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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> |
d1a4c0b3 | 64 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 65 | #include <net/busy_poll.h> |
1da177e4 | 66 | |
1da177e4 LT |
67 | #include <linux/proc_fs.h> |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
3b401a81 SH |
79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
84 | #else |
85 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 86 | const struct in6_addr *addr) |
9501f972 YH |
87 | { |
88 | return NULL; | |
89 | } | |
a928630a | 90 | #endif |
1da177e4 | 91 | |
fae6ef87 NC |
92 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
93 | { | |
94 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 95 | |
ca777eff ED |
96 | if (dst) { |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
102 | if (rt->rt6i_node) | |
103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
104 | } | |
fae6ef87 NC |
105 | } |
106 | ||
cf533ea5 | 107 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 108 | { |
0660e03f ACM |
109 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
110 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
111 | tcp_hdr(skb)->dest, |
112 | tcp_hdr(skb)->source); | |
1da177e4 LT |
113 | } |
114 | ||
1ab1457c | 115 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
116 | int addr_len) |
117 | { | |
118 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 119 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 120 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
121 | struct ipv6_pinfo *np = inet6_sk(sk); |
122 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 123 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 124 | struct rt6_info *rt; |
4c9483b2 | 125 | struct flowi6 fl6; |
1da177e4 LT |
126 | struct dst_entry *dst; |
127 | int addr_type; | |
128 | int err; | |
129 | ||
1ab1457c | 130 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
131 | return -EINVAL; |
132 | ||
1ab1457c | 133 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 134 | return -EAFNOSUPPORT; |
1da177e4 | 135 | |
4c9483b2 | 136 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
137 | |
138 | if (np->sndflow) { | |
4c9483b2 DM |
139 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
140 | IP6_ECN_flow_init(fl6.flowlabel); | |
141 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 142 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 143 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
144 | if (flowlabel == NULL) |
145 | return -EINVAL; | |
1da177e4 LT |
146 | fl6_sock_release(flowlabel); |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
1ab1457c YH |
151 | * connect() to INADDR_ANY means loopback (BSD'ism). |
152 | */ | |
153 | ||
4c99aa40 | 154 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 155 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
156 | |
157 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
158 | ||
4c99aa40 | 159 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
160 | return -ENETUNREACH; |
161 | ||
162 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
163 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
164 | usin->sin6_scope_id) { | |
165 | /* If interface is set while binding, indices | |
166 | * must coincide. | |
167 | */ | |
168 | if (sk->sk_bound_dev_if && | |
169 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
170 | return -EINVAL; | |
171 | ||
172 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
173 | } | |
174 | ||
175 | /* Connect to link-local address requires an interface */ | |
176 | if (!sk->sk_bound_dev_if) | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 181 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
182 | tp->rx_opt.ts_recent = 0; |
183 | tp->rx_opt.ts_recent_stamp = 0; | |
184 | tp->write_seq = 0; | |
185 | } | |
186 | ||
efe4208f | 187 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 188 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
189 | |
190 | /* | |
191 | * TCP over IPv4 | |
192 | */ | |
193 | ||
194 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 195 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
196 | struct sockaddr_in sin; |
197 | ||
198 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
199 | ||
200 | if (__ipv6_only_sock(sk)) | |
201 | return -ENETUNREACH; | |
202 | ||
203 | sin.sin_family = AF_INET; | |
204 | sin.sin_port = usin->sin6_port; | |
205 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
206 | ||
d83d8461 | 207 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 208 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
209 | #ifdef CONFIG_TCP_MD5SIG |
210 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
211 | #endif | |
1da177e4 LT |
212 | |
213 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
214 | ||
215 | if (err) { | |
d83d8461 ACM |
216 | icsk->icsk_ext_hdr_len = exthdrlen; |
217 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 218 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
219 | #ifdef CONFIG_TCP_MD5SIG |
220 | tp->af_specific = &tcp_sock_ipv6_specific; | |
221 | #endif | |
1da177e4 | 222 | goto failure; |
1da177e4 | 223 | } |
d1e559d0 | 224 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
225 | |
226 | return err; | |
227 | } | |
228 | ||
efe4208f ED |
229 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
230 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 231 | |
4c9483b2 | 232 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 233 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 234 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
235 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
236 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
237 | fl6.fl6_dport = usin->sin6_port; |
238 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 239 | |
4c9483b2 | 240 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 241 | |
4c9483b2 | 242 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 243 | |
0e0d44ab | 244 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
245 | if (IS_ERR(dst)) { |
246 | err = PTR_ERR(dst); | |
1da177e4 | 247 | goto failure; |
14e50e57 | 248 | } |
1da177e4 LT |
249 | |
250 | if (saddr == NULL) { | |
4c9483b2 | 251 | saddr = &fl6.saddr; |
efe4208f | 252 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
253 | } |
254 | ||
255 | /* set the source address */ | |
4e3fd7a0 | 256 | np->saddr = *saddr; |
c720c7e8 | 257 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 258 | |
f83ef8c0 | 259 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 260 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 261 | |
493f377d DM |
262 | rt = (struct rt6_info *) dst; |
263 | if (tcp_death_row.sysctl_tw_recycle && | |
264 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 265 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 266 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 267 | |
d83d8461 | 268 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 269 | if (np->opt) |
d83d8461 ACM |
270 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
271 | np->opt->opt_nflen); | |
1da177e4 LT |
272 | |
273 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
274 | ||
c720c7e8 | 275 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
276 | |
277 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 278 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
279 | if (err) |
280 | goto late_failure; | |
281 | ||
9e7ceb06 SP |
282 | ip6_set_txhash(sk); |
283 | ||
2b916477 | 284 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 285 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 286 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
287 | inet->inet_sport, |
288 | inet->inet_dport); | |
1da177e4 LT |
289 | |
290 | err = tcp_connect(sk); | |
291 | if (err) | |
292 | goto late_failure; | |
293 | ||
294 | return 0; | |
295 | ||
296 | late_failure: | |
297 | tcp_set_state(sk, TCP_CLOSE); | |
298 | __sk_dst_reset(sk); | |
299 | failure: | |
c720c7e8 | 300 | inet->inet_dport = 0; |
1da177e4 LT |
301 | sk->sk_route_caps = 0; |
302 | return err; | |
303 | } | |
304 | ||
563d34d0 ED |
305 | static void tcp_v6_mtu_reduced(struct sock *sk) |
306 | { | |
307 | struct dst_entry *dst; | |
308 | ||
309 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
310 | return; | |
311 | ||
312 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
313 | if (!dst) | |
314 | return; | |
315 | ||
316 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
317 | tcp_sync_mss(sk, dst_mtu(dst)); | |
