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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
6e5714ea | 64 | #include <net/secure_seq.h> |
d1a4c0b3 | 65 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 66 | #include <net/busy_poll.h> |
1da177e4 | 67 | |
1da177e4 LT |
68 | #include <linux/proc_fs.h> |
69 | #include <linux/seq_file.h> | |
70 | ||
cfb6eeb4 YH |
71 | #include <linux/crypto.h> |
72 | #include <linux/scatterlist.h> | |
73 | ||
cfb6eeb4 | 74 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
75 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
76 | struct request_sock *req); | |
1da177e4 LT |
77 | |
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 79 | |
3b401a81 SH |
80 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 82 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
85 | #else |
86 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 87 | const struct in6_addr *addr) |
9501f972 YH |
88 | { |
89 | return NULL; | |
90 | } | |
a928630a | 91 | #endif |
1da177e4 | 92 | |
fae6ef87 NC |
93 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
94 | { | |
95 | struct dst_entry *dst = skb_dst(skb); | |
96 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
97 | ||
98 | dst_hold(dst); | |
99 | sk->sk_rx_dst = dst; | |
100 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
101 | if (rt->rt6i_node) | |
102 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
103 | } | |
104 | ||
1da177e4 LT |
105 | static void tcp_v6_hash(struct sock *sk) |
106 | { | |
107 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 108 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
109 | tcp_prot.hash(sk); |
110 | return; | |
111 | } | |
112 | local_bh_disable(); | |
9327f705 | 113 | __inet6_hash(sk, NULL); |
1da177e4 LT |
114 | local_bh_enable(); |
115 | } | |
116 | } | |
117 | ||
cf533ea5 | 118 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 119 | { |
0660e03f ACM |
120 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
121 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
122 | tcp_hdr(skb)->dest, |
123 | tcp_hdr(skb)->source); | |
1da177e4 LT |
124 | } |
125 | ||
1ab1457c | 126 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
127 | int addr_len) |
128 | { | |
129 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 130 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 131 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
132 | struct ipv6_pinfo *np = inet6_sk(sk); |
133 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 134 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 135 | struct rt6_info *rt; |
4c9483b2 | 136 | struct flowi6 fl6; |
1da177e4 LT |
137 | struct dst_entry *dst; |
138 | int addr_type; | |
139 | int err; | |
140 | ||
1ab1457c | 141 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
142 | return -EINVAL; |
143 | ||
1ab1457c | 144 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 145 | return -EAFNOSUPPORT; |
1da177e4 | 146 | |
4c9483b2 | 147 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
148 | |
149 | if (np->sndflow) { | |
4c9483b2 DM |
150 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
151 | IP6_ECN_flow_init(fl6.flowlabel); | |
152 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 153 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 154 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
155 | if (flowlabel == NULL) |
156 | return -EINVAL; | |
1da177e4 LT |
157 | fl6_sock_release(flowlabel); |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
1ab1457c YH |
162 | * connect() to INADDR_ANY means loopback (BSD'ism). |
163 | */ | |
164 | ||
4c99aa40 | 165 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 166 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
169 | ||
4c99aa40 | 170 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
171 | return -ENETUNREACH; |
172 | ||
173 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
174 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
175 | usin->sin6_scope_id) { | |
176 | /* If interface is set while binding, indices | |
177 | * must coincide. | |
178 | */ | |
179 | if (sk->sk_bound_dev_if && | |
180 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
181 | return -EINVAL; | |
182 | ||
183 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
184 | } | |
185 | ||
186 | /* Connect to link-local address requires an interface */ | |
187 | if (!sk->sk_bound_dev_if) | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 192 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
193 | tp->rx_opt.ts_recent = 0; |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
efe4208f | 198 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 199 | np->flow_label = fl6.flowlabel; |
1da177e4 | 200 | |
b73c3d0e TH |
201 | ip6_set_txhash(sk); |
202 | ||
1da177e4 LT |
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 | ||
2b916477 | 298 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 299 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 300 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
301 | inet->inet_sport, |
302 | inet->inet_dport); | |
1da177e4 LT |
303 | |
304 | err = tcp_connect(sk); | |
305 | if (err) | |
306 | goto late_failure; | |
307 | ||
308 | return 0; | |
309 | ||
310 | late_failure: | |
311 | tcp_set_state(sk, TCP_CLOSE); | |
312 | __sk_dst_reset(sk); | |
313 | failure: | |
c720c7e8 | 314 | inet->inet_dport = 0; |
1da177e4 LT |
315 | sk->sk_route_caps = 0; |
316 | return err; | |
317 | } | |
318 | ||
563d34d0 ED |
319 | static void tcp_v6_mtu_reduced(struct sock *sk) |
320 | { | |
321 | struct dst_entry *dst; | |
322 | ||
323 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
324 | return; | |
325 | ||
326 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
327 | if (!dst) | |
328 | return; | |
329 | ||
330 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
331 | tcp_sync_mss(sk, dst_mtu(dst)); | |
332 | tcp_simple_retransmit(sk); | |
333 | } | |
334 | } | |
335 | ||
1da177e4 | 336 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 337 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 338 | { |
4c99aa40 | 339 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 340 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
341 | struct ipv6_pinfo *np; |
342 | struct sock *sk; | |
343 | int err; | |
1ab1457c | 344 | struct tcp_sock *tp; |
0a672f74 YC |
345 | struct request_sock *fastopen; |
346 | __u32 seq, snd_una; | |
ca12a1a4 | 347 | struct net *net = dev_net(skb->dev); |
1da177e4 | 348 | |
ca12a1a4 | 349 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 350 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
351 | |
352 | if (sk == NULL) { | |
e41b5368 DL |
353 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
354 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
355 | return; |
356 | } | |
357 | ||
358 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 359 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
360 | return; |
361 | } | |
362 | ||
363 | bh_lock_sock(sk); | |
563d34d0 | 364 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 365 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
366 | |
367 | if (sk->sk_state == TCP_CLOSE) | |
368 | goto out; | |
369 | ||
e802af9c SH |
370 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
371 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
372 | goto out; | |
373 | } | |
374 | ||
1da177e4 | 375 | tp = tcp_sk(sk); |
1ab1457c | 376 | seq = ntohl(th->seq); |
0a672f74 YC |
377 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
378 | fastopen = tp->fastopen_rsk; | |
379 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 380 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 381 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 382 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
383 | goto out; |
384 | } | |
385 | ||
386 | np = inet6_sk(sk); | |
387 | ||
ec18d9a2 DM |
388 | if (type == NDISC_REDIRECT) { |
389 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
390 | ||
1ed5c48f | 391 | if (dst) |
6700c270 | 392 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 393 | goto out; |
ec18d9a2 DM |
394 | } |
395 | ||
1da177e4 | 396 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
397 | /* We are not interested in TCP_LISTEN and open_requests |
398 | * (SYN-ACKs send out by Linux are always <576bytes so | |
399 | * they should go through unfragmented). | |
