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socket: initial cgroup code.
[GitHub/mt8127/android_kernel_alcatel_ttab.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 7 *
1ab1457c 8 * Based on:
1da177e4
LT		 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
eb4dea58 26#include <linux/bottom_half.h>
1da177e4 27#include <linux/module.h>
1da177e4
LT		 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>
5a0e3ad6 41#include <linux/slab.h>
1da177e4
LT		 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>
1da177e4
LT		 59#include <net/snmp.h>
60#include <net/dsfield.h>
6d6ee43e 61#include <net/timewait_sock.h>
18134bed 62#include <net/netdma.h>
3d58b5fa 63#include <net/inet_common.h>
6e5714ea 64#include <net/secure_seq.h>
1da177e4
LT		 65
66#include <asm/uaccess.h>
67
68#include <linux/proc_fs.h>
69#include <linux/seq_file.h>
70
cfb6eeb4
YH		 71#include <linux/crypto.h>
72#include <linux/scatterlist.h>
73
cfb6eeb4 74static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb);
6edafaaf
GJ		 75static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
76 struct request_sock *req);
1da177e4
LT		 77
78static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
8ad50d96 79static void __tcp_v6_send_check(struct sk_buff *skb,
b71d1d42
ED		 80 const struct in6_addr *saddr,
81 const struct in6_addr *daddr);
1da177e4 82
3b401a81
SH		 83static const struct inet_connection_sock_af_ops ipv6_mapped;
84static const struct inet_connection_sock_af_ops ipv6_specific;
a928630a 85#ifdef CONFIG_TCP_MD5SIG
b2e4b3de
SH		 86static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
87static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
9501f972
YH		 88#else
89static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
b71d1d42 90 const struct in6_addr *addr)
9501f972
YH		 91{
92 return NULL;
93}
a928630a 94#endif
1da177e4 95
1da177e4
LT		 96static void tcp_v6_hash(struct sock *sk)
97{
98 if (sk->sk_state != TCP_CLOSE) {
8292a17a 99 if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) {
1da177e4
LT		 100 tcp_prot.hash(sk);
101 return;
102 }
103 local_bh_disable();
9327f705 104 __inet6_hash(sk, NULL);
1da177e4
LT		 105 local_bh_enable();
106 }
107}
108
684f2176 109static __inline__ __sum16 tcp_v6_check(int len,
b71d1d42
ED		 110 const struct in6_addr *saddr,
111 const struct in6_addr *daddr,
868c86bc 112 __wsum base)
1da177e4
LT		 113{
114 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
115}
116
cf533ea5 117static __u32 tcp_v6_init_sequence(const struct sk_buff *skb)
1da177e4 118{
0660e03f
ACM		 119 return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32,
120 ipv6_hdr(skb)->saddr.s6_addr32,
aa8223c7
ACM		 121 tcp_hdr(skb)->dest,
122 tcp_hdr(skb)->source);
1da177e4
LT		 123}
124
1ab1457c 125static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
1da177e4
LT		 126 int addr_len)
127{
128 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
1ab1457c 129 struct inet_sock *inet = inet_sk(sk);
d83d8461 130 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 131 struct ipv6_pinfo *np = inet6_sk(sk);
132 struct tcp_sock *tp = tcp_sk(sk);
20c59de2 133 struct in6_addr *saddr = NULL, *final_p, final;
493f377d 134 struct rt6_info *rt;
4c9483b2 135 struct flowi6 fl6;
1da177e4
LT		 136 struct dst_entry *dst;
137 int addr_type;
138 int err;
139
1ab1457c 140 if (addr_len < SIN6_LEN_RFC2133)
1da177e4
LT		 141 return -EINVAL;
142
1ab1457c 143 if (usin->sin6_family != AF_INET6)
a02cec21 144 return -EAFNOSUPPORT;
1da177e4 145
4c9483b2 146 memset(&fl6, 0, sizeof(fl6));
1da177e4
LT		 147
148 if (np->sndflow) {
4c9483b2
DM		 149 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
150 IP6_ECN_flow_init(fl6.flowlabel);
151 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1da177e4 152 struct ip6_flowlabel *flowlabel;
4c9483b2 153 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1da177e4
LT		 154 if (flowlabel == NULL)
155 return -EINVAL;
4e3fd7a0 156 usin->sin6_addr = flowlabel->dst;
1da177e4
LT		 157 fl6_sock_release(flowlabel);
158 }
159 }
160
161 /*
1ab1457c
YH		 162 * connect() to INADDR_ANY means loopback (BSD'ism).
163 */
164
165 if(ipv6_addr_any(&usin->sin6_addr))
166 usin->sin6_addr.s6_addr[15] = 0x1;
1da177e4
LT		 167
168 addr_type = ipv6_addr_type(&usin->sin6_addr);
169
170 if(addr_type & IPV6_ADDR_MULTICAST)
171 return -ENETUNREACH;
172
173 if (addr_type&IPV6_ADDR_LINKLOCAL) {
174 if (addr_len >= sizeof(struct sockaddr_in6) &&
175 usin->sin6_scope_id) {
176 /* If interface is set while binding, indices
177 * must coincide.
178 */
179 if (sk->sk_bound_dev_if &&
180 sk->sk_bound_dev_if != usin->sin6_scope_id)
181 return -EINVAL;
182
183 sk->sk_bound_dev_if = usin->sin6_scope_id;
184 }
185
186 /* Connect to link-local address requires an interface */
187 if (!sk->sk_bound_dev_if)
188 return -EINVAL;
189 }
190
191 if (tp->rx_opt.ts_recent_stamp &&
192 !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) {
193 tp->rx_opt.ts_recent = 0;
194 tp->rx_opt.ts_recent_stamp = 0;
195 tp->write_seq = 0;
196 }
197
4e3fd7a0 198 np->daddr = usin->sin6_addr;
4c9483b2 199 np->flow_label = fl6.flowlabel;
1da177e4
LT		 200
201 /*
202 * TCP over IPv4
203 */
204
205 if (addr_type == IPV6_ADDR_MAPPED) {
d83d8461 206 u32 exthdrlen = icsk->icsk_ext_hdr_len;
1da177e4
LT		 207 struct sockaddr_in sin;
208
209 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
210
211 if (__ipv6_only_sock(sk))
212 return -ENETUNREACH;
213
214 sin.sin_family = AF_INET;
215 sin.sin_port = usin->sin6_port;
216 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
217
d83d8461 218 icsk->icsk_af_ops = &ipv6_mapped;
1da177e4 219 sk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 220#ifdef CONFIG_TCP_MD5SIG
221 tp->af_specific = &tcp_sock_ipv6_mapped_specific;
222#endif
1da177e4
LT		 223
224 err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
225
226 if (err) {
d83d8461
ACM		 227 icsk->icsk_ext_hdr_len = exthdrlen;
228 icsk->icsk_af_ops = &ipv6_specific;
1da177e4 229 sk->sk_backlog_rcv = tcp_v6_do_rcv;
cfb6eeb4
YH		 230#ifdef CONFIG_TCP_MD5SIG
231 tp->af_specific = &tcp_sock_ipv6_specific;
232#endif
1da177e4
LT		 233 goto failure;
234 } else {
c720c7e8
ED		 235 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
236 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
237 &np->rcv_saddr);
1da177e4
LT		 238 }
239
240 return err;
241 }
242
243 if (!ipv6_addr_any(&np->rcv_saddr))
244 saddr = &np->rcv_saddr;
245
4c9483b2 246 fl6.flowi6_proto = IPPROTO_TCP;
4e3fd7a0
AD		 247 fl6.daddr = np->daddr;
248 fl6.saddr = saddr ? *saddr : np->saddr;
4c9483b2
DM		 249 fl6.flowi6_oif = sk->sk_bound_dev_if;
250 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 251 fl6.fl6_dport = usin->sin6_port;
252 fl6.fl6_sport = inet->inet_sport;
1da177e4 253
4c9483b2 254 final_p = fl6_update_dst(&fl6, np->opt, &final);
1da177e4 255
4c9483b2 256 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
beb8d13b 257
4c9483b2 258 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
68d0c6d3
DM		 259 if (IS_ERR(dst)) {
260 err = PTR_ERR(dst);
1da177e4 261 goto failure;
14e50e57 262 }
1da177e4
LT		 263
264 if (saddr == NULL) {
4c9483b2 265 saddr = &fl6.saddr;
4e3fd7a0 266 np->rcv_saddr = *saddr;
1da177e4
LT		 267 }
268
269 /* set the source address */
4e3fd7a0 270 np->saddr = *saddr;
c720c7e8 271 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1da177e4 272
f83ef8c0 273 sk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 274 __ip6_dst_store(sk, dst, NULL, NULL);
1da177e4 275
493f377d
DM		 276 rt = (struct rt6_info *) dst;
277 if (tcp_death_row.sysctl_tw_recycle &&
278 !tp->rx_opt.ts_recent_stamp &&
279 ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) {
280 struct inet_peer *peer = rt6_get_peer(rt);
281 /*
282 * VJ's idea. We save last timestamp seen from
283 * the destination in peer table, when entering state
284 * TIME-WAIT * and initialize rx_opt.ts_recent from it,
285 * when trying new connection.
