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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> |
1da177e4 LT |
42 | |
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> |
1da177e4 LT |
66 | |
67 | #include <asm/uaccess.h> | |
68 | ||
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | ||
cfb6eeb4 YH |
72 | #include <linux/crypto.h> |
73 | #include <linux/scatterlist.h> | |
74 | ||
cfb6eeb4 | 75 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
76 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
77 | struct request_sock *req); | |
1da177e4 LT |
78 | |
79 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
8ad50d96 | 80 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 ED |
81 | const struct in6_addr *saddr, |
82 | const struct in6_addr *daddr); | |
1da177e4 | 83 | |
3b401a81 SH |
84 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
85 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 86 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
87 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
88 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
89 | #else |
90 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 91 | const struct in6_addr *addr) |
9501f972 YH |
92 | { |
93 | return NULL; | |
94 | } | |
a928630a | 95 | #endif |
1da177e4 | 96 | |
1da177e4 LT |
97 | static void tcp_v6_hash(struct sock *sk) |
98 | { | |
99 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 100 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
101 | tcp_prot.hash(sk); |
102 | return; | |
103 | } | |
104 | local_bh_disable(); | |
9327f705 | 105 | __inet6_hash(sk, NULL); |
1da177e4 LT |
106 | local_bh_enable(); |
107 | } | |
108 | } | |
109 | ||
684f2176 | 110 | static __inline__ __sum16 tcp_v6_check(int len, |
b71d1d42 ED |
111 | const struct in6_addr *saddr, |
112 | const struct in6_addr *daddr, | |
868c86bc | 113 | __wsum base) |
1da177e4 LT |
114 | { |
115 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
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; | |
4e3fd7a0 | 157 | usin->sin6_addr = flowlabel->dst; |
1da177e4 LT |
158 | fl6_sock_release(flowlabel); |
159 | } | |
160 | } | |
161 | ||
162 | /* | |
1ab1457c YH |
163 | * connect() to INADDR_ANY means loopback (BSD'ism). |
164 | */ | |
165 | ||
166 | if(ipv6_addr_any(&usin->sin6_addr)) | |
167 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
168 | |
169 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
170 | ||
171 | if(addr_type & IPV6_ADDR_MULTICAST) | |
172 | return -ENETUNREACH; | |
173 | ||
174 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
175 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
176 | usin->sin6_scope_id) { | |
177 | /* If interface is set while binding, indices | |
178 | * must coincide. | |
179 | */ | |
180 | if (sk->sk_bound_dev_if && | |
181 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
182 | return -EINVAL; | |
183 | ||
184 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
185 | } | |
186 | ||
187 | /* Connect to link-local address requires an interface */ | |
188 | if (!sk->sk_bound_dev_if) | |
189 | return -EINVAL; | |
190 | } | |
191 | ||
192 | if (tp->rx_opt.ts_recent_stamp && | |
193 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
194 | tp->rx_opt.ts_recent = 0; | |
195 | tp->rx_opt.ts_recent_stamp = 0; | |
196 | tp->write_seq = 0; | |
197 | } | |
198 | ||
4e3fd7a0 | 199 | np->daddr = usin->sin6_addr; |
4c9483b2 | 200 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
201 | |
202 | /* | |
203 | * TCP over IPv4 | |
204 | */ | |
205 | ||
206 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 207 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
208 | struct sockaddr_in sin; |
209 | ||
210 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
211 | ||
212 | if (__ipv6_only_sock(sk)) | |
213 | return -ENETUNREACH; | |
214 | ||
215 | sin.sin_family = AF_INET; | |
216 | sin.sin_port = usin->sin6_port; | |
217 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
218 | ||
d83d8461 | 219 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 220 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
221 | #ifdef CONFIG_TCP_MD5SIG |
222 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
223 | #endif | |
1da177e4 LT |
224 | |
225 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
226 | ||
227 | if (err) { | |
d83d8461 ACM |
228 | icsk->icsk_ext_hdr_len = exthdrlen; |
229 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 230 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
231 | #ifdef CONFIG_TCP_MD5SIG |
232 | tp->af_specific = &tcp_sock_ipv6_specific; | |
233 | #endif | |
1da177e4 LT |
234 | goto failure; |
235 | } else { | |
c720c7e8 ED |
236 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
237 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
238 | &np->rcv_saddr); | |
1da177e4 LT |
239 | } |
240 | ||
241 | return err; | |
242 | } | |
243 | ||
244 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
245 | saddr = &np->rcv_saddr; | |
246 | ||
4c9483b2 | 247 | fl6.flowi6_proto = IPPROTO_TCP; |
4e3fd7a0 AD |
248 | fl6.daddr = np->daddr; |
249 | fl6.saddr = saddr ? *saddr : np->saddr; | |
4c9483b2 DM |
250 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
