projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[IPV6] ADDRCONF: Convert ipv6_get_saddr() to ipv6_dev_get_saddr().
[deliverable/linux.git] / net / ipv6 / tcp_ipv6.c
1 /*
2 * TCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
9 *
10 * Based on:
11 * linux/net/ipv4/tcp.c
12 * linux/net/ipv4/tcp_input.c
13 * linux/net/ipv4/tcp_output.c
14 *
15 * Fixes:
16 * Hideaki YOSHIFUJI : sin6_scope_id support
17 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
18 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
19 * a single port at the same time.
20 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/types.h>
31 #include <linux/socket.h>
32 #include <linux/sockios.h>
33 #include <linux/net.h>
34 #include <linux/jiffies.h>
35 #include <linux/in.h>
36 #include <linux/in6.h>
37 #include <linux/netdevice.h>
38 #include <linux/init.h>
39 #include <linux/jhash.h>
40 #include <linux/ipsec.h>
41 #include <linux/times.h>
42
43 #include <linux/ipv6.h>
44 #include <linux/icmpv6.h>
45 #include <linux/random.h>
46
47 #include <net/tcp.h>
48 #include <net/ndisc.h>
49 #include <net/inet6_hashtables.h>
50 #include <net/inet6_connection_sock.h>
51 #include <net/ipv6.h>
52 #include <net/transp_v6.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_route.h>
55 #include <net/ip6_checksum.h>
56 #include <net/inet_ecn.h>
57 #include <net/protocol.h>
58 #include <net/xfrm.h>
59 #include <net/snmp.h>
60 #include <net/dsfield.h>
61 #include <net/timewait_sock.h>
62 #include <net/netdma.h>
63
64 #include <asm/uaccess.h>
65
66 #include <linux/proc_fs.h>
67 #include <linux/seq_file.h>
68
69 #include <linux/crypto.h>
70 #include <linux/scatterlist.h>
71
72 /* Socket used for sending RSTs and ACKs */
73 static struct socket *tcp6_socket;
74
75 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
76 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
77 static void tcp_v6_send_check(struct sock *sk, int len,
78 struct sk_buff *skb);
79
80 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
81
82 static struct inet_connection_sock_af_ops ipv6_mapped;
83 static struct inet_connection_sock_af_ops ipv6_specific;
84 #ifdef CONFIG_TCP_MD5SIG
85 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
86 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
87 #endif
88
89 static 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
327 sk = inet6_lookup(skb->dev->nd_net, &tcp_hashinfo, &hdr->daddr,
328 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
329
330 if (sk == NULL) {
331 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
332 return;
333 }
334
335 if (sk->sk_state == TCP_TIME_WAIT) {
336 inet_twsk_put(inet_twsk(sk));
337 return;
338 }
339
340 bh_lock_sock(sk);
341 if (sock_owned_by_user(sk))
342 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
343
344 if (sk->sk_state == TCP_CLOSE)
345 goto out;
346
347 tp = tcp_sk(sk);
348 seq = ntohl(th->seq);
349 if (sk->sk_state != TCP_LISTEN &&
350 !between(seq, tp->snd_una, tp->snd_nxt)) {
351 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
352 goto out;
353 }
354
355 np = inet6_sk(sk);
356
357 if (type == ICMPV6_PKT_TOOBIG) {
358 struct dst_entry *dst = NULL;
359
360 if (sock_owned_by_user(sk))
361 goto out;
362 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
363 goto out;
364
365 /* icmp should have updated the destination cache entry */
366 dst = __sk_dst_check(sk, np->dst_cookie);
367
368 if (dst == NULL) {
369 struct inet_sock *inet = inet_sk(sk);
370 struct flowi fl;
371
372 /* BUGGG_FUTURE: Again, it is not clear how
373 to handle rthdr case. Ignore this complexity
374 for now.
375 */
376 memset(&fl, 0, sizeof(fl));
377 fl.proto = IPPROTO_TCP;
378 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
379 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
380 fl.oif = sk->sk_bound_dev_if;
381 fl.fl_ip_dport = inet->dport;
382 fl.fl_ip_sport = inet->sport;
383 security_skb_classify_flow(skb, &fl);
384
385 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
386 sk->sk_err_soft = -err;
387 goto out;
388 }
389
390 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
391 sk->sk_err_soft = -err;
392 goto out;
393 }
394
395 } else
396 dst_hold(dst);
397
398 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
399 tcp_sync_mss(sk, dst_mtu(dst));
400 tcp_simple_retransmit(sk);
401 } /* else let the usual retransmit timer handle it */
402 dst_release(dst);
403 goto out;
404 }
405
406 icmpv6_err_convert(type, code, &err);
407
408 /* Might be for an request_sock */
409 switch (sk->sk_state) {
410 struct request_sock *req, **prev;
411 case TCP_LISTEN:
412 if (sock_owned_by_user(sk))
413 goto out;
414
415 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
416 &hdr->saddr, inet6_iif(skb));
417 if (!req)
418 goto out;
419
420 /* ICMPs are not backlogged, hence we cannot get
421 * an established socket here.
422 */
423 BUG_TRAP(req->sk == NULL);
424
425 if (seq != tcp_rsk(req)->snt_isn) {
426 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
427 goto out;
428 }
429
430 inet_csk_reqsk_queue_drop(sk, req, prev);
431 goto out;
432
433 case TCP_SYN_SENT:
434 case TCP_SYN_RECV: /* Cannot happen.
