1 /*
2 * TCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on:
9 * linux/net/ipv4/tcp.c
10 * linux/net/ipv4/tcp_input.c
11 * linux/net/ipv4/tcp_output.c
12 *
13 * Fixes:
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
16 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
17 * a single port at the same time.
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/bottom_half.h>
27 #include <linux/module.h>
28 #include <linux/errno.h>
29 #include <linux/types.h>
30 #include <linux/socket.h>
31 #include <linux/sockios.h>
32 #include <linux/net.h>
33 #include <linux/jiffies.h>
34 #include <linux/in.h>
35 #include <linux/in6.h>
36 #include <linux/netdevice.h>
37 #include <linux/init.h>
38 #include <linux/jhash.h>
39 #include <linux/ipsec.h>
40 #include <linux/times.h>
41
42 #include <linux/ipv6.h>
43 #include <linux/icmpv6.h>
44 #include <linux/random.h>
45
46 #include <net/tcp.h>
47 #include <net/ndisc.h>
48 #include <net/inet6_hashtables.h>
49 #include <net/inet6_connection_sock.h>
50 #include <net/ipv6.h>
51 #include <net/transp_v6.h>
52 #include <net/addrconf.h>
53 #include <net/ip6_route.h>
54 #include <net/ip6_checksum.h>
55 #include <net/inet_ecn.h>
56 #include <net/protocol.h>
57 #include <net/xfrm.h>
58 #include <net/snmp.h>
59 #include <net/dsfield.h>
60 #include <net/timewait_sock.h>
61 #include <net/netdma.h>
62 #include <net/inet_common.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 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
73 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
74 struct request_sock *req);
75
76 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
77
78 static struct inet_connection_sock_af_ops ipv6_mapped;
79 static struct inet_connection_sock_af_ops ipv6_specific;
80 #ifdef CONFIG_TCP_MD5SIG
81 static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
82 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
83 #else
84 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
85 struct in6_addr *addr)
86 {
87 return NULL;
88 }
89 #endif
90
91 static void tcp_v6_hash(struct sock *sk)
92 {
93 if (sk->sk_state != TCP_CLOSE) {
94 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
95 tcp_prot.hash(sk);
96 return;
97 }
98 local_bh_disable();
99 __inet6_hash(sk);
100 local_bh_enable();
101 }
102 }
103
104 static __inline__ __sum16 tcp_v6_check(int len,
105 struct in6_addr *saddr,
106 struct in6_addr *daddr,
107 __wsum base)
108 {
109 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
110 }
111
112 static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
113 {
114 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
115 ipv6_hdr(skb)->saddr.s6_addr32,
116 tcp_hdr(skb)->dest,
117 tcp_hdr(skb)->source);
118 }
119
120 static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
121 int addr_len)
122 {
123 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
124 struct inet_sock *inet = inet_sk(sk);
125 struct inet_connection_sock *icsk = inet_csk(sk);
126 struct ipv6_pinfo *np = inet6_sk(sk);
127 struct tcp_sock *tp = tcp_sk(sk);
128 struct in6_addr *saddr = NULL, *final_p = NULL, final;
129 struct flowi fl;
130 struct dst_entry *dst;
131 int addr_type;
132 int err;
133
134 if (addr_len < SIN6_LEN_RFC2133)
135 return -EINVAL;
136
137 if (usin->sin6_family != AF_INET6)
138 return(-EAFNOSUPPORT);
139
140 memset(&fl, 0, sizeof(fl));
141
142 if (np->sndflow) {
143 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
144 IP6_ECN_flow_init(fl.fl6_flowlabel);
145 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
146 struct ip6_flowlabel *flowlabel;
147 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
148 if (flowlabel == NULL)
149 return -EINVAL;
150 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
151 fl6_sock_release(flowlabel);
152 }
153 }
154
155 /*
156 * connect() to INADDR_ANY means loopback (BSD'ism).
157 */
158
159 if(ipv6_addr_any(&usin->sin6_addr))
160 usin->sin6_addr.s6_addr[15] = 0x1;
161
162 addr_type = ipv6_addr_type(&usin->sin6_addr);
163
164 if(addr_type & IPV6_ADDR_MULTICAST)
165 return -ENETUNREACH;
166
167 if (addr_type&IPV6_ADDR_LINKLOCAL) {
168 if (addr_len >= sizeof(struct sockaddr_in6) &&
169 usin->sin6_scope_id) {
170 /* If interface is set while binding, indices
171 * must coincide.
172 */
173 if (sk->sk_bound_dev_if &&
174 sk->sk_bound_dev_if != usin->sin6_scope_id)
175 return -EINVAL;
176
177 sk->sk_bound_dev_if = usin->sin6_scope_id;
178 }
179
180 /* Connect to link-local address requires an interface */
181 if (!sk->sk_bound_dev_if)
182 return -EINVAL;
183 }
184
185 if (tp->rx_opt.ts_recent_stamp &&
186 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
187 tp->rx_opt.ts_recent = 0;
188 tp->rx_opt.ts_recent_stamp = 0;
189 tp->write_seq = 0;
190 }
191
192 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
193 np->flow_label = fl.fl6_flowlabel;
194
195 /*
196 * TCP over IPv4
197 */
198
199 if (addr_type == IPV6_ADDR_MAPPED) {
200 u32 exthdrlen = icsk->icsk_ext_hdr_len;
201 struct sockaddr_in sin;
202
203 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
204
205 if (__ipv6_only_sock(sk))
206 return -ENETUNREACH;
207
208 sin.sin_family = AF_INET;
209 sin.sin_port = usin->sin6_port;
210 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
211
212 icsk->icsk_af_ops = &ipv6_mapped;
213 sk->sk_backlog_rcv = tcp_v4_do_rcv;
214 #ifdef CONFIG_TCP_MD5SIG
215 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
216 #endif
217
218 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
219
220 if (err) {
221 icsk->icsk_ext_hdr_len = exthdrlen;
222 icsk->icsk_af_ops = &ipv6_specific;
223 sk->sk_backlog_rcv = tcp_v6_do_rcv;
224 #ifdef CONFIG_TCP_MD5SIG
225 tp->af_specific = &tcp_sock_ipv6_specific;
226 #endif
227 goto failure;
228 } else {
229 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
230 inet->saddr);
231 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
232 inet->rcv_saddr);
233 }
234
235 return err;
236 }
237
238 if (!ipv6_addr_any(&np->rcv_saddr))
239 saddr = &np->rcv_saddr;
240
241 fl.proto = IPPROTO_TCP;
242 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
243 ipv6_addr_copy(&fl.fl6_src,
244 (saddr ? saddr : &np->saddr));
245 fl.oif = sk->sk_bound_dev_if;
246 fl.fl_ip_dport = usin->sin6_port;
247 fl.fl_ip_sport = inet->sport;
248
249 if (np->opt && np->opt->srcrt) {
250 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
251 ipv6_addr_copy(&final, &fl.fl6_dst);
252 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
253 final_p = &final;
254 }
255
256 security_sk_classify_flow(sk, &fl);
257
258 err = ip6_dst_lookup(sk, &dst, &fl);
259 if (err)
260 goto failure;
261 if (final_p)
262 ipv6_addr_copy(&fl.fl6_dst, final_p);
263
264 err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT);
265 if (err < 0) {
266 if (err == -EREMOTE)
267 err = ip6_dst_blackhole(sk, &dst, &fl);
268 if (err < 0)
269 goto failure;
270 }
271
272 if (saddr == NULL) {
273 saddr = &fl.fl6_src;
274 ipv6_addr_copy(&np->rcv_saddr, saddr);
275 }
276
277 /* set the source address */
278 ipv6_addr_copy(&np->saddr, saddr);
279 inet->rcv_saddr = LOOPBACK4_IPV6;
280
281 sk->sk_gso_type = SKB_GSO_TCPV6;
282 __ip6_dst_store(sk, dst, NULL, NULL);
283
284 icsk->icsk_ext_hdr_len = 0;
285 if (np->opt)
286 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
287 np->opt->opt_nflen);
288
289 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
290
291 inet->dport = usin->sin6_port;
292
293 tcp_set_state(sk, TCP_SYN_SENT);
294 err = inet6_hash_connect(&tcp_death_row, sk);
295 if (err)
296 goto late_failure;
297
298 if (!tp->write_seq)
299 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
300 np->daddr.s6_addr32,
301 inet->sport,
302 inet->dport);
303
304 err = tcp_connect(sk);
305 if (err)
306 goto late_failure;
307
308 return 0;
309
310 late_failure:
311 tcp_set_state(sk, TCP_CLOSE);
312 __sk_dst_reset(sk);
313 failure:
314 inet->dport = 0;
315 sk->sk_route_caps = 0;
316 return err;
317 }
318
319 static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
320 u8 type, u8 code, int offset, __be32 info)
321 {
322 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
323 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
324 struct ipv6_pinfo *np;
325 struct sock *sk;
326 int err;
327 struct tcp_sock *tp;
328 __u32 seq;
329 struct net *net = dev_net(skb->dev);
330
331 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
332 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
333
334 if (sk == NULL) {
335 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
336 ICMP6_MIB_INERRORS);
337 return;
338 }
339
340 if (sk->sk_state == TCP_TIME_WAIT) {
341 inet_twsk_put(inet_twsk(sk));
342 return;
343 }
344
345 bh_lock_sock(sk);
346 if (sock_owned_by_user(sk))
347 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
348
349 if (sk->sk_state == TCP_CLOSE)
350 goto out;
351
352 tp = tcp_sk(sk);
353 seq = ntohl(th->seq);
354 if (sk->sk_state != TCP_LISTEN &&
355 !between(seq, tp->snd_una, tp->snd_nxt)) {
356 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
357 goto out;
358 }
359
360 np = inet6_sk(sk);
361
362 if (type == ICMPV6_PKT_TOOBIG) {
363 struct dst_entry *dst = NULL;
364
365 if (sock_owned_by_user(sk))
366 goto out;
367 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
368 goto out;
369
370 /* icmp should have updated the destination cache entry */
371 dst = __sk_dst_check(sk, np->dst_cookie);
372
373 if (dst == NULL) {
374 struct inet_sock *inet = inet_sk(sk);
375 struct flowi fl;
376
377 /* BUGGG_FUTURE: Again, it is not clear how
378 to handle rthdr case. Ignore this complexity
379 for now.
