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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6/mini2440.git] / net / ipv6 / tcp_ipv6.c
blobae45f98350143e524798fa6ef4b8014c07685dc1
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 sk_buff *skb, struct request_sock *req);
73
74 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
75
76 static struct inet_connection_sock_af_ops ipv6_mapped;
77 static struct inet_connection_sock_af_ops ipv6_specific;
78 #ifdef CONFIG_TCP_MD5SIG
79 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
80 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
81 #else
82 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
83 struct in6_addr *addr)
84 {
85 return NULL;
86 }
87 #endif
88
89 static void tcp_v6_hash(struct sock *sk)
90 {
91 if (sk->sk_state != TCP_CLOSE) {
92 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
93 tcp_prot.hash(sk);
94 return;
95 }
96 local_bh_disable();
97 __inet6_hash(sk);
98 local_bh_enable();
99 }
100 }
101
102 static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
103 struct in6_addr *saddr,
104 struct in6_addr *daddr,
105 __wsum base)
106 {
107 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
108 }
109
110 static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
111 {
112 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
113 ipv6_hdr(skb)->saddr.s6_addr32,
114 tcp_hdr(skb)->dest,
115 tcp_hdr(skb)->source);
116 }
117
118 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
119 int addr_len)
120 {
121 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
122 struct inet_sock *inet = inet_sk(sk);
123 struct inet_connection_sock *icsk = inet_csk(sk);
124 struct ipv6_pinfo *np = inet6_sk(sk);
125 struct tcp_sock *tp = tcp_sk(sk);
126 struct in6_addr *saddr = NULL, *final_p = NULL, final;
127 struct flowi fl;
128 struct dst_entry *dst;
129 int addr_type;
130 int err;
131
132 if (addr_len < SIN6_LEN_RFC2133)
133 return -EINVAL;
134
135 if (usin->sin6_family != AF_INET6)
136 return(-EAFNOSUPPORT);
137
138 memset(&fl, 0, sizeof(fl));
139
140 if (np->sndflow) {
141 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
142 IP6_ECN_flow_init(fl.fl6_flowlabel);
143 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
144 struct ip6_flowlabel *flowlabel;
145 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
146 if (flowlabel == NULL)
147 return -EINVAL;
148 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
149 fl6_sock_release(flowlabel);
150 }
151 }
152
153 /*
154 * connect() to INADDR_ANY means loopback (BSD'ism).
155 */
156
157 if(ipv6_addr_any(&usin->sin6_addr))
158 usin->sin6_addr.s6_addr[15] = 0x1;
159
160 addr_type = ipv6_addr_type(&usin->sin6_addr);
161
162 if(addr_type & IPV6_ADDR_MULTICAST)
163 return -ENETUNREACH;
164
165 if (addr_type&IPV6_ADDR_LINKLOCAL) {
166 if (addr_len >= sizeof(struct sockaddr_in6) &&
167 usin->sin6_scope_id) {
168 /* If interface is set while binding, indices
169 * must coincide.
170 */
171 if (sk->sk_bound_dev_if &&
172 sk->sk_bound_dev_if != usin->sin6_scope_id)
173 return -EINVAL;
174
175 sk->sk_bound_dev_if = usin->sin6_scope_id;
176 }
177
178 /* Connect to link-local address requires an interface */
179 if (!sk->sk_bound_dev_if)
180 return -EINVAL;
181 }
182
183 if (tp->rx_opt.ts_recent_stamp &&
184 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
185 tp->rx_opt.ts_recent = 0;
186 tp->rx_opt.ts_recent_stamp = 0;
187 tp->write_seq = 0;
188 }
189
190 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
191 np->flow_label = fl.fl6_flowlabel;
192
193 /*
194 * TCP over IPv4
195 */
196
197 if (addr_type == IPV6_ADDR_MAPPED) {
198 u32 exthdrlen = icsk->icsk_ext_hdr_len;
199 struct sockaddr_in sin;
200
201 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
202
203 if (__ipv6_only_sock(sk))
204 return -ENETUNREACH;
205
206 sin.sin_family = AF_INET;
207 sin.sin_port = usin->sin6_port;
208 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
209
210 icsk->icsk_af_ops = &ipv6_mapped;
211 sk->sk_backlog_rcv = tcp_v4_do_rcv;
212 #ifdef CONFIG_TCP_MD5SIG
213 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
214 #endif
215
216 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
217
218 if (err) {
219 icsk->icsk_ext_hdr_len = exthdrlen;
220 icsk->icsk_af_ops = &ipv6_specific;
221 sk->sk_backlog_rcv = tcp_v6_do_rcv;
222 #ifdef CONFIG_TCP_MD5SIG
223 tp->af_specific = &tcp_sock_ipv6_specific;
224 #endif
225 goto failure;
226 } else {
227 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
228 inet->saddr);
229 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
230 inet->rcv_saddr);
231 }
232
233 return err;
234 }
235
236 if (!ipv6_addr_any(&np->rcv_saddr))
237 saddr = &np->rcv_saddr;
238
239 fl.proto = IPPROTO_TCP;
240 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
241 ipv6_addr_copy(&fl.fl6_src,
242 (saddr ? saddr : &np->saddr));
243 fl.oif = sk->sk_bound_dev_if;
244 fl.fl_ip_dport = usin->sin6_port;
245 fl.fl_ip_sport = inet->sport;
246
247 if (np->opt && np->opt->srcrt) {
248 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
249 ipv6_addr_copy(&final, &fl.fl6_dst);
250 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
251 final_p = &final;
252 }
253
254 security_sk_classify_flow(sk, &fl);
255
256 err = ip6_dst_lookup(sk, &dst, &fl);
257 if (err)
258 goto failure;
259 if (final_p)
260 ipv6_addr_copy(&fl.fl6_dst, final_p);
261
262 if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) {
263 if (err == -EREMOTE)
264 err = ip6_dst_blackhole(sk, &dst, &fl);
265 if (err < 0)
266 goto failure;
267 }
268
269 if (saddr == NULL) {
270 saddr = &fl.fl6_src;
271 ipv6_addr_copy(&np->rcv_saddr, saddr);
272 }
273
274 /* set the source address */
275 ipv6_addr_copy(&np->saddr, saddr);
276 inet->rcv_saddr = LOOPBACK4_IPV6;
277
278 sk->sk_gso_type = SKB_GSO_TCPV6;
279 __ip6_dst_store(sk, dst, NULL, NULL);
280
281 icsk->icsk_ext_hdr_len = 0;
282 if (np->opt)
283 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
284 np->opt->opt_nflen);
285
286 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
287
288 inet->dport = usin->sin6_port;
289
290 tcp_set_state(sk, TCP_SYN_SENT);
291 err = inet6_hash_connect(&tcp_death_row, sk);
292 if (err)
293 goto late_failure;
294
295 if (!tp->write_seq)
296 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
297 np->daddr.s6_addr32,
298 inet->sport,
299 inet->dport);
300
301 err = tcp_connect(sk);
302 if (err)
303 goto late_failure;
304
305 return 0;
306
307 late_failure:
308 tcp_set_state(sk, TCP_CLOSE);
309 __sk_dst_reset(sk);
310 failure:
311 inet->dport = 0;
312 sk->sk_route_caps = 0;
313 return err;
314 }
315
316 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
317 int type, int code, int offset, __be32 info)
318 {
319 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
320 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
321 struct ipv6_pinfo *np;
322 struct sock *sk;
323 int err;
324 struct tcp_sock *tp;
325 __u32 seq;
326 struct net *net = dev_net(skb->dev);
327
328 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
329 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
330
331 if (sk == NULL) {
332 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
333 return;
334 }
335
336 if (sk->sk_state == TCP_TIME_WAIT) {
337 inet_twsk_put(inet_twsk(sk));
338 return;
339 }
340
341 bh_lock_sock(sk);
342 if (sock_owned_by_user(sk))
343 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
344
345 if (sk->sk_state == TCP_CLOSE)
346 goto out;
347
348 tp = tcp_sk(sk);
349 seq = ntohl(th->seq);
350 if (sk->sk_state != TCP_LISTEN &&
351 !between(seq, tp->snd_una, tp->snd_nxt)) {
352 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
353 goto out;
354 }
355
356 np = inet6_sk(sk);
357
358 if (type == ICMPV6_PKT_TOOBIG) {
359 struct dst_entry *dst = NULL;
360
361 if (sock_owned_by_user(sk))
362 goto out;
363 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
364 goto out;
365
366 /* icmp should have updated the destination cache entry */
367 dst = __sk_dst_check(sk, np->dst_cookie);
368
369 if (dst == NULL) {
370 struct inet_sock *inet = inet_sk(sk);
371 struct flowi fl;
372
373 /* BUGGG_FUTURE: Again, it is not clear how
374 to handle rthdr case. Ignore this complexity
375 for now.