435 It can, it SYNs are crossed. --ANK */
436 if (!sock_owned_by_user(sk)) {
437 sk->sk_err = err;
438 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
439
440 tcp_done(sk);
441 } else
442 sk->sk_err_soft = err;
443 goto out;
444 }
445
446 if (!sock_owned_by_user(sk) && np->recverr) {
447 sk->sk_err = err;
448 sk->sk_error_report(sk);
449 } else
450 sk->sk_err_soft = err;
451
452 out:
453 bh_unlock_sock(sk);
454 sock_put(sk);
455 }
456
457
458 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
459 {
460 struct inet6_request_sock *treq = inet6_rsk(req);
461 struct ipv6_pinfo *np = inet6_sk(sk);
462 struct sk_buff * skb;
463 struct ipv6_txoptions *opt = NULL;
464 struct in6_addr * final_p = NULL, final;
465 struct flowi fl;
466 struct dst_entry *dst;
467 int err = -1;
468
469 memset(&fl, 0, sizeof(fl));
470 fl.proto = IPPROTO_TCP;
471 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
472 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
473 fl.fl6_flowlabel = 0;
474 fl.oif = treq->iif;
475 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
476 fl.fl_ip_sport = inet_sk(sk)->sport;
477 security_req_classify_flow(req, &fl);
478
479 opt = np->opt;
480 if (opt && opt->srcrt) {
481 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
482 ipv6_addr_copy(&final, &fl.fl6_dst);
483 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
484 final_p = &final;
485 }
486
487 err = ip6_dst_lookup(sk, &dst, &fl);
488 if (err)
489 goto done;
490 if (final_p)
491 ipv6_addr_copy(&fl.fl6_dst, final_p);
492 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
493 goto done;
494
495 skb = tcp_make_synack(sk, dst, req);
496 if (skb) {
497 struct tcphdr *th = tcp_hdr(skb);
498
499 th->check = tcp_v6_check(th, skb->len,
500 &treq->loc_addr, &treq->rmt_addr,
501 csum_partial((char *)th, skb->len, skb->csum));
502
503 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
504 err = ip6_xmit(sk, skb, &fl, opt, 0);
505 err = net_xmit_eval(err);
506 }
507
508 done:
509 if (opt && opt != np->opt)
510 sock_kfree_s(sk, opt, opt->tot_len);
511 dst_release(dst);
512 return err;
513 }
514
515 static inline void syn_flood_warning(struct sk_buff *skb)
516 {
517 #ifdef CONFIG_SYN_COOKIES
518 if (sysctl_tcp_syncookies)
519 printk(KERN_INFO
520 "TCPv6: Possible SYN flooding on port %d. "
521 "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
522 else
523 #endif
524 printk(KERN_INFO
525 "TCPv6: Possible SYN flooding on port %d. "
526 "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
527 }
528
529 static void tcp_v6_reqsk_destructor(struct request_sock *req)
530 {
531 if (inet6_rsk(req)->pktopts)
532 kfree_skb(inet6_rsk(req)->pktopts);
533 }
534
535 #ifdef CONFIG_TCP_MD5SIG
536 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
537 struct in6_addr *addr)
538 {
539 struct tcp_sock *tp = tcp_sk(sk);
540 int i;
541
542 BUG_ON(tp == NULL);
543
544 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
545 return NULL;
546
547 for (i = 0; i < tp->md5sig_info->entries6; i++) {
548 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
549 return &tp->md5sig_info->keys6[i].base;
550 }
551 return NULL;
552 }
553
554 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
555 struct sock *addr_sk)
556 {
557 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
558 }
559
560 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
561 struct request_sock *req)
562 {
563 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
564 }
565
566 static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
567 char *newkey, u8 newkeylen)
568 {
569 /* Add key to the list */
570 struct tcp_md5sig_key *key;
571 struct tcp_sock *tp = tcp_sk(sk);
572 struct tcp6_md5sig_key *keys;
573
574 key = tcp_v6_md5_do_lookup(sk, peer);
575 if (key) {
576 /* modify existing entry - just update that one */
577 kfree(key->key);
578 key->key = newkey;
579 key->keylen = newkeylen;
580 } else {
581 /* reallocate new list if current one is full. */
582 if (!tp->md5sig_info) {
583 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
584 if (!tp->md5sig_info) {
585 kfree(newkey);
586 return -ENOMEM;
587 }
588 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
589 }
590 if (tcp_alloc_md5sig_pool() == NULL) {
591 kfree(newkey);
592 return -ENOMEM;
593 }
594 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
595 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
596 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
597
598 if (!keys) {
599 tcp_free_md5sig_pool();
600 kfree(newkey);
601 return -ENOMEM;
602 }
603
604 if (tp->md5sig_info->entries6)
605 memmove(keys, tp->md5sig_info->keys6,
606 (sizeof (tp->md5sig_info->keys6[0]) *
607 tp->md5sig_info->entries6));
608
609 kfree(tp->md5sig_info->keys6);
610 tp->md5sig_info->keys6 = keys;
611 tp->md5sig_info->alloced6++;
612 }
613
614 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
615 peer);
616 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
617 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
618
619 tp->md5sig_info->entries6++;
620 }
621 return 0;
622 }
623
624 static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
625 u8 *newkey, __u8 newkeylen)
626 {
627 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
628 newkey, newkeylen);
629 }
630
631 static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
632 {
633 struct tcp_sock *tp = tcp_sk(sk);
634 int i;
635
636 for (i = 0; i < tp->md5sig_info->entries6; i++) {
637 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
638 /* Free the key */
639 kfree(tp->md5sig_info->keys6[i].base.key);
640 tp->md5sig_info->entries6--;
641
642 if (tp->md5sig_info->entries6 == 0) {
643 kfree(tp->md5sig_info->keys6);
644 tp->md5sig_info->keys6 = NULL;
645 tp->md5sig_info->alloced6 = 0;
646 } else {
647 /* shrink the database */
648 if (tp->md5sig_info->entries6 != i)
649 memmove(&tp->md5sig_info->keys6[i],
650 &tp->md5sig_info->keys6[i+1],
651 (tp->md5sig_info->entries6 - i)
652 * sizeof (tp->md5sig_info->keys6[0]));
653 }
654 tcp_free_md5sig_pool();
655 return 0;
656 }
657 }
658 return -ENOENT;
659 }
660
661 static void tcp_v6_clear_md5_list (struct sock *sk)
662 {
663 struct tcp_sock *tp = tcp_sk(sk);
664 int i;
665
666 if (tp->md5sig_info->entries6) {
667 for (i = 0; i < tp->md5sig_info->entries6; i++)
668 kfree(tp->md5sig_info->keys6[i].base.key);
669 tp->md5sig_info->entries6 = 0;
670 tcp_free_md5sig_pool();
671 }
672
673 kfree(tp->md5sig_info->keys6);
674 tp->md5sig_info->keys6 = NULL;
675 tp->md5sig_info->alloced6 = 0;
676
677 if (tp->md5sig_info->entries4) {
678 for (i = 0; i < tp->md5sig_info->entries4; i++)
679 kfree(tp->md5sig_info->keys4[i].base.key);
680 tp->md5sig_info->entries4 = 0;
681 tcp_free_md5sig_pool();
682 }
683
684 kfree(tp->md5sig_info->keys4);
685 tp->md5sig_info->keys4 = NULL;
686 tp->md5sig_info->alloced4 = 0;
687 }
688
689 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
690 int optlen)
691 {
692 struct tcp_md5sig cmd;
693 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
694 u8 *newkey;
695
696 if (optlen < sizeof(cmd))
697 return -EINVAL;
698
699 if (copy_from_user(&cmd, optval, sizeof(cmd)))
700 return -EFAULT;
701
702 if (sin6->sin6_family != AF_INET6)
703 return -EINVAL;
704
705 if (!cmd.tcpm_keylen) {
706 if (!tcp_sk(sk)->md5sig_info)
707 return -ENOENT;
708 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
709 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
710 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
711 }
712
713 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
714 return -EINVAL;
715
716 if (!tcp_sk(sk)->md5sig_info) {
717 struct tcp_sock *tp = tcp_sk(sk);
718 struct tcp_md5sig_info *p;
719
720 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
