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[thirdparty/linux.git] / net / ipv6 / tcp_ipv6.c
1 /*
2 * TCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on:
9 * linux/net/ipv4/tcp.c
10 * linux/net/ipv4/tcp_input.c
11 * linux/net/ipv4/tcp_output.c
12 *
13 * Fixes:
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
16 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
17 * a single port at the same time.
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/bottom_half.h>
27 #include <linux/module.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/socket.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/jiffies.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/init.h>
38 #include <linux/jhash.h>
39 #include <linux/ipsec.h>
40 #include <linux/times.h>
41 #include <linux/slab.h>
42
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(&np->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 np->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 &np->rcv_saddr);
241 }
242
243 return err;
244 }
245
246 if (!ipv6_addr_any(&np->rcv_saddr))
247 saddr = &np->rcv_saddr;
248
249 fl6.flowi6_proto = IPPROTO_TCP;
250 fl6.daddr = np->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 np->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, &np->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 np->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 inet6_request_sock *treq = inet6_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, &treq->loc_addr, &treq->rmt_addr);
481
482 fl6->daddr = treq->rmt_addr;
483 skb_set_queue_mapping(skb, queue_mapping);
484 err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
485 err = net_xmit_eval(err);
486 }
487
488 done:
489 return err;
490 }
491
492 static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req)
493 {
494 struct flowi6 fl6;
495 int res;
496
497 res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0);
498 if (!res)
499 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
500 return res;
501 }
502
503 static void tcp_v6_reqsk_destructor(struct request_sock *req)
504 {
505 kfree_skb(inet6_rsk(req)->pktopts);
506 }
507
508 #ifdef CONFIG_TCP_MD5SIG
509 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
510 const struct in6_addr *addr)
511 {
512 return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
513 }
514
515 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
516 struct sock *addr_sk)
517 {
518 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
519 }
520
521 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
522 struct request_sock *req)
523 {
524 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
525 }
526
527 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
528 int optlen)
529 {
530 struct tcp_md5sig cmd;
531 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
532
533 if (optlen < sizeof(cmd))
534 return -EINVAL;
535
536 if (copy_from_user(&cmd, optval, sizeof(cmd)))
537 return -EFAULT;
538
539 if (sin6->sin6_family != AF_INET6)
540 return -EINVAL;
541
542 if (!cmd.tcpm_keylen) {
543 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
544 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
545 AF_INET);
546 return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
547 AF_INET6);
548 }
549
550 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
551 return -EINVAL;
552
553 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
554 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
555 AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
556
557 return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
558 AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
559 }
560
561 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
562 const struct in6_addr *daddr,
563 const struct in6_addr *saddr, int nbytes)
564 {
565 struct tcp6_pseudohdr *bp;
566 struct scatterlist sg;
567
568 bp = &hp->md5_blk.ip6;
569 /* 1. TCP pseudo-header (RFC2460) */
570 bp->saddr = *saddr;
571 bp->daddr = *daddr;
572 bp->protocol = cpu_to_be32(IPPROTO_TCP);
573 bp->len = cpu_to_be32(nbytes);
574
575 sg_init_one(&sg, bp, sizeof(*bp));
576 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
577 }
578
579 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
580 const struct in6_addr *daddr, struct in6_addr *saddr,
581 const struct tcphdr *th)
582 {
583 struct tcp_md5sig_pool *hp;
584 struct hash_desc *desc;
585
586 hp = tcp_get_md5sig_pool();
587 if (!hp)
588 goto clear_hash_noput;
589 desc = &hp->md5_desc;
590
591 if (crypto_hash_init(desc))
592 goto clear_hash;
593 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
594 goto clear_hash;
595 if (tcp_md5_hash_header(hp, th))
596 goto clear_hash;
597 if (tcp_md5_hash_key(hp, key))
598 goto clear_hash;
599 if (crypto_hash_final(desc, md5_hash))
600 goto clear_hash;
601
602 tcp_put_md5sig_pool();
603 return 0;
604
605 clear_hash:
606 tcp_put_md5sig_pool();
607 clear_hash_noput:
608 memset(md5_hash, 0, 16);
609 return 1;
610 }
611
612 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
613 const struct sock *sk,
614 const struct request_sock *req,
615 const struct sk_buff *skb)
616 {
617 const struct in6_addr *saddr, *daddr;
618 struct tcp_md5sig_pool *hp;
619 struct hash_desc *desc;
620 const struct tcphdr *th = tcp_hdr(skb);
621
622 if (sk) {
623 saddr = &inet6_sk(sk)->saddr;
624 daddr = &inet6_sk(sk)->daddr;
625 } else if (req) {
626 saddr = &inet6_rsk(req)->loc_addr;
627 daddr = &inet6_rsk(req)->rmt_addr;
628 } else {
629 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
630 saddr = &ip6h->saddr;
631 daddr = &ip6h->daddr;
632 }
633
634 hp = tcp_get_md5sig_pool();
635 if (!hp)
636 goto clear_hash_noput;
637 desc = &hp->md5_desc;
638
639 if (crypto_hash_init(desc))
640 goto clear_hash;
641
