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Merge remote-tracking branch 'spi/topic/core' into spi-next
[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 sk_buff *skb, u32 seq, u32 ack, u32 win,
791 u32 tsval, u32 tsecr, int oif,
792 struct tcp_md5sig_key *key, int rst, u8 tclass,
793 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 = 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(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 sk_buff *skb, u32 seq, u32 ack,
961 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(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass,
966 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(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(skb, (sk->sk_state == TCP_LISTEN) ?
990 tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
991 tcp_rsk(req)->rcv_nxt,
992 req->rcv_wnd, 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_sync_mss(newsk, dst_mtu(dst));
1203 newtp->advmss = dst_metric_advmss(dst);
1204 if (tcp_sk(sk)->rx_opt.user_mss &&
1205 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1206 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1207
1208 tcp_initialize_rcv_mss(newsk);
1209
1210 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1211 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1212
1213 #ifdef CONFIG_TCP_MD5SIG
1214 /* Copy over the MD5 key from the original socket */
1215 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1216 if (key != NULL) {
1217 /* We're using one, so create a matching key
1218 * on the newsk structure. If we fail to get
1219 * memory, then we end up not copying the key
1220 * across. Shucks.
1221 */
1222 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1223 AF_INET6, key->key, key->keylen,
1224 sk_gfp_atomic(sk, GFP_ATOMIC));
1225 }
1226 #endif
1227
1228 if (__inet_inherit_port(sk, newsk) < 0) {
1229 inet_csk_prepare_forced_close(newsk);
1230 tcp_done(newsk);
1231 goto out;
1232 }
1233 __inet6_hash(newsk, NULL);
1234
1235 return newsk;
1236
1237 out_overflow:
1238 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1239 out_nonewsk:
1240 dst_release(dst);
1241 out:
1242 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1243 return NULL;
1244 }
1245
1246 /* The socket must have it's spinlock held when we get
1247 * here.
1248 *
1249 * We have a potential double-lock case here, so even when
1250 * doing backlog processing we use the BH locking scheme.
1251 * This is because we cannot sleep with the original spinlock
1252 * held.
1253 */
1254 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1255 {
1256 struct ipv6_pinfo *np = inet6_sk(sk);
1257 struct tcp_sock *tp;
1258 struct sk_buff *opt_skb = NULL;
1259
1260 /* Imagine: socket is IPv6. IPv4 packet arrives,
1261 goes to IPv4 receive handler and backlogged.
1262 From backlog it always goes here. Kerboom...
1263 Fortunately, tcp_rcv_established and rcv_established
1264 handle them correctly, but it is not case with
1265 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1266 */
1267
1268 if (skb->protocol == htons(ETH_P_IP))
1269 return tcp_v4_do_rcv(sk, skb);
1270
1271 if (sk_filter(sk, skb))
1272 goto discard;
1273
1274 /*
1275 * socket locking is here for SMP purposes as backlog rcv
1276 * is currently called with bh processing disabled.
1277 */
1278
1279 /* Do Stevens' IPV6_PKTOPTIONS.
1280
1281 Yes, guys, it is the only place in our code, where we
1282 may make it not affecting IPv4.
1283 The rest of code is protocol independent,
1284 and I do not like idea to uglify IPv4.
1285
1286 Actually, all the idea behind IPV6_PKTOPTIONS
1287 looks not very well thought. For now we latch
1288 options, received in the last packet, enqueued
1289 by tcp. Feel free to propose better solution.
1290 --ANK (980728)
1291 */
1292 if (np->rxopt.all)
1293 opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
1294
1295 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1296 struct dst_entry *dst = sk->sk_rx_dst;
1297
1298 sock_rps_save_rxhash(sk, skb);
1299 if (dst) {
1300 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1301 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1302 dst_release(dst);
1303 sk->sk_rx_dst = NULL;
1304 }
1305 }
1306
1307 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1308 if (opt_skb)
1309 goto ipv6_pktoptions;
1310 return 0;
1311 }
1312
1313 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1314 goto csum_err;
1315
1316 if (sk->sk_state == TCP_LISTEN) {
1317 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1318 if (!nsk)
1319 goto discard;
1320
1321 /*
1322 * Queue it on the new socket if the new socket is active,
1323 * otherwise we just shortcircuit this and continue with
1324 * the new socket..