376 */
377 memset(&fl, 0, sizeof(fl));
378 fl.proto = IPPROTO_TCP;
379 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
380 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
381 fl.oif = sk->sk_bound_dev_if;
382 fl.fl_ip_dport = inet->dport;
383 fl.fl_ip_sport = inet->sport;
384 security_skb_classify_flow(skb, &fl);
385
386 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
387 sk->sk_err_soft = -err;
388 goto out;
389 }
390
391 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
392 sk->sk_err_soft = -err;
393 goto out;
394 }
395
396 } else
397 dst_hold(dst);
398
399 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
400 tcp_sync_mss(sk, dst_mtu(dst));
401 tcp_simple_retransmit(sk);
402 } /* else let the usual retransmit timer handle it */
403 dst_release(dst);
404 goto out;
405 }
406
407 icmpv6_err_convert(type, code, &err);
408
409 /* Might be for an request_sock */
410 switch (sk->sk_state) {
411 struct request_sock *req, **prev;
412 case TCP_LISTEN:
413 if (sock_owned_by_user(sk))
414 goto out;
415
416 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
417 &hdr->saddr, inet6_iif(skb));
418 if (!req)
419 goto out;
420
421 /* ICMPs are not backlogged, hence we cannot get
422 * an established socket here.
423 */
424 BUG_TRAP(req->sk == NULL);
425
426 if (seq != tcp_rsk(req)->snt_isn) {
427 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
428 goto out;
429 }
430
431 inet_csk_reqsk_queue_drop(sk, req, prev);
432 goto out;
433
434 case TCP_SYN_SENT:
435 case TCP_SYN_RECV: /* Cannot happen.
436 It can, it SYNs are crossed. --ANK */
437 if (!sock_owned_by_user(sk)) {
438 sk->sk_err = err;
439 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
440
441 tcp_done(sk);
442 } else
443 sk->sk_err_soft = err;
444 goto out;
445 }
446
447 if (!sock_owned_by_user(sk) && np->recverr) {
448 sk->sk_err = err;
449 sk->sk_error_report(sk);
450 } else
451 sk->sk_err_soft = err;
452
453 out:
454 bh_unlock_sock(sk);
455 sock_put(sk);
456 }
457
458
459 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
460 {
461 struct inet6_request_sock *treq = inet6_rsk(req);
462 struct ipv6_pinfo *np = inet6_sk(sk);
463 struct sk_buff * skb;
464 struct ipv6_txoptions *opt = NULL;
465 struct in6_addr * final_p = NULL, final;
466 struct flowi fl;
467 struct dst_entry *dst;
468 int err = -1;
469
470 memset(&fl, 0, sizeof(fl));
471 fl.proto = IPPROTO_TCP;
472 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
473 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
474 fl.fl6_flowlabel = 0;
475 fl.oif = treq->iif;
476 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
477 fl.fl_ip_sport = inet_sk(sk)->sport;
478 security_req_classify_flow(req, &fl);
479
480 opt = np->opt;
481 if (opt && opt->srcrt) {
482 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
483 ipv6_addr_copy(&final, &fl.fl6_dst);
484 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
485 final_p = &final;
486 }
487
488 err = ip6_dst_lookup(sk, &dst, &fl);
489 if (err)
490 goto done;
491 if (final_p)
492 ipv6_addr_copy(&fl.fl6_dst, final_p);
493 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
494 goto done;
495
496 skb = tcp_make_synack(sk, dst, req);
497 if (skb) {
498 struct tcphdr *th = tcp_hdr(skb);
499
500 th->check = tcp_v6_check(th, skb->len,
501 &treq->loc_addr, &treq->rmt_addr,
502 csum_partial((char *)th, skb->len, skb->csum));
503
504 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
505 err = ip6_xmit(sk, skb, &fl, opt, 0);
506 err = net_xmit_eval(err);
507 }
508
509 done:
510 if (opt && opt != np->opt)
511 sock_kfree_s(sk, opt, opt->tot_len);
512 dst_release(dst);
513 return err;
514 }
515
516 static inline void syn_flood_warning(struct sk_buff *skb)
517 {
518 #ifdef CONFIG_SYN_COOKIES
519 if (sysctl_tcp_syncookies)
520 printk(KERN_INFO
521 "TCPv6: Possible SYN flooding on port %d. "
522 "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
523 else
524 #endif
525 printk(KERN_INFO
526 "TCPv6: Possible SYN flooding on port %d. "
527 "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
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_equal(&tp->md5sig_info->keys6[i].addr, addr))
550 return &tp->md5sig_info->keys6[i].base;
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 tcp_md5sig_key *key;
572 struct tcp_sock *tp = tcp_sk(sk);
573 struct tcp6_md5sig_key *keys;
574
575 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 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
590 }
591 if (tcp_alloc_md5sig_pool() == NULL) {
592 kfree(newkey);
593 return -ENOMEM;
594 }
595 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
596 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
597 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
598
599 if (!keys) {
600 tcp_free_md5sig_pool();
601 kfree(newkey);
602 return -ENOMEM;
603 }
604
605 if (tp->md5sig_info->entries6)
606 memmove(keys, tp->md5sig_info->keys6,
607 (sizeof (tp->md5sig_info->keys6[0]) *
608 tp->md5sig_info->entries6));
609
610 kfree(tp->md5sig_info->keys6);
611 tp->md5sig_info->keys6 = keys;
612 tp->md5sig_info->alloced6++;
613 }
614
615 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
616 peer);
617 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
618 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
619
620 tp->md5sig_info->entries6++;
621 }
622 return 0;
623 }
624
625 static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
626 u8 *newkey, __u8 newkeylen)
627 {
628 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
629 newkey, newkeylen);
630 }
631
632 static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
633 {
634 struct tcp_sock *tp = tcp_sk(sk);
635 int i;
636
637 for (i = 0; i < tp->md5sig_info->entries6; i++) {
638 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
639 /* Free the key */
640 kfree(tp->md5sig_info->keys6[i].base.key);
641 tp->md5sig_info->entries6--;
642
643 if (tp->md5sig_info->entries6 == 0) {
644 kfree(tp->md5sig_info->keys6);
645 tp->md5sig_info->keys6 = NULL;
646 tp->md5sig_info->alloced6 = 0;
647 } else {
648 /* shrink the database */
649 if (tp->md5sig_info->entries6 != i)
650 memmove(&tp->md5sig_info->keys6[i],
651 &tp->md5sig_info->keys6[i+1],
652 (tp->md5sig_info->entries6 - i)
653 * sizeof (tp->md5sig_info->keys6[0]));
654 }
655 tcp_free_md5sig_pool();
656 return 0;
657 }
658 }
659 return -ENOENT;
660 }
661
662 static void tcp_v6_clear_md5_list (struct sock *sk)
663 {
664 struct tcp_sock *tp = tcp_sk(sk);
665 int i;
666
667 if (tp->md5sig_info->entries6) {
668 for (i = 0; i < tp->md5sig_info->entries6; i++)
669 kfree(tp->md5sig_info->keys6[i].base.key);
670 tp->md5sig_info->entries6 = 0;
671 tcp_free_md5sig_pool();
672 }
673
674 kfree(tp->md5sig_info->keys6);
675 tp->md5sig_info->keys6 = NULL;
676 tp->md5sig_info->alloced6 = 0;
677
678 if (tp->md5sig_info->entries4) {
679 for (i = 0; i < tp->md5sig_info->entries4; i++)
680 kfree(tp->md5sig_info->keys4[i].base.key);
681 tp->md5sig_info->entries4 = 0;
682 tcp_free_md5sig_pool();
683 }
684
685 kfree(tp->md5sig_info->keys4);
686 tp->md5sig_info->keys4 = NULL;
687 tp->md5sig_info->alloced4 = 0;
688 }
689
690 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
691 int optlen)
692 {
693 struct tcp_md5sig cmd;
694 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
695 u8 *newkey;
696
697 if (optlen < sizeof(cmd))
698 return -EINVAL;
699
700 if (copy_from_user(&cmd, optval, sizeof(cmd)))
701 return -EFAULT;
702
703 if (sin6->sin6_family != AF_INET6)
