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Commit | Line | Data |
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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 | ||
cfb6eeb4 YH |
69 | #include <linux/crypto.h> |
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 | |
45f6fad8 ED |
237 | opt = rcu_dereference_protected(np->opt, sock_owned_by_user(sk)); |
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 ED |
329 | struct sock *sk; |
330 | int err; | |
1da177e4 | 331 | |
2215089b ED |
332 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
333 | &hdr->daddr, th->dest, | |
334 | &hdr->saddr, ntohs(th->source), | |
335 | skb->dev->ifindex); | |
1da177e4 | 336 | |
2215089b | 337 | if (!sk) { |
e41b5368 DL |
338 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
339 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
340 | return; |
341 | } | |
342 | ||
343 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 344 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
345 | return; |
346 | } | |
2215089b ED |
347 | seq = ntohl(th->seq); |
348 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
349 | return tcp_req_err(sk, seq); | |
1da177e4 LT |
350 | |
351 | bh_lock_sock(sk); | |
563d34d0 | 352 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 353 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
354 | |
355 | if (sk->sk_state == TCP_CLOSE) | |
356 | goto out; | |
357 | ||
e802af9c SH |
358 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
359 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
360 | goto out; | |
361 | } | |
362 | ||
1da177e4 | 363 | tp = tcp_sk(sk); |
0a672f74 YC |
364 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
365 | fastopen = tp->fastopen_rsk; | |
366 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 367 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 368 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 369 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
370 | goto out; |
371 | } | |
372 | ||
373 | np = inet6_sk(sk); | |
374 | ||
ec18d9a2 DM |
375 | if (type == NDISC_REDIRECT) { |
376 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
377 | ||
1ed5c48f | 378 | if (dst) |
6700c270 | 379 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 380 | goto out; |
ec18d9a2 DM |
381 | } |
382 | ||
1da177e4 | 383 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
384 | /* We are not interested in TCP_LISTEN and open_requests |
385 | * (SYN-ACKs send out by Linux are always <576bytes so | |
386 | * they should go through unfragmented). | |
387 | */ | |
388 | if (sk->sk_state == TCP_LISTEN) | |
389 | goto out; | |
390 | ||
93b36cf3 HFS |
391 | if (!ip6_sk_accept_pmtu(sk)) |
392 | goto out; | |
393 | ||
563d34d0 ED |
394 | tp->mtu_info = ntohl(info); |
395 | if (!sock_owned_by_user(sk)) | |
396 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
397 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
398 | &tp->tsq_flags)) | |
399 | sock_hold(sk); | |
1da177e4 LT |
400 | goto out; |
401 | } | |
402 | ||
403 | icmpv6_err_convert(type, code, &err); | |
404 | ||
60236fdd | 405 | /* Might be for an request_sock */ |
1da177e4 | 406 | switch (sk->sk_state) { |
1da177e4 | 407 | case TCP_SYN_SENT: |
0a672f74 YC |
408 | case TCP_SYN_RECV: |
409 | /* Only in fast or simultaneous open. If a fast open socket is | |
410 | * is already accepted it is treated as a connected one below. | |
411 | */ | |
63159f29 | 412 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
413 | break; |
414 | ||
1da177e4 | 415 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
416 | sk->sk_err = err; |
417 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
418 | ||
419 | tcp_done(sk); | |
420 | } else | |
421 | sk->sk_err_soft = err; | |
422 | goto out; | |
423 | } | |
424 | ||
425 | if (!sock_owned_by_user(sk) && np->recverr) { | |
426 | sk->sk_err = err; | |
427 | sk->sk_error_report(sk); | |
428 | } else | |
429 | sk->sk_err_soft = err; | |
430 | ||
431 | out: | |
432 | bh_unlock_sock(sk); | |
433 | sock_put(sk); | |
434 | } | |
435 | ||
436 | ||
0f935dbe | 437 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 438 | struct flowi *fl, |
3840a06e | 439 | struct request_sock *req, |
ca6fb065 ED |
440 | struct tcp_fastopen_cookie *foc, |
441 | bool attach_req) | |
1da177e4 | 442 | { |
634fb979 | 443 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 444 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 445 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 446 | struct sk_buff *skb; |
9494218f | 447 | int err = -ENOMEM; |
1da177e4 | 448 | |
9f10d3f6 | 449 | /* First, grab a route. */ |
f76b33c3 ED |
450 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
451 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 452 | goto done; |
9494218f | 453 | |
ca6fb065 | 454 | skb = tcp_make_synack(sk, dst, req, foc, attach_req); |
9494218f | 455 | |
1da177e4 | 456 | if (skb) { |
634fb979 ED |
457 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
458 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 459 | |
634fb979 | 460 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 461 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
462 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
463 | ||
3e4006f0 | 464 | rcu_read_lock(); |
45f6fad8 ED |
465 | err = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt), |
466 | np->tclass); | |
3e4006f0 | 467 | rcu_read_unlock(); |
b9df3cb8 | 468 | err = net_xmit_eval(err); |
1da177e4 LT |
469 | } |
470 | ||
471 | done: | |
1da177e4 LT |
472 | return err; |
473 | } | |
474 | ||
72659ecc | 475 | |
60236fdd | 476 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 477 | { |
634fb979 | 478 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
479 | } |
480 | ||
cfb6eeb4 | 481 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 482 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 483 | const struct in6_addr *addr) |
cfb6eeb4 | 484 | { |
a915da9b | 485 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
486 | } |
487 | ||
b83e3deb | 488 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 489 | const struct sock *addr_sk) |
cfb6eeb4 | 490 | { |
efe4208f | 491 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
492 | } |
493 | ||
4aa956d8 WY |
494 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
495 | int optlen) | |
cfb6eeb4 YH |
496 | { |
497 | struct tcp_md5sig cmd; | |
498 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
499 | |
500 | if (optlen < sizeof(cmd)) | |
501 | return -EINVAL; | |
502 | ||
503 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
504 | return -EFAULT; | |
505 | ||
506 | if (sin6->sin6_family != AF_INET6) | |
507 | return -EINVAL; | |
508 | ||
509 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 510 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
511 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
512 | AF_INET); | |
513 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
514 | AF_INET6); | |
cfb6eeb4 YH |
515 | } |
516 | ||
517 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
518 | return -EINVAL; | |
519 | ||
a915da9b ED |
520 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
521 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
522 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 523 | |
a915da9b ED |
524 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
525 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
526 | } |
527 | ||
49a72dfb | 528 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
529 | const struct in6_addr *daddr, |
530 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 531 | { |
cfb6eeb4 | 532 | struct tcp6_pseudohdr *bp; |
49a72dfb | 533 | struct scatterlist sg; |
8d26d76d | 534 | |
