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hwmon: (max6650) Add support for alarms
[deliverable/linux.git] / net / ipv6 / tcp_ipv6.c
1 /*
2 * TCP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on:
9 * linux/net/ipv4/tcp.c
10 * linux/net/ipv4/tcp_input.c
11 * linux/net/ipv4/tcp_output.c
12 *
13 * Fixes:
14 * Hideaki YOSHIFUJI : sin6_scope_id support
15 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
16 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
17 * a single port at the same time.
18 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 */
25
26 #include <linux/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 int type, int 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 };
900 #endif
901
902 static struct timewait_sock_ops tcp6_timewait_sock_ops = {
903 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
904 .twsk_unique = tcp_twsk_unique,
905 .twsk_destructor= tcp_twsk_destructor,
906 };
907
908 static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
909 {
910 struct ipv6_pinfo *np = inet6_sk(sk);
911 struct tcphdr *th = tcp_hdr(skb);
912
913 if (skb->ip_summed == CHECKSUM_PARTIAL) {
914 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
915 skb->csum_start = skb_transport_header(skb) - skb->head;
916 skb->csum_offset = offsetof(struct tcphdr, check);
917 } else {
918 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
919 csum_partial(th, th->doff<<2,
920 skb->csum));
921 }
922 }
923
924 static int tcp_v6_gso_send_check(struct sk_buff *skb)
925 {
926 struct ipv6hdr *ipv6h;
927 struct tcphdr *th;
928
929 if (!pskb_may_pull(skb, sizeof(*th)))
930 return -EINVAL;
931
932 ipv6h = ipv6_hdr(skb);
933 th = tcp_hdr(skb);
934
935 th->check = 0;
936 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
937 IPPROTO_TCP, 0);
938 skb->csum_start = skb_transport_header(skb) - skb->head;
939 skb->csum_offset = offsetof(struct tcphdr, check);
940 skb->ip_summed = CHECKSUM_PARTIAL;
941 return 0;
942 }
943
944 struct sk_buff **tcp6_gro_receive(struct sk_buff **head, struct sk_buff *skb)
945 {
946 struct ipv6hdr *iph = ipv6_hdr(skb);
947
948 switch (skb->ip_summed) {
949 case CHECKSUM_COMPLETE:
950 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
951 skb->csum)) {
952 skb->ip_summed = CHECKSUM_UNNECESSARY;
953 break;
954 }
955
956 /* fall through */
957 case CHECKSUM_NONE:
958 NAPI_GRO_CB(skb)->flush = 1;
959 return NULL;
960 }
961
962 return tcp_gro_receive(head, skb);
963 }
964 EXPORT_SYMBOL(tcp6_gro_receive);
965
966 int tcp6_gro_complete(struct sk_buff *skb)
967 {
968 struct ipv6hdr *iph = ipv6_hdr(skb);
969 struct tcphdr *th = tcp_hdr(skb);
970
971 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
972 &iph->saddr, &iph->daddr, 0);
973 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
974
975 return tcp_gro_complete(skb);
976 }
977 EXPORT_SYMBOL(tcp6_gro_complete);
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->dev);
986 struct sock *ctl_sk = net->ipv6.tcp_sk;
987 unsigned int tot_len = sizeof(struct tcphdr);
988 __be32 *topt;
989
990 if (ts)
991 tot_len += TCPOLEN_TSTAMP_ALIGNED;
992 #ifdef CONFIG_TCP_MD5SIG
993 if (key)
994 tot_len += TCPOLEN_MD5SIG_ALIGNED;
995 #endif
996
997 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
998 GFP_ATOMIC);
999 if (buff == NULL)
1000 return;
1001
1002 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1003
1004 t1 = (struct tcphdr *) skb_push(buff, tot_len);
1005
1006 /* Swap the send and the receive. */
1007 memset(t1, 0, sizeof(*t1));
1008 t1->dest = th->source;
1009 t1->source = th->dest;
1010 t1->doff = tot_len / 4;
1011 t1->seq = htonl(seq);
1012 t1->ack_seq = htonl(ack);
1013 t1->ack = !rst || !th->ack;
1014 t1->rst = rst;
1015 t1->window = htons(win);
1016
1017 topt = (__be32 *)(t1 + 1);
1018
1019 if (ts) {
1020 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1021 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1022 *topt++ = htonl(tcp_time_stamp);
1023 *topt++ = htonl(ts);
1024 }
1025
1026 #ifdef CONFIG_TCP_MD5SIG
1027 if (key) {
1028 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1029 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1030 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
1031 &ipv6_hdr(skb)->saddr,
1032 &ipv6_hdr(skb)->daddr, t1);
1033 }
1034 #endif
1035
1036 buff->csum = csum_partial(t1, tot_len, 0);
1037
1038 memset(&fl, 0, sizeof(fl));
1039 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1040 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1041
1042 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1043 tot_len, IPPROTO_TCP,
1044 buff->csum);
1045
1046 fl.proto = IPPROTO_TCP;
1047 fl.oif = inet6_iif(skb);
1048 fl.fl_ip_dport = t1->dest;
1049 fl.fl_ip_sport = t1->source;
1050 security_skb_classify_flow(skb, &fl);
1051
1052 /* Pass a socket to ip6_dst_lookup either it is for RST
1053 * Underlying function will use this to retrieve the network
1054 * namespace
1055 */
1056 if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
1057 if (xfrm_lookup(net, &buff->dst, &fl, NULL, 0) >= 0) {
