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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 | ||
d74bad4e AI |
120 | static int tcp_v6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
121 | int addr_len) | |
122 | { | |
123 | /* This check is replicated from tcp_v6_connect() and intended to | |
124 | * prevent BPF program called below from accessing bytes that are out | |
125 | * of the bound specified by user in addr_len. | |
126 | */ | |
127 | if (addr_len < SIN6_LEN_RFC2133) | |
128 | return -EINVAL; | |
129 | ||
130 | sock_owned_by_me(sk); | |
131 | ||
132 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT(sk, uaddr); | |
133 | } | |
134 | ||
1ab1457c | 135 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
136 | int addr_len) |
137 | { | |
138 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 139 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 140 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
141 | struct ipv6_pinfo *np = inet6_sk(sk); |
142 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 143 | struct in6_addr *saddr = NULL, *final_p, final; |
45f6fad8 | 144 | struct ipv6_txoptions *opt; |
4c9483b2 | 145 | struct flowi6 fl6; |
1da177e4 LT |
146 | struct dst_entry *dst; |
147 | int addr_type; | |
148 | int err; | |
1946e672 | 149 | struct inet_timewait_death_row *tcp_death_row = &sock_net(sk)->ipv4.tcp_death_row; |
1da177e4 | 150 | |
1ab1457c | 151 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
152 | return -EINVAL; |
153 | ||
1ab1457c | 154 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 155 | return -EAFNOSUPPORT; |
1da177e4 | 156 | |
4c9483b2 | 157 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
158 | |
159 | if (np->sndflow) { | |
4c9483b2 DM |
160 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
161 | IP6_ECN_flow_init(fl6.flowlabel); | |
162 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 163 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 164 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 165 | if (!flowlabel) |
1da177e4 | 166 | return -EINVAL; |
1da177e4 LT |
167 | fl6_sock_release(flowlabel); |
168 | } | |
169 | } | |
170 | ||
171 | /* | |
1ab1457c YH |
172 | * connect() to INADDR_ANY means loopback (BSD'ism). |
173 | */ | |
174 | ||
052d2369 JL |
175 | if (ipv6_addr_any(&usin->sin6_addr)) { |
176 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) | |
177 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
178 | &usin->sin6_addr); | |
179 | else | |
180 | usin->sin6_addr = in6addr_loopback; | |
181 | } | |
1da177e4 LT |
182 | |
183 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
184 | ||
4c99aa40 | 185 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
186 | return -ENETUNREACH; |
187 | ||
188 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
189 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
190 | usin->sin6_scope_id) { | |
191 | /* If interface is set while binding, indices | |
192 | * must coincide. | |
193 | */ | |
54dc3e33 | 194 | if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) |
1da177e4 LT |
195 | return -EINVAL; |
196 | ||
197 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
198 | } | |
199 | ||
200 | /* Connect to link-local address requires an interface */ | |
201 | if (!sk->sk_bound_dev_if) | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 206 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
207 | tp->rx_opt.ts_recent = 0; |
208 | tp->rx_opt.ts_recent_stamp = 0; | |
209 | tp->write_seq = 0; | |
210 | } | |
211 | ||
efe4208f | 212 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 213 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
214 | |
215 | /* | |
216 | * TCP over IPv4 | |
217 | */ | |
218 | ||
052d2369 | 219 | if (addr_type & IPV6_ADDR_MAPPED) { |
d83d8461 | 220 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
221 | struct sockaddr_in sin; |
222 | ||
223 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
224 | ||
225 | if (__ipv6_only_sock(sk)) | |
226 | return -ENETUNREACH; | |
227 | ||
228 | sin.sin_family = AF_INET; | |
229 | sin.sin_port = usin->sin6_port; | |
230 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
231 | ||
d83d8461 | 232 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 233 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
234 | #ifdef CONFIG_TCP_MD5SIG |
235 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
236 | #endif | |
1da177e4 LT |
237 | |
238 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
239 | ||
240 | if (err) { | |
d83d8461 ACM |
241 | icsk->icsk_ext_hdr_len = exthdrlen; |
242 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 243 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
244 | #ifdef CONFIG_TCP_MD5SIG |
245 | tp->af_specific = &tcp_sock_ipv6_specific; | |
246 | #endif | |
1da177e4 | 247 | goto failure; |
1da177e4 | 248 | } |
d1e559d0 | 249 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
250 | |
251 | return err; | |
252 | } | |
253 | ||
efe4208f ED |
254 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
255 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 256 | |
4c9483b2 | 257 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 258 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 259 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
260 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
261 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
262 | fl6.fl6_dport = usin->sin6_port; |
263 | fl6.fl6_sport = inet->inet_sport; | |
e2d118a1 | 264 | fl6.flowi6_uid = sk->sk_uid; |
1da177e4 | 265 | |
1e1d04e6 | 266 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
45f6fad8 | 267 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 268 | |
4c9483b2 | 269 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 270 | |
0e0d44ab | 271 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
272 | if (IS_ERR(dst)) { |
273 | err = PTR_ERR(dst); | |
1da177e4 | 274 | goto failure; |
14e50e57 | 275 | } |
1da177e4 | 276 | |
63159f29 | 277 | if (!saddr) { |
4c9483b2 | 278 | saddr = &fl6.saddr; |
efe4208f | 279 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
280 | } |
281 | ||
282 | /* set the source address */ | |
4e3fd7a0 | 283 | np->saddr = *saddr; |
c720c7e8 | 284 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 285 | |
f83ef8c0 | 286 | sk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 287 | ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 288 | |
d83d8461 | 289 | icsk->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
290 | if (opt) |
291 | icsk->icsk_ext_hdr_len = opt->opt_flen + | |
292 | opt->opt_nflen; | |
1da177e4 LT |
293 | |
294 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
295 | ||
c720c7e8 | 296 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
297 | |
298 | tcp_set_state(sk, TCP_SYN_SENT); | |
1946e672 | 299 | err = inet6_hash_connect(tcp_death_row, sk); |
1da177e4 LT |
300 | if (err) |
301 | goto late_failure; | |
302 | ||
877d1f62 | 303 | sk_set_txhash(sk); |
9e7ceb06 | 304 | |
00355fa5 | 305 | if (likely(!tp->repair)) { |
00355fa5 | 306 | if (!tp->write_seq) |
84b114b9 ED |
307 | tp->write_seq = secure_tcpv6_seq(np->saddr.s6_addr32, |
308 | sk->sk_v6_daddr.s6_addr32, | |
309 | inet->inet_sport, | |
310 | inet->inet_dport); | |
5d2ed052 ED |
311 | tp->tsoffset = secure_tcpv6_ts_off(sock_net(sk), |
312 | np->saddr.s6_addr32, | |
84b114b9 | 313 | sk->sk_v6_daddr.s6_addr32); |
00355fa5 | 314 | } |
1da177e4 | 315 | |
19f6d3f3 WW |
316 | if (tcp_fastopen_defer_connect(sk, &err)) |
317 | return err; | |
318 | if (err) | |
319 | goto late_failure; | |
320 | ||
1da177e4 LT |
321 | err = tcp_connect(sk); |
322 | if (err) | |
323 | goto late_failure; | |
324 | ||
325 | return 0; | |
326 | ||
327 | late_failure: | |
328 | tcp_set_state(sk, TCP_CLOSE); | |
1da177e4 | 329 | failure: |
c720c7e8 | 330 | inet->inet_dport = 0; |
1da177e4 LT |
331 | sk->sk_route_caps = 0; |
332 | return err; | |
333 | } | |
334 | ||
563d34d0 ED |
335 | static void tcp_v6_mtu_reduced(struct sock *sk) |
336 | { | |
337 | struct dst_entry *dst; | |
338 | ||
339 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
340 | return; | |
341 | ||
342 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
343 | if (!dst) | |
344 | return; | |
345 | ||
346 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
347 | tcp_sync_mss(sk, dst_mtu(dst)); | |
348 | tcp_simple_retransmit(sk); | |
349 | } | |
350 | } | |
351 | ||
32bbd879 | 352 | static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 353 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 354 | { |
4c99aa40 | 355 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 356 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
357 | struct net *net = dev_net(skb->dev); |
358 | struct request_sock *fastopen; | |
1da177e4 | 359 | struct ipv6_pinfo *np; |
1ab1457c | 360 | struct tcp_sock *tp; |
0a672f74 | 361 | __u32 seq, snd_una; |
2215089b | 362 | struct sock *sk; |
9cf74903 | 363 | bool fatal; |
2215089b | 364 | int err; |
1da177e4 | 365 | |
2215089b ED |
366 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
367 | &hdr->daddr, th->dest, | |
368 | &hdr->saddr, ntohs(th->source), | |
4297a0ef | 369 | skb->dev->ifindex, inet6_sdif(skb)); |
1da177e4 | 370 | |
2215089b | 371 | if (!sk) { |
a16292a0 ED |
372 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
373 | ICMP6_MIB_INERRORS); | |
32bbd879 | 374 | return -ENOENT; |
1da177e4 LT |
375 | } |
376 | ||
