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Merge branch 'davem-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[deliverable/linux.git] / net / ipv6 / tcp_ipv6.c
CommitLineData
1da177e4
LT		 1/*
2 * TCP over IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on:
1da177e4
LT		 9 * linux/net/ipv4/tcp.c
10 * linux/net/ipv4/tcp_input.c
11 * linux/net/ipv4/tcp_output.c
12 *
13 * Fixes:
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
16 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
17 * a single port at the same time.
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26#include <linux/module.h>
1da177e4
LT		 27#include <linux/errno.h>
28#include <linux/types.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/net.h>
32#include <linux/jiffies.h>
33#include <linux/in.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/init.h>
37#include <linux/jhash.h>
38#include <linux/ipsec.h>
39#include <linux/times.h>
40
41#include <linux/ipv6.h>
42#include <linux/icmpv6.h>
43#include <linux/random.h>
44
45#include <net/tcp.h>
46#include <net/ndisc.h>
5324a040 47#include <net/inet6_hashtables.h>
8129765a 48#include <net/inet6_connection_sock.h>
1da177e4
LT		 49#include <net/ipv6.h>
50#include <net/transp_v6.h>
51#include <net/addrconf.h>
52#include <net/ip6_route.h>
53#include <net/ip6_checksum.h>
54#include <net/inet_ecn.h>
55#include <net/protocol.h>
56#include <net/xfrm.h>
1da177e4
LT		 57#include <net/snmp.h>
58#include <net/dsfield.h>
6d6ee43e 59#include <net/timewait_sock.h>
18134bed 60#include <net/netdma.h>
3d58b5fa 61#include <net/inet_common.h>
1da177e4
LT		 62
63#include <asm/uaccess.h>
64
65#include <linux/proc_fs.h>
66#include <linux/seq_file.h>
67
cfb6eeb4
YH		 68#include <linux/crypto.h>
69#include <linux/scatterlist.h>
70
cfb6eeb4 71static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
60236fdd 72static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
1ab1457c 73static void tcp_v6_send_check(struct sock *sk, int len,
1da177e4
LT		 74 struct sk_buff *skb);
75
76static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
1da177e4 77
8292a17a
ACM		 78static struct inet_connection_sock_af_ops ipv6_mapped;
79static struct inet_connection_sock_af_ops ipv6_specific;
a928630a 80#ifdef CONFIG_TCP_MD5SIG
cfb6eeb4
YH		 81static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
82static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
9501f972
YH		 83#else
84static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
85 struct in6_addr *addr)
86{
87 return NULL;
88}
a928630a 89#endif
1da177e4 90
1da177e4
LT		 91static void tcp_v6_hash(struct sock *sk)
92{
93 if (sk->sk_state != TCP_CLOSE) {
8292a17a 94 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
1da177e4
LT		 95 tcp_prot.hash(sk);
96 return;
97 }
98 local_bh_disable();
ab1e0a13 99 __inet6_hash(sk);
1da177e4
LT		 100 local_bh_enable();
101 }
102}
103
868c86bc 104static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
1ab1457c
YH		 105 struct in6_addr *saddr,
106 struct in6_addr *daddr,
868c86bc 107 __wsum base)
1da177e4
LT		 108{
109 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
110}
111
a94f723d 112static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
1da177e4 113{
0660e03f
ACM		 114 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
115 ipv6_hdr(skb)->saddr.s6_addr32,
aa8223c7
ACM		 116 tcp_hdr(skb)->dest,
117 tcp_hdr(skb)->source);
1da177e4
LT		 118}
119
1ab1457c 120static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
1da177e4
LT		 121 int addr_len)
122{
123 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
1ab1457c 124 struct inet_sock *inet = inet_sk(sk);
d83d8461 125 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 126 struct ipv6_pinfo *np = inet6_sk(sk);
127 struct tcp_sock *tp = tcp_sk(sk);
128 struct in6_addr *saddr = NULL, *final_p = NULL, final;
129 struct flowi fl;
130 struct dst_entry *dst;
131 int addr_type;
132 int err;
133
1ab1457c 134 if (addr_len < SIN6_LEN_RFC2133)
1da177e4
LT		 135 return -EINVAL;
136
1ab1457c 137 if (usin->sin6_family != AF_INET6)
1da177e4
LT		 138 return(-EAFNOSUPPORT);
139
140 memset(&fl, 0, sizeof(fl));
141
142 if (np->sndflow) {
143 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
144 IP6_ECN_flow_init(fl.fl6_flowlabel);
145 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
146 struct ip6_flowlabel *flowlabel;
147 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
148 if (flowlabel == NULL)
149 return -EINVAL;
150 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
151 fl6_sock_release(flowlabel);
152 }
153 }
154
155 /*
1ab1457c
YH		 156 * connect() to INADDR_ANY means loopback (BSD'ism).
157 */
158
159 if(ipv6_addr_any(&usin->sin6_addr))
160 usin->sin6_addr.s6_addr[15] = 0x1;
1da177e4
LT		 161
162 addr_type = ipv6_addr_type(&usin->sin6_addr);
163
164 if(addr_type & IPV6_ADDR_MULTICAST)
165 return -ENETUNREACH;
166
167 if (addr_type&IPV6_ADDR_LINKLOCAL) {
168 if (addr_len >= sizeof(struct sockaddr_in6) &&
169 usin->sin6_scope_id) {
170 /* If interface is set while binding, indices
171 * must coincide.
172 */
173 if (sk->sk_bound_dev_if &&
174 sk->sk_bound_dev_if != usin->sin6_scope_id)
175 return -EINVAL;
176
177 sk->sk_bound_dev_if = usin->sin6_scope_id;
178 }
179
180 /* Connect to link-local address requires an interface */
181 if (!sk->sk_bound_dev_if)
182 return -EINVAL;
183 }
184
185 if (tp->rx_opt.ts_recent_stamp &&
186 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
187 tp->rx_opt.ts_recent = 0;
188 tp->rx_opt.ts_recent_stamp = 0;
189 tp->write_seq = 0;
190 }
191
192 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
193 np->flow_label = fl.fl6_flowlabel;
194
195 /*
196 * TCP over IPv4
197 */
198
199 if (addr_type == IPV6_ADDR_MAPPED) {
d83d8461 200 u32 exthdrlen = icsk->icsk_ext_hdr_len;
1da177e4
LT		 201 struct sockaddr_in sin;
202
203 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
204
205 if (__ipv6_only_sock(sk))
206 return -ENETUNREACH;
207
208 sin.sin_family = AF_INET;
209 sin.sin_port = usin->sin6_port;
210 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
211
d83d8461 212 icsk->icsk_af_ops = &ipv6_mapped;
1da177e4 213 sk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 214#ifdef CONFIG_TCP_MD5SIG
215 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
216#endif
1da177e4
LT		 217
218 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
219
220 if (err) {
d83d8461
ACM		 221 icsk->icsk_ext_hdr_len = exthdrlen;
222 icsk->icsk_af_ops = &ipv6_specific;
1da177e4 223 sk->sk_backlog_rcv = tcp_v6_do_rcv;
cfb6eeb4
YH		 224#ifdef CONFIG_TCP_MD5SIG
225 tp->af_specific = &tcp_sock_ipv6_specific;
226#endif
1da177e4
LT		 227 goto failure;
228 } else {
229 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
230 inet->saddr);
231 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
232 inet->rcv_saddr);
233 }
234
235 return err;
236 }
237
238 if (!ipv6_addr_any(&np->rcv_saddr))
239 saddr = &np->rcv_saddr;
240
241 fl.proto = IPPROTO_TCP;
242 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
243 ipv6_addr_copy(&fl.fl6_src,
244 (saddr ? saddr : &np->saddr));
245 fl.oif = sk->sk_bound_dev_if;
246 fl.fl_ip_dport = usin->sin6_port;
247 fl.fl_ip_sport = inet->sport;
248
249 if (np->opt && np->opt->srcrt) {
250 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
251 ipv6_addr_copy(&final, &fl.fl6_dst);
252 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
253 final_p = &final;
254 }
255
beb8d13b
VY		 256 security_sk_classify_flow(sk, &fl);
257
1da177e4
LT		 258 err = ip6_dst_lookup(sk, &dst, &fl);
259 if (err)
260 goto failure;
261 if (final_p)
262 ipv6_addr_copy(&fl.fl6_dst, final_p);
263
bb72845e 264 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
14e50e57
DM		 265 if (err == -EREMOTE)
266 err = ip6_dst_blackhole(sk, &dst, &fl);
267 if (err < 0)
268 goto failure;
269 }
1da177e4
LT		 270
271 if (saddr == NULL) {
272 saddr = &fl.fl6_src;
273 ipv6_addr_copy(&np->rcv_saddr, saddr);
274 }
275
276 /* set the source address */
277 ipv6_addr_copy(&np->saddr, saddr);
278 inet->rcv_saddr = LOOPBACK4_IPV6;
279
f83ef8c0 280 sk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 281 __ip6_dst_store(sk, dst, NULL, NULL);
1da177e4 282
d83d8461 283 icsk->icsk_ext_hdr_len = 0;
1da177e4 284 if (np->opt)
d83d8461
ACM		 285 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
286 np->opt->opt_nflen);
1da177e4
LT		 287
288 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
289
290 inet->dport = usin->sin6_port;
291
292 tcp_set_state(sk, TCP_SYN_SENT);
d8313f5c 293 err = inet6_hash_connect(&tcp_death_row, sk);
1da177e4
LT		 294 if (err)
295 goto late_failure;
296
297 if (!tp->write_seq)
298 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
299 np->daddr.s6_addr32,
300 inet->sport,
301 inet->dport);
302
303 err = tcp_connect(sk);
304 if (err)
305 goto late_failure;
306
307 return 0;
308
309late_failure:
310 tcp_set_state(sk, TCP_CLOSE);
311 __sk_dst_reset(sk);
312failure:
313 inet->dport = 0;
314 sk->sk_route_caps = 0;
315 return err;
316}
317
318static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
04ce6909 319 int type, int code, int offset, __be32 info)
1da177e4
LT		 320{
321 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
505cbfc5 322 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
1da177e4
LT		 323 struct ipv6_pinfo *np;
324 struct sock *sk;
325 int err;
1ab1457c 326 struct tcp_sock *tp;
1da177e4
LT		 327 __u32 seq;
328
c346dca1 329 sk = inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, &hdr->daddr,
d86e0dac 330 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
1da177e4
LT		 331
332 if (sk == NULL) {
333 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
334 return;
335 }
336
337 if (sk->sk_state == TCP_TIME_WAIT) {
9469c7b4 338 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 339 return;
340 }
341
342 bh_lock_sock(sk);
343 if (sock_owned_by_user(sk))
344 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
345
346 if (sk->sk_state == TCP_CLOSE)
347 goto out;
348
349 tp = tcp_sk(sk);
1ab1457c 350 seq = ntohl(th->seq);
1da177e4
LT		 351 if (sk->sk_state != TCP_LISTEN &&
352 !between(seq, tp->snd_una, tp->snd_nxt)) {
353 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
354 goto out;
355 }
356
357 np = inet6_sk(sk);
358
359 if (type == ICMPV6_PKT_TOOBIG) {
360 struct dst_entry *dst = NULL;
361
362 if (sock_owned_by_user(sk))
363 goto out;
364 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
365 goto out;
366
367 /* icmp should have updated the destination cache entry */
368 dst = __sk_dst_check(sk, np->dst_cookie);
369
370 if (dst == NULL) {
371 struct inet_sock *inet = inet_sk(sk);
372 struct flowi fl;
373
374 /* BUGGG_FUTURE: Again, it is not clear how
375 to handle rthdr case. Ignore this complexity
376 for now.