318 | tcp_simple_retransmit(sk); | |
319 | } | |
320 | } | |
321 | ||
1da177e4 | 322 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 323 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 324 | { |
4c99aa40 | 325 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 326 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
327 | struct net *net = dev_net(skb->dev); |
328 | struct request_sock *fastopen; | |
1da177e4 | 329 | struct ipv6_pinfo *np; |
1ab1457c | 330 | struct tcp_sock *tp; |
0a672f74 | 331 | __u32 seq, snd_una; |
2215089b ED |
332 | struct sock *sk; |
333 | int err; | |
1da177e4 | 334 | |
2215089b ED |
335 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
336 | &hdr->daddr, th->dest, | |
337 | &hdr->saddr, ntohs(th->source), | |
338 | skb->dev->ifindex); | |
1da177e4 | 339 | |
2215089b | 340 | if (!sk) { |
e41b5368 DL |
341 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
342 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
343 | return; |
344 | } | |
345 | ||
346 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 347 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
348 | return; |
349 | } | |
2215089b ED |
350 | seq = ntohl(th->seq); |
351 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
352 | return tcp_req_err(sk, seq); | |
1da177e4 LT |
353 | |
354 | bh_lock_sock(sk); | |
563d34d0 | 355 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 356 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
357 | |
358 | if (sk->sk_state == TCP_CLOSE) | |
359 | goto out; | |
360 | ||
e802af9c SH |
361 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
362 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
363 | goto out; | |
364 | } | |
365 | ||
1da177e4 | 366 | tp = tcp_sk(sk); |
0a672f74 YC |
367 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
368 | fastopen = tp->fastopen_rsk; | |
369 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 370 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 371 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 372 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
373 | goto out; |
374 | } | |
375 | ||
376 | np = inet6_sk(sk); | |
377 | ||
ec18d9a2 DM |
378 | if (type == NDISC_REDIRECT) { |
379 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
380 | ||
1ed5c48f | 381 | if (dst) |
6700c270 | 382 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 383 | goto out; |
ec18d9a2 DM |
384 | } |
385 | ||
1da177e4 | 386 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
387 | /* We are not interested in TCP_LISTEN and open_requests |
388 | * (SYN-ACKs send out by Linux are always <576bytes so | |
389 | * they should go through unfragmented). | |
390 | */ | |
391 | if (sk->sk_state == TCP_LISTEN) | |
392 | goto out; | |
393 | ||
93b36cf3 HFS |
394 | if (!ip6_sk_accept_pmtu(sk)) |
395 | goto out; | |
396 | ||
563d34d0 ED |
397 | tp->mtu_info = ntohl(info); |
398 | if (!sock_owned_by_user(sk)) | |
399 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
400 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
401 | &tp->tsq_flags)) | |
402 | sock_hold(sk); | |
1da177e4 LT |
403 | goto out; |
404 | } | |
405 | ||
406 | icmpv6_err_convert(type, code, &err); | |
407 | ||
60236fdd | 408 | /* Might be for an request_sock */ |
1da177e4 | 409 | switch (sk->sk_state) { |
1da177e4 | 410 | case TCP_SYN_SENT: |
0a672f74 YC |
411 | case TCP_SYN_RECV: |
412 | /* Only in fast or simultaneous open. If a fast open socket is | |
413 | * is already accepted it is treated as a connected one below. | |
414 | */ | |
415 | if (fastopen && fastopen->sk == NULL) | |
416 | break; | |
417 | ||
1da177e4 | 418 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
419 | sk->sk_err = err; |
420 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
421 | ||
422 | tcp_done(sk); | |
423 | } else | |
424 | sk->sk_err_soft = err; | |
425 | goto out; | |
426 | } | |
427 | ||
428 | if (!sock_owned_by_user(sk) && np->recverr) { | |
429 | sk->sk_err = err; | |
430 | sk->sk_error_report(sk); | |
431 | } else | |
432 | sk->sk_err_soft = err; | |
433 | ||
434 | out: | |
435 | bh_unlock_sock(sk); | |
436 | sock_put(sk); | |
437 | } | |
438 | ||
439 | ||
9f10d3f6 | 440 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 441 | struct flowi *fl, |
3840a06e | 442 | struct request_sock *req, |
3a19ce0e DL |
443 | u16 queue_mapping, |
444 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 445 | { |
634fb979 | 446 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 447 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 448 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 449 | struct sk_buff *skb; |
9494218f | 450 | int err = -ENOMEM; |
1da177e4 | 451 | |
9f10d3f6 NC |
452 | /* First, grab a route. */ |
453 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 454 | goto done; |
9494218f | 455 | |
3a19ce0e | 456 | skb = tcp_make_synack(sk, dst, req, foc); |
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; |
df3687ff FF |
463 | if (np->repflow && (ireq->pktopts != NULL)) |
464 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
465 | ||
fff32699 | 466 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 467 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
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 YH |
481 | #ifdef CONFIG_TCP_MD5SIG |
482 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(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 | ||
488 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
489 | struct sock *addr_sk) | |
490 | { | |
efe4208f | 491 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
492 | } |
493 | ||
494 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
495 | struct request_sock *req) | |
496 | { | |
634fb979 | 497 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
498 | } |
499 | ||
4aa956d8 WY |
500 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
501 | int optlen) | |
cfb6eeb4 YH |
502 | { |
503 | struct tcp_md5sig cmd; | |
504 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
505 | |
506 | if (optlen < sizeof(cmd)) | |
507 | return -EINVAL; | |
508 | ||
509 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
510 | return -EFAULT; | |
511 | ||
512 | if (sin6->sin6_family != AF_INET6) | |
513 | return -EINVAL; | |
514 | ||
515 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 516 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
517 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
518 | AF_INET); | |
519 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
520 | AF_INET6); | |
cfb6eeb4 YH |
521 | } |
522 | ||
523 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
524 | return -EINVAL; | |
525 | ||
a915da9b ED |
526 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
527 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
528 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 529 | |
a915da9b ED |
530 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
531 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
532 | } |
533 | ||
49a72dfb | 534 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
535 | const struct in6_addr *daddr, |
536 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 537 | { |
cfb6eeb4 | 538 | struct tcp6_pseudohdr *bp; |
49a72dfb | 539 | struct scatterlist sg; |
8d26d76d | 540 | |
cfb6eeb4 | 541 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 542 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
543 | bp->saddr = *saddr; |
544 | bp->daddr = *daddr; | |
49a72dfb | 545 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 546 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 547 | |
49a72dfb AL |
548 | sg_init_one(&sg, bp, sizeof(*bp)); |
549 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
550 | } | |
c7da57a1 | 551 | |
49a72dfb | 552 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 553 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 554 | const struct tcphdr *th) |
49a72dfb AL |
555 | { |
556 | struct tcp_md5sig_pool *hp; | |
557 | struct hash_desc *desc; | |
558 | ||
559 | hp = tcp_get_md5sig_pool(); | |
560 | if (!hp) | |
561 | goto clear_hash_noput; | |
562 | desc = &hp->md5_desc; | |
563 | ||
564 | if (crypto_hash_init(desc)) | |
565 | goto clear_hash; | |
566 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
567 | goto clear_hash; | |
568 | if (tcp_md5_hash_header(hp, th)) | |
569 | goto clear_hash; | |
570 | if (tcp_md5_hash_key(hp, key)) | |
571 | goto clear_hash; | |
572 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 573 | goto clear_hash; |
