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UBUNTU: Ubuntu-raspi2-4.10.0-1011.14
[mirror_ubuntu-zesty-kernel.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, u32 *tsoff)
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, tsoff);
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 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
153 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
154 &usin->sin6_addr);
155 else
156 usin->sin6_addr = in6addr_loopback;
157 }
158
159 addr_type = ipv6_addr_type(&usin->sin6_addr);
160
161 if (addr_type & IPV6_ADDR_MULTICAST)
162 return -ENETUNREACH;
163
164 if (addr_type&IPV6_ADDR_LINKLOCAL) {
165 if (addr_len >= sizeof(struct sockaddr_in6) &&
166 usin->sin6_scope_id) {
167 /* If interface is set while binding, indices
168 * must coincide.
169 */
170 if (sk->sk_bound_dev_if &&
171 sk->sk_bound_dev_if != usin->sin6_scope_id)
172 return -EINVAL;
173
174 sk->sk_bound_dev_if = usin->sin6_scope_id;
175 }
176
177 /* Connect to link-local address requires an interface */
178 if (!sk->sk_bound_dev_if)
179 return -EINVAL;
180 }
181
182 if (tp->rx_opt.ts_recent_stamp &&
183 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
184 tp->rx_opt.ts_recent = 0;
185 tp->rx_opt.ts_recent_stamp = 0;
186 tp->write_seq = 0;
187 }
188
189 sk->sk_v6_daddr = usin->sin6_addr;
190 np->flow_label = fl6.flowlabel;
191
192 /*
193 * TCP over IPv4
194 */
195
196 if (addr_type & IPV6_ADDR_MAPPED) {
197 u32 exthdrlen = icsk->icsk_ext_hdr_len;
198 struct sockaddr_in sin;
199
200 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
201
202 if (__ipv6_only_sock(sk))
203 return -ENETUNREACH;
204
205 sin.sin_family = AF_INET;
206 sin.sin_port = usin->sin6_port;
207 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
208
209 icsk->icsk_af_ops = &ipv6_mapped;
210 sk->sk_backlog_rcv = tcp_v4_do_rcv;
211 #ifdef CONFIG_TCP_MD5SIG
212 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
213 #endif
214
215 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
216
217 if (err) {
218 icsk->icsk_ext_hdr_len = exthdrlen;
219 icsk->icsk_af_ops = &ipv6_specific;
220 sk->sk_backlog_rcv = tcp_v6_do_rcv;
221 #ifdef CONFIG_TCP_MD5SIG
222 tp->af_specific = &tcp_sock_ipv6_specific;
223 #endif
224 goto failure;
225 }
226 np->saddr = sk->sk_v6_rcv_saddr;
227
228 return err;
229 }
230
231 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
232 saddr = &sk->sk_v6_rcv_saddr;
233
234 fl6.flowi6_proto = IPPROTO_TCP;
235 fl6.daddr = sk->sk_v6_daddr;
236 fl6.saddr = saddr ? *saddr : np->saddr;
237 fl6.flowi6_oif = sk->sk_bound_dev_if;
238 fl6.flowi6_mark = sk->sk_mark;
239 fl6.fl6_dport = usin->sin6_port;
240 fl6.fl6_sport = inet->inet_sport;
241 fl6.flowi6_uid = sk->sk_uid;
242
243 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
244 final_p = fl6_update_dst(&fl6, opt, &final);
245
246 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
247
248 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
249 if (IS_ERR(dst)) {
250 err = PTR_ERR(dst);
251 goto failure;
252 }
253
254 if (!saddr) {
255 saddr = &fl6.saddr;
256 sk->sk_v6_rcv_saddr = *saddr;
257 }
258
259 /* set the source address */
260 np->saddr = *saddr;
261 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
262
263 sk->sk_gso_type = SKB_GSO_TCPV6;
264 ip6_dst_store(sk, dst, NULL, NULL);
265
266 if (tcp_death_row.sysctl_tw_recycle &&
267 !tp->rx_opt.ts_recent_stamp &&
268 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr))
269 tcp_fetch_timewait_stamp(sk, dst);
270
271 icsk->icsk_ext_hdr_len = 0;
272 if (opt)
273 icsk->icsk_ext_hdr_len = opt->opt_flen +
274 opt->opt_nflen;
275
276 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
277
278 inet->inet_dport = usin->sin6_port;
279
280 tcp_set_state(sk, TCP_SYN_SENT);
281 err = inet6_hash_connect(&tcp_death_row, sk);
282 if (err)
283 goto late_failure;
284
285 sk_set_txhash(sk);
286
287 if (!tp->write_seq && likely(!tp->repair))
288 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
289 sk->sk_v6_daddr.s6_addr32,
290 inet->inet_sport,
291 inet->inet_dport,
292 &tp->tsoffset);
293
294 err = tcp_connect(sk);
295 if (err)
296 goto late_failure;
297
298 return 0;
299
300 late_failure:
301 tcp_set_state(sk, TCP_CLOSE);
302 __sk_dst_reset(sk);
303 failure:
304 inet->inet_dport = 0;
305 sk->sk_route_caps = 0;
306 return err;
307 }
308
309 static void tcp_v6_mtu_reduced(struct sock *sk)
310 {
311 struct dst_entry *dst;
312
313 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
314 return;
315
316 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
317 if (!dst)
318 return;
319
320 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
321 tcp_sync_mss(sk, dst_mtu(dst));
322 tcp_simple_retransmit(sk);
323 }
324 }
325
326 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
327 u8 type, u8 code, int offset, __be32 info)
328 {
329 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
330 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
331 struct net *net = dev_net(skb->dev);
332 struct request_sock *fastopen;
333 struct ipv6_pinfo *np;
334 struct tcp_sock *tp;
335 __u32 seq, snd_una;
336 struct sock *sk;
337 bool fatal;
338 int err;
339
340 sk = __inet6_lookup_established(net, &tcp_hashinfo,
341 &hdr->daddr, th->dest,
342 &hdr->saddr, ntohs(th->source),
343 skb->dev->ifindex);
344
345 if (!sk) {
346 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev),
347 ICMP6_MIB_INERRORS);
348 return;
349 }
350
351 if (sk->sk_state == TCP_TIME_WAIT) {
352 inet_twsk_put(inet_twsk(sk));
353 return;
354 }
355 seq = ntohl(th->seq);
356 fatal = icmpv6_err_convert(type, code, &err);
357 if (sk->sk_state == TCP_NEW_SYN_RECV)
358 return tcp_req_err(sk, seq, fatal);
359
360 bh_lock_sock(sk);
361 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
362 __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
363
364 if (sk->sk_state == TCP_CLOSE)
365 goto out;
366
367 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
368 __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
369 goto out;
370 }
371
372 tp = tcp_sk(sk);
373 /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
374 fastopen = tp->fastopen_rsk;
375 snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
376 if (sk->sk_state != TCP_LISTEN &&
377 !between(seq, snd_una, tp->snd_nxt)) {
378 __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
379 goto out;
380 }
381
382 np = inet6_sk(sk);
383
384 if (type == NDISC_REDIRECT) {
385 if (!sock_owned_by_user(sk)) {
386 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
387
388 if (dst)
389 dst->ops->redirect(dst, sk, skb);
390 }
391 goto out;
392 }
393
394 if (type == ICMPV6_PKT_TOOBIG) {
395 /* We are not interested in TCP_LISTEN and open_requests
396 * (SYN-ACKs send out by Linux are always <576bytes so
397 * they should go through unfragmented).
