Commit | Line | Data |
---|---|---|
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> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
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> |
3d58b5fa | 62 | #include <net/inet_common.h> |
6e5714ea | 63 | #include <net/secure_seq.h> |
076bb0c8 | 64 | #include <net/busy_poll.h> |
1da177e4 | 65 | |
1da177e4 LT |
66 | #include <linux/proc_fs.h> |
67 | #include <linux/seq_file.h> | |
68 | ||
cf80e0e4 | 69 | #include <crypto/hash.h> |
cfb6eeb4 YH |
70 | #include <linux/scatterlist.h> |
71 | ||
a00e7444 ED |
72 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb); |
73 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
6edafaaf | 74 | struct request_sock *req); |
1da177e4 LT |
75 | |
76 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 77 | |
3b401a81 SH |
78 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
79 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 80 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
81 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 | 83 | #else |
51723935 | 84 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 85 | const struct in6_addr *addr) |
9501f972 YH |
86 | { |
87 | return NULL; | |
88 | } | |
a928630a | 89 | #endif |
1da177e4 | 90 | |
fae6ef87 NC |
91 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
92 | { | |
93 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 94 | |
5037e9ef | 95 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
96 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
97 | ||
ca777eff ED |
98 | sk->sk_rx_dst = dst; |
99 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
b197df4f | 100 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 101 | } |
fae6ef87 NC |
102 | } |
103 | ||
cf533ea5 | 104 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 105 | { |
0660e03f ACM |
106 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
107 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
108 | tcp_hdr(skb)->dest, |
109 | tcp_hdr(skb)->source); | |
1da177e4 LT |
110 | } |
111 | ||
1ab1457c | 112 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
113 | int addr_len) |
114 | { | |
115 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 116 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 117 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
118 | struct ipv6_pinfo *np = inet6_sk(sk); |
119 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 120 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 121 | struct ipv6_txoptions *opt; |
4c9483b2 | 122 | struct flowi6 fl6; |
1da177e4 LT |
123 | struct dst_entry *dst; |
124 | int addr_type; | |
125 | int err; | |
126 | ||
1ab1457c | 127 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
128 | return -EINVAL; |
129 | ||
1ab1457c | 130 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 131 | return -EAFNOSUPPORT; |
1da177e4 | 132 | |
4c9483b2 | 133 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
134 | |
135 | if (np->sndflow) { | |
4c9483b2 DM |
136 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
137 | IP6_ECN_flow_init(fl6.flowlabel); | |
138 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 139 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 140 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 141 | if (!flowlabel) |
1da177e4 | 142 | return -EINVAL; |
1da177e4 LT |
143 | fl6_sock_release(flowlabel); |
144 | } | |
145 | } | |
146 | ||
147 | /* | |
1ab1457c YH |
148 | * connect() to INADDR_ANY means loopback (BSD'ism). |
149 | */ | |
150 | ||
4c99aa40 | 151 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 152 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
153 | |
154 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
155 | ||
4c99aa40 | 156 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
157 | return -ENETUNREACH; |
158 | ||
159 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
160 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
161 | usin->sin6_scope_id) { | |
162 | /* If interface is set while binding, indices | |
163 | * must coincide. | |
164 | */ | |
165 | if (sk->sk_bound_dev_if && | |
166 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
167 | return -EINVAL; | |
168 | ||
169 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
170 | } | |
171 | ||
172 | /* Connect to link-local address requires an interface */ | |
173 | if (!sk->sk_bound_dev_if) | |
174 | return -EINVAL; | |
175 | } | |
176 | ||
177 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 178 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
179 | tp->rx_opt.ts_recent = 0; |
180 | tp->rx_opt.ts_recent_stamp = 0; | |
181 | tp->write_seq = 0; | |
182 | } | |
183 | ||
efe4208f | 184 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 185 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
186 | |
187 | /* | |
188 | * TCP over IPv4 | |
189 | */ | |
190 | ||
191 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 192 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
193 | struct sockaddr_in sin; |
194 | ||
195 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
196 | ||
197 | if (__ipv6_only_sock(sk)) | |
198 | return -ENETUNREACH; | |
199 | ||
200 | sin.sin_family = AF_INET; | |
201 | sin.sin_port = usin->sin6_port; | |
202 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
203 | ||
d83d8461 | 204 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 205 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
206 | #ifdef CONFIG_TCP_MD5SIG |
207 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
208 | #endif | |
1da177e4 LT |
209 | |
210 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
211 | ||
212 | if (err) { | |
d83d8461 ACM |
213 | icsk->icsk_ext_hdr_len = exthdrlen; |
214 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 215 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
216 | #ifdef CONFIG_TCP_MD5SIG |
217 | tp->af_specific = &tcp_sock_ipv6_specific; | |
218 | #endif | |
1da177e4 | 219 | goto failure; |
1da177e4 | 220 | } |
d1e559d0 | 221 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
222 | |
223 | return err; | |
224 | } | |
225 | ||
efe4208f ED |
226 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
227 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 228 | |
4c9483b2 | 229 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 230 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 231 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
232 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
233 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
234 | fl6.fl6_dport = usin->sin6_port; |
235 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 236 | |
1e1d04e6 | 237 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 238 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 239 | |
4c9483b2 | 240 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 241 | |
0e0d44ab | 242 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
243 | if (IS_ERR(dst)) { |
244 | err = PTR_ERR(dst); | |
1da177e4 | 245 | goto failure; |
14e50e57 | 246 | } |
1da177e4 | 247 | |
63159f29 | 248 | if (!saddr) { |
4c9483b2 | 249 | saddr = &fl6.saddr; |
efe4208f | 250 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
251 | } |
252 | ||
253 | /* set the source address */ | |
4e3fd7a0 | 254 | np->saddr = *saddr; |
c720c7e8 | 255 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 256 | |
f83ef8c0 | 257 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 258 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 259 | |
493f377d DM |
260 | if (tcp_death_row.sysctl_tw_recycle && |
261 | !tp->rx_opt.ts_recent_stamp && | |
fd0273d7 | 262 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr)) |
81166dd6 | 263 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 264 | |
d83d8461 | 265 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
266 | if (opt) |
267 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
268 | opt->opt_nflen; | |
1da177e4 LT |
269 | |
270 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
271 | ||
c720c7e8 | 272 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
273 | |
274 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 275 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
276 | if (err) |
277 | goto late_failure; | |
278 | ||
877d1f62 | 279 | sk_set_txhash(sk); |
9e7ceb06 | 280 | |
2b916477 | 281 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 282 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 283 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
284 | inet->inet_sport, |
285 | inet->inet_dport); | |
1da177e4 LT |
286 | |
287 | err = tcp_connect(sk); | |
288 | if (err) | |
289 | goto late_failure; | |
290 | ||
291 | return 0; | |
292 | ||
293 | late_failure: | |
294 | tcp_set_state(sk, TCP_CLOSE); | |
295 | __sk_dst_reset(sk); | |
296 | failure: | |
c720c7e8 | 297 | inet->inet_dport = 0; |
1da177e4 LT |
298 | sk->sk_route_caps = 0; |
299 | return err; | |
300 | } | |
301 | ||
563d34d0 ED |
302 | static void tcp_v6_mtu_reduced(struct sock *sk) |
303 | { | |
304 | struct dst_entry *dst; | |
305 | ||
306 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
307 | return; | |
