Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
3d58b5fa | 62 | #include <net/inet_common.h> |
6e5714ea | 63 | #include <net/secure_seq.h> |
d1a4c0b3 | 64 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 65 | #include <net/busy_poll.h> |
1da177e4 | 66 | |
1da177e4 LT |
67 | #include <linux/proc_fs.h> |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
3b401a81 SH |
79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
84 | #else |
85 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 86 | const struct in6_addr *addr) |
9501f972 YH |
87 | { |
88 | return NULL; | |
89 | } | |
a928630a | 90 | #endif |
1da177e4 | 91 | |
fae6ef87 NC |
92 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
93 | { | |
94 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 95 | |
ca777eff ED |
96 | if (dst) { |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
102 | if (rt->rt6i_node) | |
103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
104 | } | |
fae6ef87 NC |
105 | } |
106 | ||
cf533ea5 | 107 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 108 | { |
0660e03f ACM |
109 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
110 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
111 | tcp_hdr(skb)->dest, |
112 | tcp_hdr(skb)->source); | |
1da177e4 LT |
113 | } |
114 | ||
1ab1457c | 115 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
116 | int addr_len) |
117 | { | |
118 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 119 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 120 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
121 | struct ipv6_pinfo *np = inet6_sk(sk); |
122 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 123 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 124 | struct rt6_info *rt; |
4c9483b2 | 125 | struct flowi6 fl6; |
1da177e4 LT |
126 | struct dst_entry *dst; |
127 | int addr_type; | |
128 | int err; | |
129 | ||
1ab1457c | 130 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
131 | return -EINVAL; |
132 | ||
1ab1457c | 133 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 134 | return -EAFNOSUPPORT; |
1da177e4 | 135 | |
4c9483b2 | 136 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
137 | |
138 | if (np->sndflow) { | |
4c9483b2 DM |
139 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
140 | IP6_ECN_flow_init(fl6.flowlabel); | |
141 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 142 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 143 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
144 | if (flowlabel == NULL) |
145 | return -EINVAL; | |
1da177e4 LT |
146 | fl6_sock_release(flowlabel); |
147 | } | |
148 | } | |
149 | ||
150 | /* | |
1ab1457c YH |
151 | * connect() to INADDR_ANY means loopback (BSD'ism). |
152 | */ | |
153 | ||
4c99aa40 | 154 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 155 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
156 | |
157 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
158 | ||
4c99aa40 | 159 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
160 | return -ENETUNREACH; |
161 | ||
162 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
163 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
164 | usin->sin6_scope_id) { | |
165 | /* If interface is set while binding, indices | |
166 | * must coincide. | |
167 | */ | |
168 | if (sk->sk_bound_dev_if && | |
169 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
170 | return -EINVAL; | |
171 | ||
172 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
173 | } | |
174 | ||
175 | /* Connect to link-local address requires an interface */ | |
176 | if (!sk->sk_bound_dev_if) | |
177 | return -EINVAL; | |
178 | } | |
179 | ||
180 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 181 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
182 | tp->rx_opt.ts_recent = 0; |
183 | tp->rx_opt.ts_recent_stamp = 0; | |
184 | tp->write_seq = 0; | |
185 | } | |
186 | ||
efe4208f | 187 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 188 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
189 | |
190 | /* | |
191 | * TCP over IPv4 | |
192 | */ | |
193 | ||
194 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 195 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
196 | struct sockaddr_in sin; |
197 | ||
198 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
199 | ||
200 | if (__ipv6_only_sock(sk)) | |
201 | return -ENETUNREACH; | |
202 | ||
203 | sin.sin_family = AF_INET; | |
204 | sin.sin_port = usin->sin6_port; | |
205 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
206 | ||
d83d8461 | 207 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 208 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
209 | #ifdef CONFIG_TCP_MD5SIG |
210 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
211 | #endif | |
1da177e4 LT |
212 | |
213 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
214 | ||
215 | if (err) { | |
d83d8461 ACM |
216 | icsk->icsk_ext_hdr_len = exthdrlen; |
217 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 218 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
219 | #ifdef CONFIG_TCP_MD5SIG |
220 | tp->af_specific = &tcp_sock_ipv6_specific; | |
221 | #endif | |
1da177e4 | 222 | goto failure; |
1da177e4 | 223 | } |
d1e559d0 | 224 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
225 | |
226 | return err; | |
227 | } | |
228 | ||
efe4208f ED |
229 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
230 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 231 | |
4c9483b2 | 232 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 233 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 234 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
235 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
236 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
237 | fl6.fl6_dport = usin->sin6_port; |
238 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 239 | |
4c9483b2 | 240 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 241 | |
4c9483b2 | 242 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 243 | |
0e0d44ab | 244 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
245 | if (IS_ERR(dst)) { |
246 | err = PTR_ERR(dst); | |
1da177e4 | 247 | goto failure; |
14e50e57 | 248 | } |
1da177e4 LT |
249 | |
250 | if (saddr == NULL) { | |
4c9483b2 | 251 | saddr = &fl6.saddr; |
efe4208f | 252 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
253 | } |
254 | ||
255 | /* set the source address */ | |
4e3fd7a0 | 256 | np->saddr = *saddr; |
c720c7e8 | 257 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 258 | |
f83ef8c0 | 259 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 260 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 261 | |
493f377d DM |
262 | rt = (struct rt6_info *) dst; |
263 | if (tcp_death_row.sysctl_tw_recycle && | |
264 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 265 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 266 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 267 | |
d83d8461 | 268 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 269 | if (np->opt) |
d83d8461 ACM |
270 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
271 | np->opt->opt_nflen); | |
1da177e4 LT |
272 | |
273 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
274 | ||
c720c7e8 | 275 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
276 | |
277 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 278 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
279 | if (err) |
280 | goto late_failure; | |
281 | ||
9e7ceb06 SP |
282 | ip6_set_txhash(sk); |
283 | ||
2b916477 | 284 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 285 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 286 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
287 | inet->inet_sport, |
288 | inet->inet_dport); | |
1da177e4 LT |
289 | |
290 | err = tcp_connect(sk); | |
291 | if (err) | |
292 | goto late_failure; | |
293 | ||
294 | return 0; | |
295 | ||
296 | late_failure: | |
297 | tcp_set_state(sk, TCP_CLOSE); | |
298 | __sk_dst_reset(sk); | |
299 | failure: | |
c720c7e8 | 300 | inet->inet_dport = 0; |
1da177e4 LT |
301 | sk->sk_route_caps = 0; |
302 | return err; | |
303 | } | |
304 | ||
563d34d0 ED |
305 | static void tcp_v6_mtu_reduced(struct sock *sk) |
306 | { | |
307 | struct dst_entry *dst; | |
308 | ||
309 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
310 | return; | |
311 | ||
312 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
313 | if (!dst) | |
314 | return; | |
315 | ||
316 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
317 | tcp_sync_mss(sk, dst_mtu(dst)); | |
318 | tcp_simple_retransmit(sk); | |
319 | } | |
320 | } | |
321 | ||