400 | */ | |
401 | if (sk->sk_state == TCP_LISTEN) | |
402 | goto out; | |
403 | ||
93b36cf3 HFS |
404 | if (!ip6_sk_accept_pmtu(sk)) |
405 | goto out; | |
406 | ||
563d34d0 ED |
407 | tp->mtu_info = ntohl(info); |
408 | if (!sock_owned_by_user(sk)) | |
409 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
410 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
411 | &tp->tsq_flags)) | |
412 | sock_hold(sk); | |
1da177e4 LT |
413 | goto out; |
414 | } | |
415 | ||
416 | icmpv6_err_convert(type, code, &err); | |
417 | ||
60236fdd | 418 | /* Might be for an request_sock */ |
1da177e4 | 419 | switch (sk->sk_state) { |
60236fdd | 420 | struct request_sock *req, **prev; |
1da177e4 LT |
421 | case TCP_LISTEN: |
422 | if (sock_owned_by_user(sk)) | |
423 | goto out; | |
424 | ||
8129765a ACM |
425 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
426 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
427 | if (!req) |
428 | goto out; | |
429 | ||
430 | /* ICMPs are not backlogged, hence we cannot get | |
431 | * an established socket here. | |
432 | */ | |
547b792c | 433 | WARN_ON(req->sk != NULL); |
1da177e4 | 434 | |
2e6599cb | 435 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 436 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
437 | goto out; |
438 | } | |
439 | ||
463c84b9 | 440 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 441 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
442 | goto out; |
443 | ||
444 | case TCP_SYN_SENT: | |
0a672f74 YC |
445 | case TCP_SYN_RECV: |
446 | /* Only in fast or simultaneous open. If a fast open socket is | |
447 | * is already accepted it is treated as a connected one below. | |
448 | */ | |
449 | if (fastopen && fastopen->sk == NULL) | |
450 | break; | |
451 | ||
1da177e4 | 452 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
453 | sk->sk_err = err; |
454 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
455 | ||
456 | tcp_done(sk); | |
457 | } else | |
458 | sk->sk_err_soft = err; | |
459 | goto out; | |
460 | } | |
461 | ||
462 | if (!sock_owned_by_user(sk) && np->recverr) { | |
463 | sk->sk_err = err; | |
464 | sk->sk_error_report(sk); | |
465 | } else | |
466 | sk->sk_err_soft = err; | |
467 | ||
468 | out: | |
469 | bh_unlock_sock(sk); | |
470 | sock_put(sk); | |
471 | } | |
472 | ||
473 | ||
9f10d3f6 | 474 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 475 | struct flowi *fl, |
3840a06e | 476 | struct request_sock *req, |
3a19ce0e DL |
477 | u16 queue_mapping, |
478 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 479 | { |
634fb979 | 480 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 481 | struct ipv6_pinfo *np = inet6_sk(sk); |
d6274bd8 | 482 | struct flowi6 *fl6 = &fl->u.ip6; |
4c99aa40 | 483 | struct sk_buff *skb; |
9494218f | 484 | int err = -ENOMEM; |
1da177e4 | 485 | |
9f10d3f6 NC |
486 | /* First, grab a route. */ |
487 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 488 | goto done; |
9494218f | 489 | |
3a19ce0e | 490 | skb = tcp_make_synack(sk, dst, req, foc); |
9494218f | 491 | |
1da177e4 | 492 | if (skb) { |
634fb979 ED |
493 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
494 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 495 | |
634fb979 | 496 | fl6->daddr = ireq->ir_v6_rmt_addr; |
df3687ff FF |
497 | if (np->repflow && (ireq->pktopts != NULL)) |
498 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
499 | ||
fff32699 | 500 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 501 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 502 | err = net_xmit_eval(err); |
1da177e4 LT |
503 | } |
504 | ||
505 | done: | |
1da177e4 LT |
506 | return err; |
507 | } | |
508 | ||
72659ecc | 509 | |
60236fdd | 510 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 511 | { |
634fb979 | 512 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
513 | } |
514 | ||
cfb6eeb4 YH |
515 | #ifdef CONFIG_TCP_MD5SIG |
516 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 517 | const struct in6_addr *addr) |
cfb6eeb4 | 518 | { |
a915da9b | 519 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
520 | } |
521 | ||
522 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
523 | struct sock *addr_sk) | |
524 | { | |
efe4208f | 525 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
526 | } |
527 | ||
528 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
529 | struct request_sock *req) | |
530 | { | |
634fb979 | 531 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
532 | } |
533 | ||
4aa956d8 WY |
534 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
535 | int optlen) | |
cfb6eeb4 YH |
536 | { |
537 | struct tcp_md5sig cmd; | |
538 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
539 | |
540 | if (optlen < sizeof(cmd)) | |
541 | return -EINVAL; | |
542 | ||
543 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
544 | return -EFAULT; | |
545 | ||
546 | if (sin6->sin6_family != AF_INET6) | |
547 | return -EINVAL; | |
548 | ||
549 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 550 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
551 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
552 | AF_INET); | |
553 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
554 | AF_INET6); | |
cfb6eeb4 YH |
555 | } |
556 | ||
557 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
558 | return -EINVAL; | |
559 | ||
a915da9b ED |
560 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
561 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
562 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 563 | |
a915da9b ED |
564 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
565 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
566 | } |
567 | ||
49a72dfb | 568 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
569 | const struct in6_addr *daddr, |
570 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 571 | { |
cfb6eeb4 | 572 | struct tcp6_pseudohdr *bp; |
49a72dfb | 573 | struct scatterlist sg; |
8d26d76d | 574 | |
cfb6eeb4 | 575 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 576 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
577 | bp->saddr = *saddr; |
578 | bp->daddr = *daddr; | |
49a72dfb | 579 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 580 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 581 | |
49a72dfb AL |
582 | sg_init_one(&sg, bp, sizeof(*bp)); |
583 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
584 | } | |
c7da57a1 | 585 | |
49a72dfb | 586 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 587 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 588 | const struct tcphdr *th) |
49a72dfb AL |
589 | { |
590 | struct tcp_md5sig_pool *hp; | |
591 | struct hash_desc *desc; | |
592 | ||
593 | hp = tcp_get_md5sig_pool(); | |
594 | if (!hp) | |
595 | goto clear_hash_noput; | |
596 | desc = &hp->md5_desc; | |
597 | ||
598 | if (crypto_hash_init(desc)) | |
599 | goto clear_hash; | |
600 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
601 | goto clear_hash; | |
602 | if (tcp_md5_hash_header(hp, th)) | |
603 | goto clear_hash; | |
604 | if (tcp_md5_hash_key(hp, key)) | |
605 | goto clear_hash; | |
606 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 607 | goto clear_hash; |
cfb6eeb4 | 608 | |
cfb6eeb4 | 609 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 610 | return 0; |
49a72dfb | 611 | |
cfb6eeb4 YH |
612 | clear_hash: |
613 | tcp_put_md5sig_pool(); | |
614 | clear_hash_noput: | |
615 | memset(md5_hash, 0, 16); | |
49a72dfb | 616 | return 1; |
cfb6eeb4 YH |
617 | } |
618 | ||
49a72dfb | 619 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
620 | const struct sock *sk, |
621 | const struct request_sock *req, | |
622 | const struct sk_buff *skb) | |
cfb6eeb4 | 623 | { |
b71d1d42 | 624 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
625 | struct tcp_md5sig_pool *hp; |
626 | struct hash_desc *desc; | |
318cf7aa | 627 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
628 | |
629 | if (sk) { | |
630 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 631 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 632 | } else if (req) { |
634fb979 ED |
633 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
634 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; | |
49a72dfb | 635 | } else { |
b71d1d42 | 636 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
637 | saddr = &ip6h->saddr; |
