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net: rename ICMP6_INC_STATS_BH()
[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/busy_poll.h>
65
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68
69 #include <crypto/hash.h>
70 #include <linux/scatterlist.h>
71
72 static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb);
73 static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
74 struct request_sock *req);
75
76 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
77
78 static const struct inet_connection_sock_af_ops ipv6_mapped;
79 static const struct inet_connection_sock_af_ops ipv6_specific;
80 #ifdef CONFIG_TCP_MD5SIG
81 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
82 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
83 #else
84 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
85 const struct in6_addr *addr)
86 {
87 return NULL;
88 }
89 #endif
90
91 static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
92 {
93 struct dst_entry *dst = skb_dst(skb);
94
95 if (dst && dst_hold_safe(dst)) {
96 const struct rt6_info *rt = (const struct rt6_info *)dst;
97
98 sk->sk_rx_dst = dst;
99 inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
100 inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt);
101 }
102 }
103
104 static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
105 {
106 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
107 ipv6_hdr(skb)->saddr.s6_addr32,
108 tcp_hdr(skb)->dest,
109 tcp_hdr(skb)->source);
110 }
111
112 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
113 int addr_len)
114 {
115 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
116 struct inet_sock *inet = inet_sk(sk);
117 struct inet_connection_sock *icsk = inet_csk(sk);
118 struct ipv6_pinfo *np = inet6_sk(sk);
119 struct tcp_sock *tp = tcp_sk(sk);
120 struct in6_addr *saddr = NULL, *final_p, final;
121 struct ipv6_txoptions *opt;
122 struct flowi6 fl6;
123 struct dst_entry *dst;
124 int addr_type;
125 int err;
126
127 if (addr_len < SIN6_LEN_RFC2133)
128 return -EINVAL;
129
130 if (usin->sin6_family != AF_INET6)
131 return -EAFNOSUPPORT;
132
133 memset(&fl6, 0, sizeof(fl6));
134
135 if (np->sndflow) {
136 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
137 IP6_ECN_flow_init(fl6.flowlabel);
138 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
139 struct ip6_flowlabel *flowlabel;
140 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
141 if (!flowlabel)
142 return -EINVAL;
143 fl6_sock_release(flowlabel);
144 }
145 }
146
147 /*
148 * connect() to INADDR_ANY means loopback (BSD'ism).
149 */
150
151 if (ipv6_addr_any(&usin->sin6_addr))
152 usin->sin6_addr.s6_addr[15] = 0x1;
153
154 addr_type = ipv6_addr_type(&usin->sin6_addr);
155
156 if (addr_type & IPV6_ADDR_MULTICAST)
157 return -ENETUNREACH;
158
159 if (addr_type&IPV6_ADDR_LINKLOCAL) {
160 if (addr_len >= sizeof(struct sockaddr_in6) &&
161 usin->sin6_scope_id) {
162 /* If interface is set while binding, indices
163 * must coincide.
164 */
165 if (sk->sk_bound_dev_if &&
166 sk->sk_bound_dev_if != usin->sin6_scope_id)
167 return -EINVAL;
168
169 sk->sk_bound_dev_if = usin->sin6_scope_id;
170 }
171
172 /* Connect to link-local address requires an interface */
173 if (!sk->sk_bound_dev_if)
174 return -EINVAL;
175 }
176
177 if (tp->rx_opt.ts_recent_stamp &&
178 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
179 tp->rx_opt.ts_recent = 0;
180 tp->rx_opt.ts_recent_stamp = 0;
181 tp->write_seq = 0;
182 }
183
184 sk->sk_v6_daddr = usin->sin6_addr;
185 np->flow_label = fl6.flowlabel;
186
187 /*
188 * TCP over IPv4
189 */
190
191 if (addr_type == IPV6_ADDR_MAPPED) {
192 u32 exthdrlen = icsk->icsk_ext_hdr_len;
193 struct sockaddr_in sin;
194
195 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
196
197 if (__ipv6_only_sock(sk))
198 return -ENETUNREACH;
199
200 sin.sin_family = AF_INET;
201 sin.sin_port = usin->sin6_port;
202 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
203
204 icsk->icsk_af_ops = &ipv6_mapped;
205 sk->sk_backlog_rcv = tcp_v4_do_rcv;
206 #ifdef CONFIG_TCP_MD5SIG
207 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
208 #endif
209
210 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
211
212 if (err) {
213 icsk->icsk_ext_hdr_len = exthdrlen;
214 icsk->icsk_af_ops = &ipv6_specific;
215 sk->sk_backlog_rcv = tcp_v6_do_rcv;
216 #ifdef CONFIG_TCP_MD5SIG
217 tp->af_specific = &tcp_sock_ipv6_specific;
218 #endif
219 goto failure;
220 }
221 np->saddr = sk->sk_v6_rcv_saddr;
222
223 return err;
224 }
225
226 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
227 saddr = &sk->sk_v6_rcv_saddr;
228
229 fl6.flowi6_proto = IPPROTO_TCP;
230 fl6.daddr = sk->sk_v6_daddr;
231 fl6.saddr = saddr ? *saddr : np->saddr;
232 fl6.flowi6_oif = sk->sk_bound_dev_if;
233 fl6.flowi6_mark = sk->sk_mark;
234 fl6.fl6_dport = usin->sin6_port;
235 fl6.fl6_sport = inet->inet_sport;
236
237 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
238 final_p = fl6_update_dst(&fl6, opt, &final);
239
240 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
241
242 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
243 if (IS_ERR(dst)) {
244 err = PTR_ERR(dst);
245 goto failure;
246 }
247
248 if (!saddr) {
249 saddr = &fl6.saddr;
250 sk->sk_v6_rcv_saddr = *saddr;
251 }
252
253 /* set the source address */
254 np->saddr = *saddr;
255 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
256
257 sk->sk_gso_type = SKB_GSO_TCPV6;
258 ip6_dst_store(sk, dst, NULL, NULL);
259
260 if (tcp_death_row.sysctl_tw_recycle &&
261 !tp->rx_opt.ts_recent_stamp &&
262 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr))
263 tcp_fetch_timewait_stamp(sk, dst);
264
265 icsk->icsk_ext_hdr_len = 0;
266 if (opt)
267 icsk->icsk_ext_hdr_len = opt->opt_flen +
268 opt->opt_nflen;
269
270 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
271
272 inet->inet_dport = usin->sin6_port;
273
274 tcp_set_state(sk, TCP_SYN_SENT);
275 err = inet6_hash_connect(&tcp_death_row, sk);
276 if (err)
277 goto late_failure;
278
279 sk_set_txhash(sk);
280
281 if (!tp->write_seq && likely(!tp->repair))
282 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
283 sk->sk_v6_daddr.s6_addr32,
284 inet->inet_sport,
285 inet->inet_dport);
286
287 err = tcp_connect(sk);
288 if (err)
289 goto late_failure;
290
291 return 0;
292
293 late_failure:
294 tcp_set_state(sk, TCP_CLOSE);
295 __sk_dst_reset(sk);
296 failure:
297 inet->inet_dport = 0;
298 sk->sk_route_caps = 0;
299 return err;
300 }
301
302 static void tcp_v6_mtu_reduced(struct sock *sk)
303 {
304 struct dst_entry *dst;
305
306 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
307 return;
308
309 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
310 if (!dst)
311 return;
312
313 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
314 tcp_sync_mss(sk, dst_mtu(dst));
315 tcp_simple_retransmit(sk);
316 }
317 }
318
319 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
320 u8 type, u8 code, int offset, __be32 info)
321 {
322 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
323 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
324 struct net *net = dev_net(skb->dev);
325 struct request_sock *fastopen;
326 struct ipv6_pinfo *np;
327 struct tcp_sock *tp;
328 __u32 seq, snd_una;
329 struct sock *sk;
330 bool fatal;
331 int err;
332
333 sk = __inet6_lookup_established(net, &tcp_hashinfo,
334 &hdr->daddr, th->dest,
335 &hdr->saddr, ntohs(th->source),
336 skb->dev->ifindex);
337
338 if (!sk) {
339 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
340 ICMP6_MIB_INERRORS);
341 return;
342 }
343
344 if (sk->sk_state == TCP_TIME_WAIT) {
345 inet_twsk_put(inet_twsk(sk));
346 return;
347 }
348 seq = ntohl(th->seq);
349 fatal = icmpv6_err_convert(type, code, &err);
350 if (sk->sk_state == TCP_NEW_SYN_RECV)
351 return tcp_req_err(sk, seq, fatal);
352
353 bh_lock_sock(sk);
354 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
355 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
356
357 if (sk->sk_state == TCP_CLOSE)
358 goto out;
359
360 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
361 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
362 goto out;
363 }
364
365 tp = tcp_sk(sk);
366 /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
367 fastopen = tp->fastopen_rsk;
368 snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
369 if (sk->sk_state != TCP_LISTEN &&
370 !between(seq, snd_una, tp->snd_nxt)) {
371 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
372 goto out;
373 }
374
375 np = inet6_sk(sk);
376
377 if (type == NDISC_REDIRECT) {
378 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
379
380 if (dst)
381 dst->ops->redirect(dst, sk, skb);
382 goto out;
383 }
384
385 if (type == ICMPV6_PKT_TOOBIG) {
386 /* We are not interested in TCP_LISTEN and open_requests
387 * (SYN-ACKs send out by Linux are always <576bytes so
388 * they should go through unfragmented).
