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Import 2.3.99pre6-6
[davej-history.git] / net / ipv6 / tcp_ipv6.c
blob342b9c6d2ba52e4177c182679b9f0f00786d0c18
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 1.122 2000/03/25 01:52:11 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 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #define __NO_VERSION__
25 #include <linux/module.h>
26 #include <linux/config.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/sched.h>
33 #include <linux/in.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/init.h>
37 #include <linux/ipsec.h>
38
39 #include <linux/ipv6.h>
40 #include <linux/icmpv6.h>
41 #include <linux/random.h>
42
43 #include <net/tcp.h>
44 #include <net/ndisc.h>
45 #include <net/ipv6.h>
46 #include <net/transp_v6.h>
47 #include <net/addrconf.h>
48 #include <net/ip6_route.h>
49
50 #include <asm/uaccess.h>
51
52 static void tcp_v6_send_reset(struct sk_buff *skb);
53 static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req);
54 static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
55 struct sk_buff *skb);
56
57 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
58 static int tcp_v6_xmit(struct sk_buff *skb);
59
60 static struct tcp_func ipv6_mapped;
61 static struct tcp_func ipv6_specific;
62
63 /* I have no idea if this is a good hash for v6 or not. -DaveM */
64 static __inline__ int tcp_v6_hashfn(struct in6_addr *laddr, u16 lport,
65 struct in6_addr *faddr, u16 fport)
66 {
67 int hashent = (lport ^ fport);
68
69 hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
70 hashent ^= hashent>>16;
71 hashent ^= hashent>>8;
72 return (hashent & (tcp_ehash_size - 1));
73 }
74
75 static __inline__ int tcp_v6_sk_hashfn(struct sock *sk)
76 {
77 struct in6_addr *laddr = &sk->net_pinfo.af_inet6.rcv_saddr;
78 struct in6_addr *faddr = &sk->net_pinfo.af_inet6.daddr;
79 __u16 lport = sk->num;
80 __u16 fport = sk->dport;
81 return tcp_v6_hashfn(laddr, lport, faddr, fport);
82 }
83
84 /* Grrr, addr_type already calculated by caller, but I don't want
85 * to add some silly "cookie" argument to this method just for that.
86 * But it doesn't matter, the recalculation is in the rarest path
87 * this function ever takes.
88 */
89 static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
90 {
91 struct tcp_bind_hashbucket *head;
92 struct tcp_bind_bucket *tb;
93 int ret;
94
95 local_bh_disable();
96 if (snum == 0) {
97 int low = sysctl_local_port_range[0];
98 int high = sysctl_local_port_range[1];
99 int remaining = (high - low) + 1;
100 int rover;
101
102 spin_lock(&tcp_portalloc_lock);
103 rover = tcp_port_rover;
104 do { rover++;
105 if ((rover < low) || (rover > high))
106 rover = low;
107 head = &tcp_bhash[tcp_bhashfn(rover)];
108 spin_lock(&head->lock);
109 for (tb = head->chain; tb; tb = tb->next)
110 if (tb->port == rover)
111 goto next;
112 break;
113 next:
114 spin_unlock(&head->lock);
115 } while (--remaining > 0);
116 tcp_port_rover = rover;
117 spin_unlock(&tcp_portalloc_lock);
118
119 /* Exhausted local port range during search? */
120 ret = 1;
121 if (remaining <= 0)
122 goto fail;
123
124 /* OK, here is the one we will use. */
125 snum = rover;
126 tb = NULL;
127 } else {
128 head = &tcp_bhash[tcp_bhashfn(snum)];
129 spin_lock(&head->lock);
130 for (tb = head->chain; tb != NULL; tb = tb->next)
131 if (tb->port == snum)
132 break;
133 }
134 if (tb != NULL && tb->owners != NULL) {
135 if (tb->fastreuse != 0 && sk->reuse != 0 && sk->state != TCP_LISTEN) {
136 goto success;
137 } else {
138 struct sock *sk2 = tb->owners;
139 int sk_reuse = sk->reuse;
140 int addr_type = ipv6_addr_type(&sk->net_pinfo.af_inet6.rcv_saddr);
141
142 /* We must walk the whole port owner list in this case. -DaveM */
143 for( ; sk2 != NULL; sk2 = sk2->bind_next) {
144 if (sk != sk2 &&
145 sk->bound_dev_if == sk2->bound_dev_if) {
146 if (!sk_reuse ||
147 !sk2->reuse ||
148 sk2->state == TCP_LISTEN) {
149 /* NOTE: IPv6 tw bucket have different format */
150 if (!sk2->rcv_saddr ||
151 addr_type == IPV6_ADDR_ANY ||
152 !ipv6_addr_cmp(&sk->net_pinfo.af_inet6.rcv_saddr,
153 sk2->state != TCP_TIME_WAIT ?
154 &sk2->net_pinfo.af_inet6.rcv_saddr :
155 &((struct tcp_tw_bucket*)sk)->v6_rcv_saddr))
156 break;
157 }
158 }
159 }
160 /* If we found a conflict, fail. */
161 ret = 1;
162 if (sk2 != NULL)
163 goto fail_unlock;
164 }
165 }
166 ret = 1;
167 if (tb == NULL &&
168 (tb = tcp_bucket_create(head, snum)) == NULL)
169 goto fail_unlock;
170 if (tb->owners == NULL) {
171 if (sk->reuse && sk->state != TCP_LISTEN)
172 tb->fastreuse = 1;
173 else
174 tb->fastreuse = 0;
175 } else if (tb->fastreuse &&
176 ((sk->reuse == 0) || (sk->state == TCP_LISTEN)))
177 tb->fastreuse = 0;
178
179 success:
180 sk->num = snum;
181 if (sk->prev == NULL) {
182 if ((sk->bind_next = tb->owners) != NULL)
183 tb->owners->bind_pprev = &sk->bind_next;
184 tb->owners = sk;
185 sk->bind_pprev = &tb->owners;
186 sk->prev = (struct sock *) tb;
187 } else {
188 BUG_TRAP(sk->prev == (struct sock *) tb);
189 }
190 ret = 0;
191
192 fail_unlock:
193 spin_unlock(&head->lock);
194 fail:
195 local_bh_enable();
196 return ret;
197 }
198
199 static __inline__ void __tcp_v6_hash(struct sock *sk)
200 {
201 struct sock **skp;
202 rwlock_t *lock;
203
204 BUG_TRAP(sk->pprev==NULL);
205
206 if(sk->state == TCP_LISTEN) {
207 skp = &tcp_listening_hash[tcp_sk_listen_hashfn(sk)];
208 lock = &tcp_lhash_lock;
209 tcp_listen_wlock();
210 } else {
211 skp = &tcp_ehash[(sk->hashent = tcp_v6_sk_hashfn(sk))].chain;
212 lock = &tcp_ehash[sk->hashent].lock;
213 write_lock(lock);
214 }
215
216 if((sk->next = *skp) != NULL)
217 (*skp)->pprev = &sk->next;
218 *skp = sk;
219 sk->pprev = skp;
220 sock_prot_inc_use(sk->prot);
221 write_unlock(lock);
222 }
223
224
225 static void tcp_v6_hash(struct sock *sk)
226 {
227 if(sk->state != TCP_CLOSE) {
228 if (sk->tp_pinfo.af_tcp.af_specific == &ipv6_mapped) {
229 tcp_prot.hash(sk);
230 return;
231 }
232 local_bh_disable();
233 __tcp_v6_hash(sk);
234 local_bh_enable();
235 }
236 }
237
238 static struct sock *tcp_v6_lookup_listener(struct in6_addr *daddr, unsigned short hnum, int dif)
239 {
240 struct sock *sk;
241 struct sock *result = NULL;
242 int score, hiscore;
243
244 hiscore=0;
245 read_lock(&tcp_lhash_lock);
246 sk = tcp_listening_hash[tcp_lhashfn(hnum)];
247 for(; sk; sk = sk->next) {
248 if((sk->num == hnum) && (sk->family == PF_INET6)) {
249 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
250
251 score = 1;
252 if(!ipv6_addr_any(&np->rcv_saddr)) {
253 if(ipv6_addr_cmp(&np->rcv_saddr, daddr))
254 continue;
255 score++;
256 }
257 if (sk->bound_dev_if) {
258 if (sk->bound_dev_if != dif)
259 continue;
260 score++;
261 }
262 if (score == 3) {
263 result = sk;
264 break;
265 }
266 if (score > hiscore) {
267 hiscore = score;
268 result = sk;
269 }
270 }
271 }
272 if (result)
273 sock_hold(result);
274 read_unlock(&tcp_lhash_lock);
275 return result;
276 }
277
278 /* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
279 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
280 *
281 * The sockhash lock must be held as a reader here.
282 */
283
284 static inline struct sock *__tcp_v6_lookup_established(struct in6_addr *saddr, u16 sport,
285 struct in6_addr *daddr, u16 hnum,
286 int dif)
287 {
288 struct tcp_ehash_bucket *head;
289 struct sock *sk;
290 __u32 ports = TCP_COMBINED_PORTS(sport, hnum);
291 int hash;
292
293 /* Optimize here for direct hit, only listening connections can
294 * have wildcards anyways.