398 */
399 if (sk->sk_state == TCP_LISTEN)
400 goto out;
401
402 if (!ip6_sk_accept_pmtu(sk))
403 goto out;
404
405 tp->mtu_info = ntohl(info);
406 if (!sock_owned_by_user(sk))
407 tcp_v6_mtu_reduced(sk);
408 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
409 &sk->sk_tsq_flags))
410 sock_hold(sk);
411 goto out;
412 }
413
414
415 /* Might be for an request_sock */
416 switch (sk->sk_state) {
417 case TCP_SYN_SENT:
418 case TCP_SYN_RECV:
419 /* Only in fast or simultaneous open. If a fast open socket is
420 * is already accepted it is treated as a connected one below.
421 */
422 if (fastopen && !fastopen->sk)
423 break;
424
425 if (!sock_owned_by_user(sk)) {
426 sk->sk_err = err;
427 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
428
429 tcp_done(sk);
430 } else
431 sk->sk_err_soft = err;
432 goto out;
433 }
434
435 if (!sock_owned_by_user(sk) && np->recverr) {
436 sk->sk_err = err;
437 sk->sk_error_report(sk);
438 } else
439 sk->sk_err_soft = err;
440
441 out:
442 bh_unlock_sock(sk);
443 sock_put(sk);
444 }
445
446
447 static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
448 struct flowi *fl,
449 struct request_sock *req,
450 struct tcp_fastopen_cookie *foc,
451 enum tcp_synack_type synack_type)
452 {
453 struct inet_request_sock *ireq = inet_rsk(req);
454 struct ipv6_pinfo *np = inet6_sk(sk);
455 struct ipv6_txoptions *opt;
456 struct flowi6 *fl6 = &fl->u.ip6;
457 struct sk_buff *skb;
458 int err = -ENOMEM;
459
460 /* First, grab a route. */
461 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
462 IPPROTO_TCP)) == NULL)
463 goto done;
464
465 skb = tcp_make_synack(sk, dst, req, foc, synack_type);
466
467 if (skb) {
468 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
469 &ireq->ir_v6_rmt_addr);
470
471 fl6->daddr = ireq->ir_v6_rmt_addr;
472 if (np->repflow && ireq->pktopts)
473 fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
474
475 rcu_read_lock();
476 opt = ireq->ipv6_opt;
477 if (!opt)
478 opt = rcu_dereference(np->opt);
479 err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);
480 rcu_read_unlock();
481 err = net_xmit_eval(err);
482 }
483
484 done:
485 return err;
486 }
487
488
489 static void tcp_v6_reqsk_destructor(struct request_sock *req)
490 {
491 kfree(inet_rsk(req)->ipv6_opt);
492 kfree_skb(inet_rsk(req)->pktopts);
493 }
494
495 #ifdef CONFIG_TCP_MD5SIG
496 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
497 const struct in6_addr *addr)
498 {
499 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
500 }
501
502 static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
503 const struct sock *addr_sk)
504 {
505 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
506 }
507
508 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
509 int optlen)
510 {
511 struct tcp_md5sig cmd;
512 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
513
514 if (optlen < sizeof(cmd))
515 return -EINVAL;
516
517 if (copy_from_user(&cmd, optval, sizeof(cmd)))
518 return -EFAULT;
519
520 if (sin6->sin6_family != AF_INET6)
521 return -EINVAL;
522
523 if (!cmd.tcpm_keylen) {
524 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
525 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
526 AF_INET);
527 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
528 AF_INET6);
529 }
530
531 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
532 return -EINVAL;
533
534 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
535 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
536 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
537
538 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
539 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
540 }
541
542 static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
543 const struct in6_addr *daddr,
544 const struct in6_addr *saddr,
545 const struct tcphdr *th, int nbytes)
546 {
547 struct tcp6_pseudohdr *bp;
548 struct scatterlist sg;
549 struct tcphdr *_th;
550
551 bp = hp->scratch;
552 /* 1. TCP pseudo-header (RFC2460) */
553 bp->saddr = *saddr;
554 bp->daddr = *daddr;
555 bp->protocol = cpu_to_be32(IPPROTO_TCP);
556 bp->len = cpu_to_be32(nbytes);
557
558 _th = (struct tcphdr *)(bp + 1);
559 memcpy(_th, th, sizeof(*th));
560 _th->check = 0;
561
562 sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
563 ahash_request_set_crypt(hp->md5_req, &sg, NULL,
564 sizeof(*bp) + sizeof(*th));
565 return crypto_ahash_update(hp->md5_req);
566 }
567
568 static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
569 const struct in6_addr *daddr, struct in6_addr *saddr,
570 const struct tcphdr *th)
571 {
572 struct tcp_md5sig_pool *hp;
573 struct ahash_request *req;
574
575 hp = tcp_get_md5sig_pool();
576 if (!hp)
577 goto clear_hash_noput;
578 req = hp->md5_req;
579
580 if (crypto_ahash_init(req))
581 goto clear_hash;
582 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
583 goto clear_hash;
584 if (tcp_md5_hash_key(hp, key))
585 goto clear_hash;
586 ahash_request_set_crypt(req, NULL, md5_hash, 0);
587 if (crypto_ahash_final(req))
588 goto clear_hash;
589
590 tcp_put_md5sig_pool();
591 return 0;
592
593 clear_hash:
594 tcp_put_md5sig_pool();
595 clear_hash_noput:
596 memset(md5_hash, 0, 16);
597 return 1;
598 }
599
600 static int tcp_v6_md5_hash_skb(char *md5_hash,
601 const struct tcp_md5sig_key *key,
602 const struct sock *sk,
603 const struct sk_buff *skb)
604 {
605 const struct in6_addr *saddr, *daddr;
606 struct tcp_md5sig_pool *hp;
607 struct ahash_request *req;
608 const struct tcphdr *th = tcp_hdr(skb);
609
610 if (sk) { /* valid for establish/request sockets */
611 saddr = &sk->sk_v6_rcv_saddr;
612 daddr = &sk->sk_v6_daddr;
613 } else {
614 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
615 saddr = &ip6h->saddr;
616 daddr = &ip6h->daddr;
617 }
618
619 hp = tcp_get_md5sig_pool();
620 if (!hp)
621 goto clear_hash_noput;
622 req = hp->md5_req;
623
624 if (crypto_ahash_init(req))
625 goto clear_hash;
626
627 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
628 goto clear_hash;
629 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
630 goto clear_hash;
631 if (tcp_md5_hash_key(hp, key))
632 goto clear_hash;
633 ahash_request_set_crypt(req, NULL, md5_hash, 0);
634 if (crypto_ahash_final(req))
635 goto clear_hash;
636
637 tcp_put_md5sig_pool();
638 return 0;
639
640 clear_hash:
641 tcp_put_md5sig_pool();
642 clear_hash_noput:
643 memset(md5_hash, 0, 16);
644 return 1;
645 }
646
647 #endif
648
649 static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
650 const struct sk_buff *skb)
651 {
652 #ifdef CONFIG_TCP_MD5SIG
653 const __u8 *hash_location = NULL;
654 struct tcp_md5sig_key *hash_expected;
655 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
656 const struct tcphdr *th = tcp_hdr(skb);
657 int genhash;
658 u8 newhash[16];
659
660 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
661 hash_location = tcp_parse_md5sig_option(th);
