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Add ethtool -g support to virtio_net
[linux-2.6-block.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;
156 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
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
198 ipv6_addr_copy(&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
DM		 246 fl6.flowi6_proto = IPPROTO_TCP;
247 ipv6_addr_copy(&fl6.daddr, &np->daddr);
248 ipv6_addr_copy(&fl6.saddr,
1da177e4 249 (saddr ? saddr : &np->saddr));
4c9483b2
DM		 250 fl6.flowi6_oif = sk->sk_bound_dev_if;
251 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 252 fl6.fl6_dport = usin->sin6_port;
253 fl6.fl6_sport = inet->inet_sport;
1da177e4 254
4c9483b2 255 final_p = fl6_update_dst(&fl6, np->opt, &final);
1da177e4 256
4c9483b2 257 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
beb8d13b 258
4c9483b2 259 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
68d0c6d3
DM		 260 if (IS_ERR(dst)) {
261 err = PTR_ERR(dst);
1da177e4 262 goto failure;
14e50e57 263 }
1da177e4
LT		 264
265 if (saddr == NULL) {
4c9483b2 266 saddr = &fl6.saddr;
1da177e4
LT		 267 ipv6_addr_copy(&np->rcv_saddr, saddr);
268 }
269
270 /* set the source address */
271 ipv6_addr_copy(&np->saddr, saddr);
c720c7e8 272 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
1da177e4 273
f83ef8c0 274 sk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 275 __ip6_dst_store(sk, dst, NULL, NULL);
1da177e4 276
493f377d
DM		 277 rt = (struct rt6_info *) dst;
278 if (tcp_death_row.sysctl_tw_recycle &&
279 !tp->rx_opt.ts_recent_stamp &&
280 ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) {
281 struct inet_peer *peer = rt6_get_peer(rt);
282 /*
283 * VJ's idea. We save last timestamp seen from
284 * the destination in peer table, when entering state
285 * TIME-WAIT * and initialize rx_opt.ts_recent from it,
286 * when trying new connection.
287 */
288 if (peer) {
289 inet_peer_refcheck(peer);
290 if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
291 tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
292 tp->rx_opt.ts_recent = peer->tcp_ts;
293 }
294 }
295 }
296
d83d8461 297 icsk->icsk_ext_hdr_len = 0;
1da177e4 298 if (np->opt)
d83d8461
ACM		 299 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
300 np->opt->opt_nflen);
1da177e4
LT		 301
302 tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr);
303
c720c7e8 304 inet->inet_dport = usin->sin6_port;
1da177e4
LT		 305
306 tcp_set_state(sk, TCP_SYN_SENT);
d8313f5c 307 err = inet6_hash_connect(&tcp_death_row, sk);
1da177e4
LT		 308 if (err)
309 goto late_failure;
310
311 if (!tp->write_seq)
312 tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32,
313 np->daddr.s6_addr32,
c720c7e8
ED		 314 inet->inet_sport,
315 inet->inet_dport);
1da177e4
LT		 316
317 err = tcp_connect(sk);
318 if (err)
319 goto late_failure;
320
321 return 0;
322
323late_failure:
324 tcp_set_state(sk, TCP_CLOSE);
325 __sk_dst_reset(sk);
326failure:
c720c7e8 327 inet->inet_dport = 0;
1da177e4
LT		 328 sk->sk_route_caps = 0;
329 return err;
330}
331
332static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
d5fdd6ba 333 u8 type, u8 code, int offset, __be32 info)
1da177e4 334{
b71d1d42 335 const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data;
505cbfc5 336 const struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
1da177e4
LT		 337 struct ipv6_pinfo *np;
338 struct sock *sk;
339 int err;
1ab1457c 340 struct tcp_sock *tp;
1da177e4 341 __u32 seq;
ca12a1a4 342 struct net *net = dev_net(skb->dev);
1da177e4 343
ca12a1a4 344 sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr,
d86e0dac 345 th->dest, &hdr->saddr, th->source, skb->dev->ifindex);
1da177e4
LT		 346
347 if (sk == NULL) {
e41b5368
DL		 348 ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev),
349 ICMP6_MIB_INERRORS);
1da177e4
LT		 350 return;
351 }
352
353 if (sk->sk_state == TCP_TIME_WAIT) {
9469c7b4 354 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 355 return;
356 }
357
358 bh_lock_sock(sk);
359 if (sock_owned_by_user(sk))
de0744af 360 NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS);
1da177e4
LT		 361
362 if (sk->sk_state == TCP_CLOSE)
363 goto out;
364
e802af9c
SH		 365 if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) {
366 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
367 goto out;
368 }
369
1da177e4 370 tp = tcp_sk(sk);
1ab1457c 371 seq = ntohl(th->seq);
1da177e4
LT		 372 if (sk->sk_state != TCP_LISTEN &&
373 !between(seq, tp->snd_una, tp->snd_nxt)) {
de0744af 374 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
1da177e4
LT		 375 goto out;
376 }
377
378 np = inet6_sk(sk);
379
380 if (type == ICMPV6_PKT_TOOBIG) {
68d0c6d3 381 struct dst_entry *dst;
1da177e4
LT		 382
383 if (sock_owned_by_user(sk))
384 goto out;
385 if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
386 goto out;
387
388 /* icmp should have updated the destination cache entry */
389 dst = __sk_dst_check(sk, np->dst_cookie);
390
391 if (dst == NULL) {
392 struct inet_sock *inet = inet_sk(sk);
4c9483b2 393 struct flowi6 fl6;
1da177e4
LT		 394
395 /* BUGGG_FUTURE: Again, it is not clear how
396 to handle rthdr case. Ignore this complexity
397 for now.
398 */
4c9483b2
DM		 399 memset(&fl6, 0, sizeof(fl6));
400 fl6.flowi6_proto = IPPROTO_TCP;
401 ipv6_addr_copy(&fl6.daddr, &np->daddr);
402 ipv6_addr_copy(&fl6.saddr, &np->saddr);
403 fl6.flowi6_oif = sk->sk_bound_dev_if;
404 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 405 fl6.fl6_dport = inet->inet_dport;
406 fl6.fl6_sport = inet->inet_sport;
4c9483b2
DM		 407 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
408
409 dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
68d0c6d3
DM		 410 if (IS_ERR(dst)) {
411 sk->sk_err_soft = -PTR_ERR(dst);
1da177e4
LT		 412 goto out;
413 }
414
415 } else
416 dst_hold(dst);
417
d83d8461 418 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
1da177e4
LT		 419 tcp_sync_mss(sk, dst_mtu(dst));
420 tcp_simple_retransmit(sk);
421 } /* else let the usual retransmit timer handle it */
422 dst_release(dst);
423 goto out;
424 }
425
426 icmpv6_err_convert(type, code, &err);
427
60236fdd 428 /* Might be for an request_sock */
1da177e4 429 switch (sk->sk_state) {
60236fdd 430 struct request_sock *req, **prev;
1da177e4
LT		 431 case TCP_LISTEN:
432 if (sock_owned_by_user(sk))
433 goto out;
434
8129765a
ACM		 435 req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr,
436 &hdr->saddr, inet6_iif(skb));
1da177e4
LT		 437 if (!req)
438 goto out;
439
440 /* ICMPs are not backlogged, hence we cannot get
441 * an established socket here.
442 */
547b792c 443 WARN_ON(req->sk != NULL);
1da177e4 444
2e6599cb 445 if (seq != tcp_rsk(req)->snt_isn) {
de0744af 446 NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS);
1da177e4
LT		 447 goto out;
448 }
449
463c84b9 450 inet_csk_reqsk_queue_drop(sk, req, prev);
1da177e4
LT		 451 goto out;
452
453 case TCP_SYN_SENT:
454 case TCP_SYN_RECV: /* Cannot happen.