cfb6eeb4 | 574 | |
cfb6eeb4 | 575 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 576 | return 0; |
49a72dfb | 577 | |
cfb6eeb4 YH |
578 | clear_hash: |
579 | tcp_put_md5sig_pool(); | |
580 | clear_hash_noput: | |
581 | memset(md5_hash, 0, 16); | |
49a72dfb | 582 | return 1; |
cfb6eeb4 YH |
583 | } |
584 | ||
39f8e58e ED |
585 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
586 | const struct tcp_md5sig_key *key, | |
318cf7aa | 587 | const struct sock *sk, |
318cf7aa | 588 | const struct sk_buff *skb) |
cfb6eeb4 | 589 | { |
b71d1d42 | 590 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
591 | struct tcp_md5sig_pool *hp; |
592 | struct hash_desc *desc; | |
318cf7aa | 593 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 594 | |
39f8e58e ED |
595 | if (sk) { /* valid for establish/request sockets */ |
596 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 597 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 598 | } else { |
b71d1d42 | 599 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
600 | saddr = &ip6h->saddr; |
601 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 602 | } |
49a72dfb AL |
603 | |
604 | hp = tcp_get_md5sig_pool(); | |
605 | if (!hp) | |
606 | goto clear_hash_noput; | |
607 | desc = &hp->md5_desc; | |
608 | ||
609 | if (crypto_hash_init(desc)) | |
610 | goto clear_hash; | |
611 | ||
612 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
613 | goto clear_hash; | |
614 | if (tcp_md5_hash_header(hp, th)) | |
615 | goto clear_hash; | |
616 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
617 | goto clear_hash; | |
618 | if (tcp_md5_hash_key(hp, key)) | |
619 | goto clear_hash; | |
620 | if (crypto_hash_final(desc, md5_hash)) | |
621 | goto clear_hash; | |
622 | ||
623 | tcp_put_md5sig_pool(); | |
624 | return 0; | |
625 | ||
626 | clear_hash: | |
627 | tcp_put_md5sig_pool(); | |
628 | clear_hash_noput: | |
629 | memset(md5_hash, 0, 16); | |
630 | return 1; | |
cfb6eeb4 YH |
631 | } |
632 | ||
ff74e23f | 633 | static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 634 | { |
cf533ea5 | 635 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 636 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 637 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 638 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 639 | int genhash; |
cfb6eeb4 YH |
640 | u8 newhash[16]; |
641 | ||
642 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 643 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 644 | |
785957d3 DM |
645 | /* We've parsed the options - do we have a hash? */ |
646 | if (!hash_expected && !hash_location) | |
ff74e23f | 647 | return false; |
785957d3 DM |
648 | |
649 | if (hash_expected && !hash_location) { | |
650 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
ff74e23f | 651 | return true; |
cfb6eeb4 YH |
652 | } |
653 | ||
785957d3 DM |
654 | if (!hash_expected && hash_location) { |
655 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
ff74e23f | 656 | return true; |
cfb6eeb4 YH |
657 | } |
658 | ||
659 | /* check the signature */ | |
49a72dfb AL |
660 | genhash = tcp_v6_md5_hash_skb(newhash, |
661 | hash_expected, | |
39f8e58e | 662 | NULL, skb); |
49a72dfb | 663 | |
cfb6eeb4 | 664 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
665 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
666 | genhash ? "failed" : "mismatch", | |
667 | &ip6h->saddr, ntohs(th->source), | |
668 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 669 | return true; |
cfb6eeb4 | 670 | } |
ff74e23f | 671 | return false; |
cfb6eeb4 YH |
672 | } |
673 | #endif | |
674 | ||
16bea70a OP |
675 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
676 | struct sk_buff *skb) | |
677 | { | |
678 | struct inet_request_sock *ireq = inet_rsk(req); | |
679 | struct ipv6_pinfo *np = inet6_sk(sk); | |
680 | ||
681 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
682 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
683 | ||
16bea70a OP |
684 | /* So that link locals have meaning */ |
685 | if (!sk->sk_bound_dev_if && | |
686 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
870c3151 | 687 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 688 | |
04317daf | 689 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
a224772d ED |
690 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
691 | np->rxopt.bits.rxinfo || | |
16bea70a OP |
692 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
693 | np->rxopt.bits.rxohlim || np->repflow)) { | |
694 | atomic_inc(&skb->users); | |
695 | ireq->pktopts = skb; | |
696 | } | |
3f66b083 | 697 | ireq->ireq_family = AF_INET6; |
16bea70a OP |
698 | } |
699 | ||
d94e0417 OP |
700 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
701 | const struct request_sock *req, | |
702 | bool *strict) | |
703 | { | |
704 | if (strict) | |
705 | *strict = true; | |
706 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
707 | } | |
708 | ||
c6aefafb | 709 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 710 | .family = AF_INET6, |
2e6599cb | 711 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 712 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
713 | .send_ack = tcp_v6_reqsk_send_ack, |
714 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 715 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 716 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
717 | }; |
718 | ||
b2e4b3de | 719 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
720 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
721 | sizeof(struct ipv6hdr), | |
16bea70a | 722 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 723 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 724 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 725 | #endif |
16bea70a | 726 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
727 | #ifdef CONFIG_SYN_COOKIES |
728 | .cookie_init_seq = cookie_v6_init_sequence, | |
729 | #endif | |
d94e0417 | 730 | .route_req = tcp_v6_route_req, |
936b8bdb | 731 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 732 | .send_synack = tcp_v6_send_synack, |
695da14e | 733 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 734 | }; |
cfb6eeb4 | 735 | |
0f85feae ED |
736 | static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq, |
737 | u32 ack, u32 win, u32 tsval, u32 tsecr, | |
738 | int oif, struct tcp_md5sig_key *key, int rst, | |
739 | u8 tclass, u32 label) | |
1da177e4 | 740 | { |
cf533ea5 ED |
741 | const struct tcphdr *th = tcp_hdr(skb); |
742 | struct tcphdr *t1; | |
1da177e4 | 743 | struct sk_buff *buff; |
4c9483b2 | 744 | struct flowi6 fl6; |
0f85feae | 745 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 746 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 747 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 748 | struct dst_entry *dst; |
81ada62d | 749 | __be32 *topt; |
1da177e4 | 750 | |
ee684b6f | 751 | if (tsecr) |
626e264d | 752 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 753 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
754 | if (key) |
755 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
756 | #endif | |
757 | ||
cfb6eeb4 | 758 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 759 | GFP_ATOMIC); |
1ab1457c YH |
760 | if (buff == NULL) |
761 | return; | |
1da177e4 | 762 | |
cfb6eeb4 | 763 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 764 | |
cfb6eeb4 | 765 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 766 | skb_reset_transport_header(buff); |
1da177e4 LT |
767 | |
768 | /* Swap the send and the receive. */ | |
769 | memset(t1, 0, sizeof(*t1)); | |
770 | t1->dest = th->source; | |
771 | t1->source = th->dest; | |
cfb6eeb4 | 772 | t1->doff = tot_len / 4; |
626e264d IJ |
773 | t1->seq = htonl(seq); |
774 | t1->ack_seq = htonl(ack); | |
775 | t1->ack = !rst || !th->ack; | |
776 | t1->rst = rst; | |
777 | t1->window = htons(win); | |
1da177e4 | 778 | |
81ada62d IJ |
779 | topt = (__be32 *)(t1 + 1); |
780 | ||
ee684b6f | 781 | if (tsecr) { |
626e264d IJ |
782 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
783 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
784 | *topt++ = htonl(tsval); |
785 | *topt++ = htonl(tsecr); | |
626e264d IJ |
786 | } |
787 | ||
cfb6eeb4 YH |
788 | #ifdef CONFIG_TCP_MD5SIG |
789 | if (key) { | |
81ada62d IJ |
790 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
791 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
792 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
793 | &ipv6_hdr(skb)->saddr, |
794 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
