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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 | ||
a00e7444 ED |
72 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb); |
73 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
6edafaaf | 74 | struct request_sock *req); |
1da177e4 LT |
75 | |
76 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 77 | |
3b401a81 SH |
78 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
79 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 80 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
81 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 | 83 | #else |
51723935 | 84 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 85 | const struct in6_addr *addr) |
9501f972 YH |
86 | { |
87 | return NULL; | |
88 | } | |
a928630a | 89 | #endif |
1da177e4 | 90 | |
fae6ef87 NC |
91 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
92 | { | |
93 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 94 | |
5037e9ef | 95 | if (dst && dst_hold_safe(dst)) { |
ca777eff ED |
96 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
97 | ||
ca777eff ED |
98 | sk->sk_rx_dst = dst; |
99 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
b197df4f | 100 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 101 | } |
fae6ef87 NC |
102 | } |
103 | ||
84b114b9 | 104 | static u32 tcp_v6_init_seq(const struct sk_buff *skb) |
1da177e4 | 105 | { |
84b114b9 ED |
106 | return secure_tcpv6_seq(ipv6_hdr(skb)->daddr.s6_addr32, |
107 | ipv6_hdr(skb)->saddr.s6_addr32, | |
108 | tcp_hdr(skb)->dest, | |
109 | tcp_hdr(skb)->source); | |
110 | } | |
111 | ||
5d2ed052 | 112 | static u32 tcp_v6_init_ts_off(const struct net *net, const struct sk_buff *skb) |
84b114b9 | 113 | { |
5d2ed052 | 114 | return secure_tcpv6_ts_off(net, ipv6_hdr(skb)->daddr.s6_addr32, |
84b114b9 | 115 | ipv6_hdr(skb)->saddr.s6_addr32); |
1da177e4 LT |
116 | } |
117 | ||
1ab1457c | 118 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
119 | int addr_len) |
120 | { | |
121 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 122 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 123 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
124 | struct ipv6_pinfo *np = inet6_sk(sk); |
125 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 126 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 127 | struct ipv6_txoptions *opt; |
4c9483b2 | 128 | struct flowi6 fl6; |
1da177e4 LT |
129 | struct dst_entry *dst; |
130 | int addr_type; | |
131 | int err; | |
1946e672 | 132 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
1da177e4 | 133 | |
1ab1457c | 134 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
135 | return -EINVAL; |
136 | ||
1ab1457c | 137 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 138 | return -EAFNOSUPPORT; |
1da177e4 | 139 | |
4c9483b2 | 140 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
141 | |
142 | if (np->sndflow) { | |
4c9483b2 DM |
143 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
144 | IP6_ECN_flow_init(fl6.flowlabel); | |
145 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 146 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 147 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 148 | if (!flowlabel) |
1da177e4 | 149 | return -EINVAL; |
1da177e4 LT |
150 | fl6_sock_release(flowlabel); |
151 | } | |
152 | } | |
153 | ||
154 | /* | |
1ab1457c YH |
155 | * connect() to INADDR_ANY means loopback (BSD'ism). |
156 | */ | |
157 | ||
052d2369 JL |
158 | if (ipv6_addr_any(&usin->sin6_addr)) { |
159 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
160 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
161 | &usin->sin6_addr); | |
162 | else | |
163 | usin->sin6_addr = in6addr_loopback; | |
164 | } | |
1da177e4 LT |
165 | |
166 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
167 | ||
4c99aa40 | 168 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
169 | return -ENETUNREACH; |
170 | ||
171 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
172 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
173 | usin->sin6_scope_id) { | |
174 | /* If interface is set while binding, indices | |
175 | * must coincide. | |
176 | */ | |
177 | if (sk->sk_bound_dev_if && | |
178 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
179 | return -EINVAL; | |
180 | ||
181 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
182 | } | |
183 | ||
184 | /* Connect to link-local address requires an interface */ | |
185 | if (!sk->sk_bound_dev_if) | |
186 | return -EINVAL; | |
187 | } | |
188 | ||
189 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 190 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
191 | tp->rx_opt.ts_recent = 0; |
192 | tp->rx_opt.ts_recent_stamp = 0; | |
193 | tp->write_seq = 0; | |
194 | } | |
195 | ||
efe4208f | 196 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 197 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
198 | |
199 | /* | |
200 | * TCP over IPv4 | |
201 | */ | |
202 | ||
052d2369 | 203 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 204 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
205 | struct sockaddr_in sin; |
206 | ||
207 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
208 | ||
209 | if (__ipv6_only_sock(sk)) | |
210 | return -ENETUNREACH; | |
211 | ||
212 | sin.sin_family = AF_INET; | |
213 | sin.sin_port = usin->sin6_port; | |
214 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
215 | ||
d83d8461 | 216 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 217 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
218 | #ifdef CONFIG_TCP_MD5SIG |
219 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
220 | #endif | |
1da177e4 LT |
221 | |
222 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
223 | ||
224 | if (err) { | |
d83d8461 ACM |
225 | icsk->icsk_ext_hdr_len = exthdrlen; |
226 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 227 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
228 | #ifdef CONFIG_TCP_MD5SIG |
229 | tp->af_specific = &tcp_sock_ipv6_specific; | |
230 | #endif | |
1da177e4 | 231 | goto failure; |
1da177e4 | 232 | } |
d1e559d0 | 233 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
234 | |
235 | return err; | |
236 | } | |
237 | ||
efe4208f ED |
238 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
239 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 240 | |
4c9483b2 | 241 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 242 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 243 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
244 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
245 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
246 | fl6.fl6_dport = usin->sin6_port; |
247 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 248 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 249 | |
1e1d04e6 | 250 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 251 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 252 | |
4c9483b2 | 253 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 254 | |
0e0d44ab | 255 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
256 | if (IS_ERR(dst)) { |
257 | err = PTR_ERR(dst); | |
1da177e4 | 258 | goto failure; |
14e50e57 | 259 | } |
1da177e4 | 260 | |
63159f29 | 261 | if (!saddr) { |
4c9483b2 | 262 | saddr = &fl6.saddr; |
efe4208f | 263 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
264 | } |
265 | ||
266 | /* set the source address */ | |
4e3fd7a0 | 267 | np->saddr = *saddr; |
c720c7e8 | 268 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 269 | |
f83ef8c0 | 270 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 271 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 272 | |
d83d8461 | 273 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
274 | if (opt) |
275 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
276 | opt->opt_nflen; | |
1da177e4 LT |
277 | |
278 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
279 | ||
c720c7e8 | 280 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
281 | |
282 | tcp_set_state(sk, TCP_SYN_SENT); | |
1946e672 | 283 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
284 | if (err) |
285 | goto late_failure; | |
286 | ||
877d1f62 | 287 | sk_set_txhash(sk); |
9e7ceb06 | 288 | |
00355fa5 | 289 | if (likely(!tp->repair)) { |
00355fa5 | 290 | if (!tp->write_seq) |
84b114b9 ED |
291 | tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32, |
292 | sk->sk_v6_daddr.s6_addr32, | |
293 | inet->inet_sport, | |
294 | inet->inet_dport); | |
5d2ed052 ED |
295 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
296 | np->saddr.s6_addr32, | |
84b114b9 | 297 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 298 | } |
1da177e4 | 299 | |
19f6d3f3 WW |
300 | if (tcp_fastopen_defer_connect(sk, &err)) |
301 | return err; | |
302 | if (err) | |
303 | goto late_failure; | |
304 | ||
1da177e4 LT |
305 | err = tcp_connect(sk); |
306 | if (err) | |
307 | goto late_failure; | |
308 | ||
309 | return 0; | |
310 | ||
311 | late_failure: | |
312 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 313 | failure: |
c720c7e8 | 314 | inet->inet_dport = 0; |
1da177e4 LT |
315 | sk->sk_route_caps = 0; |
316 | return err; | |
317 | } | |
318 | ||
563d34d0 ED |
319 | static void tcp_v6_mtu_reduced(struct sock *sk) |
320 | { | |
321 | struct dst_entry *dst; | |
322 | ||
