sa_addr;
	void *addr_buf;
	struct sctp_af *af;

1013 1014
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d opt:%d\n",
		 __func__, sk, addrs, addrs_size, op);
L
Linus Torvalds 已提交
1015 1016 1017 1018

	if (unlikely(addrs_size <= 0))
		return -EINVAL;

1019 1020 1021
	kaddrs = vmemdup_user(addrs, addrs_size);
	if (unlikely(IS_ERR(kaddrs)))
		return PTR_ERR(kaddrs);
L
Linus Torvalds 已提交
1022

1023
	/* Walk through the addrs buffer and count the number of addresses. */
L
Linus Torvalds 已提交
1024 1025
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
1026
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
1027
			kvfree(kaddrs);
1028 1029 1030
			return -EINVAL;
		}

J
Joe Perches 已提交
1031
		sa_addr = addr_buf;
L
Linus Torvalds 已提交
1032 1033 1034 1035
		af = sctp_get_af_specific(sa_addr->sa_family);

		/* If the address family is not supported or if this address
		 * causes the address buffer to overflow return EINVAL.
1036
		 */
L
Linus Torvalds 已提交
1037
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
1038
			kvfree(kaddrs);
L
Linus Torvalds 已提交
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
			return -EINVAL;
		}
		addrcnt++;
		addr_buf += af->sockaddr_len;
		walk_size += af->sockaddr_len;
	}

	/* Do the work. */
	switch (op) {
	case SCTP_BINDX_ADD_ADDR:
		err = sctp_bindx_add(sk, kaddrs, addrcnt);
		if (err)
			goto out;
		err = sctp_send_asconf_add_ip(sk, kaddrs, addrcnt);
		break;

	case SCTP_BINDX_REM_ADDR:
		err = sctp_bindx_rem(sk, kaddrs, addrcnt);
		if (err)
			goto out;
		err = sctp_send_asconf_del_ip(sk, kaddrs, addrcnt);
		break;

	default:
		err = -EINVAL;
		break;
1065
	}
L
Linus Torvalds 已提交
1066 1067

out:
1068
	kvfree(kaddrs);
L
Linus Torvalds 已提交
1069 1070 1071 1072

	return err;
}

F
Frank Filz 已提交
1073 1074 1075 1076 1077
/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
 *
 * Common routine for handling connect() and sctp_connectx().
 * Connect will come in with just a single address.
 */
1078
static int __sctp_connect(struct sock *sk,
F
Frank Filz 已提交
1079
			  struct sockaddr *kaddrs,
1080 1081
			  int addrs_size,
			  sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1082
{
1083
	struct net *net = sock_net(sk);
F
Frank Filz 已提交
1084 1085 1086 1087 1088 1089
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sctp_association *asoc = NULL;
	struct sctp_association *asoc2;
	struct sctp_transport *transport;
	union sctp_addr to;
X
Xin Long 已提交
1090
	enum sctp_scope scope;
F
Frank Filz 已提交
1091 1092 1093 1094
	long timeo;
	int err = 0;
	int addrcnt = 0;
	int walk_size = 0;
1095
	union sctp_addr *sa_addr = NULL;
F
Frank Filz 已提交
1096
	void *addr_buf;
1097
	unsigned short port;
1098
	unsigned int f_flags = 0;
F
Frank Filz 已提交
1099 1100 1101 1102 1103 1104 1105 1106 1107

	sp = sctp_sk(sk);
	ep = sp->ep;

	/* connect() cannot be done on a socket that is already in ESTABLISHED
	 * state - UDP-style peeled off socket or a TCP-style socket that
	 * is already connected.
	 * It cannot be done even on a TCP-style listening socket.
	 */
1108
	if (sctp_sstate(sk, ESTABLISHED) || sctp_sstate(sk, CLOSING) ||
F
Frank Filz 已提交
1109 1110 1111 1112 1113 1114 1115 1116
	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
		err = -EISCONN;
		goto out_free;
	}

	/* Walk through the addrs buffer and count the number of addresses. */
	addr_buf = kaddrs;
	while (walk_size < addrs_size) {
1117 1118
		struct sctp_af *af;

1119 1120 1121 1122 1123
		if (walk_size + sizeof(sa_family_t) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

J
Joe Perches 已提交
1124
		sa_addr = addr_buf;
1125
		af = sctp_get_af_specific(sa_addr->sa.sa_family);
F
Frank Filz 已提交
1126 1127 1128 1129 1130 1131 1132 1133 1134

		/* If the address family is not supported or if this address
		 * causes the address buffer to overflow return EINVAL.
		 */
		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
			err = -EINVAL;
			goto out_free;
		}

1135 1136
		port = ntohs(sa_addr->v4.sin_port);

1137 1138 1139 1140
		/* Save current address so we can work with it */
		memcpy(&to, sa_addr, af->sockaddr_len);

		err = sctp_verify_addr(sk, &to, af->sockaddr_len);
F
Frank Filz 已提交
1141 1142 1143
		if (err)
			goto out_free;

1144 1145 1146
		/* Make sure the destination port is correctly set
		 * in all addresses.
		 */
1147 1148
		if (asoc && asoc->peer.port && asoc->peer.port != port) {
			err = -EINVAL;
1149
			goto out_free;
1150
		}
F
Frank Filz 已提交
1151 1152 1153 1154

		/* Check if there already is a matching association on the
		 * endpoint (other than the one created here).
		 */
1155
		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
F
Frank Filz 已提交
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167
		if (asoc2 && asoc2 != asoc) {
			if (asoc2->state >= SCTP_STATE_ESTABLISHED)
				err = -EISCONN;
			else
				err = -EALREADY;
			goto out_free;
		}

		/* If we could not find a matching association on the endpoint,
		 * make sure that there is no peeled-off association matching
		 * the peer address even on another socket.
		 */
1168
		if (sctp_endpoint_is_peeled_off(ep, &to)) {
F
Frank Filz 已提交
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
			err = -EADDRNOTAVAIL;
			goto out_free;
		}

		if (!asoc) {
			/* If a bind() or sctp_bindx() is not called prior to
			 * an sctp_connectx() call, the system picks an
			 * ephemeral port and will choose an address set
			 * equivalent to binding with a wildcard address.
			 */
			if (!ep->base.bind_addr.port) {
				if (sctp_autobind(sk)) {
					err = -EAGAIN;
					goto out_free;
				}
1184 1185
			} else {
				/*
1186 1187 1188 1189
				 * If an unprivileged user inherits a 1-many
				 * style socket with open associations on a
				 * privileged port, it MAY be permitted to
				 * accept new associations, but it SHOULD NOT
1190 1191
				 * be permitted to open new associations.
				 */
1192 1193 1194 1195
				if (ep->base.bind_addr.port <
				    inet_prot_sock(net) &&
				    !ns_capable(net->user_ns,
				    CAP_NET_BIND_SERVICE)) {
1196 1197 1198
					err = -EACCES;
					goto out_free;
				}
F
Frank Filz 已提交
1199 1200
			}

1201
			scope = sctp_scope(&to);
F
Frank Filz 已提交
1202 1203 1204 1205 1206
			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
			if (!asoc) {
				err = -ENOMEM;
				goto out_free;
			}
1207 1208 1209 1210 1211 1212 1213

			err = sctp_assoc_set_bind_addr_from_ep(asoc, scope,
							      GFP_KERNEL);
			if (err < 0) {
				goto out_free;
			}

F
Frank Filz 已提交
1214 1215 1216
		}

		/* Prime the peer's transport structures.  */
1217
		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
F
Frank Filz 已提交
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto out_free;
		}

		addrcnt++;
		addr_buf += af->sockaddr_len;
		walk_size += af->sockaddr_len;
	}

1229 1230 1231 1232 1233 1234 1235 1236 1237
	/* In case the user of sctp_connectx() wants an association
	 * id back, assign one now.
	 */
	if (assoc_id) {
		err = sctp_assoc_set_id(asoc, GFP_KERNEL);
		if (err < 0)
			goto out_free;
	}

1238
	err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
F
Frank Filz 已提交
1239 1240 1241 1242 1243
	if (err < 0) {
		goto out_free;
	}

	/* Initialize sk's dport and daddr for getpeername() */
E
Eric Dumazet 已提交
1244
	inet_sk(sk)->inet_dport = htons(asoc->peer.port);
1245
	sp->pf->to_sk_daddr(sa_addr, sk);
1246
	sk->sk_err = 0;
F
Frank Filz 已提交
1247

1248 1249 1250 1251 1252 1253 1254 1255
	/* in-kernel sockets don't generally have a file allocated to them
	 * if all they do is call sock_create_kern().
	 */
	if (sk->sk_socket->file)
		f_flags = sk->sk_socket->file->f_flags;

	timeo = sock_sndtimeo(sk, f_flags & O_NONBLOCK);

1256
	if (assoc_id)
1257
		*assoc_id = asoc->assoc_id;
1258 1259 1260 1261
	err = sctp_wait_for_connect(asoc, &timeo);
	/* Note: the asoc may be freed after the return of
	 * sctp_wait_for_connect.
	 */
F
Frank Filz 已提交
1262 1263 1264 1265 1266

	/* Don't free association on exit. */
	asoc = NULL;

out_free:
1267 1268
	pr_debug("%s: took out_free path with asoc:%p kaddrs:%p err:%d\n",
		 __func__, asoc, kaddrs, err);
F
Frank Filz 已提交
1269

1270 1271 1272 1273 1274
	if (asoc) {
		/* sctp_primitive_ASSOCIATE may have added this association
		 * To the hash table, try to unhash it, just in case, its a noop
		 * if it wasn't hashed so we're safe
		 */
F
Frank Filz 已提交
1275
		sctp_association_free(asoc);
1276
	}
F
Frank Filz 已提交
1277 1278 1279 1280 1281 1282
	return err;
}

/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
 *
 * API 8.9
1283 1284
 * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt,
 * 			sctp_assoc_t *asoc);
F
Frank Filz 已提交
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
 *
 * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
 * If the sd is an IPv6 socket, the addresses passed can either be IPv4
 * or IPv6 addresses.
 *
 * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
 * Section 3.1.2 for this usage.
 *
 * addrs is a pointer to an array of one or more socket addresses. Each
 * address is contained in its appropriate structure (i.e. struct
 * sockaddr_in or struct sockaddr_in6) the family of the address type
 * must be used to distengish the address length (note that this
 * representation is termed a "packed array" of addresses). The caller
 * specifies the number of addresses in the array with addrcnt.
 *
1300 1301 1302 1303
 * On success, sctp_connectx() returns 0. It also sets the assoc_id to
 * the association id of the new association.  On failure, sctp_connectx()
 * returns -1, and sets errno to the appropriate error code.  The assoc_id
 * is not touched by the kernel.
F
Frank Filz 已提交
1304 1305 1306 1307 1308 1309 1310 1311
 *
 * For SCTP, the port given in each socket address must be the same, or
 * sctp_connectx() will fail, setting errno to EINVAL.
 *
 * An application can use sctp_connectx to initiate an association with
 * an endpoint that is multi-homed.  Much like sctp_bindx() this call
 * allows a caller to specify multiple addresses at which a peer can be
 * reached.  The way the SCTP stack uses the list of addresses to set up
L
Lucas De Marchi 已提交
1312
 * the association is implementation dependent.  This function only
F
Frank Filz 已提交
1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
 * specifies that the stack will try to make use of all the addresses in
 * the list when needed.
 *
 * Note that the list of addresses passed in is only used for setting up
 * the association.  It does not necessarily equal the set of addresses
 * the peer uses for the resulting association.  If the caller wants to
 * find out the set of peer addresses, it must use sctp_getpaddrs() to
 * retrieve them after the association has been set up.
 *
 * Basically do nothing but copying the addresses from user to kernel
 * land and invoking either sctp_connectx(). This is used for tunneling
 * the sctp_connectx() request through sctp_setsockopt() from userspace.
 *
 * On exit there is no need to do sockfd_put(), sys_setsockopt() does
 * it.
 *
 * sk        The sk of the socket
 * addrs     The pointer to the addresses in user land
 * addrssize Size of the addrs buffer
 *
1333
 * Returns >=0 if ok, <0 errno code on error.
F
Frank Filz 已提交
1334
 */
1335
static int __sctp_setsockopt_connectx(struct sock *sk,
F
Frank Filz 已提交
1336
				      struct sockaddr __user *addrs,
1337 1338
				      int addrs_size,
				      sctp_assoc_t *assoc_id)
F
Frank Filz 已提交
1339 1340
{
	struct sockaddr *kaddrs;
1341
	int err = 0;
F
Frank Filz 已提交
1342

1343 1344
	pr_debug("%s: sk:%p addrs:%p addrs_size:%d\n",
		 __func__, sk, addrs, addrs_size);
F
Frank Filz 已提交
1345 1346 1347 1348

	if (unlikely(addrs_size <= 0))
		return -EINVAL;

1349 1350 1351
	kaddrs = vmemdup_user(addrs, addrs_size);
	if (unlikely(IS_ERR(kaddrs)))
		return PTR_ERR(kaddrs);
F
Frank Filz 已提交
1352

1353 1354
	err = __sctp_connect(sk, kaddrs, addrs_size, assoc_id);
	kvfree(kaddrs);
1355

F
Frank Filz 已提交
1356 1357 1358
	return err;
}

1359 1360 1361 1362
/*
 * This is an older interface.  It's kept for backward compatibility
 * to the option that doesn't provide association id.
 */
1363
static int sctp_setsockopt_connectx_old(struct sock *sk,
1364 1365
					struct sockaddr __user *addrs,
					int addrs_size)
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
{
	return __sctp_setsockopt_connectx(sk, addrs, addrs_size, NULL);
}

/*
 * New interface for the API.  The since the API is done with a socket
 * option, to make it simple we feed back the association id is as a return
 * indication to the call.  Error is always negative and association id is
 * always positive.
 */
1376
static int sctp_setsockopt_connectx(struct sock *sk,
1377 1378
				    struct sockaddr __user *addrs,
				    int addrs_size)
1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
{
	sctp_assoc_t assoc_id = 0;
	int err = 0;

	err = __sctp_setsockopt_connectx(sk, addrs, addrs_size, &assoc_id);

	if (err)
		return err;
	else
		return assoc_id;
}

1391
/*
1392 1393
 * New (hopefully final) interface for the API.
 * We use the sctp_getaddrs_old structure so that use-space library
1394
 * can avoid any unnecessary allocations. The only different part
1395
 * is that we store the actual length of the address buffer into the
1396
 * addrs_num structure member. That way we can re-use the existing
1397
 * code.
1398
 */
1399 1400 1401 1402 1403 1404 1405 1406
#ifdef CONFIG_COMPAT
struct compat_sctp_getaddrs_old {
	sctp_assoc_t	assoc_id;
	s32		addr_num;
	compat_uptr_t	addrs;		/* struct sockaddr * */
};
#endif

1407
static int sctp_getsockopt_connectx3(struct sock *sk, int len,
1408 1409
				     char __user *optval,
				     int __user *optlen)
1410
{
1411
	struct sctp_getaddrs_old param;
1412 1413 1414
	sctp_assoc_t assoc_id = 0;
	int err = 0;

1415
#ifdef CONFIG_COMPAT
1416
	if (in_compat_syscall()) {
1417
		struct compat_sctp_getaddrs_old param32;
1418

1419 1420 1421 1422
		if (len < sizeof(param32))
			return -EINVAL;
		if (copy_from_user(&param32, optval, sizeof(param32)))
			return -EFAULT;
1423

1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434
		param.assoc_id = param32.assoc_id;
		param.addr_num = param32.addr_num;
		param.addrs = compat_ptr(param32.addrs);
	} else
#endif
	{
		if (len < sizeof(param))
			return -EINVAL;
		if (copy_from_user(&param, optval, sizeof(param)))
			return -EFAULT;
	}
1435

1436 1437 1438
	err = __sctp_setsockopt_connectx(sk, (struct sockaddr __user *)
					 param.addrs, param.addr_num,
					 &assoc_id);
1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
	if (err == 0 || err == -EINPROGRESS) {
		if (copy_to_user(optval, &assoc_id, sizeof(assoc_id)))
			return -EFAULT;
		if (put_user(sizeof(assoc_id), optlen))
			return -EFAULT;
	}

	return err;
}

L
Linus Torvalds 已提交
1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498
/* API 3.1.4 close() - UDP Style Syntax
 * Applications use close() to perform graceful shutdown (as described in
 * Section 10.1 of [SCTP]) on ALL the associations currently represented
 * by a UDP-style socket.
 *
 * The syntax is
 *
 *   ret = close(int sd);
 *
 *   sd      - the socket descriptor of the associations to be closed.
 *
 * To gracefully shutdown a specific association represented by the
 * UDP-style socket, an application should use the sendmsg() call,
 * passing no user data, but including the appropriate flag in the
 * ancillary data (see Section xxxx).
 *
 * If sd in the close() call is a branched-off socket representing only
 * one association, the shutdown is performed on that association only.
 *
 * 4.1.6 close() - TCP Style Syntax
 *
 * Applications use close() to gracefully close down an association.
 *
 * The syntax is:
 *
 *    int close(int sd);
 *
 *      sd      - the socket descriptor of the association to be closed.
 *
 * After an application calls close() on a socket descriptor, no further
 * socket operations will succeed on that descriptor.
 *
 * API 7.1.4 SO_LINGER
 *
 * An application using the TCP-style socket can use this option to
 * perform the SCTP ABORT primitive.  The linger option structure is:
 *
 *  struct  linger {
 *     int     l_onoff;                // option on/off
 *     int     l_linger;               // linger time
 * };
 *
 * To enable the option, set l_onoff to 1.  If the l_linger value is set
 * to 0, calling close() is the same as the ABORT primitive.  If the
 * value is set to a negative value, the setsockopt() call will return
 * an error.  If the value is set to a positive value linger_time, the
 * close() can be blocked for at most linger_time ms.  If the graceful
 * shutdown phase does not finish during this period, close() will
 * return but the graceful shutdown phase continues in the system.
 */
1499
static void sctp_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
1500
{
1501
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
1502 1503 1504
	struct sctp_endpoint *ep;
	struct sctp_association *asoc;
	struct list_head *pos, *temp;
1505
	unsigned int data_was_unread;
L
Linus Torvalds 已提交
1506

1507
	pr_debug("%s: sk:%p, timeout:%ld\n", __func__, sk, timeout);
L
Linus Torvalds 已提交
1508

1509
	lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
L
Linus Torvalds 已提交
1510
	sk->sk_shutdown = SHUTDOWN_MASK;
1511
	inet_sk_set_state(sk, SCTP_SS_CLOSING);
L
Linus Torvalds 已提交
1512 1513 1514

	ep = sctp_sk(sk)->ep;

1515 1516 1517 1518
	/* Clean up any skbs sitting on the receive queue.  */
	data_was_unread = sctp_queue_purge_ulpevents(&sk->sk_receive_queue);
	data_was_unread += sctp_queue_purge_ulpevents(&sctp_sk(sk)->pd_lobby);

1519
	/* Walk all associations on an endpoint.  */
L
Linus Torvalds 已提交
1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
	list_for_each_safe(pos, temp, &ep->asocs) {
		asoc = list_entry(pos, struct sctp_association, asocs);

		if (sctp_style(sk, TCP)) {
			/* A closed association can still be in the list if
			 * it belongs to a TCP-style listening socket that is
			 * not yet accepted. If so, free it. If not, send an
			 * ABORT or SHUTDOWN based on the linger options.
			 */
			if (sctp_state(asoc, CLOSED)) {
				sctp_association_free(asoc);
1531 1532 1533
				continue;
			}
		}
L
Linus Torvalds 已提交
1534

1535 1536
		if (data_was_unread || !skb_queue_empty(&asoc->ulpq.lobby) ||
		    !skb_queue_empty(&asoc->ulpq.reasm) ||
1537
		    !skb_queue_empty(&asoc->ulpq.reasm_uo) ||
1538
		    (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime)) {
1539 1540 1541
			struct sctp_chunk *chunk;

			chunk = sctp_make_abort_user(asoc, NULL, 0);
1542
			sctp_primitive_ABORT(net, asoc, chunk);
1543
		} else
1544
			sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
1545 1546 1547 1548 1549 1550 1551
	}

	/* On a TCP-style socket, block for at most linger_time if set. */
	if (sctp_style(sk, TCP) && timeout)
		sctp_wait_for_close(sk, timeout);

	/* This will run the backlog queue.  */
1552
	release_sock(sk);
L
Linus Torvalds 已提交
1553 1554 1555

	/* Supposedly, no process has access to the socket, but
	 * the net layers still may.
1556 1557
	 * Also, sctp_destroy_sock() needs to be called with addr_wq_lock
	 * held and that should be grabbed before socket lock.
L
Linus Torvalds 已提交
1558
	 */
1559
	spin_lock_bh(&net->sctp.addr_wq_lock);
1560
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1561 1562 1563 1564 1565 1566 1567

	/* Hold the sock, since sk_common_release() will put sock_put()
	 * and we have just a little more cleanup.
	 */
	sock_hold(sk);
	sk_common_release(sk);

1568
	bh_unlock_sock(sk);
1569
	spin_unlock_bh(&net->sctp.addr_wq_lock);
L
Linus Torvalds 已提交
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608

	sock_put(sk);

	SCTP_DBG_OBJCNT_DEC(sock);
}

/* Handle EPIPE error. */
static int sctp_error(struct sock *sk, int flags, int err)
{
	if (err == -EPIPE)
		err = sock_error(sk) ? : -EPIPE;
	if (err == -EPIPE && !(flags & MSG_NOSIGNAL))
		send_sig(SIGPIPE, current, 0);
	return err;
}

/* API 3.1.3 sendmsg() - UDP Style Syntax
 *
 * An application uses sendmsg() and recvmsg() calls to transmit data to
 * and receive data from its peer.
 *
 *  ssize_t sendmsg(int socket, const struct msghdr *message,
 *                  int flags);
 *
 *  socket  - the socket descriptor of the endpoint.
 *  message - pointer to the msghdr structure which contains a single
 *            user message and possibly some ancillary data.
 *
 *            See Section 5 for complete description of the data
 *            structures.
 *
 *  flags   - flags sent or received with the user message, see Section
 *            5 for complete description of the flags.
 *
 * Note:  This function could use a rewrite especially when explicit
 * connect support comes in.
 */
/* BUG:  We do not implement the equivalent of sk_stream_wait_memory(). */

X
Xin Long 已提交
1609 1610
static int sctp_msghdr_parse(const struct msghdr *msg,
			     struct sctp_cmsgs *cmsgs);
L
Linus Torvalds 已提交
1611

1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
			      struct sctp_sndrcvinfo *srinfo,
			      const struct msghdr *msg, size_t msg_len)
{
	__u16 sflags;
	int err;

	if (sctp_sstate(sk, LISTENING) && sctp_style(sk, TCP))
		return -EPIPE;

	if (msg_len > sk->sk_sndbuf)
		return -EMSGSIZE;

	memset(cmsgs, 0, sizeof(*cmsgs));
	err = sctp_msghdr_parse(msg, cmsgs);
	if (err) {
		pr_debug("%s: msghdr parse err:%x\n", __func__, err);
		return err;
	}

	memset(srinfo, 0, sizeof(*srinfo));
	if (cmsgs->srinfo) {
		srinfo->sinfo_stream = cmsgs->srinfo->sinfo_stream;
		srinfo->sinfo_flags = cmsgs->srinfo->sinfo_flags;
		srinfo->sinfo_ppid = cmsgs->srinfo->sinfo_ppid;
		srinfo->sinfo_context = cmsgs->srinfo->sinfo_context;
		srinfo->sinfo_assoc_id = cmsgs->srinfo->sinfo_assoc_id;
		srinfo->sinfo_timetolive = cmsgs->srinfo->sinfo_timetolive;
	}

	if (cmsgs->sinfo) {
		srinfo->sinfo_stream = cmsgs->sinfo->snd_sid;
		srinfo->sinfo_flags = cmsgs->sinfo->snd_flags;
		srinfo->sinfo_ppid = cmsgs->sinfo->snd_ppid;
		srinfo->sinfo_context = cmsgs->sinfo->snd_context;
		srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
	}

1650 1651 1652 1653 1654 1655
	if (cmsgs->prinfo) {
		srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
		SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
				   cmsgs->prinfo->pr_policy);
	}

1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672
	sflags = srinfo->sinfo_flags;
	if (!sflags && msg_len)
		return 0;

	if (sctp_style(sk, TCP) && (sflags & (SCTP_EOF | SCTP_ABORT)))
		return -EINVAL;

	if (((sflags & SCTP_EOF) && msg_len > 0) ||
	    (!(sflags & (SCTP_EOF | SCTP_ABORT)) && msg_len == 0))
		return -EINVAL;

	if ((sflags & SCTP_ADDR_OVER) && !msg->msg_name)
		return -EINVAL;

	return 0;
}

1673 1674 1675 1676 1677 1678 1679 1680 1681
static int sctp_sendmsg_new_asoc(struct sock *sk, __u16 sflags,
				 struct sctp_cmsgs *cmsgs,
				 union sctp_addr *daddr,
				 struct sctp_transport **tp)
{
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
	struct net *net = sock_net(sk);
	struct sctp_association *asoc;
	enum sctp_scope scope;
1682
	struct cmsghdr *cmsg;
1683
	int err;
1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747

	*tp = NULL;

	if (sflags & (SCTP_EOF | SCTP_ABORT))
		return -EINVAL;

	if (sctp_style(sk, TCP) && (sctp_sstate(sk, ESTABLISHED) ||
				    sctp_sstate(sk, CLOSING)))
		return -EADDRNOTAVAIL;

	if (sctp_endpoint_is_peeled_off(ep, daddr))
		return -EADDRNOTAVAIL;

	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
	} else {
		if (ep->base.bind_addr.port < inet_prot_sock(net) &&
		    !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
			return -EACCES;
	}

	scope = sctp_scope(daddr);

	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
	if (!asoc)
		return -ENOMEM;

	if (sctp_assoc_set_bind_addr_from_ep(asoc, scope, GFP_KERNEL) < 0) {
		err = -ENOMEM;
		goto free;
	}

	if (cmsgs->init) {
		struct sctp_initmsg *init = cmsgs->init;

		if (init->sinit_num_ostreams) {
			__u16 outcnt = init->sinit_num_ostreams;

			asoc->c.sinit_num_ostreams = outcnt;
			/* outcnt has been changed, need to re-init stream */
			err = sctp_stream_init(&asoc->stream, outcnt, 0,
					       GFP_KERNEL);
			if (err)
				goto free;
		}

		if (init->sinit_max_instreams)
			asoc->c.sinit_max_instreams = init->sinit_max_instreams;

		if (init->sinit_max_attempts)
			asoc->max_init_attempts = init->sinit_max_attempts;

		if (init->sinit_max_init_timeo)
			asoc->max_init_timeo =
				msecs_to_jiffies(init->sinit_max_init_timeo);
	}

	*tp = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL, SCTP_UNKNOWN);
	if (!*tp) {
		err = -ENOMEM;
		goto free;
	}

1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
	if (!cmsgs->addrs_msg)
		return 0;

	/* sendv addr list parse */
	for_each_cmsghdr(cmsg, cmsgs->addrs_msg) {
		struct sctp_transport *transport;
		struct sctp_association *old;
		union sctp_addr _daddr;
		int dlen;

		if (cmsg->cmsg_level != IPPROTO_SCTP ||
		    (cmsg->cmsg_type != SCTP_DSTADDRV4 &&
		     cmsg->cmsg_type != SCTP_DSTADDRV6))
			continue;

		daddr = &_daddr;
		memset(daddr, 0, sizeof(*daddr));
		dlen = cmsg->cmsg_len - sizeof(struct cmsghdr);
		if (cmsg->cmsg_type == SCTP_DSTADDRV4) {
1767 1768
			if (dlen < sizeof(struct in_addr)) {
				err = -EINVAL;
1769
				goto free;
1770
			}
1771 1772 1773 1774 1775 1776

			dlen = sizeof(struct in_addr);
			daddr->v4.sin_family = AF_INET;
			daddr->v4.sin_port = htons(asoc->peer.port);
			memcpy(&daddr->v4.sin_addr, CMSG_DATA(cmsg), dlen);
		} else {
1777 1778
			if (dlen < sizeof(struct in6_addr)) {
				err = -EINVAL;
1779
				goto free;
1780
			}
1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812

			dlen = sizeof(struct in6_addr);
			daddr->v6.sin6_family = AF_INET6;
			daddr->v6.sin6_port = htons(asoc->peer.port);
			memcpy(&daddr->v6.sin6_addr, CMSG_DATA(cmsg), dlen);
		}
		err = sctp_verify_addr(sk, daddr, sizeof(*daddr));
		if (err)
			goto free;

		old = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
		if (old && old != asoc) {
			if (old->state >= SCTP_STATE_ESTABLISHED)
				err = -EISCONN;
			else
				err = -EALREADY;
			goto free;
		}

		if (sctp_endpoint_is_peeled_off(ep, daddr)) {
			err = -EADDRNOTAVAIL;
			goto free;
		}

		transport = sctp_assoc_add_peer(asoc, daddr, GFP_KERNEL,
						SCTP_UNKNOWN);
		if (!transport) {
			err = -ENOMEM;
			goto free;
		}
	}

1813 1814 1815 1816 1817 1818 1819
	return 0;

free:
	sctp_association_free(asoc);
	return err;
}

1820 1821 1822 1823 1824 1825 1826 1827 1828 1829
static int sctp_sendmsg_check_sflags(struct sctp_association *asoc,
				     __u16 sflags, struct msghdr *msg,
				     size_t msg_len)
{
	struct sock *sk = asoc->base.sk;
	struct net *net = sock_net(sk);

	if (sctp_state(asoc, CLOSED) && sctp_style(sk, TCP))
		return -EPIPE;

1830 1831 1832 1833
	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP) &&
	    !sctp_state(asoc, ESTABLISHED))
		return 0;

1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
	if (sflags & SCTP_EOF) {
		pr_debug("%s: shutting down association:%p\n", __func__, asoc);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);

		return 0;
	}

	if (sflags & SCTP_ABORT) {
		struct sctp_chunk *chunk;

		chunk = sctp_make_abort_user(asoc, msg, msg_len);
		if (!chunk)
			return -ENOMEM;

		pr_debug("%s: aborting association:%p\n", __func__, asoc);
		sctp_primitive_ABORT(net, asoc, chunk);

		return 0;
	}

	return 1;
}

1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
				struct msghdr *msg, size_t msg_len,
				struct sctp_transport *transport,
				struct sctp_sndrcvinfo *sinfo)
{
	struct sock *sk = asoc->base.sk;
	struct net *net = sock_net(sk);
	struct sctp_datamsg *datamsg;
	bool wait_connect = false;
	struct sctp_chunk *chunk;
	long timeo;
	int err;

	if (sinfo->sinfo_stream >= asoc->stream.outcnt) {
		err = -EINVAL;
		goto err;
	}

	if (unlikely(!asoc->stream.out[sinfo->sinfo_stream].ext)) {
		err = sctp_stream_init_ext(&asoc->stream, sinfo->sinfo_stream);
		if (err)
			goto err;
	}

	if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
		err = -EMSGSIZE;
		goto err;
	}

	if (sctp_state(asoc, CLOSED)) {
		err = sctp_primitive_ASSOCIATE(net, asoc, NULL);
		if (err)
			goto err;

		if (sctp_sk(sk)->strm_interleave) {
			timeo = sock_sndtimeo(sk, 0);
			err = sctp_wait_for_connect(asoc, &timeo);
			if (err)
				goto err;
		} else {
			wait_connect = true;
		}

		pr_debug("%s: we associated primitively\n", __func__);
	}

	if (asoc->pmtu_pending)
		sctp_assoc_pending_pmtu(asoc);

	if (sctp_wspace(asoc) < msg_len)
		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));

	if (!sctp_wspace(asoc)) {
		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
		err = sctp_wait_for_sndbuf(asoc, &timeo, msg_len);
		if (err)
			goto err;
	}

	datamsg = sctp_datamsg_from_user(asoc, sinfo, &msg->msg_iter);
	if (IS_ERR(datamsg)) {
		err = PTR_ERR(datamsg);
		goto err;
	}

	asoc->force_delay = !!(msg->msg_flags & MSG_MORE);

	list_for_each_entry(chunk, &datamsg->chunks, frag_list) {
		sctp_chunk_hold(chunk);
		sctp_set_owner_w(chunk);
		chunk->transport = transport;
	}

	err = sctp_primitive_SEND(net, asoc, datamsg);
	if (err) {
		sctp_datamsg_free(datamsg);
		goto err;
	}

	pr_debug("%s: we sent primitively\n", __func__);

	sctp_datamsg_put(datamsg);

	if (unlikely(wait_connect)) {
		timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
		sctp_wait_for_connect(asoc, &timeo);
	}

	err = msg_len;

err:
	return err;
}

1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973
static union sctp_addr *sctp_sendmsg_get_daddr(struct sock *sk,
					       const struct msghdr *msg,
					       struct sctp_cmsgs *cmsgs)
{
	union sctp_addr *daddr = NULL;
	int err;

	if (!sctp_style(sk, UDP_HIGH_BANDWIDTH) && msg->msg_name) {
		int len = msg->msg_namelen;

		if (len > sizeof(*daddr))
			len = sizeof(*daddr);

		daddr = (union sctp_addr *)msg->msg_name;

		err = sctp_verify_addr(sk, daddr, len);
		if (err)
			return ERR_PTR(err);
	}

	return daddr;
}

1974 1975 1976 1977 1978 1979 1980 1981 1982
static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
				      struct sctp_sndrcvinfo *sinfo,
				      struct sctp_cmsgs *cmsgs)
{
	if (!cmsgs->srinfo && !cmsgs->sinfo) {
		sinfo->sinfo_stream = asoc->default_stream;
		sinfo->sinfo_ppid = asoc->default_ppid;
		sinfo->sinfo_context = asoc->default_context;
		sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
1983 1984 1985

		if (!cmsgs->prinfo)
			sinfo->sinfo_flags = asoc->default_flags;
1986 1987
	}

1988
	if (!cmsgs->srinfo && !cmsgs->prinfo)
1989 1990 1991
		sinfo->sinfo_timetolive = asoc->default_timetolive;
}

