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Merge remote-tracking branch 'asoc/topic/intel' into asoc-next
[mirror_ubuntu-bionic-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_seq(const struct sk_buff *skb)
105 {
106 return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32,
107 ipv6_hdr(skb)->saddr.s6_addr32,
108 tcp_hdr(skb)->dest,
109 tcp_hdr(skb)->source);
110 }
111
112 static u32 tcp_v6_init_ts_off(const struct sk_buff *skb)
113 {
114 return secure_tcpv6_ts_off(ipv6_hdr(skb)->daddr.s6_addr32,
115 ipv6_hdr(skb)->saddr.s6_addr32);
116 }
117
118 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
119 int addr_len)
120 {
121 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
122 struct inet_sock *inet = inet_sk(sk);
123 struct inet_connection_sock *icsk = inet_csk(sk);
124 struct ipv6_pinfo *np = inet6_sk(sk);
125 struct tcp_sock *tp = tcp_sk(sk);
126 struct in6_addr *saddr = NULL, *final_p, final;
127 struct ipv6_txoptions *opt;
128 struct flowi6 fl6;
129 struct dst_entry *dst;
130 int addr_type;
131 int err;
132 struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row;
133
134 if (addr_len < SIN6_LEN_RFC2133)
135 return -EINVAL;
136
137 if (usin->sin6_family != AF_INET6)
138 return -EAFNOSUPPORT;
139
140 memset(&fl6, 0, sizeof(fl6));
141
142 if (np->sndflow) {
143 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
144 IP6_ECN_flow_init(fl6.flowlabel);
145 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
146 struct ip6_flowlabel *flowlabel;
147 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
148 if (!flowlabel)
149 return -EINVAL;
150 fl6_sock_release(flowlabel);
151 }
152 }
153
154 /*
155 * connect() to INADDR_ANY means loopback (BSD'ism).
156 */
157
158 if (ipv6_addr_any(&usin->sin6_addr)) {
159 if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr))
160 ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
161 &usin->sin6_addr);
162 else
163 usin->sin6_addr = in6addr_loopback;
164 }
165
166 addr_type = ipv6_addr_type(&usin->sin6_addr);
167
168 if (addr_type & IPV6_ADDR_MULTICAST)
169 return -ENETUNREACH;
170
171 if (addr_type&IPV6_ADDR_LINKLOCAL) {
172 if (addr_len >= sizeof(struct sockaddr_in6) &&
173 usin->sin6_scope_id) {
174 /* If interface is set while binding, indices
175 * must coincide.
176 */
177 if (sk->sk_bound_dev_if &&
178 sk->sk_bound_dev_if != usin->sin6_scope_id)
179 return -EINVAL;
180
181 sk->sk_bound_dev_if = usin->sin6_scope_id;
182 }
183
184 /* Connect to link-local address requires an interface */
185 if (!sk->sk_bound_dev_if)
186 return -EINVAL;
187 }
188
189 if (tp->rx_opt.ts_recent_stamp &&
190 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
191 tp->rx_opt.ts_recent = 0;
192 tp->rx_opt.ts_recent_stamp = 0;
193 tp->write_seq = 0;
194 }
195
196 sk->sk_v6_daddr = usin->sin6_addr;
197 np->flow_label = fl6.flowlabel;
198
199 /*
200 * TCP over IPv4
201 */
202
203 if (addr_type & IPV6_ADDR_MAPPED) {
204 u32 exthdrlen = icsk->icsk_ext_hdr_len;
205 struct sockaddr_in sin;
206
207 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
208
209 if (__ipv6_only_sock(sk))
210 return -ENETUNREACH;
211
212 sin.sin_family = AF_INET;
213 sin.sin_port = usin->sin6_port;
214 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
215
216 icsk->icsk_af_ops = &ipv6_mapped;
217 sk->sk_backlog_rcv = tcp_v4_do_rcv;
218 #ifdef CONFIG_TCP_MD5SIG
219 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
220 #endif
221
222 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
223
224 if (err) {
225 icsk->icsk_ext_hdr_len = exthdrlen;
226 icsk->icsk_af_ops = &ipv6_specific;
227 sk->sk_backlog_rcv = tcp_v6_do_rcv;
228 #ifdef CONFIG_TCP_MD5SIG
229 tp->af_specific = &tcp_sock_ipv6_specific;
230 #endif
231 goto failure;
232 }
233 np->saddr = sk->sk_v6_rcv_saddr;
234
235 return err;
236 }
237
238 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
239 saddr = &sk->sk_v6_rcv_saddr;
240
241 fl6.flowi6_proto = IPPROTO_TCP;
242 fl6.daddr = sk->sk_v6_daddr;