1ab1457c 455 It can, it SYNs are crossed. --ANK */
1da177e4 456 if (!sock_owned_by_user(sk)) {
1da177e4
LT		 457 sk->sk_err = err;
458 sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */
459
460 tcp_done(sk);
461 } else
462 sk->sk_err_soft = err;
463 goto out;
464 }
465
466 if (!sock_owned_by_user(sk) && np->recverr) {
467 sk->sk_err = err;
468 sk->sk_error_report(sk);
469 } else
470 sk->sk_err_soft = err;
471
472out:
473 bh_unlock_sock(sk);
474 sock_put(sk);
475}
476
477
e6b4d113
WAS		 478static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
479 struct request_values *rvp)
1da177e4 480{
ca304b61 481 struct inet6_request_sock *treq = inet6_rsk(req);
1da177e4
LT		 482 struct ipv6_pinfo *np = inet6_sk(sk);
483 struct sk_buff * skb;
484 struct ipv6_txoptions *opt = NULL;
20c59de2 485 struct in6_addr * final_p, final;
4c9483b2 486 struct flowi6 fl6;
fd80eb94 487 struct dst_entry *dst;
68d0c6d3 488 int err;
1da177e4 489
4c9483b2
DM		 490 memset(&fl6, 0, sizeof(fl6));
491 fl6.flowi6_proto = IPPROTO_TCP;
492 ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
493 ipv6_addr_copy(&fl6.saddr, &treq->loc_addr);
494 fl6.flowlabel = 0;
495 fl6.flowi6_oif = treq->iif;
496 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 497 fl6.fl6_dport = inet_rsk(req)->rmt_port;
498 fl6.fl6_sport = inet_rsk(req)->loc_port;
4c9483b2 499 security_req_classify_flow(req, flowi6_to_flowi(&fl6));
1da177e4 500
fd80eb94 501 opt = np->opt;
4c9483b2 502 final_p = fl6_update_dst(&fl6, opt, &final);
1da177e4 503
4c9483b2 504 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
68d0c6d3
DM		 505 if (IS_ERR(dst)) {
506 err = PTR_ERR(dst);
738faca3 507 dst = NULL;
fd80eb94 508 goto done;
68d0c6d3 509 }
e6b4d113 510 skb = tcp_make_synack(sk, dst, req, rvp);
68d0c6d3 511 err = -ENOMEM;
1da177e4 512 if (skb) {
8ad50d96 513 __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);
1da177e4 514
4c9483b2
DM		 515 ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr);
516 err = ip6_xmit(sk, skb, &fl6, opt);
b9df3cb8 517 err = net_xmit_eval(err);
1da177e4
LT		 518 }
519
520done:
1ab1457c 521 if (opt && opt != np->opt)
1da177e4 522 sock_kfree_s(sk, opt, opt->tot_len);
78b91042 523 dst_release(dst);
1da177e4
LT		 524 return err;
525}
526
72659ecc
OP		 527static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req,
528 struct request_values *rvp)
529{
530 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS);
531 return tcp_v6_send_synack(sk, req, rvp);
532}
533
60236fdd 534static void tcp_v6_reqsk_destructor(struct request_sock *req)
1da177e4 535{
800d55f1 536 kfree_skb(inet6_rsk(req)->pktopts);
1da177e4
LT		 537}
538
cfb6eeb4
YH		 539#ifdef CONFIG_TCP_MD5SIG
540static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
b71d1d42 541 const struct in6_addr *addr)
cfb6eeb4
YH		 542{
543 struct tcp_sock *tp = tcp_sk(sk);
544 int i;
545
546 BUG_ON(tp == NULL);
547
548 if (!tp->md5sig_info || !tp->md5sig_info->entries6)
549 return NULL;
550
551 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 552 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr))
f8ab18d2 553 return &tp->md5sig_info->keys6[i].base;
cfb6eeb4
YH		 554 }
555 return NULL;
556}
557
558static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
559 struct sock *addr_sk)
560{
561 return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr);
562}
563
564static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
565 struct request_sock *req)
566{
567 return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr);
568}
569
b71d1d42 570static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer,
cfb6eeb4
YH		 571 char *newkey, u8 newkeylen)
572{
573 /* Add key to the list */
b0a713e9 574 struct tcp_md5sig_key *key;
cfb6eeb4
YH		 575 struct tcp_sock *tp = tcp_sk(sk);
576 struct tcp6_md5sig_key *keys;
577
b0a713e9 578 key = tcp_v6_md5_do_lookup(sk, peer);
cfb6eeb4
YH		 579 if (key) {
580 /* modify existing entry - just update that one */
b0a713e9
MD		 581 kfree(key->key);
582 key->key = newkey;
583 key->keylen = newkeylen;
cfb6eeb4
YH		 584 } else {
585 /* reallocate new list if current one is full. */
586 if (!tp->md5sig_info) {
587 tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC);
588 if (!tp->md5sig_info) {
589 kfree(newkey);
590 return -ENOMEM;
591 }
a465419b 592 sk_nocaps_add(sk, NETIF_F_GSO_MASK);
cfb6eeb4 593 }
260fcbeb
YZ		 594 if (tp->md5sig_info->entries6 == 0 &&
595 tcp_alloc_md5sig_pool(sk) == NULL) {
aacbe8c8
YH		 596 kfree(newkey);
597 return -ENOMEM;
598 }
cfb6eeb4
YH		 599 if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) {
600 keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) *
601 (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC);
602
603 if (!keys) {
cfb6eeb4 604 kfree(newkey);
260fcbeb
YZ		 605 if (tp->md5sig_info->entries6 == 0)
606 tcp_free_md5sig_pool();
cfb6eeb4
YH		 607 return -ENOMEM;
608 }
609
610 if (tp->md5sig_info->entries6)
611 memmove(keys, tp->md5sig_info->keys6,
612 (sizeof (tp->md5sig_info->keys6[0]) *
613 tp->md5sig_info->entries6));
614
615 kfree(tp->md5sig_info->keys6);
616 tp->md5sig_info->keys6 = keys;
617 tp->md5sig_info->alloced6++;
618 }
619
620 ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr,
621 peer);
f8ab18d2
DM		 622 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey;
623 tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen;
cfb6eeb4
YH		 624
625 tp->md5sig_info->entries6++;
626 }
627 return 0;
628}
629
630static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk,
631 u8 *newkey, __u8 newkeylen)
632{
633 return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr,
634 newkey, newkeylen);
635}
636
b71d1d42 637static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer)
cfb6eeb4
YH		 638{
639 struct tcp_sock *tp = tcp_sk(sk);
640 int i;
641
642 for (i = 0; i < tp->md5sig_info->entries6; i++) {
caad295f 643 if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) {
cfb6eeb4 644 /* Free the key */
f8ab18d2 645 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 646 tp->md5sig_info->entries6--;
647
648 if (tp->md5sig_info->entries6 == 0) {
649 kfree(tp->md5sig_info->keys6);
650 tp->md5sig_info->keys6 = NULL;
ca983cef 651 tp->md5sig_info->alloced6 = 0;
260fcbeb 652 tcp_free_md5sig_pool();
cfb6eeb4
YH		 653 } else {
654 /* shrink the database */
655 if (tp->md5sig_info->entries6 != i)
656 memmove(&tp->md5sig_info->keys6[i],
657 &tp->md5sig_info->keys6[i+1],
658 (tp->md5sig_info->entries6 - i)
659 * sizeof (tp->md5sig_info->keys6[0]));
660 }
77adefdc 661 return 0;
cfb6eeb4
YH		 662 }
663 }
664 return -ENOENT;
665}
666
667static void tcp_v6_clear_md5_list (struct sock *sk)
668{
669 struct tcp_sock *tp = tcp_sk(sk);
670 int i;
671
672 if (tp->md5sig_info->entries6) {
673 for (i = 0; i < tp->md5sig_info->entries6; i++)
f8ab18d2 674 kfree(tp->md5sig_info->keys6[i].base.key);
cfb6eeb4
YH		 675 tp->md5sig_info->entries6 = 0;
676 tcp_free_md5sig_pool();
677 }
678
679 kfree(tp->md5sig_info->keys6);
680 tp->md5sig_info->keys6 = NULL;
681 tp->md5sig_info->alloced6 = 0;
682
683 if (tp->md5sig_info->entries4) {
684 for (i = 0; i < tp->md5sig_info->entries4; i++)
f8ab18d2 685 kfree(tp->md5sig_info->keys4[i].base.key);
cfb6eeb4
YH		 686 tp->md5sig_info->entries4 = 0;
687 tcp_free_md5sig_pool();
688 }
689
690 kfree(tp->md5sig_info->keys4);
691 tp->md5sig_info->keys4 = NULL;
692 tp->md5sig_info->alloced4 = 0;
693}
694
695static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
696 int optlen)
697{
698 struct tcp_md5sig cmd;
699 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
700 u8 *newkey;
701
702 if (optlen < sizeof(cmd))
703 return -EINVAL;
704
705 if (copy_from_user(&cmd, optval, sizeof(cmd)))
706 return -EFAULT;
707
708 if (sin6->sin6_family != AF_INET6)
709 return -EINVAL;
710
711 if (!cmd.tcpm_keylen) {
712 if (!tcp_sk(sk)->md5sig_info)
713 return -ENOENT;
e773e4fa 714 if (ipv6_addr_v4mapped(&sin6->sin6_addr))
cfb6eeb4
YH		 715 return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]);
716 return tcp_v6_md5_do_del(sk, &sin6->sin6_addr);
717 }
718
719 if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
720 return -EINVAL;
721
722 if (!tcp_sk(sk)->md5sig_info) {
723 struct tcp_sock *tp = tcp_sk(sk);
724 struct tcp_md5sig_info *p;
725
726 p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL);
727 if (!p)
728 return -ENOMEM;
729
730 tp->md5sig_info = p;
a465419b 731 sk_nocaps_add(sk, NETIF_F_GSO_MASK);
cfb6eeb4
YH		 732 }
733
af879cc7 734 newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
cfb6eeb4
YH		 735 if (!newkey)
736 return -ENOMEM;
e773e4fa 737 if (ipv6_addr_v4mapped(&sin6->sin6_addr)) {
cfb6eeb4
YH		 738 return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
739 newkey, cmd.tcpm_keylen);
740 }
741 return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen);
742}
743
49a72dfb 744static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp,