1058 ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
1059 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1060 if (rst)
1061 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1062 return;
1063 }
1064 }
1065
1066 kfree_skb(buff);
1067 }
1068
1069 static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1070 {
1071 struct tcphdr *th = tcp_hdr(skb);
1072 u32 seq = 0, ack_seq = 0;
1073 struct tcp_md5sig_key *key = NULL;
1074
1075 if (th->rst)
1076 return;
1077
1078 if (!ipv6_unicast_destination(skb))
1079 return;
1080
1081 #ifdef CONFIG_TCP_MD5SIG
1082 if (sk)
1083 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
1084 #endif
1085
1086 if (th->ack)
1087 seq = ntohl(th->ack_seq);
1088 else
1089 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
1090 (th->doff << 2);
1091
1092 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
1093 }
1094
1095 static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1096 struct tcp_md5sig_key *key)
1097 {
1098 tcp_v6_send_response(skb, seq, ack, win, ts, key, 0);
1099 }
1100
1101 static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1102 {
1103 struct inet_timewait_sock *tw = inet_twsk(sk);
1104 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1105
1106 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
1107 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1108 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
1109
1110 inet_twsk_put(tw);
1111 }
1112
1113 static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
1114 struct request_sock *req)
1115 {
1116 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
1117 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
1118 }
1119
1120
1121 static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1122 {
1123 struct request_sock *req, **prev;
1124 const struct tcphdr *th = tcp_hdr(skb);
1125 struct sock *nsk;
1126
1127 /* Find possible connection requests. */
1128 req = inet6_csk_search_req(sk, &prev, th->source,
1129 &ipv6_hdr(skb)->saddr,
1130 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1131 if (req)
1132 return tcp_check_req(sk, skb, req, prev);
1133
1134 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
1135 &ipv6_hdr(skb)->saddr, th->source,
1136 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1137
1138 if (nsk) {
1139 if (nsk->sk_state != TCP_TIME_WAIT) {
1140 bh_lock_sock(nsk);
1141 return nsk;
1142 }
1143 inet_twsk_put(inet_twsk(nsk));
1144 return NULL;
1145 }
1146
1147 #ifdef CONFIG_SYN_COOKIES
1148 if (!th->rst && !th->syn && th->ack)
1149 sk = cookie_v6_check(sk, skb);
1150 #endif
1151 return sk;
1152 }
1153
1154 /* FIXME: this is substantially similar to the ipv4 code.
1155 * Can some kind of merge be done? -- erics
1156 */
1157 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1158 {
1159 struct inet6_request_sock *treq;
1160 struct ipv6_pinfo *np = inet6_sk(sk);
1161 struct tcp_options_received tmp_opt;
1162 struct tcp_sock *tp = tcp_sk(sk);
1163 struct request_sock *req = NULL;
1164 __u32 isn = TCP_SKB_CB(skb)->when;
1165 #ifdef CONFIG_SYN_COOKIES
1166 int want_cookie = 0;
1167 #else
1168 #define want_cookie 0
1169 #endif
1170
1171 if (skb->protocol == htons(ETH_P_IP))
1172 return tcp_v4_conn_request(sk, skb);
1173
1174 if (!ipv6_unicast_destination(skb))
1175 goto drop;
1176
1177 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1178 if (net_ratelimit())
1179 syn_flood_warning(skb);
1180 #ifdef CONFIG_SYN_COOKIES
1181 if (sysctl_tcp_syncookies)
1182 want_cookie = 1;
1183 else
1184 #endif
1185 goto drop;
1186 }
1187
1188 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1189 goto drop;
1190
1191 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1192 if (req == NULL)
1193 goto drop;
1194
1195 #ifdef CONFIG_TCP_MD5SIG
1196 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1197 #endif
1198
1199 tcp_clear_options(&tmp_opt);
1200 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1201 tmp_opt.user_mss = tp->rx_opt.user_mss;
1202
1203 tcp_parse_options(skb, &tmp_opt, 0);
1204
1205 if (want_cookie && !tmp_opt.saw_tstamp)
1206 tcp_clear_options(&tmp_opt);
1207
1208 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1209 tcp_openreq_init(req, &tmp_opt, skb);
1210
1211 treq = inet6_rsk(req);
1212 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1213 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
1214 if (!want_cookie)
1215 TCP_ECN_create_request(req, tcp_hdr(skb));
1216
1217 if (want_cookie) {
1218 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1219 req->cookie_ts = tmp_opt.tstamp_ok;
1220 } else if (!isn) {
1221 if (ipv6_opt_accepted(sk, skb) ||
1222 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1223 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1224 atomic_inc(&skb->users);
1225 treq->pktopts = skb;
1226 }
1227 treq->iif = sk->sk_bound_dev_if;
1228
1229 /* So that link locals have meaning */
1230 if (!sk->sk_bound_dev_if &&
1231 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1232 treq->iif = inet6_iif(skb);
1233
1234 isn = tcp_v6_init_sequence(skb);
1235 }
1236
