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Linux 4.11-rc2
[mirror_ubuntu-jammy-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 u32 seq;
126 int err;
127 struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
128
129 if (addr_len < SIN6_LEN_RFC2133)
130 return -EINVAL;
131
132 if (usin->sin6_family != AF_INET6)
133 return -EAFNOSUPPORT;
134
135 memset(&fl6, 0, sizeof(fl6));
136
137 if (np->sndflow) {
138 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
139 IP6_ECN_flow_init(fl6.flowlabel);
140 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
141 struct ip6_flowlabel *flowlabel;
142 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
143 if (!flowlabel)
144 return -EINVAL;
145 fl6_sock_release(flowlabel);
146 }
147 }
148
149 /*
150 * connect() to INADDR_ANY means loopback (BSD'ism).
151 */
152
153 if (ipv6_addr_any(&usin->sin6_addr)) {
154 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
155 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
156 &usin->sin6_addr);
157 else
158 usin->sin6_addr = in6addr_loopback;
159 }
160
161 addr_type = ipv6_addr_type(&usin->sin6_addr);
162
163 if (addr_type & IPV6_ADDR_MULTICAST)
164 return -ENETUNREACH;
165
166 if (addr_type&IPV6_ADDR_LINKLOCAL) {
167 if (addr_len >= sizeof(struct sockaddr_in6) &&
168 usin->sin6_scope_id) {
169 /* If interface is set while binding, indices
170 * must coincide.
171 */
172 if (sk->sk_bound_dev_if &&
173 sk->sk_bound_dev_if != usin->sin6_scope_id)
174 return -EINVAL;
175
176 sk->sk_bound_dev_if = usin->sin6_scope_id;
177 }
178
179 /* Connect to link-local address requires an interface */
180 if (!sk->sk_bound_dev_if)
181 return -EINVAL;
182 }
183
184 if (tp->rx_opt.ts_recent_stamp &&
185 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
186 tp->rx_opt.ts_recent = 0;
187 tp->rx_opt.ts_recent_stamp = 0;
188 tp->write_seq = 0;
189 }
190
191 sk->sk_v6_daddr = usin->sin6_addr;
192 np->flow_label = fl6.flowlabel;
193
194 /*
195 * TCP over IPv4
196 */
197
198 if (addr_type & IPV6_ADDR_MAPPED) {
199 u32 exthdrlen = icsk->icsk_ext_hdr_len;
200 struct sockaddr_in sin;
201
202 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
203
204 if (__ipv6_only_sock(sk))
205 return -ENETUNREACH;
206
207 sin.sin_family = AF_INET;
208 sin.sin_port = usin->sin6_port;
209 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
210
211 icsk->icsk_af_ops = &ipv6_mapped;
212 sk->sk_backlog_rcv = tcp_v4_do_rcv;
213 #ifdef CONFIG_TCP_MD5SIG
214 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
215 #endif
216
217 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
218
219 if (err) {
220 icsk->icsk_ext_hdr_len = exthdrlen;
221 icsk->icsk_af_ops = &ipv6_specific;
222 sk->sk_backlog_rcv = tcp_v6_do_rcv;
223 #ifdef CONFIG_TCP_MD5SIG
224 tp->af_specific = &tcp_sock_ipv6_specific;
225 #endif
226 goto failure;
227 }
228 np->saddr = sk->sk_v6_rcv_saddr;
229
230 return err;
231 }
232
233 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
234 saddr = &sk->sk_v6_rcv_saddr;
235
236 fl6.flowi6_proto = IPPROTO_TCP;
237 fl6.daddr = sk->sk_v6_daddr;
238 fl6.saddr = saddr ? *saddr : np->saddr;
239 fl6.flowi6_oif = sk->sk_bound_dev_if;
240 fl6.flowi6_mark = sk->sk_mark;
241 fl6.fl6_dport = usin->sin6_port;
242 fl6.fl6_sport = inet->inet_sport;
243 fl6.flowi6_uid = sk->sk_uid;
244
245 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
246 final_p = fl6_update_dst(&fl6, opt, &final);
247
248 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
249
250 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
251 if (IS_ERR(dst)) {
252 err = PTR_ERR(dst);
253 goto failure;
254 }
255
256 if (!saddr) {
257 saddr = &fl6.saddr;
258 sk->sk_v6_rcv_saddr = *saddr;
259 }
260
261 /* set the source address */
262 np->saddr = *saddr;
263 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
264
265 sk->sk_gso_type = SKB_GSO_TCPV6;
266 ip6_dst_store(sk, dst, NULL, NULL);
267
268 if (tcp_death_row->sysctl_tw_recycle &&
269 !tp->rx_opt.ts_recent_stamp &&
270 ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr))
271 tcp_fetch_timewait_stamp(sk, dst);
272
273 icsk->icsk_ext_hdr_len = 0;
274 if (opt)
275 icsk->icsk_ext_hdr_len = opt->opt_flen +
276 opt->opt_nflen;
277
278 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
279
280 inet->inet_dport = usin->sin6_port;
281
282 tcp_set_state(sk, TCP_SYN_SENT);
283 err = inet6_hash_connect(tcp_death_row, sk);
284 if (err)
285 goto late_failure;
286
287 sk_set_txhash(sk);
288
289 if (likely(!tp->repair)) {
290 seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
291 sk->sk_v6_daddr.s6_addr32,
292 inet->inet_sport,
293 inet->inet_dport,
294 &tp->tsoffset);
295 if (!tp->write_seq)
296 tp->write_seq = seq;
297 }
298
299 if (tcp_fastopen_defer_connect(sk, &err))
300 return err;
301 if (err)
302 goto late_failure;
303
304 err = tcp_connect(sk);
305 if (err)
306 goto late_failure;
307
308 return 0;
309
310 late_failure:
311 tcp_set_state(sk, TCP_CLOSE);
312 failure:
313 inet->inet_dport = 0;
314 sk->sk_route_caps = 0;
315 return err;
316 }
317
318 static void tcp_v6_mtu_reduced(struct sock *sk)
319 {
320 struct dst_entry *dst;
321
322 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
323 return;
324
325 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
326 if (!dst)
327 return;
328
329 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
330 tcp_sync_mss(sk, dst_mtu(dst));
331 tcp_simple_retransmit(sk);
332 }
333 }
334
335 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
336 u8 type, u8 code, int offset, __be32 info)
337 {
338 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
339 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
340 struct net *net = dev_net(skb->dev);
341 struct request_sock *fastopen;
342 struct ipv6_pinfo *np;
343 struct tcp_sock *tp;
344 __u32 seq, snd_una;
345 struct sock *sk;
346 bool fatal;
347 int err;
348
349 sk = __inet6_lookup_established(net, &tcp_hashinfo,
350 &hdr->daddr, th->dest,
351 &hdr->saddr, ntohs(th->source),
352 skb->dev->ifindex);
353
354 if (!sk) {
355 __ICMP6_INC_STATS(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 seq = ntohl(th->seq);
365 fatal = icmpv6_err_convert(type, code, &err);
366 if (sk->sk_state == TCP_NEW_SYN_RECV)
367 return tcp_req_err(sk, seq, fatal);
368
369 bh_lock_sock(sk);
370 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
371 __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS);
372
373 if (sk->sk_state == TCP_CLOSE)
374 goto out;
375
376 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
377 __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
378 goto out;
379 }
380
381 tp = tcp_sk(sk);
382 /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */
383 fastopen = tp->fastopen_rsk;
384 snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una;
385 if (sk->sk_state != TCP_LISTEN &&
386 !between(seq, snd_una, tp->snd_nxt)) {
387 __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS);
388 goto out;
389 }
390
391 np = inet6_sk(sk);
392
393 if (type == NDISC_REDIRECT) {
394 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
395
396 if (dst)
397 dst->ops->redirect(dst, sk, skb);
398 goto out;
399 }
400
401 if (type == ICMPV6_PKT_TOOBIG) {
402 /* We are not interested in TCP_LISTEN and open_requests
403 * (SYN-ACKs send out by Linux are always <576bytes so
404 * they should go through unfragmented).