795 | } |
796 | #endif | |
797 | ||
4c9483b2 | 798 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
799 | fl6.daddr = ipv6_hdr(skb)->saddr; |
800 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 801 | fl6.flowlabel = label; |
1da177e4 | 802 | |
e5700aff DM |
803 | buff->ip_summed = CHECKSUM_PARTIAL; |
804 | buff->csum = 0; | |
805 | ||
4c9483b2 | 806 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 807 | |
4c9483b2 | 808 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 809 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 810 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
811 | else |
812 | fl6.flowi6_oif = oif; | |
e110861f | 813 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
814 | fl6.fl6_dport = t1->dest; |
815 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 816 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 817 | |
c20121ae DL |
818 | /* Pass a socket to ip6_dst_lookup either it is for RST |
819 | * Underlying function will use this to retrieve the network | |
820 | * namespace | |
821 | */ | |
0e0d44ab | 822 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
823 | if (!IS_ERR(dst)) { |
824 | skb_dst_set(buff, dst); | |
b903d324 | 825 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
826 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
827 | if (rst) | |
828 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
829 | return; | |
1da177e4 LT |
830 | } |
831 | ||
832 | kfree_skb(buff); | |
833 | } | |
834 | ||
626e264d | 835 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 836 | { |
cf533ea5 | 837 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 838 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 839 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
840 | #ifdef CONFIG_TCP_MD5SIG |
841 | const __u8 *hash_location = NULL; | |
842 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
843 | unsigned char newhash[16]; | |
844 | int genhash; | |
845 | struct sock *sk1 = NULL; | |
846 | #endif | |
9c76a114 | 847 | int oif; |
1da177e4 | 848 | |
626e264d | 849 | if (th->rst) |
1da177e4 LT |
850 | return; |
851 | ||
c3658e8d ED |
852 | /* If sk not NULL, it means we did a successful lookup and incoming |
853 | * route had to be correct. prequeue might have dropped our dst. | |
854 | */ | |
855 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 856 | return; |
1da177e4 | 857 | |
cfb6eeb4 | 858 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
859 | hash_location = tcp_parse_md5sig_option(th); |
860 | if (!sk && hash_location) { | |
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; | |
883 | } else { | |
884 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
885 | } | |
cfb6eeb4 YH |
886 | #endif |
887 | ||
626e264d IJ |
888 | if (th->ack) |
889 | seq = ntohl(th->ack_seq); | |
890 | else | |
891 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
892 | (th->doff << 2); | |
1da177e4 | 893 | |
9c76a114 | 894 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 895 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
896 | |
897 | #ifdef CONFIG_TCP_MD5SIG | |
898 | release_sk1: | |
899 | if (sk1) { | |
900 | rcu_read_unlock(); | |
901 | sock_put(sk1); | |
902 | } | |
903 | #endif | |
626e264d | 904 | } |
1da177e4 | 905 | |
0f85feae ED |
906 | static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq, |
907 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, | |
1d13a96c FF |
908 | struct tcp_md5sig_key *key, u8 tclass, |
909 | u32 label) | |
626e264d | 910 | { |
0f85feae ED |
911 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
912 | tclass, label); | |
1da177e4 LT |
913 | } |
914 | ||
915 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
916 | { | |
8feaf0c0 | 917 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 918 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 919 | |
0f85feae | 920 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 921 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 922 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 923 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 924 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 925 | |
8feaf0c0 | 926 | inet_twsk_put(tw); |
1da177e4 LT |
927 | } |
928 | ||
6edafaaf GJ |
929 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
930 | struct request_sock *req) | |
1da177e4 | 931 | { |
3a19ce0e DL |
932 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
933 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
934 | */ | |
0f85feae | 935 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 936 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
0f85feae ED |
937 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
938 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, | |
1d13a96c FF |
939 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
940 | 0, 0); | |
1da177e4 LT |
941 | } |
942 | ||
943 | ||
4c99aa40 | 944 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 945 | { |
aa8223c7 | 946 | const struct tcphdr *th = tcp_hdr(skb); |
52452c54 | 947 | struct request_sock *req; |
1da177e4 LT |
948 | struct sock *nsk; |
949 | ||
950 | /* Find possible connection requests. */ | |
52452c54 | 951 | req = inet6_csk_search_req(sk, th->source, |
0660e03f | 952 | &ipv6_hdr(skb)->saddr, |
870c3151 | 953 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
fa76ce73 ED |
954 | if (req) { |
955 | nsk = tcp_check_req(sk, skb, req, false); | |
956 | reqsk_put(req); | |
957 | return nsk; | |
958 | } | |
3b1e0a65 | 959 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
870c3151 ED |
960 | &ipv6_hdr(skb)->saddr, th->source, |
961 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
962 | tcp_v6_iif(skb)); | |
1da177e4 LT |
963 | |
964 | if (nsk) { | |
965 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
966 | bh_lock_sock(nsk); | |
967 | return nsk; | |
968 | } | |
9469c7b4 | 969 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
970 | return NULL; |
971 | } | |
972 | ||
c6aefafb | 973 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 974 | if (!th->syn) |
c6aefafb | 975 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
976 | #endif |
977 | return sk; | |
978 | } | |
979 | ||
1da177e4 LT |
980 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
981 | { | |
1da177e4 LT |
982 | if (skb->protocol == htons(ETH_P_IP)) |
983 | return tcp_v4_conn_request(sk, skb); | |
984 | ||
985 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 986 | goto drop; |
1da177e4 | 987 | |
1fb6f159 OP |
988 | return tcp_conn_request(&tcp6_request_sock_ops, |
989 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
990 | |
991 | drop: | |
5f1e942c | 992 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
993 | return 0; /* don't send reset */ |
994 | } | |
995 | ||
4c99aa40 WC |
996 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
997 | struct request_sock *req, | |
998 | struct dst_entry *dst) | |
1da177e4 | 999 | { |
634fb979 | 1000 | struct inet_request_sock *ireq; |
1da177e4 LT |
1001 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1002 | struct tcp6_sock *newtcp6sk; | |
1003 | struct inet_sock *newinet; | |
1004 | struct tcp_sock *newtp; | |
1005 | struct sock *newsk; | |
cfb6eeb4 YH |
1006 | #ifdef CONFIG_TCP_MD5SIG |
1007 | struct tcp_md5sig_key *key; | |
1008 | #endif | |
3840a06e | 1009 | struct flowi6 fl6; |
1da177e4 LT |
1010 | |
1011 | if (skb->protocol == htons(ETH_P_IP)) { | |
1012 | /* | |
1013 | * v6 mapped | |
1014 | */ | |
1015 | ||
1016 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1017 | ||
1ab1457c | 1018 | if (newsk == NULL) |
1da177e4 LT |
1019 | return NULL; |
1020 | ||
1021 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1022 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1023 | ||
1024 | newinet = inet_sk(newsk); | |
1025 | newnp = inet6_sk(newsk); | |
1026 | newtp = tcp_sk(newsk); | |
1027 | ||
1028 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1029 | ||
d1e559d0 | 1030 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1031 | |
8292a17a | 1032 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1033 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1034 | #ifdef CONFIG_TCP_MD5SIG |
1035 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1036 | #endif | |
1037 | ||
676a1184 YZ |
1038 | newnp->ipv6_ac_list = NULL; |
1039 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1040 | newnp->pktoptions = NULL; |
1041 | newnp->opt = NULL; | |
