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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 | ||
cf80e0e4 | 69 | #include <crypto/hash.h> |
cfb6eeb4 YH |
70 | #include <linux/scatterlist.h> |
71 | ||
c24b14c4 SL |
72 | #include <trace/events/tcp.h> |
73 | ||
a00e7444 ED |
74 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb); |
75 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
6edafaaf | 76 | struct request_sock *req); |
1da177e4 LT |
77 | |
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 79 | |
3b401a81 SH |
80 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 82 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 | 85 | #else |
51723935 | 86 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 87 | const struct in6_addr *addr) |
9501f972 YH |
88 | { |
89 | return NULL; | |
90 | } | |
a928630a | 91 | #endif |
1da177e4 | 92 | |
fae6ef87 NC |
93 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
94 | { | |
95 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 96 | |
5037e9ef | 97 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
98 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
99 | ||
ca777eff ED |
100 | sk->sk_rx_dst = dst; |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
b197df4f | 102 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 103 | } |
fae6ef87 NC |
104 | } |
105 | ||
84b114b9 | 106 | static u32 tcp_v6_init_seq(const struct sk_buff *skb) |
1da177e4 | 107 | { |
84b114b9 ED |
108 | return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32, |
109 | ipv6_hdr(skb)->saddr.s6_addr32, | |
110 | tcp_hdr(skb)->dest, | |
111 | tcp_hdr(skb)->source); | |
112 | } | |
113 | ||
5d2ed052 | 114 | static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb) |
84b114b9 | 115 | { |
5d2ed052 | 116 | return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32, |
84b114b9 | 117 | ipv6_hdr(skb)->saddr.s6_addr32); |
1da177e4 LT |
118 | } |
119 | ||
1ab1457c | 120 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
121 | int addr_len) |
122 | { | |
123 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 124 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 125 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
126 | struct ipv6_pinfo *np = inet6_sk(sk); |
127 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 128 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 129 | struct ipv6_txoptions *opt; |
4c9483b2 | 130 | struct flowi6 fl6; |
1da177e4 LT |
131 | struct dst_entry *dst; |
132 | int addr_type; | |
133 | int err; | |
1946e672 | 134 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
1da177e4 | 135 | |
1ab1457c | 136 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
137 | return -EINVAL; |
138 | ||
1ab1457c | 139 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 140 | return -EAFNOSUPPORT; |
1da177e4 | 141 | |
4c9483b2 | 142 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
143 | |
144 | if (np->sndflow) { | |
4c9483b2 DM |
145 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
146 | IP6_ECN_flow_init(fl6.flowlabel); | |
147 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 148 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 149 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 150 | if (!flowlabel) |
1da177e4 | 151 | return -EINVAL; |
1da177e4 LT |
152 | fl6_sock_release(flowlabel); |
153 | } | |
154 | } | |
155 | ||
156 | /* | |
1ab1457c YH |
157 | * connect() to INADDR_ANY means loopback (BSD'ism). |
158 | */ | |
159 | ||
052d2369 JL |
160 | if (ipv6_addr_any(&usin->sin6_addr)) { |
161 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
162 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
163 | &usin->sin6_addr); | |
164 | else | |
165 | usin->sin6_addr = in6addr_loopback; | |
166 | } | |
1da177e4 LT |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
169 | ||
4c99aa40 | 170 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
171 | return -ENETUNREACH; |
172 | ||
173 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
174 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
175 | usin->sin6_scope_id) { | |
176 | /* If interface is set while binding, indices | |
177 | * must coincide. | |
178 | */ | |
179 | if (sk->sk_bound_dev_if && | |
180 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
181 | return -EINVAL; | |
182 | ||
183 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
184 | } | |
185 | ||
186 | /* Connect to link-local address requires an interface */ | |
187 | if (!sk->sk_bound_dev_if) | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 192 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
193 | tp->rx_opt.ts_recent = 0; |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
efe4208f | 198 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 199 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
200 | |
201 | /* | |
202 | * TCP over IPv4 | |
203 | */ | |
204 | ||
052d2369 | 205 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 206 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
207 | struct sockaddr_in sin; |
208 | ||
209 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
210 | ||
211 | if (__ipv6_only_sock(sk)) | |
212 | return -ENETUNREACH; | |
213 | ||
214 | sin.sin_family = AF_INET; | |
215 | sin.sin_port = usin->sin6_port; | |
216 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
217 | ||
d83d8461 | 218 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 219 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
220 | #ifdef CONFIG_TCP_MD5SIG |
221 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
222 | #endif | |
1da177e4 LT |
223 | |
224 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
225 | ||
226 | if (err) { | |
d83d8461 ACM |
227 | icsk->icsk_ext_hdr_len = exthdrlen; |
228 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 229 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
230 | #ifdef CONFIG_TCP_MD5SIG |
231 | tp->af_specific = &tcp_sock_ipv6_specific; | |
232 | #endif | |
1da177e4 | 233 | goto failure; |
1da177e4 | 234 | } |
d1e559d0 | 235 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
236 | |
237 | return err; | |
238 | } | |
239 | ||
efe4208f ED |
240 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
241 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 242 | |
4c9483b2 | 243 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 244 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 245 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
246 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
247 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
248 | fl6.fl6_dport = usin->sin6_port; |
249 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 250 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 251 | |
1e1d04e6 | 252 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 253 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 254 | |
4c9483b2 | 255 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 256 | |
0e0d44ab | 257 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
258 | if (IS_ERR(dst)) { |
259 | err = PTR_ERR(dst); | |
1da177e4 | 260 | goto failure; |
14e50e57 | 261 | } |
1da177e4 | 262 | |
63159f29 | 263 | if (!saddr) { |
4c9483b2 | 264 | saddr = &fl6.saddr; |
efe4208f | 265 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
266 | } |
267 | ||
268 | /* set the source address */ | |
4e3fd7a0 | 269 | np->saddr = *saddr; |
c720c7e8 | 270 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 271 | |
f83ef8c0 | 272 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 273 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 274 | |
d83d8461 | 275 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
276 | if (opt) |
277 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
278 | opt->opt_nflen; | |
1da177e4 LT |
279 | |
280 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
281 | ||
c720c7e8 | 282 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
283 | |
284 | tcp_set_state(sk, TCP_SYN_SENT); | |
1946e672 | 285 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
286 | if (err) |
287 | goto late_failure; | |
288 | ||
877d1f62 | 289 | sk_set_txhash(sk); |
9e7ceb06 | 290 | |
00355fa5 | 291 | if (likely(!tp->repair)) { |
00355fa5 | 292 | if (!tp->write_seq) |
84b114b9 ED |
293 | tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32, |
294 | sk->sk_v6_daddr.s6_addr32, | |
295 | inet->inet_sport, | |
296 | inet->inet_dport); | |
5d2ed052 ED |
297 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
298 | np->saddr.s6_addr32, | |
84b114b9 | 299 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 300 | } |
1da177e4 | 301 | |
19f6d3f3 WW |
302 | if (tcp_fastopen_defer_connect(sk, &err)) |
303 | return err; | |
304 | if (err) | |
305 | goto late_failure; | |
306 | ||
1da177e4 LT |
307 | err = tcp_connect(sk); |
308 | if (err) | |
309 | goto late_failure; | |
310 | ||
311 | return 0; | |
312 | ||
313 | late_failure: | |
314 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 315 | failure: |
c720c7e8 | 316 | inet->inet_dport = 0; |
1da177e4 LT |
317 | sk->sk_route_caps = 0; |
318 | return err; | |
319 | } | |
320 | ||
563d34d0 ED |
321 | static void tcp_v6_mtu_reduced(struct sock *sk) |
322 | { | |
323 | struct dst_entry *dst; | |
324 | ||
325 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
326 | return; | |
327 | ||
