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Merge tag 'for-4.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kishon/linux...
[deliverable/linux.git] / net / ipv6 / tcp_ipv6.c
1 /*
2 * TCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on:
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/bottom_half.h>
27 #include <linux/module.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/socket.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/jiffies.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/init.h>
38 #include <linux/jhash.h>
39 #include <linux/ipsec.h>
40 #include <linux/times.h>
41 #include <linux/slab.h>
42 #include <linux/uaccess.h>
43 #include <linux/ipv6.h>
44 #include <linux/icmpv6.h>
45 #include <linux/random.h>
46
47 #include <net/tcp.h>
48 #include <net/ndisc.h>
49 #include <net/inet6_hashtables.h>
50 #include <net/inet6_connection_sock.h>
51 #include <net/ipv6.h>
52 #include <net/transp_v6.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_route.h>
55 #include <net/ip6_checksum.h>
56 #include <net/inet_ecn.h>
57 #include <net/protocol.h>
58 #include <net/xfrm.h>
59 #include <net/snmp.h>
60 #include <net/dsfield.h>
61 #include <net/timewait_sock.h>
62 #include <net/inet_common.h>
63 #include <net/secure_seq.h>
64 #include <net/tcp_memcontrol.h>
65 #include <net/busy_poll.h>
66
67 #include <linux/proc_fs.h>
68 #include <linux/seq_file.h>
69
70 #include <linux/crypto.h>
71 #include <linux/scatterlist.h>
72
73 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
74 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
75 struct request_sock *req);
76
77 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
78
79 static const struct inet_connection_sock_af_ops ipv6_mapped;
80 static const struct inet_connection_sock_af_ops ipv6_specific;
81 #ifdef CONFIG_TCP_MD5SIG
82 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
83 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
84 #else
85 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
86 const struct in6_addr *addr)
87 {
88 return NULL;
89 }
90 #endif
91
92 static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
93 {
94 struct dst_entry *dst = skb_dst(skb);
95
96 if (dst) {
97 const struct rt6_info *rt = (const struct rt6_info *)dst;
98
99 dst_hold(dst);
100 sk->sk_rx_dst = dst;
101 inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
102 if (rt->rt6i_node)
103 inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum;
104 }
105 }
106
107 static void tcp_v6_hash(struct sock *sk)
108 {
109 if (sk->sk_state != TCP_CLOSE) {
110 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
111 tcp_prot.hash(sk);
112 return;
113 }
114 local_bh_disable();
115 __inet6_hash(sk, NULL);
116 local_bh_enable();
117 }
118 }
119
120 static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
121 {
122 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
123 ipv6_hdr(skb)->saddr.s6_addr32,
124 tcp_hdr(skb)->dest,
125 tcp_hdr(skb)->source);
126 }
127
128 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
129 int addr_len)
130 {
131 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
132 struct inet_sock *inet = inet_sk(sk);
133 struct inet_connection_sock *icsk = inet_csk(sk);
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct tcp_sock *tp = tcp_sk(sk);
136 struct in6_addr *saddr = NULL, *final_p, final;
137 struct rt6_info *rt;
138 struct flowi6 fl6;
139 struct dst_entry *dst;
140 int addr_type;
141 int err;
142
143 if (addr_len < SIN6_LEN_RFC2133)
144 return -EINVAL;
145
146 if (usin->sin6_family != AF_INET6)
147 return -EAFNOSUPPORT;
148
149 memset(&fl6, 0, sizeof(fl6));
150
151 if (np->sndflow) {
152 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
153 IP6_ECN_flow_init(fl6.flowlabel);
154 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
155 struct ip6_flowlabel *flowlabel;
156 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
157 if (flowlabel == NULL)
158 return -EINVAL;
159 fl6_sock_release(flowlabel);
160 }
161 }
162
163 /*
164 * connect() to INADDR_ANY means loopback (BSD'ism).
165 */
166
167 if (ipv6_addr_any(&usin->sin6_addr))
168 usin->sin6_addr.s6_addr[15] = 0x1;
169
170 addr_type = ipv6_addr_type(&usin->sin6_addr);
171
172 if (addr_type & IPV6_ADDR_MULTICAST)
173 return -ENETUNREACH;
174
175 if (addr_type&IPV6_ADDR_LINKLOCAL) {
176 if (addr_len >= sizeof(struct sockaddr_in6) &&
177 usin->sin6_scope_id) {
178 /* If interface is set while binding, indices
179 * must coincide.
180 */
181 if (sk->sk_bound_dev_if &&
182 sk->sk_bound_dev_if != usin->sin6_scope_id)
183 return -EINVAL;
184
185 sk->sk_bound_dev_if = usin->sin6_scope_id;
186 }
187
188 /* Connect to link-local address requires an interface */
189 if (!sk->sk_bound_dev_if)
190 return -EINVAL;
191 }
192
193 if (tp->rx_opt.ts_recent_stamp &&
194 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
195 tp->rx_opt.ts_recent = 0;
196 tp->rx_opt.ts_recent_stamp = 0;
197 tp->write_seq = 0;
198 }
199
200 sk->sk_v6_daddr = usin->sin6_addr;
201 np->flow_label = fl6.flowlabel;
202
203 /*
204 * TCP over IPv4
205 */
206
207 if (addr_type == IPV6_ADDR_MAPPED) {
208 u32 exthdrlen = icsk->icsk_ext_hdr_len;
209 struct sockaddr_in sin;
210
211 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
212
213 if (__ipv6_only_sock(sk))
214 return -ENETUNREACH;
215
216 sin.sin_family = AF_INET;
217 sin.sin_port = usin->sin6_port;
218 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
219
220 icsk->icsk_af_ops = &ipv6_mapped;
221 sk->sk_backlog_rcv = tcp_v4_do_rcv;
222 #ifdef CONFIG_TCP_MD5SIG
223 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
224 #endif
225
226 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
227
228 if (err) {
229 icsk->icsk_ext_hdr_len = exthdrlen;
230 icsk->icsk_af_ops = &ipv6_specific;
231 sk->sk_backlog_rcv = tcp_v6_do_rcv;
232 #ifdef CONFIG_TCP_MD5SIG
233 tp->af_specific = &tcp_sock_ipv6_specific;
234 #endif
235 goto failure;
236 } else {
237 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
238 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
239 &sk->sk_v6_rcv_saddr);
240 }
241
242 return err;
243 }
244
245 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
246 saddr = &sk->sk_v6_rcv_saddr;
247
248 fl6.flowi6_proto = IPPROTO_TCP;
249 fl6.daddr = sk->sk_v6_daddr;
250 fl6.saddr = saddr ? *saddr : np->saddr;
251 fl6.flowi6_oif = sk->sk_bound_dev_if;
252 fl6.flowi6_mark = sk->sk_mark;
253 fl6.fl6_dport = usin->sin6_port;
254 fl6.fl6_sport = inet->inet_sport;
255
256 final_p = fl6_update_dst(&fl6, np->opt, &final);
257
258 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
259
260 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
261 if (IS_ERR(dst)) {
262 err = PTR_ERR(dst);
263 goto failure;
264 }
265
266 if (saddr == NULL) {
267 saddr = &fl6.saddr;
268 sk->sk_v6_rcv_saddr = *saddr;
269 }
270
271 /* set the source address */
272 np->saddr = *saddr;
273 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
274
275 sk->sk_gso_type = SKB_GSO_TCPV6;
276 __ip6_dst_store(sk, dst, NULL, NULL);
277
278 rt = (struct rt6_info *) dst;
279 if (tcp_death_row.sysctl_tw_recycle &&
280 !tp->rx_opt.ts_recent_stamp &&
281 ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr))
282 tcp_fetch_timewait_stamp(sk, dst);
283
284 icsk->icsk_ext_hdr_len = 0;
285 if (np->opt)
286 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
287 np->opt->opt_nflen);
288
289 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
290
291 inet->inet_dport = usin->sin6_port;
292
293 tcp_set_state(sk, TCP_SYN_SENT);