1992
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
L
Linus Torvalds 已提交
1993
{
1994
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
1995
	struct sctp_transport *transport = NULL;
1996
	struct sctp_sndrcvinfo _sinfo, *sinfo;
1997 1998
	struct sctp_association *asoc;
	struct sctp_cmsgs cmsgs;
1999
	union sctp_addr *daddr;
2000 2001
	bool new = false;
	__u16 sflags;
2002
	int err;
L
Linus Torvalds 已提交
2003

2004 2005 2006
	/* Parse and get snd_info */
	err = sctp_sendmsg_parse(sk, &cmsgs, &_sinfo, msg, msg_len);
	if (err)
2007
		goto out;
L
Linus Torvalds 已提交
2008

2009
	sinfo  = &_sinfo;
2010
	sflags = sinfo->sinfo_flags;
L
Linus Torvalds 已提交
2011

2012 2013 2014 2015
	/* Get daddr from msg */
	daddr = sctp_sendmsg_get_daddr(sk, msg, &cmsgs);
	if (IS_ERR(daddr)) {
		err = PTR_ERR(daddr);
2016
		goto out;
L
Linus Torvalds 已提交
2017 2018
	}

2019
	lock_sock(sk);
L
Linus Torvalds 已提交
2020

2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
	/* SCTP_SENDALL process */
	if ((sflags & SCTP_SENDALL) && sctp_style(sk, UDP)) {
		list_for_each_entry(asoc, &ep->asocs, asocs) {
			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
							msg_len);
			if (err == 0)
				continue;
			if (err < 0)
				goto out_unlock;

			sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);

			err = sctp_sendmsg_to_asoc(asoc, msg, msg_len,
						   NULL, sinfo);
			if (err < 0)
				goto out_unlock;

			iov_iter_revert(&msg->msg_iter, err);
		}

		goto out_unlock;
	}

2044
	/* Get and check or create asoc */
2045 2046
	if (daddr) {
		asoc = sctp_endpoint_lookup_assoc(ep, daddr, &transport);
2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
		if (asoc) {
			err = sctp_sendmsg_check_sflags(asoc, sflags, msg,
							msg_len);
			if (err <= 0)
				goto out_unlock;
		} else {
			err = sctp_sendmsg_new_asoc(sk, sflags, &cmsgs, daddr,
						    &transport);
			if (err)
				goto out_unlock;

			asoc = transport->asoc;
			new = true;
		}

		if (!sctp_style(sk, TCP) && !(sflags & SCTP_ADDR_OVER))
			transport = NULL;
L
Linus Torvalds 已提交
2064
	} else {
2065
		asoc = sctp_id2assoc(sk, sinfo->sinfo_assoc_id);
L
Linus Torvalds 已提交
2066 2067 2068 2069 2070
		if (!asoc) {
			err = -EPIPE;
			goto out_unlock;
		}

2071
		err = sctp_sendmsg_check_sflags(asoc, sflags, msg, msg_len);
2072
		if (err <= 0)
L
Linus Torvalds 已提交
2073 2074 2075
			goto out_unlock;
	}

2076 2077
	/* Update snd_info with the asoc */
	sctp_sendmsg_update_sinfo(asoc, sinfo, &cmsgs);
L
Linus Torvalds 已提交
2078

2079
	/* Send msg to the asoc */
2080
	err = sctp_sendmsg_to_asoc(asoc, msg, msg_len, transport, sinfo);
2081
	if (err < 0 && err != -ESRCH && new)
L
Linus Torvalds 已提交
2082
		sctp_association_free(asoc);
2083

L
Linus Torvalds 已提交
2084
out_unlock:
2085
	release_sock(sk);
2086
out:
2087
	return sctp_error(sk, msg->msg_flags, err);
L
Linus Torvalds 已提交
2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109
}

/* This is an extended version of skb_pull() that removes the data from the
 * start of a skb even when data is spread across the list of skb's in the
 * frag_list. len specifies the total amount of data that needs to be removed.
 * when 'len' bytes could be removed from the skb, it returns 0.
 * If 'len' exceeds the total skb length,  it returns the no. of bytes that
 * could not be removed.
 */
static int sctp_skb_pull(struct sk_buff *skb, int len)
{
	struct sk_buff *list;
	int skb_len = skb_headlen(skb);
	int rlen;

	if (len <= skb_len) {
		__skb_pull(skb, len);
		return 0;
	}
	len -= skb_len;
	__skb_pull(skb, skb_len);

2110
	skb_walk_frags(skb, list) {
L
Linus Torvalds 已提交
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138
		rlen = sctp_skb_pull(list, len);
		skb->len -= (len-rlen);
		skb->data_len -= (len-rlen);

		if (!rlen)
			return 0;

		len = rlen;
	}

	return len;
}

/* API 3.1.3  recvmsg() - UDP Style Syntax
 *
 *  ssize_t recvmsg(int socket, struct msghdr *message,
 *                    int flags);
 *
 *  socket  - the socket descriptor of the endpoint.
 *  message - pointer to the msghdr structure which contains a single
 *            user message and possibly some ancillary data.
 *
 *            See Section 5 for complete description of the data
 *            structures.
 *
 *  flags   - flags sent or received with the user message, see Section
 *            5 for complete description of the flags.
 */
2139 2140
static int sctp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
			int noblock, int flags, int *addr_len)
L
Linus Torvalds 已提交
2141 2142 2143
{
	struct sctp_ulpevent *event = NULL;
	struct sctp_sock *sp = sctp_sk(sk);
2144
	struct sk_buff *skb, *head_skb;
L
Linus Torvalds 已提交
2145 2146 2147 2148
	int copied;
	int err = 0;
	int skb_len;

2149 2150 2151
	pr_debug("%s: sk:%p, msghdr:%p, len:%zd, noblock:%d, flags:0x%x, "
		 "addr_len:%p)\n", __func__, sk, msg, len, noblock, flags,
		 addr_len);
L
Linus Torvalds 已提交
2152

2153
	lock_sock(sk);
L
Linus Torvalds 已提交
2154

2155
	if (sctp_style(sk, TCP) && !sctp_sstate(sk, ESTABLISHED) &&
2156
	    !sctp_sstate(sk, CLOSING) && !sctp_sstate(sk, CLOSED)) {
L
Linus Torvalds 已提交
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
		err = -ENOTCONN;
		goto out;
	}

	skb = sctp_skb_recv_datagram(sk, flags, noblock, &err);
	if (!skb)
		goto out;

	/* Get the total length of the skb including any skb's in the
	 * frag_list.
	 */
	skb_len = skb->len;

	copied = skb_len;
	if (copied > len)
		copied = len;

2174
	err = skb_copy_datagram_msg(skb, 0, msg, copied);
L
Linus Torvalds 已提交
2175 2176 2177 2178 2179 2180

	event = sctp_skb2event(skb);

	if (err)
		goto out_free;

2181 2182 2183 2184 2185
	if (event->chunk && event->chunk->head_skb)
		head_skb = event->chunk->head_skb;
	else
		head_skb = skb;
	sock_recv_ts_and_drops(msg, sk, head_skb);
L
Linus Torvalds 已提交
2186 2187 2188 2189
	if (sctp_ulpevent_is_notification(event)) {
		msg->msg_flags |= MSG_NOTIFICATION;
		sp->pf->event_msgname(event, msg->msg_name, addr_len);
	} else {
2190
		sp->pf->skb_msgname(head_skb, msg->msg_name, addr_len);
L
Linus Torvalds 已提交
2191 2192
	}

2193 2194 2195
	/* Check if we allow SCTP_NXTINFO. */
	if (sp->recvnxtinfo)
		sctp_ulpevent_read_nxtinfo(event, msg, sk);
2196 2197 2198
	/* Check if we allow SCTP_RCVINFO. */
	if (sp->recvrcvinfo)
		sctp_ulpevent_read_rcvinfo(event, msg);
L
Linus Torvalds 已提交
2199 2200 2201
	/* Check if we allow SCTP_SNDRCVINFO. */
	if (sp->subscribe.sctp_data_io_event)
		sctp_ulpevent_read_sndrcvinfo(event, msg);
2202

L
Linus Torvalds 已提交
2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215
	err = copied;

	/* If skb's length exceeds the user's buffer, update the skb and
	 * push it back to the receive_queue so that the next call to
	 * recvmsg() will return the remaining data. Don't set MSG_EOR.
	 */
	if (skb_len > copied) {
		msg->msg_flags &= ~MSG_EOR;
		if (flags & MSG_PEEK)
			goto out_free;
		sctp_skb_pull(skb, copied);
		skb_queue_head(&sk->sk_receive_queue, skb);

2216 2217 2218 2219 2220 2221
		/* When only partial message is copied to the user, increase
		 * rwnd by that amount. If all the data in the skb is read,
		 * rwnd is updated when the event is freed.
		 */
		if (!sctp_ulpevent_is_notification(event))
			sctp_assoc_rwnd_increase(event->asoc, copied);
L
Linus Torvalds 已提交
2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
		goto out;
	} else if ((event->msg_flags & MSG_NOTIFICATION) ||
		   (event->msg_flags & MSG_EOR))
		msg->msg_flags |= MSG_EOR;
	else
		msg->msg_flags &= ~MSG_EOR;

out_free:
	if (flags & MSG_PEEK) {
		/* Release the skb reference acquired after peeking the skb in
		 * sctp_skb_recv_datagram().
		 */
		kfree_skb(skb);
	} else {
		/* Free the event which includes releasing the reference to
		 * the owner of the skb, freeing the skb and updating the
		 * rwnd.
		 */
		sctp_ulpevent_free(event);
	}
out:
2243
	release_sock(sk);
L
Linus Torvalds 已提交
2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254
	return err;
}

/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
 *
 * This option is a on/off flag.  If enabled no SCTP message
 * fragmentation will be performed.  Instead if a message being sent
 * exceeds the current PMTU size, the message will NOT be sent and
 * instead a error will be indicated to the user.
 */
static int sctp_setsockopt_disable_fragments(struct sock *sk,
2255 2256
					     char __user *optval,
					     unsigned int optlen)
L
Linus Torvalds 已提交
2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;

	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	sctp_sk(sk)->disable_fragments = (val == 0) ? 0 : 1;

	return 0;
}

static int sctp_setsockopt_events(struct sock *sk, char __user *optval,
2272
				  unsigned int optlen)
L
Linus Torvalds 已提交
2273
{
2274 2275 2276
	struct sctp_association *asoc;
	struct sctp_ulpevent *event;

2277
	if (optlen > sizeof(struct sctp_event_subscribe))
L
Linus Torvalds 已提交
2278 2279 2280
		return -EINVAL;
	if (copy_from_user(&sctp_sk(sk)->subscribe, optval, optlen))
		return -EFAULT;
2281

2282
	/* At the time when a user app subscribes to SCTP_SENDER_DRY_EVENT,
2283 2284 2285 2286 2287 2288 2289 2290 2291
	 * if there is no data to be sent or retransmit, the stack will
	 * immediately send up this notification.
	 */
	if (sctp_ulpevent_type_enabled(SCTP_SENDER_DRY_EVENT,
				       &sctp_sk(sk)->subscribe)) {
		asoc = sctp_id2assoc(sk, 0);

		if (asoc && sctp_outq_is_empty(&asoc->outqueue)) {
			event = sctp_ulpevent_make_sender_dry_event(asoc,
2292
					GFP_USER | __GFP_NOWARN);
2293 2294 2295
			if (!event)
				return -ENOMEM;

2296
			asoc->stream.si->enqueue_event(&asoc->ulpq, event);
2297 2298 2299
		}
	}

L
Linus Torvalds 已提交
2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314
	return 0;
}

/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
 *
 * This socket option is applicable to the UDP-style socket only.  When
 * set it will cause associations that are idle for more than the
 * specified number of seconds to automatically close.  An association
 * being idle is defined an association that has NOT sent or received
 * user data.  The special value of '0' indicates that no automatic
 * close of any associations should be performed.  The option expects an
 * integer defining the number of seconds of idle time before an
 * association is closed.
 */
static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
2315
				     unsigned int optlen)
L
Linus Torvalds 已提交
2316 2317
{
	struct sctp_sock *sp = sctp_sk(sk);
2318
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
2319 2320 2321 2322 2323 2324 2325 2326 2327

	/* Applicable to UDP-style socket only */
	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;
	if (optlen != sizeof(int))
		return -EINVAL;
	if (copy_from_user(&sp->autoclose, optval, optlen))
		return -EFAULT;

2328 2329 2330
	if (sp->autoclose > net->sctp.max_autoclose)
		sp->autoclose = net->sctp.max_autoclose;

L
Linus Torvalds 已提交
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343
	return 0;
}

/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
 *
 * Applications can enable or disable heartbeats for any peer address of
 * an association, modify an address's heartbeat interval, force a
 * heartbeat to be sent immediately, and adjust the address's maximum
 * number of retransmissions sent before an address is considered
 * unreachable.  The following structure is used to access and modify an
 * address's parameters:
 *
 *  struct sctp_paddrparams {
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355
 *     sctp_assoc_t            spp_assoc_id;
 *     struct sockaddr_storage spp_address;
 *     uint32_t                spp_hbinterval;
 *     uint16_t                spp_pathmaxrxt;
 *     uint32_t                spp_pathmtu;
 *     uint32_t                spp_sackdelay;
 *     uint32_t                spp_flags;
 * };
 *
 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
 *                     application, and identifies the association for
 *                     this query.
L
Linus Torvalds 已提交
2356 2357
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
2358 2359 2360
 *                     in milliseconds.  If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
L
Linus Torvalds 已提交
2361 2362
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
 *                     considered unreachable. If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
 *   spp_pathmtu     - When Path MTU discovery is disabled the value
 *                     specified here will be the "fixed" path mtu.
 *                     Note that if the spp_address field is empty
 *                     then all associations on this address will
 *                     have this fixed path mtu set upon them.
 *
 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
 *                     the number of milliseconds that sacks will be delayed
 *                     for. This value will apply to all addresses of an
 *                     association if the spp_address field is empty. Note
 *                     also, that if delayed sack is enabled and this
 *                     value is set to 0, no change is made to the last
 *                     recorded delayed sack timer value.
 *
 *   spp_flags       - These flags are used to control various features
 *                     on an association. The flag field may contain
 *                     zero or more of the following options.
 *
 *                     SPP_HB_ENABLE  - Enable heartbeats on the
 *                     specified address. Note that if the address
 *                     field is empty all addresses for the association
 *                     have heartbeats enabled upon them.
 *
 *                     SPP_HB_DISABLE - Disable heartbeats on the
 *                     speicifed address. Note that if the address
 *                     field is empty all addresses for the association
 *                     will have their heartbeats disabled. Note also
 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
 *                     mutually exclusive, only one of these two should
 *                     be specified. Enabling both fields will have
 *                     undetermined results.
 *
 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
 *                     to be made immediately.
 *
2401 2402 2403 2404
 *                     SPP_HB_TIME_IS_ZERO - Specify's that the time for
 *                     heartbeat delayis to be set to the value of 0
 *                     milliseconds.
 *
2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429
 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected.
 *
 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected. Not also that
 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
 *                     exclusive. Enabling both will have undetermined
 *                     results.
 *
 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
 *                     on delayed sack. The time specified in spp_sackdelay
 *                     is used to specify the sack delay for this address. Note
 *                     that if spp_address is empty then all addresses will
 *                     enable delayed sack and take on the sack delay
 *                     value specified in spp_sackdelay.
 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
 *                     off delayed sack. If the spp_address field is blank then
 *                     delayed sack is disabled for the entire association. Note
 *                     also that this field is mutually exclusive to
 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
 *                     results.
L
Linus Torvalds 已提交
2430
 */
A
Adrian Bunk 已提交
2431 2432 2433 2434 2435 2436 2437
static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
				       struct sctp_transport   *trans,
				       struct sctp_association *asoc,
				       struct sctp_sock        *sp,
				       int                      hb_change,
				       int                      pmtud_change,
				       int                      sackdelay_change)
2438 2439 2440 2441
{
	int error;

	if (params->spp_flags & SPP_HB_DEMAND && trans) {
2442 2443 2444
		struct net *net = sock_net(trans->asoc->base.sk);

		error = sctp_primitive_REQUESTHEARTBEAT(net, trans->asoc, trans);
2445 2446 2447 2448
		if (error)
			return error;
	}

2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
	/* Note that unless the spp_flag is set to SPP_HB_ENABLE the value of
	 * this field is ignored.  Note also that a value of zero indicates
	 * the current setting should be left unchanged.
	 */
	if (params->spp_flags & SPP_HB_ENABLE) {

		/* Re-zero the interval if the SPP_HB_TIME_IS_ZERO is
		 * set.  This lets us use 0 value when this flag
		 * is set.
		 */
		if (params->spp_flags & SPP_HB_TIME_IS_ZERO)
			params->spp_hbinterval = 0;

		if (params->spp_hbinterval ||
		    (params->spp_flags & SPP_HB_TIME_IS_ZERO)) {
			if (trans) {
				trans->hbinterval =
				    msecs_to_jiffies(params->spp_hbinterval);
			} else if (asoc) {
				asoc->hbinterval =
				    msecs_to_jiffies(params->spp_hbinterval);
			} else {
				sp->hbinterval = params->spp_hbinterval;
			}
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488
		}
	}

	if (hb_change) {
		if (trans) {
			trans->param_flags =
				(trans->param_flags & ~SPP_HB) | hb_change;
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_HB) | hb_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_HB) | hb_change;
		}
	}

2489 2490 2491 2492 2493 2494
	/* When Path MTU discovery is disabled the value specified here will
	 * be the "fixed" path mtu (i.e. the value of the spp_flags field must
	 * include the flag SPP_PMTUD_DISABLE for this field to have any
	 * effect).
	 */
	if ((params->spp_flags & SPP_PMTUD_DISABLE) && params->spp_pathmtu) {
2495 2496
		if (trans) {
			trans->pathmtu = params->spp_pathmtu;
2497
			sctp_assoc_sync_pmtu(asoc);
2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511
		} else if (asoc) {
			asoc->pathmtu = params->spp_pathmtu;
		} else {
			sp->pathmtu = params->spp_pathmtu;
		}
	}

	if (pmtud_change) {
		if (trans) {
			int update = (trans->param_flags & SPP_PMTUD_DISABLE) &&
				(params->spp_flags & SPP_PMTUD_ENABLE);
			trans->param_flags =
				(trans->param_flags & ~SPP_PMTUD) | pmtud_change;
			if (update) {
2512
				sctp_transport_pmtu(trans, sctp_opt2sk(sp));
2513
				sctp_assoc_sync_pmtu(asoc);
2514 2515 2516 2517 2518 2519 2520 2521 2522 2523
			}
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_PMTUD) | pmtud_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_PMTUD) | pmtud_change;
		}
	}

2524 2525 2526 2527 2528
	/* Note that unless the spp_flag is set to SPP_SACKDELAY_ENABLE the
	 * value of this field is ignored.  Note also that a value of zero
	 * indicates the current setting should be left unchanged.
	 */
	if ((params->spp_flags & SPP_SACKDELAY_ENABLE) && params->spp_sackdelay) {
2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
		if (trans) {
			trans->sackdelay =
				msecs_to_jiffies(params->spp_sackdelay);
		} else if (asoc) {
			asoc->sackdelay =
				msecs_to_jiffies(params->spp_sackdelay);
		} else {
			sp->sackdelay = params->spp_sackdelay;
		}
	}

	if (sackdelay_change) {
		if (trans) {
			trans->param_flags =
				(trans->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		} else if (asoc) {
			asoc->param_flags =
				(asoc->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		} else {
			sp->param_flags =
				(sp->param_flags & ~SPP_SACKDELAY) |
				sackdelay_change;
		}
	}

2556 2557
	/* Note that a value of zero indicates the current setting should be
	   left unchanged.
2558
	 */
2559
	if (params->spp_pathmaxrxt) {
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571
		if (trans) {
			trans->pathmaxrxt = params->spp_pathmaxrxt;
		} else if (asoc) {
			asoc->pathmaxrxt = params->spp_pathmaxrxt;
		} else {
			sp->pathmaxrxt = params->spp_pathmaxrxt;
		}
	}

	return 0;
}

L
Linus Torvalds 已提交
2572
static int sctp_setsockopt_peer_addr_params(struct sock *sk,
2573 2574
					    char __user *optval,
					    unsigned int optlen)
L
Linus Torvalds 已提交
2575
{
2576 2577 2578 2579
	struct sctp_paddrparams  params;
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
2580
	int error;
2581
	int hb_change, pmtud_change, sackdelay_change;
L
Linus Torvalds 已提交
2582 2583

	if (optlen != sizeof(struct sctp_paddrparams))
2584
		return -EINVAL;
2585

L
Linus Torvalds 已提交
2586 2587 2588
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

2589 2590 2591 2592 2593 2594 2595 2596 2597
	/* Validate flags and value parameters. */
	hb_change        = params.spp_flags & SPP_HB;
	pmtud_change     = params.spp_flags & SPP_PMTUD;
	sackdelay_change = params.spp_flags & SPP_SACKDELAY;

	if (hb_change        == SPP_HB ||
	    pmtud_change     == SPP_PMTUD ||
	    sackdelay_change == SPP_SACKDELAY ||
	    params.spp_sackdelay > 500 ||
2598 2599
	    (params.spp_pathmtu &&
	     params.spp_pathmtu < SCTP_DEFAULT_MINSEGMENT))
2600
		return -EINVAL;
L
Linus Torvalds 已提交
2601

2602 2603 2604
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
	 */
2605
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
2606 2607 2608
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans)
L
Linus Torvalds 已提交
2609 2610 2611
			return -EINVAL;
	}

2612 2613 2614 2615 2616 2617
	/* Get association, if assoc_id != 0 and the socket is a one
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
	 */
	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
	if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP))
L
Linus Torvalds 已提交
2618 2619
		return -EINVAL;

2620 2621
	/* Heartbeat demand can only be sent on a transport or
	 * association, but not a socket.
L
Linus Torvalds 已提交
2622
	 */
2623 2624 2625 2626 2627 2628 2629
	if (params.spp_flags & SPP_HB_DEMAND && !trans && !asoc)
		return -EINVAL;

	/* Process parameters. */
	error = sctp_apply_peer_addr_params(&params, trans, asoc, sp,
					    hb_change, pmtud_change,
					    sackdelay_change);
L
Linus Torvalds 已提交
2630

2631 2632 2633 2634 2635
	if (error)
		return error;

	/* If changes are for association, also apply parameters to each
	 * transport.
L
Linus Torvalds 已提交
2636
	 */
2637
	if (!trans && asoc) {
2638 2639
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2640 2641 2642 2643 2644
			sctp_apply_peer_addr_params(&params, trans, asoc, sp,
						    hb_change, pmtud_change,
						    sackdelay_change);
		}
	}
L
Linus Torvalds 已提交
2645 2646 2647 2648

	return 0;
}

2649 2650 2651 2652 2653 2654 2655 2656 2657 2658
static inline __u32 sctp_spp_sackdelay_enable(__u32 param_flags)
{
	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_ENABLE;
}

static inline __u32 sctp_spp_sackdelay_disable(__u32 param_flags)
{
	return (param_flags & ~SPP_SACKDELAY) | SPP_SACKDELAY_DISABLE;
}

2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692
/*
 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 *
 * This option will effect the way delayed acks are performed.  This
 * option allows you to get or set the delayed ack time, in
 * milliseconds.  It also allows changing the delayed ack frequency.
 * Changing the frequency to 1 disables the delayed sack algorithm.  If
 * the assoc_id is 0, then this sets or gets the endpoints default
 * values.  If the assoc_id field is non-zero, then the set or get
 * effects the specified association for the one to many model (the
 * assoc_id field is ignored by the one to one model).  Note that if
 * sack_delay or sack_freq are 0 when setting this option, then the
 * current values will remain unchanged.
 *
 * struct sctp_sack_info {
 *     sctp_assoc_t            sack_assoc_id;
 *     uint32_t                sack_delay;
 *     uint32_t                sack_freq;
 * };
 *
 * sack_assoc_id -  This parameter, indicates which association the user
 *    is performing an action upon.  Note that if this field's value is
 *    zero then the endpoints default value is changed (effecting future
 *    associations only).
 *
 * sack_delay -  This parameter contains the number of milliseconds that
 *    the user is requesting the delayed ACK timer be set to.  Note that
 *    this value is defined in the standard to be between 200 and 500
 *    milliseconds.
 *
 * sack_freq -  This parameter contains the number of packets that must
 *    be received before a sack is sent without waiting for the delay
 *    timer to expire.  The default value for this is 2, setting this
 *    value to 1 will disable the delayed sack algorithm.
2693 2694
 */

2695
static int sctp_setsockopt_delayed_ack(struct sock *sk,
2696
				       char __user *optval, unsigned int optlen)
2697
{
2698
	struct sctp_sack_info    params;
2699 2700 2701 2702
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

2703 2704 2705
	if (optlen == sizeof(struct sctp_sack_info)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
2706

2707 2708 2709
		if (params.sack_delay == 0 && params.sack_freq == 0)
			return 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
2710
		pr_warn_ratelimited(DEPRECATED
2711
				    "%s (pid %d) "
2712
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
2713 2714
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
2715 2716 2717 2718 2719 2720 2721 2722
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;

		if (params.sack_delay == 0)
			params.sack_freq = 1;
		else
			params.sack_freq = 0;
	} else
2723
		return -EINVAL;
2724 2725

	/* Validate value parameter. */
2726
	if (params.sack_delay > 500)
2727 2728
		return -EINVAL;

2729
	/* Get association, if sack_assoc_id != 0 and the socket is a one
2730 2731
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
2732
	 */
2733 2734
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
2735 2736
		return -EINVAL;

2737
	if (params.sack_delay) {
2738 2739
		if (asoc) {
			asoc->sackdelay =
2740
				msecs_to_jiffies(params.sack_delay);
2741
			asoc->param_flags =
2742
				sctp_spp_sackdelay_enable(asoc->param_flags);
2743
		} else {
2744
			sp->sackdelay = params.sack_delay;
2745
			sp->param_flags =
2746
				sctp_spp_sackdelay_enable(sp->param_flags);
2747
		}
2748 2749 2750
	}

	if (params.sack_freq == 1) {
2751
		if (asoc) {
2752
			asoc->param_flags =
2753
				sctp_spp_sackdelay_disable(asoc->param_flags);
2754
		} else {
2755
			sp->param_flags =
2756
				sctp_spp_sackdelay_disable(sp->param_flags);
2757
		}
2758 2759 2760 2761
	} else if (params.sack_freq > 1) {
		if (asoc) {
			asoc->sackfreq = params.sack_freq;
			asoc->param_flags =
2762
				sctp_spp_sackdelay_enable(asoc->param_flags);
2763 2764 2765
		} else {
			sp->sackfreq = params.sack_freq;
			sp->param_flags =
2766
				sctp_spp_sackdelay_enable(sp->param_flags);
2767
		}
2768 2769 2770 2771
	}

	/* If change is for association, also apply to each transport. */
	if (asoc) {
2772 2773
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				transports) {
2774
			if (params.sack_delay) {
2775
				trans->sackdelay =
2776
					msecs_to_jiffies(params.sack_delay);
2777
				trans->param_flags =
2778
					sctp_spp_sackdelay_enable(trans->param_flags);
2779
			}
2780
			if (params.sack_freq == 1) {
2781
				trans->param_flags =
2782
					sctp_spp_sackdelay_disable(trans->param_flags);
2783 2784 2785
			} else if (params.sack_freq > 1) {
				trans->sackfreq = params.sack_freq;
				trans->param_flags =
2786
					sctp_spp_sackdelay_enable(trans->param_flags);
2787 2788 2789
			}
		}
	}
2790

2791 2792 2793
	return 0;
}

L
Linus Torvalds 已提交
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
 *
 * Applications can specify protocol parameters for the default association
 * initialization.  The option name argument to setsockopt() and getsockopt()
 * is SCTP_INITMSG.
 *
 * Setting initialization parameters is effective only on an unconnected
 * socket (for UDP-style sockets only future associations are effected
 * by the change).  With TCP-style sockets, this option is inherited by
 * sockets derived from a listener socket.
 */
2805
static int sctp_setsockopt_initmsg(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815
{
	struct sctp_initmsg sinit;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen != sizeof(struct sctp_initmsg))
		return -EINVAL;
	if (copy_from_user(&sinit, optval, optlen))
		return -EFAULT;

	if (sinit.sinit_num_ostreams)
2816
		sp->initmsg.sinit_num_ostreams = sinit.sinit_num_ostreams;
L
Linus Torvalds 已提交
2817
	if (sinit.sinit_max_instreams)
2818
		sp->initmsg.sinit_max_instreams = sinit.sinit_max_instreams;
L
Linus Torvalds 已提交
2819
	if (sinit.sinit_max_attempts)
2820
		sp->initmsg.sinit_max_attempts = sinit.sinit_max_attempts;
L
Linus Torvalds 已提交
2821
	if (sinit.sinit_max_init_timeo)
2822
		sp->initmsg.sinit_max_init_timeo = sinit.sinit_max_init_timeo;
L
Linus Torvalds 已提交
2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841

	return 0;
}

/*
 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
 *
 *   Applications that wish to use the sendto() system call may wish to
 *   specify a default set of parameters that would normally be supplied
 *   through the inclusion of ancillary data.  This socket option allows
 *   such an application to set the default sctp_sndrcvinfo structure.
 *   The application that wishes to use this socket option simply passes
 *   in to this call the sctp_sndrcvinfo structure defined in Section
 *   5.2.2) The input parameters accepted by this call include
 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
 *   to this call if the caller is using the UDP model.
 */
static int sctp_setsockopt_default_send_param(struct sock *sk,
2842 2843
					      char __user *optval,
					      unsigned int optlen)
L
Linus Torvalds 已提交
2844 2845
{
	struct sctp_sock *sp = sctp_sk(sk);
2846 2847
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
2848

2849
	if (optlen != sizeof(info))
L
Linus Torvalds 已提交
2850 2851 2852
		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
2853 2854 2855 2856
	if (info.sinfo_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;
L
Linus Torvalds 已提交
2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877

	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		asoc->default_stream = info.sinfo_stream;
		asoc->default_flags = info.sinfo_flags;
		asoc->default_ppid = info.sinfo_ppid;
		asoc->default_context = info.sinfo_context;
		asoc->default_timetolive = info.sinfo_timetolive;
	} else {
		sp->default_stream = info.sinfo_stream;
		sp->default_flags = info.sinfo_flags;
		sp->default_ppid = info.sinfo_ppid;
		sp->default_context = info.sinfo_context;
		sp->default_timetolive = info.sinfo_timetolive;
	}

	return 0;
}

2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
 * (SCTP_DEFAULT_SNDINFO)
 */
static int sctp_setsockopt_default_sndinfo(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_sndinfo info;

	if (optlen != sizeof(info))
		return -EINVAL;
	if (copy_from_user(&info, optval, optlen))
		return -EFAULT;
	if (info.snd_flags &
	    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
	      SCTP_ABORT | SCTP_EOF))
		return -EINVAL;