870c3151 | 1042 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1043 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1044 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1045 | if (np->repflow) |
1046 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1047 | |
e6848976 ACM |
1048 | /* |
1049 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1050 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1051 | * that function for the gory details. -acme | |
1da177e4 | 1052 | */ |
1da177e4 LT |
1053 | |
1054 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1055 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1056 | Sync it now. |
1057 | */ | |
d83d8461 | 1058 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1059 | |
1060 | return newsk; | |
1061 | } | |
1062 | ||
634fb979 | 1063 | ireq = inet_rsk(req); |
1da177e4 LT |
1064 | |
1065 | if (sk_acceptq_is_full(sk)) | |
1066 | goto out_overflow; | |
1067 | ||
493f377d | 1068 | if (!dst) { |
3840a06e | 1069 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1070 | if (!dst) |
1da177e4 | 1071 | goto out; |
1ab1457c | 1072 | } |
1da177e4 LT |
1073 | |
1074 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1075 | if (newsk == NULL) | |
093d2823 | 1076 | goto out_nonewsk; |
1da177e4 | 1077 | |
e6848976 ACM |
1078 | /* |
1079 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1080 | * count here, tcp_create_openreq_child now does this for us, see the | |
1081 | * comment in that function for the gory details. -acme | |
1082 | */ | |
1da177e4 | 1083 | |
59eed279 | 1084 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1085 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1086 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1087 | |
1088 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1089 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1090 | ||
1091 | newtp = tcp_sk(newsk); | |
1092 | newinet = inet_sk(newsk); | |
1093 | newnp = inet6_sk(newsk); | |
1094 | ||
1095 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1096 | ||
634fb979 ED |
1097 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1098 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1099 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1100 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1101 | |
b73c3d0e TH |
1102 | ip6_set_txhash(newsk); |
1103 | ||
1ab1457c | 1104 | /* Now IPv6 options... |
1da177e4 LT |
1105 | |
1106 | First: no IPv4 options. | |
1107 | */ | |
f6d8bd05 | 1108 | newinet->inet_opt = NULL; |
676a1184 | 1109 | newnp->ipv6_ac_list = NULL; |
d35690be | 1110 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1111 | |
1112 | /* Clone RX bits */ | |
1113 | newnp->rxopt.all = np->rxopt.all; | |
1114 | ||
1115 | /* Clone pktoptions received with SYN */ | |
1116 | newnp->pktoptions = NULL; | |
634fb979 ED |
1117 | if (ireq->pktopts != NULL) { |
1118 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1119 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1120 | consume_skb(ireq->pktopts); |
1121 | ireq->pktopts = NULL; | |
1da177e4 LT |
1122 | if (newnp->pktoptions) |
1123 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1124 | } | |
1125 | newnp->opt = NULL; | |
870c3151 | 1126 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1127 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1128 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1129 | if (np->repflow) |
1130 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1131 | |
1132 | /* Clone native IPv6 options from listening socket (if any) | |
1133 | ||
1134 | Yes, keeping reference count would be much more clever, | |
1135 | but we make one more one thing there: reattach optmem | |
1136 | to newsk. | |
1137 | */ | |
43264e0b RL |
1138 | if (np->opt) |
1139 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1140 | |
d83d8461 | 1141 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1142 | if (newnp->opt) |
d83d8461 ACM |
1143 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1144 | newnp->opt->opt_flen); | |
1da177e4 | 1145 | |
81164413 DB |
1146 | tcp_ca_openreq_child(newsk, dst); |
1147 | ||
1da177e4 | 1148 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1149 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1150 | if (tcp_sk(sk)->rx_opt.user_mss && |
1151 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1152 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1153 | ||
1da177e4 LT |
1154 | tcp_initialize_rcv_mss(newsk); |
1155 | ||
c720c7e8 ED |
1156 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1157 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1158 | |
cfb6eeb4 YH |
1159 | #ifdef CONFIG_TCP_MD5SIG |
1160 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1161 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1162 | if (key != NULL) { | |
cfb6eeb4 YH |
1163 | /* We're using one, so create a matching key |
1164 | * on the newsk structure. If we fail to get | |
1165 | * memory, then we end up not copying the key | |
1166 | * across. Shucks. | |
1167 | */ | |
efe4208f | 1168 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1169 | AF_INET6, key->key, key->keylen, |
1170 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1171 | } |
1172 | #endif | |
1173 | ||
093d2823 | 1174 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1175 | inet_csk_prepare_forced_close(newsk); |
1176 | tcp_done(newsk); | |
093d2823 BS |
1177 | goto out; |
1178 | } | |
77a6a471 | 1179 | __inet_hash(newsk, NULL); |
1da177e4 LT |
1180 | |
1181 | return newsk; | |
1182 | ||
1183 | out_overflow: | |
de0744af | 1184 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1185 | out_nonewsk: |
1da177e4 | 1186 | dst_release(dst); |
093d2823 BS |
1187 | out: |
1188 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1189 | return NULL; |
1190 | } | |
1191 | ||
1da177e4 LT |
1192 | /* The socket must have it's spinlock held when we get |
1193 | * here. | |
1194 | * | |
1195 | * We have a potential double-lock case here, so even when | |
1196 | * doing backlog processing we use the BH locking scheme. | |
1197 | * This is because we cannot sleep with the original spinlock | |
1198 | * held. | |
1199 | */ | |
1200 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1201 | { | |
1202 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1203 | struct tcp_sock *tp; | |
1204 | struct sk_buff *opt_skb = NULL; | |
1205 | ||
1206 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1207 | goes to IPv4 receive handler and backlogged. | |
1208 | From backlog it always goes here. Kerboom... | |
1209 | Fortunately, tcp_rcv_established and rcv_established | |
1210 | handle them correctly, but it is not case with | |
1211 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1212 | */ | |
1213 | ||
1214 | if (skb->protocol == htons(ETH_P_IP)) | |
1215 | return tcp_v4_do_rcv(sk, skb); | |
1216 | ||
fda9ef5d | 1217 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1218 | goto discard; |
1219 | ||
1220 | /* | |
1221 | * socket locking is here for SMP purposes as backlog rcv | |
1222 | * is currently called with bh processing disabled. | |
1223 | */ | |
1224 | ||
1225 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1226 | ||
1227 | Yes, guys, it is the only place in our code, where we | |
1228 | may make it not affecting IPv4. | |
1229 | The rest of code is protocol independent, | |
1230 | and I do not like idea to uglify IPv4. | |
1231 | ||
1232 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1233 | looks not very well thought. For now we latch | |
1234 | options, received in the last packet, enqueued | |
1235 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1236 | --ANK (980728) |
1da177e4 LT |
1237 | */ |
1238 | if (np->rxopt.all) | |
99a1dec7 | 1239 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1240 | |
1241 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1242 | struct dst_entry *dst = sk->sk_rx_dst; |
1243 | ||
bdeab991 | 1244 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1245 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1246 | if (dst) { |
1247 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1248 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1249 | dst_release(dst); | |
1250 | sk->sk_rx_dst = NULL; | |
1251 | } | |
1252 | } | |
1253 | ||
c995ae22 | 1254 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1255 | if (opt_skb) |
1256 | goto ipv6_pktoptions; | |
1257 | return 0; | |
1258 | } | |
1259 | ||
ab6a5bb6 | 1260 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1261 | goto csum_err; |
1262 | ||