704 return -EINVAL;
705
706 if (!cmd.tcpm_keylen) {
707 if (!tcp_sk(sk)->md5sig_info)
708 return -ENOENT;
709 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
710 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
711 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
712 }
713
714 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
715 return -EINVAL;
716
717 if (!tcp_sk(sk)->md5sig_info) {
718 struct tcp_sock *tp = tcp_sk(sk);
719 struct tcp_md5sig_info *p;
720
721 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
722 if (!p)
723 return -ENOMEM;
724
725 tp->md5sig_info = p;
726 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
727 }
728
729 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
730 if (!newkey)
731 return -ENOMEM;
732 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
733 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
734 newkey, cmd.tcpm_keylen);
735 }
736 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
737 }
738
739 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
740 struct in6_addr *daddr,
741 struct in6_addr *saddr, int nbytes)
742 {
743 struct tcp6_pseudohdr *bp;
744 struct scatterlist sg;
745
746 bp = &hp->md5_blk.ip6;
747 /* 1. TCP pseudo-header (RFC2460) */
748 ipv6_addr_copy(&bp->saddr, saddr);
749 ipv6_addr_copy(&bp->daddr, daddr);
750 bp->protocol = cpu_to_be32(IPPROTO_TCP);
751 bp->len = cpu_to_be16(nbytes);
752
753 sg_init_one(&sg, bp, sizeof(*bp));
754 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
755 }
756
757 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
758 struct in6_addr *daddr, struct in6_addr *saddr,
759 struct tcphdr *th)
760 {
761 struct tcp_md5sig_pool *hp;
762 struct hash_desc *desc;
763
764 hp = tcp_get_md5sig_pool();
765 if (!hp)
766 goto clear_hash_noput;
767 desc = &hp->md5_desc;
768
769 if (crypto_hash_init(desc))
770 goto clear_hash;
771 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
772 goto clear_hash;
773 if (tcp_md5_hash_header(hp, th))
774 goto clear_hash;
775 if (tcp_md5_hash_key(hp, key))
776 goto clear_hash;
777 if (crypto_hash_final(desc, md5_hash))
778 goto clear_hash;
779
780 tcp_put_md5sig_pool();
781 return 0;
782
783 clear_hash:
784 tcp_put_md5sig_pool();
785 clear_hash_noput:
786 memset(md5_hash, 0, 16);
787 return 1;
788 }
789
790 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
791 struct sock *sk, struct request_sock *req,
792 struct sk_buff *skb)
793 {
794 struct in6_addr *saddr, *daddr;
795 struct tcp_md5sig_pool *hp;
796 struct hash_desc *desc;
797 struct tcphdr *th = tcp_hdr(skb);
798
799 if (sk) {
800 saddr = &inet6_sk(sk)->saddr;
801 daddr = &inet6_sk(sk)->daddr;
802 } else if (req) {
803 saddr = &inet6_rsk(req)->loc_addr;
804 daddr = &inet6_rsk(req)->rmt_addr;
805 } else {
806 struct ipv6hdr *ip6h = ipv6_hdr(skb);
807 saddr = &ip6h->saddr;
808 daddr = &ip6h->daddr;
809 }
810
811 hp = tcp_get_md5sig_pool();
812 if (!hp)
813 goto clear_hash_noput;
814 desc = &hp->md5_desc;
815
816 if (crypto_hash_init(desc))
817 goto clear_hash;
818
819 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
820 goto clear_hash;
821 if (tcp_md5_hash_header(hp, th))
822 goto clear_hash;
823 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
824 goto clear_hash;
825 if (tcp_md5_hash_key(hp, key))
826 goto clear_hash;
827 if (crypto_hash_final(desc, md5_hash))
828 goto clear_hash;
829
830 tcp_put_md5sig_pool();
831 return 0;
832
833 clear_hash:
834 tcp_put_md5sig_pool();
835 clear_hash_noput:
836 memset(md5_hash, 0, 16);
837 return 1;
838 }
839
840 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
841 {
842 __u8 *hash_location = NULL;
843 struct tcp_md5sig_key *hash_expected;
844 struct ipv6hdr *ip6h = ipv6_hdr(skb);
845 struct tcphdr *th = tcp_hdr(skb);
846 int genhash;
847 u8 newhash[16];
848
849 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
850 hash_location = tcp_parse_md5sig_option(th);
851
852 /* do we have a hash as expected? */
853 if (!hash_expected) {
854 if (!hash_location)
855 return 0;
856 if (net_ratelimit()) {
857 printk(KERN_INFO "MD5 Hash NOT expected but found "
858 "(" NIP6_FMT ", %u)->"
859 "(" NIP6_FMT ", %u)\n",
860 NIP6(ip6h->saddr), ntohs(th->source),
861 NIP6(ip6h->daddr), ntohs(th->dest));
862 }
863 return 1;
864 }
865
866 if (!hash_location) {
867 if (net_ratelimit()) {
868 printk(KERN_INFO "MD5 Hash expected but NOT found "
869 "(" NIP6_FMT ", %u)->"
870 "(" NIP6_FMT ", %u)\n",
871 NIP6(ip6h->saddr), ntohs(th->source),
872 NIP6(ip6h->daddr), ntohs(th->dest));
873 }
874 return 1;
875 }
876
877 /* check the signature */
878 genhash = tcp_v6_md5_hash_skb(newhash,
879 hash_expected,
880 NULL, NULL, skb);
881
882 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
883 if (net_ratelimit()) {
884 printk(KERN_INFO "MD5 Hash %s for "
885 "(" NIP6_FMT ", %u)->"
886 "(" NIP6_FMT ", %u)\n",
887 genhash ? "failed" : "mismatch",
888 NIP6(ip6h->saddr), ntohs(th->source),
889 NIP6(ip6h->daddr), ntohs(th->dest));
890 }
891 return 1;
892 }
893 return 0;
894 }
895 #endif
896
897 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
898 .family = AF_INET6,
899 .obj_size = sizeof(struct tcp6_request_sock),
900 .rtx_syn_ack = tcp_v6_send_synack,
901 .send_ack = tcp_v6_reqsk_send_ack,
902 .destructor = tcp_v6_reqsk_destructor,
903 .send_reset = tcp_v6_send_reset
904 };
905
906 #ifdef CONFIG_TCP_MD5SIG
907 static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
908 .md5_lookup = tcp_v6_reqsk_md5_lookup,
909 };
910 #endif
911
912 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
913 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
914 .twsk_unique = tcp_twsk_unique,
915 .twsk_destructor= tcp_twsk_destructor,
916 };
917
918 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
919 {
920 struct ipv6_pinfo *np = inet6_sk(sk);
921 struct tcphdr *th = tcp_hdr(skb);
922
923 if (skb->ip_summed == CHECKSUM_PARTIAL) {
924 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
925 skb->csum_start = skb_transport_header(skb) - skb->head;
926 skb->csum_offset = offsetof(struct tcphdr, check);
927 } else {
928 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
929 csum_partial((char *)th, th->doff<<2,
930 skb->csum));
931 }
932 }
933
934 static int tcp_v6_gso_send_check(struct sk_buff *skb)
935 {
936 struct ipv6hdr *ipv6h;
937 struct tcphdr *th;
938
939 if (!pskb_may_pull(skb, sizeof(*th)))
940 return -EINVAL;
941
942 ipv6h = ipv6_hdr(skb);
943 th = tcp_hdr(skb);
944
945 th->check = 0;
946 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
947 IPPROTO_TCP, 0);
948 skb->csum_start = skb_transport_header(skb) - skb->head;
949 skb->csum_offset = offsetof(struct tcphdr, check);
950 skb->ip_summed = CHECKSUM_PARTIAL;
951 return 0;
952 }
953
954 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
955 {
956 struct tcphdr *th = tcp_hdr(skb), *t1;
957 struct sk_buff *buff;
958 struct flowi fl;
959 struct net *net = dev_net(skb->dst->dev);
960 struct sock *ctl_sk = net->ipv6.tcp_sk;
961 unsigned int tot_len = sizeof(*th);
962 #ifdef CONFIG_TCP_MD5SIG
963 struct tcp_md5sig_key *key;
964 #endif
965
966 if (th->rst)
967 return;
968
969 if (!ipv6_unicast_destination(skb))
970 return;
971
972 #ifdef CONFIG_TCP_MD5SIG
973 if (sk)
974 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
975 else
976 key = NULL;
977
978 if (key)
979 tot_len += TCPOLEN_MD5SIG_ALIGNED;
980 #endif
981
982 /*
983 * We need to grab some memory, and put together an RST,
984 * and then put it into the queue to be sent.
