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inet: includes a sock_common in request_sock
[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
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/netdma.h>
63 #include <net/inet_common.h>
64 #include <net/secure_seq.h>
65 #include <net/tcp_memcontrol.h>
66 #include <net/busy_poll.h>
67
68 #include <asm/uaccess.h>
69
70 #include <linux/proc_fs.h>
71 #include <linux/seq_file.h>
72
73 #include <linux/crypto.h>
74 #include <linux/scatterlist.h>
75
76 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
77 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
78 struct request_sock *req);
79
80 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
81
82 static const struct inet_connection_sock_af_ops ipv6_mapped;
83 static const struct inet_connection_sock_af_ops ipv6_specific;
84 #ifdef CONFIG_TCP_MD5SIG
85 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
86 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
87 #else
88 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
89 const struct in6_addr *addr)
90 {
91 return NULL;
92 }
93 #endif
94
95 static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
96 {
97 struct dst_entry *dst = skb_dst(skb);
98 const struct rt6_info *rt = (const struct rt6_info *)dst;
99
100 dst_hold(dst);
101 sk->sk_rx_dst = dst;
102 inet_sk(sk)->rx_dst_ifindex = skb->skb_iif;
103 if (rt->rt6i_node)
104 inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum;
105 }
106
107 static void tcp_v6_hash(struct sock *sk)
108 {
109 if (sk->sk_state != TCP_CLOSE) {
110 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
111 tcp_prot.hash(sk);
112 return;
113 }
114 local_bh_disable();
115 __inet6_hash(sk, NULL);
116 local_bh_enable();
117 }
118 }
119
120 static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
121 {
122 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
123 ipv6_hdr(skb)->saddr.s6_addr32,
124 tcp_hdr(skb)->dest,
125 tcp_hdr(skb)->source);
126 }
127
128 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
129 int addr_len)
130 {
131 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
132 struct inet_sock *inet = inet_sk(sk);
133 struct inet_connection_sock *icsk = inet_csk(sk);
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct tcp_sock *tp = tcp_sk(sk);
136 struct in6_addr *saddr = NULL, *final_p, final;
137 struct rt6_info *rt;
138 struct flowi6 fl6;
139 struct dst_entry *dst;
140 int addr_type;
141 int err;
142
143 if (addr_len < SIN6_LEN_RFC2133)
144 return -EINVAL;
145
146 if (usin->sin6_family != AF_INET6)
147 return -EAFNOSUPPORT;
148
149 memset(&fl6, 0, sizeof(fl6));
150
151 if (np->sndflow) {
152 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
153 IP6_ECN_flow_init(fl6.flowlabel);
154 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
155 struct ip6_flowlabel *flowlabel;
156 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
157 if (flowlabel == NULL)
158 return -EINVAL;
159 usin->sin6_addr = flowlabel->dst;
160 fl6_sock_release(flowlabel);
161 }
162 }
163
164 /*
165 * connect() to INADDR_ANY means loopback (BSD'ism).
166 */
167
168 if(ipv6_addr_any(&usin->sin6_addr))
169 usin->sin6_addr.s6_addr[15] = 0x1;
170
171 addr_type = ipv6_addr_type(&usin->sin6_addr);
172
173 if(addr_type & IPV6_ADDR_MULTICAST)
174 return -ENETUNREACH;
175
176 if (addr_type&IPV6_ADDR_LINKLOCAL) {
177 if (addr_len >= sizeof(struct sockaddr_in6) &&
178 usin->sin6_scope_id) {
179 /* If interface is set while binding, indices
180 * must coincide.
181 */
182 if (sk->sk_bound_dev_if &&
183 sk->sk_bound_dev_if != usin->sin6_scope_id)
184 return -EINVAL;
185
186 sk->sk_bound_dev_if = usin->sin6_scope_id;
187 }
188
189 /* Connect to link-local address requires an interface */
190 if (!sk->sk_bound_dev_if)
191 return -EINVAL;
192 }
193
194 if (tp->rx_opt.ts_recent_stamp &&
195 !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) {
196 tp->rx_opt.ts_recent = 0;
197 tp->rx_opt.ts_recent_stamp = 0;
198 tp->write_seq = 0;
199 }
200
201 sk->sk_v6_daddr = usin->sin6_addr;
202 np->flow_label = fl6.flowlabel;
203
204 /*
205 * TCP over IPv4
206 */
207
208 if (addr_type == IPV6_ADDR_MAPPED) {
209 u32 exthdrlen = icsk->icsk_ext_hdr_len;
210 struct sockaddr_in sin;
211
212 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
213
214 if (__ipv6_only_sock(sk))
215 return -ENETUNREACH;
216
217 sin.sin_family = AF_INET;
218 sin.sin_port = usin->sin6_port;
219 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
220
221 icsk->icsk_af_ops = &ipv6_mapped;
222 sk->sk_backlog_rcv = tcp_v4_do_rcv;
223 #ifdef CONFIG_TCP_MD5SIG
224 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
225 #endif
226
227 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
228
229 if (err) {
230 icsk->icsk_ext_hdr_len = exthdrlen;
231 icsk->icsk_af_ops = &ipv6_specific;
232 sk->sk_backlog_rcv = tcp_v6_do_rcv;
233 #ifdef CONFIG_TCP_MD5SIG
234 tp->af_specific = &tcp_sock_ipv6_specific;
235 #endif
236 goto failure;
237 } else {
238 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
239 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
240 &sk->sk_v6_rcv_saddr);
241 }
242
243 return err;
244 }
245
246 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr))
247 saddr = &sk->sk_v6_rcv_saddr;
248
249 fl6.flowi6_proto = IPPROTO_TCP;
250 fl6.daddr = sk->sk_v6_daddr;
251 fl6.saddr = saddr ? *saddr : np->saddr;
252 fl6.flowi6_oif = sk->sk_bound_dev_if;
253 fl6.flowi6_mark = sk->sk_mark;
254 fl6.fl6_dport = usin->sin6_port;
255 fl6.fl6_sport = inet->inet_sport;
256
257 final_p = fl6_update_dst(&fl6, np->opt, &final);
258
259 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
260
261 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
262 if (IS_ERR(dst)) {
263 err = PTR_ERR(dst);
264 goto failure;
265 }
266
267 if (saddr == NULL) {
268 saddr = &fl6.saddr;
269 sk->sk_v6_rcv_saddr = *saddr;
270 }
271
272 /* set the source address */
273 np->saddr = *saddr;
274 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
275
276 sk->sk_gso_type = SKB_GSO_TCPV6;
277 __ip6_dst_store(sk, dst, NULL, NULL);
278
279 rt = (struct rt6_info *) dst;
280 if (tcp_death_row.sysctl_tw_recycle &&
281 !tp->rx_opt.ts_recent_stamp &&
282 ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr))
283 tcp_fetch_timewait_stamp(sk, dst);
284
285 icsk->icsk_ext_hdr_len = 0;
286 if (np->opt)
287 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
288 np->opt->opt_nflen);
289
290 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
291
292 inet->inet_dport = usin->sin6_port;
293
294 tcp_set_state(sk, TCP_SYN_SENT);
295 err = inet6_hash_connect(&tcp_death_row, sk);
296 if (err)
297 goto late_failure;
298
299 if (!tp->write_seq && likely(!tp->repair))
300 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
301 sk->sk_v6_daddr.s6_addr32,
302 inet->inet_sport,
303 inet->inet_dport);
304
305 err = tcp_connect(sk);
306 if (err)
307 goto late_failure;
308
309 return 0;
310
311 late_failure:
312 tcp_set_state(sk, TCP_CLOSE);
313 __sk_dst_reset(sk);
314 failure:
315 inet->inet_dport = 0;
316 sk->sk_route_caps = 0;
317 return err;
318 }