389 */
390 if (sk->sk_state == TCP_LISTEN)
391 goto out;
392
393 if (!ip6_sk_accept_pmtu(sk))
394 goto out;
395
396 tp->mtu_info = ntohl(info);
397 if (!sock_owned_by_user(sk))
398 tcp_v6_mtu_reduced(sk);
399 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
400 &tp->tsq_flags))
401 sock_hold(sk);
402 goto out;
403 }
404
405
406 /* Might be for an request_sock */
407 switch (sk->sk_state) {
408 case TCP_SYN_SENT:
409 case TCP_SYN_RECV:
410 /* Only in fast or simultaneous open. If a fast open socket is
411 * is already accepted it is treated as a connected one below.
412 */
413 if (fastopen && !fastopen->sk)
414 break;
415
416 if (!sock_owned_by_user(sk)) {
417 sk->sk_err = err;
418 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
419
420 tcp_done(sk);
421 } else
422 sk->sk_err_soft = err;
423 goto out;
424 }
425
426 if (!sock_owned_by_user(sk) && np->recverr) {
427 sk->sk_err = err;
428 sk->sk_error_report(sk);
429 } else
430 sk->sk_err_soft = err;
431
432 out:
433 bh_unlock_sock(sk);
434 sock_put(sk);
435 }
436
437
438 static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
439 struct flowi *fl,
440 struct request_sock *req,
441 struct tcp_fastopen_cookie *foc,
442 enum tcp_synack_type synack_type)
443 {
444 struct inet_request_sock *ireq = inet_rsk(req);
445 struct ipv6_pinfo *np = inet6_sk(sk);
446 struct flowi6 *fl6 = &fl->u.ip6;
447 struct sk_buff *skb;
448 int err = -ENOMEM;
449
450 /* First, grab a route. */
451 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
452 IPPROTO_TCP)) == NULL)
453 goto done;
454
455 skb = tcp_make_synack(sk, dst, req, foc, synack_type);
456
457 if (skb) {
458 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
459 &ireq->ir_v6_rmt_addr);
460
461 fl6->daddr = ireq->ir_v6_rmt_addr;
462 if (np->repflow && ireq->pktopts)
463 fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
464
465 rcu_read_lock();
466 err = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt),
467 np->tclass);
468 rcu_read_unlock();
469 err = net_xmit_eval(err);
470 }
471
472 done:
473 return err;
474 }
475
476
477 static void tcp_v6_reqsk_destructor(struct request_sock *req)
478 {
479 kfree_skb(inet_rsk(req)->pktopts);
480 }
481
482 #ifdef CONFIG_TCP_MD5SIG
483 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
484 const struct in6_addr *addr)
485 {
486 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
487 }
488
489 static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
490 const struct sock *addr_sk)
491 {
492 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
493 }
494
495 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
496 int optlen)
497 {
498 struct tcp_md5sig cmd;
499 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
500
501 if (optlen < sizeof(cmd))
502 return -EINVAL;
503
504 if (copy_from_user(&cmd, optval, sizeof(cmd)))
505 return -EFAULT;
506
507 if (sin6->sin6_family != AF_INET6)
508 return -EINVAL;
509
510 if (!cmd.tcpm_keylen) {
511 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
512 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
513 AF_INET);
514 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
515 AF_INET6);
516 }
517
518 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
519 return -EINVAL;
520
521 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
522 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
523 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
524
525 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
526 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
527 }
528
529 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
530 const struct in6_addr *daddr,
531 const struct in6_addr *saddr, int nbytes)
532 {
533 struct tcp6_pseudohdr *bp;
534 struct scatterlist sg;
535
536 bp = &hp->md5_blk.ip6;
537 /* 1. TCP pseudo-header (RFC2460) */
538 bp->saddr = *saddr;
539 bp->daddr = *daddr;
540 bp->protocol = cpu_to_be32(IPPROTO_TCP);
541 bp->len = cpu_to_be32(nbytes);
542
543 sg_init_one(&sg, bp, sizeof(*bp));
544 ahash_request_set_crypt(hp->md5_req, &sg, NULL, sizeof(*bp));
545 return crypto_ahash_update(hp->md5_req);
546 }
547
548 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
549 const struct in6_addr *daddr, struct in6_addr *saddr,
550 const struct tcphdr *th)
551 {
552 struct tcp_md5sig_pool *hp;
553 struct ahash_request *req;
554
555 hp = tcp_get_md5sig_pool();
556 if (!hp)
557 goto clear_hash_noput;
558 req = hp->md5_req;
559
560 if (crypto_ahash_init(req))
561 goto clear_hash;
562 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
563 goto clear_hash;
564 if (tcp_md5_hash_header(hp, th))
565 goto clear_hash;
566 if (tcp_md5_hash_key(hp, key))
567 goto clear_hash;
568 ahash_request_set_crypt(req, NULL, md5_hash, 0);
569 if (crypto_ahash_final(req))
570 goto clear_hash;
571
572 tcp_put_md5sig_pool();
573 return 0;
574
575 clear_hash:
576 tcp_put_md5sig_pool();
577 clear_hash_noput:
578 memset(md5_hash, 0, 16);
579 return 1;
580 }
581
582 static int tcp_v6_md5_hash_skb(char *md5_hash,
583 const struct tcp_md5sig_key *key,
584 const struct sock *sk,
585 const struct sk_buff *skb)
586 {
587 const struct in6_addr *saddr, *daddr;
588 struct tcp_md5sig_pool *hp;
589 struct ahash_request *req;
590 const struct tcphdr *th = tcp_hdr(skb);
591
592 if (sk) { /* valid for establish/request sockets */
593 saddr = &sk->sk_v6_rcv_saddr;
594 daddr = &sk->sk_v6_daddr;
595 } else {
596 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
597 saddr = &ip6h->saddr;
598 daddr = &ip6h->daddr;
599 }
600
601 hp = tcp_get_md5sig_pool();
602 if (!hp)
603 goto clear_hash_noput;
604 req = hp->md5_req;
605
606 if (crypto_ahash_init(req))
607 goto clear_hash;
608
609 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
610 goto clear_hash;
611 if (tcp_md5_hash_header(hp, th))
612 goto clear_hash;
613 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
614 goto clear_hash;
615 if (tcp_md5_hash_key(hp, key))
616 goto clear_hash;
617 ahash_request_set_crypt(req, NULL, md5_hash, 0);
618 if (crypto_ahash_final(req))
619 goto clear_hash;
620
621 tcp_put_md5sig_pool();
622 return 0;
623
624 clear_hash:
625 tcp_put_md5sig_pool();
626 clear_hash_noput:
627 memset(md5_hash, 0, 16);
628 return 1;
629 }
630
631 #endif
632
633 static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
634 const struct sk_buff *skb)
635 {
636 #ifdef CONFIG_TCP_MD5SIG
637 const __u8 *hash_location = NULL;
638 struct tcp_md5sig_key *hash_expected;
