Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
3d58b5fa | 62 | #include <net/inet_common.h> |
6e5714ea | 63 | #include <net/secure_seq.h> |
d1a4c0b3 | 64 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 65 | #include <net/busy_poll.h> |
1da177e4 | 66 | |
1da177e4 LT |
67 | #include <linux/proc_fs.h> |
68 | #include <linux/seq_file.h> | |
69 | ||
cfb6eeb4 YH |
70 | #include <linux/crypto.h> |
71 | #include <linux/scatterlist.h> | |
72 | ||
cfb6eeb4 | 73 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
74 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
75 | struct request_sock *req); | |
1da177e4 LT |
76 | |
77 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 78 | |
3b401a81 SH |
79 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
80 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 81 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
82 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
84 | #else |
85 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 86 | const struct in6_addr *addr) |
9501f972 YH |
87 | { |
88 | return NULL; | |
89 | } | |
a928630a | 90 | #endif |
1da177e4 | 91 | |
fae6ef87 NC |
92 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
93 | { | |
94 | struct dst_entry *dst = skb_dst(skb); | |
fae6ef87 | 95 | |
ca777eff ED |
96 | if (dst) { |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
102 | if (rt->rt6i_node) | |
103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
104 | } | |
fae6ef87 NC |
105 | } |
106 | ||
1da177e4 LT |
107 | static void tcp_v6_hash(struct sock *sk) |
108 | { | |
109 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 110 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
111 | tcp_prot.hash(sk); |
112 | return; | |
113 | } | |
114 | local_bh_disable(); | |
9327f705 | 115 | __inet6_hash(sk, NULL); |
1da177e4 LT |
116 | local_bh_enable(); |
117 | } | |
118 | } | |
119 | ||
cf533ea5 | 120 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 121 | { |
0660e03f ACM |
122 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
123 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
124 | tcp_hdr(skb)->dest, |
125 | tcp_hdr(skb)->source); | |
1da177e4 LT |
126 | } |
127 | ||
1ab1457c | 128 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
129 | int addr_len) |
130 | { | |
131 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 132 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 133 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
134 | struct ipv6_pinfo *np = inet6_sk(sk); |
135 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 136 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 137 | struct rt6_info *rt; |
4c9483b2 | 138 | struct flowi6 fl6; |
1da177e4 LT |
139 | struct dst_entry *dst; |
140 | int addr_type; | |
141 | int err; | |
142 | ||
1ab1457c | 143 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
144 | return -EINVAL; |
145 | ||
1ab1457c | 146 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 147 | return -EAFNOSUPPORT; |
1da177e4 | 148 | |
4c9483b2 | 149 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
150 | |
151 | if (np->sndflow) { | |
4c9483b2 DM |
152 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
153 | IP6_ECN_flow_init(fl6.flowlabel); | |
154 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 155 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 156 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
157 | if (flowlabel == NULL) |
158 | return -EINVAL; | |
1da177e4 LT |
159 | fl6_sock_release(flowlabel); |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
1ab1457c YH |
164 | * connect() to INADDR_ANY means loopback (BSD'ism). |
165 | */ | |
166 | ||
4c99aa40 | 167 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 168 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
169 | |
170 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
171 | ||
4c99aa40 | 172 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
173 | return -ENETUNREACH; |
174 | ||
175 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
176 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
177 | usin->sin6_scope_id) { | |
178 | /* If interface is set while binding, indices | |
179 | * must coincide. | |
180 | */ | |
181 | if (sk->sk_bound_dev_if && | |
182 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
183 | return -EINVAL; | |
184 | ||
185 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
186 | } | |
187 | ||
188 | /* Connect to link-local address requires an interface */ | |
189 | if (!sk->sk_bound_dev_if) | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 194 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
195 | tp->rx_opt.ts_recent = 0; |
196 | tp->rx_opt.ts_recent_stamp = 0; | |
197 | tp->write_seq = 0; | |
198 | } | |
199 | ||
efe4208f | 200 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 201 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
202 | |
203 | /* | |
204 | * TCP over IPv4 | |
205 | */ | |
206 | ||
207 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 208 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
209 | struct sockaddr_in sin; |
210 | ||
211 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
212 | ||
213 | if (__ipv6_only_sock(sk)) | |
214 | return -ENETUNREACH; | |
215 | ||
216 | sin.sin_family = AF_INET; | |
217 | sin.sin_port = usin->sin6_port; | |
218 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
219 | ||
d83d8461 | 220 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 221 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
222 | #ifdef CONFIG_TCP_MD5SIG |
223 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
224 | #endif | |
1da177e4 LT |
225 | |
226 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
227 | ||
228 | if (err) { | |
d83d8461 ACM |
229 | icsk->icsk_ext_hdr_len = exthdrlen; |
230 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 231 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
232 | #ifdef CONFIG_TCP_MD5SIG |
233 | tp->af_specific = &tcp_sock_ipv6_specific; | |
234 | #endif | |
1da177e4 LT |
235 | goto failure; |
236 | } else { | |
c720c7e8 ED |
237 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
238 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
efe4208f | 239 | &sk->sk_v6_rcv_saddr); |
1da177e4 LT |
240 | } |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
efe4208f ED |
245 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
246 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 247 | |
4c9483b2 | 248 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 249 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 250 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
251 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
252 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
253 | fl6.fl6_dport = usin->sin6_port; |
254 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 255 | |
4c9483b2 | 256 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 257 | |
4c9483b2 | 258 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 259 | |
0e0d44ab | 260 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
261 | if (IS_ERR(dst)) { |
262 | err = PTR_ERR(dst); | |
1da177e4 | 263 | goto failure; |
14e50e57 | 264 | } |
1da177e4 LT |
265 | |
266 | if (saddr == NULL) { | |
4c9483b2 | 267 | saddr = &fl6.saddr; |
efe4208f | 268 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
269 | } |
270 | ||
271 | /* set the source address */ | |
4e3fd7a0 | 272 | np->saddr = *saddr; |
c720c7e8 | 273 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 274 | |
f83ef8c0 | 275 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 276 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 277 | |
493f377d DM |
278 | rt = (struct rt6_info *) dst; |
279 | if (tcp_death_row.sysctl_tw_recycle && | |
280 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 281 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 282 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 283 | |
d83d8461 | 284 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 285 | if (np->opt) |
d83d8461 ACM |
286 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
287 | np->opt->opt_nflen); | |
1da177e4 LT |
288 | |
289 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
290 | ||
c720c7e8 | 291 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
292 | |
293 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 294 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
295 | if (err) |
296 | goto late_failure; | |
297 | ||
9e7ceb06 SP |
298 | ip6_set_txhash(sk); |
299 | ||
2b916477 | 300 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 301 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 302 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
303 | inet->inet_sport, |
304 | inet->inet_dport); | |
1da177e4 LT |
305 | |
306 | err = tcp_connect(sk); | |
307 | if (err) | |
308 | goto late_failure; | |
309 | ||
310 | return 0; | |
311 | ||
312 | late_failure: | |
313 | tcp_set_state(sk, TCP_CLOSE); | |