1ab1457c | 1263 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1264 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1265 | if (!nsk) | |
1266 | goto discard; | |
1267 | ||
1268 | /* | |
1269 | * Queue it on the new socket if the new socket is active, | |
1270 | * otherwise we just shortcircuit this and continue with | |
1271 | * the new socket.. | |
1272 | */ | |
4c99aa40 | 1273 | if (nsk != sk) { |
bdeab991 | 1274 | sock_rps_save_rxhash(nsk, skb); |
3d97379a | 1275 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1276 | if (tcp_child_process(sk, nsk, skb)) |
1277 | goto reset; | |
1278 | if (opt_skb) | |
1279 | __kfree_skb(opt_skb); | |
1280 | return 0; | |
1281 | } | |
47482f13 | 1282 | } else |
bdeab991 | 1283 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1284 | |
aa8223c7 | 1285 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1286 | goto reset; |
1da177e4 LT |
1287 | if (opt_skb) |
1288 | goto ipv6_pktoptions; | |
1289 | return 0; | |
1290 | ||
1291 | reset: | |
cfb6eeb4 | 1292 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1293 | discard: |
1294 | if (opt_skb) | |
1295 | __kfree_skb(opt_skb); | |
1296 | kfree_skb(skb); | |
1297 | return 0; | |
1298 | csum_err: | |
6a5dc9e5 | 1299 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1300 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1301 | goto discard; |
1302 | ||
1303 | ||
1304 | ipv6_pktoptions: | |
1305 | /* Do you ask, what is it? | |
1306 | ||
1307 | 1. skb was enqueued by tcp. | |
1308 | 2. skb is added to tail of read queue, rather than out of order. | |
1309 | 3. socket is not in passive state. | |
1310 | 4. Finally, it really contains options, which user wants to receive. | |
1311 | */ | |
1312 | tp = tcp_sk(sk); | |
1313 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1314 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1315 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1316 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1317 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1318 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1319 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1320 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1321 | if (np->repflow) |
1322 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1323 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1324 | skb_set_owner_r(opt_skb, sk); |
1325 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1326 | } else { | |
1327 | __kfree_skb(opt_skb); | |
1328 | opt_skb = xchg(&np->pktoptions, NULL); | |
1329 | } | |
1330 | } | |
1331 | ||
800d55f1 | 1332 | kfree_skb(opt_skb); |
1da177e4 LT |
1333 | return 0; |
1334 | } | |
1335 | ||
2dc49d16 ND |
1336 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1337 | const struct tcphdr *th) | |
1338 | { | |
1339 | /* This is tricky: we move IP6CB at its correct location into | |
1340 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1341 | * _decode_session6() uses IP6CB(). | |
1342 | * barrier() makes sure compiler won't play aliasing games. | |
1343 | */ | |
1344 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1345 | sizeof(struct inet6_skb_parm)); | |
1346 | barrier(); | |
1347 | ||
1348 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1349 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1350 | skb->len - th->doff*4); | |
1351 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1352 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1353 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1354 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1355 | TCP_SKB_CB(skb)->sacked = 0; | |
1356 | } | |
1357 | ||
e5bbef20 | 1358 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1359 | { |
cf533ea5 | 1360 | const struct tcphdr *th; |
b71d1d42 | 1361 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1362 | struct sock *sk; |
1363 | int ret; | |
a86b1e30 | 1364 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1365 | |
1366 | if (skb->pkt_type != PACKET_HOST) | |
1367 | goto discard_it; | |
1368 | ||
1369 | /* | |
1370 | * Count it even if it's bad. | |
1371 | */ | |
63231bdd | 1372 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1373 | |
1374 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1375 | goto discard_it; | |
1376 | ||
aa8223c7 | 1377 | th = tcp_hdr(skb); |
1da177e4 LT |
1378 | |
1379 | if (th->doff < sizeof(struct tcphdr)/4) | |
1380 | goto bad_packet; | |
1381 | if (!pskb_may_pull(skb, th->doff*4)) | |
1382 | goto discard_it; | |
1383 | ||
e4f45b7f | 1384 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1385 | goto csum_error; |
1da177e4 | 1386 | |
aa8223c7 | 1387 | th = tcp_hdr(skb); |
e802af9c | 1388 | hdr = ipv6_hdr(skb); |
1da177e4 | 1389 | |
870c3151 | 1390 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1391 | inet6_iif(skb)); |
1da177e4 LT |
1392 | if (!sk) |
1393 | goto no_tcp_socket; | |
1394 | ||
1395 | process: | |
1396 | if (sk->sk_state == TCP_TIME_WAIT) | |
1397 | goto do_time_wait; | |
1398 | ||
e802af9c SH |
1399 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1400 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1401 | goto discard_and_relse; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1405 | goto discard_and_relse; | |
1406 | ||
2dc49d16 ND |
1407 | tcp_v6_fill_cb(skb, hdr, th); |
1408 | ||
9ea88a15 DP |
1409 | #ifdef CONFIG_TCP_MD5SIG |
1410 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1411 | goto discard_and_relse; | |
1412 | #endif | |
1413 | ||
fda9ef5d | 1414 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1415 | goto discard_and_relse; |
1416 | ||
2c8c56e1 | 1417 | sk_incoming_cpu_update(sk); |
1da177e4 LT |
1418 | skb->dev = NULL; |
1419 | ||
293b9c42 | 1420 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1421 | ret = 0; |
1422 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1423 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1424 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1425 | } else if (unlikely(sk_add_backlog(sk, skb, |
1426 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1427 | bh_unlock_sock(sk); |
6cce09f8 | 1428 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1429 | goto discard_and_relse; |
1430 | } | |
1da177e4 LT |
1431 | bh_unlock_sock(sk); |
1432 | ||
1433 | sock_put(sk); | |
1434 | return ret ? -1 : 0; | |
1435 | ||
1436 | no_tcp_socket: | |
1437 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1438 | goto discard_it; | |
1439 | ||
2dc49d16 ND |
1440 | tcp_v6_fill_cb(skb, hdr, th); |
1441 | ||
1da177e4 | 1442 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1443 | csum_error: |
1444 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1445 | bad_packet: |
63231bdd | 1446 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1447 | } else { |
cfb6eeb4 | 1448 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1449 | } |
1450 | ||
1451 | discard_it: | |
1da177e4 LT |
1452 | kfree_skb(skb); |
1453 | return 0; | |
1454 | ||
1455 | discard_and_relse: | |
1456 | sock_put(sk); | |
1457 | goto discard_it; | |
1458 | ||
1459 | do_time_wait: | |
1460 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1461 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1462 | goto discard_it; |
1463 | } | |
1464 | ||
2dc49d16 ND |
1465 | tcp_v6_fill_cb(skb, hdr, th); |
1466 | ||
6a5dc9e5 | 1467 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1468 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1469 | goto bad_packet; |
1470 | } | |
1471 | if (tcp_checksum_complete(skb)) { | |
1472 | inet_twsk_put(inet_twsk(sk)); | |
1473 | goto csum_error; | |
1da177e4 LT |
1474 | } |
1475 | ||
9469c7b4 | 1476 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1477 | case TCP_TW_SYN: |
1478 | { | |
1479 | struct sock *sk2; | |
1480 | ||
c346dca1 | 1481 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1482 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1483 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1484 | ntohs(th->dest), tcp_v6_iif(skb)); |
1da177e4 | 1485 | if (sk2 != NULL) { |
295ff7ed ACM |
1486 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1487 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1488 | inet_twsk_put(tw); | |
1da177e4 LT |
1489 | sk = sk2; |
1490 | goto process; | |
1491 | } | |
1492 | /* Fall through to ACK */ | |
1493 | } | |
1494 | case TCP_TW_ACK: | |
1495 | tcp_v6_timewait_ack(sk, skb); | |
1496 | break; | |
1497 | case TCP_TW_RST: | |
1498 | goto no_tcp_socket; | |
4aa956d8 WY |
1499 | case TCP_TW_SUCCESS: |
1500 | ; | |
1da177e4 LT |
1501 | } |
1502 | goto discard_it; | |
1503 | } | |
