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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
3d58b5fa | 62 | #include <net/inet_common.h> |
6e5714ea | 63 | #include <net/secure_seq.h> |
d1a4c0b3 | 64 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 65 | #include <net/busy_poll.h> |
1da177e4 | 66 | |
1da177e4 LT |
67 | #include <linux/proc_fs.h> |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
3b401a81 SH |
79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
84 | #else |
85 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 86 | const struct in6_addr *addr) |
9501f972 YH |
87 | { |
88 | return NULL; | |
89 | } | |
a928630a | 90 | #endif |
1da177e4 | 91 | |
fae6ef87 NC |
92 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
93 | { | |
94 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 95 | |
ca777eff ED |
96 | if (dst) { |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
b197df4f | 102 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); |
ca777eff | 103 | } |
fae6ef87 NC |
104 | } |
105 | ||
cf533ea5 | 106 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 107 | { |
0660e03f ACM |
108 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
109 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
110 | tcp_hdr(skb)->dest, |
111 | tcp_hdr(skb)->source); | |
1da177e4 LT |
112 | } |
113 | ||
1ab1457c | 114 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
115 | int addr_len) |
116 | { | |
117 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 118 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 119 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
120 | struct ipv6_pinfo *np = inet6_sk(sk); |
121 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 122 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 123 | struct rt6_info *rt; |
4c9483b2 | 124 | struct flowi6 fl6; |
1da177e4 LT |
125 | struct dst_entry *dst; |
126 | int addr_type; | |
127 | int err; | |
128 | ||
1ab1457c | 129 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
130 | return -EINVAL; |
131 | ||
1ab1457c | 132 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 133 | return -EAFNOSUPPORT; |
1da177e4 | 134 | |
4c9483b2 | 135 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
136 | |
137 | if (np->sndflow) { | |
4c9483b2 DM |
138 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
139 | IP6_ECN_flow_init(fl6.flowlabel); | |
140 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 141 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 142 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 143 | if (!flowlabel) |
1da177e4 | 144 | return -EINVAL; |
1da177e4 LT |
145 | fl6_sock_release(flowlabel); |
146 | } | |
147 | } | |
148 | ||
149 | /* | |
1ab1457c YH |
150 | * connect() to INADDR_ANY means loopback (BSD'ism). |
151 | */ | |
152 | ||
4c99aa40 | 153 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 154 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
155 | |
156 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
157 | ||
4c99aa40 | 158 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
159 | return -ENETUNREACH; |
160 | ||
161 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
162 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
163 | usin->sin6_scope_id) { | |
164 | /* If interface is set while binding, indices | |
165 | * must coincide. | |
166 | */ | |
167 | if (sk->sk_bound_dev_if && | |
168 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
169 | return -EINVAL; | |
170 | ||
171 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
172 | } | |
173 | ||
174 | /* Connect to link-local address requires an interface */ | |
175 | if (!sk->sk_bound_dev_if) | |
176 | return -EINVAL; | |
177 | } | |
178 | ||
179 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 180 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
181 | tp->rx_opt.ts_recent = 0; |
182 | tp->rx_opt.ts_recent_stamp = 0; | |
183 | tp->write_seq = 0; | |
184 | } | |
185 | ||
efe4208f | 186 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 187 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
188 | |
189 | /* | |
190 | * TCP over IPv4 | |
191 | */ | |
192 | ||
193 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 194 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
195 | struct sockaddr_in sin; |
196 | ||
197 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
198 | ||
199 | if (__ipv6_only_sock(sk)) | |
200 | return -ENETUNREACH; | |
201 | ||
202 | sin.sin_family = AF_INET; | |
203 | sin.sin_port = usin->sin6_port; | |
204 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
205 | ||
d83d8461 | 206 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 207 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
208 | #ifdef CONFIG_TCP_MD5SIG |
209 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
210 | #endif | |
1da177e4 LT |
211 | |
212 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
213 | ||
214 | if (err) { | |
d83d8461 ACM |
215 | icsk->icsk_ext_hdr_len = exthdrlen; |
216 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 217 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
218 | #ifdef CONFIG_TCP_MD5SIG |
219 | tp->af_specific = &tcp_sock_ipv6_specific; | |
220 | #endif | |
1da177e4 | 221 | goto failure; |
1da177e4 | 222 | } |
d1e559d0 | 223 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
224 | |
225 | return err; | |
226 | } | |
227 | ||
efe4208f ED |
228 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
229 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 230 | |
4c9483b2 | 231 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 232 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 233 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
234 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
235 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
236 | fl6.fl6_dport = usin->sin6_port; |
237 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 238 | |
4c9483b2 | 239 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 240 | |
4c9483b2 | 241 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 242 | |
0e0d44ab | 243 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
244 | if (IS_ERR(dst)) { |
245 | err = PTR_ERR(dst); | |
1da177e4 | 246 | goto failure; |
14e50e57 | 247 | } |
1da177e4 | 248 | |
63159f29 | 249 | if (!saddr) { |
4c9483b2 | 250 | saddr = &fl6.saddr; |
efe4208f | 251 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
252 | } |
253 | ||
254 | /* set the source address */ | |
4e3fd7a0 | 255 | np->saddr = *saddr; |
c720c7e8 | 256 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 257 | |
f83ef8c0 | 258 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 259 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 260 | |
493f377d DM |
261 | rt = (struct rt6_info *) dst; |
262 | if (tcp_death_row.sysctl_tw_recycle && | |
263 | !tp->rx_opt.ts_recent_stamp && | |