323 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
324 | return; | |
325 | ||
326 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
327 | if (!dst) | |
328 | return; | |
329 | ||
330 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
331 | tcp_sync_mss(sk, dst_mtu(dst)); | |
332 | tcp_simple_retransmit(sk); | |
333 | } | |
334 | } | |
335 | ||
1da177e4 | 336 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 337 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 338 | { |
4c99aa40 | 339 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 340 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
341 | struct net *net = dev_net(skb->dev); |
342 | struct request_sock *fastopen; | |
1da177e4 | 343 | struct ipv6_pinfo *np; |
1ab1457c | 344 | struct tcp_sock *tp; |
0a672f74 | 345 | __u32 seq, snd_una; |
2215089b | 346 | struct sock *sk; |
9cf74903 | 347 | bool fatal; |
2215089b | 348 | int err; |
1da177e4 | 349 | |
2215089b ED |
350 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
351 | &hdr->daddr, th->dest, | |
352 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 353 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 354 | |
2215089b | 355 | if (!sk) { |
a16292a0 ED |
356 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
357 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
358 | return; |
359 | } | |
360 | ||
361 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 362 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
363 | return; |
364 | } | |
2215089b | 365 | seq = ntohl(th->seq); |
9cf74903 | 366 | fatal = icmpv6_err_convert(type, code, &err); |
2215089b | 367 | if (sk->sk_state == TCP_NEW_SYN_RECV) |
9cf74903 | 368 | return tcp_req_err(sk, seq, fatal); |
1da177e4 LT |
369 | |
370 | bh_lock_sock(sk); | |
563d34d0 | 371 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 372 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
373 | |
374 | if (sk->sk_state == TCP_CLOSE) | |
375 | goto out; | |
376 | ||
e802af9c | 377 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 378 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
379 | goto out; |
380 | } | |
381 | ||
1da177e4 | 382 | tp = tcp_sk(sk); |
0a672f74 YC |
383 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
384 | fastopen = tp->fastopen_rsk; | |
385 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 386 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 387 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 388 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
389 | goto out; |
390 | } | |
391 | ||
392 | np = inet6_sk(sk); | |
393 | ||
ec18d9a2 | 394 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
395 | if (!sock_owned_by_user(sk)) { |
396 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 397 | |
45caeaa5 JM |
398 | if (dst) |
399 | dst->ops->redirect(dst, sk, skb); | |
400 | } | |
50a75a89 | 401 | goto out; |
ec18d9a2 DM |
402 | } |
403 | ||
1da177e4 | 404 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
405 | /* We are not interested in TCP_LISTEN and open_requests |
406 | * (SYN-ACKs send out by Linux are always <576bytes so | |
407 | * they should go through unfragmented). | |
408 | */ | |
409 | if (sk->sk_state == TCP_LISTEN) | |
410 | goto out; | |
411 | ||
93b36cf3 HFS |
412 | if (!ip6_sk_accept_pmtu(sk)) |
413 | goto out; | |
414 | ||
563d34d0 ED |
415 | tp->mtu_info = ntohl(info); |
416 | if (!sock_owned_by_user(sk)) | |
417 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 418 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 419 | &sk->sk_tsq_flags)) |
d013ef2a | 420 | sock_hold(sk); |
1da177e4 LT |
421 | goto out; |
422 | } | |
423 | ||
1da177e4 | 424 | |
60236fdd | 425 | /* Might be for an request_sock */ |
1da177e4 | 426 | switch (sk->sk_state) { |
1da177e4 | 427 | case TCP_SYN_SENT: |
0a672f74 YC |
428 | case TCP_SYN_RECV: |
429 | /* Only in fast or simultaneous open. If a fast open socket is | |
430 | * is already accepted it is treated as a connected one below. | |
431 | */ | |
63159f29 | 432 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
433 | break; |
434 | ||
1da177e4 | 435 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
436 | sk->sk_err = err; |
437 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
438 | ||
439 | tcp_done(sk); | |
440 | } else | |
441 | sk->sk_err_soft = err; | |
442 | goto out; | |
443 | } | |
444 | ||
445 | if (!sock_owned_by_user(sk) && np->recverr) { | |
446 | sk->sk_err = err; | |
447 | sk->sk_error_report(sk); | |
448 | } else | |
449 | sk->sk_err_soft = err; | |
450 | ||
451 | out: | |
452 | bh_unlock_sock(sk); | |
453 | sock_put(sk); | |
454 | } | |
455 | ||
456 | ||
0f935dbe | 457 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 458 | struct flowi *fl, |
3840a06e | 459 | struct request_sock *req, |
ca6fb065 | 460 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 461 | enum tcp_synack_type synack_type) |
1da177e4 | 462 | { |
634fb979 | 463 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 464 | struct ipv6_pinfo *np = inet6_sk(sk); |
56ac42bc | 465 | struct ipv6_txoptions *opt; |
d6274bd8 | 466 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 467 | struct sk_buff *skb; |
9494218f | 468 | int err = -ENOMEM; |
1da177e4 | 469 | |
9f10d3f6 | 470 | /* First, grab a route. */ |
f76b33c3 ED |
471 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
472 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 473 | goto done; |
9494218f | 474 | |
b3d05147 | 475 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 476 | |
1da177e4 | 477 | if (skb) { |
634fb979 ED |
478 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
479 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 480 | |
634fb979 | 481 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 482 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
483 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
484 | ||
3e4006f0 | 485 | rcu_read_lock(); |
56ac42bc HD |
486 | opt = ireq->ipv6_opt; |
487 | if (!opt) | |
488 | opt = rcu_dereference(np->opt); | |
92e55f41 | 489 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass); |
3e4006f0 | 490 | rcu_read_unlock(); |
b9df3cb8 | 491 | err = net_xmit_eval(err); |
1da177e4 LT |
492 | } |
493 | ||
494 | done: | |
1da177e4 LT |
495 | return err; |
496 | } | |
497 | ||
72659ecc | 498 | |
60236fdd | 499 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 500 | { |
56ac42bc | 501 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 502 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
503 | } |
504 | ||
cfb6eeb4 | 505 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 506 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 507 | const struct in6_addr *addr) |
cfb6eeb4 | 508 | { |
a915da9b | 509 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
510 | } |
511 | ||
b83e3deb | 512 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 513 | const struct sock *addr_sk) |
cfb6eeb4 | 514 | { |
efe4208f | 515 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
516 | } |
517 | ||
8917a777 ID |
518 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
519 | char __user *optval, int optlen) | |
cfb6eeb4 YH |
520 | { |
521 | struct tcp_md5sig cmd; | |
522 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
8917a777 | 523 | u8 prefixlen; |
cfb6eeb4 YH |
524 | |
525 | if (optlen < sizeof(cmd)) | |
526 | return -EINVAL; | |
527 | ||
528 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
529 | return -EFAULT; | |
530 | ||
531 | if (sin6->sin6_family != AF_INET6) | |
532 | return -EINVAL; | |
533 | ||
8917a777 ID |
534 | if (optname == TCP_MD5SIG_EXT && |
535 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
536 | prefixlen = cmd.tcpm_prefixlen; | |
537 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
538 | prefixlen > 32)) | |
539 | return -EINVAL; | |
540 | } else { | |
541 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
542 | } | |
543 | ||
cfb6eeb4 | 544 | if (!cmd.tcpm_keylen) { |
e773e4fa | 545 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 546 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
8917a777 | 547 | AF_INET, prefixlen); |
a915da9b | 548 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 | 549 | AF_INET6, prefixlen); |
cfb6eeb4 YH |
550 | } |
551 | ||
552 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
553 | return -EINVAL; | |
554 | ||
a915da9b ED |
555 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
556 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
8917a777 | 557 | AF_INET, prefixlen, cmd.tcpm_key, |
6797318e | 558 | cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 | 559 | |
a915da9b | 560 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 ID |
561 | AF_INET6, prefixlen, cmd.tcpm_key, |
562 | cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
563 | } |
564 | ||
19689e38 ED |
565 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
566 | const struct in6_addr *daddr, | |
567 | const struct in6_addr *saddr, | |
568 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 569 | { |
cfb6eeb4 | 570 | struct tcp6_pseudohdr *bp; |
49a72dfb | 571 | struct scatterlist sg; |
19689e38 | 572 | struct tcphdr *_th; |
8d26d76d | 573 | |
19689e38 | 574 | bp = hp->scratch; |
cfb6eeb4 | 575 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
576 | bp->saddr = *saddr; |
577 | bp->daddr = *daddr; | |
