tcp_ipv6.c 54.3 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
 *	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.
 */

H
Herbert Xu 已提交
26
#include <linux/bottom_half.h>
L
Linus Torvalds 已提交
27 28 29 30 31 32 33 34 35 36 37 38 39 40
#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>
41
#include <linux/slab.h>
L
Linus Torvalds 已提交
42 43 44 45 46 47 48

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

#include <net/tcp.h>
#include <net/ndisc.h>
49
#include <net/inet6_hashtables.h>
50
#include <net/inet6_connection_sock.h>
L
Linus Torvalds 已提交
51 52 53 54 55 56 57 58 59 60
#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>
61
#include <net/timewait_sock.h>
62
#include <net/netdma.h>
63
#include <net/inet_common.h>
64
#include <net/secure_seq.h>
G
Glauber Costa 已提交
65
#include <net/tcp_memcontrol.h>
L
Linus Torvalds 已提交
66 67 68 69 70 71

#include <asm/uaccess.h>

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

72 73 74 75
#include <linux/crypto.h>
#include <linux/scatterlist.h>

static void	tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
76 77
static void	tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				      struct request_sock *req);
L
Linus Torvalds 已提交
78 79

static int	tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
80
static void	__tcp_v6_send_check(struct sk_buff *skb,
81 82
				    const struct in6_addr *saddr,
				    const struct in6_addr *daddr);
L
Linus Torvalds 已提交
83

84 85
static const struct inet_connection_sock_af_ops ipv6_mapped;
static const struct inet_connection_sock_af_ops ipv6_specific;
86
#ifdef CONFIG_TCP_MD5SIG
87 88
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
89 90
#else
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
91
						   const struct in6_addr *addr)
92 93 94
{
	return NULL;
}
95
#endif
L
Linus Torvalds 已提交
96 97 98 99

static void tcp_v6_hash(struct sock *sk)
{
	if (sk->sk_state != TCP_CLOSE) {
100
		if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
L
Linus Torvalds 已提交
101 102 103 104
			tcp_prot.hash(sk);
			return;
		}
		local_bh_disable();
105
		__inet6_hash(sk, NULL);
L
Linus Torvalds 已提交
106 107 108 109
		local_bh_enable();
	}
}

H
Herbert Xu 已提交
110
static __inline__ __sum16 tcp_v6_check(int len,
111 112
				   const struct in6_addr *saddr,
				   const struct in6_addr *daddr,
113
				   __wsum base)
L
Linus Torvalds 已提交
114 115 116 117
{
	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
}

118
static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
L
Linus Torvalds 已提交
119
{
120 121
	return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
					    ipv6_hdr(skb)->saddr.s6_addr32,
122 123
					    tcp_hdr(skb)->dest,
					    tcp_hdr(skb)->source);
L
Linus Torvalds 已提交
124 125
}

126
static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
L
Linus Torvalds 已提交
127 128 129
			  int addr_len)
{
	struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
130
	struct inet_sock *inet = inet_sk(sk);
131
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
132 133
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
134
	struct in6_addr *saddr = NULL, *final_p, final;
135
	struct rt6_info *rt;
136
	struct flowi6 fl6;
L
Linus Torvalds 已提交
137 138 139 140
	struct dst_entry *dst;
	int addr_type;
	int err;

141
	if (addr_len < SIN6_LEN_RFC2133)
L
Linus Torvalds 已提交
142 143
		return -EINVAL;

144
	if (usin->sin6_family != AF_INET6)
E
Eric Dumazet 已提交
145
		return -EAFNOSUPPORT;
L
Linus Torvalds 已提交
146

147
	memset(&fl6, 0, sizeof(fl6));
L
Linus Torvalds 已提交
148 149

	if (np->sndflow) {
150 151 152
		fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
		IP6_ECN_flow_init(fl6.flowlabel);
		if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
L
Linus Torvalds 已提交
153
			struct ip6_flowlabel *flowlabel;
154
			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
L
Linus Torvalds 已提交
155 156
			if (flowlabel == NULL)
				return -EINVAL;
A
Alexey Dobriyan 已提交
157
			usin->sin6_addr = flowlabel->dst;
L
Linus Torvalds 已提交
158 159 160 161 162
			fl6_sock_release(flowlabel);
		}
	}

	/*
163 164 165 166 167
	 *	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
168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198

	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;
	}

A
Alexey Dobriyan 已提交
199
	np->daddr = usin->sin6_addr;
200
	np->flow_label = fl6.flowlabel;
L
Linus Torvalds 已提交
201 202 203 204 205 206

	/*
	 *	TCP over IPv4
	 */

	if (addr_type == IPV6_ADDR_MAPPED) {
207
		u32 exthdrlen = icsk->icsk_ext_hdr_len;
L
Linus Torvalds 已提交
208 209 210 211 212 213 214 215 216 217 218
		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];

219
		icsk->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
220
		sk->sk_backlog_rcv = tcp_v4_do_rcv;
221 222 223
#ifdef CONFIG_TCP_MD5SIG
		tp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif
L
Linus Torvalds 已提交
224 225 226 227

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

		if (err) {
228 229
			icsk->icsk_ext_hdr_len = exthdrlen;
			icsk->icsk_af_ops = &ipv6_specific;
L
Linus Torvalds 已提交
230
			sk->sk_backlog_rcv = tcp_v6_do_rcv;
231 232 233
#ifdef CONFIG_TCP_MD5SIG
			tp->af_specific = &tcp_sock_ipv6_specific;
#endif
L
Linus Torvalds 已提交
234 235
			goto failure;
		} else {
E
Eric Dumazet 已提交
236 237 238
			ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
			ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
					       &np->rcv_saddr);
L
Linus Torvalds 已提交
239 240 241 242 243 244 245 246
		}

		return err;
	}

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

247
	fl6.flowi6_proto = IPPROTO_TCP;
A
Alexey Dobriyan 已提交
248 249
	fl6.daddr = np->daddr;
	fl6.saddr = saddr ? *saddr : np->saddr;
250 251
	fl6.flowi6_oif = sk->sk_bound_dev_if;
	fl6.flowi6_mark = sk->sk_mark;
252 253
	fl6.fl6_dport = usin->sin6_port;
	fl6.fl6_sport = inet->inet_sport;
L
Linus Torvalds 已提交
254

255
	final_p = fl6_update_dst(&fl6, np->opt, &final);
L
Linus Torvalds 已提交
256

257
	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
V
Venkat Yekkirala 已提交
258

259
	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
260 261
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
L
Linus Torvalds 已提交
262
		goto failure;
263
	}
L
Linus Torvalds 已提交
264 265

	if (saddr == NULL) {
266
		saddr = &fl6.saddr;
A
Alexey Dobriyan 已提交
267
		np->rcv_saddr = *saddr;
L
Linus Torvalds 已提交
268 269 270
	}

	/* set the source address */
A
Alexey Dobriyan 已提交
271
	np->saddr = *saddr;
E
Eric Dumazet 已提交
272
	inet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
273

H
Herbert Xu 已提交
274
	sk->sk_gso_type = SKB_GSO_TCPV6;
275
	__ip6_dst_store(sk, dst, NULL, NULL);
L
Linus Torvalds 已提交
276

277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296
	rt = (struct rt6_info *) dst;
	if (tcp_death_row.sysctl_tw_recycle &&
	    !tp->rx_opt.ts_recent_stamp &&
	    ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) {
		struct inet_peer *peer = rt6_get_peer(rt);
		/*
		 * VJ's idea. We save last timestamp seen from
		 * the destination in peer table, when entering state
		 * TIME-WAIT * and initialize rx_opt.ts_recent from it,
		 * when trying new connection.
		 */
		if (peer) {
			inet_peer_refcheck(peer);
			if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
				tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
				tp->rx_opt.ts_recent = peer->tcp_ts;
			}
		}
	}

297
	icsk->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
298
	if (np->opt)
299 300
		icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
					  np->opt->opt_nflen);
L
Linus Torvalds 已提交
301 302 303