638 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 639 | } |
49a72dfb AL |
640 | |
641 | hp = tcp_get_md5sig_pool(); | |
642 | if (!hp) | |
643 | goto clear_hash_noput; | |
644 | desc = &hp->md5_desc; | |
645 | ||
646 | if (crypto_hash_init(desc)) | |
647 | goto clear_hash; | |
648 | ||
649 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
650 | goto clear_hash; | |
651 | if (tcp_md5_hash_header(hp, th)) | |
652 | goto clear_hash; | |
653 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
654 | goto clear_hash; | |
655 | if (tcp_md5_hash_key(hp, key)) | |
656 | goto clear_hash; | |
657 | if (crypto_hash_final(desc, md5_hash)) | |
658 | goto clear_hash; | |
659 | ||
660 | tcp_put_md5sig_pool(); | |
661 | return 0; | |
662 | ||
663 | clear_hash: | |
664 | tcp_put_md5sig_pool(); | |
665 | clear_hash_noput: | |
666 | memset(md5_hash, 0, 16); | |
667 | return 1; | |
cfb6eeb4 YH |
668 | } |
669 | ||
9ea88a15 DP |
670 | static int __tcp_v6_inbound_md5_hash(struct sock *sk, |
671 | const struct sk_buff *skb) | |
cfb6eeb4 | 672 | { |
cf533ea5 | 673 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 674 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 675 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 676 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 677 | int genhash; |
cfb6eeb4 YH |
678 | u8 newhash[16]; |
679 | ||
680 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 681 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 682 | |
785957d3 DM |
683 | /* We've parsed the options - do we have a hash? */ |
684 | if (!hash_expected && !hash_location) | |
685 | return 0; | |
686 | ||
687 | if (hash_expected && !hash_location) { | |
688 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
689 | return 1; |
690 | } | |
691 | ||
785957d3 DM |
692 | if (!hash_expected && hash_location) { |
693 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
694 | return 1; |
695 | } | |
696 | ||
697 | /* check the signature */ | |
49a72dfb AL |
698 | genhash = tcp_v6_md5_hash_skb(newhash, |
699 | hash_expected, | |
700 | NULL, NULL, skb); | |
701 | ||
cfb6eeb4 | 702 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
703 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
704 | genhash ? "failed" : "mismatch", | |
705 | &ip6h->saddr, ntohs(th->source), | |
706 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
707 | return 1; |
708 | } | |
709 | return 0; | |
710 | } | |
9ea88a15 DP |
711 | |
712 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) | |
713 | { | |
714 | int ret; | |
715 | ||
716 | rcu_read_lock(); | |
717 | ret = __tcp_v6_inbound_md5_hash(sk, skb); | |
718 | rcu_read_unlock(); | |
719 | ||
720 | return ret; | |
721 | } | |
722 | ||
cfb6eeb4 YH |
723 | #endif |
724 | ||
16bea70a OP |
725 | static void tcp_v6_init_req(struct request_sock *req, struct sock *sk, |
726 | struct sk_buff *skb) | |
727 | { | |
728 | struct inet_request_sock *ireq = inet_rsk(req); | |
729 | struct ipv6_pinfo *np = inet6_sk(sk); | |
730 | ||
731 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
732 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
733 | ||
734 | ireq->ir_iif = sk->sk_bound_dev_if; | |
735 | ||
736 | /* So that link locals have meaning */ | |
737 | if (!sk->sk_bound_dev_if && | |
738 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
739 | ireq->ir_iif = inet6_iif(skb); | |
740 | ||
741 | if (!TCP_SKB_CB(skb)->when && | |
742 | (ipv6_opt_accepted(sk, skb) || np->rxopt.bits.rxinfo || | |
743 | np->rxopt.bits.rxoinfo || np->rxopt.bits.rxhlim || | |
744 | np->rxopt.bits.rxohlim || np->repflow)) { | |
745 | atomic_inc(&skb->users); | |
746 | ireq->pktopts = skb; | |
747 | } | |
748 | } | |
749 | ||
d94e0417 OP |
750 | static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl, |
751 | const struct request_sock *req, | |
752 | bool *strict) | |
753 | { | |
754 | if (strict) | |
755 | *strict = true; | |
756 | return inet6_csk_route_req(sk, &fl->u.ip6, req); | |
757 | } | |
758 | ||
c6aefafb | 759 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 760 | .family = AF_INET6, |
2e6599cb | 761 | .obj_size = sizeof(struct tcp6_request_sock), |
5db92c99 | 762 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
763 | .send_ack = tcp_v6_reqsk_send_ack, |
764 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 765 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 766 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
767 | }; |
768 | ||
b2e4b3de | 769 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
2aec4a29 OP |
770 | .mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - |
771 | sizeof(struct ipv6hdr), | |
16bea70a | 772 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 773 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 774 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
b6332e6c | 775 | #endif |
16bea70a | 776 | .init_req = tcp_v6_init_req, |
fb7b37a7 OP |
777 | #ifdef CONFIG_SYN_COOKIES |
778 | .cookie_init_seq = cookie_v6_init_sequence, | |
779 | #endif | |
d94e0417 | 780 | .route_req = tcp_v6_route_req, |
936b8bdb | 781 | .init_seq = tcp_v6_init_sequence, |
d6274bd8 | 782 | .send_synack = tcp_v6_send_synack, |
695da14e | 783 | .queue_hash_add = inet6_csk_reqsk_queue_hash_add, |
16bea70a | 784 | }; |
cfb6eeb4 | 785 | |
626e264d | 786 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
9c76a114 | 787 | u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
788 | struct tcp_md5sig_key *key, int rst, u8 tclass, |
789 | u32 label) | |
1da177e4 | 790 | { |
cf533ea5 ED |
791 | const struct tcphdr *th = tcp_hdr(skb); |
792 | struct tcphdr *t1; | |
1da177e4 | 793 | struct sk_buff *buff; |
4c9483b2 | 794 | struct flowi6 fl6; |
adf30907 | 795 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 796 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 797 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 798 | struct dst_entry *dst; |
81ada62d | 799 | __be32 *topt; |
1da177e4 | 800 | |
ee684b6f | 801 | if (tsecr) |
626e264d | 802 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 803 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
804 | if (key) |
805 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
806 | #endif | |
807 | ||
cfb6eeb4 | 808 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 809 | GFP_ATOMIC); |
1ab1457c YH |
810 | if (buff == NULL) |
811 | return; | |
1da177e4 | 812 | |
cfb6eeb4 | 813 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 814 | |
cfb6eeb4 | 815 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 816 | skb_reset_transport_header(buff); |
1da177e4 LT |
817 | |
818 | /* Swap the send and the receive. */ | |
819 | memset(t1, 0, sizeof(*t1)); | |
820 | t1->dest = th->source; | |
821 | t1->source = th->dest; | |
cfb6eeb4 | 822 | t1->doff = tot_len / 4; |
626e264d IJ |
823 | t1->seq = htonl(seq); |
824 | t1->ack_seq = htonl(ack); | |
825 | t1->ack = !rst || !th->ack; | |
826 | t1->rst = rst; | |
827 | t1->window = htons(win); | |
1da177e4 | 828 | |
81ada62d IJ |
829 | topt = (__be32 *)(t1 + 1); |
830 | ||
ee684b6f | 831 | if (tsecr) { |
626e264d IJ |
832 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
833 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
834 | *topt++ = htonl(tsval); |
835 | *topt++ = htonl(tsecr); | |
626e264d IJ |
836 | } |
837 | ||
cfb6eeb4 YH |
838 | #ifdef CONFIG_TCP_MD5SIG |
839 | if (key) { | |
81ada62d IJ |
840 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
841 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
842 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
843 | &ipv6_hdr(skb)->saddr, |
844 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
845 | } |
846 | #endif | |
847 | ||
4c9483b2 | 848 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
849 | fl6.daddr = ipv6_hdr(skb)->saddr; |
850 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 851 | fl6.flowlabel = label; |
1da177e4 | 852 | |
e5700aff DM |
853 | buff->ip_summed = CHECKSUM_PARTIAL; |
854 | buff->csum = 0; | |
855 | ||
4c9483b2 | 856 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 857 | |
4c9483b2 | 858 | fl6.flowi6_proto = IPPROTO_TCP; |
a36dbdb2 | 859 | if (rt6_need_strict(&fl6.daddr) && !oif) |
4c675258 | 860 | fl6.flowi6_oif = inet6_iif(skb); |
9c76a114 WY |
861 | else |
862 | fl6.flowi6_oif = oif; | |
e110861f | 863 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
864 | fl6.fl6_dport = t1->dest; |