1da177e4 | 322 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 323 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 324 | { |
4c99aa40 | 325 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 326 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
327 | struct net *net = dev_net(skb->dev); |
328 | struct request_sock *fastopen; | |
1da177e4 | 329 | struct ipv6_pinfo *np; |
1ab1457c | 330 | struct tcp_sock *tp; |
0a672f74 | 331 | __u32 seq, snd_una; |
2215089b ED |
332 | struct sock *sk; |
333 | int err; | |
1da177e4 | 334 | |
2215089b ED |
335 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
336 | &hdr->daddr, th->dest, | |
337 | &hdr->saddr, ntohs(th->source), | |
338 | skb->dev->ifindex); | |
1da177e4 | 339 | |
2215089b | 340 | if (!sk) { |
e41b5368 DL |
341 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
342 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
343 | return; |
344 | } | |
345 | ||
346 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 347 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
348 | return; |
349 | } | |
2215089b ED |
350 | seq = ntohl(th->seq); |
351 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
352 | return tcp_req_err(sk, seq); | |
1da177e4 LT |
353 | |
354 | bh_lock_sock(sk); | |
563d34d0 | 355 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 356 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
357 | |
358 | if (sk->sk_state == TCP_CLOSE) | |
359 | goto out; | |
360 | ||
e802af9c SH |
361 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
362 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
363 | goto out; | |
364 | } | |
365 | ||
1da177e4 | 366 | tp = tcp_sk(sk); |
0a672f74 YC |
367 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
368 | fastopen = tp->fastopen_rsk; | |
369 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 370 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 371 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 372 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
373 | goto out; |
374 | } | |
375 | ||
376 | np = inet6_sk(sk); | |
377 | ||
ec18d9a2 DM |
378 | if (type == NDISC_REDIRECT) { |
379 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
380 | ||
1ed5c48f | 381 | if (dst) |
6700c270 | 382 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 383 | goto out; |
ec18d9a2 DM |
384 | } |
385 | ||
1da177e4 | 386 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
387 | /* We are not interested in TCP_LISTEN and open_requests |
388 | * (SYN-ACKs send out by Linux are always <576bytes so | |
389 | * they should go through unfragmented). | |
390 | */ | |
391 | if (sk->sk_state == TCP_LISTEN) | |
392 | goto out; | |
393 | ||
93b36cf3 HFS |
394 | if (!ip6_sk_accept_pmtu(sk)) |
395 | goto out; | |
396 | ||
563d34d0 ED |
397 | tp->mtu_info = ntohl(info); |
398 | if (!sock_owned_by_user(sk)) | |
399 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
400 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
401 | &tp->tsq_flags)) | |
402 | sock_hold(sk); | |
1da177e4 LT |
403 | goto out; |
404 | } | |
405 | ||
406 | icmpv6_err_convert(type, code, &err); | |
407 | ||
60236fdd | 408 | /* Might be for an request_sock */ |
1da177e4 | 409 | switch (sk->sk_state) { |
1da177e4 | 410 | case TCP_SYN_SENT: |
0a672f74 YC |
411 | case TCP_SYN_RECV: |
412 | /* Only in fast or simultaneous open. If a fast open socket is | |
413 | * is already accepted it is treated as a connected one below. | |
414 | */ | |
415 | if (fastopen && fastopen->sk == NULL) | |
416 | break; | |
417 | ||
1da177e4 | 418 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
419 | sk->sk_err = err; |
420 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
421 | ||
422 | tcp_done(sk); | |
423 | } else | |
424 | sk->sk_err_soft = err; | |
425 | goto out; | |
426 | } | |
427 | ||
428 | if (!sock_owned_by_user(sk) && np->recverr) { | |
429 | sk->sk_err = err; | |
430 | sk->sk_error_report(sk); | |
431 | } else | |
432 | sk->sk_err_soft = err; | |
433 | ||
434 | out: | |
435 | bh_unlock_sock(sk); | |
436 | sock_put(sk); | |
437 | } | |
438 | ||
439 | ||
9f10d3f6 | 440 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 441 | struct flowi *fl, |
3840a06e | 442 | struct request_sock *req, |
3a19ce0e DL |
443 | u16 queue_mapping, |
444 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 445 | { |
634fb979 | 446 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 447 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 448 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 449 | struct sk_buff *skb; |
9494218f | 450 | int err = -ENOMEM; |
1da177e4 | 451 | |
9f10d3f6 NC |
452 | /* First, grab a route. */ |
453 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 454 | goto done; |
9494218f | 455 | |
3a19ce0e | 456 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 457 | |
1da177e4 | 458 | if (skb) { |
634fb979 ED |
459 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
460 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 461 | |
634fb979 | 462 | fl6->daddr = ireq->ir_v6_rmt_addr; |
df3687ff FF |
463 | if (np->repflow && (ireq->pktopts != NULL)) |
464 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
465 | ||
fff32699 | 466 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 467 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 468 | err = net_xmit_eval(err); |
1da177e4 LT |
469 | } |
470 | ||
471 | done: | |
1da177e4 LT |
472 | return err; |
473 | } | |
474 | ||
72659ecc | 475 | |
60236fdd | 476 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 477 | { |
634fb979 | 478 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
479 | } |
480 | ||
cfb6eeb4 YH |
481 | #ifdef CONFIG_TCP_MD5SIG |
482 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 483 | const struct in6_addr *addr) |
cfb6eeb4 | 484 | { |
a915da9b | 485 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
486 | } |
487 | ||
488 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
fd3a154a | 489 | const struct sock *addr_sk) |
cfb6eeb4 | 490 | { |
efe4208f | 491 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
492 | } |
493 | ||
4aa956d8 WY |
494 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
495 | int optlen) | |
cfb6eeb4 YH |
496 | { |
497 | struct tcp_md5sig cmd; | |
498 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
499 | |
500 | if (optlen < sizeof(cmd)) | |
501 | return -EINVAL; | |
502 | ||
503 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
504 | return -EFAULT; | |
505 | ||
506 | if (sin6->sin6_family != AF_INET6) | |
507 | return -EINVAL; | |
508 | ||
509 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 510 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
511 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
512 | AF_INET); | |
513 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
514 | AF_INET6); | |
cfb6eeb4 YH |
515 | } |
516 | ||
517 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
518 | return -EINVAL; | |
519 | ||
a915da9b ED |
520 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
521 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
522 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 523 | |
a915da9b ED |
524 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
525 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
526 | } |
527 | ||
49a72dfb | 528 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
529 | const struct in6_addr *daddr, |
530 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 531 | { |
cfb6eeb4 | 532 | struct tcp6_pseudohdr *bp; |
49a72dfb | 533 | struct scatterlist sg; |
8d26d76d | 534 | |
cfb6eeb4 | 535 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 536 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
537 | bp->saddr = *saddr; |
538 | bp->daddr = *daddr; | |
49a72dfb | 539 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 540 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 541 | |
49a72dfb AL |
542 | sg_init_one(&sg, bp, sizeof(*bp)); |
543 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
544 | } | |
c7da57a1 | 545 | |
49a72dfb | 546 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 547 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 548 | const struct tcphdr *th) |
49a72dfb AL |
549 | { |
550 | struct tcp_md5sig_pool *hp; | |
551 | struct hash_desc *desc; | |
552 | ||
553 | hp = tcp_get_md5sig_pool(); | |
554 | if (!hp) | |
555 | goto clear_hash_noput; | |
556 | desc = &hp->md5_desc; | |
557 | ||
558 | if (crypto_hash_init(desc)) | |
559 | goto clear_hash; | |
560 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
561 | goto clear_hash; | |
562 | if (tcp_md5_hash_header(hp, th)) | |
563 | goto clear_hash; | |