294 err = inet6_hash_connect(&tcp_death_row, sk);
295 if (err)
296 goto late_failure;
297
298 ip6_set_txhash(sk);
299
300 if (!tp->write_seq && likely(!tp->repair))
301 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
302 sk->sk_v6_daddr.s6_addr32,
303 inet->inet_sport,
304 inet->inet_dport);
305
306 err = tcp_connect(sk);
307 if (err)
308 goto late_failure;
309
310 return 0;
311
312 late_failure:
313 tcp_set_state(sk, TCP_CLOSE);
314 __sk_dst_reset(sk);
315 failure:
316 inet->inet_dport = 0;
317 sk->sk_route_caps = 0;
318 return err;
319 }
320
321 static void tcp_v6_mtu_reduced(struct sock *sk)
322 {
323 struct dst_entry *dst;
324
325 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
326 return;
327
328 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
329 if (!dst)
330 return;
331
332 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
333 tcp_sync_mss(sk, dst_mtu(dst));
334 tcp_simple_retransmit(sk);
335 }
336 }
337
338 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
339 u8 type, u8 code, int offset, __be32 info)
340 {
341 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
342 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
343 struct ipv6_pinfo *np;
344 struct sock *sk;
345 int err;
346 struct tcp_sock *tp;
347 struct request_sock *fastopen;
348 __u32 seq, snd_una;
349 struct net *net = dev_net(skb->dev);
350
351 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
352 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
353
354 if (sk == NULL) {
355 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
356 ICMP6_MIB_INERRORS);
357 return;
358 }
359
360 if (sk->sk_state == TCP_TIME_WAIT) {
361 inet_twsk_put(inet_twsk(sk));
362 return;
363 }
364
365 bh_lock_sock(sk);
366 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
367 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
368
369 if (sk->sk_state == TCP_CLOSE)
370 goto out;
371
372 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
373 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
374 goto out;
375 }
376
377 tp = tcp_sk(sk);
378 seq = ntohl(th->seq);
379 /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
380 fastopen = tp->fastopen_rsk;
381 snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
382 if (sk->sk_state != TCP_LISTEN &&
383 !between(seq, snd_una, tp->snd_nxt)) {
384 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
385 goto out;
386 }
387
388 np = inet6_sk(sk);
389
390 if (type == NDISC_REDIRECT) {
391 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
392
393 if (dst)
394 dst->ops->redirect(dst, sk, skb);
395 goto out;
396 }
397
398 if (type == ICMPV6_PKT_TOOBIG) {
399 /* We are not interested in TCP_LISTEN and open_requests
400 * (SYN-ACKs send out by Linux are always <576bytes so
401 * they should go through unfragmented).
402 */
403 if (sk->sk_state == TCP_LISTEN)
404 goto out;
405
406 if (!ip6_sk_accept_pmtu(sk))
407 goto out;
408
409 tp->mtu_info = ntohl(info);
410 if (!sock_owned_by_user(sk))
411 tcp_v6_mtu_reduced(sk);
412 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
413 &tp->tsq_flags))
414 sock_hold(sk);
415 goto out;
416 }
417
418 icmpv6_err_convert(type, code, &err);
419
420 /* Might be for an request_sock */
421 switch (sk->sk_state) {
422 struct request_sock *req, **prev;
423 case TCP_LISTEN:
424 if (sock_owned_by_user(sk))
425 goto out;
426
427 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
428 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
429 &hdr->saddr, inet6_iif(skb));
430 if (!req)
431 goto out;
432
433 /* ICMPs are not backlogged, hence we cannot get
434 * an established socket here.
435 */
436 WARN_ON(req->sk != NULL);
437
438 if (seq != tcp_rsk(req)->snt_isn) {
439 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
440 goto out;
441 }
442
443 inet_csk_reqsk_queue_drop(sk, req, prev);
444 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
445 goto out;
446
447 case TCP_SYN_SENT:
448 case TCP_SYN_RECV:
449 /* Only in fast or simultaneous open. If a fast open socket is
450 * is already accepted it is treated as a connected one below.
451 */
452 if (fastopen && fastopen->sk == NULL)
453 break;
454
455 if (!sock_owned_by_user(sk)) {
456 sk->sk_err = err;
457 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
458
459 tcp_done(sk);
460 } else
461 sk->sk_err_soft = err;
462 goto out;
463 }
464
465 if (!sock_owned_by_user(sk) && np->recverr) {
466 sk->sk_err = err;
467 sk->sk_error_report(sk);
468 } else
469 sk->sk_err_soft = err;
470
471 out:
472 bh_unlock_sock(sk);
473 sock_put(sk);
474 }
475
476
477 static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
478 struct flowi *fl,
479 struct request_sock *req,
480 u16 queue_mapping,
481 struct tcp_fastopen_cookie *foc)
482 {
483 struct inet_request_sock *ireq = inet_rsk(req);
484 struct ipv6_pinfo *np = inet6_sk(sk);
485 struct flowi6 *fl6 = &fl->u.ip6;
486 struct sk_buff *skb;
487 int err = -ENOMEM;
488
489 /* First, grab a route. */
490 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL)
491 goto done;
492
493 skb = tcp_make_synack(sk, dst, req, foc);
494
495 if (skb) {
496 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
497 &ireq->ir_v6_rmt_addr);
498
499 fl6->daddr = ireq->ir_v6_rmt_addr;
500 if (np->repflow && (ireq->pktopts != NULL))
501 fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
502
503 skb_set_queue_mapping(skb, queue_mapping);
504 err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
505 err = net_xmit_eval(err);
506 }
507
508 done:
509 return err;
510 }
511
512
513 static void tcp_v6_reqsk_destructor(struct request_sock *req)
514 {
515 kfree_skb(inet_rsk(req)->pktopts);
516 }
517
518 #ifdef CONFIG_TCP_MD5SIG
519 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
520 const struct in6_addr *addr)
521 {
522 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
523 }
524
525 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
526 struct sock *addr_sk)
527 {
528 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
529 }
530
531 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
532 struct request_sock *req)
533 {
534 return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr);
535 }
536
537 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
538 int optlen)
539 {
540 struct tcp_md5sig cmd;
541 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
542
543 if (optlen < sizeof(cmd))
544 return -EINVAL;
545
546 if (copy_from_user(&cmd, optval, sizeof(cmd)))
547 return -EFAULT;
548
549 if (sin6->sin6_family != AF_INET6)
550 return -EINVAL;
551
552 if (!cmd.tcpm_keylen) {
553 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
554 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
555 AF_INET);
556 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
557 AF_INET6);
558 }
559
560 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
561 return -EINVAL;
562
563 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
564 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
565 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
566
567 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
568 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
569 }
570
571 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
572 const struct in6_addr *daddr,
573 const struct in6_addr *saddr, int nbytes)
574 {
575 struct tcp6_pseudohdr *bp;
576 struct scatterlist sg;
577
578 bp = &hp->md5_blk.ip6;
579 /* 1. TCP pseudo-header (RFC2460) */
580 bp->saddr = *saddr;
581 bp->daddr = *daddr;
582 bp->protocol = cpu_to_be32(IPPROTO_TCP);
583 bp->len = cpu_to_be32(nbytes);