308 | ||
309 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
310 | if (!dst) | |
311 | return; | |
312 | ||
313 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
314 | tcp_sync_mss(sk, dst_mtu(dst)); | |
315 | tcp_simple_retransmit(sk); | |
316 | } | |
317 | } | |
318 | ||
1da177e4 | 319 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 320 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 321 | { |
4c99aa40 | 322 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 323 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
324 | struct net *net = dev_net(skb->dev); |
325 | struct request_sock *fastopen; | |
1da177e4 | 326 | struct ipv6_pinfo *np; |
1ab1457c | 327 | struct tcp_sock *tp; |
0a672f74 | 328 | __u32 seq, snd_una; |
2215089b | 329 | struct sock *sk; |
9cf74903 | 330 | bool fatal; |
2215089b | 331 | int err; |
1da177e4 | 332 | |
2215089b ED |
333 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
334 | &hdr->daddr, th->dest, | |
335 | &hdr->saddr, ntohs(th->source), | |
336 | skb->dev->ifindex); | |
1da177e4 | 337 | |
2215089b | 338 | if (!sk) { |
a16292a0 ED |
339 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
340 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
341 | return; |
342 | } | |
343 | ||
344 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 345 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
346 | return; |
347 | } | |
2215089b | 348 | seq = ntohl(th->seq); |
9cf74903 | 349 | fatal = icmpv6_err_convert(type, code, &err); |
2215089b | 350 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
9cf74903 | 351 | return tcp_req_err(sk, seq, fatal); |
1da177e4 LT |
352 | |
353 | bh_lock_sock(sk); | |
563d34d0 | 354 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 355 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
356 | |
357 | if (sk->sk_state == TCP_CLOSE) | |
358 | goto out; | |
359 | ||
e802af9c | 360 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 361 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
362 | goto out; |
363 | } | |
364 | ||
1da177e4 | 365 | tp = tcp_sk(sk); |
0a672f74 YC |
366 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
367 | fastopen = tp->fastopen_rsk; | |
368 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 369 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 370 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 371 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
372 | goto out; |
373 | } | |
374 | ||
375 | np = inet6_sk(sk); | |
376 | ||
ec18d9a2 DM |
377 | if (type == NDISC_REDIRECT) { |
378 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
379 | ||
1ed5c48f | 380 | if (dst) |
6700c270 | 381 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 382 | goto out; |
ec18d9a2 DM |
383 | } |
384 | ||
1da177e4 | 385 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
386 | /* We are not interested in TCP_LISTEN and open_requests |
387 | * (SYN-ACKs send out by Linux are always <576bytes so | |
388 | * they should go through unfragmented). | |
389 | */ | |
390 | if (sk->sk_state == TCP_LISTEN) | |
391 | goto out; | |
392 | ||
93b36cf3 HFS |
393 | if (!ip6_sk_accept_pmtu(sk)) |
394 | goto out; | |
395 | ||
563d34d0 ED |
396 | tp->mtu_info = ntohl(info); |
397 | if (!sock_owned_by_user(sk)) | |
398 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
399 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
400 | &tp->tsq_flags)) | |
401 | sock_hold(sk); | |
1da177e4 LT |
402 | goto out; |
403 | } | |
404 | ||
1da177e4 | 405 | |
60236fdd | 406 | /* Might be for an request_sock */ |
1da177e4 | 407 | switch (sk->sk_state) { |
1da177e4 | 408 | case TCP_SYN_SENT: |
0a672f74 YC |
409 | case TCP_SYN_RECV: |
410 | /* Only in fast or simultaneous open. If a fast open socket is | |
411 | * is already accepted it is treated as a connected one below. | |
412 | */ | |
63159f29 | 413 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
414 | break; |
415 | ||
1da177e4 | 416 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
417 | sk->sk_err = err; |
418 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
419 | ||
420 | tcp_done(sk); | |
421 | } else | |
422 | sk->sk_err_soft = err; | |
423 | goto out; | |
424 | } | |
425 | ||
426 | if (!sock_owned_by_user(sk) && np->recverr) { | |
427 | sk->sk_err = err; | |
428 | sk->sk_error_report(sk); | |
429 | } else | |
430 | sk->sk_err_soft = err; | |
431 | ||
432 | out: | |
433 | bh_unlock_sock(sk); | |
434 | sock_put(sk); | |
435 | } | |
436 | ||
437 | ||
0f935dbe | 438 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 439 | struct flowi *fl, |
3840a06e | 440 | struct request_sock *req, |
ca6fb065 | 441 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 442 | enum tcp_synack_type synack_type) |
1da177e4 | 443 | { |
634fb979 | 444 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 445 | struct ipv6_pinfo *np = inet6_sk(sk); |
56ac42bc | 446 | struct ipv6_txoptions *opt; |
d6274bd8 | 447 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 448 | struct sk_buff *skb; |
9494218f | 449 | int err = -ENOMEM; |
1da177e4 | 450 | |
9f10d3f6 | 451 | /* First, grab a route. */ |
f76b33c3 ED |
452 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
453 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 454 | goto done; |
9494218f | 455 | |
b3d05147 | 456 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 457 | |
1da177e4 | 458 | if (skb) { |
634fb979 ED |
459 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
460 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 461 | |
634fb979 | 462 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 463 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
464 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
465 | ||
3e4006f0 | 466 | rcu_read_lock(); |
56ac42bc HD |
467 | opt = ireq->ipv6_opt; |
468 | if (!opt) | |
469 | opt = rcu_dereference(np->opt); | |
470 | err = ip6_xmit(sk, skb, fl6, opt, np->tclass); | |
3e4006f0 | 471 | rcu_read_unlock(); |
b9df3cb8 | 472 | err = net_xmit_eval(err); |
1da177e4 LT |
473 | } |
474 | ||
475 | done: | |
1da177e4 LT |
476 | return err; |
477 | } | |
478 | ||
72659ecc | 479 | |
60236fdd | 480 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 481 | { |
56ac42bc | 482 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 483 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
484 | } |
485 | ||
cfb6eeb4 | 486 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 487 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 488 | const struct in6_addr *addr) |
cfb6eeb4 | 489 | { |
a915da9b | 490 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
491 | } |
492 | ||
b83e3deb | 493 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 494 | const struct sock *addr_sk) |
cfb6eeb4 | 495 | { |
efe4208f | 496 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
497 | } |
498 | ||
4aa956d8 WY |
499 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
500 | int optlen) | |
cfb6eeb4 YH |
501 | { |
502 | struct tcp_md5sig cmd; | |
503 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
504 | |
505 | if (optlen < sizeof(cmd)) | |
506 | return -EINVAL; | |
507 | ||
508 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
509 | return -EFAULT; | |
510 | ||
511 | if (sin6->sin6_family != AF_INET6) | |
512 | return -EINVAL; | |
513 | ||
514 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 515 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
516 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
517 | AF_INET); | |
518 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
519 | AF_INET6); | |
cfb6eeb4 YH |
520 | } |
521 | ||
522 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
523 | return -EINVAL; | |
524 | ||
a915da9b ED |
525 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
526 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
527 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 528 | |
a915da9b ED |
529 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
530 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
531 | } |
532 | ||
19689e38 ED |
533 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
534 | const struct in6_addr *daddr, | |
535 | const struct in6_addr *saddr, | |
536 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 537 | { |
cfb6eeb4 | 538 | struct tcp6_pseudohdr *bp; |
49a72dfb | 539 | struct scatterlist sg; |
19689e38 | 540 | struct tcphdr *_th; |
8d26d76d | 541 | |
19689e38 | 542 | bp = hp->scratch; |
cfb6eeb4 | 543 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
544 | bp->saddr = *saddr; |
545 | bp->daddr = *daddr; | |
49a72dfb | 546 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 547 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 548 | |
19689e38 ED |
549 | _th = (struct tcphdr *)(bp + 1); |
550 | memcpy(_th, th, sizeof(*th)); | |
551 | _th->check = 0; | |
552 | ||
553 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
554 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
555 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 556 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 557 | } |
c7da57a1 | 558 | |