328 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
329 | if (!dst) | |
330 | return; | |
331 | ||
332 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
333 | tcp_sync_mss(sk, dst_mtu(dst)); | |
334 | tcp_simple_retransmit(sk); | |
335 | } | |
336 | } | |
337 | ||
1da177e4 | 338 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 339 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 340 | { |
4c99aa40 | 341 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 342 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
343 | struct net *net = dev_net(skb->dev); |
344 | struct request_sock *fastopen; | |
1da177e4 | 345 | struct ipv6_pinfo *np; |
1ab1457c | 346 | struct tcp_sock *tp; |
0a672f74 | 347 | __u32 seq, snd_una; |
2215089b | 348 | struct sock *sk; |
9cf74903 | 349 | bool fatal; |
2215089b | 350 | int err; |
1da177e4 | 351 | |
2215089b ED |
352 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
353 | &hdr->daddr, th->dest, | |
354 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 355 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 356 | |
2215089b | 357 | if (!sk) { |
a16292a0 ED |
358 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
359 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
360 | return; |
361 | } | |
362 | ||
363 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 364 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
365 | return; |
366 | } | |
2215089b | 367 | seq = ntohl(th->seq); |
9cf74903 | 368 | fatal = icmpv6_err_convert(type, code, &err); |
2215089b | 369 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
9cf74903 | 370 | return tcp_req_err(sk, seq, fatal); |
1da177e4 LT |
371 | |
372 | bh_lock_sock(sk); | |
563d34d0 | 373 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 374 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
375 | |
376 | if (sk->sk_state == TCP_CLOSE) | |
377 | goto out; | |
378 | ||
e802af9c | 379 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 380 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
381 | goto out; |
382 | } | |
383 | ||
1da177e4 | 384 | tp = tcp_sk(sk); |
0a672f74 YC |
385 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
386 | fastopen = tp->fastopen_rsk; | |
387 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 388 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 389 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 390 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
391 | goto out; |
392 | } | |
393 | ||
394 | np = inet6_sk(sk); | |
395 | ||
ec18d9a2 | 396 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
397 | if (!sock_owned_by_user(sk)) { |
398 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 399 | |
45caeaa5 JM |
400 | if (dst) |
401 | dst->ops->redirect(dst, sk, skb); | |
402 | } | |
50a75a89 | 403 | goto out; |
ec18d9a2 DM |
404 | } |
405 | ||
1da177e4 | 406 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
407 | /* We are not interested in TCP_LISTEN and open_requests |
408 | * (SYN-ACKs send out by Linux are always <576bytes so | |
409 | * they should go through unfragmented). | |
410 | */ | |
411 | if (sk->sk_state == TCP_LISTEN) | |
412 | goto out; | |
413 | ||
93b36cf3 HFS |
414 | if (!ip6_sk_accept_pmtu(sk)) |
415 | goto out; | |
416 | ||
563d34d0 ED |
417 | tp->mtu_info = ntohl(info); |
418 | if (!sock_owned_by_user(sk)) | |
419 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 420 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 421 | &sk->sk_tsq_flags)) |
d013ef2a | 422 | sock_hold(sk); |
1da177e4 LT |
423 | goto out; |
424 | } | |
425 | ||
1da177e4 | 426 | |
60236fdd | 427 | /* Might be for an request_sock */ |
1da177e4 | 428 | switch (sk->sk_state) { |
1da177e4 | 429 | case TCP_SYN_SENT: |
0a672f74 YC |
430 | case TCP_SYN_RECV: |
431 | /* Only in fast or simultaneous open. If a fast open socket is | |
432 | * is already accepted it is treated as a connected one below. | |
433 | */ | |
63159f29 | 434 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
435 | break; |
436 | ||
1da177e4 | 437 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
438 | sk->sk_err = err; |
439 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
440 | ||
441 | tcp_done(sk); | |
442 | } else | |
443 | sk->sk_err_soft = err; | |
444 | goto out; | |
445 | } | |
446 | ||
447 | if (!sock_owned_by_user(sk) && np->recverr) { | |
448 | sk->sk_err = err; | |
449 | sk->sk_error_report(sk); | |
450 | } else | |
451 | sk->sk_err_soft = err; | |
452 | ||
453 | out: | |
454 | bh_unlock_sock(sk); | |
455 | sock_put(sk); | |
456 | } | |
457 | ||
458 | ||
0f935dbe | 459 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 460 | struct flowi *fl, |
3840a06e | 461 | struct request_sock *req, |
ca6fb065 | 462 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 463 | enum tcp_synack_type synack_type) |
1da177e4 | 464 | { |
634fb979 | 465 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 466 | struct ipv6_pinfo *np = inet6_sk(sk); |
56ac42bc | 467 | struct ipv6_txoptions *opt; |
d6274bd8 | 468 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 469 | struct sk_buff *skb; |
9494218f | 470 | int err = -ENOMEM; |
1da177e4 | 471 | |
9f10d3f6 | 472 | /* First, grab a route. */ |
f76b33c3 ED |
473 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
474 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 475 | goto done; |
9494218f | 476 | |
b3d05147 | 477 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 478 | |
1da177e4 | 479 | if (skb) { |
634fb979 ED |
480 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
481 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 482 | |
634fb979 | 483 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 484 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
485 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
486 | ||
3e4006f0 | 487 | rcu_read_lock(); |
56ac42bc HD |
488 | opt = ireq->ipv6_opt; |
489 | if (!opt) | |
490 | opt = rcu_dereference(np->opt); | |
92e55f41 | 491 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass); |
3e4006f0 | 492 | rcu_read_unlock(); |
b9df3cb8 | 493 | err = net_xmit_eval(err); |
1da177e4 LT |
494 | } |
495 | ||
496 | done: | |
1da177e4 LT |
497 | return err; |
498 | } | |
499 | ||
72659ecc | 500 | |
60236fdd | 501 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 502 | { |
56ac42bc | 503 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 504 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
505 | } |
506 | ||
cfb6eeb4 | 507 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 508 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 509 | const struct in6_addr *addr) |
cfb6eeb4 | 510 | { |
a915da9b | 511 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
512 | } |
513 | ||
b83e3deb | 514 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 515 | const struct sock *addr_sk) |
cfb6eeb4 | 516 | { |
efe4208f | 517 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
518 | } |
519 | ||
8917a777 ID |
520 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
521 | char __user *optval, int optlen) | |
cfb6eeb4 YH |
522 | { |
523 | struct tcp_md5sig cmd; | |
524 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
8917a777 | 525 | u8 prefixlen; |
cfb6eeb4 YH |
526 | |
527 | if (optlen < sizeof(cmd)) | |
528 | return -EINVAL; | |
529 | ||
530 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
531 | return -EFAULT; | |
532 | ||
533 | if (sin6->sin6_family != AF_INET6) | |
534 | return -EINVAL; | |
535 | ||
8917a777 ID |
536 | if (optname == TCP_MD5SIG_EXT && |
537 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
538 | prefixlen = cmd.tcpm_prefixlen; | |
539 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
540 | prefixlen > 32)) | |
541 | return -EINVAL; | |
542 | } else { | |
543 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
544 | } | |
545 | ||
cfb6eeb4 | 546 | if (!cmd.tcpm_keylen) { |
e773e4fa | 547 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 548 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
8917a777 | 549 | AF_INET, prefixlen); |
a915da9b | 550 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 | 551 | AF_INET6, prefixlen); |
cfb6eeb4 YH |
552 | } |
553 | ||
554 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
555 | return -EINVAL; | |
556 | ||
a915da9b ED |
557 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
558 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
8917a777 | 559 | AF_INET, prefixlen, cmd.tcpm_key, |
6797318e | 560 | cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 | 561 | |
a915da9b | 562 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 ID |
563 | AF_INET6, prefixlen, cmd.tcpm_key, |
564 | cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
565 | } |
566 | ||
19689e38 ED |
567 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
568 | const struct in6_addr *daddr, | |
569 | const struct in6_addr *saddr, | |
570 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 571 | { |
cfb6eeb4 | 572 | struct tcp6_pseudohdr *bp; |
49a72dfb | 573 | struct scatterlist sg; |
19689e38 | 574 | struct tcphdr *_th; |
8d26d76d | 575 | |
19689e38 | 576 | bp = hp->scratch; |
cfb6eeb4 | 577 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
578 | bp->saddr = *saddr; |
579 | bp->daddr = *daddr; | |
49a72dfb | 580 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 581 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 582 | |