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

E
Eric Dumazet 已提交
304
	inet->inet_dport = usin->sin6_port;
L
Linus Torvalds 已提交
305 306

	tcp_set_state(sk, TCP_SYN_SENT);
307
	err = inet6_hash_connect(&tcp_death_row, sk);
L
Linus Torvalds 已提交
308 309 310 311 312 313
	if (err)
		goto late_failure;

	if (!tp->write_seq)
		tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
							     np->daddr.s6_addr32,
E
Eric Dumazet 已提交
314 315
							     inet->inet_sport,
							     inet->inet_dport);
L
Linus Torvalds 已提交
316 317 318 319 320 321 322 323 324 325 326

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

	return 0;

late_failure:
	tcp_set_state(sk, TCP_CLOSE);
	__sk_dst_reset(sk);
failure:
E
Eric Dumazet 已提交
327
	inet->inet_dport = 0;
L
Linus Torvalds 已提交
328 329 330 331 332
	sk->sk_route_caps = 0;
	return err;
}

static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
333
		u8 type, u8 code, int offset, __be32 info)
L
Linus Torvalds 已提交
334
{
335
	const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
336
	const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
L
Linus Torvalds 已提交
337 338 339
	struct ipv6_pinfo *np;
	struct sock *sk;
	int err;
340
	struct tcp_sock *tp;
L
Linus Torvalds 已提交
341
	__u32 seq;
342
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
343

344
	sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
345
			th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
L
Linus Torvalds 已提交
346 347

	if (sk == NULL) {
348 349
		ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
				   ICMP6_MIB_INERRORS);
L
Linus Torvalds 已提交
350 351 352 353
		return;
	}

	if (sk->sk_state == TCP_TIME_WAIT) {
354
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
355 356 357 358 359
		return;
	}

	bh_lock_sock(sk);
	if (sock_owned_by_user(sk))
360
		NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
L
Linus Torvalds 已提交
361 362 363 364

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

365 366 367 368 369
	if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto out;
	}

L
Linus Torvalds 已提交
370
	tp = tcp_sk(sk);
371
	seq = ntohl(th->seq);
L
Linus Torvalds 已提交
372 373
	if (sk->sk_state != TCP_LISTEN &&
	    !between(seq, tp->snd_una, tp->snd_nxt)) {
374
		NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
L
Linus Torvalds 已提交
375 376 377 378 379 380
		goto out;
	}

	np = inet6_sk(sk);

	if (type == ICMPV6_PKT_TOOBIG) {
381
		struct dst_entry *dst;
L
Linus Torvalds 已提交
382 383 384 385 386 387 388 389 390 391 392

		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);
393
			struct flowi6 fl6;
L
Linus Torvalds 已提交
394 395 396 397 398

			/* BUGGG_FUTURE: Again, it is not clear how
			   to handle rthdr case. Ignore this complexity
			   for now.
			 */
399 400
			memset(&fl6, 0, sizeof(fl6));
			fl6.flowi6_proto = IPPROTO_TCP;
A
Alexey Dobriyan 已提交
401 402
			fl6.daddr = np->daddr;
			fl6.saddr = np->saddr;
403 404
			fl6.flowi6_oif = sk->sk_bound_dev_if;
			fl6.flowi6_mark = sk->sk_mark;
405 406
			fl6.fl6_dport = inet->inet_dport;
			fl6.fl6_sport = inet->inet_sport;
407 408 409
			security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));

			dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
410 411
			if (IS_ERR(dst)) {
				sk->sk_err_soft = -PTR_ERR(dst);
L
Linus Torvalds 已提交
412 413 414 415 416 417
				goto out;
			}

		} else
			dst_hold(dst);

418
		if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
L
Linus Torvalds 已提交
419 420 421 422 423 424 425 426 427
			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);

428
	/* Might be for an request_sock */
L
Linus Torvalds 已提交
429
	switch (sk->sk_state) {
430
		struct request_sock *req, **prev;
L
Linus Torvalds 已提交
431 432 433 434
	case TCP_LISTEN:
		if (sock_owned_by_user(sk))
			goto out;

435 436
		req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
					   &hdr->saddr, inet6_iif(skb));
L
Linus Torvalds 已提交
437 438 439 440 441 442
		if (!req)
			goto out;

		/* ICMPs are not backlogged, hence we cannot get
		 * an established socket here.
		 */
443
		WARN_ON(req->sk != NULL);
L
Linus Torvalds 已提交
444

445
		if (seq != tcp_rsk(req)->snt_isn) {
446
			NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
L
Linus Torvalds 已提交
447 448 449
			goto out;
		}

450
		inet_csk_reqsk_queue_drop(sk, req, prev);
L
Linus Torvalds 已提交
451 452 453 454
		goto out;

	case TCP_SYN_SENT:
	case TCP_SYN_RECV:  /* Cannot happen.
455
			       It can, it SYNs are crossed. --ANK */
L
Linus Torvalds 已提交
456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477
		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);
}


478 479
static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
			      struct request_values *rvp)
L
Linus Torvalds 已提交
480
{
481
	struct inet6_request_sock *treq = inet6_rsk(req);
L
Linus Torvalds 已提交
482 483 484
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
	struct ipv6_txoptions *opt = NULL;
485
	struct in6_addr * final_p, final;
486
	struct flowi6 fl6;
487
	struct dst_entry *dst;
488
	int err;
L
Linus Torvalds 已提交
489

490 491
	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_proto = IPPROTO_TCP;
A
Alexey Dobriyan 已提交
492 493
	fl6.daddr = treq->rmt_addr;
	fl6.saddr = treq->loc_addr;
494 495 496
	fl6.flowlabel = 0;
	fl6.flowi6_oif = treq->iif;
	fl6.flowi6_mark = sk->sk_mark;
497 498
	fl6.fl6_dport = inet_rsk(req)->rmt_port;
	fl6.fl6_sport = inet_rsk(req)->loc_port;
499
	security_req_classify_flow(req, flowi6_to_flowi(&fl6));
L
Linus Torvalds 已提交
500

501
	opt = np->opt;
502
	final_p = fl6_update_dst(&fl6, opt, &final);
L
Linus Torvalds 已提交
503

504
	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
505 506
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
507
		dst = NULL;
508
		goto done;
509
	}
510
	skb = tcp_make_synack(sk, dst, req, rvp);
511
	err = -ENOMEM;
L
Linus Torvalds 已提交
512
	if (skb) {
513
		__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
L
Linus Torvalds 已提交
514

A
Alexey Dobriyan 已提交
515
		fl6.daddr = treq->rmt_addr;
516
		err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
517
		err = net_xmit_eval(err);
L
Linus Torvalds 已提交
518 519 520
	}

done:
521
	if (opt && opt != np->opt)
L
Linus Torvalds 已提交
522
		sock_kfree_s(sk, opt, opt->tot_len);
523
	dst_release(dst);
L
Linus Torvalds 已提交
524 525 526
	return err;
}

527 528 529 530 531 532 533
static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
			     struct request_values *rvp)
{
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
	return tcp_v6_send_synack(sk, req, rvp);
}

534
static void tcp_v6_reqsk_destructor(struct request_sock *req)
L
Linus Torvalds 已提交
535
{
536
	kfree_skb(inet6_rsk(req)->pktopts);
L
Linus Torvalds 已提交
537 538
}

539 540
#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
541
						   const struct in6_addr *addr)
542
{
E
Eric Dumazet 已提交
543
	return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
}

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_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;

	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) {
B
Brian Haley 已提交
574
		if (ipv6_addr_v4mapped(&sin6->sin6_addr))
E
Eric Dumazet 已提交
575 576 577 578
			return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
					      AF_INET);
		return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
				      AF_INET6);
579 580 581 582 583
	}

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

E
Eric Dumazet 已提交
584 585 586
	if (ipv6_addr_v4mapped(&sin6->sin6_addr))
		return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
				      AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
587

E
Eric Dumazet 已提交
588 589
	return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
			      AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
590 591
}

592
static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
593 594
					const struct in6_addr *daddr,
					const struct in6_addr *saddr, int nbytes)
595 596
{
	struct tcp6_pseudohdr *bp;
597
	struct scatterlist sg;
598