405 */
406 if (sk->sk_state == TCP_LISTEN)
407 goto out;
408
409 if (!ip6_sk_accept_pmtu(sk))
410 goto out;
411
412 tp->mtu_info = ntohl(info);
413 if (!sock_owned_by_user(sk))
414 tcp_v6_mtu_reduced(sk);
415 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
416 &sk->sk_tsq_flags))
417 sock_hold(sk);
418 goto out;
419 }
420
421
422 /* Might be for an request_sock */
423 switch (sk->sk_state) {
424 case TCP_SYN_SENT:
425 case TCP_SYN_RECV:
426 /* Only in fast or simultaneous open. If a fast open socket is
427 * is already accepted it is treated as a connected one below.
428 */
429 if (fastopen && !fastopen->sk)
430 break;
431
432 if (!sock_owned_by_user(sk)) {
433 sk->sk_err = err;
434 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
435
436 tcp_done(sk);
437 } else
438 sk->sk_err_soft = err;
439 goto out;
440 }
441
442 if (!sock_owned_by_user(sk) && np->recverr) {
443 sk->sk_err = err;
444 sk->sk_error_report(sk);
445 } else
446 sk->sk_err_soft = err;
447
448 out:
449 bh_unlock_sock(sk);
450 sock_put(sk);
451 }
452
453
454 static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
455 struct flowi *fl,
456 struct request_sock *req,
457 struct tcp_fastopen_cookie *foc,
458 enum tcp_synack_type synack_type)
459 {
460 struct inet_request_sock *ireq = inet_rsk(req);
461 struct ipv6_pinfo *np = inet6_sk(sk);
462 struct ipv6_txoptions *opt;
463 struct flowi6 *fl6 = &fl->u.ip6;
464 struct sk_buff *skb;
465 int err = -ENOMEM;
466
467 /* First, grab a route. */
468 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
469 IPPROTO_TCP)) == NULL)
470 goto done;
471
472 skb = tcp_make_synack(sk, dst, req, foc, synack_type);
473
474 if (skb) {
475 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
476 &ireq->ir_v6_rmt_addr);
477
478 fl6->daddr = ireq->ir_v6_rmt_addr;
479 if (np->repflow && ireq->pktopts)
480 fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
481
482 rcu_read_lock();
483 opt = ireq->ipv6_opt;
484 if (!opt)
485 opt = rcu_dereference(np->opt);
486 err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);
487 rcu_read_unlock();
488 err = net_xmit_eval(err);
489 }
490
491 done:
492 return err;
493 }
494
495
496 static void tcp_v6_reqsk_destructor(struct request_sock *req)
497 {
498 kfree(inet_rsk(req)->ipv6_opt);
499 kfree_skb(inet_rsk(req)->pktopts);
500 }
501
502 #ifdef CONFIG_TCP_MD5SIG
503 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
504 const struct in6_addr *addr)
505 {
506 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
507 }
508
509 static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
510 const struct sock *addr_sk)
511 {
512 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
513 }
514
515 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
516 int optlen)
517 {
518 struct tcp_md5sig cmd;
519 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
520
521 if (optlen < sizeof(cmd))
522 return -EINVAL;
523
524 if (copy_from_user(&cmd, optval, sizeof(cmd)))
525 return -EFAULT;
526
527 if (sin6->sin6_family != AF_INET6)
528 return -EINVAL;
529
530 if (!cmd.tcpm_keylen) {
531 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
532 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
533 AF_INET);
534 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
535 AF_INET6);
536 }
537
538 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
539 return -EINVAL;
540
541 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
542 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
543 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
544
545 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
546 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
547 }
548
549 static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
550 const struct in6_addr *daddr,
551 const struct in6_addr *saddr,
552 const struct tcphdr *th, int nbytes)
553 {
554 struct tcp6_pseudohdr *bp;
555 struct scatterlist sg;
556 struct tcphdr *_th;
557
558 bp = hp->scratch;
559 /* 1. TCP pseudo-header (RFC2460) */
560 bp->saddr = *saddr;
561 bp->daddr = *daddr;
562 bp->protocol = cpu_to_be32(IPPROTO_TCP);
563 bp->len = cpu_to_be32(nbytes);
564
565 _th = (struct tcphdr *)(bp + 1);
566 memcpy(_th, th, sizeof(*th));
567 _th->check = 0;
568
569 sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
570 ahash_request_set_crypt(hp->md5_req, &sg, NULL,
571 sizeof(*bp) + sizeof(*th));
572 return crypto_ahash_update(hp->md5_req);
573 }
574
575 static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
576 const struct in6_addr *daddr, struct in6_addr *saddr,
577 const struct tcphdr *th)
578 {
579 struct tcp_md5sig_pool *hp;
580 struct ahash_request *req;
581
582 hp = tcp_get_md5sig_pool();
583 if (!hp)
584 goto clear_hash_noput;
585 req = hp->md5_req;
586
587 if (crypto_ahash_init(req))
588 goto clear_hash;
589 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
590 goto clear_hash;
591 if (tcp_md5_hash_key(hp, key))
592 goto clear_hash;
593 ahash_request_set_crypt(req, NULL, md5_hash, 0);
594 if (crypto_ahash_final(req))
595 goto clear_hash;
596
597 tcp_put_md5sig_pool();
598 return 0;
599
600 clear_hash:
601 tcp_put_md5sig_pool();
602 clear_hash_noput:
603 memset(md5_hash, 0, 16);
604 return 1;
605 }
606
607 static int tcp_v6_md5_hash_skb(char *md5_hash,
608 const struct tcp_md5sig_key *key,
609 const struct sock *sk,
610 const struct sk_buff *skb)
611 {
612 const struct in6_addr *saddr, *daddr;
613 struct tcp_md5sig_pool *hp;
614 struct ahash_request *req;
615 const struct tcphdr *th = tcp_hdr(skb);
616
617 if (sk) { /* valid for establish/request sockets */
618 saddr = &sk->sk_v6_rcv_saddr;
619 daddr = &sk->sk_v6_daddr;
620 } else {
621 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
