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Merge branches 'armv7', 'at91', 'misc' and 'omap' into devel
[deliverable/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 * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
9 *
10 * Based on:
11 * linux/net/ipv4/tcp.c
12 * linux/net/ipv4/tcp_input.c
13 * linux/net/ipv4/tcp_output.c
14 *
15 * Fixes:
16 * Hideaki YOSHIFUJI : sin6_scope_id support
17 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
18 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
19 * a single port at the same time.
20 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/jiffies.h>
35 #include <linux/in.h>
36 #include <linux/in6.h>
37 #include <linux/netdevice.h>
38 #include <linux/init.h>
39 #include <linux/jhash.h>
40 #include <linux/ipsec.h>
41 #include <linux/times.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/addrconf.h>
60 #include <net/snmp.h>
61 #include <net/dsfield.h>
62 #include <net/timewait_sock.h>
63
64 #include <asm/uaccess.h>
65
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68
69 #include <linux/crypto.h>
70 #include <linux/scatterlist.h>
71
72 /* Socket used for sending RSTs and ACKs */
73 static struct socket *tcp6_socket;
74
75 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
76 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
77 static void tcp_v6_send_check(struct sock *sk, int len,
78 struct sk_buff *skb);
79
80 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
81
82 static struct inet_connection_sock_af_ops ipv6_mapped;
83 static struct inet_connection_sock_af_ops ipv6_specific;
84 #ifdef CONFIG_TCP_MD5SIG
85 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
86 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
87 #endif
88
89 static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
90 {
91 return inet_csk_get_port(&tcp_hashinfo, sk, snum,
92 inet6_csk_bind_conflict);
93 }
94
95 static void tcp_v6_hash(struct sock *sk)
96 {
97 if (sk->sk_state != TCP_CLOSE) {
98 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
99 tcp_prot.hash(sk);
100 return;
101 }
102 local_bh_disable();
103 __inet6_hash(&tcp_hashinfo, sk);
104 local_bh_enable();
105 }
106 }
107
108 static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
109 struct in6_addr *saddr,
110 struct in6_addr *daddr,
111 __wsum base)
112 {
113 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
114 }
115
116 static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
117 {
118 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
119 ipv6_hdr(skb)->saddr.s6_addr32,
120 tcp_hdr(skb)->dest,
121 tcp_hdr(skb)->source);
122 }
123
124 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
125 int addr_len)
126 {
127 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
128 struct inet_sock *inet = inet_sk(sk);
129 struct inet_connection_sock *icsk = inet_csk(sk);
130 struct ipv6_pinfo *np = inet6_sk(sk);
131 struct tcp_sock *tp = tcp_sk(sk);
132 struct in6_addr *saddr = NULL, *final_p = NULL, final;
133 struct flowi fl;
134 struct dst_entry *dst;
135 int addr_type;
136 int err;
137
138 if (addr_len < SIN6_LEN_RFC2133)
139 return -EINVAL;
140
141 if (usin->sin6_family != AF_INET6)
142 return(-EAFNOSUPPORT);
143
144 memset(&fl, 0, sizeof(fl));
145
146 if (np->sndflow) {
147 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
148 IP6_ECN_flow_init(fl.fl6_flowlabel);
149 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
150 struct ip6_flowlabel *flowlabel;
151 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
152 if (flowlabel == NULL)
153 return -EINVAL;
154 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
155 fl6_sock_release(flowlabel);
156 }
157 }
158
159 /*
160 * connect() to INADDR_ANY means loopback (BSD'ism).
161 */
162
163 if(ipv6_addr_any(&usin->sin6_addr))
164 usin->sin6_addr.s6_addr[15] = 0x1;
165
166 addr_type = ipv6_addr_type(&usin->sin6_addr);
167
168 if(addr_type & IPV6_ADDR_MULTICAST)
169 return -ENETUNREACH;
170
171 if (addr_type&IPV6_ADDR_LINKLOCAL) {
172 if (addr_len >= sizeof(struct sockaddr_in6) &&
173 usin->sin6_scope_id) {
174 /* If interface is set while binding, indices
175 * must coincide.
176 */
177 if (sk->sk_bound_dev_if &&
178 sk->sk_bound_dev_if != usin->sin6_scope_id)
179 return -EINVAL;
180
181 sk->sk_bound_dev_if = usin->sin6_scope_id;
182 }
183
184 /* Connect to link-local address requires an interface */
185 if (!sk->sk_bound_dev_if)
186 return -EINVAL;
187 }
188
189 if (tp->rx_opt.ts_recent_stamp &&
190 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
191 tp->rx_opt.ts_recent = 0;
192 tp->rx_opt.ts_recent_stamp = 0;
193 tp->write_seq = 0;
194 }
195
196 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
197 np->flow_label = fl.fl6_flowlabel;
198
199 /*
200 * TCP over IPv4
201 */
202
203 if (addr_type == IPV6_ADDR_MAPPED) {
204 u32 exthdrlen = icsk->icsk_ext_hdr_len;
205 struct sockaddr_in sin;
206
207 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
208
209 if (__ipv6_only_sock(sk))
210 return -ENETUNREACH;
211
212 sin.sin_family = AF_INET;
213 sin.sin_port = usin->sin6_port;
214 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
215
216 icsk->icsk_af_ops = &ipv6_mapped;
217 sk->sk_backlog_rcv = tcp_v4_do_rcv;
218 #ifdef CONFIG_TCP_MD5SIG
219 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
220 #endif
221
222 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
223
224 if (err) {
225 icsk->icsk_ext_hdr_len = exthdrlen;
226 icsk->icsk_af_ops = &ipv6_specific;
227 sk->sk_backlog_rcv = tcp_v6_do_rcv;
228 #ifdef CONFIG_TCP_MD5SIG
229 tp->af_specific = &tcp_sock_ipv6_specific;
230 #endif
231 goto failure;
232 } else {
233 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
234 inet->saddr);
235 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
236 inet->rcv_saddr);
237 }
238
239 return err;
240 }
241
242 if (!ipv6_addr_any(&np->rcv_saddr))
243 saddr = &np->rcv_saddr;
244
245 fl.proto = IPPROTO_TCP;
246 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
247 ipv6_addr_copy(&fl.fl6_src,
248 (saddr ? saddr : &np->saddr));
249 fl.oif = sk->sk_bound_dev_if;
250 fl.fl_ip_dport = usin->sin6_port;
251 fl.fl_ip_sport = inet->sport;
252
253 if (np->opt && np->opt->srcrt) {
254 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
255 ipv6_addr_copy(&final, &fl.fl6_dst);
256 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
257 final_p = &final;
258 }
259
260 security_sk_classify_flow(sk, &fl);
261
262 err = ip6_dst_lookup(sk, &dst, &fl);
263 if (err)
264 goto failure;
265 if (final_p)
266 ipv6_addr_copy(&fl.fl6_dst, final_p);
267
268 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
269 goto failure;
270
271 if (saddr == NULL) {
272 saddr = &fl.fl6_src;
273 ipv6_addr_copy(&np->rcv_saddr, saddr);
274 }
275
276 /* set the source address */
277 ipv6_addr_copy(&np->saddr, saddr);
278 inet->rcv_saddr = LOOPBACK4_IPV6;
279
280 sk->sk_gso_type = SKB_GSO_TCPV6;
281 __ip6_dst_store(sk, dst, NULL, NULL);
282
283 icsk->icsk_ext_hdr_len = 0;
284 if (np->opt)
285 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
286 np->opt->opt_nflen);
287
288 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
289
290 inet->dport = usin->sin6_port;
291
292 tcp_set_state(sk, TCP_SYN_SENT);
293 err = inet6_hash_connect(&tcp_death_row, sk);
294 if (err)
295 goto late_failure;
296
297 if (!tp->write_seq)
298 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
299 np->daddr.s6_addr32,
300 inet->sport,
301 inet->dport);
302
303 err = tcp_connect(sk);
304 if (err)
305 goto late_failure;
306
307 return 0;
308
309 late_failure:
310 tcp_set_state(sk, TCP_CLOSE);
311 __sk_dst_reset(sk);
312 failure:
313 inet->dport = 0;
314 sk->sk_route_caps = 0;
315 return err;
316 }
317
318 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
319 int type, int code, int offset, __be32 info)
320 {
321 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
322 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
323 struct ipv6_pinfo *np;
324 struct sock *sk;
325 int err;
326 struct tcp_sock *tp;
327 __u32 seq;
328
329 sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr,
330 th->source, skb->dev->ifindex);
331
332 if (sk == NULL) {
333 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
334 return;
335 }
336
337 if (sk->sk_state == TCP_TIME_WAIT) {
338 inet_twsk_put(inet_twsk(sk));
339 return;
340 }
341
342 bh_lock_sock(sk);
343 if (sock_owned_by_user(sk))
344 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
345
346 if (sk->sk_state == TCP_CLOSE)
347 goto out;
348
349 tp = tcp_sk(sk);
350 seq = ntohl(th->seq);
351 if (sk->sk_state != TCP_LISTEN &&
352 !between(seq, tp->snd_una, tp->snd_nxt)) {
353 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
354 goto out;
355 }
356
357 np = inet6_sk(sk);
358
359 if (type == ICMPV6_PKT_TOOBIG) {
360 struct dst_entry *dst = NULL;
361
362 if (sock_owned_by_user(sk))
363 goto out;
364 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
365 goto out;
366
367 /* icmp should have updated the destination cache entry */
368 dst = __sk_dst_check(sk, np->dst_cookie);
369
370 if (dst == NULL) {
371 struct inet_sock *inet = inet_sk(sk);
372 struct flowi fl;
373
374 /* BUGGG_FUTURE: Again, it is not clear how
375 to handle rthdr case. Ignore this complexity
376 for now.