b71d1d42
ED		 745 const struct in6_addr *daddr,
746 const struct in6_addr *saddr, int nbytes)
cfb6eeb4 747{
cfb6eeb4 748 struct tcp6_pseudohdr *bp;
49a72dfb 749 struct scatterlist sg;
8d26d76d 750
cfb6eeb4 751 bp = &hp->md5_blk.ip6;
cfb6eeb4
YH		 752 /* 1. TCP pseudo-header (RFC2460) */
753 ipv6_addr_copy(&bp->saddr, saddr);
754 ipv6_addr_copy(&bp->daddr, daddr);
49a72dfb 755 bp->protocol = cpu_to_be32(IPPROTO_TCP);
00b1304c 756 bp->len = cpu_to_be32(nbytes);
cfb6eeb4 757
49a72dfb
AL		 758 sg_init_one(&sg, bp, sizeof(*bp));
759 return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp));
760}
c7da57a1 761
49a72dfb 762static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key,
b71d1d42 763 const struct in6_addr *daddr, struct in6_addr *saddr,
49a72dfb
AL		 764 struct tcphdr *th)
765{
766 struct tcp_md5sig_pool *hp;
767 struct hash_desc *desc;
768
769 hp = tcp_get_md5sig_pool();
770 if (!hp)
771 goto clear_hash_noput;
772 desc = &hp->md5_desc;
773
774 if (crypto_hash_init(desc))
775 goto clear_hash;
776 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2))
777 goto clear_hash;
778 if (tcp_md5_hash_header(hp, th))
779 goto clear_hash;
780 if (tcp_md5_hash_key(hp, key))
781 goto clear_hash;
782 if (crypto_hash_final(desc, md5_hash))
cfb6eeb4 783 goto clear_hash;
cfb6eeb4 784
cfb6eeb4 785 tcp_put_md5sig_pool();
cfb6eeb4 786 return 0;
49a72dfb 787
cfb6eeb4
YH		 788clear_hash:
789 tcp_put_md5sig_pool();
790clear_hash_noput:
791 memset(md5_hash, 0, 16);
49a72dfb 792 return 1;
cfb6eeb4
YH		 793}
794
49a72dfb
AL		 795static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key,
796 struct sock *sk, struct request_sock *req,
797 struct sk_buff *skb)
cfb6eeb4 798{
b71d1d42 799 const struct in6_addr *saddr, *daddr;
49a72dfb
AL		 800 struct tcp_md5sig_pool *hp;
801 struct hash_desc *desc;
802 struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4
YH		 803
804 if (sk) {
805 saddr = &inet6_sk(sk)->saddr;
806 daddr = &inet6_sk(sk)->daddr;
49a72dfb 807 } else if (req) {
cfb6eeb4
YH		 808 saddr = &inet6_rsk(req)->loc_addr;
809 daddr = &inet6_rsk(req)->rmt_addr;
49a72dfb 810 } else {
b71d1d42 811 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
49a72dfb
AL		 812 saddr = &ip6h->saddr;
813 daddr = &ip6h->daddr;
cfb6eeb4 814 }
49a72dfb
AL		 815
816 hp = tcp_get_md5sig_pool();
817 if (!hp)
818 goto clear_hash_noput;
819 desc = &hp->md5_desc;
820
821 if (crypto_hash_init(desc))
822 goto clear_hash;
823
824 if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len))
825 goto clear_hash;
826 if (tcp_md5_hash_header(hp, th))
827 goto clear_hash;
828 if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
829 goto clear_hash;
830 if (tcp_md5_hash_key(hp, key))
831 goto clear_hash;
832 if (crypto_hash_final(desc, md5_hash))
833 goto clear_hash;
834
835 tcp_put_md5sig_pool();
836 return 0;
837
838clear_hash:
839 tcp_put_md5sig_pool();
840clear_hash_noput:
841 memset(md5_hash, 0, 16);
842 return 1;
cfb6eeb4
YH		 843}
844
845static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb)
846{
cf533ea5 847 const __u8 *hash_location = NULL;
cfb6eeb4 848 struct tcp_md5sig_key *hash_expected;
b71d1d42 849 const struct ipv6hdr *ip6h = ipv6_hdr(skb);
aa8223c7 850 struct tcphdr *th = tcp_hdr(skb);
cfb6eeb4 851 int genhash;
cfb6eeb4
YH		 852 u8 newhash[16];
853
854 hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
7d5d5525 855 hash_location = tcp_parse_md5sig_option(th);
cfb6eeb4 856
785957d3
DM		 857 /* We've parsed the options - do we have a hash? */
858 if (!hash_expected && !hash_location)
859 return 0;
860
861 if (hash_expected && !hash_location) {
862 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
cfb6eeb4
YH		 863 return 1;
864 }
865
785957d3
DM		 866 if (!hash_expected && hash_location) {
867 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
cfb6eeb4
YH		 868 return 1;
869 }
870
871 /* check the signature */
49a72dfb
AL		 872 genhash = tcp_v6_md5_hash_skb(newhash,
873 hash_expected,
874 NULL, NULL, skb);
875
cfb6eeb4
YH		 876 if (genhash || memcmp(hash_location, newhash, 16) != 0) {
877 if (net_ratelimit()) {
5856b606 878 printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
cfb6eeb4 879 genhash ? "failed" : "mismatch",
0c6ce78a
HH		 880 &ip6h->saddr, ntohs(th->source),
881 &ip6h->daddr, ntohs(th->dest));
cfb6eeb4
YH		 882 }
883 return 1;
884 }
885 return 0;
886}
887#endif
888
c6aefafb 889struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
1da177e4 890 .family = AF_INET6,
2e6599cb 891 .obj_size = sizeof(struct tcp6_request_sock),
72659ecc 892 .rtx_syn_ack = tcp_v6_rtx_synack,
60236fdd
ACM		 893 .send_ack = tcp_v6_reqsk_send_ack,
894 .destructor = tcp_v6_reqsk_destructor,
72659ecc
OP		 895 .send_reset = tcp_v6_send_reset,
896 .syn_ack_timeout = tcp_syn_ack_timeout,
1da177e4
LT		 897};
898
cfb6eeb4 899#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 900static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
cfb6eeb4 901 .md5_lookup = tcp_v6_reqsk_md5_lookup,
e3afe7b7 902 .calc_md5_hash = tcp_v6_md5_hash_skb,
cfb6eeb4 903};
b6332e6c 904#endif
cfb6eeb4 905
8ad50d96 906static void __tcp_v6_send_check(struct sk_buff *skb,
b71d1d42 907 const struct in6_addr *saddr, const struct in6_addr *daddr)
1da177e4 908{
aa8223c7 909 struct tcphdr *th = tcp_hdr(skb);
1da177e4 910
84fa7933 911 if (skb->ip_summed == CHECKSUM_PARTIAL) {
8ad50d96 912 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
663ead3b 913 skb->csum_start = skb_transport_header(skb) - skb->head;
ff1dcadb 914 skb->csum_offset = offsetof(struct tcphdr, check);
1da177e4 915 } else {
8ad50d96
HX		 916 th->check = tcp_v6_check(skb->len, saddr, daddr,
917 csum_partial(th, th->doff << 2,
918 skb->csum));
1da177e4
LT		 919 }
920}
921
bb296246 922static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb)
8ad50d96
HX		 923{
924 struct ipv6_pinfo *np = inet6_sk(sk);
925
926 __tcp_v6_send_check(skb, &np->saddr, &np->daddr);
927}
928
a430a43d
HX		 929static int tcp_v6_gso_send_check(struct sk_buff *skb)
930{
b71d1d42 931 const struct ipv6hdr *ipv6h;
a430a43d
HX		 932 struct tcphdr *th;
933
934 if (!pskb_may_pull(skb, sizeof(*th)))
935 return -EINVAL;
936
0660e03f 937 ipv6h = ipv6_hdr(skb);
aa8223c7 938 th = tcp_hdr(skb);
a430a43d
HX		 939
940 th->check = 0;
84fa7933 941 skb->ip_summed = CHECKSUM_PARTIAL;
8ad50d96 942 __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
a430a43d
HX		 943 return 0;
944}
1da177e4 945
36990673
HX		 946static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
947 struct sk_buff *skb)
684f2176 948{
b71d1d42 949 const struct ipv6hdr *iph = skb_gro_network_header(skb);
684f2176
HX		 950
951 switch (skb->ip_summed) {
952 case CHECKSUM_COMPLETE:
86911732 953 if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr,
684f2176
HX		 954 skb->csum)) {
955 skb->ip_summed = CHECKSUM_UNNECESSARY;
956 break;
957 }
958
959 /* fall through */
960 case CHECKSUM_NONE:
961 NAPI_GRO_CB(skb)->flush = 1;
962 return NULL;
963 }
964
965 return tcp_gro_receive(head, skb);
966}
684f2176 967
36990673 968static int tcp6_gro_complete(struct sk_buff *skb)
684f2176 969{
b71d1d42 970 const struct ipv6hdr *iph = ipv6_hdr(skb);
684f2176
HX		 971 struct tcphdr *th = tcp_hdr(skb);
972
973 th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
974 &iph->saddr, &iph->daddr, 0);
975 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
976
977 return tcp_gro_complete(skb);
978}
684f2176 979
626e264d
IJ		 980static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
981 u32 ts, struct tcp_md5sig_key *key, int rst)
1da177e4 982{
cf533ea5
ED		 983 const struct tcphdr *th = tcp_hdr(skb);
984 struct tcphdr *t1;
1da177e4 985 struct sk_buff *buff;
4c9483b2 986 struct flowi6 fl6;
adf30907 987 struct net *net = dev_net(skb_dst(skb)->dev);
e5047992 988 struct sock *ctl_sk = net->ipv6.tcp_sk;
77c676da 989 unsigned int tot_len = sizeof(struct tcphdr);
adf30907 990 struct dst_entry *dst;
81ada62d 991 __be32 *topt;
1da177e4 992
626e264d
IJ		 993 if (ts)
994 tot_len += TCPOLEN_TSTAMP_ALIGNED;
cfb6eeb4 995#ifdef CONFIG_TCP_MD5SIG
cfb6eeb4
YH		 996 if (key)
997 tot_len += TCPOLEN_MD5SIG_ALIGNED;
998#endif
999
cfb6eeb4 1000 buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
1da177e4 1001 GFP_ATOMIC);
1ab1457c
YH		 1002 if (buff == NULL)
1003 return;
1da177e4 1004
cfb6eeb4 1005 skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len);
1da177e4 1006
cfb6eeb4 1007 t1 = (struct tcphdr *) skb_push(buff, tot_len);
6651ffc8 1008 skb_reset_transport_header(buff);
1da177e4
LT		 1009
1010 /* Swap the send and the receive. */
1011 memset(t1, 0, sizeof(*t1));
1012 t1->dest = th->source;
1013 t1->source = th->dest;
cfb6eeb4 1014 t1->doff = tot_len / 4;
626e264d
IJ		 1015 t1->seq = htonl(seq);
1016 t1->ack_seq = htonl(ack);
1017 t1->ack = !rst || !th->ack;
1018 t1->rst = rst;
1019 t1->window = htons(win);