243 fl6.saddr = saddr ? *saddr : np->saddr;
244 fl6.flowi6_oif = sk->sk_bound_dev_if;
245 fl6.flowi6_mark = sk->sk_mark;
246 fl6.fl6_dport = usin->sin6_port;
247 fl6.fl6_sport = inet->inet_sport;
248 fl6.flowi6_uid = sk->sk_uid;
249
250 opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk));
251 final_p = fl6_update_dst(&fl6, opt, &final);
252
253 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
254
255 dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
256 if (IS_ERR(dst)) {
257 err = PTR_ERR(dst);
258 goto failure;
259 }
260
261 if (!saddr) {
262 saddr = &fl6.saddr;
263 sk->sk_v6_rcv_saddr = *saddr;
264 }
265
266 /* set the source address */
267 np->saddr = *saddr;
268 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
269
270 sk->sk_gso_type = SKB_GSO_TCPV6;
271 ip6_dst_store(sk, dst, NULL, NULL);
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 if (!tp->write_seq)
291 tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32,
292 sk->sk_v6_daddr.s6_addr32,
293 inet->inet_sport,
294 inet->inet_dport);
295 tp->tsoffset = secure_tcpv6_ts_off(np->saddr.s6_addr32,
296 sk->sk_v6_daddr.s6_addr32);
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 if (!sock_owned_by_user(sk)) {
395 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
396
397 if (dst)
398 dst->ops->redirect(dst, sk, skb);
399 }
400 goto out;
401 }
402
403 if (type == ICMPV6_PKT_TOOBIG) {
404 /* We are not interested in TCP_LISTEN and open_requests
405 * (SYN-ACKs send out by Linux are always <576bytes so
406 * they should go through unfragmented).
407 */
408 if (sk->sk_state == TCP_LISTEN)
409 goto out;
410
411 if (!ip6_sk_accept_pmtu(sk))
412 goto out;
413
414 tp->mtu_info = ntohl(info);
415 if (!sock_owned_by_user(sk))
416 tcp_v6_mtu_reduced(sk);
417 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
418 &sk->sk_tsq_flags))
419 sock_hold(sk);
420 goto out;
421 }
422
423
424 /* Might be for an request_sock */
425 switch (sk->sk_state) {
426 case TCP_SYN_SENT:
427 case TCP_SYN_RECV:
428 /* Only in fast or simultaneous open. If a fast open socket is
429 * is already accepted it is treated as a connected one below.
430 */
431 if (fastopen && !fastopen->sk)
432 break;
433
434 if (!sock_owned_by_user(sk)) {
435 sk->sk_err = err;
436 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
437
438 tcp_done(sk);
439 } else
440 sk->sk_err_soft = err;
441 goto out;
442 }
443
444 if (!sock_owned_by_user(sk) && np->recverr) {
445 sk->sk_err = err;
446 sk->sk_error_report(sk);
447 } else
448 sk->sk_err_soft = err;
449
450 out:
451 bh_unlock_sock(sk);
452 sock_put(sk);
453 }
454
455
456 static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
457 struct flowi *fl,
458 struct request_sock *req,
459 struct tcp_fastopen_cookie *foc,
460 enum tcp_synack_type synack_type)
461 {
462 struct inet_request_sock *ireq = inet_rsk(req);
463 struct ipv6_pinfo *np = inet6_sk(sk);
464 struct ipv6_txoptions *opt;
465 struct flowi6 *fl6 = &fl->u.ip6;
466 struct sk_buff *skb;
467 int err = -ENOMEM;
468
469 /* First, grab a route. */
470 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req,
471 IPPROTO_TCP)) == NULL)
472 goto done;
473
474 skb = tcp_make_synack(sk, dst, req, foc, synack_type);
475
476 if (skb) {
477 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
478 &ireq->ir_v6_rmt_addr);
479
480 fl6->daddr = ireq->ir_v6_rmt_addr;
481 if (np->repflow && ireq->pktopts)
482 fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
483
484 rcu_read_lock();
485 opt = ireq->ipv6_opt;
486 if (!opt)
487 opt = rcu_dereference(np->opt);
488 err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass);
489 rcu_read_unlock();
490 err = net_xmit_eval(err);
491 }
492
493 done:
494 return err;
495 }
496
497
498 static void tcp_v6_reqsk_destructor(struct request_sock *req)
499 {
500 kfree(inet_rsk(req)->ipv6_opt);
501 kfree_skb(inet_rsk(req)->pktopts);
502 }
503
504 #ifdef CONFIG_TCP_MD5SIG
505 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