622 saddr = &ip6h->saddr;
623 daddr = &ip6h->daddr;
624 }
625
626 hp = tcp_get_md5sig_pool();
627 if (!hp)
628 goto clear_hash_noput;
629 req = hp->md5_req;
630
631 if (crypto_ahash_init(req))
632 goto clear_hash;
633
634 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
635 goto clear_hash;
636 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
637 goto clear_hash;
638 if (tcp_md5_hash_key(hp, key))
639 goto clear_hash;
640 ahash_request_set_crypt(req, NULL, md5_hash, 0);
641 if (crypto_ahash_final(req))
642 goto clear_hash;
643
644 tcp_put_md5sig_pool();
645 return 0;
646
647 clear_hash:
648 tcp_put_md5sig_pool();
649 clear_hash_noput:
650 memset(md5_hash, 0, 16);
651 return 1;
652 }
653
654 #endif
655
656 static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
657 const struct sk_buff *skb)
658 {
659 #ifdef CONFIG_TCP_MD5SIG
660 const __u8 *hash_location = NULL;
661 struct tcp_md5sig_key *hash_expected;
662 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
663 const struct tcphdr *th = tcp_hdr(skb);
664 int genhash;
665 u8 newhash[16];
666
667 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
668 hash_location = tcp_parse_md5sig_option(th);
669
670 /* We've parsed the options - do we have a hash? */
671 if (!hash_expected && !hash_location)
672 return false;
673
674 if (hash_expected && !hash_location) {
675 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
676 return true;
677 }
678
679 if (!hash_expected && hash_location) {
680 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
681 return true;
682 }
683
684 /* check the signature */
685 genhash = tcp_v6_md5_hash_skb(newhash,
686 hash_expected,
687 NULL, skb);
688
689 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
690 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
691 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
692 genhash ? "failed" : "mismatch",
693 &ip6h->saddr, ntohs(th->source),
694 &ip6h->daddr, ntohs(th->dest));
695 return true;
696 }
697 #endif
698 return false;
699 }
700
701 static void tcp_v6_init_req(struct request_sock *req,
702 const struct sock *sk_listener,
703 struct sk_buff *skb)
704 {
705 struct inet_request_sock *ireq = inet_rsk(req);
706 const struct ipv6_pinfo *np = inet6_sk(sk_listener);
707
708 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
709 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
710
711 /* So that link locals have meaning */
712 if (!sk_listener->sk_bound_dev_if &&
713 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
714 ireq->ir_iif = tcp_v6_iif(skb);
715
716 if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
717 (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
718 np->rxopt.bits.rxinfo ||
719 np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
720 np->rxopt.bits.rxohlim || np->repflow)) {
721 atomic_inc(&skb->users);
722 ireq->pktopts = skb;
723 }
724 }
725
726 static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
727 struct flowi *fl,
728 const struct request_sock *req,
729 bool *strict)
730 {
731 if (strict)
732 *strict = true;
733 return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
734 }
735
736 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
737 .family = AF_INET6,
738 .obj_size = sizeof(struct tcp6_request_sock),
739 .rtx_syn_ack = tcp_rtx_synack,
740 .send_ack = tcp_v6_reqsk_send_ack,
741 .destructor = tcp_v6_reqsk_destructor,
742 .send_reset = tcp_v6_send_reset,
743 .syn_ack_timeout = tcp_syn_ack_timeout,
744 };
745
746 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
747 .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
748 sizeof(struct ipv6hdr),
749 #ifdef CONFIG_TCP_MD5SIG
750 .req_md5_lookup = tcp_v6_md5_lookup,
751 .calc_md5_hash = tcp_v6_md5_hash_skb,
752 #endif
753 .init_req = tcp_v6_init_req,
754 #ifdef CONFIG_SYN_COOKIES
755 .cookie_init_seq = cookie_v6_init_sequence,
756 #endif
757 .route_req = tcp_v6_route_req,
758 .init_seq = tcp_v6_init_sequence,
759 .send_synack = tcp_v6_send_synack,
760 };
761
762 static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
763 u32 ack, u32 win, u32 tsval, u32 tsecr,
764 int oif, struct tcp_md5sig_key *key, int rst,
765 u8 tclass, __be32 label)
766 {
767 const struct tcphdr *th = tcp_hdr(skb);
768 struct tcphdr *t1;
769 struct sk_buff *buff;
770 struct flowi6 fl6;
771 struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
772 struct sock *ctl_sk = net->ipv6.tcp_sk;
773 unsigned int tot_len = sizeof(struct tcphdr);
774 struct dst_entry *dst;
775 __be32 *topt;
776
777 if (tsecr)
778 tot_len += TCPOLEN_TSTAMP_ALIGNED;
779 #ifdef CONFIG_TCP_MD5SIG
780 if (key)
781 tot_len += TCPOLEN_MD5SIG_ALIGNED;
782 #endif
783
784 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
785 GFP_ATOMIC);
786 if (!buff)
787 return;
788
789 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
790
791 t1 = (struct tcphdr *) skb_push(buff, tot_len);
792 skb_reset_transport_header(buff);
793
794 /* Swap the send and the receive. */
795 memset(t1, 0, sizeof(*t1));
796 t1->dest = th->source;
797 t1->source = th->dest;
798 t1->doff = tot_len / 4;
799 t1->seq = htonl(seq);
800 t1->ack_seq = htonl(ack);
801 t1->ack = !rst || !th->ack;
802 t1->rst = rst;
803 t1->window = htons(win);
804
805 topt = (__be32 *)(t1 + 1);
806
807 if (tsecr) {
808 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
809 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
810 *topt++ = htonl(tsval);
811 *topt++ = htonl(tsecr);
812 }
813
814 #ifdef CONFIG_TCP_MD5SIG
815 if (key) {
816 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
817 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
818 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