	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		asoc->default_stream = info.snd_sid;
		asoc->default_flags = info.snd_flags;
		asoc->default_ppid = info.snd_ppid;
		asoc->default_context = info.snd_context;
	} else {
		sp->default_stream = info.snd_sid;
		sp->default_flags = info.snd_flags;
		sp->default_ppid = info.snd_ppid;
		sp->default_context = info.snd_context;
	}

	return 0;
}

L
Linus Torvalds 已提交
2916 2917 2918 2919 2920 2921 2922
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 *
 * Requests that the local SCTP stack use the enclosed peer address as
 * the association primary.  The enclosed address must be one of the
 * association peer's addresses.
 */
static int sctp_setsockopt_primary_addr(struct sock *sk, char __user *optval,
2923
					unsigned int optlen)
L
Linus Torvalds 已提交
2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951
{
	struct sctp_prim prim;
	struct sctp_transport *trans;

	if (optlen != sizeof(struct sctp_prim))
		return -EINVAL;

	if (copy_from_user(&prim, optval, sizeof(struct sctp_prim)))
		return -EFAULT;

	trans = sctp_addr_id2transport(sk, &prim.ssp_addr, prim.ssp_assoc_id);
	if (!trans)
		return -EINVAL;

	sctp_assoc_set_primary(trans->asoc, trans);

	return 0;
}

/*
 * 7.1.5 SCTP_NODELAY
 *
 * Turn on/off any Nagle-like algorithm.  This means that packets are
 * generally sent as soon as possible and no unnecessary delays are
 * introduced, at the cost of more packets in the network.  Expects an
 *  integer boolean flag.
 */
static int sctp_setsockopt_nodelay(struct sock *sk, char __user *optval,
2952
				   unsigned int optlen)
L
Linus Torvalds 已提交
2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

	sctp_sk(sk)->nodelay = (val == 0) ? 0 : 1;
	return 0;
}

/*
 *
 * 7.1.1 SCTP_RTOINFO
 *
 * The protocol parameters used to initialize and bound retransmission
 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
 * and modify these parameters.
 * All parameters are time values, in milliseconds.  A value of 0, when
 * modifying the parameters, indicates that the current value should not
 * be changed.
 *
 */
2977 2978
static int sctp_setsockopt_rtoinfo(struct sock *sk, char __user *optval, unsigned int optlen)
{
L
Linus Torvalds 已提交
2979 2980
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;
2981 2982
	unsigned long rto_min, rto_max;
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995

	if (optlen != sizeof (struct sctp_rtoinfo))
		return -EINVAL;

	if (copy_from_user(&rtoinfo, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);

	/* Set the values to the specific association */
	if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011
	rto_max = rtoinfo.srto_max;
	rto_min = rtoinfo.srto_min;

	if (rto_max)
		rto_max = asoc ? msecs_to_jiffies(rto_max) : rto_max;
	else
		rto_max = asoc ? asoc->rto_max : sp->rtoinfo.srto_max;

	if (rto_min)
		rto_min = asoc ? msecs_to_jiffies(rto_min) : rto_min;
	else
		rto_min = asoc ? asoc->rto_min : sp->rtoinfo.srto_min;

	if (rto_min > rto_max)
		return -EINVAL;

L
Linus Torvalds 已提交
3012 3013
	if (asoc) {
		if (rtoinfo.srto_initial != 0)
3014
			asoc->rto_initial =
L
Linus Torvalds 已提交
3015
				msecs_to_jiffies(rtoinfo.srto_initial);
3016 3017
		asoc->rto_max = rto_max;
		asoc->rto_min = rto_min;
L
Linus Torvalds 已提交
3018 3019 3020 3021 3022 3023
	} else {
		/* If there is no association or the association-id = 0
		 * set the values to the endpoint.
		 */
		if (rtoinfo.srto_initial != 0)
			sp->rtoinfo.srto_initial = rtoinfo.srto_initial;
3024 3025
		sp->rtoinfo.srto_max = rto_max;
		sp->rtoinfo.srto_min = rto_min;
L
Linus Torvalds 已提交
3026 3027 3028 3029 3030 3031 3032 3033 3034
	}

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
3035
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
3036 3037 3038 3039 3040 3041
 * of the association.
 * Returns an error if the new association retransmission value is
 * greater than the sum of the retransmission value  of the peer.
 * See [SCTP] for more information.
 *
 */
3042
static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
{

	struct sctp_assocparams assocparams;
	struct sctp_association *asoc;

	if (optlen != sizeof(struct sctp_assocparams))
		return -EINVAL;
	if (copy_from_user(&assocparams, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);

	if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Set the values to the specific association */
	if (asoc) {
3060 3061 3062 3063 3064
		if (assocparams.sasoc_asocmaxrxt != 0) {
			__u32 path_sum = 0;
			int   paths = 0;
			struct sctp_transport *peer_addr;

3065 3066
			list_for_each_entry(peer_addr, &asoc->peer.transport_addr_list,
					transports) {
3067 3068 3069 3070
				path_sum += peer_addr->pathmaxrxt;
				paths++;
			}

3071
			/* Only validate asocmaxrxt if we have more than
3072 3073 3074 3075 3076 3077 3078 3079
			 * one path/transport.  We do this because path
			 * retransmissions are only counted when we have more
			 * then one path.
			 */
			if (paths > 1 &&
			    assocparams.sasoc_asocmaxrxt > path_sum)
				return -EINVAL;

L
Linus Torvalds 已提交
3080
			asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
3081 3082
		}

3083 3084
		if (assocparams.sasoc_cookie_life != 0)
			asoc->cookie_life = ms_to_ktime(assocparams.sasoc_cookie_life);
L
Linus Torvalds 已提交
3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108
	} else {
		/* Set the values to the endpoint */
		struct sctp_sock *sp = sctp_sk(sk);

		if (assocparams.sasoc_asocmaxrxt != 0)
			sp->assocparams.sasoc_asocmaxrxt =
						assocparams.sasoc_asocmaxrxt;
		if (assocparams.sasoc_cookie_life != 0)
			sp->assocparams.sasoc_cookie_life =
						assocparams.sasoc_cookie_life;
	}
	return 0;
}

/*
 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
 *
 * This socket option is a boolean flag which turns on or off mapped V4
 * addresses.  If this option is turned on and the socket is type
 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
 * If this option is turned off, then no mapping will be done of V4
 * addresses and a user will receive both PF_INET6 and PF_INET type
 * addresses on the socket.
 */
3109
static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;
	if (val)
		sp->v4mapped = 1;
	else
		sp->v4mapped = 0;

	return 0;
}

/*
3127 3128 3129
 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
 * This option will get or set the maximum size to put in any outgoing
 * SCTP DATA chunk.  If a message is larger than this size it will be
L
Linus Torvalds 已提交
3130 3131 3132
 * fragmented by SCTP into the specified size.  Note that the underlying
 * SCTP implementation may fragment into smaller sized chunks when the
 * PMTU of the underlying association is smaller than the value set by
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151
 * the user.  The default value for this option is '0' which indicates
 * the user is NOT limiting fragmentation and only the PMTU will effect
 * SCTP's choice of DATA chunk size.  Note also that values set larger
 * than the maximum size of an IP datagram will effectively let SCTP
 * control fragmentation (i.e. the same as setting this option to 0).
 *
 * The following structure is used to access and modify this parameter:
 *
 * struct sctp_assoc_value {
 *   sctp_assoc_t assoc_id;
 *   uint32_t assoc_value;
 * };
 *
 * assoc_id:  This parameter is ignored for one-to-one style sockets.
 *    For one-to-many style sockets this parameter indicates which
 *    association the user is performing an action upon.  Note that if
 *    this field's value is zero then the endpoints default value is
 *    changed (effecting future associations only).
 * assoc_value:  This parameter specifies the maximum size in bytes.
L
Linus Torvalds 已提交
3152
 */
3153
static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
3154
{
3155
	struct sctp_sock *sp = sctp_sk(sk);
3156
	struct sctp_assoc_value params;
L
Linus Torvalds 已提交
3157 3158 3159
	struct sctp_association *asoc;
	int val;

3160
	if (optlen == sizeof(int)) {
3161
		pr_warn_ratelimited(DEPRECATED
3162
				    "%s (pid %d) "
3163
				    "Use of int in maxseg socket option.\n"
3164 3165
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3166 3167 3168 3169 3170 3171 3172
		if (copy_from_user(&val, optval, optlen))
			return -EFAULT;
		params.assoc_id = 0;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
		val = params.assoc_value;
3173
	} else {
L
Linus Torvalds 已提交
3174
		return -EINVAL;
3175
	}
3176

3177 3178
	if (val) {
		int min_len, max_len;
L
Linus Torvalds 已提交
3179

3180 3181 3182 3183 3184
		min_len = SCTP_DEFAULT_MINSEGMENT - sp->pf->af->net_header_len;
		min_len -= sizeof(struct sctphdr) +
			   sizeof(struct sctp_data_chunk);

		max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
3185

3186 3187 3188 3189 3190
		if (val < min_len || val > max_len)
			return -EINVAL;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
3191 3192
	if (asoc) {
		if (val == 0) {
3193
			val = asoc->pathmtu - sp->pf->af->net_header_len;
3194
			val -= sizeof(struct sctphdr) +
3195
			       sctp_datachk_len(&asoc->stream);
3196
		}
3197 3198
		asoc->user_frag = val;
		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
3199
	} else {
3200 3201
		if (params.assoc_id && sctp_style(sk, UDP))
			return -EINVAL;
3202
		sp->user_frag = val;
L
Linus Torvalds 已提交
3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217
	}

	return 0;
}


/*
 *  7.1.9 Set Peer Primary Address (SCTP_SET_PEER_PRIMARY_ADDR)
 *
 *   Requests that the peer mark the enclosed address as the association
 *   primary. The enclosed address must be one of the association's
 *   locally bound addresses. The following structure is used to make a
 *   set primary request:
 */
static int sctp_setsockopt_peer_primary_addr(struct sock *sk, char __user *optval,
3218
					     unsigned int optlen)
L
Linus Torvalds 已提交
3219
{
3220
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
3221 3222 3223 3224
	struct sctp_sock	*sp;
	struct sctp_association	*asoc = NULL;
	struct sctp_setpeerprim	prim;
	struct sctp_chunk	*chunk;
3225
	struct sctp_af		*af;
L
Linus Torvalds 已提交
3226 3227 3228 3229
	int 			err;

	sp = sctp_sk(sk);

3230
	if (!net->sctp.addip_enable)
L
Linus Torvalds 已提交
3231 3232 3233 3234 3235 3236 3237 3238 3239
		return -EPERM;

	if (optlen != sizeof(struct sctp_setpeerprim))
		return -EINVAL;

	if (copy_from_user(&prim, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, prim.sspp_assoc_id);
3240
	if (!asoc)
L
Linus Torvalds 已提交
3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251
		return -EINVAL;

	if (!asoc->peer.asconf_capable)
		return -EPERM;

	if (asoc->peer.addip_disabled_mask & SCTP_PARAM_SET_PRIMARY)
		return -EPERM;

	if (!sctp_state(asoc, ESTABLISHED))
		return -ENOTCONN;

3252 3253 3254 3255 3256 3257 3258
	af = sctp_get_af_specific(prim.sspp_addr.ss_family);
	if (!af)
		return -EINVAL;

	if (!af->addr_valid((union sctp_addr *)&prim.sspp_addr, sp, NULL))
		return -EADDRNOTAVAIL;

L
Linus Torvalds 已提交
3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
	if (!sctp_assoc_lookup_laddr(asoc, (union sctp_addr *)&prim.sspp_addr))
		return -EADDRNOTAVAIL;

	/* Create an ASCONF chunk with SET_PRIMARY parameter	*/
	chunk = sctp_make_asconf_set_prim(asoc,
					  (union sctp_addr *)&prim.sspp_addr);
	if (!chunk)
		return -ENOMEM;

	err = sctp_send_asconf(asoc, chunk);

3270
	pr_debug("%s: we set peer primary addr primitively\n", __func__);
L
Linus Torvalds 已提交
3271 3272 3273 3274

	return err;
}

3275
static int sctp_setsockopt_adaptation_layer(struct sock *sk, char __user *optval,
3276
					    unsigned int optlen)
L
Linus Torvalds 已提交
3277
{
3278
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
3279

3280
	if (optlen != sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
3281
		return -EINVAL;
3282
	if (copy_from_user(&adaptation, optval, optlen))
L
Linus Torvalds 已提交
3283 3284
		return -EFAULT;

3285
	sctp_sk(sk)->adaptation_ind = adaptation.ssb_adaptation_ind;
L
Linus Torvalds 已提交
3286 3287 3288 3289

	return 0;
}

3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304
/*
 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
 *
 * The context field in the sctp_sndrcvinfo structure is normally only
 * used when a failed message is retrieved holding the value that was
 * sent down on the actual send call.  This option allows the setting of
 * a default context on an association basis that will be received on
 * reading messages from the peer.  This is especially helpful in the
 * one-2-many model for an application to keep some reference to an
 * internal state machine that is processing messages on the
 * association.  Note that the setting of this value only effects
 * received messages from the peer and does not effect the value that is
 * saved with outbound messages.
 */
static int sctp_setsockopt_context(struct sock *sk, char __user *optval,
3305
				   unsigned int optlen)
3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329
{
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;

	if (optlen != sizeof(struct sctp_assoc_value))
		return -EINVAL;
	if (copy_from_user(&params, optval, optlen))
		return -EFAULT;

	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		asoc->default_rcv_context = params.assoc_value;
	} else {
		sp->default_rcv_context = params.assoc_value;
	}

	return 0;
}

3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355
/*
 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
 *
 * This options will at a minimum specify if the implementation is doing
 * fragmented interleave.  Fragmented interleave, for a one to many
 * socket, is when subsequent calls to receive a message may return
 * parts of messages from different associations.  Some implementations
 * may allow you to turn this value on or off.  If so, when turned off,
 * no fragment interleave will occur (which will cause a head of line
 * blocking amongst multiple associations sharing the same one to many
 * socket).  When this option is turned on, then each receive call may
 * come from a different association (thus the user must receive data
 * with the extended calls (e.g. sctp_recvmsg) to keep track of which
 * association each receive belongs to.
 *
 * This option takes a boolean value.  A non-zero value indicates that
 * fragmented interleave is on.  A value of zero indicates that
 * fragmented interleave is off.
 *
 * Note that it is important that an implementation that allows this
 * option to be turned on, have it off by default.  Otherwise an unaware
 * application using the one to many model may become confused and act
 * incorrectly.
 */
static int sctp_setsockopt_fragment_interleave(struct sock *sk,
					       char __user *optval,
3356
					       unsigned int optlen)
3357 3358 3359 3360 3361 3362 3363 3364
{
	int val;

	if (optlen != sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

3365 3366 3367 3368
	sctp_sk(sk)->frag_interleave = !!val;

	if (!sctp_sk(sk)->frag_interleave)
		sctp_sk(sk)->strm_interleave = 0;
3369 3370 3371 3372

	return 0;
}

3373
/*
3374
 * 8.1.21.  Set or Get the SCTP Partial Delivery Point
3375
 *       (SCTP_PARTIAL_DELIVERY_POINT)
3376
 *
3377 3378 3379
 * This option will set or get the SCTP partial delivery point.  This
 * point is the size of a message where the partial delivery API will be
 * invoked to help free up rwnd space for the peer.  Setting this to a
3380
 * lower value will cause partial deliveries to happen more often.  The
3381
 * calls argument is an integer that sets or gets the partial delivery
3382 3383 3384 3385 3386 3387 3388
 * point.  Note also that the call will fail if the user attempts to set
 * this value larger than the socket receive buffer size.
 *
 * Note that any single message having a length smaller than or equal to
 * the SCTP partial delivery point will be delivered in one single read
 * call as long as the user provided buffer is large enough to hold the
 * message.
3389 3390 3391
 */
static int sctp_setsockopt_partial_delivery_point(struct sock *sk,
						  char __user *optval,
3392
						  unsigned int optlen)
3393 3394 3395 3396 3397 3398 3399 3400
{
	u32 val;

	if (optlen != sizeof(u32))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;

3401 3402 3403 3404 3405 3406
	/* Note: We double the receive buffer from what the user sets
	 * it to be, also initial rwnd is based on rcvbuf/2.
	 */
	if (val > (sk->sk_rcvbuf >> 1))
		return -EINVAL;

3407 3408 3409 3410 3411
	sctp_sk(sk)->pd_point = val;

	return 0; /* is this the right error code? */
}

3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424
/*
 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
 *
 * This option will allow a user to change the maximum burst of packets
 * that can be emitted by this association.  Note that the default value
 * is 4, and some implementations may restrict this setting so that it
 * can only be lowered.
 *
 * NOTE: This text doesn't seem right.  Do this on a socket basis with
 * future associations inheriting the socket value.
 */
static int sctp_setsockopt_maxburst(struct sock *sk,
				    char __user *optval,
3425
				    unsigned int optlen)
3426
{
3427 3428 3429
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
3430
	int val;
3431
	int assoc_id = 0;
3432

3433
	if (optlen == sizeof(int)) {
3434
		pr_warn_ratelimited(DEPRECATED
3435
				    "%s (pid %d) "
3436
				    "Use of int in max_burst socket option deprecated.\n"
3437 3438
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
3439 3440 3441 3442 3443 3444 3445 3446
		if (copy_from_user(&val, optval, optlen))
			return -EFAULT;
	} else if (optlen == sizeof(struct sctp_assoc_value)) {
		if (copy_from_user(&params, optval, optlen))
			return -EFAULT;
		val = params.assoc_value;
		assoc_id = params.assoc_id;
	} else
3447 3448
		return -EINVAL;

3449 3450 3451 3452 3453 3454 3455 3456 3457
	sp = sctp_sk(sk);

	if (assoc_id != 0) {
		asoc = sctp_id2assoc(sk, assoc_id);
		if (!asoc)
			return -EINVAL;
		asoc->max_burst = val;
	} else
		sp->max_burst = val;
3458 3459 3460 3461

	return 0;
}

3462 3463 3464 3465 3466 3467 3468 3469
/*
 * 7.1.18.  Add a chunk that must be authenticated (SCTP_AUTH_CHUNK)
 *
 * This set option adds a chunk type that the user is requesting to be
 * received only in an authenticated way.  Changes to the list of chunks
 * will only effect future associations on the socket.
 */
static int sctp_setsockopt_auth_chunk(struct sock *sk,
3470 3471
				      char __user *optval,
				      unsigned int optlen)
3472
{
3473
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3474 3475
	struct sctp_authchunk val;

3476
	if (!ep->auth_enable)
3477 3478
		return -EACCES;

3479 3480 3481 3482 3483 3484
	if (optlen != sizeof(struct sctp_authchunk))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	switch (val.sauth_chunk) {
J
Joe Perches 已提交
3485 3486 3487 3488 3489
	case SCTP_CID_INIT:
	case SCTP_CID_INIT_ACK:
	case SCTP_CID_SHUTDOWN_COMPLETE:
	case SCTP_CID_AUTH:
		return -EINVAL;
3490 3491 3492
	}

	/* add this chunk id to the endpoint */
3493
	return sctp_auth_ep_add_chunkid(ep, val.sauth_chunk);
3494 3495 3496 3497 3498 3499 3500 3501 3502
}

/*
 * 7.1.19.  Get or set the list of supported HMAC Identifiers (SCTP_HMAC_IDENT)
 *
 * This option gets or sets the list of HMAC algorithms that the local
 * endpoint requires the peer to use.
 */
static int sctp_setsockopt_hmac_ident(struct sock *sk,
3503 3504
				      char __user *optval,
				      unsigned int optlen)
3505
{
3506
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3507
	struct sctp_hmacalgo *hmacs;
3508
	u32 idents;
3509 3510
	int err;

3511
	if (!ep->auth_enable)
3512 3513
		return -EACCES;

3514 3515
	if (optlen < sizeof(struct sctp_hmacalgo))
		return -EINVAL;
3516 3517
	optlen = min_t(unsigned int, optlen, sizeof(struct sctp_hmacalgo) +
					     SCTP_AUTH_NUM_HMACS * sizeof(u16));
3518

3519
	hmacs = memdup_user(optval, optlen);
3520 3521
	if (IS_ERR(hmacs))
		return PTR_ERR(hmacs);
3522

3523 3524 3525
	idents = hmacs->shmac_num_idents;
	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
3526 3527 3528 3529
		err = -EINVAL;
		goto out;
	}

3530
	err = sctp_auth_ep_set_hmacs(ep, hmacs);
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543
out:
	kfree(hmacs);
	return err;
}

/*
 * 7.1.20.  Set a shared key (SCTP_AUTH_KEY)
 *
 * This option will set a shared secret key which is used to build an
 * association shared key.
 */
static int sctp_setsockopt_auth_key(struct sock *sk,
				    char __user *optval,
3544
				    unsigned int optlen)
3545
{
3546
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3547 3548 3549 3550
	struct sctp_authkey *authkey;
	struct sctp_association *asoc;
	int ret;

3551
	if (!ep->auth_enable)
3552 3553
		return -EACCES;

3554 3555
	if (optlen <= sizeof(struct sctp_authkey))
		return -EINVAL;
3556 3557 3558 3559 3560
	/* authkey->sca_keylength is u16, so optlen can't be bigger than
	 * this.
	 */
	optlen = min_t(unsigned int, optlen, USHRT_MAX +
					     sizeof(struct sctp_authkey));
3561

3562
	authkey = memdup_user(optval, optlen);
3563 3564
	if (IS_ERR(authkey))
		return PTR_ERR(authkey);
3565

3566
	if (authkey->sca_keylength > optlen - sizeof(struct sctp_authkey)) {
3567 3568 3569 3570
		ret = -EINVAL;
		goto out;
	}

3571 3572 3573 3574 3575 3576
	asoc = sctp_id2assoc(sk, authkey->sca_assoc_id);
	if (!asoc && authkey->sca_assoc_id && sctp_style(sk, UDP)) {
		ret = -EINVAL;
		goto out;
	}

3577
	ret = sctp_auth_set_key(ep, asoc, authkey);
3578
out:
3579
	kzfree(authkey);
3580 3581 3582 3583 3584 3585 3586 3587 3588 3589
	return ret;
}

/*
 * 7.1.21.  Get or set the active shared key (SCTP_AUTH_ACTIVE_KEY)
 *
 * This option will get or set the active shared key to be used to build
 * the association shared key.
 */
static int sctp_setsockopt_active_key(struct sock *sk,
3590 3591
				      char __user *optval,
				      unsigned int optlen)
3592
{
3593
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3594 3595 3596
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3597
	if (!ep->auth_enable)
3598 3599
		return -EACCES;

3600 3601 3602 3603 3604 3605 3606 3607 3608
	if (optlen != sizeof(struct sctp_authkeyid))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

3609
	return sctp_auth_set_active_key(ep, asoc, val.scact_keynumber);
3610 3611 3612 3613 3614 3615 3616 3617
}

/*
 * 7.1.22.  Delete a shared key (SCTP_AUTH_DELETE_KEY)
 *
 * This set option will delete a shared secret key from use.
 */
static int sctp_setsockopt_del_key(struct sock *sk,
3618 3619
				   char __user *optval,
				   unsigned int optlen)
3620
{
3621
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
3622 3623 3624
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

3625
	if (!ep->auth_enable)
3626 3627
		return -EACCES;

3628 3629 3630 3631 3632 3633 3634 3635 3636
	if (optlen != sizeof(struct sctp_authkeyid))
		return -EINVAL;
	if (copy_from_user(&val, optval, optlen))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

3637
	return sctp_auth_del_key_id(ep, asoc, val.scact_keynumber);
3638 3639 3640

}

3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669
/*
 * 8.1.23 SCTP_AUTO_ASCONF
 *
 * This option will enable or disable the use of the automatic generation of
 * ASCONF chunks to add and delete addresses to an existing association.  Note
 * that this option has two caveats namely: a) it only affects sockets that
 * are bound to all addresses available to the SCTP stack, and b) the system
 * administrator may have an overriding control that turns the ASCONF feature
 * off no matter what setting the socket option may have.
 * This option expects an integer boolean flag, where a non-zero value turns on
 * the option, and a zero value turns off the option.
 * Note. In this implementation, socket operation overrides default parameter
 * being set by sysctl as well as FreeBSD implementation
 */
static int sctp_setsockopt_auto_asconf(struct sock *sk, char __user *optval,
					unsigned int optlen)
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *)optval))
		return -EFAULT;
	if (!sctp_is_ep_boundall(sk) && val)
		return -EINVAL;
	if ((val && sp->do_auto_asconf) || (!val && !sp->do_auto_asconf))
		return 0;

3670
	spin_lock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3671 3672 3673 3674 3675
	if (val == 0 && sp->do_auto_asconf) {
		list_del(&sp->auto_asconf_list);
		sp->do_auto_asconf = 0;
	} else if (val && !sp->do_auto_asconf) {
		list_add_tail(&sp->auto_asconf_list,
3676
		    &sock_net(sk)->sctp.auto_asconf_splist);
3677 3678
		sp->do_auto_asconf = 1;
	}
3679
	spin_unlock_bh(&sock_net(sk)->sctp.addr_wq_lock);
3680 3681 3682
	return 0;
}

3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732
/*
 * SCTP_PEER_ADDR_THLDS
 *
 * This option allows us to alter the partially failed threshold for one or all
 * transports in an association.  See Section 6.1 of:
 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
 */
static int sctp_setsockopt_paddr_thresholds(struct sock *sk,
					    char __user *optval,
					    unsigned int optlen)
{
	struct sctp_paddrthlds val;
	struct sctp_transport *trans;
	struct sctp_association *asoc;

	if (optlen < sizeof(struct sctp_paddrthlds))
		return -EINVAL;
	if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval,
			   sizeof(struct sctp_paddrthlds)))
		return -EFAULT;


	if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
		asoc = sctp_id2assoc(sk, val.spt_assoc_id);
		if (!asoc)
			return -ENOENT;
		list_for_each_entry(trans, &asoc->peer.transport_addr_list,
				    transports) {
			if (val.spt_pathmaxrxt)
				trans->pathmaxrxt = val.spt_pathmaxrxt;
			trans->pf_retrans = val.spt_pathpfthld;
		}

		if (val.spt_pathmaxrxt)
			asoc->pathmaxrxt = val.spt_pathmaxrxt;
		asoc->pf_retrans = val.spt_pathpfthld;
	} else {
		trans = sctp_addr_id2transport(sk, &val.spt_address,
					       val.spt_assoc_id);
		if (!trans)
			return -ENOENT;

		if (val.spt_pathmaxrxt)
			trans->pathmaxrxt = val.spt_pathmaxrxt;
		trans->pf_retrans = val.spt_pathpfthld;
	}

	return 0;
}

3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748
static int sctp_setsockopt_recvrcvinfo(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *) optval))
		return -EFAULT;

	sctp_sk(sk)->recvrcvinfo = (val == 0) ? 0 : 1;

	return 0;
}

3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764
static int sctp_setsockopt_recvnxtinfo(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	int val;

	if (optlen < sizeof(int))
		return -EINVAL;
	if (get_user(val, (int __user *) optval))
		return -EFAULT;

	sctp_sk(sk)->recvnxtinfo = (val == 0) ? 0 : 1;

	return 0;
}

3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797
static int sctp_setsockopt_pr_supported(struct sock *sk,
					char __user *optval,
					unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->prsctp_enable = !!params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->prsctp_enable = !!params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838
static int sctp_setsockopt_default_prinfo(struct sock *sk,
					  char __user *optval,
					  unsigned int optlen)
{
	struct sctp_default_prinfo info;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(info))
		goto out;

	if (copy_from_user(&info, optval, sizeof(info))) {
		retval = -EFAULT;
		goto out;
	}

	if (info.pr_policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	if (info.pr_policy == SCTP_PR_SCTP_NONE)
		info.pr_value = 0;

	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
	if (asoc) {
		SCTP_PR_SET_POLICY(asoc->default_flags, info.pr_policy);
		asoc->default_timetolive = info.pr_value;
	} else if (!info.pr_assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		SCTP_PR_SET_POLICY(sp->default_flags, info.pr_policy);
		sp->default_timetolive = info.pr_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871
static int sctp_setsockopt_reconfig_supported(struct sock *sk,
					      char __user *optval,
					      unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->reconf_enable = !!params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->reconf_enable = !!params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907
static int sctp_setsockopt_enable_strreset(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_value & (~SCTP_ENABLE_STRRESET_MASK))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		asoc->strreset_enable = params.assoc_value;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		sp->ep->strreset_enable = params.assoc_value;
	} else {
		goto out;
	}

	retval = 0;

out:
	return retval;
}

3908 3909 3910 3911 3912 3913 3914 3915
static int sctp_setsockopt_reset_streams(struct sock *sk,
					 char __user *optval,
					 unsigned int optlen)
{
	struct sctp_reset_streams *params;
	struct sctp_association *asoc;
	int retval = -EINVAL;

3916
	if (optlen < sizeof(*params))
3917
		return -EINVAL;
3918 3919 3920
	/* srs_number_streams is u16, so optlen can't be bigger than this. */
	optlen = min_t(unsigned int, optlen, USHRT_MAX +
					     sizeof(__u16) * sizeof(*params));
3921 3922 3923 3924 3925

	params = memdup_user(optval, optlen);
	if (IS_ERR(params))
		return PTR_ERR(params);

3926 3927 3928 3929
	if (params->srs_number_streams * sizeof(__u16) >
	    optlen - sizeof(*params))
		goto out;

3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940
	asoc = sctp_id2assoc(sk, params->srs_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_streams(asoc, params);

out:
	kfree(params);
	return retval;
}

3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966
static int sctp_setsockopt_reset_assoc(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	struct sctp_association *asoc;
	sctp_assoc_t associd;
	int retval = -EINVAL;

	if (optlen != sizeof(associd))
		goto out;

	if (copy_from_user(&associd, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, associd);
	if (!asoc)
		goto out;

	retval = sctp_send_reset_assoc(asoc);

out:
	return retval;
}

3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992
static int sctp_setsockopt_add_streams(struct sock *sk,
				       char __user *optval,
				       unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_add_streams params;
	int retval = -EINVAL;

	if (optlen != sizeof(params))
		goto out;

	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.sas_assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_send_add_streams(asoc, &params);

out:
	return retval;
}

3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022
static int sctp_setsockopt_scheduler(struct sock *sk,
				     char __user *optval,
				     unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_assoc_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_value > SCTP_SS_MAX)
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_sched_set_sched(asoc, params.assoc_value);

out:
	return retval;
}

4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
static int sctp_setsockopt_scheduler_value(struct sock *sk,
					   char __user *optval,
					   unsigned int optlen)
{
	struct sctp_association *asoc;
	struct sctp_stream_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc)
		goto out;

	retval = sctp_sched_set_value(asoc, params.stream_id,
				      params.stream_value, GFP_KERNEL);

out:
	return retval;
}

4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084
static int sctp_setsockopt_interleaving_supported(struct sock *sk,
						  char __user *optval,
						  unsigned int optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct net *net = sock_net(sk);
	struct sctp_assoc_value params;
	int retval = -EINVAL;

	if (optlen < sizeof(params))
		goto out;

	optlen = sizeof(params);
	if (copy_from_user(&params, optval, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (params.assoc_id)
		goto out;

	if (!net->sctp.intl_enable || !sp->frag_interleave) {
		retval = -EPERM;
		goto out;
	}

	sp->strm_interleave = !!params.assoc_value;

	retval = 0;

out:
	return retval;
}

L
Linus Torvalds 已提交
4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103
/* API 6.2 setsockopt(), getsockopt()
 *
 * Applications use setsockopt() and getsockopt() to set or retrieve
 * socket options.  Socket options are used to change the default
 * behavior of sockets calls.  They are described in Section 7.
 *
 * The syntax is:
 *
 *   ret = getsockopt(int sd, int level, int optname, void __user *optval,
 *                    int __user *optlen);
 *   ret = setsockopt(int sd, int level, int optname, const void __user *optval,
 *                    int optlen);
 *
 *   sd      - the socket descript.
 *   level   - set to IPPROTO_SCTP for all SCTP options.
 *   optname - the option name.
 *   optval  - the buffer to store the value of the option.
 *   optlen  - the size of the buffer.
 */
4104 4105
static int sctp_setsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
4106 4107 4108
{
	int retval = 0;