721 if (!p)
722 return -ENOMEM;
723
724 tp->md5sig_info = p;
725 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
726 }
727
728 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
729 if (!newkey)
730 return -ENOMEM;
731 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
732 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
733 newkey, cmd.tcpm_keylen);
734 }
735 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
736 }
737
738 static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
739 struct in6_addr *saddr,
740 struct in6_addr *daddr,
741 struct tcphdr *th, int protocol,
742 unsigned int tcplen)
743 {
744 struct scatterlist sg[4];
745 __u16 data_len;
746 int block = 0;
747 __sum16 cksum;
748 struct tcp_md5sig_pool *hp;
749 struct tcp6_pseudohdr *bp;
750 struct hash_desc *desc;
751 int err;
752 unsigned int nbytes = 0;
753
754 hp = tcp_get_md5sig_pool();
755 if (!hp) {
756 printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__);
757 goto clear_hash_noput;
758 }
759 bp = &hp->md5_blk.ip6;
760 desc = &hp->md5_desc;
761
762 /* 1. TCP pseudo-header (RFC2460) */
763 ipv6_addr_copy(&bp->saddr, saddr);
764 ipv6_addr_copy(&bp->daddr, daddr);
765 bp->len = htonl(tcplen);
766 bp->protocol = htonl(protocol);
767
768 sg_init_table(sg, 4);
769
770 sg_set_buf(&sg[block++], bp, sizeof(*bp));
771 nbytes += sizeof(*bp);
772
773 /* 2. TCP header, excluding options */
774 cksum = th->check;
775 th->check = 0;
776 sg_set_buf(&sg[block++], th, sizeof(*th));
777 nbytes += sizeof(*th);
778
779 /* 3. TCP segment data (if any) */
780 data_len = tcplen - (th->doff << 2);
781 if (data_len > 0) {
782 u8 *data = (u8 *)th + (th->doff << 2);
783 sg_set_buf(&sg[block++], data, data_len);
784 nbytes += data_len;
785 }
786
787 /* 4. shared key */
788 sg_set_buf(&sg[block++], key->key, key->keylen);
789 nbytes += key->keylen;
790
791 sg_mark_end(&sg[block - 1]);
792
793 /* Now store the hash into the packet */
794 err = crypto_hash_init(desc);
795 if (err) {
796 printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
797 goto clear_hash;
798 }
799 err = crypto_hash_update(desc, sg, nbytes);
800 if (err) {
801 printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
802 goto clear_hash;
803 }
804 err = crypto_hash_final(desc, md5_hash);
805 if (err) {
806 printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
807 goto clear_hash;
808 }
809
810 /* Reset header, and free up the crypto */
811 tcp_put_md5sig_pool();
812 th->check = cksum;
813 out:
814 return 0;
815 clear_hash:
816 tcp_put_md5sig_pool();
817 clear_hash_noput:
818 memset(md5_hash, 0, 16);
819 goto out;
820 }
821
822 static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
823 struct sock *sk,
824 struct dst_entry *dst,
825 struct request_sock *req,
826 struct tcphdr *th, int protocol,
827 unsigned int tcplen)
828 {
829 struct in6_addr *saddr, *daddr;
830
831 if (sk) {
832 saddr = &inet6_sk(sk)->saddr;
833 daddr = &inet6_sk(sk)->daddr;
834 } else {
835 saddr = &inet6_rsk(req)->loc_addr;
836 daddr = &inet6_rsk(req)->rmt_addr;
837 }
838 return tcp_v6_do_calc_md5_hash(md5_hash, key,
839 saddr, daddr,
840 th, protocol, tcplen);
841 }
842
843 static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
844 {
845 __u8 *hash_location = NULL;
846 struct tcp_md5sig_key *hash_expected;
847 struct ipv6hdr *ip6h = ipv6_hdr(skb);
848 struct tcphdr *th = tcp_hdr(skb);
849 int length = (th->doff << 2) - sizeof (*th);
850 int genhash;
851 u8 *ptr;
852 u8 newhash[16];
853
854 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
855
856 /* If the TCP option is too short, we can short cut */
857 if (length < TCPOLEN_MD5SIG)
858 return hash_expected ? 1 : 0;
859
860 /* parse options */
861 ptr = (u8*)(th + 1);
862 while (length > 0) {
863 int opcode = *ptr++;
864 int opsize;
865
866 switch(opcode) {
867 case TCPOPT_EOL:
868 goto done_opts;
869 case TCPOPT_NOP:
870 length--;
871 continue;
872 default:
873 opsize = *ptr++;
874 if (opsize < 2 || opsize > length)
875 goto done_opts;
876 if (opcode == TCPOPT_MD5SIG) {
877 hash_location = ptr;
878 goto done_opts;
879 }
880 }
881 ptr += opsize - 2;
882 length -= opsize;
883 }
884
885 done_opts:
886 /* do we have a hash as expected? */
887 if (!hash_expected) {
888 if (!hash_location)
889 return 0;
890 if (net_ratelimit()) {
891 printk(KERN_INFO "MD5 Hash NOT expected but found "
892 "(" NIP6_FMT ", %u)->"
893 "(" NIP6_FMT ", %u)\n",
894 NIP6(ip6h->saddr), ntohs(th->source),
895 NIP6(ip6h->daddr), ntohs(th->dest));
896 }
897 return 1;
898 }
899
900 if (!hash_location) {
901 if (net_ratelimit()) {
902 printk(KERN_INFO "MD5 Hash expected but NOT found "
903 "(" NIP6_FMT ", %u)->"
904 "(" NIP6_FMT ", %u)\n",
905 NIP6(ip6h->saddr), ntohs(th->source),
906 NIP6(ip6h->daddr), ntohs(th->dest));
907 }
908 return 1;
909 }
910
911 /* check the signature */
912 genhash = tcp_v6_do_calc_md5_hash(newhash,
913 hash_expected,
914 &ip6h->saddr, &ip6h->daddr,
915 th, sk->sk_protocol,
916 skb->len);
917 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
918 if (net_ratelimit()) {
919 printk(KERN_INFO "MD5 Hash %s for "
920 "(" NIP6_FMT ", %u)->"
921 "(" NIP6_FMT ", %u)\n",
922 genhash ? "failed" : "mismatch",
923 NIP6(ip6h->saddr), ntohs(th->source),
924 NIP6(ip6h->daddr), ntohs(th->dest));
925 }
926 return 1;
927 }
928 return 0;
929 }
930 #endif
931
932 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
933 .family = AF_INET6,
934 .obj_size = sizeof(struct tcp6_request_sock),
935 .rtx_syn_ack = tcp_v6_send_synack,
936 .send_ack = tcp_v6_reqsk_send_ack,
937 .destructor = tcp_v6_reqsk_destructor,
938 .send_reset = tcp_v6_send_reset
939 };
940
941 #ifdef CONFIG_TCP_MD5SIG
942 static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
943 .md5_lookup = tcp_v6_reqsk_md5_lookup,
944 };
945 #endif
946
947 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
948 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
949 .twsk_unique = tcp_twsk_unique,
950 .twsk_destructor= tcp_twsk_destructor,
951 };
952
953 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
954 {
955 struct ipv6_pinfo *np = inet6_sk(sk);
956 struct tcphdr *th = tcp_hdr(skb);
957
958 if (skb->ip_summed == CHECKSUM_PARTIAL) {
959 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
960 skb->csum_start = skb_transport_header(skb) - skb->head;
961 skb->csum_offset = offsetof(struct tcphdr, check);
962 } else {
963 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
964 csum_partial((char *)th, th->doff<<2,
965 skb->csum));
966 }
967 }
968
969 static int tcp_v6_gso_send_check(struct sk_buff *skb)
970 {
971 struct ipv6hdr *ipv6h;
972 struct tcphdr *th;
973
974 if (!pskb_may_pull(skb, sizeof(*th)))
975 return -EINVAL;
976
977 ipv6h = ipv6_hdr(skb);
978 th = tcp_hdr(skb);
979
980 th->check = 0;
981 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
982 IPPROTO_TCP, 0);
983 skb->csum_start = skb_transport_header(skb) - skb->head;
984 skb->csum_offset = offsetof(struct tcphdr, check);
985 skb->ip_summed = CHECKSUM_PARTIAL;
986 return 0;
987 }
988
989 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
990 {
991 struct tcphdr *th = tcp_hdr(skb), *t1;
992 struct sk_buff *buff;
993 struct flowi fl;
994 unsigned int tot_len = sizeof(*th);
995 #ifdef CONFIG_TCP_MD5SIG
996 struct tcp_md5sig_key *key;
997 #endif
998
999 if (th->rst)
1000 return;
1001
1002 if (!ipv6_unicast_destination(skb))
1003 return;
1004
1005 #ifdef CONFIG_TCP_MD5SIG
1006 if (sk)
1007 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1008 else
1009 key = NULL;
1010
1011 if (key)
1012 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1013 #endif
1014
1015 /*
1016 * We need to grab some memory, and put together an RST,
1017 * and then put it into the queue to be sent.