1504 | ||
c7109986 ED |
1505 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1506 | { | |
1507 | const struct ipv6hdr *hdr; | |
1508 | const struct tcphdr *th; | |
1509 | struct sock *sk; | |
1510 | ||
1511 | if (skb->pkt_type != PACKET_HOST) | |
1512 | return; | |
1513 | ||
1514 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1515 | return; | |
1516 | ||
1517 | hdr = ipv6_hdr(skb); | |
1518 | th = tcp_hdr(skb); | |
1519 | ||
1520 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1521 | return; | |
1522 | ||
870c3151 | 1523 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1524 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1525 | &hdr->saddr, th->source, | |
1526 | &hdr->daddr, ntohs(th->dest), | |
1527 | inet6_iif(skb)); | |
1528 | if (sk) { | |
1529 | skb->sk = sk; | |
1530 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1531 | if (sk_fullsock(sk)) { |
c7109986 | 1532 | struct dst_entry *dst = sk->sk_rx_dst; |
f3f12135 | 1533 | |
c7109986 | 1534 | if (dst) |
5d299f3d | 1535 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1536 | if (dst && |
f3f12135 | 1537 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1538 | skb_dst_set_noref(skb, dst); |
1539 | } | |
1540 | } | |
1541 | } | |
1542 | ||
ccb7c410 DM |
1543 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1544 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1545 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1546 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1547 | }; |
1548 | ||
3b401a81 | 1549 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1550 | .queue_xmit = inet6_csk_xmit, |
1551 | .send_check = tcp_v6_send_check, | |
1552 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1553 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1554 | .conn_request = tcp_v6_conn_request, |
1555 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1556 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1557 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1558 | .setsockopt = ipv6_setsockopt, |
1559 | .getsockopt = ipv6_getsockopt, | |
1560 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1561 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1562 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1563 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1564 | .compat_setsockopt = compat_ipv6_setsockopt, |
1565 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1566 | #endif |
4fab9071 | 1567 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1568 | }; |
1569 | ||
cfb6eeb4 | 1570 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1571 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1572 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1573 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1574 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1575 | }; |
a928630a | 1576 | #endif |
cfb6eeb4 | 1577 | |
1da177e4 LT |
1578 | /* |
1579 | * TCP over IPv4 via INET6 API | |
1580 | */ | |
3b401a81 | 1581 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1582 | .queue_xmit = ip_queue_xmit, |
1583 | .send_check = tcp_v4_send_check, | |
1584 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1585 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1586 | .conn_request = tcp_v6_conn_request, |
1587 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1588 | .net_header_len = sizeof(struct iphdr), |
1589 | .setsockopt = ipv6_setsockopt, | |
1590 | .getsockopt = ipv6_getsockopt, | |
1591 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1592 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1593 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1594 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1595 | .compat_setsockopt = compat_ipv6_setsockopt, |
1596 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1597 | #endif |
4fab9071 | 1598 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1599 | }; |
1600 | ||
cfb6eeb4 | 1601 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1602 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1603 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1604 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1605 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1606 | }; |
a928630a | 1607 | #endif |
cfb6eeb4 | 1608 | |
1da177e4 LT |
1609 | /* NOTE: A lot of things set to zero explicitly by call to |
1610 | * sk_alloc() so need not be done here. | |
1611 | */ | |
1612 | static int tcp_v6_init_sock(struct sock *sk) | |
1613 | { | |
6687e988 | 1614 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1615 | |
900f65d3 | 1616 | tcp_init_sock(sk); |
1da177e4 | 1617 | |
8292a17a | 1618 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1619 | |
cfb6eeb4 | 1620 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1621 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1622 | #endif |
1623 | ||
1da177e4 LT |
1624 | return 0; |
1625 | } | |
1626 | ||
7d06b2e0 | 1627 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1628 | { |
1da177e4 | 1629 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1630 | inet6_destroy_sock(sk); |
1da177e4 LT |
1631 | } |
1632 | ||
952a10be | 1633 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1634 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1635 | static void get_openreq6(struct seq_file *seq, |
d4f06873 | 1636 | struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1637 | { |
fa76ce73 | 1638 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1639 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1640 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1641 | |
1642 | if (ttd < 0) | |
1643 | ttd = 0; | |
1644 | ||
1da177e4 LT |
1645 | seq_printf(seq, |
1646 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1647 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1648 | i, |
1649 | src->s6_addr32[0], src->s6_addr32[1], | |
1650 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1651 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1652 | dest->s6_addr32[0], dest->s6_addr32[1], |
1653 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1654 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1655 | TCP_SYN_RECV, |
4c99aa40 | 1656 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1657 | 1, /* timers active (only the expire timer) */ |
1658 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1659 | req->num_timeout, |
a7cb5a49 | 1660 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1661 | 0, /* non standard timer */ |
1da177e4 LT |
1662 | 0, /* open_requests have no inode */ |
1663 | 0, req); | |
1664 | } | |
1665 | ||
1666 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1667 | { | |
b71d1d42 | 1668 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1669 | __u16 destp, srcp; |
1670 | int timer_active; | |
1671 | unsigned long timer_expires; | |
cf533ea5 ED |
1672 | const struct inet_sock *inet = inet_sk(sp); |
1673 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1674 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1675 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1676 | |
efe4208f ED |
1677 | dest = &sp->sk_v6_daddr; |
1678 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1679 | destp = ntohs(inet->inet_dport); |
1680 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1681 | |
1682 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1683 | timer_active = 1; |
463c84b9 ACM |
1684 | timer_expires = icsk->icsk_timeout; |
1685 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1686 | timer_active = 4; |
463c84b9 | 1687 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1688 | } else if (timer_pending(&sp->sk_timer)) { |
1689 | timer_active = 2; | |
1690 | timer_expires = sp->sk_timer.expires; | |
1691 | } else { | |
1692 | timer_active = 0; | |
1693 | timer_expires = jiffies; | |
1694 | } | |
1695 | ||
1696 | seq_printf(seq, | |
1697 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1698 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1699 | i, |
1700 | src->s6_addr32[0], src->s6_addr32[1], | |
1701 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1702 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1703 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1704 | sp->sk_state, |
47da8ee6 SS |
1705 | tp->write_seq-tp->snd_una, |
1706 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1707 | timer_active, |
a399a805 | 1708 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1709 | icsk->icsk_retransmits, |
a7cb5a49 | 1710 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1711 | icsk->icsk_probes_out, |