4109
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122

	/* I can hardly begin to describe how wrong this is.  This is
	 * so broken as to be worse than useless.  The API draft
	 * REALLY is NOT helpful here...  I am not convinced that the
	 * semantics of setsockopt() with a level OTHER THAN SOL_SCTP
	 * are at all well-founded.
	 */
	if (level != SOL_SCTP) {
		struct sctp_af *af = sctp_sk(sk)->pf->af;
		retval = af->setsockopt(sk, level, optname, optval, optlen);
		goto out_nounlock;
	}

4123
	lock_sock(sk);
L
Linus Torvalds 已提交
4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137

	switch (optname) {
	case SCTP_SOCKOPT_BINDX_ADD:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
					       optlen, SCTP_BINDX_ADD_ADDR);
		break;

	case SCTP_SOCKOPT_BINDX_REM:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_bindx(sk, (struct sockaddr __user *)optval,
					       optlen, SCTP_BINDX_REM_ADDR);
		break;

4138 4139 4140 4141 4142 4143 4144
	case SCTP_SOCKOPT_CONNECTX_OLD:
		/* 'optlen' is the size of the addresses buffer. */
		retval = sctp_setsockopt_connectx_old(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
		break;

F
Frank Filz 已提交
4145 4146
	case SCTP_SOCKOPT_CONNECTX:
		/* 'optlen' is the size of the addresses buffer. */
4147 4148 4149
		retval = sctp_setsockopt_connectx(sk,
					    (struct sockaddr __user *)optval,
					    optlen);
F
Frank Filz 已提交
4150 4151
		break;

L
Linus Torvalds 已提交
4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167
	case SCTP_DISABLE_FRAGMENTS:
		retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
		break;

	case SCTP_EVENTS:
		retval = sctp_setsockopt_events(sk, optval, optlen);
		break;

	case SCTP_AUTOCLOSE:
		retval = sctp_setsockopt_autoclose(sk, optval, optlen);
		break;

	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_setsockopt_peer_addr_params(sk, optval, optlen);
		break;

4168
	case SCTP_DELAYED_SACK:
4169
		retval = sctp_setsockopt_delayed_ack(sk, optval, optlen);
4170
		break;
4171 4172 4173
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_setsockopt_partial_delivery_point(sk, optval, optlen);
		break;
4174

L
Linus Torvalds 已提交
4175 4176 4177 4178 4179 4180 4181
	case SCTP_INITMSG:
		retval = sctp_setsockopt_initmsg(sk, optval, optlen);
		break;
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_setsockopt_default_send_param(sk, optval,
							    optlen);
		break;
4182 4183 4184
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_setsockopt_default_sndinfo(sk, optval, optlen);
		break;
L
Linus Torvalds 已提交
4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205
	case SCTP_PRIMARY_ADDR:
		retval = sctp_setsockopt_primary_addr(sk, optval, optlen);
		break;
	case SCTP_SET_PEER_PRIMARY_ADDR:
		retval = sctp_setsockopt_peer_primary_addr(sk, optval, optlen);
		break;
	case SCTP_NODELAY:
		retval = sctp_setsockopt_nodelay(sk, optval, optlen);
		break;
	case SCTP_RTOINFO:
		retval = sctp_setsockopt_rtoinfo(sk, optval, optlen);
		break;
	case SCTP_ASSOCINFO:
		retval = sctp_setsockopt_associnfo(sk, optval, optlen);
		break;
	case SCTP_I_WANT_MAPPED_V4_ADDR:
		retval = sctp_setsockopt_mappedv4(sk, optval, optlen);
		break;
	case SCTP_MAXSEG:
		retval = sctp_setsockopt_maxseg(sk, optval, optlen);
		break;
4206 4207
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_setsockopt_adaptation_layer(sk, optval, optlen);
L
Linus Torvalds 已提交
4208
		break;
4209 4210 4211
	case SCTP_CONTEXT:
		retval = sctp_setsockopt_context(sk, optval, optlen);
		break;
4212 4213 4214
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_setsockopt_fragment_interleave(sk, optval, optlen);
		break;
4215 4216 4217
	case SCTP_MAX_BURST:
		retval = sctp_setsockopt_maxburst(sk, optval, optlen);
		break;
4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232
	case SCTP_AUTH_CHUNK:
		retval = sctp_setsockopt_auth_chunk(sk, optval, optlen);
		break;
	case SCTP_HMAC_IDENT:
		retval = sctp_setsockopt_hmac_ident(sk, optval, optlen);
		break;
	case SCTP_AUTH_KEY:
		retval = sctp_setsockopt_auth_key(sk, optval, optlen);
		break;
	case SCTP_AUTH_ACTIVE_KEY:
		retval = sctp_setsockopt_active_key(sk, optval, optlen);
		break;
	case SCTP_AUTH_DELETE_KEY:
		retval = sctp_setsockopt_del_key(sk, optval, optlen);
		break;
4233 4234 4235
	case SCTP_AUTO_ASCONF:
		retval = sctp_setsockopt_auto_asconf(sk, optval, optlen);
		break;
4236 4237 4238
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_setsockopt_paddr_thresholds(sk, optval, optlen);
		break;
4239 4240 4241
	case SCTP_RECVRCVINFO:
		retval = sctp_setsockopt_recvrcvinfo(sk, optval, optlen);
		break;
4242 4243 4244
	case SCTP_RECVNXTINFO:
		retval = sctp_setsockopt_recvnxtinfo(sk, optval, optlen);
		break;
4245 4246 4247
	case SCTP_PR_SUPPORTED:
		retval = sctp_setsockopt_pr_supported(sk, optval, optlen);
		break;
4248 4249 4250
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_setsockopt_default_prinfo(sk, optval, optlen);
		break;
4251 4252 4253
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_setsockopt_reconfig_supported(sk, optval, optlen);
		break;
4254 4255 4256
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_setsockopt_enable_strreset(sk, optval, optlen);
		break;
4257 4258 4259
	case SCTP_RESET_STREAMS:
		retval = sctp_setsockopt_reset_streams(sk, optval, optlen);
		break;
4260 4261 4262
	case SCTP_RESET_ASSOC:
		retval = sctp_setsockopt_reset_assoc(sk, optval, optlen);
		break;
4263 4264 4265
	case SCTP_ADD_STREAMS:
		retval = sctp_setsockopt_add_streams(sk, optval, optlen);
		break;
4266 4267 4268
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_setsockopt_scheduler(sk, optval, optlen);
		break;
4269 4270 4271
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_setsockopt_scheduler_value(sk, optval, optlen);
		break;
4272 4273 4274 4275
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_setsockopt_interleaving_supported(sk, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
4276 4277 4278
	default:
		retval = -ENOPROTOOPT;
		break;
4279
	}
L
Linus Torvalds 已提交
4280

4281
	release_sock(sk);
L
Linus Torvalds 已提交
4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302

out_nounlock:
	return retval;
}

/* API 3.1.6 connect() - UDP Style Syntax
 *
 * An application may use the connect() call in the UDP model to initiate an
 * association without sending data.
 *
 * The syntax is:
 *
 * ret = connect(int sd, const struct sockaddr *nam, socklen_t len);
 *
 * sd: the socket descriptor to have a new association added to.
 *
 * nam: the address structure (either struct sockaddr_in or struct
 *    sockaddr_in6 defined in RFC2553 [7]).
 *
 * len: the size of the address.
 */
4303 4304
static int sctp_connect(struct sock *sk, struct sockaddr *addr,
			int addr_len)
L
Linus Torvalds 已提交
4305 4306
{
	int err = 0;
F
Frank Filz 已提交
4307
	struct sctp_af *af;
L
Linus Torvalds 已提交
4308

4309
	lock_sock(sk);
L
Linus Torvalds 已提交
4310

4311 4312
	pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk,
		 addr, addr_len);
L
Linus Torvalds 已提交
4313

F
Frank Filz 已提交
4314 4315 4316 4317 4318 4319 4320 4321
	/* Validate addr_len before calling common connect/connectx routine. */
	af = sctp_get_af_specific(addr->sa_family);
	if (!af || addr_len < af->sockaddr_len) {
		err = -EINVAL;
	} else {
		/* Pass correct addr len to common routine (so it knows there
		 * is only one address being passed.
		 */
4322
		err = __sctp_connect(sk, addr, af->sockaddr_len, NULL);
L
Linus Torvalds 已提交
4323 4324
	}

4325
	release_sock(sk);
L
Linus Torvalds 已提交
4326 4327 4328 4329
	return err;
}

/* FIXME: Write comments. */
4330
static int sctp_disconnect(struct sock *sk, int flags)
L
Linus Torvalds 已提交
4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341
{
	return -EOPNOTSUPP; /* STUB */
}

/* 4.1.4 accept() - TCP Style Syntax
 *
 * Applications use accept() call to remove an established SCTP
 * association from the accept queue of the endpoint.  A new socket
 * descriptor will be returned from accept() to represent the newly
 * formed association.
 */
4342
static struct sock *sctp_accept(struct sock *sk, int flags, int *err, bool kern)
L
Linus Torvalds 已提交
4343 4344 4345 4346 4347 4348 4349 4350
{
	struct sctp_sock *sp;
	struct sctp_endpoint *ep;
	struct sock *newsk = NULL;
	struct sctp_association *asoc;
	long timeo;
	int error = 0;

4351
	lock_sock(sk);
L
Linus Torvalds 已提交
4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365

	sp = sctp_sk(sk);
	ep = sp->ep;

	if (!sctp_style(sk, TCP)) {
		error = -EOPNOTSUPP;
		goto out;
	}

	if (!sctp_sstate(sk, LISTENING)) {
		error = -EINVAL;
		goto out;
	}

4366
	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
L
Linus Torvalds 已提交
4367 4368 4369 4370 4371 4372 4373 4374 4375 4376

	error = sctp_wait_for_accept(sk, timeo);
	if (error)
		goto out;

	/* We treat the list of associations on the endpoint as the accept
	 * queue and pick the first association on the list.
	 */
	asoc = list_entry(ep->asocs.next, struct sctp_association, asocs);

4377
	newsk = sp->pf->create_accept_sk(sk, asoc, kern);
L
Linus Torvalds 已提交
4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388
	if (!newsk) {
		error = -ENOMEM;
		goto out;
	}

	/* Populate the fields of the newsk from the oldsk and migrate the
	 * asoc to the newsk.
	 */
	sctp_sock_migrate(sk, newsk, asoc, SCTP_SOCKET_TCP);

out:
4389
	release_sock(sk);
4390
	*err = error;
L
Linus Torvalds 已提交
4391 4392 4393 4394
	return newsk;
}

/* The SCTP ioctl handler. */
4395
static int sctp_ioctl(struct sock *sk, int cmd, unsigned long arg)
L
Linus Torvalds 已提交
4396
{
4397 4398
	int rc = -ENOTCONN;

4399
	lock_sock(sk);
4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422

	/*
	 * SEQPACKET-style sockets in LISTENING state are valid, for
	 * SCTP, so only discard TCP-style sockets in LISTENING state.
	 */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
		goto out;

	switch (cmd) {
	case SIOCINQ: {
		struct sk_buff *skb;
		unsigned int amount = 0;

		skb = skb_peek(&sk->sk_receive_queue);
		if (skb != NULL) {
			/*
			 * We will only return the amount of this packet since
			 * that is all that will be read.
			 */
			amount = skb->len;
		}
		rc = put_user(amount, (int __user *)arg);
		break;
4423
	}
4424 4425 4426 4427 4428
	default:
		rc = -ENOIOCTLCMD;
		break;
	}
out:
4429
	release_sock(sk);
4430
	return rc;
L
Linus Torvalds 已提交
4431 4432 4433 4434 4435 4436
}

/* This is the function which gets called during socket creation to
 * initialized the SCTP-specific portion of the sock.
 * The sock structure should already be zero-filled memory.
 */
4437
static int sctp_init_sock(struct sock *sk)
L
Linus Torvalds 已提交
4438
{
4439
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4440 4441
	struct sctp_sock *sp;

4442
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457

	sp = sctp_sk(sk);

	/* Initialize the SCTP per socket area.  */
	switch (sk->sk_type) {
	case SOCK_SEQPACKET:
		sp->type = SCTP_SOCKET_UDP;
		break;
	case SOCK_STREAM:
		sp->type = SCTP_SOCKET_TCP;
		break;
	default:
		return -ESOCKTNOSUPPORT;
	}

M
Marcelo Ricardo Leitner 已提交
4458 4459
	sk->sk_gso_type = SKB_GSO_SCTP;

L
Linus Torvalds 已提交
4460 4461 4462 4463 4464 4465 4466 4467 4468
	/* Initialize default send parameters. These parameters can be
	 * modified with the SCTP_DEFAULT_SEND_PARAM socket option.
	 */
	sp->default_stream = 0;
	sp->default_ppid = 0;
	sp->default_flags = 0;
	sp->default_context = 0;
	sp->default_timetolive = 0;

4469
	sp->default_rcv_context = 0;
4470
	sp->max_burst = net->sctp.max_burst;
4471

4472 4473
	sp->sctp_hmac_alg = net->sctp.sctp_hmac_alg;

L
Linus Torvalds 已提交
4474 4475 4476 4477 4478 4479
	/* Initialize default setup parameters. These parameters
	 * can be modified with the SCTP_INITMSG socket option or
	 * overridden by the SCTP_INIT CMSG.
	 */
	sp->initmsg.sinit_num_ostreams   = sctp_max_outstreams;
	sp->initmsg.sinit_max_instreams  = sctp_max_instreams;
4480 4481
	sp->initmsg.sinit_max_attempts   = net->sctp.max_retrans_init;
	sp->initmsg.sinit_max_init_timeo = net->sctp.rto_max;
L
Linus Torvalds 已提交
4482 4483 4484 4485

	/* Initialize default RTO related parameters.  These parameters can
	 * be modified for with the SCTP_RTOINFO socket option.
	 */
4486 4487 4488
	sp->rtoinfo.srto_initial = net->sctp.rto_initial;
	sp->rtoinfo.srto_max     = net->sctp.rto_max;
	sp->rtoinfo.srto_min     = net->sctp.rto_min;
L
Linus Torvalds 已提交
4489 4490 4491 4492

	/* Initialize default association related parameters. These parameters
	 * can be modified with the SCTP_ASSOCINFO socket option.
	 */
4493
	sp->assocparams.sasoc_asocmaxrxt = net->sctp.max_retrans_association;
L
Linus Torvalds 已提交
4494 4495 4496
	sp->assocparams.sasoc_number_peer_destinations = 0;
	sp->assocparams.sasoc_peer_rwnd = 0;
	sp->assocparams.sasoc_local_rwnd = 0;
4497
	sp->assocparams.sasoc_cookie_life = net->sctp.valid_cookie_life;
L
Linus Torvalds 已提交
4498 4499

	/* Initialize default event subscriptions. By default, all the
4500
	 * options are off.
L
Linus Torvalds 已提交
4501 4502 4503 4504 4505 4506
	 */
	memset(&sp->subscribe, 0, sizeof(struct sctp_event_subscribe));

	/* Default Peer Address Parameters.  These defaults can
	 * be modified via SCTP_PEER_ADDR_PARAMS
	 */
4507 4508
	sp->hbinterval  = net->sctp.hb_interval;
	sp->pathmaxrxt  = net->sctp.max_retrans_path;
4509
	sp->pathmtu     = 0; /* allow default discovery */
4510
	sp->sackdelay   = net->sctp.sack_timeout;
4511
	sp->sackfreq	= 2;
4512
	sp->param_flags = SPP_HB_ENABLE |
4513 4514
			  SPP_PMTUD_ENABLE |
			  SPP_SACKDELAY_ENABLE;
L
Linus Torvalds 已提交
4515 4516 4517 4518 4519 4520

	/* If enabled no SCTP message fragmentation will be performed.
	 * Configure through SCTP_DISABLE_FRAGMENTS socket option.
	 */
	sp->disable_fragments = 0;

4521 4522
	/* Enable Nagle algorithm by default.  */
	sp->nodelay           = 0;
L
Linus Torvalds 已提交
4523

4524
	sp->recvrcvinfo = 0;
4525
	sp->recvnxtinfo = 0;
4526

L
Linus Torvalds 已提交
4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539
	/* Enable by default. */
	sp->v4mapped          = 1;

	/* Auto-close idle associations after the configured
	 * number of seconds.  A value of 0 disables this
	 * feature.  Configure through the SCTP_AUTOCLOSE socket option,
	 * for UDP-style sockets only.
	 */
	sp->autoclose         = 0;

	/* User specified fragmentation limit. */
	sp->user_frag         = 0;

4540
	sp->adaptation_ind = 0;
L
Linus Torvalds 已提交
4541 4542 4543 4544

	sp->pf = sctp_get_pf_specific(sk->sk_family);

	/* Control variables for partial data delivery. */
4545
	atomic_set(&sp->pd_mode, 0);
L
Linus Torvalds 已提交
4546
	skb_queue_head_init(&sp->pd_lobby);
4547
	sp->frag_interleave = 0;
L
Linus Torvalds 已提交
4548 4549 4550 4551 4552

	/* Create a per socket endpoint structure.  Even if we
	 * change the data structure relationships, this may still
	 * be useful for storing pre-connect address information.
	 */
4553 4554
	sp->ep = sctp_endpoint_new(sk, GFP_KERNEL);
	if (!sp->ep)
L
Linus Torvalds 已提交
4555 4556 4557 4558
		return -ENOMEM;

	sp->hmac = NULL;

4559 4560
	sk->sk_destruct = sctp_destruct_sock;

L
Linus Torvalds 已提交
4561
	SCTP_DBG_OBJCNT_INC(sock);
4562 4563

	local_bh_disable();
4564
	sk_sockets_allocated_inc(sk);
4565
	sock_prot_inuse_add(net, sk->sk_prot, 1);
4566 4567 4568 4569

	/* Nothing can fail after this block, otherwise
	 * sctp_destroy_sock() will be called without addr_wq_lock held
	 */
4570
	if (net->sctp.default_auto_asconf) {
4571
		spin_lock(&sock_net(sk)->sctp.addr_wq_lock);
4572
		list_add_tail(&sp->auto_asconf_list,
4573
		    &net->sctp.auto_asconf_splist);
4574
		sp->do_auto_asconf = 1;
4575 4576
		spin_unlock(&sock_net(sk)->sctp.addr_wq_lock);
	} else {
4577
		sp->do_auto_asconf = 0;
4578 4579
	}

4580 4581
	local_bh_enable();

L
Linus Torvalds 已提交
4582 4583 4584
	return 0;
}

4585 4586 4587
/* Cleanup any SCTP per socket resources. Must be called with
 * sock_net(sk)->sctp.addr_wq_lock held if sp->do_auto_asconf is true
 */
4588
static void sctp_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
4589
{
4590
	struct sctp_sock *sp;
L
Linus Torvalds 已提交
4591

4592
	pr_debug("%s: sk:%p\n", __func__, sk);
L
Linus Torvalds 已提交
4593 4594

	/* Release our hold on the endpoint. */
4595
	sp = sctp_sk(sk);
4596 4597 4598 4599 4600 4601
	/* This could happen during socket init, thus we bail out
	 * early, since the rest of the below is not setup either.
	 */
	if (sp->ep == NULL)
		return;

4602 4603 4604 4605 4606
	if (sp->do_auto_asconf) {
		sp->do_auto_asconf = 0;
		list_del(&sp->auto_asconf_list);
	}
	sctp_endpoint_free(sp->ep);
4607
	local_bh_disable();
4608
	sk_sockets_allocated_dec(sk);
4609
	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
4610
	local_bh_enable();
L
Linus Torvalds 已提交
4611 4612
}

4613 4614 4615 4616 4617 4618
/* Triggered when there are no references on the socket anymore */
static void sctp_destruct_sock(struct sock *sk)
{
	struct sctp_sock *sp = sctp_sk(sk);

	/* Free up the HMAC transform. */
H
Herbert Xu 已提交
4619
	crypto_free_shash(sp->hmac);
4620 4621 4622 4623

	inet_sock_destruct(sk);
}

L
Linus Torvalds 已提交
4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639
/* API 4.1.7 shutdown() - TCP Style Syntax
 *     int shutdown(int socket, int how);
 *
 *     sd      - the socket descriptor of the association to be closed.
 *     how     - Specifies the type of shutdown.  The  values  are
 *               as follows:
 *               SHUT_RD
 *                     Disables further receive operations. No SCTP
 *                     protocol action is taken.
 *               SHUT_WR
 *                     Disables further send operations, and initiates
 *                     the SCTP shutdown sequence.
 *               SHUT_RDWR
 *                     Disables further send  and  receive  operations
 *                     and initiates the SCTP shutdown sequence.
 */
4640
static void sctp_shutdown(struct sock *sk, int how)
L
Linus Torvalds 已提交
4641
{
4642
	struct net *net = sock_net(sk);
L
Linus Torvalds 已提交
4643 4644 4645 4646 4647
	struct sctp_endpoint *ep;

	if (!sctp_style(sk, TCP))
		return;

4648 4649 4650 4651
	ep = sctp_sk(sk)->ep;
	if (how & SEND_SHUTDOWN && !list_empty(&ep->asocs)) {
		struct sctp_association *asoc;

4652
		inet_sk_set_state(sk, SCTP_SS_CLOSING);
4653 4654 4655
		asoc = list_entry(ep->asocs.next,
				  struct sctp_association, asocs);
		sctp_primitive_SHUTDOWN(net, asoc, NULL);
L
Linus Torvalds 已提交
4656 4657 4658
	}
}

4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676
int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
		       struct sctp_info *info)
{
	struct sctp_transport *prim;
	struct list_head *pos;
	int mask;

	memset(info, 0, sizeof(*info));
	if (!asoc) {
		struct sctp_sock *sp = sctp_sk(sk);

		info->sctpi_s_autoclose = sp->autoclose;
		info->sctpi_s_adaptation_ind = sp->adaptation_ind;
		info->sctpi_s_pd_point = sp->pd_point;
		info->sctpi_s_nodelay = sp->nodelay;
		info->sctpi_s_disable_fragments = sp->disable_fragments;
		info->sctpi_s_v4mapped = sp->v4mapped;
		info->sctpi_s_frag_interleave = sp->frag_interleave;
4677
		info->sctpi_s_type = sp->type;
4678 4679 4680 4681 4682 4683 4684 4685 4686

		return 0;
	}

	info->sctpi_tag = asoc->c.my_vtag;
	info->sctpi_state = asoc->state;
	info->sctpi_rwnd = asoc->a_rwnd;
	info->sctpi_unackdata = asoc->unack_data;
	info->sctpi_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4687 4688
	info->sctpi_instrms = asoc->stream.incnt;
	info->sctpi_outstrms = asoc->stream.outcnt;
4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727
	list_for_each(pos, &asoc->base.inqueue.in_chunk_list)
		info->sctpi_inqueue++;
	list_for_each(pos, &asoc->outqueue.out_chunk_list)
		info->sctpi_outqueue++;
	info->sctpi_overall_error = asoc->overall_error_count;
	info->sctpi_max_burst = asoc->max_burst;
	info->sctpi_maxseg = asoc->frag_point;
	info->sctpi_peer_rwnd = asoc->peer.rwnd;
	info->sctpi_peer_tag = asoc->c.peer_vtag;

	mask = asoc->peer.ecn_capable << 1;
	mask = (mask | asoc->peer.ipv4_address) << 1;
	mask = (mask | asoc->peer.ipv6_address) << 1;
	mask = (mask | asoc->peer.hostname_address) << 1;
	mask = (mask | asoc->peer.asconf_capable) << 1;
	mask = (mask | asoc->peer.prsctp_capable) << 1;
	mask = (mask | asoc->peer.auth_capable);
	info->sctpi_peer_capable = mask;
	mask = asoc->peer.sack_needed << 1;
	mask = (mask | asoc->peer.sack_generation) << 1;
	mask = (mask | asoc->peer.zero_window_announced);
	info->sctpi_peer_sack = mask;

	info->sctpi_isacks = asoc->stats.isacks;
	info->sctpi_osacks = asoc->stats.osacks;
	info->sctpi_opackets = asoc->stats.opackets;
	info->sctpi_ipackets = asoc->stats.ipackets;
	info->sctpi_rtxchunks = asoc->stats.rtxchunks;
	info->sctpi_outofseqtsns = asoc->stats.outofseqtsns;
	info->sctpi_idupchunks = asoc->stats.idupchunks;
	info->sctpi_gapcnt = asoc->stats.gapcnt;
	info->sctpi_ouodchunks = asoc->stats.ouodchunks;
	info->sctpi_iuodchunks = asoc->stats.iuodchunks;
	info->sctpi_oodchunks = asoc->stats.oodchunks;
	info->sctpi_iodchunks = asoc->stats.iodchunks;
	info->sctpi_octrlchunks = asoc->stats.octrlchunks;
	info->sctpi_ictrlchunks = asoc->stats.ictrlchunks;

	prim = asoc->peer.primary_path;
4728
	memcpy(&info->sctpi_p_address, &prim->ipaddr, sizeof(prim->ipaddr));
4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744
	info->sctpi_p_state = prim->state;
	info->sctpi_p_cwnd = prim->cwnd;
	info->sctpi_p_srtt = prim->srtt;
	info->sctpi_p_rto = jiffies_to_msecs(prim->rto);
	info->sctpi_p_hbinterval = prim->hbinterval;
	info->sctpi_p_pathmaxrxt = prim->pathmaxrxt;
	info->sctpi_p_sackdelay = jiffies_to_msecs(prim->sackdelay);
	info->sctpi_p_ssthresh = prim->ssthresh;
	info->sctpi_p_partial_bytes_acked = prim->partial_bytes_acked;
	info->sctpi_p_flight_size = prim->flight_size;
	info->sctpi_p_error = prim->error_count;

	return 0;
}
EXPORT_SYMBOL_GPL(sctp_get_sctp_info);

4745
/* use callback to avoid exporting the core structure */
4746
void sctp_transport_walk_start(struct rhashtable_iter *iter)
4747
{
4748
	rhltable_walk_enter(&sctp_transport_hashtable, iter);
4749

4750
	rhashtable_walk_start(iter);
4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801
}

void sctp_transport_walk_stop(struct rhashtable_iter *iter)
{
	rhashtable_walk_stop(iter);
	rhashtable_walk_exit(iter);
}

struct sctp_transport *sctp_transport_get_next(struct net *net,
					       struct rhashtable_iter *iter)
{
	struct sctp_transport *t;

	t = rhashtable_walk_next(iter);
	for (; t; t = rhashtable_walk_next(iter)) {
		if (IS_ERR(t)) {
			if (PTR_ERR(t) == -EAGAIN)
				continue;
			break;
		}

		if (net_eq(sock_net(t->asoc->base.sk), net) &&
		    t->asoc->peer.primary_path == t)
			break;
	}

	return t;
}

struct sctp_transport *sctp_transport_get_idx(struct net *net,
					      struct rhashtable_iter *iter,
					      int pos)
{
	void *obj = SEQ_START_TOKEN;

	while (pos && (obj = sctp_transport_get_next(net, iter)) &&
	       !IS_ERR(obj))
		pos--;

	return obj;
}

int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
			   void *p) {
	int err = 0;
	int hash = 0;
	struct sctp_ep_common *epb;
	struct sctp_hashbucket *head;

	for (head = sctp_ep_hashtable; hash < sctp_ep_hashsize;
	     hash++, head++) {
4802
		read_lock_bh(&head->lock);
4803 4804 4805 4806 4807
		sctp_for_each_hentry(epb, &head->chain) {
			err = cb(sctp_ep(epb), p);
			if (err)
				break;
		}
4808
		read_unlock_bh(&head->lock);
4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820
	}

	return err;
}
EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);

int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
				  struct net *net,
				  const union sctp_addr *laddr,
				  const union sctp_addr *paddr, void *p)
{
	struct sctp_transport *transport;
4821
	int err;
4822 4823 4824

	rcu_read_lock();
	transport = sctp_addrs_lookup_transport(net, laddr, paddr);
4825
	rcu_read_unlock();
4826
	if (!transport)
4827
		return -ENOENT;
4828 4829

	err = cb(transport, p);
4830
	sctp_transport_put(transport);
4831

4832 4833 4834 4835 4836
	return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);

int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
4837 4838
			    int (*cb_done)(struct sctp_transport *, void *),
			    struct net *net, int *pos, void *p) {
4839
	struct rhashtable_iter hti;
4840 4841
	struct sctp_transport *tsp;
	int ret;
4842

4843
again:
4844
	ret = 0;
4845
	sctp_transport_walk_start(&hti);
4846

4847 4848 4849
	tsp = sctp_transport_get_idx(net, &hti, *pos + 1);
	for (; !IS_ERR_OR_NULL(tsp); tsp = sctp_transport_get_next(net, &hti)) {
		if (!sctp_transport_hold(tsp))
4850
			continue;
4851 4852
		ret = cb(tsp, p);
		if (ret)
4853
			break;
4854 4855
		(*pos)++;
		sctp_transport_put(tsp);
4856 4857
	}
	sctp_transport_walk_stop(&hti);
4858

4859 4860 4861 4862 4863 4864 4865 4866 4867 4868
	if (ret) {
		if (cb_done && !cb_done(tsp, p)) {
			(*pos)++;
			sctp_transport_put(tsp);
			goto again;
		}
		sctp_transport_put(tsp);
	}

	return ret;
4869 4870 4871
}
EXPORT_SYMBOL_GPL(sctp_for_each_transport);

L
Linus Torvalds 已提交
4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888
/* 7.2.1 Association Status (SCTP_STATUS)

 * Applications can retrieve current status information about an
 * association, including association state, peer receiver window size,
 * number of unacked data chunks, and number of data chunks pending
 * receipt.  This information is read-only.
 */
static int sctp_getsockopt_sctp_status(struct sock *sk, int len,
				       char __user *optval,
				       int __user *optlen)
{
	struct sctp_status status;
	struct sctp_association *asoc = NULL;
	struct sctp_transport *transport;
	sctp_assoc_t associd;
	int retval = 0;

4889
	if (len < sizeof(status)) {
L
Linus Torvalds 已提交
4890 4891 4892 4893
		retval = -EINVAL;
		goto out;
	}

4894 4895
	len = sizeof(status);
	if (copy_from_user(&status, optval, len)) {
L
Linus Torvalds 已提交
4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909
		retval = -EFAULT;
		goto out;
	}

	associd = status.sstat_assoc_id;
	asoc = sctp_id2assoc(sk, associd);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	transport = asoc->peer.primary_path;

	status.sstat_assoc_id = sctp_assoc2id(asoc);
4910
	status.sstat_state = sctp_assoc_to_state(asoc);
L
Linus Torvalds 已提交
4911 4912 4913 4914
	status.sstat_rwnd =  asoc->peer.rwnd;
	status.sstat_unackdata = asoc->unack_data;

	status.sstat_penddata = sctp_tsnmap_pending(&asoc->peer.tsn_map);
4915 4916
	status.sstat_instrms = asoc->stream.incnt;
	status.sstat_outstrms = asoc->stream.outcnt;
L
Linus Torvalds 已提交
4917 4918
	status.sstat_fragmentation_point = asoc->frag_point;
	status.sstat_primary.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
4919 4920
	memcpy(&status.sstat_primary.spinfo_address, &transport->ipaddr,
			transport->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
4921
	/* Map ipv4 address into v4-mapped-on-v6 address.  */
4922
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sctp_sk(sk),
L
Linus Torvalds 已提交
4923
		(union sctp_addr *)&status.sstat_primary.spinfo_address);
F
Frank Filz 已提交
4924
	status.sstat_primary.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4925 4926 4927
	status.sstat_primary.spinfo_cwnd = transport->cwnd;
	status.sstat_primary.spinfo_srtt = transport->srtt;
	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
4928
	status.sstat_primary.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4929

F
Frank Filz 已提交
4930 4931 4932
	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
		status.sstat_primary.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4933 4934 4935 4936 4937
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

4938 4939 4940
	pr_debug("%s: len:%d, state:%d, rwnd:%d, assoc_id:%d\n",
		 __func__, len, status.sstat_state, status.sstat_rwnd,
		 status.sstat_assoc_id);
L
Linus Torvalds 已提交
4941 4942 4943 4944 4945 4946 4947

	if (copy_to_user(optval, &status, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
E
Eric Dumazet 已提交
4948
	return retval;
L
Linus Torvalds 已提交
4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966
}