377 */
378 memset(&fl, 0, sizeof(fl));
379 fl.proto = IPPROTO_TCP;
380 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
381 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
382 fl.oif = sk->sk_bound_dev_if;
383 fl.fl_ip_dport = inet->dport;
384 fl.fl_ip_sport = inet->sport;
beb8d13b 385 security_skb_classify_flow(skb, &fl);
1da177e4
LT		 386
387 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
388 sk->sk_err_soft = -err;
389 goto out;
390 }
391
392 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
393 sk->sk_err_soft = -err;
394 goto out;
395 }
396
397 } else
398 dst_hold(dst);
399
d83d8461 400 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
1da177e4
LT		 401 tcp_sync_mss(sk, dst_mtu(dst));
402 tcp_simple_retransmit(sk);
403 } /* else let the usual retransmit timer handle it */
404 dst_release(dst);
405 goto out;
406 }
407
408 icmpv6_err_convert(type, code, &err);
409
60236fdd 410 /* Might be for an request_sock */
1da177e4 411 switch (sk->sk_state) {
60236fdd 412 struct request_sock *req, **prev;
1da177e4
LT		 413 case TCP_LISTEN:
414 if (sock_owned_by_user(sk))
415 goto out;
416
8129765a
ACM		 417 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
418 &hdr->saddr, inet6_iif(skb));
1da177e4
LT		 419 if (!req)
420 goto out;
421
422 /* ICMPs are not backlogged, hence we cannot get
423 * an established socket here.
424 */
425 BUG_TRAP(req->sk == NULL);
426
2e6599cb 427 if (seq != tcp_rsk(req)->snt_isn) {
1da177e4
LT		 428 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
429 goto out;
430 }
431
463c84b9 432 inet_csk_reqsk_queue_drop(sk, req, prev);
1da177e4
LT		 433 goto out;
434
435 case TCP_SYN_SENT:
436 case TCP_SYN_RECV: /* Cannot happen.
1ab1457c 437 It can, it SYNs are crossed. --ANK */
1da177e4 438 if (!sock_owned_by_user(sk)) {
1da177e4
LT		 439 sk->sk_err = err;
440 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
441
442 tcp_done(sk);
443 } else
444 sk->sk_err_soft = err;
445 goto out;
446 }
447
448 if (!sock_owned_by_user(sk) && np->recverr) {
449 sk->sk_err = err;
450 sk->sk_error_report(sk);
451 } else
452 sk->sk_err_soft = err;
453
454out:
455 bh_unlock_sock(sk);
456 sock_put(sk);
457}
458
459
fd80eb94 460static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
1da177e4 461{
ca304b61 462 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 463 struct ipv6_pinfo *np = inet6_sk(sk);
464 struct sk_buff * skb;
465 struct ipv6_txoptions *opt = NULL;
466 struct in6_addr * final_p = NULL, final;
467 struct flowi fl;
fd80eb94 468 struct dst_entry *dst;
1da177e4
LT		 469 int err = -1;
470
471 memset(&fl, 0, sizeof(fl));
472 fl.proto = IPPROTO_TCP;
2e6599cb
ACM		 473 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
474 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1da177e4 475 fl.fl6_flowlabel = 0;
2e6599cb
ACM		 476 fl.oif = treq->iif;
477 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1da177e4 478 fl.fl_ip_sport = inet_sk(sk)->sport;
4237c75c 479 security_req_classify_flow(req, &fl);
1da177e4 480
fd80eb94
DL		 481 opt = np->opt;
482 if (opt && opt->srcrt) {
483 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
484 ipv6_addr_copy(&final, &fl.fl6_dst);
485 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
486 final_p = &final;
1da177e4
LT		 487 }
488
fd80eb94
DL		 489 err = ip6_dst_lookup(sk, &dst, &fl);
490 if (err)
491 goto done;
492 if (final_p)
493 ipv6_addr_copy(&fl.fl6_dst, final_p);
494 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
495 goto done;
496
1da177e4
LT		 497 skb = tcp_make_synack(sk, dst, req);
498 if (skb) {
aa8223c7 499 struct tcphdr *th = tcp_hdr(skb);
1da177e4
LT		 500
501 th->check = tcp_v6_check(th, skb->len,
2e6599cb 502 &treq->loc_addr, &treq->rmt_addr,
1da177e4
LT		 503 csum_partial((char *)th, skb->len, skb->csum));
504
2e6599cb 505 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1da177e4 506 err = ip6_xmit(sk, skb, &fl, opt, 0);
b9df3cb8 507 err = net_xmit_eval(err);
1da177e4
LT		 508 }
509
510done:
1ab1457c 511 if (opt && opt != np->opt)
1da177e4 512 sock_kfree_s(sk, opt, opt->tot_len);
78b91042 513 dst_release(dst);
1da177e4
LT		 514 return err;
515}
516
c6aefafb
GG		 517static inline void syn_flood_warning(struct sk_buff *skb)
518{
519#ifdef CONFIG_SYN_COOKIES
520 if (sysctl_tcp_syncookies)
521 printk(KERN_INFO
522 "TCPv6: Possible SYN flooding on port %d. "
523 "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
524 else
525#endif
526 printk(KERN_INFO
527 "TCPv6: Possible SYN flooding on port %d. "
528 "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
529}
530
60236fdd 531static void tcp_v6_reqsk_destructor(struct request_sock *req)
1da177e4 532{
ca304b61
ACM		 533 if (inet6_rsk(req)->pktopts)
534 kfree_skb(inet6_rsk(req)->pktopts);
1da177e4
LT		 535}
536
cfb6eeb4
YH		 537#ifdef CONFIG_TCP_MD5SIG
538static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
539 struct in6_addr *addr)
540{
541 struct tcp_sock *tp = tcp_sk(sk);
542 int i;
543
544 BUG_ON(tp == NULL);
545
546 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
547 return NULL;
548
549 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 550 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
f8ab18d2 551 return &tp->md5sig_info->keys6[i].base;
cfb6eeb4
YH		 552 }
553 return NULL;
554}
555
556static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
557 struct sock *addr_sk)
558{
559 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
560}
561
562static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
563 struct request_sock *req)
564{
565 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
566}
567
568static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
569 char *newkey, u8 newkeylen)
570{
571 /* Add key to the list */
b0a713e9 572 struct tcp_md5sig_key *key;
cfb6eeb4
YH		 573 struct tcp_sock *tp = tcp_sk(sk);
574 struct tcp6_md5sig_key *keys;
575
b0a713e9 576 key = tcp_v6_md5_do_lookup(sk, peer);
cfb6eeb4
YH		 577 if (key) {
578 /* modify existing entry - just update that one */
b0a713e9
MD		 579 kfree(key->key);
580 key->key = newkey;
581 key->keylen = newkeylen;
cfb6eeb4
YH		 582 } else {
583 /* reallocate new list if current one is full. */
584 if (!tp->md5sig_info) {
585 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
586 if (!tp->md5sig_info) {
587 kfree(newkey);
588 return -ENOMEM;
589 }
3d7dbeac 590 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
cfb6eeb4 591 }
aacbe8c8
YH		 592 if (tcp_alloc_md5sig_pool() == NULL) {
593 kfree(newkey);
594 return -ENOMEM;
595 }
cfb6eeb4
YH		 596 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
597 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
598 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
599
600 if (!keys) {
601 tcp_free_md5sig_pool();
602 kfree(newkey);
603 return -ENOMEM;
604 }
605
606 if (tp->md5sig_info->entries6)
607 memmove(keys, tp->md5sig_info->keys6,
608 (sizeof (tp->md5sig_info->keys6[0]) *
609 tp->md5sig_info->entries6));
610
611 kfree(tp->md5sig_info->keys6);
612 tp->md5sig_info->keys6 = keys;
613 tp->md5sig_info->alloced6++;
614 }
615
616 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
617 peer);
f8ab18d2
DM		 618 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
619 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
cfb6eeb4
YH		 620
621 tp->md5sig_info->entries6++;
622 }
623 return 0;
624}
625
626static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
627 u8 *newkey, __u8 newkeylen)
628{
629 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
630 newkey, newkeylen);
631}
632
633static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
634{
635 struct tcp_sock *tp = tcp_sk(sk);
636 int i;
637
638 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 639 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
cfb6eeb4 640 /* Free the key */
f8ab18d2 641 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 642 tp->md5sig_info->entries6--;
643
644 if (tp->md5sig_info->entries6 == 0) {
645 kfree(tp->md5sig_info->keys6);
646 tp->md5sig_info->keys6 = NULL;
ca983cef 647 tp->md5sig_info->alloced6 = 0;
cfb6eeb4
YH		 648 } else {
649 /* shrink the database */
650 if (tp->md5sig_info->entries6 != i)
651 memmove(&tp->md5sig_info->keys6[i],
652 &tp->md5sig_info->keys6[i+1],
653 (tp->md5sig_info->entries6 - i)
654 * sizeof (tp->md5sig_info->keys6[0]));
655 }
77adefdc
YH		 656 tcp_free_md5sig_pool();
657 return 0;
cfb6eeb4
YH		 658 }
659 }
660 return -ENOENT;
661}
662
663static void tcp_v6_clear_md5_list (struct sock *sk)