49a72dfb | 578 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 579 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 580 | |
19689e38 ED |
581 | _th = (struct tcphdr *)(bp + 1); |
582 | memcpy(_th, th, sizeof(*th)); | |
583 | _th->check = 0; | |
584 | ||
585 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
586 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
587 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 588 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 589 | } |
c7da57a1 | 590 | |
19689e38 | 591 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 592 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 593 | const struct tcphdr *th) |
49a72dfb AL |
594 | { |
595 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 596 | struct ahash_request *req; |
49a72dfb AL |
597 | |
598 | hp = tcp_get_md5sig_pool(); | |
599 | if (!hp) | |
600 | goto clear_hash_noput; | |
cf80e0e4 | 601 | req = hp->md5_req; |
49a72dfb | 602 | |
cf80e0e4 | 603 | if (crypto_ahash_init(req)) |
49a72dfb | 604 | goto clear_hash; |
19689e38 | 605 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
606 | goto clear_hash; |
607 | if (tcp_md5_hash_key(hp, key)) | |
608 | goto clear_hash; | |
cf80e0e4 HX |
609 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
610 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 611 | goto clear_hash; |
cfb6eeb4 | 612 | |
cfb6eeb4 | 613 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 614 | return 0; |
49a72dfb | 615 | |
cfb6eeb4 YH |
616 | clear_hash: |
617 | tcp_put_md5sig_pool(); | |
618 | clear_hash_noput: | |
619 | memset(md5_hash, 0, 16); | |
49a72dfb | 620 | return 1; |
cfb6eeb4 YH |
621 | } |
622 | ||
39f8e58e ED |
623 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
624 | const struct tcp_md5sig_key *key, | |
318cf7aa | 625 | const struct sock *sk, |
318cf7aa | 626 | const struct sk_buff *skb) |
cfb6eeb4 | 627 | { |
b71d1d42 | 628 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 629 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 630 | struct ahash_request *req; |
318cf7aa | 631 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 632 | |
39f8e58e ED |
633 | if (sk) { /* valid for establish/request sockets */ |
634 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 635 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 636 | } else { |
b71d1d42 | 637 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
638 | saddr = &ip6h->saddr; |
639 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 640 | } |
49a72dfb AL |
641 | |
642 | hp = tcp_get_md5sig_pool(); | |
643 | if (!hp) | |
644 | goto clear_hash_noput; | |
cf80e0e4 | 645 | req = hp->md5_req; |
49a72dfb | 646 | |
cf80e0e4 | 647 | if (crypto_ahash_init(req)) |
49a72dfb AL |
648 | goto clear_hash; |
649 | ||
19689e38 | 650 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
651 | goto clear_hash; |
652 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
653 | goto clear_hash; | |
654 | if (tcp_md5_hash_key(hp, key)) | |
655 | goto clear_hash; | |
cf80e0e4 HX |
656 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
657 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
658 | goto clear_hash; |
659 | ||
660 | tcp_put_md5sig_pool(); | |
661 | return 0; | |
662 | ||
663 | clear_hash: | |
664 | tcp_put_md5sig_pool(); | |
665 | clear_hash_noput: | |
666 | memset(md5_hash, 0, 16); | |
667 | return 1; | |
cfb6eeb4 YH |
668 | } |
669 | ||
ba8e275a ED |
670 | #endif |
671 | ||
672 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
673 | const struct sk_buff *skb) | |
cfb6eeb4 | 674 | { |
ba8e275a | 675 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 676 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 677 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 678 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 679 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 680 | int genhash; |
cfb6eeb4 YH |
681 | u8 newhash[16]; |
682 | ||
683 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 684 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 685 | |
785957d3 DM |
686 | /* We've parsed the options - do we have a hash? */ |
687 | if (!hash_expected && !hash_location) | |
ff74e23f | 688 | return false; |
785957d3 DM |
689 | |
690 | if (hash_expected && !hash_location) { | |
c10d9310 | 691 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 692 | return true; |
cfb6eeb4 YH |
693 | } |
694 | ||
785957d3 | 695 | if (!hash_expected && hash_location) { |
c10d9310 | 696 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 697 | return true; |
cfb6eeb4 YH |
698 | } |
699 | ||
700 | /* check the signature */ | |
49a72dfb AL |
701 | genhash = tcp_v6_md5_hash_skb(newhash, |
702 | hash_expected, | |
39f8e58e | 703 | NULL, skb); |
49a72dfb | 704 | |
cfb6eeb4 | 705 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 706 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
e87cc472 JP |
707 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
708 | genhash ? "failed" : "mismatch", | |
709 | &ip6h->saddr, ntohs(th->source), | |
710 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 711 | return true; |
cfb6eeb4 | 712 | } |
ba8e275a | 713 | #endif |
ff74e23f | 714 | return false; |
cfb6eeb4 | 715 | } |
cfb6eeb4 | 716 | |
b40cf18e ED |
717 | static void tcp_v6_init_req(struct request_sock *req, |
718 | const struct sock *sk_listener, | |
16bea70a OP |
719 | struct sk_buff *skb) |
720 | { | |
721 | struct inet_request_sock *ireq = inet_rsk(req); | |
b40cf18e | 722 | const struct ipv6_pinfo *np = inet6_sk(sk_listener); |
16bea70a OP |
723 | |
724 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
725 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
726 | ||
16bea70a | 727 | /* So that link locals have meaning */ |
b40cf18e | 728 | if (!sk_listener->sk_bound_dev_if && |
16bea70a | 729 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 730 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 731 | |
04317daf | 732 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 733 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 734 | np->rxopt.bits.rxinfo || |
16bea70a OP |
735 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
736 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 737 | refcount_inc(&skb->users); |
16bea70a OP |
738 | ireq->pktopts = skb; |
739 | } | |
740 | } | |
741 | ||
f964629e ED |
742 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
743 | struct flowi *fl, | |
4396e461 | 744 | const struct request_sock *req) |
d94e0417 | 745 | { |
f76b33c3 | 746 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
747 | } |
748 | ||
c6aefafb | 749 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 750 | .family = AF_INET6, |
2e6599cb | 751 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 752 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
753 | .send_ack = tcp_v6_reqsk_send_ack, |
754 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 755 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 756 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
757 | }; |
758 | ||
b2e4b3de | 759 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
760 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
761 | sizeof(struct ipv6hdr), | |
16bea70a | 762 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 763 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 764 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 765 | #endif |
16bea70a | 766 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
767 | #ifdef CONFIG_SYN_COOKIES |
768 | .cookie_init_seq = cookie_v6_init_sequence, | |
769 | #endif | |
d94e0417 | 770 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
771 | .init_seq = tcp_v6_init_seq, |
772 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 773 | .send_synack = tcp_v6_send_synack, |
16bea70a | 774 | }; |
cfb6eeb4 | 775 | |
a00e7444 | 776 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
777 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
778 | int oif, struct tcp_md5sig_key *key, int rst, | |
5119bd16 | 779 | u8 tclass, __be32 label) |
1da177e4 | 780 | { |
cf533ea5 ED |
781 | const struct tcphdr *th = tcp_hdr(skb); |
782 | struct tcphdr *t1; | |
1da177e4 | 783 | struct sk_buff *buff; |
4c9483b2 | 784 | struct flowi6 fl6; |
0f85feae | 785 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 786 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 787 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 788 | struct dst_entry *dst; |
81ada62d | 789 | __be32 *topt; |
1da177e4 | 790 | |
ee684b6f | 791 | if (tsecr) |
626e264d | 792 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 793 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
794 | if (key) |
795 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
796 | #endif | |
797 | ||
cfb6eeb4 | 798 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 799 | GFP_ATOMIC); |
63159f29 | 800 | if (!buff) |
1ab1457c | 801 | return; |
1da177e4 | 802 | |
cfb6eeb4 | 803 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 804 | |
d58ff351 | 805 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 806 | skb_reset_transport_header(buff); |
1da177e4 LT |
807 | |
808 | /* Swap the send and the receive. */ | |
809 | memset(t1, 0, sizeof(*t1)); | |
810 | t1->dest = th->source; | |
811 | t1->source = th->dest; | |