314 | __sk_dst_reset(sk); | |
315 | failure: | |
c720c7e8 | 316 | inet->inet_dport = 0; |
1da177e4 LT |
317 | sk->sk_route_caps = 0; |
318 | return err; | |
319 | } | |
320 | ||
563d34d0 ED |
321 | static void tcp_v6_mtu_reduced(struct sock *sk) |
322 | { | |
323 | struct dst_entry *dst; | |
324 | ||
325 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
326 | return; | |
327 | ||
328 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
329 | if (!dst) | |
330 | return; | |
331 | ||
332 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
333 | tcp_sync_mss(sk, dst_mtu(dst)); | |
334 | tcp_simple_retransmit(sk); | |
335 | } | |
336 | } | |
337 | ||
1da177e4 | 338 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 339 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 340 | { |
4c99aa40 | 341 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 342 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
343 | struct ipv6_pinfo *np; |
344 | struct sock *sk; | |
345 | int err; | |
1ab1457c | 346 | struct tcp_sock *tp; |
0a672f74 YC |
347 | struct request_sock *fastopen; |
348 | __u32 seq, snd_una; | |
ca12a1a4 | 349 | struct net *net = dev_net(skb->dev); |
1da177e4 | 350 | |
ca12a1a4 | 351 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 352 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
353 | |
354 | if (sk == NULL) { | |
e41b5368 DL |
355 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
356 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
357 | return; |
358 | } | |
359 | ||
360 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 361 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
362 | return; |
363 | } | |
364 | ||
365 | bh_lock_sock(sk); | |
563d34d0 | 366 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 367 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
368 | |
369 | if (sk->sk_state == TCP_CLOSE) | |
370 | goto out; | |
371 | ||
e802af9c SH |
372 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
373 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
374 | goto out; | |
375 | } | |
376 | ||
1da177e4 | 377 | tp = tcp_sk(sk); |
1ab1457c | 378 | seq = ntohl(th->seq); |
0a672f74 YC |
379 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
380 | fastopen = tp->fastopen_rsk; | |
381 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 382 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 383 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 384 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
385 | goto out; |
386 | } | |
387 | ||
388 | np = inet6_sk(sk); | |
389 | ||
ec18d9a2 DM |
390 | if (type == NDISC_REDIRECT) { |
391 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
392 | ||
1ed5c48f | 393 | if (dst) |
6700c270 | 394 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 395 | goto out; |
ec18d9a2 DM |
396 | } |
397 | ||
1da177e4 | 398 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
399 | /* We are not interested in TCP_LISTEN and open_requests |
400 | * (SYN-ACKs send out by Linux are always <576bytes so | |
401 | * they should go through unfragmented). | |
402 | */ | |
403 | if (sk->sk_state == TCP_LISTEN) | |
404 | goto out; | |
405 | ||
93b36cf3 HFS |
406 | if (!ip6_sk_accept_pmtu(sk)) |
407 | goto out; | |
408 | ||
563d34d0 ED |
409 | tp->mtu_info = ntohl(info); |
410 | if (!sock_owned_by_user(sk)) | |
411 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
412 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
413 | &tp->tsq_flags)) | |
414 | sock_hold(sk); | |
1da177e4 LT |
415 | goto out; |
416 | } | |
417 | ||
418 | icmpv6_err_convert(type, code, &err); | |
419 | ||
60236fdd | 420 | /* Might be for an request_sock */ |
1da177e4 | 421 | switch (sk->sk_state) { |
60236fdd | 422 | struct request_sock *req, **prev; |
1da177e4 LT |
423 | case TCP_LISTEN: |
424 | if (sock_owned_by_user(sk)) | |
425 | goto out; | |
426 | ||
870c3151 | 427 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
8129765a ACM |
428 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
429 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
430 | if (!req) |
431 | goto out; | |
432 | ||
433 | /* ICMPs are not backlogged, hence we cannot get | |
434 | * an established socket here. | |
435 | */ | |
547b792c | 436 | WARN_ON(req->sk != NULL); |
1da177e4 | 437 | |
2e6599cb | 438 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 439 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
440 | goto out; |
441 | } | |
442 | ||
463c84b9 | 443 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 444 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
445 | goto out; |
446 | ||
447 | case TCP_SYN_SENT: | |
0a672f74 YC |
448 | case TCP_SYN_RECV: |
449 | /* Only in fast or simultaneous open. If a fast open socket is | |
450 | * is already accepted it is treated as a connected one below. | |
451 | */ | |
452 | if (fastopen && fastopen->sk == NULL) | |
453 | break; | |
454 | ||
1da177e4 | 455 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
456 | sk->sk_err = err; |
457 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
458 | ||
459 | tcp_done(sk); | |
460 | } else | |
461 | sk->sk_err_soft = err; | |
462 | goto out; | |
463 | } | |
464 | ||
465 | if (!sock_owned_by_user(sk) && np->recverr) { | |
466 | sk->sk_err = err; | |
467 | sk->sk_error_report(sk); | |
468 | } else | |
469 | sk->sk_err_soft = err; | |
470 | ||
471 | out: | |
472 | bh_unlock_sock(sk); | |
473 | sock_put(sk); | |
474 | } | |
475 | ||
476 | ||
9f10d3f6 | 477 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 478 | struct flowi *fl, |
3840a06e | 479 | struct request_sock *req, |
3a19ce0e DL |
480 | u16 queue_mapping, |
481 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 482 | { |
634fb979 | 483 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 484 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 485 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 486 | struct sk_buff *skb; |
9494218f | 487 | int err = -ENOMEM; |
1da177e4 | 488 | |
9f10d3f6 NC |
489 | /* First, grab a route. */ |
490 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 491 | goto done; |
9494218f | 492 | |
3a19ce0e | 493 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 494 | |
1da177e4 | 495 | if (skb) { |
634fb979 ED |
496 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
497 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 498 | |
634fb979 | 499 | fl6->daddr = ireq->ir_v6_rmt_addr; |
df3687ff FF |
500 | if (np->repflow && (ireq->pktopts != NULL)) |
501 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
502 | ||
fff32699 | 503 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 504 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 505 | err = net_xmit_eval(err); |
1da177e4 LT |
506 | } |
507 | ||
508 | done: | |
1da177e4 LT |
509 | return err; |
510 | } | |
511 | ||
72659ecc | 512 | |
60236fdd | 513 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 514 | { |
634fb979 | 515 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
516 | } |
517 | ||
cfb6eeb4 YH |
518 | #ifdef CONFIG_TCP_MD5SIG |
519 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 520 | const struct in6_addr *addr) |
cfb6eeb4 | 521 | { |
a915da9b | 522 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
523 | } |
524 | ||
525 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
526 | struct sock *addr_sk) | |
527 | { | |
efe4208f | 528 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
529 | } |
530 | ||
531 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
532 | struct request_sock *req) | |
533 | { | |
634fb979 | 534 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
535 | } |
536 | ||
4aa956d8 WY |
537 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
538 | int optlen) | |
cfb6eeb4 YH |
539 | { |
540 | struct tcp_md5sig cmd; | |
541 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
542 | |
543 | if (optlen < sizeof(cmd)) | |
544 | return -EINVAL; | |
545 | ||
546 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
547 | return -EFAULT; | |
548 | ||
549 | if (sin6->sin6_family != AF_INET6) | |
550 | return -EINVAL; | |
551 | ||
552 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 553 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
554 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
555 | AF_INET); | |
556 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
557 | AF_INET6); | |
cfb6eeb4 YH |
558 | } |
559 | ||
560 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
561 | return -EINVAL; | |
562 | ||
a915da9b ED |
563 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
564 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
565 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 566 | |
a915da9b ED |
567 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
568 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
569 | } |
570 | ||
49a72dfb | 571 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
572 | const struct in6_addr *daddr, |
573 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 574 | { |