865 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 866 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 867 | |
c20121ae DL |
868 | /* Pass a socket to ip6_dst_lookup either it is for RST |
869 | * Underlying function will use this to retrieve the network | |
870 | * namespace | |
871 | */ | |
0e0d44ab | 872 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
873 | if (!IS_ERR(dst)) { |
874 | skb_dst_set(buff, dst); | |
b903d324 | 875 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
876 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
877 | if (rst) | |
878 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
879 | return; | |
1da177e4 LT |
880 | } |
881 | ||
882 | kfree_skb(buff); | |
883 | } | |
884 | ||
626e264d | 885 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 886 | { |
cf533ea5 | 887 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 888 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 889 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
890 | #ifdef CONFIG_TCP_MD5SIG |
891 | const __u8 *hash_location = NULL; | |
892 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
893 | unsigned char newhash[16]; | |
894 | int genhash; | |
895 | struct sock *sk1 = NULL; | |
896 | #endif | |
9c76a114 | 897 | int oif; |
1da177e4 | 898 | |
626e264d | 899 | if (th->rst) |
1da177e4 LT |
900 | return; |
901 | ||
626e264d IJ |
902 | if (!ipv6_unicast_destination(skb)) |
903 | return; | |
1da177e4 | 904 | |
cfb6eeb4 | 905 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
906 | hash_location = tcp_parse_md5sig_option(th); |
907 | if (!sk && hash_location) { | |
908 | /* | |
909 | * active side is lost. Try to find listening socket through | |
910 | * source port, and then find md5 key through listening socket. | |
911 | * we are not loose security here: | |
912 | * Incoming packet is checked with md5 hash with finding key, | |
913 | * no RST generated if md5 hash doesn't match. | |
914 | */ | |
915 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
916 | &tcp_hashinfo, &ipv6h->saddr, |
917 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
918 | ntohs(th->source), inet6_iif(skb)); |
919 | if (!sk1) | |
920 | return; | |
921 | ||
922 | rcu_read_lock(); | |
923 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
924 | if (!key) | |
925 | goto release_sk1; | |
926 | ||
927 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
928 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
929 | goto release_sk1; | |
930 | } else { | |
931 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
932 | } | |
cfb6eeb4 YH |
933 | #endif |
934 | ||
626e264d IJ |
935 | if (th->ack) |
936 | seq = ntohl(th->ack_seq); | |
937 | else | |
938 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
939 | (th->doff << 2); | |
1da177e4 | 940 | |
9c76a114 WY |
941 | oif = sk ? sk->sk_bound_dev_if : 0; |
942 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); | |
658ddaaf SL |
943 | |
944 | #ifdef CONFIG_TCP_MD5SIG | |
945 | release_sk1: | |
946 | if (sk1) { | |
947 | rcu_read_unlock(); | |
948 | sock_put(sk1); | |
949 | } | |
950 | #endif | |
626e264d | 951 | } |
1da177e4 | 952 | |
ee684b6f | 953 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
9c76a114 | 954 | u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
955 | struct tcp_md5sig_key *key, u8 tclass, |
956 | u32 label) | |
626e264d | 957 | { |
9c76a114 | 958 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass, |
1d13a96c | 959 | label); |
1da177e4 LT |
960 | } |
961 | ||
962 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
963 | { | |
8feaf0c0 | 964 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 965 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 966 | |
9501f972 | 967 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 968 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 969 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 970 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 971 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 972 | |
8feaf0c0 | 973 | inet_twsk_put(tw); |
1da177e4 LT |
974 | } |
975 | ||
6edafaaf GJ |
976 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
977 | struct request_sock *req) | |
1da177e4 | 978 | { |
3a19ce0e DL |
979 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
980 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
981 | */ | |
982 | tcp_v6_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? | |
983 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, | |
984 | tcp_rsk(req)->rcv_nxt, | |
9c76a114 | 985 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
986 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
987 | 0, 0); | |
1da177e4 LT |
988 | } |
989 | ||
990 | ||
4c99aa40 | 991 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 992 | { |
60236fdd | 993 | struct request_sock *req, **prev; |
aa8223c7 | 994 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
995 | struct sock *nsk; |
996 | ||
997 | /* Find possible connection requests. */ | |
8129765a | 998 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
999 | &ipv6_hdr(skb)->saddr, |
1000 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 1001 | if (req) |
8336886f | 1002 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 1003 | |
3b1e0a65 | 1004 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1005 | &ipv6_hdr(skb)->saddr, th->source, |
1006 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1007 | |
1008 | if (nsk) { | |
1009 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1010 | bh_lock_sock(nsk); | |
1011 | return nsk; | |
1012 | } | |
9469c7b4 | 1013 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1014 | return NULL; |
1015 | } | |
1016 | ||
c6aefafb | 1017 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 1018 | if (!th->syn) |
c6aefafb | 1019 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1020 | #endif |
1021 | return sk; | |
1022 | } | |
1023 | ||
1da177e4 LT |
1024 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
1025 | { | |
1da177e4 LT |
1026 | if (skb->protocol == htons(ETH_P_IP)) |
1027 | return tcp_v4_conn_request(sk, skb); | |
1028 | ||
1029 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1030 | goto drop; |
1da177e4 | 1031 | |
1fb6f159 OP |
1032 | return tcp_conn_request(&tcp6_request_sock_ops, |
1033 | &tcp_request_sock_ipv6_ops, sk, skb); | |
1da177e4 LT |
1034 | |
1035 | drop: | |
5f1e942c | 1036 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1037 | return 0; /* don't send reset */ |
1038 | } | |
1039 | ||
4c99aa40 WC |
1040 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
1041 | struct request_sock *req, | |
1042 | struct dst_entry *dst) | |
1da177e4 | 1043 | { |
634fb979 | 1044 | struct inet_request_sock *ireq; |
1da177e4 LT |
1045 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1046 | struct tcp6_sock *newtcp6sk; | |
1047 | struct inet_sock *newinet; | |
1048 | struct tcp_sock *newtp; | |
1049 | struct sock *newsk; | |
cfb6eeb4 YH |
1050 | #ifdef CONFIG_TCP_MD5SIG |
1051 | struct tcp_md5sig_key *key; | |
1052 | #endif | |
3840a06e | 1053 | struct flowi6 fl6; |
1da177e4 LT |
1054 | |
1055 | if (skb->protocol == htons(ETH_P_IP)) { | |
1056 | /* | |
1057 | * v6 mapped | |
1058 | */ | |
1059 | ||
1060 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1061 | ||
1ab1457c | 1062 | if (newsk == NULL) |
1da177e4 LT |
1063 | return NULL; |
1064 | ||
1065 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1066 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1067 | ||
1068 | newinet = inet_sk(newsk); | |
1069 | newnp = inet6_sk(newsk); | |
1070 | newtp = tcp_sk(newsk); | |
1071 | ||
1072 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1073 | ||
efe4208f | 1074 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1075 | |
c720c7e8 | 1076 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1077 | |
efe4208f | 1078 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1079 | |
8292a17a | 1080 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1081 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1082 | #ifdef CONFIG_TCP_MD5SIG |
1083 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1084 | #endif | |
1085 | ||
676a1184 YZ |
1086 | newnp->ipv6_ac_list = NULL; |
1087 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1088 | newnp->pktoptions = NULL; |
1089 | newnp->opt = NULL; | |
