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tcpv[46]: fix md5 pseudoheader address field ordering
[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 * 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/module.h>
27 #include <linux/errno.h>
28 #include <linux/types.h>
29 #include <linux/socket.h>
30 #include <linux/sockios.h>
31 #include <linux/net.h>
32 #include <linux/jiffies.h>
33 #include <linux/in.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/init.h>
37 #include <linux/jhash.h>
38 #include <linux/ipsec.h>
39 #include <linux/times.h>
40
41 #include <linux/ipv6.h>
42 #include <linux/icmpv6.h>
43 #include <linux/random.h>
44
45 #include <net/tcp.h>
46 #include <net/ndisc.h>
47 #include <net/inet6_hashtables.h>
48 #include <net/inet6_connection_sock.h>
49 #include <net/ipv6.h>
50 #include <net/transp_v6.h>
51 #include <net/addrconf.h>
52 #include <net/ip6_route.h>
53 #include <net/ip6_checksum.h>
54 #include <net/inet_ecn.h>
55 #include <net/protocol.h>
56 #include <net/xfrm.h>
57 #include <net/snmp.h>
58 #include <net/dsfield.h>
59 #include <net/timewait_sock.h>
60 #include <net/netdma.h>
61 #include <net/inet_common.h>
62
63 #include <asm/uaccess.h>
64
65 #include <linux/proc_fs.h>
66 #include <linux/seq_file.h>
67
68 #include <linux/crypto.h>
69 #include <linux/scatterlist.h>
70
71 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
72 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
73 struct request_sock *req);
74
75 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
76
77 static struct inet_connection_sock_af_ops ipv6_mapped;
78 static struct inet_connection_sock_af_ops ipv6_specific;
79 #ifdef CONFIG_TCP_MD5SIG
80 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
81 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
82 #else
83 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
84 struct in6_addr *addr)
85 {
86 return NULL;
87 }
88 #endif
89
90 static void tcp_v6_hash(struct sock *sk)
91 {
92 if (sk->sk_state != TCP_CLOSE) {
93 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
94 tcp_prot.hash(sk);
95 return;
96 }
97 local_bh_disable();
98 __inet6_hash(sk);
99 local_bh_enable();
100 }
101 }
102
103 static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
104 struct in6_addr *saddr,
105 struct in6_addr *daddr,
106 __wsum base)
107 {
108 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
109 }
110
111 static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
112 {
113 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
114 ipv6_hdr(skb)->saddr.s6_addr32,
115 tcp_hdr(skb)->dest,
116 tcp_hdr(skb)->source);
117 }
118
119 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
120 int addr_len)
121 {
122 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
123 struct inet_sock *inet = inet_sk(sk);
124 struct inet_connection_sock *icsk = inet_csk(sk);
125 struct ipv6_pinfo *np = inet6_sk(sk);
126 struct tcp_sock *tp = tcp_sk(sk);
127 struct in6_addr *saddr = NULL, *final_p = NULL, final;
128 struct flowi fl;
129 struct dst_entry *dst;
130 int addr_type;
131 int err;
132
133 if (addr_len < SIN6_LEN_RFC2133)
134 return -EINVAL;
135
136 if (usin->sin6_family != AF_INET6)
137 return(-EAFNOSUPPORT);
138
139 memset(&fl, 0, sizeof(fl));
140
141 if (np->sndflow) {
142 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
143 IP6_ECN_flow_init(fl.fl6_flowlabel);
144 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
145 struct ip6_flowlabel *flowlabel;
146 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
147 if (flowlabel == NULL)
148 return -EINVAL;
149 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
150 fl6_sock_release(flowlabel);
151 }
152 }
153
154 /*
155 * connect() to INADDR_ANY means loopback (BSD'ism).
156 */
157
158 if(ipv6_addr_any(&usin->sin6_addr))
159 usin->sin6_addr.s6_addr[15] = 0x1;
160
161 addr_type = ipv6_addr_type(&usin->sin6_addr);
162
163 if(addr_type & IPV6_ADDR_MULTICAST)
164 return -ENETUNREACH;
165
166 if (addr_type&IPV6_ADDR_LINKLOCAL) {
167 if (addr_len >= sizeof(struct sockaddr_in6) &&
168 usin->sin6_scope_id) {
169 /* If interface is set while binding, indices
170 * must coincide.
171 */
172 if (sk->sk_bound_dev_if &&
173 sk->sk_bound_dev_if != usin->sin6_scope_id)
174 return -EINVAL;
175
176 sk->sk_bound_dev_if = usin->sin6_scope_id;
177 }
178
179 /* Connect to link-local address requires an interface */
180 if (!sk->sk_bound_dev_if)
181 return -EINVAL;
182 }
183
184 if (tp->rx_opt.ts_recent_stamp &&
185 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
186 tp->rx_opt.ts_recent = 0;
187 tp->rx_opt.ts_recent_stamp = 0;
188 tp->write_seq = 0;
189 }
190
191 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
192 np->flow_label = fl.fl6_flowlabel;
193
194 /*
195 * TCP over IPv4
196 */
197
198 if (addr_type == IPV6_ADDR_MAPPED) {
199 u32 exthdrlen = icsk->icsk_ext_hdr_len;
200 struct sockaddr_in sin;
201
202 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
203
204 if (__ipv6_only_sock(sk))
205 return -ENETUNREACH;
206
207 sin.sin_family = AF_INET;
208 sin.sin_port = usin->sin6_port;
209 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
210
211 icsk->icsk_af_ops = &ipv6_mapped;
212 sk->sk_backlog_rcv = tcp_v4_do_rcv;
213 #ifdef CONFIG_TCP_MD5SIG
214 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
215 #endif
216
217 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
218
219 if (err) {
220 icsk->icsk_ext_hdr_len = exthdrlen;
221 icsk->icsk_af_ops = &ipv6_specific;
222 sk->sk_backlog_rcv = tcp_v6_do_rcv;
223 #ifdef CONFIG_TCP_MD5SIG
224 tp->af_specific = &tcp_sock_ipv6_specific;
225 #endif
226 goto failure;
227 } else {
228 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
229 inet->saddr);
230 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
231 inet->rcv_saddr);
232 }
233
234 return err;
235 }
236
237 if (!ipv6_addr_any(&np->rcv_saddr))
238 saddr = &np->rcv_saddr;
239
240 fl.proto = IPPROTO_TCP;
241 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
242 ipv6_addr_copy(&fl.fl6_src,
243 (saddr ? saddr : &np->saddr));
244 fl.oif = sk->sk_bound_dev_if;
245 fl.fl_ip_dport = usin->sin6_port;
246 fl.fl_ip_sport = inet->sport;
247
248 if (np->opt && np->opt->srcrt) {
249 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
250 ipv6_addr_copy(&final, &fl.fl6_dst);
251 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
252 final_p = &final;
253 }
254
255 security_sk_classify_flow(sk, &fl);
256
257 err = ip6_dst_lookup(sk, &dst, &fl);
258 if (err)
259 goto failure;
260 if (final_p)
261 ipv6_addr_copy(&fl.fl6_dst, final_p);
262
263 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
264 if (err == -EREMOTE)
265 err = ip6_dst_blackhole(sk, &dst, &fl);
266 if (err < 0)
267 goto failure;
268 }
269
270 if (saddr == NULL) {
271 saddr = &fl.fl6_src;
272 ipv6_addr_copy(&np->rcv_saddr, saddr);
273 }
274
275 /* set the source address */
276 ipv6_addr_copy(&np->saddr, saddr);
277 inet->rcv_saddr = LOOPBACK4_IPV6;
278
279 sk->sk_gso_type = SKB_GSO_TCPV6;
280 __ip6_dst_store(sk, dst, NULL, NULL);
281
282 icsk->icsk_ext_hdr_len = 0;
283 if (np->opt)
284 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
285 np->opt->opt_nflen);
286
287 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
288
289 inet->dport = usin->sin6_port;
290
291 tcp_set_state(sk, TCP_SYN_SENT);
292 err = inet6_hash_connect(&tcp_death_row, sk);
293 if (err)
294 goto late_failure;
295
296 if (!tp->write_seq)
297 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
298 np->daddr.s6_addr32,
299 inet->sport,
300 inet->dport);
301
302 err = tcp_connect(sk);
303 if (err)
304 goto late_failure;
305
306 return 0;
307
308 late_failure:
309 tcp_set_state(sk, TCP_CLOSE);
310 __sk_dst_reset(sk);
311 failure:
312 inet->dport = 0;
313 sk->sk_route_caps = 0;
314 return err;
315 }
316
317 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
318 int type, int code, int offset, __be32 info)
319 {
320 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
321 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
322 struct ipv6_pinfo *np;
323 struct sock *sk;
324 int err;
325 struct tcp_sock *tp;
326 __u32 seq;
327 struct net *net = dev_net(skb->dev);
328
329 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
330 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
331
332 if (sk == NULL) {
333 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
334 ICMP6_MIB_INERRORS);
335 return;
336 }
337
338 if (sk->sk_state == TCP_TIME_WAIT) {
339 inet_twsk_put(inet_twsk(sk));
340 return;
341 }
342
343 bh_lock_sock(sk);
344 if (sock_owned_by_user(sk))
345 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
346
347 if (sk->sk_state == TCP_CLOSE)
348 goto out;
349
350 tp = tcp_sk(sk);
351 seq = ntohl(th->seq);
352 if (sk->sk_state != TCP_LISTEN &&
353 !between(seq, tp->snd_una, tp->snd_nxt)) {
354 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
355 goto out;
356 }
357
358 np = inet6_sk(sk);
359
360 if (type == ICMPV6_PKT_TOOBIG) {
361 struct dst_entry *dst = NULL;
362
363 if (sock_owned_by_user(sk))
364 goto out;
365 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
366 goto out;
367
368 /* icmp should have updated the destination cache entry */
369 dst = __sk_dst_check(sk, np->dst_cookie);
370
371 if (dst == NULL) {
372 struct inet_sock *inet = inet_sk(sk);
373 struct flowi fl;
374
375 /* BUGGG_FUTURE: Again, it is not clear how
376 to handle rthdr case. Ignore this complexity
377 for now.