251 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
252 | fl6.fl6_dport = usin->sin6_port; |
253 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 254 | |
4c9483b2 | 255 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 256 | |
4c9483b2 | 257 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 258 | |
4c9483b2 | 259 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
260 | if (IS_ERR(dst)) { |
261 | err = PTR_ERR(dst); | |
1da177e4 | 262 | goto failure; |
14e50e57 | 263 | } |
1da177e4 LT |
264 | |
265 | if (saddr == NULL) { | |
4c9483b2 | 266 | saddr = &fl6.saddr; |
4e3fd7a0 | 267 | np->rcv_saddr = *saddr; |
1da177e4 LT |
268 | } |
269 | ||
270 | /* set the source address */ | |
4e3fd7a0 | 271 | np->saddr = *saddr; |
c720c7e8 | 272 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 273 | |
f83ef8c0 | 274 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 275 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 276 | |
493f377d DM |
277 | rt = (struct rt6_info *) dst; |
278 | if (tcp_death_row.sysctl_tw_recycle && | |
279 | !tp->rx_opt.ts_recent_stamp && | |
81166dd6 DM |
280 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) |
281 | tcp_fetch_timewait_stamp(sk, dst); | |
493f377d | 282 | |
d83d8461 | 283 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 284 | if (np->opt) |
d83d8461 ACM |
285 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
286 | np->opt->opt_nflen); | |
1da177e4 LT |
287 | |
288 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
289 | ||
c720c7e8 | 290 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
291 | |
292 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 293 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
294 | if (err) |
295 | goto late_failure; | |
296 | ||
297 | if (!tp->write_seq) | |
298 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
299 | np->daddr.s6_addr32, | |
c720c7e8 ED |
300 | inet->inet_sport, |
301 | inet->inet_dport); | |
1da177e4 LT |
302 | |
303 | err = tcp_connect(sk); | |
304 | if (err) | |
305 | goto late_failure; | |
306 | ||
307 | return 0; | |
308 | ||
309 | late_failure: | |
310 | tcp_set_state(sk, TCP_CLOSE); | |
311 | __sk_dst_reset(sk); | |
312 | failure: | |
c720c7e8 | 313 | inet->inet_dport = 0; |
1da177e4 LT |
314 | sk->sk_route_caps = 0; |
315 | return err; | |
316 | } | |
317 | ||
563d34d0 ED |
318 | static void tcp_v6_mtu_reduced(struct sock *sk) |
319 | { | |
320 | struct dst_entry *dst; | |
321 | ||
322 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
323 | return; | |
324 | ||
325 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
326 | if (!dst) | |
327 | return; | |
328 | ||
329 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
330 | tcp_sync_mss(sk, dst_mtu(dst)); | |
331 | tcp_simple_retransmit(sk); | |
332 | } | |
333 | } | |
334 | ||
1da177e4 | 335 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 336 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 337 | { |
b71d1d42 | 338 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 339 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
340 | struct ipv6_pinfo *np; |
341 | struct sock *sk; | |
342 | int err; | |
1ab1457c | 343 | struct tcp_sock *tp; |
1da177e4 | 344 | __u32 seq; |
ca12a1a4 | 345 | struct net *net = dev_net(skb->dev); |
1da177e4 | 346 | |
ca12a1a4 | 347 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 348 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
349 | |
350 | if (sk == NULL) { | |
e41b5368 DL |
351 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
352 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
353 | return; |
354 | } | |
355 | ||
356 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 357 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
358 | return; |
359 | } | |
360 | ||
361 | bh_lock_sock(sk); | |
563d34d0 | 362 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 363 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
364 | |
365 | if (sk->sk_state == TCP_CLOSE) | |
366 | goto out; | |
367 | ||
e802af9c SH |
368 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
369 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
370 | goto out; | |
371 | } | |
372 | ||
1da177e4 | 373 | tp = tcp_sk(sk); |
1ab1457c | 374 | seq = ntohl(th->seq); |
1da177e4 LT |
375 | if (sk->sk_state != TCP_LISTEN && |
376 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 377 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
378 | goto out; |
379 | } | |
380 | ||
381 | np = inet6_sk(sk); | |
382 | ||
ec18d9a2 DM |
383 | if (type == NDISC_REDIRECT) { |
384 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
385 | ||
1ed5c48f | 386 | if (dst) |
6700c270 | 387 | dst->ops->redirect(dst, sk, skb); |
ec18d9a2 DM |
388 | } |
389 | ||
1da177e4 | 390 | if (type == ICMPV6_PKT_TOOBIG) { |
563d34d0 ED |
391 | tp->mtu_info = ntohl(info); |
392 | if (!sock_owned_by_user(sk)) | |
393 | tcp_v6_mtu_reduced(sk); | |
394 | else | |
395 | set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags); | |
1da177e4 LT |
396 | goto out; |
397 | } | |
398 | ||
399 | icmpv6_err_convert(type, code, &err); | |
400 | ||
60236fdd | 401 | /* Might be for an request_sock */ |
1da177e4 | 402 | switch (sk->sk_state) { |
60236fdd | 403 | struct request_sock *req, **prev; |