cfb6eeb4 | 575 | struct tcp6_pseudohdr *bp; |
49a72dfb | 576 | struct scatterlist sg; |
8d26d76d | 577 | |
cfb6eeb4 | 578 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 579 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
580 | bp->saddr = *saddr; |
581 | bp->daddr = *daddr; | |
49a72dfb | 582 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 583 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 584 | |
49a72dfb AL |
585 | sg_init_one(&sg, bp, sizeof(*bp)); |
586 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
587 | } | |
c7da57a1 | 588 | |
49a72dfb | 589 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 590 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 591 | const struct tcphdr *th) |
49a72dfb AL |
592 | { |
593 | struct tcp_md5sig_pool *hp; | |
594 | struct hash_desc *desc; | |
595 | ||
596 | hp = tcp_get_md5sig_pool(); | |
597 | if (!hp) | |
598 | goto clear_hash_noput; | |
599 | desc = &hp->md5_desc; | |
600 | ||
601 | if (crypto_hash_init(desc)) | |
602 | goto clear_hash; | |
603 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
604 | goto clear_hash; | |
605 | if (tcp_md5_hash_header(hp, th)) | |
606 | goto clear_hash; | |
607 | if (tcp_md5_hash_key(hp, key)) | |
608 | goto clear_hash; | |
609 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 610 | goto clear_hash; |
cfb6eeb4 | 611 | |
cfb6eeb4 | 612 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 613 | return 0; |
49a72dfb | 614 | |
cfb6eeb4 YH |
615 | clear_hash: |
616 | tcp_put_md5sig_pool(); | |
617 | clear_hash_noput: | |
618 | memset(md5_hash, 0, 16); | |
49a72dfb | 619 | return 1; |
cfb6eeb4 YH |
620 | } |
621 | ||
49a72dfb | 622 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
623 | const struct sock *sk, |
624 | const struct request_sock *req, | |
625 | const struct sk_buff *skb) | |
cfb6eeb4 | 626 | { |
b71d1d42 | 627 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
628 | struct tcp_md5sig_pool *hp; |
629 | struct hash_desc *desc; | |
318cf7aa | 630 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
631 | |
632 | if (sk) { | |
633 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 634 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 635 | } else if (req) { |
634fb979 ED |
636 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
637 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; | |
49a72dfb | 638 | } else { |
b71d1d42 | 639 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
640 | saddr = &ip6h->saddr; |
641 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 642 | } |
49a72dfb AL |
643 | |
644 | hp = tcp_get_md5sig_pool(); | |
645 | if (!hp) | |
646 | goto clear_hash_noput; | |
647 | desc = &hp->md5_desc; | |
648 | ||
649 | if (crypto_hash_init(desc)) | |
650 | goto clear_hash; | |
651 | ||
652 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
653 | goto clear_hash; | |
654 | if (tcp_md5_hash_header(hp, th)) | |
655 | goto clear_hash; | |
656 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
657 | goto clear_hash; | |
658 | if (tcp_md5_hash_key(hp, key)) | |
659 | goto clear_hash; | |
660 | if (crypto_hash_final(desc, md5_hash)) | |
661 | goto clear_hash; | |
662 | ||
663 | tcp_put_md5sig_pool(); | |
664 | return 0; | |
665 | ||
666 | clear_hash: | |
667 | tcp_put_md5sig_pool(); | |
668 | clear_hash_noput: | |
669 | memset(md5_hash, 0, 16); | |
670 | return 1; | |
cfb6eeb4 YH |
671 | } |
672 | ||
9ea88a15 DP |
673 | static int __tcp_v6_inbound_md5_hash(struct sock *sk, |
674 | const struct sk_buff *skb) | |
cfb6eeb4 | 675 | { |
cf533ea5 | 676 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 677 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 678 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 679 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 680 | int genhash; |
cfb6eeb4 YH |
681 | u8 newhash[16]; |
682 | ||
683 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 684 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 685 | |
785957d3 DM |
686 | /* We've parsed the options - do we have a hash? */ |
687 | if (!hash_expected && !hash_location) | |
688 | return 0; | |
689 | ||
690 | if (hash_expected && !hash_location) { | |
691 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
692 | return 1; |
693 | } | |
694 | ||
785957d3 DM |
695 | if (!hash_expected && hash_location) { |
696 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
697 | return 1; |
698 | } | |
699 | ||
700 | /* check the signature */ | |
49a72dfb AL |
701 | genhash = tcp_v6_md5_hash_skb(newhash, |
702 | hash_expected, | |
703 | NULL, NULL, skb); | |
704 | ||
cfb6eeb4 | 705 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
706 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
707 | genhash ? "failed" : "mismatch", | |
708 | &ip6h->saddr, ntohs(th->source), | |
709 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
710 | return 1; |
711 | } | |
712 | return 0; | |
713 | } | |
9ea88a15 DP |
714 | |
715 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) | |
716 | { | |
717 | int ret; | |
718 | ||
719 | rcu_read_lock(); | |
720 | ret = __tcp_v6_inbound_md5_hash(sk, skb); | |
721 | rcu_read_unlock(); | |
722 | ||
723 | return ret; | |
724 | } | |
725 | ||
cfb6eeb4 YH |
726 | #endif |
727 | ||
16bea70a OP |
728 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
729 | struct sk_buff *skb) | |
730 | { | |
731 | struct inet_request_sock *ireq = inet_rsk(req); | |
732 | struct ipv6_pinfo *np = inet6_sk(sk); | |
733 | ||
734 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
735 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
736 | ||
16bea70a OP |
737 | /* So that link locals have meaning */ |
738 | if (!sk->sk_bound_dev_if && | |
739 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
870c3151 | 740 | ireq->ir_iif = tcp_v6_iif(skb); |
16bea70a | 741 | |
04317daf | 742 | if (!TCP_SKB_CB(skb)->tcp_tw_isn && |
a224772d ED |
743 | (ipv6_opt_accepted(sk, skb, &TCP_SKB_CB(skb)->header.h6) || |
744 | np->rxopt.bits.rxinfo || | |
16bea70a OP |
745 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || |
746 | np->rxopt.bits.rxohlim || np->repflow)) { | |
747 | atomic_inc(&skb->users); | |
748 | ireq->pktopts = skb; | |
749 | } | |
3f66b083 | 750 | ireq->ireq_family = AF_INET6; |
16bea70a OP |
751 | } |
752 | ||
d94e0417 OP |
753 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
754 | const struct request_sock *req, | |
755 | bool *strict) | |
756 | { | |
757 | if (strict) | |
758 | *strict = true; | |
759 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
760 | } | |
761 | ||
c6aefafb | 762 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 763 | .family = AF_INET6, |
2e6599cb | 764 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 765 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
766 | .send_ack = tcp_v6_reqsk_send_ack, |
767 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 768 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 769 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
770 | }; |
771 | ||
b2e4b3de | 772 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
773 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
774 | sizeof(struct ipv6hdr), | |
16bea70a | 775 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 776 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 777 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 778 | #endif |
16bea70a | 779 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
780 | #ifdef CONFIG_SYN_COOKIES |
781 | .cookie_init_seq = cookie_v6_init_sequence, | |
782 | #endif | |
d94e0417 | 783 | .route_req = tcp_v6_route_req, |
936b8bdb | 784 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 785 | .send_synack = tcp_v6_send_synack, |
695da14e | 786 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 787 | }; |
cfb6eeb4 | 788 | |
0f85feae ED |
789 | static void tcp_v6_send_response(struct sock *sk, struct sk_buff *skb, u32 seq, |
790 | u32 ack, u32 win, u32 tsval, u32 tsecr, | |
791 | int oif, struct tcp_md5sig_key *key, int rst, | |
792 | u8 tclass, u32 label) | |
1da177e4 | 793 | { |
cf533ea5 ED |
794 | const struct tcphdr *th = tcp_hdr(skb); |
795 | struct tcphdr *t1; | |
1da177e4 | 796 | struct sk_buff *buff; |
4c9483b2 | 797 | struct flowi6 fl6; |
0f85feae | 798 | struct net *net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev); |
e5047992 | 799 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 800 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 801 | struct dst_entry *dst; |
81ada62d | 802 | __be32 *topt; |
1da177e4 | 803 | |
ee684b6f | 804 | if (tsecr) |
626e264d | 805 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 806 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
807 | if (key) |
808 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
809 | #endif | |
810 | ||
cfb6eeb4 | 811 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 812 | GFP_ATOMIC); |
1ab1457c YH |
813 | if (buff == NULL) |
814 | return; | |
1da177e4 | 815 | |