377 */
378 memset(&fl, 0, sizeof(fl));
379 fl.proto = IPPROTO_TCP;
380 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
381 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
382 fl.oif = sk->sk_bound_dev_if;
383 fl.fl_ip_dport = inet->dport;
384 fl.fl_ip_sport = inet->sport;
385 security_skb_classify_flow(skb, &fl);
386
387 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
388 sk->sk_err_soft = -err;
389 goto out;
390 }
391
392 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
393 sk->sk_err_soft = -err;
394 goto out;
395 }
396
397 } else
398 dst_hold(dst);
399
400 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
401 tcp_sync_mss(sk, dst_mtu(dst));
402 tcp_simple_retransmit(sk);
403 } /* else let the usual retransmit timer handle it */
404 dst_release(dst);
405 goto out;
406 }
407
408 icmpv6_err_convert(type, code, &err);
409
410 /* Might be for an request_sock */
411 switch (sk->sk_state) {
412 struct request_sock *req, **prev;
413 case TCP_LISTEN:
414 if (sock_owned_by_user(sk))
415 goto out;
416
417 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
418 &hdr->saddr, inet6_iif(skb));
419 if (!req)
420 goto out;
421
422 /* ICMPs are not backlogged, hence we cannot get
423 * an established socket here.
424 */
425 BUG_TRAP(req->sk == NULL);
426
427 if (seq != tcp_rsk(req)->snt_isn) {
428 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
429 goto out;
430 }
431
432 inet_csk_reqsk_queue_drop(sk, req, prev);
433 goto out;
434
435 case TCP_SYN_SENT:
436 case TCP_SYN_RECV: /* Cannot happen.
437 It can, it SYNs are crossed. --ANK */
438 if (!sock_owned_by_user(sk)) {
439 sk->sk_err = err;
440 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
441
442 tcp_done(sk);
443 } else
444 sk->sk_err_soft = err;
445 goto out;
446 }
447
448 if (!sock_owned_by_user(sk) && np->recverr) {
449 sk->sk_err = err;
450 sk->sk_error_report(sk);
451 } else
452 sk->sk_err_soft = err;
453
454 out:
455 bh_unlock_sock(sk);
456 sock_put(sk);
457 }
458
459
460 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
461 struct dst_entry *dst)
462 {
463 struct inet6_request_sock *treq = inet6_rsk(req);
464 struct ipv6_pinfo *np = inet6_sk(sk);
465 struct sk_buff * skb;
466 struct ipv6_txoptions *opt = NULL;
467 struct in6_addr * final_p = NULL, final;
468 struct flowi fl;
469 int err = -1;
470
471 memset(&fl, 0, sizeof(fl));
472 fl.proto = IPPROTO_TCP;
473 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
474 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
475 fl.fl6_flowlabel = 0;
476 fl.oif = treq->iif;
477 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
478 fl.fl_ip_sport = inet_sk(sk)->sport;
479 security_req_classify_flow(req, &fl);
480
481 if (dst == NULL) {
482 opt = np->opt;
483 if (opt == NULL &&
484 np->rxopt.bits.osrcrt == 2 &&
485 treq->pktopts) {
486 struct sk_buff *pktopts = treq->pktopts;
487 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
488 if (rxopt->srcrt)
489 opt = ipv6_invert_rthdr(sk,
490 (struct ipv6_rt_hdr *)(skb_network_header(pktopts) +
491 rxopt->srcrt));
492 }
493
494 if (opt && opt->srcrt) {
495 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
496 ipv6_addr_copy(&final, &fl.fl6_dst);
497 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
498 final_p = &final;
499 }
500
501 err = ip6_dst_lookup(sk, &dst, &fl);
502 if (err)
503 goto done;
504 if (final_p)
505 ipv6_addr_copy(&fl.fl6_dst, final_p);
506 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
507 goto done;
508 }
509
510 skb = tcp_make_synack(sk, dst, req);
511 if (skb) {
512 struct tcphdr *th = tcp_hdr(skb);
513
514 th->check = tcp_v6_check(th, skb->len,
515 &treq->loc_addr, &treq->rmt_addr,
516 csum_partial((char *)th, skb->len, skb->csum));
517
518 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
519 err = ip6_xmit(sk, skb, &fl, opt, 0);
520 err = net_xmit_eval(err);
521 }
522
523 done:
524 if (opt && opt != np->opt)
525 sock_kfree_s(sk, opt, opt->tot_len);
526 dst_release(dst);
527 return err;
528 }
529
530 static void tcp_v6_reqsk_destructor(struct request_sock *req)
531 {
532 if (inet6_rsk(req)->pktopts)
533 kfree_skb(inet6_rsk(req)->pktopts);
534 }
535
536 #ifdef CONFIG_TCP_MD5SIG
537 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
538 struct in6_addr *addr)
539 {
540 struct tcp_sock *tp = tcp_sk(sk);
541 int i;
542
543 BUG_ON(tp == NULL);
544
545 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
546 return NULL;
547
548 for (i = 0; i < tp->md5sig_info->entries6; i++) {
549 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
550 return (struct tcp_md5sig_key *)&tp->md5sig_info->keys6[i];
551 }
552 return NULL;
553 }
554
555 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
556 struct sock *addr_sk)
557 {
558 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
559 }
560
561 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
562 struct request_sock *req)
563 {
564 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
565 }
566
567 static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
568 char *newkey, u8 newkeylen)
569 {
570 /* Add key to the list */
571 struct tcp6_md5sig_key *key;
572 struct tcp_sock *tp = tcp_sk(sk);
573 struct tcp6_md5sig_key *keys;
574
575 key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer);
576 if (key) {
577 /* modify existing entry - just update that one */
578 kfree(key->key);
579 key->key = newkey;
580 key->keylen = newkeylen;
581 } else {
582 /* reallocate new list if current one is full. */
583 if (!tp->md5sig_info) {
584 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
585 if (!tp->md5sig_info) {
586 kfree(newkey);
587 return -ENOMEM;
588 }
589 }
590 tcp_alloc_md5sig_pool();
591 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
592 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
593 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
594
595 if (!keys) {
596 tcp_free_md5sig_pool();
597 kfree(newkey);
598 return -ENOMEM;
599 }
600
601 if (tp->md5sig_info->entries6)
602 memmove(keys, tp->md5sig_info->keys6,
603 (sizeof (tp->md5sig_info->keys6[0]) *
604 tp->md5sig_info->entries6));
605
606 kfree(tp->md5sig_info->keys6);
607 tp->md5sig_info->keys6 = keys;
608 tp->md5sig_info->alloced6++;
609 }
610
611 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
612 peer);
613 tp->md5sig_info->keys6[tp->md5sig_info->entries6].key = newkey;
614 tp->md5sig_info->keys6[tp->md5sig_info->entries6].keylen = newkeylen;
615
616 tp->md5sig_info->entries6++;
617 }
618 return 0;
619 }
620
621 static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
622 u8 *newkey, __u8 newkeylen)
623 {
624 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
625 newkey, newkeylen);
626 }
627
628 static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
629 {
630 struct tcp_sock *tp = tcp_sk(sk);
631 int i;
632
633 for (i = 0; i < tp->md5sig_info->entries6; i++) {
634 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
635 /* Free the key */
636 kfree(tp->md5sig_info->keys6[i].key);
637 tp->md5sig_info->entries6--;
638
639 if (tp->md5sig_info->entries6 == 0) {
640 kfree(tp->md5sig_info->keys6);
641 tp->md5sig_info->keys6 = NULL;
642
643 tcp_free_md5sig_pool();
644
645 return 0;
646 } else {
647 /* shrink the database */
648 if (tp->md5sig_info->entries6 != i)
649 memmove(&tp->md5sig_info->keys6[i],
650 &tp->md5sig_info->keys6[i+1],
651 (tp->md5sig_info->entries6 - i)
652 * sizeof (tp->md5sig_info->keys6[0]));
653 }
654 }
655 }
656 return -ENOENT;
657 }
658
659 static void tcp_v6_clear_md5_list (struct sock *sk)
660 {
661 struct tcp_sock *tp = tcp_sk(sk);
662 int i;
663
664 if (tp->md5sig_info->entries6) {