1da177e4 LT |
404 | case TCP_LISTEN: |
405 | if (sock_owned_by_user(sk)) | |
406 | goto out; | |
407 | ||
8129765a ACM |
408 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
409 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
410 | if (!req) |
411 | goto out; | |
412 | ||
413 | /* ICMPs are not backlogged, hence we cannot get | |
414 | * an established socket here. | |
415 | */ | |
547b792c | 416 | WARN_ON(req->sk != NULL); |
1da177e4 | 417 | |
2e6599cb | 418 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 419 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
420 | goto out; |
421 | } | |
422 | ||
463c84b9 | 423 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
424 | goto out; |
425 | ||
426 | case TCP_SYN_SENT: | |
427 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 428 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 429 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
430 | sk->sk_err = err; |
431 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
432 | ||
433 | tcp_done(sk); | |
434 | } else | |
435 | sk->sk_err_soft = err; | |
436 | goto out; | |
437 | } | |
438 | ||
439 | if (!sock_owned_by_user(sk) && np->recverr) { | |
440 | sk->sk_err = err; | |
441 | sk->sk_error_report(sk); | |
442 | } else | |
443 | sk->sk_err_soft = err; | |
444 | ||
445 | out: | |
446 | bh_unlock_sock(sk); | |
447 | sock_put(sk); | |
448 | } | |
449 | ||
450 | ||
9f10d3f6 NC |
451 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
452 | struct flowi6 *fl6, | |
3840a06e | 453 | struct request_sock *req, |
fff32699 ED |
454 | struct request_values *rvp, |
455 | u16 queue_mapping) | |
1da177e4 | 456 | { |
ca304b61 | 457 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
458 | struct ipv6_pinfo *np = inet6_sk(sk); |
459 | struct sk_buff * skb; | |
9494218f | 460 | int err = -ENOMEM; |
1da177e4 | 461 | |
9f10d3f6 NC |
462 | /* First, grab a route. */ |
463 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 464 | goto done; |
9494218f | 465 | |
e6b4d113 | 466 | skb = tcp_make_synack(sk, dst, req, rvp); |
9494218f | 467 | |
1da177e4 | 468 | if (skb) { |
8ad50d96 | 469 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 470 | |
9f10d3f6 | 471 | fl6->daddr = treq->rmt_addr; |
fff32699 | 472 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 473 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 474 | err = net_xmit_eval(err); |
1da177e4 LT |
475 | } |
476 | ||
477 | done: | |
1da177e4 LT |
478 | return err; |
479 | } | |
480 | ||
72659ecc OP |
481 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
482 | struct request_values *rvp) | |
483 | { | |
9f10d3f6 NC |
484 | struct flowi6 fl6; |
485 | ||
72659ecc | 486 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
9f10d3f6 | 487 | return tcp_v6_send_synack(sk, NULL, &fl6, req, rvp, 0); |
72659ecc OP |
488 | } |
489 | ||
60236fdd | 490 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 491 | { |
800d55f1 | 492 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
493 | } |
494 | ||
cfb6eeb4 YH |
495 | #ifdef CONFIG_TCP_MD5SIG |
496 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 497 | const struct in6_addr *addr) |
cfb6eeb4 | 498 | { |
a915da9b | 499 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
500 | } |
501 | ||
502 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
503 | struct sock *addr_sk) | |
504 | { | |
505 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
506 | } | |
507 | ||
508 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
509 | struct request_sock *req) | |
510 | { | |
511 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
512 | } | |
513 | ||
cfb6eeb4 YH |
514 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
515 | int optlen) | |
516 | { | |
517 | struct tcp_md5sig cmd; | |
518 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
519 | |
520 | if (optlen < sizeof(cmd)) | |
521 | return -EINVAL; | |
522 | ||
523 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
524 | return -EFAULT; | |
525 | ||
526 | if (sin6->sin6_family != AF_INET6) | |
527 | return -EINVAL; | |
528 | ||
529 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 530 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
531 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
532 | AF_INET); | |
533 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
534 | AF_INET6); | |
cfb6eeb4 YH |
535 | } |
536 | ||
537 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
538 | return -EINVAL; | |
539 | ||
a915da9b ED |
540 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
541 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
542 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 543 | |
a915da9b ED |
544 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
545 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
546 | } |
547 | ||
49a72dfb | 548 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
549 | const struct in6_addr *daddr, |
550 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 551 | { |
cfb6eeb4 | 552 | struct tcp6_pseudohdr *bp; |
49a72dfb | 553 | struct scatterlist sg; |
8d26d76d | 554 | |
cfb6eeb4 | 555 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 556 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