377 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 378 | inet_twsk_put(inet_twsk(sk)); |
32bbd879 | 379 | return 0; |
1da177e4 | 380 | } |
2215089b | 381 | seq = ntohl(th->seq); |
9cf74903 | 382 | fatal = icmpv6_err_convert(type, code, &err); |
32bbd879 SB |
383 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
384 | tcp_req_err(sk, seq, fatal); | |
385 | return 0; | |
386 | } | |
1da177e4 LT |
387 | |
388 | bh_lock_sock(sk); | |
563d34d0 | 389 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
02a1d6e7 | 390 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
391 | |
392 | if (sk->sk_state == TCP_CLOSE) | |
393 | goto out; | |
394 | ||
e802af9c | 395 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 396 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
397 | goto out; |
398 | } | |
399 | ||
1da177e4 | 400 | tp = tcp_sk(sk); |
0a672f74 YC |
401 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
402 | fastopen = tp->fastopen_rsk; | |
403 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 404 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 405 | !between(seq, snd_una, tp->snd_nxt)) { |
02a1d6e7 | 406 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
407 | goto out; |
408 | } | |
409 | ||
410 | np = inet6_sk(sk); | |
411 | ||
ec18d9a2 | 412 | if (type == NDISC_REDIRECT) { |
45caeaa5 JM |
413 | if (!sock_owned_by_user(sk)) { |
414 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
ec18d9a2 | 415 | |
45caeaa5 JM |
416 | if (dst) |
417 | dst->ops->redirect(dst, sk, skb); | |
418 | } | |
50a75a89 | 419 | goto out; |
ec18d9a2 DM |
420 | } |
421 | ||
1da177e4 | 422 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
423 | /* We are not interested in TCP_LISTEN and open_requests |
424 | * (SYN-ACKs send out by Linux are always <576bytes so | |
425 | * they should go through unfragmented). | |
426 | */ | |
427 | if (sk->sk_state == TCP_LISTEN) | |
428 | goto out; | |
429 | ||
93b36cf3 HFS |
430 | if (!ip6_sk_accept_pmtu(sk)) |
431 | goto out; | |
432 | ||
563d34d0 ED |
433 | tp->mtu_info = ntohl(info); |
434 | if (!sock_owned_by_user(sk)) | |
435 | tcp_v6_mtu_reduced(sk); | |
d013ef2a | 436 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
7aa5470c | 437 | &sk->sk_tsq_flags)) |
d013ef2a | 438 | sock_hold(sk); |
1da177e4 LT |
439 | goto out; |
440 | } | |
441 | ||
1da177e4 | 442 | |
60236fdd | 443 | /* Might be for an request_sock */ |
1da177e4 | 444 | switch (sk->sk_state) { |
1da177e4 | 445 | case TCP_SYN_SENT: |
0a672f74 YC |
446 | case TCP_SYN_RECV: |
447 | /* Only in fast or simultaneous open. If a fast open socket is | |
448 | * is already accepted it is treated as a connected one below. | |
449 | */ | |
63159f29 | 450 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
451 | break; |
452 | ||
1da177e4 | 453 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
454 | sk->sk_err = err; |
455 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
456 | ||
457 | tcp_done(sk); | |
458 | } else | |
459 | sk->sk_err_soft = err; | |
460 | goto out; | |
461 | } | |
462 | ||
463 | if (!sock_owned_by_user(sk) && np->recverr) { | |
464 | sk->sk_err = err; | |
465 | sk->sk_error_report(sk); | |
466 | } else | |
467 | sk->sk_err_soft = err; | |
468 | ||
469 | out: | |
470 | bh_unlock_sock(sk); | |
471 | sock_put(sk); | |
32bbd879 | 472 | return 0; |
1da177e4 LT |
473 | } |
474 | ||
475 | ||
0f935dbe | 476 | static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 477 | struct flowi *fl, |
3840a06e | 478 | struct request_sock *req, |
ca6fb065 | 479 | struct tcp_fastopen_cookie *foc, |
b3d05147 | 480 | enum tcp_synack_type synack_type) |
1da177e4 | 481 | { |
634fb979 | 482 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 483 | struct ipv6_pinfo *np = inet6_sk(sk); |
56ac42bc | 484 | struct ipv6_txoptions *opt; |
d6274bd8 | 485 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 486 | struct sk_buff *skb; |
9494218f | 487 | int err = -ENOMEM; |
1da177e4 | 488 | |
9f10d3f6 | 489 | /* First, grab a route. */ |
f76b33c3 ED |
490 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req, |
491 | IPPROTO_TCP)) == NULL) | |
fd80eb94 | 492 | goto done; |
9494218f | 493 | |
b3d05147 | 494 | skb = tcp_make_synack(sk, dst, req, foc, synack_type); |
9494218f | 495 | |
1da177e4 | 496 | if (skb) { |
634fb979 ED |
497 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
498 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 499 | |
634fb979 | 500 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 501 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
502 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
503 | ||
3e4006f0 | 504 | rcu_read_lock(); |
56ac42bc HD |
505 | opt = ireq->ipv6_opt; |
506 | if (!opt) | |
507 | opt = rcu_dereference(np->opt); | |
92e55f41 | 508 | err = ip6_xmit(sk, skb, fl6, sk->sk_mark, opt, np->tclass); |
3e4006f0 | 509 | rcu_read_unlock(); |
b9df3cb8 | 510 | err = net_xmit_eval(err); |
1da177e4 LT |
511 | } |
512 | ||
513 | done: | |
1da177e4 LT |
514 | return err; |
515 | } | |
516 | ||
72659ecc | 517 | |
60236fdd | 518 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 519 | { |
56ac42bc | 520 | kfree(inet_rsk(req)->ipv6_opt); |
634fb979 | 521 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
522 | } |
523 | ||
cfb6eeb4 | 524 | #ifdef CONFIG_TCP_MD5SIG |
b83e3deb | 525 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk, |
b71d1d42 | 526 | const struct in6_addr *addr) |
cfb6eeb4 | 527 | { |
a915da9b | 528 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
529 | } |
530 | ||
b83e3deb | 531 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk, |
fd3a154a | 532 | const struct sock *addr_sk) |
cfb6eeb4 | 533 | { |
efe4208f | 534 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
535 | } |
536 | ||
8917a777 ID |
537 | static int tcp_v6_parse_md5_keys(struct sock *sk, int optname, |
538 | char __user *optval, int optlen) | |
cfb6eeb4 YH |
539 | { |
540 | struct tcp_md5sig cmd; | |
541 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
8917a777 | 542 | u8 prefixlen; |
cfb6eeb4 YH |
543 | |
544 | if (optlen < sizeof(cmd)) | |
545 | return -EINVAL; | |
546 | ||
547 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
548 | return -EFAULT; | |
549 | ||
550 | if (sin6->sin6_family != AF_INET6) | |
551 | return -EINVAL; | |
552 | ||
8917a777 ID |
553 | if (optname == TCP_MD5SIG_EXT && |
554 | cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) { | |
555 | prefixlen = cmd.tcpm_prefixlen; | |
556 | if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) && | |
557 | prefixlen > 32)) | |
558 | return -EINVAL; | |
559 | } else { | |
560 | prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128; | |
561 | } | |
562 | ||
cfb6eeb4 | 563 | if (!cmd.tcpm_keylen) { |
e773e4fa | 564 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b | 565 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
8917a777 | 566 | AF_INET, prefixlen); |
a915da9b | 567 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 | 568 | AF_INET6, prefixlen); |
cfb6eeb4 YH |
569 | } |
570 | ||
571 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
572 | return -EINVAL; | |
573 | ||
a915da9b ED |
574 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
575 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
8917a777 | 576 | AF_INET, prefixlen, cmd.tcpm_key, |
6797318e | 577 | cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 | 578 | |
a915da9b | 579 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
8917a777 ID |
580 | AF_INET6, prefixlen, cmd.tcpm_key, |
581 | cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
582 | } |
583 | ||
19689e38 ED |
584 | static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp, |
585 | const struct in6_addr *daddr, | |
586 | const struct in6_addr *saddr, | |
587 | const struct tcphdr *th, int nbytes) | |
cfb6eeb4 | 588 | { |
cfb6eeb4 | 589 | struct tcp6_pseudohdr *bp; |
49a72dfb | 590 | struct scatterlist sg; |
19689e38 | 591 | struct tcphdr *_th; |
8d26d76d | 592 | |
19689e38 | 593 | bp = hp->scratch; |
cfb6eeb4 | 594 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
595 | bp->saddr = *saddr; |
596 | bp->daddr = *daddr; | |
49a72dfb | 597 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 598 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 599 | |
19689e38 ED |
600 | _th = (struct tcphdr *)(bp + 1); |
601 | memcpy(_th, th, sizeof(*th)); | |
602 | _th->check = 0; | |
603 | ||
604 | sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th)); | |
605 | ahash_request_set_crypt(hp->md5_req, &sg, NULL, | |
606 | sizeof(*bp) + sizeof(*th)); | |
cf80e0e4 | 607 | return crypto_ahash_update(hp->md5_req); |
49a72dfb | 608 | } |
c7da57a1 | 609 | |
19689e38 | 610 | static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
b71d1d42 | 611 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 612 | const struct tcphdr *th) |
49a72dfb AL |
613 | { |
614 | struct tcp_md5sig_pool *hp; | |
cf80e0e4 | 615 | struct ahash_request *req; |
49a72dfb AL |
616 | |
617 | hp = tcp_get_md5sig_pool(); | |
618 | if (!hp) | |
619 | goto clear_hash_noput; | |
cf80e0e4 | 620 | req = hp->md5_req; |
49a72dfb | 621 | |
cf80e0e4 | 622 | if (crypto_ahash_init(req)) |
49a72dfb | 623 | goto clear_hash; |
19689e38 | 624 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2)) |
49a72dfb AL |
625 | goto clear_hash; |
626 | if (tcp_md5_hash_key(hp, key)) | |
627 | goto clear_hash; | |
cf80e0e4 HX |
628 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