665 for (i = 0; i < tp->md5sig_info->entries6; i++)
666 kfree(tp->md5sig_info->keys6[i].key);
667 tp->md5sig_info->entries6 = 0;
668 tcp_free_md5sig_pool();
669 }
670
671 kfree(tp->md5sig_info->keys6);
672 tp->md5sig_info->keys6 = NULL;
673 tp->md5sig_info->alloced6 = 0;
674
675 if (tp->md5sig_info->entries4) {
676 for (i = 0; i < tp->md5sig_info->entries4; i++)
677 kfree(tp->md5sig_info->keys4[i].key);
678 tp->md5sig_info->entries4 = 0;
679 tcp_free_md5sig_pool();
680 }
681
682 kfree(tp->md5sig_info->keys4);
683 tp->md5sig_info->keys4 = NULL;
684 tp->md5sig_info->alloced4 = 0;
685 }
686
687 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
688 int optlen)
689 {
690 struct tcp_md5sig cmd;
691 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
692 u8 *newkey;
693
694 if (optlen < sizeof(cmd))
695 return -EINVAL;
696
697 if (copy_from_user(&cmd, optval, sizeof(cmd)))
698 return -EFAULT;
699
700 if (sin6->sin6_family != AF_INET6)
701 return -EINVAL;
702
703 if (!cmd.tcpm_keylen) {
704 if (!tcp_sk(sk)->md5sig_info)
705 return -ENOENT;
706 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
707 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
708 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
709 }
710
711 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
712 return -EINVAL;
713
714 if (!tcp_sk(sk)->md5sig_info) {
715 struct tcp_sock *tp = tcp_sk(sk);
716 struct tcp_md5sig_info *p;
717
718 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
719 if (!p)
720 return -ENOMEM;
721
722 tp->md5sig_info = p;
723 }
724
725 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
726 if (!newkey)
727 return -ENOMEM;
728 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED) {
729 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
730 newkey, cmd.tcpm_keylen);
731 }
732 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
733 }
734
735 static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
736 struct in6_addr *saddr,
737 struct in6_addr *daddr,
738 struct tcphdr *th, int protocol,
739 int tcplen)
740 {
741 struct scatterlist sg[4];
742 __u16 data_len;
743 int block = 0;
744 __sum16 cksum;
745 struct tcp_md5sig_pool *hp;
746 struct tcp6_pseudohdr *bp;
747 struct hash_desc *desc;
748 int err;
749 unsigned int nbytes = 0;
750
751 hp = tcp_get_md5sig_pool();
752 if (!hp) {
753 printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__);
754 goto clear_hash_noput;
755 }
756 bp = &hp->md5_blk.ip6;
757 desc = &hp->md5_desc;
758
759 /* 1. TCP pseudo-header (RFC2460) */
760 ipv6_addr_copy(&bp->saddr, saddr);
761 ipv6_addr_copy(&bp->daddr, daddr);
762 bp->len = htonl(tcplen);
763 bp->protocol = htonl(protocol);
764
765 sg_set_buf(&sg[block++], bp, sizeof(*bp));
766 nbytes += sizeof(*bp);
767
768 /* 2. TCP header, excluding options */
769 cksum = th->check;
770 th->check = 0;
771 sg_set_buf(&sg[block++], th, sizeof(*th));
772 nbytes += sizeof(*th);
773
774 /* 3. TCP segment data (if any) */
775 data_len = tcplen - (th->doff << 2);
776 if (data_len > 0) {
777 u8 *data = (u8 *)th + (th->doff << 2);
778 sg_set_buf(&sg[block++], data, data_len);
779 nbytes += data_len;
780 }
781
782 /* 4. shared key */
783 sg_set_buf(&sg[block++], key->key, key->keylen);
784 nbytes += key->keylen;
785
786 /* Now store the hash into the packet */
787 err = crypto_hash_init(desc);
788 if (err) {
789 printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
790 goto clear_hash;
791 }
792 err = crypto_hash_update(desc, sg, nbytes);
793 if (err) {
794 printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
795 goto clear_hash;
796 }
797 err = crypto_hash_final(desc, md5_hash);
798 if (err) {
799 printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
800 goto clear_hash;
801 }
802
803 /* Reset header, and free up the crypto */
804 tcp_put_md5sig_pool();
805 th->check = cksum;
806 out:
807 return 0;
808 clear_hash:
809 tcp_put_md5sig_pool();
810 clear_hash_noput:
811 memset(md5_hash, 0, 16);
812 goto out;
813 }
814
815 static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
816 struct sock *sk,
817 struct dst_entry *dst,
818 struct request_sock *req,
819 struct tcphdr *th, int protocol,
820 int tcplen)
821 {
822 struct in6_addr *saddr, *daddr;
823
824 if (sk) {
825 saddr = &inet6_sk(sk)->saddr;
826 daddr = &inet6_sk(sk)->daddr;
827 } else {
828 saddr = &inet6_rsk(req)->loc_addr;
829 daddr = &inet6_rsk(req)->rmt_addr;
830 }
831 return tcp_v6_do_calc_md5_hash(md5_hash, key,
832 saddr, daddr,
833 th, protocol, tcplen);
834 }
835
836 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
837 {
838 __u8 *hash_location = NULL;
839 struct tcp_md5sig_key *hash_expected;
840 struct ipv6hdr *ip6h = ipv6_hdr(skb);
841 struct tcphdr *th = tcp_hdr(skb);
842 int length = (th->doff << 2) - sizeof (*th);
843 int genhash;
844 u8 *ptr;
845 u8 newhash[16];
846
847 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
848
849 /* If the TCP option is too short, we can short cut */
850 if (length < TCPOLEN_MD5SIG)
851 return hash_expected ? 1 : 0;
852
853 /* parse options */
854 ptr = (u8*)(th + 1);
855 while (length > 0) {
856 int opcode = *ptr++;
857 int opsize;
858
859 switch(opcode) {
860 case TCPOPT_EOL:
861 goto done_opts;
862 case TCPOPT_NOP:
863 length--;
864 continue;
865 default:
866 opsize = *ptr++;
867 if (opsize < 2 || opsize > length)
868 goto done_opts;
869 if (opcode == TCPOPT_MD5SIG) {
870 hash_location = ptr;
871 goto done_opts;
872 }
873 }
874 ptr += opsize - 2;
875 length -= opsize;
876 }
877
878 done_opts:
879 /* do we have a hash as expected? */
880 if (!hash_expected) {
881 if (!hash_location)
882 return 0;
883 if (net_ratelimit()) {
884 printk(KERN_INFO "MD5 Hash NOT expected but found "
885 "(" NIP6_FMT ", %u)->"
886 "(" NIP6_FMT ", %u)\n",
887 NIP6(ip6h->saddr), ntohs(th->source),
888 NIP6(ip6h->daddr), ntohs(th->dest));
889 }
890 return 1;
891 }
892
893 if (!hash_location) {
894 if (net_ratelimit()) {
895 printk(KERN_INFO "MD5 Hash expected but NOT found "
896 "(" NIP6_FMT ", %u)->"
897 "(" NIP6_FMT ", %u)\n",
898 NIP6(ip6h->saddr), ntohs(th->source),
899 NIP6(ip6h->daddr), ntohs(th->dest));
900 }
901 return 1;
902 }
903
904 /* check the signature */
905 genhash = tcp_v6_do_calc_md5_hash(newhash,
906 hash_expected,
907 &ip6h->saddr, &ip6h->daddr,
908 th, sk->sk_protocol,
909 skb->len);
910 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
911 if (net_ratelimit()) {
912 printk(KERN_INFO "MD5 Hash %s for "
913 "(" NIP6_FMT ", %u)->"
914 "(" NIP6_FMT ", %u)\n",
915 genhash ? "failed" : "mismatch",
916 NIP6(ip6h->saddr), ntohs(th->source),
917 NIP6(ip6h->daddr), ntohs(th->dest));
918 }
919 return 1;
920 }
921 return 0;
922 }
923 #endif
924
925 static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
926 .family = AF_INET6,
927 .obj_size = sizeof(struct tcp6_request_sock),
928 .rtx_syn_ack = tcp_v6_send_synack,
929 .send_ack = tcp_v6_reqsk_send_ack,
930 .destructor = tcp_v6_reqsk_destructor,
931 .send_reset = tcp_v6_send_reset
932 };
933
934 #ifdef CONFIG_TCP_MD5SIG
935 static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
936 .md5_lookup = tcp_v6_reqsk_md5_lookup,
937 };
938 #endif
939
940 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
941 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
942 .twsk_unique = tcp_twsk_unique,
943 .twsk_destructor= tcp_twsk_destructor,
944 };
945
946 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
947 {
948 struct ipv6_pinfo *np = inet6_sk(sk);
949 struct tcphdr *th = tcp_hdr(skb);
950
951 if (skb->ip_summed == CHECKSUM_PARTIAL) {
952 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
953 skb->csum_start = skb_transport_header(skb) - skb->head;