639 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
640 const struct tcphdr *th = tcp_hdr(skb);
641 int genhash;
642 u8 newhash[16];
643
644 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
645 hash_location = tcp_parse_md5sig_option(th);
646
647 /* We've parsed the options - do we have a hash? */
648 if (!hash_expected && !hash_location)
649 return false;
650
651 if (hash_expected && !hash_location) {
652 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
653 return true;
654 }
655
656 if (!hash_expected && hash_location) {
657 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
658 return true;
659 }
660
661 /* check the signature */
662 genhash = tcp_v6_md5_hash_skb(newhash,
663 hash_expected,
664 NULL, skb);
665
666 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
667 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
668 genhash ? "failed" : "mismatch",
669 &ip6h->saddr, ntohs(th->source),
670 &ip6h->daddr, ntohs(th->dest));
671 return true;
672 }
673 #endif
674 return false;
675 }
676
677 static void tcp_v6_init_req(struct request_sock *req,
678 const struct sock *sk_listener,
679 struct sk_buff *skb)
680 {
681 struct inet_request_sock *ireq = inet_rsk(req);
682 const struct ipv6_pinfo *np = inet6_sk(sk_listener);
683
684 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
685 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
686
687 /* So that link locals have meaning */
688 if (!sk_listener->sk_bound_dev_if &&
689 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
690 ireq->ir_iif = tcp_v6_iif(skb);
691
692 if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
693 (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
694 np->rxopt.bits.rxinfo ||
695 np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
696 np->rxopt.bits.rxohlim || np->repflow)) {
697 atomic_inc(&skb->users);
698 ireq->pktopts = skb;
699 }
700 }
701
702 static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
703 struct flowi *fl,
704 const struct request_sock *req,
705 bool *strict)
706 {
707 if (strict)
708 *strict = true;
709 return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
710 }
711
712 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
713 .family = AF_INET6,
714 .obj_size = sizeof(struct tcp6_request_sock),
715 .rtx_syn_ack = tcp_rtx_synack,
716 .send_ack = tcp_v6_reqsk_send_ack,
717 .destructor = tcp_v6_reqsk_destructor,
718 .send_reset = tcp_v6_send_reset,
719 .syn_ack_timeout = tcp_syn_ack_timeout,
720 };
721
722 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
723 .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
724 sizeof(struct ipv6hdr),
725 #ifdef CONFIG_TCP_MD5SIG
726 .req_md5_lookup = tcp_v6_md5_lookup,
727 .calc_md5_hash = tcp_v6_md5_hash_skb,
728 #endif
729 .init_req = tcp_v6_init_req,
730 #ifdef CONFIG_SYN_COOKIES
731 .cookie_init_seq = cookie_v6_init_sequence,
732 #endif
733 .route_req = tcp_v6_route_req,
734 .init_seq = tcp_v6_init_sequence,
735 .send_synack = tcp_v6_send_synack,
736 };
737
738 static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
739 u32 ack, u32 win, u32 tsval, u32 tsecr,
740 int oif, struct tcp_md5sig_key *key, int rst,
741 u8 tclass, u32 label)
742 {
743 const struct tcphdr *th = tcp_hdr(skb);
744 struct tcphdr *t1;
745 struct sk_buff *buff;
746 struct flowi6 fl6;
747 struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
748 struct sock *ctl_sk = net->ipv6.tcp_sk;
749 unsigned int tot_len = sizeof(struct tcphdr);
750 struct dst_entry *dst;
751 __be32 *topt;
752
753 if (tsecr)
754 tot_len += TCPOLEN_TSTAMP_ALIGNED;
755 #ifdef CONFIG_TCP_MD5SIG
756 if (key)
757 tot_len += TCPOLEN_MD5SIG_ALIGNED;
758 #endif
759
760 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
761 GFP_ATOMIC);
762 if (!buff)
763 return;
764
765 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
766
767 t1 = (struct tcphdr *) skb_push(buff, tot_len);
768 skb_reset_transport_header(buff);
769
770 /* Swap the send and the receive. */
771 memset(t1, 0, sizeof(*t1));
772 t1->dest = th->source;
773 t1->source = th->dest;
774 t1->doff = tot_len / 4;
775 t1->seq = htonl(seq);
776 t1->ack_seq = htonl(ack);
777 t1->ack = !rst || !th->ack;
778 t1->rst = rst;
779 t1->window = htons(win);
780
781 topt = (__be32 *)(t1 + 1);
782
783 if (tsecr) {
784 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
785 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
786 *topt++ = htonl(tsval);
787 *topt++ = htonl(tsecr);
788 }
789
790 #ifdef CONFIG_TCP_MD5SIG
791 if (key) {
792 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
793 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
794 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
795 &ipv6_hdr(skb)->saddr,
796 &ipv6_hdr(skb)->daddr, t1);
797 }
798 #endif
799
800 memset(&fl6, 0, sizeof(fl6));
801 fl6.daddr = ipv6_hdr(skb)->saddr;
802 fl6.saddr = ipv6_hdr(skb)->daddr;
803 fl6.flowlabel = label;
804
805 buff->ip_summed = CHECKSUM_PARTIAL;
806 buff->csum = 0;
807
808 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
809
810 fl6.flowi6_proto = IPPROTO_TCP;
811 if (rt6_need_strict(&fl6.daddr) && !oif)
812 fl6.flowi6_oif = tcp_v6_iif(skb);
813 else
814 fl6.flowi6_oif = oif;
815 fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark);
816 fl6.fl6_dport = t1->dest;
817 fl6.fl6_sport = t1->source;
818 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
819
820 /* Pass a socket to ip6_dst_lookup either it is for RST
821 * Underlying function will use this to retrieve the network
822 * namespace
823 */
824 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
825 if (!IS_ERR(dst)) {
826 skb_dst_set(buff, dst);
827 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
828 __TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
829 if (rst)
830 __TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
831 return;
832 }
833
834 kfree_skb(buff);
835 }
836
837 static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
838 {
839 const struct tcphdr *th = tcp_hdr(skb);
840 u32 seq = 0, ack_seq = 0;
841 struct tcp_md5sig_key *key = NULL;
842 #ifdef CONFIG_TCP_MD5SIG
843 const __u8 *hash_location = NULL;
844 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
845 unsigned char newhash[16];
846 int genhash;
847 struct sock *sk1 = NULL;
848 #endif
849 int oif;
850
851 if (th->rst)
852 return;
853
854 /* If sk not NULL, it means we did a successful lookup and incoming
855 * route had to be correct. prequeue might have dropped our dst.