fd0273d7 | 264 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr)) |
81166dd6 | 265 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 266 | |
d83d8461 | 267 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 268 | if (np->opt) |
d83d8461 ACM |
269 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
270 | np->opt->opt_nflen); | |
1da177e4 LT |
271 | |
272 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
273 | ||
c720c7e8 | 274 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
275 | |
276 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 277 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
278 | if (err) |
279 | goto late_failure; | |
280 | ||
9e7ceb06 SP |
281 | ip6_set_txhash(sk); |
282 | ||
2b916477 | 283 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 284 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 285 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
286 | inet->inet_sport, |
287 | inet->inet_dport); | |
1da177e4 LT |
288 | |
289 | err = tcp_connect(sk); | |
290 | if (err) | |
291 | goto late_failure; | |
292 | ||
293 | return 0; | |
294 | ||
295 | late_failure: | |
296 | tcp_set_state(sk, TCP_CLOSE); | |
297 | __sk_dst_reset(sk); | |
298 | failure: | |
c720c7e8 | 299 | inet->inet_dport = 0; |
1da177e4 LT |
300 | sk->sk_route_caps = 0; |
301 | return err; | |
302 | } | |
303 | ||
563d34d0 ED |
304 | static void tcp_v6_mtu_reduced(struct sock *sk) |
305 | { | |
306 | struct dst_entry *dst; | |
307 | ||
308 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
309 | return; | |
310 | ||
311 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
312 | if (!dst) | |
313 | return; | |
314 | ||
315 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
316 | tcp_sync_mss(sk, dst_mtu(dst)); | |
317 | tcp_simple_retransmit(sk); | |
318 | } | |
319 | } | |
320 | ||
1da177e4 | 321 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 322 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 323 | { |
4c99aa40 | 324 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 325 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
326 | struct net *net = dev_net(skb->dev); |
327 | struct request_sock *fastopen; | |
1da177e4 | 328 | struct ipv6_pinfo *np; |
1ab1457c | 329 | struct tcp_sock *tp; |
0a672f74 | 330 | __u32 seq, snd_una; |
2215089b ED |
331 | struct sock *sk; |
332 | int err; | |
1da177e4 | 333 | |
2215089b ED |
334 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
335 | &hdr->daddr, th->dest, | |
336 | &hdr->saddr, ntohs(th->source), | |
337 | skb->dev->ifindex); | |
1da177e4 | 338 | |
2215089b | 339 | if (!sk) { |
e41b5368 DL |
340 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
341 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
342 | return; |
343 | } | |
344 | ||
345 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 346 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
347 | return; |
348 | } | |
2215089b ED |
349 | seq = ntohl(th->seq); |
350 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
351 | return tcp_req_err(sk, seq); | |
1da177e4 LT |
352 | |
353 | bh_lock_sock(sk); | |
563d34d0 | 354 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 355 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
356 | |
357 | if (sk->sk_state == TCP_CLOSE) | |
358 | goto out; | |
359 | ||
e802af9c SH |
360 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
361 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
362 | goto out; | |
363 | } | |
364 | ||
1da177e4 | 365 | tp = tcp_sk(sk); |
0a672f74 YC |
366 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
367 | fastopen = tp->fastopen_rsk; | |
368 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 369 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 370 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 371 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
372 | goto out; |
373 | } | |
374 | ||
375 | np = inet6_sk(sk); | |
376 | ||
ec18d9a2 DM |
377 | if (type == NDISC_REDIRECT) { |
378 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
379 | ||
1ed5c48f | 380 | if (dst) |
6700c270 | 381 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 382 | goto out; |
ec18d9a2 DM |
383 | } |
384 | ||
1da177e4 | 385 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
386 | /* We are not interested in TCP_LISTEN and open_requests |
387 | * (SYN-ACKs send out by Linux are always <576bytes so | |
388 | * they should go through unfragmented). | |
389 | */ | |
390 | if (sk->sk_state == TCP_LISTEN) | |
391 | goto out; | |
392 | ||
93b36cf3 HFS |
393 | if (!ip6_sk_accept_pmtu(sk)) |
394 | goto out; | |
395 | ||
563d34d0 ED |
396 | tp->mtu_info = ntohl(info); |
397 | if (!sock_owned_by_user(sk)) | |
398 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
399 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
400 | &tp->tsq_flags)) | |
401 | sock_hold(sk); | |
1da177e4 LT |
402 | goto out; |
403 | } | |
404 | ||
405 | icmpv6_err_convert(type, code, &err); | |
406 | ||
60236fdd | 407 | /* Might be for an request_sock */ |
1da177e4 | 408 | switch (sk->sk_state) { |
1da177e4 | 409 | case TCP_SYN_SENT: |
0a672f74 YC |
410 | case TCP_SYN_RECV: |
411 | /* Only in fast or simultaneous open. If a fast open socket is | |
412 | * is already accepted it is treated as a connected one below. | |
413 | */ | |
63159f29 | 414 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
415 | break; |
416 | ||
1da177e4 | 417 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
418 | sk->sk_err = err; |
419 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
420 | ||
421 | tcp_done(sk); | |
422 | } else | |
423 | sk->sk_err_soft = err; | |
424 | goto out; | |
425 | } | |
426 | ||
427 | if (!sock_owned_by_user(sk) && np->recverr) { | |
428 | sk->sk_err = err; | |
429 | sk->sk_error_report(sk); | |
430 | } else | |
431 | sk->sk_err_soft = err; | |
432 | ||
433 | out: | |
434 | bh_unlock_sock(sk); | |
435 | sock_put(sk); | |
436 | } | |
437 | ||
438 | ||
9f10d3f6 | 439 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 440 | struct flowi *fl, |
3840a06e | 441 | struct request_sock *req, |
3a19ce0e DL |
442 | u16 queue_mapping, |
443 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 444 | { |
634fb979 | 445 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 446 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 447 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 448 | struct sk_buff *skb; |
9494218f | 449 | int err = -ENOMEM; |
1da177e4 | 450 | |
9f10d3f6 NC |
451 | /* First, grab a route. */ |
452 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 453 | goto done; |
9494218f | 454 | |
3a19ce0e | 455 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 456 | |
1da177e4 | 457 | if (skb) { |
634fb979 ED |
458 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
459 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 460 | |
634fb979 | 461 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 462 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