319
320 static void tcp_v6_mtu_reduced(struct sock *sk)
321 {
322 struct dst_entry *dst;
323
324 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
325 return;
326
327 dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info);
328 if (!dst)
329 return;
330
331 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
332 tcp_sync_mss(sk, dst_mtu(dst));
333 tcp_simple_retransmit(sk);
334 }
335 }
336
337 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
338 u8 type, u8 code, int offset, __be32 info)
339 {
340 const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
341 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
342 struct ipv6_pinfo *np;
343 struct sock *sk;
344 int err;
345 struct tcp_sock *tp;
346 __u32 seq;
347 struct net *net = dev_net(skb->dev);
348
349 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
350 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
351
352 if (sk == NULL) {
353 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
354 ICMP6_MIB_INERRORS);
355 return;
356 }
357
358 if (sk->sk_state == TCP_TIME_WAIT) {
359 inet_twsk_put(inet_twsk(sk));
360 return;
361 }
362
363 bh_lock_sock(sk);
364 if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG)
365 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
366
367 if (sk->sk_state == TCP_CLOSE)
368 goto out;
369
370 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
371 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
372 goto out;
373 }
374
375 tp = tcp_sk(sk);
376 seq = ntohl(th->seq);
377 if (sk->sk_state != TCP_LISTEN &&
378 !between(seq, tp->snd_una, tp->snd_nxt)) {
379 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
380 goto out;
381 }
382
383 np = inet6_sk(sk);
384
385 if (type == NDISC_REDIRECT) {
386 struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
387
388 if (dst)
389 dst->ops->redirect(dst, sk, skb);
390 goto out;
391 }
392
393 if (type == ICMPV6_PKT_TOOBIG) {
394 /* We are not interested in TCP_LISTEN and open_requests
395 * (SYN-ACKs send out by Linux are always <576bytes so
396 * they should go through unfragmented).
397 */
398 if (sk->sk_state == TCP_LISTEN)
399 goto out;
400
401 tp->mtu_info = ntohl(info);
402 if (!sock_owned_by_user(sk))
403 tcp_v6_mtu_reduced(sk);
404 else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED,
405 &tp->tsq_flags))
406 sock_hold(sk);
407 goto out;
408 }
409
410 icmpv6_err_convert(type, code, &err);
411
412 /* Might be for an request_sock */
413 switch (sk->sk_state) {
414 struct request_sock *req, **prev;
415 case TCP_LISTEN:
416 if (sock_owned_by_user(sk))
417 goto out;
418
419 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
420 &hdr->saddr, inet6_iif(skb));
421 if (!req)
422 goto out;
423
424 /* ICMPs are not backlogged, hence we cannot get
425 * an established socket here.
426 */
427 WARN_ON(req->sk != NULL);
428
429 if (seq != tcp_rsk(req)->snt_isn) {
430 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
431 goto out;
432 }
433
434 inet_csk_reqsk_queue_drop(sk, req, prev);
435 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
436 goto out;
437
438 case TCP_SYN_SENT:
439 case TCP_SYN_RECV: /* Cannot happen.
440 It can, it SYNs are crossed. --ANK */
441 if (!sock_owned_by_user(sk)) {
442 sk->sk_err = err;
443 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
444
445 tcp_done(sk);
446 } else
447 sk->sk_err_soft = err;
448 goto out;
449 }
450
451 if (!sock_owned_by_user(sk) && np->recverr) {
452 sk->sk_err = err;
453 sk->sk_error_report(sk);
454 } else
455 sk->sk_err_soft = err;
456
457 out:
458 bh_unlock_sock(sk);
459 sock_put(sk);
460 }
461
462
463 static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst,
464 struct flowi6 *fl6,
465 struct request_sock *req,
466 u16 queue_mapping)
467 {
468 struct inet_request_sock *ireq = inet_rsk(req);
469 struct ipv6_pinfo *np = inet6_sk(sk);
470 struct sk_buff * skb;
471 int err = -ENOMEM;
472
473 /* First, grab a route. */
474 if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL)
475 goto done;
476
477 skb = tcp_make_synack(sk, dst, req, NULL);
478
479 if (skb) {
480 __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr,
481 &ireq->ir_v6_rmt_addr);
482
483 fl6->daddr = ireq->ir_v6_rmt_addr;
484 skb_set_queue_mapping(skb, queue_mapping);
485 err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
486 err = net_xmit_eval(err);
487 }
488
489 done:
490 return err;
491 }
492
493 static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req)
494 {
495 struct flowi6 fl6;
496 int res;
497
498 res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0);
499 if (!res)
500 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
501 return res;
502 }
503
504 static void tcp_v6_reqsk_destructor(struct request_sock *req)
505 {
506 kfree_skb(inet_rsk(req)->pktopts);
507 }
508
509 #ifdef CONFIG_TCP_MD5SIG
510 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
511 const struct in6_addr *addr)
512 {
513 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
514 }
515
516 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
517 struct sock *addr_sk)
518 {
519 return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
520 }
521
522 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
523 struct request_sock *req)
524 {
525 return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr);
526 }
527
528 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
529 int optlen)
530 {
531 struct tcp_md5sig cmd;
532 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
533
534 if (optlen < sizeof(cmd))
535 return -EINVAL;
536
537 if (copy_from_user(&cmd, optval, sizeof(cmd)))
538 return -EFAULT;
539
540 if (sin6->sin6_family != AF_INET6)
541 return -EINVAL;
542
543 if (!cmd.tcpm_keylen) {
544 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
545 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
546 AF_INET);
547 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
548 AF_INET6);
549 }
550
551 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
552 return -EINVAL;
553
554 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
555 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
556 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
557
558 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
559 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
560 }
561
562 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
563 const struct in6_addr *daddr,
564 const struct in6_addr *saddr, int nbytes)
565 {
566 struct tcp6_pseudohdr *bp;
567 struct scatterlist sg;
568
569 bp = &hp->md5_blk.ip6;
570 /* 1. TCP pseudo-header (RFC2460) */
571 bp->saddr = *saddr;
572 bp->daddr = *daddr;
573 bp->protocol = cpu_to_be32(IPPROTO_TCP);
574 bp->len = cpu_to_be32(nbytes);
575
576 sg_init_one(&sg, bp, sizeof(*bp));
577 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
578 }
579
580 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
581 const struct in6_addr *daddr, struct in6_addr *saddr,
582 const struct tcphdr *th)
583 {
584 struct tcp_md5sig_pool *hp;
585 struct hash_desc *desc;
586
587 hp = tcp_get_md5sig_pool();
588 if (!hp)
589 goto clear_hash_noput;