954 skb->csum_offset = offsetof(struct tcphdr, check);
955 } else {
956 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
957 csum_partial((char *)th, th->doff<<2,
958 skb->csum));
959 }
960 }
961
962 static int tcp_v6_gso_send_check(struct sk_buff *skb)
963 {
964 struct ipv6hdr *ipv6h;
965 struct tcphdr *th;
966
967 if (!pskb_may_pull(skb, sizeof(*th)))
968 return -EINVAL;
969
970 ipv6h = ipv6_hdr(skb);
971 th = tcp_hdr(skb);
972
973 th->check = 0;
974 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
975 IPPROTO_TCP, 0);
976 skb->csum_start = skb_transport_header(skb) - skb->head;
977 skb->csum_offset = offsetof(struct tcphdr, check);
978 skb->ip_summed = CHECKSUM_PARTIAL;
979 return 0;
980 }
981
982 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
983 {
984 struct tcphdr *th = tcp_hdr(skb), *t1;
985 struct sk_buff *buff;
986 struct flowi fl;
987 int tot_len = sizeof(*th);
988 #ifdef CONFIG_TCP_MD5SIG
989 struct tcp_md5sig_key *key;
990 #endif
991
992 if (th->rst)
993 return;
994
995 if (!ipv6_unicast_destination(skb))
996 return;
997
998 #ifdef CONFIG_TCP_MD5SIG
999 if (sk)
1000 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1001 else
1002 key = NULL;
1003
1004 if (key)
1005 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1006 #endif
1007
1008 /*
1009 * We need to grab some memory, and put together an RST,
1010 * and then put it into the queue to be sent.
1011 */
1012
1013 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1014 GFP_ATOMIC);
1015 if (buff == NULL)
1016 return;
1017
1018 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1019
1020 t1 = (struct tcphdr *) skb_push(buff, tot_len);
1021
1022 /* Swap the send and the receive. */
1023 memset(t1, 0, sizeof(*t1));
1024 t1->dest = th->source;
1025 t1->source = th->dest;
1026 t1->doff = tot_len / 4;
1027 t1->rst = 1;
1028
1029 if(th->ack) {
1030 t1->seq = th->ack_seq;
1031 } else {
1032 t1->ack = 1;
1033 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
1034 + skb->len - (th->doff<<2));
1035 }
1036
1037 #ifdef CONFIG_TCP_MD5SIG
1038 if (key) {
1039 __be32 *opt = (__be32*)(t1 + 1);
1040 opt[0] = htonl((TCPOPT_NOP << 24) |
1041 (TCPOPT_NOP << 16) |
1042 (TCPOPT_MD5SIG << 8) |
1043 TCPOLEN_MD5SIG);
1044 tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
1045 &ipv6_hdr(skb)->daddr,
1046 &ipv6_hdr(skb)->saddr,
1047 t1, IPPROTO_TCP, tot_len);
1048 }
1049 #endif
1050
1051 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
1052
1053 memset(&fl, 0, sizeof(fl));
1054 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1055 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1056
1057 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1058 sizeof(*t1), IPPROTO_TCP,
1059 buff->csum);
1060
1061 fl.proto = IPPROTO_TCP;
1062 fl.oif = inet6_iif(skb);
1063 fl.fl_ip_dport = t1->dest;
1064 fl.fl_ip_sport = t1->source;
1065 security_skb_classify_flow(skb, &fl);
1066
1067 /* sk = NULL, but it is safe for now. RST socket required. */
1068 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
1069
1070 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1071 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
1072 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1073 TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
1074 return;
1075 }
1076 }
1077
1078 kfree_skb(buff);
1079 }
1080
1081 static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
1082 struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
1083 {
1084 struct tcphdr *th = tcp_hdr(skb), *t1;
1085 struct sk_buff *buff;
1086 struct flowi fl;
1087 int tot_len = sizeof(struct tcphdr);
1088 __be32 *topt;
1089 #ifdef CONFIG_TCP_MD5SIG
1090 struct tcp_md5sig_key *key;
1091 struct tcp_md5sig_key tw_key;
1092 #endif
1093
1094 #ifdef CONFIG_TCP_MD5SIG
1095 if (!tw && skb->sk) {
1096 key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr);
1097 } else if (tw && tw->tw_md5_keylen) {
1098 tw_key.key = tw->tw_md5_key;
1099 tw_key.keylen = tw->tw_md5_keylen;
1100 key = &tw_key;
1101 } else {
1102 key = NULL;
1103 }
1104 #endif
1105
1106 if (ts)
1107 tot_len += TCPOLEN_TSTAMP_ALIGNED;
1108 #ifdef CONFIG_TCP_MD5SIG
1109 if (key)
1110 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1111 #endif
1112
1113 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1114 GFP_ATOMIC);
1115 if (buff == NULL)
1116 return;
1117
1118 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1119
1120 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1121
1122 /* Swap the send and the receive. */
1123 memset(t1, 0, sizeof(*t1));
1124 t1->dest = th->source;
1125 t1->source = th->dest;
1126 t1->doff = tot_len/4;
1127 t1->seq = htonl(seq);
1128 t1->ack_seq = htonl(ack);
1129 t1->ack = 1;
1130 t1->window = htons(win);
1131
1132 topt = (__be32 *)(t1 + 1);
1133
1134 if (ts) {
1135 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1136 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1137 *topt++ = htonl(tcp_time_stamp);
1138 *topt = htonl(ts);
1139 }
1140
1141 #ifdef CONFIG_TCP_MD5SIG
1142 if (key) {
1143 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1144 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1145 tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
1146 &ipv6_hdr(skb)->daddr,
1147 &ipv6_hdr(skb)->saddr,
1148 t1, IPPROTO_TCP, tot_len);
1149 }
1150 #endif
1151
1152 buff->csum = csum_partial((char *)t1, tot_len, 0);
1153
1154 memset(&fl, 0, sizeof(fl));
1155 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1156 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1157
1158 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1159 tot_len, IPPROTO_TCP,
1160 buff->csum);
1161
1162 fl.proto = IPPROTO_TCP;
1163 fl.oif = inet6_iif(skb);
1164 fl.fl_ip_dport = t1->dest;
1165 fl.fl_ip_sport = t1->source;
1166 security_skb_classify_flow(skb, &fl);
1167
1168 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
1169 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1170 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
1171 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1172 return;
1173 }
1174 }
1175
1176 kfree_skb(buff);
1177 }
1178
1179 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1180 {
1181 struct inet_timewait_sock *tw = inet_twsk(sk);
1182 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1183
1184 tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1185 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1186 tcptw->tw_ts_recent);
1187
1188 inet_twsk_put(tw);
1189 }
1190
1191 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
1192 {
1193 tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
1194 }
1195
1196
1197 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1198 {
1199 struct request_sock *req, **prev;
1200 const struct tcphdr *th = tcp_hdr(skb);
1201 struct sock *nsk;
1202
1203 /* Find possible connection requests. */
1204 req = inet6_csk_search_req(sk, &prev, th->source,
1205 &ipv6_hdr(skb)->saddr,
1206 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1207 if (req)
1208 return tcp_check_req(sk, skb, req, prev);
1209
1210 nsk = __inet6_lookup_established(&tcp_hashinfo, &ipv6_hdr(skb)->saddr,
1211 th->source, &ipv6_hdr(skb)->daddr,
1212 ntohs(th->dest), inet6_iif(skb));
1213
1214 if (nsk) {
1215 if (nsk->sk_state != TCP_TIME_WAIT) {
1216 bh_lock_sock(nsk);
1217 return nsk;
1218 }
1219 inet_twsk_put(inet_twsk(nsk));
1220 return NULL;
1221 }
1222
1223 #if 0 /*def CONFIG_SYN_COOKIES*/
1224 if (!th->rst && !th->syn && th->ack)
1225 sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
1226 #endif
1227 return sk;
1228 }
1229
1230 /* FIXME: this is substantially similar to the ipv4 code.