378 */
379 memset(&fl, 0, sizeof(fl));
380 fl.proto = IPPROTO_TCP;
381 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
382 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
383 fl.oif = sk->sk_bound_dev_if;
384 fl.fl_ip_dport = inet->dport;
385 fl.fl_ip_sport = inet->sport;
386 security_skb_classify_flow(skb, &fl);
387
388 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
389 sk->sk_err_soft = -err;
390 goto out;
391 }
392
393 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
394 sk->sk_err_soft = -err;
395 goto out;
396 }
397
398 } else
399 dst_hold(dst);
400
401 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
402 tcp_sync_mss(sk, dst_mtu(dst));
403 tcp_simple_retransmit(sk);
404 } /* else let the usual retransmit timer handle it */
405 dst_release(dst);
406 goto out;
407 }
408
409 icmpv6_err_convert(type, code, &err);
410
411 /* Might be for an request_sock */
412 switch (sk->sk_state) {
413 struct request_sock *req, **prev;
414 case TCP_LISTEN:
415 if (sock_owned_by_user(sk))
416 goto out;
417
418 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
419 &hdr->saddr, inet6_iif(skb));
420 if (!req)
421 goto out;
422
423 /* ICMPs are not backlogged, hence we cannot get
424 * an established socket here.
425 */
426 WARN_ON(req->sk != NULL);
427
428 if (seq != tcp_rsk(req)->snt_isn) {
429 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
430 goto out;
431 }
432
433 inet_csk_reqsk_queue_drop(sk, req, prev);
434 goto out;
435
436 case TCP_SYN_SENT:
437 case TCP_SYN_RECV: /* Cannot happen.
438 It can, it SYNs are crossed. --ANK */
439 if (!sock_owned_by_user(sk)) {
440 sk->sk_err = err;
441 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
442
443 tcp_done(sk);
444 } else
445 sk->sk_err_soft = err;
446 goto out;
447 }
448
449 if (!sock_owned_by_user(sk) && np->recverr) {
450 sk->sk_err = err;
451 sk->sk_error_report(sk);
452 } else
453 sk->sk_err_soft = err;
454
455 out:
456 bh_unlock_sock(sk);
457 sock_put(sk);
458 }
459
460
461 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
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 struct dst_entry *dst;
470 int err = -1;
471
472 memset(&fl, 0, sizeof(fl));
473 fl.proto = IPPROTO_TCP;
474 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
475 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
476 fl.fl6_flowlabel = 0;
477 fl.oif = treq->iif;
478 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
479 fl.fl_ip_sport = inet_sk(sk)->sport;
480 security_req_classify_flow(req, &fl);
481
482 opt = np->opt;
483 if (opt && opt->srcrt) {
484 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
485 ipv6_addr_copy(&final, &fl.fl6_dst);
486 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
487 final_p = &final;
488 }
489
490 err = ip6_dst_lookup(sk, &dst, &fl);
491 if (err)
492 goto done;
493 if (final_p)
494 ipv6_addr_copy(&fl.fl6_dst, final_p);
495 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
496 goto done;
497
498 skb = tcp_make_synack(sk, dst, req);
499 if (skb) {
500 struct tcphdr *th = tcp_hdr(skb);
501
502 th->check = tcp_v6_check(th, skb->len,
503 &treq->loc_addr, &treq->rmt_addr,
504 csum_partial((char *)th, skb->len, skb->csum));
505
506 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
507 err = ip6_xmit(sk, skb, &fl, opt, 0);
508 err = net_xmit_eval(err);
509 }
510
511 done:
512 if (opt && opt != np->opt)
513 sock_kfree_s(sk, opt, opt->tot_len);
514 dst_release(dst);
515 return err;
516 }
517
518 static inline void syn_flood_warning(struct sk_buff *skb)
519 {
520 #ifdef CONFIG_SYN_COOKIES
521 if (sysctl_tcp_syncookies)
522 printk(KERN_INFO
523 "TCPv6: Possible SYN flooding on port %d. "
524 "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
525 else
526 #endif
527 printk(KERN_INFO
528 "TCPv6: Possible SYN flooding on port %d. "
529 "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
530 }
531
532 static void tcp_v6_reqsk_destructor(struct request_sock *req)
533 {
534 if (inet6_rsk(req)->pktopts)
535 kfree_skb(inet6_rsk(req)->pktopts);
536 }
537
538 #ifdef CONFIG_TCP_MD5SIG
539 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
540 struct in6_addr *addr)
541 {
542 struct tcp_sock *tp = tcp_sk(sk);
543 int i;
544
545 BUG_ON(tp == NULL);
546
547 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
548 return NULL;
549
550 for (i = 0; i < tp->md5sig_info->entries6; i++) {
551 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
552 return &tp->md5sig_info->keys6[i].base;
553 }
554 return NULL;
555 }
556
557 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
558 struct sock *addr_sk)
559 {
560 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
561 }
562
563 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
564 struct request_sock *req)
565 {
566 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
567 }
568
569 static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
570 char *newkey, u8 newkeylen)
571 {
572 /* Add key to the list */
573 struct tcp_md5sig_key *key;
574 struct tcp_sock *tp = tcp_sk(sk);
575 struct tcp6_md5sig_key *keys;
576
577 key = tcp_v6_md5_do_lookup(sk, peer);
578 if (key) {
579 /* modify existing entry - just update that one */
580 kfree(key->key);
581 key->key = newkey;
582 key->keylen = newkeylen;
583 } else {
584 /* reallocate new list if current one is full. */
585 if (!tp->md5sig_info) {
586 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
587 if (!tp->md5sig_info) {
588 kfree(newkey);
589 return -ENOMEM;
590 }
591 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
592 }
593 if (tcp_alloc_md5sig_pool() == NULL) {
594 kfree(newkey);
595 return -ENOMEM;
596 }
597 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
598 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
599 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
600
601 if (!keys) {
602 tcp_free_md5sig_pool();
603 kfree(newkey);
604 return -ENOMEM;
605 }
606
607 if (tp->md5sig_info->entries6)
608 memmove(keys, tp->md5sig_info->keys6,
609 (sizeof (tp->md5sig_info->keys6[0]) *
610 tp->md5sig_info->entries6));
611
612 kfree(tp->md5sig_info->keys6);
613 tp->md5sig_info->keys6 = keys;
614 tp->md5sig_info->alloced6++;
615 }
616
617 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
618 peer);
619 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
620 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
621
622 tp->md5sig_info->entries6++;
623 }
624 return 0;
625 }
626
627 static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
628 u8 *newkey, __u8 newkeylen)
629 {
630 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
631 newkey, newkeylen);
632 }
633
634 static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
635 {
636 struct tcp_sock *tp = tcp_sk(sk);
637 int i;
638
639 for (i = 0; i < tp->md5sig_info->entries6; i++) {
640 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
641 /* Free the key */
642 kfree(tp->md5sig_info->keys6[i].base.key);
643 tp->md5sig_info->entries6--;
644
645 if (tp->md5sig_info->entries6 == 0) {
646 kfree(tp->md5sig_info->keys6);
647 tp->md5sig_info->keys6 = NULL;
648 tp->md5sig_info->alloced6 = 0;
649 } else {
650 /* shrink the database */
651 if (tp->md5sig_info->entries6 != i)
652 memmove(&tp->md5sig_info->keys6[i],