19689e38 | 559 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 560 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 561 | const struct tcphdr *th) |
49a72dfb AL |
562 | { |
563 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 564 | struct ahash_request *req; |
49a72dfb AL |
565 | |
566 | hp = tcp_get_md5sig_pool(); | |
567 | if (!hp) | |
568 | goto clear_hash_noput; | |
cf80e0e4 | 569 | req = hp->md5_req; |
49a72dfb | 570 | |
cf80e0e4 | 571 | if (crypto_ahash_init(req)) |
49a72dfb | 572 | goto clear_hash; |
19689e38 | 573 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
574 | goto clear_hash; |
575 | if (tcp_md5_hash_key(hp, key)) | |
576 | goto clear_hash; | |
cf80e0e4 HX |
577 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
578 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 579 | goto clear_hash; |
cfb6eeb4 | 580 | |
cfb6eeb4 | 581 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 582 | return 0; |
49a72dfb | 583 | |
cfb6eeb4 YH |
584 | clear_hash: |
585 | tcp_put_md5sig_pool(); | |
586 | clear_hash_noput: | |
587 | memset(md5_hash, 0, 16); | |
49a72dfb | 588 | return 1; |
cfb6eeb4 YH |
589 | } |
590 | ||
39f8e58e ED |
591 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
592 | const struct tcp_md5sig_key *key, | |
318cf7aa | 593 | const struct sock *sk, |
318cf7aa | 594 | const struct sk_buff *skb) |
cfb6eeb4 | 595 | { |
b71d1d42 | 596 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 597 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 598 | struct ahash_request *req; |
318cf7aa | 599 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 600 | |
39f8e58e ED |
601 | if (sk) { /* valid for establish/request sockets */ |
602 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 603 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 604 | } else { |
b71d1d42 | 605 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
606 | saddr = &ip6h->saddr; |
607 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 608 | } |
49a72dfb AL |
609 | |
610 | hp = tcp_get_md5sig_pool(); | |
611 | if (!hp) | |
612 | goto clear_hash_noput; | |
cf80e0e4 | 613 | req = hp->md5_req; |
49a72dfb | 614 | |
cf80e0e4 | 615 | if (crypto_ahash_init(req)) |
49a72dfb AL |
616 | goto clear_hash; |
617 | ||
19689e38 | 618 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
619 | goto clear_hash; |
620 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
621 | goto clear_hash; | |
622 | if (tcp_md5_hash_key(hp, key)) | |
623 | goto clear_hash; | |
cf80e0e4 HX |
624 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
625 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
626 | goto clear_hash; |
627 | ||
628 | tcp_put_md5sig_pool(); | |
629 | return 0; | |
630 | ||
631 | clear_hash: | |
632 | tcp_put_md5sig_pool(); | |
633 | clear_hash_noput: | |
634 | memset(md5_hash, 0, 16); | |
635 | return 1; | |
cfb6eeb4 YH |
636 | } |
637 | ||
ba8e275a ED |
638 | #endif |
639 | ||
640 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
641 | const struct sk_buff *skb) | |
cfb6eeb4 | 642 | { |
ba8e275a | 643 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 644 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 645 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 646 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 647 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 648 | int genhash; |
cfb6eeb4 YH |
649 | u8 newhash[16]; |
650 | ||
651 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 652 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 653 | |
785957d3 DM |
654 | /* We've parsed the options - do we have a hash? */ |
655 | if (!hash_expected && !hash_location) | |
ff74e23f | 656 | return false; |
785957d3 DM |
657 | |
658 | if (hash_expected && !hash_location) { | |
c10d9310 | 659 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 660 | return true; |
cfb6eeb4 YH |
661 | } |
662 | ||
785957d3 | 663 | if (!hash_expected && hash_location) { |
c10d9310 | 664 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 665 | return true; |
cfb6eeb4 YH |
666 | } |
667 | ||
668 | /* check the signature */ | |
49a72dfb AL |
669 | genhash = tcp_v6_md5_hash_skb(newhash, |
670 | hash_expected, | |
39f8e58e | 671 | NULL, skb); |
49a72dfb | 672 | |
cfb6eeb4 | 673 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
674 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
675 | genhash ? "failed" : "mismatch", | |
676 | &ip6h->saddr, ntohs(th->source), | |
677 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 678 | return true; |
cfb6eeb4 | 679 | } |
ba8e275a | 680 | #endif |
ff74e23f | 681 | return false; |
cfb6eeb4 | 682 | } |
cfb6eeb4 | 683 | |
b40cf18e ED |
684 | static void tcp_v6_init_req(struct request_sock *req, |
685 | const struct sock *sk_listener, | |
16bea70a OP |
686 | struct sk_buff *skb) |
687 | { | |
688 | struct inet_request_sock *ireq = inet_rsk(req); | |
b40cf18e | 689 | const struct ipv6_pinfo *np = inet6_sk(sk_listener); |
16bea70a OP |
690 | |
691 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
692 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
693 | ||
16bea70a | 694 | /* So that link locals have meaning */ |
b40cf18e | 695 | if (!sk_listener->sk_bound_dev_if && |
16bea70a | 696 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 697 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 698 | |
04317daf | 699 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 700 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 701 | np->rxopt.bits.rxinfo || |
16bea70a OP |
702 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
703 | np->rxopt.bits.rxohlim || np->repflow)) { | |
704 | atomic_inc(&skb->users); | |
705 | ireq->pktopts = skb; | |
706 | } | |
707 | } | |
708 | ||
f964629e ED |
709 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
710 | struct flowi *fl, | |
d94e0417 OP |
711 | const struct request_sock *req, |
712 | bool *strict) | |
713 | { | |
714 | if (strict) | |
715 | *strict = true; | |
f76b33c3 | 716 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
717 | } |
718 | ||
c6aefafb | 719 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 720 | .family = AF_INET6, |
2e6599cb | 721 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 722 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
723 | .send_ack = tcp_v6_reqsk_send_ack, |
724 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 725 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 726 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
727 | }; |
728 | ||
b2e4b3de | 729 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
730 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
731 | sizeof(struct ipv6hdr), | |
16bea70a | 732 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 733 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 734 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 735 | #endif |
16bea70a | 736 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
737 | #ifdef CONFIG_SYN_COOKIES |
738 | .cookie_init_seq = cookie_v6_init_sequence, | |
739 | #endif | |
d94e0417 | 740 | .route_req = tcp_v6_route_req, |
936b8bdb | 741 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 742 | .send_synack = tcp_v6_send_synack, |
16bea70a | 743 | }; |
cfb6eeb4 | 744 | |
a00e7444 | 745 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
746 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
747 | int oif, struct tcp_md5sig_key *key, int rst, | |
5119bd16 | 748 | u8 tclass, __be32 label) |
1da177e4 | 749 | { |
cf533ea5 ED |
750 | const struct tcphdr *th = tcp_hdr(skb); |
751 | struct tcphdr *t1; | |
1da177e4 | 752 | struct sk_buff *buff; |
4c9483b2 | 753 | struct flowi6 fl6; |
0f85feae | 754 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 755 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 756 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 757 | struct dst_entry *dst; |
81ada62d | 758 | __be32 *topt; |
1da177e4 | 759 | |
ee684b6f | 760 | if (tsecr) |
626e264d | 761 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 762 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
763 | if (key) |
764 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
765 | #endif | |
766 | ||
cfb6eeb4 | 767 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 768 | GFP_ATOMIC); |
63159f29 | 769 | if (!buff) |
1ab1457c | 770 | return; |
1da177e4 | 771 | |
cfb6eeb4 | 772 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 773 | |
cfb6eeb4 | 774 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 775 | skb_reset_transport_header(buff); |
1da177e4 LT |
776 | |
777 | /* Swap the send and the receive. */ | |
778 | memset(t1, 0, sizeof(*t1)); | |
779 | t1->dest = th->source; | |
780 | t1->source = th->dest; | |
cfb6eeb4 | 781 | t1->doff = tot_len / 4; |
626e264d IJ |
782 | t1->seq = htonl(seq); |
783 | t1->ack_seq = htonl(ack); | |
784 | t1->ack = !rst || !th->ack; | |
785 | t1->rst = rst; | |
786 | t1->window = htons(win); | |
1da177e4 | 787 | |
81ada62d IJ |
788 | topt = (__be32 *)(t1 + 1); |
789 | ||
ee684b6f | 790 | if (tsecr) { |
626e264d IJ |
791 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
792 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
793 | *topt++ = htonl(tsval); |