599 600
	bp = &hp->md5_blk.ip6;
	/* 1. TCP pseudo-header (RFC2460) */
A
Alexey Dobriyan 已提交
601 602
	bp->saddr = *saddr;
	bp->daddr = *daddr;
603
	bp->protocol = cpu_to_be32(IPPROTO_TCP);
A
Adam Langley 已提交
604
	bp->len = cpu_to_be32(nbytes);
605

606 607 608
	sg_init_one(&sg, bp, sizeof(*bp));
	return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
}
609

610
static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
611
			       const struct in6_addr *daddr, struct in6_addr *saddr,
E
Eric Dumazet 已提交
612
			       const struct tcphdr *th)
613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
{
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;
	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
631 632 633 634
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;
635

636 637 638 639
clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
640
	return 1;
641 642
}

643
static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
E
Eric Dumazet 已提交
644 645 646
			       const struct sock *sk,
			       const struct request_sock *req,
			       const struct sk_buff *skb)
647
{
648
	const struct in6_addr *saddr, *daddr;
649 650
	struct tcp_md5sig_pool *hp;
	struct hash_desc *desc;
E
Eric Dumazet 已提交
651
	const struct tcphdr *th = tcp_hdr(skb);
652 653 654 655

	if (sk) {
		saddr = &inet6_sk(sk)->saddr;
		daddr = &inet6_sk(sk)->daddr;
656
	} else if (req) {
657 658
		saddr = &inet6_rsk(req)->loc_addr;
		daddr = &inet6_rsk(req)->rmt_addr;
659
	} else {
660
		const struct ipv6hdr *ip6h = ipv6_hdr(skb);
661 662
		saddr = &ip6h->saddr;
		daddr = &ip6h->daddr;
663
	}
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691

	hp = tcp_get_md5sig_pool();
	if (!hp)
		goto clear_hash_noput;
	desc = &hp->md5_desc;

	if (crypto_hash_init(desc))
		goto clear_hash;

	if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
		goto clear_hash;
	if (tcp_md5_hash_header(hp, th))
		goto clear_hash;
	if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
		goto clear_hash;
	if (tcp_md5_hash_key(hp, key))
		goto clear_hash;
	if (crypto_hash_final(desc, md5_hash))
		goto clear_hash;

	tcp_put_md5sig_pool();
	return 0;

clear_hash:
	tcp_put_md5sig_pool();
clear_hash_noput:
	memset(md5_hash, 0, 16);
	return 1;
692 693
}

E
Eric Dumazet 已提交
694
static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
695
{
696
	const __u8 *hash_location = NULL;
697
	struct tcp_md5sig_key *hash_expected;
698
	const struct ipv6hdr *ip6h = ipv6_hdr(skb);
E
Eric Dumazet 已提交
699
	const struct tcphdr *th = tcp_hdr(skb);
700 701 702 703
	int genhash;
	u8 newhash[16];

	hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
704
	hash_location = tcp_parse_md5sig_option(th);
705

706 707 708 709 710 711
	/* We've parsed the options - do we have a hash? */
	if (!hash_expected && !hash_location)
		return 0;

	if (hash_expected && !hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
712 713 714
		return 1;
	}

715 716
	if (!hash_expected && hash_location) {
		NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
717 718 719 720
		return 1;
	}

	/* check the signature */
721 722 723 724
	genhash = tcp_v6_md5_hash_skb(newhash,
				      hash_expected,
				      NULL, NULL, skb);

725
	if (genhash || memcmp(hash_location, newhash, 16) != 0) {
726 727 728 729
		net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
				     genhash ? "failed" : "mismatch",
				     &ip6h->saddr, ntohs(th->source),
				     &ip6h->daddr, ntohs(th->dest));
730 731 732 733 734 735
		return 1;
	}
	return 0;
}
#endif

736
struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
L
Linus Torvalds 已提交
737
	.family		=	AF_INET6,
738
	.obj_size	=	sizeof(struct tcp6_request_sock),
739
	.rtx_syn_ack	=	tcp_v6_rtx_synack,
740 741
	.send_ack	=	tcp_v6_reqsk_send_ack,
	.destructor	=	tcp_v6_reqsk_destructor,
742 743
	.send_reset	=	tcp_v6_send_reset,
	.syn_ack_timeout = 	tcp_syn_ack_timeout,
L
Linus Torvalds 已提交
744 745
};

746
#ifdef CONFIG_TCP_MD5SIG
747
static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
748
	.md5_lookup	=	tcp_v6_reqsk_md5_lookup,
749
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
750
};
751
#endif
752

753
static void __tcp_v6_send_check(struct sk_buff *skb,
754
				const struct in6_addr *saddr, const struct in6_addr *daddr)
L
Linus Torvalds 已提交
755
{
756
	struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
757

758
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
759
		th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
760
		skb->csum_start = skb_transport_header(skb) - skb->head;
A
Al Viro 已提交
761
		skb->csum_offset = offsetof(struct tcphdr, check);
L
Linus Torvalds 已提交
762
	} else {
763 764 765
		th->check = tcp_v6_check(skb->len, saddr, daddr,
					 csum_partial(th, th->doff << 2,
						      skb->csum));
L
Linus Torvalds 已提交
766 767 768
	}
}

769
static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
770 771 772 773 774 775
{
	struct ipv6_pinfo *np = inet6_sk(sk);

	__tcp_v6_send_check(skb, &np->saddr, &np->daddr);
}

776 777
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
778
	const struct ipv6hdr *ipv6h;
779 780 781 782 783
	struct tcphdr *th;

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

784
	ipv6h = ipv6_hdr(skb);
785
	th = tcp_hdr(skb);
786 787

	th->check = 0;
788
	skb->ip_summed = CHECKSUM_PARTIAL;
789
	__tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
790 791
	return 0;
}
L
Linus Torvalds 已提交
792

H
Herbert Xu 已提交
793 794
static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
					 struct sk_buff *skb)
H
Herbert Xu 已提交
795
{
796
	const struct ipv6hdr *iph = skb_gro_network_header(skb);
H
Herbert Xu 已提交
797 798 799

	switch (skb->ip_summed) {
	case CHECKSUM_COMPLETE:
800
		if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
H
Herbert Xu 已提交
801 802 803 804 805 806 807 808 809 810 811 812 813 814
				  skb->csum)) {
			skb->ip_summed = CHECKSUM_UNNECESSARY;
			break;
		}

		/* fall through */
	case CHECKSUM_NONE:
		NAPI_GRO_CB(skb)->flush = 1;
		return NULL;
	}

	return tcp_gro_receive(head, skb);
}

H
Herbert Xu 已提交
815
static int tcp6_gro_complete(struct sk_buff *skb)
H
Herbert Xu 已提交
816
{
817
	const struct ipv6hdr *iph = ipv6_hdr(skb);
H
Herbert Xu 已提交
818 819 820 821 822 823 824 825 826
	struct tcphdr *th = tcp_hdr(skb);

	th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
				  &iph->saddr, &iph->daddr, 0);
	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;

	return tcp_gro_complete(skb);
}

827
static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
828
				 u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass)
L
Linus Torvalds 已提交
829
{
830 831
	const struct tcphdr *th = tcp_hdr(skb);
	struct tcphdr *t1;
L
Linus Torvalds 已提交
832
	struct sk_buff *buff;
833
	struct flowi6 fl6;
E
Eric Dumazet 已提交
834
	struct net *net = dev_net(skb_dst(skb)->dev);
835
	struct sock *ctl_sk = net->ipv6.tcp_sk;
836
	unsigned int tot_len = sizeof(struct tcphdr);
E
Eric Dumazet 已提交
837
	struct dst_entry *dst;
838
	__be32 *topt;
L
Linus Torvalds 已提交
839

