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; | |
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; |
4c9483b2 | 123 | struct flowi6 fl6; |
1da177e4 LT |
124 | struct dst_entry *dst; |
125 | int addr_type; | |
126 | int err; | |
127 | ||
1ab1457c | 128 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
129 | return -EINVAL; |
130 | ||
1ab1457c | 131 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 132 | return -EAFNOSUPPORT; |
1da177e4 | 133 | |
4c9483b2 | 134 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
135 | |
136 | if (np->sndflow) { | |
4c9483b2 DM |
137 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
138 | IP6_ECN_flow_init(fl6.flowlabel); | |
139 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 140 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 141 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
63159f29 | 142 | if (!flowlabel) |
1da177e4 | 143 | return -EINVAL; |
1da177e4 LT |
144 | fl6_sock_release(flowlabel); |
145 | } | |
146 | } | |
147 | ||
148 | /* | |
1ab1457c YH |
149 | * connect() to INADDR_ANY means loopback (BSD'ism). |
150 | */ | |
151 | ||
4c99aa40 | 152 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 153 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
154 | |
155 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
156 | ||
4c99aa40 | 157 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
158 | return -ENETUNREACH; |
159 | ||
160 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
161 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
162 | usin->sin6_scope_id) { | |
163 | /* If interface is set while binding, indices | |
164 | * must coincide. | |
165 | */ | |
166 | if (sk->sk_bound_dev_if && | |
167 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
168 | return -EINVAL; | |
169 | ||
170 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
171 | } | |
172 | ||
173 | /* Connect to link-local address requires an interface */ | |
174 | if (!sk->sk_bound_dev_if) | |
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 179 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
180 | tp->rx_opt.ts_recent = 0; |
181 | tp->rx_opt.ts_recent_stamp = 0; | |
182 | tp->write_seq = 0; | |
183 | } | |
184 | ||
efe4208f | 185 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 186 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
187 | |
188 | /* | |
189 | * TCP over IPv4 | |
190 | */ | |
191 | ||
192 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 193 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
194 | struct sockaddr_in sin; |
195 | ||
196 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
197 | ||
198 | if (__ipv6_only_sock(sk)) | |
199 | return -ENETUNREACH; | |
200 | ||
201 | sin.sin_family = AF_INET; | |
202 | sin.sin_port = usin->sin6_port; | |
203 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
204 | ||
d83d8461 | 205 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 206 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
207 | #ifdef CONFIG_TCP_MD5SIG |
208 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
209 | #endif | |
1da177e4 LT |
210 | |
211 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
212 | ||
213 | if (err) { | |
d83d8461 ACM |
214 | icsk->icsk_ext_hdr_len = exthdrlen; |
215 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 216 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
217 | #ifdef CONFIG_TCP_MD5SIG |
218 | tp->af_specific = &tcp_sock_ipv6_specific; | |
219 | #endif | |
1da177e4 | 220 | goto failure; |
1da177e4 | 221 | } |
d1e559d0 | 222 | np->saddr = sk->sk_v6_rcv_saddr; |
1da177e4 LT |
223 | |
224 | return err; | |
225 | } | |
226 | ||
efe4208f ED |
227 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
228 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 229 | |
4c9483b2 | 230 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 231 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 232 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
233 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
234 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
235 | fl6.fl6_dport = usin->sin6_port; |
236 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 237 | |
4c9483b2 | 238 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 239 | |
4c9483b2 | 240 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 241 | |
0e0d44ab | 242 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
243 | if (IS_ERR(dst)) { |
244 | err = PTR_ERR(dst); | |
1da177e4 | 245 | goto failure; |
14e50e57 | 246 | } |
1da177e4 | 247 | |
63159f29 | 248 | if (!saddr) { |
4c9483b2 | 249 | saddr = &fl6.saddr; |
efe4208f | 250 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
251 | } |
252 | ||
253 | /* set the source address */ | |
4e3fd7a0 | 254 | np->saddr = *saddr; |
c720c7e8 | 255 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 256 | |
f83ef8c0 | 257 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 258 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 259 | |
493f377d DM |
260 | if (tcp_death_row.sysctl_tw_recycle && |
261 | !tp->rx_opt.ts_recent_stamp && | |
fd0273d7 | 262 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr)) |
81166dd6 | 263 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 264 | |
d83d8461 | 265 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 266 | if (np->opt) |
d83d8461 ACM |
267 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
268 | np->opt->opt_nflen); | |
1da177e4 LT |
269 | |
270 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
271 | ||
c720c7e8 | 272 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
273 | |
274 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 275 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
276 | if (err) |
277 | goto late_failure; | |
278 | ||
877d1f62 | 279 | sk_set_txhash(sk); |
9e7ceb06 | 280 | |
2b916477 | 281 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 282 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 283 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
284 | inet->inet_sport, |
285 | inet->inet_dport); | |
1da177e4 LT |
286 | |
287 | err = tcp_connect(sk); | |
288 | if (err) | |
289 | goto late_failure; | |
290 | ||
291 | return 0; | |
292 | ||
293 | late_failure: | |
294 | tcp_set_state(sk, TCP_CLOSE); | |
295 | __sk_dst_reset(sk); | |
296 | failure: | |
c720c7e8 | 297 | inet->inet_dport = 0; |
1da177e4 LT |
298 | sk->sk_route_caps = 0; |
299 | return err; | |
300 | } | |
301 | ||
563d34d0 ED |
302 | static void tcp_v6_mtu_reduced(struct sock *sk) |
303 | { | |
304 | struct dst_entry *dst; | |
305 | ||
306 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
307 | return; | |
308 | ||
309 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
310 | if (!dst) | |
311 | return; | |
312 | ||
313 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
314 | tcp_sync_mss(sk, dst_mtu(dst)); | |
315 | tcp_simple_retransmit(sk); | |
316 | } | |
317 | } | |
318 | ||
1da177e4 | 319 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 320 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 321 | { |
4c99aa40 | 322 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 323 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
2215089b ED |
324 | struct net *net = dev_net(skb->dev); |
325 | struct request_sock *fastopen; | |
1da177e4 | 326 | struct ipv6_pinfo *np; |
1ab1457c | 327 | struct tcp_sock *tp; |
0a672f74 | 328 | __u32 seq, snd_una; |
2215089b ED |
329 | struct sock *sk; |
330 | int err; | |
1da177e4 | 331 | |
2215089b ED |
332 | sk = __inet6_lookup_established(net, &tcp_hashinfo, |
333 | &hdr->daddr, th->dest, | |
334 | &hdr->saddr, ntohs(th->source), | |
335 | skb->dev->ifindex); | |
1da177e4 | 336 | |
2215089b | 337 | if (!sk) { |
e41b5368 DL |
338 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
339 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
340 | return; |
341 | } | |
342 | ||
343 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 344 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
345 | return; |
346 | } | |
2215089b ED |
347 | seq = ntohl(th->seq); |
348 | if (sk->sk_state == TCP_NEW_SYN_RECV) | |
349 | return tcp_req_err(sk, seq); | |
1da177e4 LT |
350 | |
351 | bh_lock_sock(sk); | |
563d34d0 | 352 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 353 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
354 | |
355 | if (sk->sk_state == TCP_CLOSE) | |
356 | goto out; | |
357 | ||
e802af9c SH |
358 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