819 &ipv6_hdr(skb)->saddr,
820 &ipv6_hdr(skb)->daddr, t1);
821 }
822 #endif
823
824 memset(&fl6, 0, sizeof(fl6));
825 fl6.daddr = ipv6_hdr(skb)->saddr;
826 fl6.saddr = ipv6_hdr(skb)->daddr;
827 fl6.flowlabel = label;
828
829 buff->ip_summed = CHECKSUM_PARTIAL;
830 buff->csum = 0;
831
832 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
833
834 fl6.flowi6_proto = IPPROTO_TCP;
835 if (rt6_need_strict(&fl6.daddr) && !oif)
836 fl6.flowi6_oif = tcp_v6_iif(skb);
837 else {
838 if (!oif && netif_index_is_l3_master(net, skb->skb_iif))
839 oif = skb->skb_iif;
840
841 fl6.flowi6_oif = oif;
842 }
843
844 fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark);
845 fl6.fl6_dport = t1->dest;
846 fl6.fl6_sport = t1->source;
847 fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
848 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
849
850 /* Pass a socket to ip6_dst_lookup either it is for RST
851 * Underlying function will use this to retrieve the network
852 * namespace
853 */
854 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL);
855 if (!IS_ERR(dst)) {
856 skb_dst_set(buff, dst);
857 ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass);
858 TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
859 if (rst)
860 TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
861 return;
862 }
863
864 kfree_skb(buff);
865 }
866
867 static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
868 {
869 const struct tcphdr *th = tcp_hdr(skb);
870 u32 seq = 0, ack_seq = 0;
871 struct tcp_md5sig_key *key = NULL;
872 #ifdef CONFIG_TCP_MD5SIG
873 const __u8 *hash_location = NULL;
874 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
875 unsigned char newhash[16];
876 int genhash;
877 struct sock *sk1 = NULL;
878 #endif
879 int oif;
880
881 if (th->rst)
882 return;
883
884 /* If sk not NULL, it means we did a successful lookup and incoming
885 * route had to be correct. prequeue might have dropped our dst.
886 */
887 if (!sk && !ipv6_unicast_destination(skb))
888 return;
889
890 #ifdef CONFIG_TCP_MD5SIG
891 rcu_read_lock();
892 hash_location = tcp_parse_md5sig_option(th);
893 if (sk && sk_fullsock(sk)) {
894 key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
895 } else if (hash_location) {
896 /*
897 * active side is lost. Try to find listening socket through
898 * source port, and then find md5 key through listening socket.
899 * we are not loose security here:
900 * Incoming packet is checked with md5 hash with finding key,
901 * no RST generated if md5 hash doesn't match.
902 */
903 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
904 &tcp_hashinfo, NULL, 0,
905 &ipv6h->saddr,
906 th->source, &ipv6h->daddr,
907 ntohs(th->source), tcp_v6_iif(skb));
908 if (!sk1)
909 goto out;
910
911 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
912 if (!key)
913 goto out;
914
915 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
916 if (genhash || memcmp(hash_location, newhash, 16) != 0)
917 goto out;
918 }
919 #endif
920
921 if (th->ack)
922 seq = ntohl(th->ack_seq);
923 else
924 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
925 (th->doff << 2);
926
927 oif = sk ? sk->sk_bound_dev_if : 0;
928 tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);
929
930 #ifdef CONFIG_TCP_MD5SIG
931 out:
932 rcu_read_unlock();
933 #endif
934 }
935
936 static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
937 u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
938 struct tcp_md5sig_key *key, u8 tclass,
939 __be32 label)
940 {
941 tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0,
942 tclass, label);
943 }
944
945 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
946 {
947 struct inet_timewait_sock *tw = inet_twsk(sk);
948 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
949
950 tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
951 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
952 tcp_time_stamp + tcptw->tw_ts_offset,
953 tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
954 tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel));
955
956 inet_twsk_put(tw);
957 }
958
959 static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
960 struct request_sock *req)
961 {
962 /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
963 * sk->sk_state == TCP_SYN_RECV -> for Fast Open.
964 */
965 /* RFC 7323 2.3
966 * The window field (SEG.WND) of every outgoing segment, with the
967 * exception of <SYN> segments, MUST be right-shifted by
968 * Rcv.Wind.Shift bits:
969 */
970 tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ?
971 tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt,
972 tcp_rsk(req)->rcv_nxt,
973 req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
974 tcp_time_stamp + tcp_rsk(req)->ts_off,
975 req->ts_recent, sk->sk_bound_dev_if,
976 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr),
977 0, 0);
978 }
979
980
981 static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
982 {
983 #ifdef CONFIG_SYN_COOKIES
984 const struct tcphdr *th = tcp_hdr(skb);
985
986 if (!th->syn)
987 sk = cookie_v6_check(sk, skb);
988 #endif
989 return sk;
990 }
991
992 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
993 {
994 if (skb->protocol == htons(ETH_P_IP))
995 return tcp_v4_conn_request(sk, skb);
996
997 if (!ipv6_unicast_destination(skb))
998 goto drop;
999
1000 return tcp_conn_request(&tcp6_request_sock_ops,
1001 &tcp_request_sock_ipv6_ops, sk, skb);
1002
1003 drop:
1004 tcp_listendrop(sk);
1005 return 0; /* don't send reset */
1006 }
1007
1008 static void tcp_v6_restore_cb(struct sk_buff *skb)
1009 {
1010 /* We need to move header back to the beginning if xfrm6_policy_check()
1011 * and tcp_v6_fill_cb() are going to be called again.