1237 tcp_rsk(req)->snt_isn = isn;
1238
1239 security_inet_conn_request(sk, skb, req);
1240
1241 if (tcp_v6_send_synack(sk, req))
1242 goto drop;
1243
1244 if (!want_cookie) {
1245 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1246 return 0;
1247 }
1248
1249 drop:
1250 if (req)
1251 reqsk_free(req);
1252
1253 return 0; /* don't send reset */
1254 }
1255
1256 static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
1257 struct request_sock *req,
1258 struct dst_entry *dst)
1259 {
1260 struct inet6_request_sock *treq;
1261 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1262 struct tcp6_sock *newtcp6sk;
1263 struct inet_sock *newinet;
1264 struct tcp_sock *newtp;
1265 struct sock *newsk;
1266 struct ipv6_txoptions *opt;
1267 #ifdef CONFIG_TCP_MD5SIG
1268 struct tcp_md5sig_key *key;
1269 #endif
1270
1271 if (skb->protocol == htons(ETH_P_IP)) {
1272 /*
1273 * v6 mapped
1274 */
1275
1276 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1277
1278 if (newsk == NULL)
1279 return NULL;
1280
1281 newtcp6sk = (struct tcp6_sock *)newsk;
1282 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1283
1284 newinet = inet_sk(newsk);
1285 newnp = inet6_sk(newsk);
1286 newtp = tcp_sk(newsk);
1287
1288 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1289
1290 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1291 newinet->daddr);
1292
1293 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1294 newinet->saddr);
1295
1296 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1297
1298 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1299 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
1300 #ifdef CONFIG_TCP_MD5SIG
1301 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1302 #endif
1303
1304 newnp->pktoptions = NULL;
1305 newnp->opt = NULL;
1306 newnp->mcast_oif = inet6_iif(skb);
1307 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1308
1309 /*
1310 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1311 * here, tcp_create_openreq_child now does this for us, see the comment in
1312 * that function for the gory details. -acme
1313 */
1314
1315 /* It is tricky place. Until this moment IPv4 tcp
1316 worked with IPv6 icsk.icsk_af_ops.
1317 Sync it now.
1318 */
1319 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1320
1321 return newsk;
1322 }
1323
1324 treq = inet6_rsk(req);
1325 opt = np->opt;
1326
1327 if (sk_acceptq_is_full(sk))
1328 goto out_overflow;
1329
1330 if (dst == NULL) {
1331 struct in6_addr *final_p = NULL, final;
1332 struct flowi fl;
1333
1334 memset(&fl, 0, sizeof(fl));
1335 fl.proto = IPPROTO_TCP;
1336 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1337 if (opt && opt->srcrt) {
1338 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1339 ipv6_addr_copy(&final, &fl.fl6_dst);
1340 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1341 final_p = &final;
1342 }
1343 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1344 fl.oif = sk->sk_bound_dev_if;
1345 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1346 fl.fl_ip_sport = inet_rsk(req)->loc_port;
1347 security_req_classify_flow(req, &fl);
1348
1349 if (ip6_dst_lookup(sk, &dst, &fl))
1350 goto out;
1351
1352 if (final_p)
1353 ipv6_addr_copy(&fl.fl6_dst, final_p);
1354
1355 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
1356 goto out;
1357 }
1358
1359 newsk = tcp_create_openreq_child(sk, req, skb);
1360 if (newsk == NULL)
1361 goto out;
1362
1363 /*
1364 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1365 * count here, tcp_create_openreq_child now does this for us, see the
1366 * comment in that function for the gory details. -acme
1367 */
1368
1369 newsk->sk_gso_type = SKB_GSO_TCPV6;
1370 __ip6_dst_store(newsk, dst, NULL, NULL);
1371
1372 newtcp6sk = (struct tcp6_sock *)newsk;
1373 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1374
1375 newtp = tcp_sk(newsk);
1376 newinet = inet_sk(newsk);
1377 newnp = inet6_sk(newsk);
1378
1379 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1380
1381 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1382 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1383 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1384 newsk->sk_bound_dev_if = treq->iif;
1385
1386 /* Now IPv6 options...
1387
1388 First: no IPv4 options.
1389 */
1390 newinet->opt = NULL;
1391 newnp->ipv6_fl_list = NULL;
1392
1393 /* Clone RX bits */
1394 newnp->rxopt.all = np->rxopt.all;
1395
1396 /* Clone pktoptions received with SYN */
1397 newnp->pktoptions = NULL;
1398 if (treq->pktopts != NULL) {
1399 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1400 kfree_skb(treq->pktopts);
1401 treq->pktopts = NULL;
1402 if (newnp->pktoptions)
1403 skb_set_owner_r(newnp->pktoptions, newsk);
1404 }
1405 newnp->opt = NULL;
1406 newnp->mcast_oif = inet6_iif(skb);
1407 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1408
1409 /* Clone native IPv6 options from listening socket (if any)
1410
1411 Yes, keeping reference count would be much more clever,
1412 but we make one more one thing there: reattach optmem
1413 to newsk.