840 841
	if (ts)
		tot_len += TCPOLEN_TSTAMP_ALIGNED;
842 843 844 845 846 847
#ifdef CONFIG_TCP_MD5SIG
	if (key)
		tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif

	buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
L
Linus Torvalds 已提交
848
			 GFP_ATOMIC);
849 850
	if (buff == NULL)
		return;
L
Linus Torvalds 已提交
851

852
	skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
L
Linus Torvalds 已提交
853

854
	t1 = (struct tcphdr *) skb_push(buff, tot_len);
855
	skb_reset_transport_header(buff);
L
Linus Torvalds 已提交
856 857 858 859 860

	/* Swap the send and the receive. */
	memset(t1, 0, sizeof(*t1));
	t1->dest = th->source;
	t1->source = th->dest;
861
	t1->doff = tot_len / 4;
862 863 864 865 866
	t1->seq = htonl(seq);
	t1->ack_seq = htonl(ack);
	t1->ack = !rst || !th->ack;
	t1->rst = rst;
	t1->window = htons(win);
L
Linus Torvalds 已提交
867

868 869
	topt = (__be32 *)(t1 + 1);

870 871 872 873 874 875 876
	if (ts) {
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
		*topt++ = htonl(tcp_time_stamp);
		*topt++ = htonl(ts);
	}

877 878
#ifdef CONFIG_TCP_MD5SIG
	if (key) {
879 880 881
		*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
				(TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
		tcp_v6_md5_hash_hdr((__u8 *)topt, key,
882 883
				    &ipv6_hdr(skb)->saddr,
				    &ipv6_hdr(skb)->daddr, t1);
884 885 886
	}
#endif

887
	memset(&fl6, 0, sizeof(fl6));
A
Alexey Dobriyan 已提交
888 889
	fl6.daddr = ipv6_hdr(skb)->saddr;
	fl6.saddr = ipv6_hdr(skb)->daddr;
L
Linus Torvalds 已提交
890

891 892 893
	buff->ip_summed = CHECKSUM_PARTIAL;
	buff->csum = 0;

894
	__tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
L
Linus Torvalds 已提交
895

896 897
	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.flowi6_oif = inet6_iif(skb);
898 899
	fl6.fl6_dport = t1->dest;
	fl6.fl6_sport = t1->source;
900
	security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
L
Linus Torvalds 已提交
901

902 903 904 905
	/* Pass a socket to ip6_dst_lookup either it is for RST
	 * Underlying function will use this to retrieve the network
	 * namespace
	 */
906
	dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
907 908
	if (!IS_ERR(dst)) {
		skb_dst_set(buff, dst);
909
		ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
910 911 912 913
		TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
		if (rst)
			TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
		return;
L
Linus Torvalds 已提交
914 915 916 917 918
	}

	kfree_skb(buff);
}

919
static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
L
Linus Torvalds 已提交
920
{
921
	const struct tcphdr *th = tcp_hdr(skb);
922
	u32 seq = 0, ack_seq = 0;
923
	struct tcp_md5sig_key *key = NULL;
924 925 926 927 928 929 930
#ifdef CONFIG_TCP_MD5SIG
	const __u8 *hash_location = NULL;
	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
	unsigned char newhash[16];
	int genhash;
	struct sock *sk1 = NULL;
#endif
L
Linus Torvalds 已提交
931

932
	if (th->rst)
L
Linus Torvalds 已提交
933 934
		return;

935 936
	if (!ipv6_unicast_destination(skb))
		return;
L
Linus Torvalds 已提交
937

938
#ifdef CONFIG_TCP_MD5SIG
939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
	hash_location = tcp_parse_md5sig_option(th);
	if (!sk && hash_location) {
		/*
		 * active side is lost. Try to find listening socket through
		 * source port, and then find md5 key through listening socket.
		 * we are not loose security here:
		 * Incoming packet is checked with md5 hash with finding key,
		 * no RST generated if md5 hash doesn't match.
		 */
		sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
					   &tcp_hashinfo, &ipv6h->daddr,
					   ntohs(th->source), inet6_iif(skb));
		if (!sk1)
			return;

		rcu_read_lock();
		key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
		if (!key)
			goto release_sk1;

		genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb);
		if (genhash || memcmp(hash_location, newhash, 16) != 0)
			goto release_sk1;
	} else {
		key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
	}
965 966
#endif

967 968 969 970 971
	if (th->ack)
		seq = ntohl(th->ack_seq);
	else
		ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
			  (th->doff << 2);
L
Linus Torvalds 已提交
972

973
	tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0);
974 975 976 977 978 979 980 981

#ifdef CONFIG_TCP_MD5SIG
release_sk1:
	if (sk1) {
		rcu_read_unlock();
		sock_put(sk1);
	}
#endif
982
}
L
Linus Torvalds 已提交
983

984
static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
985
			    struct tcp_md5sig_key *key, u8 tclass)
986
{
987
	tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass);
L
Linus Torvalds 已提交
988 989 990 991
}

static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
992
	struct inet_timewait_sock *tw = inet_twsk(sk);
993
	struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
L
Linus Torvalds 已提交
994

995
	tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
996
			tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
997 998
			tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
			tw->tw_tclass);
L
Linus Torvalds 已提交
999

1000
	inet_twsk_put(tw);
L
Linus Torvalds 已提交
1001 1002
}

1003 1004
static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
				  struct request_sock *req)
L
Linus Torvalds 已提交
1005
{
1006
	tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1007
			tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
L
Linus Torvalds 已提交
1008 1009 1010 1011 1012
}


static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
1013
	struct request_sock *req, **prev;
1014
	const struct tcphdr *th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1015 1016 1017
	struct sock *nsk;

	/* Find possible connection requests. */
1018
	req = inet6_csk_search_req(sk, &prev, th->source,
1019 1020
				   &ipv6_hdr(skb)->saddr,
				   &ipv6_hdr(skb)->daddr, inet6_iif(skb));
L
Linus Torvalds 已提交
1021 1022 1023
	if (req)
		return tcp_check_req(sk, skb, req, prev);

1024
	nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1025 1026
			&ipv6_hdr(skb)->saddr, th->source,
			&ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1027 1028 1029 1030 1031 1032

	if (nsk) {
		if (nsk->sk_state != TCP_TIME_WAIT) {
			bh_lock_sock(nsk);
			return nsk;
		}
1033
		inet_twsk_put(inet_twsk(nsk));
L
Linus Torvalds 已提交
1034 1035 1036
		return NULL;
	}

1037
#ifdef CONFIG_SYN_COOKIES
1038
	if (!th->syn)
1039
		sk = cookie_v6_check(sk, skb);
L
Linus Torvalds 已提交
1040 1041 1042 1043 1044 1045 1046 1047 1048
#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)
{
1049
	struct tcp_extend_values tmp_ext;
1050
	struct tcp_options_received tmp_opt;
1051
	const u8 *hash_location;
1052
	struct request_sock *req;
1053
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1054 1055
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct tcp_sock *tp = tcp_sk(sk);
1056
	__u32 isn = TCP_SKB_CB(skb)->when;
1057
	struct dst_entry *dst = NULL;
1058
	int want_cookie = 0;
L
Linus Torvalds 已提交
1059 1060 1061 1062 1063

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

	if (!ipv6_unicast_destination(skb))
1064
		goto drop;
L
Linus Torvalds 已提交
1065

1066
	if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1067 1068 1069
		want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
		if (!want_cookie)
			goto drop;
L
Linus Torvalds 已提交
1070 1071
	}

1072
	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
L
Linus Torvalds 已提交
1073 1074
		goto drop;

1075
	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
L
Linus Torvalds 已提交
1076 1077 1078
	if (req == NULL)
		goto drop;

1079 1080 1081 1082
#ifdef CONFIG_TCP_MD5SIG
	tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
#endif

L
Linus Torvalds 已提交
1083 1084 1085
	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;
1086
	tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102

	if (tmp_opt.cookie_plus > 0 &&
	    tmp_opt.saw_tstamp &&
	    !tp->rx_opt.cookie_out_never &&
	    (sysctl_tcp_cookie_size > 0 ||
	     (tp->cookie_values != NULL &&
	      tp->cookie_values->cookie_desired > 0))) {
		u8 *c;
		u32 *d;
		u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
		int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;

		if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
			goto drop_and_free;