19689e38 ED |
583 | _th = (struct tcphdr *)(bp + 1); |
584 | memcpy(_th, th, sizeof(*th)); | |
585 | _th->check = 0; | |
586 | ||
587 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
588 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
589 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 590 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 591 | } |
c7da57a1 | 592 | |
19689e38 | 593 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 594 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 595 | const struct tcphdr *th) |
49a72dfb AL |
596 | { |
597 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 598 | struct ahash_request *req; |
49a72dfb AL |
599 | |
600 | hp = tcp_get_md5sig_pool(); | |
601 | if (!hp) | |
602 | goto clear_hash_noput; | |
cf80e0e4 | 603 | req = hp->md5_req; |
49a72dfb | 604 | |
cf80e0e4 | 605 | if (crypto_ahash_init(req)) |
49a72dfb | 606 | goto clear_hash; |
19689e38 | 607 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
608 | goto clear_hash; |
609 | if (tcp_md5_hash_key(hp, key)) | |
610 | goto clear_hash; | |
cf80e0e4 HX |
611 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
612 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 613 | goto clear_hash; |
cfb6eeb4 | 614 | |
cfb6eeb4 | 615 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 616 | return 0; |
49a72dfb | 617 | |
cfb6eeb4 YH |
618 | clear_hash: |
619 | tcp_put_md5sig_pool(); | |
620 | clear_hash_noput: | |
621 | memset(md5_hash, 0, 16); | |
49a72dfb | 622 | return 1; |
cfb6eeb4 YH |
623 | } |
624 | ||
39f8e58e ED |
625 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
626 | const struct tcp_md5sig_key *key, | |
318cf7aa | 627 | const struct sock *sk, |
318cf7aa | 628 | const struct sk_buff *skb) |
cfb6eeb4 | 629 | { |
b71d1d42 | 630 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 631 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 632 | struct ahash_request *req; |
318cf7aa | 633 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 634 | |
39f8e58e ED |
635 | if (sk) { /* valid for establish/request sockets */ |
636 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 637 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 638 | } else { |
b71d1d42 | 639 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
640 | saddr = &ip6h->saddr; |
641 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 642 | } |
49a72dfb AL |
643 | |
644 | hp = tcp_get_md5sig_pool(); | |
645 | if (!hp) | |
646 | goto clear_hash_noput; | |
cf80e0e4 | 647 | req = hp->md5_req; |
49a72dfb | 648 | |
cf80e0e4 | 649 | if (crypto_ahash_init(req)) |
49a72dfb AL |
650 | goto clear_hash; |
651 | ||
19689e38 | 652 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
653 | goto clear_hash; |
654 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
655 | goto clear_hash; | |
656 | if (tcp_md5_hash_key(hp, key)) | |
657 | goto clear_hash; | |
cf80e0e4 HX |
658 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
659 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
660 | goto clear_hash; |
661 | ||
662 | tcp_put_md5sig_pool(); | |
663 | return 0; | |
664 | ||
665 | clear_hash: | |
666 | tcp_put_md5sig_pool(); | |
667 | clear_hash_noput: | |
668 | memset(md5_hash, 0, 16); | |
669 | return 1; | |
cfb6eeb4 YH |
670 | } |
671 | ||
ba8e275a ED |
672 | #endif |
673 | ||
674 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
675 | const struct sk_buff *skb) | |
cfb6eeb4 | 676 | { |
ba8e275a | 677 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 678 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 679 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 680 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 681 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 682 | int genhash; |
cfb6eeb4 YH |
683 | u8 newhash[16]; |
684 | ||
685 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 686 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 687 | |
785957d3 DM |
688 | /* We've parsed the options - do we have a hash? */ |
689 | if (!hash_expected && !hash_location) | |
ff74e23f | 690 | return false; |
785957d3 DM |
691 | |
692 | if (hash_expected && !hash_location) { | |
c10d9310 | 693 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 694 | return true; |
cfb6eeb4 YH |
695 | } |
696 | ||
785957d3 | 697 | if (!hash_expected && hash_location) { |
c10d9310 | 698 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 699 | return true; |
cfb6eeb4 YH |
700 | } |
701 | ||
702 | /* check the signature */ | |
49a72dfb AL |
703 | genhash = tcp_v6_md5_hash_skb(newhash, |
704 | hash_expected, | |
39f8e58e | 705 | NULL, skb); |
49a72dfb | 706 | |
cfb6eeb4 | 707 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 708 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
e87cc472 JP |
709 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
710 | genhash ? "failed" : "mismatch", | |
711 | &ip6h->saddr, ntohs(th->source), | |
712 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 713 | return true; |
cfb6eeb4 | 714 | } |
ba8e275a | 715 | #endif |
ff74e23f | 716 | return false; |
cfb6eeb4 | 717 | } |
cfb6eeb4 | 718 | |
b40cf18e ED |
719 | static void tcp_v6_init_req(struct request_sock *req, |
720 | const struct sock *sk_listener, | |
16bea70a OP |
721 | struct sk_buff *skb) |
722 | { | |
723 | struct inet_request_sock *ireq = inet_rsk(req); | |
b40cf18e | 724 | const struct ipv6_pinfo *np = inet6_sk(sk_listener); |
16bea70a OP |
725 | |
726 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
727 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
728 | ||
16bea70a | 729 | /* So that link locals have meaning */ |
b40cf18e | 730 | if (!sk_listener->sk_bound_dev_if && |
16bea70a | 731 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 732 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 733 | |
04317daf | 734 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 735 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 736 | np->rxopt.bits.rxinfo || |
16bea70a OP |
737 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
738 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 739 | refcount_inc(&skb->users); |
16bea70a OP |
740 | ireq->pktopts = skb; |
741 | } | |
742 | } | |
743 | ||
f964629e ED |
744 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
745 | struct flowi *fl, | |
4396e461 | 746 | const struct request_sock *req) |
d94e0417 | 747 | { |
f76b33c3 | 748 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
749 | } |
750 | ||
c6aefafb | 751 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 752 | .family = AF_INET6, |
2e6599cb | 753 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 754 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
755 | .send_ack = tcp_v6_reqsk_send_ack, |
756 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 757 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 758 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
759 | }; |
760 | ||
b2e4b3de | 761 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
762 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
763 | sizeof(struct ipv6hdr), | |
16bea70a | 764 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 765 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 766 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 767 | #endif |
16bea70a | 768 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
769 | #ifdef CONFIG_SYN_COOKIES |
770 | .cookie_init_seq = cookie_v6_init_sequence, | |
771 | #endif | |
d94e0417 | 772 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
773 | .init_seq = tcp_v6_init_seq, |
774 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 775 | .send_synack = tcp_v6_send_synack, |
16bea70a | 776 | }; |
cfb6eeb4 | 777 | |
a00e7444 | 778 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
779 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
780 | int oif, struct tcp_md5sig_key *key, int rst, | |
5119bd16 | 781 | u8 tclass, __be32 label) |
1da177e4 | 782 | { |
cf533ea5 ED |
783 | const struct tcphdr *th = tcp_hdr(skb); |
784 | struct tcphdr *t1; | |
1da177e4 | 785 | struct sk_buff *buff; |
4c9483b2 | 786 | struct flowi6 fl6; |
0f85feae | 787 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 788 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 789 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 790 | struct dst_entry *dst; |
81ada62d | 791 | __be32 *topt; |
1da177e4 | 792 | |
ee684b6f | 793 | if (tsecr) |
626e264d | 794 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 795 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
796 | if (key) |
797 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
798 | #endif | |
799 | ||
cfb6eeb4 | 800 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 801 | GFP_ATOMIC); |
63159f29 | 802 | if (!buff) |
1ab1457c | 803 | return; |
1da177e4 | 804 | |
cfb6eeb4 | 805 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 806 | |
d58ff351 | 807 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 808 | skb_reset_transport_header(buff); |
1da177e4 LT |
809 | |
810 | /* Swap the send and the receive. */ | |
811 | memset(t1, 0, sizeof(*t1)); | |
812 | t1->dest = th->source; | |
813 | t1->source = th->dest; | |
cfb6eeb4 | 814 | t1->doff = tot_len / 4; |
626e264d IJ |
815 | t1->seq = htonl(seq); |
816 | t1->ack_seq = htonl(ack); | |
817 | t1->ack = !rst || !th->ack; | |