1414 */
1415 if (opt) {
1416 newnp->opt = ipv6_dup_options(newsk, opt);
1417 if (opt != np->opt)
1418 sock_kfree_s(sk, opt, opt->tot_len);
1419 }
1420
1421 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1422 if (newnp->opt)
1423 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1424 newnp->opt->opt_flen);
1425
1426 tcp_mtup_init(newsk);
1427 tcp_sync_mss(newsk, dst_mtu(dst));
1428 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1429 tcp_initialize_rcv_mss(newsk);
1430
1431 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1432
1433 #ifdef CONFIG_TCP_MD5SIG
1434 /* Copy over the MD5 key from the original socket */
1435 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1436 /* We're using one, so create a matching key
1437 * on the newsk structure. If we fail to get
1438 * memory, then we end up not copying the key
1439 * across. Shucks.
1440 */
1441 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1442 if (newkey != NULL)
1443 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1444 newkey, key->keylen);
1445 }
1446 #endif
1447
1448 __inet6_hash(newsk);
1449 __inet_inherit_port(sk, newsk);
1450
1451 return newsk;
1452
1453 out_overflow:
1454 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
1455 out:
1456 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1457 if (opt && opt != np->opt)
1458 sock_kfree_s(sk, opt, opt->tot_len);
1459 dst_release(dst);
1460 return NULL;
1461 }
1462
1463 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1464 {
1465 if (skb->ip_summed == CHECKSUM_COMPLETE) {
1466 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
1467 &ipv6_hdr(skb)->daddr, skb->csum)) {
1468 skb->ip_summed = CHECKSUM_UNNECESSARY;
1469 return 0;
1470 }
1471 }
1472
1473 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
1474 &ipv6_hdr(skb)->saddr,
1475 &ipv6_hdr(skb)->daddr, 0));
1476
1477 if (skb->len <= 76) {
1478 return __skb_checksum_complete(skb);
1479 }
1480 return 0;
1481 }
1482
1483 /* The socket must have it's spinlock held when we get
1484 * here.
1485 *
1486 * We have a potential double-lock case here, so even when
1487 * doing backlog processing we use the BH locking scheme.
1488 * This is because we cannot sleep with the original spinlock
1489 * held.
1490 */
1491 static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1492 {
1493 struct ipv6_pinfo *np = inet6_sk(sk);
1494 struct tcp_sock *tp;
1495 struct sk_buff *opt_skb = NULL;
1496
1497 /* Imagine: socket is IPv6. IPv4 packet arrives,
1498 goes to IPv4 receive handler and backlogged.
1499 From backlog it always goes here. Kerboom...
1500 Fortunately, tcp_rcv_established and rcv_established
1501 handle them correctly, but it is not case with
1502 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1503 */
1504
1505 if (skb->protocol == htons(ETH_P_IP))
1506 return tcp_v4_do_rcv(sk, skb);
1507
1508 #ifdef CONFIG_TCP_MD5SIG
1509 if (tcp_v6_inbound_md5_hash (sk, skb))
1510 goto discard;
1511 #endif
1512
1513 if (sk_filter(sk, skb))
1514 goto discard;
1515
1516 /*
1517 * socket locking is here for SMP purposes as backlog rcv
1518 * is currently called with bh processing disabled.
1519 */
1520
1521 /* Do Stevens' IPV6_PKTOPTIONS.
1522
1523 Yes, guys, it is the only place in our code, where we
1524 may make it not affecting IPv4.
1525 The rest of code is protocol independent,
1526 and I do not like idea to uglify IPv4.
1527
1528 Actually, all the idea behind IPV6_PKTOPTIONS
1529 looks not very well thought. For now we latch
1530 options, received in the last packet, enqueued
1531 by tcp. Feel free to propose better solution.
1532 --ANK (980728)
1533 */
1534 if (np->rxopt.all)
1535 opt_skb = skb_clone(skb, GFP_ATOMIC);
1536
1537 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1538 TCP_CHECK_TIMER(sk);
1539 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1540 goto reset;
1541 TCP_CHECK_TIMER(sk);
1542 if (opt_skb)
1543 goto ipv6_pktoptions;
1544 return 0;
1545 }
1546
1547 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1548 goto csum_err;
1549
1550 if (sk->sk_state == TCP_LISTEN) {
1551 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1552 if (!nsk)
1553 goto discard;
1554
1555 /*
1556 * Queue it on the new socket if the new socket is active,
1557 * otherwise we just shortcircuit this and continue with
1558 * the new socket..
1559 */
1560 if(nsk != sk) {
1561 if (tcp_child_process(sk, nsk, skb))
1562 goto reset;
1563 if (opt_skb)
1564 __kfree_skb(opt_skb);
1565 return 0;
1566 }
1567 }
1568
1569 TCP_CHECK_TIMER(sk);
1570 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1571 goto reset;
1572 TCP_CHECK_TIMER(sk);
1573 if (opt_skb)
1574 goto ipv6_pktoptions;
1575 return 0;
1576
1577 reset:
1578 tcp_v6_send_reset(sk, skb);
1579 discard:
1580 if (opt_skb)
1581 __kfree_skb(opt_skb);
1582 kfree_skb(skb);
1583 return 0;
1584 csum_err:
1585 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1586 goto discard;
1587
1588
1589 ipv6_pktoptions:
1590 /* Do you ask, what is it?