590 desc = &hp->md5_desc;
591
592 if (crypto_hash_init(desc))
593 goto clear_hash;
594 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
595 goto clear_hash;
596 if (tcp_md5_hash_header(hp, th))
597 goto clear_hash;
598 if (tcp_md5_hash_key(hp, key))
599 goto clear_hash;
600 if (crypto_hash_final(desc, md5_hash))
601 goto clear_hash;
602
603 tcp_put_md5sig_pool();
604 return 0;
605
606 clear_hash:
607 tcp_put_md5sig_pool();
608 clear_hash_noput:
609 memset(md5_hash, 0, 16);
610 return 1;
611 }
612
613 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
614 const struct sock *sk,
615 const struct request_sock *req,
616 const struct sk_buff *skb)
617 {
618 const struct in6_addr *saddr, *daddr;
619 struct tcp_md5sig_pool *hp;
620 struct hash_desc *desc;
621 const struct tcphdr *th = tcp_hdr(skb);
622
623 if (sk) {
624 saddr = &inet6_sk(sk)->saddr;
625 daddr = &sk->sk_v6_daddr;
626 } else if (req) {
627 saddr = &inet_rsk(req)->ir_v6_loc_addr;
628 daddr = &inet_rsk(req)->ir_v6_rmt_addr;
629 } else {
630 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
631 saddr = &ip6h->saddr;
632 daddr = &ip6h->daddr;
633 }
634
635 hp = tcp_get_md5sig_pool();
636 if (!hp)
637 goto clear_hash_noput;
638 desc = &hp->md5_desc;
639
640 if (crypto_hash_init(desc))
641 goto clear_hash;
642
643 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
644 goto clear_hash;
645 if (tcp_md5_hash_header(hp, th))
646 goto clear_hash;
647 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
648 goto clear_hash;
649 if (tcp_md5_hash_key(hp, key))
650 goto clear_hash;
651 if (crypto_hash_final(desc, md5_hash))
652 goto clear_hash;
653
654 tcp_put_md5sig_pool();
655 return 0;
656
657 clear_hash:
658 tcp_put_md5sig_pool();
659 clear_hash_noput:
660 memset(md5_hash, 0, 16);
661 return 1;
662 }
663
664 static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
665 {
666 const __u8 *hash_location = NULL;
667 struct tcp_md5sig_key *hash_expected;
668 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
669 const struct tcphdr *th = tcp_hdr(skb);
670 int genhash;
671 u8 newhash[16];
672
673 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
674 hash_location = tcp_parse_md5sig_option(th);
675
676 /* We've parsed the options - do we have a hash? */
677 if (!hash_expected && !hash_location)
678 return 0;
679
680 if (hash_expected && !hash_location) {
681 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
682 return 1;
683 }
684
685 if (!hash_expected && hash_location) {
686 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
687 return 1;
688 }
689
690 /* check the signature */
691 genhash = tcp_v6_md5_hash_skb(newhash,
692 hash_expected,
693 NULL, NULL, skb);
694
695 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
696 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
697 genhash ? "failed" : "mismatch",
698 &ip6h->saddr, ntohs(th->source),
699 &ip6h->daddr, ntohs(th->dest));
700 return 1;
701 }
702 return 0;
703 }
704 #endif
705
706 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
707 .family = AF_INET6,
708 .obj_size = sizeof(struct tcp6_request_sock),
709 .rtx_syn_ack = tcp_v6_rtx_synack,
710 .send_ack = tcp_v6_reqsk_send_ack,
711 .destructor = tcp_v6_reqsk_destructor,
712 .send_reset = tcp_v6_send_reset,
713 .syn_ack_timeout = tcp_syn_ack_timeout,
714 };
715
716 #ifdef CONFIG_TCP_MD5SIG
717 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
718 .md5_lookup = tcp_v6_reqsk_md5_lookup,
719 .calc_md5_hash = tcp_v6_md5_hash_skb,
720 };
721 #endif
722
723 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
724 u32 tsval, u32 tsecr,
725 struct tcp_md5sig_key *key, int rst, u8 tclass)
726 {
727 const struct tcphdr *th = tcp_hdr(skb);
728 struct tcphdr *t1;
729 struct sk_buff *buff;
730 struct flowi6 fl6;
731 struct net *net = dev_net(skb_dst(skb)->dev);
732 struct sock *ctl_sk = net->ipv6.tcp_sk;
733 unsigned int tot_len = sizeof(struct tcphdr);
734 struct dst_entry *dst;
735 __be32 *topt;
736
737 if (tsecr)
738 tot_len += TCPOLEN_TSTAMP_ALIGNED;
739 #ifdef CONFIG_TCP_MD5SIG
740 if (key)
741 tot_len += TCPOLEN_MD5SIG_ALIGNED;
742 #endif
743
744 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
745 GFP_ATOMIC);
746 if (buff == NULL)
747 return;
748
749 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
750
751 t1 = (struct tcphdr *) skb_push(buff, tot_len);
752 skb_reset_transport_header(buff);
753
754 /* Swap the send and the receive. */
755 memset(t1, 0, sizeof(*t1));
756 t1->dest = th->source;
757 t1->source = th->dest;
758 t1->doff = tot_len / 4;
759 t1->seq = htonl(seq);
760 t1->ack_seq = htonl(ack);
761 t1->ack = !rst || !th->ack;
762 t1->rst = rst;
763 t1->window = htons(win);
764
765 topt = (__be32 *)(t1 + 1);
766
767 if (tsecr) {
768 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
769 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
770 *topt++ = htonl(tsval);
771 *topt++ = htonl(tsecr);
772 }
773
774 #ifdef CONFIG_TCP_MD5SIG
775 if (key) {
776 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
777 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
778 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
779 &ipv6_hdr(skb)->saddr,
780 &ipv6_hdr(skb)->daddr, t1);
781 }
782 #endif
783
784 memset(&fl6, 0, sizeof(fl6));
785 fl6.daddr = ipv6_hdr(skb)->saddr;
786 fl6.saddr = ipv6_hdr(skb)->daddr;
787
788 buff->ip_summed = CHECKSUM_PARTIAL;
789 buff->csum = 0;
790
791 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
792
793 fl6.flowi6_proto = IPPROTO_TCP;
794 if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
795 fl6.flowi6_oif = inet6_iif(skb);
796 fl6.fl6_dport = t1->dest;
797 fl6.fl6_sport = t1->source;
798 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
799
800 /* Pass a socket to ip6_dst_lookup either it is for RST
801 * Underlying function will use this to retrieve the network
802 * namespace
803 */
804 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
805 if (!IS_ERR(dst)) {
806 skb_dst_set(buff, dst);
807 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
808 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
809 if (rst)
810 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
811 return;
812 }
813
814 kfree_skb(buff);
815 }
816
817 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
818 {
819 const struct tcphdr *th = tcp_hdr(skb);
820 u32 seq = 0, ack_seq = 0;
821 struct tcp_md5sig_key *key = NULL;
822 #ifdef CONFIG_TCP_MD5SIG
823 const __u8 *hash_location = NULL;
824 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
825 unsigned char newhash[16];
826 int genhash;
827 struct sock *sk1 = NULL;
828 #endif
829
830 if (th->rst)
831 return;
832
833 if (!ipv6_unicast_destination(skb))
834 return;
835
836 #ifdef CONFIG_TCP_MD5SIG
837 hash_location = tcp_parse_md5sig_option(th);
838 if (!sk && hash_location) {
839 /*
840 * active side is lost. Try to find listening socket through
841 * source port, and then find md5 key through listening socket.
842 * we are not loose security here:
843 * Incoming packet is checked with md5 hash with finding key,
844 * no RST generated if md5 hash doesn't match.