/* 7.2.2 Peer Address Information (SCTP_GET_PEER_ADDR_INFO)
 *
 * Applications can retrieve information about a specific peer address
 * of an association, including its reachability state, congestion
 * window, and retransmission timer values.  This information is
 * read-only.
 */
static int sctp_getsockopt_peer_addr_info(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_paddrinfo pinfo;
	struct sctp_transport *transport;
	int retval = 0;

4967
	if (len < sizeof(pinfo)) {
L
Linus Torvalds 已提交
4968 4969 4970 4971
		retval = -EINVAL;
		goto out;
	}

4972 4973
	len = sizeof(pinfo);
	if (copy_from_user(&pinfo, optval, len)) {
L
Linus Torvalds 已提交
4974 4975 4976 4977 4978 4979 4980 4981 4982 4983
		retval = -EFAULT;
		goto out;
	}

	transport = sctp_addr_id2transport(sk, &pinfo.spinfo_address,
					   pinfo.spinfo_assoc_id);
	if (!transport)
		return -EINVAL;

	pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
F
Frank Filz 已提交
4984
	pinfo.spinfo_state = transport->state;
L
Linus Torvalds 已提交
4985 4986 4987
	pinfo.spinfo_cwnd = transport->cwnd;
	pinfo.spinfo_srtt = transport->srtt;
	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
4988
	pinfo.spinfo_mtu = transport->pathmtu;
L
Linus Torvalds 已提交
4989

F
Frank Filz 已提交
4990 4991 4992
	if (pinfo.spinfo_state == SCTP_UNKNOWN)
		pinfo.spinfo_state = SCTP_ACTIVE;

L
Linus Torvalds 已提交
4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003
	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &pinfo, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
E
Eric Dumazet 已提交
5004
	return retval;
L
Linus Torvalds 已提交
5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038
}

/* 7.1.12 Enable/Disable message fragmentation (SCTP_DISABLE_FRAGMENTS)
 *
 * This option is a on/off flag.  If enabled no SCTP message
 * fragmentation will be performed.  Instead if a message being sent
 * exceeds the current PMTU size, the message will NOT be sent and
 * instead a error will be indicated to the user.
 */
static int sctp_getsockopt_disable_fragments(struct sock *sk, int len,
					char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = (sctp_sk(sk)->disable_fragments == 1);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

/* 7.1.15 Set notification and ancillary events (SCTP_EVENTS)
 *
 * This socket option is used to specify various notifications and
 * ancillary data the user wishes to receive.
 */
static int sctp_getsockopt_events(struct sock *sk, int len, char __user *optval,
				  int __user *optlen)
{
J
Jiri Slaby 已提交
5039
	if (len == 0)
L
Linus Torvalds 已提交
5040
		return -EINVAL;
5041 5042
	if (len > sizeof(struct sctp_event_subscribe))
		len = sizeof(struct sctp_event_subscribe);
5043 5044
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065
	if (copy_to_user(optval, &sctp_sk(sk)->subscribe, len))
		return -EFAULT;
	return 0;
}

/* 7.1.8 Automatic Close of associations (SCTP_AUTOCLOSE)
 *
 * This socket option is applicable to the UDP-style socket only.  When
 * set it will cause associations that are idle for more than the
 * specified number of seconds to automatically close.  An association
 * being idle is defined an association that has NOT sent or received
 * user data.  The special value of '0' indicates that no automatic
 * close of any associations should be performed.  The option expects an
 * integer defining the number of seconds of idle time before an
 * association is closed.
 */
static int sctp_getsockopt_autoclose(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	/* Applicable to UDP-style socket only */
	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;
5066
	if (len < sizeof(int))
L
Linus Torvalds 已提交
5067
		return -EINVAL;
5068 5069 5070
	len = sizeof(int);
	if (put_user(len, optlen))
		return -EFAULT;
5071
	if (put_user(sctp_sk(sk)->autoclose, (int __user *)optval))
L
Linus Torvalds 已提交
5072 5073 5074 5075 5076
		return -EFAULT;
	return 0;
}

/* Helper routine to branch off an association to a new socket.  */
B
Benjamin Poirier 已提交
5077
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
L
Linus Torvalds 已提交
5078
{
B
Benjamin Poirier 已提交
5079
	struct sctp_association *asoc = sctp_id2assoc(sk, id);
5080
	struct sctp_sock *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
5081 5082 5083
	struct socket *sock;
	int err = 0;

5084 5085 5086 5087
	/* Do not peel off from one netns to another one. */
	if (!net_eq(current->nsproxy->net_ns, sock_net(sk)))
		return -EINVAL;

B
Benjamin Poirier 已提交
5088 5089 5090
	if (!asoc)
		return -EINVAL;

L
Linus Torvalds 已提交
5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101
	/* An association cannot be branched off from an already peeled-off
	 * socket, nor is this supported for tcp style sockets.
	 */
	if (!sctp_style(sk, UDP))
		return -EINVAL;

	/* Create a new socket.  */
	err = sock_create(sk->sk_family, SOCK_SEQPACKET, IPPROTO_SCTP, &sock);
	if (err < 0)
		return err;

5102
	sctp_copy_sock(sock->sk, sk, asoc);
5103 5104 5105 5106

	/* Make peeled-off sockets more like 1-1 accepted sockets.
	 * Set the daddr and initialize id to something more random
	 */
5107
	sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
5108 5109 5110 5111 5112

	/* Populate the fields of the newsk from the oldsk and migrate the
	 * asoc to the newsk.
	 */
	sctp_sock_migrate(sk, sock->sk, asoc, SCTP_SOCKET_UDP_HIGH_BANDWIDTH);
5113

L
Linus Torvalds 已提交
5114 5115 5116 5117
	*sockp = sock;

	return err;
}
B
Benjamin Poirier 已提交
5118
EXPORT_SYMBOL(sctp_do_peeloff);
L
Linus Torvalds 已提交
5119

5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155
static int sctp_getsockopt_peeloff_common(struct sock *sk, sctp_peeloff_arg_t *peeloff,
					  struct file **newfile, unsigned flags)
{
	struct socket *newsock;
	int retval;

	retval = sctp_do_peeloff(sk, peeloff->associd, &newsock);
	if (retval < 0)
		goto out;

	/* Map the socket to an unused fd that can be returned to the user.  */
	retval = get_unused_fd_flags(flags & SOCK_CLOEXEC);
	if (retval < 0) {
		sock_release(newsock);
		goto out;
	}

	*newfile = sock_alloc_file(newsock, 0, NULL);
	if (IS_ERR(*newfile)) {
		put_unused_fd(retval);
		retval = PTR_ERR(*newfile);
		*newfile = NULL;
		return retval;
	}

	pr_debug("%s: sk:%p, newsk:%p, sd:%d\n", __func__, sk, newsock->sk,
		 retval);

	peeloff->sd = retval;

	if (flags & SOCK_NONBLOCK)
		(*newfile)->f_flags |= O_NONBLOCK;
out:
	return retval;
}

L
Linus Torvalds 已提交
5156 5157 5158
static int sctp_getsockopt_peeloff(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
	sctp_peeloff_arg_t peeloff;
5159
	struct file *newfile = NULL;
L
Linus Torvalds 已提交
5160 5161
	int retval = 0;

5162
	if (len < sizeof(sctp_peeloff_arg_t))
L
Linus Torvalds 已提交
5163
		return -EINVAL;
5164
	len = sizeof(sctp_peeloff_arg_t);
L
Linus Torvalds 已提交
5165 5166 5167
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

5168
	retval = sctp_getsockopt_peeloff_common(sk, &peeloff, &newfile, 0);
L
Linus Torvalds 已提交
5169 5170 5171
	if (retval < 0)
		goto out;

5172 5173 5174 5175 5176
	/* Return the fd mapped to the new socket.  */
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
L
Linus Torvalds 已提交
5177 5178
	}

5179 5180
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
5181
		put_unused_fd(retval);
5182
		return -EFAULT;
5183
	}
5184 5185 5186 5187
	fd_install(retval, newfile);
out:
	return retval;
}
5188

5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205
static int sctp_getsockopt_peeloff_flags(struct sock *sk, int len,
					 char __user *optval, int __user *optlen)
{
	sctp_peeloff_flags_arg_t peeloff;
	struct file *newfile = NULL;
	int retval = 0;

	if (len < sizeof(sctp_peeloff_flags_arg_t))
		return -EINVAL;
	len = sizeof(sctp_peeloff_flags_arg_t);
	if (copy_from_user(&peeloff, optval, len))
		return -EFAULT;

	retval = sctp_getsockopt_peeloff_common(sk, &peeloff.p_arg,
						&newfile, peeloff.flags);
	if (retval < 0)
		goto out;
L
Linus Torvalds 已提交
5206 5207

	/* Return the fd mapped to the new socket.  */
5208 5209 5210 5211 5212
	if (put_user(len, optlen)) {
		fput(newfile);
		put_unused_fd(retval);
		return -EFAULT;
	}
5213

5214 5215 5216
	if (copy_to_user(optval, &peeloff, len)) {
		fput(newfile);
		put_unused_fd(retval);
5217
		return -EFAULT;
5218 5219
	}
	fd_install(retval, newfile);
L
Linus Torvalds 已提交
5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233
out:
	return retval;
}

/* 7.1.13 Peer Address Parameters (SCTP_PEER_ADDR_PARAMS)
 *
 * Applications can enable or disable heartbeats for any peer address of
 * an association, modify an address's heartbeat interval, force a
 * heartbeat to be sent immediately, and adjust the address's maximum
 * number of retransmissions sent before an address is considered
 * unreachable.  The following structure is used to access and modify an
 * address's parameters:
 *
 *  struct sctp_paddrparams {
5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245
 *     sctp_assoc_t            spp_assoc_id;
 *     struct sockaddr_storage spp_address;
 *     uint32_t                spp_hbinterval;
 *     uint16_t                spp_pathmaxrxt;
 *     uint32_t                spp_pathmtu;
 *     uint32_t                spp_sackdelay;
 *     uint32_t                spp_flags;
 * };
 *
 *   spp_assoc_id    - (one-to-many style socket) This is filled in the
 *                     application, and identifies the association for
 *                     this query.
L
Linus Torvalds 已提交
5246 5247
 *   spp_address     - This specifies which address is of interest.
 *   spp_hbinterval  - This contains the value of the heartbeat interval,
5248 5249 5250
 *                     in milliseconds.  If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
L
Linus Torvalds 已提交
5251 5252
 *   spp_pathmaxrxt  - This contains the maximum number of
 *                     retransmissions before this address shall be
5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315
 *                     considered unreachable. If a  value of zero
 *                     is present in this field then no changes are to
 *                     be made to this parameter.
 *   spp_pathmtu     - When Path MTU discovery is disabled the value
 *                     specified here will be the "fixed" path mtu.
 *                     Note that if the spp_address field is empty
 *                     then all associations on this address will
 *                     have this fixed path mtu set upon them.
 *
 *   spp_sackdelay   - When delayed sack is enabled, this value specifies
 *                     the number of milliseconds that sacks will be delayed
 *                     for. This value will apply to all addresses of an
 *                     association if the spp_address field is empty. Note
 *                     also, that if delayed sack is enabled and this
 *                     value is set to 0, no change is made to the last
 *                     recorded delayed sack timer value.
 *
 *   spp_flags       - These flags are used to control various features
 *                     on an association. The flag field may contain
 *                     zero or more of the following options.
 *
 *                     SPP_HB_ENABLE  - Enable heartbeats on the
 *                     specified address. Note that if the address
 *                     field is empty all addresses for the association
 *                     have heartbeats enabled upon them.
 *
 *                     SPP_HB_DISABLE - Disable heartbeats on the
 *                     speicifed address. Note that if the address
 *                     field is empty all addresses for the association
 *                     will have their heartbeats disabled. Note also
 *                     that SPP_HB_ENABLE and SPP_HB_DISABLE are
 *                     mutually exclusive, only one of these two should
 *                     be specified. Enabling both fields will have
 *                     undetermined results.
 *
 *                     SPP_HB_DEMAND - Request a user initiated heartbeat
 *                     to be made immediately.
 *
 *                     SPP_PMTUD_ENABLE - This field will enable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected.
 *
 *                     SPP_PMTUD_DISABLE - This field will disable PMTU
 *                     discovery upon the specified address. Note that
 *                     if the address feild is empty then all addresses
 *                     on the association are effected. Not also that
 *                     SPP_PMTUD_ENABLE and SPP_PMTUD_DISABLE are mutually
 *                     exclusive. Enabling both will have undetermined
 *                     results.
 *
 *                     SPP_SACKDELAY_ENABLE - Setting this flag turns
 *                     on delayed sack. The time specified in spp_sackdelay
 *                     is used to specify the sack delay for this address. Note
 *                     that if spp_address is empty then all addresses will
 *                     enable delayed sack and take on the sack delay
 *                     value specified in spp_sackdelay.
 *                     SPP_SACKDELAY_DISABLE - Setting this flag turns
 *                     off delayed sack. If the spp_address field is blank then
 *                     delayed sack is disabled for the entire association. Note
 *                     also that this field is mutually exclusive to
 *                     SPP_SACKDELAY_ENABLE, setting both will have undefined
 *                     results.
L
Linus Torvalds 已提交
5316 5317
 */
static int sctp_getsockopt_peer_addr_params(struct sock *sk, int len,
5318
					    char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
5319
{
5320 5321 5322 5323
	struct sctp_paddrparams  params;
	struct sctp_transport   *trans = NULL;
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);
L
Linus Torvalds 已提交
5324

5325
	if (len < sizeof(struct sctp_paddrparams))
L
Linus Torvalds 已提交
5326
		return -EINVAL;
5327
	len = sizeof(struct sctp_paddrparams);
L
Linus Torvalds 已提交
5328 5329 5330
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

5331 5332
	/* If an address other than INADDR_ANY is specified, and
	 * no transport is found, then the request is invalid.
L
Linus Torvalds 已提交
5333
	 */
5334
	if (!sctp_is_any(sk, (union sctp_addr *)&params.spp_address)) {
5335 5336 5337
		trans = sctp_addr_id2transport(sk, &params.spp_address,
					       params.spp_assoc_id);
		if (!trans) {
5338
			pr_debug("%s: failed no transport\n", __func__);
5339 5340
			return -EINVAL;
		}
L
Linus Torvalds 已提交
5341 5342
	}

5343 5344 5345 5346 5347 5348
	/* Get association, if assoc_id != 0 and the socket is a one
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
	 */
	asoc = sctp_id2assoc(sk, params.spp_assoc_id);
	if (!asoc && params.spp_assoc_id && sctp_style(sk, UDP)) {
5349
		pr_debug("%s: failed no association\n", __func__);
L
Linus Torvalds 已提交
5350
		return -EINVAL;
5351
	}
L
Linus Torvalds 已提交
5352

5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376
	if (trans) {
		/* Fetch transport values. */
		params.spp_hbinterval = jiffies_to_msecs(trans->hbinterval);
		params.spp_pathmtu    = trans->pathmtu;
		params.spp_pathmaxrxt = trans->pathmaxrxt;
		params.spp_sackdelay  = jiffies_to_msecs(trans->sackdelay);

		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = trans->param_flags;
	} else if (asoc) {
		/* Fetch association values. */
		params.spp_hbinterval = jiffies_to_msecs(asoc->hbinterval);
		params.spp_pathmtu    = asoc->pathmtu;
		params.spp_pathmaxrxt = asoc->pathmaxrxt;
		params.spp_sackdelay  = jiffies_to_msecs(asoc->sackdelay);

		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = asoc->param_flags;
	} else {
		/* Fetch socket values. */
		params.spp_hbinterval = sp->hbinterval;
		params.spp_pathmtu    = sp->pathmtu;
		params.spp_sackdelay  = sp->sackdelay;
		params.spp_pathmaxrxt = sp->pathmaxrxt;
L
Linus Torvalds 已提交
5377

5378 5379 5380
		/*draft-11 doesn't say what to return in spp_flags*/
		params.spp_flags      = sp->param_flags;
	}
L
Linus Torvalds 已提交
5381 5382 5383 5384 5385 5386 5387 5388 5389 5390

	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	if (put_user(len, optlen))
		return -EFAULT;

	return 0;
}

5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409
/*
 * 7.1.23.  Get or set delayed ack timer (SCTP_DELAYED_SACK)
 *
 * This option will effect the way delayed acks are performed.  This
 * option allows you to get or set the delayed ack time, in
 * milliseconds.  It also allows changing the delayed ack frequency.
 * Changing the frequency to 1 disables the delayed sack algorithm.  If
 * the assoc_id is 0, then this sets or gets the endpoints default
 * values.  If the assoc_id field is non-zero, then the set or get
 * effects the specified association for the one to many model (the
 * assoc_id field is ignored by the one to one model).  Note that if
 * sack_delay or sack_freq are 0 when setting this option, then the
 * current values will remain unchanged.
 *
 * struct sctp_sack_info {
 *     sctp_assoc_t            sack_assoc_id;
 *     uint32_t                sack_delay;
 *     uint32_t                sack_freq;
 * };
5410
 *
5411 5412 5413 5414
 * sack_assoc_id -  This parameter, indicates which association the user
 *    is performing an action upon.  Note that if this field's value is
 *    zero then the endpoints default value is changed (effecting future
 *    associations only).
5415
 *
5416 5417 5418 5419
 * sack_delay -  This parameter contains the number of milliseconds that
 *    the user is requesting the delayed ACK timer be set to.  Note that
 *    this value is defined in the standard to be between 200 and 500
 *    milliseconds.
5420
 *
5421 5422 5423 5424
 * sack_freq -  This parameter contains the number of packets that must
 *    be received before a sack is sent without waiting for the delay
 *    timer to expire.  The default value for this is 2, setting this
 *    value to 1 will disable the delayed sack algorithm.
5425
 */
5426
static int sctp_getsockopt_delayed_ack(struct sock *sk, int len,
5427 5428 5429
					    char __user *optval,
					    int __user *optlen)
{
5430
	struct sctp_sack_info    params;
5431 5432 5433
	struct sctp_association *asoc = NULL;
	struct sctp_sock        *sp = sctp_sk(sk);

5434 5435
	if (len >= sizeof(struct sctp_sack_info)) {
		len = sizeof(struct sctp_sack_info);
5436

5437 5438 5439
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else if (len == sizeof(struct sctp_assoc_value)) {
5440
		pr_warn_ratelimited(DEPRECATED
5441
				    "%s (pid %d) "
5442
				    "Use of struct sctp_assoc_value in delayed_ack socket option.\n"
5443 5444
				    "Use struct sctp_sack_info instead\n",
				    current->comm, task_pid_nr(current));
5445 5446 5447
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
5448
		return -EINVAL;
5449

5450
	/* Get association, if sack_assoc_id != 0 and the socket is a one
5451 5452
	 * to many style socket, and an association was not found, then
	 * the id was invalid.
5453
	 */
5454 5455
	asoc = sctp_id2assoc(sk, params.sack_assoc_id);
	if (!asoc && params.sack_assoc_id && sctp_style(sk, UDP))
5456 5457 5458 5459
		return -EINVAL;

	if (asoc) {
		/* Fetch association values. */
5460 5461
		if (asoc->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay = jiffies_to_msecs(
5462
				asoc->sackdelay);
5463 5464 5465 5466 5467 5468
			params.sack_freq = asoc->sackfreq;

		} else {
			params.sack_delay = 0;
			params.sack_freq = 1;
		}
5469 5470
	} else {
		/* Fetch socket values. */
5471 5472 5473 5474 5475 5476 5477
		if (sp->param_flags & SPP_SACKDELAY_ENABLE) {
			params.sack_delay  = sp->sackdelay;
			params.sack_freq = sp->sackfreq;
		} else {
			params.sack_delay  = 0;
			params.sack_freq = 1;
		}
5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488
	}

	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	if (put_user(len, optlen))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
5489 5490 5491 5492 5493 5494 5495 5496 5497 5498 5499 5500 5501
/* 7.1.3 Initialization Parameters (SCTP_INITMSG)
 *
 * Applications can specify protocol parameters for the default association
 * initialization.  The option name argument to setsockopt() and getsockopt()
 * is SCTP_INITMSG.
 *
 * Setting initialization parameters is effective only on an unconnected
 * socket (for UDP-style sockets only future associations are effected
 * by the change).  With TCP-style sockets, this option is inherited by
 * sockets derived from a listener socket.
 */
static int sctp_getsockopt_initmsg(struct sock *sk, int len, char __user *optval, int __user *optlen)
{
5502
	if (len < sizeof(struct sctp_initmsg))
L
Linus Torvalds 已提交
5503
		return -EINVAL;
5504 5505 5506
	len = sizeof(struct sctp_initmsg);
	if (put_user(len, optlen))
		return -EFAULT;
L
Linus Torvalds 已提交
5507 5508 5509 5510 5511
	if (copy_to_user(optval, &sctp_sk(sk)->initmsg, len))
		return -EFAULT;
	return 0;
}

5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537

static int sctp_getsockopt_peer_addrs(struct sock *sk, int len,
				      char __user *optval, int __user *optlen)
{
	struct sctp_association *asoc;
	int cnt = 0;
	struct sctp_getaddrs getaddrs;
	struct sctp_transport *from;
	void __user *to;
	union sctp_addr temp;
	struct sctp_sock *sp = sctp_sk(sk);
	int addrlen;
	size_t space_left;
	int bytes_copied;

	if (len < sizeof(struct sctp_getaddrs))
		return -EINVAL;

	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
		return -EFAULT;

	/* For UDP-style sockets, id specifies the association to query.  */
	asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
	if (!asoc)
		return -EINVAL;

5538 5539
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5540

5541 5542
	list_for_each_entry(from, &asoc->peer.transport_addr_list,
				transports) {
5543
		memcpy(&temp, &from->ipaddr, sizeof(temp));
5544 5545
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5546
		if (space_left < addrlen)
5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558
			return -ENOMEM;
		if (copy_to_user(to, &temp, addrlen))
			return -EFAULT;
		to += addrlen;
		cnt++;
		space_left -= addrlen;
	}

	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num))
		return -EFAULT;
	bytes_copied = ((char __user *)to) - optval;
	if (put_user(bytes_copied, optlen))
L
Linus Torvalds 已提交
5559 5560 5561 5562 5563
		return -EFAULT;

	return 0;
}

5564 5565
static int sctp_copy_laddrs(struct sock *sk, __u16 port, void *to,
			    size_t space_left, int *bytes_copied)
5566 5567 5568 5569 5570
{
	struct sctp_sockaddr_entry *addr;
	union sctp_addr temp;
	int cnt = 0;
	int addrlen;
5571
	struct net *net = sock_net(sk);
5572

5573
	rcu_read_lock();
5574
	list_for_each_entry_rcu(addr, &net->sctp.local_addr_list, list) {
5575 5576 5577
		if (!addr->valid)
			continue;

5578
		if ((PF_INET == sk->sk_family) &&
5579
		    (AF_INET6 == addr->a.sa.sa_family))
5580
			continue;
5581 5582 5583 5584
		if ((PF_INET6 == sk->sk_family) &&
		    inet_v6_ipv6only(sk) &&
		    (AF_INET == addr->a.sa.sa_family))
			continue;
5585
		memcpy(&temp, &addr->a, sizeof(temp));
5586 5587 5588
		if (!temp.v4.sin_port)
			temp.v4.sin_port = htons(port);

5589 5590 5591
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sctp_sk(sk), &temp);

5592 5593 5594 5595
		if (space_left < addrlen) {
			cnt =  -ENOMEM;
			break;
		}
5596
		memcpy(to, &temp, addrlen);
5597

5598
		to += addrlen;
5599
		cnt++;
5600
		space_left -= addrlen;
5601
		*bytes_copied += addrlen;
5602
	}
5603
	rcu_read_unlock();
5604 5605 5606 5607

	return cnt;
}

L
Linus Torvalds 已提交
5608

5609 5610 5611 5612 5613 5614 5615 5616 5617 5618 5619 5620 5621 5622
static int sctp_getsockopt_local_addrs(struct sock *sk, int len,
				       char __user *optval, int __user *optlen)
{
	struct sctp_bind_addr *bp;
	struct sctp_association *asoc;
	int cnt = 0;
	struct sctp_getaddrs getaddrs;
	struct sctp_sockaddr_entry *addr;
	void __user *to;
	union sctp_addr temp;
	struct sctp_sock *sp = sctp_sk(sk);
	int addrlen;
	int err = 0;
	size_t space_left;
5623 5624
	int bytes_copied = 0;
	void *addrs;
5625
	void *buf;
5626

5627
	if (len < sizeof(struct sctp_getaddrs))
5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647
		return -EINVAL;

	if (copy_from_user(&getaddrs, optval, sizeof(struct sctp_getaddrs)))
		return -EFAULT;

	/*
	 *  For UDP-style sockets, id specifies the association to query.
	 *  If the id field is set to the value '0' then the locally bound
	 *  addresses are returned without regard to any particular
	 *  association.
	 */
	if (0 == getaddrs.assoc_id) {
		bp = &sctp_sk(sk)->ep->base.bind_addr;
	} else {
		asoc = sctp_id2assoc(sk, getaddrs.assoc_id);
		if (!asoc)
			return -EINVAL;
		bp = &asoc->base.bind_addr;
	}

5648 5649
	to = optval + offsetof(struct sctp_getaddrs, addrs);
	space_left = len - offsetof(struct sctp_getaddrs, addrs);
5650

5651
	addrs = kmalloc(space_left, GFP_USER | __GFP_NOWARN);
5652 5653
	if (!addrs)
		return -ENOMEM;
5654 5655 5656 5657 5658 5659 5660

	/* If the endpoint is bound to 0.0.0.0 or ::0, get the valid
	 * addresses from the global local address list.
	 */
	if (sctp_list_single_entry(&bp->address_list)) {
		addr = list_entry(bp->address_list.next,
				  struct sctp_sockaddr_entry, list);
5661
		if (sctp_is_any(sk, &addr->a)) {
5662 5663
			cnt = sctp_copy_laddrs(sk, bp->port, addrs,
						space_left, &bytes_copied);
5664 5665
			if (cnt < 0) {
				err = cnt;
5666
				goto out;
5667
			}
5668
			goto copy_getaddrs;
5669 5670 5671
		}
	}

5672
	buf = addrs;
5673 5674 5675 5676 5677
	/* Protection on the bound address list is not needed since
	 * in the socket option context we hold a socket lock and
	 * thus the bound address list can't change.
	 */
	list_for_each_entry(addr, &bp->address_list, list) {
5678
		memcpy(&temp, &addr->a, sizeof(temp));
5679 5680
		addrlen = sctp_get_pf_specific(sk->sk_family)
			      ->addr_to_user(sp, &temp);
5681 5682
		if (space_left < addrlen) {
			err =  -ENOMEM; /*fixme: right error?*/
5683
			goto out;
5684
		}
5685 5686
		memcpy(buf, &temp, addrlen);
		buf += addrlen;
5687
		bytes_copied += addrlen;
5688
		cnt++;
5689 5690 5691 5692
		space_left -= addrlen;
	}

copy_getaddrs:
5693 5694
	if (copy_to_user(to, addrs, bytes_copied)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5695
		goto out;
5696
	}
5697 5698
	if (put_user(cnt, &((struct sctp_getaddrs __user *)optval)->addr_num)) {
		err = -EFAULT;
S
Sebastian Siewior 已提交
5699
		goto out;
5700
	}
5701 5702 5703
	/* XXX: We should have accounted for sizeof(struct sctp_getaddrs) too,
	 * but we can't change it anymore.
	 */
5704
	if (put_user(bytes_copied, optlen))
5705
		err = -EFAULT;
S
Sebastian Siewior 已提交
5706
out:
5707
	kfree(addrs);
5708 5709 5710
	return err;
}

L
Linus Torvalds 已提交
5711 5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723
/* 7.1.10 Set Primary Address (SCTP_PRIMARY_ADDR)
 *
 * Requests that the local SCTP stack use the enclosed peer address as
 * the association primary.  The enclosed address must be one of the
 * association peer's addresses.
 */
static int sctp_getsockopt_primary_addr(struct sock *sk, int len,
					char __user *optval, int __user *optlen)
{
	struct sctp_prim prim;
	struct sctp_association *asoc;
	struct sctp_sock *sp = sctp_sk(sk);

5724
	if (len < sizeof(struct sctp_prim))
L
Linus Torvalds 已提交
5725 5726
		return -EINVAL;

5727 5728 5729
	len = sizeof(struct sctp_prim);

	if (copy_from_user(&prim, optval, len))
L
Linus Torvalds 已提交
5730 5731 5732 5733 5734 5735 5736 5737
		return -EFAULT;

	asoc = sctp_id2assoc(sk, prim.ssp_assoc_id);
	if (!asoc)
		return -EINVAL;

	if (!asoc->peer.primary_path)
		return -ENOTCONN;
5738

5739 5740
	memcpy(&prim.ssp_addr, &asoc->peer.primary_path->ipaddr,
		asoc->peer.primary_path->af_specific->sockaddr_len);
L
Linus Torvalds 已提交
5741

5742
	sctp_get_pf_specific(sk->sk_family)->addr_to_user(sp,
L
Linus Torvalds 已提交
5743 5744
			(union sctp_addr *)&prim.ssp_addr);

5745 5746 5747
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &prim, len))
L
Linus Torvalds 已提交
5748 5749 5750 5751 5752 5753
		return -EFAULT;

	return 0;
}

/*
5754
 * 7.1.11  Set Adaptation Layer Indicator (SCTP_ADAPTATION_LAYER)
L
Linus Torvalds 已提交
5755
 *
5756
 * Requests that the local endpoint set the specified Adaptation Layer
L
Linus Torvalds 已提交
5757 5758
 * Indication parameter for all future INIT and INIT-ACK exchanges.
 */
5759
static int sctp_getsockopt_adaptation_layer(struct sock *sk, int len,
L
Linus Torvalds 已提交
5760 5761
				  char __user *optval, int __user *optlen)
{
5762
	struct sctp_setadaptation adaptation;
L
Linus Torvalds 已提交
5763

5764
	if (len < sizeof(struct sctp_setadaptation))
L
Linus Torvalds 已提交
5765 5766
		return -EINVAL;

5767 5768
	len = sizeof(struct sctp_setadaptation);

5769
	adaptation.ssb_adaptation_ind = sctp_sk(sk)->adaptation_ind;
5770 5771 5772

	if (put_user(len, optlen))
		return -EFAULT;
5773
	if (copy_to_user(optval, &adaptation, len))
L
Linus Torvalds 已提交
5774
		return -EFAULT;
5775

L
Linus Torvalds 已提交
5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802
	return 0;
}

/*
 *
 * 7.1.14 Set default send parameters (SCTP_DEFAULT_SEND_PARAM)
 *
 *   Applications that wish to use the sendto() system call may wish to
 *   specify a default set of parameters that would normally be supplied
 *   through the inclusion of ancillary data.  This socket option allows
 *   such an application to set the default sctp_sndrcvinfo structure.