286 */
287 if (peer) {
288 inet_peer_refcheck(peer);
289 if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
290 tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
291 tp->rx_opt.ts_recent = peer->tcp_ts;
292 }
293 }
294 }
295
d83d8461 296 icsk->icsk_ext_hdr_len = 0;
1da177e4 297 if (np->opt)
d83d8461
ACM		 298 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
299 np->opt->opt_nflen);
1da177e4
LT		 300
301 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
302
c720c7e8 303 inet->inet_dport = usin->sin6_port;
1da177e4
LT		 304
305 tcp_set_state(sk, TCP_SYN_SENT);
d8313f5c 306 err = inet6_hash_connect(&tcp_death_row, sk);
1da177e4
LT		 307 if (err)
308 goto late_failure;
309
310 if (!tp->write_seq)
311 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
312 np->daddr.s6_addr32,
c720c7e8
ED		 313 inet->inet_sport,
314 inet->inet_dport);
1da177e4
LT		 315
316 err = tcp_connect(sk);
317 if (err)
318 goto late_failure;
319
320 return 0;
321
322late_failure:
323 tcp_set_state(sk, TCP_CLOSE);
324 __sk_dst_reset(sk);
325failure:
c720c7e8 326 inet->inet_dport = 0;
1da177e4
LT		 327 sk->sk_route_caps = 0;
328 return err;
329}
330
331static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
d5fdd6ba 332 u8 type, u8 code, int offset, __be32 info)
1da177e4 333{
b71d1d42 334 const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
505cbfc5 335 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
1da177e4
LT		 336 struct ipv6_pinfo *np;
337 struct sock *sk;
338 int err;
1ab1457c 339 struct tcp_sock *tp;
1da177e4 340 __u32 seq;
ca12a1a4 341 struct net *net = dev_net(skb->dev);
1da177e4 342
ca12a1a4 343 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
d86e0dac 344 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
1da177e4
LT		 345
346 if (sk == NULL) {
e41b5368
DL		 347 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
348 ICMP6_MIB_INERRORS);
1da177e4
LT		 349 return;
350 }
351
352 if (sk->sk_state == TCP_TIME_WAIT) {
9469c7b4 353 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 354 return;
355 }
356
357 bh_lock_sock(sk);
358 if (sock_owned_by_user(sk))
de0744af 359 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
1da177e4
LT		 360
361 if (sk->sk_state == TCP_CLOSE)
362 goto out;
363
e802af9c
SH		 364 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
365 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
366 goto out;
367 }
368
1da177e4 369 tp = tcp_sk(sk);
1ab1457c 370 seq = ntohl(th->seq);
1da177e4
LT		 371 if (sk->sk_state != TCP_LISTEN &&
372 !between(seq, tp->snd_una, tp->snd_nxt)) {
de0744af 373 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
1da177e4
LT		 374 goto out;
375 }
376
377 np = inet6_sk(sk);
378
379 if (type == ICMPV6_PKT_TOOBIG) {
68d0c6d3 380 struct dst_entry *dst;
1da177e4
LT		 381
382 if (sock_owned_by_user(sk))
383 goto out;
384 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
385 goto out;
386
387 /* icmp should have updated the destination cache entry */
388 dst = __sk_dst_check(sk, np->dst_cookie);
389
390 if (dst == NULL) {
391 struct inet_sock *inet = inet_sk(sk);
4c9483b2 392 struct flowi6 fl6;
1da177e4
LT		 393
394 /* BUGGG_FUTURE: Again, it is not clear how
395 to handle rthdr case. Ignore this complexity
396 for now.
397 */
4c9483b2
DM		 398 memset(&fl6, 0, sizeof(fl6));
399 fl6.flowi6_proto = IPPROTO_TCP;
4e3fd7a0
AD		 400 fl6.daddr = np->daddr;
401 fl6.saddr = np->saddr;
4c9483b2
DM		 402 fl6.flowi6_oif = sk->sk_bound_dev_if;
403 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 404 fl6.fl6_dport = inet->inet_dport;
405 fl6.fl6_sport = inet->inet_sport;
4c9483b2
DM		 406 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
407
408 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
68d0c6d3
DM		 409 if (IS_ERR(dst)) {
410 sk->sk_err_soft = -PTR_ERR(dst);
1da177e4
LT		 411 goto out;
412 }
413
414 } else
415 dst_hold(dst);
416
d83d8461 417 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
1da177e4
LT		 418 tcp_sync_mss(sk, dst_mtu(dst));
419 tcp_simple_retransmit(sk);
420 } /* else let the usual retransmit timer handle it */
421 dst_release(dst);
422 goto out;
423 }
424
425 icmpv6_err_convert(type, code, &err);
426
60236fdd 427 /* Might be for an request_sock */
1da177e4 428 switch (sk->sk_state) {
60236fdd 429 struct request_sock *req, **prev;
1da177e4
LT		 430 case TCP_LISTEN:
431 if (sock_owned_by_user(sk))
432 goto out;
433
8129765a
ACM		 434 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
435 &hdr->saddr, inet6_iif(skb));
1da177e4
LT		 436 if (!req)
437 goto out;
438
439 /* ICMPs are not backlogged, hence we cannot get
440 * an established socket here.
441 */
547b792c 442 WARN_ON(req->sk != NULL);
1da177e4 443
2e6599cb 444 if (seq != tcp_rsk(req)->snt_isn) {
de0744af 445 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
1da177e4
LT		 446 goto out;
447 }
448
463c84b9 449 inet_csk_reqsk_queue_drop(sk, req, prev);
1da177e4
LT		 450 goto out;
451
452 case TCP_SYN_SENT:
453 case TCP_SYN_RECV: /* Cannot happen.
1ab1457c 454 It can, it SYNs are crossed. --ANK */
1da177e4 455 if (!sock_owned_by_user(sk)) {
1da177e4
LT		 456 sk->sk_err = err;
457 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
458
459 tcp_done(sk);
460 } else
461 sk->sk_err_soft = err;
462 goto out;
463 }
464
465 if (!sock_owned_by_user(sk) && np->recverr) {
466 sk->sk_err = err;
467 sk->sk_error_report(sk);
468 } else
469 sk->sk_err_soft = err;
470
471out:
472 bh_unlock_sock(sk);
473 sock_put(sk);
474}
475
476
e6b4d113
WAS		 477static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
478 struct request_values *rvp)
1da177e4 479{
ca304b61 480 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 481 struct ipv6_pinfo *np = inet6_sk(sk);
482 struct sk_buff * skb;
483 struct ipv6_txoptions *opt = NULL;
20c59de2 484 struct in6_addr * final_p, final;
4c9483b2 485 struct flowi6 fl6;
fd80eb94 486 struct dst_entry *dst;
68d0c6d3 487 int err;
1da177e4 488
4c9483b2
DM		 489 memset(&fl6, 0, sizeof(fl6));
490 fl6.flowi6_proto = IPPROTO_TCP;
4e3fd7a0
AD		 491 fl6.daddr = treq->rmt_addr;
492 fl6.saddr = treq->loc_addr;
4c9483b2
DM		 493 fl6.flowlabel = 0;
494 fl6.flowi6_oif = treq->iif;
495 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 496 fl6.fl6_dport = inet_rsk(req)->rmt_port;
497 fl6.fl6_sport = inet_rsk(req)->loc_port;
4c9483b2 498 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
1da177e4 499
fd80eb94 500 opt = np->opt;
4c9483b2 501 final_p = fl6_update_dst(&fl6, opt, &final);
1da177e4 502
4c9483b2 503 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
68d0c6d3
DM		 504 if (IS_ERR(dst)) {
505 err = PTR_ERR(dst);
738faca3 506 dst = NULL;
fd80eb94 507 goto done;
68d0c6d3 508 }
e6b4d113 509 skb = tcp_make_synack(sk, dst, req, rvp);
68d0c6d3 510 err = -ENOMEM;
1da177e4 511 if (skb) {
8ad50d96 512 __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
1da177e4 513
4e3fd7a0 514 fl6.daddr = treq->rmt_addr;
b903d324 515 err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
b9df3cb8 516 err = net_xmit_eval(err);
1da177e4
LT		 517 }
518
519done:
1ab1457c 520 if (opt && opt != np->opt)
1da177e4 521 sock_kfree_s(sk, opt, opt->tot_len);
78b91042 522 dst_release(dst);
1da177e4
LT		 523 return err;
524}
525
72659ecc
OP		 526static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
527 struct request_values *rvp)
528{
529 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
530 return tcp_v6_send_synack(sk, req, rvp);
531}
532
60236fdd 533static void tcp_v6_reqsk_destructor(struct request_sock *req)
1da177e4 534{
800d55f1 535 kfree_skb(inet6_rsk(req)->pktopts);
1da177e4
LT		 536}
537
cfb6eeb4
YH		 538#ifdef CONFIG_TCP_MD5SIG
539static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
b71d1d42 540 const struct in6_addr *addr)
cfb6eeb4
YH		 541{
542 struct tcp_sock *tp = tcp_sk(sk);
543 int i;
544
545 BUG_ON(tp == NULL);
546
547 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
548 return NULL;
549
550 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 551 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
f8ab18d2 552 return &tp->md5sig_info->keys6[i].base;
cfb6eeb4
YH		 553 }
554 return NULL;
555}
556
557static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
558 struct sock *addr_sk)
559{
560 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
561}
562
563static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
564 struct request_sock *req)
565{
566 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
567}
568
b71d1d42 569static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer,
cfb6eeb4
YH		 570 char *newkey, u8 newkeylen)
571{
572 /* Add key to the list */
b0a713e9 573 struct tcp_md5sig_key *key;
cfb6eeb4
YH		 574 struct tcp_sock *tp = tcp_sk(sk);
575 struct tcp6_md5sig_key *keys;
576
b0a713e9 577 key = tcp_v6_md5_do_lookup(sk, peer);
cfb6eeb4
YH		 578 if (key) {
579 /* modify existing entry - just update that one */
b0a713e9
MD		 580 kfree(key->key);
581 key->key = newkey;
582 key->keylen = newkeylen;
cfb6eeb4
YH		 583 } else {
584 /* reallocate new list if current one is full. */
585 if (!tp->md5sig_info) {
586 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
587 if (!tp->md5sig_info) {
588 kfree(newkey);
589 return -ENOMEM;
590 }
a465419b 591 sk_nocaps_add(sk, NETIF_F_GSO_MASK);
cfb6eeb4 592 }
260fcbeb
YZ		 593 if (tp->md5sig_info->entries6 == 0 &&
594 tcp_alloc_md5sig_pool(sk) == NULL) {
aacbe8c8
YH		 595 kfree(newkey);
596 return -ENOMEM;
597 }
cfb6eeb4
YH		 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) {
cfb6eeb4 603 kfree(newkey);
260fcbeb
YZ		 604 if (tp->md5sig_info->entries6 == 0)
605 tcp_free_md5sig_pool();
cfb6eeb4
YH		 606 return -ENOMEM;
607 }
608
609 if (tp->md5sig_info->entries6)
610 memmove(keys, tp->md5sig_info->keys6,
611 (sizeof (tp->md5sig_info->keys6[0]) *
612 tp->md5sig_info->entries6));
613
614 kfree(tp->md5sig_info->keys6);
615 tp->md5sig_info->keys6 = keys;
616 tp->md5sig_info->alloced6++;
617 }
618
