tcp_ipv6.c 53.2 KB
Newer Older
L
Linus Torvalds 已提交
1 2
/*
 *	TCP over IPv6
3
 *	Linux INET6 implementation
L
Linus Torvalds 已提交
4 5
 *
 *	Authors:
6
 *	Pedro Roque		<roque@di.fc.ul.pt>
L
Linus Torvalds 已提交
7
 *
8
 *	Based on:
L
Linus Torvalds 已提交
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
 *	linux/net/ipv4/tcp.c
 *	linux/net/ipv4/tcp_input.c
 *	linux/net/ipv4/tcp_output.c
 *
 *	Fixes:
 *	Hideaki YOSHIFUJI	:	sin6_scope_id support
 *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
 *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
 *					a single port at the same time.
 *	YOSHIFUJI Hideaki @USAGI:	convert /proc/net/tcp6 to seq_file.
 *
 *	This program is free software; 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 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/jiffies.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/ipsec.h>
#include <linux/times.h>

#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>

#include <net/tcp.h>
#include <net/ndisc.h>
47
#include <net/inet6_hashtables.h>
48
#include <net/inet6_connection_sock.h>
L
Linus Torvalds 已提交
49 50 51 52 53 54 55 56 57 58
#include <net/ipv6.h>
#include <net/transp_v6.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/ip6_checksum.h>
#include <net/inet_ecn.h>
#include <net/protocol.h>
#include <net/xfrm.h>
#include <net/snmp.h>
#include <net/dsfield.h>
59
#include <net/timewait_sock.h>
60
#include <net/netdma.h>
61
#include <net/inet_common.h>
L
Linus Torvalds 已提交
62 63 64 65 66 67

#include <asm/uaccess.h>

#include <linux/proc_fs.h>
#include <linux/seq_file.h>

68 69 70 71
#include <linux/crypto.h>
#include <linux/scatterlist.h>

static void	tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
72
static void	tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
L
Linus Torvalds 已提交
73 74 75

static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);

76 77
static struct inet_connection_sock_af_ops ipv6_mapped;
static struct inet_connection_sock_af_ops ipv6_specific;
78
#ifdef CONFIG_TCP_MD5SIG
79 80
static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
81 82 83 84 85 86
#else
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
						   struct in6_addr *addr)
{
	return NULL;
}
87
#endif
L
Linus Torvalds 已提交
88 89 90 91

static void tcp_v6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
92
		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
L
Linus Torvalds 已提交
93 94 95 96
			tcp_prot.hash(sk);
			return;
		}
		local_bh_disable();
97
		__inet6_hash(sk);
L
Linus Torvalds 已提交
98 99 100 101
		local_bh_enable();
	}
}

102
static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
103 104
				   struct in6_addr *saddr,
				   struct in6_addr *daddr,
105
				   __wsum base)
L
Linus Torvalds 已提交
106 107 108 109
{
	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}

110
static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
L
Linus Torvalds 已提交
111
{
112 113
	return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
					    ipv6_hdr(skb)->saddr.s6_addr32,
114 115
					    tcp_hdr(skb)->dest,
					    tcp_hdr(skb)->source);
L
Linus Torvalds 已提交
116 117
}

118
static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
L
Linus Torvalds 已提交
119 120 121
			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
122
	struct inet_sock *inet = inet_sk(sk);
123
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
124 125 126 127 128 129 130 131
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
	struct in6_addr *saddr = NULL, *final_p = NULL, final;
	struct flowi fl;
	struct dst_entry *dst;
	int addr_type;
	int err;

132
	if (addr_len < SIN6_LEN_RFC2133)
L
Linus Torvalds 已提交
133 134
		return -EINVAL;

135
	if (usin->sin6_family != AF_INET6)
L
Linus Torvalds 已提交
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
		return(-EAFNOSUPPORT);

	memset(&fl, 0, sizeof(fl));

	if (np->sndflow) {
		fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl.fl6_flowlabel);
		if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
			struct ip6_flowlabel *flowlabel;
			flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
			if (flowlabel == NULL)
				return -EINVAL;
			ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
			fl6_sock_release(flowlabel);
		}
	}

	/*
154 155 156 157 158
	 *	connect() to INADDR_ANY means loopback (BSD'ism).
	 */

	if(ipv6_addr_any(&usin->sin6_addr))
		usin->sin6_addr.s6_addr[15] = 0x1;
L
Linus Torvalds 已提交
159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197

	addr_type = ipv6_addr_type(&usin->sin6_addr);

	if(addr_type & IPV6_ADDR_MULTICAST)
		return -ENETUNREACH;

	if (addr_type&IPV6_ADDR_LINKLOCAL) {
		if (addr_len >= sizeof(struct sockaddr_in6) &&
		    usin->sin6_scope_id) {
			/* If interface is set while binding, indices
			 * must coincide.
			 */
			if (sk->sk_bound_dev_if &&
			    sk->sk_bound_dev_if != usin->sin6_scope_id)
				return -EINVAL;

			sk->sk_bound_dev_if = usin->sin6_scope_id;
		}

		/* Connect to link-local address requires an interface */
		if (!sk->sk_bound_dev_if)
			return -EINVAL;
	}

	if (tp->rx_opt.ts_recent_stamp &&
	    !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
		tp->rx_opt.ts_recent = 0;
		tp->rx_opt.ts_recent_stamp = 0;
		tp->write_seq = 0;
	}

	ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
	np->flow_label = fl.fl6_flowlabel;

	/*
	 *	TCP over IPv4
	 */

	if (addr_type == IPV6_ADDR_MAPPED) {
198
		u32 exthdrlen = icsk->icsk_ext_hdr_len;
L
Linus Torvalds 已提交
199 200 201 202 203 204 205 206 207 208 209
		struct sockaddr_in sin;

		SOCK_DEBUG(sk, "connect: ipv4 mapped\n");

		if (__ipv6_only_sock(sk))
			return -ENETUNREACH;

		sin.sin_family = AF_INET;
		sin.sin_port = usin->sin6_port;
		sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];

210
		icsk->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
211
		sk->sk_backlog_rcv = tcp_v4_do_rcv;
212 213 214
#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
L
Linus Torvalds 已提交
215 216 217 218

		err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));

		if (err) {
219 220
			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
L
Linus Torvalds 已提交
221
			sk->sk_backlog_rcv = tcp_v6_do_rcv;
222 223 224
#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
L
Linus Torvalds 已提交
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
			goto failure;
		} else {
			ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
				      inet->saddr);
			ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
				      inet->rcv_saddr);
		}

		return err;
	}

	if (!ipv6_addr_any(&np->rcv_saddr))
		saddr = &np->rcv_saddr;

	fl.proto = IPPROTO_TCP;
	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
	ipv6_addr_copy(&fl.fl6_src,
		       (saddr ? saddr : &np->saddr));
	fl.oif = sk->sk_bound_dev_if;
	fl.fl_ip_dport = usin->sin6_port;
	fl.fl_ip_sport = inet->sport;

	if (np->opt && np->opt->srcrt) {
		struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
		ipv6_addr_copy(&final, &fl.fl6_dst);
		ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
		final_p = &final;
	}

V
Venkat Yekkirala 已提交
254 255
	security_sk_classify_flow(sk, &fl);