		/* Secret recipe starts with IP addresses */
1103
		d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
1104 1105 1106 1107
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
1108
		d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
1109 1110 1111 1112 1113 1114 1115 1116 1117
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;
		*mess++ ^= *d++;

		/* plus variable length Initiator Cookie */
		c = (u8 *)mess;
		while (l-- > 0)
			*c++ ^= *hash_location++;
L
Linus Torvalds 已提交
1118

1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
		want_cookie = 0;	/* not our kind of cookie */
		tmp_ext.cookie_out_never = 0; /* false */
		tmp_ext.cookie_plus = tmp_opt.cookie_plus;
	} else if (!tp->rx_opt.cookie_in_always) {
		/* redundant indications, but ensure initialization. */
		tmp_ext.cookie_out_never = 1; /* true */
		tmp_ext.cookie_plus = 0;
	} else {
		goto drop_and_free;
	}
	tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
L
Linus Torvalds 已提交
1130

1131
	if (want_cookie && !tmp_opt.saw_tstamp)
1132 1133
		tcp_clear_options(&tmp_opt);

L
Linus Torvalds 已提交
1134 1135 1136
	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
	tcp_openreq_init(req, &tmp_opt, skb);

1137
	treq = inet6_rsk(req);
A
Alexey Dobriyan 已提交
1138 1139
	treq->rmt_addr = ipv6_hdr(skb)->saddr;
	treq->loc_addr = ipv6_hdr(skb)->daddr;
1140
	if (!want_cookie || tmp_opt.tstamp_ok)
1141
		TCP_ECN_create_request(req, skb);
1142

1143 1144 1145 1146 1147 1148 1149
	treq->iif = sk->sk_bound_dev_if;

	/* 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);

1150
	if (!isn) {
1151 1152
		struct inet_peer *peer = NULL;

1153 1154 1155 1156 1157 1158
		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;
		}
1159 1160

		if (want_cookie) {
1161 1162
			isn = cookie_v6_init_sequence(sk, skb, &req->mss);
			req->cookie_ts = tmp_opt.tstamp_ok;
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
			goto have_isn;
		}

		/* VJ's idea. We save last timestamp seen
		 * from the destination in peer table, when entering
		 * state TIME-WAIT, and check against it before
		 * accepting new connection request.
		 *
		 * If "isn" is not zero, this request hit alive
		 * timewait bucket, so that all the necessary checks
		 * are made in the function processing timewait state.
		 */
		if (tmp_opt.saw_tstamp &&
		    tcp_death_row.sysctl_tw_recycle &&
		    (dst = inet6_csk_route_req(sk, req)) != NULL &&
		    (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
1179
		    ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
				    &treq->rmt_addr)) {
			inet_peer_refcheck(peer);
			if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
			    (s32)(peer->tcp_ts - req->ts_recent) >
							TCP_PAWS_WINDOW) {
				NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
				goto drop_and_release;
			}
		}
		/* Kill the following clause, if you dislike this way. */
		else if (!sysctl_tcp_syncookies &&
			 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
			  (sysctl_max_syn_backlog >> 2)) &&
			 (!peer || !peer->tcp_ts_stamp) &&
			 (!dst || !dst_metric(dst, RTAX_RTT))) {
			/* Without syncookies last quarter of
			 * backlog is filled with destinations,
			 * proven to be alive.
			 * It means that we continue to communicate
			 * to destinations, already remembered
			 * to the moment of synflood.
			 */
			LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
				       &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
			goto drop_and_release;
1205
		}
1206 1207

		isn = tcp_v6_init_sequence(skb);
1208
	}
1209
have_isn:
1210
	tcp_rsk(req)->snt_isn = isn;
1211
	tcp_rsk(req)->snt_synack = tcp_time_stamp;
L
Linus Torvalds 已提交
1212

1213 1214
	security_inet_conn_request(sk, skb, req);

1215 1216 1217
	if (tcp_v6_send_synack(sk, req,
			       (struct request_values *)&tmp_ext) ||
	    want_cookie)
1218
		goto drop_and_free;
L
Linus Torvalds 已提交
1219

1220 1221
	inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
	return 0;
L
Linus Torvalds 已提交
1222

1223 1224
drop_and_release:
	dst_release(dst);
1225 1226
drop_and_free:
	reqsk_free(req);
L
Linus Torvalds 已提交
1227 1228 1229 1230 1231
drop:
	return 0; /* don't send reset */
}

static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1232
					  struct request_sock *req,
L
Linus Torvalds 已提交
1233 1234
					  struct dst_entry *dst)
{
1235
	struct inet6_request_sock *treq;
L
Linus Torvalds 已提交
1236 1237 1238 1239 1240 1241
	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;
1242 1243 1244
#ifdef CONFIG_TCP_MD5SIG
	struct tcp_md5sig_key *key;
#endif
L
Linus Torvalds 已提交
1245 1246 1247 1248 1249 1250 1251 1252

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

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

1253
		if (newsk == NULL)
L
Linus Torvalds 已提交
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264
			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));

E
Eric Dumazet 已提交
1265
		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
L
Linus Torvalds 已提交
1266

E
Eric Dumazet 已提交
1267
		ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
L
Linus Torvalds 已提交
1268

A
Alexey Dobriyan 已提交
1269
		newnp->rcv_saddr = newnp->saddr;
L
Linus Torvalds 已提交
1270

1271
		inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
L
Linus Torvalds 已提交
1272
		newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1273 1274 1275 1276
#ifdef CONFIG_TCP_MD5SIG
		newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
#endif

1277 1278
		newnp->ipv6_ac_list = NULL;
		newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1279 1280
		newnp->pktoptions  = NULL;
		newnp->opt	   = NULL;
1281
		newnp->mcast_oif   = inet6_iif(skb);
1282
		newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
1283
		newnp->rcv_tclass  = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1284

1285 1286 1287 1288
		/*
		 * 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
1289 1290 1291
		 */

		/* It is tricky place. Until this moment IPv4 tcp
1292
		   worked with IPv6 icsk.icsk_af_ops.
L
Linus Torvalds 已提交
1293 1294
		   Sync it now.
		 */
1295
		tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
L
Linus Torvalds 已提交
1296 1297 1298 1299

		return newsk;
	}

1300
	treq = inet6_rsk(req);
L
Linus Torvalds 已提交
1301 1302 1303 1304 1305
	opt = np->opt;

	if (sk_acceptq_is_full(sk))
		goto out_overflow;

1306 1307 1308
	if (!dst) {
		dst = inet6_csk_route_req(sk, req);
		if (!dst)
L
Linus Torvalds 已提交
1309
			goto out;
1310
	}
L
Linus Torvalds 已提交
1311 1312 1313

	newsk = tcp_create_openreq_child(sk, req, skb);
	if (newsk == NULL)
1314
		goto out_nonewsk;
L
Linus Torvalds 已提交
1315

1316 1317 1318 1319 1320
	/*
	 * 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
1321

1322
	newsk->sk_gso_type = SKB_GSO_TCPV6;
1323
	__ip6_dst_store(newsk, dst, NULL, NULL);
L
Linus Torvalds 已提交
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333

	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));

A
Alexey Dobriyan 已提交
1334 1335 1336
	newnp->daddr = treq->rmt_addr;
	newnp->saddr = treq->loc_addr;
	newnp->rcv_saddr = treq->loc_addr;
1337
	newsk->sk_bound_dev_if = treq->iif;
L
Linus Torvalds 已提交
1338

1339
	/* Now IPv6 options...
L
Linus Torvalds 已提交
1340 1341 1342

	   First: no IPv4 options.
	 */
1343
	newinet->inet_opt = NULL;
1344
	newnp->ipv6_ac_list = NULL;
1345
	newnp->ipv6_fl_list = NULL;
L
Linus Torvalds 已提交
1346 1347 1348 1349 1350 1351