1012 * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there.
1013 */
1014 memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6,
1015 sizeof(struct inet6_skb_parm));
1016 }
1017
1018 static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
1019 struct request_sock *req,
1020 struct dst_entry *dst,
1021 struct request_sock *req_unhash,
1022 bool *own_req)
1023 {
1024 struct inet_request_sock *ireq;
1025 struct ipv6_pinfo *newnp;
1026 const struct ipv6_pinfo *np = inet6_sk(sk);
1027 struct ipv6_txoptions *opt;
1028 struct tcp6_sock *newtcp6sk;
1029 struct inet_sock *newinet;
1030 struct tcp_sock *newtp;
1031 struct sock *newsk;
1032 #ifdef CONFIG_TCP_MD5SIG
1033 struct tcp_md5sig_key *key;
1034 #endif
1035 struct flowi6 fl6;
1036
1037 if (skb->protocol == htons(ETH_P_IP)) {
1038 /*
1039 * v6 mapped
1040 */
1041
1042 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst,
1043 req_unhash, own_req);
1044
1045 if (!newsk)
1046 return NULL;
1047
1048 newtcp6sk = (struct tcp6_sock *)newsk;
1049 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1050
1051 newinet = inet_sk(newsk);
1052 newnp = inet6_sk(newsk);
1053 newtp = tcp_sk(newsk);
1054
1055 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1056
1057 newnp->saddr = newsk->sk_v6_rcv_saddr;
1058
1059 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1060 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1061 #ifdef CONFIG_TCP_MD5SIG
1062 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1063 #endif
1064
1065 newnp->ipv6_ac_list = NULL;
1066 newnp->ipv6_fl_list = NULL;
1067 newnp->pktoptions = NULL;
1068 newnp->opt = NULL;
1069 newnp->mcast_oif = tcp_v6_iif(skb);
1070 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1071 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1072 if (np->repflow)
1073 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1074
1075 /*
1076 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1077 * here, tcp_create_openreq_child now does this for us, see the comment in
1078 * that function for the gory details. -acme
1079 */
1080
1081 /* It is tricky place. Until this moment IPv4 tcp
1082 worked with IPv6 icsk.icsk_af_ops.
1083 Sync it now.
1084 */
1085 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1086
1087 return newsk;
1088 }
1089
1090 ireq = inet_rsk(req);
1091
1092 if (sk_acceptq_is_full(sk))
1093 goto out_overflow;
1094
1095 if (!dst) {
1096 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
1097 if (!dst)
1098 goto out;
1099 }
1100
1101 newsk = tcp_create_openreq_child(sk, req, skb);
1102 if (!newsk)
1103 goto out_nonewsk;
1104
1105 /*
1106 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1107 * count here, tcp_create_openreq_child now does this for us, see the
1108 * comment in that function for the gory details. -acme
1109 */
1110
1111 newsk->sk_gso_type = SKB_GSO_TCPV6;
1112 ip6_dst_store(newsk, dst, NULL, NULL);
1113 inet6_sk_rx_dst_set(newsk, skb);
1114
1115 newtcp6sk = (struct tcp6_sock *)newsk;
1116 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1117
1118 newtp = tcp_sk(newsk);
1119 newinet = inet_sk(newsk);
1120 newnp = inet6_sk(newsk);
1121
1122 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1123
1124 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1125 newnp->saddr = ireq->ir_v6_loc_addr;
1126 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1127 newsk->sk_bound_dev_if = ireq->ir_iif;
1128
1129 /* Now IPv6 options...
1130
1131 First: no IPv4 options.
1132 */
1133 newinet->inet_opt = NULL;
1134 newnp->ipv6_ac_list = NULL;
1135 newnp->ipv6_fl_list = NULL;
1136
1137 /* Clone RX bits */
1138 newnp->rxopt.all = np->rxopt.all;
1139
1140 newnp->pktoptions = NULL;
1141 newnp->opt = NULL;
1142 newnp->mcast_oif = tcp_v6_iif(skb);
1143 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1144 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1145 if (np->repflow)
1146 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1147
1148 /* Clone native IPv6 options from listening socket (if any)
1149
1150 Yes, keeping reference count would be much more clever,
1151 but we make one more one thing there: reattach optmem
1152 to newsk.
1153 */
1154 opt = ireq->ipv6_opt;
1155 if (!opt)
1156 opt = rcu_dereference(np->opt);
1157 if (opt) {
1158 opt = ipv6_dup_options(newsk, opt);
1159 RCU_INIT_POINTER(newnp->opt, opt);
1160 }
1161 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1162 if (opt)
1163 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
1164 opt->opt_flen;
1165
1166 tcp_ca_openreq_child(newsk, dst);
1167
1168 tcp_sync_mss(newsk, dst_mtu(dst));
1169 newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst));
1170
1171 tcp_initialize_rcv_mss(newsk);
1172
1173 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1174 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1175
1176 #ifdef CONFIG_TCP_MD5SIG
1177 /* Copy over the MD5 key from the original socket */
1178 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1179 if (key) {
1180 /* We're using one, so create a matching key
1181 * on the newsk structure. If we fail to get
1182 * memory, then we end up not copying the key
1183 * across. Shucks.