1325 */
1326 if (nsk != sk) {
1327 sock_rps_save_rxhash(nsk, skb);
1328 if (tcp_child_process(sk, nsk, skb))
1329 goto reset;
1330 if (opt_skb)
1331 __kfree_skb(opt_skb);
1332 return 0;
1333 }
1334 } else
1335 sock_rps_save_rxhash(sk, skb);
1336
1337 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1338 goto reset;
1339 if (opt_skb)
1340 goto ipv6_pktoptions;
1341 return 0;
1342
1343 reset:
1344 tcp_v6_send_reset(sk, skb);
1345 discard:
1346 if (opt_skb)
1347 __kfree_skb(opt_skb);
1348 kfree_skb(skb);
1349 return 0;
1350 csum_err:
1351 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
1352 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1353 goto discard;
1354
1355
1356 ipv6_pktoptions:
1357 /* Do you ask, what is it?
1358
1359 1. skb was enqueued by tcp.
1360 2. skb is added to tail of read queue, rather than out of order.
1361 3. socket is not in passive state.
1362 4. Finally, it really contains options, which user wants to receive.
1363 */
1364 tp = tcp_sk(sk);
1365 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1366 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1367 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1368 np->mcast_oif = tcp_v6_iif(opt_skb);
1369 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1370 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1371 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
1372 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
1373 if (np->repflow)
1374 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
1375 if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
1376 skb_set_owner_r(opt_skb, sk);
1377 opt_skb = xchg(&np->pktoptions, opt_skb);
1378 } else {
1379 __kfree_skb(opt_skb);
1380 opt_skb = xchg(&np->pktoptions, NULL);
1381 }
1382 }
1383
1384 kfree_skb(opt_skb);
1385 return 0;
1386 }
1387
1388 static int tcp_v6_rcv(struct sk_buff *skb)
1389 {
1390 const struct tcphdr *th;
1391 const struct ipv6hdr *hdr;
1392 struct sock *sk;
1393 int ret;
1394 struct net *net = dev_net(skb->dev);
1395
1396 if (skb->pkt_type != PACKET_HOST)
1397 goto discard_it;
1398
1399 /*
1400 * Count it even if it's bad.
1401 */
1402 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1403
1404 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1405 goto discard_it;
1406
1407 th = tcp_hdr(skb);
1408
1409 if (th->doff < sizeof(struct tcphdr)/4)
1410 goto bad_packet;
1411 if (!pskb_may_pull(skb, th->doff*4))
1412 goto discard_it;
1413
1414 if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
1415 goto csum_error;
1416
1417 th = tcp_hdr(skb);
1418 hdr = ipv6_hdr(skb);
1419 /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB()
1420 * barrier() makes sure compiler wont play fool^Waliasing games.
1421 */
1422 memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
1423 sizeof(struct inet6_skb_parm));
1424 barrier();
1425
1426 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1427 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1428 skb->len - th->doff*4);
1429 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1430 TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
1431 TCP_SKB_CB(skb)->tcp_tw_isn = 0;
1432 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1433 TCP_SKB_CB(skb)->sacked = 0;
1434
1435 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest,
1436 tcp_v6_iif(skb));
1437 if (!sk)
1438 goto no_tcp_socket;
1439
1440 process:
1441 if (sk->sk_state == TCP_TIME_WAIT)
1442 goto do_time_wait;
1443
1444 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1445 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1446 goto discard_and_relse;
1447 }
1448
1449 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1450 goto discard_and_relse;
1451
1452 #ifdef CONFIG_TCP_MD5SIG
1453 if (tcp_v6_inbound_md5_hash(sk, skb))
1454 goto discard_and_relse;
1455 #endif
1456
1457 if (sk_filter(sk, skb))
1458 goto discard_and_relse;
1459
1460 sk_mark_napi_id(sk, skb);
1461 skb->dev = NULL;
1462
1463 bh_lock_sock_nested(sk);
1464 ret = 0;
1465 if (!sock_owned_by_user(sk)) {
1466 if (!tcp_prequeue(sk, skb))
1467 ret = tcp_v6_do_rcv(sk, skb);
1468 } else if (unlikely(sk_add_backlog(sk, skb,
1469 sk->sk_rcvbuf + sk->sk_sndbuf))) {
1470 bh_unlock_sock(sk);
1471 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1472 goto discard_and_relse;