985 */
986
987 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
988 GFP_ATOMIC);
989 if (buff == NULL)
990 return;
991
992 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
993
994 t1 = (struct tcphdr *) skb_push(buff, tot_len);
995
996 /* Swap the send and the receive. */
997 memset(t1, 0, sizeof(*t1));
998 t1->dest = th->source;
999 t1->source = th->dest;
1000 t1->doff = tot_len / 4;
1001 t1->rst = 1;
1002
1003 if(th->ack) {
1004 t1->seq = th->ack_seq;
1005 } else {
1006 t1->ack = 1;
1007 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
1008 + skb->len - (th->doff<<2));
1009 }
1010
1011 #ifdef CONFIG_TCP_MD5SIG
1012 if (key) {
1013 __be32 *opt = (__be32*)(t1 + 1);
1014 opt[0] = htonl((TCPOPT_NOP << 24) |
1015 (TCPOPT_NOP << 16) |
1016 (TCPOPT_MD5SIG << 8) |
1017 TCPOLEN_MD5SIG);
1018 tcp_v6_md5_hash_hdr((__u8 *)&opt[1], key,
1019 &ipv6_hdr(skb)->daddr,
1020 &ipv6_hdr(skb)->saddr, t1);
1021 }
1022 #endif
1023
1024 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
1025
1026 memset(&fl, 0, sizeof(fl));
1027 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1028 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1029
1030 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1031 sizeof(*t1), IPPROTO_TCP,
1032 buff->csum);
1033
1034 fl.proto = IPPROTO_TCP;
1035 fl.oif = inet6_iif(skb);
1036 fl.fl_ip_dport = t1->dest;
1037 fl.fl_ip_sport = t1->source;
1038 security_skb_classify_flow(skb, &fl);
1039
1040 /* Pass a socket to ip6_dst_lookup either it is for RST
1041 * Underlying function will use this to retrieve the network
1042 * namespace
1043 */
1044 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1045
1046 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1047 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1048 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1049 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1050 return;
1051 }
1052 }
1053
1054 kfree_skb(buff);
1055 }
1056
1057 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1058 struct tcp_md5sig_key *key)
1059 {
1060 struct tcphdr *th = tcp_hdr(skb), *t1;
1061 struct sk_buff *buff;
1062 struct flowi fl;
1063 struct net *net = dev_net(skb->dev);
1064 struct sock *ctl_sk = net->ipv6.tcp_sk;
1065 unsigned int tot_len = sizeof(struct tcphdr);
1066 __be32 *topt;
1067
1068 if (ts)
1069 tot_len += TCPOLEN_TSTAMP_ALIGNED;
1070 #ifdef CONFIG_TCP_MD5SIG
1071 if (key)
1072 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1073 #endif
1074
1075 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1076 GFP_ATOMIC);
1077 if (buff == NULL)
1078 return;
1079
1080 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1081
1082 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1083
1084 /* Swap the send and the receive. */
1085 memset(t1, 0, sizeof(*t1));
1086 t1->dest = th->source;
1087 t1->source = th->dest;
1088 t1->doff = tot_len/4;
1089 t1->seq = htonl(seq);
1090 t1->ack_seq = htonl(ack);
1091 t1->ack = 1;
1092 t1->window = htons(win);
1093
1094 topt = (__be32 *)(t1 + 1);
1095
1096 if (ts) {
1097 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1098 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1099 *topt++ = htonl(tcp_time_stamp);
1100 *topt = htonl(ts);
1101 }
1102
1103 #ifdef CONFIG_TCP_MD5SIG
1104 if (key) {
1105 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1106 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1107 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1108 &ipv6_hdr(skb)->daddr,
1109 &ipv6_hdr(skb)->saddr, t1);
1110 }
1111 #endif
1112
1113 buff->csum = csum_partial((char *)t1, tot_len, 0);
1114
1115 memset(&fl, 0, sizeof(fl));
1116 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1117 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1118
1119 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1120 tot_len, IPPROTO_TCP,
1121 buff->csum);
1122
1123 fl.proto = IPPROTO_TCP;
1124 fl.oif = inet6_iif(skb);
1125 fl.fl_ip_dport = t1->dest;
1126 fl.fl_ip_sport = t1->source;
1127 security_skb_classify_flow(skb, &fl);
1128
1129 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1130 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1131 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1132 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1133 return;
1134 }
1135 }
1136
1137 kfree_skb(buff);
1138 }
1139
1140 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1141 {
1142 struct inet_timewait_sock *tw = inet_twsk(sk);
1143 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1144
1145 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1146 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1147 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
1148
1149 inet_twsk_put(tw);
1150 }
1151
1152 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
1153 {
1154 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1155 tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr));
1156 }
1157
1158
1159 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1160 {
1161 struct request_sock *req, **prev;
1162 const struct tcphdr *th = tcp_hdr(skb);
1163 struct sock *nsk;
1164
1165 /* Find possible connection requests. */
1166 req = inet6_csk_search_req(sk, &prev, th->source,
1167 &ipv6_hdr(skb)->saddr,
1168 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1169 if (req)
1170 return tcp_check_req(sk, skb, req, prev);
1171
1172 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1173 &ipv6_hdr(skb)->saddr, th->source,
1174 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1175
1176 if (nsk) {
1177 if (nsk->sk_state != TCP_TIME_WAIT) {
1178 bh_lock_sock(nsk);
1179 return nsk;
1180 }
1181 inet_twsk_put(inet_twsk(nsk));
1182 return NULL;
1183 }
1184
1185 #ifdef CONFIG_SYN_COOKIES
1186 if (!th->rst && !th->syn && th->ack)
1187 sk = cookie_v6_check(sk, skb);
1188 #endif
1189 return sk;
1190 }
1191
1192 /* FIXME: this is substantially similar to the ipv4 code.