1231 * Can some kind of merge be done? -- erics
1232 */
1233 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1234 {
1235 struct inet6_request_sock *treq;
1236 struct ipv6_pinfo *np = inet6_sk(sk);
1237 struct tcp_options_received tmp_opt;
1238 struct tcp_sock *tp = tcp_sk(sk);
1239 struct request_sock *req = NULL;
1240 __u32 isn = TCP_SKB_CB(skb)->when;
1241
1242 if (skb->protocol == htons(ETH_P_IP))
1243 return tcp_v4_conn_request(sk, skb);
1244
1245 if (!ipv6_unicast_destination(skb))
1246 goto drop;
1247
1248 /*
1249 * There are no SYN attacks on IPv6, yet...
1250 */
1251 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1252 if (net_ratelimit())
1253 printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
1254 goto drop;
1255 }
1256
1257 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1258 goto drop;
1259
1260 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1261 if (req == NULL)
1262 goto drop;
1263
1264 #ifdef CONFIG_TCP_MD5SIG
1265 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1266 #endif
1267
1268 tcp_clear_options(&tmp_opt);
1269 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1270 tmp_opt.user_mss = tp->rx_opt.user_mss;
1271
1272 tcp_parse_options(skb, &tmp_opt, 0);
1273
1274 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1275 tcp_openreq_init(req, &tmp_opt, skb);
1276
1277 treq = inet6_rsk(req);
1278 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1279 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1280 TCP_ECN_create_request(req, tcp_hdr(skb));
1281 treq->pktopts = NULL;
1282 if (ipv6_opt_accepted(sk, skb) ||
1283 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1284 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1285 atomic_inc(&skb->users);
1286 treq->pktopts = skb;
1287 }
1288 treq->iif = sk->sk_bound_dev_if;
1289
1290 /* So that link locals have meaning */
1291 if (!sk->sk_bound_dev_if &&
1292 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1293 treq->iif = inet6_iif(skb);
1294
1295 if (isn == 0)
1296 isn = tcp_v6_init_sequence(skb);
1297
1298 tcp_rsk(req)->snt_isn = isn;
1299
1300 security_inet_conn_request(sk, skb, req);
1301
1302 if (tcp_v6_send_synack(sk, req, NULL))
1303 goto drop;
1304
1305 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1306 return 0;
1307
1308 drop:
1309 if (req)
1310 reqsk_free(req);
1311
1312 return 0; /* don't send reset */
1313 }
1314
1315 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1316 struct request_sock *req,
1317 struct dst_entry *dst)
1318 {
1319 struct inet6_request_sock *treq = inet6_rsk(req);
1320 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1321 struct tcp6_sock *newtcp6sk;
1322 struct inet_sock *newinet;
1323 struct tcp_sock *newtp;
1324 struct sock *newsk;
1325 struct ipv6_txoptions *opt;
1326 #ifdef CONFIG_TCP_MD5SIG
1327 struct tcp_md5sig_key *key;
1328 #endif
1329
1330 if (skb->protocol == htons(ETH_P_IP)) {
1331 /*
1332 * v6 mapped
1333 */
1334
1335 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1336
1337 if (newsk == NULL)
1338 return NULL;
1339
1340 newtcp6sk = (struct tcp6_sock *)newsk;
1341 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1342
1343 newinet = inet_sk(newsk);
1344 newnp = inet6_sk(newsk);
1345 newtp = tcp_sk(newsk);
1346
1347 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1348
1349 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1350 newinet->daddr);
1351
1352 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1353 newinet->saddr);
1354
1355 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1356
1357 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1358 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1359 #ifdef CONFIG_TCP_MD5SIG
1360 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1361 #endif
1362
1363 newnp->pktoptions = NULL;
1364 newnp->opt = NULL;
1365 newnp->mcast_oif = inet6_iif(skb);
1366 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1367
1368 /*
1369 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1370 * here, tcp_create_openreq_child now does this for us, see the comment in
1371 * that function for the gory details. -acme
1372 */
1373
1374 /* It is tricky place. Until this moment IPv4 tcp
1375 worked with IPv6 icsk.icsk_af_ops.
1376 Sync it now.
1377 */
1378 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1379
1380 return newsk;
1381 }
1382
1383 opt = np->opt;
1384
1385 if (sk_acceptq_is_full(sk))
1386 goto out_overflow;
1387
1388 if (np->rxopt.bits.osrcrt == 2 &&
1389 opt == NULL && treq->pktopts) {
1390 struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts);
1391 if (rxopt->srcrt)
1392 opt = ipv6_invert_rthdr(sk,
1393 (struct ipv6_rt_hdr *)(skb_network_header(treq->pktopts) +
1394 rxopt->srcrt));
1395 }
1396
1397 if (dst == NULL) {
1398 struct in6_addr *final_p = NULL, final;
1399 struct flowi fl;
1400
1401 memset(&fl, 0, sizeof(fl));
1402 fl.proto = IPPROTO_TCP;
1403 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1404 if (opt && opt->srcrt) {
1405 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1406 ipv6_addr_copy(&final, &fl.fl6_dst);
1407 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1408 final_p = &final;
1409 }
1410 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1411 fl.oif = sk->sk_bound_dev_if;
1412 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1413 fl.fl_ip_sport = inet_sk(sk)->sport;
1414 security_req_classify_flow(req, &fl);
1415
1416 if (ip6_dst_lookup(sk, &dst, &fl))
1417 goto out;
1418
1419 if (final_p)
1420 ipv6_addr_copy(&fl.fl6_dst, final_p);
1421
1422 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1423 goto out;
1424 }
1425
1426 newsk = tcp_create_openreq_child(sk, req, skb);
1427 if (newsk == NULL)
1428 goto out;
1429
1430 /*
1431 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1432 * count here, tcp_create_openreq_child now does this for us, see the
1433 * comment in that function for the gory details. -acme
1434 */
1435
1436 newsk->sk_gso_type = SKB_GSO_TCPV6;
1437 __ip6_dst_store(newsk, dst, NULL, NULL);
1438
1439 newtcp6sk = (struct tcp6_sock *)newsk;
1440 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1441
1442 newtp = tcp_sk(newsk);
1443 newinet = inet_sk(newsk);
1444 newnp = inet6_sk(newsk);
1445
1446 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1447
1448 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1449 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1450 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1451 newsk->sk_bound_dev_if = treq->iif;
1452
1453 /* Now IPv6 options...