662
663 /* We've parsed the options - do we have a hash? */
664 if (!hash_expected && !hash_location)
665 return false;
666
667 if (hash_expected && !hash_location) {
668 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
669 return true;
670 }
671
672 if (!hash_expected && hash_location) {
673 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
674 return true;
675 }
676
677 /* check the signature */
678 genhash = tcp_v6_md5_hash_skb(newhash,
679 hash_expected,
680 NULL, skb);
681
682 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
683 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
684 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
685 genhash ? "failed" : "mismatch",
686 &ip6h->saddr, ntohs(th->source),
687 &ip6h->daddr, ntohs(th->dest));
688 return true;
689 }
690 #endif
691 return false;
692 }
693
694 static void tcp_v6_init_req(struct request_sock *req,
695 const struct sock *sk_listener,
696 struct sk_buff *skb)
697 {
698 struct inet_request_sock *ireq = inet_rsk(req);
699 const struct ipv6_pinfo *np = inet6_sk(sk_listener);
700
701 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
702 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
703
704 /* So that link locals have meaning */
705 if (!sk_listener->sk_bound_dev_if &&
706 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
707 ireq->ir_iif = tcp_v6_iif(skb);
708
709 if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
710 (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
711 np->rxopt.bits.rxinfo ||
712 np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
713 np->rxopt.bits.rxohlim || np->repflow)) {
714 atomic_inc(&skb->users);
715 ireq->pktopts = skb;
716 }
717 }
718
719 static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
720 struct flowi *fl,
721 const struct request_sock *req,
722 bool *strict)
723 {
724 if (strict)
725 *strict = true;
726 return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
727 }
728
729 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
730 .family = AF_INET6,
731 .obj_size = sizeof(struct tcp6_request_sock),
732 .rtx_syn_ack = tcp_rtx_synack,
733 .send_ack = tcp_v6_reqsk_send_ack,
734 .destructor = tcp_v6_reqsk_destructor,
735 .send_reset = tcp_v6_send_reset,
736 .syn_ack_timeout = tcp_syn_ack_timeout,
737 };
738
739 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
740 .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
741 sizeof(struct ipv6hdr),
742 #ifdef CONFIG_TCP_MD5SIG
743 .req_md5_lookup = tcp_v6_md5_lookup,
744 .calc_md5_hash = tcp_v6_md5_hash_skb,
745 #endif
746 .init_req = tcp_v6_init_req,
747 #ifdef CONFIG_SYN_COOKIES
748 .cookie_init_seq = cookie_v6_init_sequence,
749 #endif
750 .route_req = tcp_v6_route_req,
751 .init_seq = tcp_v6_init_sequence,
752 .send_synack = tcp_v6_send_synack,
753 };
754
755 static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
756 u32 ack, u32 win, u32 tsval, u32 tsecr,
757 int oif, struct tcp_md5sig_key *key, int rst,
758 u8 tclass, __be32 label)
759 {
760 const struct tcphdr *th = tcp_hdr(skb);
761 struct tcphdr *t1;
762 struct sk_buff *buff;
763 struct flowi6 fl6;
764 struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
765 struct sock *ctl_sk = net->ipv6.tcp_sk;
766 unsigned int tot_len = sizeof(struct tcphdr);
767 struct dst_entry *dst;
768 __be32 *topt;
769
770 if (tsecr)
771 tot_len += TCPOLEN_TSTAMP_ALIGNED;
772 #ifdef CONFIG_TCP_MD5SIG
773 if (key)
774 tot_len += TCPOLEN_MD5SIG_ALIGNED;
775 #endif
776
777 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
778 GFP_ATOMIC);
779 if (!buff)
780 return;
781
782 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
783
784 t1 = (struct tcphdr *) skb_push(buff, tot_len);
785 skb_reset_transport_header(buff);
786
787 /* Swap the send and the receive. */
788 memset(t1, 0, sizeof(*t1));
789 t1->dest = th->source;
790 t1->source = th->dest;
791 t1->doff = tot_len / 4;
792 t1->seq = htonl(seq);
793 t1->ack_seq = htonl(ack);
794 t1->ack = !rst || !th->ack;
795 t1->rst = rst;
796 t1->window = htons(win);
797
798 topt = (__be32 *)(t1 + 1);
799
800 if (tsecr) {
801 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
802 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
803 *topt++ = htonl(tsval);
804 *topt++ = htonl(tsecr);
805 }
806
807 #ifdef CONFIG_TCP_MD5SIG
808 if (key) {
809 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
810 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
811 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
812 &ipv6_hdr(skb)->saddr,
813 &ipv6_hdr(skb)->daddr, t1);
814 }
815 #endif
816
817 memset(&fl6, 0, sizeof(fl6));
818 fl6.daddr = ipv6_hdr(skb)->saddr;
819 fl6.saddr = ipv6_hdr(skb)->daddr;
820 fl6.flowlabel = label;
821
822 buff->ip_summed = CHECKSUM_PARTIAL;
823 buff->csum = 0;
824
825 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
826
827 fl6.flowi6_proto = IPPROTO_TCP;
828 if (rt6_need_strict(&fl6.daddr) && !oif)
829 fl6.flowi6_oif = tcp_v6_iif(skb);
830 else {
831 if (!oif && netif_index_is_l3_master(net, skb->skb_iif))
832 oif = skb->skb_iif;
833
834 fl6.flowi6_oif = oif;
835 }
836
837 fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark);
838 fl6.fl6_dport = t1->dest;
839 fl6.fl6_sport = t1->source;
840 fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
841 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
842
843 /* Pass a socket to ip6_dst_lookup either it is for RST
844 * Underlying function will use this to retrieve the network
845 * namespace
846 */
847 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
848 if (!IS_ERR(dst)) {
849 skb_dst_set(buff, dst);
850 ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass);
851 TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
852 if (rst)
853 TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
854 return;
855 }
856
857 kfree_skb(buff);
858 }
859
860 static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
861 {
862 const struct tcphdr *th = tcp_hdr(skb);
863 u32 seq = 0, ack_seq = 0;
864 struct tcp_md5sig_key *key = NULL;
865 #ifdef CONFIG_TCP_MD5SIG
866 const __u8 *hash_location = NULL;
867 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
868 unsigned char newhash[16];
869 int genhash;
870 struct sock *sk1 = NULL;
871 #endif
872 int oif;
873
874 if (th->rst)
875 return;
876
877 /* If sk not NULL, it means we did a successful lookup and incoming
878 * route had to be correct. prequeue might have dropped our dst.
879 */
880 if (!sk && !ipv6_unicast_destination(skb))
881 return;
882
883 #ifdef CONFIG_TCP_MD5SIG
884 rcu_read_lock();
885 hash_location = tcp_parse_md5sig_option(th);
886 if (sk && sk_fullsock(sk)) {
887 key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
888 } else if (hash_location) {
889 /*
890 * active side is lost. Try to find listening socket through
891 * source port, and then find md5 key through listening socket.