505cbfc5 | 1090 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1091 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1092 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1093 | if (np->repflow) |
1094 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1095 | |
e6848976 ACM |
1096 | /* |
1097 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1098 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1099 | * that function for the gory details. -acme | |
1da177e4 | 1100 | */ |
1da177e4 LT |
1101 | |
1102 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1103 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1104 | Sync it now. |
1105 | */ | |
d83d8461 | 1106 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1107 | |
1108 | return newsk; | |
1109 | } | |
1110 | ||
634fb979 | 1111 | ireq = inet_rsk(req); |
1da177e4 LT |
1112 | |
1113 | if (sk_acceptq_is_full(sk)) | |
1114 | goto out_overflow; | |
1115 | ||
493f377d | 1116 | if (!dst) { |
3840a06e | 1117 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1118 | if (!dst) |
1da177e4 | 1119 | goto out; |
1ab1457c | 1120 | } |
1da177e4 LT |
1121 | |
1122 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1123 | if (newsk == NULL) | |
093d2823 | 1124 | goto out_nonewsk; |
1da177e4 | 1125 | |
e6848976 ACM |
1126 | /* |
1127 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1128 | * count here, tcp_create_openreq_child now does this for us, see the | |
1129 | * comment in that function for the gory details. -acme | |
1130 | */ | |
1da177e4 | 1131 | |
59eed279 | 1132 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1133 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1134 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1135 | |
1136 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1137 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1138 | ||
1139 | newtp = tcp_sk(newsk); | |
1140 | newinet = inet_sk(newsk); | |
1141 | newnp = inet6_sk(newsk); | |
1142 | ||
1143 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1144 | ||
634fb979 ED |
1145 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1146 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1147 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1148 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1149 | |
b73c3d0e TH |
1150 | ip6_set_txhash(newsk); |
1151 | ||
1ab1457c | 1152 | /* Now IPv6 options... |
1da177e4 LT |
1153 | |
1154 | First: no IPv4 options. | |
1155 | */ | |
f6d8bd05 | 1156 | newinet->inet_opt = NULL; |
676a1184 | 1157 | newnp->ipv6_ac_list = NULL; |
d35690be | 1158 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1159 | |
1160 | /* Clone RX bits */ | |
1161 | newnp->rxopt.all = np->rxopt.all; | |
1162 | ||
1163 | /* Clone pktoptions received with SYN */ | |
1164 | newnp->pktoptions = NULL; | |
634fb979 ED |
1165 | if (ireq->pktopts != NULL) { |
1166 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1167 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1168 | consume_skb(ireq->pktopts); |
1169 | ireq->pktopts = NULL; | |
1da177e4 LT |
1170 | if (newnp->pktoptions) |
1171 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1172 | } | |
1173 | newnp->opt = NULL; | |
505cbfc5 | 1174 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1175 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1176 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1177 | if (np->repflow) |
1178 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1179 | |
1180 | /* Clone native IPv6 options from listening socket (if any) | |
1181 | ||
1182 | Yes, keeping reference count would be much more clever, | |
1183 | but we make one more one thing there: reattach optmem | |
1184 | to newsk. | |
1185 | */ | |
43264e0b RL |
1186 | if (np->opt) |
1187 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1188 | |
d83d8461 | 1189 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1190 | if (newnp->opt) |
d83d8461 ACM |
1191 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1192 | newnp->opt->opt_flen); | |
1da177e4 LT |
1193 | |
1194 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
0dbaee3b | 1195 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1196 | if (tcp_sk(sk)->rx_opt.user_mss && |
1197 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1198 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1199 | ||
1da177e4 LT |
1200 | tcp_initialize_rcv_mss(newsk); |
1201 | ||
c720c7e8 ED |
1202 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1203 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1204 | |
cfb6eeb4 YH |
1205 | #ifdef CONFIG_TCP_MD5SIG |
1206 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1207 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1208 | if (key != NULL) { | |
cfb6eeb4 YH |
1209 | /* We're using one, so create a matching key |
1210 | * on the newsk structure. If we fail to get | |
1211 | * memory, then we end up not copying the key | |
1212 | * across. Shucks. | |
1213 | */ | |
efe4208f | 1214 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1215 | AF_INET6, key->key, key->keylen, |
1216 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1217 | } |
1218 | #endif | |
1219 | ||
093d2823 | 1220 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1221 | inet_csk_prepare_forced_close(newsk); |
1222 | tcp_done(newsk); | |
093d2823 BS |
1223 | goto out; |
1224 | } | |
9327f705 | 1225 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1226 | |
1227 | return newsk; | |
1228 | ||
1229 | out_overflow: | |
de0744af | 1230 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1231 | out_nonewsk: |
1da177e4 | 1232 | dst_release(dst); |
093d2823 BS |
1233 | out: |
1234 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1235 | return NULL; |
1236 | } | |
1237 | ||
1da177e4 LT |
1238 | /* The socket must have it's spinlock held when we get |
1239 | * here. | |
1240 | * | |
1241 | * We have a potential double-lock case here, so even when | |
1242 | * doing backlog processing we use the BH locking scheme. | |
1243 | * This is because we cannot sleep with the original spinlock | |
1244 | * held. | |
1245 | */ | |
1246 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1247 | { | |
1248 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1249 | struct tcp_sock *tp; | |
1250 | struct sk_buff *opt_skb = NULL; | |
1251 | ||
1252 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1253 | goes to IPv4 receive handler and backlogged. | |
1254 | From backlog it always goes here. Kerboom... | |
1255 | Fortunately, tcp_rcv_established and rcv_established | |
1256 | handle them correctly, but it is not case with | |
1257 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1258 | */ | |
1259 | ||
1260 | if (skb->protocol == htons(ETH_P_IP)) | |
1261 | return tcp_v4_do_rcv(sk, skb); | |
1262 | ||
fda9ef5d | 1263 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1264 | goto discard; |
1265 | ||
1266 | /* | |
1267 | * socket locking is here for SMP purposes as backlog rcv | |
1268 | * is currently called with bh processing disabled. | |
1269 | */ | |
1270 | ||
1271 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1272 | ||
1273 | Yes, guys, it is the only place in our code, where we | |
1274 | may make it not affecting IPv4. | |
1275 | The rest of code is protocol independent, | |
1276 | and I do not like idea to uglify IPv4. | |
1277 | ||
1278 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1279 | looks not very well thought. For now we latch | |
1280 | options, received in the last packet, enqueued | |
1281 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1282 | --ANK (980728) |
1da177e4 LT |
1283 | */ |
1284 | if (np->rxopt.all) | |
99a1dec7 | 1285 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1286 | |
1287 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1288 | struct dst_entry *dst = sk->sk_rx_dst; |
1289 | ||
bdeab991 | 1290 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1291 | if (dst) { |
1292 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1293 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1294 | dst_release(dst); | |
1295 | sk->sk_rx_dst = NULL; | |
1296 | } | |
1297 | } | |
1298 | ||
c995ae22 | 1299 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1300 | if (opt_skb) |
1301 | goto ipv6_pktoptions; | |
1302 | return 0; | |
1303 | } | |
1304 | ||
ab6a5bb6 | 1305 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1306 | goto csum_err; |
1307 | ||