794 | *topt++ = htonl(tsecr); | |
626e264d IJ |
795 | } |
796 | ||
cfb6eeb4 YH |
797 | #ifdef CONFIG_TCP_MD5SIG |
798 | if (key) { | |
81ada62d IJ |
799 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
800 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
801 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
802 | &ipv6_hdr(skb)->saddr, |
803 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
804 | } |
805 | #endif | |
806 | ||
4c9483b2 | 807 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
808 | fl6.daddr = ipv6_hdr(skb)->saddr; |
809 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 810 | fl6.flowlabel = label; |
1da177e4 | 811 | |
e5700aff DM |
812 | buff->ip_summed = CHECKSUM_PARTIAL; |
813 | buff->csum = 0; | |
814 | ||
4c9483b2 | 815 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 816 | |
4c9483b2 | 817 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 818 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 819 | fl6.flowi6_oif = tcp_v6_iif(skb); |
1d2f7b2d DA |
820 | else { |
821 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
822 | oif = skb->skb_iif; | |
823 | ||
9c76a114 | 824 | fl6.flowi6_oif = oif; |
1d2f7b2d DA |
825 | } |
826 | ||
e110861f | 827 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
828 | fl6.fl6_dport = t1->dest; |
829 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 830 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 831 | |
c20121ae DL |
832 | /* Pass a socket to ip6_dst_lookup either it is for RST |
833 | * Underlying function will use this to retrieve the network | |
834 | * namespace | |
835 | */ | |
0e0d44ab | 836 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
837 | if (!IS_ERR(dst)) { |
838 | skb_dst_set(buff, dst); | |
b903d324 | 839 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
c10d9310 | 840 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 841 | if (rst) |
c10d9310 | 842 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 843 | return; |
1da177e4 LT |
844 | } |
845 | ||
846 | kfree_skb(buff); | |
847 | } | |
848 | ||
a00e7444 | 849 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 850 | { |
cf533ea5 | 851 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 852 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 853 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
854 | #ifdef CONFIG_TCP_MD5SIG |
855 | const __u8 *hash_location = NULL; | |
856 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
857 | unsigned char newhash[16]; | |
858 | int genhash; | |
859 | struct sock *sk1 = NULL; | |
860 | #endif | |
9c76a114 | 861 | int oif; |
1da177e4 | 862 | |
626e264d | 863 | if (th->rst) |
1da177e4 LT |
864 | return; |
865 | ||
c3658e8d ED |
866 | /* If sk not NULL, it means we did a successful lookup and incoming |
867 | * route had to be correct. prequeue might have dropped our dst. | |
868 | */ | |
869 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 870 | return; |
1da177e4 | 871 | |
cfb6eeb4 | 872 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 873 | rcu_read_lock(); |
658ddaaf | 874 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 875 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
876 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
877 | } else if (hash_location) { | |
658ddaaf SL |
878 | /* |
879 | * active side is lost. Try to find listening socket through | |
880 | * source port, and then find md5 key through listening socket. | |
881 | * we are not loose security here: | |
882 | * Incoming packet is checked with md5 hash with finding key, | |
883 | * no RST generated if md5 hash doesn't match. | |
884 | */ | |
885 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
a583636a CG |
886 | &tcp_hashinfo, NULL, 0, |
887 | &ipv6h->saddr, | |
5ba24953 | 888 | th->source, &ipv6h->daddr, |
870c3151 | 889 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf | 890 | if (!sk1) |
3b24d854 | 891 | goto out; |
658ddaaf | 892 | |
658ddaaf SL |
893 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
894 | if (!key) | |
3b24d854 | 895 | goto out; |
658ddaaf | 896 | |
39f8e58e | 897 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 898 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 899 | goto out; |
658ddaaf | 900 | } |
cfb6eeb4 YH |
901 | #endif |
902 | ||
626e264d IJ |
903 | if (th->ack) |
904 | seq = ntohl(th->ack_seq); | |
905 | else | |
906 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
907 | (th->doff << 2); | |
1da177e4 | 908 | |
9c76a114 | 909 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 910 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
911 | |
912 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
913 | out: |
914 | rcu_read_unlock(); | |
658ddaaf | 915 | #endif |
626e264d | 916 | } |
1da177e4 | 917 | |
a00e7444 | 918 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 919 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 920 | struct tcp_md5sig_key *key, u8 tclass, |
5119bd16 | 921 | __be32 label) |
626e264d | 922 | { |
0f85feae ED |
923 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
924 | tclass, label); | |
1da177e4 LT |
925 | } |
926 | ||
927 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
928 | { | |
8feaf0c0 | 929 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 930 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 931 | |
0f85feae | 932 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 933 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 934 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 935 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 936 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 937 | |
8feaf0c0 | 938 | inet_twsk_put(tw); |
1da177e4 LT |
939 | } |
940 | ||
a00e7444 | 941 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 942 | struct request_sock *req) |
1da177e4 | 943 | { |
3a19ce0e DL |
944 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
945 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
946 | */ | |
0f85feae | 947 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 948 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
ed53d0ab | 949 | tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd, |
0f85feae | 950 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
951 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
952 | 0, 0); | |
1da177e4 LT |
953 | } |
954 | ||
955 | ||
079096f1 | 956 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 957 | { |
079096f1 | 958 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 959 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 960 | |
af9b4738 | 961 | if (!th->syn) |
c6aefafb | 962 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
963 | #endif |
964 | return sk; | |
965 | } | |
966 | ||
1da177e4 LT |
967 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
968 | { | |
1da177e4 LT |
969 | if (skb->protocol == htons(ETH_P_IP)) |
970 | return tcp_v4_conn_request(sk, skb); | |
971 | ||
972 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 973 | goto drop; |
1da177e4 | 974 | |
1fb6f159 OP |
975 | return tcp_conn_request(&tcp6_request_sock_ops, |
976 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
977 | |
978 | drop: | |
9caad864 | 979 | tcp_listendrop(sk); |
1da177e4 LT |
980 | return 0; /* don't send reset */ |
981 | } | |
982 | ||
0c27171e | 983 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 984 | struct request_sock *req, |
5e0724d0 ED |
985 | struct dst_entry *dst, |
986 | struct request_sock *req_unhash, | |
987 | bool *own_req) | |
1da177e4 | 988 | { |
634fb979 | 989 | struct inet_request_sock *ireq; |
0c27171e ED |
990 | struct ipv6_pinfo *newnp; |
991 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 992 | struct ipv6_txoptions *opt; |
1da177e4 LT |
993 | struct tcp6_sock *newtcp6sk; |
994 | struct inet_sock *newinet; | |
995 | struct tcp_sock *newtp; | |
996 | struct sock *newsk; | |
cfb6eeb4 YH |
997 | #ifdef CONFIG_TCP_MD5SIG |
998 | struct tcp_md5sig_key *key; | |
999 | #endif | |
3840a06e | 1000 | struct flowi6 fl6; |
1da177e4 LT |
1001 | |
1002 | if (skb->protocol == htons(ETH_P_IP)) { | |
1003 | /* | |
1004 | * v6 mapped | |
1005 | */ | |
1006 | ||
5e0724d0 ED |
1007 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1008 | req_unhash, own_req); | |
1da177e4 | 1009 | |
63159f29 | 1010 | if (!newsk) |
1da177e4 LT |
1011 | return NULL; |
1012 | ||
1013 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1014 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1015 | ||
1016 | newinet = inet_sk(newsk); | |
1017 | newnp = inet6_sk(newsk); | |
1018 | newtp = tcp_sk(newsk); | |
1019 | ||
1020 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1021 | ||
d1e559d0 | 1022 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1023 | |
8292a17a | 1024 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1025 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1026 | #ifdef CONFIG_TCP_MD5SIG |
1027 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1028 | #endif | |
1029 | ||
676a1184 YZ |
1030 | newnp->ipv6_ac_list = NULL; |
1031 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1032 | newnp->pktoptions = NULL; |
1033 | newnp->opt = NULL; | |