cfb6eeb4 | 535 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 536 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
537 | bp->saddr = *saddr; |
538 | bp->daddr = *daddr; | |
49a72dfb | 539 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 540 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 541 | |
49a72dfb AL |
542 | sg_init_one(&sg, bp, sizeof(*bp)); |
543 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
544 | } | |
c7da57a1 | 545 | |
49a72dfb | 546 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 547 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 548 | const struct tcphdr *th) |
49a72dfb AL |
549 | { |
550 | struct tcp_md5sig_pool *hp; | |
551 | struct hash_desc *desc; | |
552 | ||
553 | hp = tcp_get_md5sig_pool(); | |
554 | if (!hp) | |
555 | goto clear_hash_noput; | |
556 | desc = &hp->md5_desc; | |
557 | ||
558 | if (crypto_hash_init(desc)) | |
559 | goto clear_hash; | |
560 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
561 | goto clear_hash; | |
562 | if (tcp_md5_hash_header(hp, th)) | |
563 | goto clear_hash; | |
564 | if (tcp_md5_hash_key(hp, key)) | |
565 | goto clear_hash; | |
566 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 567 | goto clear_hash; |
cfb6eeb4 | 568 | |
cfb6eeb4 | 569 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 570 | return 0; |
49a72dfb | 571 | |
cfb6eeb4 YH |
572 | clear_hash: |
573 | tcp_put_md5sig_pool(); | |
574 | clear_hash_noput: | |
575 | memset(md5_hash, 0, 16); | |
49a72dfb | 576 | return 1; |
cfb6eeb4 YH |
577 | } |
578 | ||
39f8e58e ED |
579 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
580 | const struct tcp_md5sig_key *key, | |
318cf7aa | 581 | const struct sock *sk, |
318cf7aa | 582 | const struct sk_buff *skb) |
cfb6eeb4 | 583 | { |
b71d1d42 | 584 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
585 | struct tcp_md5sig_pool *hp; |
586 | struct hash_desc *desc; | |
318cf7aa | 587 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 588 | |
39f8e58e ED |
589 | if (sk) { /* valid for establish/request sockets */ |
590 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 591 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 592 | } else { |
b71d1d42 | 593 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
594 | saddr = &ip6h->saddr; |
595 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 596 | } |
49a72dfb AL |
597 | |
598 | hp = tcp_get_md5sig_pool(); | |
599 | if (!hp) | |
600 | goto clear_hash_noput; | |
601 | desc = &hp->md5_desc; | |
602 | ||
603 | if (crypto_hash_init(desc)) | |
604 | goto clear_hash; | |
605 | ||
606 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
607 | goto clear_hash; | |
608 | if (tcp_md5_hash_header(hp, th)) | |
609 | goto clear_hash; | |
610 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
611 | goto clear_hash; | |
612 | if (tcp_md5_hash_key(hp, key)) | |
613 | goto clear_hash; | |
614 | if (crypto_hash_final(desc, md5_hash)) | |
615 | goto clear_hash; | |
616 | ||
617 | tcp_put_md5sig_pool(); | |
618 | return 0; | |
619 | ||
620 | clear_hash: | |
621 | tcp_put_md5sig_pool(); | |
622 | clear_hash_noput: | |
623 | memset(md5_hash, 0, 16); | |
624 | return 1; | |
cfb6eeb4 YH |
625 | } |
626 | ||
ba8e275a ED |
627 | #endif |
628 | ||
629 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
630 | const struct sk_buff *skb) | |
cfb6eeb4 | 631 | { |
ba8e275a | 632 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 633 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 634 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 635 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 636 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 637 | int genhash; |
cfb6eeb4 YH |
638 | u8 newhash[16]; |
639 | ||
640 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 641 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 642 | |
785957d3 DM |
643 | /* We've parsed the options - do we have a hash? */ |
644 | if (!hash_expected && !hash_location) | |
ff74e23f | 645 | return false; |
785957d3 DM |
646 | |
647 | if (hash_expected && !hash_location) { | |
648 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
ff74e23f | 649 | return true; |
cfb6eeb4 YH |
650 | } |
651 | ||
785957d3 DM |
652 | if (!hash_expected && hash_location) { |
653 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
ff74e23f | 654 | return true; |
cfb6eeb4 YH |
655 | } |
656 | ||
657 | /* check the signature */ | |
49a72dfb AL |
658 | genhash = tcp_v6_md5_hash_skb(newhash, |
659 | hash_expected, | |
39f8e58e | 660 | NULL, skb); |
49a72dfb | 661 | |
cfb6eeb4 | 662 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
663 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
664 | genhash ? "failed" : "mismatch", | |
665 | &ip6h->saddr, ntohs(th->source), | |
666 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 667 | return true; |
cfb6eeb4 | 668 | } |
ba8e275a | 669 | #endif |
ff74e23f | 670 | return false; |
cfb6eeb4 | 671 | } |
cfb6eeb4 | 672 | |
b40cf18e ED |
673 | static void tcp_v6_init_req(struct request_sock *req, |
674 | const struct sock *sk_listener, | |
16bea70a OP |
675 | struct sk_buff *skb) |
676 | { | |
677 | struct inet_request_sock *ireq = inet_rsk(req); | |
b40cf18e | 678 | const struct ipv6_pinfo *np = inet6_sk(sk_listener); |
16bea70a OP |
679 | |
680 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
681 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
682 | ||
16bea70a | 683 | /* So that link locals have meaning */ |
b40cf18e | 684 | if (!sk_listener->sk_bound_dev_if && |
16bea70a | 685 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 686 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 687 | |
04317daf | 688 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 689 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 690 | np->rxopt.bits.rxinfo || |
16bea70a OP |
691 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
692 | np->rxopt.bits.rxohlim || np->repflow)) { | |
693 | atomic_inc(&skb->users); | |
694 | ireq->pktopts = skb; | |
695 | } | |
696 | } | |
697 | ||
f964629e ED |
698 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
699 | struct flowi *fl, | |
d94e0417 OP |
700 | const struct request_sock *req, |
701 | bool *strict) | |
702 | { | |
703 | if (strict) | |
704 | *strict = true; | |
f76b33c3 | 705 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
706 | } |
707 | ||
c6aefafb | 708 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 709 | .family = AF_INET6, |
2e6599cb | 710 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 711 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
712 | .send_ack = tcp_v6_reqsk_send_ack, |
713 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 714 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 715 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
716 | }; |
717 | ||
b2e4b3de | 718 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
719 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
720 | sizeof(struct ipv6hdr), | |
16bea70a | 721 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 722 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 723 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 724 | #endif |
16bea70a | 725 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
726 | #ifdef CONFIG_SYN_COOKIES |
727 | .cookie_init_seq = cookie_v6_init_sequence, | |
728 | #endif | |
d94e0417 | 729 | .route_req = tcp_v6_route_req, |
936b8bdb | 730 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 731 | .send_synack = tcp_v6_send_synack, |
16bea70a | 732 | }; |
cfb6eeb4 | 733 | |
a00e7444 | 734 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
735 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
736 | int oif, struct tcp_md5sig_key *key, int rst, | |
737 | u8 tclass, u32 label) | |