564 | if (tcp_md5_hash_key(hp, key)) | |
565 | goto clear_hash; | |
566 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 567 | goto clear_hash; |
cfb6eeb4 | 568 | |
cfb6eeb4 | 569 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 570 | return 0; |
49a72dfb | 571 | |
cfb6eeb4 YH |
572 | clear_hash: |
573 | tcp_put_md5sig_pool(); | |
574 | clear_hash_noput: | |
575 | memset(md5_hash, 0, 16); | |
49a72dfb | 576 | return 1; |
cfb6eeb4 YH |
577 | } |
578 | ||
39f8e58e ED |
579 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
580 | const struct tcp_md5sig_key *key, | |
318cf7aa | 581 | const struct sock *sk, |
318cf7aa | 582 | const struct sk_buff *skb) |
cfb6eeb4 | 583 | { |
b71d1d42 | 584 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
585 | struct tcp_md5sig_pool *hp; |
586 | struct hash_desc *desc; | |
318cf7aa | 587 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 588 | |
39f8e58e ED |
589 | if (sk) { /* valid for establish/request sockets */ |
590 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 591 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 592 | } else { |
b71d1d42 | 593 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
594 | saddr = &ip6h->saddr; |
595 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 596 | } |
49a72dfb AL |
597 | |
598 | hp = tcp_get_md5sig_pool(); | |
599 | if (!hp) | |
600 | goto clear_hash_noput; | |
601 | desc = &hp->md5_desc; | |
602 | ||
603 | if (crypto_hash_init(desc)) | |
604 | goto clear_hash; | |
605 | ||
606 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
607 | goto clear_hash; | |
608 | if (tcp_md5_hash_header(hp, th)) | |
609 | goto clear_hash; | |
610 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
611 | goto clear_hash; | |
612 | if (tcp_md5_hash_key(hp, key)) | |
613 | goto clear_hash; | |
614 | if (crypto_hash_final(desc, md5_hash)) | |
615 | goto clear_hash; | |
616 | ||
617 | tcp_put_md5sig_pool(); | |
618 | return 0; | |
619 | ||
620 | clear_hash: | |
621 | tcp_put_md5sig_pool(); | |
622 | clear_hash_noput: | |
623 | memset(md5_hash, 0, 16); | |
624 | return 1; | |
cfb6eeb4 YH |
625 | } |
626 | ||
ff74e23f | 627 | static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 628 | { |
cf533ea5 | 629 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 630 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 631 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 632 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 633 | int genhash; |
cfb6eeb4 YH |
634 | u8 newhash[16]; |
635 | ||
636 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 637 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 638 | |
785957d3 DM |
639 | /* We've parsed the options - do we have a hash? */ |
640 | if (!hash_expected && !hash_location) | |
ff74e23f | 641 | return false; |
785957d3 DM |
642 | |
643 | if (hash_expected && !hash_location) { | |
644 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
ff74e23f | 645 | return true; |
cfb6eeb4 YH |
646 | } |
647 | ||
785957d3 DM |
648 | if (!hash_expected && hash_location) { |
649 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
ff74e23f | 650 | return true; |
cfb6eeb4 YH |
651 | } |
652 | ||
653 | /* check the signature */ | |
49a72dfb AL |
654 | genhash = tcp_v6_md5_hash_skb(newhash, |
655 | hash_expected, | |
39f8e58e | 656 | NULL, skb); |
49a72dfb | 657 | |
cfb6eeb4 | 658 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
659 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
660 | genhash ? "failed" : "mismatch", | |
661 | &ip6h->saddr, ntohs(th->source), | |
662 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 663 | return true; |
cfb6eeb4 | 664 | } |
ff74e23f | 665 | return false; |
cfb6eeb4 YH |
666 | } |
667 | #endif | |
668 | ||
16bea70a OP |
669 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
670 | struct sk_buff *skb) | |
671 | { | |
672 | struct inet_request_sock *ireq = inet_rsk(req); | |
673 | struct ipv6_pinfo *np = inet6_sk(sk); | |
674 | ||
675 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
676 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
677 | ||
16bea70a OP |
678 | /* So that link locals have meaning */ |
679 | if (!sk->sk_bound_dev_if && | |
680 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
870c3151 | 681 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 682 | |
04317daf | 683 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
a224772d ED |
684 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
685 | np->rxopt.bits.rxinfo || | |
16bea70a OP |
686 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
687 | np->rxopt.bits.rxohlim || np->repflow)) { | |
688 | atomic_inc(&skb->users); | |
689 | ireq->pktopts = skb; | |
690 | } | |
691 | } | |
692 | ||
d94e0417 OP |
693 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
694 | const struct request_sock *req, | |
695 | bool *strict) | |
696 | { | |
697 | if (strict) | |
698 | *strict = true; | |
699 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
700 | } | |
701 | ||
c6aefafb | 702 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 703 | .family = AF_INET6, |
2e6599cb | 704 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 705 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
706 | .send_ack = tcp_v6_reqsk_send_ack, |
707 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 708 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 709 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
710 | }; |
711 | ||
b2e4b3de | 712 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
713 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
714 | sizeof(struct ipv6hdr), | |
16bea70a | 715 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 716 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 717 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 718 | #endif |
16bea70a | 719 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
720 | #ifdef CONFIG_SYN_COOKIES |
721 | .cookie_init_seq = cookie_v6_init_sequence, | |
722 | #endif | |
d94e0417 | 723 | .route_req = tcp_v6_route_req, |
936b8bdb | 724 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 725 | .send_synack = tcp_v6_send_synack, |
695da14e | 726 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 727 | }; |
cfb6eeb4 | 728 | |
0f85feae ED |
729 | static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq, |
730 | u32 ack, u32 win, u32 tsval, u32 tsecr, | |
731 | int oif, struct tcp_md5sig_key *key, int rst, | |
732 | u8 tclass, u32 label) | |
1da177e4 | 733 | { |
cf533ea5 ED |
734 | const struct tcphdr *th = tcp_hdr(skb); |
735 | struct tcphdr *t1; | |
1da177e4 | 736 | struct sk_buff *buff; |
4c9483b2 | 737 | struct flowi6 fl6; |
0f85feae | 738 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 739 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 740 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 741 | struct dst_entry *dst; |
81ada62d | 742 | __be32 *topt; |
1da177e4 | 743 | |
ee684b6f | 744 | if (tsecr) |
626e264d | 745 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 746 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
747 | if (key) |
748 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
749 | #endif | |
750 | ||
cfb6eeb4 | 751 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 752 | GFP_ATOMIC); |
1ab1457c YH |
753 | if (buff == NULL) |
754 | return; | |
1da177e4 | 755 | |
cfb6eeb4 | 756 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 757 | |
cfb6eeb4 | 758 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 759 | skb_reset_transport_header(buff); |
1da177e4 LT |
760 | |
761 | /* Swap the send and the receive. */ | |
762 | memset(t1, 0, sizeof(*t1)); | |
763 | t1->dest = th->source; | |
764 | t1->source = th->dest; | |
cfb6eeb4 | 765 | t1->doff = tot_len / 4; |
626e264d IJ |
766 | t1->seq = htonl(seq); |
767 | t1->ack_seq = htonl(ack); | |
768 | t1->ack = !rst || !th->ack; | |
769 | t1->rst = rst; | |
770 | t1->window = htons(win); | |
1da177e4 | 771 | |
81ada62d IJ |
772 | topt = (__be32 *)(t1 + 1); |
773 | ||
ee684b6f | 774 | if (tsecr) { |
626e264d IJ |
775 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
776 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
777 | *topt++ = htonl(tsval); |
778 | *topt++ = htonl(tsecr); | |
626e264d IJ |
779 | } |
780 | ||
cfb6eeb4 YH |
781 | #ifdef CONFIG_TCP_MD5SIG |
782 | if (key) { | |
81ada62d IJ |
783 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
784 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
785 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
786 | &ipv6_hdr(skb)->saddr, |
787 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
788 | } |
789 | #endif | |
790 | ||