870c3151 | 1034 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1035 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1036 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1037 | if (np->repflow) |
1038 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1039 | |
e6848976 ACM |
1040 | /* |
1041 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1042 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1043 | * that function for the gory details. -acme | |
1da177e4 | 1044 | */ |
1da177e4 LT |
1045 | |
1046 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1047 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1048 | Sync it now. |
1049 | */ | |
d83d8461 | 1050 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1051 | |
1052 | return newsk; | |
1053 | } | |
1054 | ||
634fb979 | 1055 | ireq = inet_rsk(req); |
1da177e4 LT |
1056 | |
1057 | if (sk_acceptq_is_full(sk)) | |
1058 | goto out_overflow; | |
1059 | ||
493f377d | 1060 | if (!dst) { |
f76b33c3 | 1061 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1062 | if (!dst) |
1da177e4 | 1063 | goto out; |
1ab1457c | 1064 | } |
1da177e4 LT |
1065 | |
1066 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1067 | if (!newsk) |
093d2823 | 1068 | goto out_nonewsk; |
1da177e4 | 1069 | |
e6848976 ACM |
1070 | /* |
1071 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1072 | * count here, tcp_create_openreq_child now does this for us, see the | |
1073 | * comment in that function for the gory details. -acme | |
1074 | */ | |
1da177e4 | 1075 | |
59eed279 | 1076 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1077 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1078 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1079 | |
1080 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1081 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1082 | ||
1083 | newtp = tcp_sk(newsk); | |
1084 | newinet = inet_sk(newsk); | |
1085 | newnp = inet6_sk(newsk); | |
1086 | ||
1087 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1088 | ||
634fb979 ED |
1089 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1090 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1091 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1092 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1093 | |
1ab1457c | 1094 | /* Now IPv6 options... |
1da177e4 LT |
1095 | |
1096 | First: no IPv4 options. | |
1097 | */ | |
f6d8bd05 | 1098 | newinet->inet_opt = NULL; |
676a1184 | 1099 | newnp->ipv6_ac_list = NULL; |
d35690be | 1100 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1101 | |
1102 | /* Clone RX bits */ | |
1103 | newnp->rxopt.all = np->rxopt.all; | |
1104 | ||
1da177e4 | 1105 | newnp->pktoptions = NULL; |
1da177e4 | 1106 | newnp->opt = NULL; |
870c3151 | 1107 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1108 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1109 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1110 | if (np->repflow) |
1111 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1112 | |
1113 | /* Clone native IPv6 options from listening socket (if any) | |
1114 | ||
1115 | Yes, keeping reference count would be much more clever, | |
1116 | but we make one more one thing there: reattach optmem | |
1117 | to newsk. | |
1118 | */ | |
56ac42bc HD |
1119 | opt = ireq->ipv6_opt; |
1120 | if (!opt) | |
1121 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1122 | if (opt) { |
1123 | opt = ipv6_dup_options(newsk, opt); | |
1124 | RCU_INIT_POINTER(newnp->opt, opt); | |
1125 | } | |
d83d8461 | 1126 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1127 | if (opt) |
1128 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1129 | opt->opt_flen; | |
1da177e4 | 1130 | |
81164413 DB |
1131 | tcp_ca_openreq_child(newsk, dst); |
1132 | ||
1da177e4 | 1133 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1134 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1135 | if (tcp_sk(sk)->rx_opt.user_mss && |
1136 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1137 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1138 | ||
1da177e4 LT |
1139 | tcp_initialize_rcv_mss(newsk); |
1140 | ||
c720c7e8 ED |
1141 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1142 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1143 | |
cfb6eeb4 YH |
1144 | #ifdef CONFIG_TCP_MD5SIG |
1145 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1146 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1147 | if (key) { |
cfb6eeb4 YH |
1148 | /* We're using one, so create a matching key |
1149 | * on the newsk structure. If we fail to get | |
1150 | * memory, then we end up not copying the key | |
1151 | * across. Shucks. | |
1152 | */ | |
efe4208f | 1153 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 | 1154 | AF_INET6, key->key, key->keylen, |
7450aaf6 | 1155 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1156 | } |
1157 | #endif | |
1158 | ||
093d2823 | 1159 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1160 | inet_csk_prepare_forced_close(newsk); |
1161 | tcp_done(newsk); | |
093d2823 BS |
1162 | goto out; |
1163 | } | |
5e0724d0 | 1164 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1165 | if (*own_req) { |
49a496c9 | 1166 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1167 | |
1168 | /* Clone pktoptions received with SYN, if we own the req */ | |
1169 | if (ireq->pktopts) { | |
1170 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1171 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1172 | consume_skb(ireq->pktopts); |
1173 | ireq->pktopts = NULL; | |
1174 | if (newnp->pktoptions) | |
1175 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1176 | } | |
ce105008 | 1177 | } |
1da177e4 LT |
1178 | |
1179 | return newsk; | |
1180 | ||
1181 | out_overflow: | |
02a1d6e7 | 1182 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1183 | out_nonewsk: |
1da177e4 | 1184 | dst_release(dst); |
093d2823 | 1185 | out: |
9caad864 | 1186 | tcp_listendrop(sk); |
1da177e4 LT |
1187 | return NULL; |
1188 | } | |
1189 | ||
1da177e4 | 1190 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1191 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1192 | * |
1193 | * We have a potential double-lock case here, so even when | |
1194 | * doing backlog processing we use the BH locking scheme. | |
1195 | * This is because we cannot sleep with the original spinlock | |
1196 | * held. | |
1197 | */ | |
1198 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1199 | { | |
1200 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1201 | struct tcp_sock *tp; | |
1202 | struct sk_buff *opt_skb = NULL; | |
1203 | ||
1204 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1205 | goes to IPv4 receive handler and backlogged. | |
1206 | From backlog it always goes here. Kerboom... | |
1207 | Fortunately, tcp_rcv_established and rcv_established | |
1208 | handle them correctly, but it is not case with | |
1209 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1210 | */ | |
1211 | ||
1212 | if (skb->protocol == htons(ETH_P_IP)) | |
1213 | return tcp_v4_do_rcv(sk, skb); | |
1214 | ||
fda9ef5d | 1215 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1216 | goto discard; |
1217 | ||
1218 | /* | |
1219 | * socket locking is here for SMP purposes as backlog rcv | |
1220 | * is currently called with bh processing disabled. | |
1221 | */ | |
1222 | ||
1223 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1224 | ||
1225 | Yes, guys, it is the only place in our code, where we | |
1226 | may make it not affecting IPv4. | |
1227 | The rest of code is protocol independent, | |
1228 | and I do not like idea to uglify IPv4. | |
1229 | ||
1230 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1231 | looks not very well thought. For now we latch | |
1232 | options, received in the last packet, enqueued | |
1233 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1234 | --ANK (980728) |
1da177e4 LT |
1235 | */ |
1236 | if (np->rxopt.all) | |
7450aaf6 | 1237 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1238 | |
1239 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1240 | struct dst_entry *dst = sk->sk_rx_dst; |
1241 | ||
bdeab991 | 1242 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1243 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1244 | if (dst) { |
1245 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1246 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1247 | dst_release(dst); | |
1248 | sk->sk_rx_dst = NULL; | |
1249 | } | |
1250 | } | |
1251 | ||
c995ae22 | 1252 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1253 | if (opt_skb) |
1254 | goto ipv6_pktoptions; | |
1255 | return 0; | |
1256 | } | |
1257 | ||
12e25e10 | 1258 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1259 | goto csum_err; |
1260 | ||
1ab1457c | 1261 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1262 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1263 | ||
1da177e4 LT |
1264 | if (!nsk) |
1265 | goto discard; | |
1266 | ||
4c99aa40 | 1267 | if (nsk != sk) { |
bdeab991 | 1268 | sock_rps_save_rxhash(nsk, skb); |
38cb5245 | 1269 | sk_mark_napi_id(nsk, skb); |
1da177e4 LT |
1270 | if (tcp_child_process(sk, nsk, skb)) |