1018 */
1019
1020 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1021 GFP_ATOMIC);
1022 if (buff == NULL)
1023 return;
1024
1025 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1026
1027 t1 = (struct tcphdr *) skb_push(buff, tot_len);
1028
1029 /* Swap the send and the receive. */
1030 memset(t1, 0, sizeof(*t1));
1031 t1->dest = th->source;
1032 t1->source = th->dest;
1033 t1->doff = tot_len / 4;
1034 t1->rst = 1;
1035
1036 if(th->ack) {
1037 t1->seq = th->ack_seq;
1038 } else {
1039 t1->ack = 1;
1040 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
1041 + skb->len - (th->doff<<2));
1042 }
1043
1044 #ifdef CONFIG_TCP_MD5SIG
1045 if (key) {
1046 __be32 *opt = (__be32*)(t1 + 1);
1047 opt[0] = htonl((TCPOPT_NOP << 24) |
1048 (TCPOPT_NOP << 16) |
1049 (TCPOPT_MD5SIG << 8) |
1050 TCPOLEN_MD5SIG);
1051 tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
1052 &ipv6_hdr(skb)->daddr,
1053 &ipv6_hdr(skb)->saddr,
1054 t1, IPPROTO_TCP, tot_len);
1055 }
1056 #endif
1057
1058 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
1059
1060 memset(&fl, 0, sizeof(fl));
1061 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1062 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1063
1064 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1065 sizeof(*t1), IPPROTO_TCP,
1066 buff->csum);
1067
1068 fl.proto = IPPROTO_TCP;
1069 fl.oif = inet6_iif(skb);
1070 fl.fl_ip_dport = t1->dest;
1071 fl.fl_ip_sport = t1->source;
1072 security_skb_classify_flow(skb, &fl);
1073
1074 /* sk = NULL, but it is safe for now. RST socket required. */
1075 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
1076
1077 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1078 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
1079 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1080 TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
1081 return;
1082 }
1083 }
1084
1085 kfree_skb(buff);
1086 }
1087
1088 static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
1089 struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
1090 {
1091 struct tcphdr *th = tcp_hdr(skb), *t1;
1092 struct sk_buff *buff;
1093 struct flowi fl;
1094 unsigned int tot_len = sizeof(struct tcphdr);
1095 __be32 *topt;
1096 #ifdef CONFIG_TCP_MD5SIG
1097 struct tcp_md5sig_key *key;
1098 struct tcp_md5sig_key tw_key;
1099 #endif
1100
1101 #ifdef CONFIG_TCP_MD5SIG
1102 if (!tw && skb->sk) {
1103 key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr);
1104 } else if (tw && tw->tw_md5_keylen) {
1105 tw_key.key = tw->tw_md5_key;
1106 tw_key.keylen = tw->tw_md5_keylen;
1107 key = &tw_key;
1108 } else {
1109 key = NULL;
1110 }
1111 #endif
1112
1113 if (ts)
1114 tot_len += TCPOLEN_TSTAMP_ALIGNED;
1115 #ifdef CONFIG_TCP_MD5SIG
1116 if (key)
1117 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1118 #endif
1119
1120 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1121 GFP_ATOMIC);
1122 if (buff == NULL)
1123 return;
1124
1125 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1126
1127 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1128
1129 /* Swap the send and the receive. */
1130 memset(t1, 0, sizeof(*t1));
1131 t1->dest = th->source;
1132 t1->source = th->dest;
1133 t1->doff = tot_len/4;
1134 t1->seq = htonl(seq);
1135 t1->ack_seq = htonl(ack);
1136 t1->ack = 1;
1137 t1->window = htons(win);
1138
1139 topt = (__be32 *)(t1 + 1);
1140
1141 if (ts) {
1142 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1143 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1144 *topt++ = htonl(tcp_time_stamp);
1145 *topt = htonl(ts);
1146 }
1147
1148 #ifdef CONFIG_TCP_MD5SIG
1149 if (key) {
1150 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1151 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1152 tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
1153 &ipv6_hdr(skb)->daddr,
1154 &ipv6_hdr(skb)->saddr,
1155 t1, IPPROTO_TCP, tot_len);
1156 }
1157 #endif
1158
1159 buff->csum = csum_partial((char *)t1, tot_len, 0);
1160
1161 memset(&fl, 0, sizeof(fl));
1162 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1163 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1164
1165 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1166 tot_len, IPPROTO_TCP,
1167 buff->csum);
1168
1169 fl.proto = IPPROTO_TCP;
1170 fl.oif = inet6_iif(skb);
1171 fl.fl_ip_dport = t1->dest;
1172 fl.fl_ip_sport = t1->source;
1173 security_skb_classify_flow(skb, &fl);
1174
1175 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
1176 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
1177 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
1178 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1179 return;
1180 }
1181 }
1182
1183 kfree_skb(buff);
1184 }
1185
1186 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1187 {
1188 struct inet_timewait_sock *tw = inet_twsk(sk);
1189 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1190
1191 tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1192 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1193 tcptw->tw_ts_recent);
1194
1195 inet_twsk_put(tw);
1196 }
1197
1198 static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
1199 {
1200 tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
1201 }
1202
1203
1204 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1205 {
1206 struct request_sock *req, **prev;
1207 const struct tcphdr *th = tcp_hdr(skb);
1208 struct sock *nsk;
1209
1210 /* Find possible connection requests. */
1211 req = inet6_csk_search_req(sk, &prev, th->source,
1212 &ipv6_hdr(skb)->saddr,
1213 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1214 if (req)
1215 return tcp_check_req(sk, skb, req, prev);
1216
1217 nsk = __inet6_lookup_established(sk->sk_net, &tcp_hashinfo,
1218 &ipv6_hdr(skb)->saddr, th->source,
1219 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1220
1221 if (nsk) {
1222 if (nsk->sk_state != TCP_TIME_WAIT) {
1223 bh_lock_sock(nsk);
1224 return nsk;
1225 }
1226 inet_twsk_put(inet_twsk(nsk));
1227 return NULL;
1228 }
1229
1230 #ifdef CONFIG_SYN_COOKIES
1231 if (!th->rst && !th->syn && th->ack)
1232 sk = cookie_v6_check(sk, skb);
1233 #endif
1234 return sk;
1235 }
1236
1237 /* FIXME: this is substantially similar to the ipv4 code.