4c9483b2 | 791 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
792 | fl6.daddr = ipv6_hdr(skb)->saddr; |
793 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 794 | fl6.flowlabel = label; |
1da177e4 | 795 | |
e5700aff DM |
796 | buff->ip_summed = CHECKSUM_PARTIAL; |
797 | buff->csum = 0; | |
798 | ||
4c9483b2 | 799 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 800 | |
4c9483b2 | 801 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 802 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 803 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
804 | else |
805 | fl6.flowi6_oif = oif; | |
e110861f | 806 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
807 | fl6.fl6_dport = t1->dest; |
808 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 809 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 810 | |
c20121ae DL |
811 | /* Pass a socket to ip6_dst_lookup either it is for RST |
812 | * Underlying function will use this to retrieve the network | |
813 | * namespace | |
814 | */ | |
0e0d44ab | 815 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
816 | if (!IS_ERR(dst)) { |
817 | skb_dst_set(buff, dst); | |
b903d324 | 818 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
819 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
820 | if (rst) | |
821 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
822 | return; | |
1da177e4 LT |
823 | } |
824 | ||
825 | kfree_skb(buff); | |
826 | } | |
827 | ||
626e264d | 828 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 829 | { |
cf533ea5 | 830 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 831 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 832 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
833 | #ifdef CONFIG_TCP_MD5SIG |
834 | const __u8 *hash_location = NULL; | |
835 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
836 | unsigned char newhash[16]; | |
837 | int genhash; | |
838 | struct sock *sk1 = NULL; | |
839 | #endif | |
9c76a114 | 840 | int oif; |
1da177e4 | 841 | |
626e264d | 842 | if (th->rst) |
1da177e4 LT |
843 | return; |
844 | ||
c3658e8d ED |
845 | /* If sk not NULL, it means we did a successful lookup and incoming |
846 | * route had to be correct. prequeue might have dropped our dst. | |
847 | */ | |
848 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 849 | return; |
1da177e4 | 850 | |
cfb6eeb4 | 851 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
852 | hash_location = tcp_parse_md5sig_option(th); |
853 | if (!sk && hash_location) { | |
854 | /* | |
855 | * active side is lost. Try to find listening socket through | |
856 | * source port, and then find md5 key through listening socket. | |
857 | * we are not loose security here: | |
858 | * Incoming packet is checked with md5 hash with finding key, | |
859 | * no RST generated if md5 hash doesn't match. | |
860 | */ | |
861 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
862 | &tcp_hashinfo, &ipv6h->saddr, |
863 | th->source, &ipv6h->daddr, | |
870c3151 | 864 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf SL |
865 | if (!sk1) |
866 | return; | |
867 | ||
868 | rcu_read_lock(); | |
869 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
870 | if (!key) | |
871 | goto release_sk1; | |
872 | ||
39f8e58e | 873 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf SL |
874 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
875 | goto release_sk1; | |
876 | } else { | |
877 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
878 | } | |
cfb6eeb4 YH |
879 | #endif |
880 | ||
626e264d IJ |
881 | if (th->ack) |
882 | seq = ntohl(th->ack_seq); | |
883 | else | |
884 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
885 | (th->doff << 2); | |
1da177e4 | 886 | |
9c76a114 | 887 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 888 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
889 | |
890 | #ifdef CONFIG_TCP_MD5SIG | |
891 | release_sk1: | |
892 | if (sk1) { | |
893 | rcu_read_unlock(); | |
894 | sock_put(sk1); | |
895 | } | |
896 | #endif | |
626e264d | 897 | } |
1da177e4 | 898 | |
0f85feae ED |
899 | static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq, |
900 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, | |
1d13a96c FF |
901 | struct tcp_md5sig_key *key, u8 tclass, |
902 | u32 label) | |
626e264d | 903 | { |
0f85feae ED |
904 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
905 | tclass, label); | |
1da177e4 LT |
906 | } |
907 | ||
908 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
909 | { | |
8feaf0c0 | 910 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 911 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 912 | |
0f85feae | 913 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 914 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 915 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 916 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 917 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 918 | |
8feaf0c0 | 919 | inet_twsk_put(tw); |
1da177e4 LT |
920 | } |
921 | ||
6edafaaf GJ |
922 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
923 | struct request_sock *req) | |
1da177e4 | 924 | { |
3a19ce0e DL |
925 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
926 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
927 | */ | |
0f85feae | 928 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 929 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
0f85feae ED |
930 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
931 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, | |
1d13a96c FF |
932 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
933 | 0, 0); | |
1da177e4 LT |
934 | } |
935 | ||
936 | ||
4c99aa40 | 937 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 938 | { |
aa8223c7 | 939 | const struct tcphdr *th = tcp_hdr(skb); |
52452c54 | 940 | struct request_sock *req; |
1da177e4 LT |
941 | struct sock *nsk; |
942 | ||
943 | /* Find possible connection requests. */ | |
52452c54 | 944 | req = inet6_csk_search_req(sk, th->source, |
0660e03f | 945 | &ipv6_hdr(skb)->saddr, |
870c3151 | 946 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
fa76ce73 ED |
947 | if (req) { |
948 | nsk = tcp_check_req(sk, skb, req, false); | |
949 | reqsk_put(req); | |
950 | return nsk; | |
951 | } | |
3b1e0a65 | 952 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
870c3151 ED |
953 | &ipv6_hdr(skb)->saddr, th->source, |
954 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
955 | tcp_v6_iif(skb)); | |
1da177e4 LT |
956 | |
957 | if (nsk) { | |
958 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
959 | bh_lock_sock(nsk); | |
960 | return nsk; | |
961 | } | |
9469c7b4 | 962 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
963 | return NULL; |
964 | } | |
965 | ||
c6aefafb | 966 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 967 | if (!th->syn) |
c6aefafb | 968 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
969 | #endif |
970 | return sk; | |
971 | } | |
972 | ||
1da177e4 LT |
973 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
974 | { | |
1da177e4 LT |
975 | if (skb->protocol == htons(ETH_P_IP)) |
976 | return tcp_v4_conn_request(sk, skb); | |
977 | ||
978 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 979 | goto drop; |
1da177e4 | 980 | |
1fb6f159 OP |
981 | return tcp_conn_request(&tcp6_request_sock_ops, |
982 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
983 | |
984 | drop: | |
5f1e942c | 985 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
986 | return 0; /* don't send reset */ |
987 | } | |
988 | ||
4c99aa40 WC |
989 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
990 | struct request_sock *req, | |
991 | struct dst_entry *dst) | |
1da177e4 | 992 | { |
634fb979 | 993 | struct inet_request_sock *ireq; |
1da177e4 LT |
994 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
995 | struct tcp6_sock *newtcp6sk; | |
996 | struct inet_sock *newinet; | |
997 | struct tcp_sock *newtp; | |
998 | struct sock *newsk; | |
cfb6eeb4 YH |
999 | #ifdef CONFIG_TCP_MD5SIG |
1000 | struct tcp_md5sig_key *key; | |
1001 | #endif | |
3840a06e | 1002 | struct flowi6 fl6; |
1da177e4 LT |
1003 | |
1004 | if (skb->protocol == htons(ETH_P_IP)) { | |
1005 | /* | |
1006 | * v6 mapped | |
1007 | */ | |
1008 | ||
1009 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1010 | ||
1ab1457c | 1011 | if (newsk == NULL) |
1da177e4 LT |
1012 | return NULL; |
1013 | ||
1014 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1015 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1016 | ||
1017 | newinet = inet_sk(newsk); | |
1018 | newnp = inet6_sk(newsk); | |
1019 | newtp = tcp_sk(newsk); | |
1020 | ||
1021 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1022 | ||