664{
665 struct tcp_sock *tp = tcp_sk(sk);
666 int i;
667
668 if (tp->md5sig_info->entries6) {
669 for (i = 0; i < tp->md5sig_info->entries6; i++)
f8ab18d2 670 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 671 tp->md5sig_info->entries6 = 0;
672 tcp_free_md5sig_pool();
673 }
674
675 kfree(tp->md5sig_info->keys6);
676 tp->md5sig_info->keys6 = NULL;
677 tp->md5sig_info->alloced6 = 0;
678
679 if (tp->md5sig_info->entries4) {
680 for (i = 0; i < tp->md5sig_info->entries4; i++)
f8ab18d2 681 kfree(tp->md5sig_info->keys4[i].base.key);
cfb6eeb4
YH		 682 tp->md5sig_info->entries4 = 0;
683 tcp_free_md5sig_pool();
684 }
685
686 kfree(tp->md5sig_info->keys4);
687 tp->md5sig_info->keys4 = NULL;
688 tp->md5sig_info->alloced4 = 0;
689}
690
691static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
692 int optlen)
693{
694 struct tcp_md5sig cmd;
695 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
696 u8 *newkey;
697
698 if (optlen < sizeof(cmd))
699 return -EINVAL;
700
701 if (copy_from_user(&cmd, optval, sizeof(cmd)))
702 return -EFAULT;
703
704 if (sin6->sin6_family != AF_INET6)
705 return -EINVAL;
706
707 if (!cmd.tcpm_keylen) {
708 if (!tcp_sk(sk)->md5sig_info)
709 return -ENOENT;
e773e4fa 710 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
cfb6eeb4
YH		 711 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
712 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
713 }
714
715 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
716 return -EINVAL;
717
718 if (!tcp_sk(sk)->md5sig_info) {
719 struct tcp_sock *tp = tcp_sk(sk);
720 struct tcp_md5sig_info *p;
721
722 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
723 if (!p)
724 return -ENOMEM;
725
726 tp->md5sig_info = p;
3d7dbeac 727 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
cfb6eeb4
YH		 728 }
729
af879cc7 730 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
cfb6eeb4
YH		 731 if (!newkey)
732 return -ENOMEM;
e773e4fa 733 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
cfb6eeb4
YH		 734 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
735 newkey, cmd.tcpm_keylen);
736 }
737 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
738}
739
740static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
741 struct in6_addr *saddr,
742 struct in6_addr *daddr,
076fb722 743 struct tcphdr *th, unsigned int tcplen)
cfb6eeb4 744{
cfb6eeb4
YH		 745 struct tcp_md5sig_pool *hp;
746 struct tcp6_pseudohdr *bp;
cfb6eeb4 747 int err;
cfb6eeb4
YH		 748
749 hp = tcp_get_md5sig_pool();
750 if (!hp) {
0dc47877 751 printk(KERN_WARNING "%s(): hash pool not found...\n", __func__);
cfb6eeb4
YH		 752 goto clear_hash_noput;
753 }
8d26d76d 754
cfb6eeb4 755 bp = &hp->md5_blk.ip6;
cfb6eeb4
YH		 756
757 /* 1. TCP pseudo-header (RFC2460) */
758 ipv6_addr_copy(&bp->saddr, saddr);
759 ipv6_addr_copy(&bp->daddr, daddr);
760 bp->len = htonl(tcplen);
076fb722 761 bp->protocol = htonl(IPPROTO_TCP);
cfb6eeb4 762
8d26d76d
YH		 763 err = tcp_calc_md5_hash(md5_hash, key, sizeof(*bp),
764 th, tcplen, hp);
c7da57a1 765
8d26d76d 766 if (err)
cfb6eeb4 767 goto clear_hash;
cfb6eeb4 768
8d26d76d 769 /* Free up the crypto pool */
cfb6eeb4 770 tcp_put_md5sig_pool();
cfb6eeb4
YH		 771out:
772 return 0;
773clear_hash:
774 tcp_put_md5sig_pool();
775clear_hash_noput:
776 memset(md5_hash, 0, 16);
777 goto out;
778}
779
780static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
781 struct sock *sk,
782 struct dst_entry *dst,
783 struct request_sock *req,
076fb722 784 struct tcphdr *th, unsigned int tcplen)
cfb6eeb4
YH		 785{
786 struct in6_addr *saddr, *daddr;
787
788 if (sk) {
789 saddr = &inet6_sk(sk)->saddr;
790 daddr = &inet6_sk(sk)->daddr;
791 } else {
792 saddr = &inet6_rsk(req)->loc_addr;
793 daddr = &inet6_rsk(req)->rmt_addr;
794 }
795 return tcp_v6_do_calc_md5_hash(md5_hash, key,
796 saddr, daddr,
076fb722 797 th, tcplen);
cfb6eeb4
YH		 798}
799
800static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
801{
802 __u8 *hash_location = NULL;
803 struct tcp_md5sig_key *hash_expected;
0660e03f 804 struct ipv6hdr *ip6h = ipv6_hdr(skb);
aa8223c7 805 struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4 806 int genhash;
cfb6eeb4
YH		 807 u8 newhash[16];
808
809 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
7d5d5525 810 hash_location = tcp_parse_md5sig_option(th);
cfb6eeb4 811
cfb6eeb4
YH		 812 /* do we have a hash as expected? */
813 if (!hash_expected) {
814 if (!hash_location)
815 return 0;
816 if (net_ratelimit()) {
817 printk(KERN_INFO "MD5 Hash NOT expected but found "
818 "(" NIP6_FMT ", %u)->"
819 "(" NIP6_FMT ", %u)\n",
820 NIP6(ip6h->saddr), ntohs(th->source),
821 NIP6(ip6h->daddr), ntohs(th->dest));
822 }
823 return 1;
824 }
825
826 if (!hash_location) {
827 if (net_ratelimit()) {
828 printk(KERN_INFO "MD5 Hash expected but NOT found "
829 "(" NIP6_FMT ", %u)->"
830 "(" NIP6_FMT ", %u)\n",
831 NIP6(ip6h->saddr), ntohs(th->source),
832 NIP6(ip6h->daddr), ntohs(th->dest));
833 }
834 return 1;
835 }
836
837 /* check the signature */
838 genhash = tcp_v6_do_calc_md5_hash(newhash,
839 hash_expected,
840 &ip6h->saddr, &ip6h->daddr,
076fb722 841 th, skb->len);
cfb6eeb4
YH		 842 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
843 if (net_ratelimit()) {
844 printk(KERN_INFO "MD5 Hash %s for "
845 "(" NIP6_FMT ", %u)->"
846 "(" NIP6_FMT ", %u)\n",
847 genhash ? "failed" : "mismatch",
848 NIP6(ip6h->saddr), ntohs(th->source),
849 NIP6(ip6h->daddr), ntohs(th->dest));
850 }
851 return 1;
852 }
853 return 0;
854}
855#endif
856
c6aefafb 857struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
1da177e4 858 .family = AF_INET6,
2e6599cb 859 .obj_size = sizeof(struct tcp6_request_sock),
1da177e4 860 .rtx_syn_ack = tcp_v6_send_synack,
60236fdd
ACM		 861 .send_ack = tcp_v6_reqsk_send_ack,
862 .destructor = tcp_v6_reqsk_destructor,
1da177e4
LT		 863 .send_reset = tcp_v6_send_reset
864};
865
cfb6eeb4 866#ifdef CONFIG_TCP_MD5SIG
b6332e6c 867static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
cfb6eeb4 868 .md5_lookup = tcp_v6_reqsk_md5_lookup,
cfb6eeb4 869};
b6332e6c 870#endif
cfb6eeb4 871
6d6ee43e
ACM		 872static struct timewait_sock_ops tcp6_timewait_sock_ops = {
873 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
874 .twsk_unique = tcp_twsk_unique,
cfb6eeb4 875 .twsk_destructor= tcp_twsk_destructor,
6d6ee43e
ACM		 876};
877
8292a17a 878static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
1da177e4
LT		 879{
880 struct ipv6_pinfo *np = inet6_sk(sk);
aa8223c7 881 struct tcphdr *th = tcp_hdr(skb);
1da177e4 882
84fa7933 883 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1da177e4 884 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
663ead3b 885 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 886 skb->csum_offset = offsetof(struct tcphdr, check);
1da177e4 887 } else {
1ab1457c
YH		 888 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
889 csum_partial((char *)th, th->doff<<2,
1da177e4
LT		 890 skb->csum));
891 }
892}
893
a430a43d
HX		 894static int tcp_v6_gso_send_check(struct sk_buff *skb)
895{
896 struct ipv6hdr *ipv6h;
897 struct tcphdr *th;
898
899 if (!pskb_may_pull(skb, sizeof(*th)))
900 return -EINVAL;
901
0660e03f 902 ipv6h = ipv6_hdr(skb);
aa8223c7 903 th = tcp_hdr(skb);
a430a43d
HX		 904
905 th->check = 0;
906 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
907 IPPROTO_TCP, 0);
663ead3b 908 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 909 skb->csum_offset = offsetof(struct tcphdr, check);
84fa7933 910 skb->ip_summed = CHECKSUM_PARTIAL;
a430a43d
HX		 911 return 0;
912}
1da177e4 913
cfb6eeb4 914static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1da177e4 915{
aa8223c7 916 struct tcphdr *th = tcp_hdr(skb), *t1;
1da177e4
LT		 917 struct sk_buff *buff;
918 struct flowi fl;
c346dca1 919 struct net *net = dev_net(skb->dst->dev);
e5047992 920 struct sock *ctl_sk = net->ipv6.tcp_sk;
9cb5734e 921 unsigned int tot_len = sizeof(*th);
cfb6eeb4
YH		 922#ifdef CONFIG_TCP_MD5SIG
923 struct tcp_md5sig_key *key;
924#endif
1da177e4
LT		 925
926 if (th->rst)
927 return;
928
929 if (!ipv6_unicast_destination(skb))
1ab1457c 930 return;
1da177e4 931
cfb6eeb4
YH		 932#ifdef CONFIG_TCP_MD5SIG
933 if (sk)
0660e03f 934 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
cfb6eeb4
YH		 935 else
936 key = NULL;
937
938 if (key)
939 tot_len += TCPOLEN_MD5SIG_ALIGNED;
940#endif
941
1da177e4
LT		 942 /*
943 * We need to grab some memory, and put together an RST,
944 * and then put it into the queue to be sent.