629 | if (crypto_ahash_final(req)) | |
cfb6eeb4 | 630 | goto clear_hash; |
cfb6eeb4 | 631 | |
cfb6eeb4 | 632 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 633 | return 0; |
49a72dfb | 634 | |
cfb6eeb4 YH |
635 | clear_hash: |
636 | tcp_put_md5sig_pool(); | |
637 | clear_hash_noput: | |
638 | memset(md5_hash, 0, 16); | |
49a72dfb | 639 | return 1; |
cfb6eeb4 YH |
640 | } |
641 | ||
39f8e58e ED |
642 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
643 | const struct tcp_md5sig_key *key, | |
318cf7aa | 644 | const struct sock *sk, |
318cf7aa | 645 | const struct sk_buff *skb) |
cfb6eeb4 | 646 | { |
b71d1d42 | 647 | const struct in6_addr *saddr, *daddr; |
49a72dfb | 648 | struct tcp_md5sig_pool *hp; |
cf80e0e4 | 649 | struct ahash_request *req; |
318cf7aa | 650 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 651 | |
39f8e58e ED |
652 | if (sk) { /* valid for establish/request sockets */ |
653 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 654 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 655 | } else { |
b71d1d42 | 656 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
657 | saddr = &ip6h->saddr; |
658 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 659 | } |
49a72dfb AL |
660 | |
661 | hp = tcp_get_md5sig_pool(); | |
662 | if (!hp) | |
663 | goto clear_hash_noput; | |
cf80e0e4 | 664 | req = hp->md5_req; |
49a72dfb | 665 | |
cf80e0e4 | 666 | if (crypto_ahash_init(req)) |
49a72dfb AL |
667 | goto clear_hash; |
668 | ||
19689e38 | 669 | if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len)) |
49a72dfb AL |
670 | goto clear_hash; |
671 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
672 | goto clear_hash; | |
673 | if (tcp_md5_hash_key(hp, key)) | |
674 | goto clear_hash; | |
cf80e0e4 HX |
675 | ahash_request_set_crypt(req, NULL, md5_hash, 0); |
676 | if (crypto_ahash_final(req)) | |
49a72dfb AL |
677 | goto clear_hash; |
678 | ||
679 | tcp_put_md5sig_pool(); | |
680 | return 0; | |
681 | ||
682 | clear_hash: | |
683 | tcp_put_md5sig_pool(); | |
684 | clear_hash_noput: | |
685 | memset(md5_hash, 0, 16); | |
686 | return 1; | |
cfb6eeb4 YH |
687 | } |
688 | ||
ba8e275a ED |
689 | #endif |
690 | ||
691 | static bool tcp_v6_inbound_md5_hash(const struct sock *sk, | |
692 | const struct sk_buff *skb) | |
cfb6eeb4 | 693 | { |
ba8e275a | 694 | #ifdef CONFIG_TCP_MD5SIG |
cf533ea5 | 695 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 696 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 697 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 698 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 699 | int genhash; |
cfb6eeb4 YH |
700 | u8 newhash[16]; |
701 | ||
702 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 703 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 704 | |
785957d3 DM |
705 | /* We've parsed the options - do we have a hash? */ |
706 | if (!hash_expected && !hash_location) | |
ff74e23f | 707 | return false; |
785957d3 DM |
708 | |
709 | if (hash_expected && !hash_location) { | |
c10d9310 | 710 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
ff74e23f | 711 | return true; |
cfb6eeb4 YH |
712 | } |
713 | ||
785957d3 | 714 | if (!hash_expected && hash_location) { |
c10d9310 | 715 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
ff74e23f | 716 | return true; |
cfb6eeb4 YH |
717 | } |
718 | ||
719 | /* check the signature */ | |
49a72dfb AL |
720 | genhash = tcp_v6_md5_hash_skb(newhash, |
721 | hash_expected, | |
39f8e58e | 722 | NULL, skb); |
49a72dfb | 723 | |
cfb6eeb4 | 724 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
72145a68 | 725 | NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE); |
e87cc472 JP |
726 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
727 | genhash ? "failed" : "mismatch", | |
728 | &ip6h->saddr, ntohs(th->source), | |
729 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 730 | return true; |
cfb6eeb4 | 731 | } |
ba8e275a | 732 | #endif |
ff74e23f | 733 | return false; |
cfb6eeb4 | 734 | } |
cfb6eeb4 | 735 | |
b40cf18e ED |
736 | static void tcp_v6_init_req(struct request_sock *req, |
737 | const struct sock *sk_listener, | |
16bea70a OP |
738 | struct sk_buff *skb) |
739 | { | |
740 | struct inet_request_sock *ireq = inet_rsk(req); | |
b40cf18e | 741 | const struct ipv6_pinfo *np = inet6_sk(sk_listener); |
16bea70a OP |
742 | |
743 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
744 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
745 | ||
16bea70a | 746 | /* So that link locals have meaning */ |
b40cf18e | 747 | if (!sk_listener->sk_bound_dev_if && |
16bea70a | 748 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
870c3151 | 749 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 750 | |
04317daf | 751 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
b40cf18e | 752 | (ipv6_opt_accepted(sk_listener, skb, &TCP_SKB_CB(skb)->header.h6) || |
a224772d | 753 | np->rxopt.bits.rxinfo || |
16bea70a OP |
754 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
755 | np->rxopt.bits.rxohlim || np->repflow)) { | |
63354797 | 756 | refcount_inc(&skb->users); |
16bea70a OP |
757 | ireq->pktopts = skb; |
758 | } | |
759 | } | |
760 | ||
f964629e ED |
761 | static struct dst_entry *tcp_v6_route_req(const struct sock *sk, |
762 | struct flowi *fl, | |
4396e461 | 763 | const struct request_sock *req) |
d94e0417 | 764 | { |
f76b33c3 | 765 | return inet6_csk_route_req(sk, &fl->u.ip6, req, IPPROTO_TCP); |
d94e0417 OP |
766 | } |
767 | ||
c6aefafb | 768 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 769 | .family = AF_INET6, |
2e6599cb | 770 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 771 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
772 | .send_ack = tcp_v6_reqsk_send_ack, |
773 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 774 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 775 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
776 | }; |
777 | ||
b2e4b3de | 778 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
779 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
780 | sizeof(struct ipv6hdr), | |
16bea70a | 781 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 782 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 783 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 784 | #endif |
16bea70a | 785 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
786 | #ifdef CONFIG_SYN_COOKIES |
787 | .cookie_init_seq = cookie_v6_init_sequence, | |
788 | #endif | |
d94e0417 | 789 | .route_req = tcp_v6_route_req, |
84b114b9 ED |
790 | .init_seq = tcp_v6_init_seq, |
791 | .init_ts_off = tcp_v6_init_ts_off, | |
d6274bd8 | 792 | .send_synack = tcp_v6_send_synack, |
16bea70a | 793 | }; |
cfb6eeb4 | 794 | |
a00e7444 | 795 | static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae ED |
796 | u32 ack, u32 win, u32 tsval, u32 tsecr, |
797 | int oif, struct tcp_md5sig_key *key, int rst, | |
5119bd16 | 798 | u8 tclass, __be32 label) |
1da177e4 | 799 | { |
cf533ea5 ED |
800 | const struct tcphdr *th = tcp_hdr(skb); |
801 | struct tcphdr *t1; | |
1da177e4 | 802 | struct sk_buff *buff; |
4c9483b2 | 803 | struct flowi6 fl6; |
0f85feae | 804 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 805 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 806 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 807 | struct dst_entry *dst; |
81ada62d | 808 | __be32 *topt; |
00483690 | 809 | __u32 mark = 0; |
1da177e4 | 810 | |
ee684b6f | 811 | if (tsecr) |
626e264d | 812 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 813 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
814 | if (key) |
815 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
816 | #endif | |
817 | ||
cfb6eeb4 | 818 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 819 | GFP_ATOMIC); |
63159f29 | 820 | if (!buff) |
1ab1457c | 821 | return; |
1da177e4 | 822 | |
cfb6eeb4 | 823 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 824 | |
d58ff351 | 825 | t1 = skb_push(buff, tot_len); |
6651ffc8 | 826 | skb_reset_transport_header(buff); |
1da177e4 LT |
827 | |
828 | /* Swap the send and the receive. */ | |
829 | memset(t1, 0, sizeof(*t1)); | |
830 | t1->dest = th->source; | |
831 | t1->source = th->dest; | |
cfb6eeb4 | 832 | t1->doff = tot_len / 4; |
626e264d IJ |
833 | t1->seq = htonl(seq); |
834 | t1->ack_seq = htonl(ack); | |
835 | t1->ack = !rst || !th->ack; | |
836 | t1->rst = rst; | |
837 | t1->window = htons(win); | |
1da177e4 | 838 | |
81ada62d IJ |
839 | topt = (__be32 *)(t1 + 1); |
840 | ||
ee684b6f | 841 | if (tsecr) { |
626e264d IJ |
842 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
843 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
844 | *topt++ = htonl(tsval); |
845 | *topt++ = htonl(tsecr); | |
626e264d IJ |
846 | } |
847 | ||
cfb6eeb4 YH |
848 | #ifdef CONFIG_TCP_MD5SIG |
849 | if (key) { | |
81ada62d IJ |
850 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
851 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
852 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
853 | &ipv6_hdr(skb)->saddr, |
854 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
855 | } |
856 | #endif | |
857 | ||
4c9483b2 | 858 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
859 | fl6.daddr = ipv6_hdr(skb)->saddr; |
860 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 861 | fl6.flowlabel = label; |
1da177e4 | 862 | |
e5700aff DM |
863 | buff->ip_summed = CHECKSUM_PARTIAL; |
864 | buff->csum = 0; | |