d1e559d0 | 1023 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1024 | |
8292a17a | 1025 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1026 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1027 | #ifdef CONFIG_TCP_MD5SIG |
1028 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1029 | #endif | |
1030 | ||
676a1184 YZ |
1031 | newnp->ipv6_ac_list = NULL; |
1032 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1033 | newnp->pktoptions = NULL; |
1034 | newnp->opt = NULL; | |
870c3151 | 1035 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1036 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1037 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1038 | if (np->repflow) |
1039 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1040 | |
e6848976 ACM |
1041 | /* |
1042 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1043 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1044 | * that function for the gory details. -acme | |
1da177e4 | 1045 | */ |
1da177e4 LT |
1046 | |
1047 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1048 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1049 | Sync it now. |
1050 | */ | |
d83d8461 | 1051 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1052 | |
1053 | return newsk; | |
1054 | } | |
1055 | ||
634fb979 | 1056 | ireq = inet_rsk(req); |
1da177e4 LT |
1057 | |
1058 | if (sk_acceptq_is_full(sk)) | |
1059 | goto out_overflow; | |
1060 | ||
493f377d | 1061 | if (!dst) { |
3840a06e | 1062 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1063 | if (!dst) |
1da177e4 | 1064 | goto out; |
1ab1457c | 1065 | } |
1da177e4 LT |
1066 | |
1067 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1068 | if (newsk == NULL) | |
093d2823 | 1069 | goto out_nonewsk; |
1da177e4 | 1070 | |
e6848976 ACM |
1071 | /* |
1072 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1073 | * count here, tcp_create_openreq_child now does this for us, see the | |
1074 | * comment in that function for the gory details. -acme | |
1075 | */ | |
1da177e4 | 1076 | |
59eed279 | 1077 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1078 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1079 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1080 | |
1081 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1082 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1083 | ||
1084 | newtp = tcp_sk(newsk); | |
1085 | newinet = inet_sk(newsk); | |
1086 | newnp = inet6_sk(newsk); | |
1087 | ||
1088 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1089 | ||
634fb979 ED |
1090 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1091 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1092 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1093 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1094 | |
b73c3d0e TH |
1095 | ip6_set_txhash(newsk); |
1096 | ||
1ab1457c | 1097 | /* Now IPv6 options... |
1da177e4 LT |
1098 | |
1099 | First: no IPv4 options. | |
1100 | */ | |
f6d8bd05 | 1101 | newinet->inet_opt = NULL; |
676a1184 | 1102 | newnp->ipv6_ac_list = NULL; |
d35690be | 1103 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1104 | |
1105 | /* Clone RX bits */ | |
1106 | newnp->rxopt.all = np->rxopt.all; | |
1107 | ||
1108 | /* Clone pktoptions received with SYN */ | |
1109 | newnp->pktoptions = NULL; | |
634fb979 ED |
1110 | if (ireq->pktopts != NULL) { |
1111 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1112 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1113 | consume_skb(ireq->pktopts); |
1114 | ireq->pktopts = NULL; | |
1da177e4 LT |
1115 | if (newnp->pktoptions) |
1116 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1117 | } | |
1118 | newnp->opt = NULL; | |
870c3151 | 1119 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1120 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1121 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1122 | if (np->repflow) |
1123 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1124 | |
1125 | /* Clone native IPv6 options from listening socket (if any) | |
1126 | ||
1127 | Yes, keeping reference count would be much more clever, | |
1128 | but we make one more one thing there: reattach optmem | |
1129 | to newsk. | |
1130 | */ | |
43264e0b RL |
1131 | if (np->opt) |
1132 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1133 | |
d83d8461 | 1134 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1135 | if (newnp->opt) |
d83d8461 ACM |
1136 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1137 | newnp->opt->opt_flen); | |
1da177e4 | 1138 | |
81164413 DB |
1139 | tcp_ca_openreq_child(newsk, dst); |
1140 | ||
1da177e4 | 1141 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1142 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1143 | if (tcp_sk(sk)->rx_opt.user_mss && |
1144 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1145 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1146 | ||
1da177e4 LT |
1147 | tcp_initialize_rcv_mss(newsk); |
1148 | ||
c720c7e8 ED |
1149 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1150 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1151 | |
cfb6eeb4 YH |
1152 | #ifdef CONFIG_TCP_MD5SIG |
1153 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1154 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1155 | if (key != NULL) { | |
cfb6eeb4 YH |
1156 | /* We're using one, so create a matching key |
1157 | * on the newsk structure. If we fail to get | |
1158 | * memory, then we end up not copying the key | |
1159 | * across. Shucks. | |
1160 | */ | |
efe4208f | 1161 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1162 | AF_INET6, key->key, key->keylen, |
1163 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1164 | } |
1165 | #endif | |
1166 | ||
093d2823 | 1167 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1168 | inet_csk_prepare_forced_close(newsk); |
1169 | tcp_done(newsk); | |
093d2823 BS |
1170 | goto out; |
1171 | } | |
77a6a471 | 1172 | __inet_hash(newsk, NULL); |
1da177e4 LT |
1173 | |
1174 | return newsk; | |
1175 | ||
1176 | out_overflow: | |
de0744af | 1177 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1178 | out_nonewsk: |
1da177e4 | 1179 | dst_release(dst); |
093d2823 BS |
1180 | out: |
1181 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1182 | return NULL; |
1183 | } | |
1184 | ||
1da177e4 LT |
1185 | /* The socket must have it's spinlock held when we get |
1186 | * here. | |
1187 | * | |
1188 | * We have a potential double-lock case here, so even when | |
1189 | * doing backlog processing we use the BH locking scheme. | |
1190 | * This is because we cannot sleep with the original spinlock | |
1191 | * held. | |
1192 | */ | |
1193 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1194 | { | |
1195 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1196 | struct tcp_sock *tp; | |
1197 | struct sk_buff *opt_skb = NULL; | |
1198 | ||
1199 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1200 | goes to IPv4 receive handler and backlogged. | |
1201 | From backlog it always goes here. Kerboom... | |
1202 | Fortunately, tcp_rcv_established and rcv_established | |
1203 | handle them correctly, but it is not case with | |
1204 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1205 | */ | |
1206 | ||
1207 | if (skb->protocol == htons(ETH_P_IP)) | |
1208 | return tcp_v4_do_rcv(sk, skb); | |
1209 | ||
fda9ef5d | 1210 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1211 | goto discard; |
1212 | ||
1213 | /* | |
1214 | * socket locking is here for SMP purposes as backlog rcv | |
1215 | * is currently called with bh processing disabled. | |
1216 | */ | |
1217 | ||
1218 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1219 | ||
1220 | Yes, guys, it is the only place in our code, where we | |
1221 | may make it not affecting IPv4. | |
1222 | The rest of code is protocol independent, | |
1223 | and I do not like idea to uglify IPv4. | |
1224 | ||
1225 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1226 | looks not very well thought. For now we latch | |
1227 | options, received in the last packet, enqueued | |
1228 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1229 | --ANK (980728) |
1da177e4 LT |
1230 | */ |
1231 | if (np->rxopt.all) | |
99a1dec7 | 1232 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1233 | |
1234 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1235 | struct dst_entry *dst = sk->sk_rx_dst; |
1236 | ||
bdeab991 | 1237 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1238 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1239 | if (dst) { |
1240 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1241 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1242 | dst_release(dst); | |