818 | t1->rst = rst; | |
819 | t1->window = htons(win); | |
1da177e4 | 820 | |
81ada62d IJ |
821 | topt = (__be32 *)(t1 + 1); |
822 | ||
ee684b6f | 823 | if (tsecr) { |
626e264d IJ |
824 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
825 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
826 | *topt++ = htonl(tsval); |
827 | *topt++ = htonl(tsecr); | |
626e264d IJ |
828 | } |
829 | ||
cfb6eeb4 YH |
830 | #ifdef CONFIG_TCP_MD5SIG |
831 | if (key) { | |
81ada62d IJ |
832 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
833 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
834 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
835 | &ipv6_hdr(skb)->saddr, |
836 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
837 | } |
838 | #endif | |
839 | ||
4c9483b2 | 840 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
841 | fl6.daddr = ipv6_hdr(skb)->saddr; |
842 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 843 | fl6.flowlabel = label; |
1da177e4 | 844 | |
e5700aff DM |
845 | buff->ip_summed = CHECKSUM_PARTIAL; |
846 | buff->csum = 0; | |
847 | ||
4c9483b2 | 848 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 849 | |
4c9483b2 | 850 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 851 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 852 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
853 | else { |
854 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
855 | oif = skb->skb_iif; | |
856 | ||
857 | fl6.flowi6_oif = oif; | |
858 | } | |
1d2f7b2d | 859 | |
e110861f | 860 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
861 | fl6.fl6_dport = t1->dest; |
862 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 863 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 864 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 865 | |
c20121ae DL |
866 | /* Pass a socket to ip6_dst_lookup either it is for RST |
867 | * Underlying function will use this to retrieve the network | |
868 | * namespace | |
869 | */ | |
0e0d44ab | 870 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
871 | if (!IS_ERR(dst)) { |
872 | skb_dst_set(buff, dst); | |
92e55f41 | 873 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass); |
c10d9310 | 874 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 875 | if (rst) |
c10d9310 | 876 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 877 | return; |
1da177e4 LT |
878 | } |
879 | ||
880 | kfree_skb(buff); | |
881 | } | |
882 | ||
a00e7444 | 883 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 884 | { |
cf533ea5 | 885 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 886 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 887 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
888 | #ifdef CONFIG_TCP_MD5SIG |
889 | const __u8 *hash_location = NULL; | |
890 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
891 | unsigned char newhash[16]; | |
892 | int genhash; | |
893 | struct sock *sk1 = NULL; | |
894 | #endif | |
c24b14c4 | 895 | int oif = 0; |
1da177e4 | 896 | |
626e264d | 897 | if (th->rst) |
1da177e4 LT |
898 | return; |
899 | ||
c3658e8d ED |
900 | /* If sk not NULL, it means we did a successful lookup and incoming |
901 | * route had to be correct. prequeue might have dropped our dst. | |
902 | */ | |
903 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 904 | return; |
1da177e4 | 905 | |
cfb6eeb4 | 906 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 907 | rcu_read_lock(); |
658ddaaf | 908 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 909 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
910 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
911 | } else if (hash_location) { | |
658ddaaf SL |
912 | /* |
913 | * active side is lost. Try to find listening socket through | |
914 | * source port, and then find md5 key through listening socket. | |
915 | * we are not loose security here: | |
916 | * Incoming packet is checked with md5 hash with finding key, | |
917 | * no RST generated if md5 hash doesn't match. | |
918 | */ | |
919 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
a583636a CG |
920 | &tcp_hashinfo, NULL, 0, |
921 | &ipv6h->saddr, | |
5ba24953 | 922 | th->source, &ipv6h->daddr, |
4297a0ef DA |
923 | ntohs(th->source), tcp_v6_iif(skb), |
924 | tcp_v6_sdif(skb)); | |
658ddaaf | 925 | if (!sk1) |
3b24d854 | 926 | goto out; |
658ddaaf | 927 | |
658ddaaf SL |
928 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
929 | if (!key) | |
3b24d854 | 930 | goto out; |
658ddaaf | 931 | |
39f8e58e | 932 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 933 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 934 | goto out; |
658ddaaf | 935 | } |
cfb6eeb4 YH |
936 | #endif |
937 | ||
626e264d IJ |
938 | if (th->ack) |
939 | seq = ntohl(th->ack_seq); | |
940 | else | |
941 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
942 | (th->doff << 2); | |
1da177e4 | 943 | |
c24b14c4 SL |
944 | if (sk) { |
945 | oif = sk->sk_bound_dev_if; | |
946 | trace_tcp_send_reset(sk, skb); | |
947 | } | |
948 | ||
0f85feae | 949 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
950 | |
951 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
952 | out: |
953 | rcu_read_unlock(); | |
658ddaaf | 954 | #endif |
626e264d | 955 | } |
1da177e4 | 956 | |
a00e7444 | 957 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 958 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 959 | struct tcp_md5sig_key *key, u8 tclass, |
5119bd16 | 960 | __be32 label) |
626e264d | 961 | { |
0f85feae ED |
962 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
963 | tclass, label); | |
1da177e4 LT |
964 | } |
965 | ||
966 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
967 | { | |
8feaf0c0 | 968 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 969 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 970 | |
0f85feae | 971 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 972 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 973 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 974 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 975 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 976 | |
8feaf0c0 | 977 | inet_twsk_put(tw); |
1da177e4 LT |
978 | } |
979 | ||
a00e7444 | 980 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 981 | struct request_sock *req) |
1da177e4 | 982 | { |
3a19ce0e DL |
983 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
984 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
985 | */ | |
20a2b49f ED |
986 | /* RFC 7323 2.3 |
987 | * The window field (SEG.WND) of every outgoing segment, with the | |
988 | * exception of <SYN> segments, MUST be right-shifted by | |
989 | * Rcv.Wind.Shift bits: | |
990 | */ | |
0f85feae | 991 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 992 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
993 | tcp_rsk(req)->rcv_nxt, |
994 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 995 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 996 | req->ts_recent, sk->sk_bound_dev_if, |
30791ac4 | 997 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr), |
1d13a96c | 998 | 0, 0); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | ||
079096f1 | 1002 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1003 | { |
079096f1 | 1004 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1005 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1006 | |
af9b4738 | 1007 | if (!th->syn) |
c6aefafb | 1008 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1009 | #endif |
1010 | return sk; | |
1011 | } | |
1012 | ||
1da177e4 LT |
1013 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1014 | { | |
1da177e4 LT |
1015 | if (skb->protocol == htons(ETH_P_IP)) |
1016 | return tcp_v4_conn_request(sk, skb); | |
1017 | ||
1018 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1019 | goto drop; |
1da177e4 | 1020 | |
1fb6f159 OP |
1021 | return tcp_conn_request(&tcp6_request_sock_ops, |
1022 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1023 | |
1024 | drop: | |
9caad864 | 1025 | tcp_listendrop(sk); |
1da177e4 LT |
1026 | return 0; /* don't send reset */ |
1027 | } | |
1028 | ||
ebf6c9cb ED |
1029 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1030 | { | |
1031 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1032 | * and tcp_v6_fill_cb() are going to be called again. | |
1033 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1034 | */ | |
1035 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1036 | sizeof(struct inet6_skb_parm)); | |
1037 | } | |
1038 | ||
0c27171e | 1039 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1040 | struct request_sock *req, |
5e0724d0 ED |
1041 | struct dst_entry *dst, |
1042 | struct request_sock *req_unhash, | |
1043 | bool *own_req) | |
1da177e4 | 1044 | { |
634fb979 | 1045 | struct inet_request_sock *ireq; |
0c27171e ED |
1046 | struct ipv6_pinfo *newnp; |
1047 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 1048 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1049 | struct tcp6_sock *newtcp6sk; |
1050 | struct inet_sock *newinet; | |
1051 | struct tcp_sock *newtp; | |
1052 | struct sock *newsk; | |
cfb6eeb4 YH |
1053 | #ifdef CONFIG_TCP_MD5SIG |
1054 | struct tcp_md5sig_key *key; | |
1055 | #endif | |
3840a06e | 1056 | struct flowi6 fl6; |
1da177e4 LT |
1057 | |
1058 | if (skb->protocol == htons(ETH_P_IP)) { | |