557 | bp->saddr = *saddr; |
558 | bp->daddr = *daddr; | |
49a72dfb | 559 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 560 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 561 | |
49a72dfb AL |
562 | sg_init_one(&sg, bp, sizeof(*bp)); |
563 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
564 | } | |
c7da57a1 | 565 | |
49a72dfb | 566 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 567 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 568 | const struct tcphdr *th) |
49a72dfb AL |
569 | { |
570 | struct tcp_md5sig_pool *hp; | |
571 | struct hash_desc *desc; | |
572 | ||
573 | hp = tcp_get_md5sig_pool(); | |
574 | if (!hp) | |
575 | goto clear_hash_noput; | |
576 | desc = &hp->md5_desc; | |
577 | ||
578 | if (crypto_hash_init(desc)) | |
579 | goto clear_hash; | |
580 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
581 | goto clear_hash; | |
582 | if (tcp_md5_hash_header(hp, th)) | |
583 | goto clear_hash; | |
584 | if (tcp_md5_hash_key(hp, key)) | |
585 | goto clear_hash; | |
586 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 587 | goto clear_hash; |
cfb6eeb4 | 588 | |
cfb6eeb4 | 589 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 590 | return 0; |
49a72dfb | 591 | |
cfb6eeb4 YH |
592 | clear_hash: |
593 | tcp_put_md5sig_pool(); | |
594 | clear_hash_noput: | |
595 | memset(md5_hash, 0, 16); | |
49a72dfb | 596 | return 1; |
cfb6eeb4 YH |
597 | } |
598 | ||
49a72dfb | 599 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
600 | const struct sock *sk, |
601 | const struct request_sock *req, | |
602 | const struct sk_buff *skb) | |
cfb6eeb4 | 603 | { |
b71d1d42 | 604 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
605 | struct tcp_md5sig_pool *hp; |
606 | struct hash_desc *desc; | |
318cf7aa | 607 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
608 | |
609 | if (sk) { | |
610 | saddr = &inet6_sk(sk)->saddr; | |
611 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 612 | } else if (req) { |
cfb6eeb4 YH |
613 | saddr = &inet6_rsk(req)->loc_addr; |
614 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 615 | } else { |
b71d1d42 | 616 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
617 | saddr = &ip6h->saddr; |
618 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 619 | } |
49a72dfb AL |
620 | |
621 | hp = tcp_get_md5sig_pool(); | |
622 | if (!hp) | |
623 | goto clear_hash_noput; | |
624 | desc = &hp->md5_desc; | |
625 | ||
626 | if (crypto_hash_init(desc)) | |
627 | goto clear_hash; | |
628 | ||
629 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
630 | goto clear_hash; | |
631 | if (tcp_md5_hash_header(hp, th)) | |
632 | goto clear_hash; | |
633 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
634 | goto clear_hash; | |
635 | if (tcp_md5_hash_key(hp, key)) | |
636 | goto clear_hash; | |
637 | if (crypto_hash_final(desc, md5_hash)) | |
638 | goto clear_hash; | |
639 | ||
640 | tcp_put_md5sig_pool(); | |
641 | return 0; | |
642 | ||
643 | clear_hash: | |
644 | tcp_put_md5sig_pool(); | |
645 | clear_hash_noput: | |
646 | memset(md5_hash, 0, 16); | |
647 | return 1; | |
cfb6eeb4 YH |
648 | } |
649 | ||
318cf7aa | 650 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 651 | { |
cf533ea5 | 652 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 653 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 654 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 655 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 656 | int genhash; |
cfb6eeb4 YH |
657 | u8 newhash[16]; |
658 | ||
659 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 660 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 661 | |
785957d3 DM |
662 | /* We've parsed the options - do we have a hash? */ |
663 | if (!hash_expected && !hash_location) | |
664 | return 0; | |
665 | ||
666 | if (hash_expected && !hash_location) { | |
667 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
668 | return 1; |
669 | } | |
670 | ||
785957d3 DM |
671 | if (!hash_expected && hash_location) { |
672 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
673 | return 1; |
674 | } | |
675 | ||
676 | /* check the signature */ | |
49a72dfb AL |
677 | genhash = tcp_v6_md5_hash_skb(newhash, |
678 | hash_expected, | |
679 | NULL, NULL, skb); | |
680 | ||
cfb6eeb4 | 681 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
682 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
683 | genhash ? "failed" : "mismatch", | |
684 | &ip6h->saddr, ntohs(th->source), | |
685 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
686 | return 1; |
687 | } | |
688 | return 0; | |
689 | } | |
690 | #endif | |
691 | ||
c6aefafb | 692 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 693 | .family = AF_INET6, |
2e6599cb | 694 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 695 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
696 | .send_ack = tcp_v6_reqsk_send_ack, |
697 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
698 | .send_reset = tcp_v6_send_reset, |
699 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
700 | }; |
701 | ||
cfb6eeb4 | 702 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 703 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 704 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 705 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 706 | }; |