642 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
643 goto clear_hash;
644 if (tcp_md5_hash_header(hp, th))
645 goto clear_hash;
646 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
647 goto clear_hash;
648 if (tcp_md5_hash_key(hp, key))
649 goto clear_hash;
650 if (crypto_hash_final(desc, md5_hash))
651 goto clear_hash;
652
653 tcp_put_md5sig_pool();
654 return 0;
655
656 clear_hash:
657 tcp_put_md5sig_pool();
658 clear_hash_noput:
659 memset(md5_hash, 0, 16);
660 return 1;
661 }
662
663 static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
664 {
665 const __u8 *hash_location = NULL;
666 struct tcp_md5sig_key *hash_expected;
667 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
668 const struct tcphdr *th = tcp_hdr(skb);
669 int genhash;
670 u8 newhash[16];
671
672 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
673 hash_location = tcp_parse_md5sig_option(th);
674
675 /* We've parsed the options - do we have a hash? */
676 if (!hash_expected && !hash_location)
677 return 0;
678
679 if (hash_expected && !hash_location) {
680 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
681 return 1;
682 }
683
684 if (!hash_expected && hash_location) {
685 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
686 return 1;
687 }
688
689 /* check the signature */
690 genhash = tcp_v6_md5_hash_skb(newhash,
691 hash_expected,
692 NULL, NULL, skb);
693
694 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
695 net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
696 genhash ? "failed" : "mismatch",
697 &ip6h->saddr, ntohs(th->source),
698 &ip6h->daddr, ntohs(th->dest));
699 return 1;
700 }
701 return 0;
702 }
703 #endif
704
705 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
706 .family = AF_INET6,
707 .obj_size = sizeof(struct tcp6_request_sock),
708 .rtx_syn_ack = tcp_v6_rtx_synack,
709 .send_ack = tcp_v6_reqsk_send_ack,
710 .destructor = tcp_v6_reqsk_destructor,
711 .send_reset = tcp_v6_send_reset,
712 .syn_ack_timeout = tcp_syn_ack_timeout,
713 };
714
715 #ifdef CONFIG_TCP_MD5SIG
716 static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
717 .md5_lookup = tcp_v6_reqsk_md5_lookup,
718 .calc_md5_hash = tcp_v6_md5_hash_skb,
719 };
720 #endif
721
722 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
723 u32 tsval, u32 tsecr,
724 struct tcp_md5sig_key *key, int rst, u8 tclass)
725 {
726 const struct tcphdr *th = tcp_hdr(skb);
727 struct tcphdr *t1;
728 struct sk_buff *buff;
729 struct flowi6 fl6;
730 struct net *net = dev_net(skb_dst(skb)->dev);
731 struct sock *ctl_sk = net->ipv6.tcp_sk;
732 unsigned int tot_len = sizeof(struct tcphdr);
733 struct dst_entry *dst;
734 __be32 *topt;
735
736 if (tsecr)
737 tot_len += TCPOLEN_TSTAMP_ALIGNED;
738 #ifdef CONFIG_TCP_MD5SIG
739 if (key)
740 tot_len += TCPOLEN_MD5SIG_ALIGNED;
741 #endif
742
743 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
744 GFP_ATOMIC);
745 if (buff == NULL)
746 return;
747
748 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
749
750 t1 = (struct tcphdr *) skb_push(buff, tot_len);
751 skb_reset_transport_header(buff);
752
753 /* Swap the send and the receive. */
754 memset(t1, 0, sizeof(*t1));
755 t1->dest = th->source;
756 t1->source = th->dest;
757 t1->doff = tot_len / 4;
758 t1->seq = htonl(seq);
759 t1->ack_seq = htonl(ack);
760 t1->ack = !rst || !th->ack;
761 t1->rst = rst;
762 t1->window = htons(win);
763
764 topt = (__be32 *)(t1 + 1);
765
766 if (tsecr) {
767 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
768 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
769 *topt++ = htonl(tsval);
770 *topt++ = htonl(tsecr);
771 }
772
773 #ifdef CONFIG_TCP_MD5SIG
774 if (key) {
775 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
776 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
777 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
778 &ipv6_hdr(skb)->saddr,
779 &ipv6_hdr(skb)->daddr, t1);
780 }
781 #endif
782
783 memset(&fl6, 0, sizeof(fl6));
784 fl6.daddr = ipv6_hdr(skb)->saddr;
785 fl6.saddr = ipv6_hdr(skb)->daddr;
786
787 buff->ip_summed = CHECKSUM_PARTIAL;
788 buff->csum = 0;
789
790 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
791
792 fl6.flowi6_proto = IPPROTO_TCP;
793 if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL)
794 fl6.flowi6_oif = inet6_iif(skb);
795 fl6.fl6_dport = t1->dest;
796 fl6.fl6_sport = t1->source;
797 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
798
799 /* Pass a socket to ip6_dst_lookup either it is for RST
800 * Underlying function will use this to retrieve the network
801 * namespace
802 */
803 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
804 if (!IS_ERR(dst)) {
805 skb_dst_set(buff, dst);
806 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
807 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
808 if (rst)
809 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
810 return;
811 }
812
813 kfree_skb(buff);
814 }
815
816 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
817 {
818 const struct tcphdr *th = tcp_hdr(skb);
819 u32 seq = 0, ack_seq = 0;
820 struct tcp_md5sig_key *key = NULL;
821 #ifdef CONFIG_TCP_MD5SIG
822 const __u8 *hash_location = NULL;
823 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
824 unsigned char newhash[16];
825 int genhash;
826 struct sock *sk1 = NULL;
827 #endif
828
829 if (th->rst)
830 return;
831
832 if (!ipv6_unicast_destination(skb))
833 return;
834
835 #ifdef CONFIG_TCP_MD5SIG
836 hash_location = tcp_parse_md5sig_option(th);
837 if (!sk && hash_location) {
838 /*
839 * active side is lost. Try to find listening socket through
840 * source port, and then find md5 key through listening socket.
841 * we are not loose security here:
842 * Incoming packet is checked with md5 hash with finding key,
843 * no RST generated if md5 hash doesn't match.