845 */
846 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
847 &tcp_hashinfo, &ipv6h->saddr,
848 th->source, &ipv6h->daddr,
849 ntohs(th->source), inet6_iif(skb));
850 if (!sk1)
851 return;
852
853 rcu_read_lock();
854 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
855 if (!key)
856 goto release_sk1;
857
858 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb);
859 if (genhash || memcmp(hash_location, newhash, 16) != 0)
860 goto release_sk1;
861 } else {
862 key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
863 }
864 #endif
865
866 if (th->ack)
867 seq = ntohl(th->ack_seq);
868 else
869 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
870 (th->doff << 2);
871
872 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0);
873
874 #ifdef CONFIG_TCP_MD5SIG
875 release_sk1:
876 if (sk1) {
877 rcu_read_unlock();
878 sock_put(sk1);
879 }
880 #endif
881 }
882
883 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
884 u32 win, u32 tsval, u32 tsecr,
885 struct tcp_md5sig_key *key, u8 tclass)
886 {
887 tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass);
888 }
889
890 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
891 {
892 struct inet_timewait_sock *tw = inet_twsk(sk);
893 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
894
895 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
896 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
897 tcp_time_stamp + tcptw->tw_ts_offset,
898 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
899 tw->tw_tclass);
900
901 inet_twsk_put(tw);
902 }
903
904 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
905 struct request_sock *req)
906 {
907 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1,
908 req->rcv_wnd, tcp_time_stamp, req->ts_recent,
909 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
910 }
911
912
913 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
914 {
915 struct request_sock *req, **prev;
916 const struct tcphdr *th = tcp_hdr(skb);
917 struct sock *nsk;
918
919 /* Find possible connection requests. */
920 req = inet6_csk_search_req(sk, &prev, th->source,
921 &ipv6_hdr(skb)->saddr,
922 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
923 if (req)
924 return tcp_check_req(sk, skb, req, prev, false);
925
926 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
927 &ipv6_hdr(skb)->saddr, th->source,
928 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
929
930 if (nsk) {
931 if (nsk->sk_state != TCP_TIME_WAIT) {
932 bh_lock_sock(nsk);
933 return nsk;
934 }
935 inet_twsk_put(inet_twsk(nsk));
936 return NULL;
937 }
938
939 #ifdef CONFIG_SYN_COOKIES
940 if (!th->syn)
941 sk = cookie_v6_check(sk, skb);
942 #endif
943 return sk;
944 }
945
946 /* FIXME: this is substantially similar to the ipv4 code.
947 * Can some kind of merge be done? -- erics
948 */
949 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
950 {
951 struct tcp_options_received tmp_opt;
952 struct request_sock *req;
953 struct inet_request_sock *ireq;
954 struct ipv6_pinfo *np = inet6_sk(sk);
955 struct tcp_sock *tp = tcp_sk(sk);
956 __u32 isn = TCP_SKB_CB(skb)->when;
957 struct dst_entry *dst = NULL;
958 struct flowi6 fl6;
959 bool want_cookie = false;
960
961 if (skb->protocol == htons(ETH_P_IP))
962 return tcp_v4_conn_request(sk, skb);
963
964 if (!ipv6_unicast_destination(skb))
965 goto drop;
966
967 if ((sysctl_tcp_syncookies == 2 ||
968 inet_csk_reqsk_queue_is_full(sk)) && !isn) {
969 want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
970 if (!want_cookie)
971 goto drop;
972 }
973
974 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) {
975 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
976 goto drop;
977 }
978
979 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
980 if (req == NULL)
981 goto drop;
982
983 #ifdef CONFIG_TCP_MD5SIG
984 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
985 #endif
986
987 tcp_clear_options(&tmp_opt);
988 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
989 tmp_opt.user_mss = tp->rx_opt.user_mss;
990 tcp_parse_options(skb, &tmp_opt, 0, NULL);
991
992 if (want_cookie && !tmp_opt.saw_tstamp)
993 tcp_clear_options(&tmp_opt);
994
995 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
996 tcp_openreq_init(req, &tmp_opt, skb);
997
998 ireq = inet_rsk(req);
999 ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr;
1000 ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr;
1001 if (!want_cookie || tmp_opt.tstamp_ok)
1002 TCP_ECN_create_request(req, skb, sock_net(sk));
1003
1004 ireq->ir_iif = sk->sk_bound_dev_if;
1005
1006 /* So that link locals have meaning */
1007 if (!sk->sk_bound_dev_if &&
1008 ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL)
1009 ireq->ir_iif = inet6_iif(skb);
1010
1011 if (!isn) {
1012 if (ipv6_opt_accepted(sk, skb) ||
1013 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1014 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1015 atomic_inc(&skb->users);
1016 ireq->pktopts = skb;
1017 }
1018
1019 if (want_cookie) {
1020 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1021 req->cookie_ts = tmp_opt.tstamp_ok;
1022 goto have_isn;
1023 }
1024
1025 /* VJ's idea. We save last timestamp seen
1026 * from the destination in peer table, when entering
1027 * state TIME-WAIT, and check against it before
1028 * accepting new connection request.
1029 *
1030 * If "isn" is not zero, this request hit alive
1031 * timewait bucket, so that all the necessary checks
1032 * are made in the function processing timewait state.
1033 */
1034 if (tmp_opt.saw_tstamp &&
1035 tcp_death_row.sysctl_tw_recycle &&
1036 (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) {
1037 if (!tcp_peer_is_proven(req, dst, true)) {
1038 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
1039 goto drop_and_release;
1040 }
1041 }
1042 /* Kill the following clause, if you dislike this way. */
1043 else if (!sysctl_tcp_syncookies &&
1044 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
1045 (sysctl_max_syn_backlog >> 2)) &&
1046 !tcp_peer_is_proven(req, dst, false)) {
1047 /* Without syncookies last quarter of
1048 * backlog is filled with destinations,
1049 * proven to be alive.
1050 * It means that we continue to communicate
1051 * to destinations, already remembered
1052 * to the moment of synflood.
1053 */
1054 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
1055 &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source));
1056 goto drop_and_release;
1057 }
1058
1059 isn = tcp_v6_init_sequence(skb);
1060 }
1061 have_isn:
1062 tcp_rsk(req)->snt_isn = isn;
1063
1064 if (security_inet_conn_request(sk, skb, req))
1065 goto drop_and_release;
1066
1067 if (tcp_v6_send_synack(sk, dst, &fl6, req,
1068 skb_get_queue_mapping(skb)) ||
1069 want_cookie)
1070 goto drop_and_free;
1071
1072 tcp_rsk(req)->snt_synack = tcp_time_stamp;
1073 tcp_rsk(req)->listener = NULL;
1074 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1075 return 0;
1076
1077 drop_and_release:
1078 dst_release(dst);
1079 drop_and_free:
1080 reqsk_free(req);
1081 drop:
1082 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1083 return 0; /* don't send reset */
1084 }
1085
1086 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1087 struct request_sock *req,
1088 struct dst_entry *dst)
1089 {
1090 struct inet_request_sock *ireq;
1091 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1092 struct tcp6_sock *newtcp6sk;
1093 struct inet_sock *newinet;
1094 struct tcp_sock *newtp;
1095 struct sock *newsk;
1096 #ifdef CONFIG_TCP_MD5SIG
1097 struct tcp_md5sig_key *key;
1098 #endif
1099 struct flowi6 fl6;
1100
1101 if (skb->protocol == htons(ETH_P_IP)) {
1102 /*
1103 * v6 mapped
1104 */
1105
1106 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1107
1108 if (newsk == NULL)
1109 return NULL;
1110
1111 newtcp6sk = (struct tcp6_sock *)newsk;
1112 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1113
1114 newinet = inet_sk(newsk);
1115 newnp = inet6_sk(newsk);
1116 newtp = tcp_sk(newsk);
1117
1118 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1119
1120 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
1121
1122 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
1123
1124 newsk->sk_v6_rcv_saddr = newnp->saddr;
1125
1126 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1127 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1128 #ifdef CONFIG_TCP_MD5SIG
1129 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1130 #endif
1131
1132 newnp->ipv6_ac_list = NULL;
1133 newnp->ipv6_fl_list = NULL;
1134 newnp->pktoptions = NULL;
1135 newnp->opt = NULL;
1136 newnp->mcast_oif = inet6_iif(skb);
1137 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1138 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));
1139
1140 /*
1141 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1142 * here, tcp_create_openreq_child now does this for us, see the comment in
1143 * that function for the gory details. -acme
1144 */
1145
1146 /* It is tricky place. Until this moment IPv4 tcp
1147 worked with IPv6 icsk.icsk_af_ops.