856 */
857 if (!sk && !ipv6_unicast_destination(skb))
858 return;
859
860 #ifdef CONFIG_TCP_MD5SIG
861 rcu_read_lock();
862 hash_location = tcp_parse_md5sig_option(th);
863 if (sk && sk_fullsock(sk)) {
864 key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
865 } else if (hash_location) {
866 /*
867 * active side is lost. Try to find listening socket through
868 * source port, and then find md5 key through listening socket.
869 * we are not loose security here:
870 * Incoming packet is checked with md5 hash with finding key,
871 * no RST generated if md5 hash doesn't match.
872 */
873 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
874 &tcp_hashinfo, NULL, 0,
875 &ipv6h->saddr,
876 th->source, &ipv6h->daddr,
877 ntohs(th->source), tcp_v6_iif(skb));
878 if (!sk1)
879 goto out;
880
881 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
882 if (!key)
883 goto out;
884
885 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
886 if (genhash || memcmp(hash_location, newhash, 16) != 0)
887 goto out;
888 }
889 #endif
890
891 if (th->ack)
892 seq = ntohl(th->ack_seq);
893 else
894 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
895 (th->doff << 2);
896
897 oif = sk ? sk->sk_bound_dev_if : 0;
898 tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
899
900 #ifdef CONFIG_TCP_MD5SIG
901 out:
902 rcu_read_unlock();
903 #endif
904 }
905
906 static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
907 u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
908 struct tcp_md5sig_key *key, u8 tclass,
909 u32 label)
910 {
911 tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
912 tclass, label);
913 }
914
915 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
916 {
917 struct inet_timewait_sock *tw = inet_twsk(sk);
918 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
919
920 tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
921 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
922 tcp_time_stamp + tcptw->tw_ts_offset,
923 tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
924 tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel));
925
926 inet_twsk_put(tw);
927 }
928
929 static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
930 struct request_sock *req)
931 {
932 /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
933 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
934 */
935 tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
936 tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
937 tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd,
938 tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if,
939 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
940 0, 0);
941 }
942
943
944 static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
945 {
946 #ifdef CONFIG_SYN_COOKIES
947 const struct tcphdr *th = tcp_hdr(skb);
948
949 if (!th->syn)
950 sk = cookie_v6_check(sk, skb);
951 #endif
952 return sk;
953 }
954
955 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
956 {
957 if (skb->protocol == htons(ETH_P_IP))
958 return tcp_v4_conn_request(sk, skb);
959
960 if (!ipv6_unicast_destination(skb))
961 goto drop;
962
963 return tcp_conn_request(&tcp6_request_sock_ops,
964 &tcp_request_sock_ipv6_ops, sk, skb);
965
966 drop:
967 tcp_listendrop(sk);
968 return 0; /* don't send reset */
969 }
970
971 static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
972 struct request_sock *req,
973 struct dst_entry *dst,
974 struct request_sock *req_unhash,
975 bool *own_req)
976 {
977 struct inet_request_sock *ireq;
978 struct ipv6_pinfo *newnp;
979 const struct ipv6_pinfo *np = inet6_sk(sk);
980 struct ipv6_txoptions *opt;
981 struct tcp6_sock *newtcp6sk;
982 struct inet_sock *newinet;
983 struct tcp_sock *newtp;
984 struct sock *newsk;
985 #ifdef CONFIG_TCP_MD5SIG
986 struct tcp_md5sig_key *key;
987 #endif
988 struct flowi6 fl6;
989
990 if (skb->protocol == htons(ETH_P_IP)) {
991 /*
992 * v6 mapped
993 */
994
995 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst,
996 req_unhash, own_req);
997
998 if (!newsk)
999 return NULL;
1000
1001 newtcp6sk = (struct tcp6_sock *)newsk;
1002 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1003
1004 newinet = inet_sk(newsk);
1005 newnp = inet6_sk(newsk);
1006 newtp = tcp_sk(newsk);
1007
1008 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1009
1010 newnp->saddr = newsk->sk_v6_rcv_saddr;
1011
1012 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1013 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1014 #ifdef CONFIG_TCP_MD5SIG
1015 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1016 #endif
1017
1018 newnp->ipv6_ac_list = NULL;
1019 newnp->ipv6_fl_list = NULL;
1020 newnp->pktoptions = NULL;
1021 newnp->opt = NULL;
1022 newnp->mcast_oif = tcp_v6_iif(skb);
1023 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1024 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1025 if (np->repflow)
1026 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1027
1028 /*
1029 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1030 * here, tcp_create_openreq_child now does this for us, see the comment in
1031 * that function for the gory details. -acme
1032 */
1033
1034 /* It is tricky place. Until this moment IPv4 tcp
1035 worked with IPv6 icsk.icsk_af_ops.
1036 Sync it now.
1037 */
1038 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1039
1040 return newsk;
1041 }
1042
1043 ireq = inet_rsk(req);
1044
1045 if (sk_acceptq_is_full(sk))
1046 goto out_overflow;
1047
1048 if (!dst) {
1049 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
1050 if (!dst)
1051 goto out;
1052 }
1053
1054 newsk = tcp_create_openreq_child(sk, req, skb);
1055 if (!newsk)
1056 goto out_nonewsk;
1057
1058 /*
1059 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1060 * count here, tcp_create_openreq_child now does this for us, see the
1061 * comment in that function for the gory details. -acme
1062 */
1063
1064 newsk->sk_gso_type = SKB_GSO_TCPV6;
1065 ip6_dst_store(newsk, dst, NULL, NULL);
1066 inet6_sk_rx_dst_set(newsk, skb);
1067
1068 newtcp6sk = (struct tcp6_sock *)newsk;
1069 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1070
1071 newtp = tcp_sk(newsk);
1072 newinet = inet_sk(newsk);
1073 newnp = inet6_sk(newsk);
1074
1075 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1076
1077 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1078 newnp->saddr = ireq->ir_v6_loc_addr;
1079 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1080 newsk->sk_bound_dev_if = ireq->ir_iif;
1081
1082 /* Now IPv6 options...
1083
1084 First: no IPv4 options.
1085 */
1086 newinet->inet_opt = NULL;
1087 newnp->ipv6_ac_list = NULL;
1088 newnp->ipv6_fl_list = NULL;
1089
1090 /* Clone RX bits */
1091 newnp->rxopt.all = np->rxopt.all;
1092
1093 newnp->pktoptions = NULL;
1094 newnp->opt = NULL;
1095 newnp->mcast_oif = tcp_v6_iif(skb);
1096 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1097 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1098 if (np->repflow)
1099 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1100
1101 /* Clone native IPv6 options from listening socket (if any)
1102
1103 Yes, keeping reference count would be much more clever,
1104 but we make one more one thing there: reattach optmem
1105 to newsk.