1238 * Can some kind of merge be done? -- erics
1239 */
1240 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1241 {
1242 struct inet6_request_sock *treq;
1243 struct ipv6_pinfo *np = inet6_sk(sk);
1244 struct tcp_options_received tmp_opt;
1245 struct tcp_sock *tp = tcp_sk(sk);
1246 struct request_sock *req = NULL;
1247 __u32 isn = TCP_SKB_CB(skb)->when;
1248 #ifdef CONFIG_SYN_COOKIES
1249 int want_cookie = 0;
1250 #else
1251 #define want_cookie 0
1252 #endif
1253
1254 if (skb->protocol == htons(ETH_P_IP))
1255 return tcp_v4_conn_request(sk, skb);
1256
1257 if (!ipv6_unicast_destination(skb))
1258 goto drop;
1259
1260 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1261 if (net_ratelimit())
1262 syn_flood_warning(skb);
1263 #ifdef CONFIG_SYN_COOKIES
1264 if (sysctl_tcp_syncookies)
1265 want_cookie = 1;
1266 else
1267 #endif
1268 goto drop;
1269 }
1270
1271 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1272 goto drop;
1273
1274 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1275 if (req == NULL)
1276 goto drop;
1277
1278 #ifdef CONFIG_TCP_MD5SIG
1279 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1280 #endif
1281
1282 tcp_clear_options(&tmp_opt);
1283 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1284 tmp_opt.user_mss = tp->rx_opt.user_mss;
1285
1286 tcp_parse_options(skb, &tmp_opt, 0);
1287
1288 if (want_cookie) {
1289 tcp_clear_options(&tmp_opt);
1290 tmp_opt.saw_tstamp = 0;
1291 }
1292
1293 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1294 tcp_openreq_init(req, &tmp_opt, skb);
1295
1296 treq = inet6_rsk(req);
1297 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1298 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1299 treq->pktopts = NULL;
1300 if (!want_cookie)
1301 TCP_ECN_create_request(req, tcp_hdr(skb));
1302
1303 if (want_cookie) {
1304 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1305 } else if (!isn) {
1306 if (ipv6_opt_accepted(sk, skb) ||
1307 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1308 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1309 atomic_inc(&skb->users);
1310 treq->pktopts = skb;
1311 }
1312 treq->iif = sk->sk_bound_dev_if;
1313
1314 /* So that link locals have meaning */
1315 if (!sk->sk_bound_dev_if &&
1316 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1317 treq->iif = inet6_iif(skb);
1318
1319 isn = tcp_v6_init_sequence(skb);
1320 }
1321
1322 tcp_rsk(req)->snt_isn = isn;
1323
1324 security_inet_conn_request(sk, skb, req);
1325
1326 if (tcp_v6_send_synack(sk, req))
1327 goto drop;
1328
1329 if (!want_cookie) {
1330 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1331 return 0;
1332 }
1333
1334 drop:
1335 if (req)
1336 reqsk_free(req);
1337
1338 return 0; /* don't send reset */
1339 }
1340
1341 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1342 struct request_sock *req,
1343 struct dst_entry *dst)
1344 {
1345 struct inet6_request_sock *treq = inet6_rsk(req);
1346 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1347 struct tcp6_sock *newtcp6sk;
1348 struct inet_sock *newinet;
1349 struct tcp_sock *newtp;
1350 struct sock *newsk;
1351 struct ipv6_txoptions *opt;
1352 #ifdef CONFIG_TCP_MD5SIG
1353 struct tcp_md5sig_key *key;
1354 #endif
1355
1356 if (skb->protocol == htons(ETH_P_IP)) {
1357 /*
1358 * v6 mapped
1359 */
1360
1361 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1362
1363 if (newsk == NULL)
1364 return NULL;
1365
1366 newtcp6sk = (struct tcp6_sock *)newsk;
1367 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1368
1369 newinet = inet_sk(newsk);
1370 newnp = inet6_sk(newsk);
1371 newtp = tcp_sk(newsk);
1372
1373 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1374
1375 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1376 newinet->daddr);
1377
1378 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1379 newinet->saddr);
1380
1381 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1382
1383 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1384 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1385 #ifdef CONFIG_TCP_MD5SIG
1386 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1387 #endif
1388
1389 newnp->pktoptions = NULL;
1390 newnp->opt = NULL;
1391 newnp->mcast_oif = inet6_iif(skb);
1392 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1393
1394 /*
1395 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1396 * here, tcp_create_openreq_child now does this for us, see the comment in
1397 * that function for the gory details. -acme
1398 */
1399
1400 /* It is tricky place. Until this moment IPv4 tcp
1401 worked with IPv6 icsk.icsk_af_ops.
1402 Sync it now.
1403 */
1404 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1405
1406 return newsk;
1407 }
1408
1409 opt = np->opt;
1410
1411 if (sk_acceptq_is_full(sk))
1412 goto out_overflow;
1413
1414 if (dst == NULL) {
1415 struct in6_addr *final_p = NULL, final;
1416 struct flowi fl;
1417
1418 memset(&fl, 0, sizeof(fl));
1419 fl.proto = IPPROTO_TCP;
1420 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1421 if (opt && opt->srcrt) {
1422 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1423 ipv6_addr_copy(&final, &fl.fl6_dst);
1424 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1425 final_p = &final;
1426 }
1427 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1428 fl.oif = sk->sk_bound_dev_if;
1429 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1430 fl.fl_ip_sport = inet_sk(sk)->sport;
1431 security_req_classify_flow(req, &fl);
1432
1433 if (ip6_dst_lookup(sk, &dst, &fl))
1434 goto out;
1435
1436 if (final_p)
1437 ipv6_addr_copy(&fl.fl6_dst, final_p);
1438
1439 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1440 goto out;
1441 }
1442
1443 newsk = tcp_create_openreq_child(sk, req, skb);
1444 if (newsk == NULL)
1445 goto out;
1446
1447 /*
1448 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1449 * count here, tcp_create_openreq_child now does this for us, see the
1450 * comment in that function for the gory details. -acme
1451 */
1452
1453 newsk->sk_gso_type = SKB_GSO_TCPV6;
1454 __ip6_dst_store(newsk, dst, NULL, NULL);
1455
1456 newtcp6sk = (struct tcp6_sock *)newsk;
1457 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1458
1459 newtp = tcp_sk(newsk);
1460 newinet = inet_sk(newsk);
1461 newnp = inet6_sk(newsk);
1462
1463 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1464
1465 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1466 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1467 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1468 newsk->sk_bound_dev_if = treq->iif;
1469
1470 /* Now IPv6 options...
1471
1472 First: no IPv4 options.
1473 */
1474 newinet->opt = NULL;
1475 newnp->ipv6_fl_list = NULL;
1476
1477 /* Clone RX bits */
1478 newnp->rxopt.all = np->rxopt.all;
1479
1480 /* Clone pktoptions received with SYN */
1481 newnp->pktoptions = NULL;
1482 if (treq->pktopts != NULL) {
1483 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1484 kfree_skb(treq->pktopts);
1485 treq->pktopts = NULL;
1486 if (newnp->pktoptions)
1487 skb_set_owner_r(newnp->pktoptions, newsk);
1488 }
1489 newnp->opt = NULL;
1490 newnp->mcast_oif = inet6_iif(skb);
1491 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1492
1493 /* Clone native IPv6 options from listening socket (if any)
1494
1495 Yes, keeping reference count would be much more clever,
1496 but we make one more one thing there: reattach optmem
1497 to newsk.
1498 */
1499 if (opt) {
1500 newnp->opt = ipv6_dup_options(newsk, opt);
1501 if (opt != np->opt)
1502 sock_kfree_s(sk, opt, opt->tot_len);
1503 }
1504
1505 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1506 if (newnp->opt)
1507 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1508 newnp->opt->opt_flen);
1509
1510 tcp_mtup_init(newsk);
1511 tcp_sync_mss(newsk, dst_mtu(dst));
1512 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1513 tcp_initialize_rcv_mss(newsk);
1514
1515 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1516
1517 #ifdef CONFIG_TCP_MD5SIG
1518 /* Copy over the MD5 key from the original socket */
1519 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1520 /* We're using one, so create a matching key
1521 * on the newsk structure. If we fail to get
1522 * memory, then we end up not copying the key
1523 * across. Shucks.
1524 */
1525 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1526 if (newkey != NULL)
1527 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1528 newkey, key->keylen);
1529 }
1530 #endif
1531
1532 __inet6_hash(newsk);
1533 inet_inherit_port(sk, newsk);
1534
1535 return newsk;
1536
1537 out_overflow:
1538 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
1539 out:
1540 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
1541 if (opt && opt != np->opt)
1542 sock_kfree_s(sk, opt, opt->tot_len);
1543 dst_release(dst);
1544 return NULL;
1545 }
1546
1547 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1548 {
1549 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1550 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
1551 &ipv6_hdr(skb)->daddr, skb->csum)) {
1552 skb->ip_summed = CHECKSUM_UNNECESSARY;
1553 return 0;
1554 }
1555 }
1556
1557 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
1558 &ipv6_hdr(skb)->saddr,
1559 &ipv6_hdr(skb)->daddr, 0));
1560
1561 if (skb->len <= 76) {
1562 return __skb_checksum_complete(skb);
1563 }
1564 return 0;
1565 }
1566
1567 /* The socket must have it's spinlock held when we get
1568 * here.