1473 }
1474 bh_unlock_sock(sk);
1475
1476 sock_put(sk);
1477 return ret ? -1 : 0;
1478
1479 no_tcp_socket:
1480 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1481 goto discard_it;
1482
1483 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1484 csum_error:
1485 TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
1486 bad_packet:
1487 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1488 } else {
1489 tcp_v6_send_reset(NULL, skb);
1490 }
1491
1492 discard_it:
1493 kfree_skb(skb);
1494 return 0;
1495
1496 discard_and_relse:
1497 sock_put(sk);
1498 goto discard_it;
1499
1500 do_time_wait:
1501 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1502 inet_twsk_put(inet_twsk(sk));
1503 goto discard_it;
1504 }
1505
1506 if (skb->len < (th->doff<<2)) {
1507 inet_twsk_put(inet_twsk(sk));
1508 goto bad_packet;
1509 }
1510 if (tcp_checksum_complete(skb)) {
1511 inet_twsk_put(inet_twsk(sk));
1512 goto csum_error;
1513 }
1514
1515 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1516 case TCP_TW_SYN:
1517 {
1518 struct sock *sk2;
1519
1520 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1521 &ipv6_hdr(skb)->saddr, th->source,
1522 &ipv6_hdr(skb)->daddr,
1523 ntohs(th->dest), tcp_v6_iif(skb));
1524 if (sk2 != NULL) {
1525 struct inet_timewait_sock *tw = inet_twsk(sk);
1526 inet_twsk_deschedule(tw, &tcp_death_row);
1527 inet_twsk_put(tw);
1528 sk = sk2;
1529 goto process;
1530 }
1531 /* Fall through to ACK */
1532 }
1533 case TCP_TW_ACK:
1534 tcp_v6_timewait_ack(sk, skb);
1535 break;
1536 case TCP_TW_RST:
1537 goto no_tcp_socket;
1538 case TCP_TW_SUCCESS:
1539 ;
1540 }
1541 goto discard_it;
1542 }
1543
1544 static void tcp_v6_early_demux(struct sk_buff *skb)
1545 {
1546 const struct ipv6hdr *hdr;
1547 const struct tcphdr *th;
1548 struct sock *sk;
1549
1550 if (skb->pkt_type != PACKET_HOST)
1551 return;
1552
1553 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1554 return;
1555
1556 hdr = ipv6_hdr(skb);
1557 th = tcp_hdr(skb);
1558
1559 if (th->doff < sizeof(struct tcphdr) / 4)
1560 return;
1561
1562 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
1563 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1564 &hdr->saddr, th->source,
1565 &hdr->daddr, ntohs(th->dest),
1566 inet6_iif(skb));
1567 if (sk) {
1568 skb->sk = sk;
1569 skb->destructor = sock_edemux;
1570 if (sk->sk_state != TCP_TIME_WAIT) {
1571 struct dst_entry *dst = sk->sk_rx_dst;
1572
1573 if (dst)
1574 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1575 if (dst &&
1576 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1577 skb_dst_set_noref(skb, dst);
1578 }
1579 }
1580 }
1581
1582 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1583 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1584 .twsk_unique = tcp_twsk_unique,
1585 .twsk_destructor = tcp_twsk_destructor,
1586 };
1587
1588 static const struct inet_connection_sock_af_ops ipv6_specific = {
1589 .queue_xmit = inet6_csk_xmit,
1590 .send_check = tcp_v6_send_check,
1591 .rebuild_header = inet6_sk_rebuild_header,
1592 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1593 .conn_request = tcp_v6_conn_request,
1594 .syn_recv_sock = tcp_v6_syn_recv_sock,
1595 .net_header_len = sizeof(struct ipv6hdr),
1596 .net_frag_header_len = sizeof(struct frag_hdr),
1597 .setsockopt = ipv6_setsockopt,
1598 .getsockopt = ipv6_getsockopt,
1599 .addr2sockaddr = inet6_csk_addr2sockaddr,
1600 .sockaddr_len = sizeof(struct sockaddr_in6),
1601 .bind_conflict = inet6_csk_bind_conflict,
1602 #ifdef CONFIG_COMPAT
1603 .compat_setsockopt = compat_ipv6_setsockopt,
1604 .compat_getsockopt = compat_ipv6_getsockopt,
1605 #endif
1606 .mtu_reduced = tcp_v6_mtu_reduced,
1607 };
1608
1609 #ifdef CONFIG_TCP_MD5SIG
1610 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1611 .md5_lookup = tcp_v6_md5_lookup,
1612 .calc_md5_hash = tcp_v6_md5_hash_skb,
1613 .md5_parse = tcp_v6_parse_md5_keys,
1614 };
1615 #endif
1616
1617 /*
1618 * TCP over IPv4 via INET6 API
1619 */
1620 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1621 .queue_xmit = ip_queue_xmit,
1622 .send_check = tcp_v4_send_check,
1623 .rebuild_header = inet_sk_rebuild_header,
1624 .sk_rx_dst_set = inet_sk_rx_dst_set,
1625 .conn_request = tcp_v6_conn_request,
1626 .syn_recv_sock = tcp_v6_syn_recv_sock,