463 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
464 | ||
fff32699 | 465 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 466 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 467 | err = net_xmit_eval(err); |
1da177e4 LT |
468 | } |
469 | ||
470 | done: | |
1da177e4 LT |
471 | return err; |
472 | } | |
473 | ||
72659ecc | 474 | |
60236fdd | 475 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 476 | { |
634fb979 | 477 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
478 | } |
479 | ||
cfb6eeb4 YH |
480 | #ifdef CONFIG_TCP_MD5SIG |
481 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 482 | const struct in6_addr *addr) |
cfb6eeb4 | 483 | { |
a915da9b | 484 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
485 | } |
486 | ||
487 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
fd3a154a | 488 | const struct sock *addr_sk) |
cfb6eeb4 | 489 | { |
efe4208f | 490 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
491 | } |
492 | ||
4aa956d8 WY |
493 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
494 | int optlen) | |
cfb6eeb4 YH |
495 | { |
496 | struct tcp_md5sig cmd; | |
497 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
498 | |
499 | if (optlen < sizeof(cmd)) | |
500 | return -EINVAL; | |
501 | ||
502 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
503 | return -EFAULT; | |
504 | ||
505 | if (sin6->sin6_family != AF_INET6) | |
506 | return -EINVAL; | |
507 | ||
508 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 509 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
510 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
511 | AF_INET); | |
512 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
513 | AF_INET6); | |
cfb6eeb4 YH |
514 | } |
515 | ||
516 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
517 | return -EINVAL; | |
518 | ||
a915da9b ED |
519 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
520 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
521 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 522 | |
a915da9b ED |
523 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
524 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
525 | } |
526 | ||
49a72dfb | 527 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
528 | const struct in6_addr *daddr, |
529 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 530 | { |
cfb6eeb4 | 531 | struct tcp6_pseudohdr *bp; |
49a72dfb | 532 | struct scatterlist sg; |
8d26d76d | 533 | |
cfb6eeb4 | 534 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 535 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
536 | bp->saddr = *saddr; |
537 | bp->daddr = *daddr; | |
49a72dfb | 538 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 539 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 540 | |
49a72dfb AL |
541 | sg_init_one(&sg, bp, sizeof(*bp)); |
542 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
543 | } | |
c7da57a1 | 544 | |
49a72dfb | 545 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 546 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 547 | const struct tcphdr *th) |
49a72dfb AL |
548 | { |
549 | struct tcp_md5sig_pool *hp; | |
550 | struct hash_desc *desc; | |
551 | ||
552 | hp = tcp_get_md5sig_pool(); | |
553 | if (!hp) | |
554 | goto clear_hash_noput; | |
555 | desc = &hp->md5_desc; | |
556 | ||
557 | if (crypto_hash_init(desc)) | |
558 | goto clear_hash; | |
559 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
560 | goto clear_hash; | |
561 | if (tcp_md5_hash_header(hp, th)) | |
562 | goto clear_hash; | |
563 | if (tcp_md5_hash_key(hp, key)) | |
564 | goto clear_hash; | |
565 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 566 | goto clear_hash; |
cfb6eeb4 | 567 | |
cfb6eeb4 | 568 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 569 | return 0; |
49a72dfb | 570 | |
cfb6eeb4 YH |
571 | clear_hash: |
572 | tcp_put_md5sig_pool(); | |
573 | clear_hash_noput: | |
574 | memset(md5_hash, 0, 16); | |
49a72dfb | 575 | return 1; |
cfb6eeb4 YH |
576 | } |
577 | ||
39f8e58e ED |
578 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
579 | const struct tcp_md5sig_key *key, | |
318cf7aa | 580 | const struct sock *sk, |
318cf7aa | 581 | const struct sk_buff *skb) |
cfb6eeb4 | 582 | { |
b71d1d42 | 583 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
584 | struct tcp_md5sig_pool *hp; |
585 | struct hash_desc *desc; | |
318cf7aa | 586 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 587 | |
39f8e58e ED |
588 | if (sk) { /* valid for establish/request sockets */ |
589 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 590 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 591 | } else { |
b71d1d42 | 592 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
593 | saddr = &ip6h->saddr; |
594 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 595 | } |
49a72dfb AL |
596 | |
597 | hp = tcp_get_md5sig_pool(); | |
598 | if (!hp) | |
599 | goto clear_hash_noput; | |
600 | desc = &hp->md5_desc; | |
601 | ||
602 | if (crypto_hash_init(desc)) | |
603 | goto clear_hash; | |
604 | ||
605 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
606 | goto clear_hash; | |
607 | if (tcp_md5_hash_header(hp, th)) | |
608 | goto clear_hash; | |
609 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
610 | goto clear_hash; | |
611 | if (tcp_md5_hash_key(hp, key)) | |
612 | goto clear_hash; | |
613 | if (crypto_hash_final(desc, md5_hash)) | |
614 | goto clear_hash; | |
615 | ||
616 | tcp_put_md5sig_pool(); | |
617 | return 0; | |
618 | ||
619 | clear_hash: | |
620 | tcp_put_md5sig_pool(); | |
621 | clear_hash_noput: | |
622 | memset(md5_hash, 0, 16); | |
623 | return 1; | |
cfb6eeb4 YH |
624 | } |
625 | ||
ff74e23f | 626 | static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 627 | { |
cf533ea5 | 628 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 629 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 630 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 631 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 632 | int genhash; |
cfb6eeb4 YH |
633 | u8 newhash[16]; |
634 | ||
635 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 636 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 637 | |
785957d3 DM |
638 | /* We've parsed the options - do we have a hash? */ |
639 | if (!hash_expected && !hash_location) | |
ff74e23f | 640 | return false; |
785957d3 DM |
641 | |
642 | if (hash_expected && !hash_location) { | |
643 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
ff74e23f | 644 | return true; |
cfb6eeb4 YH |
645 | } |
646 | ||
785957d3 DM |
647 | if (!hash_expected && hash_location) { |
648 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
ff74e23f | 649 | return true; |
cfb6eeb4 YH |
650 | } |
651 | ||
652 | /* check the signature */ | |
49a72dfb AL |
653 | genhash = tcp_v6_md5_hash_skb(newhash, |
654 | hash_expected, | |
39f8e58e | 655 | NULL, skb); |