945 */
946
cfb6eeb4 947 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1da177e4 948 GFP_ATOMIC);
1ab1457c
YH		 949 if (buff == NULL)
950 return;
1da177e4 951
cfb6eeb4 952 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1da177e4 953
cfb6eeb4 954 t1 = (struct tcphdr *) skb_push(buff, tot_len);
1da177e4
LT		 955
956 /* Swap the send and the receive. */
957 memset(t1, 0, sizeof(*t1));
958 t1->dest = th->source;
959 t1->source = th->dest;
cfb6eeb4 960 t1->doff = tot_len / 4;
1da177e4 961 t1->rst = 1;
1ab1457c 962
1da177e4 963 if(th->ack) {
1ab1457c 964 t1->seq = th->ack_seq;
1da177e4
LT		 965 } else {
966 t1->ack = 1;
967 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
968 + skb->len - (th->doff<<2));
969 }
970
cfb6eeb4
YH		 971#ifdef CONFIG_TCP_MD5SIG
972 if (key) {
8e5200f5 973 __be32 *opt = (__be32*)(t1 + 1);
cfb6eeb4
YH		 974 opt[0] = htonl((TCPOPT_NOP << 24) |
975 (TCPOPT_NOP << 16) |
976 (TCPOPT_MD5SIG << 8) |
977 TCPOLEN_MD5SIG);
0660e03f
ACM		 978 tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
979 &ipv6_hdr(skb)->daddr,
980 &ipv6_hdr(skb)->saddr,
076fb722 981 t1, tot_len);
cfb6eeb4
YH		 982 }
983#endif
984
1da177e4
LT		 985 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
986
987 memset(&fl, 0, sizeof(fl));
0660e03f
ACM		 988 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
989 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 990
991 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
992 sizeof(*t1), IPPROTO_TCP,
993 buff->csum);
994
995 fl.proto = IPPROTO_TCP;
505cbfc5 996 fl.oif = inet6_iif(skb);
1da177e4
LT		 997 fl.fl_ip_dport = t1->dest;
998 fl.fl_ip_sport = t1->source;
beb8d13b 999 security_skb_classify_flow(skb, &fl);
1da177e4 1000
c20121ae
DL		 1001 /* Pass a socket to ip6_dst_lookup either it is for RST
1002 * Underlying function will use this to retrieve the network
1003 * namespace
1004 */
e5047992 1005 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1da177e4 1006
ecc51b6d 1007 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
e5047992 1008 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
ecc51b6d
ACM		 1009 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1010 TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
1da177e4 1011 return;
ecc51b6d 1012 }
1da177e4
LT		 1013 }
1014
1015 kfree_skb(buff);
1016}
1017
9501f972
YH		 1018static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1019 struct tcp_md5sig_key *key)
1da177e4 1020{
aa8223c7 1021 struct tcphdr *th = tcp_hdr(skb), *t1;
1da177e4
LT		 1022 struct sk_buff *buff;
1023 struct flowi fl;
c346dca1 1024 struct net *net = dev_net(skb->dev);
e5047992 1025 struct sock *ctl_sk = net->ipv6.tcp_sk;
9cb5734e 1026 unsigned int tot_len = sizeof(struct tcphdr);
e69a4adc 1027 __be32 *topt;
1da177e4
LT		 1028
1029 if (ts)
4244f8a9 1030 tot_len += TCPOLEN_TSTAMP_ALIGNED;
cfb6eeb4
YH		 1031#ifdef CONFIG_TCP_MD5SIG
1032 if (key)
1033 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1034#endif
1da177e4
LT		 1035
1036 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1037 GFP_ATOMIC);
1038 if (buff == NULL)
1039 return;
1040
1041 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1042
1043 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1044
1045 /* Swap the send and the receive. */
1046 memset(t1, 0, sizeof(*t1));
1047 t1->dest = th->source;
1048 t1->source = th->dest;
1049 t1->doff = tot_len/4;
1050 t1->seq = htonl(seq);
1051 t1->ack_seq = htonl(ack);
1052 t1->ack = 1;
1053 t1->window = htons(win);
cfb6eeb4 1054
e69a4adc 1055 topt = (__be32 *)(t1 + 1);
1ab1457c 1056
1da177e4 1057 if (ts) {
cfb6eeb4
YH		 1058 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1059 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1060 *topt++ = htonl(tcp_time_stamp);
1061 *topt = htonl(ts);
1da177e4
LT		 1062 }
1063
cfb6eeb4
YH		 1064#ifdef CONFIG_TCP_MD5SIG
1065 if (key) {
1066 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1067 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
0660e03f
ACM		 1068 tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
1069 &ipv6_hdr(skb)->daddr,
1070 &ipv6_hdr(skb)->saddr,
076fb722 1071 t1, tot_len);
cfb6eeb4
YH		 1072 }
1073#endif
1074
1da177e4
LT		 1075 buff->csum = csum_partial((char *)t1, tot_len, 0);
1076
1077 memset(&fl, 0, sizeof(fl));
0660e03f
ACM		 1078 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1079 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1080
1081 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1082 tot_len, IPPROTO_TCP,
1083 buff->csum);
1084
1085 fl.proto = IPPROTO_TCP;
505cbfc5 1086 fl.oif = inet6_iif(skb);
1da177e4
LT		 1087 fl.fl_ip_dport = t1->dest;
1088 fl.fl_ip_sport = t1->source;
beb8d13b 1089 security_skb_classify_flow(skb, &fl);
1da177e4 1090
e5047992 1091 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
ecc51b6d 1092 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
e5047992 1093 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
ecc51b6d 1094 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1da177e4 1095 return;
ecc51b6d 1096 }
1da177e4
LT		 1097 }
1098
1099 kfree_skb(buff);
1100}
1101
1102static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1103{
8feaf0c0 1104 struct inet_timewait_sock *tw = inet_twsk(sk);
cfb6eeb4 1105 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1da177e4 1106
9501f972 1107 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
8feaf0c0 1108 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
9501f972 1109 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
1da177e4 1110
8feaf0c0 1111 inet_twsk_put(tw);
1da177e4
LT		 1112}
1113
60236fdd 1114static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
1da177e4 1115{
9501f972
YH		 1116 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1117 tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr));
1da177e4
LT		 1118}
1119
1120
1121static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1122{
60236fdd 1123 struct request_sock *req, **prev;
aa8223c7 1124 const struct tcphdr *th = tcp_hdr(skb);
1da177e4
LT		 1125 struct sock *nsk;
1126
1127 /* Find possible connection requests. */
8129765a 1128 req = inet6_csk_search_req(sk, &prev, th->source,
0660e03f
ACM		 1129 &ipv6_hdr(skb)->saddr,
1130 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1da177e4
LT		 1131 if (req)
1132 return tcp_check_req(sk, skb, req, prev);
1133
3b1e0a65 1134 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
d86e0dac
PE		 1135 &ipv6_hdr(skb)->saddr, th->source,
1136 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1da177e4
LT		 1137
1138 if (nsk) {
1139 if (nsk->sk_state != TCP_TIME_WAIT) {
1140 bh_lock_sock(nsk);
1141 return nsk;
1142 }
9469c7b4 1143 inet_twsk_put(inet_twsk(nsk));
1da177e4
LT		 1144 return NULL;
1145 }
1146
c6aefafb 1147#ifdef CONFIG_SYN_COOKIES
1da177e4 1148 if (!th->rst && !th->syn && th->ack)
c6aefafb 1149 sk = cookie_v6_check(sk, skb);
1da177e4
LT		 1150#endif
1151 return sk;
1152}
1153
1da177e4
LT		 1154/* FIXME: this is substantially similar to the ipv4 code.