L
Linus Torvalds 已提交
256 257 258 259 260 261
	err = ip6_dst_lookup(sk, &dst, &fl);
	if (err)
		goto failure;
	if (final_p)
		ipv6_addr_copy(&fl.fl6_dst, final_p);

262
	if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
263 264 265 266 267
		if (err == -EREMOTE)
			err = ip6_dst_blackhole(sk, &dst, &fl);
		if (err < 0)
			goto failure;
	}
L
Linus Torvalds 已提交
268 269 270 271 272 273 274 275 276 277

	if (saddr == NULL) {
		saddr = &fl.fl6_src;
		ipv6_addr_copy(&np->rcv_saddr, saddr);
	}

	/* set the source address */
	ipv6_addr_copy(&np->saddr, saddr);
	inet->rcv_saddr = LOOPBACK4_IPV6;

H
Herbert Xu 已提交
278
	sk->sk_gso_type = SKB_GSO_TCPV6;
279
	__ip6_dst_store(sk, dst, NULL, NULL);
L
Linus Torvalds 已提交
280

281
	icsk->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
282
	if (np->opt)
283 284
		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
					  np->opt->opt_nflen);
L
Linus Torvalds 已提交
285 286 287 288 289 290

	tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);

	inet->dport = usin->sin6_port;

	tcp_set_state(sk, TCP_SYN_SENT);
291
	err = inet6_hash_connect(&tcp_death_row, sk);
L
Linus Torvalds 已提交
292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
	if (err)
		goto late_failure;

	if (!tp->write_seq)
		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
							     np->daddr.s6_addr32,
							     inet->sport,
							     inet->dport);

	err = tcp_connect(sk);
	if (err)
		goto late_failure;

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
	inet->dport = 0;
	sk->sk_route_caps = 0;
	return err;
}

static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
317
		int type, int code, int offset, __be32 info)
L
Linus Torvalds 已提交
318 319
{
	struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
320
	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
L
Linus Torvalds 已提交
321 322 323
	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
324
	struct tcp_sock *tp;
L
Linus Torvalds 已提交
325
	__u32 seq;
326
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
327

328
	sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
329
			th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
L
Linus Torvalds 已提交
330 331 332 333 334 335 336

	if (sk == NULL) {
		ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
337
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
338 339 340 341 342 343 344 345 346 347 348
		return;
	}

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
		NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);

	if (sk->sk_state == TCP_CLOSE)
		goto out;

	tp = tcp_sk(sk);
349
	seq = ntohl(th->seq);
L
Linus Torvalds 已提交
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383
	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
		NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
		goto out;
	}

	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
		struct dst_entry *dst = NULL;

		if (sock_owned_by_user(sk))
			goto out;
		if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
			goto out;

		/* icmp should have updated the destination cache entry */
		dst = __sk_dst_check(sk, np->dst_cookie);

		if (dst == NULL) {
			struct inet_sock *inet = inet_sk(sk);
			struct flowi fl;

			/* BUGGG_FUTURE: Again, it is not clear how
			   to handle rthdr case. Ignore this complexity
			   for now.
			 */
			memset(&fl, 0, sizeof(fl));
			fl.proto = IPPROTO_TCP;
			ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
			ipv6_addr_copy(&fl.fl6_src, &np->saddr);
			fl.oif = sk->sk_bound_dev_if;
			fl.fl_ip_dport = inet->dport;
			fl.fl_ip_sport = inet->sport;
V
Venkat Yekkirala 已提交
384
			security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
385 386 387 388 389 390 391 392 393 394 395 396 397 398

			if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
				sk->sk_err_soft = -err;
				goto out;
			}

			if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
				sk->sk_err_soft = -err;
				goto out;
			}

		} else
			dst_hold(dst);

399
		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
L
Linus Torvalds 已提交
400 401 402 403 404 405 406 407 408
			tcp_sync_mss(sk, dst_mtu(dst));
			tcp_simple_retransmit(sk);
		} /* else let the usual retransmit timer handle it */
		dst_release(dst);
		goto out;
	}

	icmpv6_err_convert(type, code, &err);

409
	/* Might be for an request_sock */
L
Linus Torvalds 已提交
410
	switch (sk->sk_state) {
411
		struct request_sock *req, **prev;
L
Linus Torvalds 已提交
412 413 414 415
	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

416 417
		req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
					   &hdr->saddr, inet6_iif(skb));
L
Linus Torvalds 已提交
418 419 420 421 422 423 424 425
		if (!req)
			goto out;

		/* ICMPs are not backlogged, hence we cannot get
		 * an established socket here.
		 */
		BUG_TRAP(req->sk == NULL);

426
		if (seq != tcp_rsk(req)->snt_isn) {
L
Linus Torvalds 已提交
427 428 429 430
			NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
			goto out;
		}

431
		inet_csk_reqsk_queue_drop(sk, req, prev);
L
Linus Torvalds 已提交
432 433 434 435
		goto out;

	case TCP_SYN_SENT:
	case TCP_SYN_RECV:  /* Cannot happen.
436
			       It can, it SYNs are crossed. --ANK */
L
Linus Torvalds 已提交
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
		if (!sock_owned_by_user(sk)) {
			sk->sk_err = err;
			sk->sk_error_report(sk);		/* Wake people up to see the error (see connect in sock.c) */

			tcp_done(sk);
		} else
			sk->sk_err_soft = err;
		goto out;
	}

	if (!sock_owned_by_user(sk) && np->recverr) {
		sk->sk_err = err;
		sk->sk_error_report(sk);
	} else
		sk->sk_err_soft = err;

out:
	bh_unlock_sock(sk);
	sock_put(sk);
}


459
static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
L
Linus Torvalds 已提交
460
{
461
	struct inet6_request_sock *treq = inet6_rsk(req);
L
Linus Torvalds 已提交
462 463 464 465 466
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
	struct ipv6_txoptions *opt = NULL;
	struct in6_addr * final_p = NULL, final;
	struct flowi fl;
467
	struct dst_entry *dst;
L
Linus Torvalds 已提交
468 469 470 471
	int err = -1;

	memset(&fl, 0, sizeof(fl));
	fl.proto = IPPROTO_TCP;
472 473
	ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
	ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
L
Linus Torvalds 已提交
474
	fl.fl6_flowlabel = 0;
475 476
	fl.oif = treq->iif;
	fl.fl_ip_dport = inet_rsk(req)->rmt_port;
L
Linus Torvalds 已提交
477
	fl.fl_ip_sport = inet_sk(sk)->sport;
478
	security_req_classify_flow(req, &fl);
L
Linus Torvalds 已提交
479

480 481 482 483 484 485
	opt = np->opt;
	if (opt && opt->srcrt) {
		struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
		ipv6_addr_copy(&final, &fl.fl6_dst);
		ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
		final_p = &final;
L
Linus Torvalds 已提交
486 487
	}

488 489 490 491 492 493 494 495
	err = ip6_dst_lookup(sk, &dst, &fl);
	if (err)
		goto done;
	if (final_p)
		ipv6_addr_copy(&fl.fl6_dst, final_p);
	if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
		goto done;

L
Linus Torvalds 已提交
496 497
	skb = tcp_make_synack(sk, dst, req);
	if (skb) {
498
		struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
499 500

		th->check = tcp_v6_check(th, skb->len,
501
					 &treq->loc_addr, &treq->rmt_addr,
L
Linus Torvalds 已提交
502 503
					 csum_partial((char *)th, skb->len, skb->csum));