1591
1592 1. skb was enqueued by tcp.
1593 2. skb is added to tail of read queue, rather than out of order.
1594 3. socket is not in passive state.
1595 4. Finally, it really contains options, which user wants to receive.
1596 */
1597 tp = tcp_sk(sk);
1598 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1599 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
1600 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
1601 np->mcast_oif = inet6_iif(opt_skb);
1602 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
1603 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1604 if (ipv6_opt_accepted(sk, opt_skb)) {
1605 skb_set_owner_r(opt_skb, sk);
1606 opt_skb = xchg(&np->pktoptions, opt_skb);
1607 } else {
1608 __kfree_skb(opt_skb);
1609 opt_skb = xchg(&np->pktoptions, NULL);
1610 }
1611 }
1612
1613 kfree_skb(opt_skb);
1614 return 0;
1615 }
1616
1617 static int tcp_v6_rcv(struct sk_buff *skb)
1618 {
1619 struct tcphdr *th;
1620 struct sock *sk;
1621 int ret;
1622 struct net *net = dev_net(skb->dev);
1623
1624 if (skb->pkt_type != PACKET_HOST)
1625 goto discard_it;
1626
1627 /*
1628 * Count it even if it's bad.
1629 */
1630 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1631
1632 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1633 goto discard_it;
1634
1635 th = tcp_hdr(skb);
1636
1637 if (th->doff < sizeof(struct tcphdr)/4)
1638 goto bad_packet;
1639 if (!pskb_may_pull(skb, th->doff*4))
1640 goto discard_it;
1641
1642 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1643 goto bad_packet;
1644
1645 th = tcp_hdr(skb);
1646 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1647 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1648 skb->len - th->doff*4);
1649 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1650 TCP_SKB_CB(skb)->when = 0;
1651 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1652 TCP_SKB_CB(skb)->sacked = 0;
1653
1654 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1655 if (!sk)
1656 goto no_tcp_socket;
1657
1658 process:
1659 if (sk->sk_state == TCP_TIME_WAIT)
1660 goto do_time_wait;
1661
1662 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1663 goto discard_and_relse;
1664
1665 if (sk_filter(sk, skb))
1666 goto discard_and_relse;
1667
1668 skb->dev = NULL;
1669
1670 bh_lock_sock_nested(sk);
1671 ret = 0;
1672 if (!sock_owned_by_user(sk)) {
1673 #ifdef CONFIG_NET_DMA
1674 struct tcp_sock *tp = tcp_sk(sk);
1675 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
1676 tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1677 if (tp->ucopy.dma_chan)
1678 ret = tcp_v6_do_rcv(sk, skb);
1679 else
1680 #endif
1681 {
1682 if (!tcp_prequeue(sk, skb))
1683 ret = tcp_v6_do_rcv(sk, skb);
1684 }
1685 } else
1686 sk_add_backlog(sk, skb);
1687 bh_unlock_sock(sk);
1688
1689 sock_put(sk);
1690 return ret ? -1 : 0;
1691
1692 no_tcp_socket:
1693 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1694 goto discard_it;
1695
1696 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1697 bad_packet:
1698 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1699 } else {
1700 tcp_v6_send_reset(NULL, skb);
1701 }
1702
1703 discard_it:
1704
1705 /*
1706 * Discard frame
1707 */
1708
1709 kfree_skb(skb);
1710 return 0;
1711
1712 discard_and_relse:
1713 sock_put(sk);
1714 goto discard_it;
1715
1716 do_time_wait:
1717 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
1718 inet_twsk_put(inet_twsk(sk));
1719 goto discard_it;
1720 }
1721
1722 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1723 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1724 inet_twsk_put(inet_twsk(sk));
1725 goto discard_it;
1726 }
1727