892 * we are not loose security here:
893 * Incoming packet is checked with md5 hash with finding key,
894 * no RST generated if md5 hash doesn't match.
895 */
896 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
897 &tcp_hashinfo, NULL, 0,
898 &ipv6h->saddr,
899 th->source, &ipv6h->daddr,
900 ntohs(th->source), tcp_v6_iif(skb));
901 if (!sk1)
902 goto out;
903
904 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
905 if (!key)
906 goto out;
907
908 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
909 if (genhash || memcmp(hash_location, newhash, 16) != 0)
910 goto out;
911 }
912 #endif
913
914 if (th->ack)
915 seq = ntohl(th->ack_seq);
916 else
917 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
918 (th->doff << 2);
919
920 oif = sk ? sk->sk_bound_dev_if : 0;
921 tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
922
923 #ifdef CONFIG_TCP_MD5SIG
924 out:
925 rcu_read_unlock();
926 #endif
927 }
928
929 static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
930 u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
931 struct tcp_md5sig_key *key, u8 tclass,
932 __be32 label)
933 {
934 tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
935 tclass, label);
936 }
937
938 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
939 {
940 struct inet_timewait_sock *tw = inet_twsk(sk);
941 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
942
943 tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
944 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
945 tcp_time_stamp + tcptw->tw_ts_offset,
946 tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
947 tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel));
948
949 inet_twsk_put(tw);
950 }
951
952 static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
953 struct request_sock *req)
954 {
955 /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
956 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
957 */
958 /* RFC 7323 2.3
959 * The window field (SEG.WND) of every outgoing segment, with the
960 * exception of <SYN> segments, MUST be right-shifted by
961 * Rcv.Wind.Shift bits:
962 */
963 tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
964 tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
965 tcp_rsk(req)->rcv_nxt,
966 req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
967 tcp_time_stamp + tcp_rsk(req)->ts_off,
968 req->ts_recent, sk->sk_bound_dev_if,
969 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
970 0, 0);
971 }
972
973
974 static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
975 {
976 #ifdef CONFIG_SYN_COOKIES
977 const struct tcphdr *th = tcp_hdr(skb);
978
979 if (!th->syn)
980 sk = cookie_v6_check(sk, skb);
981 #endif
982 return sk;
983 }
984
985 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
986 {
987 if (skb->protocol == htons(ETH_P_IP))
988 return tcp_v4_conn_request(sk, skb);
989
990 if (!ipv6_unicast_destination(skb))
991 goto drop;
992
993 return tcp_conn_request(&tcp6_request_sock_ops,
994 &tcp_request_sock_ipv6_ops, sk, skb);
995
996 drop:
997 tcp_listendrop(sk);
998 return 0; /* don't send reset */
999 }
1000
1001 static void tcp_v6_restore_cb(struct sk_buff *skb)
1002 {
1003 /* We need to move header back to the beginning if xfrm6_policy_check()
1004 * and tcp_v6_fill_cb() are going to be called again.
1005 * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there.
1006 */
1007 memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
1008 sizeof(struct inet6_skb_parm));
1009 }
1010
1011 static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
1012 struct request_sock *req,
1013 struct dst_entry *dst,
1014 struct request_sock *req_unhash,
1015 bool *own_req)
1016 {
1017 struct inet_request_sock *ireq;
1018 struct ipv6_pinfo *newnp;
1019 const struct ipv6_pinfo *np = inet6_sk(sk);
1020 struct ipv6_txoptions *opt;
1021 struct tcp6_sock *newtcp6sk;
1022 struct inet_sock *newinet;
1023 struct tcp_sock *newtp;
1024 struct sock *newsk;
1025 #ifdef CONFIG_TCP_MD5SIG
1026 struct tcp_md5sig_key *key;
1027 #endif
1028 struct flowi6 fl6;
1029
1030 if (skb->protocol == htons(ETH_P_IP)) {
1031 /*
1032 * v6 mapped
1033 */
1034
1035 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst,
1036 req_unhash, own_req);
1037
1038 if (!newsk)
1039 return NULL;
1040
1041 newtcp6sk = (struct tcp6_sock *)newsk;
1042 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1043
1044 newinet = inet_sk(newsk);
1045 newnp = inet6_sk(newsk);
1046 newtp = tcp_sk(newsk);
1047
1048 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1049
1050 newnp->saddr = newsk->sk_v6_rcv_saddr;
1051
1052 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1053 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1054 #ifdef CONFIG_TCP_MD5SIG
1055 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1056 #endif
1057
1058 newnp->ipv6_mc_list = NULL;
1059 newnp->ipv6_ac_list = NULL;
1060 newnp->ipv6_fl_list = NULL;
1061 newnp->pktoptions = NULL;
1062 newnp->opt = NULL;
1063 newnp->mcast_oif = tcp_v6_iif(skb);
1064 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1065 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1066 if (np->repflow)
1067 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1068
1069 /*
1070 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1071 * here, tcp_create_openreq_child now does this for us, see the comment in
1072 * that function for the gory details. -acme
1073 */
1074
1075 /* It is tricky place. Until this moment IPv4 tcp
1076 worked with IPv6 icsk.icsk_af_ops.
1077 Sync it now.
1078 */
1079 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1080
1081 return newsk;
1082 }
1083
1084 ireq = inet_rsk(req);
1085
1086 if (sk_acceptq_is_full(sk))
1087 goto out_overflow;
1088
1089 if (!dst) {
1090 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
1091 if (!dst)
1092 goto out;
1093 }
1094
1095 newsk = tcp_create_openreq_child(sk, req, skb);
1096 if (!newsk)
1097 goto out_nonewsk;
1098
1099 /*
1100 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1101 * count here, tcp_create_openreq_child now does this for us, see the
1102 * comment in that function for the gory details. -acme
1103 */
1104
1105 newsk->sk_gso_type = SKB_GSO_TCPV6;
1106 ip6_dst_store(newsk, dst, NULL, NULL);
1107 inet6_sk_rx_dst_set(newsk, skb);
1108
1109 newtcp6sk = (struct tcp6_sock *)newsk;
1110 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1111
1112 newtp = tcp_sk(newsk);
1113 newinet = inet_sk(newsk);
1114 newnp = inet6_sk(newsk);
1115
1116 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1117
1118 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1119 newnp->saddr = ireq->ir_v6_loc_addr;
1120 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1121 newsk->sk_bound_dev_if = ireq->ir_iif;
1122
1123 /* Now IPv6 options...
1124
1125 First: no IPv4 options.
1126 */
1127 newinet->inet_opt = NULL;
1128 newnp->ipv6_mc_list = NULL;
1129 newnp->ipv6_ac_list = NULL;
1130 newnp->ipv6_fl_list = NULL;
1131
1132 /* Clone RX bits */
1133 newnp->rxopt.all = np->rxopt.all;
1134
1135 newnp->pktoptions = NULL;
1136 newnp->opt = NULL;
1137 newnp->mcast_oif = tcp_v6_iif(skb);
1138 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1139 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1140 if (np->repflow)
1141 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1142
1143 /* Clone native IPv6 options from listening socket (if any)
1144
1145 Yes, keeping reference count would be much more clever,
1146 but we make one more one thing there: reattach optmem
1147 to newsk.