cfb6eeb4 | 816 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 817 | |
cfb6eeb4 | 818 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 819 | skb_reset_transport_header(buff); |
1da177e4 LT |
820 | |
821 | /* Swap the send and the receive. */ | |
822 | memset(t1, 0, sizeof(*t1)); | |
823 | t1->dest = th->source; | |
824 | t1->source = th->dest; | |
cfb6eeb4 | 825 | t1->doff = tot_len / 4; |
626e264d IJ |
826 | t1->seq = htonl(seq); |
827 | t1->ack_seq = htonl(ack); | |
828 | t1->ack = !rst || !th->ack; | |
829 | t1->rst = rst; | |
830 | t1->window = htons(win); | |
1da177e4 | 831 | |
81ada62d IJ |
832 | topt = (__be32 *)(t1 + 1); |
833 | ||
ee684b6f | 834 | if (tsecr) { |
626e264d IJ |
835 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
836 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
837 | *topt++ = htonl(tsval); |
838 | *topt++ = htonl(tsecr); | |
626e264d IJ |
839 | } |
840 | ||
cfb6eeb4 YH |
841 | #ifdef CONFIG_TCP_MD5SIG |
842 | if (key) { | |
81ada62d IJ |
843 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
844 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
845 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
846 | &ipv6_hdr(skb)->saddr, |
847 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
848 | } |
849 | #endif | |
850 | ||
4c9483b2 | 851 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
852 | fl6.daddr = ipv6_hdr(skb)->saddr; |
853 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 854 | fl6.flowlabel = label; |
1da177e4 | 855 | |
e5700aff DM |
856 | buff->ip_summed = CHECKSUM_PARTIAL; |
857 | buff->csum = 0; | |
858 | ||
4c9483b2 | 859 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 860 | |
4c9483b2 | 861 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 862 | if (rt6_need_strict(&fl6.daddr) && !oif) |
870c3151 | 863 | fl6.flowi6_oif = tcp_v6_iif(skb); |
9c76a114 WY |
864 | else |
865 | fl6.flowi6_oif = oif; | |
e110861f | 866 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
867 | fl6.fl6_dport = t1->dest; |
868 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 869 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 870 | |
c20121ae DL |
871 | /* Pass a socket to ip6_dst_lookup either it is for RST |
872 | * Underlying function will use this to retrieve the network | |
873 | * namespace | |
874 | */ | |
0e0d44ab | 875 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
876 | if (!IS_ERR(dst)) { |
877 | skb_dst_set(buff, dst); | |
b903d324 | 878 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
879 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
880 | if (rst) | |
881 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
882 | return; | |
1da177e4 LT |
883 | } |
884 | ||
885 | kfree_skb(buff); | |
886 | } | |
887 | ||
626e264d | 888 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 889 | { |
cf533ea5 | 890 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 891 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 892 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
893 | #ifdef CONFIG_TCP_MD5SIG |
894 | const __u8 *hash_location = NULL; | |
895 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
896 | unsigned char newhash[16]; | |
897 | int genhash; | |
898 | struct sock *sk1 = NULL; | |
899 | #endif | |
9c76a114 | 900 | int oif; |
1da177e4 | 901 | |
626e264d | 902 | if (th->rst) |
1da177e4 LT |
903 | return; |
904 | ||
c3658e8d ED |
905 | /* If sk not NULL, it means we did a successful lookup and incoming |
906 | * route had to be correct. prequeue might have dropped our dst. | |
907 | */ | |
908 | if (!sk && !ipv6_unicast_destination(skb)) | |
626e264d | 909 | return; |
1da177e4 | 910 | |
cfb6eeb4 | 911 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
912 | hash_location = tcp_parse_md5sig_option(th); |
913 | if (!sk && hash_location) { | |
914 | /* | |
915 | * active side is lost. Try to find listening socket through | |
916 | * source port, and then find md5 key through listening socket. | |
917 | * we are not loose security here: | |
918 | * Incoming packet is checked with md5 hash with finding key, | |
919 | * no RST generated if md5 hash doesn't match. | |
920 | */ | |
921 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
922 | &tcp_hashinfo, &ipv6h->saddr, |
923 | th->source, &ipv6h->daddr, | |
870c3151 | 924 | ntohs(th->source), tcp_v6_iif(skb)); |
658ddaaf SL |
925 | if (!sk1) |
926 | return; | |
927 | ||
928 | rcu_read_lock(); | |
929 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
930 | if (!key) | |
931 | goto release_sk1; | |
932 | ||
933 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
934 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
935 | goto release_sk1; | |
936 | } else { | |
937 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
938 | } | |
cfb6eeb4 YH |
939 | #endif |
940 | ||
626e264d IJ |
941 | if (th->ack) |
942 | seq = ntohl(th->ack_seq); | |
943 | else | |
944 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
945 | (th->doff << 2); | |
1da177e4 | 946 | |
9c76a114 | 947 | oif = sk ? sk->sk_bound_dev_if : 0; |
0f85feae | 948 | tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); |
658ddaaf SL |
949 | |
950 | #ifdef CONFIG_TCP_MD5SIG | |
951 | release_sk1: | |
952 | if (sk1) { | |
953 | rcu_read_unlock(); | |
954 | sock_put(sk1); | |
955 | } | |
956 | #endif | |
626e264d | 957 | } |
1da177e4 | 958 | |
0f85feae ED |
959 | static void tcp_v6_send_ack(struct sock *sk, struct sk_buff *skb, u32 seq, |
960 | u32 ack, u32 win, u32 tsval, u32 tsecr, int oif, | |
1d13a96c FF |
961 | struct tcp_md5sig_key *key, u8 tclass, |
962 | u32 label) | |
626e264d | 963 | { |
0f85feae ED |
964 | tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, key, 0, |
965 | tclass, label); | |
1da177e4 LT |
966 | } |
967 | ||
968 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
969 | { | |
8feaf0c0 | 970 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 971 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 972 | |
0f85feae | 973 | tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 974 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 975 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 976 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 977 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 978 | |
8feaf0c0 | 979 | inet_twsk_put(tw); |
1da177e4 LT |
980 | } |
981 | ||
6edafaaf GJ |
982 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
983 | struct request_sock *req) | |
1da177e4 | 984 | { |
3a19ce0e DL |
985 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
986 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
987 | */ | |
0f85feae | 988 | tcp_v6_send_ack(sk, skb, (sk->sk_state == TCP_LISTEN) ? |
3a19ce0e | 989 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, |
0f85feae ED |
990 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, |
991 | tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, | |
1d13a96c FF |
992 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
993 | 0, 0); | |
1da177e4 LT |
994 | } |
995 | ||
996 | ||
4c99aa40 | 997 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 998 | { |
60236fdd | 999 | struct request_sock *req, **prev; |
aa8223c7 | 1000 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1001 | struct sock *nsk; |
1002 | ||
1003 | /* Find possible connection requests. */ | |
8129765a | 1004 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f | 1005 | &ipv6_hdr(skb)->saddr, |
870c3151 | 1006 | &ipv6_hdr(skb)->daddr, tcp_v6_iif(skb)); |
1da177e4 | 1007 | if (req) |
8336886f | 1008 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 1009 | |
3b1e0a65 | 1010 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
870c3151 ED |
1011 | &ipv6_hdr(skb)->saddr, th->source, |
1012 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), | |
1013 | tcp_v6_iif(skb)); | |
1da177e4 LT |
1014 | |
1015 | if (nsk) { | |
1016 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1017 | bh_lock_sock(nsk); | |
1018 | return nsk; | |
1019 | } | |
9469c7b4 | 1020 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1021 | return NULL; |
1022 | } | |
1023 | ||
c6aefafb | 1024 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 1025 | if (!th->syn) |
c6aefafb | 1026 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1027 | #endif |
1028 | return sk; | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1032 | { | |
1da177e4 LT |
1033 | if (skb->protocol == htons(ETH_P_IP)) |
1034 | return tcp_v4_conn_request(sk, skb); | |
1035 | ||
1036 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1037 | goto drop; |
1da177e4 | 1038 | |
1fb6f159 OP |
1039 | return tcp_conn_request(&tcp6_request_sock_ops, |
1040 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1041 | |
1042 | drop: | |
5f1e942c | 1043 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1044 | return 0; /* don't send reset */ |
1045 | } | |
1046 | ||
4c99aa40 WC |
1047 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
1048 | struct request_sock *req, | |
1049 | struct dst_entry *dst) | |
1da177e4 | 1050 | { |