1106 */
1107 opt = rcu_dereference(np->opt);
1108 if (opt) {
1109 opt = ipv6_dup_options(newsk, opt);
1110 RCU_INIT_POINTER(newnp->opt, opt);
1111 }
1112 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1113 if (opt)
1114 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
1115 opt->opt_flen;
1116
1117 tcp_ca_openreq_child(newsk, dst);
1118
1119 tcp_sync_mss(newsk, dst_mtu(dst));
1120 newtp->advmss = dst_metric_advmss(dst);
1121 if (tcp_sk(sk)->rx_opt.user_mss &&
1122 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1123 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1124
1125 tcp_initialize_rcv_mss(newsk);
1126
1127 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1128 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1129
1130 #ifdef CONFIG_TCP_MD5SIG
1131 /* Copy over the MD5 key from the original socket */
1132 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1133 if (key) {
1134 /* We're using one, so create a matching key
1135 * on the newsk structure. If we fail to get
1136 * memory, then we end up not copying the key
1137 * across. Shucks.
1138 */
1139 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1140 AF_INET6, key->key, key->keylen,
1141 sk_gfp_mask(sk, GFP_ATOMIC));
1142 }
1143 #endif
1144
1145 if (__inet_inherit_port(sk, newsk) < 0) {
1146 inet_csk_prepare_forced_close(newsk);
1147 tcp_done(newsk);
1148 goto out;
1149 }
1150 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
1151 if (*own_req) {
1152 tcp_move_syn(newtp, req);
1153
1154 /* Clone pktoptions received with SYN, if we own the req */
1155 if (ireq->pktopts) {
1156 newnp->pktoptions = skb_clone(ireq->pktopts,
1157 sk_gfp_mask(sk, GFP_ATOMIC));
1158 consume_skb(ireq->pktopts);
1159 ireq->pktopts = NULL;
1160 if (newnp->pktoptions)
1161 skb_set_owner_r(newnp->pktoptions, newsk);
1162 }
1163 }
1164
1165 return newsk;
1166
1167 out_overflow:
1168 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1169 out_nonewsk:
1170 dst_release(dst);
1171 out:
1172 tcp_listendrop(sk);
1173 return NULL;
1174 }
1175
1176 /* The socket must have it's spinlock held when we get
1177 * here, unless it is a TCP_LISTEN socket.
1178 *
1179 * We have a potential double-lock case here, so even when
1180 * doing backlog processing we use the BH locking scheme.
1181 * This is because we cannot sleep with the original spinlock
1182 * held.
1183 */
1184 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1185 {
1186 struct ipv6_pinfo *np = inet6_sk(sk);
1187 struct tcp_sock *tp;
1188 struct sk_buff *opt_skb = NULL;
1189
1190 /* Imagine: socket is IPv6. IPv4 packet arrives,
1191 goes to IPv4 receive handler and backlogged.
1192 From backlog it always goes here. Kerboom...
1193 Fortunately, tcp_rcv_established and rcv_established
1194 handle them correctly, but it is not case with
1195 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1196 */
1197
1198 if (skb->protocol == htons(ETH_P_IP))
1199 return tcp_v4_do_rcv(sk, skb);
1200
1201 if (sk_filter(sk, skb))
1202 goto discard;
1203
1204 /*
1205 * socket locking is here for SMP purposes as backlog rcv
1206 * is currently called with bh processing disabled.
1207 */
1208
1209 /* Do Stevens' IPV6_PKTOPTIONS.
1210
1211 Yes, guys, it is the only place in our code, where we
1212 may make it not affecting IPv4.
1213 The rest of code is protocol independent,
1214 and I do not like idea to uglify IPv4.
1215
1216 Actually, all the idea behind IPV6_PKTOPTIONS
1217 looks not very well thought. For now we latch
1218 options, received in the last packet, enqueued
1219 by tcp. Feel free to propose better solution.
1220 --ANK (980728)
1221 */
1222 if (np->rxopt.all)
1223 opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
1224
1225 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1226 struct dst_entry *dst = sk->sk_rx_dst;
1227
1228 sock_rps_save_rxhash(sk, skb);
1229 sk_mark_napi_id(sk, skb);
1230 if (dst) {
1231 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1232 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1233 dst_release(dst);
1234 sk->sk_rx_dst = NULL;
1235 }
1236 }
1237
1238 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1239 if (opt_skb)
1240 goto ipv6_pktoptions;
1241 return 0;
1242 }
1243
1244 if (tcp_checksum_complete(skb))
1245 goto csum_err;
1246
1247 if (sk->sk_state == TCP_LISTEN) {
1248 struct sock *nsk = tcp_v6_cookie_check(sk, skb);
1249
1250 if (!nsk)
1251 goto discard;
1252
1253 if (nsk != sk) {
1254 sock_rps_save_rxhash(nsk, skb);
1255 sk_mark_napi_id(nsk, skb);
1256 if (tcp_child_process(sk, nsk, skb))
1257 goto reset;
1258 if (opt_skb)
1259 __kfree_skb(opt_skb);
1260 return 0;
1261 }
1262 } else
1263 sock_rps_save_rxhash(sk, skb);
1264
1265 if (tcp_rcv_state_process(sk, skb))
1266 goto reset;
1267 if (opt_skb)
1268 goto ipv6_pktoptions;
1269 return 0;
1270
1271 reset:
1272 tcp_v6_send_reset(sk, skb);
1273 discard:
1274 if (opt_skb)
1275 __kfree_skb(opt_skb);
1276 kfree_skb(skb);
1277 return 0;
1278 csum_err:
1279 __TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
1280 __TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
1281 goto discard;
1282
1283
1284 ipv6_pktoptions:
1285 /* Do you ask, what is it?
1286
1287 1. skb was enqueued by tcp.
1288 2. skb is added to tail of read queue, rather than out of order.
1289 3. socket is not in passive state.
1290 4. Finally, it really contains options, which user wants to receive.
1291 */
1292 tp = tcp_sk(sk);
1293 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1294 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1295 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1296 np->mcast_oif = tcp_v6_iif(opt_skb);
1297 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1298 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1299 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
1300 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
1301 if (np->repflow)
1302 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
1303 if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
1304 skb_set_owner_r(opt_skb, sk);
1305 opt_skb = xchg(&np->pktoptions, opt_skb);
1306 } else {
1307 __kfree_skb(opt_skb);
1308 opt_skb = xchg(&np->pktoptions, NULL);
1309 }
1310 }
1311
1312 kfree_skb(opt_skb);
1313 return 0;
1314 }
1315
1316 static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
1317 const struct tcphdr *th)
1318 {
1319 /* This is tricky: we move IP6CB at its correct location into
1320 * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
1321 * _decode_session6() uses IP6CB().
1322 * barrier() makes sure compiler won't play aliasing games.
1323 */
1324 memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
1325 sizeof(struct inet6_skb_parm));
1326 barrier();
1327
1328 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1329 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1330 skb->len - th->doff*4);
1331 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1332 TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
1333 TCP_SKB_CB(skb)->tcp_tw_isn = 0;
1334 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1335 TCP_SKB_CB(skb)->sacked = 0;
1336 }
1337
1338 static void tcp_v6_restore_cb(struct sk_buff *skb)
1339 {
1340 /* We need to move header back to the beginning if xfrm6_policy_check()
1341 * and tcp_v6_fill_cb() are going to be called again.