1627 .net_header_len = sizeof(struct iphdr),
1628 .setsockopt = ipv6_setsockopt,
1629 .getsockopt = ipv6_getsockopt,
1630 .addr2sockaddr = inet6_csk_addr2sockaddr,
1631 .sockaddr_len = sizeof(struct sockaddr_in6),
1632 .bind_conflict = inet6_csk_bind_conflict,
1633 #ifdef CONFIG_COMPAT
1634 .compat_setsockopt = compat_ipv6_setsockopt,
1635 .compat_getsockopt = compat_ipv6_getsockopt,
1636 #endif
1637 .mtu_reduced = tcp_v4_mtu_reduced,
1638 };
1639
1640 #ifdef CONFIG_TCP_MD5SIG
1641 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1642 .md5_lookup = tcp_v4_md5_lookup,
1643 .calc_md5_hash = tcp_v4_md5_hash_skb,
1644 .md5_parse = tcp_v6_parse_md5_keys,
1645 };
1646 #endif
1647
1648 /* NOTE: A lot of things set to zero explicitly by call to
1649 * sk_alloc() so need not be done here.
1650 */
1651 static int tcp_v6_init_sock(struct sock *sk)
1652 {
1653 struct inet_connection_sock *icsk = inet_csk(sk);
1654
1655 tcp_init_sock(sk);
1656
1657 icsk->icsk_af_ops = &ipv6_specific;
1658
1659 #ifdef CONFIG_TCP_MD5SIG
1660 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1661 #endif
1662
1663 return 0;
1664 }
1665
1666 static void tcp_v6_destroy_sock(struct sock *sk)
1667 {
1668 tcp_v4_destroy_sock(sk);
1669 inet6_destroy_sock(sk);
1670 }
1671
1672 #ifdef CONFIG_PROC_FS
1673 /* Proc filesystem TCPv6 sock list dumping. */
1674 static void get_openreq6(struct seq_file *seq,
1675 const struct sock *sk, struct request_sock *req, int i, kuid_t uid)
1676 {
1677 int ttd = req->expires - jiffies;
1678 const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
1679 const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
1680
1681 if (ttd < 0)
1682 ttd = 0;
1683
1684 seq_printf(seq,
1685 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1686 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1687 i,
1688 src->s6_addr32[0], src->s6_addr32[1],
1689 src->s6_addr32[2], src->s6_addr32[3],
1690 inet_rsk(req)->ir_num,
1691 dest->s6_addr32[0], dest->s6_addr32[1],
1692 dest->s6_addr32[2], dest->s6_addr32[3],
1693 ntohs(inet_rsk(req)->ir_rmt_port),
1694 TCP_SYN_RECV,
1695 0, 0, /* could print option size, but that is af dependent. */
1696 1, /* timers active (only the expire timer) */
1697 jiffies_to_clock_t(ttd),
1698 req->num_timeout,
1699 from_kuid_munged(seq_user_ns(seq), uid),
1700 0, /* non standard timer */
1701 0, /* open_requests have no inode */
1702 0, req);
1703 }
1704
1705 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1706 {
1707 const struct in6_addr *dest, *src;
1708 __u16 destp, srcp;
1709 int timer_active;
1710 unsigned long timer_expires;
1711 const struct inet_sock *inet = inet_sk(sp);
1712 const struct tcp_sock *tp = tcp_sk(sp);
1713 const struct inet_connection_sock *icsk = inet_csk(sp);
1714 struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq;
1715
1716 dest = &sp->sk_v6_daddr;
1717 src = &sp->sk_v6_rcv_saddr;
1718 destp = ntohs(inet->inet_dport);
1719 srcp = ntohs(inet->inet_sport);
1720
1721 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1722 timer_active = 1;
1723 timer_expires = icsk->icsk_timeout;
1724 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1725 timer_active = 4;
1726 timer_expires = icsk->icsk_timeout;
1727 } else if (timer_pending(&sp->sk_timer)) {
1728 timer_active = 2;
1729 timer_expires = sp->sk_timer.expires;
1730 } else {
1731 timer_active = 0;
1732 timer_expires = jiffies;
1733 }
1734
1735 seq_printf(seq,
1736 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1737 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n",
1738 i,
1739 src->s6_addr32[0], src->s6_addr32[1],
1740 src->s6_addr32[2], src->s6_addr32[3], srcp,
1741 dest->s6_addr32[0], dest->s6_addr32[1],
1742 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1743 sp->sk_state,
1744 tp->write_seq-tp->snd_una,
1745 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1746 timer_active,
1747 jiffies_delta_to_clock_t(timer_expires - jiffies),
1748 icsk->icsk_retransmits,
1749 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1750 icsk->icsk_probes_out,
1751 sock_i_ino(sp),
1752 atomic_read(&sp->sk_refcnt), sp,
1753 jiffies_to_clock_t(icsk->icsk_rto),
1754 jiffies_to_clock_t(icsk->icsk_ack.ato),
1755 (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
1756 tp->snd_cwnd,
1757 sp->sk_state == TCP_LISTEN ?