4e3fd7a0 619 tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr = *peer;
f8ab18d2
DM		 620 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
621 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
cfb6eeb4
YH		 622
623 tp->md5sig_info->entries6++;
624 }
625 return 0;
626}
627
628static 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
b71d1d42 635static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
cfb6eeb4
YH		 636{
637 struct tcp_sock *tp = tcp_sk(sk);
638 int i;
639
640 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 641 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
cfb6eeb4 642 /* Free the key */
f8ab18d2 643 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 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;
ca983cef 649 tp->md5sig_info->alloced6 = 0;
260fcbeb 650 tcp_free_md5sig_pool();
cfb6eeb4
YH		 651 } else {
652 /* shrink the database */
653 if (tp->md5sig_info->entries6 != i)
654 memmove(&tp->md5sig_info->keys6[i],
655 &tp->md5sig_info->keys6[i+1],
656 (tp->md5sig_info->entries6 - i)
657 * sizeof (tp->md5sig_info->keys6[0]));
658 }
77adefdc 659 return 0;
cfb6eeb4
YH		 660 }
661 }
662 return -ENOENT;
663}
664
665static 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++)
f8ab18d2 672 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 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++)
f8ab18d2 683 kfree(tp->md5sig_info->keys4[i].base.key);
cfb6eeb4
YH		 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
693static 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;
e773e4fa 712 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
cfb6eeb4
YH		 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;
a465419b 729 sk_nocaps_add(sk, NETIF_F_GSO_MASK);
cfb6eeb4
YH		 730 }
731
af879cc7 732 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
cfb6eeb4
YH		 733 if (!newkey)
734 return -ENOMEM;
e773e4fa 735 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
cfb6eeb4
YH		 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
49a72dfb 742static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
b71d1d42
ED		 743 const struct in6_addr *daddr,
744 const struct in6_addr *saddr, int nbytes)
cfb6eeb4 745{
cfb6eeb4 746 struct tcp6_pseudohdr *bp;
49a72dfb 747 struct scatterlist sg;
8d26d76d 748
cfb6eeb4 749 bp = &hp->md5_blk.ip6;
cfb6eeb4 750 /* 1. TCP pseudo-header (RFC2460) */
4e3fd7a0
AD		 751 bp->saddr = *saddr;
752 bp->daddr = *daddr;
49a72dfb 753 bp->protocol = cpu_to_be32(IPPROTO_TCP);
00b1304c 754 bp->len = cpu_to_be32(nbytes);
cfb6eeb4 755
49a72dfb
AL		 756 sg_init_one(&sg, bp, sizeof(*bp));
757 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
758}
c7da57a1 759
49a72dfb 760static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
b71d1d42 761 const struct in6_addr *daddr, struct in6_addr *saddr,
318cf7aa 762 const struct tcphdr *th)
49a72dfb
AL		 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))
cfb6eeb4 781 goto clear_hash;
cfb6eeb4 782
cfb6eeb4 783 tcp_put_md5sig_pool();
cfb6eeb4 784 return 0;
49a72dfb 785
cfb6eeb4
YH		 786clear_hash:
787 tcp_put_md5sig_pool();
788clear_hash_noput:
789 memset(md5_hash, 0, 16);
49a72dfb 790 return 1;
cfb6eeb4
YH		 791}
792
49a72dfb 793static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
318cf7aa
ED		 794 const struct sock *sk,
795 const struct request_sock *req,
796 const struct sk_buff *skb)
cfb6eeb4 797{
b71d1d42 798 const struct in6_addr *saddr, *daddr;
49a72dfb
AL		 799 struct tcp_md5sig_pool *hp;
800 struct hash_desc *desc;
318cf7aa 801 const struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4
YH		 802
803 if (sk) {
804 saddr = &inet6_sk(sk)->saddr;
805 daddr = &inet6_sk(sk)->daddr;
49a72dfb 806 } else if (req) {
cfb6eeb4
YH		 807 saddr = &inet6_rsk(req)->loc_addr;
808 daddr = &inet6_rsk(req)->rmt_addr;
49a72dfb 809 } else {
b71d1d42 810 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
49a72dfb
AL		 811 saddr = &ip6h->saddr;
812 daddr = &ip6h->daddr;
cfb6eeb4 813 }
49a72dfb
AL		 814
815 hp = tcp_get_md5sig_pool();
816 if (!hp)
817 goto clear_hash_noput;
818 desc = &hp->md5_desc;
819
820 if (crypto_hash_init(desc))
821 goto clear_hash;
822
823 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
824 goto clear_hash;
825 if (tcp_md5_hash_header(hp, th))
826 goto clear_hash;
827 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
828 goto clear_hash;
829 if (tcp_md5_hash_key(hp, key))
830 goto clear_hash;
831 if (crypto_hash_final(desc, md5_hash))
832 goto clear_hash;
833
834 tcp_put_md5sig_pool();
835 return 0;
836
837clear_hash:
838 tcp_put_md5sig_pool();
839clear_hash_noput:
840 memset(md5_hash, 0, 16);
841 return 1;
cfb6eeb4
YH		 842}
843
318cf7aa 844static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb)
cfb6eeb4 845{
cf533ea5 846 const __u8 *hash_location = NULL;
cfb6eeb4 847 struct tcp_md5sig_key *hash_expected;
b71d1d42 848 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
318cf7aa 849 const struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4 850 int genhash;
cfb6eeb4
YH		 851 u8 newhash[16];
852
853 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
7d5d5525 854 hash_location = tcp_parse_md5sig_option(th);
cfb6eeb4 855
785957d3
DM		 856 /* We've parsed the options - do we have a hash? */
857 if (!hash_expected && !hash_location)
858 return 0;
859
860 if (hash_expected && !hash_location) {
861 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
cfb6eeb4
YH		 862 return 1;
863 }
864
785957d3
DM		 865 if (!hash_expected && hash_location) {
866 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
cfb6eeb4
YH		 867 return 1;
868 }
869
870 /* check the signature */
49a72dfb
AL		 871 genhash = tcp_v6_md5_hash_skb(newhash,
872 hash_expected,
873 NULL, NULL, skb);
874
cfb6eeb4
YH		 875 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
876 if (net_ratelimit()) {
5856b606 877 printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
cfb6eeb4 878 genhash ? "failed" : "mismatch",
0c6ce78a
HH		 879 &ip6h->saddr, ntohs(th->source),
880 &ip6h->daddr, ntohs(th->dest));
cfb6eeb4
YH		 881 }
882 return 1;
883 }
884 return 0;
885}
886#endif
887
c6aefafb 888struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
1da177e4 889 .family = AF_INET6,
2e6599cb 890 .obj_size = sizeof(struct tcp6_request_sock),
72659ecc 891 .rtx_syn_ack = tcp_v6_rtx_synack,
60236fdd
ACM		 892 .send_ack = tcp_v6_reqsk_send_ack,
893 .destructor = tcp_v6_reqsk_destructor,
72659ecc
OP		 894 .send_reset = tcp_v6_send_reset,
895 .syn_ack_timeout = tcp_syn_ack_timeout,
1da177e4
LT		 896};
897
cfb6eeb4 898#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 899static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
cfb6eeb4 900 .md5_lookup = tcp_v6_reqsk_md5_lookup,
e3afe7b7 901 .calc_md5_hash = tcp_v6_md5_hash_skb,
cfb6eeb4 902};
b6332e6c 903#endif
cfb6eeb4 904
8ad50d96 905static void __tcp_v6_send_check(struct sk_buff *skb,
b71d1d42 906 const struct in6_addr *saddr, const struct in6_addr *daddr)
1da177e4 907{
aa8223c7 908 struct tcphdr *th = tcp_hdr(skb);
1da177e4 909
84fa7933 910 if (skb->ip_summed == CHECKSUM_PARTIAL) {
8ad50d96 911 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
663ead3b 912 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 913 skb->csum_offset = offsetof(struct tcphdr, check);
1da177e4 914 } else {
8ad50d96
HX		 915 th->check = tcp_v6_check(skb->len, saddr, daddr,
916 csum_partial(th, th->doff << 2,
917 skb->csum));
1da177e4
LT		 918 }
919}
920
bb296246 921static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
8ad50d96
HX		 922{
923 struct ipv6_pinfo *np = inet6_sk(sk);
924
925 __tcp_v6_send_check(skb, &np->saddr, &np->daddr);
926}
927
a430a43d
HX		 928static int tcp_v6_gso_send_check(struct sk_buff *skb)
929{
b71d1d42 930 const struct ipv6hdr *ipv6h;
a430a43d
HX		 931 struct tcphdr *th;
932
933 if (!pskb_may_pull(skb, sizeof(*th)))
934 return -EINVAL;
935
0660e03f 936 ipv6h = ipv6_hdr(skb);
aa8223c7 937 th = tcp_hdr(skb);
a430a43d
HX		 938
939 th->check = 0;
84fa7933 940 skb->ip_summed = CHECKSUM_PARTIAL;
8ad50d96 941 __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
a430a43d
HX		 942 return 0;
943}
1da177e4 944
36990673
HX		 945static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
946 struct sk_buff *skb)
684f2176 947{
b71d1d42 948 const struct ipv6hdr *iph = skb_gro_network_header(skb);
684f2176
HX		 949
950 switch (skb->ip_summed) {
951 case CHECKSUM_COMPLETE:
86911732 952 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
684f2176
HX		 953 skb->csum)) {
954 skb->ip_summed = CHECKSUM_UNNECESSARY;
955 break;
956 }
957
958 /* fall through */
959 case CHECKSUM_NONE:
960 NAPI_GRO_CB(skb)->flush = 1;
961 return NULL;
962 }
963
964 return tcp_gro_receive(head, skb);
965}
684f2176 966
36990673 967static int tcp6_gro_complete(struct sk_buff *skb)
684f2176 968{
b71d1d42 969 const struct ipv6hdr *iph = ipv6_hdr(skb);
684f2176
HX		 970 struct tcphdr *th = tcp_hdr(skb);
971
972 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
973 &iph->saddr, &iph->daddr, 0);
974 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
975
976 return tcp_gro_complete(skb);
977}
684f2176 978
626e264d 979static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
b903d324 980 u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass)
1da177e4 981{
cf533ea5
ED		 982 const struct tcphdr *th = tcp_hdr(skb);
983 struct tcphdr *t1;
1da177e4 984 struct sk_buff *buff;
4c9483b2 985 struct flowi6 fl6;
adf30907 986 struct net *net = dev_net(skb_dst(skb)->dev);
e5047992 987 struct sock *ctl_sk = net->ipv6.tcp_sk;
77c676da 988 unsigned int tot_len = sizeof(struct tcphdr);
adf30907 989 struct dst_entry *dst;
81ada62d 990 __be32 *topt;
1da177e4 991
626e264d
IJ		 992 if (ts)
993 tot_len += TCPOLEN_TSTAMP_ALIGNED;
cfb6eeb4 994#ifdef CONFIG_TCP_MD5SIG
cfb6eeb4
YH		 995 if (key)
996 tot_len += TCPOLEN_MD5SIG_ALIGNED;
997#endif
998
cfb6eeb4 999 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1da177e4 1000 GFP_ATOMIC);