49a72dfb | 656 | |
cfb6eeb4 | 657 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
658 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
659 | genhash ? "failed" : "mismatch", | |
660 | &ip6h->saddr, ntohs(th->source), | |
661 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 662 | return true; |
cfb6eeb4 | 663 | } |
ff74e23f | 664 | return false; |
cfb6eeb4 YH |
665 | } |
666 | #endif | |
667 | ||
16bea70a OP |
668 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
669 | struct sk_buff *skb) | |
670 | { | |
671 | struct inet_request_sock *ireq = inet_rsk(req); | |
672 | struct ipv6_pinfo *np = inet6_sk(sk); | |
673 | ||
674 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
675 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
676 | ||
16bea70a OP |
677 | /* So that link locals have meaning */ |
678 | if (!sk->sk_bound_dev_if && | |
679 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
870c3151 | 680 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 681 | |
04317daf | 682 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
a224772d ED |
683 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
684 | np->rxopt.bits.rxinfo || | |
16bea70a OP |
685 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
686 | np->rxopt.bits.rxohlim || np->repflow)) { | |
687 | atomic_inc(&skb->users); | |
688 | ireq->pktopts = skb; | |
689 | } | |
690 | } | |
691 | ||
d94e0417 OP |
692 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
693 | const struct request_sock *req, | |
694 | bool *strict) | |
695 | { | |
696 | if (strict) | |
697 | *strict = true; | |
698 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
699 | } | |
700 | ||
c6aefafb | 701 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 702 | .family = AF_INET6, |
2e6599cb | 703 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 704 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
705 | .send_ack = tcp_v6_reqsk_send_ack, |
706 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 707 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 708 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
709 | }; |
710 | ||
b2e4b3de | 711 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
712 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
713 | sizeof(struct ipv6hdr), | |
16bea70a | 714 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 715 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 716 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 717 | #endif |
16bea70a | 718 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
719 | #ifdef CONFIG_SYN_COOKIES |
720 | .cookie_init_seq = cookie_v6_init_sequence, | |
721 | #endif | |
d94e0417 | 722 | .route_req = tcp_v6_route_req, |
936b8bdb | 723 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 724 | .send_synack = tcp_v6_send_synack, |
695da14e | 725 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 726 | }; |
cfb6eeb4 | 727 | |
0f85feae ED |
728 | static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq, |
729 | u32 ack, u32 win, u32 tsval, u32 tsecr, | |
730 | int oif, struct tcp_md5sig_key *key, int rst, | |
731 | u8 tclass, u32 label) | |
1da177e4 | 732 | { |
cf533ea5 ED |
733 | const struct tcphdr *th = tcp_hdr(skb); |
734 | struct tcphdr *t1; | |
1da177e4 | 735 | struct sk_buff *buff; |
4c9483b2 | 736 | struct flowi6 fl6; |
0f85feae | 737 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 738 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 739 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 740 | struct dst_entry *dst; |
81ada62d | 741 | __be32 *topt; |
1da177e4 | 742 | |
ee684b6f | 743 | if (tsecr) |
626e264d | 744 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 745 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
746 | if (key) |
747 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
748 | #endif | |
749 | ||
cfb6eeb4 | 750 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 751 | GFP_ATOMIC); |
63159f29 | 752 | if (!buff) |
1ab1457c | 753 | return; |
1da177e4 | 754 | |
cfb6eeb4 | 755 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 756 | |
cfb6eeb4 | 757 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 758 | skb_reset_transport_header(buff); |
1da177e4 LT |
759 | |
760 | /* Swap the send and the receive. */ | |
761 | memset(t1, 0, sizeof(*t1)); | |
762 | t1->dest = th->source; | |
763 | t1->source = th->dest; | |
cfb6eeb4 | 764 | t1->doff = tot_len / 4; |
626e264d IJ |
765 | t1->seq = htonl(seq); |
766 | t1->ack_seq = htonl(ack); | |
767 | t1->ack = !rst || !th->ack; | |
768 | t1->rst = rst; | |
769 | t1->window = htons(win); | |
1da177e4 | 770 | |
81ada62d IJ |
771 | topt = (__be32 *)(t1 + 1); |
772 | ||
ee684b6f | 773 | if (tsecr) { |
626e264d IJ |
774 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
775 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
776 | *topt++ = htonl(tsval); |
777 | *topt++ = htonl(tsecr); | |
626e264d IJ |
778 | } |
779 | ||
cfb6eeb4 YH |
780 | #ifdef CONFIG_TCP_MD5SIG |
781 | if (key) { | |
81ada62d IJ |
782 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
783 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
784 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
785 | &ipv6_hdr(skb)->saddr, |
786 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
787 | } |
788 | #endif | |
789 | ||
4c9483b2 | 790 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
791 | fl6.daddr = ipv6_hdr(skb)->saddr; |
792 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 793 | fl6.flowlabel = label; |
1da177e4 | 794 | |
e5700aff DM |
795 | buff->ip_summed = CHECKSUM_PARTIAL; |
796 | buff->csum = 0; | |
797 | ||
4c9483b2 | 798 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 799 | |
4c9483b2 | 800 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 801 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 802 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
803 | else |
804 | fl6.flowi6_oif = oif; | |
e110861f | 805 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
806 | fl6.fl6_dport = t1->dest; |
807 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 808 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 809 | |
c20121ae DL |
810 | /* Pass a socket to ip6_dst_lookup either it is for RST |
811 | * Underlying function will use this to retrieve the network | |
812 | * namespace | |
813 | */ | |
0e0d44ab | 814 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
815 | if (!IS_ERR(dst)) { |
816 | skb_dst_set(buff, dst); | |
b903d324 | 817 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
818 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
819 | if (rst) | |
820 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
821 | return; | |
1da177e4 LT |
822 | } |
823 | ||
824 | kfree_skb(buff); | |
825 | } | |
826 | ||
626e264d | 827 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 828 | { |