1342 */
1343 memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
1344 sizeof(struct inet6_skb_parm));
1345 }
1346
1347 static int tcp_v6_rcv(struct sk_buff *skb)
1348 {
1349 const struct tcphdr *th;
1350 const struct ipv6hdr *hdr;
1351 bool refcounted;
1352 struct sock *sk;
1353 int ret;
1354 struct net *net = dev_net(skb->dev);
1355
1356 if (skb->pkt_type != PACKET_HOST)
1357 goto discard_it;
1358
1359 /*
1360 * Count it even if it's bad.
1361 */
1362 __TCP_INC_STATS(net, TCP_MIB_INSEGS);
1363
1364 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1365 goto discard_it;
1366
1367 th = tcp_hdr(skb);
1368
1369 if (th->doff < sizeof(struct tcphdr)/4)
1370 goto bad_packet;
1371 if (!pskb_may_pull(skb, th->doff*4))
1372 goto discard_it;
1373
1374 if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
1375 goto csum_error;
1376
1377 th = tcp_hdr(skb);
1378 hdr = ipv6_hdr(skb);
1379
1380 lookup:
1381 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th),
1382 th->source, th->dest, inet6_iif(skb),
1383 &refcounted);
1384 if (!sk)
1385 goto no_tcp_socket;
1386
1387 process:
1388 if (sk->sk_state == TCP_TIME_WAIT)
1389 goto do_time_wait;
1390
1391 if (sk->sk_state == TCP_NEW_SYN_RECV) {
1392 struct request_sock *req = inet_reqsk(sk);
1393 struct sock *nsk;
1394
1395 sk = req->rsk_listener;
1396 tcp_v6_fill_cb(skb, hdr, th);
1397 if (tcp_v6_inbound_md5_hash(sk, skb)) {
1398 reqsk_put(req);
1399 goto discard_it;
1400 }
1401 if (unlikely(sk->sk_state != TCP_LISTEN)) {
1402 inet_csk_reqsk_queue_drop_and_put(sk, req);
1403 goto lookup;
1404 }
1405 sock_hold(sk);
1406 refcounted = true;
1407 nsk = tcp_check_req(sk, skb, req, false);
1408 if (!nsk) {
1409 reqsk_put(req);
1410 goto discard_and_relse;
1411 }
1412 if (nsk == sk) {
1413 reqsk_put(req);
1414 tcp_v6_restore_cb(skb);
1415 } else if (tcp_child_process(sk, nsk, skb)) {
1416 tcp_v6_send_reset(nsk, skb);
1417 goto discard_and_relse;
1418 } else {
1419 sock_put(sk);
1420 return 0;
1421 }
1422 }
1423 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1424 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1425 goto discard_and_relse;
1426 }
1427
1428 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1429 goto discard_and_relse;
1430
1431 tcp_v6_fill_cb(skb, hdr, th);
1432
1433 if (tcp_v6_inbound_md5_hash(sk, skb))
1434 goto discard_and_relse;
1435
1436 if (sk_filter(sk, skb))
1437 goto discard_and_relse;
1438
1439 skb->dev = NULL;
1440
1441 if (sk->sk_state == TCP_LISTEN) {
1442 ret = tcp_v6_do_rcv(sk, skb);
1443 goto put_and_return;
1444 }
1445
1446 sk_incoming_cpu_update(sk);
1447
1448 bh_lock_sock_nested(sk);
1449 tcp_segs_in(tcp_sk(sk), skb);
1450 ret = 0;
1451 if (!sock_owned_by_user(sk)) {
1452 if (!tcp_prequeue(sk, skb))
1453 ret = tcp_v6_do_rcv(sk, skb);
1454 } else if (unlikely(sk_add_backlog(sk, skb,
1455 sk->sk_rcvbuf + sk->sk_sndbuf))) {
1456 bh_unlock_sock(sk);
1457 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1458 goto discard_and_relse;
1459 }
1460 bh_unlock_sock(sk);
1461
1462 put_and_return:
1463 if (refcounted)
1464 sock_put(sk);
1465 return ret ? -1 : 0;
1466
1467 no_tcp_socket:
1468 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1469 goto discard_it;
1470
1471 tcp_v6_fill_cb(skb, hdr, th);
1472
1473 if (tcp_checksum_complete(skb)) {
1474 csum_error:
1475 __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS);
1476 bad_packet:
1477 __TCP_INC_STATS(net, TCP_MIB_INERRS);
1478 } else {
1479 tcp_v6_send_reset(NULL, skb);
1480 }
1481
1482 discard_it:
1483 kfree_skb(skb);
1484 return 0;
1485
1486 discard_and_relse:
1487 sk_drops_add(sk, skb);
1488 if (refcounted)
1489 sock_put(sk);
1490 goto discard_it;
1491
1492 do_time_wait:
1493 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1494 inet_twsk_put(inet_twsk(sk));
1495 goto discard_it;
1496 }
1497
1498 tcp_v6_fill_cb(skb, hdr, th);
1499
1500 if (tcp_checksum_complete(skb)) {
1501 inet_twsk_put(inet_twsk(sk));
1502 goto csum_error;
1503 }
1504
1505 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1506 case TCP_TW_SYN:
1507 {
1508 struct sock *sk2;
1509
1510 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1511 skb, __tcp_hdrlen(th),
1512 &ipv6_hdr(skb)->saddr, th->source,
1513 &ipv6_hdr(skb)->daddr,
1514 ntohs(th->dest), tcp_v6_iif(skb));
1515 if (sk2) {
1516 struct inet_timewait_sock *tw = inet_twsk(sk);
1517 inet_twsk_deschedule_put(tw);
1518 sk = sk2;
1519 tcp_v6_restore_cb(skb);
1520 refcounted = false;
1521 goto process;
1522 }
1523 /* Fall through to ACK */
1524 }
1525 case TCP_TW_ACK:
1526 tcp_v6_timewait_ack(sk, skb);
1527 break;
1528 case TCP_TW_RST:
1529 tcp_v6_restore_cb(skb);
1530 tcp_v6_send_reset(sk, skb);
1531 inet_twsk_deschedule_put(inet_twsk(sk));
1532 goto discard_it;
1533 case TCP_TW_SUCCESS:
1534 ;
1535 }
1536 goto discard_it;
1537 }
1538
1539 static void tcp_v6_early_demux(struct sk_buff *skb)
1540 {
1541 const struct ipv6hdr *hdr;
1542 const struct tcphdr *th;
1543 struct sock *sk;
1544
1545 if (skb->pkt_type != PACKET_HOST)
1546 return;
1547
1548 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1549 return;
1550
1551 hdr = ipv6_hdr(skb);
1552 th = tcp_hdr(skb);
1553
1554 if (th->doff < sizeof(struct tcphdr) / 4)
1555 return;
1556
1557 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
1558 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1559 &hdr->saddr, th->source,
1560 &hdr->daddr, ntohs(th->dest),
1561 inet6_iif(skb));
1562 if (sk) {
1563 skb->sk = sk;
1564 skb->destructor = sock_edemux;
1565 if (sk_fullsock(sk)) {
1566 struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
1567
1568 if (dst)
1569 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1570 if (dst &&
1571 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1572 skb_dst_set_noref(skb, dst);
1573 }
1574 }
1575 }
1576
1577 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1578 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1579 .twsk_unique = tcp_twsk_unique,
1580 .twsk_destructor = tcp_twsk_destructor,
1581 };
1582