cfb6eeb4 | 812 | t1->doff = tot_len / 4; |
626e264d IJ |
813 | t1->seq = htonl(seq); |
814 | t1->ack_seq = htonl(ack); | |
815 | t1->ack = !rst || !th->ack; | |
816 | t1->rst = rst; | |
817 | t1->window = htons(win); | |
1da177e4 | 818 | |
81ada62d IJ |
819 | topt = (__be32 *)(t1 + 1); |
820 | ||
ee684b6f | 821 | if (tsecr) { |
626e264d IJ |
822 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
823 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
824 | *topt++ = htonl(tsval); |
825 | *topt++ = htonl(tsecr); | |
626e264d IJ |
826 | } |
827 | ||
cfb6eeb4 YH |
828 | #ifdef CONFIG_TCP_MD5SIG |
829 | if (key) { | |
81ada62d IJ |
830 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
831 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
832 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
833 | &ipv6_hdr(skb)->saddr, |
834 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
835 | } |
836 | #endif | |
837 | ||
4c9483b2 | 838 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
839 | fl6.daddr = ipv6_hdr(skb)->saddr; |
840 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 841 | fl6.flowlabel = label; |
1da177e4 | 842 | |
e5700aff DM |
843 | buff->ip_summed = CHECKSUM_PARTIAL; |
844 | buff->csum = 0; | |
845 | ||
4c9483b2 | 846 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 847 | |
4c9483b2 | 848 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 849 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 850 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
851 | else { |
852 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
853 | oif = skb->skb_iif; | |
854 | ||
855 | fl6.flowi6_oif = oif; | |
856 | } | |
1d2f7b2d | 857 | |
e110861f | 858 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
859 | fl6.fl6_dport = t1->dest; |
860 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 861 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 862 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 863 | |
c20121ae DL |
864 | /* Pass a socket to ip6_dst_lookup either it is for RST |
865 | * Underlying function will use this to retrieve the network | |
866 | * namespace | |
867 | */ | |
0e0d44ab | 868 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
869 | if (!IS_ERR(dst)) { |
870 | skb_dst_set(buff, dst); | |
92e55f41 | 871 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass); |
c10d9310 | 872 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 873 | if (rst) |
c10d9310 | 874 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 875 | return; |
1da177e4 LT |
876 | } |
877 | ||
878 | kfree_skb(buff); | |
879 | } | |
880 | ||
a00e7444 | 881 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 882 | { |
cf533ea5 | 883 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 884 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 885 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
886 | #ifdef CONFIG_TCP_MD5SIG |
887 | const __u8 *hash_location = NULL; | |
888 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
889 | unsigned char newhash[16]; | |
890 | int genhash; | |
891 | struct sock *sk1 = NULL; | |
892 | #endif | |
9c76a114 | 893 | int oif; |
1da177e4 | 894 | |
626e264d | 895 | if (th->rst) |
1da177e4 LT |
896 | return; |
897 | ||
c3658e8d ED |
898 | /* If sk not NULL, it means we did a successful lookup and incoming |
899 | * route had to be correct. prequeue might have dropped our dst. | |
900 | */ | |
901 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 902 | return; |
1da177e4 | 903 | |
cfb6eeb4 | 904 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 905 | rcu_read_lock(); |
658ddaaf | 906 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 907 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
908 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
909 | } else if (hash_location) { | |
658ddaaf SL |
910 | /* |
911 | * active side is lost. Try to find listening socket through | |
912 | * source port, and then find md5 key through listening socket. | |
913 | * we are not loose security here: | |
914 | * Incoming packet is checked with md5 hash with finding key, | |
915 | * no RST generated if md5 hash doesn't match. | |
916 | */ | |
917 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
a583636a CG |
918 | &tcp_hashinfo, NULL, 0, |
919 | &ipv6h->saddr, | |
5ba24953 | 920 | th->source, &ipv6h->daddr, |
4297a0ef DA |
921 | ntohs(th->source), tcp_v6_iif(skb), |
922 | tcp_v6_sdif(skb)); | |
658ddaaf | 923 | if (!sk1) |
3b24d854 | 924 | goto out; |
658ddaaf | 925 | |
658ddaaf SL |
926 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
927 | if (!key) | |
3b24d854 | 928 | goto out; |
658ddaaf | 929 | |
39f8e58e | 930 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 931 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 932 | goto out; |
658ddaaf | 933 | } |
cfb6eeb4 YH |
934 | #endif |
935 | ||
626e264d IJ |
936 | if (th->ack) |
937 | seq = ntohl(th->ack_seq); | |
938 | else | |
939 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
940 | (th->doff << 2); | |
1da177e4 | 941 | |
9c76a114 | 942 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 943 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
944 | |
945 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
946 | out: |
947 | rcu_read_unlock(); | |
658ddaaf | 948 | #endif |
626e264d | 949 | } |
1da177e4 | 950 | |
a00e7444 | 951 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 952 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 953 | struct tcp_md5sig_key *key, u8 tclass, |
5119bd16 | 954 | __be32 label) |
626e264d | 955 | { |
0f85feae ED |
956 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
957 | tclass, label); | |
1da177e4 LT |
958 | } |
959 | ||
960 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
961 | { | |
8feaf0c0 | 962 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 963 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 964 | |
0f85feae | 965 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 966 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 967 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 968 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 969 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 970 | |
8feaf0c0 | 971 | inet_twsk_put(tw); |
1da177e4 LT |
972 | } |
973 | ||
a00e7444 | 974 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 975 | struct request_sock *req) |
1da177e4 | 976 | { |
3a19ce0e DL |
977 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
978 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
979 | */ | |
20a2b49f ED |
980 | /* RFC 7323 2.3 |
981 | * The window field (SEG.WND) of every outgoing segment, with the | |
982 | * exception of <SYN> segments, MUST be right-shifted by | |
983 | * Rcv.Wind.Shift bits: | |
984 | */ | |
0f85feae | 985 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 986 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
987 | tcp_rsk(req)->rcv_nxt, |
988 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 989 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 990 | req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
991 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
992 | 0, 0); | |
1da177e4 LT |
993 | } |
994 | ||
995 | ||
079096f1 | 996 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 997 | { |
079096f1 | 998 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 999 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1000 | |
af9b4738 | 1001 | if (!th->syn) |
c6aefafb | 1002 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1003 | #endif |
1004 | return sk; | |
1005 | } | |
1006 | ||
1da177e4 LT |
1007 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1008 | { | |
1da177e4 LT |
1009 | if (skb->protocol == htons(ETH_P_IP)) |
1010 | return tcp_v4_conn_request(sk, skb); | |
1011 | ||
1012 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1013 | goto drop; |
1da177e4 | 1014 | |
1fb6f159 OP |
1015 | return tcp_conn_request(&tcp6_request_sock_ops, |
1016 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1017 | |
1018 | drop: | |
9caad864 | 1019 | tcp_listendrop(sk); |
1da177e4 LT |
1020 | return 0; /* don't send reset */ |
1021 | } | |
1022 | ||
ebf6c9cb ED |
1023 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1024 | { | |
1025 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1026 | * and tcp_v6_fill_cb() are going to be called again. | |
1027 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1028 | */ | |
1029 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1030 | sizeof(struct inet6_skb_parm)); | |
1031 | } | |
1032 | ||
0c27171e | 1033 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1034 | struct request_sock *req, |
5e0724d0 ED |
1035 | struct dst_entry *dst, |
1036 | struct request_sock *req_unhash, | |
1037 | bool *own_req) | |
1da177e4 | 1038 | { |
634fb979 | 1039 | struct inet_request_sock *ireq; |
0c27171e ED |
1040 | struct ipv6_pinfo *newnp; |
1041 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 1042 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1043 | struct tcp6_sock *newtcp6sk; |
1044 | struct inet_sock *newinet; | |
1045 | struct tcp_sock *newtp; | |
1046 | struct sock *newsk; | |
cfb6eeb4 YH |
1047 | #ifdef CONFIG_TCP_MD5SIG |
1048 | struct tcp_md5sig_key *key; | |
1049 | #endif | |
3840a06e | 1050 | struct flowi6 fl6; |
1da177e4 LT |
1051 | |