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

	/* Clone pktoptions received with SYN */
	newnp->pktoptions = NULL;
1352 1353
	if (treq->pktopts != NULL) {
		newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1354
		consume_skb(treq->pktopts);
1355
		treq->pktopts = NULL;
L
Linus Torvalds 已提交
1356 1357 1358 1359
		if (newnp->pktoptions)
			skb_set_owner_r(newnp->pktoptions, newsk);
	}
	newnp->opt	  = NULL;
1360
	newnp->mcast_oif  = inet6_iif(skb);
1361
	newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1362
	newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375

	/* 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);
	}

1376
	inet_csk(newsk)->icsk_ext_hdr_len = 0;
L
Linus Torvalds 已提交
1377
	if (newnp->opt)
1378 1379
		inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
						     newnp->opt->opt_flen);
L
Linus Torvalds 已提交
1380

J
John Heffner 已提交
1381
	tcp_mtup_init(newsk);
L
Linus Torvalds 已提交
1382
	tcp_sync_mss(newsk, dst_mtu(dst));
1383
	newtp->advmss = dst_metric_advmss(dst);
1384 1385 1386 1387
	if (tcp_sk(sk)->rx_opt.user_mss &&
	    tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
		newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;

L
Linus Torvalds 已提交
1388
	tcp_initialize_rcv_mss(newsk);
1389 1390 1391 1392
	if (tcp_rsk(req)->snt_synack)
		tcp_valid_rtt_meas(newsk,
		    tcp_time_stamp - tcp_rsk(req)->snt_synack);
	newtp->total_retrans = req->retrans;
L
Linus Torvalds 已提交
1393

E
Eric Dumazet 已提交
1394 1395
	newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
	newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
L
Linus Torvalds 已提交
1396

1397 1398 1399 1400 1401 1402 1403 1404
#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.
		 */
E
Eric Dumazet 已提交
1405 1406
		tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr,
			       AF_INET6, key->key, key->keylen, GFP_ATOMIC);
1407 1408 1409
	}
#endif

1410 1411 1412 1413
	if (__inet_inherit_port(sk, newsk) < 0) {
		sock_put(newsk);
		goto out;
	}
1414
	__inet6_hash(newsk, NULL);
L
Linus Torvalds 已提交
1415 1416 1417 1418

	return newsk;

out_overflow:
1419
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1420
out_nonewsk:
L
Linus Torvalds 已提交
1421 1422 1423
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
1424 1425
out:
	NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
L
Linus Torvalds 已提交
1426 1427 1428
	return NULL;
}

1429
static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
L
Linus Torvalds 已提交
1430
{
1431
	if (skb->ip_summed == CHECKSUM_COMPLETE) {
H
Herbert Xu 已提交
1432
		if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1433
				  &ipv6_hdr(skb)->daddr, skb->csum)) {
1434
			skb->ip_summed = CHECKSUM_UNNECESSARY;
L
Linus Torvalds 已提交
1435
			return 0;
1436
		}
L
Linus Torvalds 已提交
1437
	}
1438

H
Herbert Xu 已提交
1439
	skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1440 1441
					      &ipv6_hdr(skb)->saddr,
					      &ipv6_hdr(skb)->daddr, 0));
1442

L
Linus Torvalds 已提交
1443
	if (skb->len <= 76) {
1444
		return __skb_checksum_complete(skb);
L
Linus Torvalds 已提交
1445 1446 1447 1448 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
	}
	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);

1474 1475 1476 1477 1478
#ifdef CONFIG_TCP_MD5SIG
	if (tcp_v6_inbound_md5_hash (sk, skb))
		goto discard;
#endif

1479
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
		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.
1498
					       --ANK (980728)
L
Linus Torvalds 已提交
1499 1500 1501 1502 1503
	 */
	if (np->rxopt.all)
		opt_skb = skb_clone(skb, GFP_ATOMIC);

	if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1504
		sock_rps_save_rxhash(sk, skb);
1505
		if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1506 1507 1508 1509 1510 1511
			goto reset;
		if (opt_skb)
			goto ipv6_pktoptions;
		return 0;
	}

1512
	if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
L
Linus Torvalds 已提交
1513 1514
		goto csum_err;

1515
	if (sk->sk_state == TCP_LISTEN) {
L
Linus Torvalds 已提交
1516 1517 1518 1519 1520 1521 1522 1523 1524
		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..
		 */
1525
		if(nsk != sk) {
1526
			sock_rps_save_rxhash(nsk, skb);
L
Linus Torvalds 已提交
1527 1528 1529 1530 1531 1532
			if (tcp_child_process(sk, nsk, skb))
				goto reset;
			if (opt_skb)
				__kfree_skb(opt_skb);
			return 0;
		}
1533
	} else
1534
		sock_rps_save_rxhash(sk, skb);
L
Linus Torvalds 已提交
1535

1536
	if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
L
Linus Torvalds 已提交
1537 1538 1539 1540 1541 1542
		goto reset;
	if (opt_skb)
		goto ipv6_pktoptions;
	return 0;

reset:
1543
	tcp_v6_send_reset(sk, skb);
L
Linus Torvalds 已提交
1544 1545 1546 1547 1548 1549
discard:
	if (opt_skb)
		__kfree_skb(opt_skb);
	kfree_skb(skb);
	return 0;
csum_err:
1550
	TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
	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))) {
1565
		if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1566
			np->mcast_oif = inet6_iif(opt_skb);
1567
		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1568
			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1569 1570
		if (np->rxopt.bits.rxtclass)
			np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb));
L
Linus Torvalds 已提交
1571 1572 1573 1574 1575 1576 1577 1578 1579
		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);
		}
	}

1580
	kfree_skb(opt_skb);
L
Linus Torvalds 已提交
1581 1582 1583
	return 0;
}

1584
static int tcp_v6_rcv(struct sk_buff *skb)
L
Linus Torvalds 已提交
1585
{
1586
	const struct tcphdr *th;
1587
	const struct ipv6hdr *hdr;
L
Linus Torvalds 已提交
1588 1589
	struct sock *sk;
	int ret;
1590
	struct net *net = dev_net(skb->dev);
L
Linus Torvalds 已提交
1591 1592 1593 1594 1595 1596 1597

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

	/*
	 *	Count it even if it's bad.
	 */
1598
	TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
L
Linus Torvalds 已提交
1599 1600 1601 1602

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

1603
	th = tcp_hdr(skb);
L
Linus Torvalds 已提交
1604 1605 1606 1607 1608 1609

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

1610
	if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
L
Linus Torvalds 已提交
1611 1612
		goto bad_packet;

1613
	th = tcp_hdr(skb);
1614
	hdr = ipv6_hdr(skb);
L
Linus Torvalds 已提交
1615 1616 1617 1618 1619
	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;
1620
	TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
L
Linus Torvalds 已提交
1621 1622
	TCP_SKB_CB(skb)->sacked = 0;

1623
	sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
L
Linus Torvalds 已提交
1624 1625 1626 1627 1628 1629 1630
	if (!sk)
		goto no_tcp_socket;

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

1631 1632 1633 1634 1635
	if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
		NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
		goto discard_and_relse;
	}

L
Linus Torvalds 已提交
1636 1637 1638
	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
		goto discard_and_relse;

1639
	if (sk_filter(sk, skb))
L
Linus Torvalds 已提交
1640 1641 1642 1643
		goto discard_and_relse;

	skb->dev = NULL;

1644
	bh_lock_sock_nested(sk);
L
Linus Torvalds 已提交
1645 1646
	ret = 0;
	if (!sock_owned_by_user(sk)) {
C
Chris Leech 已提交
1647
#ifdef CONFIG_NET_DMA
1648
		struct tcp_sock *tp = tcp_sk(sk);
1649
		if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1650
			tp->ucopy.dma_chan = net_dma_find_channel();
1651 1652 1653
		if (tp->ucopy.dma_chan)
			ret = tcp_v6_do_rcv(sk, skb);
		else
C
Chris Leech 已提交
1654 1655 1656 1657 1658
#endif
		{
			if (!tcp_prequeue(sk, skb))
				ret = tcp_v6_do_rcv(sk, skb);
		}
1659 1660
	} else if (unlikely(sk_add_backlog(sk, skb,
					   sk->sk_rcvbuf + sk->sk_sndbuf))) {
Z
Zhu Yi 已提交
1661
		bh_unlock_sock(sk);
1662
		NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
Z
Zhu Yi 已提交
1663 1664
		goto discard_and_relse;
	}
L
Linus Torvalds 已提交
1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675
	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:
1676
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
L
Linus Torvalds 已提交
1677
	} else {
1678
		tcp_v6_send_reset(NULL, skb);
L
Linus Torvalds 已提交
1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
	}