1059 | /* | |
1060 | * v6 mapped | |
1061 | */ | |
1062 | ||
5e0724d0 ED |
1063 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1064 | req_unhash, own_req); | |
1da177e4 | 1065 | |
63159f29 | 1066 | if (!newsk) |
1da177e4 LT |
1067 | return NULL; |
1068 | ||
1069 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1070 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1071 | ||
1072 | newinet = inet_sk(newsk); | |
1073 | newnp = inet6_sk(newsk); | |
1074 | newtp = tcp_sk(newsk); | |
1075 | ||
1076 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1077 | ||
d1e559d0 | 1078 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1079 | |
8292a17a | 1080 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1081 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1082 | #ifdef CONFIG_TCP_MD5SIG |
1083 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1084 | #endif | |
1085 | ||
83eaddab | 1086 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1087 | newnp->ipv6_ac_list = NULL; |
1088 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1089 | newnp->pktoptions = NULL; |
1090 | newnp->opt = NULL; | |
870c3151 | 1091 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1092 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1093 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1094 | if (np->repflow) |
1095 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1096 | |
e6848976 ACM |
1097 | /* |
1098 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1099 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1100 | * that function for the gory details. -acme | |
1da177e4 | 1101 | */ |
1da177e4 LT |
1102 | |
1103 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1104 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1105 | Sync it now. |
1106 | */ | |
d83d8461 | 1107 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1108 | |
1109 | return newsk; | |
1110 | } | |
1111 | ||
634fb979 | 1112 | ireq = inet_rsk(req); |
1da177e4 LT |
1113 | |
1114 | if (sk_acceptq_is_full(sk)) | |
1115 | goto out_overflow; | |
1116 | ||
493f377d | 1117 | if (!dst) { |
f76b33c3 | 1118 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1119 | if (!dst) |
1da177e4 | 1120 | goto out; |
1ab1457c | 1121 | } |
1da177e4 LT |
1122 | |
1123 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1124 | if (!newsk) |
093d2823 | 1125 | goto out_nonewsk; |
1da177e4 | 1126 | |
e6848976 ACM |
1127 | /* |
1128 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1129 | * count here, tcp_create_openreq_child now does this for us, see the | |
1130 | * comment in that function for the gory details. -acme | |
1131 | */ | |
1da177e4 | 1132 | |
59eed279 | 1133 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1134 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1135 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1136 | |
1137 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1138 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1139 | ||
1140 | newtp = tcp_sk(newsk); | |
1141 | newinet = inet_sk(newsk); | |
1142 | newnp = inet6_sk(newsk); | |
1143 | ||
1144 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1145 | ||
634fb979 ED |
1146 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1147 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1148 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1149 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1150 | |
1ab1457c | 1151 | /* Now IPv6 options... |
1da177e4 LT |
1152 | |
1153 | First: no IPv4 options. | |
1154 | */ | |
f6d8bd05 | 1155 | newinet->inet_opt = NULL; |
83eaddab | 1156 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1157 | newnp->ipv6_ac_list = NULL; |
d35690be | 1158 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1159 | |
1160 | /* Clone RX bits */ | |
1161 | newnp->rxopt.all = np->rxopt.all; | |
1162 | ||
1da177e4 | 1163 | newnp->pktoptions = NULL; |
1da177e4 | 1164 | newnp->opt = NULL; |
870c3151 | 1165 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1166 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1167 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1168 | if (np->repflow) |
1169 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1170 | |
1171 | /* Clone native IPv6 options from listening socket (if any) | |
1172 | ||
1173 | Yes, keeping reference count would be much more clever, | |
1174 | but we make one more one thing there: reattach optmem | |
1175 | to newsk. | |
1176 | */ | |
56ac42bc HD |
1177 | opt = ireq->ipv6_opt; |
1178 | if (!opt) | |
1179 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1180 | if (opt) { |
1181 | opt = ipv6_dup_options(newsk, opt); | |
1182 | RCU_INIT_POINTER(newnp->opt, opt); | |
1183 | } | |
d83d8461 | 1184 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1185 | if (opt) |
1186 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1187 | opt->opt_flen; | |
1da177e4 | 1188 | |
81164413 DB |
1189 | tcp_ca_openreq_child(newsk, dst); |
1190 | ||
1da177e4 | 1191 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1192 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1193 | |
1da177e4 LT |
1194 | tcp_initialize_rcv_mss(newsk); |
1195 | ||
c720c7e8 ED |
1196 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1197 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1198 | |
cfb6eeb4 YH |
1199 | #ifdef CONFIG_TCP_MD5SIG |
1200 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1201 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1202 | if (key) { |
cfb6eeb4 YH |
1203 | /* We're using one, so create a matching key |
1204 | * on the newsk structure. If we fail to get | |
1205 | * memory, then we end up not copying the key | |
1206 | * across. Shucks. | |
1207 | */ | |
efe4208f | 1208 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
6797318e | 1209 | AF_INET6, 128, key->key, key->keylen, |
7450aaf6 | 1210 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1211 | } |
1212 | #endif | |
1213 | ||
093d2823 | 1214 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1215 | inet_csk_prepare_forced_close(newsk); |
1216 | tcp_done(newsk); | |
093d2823 BS |
1217 | goto out; |
1218 | } | |
5e0724d0 | 1219 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1220 | if (*own_req) { |
49a496c9 | 1221 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1222 | |
1223 | /* Clone pktoptions received with SYN, if we own the req */ | |
1224 | if (ireq->pktopts) { | |
1225 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1226 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1227 | consume_skb(ireq->pktopts); |
1228 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1229 | if (newnp->pktoptions) { |
1230 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1231 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1232 | } |
805c4bc0 | 1233 | } |
ce105008 | 1234 | } |
1da177e4 LT |
1235 | |
1236 | return newsk; | |
1237 | ||
1238 | out_overflow: | |
02a1d6e7 | 1239 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1240 | out_nonewsk: |
1da177e4 | 1241 | dst_release(dst); |
093d2823 | 1242 | out: |
9caad864 | 1243 | tcp_listendrop(sk); |
1da177e4 LT |
1244 | return NULL; |
1245 | } | |
1246 | ||
1da177e4 | 1247 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1248 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1249 | * |
1250 | * We have a potential double-lock case here, so even when | |
1251 | * doing backlog processing we use the BH locking scheme. | |
1252 | * This is because we cannot sleep with the original spinlock | |
1253 | * held. | |
1254 | */ | |
1255 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1256 | { | |
1257 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1258 | struct tcp_sock *tp; | |
1259 | struct sk_buff *opt_skb = NULL; | |
1260 | ||
1261 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1262 | goes to IPv4 receive handler and backlogged. | |
1263 | From backlog it always goes here. Kerboom... | |
1264 | Fortunately, tcp_rcv_established and rcv_established | |
1265 | handle them correctly, but it is not case with | |
1266 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1267 | */ | |
1268 | ||
1269 | if (skb->protocol == htons(ETH_P_IP)) | |
1270 | return tcp_v4_do_rcv(sk, skb); | |
1271 | ||
1da177e4 LT |
1272 | /* |
1273 | * socket locking is here for SMP purposes as backlog rcv | |
1274 | * is currently called with bh processing disabled. | |
1275 | */ | |
1276 | ||
1277 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1278 | ||
1279 | Yes, guys, it is the only place in our code, where we | |
1280 | may make it not affecting IPv4. | |
1281 | The rest of code is protocol independent, | |
1282 | and I do not like idea to uglify IPv4. | |
1283 | ||
1284 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1285 | looks not very well thought. For now we latch | |
1286 | options, received in the last packet, enqueued | |
1287 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1288 | --ANK (980728) |
1da177e4 LT |
1289 | */ |
1290 | if (np->rxopt.all) | |
7450aaf6 | 1291 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1292 | |
1293 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1294 | struct dst_entry *dst = sk->sk_rx_dst; |
1295 | ||
bdeab991 | 1296 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1297 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1298 | if (dst) { |
