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[NET]: Treat CHECKSUM_PARTIAL as CHECKSUM_UNNECESSARY
[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / tcp_ipv6.c
CommitLineData
1da177e4
LT		 1/*
2 * TCP over IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 *
8 * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
9 *
1ab1457c 10 * Based on:
1da177e4
LT		 11 * linux/net/ipv4/tcp.c
12 * linux/net/ipv4/tcp_input.c
13 * linux/net/ipv4/tcp_output.c
14 *
15 * Fixes:
16 * Hideaki YOSHIFUJI : sin6_scope_id support
17 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
18 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
19 * a single port at the same time.
20 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file.
21 *
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
26 */
27
28#include <linux/module.h>
1da177e4
LT		 29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/socket.h>
32#include <linux/sockios.h>
33#include <linux/net.h>
34#include <linux/jiffies.h>
35#include <linux/in.h>
36#include <linux/in6.h>
37#include <linux/netdevice.h>
38#include <linux/init.h>
39#include <linux/jhash.h>
40#include <linux/ipsec.h>
41#include <linux/times.h>
42
43#include <linux/ipv6.h>
44#include <linux/icmpv6.h>
45#include <linux/random.h>
46
47#include <net/tcp.h>
48#include <net/ndisc.h>
5324a040 49#include <net/inet6_hashtables.h>
8129765a 50#include <net/inet6_connection_sock.h>
1da177e4
LT		 51#include <net/ipv6.h>
52#include <net/transp_v6.h>
53#include <net/addrconf.h>
54#include <net/ip6_route.h>
55#include <net/ip6_checksum.h>
56#include <net/inet_ecn.h>
57#include <net/protocol.h>
58#include <net/xfrm.h>
59#include <net/addrconf.h>
60#include <net/snmp.h>
61#include <net/dsfield.h>
6d6ee43e 62#include <net/timewait_sock.h>
1da177e4
LT		 63
64#include <asm/uaccess.h>
65
66#include <linux/proc_fs.h>
67#include <linux/seq_file.h>
68
cfb6eeb4
YH		 69#include <linux/crypto.h>
70#include <linux/scatterlist.h>
71
ae0f7d5f
DW		 72/* Socket used for sending RSTs and ACKs */
73static struct socket *tcp6_socket;
74
cfb6eeb4 75static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
60236fdd 76static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req);
1ab1457c 77static void tcp_v6_send_check(struct sock *sk, int len,
1da177e4
LT		 78 struct sk_buff *skb);
79
80static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
1da177e4 81
8292a17a
ACM		 82static struct inet_connection_sock_af_ops ipv6_mapped;
83static struct inet_connection_sock_af_ops ipv6_specific;
a928630a 84#ifdef CONFIG_TCP_MD5SIG
cfb6eeb4
YH		 85static struct tcp_sock_af_ops tcp_sock_ipv6_specific;
86static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
a928630a 87#endif
1da177e4 88
1da177e4
LT		 89static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
90{
971af18b
ACM		 91 return inet_csk_get_port(&tcp_hashinfo, sk, snum,
92 inet6_csk_bind_conflict);
1da177e4
LT		 93}
94
1da177e4
LT		 95static void tcp_v6_hash(struct sock *sk)
96{
97 if (sk->sk_state != TCP_CLOSE) {
8292a17a 98 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
1da177e4
LT		 99 tcp_prot.hash(sk);
100 return;
101 }
102 local_bh_disable();
90b19d31 103 __inet6_hash(&tcp_hashinfo, sk);
1da177e4
LT		 104 local_bh_enable();
105 }
106}
107
868c86bc 108static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
1ab1457c
YH		 109 struct in6_addr *saddr,
110 struct in6_addr *daddr,
868c86bc 111 __wsum base)
1da177e4
LT		 112{
113 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
114}
115
a94f723d 116static __u32 tcp_v6_init_sequence(struct sk_buff *skb)
1da177e4 117{
0660e03f
ACM		 118 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
119 ipv6_hdr(skb)->saddr.s6_addr32,
aa8223c7
ACM		 120 tcp_hdr(skb)->dest,
121 tcp_hdr(skb)->source);
1da177e4
LT		 122}
123
1ab1457c 124static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
1da177e4
LT		 125 int addr_len)
126{
127 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
1ab1457c 128 struct inet_sock *inet = inet_sk(sk);
d83d8461 129 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 130 struct ipv6_pinfo *np = inet6_sk(sk);
131 struct tcp_sock *tp = tcp_sk(sk);
132 struct in6_addr *saddr = NULL, *final_p = NULL, final;
133 struct flowi fl;
134 struct dst_entry *dst;
135 int addr_type;
136 int err;
137
1ab1457c 138 if (addr_len < SIN6_LEN_RFC2133)
1da177e4
LT		 139 return -EINVAL;
140
1ab1457c 141 if (usin->sin6_family != AF_INET6)
1da177e4
LT		 142 return(-EAFNOSUPPORT);
143
144 memset(&fl, 0, sizeof(fl));
145
146 if (np->sndflow) {
147 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
148 IP6_ECN_flow_init(fl.fl6_flowlabel);
149 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
150 struct ip6_flowlabel *flowlabel;
151 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
152 if (flowlabel == NULL)
153 return -EINVAL;
154 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
155 fl6_sock_release(flowlabel);
156 }
157 }
158
159 /*
1ab1457c
YH		 160 * connect() to INADDR_ANY means loopback (BSD'ism).
161 */
162
163 if(ipv6_addr_any(&usin->sin6_addr))
164 usin->sin6_addr.s6_addr[15] = 0x1;
1da177e4
LT		 165
166 addr_type = ipv6_addr_type(&usin->sin6_addr);
167
168 if(addr_type & IPV6_ADDR_MULTICAST)
169 return -ENETUNREACH;
170
171 if (addr_type&IPV6_ADDR_LINKLOCAL) {
172 if (addr_len >= sizeof(struct sockaddr_in6) &&
173 usin->sin6_scope_id) {
174 /* If interface is set while binding, indices
175 * must coincide.
176 */
177 if (sk->sk_bound_dev_if &&
178 sk->sk_bound_dev_if != usin->sin6_scope_id)
179 return -EINVAL;
180
181 sk->sk_bound_dev_if = usin->sin6_scope_id;
182 }
183
184 /* Connect to link-local address requires an interface */
185 if (!sk->sk_bound_dev_if)
186 return -EINVAL;
187 }
188
189 if (tp->rx_opt.ts_recent_stamp &&
190 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
191 tp->rx_opt.ts_recent = 0;
192 tp->rx_opt.ts_recent_stamp = 0;
193 tp->write_seq = 0;
194 }
195
196 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
197 np->flow_label = fl.fl6_flowlabel;
198
199 /*
200 * TCP over IPv4
201 */
202
203 if (addr_type == IPV6_ADDR_MAPPED) {
d83d8461 204 u32 exthdrlen = icsk->icsk_ext_hdr_len;
1da177e4
LT		 205 struct sockaddr_in sin;
206
207 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
208
209 if (__ipv6_only_sock(sk))
210 return -ENETUNREACH;
211
212 sin.sin_family = AF_INET;
213 sin.sin_port = usin->sin6_port;
214 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
215
d83d8461 216 icsk->icsk_af_ops = &ipv6_mapped;
1da177e4 217 sk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 218#ifdef CONFIG_TCP_MD5SIG
219 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
220#endif
1da177e4
LT		 221
222 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
223
224 if (err) {
d83d8461
ACM		 225 icsk->icsk_ext_hdr_len = exthdrlen;
226 icsk->icsk_af_ops = &ipv6_specific;
1da177e4 227 sk->sk_backlog_rcv = tcp_v6_do_rcv;
cfb6eeb4
YH		 228#ifdef CONFIG_TCP_MD5SIG
229 tp->af_specific = &tcp_sock_ipv6_specific;
230#endif
1da177e4
LT		 231 goto failure;
232 } else {
233 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
234 inet->saddr);
235 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
236 inet->rcv_saddr);
237 }
238
239 return err;
240 }
241
242 if (!ipv6_addr_any(&np->rcv_saddr))
243 saddr = &np->rcv_saddr;
244
245 fl.proto = IPPROTO_TCP;
246 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
247 ipv6_addr_copy(&fl.fl6_src,
248 (saddr ? saddr : &np->saddr));
249 fl.oif = sk->sk_bound_dev_if;
250 fl.fl_ip_dport = usin->sin6_port;
251 fl.fl_ip_sport = inet->sport;
252
253 if (np->opt && np->opt->srcrt) {
254 struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
255 ipv6_addr_copy(&final, &fl.fl6_dst);
256 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
257 final_p = &final;
258 }
259
beb8d13b
VY		 260 security_sk_classify_flow(sk, &fl);
261
1da177e4
LT		 262 err = ip6_dst_lookup(sk, &dst, &fl);
263 if (err)
264 goto failure;
265 if (final_p)
266 ipv6_addr_copy(&fl.fl6_dst, final_p);
267
8eb9086f 268 if ((err = xfrm_lookup(&dst, &fl, sk, 1)) < 0)
1da177e4 269 goto failure;
1da177e4
LT		 270
271 if (saddr == NULL) {
272 saddr = &fl.fl6_src;
273 ipv6_addr_copy(&np->rcv_saddr, saddr);
274 }
275
276 /* set the source address */
277 ipv6_addr_copy(&np->saddr, saddr);
278 inet->rcv_saddr = LOOPBACK4_IPV6;
279
f83ef8c0 280 sk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 281 __ip6_dst_store(sk, dst, NULL, NULL);
1da177e4 282
d83d8461 283 icsk->icsk_ext_hdr_len = 0;
1da177e4 284 if (np->opt)
d83d8461
ACM		 285 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
286 np->opt->opt_nflen);
1da177e4
LT		 287
288 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
289
290 inet->dport = usin->sin6_port;
291
292 tcp_set_state(sk, TCP_SYN_SENT);
d8313f5c 293 err = inet6_hash_connect(&tcp_death_row, sk);
1da177e4
LT		 294 if (err)
295 goto late_failure;
296
297 if (!tp->write_seq)
298 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
299 np->daddr.s6_addr32,
300 inet->sport,
301 inet->dport);
302
303 err = tcp_connect(sk);
304 if (err)
305 goto late_failure;
306
307 return 0;
308
309late_failure:
310 tcp_set_state(sk, TCP_CLOSE);
311 __sk_dst_reset(sk);
312failure:
313 inet->dport = 0;
314 sk->sk_route_caps = 0;
315 return err;
316}
317
318static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
04ce6909 319 int type, int code, int offset, __be32 info)
1da177e4
LT		 320{
321 struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
505cbfc5 322 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
1da177e4
LT		 323 struct ipv6_pinfo *np;
324 struct sock *sk;
325 int err;
1ab1457c 326 struct tcp_sock *tp;
1da177e4
LT		 327 __u32 seq;
328
505cbfc5
ACM		 329 sk = inet6_lookup(&tcp_hashinfo, &hdr->daddr, th->dest, &hdr->saddr,
330 th->source, skb->dev->ifindex);
1da177e4
LT		 331
332 if (sk == NULL) {
333 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
334 return;
335 }
336
337 if (sk->sk_state == TCP_TIME_WAIT) {
9469c7b4 338 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 339 return;
340 }
341
342 bh_lock_sock(sk);
343 if (sock_owned_by_user(sk))
344 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
345
346 if (sk->sk_state == TCP_CLOSE)
347 goto out;
348
349 tp = tcp_sk(sk);
1ab1457c 350 seq = ntohl(th->seq);
1da177e4
LT		 351 if (sk->sk_state != TCP_LISTEN &&
352 !between(seq, tp->snd_una, tp->snd_nxt)) {
353 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
354 goto out;
355 }
356
357 np = inet6_sk(sk);
358
359 if (type == ICMPV6_PKT_TOOBIG) {
360 struct dst_entry *dst = NULL;
361
362 if (sock_owned_by_user(sk))
363 goto out;
364 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
365 goto out;
366
367 /* icmp should have updated the destination cache entry */
368 dst = __sk_dst_check(sk, np->dst_cookie);
369
370 if (dst == NULL) {
371 struct inet_sock *inet = inet_sk(sk);
372 struct flowi fl;
373
374 /* BUGGG_FUTURE: Again, it is not clear how
375 to handle rthdr case. Ignore this complexity
376 for now.