1ab1457c
YH		 1001 if (buff == NULL)
1002 return;
1da177e4 1003
cfb6eeb4 1004 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1da177e4 1005
cfb6eeb4 1006 t1 = (struct tcphdr *) skb_push(buff, tot_len);
6651ffc8 1007 skb_reset_transport_header(buff);
1da177e4
LT		 1008
1009 /* Swap the send and the receive. */
1010 memset(t1, 0, sizeof(*t1));
1011 t1->dest = th->source;
1012 t1->source = th->dest;
cfb6eeb4 1013 t1->doff = tot_len / 4;
626e264d
IJ		 1014 t1->seq = htonl(seq);
1015 t1->ack_seq = htonl(ack);
1016 t1->ack = !rst || !th->ack;
1017 t1->rst = rst;
1018 t1->window = htons(win);
1da177e4 1019
81ada62d
IJ		 1020 topt = (__be32 *)(t1 + 1);
1021
626e264d
IJ		 1022 if (ts) {
1023 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1024 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1025 *topt++ = htonl(tcp_time_stamp);
1026 *topt++ = htonl(ts);
1027 }
1028
cfb6eeb4
YH		 1029#ifdef CONFIG_TCP_MD5SIG
1030 if (key) {
81ada62d
IJ		 1031 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1032 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1033 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
78e645cb
IJ		 1034 &ipv6_hdr(skb)->saddr,
1035 &ipv6_hdr(skb)->daddr, t1);
cfb6eeb4
YH		 1036 }
1037#endif
1038
4c9483b2 1039 memset(&fl6, 0, sizeof(fl6));
4e3fd7a0
AD		 1040 fl6.daddr = ipv6_hdr(skb)->saddr;
1041 fl6.saddr = ipv6_hdr(skb)->daddr;
1da177e4 1042
e5700aff
DM		 1043 buff->ip_summed = CHECKSUM_PARTIAL;
1044 buff->csum = 0;
1045
4c9483b2 1046 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
1da177e4 1047
4c9483b2
DM		 1048 fl6.flowi6_proto = IPPROTO_TCP;
1049 fl6.flowi6_oif = inet6_iif(skb);
1958b856
DM		 1050 fl6.fl6_dport = t1->dest;
1051 fl6.fl6_sport = t1->source;
4c9483b2 1052 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
1da177e4 1053
c20121ae
DL		 1054 /* Pass a socket to ip6_dst_lookup either it is for RST
1055 * Underlying function will use this to retrieve the network
1056 * namespace
1057 */
4c9483b2 1058 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
68d0c6d3
DM		 1059 if (!IS_ERR(dst)) {
1060 skb_dst_set(buff, dst);
b903d324 1061 ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass);
68d0c6d3
DM		 1062 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1063 if (rst)
1064 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1065 return;
1da177e4
LT		 1066 }
1067
1068 kfree_skb(buff);
1069}
1070
626e264d 1071static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1da177e4 1072{
cf533ea5 1073 const struct tcphdr *th = tcp_hdr(skb);
626e264d 1074 u32 seq = 0, ack_seq = 0;
fa3e5b4e 1075 struct tcp_md5sig_key *key = NULL;
1da177e4 1076
626e264d 1077 if (th->rst)
1da177e4
LT		 1078 return;
1079
626e264d
IJ		 1080 if (!ipv6_unicast_destination(skb))
1081 return;
1da177e4 1082
cfb6eeb4 1083#ifdef CONFIG_TCP_MD5SIG
626e264d
IJ		 1084 if (sk)
1085 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
cfb6eeb4
YH		 1086#endif
1087
626e264d
IJ		 1088 if (th->ack)
1089 seq = ntohl(th->ack_seq);
1090 else
1091 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
1092 (th->doff << 2);
1da177e4 1093
b903d324 1094 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0);
626e264d 1095}
1da177e4 1096
626e264d 1097static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
b903d324 1098 struct tcp_md5sig_key *key, u8 tclass)
626e264d 1099{
b903d324 1100 tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass);
1da177e4
LT		 1101}
1102
1103static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1104{
8feaf0c0 1105 struct inet_timewait_sock *tw = inet_twsk(sk);
cfb6eeb4 1106 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1da177e4 1107
9501f972 1108 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
8feaf0c0 1109 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
b903d324
ED		 1110 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw),
1111 tw->tw_tclass);
1da177e4 1112
8feaf0c0 1113 inet_twsk_put(tw);
1da177e4
LT		 1114}
1115
6edafaaf
GJ		 1116static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
1117 struct request_sock *req)
1da177e4 1118{
9501f972 1119 tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent,
b903d324 1120 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0);
1da177e4
LT		 1121}
1122
1123
1124static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
1125{
60236fdd 1126 struct request_sock *req, **prev;
aa8223c7 1127 const struct tcphdr *th = tcp_hdr(skb);
1da177e4
LT		 1128 struct sock *nsk;
1129
1130 /* Find possible connection requests. */
8129765a 1131 req = inet6_csk_search_req(sk, &prev, th->source,
0660e03f
ACM		 1132 &ipv6_hdr(skb)->saddr,
1133 &ipv6_hdr(skb)->daddr, inet6_iif(skb));
1da177e4
LT		 1134 if (req)
1135 return tcp_check_req(sk, skb, req, prev);
1136
3b1e0a65 1137 nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
d86e0dac
PE		 1138 &ipv6_hdr(skb)->saddr, th->source,
1139 &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb));
1da177e4
LT		 1140
1141 if (nsk) {
1142 if (nsk->sk_state != TCP_TIME_WAIT) {
1143 bh_lock_sock(nsk);
1144 return nsk;
1145 }
9469c7b4 1146 inet_twsk_put(inet_twsk(nsk));
1da177e4
LT		 1147 return NULL;
1148 }
1149
c6aefafb 1150#ifdef CONFIG_SYN_COOKIES
af9b4738 1151 if (!th->syn)
c6aefafb 1152 sk = cookie_v6_check(sk, skb);
1da177e4
LT		 1153#endif
1154 return sk;
1155}
1156
1da177e4
LT		 1157/* FIXME: this is substantially similar to the ipv4 code.
1158 * Can some kind of merge be done? -- erics
1159 */
1160static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
1161{
4957faad 1162 struct tcp_extend_values tmp_ext;
e6b4d113 1163 struct tcp_options_received tmp_opt;
cf533ea5 1164 const u8 *hash_location;
e6b4d113 1165 struct request_sock *req;
ca304b61 1166 struct inet6_request_sock *treq;
1da177e4 1167 struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4 1168 struct tcp_sock *tp = tcp_sk(sk);
e6b4d113 1169 __u32 isn = TCP_SKB_CB(skb)->when;
493f377d 1170 struct dst_entry *dst = NULL;
c6aefafb 1171 int want_cookie = 0;
1da177e4
LT		 1172
1173 if (skb->protocol == htons(ETH_P_IP))
1174 return tcp_v4_conn_request(sk, skb);
1175
1176 if (!ipv6_unicast_destination(skb))
1ab1457c 1177 goto drop;
1da177e4 1178
463c84b9 1179 if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
946cedcc
ED		 1180 want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
1181 if (!want_cookie)
1182 goto drop;
1da177e4
LT		 1183 }
1184
463c84b9 1185 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
1da177e4
LT		 1186 goto drop;
1187
ca304b61 1188 req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
1da177e4
LT		 1189 if (req == NULL)
1190 goto drop;
1191
cfb6eeb4
YH		 1192#ifdef CONFIG_TCP_MD5SIG
1193 tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
1194#endif
1195
1da177e4
LT		 1196 tcp_clear_options(&tmp_opt);
1197 tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
1198 tmp_opt.user_mss = tp->rx_opt.user_mss;
bb5b7c11 1199 tcp_parse_options(skb, &tmp_opt, &hash_location, 0);
4957faad
WAS		 1200
1201 if (tmp_opt.cookie_plus > 0 &&
1202 tmp_opt.saw_tstamp &&
1203 !tp->rx_opt.cookie_out_never &&
1204 (sysctl_tcp_cookie_size > 0 ||
1205 (tp->cookie_values != NULL &&
1206 tp->cookie_values->cookie_desired > 0))) {
1207 u8 *c;
1208 u32 *d;
1209 u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS];
1210 int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE;
1211
1212 if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0)
1213 goto drop_and_free;
1214
1215 /* Secret recipe starts with IP addresses */
0eae88f3 1216 d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0];
4957faad
WAS		 1217 *mess++ ^= *d++;
1218 *mess++ ^= *d++;
1219 *mess++ ^= *d++;
1220 *mess++ ^= *d++;
0eae88f3 1221 d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0];
4957faad
WAS		 1222 *mess++ ^= *d++;
1223 *mess++ ^= *d++;
1224 *mess++ ^= *d++;
1225 *mess++ ^= *d++;
1226
1227 /* plus variable length Initiator Cookie */
1228 c = (u8 *)mess;
1229 while (l-- > 0)
1230 *c++ ^= *hash_location++;
1da177e4 1231
4957faad 1232 want_cookie = 0; /* not our kind of cookie */
4957faad
WAS		 1233 tmp_ext.cookie_out_never = 0; /* false */
1234 tmp_ext.cookie_plus = tmp_opt.cookie_plus;
1235 } else if (!tp->rx_opt.cookie_in_always) {
1236 /* redundant indications, but ensure initialization. */
1237 tmp_ext.cookie_out_never = 1; /* true */
1238 tmp_ext.cookie_plus = 0;
1239 } else {
1240 goto drop_and_free;
1241 }
1242 tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always;
1da177e4 1243
4dfc2817 1244 if (want_cookie && !tmp_opt.saw_tstamp)
c6aefafb 1245 tcp_clear_options(&tmp_opt);
c6aefafb 1246
1da177e4
LT		 1247 tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
1248 tcp_openreq_init(req, &tmp_opt, skb);
1249
ca304b61 1250 treq = inet6_rsk(req);
4e3fd7a0
AD		 1251 treq->rmt_addr = ipv6_hdr(skb)->saddr;
1252 treq->loc_addr = ipv6_hdr(skb)->daddr;
172d69e6 1253 if (!want_cookie || tmp_opt.tstamp_ok)
c6aefafb
GG		 1254 TCP_ECN_create_request(req, tcp_hdr(skb));
1255
4d0fe50c
ED		 1256 treq->iif = sk->sk_bound_dev_if;
1257
1258 /* So that link locals have meaning */
1259 if (!sk->sk_bound_dev_if &&
1260 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1261 treq->iif = inet6_iif(skb);
1262
2bbdf389 1263 if (!isn) {
493f377d
DM		 1264 struct inet_peer *peer = NULL;
1265
c6aefafb
GG		 1266 if (ipv6_opt_accepted(sk, skb) ||
1267 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1268 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1269 atomic_inc(&skb->users);
1270 treq->pktopts = skb;
1271 }
493f377d
DM		 1272
1273 if (want_cookie) {
2bbdf389
FW		 1274 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1275 req->cookie_ts = tmp_opt.tstamp_ok;
493f377d
DM		 1276 goto have_isn;
1277 }
1278
1279 /* VJ's idea. We save last timestamp seen
1280 * from the destination in peer table, when entering
1281 * state TIME-WAIT, and check against it before
1282 * accepting new connection request.