1da177e4 1020
81ada62d
IJ		 1021 topt = (__be32 *)(t1 + 1);
1022
626e264d
IJ		 1023 if (ts) {
1024 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1025 (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
1026 *topt++ = htonl(tcp_time_stamp);
1027 *topt++ = htonl(ts);
1028 }
1029
cfb6eeb4
YH		 1030#ifdef CONFIG_TCP_MD5SIG
1031 if (key) {
81ada62d
IJ		 1032 *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
1033 (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
1034 tcp_v6_md5_hash_hdr((__u8 *)topt, key,
78e645cb
IJ		 1035 &ipv6_hdr(skb)->saddr,
1036 &ipv6_hdr(skb)->daddr, t1);
cfb6eeb4
YH		 1037 }
1038#endif
1039
4c9483b2
DM		 1040 memset(&fl6, 0, sizeof(fl6));
1041 ipv6_addr_copy(&fl6.daddr, &ipv6_hdr(skb)->saddr);
1042 ipv6_addr_copy(&fl6.saddr, &ipv6_hdr(skb)->daddr);
1da177e4 1043
e5700aff
DM		 1044 buff->ip_summed = CHECKSUM_PARTIAL;
1045 buff->csum = 0;
1046
4c9483b2 1047 __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr);
1da177e4 1048
4c9483b2
DM		 1049 fl6.flowi6_proto = IPPROTO_TCP;
1050 fl6.flowi6_oif = inet6_iif(skb);
1958b856
DM		 1051 fl6.fl6_dport = t1->dest;
1052 fl6.fl6_sport = t1->source;
4c9483b2 1053 security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
1da177e4 1054
c20121ae
DL		 1055 /* Pass a socket to ip6_dst_lookup either it is for RST
1056 * Underlying function will use this to retrieve the network
1057 * namespace
1058 */
4c9483b2 1059 dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false);
68d0c6d3
DM		 1060 if (!IS_ERR(dst)) {
1061 skb_dst_set(buff, dst);
4c9483b2 1062 ip6_xmit(ctl_sk, buff, &fl6, NULL);
68d0c6d3
DM		 1063 TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
1064 if (rst)
1065 TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
1066 return;
1da177e4
LT		 1067 }
1068
1069 kfree_skb(buff);
1070}
1071
626e264d 1072static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
1da177e4 1073{
cf533ea5 1074 const struct tcphdr *th = tcp_hdr(skb);
626e264d 1075 u32 seq = 0, ack_seq = 0;
fa3e5b4e 1076 struct tcp_md5sig_key *key = NULL;
1da177e4 1077
626e264d 1078 if (th->rst)
1da177e4
LT		 1079 return;
1080
626e264d
IJ		 1081 if (!ipv6_unicast_destination(skb))
1082 return;
1da177e4 1083
cfb6eeb4 1084#ifdef CONFIG_TCP_MD5SIG
626e264d
IJ		 1085 if (sk)
1086 key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
cfb6eeb4
YH		 1087#endif
1088
626e264d
IJ		 1089 if (th->ack)
1090 seq = ntohl(th->ack_seq);
1091 else
1092 ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len -
1093 (th->doff << 2);
1da177e4 1094
626e264d
IJ		 1095 tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1);
1096}
1da177e4 1097
626e264d
IJ		 1098static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts,
1099 struct tcp_md5sig_key *key)
1100{
1101 tcp_v6_send_response(skb, seq, ack, win, ts, key, 0);
1da177e4
LT		 1102}
1103
1104static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
1105{
8feaf0c0 1106 struct inet_timewait_sock *tw = inet_twsk(sk);
cfb6eeb4 1107 struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
1da177e4 1108
9501f972 1109 tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
8feaf0c0 1110 tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
9501f972 1111 tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw));
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,
6edafaaf 1120 tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr));
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);
0660e03f
ACM		 1251 ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
1252 ipv6_addr_copy(&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
2bbdf389 1256 if (!isn) {
493f377d
DM		 1257 struct inet_peer *peer = NULL;
1258
c6aefafb
GG		 1259 if (ipv6_opt_accepted(sk, skb) ||
1260 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
1261 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
1262 atomic_inc(&skb->users);
1263 treq->pktopts = skb;
1264 }
1265 treq->iif = sk->sk_bound_dev_if;
1da177e4 1266
c6aefafb
GG		 1267 /* So that link locals have meaning */
1268 if (!sk->sk_bound_dev_if &&
1269 ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
1270 treq->iif = inet6_iif(skb);
493f377d
DM		 1271
1272 if (want_cookie) {
2bbdf389
FW		 1273 isn = cookie_v6_init_sequence(sk, skb, &req->mss);
1274 req->cookie_ts = tmp_opt.tstamp_ok;
493f377d
DM		 1275 goto have_isn;
1276 }
1277
1278 /* VJ's idea. We save last timestamp seen
1279 * from the destination in peer table, when entering
1280 * state TIME-WAIT, and check against it before
1281 * accepting new connection request.
1282 *
1283 * If "isn" is not zero, this request hit alive
1284 * timewait bucket, so that all the necessary checks
1285 * are made in the function processing timewait state.
1286 */
1287 if (tmp_opt.saw_tstamp &&
1288 tcp_death_row.sysctl_tw_recycle &&
1289 (dst = inet6_csk_route_req(sk, req)) != NULL &&
1290 (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
7a71ed89 1291 ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
493f377d
DM		 1292 &treq->rmt_addr)) {
1293 inet_peer_refcheck(peer);
1294 if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
1295 (s32)(peer->tcp_ts - req->ts_recent) >
1296 TCP_PAWS_WINDOW) {
1297 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
1298 goto drop_and_release;
1299 }
1300 }
1301 /* Kill the following clause, if you dislike this way. */
1302 else if (!sysctl_tcp_syncookies &&
1303 (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
1304 (sysctl_max_syn_backlog >> 2)) &&
1305 (!peer || !peer->tcp_ts_stamp) &&
1306 (!dst || !dst_metric(dst, RTAX_RTT))) {
1307 /* Without syncookies last quarter of
1308 * backlog is filled with destinations,
1309 * proven to be alive.
1310 * It means that we continue to communicate
1311 * to destinations, already remembered
1312 * to the moment of synflood.
1313 */
1314 LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
1315 &treq->rmt_addr, ntohs(tcp_hdr(skb)->source));
1316 goto drop_and_release;
2bbdf389 1317 }
493f377d
DM		 1318
1319 isn = tcp_v6_init_sequence(skb);
c6aefafb 1320 }
493f377d 1321have_isn:
2e6599cb 1322 tcp_rsk(req)->snt_isn = isn;
9ad7c049 1323 tcp_rsk(req)->snt_synack = tcp_time_stamp;
1da177e4 1324
4237c75c
VY		 1325 security_inet_conn_request(sk, skb, req);
1326
4957faad
WAS		 1327 if (tcp_v6_send_synack(sk, req,
1328 (struct request_values *)&tmp_ext) ||
1329 want_cookie)
e6b4d113 1330 goto drop_and_free;
1da177e4 1331
e6b4d113
WAS		 1332 inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
1333 return 0;
1da177e4 1334
493f377d
DM		 1335drop_and_release:
1336 dst_release(dst);
e6b4d113
WAS		 1337drop_and_free:
1338 reqsk_free(req);
1da177e4 1339drop:
1da177e4
LT		 1340 return 0; /* don't send reset */
1341}
1342
1343static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
60236fdd 1344 struct request_sock *req,
1da177e4
LT		 1345 struct dst_entry *dst)
1346{
78d15e82 1347 struct inet6_request_sock *treq;
1da177e4
LT		 1348 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
1349 struct tcp6_sock *newtcp6sk;
1350 struct inet_sock *newinet;
1351 struct tcp_sock *newtp;
1352 struct sock *newsk;
1353 struct ipv6_txoptions *opt;
cfb6eeb4
YH		 1354#ifdef CONFIG_TCP_MD5SIG
1355 struct tcp_md5sig_key *key;
1356#endif
1da177e4
LT		 1357
1358 if (skb->protocol == htons(ETH_P_IP)) {
1359 /*
1360 * v6 mapped
1361 */
1362
1363 newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst);
1364
1ab1457c 1365 if (newsk == NULL)
1da177e4
LT		 1366 return NULL;
1367
1368 newtcp6sk = (struct tcp6_sock *)newsk;
1369 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1370
1371 newinet = inet_sk(newsk);
1372 newnp = inet6_sk(newsk);
1373 newtp = tcp_sk(newsk);
1374
1375 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1376
c720c7e8 1377 ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr);
1da177e4 1378
c720c7e8 1379 ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr);
1da177e4
LT		 1380
1381 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
1382
8292a17a 1383 inet_csk(newsk)->icsk_af_ops = &ipv6_mapped;
1da177e4 1384 newsk->sk_backlog_rcv = tcp_v4_do_rcv;
cfb6eeb4
YH		 1385#ifdef CONFIG_TCP_MD5SIG
1386 newtp->af_specific = &tcp_sock_ipv6_mapped_specific;
1387#endif
1388
676a1184
YZ		 1389 newnp->ipv6_ac_list = NULL;
1390 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1391 newnp->pktoptions = NULL;
1392 newnp->opt = NULL;
505cbfc5 1393 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1394 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4 1395
e6848976
ACM		 1396 /*
1397 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
1398 * here, tcp_create_openreq_child now does this for us, see the comment in
1399 * that function for the gory details. -acme
1da177e4 1400 */
1da177e4
LT		 1401
1402 /* It is tricky place. Until this moment IPv4 tcp
8292a17a 1403 worked with IPv6 icsk.icsk_af_ops.