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)) {
1696
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1697 1698 1699 1700
		goto discard_it;
	}

	if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1701
		TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1702
		inet_twsk_put(inet_twsk(sk));
L
Linus Torvalds 已提交
1703 1704 1705
		goto discard_it;
	}

1706
	switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
L
Linus Torvalds 已提交
1707 1708 1709 1710
	case TCP_TW_SYN:
	{
		struct sock *sk2;

1711
		sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1712
					    &ipv6_hdr(skb)->daddr,
1713
					    ntohs(th->dest), inet6_iif(skb));
L
Linus Torvalds 已提交
1714
		if (sk2 != NULL) {
1715 1716 1717
			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
1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732
			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;
}

1733 1734
static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
{
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746
	struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct inet_peer *peer;

	if (!rt ||
	    !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) {
		peer = inet_getpeer_v6(&np->daddr, 1);
		*release_it = true;
	} else {
		if (!rt->rt6i_peer)
			rt6_bind_peer(rt, 1);
		peer = rt->rt6i_peer;
1747
		*release_it = false;
1748 1749 1750
	}

	return peer;
1751 1752 1753
}

static void *tcp_v6_tw_get_peer(struct sock *sk)
L
Linus Torvalds 已提交
1754
{
1755 1756
	const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
	const struct inet_timewait_sock *tw = inet_twsk(sk);
1757 1758 1759 1760

	if (tw->tw_family == AF_INET)
		return tcp_v4_tw_get_peer(sk);

1761
	return inet_getpeer_v6(&tw6->tw_v6_daddr, 1);
L
Linus Torvalds 已提交
1762 1763
}

1764 1765 1766 1767 1768 1769 1770
static struct timewait_sock_ops tcp6_timewait_sock_ops = {
	.twsk_obj_size	= sizeof(struct tcp6_timewait_sock),
	.twsk_unique	= tcp_twsk_unique,
	.twsk_destructor= tcp_twsk_destructor,
	.twsk_getpeer	= tcp_v6_tw_get_peer,
};

1771
static const struct inet_connection_sock_af_ops ipv6_specific = {
1772 1773 1774 1775 1776
	.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,
1777
	.get_peer	   = tcp_v6_get_peer,
1778
	.net_header_len	   = sizeof(struct ipv6hdr),
1779
	.net_frag_header_len = sizeof(struct frag_hdr),
1780 1781 1782 1783
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1784
	.bind_conflict	   = inet6_csk_bind_conflict,
1785
#ifdef CONFIG_COMPAT
1786 1787
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1788
#endif
L
Linus Torvalds 已提交
1789 1790
};

1791
#ifdef CONFIG_TCP_MD5SIG
1792
static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1793
	.md5_lookup	=	tcp_v6_md5_lookup,
1794
	.calc_md5_hash	=	tcp_v6_md5_hash_skb,
1795 1796
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1797
#endif
1798

L
Linus Torvalds 已提交
1799 1800 1801 1802
/*
 *	TCP over IPv4 via INET6 API
 */

1803
static const struct inet_connection_sock_af_ops ipv6_mapped = {
1804 1805 1806 1807 1808
	.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,
1809
	.get_peer	   = tcp_v4_get_peer,
1810 1811 1812 1813 1814
	.net_header_len	   = sizeof(struct iphdr),
	.setsockopt	   = ipv6_setsockopt,
	.getsockopt	   = ipv6_getsockopt,
	.addr2sockaddr	   = inet6_csk_addr2sockaddr,
	.sockaddr_len	   = sizeof(struct sockaddr_in6),
1815
	.bind_conflict	   = inet6_csk_bind_conflict,
1816
#ifdef CONFIG_COMPAT
1817 1818
	.compat_setsockopt = compat_ipv6_setsockopt,
	.compat_getsockopt = compat_ipv6_getsockopt,
1819
#endif
L
Linus Torvalds 已提交
1820 1821
};

1822
#ifdef CONFIG_TCP_MD5SIG
1823
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1824
	.md5_lookup	=	tcp_v4_md5_lookup,
1825
	.calc_md5_hash	=	tcp_v4_md5_hash_skb,
1826 1827
	.md5_parse	=	tcp_v6_parse_md5_keys,
};
1828
#endif
1829

L
Linus Torvalds 已提交
1830 1831 1832 1833 1834
/* 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)
{
1835
	struct inet_connection_sock *icsk = inet_csk(sk);
L
Linus Torvalds 已提交
1836

1837
	tcp_init_sock(sk);
L
Linus Torvalds 已提交
1838

1839
	icsk->icsk_af_ops = &ipv6_specific;
L
Linus Torvalds 已提交
1840

1841
#ifdef CONFIG_TCP_MD5SIG
1842
	tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1843 1844
#endif

L
Linus Torvalds 已提交
1845 1846 1847
	return 0;
}

1848
static void tcp_v6_destroy_sock(struct sock *sk)
L
Linus Torvalds 已提交
1849 1850
{
	tcp_v4_destroy_sock(sk);
1851
	inet6_destroy_sock(sk);
L
Linus Torvalds 已提交
1852 1853
}

1854
#ifdef CONFIG_PROC_FS
L
Linus Torvalds 已提交
1855
/* Proc filesystem TCPv6 sock list dumping. */
1856
static void get_openreq6(struct seq_file *seq,
1857
			 const struct sock *sk, struct request_sock *req, int i, int uid)
L
Linus Torvalds 已提交
1858 1859
{
	int ttd = req->expires - jiffies;
1860 1861
	const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
	const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
L
Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867

	if (ttd < 0)
		ttd = 0;

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
1868
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
1869 1870 1871
		   i,
		   src->s6_addr32[0], src->s6_addr32[1],
		   src->s6_addr32[2], src->s6_addr32[3],
1872
		   ntohs(inet_rsk(req)->loc_port),
L
Linus Torvalds 已提交
1873 1874
		   dest->s6_addr32[0], dest->s6_addr32[1],
		   dest->s6_addr32[2], dest->s6_addr32[3],
1875
		   ntohs(inet_rsk(req)->rmt_port),
L
Linus Torvalds 已提交
1876 1877
		   TCP_SYN_RECV,
		   0,0, /* could print option size, but that is af dependent. */
1878 1879
		   1,   /* timers active (only the expire timer) */
		   jiffies_to_clock_t(ttd),
L
Linus Torvalds 已提交
1880 1881
		   req->retrans,
		   uid,
1882
		   0,  /* non standard timer */
L
Linus Torvalds 已提交
1883 1884 1885 1886 1887 1888
		   0, /* open_requests have no inode */
		   0, req);
}

static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
{
1889
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
1890 1891 1892
	__u16 destp, srcp;
	int timer_active;
	unsigned long timer_expires;
1893 1894
	const struct inet_sock *inet = inet_sk(sp);
	const struct tcp_sock *tp = tcp_sk(sp);
1895
	const struct inet_connection_sock *icsk = inet_csk(sp);
1896
	const struct ipv6_pinfo *np = inet6_sk(sp);
L
Linus Torvalds 已提交
1897 1898 1899

	dest  = &np->daddr;
	src   = &np->rcv_saddr;
E
Eric Dumazet 已提交
1900 1901
	destp = ntohs(inet->inet_dport);
	srcp  = ntohs(inet->inet_sport);
1902 1903