506 const struct in6_addr *addr)
507 {
508 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
509 }
510
511 static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
512 const struct sock *addr_sk)
513 {
514 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
515 }
516
517 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
518 int optlen)
519 {
520 struct tcp_md5sig cmd;
521 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
522
523 if (optlen < sizeof(cmd))
524 return -EINVAL;
525
526 if (copy_from_user(&cmd, optval, sizeof(cmd)))
527 return -EFAULT;
528
529 if (sin6->sin6_family != AF_INET6)
530 return -EINVAL;
531
532 if (!cmd.tcpm_keylen) {
533 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
534 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
535 AF_INET);
536 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
537 AF_INET6);
538 }
539
540 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
541 return -EINVAL;
542
543 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
544 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
545 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
546
547 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
548 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
549 }
550
551 static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
552 const struct in6_addr *daddr,
553 const struct in6_addr *saddr,
554 const struct tcphdr *th, int nbytes)
555 {
556 struct tcp6_pseudohdr *bp;
557 struct scatterlist sg;
558 struct tcphdr *_th;
559
560 bp = hp->scratch;
561 /* 1. TCP pseudo-header (RFC2460) */
562 bp->saddr = *saddr;
563 bp->daddr = *daddr;
564 bp->protocol = cpu_to_be32(IPPROTO_TCP);
565 bp->len = cpu_to_be32(nbytes);
566
567 _th = (struct tcphdr *)(bp + 1);
568 memcpy(_th, th, sizeof(*th));
569 _th->check = 0;
570
571 sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
572 ahash_request_set_crypt(hp->md5_req, &sg, NULL,
573 sizeof(*bp) + sizeof(*th));
574 return crypto_ahash_update(hp->md5_req);
575 }
576
577 static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
578 const struct in6_addr *daddr, struct in6_addr *saddr,
579 const struct tcphdr *th)
580 {
581 struct tcp_md5sig_pool *hp;
582 struct ahash_request *req;
583
584 hp = tcp_get_md5sig_pool();
585 if (!hp)
586 goto clear_hash_noput;
587 req = hp->md5_req;
588
589 if (crypto_ahash_init(req))
590 goto clear_hash;
591 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
592 goto clear_hash;
593 if (tcp_md5_hash_key(hp, key))
594 goto clear_hash;
595 ahash_request_set_crypt(req, NULL, md5_hash, 0);
596 if (crypto_ahash_final(req))
597 goto clear_hash;
598
599 tcp_put_md5sig_pool();
600 return 0;
601
602 clear_hash:
603 tcp_put_md5sig_pool();
604 clear_hash_noput:
605 memset(md5_hash, 0, 16);
606 return 1;
607 }
608
609 static int tcp_v6_md5_hash_skb(char *md5_hash,
610 const struct tcp_md5sig_key *key,
611 const struct sock *sk,
612 const struct sk_buff *skb)
613 {
614 const struct in6_addr *saddr, *daddr;
615 struct tcp_md5sig_pool *hp;
616 struct ahash_request *req;
617 const struct tcphdr *th = tcp_hdr(skb);
618
619 if (sk) { /* valid for establish/request sockets */
620 saddr = &sk->sk_v6_rcv_saddr;
621 daddr = &sk->sk_v6_daddr;
622 } else {
623 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
624 saddr = &ip6h->saddr;
625 daddr = &ip6h->daddr;
626 }
627
628 hp = tcp_get_md5sig_pool();
629 if (!hp)
630 goto clear_hash_noput;
631 req = hp->md5_req;
632
633 if (crypto_ahash_init(req))
634 goto clear_hash;
635
636 if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
637 goto clear_hash;
638 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
639 goto clear_hash;
640 if (tcp_md5_hash_key(hp, key))
641 goto clear_hash;
642 ahash_request_set_crypt(req, NULL, md5_hash, 0);
643 if (crypto_ahash_final(req))
644 goto clear_hash;
645
646 tcp_put_md5sig_pool();
647 return 0;
648
649 clear_hash:
650 tcp_put_md5sig_pool();
651 clear_hash_noput:
652 memset(md5_hash, 0, 16);