1da177e4 | 738 | { |
cf533ea5 ED |
739 | const struct tcphdr *th = tcp_hdr(skb); |
740 | struct tcphdr *t1; | |
1da177e4 | 741 | struct sk_buff *buff; |
4c9483b2 | 742 | struct flowi6 fl6; |
0f85feae | 743 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 744 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 745 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 746 | struct dst_entry *dst; |
81ada62d | 747 | __be32 *topt; |
1da177e4 | 748 | |
ee684b6f | 749 | if (tsecr) |
626e264d | 750 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 751 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
752 | if (key) |
753 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
754 | #endif | |
755 | ||
cfb6eeb4 | 756 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 757 | GFP_ATOMIC); |
63159f29 | 758 | if (!buff) |
1ab1457c | 759 | return; |
1da177e4 | 760 | |
cfb6eeb4 | 761 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 762 | |
cfb6eeb4 | 763 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 764 | skb_reset_transport_header(buff); |
1da177e4 LT |
765 | |
766 | /* Swap the send and the receive. */ | |
767 | memset(t1, 0, sizeof(*t1)); | |
768 | t1->dest = th->source; | |
769 | t1->source = th->dest; | |
cfb6eeb4 | 770 | t1->doff = tot_len / 4; |
626e264d IJ |
771 | t1->seq = htonl(seq); |
772 | t1->ack_seq = htonl(ack); | |
773 | t1->ack = !rst || !th->ack; | |
774 | t1->rst = rst; | |
775 | t1->window = htons(win); | |
1da177e4 | 776 | |
81ada62d IJ |
777 | topt = (__be32 *)(t1 + 1); |
778 | ||
ee684b6f | 779 | if (tsecr) { |
626e264d IJ |
780 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
781 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
782 | *topt++ = htonl(tsval); |
783 | *topt++ = htonl(tsecr); | |
626e264d IJ |
784 | } |
785 | ||
cfb6eeb4 YH |
786 | #ifdef CONFIG_TCP_MD5SIG |
787 | if (key) { | |
81ada62d IJ |
788 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
789 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
790 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
791 | &ipv6_hdr(skb)->saddr, |
792 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
793 | } |
794 | #endif | |
795 | ||
4c9483b2 | 796 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
797 | fl6.daddr = ipv6_hdr(skb)->saddr; |
798 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 799 | fl6.flowlabel = label; |
1da177e4 | 800 | |
e5700aff DM |
801 | buff->ip_summed = CHECKSUM_PARTIAL; |
802 | buff->csum = 0; | |
803 | ||
4c9483b2 | 804 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 805 | |
4c9483b2 | 806 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 807 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 808 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
809 | else |
810 | fl6.flowi6_oif = oif; | |
e110861f | 811 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
812 | fl6.fl6_dport = t1->dest; |
813 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 814 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 815 | |
c20121ae DL |
816 | /* Pass a socket to ip6_dst_lookup either it is for RST |
817 | * Underlying function will use this to retrieve the network | |
818 | * namespace | |
819 | */ | |
0e0d44ab | 820 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
821 | if (!IS_ERR(dst)) { |
822 | skb_dst_set(buff, dst); | |
b903d324 | 823 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
824 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
825 | if (rst) | |
826 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
827 | return; | |
1da177e4 LT |
828 | } |
829 | ||
830 | kfree_skb(buff); | |
831 | } | |
832 | ||
a00e7444 | 833 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 834 | { |
cf533ea5 | 835 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 836 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 837 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
838 | #ifdef CONFIG_TCP_MD5SIG |
839 | const __u8 *hash_location = NULL; | |
840 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
841 | unsigned char newhash[16]; | |
842 | int genhash; | |
843 | struct sock *sk1 = NULL; | |
844 | #endif | |
9c76a114 | 845 | int oif; |
1da177e4 | 846 | |
626e264d | 847 | if (th->rst) |
1da177e4 LT |
848 | return; |
849 | ||
c3658e8d ED |
850 | /* If sk not NULL, it means we did a successful lookup and incoming |
851 | * route had to be correct. prequeue might have dropped our dst. | |
852 | */ | |
853 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 854 | return; |
1da177e4 | 855 | |
cfb6eeb4 | 856 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf | 857 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 858 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
859 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
860 | } else if (hash_location) { | |
658ddaaf SL |
861 | /* |
862 | * active side is lost. Try to find listening socket through | |
863 | * source port, and then find md5 key through listening socket. | |
864 | * we are not loose security here: | |
865 | * Incoming packet is checked with md5 hash with finding key, | |
866 | * no RST generated if md5 hash doesn't match. | |
867 | */ | |
868 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
869 | &tcp_hashinfo, &ipv6h->saddr, |
870 | th->source, &ipv6h->daddr, | |
870c3151 | 871 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf SL |
872 | if (!sk1) |
873 | return; | |
874 | ||
875 | rcu_read_lock(); | |
876 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
877 | if (!key) | |
878 | goto release_sk1; | |
879 | ||
39f8e58e | 880 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf SL |
881 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
882 | goto release_sk1; | |
658ddaaf | 883 | } |
cfb6eeb4 YH |
884 | #endif |
885 | ||
626e264d IJ |
886 | if (th->ack) |
887 | seq = ntohl(th->ack_seq); | |
888 | else | |
889 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
890 | (th->doff << 2); | |
1da177e4 | 891 | |
9c76a114 | 892 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 893 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
894 | |
895 | #ifdef CONFIG_TCP_MD5SIG | |
896 | release_sk1: | |
897 | if (sk1) { | |
898 | rcu_read_unlock(); | |
899 | sock_put(sk1); | |
900 | } | |
901 | #endif | |
626e264d | 902 | } |
1da177e4 | 903 | |
a00e7444 | 904 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 905 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
906 | struct tcp_md5sig_key *key, u8 tclass, |
907 | u32 label) | |
626e264d | 908 | { |
0f85feae ED |
909 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
910 | tclass, label); | |
1da177e4 LT |
911 | } |
912 | ||
913 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
914 | { | |
8feaf0c0 | 915 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 916 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 917 | |
0f85feae | 918 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 919 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 920 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 921 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 922 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 923 | |
8feaf0c0 | 924 | inet_twsk_put(tw); |
1da177e4 LT |
925 | } |
926 | ||
a00e7444 | 927 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 928 | struct request_sock *req) |
1da177e4 | 929 | { |
3a19ce0e DL |
930 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
931 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
932 | */ | |
0f85feae | 933 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 934 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
ed53d0ab | 935 | tcp_rsk(req)->rcv_nxt, req->rsk_rcv_wnd, |
0f85feae | 936 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