1148 */
1149 opt = ireq->ipv6_opt;
1150 if (!opt)
1151 opt = rcu_dereference(np->opt);
1152 if (opt) {
1153 opt = ipv6_dup_options(newsk, opt);
1154 RCU_INIT_POINTER(newnp->opt, opt);
1155 }
1156 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1157 if (opt)
1158 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
1159 opt->opt_flen;
1160
1161 tcp_ca_openreq_child(newsk, dst);
1162
1163 tcp_sync_mss(newsk, dst_mtu(dst));
1164 newtp->advmss = dst_metric_advmss(dst);
1165 if (tcp_sk(sk)->rx_opt.user_mss &&
1166 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1167 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1168
1169 tcp_initialize_rcv_mss(newsk);
1170
1171 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1172 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1173
1174 #ifdef CONFIG_TCP_MD5SIG
1175 /* Copy over the MD5 key from the original socket */
1176 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1177 if (key) {
1178 /* We're using one, so create a matching key
1179 * on the newsk structure. If we fail to get
1180 * memory, then we end up not copying the key
1181 * across. Shucks.
1182 */
1183 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1184 AF_INET6, key->key, key->keylen,
1185 sk_gfp_mask(sk, GFP_ATOMIC));
1186 }
1187 #endif
1188
1189 if (__inet_inherit_port(sk, newsk) < 0) {
1190 inet_csk_prepare_forced_close(newsk);
1191 tcp_done(newsk);
1192 goto out;
1193 }
1194 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
1195 if (*own_req) {
1196 tcp_move_syn(newtp, req);
1197
1198 /* Clone pktoptions received with SYN, if we own the req */
1199 if (ireq->pktopts) {
1200 newnp->pktoptions = skb_clone(ireq->pktopts,
1201 sk_gfp_mask(sk, GFP_ATOMIC));
1202 consume_skb(ireq->pktopts);
1203 ireq->pktopts = NULL;
1204 if (newnp->pktoptions) {
1205 tcp_v6_restore_cb(newnp->pktoptions);
1206 skb_set_owner_r(newnp->pktoptions, newsk);
1207 }
1208 }
1209 }
1210
1211 return newsk;
1212
1213 out_overflow:
1214 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1215 out_nonewsk:
1216 dst_release(dst);
1217 out:
1218 tcp_listendrop(sk);
1219 return NULL;
1220 }
1221
1222 /* The socket must have it's spinlock held when we get
1223 * here, unless it is a TCP_LISTEN socket.
1224 *
1225 * We have a potential double-lock case here, so even when
1226 * doing backlog processing we use the BH locking scheme.
1227 * This is because we cannot sleep with the original spinlock
1228 * held.
1229 */
1230 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1231 {
1232 struct ipv6_pinfo *np = inet6_sk(sk);
1233 struct tcp_sock *tp;
1234 struct sk_buff *opt_skb = NULL;
1235
1236 /* Imagine: socket is IPv6. IPv4 packet arrives,
1237 goes to IPv4 receive handler and backlogged.
1238 From backlog it always goes here. Kerboom...
1239 Fortunately, tcp_rcv_established and rcv_established
1240 handle them correctly, but it is not case with
1241 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1242 */
1243
1244 if (skb->protocol == htons(ETH_P_IP))
1245 return tcp_v4_do_rcv(sk, skb);
1246
1247 if (tcp_filter(sk, skb))
1248 goto discard;
1249
1250 /*
1251 * socket locking is here for SMP purposes as backlog rcv
1252 * is currently called with bh processing disabled.
1253 */
1254
1255 /* Do Stevens' IPV6_PKTOPTIONS.
1256
1257 Yes, guys, it is the only place in our code, where we
1258 may make it not affecting IPv4.
1259 The rest of code is protocol independent,
1260 and I do not like idea to uglify IPv4.
1261
1262 Actually, all the idea behind IPV6_PKTOPTIONS
1263 looks not very well thought. For now we latch
1264 options, received in the last packet, enqueued
1265 by tcp. Feel free to propose better solution.
1266 --ANK (980728)
1267 */
1268 if (np->rxopt.all)
1269 opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
1270
1271 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1272 struct dst_entry *dst = sk->sk_rx_dst;
1273
1274 sock_rps_save_rxhash(sk, skb);
1275 sk_mark_napi_id(sk, skb);
1276 if (dst) {
1277 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1278 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1279 dst_release(dst);
1280 sk->sk_rx_dst = NULL;
1281 }
1282 }
1283
1284 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1285 if (opt_skb)
1286 goto ipv6_pktoptions;
1287 return 0;
1288 }
1289
1290 if (tcp_checksum_complete(skb))
1291 goto csum_err;
1292
1293 if (sk->sk_state == TCP_LISTEN) {
1294 struct sock *nsk = tcp_v6_cookie_check(sk, skb);
1295
1296 if (!nsk)
1297 goto discard;
1298
1299 if (nsk != sk) {
1300 sock_rps_save_rxhash(nsk, skb);
1301 sk_mark_napi_id(nsk, skb);
1302 if (tcp_child_process(sk, nsk, skb))
1303 goto reset;
1304 if (opt_skb)
1305 __kfree_skb(opt_skb);
1306 return 0;
1307 }
1308 } else
1309 sock_rps_save_rxhash(sk, skb);
1310
1311 if (tcp_rcv_state_process(sk, skb))
1312 goto reset;
1313 if (opt_skb)
1314 goto ipv6_pktoptions;
1315 return 0;
1316
1317 reset:
1318 tcp_v6_send_reset(sk, skb);
1319 discard:
1320 if (opt_skb)
1321 __kfree_skb(opt_skb);
1322 kfree_skb(skb);
1323 return 0;
1324 csum_err:
1325 TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
1326 TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
1327 goto discard;
1328
1329
1330 ipv6_pktoptions:
1331 /* Do you ask, what is it?
1332
1333 1. skb was enqueued by tcp.
1334 2. skb is added to tail of read queue, rather than out of order.
1335 3. socket is not in passive state.
1336 4. Finally, it really contains options, which user wants to receive.
1337 */
1338 tp = tcp_sk(sk);
1339 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1340 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1341 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1342 np->mcast_oif = tcp_v6_iif(opt_skb);
1343 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1344 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1345 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
1346 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
1347 if (np->repflow)
1348 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
1349 if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
1350 skb_set_owner_r(opt_skb, sk);
1351 tcp_v6_restore_cb(opt_skb);
1352 opt_skb = xchg(&np->pktoptions, opt_skb);
1353 } else {
1354 __kfree_skb(opt_skb);
1355 opt_skb = xchg(&np->pktoptions, NULL);
1356 }
1357 }
1358
1359 kfree_skb(opt_skb);
1360 return 0;
1361 }
1362
1363 static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
1364 const struct tcphdr *th)
1365 {
1366 /* This is tricky: we move IP6CB at its correct location into
1367 * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
1368 * _decode_session6() uses IP6CB().
1369 * barrier() makes sure compiler won't play aliasing games.