653 &tp->md5sig_info->keys6[i+1],
654 (tp->md5sig_info->entries6 - i)
655 * sizeof (tp->md5sig_info->keys6[0]));
656 }
657 tcp_free_md5sig_pool();
658 return 0;
659 }
660 }
661 return -ENOENT;
662 }
663
664 static void tcp_v6_clear_md5_list (struct sock *sk)
665 {
666 struct tcp_sock *tp = tcp_sk(sk);
667 int i;
668
669 if (tp->md5sig_info->entries6) {
670 for (i = 0; i < tp->md5sig_info->entries6; i++)
671 kfree(tp->md5sig_info->keys6[i].base.key);
672 tp->md5sig_info->entries6 = 0;
673 tcp_free_md5sig_pool();
674 }
675
676 kfree(tp->md5sig_info->keys6);
677 tp->md5sig_info->keys6 = NULL;
678 tp->md5sig_info->alloced6 = 0;
679
680 if (tp->md5sig_info->entries4) {
681 for (i = 0; i < tp->md5sig_info->entries4; i++)
682 kfree(tp->md5sig_info->keys4[i].base.key);
683 tp->md5sig_info->entries4 = 0;
684 tcp_free_md5sig_pool();
685 }
686
687 kfree(tp->md5sig_info->keys4);
688 tp->md5sig_info->keys4 = NULL;
689 tp->md5sig_info->alloced4 = 0;
690 }
691
692 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
693 int optlen)
694 {
695 struct tcp_md5sig cmd;
696 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
697 u8 *newkey;
698
699 if (optlen < sizeof(cmd))
700 return -EINVAL;
701
702 if (copy_from_user(&cmd, optval, sizeof(cmd)))
703 return -EFAULT;
704
705 if (sin6->sin6_family != AF_INET6)
706 return -EINVAL;
707
708 if (!cmd.tcpm_keylen) {
709 if (!tcp_sk(sk)->md5sig_info)
710 return -ENOENT;
711 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
712 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
713 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
714 }
715
716 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
717 return -EINVAL;
718
719 if (!tcp_sk(sk)->md5sig_info) {
720 struct tcp_sock *tp = tcp_sk(sk);
721 struct tcp_md5sig_info *p;
722
723 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
724 if (!p)
725 return -ENOMEM;
726
727 tp->md5sig_info = p;
728 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
729 }
730
731 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
732 if (!newkey)
733 return -ENOMEM;
734 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
735 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
736 newkey, cmd.tcpm_keylen);
737 }
738 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
739 }
740
741 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
742 struct in6_addr *daddr,
743 struct in6_addr *saddr, int nbytes)
744 {
745 struct tcp6_pseudohdr *bp;
746 struct scatterlist sg;
747
748 bp = &hp->md5_blk.ip6;
749 /* 1. TCP pseudo-header (RFC2460) */
750 ipv6_addr_copy(&bp->saddr, saddr);
751 ipv6_addr_copy(&bp->daddr, daddr);
752 bp->protocol = cpu_to_be32(IPPROTO_TCP);
753 bp->len = cpu_to_be32(nbytes);
754
755 sg_init_one(&sg, bp, sizeof(*bp));
756 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
757 }
758
759 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
760 struct in6_addr *daddr, struct in6_addr *saddr,
761 struct tcphdr *th)
762 {
763 struct tcp_md5sig_pool *hp;
764 struct hash_desc *desc;
765
766 hp = tcp_get_md5sig_pool();
767 if (!hp)
768 goto clear_hash_noput;
769 desc = &hp->md5_desc;
770
771 if (crypto_hash_init(desc))
772 goto clear_hash;
773 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
774 goto clear_hash;
775 if (tcp_md5_hash_header(hp, th))
776 goto clear_hash;
777 if (tcp_md5_hash_key(hp, key))
778 goto clear_hash;
779 if (crypto_hash_final(desc, md5_hash))
780 goto clear_hash;
781
782 tcp_put_md5sig_pool();
783 return 0;
784
785 clear_hash:
786 tcp_put_md5sig_pool();
787 clear_hash_noput:
788 memset(md5_hash, 0, 16);
789 return 1;
790 }
791
792 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
793 struct sock *sk, struct request_sock *req,
794 struct sk_buff *skb)
795 {
796 struct in6_addr *saddr, *daddr;
797 struct tcp_md5sig_pool *hp;
798 struct hash_desc *desc;
799 struct tcphdr *th = tcp_hdr(skb);
800
801 if (sk) {
802 saddr = &inet6_sk(sk)->saddr;
803 daddr = &inet6_sk(sk)->daddr;
804 } else if (req) {
805 saddr = &inet6_rsk(req)->loc_addr;
806 daddr = &inet6_rsk(req)->rmt_addr;
807 } else {
808 struct ipv6hdr *ip6h = ipv6_hdr(skb);
809 saddr = &ip6h->saddr;
810 daddr = &ip6h->daddr;
811 }
812
813 hp = tcp_get_md5sig_pool();
814 if (!hp)
815 goto clear_hash_noput;
816 desc = &hp->md5_desc;
817
818 if (crypto_hash_init(desc))
819 goto clear_hash;
820
821 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
822 goto clear_hash;
823 if (tcp_md5_hash_header(hp, th))
824 goto clear_hash;
825 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
826 goto clear_hash;
827 if (tcp_md5_hash_key(hp, key))
828 goto clear_hash;
829 if (crypto_hash_final(desc, md5_hash))
830 goto clear_hash;
831
832 tcp_put_md5sig_pool();
833 return 0;
834
835 clear_hash:
836 tcp_put_md5sig_pool();
837 clear_hash_noput:
838 memset(md5_hash, 0, 16);
839 return 1;
840 }
841
842 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
843 {
844 __u8 *hash_location = NULL;
845 struct tcp_md5sig_key *hash_expected;
846 struct ipv6hdr *ip6h = ipv6_hdr(skb);
847 struct tcphdr *th = tcp_hdr(skb);
848 int genhash;
849 u8 newhash[16];
850
851 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
852 hash_location = tcp_parse_md5sig_option(th);
853
854 /* We've parsed the options - do we have a hash? */
855 if (!hash_expected && !hash_location)
856 return 0;
857
858 if (hash_expected && !hash_location) {
859 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
860 return 1;
861 }
862
863 if (!hash_expected && hash_location) {
864 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
865 return 1;
866 }
867
868 /* check the signature */
869 genhash = tcp_v6_md5_hash_skb(newhash,
870 hash_expected,
871 NULL, NULL, skb);
872
873 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
874 if (net_ratelimit()) {
875 printk(KERN_INFO "MD5 Hash %s for "
876 "(" NIP6_FMT ", %u)->"
877 "(" NIP6_FMT ", %u)\n",
878 genhash ? "failed" : "mismatch",
879 NIP6(ip6h->saddr), ntohs(th->source),
880 NIP6(ip6h->daddr), ntohs(th->dest));
881 }
882 return 1;
883 }
884 return 0;
885 }
886 #endif
887
888 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
889 .family = AF_INET6,
890 .obj_size = sizeof(struct tcp6_request_sock),
891 .rtx_syn_ack = tcp_v6_send_synack,
892 .send_ack = tcp_v6_reqsk_send_ack,
893 .destructor = tcp_v6_reqsk_destructor,
894 .send_reset = tcp_v6_send_reset
895 };
896
897 #ifdef CONFIG_TCP_MD5SIG
898 static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
899 .md5_lookup = tcp_v6_reqsk_md5_lookup,
900 };
901 #endif
902
903 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
904 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
905 .twsk_unique = tcp_twsk_unique,
906 .twsk_destructor= tcp_twsk_destructor,
907 };
908
909 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
910 {
911 struct ipv6_pinfo *np = inet6_sk(sk);
912 struct tcphdr *th = tcp_hdr(skb);
913
914 if (skb->ip_summed == CHECKSUM_PARTIAL) {
915 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
916 skb->csum_start = skb_transport_header(skb) - skb->head;
917 skb->csum_offset = offsetof(struct tcphdr, check);
918 } else {
919 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
920 csum_partial((char *)th, th->doff<<2,
921 skb->csum));