1243 | sk->sk_rx_dst = NULL; | |
1244 | } | |
1245 | } | |
1246 | ||
c995ae22 | 1247 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1248 | if (opt_skb) |
1249 | goto ipv6_pktoptions; | |
1250 | return 0; | |
1251 | } | |
1252 | ||
ab6a5bb6 | 1253 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1254 | goto csum_err; |
1255 | ||
1ab1457c | 1256 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1257 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1258 | if (!nsk) | |
1259 | goto discard; | |
1260 | ||
1261 | /* | |
1262 | * Queue it on the new socket if the new socket is active, | |
1263 | * otherwise we just shortcircuit this and continue with | |
1264 | * the new socket.. | |
1265 | */ | |
4c99aa40 | 1266 | if (nsk != sk) { |
bdeab991 | 1267 | sock_rps_save_rxhash(nsk, skb); |
3d97379a | 1268 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1269 | if (tcp_child_process(sk, nsk, skb)) |
1270 | goto reset; | |
1271 | if (opt_skb) | |
1272 | __kfree_skb(opt_skb); | |
1273 | return 0; | |
1274 | } | |
47482f13 | 1275 | } else |
bdeab991 | 1276 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1277 | |
aa8223c7 | 1278 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1279 | goto reset; |
1da177e4 LT |
1280 | if (opt_skb) |
1281 | goto ipv6_pktoptions; | |
1282 | return 0; | |
1283 | ||
1284 | reset: | |
cfb6eeb4 | 1285 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1286 | discard: |
1287 | if (opt_skb) | |
1288 | __kfree_skb(opt_skb); | |
1289 | kfree_skb(skb); | |
1290 | return 0; | |
1291 | csum_err: | |
6a5dc9e5 | 1292 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1293 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1294 | goto discard; |
1295 | ||
1296 | ||
1297 | ipv6_pktoptions: | |
1298 | /* Do you ask, what is it? | |
1299 | ||
1300 | 1. skb was enqueued by tcp. | |
1301 | 2. skb is added to tail of read queue, rather than out of order. | |
1302 | 3. socket is not in passive state. | |
1303 | 4. Finally, it really contains options, which user wants to receive. | |
1304 | */ | |
1305 | tp = tcp_sk(sk); | |
1306 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1307 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1308 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1309 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1310 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1311 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1312 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1313 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1314 | if (np->repflow) |
1315 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1316 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1317 | skb_set_owner_r(opt_skb, sk); |
1318 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1319 | } else { | |
1320 | __kfree_skb(opt_skb); | |
1321 | opt_skb = xchg(&np->pktoptions, NULL); | |
1322 | } | |
1323 | } | |
1324 | ||
800d55f1 | 1325 | kfree_skb(opt_skb); |
1da177e4 LT |
1326 | return 0; |
1327 | } | |
1328 | ||
2dc49d16 ND |
1329 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1330 | const struct tcphdr *th) | |
1331 | { | |
1332 | /* This is tricky: we move IP6CB at its correct location into | |
1333 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1334 | * _decode_session6() uses IP6CB(). | |
1335 | * barrier() makes sure compiler won't play aliasing games. | |
1336 | */ | |
1337 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1338 | sizeof(struct inet6_skb_parm)); | |
1339 | barrier(); | |
1340 | ||
1341 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1342 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1343 | skb->len - th->doff*4); | |
1344 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1345 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1346 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1347 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1348 | TCP_SKB_CB(skb)->sacked = 0; | |
1349 | } | |
1350 | ||
e5bbef20 | 1351 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1352 | { |
cf533ea5 | 1353 | const struct tcphdr *th; |
b71d1d42 | 1354 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1355 | struct sock *sk; |
1356 | int ret; | |
a86b1e30 | 1357 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1358 | |
1359 | if (skb->pkt_type != PACKET_HOST) | |
1360 | goto discard_it; | |
1361 | ||
1362 | /* | |
1363 | * Count it even if it's bad. | |
1364 | */ | |
63231bdd | 1365 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1366 | |
1367 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1368 | goto discard_it; | |
1369 | ||
aa8223c7 | 1370 | th = tcp_hdr(skb); |
1da177e4 LT |
1371 | |
1372 | if (th->doff < sizeof(struct tcphdr)/4) | |
1373 | goto bad_packet; | |
1374 | if (!pskb_may_pull(skb, th->doff*4)) | |
1375 | goto discard_it; | |
1376 | ||
e4f45b7f | 1377 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1378 | goto csum_error; |
1da177e4 | 1379 | |
aa8223c7 | 1380 | th = tcp_hdr(skb); |
e802af9c | 1381 | hdr = ipv6_hdr(skb); |
1da177e4 | 1382 | |
870c3151 | 1383 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1384 | inet6_iif(skb)); |
1da177e4 LT |
1385 | if (!sk) |
1386 | goto no_tcp_socket; | |
1387 | ||
1388 | process: | |
1389 | if (sk->sk_state == TCP_TIME_WAIT) | |
1390 | goto do_time_wait; | |
1391 | ||
e802af9c SH |
1392 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1393 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1394 | goto discard_and_relse; | |
1395 | } | |
1396 | ||
1da177e4 LT |
1397 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1398 | goto discard_and_relse; | |
1399 | ||
2dc49d16 ND |
1400 | tcp_v6_fill_cb(skb, hdr, th); |
1401 | ||
9ea88a15 DP |
1402 | #ifdef CONFIG_TCP_MD5SIG |
1403 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1404 | goto discard_and_relse; | |
1405 | #endif | |
1406 | ||
fda9ef5d | 1407 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1408 | goto discard_and_relse; |
1409 | ||
2c8c56e1 | 1410 | sk_incoming_cpu_update(sk); |
1da177e4 LT |
1411 | skb->dev = NULL; |
1412 | ||
293b9c42 | 1413 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1414 | ret = 0; |
1415 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1416 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1417 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1418 | } else if (unlikely(sk_add_backlog(sk, skb, |
1419 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1420 | bh_unlock_sock(sk); |
6cce09f8 | 1421 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1422 | goto discard_and_relse; |
1423 | } | |
1da177e4 LT |
1424 | bh_unlock_sock(sk); |
1425 | ||
1426 | sock_put(sk); | |
1427 | return ret ? -1 : 0; | |
1428 | ||
1429 | no_tcp_socket: | |
1430 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1431 | goto discard_it; | |
1432 | ||
2dc49d16 ND |
1433 | tcp_v6_fill_cb(skb, hdr, th); |
1434 | ||
1da177e4 | 1435 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1436 | csum_error: |
1437 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1438 | bad_packet: |
63231bdd | 1439 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1440 | } else { |
cfb6eeb4 | 1441 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1442 | } |
1443 | ||
1444 | discard_it: | |
1da177e4 LT |
1445 | kfree_skb(skb); |
1446 | return 0; | |
1447 | ||
1448 | discard_and_relse: | |
1449 | sock_put(sk); | |
1450 | goto discard_it; | |
1451 | ||
1452 | do_time_wait: | |
1453 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1454 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1455 | goto discard_it; |
1456 | } | |
1457 | ||
2dc49d16 ND |
1458 | tcp_v6_fill_cb(skb, hdr, th); |
1459 | ||
6a5dc9e5 | 1460 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1461 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1462 | goto bad_packet; |
1463 | } | |
1464 | if (tcp_checksum_complete(skb)) { | |
1465 | inet_twsk_put(inet_twsk(sk)); | |
1466 | goto csum_error; | |
1da177e4 LT |
1467 | } |
1468 | ||
9469c7b4 | 1469 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1470 | case TCP_TW_SYN: |
1471 | { | |
1472 | struct sock *sk2; | |
1473 | ||
c346dca1 | 1474 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1475 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1476 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1477 | ntohs(th->dest), tcp_v6_iif(skb)); |
1da177e4 | 1478 | if (sk2 != NULL) { |
295ff7ed ACM |
1479 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1480 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1481 | inet_twsk_put(tw); | |
1da177e4 LT |
1482 | sk = sk2; |
1483 | goto process; | |
1484 | } | |