653 return 1;
654 }
655
656 #endif
657
658 static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
659 const struct sk_buff *skb)
660 {
661 #ifdef CONFIG_TCP_MD5SIG
662 const __u8 *hash_location = NULL;
663 struct tcp_md5sig_key *hash_expected;
664 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
665 const struct tcphdr *th = tcp_hdr(skb);
666 int genhash;
667 u8 newhash[16];
668
669 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
670 hash_location = tcp_parse_md5sig_option(th);
671
672 /* We've parsed the options - do we have a hash? */
673 if (!hash_expected && !hash_location)
674 return false;
675
676 if (hash_expected && !hash_location) {
677 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
678 return true;
679 }
680
681 if (!hash_expected && hash_location) {
682 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
683 return true;
684 }
685
686 /* check the signature */
687 genhash = tcp_v6_md5_hash_skb(newhash,
688 hash_expected,
689 NULL, skb);
690
691 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
692 NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
693 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
694 genhash ? "failed" : "mismatch",
695 &ip6h->saddr, ntohs(th->source),
696 &ip6h->daddr, ntohs(th->dest));
697 return true;
698 }
699 #endif
700 return false;
701 }
702
703 static void tcp_v6_init_req(struct request_sock *req,
704 const struct sock *sk_listener,
705 struct sk_buff *skb)
706 {
707 struct inet_request_sock *ireq = inet_rsk(req);
708 const struct ipv6_pinfo *np = inet6_sk(sk_listener);
709
710 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
711 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
712
713 /* So that link locals have meaning */
714 if (!sk_listener->sk_bound_dev_if &&
715 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
716 ireq->ir_iif = tcp_v6_iif(skb);
717
718 if (!TCP_SKB_CB(skb)->tcp_tw_isn &&
719 (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) ||
720 np->rxopt.bits.rxinfo ||
721 np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim ||
722 np->rxopt.bits.rxohlim || np->repflow)) {
723 atomic_inc(&skb->users);
724 ireq->pktopts = skb;
725 }
726 }
727
728 static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
729 struct flowi *fl,
730 const struct request_sock *req)
731 {
732 return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP);
733 }
734
735 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
736 .family = AF_INET6,
737 .obj_size = sizeof(struct tcp6_request_sock),
738 .rtx_syn_ack = tcp_rtx_synack,
739 .send_ack = tcp_v6_reqsk_send_ack,
740 .destructor = tcp_v6_reqsk_destructor,
741 .send_reset = tcp_v6_send_reset,
742 .syn_ack_timeout = tcp_syn_ack_timeout,
743 };
744
745 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
746 .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) -
747 sizeof(struct ipv6hdr),
748 #ifdef CONFIG_TCP_MD5SIG
749 .req_md5_lookup = tcp_v6_md5_lookup,
750 .calc_md5_hash = tcp_v6_md5_hash_skb,
751 #endif
752 .init_req = tcp_v6_init_req,
753 #ifdef CONFIG_SYN_COOKIES
754 .cookie_init_seq = cookie_v6_init_sequence,
755 #endif
756 .route_req = tcp_v6_route_req,
757 .init_seq = tcp_v6_init_seq,
758 .init_ts_off = tcp_v6_init_ts_off,
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_mc_list = NULL;
1066 newnp->ipv6_ac_list = NULL;
1067 newnp->ipv6_fl_list = NULL;
1068 newnp->pktoptions = NULL;
1069 newnp->opt = NULL;
1070 newnp->mcast_oif = tcp_v6_iif(skb);
1071 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1072 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1073 if (np->repflow)
1074 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1075
1076 /*
1077 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1078 * here, tcp_create_openreq_child now does this for us, see the comment in
1079 * that function for the gory details. -acme
1080 */
1081
1082 /* It is tricky place. Until this moment IPv4 tcp
1083 worked with IPv6 icsk.icsk_af_ops.