1184 */
1185 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1186 AF_INET6, key->key, key->keylen,
1187 sk_gfp_mask(sk, GFP_ATOMIC));
1188 }
1189 #endif
1190
1191 if (__inet_inherit_port(sk, newsk) < 0) {
1192 inet_csk_prepare_forced_close(newsk);
1193 tcp_done(newsk);
1194 goto out;
1195 }
1196 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
1197 if (*own_req) {
1198 tcp_move_syn(newtp, req);
1199
1200 /* Clone pktoptions received with SYN, if we own the req */
1201 if (ireq->pktopts) {
1202 newnp->pktoptions = skb_clone(ireq->pktopts,
1203 sk_gfp_mask(sk, GFP_ATOMIC));
1204 consume_skb(ireq->pktopts);
1205 ireq->pktopts = NULL;
1206 if (newnp->pktoptions) {
1207 tcp_v6_restore_cb(newnp->pktoptions);
1208 skb_set_owner_r(newnp->pktoptions, newsk);
1209 }
1210 }
1211 }
1212
1213 return newsk;
1214
1215 out_overflow:
1216 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1217 out_nonewsk:
1218 dst_release(dst);
1219 out:
1220 tcp_listendrop(sk);
1221 return NULL;
1222 }
1223
1224 /* The socket must have it's spinlock held when we get
1225 * here, unless it is a TCP_LISTEN socket.
1226 *
1227 * We have a potential double-lock case here, so even when
1228 * doing backlog processing we use the BH locking scheme.
1229 * This is because we cannot sleep with the original spinlock
1230 * held.
1231 */
1232 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1233 {
1234 struct ipv6_pinfo *np = inet6_sk(sk);
1235 struct tcp_sock *tp;
1236 struct sk_buff *opt_skb = NULL;
1237
1238 /* Imagine: socket is IPv6. IPv4 packet arrives,
1239 goes to IPv4 receive handler and backlogged.
1240 From backlog it always goes here. Kerboom...
1241 Fortunately, tcp_rcv_established and rcv_established
1242 handle them correctly, but it is not case with
1243 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1244 */
1245
1246 if (skb->protocol == htons(ETH_P_IP))
1247 return tcp_v4_do_rcv(sk, skb);
1248
1249 if (tcp_filter(sk, skb))
1250 goto discard;
1251
1252 /*
1253 * socket locking is here for SMP purposes as backlog rcv
1254 * is currently called with bh processing disabled.
1255 */
1256
1257 /* Do Stevens' IPV6_PKTOPTIONS.
1258
1259 Yes, guys, it is the only place in our code, where we
1260 may make it not affecting IPv4.
1261 The rest of code is protocol independent,
1262 and I do not like idea to uglify IPv4.
1263
1264 Actually, all the idea behind IPV6_PKTOPTIONS
1265 looks not very well thought. For now we latch
1266 options, received in the last packet, enqueued
1267 by tcp. Feel free to propose better solution.
1268 --ANK (980728)
1269 */
1270 if (np->rxopt.all)
1271 opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
1272
1273 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1274 struct dst_entry *dst = sk->sk_rx_dst;
1275
1276 sock_rps_save_rxhash(sk, skb);
1277 sk_mark_napi_id(sk, skb);
1278 if (dst) {
1279 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1280 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1281 dst_release(dst);
1282 sk->sk_rx_dst = NULL;
1283 }
1284 }
1285
1286 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1287 if (opt_skb)
1288 goto ipv6_pktoptions;
1289 return 0;
1290 }
1291
1292 if (tcp_checksum_complete(skb))
1293 goto csum_err;
1294
1295 if (sk->sk_state == TCP_LISTEN) {
1296 struct sock *nsk = tcp_v6_cookie_check(sk, skb);
1297
1298 if (!nsk)
1299 goto discard;
1300
1301 if (nsk != sk) {
1302 sock_rps_save_rxhash(nsk, skb);
1303 sk_mark_napi_id(nsk, skb);
1304 if (tcp_child_process(sk, nsk, skb))
1305 goto reset;
1306 if (opt_skb)
1307 __kfree_skb(opt_skb);
1308 return 0;
1309 }
1310 } else
1311 sock_rps_save_rxhash(sk, skb);
1312
1313 if (tcp_rcv_state_process(sk, skb))
1314 goto reset;
1315 if (opt_skb)
1316 goto ipv6_pktoptions;
1317 return 0;
1318
1319 reset:
1320 tcp_v6_send_reset(sk, skb);
1321 discard:
1322 if (opt_skb)
1323 __kfree_skb(opt_skb);
1324 kfree_skb(skb);
1325 return 0;
1326 csum_err:
1327 TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS);
1328 TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS);
1329 goto discard;
1330
1331
1332 ipv6_pktoptions:
1333 /* Do you ask, what is it?
1334
1335 1. skb was enqueued by tcp.
1336 2. skb is added to tail of read queue, rather than out of order.
1337 3. socket is not in passive state.
1338 4. Finally, it really contains options, which user wants to receive.
1339 */
1340 tp = tcp_sk(sk);
1341 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1342 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1343 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1344 np->mcast_oif = tcp_v6_iif(opt_skb);
1345 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1346 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1347 if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass)
1348 np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb));
1349 if (np->repflow)
1350 np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb));
1351 if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) {
1352 skb_set_owner_r(opt_skb, sk);
1353 tcp_v6_restore_cb(opt_skb);
1354 opt_skb = xchg(&np->pktoptions, opt_skb);
1355 } else {
1356 __kfree_skb(opt_skb);
1357 opt_skb = xchg(&np->pktoptions, NULL);
1358 }
1359 }
1360
1361 kfree_skb(opt_skb);
1362 return 0;
1363 }
1364
1365 static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
1366 const struct tcphdr *th)
1367 {
1368 /* This is tricky: we move IP6CB at its correct location into
1369 * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because
1370 * _decode_session6() uses IP6CB().
1371 * barrier() makes sure compiler won't play aliasing games.