380 */
381 memset(&fl, 0, sizeof(fl));
382 fl.proto = IPPROTO_TCP;
383 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
384 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
385 fl.oif = sk->sk_bound_dev_if;
386 fl.fl_ip_dport = inet->dport;
387 fl.fl_ip_sport = inet->sport;
388 security_skb_classify_flow(skb, &fl);
389
390 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
391 sk->sk_err_soft = -err;
392 goto out;
393 }
394
395 if ((err = xfrm_lookup(net, &dst, &fl, sk, 0)) < 0) {
396 sk->sk_err_soft = -err;
397 goto out;
398 }
399
400 } else
401 dst_hold(dst);
402
403 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
404 tcp_sync_mss(sk, dst_mtu(dst));
405 tcp_simple_retransmit(sk);
406 } /* else let the usual retransmit timer handle it */
407 dst_release(dst);
408 goto out;
409 }
410
411 icmpv6_err_convert(type, code, &err);
412
413 /* Might be for an request_sock */
414 switch (sk->sk_state) {
415 struct request_sock *req, **prev;
416 case TCP_LISTEN:
417 if (sock_owned_by_user(sk))
418 goto out;
419
420 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
421 &hdr->saddr, inet6_iif(skb));
422 if (!req)
423 goto out;
424
425 /* ICMPs are not backlogged, hence we cannot get
426 * an established socket here.
427 */
428 WARN_ON(req->sk != NULL);
429
430 if (seq != tcp_rsk(req)->snt_isn) {
431 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
432 goto out;
433 }
434
435 inet_csk_reqsk_queue_drop(sk, req, prev);
436 goto out;
437
438 case TCP_SYN_SENT:
439 case TCP_SYN_RECV: /* Cannot happen.
440 It can, it SYNs are crossed. --ANK */
441 if (!sock_owned_by_user(sk)) {
442 sk->sk_err = err;
443 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
444
445 tcp_done(sk);
446 } else
447 sk->sk_err_soft = err;
448 goto out;
449 }
450
451 if (!sock_owned_by_user(sk) && np->recverr) {
452 sk->sk_err = err;
453 sk->sk_error_report(sk);
454 } else
455 sk->sk_err_soft = err;
456
457 out:
458 bh_unlock_sock(sk);
459 sock_put(sk);
460 }
461
462
463 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
464 {
465 struct inet6_request_sock *treq = inet6_rsk(req);
466 struct ipv6_pinfo *np = inet6_sk(sk);
467 struct sk_buff * skb;
468 struct ipv6_txoptions *opt = NULL;
469 struct in6_addr * final_p = NULL, final;
470 struct flowi fl;
471 struct dst_entry *dst;
472 int err = -1;
473
474 memset(&fl, 0, sizeof(fl));
475 fl.proto = IPPROTO_TCP;
476 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
477 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
478 fl.fl6_flowlabel = 0;
479 fl.oif = treq->iif;
480 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
481 fl.fl_ip_sport = inet_rsk(req)->loc_port;
482 security_req_classify_flow(req, &fl);
483
484 opt = np->opt;
485 if (opt && opt->srcrt) {
486 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
487 ipv6_addr_copy(&final, &fl.fl6_dst);
488 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
489 final_p = &final;
490 }
491
492 err = ip6_dst_lookup(sk, &dst, &fl);
493 if (err)
494 goto done;
495 if (final_p)
496 ipv6_addr_copy(&fl.fl6_dst, final_p);
497 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
498 goto done;
499
500 skb = tcp_make_synack(sk, dst, req);
501 if (skb) {
502 struct tcphdr *th = tcp_hdr(skb);
503
504 th->check = tcp_v6_check(skb->len,
505 &treq->loc_addr, &treq->rmt_addr,
506 csum_partial(th, skb->len, skb->csum));
507
508 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
509 err = ip6_xmit(sk, skb, &fl, opt, 0);
510 err = net_xmit_eval(err);
511 }
512
513 done:
514 if (opt && opt != np->opt)
515 sock_kfree_s(sk, opt, opt->tot_len);
516 dst_release(dst);
517 return err;
518 }
519
520 static inline void syn_flood_warning(struct sk_buff *skb)
521 {
522 #ifdef CONFIG_SYN_COOKIES
523 if (sysctl_tcp_syncookies)
524 printk(KERN_INFO
525 "TCPv6: Possible SYN flooding on port %d. "
526 "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
527 else
528 #endif
529 printk(KERN_INFO
530 "TCPv6: Possible SYN flooding on port %d. "
531 "Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
532 }
533
534 static void tcp_v6_reqsk_destructor(struct request_sock *req)
535 {
536 kfree_skb(inet6_rsk(req)->pktopts);
537 }
538
539 #ifdef CONFIG_TCP_MD5SIG
540 static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
541 struct in6_addr *addr)
542 {
543 struct tcp_sock *tp = tcp_sk(sk);
544 int i;
545
546 BUG_ON(tp == NULL);
547
548 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
549 return NULL;
550
551 for (i = 0; i < tp->md5sig_info->entries6; i++) {
552 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
553 return &tp->md5sig_info->keys6[i].base;
554 }
555 return NULL;
556 }
557
558 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
559 struct sock *addr_sk)
560 {
561 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
562 }
563
564 static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
565 struct request_sock *req)
566 {
567 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
568 }
569
570 static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
571 char *newkey, u8 newkeylen)
572 {
573 /* Add key to the list */
574 struct tcp_md5sig_key *key;
575 struct tcp_sock *tp = tcp_sk(sk);
576 struct tcp6_md5sig_key *keys;
577
578 key = tcp_v6_md5_do_lookup(sk, peer);
579 if (key) {
580 /* modify existing entry - just update that one */
581 kfree(key->key);
582 key->key = newkey;
583 key->keylen = newkeylen;
584 } else {
585 /* reallocate new list if current one is full. */
586 if (!tp->md5sig_info) {
587 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
588 if (!tp->md5sig_info) {
589 kfree(newkey);
590 return -ENOMEM;
591 }
592 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
593 }
594 if (tcp_alloc_md5sig_pool() == NULL) {
595 kfree(newkey);
596 return -ENOMEM;
597 }
598 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
599 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
600 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
601
602 if (!keys) {
603 tcp_free_md5sig_pool();
604 kfree(newkey);
605 return -ENOMEM;
606 }
607
608 if (tp->md5sig_info->entries6)
609 memmove(keys, tp->md5sig_info->keys6,
610 (sizeof (tp->md5sig_info->keys6[0]) *
611 tp->md5sig_info->entries6));
612
613 kfree(tp->md5sig_info->keys6);
614 tp->md5sig_info->keys6 = keys;
615 tp->md5sig_info->alloced6++;
616 }
617
618 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
619 peer);
620 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
621 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
622
623 tp->md5sig_info->entries6++;
624 }
625 return 0;
626 }
627
628 static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
629 u8 *newkey, __u8 newkeylen)
630 {
631 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
632 newkey, newkeylen);
633 }
634
635 static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
636 {
637 struct tcp_sock *tp = tcp_sk(sk);