1271 | goto reset; | |
1272 | if (opt_skb) | |
1273 | __kfree_skb(opt_skb); | |
1274 | return 0; | |
1275 | } | |
47482f13 | 1276 | } else |
bdeab991 | 1277 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1278 | |
72ab4a86 | 1279 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1280 | goto reset; |
1da177e4 LT |
1281 | if (opt_skb) |
1282 | goto ipv6_pktoptions; | |
1283 | return 0; | |
1284 | ||
1285 | reset: | |
cfb6eeb4 | 1286 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1287 | discard: |
1288 | if (opt_skb) | |
1289 | __kfree_skb(opt_skb); | |
1290 | kfree_skb(skb); | |
1291 | return 0; | |
1292 | csum_err: | |
c10d9310 ED |
1293 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1294 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1295 | goto discard; |
1296 | ||
1297 | ||
1298 | ipv6_pktoptions: | |
1299 | /* Do you ask, what is it? | |
1300 | ||
1301 | 1. skb was enqueued by tcp. | |
1302 | 2. skb is added to tail of read queue, rather than out of order. | |
1303 | 3. socket is not in passive state. | |
1304 | 4. Finally, it really contains options, which user wants to receive. | |
1305 | */ | |
1306 | tp = tcp_sk(sk); | |
1307 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1308 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1309 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1310 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1311 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1312 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1313 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1314 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1315 | if (np->repflow) |
1316 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1317 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1318 | skb_set_owner_r(opt_skb, sk); |
1319 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1320 | } else { | |
1321 | __kfree_skb(opt_skb); | |
1322 | opt_skb = xchg(&np->pktoptions, NULL); | |
1323 | } | |
1324 | } | |
1325 | ||
800d55f1 | 1326 | kfree_skb(opt_skb); |
1da177e4 LT |
1327 | return 0; |
1328 | } | |
1329 | ||
2dc49d16 ND |
1330 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1331 | const struct tcphdr *th) | |
1332 | { | |
1333 | /* This is tricky: we move IP6CB at its correct location into | |
1334 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1335 | * _decode_session6() uses IP6CB(). | |
1336 | * barrier() makes sure compiler won't play aliasing games. | |
1337 | */ | |
1338 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1339 | sizeof(struct inet6_skb_parm)); | |
1340 | barrier(); | |
1341 | ||
1342 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1343 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1344 | skb->len - th->doff*4); | |
1345 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1346 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1347 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1348 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1349 | TCP_SKB_CB(skb)->sacked = 0; | |
1350 | } | |
1351 | ||
4ad19de8 AK |
1352 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1353 | { | |
1354 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1355 | * and tcp_v6_fill_cb() are going to be called again. | |
1356 | */ | |
1357 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1358 | sizeof(struct inet6_skb_parm)); | |
1359 | } | |
1360 | ||
e5bbef20 | 1361 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1362 | { |
cf533ea5 | 1363 | const struct tcphdr *th; |
b71d1d42 | 1364 | const struct ipv6hdr *hdr; |
3b24d854 | 1365 | bool refcounted; |
1da177e4 LT |
1366 | struct sock *sk; |
1367 | int ret; | |
a86b1e30 | 1368 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1369 | |
1370 | if (skb->pkt_type != PACKET_HOST) | |
1371 | goto discard_it; | |
1372 | ||
1373 | /* | |
1374 | * Count it even if it's bad. | |
1375 | */ | |
90bbcc60 | 1376 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1377 | |
1378 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1379 | goto discard_it; | |
1380 | ||
ea1627c2 | 1381 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1382 | |
ea1627c2 | 1383 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1384 | goto bad_packet; |
1385 | if (!pskb_may_pull(skb, th->doff*4)) | |
1386 | goto discard_it; | |
1387 | ||
e4f45b7f | 1388 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1389 | goto csum_error; |
1da177e4 | 1390 | |
ea1627c2 | 1391 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1392 | hdr = ipv6_hdr(skb); |
1da177e4 | 1393 | |
4bdc3d66 | 1394 | lookup: |
a583636a | 1395 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
3b24d854 ED |
1396 | th->source, th->dest, inet6_iif(skb), |
1397 | &refcounted); | |
1da177e4 LT |
1398 | if (!sk) |
1399 | goto no_tcp_socket; | |
1400 | ||
1401 | process: | |
1402 | if (sk->sk_state == TCP_TIME_WAIT) | |
1403 | goto do_time_wait; | |
1404 | ||
079096f1 ED |
1405 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1406 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 1407 | struct sock *nsk; |
079096f1 ED |
1408 | |
1409 | sk = req->rsk_listener; | |
1410 | tcp_v6_fill_cb(skb, hdr, th); | |
1411 | if (tcp_v6_inbound_md5_hash(sk, skb)) { | |
1412 | reqsk_put(req); | |
1413 | goto discard_it; | |
1414 | } | |
7716682c | 1415 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1416 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1417 | goto lookup; |
1418 | } | |
7716682c | 1419 | sock_hold(sk); |
3b24d854 | 1420 | refcounted = true; |
7716682c | 1421 | nsk = tcp_check_req(sk, skb, req, false); |
079096f1 ED |
1422 | if (!nsk) { |
1423 | reqsk_put(req); | |
7716682c | 1424 | goto discard_and_relse; |
079096f1 ED |
1425 | } |
1426 | if (nsk == sk) { | |
079096f1 ED |
1427 | reqsk_put(req); |
1428 | tcp_v6_restore_cb(skb); | |
1429 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1430 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1431 | goto discard_and_relse; |
079096f1 | 1432 | } else { |
7716682c | 1433 | sock_put(sk); |
079096f1 ED |
1434 | return 0; |
1435 | } | |
1436 | } | |
e802af9c | 1437 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1438 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1439 | goto discard_and_relse; |
1440 | } | |
1441 | ||
1da177e4 LT |
1442 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1443 | goto discard_and_relse; | |
1444 | ||
2dc49d16 ND |
1445 | tcp_v6_fill_cb(skb, hdr, th); |
1446 | ||
9ea88a15 DP |
1447 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1448 | goto discard_and_relse; | |
9ea88a15 | 1449 | |
fda9ef5d | 1450 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1451 | goto discard_and_relse; |
1452 | ||
1453 | skb->dev = NULL; | |
1454 | ||
e994b2f0 ED |
1455 | if (sk->sk_state == TCP_LISTEN) { |
1456 | ret = tcp_v6_do_rcv(sk, skb); | |
1457 | goto put_and_return; | |
1458 | } | |
1459 | ||
1460 | sk_incoming_cpu_update(sk); | |
1461 | ||
293b9c42 | 1462 | bh_lock_sock_nested(sk); |
a44d6eac | 1463 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1464 | ret = 0; |
1465 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1466 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1467 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1468 | } else if (unlikely(sk_add_backlog(sk, skb, |
1469 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1470 | bh_unlock_sock(sk); |
02a1d6e7 | 1471 | __NET_INC_STATS(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1472 | goto discard_and_relse; |
1473 | } | |
1da177e4 LT |
1474 | bh_unlock_sock(sk); |
1475 | ||
e994b2f0 | 1476 | put_and_return: |
3b24d854 ED |
1477 | if (refcounted) |
1478 | sock_put(sk); | |
1da177e4 LT |
1479 | return ret ? -1 : 0; |
1480 | ||
1481 | no_tcp_socket: | |
1482 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1483 | goto discard_it; | |
1484 | ||
2dc49d16 ND |
1485 | tcp_v6_fill_cb(skb, hdr, th); |
1486 | ||
12e25e10 | 1487 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1488 | csum_error: |
90bbcc60 | 1489 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1490 | bad_packet: |
90bbcc60 | 1491 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1492 | } else { |
cfb6eeb4 | 1493 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1494 | } |
1495 | ||
1496 | discard_it: | |
1da177e4 LT |
1497 | kfree_skb(skb); |
1498 | return 0; | |
1499 | ||
1500 | discard_and_relse: | |
532182cd | 1501 | sk_drops_add(sk, skb); |
3b24d854 ED |
1502 | if (refcounted) |
1503 | sock_put(sk); | |
1da177e4 LT |
1504 | goto discard_it; |
1505 | ||
1506 | do_time_wait: | |
1507 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1508 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1509 | goto discard_it; |
1510 | } | |
1511 | ||
2dc49d16 ND |
1512 | tcp_v6_fill_cb(skb, hdr, th); |
1513 | ||
6a5dc9e5 ED |
1514 | if (tcp_checksum_complete(skb)) { |
1515 | inet_twsk_put(inet_twsk(sk)); | |
1516 | goto csum_error; | |
1da177e4 LT |
1517 | } |
1518 | ||
9469c7b4 | 1519 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1520 | case TCP_TW_SYN: |
1521 | { | |
1522 | struct sock *sk2; | |
1523 | ||