1084 Sync it now.
1085 */
1086 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1087
1088 return newsk;
1089 }
1090
1091 ireq = inet_rsk(req);
1092
1093 if (sk_acceptq_is_full(sk))
1094 goto out_overflow;
1095
1096 if (!dst) {
1097 dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP);
1098 if (!dst)
1099 goto out;
1100 }
1101
1102 newsk = tcp_create_openreq_child(sk, req, skb);
1103 if (!newsk)
1104 goto out_nonewsk;
1105
1106 /*
1107 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1108 * count here, tcp_create_openreq_child now does this for us, see the
1109 * comment in that function for the gory details. -acme
1110 */
1111
1112 newsk->sk_gso_type = SKB_GSO_TCPV6;
1113 ip6_dst_store(newsk, dst, NULL, NULL);
1114 inet6_sk_rx_dst_set(newsk, skb);
1115
1116 newtcp6sk = (struct tcp6_sock *)newsk;
1117 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1118
1119 newtp = tcp_sk(newsk);
1120 newinet = inet_sk(newsk);
1121 newnp = inet6_sk(newsk);
1122
1123 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1124
1125 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1126 newnp->saddr = ireq->ir_v6_loc_addr;
1127 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1128 newsk->sk_bound_dev_if = ireq->ir_iif;
1129
1130 /* Now IPv6 options...
1131
1132 First: no IPv4 options.
1133 */
1134 newinet->inet_opt = NULL;
1135 newnp->ipv6_mc_list = NULL;
1136 newnp->ipv6_ac_list = NULL;
1137 newnp->ipv6_fl_list = NULL;
1138
1139 /* Clone RX bits */
1140 newnp->rxopt.all = np->rxopt.all;
1141
1142 newnp->pktoptions = NULL;
1143 newnp->opt = NULL;
1144 newnp->mcast_oif = tcp_v6_iif(skb);
1145 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1146 newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb));
1147 if (np->repflow)
1148 newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb));
1149
1150 /* Clone native IPv6 options from listening socket (if any)
1151
1152 Yes, keeping reference count would be much more clever,
1153 but we make one more one thing there: reattach optmem
1154 to newsk.
1155 */
1156 opt = ireq->ipv6_opt;
1157 if (!opt)
1158 opt = rcu_dereference(np->opt);
1159 if (opt) {
1160 opt = ipv6_dup_options(newsk, opt);
1161 RCU_INIT_POINTER(newnp->opt, opt);
1162 }
1163 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1164 if (opt)
1165 inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen +
1166 opt->opt_flen;
1167
1168 tcp_ca_openreq_child(newsk, dst);
1169
1170 tcp_sync_mss(newsk, dst_mtu(dst));
1171 newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst));
1172
1173 tcp_initialize_rcv_mss(newsk);
1174
1175 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1176 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1177
1178 #ifdef CONFIG_TCP_MD5SIG
1179 /* Copy over the MD5 key from the original socket */
1180 key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
1181 if (key) {
1182 /* We're using one, so create a matching key
1183 * on the newsk structure. If we fail to get
1184 * memory, then we end up not copying the key
1185 * across. Shucks.
1186 */
1187 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1188 AF_INET6, key->key, key->keylen,
1189 sk_gfp_mask(sk, GFP_ATOMIC));
1190 }
1191 #endif
1192
1193 if (__inet_inherit_port(sk, newsk) < 0) {
1194 inet_csk_prepare_forced_close(newsk);
1195 tcp_done(newsk);
1196 goto out;
1197 }
1198 *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash));
1199 if (*own_req) {
1200 tcp_move_syn(newtp, req);
1201
1202 /* Clone pktoptions received with SYN, if we own the req */
1203 if (ireq->pktopts) {
1204 newnp->pktoptions = skb_clone(ireq->pktopts,
1205 sk_gfp_mask(sk, GFP_ATOMIC));
1206 consume_skb(ireq->pktopts);
1207 ireq->pktopts = NULL;
1208 if (newnp->pktoptions) {
1209 tcp_v6_restore_cb(newnp->pktoptions);
1210 skb_set_owner_r(newnp->pktoptions, newsk);
1211 }
1212 }
1213 }
1214
1215 return newsk;
1216
1217 out_overflow:
1218 __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1219 out_nonewsk:
1220 dst_release(dst);
1221 out:
1222 tcp_listendrop(sk);
1223 return NULL;
1224 }
1225
1226 /* The socket must have it's spinlock held when we get
1227 * here, unless it is a TCP_LISTEN socket.
1228 *
1229 * We have a potential double-lock case here, so even when
1230 * doing backlog processing we use the BH locking scheme.
1231 * This is because we cannot sleep with the original spinlock
1232 * held.