634fb979 | 1051 | struct inet_request_sock *ireq; |
1da177e4 LT |
1052 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1053 | struct tcp6_sock *newtcp6sk; | |
1054 | struct inet_sock *newinet; | |
1055 | struct tcp_sock *newtp; | |
1056 | struct sock *newsk; | |
cfb6eeb4 YH |
1057 | #ifdef CONFIG_TCP_MD5SIG |
1058 | struct tcp_md5sig_key *key; | |
1059 | #endif | |
3840a06e | 1060 | struct flowi6 fl6; |
1da177e4 LT |
1061 | |
1062 | if (skb->protocol == htons(ETH_P_IP)) { | |
1063 | /* | |
1064 | * v6 mapped | |
1065 | */ | |
1066 | ||
1067 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1068 | ||
1ab1457c | 1069 | if (newsk == NULL) |
1da177e4 LT |
1070 | return NULL; |
1071 | ||
1072 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1073 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1074 | ||
1075 | newinet = inet_sk(newsk); | |
1076 | newnp = inet6_sk(newsk); | |
1077 | newtp = tcp_sk(newsk); | |
1078 | ||
1079 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1080 | ||
efe4208f | 1081 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1082 | |
c720c7e8 | 1083 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1084 | |
efe4208f | 1085 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1086 | |
8292a17a | 1087 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1088 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1089 | #ifdef CONFIG_TCP_MD5SIG |
1090 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1091 | #endif | |
1092 | ||
676a1184 YZ |
1093 | newnp->ipv6_ac_list = NULL; |
1094 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1095 | newnp->pktoptions = NULL; |
1096 | newnp->opt = NULL; | |
870c3151 | 1097 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1098 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1099 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1100 | if (np->repflow) |
1101 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1102 | |
e6848976 ACM |
1103 | /* |
1104 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1105 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1106 | * that function for the gory details. -acme | |
1da177e4 | 1107 | */ |
1da177e4 LT |
1108 | |
1109 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1110 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1111 | Sync it now. |
1112 | */ | |
d83d8461 | 1113 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1114 | |
1115 | return newsk; | |
1116 | } | |
1117 | ||
634fb979 | 1118 | ireq = inet_rsk(req); |
1da177e4 LT |
1119 | |
1120 | if (sk_acceptq_is_full(sk)) | |
1121 | goto out_overflow; | |
1122 | ||
493f377d | 1123 | if (!dst) { |
3840a06e | 1124 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1125 | if (!dst) |
1da177e4 | 1126 | goto out; |
1ab1457c | 1127 | } |
1da177e4 LT |
1128 | |
1129 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1130 | if (newsk == NULL) | |
093d2823 | 1131 | goto out_nonewsk; |
1da177e4 | 1132 | |
e6848976 ACM |
1133 | /* |
1134 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1135 | * count here, tcp_create_openreq_child now does this for us, see the | |
1136 | * comment in that function for the gory details. -acme | |
1137 | */ | |
1da177e4 | 1138 | |
59eed279 | 1139 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1140 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1141 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1142 | |
1143 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1144 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1145 | ||
1146 | newtp = tcp_sk(newsk); | |
1147 | newinet = inet_sk(newsk); | |
1148 | newnp = inet6_sk(newsk); | |
1149 | ||
1150 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1151 | ||
634fb979 ED |
1152 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1153 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1154 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1155 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1156 | |
b73c3d0e TH |
1157 | ip6_set_txhash(newsk); |
1158 | ||
1ab1457c | 1159 | /* Now IPv6 options... |
1da177e4 LT |
1160 | |
1161 | First: no IPv4 options. | |
1162 | */ | |
f6d8bd05 | 1163 | newinet->inet_opt = NULL; |
676a1184 | 1164 | newnp->ipv6_ac_list = NULL; |
d35690be | 1165 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1166 | |
1167 | /* Clone RX bits */ | |
1168 | newnp->rxopt.all = np->rxopt.all; | |
1169 | ||
1170 | /* Clone pktoptions received with SYN */ | |
1171 | newnp->pktoptions = NULL; | |
634fb979 ED |
1172 | if (ireq->pktopts != NULL) { |
1173 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1174 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1175 | consume_skb(ireq->pktopts); |
1176 | ireq->pktopts = NULL; | |
1da177e4 LT |
1177 | if (newnp->pktoptions) |
1178 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1179 | } | |
1180 | newnp->opt = NULL; | |
870c3151 | 1181 | newnp->mcast_oif = tcp_v6_iif(skb); |
0660e03f | 1182 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1183 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1184 | if (np->repflow) |
1185 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1186 | |
1187 | /* Clone native IPv6 options from listening socket (if any) | |
1188 | ||
1189 | Yes, keeping reference count would be much more clever, | |
1190 | but we make one more one thing there: reattach optmem | |
1191 | to newsk. | |
1192 | */ | |
43264e0b RL |
1193 | if (np->opt) |
1194 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1195 | |
d83d8461 | 1196 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1197 | if (newnp->opt) |
d83d8461 ACM |
1198 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1199 | newnp->opt->opt_flen); | |
1da177e4 | 1200 | |
81164413 DB |
1201 | tcp_ca_openreq_child(newsk, dst); |
1202 | ||
1da177e4 | 1203 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1204 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1205 | if (tcp_sk(sk)->rx_opt.user_mss && |
1206 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1207 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1208 | ||
1da177e4 LT |
1209 | tcp_initialize_rcv_mss(newsk); |
1210 | ||
c720c7e8 ED |
1211 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1212 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1213 | |
cfb6eeb4 YH |
1214 | #ifdef CONFIG_TCP_MD5SIG |
1215 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1216 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1217 | if (key != NULL) { | |
cfb6eeb4 YH |
1218 | /* We're using one, so create a matching key |
1219 | * on the newsk structure. If we fail to get | |
1220 | * memory, then we end up not copying the key | |
1221 | * across. Shucks. | |
1222 | */ | |
efe4208f | 1223 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1224 | AF_INET6, key->key, key->keylen, |
1225 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1226 | } |
1227 | #endif | |
1228 | ||
093d2823 | 1229 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1230 | inet_csk_prepare_forced_close(newsk); |
1231 | tcp_done(newsk); | |
093d2823 BS |
1232 | goto out; |
1233 | } | |
9327f705 | 1234 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1235 | |
1236 | return newsk; | |
1237 | ||
1238 | out_overflow: | |
de0744af | 1239 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1240 | out_nonewsk: |
1da177e4 | 1241 | dst_release(dst); |
093d2823 BS |
1242 | out: |
1243 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1244 | return NULL; |
1245 | } | |
1246 | ||
1da177e4 LT |
1247 | /* The socket must have it's spinlock held when we get |
1248 | * here. | |
1249 | * | |
1250 | * We have a potential double-lock case here, so even when | |
1251 | * doing backlog processing we use the BH locking scheme. | |
1252 | * This is because we cannot sleep with the original spinlock | |
1253 | * held. | |
1254 | */ | |
1255 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1256 | { | |
1257 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1258 | struct tcp_sock *tp; | |
1259 | struct sk_buff *opt_skb = NULL; | |
1260 | ||
1261 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1262 | goes to IPv4 receive handler and backlogged. | |
1263 | From backlog it always goes here. Kerboom... | |
1264 | Fortunately, tcp_rcv_established and rcv_established | |
1265 | handle them correctly, but it is not case with | |
1266 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1267 | */ | |
1268 | ||
1269 | if (skb->protocol == htons(ETH_P_IP)) | |
1270 | return tcp_v4_do_rcv(sk, skb); | |
1271 | ||
fda9ef5d | 1272 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1273 | goto discard; |
1274 | ||
1275 | /* | |
1276 | * socket locking is here for SMP purposes as backlog rcv | |
1277 | * is currently called with bh processing disabled. | |
1278 | */ | |
1279 | ||
1280 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1281 | ||
1282 | Yes, guys, it is the only place in our code, where we | |
1283 | may make it not affecting IPv4. | |
1284 | The rest of code is protocol independent, | |