504
		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
L
Linus Torvalds 已提交
505
		err = ip6_xmit(sk, skb, &fl, opt, 0);
506
		err = net_xmit_eval(err);
L
Linus Torvalds 已提交
507 508 509
	}

done:
510
	if (opt && opt != np->opt)
L
Linus Torvalds 已提交
511
		sock_kfree_s(sk, opt, opt->tot_len);
512
	dst_release(dst);
L
Linus Torvalds 已提交
513 514 515
	return err;
}

516 517 518 519 520 521 522 523 524 525 526 527 528 529
static inline void syn_flood_warning(struct sk_buff *skb)
{
#ifdef CONFIG_SYN_COOKIES
	if (sysctl_tcp_syncookies)
		printk(KERN_INFO
		       "TCPv6: Possible SYN flooding on port %d. "
		       "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
	else
#endif
		printk(KERN_INFO
		       "TCPv6: Possible SYN flooding on port %d. "
		       "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
}

530
static void tcp_v6_reqsk_destructor(struct request_sock *req)
L
Linus Torvalds 已提交
531
{
532 533
	if (inet6_rsk(req)->pktopts)
		kfree_skb(inet6_rsk(req)->pktopts);
L
Linus Torvalds 已提交
534 535
}

536 537 538 539 540 541 542 543 544 545 546 547 548
#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
						   struct in6_addr *addr)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	BUG_ON(tp == NULL);

	if (!tp->md5sig_info || !tp->md5sig_info->entries6)
		return NULL;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
549
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
550
			return &tp->md5sig_info->keys6[i].base;
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570
	}
	return NULL;
}

static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
						struct sock *addr_sk)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
}

static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
						      struct request_sock *req)
{
	return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
}

static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
			     char *newkey, u8 newkeylen)
{
	/* Add key to the list */
571
	struct tcp_md5sig_key *key;
572 573 574
	struct tcp_sock *tp = tcp_sk(sk);
	struct tcp6_md5sig_key *keys;

575
	key = tcp_v6_md5_do_lookup(sk, peer);
576 577
	if (key) {
		/* modify existing entry - just update that one */
578 579 580
		kfree(key->key);
		key->key = newkey;
		key->keylen = newkeylen;
581 582 583 584 585 586 587 588
	} else {
		/* reallocate new list if current one is full. */
		if (!tp->md5sig_info) {
			tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
			if (!tp->md5sig_info) {
				kfree(newkey);
				return -ENOMEM;
			}
589
			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
590
		}
591 592 593 594
		if (tcp_alloc_md5sig_pool() == NULL) {
			kfree(newkey);
			return -ENOMEM;
		}
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
		if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
			keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
				       (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);

			if (!keys) {
				tcp_free_md5sig_pool();
				kfree(newkey);
				return -ENOMEM;
			}

			if (tp->md5sig_info->entries6)
				memmove(keys, tp->md5sig_info->keys6,
					(sizeof (tp->md5sig_info->keys6[0]) *
					 tp->md5sig_info->entries6));

			kfree(tp->md5sig_info->keys6);
			tp->md5sig_info->keys6 = keys;
			tp->md5sig_info->alloced6++;
		}

		ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
			       peer);
617 618
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
		tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637

		tp->md5sig_info->entries6++;
	}
	return 0;
}

static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
			       u8 *newkey, __u8 newkeylen)
{
	return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
				 newkey, newkeylen);
}

static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	for (i = 0; i < tp->md5sig_info->entries6; i++) {
638
		if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
639
			/* Free the key */
640
			kfree(tp->md5sig_info->keys6[i].base.key);
641 642 643 644 645
			tp->md5sig_info->entries6--;

			if (tp->md5sig_info->entries6 == 0) {
				kfree(tp->md5sig_info->keys6);
				tp->md5sig_info->keys6 = NULL;
646
				tp->md5sig_info->alloced6 = 0;
647 648 649 650 651 652 653 654
			} else {
				/* shrink the database */
				if (tp->md5sig_info->entries6 != i)
					memmove(&tp->md5sig_info->keys6[i],
						&tp->md5sig_info->keys6[i+1],
						(tp->md5sig_info->entries6 - i)
						* sizeof (tp->md5sig_info->keys6[0]));
			}
655 656
			tcp_free_md5sig_pool();
			return 0;
657 658 659 660 661 662 663 664 665 666 667 668
		}
	}
	return -ENOENT;
}

static void tcp_v6_clear_md5_list (struct sock *sk)
{
	struct tcp_sock *tp = tcp_sk(sk);
	int i;

	if (tp->md5sig_info->entries6) {
		for (i = 0; i < tp->md5sig_info->entries6; i++)
669
			kfree(tp->md5sig_info->keys6[i].base.key);
670 671 672 673 674 675 676 677 678 679
		tp->md5sig_info->entries6 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys6);
	tp->md5sig_info->keys6 = NULL;
	tp->md5sig_info->alloced6 = 0;

	if (tp->md5sig_info->entries4) {
		for (i = 0; i < tp->md5sig_info->entries4; i++)
680
			kfree(tp->md5sig_info->keys4[i].base.key);
681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
		tp->md5sig_info->entries4 = 0;
		tcp_free_md5sig_pool();
	}

	kfree(tp->md5sig_info->keys4);
	tp->md5sig_info->keys4 = NULL;
	tp->md5sig_info->alloced4 = 0;
}

static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
				  int optlen)
{
	struct tcp_md5sig cmd;
	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
	u8 *newkey;

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

	if (copy_from_user(&cmd, optval, sizeof(cmd)))
		return -EFAULT;

	if (sin6->sin6_family != AF_INET6)
		return -EINVAL;

	if (!cmd.tcpm_keylen) {
		if (!tcp_sk(sk)->md5sig_info)
			return -ENOENT;
B
Brian Haley 已提交
709
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
			return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
		return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
	}

	if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
		return -EINVAL;

	if (!tcp_sk(sk)->md5sig_info) {
		struct tcp_sock *tp = tcp_sk(sk);
		struct tcp_md5sig_info *p;

		p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
		if (!p)
			return -ENOMEM;

		tp->md5sig_info = p;
726
		sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
727 728
	}

A
Arnaldo Carvalho de Melo 已提交
729
	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
730 731
	if (!newkey)
		return -ENOMEM;
B
Brian Haley 已提交
732
	if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
733 734 735 736 737 738 739 740 741
		return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
					 newkey, cmd.tcpm_keylen);
	}
	return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
}

static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				   struct in6_addr *saddr,
				   struct in6_addr *daddr,
742
				   struct tcphdr *th, unsigned int tcplen)
743 744 745 746 747 748 749
{
	struct tcp_md5sig_pool *hp;
	struct tcp6_pseudohdr *bp;
	int err;

	hp = tcp_get_md5sig_pool();
	if (!hp) {
750
		printk(KERN_WARNING "%s(): hash pool not found...\n", __func__);
751 752
		goto clear_hash_noput;
	}
753

754 755 756 757 758 759
	bp = &hp->md5_blk.ip6;

	/* 1. TCP pseudo-header (RFC2460) */
	ipv6_addr_copy(&bp->saddr, saddr);
	ipv6_addr_copy(&bp->daddr, daddr);
	bp->len = htonl(tcplen);
760
	bp->protocol = htonl(IPPROTO_TCP);
761