377 */
378 memset(&fl, 0, sizeof(fl));
379 fl.proto = IPPROTO_TCP;
380 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
381 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
382 fl.oif = sk->sk_bound_dev_if;
383 fl.fl_ip_dport = inet->dport;
384 fl.fl_ip_sport = inet->sport;
beb8d13b 385 security_skb_classify_flow(skb, &fl);
1da177e4
LT		 386
387 if ((err = ip6_dst_lookup(sk, &dst, &fl))) {
388 sk->sk_err_soft = -err;
389 goto out;
390 }
391
392 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
393 sk->sk_err_soft = -err;
394 goto out;
395 }
396
397 } else
398 dst_hold(dst);
399
d83d8461 400 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
1da177e4
LT		 401 tcp_sync_mss(sk, dst_mtu(dst));
402 tcp_simple_retransmit(sk);
403 } /* else let the usual retransmit timer handle it */
404 dst_release(dst);
405 goto out;
406 }
407
408 icmpv6_err_convert(type, code, &err);
409
60236fdd 410 /* Might be for an request_sock */
1da177e4 411 switch (sk->sk_state) {
60236fdd 412 struct request_sock *req, **prev;
1da177e4
LT		 413 case TCP_LISTEN:
414 if (sock_owned_by_user(sk))
415 goto out;
416
8129765a
ACM		 417 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
418 &hdr->saddr, inet6_iif(skb));
1da177e4
LT		 419 if (!req)
420 goto out;
421
422 /* ICMPs are not backlogged, hence we cannot get
423 * an established socket here.
424 */
425 BUG_TRAP(req->sk == NULL);
426
2e6599cb 427 if (seq != tcp_rsk(req)->snt_isn) {
1da177e4
LT		 428 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
429 goto out;
430 }
431
463c84b9 432 inet_csk_reqsk_queue_drop(sk, req, prev);
1da177e4
LT		 433 goto out;
434
435 case TCP_SYN_SENT:
436 case TCP_SYN_RECV: /* Cannot happen.
1ab1457c 437 It can, it SYNs are crossed. --ANK */
1da177e4 438 if (!sock_owned_by_user(sk)) {
1da177e4
LT		 439 sk->sk_err = err;
440 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
441
442 tcp_done(sk);
443 } else
444 sk->sk_err_soft = err;
445 goto out;
446 }
447
448 if (!sock_owned_by_user(sk) && np->recverr) {
449 sk->sk_err = err;
450 sk->sk_error_report(sk);
451 } else
452 sk->sk_err_soft = err;
453
454out:
455 bh_unlock_sock(sk);
456 sock_put(sk);
457}
458
459
60236fdd 460static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
1da177e4
LT		 461 struct dst_entry *dst)
462{
ca304b61 463 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 464 struct ipv6_pinfo *np = inet6_sk(sk);
465 struct sk_buff * skb;
466 struct ipv6_txoptions *opt = NULL;
467 struct in6_addr * final_p = NULL, final;
468 struct flowi fl;
469 int err = -1;
470
471 memset(&fl, 0, sizeof(fl));
472 fl.proto = IPPROTO_TCP;
2e6599cb
ACM		 473 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
474 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1da177e4 475 fl.fl6_flowlabel = 0;
2e6599cb
ACM		 476 fl.oif = treq->iif;
477 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1da177e4 478 fl.fl_ip_sport = inet_sk(sk)->sport;
4237c75c 479 security_req_classify_flow(req, &fl);
1da177e4
LT		 480
481 if (dst == NULL) {
482 opt = np->opt;
483 if (opt == NULL &&
333fad53 484 np->rxopt.bits.osrcrt == 2 &&
2e6599cb
ACM		 485 treq->pktopts) {
486 struct sk_buff *pktopts = treq->pktopts;
1da177e4
LT		 487 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
488 if (rxopt->srcrt)
d56f90a7
ACM		 489 opt = ipv6_invert_rthdr(sk,
490 (struct ipv6_rt_hdr *)(skb_network_header(pktopts) +
491 rxopt->srcrt));
1da177e4
LT		 492 }
493
494 if (opt && opt->srcrt) {
495 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
496 ipv6_addr_copy(&final, &fl.fl6_dst);
497 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
498 final_p = &final;
499 }
500
501 err = ip6_dst_lookup(sk, &dst, &fl);
502 if (err)
503 goto done;
504 if (final_p)
505 ipv6_addr_copy(&fl.fl6_dst, final_p);
506 if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
507 goto done;
508 }
509
510 skb = tcp_make_synack(sk, dst, req);
511 if (skb) {
aa8223c7 512 struct tcphdr *th = tcp_hdr(skb);
1da177e4
LT		 513
514 th->check = tcp_v6_check(th, skb->len,
2e6599cb 515 &treq->loc_addr, &treq->rmt_addr,
1da177e4
LT		 516 csum_partial((char *)th, skb->len, skb->csum));
517
2e6599cb 518 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1da177e4 519 err = ip6_xmit(sk, skb, &fl, opt, 0);
b9df3cb8 520 err = net_xmit_eval(err);
1da177e4
LT		 521 }
522
523done:
1ab1457c 524 if (opt && opt != np->opt)
1da177e4 525 sock_kfree_s(sk, opt, opt->tot_len);
78b91042 526 dst_release(dst);
1da177e4
LT		 527 return err;
528}
529
60236fdd 530static void tcp_v6_reqsk_destructor(struct request_sock *req)
1da177e4 531{
ca304b61
ACM		 532 if (inet6_rsk(req)->pktopts)
533 kfree_skb(inet6_rsk(req)->pktopts);
1da177e4
LT		 534}
535
cfb6eeb4
YH		 536#ifdef CONFIG_TCP_MD5SIG
537static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
538 struct in6_addr *addr)
539{
540 struct tcp_sock *tp = tcp_sk(sk);
541 int i;
542
543 BUG_ON(tp == NULL);
544
545 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
546 return NULL;
547
548 for (i = 0; i < tp->md5sig_info->entries6; i++) {
549 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, addr) == 0)
550 return (struct tcp_md5sig_key *)&tp->md5sig_info->keys6[i];
551 }
552 return NULL;
553}
554
555static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
556 struct sock *addr_sk)
557{
558 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
559}
560
561static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
562 struct request_sock *req)
563{
564 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
565}
566
567static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer,
568 char *newkey, u8 newkeylen)
569{
570 /* Add key to the list */
571 struct tcp6_md5sig_key *key;
572 struct tcp_sock *tp = tcp_sk(sk);
573 struct tcp6_md5sig_key *keys;
574
575 key = (struct tcp6_md5sig_key*) tcp_v6_md5_do_lookup(sk, peer);
576 if (key) {
577 /* modify existing entry - just update that one */
578 kfree(key->key);
579 key->key = newkey;
580 key->keylen = newkeylen;
581 } else {
582 /* reallocate new list if current one is full. */
583 if (!tp->md5sig_info) {
584 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
585 if (!tp->md5sig_info) {
586 kfree(newkey);
587 return -ENOMEM;
588 }
589 }
590 tcp_alloc_md5sig_pool();
591 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
592 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
593 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
594
595 if (!keys) {
596 tcp_free_md5sig_pool();
597 kfree(newkey);
598 return -ENOMEM;
599 }
600
601 if (tp->md5sig_info->entries6)
602 memmove(keys, tp->md5sig_info->keys6,
603 (sizeof (tp->md5sig_info->keys6[0]) *
604 tp->md5sig_info->entries6));
605
606 kfree(tp->md5sig_info->keys6);
607 tp->md5sig_info->keys6 = keys;
608 tp->md5sig_info->alloced6++;
609 }
610
611 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
612 peer);
613 tp->md5sig_info->keys6[tp->md5sig_info->entries6].key = newkey;
614 tp->md5sig_info->keys6[tp->md5sig_info->entries6].keylen = newkeylen;
615
616 tp->md5sig_info->entries6++;
617 }
618 return 0;
619}
620
621static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
622 u8 *newkey, __u8 newkeylen)
623{
624 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
625 newkey, newkeylen);
626}
627
628static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer)
629{
630 struct tcp_sock *tp = tcp_sk(sk);
631 int i;
632
633 for (i = 0; i < tp->md5sig_info->entries6; i++) {
634 if (ipv6_addr_cmp(&tp->md5sig_info->keys6[i].addr, peer) == 0) {
635 /* Free the key */
636 kfree(tp->md5sig_info->keys6[i].key);
637 tp->md5sig_info->entries6--;
638
639 if (tp->md5sig_info->entries6 == 0) {
640 kfree(tp->md5sig_info->keys6);
641 tp->md5sig_info->keys6 = NULL;
642
643 tcp_free_md5sig_pool();
644
645 return 0;
646 } else {
647 /* shrink the database */
648 if (tp->md5sig_info->entries6 != i)
649 memmove(&tp->md5sig_info->keys6[i],
650 &tp->md5sig_info->keys6[i+1],
651 (tp->md5sig_info->entries6 - i)
652 * sizeof (tp->md5sig_info->keys6[0]));
653 }
654 }
655 }
656 return -ENOENT;
657}
658
659static void tcp_v6_clear_md5_list (struct sock *sk)
660{
661 struct tcp_sock *tp = tcp_sk(sk);
662 int i;
663
664 if (tp->md5sig_info->entries6) {
665 for (i = 0; i < tp->md5sig_info->entries6; i++)
666 kfree(tp->md5sig_info->keys6[i].key);
667 tp->md5sig_info->entries6 = 0;
668 tcp_free_md5sig_pool();