1ab1457c | 1308 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1309 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1310 | if (!nsk) | |
1311 | goto discard; | |
1312 | ||
1313 | /* | |
1314 | * Queue it on the new socket if the new socket is active, | |
1315 | * otherwise we just shortcircuit this and continue with | |
1316 | * the new socket.. | |
1317 | */ | |
4c99aa40 | 1318 | if (nsk != sk) { |
bdeab991 | 1319 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1320 | if (tcp_child_process(sk, nsk, skb)) |
1321 | goto reset; | |
1322 | if (opt_skb) | |
1323 | __kfree_skb(opt_skb); | |
1324 | return 0; | |
1325 | } | |
47482f13 | 1326 | } else |
bdeab991 | 1327 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1328 | |
aa8223c7 | 1329 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1330 | goto reset; |
1da177e4 LT |
1331 | if (opt_skb) |
1332 | goto ipv6_pktoptions; | |
1333 | return 0; | |
1334 | ||
1335 | reset: | |
cfb6eeb4 | 1336 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1337 | discard: |
1338 | if (opt_skb) | |
1339 | __kfree_skb(opt_skb); | |
1340 | kfree_skb(skb); | |
1341 | return 0; | |
1342 | csum_err: | |
6a5dc9e5 | 1343 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1344 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1345 | goto discard; |
1346 | ||
1347 | ||
1348 | ipv6_pktoptions: | |
1349 | /* Do you ask, what is it? | |
1350 | ||
1351 | 1. skb was enqueued by tcp. | |
1352 | 2. skb is added to tail of read queue, rather than out of order. | |
1353 | 3. socket is not in passive state. | |
1354 | 4. Finally, it really contains options, which user wants to receive. | |
1355 | */ | |
1356 | tp = tcp_sk(sk); | |
1357 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1358 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1359 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1360 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1361 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1362 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1363 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1364 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1365 | if (np->repflow) |
1366 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
1da177e4 LT |
1367 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1368 | skb_set_owner_r(opt_skb, sk); | |
1369 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1370 | } else { | |
1371 | __kfree_skb(opt_skb); | |
1372 | opt_skb = xchg(&np->pktoptions, NULL); | |
1373 | } | |
1374 | } | |
1375 | ||
800d55f1 | 1376 | kfree_skb(opt_skb); |
1da177e4 LT |
1377 | return 0; |
1378 | } | |
1379 | ||
e5bbef20 | 1380 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1381 | { |
cf533ea5 | 1382 | const struct tcphdr *th; |
b71d1d42 | 1383 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1384 | struct sock *sk; |
1385 | int ret; | |
a86b1e30 | 1386 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1387 | |
1388 | if (skb->pkt_type != PACKET_HOST) | |
1389 | goto discard_it; | |
1390 | ||
1391 | /* | |
1392 | * Count it even if it's bad. | |
1393 | */ | |
63231bdd | 1394 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1395 | |
1396 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1397 | goto discard_it; | |
1398 | ||
aa8223c7 | 1399 | th = tcp_hdr(skb); |
1da177e4 LT |
1400 | |
1401 | if (th->doff < sizeof(struct tcphdr)/4) | |
1402 | goto bad_packet; | |
1403 | if (!pskb_may_pull(skb, th->doff*4)) | |
1404 | goto discard_it; | |
1405 | ||
e4f45b7f | 1406 | if (skb_checksum_init(skb, IPPROTO_TCP, ip6_compute_pseudo)) |
6a5dc9e5 | 1407 | goto csum_error; |
1da177e4 | 1408 | |
aa8223c7 | 1409 | th = tcp_hdr(skb); |
e802af9c | 1410 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1411 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1412 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1413 | skb->len - th->doff*4); | |
1414 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1415 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1416 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1417 | TCP_SKB_CB(skb)->sacked = 0; |
1418 | ||
9a1f27c4 | 1419 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1420 | if (!sk) |
1421 | goto no_tcp_socket; | |
1422 | ||
1423 | process: | |
1424 | if (sk->sk_state == TCP_TIME_WAIT) | |
1425 | goto do_time_wait; | |
1426 | ||
e802af9c SH |
1427 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1428 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1429 | goto discard_and_relse; | |
1430 | } | |
1431 | ||
1da177e4 LT |
1432 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1433 | goto discard_and_relse; | |
1434 | ||
9ea88a15 DP |
1435 | #ifdef CONFIG_TCP_MD5SIG |
1436 | if (tcp_v6_inbound_md5_hash(sk, skb)) | |
1437 | goto discard_and_relse; | |
1438 | #endif | |
1439 | ||
fda9ef5d | 1440 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1441 | goto discard_and_relse; |
1442 | ||
8b80cda5 | 1443 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1444 | skb->dev = NULL; |
1445 | ||
293b9c42 | 1446 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1447 | ret = 0; |
1448 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1449 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1450 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1451 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1452 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1453 | if (tp->ucopy.dma_chan) |
1454 | ret = tcp_v6_do_rcv(sk, skb); | |
1455 | else | |
1a2449a8 CL |
1456 | #endif |
1457 | { | |
1458 | if (!tcp_prequeue(sk, skb)) | |
1459 | ret = tcp_v6_do_rcv(sk, skb); | |
1460 | } | |
da882c1f ED |
1461 | } else if (unlikely(sk_add_backlog(sk, skb, |
1462 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1463 | bh_unlock_sock(sk); |
6cce09f8 | 1464 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1465 | goto discard_and_relse; |
1466 | } | |
1da177e4 LT |
1467 | bh_unlock_sock(sk); |
1468 | ||
1469 | sock_put(sk); | |
1470 | return ret ? -1 : 0; | |
1471 | ||
1472 | no_tcp_socket: | |
1473 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1474 | goto discard_it; | |
1475 | ||
1476 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1477 | csum_error: |
1478 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1479 | bad_packet: |
63231bdd | 1480 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1481 | } else { |
cfb6eeb4 | 1482 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1483 | } |
1484 | ||
1485 | discard_it: | |
1da177e4 LT |
1486 | kfree_skb(skb); |
1487 | return 0; | |
1488 | ||
1489 | discard_and_relse: | |
1490 | sock_put(sk); | |
1491 | goto discard_it; | |
1492 | ||
1493 | do_time_wait: | |
1494 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1495 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1496 | goto discard_it; |
1497 | } | |
1498 | ||
6a5dc9e5 | 1499 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1500 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1501 | goto bad_packet; |
1502 | } | |
1503 | if (tcp_checksum_complete(skb)) { | |
1504 | inet_twsk_put(inet_twsk(sk)); | |
1505 | goto csum_error; | |
1da177e4 LT |
1506 | } |
1507 | ||
9469c7b4 | 1508 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1509 | case TCP_TW_SYN: |
1510 | { | |
1511 | struct sock *sk2; | |
1512 | ||
c346dca1 | 1513 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1514 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1515 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1516 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1517 | if (sk2 != NULL) { |
295ff7ed ACM |
1518 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1519 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1520 | inet_twsk_put(tw); | |
1da177e4 LT |
1521 | sk = sk2; |
1522 | goto process; | |
1523 | } | |
1524 | /* Fall through to ACK */ | |
1525 | } | |
1526 | case TCP_TW_ACK: | |
1527 | tcp_v6_timewait_ack(sk, skb); | |
1528 | break; | |
1529 | case TCP_TW_RST: | |
1530 | goto no_tcp_socket; | |
4aa956d8 WY |
1531 | case TCP_TW_SUCCESS: |
1532 | ; | |
1da177e4 LT |
1533 | } |
1534 | goto discard_it; | |
1535 | } | |
1536 | ||
c7109986 ED |
1537 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1538 | { | |
1539 | const struct ipv6hdr *hdr; | |
1540 | const struct tcphdr *th; | |
1541 | struct sock *sk; | |
1542 | ||
1543 | if (skb->pkt_type != PACKET_HOST) | |