762 763
	err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
				th, tcplen, hp);
764

765
	if (err)
766 767
		goto clear_hash;

768
	/* Free up the crypto pool */
769 770 771 772 773 774 775 776 777 778 779 780 781 782
	tcp_put_md5sig_pool();
out:
	return 0;
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	goto out;
}

static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
				struct sock *sk,
				struct dst_entry *dst,
				struct request_sock *req,
783
				struct tcphdr *th, unsigned int tcplen)
784 785 786 787 788 789 790 791 792 793 794 795
{
	struct in6_addr *saddr, *daddr;

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
	} else {
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
	}
	return tcp_v6_do_calc_md5_hash(md5_hash, key,
				       saddr, daddr,
796
				       th, tcplen);
797 798 799 800 801 802
}

static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
{
	__u8 *hash_location = NULL;
	struct tcp_md5sig_key *hash_expected;
803
	struct ipv6hdr *ip6h = ipv6_hdr(skb);
804
	struct tcphdr *th = tcp_hdr(skb);
805 806 807 808
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
809
	hash_location = tcp_parse_md5sig_option(th);
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839

	/* do we have a hash as expected? */
	if (!hash_expected) {
		if (!hash_location)
			return 0;
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash NOT expected but found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	if (!hash_location) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash expected but NOT found "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}

	/* check the signature */
	genhash = tcp_v6_do_calc_md5_hash(newhash,
					  hash_expected,
					  &ip6h->saddr, &ip6h->daddr,
840
					  th, skb->len);
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
		if (net_ratelimit()) {
			printk(KERN_INFO "MD5 Hash %s for "
			       "(" NIP6_FMT ", %u)->"
			       "(" NIP6_FMT ", %u)\n",
			       genhash ? "failed" : "mismatch",
			       NIP6(ip6h->saddr), ntohs(th->source),
			       NIP6(ip6h->daddr), ntohs(th->dest));
		}
		return 1;
	}
	return 0;
}
#endif

856
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
857
	.family		=	AF_INET6,
858
	.obj_size	=	sizeof(struct tcp6_request_sock),
L
Linus Torvalds 已提交
859
	.rtx_syn_ack	=	tcp_v6_send_synack,
860 861
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
L
Linus Torvalds 已提交
862 863 864
	.send_reset	=	tcp_v6_send_reset
};

865
#ifdef CONFIG_TCP_MD5SIG
866
static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
867 868
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
};
869
#endif
870

871 872 873
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
874
	.twsk_destructor= tcp_twsk_destructor,
875 876
};

877
static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
L
Linus Torvalds 已提交
878 879
{
	struct ipv6_pinfo *np = inet6_sk(sk);
880
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
881

882
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
L
Linus Torvalds 已提交
883
		th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
884
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
885
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
886
	} else {
887 888
		th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
					    csum_partial((char *)th, th->doff<<2,
L
Linus Torvalds 已提交
889 890 891 892
							 skb->csum));
	}
}

893 894 895 896 897 898 899 900
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
	struct ipv6hdr *ipv6h;
	struct tcphdr *th;

	if (!pskb_may_pull(skb, sizeof(*th)))
		return -EINVAL;

901
	ipv6h = ipv6_hdr(skb);
902
	th = tcp_hdr(skb);
903 904 905 906

	th->check = 0;
	th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
				     IPPROTO_TCP, 0);
907
	skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
908
	skb->csum_offset = offsetof(struct tcphdr, check);
909
	skb->ip_summed = CHECKSUM_PARTIAL;
910 911
	return 0;
}
L
Linus Torvalds 已提交
912

913
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
914
{
915
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
916 917
	struct sk_buff *buff;
	struct flowi fl;
918
	struct net *net = dev_net(skb->dst->dev);
919
	struct sock *ctl_sk = net->ipv6.tcp_sk;
920
	unsigned int tot_len = sizeof(*th);
921 922 923
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
924 925 926 927 928

	if (th->rst)
		return;

	if (!ipv6_unicast_destination(skb))
929
		return;
L
Linus Torvalds 已提交
930

931 932
#ifdef CONFIG_TCP_MD5SIG
	if (sk)
933
		key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
934 935 936 937 938 939 940
	else
		key = NULL;

	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

L
Linus Torvalds 已提交
941 942 943 944 945
	/*
	 * We need to grab some memory, and put together an RST,
	 * and then put it into the queue to be sent.
	 */

946
	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
L
Linus Torvalds 已提交
947
			 GFP_ATOMIC);
948 949
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
950

951
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
952

953
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
L
Linus Torvalds 已提交
954 955 956 957 958

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
959
	t1->doff = tot_len / 4;
L
Linus Torvalds 已提交
960
	t1->rst = 1;
961

L
Linus Torvalds 已提交
962
	if(th->ack) {
963
		t1->seq = th->ack_seq;
L
Linus Torvalds 已提交
964 965 966 967 968 969
	} else {
		t1->ack = 1;
		t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
				    + skb->len - (th->doff<<2));
	}

970 971
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
972
		__be32 *opt = (__be32*)(t1 + 1);
973 974 975 976
		opt[0] = htonl((TCPOPT_NOP << 24) |
			       (TCPOPT_NOP << 16) |
			       (TCPOPT_MD5SIG << 8) |
			       TCPOLEN_MD5SIG);
977 978 979
		tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
					&ipv6_hdr(skb)->daddr,
					&ipv6_hdr(skb)->saddr,
980
					t1, tot_len);
981 982 983
	}
#endif

L
Linus Torvalds 已提交
984 985 986
	buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);

	memset(&fl, 0, sizeof(fl));
987 988
	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
L
Linus Torvalds 已提交
989 990 991 992 993 994

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    sizeof(*t1), IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
995
	fl.oif = inet6_iif(skb);
L
Linus Torvalds 已提交
996 997
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
V
Venkat Yekkirala 已提交
998
	security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
999

1000 1001 1002 1003
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
1004
	if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
L
Linus Torvalds 已提交
1005

A
Arnaldo Carvalho de Melo 已提交
1006
		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1007
			ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1008 1009
			TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
			TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
L
Linus Torvalds 已提交
1010
			return;
A
Arnaldo Carvalho de Melo 已提交
1011
		}
L
Linus Torvalds 已提交
1012 1013 1014 1015 1016
	}

	kfree_skb(buff);
}

1017 1018
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
			    struct tcp_md5sig_key *key)
L
Linus Torvalds 已提交
1019
{
1020
	struct tcphdr *th = tcp_hdr(skb), *t1;
L
Linus Torvalds 已提交
1021 1022
	struct sk_buff *buff;
	struct flowi fl;
1023
	struct net *net = dev_net(skb->dev);
1024
	struct sock *ctl_sk = net->ipv6.tcp_sk;
1025
	unsigned int tot_len = sizeof(struct tcphdr);
A
Al Viro 已提交
1026
	__be32 *topt;
L
Linus Torvalds 已提交
1027 1028

	if (ts)
1029
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
1030 1031 1032 1033
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
L
Linus Torvalds 已提交
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
			 GFP_ATOMIC);
	if (buff == NULL)
		return;

	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);

	t1 = (struct tcphdr *) skb_push(buff,tot_len);