1da177e4
LT		 1404 Sync it now.
1405 */
d83d8461 1406 tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
1da177e4
LT		 1407
1408 return newsk;
1409 }
1410
78d15e82 1411 treq = inet6_rsk(req);
1da177e4
LT		 1412 opt = np->opt;
1413
1414 if (sk_acceptq_is_full(sk))
1415 goto out_overflow;
1416
493f377d
DM		 1417 if (!dst) {
1418 dst = inet6_csk_route_req(sk, req);
1419 if (!dst)
1da177e4 1420 goto out;
1ab1457c 1421 }
1da177e4
LT		 1422
1423 newsk = tcp_create_openreq_child(sk, req, skb);
1424 if (newsk == NULL)
093d2823 1425 goto out_nonewsk;
1da177e4 1426
e6848976
ACM		 1427 /*
1428 * No need to charge this sock to the relevant IPv6 refcnt debug socks
1429 * count here, tcp_create_openreq_child now does this for us, see the
1430 * comment in that function for the gory details. -acme
1431 */
1da177e4 1432
59eed279 1433 newsk->sk_gso_type = SKB_GSO_TCPV6;
8e1ef0a9 1434 __ip6_dst_store(newsk, dst, NULL, NULL);
1da177e4
LT		 1435
1436 newtcp6sk = (struct tcp6_sock *)newsk;
1437 inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
1438
1439 newtp = tcp_sk(newsk);
1440 newinet = inet_sk(newsk);
1441 newnp = inet6_sk(newsk);
1442
1443 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
1444
2e6599cb
ACM		 1445 ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr);
1446 ipv6_addr_copy(&newnp->saddr, &treq->loc_addr);
1447 ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr);
1448 newsk->sk_bound_dev_if = treq->iif;
1da177e4 1449
1ab1457c 1450 /* Now IPv6 options...
1da177e4
LT		 1451
1452 First: no IPv4 options.
1453 */
f6d8bd05 1454 newinet->inet_opt = NULL;
676a1184 1455 newnp->ipv6_ac_list = NULL;
d35690be 1456 newnp->ipv6_fl_list = NULL;
1da177e4
LT		 1457
1458 /* Clone RX bits */
1459 newnp->rxopt.all = np->rxopt.all;
1460
1461 /* Clone pktoptions received with SYN */
1462 newnp->pktoptions = NULL;
2e6599cb
ACM		 1463 if (treq->pktopts != NULL) {
1464 newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC);
1465 kfree_skb(treq->pktopts);
1466 treq->pktopts = NULL;
1da177e4
LT		 1467 if (newnp->pktoptions)
1468 skb_set_owner_r(newnp->pktoptions, newsk);
1469 }
1470 newnp->opt = NULL;
505cbfc5 1471 newnp->mcast_oif = inet6_iif(skb);
0660e03f 1472 newnp->mcast_hops = ipv6_hdr(skb)->hop_limit;
1da177e4
LT		 1473
1474 /* Clone native IPv6 options from listening socket (if any)
1475
1476 Yes, keeping reference count would be much more clever,
1477 but we make one more one thing there: reattach optmem
1478 to newsk.
1479 */
1480 if (opt) {
1481 newnp->opt = ipv6_dup_options(newsk, opt);
1482 if (opt != np->opt)
1483 sock_kfree_s(sk, opt, opt->tot_len);
1484 }
1485
d83d8461 1486 inet_csk(newsk)->icsk_ext_hdr_len = 0;
1da177e4 1487 if (newnp->opt)
d83d8461
ACM		 1488 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
1489 newnp->opt->opt_flen);
1da177e4 1490
5d424d5a 1491 tcp_mtup_init(newsk);
1da177e4 1492 tcp_sync_mss(newsk, dst_mtu(dst));
0dbaee3b 1493 newtp->advmss = dst_metric_advmss(dst);
1da177e4 1494 tcp_initialize_rcv_mss(newsk);
9ad7c049
JC		 1495 if (tcp_rsk(req)->snt_synack)
1496 tcp_valid_rtt_meas(newsk,
1497 tcp_time_stamp - tcp_rsk(req)->snt_synack);
1498 newtp->total_retrans = req->retrans;
1da177e4 1499
c720c7e8
ED		 1500 newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6;
1501 newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
1da177e4 1502
cfb6eeb4
YH		 1503#ifdef CONFIG_TCP_MD5SIG
1504 /* Copy over the MD5 key from the original socket */
1505 if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) {
1506 /* We're using one, so create a matching key
1507 * on the newsk structure. If we fail to get
1508 * memory, then we end up not copying the key
1509 * across. Shucks.
1510 */
af879cc7
ACM		 1511 char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
1512 if (newkey != NULL)
e547bc1e 1513 tcp_v6_md5_do_add(newsk, &newnp->daddr,
cfb6eeb4 1514 newkey, key->keylen);
cfb6eeb4
YH		 1515 }
1516#endif
1517
093d2823
BS		 1518 if (__inet_inherit_port(sk, newsk) < 0) {
1519 sock_put(newsk);
1520 goto out;
1521 }
9327f705 1522 __inet6_hash(newsk, NULL);
1da177e4
LT		 1523
1524 return newsk;
1525
1526out_overflow:
de0744af 1527 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
093d2823 1528out_nonewsk:
1da177e4
LT		 1529 if (opt && opt != np->opt)
1530 sock_kfree_s(sk, opt, opt->tot_len);
1531 dst_release(dst);
093d2823
BS		 1532out:
1533 NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
1da177e4
LT		 1534 return NULL;
1535}
1536
b51655b9 1537static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
1da177e4 1538{
84fa7933 1539 if (skb->ip_summed == CHECKSUM_COMPLETE) {
684f2176 1540 if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
0660e03f 1541 &ipv6_hdr(skb)->daddr, skb->csum)) {
fb286bb2 1542 skb->ip_summed = CHECKSUM_UNNECESSARY;
1da177e4 1543 return 0;
fb286bb2 1544 }
1da177e4 1545 }
fb286bb2 1546
684f2176 1547 skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
0660e03f
ACM		 1548 &ipv6_hdr(skb)->saddr,
1549 &ipv6_hdr(skb)->daddr, 0));
fb286bb2 1550
1da177e4 1551 if (skb->len <= 76) {
fb286bb2 1552 return __skb_checksum_complete(skb);
1da177e4
LT		 1553 }
1554 return 0;
1555}
1556
1557/* The socket must have it's spinlock held when we get
1558 * here.
1559 *
1560 * We have a potential double-lock case here, so even when
1561 * doing backlog processing we use the BH locking scheme.
1562 * This is because we cannot sleep with the original spinlock
1563 * held.
1564 */
1565static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
1566{
1567 struct ipv6_pinfo *np = inet6_sk(sk);
1568 struct tcp_sock *tp;
1569 struct sk_buff *opt_skb = NULL;
1570
1571 /* Imagine: socket is IPv6. IPv4 packet arrives,
1572 goes to IPv4 receive handler and backlogged.
1573 From backlog it always goes here. Kerboom...
1574 Fortunately, tcp_rcv_established and rcv_established
1575 handle them correctly, but it is not case with
1576 tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK
1577 */
1578
1579 if (skb->protocol == htons(ETH_P_IP))
1580 return tcp_v4_do_rcv(sk, skb);
1581
cfb6eeb4
YH		 1582#ifdef CONFIG_TCP_MD5SIG
1583 if (tcp_v6_inbound_md5_hash (sk, skb))
1584 goto discard;
1585#endif
1586
fda9ef5d 1587 if (sk_filter(sk, skb))
1da177e4
LT		 1588 goto discard;
1589
1590 /*
1591 * socket locking is here for SMP purposes as backlog rcv
1592 * is currently called with bh processing disabled.
1593 */
1594
1595 /* Do Stevens' IPV6_PKTOPTIONS.
1596
1597 Yes, guys, it is the only place in our code, where we
1598 may make it not affecting IPv4.
1599 The rest of code is protocol independent,
1600 and I do not like idea to uglify IPv4.
1601
1602 Actually, all the idea behind IPV6_PKTOPTIONS
1603 looks not very well thought. For now we latch
1604 options, received in the last packet, enqueued
1605 by tcp. Feel free to propose better solution.
1ab1457c 1606 --ANK (980728)
1da177e4
LT		 1607 */
1608 if (np->rxopt.all)
1609 opt_skb = skb_clone(skb, GFP_ATOMIC);
1610
1611 if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
bdeab991 1612 sock_rps_save_rxhash(sk, skb);
aa8223c7 1613 if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len))
1da177e4 1614 goto reset;
1da177e4
LT		 1615 if (opt_skb)
1616 goto ipv6_pktoptions;
1617 return 0;
1618 }
1619
ab6a5bb6 1620 if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
1da177e4
LT		 1621 goto csum_err;
1622
1ab1457c 1623 if (sk->sk_state == TCP_LISTEN) {
1da177e4
LT		 1624 struct sock *nsk = tcp_v6_hnd_req(sk, skb);
1625 if (!nsk)
1626 goto discard;
1627
1628 /*
1629 * Queue it on the new socket if the new socket is active,
1630 * otherwise we just shortcircuit this and continue with
1631 * the new socket..