844 */
845 sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
846 &tcp_hashinfo, &ipv6h->saddr,
847 th->source, &ipv6h->daddr,
848 ntohs(th->source), inet6_iif(skb));
849 if (!sk1)
850 return;
851
852 rcu_read_lock();
853 key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
854 if (!key)
855 goto release_sk1;
856
857 genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb);
858 if (genhash || memcmp(hash_location, newhash, 16) != 0)
859 goto release_sk1;
860 } else {
861 key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL;
862 }
863 #endif
864
865 if (th->ack)
866 seq = ntohl(th->ack_seq);
867 else
868 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
869 (th->doff << 2);
870
871 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0);
872
873 #ifdef CONFIG_TCP_MD5SIG
874 release_sk1:
875 if (sk1) {
876 rcu_read_unlock();
877 sock_put(sk1);
878 }
879 #endif
880 }
881
882 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
883 u32 win, u32 tsval, u32 tsecr,
884 struct tcp_md5sig_key *key, u8 tclass)
885 {
886 tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass);
887 }
888
889 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
890 {
891 struct inet_timewait_sock *tw = inet_twsk(sk);
892 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
893
894 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
895 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
896 tcp_time_stamp + tcptw->tw_ts_offset,
897 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
898 tw->tw_tclass);
899
900 inet_twsk_put(tw);
901 }
902
903 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
904 struct request_sock *req)
905 {
906 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1,
907 req->rcv_wnd, tcp_time_stamp, req->ts_recent,
908 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
909 }
910
911
912 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
913 {
914 struct request_sock *req, **prev;
915 const struct tcphdr *th = tcp_hdr(skb);
916 struct sock *nsk;
917
918 /* Find possible connection requests. */
919 req = inet6_csk_search_req(sk, &prev, th->source,
920 &ipv6_hdr(skb)->saddr,
921 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
922 if (req)
923 return tcp_check_req(sk, skb, req, prev, false);
924
925 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
926 &ipv6_hdr(skb)->saddr, th->source,
927 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
928
929 if (nsk) {
930 if (nsk->sk_state != TCP_TIME_WAIT) {
931 bh_lock_sock(nsk);
932 return nsk;
933 }
934 inet_twsk_put(inet_twsk(nsk));
935 return NULL;
936 }
937
938 #ifdef CONFIG_SYN_COOKIES
939 if (!th->syn)
940 sk = cookie_v6_check(sk, skb);
941 #endif
942 return sk;
943 }
944
945 /* FIXME: this is substantially similar to the ipv4 code.
946 * Can some kind of merge be done? -- erics
947 */
948 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
949 {
950 struct tcp_options_received tmp_opt;
951 struct request_sock *req;
952 struct inet6_request_sock *treq;
953 struct ipv6_pinfo *np = inet6_sk(sk);
954 struct tcp_sock *tp = tcp_sk(sk);
955 __u32 isn = TCP_SKB_CB(skb)->when;
956 struct dst_entry *dst = NULL;
957 struct flowi6 fl6;
958 bool want_cookie = false;
959
960 if (skb->protocol == htons(ETH_P_IP))
961 return tcp_v4_conn_request(sk, skb);
962
963 if (!ipv6_unicast_destination(skb))
964 goto drop;
965
966 if ((sysctl_tcp_syncookies == 2 ||
967 inet_csk_reqsk_queue_is_full(sk)) && !isn) {
968 want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
969 if (!want_cookie)
970 goto drop;
971 }
972
973 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) {
974 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
975 goto drop;
976 }
977
978 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
979 if (req == NULL)
980 goto drop;
981
982 #ifdef CONFIG_TCP_MD5SIG
983 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
984 #endif
985
986 tcp_clear_options(&tmp_opt);
987 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
988 tmp_opt.user_mss = tp->rx_opt.user_mss;
989 tcp_parse_options(skb, &tmp_opt, 0, NULL);
990
991 if (want_cookie && !tmp_opt.saw_tstamp)
992 tcp_clear_options(&tmp_opt);
993
994 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
995 tcp_openreq_init(req, &tmp_opt, skb);
996
997 treq = inet6_rsk(req);
998 treq->rmt_addr = ipv6_hdr(skb)->saddr;
999 treq->loc_addr = ipv6_hdr(skb)->daddr;
1000 if (!want_cookie || tmp_opt.tstamp_ok)
1001 TCP_ECN_create_request(req, skb, sock_net(sk));
1002
1003 treq->iif = sk->sk_bound_dev_if;
1004
1005 /* So that link locals have meaning */
1006 if (!sk->sk_bound_dev_if &&
1007 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1008 treq->iif = inet6_iif(skb);
1009
1010 if (!isn) {
1011 if (ipv6_opt_accepted(sk, skb) ||
1012 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1013 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1014 atomic_inc(&skb->users);
1015 treq->pktopts = skb;
1016 }
1017
1018 if (want_cookie) {
1019 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1020 req->cookie_ts = tmp_opt.tstamp_ok;
1021 goto have_isn;
1022 }
1023
1024 /* VJ's idea. We save last timestamp seen
1025 * from the destination in peer table, when entering
1026 * state TIME-WAIT, and check against it before
1027 * accepting new connection request.
1028 *
1029 * If "isn" is not zero, this request hit alive
1030 * timewait bucket, so that all the necessary checks
1031 * are made in the function processing timewait state.
1032 */
1033 if (tmp_opt.saw_tstamp &&
1034 tcp_death_row.sysctl_tw_recycle &&
1035 (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) {
1036 if (!tcp_peer_is_proven(req, dst, true)) {
1037 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
1038 goto drop_and_release;
1039 }
1040 }
1041 /* Kill the following clause, if you dislike this way. */
1042 else if (!sysctl_tcp_syncookies &&
1043 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
1044 (sysctl_max_syn_backlog >> 2)) &&
1045 !tcp_peer_is_proven(req, dst, false)) {
1046 /* Without syncookies last quarter of
1047 * backlog is filled with destinations,
1048 * proven to be alive.
1049 * It means that we continue to communicate
1050 * to destinations, already remembered
1051 * to the moment of synflood.