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
	t1->doff = tot_len/4;
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = 1;
	t1->window = htons(win);
1053

A
Al Viro 已提交
1054
	topt = (__be32 *)(t1 + 1);
1055

L
Linus Torvalds 已提交
1056
	if (ts) {
1057 1058 1059 1060
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt = htonl(ts);
L
Linus Torvalds 已提交
1061 1062
	}

1063 1064 1065 1066
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1067 1068 1069
		tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
					&ipv6_hdr(skb)->daddr,
					&ipv6_hdr(skb)->saddr,
1070
					t1, tot_len);
1071 1072 1073
	}
#endif

L
Linus Torvalds 已提交
1074 1075 1076
	buff->csum = csum_partial((char *)t1, tot_len, 0);

	memset(&fl, 0, sizeof(fl));
1077 1078
	ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
L
Linus Torvalds 已提交
1079 1080 1081 1082 1083 1084

	t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
				    tot_len, IPPROTO_TCP,
				    buff->csum);

	fl.proto = IPPROTO_TCP;
1085
	fl.oif = inet6_iif(skb);
L
Linus Torvalds 已提交
1086 1087
	fl.fl_ip_dport = t1->dest;
	fl.fl_ip_sport = t1->source;
V
Venkat Yekkirala 已提交
1088
	security_skb_classify_flow(skb, &fl);
L
Linus Torvalds 已提交
1089

1090
	if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
A
Arnaldo Carvalho de Melo 已提交
1091
		if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1092
			ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1093
			TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
L
Linus Torvalds 已提交
1094
			return;
A
Arnaldo Carvalho de Melo 已提交
1095
		}
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101 1102
	}

	kfree_skb(buff);
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
1103
	struct inet_timewait_sock *tw = inet_twsk(sk);
1104
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
1105

1106
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1107
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1108
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
L
Linus Torvalds 已提交
1109

1110
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
1111 1112
}

1113
static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
L
Linus Torvalds 已提交
1114
{
1115 1116
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
			tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr));
L
Linus Torvalds 已提交
1117 1118 1119 1120 1121
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1122
	struct request_sock *req, **prev;
1123
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1124 1125 1126
	struct sock *nsk;

	/* Find possible connection requests. */
1127
	req = inet6_csk_search_req(sk, &prev, th->source,
1128 1129
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
1130 1131 1132
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1133
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1134 1135
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1136 1137 1138 1139 1140 1141

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1142
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
1143 1144 1145
		return NULL;
	}

1146
#ifdef CONFIG_SYN_COOKIES
L
Linus Torvalds 已提交
1147
	if (!th->rst && !th->syn && th->ack)
1148
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
1149 1150 1151 1152 1153 1154 1155 1156 1157
#endif
	return sk;
}

/* FIXME: this is substantially similar to the ipv4 code.
 * Can some kind of merge be done? -- erics
 */
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
1158
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1159 1160 1161
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_options_received tmp_opt;
	struct tcp_sock *tp = tcp_sk(sk);
1162
	struct request_sock *req = NULL;
L
Linus Torvalds 已提交
1163
	__u32 isn = TCP_SKB_CB(skb)->when;
1164 1165 1166 1167 1168
#ifdef CONFIG_SYN_COOKIES
	int want_cookie = 0;
#else
#define want_cookie 0
#endif
L
Linus Torvalds 已提交
1169 1170 1171 1172 1173

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_conn_request(sk, skb);

	if (!ipv6_unicast_destination(skb))
1174
		goto drop;
L
Linus Torvalds 已提交
1175

1176
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
L
Linus Torvalds 已提交
1177
		if (net_ratelimit())
1178 1179 1180 1181 1182 1183
			syn_flood_warning(skb);
#ifdef CONFIG_SYN_COOKIES
		if (sysctl_tcp_syncookies)
			want_cookie = 1;
		else
#endif
1184
		goto drop;
L
Linus Torvalds 已提交
1185 1186
	}

1187
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1188 1189
		goto drop;

1190
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1191 1192 1193
	if (req == NULL)
		goto drop;

1194 1195 1196 1197
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1198 1199 1200 1201 1202 1203
	tcp_clear_options(&tmp_opt);
	tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
	tmp_opt.user_mss = tp->rx_opt.user_mss;

	tcp_parse_options(skb, &tmp_opt, 0);

1204
	if (want_cookie && !tmp_opt.saw_tstamp)
1205 1206
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1207 1208 1209
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1210
	treq = inet6_rsk(req);
1211 1212
	ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
	ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1213 1214 1215 1216 1217
	if (!want_cookie)
		TCP_ECN_create_request(req, tcp_hdr(skb));

	if (want_cookie) {
		isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1218
		req->cookie_ts = tmp_opt.tstamp_ok;
1219 1220 1221 1222 1223 1224 1225 1226
	} else if (!isn) {
		if (ipv6_opt_accepted(sk, skb) ||
		    np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
		    np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
			atomic_inc(&skb->users);
			treq->pktopts = skb;
		}
		treq->iif = sk->sk_bound_dev_if;
L
Linus Torvalds 已提交
1227

1228 1229 1230 1231
		/* So that link locals have meaning */
		if (!sk->sk_bound_dev_if &&
		    ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
			treq->iif = inet6_iif(skb);
L
Linus Torvalds 已提交
1232

1233
		isn = tcp_v6_init_sequence(skb);
1234
	}
L
Linus Torvalds 已提交
1235

1236
	tcp_rsk(req)->snt_isn = isn;
L
Linus Torvalds 已提交
1237

1238 1239
	security_inet_conn_request(sk, skb, req);

1240
	if (tcp_v6_send_synack(sk, req))
L
Linus Torvalds 已提交
1241 1242
		goto drop;

1243 1244 1245 1246
	if (!want_cookie) {
		inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
		return 0;
	}
L
Linus Torvalds 已提交
1247 1248 1249

drop:
	if (req)
1250
		reqsk_free(req);
L
Linus Torvalds 已提交
1251 1252 1253 1254 1255

	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1256
					  struct request_sock *req,
L
Linus Torvalds 已提交
1257 1258
					  struct dst_entry *dst)
{
1259
	struct inet6_request_sock *treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1260 1261 1262 1263 1264 1265
	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
	struct tcp6_sock *newtcp6sk;
	struct inet_sock *newinet;
	struct tcp_sock *newtp;
	struct sock *newsk;
	struct ipv6_txoptions *opt;
1266 1267 1268
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1269 1270 1271 1272 1273 1274 1275 1276

	if (skb->protocol == htons(ETH_P_IP)) {
		/*
		 *	v6 mapped
		 */

		newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);

1277
		if (newsk == NULL)
L
Linus Torvalds 已提交
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
			return NULL;

		newtcp6sk = (struct tcp6_sock *)newsk;
		inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

		newinet = inet_sk(newsk);
		newnp = inet6_sk(newsk);
		newtp = tcp_sk(newsk);

		memcpy(newnp, np, sizeof(struct ipv6_pinfo));

		ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
			      newinet->daddr);

		ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
			      newinet->saddr);

		ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);

1297
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1298
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1299 1300 1301 1302
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

L
Linus Torvalds 已提交
1303 1304
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1305
		newnp->mcast_oif   = inet6_iif(skb);
1306
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1307