669 }
670
671 kfree(tp->md5sig_info->keys6);
672 tp->md5sig_info->keys6 = NULL;
673 tp->md5sig_info->alloced6 = 0;
674
675 if (tp->md5sig_info->entries4) {
676 for (i = 0; i < tp->md5sig_info->entries4; i++)
677 kfree(tp->md5sig_info->keys4[i].key);
678 tp->md5sig_info->entries4 = 0;
679 tcp_free_md5sig_pool();
680 }
681
682 kfree(tp->md5sig_info->keys4);
683 tp->md5sig_info->keys4 = NULL;
684 tp->md5sig_info->alloced4 = 0;
685}
686
687static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
688 int optlen)
689{
690 struct tcp_md5sig cmd;
691 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
692 u8 *newkey;
693
694 if (optlen < sizeof(cmd))
695 return -EINVAL;
696
697 if (copy_from_user(&cmd, optval, sizeof(cmd)))
698 return -EFAULT;
699
700 if (sin6->sin6_family != AF_INET6)
701 return -EINVAL;
702
703 if (!cmd.tcpm_keylen) {
704 if (!tcp_sk(sk)->md5sig_info)
705 return -ENOENT;
706 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED)
707 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
708 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
709 }
710
711 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
712 return -EINVAL;
713
714 if (!tcp_sk(sk)->md5sig_info) {
715 struct tcp_sock *tp = tcp_sk(sk);
716 struct tcp_md5sig_info *p;
717
718 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
719 if (!p)
720 return -ENOMEM;
721
722 tp->md5sig_info = p;
723 }
724
af879cc7 725 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
cfb6eeb4
YH		 726 if (!newkey)
727 return -ENOMEM;
cfb6eeb4
YH		 728 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED) {
729 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
730 newkey, cmd.tcpm_keylen);
731 }
732 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
733}
734
735static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
736 struct in6_addr *saddr,
737 struct in6_addr *daddr,
738 struct tcphdr *th, int protocol,
739 int tcplen)
740{
741 struct scatterlist sg[4];
742 __u16 data_len;
743 int block = 0;
8e5200f5 744 __sum16 cksum;
cfb6eeb4
YH		 745 struct tcp_md5sig_pool *hp;
746 struct tcp6_pseudohdr *bp;
747 struct hash_desc *desc;
748 int err;
749 unsigned int nbytes = 0;
750
751 hp = tcp_get_md5sig_pool();
752 if (!hp) {
753 printk(KERN_WARNING "%s(): hash pool not found...\n", __FUNCTION__);
754 goto clear_hash_noput;
755 }
756 bp = &hp->md5_blk.ip6;
757 desc = &hp->md5_desc;
758
759 /* 1. TCP pseudo-header (RFC2460) */
760 ipv6_addr_copy(&bp->saddr, saddr);
761 ipv6_addr_copy(&bp->daddr, daddr);
762 bp->len = htonl(tcplen);
763 bp->protocol = htonl(protocol);
764
765 sg_set_buf(&sg[block++], bp, sizeof(*bp));
766 nbytes += sizeof(*bp);
767
768 /* 2. TCP header, excluding options */
769 cksum = th->check;
770 th->check = 0;
771 sg_set_buf(&sg[block++], th, sizeof(*th));
772 nbytes += sizeof(*th);
773
774 /* 3. TCP segment data (if any) */
775 data_len = tcplen - (th->doff << 2);
776 if (data_len > 0) {
777 u8 *data = (u8 *)th + (th->doff << 2);
778 sg_set_buf(&sg[block++], data, data_len);
779 nbytes += data_len;
780 }
781
782 /* 4. shared key */
783 sg_set_buf(&sg[block++], key->key, key->keylen);
784 nbytes += key->keylen;
785
786 /* Now store the hash into the packet */
787 err = crypto_hash_init(desc);
788 if (err) {
789 printk(KERN_WARNING "%s(): hash_init failed\n", __FUNCTION__);
790 goto clear_hash;
791 }
792 err = crypto_hash_update(desc, sg, nbytes);
793 if (err) {
794 printk(KERN_WARNING "%s(): hash_update failed\n", __FUNCTION__);
795 goto clear_hash;
796 }
797 err = crypto_hash_final(desc, md5_hash);
798 if (err) {
799 printk(KERN_WARNING "%s(): hash_final failed\n", __FUNCTION__);
800 goto clear_hash;
801 }
802
803 /* Reset header, and free up the crypto */
804 tcp_put_md5sig_pool();
805 th->check = cksum;
806out:
807 return 0;
808clear_hash:
809 tcp_put_md5sig_pool();
810clear_hash_noput:
811 memset(md5_hash, 0, 16);
812 goto out;
813}
814
815static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
816 struct sock *sk,
817 struct dst_entry *dst,
818 struct request_sock *req,
819 struct tcphdr *th, int protocol,
820 int tcplen)
821{
822 struct in6_addr *saddr, *daddr;
823
824 if (sk) {
825 saddr = &inet6_sk(sk)->saddr;
826 daddr = &inet6_sk(sk)->daddr;
827 } else {
828 saddr = &inet6_rsk(req)->loc_addr;
829 daddr = &inet6_rsk(req)->rmt_addr;
830 }
831 return tcp_v6_do_calc_md5_hash(md5_hash, key,
832 saddr, daddr,
833 th, protocol, tcplen);
834}
835
836static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
837{
838 __u8 *hash_location = NULL;
839 struct tcp_md5sig_key *hash_expected;
0660e03f 840 struct ipv6hdr *ip6h = ipv6_hdr(skb);
aa8223c7 841 struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4
YH		 842 int length = (th->doff << 2) - sizeof (*th);
843 int genhash;
844 u8 *ptr;
845 u8 newhash[16];
846
847 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
848
849 /* If the TCP option is too short, we can short cut */
850 if (length < TCPOLEN_MD5SIG)
851 return hash_expected ? 1 : 0;
852
853 /* parse options */
854 ptr = (u8*)(th + 1);
855 while (length > 0) {
856 int opcode = *ptr++;
857 int opsize;
858
859 switch(opcode) {
860 case TCPOPT_EOL:
861 goto done_opts;
862 case TCPOPT_NOP:
863 length--;
864 continue;
865 default:
866 opsize = *ptr++;
867 if (opsize < 2 || opsize > length)
868 goto done_opts;
869 if (opcode == TCPOPT_MD5SIG) {
870 hash_location = ptr;
871 goto done_opts;
872 }
873 }
874 ptr += opsize - 2;
875 length -= opsize;
876 }
877
878done_opts:
879 /* do we have a hash as expected? */
880 if (!hash_expected) {
881 if (!hash_location)
882 return 0;
883 if (net_ratelimit()) {
884 printk(KERN_INFO "MD5 Hash NOT expected but found "
885 "(" NIP6_FMT ", %u)->"
886 "(" NIP6_FMT ", %u)\n",
887 NIP6(ip6h->saddr), ntohs(th->source),
888 NIP6(ip6h->daddr), ntohs(th->dest));
889 }
890 return 1;
891 }
892
893 if (!hash_location) {
894 if (net_ratelimit()) {
895 printk(KERN_INFO "MD5 Hash expected but NOT found "
896 "(" NIP6_FMT ", %u)->"
897 "(" NIP6_FMT ", %u)\n",
898 NIP6(ip6h->saddr), ntohs(th->source),
899 NIP6(ip6h->daddr), ntohs(th->dest));
900 }
901 return 1;
902 }
903
904 /* check the signature */
905 genhash = tcp_v6_do_calc_md5_hash(newhash,
906 hash_expected,
907 &ip6h->saddr, &ip6h->daddr,
908 th, sk->sk_protocol,
909 skb->len);
910 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
911 if (net_ratelimit()) {
912 printk(KERN_INFO "MD5 Hash %s for "
913 "(" NIP6_FMT ", %u)->"
914 "(" NIP6_FMT ", %u)\n",
915 genhash ? "failed" : "mismatch",
916 NIP6(ip6h->saddr), ntohs(th->source),
917 NIP6(ip6h->daddr), ntohs(th->dest));
918 }
919 return 1;
920 }
921 return 0;
922}
923#endif
924
9ec75fe8 925static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
1da177e4 926 .family = AF_INET6,
2e6599cb 927 .obj_size = sizeof(struct tcp6_request_sock),
1da177e4 928 .rtx_syn_ack = tcp_v6_send_synack,
60236fdd
ACM		 929 .send_ack = tcp_v6_reqsk_send_ack,
930 .destructor = tcp_v6_reqsk_destructor,
1da177e4
LT		 931 .send_reset = tcp_v6_send_reset
932};
933
cfb6eeb4 934#ifdef CONFIG_TCP_MD5SIG
b6332e6c 935static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
cfb6eeb4 936 .md5_lookup = tcp_v6_reqsk_md5_lookup,
cfb6eeb4 937};
b6332e6c 938#endif
cfb6eeb4 939
6d6ee43e
ACM		 940static struct timewait_sock_ops tcp6_timewait_sock_ops = {
941 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
942 .twsk_unique = tcp_twsk_unique,
cfb6eeb4 943 .twsk_destructor= tcp_twsk_destructor,
6d6ee43e
ACM		 944};
945
8292a17a 946static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
1da177e4
LT		 947{
948 struct ipv6_pinfo *np = inet6_sk(sk);
aa8223c7 949 struct tcphdr *th = tcp_hdr(skb);
1da177e4 950
84fa7933 951 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1da177e4 952 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
663ead3b 953 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 954 skb->csum_offset = offsetof(struct tcphdr, check);
1da177e4 955 } else {
1ab1457c
YH		 956 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,
957 csum_partial((char *)th, th->doff<<2,
1da177e4
LT		 958 skb->csum));
959 }
960}
961
a430a43d
HX		 962static int tcp_v6_gso_send_check(struct sk_buff *skb)
963{
964 struct ipv6hdr *ipv6h;
965 struct tcphdr *th;
966
967 if (!pskb_may_pull(skb, sizeof(*th)))
968 return -EINVAL;
969
0660e03f 970 ipv6h = ipv6_hdr(skb);
aa8223c7 971 th = tcp_hdr(skb);