1454
1455 First: no IPv4 options.
1456 */
1457 newinet->opt = NULL;
1458 newnp->ipv6_fl_list = NULL;
1459
1460 /* Clone RX bits */
1461 newnp->rxopt.all = np->rxopt.all;
1462
1463 /* Clone pktoptions received with SYN */
1464 newnp->pktoptions = NULL;
1465 if (treq->pktopts != NULL) {
1466 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1467 kfree_skb(treq->pktopts);
1468 treq->pktopts = NULL;
1469 if (newnp->pktoptions)
1470 skb_set_owner_r(newnp->pktoptions, newsk);
1471 }
1472 newnp->opt = NULL;
1473 newnp->mcast_oif = inet6_iif(skb);
1474 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1475
1476 /* Clone native IPv6 options from listening socket (if any)
1477
1478 Yes, keeping reference count would be much more clever,
1479 but we make one more one thing there: reattach optmem
1480 to newsk.
1481 */
1482 if (opt) {
1483 newnp->opt = ipv6_dup_options(newsk, opt);
1484 if (opt != np->opt)
1485 sock_kfree_s(sk, opt, opt->tot_len);
1486 }
1487
1488 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1489 if (newnp->opt)
1490 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1491 newnp->opt->opt_flen);
1492
1493 tcp_mtup_init(newsk);
1494 tcp_sync_mss(newsk, dst_mtu(dst));
1495 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1496 tcp_initialize_rcv_mss(newsk);
1497
1498 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1499
1500 #ifdef CONFIG_TCP_MD5SIG
1501 /* Copy over the MD5 key from the original socket */
1502 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1503 /* We're using one, so create a matching key
1504 * on the newsk structure. If we fail to get
1505 * memory, then we end up not copying the key
1506 * across. Shucks.
1507 */
1508 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1509 if (newkey != NULL)
1510 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1511 newkey, key->keylen);
1512 }
1513 #endif
1514
1515 __inet6_hash(&tcp_hashinfo, newsk);
1516 inet_inherit_port(&tcp_hashinfo, sk, newsk);
1517
1518 return newsk;
1519
1520 out_overflow:
1521 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
1522 out:
1523 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
1524 if (opt && opt != np->opt)
1525 sock_kfree_s(sk, opt, opt->tot_len);
1526 dst_release(dst);
1527 return NULL;
1528 }
1529
1530 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1531 {
1532 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1533 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1534 &ipv6_hdr(skb)->daddr, skb->csum)) {
1535 skb->ip_summed = CHECKSUM_UNNECESSARY;
1536 return 0;
1537 }
1538 }
1539
1540 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1541 &ipv6_hdr(skb)->saddr,
1542 &ipv6_hdr(skb)->daddr, 0));
1543
1544 if (skb->len <= 76) {
1545 return __skb_checksum_complete(skb);
1546 }
1547 return 0;
1548 }
1549
1550 /* The socket must have it's spinlock held when we get
1551 * here.
1552 *
1553 * We have a potential double-lock case here, so even when
1554 * doing backlog processing we use the BH locking scheme.
1555 * This is because we cannot sleep with the original spinlock
1556 * held.
1557 */
1558 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1559 {
1560 struct ipv6_pinfo *np = inet6_sk(sk);
1561 struct tcp_sock *tp;
1562 struct sk_buff *opt_skb = NULL;
1563
1564 /* Imagine: socket is IPv6. IPv4 packet arrives,
1565 goes to IPv4 receive handler and backlogged.
1566 From backlog it always goes here. Kerboom...
1567 Fortunately, tcp_rcv_established and rcv_established
1568 handle them correctly, but it is not case with
1569 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1570 */
1571
1572 if (skb->protocol == htons(ETH_P_IP))
1573 return tcp_v4_do_rcv(sk, skb);
1574
1575 #ifdef CONFIG_TCP_MD5SIG
1576 if (tcp_v6_inbound_md5_hash (sk, skb))
1577 goto discard;
1578 #endif
1579
1580 if (sk_filter(sk, skb))
1581 goto discard;
1582
1583 /*
1584 * socket locking is here for SMP purposes as backlog rcv
1585 * is currently called with bh processing disabled.
1586 */
1587
1588 /* Do Stevens' IPV6_PKTOPTIONS.
1589
1590 Yes, guys, it is the only place in our code, where we
1591 may make it not affecting IPv4.
1592 The rest of code is protocol independent,
1593 and I do not like idea to uglify IPv4.
1594
1595 Actually, all the idea behind IPV6_PKTOPTIONS
1596 looks not very well thought. For now we latch
1597 options, received in the last packet, enqueued
1598 by tcp. Feel free to propose better solution.
1599 --ANK (980728)
1600 */
1601 if (np->rxopt.all)
1602 opt_skb = skb_clone(skb, GFP_ATOMIC);
1603
1604 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1605 TCP_CHECK_TIMER(sk);
1606 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1607 goto reset;
1608 TCP_CHECK_TIMER(sk);
1609 if (opt_skb)
1610 goto ipv6_pktoptions;
1611 return 0;
1612 }
1613
1614 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1615 goto csum_err;
1616
1617 if (sk->sk_state == TCP_LISTEN) {
1618 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1619 if (!nsk)
1620 goto discard;
1621
1622 /*
1623 * Queue it on the new socket if the new socket is active,
1624 * otherwise we just shortcircuit this and continue with
1625 * the new socket..
1626 */
1627 if(nsk != sk) {
1628 if (tcp_child_process(sk, nsk, skb))
1629 goto reset;
1630 if (opt_skb)
1631 __kfree_skb(opt_skb);
1632 return 0;
1633 }
1634 }
1635
1636 TCP_CHECK_TIMER(sk);
1637 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1638 goto reset;
1639 TCP_CHECK_TIMER(sk);
1640 if (opt_skb)
1641 goto ipv6_pktoptions;
1642 return 0;
1643
1644 reset:
1645 tcp_v6_send_reset(sk, skb);
1646 discard:
1647 if (opt_skb)
1648 __kfree_skb(opt_skb);
1649 kfree_skb(skb);
1650 return 0;
1651 csum_err:
1652 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1653 goto discard;
1654
1655
1656 ipv6_pktoptions:
1657 /* Do you ask, what is it?
1658
1659 1. skb was enqueued by tcp.
1660 2. skb is added to tail of read queue, rather than out of order.
1661 3. socket is not in passive state.
1662 4. Finally, it really contains options, which user wants to receive.
1663 */
1664 tp = tcp_sk(sk);
1665 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1666 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1667 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1668 np->mcast_oif = inet6_iif(opt_skb);
1669 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1670 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1671 if (ipv6_opt_accepted(sk, opt_skb)) {
1672 skb_set_owner_r(opt_skb, sk);
1673 opt_skb = xchg(&np->pktoptions, opt_skb);
1674 } else {
1675 __kfree_skb(opt_skb);
1676 opt_skb = xchg(&np->pktoptions, NULL);
1677 }
1678 }
1679
1680 if (opt_skb)
1681 kfree_skb(opt_skb);
1682 return 0;
1683 }
1684
1685 static int tcp_v6_rcv(struct sk_buff **pskb)
1686 {
1687 struct sk_buff *skb = *pskb;
1688 struct tcphdr *th;
1689 struct sock *sk;
1690 int ret;
1691
1692 if (skb->pkt_type != PACKET_HOST)
1693 goto discard_it;
1694
1695 /*
1696 * Count it even if it's bad.