1632 */
1ab1457c 1633 if(nsk != sk) {
bdeab991 1634 sock_rps_save_rxhash(nsk, skb);
1da177e4
LT		 1635 if (tcp_child_process(sk, nsk, skb))
1636 goto reset;
1637 if (opt_skb)
1638 __kfree_skb(opt_skb);
1639 return 0;
1640 }
47482f13 1641 } else
bdeab991 1642 sock_rps_save_rxhash(sk, skb);
1da177e4 1643
aa8223c7 1644 if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len))
1da177e4 1645 goto reset;
1da177e4
LT		 1646 if (opt_skb)
1647 goto ipv6_pktoptions;
1648 return 0;
1649
1650reset:
cfb6eeb4 1651 tcp_v6_send_reset(sk, skb);
1da177e4
LT		 1652discard:
1653 if (opt_skb)
1654 __kfree_skb(opt_skb);
1655 kfree_skb(skb);
1656 return 0;
1657csum_err:
63231bdd 1658 TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS);
1da177e4
LT		 1659 goto discard;
1660
1661
1662ipv6_pktoptions:
1663 /* Do you ask, what is it?
1664
1665 1. skb was enqueued by tcp.
1666 2. skb is added to tail of read queue, rather than out of order.
1667 3. socket is not in passive state.
1668 4. Finally, it really contains options, which user wants to receive.
1669 */
1670 tp = tcp_sk(sk);
1671 if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt &&
1672 !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
333fad53 1673 if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo)
505cbfc5 1674 np->mcast_oif = inet6_iif(opt_skb);
333fad53 1675 if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
0660e03f 1676 np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
1da177e4
LT		 1677 if (ipv6_opt_accepted(sk, opt_skb)) {
1678 skb_set_owner_r(opt_skb, sk);
1679 opt_skb = xchg(&np->pktoptions, opt_skb);
1680 } else {
1681 __kfree_skb(opt_skb);
1682 opt_skb = xchg(&np->pktoptions, NULL);
1683 }
1684 }
1685
800d55f1 1686 kfree_skb(opt_skb);
1da177e4
LT		 1687 return 0;
1688}
1689
e5bbef20 1690static int tcp_v6_rcv(struct sk_buff *skb)
1da177e4 1691{
cf533ea5 1692 const struct tcphdr *th;
b71d1d42 1693 const struct ipv6hdr *hdr;
1da177e4
LT		 1694 struct sock *sk;
1695 int ret;
a86b1e30 1696 struct net *net = dev_net(skb->dev);
1da177e4
LT		 1697
1698 if (skb->pkt_type != PACKET_HOST)
1699 goto discard_it;
1700
1701 /*
1702 * Count it even if it's bad.
1703 */
63231bdd 1704 TCP_INC_STATS_BH(net, TCP_MIB_INSEGS);
1da177e4
LT		 1705
1706 if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
1707 goto discard_it;
1708
aa8223c7 1709 th = tcp_hdr(skb);
1da177e4
LT		 1710
1711 if (th->doff < sizeof(struct tcphdr)/4)
1712 goto bad_packet;
1713 if (!pskb_may_pull(skb, th->doff*4))
1714 goto discard_it;
1715
60476372 1716 if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb))
1da177e4
LT		 1717 goto bad_packet;
1718
aa8223c7 1719 th = tcp_hdr(skb);
e802af9c 1720 hdr = ipv6_hdr(skb);
1da177e4
LT		 1721 TCP_SKB_CB(skb)->seq = ntohl(th->seq);
1722 TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
1723 skb->len - th->doff*4);
1724 TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
1725 TCP_SKB_CB(skb)->when = 0;
b82d1bb4 1726 TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
1da177e4
LT		 1727 TCP_SKB_CB(skb)->sacked = 0;
1728
9a1f27c4 1729 sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest);
1da177e4
LT		 1730 if (!sk)
1731 goto no_tcp_socket;
1732
1733process:
1734 if (sk->sk_state == TCP_TIME_WAIT)
1735 goto do_time_wait;
1736
e802af9c
SH		 1737 if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
1738 NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
1739 goto discard_and_relse;
1740 }
1741
1da177e4
LT		 1742 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1743 goto discard_and_relse;
1744
fda9ef5d 1745 if (sk_filter(sk, skb))
1da177e4
LT		 1746 goto discard_and_relse;
1747
1748 skb->dev = NULL;
1749
293b9c42 1750 bh_lock_sock_nested(sk);
1da177e4
LT		 1751 ret = 0;
1752 if (!sock_owned_by_user(sk)) {
1a2449a8 1753#ifdef CONFIG_NET_DMA
1ab1457c 1754 struct tcp_sock *tp = tcp_sk(sk);
b4caea8a 1755 if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list)
f67b4599 1756 tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY);
1ab1457c
YH		 1757 if (tp->ucopy.dma_chan)
1758 ret = tcp_v6_do_rcv(sk, skb);
1759 else
1a2449a8
CL		 1760#endif
1761 {
1762 if (!tcp_prequeue(sk, skb))
1763 ret = tcp_v6_do_rcv(sk, skb);
1764 }
6cce09f8 1765 } else if (unlikely(sk_add_backlog(sk, skb))) {
6b03a53a 1766 bh_unlock_sock(sk);
6cce09f8 1767 NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP);
6b03a53a
ZY		 1768 goto discard_and_relse;
1769 }
1da177e4
LT		 1770 bh_unlock_sock(sk);
1771
1772 sock_put(sk);
1773 return ret ? -1 : 0;
1774
1775no_tcp_socket:
1776 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1777 goto discard_it;
1778
1779 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
1780bad_packet:
63231bdd 1781 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
1da177e4 1782 } else {
cfb6eeb4 1783 tcp_v6_send_reset(NULL, skb);
1da177e4
LT		 1784 }
1785
1786discard_it:
1787
1788 /*
1789 * Discard frame
1790 */
1791
1792 kfree_skb(skb);
1793 return 0;
1794
1795discard_and_relse:
1796 sock_put(sk);
1797 goto discard_it;
1798
1799do_time_wait:
1800 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
9469c7b4 1801 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1802 goto discard_it;
1803 }
1804
1805 if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
63231bdd 1806 TCP_INC_STATS_BH(net, TCP_MIB_INERRS);
9469c7b4 1807 inet_twsk_put(inet_twsk(sk));
1da177e4
LT		 1808 goto discard_it;
1809 }
1810
9469c7b4 1811 switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
1da177e4
LT		 1812 case TCP_TW_SYN:
1813 {
1814 struct sock *sk2;
1815
c346dca1 1816 sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo,
0660e03f 1817 &ipv6_hdr(skb)->daddr,
505cbfc5 1818 ntohs(th->dest), inet6_iif(skb));
1da177e4 1819 if (sk2 != NULL) {
295ff7ed
ACM		 1820 struct inet_timewait_sock *tw = inet_twsk(sk);
1821 inet_twsk_deschedule(tw, &tcp_death_row);
1822 inet_twsk_put(tw);
1da177e4
LT		 1823 sk = sk2;
1824 goto process;
1825 }
1826 /* Fall through to ACK */
1827 }
1828 case TCP_TW_ACK:
1829 tcp_v6_timewait_ack(sk, skb);
1830 break;
1831 case TCP_TW_RST:
1832 goto no_tcp_socket;
1833 case TCP_TW_SUCCESS:;
1834 }
1835 goto discard_it;
1836}
1837
ccb7c410
DM		 1838static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it)
1839{
db3949c4
DM		 1840 struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk);
1841 struct ipv6_pinfo *np = inet6_sk(sk);
1842 struct inet_peer *peer;
1843
1844 if (!rt ||
1845 !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) {
1846 peer = inet_getpeer_v6(&np->daddr, 1);
1847 *release_it = true;
1848 } else {
1849 if (!rt->rt6i_peer)
1850 rt6_bind_peer(rt, 1);
1851 peer = rt->rt6i_peer;
457de438 1852 *release_it = false;
db3949c4
DM		 1853 }
1854
1855 return peer;
ccb7c410
DM		 1856}
1857
1858static void *tcp_v6_tw_get_peer(struct sock *sk)
1da177e4 1859{
cf533ea5
ED		 1860 const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
1861 const struct inet_timewait_sock *tw = inet_twsk(sk);
ccb7c410
DM		 1862
1863 if (tw->tw_family == AF_INET)
1864 return tcp_v4_tw_get_peer(sk);
1865
db3949c4 1866 return inet_getpeer_v6(&tw6->tw_v6_daddr, 1);
1da177e4
LT		 1867}
1868
ccb7c410
DM		 1869static struct timewait_sock_ops tcp6_timewait_sock_ops = {
1870 .twsk_obj_size = sizeof(struct tcp6_timewait_sock),
1871 .twsk_unique = tcp_twsk_unique,
1872 .twsk_destructor= tcp_twsk_destructor,
1873 .twsk_getpeer = tcp_v6_tw_get_peer,
1874};
1875
3b401a81 1876static const struct inet_connection_sock_af_ops ipv6_specific = {
543d9cfe
ACM		 1877 .queue_xmit = inet6_csk_xmit,
1878 .send_check = tcp_v6_send_check,
1879 .rebuild_header = inet6_sk_rebuild_header,
1880 .conn_request = tcp_v6_conn_request,
1881 .syn_recv_sock = tcp_v6_syn_recv_sock,
3f419d2d 1882 .get_peer = tcp_v6_get_peer,
543d9cfe
ACM		 1883 .net_header_len = sizeof(struct ipv6hdr),
1884 .setsockopt = ipv6_setsockopt,
1885 .getsockopt = ipv6_getsockopt,
1886 .addr2sockaddr = inet6_csk_addr2sockaddr,
1887 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1888 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1889#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1890 .compat_setsockopt = compat_ipv6_setsockopt,
1891 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1892#endif
1da177e4
LT		 1893};
1894
cfb6eeb4 1895#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 1896static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
cfb6eeb4 1897 .md5_lookup = tcp_v6_md5_lookup,
49a72dfb 1898 .calc_md5_hash = tcp_v6_md5_hash_skb,
cfb6eeb4
YH		 1899 .md5_add = tcp_v6_md5_add_func,
1900 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1901};
a928630a 1902#endif
cfb6eeb4 1903
1da177e4
LT		 1904/*
1905 * TCP over IPv4 via INET6 API
1906 */
1907
3b401a81 1908static const struct inet_connection_sock_af_ops ipv6_mapped = {
543d9cfe
ACM		 1909 .queue_xmit = ip_queue_xmit,
1910 .send_check = tcp_v4_send_check,
1911 .rebuild_header = inet_sk_rebuild_header,
1912 .conn_request = tcp_v6_conn_request,
1913 .syn_recv_sock = tcp_v6_syn_recv_sock,
3f419d2d 1914 .get_peer = tcp_v4_get_peer,
543d9cfe
ACM		 1915 .net_header_len = sizeof(struct iphdr),
1916 .setsockopt = ipv6_setsockopt,
1917 .getsockopt = ipv6_getsockopt,
1918 .addr2sockaddr = inet6_csk_addr2sockaddr,
1919 .sockaddr_len = sizeof(struct sockaddr_in6),
ab1e0a13 1920 .bind_conflict = inet6_csk_bind_conflict,
3fdadf7d 1921#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1922 .compat_setsockopt = compat_ipv6_setsockopt,
1923 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1924#endif
1da177e4
LT		 1925};
1926
cfb6eeb4 1927#ifdef CONFIG_TCP_MD5SIG
b2e4b3de 1928static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
cfb6eeb4 1929 .md5_lookup = tcp_v4_md5_lookup,
49a72dfb 1930 .calc_md5_hash = tcp_v4_md5_hash_skb,
cfb6eeb4
YH		 1931 .md5_add = tcp_v6_md5_add_func,
1932 .md5_parse = tcp_v6_parse_md5_keys,
cfb6eeb4 1933};
a928630a 1934#endif
cfb6eeb4 1935
1da177e4
LT		 1936/* NOTE: A lot of things set to zero explicitly by call to
1937 * sk_alloc() so need not be done here.