865 | ||
4c9483b2 | 866 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 867 | |
4c9483b2 | 868 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 869 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 870 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9b6c14d5 DA |
871 | else { |
872 | if (!oif && netif_index_is_l3_master(net, skb->skb_iif)) | |
873 | oif = skb->skb_iif; | |
874 | ||
875 | fl6.flowi6_oif = oif; | |
876 | } | |
1d2f7b2d | 877 | |
00483690 JM |
878 | if (sk) |
879 | mark = (sk->sk_state == TCP_TIME_WAIT) ? | |
880 | inet_twsk(sk)->tw_mark : sk->sk_mark; | |
881 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark) ?: mark; | |
1958b856 DM |
882 | fl6.fl6_dport = t1->dest; |
883 | fl6.fl6_sport = t1->source; | |
e2d118a1 | 884 | fl6.flowi6_uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL); |
4c9483b2 | 885 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 886 | |
c20121ae DL |
887 | /* Pass a socket to ip6_dst_lookup either it is for RST |
888 | * Underlying function will use this to retrieve the network | |
889 | * namespace | |
890 | */ | |
0e0d44ab | 891 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
892 | if (!IS_ERR(dst)) { |
893 | skb_dst_set(buff, dst); | |
92e55f41 | 894 | ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL, tclass); |
c10d9310 | 895 | TCP_INC_STATS(net, TCP_MIB_OUTSEGS); |
68d0c6d3 | 896 | if (rst) |
c10d9310 | 897 | TCP_INC_STATS(net, TCP_MIB_OUTRSTS); |
68d0c6d3 | 898 | return; |
1da177e4 LT |
899 | } |
900 | ||
901 | kfree_skb(buff); | |
902 | } | |
903 | ||
a00e7444 | 904 | static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) |
1da177e4 | 905 | { |
cf533ea5 | 906 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 907 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 908 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
909 | #ifdef CONFIG_TCP_MD5SIG |
910 | const __u8 *hash_location = NULL; | |
911 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
912 | unsigned char newhash[16]; | |
913 | int genhash; | |
914 | struct sock *sk1 = NULL; | |
915 | #endif | |
c24b14c4 | 916 | int oif = 0; |
1da177e4 | 917 | |
626e264d | 918 | if (th->rst) |
1da177e4 LT |
919 | return; |
920 | ||
c3658e8d ED |
921 | /* If sk not NULL, it means we did a successful lookup and incoming |
922 | * route had to be correct. prequeue might have dropped our dst. | |
923 | */ | |
924 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 925 | return; |
1da177e4 | 926 | |
cfb6eeb4 | 927 | #ifdef CONFIG_TCP_MD5SIG |
3b24d854 | 928 | rcu_read_lock(); |
658ddaaf | 929 | hash_location = tcp_parse_md5sig_option(th); |
271c3b9b | 930 | if (sk && sk_fullsock(sk)) { |
e46787f0 FW |
931 | key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr); |
932 | } else if (hash_location) { | |
658ddaaf SL |
933 | /* |
934 | * active side is lost. Try to find listening socket through | |
935 | * source port, and then find md5 key through listening socket. | |
936 | * we are not loose security here: | |
937 | * Incoming packet is checked with md5 hash with finding key, | |
938 | * no RST generated if md5 hash doesn't match. | |
939 | */ | |
940 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
a583636a CG |
941 | &tcp_hashinfo, NULL, 0, |
942 | &ipv6h->saddr, | |
5ba24953 | 943 | th->source, &ipv6h->daddr, |
24b711ed DA |
944 | ntohs(th->source), |
945 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 946 | tcp_v6_sdif(skb)); |
658ddaaf | 947 | if (!sk1) |
3b24d854 | 948 | goto out; |
658ddaaf | 949 | |
658ddaaf SL |
950 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); |
951 | if (!key) | |
3b24d854 | 952 | goto out; |
658ddaaf | 953 | |
39f8e58e | 954 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf | 955 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
3b24d854 | 956 | goto out; |
658ddaaf | 957 | } |
cfb6eeb4 YH |
958 | #endif |
959 | ||
626e264d IJ |
960 | if (th->ack) |
961 | seq = ntohl(th->ack_seq); | |
962 | else | |
963 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
964 | (th->doff << 2); | |
1da177e4 | 965 | |
c24b14c4 SL |
966 | if (sk) { |
967 | oif = sk->sk_bound_dev_if; | |
5c487bb9 SL |
968 | if (sk_fullsock(sk)) |
969 | trace_tcp_send_reset(sk, skb); | |
c24b14c4 SL |
970 | } |
971 | ||
0f85feae | 972 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
973 | |
974 | #ifdef CONFIG_TCP_MD5SIG | |
3b24d854 ED |
975 | out: |
976 | rcu_read_unlock(); | |
658ddaaf | 977 | #endif |
626e264d | 978 | } |
1da177e4 | 979 | |
a00e7444 | 980 | static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq, |
0f85feae | 981 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c | 982 | struct tcp_md5sig_key *key, u8 tclass, |
5119bd16 | 983 | __be32 label) |
626e264d | 984 | { |
0f85feae ED |
985 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
986 | tclass, label); | |
1da177e4 LT |
987 | } |
988 | ||
989 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
990 | { | |
8feaf0c0 | 991 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 992 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 993 | |
0f85feae | 994 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 995 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9a568de4 | 996 | tcp_time_stamp_raw() + tcptw->tw_ts_offset, |
9c76a114 | 997 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 998 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 999 | |
8feaf0c0 | 1000 | inet_twsk_put(tw); |
1da177e4 LT |
1001 | } |
1002 | ||
a00e7444 | 1003 | static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
6edafaaf | 1004 | struct request_sock *req) |
1da177e4 | 1005 | { |
3a19ce0e DL |
1006 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
1007 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
1008 | */ | |
20a2b49f ED |
1009 | /* RFC 7323 2.3 |
1010 | * The window field (SEG.WND) of every outgoing segment, with the | |
1011 | * exception of <SYN> segments, MUST be right-shifted by | |
1012 | * Rcv.Wind.Shift bits: | |
1013 | */ | |
0f85feae | 1014 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 1015 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
20a2b49f ED |
1016 | tcp_rsk(req)->rcv_nxt, |
1017 | req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale, | |
9a568de4 | 1018 | tcp_time_stamp_raw() + tcp_rsk(req)->ts_off, |
95a22cae | 1019 | req->ts_recent, sk->sk_bound_dev_if, |
30791ac4 | 1020 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr), |
1d13a96c | 1021 | 0, 0); |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | ||
079096f1 | 1025 | static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1026 | { |
079096f1 | 1027 | #ifdef CONFIG_SYN_COOKIES |
aa8223c7 | 1028 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 1029 | |
af9b4738 | 1030 | if (!th->syn) |
c6aefafb | 1031 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1032 | #endif |
1033 | return sk; | |
1034 | } | |
1035 | ||
1da177e4 LT |
1036 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1037 | { | |
1da177e4 LT |
1038 | if (skb->protocol == htons(ETH_P_IP)) |
1039 | return tcp_v4_conn_request(sk, skb); | |
1040 | ||
1041 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1042 | goto drop; |
1da177e4 | 1043 | |
1fb6f159 OP |
1044 | return tcp_conn_request(&tcp6_request_sock_ops, |
1045 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1046 | |
1047 | drop: | |
9caad864 | 1048 | tcp_listendrop(sk); |
1da177e4 LT |
1049 | return 0; /* don't send reset */ |
1050 | } | |
1051 | ||
ebf6c9cb ED |
1052 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1053 | { | |
1054 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1055 | * and tcp_v6_fill_cb() are going to be called again. | |
1056 | * ip6_datagram_recv_specific_ctl() also expects IP6CB to be there. | |
1057 | */ | |
1058 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1059 | sizeof(struct inet6_skb_parm)); | |
1060 | } | |
1061 | ||
0c27171e | 1062 | static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, |
4c99aa40 | 1063 | struct request_sock *req, |
5e0724d0 ED |
1064 | struct dst_entry *dst, |
1065 | struct request_sock *req_unhash, | |
1066 | bool *own_req) | |
1da177e4 | 1067 | { |
634fb979 | 1068 | struct inet_request_sock *ireq; |
0c27171e ED |
1069 | struct ipv6_pinfo *newnp; |
1070 | const struct ipv6_pinfo *np = inet6_sk(sk); | |
45f6fad8 | 1071 | struct ipv6_txoptions *opt; |
1da177e4 LT |
1072 | struct tcp6_sock *newtcp6sk; |
1073 | struct inet_sock *newinet; | |
1074 | struct tcp_sock *newtp; | |
1075 | struct sock *newsk; | |
cfb6eeb4 YH |
1076 | #ifdef CONFIG_TCP_MD5SIG |
1077 | struct tcp_md5sig_key *key; | |
1078 | #endif | |
3840a06e | 1079 | struct flowi6 fl6; |
1da177e4 LT |
1080 | |
1081 | if (skb->protocol == htons(ETH_P_IP)) { | |
1082 | /* | |
1083 | * v6 mapped | |
1084 | */ | |
1085 | ||
5e0724d0 ED |
1086 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst, |
1087 | req_unhash, own_req); | |
1da177e4 | 1088 | |
63159f29 | 1089 | if (!newsk) |
1da177e4 LT |
1090 | return NULL; |
1091 | ||
1092 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1093 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1094 | ||
1095 | newinet = inet_sk(newsk); | |
1096 | newnp = inet6_sk(newsk); | |
1097 | newtp = tcp_sk(newsk); | |
1098 | ||
1099 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1100 | ||
d1e559d0 | 1101 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1102 | |