1370 */
1371 memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
1372 sizeof(struct inet6_skb_parm));
1373 barrier();
1374
1375 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1376 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1377 skb->len - th->doff*4);
1378 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1379 TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
1380 TCP_SKB_CB(skb)->tcp_tw_isn = 0;
1381 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1382 TCP_SKB_CB(skb)->sacked = 0;
1383 }
1384
1385 static int tcp_v6_rcv(struct sk_buff *skb)
1386 {
1387 const struct tcphdr *th;
1388 const struct ipv6hdr *hdr;
1389 bool refcounted;
1390 struct sock *sk;
1391 int ret;
1392 struct net *net = dev_net(skb->dev);
1393
1394 if (skb->pkt_type != PACKET_HOST)
1395 goto discard_it;
1396
1397 /*
1398 * Count it even if it's bad.
1399 */
1400 __TCP_INC_STATS(net, TCP_MIB_INSEGS);
1401
1402 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1403 goto discard_it;
1404
1405 th = (const struct tcphdr *)skb->data;
1406
1407 if (unlikely(th->doff < sizeof(struct tcphdr)/4))
1408 goto bad_packet;
1409 if (!pskb_may_pull(skb, th->doff*4))
1410 goto discard_it;
1411
1412 if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo))
1413 goto csum_error;
1414
1415 th = (const struct tcphdr *)skb->data;
1416 hdr = ipv6_hdr(skb);
1417
1418 lookup:
1419 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th),
1420 th->source, th->dest, inet6_iif(skb),
1421 &refcounted);
1422 if (!sk)
1423 goto no_tcp_socket;
1424
1425 process:
1426 if (sk->sk_state == TCP_TIME_WAIT)
1427 goto do_time_wait;
1428
1429 if (sk->sk_state == TCP_NEW_SYN_RECV) {
1430 struct request_sock *req = inet_reqsk(sk);
1431 struct sock *nsk;
1432
1433 sk = req->rsk_listener;
1434 tcp_v6_fill_cb(skb, hdr, th);
1435 if (tcp_v6_inbound_md5_hash(sk, skb)) {
1436 sk_drops_add(sk, skb);
1437 reqsk_put(req);
1438 goto discard_it;
1439 }
1440 if (unlikely(sk->sk_state != TCP_LISTEN)) {
1441 inet_csk_reqsk_queue_drop_and_put(sk, req);
1442 goto lookup;
1443 }
1444 sock_hold(sk);
1445 refcounted = true;
1446 nsk = tcp_check_req(sk, skb, req, false);
1447 if (!nsk) {
1448 reqsk_put(req);
1449 goto discard_and_relse;
1450 }
1451 if (nsk == sk) {
1452 reqsk_put(req);
1453 tcp_v6_restore_cb(skb);
1454 } else if (tcp_child_process(sk, nsk, skb)) {
1455 tcp_v6_send_reset(nsk, skb);
1456 goto discard_and_relse;
1457 } else {
1458 sock_put(sk);
1459 return 0;
1460 }
1461 }
1462 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1463 __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
1464 goto discard_and_relse;
1465 }
1466
1467 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1468 goto discard_and_relse;
1469
1470 tcp_v6_fill_cb(skb, hdr, th);
1471
1472 if (tcp_v6_inbound_md5_hash(sk, skb))
1473 goto discard_and_relse;
1474
1475 if (tcp_filter(sk, skb))
1476 goto discard_and_relse;
1477 th = (const struct tcphdr *)skb->data;
1478 hdr = ipv6_hdr(skb);
1479
1480 skb->dev = NULL;
1481
1482 if (sk->sk_state == TCP_LISTEN) {
1483 ret = tcp_v6_do_rcv(sk, skb);
1484 goto put_and_return;
1485 }
1486
1487 sk_incoming_cpu_update(sk);
1488
1489 bh_lock_sock_nested(sk);
1490 tcp_segs_in(tcp_sk(sk), skb);
1491 ret = 0;
1492 if (!sock_owned_by_user(sk)) {
1493 if (!tcp_prequeue(sk, skb))
1494 ret = tcp_v6_do_rcv(sk, skb);
1495 } else if (tcp_add_backlog(sk, skb)) {
1496 goto discard_and_relse;
1497 }
1498 bh_unlock_sock(sk);
1499
1500 put_and_return:
1501 if (refcounted)
1502 sock_put(sk);
1503 return ret ? -1 : 0;
1504
1505 no_tcp_socket:
1506 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1507 goto discard_it;
1508
1509 tcp_v6_fill_cb(skb, hdr, th);
1510
1511 if (tcp_checksum_complete(skb)) {
1512 csum_error:
1513 __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS);
1514 bad_packet:
1515 __TCP_INC_STATS(net, TCP_MIB_INERRS);
1516 } else {
1517 tcp_v6_send_reset(NULL, skb);
1518 }
1519
1520 discard_it:
1521 kfree_skb(skb);
1522 return 0;
1523
1524 discard_and_relse:
1525 sk_drops_add(sk, skb);
1526 if (refcounted)
1527 sock_put(sk);
1528 goto discard_it;
1529
1530 do_time_wait:
1531 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1532 inet_twsk_put(inet_twsk(sk));
1533 goto discard_it;
1534 }
1535
1536 tcp_v6_fill_cb(skb, hdr, th);
1537
1538 if (tcp_checksum_complete(skb)) {
1539 inet_twsk_put(inet_twsk(sk));
1540 goto csum_error;
1541 }
1542
1543 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1544 case TCP_TW_SYN:
1545 {
1546 struct sock *sk2;
1547
1548 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1549 skb, __tcp_hdrlen(th),
1550 &ipv6_hdr(skb)->saddr, th->source,
1551 &ipv6_hdr(skb)->daddr,
1552 ntohs(th->dest), tcp_v6_iif(skb));
1553 if (sk2) {
1554 struct inet_timewait_sock *tw = inet_twsk(sk);
1555 inet_twsk_deschedule_put(tw);
1556 sk = sk2;
1557 tcp_v6_restore_cb(skb);
1558 refcounted = false;
1559 goto process;
1560 }
1561 /* Fall through to ACK */
1562 }
1563 case TCP_TW_ACK:
1564 tcp_v6_timewait_ack(sk, skb);
1565 break;
1566 case TCP_TW_RST:
1567 tcp_v6_restore_cb(skb);
1568 tcp_v6_send_reset(sk, skb);
1569 inet_twsk_deschedule_put(inet_twsk(sk));
1570 goto discard_it;
1571 case TCP_TW_SUCCESS:
1572 ;
1573 }
1574 goto discard_it;
1575 }
1576
1577 static void tcp_v6_early_demux(struct sk_buff *skb)
1578 {
1579 const struct ipv6hdr *hdr;
1580 const struct tcphdr *th;
1581 struct sock *sk;
1582
1583 if (skb->pkt_type != PACKET_HOST)
1584 return;
1585
1586 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1587 return;
1588
1589 hdr = ipv6_hdr(skb);
1590 th = tcp_hdr(skb);
1591
1592 if (th->doff < sizeof(struct tcphdr) / 4)
1593 return;
1594
1595 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
1596 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1597 &hdr->saddr, th->source,
1598 &hdr->daddr, ntohs(th->dest),
1599 inet6_iif(skb));
1600 if (sk) {
1601 skb->sk = sk;
1602 skb->destructor = sock_edemux;
1603 if (sk_fullsock(sk)) {
1604 struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
1605
1606 if (dst)
1607 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1608 if (dst &&
1609 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1610 skb_dst_set_noref(skb, dst);
1611 }