922 }
923 }
924
925 static int tcp_v6_gso_send_check(struct sk_buff *skb)
926 {
927 struct ipv6hdr *ipv6h;
928 struct tcphdr *th;
929
930 if (!pskb_may_pull(skb, sizeof(*th)))
931 return -EINVAL;
932
933 ipv6h = ipv6_hdr(skb);
934 th = tcp_hdr(skb);
935
936 th->check = 0;
937 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
938 IPPROTO_TCP, 0);
939 skb->csum_start = skb_transport_header(skb) - skb->head;
940 skb->csum_offset = offsetof(struct tcphdr, check);
941 skb->ip_summed = CHECKSUM_PARTIAL;
942 return 0;
943 }
944
945 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
946 {
947 struct tcphdr *th = tcp_hdr(skb), *t1;
948 struct sk_buff *buff;
949 struct flowi fl;
950 struct net *net = dev_net(skb->dst->dev);
951 struct sock *ctl_sk = net->ipv6.tcp_sk;
952 unsigned int tot_len = sizeof(*th);
953 #ifdef CONFIG_TCP_MD5SIG
954 struct tcp_md5sig_key *key;
955 #endif
956
957 if (th->rst)
958 return;
959
960 if (!ipv6_unicast_destination(skb))
961 return;
962
963 #ifdef CONFIG_TCP_MD5SIG
964 if (sk)
965 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
966 else
967 key = NULL;
968
969 if (key)
970 tot_len += TCPOLEN_MD5SIG_ALIGNED;
971 #endif
972
973 /*
974 * We need to grab some memory, and put together an RST,
975 * and then put it into the queue to be sent.
976 */
977
978 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
979 GFP_ATOMIC);
980 if (buff == NULL)
981 return;
982
983 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
984
985 t1 = (struct tcphdr *) skb_push(buff, tot_len);
986
987 /* Swap the send and the receive. */
988 memset(t1, 0, sizeof(*t1));
989 t1->dest = th->source;
990 t1->source = th->dest;
991 t1->doff = tot_len / 4;
992 t1->rst = 1;
993
994 if(th->ack) {
995 t1->seq = th->ack_seq;
996 } else {
997 t1->ack = 1;
998 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
999 + skb->len - (th->doff<<2));
1000 }
1001
1002 #ifdef CONFIG_TCP_MD5SIG
1003 if (key) {
1004 __be32 *opt = (__be32*)(t1 + 1);
1005 opt[0] = htonl((TCPOPT_NOP << 24) |
1006 (TCPOPT_NOP << 16) |
1007 (TCPOPT_MD5SIG << 8) |
1008 TCPOLEN_MD5SIG);
1009 tcp_v6_md5_hash_hdr((__u8 *)&opt[1], key,
1010 &ipv6_hdr(skb)->saddr,
1011 &ipv6_hdr(skb)->daddr, t1);
1012 }
1013 #endif
1014
1015 buff->csum = csum_partial((char *)t1, tot_len, 0);
1016
1017 memset(&fl, 0, sizeof(fl));
1018 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1019 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1020
1021 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1022 tot_len, IPPROTO_TCP,
1023 buff->csum);
1024
1025 fl.proto = IPPROTO_TCP;
1026 fl.oif = inet6_iif(skb);
1027 fl.fl_ip_dport = t1->dest;
1028 fl.fl_ip_sport = t1->source;
1029 security_skb_classify_flow(skb, &fl);
1030
1031 /* Pass a socket to ip6_dst_lookup either it is for RST
1032 * Underlying function will use this to retrieve the network
1033 * namespace
1034 */
1035 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1036
1037 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1038 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1039 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1040 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1041 return;
1042 }
1043 }
1044
1045 kfree_skb(buff);
1046 }
1047
1048 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1049 struct tcp_md5sig_key *key)
1050 {
1051 struct tcphdr *th = tcp_hdr(skb), *t1;
1052 struct sk_buff *buff;
1053 struct flowi fl;
1054 struct net *net = dev_net(skb->dst->dev);
1055 struct sock *ctl_sk = net->ipv6.tcp_sk;
1056 unsigned int tot_len = sizeof(struct tcphdr);
1057 __be32 *topt;
1058
1059 if (ts)
1060 tot_len += TCPOLEN_TSTAMP_ALIGNED;
1061 #ifdef CONFIG_TCP_MD5SIG
1062 if (key)
1063 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1064 #endif
1065
1066 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1067 GFP_ATOMIC);
1068 if (buff == NULL)
1069 return;
1070
1071 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1072
1073 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1074
1075 /* Swap the send and the receive. */
1076 memset(t1, 0, sizeof(*t1));
1077 t1->dest = th->source;
1078 t1->source = th->dest;
1079 t1->doff = tot_len/4;
1080 t1->seq = htonl(seq);
1081 t1->ack_seq = htonl(ack);
1082 t1->ack = 1;
1083 t1->window = htons(win);
1084
1085 topt = (__be32 *)(t1 + 1);
1086
1087 if (ts) {
1088 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1089 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1090 *topt++ = htonl(tcp_time_stamp);
1091 *topt++ = htonl(ts);
1092 }
1093
1094 #ifdef CONFIG_TCP_MD5SIG
1095 if (key) {
1096 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1097 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1098 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1099 &ipv6_hdr(skb)->saddr,
1100 &ipv6_hdr(skb)->daddr, t1);
1101 }
1102 #endif
1103
1104 buff->csum = csum_partial((char *)t1, tot_len, 0);
1105
1106 memset(&fl, 0, sizeof(fl));
1107 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1108 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1109
1110 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1111 tot_len, IPPROTO_TCP,
1112 buff->csum);
1113
1114 fl.proto = IPPROTO_TCP;
1115 fl.oif = inet6_iif(skb);
1116 fl.fl_ip_dport = t1->dest;
1117 fl.fl_ip_sport = t1->source;
1118 security_skb_classify_flow(skb, &fl);
1119
1120 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1121 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1122 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1123 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1124 return;
1125 }
1126 }
1127
1128 kfree_skb(buff);
1129 }
1130
1131 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1132 {
1133 struct inet_timewait_sock *tw = inet_twsk(sk);
1134 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1135
1136 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1137 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1138 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
1139
1140 inet_twsk_put(tw);
1141 }
1142
1143 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
1144 struct request_sock *req)
1145 {
1146 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1147 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
1148 }
1149
1150
1151 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1152 {
1153 struct request_sock *req, **prev;
1154 const struct tcphdr *th = tcp_hdr(skb);
1155 struct sock *nsk;
1156
1157 /* Find possible connection requests. */
1158 req = inet6_csk_search_req(sk, &prev, th->source,
1159 &ipv6_hdr(skb)->saddr,
1160 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1161 if (req)
1162 return tcp_check_req(sk, skb, req, prev);
1163
1164 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1165 &ipv6_hdr(skb)->saddr, th->source,
1166 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1167
1168 if (nsk) {
1169 if (nsk->sk_state != TCP_TIME_WAIT) {
1170 bh_lock_sock(nsk);
1171 return nsk;
1172 }
1173 inet_twsk_put(inet_twsk(nsk));
1174 return NULL;
1175 }
1176
1177 #ifdef CONFIG_SYN_COOKIES
1178 if (!th->rst && !th->syn && th->ack)
1179 sk = cookie_v6_check(sk, skb);
1180 #endif
1181 return sk;
1182 }
1183
1184 /* FIXME: this is substantially similar to the ipv4 code.