638 int i;
639
640 for (i = 0; i < tp->md5sig_info->entries6; i++) {
641 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
642 /* Free the key */
643 kfree(tp->md5sig_info->keys6[i].base.key);
644 tp->md5sig_info->entries6--;
645
646 if (tp->md5sig_info->entries6 == 0) {
647 kfree(tp->md5sig_info->keys6);
648 tp->md5sig_info->keys6 = NULL;
649 tp->md5sig_info->alloced6 = 0;
650 } else {
651 /* shrink the database */
652 if (tp->md5sig_info->entries6 != i)
653 memmove(&tp->md5sig_info->keys6[i],
654 &tp->md5sig_info->keys6[i+1],
655 (tp->md5sig_info->entries6 - i)
656 * sizeof (tp->md5sig_info->keys6[0]));
657 }
658 tcp_free_md5sig_pool();
659 return 0;
660 }
661 }
662 return -ENOENT;
663 }
664
665 static void tcp_v6_clear_md5_list (struct sock *sk)
666 {
667 struct tcp_sock *tp = tcp_sk(sk);
668 int i;
669
670 if (tp->md5sig_info->entries6) {
671 for (i = 0; i < tp->md5sig_info->entries6; i++)
672 kfree(tp->md5sig_info->keys6[i].base.key);
673 tp->md5sig_info->entries6 = 0;
674 tcp_free_md5sig_pool();
675 }
676
677 kfree(tp->md5sig_info->keys6);
678 tp->md5sig_info->keys6 = NULL;
679 tp->md5sig_info->alloced6 = 0;
680
681 if (tp->md5sig_info->entries4) {
682 for (i = 0; i < tp->md5sig_info->entries4; i++)
683 kfree(tp->md5sig_info->keys4[i].base.key);
684 tp->md5sig_info->entries4 = 0;
685 tcp_free_md5sig_pool();
686 }
687
688 kfree(tp->md5sig_info->keys4);
689 tp->md5sig_info->keys4 = NULL;
690 tp->md5sig_info->alloced4 = 0;
691 }
692
693 static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
694 int optlen)
695 {
696 struct tcp_md5sig cmd;
697 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
698 u8 *newkey;
699
700 if (optlen < sizeof(cmd))
701 return -EINVAL;
702
703 if (copy_from_user(&cmd, optval, sizeof(cmd)))
704 return -EFAULT;
705
706 if (sin6->sin6_family != AF_INET6)
707 return -EINVAL;
708
709 if (!cmd.tcpm_keylen) {
710 if (!tcp_sk(sk)->md5sig_info)
711 return -ENOENT;
712 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
713 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
714 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
715 }
716
717 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
718 return -EINVAL;
719
720 if (!tcp_sk(sk)->md5sig_info) {
721 struct tcp_sock *tp = tcp_sk(sk);
722 struct tcp_md5sig_info *p;
723
724 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
725 if (!p)
726 return -ENOMEM;
727
728 tp->md5sig_info = p;
729 sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
730 }
731
732 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
733 if (!newkey)
734 return -ENOMEM;
735 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
736 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
737 newkey, cmd.tcpm_keylen);
738 }
739 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
740 }
741
742 static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
743 struct in6_addr *daddr,
744 struct in6_addr *saddr, int nbytes)
745 {
746 struct tcp6_pseudohdr *bp;
747 struct scatterlist sg;
748
749 bp = &hp->md5_blk.ip6;
750 /* 1. TCP pseudo-header (RFC2460) */
751 ipv6_addr_copy(&bp->saddr, saddr);
752 ipv6_addr_copy(&bp->daddr, daddr);
753 bp->protocol = cpu_to_be32(IPPROTO_TCP);
754 bp->len = cpu_to_be32(nbytes);
755
756 sg_init_one(&sg, bp, sizeof(*bp));
757 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
758 }
759
760 static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
761 struct in6_addr *daddr, struct in6_addr *saddr,
762 struct tcphdr *th)
763 {
764 struct tcp_md5sig_pool *hp;
765 struct hash_desc *desc;
766
767 hp = tcp_get_md5sig_pool();
768 if (!hp)
769 goto clear_hash_noput;
770 desc = &hp->md5_desc;
771
772 if (crypto_hash_init(desc))
773 goto clear_hash;
774 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
775 goto clear_hash;
776 if (tcp_md5_hash_header(hp, th))
777 goto clear_hash;
778 if (tcp_md5_hash_key(hp, key))
779 goto clear_hash;
780 if (crypto_hash_final(desc, md5_hash))
781 goto clear_hash;
782
783 tcp_put_md5sig_pool();
784 return 0;
785
786 clear_hash:
787 tcp_put_md5sig_pool();
788 clear_hash_noput:
789 memset(md5_hash, 0, 16);
790 return 1;
791 }
792
793 static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
794 struct sock *sk, struct request_sock *req,
795 struct sk_buff *skb)
796 {
797 struct in6_addr *saddr, *daddr;
798 struct tcp_md5sig_pool *hp;
799 struct hash_desc *desc;
800 struct tcphdr *th = tcp_hdr(skb);
801
802 if (sk) {
803 saddr = &inet6_sk(sk)->saddr;
804 daddr = &inet6_sk(sk)->daddr;
805 } else if (req) {
806 saddr = &inet6_rsk(req)->loc_addr;
807 daddr = &inet6_rsk(req)->rmt_addr;
808 } else {
809 struct ipv6hdr *ip6h = ipv6_hdr(skb);
810 saddr = &ip6h->saddr;
811 daddr = &ip6h->daddr;
812 }
813
814 hp = tcp_get_md5sig_pool();
815 if (!hp)
816 goto clear_hash_noput;
817 desc = &hp->md5_desc;
818
819 if (crypto_hash_init(desc))
820 goto clear_hash;
821
822 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
823 goto clear_hash;
824 if (tcp_md5_hash_header(hp, th))
825 goto clear_hash;
826 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
827 goto clear_hash;
828 if (tcp_md5_hash_key(hp, key))
829 goto clear_hash;
830 if (crypto_hash_final(desc, md5_hash))
831 goto clear_hash;
832
833 tcp_put_md5sig_pool();
834 return 0;
835
836 clear_hash:
837 tcp_put_md5sig_pool();
838 clear_hash_noput:
839 memset(md5_hash, 0, 16);
840 return 1;
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 genhash;
850 u8 newhash[16];
851
852 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
853 hash_location = tcp_parse_md5sig_option(th);
854
855 /* We've parsed the options - do we have a hash? */
856 if (!hash_expected && !hash_location)
857 return 0;
858
859 if (hash_expected && !hash_location) {
860 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
861 return 1;
862 }
863
864 if (!hash_expected && hash_location) {
865 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
866 return 1;
867 }
868
869 /* check the signature */
870 genhash = tcp_v6_md5_hash_skb(newhash,
871 hash_expected,
872 NULL, NULL, skb);
873
874 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
875 if (net_ratelimit()) {
876 printk(KERN_INFO "MD5 Hash %s for (%pI6, %u)->(%pI6, %u)\n",
877 genhash ? "failed" : "mismatch",
878 &ip6h->saddr, ntohs(th->source),
879 &ip6h->daddr, ntohs(th->dest));
880 }
881 return 1;
882 }
883 return 0;
884 }
885 #endif
886
887 struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
888 .family = AF_INET6,
889 .obj_size = sizeof(struct tcp6_request_sock),
890 .rtx_syn_ack = tcp_v6_send_synack,
891 .send_ack = tcp_v6_reqsk_send_ack,
892 .destructor = tcp_v6_reqsk_destructor,
893 .send_reset = tcp_v6_send_reset
894 };
895
896 #ifdef CONFIG_TCP_MD5SIG
897 static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
898 .md5_lookup = tcp_v6_reqsk_md5_lookup,
899 .calc_md5_hash = tcp_v6_md5_hash_skb,
900 };
901 #endif
902