937 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
938 | 0, 0); | |
1da177e4 LT |
939 | } |
940 | ||
941 | ||
079096f1 | 942 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 943 | { |
079096f1 | 944 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 945 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 946 | |
af9b4738 | 947 | if (!th->syn) |
c6aefafb | 948 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
949 | #endif |
950 | return sk; | |
951 | } | |
952 | ||
1da177e4 LT |
953 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
954 | { | |
1da177e4 LT |
955 | if (skb->protocol == htons(ETH_P_IP)) |
956 | return tcp_v4_conn_request(sk, skb); | |
957 | ||
958 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 959 | goto drop; |
1da177e4 | 960 | |
1fb6f159 OP |
961 | return tcp_conn_request(&tcp6_request_sock_ops, |
962 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
963 | |
964 | drop: | |
5f1e942c | 965 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
966 | return 0; /* don't send reset */ |
967 | } | |
968 | ||
0c27171e | 969 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 970 | struct request_sock *req, |
5e0724d0 ED |
971 | struct dst_entry *dst, |
972 | struct request_sock *req_unhash, | |
973 | bool *own_req) | |
1da177e4 | 974 | { |
634fb979 | 975 | struct inet_request_sock *ireq; |
0c27171e ED |
976 | struct ipv6_pinfo *newnp; |
977 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 978 | struct ipv6_txoptions *opt; |
1da177e4 LT |
979 | struct tcp6_sock *newtcp6sk; |
980 | struct inet_sock *newinet; | |
981 | struct tcp_sock *newtp; | |
982 | struct sock *newsk; | |
cfb6eeb4 YH |
983 | #ifdef CONFIG_TCP_MD5SIG |
984 | struct tcp_md5sig_key *key; | |
985 | #endif | |
3840a06e | 986 | struct flowi6 fl6; |
1da177e4 LT |
987 | |
988 | if (skb->protocol == htons(ETH_P_IP)) { | |
989 | /* | |
990 | * v6 mapped | |
991 | */ | |
992 | ||
5e0724d0 ED |
993 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
994 | req_unhash, own_req); | |
1da177e4 | 995 | |
63159f29 | 996 | if (!newsk) |
1da177e4 LT |
997 | return NULL; |
998 | ||
999 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1000 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1001 | ||
1002 | newinet = inet_sk(newsk); | |
1003 | newnp = inet6_sk(newsk); | |
1004 | newtp = tcp_sk(newsk); | |
1005 | ||
1006 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1007 | ||
d1e559d0 | 1008 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1009 | |
8292a17a | 1010 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1011 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1012 | #ifdef CONFIG_TCP_MD5SIG |
1013 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1014 | #endif | |
1015 | ||
676a1184 YZ |
1016 | newnp->ipv6_ac_list = NULL; |
1017 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1018 | newnp->pktoptions = NULL; |
1019 | newnp->opt = NULL; | |
870c3151 | 1020 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1021 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1022 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1023 | if (np->repflow) |
1024 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1025 | |
e6848976 ACM |
1026 | /* |
1027 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1028 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1029 | * that function for the gory details. -acme | |
1da177e4 | 1030 | */ |
1da177e4 LT |
1031 | |
1032 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1033 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1034 | Sync it now. |
1035 | */ | |
d83d8461 | 1036 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1037 | |
1038 | return newsk; | |
1039 | } | |
1040 | ||
634fb979 | 1041 | ireq = inet_rsk(req); |
1da177e4 LT |
1042 | |
1043 | if (sk_acceptq_is_full(sk)) | |
1044 | goto out_overflow; | |
1045 | ||
493f377d | 1046 | if (!dst) { |
f76b33c3 | 1047 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1048 | if (!dst) |
1da177e4 | 1049 | goto out; |
1ab1457c | 1050 | } |
1da177e4 LT |
1051 | |
1052 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1053 | if (!newsk) |
093d2823 | 1054 | goto out_nonewsk; |
1da177e4 | 1055 | |
e6848976 ACM |
1056 | /* |
1057 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1058 | * count here, tcp_create_openreq_child now does this for us, see the | |
1059 | * comment in that function for the gory details. -acme | |
1060 | */ | |
1da177e4 | 1061 | |
59eed279 | 1062 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1063 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1064 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1065 | |
1066 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1067 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1068 | ||
1069 | newtp = tcp_sk(newsk); | |
1070 | newinet = inet_sk(newsk); | |
1071 | newnp = inet6_sk(newsk); | |
1072 | ||
1073 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1074 | ||
634fb979 ED |
1075 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1076 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1077 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1078 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1079 | |
1ab1457c | 1080 | /* Now IPv6 options... |
1da177e4 LT |
1081 | |
1082 | First: no IPv4 options. | |
1083 | */ | |
f6d8bd05 | 1084 | newinet->inet_opt = NULL; |
676a1184 | 1085 | newnp->ipv6_ac_list = NULL; |
d35690be | 1086 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1087 | |
1088 | /* Clone RX bits */ | |
1089 | newnp->rxopt.all = np->rxopt.all; | |
1090 | ||
1da177e4 | 1091 | newnp->pktoptions = NULL; |
1da177e4 | 1092 | newnp->opt = NULL; |
870c3151 | 1093 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1094 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1095 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1096 | if (np->repflow) |
1097 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1098 | |
1099 | /* Clone native IPv6 options from listening socket (if any) | |
1100 | ||
1101 | Yes, keeping reference count would be much more clever, | |
1102 | but we make one more one thing there: reattach optmem | |
1103 | to newsk. | |
1104 | */ | |
45f6fad8 ED |
1105 | opt = rcu_dereference(np->opt); |
1106 | if (opt) { | |
1107 | opt = ipv6_dup_options(newsk, opt); | |
1108 | RCU_INIT_POINTER(newnp->opt, opt); | |
1109 | } | |
d83d8461 | 1110 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1111 | if (opt) |
1112 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1113 | opt->opt_flen; | |
1da177e4 | 1114 | |
81164413 DB |
1115 | tcp_ca_openreq_child(newsk, dst); |
1116 | ||
1da177e4 | 1117 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1118 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1119 | if (tcp_sk(sk)->rx_opt.user_mss && |
1120 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1121 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1122 | ||
1da177e4 LT |
1123 | tcp_initialize_rcv_mss(newsk); |
1124 | ||
c720c7e8 ED |
1125 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1126 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1127 | |
cfb6eeb4 YH |
1128 | #ifdef CONFIG_TCP_MD5SIG |
1129 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1130 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1131 | if (key) { |
cfb6eeb4 YH |
1132 | /* We're using one, so create a matching key |
1133 | * on the newsk structure. If we fail to get | |
1134 | * memory, then we end up not copying the key | |
1135 | * across. Shucks. | |
1136 | */ | |
efe4208f | 1137 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 | 1138 | AF_INET6, key->key, key->keylen, |
7450aaf6 | 1139 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1140 | } |
1141 | #endif | |
1142 | ||