1283 *
1284 * If "isn" is not zero, this request hit alive
1285 * timewait bucket, so that all the necessary checks
1286 * are made in the function processing timewait state.
1287 */
1288 if (tmp_opt.saw_tstamp &&
1289 tcp_death_row.sysctl_tw_recycle &&
1290 (dst = inet6_csk_route_req(sk, req)) != NULL &&
1291 (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
7a71ed89 1292 ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
493f377d
DM		 1293 &treq->rmt_addr)) {
1294 inet_peer_refcheck(peer);
1295 if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
1296 (s32)(peer->tcp_ts - req->ts_recent) >
1297 TCP_PAWS_WINDOW) {
1298 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
1299 goto drop_and_release;
1300 }
1301 }
1302 /* Kill the following clause, if you dislike this way. */
1303 else if (!sysctl_tcp_syncookies &&
1304 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
1305 (sysctl_max_syn_backlog >> 2)) &&
1306 (!peer || !peer->tcp_ts_stamp) &&
1307 (!dst || !dst_metric(dst, RTAX_RTT))) {
1308 /* Without syncookies last quarter of
1309 * backlog is filled with destinations,
1310 * proven to be alive.
1311 * It means that we continue to communicate
1312 * to destinations, already remembered
1313 * to the moment of synflood.
1314 */
1315 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
1316 &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
1317 goto drop_and_release;
2bbdf389 1318 }
493f377d
DM		 1319
1320 isn = tcp_v6_init_sequence(skb);
c6aefafb 1321 }
493f377d 1322have_isn:
2e6599cb 1323 tcp_rsk(req)->snt_isn = isn;
9ad7c049 1324 tcp_rsk(req)->snt_synack = tcp_time_stamp;
1da177e4 1325
4237c75c
VY		 1326 security_inet_conn_request(sk, skb, req);
1327
4957faad
WAS		 1328 if (tcp_v6_send_synack(sk, req,
1329 (struct request_values *)&tmp_ext) ||
1330 want_cookie)
e6b4d113 1331 goto drop_and_free;
1da177e4 1332
e6b4d113
WAS		 1333 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1334 return 0;
1da177e4 1335
493f377d
DM		 1336drop_and_release:
1337 dst_release(dst);
e6b4d113
WAS		 1338drop_and_free:
1339 reqsk_free(req);
1da177e4 1340drop:
1da177e4
LT		 1341 return 0; /* don't send reset */
1342}
1343
1344static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
60236fdd 1345 struct request_sock *req,
1da177e4
LT		 1346 struct dst_entry *dst)
1347{
78d15e82 1348 struct inet6_request_sock *treq;
1da177e4
LT		 1349 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1350 struct tcp6_sock *newtcp6sk;
1351 struct inet_sock *newinet;
1352 struct tcp_sock *newtp;
1353 struct sock *newsk;
1354 struct ipv6_txoptions *opt;
cfb6eeb4
YH		 1355#ifdef CONFIG_TCP_MD5SIG
1356 struct tcp_md5sig_key *key;
1357#endif
1da177e4
LT		 1358
1359 if (skb->protocol == htons(ETH_P_IP)) {
1360 /*
1361 * v6 mapped
1362 */
1363
1364 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1365
1ab1457c 1366 if (newsk == NULL)
1da177e4
LT		 1367 return NULL;
1368
1369 newtcp6sk = (struct tcp6_sock *)newsk;
1370 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1371
1372 newinet = inet_sk(newsk);
1373 newnp = inet6_sk(newsk);
1374 newtp = tcp_sk(newsk);
1375
1376 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1377
c720c7e8 1378 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
1da177e4 1379
c720c7e8 1380 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
1da177e4 1381
4e3fd7a0 1382 newnp->rcv_saddr = newnp->saddr;
1da177e4 1383
8292a17a 1384 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1da177e4 1385 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 1386#ifdef CONFIG_TCP_MD5SIG
1387 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1388#endif
1389
676a1184
YZ		 1390 newnp->ipv6_ac_list = NULL;
1391 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1392 newnp->pktoptions = NULL;
1393 newnp->opt = NULL;
505cbfc5 1394 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1395 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4 1396
e6848976
ACM		 1397 /*
1398 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1399 * here, tcp_create_openreq_child now does this for us, see the comment in
1400 * that function for the gory details. -acme
1da177e4 1401 */
1da177e4
LT		 1402
1403 /* It is tricky place. Until this moment IPv4 tcp
8292a17a 1404 worked with IPv6 icsk.icsk_af_ops.
1da177e4
LT		 1405 Sync it now.
1406 */
d83d8461 1407 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1da177e4
LT		 1408
1409 return newsk;
1410 }
1411
78d15e82 1412 treq = inet6_rsk(req);
1da177e4
LT		 1413 opt = np->opt;
1414
1415 if (sk_acceptq_is_full(sk))
1416 goto out_overflow;
1417
493f377d
DM		 1418 if (!dst) {
1419 dst = inet6_csk_route_req(sk, req);
1420 if (!dst)
1da177e4 1421 goto out;
1ab1457c 1422 }
1da177e4
LT		 1423
1424 newsk = tcp_create_openreq_child(sk, req, skb);
1425 if (newsk == NULL)
093d2823 1426 goto out_nonewsk;
1da177e4 1427
e6848976
ACM		 1428 /*
1429 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1430 * count here, tcp_create_openreq_child now does this for us, see the
1431 * comment in that function for the gory details. -acme
1432 */
1da177e4 1433
59eed279 1434 newsk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 1435 __ip6_dst_store(newsk, dst, NULL, NULL);
1da177e4
LT		 1436
1437 newtcp6sk = (struct tcp6_sock *)newsk;
1438 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1439
1440 newtp = tcp_sk(newsk);
1441 newinet = inet_sk(newsk);
1442 newnp = inet6_sk(newsk);
1443
1444 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1445
4e3fd7a0
AD		 1446 newnp->daddr = treq->rmt_addr;
1447 newnp->saddr = treq->loc_addr;
1448 newnp->rcv_saddr = treq->loc_addr;
2e6599cb 1449 newsk->sk_bound_dev_if = treq->iif;
1da177e4 1450
1ab1457c 1451 /* Now IPv6 options...
1da177e4
LT		 1452
1453 First: no IPv4 options.
1454 */
f6d8bd05 1455 newinet->inet_opt = NULL;
676a1184 1456 newnp->ipv6_ac_list = NULL;
d35690be 1457 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1458
1459 /* Clone RX bits */
1460 newnp->rxopt.all = np->rxopt.all;
1461
1462 /* Clone pktoptions received with SYN */
1463 newnp->pktoptions = NULL;
2e6599cb
ACM		 1464 if (treq->pktopts != NULL) {
1465 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1466 kfree_skb(treq->pktopts);
1467 treq->pktopts = NULL;
1da177e4
LT		 1468 if (newnp->pktoptions)
1469 skb_set_owner_r(newnp->pktoptions, newsk);
1470 }
1471 newnp->opt = NULL;
505cbfc5 1472 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1473 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4
LT		 1474
1475 /* Clone native IPv6 options from listening socket (if any)
1476
1477 Yes, keeping reference count would be much more clever,
1478 but we make one more one thing there: reattach optmem
1479 to newsk.
1480 */
1481 if (opt) {
1482 newnp->opt = ipv6_dup_options(newsk, opt);
1483 if (opt != np->opt)
1484 sock_kfree_s(sk, opt, opt->tot_len);
1485 }
1486
d83d8461 1487 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1da177e4 1488 if (newnp->opt)
d83d8461
ACM		 1489 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1490 newnp->opt->opt_flen);
1da177e4 1491
5d424d5a 1492 tcp_mtup_init(newsk);
1da177e4 1493 tcp_sync_mss(newsk, dst_mtu(dst));
0dbaee3b 1494 newtp->advmss = dst_metric_advmss(dst);
1da177e4 1495 tcp_initialize_rcv_mss(newsk);
9ad7c049
JC		 1496 if (tcp_rsk(req)->snt_synack)
1497 tcp_valid_rtt_meas(newsk,
1498 tcp_time_stamp - tcp_rsk(req)->snt_synack);
1499 newtp->total_retrans = req->retrans;
1da177e4 1500
c720c7e8
ED		 1501 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1502 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1da177e4 1503
cfb6eeb4
YH		 1504#ifdef CONFIG_TCP_MD5SIG
1505 /* Copy over the MD5 key from the original socket */
1506 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1507 /* We're using one, so create a matching key
1508 * on the newsk structure. If we fail to get
1509 * memory, then we end up not copying the key
1510 * across. Shucks.