1052 */
1053 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
1054 &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
1055 goto drop_and_release;
1056 }
1057
1058 isn = tcp_v6_init_sequence(skb);
1059 }
1060 have_isn:
1061 tcp_rsk(req)->snt_isn = isn;
1062
1063 if (security_inet_conn_request(sk, skb, req))
1064 goto drop_and_release;
1065
1066 if (tcp_v6_send_synack(sk, dst, &fl6, req,
1067 skb_get_queue_mapping(skb)) ||
1068 want_cookie)
1069 goto drop_and_free;
1070
1071 tcp_rsk(req)->snt_synack = tcp_time_stamp;
1072 tcp_rsk(req)->listener = NULL;
1073 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1074 return 0;
1075
1076 drop_and_release:
1077 dst_release(dst);
1078 drop_and_free:
1079 reqsk_free(req);
1080 drop:
1081 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1082 return 0; /* don't send reset */
1083 }
1084
1085 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1086 struct request_sock *req,
1087 struct dst_entry *dst)
1088 {
1089 struct inet6_request_sock *treq;
1090 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1091 struct tcp6_sock *newtcp6sk;
1092 struct inet_sock *newinet;
1093 struct tcp_sock *newtp;
1094 struct sock *newsk;
1095 #ifdef CONFIG_TCP_MD5SIG
1096 struct tcp_md5sig_key *key;
1097 #endif
1098 struct flowi6 fl6;
1099
1100 if (skb->protocol == htons(ETH_P_IP)) {
1101 /*
1102 * v6 mapped
1103 */
1104
1105 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1106
1107 if (newsk == NULL)
1108 return NULL;
1109
1110 newtcp6sk = (struct tcp6_sock *)newsk;
1111 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1112
1113 newinet = inet_sk(newsk);
1114 newnp = inet6_sk(newsk);
1115 newtp = tcp_sk(newsk);
1116
1117 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1118
1119 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
1120
1121 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
1122
1123 newnp->rcv_saddr = newnp->saddr;
1124
1125 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1126 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1127 #ifdef CONFIG_TCP_MD5SIG
1128 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1129 #endif
1130
1131 newnp->ipv6_ac_list = NULL;
1132 newnp->ipv6_fl_list = NULL;
1133 newnp->pktoptions = NULL;
1134 newnp->opt = NULL;
1135 newnp->mcast_oif = inet6_iif(skb);
1136 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1137 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));
1138
1139 /*
1140 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1141 * here, tcp_create_openreq_child now does this for us, see the comment in
1142 * that function for the gory details. -acme
1143 */
1144
1145 /* It is tricky place. Until this moment IPv4 tcp
1146 worked with IPv6 icsk.icsk_af_ops.
1147 Sync it now.
1148 */
1149 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1150
1151 return newsk;
1152 }
1153
1154 treq = inet6_rsk(req);
1155
1156 if (sk_acceptq_is_full(sk))
1157 goto out_overflow;
1158
1159 if (!dst) {
1160 dst = inet6_csk_route_req(sk, &fl6, req);
1161 if (!dst)
1162 goto out;
1163 }
1164
1165 newsk = tcp_create_openreq_child(sk, req, skb);
1166 if (newsk == NULL)
1167 goto out_nonewsk;
1168
1169 /*
1170 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1171 * count here, tcp_create_openreq_child now does this for us, see the
1172 * comment in that function for the gory details. -acme
1173 */
1174
1175 newsk->sk_gso_type = SKB_GSO_TCPV6;
1176 __ip6_dst_store(newsk, dst, NULL, NULL);
1177 inet6_sk_rx_dst_set(newsk, skb);
1178
1179 newtcp6sk = (struct tcp6_sock *)newsk;
1180 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1181
1182 newtp = tcp_sk(newsk);
1183 newinet = inet_sk(newsk);
1184 newnp = inet6_sk(newsk);
1185
1186 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1187
1188 newnp->daddr = treq->rmt_addr;
1189 newnp->saddr = treq->loc_addr;
1190 newnp->rcv_saddr = treq->loc_addr;
1191 newsk->sk_bound_dev_if = treq->iif;
1192
1193 /* Now IPv6 options...
1194
1195 First: no IPv4 options.
1196 */
1197 newinet->inet_opt = NULL;
1198 newnp->ipv6_ac_list = NULL;
1199 newnp->ipv6_fl_list = NULL;
1200
1201 /* Clone RX bits */
1202 newnp->rxopt.all = np->rxopt.all;
1203
1204 /* Clone pktoptions received with SYN */
1205 newnp->pktoptions = NULL;
1206 if (treq->pktopts != NULL) {
1207 newnp->pktoptions = skb_clone(treq->pktopts,
1208 sk_gfp_atomic(sk, GFP_ATOMIC));
1209 consume_skb(treq->pktopts);
1210 treq->pktopts = NULL;
1211 if (newnp->pktoptions)
1212 skb_set_owner_r(newnp->pktoptions, newsk);
1213 }
1214 newnp->opt = NULL;
1215 newnp->mcast_oif = inet6_iif(skb);
1216 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1217 newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));
1218
1219 /* Clone native IPv6 options from listening socket (if any)
1220
1221 Yes, keeping reference count would be much more clever,
1222 but we make one more one thing there: reattach optmem
1223 to newsk.
1224 */
1225 if (np->opt)
1226 newnp->opt = ipv6_dup_options(newsk, np->opt);
1227
1228 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1229 if (newnp->opt)
1230 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1231 newnp->opt->opt_flen);
1232
1233 tcp_mtup_init(newsk);
1234 tcp_sync_mss(newsk, dst_mtu(dst));
1235 newtp->advmss = dst_metric_advmss(dst);
1236 if (tcp_sk(sk)->rx_opt.user_mss &&
1237 tcp_sk(sk)->rx_opt.user_mss < newtp->advmss)
1238 newtp->advmss = tcp_sk(sk)->rx_opt.user_mss;
1239
1240 tcp_initialize_rcv_mss(newsk);
1241
1242 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1243 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1244
1245 #ifdef CONFIG_TCP_MD5SIG
1246 /* Copy over the MD5 key from the original socket */
1247 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1248 /* We're using one, so create a matching key
1249 * on the newsk structure. If we fail to get
1250 * memory, then we end up not copying the key
1251 * across. Shucks.