1938 */
1939static int tcp_v6_init_sock(struct sock *sk)
1940{
6687e988 1941 struct inet_connection_sock *icsk = inet_csk(sk);
1da177e4
LT		 1942 struct tcp_sock *tp = tcp_sk(sk);
1943
1944 skb_queue_head_init(&tp->out_of_order_queue);
1945 tcp_init_xmit_timers(sk);
1946 tcp_prequeue_init(tp);
1947
6687e988 1948 icsk->icsk_rto = TCP_TIMEOUT_INIT;
1da177e4
LT		 1949 tp->mdev = TCP_TIMEOUT_INIT;
1950
1951 /* So many TCP implementations out there (incorrectly) count the
1952 * initial SYN frame in their delayed-ACK and congestion control
1953 * algorithms that we must have the following bandaid to talk
1954 * efficiently to them. -DaveM
1955 */
1956 tp->snd_cwnd = 2;
1957
1958 /* See draft-stevens-tcpca-spec-01 for discussion of the
1959 * initialization of these values.
1960 */
0b6a05c1 1961 tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
1da177e4 1962 tp->snd_cwnd_clamp = ~0;
bee7ca9e 1963 tp->mss_cache = TCP_MSS_DEFAULT;
1da177e4
LT		 1964
1965 tp->reordering = sysctl_tcp_reordering;
1966
1967 sk->sk_state = TCP_CLOSE;
1968
8292a17a 1969 icsk->icsk_af_ops = &ipv6_specific;
6687e988 1970 icsk->icsk_ca_ops = &tcp_init_congestion_ops;
d83d8461 1971 icsk->icsk_sync_mss = tcp_sync_mss;
1da177e4
LT		 1972 sk->sk_write_space = sk_stream_write_space;
1973 sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
1974
cfb6eeb4
YH		 1975#ifdef CONFIG_TCP_MD5SIG
1976 tp->af_specific = &tcp_sock_ipv6_specific;
1977#endif
1978
435cf559
WAS		 1979 /* TCP Cookie Transactions */
1980 if (sysctl_tcp_cookie_size > 0) {
1981 /* Default, cookies without s_data_payload. */
1982 tp->cookie_values =
1983 kzalloc(sizeof(*tp->cookie_values),
1984 sk->sk_allocation);
1985 if (tp->cookie_values != NULL)
1986 kref_init(&tp->cookie_values->kref);
1987 }
1988 /* Presumed zeroed, in order of appearance:
1989 * cookie_in_always, cookie_out_never,
1990 * s_data_constant, s_data_in, s_data_out
1991 */
1da177e4
LT		 1992 sk->sk_sndbuf = sysctl_tcp_wmem[1];
1993 sk->sk_rcvbuf = sysctl_tcp_rmem[1];
1994
eb4dea58 1995 local_bh_disable();
1748376b 1996 percpu_counter_inc(&tcp_sockets_allocated);
eb4dea58 1997 local_bh_enable();
1da177e4
LT		 1998
1999 return 0;
2000}
2001
7d06b2e0 2002static void tcp_v6_destroy_sock(struct sock *sk)
1da177e4 2003{
cfb6eeb4
YH		 2004#ifdef CONFIG_TCP_MD5SIG
2005 /* Clean up the MD5 key list */
2006 if (tcp_sk(sk)->md5sig_info)
2007 tcp_v6_clear_md5_list(sk);
2008#endif
1da177e4 2009 tcp_v4_destroy_sock(sk);
7d06b2e0 2010 inet6_destroy_sock(sk);
1da177e4
LT		 2011}
2012
952a10be 2013#ifdef CONFIG_PROC_FS
1da177e4 2014/* Proc filesystem TCPv6 sock list dumping. */
1ab1457c 2015static void get_openreq6(struct seq_file *seq,
cf533ea5 2016 const struct sock *sk, struct request_sock *req, int i, int uid)
1da177e4 2017{
1da177e4 2018 int ttd = req->expires - jiffies;
b71d1d42
ED		 2019 const struct in6_addr *src = &inet6_rsk(req)->loc_addr;
2020 const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
1da177e4
LT		 2021
2022 if (ttd < 0)
2023 ttd = 0;
2024
1da177e4
LT		 2025 seq_printf(seq,
2026 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2027 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1da177e4
LT		 2028 i,
2029 src->s6_addr32[0], src->s6_addr32[1],
2030 src->s6_addr32[2], src->s6_addr32[3],
fd507037 2031 ntohs(inet_rsk(req)->loc_port),
1da177e4
LT		 2032 dest->s6_addr32[0], dest->s6_addr32[1],
2033 dest->s6_addr32[2], dest->s6_addr32[3],
2e6599cb 2034 ntohs(inet_rsk(req)->rmt_port),
1da177e4
LT		 2035 TCP_SYN_RECV,
2036 0,0, /* could print option size, but that is af dependent. */
1ab1457c
YH		 2037 1, /* timers active (only the expire timer) */
2038 jiffies_to_clock_t(ttd),
1da177e4
LT		 2039 req->retrans,
2040 uid,
1ab1457c 2041 0, /* non standard timer */
1da177e4
LT		 2042 0, /* open_requests have no inode */
2043 0, req);
2044}
2045
2046static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
2047{
b71d1d42 2048 const struct in6_addr *dest, *src;
1da177e4
LT		 2049 __u16 destp, srcp;
2050 int timer_active;
2051 unsigned long timer_expires;
cf533ea5
ED		 2052 const struct inet_sock *inet = inet_sk(sp);
2053 const struct tcp_sock *tp = tcp_sk(sp);
463c84b9 2054 const struct inet_connection_sock *icsk = inet_csk(sp);
cf533ea5 2055 const struct ipv6_pinfo *np = inet6_sk(sp);
1da177e4
LT		 2056
2057 dest = &np->daddr;
2058 src = &np->rcv_saddr;
c720c7e8
ED		 2059 destp = ntohs(inet->inet_dport);
2060 srcp = ntohs(inet->inet_sport);
463c84b9
ACM		 2061
2062 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
1da177e4 2063 timer_active = 1;
463c84b9
ACM		 2064 timer_expires = icsk->icsk_timeout;
2065 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
1da177e4 2066 timer_active = 4;
463c84b9 2067 timer_expires = icsk->icsk_timeout;
1da177e4
LT		 2068 } else if (timer_pending(&sp->sk_timer)) {
2069 timer_active = 2;
2070 timer_expires = sp->sk_timer.expires;
2071 } else {
2072 timer_active = 0;
2073 timer_expires = jiffies;
2074 }
2075
2076 seq_printf(seq,
2077 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2078 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n",
1da177e4
LT		 2079 i,
2080 src->s6_addr32[0], src->s6_addr32[1],
2081 src->s6_addr32[2], src->s6_addr32[3], srcp,
2082 dest->s6_addr32[0], dest->s6_addr32[1],
2083 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1ab1457c 2084 sp->sk_state,
47da8ee6
SS		 2085 tp->write_seq-tp->snd_una,
2086 (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq),
1da177e4
LT		 2087 timer_active,
2088 jiffies_to_clock_t(timer_expires - jiffies),
463c84b9 2089 icsk->icsk_retransmits,
1da177e4 2090 sock_i_uid(sp),
6687e988 2091 icsk->icsk_probes_out,
1da177e4
LT		 2092 sock_i_ino(sp),
2093 atomic_read(&sp->sk_refcnt), sp,
7be87351
SH		 2094 jiffies_to_clock_t(icsk->icsk_rto),
2095 jiffies_to_clock_t(icsk->icsk_ack.ato),
463c84b9 2096 (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong,
0b6a05c1
IJ		 2097 tp->snd_cwnd,
2098 tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh
1da177e4
LT		 2099 );
2100}
2101
1ab1457c 2102static void get_timewait6_sock(struct seq_file *seq,
8feaf0c0 2103 struct inet_timewait_sock *tw, int i)
1da177e4 2104{
b71d1d42 2105 const struct in6_addr *dest, *src;
1da177e4 2106 __u16 destp, srcp;