1148 Sync it now.
1149 */
1150 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1151
1152 return newsk;
1153 }
1154
1155 ireq = inet_rsk(req);
1156
1157 if (sk_acceptq_is_full(sk))
1158 goto out_overflow;
1159
1160 if (!dst) {
1161 dst = inet6_csk_route_req(sk, &fl6, req);
1162 if (!dst)
1163 goto out;
1164 }
1165
1166 newsk = tcp_create_openreq_child(sk, req, skb);
1167 if (newsk == NULL)
1168 goto out_nonewsk;
1169
1170 /*
1171 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1172 * count here, tcp_create_openreq_child now does this for us, see the
1173 * comment in that function for the gory details. -acme
1174 */
1175
1176 newsk->sk_gso_type = SKB_GSO_TCPV6;
1177 __ip6_dst_store(newsk, dst, NULL, NULL);
1178 inet6_sk_rx_dst_set(newsk, skb);
1179
1180 newtcp6sk = (struct tcp6_sock *)newsk;
1181 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1182
1183 newtp = tcp_sk(newsk);
1184 newinet = inet_sk(newsk);
1185 newnp = inet6_sk(newsk);
1186
1187 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1188
1189 newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr;
1190 newnp->saddr = ireq->ir_v6_loc_addr;
1191 newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr;
1192 newsk->sk_bound_dev_if = ireq->ir_iif;
1193
1194 /* Now IPv6 options...
1195
1196 First: no IPv4 options.
1197 */
1198 newinet->inet_opt = NULL;
1199 newnp->ipv6_ac_list = NULL;
1200 newnp->ipv6_fl_list = NULL;
1201
1202 /* Clone RX bits */
1203 newnp->rxopt.all = np->rxopt.all;
1204
1205 /* Clone pktoptions received with SYN */
1206 newnp->pktoptions = NULL;
1207 if (ireq->pktopts != NULL) {
1208 newnp->pktoptions = skb_clone(ireq->pktopts,
1209 sk_gfp_atomic(sk, GFP_ATOMIC));
1210 consume_skb(ireq->pktopts);
1211 ireq->pktopts = NULL;
1212 if (newnp->pktoptions)
1213 skb_set_owner_r(newnp->pktoptions, newsk);
1214 }
1215 newnp->opt = NULL;
1216 newnp->mcast_oif = inet6_iif(skb);
1217 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1218 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));
1219
1220 /* Clone native IPv6 options from listening socket (if any)
1221
1222 Yes, keeping reference count would be much more clever,
1223 but we make one more one thing there: reattach optmem
1224 to newsk.
1225 */
1226 if (np->opt)
1227 newnp->opt = ipv6_dup_options(newsk, np->opt);
1228
1229 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1230 if (newnp->opt)
1231 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1232 newnp->opt->opt_flen);
1233
1234 tcp_mtup_init(newsk);
1235 tcp_sync_mss(newsk, dst_mtu(dst));
1236 newtp->advmss = dst_metric_advmss(dst);
1237 if (tcp_sk(sk)->rx_opt.user_mss &&
1238 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1239 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1240
1241 tcp_initialize_rcv_mss(newsk);
1242
1243 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1244 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1245
1246 #ifdef CONFIG_TCP_MD5SIG
1247 /* Copy over the MD5 key from the original socket */
1248 if ((key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr)) != NULL) {
1249 /* We're using one, so create a matching key
1250 * on the newsk structure. If we fail to get
1251 * memory, then we end up not copying the key
1252 * across. Shucks.
1253 */
1254 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
1255 AF_INET6, key->key, key->keylen,
1256 sk_gfp_atomic(sk, GFP_ATOMIC));
1257 }
1258 #endif
1259
1260 if (__inet_inherit_port(sk, newsk) < 0) {
1261 inet_csk_prepare_forced_close(newsk);
1262 tcp_done(newsk);
1263 goto out;
1264 }
1265 __inet6_hash(newsk, NULL);
1266
1267 return newsk;
1268
1269 out_overflow:
1270 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1271 out_nonewsk:
1272 dst_release(dst);
1273 out:
1274 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1275 return NULL;
1276 }
1277
1278 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1279 {
1280 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1281 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1282 &ipv6_hdr(skb)->daddr, skb->csum)) {
1283 skb->ip_summed = CHECKSUM_UNNECESSARY;
1284 return 0;
1285 }
1286 }
1287
1288 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1289 &ipv6_hdr(skb)->saddr,
1290 &ipv6_hdr(skb)->daddr, 0));
1291
1292 if (skb->len <= 76) {
1293 return __skb_checksum_complete(skb);
1294 }
1295 return 0;
1296 }
1297
1298 /* The socket must have it's spinlock held when we get
1299 * here.
1300 *
1301 * We have a potential double-lock case here, so even when
1302 * doing backlog processing we use the BH locking scheme.
1303 * This is because we cannot sleep with the original spinlock
1304 * held.
1305 */
1306 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1307 {
1308 struct ipv6_pinfo *np = inet6_sk(sk);
1309 struct tcp_sock *tp;
1310 struct sk_buff *opt_skb = NULL;
1311
1312 /* Imagine: socket is IPv6. IPv4 packet arrives,
1313 goes to IPv4 receive handler and backlogged.
1314 From backlog it always goes here. Kerboom...
1315 Fortunately, tcp_rcv_established and rcv_established
1316 handle them correctly, but it is not case with
1317 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1318 */
1319
1320 if (skb->protocol == htons(ETH_P_IP))
1321 return tcp_v4_do_rcv(sk, skb);
1322
1323 #ifdef CONFIG_TCP_MD5SIG
1324 if (tcp_v6_inbound_md5_hash (sk, skb))
1325 goto discard;
1326 #endif
1327
1328 if (sk_filter(sk, skb))
1329 goto discard;
1330
1331 /*
1332 * socket locking is here for SMP purposes as backlog rcv
1333 * is currently called with bh processing disabled.
1334 */
1335
1336 /* Do Stevens' IPV6_PKTOPTIONS.
1337
1338 Yes, guys, it is the only place in our code, where we
1339 may make it not affecting IPv4.
1340 The rest of code is protocol independent,
1341 and I do not like idea to uglify IPv4.