1285 | and I do not like idea to uglify IPv4. | |
1286 | ||
1287 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1288 | looks not very well thought. For now we latch | |
1289 | options, received in the last packet, enqueued | |
1290 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1291 | --ANK (980728) |
1da177e4 LT |
1292 | */ |
1293 | if (np->rxopt.all) | |
99a1dec7 | 1294 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1295 | |
1296 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1297 | struct dst_entry *dst = sk->sk_rx_dst; |
1298 | ||
bdeab991 | 1299 | sock_rps_save_rxhash(sk, skb); |
3d97379a | 1300 | sk_mark_napi_id(sk, skb); |
5d299f3d ED |
1301 | if (dst) { |
1302 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1303 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1304 | dst_release(dst); | |
1305 | sk->sk_rx_dst = NULL; | |
1306 | } | |
1307 | } | |
1308 | ||
c995ae22 | 1309 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1310 | if (opt_skb) |
1311 | goto ipv6_pktoptions; | |
1312 | return 0; | |
1313 | } | |
1314 | ||
ab6a5bb6 | 1315 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1316 | goto csum_err; |
1317 | ||
1ab1457c | 1318 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1319 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1320 | if (!nsk) | |
1321 | goto discard; | |
1322 | ||
1323 | /* | |
1324 | * Queue it on the new socket if the new socket is active, | |
1325 | * otherwise we just shortcircuit this and continue with | |
1326 | * the new socket.. | |
1327 | */ | |
4c99aa40 | 1328 | if (nsk != sk) { |
bdeab991 | 1329 | sock_rps_save_rxhash(nsk, skb); |
3d97379a | 1330 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1331 | if (tcp_child_process(sk, nsk, skb)) |
1332 | goto reset; | |
1333 | if (opt_skb) | |
1334 | __kfree_skb(opt_skb); | |
1335 | return 0; | |
1336 | } | |
47482f13 | 1337 | } else |
bdeab991 | 1338 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1339 | |
aa8223c7 | 1340 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1341 | goto reset; |
1da177e4 LT |
1342 | if (opt_skb) |
1343 | goto ipv6_pktoptions; | |
1344 | return 0; | |
1345 | ||
1346 | reset: | |
cfb6eeb4 | 1347 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1348 | discard: |
1349 | if (opt_skb) | |
1350 | __kfree_skb(opt_skb); | |
1351 | kfree_skb(skb); | |
1352 | return 0; | |
1353 | csum_err: | |
6a5dc9e5 | 1354 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1355 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1356 | goto discard; |
1357 | ||
1358 | ||
1359 | ipv6_pktoptions: | |
1360 | /* Do you ask, what is it? | |
1361 | ||
1362 | 1. skb was enqueued by tcp. | |
1363 | 2. skb is added to tail of read queue, rather than out of order. | |
1364 | 3. socket is not in passive state. | |
1365 | 4. Finally, it really contains options, which user wants to receive. | |
1366 | */ | |
1367 | tp = tcp_sk(sk); | |
1368 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1369 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1370 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
870c3151 | 1371 | np->mcast_oif = tcp_v6_iif(opt_skb); |
333fad53 | 1372 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1373 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1374 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1375 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1376 | if (np->repflow) |
1377 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
a224772d | 1378 | if (ipv6_opt_accepted(sk, opt_skb, &TCP_SKB_CB(opt_skb)->header.h6)) { |
1da177e4 LT |
1379 | skb_set_owner_r(opt_skb, sk); |
1380 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1381 | } else { | |
1382 | __kfree_skb(opt_skb); | |
1383 | opt_skb = xchg(&np->pktoptions, NULL); | |
1384 | } | |
1385 | } | |
1386 | ||
800d55f1 | 1387 | kfree_skb(opt_skb); |
1da177e4 LT |
1388 | return 0; |
1389 | } | |
1390 | ||
2dc49d16 ND |
1391 | static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr, |
1392 | const struct tcphdr *th) | |
1393 | { | |
1394 | /* This is tricky: we move IP6CB at its correct location into | |
1395 | * TCP_SKB_CB(). It must be done after xfrm6_policy_check(), because | |
1396 | * _decode_session6() uses IP6CB(). | |
1397 | * barrier() makes sure compiler won't play aliasing games. | |
1398 | */ | |
1399 | memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), | |
1400 | sizeof(struct inet6_skb_parm)); | |
1401 | barrier(); | |
1402 | ||
1403 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); | |
1404 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1405 | skb->len - th->doff*4); | |
1406 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1407 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); | |
1408 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; | |
1409 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); | |
1410 | TCP_SKB_CB(skb)->sacked = 0; | |
1411 | } | |
1412 | ||
e5bbef20 | 1413 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1414 | { |
cf533ea5 | 1415 | const struct tcphdr *th; |
b71d1d42 | 1416 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1417 | struct sock *sk; |
1418 | int ret; | |
a86b1e30 | 1419 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1420 | |
1421 | if (skb->pkt_type != PACKET_HOST) | |
1422 | goto discard_it; | |
1423 | ||
1424 | /* | |
1425 | * Count it even if it's bad. | |
1426 | */ | |
63231bdd | 1427 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1428 | |
1429 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1430 | goto discard_it; | |
1431 | ||
aa8223c7 | 1432 | th = tcp_hdr(skb); |
1da177e4 LT |
1433 | |
1434 | if (th->doff < sizeof(struct tcphdr)/4) | |
1435 | goto bad_packet; | |
1436 | if (!pskb_may_pull(skb, th->doff*4)) | |
1437 | goto discard_it; | |
1438 | ||
e4f45b7f | 1439 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1440 | goto csum_error; |
1da177e4 | 1441 | |
aa8223c7 | 1442 | th = tcp_hdr(skb); |
e802af9c | 1443 | hdr = ipv6_hdr(skb); |
1da177e4 | 1444 | |
870c3151 | 1445 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest, |
2dc49d16 | 1446 | inet6_iif(skb)); |
1da177e4 LT |
1447 | if (!sk) |
1448 | goto no_tcp_socket; | |
1449 | ||
1450 | process: | |
1451 | if (sk->sk_state == TCP_TIME_WAIT) | |
1452 | goto do_time_wait; | |
1453 | ||
e802af9c SH |
1454 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1455 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1456 | goto discard_and_relse; | |
1457 | } | |
1458 | ||
1da177e4 LT |
1459 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1460 | goto discard_and_relse; | |
1461 | ||
2dc49d16 ND |
1462 | tcp_v6_fill_cb(skb, hdr, th); |
1463 | ||
9ea88a15 DP |
1464 | #ifdef CONFIG_TCP_MD5SIG |
1465 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1466 | goto discard_and_relse; | |
1467 | #endif | |
1468 | ||
fda9ef5d | 1469 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1470 | goto discard_and_relse; |
1471 | ||
2c8c56e1 | 1472 | sk_incoming_cpu_update(sk); |
1da177e4 LT |
1473 | skb->dev = NULL; |
1474 | ||
293b9c42 | 1475 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1476 | ret = 0; |
1477 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1478 | if (!tcp_prequeue(sk, skb)) |
1ab1457c | 1479 | ret = tcp_v6_do_rcv(sk, skb); |
da882c1f ED |
1480 | } else if (unlikely(sk_add_backlog(sk, skb, |
1481 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1482 | bh_unlock_sock(sk); |
6cce09f8 | 1483 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1484 | goto discard_and_relse; |
1485 | } | |
1da177e4 LT |
1486 | bh_unlock_sock(sk); |
1487 | ||
1488 | sock_put(sk); | |
1489 | return ret ? -1 : 0; | |
1490 | ||
1491 | no_tcp_socket: | |
1492 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1493 | goto discard_it; | |
1494 | ||
2dc49d16 ND |
1495 | tcp_v6_fill_cb(skb, hdr, th); |
1496 | ||
1da177e4 | 1497 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
6a5dc9e5 ED |
1498 | csum_error: |
1499 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1500 | bad_packet: |
63231bdd | 1501 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1502 | } else { |
cfb6eeb4 | 1503 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1504 | } |
1505 | ||
1506 | discard_it: | |
1da177e4 LT |
1507 | kfree_skb(skb); |
1508 | return 0; | |
1509 | ||
1510 | discard_and_relse: | |
1511 | sock_put(sk); | |
1512 | goto discard_it; | |
1513 | ||
1514 | do_time_wait: | |
1515 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1516 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1517 | goto discard_it; |
1518 | } | |
1519 | ||
2dc49d16 ND |
1520 | tcp_v6_fill_cb(skb, hdr, th); |
1521 | ||
6a5dc9e5 | 1522 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1523 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1524 | goto bad_packet; |
1525 | } | |
1526 | if (tcp_checksum_complete(skb)) { | |
1527 | inet_twsk_put(inet_twsk(sk)); | |
1528 | goto csum_error; | |
1da177e4 LT |
1529 | } |
1530 | ||