295 */
296 hash = tcp_v6_hashfn(daddr, hnum, saddr, sport);
297 head = &tcp_ehash[hash];
298 read_lock(&head->lock);
299 for(sk = head->chain; sk; sk = sk->next) {
300 /* For IPV6 do the cheaper port and family tests first. */
301 if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif))
302 goto hit; /* You sunk my battleship! */
303 }
304 /* Must check for a TIME_WAIT'er before going to listener hash. */
305 for(sk = (head + tcp_ehash_size)->chain; sk; sk = sk->next) {
306 if(*((__u32 *)&(sk->dport)) == ports &&
307 sk->family == PF_INET6) {
308 struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
309 if(!ipv6_addr_cmp(&tw->v6_daddr, saddr) &&
310 !ipv6_addr_cmp(&tw->v6_rcv_saddr, daddr) &&
311 (!sk->bound_dev_if || sk->bound_dev_if == dif))
312 goto hit;
313 }
314 }
315 read_unlock(&head->lock);
316 return NULL;
317
318 hit:
319 sock_hold(sk);
320 read_unlock(&head->lock);
321 return sk;
322 }
323
324
325 static inline struct sock *__tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
326 struct in6_addr *daddr, u16 hnum,
327 int dif)
328 {
329 struct sock *sk;
330
331 sk = __tcp_v6_lookup_established(saddr, sport, daddr, hnum, dif);
332
333 if (sk)
334 return sk;
335
336 return tcp_v6_lookup_listener(daddr, hnum, dif);
337 }
338
339 #define tcp_v6_lookup(sa, sp, da, dp, dif) \
340 ({ struct sock *___sk; \
341 local_bh_disable(); \
342 ___sk = __tcp_v6_lookup((sa),(sp),(da),ntohs(dp),(dif)); \
343 local_bh_enable(); \
344 ___sk; \
345 })
346
347
348 /*
349 * Open request hash tables.
350 */
351
352 static __inline__ unsigned tcp_v6_synq_hash(struct in6_addr *raddr, u16 rport)
353 {
354 unsigned h = raddr->s6_addr32[3] ^ rport;
355 h ^= h>>16;
356 h ^= h>>8;
357 return h&(TCP_SYNQ_HSIZE-1);
358 }
359
360 static struct open_request *tcp_v6_search_req(struct tcp_opt *tp,
361 struct ipv6hdr *ip6h,
362 struct tcphdr *th,
363 int iif,
364 struct open_request ***prevp)
365 {
366 struct tcp_listen_opt *lopt = tp->listen_opt;
367 struct open_request *req, **prev;
368 __u16 rport = th->source;
369
370 for (prev = &lopt->syn_table[tcp_v6_synq_hash(&ip6h->saddr, rport)];
371 (req = *prev) != NULL;
372 prev = &req->dl_next) {
373 if (req->rmt_port == rport &&
374 req->class->family == AF_INET6 &&
375 !ipv6_addr_cmp(&req->af.v6_req.rmt_addr, &ip6h->saddr) &&
376 !ipv6_addr_cmp(&req->af.v6_req.loc_addr, &ip6h->daddr) &&
377 (!req->af.v6_req.iif || req->af.v6_req.iif == iif)) {
378 BUG_TRAP(req->sk == NULL);
379 *prevp = prev;
380 return req;
381 }
382 }
383
384 return NULL;
385 }
386
387 static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len,
388 struct in6_addr *saddr,
389 struct in6_addr *daddr,
390 unsigned long base)
391 {
392 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
393 }
394
395 static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
396 {
397 if (skb->protocol == __constant_htons(ETH_P_IPV6)) {
398 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
399 skb->nh.ipv6h->saddr.s6_addr32,
400 skb->h.th->dest,
401 skb->h.th->source);
402 } else {
403 return secure_tcp_sequence_number(skb->nh.iph->daddr,
404 skb->nh.iph->saddr,
405 skb->h.th->dest,
406 skb->h.th->source);
407 }
408 }
409
410 static int tcp_v6_check_established(struct sock *sk)
411 {
412 struct in6_addr *daddr = &sk->net_pinfo.af_inet6.rcv_saddr;
413 struct in6_addr *saddr = &sk->net_pinfo.af_inet6.daddr;
414 int dif = sk->bound_dev_if;
415 u32 ports = TCP_COMBINED_PORTS(sk->dport, sk->num);
416 int hash = tcp_v6_hashfn(daddr, sk->num, saddr, sk->dport);
417 struct tcp_ehash_bucket *head = &tcp_ehash[hash];
418 struct sock *sk2, **skp;
419 struct tcp_tw_bucket *tw;
420
421 write_lock(&head->lock);
422
423 for(skp = &(head + tcp_ehash_size)->chain; (sk2=*skp)!=NULL; skp = &sk2->next) {
424 tw = (struct tcp_tw_bucket*)sk2;
425
426 if(*((__u32 *)&(sk2->dport)) == ports &&
427 sk2->family == PF_INET6 &&
428 !ipv6_addr_cmp(&tw->v6_daddr, saddr) &&
429 !ipv6_addr_cmp(&tw->v6_rcv_saddr, daddr) &&
430 sk2->bound_dev_if == sk->bound_dev_if) {
431 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
432
433 if (tw->substate == TCP_TIME_WAIT &&
434 sysctl_tcp_tw_recycle && tw->ts_recent_stamp) {
435 /* See comment in tcp_ipv4.c */
436 if ((tp->write_seq = tw->snd_nxt + 2) == 0)
437 tp->write_seq = 1;
438 tp->ts_recent = tw->ts_recent;
439 tp->ts_recent_stamp = tw->ts_recent_stamp;
440 sock_hold(sk2);
441 skp = &head->chain;
442 goto unique;
443 } else
444 goto not_unique;
445 }
446 }
447 tw = NULL;
448
449 for(skp = &head->chain; (sk2=*skp)!=NULL; skp = &sk2->next) {
450 if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif))
451 goto not_unique;
452 }
453
454 unique:
455 BUG_TRAP(sk->pprev==NULL);
456 if ((sk->next = *skp) != NULL)
457 (*skp)->pprev = &sk->next;
458
459 *skp = sk;
460 sk->pprev = skp;
461 sk->hashent = hash;
462 sock_prot_inc_use(sk->prot);
463 write_unlock_bh(&head->lock);
464
465 if (tw) {
466 /* Silly. Should hash-dance instead... */
467 local_bh_disable();
468 tcp_tw_deschedule(tw);
469 tcp_timewait_kill(tw);
470 NET_INC_STATS_BH(TimeWaitRecycled);
471 local_bh_enable();
472
473 tcp_tw_put(tw);
474 }
475 return 0;
476
477 not_unique:
478 write_unlock_bh(&head->lock);
479 return -EADDRNOTAVAIL;
480 }
481
482 static int tcp_v6_hash_connecting(struct sock *sk)
483 {
484 unsigned short snum = sk->num;
485 struct tcp_bind_hashbucket *head = &tcp_bhash[tcp_bhashfn(snum)];
486 struct tcp_bind_bucket *tb = head->chain;
487
488 spin_lock_bh(&head->lock);
489
490 if (tb->owners == sk && sk->bind_next == NULL) {
491 __tcp_v6_hash(sk);
492 spin_unlock_bh(&head->lock);
493 return 0;
494 } else {
495 spin_unlock_bh(&head->lock);
496 return tcp_v6_check_established(sk);
497 }
498 }
499
500 static __inline__ int tcp_v6_iif(struct sk_buff *skb)
501 {
502 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
503 return opt->iif;
504 }
505
506 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
507 int addr_len)
508 {
509 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
510 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
511 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
512 struct in6_addr *saddr = NULL;
513 struct in6_addr saddr_buf;
514 struct flowi fl;
515 struct dst_entry *dst;
516 struct sk_buff *buff;
517 int addr_type;
518 int err;
519
520 if (addr_len < SIN6_LEN_RFC2133)
521 return -EINVAL;
522
523 if (usin->sin6_family != AF_INET6)
524 return(-EAFNOSUPPORT);
525
526 fl.fl6_flowlabel = 0;
527 if (np->sndflow) {
528 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
529 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
530 struct ip6_flowlabel *flowlabel;
531 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
532 if (flowlabel == NULL)
533 return -EINVAL;
534 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
535 fl6_sock_release(flowlabel);
536 }
537 }
538
539 /*
540 * connect() to INADDR_ANY means loopback (BSD'ism).
541 */
542
543 if(ipv6_addr_any(&usin->sin6_addr))
544 usin->sin6_addr.s6_addr[15] = 0x1;
545
546 addr_type = ipv6_addr_type(&usin->sin6_addr);
547
548 if(addr_type & IPV6_ADDR_MULTICAST)
549 return -ENETUNREACH;
550
551 if (addr_type&IPV6_ADDR_LINKLOCAL) {
552 if (addr_len >= sizeof(struct sockaddr_in6) &&
553 usin->sin6_scope_id) {
554 /* If interface is set while binding, indices
555 * must coincide.