b6332e6c | 707 | #endif |
cfb6eeb4 | 708 | |
8ad50d96 | 709 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 | 710 | const struct in6_addr *saddr, const struct in6_addr *daddr) |
1da177e4 | 711 | { |
aa8223c7 | 712 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 713 | |
84fa7933 | 714 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 715 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 716 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 717 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 718 | } else { |
8ad50d96 HX |
719 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
720 | csum_partial(th, th->doff << 2, | |
721 | skb->csum)); | |
1da177e4 LT |
722 | } |
723 | } | |
724 | ||
bb296246 | 725 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
726 | { |
727 | struct ipv6_pinfo *np = inet6_sk(sk); | |
728 | ||
729 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
730 | } | |
731 | ||
a430a43d HX |
732 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
733 | { | |
b71d1d42 | 734 | const struct ipv6hdr *ipv6h; |
a430a43d HX |
735 | struct tcphdr *th; |
736 | ||
737 | if (!pskb_may_pull(skb, sizeof(*th))) | |
738 | return -EINVAL; | |
739 | ||
0660e03f | 740 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 741 | th = tcp_hdr(skb); |
a430a43d HX |
742 | |
743 | th->check = 0; | |
84fa7933 | 744 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 745 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
746 | return 0; |
747 | } | |
1da177e4 | 748 | |
36990673 HX |
749 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
750 | struct sk_buff *skb) | |
684f2176 | 751 | { |
b71d1d42 | 752 | const struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
753 | |
754 | switch (skb->ip_summed) { | |
755 | case CHECKSUM_COMPLETE: | |
86911732 | 756 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
757 | skb->csum)) { |
758 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
759 | break; | |
760 | } | |
761 | ||
762 | /* fall through */ | |
763 | case CHECKSUM_NONE: | |
764 | NAPI_GRO_CB(skb)->flush = 1; | |
765 | return NULL; | |
766 | } | |
767 | ||
768 | return tcp_gro_receive(head, skb); | |
769 | } | |
684f2176 | 770 | |
36990673 | 771 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 | 772 | { |
b71d1d42 | 773 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
684f2176 HX |
774 | struct tcphdr *th = tcp_hdr(skb); |
775 | ||
776 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
777 | &iph->saddr, &iph->daddr, 0); | |
778 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
779 | ||
780 | return tcp_gro_complete(skb); | |
781 | } | |
684f2176 | 782 | |
626e264d | 783 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
b903d324 | 784 | u32 ts, struct tcp_md5sig_key *key, int rst, u8 tclass) |
1da177e4 | 785 | { |
cf533ea5 ED |
786 | const struct tcphdr *th = tcp_hdr(skb); |
787 | struct tcphdr *t1; | |
1da177e4 | 788 | struct sk_buff *buff; |
4c9483b2 | 789 | struct flowi6 fl6; |
adf30907 | 790 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 791 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 792 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 793 | struct dst_entry *dst; |
81ada62d | 794 | __be32 *topt; |
1da177e4 | 795 | |
626e264d IJ |
796 | if (ts) |
797 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 798 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
799 | if (key) |
800 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
801 | #endif | |
802 | ||
cfb6eeb4 | 803 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 804 | GFP_ATOMIC); |
1ab1457c YH |
805 | if (buff == NULL) |
806 | return; | |
1da177e4 | 807 | |
cfb6eeb4 | 808 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 809 | |
cfb6eeb4 | 810 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 811 | skb_reset_transport_header(buff); |
1da177e4 LT |
812 | |
813 | /* Swap the send and the receive. */ | |
814 | memset(t1, 0, sizeof(*t1)); | |
815 | t1->dest = th->source; | |
816 | t1->source = th->dest; | |
cfb6eeb4 | 817 | t1->doff = tot_len / 4; |
626e264d IJ |
818 | t1->seq = htonl(seq); |
819 | t1->ack_seq = htonl(ack); | |
820 | t1->ack = !rst || !th->ack; | |
821 | t1->rst = rst; | |
822 | t1->window = htons(win); | |
1da177e4 | 823 | |
81ada62d IJ |
824 | topt = (__be32 *)(t1 + 1); |
825 | ||
626e264d IJ |
826 | if (ts) { |
827 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
828 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
829 | *topt++ = htonl(tcp_time_stamp); | |
830 | *topt++ = htonl(ts); | |
831 | } | |
832 | ||
cfb6eeb4 YH |
833 | #ifdef CONFIG_TCP_MD5SIG |
834 | if (key) { | |
81ada62d IJ |
835 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
836 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
837 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
838 | &ipv6_hdr(skb)->saddr, |
839 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
840 | } |
841 | #endif | |
842 | ||
4c9483b2 | 843 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
844 | fl6.daddr = ipv6_hdr(skb)->saddr; |
845 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 846 | |
e5700aff DM |
847 | buff->ip_summed = CHECKSUM_PARTIAL; |