093d2823 | 1143 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1144 | inet_csk_prepare_forced_close(newsk); |
1145 | tcp_done(newsk); | |
093d2823 BS |
1146 | goto out; |
1147 | } | |
5e0724d0 | 1148 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1149 | if (*own_req) { |
49a496c9 | 1150 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1151 | |
1152 | /* Clone pktoptions received with SYN, if we own the req */ | |
1153 | if (ireq->pktopts) { | |
1154 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1155 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1156 | consume_skb(ireq->pktopts); |
1157 | ireq->pktopts = NULL; | |
1158 | if (newnp->pktoptions) | |
1159 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1160 | } | |
ce105008 | 1161 | } |
1da177e4 LT |
1162 | |
1163 | return newsk; | |
1164 | ||
1165 | out_overflow: | |
de0744af | 1166 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1167 | out_nonewsk: |
1da177e4 | 1168 | dst_release(dst); |
093d2823 BS |
1169 | out: |
1170 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1171 | return NULL; |
1172 | } | |
1173 | ||
1da177e4 | 1174 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1175 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1176 | * |
1177 | * We have a potential double-lock case here, so even when | |
1178 | * doing backlog processing we use the BH locking scheme. | |
1179 | * This is because we cannot sleep with the original spinlock | |
1180 | * held. | |
1181 | */ | |
1182 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1183 | { | |
1184 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1185 | struct tcp_sock *tp; | |
1186 | struct sk_buff *opt_skb = NULL; | |
1187 | ||
1188 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1189 | goes to IPv4 receive handler and backlogged. | |
1190 | From backlog it always goes here. Kerboom... | |
1191 | Fortunately, tcp_rcv_established and rcv_established | |
1192 | handle them correctly, but it is not case with | |
1193 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1194 | */ | |
1195 | ||
1196 | if (skb->protocol == htons(ETH_P_IP)) | |
1197 | return tcp_v4_do_rcv(sk, skb); | |
1198 | ||
fda9ef5d | 1199 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1200 | goto discard; |
1201 | ||
1202 | /* | |
1203 | * socket locking is here for SMP purposes as backlog rcv | |
1204 | * is currently called with bh processing disabled. | |
1205 | */ | |
1206 | ||
1207 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1208 | ||
1209 | Yes, guys, it is the only place in our code, where we | |
1210 | may make it not affecting IPv4. | |
1211 | The rest of code is protocol independent, | |
1212 | and I do not like idea to uglify IPv4. | |
1213 | ||
1214 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1215 | looks not very well thought. For now we latch | |
1216 | options, received in the last packet, enqueued | |
1217 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1218 | --ANK (980728) |
1da177e4 LT |
1219 | */ |
1220 | if (np->rxopt.all) | |
7450aaf6 | 1221 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1222 | |
1223 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1224 | struct dst_entry *dst = sk->sk_rx_dst; |
1225 | ||
bdeab991 | 1226 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1227 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1228 | if (dst) { |
1229 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1230 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1231 | dst_release(dst); | |
1232 | sk->sk_rx_dst = NULL; | |
1233 | } | |
1234 | } | |
1235 | ||
c995ae22 | 1236 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1237 | if (opt_skb) |
1238 | goto ipv6_pktoptions; | |
1239 | return 0; | |
1240 | } | |
1241 | ||
12e25e10 | 1242 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1243 | goto csum_err; |
1244 | ||
1ab1457c | 1245 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1246 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1247 | ||
1da177e4 LT |
1248 | if (!nsk) |
1249 | goto discard; | |
1250 | ||
4c99aa40 | 1251 | if (nsk != sk) { |
bdeab991 | 1252 | sock_rps_save_rxhash(nsk, skb); |
38cb5245 | 1253 | sk_mark_napi_id(nsk, skb); |
1da177e4 LT |
1254 | if (tcp_child_process(sk, nsk, skb)) |
1255 | goto reset; | |
1256 | if (opt_skb) | |
1257 | __kfree_skb(opt_skb); | |
1258 | return 0; | |
1259 | } | |
47482f13 | 1260 | } else |
bdeab991 | 1261 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1262 | |
72ab4a86 | 1263 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1264 | goto reset; |
1da177e4 LT |
1265 | if (opt_skb) |
1266 | goto ipv6_pktoptions; | |
1267 | return 0; | |
1268 | ||
1269 | reset: | |
cfb6eeb4 | 1270 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1271 | discard: |
1272 | if (opt_skb) | |
1273 | __kfree_skb(opt_skb); | |
1274 | kfree_skb(skb); | |
1275 | return 0; | |
1276 | csum_err: | |
6a5dc9e5 | 1277 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1278 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1279 | goto discard; |
1280 | ||
1281 | ||
1282 | ipv6_pktoptions: | |
1283 | /* Do you ask, what is it? | |
1284 | ||
1285 | 1. skb was enqueued by tcp. | |
1286 | 2. skb is added to tail of read queue, rather than out of order. | |
1287 | 3. socket is not in passive state. | |
1288 | 4. Finally, it really contains options, which user wants to receive. | |
1289 | */ | |
1290 | tp = tcp_sk(sk); | |
1291 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1292 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1293 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1294 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1295 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1296 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1297 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1298 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1299 | if (np->repflow) |
1300 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1301 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1302 | skb_set_owner_r(opt_skb, sk); |
1303 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1304 | } else { | |
1305 | __kfree_skb(opt_skb); | |
1306 | opt_skb = xchg(&np->pktoptions, NULL); | |
1307 | } | |
1308 | } | |
1309 | ||
800d55f1 | 1310 | kfree_skb(opt_skb); |
1da177e4 LT |
1311 | return 0; |
1312 | } | |
1313 | ||
2dc49d16 ND |
1314 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1315 | const struct tcphdr *th) | |
1316 | { | |
1317 | /* This is tricky: we move IP6CB at its correct location into | |
1318 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1319 | * _decode_session6() uses IP6CB(). | |
1320 | * barrier() makes sure compiler won't play aliasing games. | |
1321 | */ | |
1322 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1323 | sizeof(struct inet6_skb_parm)); | |
1324 | barrier(); | |
1325 | ||
1326 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1327 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1328 | skb->len - th->doff*4); | |
1329 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1330 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1331 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1332 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1333 | TCP_SKB_CB(skb)->sacked = 0; | |
1334 | } | |
1335 | ||
4ad19de8 AK |
1336 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1337 | { | |
1338 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1339 | * and tcp_v6_fill_cb() are going to be called again. | |
1340 | */ | |
1341 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1342 | sizeof(struct inet6_skb_parm)); | |
1343 | } | |
1344 | ||
e5bbef20 | 1345 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1346 | { |