1185 * Can some kind of merge be done? -- erics
1186 */
1187 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1188 {
1189 struct inet6_request_sock *treq;
1190 struct ipv6_pinfo *np = inet6_sk(sk);
1191 struct tcp_options_received tmp_opt;
1192 struct tcp_sock *tp = tcp_sk(sk);
1193 struct request_sock *req = NULL;
1194 __u32 isn = TCP_SKB_CB(skb)->when;
1195 #ifdef CONFIG_SYN_COOKIES
1196 int want_cookie = 0;
1197 #else
1198 #define want_cookie 0
1199 #endif
1200
1201 if (skb->protocol == htons(ETH_P_IP))
1202 return tcp_v4_conn_request(sk, skb);
1203
1204 if (!ipv6_unicast_destination(skb))
1205 goto drop;
1206
1207 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1208 if (net_ratelimit())
1209 syn_flood_warning(skb);
1210 #ifdef CONFIG_SYN_COOKIES
1211 if (sysctl_tcp_syncookies)
1212 want_cookie = 1;
1213 else
1214 #endif
1215 goto drop;
1216 }
1217
1218 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1219 goto drop;
1220
1221 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1222 if (req == NULL)
1223 goto drop;
1224
1225 #ifdef CONFIG_TCP_MD5SIG
1226 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1227 #endif
1228
1229 tcp_clear_options(&tmp_opt);
1230 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1231 tmp_opt.user_mss = tp->rx_opt.user_mss;
1232
1233 tcp_parse_options(skb, &tmp_opt, 0);
1234
1235 if (want_cookie && !tmp_opt.saw_tstamp)
1236 tcp_clear_options(&tmp_opt);
1237
1238 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1239 tcp_openreq_init(req, &tmp_opt, skb);
1240
1241 treq = inet6_rsk(req);
1242 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1243 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1244 if (!want_cookie)
1245 TCP_ECN_create_request(req, tcp_hdr(skb));
1246
1247 if (want_cookie) {
1248 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1249 req->cookie_ts = tmp_opt.tstamp_ok;
1250 } else if (!isn) {
1251 if (ipv6_opt_accepted(sk, skb) ||
1252 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1253 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1254 atomic_inc(&skb->users);
1255 treq->pktopts = skb;
1256 }
1257 treq->iif = sk->sk_bound_dev_if;
1258
1259 /* So that link locals have meaning */
1260 if (!sk->sk_bound_dev_if &&
1261 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1262 treq->iif = inet6_iif(skb);
1263
1264 isn = tcp_v6_init_sequence(skb);
1265 }
1266
1267 tcp_rsk(req)->snt_isn = isn;
1268
1269 security_inet_conn_request(sk, skb, req);
1270
1271 if (tcp_v6_send_synack(sk, req))
1272 goto drop;
1273
1274 if (!want_cookie) {
1275 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1276 return 0;
1277 }
1278
1279 drop:
1280 if (req)
1281 reqsk_free(req);
1282
1283 return 0; /* don't send reset */
1284 }
1285
1286 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1287 struct request_sock *req,
1288 struct dst_entry *dst)
1289 {
1290 struct inet6_request_sock *treq;
1291 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1292 struct tcp6_sock *newtcp6sk;
1293 struct inet_sock *newinet;
1294 struct tcp_sock *newtp;
1295 struct sock *newsk;
1296 struct ipv6_txoptions *opt;
1297 #ifdef CONFIG_TCP_MD5SIG
1298 struct tcp_md5sig_key *key;
1299 #endif
1300
1301 if (skb->protocol == htons(ETH_P_IP)) {
1302 /*
1303 * v6 mapped
1304 */
1305
1306 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1307
1308 if (newsk == NULL)
1309 return NULL;
1310
1311 newtcp6sk = (struct tcp6_sock *)newsk;
1312 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1313
1314 newinet = inet_sk(newsk);
1315 newnp = inet6_sk(newsk);
1316 newtp = tcp_sk(newsk);
1317
1318 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1319
1320 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1321 newinet->daddr);
1322
1323 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1324 newinet->saddr);
1325
1326 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1327
1328 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1329 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1330 #ifdef CONFIG_TCP_MD5SIG
1331 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1332 #endif
1333
1334 newnp->pktoptions = NULL;
1335 newnp->opt = NULL;
1336 newnp->mcast_oif = inet6_iif(skb);
1337 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1338
1339 /*
1340 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1341 * here, tcp_create_openreq_child now does this for us, see the comment in
1342 * that function for the gory details. -acme
1343 */
1344
1345 /* It is tricky place. Until this moment IPv4 tcp
1346 worked with IPv6 icsk.icsk_af_ops.
1347 Sync it now.
1348 */
1349 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1350
1351 return newsk;
1352 }
1353
1354 treq = inet6_rsk(req);
1355 opt = np->opt;
1356
1357 if (sk_acceptq_is_full(sk))
1358 goto out_overflow;
1359
1360 if (dst == NULL) {
1361 struct in6_addr *final_p = NULL, final;
1362 struct flowi fl;
1363
1364 memset(&fl, 0, sizeof(fl));
1365 fl.proto = IPPROTO_TCP;
1366 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1367 if (opt && opt->srcrt) {
1368 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1369 ipv6_addr_copy(&final, &fl.fl6_dst);
1370 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1371 final_p = &final;
1372 }
1373 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1374 fl.oif = sk->sk_bound_dev_if;
1375 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1376 fl.fl_ip_sport = inet_sk(sk)->sport;
1377 security_req_classify_flow(req, &fl);
1378
1379 if (ip6_dst_lookup(sk, &dst, &fl))
1380 goto out;
1381
1382 if (final_p)
1383 ipv6_addr_copy(&fl.fl6_dst, final_p);
1384
1385 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1386 goto out;
1387 }
1388
1389 newsk = tcp_create_openreq_child(sk, req, skb);
1390 if (newsk == NULL)
1391 goto out;
1392
1393 /*
1394 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1395 * count here, tcp_create_openreq_child now does this for us, see the
1396 * comment in that function for the gory details. -acme
1397 */
1398
1399 newsk->sk_gso_type = SKB_GSO_TCPV6;
1400 __ip6_dst_store(newsk, dst, NULL, NULL);
1401
1402 newtcp6sk = (struct tcp6_sock *)newsk;
1403 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1404
1405 newtp = tcp_sk(newsk);
1406 newinet = inet_sk(newsk);
1407 newnp = inet6_sk(newsk);
1408
1409 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1410
1411 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1412 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1413 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1414 newsk->sk_bound_dev_if = treq->iif;
1415
1416 /* Now IPv6 options...
1417
1418 First: no IPv4 options.
1419 */
1420 newinet->opt = NULL;
1421 newnp->ipv6_fl_list = NULL;
1422
1423 /* Clone RX bits */
1424 newnp->rxopt.all = np->rxopt.all;
1425
1426 /* Clone pktoptions received with SYN */
1427 newnp->pktoptions = NULL;
1428 if (treq->pktopts != NULL) {
1429 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1430 kfree_skb(treq->pktopts);
1431 treq->pktopts = NULL;
1432 if (newnp->pktoptions)
1433 skb_set_owner_r(newnp->pktoptions, newsk);
1434 }
1435 newnp->opt = NULL;
1436 newnp->mcast_oif = inet6_iif(skb);
1437 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1438
1439 /* Clone native IPv6 options from listening socket (if any)
1440
1441 Yes, keeping reference count would be much more clever,
1442 but we make one more one thing there: reattach optmem
1443 to newsk.