848 | buff->csum = 0; | |
849 | ||
4c9483b2 | 850 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 851 | |
4c9483b2 DM |
852 | fl6.flowi6_proto = IPPROTO_TCP; |
853 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
854 | fl6.fl6_dport = t1->dest; |
855 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 856 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 857 | |
c20121ae DL |
858 | /* Pass a socket to ip6_dst_lookup either it is for RST |
859 | * Underlying function will use this to retrieve the network | |
860 | * namespace | |
861 | */ | |
4c9483b2 | 862 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
863 | if (!IS_ERR(dst)) { |
864 | skb_dst_set(buff, dst); | |
b903d324 | 865 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
866 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
867 | if (rst) | |
868 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
869 | return; | |
1da177e4 LT |
870 | } |
871 | ||
872 | kfree_skb(buff); | |
873 | } | |
874 | ||
626e264d | 875 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 876 | { |
cf533ea5 | 877 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 878 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 879 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
880 | #ifdef CONFIG_TCP_MD5SIG |
881 | const __u8 *hash_location = NULL; | |
882 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
883 | unsigned char newhash[16]; | |
884 | int genhash; | |
885 | struct sock *sk1 = NULL; | |
886 | #endif | |
1da177e4 | 887 | |
626e264d | 888 | if (th->rst) |
1da177e4 LT |
889 | return; |
890 | ||
626e264d IJ |
891 | if (!ipv6_unicast_destination(skb)) |
892 | return; | |
1da177e4 | 893 | |
cfb6eeb4 | 894 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
895 | hash_location = tcp_parse_md5sig_option(th); |
896 | if (!sk && hash_location) { | |
897 | /* | |
898 | * active side is lost. Try to find listening socket through | |
899 | * source port, and then find md5 key through listening socket. | |
900 | * we are not loose security here: | |
901 | * Incoming packet is checked with md5 hash with finding key, | |
902 | * no RST generated if md5 hash doesn't match. | |
903 | */ | |
904 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
905 | &tcp_hashinfo, &ipv6h->daddr, | |
906 | ntohs(th->source), inet6_iif(skb)); | |
907 | if (!sk1) | |
908 | return; | |
909 | ||
910 | rcu_read_lock(); | |
911 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
912 | if (!key) | |
913 | goto release_sk1; | |
914 | ||
915 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
916 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
917 | goto release_sk1; | |
918 | } else { | |
919 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
920 | } | |
cfb6eeb4 YH |
921 | #endif |
922 | ||
626e264d IJ |
923 | if (th->ack) |
924 | seq = ntohl(th->ack_seq); | |
925 | else | |
926 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
927 | (th->doff << 2); | |
1da177e4 | 928 | |
b903d324 | 929 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1, 0); |
658ddaaf SL |
930 | |
931 | #ifdef CONFIG_TCP_MD5SIG | |
932 | release_sk1: | |
933 | if (sk1) { | |
934 | rcu_read_unlock(); | |
935 | sock_put(sk1); | |
936 | } | |
937 | #endif | |
626e264d | 938 | } |
1da177e4 | 939 | |
626e264d | 940 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
b903d324 | 941 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 942 | { |
b903d324 | 943 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0, tclass); |
1da177e4 LT |
944 | } |
945 | ||
946 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
947 | { | |
8feaf0c0 | 948 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 949 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 950 | |
9501f972 | 951 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 952 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
b903d324 ED |
953 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
954 | tw->tw_tclass); | |
1da177e4 | 955 | |
8feaf0c0 | 956 | inet_twsk_put(tw); |
1da177e4 LT |
957 | } |
958 | ||
6edafaaf GJ |
959 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
960 | struct request_sock *req) | |
1da177e4 | 961 | { |
9501f972 | 962 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
b903d324 | 963 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
964 | } |
965 | ||
966 | ||
967 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
968 | { | |
60236fdd | 969 | struct request_sock *req, **prev; |
aa8223c7 | 970 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
971 | struct sock *nsk; |
972 | ||
973 | /* Find possible connection requests. */ | |
8129765a | 974 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
975 | &ipv6_hdr(skb)->saddr, |
976 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
977 | if (req) |
978 | return tcp_check_req(sk, skb, req, prev); | |
979 | ||
3b1e0a65 | 980 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
981 | &ipv6_hdr(skb)->saddr, th->source, |
982 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
983 | |
984 | if (nsk) { | |
985 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
986 | bh_lock_sock(nsk); | |
987 | return nsk; | |
988 | } | |
9469c7b4 | 989 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