9469c7b4 | 1531 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1532 | case TCP_TW_SYN: |
1533 | { | |
1534 | struct sock *sk2; | |
1535 | ||
c346dca1 | 1536 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1537 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1538 | &ipv6_hdr(skb)->daddr, |
870c3151 | 1539 | ntohs(th->dest), tcp_v6_iif(skb)); |
1da177e4 | 1540 | if (sk2 != NULL) { |
295ff7ed ACM |
1541 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1542 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1543 | inet_twsk_put(tw); | |
1da177e4 LT |
1544 | sk = sk2; |
1545 | goto process; | |
1546 | } | |
1547 | /* Fall through to ACK */ | |
1548 | } | |
1549 | case TCP_TW_ACK: | |
1550 | tcp_v6_timewait_ack(sk, skb); | |
1551 | break; | |
1552 | case TCP_TW_RST: | |
1553 | goto no_tcp_socket; | |
4aa956d8 WY |
1554 | case TCP_TW_SUCCESS: |
1555 | ; | |
1da177e4 LT |
1556 | } |
1557 | goto discard_it; | |
1558 | } | |
1559 | ||
c7109986 ED |
1560 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1561 | { | |
1562 | const struct ipv6hdr *hdr; | |
1563 | const struct tcphdr *th; | |
1564 | struct sock *sk; | |
1565 | ||
1566 | if (skb->pkt_type != PACKET_HOST) | |
1567 | return; | |
1568 | ||
1569 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1570 | return; | |
1571 | ||
1572 | hdr = ipv6_hdr(skb); | |
1573 | th = tcp_hdr(skb); | |
1574 | ||
1575 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1576 | return; | |
1577 | ||
870c3151 | 1578 | /* Note : We use inet6_iif() here, not tcp_v6_iif() */ |
c7109986 ED |
1579 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
1580 | &hdr->saddr, th->source, | |
1581 | &hdr->daddr, ntohs(th->dest), | |
1582 | inet6_iif(skb)); | |
1583 | if (sk) { | |
1584 | skb->sk = sk; | |
1585 | skb->destructor = sock_edemux; | |
f7e4eb03 | 1586 | if (sk_fullsock(sk)) { |
c7109986 | 1587 | struct dst_entry *dst = sk->sk_rx_dst; |
f3f12135 | 1588 | |
c7109986 | 1589 | if (dst) |
5d299f3d | 1590 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1591 | if (dst && |
f3f12135 | 1592 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1593 | skb_dst_set_noref(skb, dst); |
1594 | } | |
1595 | } | |
1596 | } | |
1597 | ||
ccb7c410 DM |
1598 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1599 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1600 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1601 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1602 | }; |
1603 | ||
3b401a81 | 1604 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1605 | .queue_xmit = inet6_csk_xmit, |
1606 | .send_check = tcp_v6_send_check, | |
1607 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1608 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1609 | .conn_request = tcp_v6_conn_request, |
1610 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1611 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1612 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1613 | .setsockopt = ipv6_setsockopt, |
1614 | .getsockopt = ipv6_getsockopt, | |
1615 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1616 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1617 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1618 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1619 | .compat_setsockopt = compat_ipv6_setsockopt, |
1620 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1621 | #endif |
4fab9071 | 1622 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1623 | }; |
1624 | ||
cfb6eeb4 | 1625 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1626 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1627 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1628 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1629 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1630 | }; |
a928630a | 1631 | #endif |
cfb6eeb4 | 1632 | |
1da177e4 LT |
1633 | /* |
1634 | * TCP over IPv4 via INET6 API | |
1635 | */ | |
3b401a81 | 1636 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1637 | .queue_xmit = ip_queue_xmit, |
1638 | .send_check = tcp_v4_send_check, | |
1639 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1640 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1641 | .conn_request = tcp_v6_conn_request, |
1642 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1643 | .net_header_len = sizeof(struct iphdr), |
1644 | .setsockopt = ipv6_setsockopt, | |
1645 | .getsockopt = ipv6_getsockopt, | |
1646 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1647 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1648 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1649 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1650 | .compat_setsockopt = compat_ipv6_setsockopt, |
1651 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1652 | #endif |
4fab9071 | 1653 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1654 | }; |
1655 | ||
cfb6eeb4 | 1656 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1657 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1658 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1659 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1660 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1661 | }; |
a928630a | 1662 | #endif |
cfb6eeb4 | 1663 | |
1da177e4 LT |
1664 | /* NOTE: A lot of things set to zero explicitly by call to |
1665 | * sk_alloc() so need not be done here. | |
1666 | */ | |
1667 | static int tcp_v6_init_sock(struct sock *sk) | |
1668 | { | |
6687e988 | 1669 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1670 | |
900f65d3 | 1671 | tcp_init_sock(sk); |
1da177e4 | 1672 | |
8292a17a | 1673 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1674 | |
cfb6eeb4 | 1675 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1676 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1677 | #endif |
1678 | ||
1da177e4 LT |
1679 | return 0; |
1680 | } | |
1681 | ||
7d06b2e0 | 1682 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1683 | { |
1da177e4 | 1684 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1685 | inet6_destroy_sock(sk); |
1da177e4 LT |
1686 | } |
1687 | ||
952a10be | 1688 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1689 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1690 | static void get_openreq6(struct seq_file *seq, |
d4f06873 | 1691 | struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1692 | { |
1da177e4 | 1693 | int ttd = req->expires - jiffies; |
634fb979 ED |
1694 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1695 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1696 | |
1697 | if (ttd < 0) | |
1698 | ttd = 0; | |
1699 | ||
1da177e4 LT |
1700 | seq_printf(seq, |
1701 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1702 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1703 | i, |
1704 | src->s6_addr32[0], src->s6_addr32[1], | |
1705 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1706 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1707 | dest->s6_addr32[0], dest->s6_addr32[1], |
1708 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1709 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1710 | TCP_SYN_RECV, |
4c99aa40 | 1711 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1712 | 1, /* timers active (only the expire timer) */ |
1713 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1714 | req->num_timeout, |
a7cb5a49 | 1715 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1716 | 0, /* non standard timer */ |
1da177e4 LT |
1717 | 0, /* open_requests have no inode */ |
1718 | 0, req); | |
1719 | } | |
1720 | ||
1721 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1722 | { | |
b71d1d42 | 1723 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1724 | __u16 destp, srcp; |
1725 | int timer_active; | |
1726 | unsigned long timer_expires; | |
cf533ea5 ED |
1727 | const struct inet_sock *inet = inet_sk(sp); |
1728 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1729 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1730 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1731 | |
efe4208f ED |
1732 | dest = &sp->sk_v6_daddr; |
1733 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1734 | destp = ntohs(inet->inet_dport); |
1735 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1736 | |
1737 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1738 | timer_active = 1; |
463c84b9 ACM |
1739 | timer_expires = icsk->icsk_timeout; |
1740 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1741 | timer_active = 4; |
463c84b9 | 1742 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1743 | } else if (timer_pending(&sp->sk_timer)) { |
1744 | timer_active = 2; | |
1745 | timer_expires = sp->sk_timer.expires; | |
1746 | } else { | |
1747 | timer_active = 0; | |
1748 | timer_expires = jiffies; | |
1749 | } | |
1750 | ||
1751 | seq_printf(seq, | |
1752 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1753 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1754 | i, |
1755 | src->s6_addr32[0], src->s6_addr32[1], | |