1252 */
1253 tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr,
1254 AF_INET6, key->key, key->keylen,
1255 sk_gfp_atomic(sk, GFP_ATOMIC));
1256 }
1257 #endif
1258
1259 if (__inet_inherit_port(sk, newsk) < 0) {
1260 inet_csk_prepare_forced_close(newsk);
1261 tcp_done(newsk);
1262 goto out;
1263 }
1264 __inet6_hash(newsk, NULL);
1265
1266 return newsk;
1267
1268 out_overflow:
1269 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1270 out_nonewsk:
1271 dst_release(dst);
1272 out:
1273 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1274 return NULL;
1275 }
1276
1277 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1278 {
1279 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1280 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1281 &ipv6_hdr(skb)->daddr, skb->csum)) {
1282 skb->ip_summed = CHECKSUM_UNNECESSARY;
1283 return 0;
1284 }
1285 }
1286
1287 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1288 &ipv6_hdr(skb)->saddr,
1289 &ipv6_hdr(skb)->daddr, 0));
1290
1291 if (skb->len <= 76) {
1292 return __skb_checksum_complete(skb);
1293 }
1294 return 0;
1295 }
1296
1297 /* The socket must have it's spinlock held when we get
1298 * here.
1299 *
1300 * We have a potential double-lock case here, so even when
1301 * doing backlog processing we use the BH locking scheme.
1302 * This is because we cannot sleep with the original spinlock
1303 * held.
1304 */
1305 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1306 {
1307 struct ipv6_pinfo *np = inet6_sk(sk);
1308 struct tcp_sock *tp;
1309 struct sk_buff *opt_skb = NULL;
1310
1311 /* Imagine: socket is IPv6. IPv4 packet arrives,
1312 goes to IPv4 receive handler and backlogged.
1313 From backlog it always goes here. Kerboom...
1314 Fortunately, tcp_rcv_established and rcv_established
1315 handle them correctly, but it is not case with
1316 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1317 */
1318
1319 if (skb->protocol == htons(ETH_P_IP))
1320 return tcp_v4_do_rcv(sk, skb);
1321
1322 #ifdef CONFIG_TCP_MD5SIG
1323 if (tcp_v6_inbound_md5_hash (sk, skb))
1324 goto discard;
1325 #endif
1326
1327 if (sk_filter(sk, skb))
1328 goto discard;
1329
1330 /*
1331 * socket locking is here for SMP purposes as backlog rcv
1332 * is currently called with bh processing disabled.
1333 */
1334
1335 /* Do Stevens' IPV6_PKTOPTIONS.
1336
1337 Yes, guys, it is the only place in our code, where we
1338 may make it not affecting IPv4.
1339 The rest of code is protocol independent,
1340 and I do not like idea to uglify IPv4.
1341
1342 Actually, all the idea behind IPV6_PKTOPTIONS
1343 looks not very well thought. For now we latch
1344 options, received in the last packet, enqueued
1345 by tcp. Feel free to propose better solution.
1346 --ANK (980728)
1347 */
1348 if (np->rxopt.all)
1349 opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC));
1350
1351 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1352 struct dst_entry *dst = sk->sk_rx_dst;
1353
1354 sock_rps_save_rxhash(sk, skb);
1355 if (dst) {
1356 if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif ||
1357 dst->ops->check(dst, np->rx_dst_cookie) == NULL) {
1358 dst_release(dst);
1359 sk->sk_rx_dst = NULL;
1360 }
1361 }
1362
1363 tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len);
1364 if (opt_skb)
1365 goto ipv6_pktoptions;
1366 return 0;
1367 }
1368
1369 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1370 goto csum_err;
1371
1372 if (sk->sk_state == TCP_LISTEN) {
1373 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1374 if (!nsk)
1375 goto discard;
1376
1377 /*
1378 * Queue it on the new socket if the new socket is active,
1379 * otherwise we just shortcircuit this and continue with
1380 * the new socket..
1381 */
1382 if(nsk != sk) {
1383 sock_rps_save_rxhash(nsk, skb);
1384 if (tcp_child_process(sk, nsk, skb))
1385 goto reset;
1386 if (opt_skb)
1387 __kfree_skb(opt_skb);
1388 return 0;
1389 }
1390 } else
1391 sock_rps_save_rxhash(sk, skb);
1392
1393 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1394 goto reset;
1395 if (opt_skb)
1396 goto ipv6_pktoptions;
1397 return 0;
1398
1399 reset:
1400 tcp_v6_send_reset(sk, skb);
1401 discard:
1402 if (opt_skb)
1403 __kfree_skb(opt_skb);
1404 kfree_skb(skb);
1405 return 0;
1406 csum_err:
1407 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS);
1408 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1409 goto discard;
1410
1411
1412 ipv6_pktoptions:
1413 /* Do you ask, what is it?
1414
1415 1. skb was enqueued by tcp.
1416 2. skb is added to tail of read queue, rather than out of order.
1417 3. socket is not in passive state.
1418 4. Finally, it really contains options, which user wants to receive.
1419 */
1420 tp = tcp_sk(sk);
1421 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1422 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1423 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1424 np->mcast_oif = inet6_iif(opt_skb);
1425 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1426 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1427 if (np->rxopt.bits.rxtclass)
1428 np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb));
1429 if (ipv6_opt_accepted(sk, opt_skb)) {
1430 skb_set_owner_r(opt_skb, sk);
1431 opt_skb = xchg(&np->pktoptions, opt_skb);
1432 } else {
1433 __kfree_skb(opt_skb);
1434 opt_skb = xchg(&np->pktoptions, NULL);
1435 }
1436 }
1437
1438 kfree_skb(opt_skb);
1439 return 0;
1440 }
1441
1442 static int tcp_v6_rcv(struct sk_buff *skb)
1443 {
1444 const struct tcphdr *th;
1445 const struct ipv6hdr *hdr;
1446 struct sock *sk;
1447 int ret;
1448 struct net *net = dev_net(skb->dev);
1449
1450 if (skb->pkt_type != PACKET_HOST)
1451 goto discard_it;
1452
1453 /*
1454 * Count it even if it's bad.