556 */
557 if (sk->bound_dev_if &&
558 sk->bound_dev_if != usin->sin6_scope_id)
559 return -EINVAL;
560
561 sk->bound_dev_if = usin->sin6_scope_id;
562 }
563
564 /* Connect to link-local address requires an interface */
565 if (sk->bound_dev_if == 0)
566 return -EINVAL;
567 }
568
569 if (tp->ts_recent_stamp && ipv6_addr_cmp(&np->daddr, &usin->sin6_addr)) {
570 tp->ts_recent = 0;
571 tp->ts_recent_stamp = 0;
572 tp->write_seq = 0;
573 }
574
575 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
576 np->flow_label = fl.fl6_flowlabel;
577
578 /*
579 * TCP over IPv4
580 */
581
582 if (addr_type == IPV6_ADDR_MAPPED) {
583 u32 exthdrlen = tp->ext_header_len;
584 struct sockaddr_in sin;
585
586 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
587
588 sin.sin_family = AF_INET;
589 sin.sin_port = usin->sin6_port;
590 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
591
592 sk->tp_pinfo.af_tcp.af_specific = &ipv6_mapped;
593 sk->backlog_rcv = tcp_v4_do_rcv;
594
595 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
596
597 if (err) {
598 tp->ext_header_len = exthdrlen;
599 sk->tp_pinfo.af_tcp.af_specific = &ipv6_specific;
600 sk->backlog_rcv = tcp_v6_do_rcv;
601 goto failure;
602 } else {
603 ipv6_addr_set(&np->saddr, 0, 0, __constant_htonl(0x0000FFFF),
604 sk->saddr);
605 ipv6_addr_set(&np->rcv_saddr, 0, 0, __constant_htonl(0x0000FFFF),
606 sk->rcv_saddr);
607 }
608
609 return err;
610 }
611
612 if (!ipv6_addr_any(&np->rcv_saddr))
613 saddr = &np->rcv_saddr;
614
615 fl.proto = IPPROTO_TCP;
616 fl.fl6_dst = &np->daddr;
617 fl.fl6_src = saddr;
618 fl.oif = sk->bound_dev_if;
619 fl.uli_u.ports.dport = usin->sin6_port;
620 fl.uli_u.ports.sport = sk->sport;
621
622 if (np->opt && np->opt->srcrt) {
623 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
624 fl.nl_u.ip6_u.daddr = rt0->addr;
625 }
626
627 dst = ip6_route_output(sk, &fl);
628
629 if ((err = dst->error) != 0) {
630 dst_release(dst);
631 goto failure;
632 }
633
634 ip6_dst_store(sk, dst, NULL);
635
636 if (saddr == NULL) {
637 err = ipv6_get_saddr(dst, &np->daddr, &saddr_buf);
638 if (err)
639 goto failure;
640
641 saddr = &saddr_buf;
642 }
643
644 /* set the source address */
645 ipv6_addr_copy(&np->rcv_saddr, saddr);
646 ipv6_addr_copy(&np->saddr, saddr);
647
648 tp->ext_header_len = 0;
649 if (np->opt)
650 tp->ext_header_len = np->opt->opt_flen+np->opt->opt_nflen;
651 tp->mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
652
653 err = -ENOBUFS;
654 buff = sock_wmalloc(sk, MAX_TCP_HEADER + 15, 0, GFP_KERNEL);
655
656 if (buff == NULL)
657 goto failure;
658
659 sk->dport = usin->sin6_port;
660
661 /*
662 * Init variables
663 */
664
665 if (!tp->write_seq)
666 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
667 np->daddr.s6_addr32,
668 sk->sport, sk->dport);
669
670 err = tcp_connect(sk, buff);
671 if (err == 0)
672 return 0;
673
674 failure:
675 __sk_dst_reset(sk);
676 sk->dport = 0;
677 return err;
678 }
679
680 void tcp_v6_err(struct sk_buff *skb, struct ipv6hdr *hdr,
681 struct inet6_skb_parm *opt,
682 int type, int code, unsigned char *header, __u32 info)
683 {
684 struct in6_addr *saddr = &hdr->saddr;
685 struct in6_addr *daddr = &hdr->daddr;
686 struct tcphdr *th = (struct tcphdr *)header;
687 struct ipv6_pinfo *np;
688 struct sock *sk;
689 int err;
690 struct tcp_opt *tp;
691 __u32 seq;
692
693 if (header + 8 > skb->tail)
694 return;
695
696 sk = tcp_v6_lookup(daddr, th->dest, saddr, th->source, skb->dev->ifindex);
697
698 if (sk == NULL) {
699 ICMP6_INC_STATS_BH(Icmp6InErrors);
700 return;
701 }
702
703 if (sk->state == TCP_TIME_WAIT) {
704 tcp_tw_put((struct tcp_tw_bucket*)sk);
705 return;
706 }
707
708 bh_lock_sock(sk);
709 if (sk->lock.users)
710 NET_INC_STATS_BH(LockDroppedIcmps);
711
712 if (sk->state == TCP_CLOSE)
713 goto out;
714
715 tp = &sk->tp_pinfo.af_tcp;
716 seq = ntohl(th->seq);
717 if (sk->state != TCP_LISTEN && !between(seq, tp->snd_una, tp->snd_nxt)) {
718 NET_INC_STATS_BH(OutOfWindowIcmps);
719 goto out;
720 }
721
722 np = &sk->net_pinfo.af_inet6;
723
724 if (type == ICMPV6_PKT_TOOBIG) {
725 struct dst_entry *dst = NULL;
726
727 if (sk->lock.users)
728 goto out;
729 if ((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
730 goto out;
731
732 /* icmp should have updated the destination cache entry */
733 dst = __sk_dst_check(sk, np->dst_cookie);
734
735 if (dst == NULL) {
736 struct flowi fl;
737
738 /* BUGGG_FUTURE: Again, it is not clear how
739 to handle rthdr case. Ignore this complexity
740 for now.
741 */
742 fl.proto = IPPROTO_TCP;
743 fl.nl_u.ip6_u.daddr = &np->daddr;
744 fl.nl_u.ip6_u.saddr = &np->saddr;
745 fl.oif = sk->bound_dev_if;
746 fl.uli_u.ports.dport = sk->dport;
747 fl.uli_u.ports.sport = sk->sport;
748
749 dst = ip6_route_output(sk, &fl);
750 } else
751 dst_clone(dst);
752
753 if (dst->error) {
754 sk->err_soft = -dst->error;
755 } else if (tp->pmtu_cookie > dst->pmtu) {
756 tcp_sync_mss(sk, dst->pmtu);
757 tcp_simple_retransmit(sk);
758 } /* else let the usual retransmit timer handle it */
759 dst_release(dst);
760 goto out;
761 }
762
763 icmpv6_err_convert(type, code, &err);
764
765 /* Might be for an open_request */
766 switch (sk->state) {
767 struct open_request *req, **prev;
768 struct ipv6hdr hd;
769 case TCP_LISTEN:
770 if (sk->lock.users)
771 goto out;
772
773 /* Grrrr - fix this later. */
774 ipv6_addr_copy(&hd.saddr, saddr);
775 ipv6_addr_copy(&hd.daddr, daddr);
776 req = tcp_v6_search_req(tp, &hd, th, tcp_v6_iif(skb), &prev);
777 if (!req)
778 goto out;
779
780 /* ICMPs are not backlogged, hence we cannot get
781 * an established socket here.
782 */
783 BUG_TRAP(req->sk == NULL);
784
785 if (seq != req->snt_isn) {
786 NET_INC_STATS_BH(OutOfWindowIcmps);
787 goto out;
788 }
789
790 tcp_synq_drop(sk, req, prev);
791 goto out;
792
793 case TCP_SYN_SENT:
794 case TCP_SYN_RECV: /* Cannot happen.