584
585 sg_init_one(&sg, bp, sizeof(*bp));
586 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
587 }
588
589 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
590 const struct in6_addr *daddr, struct in6_addr *saddr,
591 const struct tcphdr *th)
592 {
593 struct tcp_md5sig_pool *hp;
594 struct hash_desc *desc;
595
596 hp = tcp_get_md5sig_pool();
597 if (!hp)
598 goto clear_hash_noput;
599 desc = &hp->md5_desc;
600
601 if (crypto_hash_init(desc))
602 goto clear_hash;
603 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
604 goto clear_hash;
605 if (tcp_md5_hash_header(hp, th))
606 goto clear_hash;
607 if (tcp_md5_hash_key(hp, key))
608 goto clear_hash;
609 if (crypto_hash_final(desc, md5_hash))
610 goto clear_hash;
611
612 tcp_put_md5sig_pool();
613 return 0;
614
615 clear_hash:
616 tcp_put_md5sig_pool();
617 clear_hash_noput:
618 memset(md5_hash, 0, 16);
619 return 1;
620 }
621
622 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
623 const struct sock *sk,
624 const struct request_sock *req,
625 const struct sk_buff *skb)
626 {
627 const struct in6_addr *saddr, *daddr;
628 struct tcp_md5sig_pool *hp;
629 struct hash_desc *desc;
630 const struct tcphdr *th = tcp_hdr(skb);
631
632 if (sk) {
633 saddr = &inet6_sk(sk)->saddr;
634 daddr = &sk->sk_v6_daddr;
635 } else if (req) {
636 saddr = &inet_rsk(req)->ir_v6_loc_addr;
637 daddr = &inet_rsk(req)->ir_v6_rmt_addr;
638 } else {
639 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
640 saddr = &ip6h->saddr;
641 daddr = &ip6h->daddr;
642 }
643
644 hp = tcp_get_md5sig_pool();
645 if (!hp)
646 goto clear_hash_noput;
647 desc = &hp->md5_desc;
648
649 if (crypto_hash_init(desc))
650 goto clear_hash;
651
652 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
653 goto clear_hash;
654 if (tcp_md5_hash_header(hp, th))
655 goto clear_hash;
656 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
657 goto clear_hash;
658 if (tcp_md5_hash_key(hp, key))
659 goto clear_hash;
660 if (crypto_hash_final(desc, md5_hash))
661 goto clear_hash;
662
663 tcp_put_md5sig_pool();
664 return 0;
665
666 clear_hash:
667 tcp_put_md5sig_pool();
668 clear_hash_noput:
669 memset(md5_hash, 0, 16);
670 return 1;
671 }
672
673 static int __tcp_v6_inbound_md5_hash(struct sock *sk,
674 const struct sk_buff *skb)
675 {
676 const __u8 *hash_location = NULL;
677 struct tcp_md5sig_key *hash_expected;
678 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
679 const struct tcphdr *th = tcp_hdr(skb);
680 int genhash;
681 u8 newhash[16];
682
683 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
684 hash_location = tcp_parse_md5sig_option(th);
685
686 /* We've parsed the options - do we have a hash? */
687 if (!hash_expected && !hash_location)
688 return 0;
689
690 if (hash_expected && !hash_location) {
691 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
692 return 1;
693 }
694
695 if (!hash_expected && hash_location) {
696 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
697 return 1;
698 }
699
700 /* check the signature */
701 genhash = tcp_v6_md5_hash_skb(newhash,
702 hash_expected,
703 NULL, NULL, skb);
704
705 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
706 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
707 genhash ? "failed" : "mismatch",
708 &ip6h->saddr, ntohs(th->source),
709 &ip6h->daddr, ntohs(th->dest));
710 return 1;
711 }
712 return 0;
713 }
714
715 static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
716 {
717 int ret;
718
719 rcu_read_lock();
720 ret = __tcp_v6_inbound_md5_hash(sk, skb);
721 rcu_read_unlock();
722
723 return ret;
724 }
725
726 #endif
727
728 static void tcp_v6_init_req(struct request_sock *req, struct sock *sk,
729 struct sk_buff *skb)
730 {
731 struct inet_request_sock *ireq = inet_rsk(req);
732 struct ipv6_pinfo *np = inet6_sk(sk);
733
734 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
735 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
736
737 ireq->ir_iif = sk->sk_bound_dev_if;
738
739 /* So that link locals have meaning */
740 if (!sk->sk_bound_dev_if &&
741 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
742 ireq->ir_iif = tcp_v6_iif(skb);
743
744 if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
745 (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) ||
746 np->rxopt.bits.rxinfo ||
747 np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
748 np->rxopt.bits.rxohlim || np->repflow)) {
749 atomic_inc(&skb->users);
750 ireq->pktopts = skb;
751 }
752 }
753
754 static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl,
755 const struct request_sock *req,
756 bool *strict)
757 {
758 if (strict)
759 *strict = true;
760 return inet6_csk_route_req(sk, &fl->u.ip6, req);
761 }
762
763 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
764 .family = AF_INET6,
765 .obj_size = sizeof(struct tcp6_request_sock),
766 .rtx_syn_ack = tcp_rtx_synack,
767 .send_ack = tcp_v6_reqsk_send_ack,
768 .destructor = tcp_v6_reqsk_destructor,
769 .send_reset = tcp_v6_send_reset,
770 .syn_ack_timeout = tcp_syn_ack_timeout,
771 };
772
773 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
774 .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
775 sizeof(struct ipv6hdr),
776 #ifdef CONFIG_TCP_MD5SIG
777 .md5_lookup = tcp_v6_reqsk_md5_lookup,
778 .calc_md5_hash = tcp_v6_md5_hash_skb,
779 #endif
780 .init_req = tcp_v6_init_req,
781 #ifdef CONFIG_SYN_COOKIES
782 .cookie_init_seq = cookie_v6_init_sequence,
783 #endif
784 .route_req = tcp_v6_route_req,
785 .init_seq = tcp_v6_init_sequence,
786 .send_synack = tcp_v6_send_synack,
787 .queue_hash_add = inet6_csk_reqsk_queue_hash_add,
788 };
789
790 static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq,
791 u32 ack, u32 win, u32 tsval, u32 tsecr,
792 int oif, struct tcp_md5sig_key *key, int rst,
793 u8 tclass, u32 label)
794 {
795 const struct tcphdr *th = tcp_hdr(skb);
796 struct tcphdr *t1;
797 struct sk_buff *buff;
798 struct flowi6 fl6;
799 struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
800 struct sock *ctl_sk = net->ipv6.tcp_sk;
801 unsigned int tot_len = sizeof(struct tcphdr);
802 struct dst_entry *dst;
803 __be32 *topt;
804
805 if (tsecr)
806 tot_len += TCPOLEN_TSTAMP_ALIGNED;
807 #ifdef CONFIG_TCP_MD5SIG
808 if (key)
809 tot_len += TCPOLEN_MD5SIG_ALIGNED;
810 #endif
811
812 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
813 GFP_ATOMIC);
814 if (buff == NULL)
815 return;
816
817 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
818
819 t1 = (struct tcphdr *) skb_push(buff, tot_len);
820 skb_reset_transport_header(buff);
821
822 /* Swap the send and the receive. */
823 memset(t1, 0, sizeof(*t1));
824 t1->dest = th->source;
825 t1->source = th->dest;
826 t1->doff = tot_len / 4;
827 t1->seq = htonl(seq);
828 t1->ack_seq = htonl(ack);
829 t1->ack = !rst || !th->ack;
830 t1->rst = rst;
831 t1->window = htons(win);
832
833 topt = (__be32 *)(t1 + 1);
834
835 if (tsecr) {
836 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
837 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
838 *topt++ = htonl(tsval);
839 *topt++ = htonl(tsecr);
840 }
841
842 #ifdef CONFIG_TCP_MD5SIG
843 if (key) {
844 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
845 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
846 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
847 &ipv6_hdr(skb)->saddr,
848 &ipv6_hdr(skb)->daddr, t1);
849 }
850 #endif
851
852 memset(&fl6, 0, sizeof(fl6));
853 fl6.daddr = ipv6_hdr(skb)->saddr;
854 fl6.saddr = ipv6_hdr(skb)->daddr;
855 fl6.flowlabel = label;
856
857 buff->ip_summed = CHECKSUM_PARTIAL;