1485 | /* Fall through to ACK */ | |
1486 | } | |
1487 | case TCP_TW_ACK: | |
1488 | tcp_v6_timewait_ack(sk, skb); | |
1489 | break; | |
1490 | case TCP_TW_RST: | |
1491 | goto no_tcp_socket; | |
4aa956d8 WY |
1492 | case TCP_TW_SUCCESS: |
1493 | ; | |
1da177e4 LT |
1494 | } |
1495 | goto discard_it; | |
1496 | } | |
1497 | ||
c7109986 ED |
1498 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1499 | { | |
1500 | const struct ipv6hdr *hdr; | |
1501 | const struct tcphdr *th; | |
1502 | struct sock *sk; | |
1503 | ||
1504 | if (skb->pkt_type != PACKET_HOST) | |
1505 | return; | |
1506 | ||
1507 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1508 | return; | |
1509 | ||
1510 | hdr = ipv6_hdr(skb); | |
1511 | th = tcp_hdr(skb); | |
1512 | ||
1513 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1514 | return; | |
1515 | ||
870c3151 | 1516 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1517 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1518 | &hdr->saddr, th->source, | |
1519 | &hdr->daddr, ntohs(th->dest), | |
1520 | inet6_iif(skb)); | |
1521 | if (sk) { | |
1522 | skb->sk = sk; | |
1523 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1524 | if (sk_fullsock(sk)) { |
c7109986 | 1525 | struct dst_entry *dst = sk->sk_rx_dst; |
f3f12135 | 1526 | |
c7109986 | 1527 | if (dst) |
5d299f3d | 1528 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1529 | if (dst && |
f3f12135 | 1530 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1531 | skb_dst_set_noref(skb, dst); |
1532 | } | |
1533 | } | |
1534 | } | |
1535 | ||
ccb7c410 DM |
1536 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1537 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1538 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1539 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1540 | }; |
1541 | ||
3b401a81 | 1542 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1543 | .queue_xmit = inet6_csk_xmit, |
1544 | .send_check = tcp_v6_send_check, | |
1545 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1546 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1547 | .conn_request = tcp_v6_conn_request, |
1548 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1549 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1550 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1551 | .setsockopt = ipv6_setsockopt, |
1552 | .getsockopt = ipv6_getsockopt, | |
1553 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1554 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1555 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1556 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1557 | .compat_setsockopt = compat_ipv6_setsockopt, |
1558 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1559 | #endif |
4fab9071 | 1560 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1561 | }; |
1562 | ||
cfb6eeb4 | 1563 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1564 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1565 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1566 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1567 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1568 | }; |
a928630a | 1569 | #endif |
cfb6eeb4 | 1570 | |
1da177e4 LT |
1571 | /* |
1572 | * TCP over IPv4 via INET6 API | |
1573 | */ | |
3b401a81 | 1574 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1575 | .queue_xmit = ip_queue_xmit, |
1576 | .send_check = tcp_v4_send_check, | |
1577 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1578 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1579 | .conn_request = tcp_v6_conn_request, |
1580 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1581 | .net_header_len = sizeof(struct iphdr), |
1582 | .setsockopt = ipv6_setsockopt, | |
1583 | .getsockopt = ipv6_getsockopt, | |
1584 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1585 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1586 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1587 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1588 | .compat_setsockopt = compat_ipv6_setsockopt, |
1589 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1590 | #endif |
4fab9071 | 1591 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1592 | }; |
1593 | ||
cfb6eeb4 | 1594 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1595 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1596 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1597 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1598 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1599 | }; |
a928630a | 1600 | #endif |
cfb6eeb4 | 1601 | |
1da177e4 LT |
1602 | /* NOTE: A lot of things set to zero explicitly by call to |
1603 | * sk_alloc() so need not be done here. | |
1604 | */ | |
1605 | static int tcp_v6_init_sock(struct sock *sk) | |
1606 | { | |
6687e988 | 1607 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1608 | |
900f65d3 | 1609 | tcp_init_sock(sk); |
1da177e4 | 1610 | |
8292a17a | 1611 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1612 | |
cfb6eeb4 | 1613 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1614 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1615 | #endif |
1616 | ||
1da177e4 LT |
1617 | return 0; |
1618 | } | |
1619 | ||
7d06b2e0 | 1620 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1621 | { |
1da177e4 | 1622 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1623 | inet6_destroy_sock(sk); |
1da177e4 LT |
1624 | } |
1625 | ||
952a10be | 1626 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1627 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1628 | static void get_openreq6(struct seq_file *seq, |
d4f06873 | 1629 | struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1630 | { |
fa76ce73 | 1631 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1632 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1633 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1634 | |
1635 | if (ttd < 0) | |
1636 | ttd = 0; | |
1637 | ||
1da177e4 LT |
1638 | seq_printf(seq, |
1639 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1640 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1641 | i, |
1642 | src->s6_addr32[0], src->s6_addr32[1], | |
1643 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1644 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1645 | dest->s6_addr32[0], dest->s6_addr32[1], |
1646 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1647 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1648 | TCP_SYN_RECV, |
4c99aa40 | 1649 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1650 | 1, /* timers active (only the expire timer) */ |
1651 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1652 | req->num_timeout, |
a7cb5a49 | 1653 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1654 | 0, /* non standard timer */ |
1da177e4 LT |
1655 | 0, /* open_requests have no inode */ |
1656 | 0, req); | |
1657 | } | |
1658 | ||
1659 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1660 | { | |
b71d1d42 | 1661 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1662 | __u16 destp, srcp; |
1663 | int timer_active; | |
1664 | unsigned long timer_expires; | |
cf533ea5 ED |
1665 | const struct inet_sock *inet = inet_sk(sp); |
1666 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1667 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1668 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1669 | |
efe4208f ED |
1670 | dest = &sp->sk_v6_daddr; |
1671 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1672 | destp = ntohs(inet->inet_dport); |
1673 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1674 | |
1675 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1676 | timer_active = 1; |
463c84b9 ACM |
1677 | timer_expires = icsk->icsk_timeout; |
1678 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1679 | timer_active = 4; |
463c84b9 | 1680 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1681 | } else if (timer_pending(&sp->sk_timer)) { |
1682 | timer_active = 2; | |
1683 | timer_expires = sp->sk_timer.expires; | |
1684 | } else { | |
1685 | timer_active = 0; | |
1686 | timer_expires = jiffies; | |
1687 | } | |
1688 | ||
1689 | seq_printf(seq, | |
1690 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1691 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1692 | i, |
1693 | src->s6_addr32[0], src->s6_addr32[1], | |
1694 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1695 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1696 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1697 | sp->sk_state, |
47da8ee6 SS |
1698 | tp->write_seq-tp->snd_una, |
1699 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1700 | timer_active, |