	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
L
Linus Torvalds 已提交
1904
		timer_active	= 1;
1905 1906
		timer_expires	= icsk->icsk_timeout;
	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
L
Linus Torvalds 已提交
1907
		timer_active	= 4;
1908
		timer_expires	= icsk->icsk_timeout;
L
Linus Torvalds 已提交
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918
	} 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 "
D
Dan Rosenberg 已提交
1919
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
L
Linus Torvalds 已提交
1920 1921 1922 1923 1924
		   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,
1925
		   sp->sk_state,
1926 1927
		   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
1928 1929
		   timer_active,
		   jiffies_to_clock_t(timer_expires - jiffies),
1930
		   icsk->icsk_retransmits,
L
Linus Torvalds 已提交
1931
		   sock_i_uid(sp),
1932
		   icsk->icsk_probes_out,
L
Linus Torvalds 已提交
1933 1934
		   sock_i_ino(sp),
		   atomic_read(&sp->sk_refcnt), sp,
1935 1936
		   jiffies_to_clock_t(icsk->icsk_rto),
		   jiffies_to_clock_t(icsk->icsk_ack.ato),
1937
		   (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
I
Ilpo Järvinen 已提交
1938 1939
		   tp->snd_cwnd,
		   tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
L
Linus Torvalds 已提交
1940 1941 1942
		   );
}

1943
static void get_timewait6_sock(struct seq_file *seq,
1944
			       struct inet_timewait_sock *tw, int i)
L
Linus Torvalds 已提交
1945
{
1946
	const struct in6_addr *dest, *src;
L
Linus Torvalds 已提交
1947
	__u16 destp, srcp;
1948
	const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
L
Linus Torvalds 已提交
1949 1950 1951 1952 1953
	int ttd = tw->tw_ttd - jiffies;

	if (ttd < 0)
		ttd = 0;

1954 1955
	dest = &tw6->tw_v6_daddr;
	src  = &tw6->tw_v6_rcv_saddr;
L
Linus Torvalds 已提交
1956 1957 1958 1959 1960
	destp = ntohs(tw->tw_dport);
	srcp  = ntohs(tw->tw_sport);

	seq_printf(seq,
		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
D
Dan Rosenberg 已提交
1961
		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
L
Linus Torvalds 已提交
1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002
		   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;
}

2003 2004 2005 2006 2007 2008 2009 2010
static const struct file_operations tcp6_afinfo_seq_fops = {
	.owner   = THIS_MODULE,
	.open    = tcp_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_net
};

L
Linus Torvalds 已提交
2011 2012 2013
static struct tcp_seq_afinfo tcp6_seq_afinfo = {
	.name		= "tcp6",
	.family		= AF_INET6,
2014
	.seq_fops	= &tcp6_afinfo_seq_fops,
2015 2016 2017
	.seq_ops	= {
		.show		= tcp6_seq_show,
	},
L
Linus Torvalds 已提交
2018 2019
};

2020
int __net_init tcp6_proc_init(struct net *net)
L
Linus Torvalds 已提交
2021
{
2022
	return tcp_proc_register(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2023 2024
}

2025
void tcp6_proc_exit(struct net *net)
L
Linus Torvalds 已提交
2026
{
2027
	tcp_proc_unregister(net, &tcp6_seq_afinfo);
L
Linus Torvalds 已提交
2028 2029 2030 2031 2032 2033 2034 2035 2036
}
#endif

struct proto tcpv6_prot = {
	.name			= "TCPv6",
	.owner			= THIS_MODULE,
	.close			= tcp_close,
	.connect		= tcp_v6_connect,
	.disconnect		= tcp_disconnect,
2037
	.accept			= inet_csk_accept,
L
Linus Torvalds 已提交
2038 2039 2040 2041 2042 2043 2044
	.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,
2045 2046
	.sendmsg		= tcp_sendmsg,
	.sendpage		= tcp_sendpage,
L
Linus Torvalds 已提交
2047 2048
	.backlog_rcv		= tcp_v6_do_rcv,
	.hash			= tcp_v6_hash,
2049 2050
	.unhash			= inet_unhash,
	.get_port		= inet_csk_get_port,
L
Linus Torvalds 已提交
2051 2052 2053 2054
	.enter_memory_pressure	= tcp_enter_memory_pressure,
	.sockets_allocated	= &tcp_sockets_allocated,
	.memory_allocated	= &tcp_memory_allocated,
	.memory_pressure	= &tcp_memory_pressure,
2055
	.orphan_count		= &tcp_orphan_count,
L
Linus Torvalds 已提交
2056 2057 2058 2059
	.sysctl_wmem		= sysctl_tcp_wmem,
	.sysctl_rmem		= sysctl_tcp_rmem,
	.max_header		= MAX_TCP_HEADER,
	.obj_size		= sizeof(struct tcp6_sock),
2060
	.slab_flags		= SLAB_DESTROY_BY_RCU,
2061
	.twsk_prot		= &tcp6_timewait_sock_ops,
2062
	.rsk_prot		= &tcp6_request_sock_ops,
2063
	.h.hashinfo		= &tcp_hashinfo,
2064
	.no_autobind		= true,
2065 2066 2067 2068
#ifdef CONFIG_COMPAT
	.compat_setsockopt	= compat_tcp_setsockopt,
	.compat_getsockopt	= compat_tcp_getsockopt,
#endif
G
Glauber Costa 已提交
2069 2070 2071
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
	.proto_cgroup		= tcp_proto_cgroup,
#endif
L
Linus Torvalds 已提交
2072 2073
};

2074
static const struct inet6_protocol tcpv6_protocol = {
L
Linus Torvalds 已提交
2075 2076
	.handler	=	tcp_v6_rcv,
	.err_handler	=	tcp_v6_err,
2077
	.gso_send_check	=	tcp_v6_gso_send_check,
H
Herbert Xu 已提交
2078
	.gso_segment	=	tcp_tso_segment,
H
Herbert Xu 已提交
2079 2080
	.gro_receive	=	tcp6_gro_receive,
	.gro_complete	=	tcp6_gro_complete,
L
Linus Torvalds 已提交
2081 2082 2083 2084 2085 2086 2087 2088 2089
	.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,
	.no_check	=	0,
2090 2091
	.flags		=	INET_PROTOSW_PERMANENT |
				INET_PROTOSW_ICSK,
L
Linus Torvalds 已提交
2092 2093
};

2094
static int __net_init tcpv6_net_init(struct net *net)
2095
{
2096 2097
	return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
				    SOCK_RAW, IPPROTO_TCP, net);
2098 2099
}

2100
static void __net_exit tcpv6_net_exit(struct net *net)
2101
{
2102
	inet_ctl_sock_destroy(net->ipv6.tcp_sk);
E
Eric W. Biederman 已提交
2103 2104
}

2105
static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
E
Eric W. Biederman 已提交
2106 2107
{
	inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
2108 2109 2110
}

static struct pernet_operations tcpv6_net_ops = {
E
Eric W. Biederman 已提交
2111 2112 2113
	.init	    = tcpv6_net_init,
	.exit	    = tcpv6_net_exit,
	.exit_batch = tcpv6_net_exit_batch,
2114 2115
};

2116
int __init tcpv6_init(void)
L
Linus Torvalds 已提交
2117
{
2118 2119 2120 2121 2122 2123
	int ret;

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

L
Linus Torvalds 已提交
2124
	/* register inet6 protocol */
2125 2126 2127 2128
	ret = inet6_register_protosw(&tcpv6_protosw);
	if (ret)
		goto out_tcpv6_protocol;

2129
	ret = register_pernet_subsys(&tcpv6_net_ops);
2130 2131 2132 2133
	if (ret)
		goto out_tcpv6_protosw;
out:
	return ret;
2134

2135 2136 2137 2138 2139 2140 2141
out_tcpv6_protocol:
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
out_tcpv6_protosw:
	inet6_unregister_protosw(&tcpv6_protosw);
	goto out;
}

2142
void tcpv6_exit(void)
2143
{
2144
	unregister_pernet_subsys(&tcpv6_net_ops);
2145 2146
	inet6_unregister_protosw(&tcpv6_protosw);
	inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
L
Linus Torvalds 已提交
2147
}