858 buff->csum = 0;
859
860 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
861
862 fl6.flowi6_proto = IPPROTO_TCP;
863 if (rt6_need_strict(&fl6.daddr) && !oif)
864 fl6.flowi6_oif = tcp_v6_iif(skb);
865 else
866 fl6.flowi6_oif = oif;
867 fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark);
868 fl6.fl6_dport = t1->dest;
869 fl6.fl6_sport = t1->source;
870 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
871
872 /* Pass a socket to ip6_dst_lookup either it is for RST
873 * Underlying function will use this to retrieve the network
874 * namespace
875 */
876 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
877 if (!IS_ERR(dst)) {
878 skb_dst_set(buff, dst);
879 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
880 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
881 if (rst)
882 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
883 return;
884 }
885
886 kfree_skb(buff);
887 }
888
889 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
890 {
891 const struct tcphdr *th = tcp_hdr(skb);
892 u32 seq = 0, ack_seq = 0;
893 struct tcp_md5sig_key *key = NULL;
894 #ifdef CONFIG_TCP_MD5SIG
895 const __u8 *hash_location = NULL;
896 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
897 unsigned char newhash[16];
898 int genhash;
899 struct sock *sk1 = NULL;
900 #endif
901 int oif;
902
903 if (th->rst)
904 return;
905
906 /* If sk not NULL, it means we did a successful lookup and incoming
907 * route had to be correct. prequeue might have dropped our dst.
908 */
909 if (!sk && !ipv6_unicast_destination(skb))
910 return;
911
912 #ifdef CONFIG_TCP_MD5SIG
913 hash_location = tcp_parse_md5sig_option(th);
914 if (!sk && hash_location) {
915 /*
916 * active side is lost. Try to find listening socket through
917 * source port, and then find md5 key through listening socket.
918 * we are not loose security here:
919 * Incoming packet is checked with md5 hash with finding key,
920 * no RST generated if md5 hash doesn't match.
921 */
922 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
923 &tcp_hashinfo, &ipv6h->saddr,
924 th->source, &ipv6h->daddr,
925 ntohs(th->source), tcp_v6_iif(skb));
926 if (!sk1)
927 return;
928
929 rcu_read_lock();
930 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
931 if (!key)
932 goto release_sk1;
933
934 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb);
935 if (genhash || memcmp(hash_location, newhash, 16) != 0)
936 goto release_sk1;
937 } else {
938 key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
939 }
940 #endif
941
942 if (th->ack)
943 seq = ntohl(th->ack_seq);
944 else
945 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
946 (th->doff << 2);
947
948 oif = sk ? sk->sk_bound_dev_if : 0;
949 tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
950
951 #ifdef CONFIG_TCP_MD5SIG
952 release_sk1:
953 if (sk1) {
954 rcu_read_unlock();
955 sock_put(sk1);
956 }
957 #endif
958 }
959
960 static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq,
961 u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
962 struct tcp_md5sig_key *key, u8 tclass,
963 u32 label)
964 {
965 tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
966 tclass, label);
967 }
968
969 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
970 {
971 struct inet_timewait_sock *tw = inet_twsk(sk);
972 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
973
974 tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
975 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
976 tcp_time_stamp + tcptw->tw_ts_offset,
977 tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
978 tw->tw_tclass, (tw->tw_flowlabel << 12));
979
980 inet_twsk_put(tw);
981 }
982
983 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
984 struct request_sock *req)
985 {
986 /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
987 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
988 */
989 tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
990 tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
991 tcp_rsk(req)->rcv_nxt, req->rcv_wnd,
992 tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if,
993 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
994 0, 0);
995 }
996
997
998 static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb)
999 {
1000 struct request_sock *req, **prev;
1001 const struct tcphdr *th = tcp_hdr(skb);
1002 struct sock *nsk;
1003
1004 /* Find possible connection requests. */
1005 req = inet6_csk_search_req(sk, &prev, th->source,
1006 &ipv6_hdr(skb)->saddr,
1007 &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb));
1008 if (req)
1009 return tcp_check_req(sk, skb, req, prev, false);
1010
1011 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1012 &ipv6_hdr(skb)->saddr, th->source,
1013 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1014 tcp_v6_iif(skb));
1015
1016 if (nsk) {
1017 if (nsk->sk_state != TCP_TIME_WAIT) {
1018 bh_lock_sock(nsk);
1019 return nsk;
1020 }
1021 inet_twsk_put(inet_twsk(nsk));
1022 return NULL;
1023 }
1024
1025 #ifdef CONFIG_SYN_COOKIES
1026 if (!th->syn)
1027 sk = cookie_v6_check(sk, skb);
1028 #endif
1029 return sk;
1030 }
1031
1032 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1033 {
1034 if (skb->protocol == htons(ETH_P_IP))
1035 return tcp_v4_conn_request(sk, skb);
1036
1037 if (!ipv6_unicast_destination(skb))
1038 goto drop;
1039
1040 return tcp_conn_request(&tcp6_request_sock_ops,
1041 &tcp_request_sock_ipv6_ops, sk, skb);
1042
1043 drop:
1044 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1045 return 0; /* don't send reset */
1046 }
1047
1048 static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1049 struct request_sock *req,
1050 struct dst_entry *dst)
1051 {
1052 struct inet_request_sock *ireq;
1053 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1054 struct tcp6_sock *newtcp6sk;
1055 struct inet_sock *newinet;
1056 struct tcp_sock *newtp;
1057 struct sock *newsk;
1058 #ifdef CONFIG_TCP_MD5SIG
1059 struct tcp_md5sig_key *key;
1060 #endif
1061 struct flowi6 fl6;
1062
1063 if (skb->protocol == htons(ETH_P_IP)) {
1064 /*
1065 * v6 mapped
1066 */
1067
1068 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1069
1070 if (newsk == NULL)
1071 return NULL;
1072
1073 newtcp6sk = (struct tcp6_sock *)newsk;
1074 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1075
1076 newinet = inet_sk(newsk);
1077 newnp = inet6_sk(newsk);
1078 newtp = tcp_sk(newsk);
1079
1080 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1081
1082 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
1083
1084 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
1085
1086 newsk->sk_v6_rcv_saddr = newnp->saddr;
1087
1088 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1089 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1090 #ifdef CONFIG_TCP_MD5SIG
1091 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1092 #endif
1093
1094 newnp->ipv6_ac_list = NULL;
1095 newnp->ipv6_fl_list = NULL;
1096 newnp->pktoptions = NULL;
1097 newnp->opt = NULL;
1098 newnp->mcast_oif = tcp_v6_iif(skb);
1099 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1100 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1101 if (np->repflow)
1102 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1103
1104 /*
1105 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1106 * here, tcp_create_openreq_child now does this for us, see the comment in
1107 * that function for the gory details. -acme
1108 */
1109
1110 /* It is tricky place. Until this moment IPv4 tcp
1111 worked with IPv6 icsk.icsk_af_ops.