1444 */
1445 if (opt) {
1446 newnp->opt = ipv6_dup_options(newsk, opt);
1447 if (opt != np->opt)
1448 sock_kfree_s(sk, opt, opt->tot_len);
1449 }
1450
1451 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1452 if (newnp->opt)
1453 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1454 newnp->opt->opt_flen);
1455
1456 tcp_mtup_init(newsk);
1457 tcp_sync_mss(newsk, dst_mtu(dst));
1458 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1459 tcp_initialize_rcv_mss(newsk);
1460
1461 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1462
1463 #ifdef CONFIG_TCP_MD5SIG
1464 /* Copy over the MD5 key from the original socket */
1465 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1466 /* We're using one, so create a matching key
1467 * on the newsk structure. If we fail to get
1468 * memory, then we end up not copying the key
1469 * across. Shucks.
1470 */
1471 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1472 if (newkey != NULL)
1473 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1474 newkey, key->keylen);
1475 }
1476 #endif
1477
1478 __inet6_hash(newsk);
1479 __inet_inherit_port(sk, newsk);
1480
1481 return newsk;
1482
1483 out_overflow:
1484 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1485 out:
1486 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1487 if (opt && opt != np->opt)
1488 sock_kfree_s(sk, opt, opt->tot_len);
1489 dst_release(dst);
1490 return NULL;
1491 }
1492
1493 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1494 {
1495 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1496 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1497 &ipv6_hdr(skb)->daddr, skb->csum)) {
1498 skb->ip_summed = CHECKSUM_UNNECESSARY;
1499 return 0;
1500 }
1501 }
1502
1503 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1504 &ipv6_hdr(skb)->saddr,
1505 &ipv6_hdr(skb)->daddr, 0));
1506
1507 if (skb->len <= 76) {
1508 return __skb_checksum_complete(skb);
1509 }
1510 return 0;
1511 }
1512
1513 /* The socket must have it's spinlock held when we get
1514 * here.
1515 *
1516 * We have a potential double-lock case here, so even when
1517 * doing backlog processing we use the BH locking scheme.
1518 * This is because we cannot sleep with the original spinlock
1519 * held.
1520 */
1521 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1522 {
1523 struct ipv6_pinfo *np = inet6_sk(sk);
1524 struct tcp_sock *tp;
1525 struct sk_buff *opt_skb = NULL;
1526
1527 /* Imagine: socket is IPv6. IPv4 packet arrives,
1528 goes to IPv4 receive handler and backlogged.
1529 From backlog it always goes here. Kerboom...
1530 Fortunately, tcp_rcv_established and rcv_established
1531 handle them correctly, but it is not case with
1532 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1533 */
1534
1535 if (skb->protocol == htons(ETH_P_IP))
1536 return tcp_v4_do_rcv(sk, skb);
1537
1538 #ifdef CONFIG_TCP_MD5SIG
1539 if (tcp_v6_inbound_md5_hash (sk, skb))
1540 goto discard;
1541 #endif
1542
1543 if (sk_filter(sk, skb))
1544 goto discard;
1545
1546 /*
1547 * socket locking is here for SMP purposes as backlog rcv
1548 * is currently called with bh processing disabled.
1549 */
1550
1551 /* Do Stevens' IPV6_PKTOPTIONS.
1552
1553 Yes, guys, it is the only place in our code, where we
1554 may make it not affecting IPv4.
1555 The rest of code is protocol independent,
1556 and I do not like idea to uglify IPv4.
1557
1558 Actually, all the idea behind IPV6_PKTOPTIONS
1559 looks not very well thought. For now we latch
1560 options, received in the last packet, enqueued
1561 by tcp. Feel free to propose better solution.
1562 --ANK (980728)
1563 */
1564 if (np->rxopt.all)
1565 opt_skb = skb_clone(skb, GFP_ATOMIC);
1566
1567 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1568 TCP_CHECK_TIMER(sk);
1569 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1570 goto reset;
1571 TCP_CHECK_TIMER(sk);
1572 if (opt_skb)
1573 goto ipv6_pktoptions;
1574 return 0;
1575 }
1576
1577 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1578 goto csum_err;
1579
1580 if (sk->sk_state == TCP_LISTEN) {
1581 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1582 if (!nsk)
1583 goto discard;
1584
1585 /*
1586 * Queue it on the new socket if the new socket is active,
1587 * otherwise we just shortcircuit this and continue with
1588 * the new socket..
1589 */
1590 if(nsk != sk) {
1591 if (tcp_child_process(sk, nsk, skb))
1592 goto reset;
1593 if (opt_skb)
1594 __kfree_skb(opt_skb);
1595 return 0;
1596 }
1597 }
1598
1599 TCP_CHECK_TIMER(sk);
1600 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1601 goto reset;
1602 TCP_CHECK_TIMER(sk);
1603 if (opt_skb)
1604 goto ipv6_pktoptions;
1605 return 0;
1606
1607 reset:
1608 tcp_v6_send_reset(sk, skb);
1609 discard:
1610 if (opt_skb)
1611 __kfree_skb(opt_skb);
1612 kfree_skb(skb);
1613 return 0;
1614 csum_err:
1615 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1616 goto discard;
1617
1618
1619 ipv6_pktoptions:
1620 /* Do you ask, what is it?
1621
1622 1. skb was enqueued by tcp.
1623 2. skb is added to tail of read queue, rather than out of order.
1624 3. socket is not in passive state.
1625 4. Finally, it really contains options, which user wants to receive.
1626 */
1627 tp = tcp_sk(sk);
1628 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1629 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1630 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1631 np->mcast_oif = inet6_iif(opt_skb);
1632 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1633 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1634 if (ipv6_opt_accepted(sk, opt_skb)) {
1635 skb_set_owner_r(opt_skb, sk);
1636 opt_skb = xchg(&np->pktoptions, opt_skb);
1637 } else {
1638 __kfree_skb(opt_skb);
1639 opt_skb = xchg(&np->pktoptions, NULL);
1640 }
1641 }
1642
1643 if (opt_skb)
1644 kfree_skb(opt_skb);
1645 return 0;
1646 }
1647
1648 static int tcp_v6_rcv(struct sk_buff *skb)
1649 {
1650 struct tcphdr *th;
1651 struct sock *sk;
1652 int ret;
1653 struct net *net = dev_net(skb->dev);
1654
1655 if (skb->pkt_type != PACKET_HOST)
1656 goto discard_it;
1657
1658 /*
1659 * Count it even if it's bad.