cf533ea5 | 1347 | const struct tcphdr *th; |
b71d1d42 | 1348 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1349 | struct sock *sk; |
1350 | int ret; | |
a86b1e30 | 1351 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1352 | |
1353 | if (skb->pkt_type != PACKET_HOST) | |
1354 | goto discard_it; | |
1355 | ||
1356 | /* | |
1357 | * Count it even if it's bad. | |
1358 | */ | |
63231bdd | 1359 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1360 | |
1361 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1362 | goto discard_it; | |
1363 | ||
aa8223c7 | 1364 | th = tcp_hdr(skb); |
1da177e4 LT |
1365 | |
1366 | if (th->doff < sizeof(struct tcphdr)/4) | |
1367 | goto bad_packet; | |
1368 | if (!pskb_may_pull(skb, th->doff*4)) | |
1369 | goto discard_it; | |
1370 | ||
e4f45b7f | 1371 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1372 | goto csum_error; |
1da177e4 | 1373 | |
aa8223c7 | 1374 | th = tcp_hdr(skb); |
e802af9c | 1375 | hdr = ipv6_hdr(skb); |
1da177e4 | 1376 | |
4bdc3d66 | 1377 | lookup: |
870c3151 | 1378 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1379 | inet6_iif(skb)); |
1da177e4 LT |
1380 | if (!sk) |
1381 | goto no_tcp_socket; | |
1382 | ||
1383 | process: | |
1384 | if (sk->sk_state == TCP_TIME_WAIT) | |
1385 | goto do_time_wait; | |
1386 | ||
079096f1 ED |
1387 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1388 | struct request_sock *req = inet_reqsk(sk); | |
1389 | struct sock *nsk = NULL; | |
1390 | ||
1391 | sk = req->rsk_listener; | |
1392 | tcp_v6_fill_cb(skb, hdr, th); | |
1393 | if (tcp_v6_inbound_md5_hash(sk, skb)) { | |
1394 | reqsk_put(req); | |
1395 | goto discard_it; | |
1396 | } | |
4bdc3d66 | 1397 | if (likely(sk->sk_state == TCP_LISTEN)) { |
079096f1 | 1398 | nsk = tcp_check_req(sk, skb, req, false); |
4bdc3d66 | 1399 | } else { |
f03f2e15 | 1400 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1401 | goto lookup; |
1402 | } | |
079096f1 ED |
1403 | if (!nsk) { |
1404 | reqsk_put(req); | |
1405 | goto discard_it; | |
1406 | } | |
1407 | if (nsk == sk) { | |
1408 | sock_hold(sk); | |
1409 | reqsk_put(req); | |
1410 | tcp_v6_restore_cb(skb); | |
1411 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1412 | tcp_v6_send_reset(nsk, skb); | |
1413 | goto discard_it; | |
1414 | } else { | |
1415 | return 0; | |
1416 | } | |
1417 | } | |
e802af9c SH |
1418 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1419 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1420 | goto discard_and_relse; | |
1421 | } | |
1422 | ||
1da177e4 LT |
1423 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1424 | goto discard_and_relse; | |
1425 | ||
2dc49d16 ND |
1426 | tcp_v6_fill_cb(skb, hdr, th); |
1427 | ||
9ea88a15 DP |
1428 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1429 | goto discard_and_relse; | |
9ea88a15 | 1430 | |
fda9ef5d | 1431 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1432 | goto discard_and_relse; |
1433 | ||
1434 | skb->dev = NULL; | |
1435 | ||
e994b2f0 ED |
1436 | if (sk->sk_state == TCP_LISTEN) { |
1437 | ret = tcp_v6_do_rcv(sk, skb); | |
1438 | goto put_and_return; | |
1439 | } | |
1440 | ||
1441 | sk_incoming_cpu_update(sk); | |
1442 | ||
293b9c42 | 1443 | bh_lock_sock_nested(sk); |
2efd055c | 1444 | tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
1da177e4 LT |
1445 | ret = 0; |
1446 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1447 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1448 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1449 | } else if (unlikely(sk_add_backlog(sk, skb, |
1450 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1451 | bh_unlock_sock(sk); |
6cce09f8 | 1452 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1453 | goto discard_and_relse; |
1454 | } | |
1da177e4 LT |
1455 | bh_unlock_sock(sk); |
1456 | ||
e994b2f0 | 1457 | put_and_return: |
1da177e4 LT |
1458 | sock_put(sk); |
1459 | return ret ? -1 : 0; | |
1460 | ||
1461 | no_tcp_socket: | |
1462 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1463 | goto discard_it; | |
1464 | ||
2dc49d16 ND |
1465 | tcp_v6_fill_cb(skb, hdr, th); |
1466 | ||
12e25e10 | 1467 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1468 | csum_error: |
1469 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1470 | bad_packet: |
63231bdd | 1471 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1472 | } else { |
cfb6eeb4 | 1473 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | discard_it: | |
1da177e4 LT |
1477 | kfree_skb(skb); |
1478 | return 0; | |
1479 | ||
1480 | discard_and_relse: | |
1481 | sock_put(sk); | |
1482 | goto discard_it; | |
1483 | ||
1484 | do_time_wait: | |
1485 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1486 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1487 | goto discard_it; |
1488 | } | |
1489 | ||
2dc49d16 ND |
1490 | tcp_v6_fill_cb(skb, hdr, th); |
1491 | ||
6a5dc9e5 ED |
1492 | if (tcp_checksum_complete(skb)) { |
1493 | inet_twsk_put(inet_twsk(sk)); | |
1494 | goto csum_error; | |
1da177e4 LT |
1495 | } |
1496 | ||
9469c7b4 | 1497 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1498 | case TCP_TW_SYN: |
1499 | { | |
1500 | struct sock *sk2; | |
1501 | ||
c346dca1 | 1502 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1503 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1504 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1505 | ntohs(th->dest), tcp_v6_iif(skb)); |
53b24b8f | 1506 | if (sk2) { |
295ff7ed | 1507 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1508 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1509 | sk = sk2; |
4ad19de8 | 1510 | tcp_v6_restore_cb(skb); |
1da177e4 LT |
1511 | goto process; |
1512 | } | |
1513 | /* Fall through to ACK */ | |
1514 | } | |
1515 | case TCP_TW_ACK: | |
1516 | tcp_v6_timewait_ack(sk, skb); | |
1517 | break; | |
1518 | case TCP_TW_RST: | |
4ad19de8 | 1519 | tcp_v6_restore_cb(skb); |
271c3b9b FW |
1520 | tcp_v6_send_reset(sk, skb); |
1521 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1522 | goto discard_it; | |
4aa956d8 WY |
1523 | case TCP_TW_SUCCESS: |
1524 | ; | |
1da177e4 LT |
1525 | } |
1526 | goto discard_it; | |
1527 | } | |
1528 | ||
c7109986 ED |
1529 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1530 | { | |
1531 | const struct ipv6hdr *hdr; | |
1532 | const struct tcphdr *th; | |
1533 | struct sock *sk; | |
1534 | ||
1535 | if (skb->pkt_type != PACKET_HOST) | |
1536 | return; | |
1537 | ||
1538 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1539 | return; | |
1540 | ||
1541 | hdr = ipv6_hdr(skb); | |
1542 | th = tcp_hdr(skb); | |
1543 | ||
1544 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1545 | return; | |
1546 | ||
870c3151 | 1547 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1548 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1549 | &hdr->saddr, th->source, | |
1550 | &hdr->daddr, ntohs(th->dest), | |
1551 | inet6_iif(skb)); | |
1552 | if (sk) { | |
1553 | skb->sk = sk; | |
1554 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1555 | if (sk_fullsock(sk)) { |
d0c294c5 | 1556 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1557 | |
c7109986 | 1558 | if (dst) |
5d299f3d | 1559 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1560 | if (dst && |
f3f12135 | 1561 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1562 | skb_dst_set_noref(skb, dst); |
1563 | } | |
1564 | } | |
1565 | } | |
1566 | ||
ccb7c410 DM |
1567 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1568 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1569 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1570 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1571 | }; |
1572 | ||
3b401a81 | 1573 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1574 | .queue_xmit = inet6_csk_xmit, |