1758 (fastopenq ? fastopenq->max_qlen : 0) :
1759 (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
1760 );
1761 }
1762
1763 static void get_timewait6_sock(struct seq_file *seq,
1764 struct inet_timewait_sock *tw, int i)
1765 {
1766 const struct in6_addr *dest, *src;
1767 __u16 destp, srcp;
1768 s32 delta = tw->tw_ttd - inet_tw_time_stamp();
1769
1770 dest = &tw->tw_v6_daddr;
1771 src = &tw->tw_v6_rcv_saddr;
1772 destp = ntohs(tw->tw_dport);
1773 srcp = ntohs(tw->tw_sport);
1774
1775 seq_printf(seq,
1776 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1777 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1778 i,
1779 src->s6_addr32[0], src->s6_addr32[1],
1780 src->s6_addr32[2], src->s6_addr32[3], srcp,
1781 dest->s6_addr32[0], dest->s6_addr32[1],
1782 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1783 tw->tw_substate, 0, 0,
1784 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1785 atomic_read(&tw->tw_refcnt), tw);
1786 }
1787
1788 static int tcp6_seq_show(struct seq_file *seq, void *v)
1789 {
1790 struct tcp_iter_state *st;
1791 struct sock *sk = v;
1792
1793 if (v == SEQ_START_TOKEN) {
1794 seq_puts(seq,
1795 " sl "
1796 "local_address "
1797 "remote_address "
1798 "st tx_queue rx_queue tr tm->when retrnsmt"
1799 " uid timeout inode\n");
1800 goto out;
1801 }
1802 st = seq->private;
1803
1804 switch (st->state) {
1805 case TCP_SEQ_STATE_LISTENING:
1806 case TCP_SEQ_STATE_ESTABLISHED:
1807 if (sk->sk_state == TCP_TIME_WAIT)
1808 get_timewait6_sock(seq, v, st->num);
1809 else
1810 get_tcp6_sock(seq, v, st->num);
1811 break;
1812 case TCP_SEQ_STATE_OPENREQ:
1813 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
1814 break;
1815 }
1816 out:
1817 return 0;
1818 }
1819
1820 static const struct file_operations tcp6_afinfo_seq_fops = {
1821 .owner = THIS_MODULE,
1822 .open = tcp_seq_open,
1823 .read = seq_read,
1824 .llseek = seq_lseek,
1825 .release = seq_release_net
1826 };
1827
1828 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1829 .name = "tcp6",
1830 .family = AF_INET6,
1831 .seq_fops = &tcp6_afinfo_seq_fops,
1832 .seq_ops = {
1833 .show = tcp6_seq_show,
1834 },
1835 };
1836
1837 int __net_init tcp6_proc_init(struct net *net)
1838 {
1839 return tcp_proc_register(net, &tcp6_seq_afinfo);
1840 }
1841
1842 void tcp6_proc_exit(struct net *net)
1843 {
1844 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1845 }
1846 #endif
1847
1848 static void tcp_v6_clear_sk(struct sock *sk, int size)
1849 {
1850 struct inet_sock *inet = inet_sk(sk);
1851
1852 /* we do not want to clear pinet6 field, because of RCU lookups */
1853 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6));
1854
1855 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1856 memset(&inet->pinet6 + 1, 0, size);
1857 }
1858
1859 struct proto tcpv6_prot = {
1860 .name = "TCPv6",
1861 .owner = THIS_MODULE,
1862 .close = tcp_close,
1863 .connect = tcp_v6_connect,
1864 .disconnect = tcp_disconnect,
1865 .accept = inet_csk_accept,
1866 .ioctl = tcp_ioctl,
1867 .init = tcp_v6_init_sock,
1868 .destroy = tcp_v6_destroy_sock,
1869 .shutdown = tcp_shutdown,
1870 .setsockopt = tcp_setsockopt,