1299 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1300 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1301 | dst_release(dst); | |
1302 | sk->sk_rx_dst = NULL; | |
1303 | } | |
1304 | } | |
1305 | ||
e42e24c3 | 1306 | tcp_rcv_established(sk, skb, tcp_hdr(skb)); |
1da177e4 LT |
1307 | if (opt_skb) |
1308 | goto ipv6_pktoptions; | |
1309 | return 0; | |
1310 | } | |
1311 | ||
12e25e10 | 1312 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1313 | goto csum_err; |
1314 | ||
1ab1457c | 1315 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1316 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1317 | ||
1da177e4 LT |
1318 | if (!nsk) |
1319 | goto discard; | |
1320 | ||
4c99aa40 | 1321 | if (nsk != sk) { |
1da177e4 LT |
1322 | if (tcp_child_process(sk, nsk, skb)) |
1323 | goto reset; | |
1324 | if (opt_skb) | |
1325 | __kfree_skb(opt_skb); | |
1326 | return 0; | |
1327 | } | |
47482f13 | 1328 | } else |
bdeab991 | 1329 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1330 | |
72ab4a86 | 1331 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1332 | goto reset; |
1da177e4 LT |
1333 | if (opt_skb) |
1334 | goto ipv6_pktoptions; | |
1335 | return 0; | |
1336 | ||
1337 | reset: | |
cfb6eeb4 | 1338 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1339 | discard: |
1340 | if (opt_skb) | |
1341 | __kfree_skb(opt_skb); | |
1342 | kfree_skb(skb); | |
1343 | return 0; | |
1344 | csum_err: | |
c10d9310 ED |
1345 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1346 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1347 | goto discard; |
1348 | ||
1349 | ||
1350 | ipv6_pktoptions: | |
1351 | /* Do you ask, what is it? | |
1352 | ||
1353 | 1. skb was enqueued by tcp. | |
1354 | 2. skb is added to tail of read queue, rather than out of order. | |
1355 | 3. socket is not in passive state. | |
1356 | 4. Finally, it really contains options, which user wants to receive. | |
1357 | */ | |
1358 | tp = tcp_sk(sk); | |
1359 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1360 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1361 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1362 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1363 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1364 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1365 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1366 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1367 | if (np->repflow) |
1368 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1369 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1370 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1371 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1372 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1373 | } else { | |
1374 | __kfree_skb(opt_skb); | |
1375 | opt_skb = xchg(&np->pktoptions, NULL); | |
1376 | } | |
1377 | } | |
1378 | ||
800d55f1 | 1379 | kfree_skb(opt_skb); |
1da177e4 LT |
1380 | return 0; |
1381 | } | |
1382 | ||
2dc49d16 ND |
1383 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1384 | const struct tcphdr *th) | |
1385 | { | |
1386 | /* This is tricky: we move IP6CB at its correct location into | |
1387 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1388 | * _decode_session6() uses IP6CB(). | |
1389 | * barrier() makes sure compiler won't play aliasing games. | |
1390 | */ | |
1391 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1392 | sizeof(struct inet6_skb_parm)); | |
1393 | barrier(); | |
1394 | ||
1395 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1396 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1397 | skb->len - th->doff*4); | |
1398 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1399 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1400 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1401 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1402 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1403 | TCP_SKB_CB(skb)->has_rxtstamp = |
1404 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1405 | } |
1406 | ||
e5bbef20 | 1407 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1408 | { |
4297a0ef | 1409 | int sdif = inet6_sdif(skb); |
cf533ea5 | 1410 | const struct tcphdr *th; |
b71d1d42 | 1411 | const struct ipv6hdr *hdr; |
3b24d854 | 1412 | bool refcounted; |
1da177e4 LT |
1413 | struct sock *sk; |
1414 | int ret; | |
a86b1e30 | 1415 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1416 | |
1417 | if (skb->pkt_type != PACKET_HOST) | |
1418 | goto discard_it; | |
1419 | ||
1420 | /* | |
1421 | * Count it even if it's bad. | |
1422 | */ | |
90bbcc60 | 1423 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1424 | |
1425 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1426 | goto discard_it; | |
1427 | ||
ea1627c2 | 1428 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1429 | |
ea1627c2 | 1430 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1431 | goto bad_packet; |
1432 | if (!pskb_may_pull(skb, th->doff*4)) | |
1433 | goto discard_it; | |
1434 | ||
e4f45b7f | 1435 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1436 | goto csum_error; |
1da177e4 | 1437 | |
ea1627c2 | 1438 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1439 | hdr = ipv6_hdr(skb); |
1da177e4 | 1440 | |
4bdc3d66 | 1441 | lookup: |
a583636a | 1442 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1443 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1444 | &refcounted); |
1da177e4 LT |
1445 | if (!sk) |
1446 | goto no_tcp_socket; | |
1447 | ||
1448 | process: | |
1449 | if (sk->sk_state == TCP_TIME_WAIT) | |
1450 | goto do_time_wait; | |
1451 | ||
079096f1 ED |
1452 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1453 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 1454 | struct sock *nsk; |
079096f1 ED |
1455 | |
1456 | sk = req->rsk_listener; | |
079096f1 | 1457 | if (tcp_v6_inbound_md5_hash(sk, skb)) { |
e65c332d | 1458 | sk_drops_add(sk, skb); |
079096f1 ED |
1459 | reqsk_put(req); |
1460 | goto discard_it; | |
1461 | } | |
7716682c | 1462 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1463 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1464 | goto lookup; |
1465 | } | |
7716682c | 1466 | sock_hold(sk); |
3b24d854 | 1467 | refcounted = true; |
1f3b359f | 1468 | nsk = NULL; |
eeea10b8 ED |
1469 | if (!tcp_filter(sk, skb)) { |
1470 | th = (const struct tcphdr *)skb->data; | |
1471 | hdr = ipv6_hdr(skb); | |
1472 | tcp_v6_fill_cb(skb, hdr, th); | |
1f3b359f | 1473 | nsk = tcp_check_req(sk, skb, req, false); |
eeea10b8 | 1474 | } |
079096f1 ED |
1475 | if (!nsk) { |
1476 | reqsk_put(req); | |
7716682c | 1477 | goto discard_and_relse; |
079096f1 ED |
1478 | } |
1479 | if (nsk == sk) { | |
079096f1 ED |
1480 | reqsk_put(req); |
1481 | tcp_v6_restore_cb(skb); | |
1482 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1483 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1484 | goto discard_and_relse; |
079096f1 | 1485 | } else { |
7716682c | 1486 | sock_put(sk); |
079096f1 ED |
1487 | return 0; |
1488 | } | |
1489 | } | |
e802af9c | 1490 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1491 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1492 | goto discard_and_relse; |
1493 | } | |
1494 | ||
1da177e4 LT |
1495 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1496 | goto discard_and_relse; | |
1497 | ||
9ea88a15 DP |
1498 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1499 | goto discard_and_relse; | |
9ea88a15 | 1500 | |
ac6e7800 | 1501 | if (tcp_filter(sk, skb)) |
1da177e4 | 1502 | goto discard_and_relse; |
ac6e7800 ED |
1503 | th = (const struct tcphdr *)skb->data; |
1504 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1505 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1506 | |
1507 | skb->dev = NULL; | |
1508 | ||
e994b2f0 ED |
1509 | if (sk->sk_state == TCP_LISTEN) { |
1510 | ret = tcp_v6_do_rcv(sk, skb); | |
1511 | goto put_and_return; | |
1512 | } | |
1513 | ||
1514 | sk_incoming_cpu_update(sk); | |
1515 | ||
293b9c42 | 1516 | bh_lock_sock_nested(sk); |
a44d6eac | 1517 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1518 | ret = 0; |
1519 | if (!sock_owned_by_user(sk)) { | |
e7942d06 | 1520 | ret = tcp_v6_do_rcv(sk, skb); |
c9c33212 | 1521 | } else if (tcp_add_backlog(sk, skb)) { |
6b03a53a ZY |
1522 | goto discard_and_relse; |
1523 | } | |
1da177e4 LT |
1524 | bh_unlock_sock(sk); |
1525 | ||
e994b2f0 | 1526 | put_and_return: |
3b24d854 ED |
1527 | if (refcounted) |
1528 | sock_put(sk); | |
1da177e4 LT |
1529 | return ret ? -1 : 0; |
1530 | ||
1531 | no_tcp_socket: | |
1532 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1533 | goto discard_it; | |
1534 | ||
2dc49d16 ND |
1535 | tcp_v6_fill_cb(skb, hdr, th); |
1536 | ||
12e25e10 | 1537 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1538 | csum_error: |
90bbcc60 | 1539 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1540 | bad_packet: |
90bbcc60 | 1541 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1542 | } else { |
cfb6eeb4 | 1543 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1544 | } |
1545 | ||
1546 | discard_it: | |
1da177e4 LT |
1547 | kfree_skb(skb); |
1548 | return 0; | |
1549 | ||
1550 | discard_and_relse: | |
532182cd | 1551 | sk_drops_add(sk, skb); |
3b24d854 ED |
1552 | if (refcounted) |
1553 | sock_put(sk); | |
1da177e4 LT |
1554 | goto discard_it; |
1555 | ||
1556 | do_time_wait: | |