a430a43d
HX		 972
973 th->check = 0;
974 th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
975 IPPROTO_TCP, 0);
663ead3b 976 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 977 skb->csum_offset = offsetof(struct tcphdr, check);
84fa7933 978 skb->ip_summed = CHECKSUM_PARTIAL;
a430a43d
HX		 979 return 0;
980}
1da177e4 981
cfb6eeb4 982static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1da177e4 983{
aa8223c7 984 struct tcphdr *th = tcp_hdr(skb), *t1;
1da177e4
LT		 985 struct sk_buff *buff;
986 struct flowi fl;
cfb6eeb4
YH		 987 int tot_len = sizeof(*th);
988#ifdef CONFIG_TCP_MD5SIG
989 struct tcp_md5sig_key *key;
990#endif
1da177e4
LT		 991
992 if (th->rst)
993 return;
994
995 if (!ipv6_unicast_destination(skb))
1ab1457c 996 return;
1da177e4 997
cfb6eeb4
YH		 998#ifdef CONFIG_TCP_MD5SIG
999 if (sk)
0660e03f 1000 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
cfb6eeb4
YH		 1001 else
1002 key = NULL;
1003
1004 if (key)
1005 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1006#endif
1007
1da177e4
LT		 1008 /*
1009 * We need to grab some memory, and put together an RST,
1010 * and then put it into the queue to be sent.
1011 */
1012
cfb6eeb4 1013 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1da177e4 1014 GFP_ATOMIC);
1ab1457c
YH		 1015 if (buff == NULL)
1016 return;
1da177e4 1017
cfb6eeb4 1018 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1da177e4 1019
cfb6eeb4 1020 t1 = (struct tcphdr *) skb_push(buff, tot_len);
1da177e4
LT		 1021
1022 /* Swap the send and the receive. */
1023 memset(t1, 0, sizeof(*t1));
1024 t1->dest = th->source;
1025 t1->source = th->dest;
cfb6eeb4 1026 t1->doff = tot_len / 4;
1da177e4 1027 t1->rst = 1;
1ab1457c 1028
1da177e4 1029 if(th->ack) {
1ab1457c 1030 t1->seq = th->ack_seq;
1da177e4
LT		 1031 } else {
1032 t1->ack = 1;
1033 t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
1034 + skb->len - (th->doff<<2));
1035 }
1036
cfb6eeb4
YH		 1037#ifdef CONFIG_TCP_MD5SIG
1038 if (key) {
8e5200f5 1039 __be32 *opt = (__be32*)(t1 + 1);
cfb6eeb4
YH		 1040 opt[0] = htonl((TCPOPT_NOP << 24) |
1041 (TCPOPT_NOP << 16) |
1042 (TCPOPT_MD5SIG << 8) |
1043 TCPOLEN_MD5SIG);
0660e03f
ACM		 1044 tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key,
1045 &ipv6_hdr(skb)->daddr,
1046 &ipv6_hdr(skb)->saddr,
1047 t1, IPPROTO_TCP, tot_len);
cfb6eeb4
YH		 1048 }
1049#endif
1050
1da177e4
LT		 1051 buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
1052
1053 memset(&fl, 0, sizeof(fl));
0660e03f
ACM		 1054 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1055 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1056
1057 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1058 sizeof(*t1), IPPROTO_TCP,
1059 buff->csum);
1060
1061 fl.proto = IPPROTO_TCP;
505cbfc5 1062 fl.oif = inet6_iif(skb);
1da177e4
LT		 1063 fl.fl_ip_dport = t1->dest;
1064 fl.fl_ip_sport = t1->source;
beb8d13b 1065 security_skb_classify_flow(skb, &fl);
1da177e4
LT		 1066
1067 /* sk = NULL, but it is safe for now. RST socket required. */
1068 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
1069
ecc51b6d 1070 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
ae0f7d5f 1071 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
ecc51b6d
ACM		 1072 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1073 TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
1da177e4 1074 return;
ecc51b6d 1075 }
1da177e4
LT		 1076 }
1077
1078 kfree_skb(buff);
1079}
1080
cfb6eeb4
YH		 1081static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
1082 struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
1da177e4 1083{
aa8223c7 1084 struct tcphdr *th = tcp_hdr(skb), *t1;
1da177e4
LT		 1085 struct sk_buff *buff;
1086 struct flowi fl;
1087 int tot_len = sizeof(struct tcphdr);
e69a4adc 1088 __be32 *topt;
cfb6eeb4
YH		 1089#ifdef CONFIG_TCP_MD5SIG
1090 struct tcp_md5sig_key *key;
1091 struct tcp_md5sig_key tw_key;
1092#endif
1093
1094#ifdef CONFIG_TCP_MD5SIG
1095 if (!tw && skb->sk) {
0660e03f 1096 key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr);
cfb6eeb4
YH		 1097 } else if (tw && tw->tw_md5_keylen) {
1098 tw_key.key = tw->tw_md5_key;
1099 tw_key.keylen = tw->tw_md5_keylen;
1100 key = &tw_key;
1101 } else {
1102 key = NULL;
1103 }
1104#endif
1da177e4
LT		 1105
1106 if (ts)
4244f8a9 1107 tot_len += TCPOLEN_TSTAMP_ALIGNED;
cfb6eeb4
YH		 1108#ifdef CONFIG_TCP_MD5SIG
1109 if (key)
1110 tot_len += TCPOLEN_MD5SIG_ALIGNED;
1111#endif
1da177e4
LT		 1112
1113 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1114 GFP_ATOMIC);
1115 if (buff == NULL)
1116 return;
1117
1118 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1119
1120 t1 = (struct tcphdr *) skb_push(buff,tot_len);
1121
1122 /* Swap the send and the receive. */
1123 memset(t1, 0, sizeof(*t1));
1124 t1->dest = th->source;
1125 t1->source = th->dest;
1126 t1->doff = tot_len/4;
1127 t1->seq = htonl(seq);
1128 t1->ack_seq = htonl(ack);
1129 t1->ack = 1;
1130 t1->window = htons(win);
cfb6eeb4 1131
e69a4adc 1132 topt = (__be32 *)(t1 + 1);
1ab1457c 1133
1da177e4 1134 if (ts) {
cfb6eeb4
YH		 1135 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1136 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1137 *topt++ = htonl(tcp_time_stamp);
1138 *topt = htonl(ts);
1da177e4
LT		 1139 }
1140
cfb6eeb4
YH		 1141#ifdef CONFIG_TCP_MD5SIG
1142 if (key) {
1143 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1144 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
0660e03f
ACM		 1145 tcp_v6_do_calc_md5_hash((__u8 *)topt, key,
1146 &ipv6_hdr(skb)->daddr,
1147 &ipv6_hdr(skb)->saddr,
1148 t1, IPPROTO_TCP, tot_len);
cfb6eeb4
YH		 1149 }
1150#endif
1151
1da177e4
LT		 1152 buff->csum = csum_partial((char *)t1, tot_len, 0);
1153
1154 memset(&fl, 0, sizeof(fl));
0660e03f
ACM		 1155 ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr);
1156 ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1157
1158 t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
1159 tot_len, IPPROTO_TCP,
1160 buff->csum);
1161
1162 fl.proto = IPPROTO_TCP;
505cbfc5 1163 fl.oif = inet6_iif(skb);
1da177e4
LT		 1164 fl.fl_ip_dport = t1->dest;
1165 fl.fl_ip_sport = t1->source;
beb8d13b 1166 security_skb_classify_flow(skb, &fl);
1da177e4
LT		 1167
1168 if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
ecc51b6d 1169 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
ae0f7d5f 1170 ip6_xmit(tcp6_socket->sk, buff, &fl, NULL, 0);
ecc51b6d 1171 TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
1da177e4 1172 return;
ecc51b6d 1173 }
1da177e4
LT		 1174 }
1175
1176 kfree_skb(buff);
1177}
1178
1179static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1180{
8feaf0c0 1181 struct inet_timewait_sock *tw = inet_twsk(sk);
cfb6eeb4 1182 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1da177e4 1183
cfb6eeb4 1184 tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
8feaf0c0
ACM		 1185 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
1186 tcptw->tw_ts_recent);
1da177e4 1187
8feaf0c0 1188 inet_twsk_put(tw);
1da177e4
LT		 1189}
1190
60236fdd 1191static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
1da177e4 1192{
cfb6eeb4 1193 tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent);
1da177e4
LT		 1194}
1195
1196
1197static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1198{
60236fdd 1199 struct request_sock *req, **prev;
aa8223c7 1200 const struct tcphdr *th = tcp_hdr(skb);
1da177e4
LT		 1201 struct sock *nsk;
1202
1203 /* Find possible connection requests. */
8129765a 1204 req = inet6_csk_search_req(sk, &prev, th->source,
0660e03f
ACM		 1205 &ipv6_hdr(skb)->saddr,
1206 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1da177e4
LT		 1207 if (req)
1208 return tcp_check_req(sk, skb, req, prev);
1209
0660e03f
ACM		 1210 nsk = __inet6_lookup_established(&tcp_hashinfo, &ipv6_hdr(skb)->saddr,
1211 th->source, &ipv6_hdr(skb)->daddr,
505cbfc5 1212 ntohs(th->dest), inet6_iif(skb));
1da177e4
LT		 1213
1214 if (nsk) {
1215 if (nsk->sk_state != TCP_TIME_WAIT) {
1216 bh_lock_sock(nsk);
1217 return nsk;
1218 }
9469c7b4 1219 inet_twsk_put(inet_twsk(nsk));
1da177e4
LT		 1220 return NULL;
1221 }
1222
1223#if 0 /*def CONFIG_SYN_COOKIES*/
1224 if (!th->rst && !th->syn && th->ack)
1225 sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
1226#endif
1227 return sk;
1228}
1229
1da177e4
LT		 1230/* FIXME: this is substantially similar to the ipv4 code.