1756 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1757 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1758 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1759 | sp->sk_state, |
47da8ee6 SS |
1760 | tp->write_seq-tp->snd_una, |
1761 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1762 | timer_active, |
a399a805 | 1763 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1764 | icsk->icsk_retransmits, |
a7cb5a49 | 1765 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1766 | icsk->icsk_probes_out, |
1da177e4 LT |
1767 | sock_i_ino(sp), |
1768 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1769 | jiffies_to_clock_t(icsk->icsk_rto), |
1770 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1771 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1772 | tp->snd_cwnd, |
0a672f74 YC |
1773 | sp->sk_state == TCP_LISTEN ? |
1774 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1775 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1776 | ); |
1777 | } | |
1778 | ||
1ab1457c | 1779 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1780 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1781 | { |
b71d1d42 | 1782 | const struct in6_addr *dest, *src; |
1da177e4 | 1783 | __u16 destp, srcp; |
96f817fe | 1784 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1785 | |
efe4208f ED |
1786 | dest = &tw->tw_v6_daddr; |
1787 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1788 | destp = ntohs(tw->tw_dport); |
1789 | srcp = ntohs(tw->tw_sport); | |
1790 | ||
1791 | seq_printf(seq, | |
1792 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1793 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1794 | i, |
1795 | src->s6_addr32[0], src->s6_addr32[1], | |
1796 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1797 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1798 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1799 | tw->tw_substate, 0, 0, | |
a399a805 | 1800 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1801 | atomic_read(&tw->tw_refcnt), tw); |
1802 | } | |
1803 | ||
1da177e4 LT |
1804 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1805 | { | |
1806 | struct tcp_iter_state *st; | |
05dbc7b5 | 1807 | struct sock *sk = v; |
1da177e4 LT |
1808 | |
1809 | if (v == SEQ_START_TOKEN) { | |
1810 | seq_puts(seq, | |
1811 | " sl " | |
1812 | "local_address " | |
1813 | "remote_address " | |
1814 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1815 | " uid timeout inode\n"); | |
1816 | goto out; | |
1817 | } | |
1818 | st = seq->private; | |
1819 | ||
1820 | switch (st->state) { | |
1821 | case TCP_SEQ_STATE_LISTENING: | |
1822 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1823 | if (sk->sk_state == TCP_TIME_WAIT) |
1824 | get_timewait6_sock(seq, v, st->num); | |
1825 | else | |
1826 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1827 | break; |
1828 | case TCP_SEQ_STATE_OPENREQ: | |
d4f06873 | 1829 | get_openreq6(seq, v, st->num, st->uid); |
1da177e4 | 1830 | break; |
1da177e4 LT |
1831 | } |
1832 | out: | |
1833 | return 0; | |
1834 | } | |
1835 | ||
73cb88ec AV |
1836 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1837 | .owner = THIS_MODULE, | |
1838 | .open = tcp_seq_open, | |
1839 | .read = seq_read, | |
1840 | .llseek = seq_lseek, | |
1841 | .release = seq_release_net | |
1842 | }; | |
1843 | ||
1da177e4 | 1844 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1845 | .name = "tcp6", |
1846 | .family = AF_INET6, | |
73cb88ec | 1847 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1848 | .seq_ops = { |
1849 | .show = tcp6_seq_show, | |
1850 | }, | |
1da177e4 LT |
1851 | }; |
1852 | ||
2c8c1e72 | 1853 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1854 | { |
6f8b13bc | 1855 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1856 | } |
1857 | ||
6f8b13bc | 1858 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1859 | { |
6f8b13bc | 1860 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1861 | } |
1862 | #endif | |
1863 | ||
f77d6021 ED |
1864 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1865 | { | |
1866 | struct inet_sock *inet = inet_sk(sk); | |
1867 | ||
1868 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1869 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1870 | ||
1871 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1872 | memset(&inet->pinet6 + 1, 0, size); | |
1873 | } | |
1874 | ||
1da177e4 LT |
1875 | struct proto tcpv6_prot = { |
1876 | .name = "TCPv6", | |
1877 | .owner = THIS_MODULE, | |
1878 | .close = tcp_close, | |
1879 | .connect = tcp_v6_connect, | |
1880 | .disconnect = tcp_disconnect, | |
463c84b9 | 1881 | .accept = inet_csk_accept, |
1da177e4 LT |
1882 | .ioctl = tcp_ioctl, |
1883 | .init = tcp_v6_init_sock, | |
1884 | .destroy = tcp_v6_destroy_sock, | |
1885 | .shutdown = tcp_shutdown, | |
1886 | .setsockopt = tcp_setsockopt, | |
1887 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1888 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1889 | .sendmsg = tcp_sendmsg, |
1890 | .sendpage = tcp_sendpage, | |
1da177e4 | 1891 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1892 | .release_cb = tcp_release_cb, |
1da177e4 | 1893 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1894 | .unhash = inet_unhash, |
1895 | .get_port = inet_csk_get_port, | |
1da177e4 | 1896 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1897 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1898 | .sockets_allocated = &tcp_sockets_allocated, |
1899 | .memory_allocated = &tcp_memory_allocated, | |
1900 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1901 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1902 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1903 | .sysctl_wmem = sysctl_tcp_wmem, |
1904 | .sysctl_rmem = sysctl_tcp_rmem, | |
1905 | .max_header = MAX_TCP_HEADER, | |
1906 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1907 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1908 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1909 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1910 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1911 | .no_autobind = true, |
543d9cfe ACM |
1912 | #ifdef CONFIG_COMPAT |
1913 | .compat_setsockopt = compat_tcp_setsockopt, | |
1914 | .compat_getsockopt = compat_tcp_getsockopt, | |
1915 | #endif | |
c255a458 | 1916 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1917 | .proto_cgroup = tcp_proto_cgroup, |
1918 | #endif | |
f77d6021 | 1919 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1920 | }; |
1921 | ||
41135cc8 | 1922 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1923 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1924 | .handler = tcp_v6_rcv, |
1925 | .err_handler = tcp_v6_err, | |
1926 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1927 | }; | |
1928 | ||
1da177e4 LT |
1929 | static struct inet_protosw tcpv6_protosw = { |
1930 | .type = SOCK_STREAM, | |
1931 | .protocol = IPPROTO_TCP, | |
1932 | .prot = &tcpv6_prot, | |
1933 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1934 | .flags = INET_PROTOSW_PERMANENT | |
1935 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1936 | }; |
1937 | ||
2c8c1e72 | 1938 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1939 | { |
5677242f DL |
1940 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1941 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1942 | } |
1943 | ||
2c8c1e72 | 1944 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1945 | { |
5677242f | 1946 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1947 | } |
1948 | ||
2c8c1e72 | 1949 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1950 | { |
1951 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1952 | } |
1953 | ||
1954 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1955 | .init = tcpv6_net_init, |
1956 | .exit = tcpv6_net_exit, | |
1957 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1958 | }; |
1959 | ||
7f4e4868 | 1960 | int __init tcpv6_init(void) |
1da177e4 | 1961 | { |
7f4e4868 DL |
1962 | int ret; |
1963 | ||
3336288a VY |
1964 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1965 | if (ret) | |
c6b641a4 | 1966 | goto out; |
3336288a | 1967 | |
1da177e4 | 1968 | /* register inet6 protocol */ |
7f4e4868 DL |
1969 | ret = inet6_register_protosw(&tcpv6_protosw); |
1970 | if (ret) | |
1971 | goto out_tcpv6_protocol; | |
1972 | ||
93ec926b | 1973 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1974 | if (ret) |
1975 | goto out_tcpv6_protosw; | |
1976 | out: | |
1977 | return ret; | |
ae0f7d5f | 1978 | |
7f4e4868 DL |
1979 | out_tcpv6_protosw: |
1980 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1981 | out_tcpv6_protocol: |
1982 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1983 | goto out; |
1984 | } | |
1985 | ||
09f7709f | 1986 | void tcpv6_exit(void) |
7f4e4868 | 1987 | { |
93ec926b | 1988 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1989 | inet6_unregister_protosw(&tcpv6_protosw); |
1990 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1991 | } |