c346dca1 | 1524 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1525 | skb, __tcp_hdrlen(th), |
5ba24953 | 1526 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1527 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1528 | ntohs(th->dest), tcp_v6_iif(skb)); |
53b24b8f | 1529 | if (sk2) { |
295ff7ed | 1530 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1531 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1532 | sk = sk2; |
4ad19de8 | 1533 | tcp_v6_restore_cb(skb); |
3b24d854 | 1534 | refcounted = false; |
1da177e4 LT |
1535 | goto process; |
1536 | } | |
1537 | /* Fall through to ACK */ | |
1538 | } | |
1539 | case TCP_TW_ACK: | |
1540 | tcp_v6_timewait_ack(sk, skb); | |
1541 | break; | |
1542 | case TCP_TW_RST: | |
4ad19de8 | 1543 | tcp_v6_restore_cb(skb); |
271c3b9b FW |
1544 | tcp_v6_send_reset(sk, skb); |
1545 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1546 | goto discard_it; | |
4aa956d8 WY |
1547 | case TCP_TW_SUCCESS: |
1548 | ; | |
1da177e4 LT |
1549 | } |
1550 | goto discard_it; | |
1551 | } | |
1552 | ||
c7109986 ED |
1553 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1554 | { | |
1555 | const struct ipv6hdr *hdr; | |
1556 | const struct tcphdr *th; | |
1557 | struct sock *sk; | |
1558 | ||
1559 | if (skb->pkt_type != PACKET_HOST) | |
1560 | return; | |
1561 | ||
1562 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1563 | return; | |
1564 | ||
1565 | hdr = ipv6_hdr(skb); | |
1566 | th = tcp_hdr(skb); | |
1567 | ||
1568 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1569 | return; | |
1570 | ||
870c3151 | 1571 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1572 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1573 | &hdr->saddr, th->source, | |
1574 | &hdr->daddr, ntohs(th->dest), | |
1575 | inet6_iif(skb)); | |
1576 | if (sk) { | |
1577 | skb->sk = sk; | |
1578 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1579 | if (sk_fullsock(sk)) { |
d0c294c5 | 1580 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1581 | |
c7109986 | 1582 | if (dst) |
5d299f3d | 1583 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1584 | if (dst && |
f3f12135 | 1585 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1586 | skb_dst_set_noref(skb, dst); |
1587 | } | |
1588 | } | |
1589 | } | |
1590 | ||
ccb7c410 DM |
1591 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1592 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1593 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1594 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1595 | }; |
1596 | ||
3b401a81 | 1597 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1598 | .queue_xmit = inet6_csk_xmit, |
1599 | .send_check = tcp_v6_send_check, | |
1600 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1601 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1602 | .conn_request = tcp_v6_conn_request, |
1603 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1604 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1605 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1606 | .setsockopt = ipv6_setsockopt, |
1607 | .getsockopt = ipv6_getsockopt, | |
1608 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1609 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1610 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1611 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1612 | .compat_setsockopt = compat_ipv6_setsockopt, |
1613 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1614 | #endif |
4fab9071 | 1615 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1616 | }; |
1617 | ||
cfb6eeb4 | 1618 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1619 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1620 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1621 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1622 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1623 | }; |
a928630a | 1624 | #endif |
cfb6eeb4 | 1625 | |
1da177e4 LT |
1626 | /* |
1627 | * TCP over IPv4 via INET6 API | |
1628 | */ | |
3b401a81 | 1629 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1630 | .queue_xmit = ip_queue_xmit, |
1631 | .send_check = tcp_v4_send_check, | |
1632 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1633 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1634 | .conn_request = tcp_v6_conn_request, |
1635 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1636 | .net_header_len = sizeof(struct iphdr), |
1637 | .setsockopt = ipv6_setsockopt, | |
1638 | .getsockopt = ipv6_getsockopt, | |
1639 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1640 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1641 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1642 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1643 | .compat_setsockopt = compat_ipv6_setsockopt, |
1644 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1645 | #endif |
4fab9071 | 1646 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1647 | }; |
1648 | ||
cfb6eeb4 | 1649 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1650 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1651 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1652 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1653 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1654 | }; |
a928630a | 1655 | #endif |
cfb6eeb4 | 1656 | |
1da177e4 LT |
1657 | /* NOTE: A lot of things set to zero explicitly by call to |
1658 | * sk_alloc() so need not be done here. | |
1659 | */ | |
1660 | static int tcp_v6_init_sock(struct sock *sk) | |
1661 | { | |
6687e988 | 1662 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1663 | |
900f65d3 | 1664 | tcp_init_sock(sk); |
1da177e4 | 1665 | |
8292a17a | 1666 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1667 | |
cfb6eeb4 | 1668 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1669 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1670 | #endif |
1671 | ||
1da177e4 LT |
1672 | return 0; |
1673 | } | |
1674 | ||
7d06b2e0 | 1675 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1676 | { |
1da177e4 | 1677 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1678 | inet6_destroy_sock(sk); |
1da177e4 LT |
1679 | } |
1680 | ||
952a10be | 1681 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1682 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1683 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1684 | const struct request_sock *req, int i) |
1da177e4 | 1685 | { |
fa76ce73 | 1686 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1687 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1688 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1689 | |
1690 | if (ttd < 0) | |
1691 | ttd = 0; | |
1692 | ||
1da177e4 LT |
1693 | seq_printf(seq, |
1694 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1695 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1696 | i, |
1697 | src->s6_addr32[0], src->s6_addr32[1], | |
1698 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1699 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1700 | dest->s6_addr32[0], dest->s6_addr32[1], |
1701 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1702 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1703 | TCP_SYN_RECV, |
4c99aa40 | 1704 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1705 | 1, /* timers active (only the expire timer) */ |
1706 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1707 | req->num_timeout, |
aa3a0c8c ED |
1708 | from_kuid_munged(seq_user_ns(seq), |
1709 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1710 | 0, /* non standard timer */ |
1da177e4 LT |
1711 | 0, /* open_requests have no inode */ |
1712 | 0, req); | |
1713 | } | |
1714 | ||
1715 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1716 | { | |
b71d1d42 | 1717 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1718 | __u16 destp, srcp; |
1719 | int timer_active; | |
1720 | unsigned long timer_expires; | |
cf533ea5 ED |
1721 | const struct inet_sock *inet = inet_sk(sp); |
1722 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1723 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1724 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1725 | int rx_queue; |
1726 | int state; | |
1da177e4 | 1727 | |
efe4208f ED |
1728 | dest = &sp->sk_v6_daddr; |
1729 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1730 | destp = ntohs(inet->inet_dport); |
1731 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1732 | |
ce3cf4ec YC |
1733 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
1734 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || | |
1735 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { | |
1da177e4 | 1736 | timer_active = 1; |
463c84b9 ACM |
1737 | timer_expires = icsk->icsk_timeout; |
1738 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1739 | timer_active = 4; |
463c84b9 | 1740 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1741 | } else if (timer_pending(&sp->sk_timer)) { |
1742 | timer_active = 2; | |
1743 | timer_expires = sp->sk_timer.expires; | |
1744 | } else { | |
1745 | timer_active = 0; | |
1746 | timer_expires = jiffies; | |
1747 | } | |
1748 | ||
00fd38d9 ED |
1749 | state = sk_state_load(sp); |
1750 | if (state == TCP_LISTEN) | |