1557 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1558 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1559 | goto discard_it; |
1560 | } | |
1561 | ||
2dc49d16 ND |
1562 | tcp_v6_fill_cb(skb, hdr, th); |
1563 | ||
6a5dc9e5 ED |
1564 | if (tcp_checksum_complete(skb)) { |
1565 | inet_twsk_put(inet_twsk(sk)); | |
1566 | goto csum_error; | |
1da177e4 LT |
1567 | } |
1568 | ||
9469c7b4 | 1569 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1570 | case TCP_TW_SYN: |
1571 | { | |
1572 | struct sock *sk2; | |
1573 | ||
c346dca1 | 1574 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1575 | skb, __tcp_hdrlen(th), |
5ba24953 | 1576 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1577 | &ipv6_hdr(skb)->daddr, |
4297a0ef DA |
1578 | ntohs(th->dest), tcp_v6_iif(skb), |
1579 | sdif); | |
53b24b8f | 1580 | if (sk2) { |
295ff7ed | 1581 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1582 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1583 | sk = sk2; |
4ad19de8 | 1584 | tcp_v6_restore_cb(skb); |
3b24d854 | 1585 | refcounted = false; |
1da177e4 LT |
1586 | goto process; |
1587 | } | |
1da177e4 | 1588 | } |
275757e6 GS |
1589 | /* to ACK */ |
1590 | /* fall through */ | |
1da177e4 LT |
1591 | case TCP_TW_ACK: |
1592 | tcp_v6_timewait_ack(sk, skb); | |
1593 | break; | |
1594 | case TCP_TW_RST: | |
271c3b9b FW |
1595 | tcp_v6_send_reset(sk, skb); |
1596 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1597 | goto discard_it; | |
4aa956d8 WY |
1598 | case TCP_TW_SUCCESS: |
1599 | ; | |
1da177e4 LT |
1600 | } |
1601 | goto discard_it; | |
1602 | } | |
1603 | ||
c7109986 ED |
1604 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1605 | { | |
1606 | const struct ipv6hdr *hdr; | |
1607 | const struct tcphdr *th; | |
1608 | struct sock *sk; | |
1609 | ||
1610 | if (skb->pkt_type != PACKET_HOST) | |
1611 | return; | |
1612 | ||
1613 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1614 | return; | |
1615 | ||
1616 | hdr = ipv6_hdr(skb); | |
1617 | th = tcp_hdr(skb); | |
1618 | ||
1619 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1620 | return; | |
1621 | ||
870c3151 | 1622 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1623 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1624 | &hdr->saddr, th->source, | |
1625 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1626 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1627 | if (sk) { |
1628 | skb->sk = sk; | |
1629 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1630 | if (sk_fullsock(sk)) { |
d0c294c5 | 1631 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1632 | |
c7109986 | 1633 | if (dst) |
5d299f3d | 1634 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1635 | if (dst && |
f3f12135 | 1636 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1637 | skb_dst_set_noref(skb, dst); |
1638 | } | |
1639 | } | |
1640 | } | |
1641 | ||
ccb7c410 DM |
1642 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1643 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1644 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1645 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1646 | }; |
1647 | ||
3b401a81 | 1648 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1649 | .queue_xmit = inet6_csk_xmit, |
1650 | .send_check = tcp_v6_send_check, | |
1651 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1652 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1653 | .conn_request = tcp_v6_conn_request, |
1654 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1655 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1656 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1657 | .setsockopt = ipv6_setsockopt, |
1658 | .getsockopt = ipv6_getsockopt, | |
1659 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1660 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1661 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1662 | .compat_setsockopt = compat_ipv6_setsockopt, |
1663 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1664 | #endif |
4fab9071 | 1665 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1666 | }; |
1667 | ||
cfb6eeb4 | 1668 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1669 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1670 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1671 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1672 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1673 | }; |
a928630a | 1674 | #endif |
cfb6eeb4 | 1675 | |
1da177e4 LT |
1676 | /* |
1677 | * TCP over IPv4 via INET6 API | |
1678 | */ | |
3b401a81 | 1679 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1680 | .queue_xmit = ip_queue_xmit, |
1681 | .send_check = tcp_v4_send_check, | |
1682 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1683 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1684 | .conn_request = tcp_v6_conn_request, |
1685 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1686 | .net_header_len = sizeof(struct iphdr), |
1687 | .setsockopt = ipv6_setsockopt, | |
1688 | .getsockopt = ipv6_getsockopt, | |
1689 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1690 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1691 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1692 | .compat_setsockopt = compat_ipv6_setsockopt, |
1693 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1694 | #endif |
4fab9071 | 1695 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1696 | }; |
1697 | ||
cfb6eeb4 | 1698 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1699 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1700 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1701 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1702 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1703 | }; |
a928630a | 1704 | #endif |
cfb6eeb4 | 1705 | |
1da177e4 LT |
1706 | /* NOTE: A lot of things set to zero explicitly by call to |
1707 | * sk_alloc() so need not be done here. | |
1708 | */ | |
1709 | static int tcp_v6_init_sock(struct sock *sk) | |
1710 | { | |
6687e988 | 1711 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1712 | |
900f65d3 | 1713 | tcp_init_sock(sk); |
1da177e4 | 1714 | |
8292a17a | 1715 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1716 | |
cfb6eeb4 | 1717 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1718 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1719 | #endif |
1720 | ||
1da177e4 LT |
1721 | return 0; |
1722 | } | |
1723 | ||
7d06b2e0 | 1724 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1725 | { |
1da177e4 | 1726 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1727 | inet6_destroy_sock(sk); |
1da177e4 LT |
1728 | } |
1729 | ||
952a10be | 1730 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1731 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1732 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1733 | const struct request_sock *req, int i) |
1da177e4 | 1734 | { |
fa76ce73 | 1735 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1736 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1737 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1738 | |
1739 | if (ttd < 0) | |
1740 | ttd = 0; | |
1741 | ||
1da177e4 LT |
1742 | seq_printf(seq, |
1743 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1744 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1745 | i, |
1746 | src->s6_addr32[0], src->s6_addr32[1], | |
1747 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1748 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1749 | dest->s6_addr32[0], dest->s6_addr32[1], |
1750 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1751 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1752 | TCP_SYN_RECV, |
4c99aa40 | 1753 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1754 | 1, /* timers active (only the expire timer) */ |
1755 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1756 | req->num_timeout, |
aa3a0c8c ED |
1757 | from_kuid_munged(seq_user_ns(seq), |
1758 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1759 | 0, /* non standard timer */ |
1da177e4 LT |
1760 | 0, /* open_requests have no inode */ |
1761 | 0, req); | |
1762 | } | |
1763 | ||
1764 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1765 | { | |
b71d1d42 | 1766 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1767 | __u16 destp, srcp; |
1768 | int timer_active; | |
1769 | unsigned long timer_expires; | |
cf533ea5 ED |
1770 | const struct inet_sock *inet = inet_sk(sp); |
1771 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1772 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1773 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1774 | int rx_queue; |
1775 | int state; | |
1da177e4 | 1776 | |
efe4208f ED |
1777 | dest = &sp->sk_v6_daddr; |
1778 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1779 | destp = ntohs(inet->inet_dport); |
1780 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1781 | |
ce3cf4ec | 1782 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1783 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1784 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1785 | timer_active = 1; |
463c84b9 ACM |
1786 | timer_expires = icsk->icsk_timeout; |
1787 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1788 | timer_active = 4; |
463c84b9 | 1789 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1790 | } else if (timer_pending(&sp->sk_timer)) { |