1112 Sync it now.
1113 */
1114 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1115
1116 return newsk;
1117 }
1118
1119 ireq = inet_rsk(req);
1120
1121 if (sk_acceptq_is_full(sk))
1122 goto out_overflow;
1123
1124 if (!dst) {
1125 dst = inet6_csk_route_req(sk, &fl6, req);
1126 if (!dst)
1127 goto out;
1128 }
1129
1130 newsk = tcp_create_openreq_child(sk, req, skb);
1131 if (newsk == NULL)
1132 goto out_nonewsk;
1133
1134 /*
1135 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1136 * count here, tcp_create_openreq_child now does this for us, see the
1137 * comment in that function for the gory details. -acme
1138 */
1139
1140 newsk->sk_gso_type = SKB_GSO_TCPV6;
1141 __ip6_dst_store(newsk, dst, NULL, NULL);
1142 inet6_sk_rx_dst_set(newsk, skb);
1143
1144 newtcp6sk = (struct tcp6_sock *)newsk;
1145 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1146
1147 newtp = tcp_sk(newsk);
1148 newinet = inet_sk(newsk);
1149 newnp = inet6_sk(newsk);
1150
1151 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1152
1153 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1154 newnp->saddr = ireq->ir_v6_loc_addr;
1155 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1156 newsk->sk_bound_dev_if = ireq->ir_iif;
1157
1158 ip6_set_txhash(newsk);
1159
1160 /* Now IPv6 options...
1161
1162 First: no IPv4 options.
1163 */
1164 newinet->inet_opt = NULL;
1165 newnp->ipv6_ac_list = NULL;
1166 newnp->ipv6_fl_list = NULL;
1167
1168 /* Clone RX bits */
1169 newnp->rxopt.all = np->rxopt.all;
1170
1171 /* Clone pktoptions received with SYN */
1172 newnp->pktoptions = NULL;
1173 if (ireq->pktopts != NULL) {
1174 newnp->pktoptions = skb_clone(ireq->pktopts,
1175 sk_gfp_atomic(sk, GFP_ATOMIC));
1176 consume_skb(ireq->pktopts);
1177 ireq->pktopts = NULL;
1178 if (newnp->pktoptions)
1179 skb_set_owner_r(newnp->pktoptions, newsk);
1180 }
1181 newnp->opt = NULL;
1182 newnp->mcast_oif = tcp_v6_iif(skb);
1183 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1184 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1185 if (np->repflow)
1186 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1187
1188 /* Clone native IPv6 options from listening socket (if any)
1189
1190 Yes, keeping reference count would be much more clever,
1191 but we make one more one thing there: reattach optmem
1192 to newsk.
1193 */
1194 if (np->opt)
1195 newnp->opt = ipv6_dup_options(newsk, np->opt);
1196
1197 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1198 if (newnp->opt)
1199 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1200 newnp->opt->opt_flen);
1201
1202 tcp_ca_openreq_child(newsk, dst);
1203
1204 tcp_sync_mss(newsk, dst_mtu(dst));
1205 newtp->advmss = dst_metric_advmss(dst);
1206 if (tcp_sk(sk)->rx_opt.user_mss &&
1207 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1208 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1209
1210 tcp_initialize_rcv_mss(newsk);
1211
1212 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1213 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1214
1215 #ifdef CONFIG_TCP_MD5SIG
1216 /* Copy over the MD5 key from the original socket */
1217 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1218 if (key != NULL) {
1219 /* We're using one, so create a matching key
1220 * on the newsk structure. If we fail to get
1221 * memory, then we end up not copying the key
1222 * across. Shucks.
1223 */
1224 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1225 AF_INET6, key->key, key->keylen,
1226 sk_gfp_atomic(sk, GFP_ATOMIC));
1227 }
1228 #endif
1229
1230 if (__inet_inherit_port(sk, newsk) < 0) {
1231 inet_csk_prepare_forced_close(newsk);
1232 tcp_done(newsk);
1233 goto out;
1234 }
1235 __inet6_hash(newsk, NULL);
1236
1237 return newsk;
1238
1239 out_overflow:
1240 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1241 out_nonewsk:
1242 dst_release(dst);
1243 out:
1244 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1245 return NULL;
1246 }
1247
1248 /* The socket must have it's spinlock held when we get
1249 * here.
1250 *
1251 * We have a potential double-lock case here, so even when
1252 * doing backlog processing we use the BH locking scheme.
1253 * This is because we cannot sleep with the original spinlock
1254 * held.
1255 */
1256 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1257 {
1258 struct ipv6_pinfo *np = inet6_sk(sk);
1259 struct tcp_sock *tp;
1260 struct sk_buff *opt_skb = NULL;
1261
1262 /* Imagine: socket is IPv6. IPv4 packet arrives,
1263 goes to IPv4 receive handler and backlogged.
1264 From backlog it always goes here. Kerboom...
1265 Fortunately, tcp_rcv_established and rcv_established
1266 handle them correctly, but it is not case with
1267 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1268 */
1269
1270 if (skb->protocol == htons(ETH_P_IP))
1271 return tcp_v4_do_rcv(sk, skb);
1272
1273 if (sk_filter(sk, skb))
1274 goto discard;
1275
1276 /*
1277 * socket locking is here for SMP purposes as backlog rcv
1278 * is currently called with bh processing disabled.
1279 */
1280
1281 /* Do Stevens' IPV6_PKTOPTIONS.
1282
1283 Yes, guys, it is the only place in our code, where we
1284 may make it not affecting IPv4.
1285 The rest of code is protocol independent,
1286 and I do not like idea to uglify IPv4.
1287
1288 Actually, all the idea behind IPV6_PKTOPTIONS
1289 looks not very well thought. For now we latch
1290 options, received in the last packet, enqueued
1291 by tcp. Feel free to propose better solution.
1292 --ANK (980728)
1293 */
1294 if (np->rxopt.all)
1295 opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
1296
1297 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1298 struct dst_entry *dst = sk->sk_rx_dst;
1299
1300 sock_rps_save_rxhash(sk, skb);
1301 sk_mark_napi_id(sk, skb);
1302 if (dst) {
1303 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1304 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1305 dst_release(dst);
1306 sk->sk_rx_dst = NULL;
1307 }
1308 }
1309
1310 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1311 if (opt_skb)
1312 goto ipv6_pktoptions;
1313 return 0;
1314 }
1315
1316 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1317 goto csum_err;
1318
1319 if (sk->sk_state == TCP_LISTEN) {
1320 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1321 if (!nsk)
1322 goto discard;
1323
1324 /*
1325 * Queue it on the new socket if the new socket is active,
1326 * otherwise we just shortcircuit this and continue with
1327 * the new socket..