1697 */
1698 TCP_INC_STATS_BH(TCP_MIB_INSEGS);
1699
1700 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1701 goto discard_it;
1702
1703 th = tcp_hdr(skb);
1704
1705 if (th->doff < sizeof(struct tcphdr)/4)
1706 goto bad_packet;
1707 if (!pskb_may_pull(skb, th->doff*4))
1708 goto discard_it;
1709
1710 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1711 goto bad_packet;
1712
1713 th = tcp_hdr(skb);
1714 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1715 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1716 skb->len - th->doff*4);
1717 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1718 TCP_SKB_CB(skb)->when = 0;
1719 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1720 TCP_SKB_CB(skb)->sacked = 0;
1721
1722 sk = __inet6_lookup(&tcp_hashinfo, &ipv6_hdr(skb)->saddr, th->source,
1723 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1724 inet6_iif(skb));
1725
1726 if (!sk)
1727 goto no_tcp_socket;
1728
1729 process:
1730 if (sk->sk_state == TCP_TIME_WAIT)
1731 goto do_time_wait;
1732
1733 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1734 goto discard_and_relse;
1735
1736 if (sk_filter(sk, skb))
1737 goto discard_and_relse;
1738
1739 skb->dev = NULL;
1740
1741 bh_lock_sock_nested(sk);
1742 ret = 0;
1743 if (!sock_owned_by_user(sk)) {
1744 #ifdef CONFIG_NET_DMA
1745 struct tcp_sock *tp = tcp_sk(sk);
1746 if (tp->ucopy.dma_chan)
1747 ret = tcp_v6_do_rcv(sk, skb);
1748 else
1749 #endif
1750 {
1751 if (!tcp_prequeue(sk, skb))
1752 ret = tcp_v6_do_rcv(sk, skb);
1753 }
1754 } else
1755 sk_add_backlog(sk, skb);
1756 bh_unlock_sock(sk);
1757
1758 sock_put(sk);
1759 return ret ? -1 : 0;
1760
1761 no_tcp_socket:
1762 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1763 goto discard_it;
1764
1765 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1766 bad_packet:
1767 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1768 } else {
1769 tcp_v6_send_reset(NULL, skb);
1770 }
1771
1772 discard_it:
1773
1774 /*
1775 * Discard frame
1776 */
1777
1778 kfree_skb(skb);
1779 return 0;
1780
1781 discard_and_relse:
1782 sock_put(sk);
1783 goto discard_it;
1784
1785 do_time_wait:
1786 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1787 inet_twsk_put(inet_twsk(sk));
1788 goto discard_it;
1789 }
1790
1791 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1792 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1793 inet_twsk_put(inet_twsk(sk));
1794 goto discard_it;
1795 }
1796
1797 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1798 case TCP_TW_SYN:
1799 {
1800 struct sock *sk2;
1801
1802 sk2 = inet6_lookup_listener(&tcp_hashinfo,
1803 &ipv6_hdr(skb)->daddr,
1804 ntohs(th->dest), inet6_iif(skb));
1805 if (sk2 != NULL) {
1806 struct inet_timewait_sock *tw = inet_twsk(sk);
1807 inet_twsk_deschedule(tw, &tcp_death_row);
1808 inet_twsk_put(tw);
1809 sk = sk2;
1810 goto process;
1811 }
1812 /* Fall through to ACK */
1813 }
1814 case TCP_TW_ACK:
1815 tcp_v6_timewait_ack(sk, skb);
1816 break;
1817 case TCP_TW_RST:
1818 goto no_tcp_socket;
1819 case TCP_TW_SUCCESS:;
1820 }
1821 goto discard_it;
1822 }
1823
1824 static int tcp_v6_remember_stamp(struct sock *sk)
1825 {
1826 /* Alas, not yet... */
1827 return 0;
1828 }
1829
1830 static struct inet_connection_sock_af_ops ipv6_specific = {
1831 .queue_xmit = inet6_csk_xmit,
1832 .send_check = tcp_v6_send_check,
1833 .rebuild_header = inet6_sk_rebuild_header,
1834 .conn_request = tcp_v6_conn_request,
1835 .syn_recv_sock = tcp_v6_syn_recv_sock,
1836 .remember_stamp = tcp_v6_remember_stamp,
1837 .net_header_len = sizeof(struct ipv6hdr),
1838 .setsockopt = ipv6_setsockopt,
1839 .getsockopt = ipv6_getsockopt,
1840 .addr2sockaddr = inet6_csk_addr2sockaddr,
1841 .sockaddr_len = sizeof(struct sockaddr_in6),
1842 #ifdef CONFIG_COMPAT
1843 .compat_setsockopt = compat_ipv6_setsockopt,
1844 .compat_getsockopt = compat_ipv6_getsockopt,
1845 #endif
1846 };
1847
1848 #ifdef CONFIG_TCP_MD5SIG
1849 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1850 .md5_lookup = tcp_v6_md5_lookup,
1851 .calc_md5_hash = tcp_v6_calc_md5_hash,
1852 .md5_add = tcp_v6_md5_add_func,
1853 .md5_parse = tcp_v6_parse_md5_keys,
1854 };
1855 #endif
1856
1857 /*
1858 * TCP over IPv4 via INET6 API
1859 */
1860
1861 static struct inet_connection_sock_af_ops ipv6_mapped = {
1862 .queue_xmit = ip_queue_xmit,
1863 .send_check = tcp_v4_send_check,
1864 .rebuild_header = inet_sk_rebuild_header,
1865 .conn_request = tcp_v6_conn_request,
1866 .syn_recv_sock = tcp_v6_syn_recv_sock,
1867 .remember_stamp = tcp_v4_remember_stamp,
1868 .net_header_len = sizeof(struct iphdr),
1869 .setsockopt = ipv6_setsockopt,
1870 .getsockopt = ipv6_getsockopt,
1871 .addr2sockaddr = inet6_csk_addr2sockaddr,
1872 .sockaddr_len = sizeof(struct sockaddr_in6),
1873 #ifdef CONFIG_COMPAT
1874 .compat_setsockopt = compat_ipv6_setsockopt,
1875 .compat_getsockopt = compat_ipv6_getsockopt,
1876 #endif
1877 };
1878
1879 #ifdef CONFIG_TCP_MD5SIG
1880 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1881 .md5_lookup = tcp_v4_md5_lookup,
1882 .calc_md5_hash = tcp_v4_calc_md5_hash,
1883 .md5_add = tcp_v6_md5_add_func,
1884 .md5_parse = tcp_v6_parse_md5_keys,
1885 };
1886 #endif
1887
1888 /* NOTE: A lot of things set to zero explicitly by call to
1889 * sk_alloc() so need not be done here.
1890 */
1891 static int tcp_v6_init_sock(struct sock *sk)
1892 {
1893 struct inet_connection_sock *icsk = inet_csk(sk);
1894 struct tcp_sock *tp = tcp_sk(sk);
1895
1896 skb_queue_head_init(&tp->out_of_order_queue);
1897 tcp_init_xmit_timers(sk);
1898 tcp_prequeue_init(tp);
1899
1900 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1901 tp->mdev = TCP_TIMEOUT_INIT;
1902
1903 /* So many TCP implementations out there (incorrectly) count the
1904 * initial SYN frame in their delayed-ACK and congestion control
1905 * algorithms that we must have the following bandaid to talk
1906 * efficiently to them. -DaveM
1907 */
1908 tp->snd_cwnd = 2;
1909
1910 /* See draft-stevens-tcpca-spec-01 for discussion of the
1911 * initialization of these values.