359 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
360 | goto out; | |
361 | } | |
362 | ||
1da177e4 | 363 | tp = tcp_sk(sk); |
0a672f74 YC |
364 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
365 | fastopen = tp->fastopen_rsk; | |
366 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 367 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 368 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 369 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
370 | goto out; |
371 | } | |
372 | ||
373 | np = inet6_sk(sk); | |
374 | ||
ec18d9a2 DM |
375 | if (type == NDISC_REDIRECT) { |
376 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
377 | ||
1ed5c48f | 378 | if (dst) |
6700c270 | 379 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 380 | goto out; |
ec18d9a2 DM |
381 | } |
382 | ||
1da177e4 | 383 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
384 | /* We are not interested in TCP_LISTEN and open_requests |
385 | * (SYN-ACKs send out by Linux are always <576bytes so | |
386 | * they should go through unfragmented). | |
387 | */ | |
388 | if (sk->sk_state == TCP_LISTEN) | |
389 | goto out; | |
390 | ||
93b36cf3 HFS |
391 | if (!ip6_sk_accept_pmtu(sk)) |
392 | goto out; | |
393 | ||
563d34d0 ED |
394 | tp->mtu_info = ntohl(info); |
395 | if (!sock_owned_by_user(sk)) | |
396 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
397 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
398 | &tp->tsq_flags)) | |
399 | sock_hold(sk); | |
1da177e4 LT |
400 | goto out; |
401 | } | |
402 | ||
403 | icmpv6_err_convert(type, code, &err); | |
404 | ||
60236fdd | 405 | /* Might be for an request_sock */ |
1da177e4 | 406 | switch (sk->sk_state) { |
1da177e4 | 407 | case TCP_SYN_SENT: |
0a672f74 YC |
408 | case TCP_SYN_RECV: |
409 | /* Only in fast or simultaneous open. If a fast open socket is | |
410 | * is already accepted it is treated as a connected one below. | |
411 | */ | |
63159f29 | 412 | if (fastopen && !fastopen->sk) |
0a672f74 YC |
413 | break; |
414 | ||
1da177e4 | 415 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
416 | sk->sk_err = err; |
417 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
418 | ||
419 | tcp_done(sk); | |
420 | } else | |
421 | sk->sk_err_soft = err; | |
422 | goto out; | |
423 | } | |
424 | ||
425 | if (!sock_owned_by_user(sk) && np->recverr) { | |
426 | sk->sk_err = err; | |
427 | sk->sk_error_report(sk); | |
428 | } else | |
429 | sk->sk_err_soft = err; | |
430 | ||
431 | out: | |
432 | bh_unlock_sock(sk); | |
433 | sock_put(sk); | |
434 | } | |
435 | ||
436 | ||
9f10d3f6 | 437 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 438 | struct flowi *fl, |
3840a06e | 439 | struct request_sock *req, |
3a19ce0e DL |
440 | u16 queue_mapping, |
441 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 442 | { |
634fb979 | 443 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 444 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 445 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 446 | struct sk_buff *skb; |
9494218f | 447 | int err = -ENOMEM; |
1da177e4 | 448 | |
9f10d3f6 NC |
449 | /* First, grab a route. */ |
450 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 451 | goto done; |
9494218f | 452 | |
3a19ce0e | 453 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 454 | |
1da177e4 | 455 | if (skb) { |
634fb979 ED |
456 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
457 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 458 | |
634fb979 | 459 | fl6->daddr = ireq->ir_v6_rmt_addr; |
53b24b8f | 460 | if (np->repflow && ireq->pktopts) |
df3687ff FF |
461 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); |
462 | ||
fff32699 | 463 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 464 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 465 | err = net_xmit_eval(err); |
1da177e4 LT |
466 | } |
467 | ||
468 | done: | |
1da177e4 LT |
469 | return err; |
470 | } | |
471 | ||
72659ecc | 472 | |
60236fdd | 473 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 474 | { |
634fb979 | 475 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
476 | } |
477 | ||
cfb6eeb4 YH |
478 | #ifdef CONFIG_TCP_MD5SIG |
479 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 480 | const struct in6_addr *addr) |
cfb6eeb4 | 481 | { |
a915da9b | 482 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
483 | } |
484 | ||
485 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
fd3a154a | 486 | const struct sock *addr_sk) |
cfb6eeb4 | 487 | { |
efe4208f | 488 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
489 | } |
490 | ||
4aa956d8 WY |
491 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
492 | int optlen) | |
cfb6eeb4 YH |
493 | { |
494 | struct tcp_md5sig cmd; | |
495 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
496 | |
497 | if (optlen < sizeof(cmd)) | |
498 | return -EINVAL; | |
499 | ||
500 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
501 | return -EFAULT; | |
502 | ||
503 | if (sin6->sin6_family != AF_INET6) | |
504 | return -EINVAL; | |
505 | ||
506 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 507 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
508 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
509 | AF_INET); | |
510 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
511 | AF_INET6); | |
cfb6eeb4 YH |
512 | } |
513 | ||
514 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
515 | return -EINVAL; | |
516 | ||
a915da9b ED |
517 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
518 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
519 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 520 | |
a915da9b ED |
521 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
522 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
523 | } |
524 | ||
49a72dfb | 525 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
526 | const struct in6_addr *daddr, |
527 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 528 | { |
cfb6eeb4 | 529 | struct tcp6_pseudohdr *bp; |
49a72dfb | 530 | struct scatterlist sg; |
8d26d76d | 531 | |
cfb6eeb4 | 532 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 533 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
534 | bp->saddr = *saddr; |
535 | bp->daddr = *daddr; | |
49a72dfb | 536 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 537 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 538 | |
49a72dfb AL |
539 | sg_init_one(&sg, bp, sizeof(*bp)); |
540 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
541 | } | |
c7da57a1 | 542 | |
49a72dfb | 543 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 544 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 545 | const struct tcphdr *th) |
49a72dfb AL |
546 | { |
547 | struct tcp_md5sig_pool *hp; | |
548 | struct hash_desc *desc; | |
549 | ||
550 | hp = tcp_get_md5sig_pool(); | |
551 | if (!hp) | |
552 | goto clear_hash_noput; | |
553 | desc = &hp->md5_desc; | |
554 | ||
555 | if (crypto_hash_init(desc)) | |
556 | goto clear_hash; | |
557 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
558 | goto clear_hash; | |
559 | if (tcp_md5_hash_header(hp, th)) | |
560 | goto clear_hash; | |
561 | if (tcp_md5_hash_key(hp, key)) | |
562 | goto clear_hash; | |
563 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 564 | goto clear_hash; |
cfb6eeb4 | 565 | |
cfb6eeb4 | 566 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 567 | return 0; |
49a72dfb | 568 | |
cfb6eeb4 YH |
569 | clear_hash: |
570 | tcp_put_md5sig_pool(); | |
571 | clear_hash_noput: | |
572 | memset(md5_hash, 0, 16); | |
49a72dfb | 573 | return 1; |
cfb6eeb4 YH |
574 | } |
575 | ||
39f8e58e ED |
576 | static int tcp_v6_md5_hash_skb(char *md5_hash, |
577 | const struct tcp_md5sig_key *key, | |
318cf7aa | 578 | const struct sock *sk, |
318cf7aa | 579 | const struct sk_buff *skb) |
cfb6eeb4 | 580 | { |
b71d1d42 | 581 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
582 | struct tcp_md5sig_pool *hp; |
583 | struct hash_desc *desc; | |
318cf7aa | 584 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 585 | |
39f8e58e ED |
586 | if (sk) { /* valid for establish/request sockets */ |
587 | saddr = &sk->sk_v6_rcv_saddr; | |
efe4208f | 588 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 589 | } else { |
b71d1d42 | 590 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
591 | saddr = &ip6h->saddr; |
592 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 593 | } |
49a72dfb AL |
594 | |
595 | hp = tcp_get_md5sig_pool(); | |
596 | if (!hp) | |
597 | goto clear_hash_noput; | |
598 | desc = &hp->md5_desc; | |