 *   The application that wishes to use this socket option simply passes
 *   in to this call the sctp_sndrcvinfo structure defined in Section
 *   5.2.2) The input parameters accepted by this call include
 *   sinfo_stream, sinfo_flags, sinfo_ppid, sinfo_context,
 *   sinfo_timetolive.  The user must provide the sinfo_assoc_id field in
 *   to this call if the caller is using the UDP model.
 *
 *   For getsockopt, it get the default sctp_sndrcvinfo structure.
 */
static int sctp_getsockopt_default_send_param(struct sock *sk,
					int len, char __user *optval,
					int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
5803 5804
	struct sctp_association *asoc;
	struct sctp_sndrcvinfo info;
L
Linus Torvalds 已提交
5805

5806
	if (len < sizeof(info))
L
Linus Torvalds 已提交
5807
		return -EINVAL;
5808

5809
	len = sizeof(info);
5810 5811

	if (copy_from_user(&info, optval, len))
L
Linus Torvalds 已提交
5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830
		return -EFAULT;

	asoc = sctp_id2assoc(sk, info.sinfo_assoc_id);
	if (!asoc && info.sinfo_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		info.sinfo_stream = asoc->default_stream;
		info.sinfo_flags = asoc->default_flags;
		info.sinfo_ppid = asoc->default_ppid;
		info.sinfo_context = asoc->default_context;
		info.sinfo_timetolive = asoc->default_timetolive;
	} else {
		info.sinfo_stream = sp->default_stream;
		info.sinfo_flags = sp->default_flags;
		info.sinfo_ppid = sp->default_ppid;
		info.sinfo_context = sp->default_context;
		info.sinfo_timetolive = sp->default_timetolive;
	}

5831 5832 5833
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
L
Linus Torvalds 已提交
5834 5835 5836 5837 5838
		return -EFAULT;

	return 0;
}

5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880
/* RFC6458, Section 8.1.31. Set/get Default Send Parameters
 * (SCTP_DEFAULT_SNDINFO)
 */
static int sctp_getsockopt_default_sndinfo(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_sndinfo info;

	if (len < sizeof(info))
		return -EINVAL;

	len = sizeof(info);

	if (copy_from_user(&info, optval, len))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, info.snd_assoc_id);
	if (!asoc && info.snd_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;
	if (asoc) {
		info.snd_sid = asoc->default_stream;
		info.snd_flags = asoc->default_flags;
		info.snd_ppid = asoc->default_ppid;
		info.snd_context = asoc->default_context;
	} else {
		info.snd_sid = sp->default_stream;
		info.snd_flags = sp->default_flags;
		info.snd_ppid = sp->default_ppid;
		info.snd_context = sp->default_context;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &info, len))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
5881 5882 5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923 5924 5925
/*
 *
 * 7.1.5 SCTP_NODELAY
 *
 * Turn on/off any Nagle-like algorithm.  This means that packets are
 * generally sent as soon as possible and no unnecessary delays are
 * introduced, at the cost of more packets in the network.  Expects an
 * integer boolean flag.
 */

static int sctp_getsockopt_nodelay(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = (sctp_sk(sk)->nodelay == 1);
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

/*
 *
 * 7.1.1 SCTP_RTOINFO
 *
 * The protocol parameters used to initialize and bound retransmission
 * timeout (RTO) are tunable. sctp_rtoinfo structure is used to access
 * and modify these parameters.
 * All parameters are time values, in milliseconds.  A value of 0, when
 * modifying the parameters, indicates that the current value should not
 * be changed.
 *
 */
static int sctp_getsockopt_rtoinfo(struct sock *sk, int len,
				char __user *optval,
				int __user *optlen) {
	struct sctp_rtoinfo rtoinfo;
	struct sctp_association *asoc;

5926
	if (len < sizeof (struct sctp_rtoinfo))
L
Linus Torvalds 已提交
5927 5928
		return -EINVAL;

5929 5930 5931
	len = sizeof(struct sctp_rtoinfo);

	if (copy_from_user(&rtoinfo, optval, len))
L
Linus Torvalds 已提交
5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965
		return -EFAULT;

	asoc = sctp_id2assoc(sk, rtoinfo.srto_assoc_id);

	if (!asoc && rtoinfo.srto_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Values corresponding to the specific association. */
	if (asoc) {
		rtoinfo.srto_initial = jiffies_to_msecs(asoc->rto_initial);
		rtoinfo.srto_max = jiffies_to_msecs(asoc->rto_max);
		rtoinfo.srto_min = jiffies_to_msecs(asoc->rto_min);
	} else {
		/* Values corresponding to the endpoint. */
		struct sctp_sock *sp = sctp_sk(sk);

		rtoinfo.srto_initial = sp->rtoinfo.srto_initial;
		rtoinfo.srto_max = sp->rtoinfo.srto_max;
		rtoinfo.srto_min = sp->rtoinfo.srto_min;
	}

	if (put_user(len, optlen))
		return -EFAULT;

	if (copy_to_user(optval, &rtoinfo, len))
		return -EFAULT;

	return 0;
}

/*
 *
 * 7.1.2 SCTP_ASSOCINFO
 *
5966
 * This option is used to tune the maximum retransmission attempts
L
Linus Torvalds 已提交
5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982
 * of the association.
 * Returns an error if the new association retransmission value is
 * greater than the sum of the retransmission value  of the peer.
 * See [SCTP] for more information.
 *
 */
static int sctp_getsockopt_associnfo(struct sock *sk, int len,
				     char __user *optval,
				     int __user *optlen)
{

	struct sctp_assocparams assocparams;
	struct sctp_association *asoc;
	struct list_head *pos;
	int cnt = 0;

5983
	if (len < sizeof (struct sctp_assocparams))
L
Linus Torvalds 已提交
5984 5985
		return -EINVAL;

5986 5987 5988
	len = sizeof(struct sctp_assocparams);

	if (copy_from_user(&assocparams, optval, len))
L
Linus Torvalds 已提交
5989 5990 5991 5992 5993 5994 5995 5996
		return -EFAULT;

	asoc = sctp_id2assoc(sk, assocparams.sasoc_assoc_id);

	if (!asoc && assocparams.sasoc_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	/* Values correspoinding to the specific association */
5997
	if (asoc) {
L
Linus Torvalds 已提交
5998 5999 6000
		assocparams.sasoc_asocmaxrxt = asoc->max_retrans;
		assocparams.sasoc_peer_rwnd = asoc->peer.rwnd;
		assocparams.sasoc_local_rwnd = asoc->a_rwnd;
6001
		assocparams.sasoc_cookie_life = ktime_to_ms(asoc->cookie_life);
L
Linus Torvalds 已提交
6002 6003

		list_for_each(pos, &asoc->peer.transport_addr_list) {
6004
			cnt++;
L
Linus Torvalds 已提交
6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059
		}

		assocparams.sasoc_number_peer_destinations = cnt;
	} else {
		/* Values corresponding to the endpoint */
		struct sctp_sock *sp = sctp_sk(sk);

		assocparams.sasoc_asocmaxrxt = sp->assocparams.sasoc_asocmaxrxt;
		assocparams.sasoc_peer_rwnd = sp->assocparams.sasoc_peer_rwnd;
		assocparams.sasoc_local_rwnd = sp->assocparams.sasoc_local_rwnd;
		assocparams.sasoc_cookie_life =
					sp->assocparams.sasoc_cookie_life;
		assocparams.sasoc_number_peer_destinations =
					sp->assocparams.
					sasoc_number_peer_destinations;
	}

	if (put_user(len, optlen))
		return -EFAULT;

	if (copy_to_user(optval, &assocparams, len))
		return -EFAULT;

	return 0;
}

/*
 * 7.1.16 Set/clear IPv4 mapped addresses (SCTP_I_WANT_MAPPED_V4_ADDR)
 *
 * This socket option is a boolean flag which turns on or off mapped V4
 * addresses.  If this option is turned on and the socket is type
 * PF_INET6, then IPv4 addresses will be mapped to V6 representation.
 * If this option is turned off, then no mapping will be done of V4
 * addresses and a user will receive both PF_INET6 and PF_INET type
 * addresses on the socket.
 */
static int sctp_getsockopt_mappedv4(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	int val;
	struct sctp_sock *sp = sctp_sk(sk);

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	val = sp->v4mapped;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070
/*
 * 7.1.29.  Set or Get the default context (SCTP_CONTEXT)
 * (chapter and verse is quoted at sctp_setsockopt_context())
 */
static int sctp_getsockopt_context(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;

6071
	if (len < sizeof(struct sctp_assoc_value))
6072 6073
		return -EINVAL;

6074 6075
	len = sizeof(struct sctp_assoc_value);

6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097
	if (copy_from_user(&params, optval, len))
		return -EFAULT;

	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		params.assoc_value = asoc->default_rcv_context;
	} else {
		params.assoc_value = sp->default_rcv_context;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &params, len))
		return -EFAULT;

	return 0;
}

L
Linus Torvalds 已提交
6098
/*
6099 6100 6101
 * 8.1.16.  Get or Set the Maximum Fragmentation Size (SCTP_MAXSEG)
 * This option will get or set the maximum size to put in any outgoing
 * SCTP DATA chunk.  If a message is larger than this size it will be
L
Linus Torvalds 已提交
6102 6103 6104
 * fragmented by SCTP into the specified size.  Note that the underlying
 * SCTP implementation may fragment into smaller sized chunks when the
 * PMTU of the underlying association is smaller than the value set by
6105 6106 6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123
 * the user.  The default value for this option is '0' which indicates
 * the user is NOT limiting fragmentation and only the PMTU will effect
 * SCTP's choice of DATA chunk size.  Note also that values set larger
 * than the maximum size of an IP datagram will effectively let SCTP
 * control fragmentation (i.e. the same as setting this option to 0).
 *
 * The following structure is used to access and modify this parameter:
 *
 * struct sctp_assoc_value {
 *   sctp_assoc_t assoc_id;
 *   uint32_t assoc_value;
 * };
 *
 * assoc_id:  This parameter is ignored for one-to-one style sockets.
 *    For one-to-many style sockets this parameter indicates which
 *    association the user is performing an action upon.  Note that if
 *    this field's value is zero then the endpoints default value is
 *    changed (effecting future associations only).
 * assoc_value:  This parameter specifies the maximum size in bytes.
L
Linus Torvalds 已提交
6124 6125 6126 6127
 */
static int sctp_getsockopt_maxseg(struct sock *sk, int len,
				  char __user *optval, int __user *optlen)
{
6128 6129
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
L
Linus Torvalds 已提交
6130

6131
	if (len == sizeof(int)) {
6132
		pr_warn_ratelimited(DEPRECATED
6133
				    "%s (pid %d) "
6134
				    "Use of int in maxseg socket option.\n"
6135 6136
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6137 6138 6139
		params.assoc_id = 0;
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6140
		if (copy_from_user(&params, optval, len))
6141 6142
			return -EFAULT;
	} else
L
Linus Torvalds 已提交
6143 6144
		return -EINVAL;

6145 6146 6147 6148 6149 6150 6151 6152
	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc && params.assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
		params.assoc_value = asoc->frag_point;
	else
		params.assoc_value = sctp_sk(sk)->user_frag;
L
Linus Torvalds 已提交
6153 6154 6155

	if (put_user(len, optlen))
		return -EFAULT;
6156 6157 6158 6159 6160 6161 6162
	if (len == sizeof(int)) {
		if (copy_to_user(optval, &params.assoc_value, len))
			return -EFAULT;
	} else {
		if (copy_to_user(optval, &params, len))
			return -EFAULT;
	}
L
Linus Torvalds 已提交
6163 6164 6165 6166

	return 0;
}

6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189
/*
 * 7.1.24.  Get or set fragmented interleave (SCTP_FRAGMENT_INTERLEAVE)
 * (chapter and verse is quoted at sctp_setsockopt_fragment_interleave())
 */
static int sctp_getsockopt_fragment_interleave(struct sock *sk, int len,
					       char __user *optval, int __user *optlen)
{
	int val;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);

	val = sctp_sk(sk)->frag_interleave;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6190 6191 6192 6193 6194 6195 6196 6197
/*
 * 7.1.25.  Set or Get the sctp partial delivery point
 * (chapter and verse is quoted at sctp_setsockopt_partial_delivery_point())
 */
static int sctp_getsockopt_partial_delivery_point(struct sock *sk, int len,
						  char __user *optval,
						  int __user *optlen)
{
6198
	u32 val;
6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210

	if (len < sizeof(u32))
		return -EINVAL;

	len = sizeof(u32);

	val = sctp_sk(sk)->pd_point;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6211
	return 0;
6212 6213
}

6214 6215 6216 6217 6218 6219 6220 6221
/*
 * 7.1.28.  Set or Get the maximum burst (SCTP_MAX_BURST)
 * (chapter and verse is quoted at sctp_setsockopt_maxburst())
 */
static int sctp_getsockopt_maxburst(struct sock *sk, int len,
				    char __user *optval,
				    int __user *optlen)
{
6222 6223 6224
	struct sctp_assoc_value params;
	struct sctp_sock *sp;
	struct sctp_association *asoc;
6225

6226
	if (len == sizeof(int)) {
6227
		pr_warn_ratelimited(DEPRECATED
6228
				    "%s (pid %d) "
6229
				    "Use of int in max_burst socket option.\n"
6230 6231
				    "Use struct sctp_assoc_value instead\n",
				    current->comm, task_pid_nr(current));
6232
		params.assoc_id = 0;
6233 6234
	} else if (len >= sizeof(struct sctp_assoc_value)) {
		len = sizeof(struct sctp_assoc_value);
6235 6236 6237 6238
		if (copy_from_user(&params, optval, len))
			return -EFAULT;
	} else
		return -EINVAL;
6239

6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258
	sp = sctp_sk(sk);

	if (params.assoc_id != 0) {
		asoc = sctp_id2assoc(sk, params.assoc_id);
		if (!asoc)
			return -EINVAL;
		params.assoc_value = asoc->max_burst;
	} else
		params.assoc_value = sp->max_burst;

	if (len == sizeof(int)) {
		if (copy_to_user(optval, &params.assoc_value, len))
			return -EFAULT;
	} else {
		if (copy_to_user(optval, &params, len))
			return -EFAULT;
	}

	return 0;
6259 6260 6261

}

6262 6263 6264
static int sctp_getsockopt_hmac_ident(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6265
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6266
	struct sctp_hmacalgo  __user *p = (void __user *)optval;
6267
	struct sctp_hmac_algo_param *hmacs;
6268 6269
	__u16 data_len = 0;
	u32 num_idents;
6270
	int i;
6271

6272
	if (!ep->auth_enable)
6273
		return -EACCES;
6274

6275
	hmacs = ep->auth_hmacs_list;
6276 6277
	data_len = ntohs(hmacs->param_hdr.length) -
		   sizeof(struct sctp_paramhdr);
6278

6279
	if (len < sizeof(struct sctp_hmacalgo) + data_len)
6280
		return -EINVAL;
6281 6282 6283 6284

	len = sizeof(struct sctp_hmacalgo) + data_len;
	num_idents = data_len / sizeof(u16);

6285 6286
	if (put_user(len, optlen))
		return -EFAULT;
6287 6288
	if (put_user(num_idents, &p->shmac_num_idents))
		return -EFAULT;
6289 6290 6291 6292 6293 6294
	for (i = 0; i < num_idents; i++) {
		__u16 hmacid = ntohs(hmacs->hmac_ids[i]);

		if (copy_to_user(&p->shmac_idents[i], &hmacid, sizeof(__u16)))
			return -EFAULT;
	}
6295 6296 6297 6298 6299 6300
	return 0;
}

static int sctp_getsockopt_active_key(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6301
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
6302 6303 6304
	struct sctp_authkeyid val;
	struct sctp_association *asoc;

6305
	if (!ep->auth_enable)
6306 6307
		return -EACCES;

6308 6309
	if (len < sizeof(struct sctp_authkeyid))
		return -EINVAL;
6310 6311 6312

	len = sizeof(struct sctp_authkeyid);
	if (copy_from_user(&val, optval, len))
6313 6314 6315 6316 6317 6318 6319 6320 6321
		return -EFAULT;

	asoc = sctp_id2assoc(sk, val.scact_assoc_id);
	if (!asoc && val.scact_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
		val.scact_keynumber = asoc->active_key_id;
	else
6322
		val.scact_keynumber = ep->active_key_id;
6323

6324 6325 6326 6327 6328
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

6329 6330 6331 6332 6333 6334
	return 0;
}

static int sctp_getsockopt_peer_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6335
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6336
	struct sctp_authchunks __user *p = (void __user *)optval;
6337 6338 6339
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6340
	u32    num_chunks = 0;
6341 6342
	char __user *to;

6343
	if (!ep->auth_enable)
6344 6345 6346
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6347 6348
		return -EINVAL;

6349
	if (copy_from_user(&val, optval, sizeof(val)))
6350 6351
		return -EFAULT;

A
Al Viro 已提交
6352
	to = p->gauth_chunks;
6353 6354 6355 6356 6357
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc)
		return -EINVAL;

	ch = asoc->peer.peer_chunks;
6358 6359
	if (!ch)
		goto num;
6360 6361

	/* See if the user provided enough room for all the data */
6362
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6363
	if (len < num_chunks)
6364 6365
		return -EINVAL;

6366
	if (copy_to_user(to, ch->chunks, num_chunks))
6367
		return -EFAULT;
6368 6369
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6370 6371
	if (put_user(len, optlen))
		return -EFAULT;
6372 6373
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6374 6375 6376 6377 6378 6379
	return 0;
}

static int sctp_getsockopt_local_auth_chunks(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
6380
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
A
Al Viro 已提交
6381
	struct sctp_authchunks __user *p = (void __user *)optval;
6382 6383 6384
	struct sctp_authchunks val;
	struct sctp_association *asoc;
	struct sctp_chunks_param *ch;
6385
	u32    num_chunks = 0;
6386 6387
	char __user *to;

6388
	if (!ep->auth_enable)
6389 6390 6391
		return -EACCES;

	if (len < sizeof(struct sctp_authchunks))
6392 6393
		return -EINVAL;

6394
	if (copy_from_user(&val, optval, sizeof(val)))
6395 6396
		return -EFAULT;

A
Al Viro 已提交
6397
	to = p->gauth_chunks;
6398 6399 6400 6401 6402
	asoc = sctp_id2assoc(sk, val.gauth_assoc_id);
	if (!asoc && val.gauth_assoc_id && sctp_style(sk, UDP))
		return -EINVAL;

	if (asoc)
6403
		ch = (struct sctp_chunks_param *)asoc->c.auth_chunks;
6404
	else
6405
		ch = ep->auth_chunk_list;
6406

6407 6408 6409
	if (!ch)
		goto num;

6410
	num_chunks = ntohs(ch->param_hdr.length) - sizeof(struct sctp_paramhdr);
6411
	if (len < sizeof(struct sctp_authchunks) + num_chunks)
6412 6413
		return -EINVAL;

6414 6415 6416 6417
	if (copy_to_user(to, ch->chunks, num_chunks))
		return -EFAULT;
num:
	len = sizeof(struct sctp_authchunks) + num_chunks;
6418 6419
	if (put_user(len, optlen))
		return -EFAULT;
6420 6421
	if (put_user(num_chunks, &p->gauth_number_of_chunks))
		return -EFAULT;
6422 6423 6424 6425

	return 0;
}

6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457
/*
 * 8.2.5.  Get the Current Number of Associations (SCTP_GET_ASSOC_NUMBER)
 * This option gets the current number of associations that are attached
 * to a one-to-many style socket.  The option value is an uint32_t.
 */
static int sctp_getsockopt_assoc_number(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	u32 val = 0;

	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;

	if (len < sizeof(u32))
		return -EINVAL;

	len = sizeof(u32);

	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		val++;
	}

	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479
/*
 * 8.1.23 SCTP_AUTO_ASCONF
 * See the corresponding setsockopt entry as description
 */
static int sctp_getsockopt_auto_asconf(struct sock *sk, int len,
				   char __user *optval, int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->do_auto_asconf && sctp_is_ep_boundall(sk))
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;
	return 0;
}

6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509
/*
 * 8.2.6. Get the Current Identifiers of Associations
 *        (SCTP_GET_ASSOC_ID_LIST)
 *
 * This option gets the current list of SCTP association identifiers of
 * the SCTP associations handled by a one-to-many style socket.
 */
static int sctp_getsockopt_assoc_ids(struct sock *sk, int len,
				    char __user *optval, int __user *optlen)
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_association *asoc;
	struct sctp_assoc_ids *ids;
	u32 num = 0;

	if (sctp_style(sk, TCP))
		return -EOPNOTSUPP;

	if (len < sizeof(struct sctp_assoc_ids))
		return -EINVAL;

	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		num++;
	}

	if (len < sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num)
		return -EINVAL;

	len = sizeof(struct sctp_assoc_ids) + sizeof(sctp_assoc_t) * num;

6510
	ids = kmalloc(len, GFP_USER | __GFP_NOWARN);
6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528
	if (unlikely(!ids))
		return -ENOMEM;

	ids->gaids_number_of_ids = num;
	num = 0;
	list_for_each_entry(asoc, &(sp->ep->asocs), asocs) {
		ids->gaids_assoc_id[num++] = asoc->assoc_id;
	}

	if (put_user(len, optlen) || copy_to_user(optval, ids, len)) {
		kfree(ids);
		return -EFAULT;
	}

	kfree(ids);
	return 0;
}

6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573
/*
 * SCTP_PEER_ADDR_THLDS
 *
 * This option allows us to fetch the partially failed threshold for one or all
 * transports in an association.  See Section 6.1 of:
 * http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
 */
static int sctp_getsockopt_paddr_thresholds(struct sock *sk,
					    char __user *optval,
					    int len,
					    int __user *optlen)
{
	struct sctp_paddrthlds val;
	struct sctp_transport *trans;
	struct sctp_association *asoc;

	if (len < sizeof(struct sctp_paddrthlds))
		return -EINVAL;
	len = sizeof(struct sctp_paddrthlds);
	if (copy_from_user(&val, (struct sctp_paddrthlds __user *)optval, len))
		return -EFAULT;

	if (sctp_is_any(sk, (const union sctp_addr *)&val.spt_address)) {
		asoc = sctp_id2assoc(sk, val.spt_assoc_id);
		if (!asoc)
			return -ENOENT;

		val.spt_pathpfthld = asoc->pf_retrans;
		val.spt_pathmaxrxt = asoc->pathmaxrxt;
	} else {
		trans = sctp_addr_id2transport(sk, &val.spt_address,
					       val.spt_assoc_id);
		if (!trans)
			return -ENOENT;

		val.spt_pathmaxrxt = trans->pathmaxrxt;
		val.spt_pathpfthld = trans->pf_retrans;
	}

	if (put_user(len, optlen) || copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590
/*
 * SCTP_GET_ASSOC_STATS
 *
 * This option retrieves local per endpoint statistics. It is modeled
 * after OpenSolaris' implementation
 */
static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
				       char __user *optval,
				       int __user *optlen)
{
	struct sctp_assoc_stats sas;
	struct sctp_association *asoc = NULL;

	/* User must provide at least the assoc id */
	if (len < sizeof(sctp_assoc_t))
		return -EINVAL;

6591 6592 6593
	/* Allow the struct to grow and fill in as much as possible */
	len = min_t(size_t, len, sizeof(sas));

6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629
	if (copy_from_user(&sas, optval, len))
		return -EFAULT;

	asoc = sctp_id2assoc(sk, sas.sas_assoc_id);
	if (!asoc)
		return -EINVAL;

	sas.sas_rtxchunks = asoc->stats.rtxchunks;
	sas.sas_gapcnt = asoc->stats.gapcnt;
	sas.sas_outofseqtsns = asoc->stats.outofseqtsns;
	sas.sas_osacks = asoc->stats.osacks;
	sas.sas_isacks = asoc->stats.isacks;
	sas.sas_octrlchunks = asoc->stats.octrlchunks;
	sas.sas_ictrlchunks = asoc->stats.ictrlchunks;
	sas.sas_oodchunks = asoc->stats.oodchunks;
	sas.sas_iodchunks = asoc->stats.iodchunks;
	sas.sas_ouodchunks = asoc->stats.ouodchunks;
	sas.sas_iuodchunks = asoc->stats.iuodchunks;
	sas.sas_idupchunks = asoc->stats.idupchunks;
	sas.sas_opackets = asoc->stats.opackets;
	sas.sas_ipackets = asoc->stats.ipackets;

	/* New high max rto observed, will return 0 if not a single
	 * RTO update took place. obs_rto_ipaddr will be bogus
	 * in such a case
	 */
	sas.sas_maxrto = asoc->stats.max_obs_rto;
	memcpy(&sas.sas_obs_rto_ipaddr, &asoc->stats.obs_rto_ipaddr,
		sizeof(struct sockaddr_storage));

	/* Mark beginning of a new observation period */
	asoc->stats.max_obs_rto = asoc->rto_min;

	if (put_user(len, optlen))
		return -EFAULT;

6630
	pr_debug("%s: len:%d, assoc_id:%d\n", __func__, len, sas.sas_assoc_id);
6631 6632 6633 6634 6635 6636 6637

	if (copy_to_user(optval, &sas, len))
		return -EFAULT;

	return 0;
}

6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657
static int sctp_getsockopt_recvrcvinfo(struct sock *sk,	int len,
				       char __user *optval,
				       int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->recvrcvinfo)
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674 6675 6676 6677
static int sctp_getsockopt_recvnxtinfo(struct sock *sk,	int len,
				       char __user *optval,
				       int __user *optlen)
{
	int val = 0;

	if (len < sizeof(int))
		return -EINVAL;

	len = sizeof(int);
	if (sctp_sk(sk)->recvnxtinfo)
		val = 1;
	if (put_user(len, optlen))
		return -EFAULT;
	if (copy_to_user(optval, &val, len))
		return -EFAULT;

	return 0;
}

6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718
static int sctp_getsockopt_pr_supported(struct sock *sk, int len,
					char __user *optval,
					int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->prsctp_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->prsctp_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761
static int sctp_getsockopt_default_prinfo(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_default_prinfo info;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(info)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(info);
	if (copy_from_user(&info, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, info.pr_assoc_id);
	if (asoc) {
		info.pr_policy = SCTP_PR_POLICY(asoc->default_flags);
		info.pr_value = asoc->default_timetolive;
	} else if (!info.pr_assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		info.pr_policy = SCTP_PR_POLICY(sp->default_flags);
		info.pr_value = sp->default_timetolive;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &info, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819
static int sctp_getsockopt_pr_assocstatus(struct sock *sk, int len,
					  char __user *optval,
					  int __user *optlen)
{
	struct sctp_prstatus params;
	struct sctp_association *asoc;
	int policy;
	int retval = -EINVAL;

	if (len < sizeof(params))
		goto out;

	len = sizeof(params);
	if (copy_from_user(&params, optval, len)) {
		retval = -EFAULT;
		goto out;
	}

	policy = params.sprstat_policy;
	if (policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
	if (!asoc)
		goto out;

	if (policy == SCTP_PR_SCTP_NONE) {
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
			params.sprstat_abandoned_unsent +=
				asoc->abandoned_unsent[policy];
			params.sprstat_abandoned_sent +=
				asoc->abandoned_sent[policy];
		}
	} else {
		params.sprstat_abandoned_unsent =
			asoc->abandoned_unsent[__SCTP_PR_INDEX(policy)];
		params.sprstat_abandoned_sent =
			asoc->abandoned_sent[__SCTP_PR_INDEX(policy)];
	}

	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

	retval = 0;

out:
	return retval;
}

6820 6821 6822 6823
static int sctp_getsockopt_pr_streamstatus(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
6824
	struct sctp_stream_out_ext *streamoute;
6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843
	struct sctp_association *asoc;
	struct sctp_prstatus params;
	int retval = -EINVAL;
	int policy;

	if (len < sizeof(params))
		goto out;

	len = sizeof(params);
	if (copy_from_user(&params, optval, len)) {
		retval = -EFAULT;
		goto out;
	}

	policy = params.sprstat_policy;
	if (policy & ~SCTP_PR_SCTP_MASK)
		goto out;

	asoc = sctp_id2assoc(sk, params.sprstat_assoc_id);
6844
	if (!asoc || params.sprstat_sid >= asoc->stream.outcnt)
6845 6846
		goto out;

6847 6848 6849 6850 6851 6852 6853 6854 6855
	streamoute = asoc->stream.out[params.sprstat_sid].ext;
	if (!streamoute) {
		/* Not allocated yet, means all stats are 0 */
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		retval = 0;
		goto out;
	}

6856 6857 6858 6859 6860
	if (policy == SCTP_PR_SCTP_NONE) {
		params.sprstat_abandoned_unsent = 0;
		params.sprstat_abandoned_sent = 0;
		for (policy = 0; policy <= SCTP_PR_INDEX(MAX); policy++) {
			params.sprstat_abandoned_unsent +=
6861
				streamoute->abandoned_unsent[policy];
6862
			params.sprstat_abandoned_sent +=
6863
				streamoute->abandoned_sent[policy];
6864 6865 6866
		}
	} else {
		params.sprstat_abandoned_unsent =
6867
			streamoute->abandoned_unsent[__SCTP_PR_INDEX(policy)];
6868
		params.sprstat_abandoned_sent =
6869
			streamoute->abandoned_sent[__SCTP_PR_INDEX(policy)];
6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882
	}

	if (put_user(len, optlen) || copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

	retval = 0;

out:
	return retval;
}

6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923
static int sctp_getsockopt_reconfig_supported(struct sock *sk, int len,
					      char __user *optval,
					      int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->reconf_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->reconf_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964
static int sctp_getsockopt_enable_strreset(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->strreset_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->ep->strreset_enable;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

6965 6966 6967 6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001
static int sctp_getsockopt_scheduler(struct sock *sk, int len,
				     char __user *optval,
				     int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	params.assoc_value = sctp_sched_get_sched(asoc);

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

7002 7003 7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038 7039 7040 7041 7042 7043
static int sctp_getsockopt_scheduler_value(struct sock *sk, int len,
					   char __user *optval,
					   int __user *optlen)
{
	struct sctp_stream_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (!asoc) {
		retval = -EINVAL;
		goto out;
	}

	retval = sctp_sched_get_value(asoc, params.stream_id,
				      &params.stream_value);
	if (retval)
		goto out;

	if (put_user(len, optlen)) {
		retval = -EFAULT;
		goto out;
	}

	if (copy_to_user(optval, &params, len)) {
		retval = -EFAULT;
		goto out;
	}

out:
	return retval;
}

7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062 7063 7064 7065 7066 7067 7068 7069 7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083 7084
static int sctp_getsockopt_interleaving_supported(struct sock *sk, int len,
						  char __user *optval,
						  int __user *optlen)
{
	struct sctp_assoc_value params;
	struct sctp_association *asoc;
	int retval = -EFAULT;

	if (len < sizeof(params)) {
		retval = -EINVAL;
		goto out;
	}

	len = sizeof(params);
	if (copy_from_user(&params, optval, len))
		goto out;

	asoc = sctp_id2assoc(sk, params.assoc_id);
	if (asoc) {
		params.assoc_value = asoc->intl_enable;
	} else if (!params.assoc_id) {
		struct sctp_sock *sp = sctp_sk(sk);

		params.assoc_value = sp->strm_interleave;
	} else {
		retval = -EINVAL;
		goto out;
	}

	if (put_user(len, optlen))
		goto out;

	if (copy_to_user(optval, &params, len))
		goto out;

	retval = 0;

out:
	return retval;
}

7085 7086
static int sctp_getsockopt(struct sock *sk, int level, int optname,
			   char __user *optval, int __user *optlen)
L
Linus Torvalds 已提交
7087 7088 7089 7090
{
	int retval = 0;
	int len;

7091
	pr_debug("%s: sk:%p, optname:%d\n", __func__, sk, optname);
L
Linus Torvalds 已提交
7092 7093 7094 7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105 7106 7107 7108

	/* I can hardly begin to describe how wrong this is.  This is
	 * so broken as to be worse than useless.  The API draft
	 * REALLY is NOT helpful here...  I am not convinced that the
	 * semantics of getsockopt() with a level OTHER THAN SOL_SCTP
	 * are at all well-founded.
	 */
	if (level != SOL_SCTP) {
		struct sctp_af *af = sctp_sk(sk)->pf->af;

		retval = af->getsockopt(sk, level, optname, optval, optlen);
		return retval;
	}

	if (get_user(len, optlen))
		return -EFAULT;

J
Jiri Slaby 已提交
7109 7110 7111
	if (len < 0)
		return -EINVAL;