1193 * Can some kind of merge be done? -- erics
1194 */
1195 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1196 {
1197 struct inet6_request_sock *treq;
1198 struct ipv6_pinfo *np = inet6_sk(sk);
1199 struct tcp_options_received tmp_opt;
1200 struct tcp_sock *tp = tcp_sk(sk);
1201 struct request_sock *req = NULL;
1202 __u32 isn = TCP_SKB_CB(skb)->when;
1203 #ifdef CONFIG_SYN_COOKIES
1204 int want_cookie = 0;
1205 #else
1206 #define want_cookie 0
1207 #endif
1208
1209 if (skb->protocol == htons(ETH_P_IP))
1210 return tcp_v4_conn_request(sk, skb);
1211
1212 if (!ipv6_unicast_destination(skb))
1213 goto drop;
1214
1215 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1216 if (net_ratelimit())
1217 syn_flood_warning(skb);
1218 #ifdef CONFIG_SYN_COOKIES
1219 if (sysctl_tcp_syncookies)
1220 want_cookie = 1;
1221 else
1222 #endif
1223 goto drop;
1224 }
1225
1226 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1227 goto drop;
1228
1229 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1230 if (req == NULL)
1231 goto drop;
1232
1233 #ifdef CONFIG_TCP_MD5SIG
1234 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1235 #endif
1236
1237 tcp_clear_options(&tmp_opt);
1238 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1239 tmp_opt.user_mss = tp->rx_opt.user_mss;
1240
1241 tcp_parse_options(skb, &tmp_opt, 0);
1242
1243 if (want_cookie && !tmp_opt.saw_tstamp)
1244 tcp_clear_options(&tmp_opt);
1245
1246 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1247 tcp_openreq_init(req, &tmp_opt, skb);
1248
1249 treq = inet6_rsk(req);
1250 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1251 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1252 if (!want_cookie)
1253 TCP_ECN_create_request(req, tcp_hdr(skb));
1254
1255 if (want_cookie) {
1256 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1257 req->cookie_ts = tmp_opt.tstamp_ok;
1258 } else if (!isn) {
1259 if (ipv6_opt_accepted(sk, skb) ||
1260 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1261 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1262 atomic_inc(&skb->users);
1263 treq->pktopts = skb;
1264 }
1265 treq->iif = sk->sk_bound_dev_if;
1266
1267 /* So that link locals have meaning */
1268 if (!sk->sk_bound_dev_if &&
1269 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1270 treq->iif = inet6_iif(skb);
1271
1272 isn = tcp_v6_init_sequence(skb);
1273 }
1274
1275 tcp_rsk(req)->snt_isn = isn;
1276
1277 security_inet_conn_request(sk, skb, req);
1278
1279 if (tcp_v6_send_synack(sk, req))
1280 goto drop;
1281
1282 if (!want_cookie) {
1283 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1284 return 0;
1285 }
1286
1287 drop:
1288 if (req)
1289 reqsk_free(req);
1290
1291 return 0; /* don't send reset */
1292 }
1293
1294 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1295 struct request_sock *req,
1296 struct dst_entry *dst)
1297 {
1298 struct inet6_request_sock *treq = inet6_rsk(req);
1299 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1300 struct tcp6_sock *newtcp6sk;
1301 struct inet_sock *newinet;
1302 struct tcp_sock *newtp;
1303 struct sock *newsk;
1304 struct ipv6_txoptions *opt;
1305 #ifdef CONFIG_TCP_MD5SIG
1306 struct tcp_md5sig_key *key;
1307 #endif
1308
1309 if (skb->protocol == htons(ETH_P_IP)) {
1310 /*
1311 * v6 mapped
1312 */
1313
1314 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1315
1316 if (newsk == NULL)
1317 return NULL;
1318
1319 newtcp6sk = (struct tcp6_sock *)newsk;
1320 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1321
1322 newinet = inet_sk(newsk);
1323 newnp = inet6_sk(newsk);
1324 newtp = tcp_sk(newsk);
1325
1326 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1327
1328 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1329 newinet->daddr);
1330
1331 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1332 newinet->saddr);
1333
1334 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1335
1336 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1337 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1338 #ifdef CONFIG_TCP_MD5SIG
1339 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1340 #endif
1341
1342 newnp->pktoptions = NULL;
1343 newnp->opt = NULL;
1344 newnp->mcast_oif = inet6_iif(skb);
1345 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1346
1347 /*
1348 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1349 * here, tcp_create_openreq_child now does this for us, see the comment in
1350 * that function for the gory details. -acme
1351 */
1352
1353 /* It is tricky place. Until this moment IPv4 tcp
1354 worked with IPv6 icsk.icsk_af_ops.
1355 Sync it now.
1356 */
1357 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1358
1359 return newsk;
1360 }
1361
1362 opt = np->opt;
1363
1364 if (sk_acceptq_is_full(sk))
1365 goto out_overflow;
1366
1367 if (dst == NULL) {
1368 struct in6_addr *final_p = NULL, final;
1369 struct flowi fl;
1370
1371 memset(&fl, 0, sizeof(fl));
1372 fl.proto = IPPROTO_TCP;
1373 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1374 if (opt && opt->srcrt) {
1375 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1376 ipv6_addr_copy(&final, &fl.fl6_dst);
1377 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1378 final_p = &final;
1379 }
1380 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1381 fl.oif = sk->sk_bound_dev_if;
1382 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1383 fl.fl_ip_sport = inet_sk(sk)->sport;
1384 security_req_classify_flow(req, &fl);
1385
1386 if (ip6_dst_lookup(sk, &dst, &fl))
1387 goto out;
1388
1389 if (final_p)
1390 ipv6_addr_copy(&fl.fl6_dst, final_p);
1391
1392 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1393 goto out;
1394 }
1395
1396 newsk = tcp_create_openreq_child(sk, req, skb);
1397 if (newsk == NULL)
1398 goto out;
1399
1400 /*
1401 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1402 * count here, tcp_create_openreq_child now does this for us, see the
1403 * comment in that function for the gory details. -acme
1404 */
1405
1406 newsk->sk_gso_type = SKB_GSO_TCPV6;
1407 __ip6_dst_store(newsk, dst, NULL, NULL);
1408
1409 newtcp6sk = (struct tcp6_sock *)newsk;
1410 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1411
1412 newtp = tcp_sk(newsk);
1413 newinet = inet_sk(newsk);
1414 newnp = inet6_sk(newsk);
1415
1416 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1417
1418 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1419 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1420 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1421 newsk->sk_bound_dev_if = treq->iif;
1422
1423 /* Now IPv6 options...
1424
1425 First: no IPv4 options.
1426 */
1427 newinet->opt = NULL;
1428 newnp->ipv6_fl_list = NULL;
1429
1430 /* Clone RX bits */
1431 newnp->rxopt.all = np->rxopt.all;
1432
1433 /* Clone pktoptions received with SYN */
1434 newnp->pktoptions = NULL;
1435 if (treq->pktopts != NULL) {
1436 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1437 kfree_skb(treq->pktopts);
1438 treq->pktopts = NULL;
1439 if (newnp->pktoptions)
1440 skb_set_owner_r(newnp->pktoptions, newsk);
1441 }
1442 newnp->opt = NULL;
1443 newnp->mcast_oif = inet6_iif(skb);
1444 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1445
1446 /* Clone native IPv6 options from listening socket (if any)
1447
1448 Yes, keeping reference count would be much more clever,
1449 but we make one more one thing there: reattach optmem
1450 to newsk.
1451 */
1452 if (opt) {
1453 newnp->opt = ipv6_dup_options(newsk, opt);
1454 if (opt != np->opt)
1455 sock_kfree_s(sk, opt, opt->tot_len);
1456 }
1457
1458 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1459 if (newnp->opt)
1460 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1461 newnp->opt->opt_flen);
1462
1463 tcp_mtup_init(newsk);
1464 tcp_sync_mss(newsk, dst_mtu(dst));
1465 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1466 tcp_initialize_rcv_mss(newsk);
1467
1468 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1469
1470 #ifdef CONFIG_TCP_MD5SIG
1471 /* Copy over the MD5 key from the original socket */
1472 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1473 /* We're using one, so create a matching key
1474 * on the newsk structure. If we fail to get
1475 * memory, then we end up not copying the key
1476 * across. Shucks.