599 | ||
600 | if (crypto_hash_init(desc)) | |
601 | goto clear_hash; | |
602 | ||
603 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
604 | goto clear_hash; | |
605 | if (tcp_md5_hash_header(hp, th)) | |
606 | goto clear_hash; | |
607 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
608 | goto clear_hash; | |
609 | if (tcp_md5_hash_key(hp, key)) | |
610 | goto clear_hash; | |
611 | if (crypto_hash_final(desc, md5_hash)) | |
612 | goto clear_hash; | |
613 | ||
614 | tcp_put_md5sig_pool(); | |
615 | return 0; | |
616 | ||
617 | clear_hash: | |
618 | tcp_put_md5sig_pool(); | |
619 | clear_hash_noput: | |
620 | memset(md5_hash, 0, 16); | |
621 | return 1; | |
cfb6eeb4 YH |
622 | } |
623 | ||
ff74e23f | 624 | static bool tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 625 | { |
cf533ea5 | 626 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 627 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 628 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 629 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 630 | int genhash; |
cfb6eeb4 YH |
631 | u8 newhash[16]; |
632 | ||
633 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 634 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 635 | |
785957d3 DM |
636 | /* We've parsed the options - do we have a hash? */ |
637 | if (!hash_expected && !hash_location) | |
ff74e23f | 638 | return false; |
785957d3 DM |
639 | |
640 | if (hash_expected && !hash_location) { | |
641 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
ff74e23f | 642 | return true; |
cfb6eeb4 YH |
643 | } |
644 | ||
785957d3 DM |
645 | if (!hash_expected && hash_location) { |
646 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
ff74e23f | 647 | return true; |
cfb6eeb4 YH |
648 | } |
649 | ||
650 | /* check the signature */ | |
49a72dfb AL |
651 | genhash = tcp_v6_md5_hash_skb(newhash, |
652 | hash_expected, | |
39f8e58e | 653 | NULL, skb); |
49a72dfb | 654 | |
cfb6eeb4 | 655 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
656 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
657 | genhash ? "failed" : "mismatch", | |
658 | &ip6h->saddr, ntohs(th->source), | |
659 | &ip6h->daddr, ntohs(th->dest)); | |
ff74e23f | 660 | return true; |
cfb6eeb4 | 661 | } |
ff74e23f | 662 | return false; |
cfb6eeb4 YH |
663 | } |
664 | #endif | |
665 | ||
16bea70a OP |
666 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
667 | struct sk_buff *skb) | |
668 | { | |
669 | struct inet_request_sock *ireq = inet_rsk(req); | |
670 | struct ipv6_pinfo *np = inet6_sk(sk); | |
671 | ||
672 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
673 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
674 | ||
16bea70a OP |
675 | /* So that link locals have meaning */ |
676 | if (!sk->sk_bound_dev_if && | |
677 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
870c3151 | 678 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 679 | |
04317daf | 680 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
a224772d ED |
681 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
682 | np->rxopt.bits.rxinfo || | |
16bea70a OP |
683 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
684 | np->rxopt.bits.rxohlim || np->repflow)) { | |
685 | atomic_inc(&skb->users); | |
686 | ireq->pktopts = skb; | |
687 | } | |
688 | } | |
689 | ||
d94e0417 OP |
690 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
691 | const struct request_sock *req, | |
692 | bool *strict) | |
693 | { | |
694 | if (strict) | |
695 | *strict = true; | |
696 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
697 | } | |
698 | ||
c6aefafb | 699 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 700 | .family = AF_INET6, |
2e6599cb | 701 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 702 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
703 | .send_ack = tcp_v6_reqsk_send_ack, |
704 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 705 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 706 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
707 | }; |
708 | ||
b2e4b3de | 709 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
710 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
711 | sizeof(struct ipv6hdr), | |
16bea70a | 712 | #ifdef CONFIG_TCP_MD5SIG |
fd3a154a | 713 | .req_md5_lookup = tcp_v6_md5_lookup, |
e3afe7b7 | 714 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 715 | #endif |
16bea70a | 716 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
717 | #ifdef CONFIG_SYN_COOKIES |
718 | .cookie_init_seq = cookie_v6_init_sequence, | |
719 | #endif | |
d94e0417 | 720 | .route_req = tcp_v6_route_req, |
936b8bdb | 721 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 722 | .send_synack = tcp_v6_send_synack, |
695da14e | 723 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 724 | }; |
cfb6eeb4 | 725 | |
0f85feae ED |
726 | static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq, |
727 | u32 ack, u32 win, u32 tsval, u32 tsecr, | |
728 | int oif, struct tcp_md5sig_key *key, int rst, | |
729 | u8 tclass, u32 label) | |
1da177e4 | 730 | { |
cf533ea5 ED |
731 | const struct tcphdr *th = tcp_hdr(skb); |
732 | struct tcphdr *t1; | |
1da177e4 | 733 | struct sk_buff *buff; |
4c9483b2 | 734 | struct flowi6 fl6; |
0f85feae | 735 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 736 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 737 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 738 | struct dst_entry *dst; |
81ada62d | 739 | __be32 *topt; |
1da177e4 | 740 | |
ee684b6f | 741 | if (tsecr) |
626e264d | 742 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 743 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
744 | if (key) |
745 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
746 | #endif | |
747 | ||
cfb6eeb4 | 748 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 749 | GFP_ATOMIC); |
63159f29 | 750 | if (!buff) |
1ab1457c | 751 | return; |
1da177e4 | 752 | |
cfb6eeb4 | 753 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 754 | |
cfb6eeb4 | 755 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 756 | skb_reset_transport_header(buff); |
1da177e4 LT |
757 | |
758 | /* Swap the send and the receive. */ | |
759 | memset(t1, 0, sizeof(*t1)); | |
760 | t1->dest = th->source; | |
761 | t1->source = th->dest; | |
cfb6eeb4 | 762 | t1->doff = tot_len / 4; |
626e264d IJ |
763 | t1->seq = htonl(seq); |
764 | t1->ack_seq = htonl(ack); | |
765 | t1->ack = !rst || !th->ack; | |
766 | t1->rst = rst; | |
767 | t1->window = htons(win); | |
1da177e4 | 768 | |
81ada62d IJ |
769 | topt = (__be32 *)(t1 + 1); |
770 | ||
ee684b6f | 771 | if (tsecr) { |
626e264d IJ |
772 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
773 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
774 | *topt++ = htonl(tsval); |
775 | *topt++ = htonl(tsecr); | |
626e264d IJ |
776 | } |
777 | ||
cfb6eeb4 YH |
778 | #ifdef CONFIG_TCP_MD5SIG |
779 | if (key) { | |
81ada62d IJ |
780 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
781 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
782 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
783 | &ipv6_hdr(skb)->saddr, |
784 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
785 | } |
786 | #endif | |
787 | ||
4c9483b2 | 788 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
789 | fl6.daddr = ipv6_hdr(skb)->saddr; |
790 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 791 | fl6.flowlabel = label; |
1da177e4 | 792 | |
e5700aff DM |
793 | buff->ip_summed = CHECKSUM_PARTIAL; |
794 | buff->csum = 0; | |
795 | ||
4c9483b2 | 796 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 797 | |
4c9483b2 | 798 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 799 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 800 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
801 | else |
802 | fl6.flowi6_oif = oif; | |
e110861f | 803 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
804 | fl6.fl6_dport = t1->dest; |
805 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 806 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 807 | |
c20121ae DL |
808 | /* Pass a socket to ip6_dst_lookup either it is for RST |
809 | * Underlying function will use this to retrieve the network | |
810 | * namespace | |
811 | */ | |
0e0d44ab | 812 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
813 | if (!IS_ERR(dst)) { |
814 | skb_dst_set(buff, dst); | |
b903d324 | 815 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
816 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