cf533ea5 | 829 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 830 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 831 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
832 | #ifdef CONFIG_TCP_MD5SIG |
833 | const __u8 *hash_location = NULL; | |
834 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
835 | unsigned char newhash[16]; | |
836 | int genhash; | |
837 | struct sock *sk1 = NULL; | |
838 | #endif | |
9c76a114 | 839 | int oif; |
1da177e4 | 840 | |
626e264d | 841 | if (th->rst) |
1da177e4 LT |
842 | return; |
843 | ||
c3658e8d ED |
844 | /* If sk not NULL, it means we did a successful lookup and incoming |
845 | * route had to be correct. prequeue might have dropped our dst. | |
846 | */ | |
847 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 848 | return; |
1da177e4 | 849 | |
cfb6eeb4 | 850 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
851 | hash_location = tcp_parse_md5sig_option(th); |
852 | if (!sk && hash_location) { | |
853 | /* | |
854 | * active side is lost. Try to find listening socket through | |
855 | * source port, and then find md5 key through listening socket. | |
856 | * we are not loose security here: | |
857 | * Incoming packet is checked with md5 hash with finding key, | |
858 | * no RST generated if md5 hash doesn't match. | |
859 | */ | |
860 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
861 | &tcp_hashinfo, &ipv6h->saddr, |
862 | th->source, &ipv6h->daddr, | |
870c3151 | 863 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf SL |
864 | if (!sk1) |
865 | return; | |
866 | ||
867 | rcu_read_lock(); | |
868 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
869 | if (!key) | |
870 | goto release_sk1; | |
871 | ||
39f8e58e | 872 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf SL |
873 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
874 | goto release_sk1; | |
875 | } else { | |
876 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
877 | } | |
cfb6eeb4 YH |
878 | #endif |
879 | ||
626e264d IJ |
880 | if (th->ack) |
881 | seq = ntohl(th->ack_seq); | |
882 | else | |
883 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
884 | (th->doff << 2); | |
1da177e4 | 885 | |
9c76a114 | 886 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 887 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
888 | |
889 | #ifdef CONFIG_TCP_MD5SIG | |
890 | release_sk1: | |
891 | if (sk1) { | |
892 | rcu_read_unlock(); | |
893 | sock_put(sk1); | |
894 | } | |
895 | #endif | |
626e264d | 896 | } |
1da177e4 | 897 | |
0f85feae ED |
898 | static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq, |
899 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, | |
1d13a96c FF |
900 | struct tcp_md5sig_key *key, u8 tclass, |
901 | u32 label) | |
626e264d | 902 | { |
0f85feae ED |
903 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
904 | tclass, label); | |
1da177e4 LT |
905 | } |
906 | ||
907 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
908 | { | |
8feaf0c0 | 909 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 910 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 911 | |
0f85feae | 912 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 913 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 914 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 915 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 916 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 917 | |
8feaf0c0 | 918 | inet_twsk_put(tw); |
1da177e4 LT |
919 | } |
920 | ||
6edafaaf GJ |
921 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
922 | struct request_sock *req) | |
1da177e4 | 923 | { |
3a19ce0e DL |
924 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
925 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
926 | */ | |
0f85feae | 927 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 928 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
0f85feae ED |
929 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
930 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, | |
1d13a96c FF |
931 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
932 | 0, 0); | |
1da177e4 LT |
933 | } |
934 | ||
935 | ||
4c99aa40 | 936 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 937 | { |
aa8223c7 | 938 | const struct tcphdr *th = tcp_hdr(skb); |
52452c54 | 939 | struct request_sock *req; |
1da177e4 LT |
940 | struct sock *nsk; |
941 | ||
942 | /* Find possible connection requests. */ | |
52452c54 | 943 | req = inet6_csk_search_req(sk, th->source, |
0660e03f | 944 | &ipv6_hdr(skb)->saddr, |
870c3151 | 945 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
fa76ce73 ED |
946 | if (req) { |
947 | nsk = tcp_check_req(sk, skb, req, false); | |
b357a364 ED |
948 | if (!nsk) |
949 | reqsk_put(req); | |
fa76ce73 ED |
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 | ||
63159f29 | 1011 | if (!newsk) |
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); | |
63159f29 | 1068 | if (!newsk) |
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; | |
53b24b8f | 1110 | if (ireq->pktopts) { |
634fb979 | 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 | 1154 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1155 | if (key) { |
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 | ||
4ad19de8 AK |
1351 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1352 | { | |
1353 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1354 | * and tcp_v6_fill_cb() are going to be called again. | |
1355 | */ | |
1356 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1357 | sizeof(struct inet6_skb_parm)); | |
1358 | } | |
1359 | ||
e5bbef20 | 1360 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1361 | { |
cf533ea5 | 1362 | const struct tcphdr *th; |
b71d1d42 | 1363 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1364 | struct sock *sk; |
1365 | int ret; | |
a86b1e30 | 1366 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1367 | |
1368 | if (skb->pkt_type != PACKET_HOST) | |
1369 | goto discard_it; | |
1370 | ||
1371 | /* | |
1372 | * Count it even if it's bad. | |
1373 | */ | |
63231bdd | 1374 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1375 | |
1376 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1377 | goto discard_it; | |
1378 | ||
aa8223c7 | 1379 | th = tcp_hdr(skb); |
1da177e4 LT |
1380 | |
1381 | if (th->doff < sizeof(struct tcphdr)/4) | |
1382 | goto bad_packet; | |
1383 | if (!pskb_may_pull(skb, th->doff*4)) | |
1384 | goto discard_it; | |
1385 | ||
e4f45b7f | 1386 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1387 | goto csum_error; |
1da177e4 | 1388 | |
aa8223c7 | 1389 | th = tcp_hdr(skb); |
e802af9c | 1390 | hdr = ipv6_hdr(skb); |
1da177e4 | 1391 | |
870c3151 | 1392 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1393 | inet6_iif(skb)); |
1da177e4 LT |
1394 | if (!sk) |
1395 | goto no_tcp_socket; | |
1396 | ||
1397 | process: | |
1398 | if (sk->sk_state == TCP_TIME_WAIT) | |
1399 | goto do_time_wait; | |
1400 | ||
e802af9c SH |