1728 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1729 case TCP_TW_SYN:
1730 {
1731 struct sock *sk2;
1732
1733 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
1734 &ipv6_hdr(skb)->daddr,
1735 ntohs(th->dest), inet6_iif(skb));
1736 if (sk2 != NULL) {
1737 struct inet_timewait_sock *tw = inet_twsk(sk);
1738 inet_twsk_deschedule(tw, &tcp_death_row);
1739 inet_twsk_put(tw);
1740 sk = sk2;
1741 goto process;
1742 }
1743 /* Fall through to ACK */
1744 }
1745 case TCP_TW_ACK:
1746 tcp_v6_timewait_ack(sk, skb);
1747 break;
1748 case TCP_TW_RST:
1749 goto no_tcp_socket;
1750 case TCP_TW_SUCCESS:;
1751 }
1752 goto discard_it;
1753 }
1754
1755 static int tcp_v6_remember_stamp(struct sock *sk)
1756 {
1757 /* Alas, not yet... */
1758 return 0;
1759 }
1760
1761 static struct inet_connection_sock_af_ops ipv6_specific = {
1762 .queue_xmit = inet6_csk_xmit,
1763 .send_check = tcp_v6_send_check,
1764 .rebuild_header = inet6_sk_rebuild_header,
1765 .conn_request = tcp_v6_conn_request,
1766 .syn_recv_sock = tcp_v6_syn_recv_sock,
1767 .remember_stamp = tcp_v6_remember_stamp,
1768 .net_header_len = sizeof(struct ipv6hdr),
1769 .setsockopt = ipv6_setsockopt,
1770 .getsockopt = ipv6_getsockopt,
1771 .addr2sockaddr = inet6_csk_addr2sockaddr,
1772 .sockaddr_len = sizeof(struct sockaddr_in6),
1773 .bind_conflict = inet6_csk_bind_conflict,
1774 #ifdef CONFIG_COMPAT
1775 .compat_setsockopt = compat_ipv6_setsockopt,
1776 .compat_getsockopt = compat_ipv6_getsockopt,
1777 #endif
1778 };
1779
1780 #ifdef CONFIG_TCP_MD5SIG
1781 static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
1782 .md5_lookup = tcp_v6_md5_lookup,
1783 .calc_md5_hash = tcp_v6_md5_hash_skb,
1784 .md5_add = tcp_v6_md5_add_func,
1785 .md5_parse = tcp_v6_parse_md5_keys,
1786 };
1787 #endif
1788
1789 /*
1790 * TCP over IPv4 via INET6 API
1791 */
1792
1793 static struct inet_connection_sock_af_ops ipv6_mapped = {
1794 .queue_xmit = ip_queue_xmit,
1795 .send_check = tcp_v4_send_check,
1796 .rebuild_header = inet_sk_rebuild_header,
1797 .conn_request = tcp_v6_conn_request,
1798 .syn_recv_sock = tcp_v6_syn_recv_sock,
1799 .remember_stamp = tcp_v4_remember_stamp,
1800 .net_header_len = sizeof(struct iphdr),
1801 .setsockopt = ipv6_setsockopt,
1802 .getsockopt = ipv6_getsockopt,
1803 .addr2sockaddr = inet6_csk_addr2sockaddr,
1804 .sockaddr_len = sizeof(struct sockaddr_in6),
1805 .bind_conflict = inet6_csk_bind_conflict,
1806 #ifdef CONFIG_COMPAT
1807 .compat_setsockopt = compat_ipv6_setsockopt,
1808 .compat_getsockopt = compat_ipv6_getsockopt,
1809 #endif
1810 };
1811
1812 #ifdef CONFIG_TCP_MD5SIG
1813 static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
1814 .md5_lookup = tcp_v4_md5_lookup,
1815 .calc_md5_hash = tcp_v4_md5_hash_skb,
1816 .md5_add = tcp_v6_md5_add_func,
1817 .md5_parse = tcp_v6_parse_md5_keys,
1818 };
1819 #endif
1820
1821 /* NOTE: A lot of things set to zero explicitly by call to
1822 * sk_alloc() so need not be done here.
1823 */
1824 static int tcp_v6_init_sock(struct sock *sk)
1825 {
1826 struct inet_connection_sock *icsk = inet_csk(sk);
1827 struct tcp_sock *tp = tcp_sk(sk);
1828
1829 skb_queue_head_init(&tp->out_of_order_queue);
1830 tcp_init_xmit_timers(sk);
1831 tcp_prequeue_init(tp);
1832
1833 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1834 tp->mdev = TCP_TIMEOUT_INIT;
1835
1836 /* So many TCP implementations out there (incorrectly) count the
1837 * initial SYN frame in their delayed-ACK and congestion control
1838 * algorithms that we must have the following bandaid to talk
1839 * efficiently to them. -DaveM
1840 */
1841 tp->snd_cwnd = 2;
1842
1843 /* See draft-stevens-tcpca-spec-01 for discussion of the
1844 * initialization of these values.