8292a17a | 1103 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1104 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1105 | #ifdef CONFIG_TCP_MD5SIG |
1106 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1107 | #endif | |
1108 | ||
83eaddab | 1109 | newnp->ipv6_mc_list = NULL; |
676a1184 YZ |
1110 | newnp->ipv6_ac_list = NULL; |
1111 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1112 | newnp->pktoptions = NULL; |
1113 | newnp->opt = NULL; | |
870c3151 | 1114 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1115 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1116 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1117 | if (np->repflow) |
1118 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1119 | |
e6848976 ACM |
1120 | /* |
1121 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1122 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1123 | * that function for the gory details. -acme | |
1da177e4 | 1124 | */ |
1da177e4 LT |
1125 | |
1126 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1127 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1128 | Sync it now. |
1129 | */ | |
d83d8461 | 1130 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1131 | |
1132 | return newsk; | |
1133 | } | |
1134 | ||
634fb979 | 1135 | ireq = inet_rsk(req); |
1da177e4 LT |
1136 | |
1137 | if (sk_acceptq_is_full(sk)) | |
1138 | goto out_overflow; | |
1139 | ||
493f377d | 1140 | if (!dst) { |
f76b33c3 | 1141 | dst = inet6_csk_route_req(sk, &fl6, req, IPPROTO_TCP); |
493f377d | 1142 | if (!dst) |
1da177e4 | 1143 | goto out; |
1ab1457c | 1144 | } |
1da177e4 LT |
1145 | |
1146 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1147 | if (!newsk) |
093d2823 | 1148 | goto out_nonewsk; |
1da177e4 | 1149 | |
e6848976 ACM |
1150 | /* |
1151 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1152 | * count here, tcp_create_openreq_child now does this for us, see the | |
1153 | * comment in that function for the gory details. -acme | |
1154 | */ | |
1da177e4 | 1155 | |
59eed279 | 1156 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
6bd4f355 | 1157 | ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1158 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1159 | |
1160 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1161 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1162 | ||
1163 | newtp = tcp_sk(newsk); | |
1164 | newinet = inet_sk(newsk); | |
1165 | newnp = inet6_sk(newsk); | |
1166 | ||
1167 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1168 | ||
634fb979 ED |
1169 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1170 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1171 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1172 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1173 | |
1ab1457c | 1174 | /* Now IPv6 options... |
1da177e4 LT |
1175 | |
1176 | First: no IPv4 options. | |
1177 | */ | |
f6d8bd05 | 1178 | newinet->inet_opt = NULL; |
83eaddab | 1179 | newnp->ipv6_mc_list = NULL; |
676a1184 | 1180 | newnp->ipv6_ac_list = NULL; |
d35690be | 1181 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1182 | |
1183 | /* Clone RX bits */ | |
1184 | newnp->rxopt.all = np->rxopt.all; | |
1185 | ||
1da177e4 | 1186 | newnp->pktoptions = NULL; |
1da177e4 | 1187 | newnp->opt = NULL; |
870c3151 | 1188 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1189 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1190 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1191 | if (np->repflow) |
1192 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1193 | |
1194 | /* Clone native IPv6 options from listening socket (if any) | |
1195 | ||
1196 | Yes, keeping reference count would be much more clever, | |
1197 | but we make one more one thing there: reattach optmem | |
1198 | to newsk. | |
1199 | */ | |
56ac42bc HD |
1200 | opt = ireq->ipv6_opt; |
1201 | if (!opt) | |
1202 | opt = rcu_dereference(np->opt); | |
45f6fad8 ED |
1203 | if (opt) { |
1204 | opt = ipv6_dup_options(newsk, opt); | |
1205 | RCU_INIT_POINTER(newnp->opt, opt); | |
1206 | } | |
d83d8461 | 1207 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
45f6fad8 ED |
1208 | if (opt) |
1209 | inet_csk(newsk)->icsk_ext_hdr_len = opt->opt_nflen + | |
1210 | opt->opt_flen; | |
1da177e4 | 1211 | |
81164413 DB |
1212 | tcp_ca_openreq_child(newsk, dst); |
1213 | ||
1da177e4 | 1214 | tcp_sync_mss(newsk, dst_mtu(dst)); |
3541f9e8 | 1215 | newtp->advmss = tcp_mss_clamp(tcp_sk(sk), dst_metric_advmss(dst)); |
d135c522 | 1216 | |
1da177e4 LT |
1217 | tcp_initialize_rcv_mss(newsk); |
1218 | ||
c720c7e8 ED |
1219 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1220 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1221 | |
cfb6eeb4 YH |
1222 | #ifdef CONFIG_TCP_MD5SIG |
1223 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1224 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1225 | if (key) { |
cfb6eeb4 YH |
1226 | /* We're using one, so create a matching key |
1227 | * on the newsk structure. If we fail to get | |
1228 | * memory, then we end up not copying the key | |
1229 | * across. Shucks. | |
1230 | */ | |
efe4208f | 1231 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
6797318e | 1232 | AF_INET6, 128, key->key, key->keylen, |
7450aaf6 | 1233 | sk_gfp_mask(sk, GFP_ATOMIC)); |
cfb6eeb4 YH |
1234 | } |
1235 | #endif | |
1236 | ||
093d2823 | 1237 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1238 | inet_csk_prepare_forced_close(newsk); |
1239 | tcp_done(newsk); | |
093d2823 BS |
1240 | goto out; |
1241 | } | |
5e0724d0 | 1242 | *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); |
805c4bc0 | 1243 | if (*own_req) { |
49a496c9 | 1244 | tcp_move_syn(newtp, req); |
805c4bc0 ED |
1245 | |
1246 | /* Clone pktoptions received with SYN, if we own the req */ | |
1247 | if (ireq->pktopts) { | |
1248 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
7450aaf6 | 1249 | sk_gfp_mask(sk, GFP_ATOMIC)); |
805c4bc0 ED |
1250 | consume_skb(ireq->pktopts); |
1251 | ireq->pktopts = NULL; | |
ebf6c9cb ED |
1252 | if (newnp->pktoptions) { |
1253 | tcp_v6_restore_cb(newnp->pktoptions); | |
805c4bc0 | 1254 | skb_set_owner_r(newnp->pktoptions, newsk); |
ebf6c9cb | 1255 | } |
805c4bc0 | 1256 | } |
ce105008 | 1257 | } |
1da177e4 LT |
1258 | |
1259 | return newsk; | |
1260 | ||
1261 | out_overflow: | |
02a1d6e7 | 1262 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1263 | out_nonewsk: |
1da177e4 | 1264 | dst_release(dst); |
093d2823 | 1265 | out: |
9caad864 | 1266 | tcp_listendrop(sk); |
1da177e4 LT |
1267 | return NULL; |
1268 | } | |
1269 | ||
1da177e4 | 1270 | /* The socket must have it's spinlock held when we get |
e994b2f0 | 1271 | * here, unless it is a TCP_LISTEN socket. |
1da177e4 LT |
1272 | * |
1273 | * We have a potential double-lock case here, so even when | |
1274 | * doing backlog processing we use the BH locking scheme. | |
1275 | * This is because we cannot sleep with the original spinlock | |
1276 | * held. | |
1277 | */ | |
1278 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1279 | { | |
1280 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1281 | struct tcp_sock *tp; | |
1282 | struct sk_buff *opt_skb = NULL; | |
1283 | ||
1284 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1285 | goes to IPv4 receive handler and backlogged. | |
1286 | From backlog it always goes here. Kerboom... | |
1287 | Fortunately, tcp_rcv_established and rcv_established | |
1288 | handle them correctly, but it is not case with | |
1289 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1290 | */ | |
1291 | ||
1292 | if (skb->protocol == htons(ETH_P_IP)) | |
1293 | return tcp_v4_do_rcv(sk, skb); | |
1294 | ||
1da177e4 LT |
1295 | /* |
1296 | * socket locking is here for SMP purposes as backlog rcv | |
1297 | * is currently called with bh processing disabled. | |
1298 | */ | |
1299 | ||
1300 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1301 | ||
1302 | Yes, guys, it is the only place in our code, where we | |
1303 | may make it not affecting IPv4. | |
1304 | The rest of code is protocol independent, | |
1305 | and I do not like idea to uglify IPv4. | |
1306 | ||
1307 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1308 | looks not very well thought. For now we latch | |
1309 | options, received in the last packet, enqueued | |
1310 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1311 | --ANK (980728) |
1da177e4 LT |
1312 | */ |
1313 | if (np->rxopt.all) | |
7450aaf6 | 1314 | opt_skb = skb_clone(skb, sk_gfp_mask(sk, GFP_ATOMIC)); |
1da177e4 LT |
1315 | |
1316 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1317 | struct dst_entry *dst = sk->sk_rx_dst; |
1318 | ||
bdeab991 | 1319 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1320 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1321 | if (dst) { |
1322 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1323 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1324 | dst_release(dst); | |
1325 | sk->sk_rx_dst = NULL; | |
1326 | } | |
1327 | } | |
1328 | ||
3d97d88e | 1329 | tcp_rcv_established(sk, skb); |
1da177e4 LT |
1330 | if (opt_skb) |
1331 | goto ipv6_pktoptions; | |
1332 | return 0; | |
1333 | } | |
1334 | ||
12e25e10 | 1335 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1336 | goto csum_err; |
1337 | ||
1ab1457c | 1338 | if (sk->sk_state == TCP_LISTEN) { |
079096f1 ED |
1339 | struct sock *nsk = tcp_v6_cookie_check(sk, skb); |
1340 | ||
1da177e4 LT |
1341 | if (!nsk) |
1342 | goto discard; | |
1343 | ||
4c99aa40 | 1344 | if (nsk != sk) { |