1791 | timer_active = 2; | |
1792 | timer_expires = sp->sk_timer.expires; | |
1793 | } else { | |
1794 | timer_active = 0; | |
1795 | timer_expires = jiffies; | |
1796 | } | |
1797 | ||
00fd38d9 ED |
1798 | state = sk_state_load(sp); |
1799 | if (state == TCP_LISTEN) | |
1800 | rx_queue = sp->sk_ack_backlog; | |
1801 | else | |
1802 | /* Because we don't lock the socket, | |
1803 | * we might find a transient negative value. | |
1804 | */ | |
1805 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1806 | ||
1da177e4 LT |
1807 | seq_printf(seq, |
1808 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1809 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1810 | i, |
1811 | src->s6_addr32[0], src->s6_addr32[1], | |
1812 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1813 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1814 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1815 | state, |
1816 | tp->write_seq - tp->snd_una, | |
1817 | rx_queue, | |
1da177e4 | 1818 | timer_active, |
a399a805 | 1819 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1820 | icsk->icsk_retransmits, |
a7cb5a49 | 1821 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1822 | icsk->icsk_probes_out, |
1da177e4 | 1823 | sock_i_ino(sp), |
41c6d650 | 1824 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1825 | jiffies_to_clock_t(icsk->icsk_rto), |
1826 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1827 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1828 | tp->snd_cwnd, |
00fd38d9 | 1829 | state == TCP_LISTEN ? |
0536fcc0 | 1830 | fastopenq->max_qlen : |
0a672f74 | 1831 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1832 | ); |
1833 | } | |
1834 | ||
1ab1457c | 1835 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1836 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1837 | { |
789f558c | 1838 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1839 | const struct in6_addr *dest, *src; |
1da177e4 | 1840 | __u16 destp, srcp; |
1da177e4 | 1841 | |
efe4208f ED |
1842 | dest = &tw->tw_v6_daddr; |
1843 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1844 | destp = ntohs(tw->tw_dport); |
1845 | srcp = ntohs(tw->tw_sport); | |
1846 | ||
1847 | seq_printf(seq, | |
1848 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1849 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1850 | i, |
1851 | src->s6_addr32[0], src->s6_addr32[1], | |
1852 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1853 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1854 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1855 | tw->tw_substate, 0, 0, | |
a399a805 | 1856 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 1857 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
1858 | } |
1859 | ||
1da177e4 LT |
1860 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1861 | { | |
1862 | struct tcp_iter_state *st; | |
05dbc7b5 | 1863 | struct sock *sk = v; |
1da177e4 LT |
1864 | |
1865 | if (v == SEQ_START_TOKEN) { | |
1866 | seq_puts(seq, | |
1867 | " sl " | |
1868 | "local_address " | |
1869 | "remote_address " | |
1870 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1871 | " uid timeout inode\n"); | |
1872 | goto out; | |
1873 | } | |
1874 | st = seq->private; | |
1875 | ||
079096f1 ED |
1876 | if (sk->sk_state == TCP_TIME_WAIT) |
1877 | get_timewait6_sock(seq, v, st->num); | |
1878 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1879 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1880 | else |
1881 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1882 | out: |
1883 | return 0; | |
1884 | } | |
1885 | ||
73cb88ec AV |
1886 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1887 | .owner = THIS_MODULE, | |
1888 | .open = tcp_seq_open, | |
1889 | .read = seq_read, | |
1890 | .llseek = seq_lseek, | |
1891 | .release = seq_release_net | |
1892 | }; | |
1893 | ||
1da177e4 | 1894 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1895 | .name = "tcp6", |
1896 | .family = AF_INET6, | |
73cb88ec | 1897 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1898 | .seq_ops = { |
1899 | .show = tcp6_seq_show, | |
1900 | }, | |
1da177e4 LT |
1901 | }; |
1902 | ||
2c8c1e72 | 1903 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1904 | { |
6f8b13bc | 1905 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1906 | } |
1907 | ||
6f8b13bc | 1908 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1909 | { |
6f8b13bc | 1910 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1911 | } |
1912 | #endif | |
1913 | ||
1914 | struct proto tcpv6_prot = { | |
1915 | .name = "TCPv6", | |
1916 | .owner = THIS_MODULE, | |
1917 | .close = tcp_close, | |
1918 | .connect = tcp_v6_connect, | |
1919 | .disconnect = tcp_disconnect, | |
463c84b9 | 1920 | .accept = inet_csk_accept, |
1da177e4 LT |
1921 | .ioctl = tcp_ioctl, |
1922 | .init = tcp_v6_init_sock, | |
1923 | .destroy = tcp_v6_destroy_sock, | |
1924 | .shutdown = tcp_shutdown, | |
1925 | .setsockopt = tcp_setsockopt, | |
1926 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 1927 | .keepalive = tcp_set_keepalive, |
1da177e4 | 1928 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1929 | .sendmsg = tcp_sendmsg, |
1930 | .sendpage = tcp_sendpage, | |
1da177e4 | 1931 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1932 | .release_cb = tcp_release_cb, |
496611d7 | 1933 | .hash = inet6_hash, |
ab1e0a13 ACM |
1934 | .unhash = inet_unhash, |
1935 | .get_port = inet_csk_get_port, | |
1da177e4 | 1936 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 1937 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 1938 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1939 | .sockets_allocated = &tcp_sockets_allocated, |
1940 | .memory_allocated = &tcp_memory_allocated, | |
1941 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1942 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1943 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
1944 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
1945 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
1946 | .max_header = MAX_TCP_HEADER, |
1947 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 1948 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 1949 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1950 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1951 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1952 | .no_autobind = true, |
543d9cfe ACM |
1953 | #ifdef CONFIG_COMPAT |
1954 | .compat_setsockopt = compat_tcp_setsockopt, | |
1955 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 1956 | #endif |
c1e64e29 | 1957 | .diag_destroy = tcp_abort, |
1da177e4 LT |
1958 | }; |
1959 | ||
a8e3bb34 DA |
1960 | /* thinking of making this const? Don't. |
1961 | * early_demux can change based on sysctl. | |
1962 | */ | |
39294c3d | 1963 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1964 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 1965 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
1966 | .handler = tcp_v6_rcv, |
1967 | .err_handler = tcp_v6_err, | |
1968 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1969 | }; | |
1970 | ||
1da177e4 LT |
1971 | static struct inet_protosw tcpv6_protosw = { |
1972 | .type = SOCK_STREAM, | |
1973 | .protocol = IPPROTO_TCP, | |
1974 | .prot = &tcpv6_prot, | |
1975 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1976 | .flags = INET_PROTOSW_PERMANENT | |
1977 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1978 | }; |
1979 | ||
2c8c1e72 | 1980 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1981 | { |
5677242f DL |
1982 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1983 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1984 | } |
1985 | ||
2c8c1e72 | 1986 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1987 | { |
5677242f | 1988 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1989 | } |
1990 | ||
2c8c1e72 | 1991 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 1992 | { |
1946e672 | 1993 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
1994 | } |
1995 | ||
1996 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1997 | .init = tcpv6_net_init, |
1998 | .exit = tcpv6_net_exit, | |
1999 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2000 | }; |
2001 | ||
7f4e4868 | 2002 | int __init tcpv6_init(void) |
1da177e4 | 2003 | { |
7f4e4868 DL |
2004 | int ret; |
2005 | ||
3336288a VY |
2006 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2007 | if (ret) | |
c6b641a4 | 2008 | goto out; |
3336288a | 2009 | |
1da177e4 | 2010 | /* register inet6 protocol */ |
7f4e4868 DL |
2011 | ret = inet6_register_protosw(&tcpv6_protosw); |
2012 | if (ret) | |
2013 | goto out_tcpv6_protocol; | |
2014 | ||
93ec926b | 2015 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2016 | if (ret) |
2017 | goto out_tcpv6_protosw; | |
2018 | out: | |
2019 | return ret; | |
ae0f7d5f | 2020 | |
7f4e4868 DL |
2021 | out_tcpv6_protosw: |
2022 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2023 | out_tcpv6_protocol: |
2024 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2025 | goto out; |
2026 | } | |
2027 | ||
09f7709f | 2028 | void tcpv6_exit(void) |
7f4e4868 | 2029 | { |
93ec926b | 2030 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2031 | inet6_unregister_protosw(&tcpv6_protosw); |
2032 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2033 | } |