1544 | return; | |
1545 | ||
1546 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1547 | return; | |
1548 | ||
1549 | hdr = ipv6_hdr(skb); | |
1550 | th = tcp_hdr(skb); | |
1551 | ||
1552 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1553 | return; | |
1554 | ||
1555 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1556 | &hdr->saddr, th->source, | |
1557 | &hdr->daddr, ntohs(th->dest), | |
1558 | inet6_iif(skb)); | |
1559 | if (sk) { | |
1560 | skb->sk = sk; | |
1561 | skb->destructor = sock_edemux; | |
1562 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1563 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1564 | |
c7109986 | 1565 | if (dst) |
5d299f3d | 1566 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1567 | if (dst && |
f3f12135 | 1568 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1569 | skb_dst_set_noref(skb, dst); |
1570 | } | |
1571 | } | |
1572 | } | |
1573 | ||
ccb7c410 DM |
1574 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1575 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1576 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1577 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1578 | }; |
1579 | ||
3b401a81 | 1580 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1581 | .queue_xmit = inet6_csk_xmit, |
1582 | .send_check = tcp_v6_send_check, | |
1583 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1584 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1585 | .conn_request = tcp_v6_conn_request, |
1586 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1587 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1588 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1589 | .setsockopt = ipv6_setsockopt, |
1590 | .getsockopt = ipv6_getsockopt, | |
1591 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1592 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1593 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1594 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1595 | .compat_setsockopt = compat_ipv6_setsockopt, |
1596 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1597 | #endif |
4fab9071 | 1598 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1599 | }; |
1600 | ||
cfb6eeb4 | 1601 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1602 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1603 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1604 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1605 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1606 | }; |
a928630a | 1607 | #endif |
cfb6eeb4 | 1608 | |
1da177e4 LT |
1609 | /* |
1610 | * TCP over IPv4 via INET6 API | |
1611 | */ | |
3b401a81 | 1612 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1613 | .queue_xmit = ip_queue_xmit, |
1614 | .send_check = tcp_v4_send_check, | |
1615 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1616 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1617 | .conn_request = tcp_v6_conn_request, |
1618 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1619 | .net_header_len = sizeof(struct iphdr), |
1620 | .setsockopt = ipv6_setsockopt, | |
1621 | .getsockopt = ipv6_getsockopt, | |
1622 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1623 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1624 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1625 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1626 | .compat_setsockopt = compat_ipv6_setsockopt, |
1627 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1628 | #endif |
4fab9071 | 1629 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1630 | }; |
1631 | ||
cfb6eeb4 | 1632 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1633 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1634 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1635 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1636 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1637 | }; |
a928630a | 1638 | #endif |
cfb6eeb4 | 1639 | |
1da177e4 LT |
1640 | /* NOTE: A lot of things set to zero explicitly by call to |
1641 | * sk_alloc() so need not be done here. | |
1642 | */ | |
1643 | static int tcp_v6_init_sock(struct sock *sk) | |
1644 | { | |
6687e988 | 1645 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1646 | |
900f65d3 | 1647 | tcp_init_sock(sk); |
1da177e4 | 1648 | |
8292a17a | 1649 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1650 | |
cfb6eeb4 | 1651 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1652 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1653 | #endif |
1654 | ||
1da177e4 LT |
1655 | return 0; |
1656 | } | |
1657 | ||
7d06b2e0 | 1658 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1659 | { |
1da177e4 | 1660 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1661 | inet6_destroy_sock(sk); |
1da177e4 LT |
1662 | } |
1663 | ||
952a10be | 1664 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1665 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1666 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1667 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1668 | { |
1da177e4 | 1669 | int ttd = req->expires - jiffies; |
634fb979 ED |
1670 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1671 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1672 | |
1673 | if (ttd < 0) | |
1674 | ttd = 0; | |
1675 | ||
1da177e4 LT |
1676 | seq_printf(seq, |
1677 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1678 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1679 | i, |
1680 | src->s6_addr32[0], src->s6_addr32[1], | |
1681 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1682 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1683 | dest->s6_addr32[0], dest->s6_addr32[1], |
1684 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1685 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1686 | TCP_SYN_RECV, |
4c99aa40 | 1687 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1688 | 1, /* timers active (only the expire timer) */ |
1689 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1690 | req->num_timeout, |
a7cb5a49 | 1691 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1692 | 0, /* non standard timer */ |
1da177e4 LT |
1693 | 0, /* open_requests have no inode */ |
1694 | 0, req); | |
1695 | } | |
1696 | ||
1697 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1698 | { | |
b71d1d42 | 1699 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1700 | __u16 destp, srcp; |
1701 | int timer_active; | |
1702 | unsigned long timer_expires; | |
cf533ea5 ED |
1703 | const struct inet_sock *inet = inet_sk(sp); |
1704 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1705 | const struct inet_connection_sock *icsk = inet_csk(sp); |
0a672f74 | 1706 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
1da177e4 | 1707 | |
efe4208f ED |
1708 | dest = &sp->sk_v6_daddr; |
1709 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1710 | destp = ntohs(inet->inet_dport); |
1711 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1712 | |
1713 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1714 | timer_active = 1; |
463c84b9 ACM |
1715 | timer_expires = icsk->icsk_timeout; |
1716 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1717 | timer_active = 4; |
463c84b9 | 1718 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1719 | } else if (timer_pending(&sp->sk_timer)) { |
1720 | timer_active = 2; | |
1721 | timer_expires = sp->sk_timer.expires; | |
1722 | } else { | |
1723 | timer_active = 0; | |
1724 | timer_expires = jiffies; | |
1725 | } | |
1726 | ||
1727 | seq_printf(seq, | |
1728 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1729 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1730 | i, |
1731 | src->s6_addr32[0], src->s6_addr32[1], | |
1732 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1733 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1734 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1735 | sp->sk_state, |
47da8ee6 SS |
1736 | tp->write_seq-tp->snd_una, |
1737 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1738 | timer_active, |
a399a805 | 1739 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1740 | icsk->icsk_retransmits, |
a7cb5a49 | 1741 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1742 | icsk->icsk_probes_out, |
1da177e4 LT |
1743 | sock_i_ino(sp), |
1744 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1745 | jiffies_to_clock_t(icsk->icsk_rto), |