1751 | rx_queue = sp->sk_ack_backlog; | |
1752 | else | |
1753 | /* Because we don't lock the socket, | |
1754 | * we might find a transient negative value. | |
1755 | */ | |
1756 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1757 | ||
1da177e4 LT |
1758 | seq_printf(seq, |
1759 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1760 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1761 | i, |
1762 | src->s6_addr32[0], src->s6_addr32[1], | |
1763 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1764 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1765 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1766 | state, |
1767 | tp->write_seq - tp->snd_una, | |
1768 | rx_queue, | |
1da177e4 | 1769 | timer_active, |
a399a805 | 1770 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1771 | icsk->icsk_retransmits, |
a7cb5a49 | 1772 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1773 | icsk->icsk_probes_out, |
1da177e4 LT |
1774 | sock_i_ino(sp), |
1775 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1776 | jiffies_to_clock_t(icsk->icsk_rto), |
1777 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1778 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1779 | tp->snd_cwnd, |
00fd38d9 | 1780 | state == TCP_LISTEN ? |
0536fcc0 | 1781 | fastopenq->max_qlen : |
0a672f74 | 1782 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1783 | ); |
1784 | } | |
1785 | ||
1ab1457c | 1786 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1787 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1788 | { |
789f558c | 1789 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1790 | const struct in6_addr *dest, *src; |
1da177e4 | 1791 | __u16 destp, srcp; |
1da177e4 | 1792 | |
efe4208f ED |
1793 | dest = &tw->tw_v6_daddr; |
1794 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1795 | destp = ntohs(tw->tw_dport); |
1796 | srcp = ntohs(tw->tw_sport); | |
1797 | ||
1798 | seq_printf(seq, | |
1799 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1800 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1801 | i, |
1802 | src->s6_addr32[0], src->s6_addr32[1], | |
1803 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1804 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1805 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1806 | tw->tw_substate, 0, 0, | |
a399a805 | 1807 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1808 | atomic_read(&tw->tw_refcnt), tw); |
1809 | } | |
1810 | ||
1da177e4 LT |
1811 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1812 | { | |
1813 | struct tcp_iter_state *st; | |
05dbc7b5 | 1814 | struct sock *sk = v; |
1da177e4 LT |
1815 | |
1816 | if (v == SEQ_START_TOKEN) { | |
1817 | seq_puts(seq, | |
1818 | " sl " | |
1819 | "local_address " | |
1820 | "remote_address " | |
1821 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1822 | " uid timeout inode\n"); | |
1823 | goto out; | |
1824 | } | |
1825 | st = seq->private; | |
1826 | ||
079096f1 ED |
1827 | if (sk->sk_state == TCP_TIME_WAIT) |
1828 | get_timewait6_sock(seq, v, st->num); | |
1829 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1830 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1831 | else |
1832 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1833 | out: |
1834 | return 0; | |
1835 | } | |
1836 | ||
73cb88ec AV |
1837 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1838 | .owner = THIS_MODULE, | |
1839 | .open = tcp_seq_open, | |
1840 | .read = seq_read, | |
1841 | .llseek = seq_lseek, | |
1842 | .release = seq_release_net | |
1843 | }; | |
1844 | ||
1da177e4 | 1845 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1846 | .name = "tcp6", |
1847 | .family = AF_INET6, | |
73cb88ec | 1848 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1849 | .seq_ops = { |
1850 | .show = tcp6_seq_show, | |
1851 | }, | |
1da177e4 LT |
1852 | }; |
1853 | ||
2c8c1e72 | 1854 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1855 | { |
6f8b13bc | 1856 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1857 | } |
1858 | ||
6f8b13bc | 1859 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1860 | { |
6f8b13bc | 1861 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1862 | } |
1863 | #endif | |
1864 | ||
f77d6021 ED |
1865 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1866 | { | |
1867 | struct inet_sock *inet = inet_sk(sk); | |
1868 | ||
1869 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1870 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1871 | ||
1872 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1873 | memset(&inet->pinet6 + 1, 0, size); | |
1874 | } | |
1875 | ||
1da177e4 LT |
1876 | struct proto tcpv6_prot = { |
1877 | .name = "TCPv6", | |
1878 | .owner = THIS_MODULE, | |
1879 | .close = tcp_close, | |
1880 | .connect = tcp_v6_connect, | |
1881 | .disconnect = tcp_disconnect, | |
463c84b9 | 1882 | .accept = inet_csk_accept, |
1da177e4 LT |
1883 | .ioctl = tcp_ioctl, |
1884 | .init = tcp_v6_init_sock, | |
1885 | .destroy = tcp_v6_destroy_sock, | |
1886 | .shutdown = tcp_shutdown, | |
1887 | .setsockopt = tcp_setsockopt, | |
1888 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1889 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1890 | .sendmsg = tcp_sendmsg, |
1891 | .sendpage = tcp_sendpage, | |
1da177e4 | 1892 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1893 | .release_cb = tcp_release_cb, |
496611d7 | 1894 | .hash = inet6_hash, |
ab1e0a13 ACM |
1895 | .unhash = inet_unhash, |
1896 | .get_port = inet_csk_get_port, | |
1da177e4 | 1897 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1898 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1899 | .sockets_allocated = &tcp_sockets_allocated, |
1900 | .memory_allocated = &tcp_memory_allocated, | |
1901 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1902 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1903 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1904 | .sysctl_wmem = sysctl_tcp_wmem, |
1905 | .sysctl_rmem = sysctl_tcp_rmem, | |
1906 | .max_header = MAX_TCP_HEADER, | |
1907 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1908 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1909 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1910 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1911 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1912 | .no_autobind = true, |
543d9cfe ACM |
1913 | #ifdef CONFIG_COMPAT |
1914 | .compat_setsockopt = compat_tcp_setsockopt, | |
1915 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 1916 | #endif |
f77d6021 | 1917 | .clear_sk = tcp_v6_clear_sk, |
c1e64e29 | 1918 | .diag_destroy = tcp_abort, |
1da177e4 LT |
1919 | }; |
1920 | ||
41135cc8 | 1921 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1922 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1923 | .handler = tcp_v6_rcv, |
1924 | .err_handler = tcp_v6_err, | |
1925 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1926 | }; | |
1927 | ||
1da177e4 LT |
1928 | static struct inet_protosw tcpv6_protosw = { |
1929 | .type = SOCK_STREAM, | |
1930 | .protocol = IPPROTO_TCP, | |
1931 | .prot = &tcpv6_prot, | |
1932 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1933 | .flags = INET_PROTOSW_PERMANENT | |
1934 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1935 | }; |
1936 | ||
2c8c1e72 | 1937 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1938 | { |
5677242f DL |
1939 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1940 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1941 | } |
1942 | ||
2c8c1e72 | 1943 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1944 | { |
5677242f | 1945 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1946 | } |
1947 | ||
2c8c1e72 | 1948 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1949 | { |
1950 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1951 | } |
1952 | ||
1953 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1954 | .init = tcpv6_net_init, |
1955 | .exit = tcpv6_net_exit, | |
1956 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1957 | }; |
1958 | ||
7f4e4868 | 1959 | int __init tcpv6_init(void) |
1da177e4 | 1960 | { |
7f4e4868 DL |
1961 | int ret; |
1962 | ||
3336288a VY |
1963 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1964 | if (ret) | |
c6b641a4 | 1965 | goto out; |
3336288a | 1966 | |
1da177e4 | 1967 | /* register inet6 protocol */ |
7f4e4868 DL |
1968 | ret = inet6_register_protosw(&tcpv6_protosw); |
1969 | if (ret) | |
1970 | goto out_tcpv6_protocol; | |
1971 | ||
93ec926b | 1972 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1973 | if (ret) |
1974 | goto out_tcpv6_protosw; | |
1975 | out: | |
1976 | return ret; | |
ae0f7d5f | 1977 | |
7f4e4868 DL |
1978 | out_tcpv6_protosw: |
1979 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1980 | out_tcpv6_protocol: |
1981 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1982 | goto out; |
1983 | } | |
1984 | ||
09f7709f | 1985 | void tcpv6_exit(void) |
7f4e4868 | 1986 | { |
93ec926b | 1987 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1988 | inet6_unregister_protosw(&tcpv6_protosw); |
1989 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1990 | } |