1660 */
1661 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1662
1663 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1664 goto discard_it;
1665
1666 th = tcp_hdr(skb);
1667
1668 if (th->doff < sizeof(struct tcphdr)/4)
1669 goto bad_packet;
1670 if (!pskb_may_pull(skb, th->doff*4))
1671 goto discard_it;
1672
1673 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1674 goto bad_packet;
1675
1676 th = tcp_hdr(skb);
1677 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1678 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1679 skb->len - th->doff*4);
1680 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1681 TCP_SKB_CB(skb)->when = 0;
1682 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1683 TCP_SKB_CB(skb)->sacked = 0;
1684
1685 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1686 if (!sk)
1687 goto no_tcp_socket;
1688
1689 process:
1690 if (sk->sk_state == TCP_TIME_WAIT)
1691 goto do_time_wait;
1692
1693 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1694 goto discard_and_relse;
1695
1696 if (sk_filter(sk, skb))
1697 goto discard_and_relse;
1698
1699 skb->dev = NULL;
1700
1701 bh_lock_sock_nested(sk);
1702 ret = 0;
1703 if (!sock_owned_by_user(sk)) {
1704 #ifdef CONFIG_NET_DMA
1705 struct tcp_sock *tp = tcp_sk(sk);
1706 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1707 tp->ucopy.dma_chan = get_softnet_dma();
1708 if (tp->ucopy.dma_chan)
1709 ret = tcp_v6_do_rcv(sk, skb);
1710 else
1711 #endif
1712 {
1713 if (!tcp_prequeue(sk, skb))
1714 ret = tcp_v6_do_rcv(sk, skb);
1715 }
1716 } else
1717 sk_add_backlog(sk, skb);
1718 bh_unlock_sock(sk);
1719
1720 sock_put(sk);
1721 return ret ? -1 : 0;
1722
1723 no_tcp_socket:
1724 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1725 goto discard_it;
1726
1727 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1728 bad_packet:
1729 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1730 } else {
1731 tcp_v6_send_reset(NULL, skb);
1732 }
1733
1734 discard_it:
1735
1736 /*
1737 * Discard frame
1738 */
1739
1740 kfree_skb(skb);
1741 return 0;
1742
1743 discard_and_relse:
1744 sock_put(sk);
1745 goto discard_it;
1746
1747 do_time_wait:
1748 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1749 inet_twsk_put(inet_twsk(sk));
1750 goto discard_it;
1751 }
1752
1753 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1754 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1755 inet_twsk_put(inet_twsk(sk));
1756 goto discard_it;
1757 }
1758
1759 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1760 case TCP_TW_SYN:
1761 {
1762 struct sock *sk2;
1763
1764 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1765 &ipv6_hdr(skb)->daddr,
1766 ntohs(th->dest), inet6_iif(skb));
1767 if (sk2 != NULL) {
1768 struct inet_timewait_sock *tw = inet_twsk(sk);
1769 inet_twsk_deschedule(tw, &tcp_death_row);
1770 inet_twsk_put(tw);
1771 sk = sk2;
1772 goto process;
1773 }
1774 /* Fall through to ACK */
1775 }
1776 case TCP_TW_ACK:
1777 tcp_v6_timewait_ack(sk, skb);
1778 break;
1779 case TCP_TW_RST:
1780 goto no_tcp_socket;
1781 case TCP_TW_SUCCESS:;
1782 }
1783 goto discard_it;
1784 }
1785
1786 static int tcp_v6_remember_stamp(struct sock *sk)
1787 {
1788 /* Alas, not yet... */
1789 return 0;
1790 }
1791
1792 static struct inet_connection_sock_af_ops ipv6_specific = {
1793 .queue_xmit = inet6_csk_xmit,
1794 .send_check = tcp_v6_send_check,
1795 .rebuild_header = inet6_sk_rebuild_header,
1796 .conn_request = tcp_v6_conn_request,
1797 .syn_recv_sock = tcp_v6_syn_recv_sock,
1798 .remember_stamp = tcp_v6_remember_stamp,
1799 .net_header_len = sizeof(struct ipv6hdr),
1800 .setsockopt = ipv6_setsockopt,
1801 .getsockopt = ipv6_getsockopt,
1802 .addr2sockaddr = inet6_csk_addr2sockaddr,
1803 .sockaddr_len = sizeof(struct sockaddr_in6),
1804 .bind_conflict = inet6_csk_bind_conflict,
1805 #ifdef CONFIG_COMPAT
1806 .compat_setsockopt = compat_ipv6_setsockopt,
1807 .compat_getsockopt = compat_ipv6_getsockopt,
1808 #endif
1809 };
1810
1811 #ifdef CONFIG_TCP_MD5SIG
1812 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1813 .md5_lookup = tcp_v6_md5_lookup,
1814 .calc_md5_hash = tcp_v6_md5_hash_skb,
1815 .md5_add = tcp_v6_md5_add_func,
1816 .md5_parse = tcp_v6_parse_md5_keys,
1817 };
1818 #endif
1819
1820 /*
1821 * TCP over IPv4 via INET6 API
1822 */
1823
1824 static struct inet_connection_sock_af_ops ipv6_mapped = {
1825 .queue_xmit = ip_queue_xmit,
1826 .send_check = tcp_v4_send_check,
1827 .rebuild_header = inet_sk_rebuild_header,
1828 .conn_request = tcp_v6_conn_request,
1829 .syn_recv_sock = tcp_v6_syn_recv_sock,
1830 .remember_stamp = tcp_v4_remember_stamp,
1831 .net_header_len = sizeof(struct iphdr),
1832 .setsockopt = ipv6_setsockopt,
1833 .getsockopt = ipv6_getsockopt,
1834 .addr2sockaddr = inet6_csk_addr2sockaddr,
1835 .sockaddr_len = sizeof(struct sockaddr_in6),
1836 .bind_conflict = inet6_csk_bind_conflict,
1837 #ifdef CONFIG_COMPAT
1838 .compat_setsockopt = compat_ipv6_setsockopt,
1839 .compat_getsockopt = compat_ipv6_getsockopt,
1840 #endif
1841 };
1842
1843 #ifdef CONFIG_TCP_MD5SIG
1844 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1845 .md5_lookup = tcp_v4_md5_lookup,
1846 .calc_md5_hash = tcp_v4_md5_hash_skb,
1847 .md5_add = tcp_v6_md5_add_func,
1848 .md5_parse = tcp_v6_parse_md5_keys,
1849 };
1850 #endif
1851
1852 /* NOTE: A lot of things set to zero explicitly by call to
1853 * sk_alloc() so need not be done here.
1854 */
1855 static int tcp_v6_init_sock(struct sock *sk)
1856 {
1857 struct inet_connection_sock *icsk = inet_csk(sk);
1858 struct tcp_sock *tp = tcp_sk(sk);
1859
1860 skb_queue_head_init(&tp->out_of_order_queue);
1861 tcp_init_xmit_timers(sk);
1862 tcp_prequeue_init(tp);
1863
1864 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1865 tp->mdev = TCP_TIMEOUT_INIT;
1866
1867 /* So many TCP implementations out there (incorrectly) count the
1868 * initial SYN frame in their delayed-ACK and congestion control
1869 * algorithms that we must have the following bandaid to talk
1870 * efficiently to them. -DaveM
1871 */
1872 tp->snd_cwnd = 2;
1873
1874 /* See draft-stevens-tcpca-spec-01 for discussion of the
1875 * initialization of these values.
1876 */
1877 tp->snd_ssthresh = 0x7fffffff;
1878 tp->snd_cwnd_clamp = ~0;
1879 tp->mss_cache = 536;
1880
1881 tp->reordering = sysctl_tcp_reordering;
1882
1883 sk->sk_state = TCP_CLOSE;
1884
1885 icsk->icsk_af_ops = &ipv6_specific;
1886 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1887 icsk->icsk_sync_mss = tcp_sync_mss;
1888 sk->sk_write_space = sk_stream_write_space;
1889 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1890
1891 #ifdef CONFIG_TCP_MD5SIG
1892 tp->af_specific = &tcp_sock_ipv6_specific;
1893 #endif
1894
1895 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1896 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1897
1898 atomic_inc(&tcp_sockets_allocated);
1899
1900 return 0;
1901 }
1902
1903 static void tcp_v6_destroy_sock(struct sock *sk)
1904 {
1905 #ifdef CONFIG_TCP_MD5SIG
1906 /* Clean up the MD5 key list */
1907 if (tcp_sk(sk)->md5sig_info)
1908 tcp_v6_clear_md5_list(sk);
1909 #endif
1910 tcp_v4_destroy_sock(sk);
1911 inet6_destroy_sock(sk);
1912 }
1913
1914 #ifdef CONFIG_PROC_FS
1915 /* Proc filesystem TCPv6 sock list dumping. */
1916 static void get_openreq6(struct seq_file *seq,
1917 struct sock *sk, struct request_sock *req, int i, int uid)
1918 {
1919 int ttd = req->expires - jiffies;
1920 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1921 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1922
1923 if (ttd < 0)
1924 ttd = 0;
1925
1926 seq_printf(seq,
1927 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1928 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1929 i,