1328 */
1329 if (nsk != sk) {
1330 sock_rps_save_rxhash(nsk, skb);
1331 sk_mark_napi_id(sk, skb);
1332 if (tcp_child_process(sk, nsk, skb))
1333 goto reset;
1334 if (opt_skb)
1335 __kfree_skb(opt_skb);
1336 return 0;
1337 }
1338 } else
1339 sock_rps_save_rxhash(sk, skb);
1340
1341 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1342 goto reset;
1343 if (opt_skb)
1344 goto ipv6_pktoptions;
1345 return 0;
1346
1347 reset:
1348 tcp_v6_send_reset(sk, skb);
1349 discard:
1350 if (opt_skb)
1351 __kfree_skb(opt_skb);
1352 kfree_skb(skb);
1353 return 0;
1354 csum_err:
1355 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
1356 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1357 goto discard;
1358
1359
1360 ipv6_pktoptions:
1361 /* Do you ask, what is it?
1362
1363 1. skb was enqueued by tcp.
1364 2. skb is added to tail of read queue, rather than out of order.
1365 3. socket is not in passive state.
1366 4. Finally, it really contains options, which user wants to receive.
1367 */
1368 tp = tcp_sk(sk);
1369 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1370 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1371 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1372 np->mcast_oif = tcp_v6_iif(opt_skb);
1373 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1374 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1375 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
1376 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
1377 if (np->repflow)
1378 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
1379 if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
1380 skb_set_owner_r(opt_skb, sk);
1381 opt_skb = xchg(&np->pktoptions, opt_skb);
1382 } else {
1383 __kfree_skb(opt_skb);
1384 opt_skb = xchg(&np->pktoptions, NULL);
1385 }
1386 }
1387
1388 kfree_skb(opt_skb);
1389 return 0;
1390 }
1391
1392 static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
1393 const struct tcphdr *th)
1394 {
1395 /* This is tricky: we move IP6CB at its correct location into
1396 * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
1397 * _decode_session6() uses IP6CB().
1398 * barrier() makes sure compiler won't play aliasing games.
1399 */
1400 memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
1401 sizeof(struct inet6_skb_parm));
1402 barrier();
1403
1404 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1405 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1406 skb->len - th->doff*4);
1407 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1408 TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
1409 TCP_SKB_CB(skb)->tcp_tw_isn = 0;
1410 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1411 TCP_SKB_CB(skb)->sacked = 0;
1412 }
1413
1414 static void tcp_v6_restore_cb(struct sk_buff *skb)
1415 {
1416 /* We need to move header back to the beginning if xfrm6_policy_check()
1417 * and tcp_v6_fill_cb() are going to be called again.
1418 */
1419 memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
1420 sizeof(struct inet6_skb_parm));
1421 }
1422
1423 static int tcp_v6_rcv(struct sk_buff *skb)
1424 {
1425 const struct tcphdr *th;
1426 const struct ipv6hdr *hdr;
1427 struct sock *sk;
1428 int ret;
1429 struct net *net = dev_net(skb->dev);
1430
1431 if (skb->pkt_type != PACKET_HOST)
1432 goto discard_it;
1433
1434 /*
1435 * Count it even if it's bad.
1436 */
1437 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1438
1439 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1440 goto discard_it;
1441
1442 th = tcp_hdr(skb);
1443
1444 if (th->doff < sizeof(struct tcphdr)/4)
1445 goto bad_packet;
1446 if (!pskb_may_pull(skb, th->doff*4))
1447 goto discard_it;
1448
1449 if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
1450 goto csum_error;
1451
1452 th = tcp_hdr(skb);
1453 hdr = ipv6_hdr(skb);
1454
1455 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest,
1456 inet6_iif(skb));
1457 if (!sk)
1458 goto no_tcp_socket;
1459
1460 process:
1461 if (sk->sk_state == TCP_TIME_WAIT)
1462 goto do_time_wait;
1463
1464 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1465 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1466 goto discard_and_relse;
1467 }
1468
1469 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1470 goto discard_and_relse;
1471
1472 tcp_v6_fill_cb(skb, hdr, th);
1473
1474 #ifdef CONFIG_TCP_MD5SIG
1475 if (tcp_v6_inbound_md5_hash(sk, skb))
1476 goto discard_and_relse;
1477 #endif
1478
1479 if (sk_filter(sk, skb))
1480 goto discard_and_relse;
1481
1482 sk_incoming_cpu_update(sk);
1483 skb->dev = NULL;
1484
1485 bh_lock_sock_nested(sk);
1486 ret = 0;
1487 if (!sock_owned_by_user(sk)) {
1488 if (!tcp_prequeue(sk, skb))
1489 ret = tcp_v6_do_rcv(sk, skb);
1490 } else if (unlikely(sk_add_backlog(sk, skb,
1491 sk->sk_rcvbuf + sk->sk_sndbuf))) {
1492 bh_unlock_sock(sk);
1493 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1494 goto discard_and_relse;
1495 }
1496 bh_unlock_sock(sk);
1497
1498 sock_put(sk);
1499 return ret ? -1 : 0;
1500
1501 no_tcp_socket:
1502 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1503 goto discard_it;
1504
1505 tcp_v6_fill_cb(skb, hdr, th);
1506
1507 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1508 csum_error:
1509 TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
1510 bad_packet:
1511 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1512 } else {
1513 tcp_v6_send_reset(NULL, skb);
1514 }
1515
1516 discard_it:
1517 kfree_skb(skb);
1518 return 0;
1519
1520 discard_and_relse:
1521 sock_put(sk);
1522 goto discard_it;
1523
1524 do_time_wait:
1525 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1526 inet_twsk_put(inet_twsk(sk));
1527 goto discard_it;
1528 }
1529
1530 tcp_v6_fill_cb(skb, hdr, th);
1531
1532 if (skb->len < (th->doff<<2)) {
1533 inet_twsk_put(inet_twsk(sk));
1534 goto bad_packet;
1535 }
1536 if (tcp_checksum_complete(skb)) {
1537 inet_twsk_put(inet_twsk(sk));
1538 goto csum_error;
1539 }
1540
1541 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1542 case TCP_TW_SYN:
1543 {
1544 struct sock *sk2;
1545
1546 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1547 &ipv6_hdr(skb)->saddr, th->source,
1548 &ipv6_hdr(skb)->daddr,
1549 ntohs(th->dest), tcp_v6_iif(skb));
1550 if (sk2 != NULL) {
1551 struct inet_timewait_sock *tw = inet_twsk(sk);
1552 inet_twsk_deschedule(tw, &tcp_death_row);
1553 inet_twsk_put(tw);
1554 sk = sk2;
1555 tcp_v6_restore_cb(skb);
1556 goto process;
1557 }
1558 /* Fall through to ACK */
1559 }
1560 case TCP_TW_ACK:
1561 tcp_v6_timewait_ack(sk, skb);
1562 break;
1563 case TCP_TW_RST:
1564 tcp_v6_restore_cb(skb);
1565 goto no_tcp_socket;
1566 case TCP_TW_SUCCESS:
1567 ;
1568 }
1569 goto discard_it;
1570 }
1571
1572 static void tcp_v6_early_demux(struct sk_buff *skb)
1573 {
1574 const struct ipv6hdr *hdr;
1575 const struct tcphdr *th;