795 It can, it SYNs are crossed. --ANK */
796 if (sk->lock.users == 0) {
797 TCP_INC_STATS_BH(TcpAttemptFails);
798 sk->err = err;
799 sk->error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
800
801 tcp_done(sk);
802 } else {
803 sk->err_soft = err;
804 }
805 goto out;
806 }
807
808 if (sk->lock.users == 0 && np->recverr) {
809 sk->err = err;
810 sk->error_report(sk);
811 } else {
812 sk->err_soft = err;
813 }
814
815 out:
816 bh_unlock_sock(sk);
817 sock_put(sk);
818 }
819
820
821 static int tcp_v6_send_synack(struct sock *sk, struct open_request *req,
822 struct dst_entry *dst)
823 {
824 struct sk_buff * skb;
825 struct ipv6_txoptions *opt = NULL;
826 struct flowi fl;
827 int err = -1;
828
829 fl.proto = IPPROTO_TCP;
830 fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
831 fl.nl_u.ip6_u.saddr = &req->af.v6_req.loc_addr;
832 fl.fl6_flowlabel = 0;
833 fl.oif = req->af.v6_req.iif;
834 fl.uli_u.ports.dport = req->rmt_port;
835 fl.uli_u.ports.sport = sk->sport;
836
837 if (dst == NULL) {
838 opt = sk->net_pinfo.af_inet6.opt;
839 if (opt == NULL &&
840 sk->net_pinfo.af_inet6.rxopt.bits.srcrt == 2 &&
841 req->af.v6_req.pktopts) {
842 struct sk_buff *pktopts = req->af.v6_req.pktopts;
843 struct inet6_skb_parm *rxopt = (struct inet6_skb_parm *)pktopts->cb;
844 if (rxopt->srcrt)
845 opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt));
846 }
847
848 if (opt && opt->srcrt) {
849 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
850 fl.nl_u.ip6_u.daddr = rt0->addr;
851 }
852
853 dst = ip6_route_output(sk, &fl);
854 if (dst->error)
855 goto done;
856 }
857
858 skb = tcp_make_synack(sk, dst, req);
859 if (skb) {
860 struct tcphdr *th = skb->h.th;
861
862 th->check = tcp_v6_check(th, skb->len,
863 &req->af.v6_req.loc_addr, &req->af.v6_req.rmt_addr,
864 csum_partial((char *)th, skb->len, skb->csum));
865
866 fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
867 err = ip6_xmit(sk, skb, &fl, opt);
868 if (err == NET_XMIT_CN)
869 err = 0;
870 }
871
872 done:
873 dst_release(dst);
874 if (opt && opt != sk->net_pinfo.af_inet6.opt)
875 sock_kfree_s(sk, opt, opt->tot_len);
876 return err;
877 }
878
879 static void tcp_v6_or_free(struct open_request *req)
880 {
881 if (req->af.v6_req.pktopts)
882 kfree_skb(req->af.v6_req.pktopts);
883 }
884
885 static struct or_calltable or_ipv6 = {
886 AF_INET6,
887 tcp_v6_send_synack,
888 tcp_v6_or_send_ack,
889 tcp_v6_or_free,
890 tcp_v6_send_reset
891 };
892
893 static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
894 {
895 struct inet6_skb_parm *opt = (struct inet6_skb_parm *)skb->cb;
896
897 if (sk->net_pinfo.af_inet6.rxopt.all) {
898 if ((opt->hop && sk->net_pinfo.af_inet6.rxopt.bits.hopopts) ||
899 ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) &&
900 sk->net_pinfo.af_inet6.rxopt.bits.rxflow) ||
901 (opt->srcrt && sk->net_pinfo.af_inet6.rxopt.bits.srcrt) ||
902 ((opt->dst1 || opt->dst0) && sk->net_pinfo.af_inet6.rxopt.bits.dstopts))
903 return 1;
904 }
905 return 0;
906 }
907
908
909 static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
910 struct sk_buff *skb)
911 {
912 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
913
914 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
915 csum_partial((char *)th, th->doff<<2,
916 skb->csum));
917 }
918
919
920 static void tcp_v6_send_reset(struct sk_buff *skb)
921 {
922 struct tcphdr *th = skb->h.th, *t1;
923 struct sk_buff *buff;
924 struct flowi fl;
925
926 if (th->rst)
927 return;
928
929 if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr))
930 return;
931
932 /*
933 * We need to grab some memory, and put together an RST,
934 * and then put it into the queue to be sent.
935 */
936
937 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
938 if (buff == NULL)
939 return;
940
941 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
942
943 t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr));
944
945 /* Swap the send and the receive. */
946 memset(t1, 0, sizeof(*t1));
947 t1->dest = th->source;
948 t1->source = th->dest;
949 t1->doff = sizeof(*t1)/4;
950 t1->rst = 1;
951
952 if(th->ack) {
953 t1->seq = th->ack_seq;
954 } else {
955 t1->ack = 1;
956 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
957 + skb->len - (th->doff<<2));
958 }
959
960 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
961
962 fl.nl_u.ip6_u.daddr = &skb->nh.ipv6h->saddr;
963 fl.nl_u.ip6_u.saddr = &skb->nh.ipv6h->daddr;
964 fl.fl6_flowlabel = 0;
965
966 t1->check = csum_ipv6_magic(fl.nl_u.ip6_u.saddr,
967 fl.nl_u.ip6_u.daddr,
968 sizeof(*t1), IPPROTO_TCP,
969 buff->csum);
970
971 fl.proto = IPPROTO_TCP;
972 fl.oif = tcp_v6_iif(skb);
973 fl.uli_u.ports.dport = t1->dest;
974 fl.uli_u.ports.sport = t1->source;
975
976 /* sk = NULL, but it is safe for now. RST socket required. */
977 buff->dst = ip6_route_output(NULL, &fl);
978
979 if (buff->dst->error == 0) {
980 ip6_xmit(NULL, buff, &fl, NULL);
981 TCP_INC_STATS_BH(TcpOutSegs);
982 TCP_INC_STATS_BH(TcpOutRsts);
983 return;
984 }
985
986 kfree_skb(buff);
987 }
988
989 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
990 {
991 struct tcphdr *th = skb->h.th, *t1;
992 struct sk_buff *buff;
993 struct flowi fl;
994 int tot_len = sizeof(struct tcphdr);
995
996 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr), GFP_ATOMIC);
997 if (buff == NULL)
998 return;
999
1000 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr));
1001
1002 if (ts)
1003 tot_len += 3*4;
1004
1005 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1006
1007 /* Swap the send and the receive. */
1008 memset(t1, 0, sizeof(*t1));
1009 t1->dest = th->source;
1010 t1->source = th->dest;
1011 t1->doff = tot_len/4;
1012 t1->seq = htonl(seq);
1013 t1->ack_seq = htonl(ack);
1014 t1->ack = 1;
1015 t1->window = htons(win);
1016
1017 if (ts) {
1018 u32 *ptr = (u32*)(t1 + 1);
1019 *ptr++ = __constant_htonl((TCPOPT_NOP << 24) |
1020 (TCPOPT_NOP << 16) |
1021 (TCPOPT_TIMESTAMP << 8) |
1022 TCPOLEN_TIMESTAMP);
1023 *ptr++ = htonl(tcp_time_stamp);
1024 *ptr = htonl(ts);
1025 }
1026
1027 buff->csum = csum_partial((char *)t1, tot_len, 0);
1028
1029 fl.nl_u.ip6_u.daddr = &skb->nh.ipv6h->saddr;
1030 fl.nl_u.ip6_u.saddr = &skb->nh.ipv6h->daddr;
1031 fl.fl6_flowlabel = 0;
1032
1033 t1->check = csum_ipv6_magic(fl.nl_u.ip6_u.saddr,
1034 fl.nl_u.ip6_u.daddr,
1035 tot_len, IPPROTO_TCP,
1036 buff->csum);
1037
1038 fl.proto = IPPROTO_TCP;
1039 fl.oif = tcp_v6_iif(skb);
1040 fl.uli_u.ports.dport = t1->dest;
1041 fl.uli_u.ports.sport = t1->source;
1042
1043 buff->dst = ip6_route_output(NULL, &fl);
1044
1045 if (buff->dst->error == 0) {
1046 ip6_xmit(NULL, buff, &fl, NULL);
1047 TCP_INC_STATS_BH(TcpOutSegs);
1048 return;
1049 }
1050
1051 kfree_skb(buff);
1052 }
1053
1054 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1055 {
1056 struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
1057
1058 tcp_v6_send_ack(skb, tw->snd_nxt, tw->rcv_nxt,
1059 tw->rcv_wnd>>tw->rcv_wscale, tw->ts_recent);
1060
1061 tcp_tw_put(tw);
1062 }
1063
1064 static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req)
1065 {
1066 tcp_v6_send_ack(skb, req->snt_isn+1, req->rcv_isn+1, req->rcv_wnd, req->ts_recent);
1067 }
1068
1069
1070 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1071 {
1072 struct open_request *req, **prev;
1073 struct tcphdr *th = skb->h.th;
1074 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
1075
1076 /* Find possible connection requests. */
1077 req = tcp_v6_search_req(tp, skb->nh.ipv6h, th, tcp_v6_iif(skb), &prev);
1078 if (req)
1079 return tcp_check_req(sk, skb, req, prev);
1080
1081 if (tp->accept_queue) {
1082 struct sock *nsk;
1083
1084 nsk = __tcp_v6_lookup_established(&skb->nh.ipv6h->saddr,
1085 th->source,
1086 &skb->nh.ipv6h->daddr,
1087 ntohs(th->dest),
1088 tcp_v6_iif(skb));
1089
1090 if (nsk) {
1091 if (nsk->state != TCP_TIME_WAIT) {
1092 bh_lock_sock(nsk);
1093 return nsk;
1094 }
1095 tcp_tw_put((struct tcp_tw_bucket*)sk);
1096 return NULL;
1097 }
1098 }
1099
1100 #if 0 /*def CONFIG_SYN_COOKIES*/
1101 if (!th->rst && (th->syn || th->ack))
1102 sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
1103 #endif
1104 return sk;
1105 }
1106
1107 static void tcp_v6_synq_add(struct sock *sk, struct open_request *req)
1108 {
1109 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
1110 struct tcp_listen_opt *lopt = tp->listen_opt;
1111 unsigned h = tcp_v6_synq_hash(&req->af.v6_req.rmt_addr, req->rmt_port);
1112
1113 req->sk = NULL;
1114 req->expires = jiffies + TCP_TIMEOUT_INIT;
1115 req->retrans = 0;
1116 req->index = h;
1117 req->dl_next = lopt->syn_table[h];
1118
1119 write_lock(&tp->syn_wait_lock);
1120 lopt->syn_table[h] = req;
1121 write_unlock(&tp->syn_wait_lock);
1122
1123 tcp_synq_added(sk);
1124 }
1125
1126
1127 /* FIXME: this is substantially similar to the ipv4 code.