1912 */
1913 tp->snd_ssthresh = 0x7fffffff;
1914 tp->snd_cwnd_clamp = ~0;
1915 tp->mss_cache = 536;
1916
1917 tp->reordering = sysctl_tcp_reordering;
1918
1919 sk->sk_state = TCP_CLOSE;
1920
1921 icsk->icsk_af_ops = &ipv6_specific;
1922 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1923 icsk->icsk_sync_mss = tcp_sync_mss;
1924 sk->sk_write_space = sk_stream_write_space;
1925 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1926
1927 #ifdef CONFIG_TCP_MD5SIG
1928 tp->af_specific = &tcp_sock_ipv6_specific;
1929 #endif
1930
1931 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1932 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1933
1934 atomic_inc(&tcp_sockets_allocated);
1935
1936 return 0;
1937 }
1938
1939 static int tcp_v6_destroy_sock(struct sock *sk)
1940 {
1941 #ifdef CONFIG_TCP_MD5SIG
1942 /* Clean up the MD5 key list */
1943 if (tcp_sk(sk)->md5sig_info)
1944 tcp_v6_clear_md5_list(sk);
1945 #endif
1946 tcp_v4_destroy_sock(sk);
1947 return inet6_destroy_sock(sk);
1948 }
1949
1950 #ifdef CONFIG_PROC_FS
1951 /* Proc filesystem TCPv6 sock list dumping. */
1952 static void get_openreq6(struct seq_file *seq,
1953 struct sock *sk, struct request_sock *req, int i, int uid)
1954 {
1955 int ttd = req->expires - jiffies;
1956 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1957 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1958
1959 if (ttd < 0)
1960 ttd = 0;
1961
1962 seq_printf(seq,
1963 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1964 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1965 i,
1966 src->s6_addr32[0], src->s6_addr32[1],
1967 src->s6_addr32[2], src->s6_addr32[3],
1968 ntohs(inet_sk(sk)->sport),
1969 dest->s6_addr32[0], dest->s6_addr32[1],
1970 dest->s6_addr32[2], dest->s6_addr32[3],
1971 ntohs(inet_rsk(req)->rmt_port),
1972 TCP_SYN_RECV,
1973 0,0, /* could print option size, but that is af dependent. */
1974 1, /* timers active (only the expire timer) */
1975 jiffies_to_clock_t(ttd),
1976 req->retrans,
1977 uid,
1978 0, /* non standard timer */
1979 0, /* open_requests have no inode */
1980 0, req);
1981 }
1982
1983 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1984 {
1985 struct in6_addr *dest, *src;
1986 __u16 destp, srcp;
1987 int timer_active;
1988 unsigned long timer_expires;
1989 struct inet_sock *inet = inet_sk(sp);
1990 struct tcp_sock *tp = tcp_sk(sp);
1991 const struct inet_connection_sock *icsk = inet_csk(sp);
1992 struct ipv6_pinfo *np = inet6_sk(sp);
1993
1994 dest = &np->daddr;
1995 src = &np->rcv_saddr;
1996 destp = ntohs(inet->dport);
1997 srcp = ntohs(inet->sport);
1998
1999 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
2000 timer_active = 1;
2001 timer_expires = icsk->icsk_timeout;
2002 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
2003 timer_active = 4;
2004 timer_expires = icsk->icsk_timeout;
2005 } else if (timer_pending(&sp->sk_timer)) {
2006 timer_active = 2;
2007 timer_expires = sp->sk_timer.expires;
2008 } else {
2009 timer_active = 0;
2010 timer_expires = jiffies;
2011 }
2012
2013 seq_printf(seq,
2014 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2015 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
2016 i,
2017 src->s6_addr32[0], src->s6_addr32[1],
2018 src->s6_addr32[2], src->s6_addr32[3], srcp,
2019 dest->s6_addr32[0], dest->s6_addr32[1],
2020 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2021 sp->sk_state,
2022 tp->write_seq-tp->snd_una,
2023 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
2024 timer_active,
2025 jiffies_to_clock_t(timer_expires - jiffies),
2026 icsk->icsk_retransmits,
2027 sock_i_uid(sp),
2028 icsk->icsk_probes_out,
2029 sock_i_ino(sp),
2030 atomic_read(&sp->sk_refcnt), sp,
2031 icsk->icsk_rto,
2032 icsk->icsk_ack.ato,
2033 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
2034 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
2035 );
2036 }
2037
2038 static void get_timewait6_sock(struct seq_file *seq,
2039 struct inet_timewait_sock *tw, int i)
2040 {
2041 struct in6_addr *dest, *src;
2042 __u16 destp, srcp;
2043 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
2044 int ttd = tw->tw_ttd - jiffies;
2045
2046 if (ttd < 0)
2047 ttd = 0;
2048
2049 dest = &tw6->tw_v6_daddr;
2050 src = &tw6->tw_v6_rcv_saddr;
2051 destp = ntohs(tw->tw_dport);
2052 srcp = ntohs(tw->tw_sport);
2053
2054 seq_printf(seq,
2055 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2056 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
2057 i,
2058 src->s6_addr32[0], src->s6_addr32[1],
2059 src->s6_addr32[2], src->s6_addr32[3], srcp,
2060 dest->s6_addr32[0], dest->s6_addr32[1],
2061 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2062 tw->tw_substate, 0, 0,
2063 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2064 atomic_read(&tw->tw_refcnt), tw);
2065 }
2066
2067 static int tcp6_seq_show(struct seq_file *seq, void *v)
2068 {
2069 struct tcp_iter_state *st;
2070
2071 if (v == SEQ_START_TOKEN) {
2072 seq_puts(seq,
2073 " sl "
2074 "local_address "
2075 "remote_address "
2076 "st tx_queue rx_queue tr tm->when retrnsmt"
2077 " uid timeout inode\n");
2078 goto out;
2079 }
2080 st = seq->private;
2081
2082 switch (st->state) {
2083 case TCP_SEQ_STATE_LISTENING:
2084 case TCP_SEQ_STATE_ESTABLISHED:
2085 get_tcp6_sock(seq, v, st->num);
2086 break;
2087 case TCP_SEQ_STATE_OPENREQ:
2088 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2089 break;
2090 case TCP_SEQ_STATE_TIME_WAIT:
2091 get_timewait6_sock(seq, v, st->num);
2092 break;
2093 }
2094 out:
2095 return 0;
2096 }
2097
2098 static struct file_operations tcp6_seq_fops;
2099 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2100 .owner = THIS_MODULE,
2101 .name = "tcp6",
2102 .family = AF_INET6,
2103 .seq_show = tcp6_seq_show,
2104 .seq_fops = &tcp6_seq_fops,
2105 };
2106
2107 int __init tcp6_proc_init(void)
2108 {
2109 return tcp_proc_register(&tcp6_seq_afinfo);
2110 }
2111
2112 void tcp6_proc_exit(void)
2113 {
2114 tcp_proc_unregister(&tcp6_seq_afinfo);
2115 }
2116 #endif
2117
2118 struct proto tcpv6_prot = {
2119 .name = "TCPv6",
2120 .owner = THIS_MODULE,
2121 .close = tcp_close,
2122 .connect = tcp_v6_connect,
2123 .disconnect = tcp_disconnect,
2124 .accept = inet_csk_accept,
2125 .ioctl = tcp_ioctl,
2126 .init = tcp_v6_init_sock,
2127 .destroy = tcp_v6_destroy_sock,
2128 .shutdown = tcp_shutdown,
2129 .setsockopt = tcp_setsockopt,
2130 .getsockopt = tcp_getsockopt,
2131 .sendmsg = tcp_sendmsg,
2132 .recvmsg = tcp_recvmsg,
2133 .backlog_rcv = tcp_v6_do_rcv,
2134 .hash = tcp_v6_hash,
2135 .unhash = tcp_unhash,
2136 .get_port = tcp_v6_get_port,
2137 .enter_memory_pressure = tcp_enter_memory_pressure,
2138 .sockets_allocated = &tcp_sockets_allocated,
2139 .memory_allocated = &tcp_memory_allocated,
2140 .memory_pressure = &tcp_memory_pressure,
2141 .orphan_count = &tcp_orphan_count,
2142 .sysctl_mem = sysctl_tcp_mem,
2143 .sysctl_wmem = sysctl_tcp_wmem,
2144 .sysctl_rmem = sysctl_tcp_rmem,
2145 .max_header = MAX_TCP_HEADER,
2146 .obj_size = sizeof(struct tcp6_sock),
2147 .twsk_prot = &tcp6_timewait_sock_ops,
2148 .rsk_prot = &tcp6_request_sock_ops,
2149 #ifdef CONFIG_COMPAT
2150 .compat_setsockopt = compat_tcp_setsockopt,
2151 .compat_getsockopt = compat_tcp_getsockopt,
2152 #endif
2153 };
2154
2155 static struct inet6_protocol tcpv6_protocol = {
2156 .handler = tcp_v6_rcv,
2157 .err_handler = tcp_v6_err,
2158 .gso_send_check = tcp_v6_gso_send_check,
2159 .gso_segment = tcp_tso_segment,
2160 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2161 };
2162
2163 static struct inet_protosw tcpv6_protosw = {
2164 .type = SOCK_STREAM,
2165 .protocol = IPPROTO_TCP,
2166 .prot = &tcpv6_prot,
2167 .ops = &inet6_stream_ops,
2168 .capability = -1,
2169 .no_check = 0,
2170 .flags = INET_PROTOSW_PERMANENT |
2171 INET_PROTOSW_ICSK,
2172 };
2173
2174 void __init tcpv6_init(void)
2175 {
2176 /* register inet6 protocol */
2177 if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0)
2178 printk(KERN_ERR "tcpv6_init: Could not register protocol\n");
2179 inet6_register_protosw(&tcpv6_protosw);
2180
2181 if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW,
2182 IPPROTO_TCP) < 0)
2183 panic("Failed to create the TCPv6 control socket.\n");
2184 }
Linux kernel - Deliverables
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