1583 static const struct inet_connection_sock_af_ops ipv6_specific = {
1584 .queue_xmit = inet6_csk_xmit,
1585 .send_check = tcp_v6_send_check,
1586 .rebuild_header = inet6_sk_rebuild_header,
1587 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1588 .conn_request = tcp_v6_conn_request,
1589 .syn_recv_sock = tcp_v6_syn_recv_sock,
1590 .net_header_len = sizeof(struct ipv6hdr),
1591 .net_frag_header_len = sizeof(struct frag_hdr),
1592 .setsockopt = ipv6_setsockopt,
1593 .getsockopt = ipv6_getsockopt,
1594 .addr2sockaddr = inet6_csk_addr2sockaddr,
1595 .sockaddr_len = sizeof(struct sockaddr_in6),
1596 .bind_conflict = inet6_csk_bind_conflict,
1597 #ifdef CONFIG_COMPAT
1598 .compat_setsockopt = compat_ipv6_setsockopt,
1599 .compat_getsockopt = compat_ipv6_getsockopt,
1600 #endif
1601 .mtu_reduced = tcp_v6_mtu_reduced,
1602 };
1603
1604 #ifdef CONFIG_TCP_MD5SIG
1605 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1606 .md5_lookup = tcp_v6_md5_lookup,
1607 .calc_md5_hash = tcp_v6_md5_hash_skb,
1608 .md5_parse = tcp_v6_parse_md5_keys,
1609 };
1610 #endif
1611
1612 /*
1613 * TCP over IPv4 via INET6 API
1614 */
1615 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1616 .queue_xmit = ip_queue_xmit,
1617 .send_check = tcp_v4_send_check,
1618 .rebuild_header = inet_sk_rebuild_header,
1619 .sk_rx_dst_set = inet_sk_rx_dst_set,
1620 .conn_request = tcp_v6_conn_request,
1621 .syn_recv_sock = tcp_v6_syn_recv_sock,
1622 .net_header_len = sizeof(struct iphdr),
1623 .setsockopt = ipv6_setsockopt,
1624 .getsockopt = ipv6_getsockopt,
1625 .addr2sockaddr = inet6_csk_addr2sockaddr,
1626 .sockaddr_len = sizeof(struct sockaddr_in6),
1627 .bind_conflict = inet6_csk_bind_conflict,
1628 #ifdef CONFIG_COMPAT
1629 .compat_setsockopt = compat_ipv6_setsockopt,
1630 .compat_getsockopt = compat_ipv6_getsockopt,
1631 #endif
1632 .mtu_reduced = tcp_v4_mtu_reduced,
1633 };
1634
1635 #ifdef CONFIG_TCP_MD5SIG
1636 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1637 .md5_lookup = tcp_v4_md5_lookup,
1638 .calc_md5_hash = tcp_v4_md5_hash_skb,
1639 .md5_parse = tcp_v6_parse_md5_keys,
1640 };
1641 #endif
1642
1643 /* NOTE: A lot of things set to zero explicitly by call to
1644 * sk_alloc() so need not be done here.
1645 */
1646 static int tcp_v6_init_sock(struct sock *sk)
1647 {
1648 struct inet_connection_sock *icsk = inet_csk(sk);
1649
1650 tcp_init_sock(sk);
1651
1652 icsk->icsk_af_ops = &ipv6_specific;
1653
1654 #ifdef CONFIG_TCP_MD5SIG
1655 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1656 #endif
1657
1658 return 0;
1659 }
1660
1661 static void tcp_v6_destroy_sock(struct sock *sk)
1662 {
1663 tcp_v4_destroy_sock(sk);
1664 inet6_destroy_sock(sk);
1665 }
1666
1667 #ifdef CONFIG_PROC_FS
1668 /* Proc filesystem TCPv6 sock list dumping. */
1669 static void get_openreq6(struct seq_file *seq,
1670 const struct request_sock *req, int i)
1671 {
1672 long ttd = req->rsk_timer.expires - jiffies;
1673 const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
1674 const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
1675
1676 if (ttd < 0)
1677 ttd = 0;
1678
1679 seq_printf(seq,
1680 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1681 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1682 i,
1683 src->s6_addr32[0], src->s6_addr32[1],
1684 src->s6_addr32[2], src->s6_addr32[3],
1685 inet_rsk(req)->ir_num,
1686 dest->s6_addr32[0], dest->s6_addr32[1],
1687 dest->s6_addr32[2], dest->s6_addr32[3],
1688 ntohs(inet_rsk(req)->ir_rmt_port),
1689 TCP_SYN_RECV,
1690 0, 0, /* could print option size, but that is af dependent. */
1691 1, /* timers active (only the expire timer) */
1692 jiffies_to_clock_t(ttd),
1693 req->num_timeout,
1694 from_kuid_munged(seq_user_ns(seq),
1695 sock_i_uid(req->rsk_listener)),
1696 0, /* non standard timer */
1697 0, /* open_requests have no inode */
1698 0, req);
1699 }
1700
1701 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1702 {
1703 const struct in6_addr *dest, *src;
1704 __u16 destp, srcp;
1705 int timer_active;
1706 unsigned long timer_expires;
1707 const struct inet_sock *inet = inet_sk(sp);
1708 const struct tcp_sock *tp = tcp_sk(sp);
1709 const struct inet_connection_sock *icsk = inet_csk(sp);
1710 const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq;
1711 int rx_queue;
1712 int state;
1713
1714 dest = &sp->sk_v6_daddr;
1715 src = &sp->sk_v6_rcv_saddr;
1716 destp = ntohs(inet->inet_dport);
1717 srcp = ntohs(inet->inet_sport);
1718
1719 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1720 timer_active = 1;
1721 timer_expires = icsk->icsk_timeout;
1722 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1723 timer_active = 4;
1724 timer_expires = icsk->icsk_timeout;
1725 } else if (timer_pending(&sp->sk_timer)) {
1726 timer_active = 2;
1727 timer_expires = sp->sk_timer.expires;
1728 } else {
1729 timer_active = 0;
1730 timer_expires = jiffies;
1731 }
1732
1733 state = sk_state_load(sp);
1734 if (state == TCP_LISTEN)
1735 rx_queue = sp->sk_ack_backlog;
1736 else
1737 /* Because we don't lock the socket,
1738 * we might find a transient negative value.
1739 */
1740 rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
1741
1742 seq_printf(seq,
1743 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1744 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
1745 i,
1746 src->s6_addr32[0], src->s6_addr32[1],
1747 src->s6_addr32[2], src->s6_addr32[3], srcp,
1748 dest->s6_addr32[0], dest->s6_addr32[1],
1749 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1750 state,
1751 tp->write_seq - tp->snd_una,
1752 rx_queue,
1753 timer_active,
1754 jiffies_delta_to_clock_t(timer_expires - jiffies),
1755 icsk->icsk_retransmits,
1756 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1757 icsk->icsk_probes_out,
1758 sock_i_ino(sp),
1759 atomic_read(&sp->sk_refcnt), sp,
1760 jiffies_to_clock_t(icsk->icsk_rto),
1761 jiffies_to_clock_t(icsk->icsk_ack.ato),
1762 (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
1763 tp->snd_cwnd,
1764 state == TCP_LISTEN ?