1155 * Can some kind of merge be done? -- erics
1156 */
1157static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1158{
ca304b61 1159 struct inet6_request_sock *treq;
1da177e4
LT		 1160 struct ipv6_pinfo *np = inet6_sk(sk);
1161 struct tcp_options_received tmp_opt;
1162 struct tcp_sock *tp = tcp_sk(sk);
60236fdd 1163 struct request_sock *req = NULL;
1da177e4 1164 __u32 isn = TCP_SKB_CB(skb)->when;
c6aefafb
GG		 1165#ifdef CONFIG_SYN_COOKIES
1166 int want_cookie = 0;
1167#else
1168#define want_cookie 0
1169#endif
1da177e4
LT		 1170
1171 if (skb->protocol == htons(ETH_P_IP))
1172 return tcp_v4_conn_request(sk, skb);
1173
1174 if (!ipv6_unicast_destination(skb))
1ab1457c 1175 goto drop;
1da177e4 1176
463c84b9 1177 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1da177e4 1178 if (net_ratelimit())
c6aefafb
GG		 1179 syn_flood_warning(skb);
1180#ifdef CONFIG_SYN_COOKIES
1181 if (sysctl_tcp_syncookies)
1182 want_cookie = 1;
1183 else
1184#endif
1ab1457c 1185 goto drop;
1da177e4
LT		 1186 }
1187
463c84b9 1188 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1da177e4
LT		 1189 goto drop;
1190
ca304b61 1191 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1da177e4
LT		 1192 if (req == NULL)
1193 goto drop;
1194
cfb6eeb4
YH		 1195#ifdef CONFIG_TCP_MD5SIG
1196 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1197#endif
1198
1da177e4
LT		 1199 tcp_clear_options(&tmp_opt);
1200 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1201 tmp_opt.user_mss = tp->rx_opt.user_mss;
1202
1203 tcp_parse_options(skb, &tmp_opt, 0);
1204
4dfc2817 1205 if (want_cookie && !tmp_opt.saw_tstamp)
c6aefafb 1206 tcp_clear_options(&tmp_opt);
c6aefafb 1207
1da177e4
LT		 1208 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1209 tcp_openreq_init(req, &tmp_opt, skb);
1210
ca304b61 1211 treq = inet6_rsk(req);
0660e03f
ACM		 1212 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1213 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
2e6599cb 1214 treq->pktopts = NULL;
c6aefafb
GG		 1215 if (!want_cookie)
1216 TCP_ECN_create_request(req, tcp_hdr(skb));
1217
1218 if (want_cookie) {
1219 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
4dfc2817 1220 req->cookie_ts = tmp_opt.tstamp_ok;
c6aefafb
GG		 1221 } else if (!isn) {
1222 if (ipv6_opt_accepted(sk, skb) ||
1223 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1224 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1225 atomic_inc(&skb->users);
1226 treq->pktopts = skb;
1227 }
1228 treq->iif = sk->sk_bound_dev_if;
1da177e4 1229
c6aefafb
GG		 1230 /* So that link locals have meaning */
1231 if (!sk->sk_bound_dev_if &&
1232 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1233 treq->iif = inet6_iif(skb);
1da177e4 1234
a94f723d 1235 isn = tcp_v6_init_sequence(skb);
c6aefafb 1236 }
1da177e4 1237
2e6599cb 1238 tcp_rsk(req)->snt_isn = isn;
1da177e4 1239
4237c75c
VY		 1240 security_inet_conn_request(sk, skb, req);
1241
fd80eb94 1242 if (tcp_v6_send_synack(sk, req))
1da177e4
LT		 1243 goto drop;
1244
c6aefafb
GG		 1245 if (!want_cookie) {
1246 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1247 return 0;
1248 }
1da177e4
LT		 1249
1250drop:
1251 if (req)
60236fdd 1252 reqsk_free(req);
1da177e4 1253
1da177e4
LT		 1254 return 0; /* don't send reset */
1255}
1256
1257static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
60236fdd 1258 struct request_sock *req,
1da177e4
LT		 1259 struct dst_entry *dst)
1260{
ca304b61 1261 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 1262 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1263 struct tcp6_sock *newtcp6sk;
1264 struct inet_sock *newinet;
1265 struct tcp_sock *newtp;
1266 struct sock *newsk;
1267 struct ipv6_txoptions *opt;
cfb6eeb4
YH		 1268#ifdef CONFIG_TCP_MD5SIG
1269 struct tcp_md5sig_key *key;
1270#endif
1da177e4
LT		 1271
1272 if (skb->protocol == htons(ETH_P_IP)) {
1273 /*
1274 * v6 mapped
1275 */
1276
1277 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1278
1ab1457c 1279 if (newsk == NULL)
1da177e4
LT		 1280 return NULL;
1281
1282 newtcp6sk = (struct tcp6_sock *)newsk;
1283 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1284
1285 newinet = inet_sk(newsk);
1286 newnp = inet6_sk(newsk);
1287 newtp = tcp_sk(newsk);
1288
1289 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1290
1291 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1292 newinet->daddr);
1293
1294 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1295 newinet->saddr);
1296
1297 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1298
8292a17a 1299 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1da177e4 1300 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 1301#ifdef CONFIG_TCP_MD5SIG
1302 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1303#endif
1304
1da177e4
LT		 1305 newnp->pktoptions = NULL;
1306 newnp->opt = NULL;
505cbfc5 1307 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1308 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4 1309
e6848976
ACM		 1310 /*
1311 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1312 * here, tcp_create_openreq_child now does this for us, see the comment in
1313 * that function for the gory details. -acme
1da177e4 1314 */
1da177e4
LT		 1315
1316 /* It is tricky place. Until this moment IPv4 tcp
8292a17a 1317 worked with IPv6 icsk.icsk_af_ops.
1da177e4
LT		 1318 Sync it now.
1319 */
d83d8461 1320 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1da177e4
LT		 1321
1322 return newsk;
1323 }
1324
1325 opt = np->opt;
1326
1327 if (sk_acceptq_is_full(sk))
1328 goto out_overflow;
1329
1da177e4
LT		 1330 if (dst == NULL) {
1331 struct in6_addr *final_p = NULL, final;
1332 struct flowi fl;
1333
1334 memset(&fl, 0, sizeof(fl));
1335 fl.proto = IPPROTO_TCP;
2e6599cb 1336 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1da177e4
LT		 1337 if (opt && opt->srcrt) {
1338 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1339 ipv6_addr_copy(&final, &fl.fl6_dst);
1340 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1341 final_p = &final;
1342 }
2e6599cb 1343 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1da177e4 1344 fl.oif = sk->sk_bound_dev_if;
2e6599cb 1345 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1da177e4 1346 fl.fl_ip_sport = inet_sk(sk)->sport;
4237c75c 1347 security_req_classify_flow(req, &fl);
1da177e4
LT		 1348
1349 if (ip6_dst_lookup(sk, &dst, &fl))
1350 goto out;
1351
1352 if (final_p)
1353 ipv6_addr_copy(&fl.fl6_dst, final_p);
1354
1355 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1356 goto out;
1ab1457c 1357 }
1da177e4
LT		 1358
1359 newsk = tcp_create_openreq_child(sk, req, skb);
1360 if (newsk == NULL)
1361 goto out;
1362
e6848976
ACM		 1363 /*
1364 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1365 * count here, tcp_create_openreq_child now does this for us, see the
1366 * comment in that function for the gory details. -acme
1367 */
1da177e4 1368
59eed279 1369 newsk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 1370 __ip6_dst_store(newsk, dst, NULL, NULL);
1da177e4
LT		 1371
1372 newtcp6sk = (struct tcp6_sock *)newsk;
1373 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1374
1375 newtp = tcp_sk(newsk);
1376 newinet = inet_sk(newsk);
1377 newnp = inet6_sk(newsk);
1378
1379 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1380
2e6599cb
ACM		 1381 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1382 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1383 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1384 newsk->sk_bound_dev_if = treq->iif;
1da177e4 1385
1ab1457c 1386 /* Now IPv6 options...
1da177e4
LT		 1387
1388 First: no IPv4 options.
1389 */
1390 newinet->opt = NULL;
d35690be 1391 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1392
1393 /* Clone RX bits */
1394 newnp->rxopt.all = np->rxopt.all;
1395
1396 /* Clone pktoptions received with SYN */
1397 newnp->pktoptions = NULL;
2e6599cb
ACM		 1398 if (treq->pktopts != NULL) {
1399 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1400 kfree_skb(treq->pktopts);
1401 treq->pktopts = NULL;
1da177e4
LT		 1402 if (newnp->pktoptions)
1403 skb_set_owner_r(newnp->pktoptions, newsk);
1404 }
1405 newnp->opt = NULL;
505cbfc5 1406 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1407 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4
LT		 1408
1409 /* Clone native IPv6 options from listening socket (if any)
1410
1411 Yes, keeping reference count would be much more clever,
1412 but we make one more one thing there: reattach optmem
1413 to newsk.