1576 struct sock *sk;
1577
1578 if (skb->pkt_type != PACKET_HOST)
1579 return;
1580
1581 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1582 return;
1583
1584 hdr = ipv6_hdr(skb);
1585 th = tcp_hdr(skb);
1586
1587 if (th->doff < sizeof(struct tcphdr) / 4)
1588 return;
1589
1590 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
1591 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1592 &hdr->saddr, th->source,
1593 &hdr->daddr, ntohs(th->dest),
1594 inet6_iif(skb));
1595 if (sk) {
1596 skb->sk = sk;
1597 skb->destructor = sock_edemux;
1598 if (sk->sk_state != TCP_TIME_WAIT) {
1599 struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
1600
1601 if (dst)
1602 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1603 if (dst &&
1604 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1605 skb_dst_set_noref(skb, dst);
1606 }
1607 }
1608 }
1609
1610 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1611 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1612 .twsk_unique = tcp_twsk_unique,
1613 .twsk_destructor = tcp_twsk_destructor,
1614 };
1615
1616 static const struct inet_connection_sock_af_ops ipv6_specific = {
1617 .queue_xmit = inet6_csk_xmit,
1618 .send_check = tcp_v6_send_check,
1619 .rebuild_header = inet6_sk_rebuild_header,
1620 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1621 .conn_request = tcp_v6_conn_request,
1622 .syn_recv_sock = tcp_v6_syn_recv_sock,
1623 .net_header_len = sizeof(struct ipv6hdr),
1624 .net_frag_header_len = sizeof(struct frag_hdr),
1625 .setsockopt = ipv6_setsockopt,
1626 .getsockopt = ipv6_getsockopt,
1627 .addr2sockaddr = inet6_csk_addr2sockaddr,
1628 .sockaddr_len = sizeof(struct sockaddr_in6),
1629 .bind_conflict = inet6_csk_bind_conflict,
1630 #ifdef CONFIG_COMPAT
1631 .compat_setsockopt = compat_ipv6_setsockopt,
1632 .compat_getsockopt = compat_ipv6_getsockopt,
1633 #endif
1634 .mtu_reduced = tcp_v6_mtu_reduced,
1635 };
1636
1637 #ifdef CONFIG_TCP_MD5SIG
1638 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1639 .md5_lookup = tcp_v6_md5_lookup,
1640 .calc_md5_hash = tcp_v6_md5_hash_skb,
1641 .md5_parse = tcp_v6_parse_md5_keys,
1642 };
1643 #endif
1644
1645 /*
1646 * TCP over IPv4 via INET6 API
1647 */
1648 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1649 .queue_xmit = ip_queue_xmit,
1650 .send_check = tcp_v4_send_check,
1651 .rebuild_header = inet_sk_rebuild_header,
1652 .sk_rx_dst_set = inet_sk_rx_dst_set,
1653 .conn_request = tcp_v6_conn_request,
1654 .syn_recv_sock = tcp_v6_syn_recv_sock,
1655 .net_header_len = sizeof(struct iphdr),
1656 .setsockopt = ipv6_setsockopt,
1657 .getsockopt = ipv6_getsockopt,
1658 .addr2sockaddr = inet6_csk_addr2sockaddr,
1659 .sockaddr_len = sizeof(struct sockaddr_in6),
1660 .bind_conflict = inet6_csk_bind_conflict,
1661 #ifdef CONFIG_COMPAT
1662 .compat_setsockopt = compat_ipv6_setsockopt,
1663 .compat_getsockopt = compat_ipv6_getsockopt,
1664 #endif
1665 .mtu_reduced = tcp_v4_mtu_reduced,
1666 };
1667
1668 #ifdef CONFIG_TCP_MD5SIG
1669 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1670 .md5_lookup = tcp_v4_md5_lookup,
1671 .calc_md5_hash = tcp_v4_md5_hash_skb,
1672 .md5_parse = tcp_v6_parse_md5_keys,
1673 };
1674 #endif
1675
1676 /* NOTE: A lot of things set to zero explicitly by call to
1677 * sk_alloc() so need not be done here.
1678 */
1679 static int tcp_v6_init_sock(struct sock *sk)
1680 {
1681 struct inet_connection_sock *icsk = inet_csk(sk);
1682
1683 tcp_init_sock(sk);
1684
1685 icsk->icsk_af_ops = &ipv6_specific;
1686
1687 #ifdef CONFIG_TCP_MD5SIG
1688 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1689 #endif
1690
1691 return 0;
1692 }
1693
1694 static void tcp_v6_destroy_sock(struct sock *sk)
1695 {
1696 tcp_v4_destroy_sock(sk);
1697 inet6_destroy_sock(sk);
1698 }
1699
1700 #ifdef CONFIG_PROC_FS
1701 /* Proc filesystem TCPv6 sock list dumping. */
1702 static void get_openreq6(struct seq_file *seq,
1703 const struct sock *sk, struct request_sock *req, int i, kuid_t uid)
1704 {
1705 int ttd = req->expires - jiffies;
1706 const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
1707 const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
1708
1709 if (ttd < 0)
1710 ttd = 0;
1711
1712 seq_printf(seq,
1713 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1714 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1715 i,
1716 src->s6_addr32[0], src->s6_addr32[1],
1717 src->s6_addr32[2], src->s6_addr32[3],
1718 inet_rsk(req)->ir_num,
1719 dest->s6_addr32[0], dest->s6_addr32[1],
1720 dest->s6_addr32[2], dest->s6_addr32[3],
1721 ntohs(inet_rsk(req)->ir_rmt_port),
1722 TCP_SYN_RECV,
1723 0, 0, /* could print option size, but that is af dependent. */
1724 1, /* timers active (only the expire timer) */
1725 jiffies_to_clock_t(ttd),
1726 req->num_timeout,
1727 from_kuid_munged(seq_user_ns(seq), uid),
1728 0, /* non standard timer */
1729 0, /* open_requests have no inode */
1730 0, req);
1731 }
1732
1733 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1734 {
1735 const struct in6_addr *dest, *src;
1736 __u16 destp, srcp;
1737 int timer_active;
1738 unsigned long timer_expires;
1739 const struct inet_sock *inet = inet_sk(sp);
1740 const struct tcp_sock *tp = tcp_sk(sp);
1741 const struct inet_connection_sock *icsk = inet_csk(sp);
1742 struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq;
1743
1744 dest = &sp->sk_v6_daddr;
1745 src = &sp->sk_v6_rcv_saddr;
1746 destp = ntohs(inet->inet_dport);
1747 srcp = ntohs(inet->inet_sport);
1748
1749 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1750 timer_active = 1;
1751 timer_expires = icsk->icsk_timeout;
1752 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1753 timer_active = 4;
1754 timer_expires = icsk->icsk_timeout;
1755 } else if (timer_pending(&sp->sk_timer)) {
1756 timer_active = 2;
1757 timer_expires = sp->sk_timer.expires;
1758 } else {
1759 timer_active = 0;
1760 timer_expires = jiffies;
1761 }
1762
1763 seq_printf(seq,
1764 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1765 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
1766 i,
1767 src->s6_addr32[0], src->s6_addr32[1],
1768 src->s6_addr32[2], src->s6_addr32[3], srcp,
1769 dest->s6_addr32[0], dest->s6_addr32[1],
1770 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1771 sp->sk_state,
1772 tp->write_seq-tp->snd_una,
1773 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1774 timer_active,
1775 jiffies_delta_to_clock_t(timer_expires - jiffies),
1776 icsk->icsk_retransmits,
1777 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1778 icsk->icsk_probes_out,
1779 sock_i_ino(sp),
1780 atomic_read(&sp->sk_refcnt), sp,
1781 jiffies_to_clock_t(icsk->icsk_rto),
1782 jiffies_to_clock_t(icsk->icsk_ack.ato),
1783 (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
1784 tp->snd_cwnd,
1785 sp->sk_state == TCP_LISTEN ?