1569 *
1570 * We have a potential double-lock case here, so even when
1571 * doing backlog processing we use the BH locking scheme.
1572 * This is because we cannot sleep with the original spinlock
1573 * held.
1574 */
1575 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1576 {
1577 struct ipv6_pinfo *np = inet6_sk(sk);
1578 struct tcp_sock *tp;
1579 struct sk_buff *opt_skb = NULL;
1580
1581 /* Imagine: socket is IPv6. IPv4 packet arrives,
1582 goes to IPv4 receive handler and backlogged.
1583 From backlog it always goes here. Kerboom...
1584 Fortunately, tcp_rcv_established and rcv_established
1585 handle them correctly, but it is not case with
1586 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1587 */
1588
1589 if (skb->protocol == htons(ETH_P_IP))
1590 return tcp_v4_do_rcv(sk, skb);
1591
1592 #ifdef CONFIG_TCP_MD5SIG
1593 if (tcp_v6_inbound_md5_hash (sk, skb))
1594 goto discard;
1595 #endif
1596
1597 if (sk_filter(sk, skb))
1598 goto discard;
1599
1600 /*
1601 * socket locking is here for SMP purposes as backlog rcv
1602 * is currently called with bh processing disabled.
1603 */
1604
1605 /* Do Stevens' IPV6_PKTOPTIONS.
1606
1607 Yes, guys, it is the only place in our code, where we
1608 may make it not affecting IPv4.
1609 The rest of code is protocol independent,
1610 and I do not like idea to uglify IPv4.
1611
1612 Actually, all the idea behind IPV6_PKTOPTIONS
1613 looks not very well thought. For now we latch
1614 options, received in the last packet, enqueued
1615 by tcp. Feel free to propose better solution.
1616 --ANK (980728)
1617 */
1618 if (np->rxopt.all)
1619 opt_skb = skb_clone(skb, GFP_ATOMIC);
1620
1621 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1622 TCP_CHECK_TIMER(sk);
1623 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1624 goto reset;
1625 TCP_CHECK_TIMER(sk);
1626 if (opt_skb)
1627 goto ipv6_pktoptions;
1628 return 0;
1629 }
1630
1631 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1632 goto csum_err;
1633
1634 if (sk->sk_state == TCP_LISTEN) {
1635 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1636 if (!nsk)
1637 goto discard;
1638
1639 /*
1640 * Queue it on the new socket if the new socket is active,
1641 * otherwise we just shortcircuit this and continue with
1642 * the new socket..
1643 */
1644 if(nsk != sk) {
1645 if (tcp_child_process(sk, nsk, skb))
1646 goto reset;
1647 if (opt_skb)
1648 __kfree_skb(opt_skb);
1649 return 0;
1650 }
1651 }
1652
1653 TCP_CHECK_TIMER(sk);
1654 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1655 goto reset;
1656 TCP_CHECK_TIMER(sk);
1657 if (opt_skb)
1658 goto ipv6_pktoptions;
1659 return 0;
1660
1661 reset:
1662 tcp_v6_send_reset(sk, skb);
1663 discard:
1664 if (opt_skb)
1665 __kfree_skb(opt_skb);
1666 kfree_skb(skb);
1667 return 0;
1668 csum_err:
1669 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1670 goto discard;
1671
1672
1673 ipv6_pktoptions:
1674 /* Do you ask, what is it?
1675
1676 1. skb was enqueued by tcp.
1677 2. skb is added to tail of read queue, rather than out of order.
1678 3. socket is not in passive state.
1679 4. Finally, it really contains options, which user wants to receive.
1680 */
1681 tp = tcp_sk(sk);
1682 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1683 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1684 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1685 np->mcast_oif = inet6_iif(opt_skb);
1686 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1687 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1688 if (ipv6_opt_accepted(sk, opt_skb)) {
1689 skb_set_owner_r(opt_skb, sk);
1690 opt_skb = xchg(&np->pktoptions, opt_skb);
1691 } else {
1692 __kfree_skb(opt_skb);
1693 opt_skb = xchg(&np->pktoptions, NULL);
1694 }
1695 }
1696
1697 if (opt_skb)
1698 kfree_skb(opt_skb);
1699 return 0;
1700 }
1701
1702 static int tcp_v6_rcv(struct sk_buff *skb)
1703 {
1704 struct tcphdr *th;
1705 struct sock *sk;
1706 int ret;
1707
1708 if (skb->pkt_type != PACKET_HOST)
1709 goto discard_it;
1710
1711 /*
1712 * Count it even if it's bad.
1713 */
1714 TCP_INC_STATS_BH(TCP_MIB_INSEGS);
1715
1716 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1717 goto discard_it;
1718
1719 th = tcp_hdr(skb);
1720
1721 if (th->doff < sizeof(struct tcphdr)/4)
1722 goto bad_packet;
1723 if (!pskb_may_pull(skb, th->doff*4))
1724 goto discard_it;
1725
1726 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1727 goto bad_packet;
1728
1729 th = tcp_hdr(skb);
1730 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1731 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1732 skb->len - th->doff*4);
1733 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1734 TCP_SKB_CB(skb)->when = 0;
1735 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1736 TCP_SKB_CB(skb)->sacked = 0;
1737
1738 sk = __inet6_lookup(skb->dev->nd_net, &tcp_hashinfo,
1739 &ipv6_hdr(skb)->saddr, th->source,
1740 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
1741 inet6_iif(skb));
1742
1743 if (!sk)
1744 goto no_tcp_socket;
1745
1746 process:
1747 if (sk->sk_state == TCP_TIME_WAIT)
1748 goto do_time_wait;
1749
1750 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1751 goto discard_and_relse;
1752
1753 if (sk_filter(sk, skb))
1754 goto discard_and_relse;
1755
1756 skb->dev = NULL;
1757
1758 bh_lock_sock_nested(sk);
1759 ret = 0;
1760 if (!sock_owned_by_user(sk)) {
1761 #ifdef CONFIG_NET_DMA
1762 struct tcp_sock *tp = tcp_sk(sk);
1763 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1764 tp->ucopy.dma_chan = get_softnet_dma();
1765 if (tp->ucopy.dma_chan)
1766 ret = tcp_v6_do_rcv(sk, skb);
1767 else
1768 #endif
1769 {
1770 if (!tcp_prequeue(sk, skb))
1771 ret = tcp_v6_do_rcv(sk, skb);
1772 }
1773 } else
1774 sk_add_backlog(sk, skb);
1775 bh_unlock_sock(sk);
1776
1777 sock_put(sk);
1778 return ret ? -1 : 0;
1779
1780 no_tcp_socket:
1781 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1782 goto discard_it;
1783
1784 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1785 bad_packet:
1786 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1787 } else {
1788 tcp_v6_send_reset(NULL, skb);
1789 }
1790
1791 discard_it:
1792
1793 /*
1794 * Discard frame
1795 */
1796
1797 kfree_skb(skb);
1798 return 0;
1799
1800 discard_and_relse:
1801 sock_put(sk);
1802 goto discard_it;
1803
1804 do_time_wait:
1805 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1806 inet_twsk_put(inet_twsk(sk));
1807 goto discard_it;
1808 }
1809
1810 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1811 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1812 inet_twsk_put(inet_twsk(sk));
1813 goto discard_it;
1814 }
1815
1816 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1817 case TCP_TW_SYN:
1818 {
1819 struct sock *sk2;
1820
1821 sk2 = inet6_lookup_listener(skb->dev->nd_net, &tcp_hashinfo,
1822 &ipv6_hdr(skb)->daddr,
1823 ntohs(th->dest), inet6_iif(skb));
1824 if (sk2 != NULL) {
1825 struct inet_timewait_sock *tw = inet_twsk(sk);
1826 inet_twsk_deschedule(tw, &tcp_death_row);
1827 inet_twsk_put(tw);
1828 sk = sk2;
1829 goto process;
1830 }
1831 /* Fall through to ACK */
1832 }
1833 case TCP_TW_ACK:
1834 tcp_v6_timewait_ack(sk, skb);
1835 break;
1836 case TCP_TW_RST:
1837 goto no_tcp_socket;
1838 case TCP_TW_SUCCESS:;
1839 }
1840 goto discard_it;
1841 }
1842
1843 static int tcp_v6_remember_stamp(struct sock *sk)
1844 {
1845 /* Alas, not yet... */
1846 return 0;
1847 }
1848
1849 static struct inet_connection_sock_af_ops ipv6_specific = {
1850 .queue_xmit = inet6_csk_xmit,
1851 .send_check = tcp_v6_send_check,
1852 .rebuild_header = inet6_sk_rebuild_header,
1853 .conn_request = tcp_v6_conn_request,
1854 .syn_recv_sock = tcp_v6_syn_recv_sock,
1855 .remember_stamp = tcp_v6_remember_stamp,
1856 .net_header_len = sizeof(struct ipv6hdr),
1857 .setsockopt = ipv6_setsockopt,
1858 .getsockopt = ipv6_getsockopt,
1859 .addr2sockaddr = inet6_csk_addr2sockaddr,
1860 .sockaddr_len = sizeof(struct sockaddr_in6),
1861 .bind_conflict = inet6_csk_bind_conflict,
1862 #ifdef CONFIG_COMPAT
1863 .compat_setsockopt = compat_ipv6_setsockopt,
1864 .compat_getsockopt = compat_ipv6_getsockopt,
1865 #endif
1866 };
1867
1868 #ifdef CONFIG_TCP_MD5SIG
1869 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1870 .md5_lookup = tcp_v6_md5_lookup,
1871 .calc_md5_hash = tcp_v6_calc_md5_hash,
1872 .md5_add = tcp_v6_md5_add_func,
1873 .md5_parse = tcp_v6_parse_md5_keys,
1874 };
1875 #endif
1876
1877 /*
1878 * TCP over IPv4 via INET6 API
1879 */
1880
1881 static struct inet_connection_sock_af_ops ipv6_mapped = {
1882 .queue_xmit = ip_queue_xmit,
1883 .send_check = tcp_v4_send_check,
1884 .rebuild_header = inet_sk_rebuild_header,
1885 .conn_request = tcp_v6_conn_request,
1886 .syn_recv_sock = tcp_v6_syn_recv_sock,
1887 .remember_stamp = tcp_v4_remember_stamp,
1888 .net_header_len = sizeof(struct iphdr),
1889 .setsockopt = ipv6_setsockopt,
1890 .getsockopt = ipv6_getsockopt,
1891 .addr2sockaddr = inet6_csk_addr2sockaddr,
1892 .sockaddr_len = sizeof(struct sockaddr_in6),
1893 .bind_conflict = inet6_csk_bind_conflict,
1894 #ifdef CONFIG_COMPAT
1895 .compat_setsockopt = compat_ipv6_setsockopt,
1896 .compat_getsockopt = compat_ipv6_getsockopt,
1897 #endif
1898 };
1899
1900 #ifdef CONFIG_TCP_MD5SIG
1901 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1902 .md5_lookup = tcp_v4_md5_lookup,
1903 .calc_md5_hash = tcp_v4_calc_md5_hash,
1904 .md5_add = tcp_v6_md5_add_func,
1905 .md5_parse = tcp_v6_parse_md5_keys,
1906 };
1907 #endif
1908
1909 /* NOTE: A lot of things set to zero explicitly by call to
1910 * sk_alloc() so need not be done here.
1911 */
1912 static int tcp_v6_init_sock(struct sock *sk)
1913 {
1914 struct inet_connection_sock *icsk = inet_csk(sk);
1915 struct tcp_sock *tp = tcp_sk(sk);
1916
1917 skb_queue_head_init(&tp->out_of_order_queue);
1918 tcp_init_xmit_timers(sk);
1919 tcp_prequeue_init(tp);
1920
1921 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1922 tp->mdev = TCP_TIMEOUT_INIT;
1923
1924 /* So many TCP implementations out there (incorrectly) count the
1925 * initial SYN frame in their delayed-ACK and congestion control
1926 * algorithms that we must have the following bandaid to talk
1927 * efficiently to them. -DaveM
1928 */
1929 tp->snd_cwnd = 2;
1930
1931 /* See draft-stevens-tcpca-spec-01 for discussion of the
1932 * initialization of these values.
1933 */
1934 tp->snd_ssthresh = 0x7fffffff;
1935 tp->snd_cwnd_clamp = ~0;
1936 tp->mss_cache = 536;
1937
1938 tp->reordering = sysctl_tcp_reordering;
1939
1940 sk->sk_state = TCP_CLOSE;
1941
1942 icsk->icsk_af_ops = &ipv6_specific;
1943 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1944 icsk->icsk_sync_mss = tcp_sync_mss;
1945 sk->sk_write_space = sk_stream_write_space;
1946 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1947
1948 #ifdef CONFIG_TCP_MD5SIG
1949 tp->af_specific = &tcp_sock_ipv6_specific;
1950 #endif
1951
1952 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1953 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1954
1955 atomic_inc(&tcp_sockets_allocated);
1956
1957 return 0;
1958 }
1959
1960 static int tcp_v6_destroy_sock(struct sock *sk)
1961 {
1962 #ifdef CONFIG_TCP_MD5SIG
1963 /* Clean up the MD5 key list */
1964 if (tcp_sk(sk)->md5sig_info)
1965 tcp_v6_clear_md5_list(sk);
1966 #endif
1967 tcp_v4_destroy_sock(sk);
1968 return inet6_destroy_sock(sk);
1969 }
1970
1971 #ifdef CONFIG_PROC_FS
1972 /* Proc filesystem TCPv6 sock list dumping. */
1973 static void get_openreq6(struct seq_file *seq,
1974 struct sock *sk, struct request_sock *req, int i, int uid)
1975 {
1976 int ttd = req->expires - jiffies;
1977 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1978 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1979
1980 if (ttd < 0)
1981 ttd = 0;
1982
1983 seq_printf(seq,
1984 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1985 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1986 i,
1987 src->s6_addr32[0], src->s6_addr32[1],
1988 src->s6_addr32[2], src->s6_addr32[3],
1989 ntohs(inet_sk(sk)->sport),
1990 dest->s6_addr32[0], dest->s6_addr32[1],
1991 dest->s6_addr32[2], dest->s6_addr32[3],
1992 ntohs(inet_rsk(req)->rmt_port),
1993 TCP_SYN_RECV,
1994 0,0, /* could print option size, but that is af dependent. */
1995 1, /* timers active (only the expire timer) */
1996 jiffies_to_clock_t(ttd),
1997 req->retrans,
1998 uid,
1999 0, /* non standard timer */
2000 0, /* open_requests have no inode */
2001 0, req);
2002 }
2003
2004 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
2005 {
2006 struct in6_addr *dest, *src;
2007 __u16 destp, srcp;
2008 int timer_active;
2009 unsigned long timer_expires;
2010 struct inet_sock *inet = inet_sk(sp);
2011 struct tcp_sock *tp = tcp_sk(sp);
2012 const struct inet_connection_sock *icsk = inet_csk(sp);