1da177e4 LT |
1345 | if (tcp_child_process(sk, nsk, skb)) |
1346 | goto reset; | |
1347 | if (opt_skb) | |
1348 | __kfree_skb(opt_skb); | |
1349 | return 0; | |
1350 | } | |
47482f13 | 1351 | } else |
bdeab991 | 1352 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1353 | |
72ab4a86 | 1354 | if (tcp_rcv_state_process(sk, skb)) |
1da177e4 | 1355 | goto reset; |
1da177e4 LT |
1356 | if (opt_skb) |
1357 | goto ipv6_pktoptions; | |
1358 | return 0; | |
1359 | ||
1360 | reset: | |
cfb6eeb4 | 1361 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1362 | discard: |
1363 | if (opt_skb) | |
1364 | __kfree_skb(opt_skb); | |
1365 | kfree_skb(skb); | |
1366 | return 0; | |
1367 | csum_err: | |
c10d9310 ED |
1368 | TCP_INC_STATS(sock_net(sk), TCP_MIB_CSUMERRORS); |
1369 | TCP_INC_STATS(sock_net(sk), TCP_MIB_INERRS); | |
1da177e4 LT |
1370 | goto discard; |
1371 | ||
1372 | ||
1373 | ipv6_pktoptions: | |
1374 | /* Do you ask, what is it? | |
1375 | ||
1376 | 1. skb was enqueued by tcp. | |
1377 | 2. skb is added to tail of read queue, rather than out of order. | |
1378 | 3. socket is not in passive state. | |
1379 | 4. Finally, it really contains options, which user wants to receive. | |
1380 | */ | |
1381 | tp = tcp_sk(sk); | |
1382 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1383 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1384 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1385 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1386 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1387 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1388 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1389 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1390 | if (np->repflow) |
1391 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1392 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 | 1393 | skb_set_owner_r(opt_skb, sk); |
8ce48623 | 1394 | tcp_v6_restore_cb(opt_skb); |
1da177e4 LT |
1395 | opt_skb = xchg(&np->pktoptions, opt_skb); |
1396 | } else { | |
1397 | __kfree_skb(opt_skb); | |
1398 | opt_skb = xchg(&np->pktoptions, NULL); | |
1399 | } | |
1400 | } | |
1401 | ||
800d55f1 | 1402 | kfree_skb(opt_skb); |
1da177e4 LT |
1403 | return 0; |
1404 | } | |
1405 | ||
2dc49d16 ND |
1406 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1407 | const struct tcphdr *th) | |
1408 | { | |
1409 | /* This is tricky: we move IP6CB at its correct location into | |
1410 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1411 | * _decode_session6() uses IP6CB(). | |
1412 | * barrier() makes sure compiler won't play aliasing games. | |
1413 | */ | |
1414 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1415 | sizeof(struct inet6_skb_parm)); | |
1416 | barrier(); | |
1417 | ||
1418 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1419 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1420 | skb->len - th->doff*4); | |
1421 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1422 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1423 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1424 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1425 | TCP_SKB_CB(skb)->sacked = 0; | |
98aaa913 MM |
1426 | TCP_SKB_CB(skb)->has_rxtstamp = |
1427 | skb->tstamp || skb_hwtstamps(skb)->hwtstamp; | |
2dc49d16 ND |
1428 | } |
1429 | ||
e5bbef20 | 1430 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1431 | { |
4297a0ef | 1432 | int sdif = inet6_sdif(skb); |
cf533ea5 | 1433 | const struct tcphdr *th; |
b71d1d42 | 1434 | const struct ipv6hdr *hdr; |
3b24d854 | 1435 | bool refcounted; |
1da177e4 LT |
1436 | struct sock *sk; |
1437 | int ret; | |
a86b1e30 | 1438 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1439 | |
1440 | if (skb->pkt_type != PACKET_HOST) | |
1441 | goto discard_it; | |
1442 | ||
1443 | /* | |
1444 | * Count it even if it's bad. | |
1445 | */ | |
90bbcc60 | 1446 | __TCP_INC_STATS(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1447 | |
1448 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1449 | goto discard_it; | |
1450 | ||
ea1627c2 | 1451 | th = (const struct tcphdr *)skb->data; |
1da177e4 | 1452 | |
ea1627c2 | 1453 | if (unlikely(th->doff < sizeof(struct tcphdr)/4)) |
1da177e4 LT |
1454 | goto bad_packet; |
1455 | if (!pskb_may_pull(skb, th->doff*4)) | |
1456 | goto discard_it; | |
1457 | ||
e4f45b7f | 1458 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1459 | goto csum_error; |
1da177e4 | 1460 | |
ea1627c2 | 1461 | th = (const struct tcphdr *)skb->data; |
e802af9c | 1462 | hdr = ipv6_hdr(skb); |
1da177e4 | 1463 | |
4bdc3d66 | 1464 | lookup: |
a583636a | 1465 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, __tcp_hdrlen(th), |
4297a0ef | 1466 | th->source, th->dest, inet6_iif(skb), sdif, |
3b24d854 | 1467 | &refcounted); |
1da177e4 LT |
1468 | if (!sk) |
1469 | goto no_tcp_socket; | |
1470 | ||
1471 | process: | |
1472 | if (sk->sk_state == TCP_TIME_WAIT) | |
1473 | goto do_time_wait; | |
1474 | ||
079096f1 ED |
1475 | if (sk->sk_state == TCP_NEW_SYN_RECV) { |
1476 | struct request_sock *req = inet_reqsk(sk); | |
e0f9759f | 1477 | bool req_stolen = false; |
7716682c | 1478 | struct sock *nsk; |
079096f1 ED |
1479 | |
1480 | sk = req->rsk_listener; | |
079096f1 | 1481 | if (tcp_v6_inbound_md5_hash(sk, skb)) { |
e65c332d | 1482 | sk_drops_add(sk, skb); |
079096f1 ED |
1483 | reqsk_put(req); |
1484 | goto discard_it; | |
1485 | } | |
4fd44a98 FL |
1486 | if (tcp_checksum_complete(skb)) { |
1487 | reqsk_put(req); | |
1488 | goto csum_error; | |
1489 | } | |
7716682c | 1490 | if (unlikely(sk->sk_state != TCP_LISTEN)) { |
f03f2e15 | 1491 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
4bdc3d66 ED |
1492 | goto lookup; |
1493 | } | |
7716682c | 1494 | sock_hold(sk); |
3b24d854 | 1495 | refcounted = true; |
1f3b359f | 1496 | nsk = NULL; |
eeea10b8 ED |
1497 | if (!tcp_filter(sk, skb)) { |
1498 | th = (const struct tcphdr *)skb->data; | |
1499 | hdr = ipv6_hdr(skb); | |
1500 | tcp_v6_fill_cb(skb, hdr, th); | |
e0f9759f | 1501 | nsk = tcp_check_req(sk, skb, req, false, &req_stolen); |
eeea10b8 | 1502 | } |
079096f1 ED |
1503 | if (!nsk) { |
1504 | reqsk_put(req); | |
e0f9759f ED |
1505 | if (req_stolen) { |
1506 | /* Another cpu got exclusive access to req | |
1507 | * and created a full blown socket. | |
1508 | * Try to feed this packet to this socket | |
1509 | * instead of discarding it. | |
1510 | */ | |
1511 | tcp_v6_restore_cb(skb); | |
1512 | sock_put(sk); | |
1513 | goto lookup; | |
1514 | } | |
7716682c | 1515 | goto discard_and_relse; |
079096f1 ED |
1516 | } |
1517 | if (nsk == sk) { | |
079096f1 ED |
1518 | reqsk_put(req); |
1519 | tcp_v6_restore_cb(skb); | |
1520 | } else if (tcp_child_process(sk, nsk, skb)) { | |
1521 | tcp_v6_send_reset(nsk, skb); | |
7716682c | 1522 | goto discard_and_relse; |
079096f1 | 1523 | } else { |
7716682c | 1524 | sock_put(sk); |
079096f1 ED |
1525 | return 0; |
1526 | } | |
1527 | } | |
e802af9c | 1528 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
02a1d6e7 | 1529 | __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); |
e802af9c SH |
1530 | goto discard_and_relse; |
1531 | } | |
1532 | ||
1da177e4 LT |
1533 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1534 | goto discard_and_relse; | |
1535 | ||
9ea88a15 DP |
1536 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
1537 | goto discard_and_relse; | |
9ea88a15 | 1538 | |
ac6e7800 | 1539 | if (tcp_filter(sk, skb)) |
1da177e4 | 1540 | goto discard_and_relse; |
ac6e7800 ED |
1541 | th = (const struct tcphdr *)skb->data; |
1542 | hdr = ipv6_hdr(skb); | |
eeea10b8 | 1543 | tcp_v6_fill_cb(skb, hdr, th); |
1da177e4 LT |
1544 | |
1545 | skb->dev = NULL; | |
1546 | ||
e994b2f0 ED |
1547 | if (sk->sk_state == TCP_LISTEN) { |
1548 | ret = tcp_v6_do_rcv(sk, skb); | |
1549 | goto put_and_return; | |
1550 | } | |
1551 | ||
1552 | sk_incoming_cpu_update(sk); | |
1553 | ||
293b9c42 | 1554 | bh_lock_sock_nested(sk); |
a44d6eac | 1555 | tcp_segs_in(tcp_sk(sk), skb); |
1da177e4 LT |
1556 | ret = 0; |
1557 | if (!sock_owned_by_user(sk)) { | |
e7942d06 | 1558 | ret = tcp_v6_do_rcv(sk, skb); |
c9c33212 | 1559 | } else if (tcp_add_backlog(sk, skb)) { |
6b03a53a ZY |
1560 | goto discard_and_relse; |
1561 | } | |
1da177e4 LT |
1562 | bh_unlock_sock(sk); |
1563 | ||
e994b2f0 | 1564 | put_and_return: |
3b24d854 ED |
1565 | if (refcounted) |
1566 | sock_put(sk); | |
1da177e4 LT |
1567 | return ret ? -1 : 0; |
1568 | ||
1569 | no_tcp_socket: | |
1570 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1571 | goto discard_it; | |
1572 | ||
2dc49d16 ND |
1573 | tcp_v6_fill_cb(skb, hdr, th); |
1574 | ||
12e25e10 | 1575 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 | 1576 | csum_error: |
90bbcc60 | 1577 | __TCP_INC_STATS(net, TCP_MIB_CSUMERRORS); |
1da177e4 | 1578 | bad_packet: |
90bbcc60 | 1579 | __TCP_INC_STATS(net, TCP_MIB_INERRS); |
1da177e4 | 1580 | } else { |
cfb6eeb4 | 1581 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1582 | } |
1583 | ||
1584 | discard_it: | |
1da177e4 LT |
1585 | kfree_skb(skb); |
1586 | return 0; | |
1587 | ||
1588 | discard_and_relse: | |
532182cd | 1589 | sk_drops_add(sk, skb); |
3b24d854 ED |
1590 | if (refcounted) |
1591 | sock_put(sk); | |
1da177e4 LT |
1592 | goto discard_it; |
1593 | ||
1594 | do_time_wait: | |
1595 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1596 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1597 | goto discard_it; |
1598 | } | |
1599 | ||