990 | return NULL; |
991 | } | |
992 | ||
c6aefafb | 993 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 994 | if (!th->syn) |
c6aefafb | 995 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
996 | #endif |
997 | return sk; | |
998 | } | |
999 | ||
1da177e4 LT |
1000 | /* FIXME: this is substantially similar to the ipv4 code. |
1001 | * Can some kind of merge be done? -- erics | |
1002 | */ | |
1003 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1004 | { | |
4957faad | 1005 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1006 | struct tcp_options_received tmp_opt; |
cf533ea5 | 1007 | const u8 *hash_location; |
e6b4d113 | 1008 | struct request_sock *req; |
ca304b61 | 1009 | struct inet6_request_sock *treq; |
1da177e4 | 1010 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1011 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1012 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 1013 | struct dst_entry *dst = NULL; |
3840a06e | 1014 | struct flowi6 fl6; |
a2a385d6 | 1015 | bool want_cookie = false; |
1da177e4 LT |
1016 | |
1017 | if (skb->protocol == htons(ETH_P_IP)) | |
1018 | return tcp_v4_conn_request(sk, skb); | |
1019 | ||
1020 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1021 | goto drop; |
1da177e4 | 1022 | |
463c84b9 | 1023 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
946cedcc ED |
1024 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
1025 | if (!want_cookie) | |
1026 | goto drop; | |
1da177e4 LT |
1027 | } |
1028 | ||
463c84b9 | 1029 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1030 | goto drop; |
1031 | ||
ca304b61 | 1032 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1033 | if (req == NULL) |
1034 | goto drop; | |
1035 | ||
cfb6eeb4 YH |
1036 | #ifdef CONFIG_TCP_MD5SIG |
1037 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1038 | #endif | |
1039 | ||
1da177e4 LT |
1040 | tcp_clear_options(&tmp_opt); |
1041 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1042 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
2100c8d2 | 1043 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0, NULL); |
4957faad WAS |
1044 | |
1045 | if (tmp_opt.cookie_plus > 0 && | |
1046 | tmp_opt.saw_tstamp && | |
1047 | !tp->rx_opt.cookie_out_never && | |
1048 | (sysctl_tcp_cookie_size > 0 || | |
1049 | (tp->cookie_values != NULL && | |
1050 | tp->cookie_values->cookie_desired > 0))) { | |
1051 | u8 *c; | |
1052 | u32 *d; | |
1053 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1054 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1055 | ||
1056 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1057 | goto drop_and_free; | |
1058 | ||
1059 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1060 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1061 | *mess++ ^= *d++; |
1062 | *mess++ ^= *d++; | |
1063 | *mess++ ^= *d++; | |
1064 | *mess++ ^= *d++; | |
0eae88f3 | 1065 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1066 | *mess++ ^= *d++; |
1067 | *mess++ ^= *d++; | |
1068 | *mess++ ^= *d++; | |
1069 | *mess++ ^= *d++; | |
1070 | ||
1071 | /* plus variable length Initiator Cookie */ | |
1072 | c = (u8 *)mess; | |
1073 | while (l-- > 0) | |
1074 | *c++ ^= *hash_location++; | |
1da177e4 | 1075 | |
a2a385d6 | 1076 | want_cookie = false; /* not our kind of cookie */ |
4957faad WAS |
1077 | tmp_ext.cookie_out_never = 0; /* false */ |
1078 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1079 | } else if (!tp->rx_opt.cookie_in_always) { | |
1080 | /* redundant indications, but ensure initialization. */ | |
1081 | tmp_ext.cookie_out_never = 1; /* true */ | |
1082 | tmp_ext.cookie_plus = 0; | |
1083 | } else { | |
1084 | goto drop_and_free; | |
1085 | } | |
1086 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1087 | |
4dfc2817 | 1088 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1089 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1090 | |
1da177e4 LT |
1091 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1092 | tcp_openreq_init(req, &tmp_opt, skb); | |
1093 | ||
ca304b61 | 1094 | treq = inet6_rsk(req); |
4e3fd7a0 AD |
1095 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
1096 | treq->loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1097 | if (!want_cookie || tmp_opt.tstamp_ok) |
bd14b1b2 | 1098 | TCP_ECN_create_request(req, skb); |
c6aefafb | 1099 | |
4d0fe50c ED |
1100 | treq->iif = sk->sk_bound_dev_if; |
1101 | ||
1102 | /* So that link locals have meaning */ | |
1103 | if (!sk->sk_bound_dev_if && | |
1104 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1105 | treq->iif = inet6_iif(skb); | |
1106 | ||
2bbdf389 | 1107 | if (!isn) { |
c6aefafb GG |
1108 | if (ipv6_opt_accepted(sk, skb) || |
1109 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1110 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1111 | atomic_inc(&skb->users); | |
1112 | treq->pktopts = skb; | |
1113 | } | |
493f377d DM |
1114 | |
1115 | if (want_cookie) { | |
2bbdf389 FW |
1116 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1117 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1118 | goto have_isn; |
1119 | } | |
1120 | ||
1121 | /* VJ's idea. We save last timestamp seen | |
1122 | * from the destination in peer table, when entering | |