1052 | if (skb->protocol == htons(ETH_P_IP)) { | |
1053 | /* | |
1054 | * v6 mapped | |
1055 | */ | |
1056 | ||
5e0724d0 ED |
1057 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1058 | req_unhash, own_req); | |
1da177e4 | 1059 | |
63159f29 | 1060 | if (!newsk) |
1da177e4 LT |
1061 | return NULL; |
1062 | ||
1063 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1064 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1065 | ||
1066 | newinet = inet_sk(newsk); | |
1067 | newnp = inet6_sk(newsk); | |
1068 | newtp = tcp_sk(newsk); | |
1069 | ||
1070 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1071 | ||
d1e559d0 | 1072 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1073 | |
8292a17a | 1074 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1075 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1076 | #ifdef CONFIG_TCP_MD5SIG |
1077 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1078 | #endif | |
1079 | ||
83eaddab | 1080 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1081 | newnp->ipv6_ac_list = NULL; |
1082 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1083 | newnp->pktoptions = NULL; |
1084 | newnp->opt = NULL; | |
870c3151 | 1085 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1086 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1087 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1088 | if (np->repflow) |
1089 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1090 | |
e6848976 ACM |
1091 | /* |
1092 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1093 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1094 | * that function for the gory details. -acme | |
1da177e4 | 1095 | */ |
1da177e4 LT |
1096 | |
1097 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1098 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1099 | Sync it now. |
1100 | */ | |
d83d8461 | 1101 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1102 | |
1103 | return newsk; | |
1104 | } | |
1105 | ||
634fb979 | 1106 | ireq = inet_rsk(req); |
1da177e4 LT |
1107 | |
1108 | if (sk_acceptq_is_full(sk)) | |
1109 | goto out_overflow; | |
1110 | ||
493f377d | 1111 | if (!dst) { |
f76b33c3 | 1112 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1113 | if (!dst) |
1da177e4 | 1114 | goto out; |
1ab1457c | 1115 | } |
1da177e4 LT |
1116 | |
1117 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1118 | if (!newsk) |
093d2823 | 1119 | goto out_nonewsk; |
1da177e4 | 1120 | |
e6848976 ACM |
1121 | /* |
1122 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1123 | * count here, tcp_create_openreq_child now does this for us, see the | |
1124 | * comment in that function for the gory details. -acme | |
1125 | */ | |
1da177e4 | 1126 | |
59eed279 | 1127 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1128 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1129 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1130 | |
1131 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1132 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1133 | ||
1134 | newtp = tcp_sk(newsk); | |
1135 | newinet = inet_sk(newsk); | |
1136 | newnp = inet6_sk(newsk); | |
1137 | ||
1138 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1139 | ||
634fb979 ED |
1140 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1141 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1142 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1143 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1144 | |
1ab1457c | 1145 | /* Now IPv6 options... |
1da177e4 LT |
1146 | |
1147 | First: no IPv4 options. | |
1148 | */ | |
f6d8bd05 | 1149 | newinet->inet_opt = NULL; |
83eaddab | 1150 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1151 | newnp->ipv6_ac_list = NULL; |
d35690be | 1152 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1153 | |
1154 | /* Clone RX bits */ | |
1155 | newnp->rxopt.all = np->rxopt.all; | |
1156 | ||
1da177e4 | 1157 | newnp->pktoptions = NULL; |
1da177e4 | 1158 | newnp->opt = NULL; |
870c3151 | 1159 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1160 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1161 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1162 | if (np->repflow) |
1163 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1164 | |
1165 | /* Clone native IPv6 options from listening socket (if any) | |
1166 | ||
1167 | Yes, keeping reference count would be much more clever, | |
1168 | but we make one more one thing there: reattach optmem | |
1169 | to newsk. | |
1170 | */ | |
56ac42bc HD |
1171 | opt = ireq->ipv6_opt; |
1172 | if (!opt) | |
1173 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1174 | if (opt) { |
1175 | opt = ipv6_dup_options(newsk, opt); | |
1176 | RCU_INIT_POINTER(newnp->opt, opt); | |
1177 | } | |
d83d8461 | 1178 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1179 | if (opt) |
1180 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1181 | opt->opt_flen; | |
1da177e4 | 1182 | |
81164413 DB |
1183 | tcp_ca_openreq_child(newsk, dst); |
1184 | ||
1da177e4 | 1185 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1186 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1187 | |
1da177e4 LT |
1188 | tcp_initialize_rcv_mss(newsk); |
1189 | ||
c720c7e8 ED |
1190 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1191 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1192 | |
cfb6eeb4 YH |
1193 | #ifdef CONFIG_TCP_MD5SIG |
1194 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1195 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1196 | if (key) { |
cfb6eeb4 YH |
1197 | /* We're using one, so create a matching key |
1198 | * on the newsk structure. If we fail to get | |
1199 | * memory, then we end up not copying the key | |
1200 | * across. Shucks. | |
1201 | */ | |
efe4208f | 1202 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
6797318e | 1203 | AF_INET6, 128, key->key, key->keylen, |
7450aaf6 | 1204 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1205 | } |
1206 | #endif | |
1207 | ||
093d2823 | 1208 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1209 | inet_csk_prepare_forced_close(newsk); |
1210 | tcp_done(newsk); | |
093d2823 BS |
1211 | goto out; |
1212 | } | |
5e0724d0 | 1213 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1214 | if (*own_req) { |
49a496c9 | 1215 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1216 | |
1217 | /* Clone pktoptions received with SYN, if we own the req */ | |
1218 | if (ireq->pktopts) { | |
1219 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1220 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1221 | consume_skb(ireq->pktopts); |
1222 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1223 | if (newnp->pktoptions) { |
1224 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1225 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1226 | } |
805c4bc0 | 1227 | } |
ce105008 | 1228 | } |
1da177e4 LT |
1229 | |
1230 | return newsk; | |
1231 | ||
1232 | out_overflow: | |
02a1d6e7 | 1233 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1234 | out_nonewsk: |
1da177e4 | 1235 | dst_release(dst); |
093d2823 | 1236 | out: |
9caad864 | 1237 | tcp_listendrop(sk); |
1da177e4 LT |
1238 | return NULL; |
1239 | } | |
1240 | ||
1da177e4 | 1241 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1242 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1243 | * |
1244 | * We have a potential double-lock case here, so even when | |
1245 | * doing backlog processing we use the BH locking scheme. | |
1246 | * This is because we cannot sleep with the original spinlock | |
1247 | * held. | |
1248 | */ | |
1249 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1250 | { | |
1251 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1252 | struct tcp_sock *tp; | |
1253 | struct sk_buff *opt_skb = NULL; | |
1254 | ||
1255 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1256 | goes to IPv4 receive handler and backlogged. | |
1257 | From backlog it always goes here. Kerboom... | |
1258 | Fortunately, tcp_rcv_established and rcv_established | |
1259 | handle them correctly, but it is not case with | |
1260 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1261 | */ | |
1262 | ||
1263 | if (skb->protocol == htons(ETH_P_IP)) | |
1264 | return tcp_v4_do_rcv(sk, skb); | |
1265 | ||
1da177e4 LT |
1266 | /* |
1267 | * socket locking is here for SMP purposes as backlog rcv | |
1268 | * is currently called with bh processing disabled. | |
1269 | */ | |
1270 | ||
1271 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1272 | ||
1273 | Yes, guys, it is the only place in our code, where we | |
1274 | may make it not affecting IPv4. | |
1275 | The rest of code is protocol independent, | |
1276 | and I do not like idea to uglify IPv4. | |
1277 | ||
1278 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1279 | looks not very well thought. For now we latch | |
1280 | options, received in the last packet, enqueued | |
1281 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1282 | --ANK (980728) |
1da177e4 LT |
1283 | */ |
1284 | if (np->rxopt.all) | |
7450aaf6 | 1285 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1286 | |
1287 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1288 | struct dst_entry *dst = sk->sk_rx_dst; |
1289 | ||
bdeab991 | 1290 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1291 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1292 | if (dst) { |