1da177e4 LT |
1712 | sock_i_ino(sp), |
1713 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1714 | jiffies_to_clock_t(icsk->icsk_rto), |
1715 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1716 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1717 | tp->snd_cwnd, |
0a672f74 YC |
1718 | sp->sk_state == TCP_LISTEN ? |
1719 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1720 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1721 | ); |
1722 | } | |
1723 | ||
1ab1457c | 1724 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1725 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1726 | { |
b71d1d42 | 1727 | const struct in6_addr *dest, *src; |
1da177e4 | 1728 | __u16 destp, srcp; |
96f817fe | 1729 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1730 | |
efe4208f ED |
1731 | dest = &tw->tw_v6_daddr; |
1732 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1733 | destp = ntohs(tw->tw_dport); |
1734 | srcp = ntohs(tw->tw_sport); | |
1735 | ||
1736 | seq_printf(seq, | |
1737 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1738 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1739 | i, |
1740 | src->s6_addr32[0], src->s6_addr32[1], | |
1741 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1742 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1743 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1744 | tw->tw_substate, 0, 0, | |
a399a805 | 1745 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1746 | atomic_read(&tw->tw_refcnt), tw); |
1747 | } | |
1748 | ||
1da177e4 LT |
1749 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1750 | { | |
1751 | struct tcp_iter_state *st; | |
05dbc7b5 | 1752 | struct sock *sk = v; |
1da177e4 LT |
1753 | |
1754 | if (v == SEQ_START_TOKEN) { | |
1755 | seq_puts(seq, | |
1756 | " sl " | |
1757 | "local_address " | |
1758 | "remote_address " | |
1759 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1760 | " uid timeout inode\n"); | |
1761 | goto out; | |
1762 | } | |
1763 | st = seq->private; | |
1764 | ||
1765 | switch (st->state) { | |
1766 | case TCP_SEQ_STATE_LISTENING: | |
1767 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1768 | if (sk->sk_state == TCP_TIME_WAIT) |
1769 | get_timewait6_sock(seq, v, st->num); | |
1770 | else | |
1771 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1772 | break; |
1773 | case TCP_SEQ_STATE_OPENREQ: | |
d4f06873 | 1774 | get_openreq6(seq, v, st->num, st->uid); |
1da177e4 | 1775 | break; |
1da177e4 LT |
1776 | } |
1777 | out: | |
1778 | return 0; | |
1779 | } | |
1780 | ||
73cb88ec AV |
1781 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1782 | .owner = THIS_MODULE, | |
1783 | .open = tcp_seq_open, | |
1784 | .read = seq_read, | |
1785 | .llseek = seq_lseek, | |
1786 | .release = seq_release_net | |
1787 | }; | |
1788 | ||
1da177e4 | 1789 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1790 | .name = "tcp6", |
1791 | .family = AF_INET6, | |
73cb88ec | 1792 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1793 | .seq_ops = { |
1794 | .show = tcp6_seq_show, | |
1795 | }, | |
1da177e4 LT |
1796 | }; |
1797 | ||
2c8c1e72 | 1798 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1799 | { |
6f8b13bc | 1800 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1801 | } |
1802 | ||
6f8b13bc | 1803 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1804 | { |
6f8b13bc | 1805 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1806 | } |
1807 | #endif | |
1808 | ||
f77d6021 ED |
1809 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1810 | { | |
1811 | struct inet_sock *inet = inet_sk(sk); | |
1812 | ||
1813 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1814 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1815 | ||
1816 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1817 | memset(&inet->pinet6 + 1, 0, size); | |
1818 | } | |
1819 | ||
1da177e4 LT |
1820 | struct proto tcpv6_prot = { |
1821 | .name = "TCPv6", | |
1822 | .owner = THIS_MODULE, | |
1823 | .close = tcp_close, | |
1824 | .connect = tcp_v6_connect, | |
1825 | .disconnect = tcp_disconnect, | |
463c84b9 | 1826 | .accept = inet_csk_accept, |
1da177e4 LT |
1827 | .ioctl = tcp_ioctl, |
1828 | .init = tcp_v6_init_sock, | |
1829 | .destroy = tcp_v6_destroy_sock, | |
1830 | .shutdown = tcp_shutdown, | |
1831 | .setsockopt = tcp_setsockopt, | |
1832 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1833 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1834 | .sendmsg = tcp_sendmsg, |
1835 | .sendpage = tcp_sendpage, | |
1da177e4 | 1836 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1837 | .release_cb = tcp_release_cb, |
77a6a471 | 1838 | .hash = inet_hash, |
ab1e0a13 ACM |
1839 | .unhash = inet_unhash, |
1840 | .get_port = inet_csk_get_port, | |
1da177e4 | 1841 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1842 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1843 | .sockets_allocated = &tcp_sockets_allocated, |
1844 | .memory_allocated = &tcp_memory_allocated, | |
1845 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1846 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1847 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1848 | .sysctl_wmem = sysctl_tcp_wmem, |
1849 | .sysctl_rmem = sysctl_tcp_rmem, | |
1850 | .max_header = MAX_TCP_HEADER, | |
1851 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1852 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1853 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1854 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1855 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1856 | .no_autobind = true, |
543d9cfe ACM |
1857 | #ifdef CONFIG_COMPAT |
1858 | .compat_setsockopt = compat_tcp_setsockopt, | |
1859 | .compat_getsockopt = compat_tcp_getsockopt, | |
1860 | #endif | |
c255a458 | 1861 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1862 | .proto_cgroup = tcp_proto_cgroup, |
1863 | #endif | |
f77d6021 | 1864 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1865 | }; |
1866 | ||
41135cc8 | 1867 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1868 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1869 | .handler = tcp_v6_rcv, |
1870 | .err_handler = tcp_v6_err, | |
1871 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1872 | }; | |
1873 | ||
1da177e4 LT |
1874 | static struct inet_protosw tcpv6_protosw = { |
1875 | .type = SOCK_STREAM, | |
1876 | .protocol = IPPROTO_TCP, | |
1877 | .prot = &tcpv6_prot, | |
1878 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1879 | .flags = INET_PROTOSW_PERMANENT | |
1880 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1881 | }; |
1882 | ||
2c8c1e72 | 1883 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1884 | { |
5677242f DL |
1885 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1886 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1887 | } |
1888 | ||
2c8c1e72 | 1889 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1890 | { |
5677242f | 1891 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1892 | } |
1893 | ||
2c8c1e72 | 1894 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1895 | { |
1896 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1897 | } |
1898 | ||
1899 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1900 | .init = tcpv6_net_init, |
1901 | .exit = tcpv6_net_exit, | |
1902 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1903 | }; |
1904 | ||
7f4e4868 | 1905 | int __init tcpv6_init(void) |
1da177e4 | 1906 | { |
7f4e4868 DL |
1907 | int ret; |
1908 | ||
3336288a VY |
1909 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1910 | if (ret) | |
c6b641a4 | 1911 | goto out; |
3336288a | 1912 | |
1da177e4 | 1913 | /* register inet6 protocol */ |
7f4e4868 DL |
1914 | ret = inet6_register_protosw(&tcpv6_protosw); |
1915 | if (ret) | |
1916 | goto out_tcpv6_protocol; | |
1917 | ||
93ec926b | 1918 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1919 | if (ret) |
1920 | goto out_tcpv6_protosw; | |
1921 | out: | |
1922 | return ret; | |
ae0f7d5f | 1923 | |
7f4e4868 DL |
1924 | out_tcpv6_protosw: |
1925 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1926 | out_tcpv6_protocol: |
1927 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1928 | goto out; |
1929 | } | |
1930 | ||
09f7709f | 1931 | void tcpv6_exit(void) |
7f4e4868 | 1932 | { |
93ec926b | 1933 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1934 | inet6_unregister_protosw(&tcpv6_protosw); |
1935 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1936 | } |