1231 * Can some kind of merge be done? -- erics
1232 */
1233static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1234{
ca304b61 1235 struct inet6_request_sock *treq;
1da177e4
LT		 1236 struct ipv6_pinfo *np = inet6_sk(sk);
1237 struct tcp_options_received tmp_opt;
1238 struct tcp_sock *tp = tcp_sk(sk);
60236fdd 1239 struct request_sock *req = NULL;
1da177e4
LT		 1240 __u32 isn = TCP_SKB_CB(skb)->when;
1241
1242 if (skb->protocol == htons(ETH_P_IP))
1243 return tcp_v4_conn_request(sk, skb);
1244
1245 if (!ipv6_unicast_destination(skb))
1ab1457c 1246 goto drop;
1da177e4
LT		 1247
1248 /*
1ab1457c 1249 * There are no SYN attacks on IPv6, yet...
1da177e4 1250 */
463c84b9 1251 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
1da177e4
LT		 1252 if (net_ratelimit())
1253 printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
1ab1457c 1254 goto drop;
1da177e4
LT		 1255 }
1256
463c84b9 1257 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1da177e4
LT		 1258 goto drop;
1259
ca304b61 1260 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1da177e4
LT		 1261 if (req == NULL)
1262 goto drop;
1263
cfb6eeb4
YH		 1264#ifdef CONFIG_TCP_MD5SIG
1265 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1266#endif
1267
1da177e4
LT		 1268 tcp_clear_options(&tmp_opt);
1269 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1270 tmp_opt.user_mss = tp->rx_opt.user_mss;
1271
1272 tcp_parse_options(skb, &tmp_opt, 0);
1273
1274 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1275 tcp_openreq_init(req, &tmp_opt, skb);
1276
ca304b61 1277 treq = inet6_rsk(req);
0660e03f
ACM		 1278 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1279 ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
aa8223c7 1280 TCP_ECN_create_request(req, tcp_hdr(skb));
2e6599cb 1281 treq->pktopts = NULL;
1da177e4 1282 if (ipv6_opt_accepted(sk, skb) ||
333fad53
YH		 1283 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1284 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1da177e4 1285 atomic_inc(&skb->users);
2e6599cb 1286 treq->pktopts = skb;
1da177e4 1287 }
2e6599cb 1288 treq->iif = sk->sk_bound_dev_if;
1da177e4
LT		 1289
1290 /* So that link locals have meaning */
1291 if (!sk->sk_bound_dev_if &&
2e6599cb 1292 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
505cbfc5 1293 treq->iif = inet6_iif(skb);
1da177e4 1294
1ab1457c 1295 if (isn == 0)
a94f723d 1296 isn = tcp_v6_init_sequence(skb);
1da177e4 1297
2e6599cb 1298 tcp_rsk(req)->snt_isn = isn;
1da177e4 1299
4237c75c
VY		 1300 security_inet_conn_request(sk, skb, req);
1301
1da177e4
LT		 1302 if (tcp_v6_send_synack(sk, req, NULL))
1303 goto drop;
1304
8129765a 1305 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1da177e4
LT		 1306 return 0;
1307
1308drop:
1309 if (req)
60236fdd 1310 reqsk_free(req);
1da177e4 1311
1da177e4
LT		 1312 return 0; /* don't send reset */
1313}
1314
1315static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
60236fdd 1316 struct request_sock *req,
1da177e4
LT		 1317 struct dst_entry *dst)
1318{
ca304b61 1319 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 1320 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1321 struct tcp6_sock *newtcp6sk;
1322 struct inet_sock *newinet;
1323 struct tcp_sock *newtp;
1324 struct sock *newsk;
1325 struct ipv6_txoptions *opt;
cfb6eeb4
YH		 1326#ifdef CONFIG_TCP_MD5SIG
1327 struct tcp_md5sig_key *key;
1328#endif
1da177e4
LT		 1329
1330 if (skb->protocol == htons(ETH_P_IP)) {
1331 /*
1332 * v6 mapped
1333 */
1334
1335 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1336
1ab1457c 1337 if (newsk == NULL)
1da177e4
LT		 1338 return NULL;
1339
1340 newtcp6sk = (struct tcp6_sock *)newsk;
1341 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1342
1343 newinet = inet_sk(newsk);
1344 newnp = inet6_sk(newsk);
1345 newtp = tcp_sk(newsk);
1346
1347 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1348
1349 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
1350 newinet->daddr);
1351
1352 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
1353 newinet->saddr);
1354
1355 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1356
8292a17a 1357 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1da177e4 1358 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 1359#ifdef CONFIG_TCP_MD5SIG
1360 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1361#endif
1362
1da177e4
LT		 1363 newnp->pktoptions = NULL;
1364 newnp->opt = NULL;
505cbfc5 1365 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1366 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4 1367
e6848976
ACM		 1368 /*
1369 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1370 * here, tcp_create_openreq_child now does this for us, see the comment in
1371 * that function for the gory details. -acme
1da177e4 1372 */
1da177e4
LT		 1373
1374 /* It is tricky place. Until this moment IPv4 tcp
8292a17a 1375 worked with IPv6 icsk.icsk_af_ops.
1da177e4
LT		 1376 Sync it now.
1377 */
d83d8461 1378 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1da177e4
LT		 1379
1380 return newsk;
1381 }
1382
1383 opt = np->opt;
1384
1385 if (sk_acceptq_is_full(sk))
1386 goto out_overflow;
1387
333fad53 1388 if (np->rxopt.bits.osrcrt == 2 &&
2e6599cb
ACM		 1389 opt == NULL && treq->pktopts) {
1390 struct inet6_skb_parm *rxopt = IP6CB(treq->pktopts);
1da177e4 1391 if (rxopt->srcrt)
d56f90a7
ACM		 1392 opt = ipv6_invert_rthdr(sk,
1393 (struct ipv6_rt_hdr *)(skb_network_header(treq->pktopts) +
1394 rxopt->srcrt));
1da177e4
LT		 1395 }
1396
1397 if (dst == NULL) {
1398 struct in6_addr *final_p = NULL, final;
1399 struct flowi fl;
1400
1401 memset(&fl, 0, sizeof(fl));
1402 fl.proto = IPPROTO_TCP;
2e6599cb 1403 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
1da177e4
LT		 1404 if (opt && opt->srcrt) {
1405 struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
1406 ipv6_addr_copy(&final, &fl.fl6_dst);
1407 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
1408 final_p = &final;
1409 }
2e6599cb 1410 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
1da177e4 1411 fl.oif = sk->sk_bound_dev_if;
2e6599cb 1412 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
1da177e4 1413 fl.fl_ip_sport = inet_sk(sk)->sport;
4237c75c 1414 security_req_classify_flow(req, &fl);
1da177e4
LT		 1415
1416 if (ip6_dst_lookup(sk, &dst, &fl))
1417 goto out;
1418
1419 if (final_p)
1420 ipv6_addr_copy(&fl.fl6_dst, final_p);
1421
1422 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
1423 goto out;
1ab1457c 1424 }
1da177e4
LT		 1425
1426 newsk = tcp_create_openreq_child(sk, req, skb);
1427 if (newsk == NULL)
1428 goto out;
1429
e6848976
ACM		 1430 /*
1431 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1432 * count here, tcp_create_openreq_child now does this for us, see the
1433 * comment in that function for the gory details. -acme
1434 */
1da177e4 1435
59eed279 1436 newsk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 1437 __ip6_dst_store(newsk, dst, NULL, NULL);
1da177e4
LT		 1438
1439 newtcp6sk = (struct tcp6_sock *)newsk;
1440 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1441
1442 newtp = tcp_sk(newsk);
1443 newinet = inet_sk(newsk);
1444 newnp = inet6_sk(newsk);
1445
1446 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1447
2e6599cb
ACM		 1448 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1449 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1450 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1451 newsk->sk_bound_dev_if = treq->iif;
1da177e4 1452
1ab1457c 1453 /* Now IPv6 options...