1871 .getsockopt = tcp_getsockopt,
1872 .recvmsg = tcp_recvmsg,
1873 .sendmsg = tcp_sendmsg,
1874 .sendpage = tcp_sendpage,
1875 .backlog_rcv = tcp_v6_do_rcv,
1876 .release_cb = tcp_release_cb,
1877 .hash = tcp_v6_hash,
1878 .unhash = inet_unhash,
1879 .get_port = inet_csk_get_port,
1880 .enter_memory_pressure = tcp_enter_memory_pressure,
1881 .stream_memory_free = tcp_stream_memory_free,
1882 .sockets_allocated = &tcp_sockets_allocated,
1883 .memory_allocated = &tcp_memory_allocated,
1884 .memory_pressure = &tcp_memory_pressure,
1885 .orphan_count = &tcp_orphan_count,
1886 .sysctl_mem = sysctl_tcp_mem,
1887 .sysctl_wmem = sysctl_tcp_wmem,
1888 .sysctl_rmem = sysctl_tcp_rmem,
1889 .max_header = MAX_TCP_HEADER,
1890 .obj_size = sizeof(struct tcp6_sock),
1891 .slab_flags = SLAB_DESTROY_BY_RCU,
1892 .twsk_prot = &tcp6_timewait_sock_ops,
1893 .rsk_prot = &tcp6_request_sock_ops,
1894 .h.hashinfo = &tcp_hashinfo,
1895 .no_autobind = true,
1896 #ifdef CONFIG_COMPAT
1897 .compat_setsockopt = compat_tcp_setsockopt,
1898 .compat_getsockopt = compat_tcp_getsockopt,
1899 #endif
1900 #ifdef CONFIG_MEMCG_KMEM
1901 .proto_cgroup = tcp_proto_cgroup,
1902 #endif
1903 .clear_sk = tcp_v6_clear_sk,
1904 };
1905
1906 static const struct inet6_protocol tcpv6_protocol = {
1907 .early_demux = tcp_v6_early_demux,
1908 .handler = tcp_v6_rcv,
1909 .err_handler = tcp_v6_err,
1910 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1911 };
1912
1913 static struct inet_protosw tcpv6_protosw = {
1914 .type = SOCK_STREAM,
1915 .protocol = IPPROTO_TCP,
1916 .prot = &tcpv6_prot,
1917 .ops = &inet6_stream_ops,
1918 .flags = INET_PROTOSW_PERMANENT |
1919 INET_PROTOSW_ICSK,
1920 };
1921
1922 static int __net_init tcpv6_net_init(struct net *net)
1923 {
1924 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1925 SOCK_RAW, IPPROTO_TCP, net);
1926 }
1927
1928 static void __net_exit tcpv6_net_exit(struct net *net)
1929 {
1930 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1931 }
1932
1933 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1934 {
1935 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1936 }
1937
1938 static struct pernet_operations tcpv6_net_ops = {
1939 .init = tcpv6_net_init,
1940 .exit = tcpv6_net_exit,
1941 .exit_batch = tcpv6_net_exit_batch,
1942 };
1943
1944 int __init tcpv6_init(void)
1945 {
1946 int ret;
1947
1948 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1949 if (ret)
1950 goto out;
1951
1952 /* register inet6 protocol */
1953 ret = inet6_register_protosw(&tcpv6_protosw);
1954 if (ret)
1955 goto out_tcpv6_protocol;
1956
1957 ret = register_pernet_subsys(&tcpv6_net_ops);
1958 if (ret)
1959 goto out_tcpv6_protosw;
1960 out:
1961 return ret;
1962
1963 out_tcpv6_protosw:
1964 inet6_unregister_protosw(&tcpv6_protosw);
1965 out_tcpv6_protocol:
1966 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1967 goto out;
1968 }
1969
1970 void tcpv6_exit(void)
1971 {
1972 unregister_pernet_subsys(&tcpv6_net_ops);
1973 inet6_unregister_protosw(&tcpv6_protosw);
1974 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1975 }
Linux kernel - Deliverables
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