1128 * Can some kind of merge be done? -- erics
1129 */
1130 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1131 {
1132 struct tcp_opt tp;
1133 struct open_request *req = NULL;
1134 __u32 isn = TCP_SKB_CB(skb)->when;
1135
1136 if (skb->protocol == __constant_htons(ETH_P_IP))
1137 return tcp_v4_conn_request(sk, skb);
1138
1139 /* FIXME: do the same check for anycast */
1140 if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr))
1141 goto drop;
1142
1143 /*
1144 * There are no SYN attacks on IPv6, yet...
1145 */
1146 if (tcp_synq_is_full(sk) && !isn) {
1147 if (net_ratelimit())
1148 printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
1149 goto drop;
1150 }
1151
1152 if (tcp_acceptq_is_full(sk) && tcp_synq_young(sk) > 1)
1153 goto drop;
1154
1155 req = tcp_openreq_alloc();
1156 if (req == NULL)
1157 goto drop;
1158
1159 tp.tstamp_ok = tp.sack_ok = tp.wscale_ok = tp.snd_wscale = 0;
1160 tp.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1161 tp.user_mss = sk->tp_pinfo.af_tcp.user_mss;
1162
1163 tcp_parse_options(NULL, skb->h.th, &tp, 0);
1164
1165 tcp_openreq_init(req, &tp, skb);
1166
1167 req->class = &or_ipv6;
1168 ipv6_addr_copy(&req->af.v6_req.rmt_addr, &skb->nh.ipv6h->saddr);
1169 ipv6_addr_copy(&req->af.v6_req.loc_addr, &skb->nh.ipv6h->daddr);
1170 req->af.v6_req.pktopts = NULL;
1171 if (ipv6_opt_accepted(sk, skb) ||
1172 sk->net_pinfo.af_inet6.rxopt.bits.rxinfo ||
1173 sk->net_pinfo.af_inet6.rxopt.bits.rxhlim) {
1174 atomic_inc(&skb->users);
1175 req->af.v6_req.pktopts = skb;
1176 }
1177 req->af.v6_req.iif = sk->bound_dev_if;
1178
1179 /* So that link locals have meaning */
1180 if (!sk->bound_dev_if && ipv6_addr_type(&req->af.v6_req.rmt_addr)&IPV6_ADDR_LINKLOCAL)
1181 req->af.v6_req.iif = tcp_v6_iif(skb);
1182
1183 if (isn == 0)
1184 isn = tcp_v6_init_sequence(sk,skb);
1185
1186 req->snt_isn = isn;
1187
1188 if (tcp_v6_send_synack(sk, req, NULL))
1189 goto drop;
1190
1191 tcp_v6_synq_add(sk, req);
1192
1193 return 0;
1194
1195 drop:
1196 if (req)
1197 tcp_openreq_free(req);
1198
1199 TCP_INC_STATS_BH(TcpAttemptFails);
1200 return 0; /* don't send reset */
1201 }
1202
1203 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1204 struct open_request *req,
1205 struct dst_entry *dst)
1206 {
1207 struct ipv6_pinfo *np;
1208 struct flowi fl;
1209 struct tcp_opt *newtp;
1210 struct sock *newsk;
1211 struct ipv6_txoptions *opt;
1212
1213 if (skb->protocol == __constant_htons(ETH_P_IP)) {
1214 /*
1215 * v6 mapped
1216 */
1217
1218 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1219
1220 if (newsk == NULL)
1221 return NULL;
1222
1223 np = &newsk->net_pinfo.af_inet6;
1224
1225 ipv6_addr_set(&np->daddr, 0, 0, __constant_htonl(0x0000FFFF),
1226 newsk->daddr);
1227
1228 ipv6_addr_set(&np->saddr, 0, 0, __constant_htonl(0x0000FFFF),
1229 newsk->saddr);
1230
1231 ipv6_addr_copy(&np->rcv_saddr, &np->saddr);
1232
1233 newsk->tp_pinfo.af_tcp.af_specific = &ipv6_mapped;
1234 newsk->backlog_rcv = tcp_v4_do_rcv;
1235 newsk->net_pinfo.af_inet6.pktoptions = NULL;
1236 newsk->net_pinfo.af_inet6.opt = NULL;
1237 newsk->net_pinfo.af_inet6.mcast_oif = tcp_v6_iif(skb);
1238 newsk->net_pinfo.af_inet6.mcast_hops = skb->nh.ipv6h->hop_limit;
1239
1240 /* Charge newly allocated IPv6 socket. Though it is mapped,
1241 * it is IPv6 yet.
1242 */
1243 #ifdef INET_REFCNT_DEBUG
1244 atomic_inc(&inet6_sock_nr);
1245 #endif
1246 MOD_INC_USE_COUNT;
1247
1248 /* It is tricky place. Until this moment IPv4 tcp
1249 worked with IPv6 af_tcp.af_specific.
1250 Sync it now.
1251 */
1252 tcp_sync_mss(newsk, newsk->tp_pinfo.af_tcp.pmtu_cookie);
1253
1254 return newsk;
1255 }
1256
1257 opt = sk->net_pinfo.af_inet6.opt;
1258
1259 if (tcp_acceptq_is_full(sk))
1260 goto out_overflow;
1261
1262 if (sk->net_pinfo.af_inet6.rxopt.bits.srcrt == 2 &&
1263 opt == NULL && req->af.v6_req.pktopts) {
1264 struct inet6_skb_parm *rxopt = (struct inet6_skb_parm *)req->af.v6_req.pktopts->cb;
1265 if (rxopt->srcrt)
1266 opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(req->af.v6_req.pktopts->nh.raw+rxopt->srcrt));
1267 }
1268
1269 if (dst == NULL) {
1270 fl.proto = IPPROTO_TCP;
1271 fl.nl_u.ip6_u.daddr = &req->af.v6_req.rmt_addr;
1272 if (opt && opt->srcrt) {
1273 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1274 fl.nl_u.ip6_u.daddr = rt0->addr;
1275 }
1276 fl.nl_u.ip6_u.saddr = &req->af.v6_req.loc_addr;
1277 fl.fl6_flowlabel = 0;
1278 fl.oif = sk->bound_dev_if;
1279 fl.uli_u.ports.dport = req->rmt_port;
1280 fl.uli_u.ports.sport = sk->sport;
1281
1282 dst = ip6_route_output(sk, &fl);
1283 }
1284
1285 if (dst->error)
1286 goto out;
1287
1288 newsk = tcp_create_openreq_child(sk, req, skb);
1289 if (newsk == NULL)
1290 goto out;
1291
1292 /* Charge newly allocated IPv6 socket */
1293 #ifdef INET_REFCNT_DEBUG
1294 atomic_inc(&inet6_sock_nr);
1295 #endif
1296 MOD_INC_USE_COUNT;
1297
1298 ip6_dst_store(newsk, dst, NULL);
1299
1300 newtp = &(newsk->tp_pinfo.af_tcp);
1301
1302 np = &newsk->net_pinfo.af_inet6;
1303 ipv6_addr_copy(&np->daddr, &req->af.v6_req.rmt_addr);
1304 ipv6_addr_copy(&np->saddr, &req->af.v6_req.loc_addr);
1305 ipv6_addr_copy(&np->rcv_saddr, &req->af.v6_req.loc_addr);
1306 newsk->bound_dev_if = req->af.v6_req.iif;
1307
1308 /* Now IPv6 options...
1309
1310 First: no IPv4 options.
1311 */
1312 newsk->protinfo.af_inet.opt = NULL;
1313
1314 /* Clone RX bits */
1315 np->rxopt.all = sk->net_pinfo.af_inet6.rxopt.all;
1316
1317 /* Clone pktoptions received with SYN */
1318 np->pktoptions = NULL;
1319 if (req->af.v6_req.pktopts) {
1320 np->pktoptions = skb_clone(req->af.v6_req.pktopts, GFP_ATOMIC);
1321 kfree_skb(req->af.v6_req.pktopts);
1322 req->af.v6_req.pktopts = NULL;
1323 if (np->pktoptions)
1324 skb_set_owner_r(np->pktoptions, newsk);
1325 }
1326 np->opt = NULL;
1327 np->mcast_oif = tcp_v6_iif(skb);
1328 np->mcast_hops = skb->nh.ipv6h->hop_limit;
1329
1330 /* Clone native IPv6 options from listening socket (if any)
1331
1332 Yes, keeping reference count would be much more clever,
1333 but we make one more one thing there: reattach optmem
1334 to newsk.