1786 (fastopenq ? fastopenq->max_qlen : 0) :
1787 (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
1788 );
1789 }
1790
1791 static void get_timewait6_sock(struct seq_file *seq,
1792 struct inet_timewait_sock *tw, int i)
1793 {
1794 const struct in6_addr *dest, *src;
1795 __u16 destp, srcp;
1796 s32 delta = tw->tw_ttd - inet_tw_time_stamp();
1797
1798 dest = &tw->tw_v6_daddr;
1799 src = &tw->tw_v6_rcv_saddr;
1800 destp = ntohs(tw->tw_dport);
1801 srcp = ntohs(tw->tw_sport);
1802
1803 seq_printf(seq,
1804 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1805 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1806 i,
1807 src->s6_addr32[0], src->s6_addr32[1],
1808 src->s6_addr32[2], src->s6_addr32[3], srcp,
1809 dest->s6_addr32[0], dest->s6_addr32[1],
1810 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1811 tw->tw_substate, 0, 0,
1812 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1813 atomic_read(&tw->tw_refcnt), tw);
1814 }
1815
1816 static int tcp6_seq_show(struct seq_file *seq, void *v)
1817 {
1818 struct tcp_iter_state *st;
1819 struct sock *sk = v;
1820
1821 if (v == SEQ_START_TOKEN) {
1822 seq_puts(seq,
1823 " sl "
1824 "local_address "
1825 "remote_address "
1826 "st tx_queue rx_queue tr tm->when retrnsmt"
1827 " uid timeout inode\n");
1828 goto out;
1829 }
1830 st = seq->private;
1831
1832 switch (st->state) {
1833 case TCP_SEQ_STATE_LISTENING:
1834 case TCP_SEQ_STATE_ESTABLISHED:
1835 if (sk->sk_state == TCP_TIME_WAIT)
1836 get_timewait6_sock(seq, v, st->num);
1837 else
1838 get_tcp6_sock(seq, v, st->num);
1839 break;
1840 case TCP_SEQ_STATE_OPENREQ:
1841 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
1842 break;
1843 }
1844 out:
1845 return 0;
1846 }
1847
1848 static const struct file_operations tcp6_afinfo_seq_fops = {
1849 .owner = THIS_MODULE,
1850 .open = tcp_seq_open,
1851 .read = seq_read,
1852 .llseek = seq_lseek,
1853 .release = seq_release_net
1854 };
1855
1856 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1857 .name = "tcp6",
1858 .family = AF_INET6,
1859 .seq_fops = &tcp6_afinfo_seq_fops,
1860 .seq_ops = {
1861 .show = tcp6_seq_show,
1862 },
1863 };
1864
1865 int __net_init tcp6_proc_init(struct net *net)
1866 {
1867 return tcp_proc_register(net, &tcp6_seq_afinfo);
1868 }
1869
1870 void tcp6_proc_exit(struct net *net)
1871 {
1872 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1873 }
1874 #endif
1875
1876 static void tcp_v6_clear_sk(struct sock *sk, int size)
1877 {
1878 struct inet_sock *inet = inet_sk(sk);
1879
1880 /* we do not want to clear pinet6 field, because of RCU lookups */
1881 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6));
1882
1883 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1884 memset(&inet->pinet6 + 1, 0, size);
1885 }
1886
1887 struct proto tcpv6_prot = {
1888 .name = "TCPv6",
1889 .owner = THIS_MODULE,
1890 .close = tcp_close,
1891 .connect = tcp_v6_connect,
1892 .disconnect = tcp_disconnect,
1893 .accept = inet_csk_accept,
1894 .ioctl = tcp_ioctl,
1895 .init = tcp_v6_init_sock,
1896 .destroy = tcp_v6_destroy_sock,
1897 .shutdown = tcp_shutdown,
1898 .setsockopt = tcp_setsockopt,
1899 .getsockopt = tcp_getsockopt,
1900 .recvmsg = tcp_recvmsg,
1901 .sendmsg = tcp_sendmsg,
1902 .sendpage = tcp_sendpage,
1903 .backlog_rcv = tcp_v6_do_rcv,
1904 .release_cb = tcp_release_cb,
1905 .hash = tcp_v6_hash,
1906 .unhash = inet_unhash,
1907 .get_port = inet_csk_get_port,
1908 .enter_memory_pressure = tcp_enter_memory_pressure,
1909 .stream_memory_free = tcp_stream_memory_free,
1910 .sockets_allocated = &tcp_sockets_allocated,
1911 .memory_allocated = &tcp_memory_allocated,
1912 .memory_pressure = &tcp_memory_pressure,
1913 .orphan_count = &tcp_orphan_count,
1914 .sysctl_mem = sysctl_tcp_mem,
1915 .sysctl_wmem = sysctl_tcp_wmem,
1916 .sysctl_rmem = sysctl_tcp_rmem,
1917 .max_header = MAX_TCP_HEADER,
1918 .obj_size = sizeof(struct tcp6_sock),
1919 .slab_flags = SLAB_DESTROY_BY_RCU,
1920 .twsk_prot = &tcp6_timewait_sock_ops,
1921 .rsk_prot = &tcp6_request_sock_ops,
1922 .h.hashinfo = &tcp_hashinfo,
1923 .no_autobind = true,
1924 #ifdef CONFIG_COMPAT
1925 .compat_setsockopt = compat_tcp_setsockopt,
1926 .compat_getsockopt = compat_tcp_getsockopt,
1927 #endif
1928 #ifdef CONFIG_MEMCG_KMEM
1929 .proto_cgroup = tcp_proto_cgroup,
1930 #endif
1931 .clear_sk = tcp_v6_clear_sk,
1932 };
1933
1934 static const struct inet6_protocol tcpv6_protocol = {
1935 .early_demux = tcp_v6_early_demux,
1936 .handler = tcp_v6_rcv,
1937 .err_handler = tcp_v6_err,
1938 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1939 };
1940
1941 static struct inet_protosw tcpv6_protosw = {
1942 .type = SOCK_STREAM,
1943 .protocol = IPPROTO_TCP,
1944 .prot = &tcpv6_prot,
1945 .ops = &inet6_stream_ops,
1946 .flags = INET_PROTOSW_PERMANENT |
1947 INET_PROTOSW_ICSK,
1948 };
1949
1950 static int __net_init tcpv6_net_init(struct net *net)
1951 {
1952 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1953 SOCK_RAW, IPPROTO_TCP, net);
1954 }
1955
1956 static void __net_exit tcpv6_net_exit(struct net *net)
1957 {
1958 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1959 }
1960
1961 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1962 {
1963 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1964 }
1965
1966 static struct pernet_operations tcpv6_net_ops = {
1967 .init = tcpv6_net_init,
1968 .exit = tcpv6_net_exit,
1969 .exit_batch = tcpv6_net_exit_batch,
1970 };
1971
1972 int __init tcpv6_init(void)
1973 {
1974 int ret;
1975
1976 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1977 if (ret)
1978 goto out;
1979
1980 /* register inet6 protocol */
1981 ret = inet6_register_protosw(&tcpv6_protosw);
1982 if (ret)
1983 goto out_tcpv6_protocol;
1984
1985 ret = register_pernet_subsys(&tcpv6_net_ops);
1986 if (ret)
1987 goto out_tcpv6_protosw;
1988 out:
1989 return ret;
1990
1991 out_tcpv6_protosw:
1992 inet6_unregister_protosw(&tcpv6_protosw);
1993 out_tcpv6_protocol:
1994 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1995 goto out;
1996 }
1997
1998 void tcpv6_exit(void)
1999 {
2000 unregister_pernet_subsys(&tcpv6_net_ops);
2001 inet6_unregister_protosw(&tcpv6_protosw);
2002 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2003 }
Linux kernel - Deliverables
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