7112
	lock_sock(sk);
L
Linus Torvalds 已提交
7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129 7130

	switch (optname) {
	case SCTP_STATUS:
		retval = sctp_getsockopt_sctp_status(sk, len, optval, optlen);
		break;
	case SCTP_DISABLE_FRAGMENTS:
		retval = sctp_getsockopt_disable_fragments(sk, len, optval,
							   optlen);
		break;
	case SCTP_EVENTS:
		retval = sctp_getsockopt_events(sk, len, optval, optlen);
		break;
	case SCTP_AUTOCLOSE:
		retval = sctp_getsockopt_autoclose(sk, len, optval, optlen);
		break;
	case SCTP_SOCKOPT_PEELOFF:
		retval = sctp_getsockopt_peeloff(sk, len, optval, optlen);
		break;
7131 7132 7133
	case SCTP_SOCKOPT_PEELOFF_FLAGS:
		retval = sctp_getsockopt_peeloff_flags(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7134 7135 7136 7137
	case SCTP_PEER_ADDR_PARAMS:
		retval = sctp_getsockopt_peer_addr_params(sk, len, optval,
							  optlen);
		break;
7138
	case SCTP_DELAYED_SACK:
7139
		retval = sctp_getsockopt_delayed_ack(sk, len, optval,
7140 7141
							  optlen);
		break;
L
Linus Torvalds 已提交
7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152
	case SCTP_INITMSG:
		retval = sctp_getsockopt_initmsg(sk, len, optval, optlen);
		break;
	case SCTP_GET_PEER_ADDRS:
		retval = sctp_getsockopt_peer_addrs(sk, len, optval,
						    optlen);
		break;
	case SCTP_GET_LOCAL_ADDRS:
		retval = sctp_getsockopt_local_addrs(sk, len, optval,
						     optlen);
		break;
7153 7154 7155
	case SCTP_SOCKOPT_CONNECTX3:
		retval = sctp_getsockopt_connectx3(sk, len, optval, optlen);
		break;
L
Linus Torvalds 已提交
7156 7157 7158 7159
	case SCTP_DEFAULT_SEND_PARAM:
		retval = sctp_getsockopt_default_send_param(sk, len,
							    optval, optlen);
		break;
7160 7161 7162 7163
	case SCTP_DEFAULT_SNDINFO:
		retval = sctp_getsockopt_default_sndinfo(sk, len,
							 optval, optlen);
		break;
L
Linus Torvalds 已提交
7164 7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185
	case SCTP_PRIMARY_ADDR:
		retval = sctp_getsockopt_primary_addr(sk, len, optval, optlen);
		break;
	case SCTP_NODELAY:
		retval = sctp_getsockopt_nodelay(sk, len, optval, optlen);
		break;
	case SCTP_RTOINFO:
		retval = sctp_getsockopt_rtoinfo(sk, len, optval, optlen);
		break;
	case SCTP_ASSOCINFO:
		retval = sctp_getsockopt_associnfo(sk, len, optval, optlen);
		break;
	case SCTP_I_WANT_MAPPED_V4_ADDR:
		retval = sctp_getsockopt_mappedv4(sk, len, optval, optlen);
		break;
	case SCTP_MAXSEG:
		retval = sctp_getsockopt_maxseg(sk, len, optval, optlen);
		break;
	case SCTP_GET_PEER_ADDR_INFO:
		retval = sctp_getsockopt_peer_addr_info(sk, len, optval,
							optlen);
		break;
7186 7187
	case SCTP_ADAPTATION_LAYER:
		retval = sctp_getsockopt_adaptation_layer(sk, len, optval,
L
Linus Torvalds 已提交
7188 7189
							optlen);
		break;
7190 7191 7192
	case SCTP_CONTEXT:
		retval = sctp_getsockopt_context(sk, len, optval, optlen);
		break;
7193 7194 7195 7196
	case SCTP_FRAGMENT_INTERLEAVE:
		retval = sctp_getsockopt_fragment_interleave(sk, len, optval,
							     optlen);
		break;
7197 7198 7199 7200
	case SCTP_PARTIAL_DELIVERY_POINT:
		retval = sctp_getsockopt_partial_delivery_point(sk, len, optval,
								optlen);
		break;
7201 7202 7203
	case SCTP_MAX_BURST:
		retval = sctp_getsockopt_maxburst(sk, len, optval, optlen);
		break;
7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222
	case SCTP_AUTH_KEY:
	case SCTP_AUTH_CHUNK:
	case SCTP_AUTH_DELETE_KEY:
		retval = -EOPNOTSUPP;
		break;
	case SCTP_HMAC_IDENT:
		retval = sctp_getsockopt_hmac_ident(sk, len, optval, optlen);
		break;
	case SCTP_AUTH_ACTIVE_KEY:
		retval = sctp_getsockopt_active_key(sk, len, optval, optlen);
		break;
	case SCTP_PEER_AUTH_CHUNKS:
		retval = sctp_getsockopt_peer_auth_chunks(sk, len, optval,
							optlen);
		break;
	case SCTP_LOCAL_AUTH_CHUNKS:
		retval = sctp_getsockopt_local_auth_chunks(sk, len, optval,
							optlen);
		break;
7223 7224 7225
	case SCTP_GET_ASSOC_NUMBER:
		retval = sctp_getsockopt_assoc_number(sk, len, optval, optlen);
		break;
7226 7227 7228
	case SCTP_GET_ASSOC_ID_LIST:
		retval = sctp_getsockopt_assoc_ids(sk, len, optval, optlen);
		break;
7229 7230 7231
	case SCTP_AUTO_ASCONF:
		retval = sctp_getsockopt_auto_asconf(sk, len, optval, optlen);
		break;
7232 7233 7234
	case SCTP_PEER_ADDR_THLDS:
		retval = sctp_getsockopt_paddr_thresholds(sk, optval, len, optlen);
		break;
7235 7236 7237
	case SCTP_GET_ASSOC_STATS:
		retval = sctp_getsockopt_assoc_stats(sk, len, optval, optlen);
		break;
7238 7239 7240
	case SCTP_RECVRCVINFO:
		retval = sctp_getsockopt_recvrcvinfo(sk, len, optval, optlen);
		break;
7241 7242 7243
	case SCTP_RECVNXTINFO:
		retval = sctp_getsockopt_recvnxtinfo(sk, len, optval, optlen);
		break;
7244 7245 7246
	case SCTP_PR_SUPPORTED:
		retval = sctp_getsockopt_pr_supported(sk, len, optval, optlen);
		break;
7247 7248 7249 7250
	case SCTP_DEFAULT_PRINFO:
		retval = sctp_getsockopt_default_prinfo(sk, len, optval,
							optlen);
		break;
7251 7252 7253 7254
	case SCTP_PR_ASSOC_STATUS:
		retval = sctp_getsockopt_pr_assocstatus(sk, len, optval,
							optlen);
		break;
7255 7256 7257 7258
	case SCTP_PR_STREAM_STATUS:
		retval = sctp_getsockopt_pr_streamstatus(sk, len, optval,
							 optlen);
		break;
7259 7260 7261 7262
	case SCTP_RECONFIG_SUPPORTED:
		retval = sctp_getsockopt_reconfig_supported(sk, len, optval,
							    optlen);
		break;
7263 7264 7265 7266
	case SCTP_ENABLE_STREAM_RESET:
		retval = sctp_getsockopt_enable_strreset(sk, len, optval,
							 optlen);
		break;
7267 7268 7269 7270
	case SCTP_STREAM_SCHEDULER:
		retval = sctp_getsockopt_scheduler(sk, len, optval,
						   optlen);
		break;
7271 7272 7273 7274
	case SCTP_STREAM_SCHEDULER_VALUE:
		retval = sctp_getsockopt_scheduler_value(sk, len, optval,
							 optlen);
		break;
7275 7276 7277 7278
	case SCTP_INTERLEAVING_SUPPORTED:
		retval = sctp_getsockopt_interleaving_supported(sk, len, optval,
								optlen);
		break;
L
Linus Torvalds 已提交
7279 7280 7281
	default:
		retval = -ENOPROTOOPT;
		break;
7282
	}
L
Linus Torvalds 已提交
7283

7284
	release_sock(sk);
L
Linus Torvalds 已提交
7285 7286 7287
	return retval;
}

7288
static int sctp_hash(struct sock *sk)
L
Linus Torvalds 已提交
7289 7290
{
	/* STUB */
7291
	return 0;
L
Linus Torvalds 已提交
7292 7293 7294 7295 7296 7297 7298 7299 7300 7301 7302 7303 7304 7305 7306 7307 7308 7309 7310 7311
}

static void sctp_unhash(struct sock *sk)
{
	/* STUB */
}

/* Check if port is acceptable.  Possibly find first available port.
 *
 * The port hash table (contained in the 'global' SCTP protocol storage
 * returned by struct sctp_protocol *sctp_get_protocol()). The hash
 * table is an array of 4096 lists (sctp_bind_hashbucket). Each
 * list (the list number is the port number hashed out, so as you
 * would expect from a hash function, all the ports in a given list have
 * such a number that hashes out to the same list number; you were
 * expecting that, right?); so each list has a set of ports, with a
 * link to the socket (struct sock) that uses it, the port number and
 * a fastreuse flag (FIXME: NPI ipg).
 */
static struct sctp_bind_bucket *sctp_bucket_create(
7312
	struct sctp_bind_hashbucket *head, struct net *, unsigned short snum);
L
Linus Torvalds 已提交
7313 7314 7315 7316

static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
{
	struct sctp_bind_hashbucket *head; /* hash list */
7317
	struct sctp_bind_bucket *pp;
L
Linus Torvalds 已提交
7318 7319 7320
	unsigned short snum;
	int ret;

A
Al Viro 已提交
7321
	snum = ntohs(addr->v4.sin_port);
L
Linus Torvalds 已提交
7322

7323 7324
	pr_debug("%s: begins, snum:%d\n", __func__, snum);

7325
	local_bh_disable();
L
Linus Torvalds 已提交
7326 7327

	if (snum == 0) {
S
Stephen Hemminger 已提交
7328
		/* Search for an available port. */
7329 7330
		int low, high, remaining, index;
		unsigned int rover;
7331
		struct net *net = sock_net(sk);
7332

7333
		inet_get_local_port_range(net, &low, &high);
7334
		remaining = (high - low) + 1;
7335
		rover = prandom_u32() % remaining + low;
L
Linus Torvalds 已提交
7336 7337 7338 7339 7340

		do {
			rover++;
			if ((rover < low) || (rover > high))
				rover = low;
7341
			if (inet_is_local_reserved_port(net, rover))
7342
				continue;
7343
			index = sctp_phashfn(sock_net(sk), rover);
L
Linus Torvalds 已提交
7344
			head = &sctp_port_hashtable[index];
7345
			spin_lock(&head->lock);
7346
			sctp_for_each_hentry(pp, &head->chain)
7347 7348
				if ((pp->port == rover) &&
				    net_eq(sock_net(sk), pp->net))
L
Linus Torvalds 已提交
7349 7350 7351
					goto next;
			break;
		next:
7352
			spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7353 7354 7355 7356 7357 7358 7359 7360 7361 7362 7363 7364 7365 7366 7367 7368 7369 7370 7371
		} while (--remaining > 0);

		/* Exhausted local port range during search? */
		ret = 1;
		if (remaining <= 0)
			goto fail;

		/* OK, here is the one we will use.  HEAD (the port
		 * hash table list entry) is non-NULL and we hold it's
		 * mutex.
		 */
		snum = rover;
	} else {
		/* We are given an specific port number; we verify
		 * that it is not being used. If it is used, we will
		 * exahust the search in the hash list corresponding
		 * to the port number (snum) - we detect that with the
		 * port iterator, pp being NULL.
		 */
7372
		head = &sctp_port_hashtable[sctp_phashfn(sock_net(sk), snum)];
7373
		spin_lock(&head->lock);
7374
		sctp_for_each_hentry(pp, &head->chain) {
7375
			if ((pp->port == snum) && net_eq(pp->net, sock_net(sk)))
L
Linus Torvalds 已提交
7376 7377 7378 7379 7380 7381 7382 7383 7384 7385 7386 7387 7388 7389 7390
				goto pp_found;
		}
	}
	pp = NULL;
	goto pp_not_found;
pp_found:
	if (!hlist_empty(&pp->owner)) {
		/* We had a port hash table hit - there is an
		 * available port (pp != NULL) and it is being
		 * used by other socket (pp->owner not empty); that other
		 * socket is going to be sk2.
		 */
		int reuse = sk->sk_reuse;
		struct sock *sk2;

7391 7392
		pr_debug("%s: found a possible match\n", __func__);

7393 7394
		if (pp->fastreuse && sk->sk_reuse &&
			sk->sk_state != SCTP_SS_LISTENING)
L
Linus Torvalds 已提交
7395 7396 7397 7398 7399 7400 7401 7402 7403 7404 7405 7406
			goto success;

		/* Run through the list of sockets bound to the port
		 * (pp->port) [via the pointers bind_next and
		 * bind_pprev in the struct sock *sk2 (pp->sk)]. On each one,
		 * we get the endpoint they describe and run through
		 * the endpoint's list of IP (v4 or v6) addresses,
		 * comparing each of the addresses with the address of
		 * the socket sk. If we find a match, then that means
		 * that this port/socket (sk) combination are already
		 * in an endpoint.
		 */
7407
		sk_for_each_bound(sk2, &pp->owner) {
L
Linus Torvalds 已提交
7408 7409 7410
			struct sctp_endpoint *ep2;
			ep2 = sctp_sk(sk2)->ep;

7411 7412 7413
			if (sk == sk2 ||
			    (reuse && sk2->sk_reuse &&
			     sk2->sk_state != SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
7414 7415
				continue;

7416 7417
			if (sctp_bind_addr_conflict(&ep2->base.bind_addr, addr,
						 sctp_sk(sk2), sctp_sk(sk))) {
L
Linus Torvalds 已提交
7418 7419 7420 7421
				ret = (long)sk2;
				goto fail_unlock;
			}
		}
7422 7423

		pr_debug("%s: found a match\n", __func__);
L
Linus Torvalds 已提交
7424 7425 7426 7427
	}
pp_not_found:
	/* If there was a hash table miss, create a new port.  */
	ret = 1;
7428
	if (!pp && !(pp = sctp_bucket_create(head, sock_net(sk), snum)))
L
Linus Torvalds 已提交
7429 7430 7431 7432 7433 7434
		goto fail_unlock;

	/* In either case (hit or miss), make sure fastreuse is 1 only
	 * if sk->sk_reuse is too (that is, if the caller requested
	 * SO_REUSEADDR on this socket -sk-).
	 */
7435 7436 7437 7438 7439 7440 7441
	if (hlist_empty(&pp->owner)) {
		if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
			pp->fastreuse = 1;
		else
			pp->fastreuse = 0;
	} else if (pp->fastreuse &&
		(!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
L
Linus Torvalds 已提交
7442 7443 7444 7445 7446 7447 7448 7449
		pp->fastreuse = 0;

	/* We are set, so fill up all the data in the hash table
	 * entry, tie the socket list information with the rest of the
	 * sockets FIXME: Blurry, NPI (ipg).
	 */
success:
	if (!sctp_sk(sk)->bind_hash) {
E
Eric Dumazet 已提交
7450
		inet_sk(sk)->inet_num = snum;
L
Linus Torvalds 已提交
7451 7452 7453 7454 7455 7456
		sk_add_bind_node(sk, &pp->owner);
		sctp_sk(sk)->bind_hash = pp;
	}
	ret = 0;

fail_unlock:
7457
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7458 7459

fail:
7460
	local_bh_enable();
L
Linus Torvalds 已提交
7461 7462 7463 7464 7465 7466 7467 7468 7469 7470 7471 7472 7473 7474 7475 7476
	return ret;
}

/* Assign a 'snum' port to the socket.  If snum == 0, an ephemeral
 * port is requested.
 */
static int sctp_get_port(struct sock *sk, unsigned short snum)
{
	union sctp_addr addr;
	struct sctp_af *af = sctp_sk(sk)->pf->af;

	/* Set up a dummy address struct from the sk. */
	af->from_sk(&addr, sk);
	addr.v4.sin_port = htons(snum);

	/* Note: sk->sk_num gets filled in if ephemeral port request. */
7477
	return !!sctp_get_port_local(sk, &addr);
L
Linus Torvalds 已提交
7478 7479 7480
}

/*
7481
 *  Move a socket to LISTENING state.
L
Linus Torvalds 已提交
7482
 */
7483
static int sctp_listen_start(struct sock *sk, int backlog)
L
Linus Torvalds 已提交
7484 7485 7486
{
	struct sctp_sock *sp = sctp_sk(sk);
	struct sctp_endpoint *ep = sp->ep;
H
Herbert Xu 已提交
7487
	struct crypto_shash *tfm = NULL;
7488
	char alg[32];
L
Linus Torvalds 已提交
7489

7490
	/* Allocate HMAC for generating cookie. */
7491 7492
	if (!sp->hmac && sp->sctp_hmac_alg) {
		sprintf(alg, "hmac(%s)", sp->sctp_hmac_alg);
H
Herbert Xu 已提交
7493
		tfm = crypto_alloc_shash(alg, 0, 0);
7494
		if (IS_ERR(tfm)) {
7495
			net_info_ratelimited("failed to load transform for %s: %ld\n",
7496
					     sp->sctp_hmac_alg, PTR_ERR(tfm));
7497 7498 7499
			return -ENOSYS;
		}
		sctp_sk(sk)->hmac = tfm;
L
Linus Torvalds 已提交
7500 7501 7502 7503 7504 7505 7506 7507 7508 7509 7510
	}

	/*
	 * If a bind() or sctp_bindx() is not called prior to a listen()
	 * call that allows new associations to be accepted, the system
	 * picks an ephemeral port and will choose an address set equivalent
	 * to binding with a wildcard address.
	 *
	 * This is not currently spelled out in the SCTP sockets
	 * extensions draft, but follows the practice as seen in TCP
	 * sockets.
7511
	 *
L
Linus Torvalds 已提交
7512
	 */
7513
	inet_sk_set_state(sk, SCTP_SS_LISTENING);
L
Linus Torvalds 已提交
7514 7515 7516
	if (!ep->base.bind_addr.port) {
		if (sctp_autobind(sk))
			return -EAGAIN;
7517
	} else {
E
Eric Dumazet 已提交
7518
		if (sctp_get_port(sk, inet_sk(sk)->inet_num)) {
7519
			inet_sk_set_state(sk, SCTP_SS_CLOSED);
7520 7521 7522
			return -EADDRINUSE;
		}
	}
7523

L
Linus Torvalds 已提交
7524 7525 7526 7527 7528 7529
	sk->sk_max_ack_backlog = backlog;
	sctp_hash_endpoint(ep);
	return 0;
}

/*
7530 7531 7532 7533 7534 7535 7536 7537 7538 7539 7540
 * 4.1.3 / 5.1.3 listen()
 *
 *   By default, new associations are not accepted for UDP style sockets.
 *   An application uses listen() to mark a socket as being able to
 *   accept new associations.
 *
 *   On TCP style sockets, applications use listen() to ready the SCTP
 *   endpoint for accepting inbound associations.
 *
 *   On both types of endpoints a backlog of '0' disables listening.
 *
L
Linus Torvalds 已提交
7541 7542 7543 7544 7545
 *  Move a socket to LISTENING state.
 */
int sctp_inet_listen(struct socket *sock, int backlog)
{
	struct sock *sk = sock->sk;
7546
	struct sctp_endpoint *ep = sctp_sk(sk)->ep;
L
Linus Torvalds 已提交
7547 7548 7549
	int err = -EINVAL;

	if (unlikely(backlog < 0))
7550
		return err;
L
Linus Torvalds 已提交
7551

7552
	lock_sock(sk);
L
Linus Torvalds 已提交
7553

7554 7555 7556 7557
	/* Peeled-off sockets are not allowed to listen().  */
	if (sctp_style(sk, UDP_HIGH_BANDWIDTH))
		goto out;

L
Linus Torvalds 已提交
7558 7559 7560
	if (sock->state != SS_UNCONNECTED)
		goto out;

7561 7562 7563
	if (!sctp_sstate(sk, LISTENING) && !sctp_sstate(sk, CLOSED))
		goto out;

7564 7565 7566
	/* If backlog is zero, disable listening. */
	if (!backlog) {
		if (sctp_sstate(sk, CLOSED))
L
Linus Torvalds 已提交
7567 7568
			goto out;

7569 7570 7571 7572 7573 7574
		err = 0;
		sctp_unhash_endpoint(ep);
		sk->sk_state = SCTP_SS_CLOSED;
		if (sk->sk_reuse)
			sctp_sk(sk)->bind_hash->fastreuse = 1;
		goto out;
7575 7576
	}

7577 7578 7579 7580 7581 7582 7583 7584
	/* If we are already listening, just update the backlog */
	if (sctp_sstate(sk, LISTENING))
		sk->sk_max_ack_backlog = backlog;
	else {
		err = sctp_listen_start(sk, backlog);
		if (err)
			goto out;
	}
L
Linus Torvalds 已提交
7585

7586
	err = 0;
L
Linus Torvalds 已提交
7587
out:
7588
	release_sock(sk);
L
Linus Torvalds 已提交
7589 7590 7591 7592 7593 7594 7595 7596
	return err;
}

/*
 * This function is done by modeling the current datagram_poll() and the
 * tcp_poll().  Note that, based on these implementations, we don't
 * lock the socket in this function, even though it seems that,
 * ideally, locking or some other mechanisms can be used to ensure
7597
 * the integrity of the counters (sndbuf and wmem_alloc) used
L
Linus Torvalds 已提交
7598 7599 7600 7601 7602 7603 7604
 * in this place.  We assume that we don't need locks either until proven
 * otherwise.
 *
 * Another thing to note is that we include the Async I/O support
 * here, again, by modeling the current TCP/UDP code.  We don't have
 * a good way to test with it yet.
 */
A
Al Viro 已提交
7605
__poll_t sctp_poll(struct file *file, struct socket *sock, poll_table *wait)
L
Linus Torvalds 已提交
7606 7607 7608
{
	struct sock *sk = sock->sk;
	struct sctp_sock *sp = sctp_sk(sk);
A
Al Viro 已提交
7609
	__poll_t mask;
L
Linus Torvalds 已提交
7610

E
Eric Dumazet 已提交
7611
	poll_wait(file, sk_sleep(sk), wait);
L
Linus Torvalds 已提交
7612

7613 7614
	sock_rps_record_flow(sk);

L
Linus Torvalds 已提交
7615 7616 7617 7618 7619
	/* A TCP-style listening socket becomes readable when the accept queue
	 * is not empty.
	 */
	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))
		return (!list_empty(&sp->ep->asocs)) ?
7620
			(EPOLLIN | EPOLLRDNORM) : 0;
L
Linus Torvalds 已提交
7621 7622 7623 7624 7625

	mask = 0;

	/* Is there any exceptional events?  */
	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
7626 7627
		mask |= EPOLLERR |
			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
7628
	if (sk->sk_shutdown & RCV_SHUTDOWN)
7629
		mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
L
Linus Torvalds 已提交
7630
	if (sk->sk_shutdown == SHUTDOWN_MASK)
7631
		mask |= EPOLLHUP;
L
Linus Torvalds 已提交
7632 7633

	/* Is it readable?  Reconsider this code with TCP-style support.  */
E
Eric Dumazet 已提交
7634
	if (!skb_queue_empty(&sk->sk_receive_queue))
7635
		mask |= EPOLLIN | EPOLLRDNORM;
L
Linus Torvalds 已提交
7636 7637 7638 7639 7640 7641 7642

	/* The association is either gone or not ready.  */
	if (!sctp_style(sk, UDP) && sctp_sstate(sk, CLOSED))
		return mask;

	/* Is it writable?  */
	if (sctp_writeable(sk)) {
7643
		mask |= EPOLLOUT | EPOLLWRNORM;
L
Linus Torvalds 已提交
7644
	} else {
7645
		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
L
Linus Torvalds 已提交
7646 7647 7648 7649 7650 7651 7652 7653 7654
		/*
		 * Since the socket is not locked, the buffer
		 * might be made available after the writeable check and
		 * before the bit is set.  This could cause a lost I/O
		 * signal.  tcp_poll() has a race breaker for this race
		 * condition.  Based on their implementation, we put
		 * in the following code to cover it as well.
		 */
		if (sctp_writeable(sk))
7655
			mask |= EPOLLOUT | EPOLLWRNORM;
L
Linus Torvalds 已提交
7656 7657 7658 7659 7660 7661 7662 7663 7664
	}
	return mask;
}

/********************************************************************
 * 2nd Level Abstractions
 ********************************************************************/

static struct sctp_bind_bucket *sctp_bucket_create(
7665
	struct sctp_bind_hashbucket *head, struct net *net, unsigned short snum)
L
Linus Torvalds 已提交
7666 7667 7668
{
	struct sctp_bind_bucket *pp;

7669
	pp = kmem_cache_alloc(sctp_bucket_cachep, GFP_ATOMIC);
L
Linus Torvalds 已提交
7670
	if (pp) {
7671
		SCTP_DBG_OBJCNT_INC(bind_bucket);
L
Linus Torvalds 已提交
7672 7673 7674
		pp->port = snum;
		pp->fastreuse = 0;
		INIT_HLIST_HEAD(&pp->owner);
7675
		pp->net = net;
7676
		hlist_add_head(&pp->node, &head->chain);
L
Linus Torvalds 已提交
7677 7678 7679 7680 7681 7682 7683
	}
	return pp;
}

/* Caller must hold hashbucket lock for this tb with local BH disabled */
static void sctp_bucket_destroy(struct sctp_bind_bucket *pp)
{
7684
	if (pp && hlist_empty(&pp->owner)) {
7685
		__hlist_del(&pp->node);
L
Linus Torvalds 已提交
7686 7687 7688 7689 7690 7691 7692 7693 7694
		kmem_cache_free(sctp_bucket_cachep, pp);
		SCTP_DBG_OBJCNT_DEC(bind_bucket);
	}
}

/* Release this socket's reference to a local port.  */
static inline void __sctp_put_port(struct sock *sk)
{
	struct sctp_bind_hashbucket *head =
7695 7696
		&sctp_port_hashtable[sctp_phashfn(sock_net(sk),
						  inet_sk(sk)->inet_num)];
L
Linus Torvalds 已提交
7697 7698
	struct sctp_bind_bucket *pp;

7699
	spin_lock(&head->lock);
L
Linus Torvalds 已提交
7700 7701 7702
	pp = sctp_sk(sk)->bind_hash;
	__sk_del_bind_node(sk);
	sctp_sk(sk)->bind_hash = NULL;
E
Eric Dumazet 已提交
7703
	inet_sk(sk)->inet_num = 0;
L
Linus Torvalds 已提交
7704
	sctp_bucket_destroy(pp);
7705
	spin_unlock(&head->lock);
L
Linus Torvalds 已提交
7706 7707 7708 7709
}

void sctp_put_port(struct sock *sk)
{
7710
	local_bh_disable();
L
Linus Torvalds 已提交
7711
	__sctp_put_port(sk);
7712
	local_bh_enable();
L
Linus Torvalds 已提交
7713 7714 7715 7716 7717 7718 7719 7720 7721 7722 7723 7724
}

/*
 * The system picks an ephemeral port and choose an address set equivalent
 * to binding with a wildcard address.
 * One of those addresses will be the primary address for the association.
 * This automatically enables the multihoming capability of SCTP.
 */
static int sctp_autobind(struct sock *sk)
{
	union sctp_addr autoaddr;
	struct sctp_af *af;
A
Al Viro 已提交
7725
	__be16 port;
L
Linus Torvalds 已提交
7726 7727 7728 7729

	/* Initialize a local sockaddr structure to INADDR_ANY. */
	af = sctp_sk(sk)->pf->af;

E
Eric Dumazet 已提交
7730
	port = htons(inet_sk(sk)->inet_num);
L
Linus Torvalds 已提交
7731 7732 7733 7734 7735 7736 7737 7738 7739 7740 7741 7742 7743 7744 7745 7746 7747 7748 7749 7750 7751 7752 7753 7754 7755 7756 7757 7758 7759 7760 7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772 7773 7774
	af->inaddr_any(&autoaddr, port);

	return sctp_do_bind(sk, &autoaddr, af->sockaddr_len);
}

/* Parse out IPPROTO_SCTP CMSG headers.  Perform only minimal validation.
 *
 * From RFC 2292
 * 4.2 The cmsghdr Structure *
 *
 * When ancillary data is sent or received, any number of ancillary data
 * objects can be specified by the msg_control and msg_controllen members of
 * the msghdr structure, because each object is preceded by
 * a cmsghdr structure defining the object's length (the cmsg_len member).
 * Historically Berkeley-derived implementations have passed only one object
 * at a time, but this API allows multiple objects to be
 * passed in a single call to sendmsg() or recvmsg(). The following example
 * shows two ancillary data objects in a control buffer.
 *
 *   |<--------------------------- msg_controllen -------------------------->|
 *   |                                                                       |
 *
 *   |<----- ancillary data object ----->|<----- ancillary data object ----->|
 *
 *   |<---------- CMSG_SPACE() --------->|<---------- CMSG_SPACE() --------->|
 *   |                                   |                                   |
 *
 *   |<---------- cmsg_len ---------->|  |<--------- cmsg_len ----------->|  |
 *
 *   |<--------- CMSG_LEN() --------->|  |<-------- CMSG_LEN() ---------->|  |
 *   |                                |  |                                |  |
 *
 *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
 *   |cmsg_|cmsg_|cmsg_|XX|           |XX|cmsg_|cmsg_|cmsg_|XX|           |XX|
 *
 *   |len  |level|type |XX|cmsg_data[]|XX|len  |level|type |XX|cmsg_data[]|XX|
 *
 *   +-----+-----+-----+--+-----------+--+-----+-----+-----+--+-----------+--+
 *    ^
 *    |
 *
 * msg_control
 * points here
 */
X
Xin Long 已提交
7775
static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
L
Linus Torvalds 已提交
7776
{
7777
	struct msghdr *my_msg = (struct msghdr *)msg;
X
Xin Long 已提交
7778
	struct cmsghdr *cmsg;
L
Linus Torvalds 已提交
7779

7780
	for_each_cmsghdr(cmsg, my_msg) {
7781
		if (!CMSG_OK(my_msg, cmsg))
L
Linus Torvalds 已提交
7782 7783 7784 7785 7786 7787 7788 7789 7790 7791
			return -EINVAL;

		/* Should we parse this header or ignore?  */
		if (cmsg->cmsg_level != IPPROTO_SCTP)
			continue;

		/* Strictly check lengths following example in SCM code.  */
		switch (cmsg->cmsg_type) {
		case SCTP_INIT:
			/* SCTP Socket API Extension
7792
			 * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
L
Linus Torvalds 已提交
7793 7794 7795 7796 7797 7798 7799 7800 7801 7802 7803
			 *
			 * This cmsghdr structure provides information for
			 * initializing new SCTP associations with sendmsg().
			 * The SCTP_INITMSG socket option uses this same data
			 * structure.  This structure is not used for
			 * recvmsg().
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ----------------------
			 * IPPROTO_SCTP  SCTP_INIT      struct sctp_initmsg
			 */
7804
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
L
Linus Torvalds 已提交
7805
				return -EINVAL;
7806 7807

			cmsgs->init = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7808 7809 7810 7811
			break;

		case SCTP_SNDRCV:
			/* SCTP Socket API Extension
7812
			 * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
L
Linus Torvalds 已提交
7813 7814 7815 7816 7817 7818 7819 7820 7821
			 *
			 * This cmsghdr structure specifies SCTP options for
			 * sendmsg() and describes SCTP header information
			 * about a received message through recvmsg().
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ----------------------
			 * IPPROTO_SCTP  SCTP_SNDRCV    struct sctp_sndrcvinfo
			 */
7822
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
L
Linus Torvalds 已提交
7823 7824
				return -EINVAL;

7825
			cmsgs->srinfo = CMSG_DATA(cmsg);
L
Linus Torvalds 已提交
7826

7827
			if (cmsgs->srinfo->sinfo_flags &
7828
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7829 7830
			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
L
Linus Torvalds 已提交
7831 7832 7833
				return -EINVAL;
			break;

7834 7835 7836 7837 7838 7839 7840 7841 7842 7843 7844 7845 7846 7847 7848 7849 7850 7851 7852
		case SCTP_SNDINFO:
			/* SCTP Socket API Extension
			 * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
			 *
			 * This cmsghdr structure specifies SCTP options for
			 * sendmsg(). This structure and SCTP_RCVINFO replaces
			 * SCTP_SNDRCV which has been deprecated.
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ---------------------
			 * IPPROTO_SCTP  SCTP_SNDINFO    struct sctp_sndinfo
			 */
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
				return -EINVAL;

			cmsgs->sinfo = CMSG_DATA(cmsg);

			if (cmsgs->sinfo->snd_flags &
			    ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
7853 7854
			      SCTP_SACK_IMMEDIATELY | SCTP_SENDALL |
			      SCTP_PR_SCTP_MASK | SCTP_ABORT | SCTP_EOF))
7855 7856
				return -EINVAL;
			break;
7857 7858 7859 7860 7861 7862 7863 7864 7865 7866 7867 7868 7869 7870 7871 7872 7873 7874 7875 7876
		case SCTP_PRINFO:
			/* SCTP Socket API Extension
			 * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
			 *
			 * This cmsghdr structure specifies SCTP options for sendmsg().
			 *
			 * cmsg_level    cmsg_type      cmsg_data[]
			 * ------------  ------------   ---------------------
			 * IPPROTO_SCTP  SCTP_PRINFO    struct sctp_prinfo
			 */
			if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
				return -EINVAL;

			cmsgs->prinfo = CMSG_DATA(cmsg);
			if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
				return -EINVAL;

			if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
				cmsgs->prinfo->pr_value = 0;
			break;
7877 7878 7879 7880 7881 7882 7883 7884 7885 7886 7887 7888 7889 7890 7891
		case SCTP_DSTADDRV4:
		case SCTP_DSTADDRV6:
			/* SCTP Socket API Extension
			 * 5.3.9/10 SCTP Destination IPv4/6 Address Structure (SCTP_DSTADDRV4/6)
			 *
			 * This cmsghdr structure specifies SCTP options for sendmsg().
			 *
			 * cmsg_level    cmsg_type         cmsg_data[]
			 * ------------  ------------   ---------------------
			 * IPPROTO_SCTP  SCTP_DSTADDRV4 struct in_addr
			 * ------------  ------------   ---------------------
			 * IPPROTO_SCTP  SCTP_DSTADDRV6 struct in6_addr
			 */
			cmsgs->addrs_msg = my_msg;
			break;
L
Linus Torvalds 已提交
7892 7893
		default:
			return -EINVAL;
7894
		}
L
Linus Torvalds 已提交
7895
	}
7896