1746 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1747 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 | 1748 | tp->snd_cwnd, |
0a672f74 YC |
1749 | sp->sk_state == TCP_LISTEN ? |
1750 | (fastopenq ? fastopenq->max_qlen : 0) : | |
1751 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh) | |
1da177e4 LT |
1752 | ); |
1753 | } | |
1754 | ||
1ab1457c | 1755 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1756 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1757 | { |
b71d1d42 | 1758 | const struct in6_addr *dest, *src; |
1da177e4 | 1759 | __u16 destp, srcp; |
96f817fe | 1760 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1761 | |
efe4208f ED |
1762 | dest = &tw->tw_v6_daddr; |
1763 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1764 | destp = ntohs(tw->tw_dport); |
1765 | srcp = ntohs(tw->tw_sport); | |
1766 | ||
1767 | seq_printf(seq, | |
1768 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1769 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1770 | i, |
1771 | src->s6_addr32[0], src->s6_addr32[1], | |
1772 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1773 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1774 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1775 | tw->tw_substate, 0, 0, | |
a399a805 | 1776 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1777 | atomic_read(&tw->tw_refcnt), tw); |
1778 | } | |
1779 | ||
1da177e4 LT |
1780 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1781 | { | |
1782 | struct tcp_iter_state *st; | |
05dbc7b5 | 1783 | struct sock *sk = v; |
1da177e4 LT |
1784 | |
1785 | if (v == SEQ_START_TOKEN) { | |
1786 | seq_puts(seq, | |
1787 | " sl " | |
1788 | "local_address " | |
1789 | "remote_address " | |
1790 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1791 | " uid timeout inode\n"); | |
1792 | goto out; | |
1793 | } | |
1794 | st = seq->private; | |
1795 | ||
1796 | switch (st->state) { | |
1797 | case TCP_SEQ_STATE_LISTENING: | |
1798 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1799 | if (sk->sk_state == TCP_TIME_WAIT) |
1800 | get_timewait6_sock(seq, v, st->num); | |
1801 | else | |
1802 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1803 | break; |
1804 | case TCP_SEQ_STATE_OPENREQ: | |
1805 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1806 | break; | |
1da177e4 LT |
1807 | } |
1808 | out: | |
1809 | return 0; | |
1810 | } | |
1811 | ||
73cb88ec AV |
1812 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1813 | .owner = THIS_MODULE, | |
1814 | .open = tcp_seq_open, | |
1815 | .read = seq_read, | |
1816 | .llseek = seq_lseek, | |
1817 | .release = seq_release_net | |
1818 | }; | |
1819 | ||
1da177e4 | 1820 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1821 | .name = "tcp6", |
1822 | .family = AF_INET6, | |
73cb88ec | 1823 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1824 | .seq_ops = { |
1825 | .show = tcp6_seq_show, | |
1826 | }, | |
1da177e4 LT |
1827 | }; |
1828 | ||
2c8c1e72 | 1829 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1830 | { |
6f8b13bc | 1831 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1832 | } |
1833 | ||
6f8b13bc | 1834 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1835 | { |
6f8b13bc | 1836 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1837 | } |
1838 | #endif | |
1839 | ||
f77d6021 ED |
1840 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1841 | { | |
1842 | struct inet_sock *inet = inet_sk(sk); | |
1843 | ||
1844 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1845 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1846 | ||
1847 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1848 | memset(&inet->pinet6 + 1, 0, size); | |
1849 | } | |
1850 | ||
1da177e4 LT |
1851 | struct proto tcpv6_prot = { |
1852 | .name = "TCPv6", | |
1853 | .owner = THIS_MODULE, | |
1854 | .close = tcp_close, | |
1855 | .connect = tcp_v6_connect, | |
1856 | .disconnect = tcp_disconnect, | |
463c84b9 | 1857 | .accept = inet_csk_accept, |
1da177e4 LT |
1858 | .ioctl = tcp_ioctl, |
1859 | .init = tcp_v6_init_sock, | |
1860 | .destroy = tcp_v6_destroy_sock, | |
1861 | .shutdown = tcp_shutdown, | |
1862 | .setsockopt = tcp_setsockopt, | |
1863 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1864 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1865 | .sendmsg = tcp_sendmsg, |
1866 | .sendpage = tcp_sendpage, | |
1da177e4 | 1867 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1868 | .release_cb = tcp_release_cb, |
1da177e4 | 1869 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1870 | .unhash = inet_unhash, |
1871 | .get_port = inet_csk_get_port, | |
1da177e4 | 1872 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1873 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1874 | .sockets_allocated = &tcp_sockets_allocated, |
1875 | .memory_allocated = &tcp_memory_allocated, | |
1876 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1877 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1878 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1879 | .sysctl_wmem = sysctl_tcp_wmem, |
1880 | .sysctl_rmem = sysctl_tcp_rmem, | |
1881 | .max_header = MAX_TCP_HEADER, | |
1882 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1883 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1884 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1885 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1886 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1887 | .no_autobind = true, |
543d9cfe ACM |
1888 | #ifdef CONFIG_COMPAT |
1889 | .compat_setsockopt = compat_tcp_setsockopt, | |
1890 | .compat_getsockopt = compat_tcp_getsockopt, | |
1891 | #endif | |
c255a458 | 1892 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1893 | .proto_cgroup = tcp_proto_cgroup, |
1894 | #endif | |
f77d6021 | 1895 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1896 | }; |
1897 | ||
41135cc8 | 1898 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1899 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1900 | .handler = tcp_v6_rcv, |
1901 | .err_handler = tcp_v6_err, | |
1902 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1903 | }; | |
1904 | ||
1da177e4 LT |
1905 | static struct inet_protosw tcpv6_protosw = { |
1906 | .type = SOCK_STREAM, | |
1907 | .protocol = IPPROTO_TCP, | |
1908 | .prot = &tcpv6_prot, | |
1909 | .ops = &inet6_stream_ops, | |
d83d8461 ACM |
1910 | .flags = INET_PROTOSW_PERMANENT | |
1911 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1912 | }; |
1913 | ||
2c8c1e72 | 1914 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1915 | { |
5677242f DL |
1916 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1917 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1918 | } |
1919 | ||
2c8c1e72 | 1920 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1921 | { |
5677242f | 1922 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1923 | } |
1924 | ||
2c8c1e72 | 1925 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1926 | { |
1927 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1928 | } |
1929 | ||
1930 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1931 | .init = tcpv6_net_init, |
1932 | .exit = tcpv6_net_exit, | |
1933 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1934 | }; |
1935 | ||
7f4e4868 | 1936 | int __init tcpv6_init(void) |
1da177e4 | 1937 | { |
7f4e4868 DL |
1938 | int ret; |
1939 | ||
3336288a VY |
1940 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1941 | if (ret) | |
c6b641a4 | 1942 | goto out; |
3336288a | 1943 | |
1da177e4 | 1944 | /* register inet6 protocol */ |
7f4e4868 DL |
1945 | ret = inet6_register_protosw(&tcpv6_protosw); |
1946 | if (ret) | |
1947 | goto out_tcpv6_protocol; | |
1948 | ||
93ec926b | 1949 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1950 | if (ret) |
1951 | goto out_tcpv6_protosw; | |
1952 | out: | |
1953 | return ret; | |
ae0f7d5f | 1954 | |
7f4e4868 DL |
1955 | out_tcpv6_protosw: |
1956 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
1957 | out_tcpv6_protocol: |
1958 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
1959 | goto out; |
1960 | } | |
1961 | ||
09f7709f | 1962 | void tcpv6_exit(void) |
7f4e4868 | 1963 | { |
93ec926b | 1964 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
1965 | inet6_unregister_protosw(&tcpv6_protosw); |
1966 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 1967 | } |