817 | if (rst) | |
818 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
819 | return; | |
1da177e4 LT |
820 | } |
821 | ||
822 | kfree_skb(buff); | |
823 | } | |
824 | ||
626e264d | 825 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 826 | { |
cf533ea5 | 827 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 828 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 829 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
830 | #ifdef CONFIG_TCP_MD5SIG |
831 | const __u8 *hash_location = NULL; | |
832 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
833 | unsigned char newhash[16]; | |
834 | int genhash; | |
835 | struct sock *sk1 = NULL; | |
836 | #endif | |
9c76a114 | 837 | int oif; |
1da177e4 | 838 | |
626e264d | 839 | if (th->rst) |
1da177e4 LT |
840 | return; |
841 | ||
c3658e8d ED |
842 | /* If sk not NULL, it means we did a successful lookup and incoming |
843 | * route had to be correct. prequeue might have dropped our dst. | |
844 | */ | |
845 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 846 | return; |
1da177e4 | 847 | |
cfb6eeb4 | 848 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
849 | hash_location = tcp_parse_md5sig_option(th); |
850 | if (!sk && hash_location) { | |
851 | /* | |
852 | * active side is lost. Try to find listening socket through | |
853 | * source port, and then find md5 key through listening socket. | |
854 | * we are not loose security here: | |
855 | * Incoming packet is checked with md5 hash with finding key, | |
856 | * no RST generated if md5 hash doesn't match. | |
857 | */ | |
858 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
859 | &tcp_hashinfo, &ipv6h->saddr, |
860 | th->source, &ipv6h->daddr, | |
870c3151 | 861 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf SL |
862 | if (!sk1) |
863 | return; | |
864 | ||
865 | rcu_read_lock(); | |
866 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
867 | if (!key) | |
868 | goto release_sk1; | |
869 | ||
39f8e58e | 870 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb); |
658ddaaf SL |
871 | if (genhash || memcmp(hash_location, newhash, 16) != 0) |
872 | goto release_sk1; | |
873 | } else { | |
874 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
875 | } | |
cfb6eeb4 YH |
876 | #endif |
877 | ||
626e264d IJ |
878 | if (th->ack) |
879 | seq = ntohl(th->ack_seq); | |
880 | else | |
881 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
882 | (th->doff << 2); | |
1da177e4 | 883 | |
9c76a114 | 884 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 885 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
886 | |
887 | #ifdef CONFIG_TCP_MD5SIG | |
888 | release_sk1: | |
889 | if (sk1) { | |
890 | rcu_read_unlock(); | |
891 | sock_put(sk1); | |
892 | } | |
893 | #endif | |
626e264d | 894 | } |
1da177e4 | 895 | |
0f85feae ED |
896 | static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq, |
897 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, | |
1d13a96c FF |
898 | struct tcp_md5sig_key *key, u8 tclass, |
899 | u32 label) | |
626e264d | 900 | { |
0f85feae ED |
901 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
902 | tclass, label); | |
1da177e4 LT |
903 | } |
904 | ||
905 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
906 | { | |
8feaf0c0 | 907 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 908 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 909 | |
0f85feae | 910 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 911 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 912 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 913 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
21858cd0 | 914 | tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel)); |
1da177e4 | 915 | |
8feaf0c0 | 916 | inet_twsk_put(tw); |
1da177e4 LT |
917 | } |
918 | ||
6edafaaf GJ |
919 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
920 | struct request_sock *req) | |
1da177e4 | 921 | { |
3a19ce0e DL |
922 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
923 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
924 | */ | |
0f85feae | 925 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 926 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
0f85feae ED |
927 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
928 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, | |
1d13a96c FF |
929 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
930 | 0, 0); | |
1da177e4 LT |
931 | } |
932 | ||
933 | ||
4c99aa40 | 934 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 935 | { |
aa8223c7 | 936 | const struct tcphdr *th = tcp_hdr(skb); |
52452c54 | 937 | struct request_sock *req; |
1da177e4 LT |
938 | struct sock *nsk; |
939 | ||
940 | /* Find possible connection requests. */ | |
52452c54 | 941 | req = inet6_csk_search_req(sk, th->source, |
0660e03f | 942 | &ipv6_hdr(skb)->saddr, |
870c3151 | 943 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
fa76ce73 ED |
944 | if (req) { |
945 | nsk = tcp_check_req(sk, skb, req, false); | |
3257d8b1 | 946 | if (!nsk || nsk == sk) |
b357a364 | 947 | reqsk_put(req); |
fa76ce73 ED |
948 | return nsk; |
949 | } | |
3b1e0a65 | 950 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
870c3151 ED |
951 | &ipv6_hdr(skb)->saddr, th->source, |
952 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
953 | tcp_v6_iif(skb)); | |
1da177e4 LT |
954 | |
955 | if (nsk) { | |
956 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
957 | bh_lock_sock(nsk); | |
958 | return nsk; | |
959 | } | |
9469c7b4 | 960 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
961 | return NULL; |
962 | } | |
963 | ||
c6aefafb | 964 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 965 | if (!th->syn) |
c6aefafb | 966 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
967 | #endif |
968 | return sk; | |
969 | } | |
970 | ||
1da177e4 LT |
971 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
972 | { | |
1da177e4 LT |
973 | if (skb->protocol == htons(ETH_P_IP)) |
974 | return tcp_v4_conn_request(sk, skb); | |
975 | ||
976 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 977 | goto drop; |
1da177e4 | 978 | |
1fb6f159 OP |
979 | return tcp_conn_request(&tcp6_request_sock_ops, |
980 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
981 | |
982 | drop: | |
5f1e942c | 983 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
984 | return 0; /* don't send reset */ |
985 | } | |
986 | ||
4c99aa40 WC |
987 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
988 | struct request_sock *req, | |
989 | struct dst_entry *dst) | |
1da177e4 | 990 | { |
634fb979 | 991 | struct inet_request_sock *ireq; |
1da177e4 LT |
992 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
993 | struct tcp6_sock *newtcp6sk; | |
994 | struct inet_sock *newinet; | |
995 | struct tcp_sock *newtp; | |
996 | struct sock *newsk; | |
cfb6eeb4 YH |
997 | #ifdef CONFIG_TCP_MD5SIG |
998 | struct tcp_md5sig_key *key; | |
999 | #endif | |
3840a06e | 1000 | struct flowi6 fl6; |
1da177e4 LT |
1001 | |
1002 | if (skb->protocol == htons(ETH_P_IP)) { | |
1003 | /* | |
1004 | * v6 mapped | |
1005 | */ | |
1006 | ||
1007 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1008 | ||
63159f29 | 1009 | if (!newsk) |
1da177e4 LT |
1010 | return NULL; |
1011 | ||
1012 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1013 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1014 | ||
1015 | newinet = inet_sk(newsk); | |
1016 | newnp = inet6_sk(newsk); | |
1017 | newtp = tcp_sk(newsk); | |
1018 | ||
1019 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1020 | ||
d1e559d0 | 1021 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
1da177e4 | 1022 | |
8292a17a | 1023 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1024 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1025 | #ifdef CONFIG_TCP_MD5SIG |
1026 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1027 | #endif | |
1028 | ||
676a1184 YZ |
1029 | newnp->ipv6_ac_list = NULL; |
1030 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1031 | newnp->pktoptions = NULL; |
1032 | newnp->opt = NULL; | |
870c3151 | 1033 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1034 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1035 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1036 | if (np->repflow) |
1037 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1038 | |
e6848976 ACM |
1039 | /* |
1040 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1041 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1042 | * that function for the gory details. -acme | |