1308 1309 1310 1311
		/*
		 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
		 * here, tcp_create_openreq_child now does this for us, see the comment in
		 * that function for the gory details. -acme
L
Linus Torvalds 已提交
1312 1313 1314
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1315
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1316 1317
		   Sync it now.
		 */
1318
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333

		return newsk;
	}

	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

	if (dst == NULL) {
		struct in6_addr *final_p = NULL, final;
		struct flowi fl;

		memset(&fl, 0, sizeof(fl));
		fl.proto = IPPROTO_TCP;
1334
		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
L
Linus Torvalds 已提交
1335 1336 1337 1338 1339 1340
		if (opt && opt->srcrt) {
			struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
			ipv6_addr_copy(&final, &fl.fl6_dst);
			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
			final_p = &final;
		}
1341
		ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
L
Linus Torvalds 已提交
1342
		fl.oif = sk->sk_bound_dev_if;
1343
		fl.fl_ip_dport = inet_rsk(req)->rmt_port;
L
Linus Torvalds 已提交
1344
		fl.fl_ip_sport = inet_sk(sk)->sport;
1345
		security_req_classify_flow(req, &fl);
L
Linus Torvalds 已提交
1346 1347 1348 1349 1350 1351 1352 1353 1354

		if (ip6_dst_lookup(sk, &dst, &fl))
			goto out;

		if (final_p)
			ipv6_addr_copy(&fl.fl6_dst, final_p);

		if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto out;
1355
	}
L
Linus Torvalds 已提交
1356 1357 1358 1359 1360

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
		goto out;

1361 1362 1363 1364 1365
	/*
	 * No need to charge this sock to the relevant IPv6 refcnt debug socks
	 * count here, tcp_create_openreq_child now does this for us, see the
	 * comment in that function for the gory details. -acme
	 */
L
Linus Torvalds 已提交
1366

1367
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1368
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378

	newtcp6sk = (struct tcp6_sock *)newsk;
	inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;

	newtp = tcp_sk(newsk);
	newinet = inet_sk(newsk);
	newnp = inet6_sk(newsk);

	memcpy(newnp, np, sizeof(struct ipv6_pinfo));

1379 1380 1381 1382
	ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
	ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
	ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
	newsk->sk_bound_dev_if = treq->iif;
L
Linus Torvalds 已提交
1383

1384
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1385 1386 1387 1388

	   First: no IPv4 options.
	 */
	newinet->opt = NULL;
1389
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1390 1391 1392 1393 1394 1395

	/* Clone RX bits */
	newnp->rxopt.all = np->rxopt.all;

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1396 1397 1398 1399
	if (treq->pktopts != NULL) {
		newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
		kfree_skb(treq->pktopts);
		treq->pktopts = NULL;
L
Linus Torvalds 已提交
1400 1401 1402 1403
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1404
	newnp->mcast_oif  = inet6_iif(skb);
1405
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
L
Linus Torvalds 已提交
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418

	/* Clone native IPv6 options from listening socket (if any)

	   Yes, keeping reference count would be much more clever,
	   but we make one more one thing there: reattach optmem
	   to newsk.
	 */
	if (opt) {
		newnp->opt = ipv6_dup_options(newsk, opt);
		if (opt != np->opt)
			sock_kfree_s(sk, opt, opt->tot_len);
	}

1419
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1420
	if (newnp->opt)
1421 1422
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1423

J
John Heffner 已提交
1424
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1425 1426 1427 1428 1429 1430
	tcp_sync_mss(newsk, dst_mtu(dst));
	newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
	tcp_initialize_rcv_mss(newsk);

	newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;

1431 1432 1433 1434 1435 1436 1437 1438
#ifdef CONFIG_TCP_MD5SIG
	/* Copy over the MD5 key from the original socket */
	if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
		/* We're using one, so create a matching key
		 * on the newsk structure. If we fail to get
		 * memory, then we end up not copying the key
		 * across. Shucks.
		 */
A
Arnaldo Carvalho de Melo 已提交
1439 1440
		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
		if (newkey != NULL)
1441 1442 1443 1444 1445
			tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
					  newkey, key->keylen);
	}
#endif

1446
	__inet6_hash(newsk);
1447
	__inet_inherit_port(sk, newsk);
L
Linus Torvalds 已提交
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460

	return newsk;

out_overflow:
	NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
out:
	NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
	return NULL;
}

1461
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1462
{
1463
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
1464
		if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1465
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1466
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1467
			return 0;
1468
		}
L
Linus Torvalds 已提交
1469
	}
1470

1471
	skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1472 1473
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1474

L
Linus Torvalds 已提交
1475
	if (skb->len <= 76) {
1476
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505
	}
	return 0;
}

/* The socket must have it's spinlock held when we get
 * here.
 *
 * We have a potential double-lock case here, so even when
 * doing backlog processing we use the BH locking scheme.
 * This is because we cannot sleep with the original spinlock
 * held.
 */
static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp;
	struct sk_buff *opt_skb = NULL;

	/* Imagine: socket is IPv6. IPv4 packet arrives,
	   goes to IPv4 receive handler and backlogged.
	   From backlog it always goes here. Kerboom...
	   Fortunately, tcp_rcv_established and rcv_established
	   handle them correctly, but it is not case with
	   tcp_v6_hnd_req and tcp_v6_send_reset().   --ANK
	 */

	if (skb->protocol == htons(ETH_P_IP))
		return tcp_v4_do_rcv(sk, skb);

1506 1507 1508 1509 1510
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1511
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529
		goto discard;

	/*
	 *	socket locking is here for SMP purposes as backlog rcv
	 *	is currently called with bh processing disabled.
	 */

	/* Do Stevens' IPV6_PKTOPTIONS.

	   Yes, guys, it is the only place in our code, where we
	   may make it not affecting IPv4.
	   The rest of code is protocol independent,
	   and I do not like idea to uglify IPv4.

	   Actually, all the idea behind IPV6_PKTOPTIONS
	   looks not very well thought. For now we latch
	   options, received in the last packet, enqueued
	   by tcp. Feel free to propose better solution.
1530
					       --ANK (980728)
L
Linus Torvalds 已提交
1531 1532 1533 1534 1535 1536
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
		TCP_CHECK_TIMER(sk);
1537
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1538 1539 1540 1541 1542 1543 1544
			goto reset;
		TCP_CHECK_TIMER(sk);
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1545
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1546 1547
		goto csum_err;

1548
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1549 1550 1551 1552 1553 1554 1555 1556 1557
		struct sock *nsk = tcp_v6_hnd_req(sk, skb);
		if (!nsk)
			goto discard;

		/*
		 * Queue it on the new socket if the new socket is active,
		 * otherwise we just shortcircuit this and continue with
		 * the new socket..
		 */
1558
		if(nsk != sk) {
L
Linus Torvalds 已提交
1559 1560 1561 1562 1563 1564 1565 1566 1567
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
	}

	TCP_CHECK_TIMER(sk);
1568
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1569 1570 1571 1572 1573 1574 1575
		goto reset;
	TCP_CHECK_TIMER(sk);
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1576
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1577 1578 1579 1580 1581 1582
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1583
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
	goto discard;


ipv6_pktoptions:
	/* Do you ask, what is it?