1477 */
1478 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1479 if (newkey != NULL)
1480 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1481 newkey, key->keylen);
1482 }
1483 #endif
1484
1485 __inet6_hash(newsk);
1486 __inet_inherit_port(sk, newsk);
1487
1488 return newsk;
1489
1490 out_overflow:
1491 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1492 out:
1493 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1494 if (opt && opt != np->opt)
1495 sock_kfree_s(sk, opt, opt->tot_len);
1496 dst_release(dst);
1497 return NULL;
1498 }
1499
1500 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1501 {
1502 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1503 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1504 &ipv6_hdr(skb)->daddr, skb->csum)) {
1505 skb->ip_summed = CHECKSUM_UNNECESSARY;
1506 return 0;
1507 }
1508 }
1509
1510 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1511 &ipv6_hdr(skb)->saddr,
1512 &ipv6_hdr(skb)->daddr, 0));
1513
1514 if (skb->len <= 76) {
1515 return __skb_checksum_complete(skb);
1516 }
1517 return 0;
1518 }
1519
1520 /* The socket must have it's spinlock held when we get
1521 * here.
1522 *
1523 * We have a potential double-lock case here, so even when
1524 * doing backlog processing we use the BH locking scheme.
1525 * This is because we cannot sleep with the original spinlock
1526 * held.
1527 */
1528 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1529 {
1530 struct ipv6_pinfo *np = inet6_sk(sk);
1531 struct tcp_sock *tp;
1532 struct sk_buff *opt_skb = NULL;
1533
1534 /* Imagine: socket is IPv6. IPv4 packet arrives,
1535 goes to IPv4 receive handler and backlogged.
1536 From backlog it always goes here. Kerboom...
1537 Fortunately, tcp_rcv_established and rcv_established
1538 handle them correctly, but it is not case with
1539 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1540 */
1541
1542 if (skb->protocol == htons(ETH_P_IP))
1543 return tcp_v4_do_rcv(sk, skb);
1544
1545 #ifdef CONFIG_TCP_MD5SIG
1546 if (tcp_v6_inbound_md5_hash (sk, skb))
1547 goto discard;
1548 #endif
1549
1550 if (sk_filter(sk, skb))
1551 goto discard;
1552
1553 /*
1554 * socket locking is here for SMP purposes as backlog rcv
1555 * is currently called with bh processing disabled.
1556 */
1557
1558 /* Do Stevens' IPV6_PKTOPTIONS.
1559
1560 Yes, guys, it is the only place in our code, where we
1561 may make it not affecting IPv4.
1562 The rest of code is protocol independent,
1563 and I do not like idea to uglify IPv4.
1564
1565 Actually, all the idea behind IPV6_PKTOPTIONS
1566 looks not very well thought. For now we latch
1567 options, received in the last packet, enqueued
1568 by tcp. Feel free to propose better solution.
1569 --ANK (980728)
1570 */
1571 if (np->rxopt.all)
1572 opt_skb = skb_clone(skb, GFP_ATOMIC);
1573
1574 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1575 TCP_CHECK_TIMER(sk);
1576 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1577 goto reset;
1578 TCP_CHECK_TIMER(sk);
1579 if (opt_skb)
1580 goto ipv6_pktoptions;
1581 return 0;
1582 }
1583
1584 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1585 goto csum_err;
1586
1587 if (sk->sk_state == TCP_LISTEN) {
1588 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1589 if (!nsk)
1590 goto discard;
1591
1592 /*
1593 * Queue it on the new socket if the new socket is active,
1594 * otherwise we just shortcircuit this and continue with
1595 * the new socket..
1596 */
1597 if(nsk != sk) {
1598 if (tcp_child_process(sk, nsk, skb))
1599 goto reset;
1600 if (opt_skb)
1601 __kfree_skb(opt_skb);
1602 return 0;
1603 }
1604 }
1605
1606 TCP_CHECK_TIMER(sk);
1607 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1608 goto reset;
1609 TCP_CHECK_TIMER(sk);
1610 if (opt_skb)
1611 goto ipv6_pktoptions;
1612 return 0;
1613
1614 reset:
1615 tcp_v6_send_reset(sk, skb);
1616 discard:
1617 if (opt_skb)
1618 __kfree_skb(opt_skb);
1619 kfree_skb(skb);
1620 return 0;
1621 csum_err:
1622 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1623 goto discard;
1624
1625
1626 ipv6_pktoptions:
1627 /* Do you ask, what is it?
1628
1629 1. skb was enqueued by tcp.
1630 2. skb is added to tail of read queue, rather than out of order.
1631 3. socket is not in passive state.
1632 4. Finally, it really contains options, which user wants to receive.
1633 */
1634 tp = tcp_sk(sk);
1635 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1636 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1637 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1638 np->mcast_oif = inet6_iif(opt_skb);
1639 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1640 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1641 if (ipv6_opt_accepted(sk, opt_skb)) {
1642 skb_set_owner_r(opt_skb, sk);
1643 opt_skb = xchg(&np->pktoptions, opt_skb);
1644 } else {
1645 __kfree_skb(opt_skb);
1646 opt_skb = xchg(&np->pktoptions, NULL);
1647 }
1648 }
1649
1650 if (opt_skb)
1651 kfree_skb(opt_skb);
1652 return 0;
1653 }
1654
1655 static int tcp_v6_rcv(struct sk_buff *skb)
1656 {
1657 struct tcphdr *th;
1658 struct sock *sk;
1659 int ret;
1660 struct net *net = dev_net(skb->dev);
1661
1662 if (skb->pkt_type != PACKET_HOST)
1663 goto discard_it;
1664
1665 /*
1666 * Count it even if it's bad.
1667 */
1668 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1669
1670 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1671 goto discard_it;
1672
1673 th = tcp_hdr(skb);
1674
1675 if (th->doff < sizeof(struct tcphdr)/4)
1676 goto bad_packet;
1677 if (!pskb_may_pull(skb, th->doff*4))
1678 goto discard_it;
1679
1680 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1681 goto bad_packet;
1682
1683 th = tcp_hdr(skb);
1684 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1685 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1686 skb->len - th->doff*4);
1687 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1688 TCP_SKB_CB(skb)->when = 0;
1689 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1690 TCP_SKB_CB(skb)->sacked = 0;
1691
1692 sk = __inet6_lookup(net, &tcp_hashinfo,
1693 &ipv6_hdr(skb)->saddr, th->source,
1694 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1695 inet6_iif(skb));
1696
1697 if (!sk)
1698 goto no_tcp_socket;
1699
1700 process:
1701 if (sk->sk_state == TCP_TIME_WAIT)
1702 goto do_time_wait;
1703
1704 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1705 goto discard_and_relse;
1706
1707 if (sk_filter(sk, skb))
1708 goto discard_and_relse;
1709
1710 skb->dev = NULL;
1711
1712 bh_lock_sock_nested(sk);
1713 ret = 0;
1714 if (!sock_owned_by_user(sk)) {
1715 #ifdef CONFIG_NET_DMA
1716 struct tcp_sock *tp = tcp_sk(sk);
1717 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1718 tp->ucopy.dma_chan = get_softnet_dma();
1719 if (tp->ucopy.dma_chan)
1720 ret = tcp_v6_do_rcv(sk, skb);
1721 else
1722 #endif
1723 {
1724 if (!tcp_prequeue(sk, skb))