1342
1343 Actually, all the idea behind IPV6_PKTOPTIONS
1344 looks not very well thought. For now we latch
1345 options, received in the last packet, enqueued
1346 by tcp. Feel free to propose better solution.
1347 --ANK (980728)
1348 */
1349 if (np->rxopt.all)
1350 opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
1351
1352 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1353 struct dst_entry *dst = sk->sk_rx_dst;
1354
1355 sock_rps_save_rxhash(sk, skb);
1356 if (dst) {
1357 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1358 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1359 dst_release(dst);
1360 sk->sk_rx_dst = NULL;
1361 }
1362 }
1363
1364 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1365 if (opt_skb)
1366 goto ipv6_pktoptions;
1367 return 0;
1368 }
1369
1370 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1371 goto csum_err;
1372
1373 if (sk->sk_state == TCP_LISTEN) {
1374 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1375 if (!nsk)
1376 goto discard;
1377
1378 /*
1379 * Queue it on the new socket if the new socket is active,
1380 * otherwise we just shortcircuit this and continue with
1381 * the new socket..
1382 */
1383 if(nsk != sk) {
1384 sock_rps_save_rxhash(nsk, skb);
1385 if (tcp_child_process(sk, nsk, skb))
1386 goto reset;
1387 if (opt_skb)
1388 __kfree_skb(opt_skb);
1389 return 0;
1390 }
1391 } else
1392 sock_rps_save_rxhash(sk, skb);
1393
1394 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1395 goto reset;
1396 if (opt_skb)
1397 goto ipv6_pktoptions;
1398 return 0;
1399
1400 reset:
1401 tcp_v6_send_reset(sk, skb);
1402 discard:
1403 if (opt_skb)
1404 __kfree_skb(opt_skb);
1405 kfree_skb(skb);
1406 return 0;
1407 csum_err:
1408 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
1409 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1410 goto discard;
1411
1412
1413 ipv6_pktoptions:
1414 /* Do you ask, what is it?
1415
1416 1. skb was enqueued by tcp.
1417 2. skb is added to tail of read queue, rather than out of order.
1418 3. socket is not in passive state.
1419 4. Finally, it really contains options, which user wants to receive.
1420 */
1421 tp = tcp_sk(sk);
1422 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1423 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1424 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1425 np->mcast_oif = inet6_iif(opt_skb);
1426 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1427 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1428 if (np->rxopt.bits.rxtclass)
1429 np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb));
1430 if (ipv6_opt_accepted(sk, opt_skb)) {
1431 skb_set_owner_r(opt_skb, sk);
1432 opt_skb = xchg(&np->pktoptions, opt_skb);
1433 } else {
1434 __kfree_skb(opt_skb);
1435 opt_skb = xchg(&np->pktoptions, NULL);
1436 }
1437 }
1438
1439 kfree_skb(opt_skb);
1440 return 0;
1441 }
1442
1443 static int tcp_v6_rcv(struct sk_buff *skb)
1444 {
1445 const struct tcphdr *th;
1446 const struct ipv6hdr *hdr;
1447 struct sock *sk;
1448 int ret;
1449 struct net *net = dev_net(skb->dev);
1450
1451 if (skb->pkt_type != PACKET_HOST)
1452 goto discard_it;
1453
1454 /*
1455 * Count it even if it's bad.
1456 */
1457 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1458
1459 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1460 goto discard_it;
1461
1462 th = tcp_hdr(skb);
1463
1464 if (th->doff < sizeof(struct tcphdr)/4)
1465 goto bad_packet;
1466 if (!pskb_may_pull(skb, th->doff*4))
1467 goto discard_it;
1468
1469 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1470 goto csum_error;
1471
1472 th = tcp_hdr(skb);
1473 hdr = ipv6_hdr(skb);
1474 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1475 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1476 skb->len - th->doff*4);
1477 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1478 TCP_SKB_CB(skb)->when = 0;
1479 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1480 TCP_SKB_CB(skb)->sacked = 0;
1481
1482 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1483 if (!sk)
1484 goto no_tcp_socket;
1485
1486 process:
1487 if (sk->sk_state == TCP_TIME_WAIT)
1488 goto do_time_wait;
1489
1490 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1491 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1492 goto discard_and_relse;
1493 }
1494
1495 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1496 goto discard_and_relse;
1497
1498 if (sk_filter(sk, skb))
1499 goto discard_and_relse;
1500
1501 sk_mark_napi_id(sk, skb);
1502 skb->dev = NULL;
1503
1504 bh_lock_sock_nested(sk);
1505 ret = 0;
1506 if (!sock_owned_by_user(sk)) {
1507 #ifdef CONFIG_NET_DMA
1508 struct tcp_sock *tp = tcp_sk(sk);
1509 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1510 tp->ucopy.dma_chan = net_dma_find_channel();
1511 if (tp->ucopy.dma_chan)
1512 ret = tcp_v6_do_rcv(sk, skb);
1513 else
1514 #endif
1515 {
1516 if (!tcp_prequeue(sk, skb))
1517 ret = tcp_v6_do_rcv(sk, skb);
1518 }
1519 } else if (unlikely(sk_add_backlog(sk, skb,
1520 sk->sk_rcvbuf + sk->sk_sndbuf))) {
1521 bh_unlock_sock(sk);
1522 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1523 goto discard_and_relse;
1524 }
1525 bh_unlock_sock(sk);
1526
1527 sock_put(sk);
1528 return ret ? -1 : 0;
1529
1530 no_tcp_socket:
1531 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1532 goto discard_it;
1533
1534 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1535 csum_error:
1536 TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
1537 bad_packet:
1538 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1539 } else {
1540 tcp_v6_send_reset(NULL, skb);
1541 }
1542
1543 discard_it:
1544 kfree_skb(skb);
1545 return 0;
1546
1547 discard_and_relse:
1548 sock_put(sk);
1549 goto discard_it;
1550
1551 do_time_wait:
1552 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1553 inet_twsk_put(inet_twsk(sk));
1554 goto discard_it;
1555 }
1556
1557 if (skb->len < (th->doff<<2)) {
1558 inet_twsk_put(inet_twsk(sk));
1559 goto bad_packet;
1560 }
1561 if (tcp_checksum_complete(skb)) {
1562 inet_twsk_put(inet_twsk(sk));
1563 goto csum_error;
1564 }
1565
1566 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1567 case TCP_TW_SYN:
1568 {
1569 struct sock *sk2;
1570
1571 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1572 &ipv6_hdr(skb)->saddr, th->source,
1573 &ipv6_hdr(skb)->daddr,