1414 */
1415 if (opt) {
1416 newnp->opt = ipv6_dup_options(newsk, opt);
1417 if (opt != np->opt)
1418 sock_kfree_s(sk, opt, opt->tot_len);
1419 }
1420
d83d8461 1421 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1da177e4 1422 if (newnp->opt)
d83d8461
ACM		 1423 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1424 newnp->opt->opt_flen);
1da177e4 1425
5d424d5a 1426 tcp_mtup_init(newsk);
1da177e4
LT		 1427 tcp_sync_mss(newsk, dst_mtu(dst));
1428 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1429 tcp_initialize_rcv_mss(newsk);
1430
1431 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1432
cfb6eeb4
YH		 1433#ifdef CONFIG_TCP_MD5SIG
1434 /* Copy over the MD5 key from the original socket */
1435 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1436 /* We're using one, so create a matching key
1437 * on the newsk structure. If we fail to get
1438 * memory, then we end up not copying the key
1439 * across. Shucks.
1440 */
af879cc7
ACM		 1441 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1442 if (newkey != NULL)
cfb6eeb4
YH		 1443 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1444 newkey, key->keylen);
cfb6eeb4
YH		 1445 }
1446#endif
1447
ab1e0a13 1448 __inet6_hash(newsk);
e56d8b8a 1449 __inet_inherit_port(sk, newsk);
1da177e4
LT		 1450
1451 return newsk;
1452
1453out_overflow:
1454 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
1455out:
1456 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
1457 if (opt && opt != np->opt)
1458 sock_kfree_s(sk, opt, opt->tot_len);
1459 dst_release(dst);
1460 return NULL;
1461}
1462
b51655b9 1463static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1da177e4 1464{
84fa7933 1465 if (skb->ip_summed == CHECKSUM_COMPLETE) {
aa8223c7 1466 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
0660e03f 1467 &ipv6_hdr(skb)->daddr, skb->csum)) {
fb286bb2 1468 skb->ip_summed = CHECKSUM_UNNECESSARY;
1da177e4 1469 return 0;
fb286bb2 1470 }
1da177e4 1471 }
fb286bb2 1472
aa8223c7 1473 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
0660e03f
ACM		 1474 &ipv6_hdr(skb)->saddr,
1475 &ipv6_hdr(skb)->daddr, 0));
fb286bb2 1476
1da177e4 1477 if (skb->len <= 76) {
fb286bb2 1478 return __skb_checksum_complete(skb);
1da177e4
LT		 1479 }
1480 return 0;
1481}
1482
1483/* The socket must have it's spinlock held when we get
1484 * here.
1485 *
1486 * We have a potential double-lock case here, so even when
1487 * doing backlog processing we use the BH locking scheme.
1488 * This is because we cannot sleep with the original spinlock
1489 * held.
1490 */
1491static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1492{
1493 struct ipv6_pinfo *np = inet6_sk(sk);
1494 struct tcp_sock *tp;
1495 struct sk_buff *opt_skb = NULL;
1496
1497 /* Imagine: socket is IPv6. IPv4 packet arrives,
1498 goes to IPv4 receive handler and backlogged.
1499 From backlog it always goes here. Kerboom...
1500 Fortunately, tcp_rcv_established and rcv_established
1501 handle them correctly, but it is not case with
1502 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1503 */
1504
1505 if (skb->protocol == htons(ETH_P_IP))
1506 return tcp_v4_do_rcv(sk, skb);
1507
cfb6eeb4
YH		 1508#ifdef CONFIG_TCP_MD5SIG
1509 if (tcp_v6_inbound_md5_hash (sk, skb))
1510 goto discard;
1511#endif
1512
fda9ef5d 1513 if (sk_filter(sk, skb))
1da177e4
LT		 1514 goto discard;
1515
1516 /*
1517 * socket locking is here for SMP purposes as backlog rcv
1518 * is currently called with bh processing disabled.
1519 */
1520
1521 /* Do Stevens' IPV6_PKTOPTIONS.
1522
1523 Yes, guys, it is the only place in our code, where we
1524 may make it not affecting IPv4.
1525 The rest of code is protocol independent,
1526 and I do not like idea to uglify IPv4.
1527
1528 Actually, all the idea behind IPV6_PKTOPTIONS
1529 looks not very well thought. For now we latch
1530 options, received in the last packet, enqueued
1531 by tcp. Feel free to propose better solution.
1ab1457c 1532 --ANK (980728)
1da177e4
LT		 1533 */
1534 if (np->rxopt.all)
1535 opt_skb = skb_clone(skb, GFP_ATOMIC);
1536
1537 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1538 TCP_CHECK_TIMER(sk);
aa8223c7 1539 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1da177e4
LT		 1540 goto reset;
1541 TCP_CHECK_TIMER(sk);
1542 if (opt_skb)
1543 goto ipv6_pktoptions;
1544 return 0;
1545 }
1546
ab6a5bb6 1547 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1da177e4
LT		 1548 goto csum_err;
1549
1ab1457c 1550 if (sk->sk_state == TCP_LISTEN) {
1da177e4
LT		 1551 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1552 if (!nsk)
1553 goto discard;
1554
1555 /*
1556 * Queue it on the new socket if the new socket is active,
1557 * otherwise we just shortcircuit this and continue with
1558 * the new socket..
1559 */
1ab1457c 1560 if(nsk != sk) {
1da177e4
LT		 1561 if (tcp_child_process(sk, nsk, skb))
1562 goto reset;
1563 if (opt_skb)
1564 __kfree_skb(opt_skb);
1565 return 0;
1566 }
1567 }
1568
1569 TCP_CHECK_TIMER(sk);
aa8223c7 1570 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1da177e4
LT		 1571 goto reset;
1572 TCP_CHECK_TIMER(sk);
1573 if (opt_skb)
1574 goto ipv6_pktoptions;
1575 return 0;
1576
1577reset:
cfb6eeb4 1578 tcp_v6_send_reset(sk, skb);
1da177e4
LT		 1579discard:
1580 if (opt_skb)
1581 __kfree_skb(opt_skb);
1582 kfree_skb(skb);
1583 return 0;
1584csum_err:
1585 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1586 goto discard;
1587
1588
1589ipv6_pktoptions:
1590 /* Do you ask, what is it?
1591
1592 1. skb was enqueued by tcp.
1593 2. skb is added to tail of read queue, rather than out of order.
1594 3. socket is not in passive state.
1595 4. Finally, it really contains options, which user wants to receive.
1596 */
1597 tp = tcp_sk(sk);
1598 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1599 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
333fad53 1600 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
505cbfc5 1601 np->mcast_oif = inet6_iif(opt_skb);
333fad53 1602 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
0660e03f 1603 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1da177e4
LT		 1604 if (ipv6_opt_accepted(sk, opt_skb)) {
1605 skb_set_owner_r(opt_skb, sk);
1606 opt_skb = xchg(&np->pktoptions, opt_skb);
1607 } else {
1608 __kfree_skb(opt_skb);
1609 opt_skb = xchg(&np->pktoptions, NULL);
1610 }
1611 }
1612
1613 if (opt_skb)
1614 kfree_skb(opt_skb);
1615 return 0;
1616}
1617
e5bbef20 1618static int tcp_v6_rcv(struct sk_buff *skb)
1da177e4 1619{
1ab1457c 1620 struct tcphdr *th;
1da177e4
LT		 1621 struct sock *sk;
1622 int ret;
1623
1624 if (skb->pkt_type != PACKET_HOST)
1625 goto discard_it;
1626
1627 /*
1628 * Count it even if it's bad.