1725 ret = tcp_v6_do_rcv(sk, skb);
1726 }
1727 } else
1728 sk_add_backlog(sk, skb);
1729 bh_unlock_sock(sk);
1730
1731 sock_put(sk);
1732 return ret ? -1 : 0;
1733
1734 no_tcp_socket:
1735 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1736 goto discard_it;
1737
1738 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1739 bad_packet:
1740 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1741 } else {
1742 tcp_v6_send_reset(NULL, skb);
1743 }
1744
1745 discard_it:
1746
1747 /*
1748 * Discard frame
1749 */
1750
1751 kfree_skb(skb);
1752 return 0;
1753
1754 discard_and_relse:
1755 sock_put(sk);
1756 goto discard_it;
1757
1758 do_time_wait:
1759 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1760 inet_twsk_put(inet_twsk(sk));
1761 goto discard_it;
1762 }
1763
1764 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1765 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1766 inet_twsk_put(inet_twsk(sk));
1767 goto discard_it;
1768 }
1769
1770 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1771 case TCP_TW_SYN:
1772 {
1773 struct sock *sk2;
1774
1775 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1776 &ipv6_hdr(skb)->daddr,
1777 ntohs(th->dest), inet6_iif(skb));
1778 if (sk2 != NULL) {
1779 struct inet_timewait_sock *tw = inet_twsk(sk);
1780 inet_twsk_deschedule(tw, &tcp_death_row);
1781 inet_twsk_put(tw);
1782 sk = sk2;
1783 goto process;
1784 }
1785 /* Fall through to ACK */
1786 }
1787 case TCP_TW_ACK:
1788 tcp_v6_timewait_ack(sk, skb);
1789 break;
1790 case TCP_TW_RST:
1791 goto no_tcp_socket;
1792 case TCP_TW_SUCCESS:;
1793 }
1794 goto discard_it;
1795 }
1796
1797 static int tcp_v6_remember_stamp(struct sock *sk)
1798 {
1799 /* Alas, not yet... */
1800 return 0;
1801 }
1802
1803 static struct inet_connection_sock_af_ops ipv6_specific = {
1804 .queue_xmit = inet6_csk_xmit,
1805 .send_check = tcp_v6_send_check,
1806 .rebuild_header = inet6_sk_rebuild_header,
1807 .conn_request = tcp_v6_conn_request,
1808 .syn_recv_sock = tcp_v6_syn_recv_sock,
1809 .remember_stamp = tcp_v6_remember_stamp,
1810 .net_header_len = sizeof(struct ipv6hdr),
1811 .setsockopt = ipv6_setsockopt,
1812 .getsockopt = ipv6_getsockopt,
1813 .addr2sockaddr = inet6_csk_addr2sockaddr,
1814 .sockaddr_len = sizeof(struct sockaddr_in6),
1815 .bind_conflict = inet6_csk_bind_conflict,
1816 #ifdef CONFIG_COMPAT
1817 .compat_setsockopt = compat_ipv6_setsockopt,
1818 .compat_getsockopt = compat_ipv6_getsockopt,
1819 #endif
1820 };
1821
1822 #ifdef CONFIG_TCP_MD5SIG
1823 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1824 .md5_lookup = tcp_v6_md5_lookup,
1825 .calc_md5_hash = tcp_v6_md5_hash_skb,
1826 .md5_add = tcp_v6_md5_add_func,
1827 .md5_parse = tcp_v6_parse_md5_keys,
1828 };
1829 #endif
1830
1831 /*
1832 * TCP over IPv4 via INET6 API
1833 */
1834
1835 static struct inet_connection_sock_af_ops ipv6_mapped = {
1836 .queue_xmit = ip_queue_xmit,
1837 .send_check = tcp_v4_send_check,
1838 .rebuild_header = inet_sk_rebuild_header,
1839 .conn_request = tcp_v6_conn_request,
1840 .syn_recv_sock = tcp_v6_syn_recv_sock,
1841 .remember_stamp = tcp_v4_remember_stamp,
1842 .net_header_len = sizeof(struct iphdr),
1843 .setsockopt = ipv6_setsockopt,
1844 .getsockopt = ipv6_getsockopt,
1845 .addr2sockaddr = inet6_csk_addr2sockaddr,
1846 .sockaddr_len = sizeof(struct sockaddr_in6),
1847 .bind_conflict = inet6_csk_bind_conflict,
1848 #ifdef CONFIG_COMPAT
1849 .compat_setsockopt = compat_ipv6_setsockopt,
1850 .compat_getsockopt = compat_ipv6_getsockopt,
1851 #endif
1852 };
1853
1854 #ifdef CONFIG_TCP_MD5SIG
1855 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1856 .md5_lookup = tcp_v4_md5_lookup,
1857 .calc_md5_hash = tcp_v4_md5_hash_skb,
1858 .md5_add = tcp_v6_md5_add_func,
1859 .md5_parse = tcp_v6_parse_md5_keys,
1860 };
1861 #endif
1862
1863 /* NOTE: A lot of things set to zero explicitly by call to
1864 * sk_alloc() so need not be done here.
1865 */
1866 static int tcp_v6_init_sock(struct sock *sk)
1867 {
1868 struct inet_connection_sock *icsk = inet_csk(sk);
1869 struct tcp_sock *tp = tcp_sk(sk);
1870
1871 skb_queue_head_init(&tp->out_of_order_queue);
1872 tcp_init_xmit_timers(sk);
1873 tcp_prequeue_init(tp);
1874
1875 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1876 tp->mdev = TCP_TIMEOUT_INIT;
1877
1878 /* So many TCP implementations out there (incorrectly) count the
1879 * initial SYN frame in their delayed-ACK and congestion control
1880 * algorithms that we must have the following bandaid to talk
1881 * efficiently to them. -DaveM
1882 */
1883 tp->snd_cwnd = 2;
1884
1885 /* See draft-stevens-tcpca-spec-01 for discussion of the
1886 * initialization of these values.
1887 */
1888 tp->snd_ssthresh = 0x7fffffff;
1889 tp->snd_cwnd_clamp = ~0;
1890 tp->mss_cache = 536;
1891
1892 tp->reordering = sysctl_tcp_reordering;
1893
1894 sk->sk_state = TCP_CLOSE;
1895
1896 icsk->icsk_af_ops = &ipv6_specific;
1897 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1898 icsk->icsk_sync_mss = tcp_sync_mss;
1899 sk->sk_write_space = sk_stream_write_space;
1900 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1901
1902 #ifdef CONFIG_TCP_MD5SIG
1903 tp->af_specific = &tcp_sock_ipv6_specific;
1904 #endif
1905
1906 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1907 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1908
1909 atomic_inc(&tcp_sockets_allocated);
1910
1911 return 0;
1912 }
1913
1914 static void tcp_v6_destroy_sock(struct sock *sk)
1915 {
1916 #ifdef CONFIG_TCP_MD5SIG
1917 /* Clean up the MD5 key list */
1918 if (tcp_sk(sk)->md5sig_info)
1919 tcp_v6_clear_md5_list(sk);
1920 #endif
1921 tcp_v4_destroy_sock(sk);
1922 inet6_destroy_sock(sk);
1923 }
1924
1925 #ifdef CONFIG_PROC_FS
1926 /* Proc filesystem TCPv6 sock list dumping. */
1927 static void get_openreq6(struct seq_file *seq,
1928 struct sock *sk, struct request_sock *req, int i, int uid)
1929 {
1930 int ttd = req->expires - jiffies;
1931 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1932 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1933
1934 if (ttd < 0)
1935 ttd = 0;
1936
1937 seq_printf(seq,
1938 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1939 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1940 i,
1941 src->s6_addr32[0], src->s6_addr32[1],
1942 src->s6_addr32[2], src->s6_addr32[3],
1943 ntohs(inet_sk(sk)->sport),
1944 dest->s6_addr32[0], dest->s6_addr32[1],
1945 dest->s6_addr32[2], dest->s6_addr32[3],
1946 ntohs(inet_rsk(req)->rmt_port),
1947 TCP_SYN_RECV,
1948 0,0, /* could print option size, but that is af dependent. */
1949 1, /* timers active (only the expire timer) */
1950 jiffies_to_clock_t(ttd),
1951 req->retrans,
1952 uid,
1953 0, /* non standard timer */
1954 0, /* open_requests have no inode */
1955 0, req);
1956 }
1957
1958 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1959 {
1960 struct in6_addr *dest, *src;