L
Linus Torvalds 已提交
7897 7898 7899 7900 7901 7902 7903 7904
	return 0;
}

/*
 * Wait for a packet..
 * Note: This function is the same function as in core/datagram.c
 * with a few modifications to make lksctp work.
 */
7905
static int sctp_wait_for_packet(struct sock *sk, int *err, long *timeo_p)
L
Linus Torvalds 已提交
7906 7907 7908 7909
{
	int error;
	DEFINE_WAIT(wait);

E
Eric Dumazet 已提交
7910
	prepare_to_wait_exclusive(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 7921 7922 7923 7924 7925 7926 7927 7928 7929 7930 7931 7932 7933 7934 7935 7936 7937 7938 7939 7940 7941

	/* Socket errors? */
	error = sock_error(sk);
	if (error)
		goto out;

	if (!skb_queue_empty(&sk->sk_receive_queue))
		goto ready;

	/* Socket shut down?  */
	if (sk->sk_shutdown & RCV_SHUTDOWN)
		goto out;

	/* Sequenced packets can come disconnected.  If so we report the
	 * problem.
	 */
	error = -ENOTCONN;

	/* Is there a good reason to think that we may receive some data?  */
	if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
		goto out;

	/* Handle signals.  */
	if (signal_pending(current))
		goto interrupted;

	/* Let another process have a go.  Since we are going to sleep
	 * anyway.  Note: This may cause odd behaviors if the message
	 * does not fit in the user's buffer, but this seems to be the
	 * only way to honor MSG_DONTWAIT realistically.
	 */
7942
	release_sock(sk);
L
Linus Torvalds 已提交
7943
	*timeo_p = schedule_timeout(*timeo_p);
7944
	lock_sock(sk);
L
Linus Torvalds 已提交
7945 7946

ready:
E
Eric Dumazet 已提交
7947
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7948 7949 7950 7951 7952 7953
	return 0;

interrupted:
	error = sock_intr_errno(*timeo_p);

out:
E
Eric Dumazet 已提交
7954
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
7955 7956 7957 7958 7959 7960 7961 7962
	*err = error;
	return error;
}

/* Receive a datagram.
 * Note: This is pretty much the same routine as in core/datagram.c
 * with a few changes to make lksctp work.
 */
7963 7964
struct sk_buff *sctp_skb_recv_datagram(struct sock *sk, int flags,
				       int noblock, int *err)
L
Linus Torvalds 已提交
7965 7966 7967 7968 7969 7970 7971
{
	int error;
	struct sk_buff *skb;
	long timeo;

	timeo = sock_rcvtimeo(sk, noblock);

7972 7973
	pr_debug("%s: timeo:%ld, max:%ld\n", __func__, timeo,
		 MAX_SCHEDULE_TIMEOUT);
L
Linus Torvalds 已提交
7974 7975 7976 7977 7978 7979 7980

	do {
		/* Again only user level code calls this function,
		 * so nothing interrupt level
		 * will suddenly eat the receive_queue.
		 *
		 *  Look at current nfs client by the way...
7981
		 *  However, this function was correct in any case. 8)
L
Linus Torvalds 已提交
7982 7983 7984 7985
		 */
		if (flags & MSG_PEEK) {
			skb = skb_peek(&sk->sk_receive_queue);
			if (skb)
7986
				refcount_inc(&skb->users);
L
Linus Torvalds 已提交
7987
		} else {
7988
			skb = __skb_dequeue(&sk->sk_receive_queue);
L
Linus Torvalds 已提交
7989 7990 7991 7992 7993
		}

		if (skb)
			return skb;

7994 7995 7996 7997 7998
		/* Caller is allowed not to check sk->sk_err before calling. */
		error = sock_error(sk);
		if (error)
			goto no_packet;

L
Linus Torvalds 已提交
7999 8000 8001
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;

8002 8003 8004 8005 8006 8007
		if (sk_can_busy_loop(sk)) {
			sk_busy_loop(sk, noblock);

			if (!skb_queue_empty(&sk->sk_receive_queue))
				continue;
		}
8008

L
Linus Torvalds 已提交
8009 8010 8011 8012 8013 8014 8015 8016 8017 8018 8019 8020 8021 8022 8023 8024 8025 8026
		/* User doesn't want to wait.  */
		error = -EAGAIN;
		if (!timeo)
			goto no_packet;
	} while (sctp_wait_for_packet(sk, err, &timeo) == 0);

	return NULL;

no_packet:
	*err = error;
	return NULL;
}

/* If sndbuf has changed, wake up per association sndbuf waiters.  */
static void __sctp_write_space(struct sctp_association *asoc)
{
	struct sock *sk = asoc->base.sk;

8027 8028 8029 8030 8031
	if (sctp_wspace(asoc) <= 0)
		return;

	if (waitqueue_active(&asoc->wait))
		wake_up_interruptible(&asoc->wait);
L
Linus Torvalds 已提交
8032

8033 8034
	if (sctp_writeable(sk)) {
		struct socket_wq *wq;
8035

8036 8037 8038 8039 8040
		rcu_read_lock();
		wq = rcu_dereference(sk->sk_wq);
		if (wq) {
			if (waitqueue_active(&wq->wait))
				wake_up_interruptible(&wq->wait);
L
Linus Torvalds 已提交
8041 8042 8043 8044 8045

			/* Note that we try to include the Async I/O support
			 * here by modeling from the current TCP/UDP code.
			 * We have not tested with it yet.
			 */
8046
			if (!(sk->sk_shutdown & SEND_SHUTDOWN))
8047
				sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
8048
		}
8049
		rcu_read_unlock();
L
Linus Torvalds 已提交
8050 8051 8052
	}
}

8053 8054 8055 8056 8057 8058 8059 8060 8061 8062 8063
static void sctp_wake_up_waiters(struct sock *sk,
				 struct sctp_association *asoc)
{
	struct sctp_association *tmp = asoc;

	/* We do accounting for the sndbuf space per association,
	 * so we only need to wake our own association.
	 */
	if (asoc->ep->sndbuf_policy)
		return __sctp_write_space(asoc);

8064 8065 8066 8067 8068 8069
	/* If association goes down and is just flushing its
	 * outq, then just normally notify others.
	 */
	if (asoc->base.dead)
		return sctp_write_space(sk);

8070 8071 8072 8073 8074 8075 8076 8077 8078 8079 8080 8081 8082 8083 8084 8085 8086 8087 8088 8089 8090 8091 8092
	/* Accounting for the sndbuf space is per socket, so we
	 * need to wake up others, try to be fair and in case of
	 * other associations, let them have a go first instead
	 * of just doing a sctp_write_space() call.
	 *
	 * Note that we reach sctp_wake_up_waiters() only when
	 * associations free up queued chunks, thus we are under
	 * lock and the list of associations on a socket is
	 * guaranteed not to change.
	 */
	for (tmp = list_next_entry(tmp, asocs); 1;
	     tmp = list_next_entry(tmp, asocs)) {
		/* Manually skip the head element. */
		if (&tmp->asocs == &((sctp_sk(sk))->ep->asocs))
			continue;
		/* Wake up association. */
		__sctp_write_space(tmp);
		/* We've reached the end. */
		if (tmp == asoc)
			break;
	}
}

L
Linus Torvalds 已提交
8093 8094 8095 8096 8097 8098
/* Do accounting for the sndbuf space.
 * Decrement the used sndbuf space of the corresponding association by the
 * data size which was just transmitted(freed).
 */
static void sctp_wfree(struct sk_buff *skb)
{
8099 8100 8101
	struct sctp_chunk *chunk = skb_shinfo(skb)->destructor_arg;
	struct sctp_association *asoc = chunk->asoc;
	struct sock *sk = asoc->base.sk;
L
Linus Torvalds 已提交
8102

8103 8104 8105 8106
	asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) +
				sizeof(struct sk_buff) +
				sizeof(struct sctp_chunk);

8107
	WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc));
8108

8109
	/*
8110
	 * This undoes what is done via sctp_set_owner_w and sk_mem_charge
8111 8112
	 */
	sk->sk_wmem_queued   -= skb->truesize;
8113
	sk_mem_uncharge(sk, skb->truesize);
8114

X
Xin Long 已提交
8115 8116 8117
	if (chunk->shkey)
		sctp_auth_shkey_release(chunk->shkey);

8118
	sock_wfree(skb);
8119
	sctp_wake_up_waiters(sk, asoc);
L
Linus Torvalds 已提交
8120 8121 8122 8123

	sctp_association_put(asoc);
}

8124 8125 8126 8127 8128 8129 8130 8131 8132 8133 8134
/* Do accounting for the receive space on the socket.
 * Accounting for the association is done in ulpevent.c
 * We set this as a destructor for the cloned data skbs so that
 * accounting is done at the correct time.
 */
void sctp_sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
	struct sctp_ulpevent *event = sctp_skb2event(skb);

	atomic_sub(event->rmem_len, &sk->sk_rmem_alloc);
8135 8136

	/*
8137
	 * Mimic the behavior of sock_rfree
8138
	 */
8139
	sk_mem_uncharge(sk, event->rmem_len);
8140 8141 8142
}


L
Linus Torvalds 已提交
8143 8144
/* Helper function to wait for space in the sndbuf.  */
static int sctp_wait_for_sndbuf(struct sctp_association *asoc, long *timeo_p,
8145
				size_t msg_len)
L
Linus Torvalds 已提交
8146 8147 8148 8149
{
	struct sock *sk = asoc->base.sk;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);
8150
	int err = 0;
L
Linus Torvalds 已提交
8151

8152 8153
	pr_debug("%s: asoc:%p, timeo:%ld, msg_len:%zu\n", __func__, asoc,
		 *timeo_p, msg_len);
L
Linus Torvalds 已提交
8154 8155 8156 8157 8158 8159 8160 8161

	/* Increment the association's refcnt.  */
	sctp_association_hold(asoc);

	/* Wait on the association specific sndbuf space. */
	for (;;) {
		prepare_to_wait_exclusive(&asoc->wait, &wait,
					  TASK_INTERRUPTIBLE);
8162 8163
		if (asoc->base.dead)
			goto do_dead;
L
Linus Torvalds 已提交
8164 8165
		if (!*timeo_p)
			goto do_nonblock;
8166
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING)
L
Linus Torvalds 已提交
8167 8168 8169 8170 8171 8172 8173 8174 8175
			goto do_error;
		if (signal_pending(current))
			goto do_interrupted;
		if (msg_len <= sctp_wspace(asoc))
			break;

		/* Let another process have a go.  Since we are going
		 * to sleep anyway.
		 */
8176
		release_sock(sk);
L
Linus Torvalds 已提交
8177
		current_timeo = schedule_timeout(current_timeo);
8178
		lock_sock(sk);
8179 8180
		if (sk != asoc->base.sk)
			goto do_error;
L
Linus Torvalds 已提交
8181 8182 8183 8184 8185 8186 8187 8188 8189 8190 8191 8192

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

8193 8194 8195 8196
do_dead:
	err = -ESRCH;
	goto out;

L
Linus Torvalds 已提交
8197 8198 8199 8200 8201 8202 8203 8204 8205 8206 8207 8208 8209
do_error:
	err = -EPIPE;
	goto out;

do_interrupted:
	err = sock_intr_errno(*timeo_p);
	goto out;

do_nonblock:
	err = -EAGAIN;
	goto out;
}

8210
void sctp_data_ready(struct sock *sk)
8211
{
8212 8213 8214 8215
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
H
Herbert Xu 已提交
8216
	if (skwq_has_sleeper(wq))
8217 8218
		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
						EPOLLRDNORM | EPOLLRDBAND);
8219
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
8220
	rcu_read_unlock();
8221 8222
}

L
Linus Torvalds 已提交
8223 8224 8225 8226 8227 8228
/* If socket sndbuf has changed, wake up all per association waiters.  */
void sctp_write_space(struct sock *sk)
{
	struct sctp_association *asoc;

	/* Wake up the tasks in each wait queue.  */
8229
	list_for_each_entry(asoc, &((sctp_sk(sk))->ep->asocs), asocs) {
L
Linus Torvalds 已提交
8230 8231 8232 8233 8234 8235
		__sctp_write_space(asoc);
	}
}

/* Is there any sndbuf space available on the socket?
 *
8236
 * Note that sk_wmem_alloc is the sum of the send buffers on all of the
L
Linus Torvalds 已提交
8237 8238 8239 8240 8241 8242 8243 8244 8245 8246 8247 8248
 * associations on the same socket.  For a UDP-style socket with
 * multiple associations, it is possible for it to be "unwriteable"
 * prematurely.  I assume that this is acceptable because
 * a premature "unwriteable" is better than an accidental "writeable" which
 * would cause an unwanted block under certain circumstances.  For the 1-1
 * UDP-style sockets or TCP-style sockets, this code should work.
 *  - Daisy
 */
static int sctp_writeable(struct sock *sk)
{
	int amt = 0;

8249
	amt = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
L
Linus Torvalds 已提交
8250 8251 8252 8253 8254 8255 8256 8257 8258 8259 8260 8261 8262 8263 8264
	if (amt < 0)
		amt = 0;
	return amt;
}

/* Wait for an association to go into ESTABLISHED state. If timeout is 0,
 * returns immediately with EINPROGRESS.
 */
static int sctp_wait_for_connect(struct sctp_association *asoc, long *timeo_p)
{
	struct sock *sk = asoc->base.sk;
	int err = 0;
	long current_timeo = *timeo_p;
	DEFINE_WAIT(wait);

8265
	pr_debug("%s: asoc:%p, timeo:%ld\n", __func__, asoc, *timeo_p);
L
Linus Torvalds 已提交
8266 8267 8268 8269 8270 8271 8272 8273 8274 8275 8276 8277 8278 8279 8280 8281 8282 8283 8284 8285 8286 8287 8288

	/* Increment the association's refcnt.  */
	sctp_association_hold(asoc);

	for (;;) {
		prepare_to_wait_exclusive(&asoc->wait, &wait,
					  TASK_INTERRUPTIBLE);
		if (!*timeo_p)
			goto do_nonblock;
		if (sk->sk_shutdown & RCV_SHUTDOWN)
			break;
		if (sk->sk_err || asoc->state >= SCTP_STATE_SHUTDOWN_PENDING ||
		    asoc->base.dead)
			goto do_error;
		if (signal_pending(current))
			goto do_interrupted;

		if (sctp_state(asoc, ESTABLISHED))
			break;

		/* Let another process have a go.  Since we are going
		 * to sleep anyway.
		 */
8289
		release_sock(sk);
L
Linus Torvalds 已提交
8290
		current_timeo = schedule_timeout(current_timeo);
8291
		lock_sock(sk);
L
Linus Torvalds 已提交
8292 8293 8294 8295 8296 8297 8298 8299 8300 8301 8302 8303 8304

		*timeo_p = current_timeo;
	}

out:
	finish_wait(&asoc->wait, &wait);

	/* Release the association's refcnt.  */
	sctp_association_put(asoc);

	return err;

do_error:
8305
	if (asoc->init_err_counter + 1 > asoc->max_init_attempts)
L
Linus Torvalds 已提交
8306 8307 8308 8309 8310 8311 8312 8313 8314 8315 8316 8317 8318 8319 8320 8321 8322 8323 8324 8325 8326 8327 8328 8329
		err = -ETIMEDOUT;
	else
		err = -ECONNREFUSED;
	goto out;

do_interrupted:
	err = sock_intr_errno(*timeo_p);
	goto out;

do_nonblock:
	err = -EINPROGRESS;
	goto out;
}

static int sctp_wait_for_accept(struct sock *sk, long timeo)
{
	struct sctp_endpoint *ep;
	int err = 0;
	DEFINE_WAIT(wait);

	ep = sctp_sk(sk)->ep;


	for (;;) {
E
Eric Dumazet 已提交
8330
		prepare_to_wait_exclusive(sk_sleep(sk), &wait,
L
Linus Torvalds 已提交
8331 8332 8333
					  TASK_INTERRUPTIBLE);

		if (list_empty(&ep->asocs)) {
8334
			release_sock(sk);
L
Linus Torvalds 已提交
8335
			timeo = schedule_timeout(timeo);
8336
			lock_sock(sk);
L
Linus Torvalds 已提交
8337 8338 8339 8340 8341 8342 8343 8344 8345 8346 8347 8348 8349 8350 8351 8352 8353 8354 8355
		}

		err = -EINVAL;
		if (!sctp_sstate(sk, LISTENING))
			break;

		err = 0;
		if (!list_empty(&ep->asocs))
			break;

		err = sock_intr_errno(timeo);
		if (signal_pending(current))
			break;

		err = -EAGAIN;
		if (!timeo)
			break;
	}

E
Eric Dumazet 已提交
8356
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8357 8358 8359 8360

	return err;
}

8361
static void sctp_wait_for_close(struct sock *sk, long timeout)
L
Linus Torvalds 已提交
8362 8363 8364 8365
{
	DEFINE_WAIT(wait);

	do {
E
Eric Dumazet 已提交
8366
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
8367 8368
		if (list_empty(&sctp_sk(sk)->ep->asocs))
			break;
8369
		release_sock(sk);
L
Linus Torvalds 已提交
8370
		timeout = schedule_timeout(timeout);
8371
		lock_sock(sk);
L
Linus Torvalds 已提交
8372 8373
	} while (!signal_pending(current) && timeout);

E
Eric Dumazet 已提交
8374
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
8375 8376
}

8377 8378 8379 8380 8381 8382 8383 8384
static void sctp_skb_set_owner_r_frag(struct sk_buff *skb, struct sock *sk)
{
	struct sk_buff *frag;

	if (!skb->data_len)
		goto done;

	/* Don't forget the fragments. */
8385
	skb_walk_frags(skb, frag)
8386 8387 8388 8389 8390 8391
		sctp_skb_set_owner_r_frag(frag, sk);

done:
	sctp_skb_set_owner_r(skb, sk);
}

8392 8393 8394 8395
void sctp_copy_sock(struct sock *newsk, struct sock *sk,
		    struct sctp_association *asoc)
{
	struct inet_sock *inet = inet_sk(sk);
J
Julia Lawall 已提交
8396
	struct inet_sock *newinet;
8397 8398 8399 8400

	newsk->sk_type = sk->sk_type;
	newsk->sk_bound_dev_if = sk->sk_bound_dev_if;
	newsk->sk_flags = sk->sk_flags;
8401
	newsk->sk_tsflags = sk->sk_tsflags;
8402 8403
	newsk->sk_no_check_tx = sk->sk_no_check_tx;
	newsk->sk_no_check_rx = sk->sk_no_check_rx;
8404 8405 8406
	newsk->sk_reuse = sk->sk_reuse;

	newsk->sk_shutdown = sk->sk_shutdown;
8407
	newsk->sk_destruct = sctp_destruct_sock;
8408 8409 8410 8411 8412 8413 8414 8415
	newsk->sk_family = sk->sk_family;
	newsk->sk_protocol = IPPROTO_SCTP;
	newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
	newsk->sk_sndbuf = sk->sk_sndbuf;
	newsk->sk_rcvbuf = sk->sk_rcvbuf;
	newsk->sk_lingertime = sk->sk_lingertime;
	newsk->sk_rcvtimeo = sk->sk_rcvtimeo;
	newsk->sk_sndtimeo = sk->sk_sndtimeo;
8416
	newsk->sk_rxhash = sk->sk_rxhash;
8417 8418 8419 8420 8421 8422

	newinet = inet_sk(newsk);

	/* Initialize sk's sport, dport, rcv_saddr and daddr for
	 * getsockname() and getpeername()
	 */
E
Eric Dumazet 已提交
8423 8424 8425 8426
	newinet->inet_sport = inet->inet_sport;
	newinet->inet_saddr = inet->inet_saddr;
	newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
	newinet->inet_dport = htons(asoc->peer.port);
8427
	newinet->pmtudisc = inet->pmtudisc;
E
Eric Dumazet 已提交
8428
	newinet->inet_id = asoc->next_tsn ^ jiffies;
8429 8430 8431 8432 8433 8434

	newinet->uc_ttl = inet->uc_ttl;
	newinet->mc_loop = 1;
	newinet->mc_ttl = 1;
	newinet->mc_index = 0;
	newinet->mc_list = NULL;
8435 8436 8437

	if (newsk->sk_flags & SK_FLAGS_TIMESTAMP)
		net_enable_timestamp();
8438 8439

	security_sk_clone(sk, newsk);
8440 8441
}

8442 8443 8444 8445 8446 8447 8448 8449 8450 8451 8452 8453 8454
static inline void sctp_copy_descendant(struct sock *sk_to,
					const struct sock *sk_from)
{
	int ancestor_size = sizeof(struct inet_sock) +
			    sizeof(struct sctp_sock) -
			    offsetof(struct sctp_sock, auto_asconf_list);

	if (sk_from->sk_family == PF_INET6)
		ancestor_size += sizeof(struct ipv6_pinfo);

	__inet_sk_copy_descendant(sk_to, sk_from, ancestor_size);
}

L
Linus Torvalds 已提交
8455 8456 8457 8458 8459
/* Populate the fields of the newsk from the oldsk and migrate the assoc
 * and its messages to the newsk.
 */
static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
			      struct sctp_association *assoc,
8460
			      enum sctp_socket_type type)
L
Linus Torvalds 已提交
8461 8462 8463 8464 8465 8466 8467
{
	struct sctp_sock *oldsp = sctp_sk(oldsk);
	struct sctp_sock *newsp = sctp_sk(newsk);
	struct sctp_bind_bucket *pp; /* hash list port iterator */
	struct sctp_endpoint *newep = newsp->ep;
	struct sk_buff *skb, *tmp;
	struct sctp_ulpevent *event;
8468
	struct sctp_bind_hashbucket *head;
L
Linus Torvalds 已提交
8469 8470 8471 8472 8473 8474 8475

	/* Migrate socket buffer sizes and all the socket level options to the
	 * new socket.
	 */
	newsk->sk_sndbuf = oldsk->sk_sndbuf;
	newsk->sk_rcvbuf = oldsk->sk_rcvbuf;
	/* Brute force copy old sctp opt. */
8476
	sctp_copy_descendant(newsk, oldsk);
L
Linus Torvalds 已提交
8477 8478 8479 8480 8481 8482 8483 8484

	/* Restore the ep value that was overwritten with the above structure
	 * copy.
	 */
	newsp->ep = newep;
	newsp->hmac = NULL;

	/* Hook this new socket in to the bind_hash list. */
8485 8486
	head = &sctp_port_hashtable[sctp_phashfn(sock_net(oldsk),
						 inet_sk(oldsk)->inet_num)];
8487
	spin_lock_bh(&head->lock);
L
Linus Torvalds 已提交
8488 8489 8490
	pp = sctp_sk(oldsk)->bind_hash;
	sk_add_bind_node(newsk, &pp->owner);
	sctp_sk(newsk)->bind_hash = pp;
E
Eric Dumazet 已提交
8491
	inet_sk(newsk)->inet_num = inet_sk(oldsk)->inet_num;
8492
	spin_unlock_bh(&head->lock);
L
Linus Torvalds 已提交
8493

8494 8495 8496
	/* Copy the bind_addr list from the original endpoint to the new
	 * endpoint so that we can handle restarts properly
	 */
8497 8498
	sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
				&oldsp->ep->base.bind_addr, GFP_KERNEL);
8499

L
Linus Torvalds 已提交
8500 8501 8502 8503 8504 8505
	/* Move any messages in the old socket's receive queue that are for the
	 * peeled off association to the new socket's receive queue.
	 */
	sctp_skb_for_each(skb, &oldsk->sk_receive_queue, tmp) {
		event = sctp_skb2event(skb);
		if (event->asoc == assoc) {
D
David S. Miller 已提交
8506
			__skb_unlink(skb, &oldsk->sk_receive_queue);
L
Linus Torvalds 已提交
8507
			__skb_queue_tail(&newsk->sk_receive_queue, skb);
8508
			sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8509 8510 8511 8512 8513 8514 8515 8516 8517 8518
		}
	}

	/* Clean up any messages pending delivery due to partial
	 * delivery.   Three cases:
	 * 1) No partial deliver;  no work.
	 * 2) Peeling off partial delivery; keep pd_lobby in new pd_lobby.
	 * 3) Peeling off non-partial delivery; move pd_lobby to receive_queue.
	 */
	skb_queue_head_init(&newsp->pd_lobby);
8519
	atomic_set(&sctp_sk(newsk)->pd_mode, assoc->ulpq.pd_mode);
L
Linus Torvalds 已提交
8520

8521
	if (atomic_read(&sctp_sk(oldsk)->pd_mode)) {
L
Linus Torvalds 已提交
8522 8523 8524 8525 8526 8527 8528 8529 8530 8531 8532 8533 8534 8535
		struct sk_buff_head *queue;

		/* Decide which queue to move pd_lobby skbs to. */
		if (assoc->ulpq.pd_mode) {
			queue = &newsp->pd_lobby;
		} else
			queue = &newsk->sk_receive_queue;

		/* Walk through the pd_lobby, looking for skbs that
		 * need moved to the new socket.
		 */
		sctp_skb_for_each(skb, &oldsp->pd_lobby, tmp) {
			event = sctp_skb2event(skb);
			if (event->asoc == assoc) {
D
David S. Miller 已提交
8536
				__skb_unlink(skb, &oldsp->pd_lobby);
L
Linus Torvalds 已提交
8537
				__skb_queue_tail(queue, skb);
8538
				sctp_skb_set_owner_r_frag(skb, newsk);
L
Linus Torvalds 已提交
8539 8540 8541 8542 8543 8544 8545
			}
		}

		/* Clear up any skbs waiting for the partial
		 * delivery to finish.
		 */
		if (assoc->ulpq.pd_mode)
8546
			sctp_clear_pd(oldsk, NULL);
L
Linus Torvalds 已提交
8547 8548 8549

	}

8550
	sctp_for_each_rx_skb(assoc, newsk, sctp_skb_set_owner_r_frag);
8551

L
Linus Torvalds 已提交
8552 8553 8554 8555 8556 8557
	/* Set the type of socket to indicate that it is peeled off from the
	 * original UDP-style socket or created with the accept() call on a
	 * TCP-style socket..
	 */
	newsp->type = type;

8558 8559 8560 8561 8562
	/* Mark the new socket "in-use" by the user so that any packets
	 * that may arrive on the association after we've moved it are
	 * queued to the backlog.  This prevents a potential race between
	 * backlog processing on the old socket and new-packet processing
	 * on the new socket.
8563 8564 8565
	 *
	 * The caller has just allocated newsk so we can guarantee that other
	 * paths won't try to lock it and then oldsk.
8566
	 */
8567
	lock_sock_nested(newsk, SINGLE_DEPTH_NESTING);
8568
	sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w);
L
Linus Torvalds 已提交
8569
	sctp_assoc_migrate(assoc, newsk);
8570
	sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w);
L
Linus Torvalds 已提交
8571 8572 8573 8574

	/* If the association on the newsk is already closed before accept()
	 * is called, set RCV_SHUTDOWN flag.
	 */
8575
	if (sctp_state(assoc, CLOSED) && sctp_style(newsk, TCP)) {
8576
		inet_sk_set_state(newsk, SCTP_SS_CLOSED);
L
Linus Torvalds 已提交
8577
		newsk->sk_shutdown |= RCV_SHUTDOWN;
8578
	} else {
8579
		inet_sk_set_state(newsk, SCTP_SS_ESTABLISHED);
8580
	}
L
Linus Torvalds 已提交
8581

8582
	release_sock(newsk);
L
Linus Torvalds 已提交
8583 8584
}

8585

L
Linus Torvalds 已提交
8586 8587 8588 8589 8590 8591 8592 8593 8594 8595 8596 8597 8598 8599 8600 8601 8602 8603 8604 8605 8606 8607
/* This proto struct describes the ULP interface for SCTP.  */
struct proto sctp_prot = {
	.name        =	"SCTP",
	.owner       =	THIS_MODULE,
	.close       =	sctp_close,
	.connect     =	sctp_connect,
	.disconnect  =	sctp_disconnect,
	.accept      =	sctp_accept,
	.ioctl       =	sctp_ioctl,
	.init        =	sctp_init_sock,
	.destroy     =	sctp_destroy_sock,
	.shutdown    =	sctp_shutdown,
	.setsockopt  =	sctp_setsockopt,
	.getsockopt  =	sctp_getsockopt,
	.sendmsg     =	sctp_sendmsg,
	.recvmsg     =	sctp_recvmsg,
	.bind        =	sctp_bind,
	.backlog_rcv =	sctp_backlog_rcv,
	.hash        =	sctp_hash,
	.unhash      =	sctp_unhash,
	.get_port    =	sctp_get_port,
	.obj_size    =  sizeof(struct sctp_sock),
8608 8609 8610 8611
	.useroffset  =  offsetof(struct sctp_sock, subscribe),
	.usersize    =  offsetof(struct sctp_sock, initmsg) -
				offsetof(struct sctp_sock, subscribe) +
				sizeof_field(struct sctp_sock, initmsg),
8612 8613 8614 8615 8616 8617
	.sysctl_mem  =  sysctl_sctp_mem,
	.sysctl_rmem =  sysctl_sctp_rmem,
	.sysctl_wmem =  sysctl_sctp_wmem,
	.memory_pressure = &sctp_memory_pressure,
	.enter_memory_pressure = sctp_enter_memory_pressure,
	.memory_allocated = &sctp_memory_allocated,
8618
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8619 8620
};

E
Eric Dumazet 已提交
8621
#if IS_ENABLED(CONFIG_IPV6)
8622

8623 8624 8625 8626 8627 8628 8629
#include <net/transp_v6.h>
static void sctp_v6_destroy_sock(struct sock *sk)
{
	sctp_destroy_sock(sk);
	inet6_destroy_sock(sk);
}

L
Linus Torvalds 已提交
8630 8631 8632 8633 8634 8635 8636 8637 8638
struct proto sctpv6_prot = {
	.name		= "SCTPv6",
	.owner		= THIS_MODULE,
	.close		= sctp_close,
	.connect	= sctp_connect,
	.disconnect	= sctp_disconnect,
	.accept		= sctp_accept,
	.ioctl		= sctp_ioctl,
	.init		= sctp_init_sock,
8639
	.destroy	= sctp_v6_destroy_sock,
L
Linus Torvalds 已提交
8640 8641 8642 8643 8644 8645 8646 8647 8648 8649 8650
	.shutdown	= sctp_shutdown,
	.setsockopt	= sctp_setsockopt,
	.getsockopt	= sctp_getsockopt,
	.sendmsg	= sctp_sendmsg,
	.recvmsg	= sctp_recvmsg,
	.bind		= sctp_bind,
	.backlog_rcv	= sctp_backlog_rcv,
	.hash		= sctp_hash,
	.unhash		= sctp_unhash,
	.get_port	= sctp_get_port,
	.obj_size	= sizeof(struct sctp6_sock),
8651 8652 8653 8654
	.useroffset	= offsetof(struct sctp6_sock, sctp.subscribe),
	.usersize	= offsetof(struct sctp6_sock, sctp.initmsg) -
				offsetof(struct sctp6_sock, sctp.subscribe) +
				sizeof_field(struct sctp6_sock, sctp.initmsg),
8655 8656 8657 8658 8659 8660
	.sysctl_mem	= sysctl_sctp_mem,
	.sysctl_rmem	= sysctl_sctp_rmem,
	.sysctl_wmem	= sysctl_sctp_wmem,
	.memory_pressure = &sctp_memory_pressure,
	.enter_memory_pressure = sctp_enter_memory_pressure,
	.memory_allocated = &sctp_memory_allocated,
8661
	.sockets_allocated = &sctp_sockets_allocated,
L
Linus Torvalds 已提交
8662
};
E
Eric Dumazet 已提交
8663
#endif /* IS_ENABLED(CONFIG_IPV6) */