1629 */
1630 TCP_INC_STATS_BH(TCP_MIB_INSEGS);
1631
1632 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1633 goto discard_it;
1634
aa8223c7 1635 th = tcp_hdr(skb);
1da177e4
LT		 1636
1637 if (th->doff < sizeof(struct tcphdr)/4)
1638 goto bad_packet;
1639 if (!pskb_may_pull(skb, th->doff*4))
1640 goto discard_it;
1641
60476372 1642 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1da177e4
LT		 1643 goto bad_packet;
1644
aa8223c7 1645 th = tcp_hdr(skb);
1da177e4
LT		 1646 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1647 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1648 skb->len - th->doff*4);
1649 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1650 TCP_SKB_CB(skb)->when = 0;
0660e03f 1651 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1da177e4
LT		 1652 TCP_SKB_CB(skb)->sacked = 0;
1653
c346dca1 1654 sk = __inet6_lookup(dev_net(skb->dev), &tcp_hashinfo,
d86e0dac
PE		 1655 &ipv6_hdr(skb)->saddr, th->source,
1656 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1657 inet6_iif(skb));
1da177e4
LT		 1658
1659 if (!sk)
1660 goto no_tcp_socket;
1661
1662process:
1663 if (sk->sk_state == TCP_TIME_WAIT)
1664 goto do_time_wait;
1665
1666 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1667 goto discard_and_relse;
1668
fda9ef5d 1669 if (sk_filter(sk, skb))
1da177e4
LT		 1670 goto discard_and_relse;
1671
1672 skb->dev = NULL;
1673
293b9c42 1674 bh_lock_sock_nested(sk);
1da177e4
LT		 1675 ret = 0;
1676 if (!sock_owned_by_user(sk)) {
1a2449a8 1677#ifdef CONFIG_NET_DMA
1ab1457c 1678 struct tcp_sock *tp = tcp_sk(sk);
b4caea8a
DM		 1679 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1680 tp->ucopy.dma_chan = get_softnet_dma();
1ab1457c
YH		 1681 if (tp->ucopy.dma_chan)
1682 ret = tcp_v6_do_rcv(sk, skb);
1683 else
1a2449a8
CL		 1684#endif
1685 {
1686 if (!tcp_prequeue(sk, skb))
1687 ret = tcp_v6_do_rcv(sk, skb);
1688 }
1da177e4
LT		 1689 } else
1690 sk_add_backlog(sk, skb);
1691 bh_unlock_sock(sk);
1692
1693 sock_put(sk);
1694 return ret ? -1 : 0;
1695
1696no_tcp_socket:
1697 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1698 goto discard_it;
1699
1700 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1701bad_packet:
1702 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1703 } else {
cfb6eeb4 1704 tcp_v6_send_reset(NULL, skb);
1da177e4
LT		 1705 }
1706
1707discard_it:
1708
1709 /*
1710 * Discard frame
1711 */
1712
1713 kfree_skb(skb);
1714 return 0;
1715
1716discard_and_relse:
1717 sock_put(sk);
1718 goto discard_it;
1719
1720do_time_wait:
1721 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
9469c7b4 1722 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1723 goto discard_it;
1724 }
1725
1726 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1727 TCP_INC_STATS_BH(TCP_MIB_INERRS);
9469c7b4 1728 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1729 goto discard_it;
1730 }
1731
9469c7b4 1732 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1da177e4
LT		 1733 case TCP_TW_SYN:
1734 {
1735 struct sock *sk2;
1736
c346dca1 1737 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
0660e03f 1738 &ipv6_hdr(skb)->daddr,
505cbfc5 1739 ntohs(th->dest), inet6_iif(skb));
1da177e4 1740 if (sk2 != NULL) {
295ff7ed
ACM		 1741 struct inet_timewait_sock *tw = inet_twsk(sk);
1742 inet_twsk_deschedule(tw, &tcp_death_row);
1743 inet_twsk_put(tw);
1da177e4
LT		 1744 sk = sk2;
1745 goto process;
1746 }
1747 /* Fall through to ACK */
1748 }
1749 case TCP_TW_ACK:
1750 tcp_v6_timewait_ack(sk, skb);
1751 break;
1752 case TCP_TW_RST:
1753 goto no_tcp_socket;
1754 case TCP_TW_SUCCESS:;
1755 }
1756 goto discard_it;
1757}
1758
1da177e4
LT		 1759static int tcp_v6_remember_stamp(struct sock *sk)
1760{
1761 /* Alas, not yet... */
1762 return 0;
1763}
1764
8292a17a 1765static struct inet_connection_sock_af_ops ipv6_specific = {
543d9cfe
ACM		 1766 .queue_xmit = inet6_csk_xmit,
1767 .send_check = tcp_v6_send_check,
1768 .rebuild_header = inet6_sk_rebuild_header,
1769 .conn_request = tcp_v6_conn_request,
1770 .syn_recv_sock = tcp_v6_syn_recv_sock,
1771 .remember_stamp = tcp_v6_remember_stamp,
1772 .net_header_len = sizeof(struct ipv6hdr),
1773 .setsockopt = ipv6_setsockopt,
1774 .getsockopt = ipv6_getsockopt,
1775 .addr2sockaddr = inet6_csk_addr2sockaddr,
1776 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1777 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1778#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1779 .compat_setsockopt = compat_ipv6_setsockopt,
1780 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1781#endif
1da177e4
LT		 1782};
1783
cfb6eeb4 1784#ifdef CONFIG_TCP_MD5SIG
a928630a 1785static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
cfb6eeb4
YH		 1786 .md5_lookup = tcp_v6_md5_lookup,
1787 .calc_md5_hash = tcp_v6_calc_md5_hash,
1788 .md5_add = tcp_v6_md5_add_func,
1789 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1790};
a928630a 1791#endif
cfb6eeb4 1792
1da177e4
LT		 1793/*
1794 * TCP over IPv4 via INET6 API
1795 */
1796
8292a17a 1797static struct inet_connection_sock_af_ops ipv6_mapped = {
543d9cfe
ACM		 1798 .queue_xmit = ip_queue_xmit,
1799 .send_check = tcp_v4_send_check,
1800 .rebuild_header = inet_sk_rebuild_header,
1801 .conn_request = tcp_v6_conn_request,
1802 .syn_recv_sock = tcp_v6_syn_recv_sock,
1803 .remember_stamp = tcp_v4_remember_stamp,
1804 .net_header_len = sizeof(struct iphdr),
1805 .setsockopt = ipv6_setsockopt,
1806 .getsockopt = ipv6_getsockopt,
1807 .addr2sockaddr = inet6_csk_addr2sockaddr,
1808 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1809 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1810#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1811 .compat_setsockopt = compat_ipv6_setsockopt,
1812 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1813#endif
1da177e4
LT		 1814};
1815
cfb6eeb4 1816#ifdef CONFIG_TCP_MD5SIG
a928630a 1817static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
cfb6eeb4
YH		 1818 .md5_lookup = tcp_v4_md5_lookup,
1819 .calc_md5_hash = tcp_v4_calc_md5_hash,
1820 .md5_add = tcp_v6_md5_add_func,
1821 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1822};
a928630a 1823#endif
cfb6eeb4 1824
1da177e4
LT		 1825/* NOTE: A lot of things set to zero explicitly by call to
1826 * sk_alloc() so need not be done here.
1827 */
1828static int tcp_v6_init_sock(struct sock *sk)
1829{
6687e988 1830 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 1831 struct tcp_sock *tp = tcp_sk(sk);
1832
1833 skb_queue_head_init(&tp->out_of_order_queue);
1834 tcp_init_xmit_timers(sk);
1835 tcp_prequeue_init(tp);
1836
6687e988 1837 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1da177e4
LT		 1838 tp->mdev = TCP_TIMEOUT_INIT;
1839
1840 /* So many TCP implementations out there (incorrectly) count the
1841 * initial SYN frame in their delayed-ACK and congestion control
1842 * algorithms that we must have the following bandaid to talk
1843 * efficiently to them. -DaveM
1844 */
1845 tp->snd_cwnd = 2;
1846
1847 /* See draft-stevens-tcpca-spec-01 for discussion of the
1848 * initialization of these values.
1849 */
1850 tp->snd_ssthresh = 0x7fffffff;
1851 tp->snd_cwnd_clamp = ~0;
c1b4a7e6 1852 tp->mss_cache = 536;
1da177e4
LT		 1853
1854 tp->reordering = sysctl_tcp_reordering;
1855
1856 sk->sk_state = TCP_CLOSE;
1857
8292a17a 1858 icsk->icsk_af_ops = &ipv6_specific;
6687e988 1859 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
d83d8461 1860 icsk->icsk_sync_mss = tcp_sync_mss;
1da177e4
LT		 1861 sk->sk_write_space = sk_stream_write_space;
1862 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1863
cfb6eeb4
YH		 1864#ifdef CONFIG_TCP_MD5SIG
1865 tp->af_specific = &tcp_sock_ipv6_specific;
1866#endif
1867
1da177e4
LT		 1868 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1869 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1870
1871 atomic_inc(&tcp_sockets_allocated);
1872
1873 return 0;
1874}
1875
1876static int tcp_v6_destroy_sock(struct sock *sk)
1877{
cfb6eeb4
YH		 1878#ifdef CONFIG_TCP_MD5SIG
1879 /* Clean up the MD5 key list */
1880 if (tcp_sk(sk)->md5sig_info)
1881 tcp_v6_clear_md5_list(sk);
1882#endif
1da177e4
LT		 1883 tcp_v4_destroy_sock(sk);
1884 return inet6_destroy_sock(sk);
1885}
1886
952a10be 1887#ifdef CONFIG_PROC_FS
1da177e4 1888/* Proc filesystem TCPv6 sock list dumping. */
1ab1457c 1889static void get_openreq6(struct seq_file *seq,
60236fdd 1890 struct sock *sk, struct request_sock *req, int i, int uid)
1da177e4 1891{
1da177e4 1892 int ttd = req->expires - jiffies;
ca304b61
ACM		 1893 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1894 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1da177e4
LT		 1895