1455 */
1456 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1457
1458 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1459 goto discard_it;
1460
1461 th = tcp_hdr(skb);
1462
1463 if (th->doff < sizeof(struct tcphdr)/4)
1464 goto bad_packet;
1465 if (!pskb_may_pull(skb, th->doff*4))
1466 goto discard_it;
1467
1468 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1469 goto csum_error;
1470
1471 th = tcp_hdr(skb);
1472 hdr = ipv6_hdr(skb);
1473 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1474 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1475 skb->len - th->doff*4);
1476 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1477 TCP_SKB_CB(skb)->when = 0;
1478 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1479 TCP_SKB_CB(skb)->sacked = 0;
1480
1481 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1482 if (!sk)
1483 goto no_tcp_socket;
1484
1485 process:
1486 if (sk->sk_state == TCP_TIME_WAIT)
1487 goto do_time_wait;
1488
1489 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1490 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1491 goto discard_and_relse;
1492 }
1493
1494 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1495 goto discard_and_relse;
1496
1497 if (sk_filter(sk, skb))
1498 goto discard_and_relse;
1499
1500 sk_mark_napi_id(sk, skb);
1501 skb->dev = NULL;
1502
1503 bh_lock_sock_nested(sk);
1504 ret = 0;
1505 if (!sock_owned_by_user(sk)) {
1506 #ifdef CONFIG_NET_DMA
1507 struct tcp_sock *tp = tcp_sk(sk);
1508 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1509 tp->ucopy.dma_chan = net_dma_find_channel();
1510 if (tp->ucopy.dma_chan)
1511 ret = tcp_v6_do_rcv(sk, skb);
1512 else
1513 #endif
1514 {
1515 if (!tcp_prequeue(sk, skb))
1516 ret = tcp_v6_do_rcv(sk, skb);
1517 }
1518 } else if (unlikely(sk_add_backlog(sk, skb,
1519 sk->sk_rcvbuf + sk->sk_sndbuf))) {
1520 bh_unlock_sock(sk);
1521 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
1522 goto discard_and_relse;
1523 }
1524 bh_unlock_sock(sk);
1525
1526 sock_put(sk);
1527 return ret ? -1 : 0;
1528
1529 no_tcp_socket:
1530 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1531 goto discard_it;
1532
1533 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1534 csum_error:
1535 TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS);
1536 bad_packet:
1537 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1538 } else {
1539 tcp_v6_send_reset(NULL, skb);
1540 }
1541
1542 discard_it:
1543 kfree_skb(skb);
1544 return 0;
1545
1546 discard_and_relse:
1547 sock_put(sk);
1548 goto discard_it;
1549
1550 do_time_wait:
1551 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1552 inet_twsk_put(inet_twsk(sk));
1553 goto discard_it;
1554 }
1555
1556 if (skb->len < (th->doff<<2)) {
1557 inet_twsk_put(inet_twsk(sk));
1558 goto bad_packet;
1559 }
1560 if (tcp_checksum_complete(skb)) {
1561 inet_twsk_put(inet_twsk(sk));
1562 goto csum_error;
1563 }
1564
1565 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1566 case TCP_TW_SYN:
1567 {
1568 struct sock *sk2;
1569
1570 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1571 &ipv6_hdr(skb)->saddr, th->source,
1572 &ipv6_hdr(skb)->daddr,
1573 ntohs(th->dest), inet6_iif(skb));
1574 if (sk2 != NULL) {
1575 struct inet_timewait_sock *tw = inet_twsk(sk);
1576 inet_twsk_deschedule(tw, &tcp_death_row);
1577 inet_twsk_put(tw);
1578 sk = sk2;
1579 goto process;
1580 }
1581 /* Fall through to ACK */
1582 }
1583 case TCP_TW_ACK:
1584 tcp_v6_timewait_ack(sk, skb);
1585 break;
1586 case TCP_TW_RST:
1587 goto no_tcp_socket;
1588 case TCP_TW_SUCCESS:;
1589 }
1590 goto discard_it;
1591 }
1592
1593 static void tcp_v6_early_demux(struct sk_buff *skb)
1594 {
1595 const struct ipv6hdr *hdr;
1596 const struct tcphdr *th;
1597 struct sock *sk;
1598
1599 if (skb->pkt_type != PACKET_HOST)
1600 return;
1601
1602 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr)))
1603 return;
1604
1605 hdr = ipv6_hdr(skb);
1606 th = tcp_hdr(skb);
1607
1608 if (th->doff < sizeof(struct tcphdr) / 4)
1609 return;
1610
1611 sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo,
1612 &hdr->saddr, th->source,
1613 &hdr->daddr, ntohs(th->dest),
1614 inet6_iif(skb));
1615 if (sk) {
1616 skb->sk = sk;
1617 skb->destructor = sock_edemux;
1618 if (sk->sk_state != TCP_TIME_WAIT) {
1619 struct dst_entry *dst = sk->sk_rx_dst;
1620
1621 if (dst)
1622 dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie);
1623 if (dst &&
1624 inet_sk(sk)->rx_dst_ifindex == skb->skb_iif)
1625 skb_dst_set_noref(skb, dst);
1626 }
1627 }
1628 }
1629
1630 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1631 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1632 .twsk_unique = tcp_twsk_unique,
1633 .twsk_destructor= tcp_twsk_destructor,
1634 };
1635
1636 static const struct inet_connection_sock_af_ops ipv6_specific = {
1637 .queue_xmit = inet6_csk_xmit,
1638 .send_check = tcp_v6_send_check,
1639 .rebuild_header = inet6_sk_rebuild_header,
1640 .sk_rx_dst_set = inet6_sk_rx_dst_set,
1641 .conn_request = tcp_v6_conn_request,