1401 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1402 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1403 | goto discard_and_relse; | |
1404 | } | |
1405 | ||
1da177e4 LT |
1406 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1407 | goto discard_and_relse; | |
1408 | ||
2dc49d16 ND |
1409 | tcp_v6_fill_cb(skb, hdr, th); |
1410 | ||
9ea88a15 DP |
1411 | #ifdef CONFIG_TCP_MD5SIG |
1412 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1413 | goto discard_and_relse; | |
1414 | #endif | |
1415 | ||
fda9ef5d | 1416 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1417 | goto discard_and_relse; |
1418 | ||
2c8c56e1 | 1419 | sk_incoming_cpu_update(sk); |
1da177e4 LT |
1420 | skb->dev = NULL; |
1421 | ||
293b9c42 | 1422 | bh_lock_sock_nested(sk); |
2efd055c | 1423 | tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
1da177e4 LT |
1424 | ret = 0; |
1425 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1426 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1427 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1428 | } else if (unlikely(sk_add_backlog(sk, skb, |
1429 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1430 | bh_unlock_sock(sk); |
6cce09f8 | 1431 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1432 | goto discard_and_relse; |
1433 | } | |
1da177e4 LT |
1434 | bh_unlock_sock(sk); |
1435 | ||
1436 | sock_put(sk); | |
1437 | return ret ? -1 : 0; | |
1438 | ||
1439 | no_tcp_socket: | |
1440 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1441 | goto discard_it; | |
1442 | ||
2dc49d16 ND |
1443 | tcp_v6_fill_cb(skb, hdr, th); |
1444 | ||
1da177e4 | 1445 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1446 | csum_error: |
1447 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1448 | bad_packet: |
63231bdd | 1449 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1450 | } else { |
cfb6eeb4 | 1451 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | discard_it: | |
1da177e4 LT |
1455 | kfree_skb(skb); |
1456 | return 0; | |
1457 | ||
1458 | discard_and_relse: | |
1459 | sock_put(sk); | |
1460 | goto discard_it; | |
1461 | ||
1462 | do_time_wait: | |
1463 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1464 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1465 | goto discard_it; |
1466 | } | |
1467 | ||
2dc49d16 ND |
1468 | tcp_v6_fill_cb(skb, hdr, th); |
1469 | ||
6a5dc9e5 | 1470 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1471 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1472 | goto bad_packet; |
1473 | } | |
1474 | if (tcp_checksum_complete(skb)) { | |
1475 | inet_twsk_put(inet_twsk(sk)); | |
1476 | goto csum_error; | |
1da177e4 LT |
1477 | } |
1478 | ||
9469c7b4 | 1479 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1480 | case TCP_TW_SYN: |
1481 | { | |
1482 | struct sock *sk2; | |
1483 | ||
c346dca1 | 1484 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1485 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1486 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1487 | ntohs(th->dest), tcp_v6_iif(skb)); |
53b24b8f | 1488 | if (sk2) { |
295ff7ed | 1489 | struct inet_timewait_sock *tw = inet_twsk(sk); |
789f558c | 1490 | inet_twsk_deschedule(tw); |
295ff7ed | 1491 | inet_twsk_put(tw); |
1da177e4 | 1492 | sk = sk2; |
4ad19de8 | 1493 | tcp_v6_restore_cb(skb); |
1da177e4 LT |
1494 | goto process; |
1495 | } | |
1496 | /* Fall through to ACK */ | |
1497 | } | |
1498 | case TCP_TW_ACK: | |
1499 | tcp_v6_timewait_ack(sk, skb); | |
1500 | break; | |
1501 | case TCP_TW_RST: | |
4ad19de8 | 1502 | tcp_v6_restore_cb(skb); |
1da177e4 | 1503 | goto no_tcp_socket; |
4aa956d8 WY |
1504 | case TCP_TW_SUCCESS: |
1505 | ; | |
1da177e4 LT |
1506 | } |
1507 | goto discard_it; | |
1508 | } | |
1509 | ||
c7109986 ED |
1510 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1511 | { | |
1512 | const struct ipv6hdr *hdr; | |
1513 | const struct tcphdr *th; | |
1514 | struct sock *sk; | |
1515 | ||
1516 | if (skb->pkt_type != PACKET_HOST) | |
1517 | return; | |
1518 | ||
1519 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1520 | return; | |
1521 | ||
1522 | hdr = ipv6_hdr(skb); | |
1523 | th = tcp_hdr(skb); | |
1524 | ||
1525 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1526 | return; | |
1527 | ||
870c3151 | 1528 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1529 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1530 | &hdr->saddr, th->source, | |
1531 | &hdr->daddr, ntohs(th->dest), | |
1532 | inet6_iif(skb)); | |
1533 | if (sk) { | |
1534 | skb->sk = sk; | |
1535 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1536 | if (sk_fullsock(sk)) { |
d0c294c5 | 1537 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1538 | |
c7109986 | 1539 | if (dst) |
5d299f3d | 1540 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1541 | if (dst && |
f3f12135 | 1542 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1543 | skb_dst_set_noref(skb, dst); |
1544 | } | |
1545 | } | |
1546 | } | |
1547 | ||
ccb7c410 DM |
1548 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1549 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1550 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1551 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1552 | }; |
1553 | ||
3b401a81 | 1554 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1555 | .queue_xmit = inet6_csk_xmit, |
1556 | .send_check = tcp_v6_send_check, | |
1557 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1558 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1559 | .conn_request = tcp_v6_conn_request, |
1560 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1561 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1562 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1563 | .setsockopt = ipv6_setsockopt, |
1564 | .getsockopt = ipv6_getsockopt, | |
1565 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1566 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1567 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1568 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1569 | .compat_setsockopt = compat_ipv6_setsockopt, |
1570 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1571 | #endif |
4fab9071 | 1572 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1573 | }; |
1574 | ||
cfb6eeb4 | 1575 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1576 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1577 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1578 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1579 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1580 | }; |
a928630a | 1581 | #endif |
cfb6eeb4 | 1582 | |
1da177e4 LT |
1583 | /* |
1584 | * TCP over IPv4 via INET6 API | |
1585 | */ | |
3b401a81 | 1586 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1587 | .queue_xmit = ip_queue_xmit, |
1588 | .send_check = tcp_v4_send_check, | |