1930 src->s6_addr32[0], src->s6_addr32[1],
1931 src->s6_addr32[2], src->s6_addr32[3],
1932 ntohs(inet_sk(sk)->sport),
1933 dest->s6_addr32[0], dest->s6_addr32[1],
1934 dest->s6_addr32[2], dest->s6_addr32[3],
1935 ntohs(inet_rsk(req)->rmt_port),
1936 TCP_SYN_RECV,
1937 0,0, /* could print option size, but that is af dependent. */
1938 1, /* timers active (only the expire timer) */
1939 jiffies_to_clock_t(ttd),
1940 req->retrans,
1941 uid,
1942 0, /* non standard timer */
1943 0, /* open_requests have no inode */
1944 0, req);
1945 }
1946
1947 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1948 {
1949 struct in6_addr *dest, *src;
1950 __u16 destp, srcp;
1951 int timer_active;
1952 unsigned long timer_expires;
1953 struct inet_sock *inet = inet_sk(sp);
1954 struct tcp_sock *tp = tcp_sk(sp);
1955 const struct inet_connection_sock *icsk = inet_csk(sp);
1956 struct ipv6_pinfo *np = inet6_sk(sp);
1957
1958 dest = &np->daddr;
1959 src = &np->rcv_saddr;
1960 destp = ntohs(inet->dport);
1961 srcp = ntohs(inet->sport);
1962
1963 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1964 timer_active = 1;
1965 timer_expires = icsk->icsk_timeout;
1966 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1967 timer_active = 4;
1968 timer_expires = icsk->icsk_timeout;
1969 } else if (timer_pending(&sp->sk_timer)) {
1970 timer_active = 2;
1971 timer_expires = sp->sk_timer.expires;
1972 } else {
1973 timer_active = 0;
1974 timer_expires = jiffies;
1975 }
1976
1977 seq_printf(seq,
1978 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1979 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
1980 i,
1981 src->s6_addr32[0], src->s6_addr32[1],
1982 src->s6_addr32[2], src->s6_addr32[3], srcp,
1983 dest->s6_addr32[0], dest->s6_addr32[1],
1984 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1985 sp->sk_state,
1986 tp->write_seq-tp->snd_una,
1987 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1988 timer_active,
1989 jiffies_to_clock_t(timer_expires - jiffies),
1990 icsk->icsk_retransmits,
1991 sock_i_uid(sp),
1992 icsk->icsk_probes_out,
1993 sock_i_ino(sp),
1994 atomic_read(&sp->sk_refcnt), sp,
1995 jiffies_to_clock_t(icsk->icsk_rto),
1996 jiffies_to_clock_t(icsk->icsk_ack.ato),
1997 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
1998 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
1999 );
2000 }
2001
2002 static void get_timewait6_sock(struct seq_file *seq,
2003 struct inet_timewait_sock *tw, int i)
2004 {
2005 struct in6_addr *dest, *src;
2006 __u16 destp, srcp;
2007 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
2008 int ttd = tw->tw_ttd - jiffies;
2009
2010 if (ttd < 0)
2011 ttd = 0;
2012
2013 dest = &tw6->tw_v6_daddr;
2014 src = &tw6->tw_v6_rcv_saddr;
2015 destp = ntohs(tw->tw_dport);
2016 srcp = ntohs(tw->tw_sport);
2017
2018 seq_printf(seq,
2019 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2020 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
2021 i,
2022 src->s6_addr32[0], src->s6_addr32[1],
2023 src->s6_addr32[2], src->s6_addr32[3], srcp,
2024 dest->s6_addr32[0], dest->s6_addr32[1],
2025 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2026 tw->tw_substate, 0, 0,
2027 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2028 atomic_read(&tw->tw_refcnt), tw);
2029 }
2030
2031 static int tcp6_seq_show(struct seq_file *seq, void *v)
2032 {
2033 struct tcp_iter_state *st;
2034
2035 if (v == SEQ_START_TOKEN) {
2036 seq_puts(seq,
2037 " sl "
2038 "local_address "
2039 "remote_address "
2040 "st tx_queue rx_queue tr tm->when retrnsmt"
2041 " uid timeout inode\n");
2042 goto out;
2043 }
2044 st = seq->private;
2045
2046 switch (st->state) {
2047 case TCP_SEQ_STATE_LISTENING:
2048 case TCP_SEQ_STATE_ESTABLISHED:
2049 get_tcp6_sock(seq, v, st->num);
2050 break;
2051 case TCP_SEQ_STATE_OPENREQ:
2052 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2053 break;
2054 case TCP_SEQ_STATE_TIME_WAIT:
2055 get_timewait6_sock(seq, v, st->num);
2056 break;
2057 }
2058 out:
2059 return 0;
2060 }
2061
2062 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2063 .name = "tcp6",
2064 .family = AF_INET6,
2065 .seq_fops = {
2066 .owner = THIS_MODULE,
2067 },
2068 .seq_ops = {
2069 .show = tcp6_seq_show,
2070 },
2071 };
2072
2073 int tcp6_proc_init(struct net *net)
2074 {
2075 return tcp_proc_register(net, &tcp6_seq_afinfo);
2076 }
2077
2078 void tcp6_proc_exit(struct net *net)
2079 {
2080 tcp_proc_unregister(net, &tcp6_seq_afinfo);
2081 }
2082 #endif
2083
2084 struct proto tcpv6_prot = {
2085 .name = "TCPv6",
2086 .owner = THIS_MODULE,
2087 .close = tcp_close,
2088 .connect = tcp_v6_connect,
2089 .disconnect = tcp_disconnect,
2090 .accept = inet_csk_accept,
2091 .ioctl = tcp_ioctl,
2092 .init = tcp_v6_init_sock,
2093 .destroy = tcp_v6_destroy_sock,
2094 .shutdown = tcp_shutdown,
2095 .setsockopt = tcp_setsockopt,
2096 .getsockopt = tcp_getsockopt,
2097 .recvmsg = tcp_recvmsg,
2098 .backlog_rcv = tcp_v6_do_rcv,
2099 .hash = tcp_v6_hash,
2100 .unhash = inet_unhash,
2101 .get_port = inet_csk_get_port,
2102 .enter_memory_pressure = tcp_enter_memory_pressure,
2103 .sockets_allocated = &tcp_sockets_allocated,
2104 .memory_allocated = &tcp_memory_allocated,
2105 .memory_pressure = &tcp_memory_pressure,
2106 .orphan_count = &tcp_orphan_count,
2107 .sysctl_mem = sysctl_tcp_mem,
2108 .sysctl_wmem = sysctl_tcp_wmem,
2109 .sysctl_rmem = sysctl_tcp_rmem,
2110 .max_header = MAX_TCP_HEADER,
2111 .obj_size = sizeof(struct tcp6_sock),
2112 .twsk_prot = &tcp6_timewait_sock_ops,
2113 .rsk_prot = &tcp6_request_sock_ops,
2114 .h.hashinfo = &tcp_hashinfo,
2115 #ifdef CONFIG_COMPAT
2116 .compat_setsockopt = compat_tcp_setsockopt,
2117 .compat_getsockopt = compat_tcp_getsockopt,
2118 #endif
2119 };
2120
2121 static struct inet6_protocol tcpv6_protocol = {
2122 .handler = tcp_v6_rcv,
2123 .err_handler = tcp_v6_err,
2124 .gso_send_check = tcp_v6_gso_send_check,
2125 .gso_segment = tcp_tso_segment,
2126 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2127 };
2128
2129 static struct inet_protosw tcpv6_protosw = {
2130 .type = SOCK_STREAM,
2131 .protocol = IPPROTO_TCP,
2132 .prot = &tcpv6_prot,
2133 .ops = &inet6_stream_ops,
2134 .capability = -1,
2135 .no_check = 0,
2136 .flags = INET_PROTOSW_PERMANENT |
2137 INET_PROTOSW_ICSK,
2138 };
2139
2140 static int tcpv6_net_init(struct net *net)
2141 {
2142 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2143 SOCK_RAW, IPPROTO_TCP, net);
2144 }
2145
2146 static void tcpv6_net_exit(struct net *net)
2147 {
2148 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
2149 inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6);
2150 }
2151
2152 static struct pernet_operations tcpv6_net_ops = {
2153 .init = tcpv6_net_init,
2154 .exit = tcpv6_net_exit,
2155 };
2156
2157 int __init tcpv6_init(void)
2158 {
2159 int ret;
2160
2161 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2162 if (ret)
2163 goto out;
2164
2165 /* register inet6 protocol */
2166 ret = inet6_register_protosw(&tcpv6_protosw);
2167 if (ret)
2168 goto out_tcpv6_protocol;
2169
2170 ret = register_pernet_subsys(&tcpv6_net_ops);
2171 if (ret)
2172 goto out_tcpv6_protosw;
2173 out:
2174 return ret;
2175
2176 out_tcpv6_protocol:
2177 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2178 out_tcpv6_protosw:
2179 inet6_unregister_protosw(&tcpv6_protosw);
2180 goto out;
2181 }
2182
2183 void tcpv6_exit(void)
2184 {
2185 unregister_pernet_subsys(&tcpv6_net_ops);
2186 inet6_unregister_protosw(&tcpv6_protosw);
2187 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2188 }
Linux kernel - Deliverables
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