1335 */
1336 if (opt) {
1337 np->opt = ipv6_dup_options(newsk, opt);
1338 if (opt != sk->net_pinfo.af_inet6.opt)
1339 sock_kfree_s(sk, opt, opt->tot_len);
1340 }
1341
1342 newtp->ext_header_len = 0;
1343 if (np->opt)
1344 newtp->ext_header_len = np->opt->opt_nflen + np->opt->opt_flen;
1345
1346 tcp_sync_mss(newsk, dst->pmtu);
1347 tcp_initialize_rcv_mss(newsk);
1348 newtp->advmss = dst->advmss;
1349
1350 tcp_init_buffer_space(newsk);
1351
1352 newsk->daddr = LOOPBACK4_IPV6;
1353 newsk->saddr = LOOPBACK4_IPV6;
1354 newsk->rcv_saddr= LOOPBACK4_IPV6;
1355
1356 __tcp_v6_hash(newsk);
1357 tcp_inherit_port(sk, newsk);
1358
1359 return newsk;
1360
1361 out_overflow:
1362 NET_INC_STATS_BH(ListenOverflows);
1363 out:
1364 NET_INC_STATS_BH(ListenDrops);
1365 if (opt && opt != sk->net_pinfo.af_inet6.opt)
1366 sock_kfree_s(sk, opt, opt->tot_len);
1367 dst_release(dst);
1368 return NULL;
1369 }
1370
1371 static int tcp_v6_checksum_init(struct sk_buff *skb)
1372 {
1373 if (skb->ip_summed == CHECKSUM_HW) {
1374 if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
1375 &skb->nh.ipv6h->daddr,skb->csum)) {
1376 NETDEBUG(printk(KERN_DEBUG "hw tcp v6 csum failed\n"));
1377 return -1;
1378 }
1379 skb->ip_summed = CHECKSUM_UNNECESSARY;
1380 } else if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
1381 if (skb->len <= 68) {
1382 if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
1383 &skb->nh.ipv6h->daddr,csum_partial((char *)skb->h.th, skb->len, 0)))
1384 return -1;
1385 skb->ip_summed = CHECKSUM_UNNECESSARY;
1386 } else {
1387 skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
1388 &skb->nh.ipv6h->daddr,0);
1389 }
1390 }
1391 return 0;
1392 }
1393
1394 /* The socket must have it's spinlock held when we get
1395 * here.
1396 *
1397 * We have a potential double-lock case here, so even when
1398 * doing backlog processing we use the BH locking scheme.
1399 * This is because we cannot sleep with the original spinlock
1400 * held.
1401 */
1402 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1403 {
1404 #ifdef CONFIG_FILTER
1405 struct sk_filter *filter;
1406 #endif
1407 int users = 0;
1408
1409 /* Imagine: socket is IPv6. IPv4 packet arrives,
1410 goes to IPv4 receive handler and backlogged.
1411 From backlog it always goes here. Kerboom...
1412 Fortunately, tcp_rcv_established and rcv_established
1413 handle them correctly, but it is not case with
1414 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1415 */
1416
1417 if (skb->protocol == __constant_htons(ETH_P_IP))
1418 return tcp_v4_do_rcv(sk, skb);
1419
1420 #ifdef CONFIG_FILTER
1421 filter = sk->filter;
1422 if (filter && sk_filter(skb, filter))
1423 goto discard;
1424 #endif /* CONFIG_FILTER */
1425
1426 /*
1427 * socket locking is here for SMP purposes as backlog rcv
1428 * is currently called with bh processing disabled.
1429 */
1430
1431 IP6_INC_STATS_BH(Ip6InDelivers);
1432
1433 /* Do Stevens' IPV6_PKTOPTIONS.
1434
1435 Yes, guys, it is the only place in our code, where we
1436 may make it not affecting IPv4.
1437 The rest of code is protocol independent,
1438 and I do not like idea to uglify IPv4.
1439
1440 Actually, all the idea behind IPV6_PKTOPTIONS
1441 looks not very well thought. For now we latch
1442 options, received in the last packet, enqueued
1443 by tcp. Feel free to propose better solution.
1444 --ANK (980728)
1445 */
1446 if (sk->net_pinfo.af_inet6.rxopt.all) {
1447 users = atomic_read(&skb->users);
1448 atomic_inc(&skb->users);
1449 }
1450
1451 if (sk->state == TCP_ESTABLISHED) { /* Fast path */
1452 TCP_CHECK_TIMER(sk);
1453 if (tcp_rcv_established(sk, skb, skb->h.th, skb->len))
1454 goto reset;
1455 TCP_CHECK_TIMER(sk);
1456 if (users)
1457 goto ipv6_pktoptions;
1458 return 0;
1459 }
1460
1461 if (tcp_checksum_complete(skb))
1462 goto csum_err;
1463
1464 if (sk->state == TCP_LISTEN) {
1465 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1466 if (!nsk)
1467 goto discard;
1468
1469 /*
1470 * Queue it on the new socket if the new socket is active,
1471 * otherwise we just shortcircuit this and continue with
1472 * the new socket..
1473 */
1474 if(nsk != sk) {
1475 if (tcp_child_process(sk, nsk, skb))
1476 goto reset;
1477 if (users)
1478 kfree_skb(skb);
1479 return 0;
1480 }
1481 }
1482
1483 TCP_CHECK_TIMER(sk);
1484 if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len))
1485 goto reset;
1486 TCP_CHECK_TIMER(sk);
1487 if (users)
1488 goto ipv6_pktoptions;
1489 return 0;
1490
1491 reset:
1492 tcp_v6_send_reset(skb);
1493 discard:
1494 if (users)
1495 kfree_skb(skb);
1496 kfree_skb(skb);
1497 return 0;
1498 csum_err:
1499 TCP_INC_STATS_BH(TcpInErrs);
1500 goto discard;
1501
1502
1503 ipv6_pktoptions:
1504 /* Do you ask, what is it?
1505
1506 1. skb was enqueued by tcp.
1507 2. skb is added to tail of read queue, rather than out of order.
1508 3. socket is not in passive state.
1509 4. Finally, it really contains options, which user wants to receive.
1510 */
1511 if (atomic_read(&skb->users) > users &&
1512 TCP_SKB_CB(skb)->end_seq == sk->tp_pinfo.af_tcp.rcv_nxt &&
1513 !((1<<sk->state)&(TCPF_CLOSE|TCPF_LISTEN))) {
1514 if (sk->net_pinfo.af_inet6.rxopt.bits.rxinfo)
1515 sk->net_pinfo.af_inet6.mcast_oif = tcp_v6_iif(skb);
1516 if (sk->net_pinfo.af_inet6.rxopt.bits.rxhlim)
1517 sk->net_pinfo.af_inet6.mcast_hops = skb->nh.ipv6h->hop_limit;
1518 if (ipv6_opt_accepted(sk, skb)) {
1519 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
1520 kfree_skb(skb);
1521 skb = NULL;
1522 if (skb2) {
1523 skb_set_owner_r(skb2, sk);
1524 skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, skb2);
1525 }
1526 } else {
1527 kfree_skb(skb);
1528 skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, NULL);
1529 }
1530 }
1531
1532 if (skb)
1533 kfree_skb(skb);
1534 return 0;
1535 }
1536
1537 int tcp_v6_rcv(struct sk_buff *skb, unsigned long len)
1538 {
1539 struct tcphdr *th;
1540 struct sock *sk;
1541 struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
1542 struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
1543 int ret;
1544
1545 th = skb->h.th;
1546
1547 if (skb->pkt_type != PACKET_HOST)
1548 goto discard_it;
1549
1550 /*
1551 * Pull up the IP header.
1552 */
1553
1554 __skb_pull(skb, skb->h.raw - skb->data);
1555
1556 /*
1557 * Count it even if it's bad.