1372 */
1373 memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb),
1374 sizeof(struct inet6_skb_parm));
1375 barrier();
1376
1377 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1378 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1379 skb->len - th->doff*4);
1380 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1381 TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
1382 TCP_SKB_CB(skb)->tcp_tw_isn = 0;
1383 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1384 TCP_SKB_CB(skb)->sacked = 0;
1385 }
1386
1387 static int tcp_v6_rcv(struct sk_buff *skb)
1388 {
1389 const struct tcphdr *th;
1390 const struct ipv6hdr *hdr;
1391 bool refcounted;
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(net, TCP_MIB_INSEGS);
1403
1404 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1405 goto discard_it;
1406
1407 th = (const struct tcphdr *)skb->data;
1408
1409 if (unlikely(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 = (const struct tcphdr *)skb->data;
1418 hdr = ipv6_hdr(skb);
1419
1420 lookup:
1421 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th),
1422 th->source, th->dest, inet6_iif(skb),
1423 &refcounted);
1424 if (!sk)
1425 goto no_tcp_socket;
1426
1427 process:
1428 if (sk->sk_state == TCP_TIME_WAIT)
1429 goto do_time_wait;
1430
1431 if (sk->sk_state == TCP_NEW_SYN_RECV) {
1432 struct request_sock *req = inet_reqsk(sk);
1433 struct sock *nsk;
1434
1435 sk = req->rsk_listener;
1436 tcp_v6_fill_cb(skb, hdr, th);
1437 if (tcp_v6_inbound_md5_hash(sk, skb)) {
1438 sk_drops_add(sk, skb);
1439 reqsk_put(req);
1440 goto discard_it;
1441 }
1442 if (unlikely(sk->sk_state != TCP_LISTEN)) {
1443 inet_csk_reqsk_queue_drop_and_put(sk, req);
1444 goto lookup;
1445 }
1446 sock_hold(sk);
1447 refcounted = true;
1448 nsk = tcp_check_req(sk, skb, req, false);
1449 if (!nsk) {
1450 reqsk_put(req);
1451 goto discard_and_relse;
1452 }
1453 if (nsk == sk) {
1454 reqsk_put(req);
1455 tcp_v6_restore_cb(skb);
1456 } else if (tcp_child_process(sk, nsk, skb)) {
1457 tcp_v6_send_reset(nsk, skb);
1458 goto discard_and_relse;
1459 } else {
1460 sock_put(sk);
1461 return 0;
1462 }
1463 }
1464 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1465 __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP);
1466 goto discard_and_relse;
1467 }
1468
1469 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1470 goto discard_and_relse;
1471
1472 tcp_v6_fill_cb(skb, hdr, th);
1473
1474 if (tcp_v6_inbound_md5_hash(sk, skb))
1475 goto discard_and_relse;
1476
1477 if (tcp_filter(sk, skb))
1478 goto discard_and_relse;
1479 th = (const struct tcphdr *)skb->data;
1480 hdr = ipv6_hdr(skb);
1481
1482 skb->dev = NULL;
1483
1484 if (sk->sk_state == TCP_LISTEN) {
1485 ret = tcp_v6_do_rcv(sk, skb);
1486 goto put_and_return;
1487 }
1488
1489 sk_incoming_cpu_update(sk);
1490
1491 bh_lock_sock_nested(sk);
1492 tcp_segs_in(tcp_sk(sk), skb);
1493 ret = 0;
1494 if (!sock_owned_by_user(sk)) {
1495 if (!tcp_prequeue(sk, skb))
1496 ret = tcp_v6_do_rcv(sk, skb);
1497 } else if (tcp_add_backlog(sk, skb)) {
1498 goto discard_and_relse;
1499 }
1500 bh_unlock_sock(sk);
1501
1502 put_and_return:
1503 if (refcounted)
1504 sock_put(sk);
1505 return ret ? -1 : 0;
1506
1507 no_tcp_socket:
1508 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1509 goto discard_it;
1510
1511 tcp_v6_fill_cb(skb, hdr, th);
1512
1513 if (tcp_checksum_complete(skb)) {
1514 csum_error:
1515 __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS);
1516 bad_packet:
1517 __TCP_INC_STATS(net, TCP_MIB_INERRS);
1518 } else {
1519 tcp_v6_send_reset(NULL, skb);
1520 }
1521
1522 discard_it:
1523 kfree_skb(skb);
1524 return 0;
1525
1526 discard_and_relse:
1527 sk_drops_add(sk, skb);
1528 if (refcounted)
1529 sock_put(sk);
1530 goto discard_it;
1531
1532 do_time_wait:
1533 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1534 inet_twsk_put(inet_twsk(sk));
1535 goto discard_it;
1536 }
1537
1538 tcp_v6_fill_cb(skb, hdr, th);
1539
1540 if (tcp_checksum_complete(skb)) {
1541 inet_twsk_put(inet_twsk(sk));
1542 goto csum_error;
1543 }
1544
1545 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1546 case TCP_TW_SYN:
1547 {
1548 struct sock *sk2;
1549
1550 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1551 skb, __tcp_hdrlen(th),
1552 &ipv6_hdr(skb)->saddr, th->source,
1553 &ipv6_hdr(skb)->daddr,
1554 ntohs(th->dest), tcp_v6_iif(skb));
1555 if (sk2) {
1556 struct inet_timewait_sock *tw = inet_twsk(sk);
1557 inet_twsk_deschedule_put(tw);
1558 sk = sk2;
1559 tcp_v6_restore_cb(skb);
1560 refcounted = false;
1561 goto process;
1562 }
1563 /* Fall through to ACK */
1564 }
1565 case TCP_TW_ACK:
1566 tcp_v6_timewait_ack(sk, skb);
1567 break;
1568 case TCP_TW_RST:
1569 tcp_v6_restore_cb(skb);
1570 tcp_v6_send_reset(sk, skb);
1571 inet_twsk_deschedule_put(inet_twsk(sk));
1572 goto discard_it;
1573 case TCP_TW_SUCCESS:
1574 ;
1575 }
1576 goto discard_it;
1577 }
1578
1579 static void tcp_v6_early_demux(struct sk_buff *skb)
1580 {
1581 const struct ipv6hdr *hdr;
1582 const struct tcphdr *th;
1583 struct sock *sk;
1584
1585 if (skb->pkt_type != PACKET_HOST)
1586 return;
1587
1588 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1589 return;
1590
1591 hdr = ipv6_hdr(skb);
1592 th = tcp_hdr(skb);
1593
1594 if (th->doff < sizeof(struct tcphdr) / 4)
1595 return;
1596
1597 /* Note : We use inet6_iif() here, not tcp_v6_iif() */
1598 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1599 &hdr->saddr, th->source,