903 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
904 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
905 .twsk_unique = tcp_twsk_unique,
906 .twsk_destructor= tcp_twsk_destructor,
907 };
908
909 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
910 {
911 struct ipv6_pinfo *np = inet6_sk(sk);
912 struct tcphdr *th = tcp_hdr(skb);
913
914 if (skb->ip_summed == CHECKSUM_PARTIAL) {
915 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
916 skb->csum_start = skb_transport_header(skb) - skb->head;
917 skb->csum_offset = offsetof(struct tcphdr, check);
918 } else {
919 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
920 csum_partial(th, th->doff<<2,
921 skb->csum));
922 }
923 }
924
925 static int tcp_v6_gso_send_check(struct sk_buff *skb)
926 {
927 struct ipv6hdr *ipv6h;
928 struct tcphdr *th;
929
930 if (!pskb_may_pull(skb, sizeof(*th)))
931 return -EINVAL;
932
933 ipv6h = ipv6_hdr(skb);
934 th = tcp_hdr(skb);
935
936 th->check = 0;
937 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
938 IPPROTO_TCP, 0);
939 skb->csum_start = skb_transport_header(skb) - skb->head;
940 skb->csum_offset = offsetof(struct tcphdr, check);
941 skb->ip_summed = CHECKSUM_PARTIAL;
942 return 0;
943 }
944
945 static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
946 struct sk_buff *skb)
947 {
948 struct ipv6hdr *iph = skb_gro_network_header(skb);
949
950 switch (skb->ip_summed) {
951 case CHECKSUM_COMPLETE:
952 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
953 skb->csum)) {
954 skb->ip_summed = CHECKSUM_UNNECESSARY;
955 break;
956 }
957
958 /* fall through */
959 case CHECKSUM_NONE:
960 NAPI_GRO_CB(skb)->flush = 1;
961 return NULL;
962 }
963
964 return tcp_gro_receive(head, skb);
965 }
966
967 static int tcp6_gro_complete(struct sk_buff *skb)
968 {
969 struct ipv6hdr *iph = ipv6_hdr(skb);
970 struct tcphdr *th = tcp_hdr(skb);
971
972 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
973 &iph->saddr, &iph->daddr, 0);
974 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
975
976 return tcp_gro_complete(skb);
977 }
978
979 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
980 u32 ts, struct tcp_md5sig_key *key, int rst)
981 {
982 struct tcphdr *th = tcp_hdr(skb), *t1;
983 struct sk_buff *buff;
984 struct flowi fl;
985 struct net *net = dev_net(skb_dst(skb)->dev);
986 struct sock *ctl_sk = net->ipv6.tcp_sk;
987 unsigned int tot_len = sizeof(struct tcphdr);
988 struct dst_entry *dst;
989 __be32 *topt;
990
991 if (ts)
992 tot_len += TCPOLEN_TSTAMP_ALIGNED;
993 #ifdef CONFIG_TCP_MD5SIG
994 if (key)
995 tot_len += TCPOLEN_MD5SIG_ALIGNED;
996 #endif
997
998 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
999 GFP_ATOMIC);
1000 if (buff == NULL)
1001 return;
1002
1003 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
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 = !rst || !th->ack;
1015 t1->rst = rst;
1016 t1->window = htons(win);
1017
1018 topt = (__be32 *)(t1 + 1);
1019
1020 if (ts) {
1021 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1022 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1023 *topt++ = htonl(tcp_time_stamp);
1024 *topt++ = htonl(ts);
1025 }
1026
1027 #ifdef CONFIG_TCP_MD5SIG
1028 if (key) {
1029 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1030 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1031 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1032 &ipv6_hdr(skb)->saddr,
1033 &ipv6_hdr(skb)->daddr, t1);
1034 }
1035 #endif
1036
1037 buff->csum = csum_partial(t1, tot_len, 0);
1038
1039 memset(&fl, 0, sizeof(fl));
1040 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1041 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1042
1043 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1044 tot_len, IPPROTO_TCP,
1045 buff->csum);
1046
1047 fl.proto = IPPROTO_TCP;
1048 fl.oif = inet6_iif(skb);
1049 fl.fl_ip_dport = t1->dest;
1050 fl.fl_ip_sport = t1->source;
1051 security_skb_classify_flow(skb, &fl);
1052
1053 /* Pass a socket to ip6_dst_lookup either it is for RST
1054 * Underlying function will use this to retrieve the network
1055 * namespace
1056 */
1057 if (!ip6_dst_lookup(ctl_sk, &dst, &fl)) {
1058 if (xfrm_lookup(net, &dst, &fl, NULL, 0) >= 0) {
1059 skb_dst_set(buff, dst);
1060 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1061 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1062 if (rst)
1063 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1064 return;
1065 }
1066 }
1067
1068 kfree_skb(buff);
1069 }
1070
1071 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1072 {
1073 struct tcphdr *th = tcp_hdr(skb);
1074 u32 seq = 0, ack_seq = 0;
1075 struct tcp_md5sig_key *key = NULL;
1076
1077 if (th->rst)
1078 return;
1079
1080 if (!ipv6_unicast_destination(skb))
1081 return;
1082
1083 #ifdef CONFIG_TCP_MD5SIG
1084 if (sk)
1085 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1086 #endif
1087
1088 if (th->ack)
1089 seq = ntohl(th->ack_seq);
1090 else
1091 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
1092 (th->doff << 2);
1093
1094 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
1095 }
1096
1097 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1098 struct tcp_md5sig_key *key)
1099 {
1100 tcp_v6_send_response(skb, seq, ack, win, ts, key, 0);
1101 }
1102
1103 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1104 {
1105 struct inet_timewait_sock *tw = inet_twsk(sk);
1106 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1107
1108 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1109 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1110 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
1111
1112 inet_twsk_put(tw);
1113 }
1114
1115 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
1116 struct request_sock *req)
1117 {
1118 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1119 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
1120 }
1121
1122
1123 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1124 {
1125 struct request_sock *req, **prev;
1126 const struct tcphdr *th = tcp_hdr(skb);
1127 struct sock *nsk;
1128
1129 /* Find possible connection requests. */
1130 req = inet6_csk_search_req(sk, &prev, th->source,
1131 &ipv6_hdr(skb)->saddr,
1132 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1133 if (req)
1134 return tcp_check_req(sk, skb, req, prev);
1135
1136 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1137 &ipv6_hdr(skb)->saddr, th->source,
1138 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1139
1140 if (nsk) {
1141 if (nsk->sk_state != TCP_TIME_WAIT) {
1142 bh_lock_sock(nsk);
1143 return nsk;
1144 }
1145 inet_twsk_put(inet_twsk(nsk));
1146 return NULL;
1147 }
1148
1149 #ifdef CONFIG_SYN_COOKIES
1150 if (!th->rst && !th->syn && th->ack)
1151 sk = cookie_v6_check(sk, skb);
1152 #endif
1153 return sk;
1154 }
1155
1156 /* FIXME: this is substantially similar to the ipv4 code.