1511 */
af879cc7
ACM		 1512 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1513 if (newkey != NULL)
e547bc1e 1514 tcp_v6_md5_do_add(newsk, &newnp->daddr,
cfb6eeb4 1515 newkey, key->keylen);
cfb6eeb4
YH		 1516 }
1517#endif
1518
093d2823
BS		 1519 if (__inet_inherit_port(sk, newsk) < 0) {
1520 sock_put(newsk);
1521 goto out;
1522 }
9327f705 1523 __inet6_hash(newsk, NULL);
1da177e4
LT		 1524
1525 return newsk;
1526
1527out_overflow:
de0744af 1528 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
093d2823 1529out_nonewsk:
1da177e4
LT		 1530 if (opt && opt != np->opt)
1531 sock_kfree_s(sk, opt, opt->tot_len);
1532 dst_release(dst);
093d2823
BS		 1533out:
1534 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1da177e4
LT		 1535 return NULL;
1536}
1537
b51655b9 1538static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1da177e4 1539{
84fa7933 1540 if (skb->ip_summed == CHECKSUM_COMPLETE) {
684f2176 1541 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
0660e03f 1542 &ipv6_hdr(skb)->daddr, skb->csum)) {
fb286bb2 1543 skb->ip_summed = CHECKSUM_UNNECESSARY;
1da177e4 1544 return 0;
fb286bb2 1545 }
1da177e4 1546 }
fb286bb2 1547
684f2176 1548 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
0660e03f
ACM		 1549 &ipv6_hdr(skb)->saddr,
1550 &ipv6_hdr(skb)->daddr, 0));
fb286bb2 1551
1da177e4 1552 if (skb->len <= 76) {
fb286bb2 1553 return __skb_checksum_complete(skb);
1da177e4
LT		 1554 }
1555 return 0;
1556}
1557
1558/* The socket must have it's spinlock held when we get
1559 * here.
1560 *
1561 * We have a potential double-lock case here, so even when
1562 * doing backlog processing we use the BH locking scheme.
1563 * This is because we cannot sleep with the original spinlock
1564 * held.
1565 */
1566static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1567{
1568 struct ipv6_pinfo *np = inet6_sk(sk);
1569 struct tcp_sock *tp;
1570 struct sk_buff *opt_skb = NULL;
1571
1572 /* Imagine: socket is IPv6. IPv4 packet arrives,
1573 goes to IPv4 receive handler and backlogged.
1574 From backlog it always goes here. Kerboom...
1575 Fortunately, tcp_rcv_established and rcv_established
1576 handle them correctly, but it is not case with
1577 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1578 */
1579
1580 if (skb->protocol == htons(ETH_P_IP))
1581 return tcp_v4_do_rcv(sk, skb);
1582
cfb6eeb4
YH		 1583#ifdef CONFIG_TCP_MD5SIG
1584 if (tcp_v6_inbound_md5_hash (sk, skb))
1585 goto discard;
1586#endif
1587
fda9ef5d 1588 if (sk_filter(sk, skb))
1da177e4
LT		 1589 goto discard;
1590
1591 /*
1592 * socket locking is here for SMP purposes as backlog rcv
1593 * is currently called with bh processing disabled.
1594 */
1595
1596 /* Do Stevens' IPV6_PKTOPTIONS.
1597
1598 Yes, guys, it is the only place in our code, where we
1599 may make it not affecting IPv4.
1600 The rest of code is protocol independent,
1601 and I do not like idea to uglify IPv4.
1602
1603 Actually, all the idea behind IPV6_PKTOPTIONS
1604 looks not very well thought. For now we latch
1605 options, received in the last packet, enqueued
1606 by tcp. Feel free to propose better solution.
1ab1457c 1607 --ANK (980728)
1da177e4
LT		 1608 */
1609 if (np->rxopt.all)
1610 opt_skb = skb_clone(skb, GFP_ATOMIC);
1611
1612 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
bdeab991 1613 sock_rps_save_rxhash(sk, skb);
aa8223c7 1614 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1da177e4 1615 goto reset;
1da177e4
LT		 1616 if (opt_skb)
1617 goto ipv6_pktoptions;
1618 return 0;
1619 }
1620
ab6a5bb6 1621 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1da177e4
LT		 1622 goto csum_err;
1623
1ab1457c 1624 if (sk->sk_state == TCP_LISTEN) {
1da177e4
LT		 1625 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1626 if (!nsk)
1627 goto discard;
1628
1629 /*
1630 * Queue it on the new socket if the new socket is active,
1631 * otherwise we just shortcircuit this and continue with
1632 * the new socket..
1633 */
1ab1457c 1634 if(nsk != sk) {
bdeab991 1635 sock_rps_save_rxhash(nsk, skb);
1da177e4
LT		 1636 if (tcp_child_process(sk, nsk, skb))
1637 goto reset;
1638 if (opt_skb)
1639 __kfree_skb(opt_skb);
1640 return 0;
1641 }
47482f13 1642 } else
bdeab991 1643 sock_rps_save_rxhash(sk, skb);
1da177e4 1644
aa8223c7 1645 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1da177e4 1646 goto reset;
1da177e4
LT		 1647 if (opt_skb)
1648 goto ipv6_pktoptions;
1649 return 0;
1650
1651reset:
cfb6eeb4 1652 tcp_v6_send_reset(sk, skb);
1da177e4
LT		 1653discard:
1654 if (opt_skb)
1655 __kfree_skb(opt_skb);
1656 kfree_skb(skb);
1657 return 0;
1658csum_err:
63231bdd 1659 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1da177e4
LT		 1660 goto discard;
1661
1662
1663ipv6_pktoptions:
1664 /* Do you ask, what is it?
1665
1666 1. skb was enqueued by tcp.
1667 2. skb is added to tail of read queue, rather than out of order.
1668 3. socket is not in passive state.
1669 4. Finally, it really contains options, which user wants to receive.
1670 */
1671 tp = tcp_sk(sk);
1672 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1673 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
333fad53 1674 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
505cbfc5 1675 np->mcast_oif = inet6_iif(opt_skb);
333fad53 1676 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
0660e03f 1677 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1da177e4
LT		 1678 if (ipv6_opt_accepted(sk, opt_skb)) {
1679 skb_set_owner_r(opt_skb, sk);
1680 opt_skb = xchg(&np->pktoptions, opt_skb);
1681 } else {
1682 __kfree_skb(opt_skb);
1683 opt_skb = xchg(&np->pktoptions, NULL);
1684 }
1685 }
1686
800d55f1 1687 kfree_skb(opt_skb);
1da177e4
LT		 1688 return 0;
1689}
1690
e5bbef20 1691static int tcp_v6_rcv(struct sk_buff *skb)
1da177e4 1692{
cf533ea5 1693 const struct tcphdr *th;
b71d1d42 1694 const struct ipv6hdr *hdr;
1da177e4
LT		 1695 struct sock *sk;
1696 int ret;
a86b1e30 1697 struct net *net = dev_net(skb->dev);
1da177e4
LT		 1698
1699 if (skb->pkt_type != PACKET_HOST)
1700 goto discard_it;
1701
1702 /*
1703 * Count it even if it's bad.
1704 */
63231bdd 1705 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1da177e4
LT		 1706
1707 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1708 goto discard_it;
1709
aa8223c7 1710 th = tcp_hdr(skb);
1da177e4
LT		 1711
1712 if (th->doff < sizeof(struct tcphdr)/4)
1713 goto bad_packet;
1714 if (!pskb_may_pull(skb, th->doff*4))
1715 goto discard_it;
1716
60476372 1717 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1da177e4
LT		 1718 goto bad_packet;
1719
aa8223c7 1720 th = tcp_hdr(skb);
e802af9c 1721 hdr = ipv6_hdr(skb);
1da177e4
LT		 1722 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1723 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1724 skb->len - th->doff*4);
1725 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1726 TCP_SKB_CB(skb)->when = 0;
b82d1bb4 1727 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1da177e4
LT		 1728 TCP_SKB_CB(skb)->sacked = 0;
1729
9a1f27c4 1730 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1da177e4
LT		 1731 if (!sk)
1732 goto no_tcp_socket;
1733
1734process:
1735 if (sk->sk_state == TCP_TIME_WAIT)
1736 goto do_time_wait;
1737
e802af9c
SH		 1738 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1739 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1740 goto discard_and_relse;
1741 }
1742
1da177e4
LT		 1743 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1744 goto discard_and_relse;
1745
fda9ef5d 1746 if (sk_filter(sk, skb))
1da177e4
LT		 1747 goto discard_and_relse;
1748
1749 skb->dev = NULL;
1750
293b9c42 1751 bh_lock_sock_nested(sk);
1da177e4
LT		 1752 ret = 0;
1753 if (!sock_owned_by_user(sk)) {
1a2449a8 1754#ifdef CONFIG_NET_DMA
1ab1457c 1755 struct tcp_sock *tp = tcp_sk(sk);
b4caea8a 1756 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
f67b4599 1757 tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1ab1457c
YH		 1758 if (tp->ucopy.dma_chan)
1759 ret = tcp_v6_do_rcv(sk, skb);
1760 else
1a2449a8
CL		 1761#endif
1762 {
1763 if (!tcp_prequeue(sk, skb))
1764 ret = tcp_v6_do_rcv(sk, skb);
1765 }
6cce09f8 1766 } else if (unlikely(sk_add_backlog(sk, skb))) {
6b03a53a 1767 bh_unlock_sock(sk);
6cce09f8 1768 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
6b03a53a
ZY		 1769 goto discard_and_relse;
1770 }
1da177e4
LT		 1771 bh_unlock_sock(sk);
1772
1773 sock_put(sk);
1774 return ret ? -1 : 0;
1775
1776no_tcp_socket:
1777 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1778 goto discard_it;
1779
1780 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1781bad_packet:
63231bdd 1782 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1da177e4 1783 } else {
cfb6eeb4 1784 tcp_v6_send_reset(NULL, skb);
1da177e4
LT		 1785 }
1786
1787discard_it:
1788
1789 /*
1790 * Discard frame
1791 */
1792
1793 kfree_skb(skb);
1794 return 0;
1795
1796discard_and_relse:
1797 sock_put(sk);
1798 goto discard_it;
1799
1800do_time_wait:
1801 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
9469c7b4 1802 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1803 goto discard_it;
1804 }
1805
1806 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
63231bdd 1807 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
9469c7b4 1808 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1809 goto discard_it;
1810 }
1811
9469c7b4 1812 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1da177e4
LT		 1813 case TCP_TW_SYN:
1814 {
1815 struct sock *sk2;
1816
c346dca1 1817 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
0660e03f 1818 &ipv6_hdr(skb)->daddr,
505cbfc5 1819 ntohs(th->dest), inet6_iif(skb));
1da177e4 1820 if (sk2 != NULL) {
295ff7ed
ACM		 1821 struct inet_timewait_sock *tw = inet_twsk(sk);
1822 inet_twsk_deschedule(tw, &tcp_death_row);
1823 inet_twsk_put(tw);
1da177e4
LT		 1824 sk = sk2;
1825 goto process;
1826 }
1827 /* Fall through to ACK */
1828 }
1829 case TCP_TW_ACK:
1830 tcp_v6_timewait_ack(sk, skb);
1831 break;
1832 case TCP_TW_RST:
1833 goto no_tcp_socket;
1834 case TCP_TW_SUCCESS:;
1835 }
1836 goto discard_it;
1837}
1838
ccb7c410
DM		 1839static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
1840{
db3949c4
DM		 1841 struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk);
1842 struct ipv6_pinfo *np = inet6_sk(sk);
1843 struct inet_peer *peer;
1844
1845 if (!rt ||
1846 !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) {
1847 peer = inet_getpeer_v6(&np->daddr, 1);
1848 *release_it = true;
1849 } else {
1850 if (!rt->rt6i_peer)
1851 rt6_bind_peer(rt, 1);
1852 peer = rt->rt6i_peer;
457de438 1853 *release_it = false;
db3949c4
DM		 1854 }
1855
1856 return peer;
ccb7c410
DM		 1857}
1858
1859static void *tcp_v6_tw_get_peer(struct sock *sk)
1da177e4 1860{
cf533ea5
ED		 1861 const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
1862 const struct inet_timewait_sock *tw = inet_twsk(sk);
ccb7c410
DM		 1863
1864 if (tw->tw_family == AF_INET)
1865 return tcp_v4_tw_get_peer(sk);
1866
db3949c4 1867 return inet_getpeer_v6(&tw6->tw_v6_daddr, 1);
1da177e4
LT		 1868}
1869
ccb7c410
DM		 1870static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1871 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1872 .twsk_unique = tcp_twsk_unique,
1873 .twsk_destructor= tcp_twsk_destructor,
1874 .twsk_getpeer = tcp_v6_tw_get_peer,
1875};
1876
3b401a81 1877static const struct inet_connection_sock_af_ops ipv6_specific = {
543d9cfe
ACM		 1878 .queue_xmit = inet6_csk_xmit,
1879 .send_check = tcp_v6_send_check,
1880 .rebuild_header = inet6_sk_rebuild_header,
1881 .conn_request = tcp_v6_conn_request,
1882 .syn_recv_sock = tcp_v6_syn_recv_sock,
3f419d2d 1883 .get_peer = tcp_v6_get_peer,
543d9cfe
ACM		 1884 .net_header_len = sizeof(struct ipv6hdr),
1885 .setsockopt = ipv6_setsockopt,
1886 .getsockopt = ipv6_getsockopt,
1887 .addr2sockaddr = inet6_csk_addr2sockaddr,
1888 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1889 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1890#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1891 .compat_setsockopt = compat_ipv6_setsockopt,
1892 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1893#endif
1da177e4
LT		 1894};
1895
cfb6eeb4 1896#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 1897static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
cfb6eeb4 1898 .md5_lookup = tcp_v6_md5_lookup,
49a72dfb 1899 .calc_md5_hash = tcp_v6_md5_hash_skb,
cfb6eeb4
YH		 1900 .md5_add = tcp_v6_md5_add_func,
1901 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1902};
a928630a 1903#endif
cfb6eeb4 1904
1da177e4
LT		 1905/*
1906 * TCP over IPv4 via INET6 API
1907 */
1908
3b401a81 1909static const struct inet_connection_sock_af_ops ipv6_mapped = {
543d9cfe
ACM		 1910 .queue_xmit = ip_queue_xmit,
1911 .send_check = tcp_v4_send_check,
1912 .rebuild_header = inet_sk_rebuild_header,
1913 .conn_request = tcp_v6_conn_request,
1914 .syn_recv_sock = tcp_v6_syn_recv_sock,
3f419d2d 1915 .get_peer = tcp_v4_get_peer,
543d9cfe
ACM		 1916 .net_header_len = sizeof(struct iphdr),
1917 .setsockopt = ipv6_setsockopt,
1918 .getsockopt = ipv6_getsockopt,
1919 .addr2sockaddr = inet6_csk_addr2sockaddr,
1920 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1921 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1922#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1923 .compat_setsockopt = compat_ipv6_setsockopt,
1924 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1925#endif
1da177e4
LT		 1926};
1927
cfb6eeb4 1928#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 1929static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
cfb6eeb4 1930 .md5_lookup = tcp_v4_md5_lookup,
49a72dfb 1931 .calc_md5_hash = tcp_v4_md5_hash_skb,
cfb6eeb4
YH		 1932 .md5_add = tcp_v6_md5_add_func,
1933 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1934};
a928630a 1935#endif
cfb6eeb4 1936
1da177e4
LT		 1937/* NOTE: A lot of things set to zero explicitly by call to
1938 * sk_alloc() so need not be done here.
1939 */
1940static int tcp_v6_init_sock(struct sock *sk)
1941{
6687e988 1942 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 1943 struct tcp_sock *tp = tcp_sk(sk);
1944
1945 skb_queue_head_init(&tp->out_of_order_queue);
1946 tcp_init_xmit_timers(sk);
1947 tcp_prequeue_init(tp);
1948
6687e988 1949 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1da177e4
LT		 1950 tp->mdev = TCP_TIMEOUT_INIT;
1951
1952 /* So many TCP implementations out there (incorrectly) count the
1953 * initial SYN frame in their delayed-ACK and congestion control
1954 * algorithms that we must have the following bandaid to talk
1955 * efficiently to them. -DaveM
1956 */
1957 tp->snd_cwnd = 2;
1958
1959 /* See draft-stevens-tcpca-spec-01 for discussion of the
1960 * initialization of these values.
1961 */
0b6a05c1 1962 tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
1da177e4 1963 tp->snd_cwnd_clamp = ~0;
bee7ca9e 1964 tp->mss_cache = TCP_MSS_DEFAULT;
1da177e4
LT		 1965
1966 tp->reordering = sysctl_tcp_reordering;
1967
1968 sk->sk_state = TCP_CLOSE;
1969
8292a17a 1970 icsk->icsk_af_ops = &ipv6_specific;
6687e988 1971 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
d83d8461 1972 icsk->icsk_sync_mss = tcp_sync_mss;
1da177e4
LT		 1973 sk->sk_write_space = sk_stream_write_space;
1974 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1975
cfb6eeb4
YH		 1976#ifdef CONFIG_TCP_MD5SIG
1977 tp->af_specific = &tcp_sock_ipv6_specific;
1978#endif
1979
435cf559
WAS		 1980 /* TCP Cookie Transactions */
1981 if (sysctl_tcp_cookie_size > 0) {
1982 /* Default, cookies without s_data_payload. */
1983 tp->cookie_values =
1984 kzalloc(sizeof(*tp->cookie_values),
1985 sk->sk_allocation);
1986 if (tp->cookie_values != NULL)
1987 kref_init(&tp->cookie_values->kref);
1988 }
1989 /* Presumed zeroed, in order of appearance:
1990 * cookie_in_always, cookie_out_never,
1991 * s_data_constant, s_data_in, s_data_out
1992 */
1da177e4
LT		 1993 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1994 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1995
eb4dea58 1996 local_bh_disable();
180d8cd9 1997 sk_sockets_allocated_inc(sk);
eb4dea58 1998 local_bh_enable();
1da177e4
LT		 1999
2000 return 0;
2001}
2002
7d06b2e0 2003static void tcp_v6_destroy_sock(struct sock *sk)
1da177e4 2004{
cfb6eeb4
YH		 2005#ifdef CONFIG_TCP_MD5SIG
2006 /* Clean up the MD5 key list */
2007 if (tcp_sk(sk)->md5sig_info)
2008 tcp_v6_clear_md5_list(sk);
2009#endif
1da177e4 2010 tcp_v4_destroy_sock(sk);
7d06b2e0 2011 inet6_destroy_sock(sk);
1da177e4
LT		 2012}
2013
952a10be 2014#ifdef CONFIG_PROC_FS
1da177e4 2015/* Proc filesystem TCPv6 sock list dumping. */
1ab1457c 2016static void get_openreq6(struct seq_file *seq,
cf533ea5 2017 const struct sock *sk, struct request_sock *req, int i, int uid)
1da177e4 2018{
1da177e4 2019 int ttd = req->expires - jiffies;
b71d1d42
ED		 2020 const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
2021 const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1da177e4
LT		 2022
2023 if (ttd < 0)
2024 ttd = 0;
2025
1da177e4
LT		 2026 seq_printf(seq,
2027 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2028 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1da177e4
LT		 2029 i,
2030 src->s6_addr32[0], src->s6_addr32[1],
2031 src->s6_addr32[2], src->s6_addr32[3],
fd507037 2032 ntohs(inet_rsk(req)->loc_port),
1da177e4
LT		 2033 dest->s6_addr32[0], dest->s6_addr32[1],
2034 dest->s6_addr32[2], dest->s6_addr32[3],
2e6599cb 2035 ntohs(inet_rsk(req)->rmt_port),
1da177e4
LT		 2036 TCP_SYN_RECV,
2037 0,0, /* could print option size, but that is af dependent. */
1ab1457c
YH		 2038 1, /* timers active (only the expire timer) */
2039 jiffies_to_clock_t(ttd),
1da177e4
LT		 2040 req->retrans,
2041 uid,
1ab1457c 2042 0, /* non standard timer */
1da177e4