1612 }
1613 }
1614
1615 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1616 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1617 .twsk_unique = tcp_twsk_unique,
1618 .twsk_destructor = tcp_twsk_destructor,
1619 };
1620
1621 static const struct inet_connection_sock_af_ops ipv6_specific = {
1622 .queue_xmit = inet6_csk_xmit,
1623 .send_check = tcp_v6_send_check,
1624 .rebuild_header = inet6_sk_rebuild_header,
1625 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1626 .conn_request = tcp_v6_conn_request,
1627 .syn_recv_sock = tcp_v6_syn_recv_sock,
1628 .net_header_len = sizeof(struct ipv6hdr),
1629 .net_frag_header_len = sizeof(struct frag_hdr),
1630 .setsockopt = ipv6_setsockopt,
1631 .getsockopt = ipv6_getsockopt,
1632 .addr2sockaddr = inet6_csk_addr2sockaddr,
1633 .sockaddr_len = sizeof(struct sockaddr_in6),
1634 .bind_conflict = inet6_csk_bind_conflict,
1635 #ifdef CONFIG_COMPAT
1636 .compat_setsockopt = compat_ipv6_setsockopt,
1637 .compat_getsockopt = compat_ipv6_getsockopt,
1638 #endif
1639 .mtu_reduced = tcp_v6_mtu_reduced,
1640 };
1641
1642 #ifdef CONFIG_TCP_MD5SIG
1643 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1644 .md5_lookup = tcp_v6_md5_lookup,
1645 .calc_md5_hash = tcp_v6_md5_hash_skb,
1646 .md5_parse = tcp_v6_parse_md5_keys,
1647 };
1648 #endif
1649
1650 /*
1651 * TCP over IPv4 via INET6 API
1652 */
1653 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1654 .queue_xmit = ip_queue_xmit,
1655 .send_check = tcp_v4_send_check,
1656 .rebuild_header = inet_sk_rebuild_header,
1657 .sk_rx_dst_set = inet_sk_rx_dst_set,
1658 .conn_request = tcp_v6_conn_request,
1659 .syn_recv_sock = tcp_v6_syn_recv_sock,
1660 .net_header_len = sizeof(struct iphdr),
1661 .setsockopt = ipv6_setsockopt,
1662 .getsockopt = ipv6_getsockopt,
1663 .addr2sockaddr = inet6_csk_addr2sockaddr,
1664 .sockaddr_len = sizeof(struct sockaddr_in6),
1665 .bind_conflict = inet6_csk_bind_conflict,
1666 #ifdef CONFIG_COMPAT
1667 .compat_setsockopt = compat_ipv6_setsockopt,
1668 .compat_getsockopt = compat_ipv6_getsockopt,
1669 #endif
1670 .mtu_reduced = tcp_v4_mtu_reduced,
1671 };
1672
1673 #ifdef CONFIG_TCP_MD5SIG
1674 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1675 .md5_lookup = tcp_v4_md5_lookup,
1676 .calc_md5_hash = tcp_v4_md5_hash_skb,
1677 .md5_parse = tcp_v6_parse_md5_keys,
1678 };
1679 #endif
1680
1681 /* NOTE: A lot of things set to zero explicitly by call to
1682 * sk_alloc() so need not be done here.
1683 */
1684 static int tcp_v6_init_sock(struct sock *sk)
1685 {
1686 struct inet_connection_sock *icsk = inet_csk(sk);
1687
1688 tcp_init_sock(sk);
1689
1690 icsk->icsk_af_ops = &ipv6_specific;
1691
1692 #ifdef CONFIG_TCP_MD5SIG
1693 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1694 #endif
1695
1696 return 0;
1697 }
1698
1699 static void tcp_v6_destroy_sock(struct sock *sk)
1700 {
1701 tcp_v4_destroy_sock(sk);
1702 inet6_destroy_sock(sk);
1703 }
1704
1705 #ifdef CONFIG_PROC_FS
1706 /* Proc filesystem TCPv6 sock list dumping. */
1707 static void get_openreq6(struct seq_file *seq,
1708 const struct request_sock *req, int i)
1709 {
1710 long ttd = req->rsk_timer.expires - jiffies;
1711 const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
1712 const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
1713
1714 if (ttd < 0)
1715 ttd = 0;
1716
1717 seq_printf(seq,
1718 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1719 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1720 i,
1721 src->s6_addr32[0], src->s6_addr32[1],
1722 src->s6_addr32[2], src->s6_addr32[3],
1723 inet_rsk(req)->ir_num,
1724 dest->s6_addr32[0], dest->s6_addr32[1],
1725 dest->s6_addr32[2], dest->s6_addr32[3],
1726 ntohs(inet_rsk(req)->ir_rmt_port),
1727 TCP_SYN_RECV,
1728 0, 0, /* could print option size, but that is af dependent. */
1729 1, /* timers active (only the expire timer) */
1730 jiffies_to_clock_t(ttd),
1731 req->num_timeout,
1732 from_kuid_munged(seq_user_ns(seq),
1733 sock_i_uid(req->rsk_listener)),
1734 0, /* non standard timer */
1735 0, /* open_requests have no inode */
1736 0, req);
1737 }
1738
1739 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1740 {
1741 const struct in6_addr *dest, *src;
1742 __u16 destp, srcp;
1743 int timer_active;
1744 unsigned long timer_expires;
1745 const struct inet_sock *inet = inet_sk(sp);
1746 const struct tcp_sock *tp = tcp_sk(sp);
1747 const struct inet_connection_sock *icsk = inet_csk(sp);
1748 const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq;
1749 int rx_queue;
1750 int state;
1751
1752 dest = &sp->sk_v6_daddr;
1753 src = &sp->sk_v6_rcv_saddr;
1754 destp = ntohs(inet->inet_dport);
1755 srcp = ntohs(inet->inet_sport);
1756
1757 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
1758 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
1759 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
1760 timer_active = 1;
1761 timer_expires = icsk->icsk_timeout;
1762 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1763 timer_active = 4;
1764 timer_expires = icsk->icsk_timeout;
1765 } else if (timer_pending(&sp->sk_timer)) {
1766 timer_active = 2;
1767 timer_expires = sp->sk_timer.expires;
1768 } else {
1769 timer_active = 0;
1770 timer_expires = jiffies;
1771 }
1772
1773 state = sk_state_load(sp);
1774 if (state == TCP_LISTEN)
1775 rx_queue = sp->sk_ack_backlog;
1776 else
1777 /* Because we don't lock the socket,
1778 * we might find a transient negative value.
1779 */
1780 rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0);
1781
1782 seq_printf(seq,
1783 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1784 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\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 state,
1791 tp->write_seq - tp->snd_una,
1792 rx_queue,
1793 timer_active,
1794 jiffies_delta_to_clock_t(timer_expires - jiffies),
1795 icsk->icsk_retransmits,
1796 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1797 icsk->icsk_probes_out,
1798 sock_i_ino(sp),
1799 atomic_read(&sp->sk_refcnt), sp,
1800 jiffies_to_clock_t(icsk->icsk_rto),
1801 jiffies_to_clock_t(icsk->icsk_ack.ato),
1802 (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
1803 tp->snd_cwnd,
1804 state == TCP_LISTEN ?