2dc49d16 ND |
1600 | tcp_v6_fill_cb(skb, hdr, th); |
1601 | ||
6a5dc9e5 ED |
1602 | if (tcp_checksum_complete(skb)) { |
1603 | inet_twsk_put(inet_twsk(sk)); | |
1604 | goto csum_error; | |
1da177e4 LT |
1605 | } |
1606 | ||
9469c7b4 | 1607 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1608 | case TCP_TW_SYN: |
1609 | { | |
1610 | struct sock *sk2; | |
1611 | ||
c346dca1 | 1612 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
a583636a | 1613 | skb, __tcp_hdrlen(th), |
5ba24953 | 1614 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1615 | &ipv6_hdr(skb)->daddr, |
24b711ed DA |
1616 | ntohs(th->dest), |
1617 | tcp_v6_iif_l3_slave(skb), | |
4297a0ef | 1618 | sdif); |
53b24b8f | 1619 | if (sk2) { |
295ff7ed | 1620 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1621 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1622 | sk = sk2; |
4ad19de8 | 1623 | tcp_v6_restore_cb(skb); |
3b24d854 | 1624 | refcounted = false; |
1da177e4 LT |
1625 | goto process; |
1626 | } | |
1da177e4 | 1627 | } |
275757e6 GS |
1628 | /* to ACK */ |
1629 | /* fall through */ | |
1da177e4 LT |
1630 | case TCP_TW_ACK: |
1631 | tcp_v6_timewait_ack(sk, skb); | |
1632 | break; | |
1633 | case TCP_TW_RST: | |
271c3b9b FW |
1634 | tcp_v6_send_reset(sk, skb); |
1635 | inet_twsk_deschedule_put(inet_twsk(sk)); | |
1636 | goto discard_it; | |
4aa956d8 WY |
1637 | case TCP_TW_SUCCESS: |
1638 | ; | |
1da177e4 LT |
1639 | } |
1640 | goto discard_it; | |
1641 | } | |
1642 | ||
c7109986 ED |
1643 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1644 | { | |
1645 | const struct ipv6hdr *hdr; | |
1646 | const struct tcphdr *th; | |
1647 | struct sock *sk; | |
1648 | ||
1649 | if (skb->pkt_type != PACKET_HOST) | |
1650 | return; | |
1651 | ||
1652 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1653 | return; | |
1654 | ||
1655 | hdr = ipv6_hdr(skb); | |
1656 | th = tcp_hdr(skb); | |
1657 | ||
1658 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1659 | return; | |
1660 | ||
870c3151 | 1661 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1662 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1663 | &hdr->saddr, th->source, | |
1664 | &hdr->daddr, ntohs(th->dest), | |
4297a0ef | 1665 | inet6_iif(skb), inet6_sdif(skb)); |
c7109986 ED |
1666 | if (sk) { |
1667 | skb->sk = sk; | |
1668 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1669 | if (sk_fullsock(sk)) { |
d0c294c5 | 1670 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1671 | |
c7109986 | 1672 | if (dst) |
5d299f3d | 1673 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1674 | if (dst && |
f3f12135 | 1675 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1676 | skb_dst_set_noref(skb, dst); |
1677 | } | |
1678 | } | |
1679 | } | |
1680 | ||
ccb7c410 DM |
1681 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1682 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1683 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1684 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1685 | }; |
1686 | ||
3b401a81 | 1687 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1688 | .queue_xmit = inet6_csk_xmit, |
1689 | .send_check = tcp_v6_send_check, | |
1690 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1691 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1692 | .conn_request = tcp_v6_conn_request, |
1693 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1694 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1695 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1696 | .setsockopt = ipv6_setsockopt, |
1697 | .getsockopt = ipv6_getsockopt, | |
1698 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1699 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1700 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1701 | .compat_setsockopt = compat_ipv6_setsockopt, |
1702 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1703 | #endif |
4fab9071 | 1704 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1705 | }; |
1706 | ||
cfb6eeb4 | 1707 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1708 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1709 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1710 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1711 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1712 | }; |
a928630a | 1713 | #endif |
cfb6eeb4 | 1714 | |
1da177e4 LT |
1715 | /* |
1716 | * TCP over IPv4 via INET6 API | |
1717 | */ | |
3b401a81 | 1718 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1719 | .queue_xmit = ip_queue_xmit, |
1720 | .send_check = tcp_v4_send_check, | |
1721 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1722 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1723 | .conn_request = tcp_v6_conn_request, |
1724 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1725 | .net_header_len = sizeof(struct iphdr), |
1726 | .setsockopt = ipv6_setsockopt, | |
1727 | .getsockopt = ipv6_getsockopt, | |
1728 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1729 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
3fdadf7d | 1730 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1731 | .compat_setsockopt = compat_ipv6_setsockopt, |
1732 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1733 | #endif |
4fab9071 | 1734 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1735 | }; |
1736 | ||
cfb6eeb4 | 1737 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1738 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1739 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1740 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1741 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1742 | }; |
a928630a | 1743 | #endif |
cfb6eeb4 | 1744 | |
1da177e4 LT |
1745 | /* NOTE: A lot of things set to zero explicitly by call to |
1746 | * sk_alloc() so need not be done here. | |
1747 | */ | |
1748 | static int tcp_v6_init_sock(struct sock *sk) | |
1749 | { | |
6687e988 | 1750 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1751 | |
900f65d3 | 1752 | tcp_init_sock(sk); |
1da177e4 | 1753 | |
8292a17a | 1754 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1755 | |
cfb6eeb4 | 1756 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1757 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1758 | #endif |
1759 | ||
1da177e4 LT |
1760 | return 0; |
1761 | } | |
1762 | ||
7d06b2e0 | 1763 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1764 | { |
1da177e4 | 1765 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1766 | inet6_destroy_sock(sk); |
1da177e4 LT |
1767 | } |
1768 | ||
952a10be | 1769 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1770 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1771 | static void get_openreq6(struct seq_file *seq, |
aa3a0c8c | 1772 | const struct request_sock *req, int i) |
1da177e4 | 1773 | { |
fa76ce73 | 1774 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1775 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1776 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1777 | |
1778 | if (ttd < 0) | |
1779 | ttd = 0; | |
1780 | ||
1da177e4 LT |
1781 | seq_printf(seq, |
1782 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1783 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1784 | i, |
1785 | src->s6_addr32[0], src->s6_addr32[1], | |
1786 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1787 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1788 | dest->s6_addr32[0], dest->s6_addr32[1], |
1789 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1790 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1791 | TCP_SYN_RECV, |
4c99aa40 | 1792 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1793 | 1, /* timers active (only the expire timer) */ |
1794 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1795 | req->num_timeout, |
aa3a0c8c ED |
1796 | from_kuid_munged(seq_user_ns(seq), |
1797 | sock_i_uid(req->rsk_listener)), | |
1ab1457c | 1798 | 0, /* non standard timer */ |
1da177e4 LT |
1799 | 0, /* open_requests have no inode */ |
1800 | 0, req); | |
1801 | } | |
1802 | ||
1803 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1804 | { | |
b71d1d42 | 1805 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1806 | __u16 destp, srcp; |
1807 | int timer_active; | |
1808 | unsigned long timer_expires; | |
cf533ea5 ED |
1809 | const struct inet_sock *inet = inet_sk(sp); |
1810 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1811 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0536fcc0 | 1812 | const struct fastopen_queue *fastopenq = &icsk->icsk_accept_queue.fastopenq; |
00fd38d9 ED |
1813 | int rx_queue; |
1814 | int state; | |
1da177e4 | 1815 | |
efe4208f ED |
1816 | dest = &sp->sk_v6_daddr; |
1817 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1818 | destp = ntohs(inet->inet_dport); |
1819 | srcp = ntohs(inet->inet_sport); | |
463c84b9 | 1820 | |
ce3cf4ec | 1821 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
57dde7f7 | 1822 | icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT || |
ce3cf4ec | 1823 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { |
1da177e4 | 1824 | timer_active = 1; |
463c84b9 ACM |
1825 | timer_expires = icsk->icsk_timeout; |
1826 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1827 | timer_active = 4; |
463c84b9 | 1828 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1829 | } else if (timer_pending(&sp->sk_timer)) { |
1830 | timer_active = 2; | |
1831 | timer_expires = sp->sk_timer.expires; | |
1832 | } else { | |