1845 */
1846 tp->snd_ssthresh = 0x7fffffff;
1847 tp->snd_cwnd_clamp = ~0;
1848 tp->mss_cache = 536;
1849
1850 tp->reordering = sysctl_tcp_reordering;
1851
1852 sk->sk_state = TCP_CLOSE;
1853
1854 icsk->icsk_af_ops = &ipv6_specific;
1855 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
1856 icsk->icsk_sync_mss = tcp_sync_mss;
1857 sk->sk_write_space = sk_stream_write_space;
1858 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1859
1860 #ifdef CONFIG_TCP_MD5SIG
1861 tp->af_specific = &tcp_sock_ipv6_specific;
1862 #endif
1863
1864 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1865 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1866
1867 local_bh_disable();
1868 percpu_counter_inc(&tcp_sockets_allocated);
1869 local_bh_enable();
1870
1871 return 0;
1872 }
1873
1874 static void tcp_v6_destroy_sock(struct sock *sk)
1875 {
1876 #ifdef CONFIG_TCP_MD5SIG
1877 /* Clean up the MD5 key list */
1878 if (tcp_sk(sk)->md5sig_info)
1879 tcp_v6_clear_md5_list(sk);
1880 #endif
1881 tcp_v4_destroy_sock(sk);
1882 inet6_destroy_sock(sk);
1883 }
1884
1885 #ifdef CONFIG_PROC_FS
1886 /* Proc filesystem TCPv6 sock list dumping. */
1887 static void get_openreq6(struct seq_file *seq,
1888 struct sock *sk, struct request_sock *req, int i, int uid)
1889 {
1890 int ttd = req->expires - jiffies;
1891 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1892 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1893
1894 if (ttd < 0)
1895 ttd = 0;
1896
1897 seq_printf(seq,
1898 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1899 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1900 i,
1901 src->s6_addr32[0], src->s6_addr32[1],
1902 src->s6_addr32[2], src->s6_addr32[3],
1903 ntohs(inet_rsk(req)->loc_port),
1904 dest->s6_addr32[0], dest->s6_addr32[1],
1905 dest->s6_addr32[2], dest->s6_addr32[3],
1906 ntohs(inet_rsk(req)->rmt_port),
1907 TCP_SYN_RECV,
1908 0,0, /* could print option size, but that is af dependent. */
1909 1, /* timers active (only the expire timer) */
1910 jiffies_to_clock_t(ttd),
1911 req->retrans,
1912 uid,
1913 0, /* non standard timer */
1914 0, /* open_requests have no inode */
1915 0, req);
1916 }
1917
1918 static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1919 {
1920 struct in6_addr *dest, *src;
1921 __u16 destp, srcp;
1922 int timer_active;
1923 unsigned long timer_expires;
1924 struct inet_sock *inet = inet_sk(sp);
1925 struct tcp_sock *tp = tcp_sk(sp);
1926 const struct inet_connection_sock *icsk = inet_csk(sp);
1927 struct ipv6_pinfo *np = inet6_sk(sp);
1928
1929 dest = &np->daddr;
1930 src = &np->rcv_saddr;
1931 destp = ntohs(inet->dport);
1932 srcp = ntohs(inet->sport);
1933
1934 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1935 timer_active = 1;
1936 timer_expires = icsk->icsk_timeout;
1937 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1938 timer_active = 4;
1939 timer_expires = icsk->icsk_timeout;
1940 } else if (timer_pending(&sp->sk_timer)) {
1941 timer_active = 2;
1942 timer_expires = sp->sk_timer.expires;
1943 } else {
1944 timer_active = 0;
1945 timer_expires = jiffies;
1946 }
1947
1948 seq_printf(seq,
1949 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1950 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %lu %lu %u %u %d\n",
1951 i,
1952 src->s6_addr32[0], src->s6_addr32[1],
1953 src->s6_addr32[2], src->s6_addr32[3], srcp,
1954 dest->s6_addr32[0], dest->s6_addr32[1],
1955 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1956 sp->sk_state,
1957 tp->write_seq-tp->snd_una,
1958 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1959 timer_active,
1960 jiffies_to_clock_t(timer_expires - jiffies),
1961 icsk->icsk_retransmits,
1962 sock_i_uid(sp),
1963 icsk->icsk_probes_out,
1964 sock_i_ino(sp),
1965 atomic_read(&sp->sk_refcnt), sp,
1966 jiffies_to_clock_t(icsk->icsk_rto),
1967 jiffies_to_clock_t(icsk->icsk_ack.ato),
1968 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
1969 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
1970 );
1971 }
1972
1973 static void get_timewait6_sock(struct seq_file *seq,
1974 struct inet_timewait_sock *tw, int i)
1975 {
1976 struct in6_addr *dest, *src;
1977 __u16 destp, srcp;
1978 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1979 int ttd = tw->tw_ttd - jiffies;
1980
1981 if (ttd < 0)
1982 ttd = 0;
1983
1984 dest = &tw6->tw_v6_daddr;
1985 src = &tw6->tw_v6_rcv_saddr;
1986 destp = ntohs(tw->tw_dport);
1987 srcp = ntohs(tw->tw_sport);
1988
1989 seq_printf(seq,
1990 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1991 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1992 i,
1993 src->s6_addr32[0], src->s6_addr32[1],
1994 src->s6_addr32[2], src->s6_addr32[3], srcp,