1805 fastopenq->max_qlen :
1806 (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)
1807 );
1808 }
1809
1810 static void get_timewait6_sock(struct seq_file *seq,
1811 struct inet_timewait_sock *tw, int i)
1812 {
1813 long delta = tw->tw_timer.expires - jiffies;
1814 const struct in6_addr *dest, *src;
1815 __u16 destp, srcp;
1816
1817 dest = &tw->tw_v6_daddr;
1818 src = &tw->tw_v6_rcv_saddr;
1819 destp = ntohs(tw->tw_dport);
1820 srcp = ntohs(tw->tw_sport);
1821
1822 seq_printf(seq,
1823 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1824 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1825 i,
1826 src->s6_addr32[0], src->s6_addr32[1],
1827 src->s6_addr32[2], src->s6_addr32[3], srcp,
1828 dest->s6_addr32[0], dest->s6_addr32[1],
1829 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1830 tw->tw_substate, 0, 0,
1831 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1832 atomic_read(&tw->tw_refcnt), tw);
1833 }
1834
1835 static int tcp6_seq_show(struct seq_file *seq, void *v)
1836 {
1837 struct tcp_iter_state *st;
1838 struct sock *sk = v;
1839
1840 if (v == SEQ_START_TOKEN) {
1841 seq_puts(seq,
1842 " sl "
1843 "local_address "
1844 "remote_address "
1845 "st tx_queue rx_queue tr tm->when retrnsmt"
1846 " uid timeout inode\n");
1847 goto out;
1848 }
1849 st = seq->private;
1850
1851 if (sk->sk_state == TCP_TIME_WAIT)
1852 get_timewait6_sock(seq, v, st->num);
1853 else if (sk->sk_state == TCP_NEW_SYN_RECV)
1854 get_openreq6(seq, v, st->num);
1855 else
1856 get_tcp6_sock(seq, v, st->num);
1857 out:
1858 return 0;
1859 }
1860
1861 static const struct file_operations tcp6_afinfo_seq_fops = {
1862 .owner = THIS_MODULE,
1863 .open = tcp_seq_open,
1864 .read = seq_read,
1865 .llseek = seq_lseek,
1866 .release = seq_release_net
1867 };
1868
1869 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1870 .name = "tcp6",
1871 .family = AF_INET6,
1872 .seq_fops = &tcp6_afinfo_seq_fops,
1873 .seq_ops = {
1874 .show = tcp6_seq_show,
1875 },
1876 };
1877
1878 int __net_init tcp6_proc_init(struct net *net)
1879 {
1880 return tcp_proc_register(net, &tcp6_seq_afinfo);
1881 }
1882
1883 void tcp6_proc_exit(struct net *net)
1884 {
1885 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1886 }
1887 #endif
1888
1889 struct proto tcpv6_prot = {
1890 .name = "TCPv6",
1891 .owner = THIS_MODULE,
1892 .close = tcp_close,
1893 .connect = tcp_v6_connect,
1894 .disconnect = tcp_disconnect,
1895 .accept = inet_csk_accept,
1896 .ioctl = tcp_ioctl,
1897 .init = tcp_v6_init_sock,
1898 .destroy = tcp_v6_destroy_sock,
1899 .shutdown = tcp_shutdown,
1900 .setsockopt = tcp_setsockopt,
1901 .getsockopt = tcp_getsockopt,
1902 .recvmsg = tcp_recvmsg,
1903 .sendmsg = tcp_sendmsg,
1904 .sendpage = tcp_sendpage,
1905 .backlog_rcv = tcp_v6_do_rcv,
1906 .release_cb = tcp_release_cb,
1907 .hash = inet6_hash,
1908 .unhash = inet_unhash,
1909 .get_port = inet_csk_get_port,
1910 .enter_memory_pressure = tcp_enter_memory_pressure,
1911 .stream_memory_free = tcp_stream_memory_free,
1912 .sockets_allocated = &tcp_sockets_allocated,
1913 .memory_allocated = &tcp_memory_allocated,
1914 .memory_pressure = &tcp_memory_pressure,
1915 .orphan_count = &tcp_orphan_count,
1916 .sysctl_mem = sysctl_tcp_mem,
1917 .sysctl_wmem = sysctl_tcp_wmem,
1918 .sysctl_rmem = sysctl_tcp_rmem,
1919 .max_header = MAX_TCP_HEADER,
1920 .obj_size = sizeof(struct tcp6_sock),
1921 .slab_flags = SLAB_DESTROY_BY_RCU,
1922 .twsk_prot = &tcp6_timewait_sock_ops,
1923 .rsk_prot = &tcp6_request_sock_ops,
1924 .h.hashinfo = &tcp_hashinfo,
1925 .no_autobind = true,
1926 #ifdef CONFIG_COMPAT
1927 .compat_setsockopt = compat_tcp_setsockopt,
1928 .compat_getsockopt = compat_tcp_getsockopt,
1929 #endif
1930 .diag_destroy = tcp_abort,
1931 };
1932
1933 static const struct inet6_protocol tcpv6_protocol = {
1934 .early_demux = tcp_v6_early_demux,
1935 .handler = tcp_v6_rcv,
1936 .err_handler = tcp_v6_err,
1937 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1938 };
1939
1940 static struct inet_protosw tcpv6_protosw = {
1941 .type = SOCK_STREAM,
1942 .protocol = IPPROTO_TCP,
1943 .prot = &tcpv6_prot,
1944 .ops = &inet6_stream_ops,
1945 .flags = INET_PROTOSW_PERMANENT |
1946 INET_PROTOSW_ICSK,
1947 };
1948
1949 static int __net_init tcpv6_net_init(struct net *net)
1950 {
1951 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1952 SOCK_RAW, IPPROTO_TCP, net);
1953 }
1954
1955 static void __net_exit tcpv6_net_exit(struct net *net)
1956 {
1957 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1958 }
1959
1960 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1961 {
1962 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1963 }
1964
1965 static struct pernet_operations tcpv6_net_ops = {
1966 .init = tcpv6_net_init,
1967 .exit = tcpv6_net_exit,
1968 .exit_batch = tcpv6_net_exit_batch,
1969 };
1970
1971 int __init tcpv6_init(void)
1972 {
1973 int ret;
1974
1975 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1976 if (ret)
1977 goto out;
1978
1979 /* register inet6 protocol */
1980 ret = inet6_register_protosw(&tcpv6_protosw);
1981 if (ret)
1982 goto out_tcpv6_protocol;
1983
1984 ret = register_pernet_subsys(&tcpv6_net_ops);
1985 if (ret)
1986 goto out_tcpv6_protosw;
1987 out:
1988 return ret;
1989
1990 out_tcpv6_protosw:
1991 inet6_unregister_protosw(&tcpv6_protosw);
1992 out_tcpv6_protocol:
1993 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1994 goto out;
1995 }
1996
1997 void tcpv6_exit(void)
1998 {
1999 unregister_pernet_subsys(&tcpv6_net_ops);
2000 inet6_unregister_protosw(&tcpv6_protosw);
2001 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2002 }
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