	   1. skb was enqueued by tcp.
	   2. skb is added to tail of read queue, rather than out of order.
	   3. socket is not in passive state.
	   4. Finally, it really contains options, which user wants to receive.
	 */
	tp = tcp_sk(sk);
	if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
	    !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1598
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1599
			np->mcast_oif = inet6_iif(opt_skb);
1600
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1601
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
		if (ipv6_opt_accepted(sk, opt_skb)) {
			skb_set_owner_r(opt_skb, sk);
			opt_skb = xchg(&np->pktoptions, opt_skb);
		} else {
			__kfree_skb(opt_skb);
			opt_skb = xchg(&np->pktoptions, NULL);
		}
	}

	if (opt_skb)
		kfree_skb(opt_skb);
	return 0;
}

1616
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1617
{
1618
	struct tcphdr *th;
L
Linus Torvalds 已提交
1619 1620
	struct sock *sk;
	int ret;
1621
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1622 1623 1624 1625 1626 1627 1628

	if (skb->pkt_type != PACKET_HOST)
		goto discard_it;

	/*
	 *	Count it even if it's bad.
	 */
1629
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1630 1631 1632 1633

	if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
		goto discard_it;

1634
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1635 1636 1637 1638 1639 1640

	if (th->doff < sizeof(struct tcphdr)/4)
		goto bad_packet;
	if (!pskb_may_pull(skb, th->doff*4))
		goto discard_it;

1641
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1642 1643
		goto bad_packet;

1644
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1645 1646 1647 1648 1649
	TCP_SKB_CB(skb)->seq = ntohl(th->seq);
	TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
				    skb->len - th->doff*4);
	TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
	TCP_SKB_CB(skb)->when = 0;
1650
	TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1651 1652
	TCP_SKB_CB(skb)->sacked = 0;

1653
	sk = __inet6_lookup(net, &tcp_hashinfo,
1654 1655 1656
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest),
			inet6_iif(skb));
L
Linus Torvalds 已提交
1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667

	if (!sk)
		goto no_tcp_socket;

process:
	if (sk->sk_state == TCP_TIME_WAIT)
		goto do_time_wait;

	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1668
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1669 1670 1671 1672
		goto discard_and_relse;

	skb->dev = NULL;

1673
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1674 1675
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1676
#ifdef CONFIG_NET_DMA
1677
		struct tcp_sock *tp = tcp_sk(sk);
1678 1679
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
			tp->ucopy.dma_chan = get_softnet_dma();
1680 1681 1682
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1683 1684 1685 1686 1687
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
L
Linus Torvalds 已提交
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700
	} else
		sk_add_backlog(sk, skb);
	bh_unlock_sock(sk);

	sock_put(sk);
	return ret ? -1 : 0;

no_tcp_socket:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
		goto discard_it;

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
bad_packet:
1701
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1702
	} else {
1703
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720
	}

discard_it:

	/*
	 *	Discard frame
	 */

	kfree_skb(skb);
	return 0;

discard_and_relse:
	sock_put(sk);
	goto discard_it;

do_time_wait:
	if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1721
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1722 1723 1724 1725
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1726
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1727
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1728 1729 1730
		goto discard_it;
	}

1731
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1732 1733 1734 1735
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1736
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1737
					    &ipv6_hdr(skb)->daddr,
1738
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1739
		if (sk2 != NULL) {
1740 1741 1742
			struct inet_timewait_sock *tw = inet_twsk(sk);
			inet_twsk_deschedule(tw, &tcp_death_row);
			inet_twsk_put(tw);
L
Linus Torvalds 已提交
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763
			sk = sk2;
			goto process;
		}
		/* Fall through to ACK */
	}
	case TCP_TW_ACK:
		tcp_v6_timewait_ack(sk, skb);
		break;
	case TCP_TW_RST:
		goto no_tcp_socket;
	case TCP_TW_SUCCESS:;
	}
	goto discard_it;
}

static int tcp_v6_remember_stamp(struct sock *sk)
{
	/* Alas, not yet... */
	return 0;
}

1764
static struct inet_connection_sock_af_ops ipv6_specific = {
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
	.queue_xmit	   = inet6_csk_xmit,
	.send_check	   = tcp_v6_send_check,
	.rebuild_header	   = inet6_sk_rebuild_header,
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.remember_stamp	   = tcp_v6_remember_stamp,
	.net_header_len	   = sizeof(struct ipv6hdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1776
	.bind_conflict	   = inet6_csk_bind_conflict,
1777
#ifdef CONFIG_COMPAT
1778 1779
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1780
#endif
L
Linus Torvalds 已提交
1781 1782
};

1783
#ifdef CONFIG_TCP_MD5SIG
1784
static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1785 1786 1787 1788 1789
	.md5_lookup	=	tcp_v6_md5_lookup,
	.calc_md5_hash	=	tcp_v6_calc_md5_hash,
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1790
#endif
1791

L
Linus Torvalds 已提交
1792 1793 1794 1795
/*
 *	TCP over IPv4 via INET6 API
 */

1796
static struct inet_connection_sock_af_ops ipv6_mapped = {
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
	.queue_xmit	   = ip_queue_xmit,
	.send_check	   = tcp_v4_send_check,
	.rebuild_header	   = inet_sk_rebuild_header,
	.conn_request	   = tcp_v6_conn_request,
	.syn_recv_sock	   = tcp_v6_syn_recv_sock,
	.remember_stamp	   = tcp_v4_remember_stamp,
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1808
	.bind_conflict	   = inet6_csk_bind_conflict,
1809
#ifdef CONFIG_COMPAT
1810 1811
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1812
#endif
L
Linus Torvalds 已提交
1813 1814
};

1815
#ifdef CONFIG_TCP_MD5SIG
1816
static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1817 1818 1819 1820 1821
	.md5_lookup	=	tcp_v4_md5_lookup,
	.calc_md5_hash	=	tcp_v4_calc_md5_hash,
	.md5_add	=	tcp_v6_md5_add_func,
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1822
#endif
1823

L
Linus Torvalds 已提交
1824 1825 1826 1827 1828
/* NOTE: A lot of things set to zero explicitly by call to
 *       sk_alloc() so need not be done here.
 */
static int tcp_v6_init_sock(struct sock *sk)
{
1829
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1830 1831 1832 1833 1834 1835
	struct tcp_sock *tp = tcp_sk(sk);

	skb_queue_head_init(&tp->out_of_order_queue);
	tcp_init_xmit_timers(sk);
	tcp_prequeue_init(tp);

1836
	icsk->icsk_rto = TCP_TIMEOUT_INIT;
L
Linus Torvalds 已提交
1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
	tp->mdev = TCP_TIMEOUT_INIT;

	/* So many TCP implementations out there (incorrectly) count the
	 * initial SYN frame in their delayed-ACK and congestion control
	 * algorithms that we must have the following bandaid to talk
	 * efficiently to them.  -DaveM
	 */
	tp->snd_cwnd = 2;

	/* See draft-stevens-tcpca-spec-01 for discussion of the
	 * initialization of these values.
	 */
	tp->snd_ssthresh = 0x7fffffff;
	tp->snd_cwnd_clamp = ~0;
1851
	tp->mss_cache = 536;
L
Linus Torvalds 已提交
1852 1853 1854 1855 1856

	tp->reordering = sysctl_tcp_reordering;

	sk->sk_state = TCP_CLOSE;