1574 ntohs(th->dest), inet6_iif(skb));
1575 if (sk2 != NULL) {
1576 struct inet_timewait_sock *tw = inet_twsk(sk);
1577 inet_twsk_deschedule(tw, &tcp_death_row);
1578 inet_twsk_put(tw);
1579 sk = sk2;
1580 goto process;
1581 }
1582 /* Fall through to ACK */
1583 }
1584 case TCP_TW_ACK:
1585 tcp_v6_timewait_ack(sk, skb);
1586 break;
1587 case TCP_TW_RST:
1588 goto no_tcp_socket;
1589 case TCP_TW_SUCCESS:;
1590 }
1591 goto discard_it;
1592 }
1593
1594 static void tcp_v6_early_demux(struct sk_buff *skb)
1595 {
1596 const struct ipv6hdr *hdr;
1597 const struct tcphdr *th;
1598 struct sock *sk;
1599
1600 if (skb->pkt_type != PACKET_HOST)
1601 return;
1602
1603 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1604 return;
1605
1606 hdr = ipv6_hdr(skb);
1607 th = tcp_hdr(skb);
1608
1609 if (th->doff < sizeof(struct tcphdr) / 4)
1610 return;
1611
1612 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1613 &hdr->saddr, th->source,
1614 &hdr->daddr, ntohs(th->dest),
1615 inet6_iif(skb));
1616 if (sk) {
1617 skb->sk = sk;
1618 skb->destructor = sock_edemux;
1619 if (sk->sk_state != TCP_TIME_WAIT) {
1620 struct dst_entry *dst = sk->sk_rx_dst;
1621
1622 if (dst)
1623 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1624 if (dst &&
1625 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1626 skb_dst_set_noref(skb, dst);
1627 }
1628 }
1629 }
1630
1631 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1632 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1633 .twsk_unique = tcp_twsk_unique,
1634 .twsk_destructor= tcp_twsk_destructor,
1635 };
1636
1637 static const struct inet_connection_sock_af_ops ipv6_specific = {
1638 .queue_xmit = inet6_csk_xmit,
1639 .send_check = tcp_v6_send_check,
1640 .rebuild_header = inet6_sk_rebuild_header,
1641 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1642 .conn_request = tcp_v6_conn_request,
1643 .syn_recv_sock = tcp_v6_syn_recv_sock,
1644 .net_header_len = sizeof(struct ipv6hdr),
1645 .net_frag_header_len = sizeof(struct frag_hdr),
1646 .setsockopt = ipv6_setsockopt,
1647 .getsockopt = ipv6_getsockopt,
1648 .addr2sockaddr = inet6_csk_addr2sockaddr,
1649 .sockaddr_len = sizeof(struct sockaddr_in6),
1650 .bind_conflict = inet6_csk_bind_conflict,
1651 #ifdef CONFIG_COMPAT
1652 .compat_setsockopt = compat_ipv6_setsockopt,
1653 .compat_getsockopt = compat_ipv6_getsockopt,
1654 #endif
1655 };
1656
1657 #ifdef CONFIG_TCP_MD5SIG
1658 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1659 .md5_lookup = tcp_v6_md5_lookup,
1660 .calc_md5_hash = tcp_v6_md5_hash_skb,
1661 .md5_parse = tcp_v6_parse_md5_keys,
1662 };
1663 #endif
1664
1665 /*
1666 * TCP over IPv4 via INET6 API
1667 */
1668
1669 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1670 .queue_xmit = ip_queue_xmit,
1671 .send_check = tcp_v4_send_check,
1672 .rebuild_header = inet_sk_rebuild_header,
1673 .sk_rx_dst_set = inet_sk_rx_dst_set,
1674 .conn_request = tcp_v6_conn_request,
1675 .syn_recv_sock = tcp_v6_syn_recv_sock,
1676 .net_header_len = sizeof(struct iphdr),
1677 .setsockopt = ipv6_setsockopt,
1678 .getsockopt = ipv6_getsockopt,
1679 .addr2sockaddr = inet6_csk_addr2sockaddr,
1680 .sockaddr_len = sizeof(struct sockaddr_in6),
1681 .bind_conflict = inet6_csk_bind_conflict,
1682 #ifdef CONFIG_COMPAT
1683 .compat_setsockopt = compat_ipv6_setsockopt,
1684 .compat_getsockopt = compat_ipv6_getsockopt,
1685 #endif
1686 };
1687
1688 #ifdef CONFIG_TCP_MD5SIG
1689 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1690 .md5_lookup = tcp_v4_md5_lookup,
1691 .calc_md5_hash = tcp_v4_md5_hash_skb,
1692 .md5_parse = tcp_v6_parse_md5_keys,
1693 };
1694 #endif
1695
1696 /* NOTE: A lot of things set to zero explicitly by call to
1697 * sk_alloc() so need not be done here.
1698 */
1699 static int tcp_v6_init_sock(struct sock *sk)
1700 {
1701 struct inet_connection_sock *icsk = inet_csk(sk);
1702
1703 tcp_init_sock(sk);
1704
1705 icsk->icsk_af_ops = &ipv6_specific;
1706
1707 #ifdef CONFIG_TCP_MD5SIG
1708 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1709 #endif
1710
1711 return 0;
1712 }
1713
1714 static void tcp_v6_destroy_sock(struct sock *sk)
1715 {
1716 tcp_v4_destroy_sock(sk);
1717 inet6_destroy_sock(sk);
1718 }
1719
1720 #ifdef CONFIG_PROC_FS
1721 /* Proc filesystem TCPv6 sock list dumping. */
1722 static void get_openreq6(struct seq_file *seq,
1723 const struct sock *sk, struct request_sock *req, int i, kuid_t uid)
1724 {
1725 int ttd = req->expires - jiffies;
1726 const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr;
1727 const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr;
1728
1729 if (ttd < 0)
1730 ttd = 0;
1731
1732 seq_printf(seq,
1733 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1734 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1735 i,
1736 src->s6_addr32[0], src->s6_addr32[1],
1737 src->s6_addr32[2], src->s6_addr32[3],
1738 ntohs(inet_rsk(req)->ir_loc_port),
1739 dest->s6_addr32[0], dest->s6_addr32[1],
1740 dest->s6_addr32[2], dest->s6_addr32[3],
1741 ntohs(inet_rsk(req)->ir_rmt_port),
1742 TCP_SYN_RECV,
1743 0,0, /* could print option size, but that is af dependent. */
1744 1, /* timers active (only the expire timer) */
1745 jiffies_to_clock_t(ttd),
1746 req->num_timeout,
1747 from_kuid_munged(seq_user_ns(seq), uid),
1748 0, /* non standard timer */
1749 0, /* open_requests have no inode */
1750 0, req);
1751 }
1752
1753 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1754 {
1755 const struct in6_addr *dest, *src;
1756 __u16 destp, srcp;
1757 int timer_active;
1758 unsigned long timer_expires;
1759 const struct inet_sock *inet = inet_sk(sp);
1760 const struct tcp_sock *tp = tcp_sk(sp);
1761 const struct inet_connection_sock *icsk = inet_csk(sp);
1762
1763 dest = &sp->sk_v6_daddr;
1764 src = &sp->sk_v6_rcv_saddr;
1765 destp = ntohs(inet->inet_dport);
1766 srcp = ntohs(inet->inet_sport);
1767
1768 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1769 timer_active = 1;
1770 timer_expires = icsk->icsk_timeout;
1771 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1772 timer_active = 4;
1773 timer_expires = icsk->icsk_timeout;
1774 } else if (timer_pending(&sp->sk_timer)) {
1775 timer_active = 2;
1776 timer_expires = sp->sk_timer.expires;
1777 } else {
1778 timer_active = 0;
1779 timer_expires = jiffies;
1780 }
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 sp->sk_state,
1791 tp->write_seq-tp->snd_una,