1575 | .send_check = tcp_v6_send_check, | |
1576 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1577 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1578 | .conn_request = tcp_v6_conn_request, |
1579 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1580 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1581 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1582 | .setsockopt = ipv6_setsockopt, |
1583 | .getsockopt = ipv6_getsockopt, | |
1584 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1585 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1586 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1587 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1588 | .compat_setsockopt = compat_ipv6_setsockopt, |
1589 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1590 | #endif |
4fab9071 | 1591 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1592 | }; |
1593 | ||
cfb6eeb4 | 1594 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1595 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1596 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1597 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1598 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1599 | }; |
a928630a | 1600 | #endif |
cfb6eeb4 | 1601 | |
1da177e4 LT |
1602 | /* |
1603 | * TCP over IPv4 via INET6 API | |
1604 | */ | |
3b401a81 | 1605 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1606 | .queue_xmit = ip_queue_xmit, |
1607 | .send_check = tcp_v4_send_check, | |
1608 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1609 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1610 | .conn_request = tcp_v6_conn_request, |
1611 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1612 | .net_header_len = sizeof(struct iphdr), |
1613 | .setsockopt = ipv6_setsockopt, | |
1614 | .getsockopt = ipv6_getsockopt, | |
1615 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1616 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1617 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1618 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1619 | .compat_setsockopt = compat_ipv6_setsockopt, |
1620 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1621 | #endif |
4fab9071 | 1622 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1623 | }; |
1624 | ||
cfb6eeb4 | 1625 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1626 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1627 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1628 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1629 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1630 | }; |
a928630a | 1631 | #endif |
cfb6eeb4 | 1632 | |
1da177e4 LT |
1633 | /* NOTE: A lot of things set to zero explicitly by call to |
1634 | * sk_alloc() so need not be done here. | |
1635 | */ | |
1636 | static int tcp_v6_init_sock(struct sock *sk) | |
1637 | { | |
6687e988 | 1638 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1639 | |
900f65d3 | 1640 | tcp_init_sock(sk); |
1da177e4 | 1641 | |
8292a17a | 1642 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1643 | |
cfb6eeb4 | 1644 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1645 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1646 | #endif |
1647 | ||
1da177e4 LT |
1648 | return 0; |
1649 | } | |
1650 | ||
7d06b2e0 | 1651 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1652 | { |
1da177e4 | 1653 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1654 | inet6_destroy_sock(sk); |
1da177e4 LT |
1655 | } |
1656 | ||
952a10be | 1657 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1658 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1659 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1660 | const struct request_sock *req, int i) |
1da177e4 | 1661 | { |
fa76ce73 | 1662 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1663 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1664 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1665 | |
1666 | if (ttd < 0) | |
1667 | ttd = 0; | |
1668 | ||
1da177e4 LT |
1669 | seq_printf(seq, |
1670 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1671 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1672 | i, |
1673 | src->s6_addr32[0], src->s6_addr32[1], | |
1674 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1675 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1676 | dest->s6_addr32[0], dest->s6_addr32[1], |
1677 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1678 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1679 | TCP_SYN_RECV, |
4c99aa40 | 1680 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1681 | 1, /* timers active (only the expire timer) */ |
1682 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1683 | req->num_timeout, |
aa3a0c8c ED |
1684 | from_kuid_munged(seq_user_ns(seq), |
1685 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1686 | 0, /* non standard timer */ |
1da177e4 LT |
1687 | 0, /* open_requests have no inode */ |
1688 | 0, req); | |
1689 | } | |
1690 | ||
1691 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1692 | { | |
b71d1d42 | 1693 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1694 | __u16 destp, srcp; |
1695 | int timer_active; | |
1696 | unsigned long timer_expires; | |
cf533ea5 ED |
1697 | const struct inet_sock *inet = inet_sk(sp); |
1698 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1699 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1700 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1701 | int rx_queue; |
1702 | int state; | |
1da177e4 | 1703 | |
efe4208f ED |
1704 | dest = &sp->sk_v6_daddr; |
1705 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1706 | destp = ntohs(inet->inet_dport); |
1707 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1708 | |
1709 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1710 | timer_active = 1; |
463c84b9 ACM |
1711 | timer_expires = icsk->icsk_timeout; |
1712 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1713 | timer_active = 4; |
463c84b9 | 1714 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1715 | } else if (timer_pending(&sp->sk_timer)) { |
1716 | timer_active = 2; | |
1717 | timer_expires = sp->sk_timer.expires; | |
1718 | } else { | |
1719 | timer_active = 0; | |
1720 | timer_expires = jiffies; | |
1721 | } | |
1722 | ||
00fd38d9 ED |
1723 | state = sk_state_load(sp); |
1724 | if (state == TCP_LISTEN) | |
1725 | rx_queue = sp->sk_ack_backlog; | |
1726 | else | |
1727 | /* Because we don't lock the socket, | |
1728 | * we might find a transient negative value. | |
1729 | */ | |
1730 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1731 | ||
1da177e4 LT |
1732 | seq_printf(seq, |
1733 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1734 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1735 | i, |
1736 | src->s6_addr32[0], src->s6_addr32[1], | |
1737 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1738 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1739 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1740 | state, |
1741 | tp->write_seq - tp->snd_una, | |
1742 | rx_queue, | |
1da177e4 | 1743 | timer_active, |
a399a805 | 1744 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1745 | icsk->icsk_retransmits, |
a7cb5a49 | 1746 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1747 | icsk->icsk_probes_out, |
1da177e4 LT |
1748 | sock_i_ino(sp), |
1749 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1750 | jiffies_to_clock_t(icsk->icsk_rto), |
1751 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1752 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1753 | tp->snd_cwnd, |
00fd38d9 | 1754 | state == TCP_LISTEN ? |
0536fcc0 | 1755 | fastopenq->max_qlen : |
0a672f74 | 1756 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1757 | ); |