1765 fastopenq->max_qlen :
1766 (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
1767 );
1768 }
1769
1770 static void get_timewait6_sock(struct seq_file *seq,
1771 struct inet_timewait_sock *tw, int i)
1772 {
1773 long delta = tw->tw_timer.expires - jiffies;
1774 const struct in6_addr *dest, *src;
1775 __u16 destp, srcp;
1776
1777 dest = &tw->tw_v6_daddr;
1778 src = &tw->tw_v6_rcv_saddr;
1779 destp = ntohs(tw->tw_dport);
1780 srcp = ntohs(tw->tw_sport);
1781
1782 seq_printf(seq,
1783 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1784 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1785 i,
1786 src->s6_addr32[0], src->s6_addr32[1],
1787 src->s6_addr32[2], src->s6_addr32[3], srcp,
1788 dest->s6_addr32[0], dest->s6_addr32[1],
1789 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1790 tw->tw_substate, 0, 0,
1791 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1792 atomic_read(&tw->tw_refcnt), tw);
1793 }
1794
1795 static int tcp6_seq_show(struct seq_file *seq, void *v)
1796 {
1797 struct tcp_iter_state *st;
1798 struct sock *sk = v;
1799
1800 if (v == SEQ_START_TOKEN) {
1801 seq_puts(seq,
1802 " sl "
1803 "local_address "
1804 "remote_address "
1805 "st tx_queue rx_queue tr tm->when retrnsmt"
1806 " uid timeout inode\n");
1807 goto out;
1808 }
1809 st = seq->private;
1810
1811 if (sk->sk_state == TCP_TIME_WAIT)
1812 get_timewait6_sock(seq, v, st->num);
1813 else if (sk->sk_state == TCP_NEW_SYN_RECV)
1814 get_openreq6(seq, v, st->num);
1815 else
1816 get_tcp6_sock(seq, v, st->num);
1817 out:
1818 return 0;
1819 }
1820
1821 static const struct file_operations tcp6_afinfo_seq_fops = {
1822 .owner = THIS_MODULE,
1823 .open = tcp_seq_open,
1824 .read = seq_read,
1825 .llseek = seq_lseek,
1826 .release = seq_release_net
1827 };
1828
1829 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1830 .name = "tcp6",
1831 .family = AF_INET6,
1832 .seq_fops = &tcp6_afinfo_seq_fops,
1833 .seq_ops = {
1834 .show = tcp6_seq_show,
1835 },
1836 };
1837
1838 int __net_init tcp6_proc_init(struct net *net)
1839 {
1840 return tcp_proc_register(net, &tcp6_seq_afinfo);
1841 }
1842
1843 void tcp6_proc_exit(struct net *net)
1844 {
1845 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1846 }
1847 #endif
1848
1849 static void tcp_v6_clear_sk(struct sock *sk, int size)
1850 {
1851 struct inet_sock *inet = inet_sk(sk);
1852
1853 /* we do not want to clear pinet6 field, because of RCU lookups */
1854 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6));
1855
1856 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1857 memset(&inet->pinet6 + 1, 0, size);
1858 }
1859
1860 struct proto tcpv6_prot = {
1861 .name = "TCPv6",
1862 .owner = THIS_MODULE,
1863 .close = tcp_close,
1864 .connect = tcp_v6_connect,
1865 .disconnect = tcp_disconnect,
1866 .accept = inet_csk_accept,
1867 .ioctl = tcp_ioctl,
1868 .init = tcp_v6_init_sock,
1869 .destroy = tcp_v6_destroy_sock,
1870 .shutdown = tcp_shutdown,
1871 .setsockopt = tcp_setsockopt,
1872 .getsockopt = tcp_getsockopt,
1873 .recvmsg = tcp_recvmsg,
1874 .sendmsg = tcp_sendmsg,
1875 .sendpage = tcp_sendpage,
1876 .backlog_rcv = tcp_v6_do_rcv,
1877 .release_cb = tcp_release_cb,
1878 .hash = inet6_hash,
1879 .unhash = inet_unhash,
1880 .get_port = inet_csk_get_port,
1881 .enter_memory_pressure = tcp_enter_memory_pressure,
1882 .stream_memory_free = tcp_stream_memory_free,
1883 .sockets_allocated = &tcp_sockets_allocated,
1884 .memory_allocated = &tcp_memory_allocated,
1885 .memory_pressure = &tcp_memory_pressure,
1886 .orphan_count = &tcp_orphan_count,
1887 .sysctl_mem = sysctl_tcp_mem,
1888 .sysctl_wmem = sysctl_tcp_wmem,
1889 .sysctl_rmem = sysctl_tcp_rmem,
1890 .max_header = MAX_TCP_HEADER,
1891 .obj_size = sizeof(struct tcp6_sock),
1892 .slab_flags = SLAB_DESTROY_BY_RCU,
1893 .twsk_prot = &tcp6_timewait_sock_ops,
1894 .rsk_prot = &tcp6_request_sock_ops,
1895 .h.hashinfo = &tcp_hashinfo,
1896 .no_autobind = true,
1897 #ifdef CONFIG_COMPAT
1898 .compat_setsockopt = compat_tcp_setsockopt,
1899 .compat_getsockopt = compat_tcp_getsockopt,
1900 #endif
1901 .clear_sk = tcp_v6_clear_sk,
1902 .diag_destroy = tcp_abort,
1903 };
1904
1905 static const struct inet6_protocol tcpv6_protocol = {
1906 .early_demux = tcp_v6_early_demux,
1907 .handler = tcp_v6_rcv,
1908 .err_handler = tcp_v6_err,
1909 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1910 };
1911
1912 static struct inet_protosw tcpv6_protosw = {
1913 .type = SOCK_STREAM,
1914 .protocol = IPPROTO_TCP,
1915 .prot = &tcpv6_prot,
1916 .ops = &inet6_stream_ops,
1917 .flags = INET_PROTOSW_PERMANENT |
1918 INET_PROTOSW_ICSK,
1919 };
1920
1921 static int __net_init tcpv6_net_init(struct net *net)
1922 {
1923 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1924 SOCK_RAW, IPPROTO_TCP, net);
1925 }
1926
1927 static void __net_exit tcpv6_net_exit(struct net *net)
1928 {
1929 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1930 }
1931
1932 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1933 {
1934 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1935 }
1936
1937 static struct pernet_operations tcpv6_net_ops = {
1938 .init = tcpv6_net_init,
1939 .exit = tcpv6_net_exit,
1940 .exit_batch = tcpv6_net_exit_batch,
1941 };
1942
1943 int __init tcpv6_init(void)
1944 {
1945 int ret;
1946
1947 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1948 if (ret)
1949 goto out;
1950
1951 /* register inet6 protocol */
1952 ret = inet6_register_protosw(&tcpv6_protosw);
1953 if (ret)
1954 goto out_tcpv6_protocol;
1955
1956 ret = register_pernet_subsys(&tcpv6_net_ops);
1957 if (ret)
1958 goto out_tcpv6_protosw;
1959 out:
1960 return ret;
1961
1962 out_tcpv6_protosw:
1963 inet6_unregister_protosw(&tcpv6_protosw);
1964 out_tcpv6_protocol:
1965 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1966 goto out;
1967 }
1968
1969 void tcpv6_exit(void)
1970 {
1971 unregister_pernet_subsys(&tcpv6_net_ops);
1972 inet6_unregister_protosw(&tcpv6_protosw);
1973 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1974 }
Linux kernel - Deliverables
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