1da177e4
LT		 1454
1455 First: no IPv4 options.
1456 */
1457 newinet->opt = NULL;
d35690be 1458 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1459
1460 /* Clone RX bits */
1461 newnp->rxopt.all = np->rxopt.all;
1462
1463 /* Clone pktoptions received with SYN */
1464 newnp->pktoptions = NULL;
2e6599cb
ACM		 1465 if (treq->pktopts != NULL) {
1466 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1467 kfree_skb(treq->pktopts);
1468 treq->pktopts = NULL;
1da177e4
LT		 1469 if (newnp->pktoptions)
1470 skb_set_owner_r(newnp->pktoptions, newsk);
1471 }
1472 newnp->opt = NULL;
505cbfc5 1473 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1474 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4
LT		 1475
1476 /* Clone native IPv6 options from listening socket (if any)
1477
1478 Yes, keeping reference count would be much more clever,
1479 but we make one more one thing there: reattach optmem
1480 to newsk.
1481 */
1482 if (opt) {
1483 newnp->opt = ipv6_dup_options(newsk, opt);
1484 if (opt != np->opt)
1485 sock_kfree_s(sk, opt, opt->tot_len);
1486 }
1487
d83d8461 1488 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1da177e4 1489 if (newnp->opt)
d83d8461
ACM		 1490 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1491 newnp->opt->opt_flen);
1da177e4 1492
5d424d5a 1493 tcp_mtup_init(newsk);
1da177e4
LT		 1494 tcp_sync_mss(newsk, dst_mtu(dst));
1495 newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
1496 tcp_initialize_rcv_mss(newsk);
1497
1498 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
1499
cfb6eeb4
YH		 1500#ifdef CONFIG_TCP_MD5SIG
1501 /* Copy over the MD5 key from the original socket */
1502 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1503 /* We're using one, so create a matching key
1504 * on the newsk structure. If we fail to get
1505 * memory, then we end up not copying the key
1506 * across. Shucks.
1507 */
af879cc7
ACM		 1508 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1509 if (newkey != NULL)
cfb6eeb4
YH		 1510 tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
1511 newkey, key->keylen);
cfb6eeb4
YH		 1512 }
1513#endif
1514
90b19d31 1515 __inet6_hash(&tcp_hashinfo, newsk);
2d8c4ce5 1516 inet_inherit_port(&tcp_hashinfo, sk, newsk);
1da177e4
LT		 1517
1518 return newsk;
1519
1520out_overflow:
1521 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
1522out:
1523 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
1524 if (opt && opt != np->opt)
1525 sock_kfree_s(sk, opt, opt->tot_len);
1526 dst_release(dst);
1527 return NULL;
1528}
1529
b51655b9 1530static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1da177e4 1531{
84fa7933 1532 if (skb->ip_summed == CHECKSUM_COMPLETE) {
aa8223c7 1533 if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
0660e03f 1534 &ipv6_hdr(skb)->daddr, skb->csum)) {
fb286bb2 1535 skb->ip_summed = CHECKSUM_UNNECESSARY;
1da177e4 1536 return 0;
fb286bb2 1537 }
1da177e4 1538 }
fb286bb2 1539
aa8223c7 1540 skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
0660e03f
ACM		 1541 &ipv6_hdr(skb)->saddr,
1542 &ipv6_hdr(skb)->daddr, 0));
fb286bb2 1543
1da177e4 1544 if (skb->len <= 76) {
fb286bb2 1545 return __skb_checksum_complete(skb);
1da177e4
LT		 1546 }
1547 return 0;
1548}
1549
1550/* The socket must have it's spinlock held when we get
1551 * here.
1552 *
1553 * We have a potential double-lock case here, so even when
1554 * doing backlog processing we use the BH locking scheme.
1555 * This is because we cannot sleep with the original spinlock
1556 * held.
1557 */
1558static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1559{
1560 struct ipv6_pinfo *np = inet6_sk(sk);
1561 struct tcp_sock *tp;
1562 struct sk_buff *opt_skb = NULL;
1563
1564 /* Imagine: socket is IPv6. IPv4 packet arrives,
1565 goes to IPv4 receive handler and backlogged.
1566 From backlog it always goes here. Kerboom...
1567 Fortunately, tcp_rcv_established and rcv_established
1568 handle them correctly, but it is not case with
1569 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1570 */
1571
1572 if (skb->protocol == htons(ETH_P_IP))
1573 return tcp_v4_do_rcv(sk, skb);
1574
cfb6eeb4
YH		 1575#ifdef CONFIG_TCP_MD5SIG
1576 if (tcp_v6_inbound_md5_hash (sk, skb))
1577 goto discard;
1578#endif
1579
fda9ef5d 1580 if (sk_filter(sk, skb))
1da177e4
LT		 1581 goto discard;
1582
1583 /*
1584 * socket locking is here for SMP purposes as backlog rcv
1585 * is currently called with bh processing disabled.
1586 */
1587
1588 /* Do Stevens' IPV6_PKTOPTIONS.
1589
1590 Yes, guys, it is the only place in our code, where we
1591 may make it not affecting IPv4.
1592 The rest of code is protocol independent,
1593 and I do not like idea to uglify IPv4.
1594
1595 Actually, all the idea behind IPV6_PKTOPTIONS
1596 looks not very well thought. For now we latch
1597 options, received in the last packet, enqueued
1598 by tcp. Feel free to propose better solution.
1ab1457c 1599 --ANK (980728)
1da177e4
LT		 1600 */
1601 if (np->rxopt.all)
1602 opt_skb = skb_clone(skb, GFP_ATOMIC);
1603
1604 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
1605 TCP_CHECK_TIMER(sk);
aa8223c7 1606 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1da177e4
LT		 1607 goto reset;
1608 TCP_CHECK_TIMER(sk);
1609 if (opt_skb)
1610 goto ipv6_pktoptions;
1611 return 0;
1612 }
1613
ab6a5bb6 1614 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1da177e4
LT		 1615 goto csum_err;
1616
1ab1457c 1617 if (sk->sk_state == TCP_LISTEN) {
1da177e4
LT		 1618 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1619 if (!nsk)
1620 goto discard;
1621
1622 /*
1623 * Queue it on the new socket if the new socket is active,
1624 * otherwise we just shortcircuit this and continue with
1625 * the new socket..
1626 */
1ab1457c 1627 if(nsk != sk) {
1da177e4
LT		 1628 if (tcp_child_process(sk, nsk, skb))
1629 goto reset;
1630 if (opt_skb)
1631 __kfree_skb(opt_skb);
1632 return 0;
1633 }
1634 }
1635
1636 TCP_CHECK_TIMER(sk);
aa8223c7 1637 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1da177e4
LT		 1638 goto reset;
1639 TCP_CHECK_TIMER(sk);
1640 if (opt_skb)
1641 goto ipv6_pktoptions;
1642 return 0;
1643
1644reset:
cfb6eeb4 1645 tcp_v6_send_reset(sk, skb);
1da177e4
LT		 1646discard:
1647 if (opt_skb)
1648 __kfree_skb(opt_skb);
1649 kfree_skb(skb);
1650 return 0;
1651csum_err:
1652 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1653 goto discard;
1654
1655
1656ipv6_pktoptions:
1657 /* Do you ask, what is it?
1658
1659 1. skb was enqueued by tcp.
1660 2. skb is added to tail of read queue, rather than out of order.
1661 3. socket is not in passive state.
1662 4. Finally, it really contains options, which user wants to receive.
1663 */
1664 tp = tcp_sk(sk);
1665 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1666 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
333fad53 1667 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
505cbfc5 1668 np->mcast_oif = inet6_iif(opt_skb);
333fad53 1669 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
0660e03f 1670 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1da177e4
LT		 1671 if (ipv6_opt_accepted(sk, opt_skb)) {
1672 skb_set_owner_r(opt_skb, sk);
1673 opt_skb = xchg(&np->pktoptions, opt_skb);
1674 } else {
1675 __kfree_skb(opt_skb);
1676 opt_skb = xchg(&np->pktoptions, NULL);
1677 }
1678 }
1679
1680 if (opt_skb)
1681 kfree_skb(opt_skb);
1682 return 0;
1683}
1684
951dbc8a 1685static int tcp_v6_rcv(struct sk_buff **pskb)
1da177e4
LT		 1686{
1687 struct sk_buff *skb = *pskb;
1ab1457c 1688 struct tcphdr *th;
1da177e4
LT		 1689 struct sock *sk;
1690 int ret;
1691
1692 if (skb->pkt_type != PACKET_HOST)
1693 goto discard_it;
1694
1695 /*
1696 * Count it even if it's bad.