1293 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1294 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1295 | dst_release(dst); | |
1296 | sk->sk_rx_dst = NULL; | |
1297 | } | |
1298 | } | |
1299 | ||
e42e24c3 | 1300 | tcp_rcv_established(sk, skb, tcp_hdr(skb)); |
1da177e4 LT |
1301 | if (opt_skb) |
1302 | goto ipv6_pktoptions; | |
1303 | return 0; | |
1304 | } | |
1305 | ||
12e25e10 | 1306 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1307 | goto csum_err; |
1308 | ||
1ab1457c | 1309 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1310 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1311 | ||
1da177e4 LT |
1312 | if (!nsk) |
1313 | goto discard; | |
1314 | ||
4c99aa40 | 1315 | if (nsk != sk) { |
1da177e4 LT |
1316 | if (tcp_child_process(sk, nsk, skb)) |
1317 | goto reset; | |
1318 | if (opt_skb) | |
1319 | __kfree_skb(opt_skb); | |
1320 | return 0; | |
1321 | } | |
47482f13 | 1322 | } else |
bdeab991 | 1323 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1324 | |
72ab4a86 | 1325 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1326 | goto reset; |
1da177e4 LT |
1327 | if (opt_skb) |
1328 | goto ipv6_pktoptions; | |
1329 | return 0; | |
1330 | ||
1331 | reset: | |
cfb6eeb4 | 1332 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1333 | discard: |
1334 | if (opt_skb) | |
1335 | __kfree_skb(opt_skb); | |
1336 | kfree_skb(skb); | |
1337 | return 0; | |
1338 | csum_err: | |
c10d9310 ED |
1339 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1340 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1341 | goto discard; |
1342 | ||
1343 | ||
1344 | ipv6_pktoptions: | |
1345 | /* Do you ask, what is it? | |
1346 | ||
1347 | 1. skb was enqueued by tcp. | |
1348 | 2. skb is added to tail of read queue, rather than out of order. | |
1349 | 3. socket is not in passive state. | |
1350 | 4. Finally, it really contains options, which user wants to receive. | |
1351 | */ | |
1352 | tp = tcp_sk(sk); | |
1353 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1354 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1355 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1356 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1357 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1358 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1359 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1360 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1361 | if (np->repflow) |
1362 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1363 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1364 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1365 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1366 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1367 | } else { | |
1368 | __kfree_skb(opt_skb); | |
1369 | opt_skb = xchg(&np->pktoptions, NULL); | |
1370 | } | |
1371 | } | |
1372 | ||
800d55f1 | 1373 | kfree_skb(opt_skb); |
1da177e4 LT |
1374 | return 0; |
1375 | } | |
1376 | ||
2dc49d16 ND |
1377 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1378 | const struct tcphdr *th) | |
1379 | { | |
1380 | /* This is tricky: we move IP6CB at its correct location into | |
1381 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1382 | * _decode_session6() uses IP6CB(). | |
1383 | * barrier() makes sure compiler won't play aliasing games. | |
1384 | */ | |
1385 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1386 | sizeof(struct inet6_skb_parm)); | |
1387 | barrier(); | |
1388 | ||
1389 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1390 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1391 | skb->len - th->doff*4); | |
1392 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1393 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1394 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1395 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1396 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1397 | TCP_SKB_CB(skb)->has_rxtstamp = |
1398 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1399 | } |
1400 | ||
e5bbef20 | 1401 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1402 | { |
4297a0ef | 1403 | int sdif = inet6_sdif(skb); |
cf533ea5 | 1404 | const struct tcphdr *th; |
b71d1d42 | 1405 | const struct ipv6hdr *hdr; |
3b24d854 | 1406 | bool refcounted; |
1da177e4 LT |
1407 | struct sock *sk; |
1408 | int ret; | |
a86b1e30 | 1409 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1410 | |
1411 | if (skb->pkt_type != PACKET_HOST) | |
1412 | goto discard_it; | |
1413 | ||
1414 | /* | |
1415 | * Count it even if it's bad. | |
1416 | */ | |
90bbcc60 | 1417 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1418 | |
1419 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1420 | goto discard_it; | |
1421 | ||
ea1627c2 | 1422 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1423 | |
ea1627c2 | 1424 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1425 | goto bad_packet; |
1426 | if (!pskb_may_pull(skb, th->doff*4)) | |
1427 | goto discard_it; | |
1428 | ||
e4f45b7f | 1429 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1430 | goto csum_error; |
1da177e4 | 1431 | |
ea1627c2 | 1432 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1433 | hdr = ipv6_hdr(skb); |
1da177e4 | 1434 | |
4bdc3d66 | 1435 | lookup: |
a583636a | 1436 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1437 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1438 | &refcounted); |
1da177e4 LT |
1439 | if (!sk) |
1440 | goto no_tcp_socket; | |
1441 | ||
1442 | process: | |
1443 | if (sk->sk_state == TCP_TIME_WAIT) | |
1444 | goto do_time_wait; | |
1445 | ||
079096f1 ED |
1446 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1447 | struct request_sock *req = inet_reqsk(sk); | |
7716682c | 1448 | struct sock *nsk; |
079096f1 ED |
1449 | |
1450 | sk = req->rsk_listener; | |
1451 | tcp_v6_fill_cb(skb, hdr, th); | |
1452 | if (tcp_v6_inbound_md5_hash(sk, skb)) { | |
e65c332d | 1453 | sk_drops_add(sk, skb); |
079096f1 ED |
1454 | reqsk_put(req); |
1455 | goto discard_it; | |
1456 | } | |
7716682c | 1457 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1458 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1459 | goto lookup; |
1460 | } | |
7716682c | 1461 | sock_hold(sk); |
3b24d854 | 1462 | refcounted = true; |
d624d276 ED |
1463 | if (tcp_filter(sk, skb)) |
1464 | goto discard_and_relse; | |
7716682c | 1465 | nsk = tcp_check_req(sk, skb, req, false); |
079096f1 ED |
1466 | if (!nsk) { |
1467 | reqsk_put(req); | |
7716682c | 1468 | goto discard_and_relse; |
079096f1 ED |
1469 | } |
1470 | if (nsk == sk) { | |
079096f1 ED |
1471 | reqsk_put(req); |
1472 | tcp_v6_restore_cb(skb); | |
1473 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1474 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1475 | goto discard_and_relse; |
079096f1 | 1476 | } else { |
7716682c | 1477 | sock_put(sk); |
079096f1 ED |
1478 | return 0; |
1479 | } | |
1480 | } | |
e802af9c | 1481 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1482 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1483 | goto discard_and_relse; |
1484 | } | |
1485 | ||
1da177e4 LT |
1486 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1487 | goto discard_and_relse; | |
1488 | ||
2dc49d16 ND |
1489 | tcp_v6_fill_cb(skb, hdr, th); |
1490 | ||
9ea88a15 DP |
1491 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1492 | goto discard_and_relse; | |
9ea88a15 | 1493 | |
ac6e7800 | 1494 | if (tcp_filter(sk, skb)) |
1da177e4 | 1495 | goto discard_and_relse; |
ac6e7800 ED |
1496 | th = (const struct tcphdr *)skb->data; |
1497 | hdr = ipv6_hdr(skb); | |
1da177e4 LT |
1498 | |
1499 | skb->dev = NULL; | |
1500 | ||
e994b2f0 ED |
1501 | if (sk->sk_state == TCP_LISTEN) { |
1502 | ret = tcp_v6_do_rcv(sk, skb); | |
1503 | goto put_and_return; | |
1504 | } | |
1505 | ||
1506 | sk_incoming_cpu_update(sk); | |
1507 | ||
293b9c42 | 1508 | bh_lock_sock_nested(sk); |
a44d6eac | 1509 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1510 | ret = 0; |
1511 | if (!sock_owned_by_user(sk)) { | |
e7942d06 | 1512 | ret = tcp_v6_do_rcv(sk, skb); |
c9c33212 | 1513 | } else if (tcp_add_backlog(sk, skb)) { |
6b03a53a ZY |
1514 | goto discard_and_relse; |
1515 | } | |
1da177e4 LT |
1516 | bh_unlock_sock(sk); |
1517 | ||
e994b2f0 | 1518 | put_and_return: |
3b24d854 ED |
1519 | if (refcounted) |
1520 | sock_put(sk); | |
1da177e4 LT |
1521 | return ret ? -1 : 0; |
1522 | ||
1523 | no_tcp_socket: | |
1524 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1525 | goto discard_it; | |
1526 | ||
2dc49d16 ND |
1527 | tcp_v6_fill_cb(skb, hdr, th); |
1528 | ||
12e25e10 | 1529 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1530 | csum_error: |
90bbcc60 | 1531 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1532 | bad_packet: |
90bbcc60 | 1533 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1534 | } else { |
cfb6eeb4 | 1535 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1536 | } |
1537 | ||
1538 | discard_it: | |
1da177e4 LT |
1539 | kfree_skb(skb); |
1540 | return 0; | |
1541 | ||
1542 | discard_and_relse: | |
532182cd | 1543 | sk_drops_add(sk, skb); |
3b24d854 ED |
1544 | if (refcounted) |
1545 | sock_put(sk); | |
1da177e4 LT |
1546 | goto discard_it; |
1547 | ||
1548 | do_time_wait: | |