1157 * Can some kind of merge be done? -- erics
1158 */
1159 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1160 {
1161 struct inet6_request_sock *treq;
1162 struct ipv6_pinfo *np = inet6_sk(sk);
1163 struct tcp_options_received tmp_opt;
1164 struct tcp_sock *tp = tcp_sk(sk);
1165 struct request_sock *req = NULL;
1166 __u32 isn = TCP_SKB_CB(skb)->when;
1167 #ifdef CONFIG_SYN_COOKIES
1168 int want_cookie = 0;
1169 #else
1170 #define want_cookie 0
1171 #endif
1172
1173 if (skb->protocol == htons(ETH_P_IP))
1174 return tcp_v4_conn_request(sk, skb);
1175
1176 if (!ipv6_unicast_destination(skb))
1177 goto drop;
1178
1179 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1180 if (net_ratelimit())
1181 syn_flood_warning(skb);
1182 #ifdef CONFIG_SYN_COOKIES
1183 if (sysctl_tcp_syncookies)
1184 want_cookie = 1;
1185 else
1186 #endif
1187 goto drop;
1188 }
1189
1190 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1191 goto drop;
1192
1193 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1194 if (req == NULL)
1195 goto drop;
1196
1197 #ifdef CONFIG_TCP_MD5SIG
1198 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1199 #endif
1200
1201 tcp_clear_options(&tmp_opt);
1202 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1203 tmp_opt.user_mss = tp->rx_opt.user_mss;
1204
1205 tcp_parse_options(skb, &tmp_opt, 0);
1206
1207 if (want_cookie && !tmp_opt.saw_tstamp)
1208 tcp_clear_options(&tmp_opt);
1209
1210 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1211 tcp_openreq_init(req, &tmp_opt, skb);
1212
1213 treq = inet6_rsk(req);
1214 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1215 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1216 if (!want_cookie)
1217 TCP_ECN_create_request(req, tcp_hdr(skb));
1218
1219 if (want_cookie) {
1220 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1221 req->cookie_ts = tmp_opt.tstamp_ok;
1222 } else if (!isn) {
1223 if (ipv6_opt_accepted(sk, skb) ||
1224 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1225 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1226 atomic_inc(&skb->users);
1227 treq->pktopts = skb;
1228 }
1229 treq->iif = sk->sk_bound_dev_if;
1230
1231 /* So that link locals have meaning */
1232 if (!sk->sk_bound_dev_if &&
1233 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1234 treq->iif = inet6_iif(skb);
1235
1236 isn = tcp_v6_init_sequence(skb);
1237 }
1238
1239 tcp_rsk(req)->snt_isn = isn;
1240
1241 security_inet_conn_request(sk, skb, req);
1242
1243 if (tcp_v6_send_synack(sk, req))
1244 goto drop;
1245
1246 if (!want_cookie) {
1247 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1248 return 0;
1249 }
1250
1251 drop:
1252 if (req)
1253 reqsk_free(req);
1254
1255 return 0; /* don't send reset */
1256 }
1257
1258 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1259 struct request_sock *req,
1260 struct dst_entry *dst)
1261 {
1262 struct inet6_request_sock *treq;
1263 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1264 struct tcp6_sock *newtcp6sk;
1265 struct inet_sock *newinet;
1266 struct tcp_sock *newtp;
1267 struct sock *newsk;
1268 struct ipv6_txoptions *opt;
1269 #ifdef CONFIG_TCP_MD5SIG
1270 struct tcp_md5sig_key *key;
1271 #endif
1272
1273 if (skb->protocol == htons(ETH_P_IP)) {
1274 /*
1275 * v6 mapped
1276 */
1277
1278 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1279
1280 if (newsk == NULL)
1281 return NULL;
1282
1283 newtcp6sk = (struct tcp6_sock *)newsk;
1284 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1285
1286 newinet = inet_sk(newsk);
1287 newnp = inet6_sk(newsk);
1288 newtp = tcp_sk(newsk);
1289
1290 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1291
1292 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1293 newinet->daddr);
1294
1295 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1296 newinet->saddr);
1297
1298 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1299
1300 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1301 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1302 #ifdef CONFIG_TCP_MD5SIG
1303 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1304 #endif
1305
1306 newnp->pktoptions = NULL;
1307 newnp->opt = NULL;
1308 newnp->mcast_oif = inet6_iif(skb);
1309 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1310
1311 /*
1312 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1313 * here, tcp_create_openreq_child now does this for us, see the comment in
1314 * that function for the gory details. -acme
1315 */
1316
1317 /* It is tricky place. Until this moment IPv4 tcp
1318 worked with IPv6 icsk.icsk_af_ops.
1319 Sync it now.
1320 */
1321 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1322
1323 return newsk;
1324 }
1325
1326 treq = inet6_rsk(req);
1327 opt = np->opt;
1328
1329 if (sk_acceptq_is_full(sk))
1330 goto out_overflow;
1331
1332 if (dst == NULL) {
1333 struct in6_addr *final_p = NULL, final;
1334 struct flowi fl;
1335
1336 memset(&fl, 0, sizeof(fl));
1337 fl.proto = IPPROTO_TCP;
1338 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1339 if (opt && opt->srcrt) {
1340 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1341 ipv6_addr_copy(&final, &fl.fl6_dst);
1342 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1343 final_p = &final;
1344 }
1345 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1346 fl.oif = sk->sk_bound_dev_if;
1347 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1348 fl.fl_ip_sport = inet_rsk(req)->loc_port;
1349 security_req_classify_flow(req, &fl);
1350
1351 if (ip6_dst_lookup(sk, &dst, &fl))
1352 goto out;
1353
1354 if (final_p)
1355 ipv6_addr_copy(&fl.fl6_dst, final_p);
1356
1357 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
1358 goto out;
1359 }
1360
1361 newsk = tcp_create_openreq_child(sk, req, skb);
1362 if (newsk == NULL)
1363 goto out;
1364
1365 /*
1366 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1367 * count here, tcp_create_openreq_child now does this for us, see the
1368 * comment in that function for the gory details. -acme
1369 */
1370
1371 newsk->sk_gso_type = SKB_GSO_TCPV6;
1372 __ip6_dst_store(newsk, dst, NULL, NULL);
1373
1374 newtcp6sk = (struct tcp6_sock *)newsk;
1375 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1376
1377 newtp = tcp_sk(newsk);
1378 newinet = inet_sk(newsk);
1379 newnp = inet6_sk(newsk);
1380
1381 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1382
1383 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1384 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1385 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1386 newsk->sk_bound_dev_if = treq->iif;
1387
1388 /* Now IPv6 options...
1389
1390 First: no IPv4 options.
1391 */
1392 newinet->opt = NULL;
1393 newnp->ipv6_fl_list = NULL;
1394
1395 /* Clone RX bits */
1396 newnp->rxopt.all = np->rxopt.all;
1397
1398 /* Clone pktoptions received with SYN */
1399 newnp->pktoptions = NULL;
1400 if (treq->pktopts != NULL) {
1401 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1402 kfree_skb(treq->pktopts);
1403 treq->pktopts = NULL;
1404 if (newnp->pktoptions)
1405 skb_set_owner_r(newnp->pktoptions, newsk);
1406 }
1407 newnp->opt = NULL;
1408 newnp->mcast_oif = inet6_iif(skb);
1409 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1410
1411 /* Clone native IPv6 options from listening socket (if any)
1412
1413 Yes, keeping reference count would be much more clever,
1414 but we make one more one thing there: reattach optmem
1415 to newsk.
1416 */
1417 if (opt) {
1418 newnp->opt = ipv6_dup_options(newsk, opt);
1419 if (opt != np->opt)
1420 sock_kfree_s(sk, opt, opt->tot_len);
1421 }
1422
1423 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1424 if (newnp->opt)
1425 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1426 newnp->opt->opt_flen);
1427
1428 tcp_mtup_init(newsk);
1429 tcp_sync_mss(newsk, dst_mtu(dst));
1430 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1431 tcp_initialize_rcv_mss(newsk);
1432
1433 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1434
1435 #ifdef CONFIG_TCP_MD5SIG
1436 /* Copy over the MD5 key from the original socket */
1437 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1438 /* We're using one, so create a matching key
1439 * on the newsk structure. If we fail to get
1440 * memory, then we end up not copying the key
1441 * across. Shucks.