1589 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1590 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1591 | .conn_request = tcp_v6_conn_request, |
1592 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1593 | .net_header_len = sizeof(struct iphdr), |
1594 | .setsockopt = ipv6_setsockopt, | |
1595 | .getsockopt = ipv6_getsockopt, | |
1596 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1597 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1598 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1599 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1600 | .compat_setsockopt = compat_ipv6_setsockopt, |
1601 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1602 | #endif |
4fab9071 | 1603 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1604 | }; |
1605 | ||
cfb6eeb4 | 1606 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1607 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1608 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1609 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1610 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1611 | }; |
a928630a | 1612 | #endif |
cfb6eeb4 | 1613 | |
1da177e4 LT |
1614 | /* NOTE: A lot of things set to zero explicitly by call to |
1615 | * sk_alloc() so need not be done here. | |
1616 | */ | |
1617 | static int tcp_v6_init_sock(struct sock *sk) | |
1618 | { | |
6687e988 | 1619 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1620 | |
900f65d3 | 1621 | tcp_init_sock(sk); |
1da177e4 | 1622 | |
8292a17a | 1623 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1624 | |
cfb6eeb4 | 1625 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1626 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1627 | #endif |
1628 | ||
1da177e4 LT |
1629 | return 0; |
1630 | } | |
1631 | ||
7d06b2e0 | 1632 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1633 | { |
1da177e4 | 1634 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1635 | inet6_destroy_sock(sk); |
1da177e4 LT |
1636 | } |
1637 | ||
952a10be | 1638 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1639 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1640 | static void get_openreq6(struct seq_file *seq, |
d4f06873 | 1641 | struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1642 | { |
fa76ce73 | 1643 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1644 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1645 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1646 | |
1647 | if (ttd < 0) | |
1648 | ttd = 0; | |
1649 | ||
1da177e4 LT |
1650 | seq_printf(seq, |
1651 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1652 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1653 | i, |
1654 | src->s6_addr32[0], src->s6_addr32[1], | |
1655 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1656 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1657 | dest->s6_addr32[0], dest->s6_addr32[1], |
1658 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1659 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1660 | TCP_SYN_RECV, |
4c99aa40 | 1661 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1662 | 1, /* timers active (only the expire timer) */ |
1663 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1664 | req->num_timeout, |
a7cb5a49 | 1665 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1666 | 0, /* non standard timer */ |
1da177e4 LT |
1667 | 0, /* open_requests have no inode */ |
1668 | 0, req); | |
1669 | } | |
1670 | ||
1671 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1672 | { | |
b71d1d42 | 1673 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1674 | __u16 destp, srcp; |
1675 | int timer_active; | |
1676 | unsigned long timer_expires; | |
cf533ea5 ED |
1677 | const struct inet_sock *inet = inet_sk(sp); |
1678 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1679 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1680 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1681 | |
efe4208f ED |
1682 | dest = &sp->sk_v6_daddr; |
1683 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1684 | destp = ntohs(inet->inet_dport); |
1685 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1686 | |
1687 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1688 | timer_active = 1; |
463c84b9 ACM |
1689 | timer_expires = icsk->icsk_timeout; |
1690 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1691 | timer_active = 4; |
463c84b9 | 1692 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1693 | } else if (timer_pending(&sp->sk_timer)) { |
1694 | timer_active = 2; | |
1695 | timer_expires = sp->sk_timer.expires; | |
1696 | } else { | |
1697 | timer_active = 0; | |
1698 | timer_expires = jiffies; | |
1699 | } | |
1700 | ||
1701 | seq_printf(seq, | |
1702 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1703 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1704 | i, |
1705 | src->s6_addr32[0], src->s6_addr32[1], | |
1706 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1707 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1708 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1709 | sp->sk_state, |
47da8ee6 SS |
1710 | tp->write_seq-tp->snd_una, |
1711 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1712 | timer_active, |
a399a805 | 1713 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1714 | icsk->icsk_retransmits, |
a7cb5a49 | 1715 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1716 | icsk->icsk_probes_out, |
1da177e4 LT |
1717 | sock_i_ino(sp), |
1718 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1719 | jiffies_to_clock_t(icsk->icsk_rto), |
1720 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1721 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1722 | tp->snd_cwnd, |
0a672f74 YC |
1723 | sp->sk_state == TCP_LISTEN ? |
1724 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1725 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1726 | ); |
1727 | } | |
1728 | ||
1ab1457c | 1729 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1730 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1731 | { |
789f558c | 1732 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1733 | const struct in6_addr *dest, *src; |
1da177e4 | 1734 | __u16 destp, srcp; |
1da177e4 | 1735 | |
efe4208f ED |
1736 | dest = &tw->tw_v6_daddr; |
1737 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1738 | destp = ntohs(tw->tw_dport); |
1739 | srcp = ntohs(tw->tw_sport); | |
1740 | ||
1741 | seq_printf(seq, | |
1742 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1743 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1744 | i, |
1745 | src->s6_addr32[0], src->s6_addr32[1], | |
1746 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1747 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1748 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1749 | tw->tw_substate, 0, 0, | |
a399a805 | 1750 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1751 | atomic_read(&tw->tw_refcnt), tw); |
1752 | } | |
1753 | ||
1da177e4 LT |