1833 | timer_active = 0; | |
1834 | timer_expires = jiffies; | |
1835 | } | |
1836 | ||
986ffdfd | 1837 | state = inet_sk_state_load(sp); |
00fd38d9 ED |
1838 | if (state == TCP_LISTEN) |
1839 | rx_queue = sp->sk_ack_backlog; | |
1840 | else | |
1841 | /* Because we don't lock the socket, | |
1842 | * we might find a transient negative value. | |
1843 | */ | |
1844 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
1845 | ||
1da177e4 LT |
1846 | seq_printf(seq, |
1847 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1848 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1849 | i, |
1850 | src->s6_addr32[0], src->s6_addr32[1], | |
1851 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1852 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1853 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
00fd38d9 ED |
1854 | state, |
1855 | tp->write_seq - tp->snd_una, | |
1856 | rx_queue, | |
1da177e4 | 1857 | timer_active, |
a399a805 | 1858 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1859 | icsk->icsk_retransmits, |
a7cb5a49 | 1860 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1861 | icsk->icsk_probes_out, |
1da177e4 | 1862 | sock_i_ino(sp), |
41c6d650 | 1863 | refcount_read(&sp->sk_refcnt), sp, |
7be87351 SH |
1864 | jiffies_to_clock_t(icsk->icsk_rto), |
1865 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1866 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1867 | tp->snd_cwnd, |
00fd38d9 | 1868 | state == TCP_LISTEN ? |
0536fcc0 | 1869 | fastopenq->max_qlen : |
0a672f74 | 1870 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) |
1da177e4 LT |
1871 | ); |
1872 | } | |
1873 | ||
1ab1457c | 1874 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1875 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1876 | { |
789f558c | 1877 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1878 | const struct in6_addr *dest, *src; |
1da177e4 | 1879 | __u16 destp, srcp; |
1da177e4 | 1880 | |
efe4208f ED |
1881 | dest = &tw->tw_v6_daddr; |
1882 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1883 | destp = ntohs(tw->tw_dport); |
1884 | srcp = ntohs(tw->tw_sport); | |
1885 | ||
1886 | seq_printf(seq, | |
1887 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1888 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1889 | i, |
1890 | src->s6_addr32[0], src->s6_addr32[1], | |
1891 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1892 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1893 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1894 | tw->tw_substate, 0, 0, | |
a399a805 | 1895 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
41c6d650 | 1896 | refcount_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
1897 | } |
1898 | ||
1da177e4 LT |
1899 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1900 | { | |
1901 | struct tcp_iter_state *st; | |
05dbc7b5 | 1902 | struct sock *sk = v; |
1da177e4 LT |
1903 | |
1904 | if (v == SEQ_START_TOKEN) { | |
1905 | seq_puts(seq, | |
1906 | " sl " | |
1907 | "local_address " | |
1908 | "remote_address " | |
1909 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1910 | " uid timeout inode\n"); | |
1911 | goto out; | |
1912 | } | |
1913 | st = seq->private; | |
1914 | ||
079096f1 ED |
1915 | if (sk->sk_state == TCP_TIME_WAIT) |
1916 | get_timewait6_sock(seq, v, st->num); | |
1917 | else if (sk->sk_state == TCP_NEW_SYN_RECV) | |
aa3a0c8c | 1918 | get_openreq6(seq, v, st->num); |
079096f1 ED |
1919 | else |
1920 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1921 | out: |
1922 | return 0; | |
1923 | } | |
1924 | ||
37d849bb CH |
1925 | static const struct seq_operations tcp6_seq_ops = { |
1926 | .show = tcp6_seq_show, | |
1927 | .start = tcp_seq_start, | |
1928 | .next = tcp_seq_next, | |
1929 | .stop = tcp_seq_stop, | |
1930 | }; | |
1931 | ||
1da177e4 | 1932 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 | 1933 | .family = AF_INET6, |
1da177e4 LT |
1934 | }; |
1935 | ||
2c8c1e72 | 1936 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1937 | { |
c3506372 CH |
1938 | if (!proc_create_net_data("tcp6", 0444, net->proc_net, &tcp6_seq_ops, |
1939 | sizeof(struct tcp_iter_state), &tcp6_seq_afinfo)) | |
37d849bb CH |
1940 | return -ENOMEM; |
1941 | return 0; | |
1da177e4 LT |
1942 | } |
1943 | ||
6f8b13bc | 1944 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1945 | { |
37d849bb | 1946 | remove_proc_entry("tcp6", net->proc_net); |
1da177e4 LT |
1947 | } |
1948 | #endif | |
1949 | ||
1950 | struct proto tcpv6_prot = { | |
1951 | .name = "TCPv6", | |
1952 | .owner = THIS_MODULE, | |
1953 | .close = tcp_close, | |
d74bad4e | 1954 | .pre_connect = tcp_v6_pre_connect, |
1da177e4 LT |
1955 | .connect = tcp_v6_connect, |
1956 | .disconnect = tcp_disconnect, | |
463c84b9 | 1957 | .accept = inet_csk_accept, |
1da177e4 LT |
1958 | .ioctl = tcp_ioctl, |
1959 | .init = tcp_v6_init_sock, | |
1960 | .destroy = tcp_v6_destroy_sock, | |
1961 | .shutdown = tcp_shutdown, | |
1962 | .setsockopt = tcp_setsockopt, | |
1963 | .getsockopt = tcp_getsockopt, | |
4b9d07a4 | 1964 | .keepalive = tcp_set_keepalive, |
1da177e4 | 1965 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1966 | .sendmsg = tcp_sendmsg, |
1967 | .sendpage = tcp_sendpage, | |
1da177e4 | 1968 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1969 | .release_cb = tcp_release_cb, |
496611d7 | 1970 | .hash = inet6_hash, |
ab1e0a13 ACM |
1971 | .unhash = inet_unhash, |
1972 | .get_port = inet_csk_get_port, | |
1da177e4 | 1973 | .enter_memory_pressure = tcp_enter_memory_pressure, |
06044751 | 1974 | .leave_memory_pressure = tcp_leave_memory_pressure, |
c9bee3b7 | 1975 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1976 | .sockets_allocated = &tcp_sockets_allocated, |
1977 | .memory_allocated = &tcp_memory_allocated, | |
1978 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1979 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1980 | .sysctl_mem = sysctl_tcp_mem, |
356d1833 ED |
1981 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem), |
1982 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_tcp_rmem), | |
1da177e4 LT |
1983 | .max_header = MAX_TCP_HEADER, |
1984 | .obj_size = sizeof(struct tcp6_sock), | |
5f0d5a3a | 1985 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
6d6ee43e | 1986 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1987 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1988 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1989 | .no_autobind = true, |
543d9cfe ACM |
1990 | #ifdef CONFIG_COMPAT |
1991 | .compat_setsockopt = compat_tcp_setsockopt, | |
1992 | .compat_getsockopt = compat_tcp_getsockopt, | |
d1a4c0b3 | 1993 | #endif |
c1e64e29 | 1994 | .diag_destroy = tcp_abort, |
1da177e4 LT |
1995 | }; |
1996 | ||
a8e3bb34 DA |
1997 | /* thinking of making this const? Don't. |
1998 | * early_demux can change based on sysctl. | |
1999 | */ | |
39294c3d | 2000 | static struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2001 | .early_demux = tcp_v6_early_demux, |
dddb64bc | 2002 | .early_demux_handler = tcp_v6_early_demux, |
1da177e4 LT |
2003 | .handler = tcp_v6_rcv, |
2004 | .err_handler = tcp_v6_err, | |
2005 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
2006 | }; | |
2007 | ||
1da177e4 LT |
2008 | static struct inet_protosw tcpv6_protosw = { |
2009 | .type = SOCK_STREAM, | |
2010 | .protocol = IPPROTO_TCP, | |
2011 | .prot = &tcpv6_prot, | |
2012 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
2013 | .flags = INET_PROTOSW_PERMANENT | |
2014 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2015 | }; |
2016 | ||
2c8c1e72 | 2017 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2018 | { |
5677242f DL |
2019 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2020 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2021 | } |
2022 | ||
2c8c1e72 | 2023 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2024 | { |
5677242f | 2025 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2026 | } |
2027 | ||
2c8c1e72 | 2028 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 | 2029 | { |
1946e672 | 2030 | inet_twsk_purge(&tcp_hashinfo, AF_INET6); |
93ec926b DL |
2031 | } |
2032 | ||
2033 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2034 | .init = tcpv6_net_init, |
2035 | .exit = tcpv6_net_exit, | |
2036 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2037 | }; |
2038 | ||
7f4e4868 | 2039 | int __init tcpv6_init(void) |
1da177e4 | 2040 | { |
7f4e4868 DL |
2041 | int ret; |
2042 | ||
3336288a VY |
2043 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2044 | if (ret) | |
c6b641a4 | 2045 | goto out; |
3336288a | 2046 | |
1da177e4 | 2047 | /* register inet6 protocol */ |
7f4e4868 DL |
2048 | ret = inet6_register_protosw(&tcpv6_protosw); |
2049 | if (ret) | |
2050 | goto out_tcpv6_protocol; | |
2051 | ||
93ec926b | 2052 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2053 | if (ret) |
2054 | goto out_tcpv6_protosw; | |
2055 | out: | |
2056 | return ret; | |
ae0f7d5f | 2057 | |
7f4e4868 DL |
2058 | out_tcpv6_protosw: |
2059 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2060 | out_tcpv6_protocol: |
2061 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2062 | goto out; |
2063 | } | |
2064 | ||
09f7709f | 2065 | void tcpv6_exit(void) |
7f4e4868 | 2066 | { |
93ec926b | 2067 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2068 | inet6_unregister_protosw(&tcpv6_protosw); |
2069 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2070 | } |