1442 */
1443 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1444 if (newkey != NULL)
1445 tcp_v6_md5_do_add(newsk, &newnp->daddr,
1446 newkey, key->keylen);
1447 }
1448 #endif
1449
1450 __inet6_hash(newsk);
1451 __inet_inherit_port(sk, newsk);
1452
1453 return newsk;
1454
1455 out_overflow:
1456 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1457 out:
1458 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1459 if (opt && opt != np->opt)
1460 sock_kfree_s(sk, opt, opt->tot_len);
1461 dst_release(dst);
1462 return NULL;
1463 }
1464
1465 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1466 {
1467 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1468 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1469 &ipv6_hdr(skb)->daddr, skb->csum)) {
1470 skb->ip_summed = CHECKSUM_UNNECESSARY;
1471 return 0;
1472 }
1473 }
1474
1475 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1476 &ipv6_hdr(skb)->saddr,
1477 &ipv6_hdr(skb)->daddr, 0));
1478
1479 if (skb->len <= 76) {
1480 return __skb_checksum_complete(skb);
1481 }
1482 return 0;
1483 }
1484
1485 /* The socket must have it's spinlock held when we get
1486 * here.
1487 *
1488 * We have a potential double-lock case here, so even when
1489 * doing backlog processing we use the BH locking scheme.
1490 * This is because we cannot sleep with the original spinlock
1491 * held.
1492 */
1493 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1494 {
1495 struct ipv6_pinfo *np = inet6_sk(sk);
1496 struct tcp_sock *tp;
1497 struct sk_buff *opt_skb = NULL;
1498
1499 /* Imagine: socket is IPv6. IPv4 packet arrives,
1500 goes to IPv4 receive handler and backlogged.
1501 From backlog it always goes here. Kerboom...
1502 Fortunately, tcp_rcv_established and rcv_established
1503 handle them correctly, but it is not case with
1504 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1505 */
1506
1507 if (skb->protocol == htons(ETH_P_IP))
1508 return tcp_v4_do_rcv(sk, skb);
1509
1510 #ifdef CONFIG_TCP_MD5SIG
1511 if (tcp_v6_inbound_md5_hash (sk, skb))
1512 goto discard;
1513 #endif
1514
1515 if (sk_filter(sk, skb))
1516 goto discard;
1517
1518 /*
1519 * socket locking is here for SMP purposes as backlog rcv
1520 * is currently called with bh processing disabled.
1521 */
1522
1523 /* Do Stevens' IPV6_PKTOPTIONS.
1524
1525 Yes, guys, it is the only place in our code, where we
1526 may make it not affecting IPv4.
1527 The rest of code is protocol independent,
1528 and I do not like idea to uglify IPv4.
1529
1530 Actually, all the idea behind IPV6_PKTOPTIONS
1531 looks not very well thought. For now we latch
1532 options, received in the last packet, enqueued
1533 by tcp. Feel free to propose better solution.
1534 --ANK (980728)
1535 */
1536 if (np->rxopt.all)
1537 opt_skb = skb_clone(skb, GFP_ATOMIC);
1538
1539 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1540 TCP_CHECK_TIMER(sk);
1541 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1542 goto reset;
1543 TCP_CHECK_TIMER(sk);
1544 if (opt_skb)
1545 goto ipv6_pktoptions;
1546 return 0;
1547 }
1548
1549 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1550 goto csum_err;
1551
1552 if (sk->sk_state == TCP_LISTEN) {
1553 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1554 if (!nsk)
1555 goto discard;
1556
1557 /*
1558 * Queue it on the new socket if the new socket is active,
1559 * otherwise we just shortcircuit this and continue with
1560 * the new socket..
1561 */
1562 if(nsk != sk) {
1563 if (tcp_child_process(sk, nsk, skb))
1564 goto reset;
1565 if (opt_skb)
1566 __kfree_skb(opt_skb);
1567 return 0;
1568 }
1569 }
1570
1571 TCP_CHECK_TIMER(sk);
1572 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1573 goto reset;
1574 TCP_CHECK_TIMER(sk);
1575 if (opt_skb)
1576 goto ipv6_pktoptions;
1577 return 0;
1578
1579 reset:
1580 tcp_v6_send_reset(sk, skb);
1581 discard:
1582 if (opt_skb)
1583 __kfree_skb(opt_skb);
1584 kfree_skb(skb);
1585 return 0;
1586 csum_err:
1587 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1588 goto discard;
1589
1590
1591 ipv6_pktoptions:
1592 /* Do you ask, what is it?
1593
1594 1. skb was enqueued by tcp.
1595 2. skb is added to tail of read queue, rather than out of order.
1596 3. socket is not in passive state.
1597 4. Finally, it really contains options, which user wants to receive.
1598 */
1599 tp = tcp_sk(sk);
1600 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1601 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1602 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1603 np->mcast_oif = inet6_iif(opt_skb);
1604 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1605 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1606 if (ipv6_opt_accepted(sk, opt_skb)) {
1607 skb_set_owner_r(opt_skb, sk);
1608 opt_skb = xchg(&np->pktoptions, opt_skb);
1609 } else {
1610 __kfree_skb(opt_skb);
1611 opt_skb = xchg(&np->pktoptions, NULL);
1612 }
1613 }
1614
1615 kfree_skb(opt_skb);
1616 return 0;
1617 }
1618
1619 static int tcp_v6_rcv(struct sk_buff *skb)
1620 {
1621 struct tcphdr *th;
1622 struct sock *sk;
1623 int ret;
1624 struct net *net = dev_net(skb->dev);
1625
1626 if (skb->pkt_type != PACKET_HOST)
1627 goto discard_it;
1628
1629 /*
1630 * Count it even if it's bad.