1558 */
1559
1560 TCP_INC_STATS_BH(TcpInSegs);
1561
1562 if (len < sizeof(struct tcphdr))
1563 goto bad_packet;
1564
1565 if (tcp_v6_checksum_init(skb) < 0)
1566 goto bad_packet;
1567
1568 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1569 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1570 len - th->doff*4);
1571 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1572 TCP_SKB_CB(skb)->when = 0;
1573 skb->used = 0;
1574
1575 sk = __tcp_v6_lookup(saddr, th->source, daddr, ntohs(th->dest), tcp_v6_iif(skb));
1576
1577 if (!sk)
1578 goto no_tcp_socket;
1579
1580 process:
1581 if(!ipsec_sk_policy(sk,skb))
1582 goto discard_and_relse;
1583 if(sk->state == TCP_TIME_WAIT)
1584 goto do_time_wait;
1585
1586 bh_lock_sock(sk);
1587 ret = 0;
1588 if (!sk->lock.users) {
1589 if (!tcp_prequeue(sk, skb))
1590 ret = tcp_v6_do_rcv(sk, skb);
1591 } else
1592 sk_add_backlog(sk, skb);
1593 bh_unlock_sock(sk);
1594
1595 sock_put(sk);
1596 return ret;
1597
1598 no_tcp_socket:
1599 if (tcp_checksum_complete(skb)) {
1600 bad_packet:
1601 TCP_INC_STATS_BH(TcpInErrs);
1602 } else {
1603 tcp_v6_send_reset(skb);
1604 }
1605
1606 discard_it:
1607
1608 /*
1609 * Discard frame
1610 */
1611
1612 kfree_skb(skb);
1613 return 0;
1614
1615 discard_and_relse:
1616 sock_put(sk);
1617 goto discard_it;
1618
1619 do_time_wait:
1620 if (tcp_checksum_complete(skb)) {
1621 TCP_INC_STATS_BH(TcpInErrs);
1622 sock_put(sk);
1623 goto discard_it;
1624 }
1625
1626 switch(tcp_timewait_state_process((struct tcp_tw_bucket *)sk,
1627 skb, th, skb->len)) {
1628 case TCP_TW_SYN:
1629 {
1630 struct sock *sk2;
1631
1632 sk2 = tcp_v6_lookup_listener(&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb));
1633 if (sk2 != NULL) {
1634 tcp_tw_deschedule((struct tcp_tw_bucket *)sk);
1635 tcp_timewait_kill((struct tcp_tw_bucket *)sk);
1636 tcp_tw_put((struct tcp_tw_bucket *)sk);
1637 sk = sk2;
1638 goto process;
1639 }
1640 /* Fall through to ACK */
1641 }
1642 case TCP_TW_ACK:
1643 tcp_v6_timewait_ack(sk, skb);
1644 break;
1645 case TCP_TW_RST:
1646 goto no_tcp_socket;
1647 case TCP_TW_SUCCESS:
1648 }
1649 goto discard_it;
1650 }
1651
1652 static int tcp_v6_rebuild_header(struct sock *sk)
1653 {
1654 int err;
1655 struct dst_entry *dst;
1656 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
1657
1658 dst = __sk_dst_check(sk, np->dst_cookie);
1659
1660 if (dst == NULL) {
1661 struct flowi fl;
1662
1663 fl.proto = IPPROTO_TCP;
1664 fl.nl_u.ip6_u.daddr = &np->daddr;
1665 fl.nl_u.ip6_u.saddr = &np->saddr;
1666 fl.fl6_flowlabel = np->flow_label;
1667 fl.oif = sk->bound_dev_if;
1668 fl.uli_u.ports.dport = sk->dport;
1669 fl.uli_u.ports.sport = sk->sport;
1670
1671 if (np->opt && np->opt->srcrt) {
1672 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
1673 fl.nl_u.ip6_u.daddr = rt0->addr;
1674 }
1675
1676 dst = ip6_route_output(sk, &fl);
1677
1678 if (dst->error) {
1679 err = dst->error;
1680 dst_release(dst);
1681 return err;
1682 }
1683
1684 ip6_dst_store(sk, dst, NULL);
1685 }
1686
1687 return 0;
1688 }
1689
1690 static int tcp_v6_xmit(struct sk_buff *skb)
1691 {
1692 struct sock *sk = skb->sk;
1693 struct ipv6_pinfo * np = &sk->net_pinfo.af_inet6;
1694 struct flowi fl;
1695 struct dst_entry *dst;
1696
1697 fl.proto = IPPROTO_TCP;
1698 fl.fl6_dst = &np->daddr;
1699 fl.fl6_src = &np->saddr;
1700 fl.fl6_flowlabel = np->flow_label;
1701 fl.oif = sk->bound_dev_if;
1702 fl.uli_u.ports.sport = sk->sport;
1703 fl.uli_u.ports.dport = sk->dport;
1704
1705 if (np->opt && np->opt->srcrt) {
1706 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
1707 fl.nl_u.ip6_u.daddr = rt0->addr;
1708 }
1709
1710 dst = __sk_dst_check(sk, np->dst_cookie);
1711
1712 if (dst == NULL) {
1713 dst = ip6_route_output(sk, &fl);
1714
1715 if (dst->error) {
1716 sk->err_soft = -dst->error;
1717 dst_release(dst);
1718 return -sk->err_soft;
1719 }
1720
1721 ip6_dst_store(sk, dst, NULL);
1722 }
1723
1724 skb->dst = dst_clone(dst);
1725
1726 /* Restore final destination back after routing done */
1727 fl.nl_u.ip6_u.daddr = &np->daddr;
1728
1729 return ip6_xmit(sk, skb, &fl, np->opt);
1730 }
1731
1732 static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
1733 {
1734 struct ipv6_pinfo * np = &sk->net_pinfo.af_inet6;
1735 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
1736
1737 sin6->sin6_family = AF_INET6;
1738 memcpy(&sin6->sin6_addr, &np->daddr, sizeof(struct in6_addr));
1739 sin6->sin6_port = sk->dport;
1740 /* We do not store received flowlabel for TCP */
1741 sin6->sin6_flowinfo = 0;
1742 sin6->sin6_scope_id = 0;
1743 if (sk->bound_dev_if && ipv6_addr_type(&sin6->sin6_addr)&IPV6_ADDR_LINKLOCAL)
1744 sin6->sin6_scope_id = sk->bound_dev_if;
1745 }
1746
1747 static int tcp_v6_remember_stamp(struct sock *sk)
1748 {
1749 /* Alas, not yet... */
1750 return 0;
1751 }
1752
1753 static struct tcp_func ipv6_specific = {
1754 tcp_v6_xmit,
1755 tcp_v6_send_check,
1756 tcp_v6_rebuild_header,
1757 tcp_v6_conn_request,
1758 tcp_v6_syn_recv_sock,
1759 tcp_v6_hash_connecting,
1760 tcp_v6_remember_stamp,
1761 sizeof(struct ipv6hdr),
1762
1763 ipv6_setsockopt,
1764 ipv6_getsockopt,
1765 v6_addr2sockaddr,
1766 sizeof(struct sockaddr_in6)
1767 };
1768
1769 /*
1770 * TCP over IPv4 via INET6 API
1771 */
1772
1773 static struct tcp_func ipv6_mapped = {
1774 ip_queue_xmit,
1775 tcp_v4_send_check,
1776 tcp_v4_rebuild_header,
1777 tcp_v6_conn_request,
1778 tcp_v6_syn_recv_sock,
1779 tcp_v4_hash_connecting,
1780 tcp_v4_remember_stamp,
1781 sizeof(struct iphdr),
1782
1783 ipv6_setsockopt,
1784 ipv6_getsockopt,
1785 v6_addr2sockaddr,
1786 sizeof(struct sockaddr_in6)
1787 };
1788
1789
1790
1791 /* NOTE: A lot of things set to zero explicitly by call to
1792 * sk_alloc() so need not be done here.
1793 */
1794 static int tcp_v6_init_sock(struct sock *sk)
1795 {
1796 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
1797
1798 skb_queue_head_init(&tp->out_of_order_queue);
1799 tcp_init_xmit_timers(sk);
1800 tcp_prequeue_init(tp);
1801
1802 tp->rto = TCP_TIMEOUT_INIT;
1803 tp->mdev = TCP_TIMEOUT_INIT;
1804
1805 /* So many TCP implementations out there (incorrectly) count the
1806 * initial SYN frame in their delayed-ACK and congestion control
1807 * algorithms that we must have the following bandaid to talk
1808 * efficiently to them. -DaveM
1809 */
1810 tp->snd_cwnd = 2;
1811
1812 /* See draft-stevens-tcpca-spec-01 for discussion of the
1813 * initialization of these values.