1642 .syn_recv_sock = tcp_v6_syn_recv_sock,
1643 .net_header_len = sizeof(struct ipv6hdr),
1644 .net_frag_header_len = sizeof(struct frag_hdr),
1645 .setsockopt = ipv6_setsockopt,
1646 .getsockopt = ipv6_getsockopt,
1647 .addr2sockaddr = inet6_csk_addr2sockaddr,
1648 .sockaddr_len = sizeof(struct sockaddr_in6),
1649 .bind_conflict = inet6_csk_bind_conflict,
1650 #ifdef CONFIG_COMPAT
1651 .compat_setsockopt = compat_ipv6_setsockopt,
1652 .compat_getsockopt = compat_ipv6_getsockopt,
1653 #endif
1654 };
1655
1656 #ifdef CONFIG_TCP_MD5SIG
1657 static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1658 .md5_lookup = tcp_v6_md5_lookup,
1659 .calc_md5_hash = tcp_v6_md5_hash_skb,
1660 .md5_parse = tcp_v6_parse_md5_keys,
1661 };
1662 #endif
1663
1664 /*
1665 * TCP over IPv4 via INET6 API
1666 */
1667
1668 static const struct inet_connection_sock_af_ops ipv6_mapped = {
1669 .queue_xmit = ip_queue_xmit,
1670 .send_check = tcp_v4_send_check,
1671 .rebuild_header = inet_sk_rebuild_header,
1672 .sk_rx_dst_set = inet_sk_rx_dst_set,
1673 .conn_request = tcp_v6_conn_request,
1674 .syn_recv_sock = tcp_v6_syn_recv_sock,
1675 .net_header_len = sizeof(struct iphdr),
1676 .setsockopt = ipv6_setsockopt,
1677 .getsockopt = ipv6_getsockopt,
1678 .addr2sockaddr = inet6_csk_addr2sockaddr,
1679 .sockaddr_len = sizeof(struct sockaddr_in6),
1680 .bind_conflict = inet6_csk_bind_conflict,
1681 #ifdef CONFIG_COMPAT
1682 .compat_setsockopt = compat_ipv6_setsockopt,
1683 .compat_getsockopt = compat_ipv6_getsockopt,
1684 #endif
1685 };
1686
1687 #ifdef CONFIG_TCP_MD5SIG
1688 static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1689 .md5_lookup = tcp_v4_md5_lookup,
1690 .calc_md5_hash = tcp_v4_md5_hash_skb,
1691 .md5_parse = tcp_v6_parse_md5_keys,
1692 };
1693 #endif
1694
1695 /* NOTE: A lot of things set to zero explicitly by call to
1696 * sk_alloc() so need not be done here.
1697 */
1698 static int tcp_v6_init_sock(struct sock *sk)
1699 {
1700 struct inet_connection_sock *icsk = inet_csk(sk);
1701
1702 tcp_init_sock(sk);
1703
1704 icsk->icsk_af_ops = &ipv6_specific;
1705
1706 #ifdef CONFIG_TCP_MD5SIG
1707 tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific;
1708 #endif
1709
1710 return 0;
1711 }
1712
1713 static void tcp_v6_destroy_sock(struct sock *sk)
1714 {
1715 tcp_v4_destroy_sock(sk);
1716 inet6_destroy_sock(sk);
1717 }
1718
1719 #ifdef CONFIG_PROC_FS
1720 /* Proc filesystem TCPv6 sock list dumping. */
1721 static void get_openreq6(struct seq_file *seq,
1722 const struct sock *sk, struct request_sock *req, int i, kuid_t uid)
1723 {
1724 int ttd = req->expires - jiffies;
1725 const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1726 const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1727
1728 if (ttd < 0)
1729 ttd = 0;
1730
1731 seq_printf(seq,
1732 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1733 "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n",
1734 i,
1735 src->s6_addr32[0], src->s6_addr32[1],
1736 src->s6_addr32[2], src->s6_addr32[3],
1737 ntohs(inet_rsk(req)->loc_port),
1738 dest->s6_addr32[0], dest->s6_addr32[1],
1739 dest->s6_addr32[2], dest->s6_addr32[3],
1740 ntohs(inet_rsk(req)->rmt_port),
1741 TCP_SYN_RECV,
1742 0,0, /* could print option size, but that is af dependent. */
1743 1, /* timers active (only the expire timer) */
1744 jiffies_to_clock_t(ttd),
1745 req->num_timeout,
1746 from_kuid_munged(seq_user_ns(seq), uid),
1747 0, /* non standard timer */
1748 0, /* open_requests have no inode */
1749 0, req);
1750 }
1751
1752 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1753 {
1754 const struct in6_addr *dest, *src;
1755 __u16 destp, srcp;
1756 int timer_active;
1757 unsigned long timer_expires;
1758 const struct inet_sock *inet = inet_sk(sp);
1759 const struct tcp_sock *tp = tcp_sk(sp);
1760 const struct inet_connection_sock *icsk = inet_csk(sp);
1761 const struct ipv6_pinfo *np = inet6_sk(sp);
1762
1763 dest = &np->daddr;
1764 src = &np->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 const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1814 s32 delta = tw->tw_ttd - inet_tw_time_stamp();
1815
1816 dest = &tw6->tw_v6_daddr;
1817 src = &tw6->tw_v6_rcv_saddr;
1818 destp = ntohs(tw->tw_dport);
1819 srcp = ntohs(tw->tw_sport);
1820
1821 seq_printf(seq,
1822 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1823 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1824 i,
1825 src->s6_addr32[0], src->s6_addr32[1],
1826 src->s6_addr32[2], src->s6_addr32[3], srcp,
1827 dest->s6_addr32[0], dest->s6_addr32[1],
1828 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1829 tw->tw_substate, 0, 0,
1830 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0,
1831 atomic_read(&tw->tw_refcnt), tw);
1832 }
1833
1834 static int tcp6_seq_show(struct seq_file *seq, void *v)
1835 {
1836 struct tcp_iter_state *st;
1837 struct sock *sk = v;
1838
1839 if (v == SEQ_START_TOKEN) {
1840 seq_puts(seq,
1841 " sl "
1842 "local_address "
1843 "remote_address "
1844 "st tx_queue rx_queue tr tm->when retrnsmt"
1845 " uid timeout inode\n");