1da177e4 | 1043 | */ |
1da177e4 LT |
1044 | |
1045 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1046 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1047 | Sync it now. |
1048 | */ | |
d83d8461 | 1049 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1050 | |
1051 | return newsk; | |
1052 | } | |
1053 | ||
634fb979 | 1054 | ireq = inet_rsk(req); |
1da177e4 LT |
1055 | |
1056 | if (sk_acceptq_is_full(sk)) | |
1057 | goto out_overflow; | |
1058 | ||
493f377d | 1059 | if (!dst) { |
3840a06e | 1060 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1061 | if (!dst) |
1da177e4 | 1062 | goto out; |
1ab1457c | 1063 | } |
1da177e4 LT |
1064 | |
1065 | newsk = tcp_create_openreq_child(sk, req, skb); | |
63159f29 | 1066 | if (!newsk) |
093d2823 | 1067 | goto out_nonewsk; |
1da177e4 | 1068 | |
e6848976 ACM |
1069 | /* |
1070 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1071 | * count here, tcp_create_openreq_child now does this for us, see the | |
1072 | * comment in that function for the gory details. -acme | |
1073 | */ | |
1da177e4 | 1074 | |
59eed279 | 1075 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1076 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1077 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1078 | |
1079 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1080 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1081 | ||
1082 | newtp = tcp_sk(newsk); | |
1083 | newinet = inet_sk(newsk); | |
1084 | newnp = inet6_sk(newsk); | |
1085 | ||
1086 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1087 | ||
634fb979 ED |
1088 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1089 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1090 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1091 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1092 | |
877d1f62 | 1093 | sk_set_txhash(newsk); |
b73c3d0e | 1094 | |
1ab1457c | 1095 | /* Now IPv6 options... |
1da177e4 LT |
1096 | |
1097 | First: no IPv4 options. | |
1098 | */ | |
f6d8bd05 | 1099 | newinet->inet_opt = NULL; |
676a1184 | 1100 | newnp->ipv6_ac_list = NULL; |
d35690be | 1101 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1102 | |
1103 | /* Clone RX bits */ | |
1104 | newnp->rxopt.all = np->rxopt.all; | |
1105 | ||
1106 | /* Clone pktoptions received with SYN */ | |
1107 | newnp->pktoptions = NULL; | |
53b24b8f | 1108 | if (ireq->pktopts) { |
634fb979 | 1109 | newnp->pktoptions = skb_clone(ireq->pktopts, |
99a1dec7 | 1110 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1111 | consume_skb(ireq->pktopts); |
1112 | ireq->pktopts = NULL; | |
1da177e4 LT |
1113 | if (newnp->pktoptions) |
1114 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1115 | } | |
1116 | newnp->opt = NULL; | |
870c3151 | 1117 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1118 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1119 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1120 | if (np->repflow) |
1121 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1122 | |
1123 | /* Clone native IPv6 options from listening socket (if any) | |
1124 | ||
1125 | Yes, keeping reference count would be much more clever, | |
1126 | but we make one more one thing there: reattach optmem | |
1127 | to newsk. | |
1128 | */ | |
43264e0b RL |
1129 | if (np->opt) |
1130 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1131 | |
d83d8461 | 1132 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1133 | if (newnp->opt) |
d83d8461 ACM |
1134 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1135 | newnp->opt->opt_flen); | |
1da177e4 | 1136 | |
81164413 DB |
1137 | tcp_ca_openreq_child(newsk, dst); |
1138 | ||
1da177e4 | 1139 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1140 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1141 | if (tcp_sk(sk)->rx_opt.user_mss && |
1142 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1143 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1144 | ||
1da177e4 LT |
1145 | tcp_initialize_rcv_mss(newsk); |
1146 | ||
c720c7e8 ED |
1147 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1148 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1149 | |
cfb6eeb4 YH |
1150 | #ifdef CONFIG_TCP_MD5SIG |
1151 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 | 1152 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
53b24b8f | 1153 | if (key) { |
cfb6eeb4 YH |
1154 | /* We're using one, so create a matching key |
1155 | * on the newsk structure. If we fail to get | |
1156 | * memory, then we end up not copying the key | |
1157 | * across. Shucks. | |
1158 | */ | |
efe4208f | 1159 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1160 | AF_INET6, key->key, key->keylen, |
1161 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1162 | } |
1163 | #endif | |
1164 | ||
093d2823 | 1165 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1166 | inet_csk_prepare_forced_close(newsk); |
1167 | tcp_done(newsk); | |
093d2823 BS |
1168 | goto out; |
1169 | } | |
77a6a471 | 1170 | __inet_hash(newsk, NULL); |
1da177e4 LT |
1171 | |
1172 | return newsk; | |
1173 | ||
1174 | out_overflow: | |
de0744af | 1175 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1176 | out_nonewsk: |
1da177e4 | 1177 | dst_release(dst); |
093d2823 BS |
1178 | out: |
1179 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1180 | return NULL; |
1181 | } | |
1182 | ||
1da177e4 LT |
1183 | /* The socket must have it's spinlock held when we get |
1184 | * here. | |
1185 | * | |
1186 | * We have a potential double-lock case here, so even when | |
1187 | * doing backlog processing we use the BH locking scheme. | |
1188 | * This is because we cannot sleep with the original spinlock | |
1189 | * held. | |
1190 | */ | |
1191 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1192 | { | |
1193 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1194 | struct tcp_sock *tp; | |
1195 | struct sk_buff *opt_skb = NULL; | |
1196 | ||
1197 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1198 | goes to IPv4 receive handler and backlogged. | |
1199 | From backlog it always goes here. Kerboom... | |
1200 | Fortunately, tcp_rcv_established and rcv_established | |
1201 | handle them correctly, but it is not case with | |
1202 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1203 | */ | |
1204 | ||
1205 | if (skb->protocol == htons(ETH_P_IP)) | |
1206 | return tcp_v4_do_rcv(sk, skb); | |
1207 | ||
fda9ef5d | 1208 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1209 | goto discard; |
1210 | ||
1211 | /* | |
1212 | * socket locking is here for SMP purposes as backlog rcv | |
1213 | * is currently called with bh processing disabled. | |
1214 | */ | |
1215 | ||
1216 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1217 | ||
1218 | Yes, guys, it is the only place in our code, where we | |
1219 | may make it not affecting IPv4. | |
1220 | The rest of code is protocol independent, | |
1221 | and I do not like idea to uglify IPv4. | |
1222 | ||
1223 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1224 | looks not very well thought. For now we latch | |
1225 | options, received in the last packet, enqueued | |
1226 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1227 | --ANK (980728) |
1da177e4 LT |
1228 | */ |
1229 | if (np->rxopt.all) | |
99a1dec7 | 1230 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1231 | |
1232 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1233 | struct dst_entry *dst = sk->sk_rx_dst; |
1234 | ||
bdeab991 | 1235 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1236 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1237 | if (dst) { |
1238 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1239 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1240 | dst_release(dst); | |
1241 | sk->sk_rx_dst = NULL; | |
1242 | } | |
1243 | } | |
1244 | ||
c995ae22 | 1245 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1246 | if (opt_skb) |
1247 | goto ipv6_pktoptions; | |
1248 | return 0; | |
1249 | } | |
1250 | ||
12e25e10 | 1251 | if (tcp_checksum_complete(skb)) |
1da177e4 LT |
1252 | goto csum_err; |
1253 | ||
1ab1457c | 1254 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1255 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1256 | if (!nsk) | |
1257 | goto discard; | |
1258 | ||
1259 | /* | |
1260 | * Queue it on the new socket if the new socket is active, | |
1261 | * otherwise we just shortcircuit this and continue with | |
1262 | * the new socket.. | |
1263 | */ | |
4c99aa40 | 1264 | if (nsk != sk) { |