a399a805 | 1701 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1702 | icsk->icsk_retransmits, |
a7cb5a49 | 1703 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1704 | icsk->icsk_probes_out, |
1da177e4 LT |
1705 | sock_i_ino(sp), |
1706 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1707 | jiffies_to_clock_t(icsk->icsk_rto), |
1708 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1709 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1710 | tp->snd_cwnd, |
0a672f74 YC |
1711 | sp->sk_state == TCP_LISTEN ? |
1712 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1713 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1714 | ); |
1715 | } | |
1716 | ||
1ab1457c | 1717 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1718 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1719 | { |
b71d1d42 | 1720 | const struct in6_addr *dest, *src; |
1da177e4 | 1721 | __u16 destp, srcp; |
96f817fe | 1722 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1723 | |
efe4208f ED |
1724 | dest = &tw->tw_v6_daddr; |
1725 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1726 | destp = ntohs(tw->tw_dport); |
1727 | srcp = ntohs(tw->tw_sport); | |
1728 | ||
1729 | seq_printf(seq, | |
1730 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1731 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1732 | i, |
1733 | src->s6_addr32[0], src->s6_addr32[1], | |
1734 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1735 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1736 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1737 | tw->tw_substate, 0, 0, | |
a399a805 | 1738 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1739 | atomic_read(&tw->tw_refcnt), tw); |
1740 | } | |
1741 | ||
1da177e4 LT |
1742 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1743 | { | |
1744 | struct tcp_iter_state *st; | |
05dbc7b5 | 1745 | struct sock *sk = v; |
1da177e4 LT |
1746 | |
1747 | if (v == SEQ_START_TOKEN) { | |
1748 | seq_puts(seq, | |
1749 | " sl " | |
1750 | "local_address " | |
1751 | "remote_address " | |
1752 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1753 | " uid timeout inode\n"); | |
1754 | goto out; | |
1755 | } | |
1756 | st = seq->private; | |
1757 | ||
1758 | switch (st->state) { | |
1759 | case TCP_SEQ_STATE_LISTENING: | |
1760 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1761 | if (sk->sk_state == TCP_TIME_WAIT) |
1762 | get_timewait6_sock(seq, v, st->num); | |
1763 | else | |
1764 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1765 | break; |
1766 | case TCP_SEQ_STATE_OPENREQ: | |
d4f06873 | 1767 | get_openreq6(seq, v, st->num, st->uid); |
1da177e4 | 1768 | break; |
1da177e4 LT |
1769 | } |
1770 | out: | |
1771 | return 0; | |
1772 | } | |
1773 | ||
73cb88ec AV |
1774 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1775 | .owner = THIS_MODULE, | |
1776 | .open = tcp_seq_open, | |
1777 | .read = seq_read, | |
1778 | .llseek = seq_lseek, | |
1779 | .release = seq_release_net | |
1780 | }; | |
1781 | ||
1da177e4 | 1782 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1783 | .name = "tcp6", |
1784 | .family = AF_INET6, | |
73cb88ec | 1785 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1786 | .seq_ops = { |
1787 | .show = tcp6_seq_show, | |
1788 | }, | |
1da177e4 LT |
1789 | }; |
1790 | ||
2c8c1e72 | 1791 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1792 | { |
6f8b13bc | 1793 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1794 | } |
1795 | ||
6f8b13bc | 1796 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1797 | { |
6f8b13bc | 1798 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1799 | } |
1800 | #endif | |
1801 | ||
f77d6021 ED |
1802 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1803 | { | |
1804 | struct inet_sock *inet = inet_sk(sk); | |
1805 | ||
1806 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1807 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1808 | ||
1809 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1810 | memset(&inet->pinet6 + 1, 0, size); | |
1811 | } | |
1812 | ||
1da177e4 LT |
1813 | struct proto tcpv6_prot = { |
1814 | .name = "TCPv6", | |
1815 | .owner = THIS_MODULE, | |
1816 | .close = tcp_close, | |
1817 | .connect = tcp_v6_connect, | |
1818 | .disconnect = tcp_disconnect, | |
463c84b9 | 1819 | .accept = inet_csk_accept, |
1da177e4 LT |
1820 | .ioctl = tcp_ioctl, |
1821 | .init = tcp_v6_init_sock, | |
1822 | .destroy = tcp_v6_destroy_sock, | |
1823 | .shutdown = tcp_shutdown, | |
1824 | .setsockopt = tcp_setsockopt, | |
1825 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1826 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1827 | .sendmsg = tcp_sendmsg, |
1828 | .sendpage = tcp_sendpage, | |
1da177e4 | 1829 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1830 | .release_cb = tcp_release_cb, |
77a6a471 | 1831 | .hash = inet_hash, |
ab1e0a13 ACM |
1832 | .unhash = inet_unhash, |
1833 | .get_port = inet_csk_get_port, | |
1da177e4 | 1834 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1835 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1836 | .sockets_allocated = &tcp_sockets_allocated, |
1837 | .memory_allocated = &tcp_memory_allocated, | |
1838 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1839 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1840 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1841 | .sysctl_wmem = sysctl_tcp_wmem, |
1842 | .sysctl_rmem = sysctl_tcp_rmem, | |
1843 | .max_header = MAX_TCP_HEADER, | |
1844 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1845 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1846 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1847 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1848 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1849 | .no_autobind = true, |
543d9cfe ACM |
1850 | #ifdef CONFIG_COMPAT |
1851 | .compat_setsockopt = compat_tcp_setsockopt, | |
1852 | .compat_getsockopt = compat_tcp_getsockopt, | |
1853 | #endif | |
c255a458 | 1854 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1855 | .proto_cgroup = tcp_proto_cgroup, |
1856 | #endif | |
f77d6021 | 1857 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1858 | }; |
1859 | ||
41135cc8 | 1860 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1861 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1862 | .handler = tcp_v6_rcv, |
1863 | .err_handler = tcp_v6_err, | |
1864 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1865 | }; | |
1866 | ||
1da177e4 LT |
1867 | static struct inet_protosw tcpv6_protosw = { |
1868 | .type = SOCK_STREAM, | |
1869 | .protocol = IPPROTO_TCP, | |
1870 | .prot = &tcpv6_prot, | |
1871 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1872 | .flags = INET_PROTOSW_PERMANENT | |
1873 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1874 | }; |
1875 | ||
2c8c1e72 | 1876 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1877 | { |
5677242f DL |
1878 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1879 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1880 | } |
1881 | ||
2c8c1e72 | 1882 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1883 | { |
5677242f | 1884 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1885 | } |
1886 | ||
2c8c1e72 | 1887 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1888 | { |
1889 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1890 | } |
1891 | ||
1892 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1893 | .init = tcpv6_net_init, |
1894 | .exit = tcpv6_net_exit, | |
1895 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1896 | }; |
1897 | ||
7f4e4868 | 1898 | int __init tcpv6_init(void) |
1da177e4 | 1899 | { |
7f4e4868 DL |
1900 | int ret; |
1901 | ||
3336288a VY |
1902 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1903 | if (ret) | |
c6b641a4 | 1904 | goto out; |
3336288a | 1905 | |
1da177e4 | 1906 | /* register inet6 protocol */ |
7f4e4868 DL |
1907 | ret = inet6_register_protosw(&tcpv6_protosw); |
1908 | if (ret) | |
1909 | goto out_tcpv6_protocol; | |
1910 | ||
93ec926b | 1911 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1912 | if (ret) |
1913 | goto out_tcpv6_protosw; | |
1914 | out: | |
1915 | return ret; | |
ae0f7d5f | 1916 | |
7f4e4868 DL |
1917 | out_tcpv6_protosw: |
1918 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1919 | out_tcpv6_protocol: |
1920 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1921 | goto out; |
1922 | } | |
1923 | ||
09f7709f | 1924 | void tcpv6_exit(void) |
7f4e4868 | 1925 | { |
93ec926b | 1926 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1927 | inet6_unregister_protosw(&tcpv6_protosw); |
1928 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1929 | } |