1233 */
1234 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1235 {
1236 struct ipv6_pinfo *np = inet6_sk(sk);
1237 struct tcp_sock *tp;
1238 struct sk_buff *opt_skb = NULL;
1239
1240 /* Imagine: socket is IPv6. IPv4 packet arrives,
1241 goes to IPv4 receive handler and backlogged.
1242 From backlog it always goes here. Kerboom...
1243 Fortunately, tcp_rcv_established and rcv_established
1244 handle them correctly, but it is not case with
1245 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1246 */
1247
1248 if (skb->protocol == htons(ETH_P_IP))
1249 return tcp_v4_do_rcv(sk, skb);
1250
1251 if (tcp_filter(sk, skb))
1252 goto discard;
1253
1254 /*
1255 * socket locking is here for SMP purposes as backlog rcv
1256 * is currently called with bh processing disabled.
1257 */
1258
1259 /* Do Stevens' IPV6_PKTOPTIONS.
1260
1261 Yes, guys, it is the only place in our code, where we
1262 may make it not affecting IPv4.
1263 The rest of code is protocol independent,
1264 and I do not like idea to uglify IPv4.
1265
1266 Actually, all the idea behind IPV6_PKTOPTIONS
1267 looks not very well thought. For now we latch
1268 options, received in the last packet, enqueued
1269 by tcp. Feel free to propose better solution.
1270 --ANK (980728)
1271 */
1272 if (np->rxopt.all)
1273 opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC));
1274
1275 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1276 struct dst_entry *dst = sk->sk_rx_dst;
1277
1278 sock_rps_save_rxhash(sk, skb);
1279 sk_mark_napi_id(sk, skb);
1280 if (dst) {
1281 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1282 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1283 dst_release(dst);
1284 sk->sk_rx_dst = NULL;
1285 }
1286 }
1287
1288 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1289 if (opt_skb)
1290 goto ipv6_pktoptions;
1291 return 0;
1292 }
1293
1294 if (tcp_checksum_complete(skb))
1295 goto csum_err;
1296
1297 if (sk->sk_state == TCP_LISTEN) {
1298 struct sock *nsk = tcp_v6_cookie_check(sk, skb);
1299
1300 if (!nsk)
1301 goto discard;
1302
1303 if (nsk != sk) {
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_TYPESAFE_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 struct inet6_protocol tcpv6_protocol = {
1935 .early_demux = tcp_v6_early_demux,
1936 .early_demux_handler = tcp_v6_early_demux,
1937 .handler = tcp_v6_rcv,
1938 .err_handler = tcp_v6_err,
1939 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1940 };
1941
1942 static struct inet_protosw tcpv6_protosw = {
1943 .type = SOCK_STREAM,
1944 .protocol = IPPROTO_TCP,
1945 .prot = &tcpv6_prot,
1946 .ops = &inet6_stream_ops,
1947 .flags = INET_PROTOSW_PERMANENT |
1948 INET_PROTOSW_ICSK,
1949 };
1950
1951 static int __net_init tcpv6_net_init(struct net *net)
1952 {
1953 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1954 SOCK_RAW, IPPROTO_TCP, net);
1955 }
1956
1957 static void __net_exit tcpv6_net_exit(struct net *net)
1958 {
1959 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1960 }
1961
1962 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1963 {
1964 inet_twsk_purge(&tcp_hashinfo, AF_INET6);
1965 }
1966
1967 static struct pernet_operations tcpv6_net_ops = {
1968 .init = tcpv6_net_init,
1969 .exit = tcpv6_net_exit,
1970 .exit_batch = tcpv6_net_exit_batch,
1971 };
1972
1973 int __init tcpv6_init(void)
1974 {
1975 int ret;
1976
1977 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1978 if (ret)
1979 goto out;
1980
1981 /* register inet6 protocol */
1982 ret = inet6_register_protosw(&tcpv6_protosw);
1983 if (ret)
1984 goto out_tcpv6_protocol;
1985
1986 ret = register_pernet_subsys(&tcpv6_net_ops);
1987 if (ret)
1988 goto out_tcpv6_protosw;
1989 out:
1990 return ret;
1991
1992 out_tcpv6_protosw:
1993 inet6_unregister_protosw(&tcpv6_protosw);
1994 out_tcpv6_protocol:
1995 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1996 goto out;
1997 }
1998
1999 void tcpv6_exit(void)
2000 {
2001 unregister_pernet_subsys(&tcpv6_net_ops);
2002 inet6_unregister_protosw(&tcpv6_protosw);
2003 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2004 }
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