1961 __u16 destp, srcp;
1962 int timer_active;
1963 unsigned long timer_expires;
1964 struct inet_sock *inet = inet_sk(sp);
1965 struct tcp_sock *tp = tcp_sk(sp);
1966 const struct inet_connection_sock *icsk = inet_csk(sp);
1967 struct ipv6_pinfo *np = inet6_sk(sp);
1968
1969 dest = &np->daddr;
1970 src = &np->rcv_saddr;
1971 destp = ntohs(inet->dport);
1972 srcp = ntohs(inet->sport);
1973
1974 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1975 timer_active = 1;
1976 timer_expires = icsk->icsk_timeout;
1977 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1978 timer_active = 4;
1979 timer_expires = icsk->icsk_timeout;
1980 } else if (timer_pending(&sp->sk_timer)) {
1981 timer_active = 2;
1982 timer_expires = sp->sk_timer.expires;
1983 } else {
1984 timer_active = 0;
1985 timer_expires = jiffies;
1986 }
1987
1988 seq_printf(seq,
1989 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1990 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
1991 i,
1992 src->s6_addr32[0], src->s6_addr32[1],
1993 src->s6_addr32[2], src->s6_addr32[3], srcp,
1994 dest->s6_addr32[0], dest->s6_addr32[1],
1995 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1996 sp->sk_state,
1997 tp->write_seq-tp->snd_una,
1998 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1999 timer_active,
2000 jiffies_to_clock_t(timer_expires - jiffies),
2001 icsk->icsk_retransmits,
2002 sock_i_uid(sp),
2003 icsk->icsk_probes_out,
2004 sock_i_ino(sp),
2005 atomic_read(&sp->sk_refcnt), sp,
2006 jiffies_to_clock_t(icsk->icsk_rto),
2007 jiffies_to_clock_t(icsk->icsk_ack.ato),
2008 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
2009 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
2010 );
2011 }
2012
2013 static void get_timewait6_sock(struct seq_file *seq,
2014 struct inet_timewait_sock *tw, int i)
2015 {
2016 struct in6_addr *dest, *src;
2017 __u16 destp, srcp;
2018 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
2019 int ttd = tw->tw_ttd - jiffies;
2020
2021 if (ttd < 0)
2022 ttd = 0;
2023
2024 dest = &tw6->tw_v6_daddr;
2025 src = &tw6->tw_v6_rcv_saddr;
2026 destp = ntohs(tw->tw_dport);
2027 srcp = ntohs(tw->tw_sport);
2028
2029 seq_printf(seq,
2030 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2031 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
2032 i,
2033 src->s6_addr32[0], src->s6_addr32[1],
2034 src->s6_addr32[2], src->s6_addr32[3], srcp,
2035 dest->s6_addr32[0], dest->s6_addr32[1],
2036 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2037 tw->tw_substate, 0, 0,
2038 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2039 atomic_read(&tw->tw_refcnt), tw);
2040 }
2041
2042 static int tcp6_seq_show(struct seq_file *seq, void *v)
2043 {
2044 struct tcp_iter_state *st;
2045
2046 if (v == SEQ_START_TOKEN) {
2047 seq_puts(seq,
2048 " sl "
2049 "local_address "
2050 "remote_address "
2051 "st tx_queue rx_queue tr tm->when retrnsmt"
2052 " uid timeout inode\n");
2053 goto out;
2054 }
2055 st = seq->private;
2056
2057 switch (st->state) {
2058 case TCP_SEQ_STATE_LISTENING:
2059 case TCP_SEQ_STATE_ESTABLISHED:
2060 get_tcp6_sock(seq, v, st->num);
2061 break;
2062 case TCP_SEQ_STATE_OPENREQ:
2063 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2064 break;
2065 case TCP_SEQ_STATE_TIME_WAIT:
2066 get_timewait6_sock(seq, v, st->num);
2067 break;
2068 }
2069 out:
2070 return 0;
2071 }
2072
2073 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2074 .name = "tcp6",
2075 .family = AF_INET6,
2076 .seq_fops = {
2077 .owner = THIS_MODULE,
2078 },
2079 .seq_ops = {
2080 .show = tcp6_seq_show,
2081 },
2082 };
2083
2084 int tcp6_proc_init(struct net *net)
2085 {
2086 return tcp_proc_register(net, &tcp6_seq_afinfo);
2087 }
2088
2089 void tcp6_proc_exit(struct net *net)
2090 {
2091 tcp_proc_unregister(net, &tcp6_seq_afinfo);
2092 }
2093 #endif
2094
2095 struct proto tcpv6_prot = {
2096 .name = "TCPv6",
2097 .owner = THIS_MODULE,
2098 .close = tcp_close,
2099 .connect = tcp_v6_connect,
2100 .disconnect = tcp_disconnect,
2101 .accept = inet_csk_accept,
2102 .ioctl = tcp_ioctl,
2103 .init = tcp_v6_init_sock,
2104 .destroy = tcp_v6_destroy_sock,
2105 .shutdown = tcp_shutdown,
2106 .setsockopt = tcp_setsockopt,
2107 .getsockopt = tcp_getsockopt,
2108 .recvmsg = tcp_recvmsg,
2109 .backlog_rcv = tcp_v6_do_rcv,
2110 .hash = tcp_v6_hash,
2111 .unhash = inet_unhash,
2112 .get_port = inet_csk_get_port,
2113 .enter_memory_pressure = tcp_enter_memory_pressure,
2114 .sockets_allocated = &tcp_sockets_allocated,
2115 .memory_allocated = &tcp_memory_allocated,
2116 .memory_pressure = &tcp_memory_pressure,
2117 .orphan_count = &tcp_orphan_count,
2118 .sysctl_mem = sysctl_tcp_mem,
2119 .sysctl_wmem = sysctl_tcp_wmem,
2120 .sysctl_rmem = sysctl_tcp_rmem,
2121 .max_header = MAX_TCP_HEADER,
2122 .obj_size = sizeof(struct tcp6_sock),
2123 .twsk_prot = &tcp6_timewait_sock_ops,
2124 .rsk_prot = &tcp6_request_sock_ops,
2125 .h.hashinfo = &tcp_hashinfo,
2126 #ifdef CONFIG_COMPAT
2127 .compat_setsockopt = compat_tcp_setsockopt,
2128 .compat_getsockopt = compat_tcp_getsockopt,
2129 #endif
2130 };
2131
2132 static struct inet6_protocol tcpv6_protocol = {
2133 .handler = tcp_v6_rcv,
2134 .err_handler = tcp_v6_err,
2135 .gso_send_check = tcp_v6_gso_send_check,
2136 .gso_segment = tcp_tso_segment,
2137 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2138 };
2139
2140 static struct inet_protosw tcpv6_protosw = {
2141 .type = SOCK_STREAM,
2142 .protocol = IPPROTO_TCP,
2143 .prot = &tcpv6_prot,
2144 .ops = &inet6_stream_ops,
2145 .capability = -1,
2146 .no_check = 0,
2147 .flags = INET_PROTOSW_PERMANENT |
2148 INET_PROTOSW_ICSK,
2149 };
2150
2151 static int tcpv6_net_init(struct net *net)
2152 {
2153 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2154 SOCK_RAW, IPPROTO_TCP, net);
2155 }
2156
2157 static void tcpv6_net_exit(struct net *net)
2158 {
2159 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
2160 }
2161
2162 static struct pernet_operations tcpv6_net_ops = {
2163 .init = tcpv6_net_init,
2164 .exit = tcpv6_net_exit,
2165 };
2166
2167 int __init tcpv6_init(void)
2168 {
2169 int ret;
2170
2171 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2172 if (ret)
2173 goto out;
2174
2175 /* register inet6 protocol */
2176 ret = inet6_register_protosw(&tcpv6_protosw);
2177 if (ret)
2178 goto out_tcpv6_protocol;
2179
2180 ret = register_pernet_subsys(&tcpv6_net_ops);
2181 if (ret)
2182 goto out_tcpv6_protosw;
2183 out:
2184 return ret;
2185
2186 out_tcpv6_protocol:
2187 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2188 out_tcpv6_protosw:
2189 inet6_unregister_protosw(&tcpv6_protosw);
2190 goto out;
2191 }
2192
2193 void tcpv6_exit(void)
2194 {
2195 unregister_pernet_subsys(&tcpv6_net_ops);
2196 inet6_unregister_protosw(&tcpv6_protosw);
2197 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2198 }
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