1697 */
1698 TCP_INC_STATS_BH(TCP_MIB_INSEGS);
1699
1700 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1701 goto discard_it;
1702
aa8223c7 1703 th = tcp_hdr(skb);
1da177e4
LT		 1704
1705 if (th->doff < sizeof(struct tcphdr)/4)
1706 goto bad_packet;
1707 if (!pskb_may_pull(skb, th->doff*4))
1708 goto discard_it;
1709
60476372 1710 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1da177e4
LT		 1711 goto bad_packet;
1712
aa8223c7 1713 th = tcp_hdr(skb);
1da177e4
LT		 1714 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1715 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1716 skb->len - th->doff*4);
1717 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1718 TCP_SKB_CB(skb)->when = 0;
0660e03f 1719 TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb));
1da177e4
LT		 1720 TCP_SKB_CB(skb)->sacked = 0;
1721
0660e03f
ACM		 1722 sk = __inet6_lookup(&tcp_hashinfo, &ipv6_hdr(skb)->saddr, th->source,
1723 &ipv6_hdr(skb)->daddr, ntohs(th->dest),
505cbfc5 1724 inet6_iif(skb));
1da177e4
LT		 1725
1726 if (!sk)
1727 goto no_tcp_socket;
1728
1729process:
1730 if (sk->sk_state == TCP_TIME_WAIT)
1731 goto do_time_wait;
1732
1733 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1734 goto discard_and_relse;
1735
fda9ef5d 1736 if (sk_filter(sk, skb))
1da177e4
LT		 1737 goto discard_and_relse;
1738
1739 skb->dev = NULL;
1740
293b9c42 1741 bh_lock_sock_nested(sk);
1da177e4
LT		 1742 ret = 0;
1743 if (!sock_owned_by_user(sk)) {
1a2449a8 1744#ifdef CONFIG_NET_DMA
1ab1457c
YH		 1745 struct tcp_sock *tp = tcp_sk(sk);
1746 if (tp->ucopy.dma_chan)
1747 ret = tcp_v6_do_rcv(sk, skb);
1748 else
1a2449a8
CL		 1749#endif
1750 {
1751 if (!tcp_prequeue(sk, skb))
1752 ret = tcp_v6_do_rcv(sk, skb);
1753 }
1da177e4
LT		 1754 } else
1755 sk_add_backlog(sk, skb);
1756 bh_unlock_sock(sk);
1757
1758 sock_put(sk);
1759 return ret ? -1 : 0;
1760
1761no_tcp_socket:
1762 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1763 goto discard_it;
1764
1765 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1766bad_packet:
1767 TCP_INC_STATS_BH(TCP_MIB_INERRS);
1768 } else {
cfb6eeb4 1769 tcp_v6_send_reset(NULL, skb);
1da177e4
LT		 1770 }
1771
1772discard_it:
1773
1774 /*
1775 * Discard frame
1776 */
1777
1778 kfree_skb(skb);
1779 return 0;
1780
1781discard_and_relse:
1782 sock_put(sk);
1783 goto discard_it;
1784
1785do_time_wait:
1786 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
9469c7b4 1787 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1788 goto discard_it;
1789 }
1790
1791 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1792 TCP_INC_STATS_BH(TCP_MIB_INERRS);
9469c7b4 1793 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1794 goto discard_it;
1795 }
1796
9469c7b4 1797 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1da177e4
LT		 1798 case TCP_TW_SYN:
1799 {
1800 struct sock *sk2;
1801
505cbfc5 1802 sk2 = inet6_lookup_listener(&tcp_hashinfo,
0660e03f 1803 &ipv6_hdr(skb)->daddr,
505cbfc5 1804 ntohs(th->dest), inet6_iif(skb));
1da177e4 1805 if (sk2 != NULL) {
295ff7ed
ACM		 1806 struct inet_timewait_sock *tw = inet_twsk(sk);
1807 inet_twsk_deschedule(tw, &tcp_death_row);
1808 inet_twsk_put(tw);
1da177e4
LT		 1809 sk = sk2;
1810 goto process;
1811 }
1812 /* Fall through to ACK */
1813 }
1814 case TCP_TW_ACK:
1815 tcp_v6_timewait_ack(sk, skb);
1816 break;
1817 case TCP_TW_RST:
1818 goto no_tcp_socket;
1819 case TCP_TW_SUCCESS:;
1820 }
1821 goto discard_it;
1822}
1823
1da177e4
LT		 1824static int tcp_v6_remember_stamp(struct sock *sk)
1825{
1826 /* Alas, not yet... */
1827 return 0;
1828}
1829
8292a17a 1830static struct inet_connection_sock_af_ops ipv6_specific = {
543d9cfe
ACM		 1831 .queue_xmit = inet6_csk_xmit,
1832 .send_check = tcp_v6_send_check,
1833 .rebuild_header = inet6_sk_rebuild_header,
1834 .conn_request = tcp_v6_conn_request,
1835 .syn_recv_sock = tcp_v6_syn_recv_sock,
1836 .remember_stamp = tcp_v6_remember_stamp,
1837 .net_header_len = sizeof(struct ipv6hdr),
1838 .setsockopt = ipv6_setsockopt,
1839 .getsockopt = ipv6_getsockopt,
1840 .addr2sockaddr = inet6_csk_addr2sockaddr,
1841 .sockaddr_len = sizeof(struct sockaddr_in6),
3fdadf7d 1842#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1843 .compat_setsockopt = compat_ipv6_setsockopt,
1844 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1845#endif
1da177e4
LT		 1846};
1847
cfb6eeb4 1848#ifdef CONFIG_TCP_MD5SIG
a928630a 1849static struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
cfb6eeb4
YH		 1850 .md5_lookup = tcp_v6_md5_lookup,
1851 .calc_md5_hash = tcp_v6_calc_md5_hash,
1852 .md5_add = tcp_v6_md5_add_func,
1853 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1854};
a928630a 1855#endif
cfb6eeb4 1856
1da177e4
LT		 1857/*
1858 * TCP over IPv4 via INET6 API
1859 */
1860
8292a17a 1861static struct inet_connection_sock_af_ops ipv6_mapped = {
543d9cfe
ACM		 1862 .queue_xmit = ip_queue_xmit,
1863 .send_check = tcp_v4_send_check,
1864 .rebuild_header = inet_sk_rebuild_header,
1865 .conn_request = tcp_v6_conn_request,
1866 .syn_recv_sock = tcp_v6_syn_recv_sock,
1867 .remember_stamp = tcp_v4_remember_stamp,
1868 .net_header_len = sizeof(struct iphdr),
1869 .setsockopt = ipv6_setsockopt,
1870 .getsockopt = ipv6_getsockopt,
1871 .addr2sockaddr = inet6_csk_addr2sockaddr,
1872 .sockaddr_len = sizeof(struct sockaddr_in6),
3fdadf7d 1873#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1874 .compat_setsockopt = compat_ipv6_setsockopt,
1875 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1876#endif
1da177e4
LT		 1877};
1878
cfb6eeb4 1879#ifdef CONFIG_TCP_MD5SIG
a928630a 1880static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
cfb6eeb4
YH		 1881 .md5_lookup = tcp_v4_md5_lookup,
1882 .calc_md5_hash = tcp_v4_calc_md5_hash,
1883 .md5_add = tcp_v6_md5_add_func,
1884 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1885};
a928630a 1886#endif
cfb6eeb4 1887
1da177e4
LT		 1888/* NOTE: A lot of things set to zero explicitly by call to
1889 * sk_alloc() so need not be done here.
1890 */
1891static int tcp_v6_init_sock(struct sock *sk)
1892{
6687e988 1893 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 1894 struct tcp_sock *tp = tcp_sk(sk);
1895
1896 skb_queue_head_init(&tp->out_of_order_queue);
1897 tcp_init_xmit_timers(sk);
1898 tcp_prequeue_init(tp);
1899
6687e988 1900 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1da177e4
LT		 1901 tp->mdev = TCP_TIMEOUT_INIT;
1902
1903 /* So many TCP implementations out there (incorrectly) count the
1904 * initial SYN frame in their delayed-ACK and congestion control
1905 * algorithms that we must have the following bandaid to talk
1906 * efficiently to them. -DaveM
1907 */
1908 tp->snd_cwnd = 2;
1909
1910 /* See draft-stevens-tcpca-spec-01 for discussion of the
1911 * initialization of these values.