bdeab991 | 1265 | sock_rps_save_rxhash(nsk, skb); |
3d97379a | 1266 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1267 | if (tcp_child_process(sk, nsk, skb)) |
1268 | goto reset; | |
1269 | if (opt_skb) | |
1270 | __kfree_skb(opt_skb); | |
1271 | return 0; | |
1272 | } | |
47482f13 | 1273 | } else |
bdeab991 | 1274 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1275 | |
aa8223c7 | 1276 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1277 | goto reset; |
1da177e4 LT |
1278 | if (opt_skb) |
1279 | goto ipv6_pktoptions; | |
1280 | return 0; | |
1281 | ||
1282 | reset: | |
cfb6eeb4 | 1283 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1284 | discard: |
1285 | if (opt_skb) | |
1286 | __kfree_skb(opt_skb); | |
1287 | kfree_skb(skb); | |
1288 | return 0; | |
1289 | csum_err: | |
6a5dc9e5 | 1290 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1291 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1292 | goto discard; |
1293 | ||
1294 | ||
1295 | ipv6_pktoptions: | |
1296 | /* Do you ask, what is it? | |
1297 | ||
1298 | 1. skb was enqueued by tcp. | |
1299 | 2. skb is added to tail of read queue, rather than out of order. | |
1300 | 3. socket is not in passive state. | |
1301 | 4. Finally, it really contains options, which user wants to receive. | |
1302 | */ | |
1303 | tp = tcp_sk(sk); | |
1304 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1305 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1306 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1307 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1308 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1309 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1310 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1311 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1312 | if (np->repflow) |
1313 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1314 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1315 | skb_set_owner_r(opt_skb, sk); |
1316 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1317 | } else { | |
1318 | __kfree_skb(opt_skb); | |
1319 | opt_skb = xchg(&np->pktoptions, NULL); | |
1320 | } | |
1321 | } | |
1322 | ||
800d55f1 | 1323 | kfree_skb(opt_skb); |
1da177e4 LT |
1324 | return 0; |
1325 | } | |
1326 | ||
2dc49d16 ND |
1327 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1328 | const struct tcphdr *th) | |
1329 | { | |
1330 | /* This is tricky: we move IP6CB at its correct location into | |
1331 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1332 | * _decode_session6() uses IP6CB(). | |
1333 | * barrier() makes sure compiler won't play aliasing games. | |
1334 | */ | |
1335 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1336 | sizeof(struct inet6_skb_parm)); | |
1337 | barrier(); | |
1338 | ||
1339 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1340 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1341 | skb->len - th->doff*4); | |
1342 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1343 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1344 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1345 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1346 | TCP_SKB_CB(skb)->sacked = 0; | |
1347 | } | |
1348 | ||
4ad19de8 AK |
1349 | static void tcp_v6_restore_cb(struct sk_buff *skb) |
1350 | { | |
1351 | /* We need to move header back to the beginning if xfrm6_policy_check() | |
1352 | * and tcp_v6_fill_cb() are going to be called again. | |
1353 | */ | |
1354 | memmove(IP6CB(skb), &TCP_SKB_CB(skb)->header.h6, | |
1355 | sizeof(struct inet6_skb_parm)); | |
1356 | } | |
1357 | ||
e5bbef20 | 1358 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1359 | { |
cf533ea5 | 1360 | const struct tcphdr *th; |
b71d1d42 | 1361 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1362 | struct sock *sk; |
1363 | int ret; | |
a86b1e30 | 1364 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1365 | |
1366 | if (skb->pkt_type != PACKET_HOST) | |
1367 | goto discard_it; | |
1368 | ||
1369 | /* | |
1370 | * Count it even if it's bad. | |
1371 | */ | |
63231bdd | 1372 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1373 | |
1374 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1375 | goto discard_it; | |
1376 | ||
aa8223c7 | 1377 | th = tcp_hdr(skb); |
1da177e4 LT |
1378 | |
1379 | if (th->doff < sizeof(struct tcphdr)/4) | |
1380 | goto bad_packet; | |
1381 | if (!pskb_may_pull(skb, th->doff*4)) | |
1382 | goto discard_it; | |
1383 | ||
e4f45b7f | 1384 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1385 | goto csum_error; |
1da177e4 | 1386 | |
aa8223c7 | 1387 | th = tcp_hdr(skb); |
e802af9c | 1388 | hdr = ipv6_hdr(skb); |
1da177e4 | 1389 | |
870c3151 | 1390 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1391 | inet6_iif(skb)); |
1da177e4 LT |
1392 | if (!sk) |
1393 | goto no_tcp_socket; | |
1394 | ||
1395 | process: | |
1396 | if (sk->sk_state == TCP_TIME_WAIT) | |
1397 | goto do_time_wait; | |
1398 | ||
e802af9c SH |
1399 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1400 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1401 | goto discard_and_relse; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1405 | goto discard_and_relse; | |
1406 | ||
2dc49d16 ND |
1407 | tcp_v6_fill_cb(skb, hdr, th); |
1408 | ||
9ea88a15 DP |
1409 | #ifdef CONFIG_TCP_MD5SIG |
1410 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1411 | goto discard_and_relse; | |
1412 | #endif | |
1413 | ||
fda9ef5d | 1414 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1415 | goto discard_and_relse; |
1416 | ||
2c8c56e1 | 1417 | sk_incoming_cpu_update(sk); |
1da177e4 LT |
1418 | skb->dev = NULL; |
1419 | ||
293b9c42 | 1420 | bh_lock_sock_nested(sk); |
2efd055c | 1421 | tcp_sk(sk)->segs_in += max_t(u16, 1, skb_shinfo(skb)->gso_segs); |
1da177e4 LT |
1422 | ret = 0; |
1423 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1424 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1425 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1426 | } else if (unlikely(sk_add_backlog(sk, skb, |
1427 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1428 | bh_unlock_sock(sk); |
6cce09f8 | 1429 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1430 | goto discard_and_relse; |
1431 | } | |
1da177e4 LT |
1432 | bh_unlock_sock(sk); |
1433 | ||
1434 | sock_put(sk); | |
1435 | return ret ? -1 : 0; | |
1436 | ||
1437 | no_tcp_socket: | |
1438 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1439 | goto discard_it; | |
1440 | ||
2dc49d16 ND |
1441 | tcp_v6_fill_cb(skb, hdr, th); |
1442 | ||
12e25e10 | 1443 | if (tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1444 | csum_error: |
1445 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1446 | bad_packet: |
63231bdd | 1447 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1448 | } else { |
cfb6eeb4 | 1449 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1450 | } |
1451 | ||
1452 | discard_it: | |
1da177e4 LT |
1453 | kfree_skb(skb); |
1454 | return 0; | |
1455 | ||
1456 | discard_and_relse: | |
1457 | sock_put(sk); | |
1458 | goto discard_it; | |
1459 | ||
1460 | do_time_wait: | |
1461 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1462 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1463 | goto discard_it; |
1464 | } | |
1465 | ||
2dc49d16 ND |
1466 | tcp_v6_fill_cb(skb, hdr, th); |
1467 | ||
6a5dc9e5 ED |
1468 | if (tcp_checksum_complete(skb)) { |
1469 | inet_twsk_put(inet_twsk(sk)); | |
1470 | goto csum_error; | |
1da177e4 LT |
1471 | } |
1472 | ||
9469c7b4 | 1473 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1474 | case TCP_TW_SYN: |
1475 | { | |
1476 | struct sock *sk2; | |
1477 | ||
c346dca1 | 1478 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1479 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1480 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1481 | ntohs(th->dest), tcp_v6_iif(skb)); |
53b24b8f | 1482 | if (sk2) { |
295ff7ed | 1483 | struct inet_timewait_sock *tw = inet_twsk(sk); |
dbe7faa4 | 1484 | inet_twsk_deschedule_put(tw); |
1da177e4 | 1485 | sk = sk2; |
4ad19de8 | 1486 | tcp_v6_restore_cb(skb); |
1da177e4 LT |
1487 | goto process; |
1488 | } | |
1489 | /* Fall through to ACK */ | |
1490 | } | |
1491 | case TCP_TW_ACK: | |
1492 | tcp_v6_timewait_ack(sk, skb); | |
1493 | break; | |
1494 | case TCP_TW_RST: | |
4ad19de8 | 1495 | tcp_v6_restore_cb(skb); |
1da177e4 | 1496 | goto no_tcp_socket; |
4aa956d8 WY |
1497 | case TCP_TW_SUCCESS: |
1498 | ; | |
1da177e4 LT |
1499 | } |
1500 | goto discard_it; | |
1501 | } | |
1502 | ||
c7109986 ED |