cf533ea5 2107 const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
1da177e4
LT		 2108 int ttd = tw->tw_ttd - jiffies;
2109
2110 if (ttd < 0)
2111 ttd = 0;
2112
0fa1a53e
ACM		 2113 dest = &tw6->tw_v6_daddr;
2114 src = &tw6->tw_v6_rcv_saddr;
1da177e4
LT		 2115 destp = ntohs(tw->tw_dport);
2116 srcp = ntohs(tw->tw_sport);
2117
2118 seq_printf(seq,
2119 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
71338aa7 2120 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n",
1da177e4
LT		 2121 i,
2122 src->s6_addr32[0], src->s6_addr32[1],
2123 src->s6_addr32[2], src->s6_addr32[3], srcp,
2124 dest->s6_addr32[0], dest->s6_addr32[1],
2125 dest->s6_addr32[2], dest->s6_addr32[3], destp,
2126 tw->tw_substate, 0, 0,
2127 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0,
2128 atomic_read(&tw->tw_refcnt), tw);
2129}
2130
1da177e4
LT		 2131static int tcp6_seq_show(struct seq_file *seq, void *v)
2132{
2133 struct tcp_iter_state *st;
2134
2135 if (v == SEQ_START_TOKEN) {
2136 seq_puts(seq,
2137 " sl "
2138 "local_address "
2139 "remote_address "
2140 "st tx_queue rx_queue tr tm->when retrnsmt"
2141 " uid timeout inode\n");
2142 goto out;
2143 }
2144 st = seq->private;
2145
2146 switch (st->state) {
2147 case TCP_SEQ_STATE_LISTENING:
2148 case TCP_SEQ_STATE_ESTABLISHED:
2149 get_tcp6_sock(seq, v, st->num);
2150 break;
2151 case TCP_SEQ_STATE_OPENREQ:
2152 get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
2153 break;
2154 case TCP_SEQ_STATE_TIME_WAIT:
2155 get_timewait6_sock(seq, v, st->num);
2156 break;
2157 }
2158out:
2159 return 0;
2160}
2161
1da177e4 2162static struct tcp_seq_afinfo tcp6_seq_afinfo = {
1da177e4
LT		 2163 .name = "tcp6",
2164 .family = AF_INET6,
5f4472c5
DL		 2165 .seq_fops = {
2166 .owner = THIS_MODULE,
2167 },
9427c4b3
DL		 2168 .seq_ops = {
2169 .show = tcp6_seq_show,
2170 },
1da177e4
LT		 2171};
2172
2c8c1e72 2173int __net_init tcp6_proc_init(struct net *net)
1da177e4 2174{
6f8b13bc 2175 return tcp_proc_register(net, &tcp6_seq_afinfo);
1da177e4
LT		 2176}
2177
6f8b13bc 2178void tcp6_proc_exit(struct net *net)
1da177e4 2179{
6f8b13bc 2180 tcp_proc_unregister(net, &tcp6_seq_afinfo);
1da177e4
LT		 2181}
2182#endif
2183
2184struct proto tcpv6_prot = {
2185 .name = "TCPv6",
2186 .owner = THIS_MODULE,
2187 .close = tcp_close,
2188 .connect = tcp_v6_connect,
2189 .disconnect = tcp_disconnect,
463c84b9 2190 .accept = inet_csk_accept,
1da177e4
LT		 2191 .ioctl = tcp_ioctl,
2192 .init = tcp_v6_init_sock,
2193 .destroy = tcp_v6_destroy_sock,
2194 .shutdown = tcp_shutdown,
2195 .setsockopt = tcp_setsockopt,
2196 .getsockopt = tcp_getsockopt,
1da177e4 2197 .recvmsg = tcp_recvmsg,
7ba42910
CG		 2198 .sendmsg = tcp_sendmsg,
2199 .sendpage = tcp_sendpage,
1da177e4
LT		 2200 .backlog_rcv = tcp_v6_do_rcv,
2201 .hash = tcp_v6_hash,
ab1e0a13
ACM		 2202 .unhash = inet_unhash,
2203 .get_port = inet_csk_get_port,
1da177e4
LT		 2204 .enter_memory_pressure = tcp_enter_memory_pressure,
2205 .sockets_allocated = &tcp_sockets_allocated,
2206 .memory_allocated = &tcp_memory_allocated,
2207 .memory_pressure = &tcp_memory_pressure,
0a5578cf 2208 .orphan_count = &tcp_orphan_count,
1da177e4
LT		 2209 .sysctl_mem = sysctl_tcp_mem,
2210 .sysctl_wmem = sysctl_tcp_wmem,
2211 .sysctl_rmem = sysctl_tcp_rmem,
2212 .max_header = MAX_TCP_HEADER,
2213 .obj_size = sizeof(struct tcp6_sock),
3ab5aee7 2214 .slab_flags = SLAB_DESTROY_BY_RCU,
6d6ee43e 2215 .twsk_prot = &tcp6_timewait_sock_ops,
60236fdd 2216 .rsk_prot = &tcp6_request_sock_ops,
39d8cda7 2217 .h.hashinfo = &tcp_hashinfo,
7ba42910 2218 .no_autobind = true,
543d9cfe
ACM		 2219#ifdef CONFIG_COMPAT
2220 .compat_setsockopt = compat_tcp_setsockopt,
2221 .compat_getsockopt = compat_tcp_getsockopt,
2222#endif
1da177e4
LT		 2223};
2224
41135cc8 2225static const struct inet6_protocol tcpv6_protocol = {
1da177e4
LT		 2226 .handler = tcp_v6_rcv,
2227 .err_handler = tcp_v6_err,
a430a43d 2228 .gso_send_check = tcp_v6_gso_send_check,
adcfc7d0 2229 .gso_segment = tcp_tso_segment,
684f2176
HX		 2230 .gro_receive = tcp6_gro_receive,
2231 .gro_complete = tcp6_gro_complete,
1da177e4
LT		 2232 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
2233};
2234
1da177e4
LT		 2235static struct inet_protosw tcpv6_protosw = {
2236 .type = SOCK_STREAM,
2237 .protocol = IPPROTO_TCP,
2238 .prot = &tcpv6_prot,
2239 .ops = &inet6_stream_ops,
1da177e4 2240 .no_check = 0,
d83d8461
ACM		 2241 .flags = INET_PROTOSW_PERMANENT |
2242 INET_PROTOSW_ICSK,
1da177e4
LT		 2243};
2244
2c8c1e72 2245static int __net_init tcpv6_net_init(struct net *net)
93ec926b 2246{
5677242f
DL		 2247 return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6,
2248 SOCK_RAW, IPPROTO_TCP, net);
93ec926b
DL		 2249}
2250
2c8c1e72 2251static void __net_exit tcpv6_net_exit(struct net *net)
93ec926b 2252{
5677242f 2253 inet_ctl_sock_destroy(net->ipv6.tcp_sk);
b099ce26
EB		 2254}
2255
2c8c1e72 2256static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list)
b099ce26
EB		 2257{
2258 inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6);
93ec926b
DL		 2259}
2260
2261static struct pernet_operations tcpv6_net_ops = {
b099ce26
EB		 2262 .init = tcpv6_net_init,
2263 .exit = tcpv6_net_exit,
2264 .exit_batch = tcpv6_net_exit_batch,
93ec926b
DL		 2265};
2266
7f4e4868 2267int __init tcpv6_init(void)
1da177e4 2268{
7f4e4868
DL		 2269 int ret;
2270
2271 ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP);
2272 if (ret)
2273 goto out;
2274
1da177e4 2275 /* register inet6 protocol */
7f4e4868
DL		 2276 ret = inet6_register_protosw(&tcpv6_protosw);
2277 if (ret)
2278 goto out_tcpv6_protocol;
2279
93ec926b 2280 ret = register_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2281 if (ret)
2282 goto out_tcpv6_protosw;
2283out:
2284 return ret;
ae0f7d5f 2285
7f4e4868
DL		 2286out_tcpv6_protocol:
2287 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
2288out_tcpv6_protosw:
2289 inet6_unregister_protosw(&tcpv6_protosw);
2290 goto out;
2291}
2292
09f7709f 2293void tcpv6_exit(void)
7f4e4868 2294{
93ec926b 2295 unregister_pernet_subsys(&tcpv6_net_ops);
7f4e4868
DL		 2296 inet6_unregister_protosw(&tcpv6_protosw);
2297 inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP);
1da177e4 2298}
Linux 6.x block layer and io_uring tree(s)