1857
	icsk->icsk_af_ops = &ipv6_specific;
1858
	icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1859
	icsk->icsk_sync_mss = tcp_sync_mss;
L
Linus Torvalds 已提交
1860 1861 1862
	sk->sk_write_space = sk_stream_write_space;
	sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);

1863 1864 1865 1866
#ifdef CONFIG_TCP_MD5SIG
	tp->af_specific = &tcp_sock_ipv6_specific;
#endif

L
Linus Torvalds 已提交
1867 1868 1869 1870 1871 1872 1873 1874
	sk->sk_sndbuf = sysctl_tcp_wmem[1];
	sk->sk_rcvbuf = sysctl_tcp_rmem[1];

	atomic_inc(&tcp_sockets_allocated);

	return 0;
}

1875
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
1876
{
1877 1878 1879 1880 1881
#ifdef CONFIG_TCP_MD5SIG
	/* Clean up the MD5 key list */
	if (tcp_sk(sk)->md5sig_info)
		tcp_v6_clear_md5_list(sk);
#endif
L
Linus Torvalds 已提交
1882
	tcp_v4_destroy_sock(sk);
1883
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
1884 1885
}

1886
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1887
/* Proc filesystem TCPv6 sock list dumping. */
1888
static void get_openreq6(struct seq_file *seq,
1889
			 struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
1890 1891
{
	int ttd = req->expires - jiffies;
1892 1893
	struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906

	if (ttd < 0)
		ttd = 0;

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
		   ntohs(inet_sk(sk)->sport),
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
1907
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
1908 1909
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
1910 1911
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
1912 1913
		   req->retrans,
		   uid,
1914
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
	struct in6_addr *dest, *src;
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
	struct inet_sock *inet = inet_sk(sp);
	struct tcp_sock *tp = tcp_sk(sp);
1927
	const struct inet_connection_sock *icsk = inet_csk(sp);
L
Linus Torvalds 已提交
1928 1929 1930 1931 1932 1933
	struct ipv6_pinfo *np = inet6_sk(sp);

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
	destp = ntohs(inet->dport);
	srcp  = ntohs(inet->sport);
1934 1935

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
1936
		timer_active	= 1;
1937 1938
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
1939
		timer_active	= 4;
1940
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
1941 1942 1943 1944 1945 1946 1947 1948 1949 1950
	} else if (timer_pending(&sp->sk_timer)) {
		timer_active	= 2;
		timer_expires	= sp->sk_timer.expires;
	} else {
		timer_active	= 0;
		timer_expires = jiffies;
	}

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1951
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
1952 1953 1954 1955 1956
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3], srcp,
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3], destp,
1957
		   sp->sk_state,
1958 1959
		   tp->write_seq-tp->snd_una,
		   (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
L
Linus Torvalds 已提交
1960 1961
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
1962
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
1963
		   sock_i_uid(sp),
1964
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
1965 1966
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
1967 1968
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
1969
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
L
Linus Torvalds 已提交
1970 1971 1972 1973
		   tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
		   );
}

1974
static void get_timewait6_sock(struct seq_file *seq,
1975
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
1976 1977 1978
{
	struct in6_addr *dest, *src;
	__u16 destp, srcp;
1979
	struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
1980 1981 1982 1983 1984
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

1985 1986
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
	destp = ntohs(tw->tw_dport);
	srcp  = ntohs(tw->tw_sport);

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3], srcp,
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3], destp,
		   tw->tw_substate, 0, 0,
		   3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
		   atomic_read(&tw->tw_refcnt), tw);
}

static int tcp6_seq_show(struct seq_file *seq, void *v)
{
	struct tcp_iter_state *st;

	if (v == SEQ_START_TOKEN) {
		seq_puts(seq,
			 "  sl  "
			 "local_address                         "
			 "remote_address                        "
			 "st tx_queue rx_queue tr tm->when retrnsmt"
			 "   uid  timeout inode\n");
		goto out;
	}
	st = seq->private;

	switch (st->state) {
	case TCP_SEQ_STATE_LISTENING:
	case TCP_SEQ_STATE_ESTABLISHED:
		get_tcp6_sock(seq, v, st->num);
		break;
	case TCP_SEQ_STATE_OPENREQ:
		get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
		break;
	case TCP_SEQ_STATE_TIME_WAIT:
		get_timewait6_sock(seq, v, st->num);
		break;
	}
out:
	return 0;
}

static struct tcp_seq_afinfo tcp6_seq_afinfo = {
	.name		= "tcp6",
	.family		= AF_INET6,
2037 2038 2039
	.seq_fops	= {
		.owner		= THIS_MODULE,
	},
2040 2041 2042
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
2043 2044
};

2045
int tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
2046
{
2047
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2048 2049
}

2050
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
2051
{
2052
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2053 2054 2055 2056 2057 2058 2059 2060 2061
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2062
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2063 2064 2065 2066 2067 2068 2069 2070 2071
	.ioctl			= tcp_ioctl,
	.init			= tcp_v6_init_sock,
	.destroy		= tcp_v6_destroy_sock,
	.shutdown		= tcp_shutdown,
	.setsockopt		= tcp_setsockopt,
	.getsockopt		= tcp_getsockopt,
	.recvmsg		= tcp_recvmsg,
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
2072 2073
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2074 2075 2076 2077
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2078
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2079 2080 2081 2082 2083
	.sysctl_mem		= sysctl_tcp_mem,
	.sysctl_wmem		= sysctl_tcp_wmem,
	.sysctl_rmem		= sysctl_tcp_rmem,
	.max_header		= MAX_TCP_HEADER,
	.obj_size		= sizeof(struct tcp6_sock),
2084
	.twsk_prot		= &tcp6_timewait_sock_ops,
2085
	.rsk_prot		= &tcp6_request_sock_ops,
2086
	.h.hashinfo		= &tcp_hashinfo,
2087 2088 2089 2090
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
L
Linus Torvalds 已提交
2091 2092 2093 2094 2095
};

static struct inet6_protocol tcpv6_protocol = {
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2096
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2097
	.gso_segment	=	tcp_tso_segment,
L
Linus Torvalds 已提交
2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
	.flags		=	INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};

static struct inet_protosw tcpv6_protosw = {
	.type		=	SOCK_STREAM,
	.protocol	=	IPPROTO_TCP,
	.prot		=	&tcpv6_prot,
	.ops		=	&inet6_stream_ops,
	.capability	=	-1,
	.no_check	=	0,
2108 2109
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2110 2111
};

2112 2113
static int tcpv6_net_init(struct net *net)
{
2114 2115
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2116 2117 2118 2119
}

static void tcpv6_net_exit(struct net *net)
{
2120
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
2121 2122 2123 2124 2125 2126 2127
}

static struct pernet_operations tcpv6_net_ops = {
	.init = tcpv6_net_init,
	.exit = tcpv6_net_exit,
};

2128
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2129
{
2130 2131 2132 2133 2134 2135
	int ret;

	ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
	if (ret)
		goto out;

L
Linus Torvalds 已提交
2136
	/* register inet6 protocol */
2137 2138 2139 2140
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2141
	ret = register_pernet_subsys(&tcpv6_net_ops);
2142 2143 2144 2145
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2146

2147 2148 2149 2150 2151 2152 2153
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2154
void tcpv6_exit(void)
2155
{
2156
	unregister_pernet_subsys(&tcpv6_net_ops);
2157 2158
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2159
}