1600 &hdr->daddr, ntohs(th->dest),
1601 inet6_iif(skb));
1602 if (sk) {
1603 skb->sk = sk;
1604 skb->destructor = sock_edemux;
1605 if (sk_fullsock(sk)) {
1606 struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst);
1607
1608 if (dst)
1609 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1610 if (dst &&
1611 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1612 skb_dst_set_noref(skb, dst);
1613 }
1614 }
1615 }
1616
1617 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1618 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1619 .twsk_unique = tcp_twsk_unique,
1620 .twsk_destructor = tcp_twsk_destructor,
1621 };
1622
1623 static const struct inet_connection_sock_af_ops ipv6_specific = {
1624 .queue_xmit = inet6_csk_xmit,
1625 .send_check = tcp_v6_send_check,
1626 .rebuild_header = inet6_sk_rebuild_header,
1627 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1628 .conn_request = tcp_v6_conn_request,
1629 .syn_recv_sock = tcp_v6_syn_recv_sock,
1630 .net_header_len = sizeof(struct ipv6hdr),
1631 .net_frag_header_len = sizeof(struct frag_hdr),
1632 .setsockopt = ipv6_setsockopt,
1633 .getsockopt = ipv6_getsockopt,
1634 .addr2sockaddr = inet6_csk_addr2sockaddr,
1635 .sockaddr_len = sizeof(struct sockaddr_in6),
1636 #ifdef CONFIG_COMPAT
1637 .compat_setsockopt = compat_ipv6_setsockopt,
1638 .compat_getsockopt = compat_ipv6_getsockopt,
1639 #endif
1640 .mtu_reduced = tcp_v6_mtu_reduced,
1641 };
1642
1643 #ifdef CONFIG_TCP_MD5SIG
1644 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1645 .md5_lookup = tcp_v6_md5_lookup,
1646 .calc_md5_hash = tcp_v6_md5_hash_skb,
1647 .md5_parse = tcp_v6_parse_md5_keys,
1648 };
1649 #endif
1650
1651 /*
1652 * TCP over IPv4 via INET6 API
1653 */
1654 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1655 .queue_xmit = ip_queue_xmit,
1656 .send_check = tcp_v4_send_check,
1657 .rebuild_header = inet_sk_rebuild_header,
1658 .sk_rx_dst_set = inet_sk_rx_dst_set,
1659 .conn_request = tcp_v6_conn_request,
1660 .syn_recv_sock = tcp_v6_syn_recv_sock,
1661 .net_header_len = sizeof(struct iphdr),
1662 .setsockopt = ipv6_setsockopt,
1663 .getsockopt = ipv6_getsockopt,
1664 .addr2sockaddr = inet6_csk_addr2sockaddr,
1665 .sockaddr_len = sizeof(struct sockaddr_in6),
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_REO_TIMEOUT ||
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 .keepalive = tcp_set_keepalive,
1903 .recvmsg = tcp_recvmsg,
1904 .sendmsg = tcp_sendmsg,
1905 .sendpage = tcp_sendpage,
1906 .backlog_rcv = tcp_v6_do_rcv,
1907 .release_cb = tcp_release_cb,
1908 .hash = inet6_hash,
1909 .unhash = inet_unhash,
1910 .get_port = inet_csk_get_port,
1911 .enter_memory_pressure = tcp_enter_memory_pressure,
1912 .stream_memory_free = tcp_stream_memory_free,
1913 .sockets_allocated = &tcp_sockets_allocated,
1914 .memory_allocated = &tcp_memory_allocated,
1915 .memory_pressure = &tcp_memory_pressure,
1916 .orphan_count = &tcp_orphan_count,
1917 .sysctl_mem = sysctl_tcp_mem,
1918 .sysctl_wmem = sysctl_tcp_wmem,
1919 .sysctl_rmem = sysctl_tcp_rmem,
1920 .max_header = MAX_TCP_HEADER,
1921 .obj_size = sizeof(struct tcp6_sock),
1922 .slab_flags = SLAB_DESTROY_BY_RCU,
1923 .twsk_prot = &tcp6_timewait_sock_ops,
1924 .rsk_prot = &tcp6_request_sock_ops,
1925 .h.hashinfo = &tcp_hashinfo,
1926 .no_autobind = true,
1927 #ifdef CONFIG_COMPAT
1928 .compat_setsockopt = compat_tcp_setsockopt,
1929 .compat_getsockopt = compat_tcp_getsockopt,
1930 #endif
1931 .diag_destroy = tcp_abort,
1932 };
1933
1934 static const struct inet6_protocol tcpv6_protocol = {
1935 .early_demux = tcp_v6_early_demux,
1936 .handler = tcp_v6_rcv,
1937 .err_handler = tcp_v6_err,
1938 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1939 };
1940
1941 static struct inet_protosw tcpv6_protosw = {
1942 .type = SOCK_STREAM,
1943 .protocol = IPPROTO_TCP,
1944 .prot = &tcpv6_prot,
1945 .ops = &inet6_stream_ops,
1946 .flags = INET_PROTOSW_PERMANENT |
1947 INET_PROTOSW_ICSK,
1948 };
1949
1950 static int __net_init tcpv6_net_init(struct net *net)
1951 {
1952 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1953 SOCK_RAW, IPPROTO_TCP, net);
1954 }
1955
1956 static void __net_exit tcpv6_net_exit(struct net *net)
1957 {
1958 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1959 }
1960
1961 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1962 {
1963 inet_twsk_purge(&tcp_hashinfo, AF_INET6);
1964 }
1965
1966 static struct pernet_operations tcpv6_net_ops = {
1967 .init = tcpv6_net_init,
1968 .exit = tcpv6_net_exit,
1969 .exit_batch = tcpv6_net_exit_batch,
1970 };
1971
1972 int __init tcpv6_init(void)
1973 {
1974 int ret;
1975
1976 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1977 if (ret)
1978 goto out;
1979
1980 /* register inet6 protocol */
1981 ret = inet6_register_protosw(&tcpv6_protosw);
1982 if (ret)
1983 goto out_tcpv6_protocol;
1984
1985 ret = register_pernet_subsys(&tcpv6_net_ops);
1986 if (ret)
1987 goto out_tcpv6_protosw;
1988 out:
1989 return ret;
1990
1991 out_tcpv6_protosw:
1992 inet6_unregister_protosw(&tcpv6_protosw);
1993 out_tcpv6_protocol:
1994 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1995 goto out;
1996 }
1997
1998 void tcpv6_exit(void)
1999 {
2000 unregister_pernet_subsys(&tcpv6_net_ops);
2001 inet6_unregister_protosw(&tcpv6_protosw);
2002 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2003 }
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