1814 */
1815 tp->snd_ssthresh = 0x7fffffff;
1816 tp->snd_cwnd_clamp = ~0;
1817 tp->mss_cache = 536;
1818
1819 sk->state = TCP_CLOSE;
1820
1821 sk->tp_pinfo.af_tcp.af_specific = &ipv6_specific;
1822
1823 sk->write_space = tcp_write_space;
1824
1825 return 0;
1826 }
1827
1828 static int tcp_v6_destroy_sock(struct sock *sk)
1829 {
1830 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
1831
1832 tcp_clear_xmit_timers(sk);
1833
1834 /* Cleanup up the write buffer. */
1835 __skb_queue_purge(&sk->write_queue);
1836
1837 /* Cleans up our, hopefuly empty, out_of_order_queue. */
1838 __skb_queue_purge(&tp->out_of_order_queue);
1839
1840 /* Clean prequeue, it must be empty really */
1841 __skb_queue_purge(&tp->ucopy.prequeue);
1842
1843 /* Clean up a referenced TCP bind bucket. */
1844 if(sk->prev != NULL)
1845 tcp_put_port(sk);
1846
1847 return inet6_destroy_sock(sk);
1848 }
1849
1850 /* Proc filesystem TCPv6 sock list dumping. */
1851 static void get_openreq6(struct sock *sk, struct open_request *req, char *tmpbuf, int i)
1852 {
1853 struct in6_addr *dest, *src;
1854 int ttd = req->expires - jiffies;
1855
1856 if (ttd < 0)
1857 ttd = 0;
1858
1859 src = &req->af.v6_req.loc_addr;
1860 dest = &req->af.v6_req.rmt_addr;
1861 sprintf(tmpbuf,
1862 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1863 "%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
1864 i,
1865 src->s6_addr32[0], src->s6_addr32[1],
1866 src->s6_addr32[2], src->s6_addr32[3],
1867 ntohs(sk->sport),
1868 dest->s6_addr32[0], dest->s6_addr32[1],
1869 dest->s6_addr32[2], dest->s6_addr32[3],
1870 ntohs(req->rmt_port),
1871 TCP_SYN_RECV,
1872 0,0, /* could print option size, but that is af dependent. */
1873 1, /* timers active (only the expire timer) */
1874 ttd,
1875 req->retrans,
1876 sk->socket ? sk->socket->inode->i_uid : 0,
1877 0, /* non standard timer */
1878 0, /* open_requests have no inode */
1879 0, req);
1880 }
1881
1882 static void get_tcp6_sock(struct sock *sp, char *tmpbuf, int i)
1883 {
1884 struct in6_addr *dest, *src;
1885 __u16 destp, srcp;
1886 int timer_active;
1887 unsigned long timer_expires;
1888 struct tcp_opt *tp = &sp->tp_pinfo.af_tcp;
1889
1890 dest = &sp->net_pinfo.af_inet6.daddr;
1891 src = &sp->net_pinfo.af_inet6.rcv_saddr;
1892 destp = ntohs(sp->dport);
1893 srcp = ntohs(sp->sport);
1894 timer_active = 0;
1895 timer_expires = (unsigned) -1;
1896 if (tp->retransmit_timer.prev != NULL && tp->retransmit_timer.expires < timer_expires) {
1897 timer_active = 1;
1898 timer_expires = tp->retransmit_timer.expires;
1899 } else if (tp->probe_timer.prev != NULL && tp->probe_timer.expires < timer_expires) {
1900 timer_active = 4;
1901 timer_expires = tp->probe_timer.expires;
1902 }
1903 if (sp->timer.prev != NULL && sp->timer.expires < timer_expires) {
1904 timer_active = 2;
1905 timer_expires = sp->timer.expires;
1906 }
1907 if(timer_active == 0)
1908 timer_expires = jiffies;
1909
1910 sprintf(tmpbuf,
1911 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1912 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %ld %d %p %u %u %u %u",
1913 i,
1914 src->s6_addr32[0], src->s6_addr32[1],
1915 src->s6_addr32[2], src->s6_addr32[3], srcp,
1916 dest->s6_addr32[0], dest->s6_addr32[1],
1917 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1918 sp->state,
1919 tp->write_seq-tp->snd_una, tp->rcv_nxt-tp->copied_seq,
1920 timer_active, timer_expires-jiffies,
1921 tp->retransmits,
1922 sp->socket ? sp->socket->inode->i_uid : 0,
1923 tp->probes_out,
1924 sp->socket ? sp->socket->inode->i_ino : 0,
1925 atomic_read(&sp->refcnt), sp,
1926 tp->rto, tp->ack.ato, tp->ack.quick, tp->ack.pingpong
1927 );
1928 }
1929
1930 static void get_timewait6_sock(struct tcp_tw_bucket *tw, char *tmpbuf, int i)
1931 {
1932 struct in6_addr *dest, *src;
1933 __u16 destp, srcp;
1934 int ttd = tw->ttd - jiffies;
1935
1936 if (ttd < 0)
1937 ttd = 0;
1938
1939 dest = &tw->v6_daddr;
1940 src = &tw->v6_rcv_saddr;
1941 destp = ntohs(tw->dport);
1942 srcp = ntohs(tw->sport);
1943
1944 sprintf(tmpbuf,
1945 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1946 "%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
1947 i,
1948 src->s6_addr32[0], src->s6_addr32[1],
1949 src->s6_addr32[2], src->s6_addr32[3], srcp,
1950 dest->s6_addr32[0], dest->s6_addr32[1],
1951 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1952 tw->substate, 0, 0,
1953 3, ttd, 0, 0, 0, 0,
1954 atomic_read(&tw->refcnt), tw);
1955 }
1956
1957 #define LINE_LEN 190
1958 #define LINE_FMT "%-190s\n"
1959
1960 int tcp6_get_info(char *buffer, char **start, off_t offset, int length)
1961 {
1962 int len = 0, num = 0, i;
1963 off_t begin, pos = 0;
1964 char tmpbuf[LINE_LEN+2];
1965
1966 if(offset < LINE_LEN+1)
1967 len += sprintf(buffer, LINE_FMT,
1968 " sl " /* 6 */
1969 "local_address " /* 38 */
1970 "remote_address " /* 38 */
1971 "st tx_queue rx_queue tr tm->when retrnsmt" /* 41 */
1972 " uid timeout inode"); /* 21 */
1973 /*----*/
1974 /*144 */
1975
1976 pos = LINE_LEN+1;
1977
1978 /* First, walk listening socket table. */
1979 tcp_listen_lock();
1980 for(i = 0; i < TCP_LHTABLE_SIZE; i++) {
1981 struct sock *sk = tcp_listening_hash[i];
1982 struct tcp_listen_opt *lopt;
1983 int k;
1984
1985 for (sk = tcp_listening_hash[i]; sk; sk = sk->next, num++) {
1986 struct open_request *req;
1987 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
1988
1989 if (sk->family != PF_INET6)
1990 continue;
1991 pos += LINE_LEN+1;
1992 if (pos >= offset) {
1993 get_tcp6_sock(sk, tmpbuf, num);
1994 len += sprintf(buffer+len, LINE_FMT, tmpbuf);
1995 if (len >= length) {
1996 tcp_listen_unlock();
1997 goto out_no_bh;
1998 }
1999 }
2000
2001 read_lock_bh(&tp->syn_wait_lock);
2002 lopt = tp->listen_opt;
2003 if (lopt && lopt->qlen != 0) {
2004 for (k=0; k<TCP_SYNQ_HSIZE; k++) {
2005 for (req = lopt->syn_table[k]; req; req = req->dl_next, num++) {
2006 if (req->class->family != PF_INET6)
2007 continue;
2008 pos += LINE_LEN+1;
2009 if (pos < offset)
2010 continue;
2011 get_openreq6(sk, req, tmpbuf, num);
2012 len += sprintf(buffer+len, LINE_FMT, tmpbuf);
2013 if(len >= length) {
2014 read_unlock_bh(&tp->syn_wait_lock);
2015 tcp_listen_unlock();
2016 goto out_no_bh;
2017 }
2018 }
2019 }
2020 }
2021 read_unlock_bh(&tp->syn_wait_lock);
2022
2023 /* Completed requests are in normal socket hash table */
2024 }
2025 }
2026 tcp_listen_unlock();
2027
2028 local_bh_disable();
2029
2030 /* Next, walk established hash chain. */
2031 for (i = 0; i < tcp_ehash_size; i++) {
2032 struct tcp_ehash_bucket *head = &tcp_ehash[i];
2033 struct sock *sk;
2034 struct tcp_tw_bucket *tw;
2035
2036 read_lock(&head->lock);
2037 for(sk = head->chain; sk; sk = sk->next, num++) {
2038 if (sk->family != PF_INET6)
2039 continue;
2040 pos += LINE_LEN+1;
2041 if (pos < offset)
2042 continue;
2043 get_tcp6_sock(sk, tmpbuf, num);
2044 len += sprintf(buffer+len, LINE_FMT, tmpbuf);
2045 if(len >= length) {
2046 read_unlock(&head->lock);
2047 goto out;
2048 }
2049 }
2050 for (tw = (struct tcp_tw_bucket *)tcp_ehash[i+tcp_ehash_size].chain;
2051 tw != NULL;
2052 tw = (struct tcp_tw_bucket *)tw->next, num++) {
2053 if (tw->family != PF_INET6)
2054 continue;
2055 pos += LINE_LEN+1;
2056 if (pos < offset)
2057 continue;
2058 get_timewait6_sock(tw, tmpbuf, num);
2059 len += sprintf(buffer+len, LINE_FMT, tmpbuf);
2060 if(len >= length) {
2061 read_unlock(&head->lock);
2062 goto out;
2063 }
2064 }
2065 read_unlock(&head->lock);
2066 }
2067
2068 out:
2069 local_bh_enable();
2070 out_no_bh:
2071
2072 begin = len - (pos - offset);
2073 *start = buffer + begin;
2074 len -= begin;
2075 if(len > length)
2076 len = length;
2077 if (len < 0)
2078 len = 0;
2079 return len;
2080 }
2081
2082 struct proto tcpv6_prot = {
2083 name: "TCPv6",
2084 close: tcp_close,
2085 connect: tcp_v6_connect,
2086 disconnect: tcp_disconnect,
2087 accept: tcp_accept,
2088 ioctl: tcp_ioctl,
2089 init: tcp_v6_init_sock,
2090 destroy: tcp_v6_destroy_sock,
2091 shutdown: tcp_shutdown,
2092 setsockopt: tcp_setsockopt,
2093 getsockopt: tcp_getsockopt,
2094 sendmsg: tcp_sendmsg,
2095 recvmsg: tcp_recvmsg,
2096 backlog_rcv: tcp_v6_do_rcv,
2097 hash: tcp_v6_hash,
2098 unhash: tcp_unhash,
2099 get_port: tcp_v6_get_port,
2100 };
2101
2102 static struct inet6_protocol tcpv6_protocol =
2103 {
2104 tcp_v6_rcv, /* TCP handler */
2105 tcp_v6_err, /* TCP error control */
2106 NULL, /* next */
2107 IPPROTO_TCP, /* protocol ID */
2108 0, /* copy */
2109 NULL, /* data */
2110 "TCPv6" /* name */
2111 };
2112
2113 void __init tcpv6_init(void)
2114 {
2115 /* register inet6 protocol */
2116 inet6_add_protocol(&tcpv6_protocol);
2117 }
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