LT		 2043 0, /* open_requests have no inode */
2044 0, req);
2045}
2046
2047static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
2048{
b71d1d42 2049 const struct in6_addr *dest, *src;
1da177e4
LT		 2050 __u16 destp, srcp;
2051 int timer_active;
2052 unsigned long timer_expires;
cf533ea5
ED		 2053 const struct inet_sock *inet = inet_sk(sp);
2054 const struct tcp_sock *tp = tcp_sk(sp);
463c84b9 2055 const struct inet_connection_sock *icsk = inet_csk(sp);
cf533ea5 2056 const struct ipv6_pinfo *np = inet6_sk(sp);
1da177e4
LT		 2057
2058 dest = &np->daddr;
2059 src = &np->rcv_saddr;
c720c7e8
ED		 2060 destp = ntohs(inet->inet_dport);
2061 srcp = ntohs(inet->inet_sport);
463c84b9
ACM		 2062
2063 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1da177e4 2064 timer_active = 1;
463c84b9
ACM		 2065 timer_expires = icsk->icsk_timeout;
2066 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1da177e4 2067 timer_active = 4;
463c84b9 2068 timer_expires = icsk->icsk_timeout;
1da177e4
LT		 2069 } else if (timer_pending(&sp->sk_timer)) {
2070 timer_active = 2;
2071 timer_expires = sp->sk_timer.expires;
2072 } else {
2073 timer_active = 0;
2074 timer_expires = jiffies;
2075 }
2076
2077 seq_printf(seq,
2078 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2079 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
1da177e4
LT		 2080 i,
2081 src->s6_addr32[0], src->s6_addr32[1],
2082 src->s6_addr32[2], src->s6_addr32[3], srcp,
2083 dest->s6_addr32[0], dest->s6_addr32[1],
2084 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1ab1457c 2085 sp->sk_state,
47da8ee6
SS		 2086 tp->write_seq-tp->snd_una,
2087 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1da177e4
LT		 2088 timer_active,
2089 jiffies_to_clock_t(timer_expires - jiffies),
463c84b9 2090 icsk->icsk_retransmits,
1da177e4 2091 sock_i_uid(sp),
6687e988 2092 icsk->icsk_probes_out,
1da177e4
LT		 2093 sock_i_ino(sp),
2094 atomic_read(&sp->sk_refcnt), sp,
7be87351
SH		 2095 jiffies_to_clock_t(icsk->icsk_rto),
2096 jiffies_to_clock_t(icsk->icsk_ack.ato),
463c84b9 2097 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
0b6a05c1
IJ		 2098 tp->snd_cwnd,
2099 tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
1da177e4
LT		 2100 );
2101}
2102
1ab1457c 2103static void get_timewait6_sock(struct seq_file *seq,
8feaf0c0 2104 struct inet_timewait_sock *tw, int i)
1da177e4 2105{
b71d1d42 2106 const struct in6_addr *dest, *src;
1da177e4 2107 __u16 destp, srcp;
cf533ea5 2108 const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1da177e4
LT		 2109 int ttd = tw->tw_ttd - jiffies;
2110
2111 if (ttd < 0)
2112 ttd = 0;
2113
0fa1a53e
ACM		 2114 dest = &tw6->tw_v6_daddr;
2115 src = &tw6->tw_v6_rcv_saddr;
1da177e4
LT		 2116 destp = ntohs(tw->tw_dport);
2117 srcp = ntohs(tw->tw_sport);
2118
2119 seq_printf(seq,
2120 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2121 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1da177e4
LT		 2122 i,
2123 src->s6_addr32[0], src->s6_addr32[1],
2124 src->s6_addr32[2], src->s6_addr32[3], srcp,
2125 dest->s6_addr32[0], dest->s6_addr32[1],
2126 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2127 tw->tw_substate, 0, 0,
2128 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2129 atomic_read(&tw->tw_refcnt), tw);
2130}
2131
1da177e4
LT		 2132static int tcp6_seq_show(struct seq_file *seq, void *v)
2133{
2134 struct tcp_iter_state *st;
2135
2136 if (v == SEQ_START_TOKEN) {
2137 seq_puts(seq,
2138 " sl "
2139 "local_address "
2140 "remote_address "
2141 "st tx_queue rx_queue tr tm->when retrnsmt"
2142 " uid timeout inode\n");
2143 goto out;
2144 }
2145 st = seq->private;
2146
2147 switch (st->state) {
2148 case TCP_SEQ_STATE_LISTENING:
2149 case TCP_SEQ_STATE_ESTABLISHED:
2150 get_tcp6_sock(seq, v, st->num);
2151 break;
2152 case TCP_SEQ_STATE_OPENREQ:
2153 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2154 break;
2155 case TCP_SEQ_STATE_TIME_WAIT:
2156 get_timewait6_sock(seq, v, st->num);
2157 break;
2158 }
2159out:
2160 return 0;
2161}
2162
73cb88ec
AV		 2163static const struct file_operations tcp6_afinfo_seq_fops = {
2164 .owner = THIS_MODULE,
2165 .open = tcp_seq_open,
2166 .read = seq_read,
2167 .llseek = seq_lseek,
2168 .release = seq_release_net
2169};
2170
1da177e4 2171static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1da177e4
LT		 2172 .name = "tcp6",
2173 .family = AF_INET6,
73cb88ec 2174 .seq_fops = &tcp6_afinfo_seq_fops,
9427c4b3
DL		 2175 .seq_ops = {
2176 .show = tcp6_seq_show,
2177 },
1da177e4
LT		 2178};
2179
2c8c1e72 2180int __net_init tcp6_proc_init(struct net *net)
1da177e4 2181{
6f8b13bc 2182 return tcp_proc_register(net, &tcp6_seq_afinfo);
1da177e4
LT		 2183}
2184
6f8b13bc 2185void tcp6_proc_exit(struct net *net)
1da177e4 2186{
6f8b13bc 2187 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1da177e4
LT		 2188}
2189#endif
2190
2191struct proto tcpv6_prot = {
2192 .name = "TCPv6",
2193 .owner = THIS_MODULE,
2194 .close = tcp_close,
2195 .connect = tcp_v6_connect,
2196 .disconnect = tcp_disconnect,
463c84b9 2197 .accept = inet_csk_accept,
1da177e4
LT		 2198 .ioctl = tcp_ioctl,
2199 .init = tcp_v6_init_sock,
2200 .destroy = tcp_v6_destroy_sock,
2201 .shutdown = tcp_shutdown,
2202 .setsockopt = tcp_setsockopt,
2203 .getsockopt = tcp_getsockopt,
1da177e4 2204 .recvmsg = tcp_recvmsg,
7ba42910
CG		 2205 .sendmsg = tcp_sendmsg,
2206 .sendpage = tcp_sendpage,
1da177e4
LT		 2207 .backlog_rcv = tcp_v6_do_rcv,
2208 .hash = tcp_v6_hash,
ab1e0a13
ACM		 2209 .unhash = inet_unhash,
2210 .get_port = inet_csk_get_port,
1da177e4
LT		 2211 .enter_memory_pressure = tcp_enter_memory_pressure,
2212 .sockets_allocated = &tcp_sockets_allocated,
2213 .memory_allocated = &tcp_memory_allocated,
2214 .memory_pressure = &tcp_memory_pressure,
0a5578cf 2215 .orphan_count = &tcp_orphan_count,
1da177e4
LT		 2216 .sysctl_mem = sysctl_tcp_mem,
2217 .sysctl_wmem = sysctl_tcp_wmem,
2218 .sysctl_rmem = sysctl_tcp_rmem,
2219 .max_header = MAX_TCP_HEADER,
2220 .obj_size = sizeof(struct tcp6_sock),
3ab5aee7 2221 .slab_flags = SLAB_DESTROY_BY_RCU,
6d6ee43e 2222 .twsk_prot = &tcp6_timewait_sock_ops,
60236fdd 2223 .rsk_prot = &tcp6_request_sock_ops,
39d8cda7 2224 .h.hashinfo = &tcp_hashinfo,
7ba42910 2225 .no_autobind = true,
543d9cfe
ACM		 2226#ifdef CONFIG_COMPAT
2227 .compat_setsockopt = compat_tcp_setsockopt,
2228 .compat_getsockopt = compat_tcp_getsockopt,
2229#endif
1da177e4
LT		 2230};
2231
41135cc8 2232static const struct inet6_protocol tcpv6_protocol = {
1da177e4
LT		 2233 .handler = tcp_v6_rcv,
2234 .err_handler = tcp_v6_err,
a430a43d 2235 .gso_send_check = tcp_v6_gso_send_check,
adcfc7d0 2236 .gso_segment = tcp_tso_segment,
684f2176
HX		 2237 .gro_receive = tcp6_gro_receive,
2238 .gro_complete = tcp6_gro_complete,
1da177e4
LT		 2239 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2240};
2241
1da177e4
LT		 2242static struct inet_protosw tcpv6_protosw = {
2243 .type = SOCK_STREAM,
2244 .protocol = IPPROTO_TCP,
2245 .prot = &tcpv6_prot,
2246 .ops = &inet6_stream_ops,
1da177e4 2247 .no_check = 0,
d83d8461
ACM		 2248 .flags = INET_PROTOSW_PERMANENT |
2249 INET_PROTOSW_ICSK,
1da177e4
LT		 2250};
2251
2c8c1e72 2252static int __net_init tcpv6_net_init(struct net *net)
93ec926b 2253{
5677242f
DL		 2254 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2255 SOCK_RAW, IPPROTO_TCP, net);
93ec926b
DL		 2256}
2257
2c8c1e72 2258static void __net_exit tcpv6_net_exit(struct net *net)
93ec926b 2259{
5677242f 2260 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
b099ce26
EB		 2261}
2262
2c8c1e72 2263static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
b099ce26
EB		 2264{
2265 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
93ec926b
DL		 2266}
2267
2268static struct pernet_operations tcpv6_net_ops = {
b099ce26
EB		 2269 .init = tcpv6_net_init,
2270 .exit = tcpv6_net_exit,
2271 .exit_batch = tcpv6_net_exit_batch,
93ec926b
DL		 2272};
2273
7f4e4868 2274int __init tcpv6_init(void)
1da177e4 2275{
7f4e4868
DL		 2276 int ret;
2277
2278 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2279 if (ret)
2280 goto out;
2281
1da177e4 2282 /* register inet6 protocol */
7f4e4868
DL		 2283 ret = inet6_register_protosw(&tcpv6_protosw);
2284 if (ret)
2285 goto out_tcpv6_protocol;
2286
93ec926b 2287 ret = register_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2288 if (ret)
2289 goto out_tcpv6_protosw;
2290out:
2291 return ret;
ae0f7d5f 2292
7f4e4868
DL		 2293out_tcpv6_protocol:
2294 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2295out_tcpv6_protosw:
2296 inet6_unregister_protosw(&tcpv6_protosw);
2297 goto out;
2298}
2299
09f7709f 2300void tcpv6_exit(void)
7f4e4868 2301{
93ec926b 2302 unregister_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2303 inet6_unregister_protosw(&tcpv6_protosw);
2304 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1da177e4 2305}
kernel source for telekom puls (alcatel/mediatek)