1912 */
1913 tp->snd_ssthresh = 0x7fffffff;
1914 tp->snd_cwnd_clamp = ~0;
c1b4a7e6 1915 tp->mss_cache = 536;
1da177e4
LT		 1916
1917 tp->reordering = sysctl_tcp_reordering;
1918
1919 sk->sk_state = TCP_CLOSE;
1920
8292a17a 1921 icsk->icsk_af_ops = &ipv6_specific;
6687e988 1922 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
d83d8461 1923 icsk->icsk_sync_mss = tcp_sync_mss;
1da177e4
LT		 1924 sk->sk_write_space = sk_stream_write_space;
1925 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1926
cfb6eeb4
YH		 1927#ifdef CONFIG_TCP_MD5SIG
1928 tp->af_specific = &tcp_sock_ipv6_specific;
1929#endif
1930
1da177e4
LT		 1931 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1932 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1933
1934 atomic_inc(&tcp_sockets_allocated);
1935
1936 return 0;
1937}
1938
1939static int tcp_v6_destroy_sock(struct sock *sk)
1940{
cfb6eeb4
YH		 1941#ifdef CONFIG_TCP_MD5SIG
1942 /* Clean up the MD5 key list */
1943 if (tcp_sk(sk)->md5sig_info)
1944 tcp_v6_clear_md5_list(sk);
1945#endif
1da177e4
LT		 1946 tcp_v4_destroy_sock(sk);
1947 return inet6_destroy_sock(sk);
1948}
1949
1950/* Proc filesystem TCPv6 sock list dumping. */
1ab1457c 1951static void get_openreq6(struct seq_file *seq,
60236fdd 1952 struct sock *sk, struct request_sock *req, int i, int uid)
1da177e4 1953{
1da177e4 1954 int ttd = req->expires - jiffies;
ca304b61
ACM		 1955 struct in6_addr *src = &inet6_rsk(req)->loc_addr;
1956 struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1da177e4
LT		 1957
1958 if (ttd < 0)
1959 ttd = 0;
1960
1da177e4
LT		 1961 seq_printf(seq,
1962 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1963 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
1964 i,
1965 src->s6_addr32[0], src->s6_addr32[1],
1966 src->s6_addr32[2], src->s6_addr32[3],
1967 ntohs(inet_sk(sk)->sport),
1968 dest->s6_addr32[0], dest->s6_addr32[1],
1969 dest->s6_addr32[2], dest->s6_addr32[3],
2e6599cb 1970 ntohs(inet_rsk(req)->rmt_port),
1da177e4
LT		 1971 TCP_SYN_RECV,
1972 0,0, /* could print option size, but that is af dependent. */
1ab1457c
YH		 1973 1, /* timers active (only the expire timer) */
1974 jiffies_to_clock_t(ttd),
1da177e4
LT		 1975 req->retrans,
1976 uid,
1ab1457c 1977 0, /* non standard timer */
1da177e4
LT		 1978 0, /* open_requests have no inode */
1979 0, req);
1980}
1981
1982static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
1983{
1984 struct in6_addr *dest, *src;
1985 __u16 destp, srcp;
1986 int timer_active;
1987 unsigned long timer_expires;
1988 struct inet_sock *inet = inet_sk(sp);
1989 struct tcp_sock *tp = tcp_sk(sp);
463c84b9 1990 const struct inet_connection_sock *icsk = inet_csk(sp);
1da177e4
LT		 1991 struct ipv6_pinfo *np = inet6_sk(sp);
1992
1993 dest = &np->daddr;
1994 src = &np->rcv_saddr;
1995 destp = ntohs(inet->dport);
1996 srcp = ntohs(inet->sport);
463c84b9
ACM		 1997
1998 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1da177e4 1999 timer_active = 1;
463c84b9
ACM		 2000 timer_expires = icsk->icsk_timeout;
2001 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1da177e4 2002 timer_active = 4;
463c84b9 2003 timer_expires = icsk->icsk_timeout;
1da177e4
LT		 2004 } else if (timer_pending(&sp->sk_timer)) {
2005 timer_active = 2;
2006 timer_expires = sp->sk_timer.expires;
2007 } else {
2008 timer_active = 0;
2009 timer_expires = jiffies;
2010 }
2011
2012 seq_printf(seq,
2013 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2014 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
2015 i,
2016 src->s6_addr32[0], src->s6_addr32[1],
2017 src->s6_addr32[2], src->s6_addr32[3], srcp,
2018 dest->s6_addr32[0], dest->s6_addr32[1],
2019 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1ab1457c 2020 sp->sk_state,
47da8ee6
SS		 2021 tp->write_seq-tp->snd_una,
2022 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1da177e4
LT		 2023 timer_active,
2024 jiffies_to_clock_t(timer_expires - jiffies),
463c84b9 2025 icsk->icsk_retransmits,
1da177e4 2026 sock_i_uid(sp),
6687e988 2027 icsk->icsk_probes_out,
1da177e4
LT		 2028 sock_i_ino(sp),
2029 atomic_read(&sp->sk_refcnt), sp,
463c84b9
ACM		 2030 icsk->icsk_rto,
2031 icsk->icsk_ack.ato,
2032 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
1da177e4
LT		 2033 tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
2034 );
2035}
2036
1ab1457c 2037static void get_timewait6_sock(struct seq_file *seq,
8feaf0c0 2038 struct inet_timewait_sock *tw, int i)
1da177e4
LT		 2039{
2040 struct in6_addr *dest, *src;
2041 __u16 destp, srcp;
0fa1a53e 2042 struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1da177e4
LT		 2043 int ttd = tw->tw_ttd - jiffies;
2044
2045 if (ttd < 0)
2046 ttd = 0;
2047
0fa1a53e
ACM		 2048 dest = &tw6->tw_v6_daddr;
2049 src = &tw6->tw_v6_rcv_saddr;
1da177e4
LT		 2050 destp = ntohs(tw->tw_dport);
2051 srcp = ntohs(tw->tw_sport);
2052
2053 seq_printf(seq,
2054 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
2055 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",
2056 i,
2057 src->s6_addr32[0], src->s6_addr32[1],
2058 src->s6_addr32[2], src->s6_addr32[3], srcp,
2059 dest->s6_addr32[0], dest->s6_addr32[1],
2060 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2061 tw->tw_substate, 0, 0,
2062 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2063 atomic_read(&tw->tw_refcnt), tw);
2064}
2065
2066#ifdef CONFIG_PROC_FS
2067static int tcp6_seq_show(struct seq_file *seq, void *v)
2068{
2069 struct tcp_iter_state *st;
2070
2071 if (v == SEQ_START_TOKEN) {
2072 seq_puts(seq,
2073 " sl "
2074 "local_address "
2075 "remote_address "
2076 "st tx_queue rx_queue tr tm->when retrnsmt"
2077 " uid timeout inode\n");
2078 goto out;
2079 }
2080 st = seq->private;
2081
2082 switch (st->state) {
2083 case TCP_SEQ_STATE_LISTENING:
2084 case TCP_SEQ_STATE_ESTABLISHED:
2085 get_tcp6_sock(seq, v, st->num);
2086 break;
2087 case TCP_SEQ_STATE_OPENREQ:
2088 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2089 break;
2090 case TCP_SEQ_STATE_TIME_WAIT:
2091 get_timewait6_sock(seq, v, st->num);
2092 break;
2093 }
2094out:
2095 return 0;
2096}
2097
2098static struct file_operations tcp6_seq_fops;
2099static struct tcp_seq_afinfo tcp6_seq_afinfo = {
2100 .owner = THIS_MODULE,
2101 .name = "tcp6",
2102 .family = AF_INET6,
2103 .seq_show = tcp6_seq_show,
2104 .seq_fops = &tcp6_seq_fops,
2105};
2106
2107int __init tcp6_proc_init(void)
2108{
2109 return tcp_proc_register(&tcp6_seq_afinfo);
2110}
2111
2112void tcp6_proc_exit(void)
2113{
2114 tcp_proc_unregister(&tcp6_seq_afinfo);
2115}
2116#endif
2117
2118struct proto tcpv6_prot = {
2119 .name = "TCPv6",
2120 .owner = THIS_MODULE,
2121 .close = tcp_close,
2122 .connect = tcp_v6_connect,
2123 .disconnect = tcp_disconnect,
463c84b9 2124 .accept = inet_csk_accept,
1da177e4
LT		 2125 .ioctl = tcp_ioctl,
2126 .init = tcp_v6_init_sock,
2127 .destroy = tcp_v6_destroy_sock,
2128 .shutdown = tcp_shutdown,
2129 .setsockopt = tcp_setsockopt,
2130 .getsockopt = tcp_getsockopt,
2131 .sendmsg = tcp_sendmsg,
2132 .recvmsg = tcp_recvmsg,
2133 .backlog_rcv = tcp_v6_do_rcv,
2134 .hash = tcp_v6_hash,
2135 .unhash = tcp_unhash,
2136 .get_port = tcp_v6_get_port,
2137 .enter_memory_pressure = tcp_enter_memory_pressure,
2138 .sockets_allocated = &tcp_sockets_allocated,
2139 .memory_allocated = &tcp_memory_allocated,
2140 .memory_pressure = &tcp_memory_pressure,
0a5578cf 2141 .orphan_count = &tcp_orphan_count,
1da177e4
LT		 2142 .sysctl_mem = sysctl_tcp_mem,
2143 .sysctl_wmem = sysctl_tcp_wmem,
2144 .sysctl_rmem = sysctl_tcp_rmem,
2145 .max_header = MAX_TCP_HEADER,
2146 .obj_size = sizeof(struct tcp6_sock),
6d6ee43e 2147 .twsk_prot = &tcp6_timewait_sock_ops,
60236fdd 2148 .rsk_prot = &tcp6_request_sock_ops,
543d9cfe
ACM		 2149#ifdef CONFIG_COMPAT
2150 .compat_setsockopt = compat_tcp_setsockopt,
2151 .compat_getsockopt = compat_tcp_getsockopt,
2152#endif
1da177e4
LT		 2153};
2154
2155static struct inet6_protocol tcpv6_protocol = {
2156 .handler = tcp_v6_rcv,
2157 .err_handler = tcp_v6_err,
a430a43d 2158 .gso_send_check = tcp_v6_gso_send_check,
adcfc7d0 2159 .gso_segment = tcp_tso_segment,
1da177e4
LT		 2160 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2161};
2162
1da177e4
LT		 2163static struct inet_protosw tcpv6_protosw = {
2164 .type = SOCK_STREAM,
2165 .protocol = IPPROTO_TCP,
2166 .prot = &tcpv6_prot,
2167 .ops = &inet6_stream_ops,
2168 .capability = -1,
2169 .no_check = 0,
d83d8461
ACM		 2170 .flags = INET_PROTOSW_PERMANENT |
2171 INET_PROTOSW_ICSK,
1da177e4
LT		 2172};
2173
2174void __init tcpv6_init(void)
2175{
2176 /* register inet6 protocol */
2177 if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0)
2178 printk(KERN_ERR "tcpv6_init: Could not register protocol\n");
2179 inet6_register_protosw(&tcpv6_protosw);
ae0f7d5f 2180
c4d93909
ACM		 2181 if (inet_csk_ctl_sock_create(&tcp6_socket, PF_INET6, SOCK_RAW,
2182 IPPROTO_TCP) < 0)
ae0f7d5f 2183 panic("Failed to create the TCPv6 control socket.\n");
1da177e4 2184}
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