1792 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
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 tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
1805 );
1806 }
1807
1808 static void get_timewait6_sock(struct seq_file *seq,
1809 struct inet_timewait_sock *tw, int i)
1810 {
1811 const struct in6_addr *dest, *src;
1812 __u16 destp, srcp;
1813 s32 delta = tw->tw_ttd - inet_tw_time_stamp();
1814
1815 dest = &tw->tw_v6_daddr;
1816 src = &tw->tw_v6_rcv_saddr;
1817 destp = ntohs(tw->tw_dport);
1818 srcp = ntohs(tw->tw_sport);
1819
1820 seq_printf(seq,
1821 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1822 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1823 i,
1824 src->s6_addr32[0], src->s6_addr32[1],
1825 src->s6_addr32[2], src->s6_addr32[3], srcp,
1826 dest->s6_addr32[0], dest->s6_addr32[1],
1827 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1828 tw->tw_substate, 0, 0,
1829 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1830 atomic_read(&tw->tw_refcnt), tw);
1831 }
1832
1833 static int tcp6_seq_show(struct seq_file *seq, void *v)
1834 {
1835 struct tcp_iter_state *st;
1836 struct sock *sk = v;
1837
1838 if (v == SEQ_START_TOKEN) {
1839 seq_puts(seq,
1840 " sl "
1841 "local_address "
1842 "remote_address "
1843 "st tx_queue rx_queue tr tm->when retrnsmt"
1844 " uid timeout inode\n");
1845 goto out;
1846 }
1847 st = seq->private;
1848
1849 switch (st->state) {
1850 case TCP_SEQ_STATE_LISTENING:
1851 case TCP_SEQ_STATE_ESTABLISHED:
1852 if (sk->sk_state == TCP_TIME_WAIT)
1853 get_timewait6_sock(seq, v, st->num);
1854 else
1855 get_tcp6_sock(seq, v, st->num);
1856 break;
1857 case TCP_SEQ_STATE_OPENREQ:
1858 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
1859 break;
1860 }
1861 out:
1862 return 0;
1863 }
1864
1865 static const struct file_operations tcp6_afinfo_seq_fops = {
1866 .owner = THIS_MODULE,
1867 .open = tcp_seq_open,
1868 .read = seq_read,
1869 .llseek = seq_lseek,
1870 .release = seq_release_net
1871 };
1872
1873 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1874 .name = "tcp6",
1875 .family = AF_INET6,
1876 .seq_fops = &tcp6_afinfo_seq_fops,
1877 .seq_ops = {
1878 .show = tcp6_seq_show,
1879 },
1880 };
1881
1882 int __net_init tcp6_proc_init(struct net *net)
1883 {
1884 return tcp_proc_register(net, &tcp6_seq_afinfo);
1885 }
1886
1887 void tcp6_proc_exit(struct net *net)
1888 {
1889 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1890 }
1891 #endif
1892
1893 static void tcp_v6_clear_sk(struct sock *sk, int size)
1894 {
1895 struct inet_sock *inet = inet_sk(sk);
1896
1897 /* we do not want to clear pinet6 field, because of RCU lookups */
1898 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6));
1899
1900 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1901 memset(&inet->pinet6 + 1, 0, size);
1902 }
1903
1904 struct proto tcpv6_prot = {
1905 .name = "TCPv6",
1906 .owner = THIS_MODULE,
1907 .close = tcp_close,
1908 .connect = tcp_v6_connect,
1909 .disconnect = tcp_disconnect,
1910 .accept = inet_csk_accept,
1911 .ioctl = tcp_ioctl,
1912 .init = tcp_v6_init_sock,
1913 .destroy = tcp_v6_destroy_sock,
1914 .shutdown = tcp_shutdown,
1915 .setsockopt = tcp_setsockopt,
1916 .getsockopt = tcp_getsockopt,
1917 .recvmsg = tcp_recvmsg,
1918 .sendmsg = tcp_sendmsg,
1919 .sendpage = tcp_sendpage,
1920 .backlog_rcv = tcp_v6_do_rcv,
1921 .release_cb = tcp_release_cb,
1922 .mtu_reduced = tcp_v6_mtu_reduced,
1923 .hash = tcp_v6_hash,
1924 .unhash = inet_unhash,
1925 .get_port = inet_csk_get_port,
1926 .enter_memory_pressure = tcp_enter_memory_pressure,
1927 .stream_memory_free = tcp_stream_memory_free,
1928 .sockets_allocated = &tcp_sockets_allocated,
1929 .memory_allocated = &tcp_memory_allocated,
1930 .memory_pressure = &tcp_memory_pressure,
1931 .orphan_count = &tcp_orphan_count,
1932 .sysctl_wmem = sysctl_tcp_wmem,
1933 .sysctl_rmem = sysctl_tcp_rmem,
1934 .max_header = MAX_TCP_HEADER,
1935 .obj_size = sizeof(struct tcp6_sock),
1936 .slab_flags = SLAB_DESTROY_BY_RCU,
1937 .twsk_prot = &tcp6_timewait_sock_ops,
1938 .rsk_prot = &tcp6_request_sock_ops,
1939 .h.hashinfo = &tcp_hashinfo,
1940 .no_autobind = true,
1941 #ifdef CONFIG_COMPAT
1942 .compat_setsockopt = compat_tcp_setsockopt,
1943 .compat_getsockopt = compat_tcp_getsockopt,
1944 #endif
1945 #ifdef CONFIG_MEMCG_KMEM
1946 .proto_cgroup = tcp_proto_cgroup,
1947 #endif
1948 .clear_sk = tcp_v6_clear_sk,
1949 };
1950
1951 static const struct inet6_protocol tcpv6_protocol = {
1952 .early_demux = tcp_v6_early_demux,
1953 .handler = tcp_v6_rcv,
1954 .err_handler = tcp_v6_err,
1955 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1956 };
1957
1958 static struct inet_protosw tcpv6_protosw = {
1959 .type = SOCK_STREAM,
1960 .protocol = IPPROTO_TCP,
1961 .prot = &tcpv6_prot,
1962 .ops = &inet6_stream_ops,
1963 .no_check = 0,
1964 .flags = INET_PROTOSW_PERMANENT |
1965 INET_PROTOSW_ICSK,
1966 };
1967
1968 static int __net_init tcpv6_net_init(struct net *net)
1969 {
1970 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1971 SOCK_RAW, IPPROTO_TCP, net);
1972 }
1973
1974 static void __net_exit tcpv6_net_exit(struct net *net)
1975 {
1976 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1977 }
1978
1979 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1980 {
1981 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1982 }
1983
1984 static struct pernet_operations tcpv6_net_ops = {
1985 .init = tcpv6_net_init,
1986 .exit = tcpv6_net_exit,
1987 .exit_batch = tcpv6_net_exit_batch,
1988 };
1989
1990 int __init tcpv6_init(void)
1991 {
1992 int ret;
1993
1994 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1995 if (ret)
1996 goto out;
1997
1998 /* register inet6 protocol */
1999 ret = inet6_register_protosw(&tcpv6_protosw);
2000 if (ret)
2001 goto out_tcpv6_protocol;
2002
2003 ret = register_pernet_subsys(&tcpv6_net_ops);
2004 if (ret)
2005 goto out_tcpv6_protosw;
2006 out:
2007 return ret;
2008
2009 out_tcpv6_protosw:
2010 inet6_unregister_protosw(&tcpv6_protosw);
2011 out_tcpv6_protocol:
2012 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2013 goto out;
2014 }
2015
2016 void tcpv6_exit(void)
2017 {
2018 unregister_pernet_subsys(&tcpv6_net_ops);
2019 inet6_unregister_protosw(&tcpv6_protosw);
2020 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2021 }
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