2013 struct ipv6_pinfo *np = inet6_sk(sp);
2014
2015 dest = &np->daddr;
2016 src = &np->rcv_saddr;
2017 destp = ntohs(inet->dport);
2018 srcp = ntohs(inet->sport);
2019
2020 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
2021 timer_active = 1;
2022 timer_expires = icsk->icsk_timeout;
2023 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
2024 timer_active = 4;
2025 timer_expires = icsk->icsk_timeout;
2026 } else if (timer_pending(&sp->sk_timer)) {
2027 timer_active = 2;
2028 timer_expires = sp->sk_timer.expires;
2029 } else {
2030 timer_active = 0;
2031 timer_expires = jiffies;
2032 }
2033
2034 seq_printf(seq,
2035 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2036 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
2037 i,
2038 src->s6_addr32[0], src->s6_addr32[1],
2039 src->s6_addr32[2], src->s6_addr32[3], srcp,
2040 dest->s6_addr32[0], dest->s6_addr32[1],
2041 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2042 sp->sk_state,
2043 tp->write_seq-tp->snd_una,
2044 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
2045 timer_active,
2046 jiffies_to_clock_t(timer_expires - jiffies),
2047 icsk->icsk_retransmits,
2048 sock_i_uid(sp),
2049 icsk->icsk_probes_out,
2050 sock_i_ino(sp),
2051 atomic_read(&sp->sk_refcnt), sp,
2052 icsk->icsk_rto,
2053 icsk->icsk_ack.ato,
2054 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
2055 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
2056 );
2057 }
2058
2059 static void get_timewait6_sock(struct seq_file *seq,
2060 struct inet_timewait_sock *tw, int i)
2061 {
2062 struct in6_addr *dest, *src;
2063 __u16 destp, srcp;
2064 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
2065 int ttd = tw->tw_ttd - jiffies;
2066
2067 if (ttd < 0)
2068 ttd = 0;
2069
2070 dest = &tw6->tw_v6_daddr;
2071 src = &tw6->tw_v6_rcv_saddr;
2072 destp = ntohs(tw->tw_dport);
2073 srcp = ntohs(tw->tw_sport);
2074
2075 seq_printf(seq,
2076 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2077 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
2078 i,
2079 src->s6_addr32[0], src->s6_addr32[1],
2080 src->s6_addr32[2], src->s6_addr32[3], srcp,
2081 dest->s6_addr32[0], dest->s6_addr32[1],
2082 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2083 tw->tw_substate, 0, 0,
2084 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2085 atomic_read(&tw->tw_refcnt), tw);
2086 }
2087
2088 static int tcp6_seq_show(struct seq_file *seq, void *v)
2089 {
2090 struct tcp_iter_state *st;
2091
2092 if (v == SEQ_START_TOKEN) {
2093 seq_puts(seq,
2094 " sl "
2095 "local_address "
2096 "remote_address "
2097 "st tx_queue rx_queue tr tm->when retrnsmt"
2098 " uid timeout inode\n");
2099 goto out;
2100 }
2101 st = seq->private;
2102
2103 switch (st->state) {
2104 case TCP_SEQ_STATE_LISTENING:
2105 case TCP_SEQ_STATE_ESTABLISHED:
2106 get_tcp6_sock(seq, v, st->num);
2107 break;
2108 case TCP_SEQ_STATE_OPENREQ:
2109 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2110 break;
2111 case TCP_SEQ_STATE_TIME_WAIT:
2112 get_timewait6_sock(seq, v, st->num);
2113 break;
2114 }
2115 out:
2116 return 0;
2117 }
2118
2119 static struct file_operations tcp6_seq_fops;
2120 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2121 .owner = THIS_MODULE,
2122 .name = "tcp6",
2123 .family = AF_INET6,
2124 .seq_show = tcp6_seq_show,
2125 .seq_fops = &tcp6_seq_fops,
2126 };
2127
2128 int __init tcp6_proc_init(void)
2129 {
2130 return tcp_proc_register(&tcp6_seq_afinfo);
2131 }
2132
2133 void tcp6_proc_exit(void)
2134 {
2135 tcp_proc_unregister(&tcp6_seq_afinfo);
2136 }
2137 #endif
2138
2139 DEFINE_PROTO_INUSE(tcpv6)
2140
2141 struct proto tcpv6_prot = {
2142 .name = "TCPv6",
2143 .owner = THIS_MODULE,
2144 .close = tcp_close,
2145 .connect = tcp_v6_connect,
2146 .disconnect = tcp_disconnect,
2147 .accept = inet_csk_accept,
2148 .ioctl = tcp_ioctl,
2149 .init = tcp_v6_init_sock,
2150 .destroy = tcp_v6_destroy_sock,
2151 .shutdown = tcp_shutdown,
2152 .setsockopt = tcp_setsockopt,
2153 .getsockopt = tcp_getsockopt,
2154 .recvmsg = tcp_recvmsg,
2155 .backlog_rcv = tcp_v6_do_rcv,
2156 .hash = tcp_v6_hash,
2157 .unhash = inet_unhash,
2158 .get_port = inet_csk_get_port,
2159 .enter_memory_pressure = tcp_enter_memory_pressure,
2160 .sockets_allocated = &tcp_sockets_allocated,
2161 .memory_allocated = &tcp_memory_allocated,
2162 .memory_pressure = &tcp_memory_pressure,
2163 .orphan_count = &tcp_orphan_count,
2164 .sysctl_mem = sysctl_tcp_mem,
2165 .sysctl_wmem = sysctl_tcp_wmem,
2166 .sysctl_rmem = sysctl_tcp_rmem,
2167 .max_header = MAX_TCP_HEADER,
2168 .obj_size = sizeof(struct tcp6_sock),
2169 .twsk_prot = &tcp6_timewait_sock_ops,
2170 .rsk_prot = &tcp6_request_sock_ops,
2171 .hashinfo = &tcp_hashinfo,
2172 #ifdef CONFIG_COMPAT
2173 .compat_setsockopt = compat_tcp_setsockopt,
2174 .compat_getsockopt = compat_tcp_getsockopt,
2175 #endif
2176 REF_PROTO_INUSE(tcpv6)
2177 };
2178
2179 static struct inet6_protocol tcpv6_protocol = {
2180 .handler = tcp_v6_rcv,
2181 .err_handler = tcp_v6_err,
2182 .gso_send_check = tcp_v6_gso_send_check,
2183 .gso_segment = tcp_tso_segment,
2184 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2185 };
2186
2187 static struct inet_protosw tcpv6_protosw = {
2188 .type = SOCK_STREAM,
2189 .protocol = IPPROTO_TCP,
2190 .prot = &tcpv6_prot,
2191 .ops = &inet6_stream_ops,
2192 .capability = -1,
2193 .no_check = 0,
2194 .flags = INET_PROTOSW_PERMANENT |
2195 INET_PROTOSW_ICSK,
2196 };
2197
2198 int __init tcpv6_init(void)
2199 {
2200 int ret;
2201
2202 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2203 if (ret)
2204 goto out;
2205
2206 /* register inet6 protocol */
2207 ret = inet6_register_protosw(&tcpv6_protosw);
2208 if (ret)
2209 goto out_tcpv6_protocol;
2210
2211 ret = inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6,
2212 SOCK_RAW, IPPROTO_TCP);
2213 if (ret)
2214 goto out_tcpv6_protosw;
2215 out:
2216 return ret;
2217
2218 out_tcpv6_protocol:
2219 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2220 out_tcpv6_protosw:
2221 inet6_unregister_protosw(&tcpv6_protosw);
2222 goto out;
2223 }
2224
2225 void tcpv6_exit(void)
2226 {
2227 sock_release(tcp6_socket);
2228 inet6_unregister_protosw(&tcpv6_protosw);
2229 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2230 }
Linux kernel - Deliverables
This page took 0.086707 seconds and 5 git commands to generate.