1631 */
1632 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1633
1634 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1635 goto discard_it;
1636
1637 th = tcp_hdr(skb);
1638
1639 if (th->doff < sizeof(struct tcphdr)/4)
1640 goto bad_packet;
1641 if (!pskb_may_pull(skb, th->doff*4))
1642 goto discard_it;
1643
1644 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1645 goto bad_packet;
1646
1647 th = tcp_hdr(skb);
1648 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1649 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1650 skb->len - th->doff*4);
1651 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1652 TCP_SKB_CB(skb)->when = 0;
1653 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1654 TCP_SKB_CB(skb)->sacked = 0;
1655
1656 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1657 if (!sk)
1658 goto no_tcp_socket;
1659
1660 process:
1661 if (sk->sk_state == TCP_TIME_WAIT)
1662 goto do_time_wait;
1663
1664 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1665 goto discard_and_relse;
1666
1667 if (sk_filter(sk, skb))
1668 goto discard_and_relse;
1669
1670 skb->dev = NULL;
1671
1672 bh_lock_sock_nested(sk);
1673 ret = 0;
1674 if (!sock_owned_by_user(sk)) {
1675 #ifdef CONFIG_NET_DMA
1676 struct tcp_sock *tp = tcp_sk(sk);
1677 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1678 tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1679 if (tp->ucopy.dma_chan)
1680 ret = tcp_v6_do_rcv(sk, skb);
1681 else
1682 #endif
1683 {
1684 if (!tcp_prequeue(sk, skb))
1685 ret = tcp_v6_do_rcv(sk, skb);
1686 }
1687 } else
1688 sk_add_backlog(sk, skb);
1689 bh_unlock_sock(sk);
1690
1691 sock_put(sk);
1692 return ret ? -1 : 0;
1693
1694 no_tcp_socket:
1695 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1696 goto discard_it;
1697
1698 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1699 bad_packet:
1700 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1701 } else {
1702 tcp_v6_send_reset(NULL, skb);
1703 }
1704
1705 discard_it:
1706
1707 /*
1708 * Discard frame
1709 */
1710
1711 kfree_skb(skb);
1712 return 0;
1713
1714 discard_and_relse:
1715 sock_put(sk);
1716 goto discard_it;
1717
1718 do_time_wait:
1719 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1720 inet_twsk_put(inet_twsk(sk));
1721 goto discard_it;
1722 }
1723
1724 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1725 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1726 inet_twsk_put(inet_twsk(sk));
1727 goto discard_it;
1728 }
1729
1730 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1731 case TCP_TW_SYN:
1732 {
1733 struct sock *sk2;
1734
1735 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1736 &ipv6_hdr(skb)->daddr,
1737 ntohs(th->dest), inet6_iif(skb));
1738 if (sk2 != NULL) {
1739 struct inet_timewait_sock *tw = inet_twsk(sk);
1740 inet_twsk_deschedule(tw, &tcp_death_row);
1741 inet_twsk_put(tw);
1742 sk = sk2;
1743 goto process;
1744 }
1745 /* Fall through to ACK */
1746 }
1747 case TCP_TW_ACK:
1748 tcp_v6_timewait_ack(sk, skb);
1749 break;
1750 case TCP_TW_RST:
1751 goto no_tcp_socket;
1752 case TCP_TW_SUCCESS:;
1753 }
1754 goto discard_it;
1755 }
1756
1757 static int tcp_v6_remember_stamp(struct sock *sk)
1758 {
1759 /* Alas, not yet... */
1760 return 0;
1761 }
1762
1763 static struct inet_connection_sock_af_ops ipv6_specific = {
1764 .queue_xmit = inet6_csk_xmit,
1765 .send_check = tcp_v6_send_check,
1766 .rebuild_header = inet6_sk_rebuild_header,
1767 .conn_request = tcp_v6_conn_request,
1768 .syn_recv_sock = tcp_v6_syn_recv_sock,
1769 .remember_stamp = tcp_v6_remember_stamp,
1770 .net_header_len = sizeof(struct ipv6hdr),
1771 .setsockopt = ipv6_setsockopt,
1772 .getsockopt = ipv6_getsockopt,
1773 .addr2sockaddr = inet6_csk_addr2sockaddr,
1774 .sockaddr_len = sizeof(struct sockaddr_in6),
1775 .bind_conflict = inet6_csk_bind_conflict,
1776 #ifdef CONFIG_COMPAT
1777 .compat_setsockopt = compat_ipv6_setsockopt,
1778 .compat_getsockopt = compat_ipv6_getsockopt,
1779 #endif
1780 };
1781
1782 #ifdef CONFIG_TCP_MD5SIG
1783 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1784 .md5_lookup = tcp_v6_md5_lookup,
1785 .calc_md5_hash = tcp_v6_md5_hash_skb,
1786 .md5_add = tcp_v6_md5_add_func,
1787 .md5_parse = tcp_v6_parse_md5_keys,
1788 };
1789 #endif
1790
1791 /*
1792 * TCP over IPv4 via INET6 API
1793 */
1794
1795 static struct inet_connection_sock_af_ops ipv6_mapped = {
1796 .queue_xmit = ip_queue_xmit,
1797 .send_check = tcp_v4_send_check,
1798 .rebuild_header = inet_sk_rebuild_header,
1799 .conn_request = tcp_v6_conn_request,
1800 .syn_recv_sock = tcp_v6_syn_recv_sock,
1801 .remember_stamp = tcp_v4_remember_stamp,
1802 .net_header_len = sizeof(struct iphdr),
1803 .setsockopt = ipv6_setsockopt,
1804 .getsockopt = ipv6_getsockopt,
1805 .addr2sockaddr = inet6_csk_addr2sockaddr,
1806 .sockaddr_len = sizeof(struct sockaddr_in6),
1807 .bind_conflict = inet6_csk_bind_conflict,
1808 #ifdef CONFIG_COMPAT
1809 .compat_setsockopt = compat_ipv6_setsockopt,
1810 .compat_getsockopt = compat_ipv6_getsockopt,
1811 #endif
1812 };
1813
1814 #ifdef CONFIG_TCP_MD5SIG
1815 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1816 .md5_lookup = tcp_v4_md5_lookup,
1817 .calc_md5_hash = tcp_v4_md5_hash_skb,
1818 .md5_add = tcp_v6_md5_add_func,
1819 .md5_parse = tcp_v6_parse_md5_keys,
1820 };
1821 #endif
1822
1823 /* NOTE: A lot of things set to zero explicitly by call to
1824 * sk_alloc() so need not be done here.
1825 */
1826 static int tcp_v6_init_sock(struct sock *sk)
1827 {
1828 struct inet_connection_sock *icsk = inet_csk(sk);
1829 struct tcp_sock *tp = tcp_sk(sk);
1830
1831 skb_queue_head_init(&tp->out_of_order_queue);
1832 tcp_init_xmit_timers(sk);
1833 tcp_prequeue_init(tp);
1834
1835 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1836 tp->mdev = TCP_TIMEOUT_INIT;
1837
1838 /* So many TCP implementations out there (incorrectly) count the
1839 * initial SYN frame in their delayed-ACK and congestion control
1840 * algorithms that we must have the following bandaid to talk
1841 * efficiently to them. -DaveM
1842 */
1843 tp->snd_cwnd = 2;
1844
1845 /* See draft-stevens-tcpca-spec-01 for discussion of the
1846 * initialization of these values.
1847 */
1848 tp->snd_ssthresh = 0x7fffffff;
1849 tp->snd_cwnd_clamp = ~0;
1850 tp->mss_cache = 536;
1851
1852 tp->reordering = sysctl_tcp_reordering;
1853
1854 sk->sk_state = TCP_CLOSE;
1855
1856 icsk->icsk_af_ops = &ipv6_specific;
1857 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1858 icsk->icsk_sync_mss = tcp_sync_mss;
1859 sk->sk_write_space = sk_stream_write_space;
1860 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1861
1862 #ifdef CONFIG_TCP_MD5SIG
1863 tp->af_specific = &tcp_sock_ipv6_specific;
1864 #endif
1865
1866 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1867 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1868
1869 local_bh_disable();
1870 percpu_counter_inc(&tcp_sockets_allocated);
1871 local_bh_enable();
1872
1873 return 0;
1874 }
1875
1876 static void tcp_v6_destroy_sock(struct sock *sk)
1877 {
1878 #ifdef CONFIG_TCP_MD5SIG
1879 /* Clean up the MD5 key list */
1880 if (tcp_sk(sk)->md5sig_info)
1881 tcp_v6_clear_md5_list(sk);
1882 #endif
1883 tcp_v4_destroy_sock(sk);
1884 inet6_destroy_sock(sk);
1885 }
1886
1887 #ifdef CONFIG_PROC_FS
1888 /* Proc filesystem TCPv6 sock list dumping. */
1889 static void get_openreq6(struct seq_file *seq,
1890 struct sock *sk, struct request_sock *req, int i, int uid)
1891 {
1892 int ttd = req->expires - jiffies;
1893 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1894 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1895
1896 if (ttd < 0)
1897 ttd = 0;
1898
1899 seq_printf(seq,
1900 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1901 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1902 i,