1758 | } | |
1759 | ||
1ab1457c | 1760 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1761 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1762 | { |
789f558c | 1763 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1764 | const struct in6_addr *dest, *src; |
1da177e4 | 1765 | __u16 destp, srcp; |
1da177e4 | 1766 | |
efe4208f ED |
1767 | dest = &tw->tw_v6_daddr; |
1768 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1769 | destp = ntohs(tw->tw_dport); |
1770 | srcp = ntohs(tw->tw_sport); | |
1771 | ||
1772 | seq_printf(seq, | |
1773 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1774 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1775 | i, |
1776 | src->s6_addr32[0], src->s6_addr32[1], | |
1777 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1778 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1779 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1780 | tw->tw_substate, 0, 0, | |
a399a805 | 1781 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1782 | atomic_read(&tw->tw_refcnt), tw); |
1783 | } | |
1784 | ||
1da177e4 LT |
1785 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1786 | { | |
1787 | struct tcp_iter_state *st; | |
05dbc7b5 | 1788 | struct sock *sk = v; |
1da177e4 LT |
1789 | |
1790 | if (v == SEQ_START_TOKEN) { | |
1791 | seq_puts(seq, | |
1792 | " sl " | |
1793 | "local_address " | |
1794 | "remote_address " | |
1795 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1796 | " uid timeout inode\n"); | |
1797 | goto out; | |
1798 | } | |
1799 | st = seq->private; | |
1800 | ||
079096f1 ED |
1801 | if (sk->sk_state == TCP_TIME_WAIT) |
1802 | get_timewait6_sock(seq, v, st->num); | |
1803 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1804 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1805 | else |
1806 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1807 | out: |
1808 | return 0; | |
1809 | } | |
1810 | ||
73cb88ec AV |
1811 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1812 | .owner = THIS_MODULE, | |
1813 | .open = tcp_seq_open, | |
1814 | .read = seq_read, | |
1815 | .llseek = seq_lseek, | |
1816 | .release = seq_release_net | |
1817 | }; | |
1818 | ||
1da177e4 | 1819 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1820 | .name = "tcp6", |
1821 | .family = AF_INET6, | |
73cb88ec | 1822 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1823 | .seq_ops = { |
1824 | .show = tcp6_seq_show, | |
1825 | }, | |
1da177e4 LT |
1826 | }; |
1827 | ||
2c8c1e72 | 1828 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1829 | { |
6f8b13bc | 1830 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1831 | } |
1832 | ||
6f8b13bc | 1833 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1834 | { |
6f8b13bc | 1835 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1836 | } |
1837 | #endif | |
1838 | ||
f77d6021 ED |
1839 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1840 | { | |
1841 | struct inet_sock *inet = inet_sk(sk); | |
1842 | ||
1843 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1844 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1845 | ||
1846 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1847 | memset(&inet->pinet6 + 1, 0, size); | |
1848 | } | |
1849 | ||
1da177e4 LT |
1850 | struct proto tcpv6_prot = { |
1851 | .name = "TCPv6", | |
1852 | .owner = THIS_MODULE, | |
1853 | .close = tcp_close, | |
1854 | .connect = tcp_v6_connect, | |
1855 | .disconnect = tcp_disconnect, | |
463c84b9 | 1856 | .accept = inet_csk_accept, |
1da177e4 LT |
1857 | .ioctl = tcp_ioctl, |
1858 | .init = tcp_v6_init_sock, | |
1859 | .destroy = tcp_v6_destroy_sock, | |
1860 | .shutdown = tcp_shutdown, | |
1861 | .setsockopt = tcp_setsockopt, | |
1862 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1863 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1864 | .sendmsg = tcp_sendmsg, |
1865 | .sendpage = tcp_sendpage, | |
1da177e4 | 1866 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1867 | .release_cb = tcp_release_cb, |
77a6a471 | 1868 | .hash = inet_hash, |
ab1e0a13 ACM |
1869 | .unhash = inet_unhash, |
1870 | .get_port = inet_csk_get_port, | |
1da177e4 | 1871 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1872 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1873 | .sockets_allocated = &tcp_sockets_allocated, |
1874 | .memory_allocated = &tcp_memory_allocated, | |
1875 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1876 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1877 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1878 | .sysctl_wmem = sysctl_tcp_wmem, |
1879 | .sysctl_rmem = sysctl_tcp_rmem, | |
1880 | .max_header = MAX_TCP_HEADER, | |
1881 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1882 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1883 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1884 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1885 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1886 | .no_autobind = true, |
543d9cfe ACM |
1887 | #ifdef CONFIG_COMPAT |
1888 | .compat_setsockopt = compat_tcp_setsockopt, | |
1889 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 1890 | #endif |
f77d6021 | 1891 | .clear_sk = tcp_v6_clear_sk, |
c1e64e29 | 1892 | .diag_destroy = tcp_abort, |
1da177e4 LT |
1893 | }; |
1894 | ||
41135cc8 | 1895 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1896 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1897 | .handler = tcp_v6_rcv, |
1898 | .err_handler = tcp_v6_err, | |
1899 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1900 | }; | |
1901 | ||
1da177e4 LT |
1902 | static struct inet_protosw tcpv6_protosw = { |
1903 | .type = SOCK_STREAM, | |
1904 | .protocol = IPPROTO_TCP, | |
1905 | .prot = &tcpv6_prot, | |
1906 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1907 | .flags = INET_PROTOSW_PERMANENT | |
1908 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1909 | }; |
1910 | ||
2c8c1e72 | 1911 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1912 | { |
5677242f DL |
1913 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1914 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1915 | } |
1916 | ||
2c8c1e72 | 1917 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1918 | { |
5677242f | 1919 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1920 | } |
1921 | ||
2c8c1e72 | 1922 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1923 | { |
1924 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1925 | } |
1926 | ||
1927 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1928 | .init = tcpv6_net_init, |
1929 | .exit = tcpv6_net_exit, | |
1930 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1931 | }; |
1932 | ||
7f4e4868 | 1933 | int __init tcpv6_init(void) |
1da177e4 | 1934 | { |
7f4e4868 DL |
1935 | int ret; |
1936 | ||
3336288a VY |
1937 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1938 | if (ret) | |
c6b641a4 | 1939 | goto out; |
3336288a | 1940 | |
1da177e4 | 1941 | /* register inet6 protocol */ |
7f4e4868 DL |
1942 | ret = inet6_register_protosw(&tcpv6_protosw); |
1943 | if (ret) | |
1944 | goto out_tcpv6_protocol; | |
1945 | ||
93ec926b | 1946 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1947 | if (ret) |
1948 | goto out_tcpv6_protosw; | |
1949 | out: | |
1950 | return ret; | |
ae0f7d5f | 1951 | |
7f4e4868 DL |
1952 | out_tcpv6_protosw: |
1953 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1954 | out_tcpv6_protocol: |
1955 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1956 | goto out; |
1957 | } | |
1958 | ||
09f7709f | 1959 | void tcpv6_exit(void) |
7f4e4868 | 1960 | { |
93ec926b | 1961 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1962 | inet6_unregister_protosw(&tcpv6_protosw); |
1963 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1964 | } |