1549 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1550 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1551 | goto discard_it; |
1552 | } | |
1553 | ||
2dc49d16 ND |
1554 | tcp_v6_fill_cb(skb, hdr, th); |
1555 | ||
6a5dc9e5 ED |
1556 | if (tcp_checksum_complete(skb)) { |
1557 | inet_twsk_put(inet_twsk(sk)); | |
1558 | goto csum_error; | |
1da177e4 LT |
1559 | } |
1560 | ||
9469c7b4 | 1561 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1562 | case TCP_TW_SYN: |
1563 | { | |
1564 | struct sock *sk2; | |
1565 | ||
c346dca1 | 1566 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1567 | skb, __tcp_hdrlen(th), |
5ba24953 | 1568 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1569 | &ipv6_hdr(skb)->daddr, |
4297a0ef DA |
1570 | ntohs(th->dest), tcp_v6_iif(skb), |
1571 | sdif); | |
53b24b8f | 1572 | if (sk2) { |
295ff7ed | 1573 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1574 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1575 | sk = sk2; |
4ad19de8 | 1576 | tcp_v6_restore_cb(skb); |
3b24d854 | 1577 | refcounted = false; |
1da177e4 LT |
1578 | goto process; |
1579 | } | |
1580 | /* Fall through to ACK */ | |
1581 | } | |
1582 | case TCP_TW_ACK: | |
1583 | tcp_v6_timewait_ack(sk, skb); | |
1584 | break; | |
1585 | case TCP_TW_RST: | |
4ad19de8 | 1586 | tcp_v6_restore_cb(skb); |
271c3b9b FW |
1587 | tcp_v6_send_reset(sk, skb); |
1588 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1589 | goto discard_it; | |
4aa956d8 WY |
1590 | case TCP_TW_SUCCESS: |
1591 | ; | |
1da177e4 LT |
1592 | } |
1593 | goto discard_it; | |
1594 | } | |
1595 | ||
c7109986 ED |
1596 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1597 | { | |
1598 | const struct ipv6hdr *hdr; | |
1599 | const struct tcphdr *th; | |
1600 | struct sock *sk; | |
1601 | ||
1602 | if (skb->pkt_type != PACKET_HOST) | |
1603 | return; | |
1604 | ||
1605 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1606 | return; | |
1607 | ||
1608 | hdr = ipv6_hdr(skb); | |
1609 | th = tcp_hdr(skb); | |
1610 | ||
1611 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1612 | return; | |
1613 | ||
870c3151 | 1614 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1615 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1616 | &hdr->saddr, th->source, | |
1617 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1618 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1619 | if (sk) { |
1620 | skb->sk = sk; | |
1621 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1622 | if (sk_fullsock(sk)) { |
d0c294c5 | 1623 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1624 | |
c7109986 | 1625 | if (dst) |
5d299f3d | 1626 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1627 | if (dst && |
f3f12135 | 1628 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1629 | skb_dst_set_noref(skb, dst); |
1630 | } | |
1631 | } | |
1632 | } | |
1633 | ||
ccb7c410 DM |
1634 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1635 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1636 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1637 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1638 | }; |
1639 | ||
3b401a81 | 1640 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1641 | .queue_xmit = inet6_csk_xmit, |
1642 | .send_check = tcp_v6_send_check, | |
1643 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1644 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1645 | .conn_request = tcp_v6_conn_request, |
1646 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1647 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1648 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1649 | .setsockopt = ipv6_setsockopt, |
1650 | .getsockopt = ipv6_getsockopt, | |
1651 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1652 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1653 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1654 | .compat_setsockopt = compat_ipv6_setsockopt, |
1655 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1656 | #endif |
4fab9071 | 1657 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1658 | }; |
1659 | ||
cfb6eeb4 | 1660 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1661 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1662 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1663 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1664 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1665 | }; |
a928630a | 1666 | #endif |
cfb6eeb4 | 1667 | |
1da177e4 LT |
1668 | /* |
1669 | * TCP over IPv4 via INET6 API | |
1670 | */ | |
3b401a81 | 1671 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1672 | .queue_xmit = ip_queue_xmit, |
1673 | .send_check = tcp_v4_send_check, | |
1674 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1675 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1676 | .conn_request = tcp_v6_conn_request, |
1677 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1678 | .net_header_len = sizeof(struct iphdr), |
1679 | .setsockopt = ipv6_setsockopt, | |
1680 | .getsockopt = ipv6_getsockopt, | |
1681 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1682 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1683 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1684 | .compat_setsockopt = compat_ipv6_setsockopt, |
1685 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1686 | #endif |
4fab9071 | 1687 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1688 | }; |
1689 | ||
cfb6eeb4 | 1690 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1691 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1692 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1693 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1694 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1695 | }; |
a928630a | 1696 | #endif |
cfb6eeb4 | 1697 | |
1da177e4 LT |
1698 | /* NOTE: A lot of things set to zero explicitly by call to |
1699 | * sk_alloc() so need not be done here. | |
1700 | */ | |
1701 | static int tcp_v6_init_sock(struct sock *sk) | |
1702 | { | |
6687e988 | 1703 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1704 | |
900f65d3 | 1705 | tcp_init_sock(sk); |
1da177e4 | 1706 | |
8292a17a | 1707 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1708 | |
cfb6eeb4 | 1709 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1710 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1711 | #endif |
1712 | ||
1da177e4 LT |
1713 | return 0; |
1714 | } | |
1715 | ||
7d06b2e0 | 1716 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1717 | { |
1da177e4 | 1718 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1719 | inet6_destroy_sock(sk); |
1da177e4 LT |
1720 | } |
1721 | ||
952a10be | 1722 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1723 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1724 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1725 | const struct request_sock *req, int i) |
1da177e4 | 1726 | { |
fa76ce73 | 1727 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1728 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1729 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1730 | |
1731 | if (ttd < 0) | |
1732 | ttd = 0; | |
1733 | ||
1da177e4 LT |
1734 | seq_printf(seq, |
1735 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1736 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1737 | i, |
1738 | src->s6_addr32[0], src->s6_addr32[1], | |
1739 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1740 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1741 | dest->s6_addr32[0], dest->s6_addr32[1], |
1742 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1743 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1744 | TCP_SYN_RECV, |
4c99aa40 | 1745 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1746 | 1, /* timers active (only the expire timer) */ |
1747 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1748 | req->num_timeout, |
aa3a0c8c ED |
1749 | from_kuid_munged(seq_user_ns(seq), |
1750 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1751 | 0, /* non standard timer */ |
1da177e4 LT |
1752 | 0, /* open_requests have no inode */ |
1753 | 0, req); | |
1754 | } | |
1755 | ||
1756 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1757 | { | |
b71d1d42 | 1758 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1759 | __u16 destp, srcp; |
1760 | int timer_active; | |
1761 | unsigned long timer_expires; | |
cf533ea5 ED |
1762 | const struct inet_sock *inet = inet_sk(sp); |
1763 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1764 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1765 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1766 | int rx_queue; |
1767 | int state; | |
1da177e4 | 1768 | |
efe4208f ED |
1769 | dest = &sp->sk_v6_daddr; |
1770 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1771 | destp = ntohs(inet->inet_dport); |
1772 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1773 | |
ce3cf4ec | 1774 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1775 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1776 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1777 | timer_active = 1; |
463c84b9 ACM |
1778 | timer_expires = icsk->icsk_timeout; |
1779 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1780 | timer_active = 4; |
463c84b9 | 1781 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1782 | } else if (timer_pending(&sp->sk_timer)) { |