1846 goto out;
1847 }
1848 st = seq->private;
1849
1850 switch (st->state) {
1851 case TCP_SEQ_STATE_LISTENING:
1852 case TCP_SEQ_STATE_ESTABLISHED:
1853 if (sk->sk_state == TCP_TIME_WAIT)
1854 get_timewait6_sock(seq, v, st->num);
1855 else
1856 get_tcp6_sock(seq, v, st->num);
1857 break;
1858 case TCP_SEQ_STATE_OPENREQ:
1859 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
1860 break;
1861 }
1862 out:
1863 return 0;
1864 }
1865
1866 static const struct file_operations tcp6_afinfo_seq_fops = {
1867 .owner = THIS_MODULE,
1868 .open = tcp_seq_open,
1869 .read = seq_read,
1870 .llseek = seq_lseek,
1871 .release = seq_release_net
1872 };
1873
1874 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1875 .name = "tcp6",
1876 .family = AF_INET6,
1877 .seq_fops = &tcp6_afinfo_seq_fops,
1878 .seq_ops = {
1879 .show = tcp6_seq_show,
1880 },
1881 };
1882
1883 int __net_init tcp6_proc_init(struct net *net)
1884 {
1885 return tcp_proc_register(net, &tcp6_seq_afinfo);
1886 }
1887
1888 void tcp6_proc_exit(struct net *net)
1889 {
1890 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1891 }
1892 #endif
1893
1894 static void tcp_v6_clear_sk(struct sock *sk, int size)
1895 {
1896 struct inet_sock *inet = inet_sk(sk);
1897
1898 /* we do not want to clear pinet6 field, because of RCU lookups */
1899 sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6));
1900
1901 size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6);
1902 memset(&inet->pinet6 + 1, 0, size);
1903 }
1904
1905 struct proto tcpv6_prot = {
1906 .name = "TCPv6",
1907 .owner = THIS_MODULE,
1908 .close = tcp_close,
1909 .connect = tcp_v6_connect,
1910 .disconnect = tcp_disconnect,
1911 .accept = inet_csk_accept,
1912 .ioctl = tcp_ioctl,
1913 .init = tcp_v6_init_sock,
1914 .destroy = tcp_v6_destroy_sock,
1915 .shutdown = tcp_shutdown,
1916 .setsockopt = tcp_setsockopt,
1917 .getsockopt = tcp_getsockopt,
1918 .recvmsg = tcp_recvmsg,
1919 .sendmsg = tcp_sendmsg,
1920 .sendpage = tcp_sendpage,
1921 .backlog_rcv = tcp_v6_do_rcv,
1922 .release_cb = tcp_release_cb,
1923 .mtu_reduced = tcp_v6_mtu_reduced,
1924 .hash = tcp_v6_hash,
1925 .unhash = inet_unhash,
1926 .get_port = inet_csk_get_port,
1927 .enter_memory_pressure = tcp_enter_memory_pressure,
1928 .stream_memory_free = tcp_stream_memory_free,
1929 .sockets_allocated = &tcp_sockets_allocated,
1930 .memory_allocated = &tcp_memory_allocated,
1931 .memory_pressure = &tcp_memory_pressure,
1932 .orphan_count = &tcp_orphan_count,
1933 .sysctl_wmem = sysctl_tcp_wmem,
1934 .sysctl_rmem = sysctl_tcp_rmem,
1935 .max_header = MAX_TCP_HEADER,
1936 .obj_size = sizeof(struct tcp6_sock),
1937 .slab_flags = SLAB_DESTROY_BY_RCU,
1938 .twsk_prot = &tcp6_timewait_sock_ops,
1939 .rsk_prot = &tcp6_request_sock_ops,
1940 .h.hashinfo = &tcp_hashinfo,
1941 .no_autobind = true,
1942 #ifdef CONFIG_COMPAT
1943 .compat_setsockopt = compat_tcp_setsockopt,
1944 .compat_getsockopt = compat_tcp_getsockopt,
1945 #endif
1946 #ifdef CONFIG_MEMCG_KMEM
1947 .proto_cgroup = tcp_proto_cgroup,
1948 #endif
1949 .clear_sk = tcp_v6_clear_sk,
1950 };
1951
1952 static const struct inet6_protocol tcpv6_protocol = {
1953 .early_demux = tcp_v6_early_demux,
1954 .handler = tcp_v6_rcv,
1955 .err_handler = tcp_v6_err,
1956 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1957 };
1958
1959 static struct inet_protosw tcpv6_protosw = {
1960 .type = SOCK_STREAM,
1961 .protocol = IPPROTO_TCP,
1962 .prot = &tcpv6_prot,
1963 .ops = &inet6_stream_ops,
1964 .no_check = 0,
1965 .flags = INET_PROTOSW_PERMANENT |
1966 INET_PROTOSW_ICSK,
1967 };
1968
1969 static int __net_init tcpv6_net_init(struct net *net)
1970 {
1971 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
1972 SOCK_RAW, IPPROTO_TCP, net);
1973 }
1974
1975 static void __net_exit tcpv6_net_exit(struct net *net)
1976 {
1977 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
1978 }
1979
1980 static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
1981 {
1982 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
1983 }
1984
1985 static struct pernet_operations tcpv6_net_ops = {
1986 .init = tcpv6_net_init,
1987 .exit = tcpv6_net_exit,
1988 .exit_batch = tcpv6_net_exit_batch,
1989 };
1990
1991 int __init tcpv6_init(void)
1992 {
1993 int ret;
1994
1995 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
1996 if (ret)
1997 goto out;
1998
1999 /* register inet6 protocol */
2000 ret = inet6_register_protosw(&tcpv6_protosw);
2001 if (ret)
2002 goto out_tcpv6_protocol;
2003
2004 ret = register_pernet_subsys(&tcpv6_net_ops);
2005 if (ret)
2006 goto out_tcpv6_protosw;
2007 out:
2008 return ret;
2009
2010 out_tcpv6_protosw:
2011 inet6_unregister_protosw(&tcpv6_protosw);
2012 out_tcpv6_protocol:
2013 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2014 goto out;
2015 }
2016
2017 void tcpv6_exit(void)
2018 {
2019 unregister_pernet_subsys(&tcpv6_net_ops);
2020 inet6_unregister_protosw(&tcpv6_protosw);
2021 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2022 }
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