1903 src->s6_addr32[0], src->s6_addr32[1],
1904 src->s6_addr32[2], src->s6_addr32[3],
1905 ntohs(inet_rsk(req)->loc_port),
1906 dest->s6_addr32[0], dest->s6_addr32[1],
1907 dest->s6_addr32[2], dest->s6_addr32[3],
1908 ntohs(inet_rsk(req)->rmt_port),
1909 TCP_SYN_RECV,
1910 0,0, /* could print option size, but that is af dependent. */
1911 1, /* timers active (only the expire timer) */
1912 jiffies_to_clock_t(ttd),
1913 req->retrans,
1914 uid,
1915 0, /* non standard timer */
1916 0, /* open_requests have no inode */
1917 0, req);
1918 }
1919
1920 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1921 {
1922 struct in6_addr *dest, *src;
1923 __u16 destp, srcp;
1924 int timer_active;
1925 unsigned long timer_expires;
1926 struct inet_sock *inet = inet_sk(sp);
1927 struct tcp_sock *tp = tcp_sk(sp);
1928 const struct inet_connection_sock *icsk = inet_csk(sp);
1929 struct ipv6_pinfo *np = inet6_sk(sp);
1930
1931 dest = &np->daddr;
1932 src = &np->rcv_saddr;
1933 destp = ntohs(inet->dport);
1934 srcp = ntohs(inet->sport);
1935
1936 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1937 timer_active = 1;
1938 timer_expires = icsk->icsk_timeout;
1939 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1940 timer_active = 4;
1941 timer_expires = icsk->icsk_timeout;
1942 } else if (timer_pending(&sp->sk_timer)) {
1943 timer_active = 2;
1944 timer_expires = sp->sk_timer.expires;
1945 } else {
1946 timer_active = 0;
1947 timer_expires = jiffies;
1948 }
1949
1950 seq_printf(seq,
1951 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1952 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
1953 i,
1954 src->s6_addr32[0], src->s6_addr32[1],
1955 src->s6_addr32[2], src->s6_addr32[3], srcp,
1956 dest->s6_addr32[0], dest->s6_addr32[1],
1957 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1958 sp->sk_state,
1959 tp->write_seq-tp->snd_una,
1960 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1961 timer_active,
1962 jiffies_to_clock_t(timer_expires - jiffies),
1963 icsk->icsk_retransmits,
1964 sock_i_uid(sp),
1965 icsk->icsk_probes_out,
1966 sock_i_ino(sp),
1967 atomic_read(&sp->sk_refcnt), sp,
1968 jiffies_to_clock_t(icsk->icsk_rto),
1969 jiffies_to_clock_t(icsk->icsk_ack.ato),
1970 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
1971 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
1972 );
1973 }
1974
1975 static void get_timewait6_sock(struct seq_file *seq,
1976 struct inet_timewait_sock *tw, int i)
1977 {
1978 struct in6_addr *dest, *src;
1979 __u16 destp, srcp;
1980 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1981 int ttd = tw->tw_ttd - jiffies;
1982
1983 if (ttd < 0)
1984 ttd = 0;
1985
1986 dest = &tw6->tw_v6_daddr;
1987 src = &tw6->tw_v6_rcv_saddr;
1988 destp = ntohs(tw->tw_dport);
1989 srcp = ntohs(tw->tw_sport);
1990
1991 seq_printf(seq,
1992 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1993 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1994 i,
1995 src->s6_addr32[0], src->s6_addr32[1],
1996 src->s6_addr32[2], src->s6_addr32[3], srcp,
1997 dest->s6_addr32[0], dest->s6_addr32[1],
1998 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1999 tw->tw_substate, 0, 0,
2000 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2001 atomic_read(&tw->tw_refcnt), tw);
2002 }
2003
2004 static int tcp6_seq_show(struct seq_file *seq, void *v)
2005 {
2006 struct tcp_iter_state *st;
2007
2008 if (v == SEQ_START_TOKEN) {
2009 seq_puts(seq,
2010 " sl "
2011 "local_address "
2012 "remote_address "
2013 "st tx_queue rx_queue tr tm->when retrnsmt"
2014 " uid timeout inode\n");
2015 goto out;
2016 }
2017 st = seq->private;
2018
2019 switch (st->state) {
2020 case TCP_SEQ_STATE_LISTENING:
2021 case TCP_SEQ_STATE_ESTABLISHED:
2022 get_tcp6_sock(seq, v, st->num);
2023 break;
2024 case TCP_SEQ_STATE_OPENREQ:
2025 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2026 break;
2027 case TCP_SEQ_STATE_TIME_WAIT:
2028 get_timewait6_sock(seq, v, st->num);
2029 break;
2030 }
2031 out:
2032 return 0;
2033 }
2034
2035 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2036 .name = "tcp6",
2037 .family = AF_INET6,
2038 .seq_fops = {
2039 .owner = THIS_MODULE,
2040 },
2041 .seq_ops = {
2042 .show = tcp6_seq_show,
2043 },
2044 };
2045
2046 int tcp6_proc_init(struct net *net)
2047 {
2048 return tcp_proc_register(net, &tcp6_seq_afinfo);
2049 }
2050
2051 void tcp6_proc_exit(struct net *net)
2052 {
2053 tcp_proc_unregister(net, &tcp6_seq_afinfo);
2054 }
2055 #endif
2056
2057 struct proto tcpv6_prot = {
2058 .name = "TCPv6",
2059 .owner = THIS_MODULE,
2060 .close = tcp_close,
2061 .connect = tcp_v6_connect,
2062 .disconnect = tcp_disconnect,
2063 .accept = inet_csk_accept,
2064 .ioctl = tcp_ioctl,
2065 .init = tcp_v6_init_sock,
2066 .destroy = tcp_v6_destroy_sock,
2067 .shutdown = tcp_shutdown,
2068 .setsockopt = tcp_setsockopt,
2069 .getsockopt = tcp_getsockopt,
2070 .recvmsg = tcp_recvmsg,
2071 .backlog_rcv = tcp_v6_do_rcv,
2072 .hash = tcp_v6_hash,
2073 .unhash = inet_unhash,
2074 .get_port = inet_csk_get_port,
2075 .enter_memory_pressure = tcp_enter_memory_pressure,
2076 .sockets_allocated = &tcp_sockets_allocated,
2077 .memory_allocated = &tcp_memory_allocated,
2078 .memory_pressure = &tcp_memory_pressure,
2079 .orphan_count = &tcp_orphan_count,
2080 .sysctl_mem = sysctl_tcp_mem,
2081 .sysctl_wmem = sysctl_tcp_wmem,
2082 .sysctl_rmem = sysctl_tcp_rmem,
2083 .max_header = MAX_TCP_HEADER,
2084 .obj_size = sizeof(struct tcp6_sock),
2085 .slab_flags = SLAB_DESTROY_BY_RCU,
2086 .twsk_prot = &tcp6_timewait_sock_ops,
2087 .rsk_prot = &tcp6_request_sock_ops,
2088 .h.hashinfo = &tcp_hashinfo,
2089 #ifdef CONFIG_COMPAT
2090 .compat_setsockopt = compat_tcp_setsockopt,
2091 .compat_getsockopt = compat_tcp_getsockopt,
2092 #endif
2093 };
2094
2095 static struct inet6_protocol tcpv6_protocol = {
2096 .handler = tcp_v6_rcv,
2097 .err_handler = tcp_v6_err,
2098 .gso_send_check = tcp_v6_gso_send_check,
2099 .gso_segment = tcp_tso_segment,
2100 .gro_receive = tcp6_gro_receive,
2101 .gro_complete = tcp6_gro_complete,
2102 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2103 };
2104
2105 static struct inet_protosw tcpv6_protosw = {
2106 .type = SOCK_STREAM,
2107 .protocol = IPPROTO_TCP,
2108 .prot = &tcpv6_prot,
2109 .ops = &inet6_stream_ops,
2110 .capability = -1,
2111 .no_check = 0,
2112 .flags = INET_PROTOSW_PERMANENT |
2113 INET_PROTOSW_ICSK,
2114 };
2115
2116 static int tcpv6_net_init(struct net *net)
2117 {
2118 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2119 SOCK_RAW, IPPROTO_TCP, net);
2120 }
2121
2122 static void tcpv6_net_exit(struct net *net)
2123 {
2124 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
2125 inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6);
2126 }
2127
2128 static struct pernet_operations tcpv6_net_ops = {
2129 .init = tcpv6_net_init,
2130 .exit = tcpv6_net_exit,
2131 };
2132
2133 int __init tcpv6_init(void)
2134 {
2135 int ret;
2136
2137 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2138 if (ret)
2139 goto out;
2140
2141 /* register inet6 protocol */
2142 ret = inet6_register_protosw(&tcpv6_protosw);
2143 if (ret)
2144 goto out_tcpv6_protocol;
2145
2146 ret = register_pernet_subsys(&tcpv6_net_ops);
2147 if (ret)
2148 goto out_tcpv6_protosw;
2149 out:
2150 return ret;
2151
2152 out_tcpv6_protocol:
2153 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2154 out_tcpv6_protosw:
2155 inet6_unregister_protosw(&tcpv6_protosw);
2156 goto out;
2157 }
2158
2159 void tcpv6_exit(void)
2160 {
2161 unregister_pernet_subsys(&tcpv6_net_ops);
2162 inet6_unregister_protosw(&tcpv6_protosw);
2163 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2164 }
2165
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