1995 dest->s6_addr32[0], dest->s6_addr32[1],
1996 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1997 tw->tw_substate, 0, 0,
1998 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
1999 atomic_read(&tw->tw_refcnt), tw);
2000 }
2001
2002 static int tcp6_seq_show(struct seq_file *seq, void *v)
2003 {
2004 struct tcp_iter_state *st;
2005
2006 if (v == SEQ_START_TOKEN) {
2007 seq_puts(seq,
2008 " sl "
2009 "local_address "
2010 "remote_address "
2011 "st tx_queue rx_queue tr tm->when retrnsmt"
2012 " uid timeout inode\n");
2013 goto out;
2014 }
2015 st = seq->private;
2016
2017 switch (st->state) {
2018 case TCP_SEQ_STATE_LISTENING:
2019 case TCP_SEQ_STATE_ESTABLISHED:
2020 get_tcp6_sock(seq, v, st->num);
2021 break;
2022 case TCP_SEQ_STATE_OPENREQ:
2023 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2024 break;
2025 case TCP_SEQ_STATE_TIME_WAIT:
2026 get_timewait6_sock(seq, v, st->num);
2027 break;
2028 }
2029 out:
2030 return 0;
2031 }
2032
2033 static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2034 .name = "tcp6",
2035 .family = AF_INET6,
2036 .seq_fops = {
2037 .owner = THIS_MODULE,
2038 },
2039 .seq_ops = {
2040 .show = tcp6_seq_show,
2041 },
2042 };
2043
2044 int tcp6_proc_init(struct net *net)
2045 {
2046 return tcp_proc_register(net, &tcp6_seq_afinfo);
2047 }
2048
2049 void tcp6_proc_exit(struct net *net)
2050 {
2051 tcp_proc_unregister(net, &tcp6_seq_afinfo);
2052 }
2053 #endif
2054
2055 struct proto tcpv6_prot = {
2056 .name = "TCPv6",
2057 .owner = THIS_MODULE,
2058 .close = tcp_close,
2059 .connect = tcp_v6_connect,
2060 .disconnect = tcp_disconnect,
2061 .accept = inet_csk_accept,
2062 .ioctl = tcp_ioctl,
2063 .init = tcp_v6_init_sock,
2064 .destroy = tcp_v6_destroy_sock,
2065 .shutdown = tcp_shutdown,
2066 .setsockopt = tcp_setsockopt,
2067 .getsockopt = tcp_getsockopt,
2068 .recvmsg = tcp_recvmsg,
2069 .backlog_rcv = tcp_v6_do_rcv,
2070 .hash = tcp_v6_hash,
2071 .unhash = inet_unhash,
2072 .get_port = inet_csk_get_port,
2073 .enter_memory_pressure = tcp_enter_memory_pressure,
2074 .sockets_allocated = &tcp_sockets_allocated,
2075 .memory_allocated = &tcp_memory_allocated,
2076 .memory_pressure = &tcp_memory_pressure,
2077 .orphan_count = &tcp_orphan_count,
2078 .sysctl_mem = sysctl_tcp_mem,
2079 .sysctl_wmem = sysctl_tcp_wmem,
2080 .sysctl_rmem = sysctl_tcp_rmem,
2081 .max_header = MAX_TCP_HEADER,
2082 .obj_size = sizeof(struct tcp6_sock),
2083 .slab_flags = SLAB_DESTROY_BY_RCU,
2084 .twsk_prot = &tcp6_timewait_sock_ops,
2085 .rsk_prot = &tcp6_request_sock_ops,
2086 .h.hashinfo = &tcp_hashinfo,
2087 #ifdef CONFIG_COMPAT
2088 .compat_setsockopt = compat_tcp_setsockopt,
2089 .compat_getsockopt = compat_tcp_getsockopt,
2090 #endif
2091 };
2092
2093 static struct inet6_protocol tcpv6_protocol = {
2094 .handler = tcp_v6_rcv,
2095 .err_handler = tcp_v6_err,
2096 .gso_send_check = tcp_v6_gso_send_check,
2097 .gso_segment = tcp_tso_segment,
2098 .gro_receive = tcp6_gro_receive,
2099 .gro_complete = tcp6_gro_complete,
2100 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2101 };
2102
2103 static struct inet_protosw tcpv6_protosw = {
2104 .type = SOCK_STREAM,
2105 .protocol = IPPROTO_TCP,
2106 .prot = &tcpv6_prot,
2107 .ops = &inet6_stream_ops,
2108 .capability = -1,
2109 .no_check = 0,
2110 .flags = INET_PROTOSW_PERMANENT |
2111 INET_PROTOSW_ICSK,
2112 };
2113
2114 static int tcpv6_net_init(struct net *net)
2115 {
2116 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2117 SOCK_RAW, IPPROTO_TCP, net);
2118 }
2119
2120 static void tcpv6_net_exit(struct net *net)
2121 {
2122 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
2123 inet_twsk_purge(net, &tcp_hashinfo, &tcp_death_row, AF_INET6);
2124 }
2125
2126 static struct pernet_operations tcpv6_net_ops = {
2127 .init = tcpv6_net_init,
2128 .exit = tcpv6_net_exit,
2129 };
2130
2131 int __init tcpv6_init(void)
2132 {
2133 int ret;
2134
2135 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2136 if (ret)
2137 goto out;
2138
2139 /* register inet6 protocol */
2140 ret = inet6_register_protosw(&tcpv6_protosw);
2141 if (ret)
2142 goto out_tcpv6_protocol;
2143
2144 ret = register_pernet_subsys(&tcpv6_net_ops);
2145 if (ret)
2146 goto out_tcpv6_protosw;
2147 out:
2148 return ret;
2149
2150 out_tcpv6_protocol:
2151 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2152 out_tcpv6_protosw:
2153 inet6_unregister_protosw(&tcpv6_protosw);
2154 goto out;
2155 }
2156
2157 void tcpv6_exit(void)
2158 {
2159 unregister_pernet_subsys(&tcpv6_net_ops);
2160 inet6_unregister_protosw(&tcpv6_protosw);
2161 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2162 }
Linux kernel - Deliverables
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