1783 | timer_active = 2; | |
1784 | timer_expires = sp->sk_timer.expires; | |
1785 | } else { | |
1786 | timer_active = 0; | |
1787 | timer_expires = jiffies; | |
1788 | } | |
1789 | ||
00fd38d9 ED |
1790 | state = sk_state_load(sp); |
1791 | if (state == TCP_LISTEN) | |
1792 | rx_queue = sp->sk_ack_backlog; | |
1793 | else | |
1794 | /* Because we don't lock the socket, | |
1795 | * we might find a transient negative value. | |
1796 | */ | |
1797 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1798 | ||
1da177e4 LT |
1799 | seq_printf(seq, |
1800 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1801 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1802 | i, |
1803 | src->s6_addr32[0], src->s6_addr32[1], | |
1804 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1805 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1806 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1807 | state, |
1808 | tp->write_seq - tp->snd_una, | |
1809 | rx_queue, | |
1da177e4 | 1810 | timer_active, |
a399a805 | 1811 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1812 | icsk->icsk_retransmits, |
a7cb5a49 | 1813 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1814 | icsk->icsk_probes_out, |
1da177e4 | 1815 | sock_i_ino(sp), |
41c6d650 | 1816 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1817 | jiffies_to_clock_t(icsk->icsk_rto), |
1818 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1819 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1820 | tp->snd_cwnd, |
00fd38d9 | 1821 | state == TCP_LISTEN ? |
0536fcc0 | 1822 | fastopenq->max_qlen : |
0a672f74 | 1823 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1824 | ); |
1825 | } | |
1826 | ||
1ab1457c | 1827 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1828 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1829 | { |
789f558c | 1830 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1831 | const struct in6_addr *dest, *src; |
1da177e4 | 1832 | __u16 destp, srcp; |
1da177e4 | 1833 | |
efe4208f ED |
1834 | dest = &tw->tw_v6_daddr; |
1835 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1836 | destp = ntohs(tw->tw_dport); |
1837 | srcp = ntohs(tw->tw_sport); | |
1838 | ||
1839 | seq_printf(seq, | |
1840 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1841 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1842 | i, |
1843 | src->s6_addr32[0], src->s6_addr32[1], | |
1844 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1845 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1846 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1847 | tw->tw_substate, 0, 0, | |
a399a805 | 1848 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 1849 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
1850 | } |
1851 | ||
1da177e4 LT |
1852 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1853 | { | |
1854 | struct tcp_iter_state *st; | |
05dbc7b5 | 1855 | struct sock *sk = v; |
1da177e4 LT |
1856 | |
1857 | if (v == SEQ_START_TOKEN) { | |
1858 | seq_puts(seq, | |
1859 | " sl " | |
1860 | "local_address " | |
1861 | "remote_address " | |
1862 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1863 | " uid timeout inode\n"); | |
1864 | goto out; | |
1865 | } | |
1866 | st = seq->private; | |
1867 | ||
079096f1 ED |
1868 | if (sk->sk_state == TCP_TIME_WAIT) |
1869 | get_timewait6_sock(seq, v, st->num); | |
1870 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1871 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1872 | else |
1873 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1874 | out: |
1875 | return 0; | |
1876 | } | |
1877 | ||
73cb88ec AV |
1878 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1879 | .owner = THIS_MODULE, | |
1880 | .open = tcp_seq_open, | |
1881 | .read = seq_read, | |
1882 | .llseek = seq_lseek, | |
1883 | .release = seq_release_net | |
1884 | }; | |
1885 | ||
1da177e4 | 1886 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1887 | .name = "tcp6", |
1888 | .family = AF_INET6, | |
73cb88ec | 1889 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1890 | .seq_ops = { |
1891 | .show = tcp6_seq_show, | |
1892 | }, | |
1da177e4 LT |
1893 | }; |
1894 | ||
2c8c1e72 | 1895 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1896 | { |
6f8b13bc | 1897 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1898 | } |
1899 | ||
6f8b13bc | 1900 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1901 | { |
6f8b13bc | 1902 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1903 | } |
1904 | #endif | |
1905 | ||
1906 | struct proto tcpv6_prot = { | |
1907 | .name = "TCPv6", | |
1908 | .owner = THIS_MODULE, | |
1909 | .close = tcp_close, | |
1910 | .connect = tcp_v6_connect, | |
1911 | .disconnect = tcp_disconnect, | |
463c84b9 | 1912 | .accept = inet_csk_accept, |
1da177e4 LT |
1913 | .ioctl = tcp_ioctl, |
1914 | .init = tcp_v6_init_sock, | |
1915 | .destroy = tcp_v6_destroy_sock, | |
1916 | .shutdown = tcp_shutdown, | |
1917 | .setsockopt = tcp_setsockopt, | |
1918 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 1919 | .keepalive = tcp_set_keepalive, |
1da177e4 | 1920 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1921 | .sendmsg = tcp_sendmsg, |
1922 | .sendpage = tcp_sendpage, | |
1da177e4 | 1923 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1924 | .release_cb = tcp_release_cb, |
496611d7 | 1925 | .hash = inet6_hash, |
ab1e0a13 ACM |
1926 | .unhash = inet_unhash, |
1927 | .get_port = inet_csk_get_port, | |
1da177e4 | 1928 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 1929 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 1930 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1931 | .sockets_allocated = &tcp_sockets_allocated, |
1932 | .memory_allocated = &tcp_memory_allocated, | |
1933 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1934 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1935 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1936 | .sysctl_wmem = sysctl_tcp_wmem, |
1937 | .sysctl_rmem = sysctl_tcp_rmem, | |
1938 | .max_header = MAX_TCP_HEADER, | |
1939 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 1940 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 1941 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1942 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1943 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1944 | .no_autobind = true, |
543d9cfe ACM |
1945 | #ifdef CONFIG_COMPAT |
1946 | .compat_setsockopt = compat_tcp_setsockopt, | |
1947 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 1948 | #endif |
c1e64e29 | 1949 | .diag_destroy = tcp_abort, |
1da177e4 LT |
1950 | }; |
1951 | ||
a8e3bb34 DA |
1952 | /* thinking of making this const? Don't. |
1953 | * early_demux can change based on sysctl. | |
1954 | */ | |
39294c3d | 1955 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1956 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 1957 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
1958 | .handler = tcp_v6_rcv, |
1959 | .err_handler = tcp_v6_err, | |
1960 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1961 | }; | |
1962 | ||
1da177e4 LT |
1963 | static struct inet_protosw tcpv6_protosw = { |
1964 | .type = SOCK_STREAM, | |
1965 | .protocol = IPPROTO_TCP, | |
1966 | .prot = &tcpv6_prot, | |
1967 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1968 | .flags = INET_PROTOSW_PERMANENT | |
1969 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1970 | }; |
1971 | ||
2c8c1e72 | 1972 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1973 | { |
5677242f DL |
1974 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1975 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1976 | } |
1977 | ||
2c8c1e72 | 1978 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1979 | { |
5677242f | 1980 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1981 | } |
1982 | ||
2c8c1e72 | 1983 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 1984 | { |
1946e672 | 1985 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
1986 | } |
1987 | ||
1988 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1989 | .init = tcpv6_net_init, |
1990 | .exit = tcpv6_net_exit, | |
1991 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1992 | }; |
1993 | ||
7f4e4868 | 1994 | int __init tcpv6_init(void) |
1da177e4 | 1995 | { |
7f4e4868 DL |
1996 | int ret; |
1997 | ||
3336288a VY |
1998 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1999 | if (ret) | |
c6b641a4 | 2000 | goto out; |
3336288a | 2001 | |
1da177e4 | 2002 | /* register inet6 protocol */ |
7f4e4868 DL |
2003 | ret = inet6_register_protosw(&tcpv6_protosw); |
2004 | if (ret) | |
2005 | goto out_tcpv6_protocol; | |
2006 | ||
93ec926b | 2007 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2008 | if (ret) |
2009 | goto out_tcpv6_protosw; | |
2010 | out: | |
2011 | return ret; | |
ae0f7d5f | 2012 | |
7f4e4868 DL |
2013 | out_tcpv6_protosw: |
2014 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2015 | out_tcpv6_protocol: |
2016 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2017 | goto out; |
2018 | } | |
2019 | ||
09f7709f | 2020 | void tcpv6_exit(void) |
7f4e4868 | 2021 | { |
93ec926b | 2022 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2023 | inet6_unregister_protosw(&tcpv6_protosw); |
2024 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2025 | } |