1754 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1755 | { | |
1756 | struct tcp_iter_state *st; | |
05dbc7b5 | 1757 | struct sock *sk = v; |
1da177e4 LT |
1758 | |
1759 | if (v == SEQ_START_TOKEN) { | |
1760 | seq_puts(seq, | |
1761 | " sl " | |
1762 | "local_address " | |
1763 | "remote_address " | |
1764 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1765 | " uid timeout inode\n"); | |
1766 | goto out; | |
1767 | } | |
1768 | st = seq->private; | |
1769 | ||
1770 | switch (st->state) { | |
1771 | case TCP_SEQ_STATE_LISTENING: | |
1772 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1773 | if (sk->sk_state == TCP_TIME_WAIT) |
1774 | get_timewait6_sock(seq, v, st->num); | |
1775 | else | |
1776 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1777 | break; |
1778 | case TCP_SEQ_STATE_OPENREQ: | |
d4f06873 | 1779 | get_openreq6(seq, v, st->num, st->uid); |
1da177e4 | 1780 | break; |
1da177e4 LT |
1781 | } |
1782 | out: | |
1783 | return 0; | |
1784 | } | |
1785 | ||
73cb88ec AV |
1786 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1787 | .owner = THIS_MODULE, | |
1788 | .open = tcp_seq_open, | |
1789 | .read = seq_read, | |
1790 | .llseek = seq_lseek, | |
1791 | .release = seq_release_net | |
1792 | }; | |
1793 | ||
1da177e4 | 1794 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1795 | .name = "tcp6", |
1796 | .family = AF_INET6, | |
73cb88ec | 1797 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1798 | .seq_ops = { |
1799 | .show = tcp6_seq_show, | |
1800 | }, | |
1da177e4 LT |
1801 | }; |
1802 | ||
2c8c1e72 | 1803 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1804 | { |
6f8b13bc | 1805 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1806 | } |
1807 | ||
6f8b13bc | 1808 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1809 | { |
6f8b13bc | 1810 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1811 | } |
1812 | #endif | |
1813 | ||
f77d6021 ED |
1814 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1815 | { | |
1816 | struct inet_sock *inet = inet_sk(sk); | |
1817 | ||
1818 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1819 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1820 | ||
1821 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1822 | memset(&inet->pinet6 + 1, 0, size); | |
1823 | } | |
1824 | ||
1da177e4 LT |
1825 | struct proto tcpv6_prot = { |
1826 | .name = "TCPv6", | |
1827 | .owner = THIS_MODULE, | |
1828 | .close = tcp_close, | |
1829 | .connect = tcp_v6_connect, | |
1830 | .disconnect = tcp_disconnect, | |
463c84b9 | 1831 | .accept = inet_csk_accept, |
1da177e4 LT |
1832 | .ioctl = tcp_ioctl, |
1833 | .init = tcp_v6_init_sock, | |
1834 | .destroy = tcp_v6_destroy_sock, | |
1835 | .shutdown = tcp_shutdown, | |
1836 | .setsockopt = tcp_setsockopt, | |
1837 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1838 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1839 | .sendmsg = tcp_sendmsg, |
1840 | .sendpage = tcp_sendpage, | |
1da177e4 | 1841 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1842 | .release_cb = tcp_release_cb, |
77a6a471 | 1843 | .hash = inet_hash, |
ab1e0a13 ACM |
1844 | .unhash = inet_unhash, |
1845 | .get_port = inet_csk_get_port, | |
1da177e4 | 1846 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1847 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1848 | .sockets_allocated = &tcp_sockets_allocated, |
1849 | .memory_allocated = &tcp_memory_allocated, | |
1850 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1851 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1852 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1853 | .sysctl_wmem = sysctl_tcp_wmem, |
1854 | .sysctl_rmem = sysctl_tcp_rmem, | |
1855 | .max_header = MAX_TCP_HEADER, | |
1856 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1857 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1858 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1859 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1860 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1861 | .no_autobind = true, |
543d9cfe ACM |
1862 | #ifdef CONFIG_COMPAT |
1863 | .compat_setsockopt = compat_tcp_setsockopt, | |
1864 | .compat_getsockopt = compat_tcp_getsockopt, | |
1865 | #endif | |
c255a458 | 1866 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1867 | .proto_cgroup = tcp_proto_cgroup, |
1868 | #endif | |
f77d6021 | 1869 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1870 | }; |
1871 | ||
41135cc8 | 1872 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1873 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1874 | .handler = tcp_v6_rcv, |
1875 | .err_handler = tcp_v6_err, | |
1876 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1877 | }; | |
1878 | ||
1da177e4 LT |
1879 | static struct inet_protosw tcpv6_protosw = { |
1880 | .type = SOCK_STREAM, | |
1881 | .protocol = IPPROTO_TCP, | |
1882 | .prot = &tcpv6_prot, | |
1883 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1884 | .flags = INET_PROTOSW_PERMANENT | |
1885 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1886 | }; |
1887 | ||
2c8c1e72 | 1888 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1889 | { |
5677242f DL |
1890 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1891 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1892 | } |
1893 | ||
2c8c1e72 | 1894 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1895 | { |
5677242f | 1896 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1897 | } |
1898 | ||
2c8c1e72 | 1899 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1900 | { |
1901 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1902 | } |
1903 | ||
1904 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1905 | .init = tcpv6_net_init, |
1906 | .exit = tcpv6_net_exit, | |
1907 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1908 | }; |
1909 | ||
7f4e4868 | 1910 | int __init tcpv6_init(void) |
1da177e4 | 1911 | { |
7f4e4868 DL |
1912 | int ret; |
1913 | ||
3336288a VY |
1914 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1915 | if (ret) | |
c6b641a4 | 1916 | goto out; |
3336288a | 1917 | |
1da177e4 | 1918 | /* register inet6 protocol */ |
7f4e4868 DL |
1919 | ret = inet6_register_protosw(&tcpv6_protosw); |
1920 | if (ret) | |
1921 | goto out_tcpv6_protocol; | |
1922 | ||
93ec926b | 1923 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1924 | if (ret) |
1925 | goto out_tcpv6_protosw; | |
1926 | out: | |
1927 | return ret; | |
ae0f7d5f | 1928 | |
7f4e4868 DL |
1929 | out_tcpv6_protosw: |
1930 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1931 | out_tcpv6_protocol: |
1932 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1933 | goto out; |
1934 | } | |
1935 | ||
09f7709f | 1936 | void tcpv6_exit(void) |
7f4e4868 | 1937 | { |
93ec926b | 1938 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1939 | inet6_unregister_protosw(&tcpv6_protosw); |
1940 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1941 | } |