1503 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1504 | { | |
1505 | const struct ipv6hdr *hdr; | |
1506 | const struct tcphdr *th; | |
1507 | struct sock *sk; | |
1508 | ||
1509 | if (skb->pkt_type != PACKET_HOST) | |
1510 | return; | |
1511 | ||
1512 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1513 | return; | |
1514 | ||
1515 | hdr = ipv6_hdr(skb); | |
1516 | th = tcp_hdr(skb); | |
1517 | ||
1518 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1519 | return; | |
1520 | ||
870c3151 | 1521 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1522 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1523 | &hdr->saddr, th->source, | |
1524 | &hdr->daddr, ntohs(th->dest), | |
1525 | inet6_iif(skb)); | |
1526 | if (sk) { | |
1527 | skb->sk = sk; | |
1528 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1529 | if (sk_fullsock(sk)) { |
d0c294c5 | 1530 | struct dst_entry *dst = READ_ONCE(sk->sk_rx_dst); |
f3f12135 | 1531 | |
c7109986 | 1532 | if (dst) |
5d299f3d | 1533 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1534 | if (dst && |
f3f12135 | 1535 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1536 | skb_dst_set_noref(skb, dst); |
1537 | } | |
1538 | } | |
1539 | } | |
1540 | ||
ccb7c410 DM |
1541 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1542 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1543 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1544 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1545 | }; |
1546 | ||
3b401a81 | 1547 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1548 | .queue_xmit = inet6_csk_xmit, |
1549 | .send_check = tcp_v6_send_check, | |
1550 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1551 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1552 | .conn_request = tcp_v6_conn_request, |
1553 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1554 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1555 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1556 | .setsockopt = ipv6_setsockopt, |
1557 | .getsockopt = ipv6_getsockopt, | |
1558 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1559 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1560 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1561 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1562 | .compat_setsockopt = compat_ipv6_setsockopt, |
1563 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1564 | #endif |
4fab9071 | 1565 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1566 | }; |
1567 | ||
cfb6eeb4 | 1568 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1569 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1570 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1571 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1572 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1573 | }; |
a928630a | 1574 | #endif |
cfb6eeb4 | 1575 | |
1da177e4 LT |
1576 | /* |
1577 | * TCP over IPv4 via INET6 API | |
1578 | */ | |
3b401a81 | 1579 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1580 | .queue_xmit = ip_queue_xmit, |
1581 | .send_check = tcp_v4_send_check, | |
1582 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1583 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1584 | .conn_request = tcp_v6_conn_request, |
1585 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1586 | .net_header_len = sizeof(struct iphdr), |
1587 | .setsockopt = ipv6_setsockopt, | |
1588 | .getsockopt = ipv6_getsockopt, | |
1589 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1590 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1591 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1592 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1593 | .compat_setsockopt = compat_ipv6_setsockopt, |
1594 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1595 | #endif |
4fab9071 | 1596 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1597 | }; |
1598 | ||
cfb6eeb4 | 1599 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1600 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1601 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1602 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1603 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1604 | }; |
a928630a | 1605 | #endif |
cfb6eeb4 | 1606 | |
1da177e4 LT |
1607 | /* NOTE: A lot of things set to zero explicitly by call to |
1608 | * sk_alloc() so need not be done here. | |
1609 | */ | |
1610 | static int tcp_v6_init_sock(struct sock *sk) | |
1611 | { | |
6687e988 | 1612 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1613 | |
900f65d3 | 1614 | tcp_init_sock(sk); |
1da177e4 | 1615 | |
8292a17a | 1616 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1617 | |
cfb6eeb4 | 1618 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1619 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1620 | #endif |
1621 | ||
1da177e4 LT |
1622 | return 0; |
1623 | } | |
1624 | ||
7d06b2e0 | 1625 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1626 | { |
1da177e4 | 1627 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1628 | inet6_destroy_sock(sk); |
1da177e4 LT |
1629 | } |
1630 | ||
952a10be | 1631 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1632 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1633 | static void get_openreq6(struct seq_file *seq, |
d4f06873 | 1634 | struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1635 | { |
fa76ce73 | 1636 | long ttd = req->rsk_timer.expires - jiffies; |
634fb979 ED |
1637 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1638 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1639 | |
1640 | if (ttd < 0) | |
1641 | ttd = 0; | |
1642 | ||
1da177e4 LT |
1643 | seq_printf(seq, |
1644 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1645 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1646 | i, |
1647 | src->s6_addr32[0], src->s6_addr32[1], | |
1648 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1649 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1650 | dest->s6_addr32[0], dest->s6_addr32[1], |
1651 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1652 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1653 | TCP_SYN_RECV, |
4c99aa40 | 1654 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1655 | 1, /* timers active (only the expire timer) */ |
1656 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1657 | req->num_timeout, |
a7cb5a49 | 1658 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1659 | 0, /* non standard timer */ |
1da177e4 LT |
1660 | 0, /* open_requests have no inode */ |
1661 | 0, req); | |
1662 | } | |
1663 | ||
1664 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1665 | { | |
b71d1d42 | 1666 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1667 | __u16 destp, srcp; |
1668 | int timer_active; | |
1669 | unsigned long timer_expires; | |
cf533ea5 ED |
1670 | const struct inet_sock *inet = inet_sk(sp); |
1671 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1672 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1673 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1674 | |
efe4208f ED |
1675 | dest = &sp->sk_v6_daddr; |
1676 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1677 | destp = ntohs(inet->inet_dport); |
1678 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1679 | |
1680 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1681 | timer_active = 1; |
463c84b9 ACM |
1682 | timer_expires = icsk->icsk_timeout; |
1683 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1684 | timer_active = 4; |
463c84b9 | 1685 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1686 | } else if (timer_pending(&sp->sk_timer)) { |
1687 | timer_active = 2; | |
1688 | timer_expires = sp->sk_timer.expires; | |
1689 | } else { | |
1690 | timer_active = 0; | |
1691 | timer_expires = jiffies; | |
1692 | } | |
1693 | ||
1694 | seq_printf(seq, | |
1695 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1696 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1697 | i, |
1698 | src->s6_addr32[0], src->s6_addr32[1], | |
1699 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1700 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1701 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1702 | sp->sk_state, |
47da8ee6 SS |
1703 | tp->write_seq-tp->snd_una, |
1704 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1705 | timer_active, |
a399a805 | 1706 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1707 | icsk->icsk_retransmits, |
a7cb5a49 | 1708 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1709 | icsk->icsk_probes_out, |