1896 if (ttd < 0)
1897 ttd = 0;
1898
1da177e4
LT		 1899 seq_printf(seq,
1900 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1901 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1902 i,
1903 src->s6_addr32[0], src->s6_addr32[1],
1904 src->s6_addr32[2], src->s6_addr32[3],
1905 ntohs(inet_sk(sk)->sport),
1906 dest->s6_addr32[0], dest->s6_addr32[1],
1907 dest->s6_addr32[2], dest->s6_addr32[3],
2e6599cb 1908 ntohs(inet_rsk(req)->rmt_port),
1da177e4
LT		 1909 TCP_SYN_RECV,
1910 0,0, /* could print option size, but that is af dependent. */
1ab1457c
YH		 1911 1, /* timers active (only the expire timer) */
1912 jiffies_to_clock_t(ttd),
1da177e4
LT		 1913 req->retrans,
1914 uid,
1ab1457c 1915 0, /* non standard timer */
1da177e4
LT		 1916 0, /* open_requests have no inode */
1917 0, req);
1918}
1919
1920static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1921{
1922 struct in6_addr *dest, *src;
1923 __u16 destp, srcp;
1924 int timer_active;
1925 unsigned long timer_expires;
1926 struct inet_sock *inet = inet_sk(sp);
1927 struct tcp_sock *tp = tcp_sk(sp);
463c84b9 1928 const struct inet_connection_sock *icsk = inet_csk(sp);
1da177e4
LT		 1929 struct ipv6_pinfo *np = inet6_sk(sp);
1930
1931 dest = &np->daddr;
1932 src = &np->rcv_saddr;
1933 destp = ntohs(inet->dport);
1934 srcp = ntohs(inet->sport);
463c84b9
ACM		 1935
1936 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1da177e4 1937 timer_active = 1;
463c84b9
ACM		 1938 timer_expires = icsk->icsk_timeout;
1939 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1da177e4 1940 timer_active = 4;
463c84b9 1941 timer_expires = icsk->icsk_timeout;
1da177e4
LT		 1942 } else if (timer_pending(&sp->sk_timer)) {
1943 timer_active = 2;
1944 timer_expires = sp->sk_timer.expires;
1945 } else {
1946 timer_active = 0;
1947 timer_expires = jiffies;
1948 }
1949
1950 seq_printf(seq,
1951 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1952 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
1953 i,
1954 src->s6_addr32[0], src->s6_addr32[1],
1955 src->s6_addr32[2], src->s6_addr32[3], srcp,
1956 dest->s6_addr32[0], dest->s6_addr32[1],
1957 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1ab1457c 1958 sp->sk_state,
47da8ee6
SS		 1959 tp->write_seq-tp->snd_una,
1960 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1da177e4
LT		 1961 timer_active,
1962 jiffies_to_clock_t(timer_expires - jiffies),
463c84b9 1963 icsk->icsk_retransmits,
1da177e4 1964 sock_i_uid(sp),
6687e988 1965 icsk->icsk_probes_out,
1da177e4
LT		 1966 sock_i_ino(sp),
1967 atomic_read(&sp->sk_refcnt), sp,
463c84b9
ACM		 1968 icsk->icsk_rto,
1969 icsk->icsk_ack.ato,
1970 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
1da177e4
LT		 1971 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
1972 );
1973}
1974
1ab1457c 1975static void get_timewait6_sock(struct seq_file *seq,
8feaf0c0 1976 struct inet_timewait_sock *tw, int i)
1da177e4
LT		 1977{
1978 struct in6_addr *dest, *src;
1979 __u16 destp, srcp;
0fa1a53e 1980 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1da177e4
LT		 1981 int ttd = tw->tw_ttd - jiffies;
1982
1983 if (ttd < 0)
1984 ttd = 0;
1985
0fa1a53e
ACM		 1986 dest = &tw6->tw_v6_daddr;
1987 src = &tw6->tw_v6_rcv_saddr;
1da177e4
LT		 1988 destp = ntohs(tw->tw_dport);
1989 srcp = ntohs(tw->tw_sport);
1990
1991 seq_printf(seq,
1992 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1993 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1994 i,
1995 src->s6_addr32[0], src->s6_addr32[1],
1996 src->s6_addr32[2], src->s6_addr32[3], srcp,
1997 dest->s6_addr32[0], dest->s6_addr32[1],
1998 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1999 tw->tw_substate, 0, 0,
2000 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2001 atomic_read(&tw->tw_refcnt), tw);
2002}
2003
1da177e4
LT		 2004static int tcp6_seq_show(struct seq_file *seq, void *v)
2005{
2006 struct tcp_iter_state *st;
2007
2008 if (v == SEQ_START_TOKEN) {
2009 seq_puts(seq,
2010 " sl "
2011 "local_address "
2012 "remote_address "
2013 "st tx_queue rx_queue tr tm->when retrnsmt"
2014 " uid timeout inode\n");
2015 goto out;
2016 }
2017 st = seq->private;
2018
2019 switch (st->state) {
2020 case TCP_SEQ_STATE_LISTENING:
2021 case TCP_SEQ_STATE_ESTABLISHED:
2022 get_tcp6_sock(seq, v, st->num);
2023 break;
2024 case TCP_SEQ_STATE_OPENREQ:
2025 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2026 break;
2027 case TCP_SEQ_STATE_TIME_WAIT:
2028 get_timewait6_sock(seq, v, st->num);
2029 break;
2030 }
2031out:
2032 return 0;
2033}
2034
1da177e4 2035static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1da177e4
LT		 2036 .name = "tcp6",
2037 .family = AF_INET6,
5f4472c5
DL		 2038 .seq_fops = {
2039 .owner = THIS_MODULE,
2040 },
9427c4b3
DL		 2041 .seq_ops = {
2042 .show = tcp6_seq_show,
2043 },
1da177e4
LT		 2044};
2045
6f8b13bc 2046int tcp6_proc_init(struct net *net)
1da177e4 2047{
6f8b13bc 2048 return tcp_proc_register(net, &tcp6_seq_afinfo);
1da177e4
LT		 2049}
2050
6f8b13bc 2051void tcp6_proc_exit(struct net *net)
1da177e4 2052{
6f8b13bc 2053 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1da177e4
LT		 2054}
2055#endif
2056
2057struct proto tcpv6_prot = {
2058 .name = "TCPv6",
2059 .owner = THIS_MODULE,
2060 .close = tcp_close,
2061 .connect = tcp_v6_connect,
2062 .disconnect = tcp_disconnect,
463c84b9 2063 .accept = inet_csk_accept,
1da177e4
LT		 2064 .ioctl = tcp_ioctl,
2065 .init = tcp_v6_init_sock,
2066 .destroy = tcp_v6_destroy_sock,
2067 .shutdown = tcp_shutdown,
2068 .setsockopt = tcp_setsockopt,
2069 .getsockopt = tcp_getsockopt,
1da177e4
LT		 2070 .recvmsg = tcp_recvmsg,
2071 .backlog_rcv = tcp_v6_do_rcv,
2072 .hash = tcp_v6_hash,
ab1e0a13
ACM		 2073 .unhash = inet_unhash,
2074 .get_port = inet_csk_get_port,
1da177e4
LT		 2075 .enter_memory_pressure = tcp_enter_memory_pressure,
2076 .sockets_allocated = &tcp_sockets_allocated,
2077 .memory_allocated = &tcp_memory_allocated,
2078 .memory_pressure = &tcp_memory_pressure,
0a5578cf 2079 .orphan_count = &tcp_orphan_count,
1da177e4
LT		 2080 .sysctl_mem = sysctl_tcp_mem,
2081 .sysctl_wmem = sysctl_tcp_wmem,
2082 .sysctl_rmem = sysctl_tcp_rmem,
2083 .max_header = MAX_TCP_HEADER,
2084 .obj_size = sizeof(struct tcp6_sock),
6d6ee43e 2085 .twsk_prot = &tcp6_timewait_sock_ops,
60236fdd 2086 .rsk_prot = &tcp6_request_sock_ops,
39d8cda7 2087 .h.hashinfo = &tcp_hashinfo,
543d9cfe
ACM		 2088#ifdef CONFIG_COMPAT
2089 .compat_setsockopt = compat_tcp_setsockopt,
2090 .compat_getsockopt = compat_tcp_getsockopt,
2091#endif
1da177e4
LT		 2092};
2093
2094static struct inet6_protocol tcpv6_protocol = {
2095 .handler = tcp_v6_rcv,
2096 .err_handler = tcp_v6_err,
a430a43d 2097 .gso_send_check = tcp_v6_gso_send_check,
adcfc7d0 2098 .gso_segment = tcp_tso_segment,
1da177e4
LT		 2099 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2100};
2101
1da177e4
LT		 2102static struct inet_protosw tcpv6_protosw = {
2103 .type = SOCK_STREAM,
2104 .protocol = IPPROTO_TCP,
2105 .prot = &tcpv6_prot,
2106 .ops = &inet6_stream_ops,
2107 .capability = -1,
2108 .no_check = 0,
d83d8461
ACM		 2109 .flags = INET_PROTOSW_PERMANENT |
2110 INET_PROTOSW_ICSK,
1da177e4
LT		 2111};
2112
93ec926b
DL		 2113static int tcpv6_net_init(struct net *net)
2114{
5677242f
DL		 2115 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2116 SOCK_RAW, IPPROTO_TCP, net);
93ec926b
DL		 2117}
2118
2119static void tcpv6_net_exit(struct net *net)
2120{
5677242f 2121 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
93ec926b
DL		 2122}
2123
2124static struct pernet_operations tcpv6_net_ops = {
2125 .init = tcpv6_net_init,
2126 .exit = tcpv6_net_exit,
2127};
2128
7f4e4868 2129int __init tcpv6_init(void)
1da177e4 2130{
7f4e4868
DL		 2131 int ret;
2132
2133 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2134 if (ret)
2135 goto out;
2136
1da177e4 2137 /* register inet6 protocol */
7f4e4868
DL		 2138 ret = inet6_register_protosw(&tcpv6_protosw);
2139 if (ret)
2140 goto out_tcpv6_protocol;
2141
93ec926b 2142 ret = register_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2143 if (ret)
2144 goto out_tcpv6_protosw;
2145out:
2146 return ret;
ae0f7d5f 2147
7f4e4868
DL		 2148out_tcpv6_protocol:
2149 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2150out_tcpv6_protosw:
2151 inet6_unregister_protosw(&tcpv6_protosw);
2152 goto out;
2153}
2154
09f7709f 2155void tcpv6_exit(void)
7f4e4868 2156{
93ec926b 2157 unregister_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2158 inet6_unregister_protosw(&tcpv6_protosw);
2159 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1da177e4 2160}
Linux kernel - Deliverables
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