1da177e4 LT |
1710 | sock_i_ino(sp), |
1711 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1712 | jiffies_to_clock_t(icsk->icsk_rto), |
1713 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1714 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1715 | tp->snd_cwnd, |
0a672f74 YC |
1716 | sp->sk_state == TCP_LISTEN ? |
1717 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1718 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1719 | ); |
1720 | } | |
1721 | ||
1ab1457c | 1722 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1723 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1724 | { |
789f558c | 1725 | long delta = tw->tw_timer.expires - jiffies; |
b71d1d42 | 1726 | const struct in6_addr *dest, *src; |
1da177e4 | 1727 | __u16 destp, srcp; |
1da177e4 | 1728 | |
efe4208f ED |
1729 | dest = &tw->tw_v6_daddr; |
1730 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1731 | destp = ntohs(tw->tw_dport); |
1732 | srcp = ntohs(tw->tw_sport); | |
1733 | ||
1734 | seq_printf(seq, | |
1735 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1736 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1737 | i, |
1738 | src->s6_addr32[0], src->s6_addr32[1], | |
1739 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1740 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1741 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1742 | tw->tw_substate, 0, 0, | |
a399a805 | 1743 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1744 | atomic_read(&tw->tw_refcnt), tw); |
1745 | } | |
1746 | ||
1da177e4 LT |
1747 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1748 | { | |
1749 | struct tcp_iter_state *st; | |
05dbc7b5 | 1750 | struct sock *sk = v; |
1da177e4 LT |
1751 | |
1752 | if (v == SEQ_START_TOKEN) { | |
1753 | seq_puts(seq, | |
1754 | " sl " | |
1755 | "local_address " | |
1756 | "remote_address " | |
1757 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1758 | " uid timeout inode\n"); | |
1759 | goto out; | |
1760 | } | |
1761 | st = seq->private; | |
1762 | ||
1763 | switch (st->state) { | |
1764 | case TCP_SEQ_STATE_LISTENING: | |
1765 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1766 | if (sk->sk_state == TCP_TIME_WAIT) |
1767 | get_timewait6_sock(seq, v, st->num); | |
1768 | else | |
1769 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1770 | break; |
1771 | case TCP_SEQ_STATE_OPENREQ: | |
d4f06873 | 1772 | get_openreq6(seq, v, st->num, st->uid); |
1da177e4 | 1773 | break; |
1da177e4 LT |
1774 | } |
1775 | out: | |
1776 | return 0; | |
1777 | } | |
1778 | ||
73cb88ec AV |
1779 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1780 | .owner = THIS_MODULE, | |
1781 | .open = tcp_seq_open, | |
1782 | .read = seq_read, | |
1783 | .llseek = seq_lseek, | |
1784 | .release = seq_release_net | |
1785 | }; | |
1786 | ||
1da177e4 | 1787 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1788 | .name = "tcp6", |
1789 | .family = AF_INET6, | |
73cb88ec | 1790 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1791 | .seq_ops = { |
1792 | .show = tcp6_seq_show, | |
1793 | }, | |
1da177e4 LT |
1794 | }; |
1795 | ||
2c8c1e72 | 1796 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1797 | { |
6f8b13bc | 1798 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1799 | } |
1800 | ||
6f8b13bc | 1801 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1802 | { |
6f8b13bc | 1803 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1804 | } |
1805 | #endif | |
1806 | ||
f77d6021 ED |
1807 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1808 | { | |
1809 | struct inet_sock *inet = inet_sk(sk); | |
1810 | ||
1811 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1812 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1813 | ||
1814 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1815 | memset(&inet->pinet6 + 1, 0, size); | |
1816 | } | |
1817 | ||
1da177e4 LT |
1818 | struct proto tcpv6_prot = { |
1819 | .name = "TCPv6", | |
1820 | .owner = THIS_MODULE, | |
1821 | .close = tcp_close, | |
1822 | .connect = tcp_v6_connect, | |
1823 | .disconnect = tcp_disconnect, | |
463c84b9 | 1824 | .accept = inet_csk_accept, |
1da177e4 LT |
1825 | .ioctl = tcp_ioctl, |
1826 | .init = tcp_v6_init_sock, | |
1827 | .destroy = tcp_v6_destroy_sock, | |
1828 | .shutdown = tcp_shutdown, | |
1829 | .setsockopt = tcp_setsockopt, | |
1830 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1831 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1832 | .sendmsg = tcp_sendmsg, |
1833 | .sendpage = tcp_sendpage, | |
1da177e4 | 1834 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1835 | .release_cb = tcp_release_cb, |
77a6a471 | 1836 | .hash = inet_hash, |
ab1e0a13 ACM |
1837 | .unhash = inet_unhash, |
1838 | .get_port = inet_csk_get_port, | |
1da177e4 | 1839 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1840 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1841 | .sockets_allocated = &tcp_sockets_allocated, |
1842 | .memory_allocated = &tcp_memory_allocated, | |
1843 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1844 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1845 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1846 | .sysctl_wmem = sysctl_tcp_wmem, |
1847 | .sysctl_rmem = sysctl_tcp_rmem, | |
1848 | .max_header = MAX_TCP_HEADER, | |
1849 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1850 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1851 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1852 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1853 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1854 | .no_autobind = true, |
543d9cfe ACM |
1855 | #ifdef CONFIG_COMPAT |
1856 | .compat_setsockopt = compat_tcp_setsockopt, | |
1857 | .compat_getsockopt = compat_tcp_getsockopt, | |
1858 | #endif | |
c255a458 | 1859 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1860 | .proto_cgroup = tcp_proto_cgroup, |
1861 | #endif | |
f77d6021 | 1862 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1863 | }; |
1864 | ||
41135cc8 | 1865 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1866 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1867 | .handler = tcp_v6_rcv, |
1868 | .err_handler = tcp_v6_err, | |
1869 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1870 | }; | |
1871 | ||
1da177e4 LT |
1872 | static struct inet_protosw tcpv6_protosw = { |
1873 | .type = SOCK_STREAM, | |
1874 | .protocol = IPPROTO_TCP, | |
1875 | .prot = &tcpv6_prot, | |
1876 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1877 | .flags = INET_PROTOSW_PERMANENT | |
1878 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1879 | }; |
1880 | ||
2c8c1e72 | 1881 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1882 | { |
5677242f DL |
1883 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1884 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1885 | } |
1886 | ||
2c8c1e72 | 1887 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1888 | { |
5677242f | 1889 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1890 | } |
1891 | ||
2c8c1e72 | 1892 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1893 | { |
1894 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1895 | } |
1896 | ||
1897 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1898 | .init = tcpv6_net_init, |
1899 | .exit = tcpv6_net_exit, | |
1900 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1901 | }; |
1902 | ||
7f4e4868 | 1903 | int __init tcpv6_init(void) |
1da177e4 | 1904 | { |
7f4e4868 DL |
1905 | int ret; |
1906 | ||
3336288a VY |
1907 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1908 | if (ret) | |
c6b641a4 | 1909 | goto out; |
3336288a | 1910 | |
1da177e4 | 1911 | /* register inet6 protocol */ |
7f4e4868 DL |
1912 | ret = inet6_register_protosw(&tcpv6_protosw); |
1913 | if (ret) | |
1914 | goto out_tcpv6_protocol; | |
1915 | ||
93ec926b | 1916 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1917 | if (ret) |
1918 | goto out_tcpv6_protosw; | |
1919 | out: | |
1920 | return ret; | |
ae0f7d5f | 1921 | |
7f4e4868 DL |
1922 | out_tcpv6_protosw: |
1923 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1924 | out_tcpv6_protocol: |
1925 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1926 | goto out; |
1927 | } | |
1928 | ||
09f7709f | 1929 | void tcpv6_exit(void) |
7f4e4868 | 1930 | { |
93ec926b | 1931 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1932 | inet6_unregister_protosw(&tcpv6_protosw); |
1933 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1934 | } |