1123 | * state TIME-WAIT, and check against it before | |
1124 | * accepting new connection request. | |
1125 | * | |
1126 | * If "isn" is not zero, this request hit alive | |
1127 | * timewait bucket, so that all the necessary checks | |
1128 | * are made in the function processing timewait state. | |
1129 | */ | |
1130 | if (tmp_opt.saw_tstamp && | |
1131 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1132 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1133 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1134 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1135 | goto drop_and_release; | |
1136 | } | |
1137 | } | |
1138 | /* Kill the following clause, if you dislike this way. */ | |
1139 | else if (!sysctl_tcp_syncookies && | |
1140 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1141 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1142 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1143 | /* Without syncookies last quarter of |
1144 | * backlog is filled with destinations, | |
1145 | * proven to be alive. | |
1146 | * It means that we continue to communicate | |
1147 | * to destinations, already remembered | |
1148 | * to the moment of synflood. | |
1149 | */ | |
1150 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1151 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1152 | goto drop_and_release; | |
2bbdf389 | 1153 | } |
493f377d DM |
1154 | |
1155 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1156 | } |
493f377d | 1157 | have_isn: |
2e6599cb | 1158 | tcp_rsk(req)->snt_isn = isn; |
9ad7c049 | 1159 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
1da177e4 | 1160 | |
437c5b53 NC |
1161 | if (security_inet_conn_request(sk, skb, req)) |
1162 | goto drop_and_release; | |
4237c75c | 1163 | |
9f10d3f6 | 1164 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 ED |
1165 | (struct request_values *)&tmp_ext, |
1166 | skb_get_queue_mapping(skb)) || | |
4957faad | 1167 | want_cookie) |
e6b4d113 | 1168 | goto drop_and_free; |
1da177e4 | 1169 | |
e6b4d113 WAS |
1170 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1171 | return 0; | |
1da177e4 | 1172 | |
493f377d DM |
1173 | drop_and_release: |
1174 | dst_release(dst); | |
e6b4d113 WAS |
1175 | drop_and_free: |
1176 | reqsk_free(req); | |
1da177e4 | 1177 | drop: |
1da177e4 LT |
1178 | return 0; /* don't send reset */ |
1179 | } | |
1180 | ||
1181 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1182 | struct request_sock *req, |
1da177e4 LT |
1183 | struct dst_entry *dst) |
1184 | { | |
78d15e82 | 1185 | struct inet6_request_sock *treq; |
1da177e4 LT |
1186 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1187 | struct tcp6_sock *newtcp6sk; | |
1188 | struct inet_sock *newinet; | |
1189 | struct tcp_sock *newtp; | |
1190 | struct sock *newsk; | |
cfb6eeb4 YH |
1191 | #ifdef CONFIG_TCP_MD5SIG |
1192 | struct tcp_md5sig_key *key; | |
1193 | #endif | |
3840a06e | 1194 | struct flowi6 fl6; |
1da177e4 LT |
1195 | |
1196 | if (skb->protocol == htons(ETH_P_IP)) { | |
1197 | /* | |
1198 | * v6 mapped | |
1199 | */ | |
1200 | ||
1201 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1202 | ||
1ab1457c | 1203 | if (newsk == NULL) |
1da177e4 LT |
1204 | return NULL; |
1205 | ||
1206 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1207 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1208 | ||
1209 | newinet = inet_sk(newsk); | |
1210 | newnp = inet6_sk(newsk); | |
1211 | newtp = tcp_sk(newsk); | |
1212 | ||
1213 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1214 | ||
c720c7e8 | 1215 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1216 | |
c720c7e8 | 1217 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1218 | |
4e3fd7a0 | 1219 | newnp->rcv_saddr = newnp->saddr; |
1da177e4 | 1220 | |
8292a17a | 1221 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1222 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1223 | #ifdef CONFIG_TCP_MD5SIG |
1224 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1225 | #endif | |
1226 | ||
676a1184 YZ |
1227 | newnp->ipv6_ac_list = NULL; |
1228 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1229 | newnp->pktoptions = NULL; |
1230 | newnp->opt = NULL; | |
505cbfc5 | 1231 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1232 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
4c507d28 | 1233 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
1da177e4 | 1234 | |
e6848976 ACM |
1235 | /* |
1236 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1237 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1238 | * that function for the gory details. -acme | |
1da177e4 | 1239 | */ |
1da177e4 LT |
1240 | |
1241 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1242 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1243 | Sync it now. |
1244 | */ | |
d83d8461 | 1245 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1246 | |
1247 | return newsk; | |
1248 | } | |
1249 | ||
78d15e82 | 1250 | treq = inet6_rsk(req); |
1da177e4 LT |
1251 | |
1252 | if (sk_acceptq_is_full(sk)) | |
1253 | goto out_overflow; | |
1254 | ||
493f377d | 1255 | if (!dst) { |
3840a06e | 1256 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1257 | if (!dst) |
1da177e4 | 1258 | goto out; |
1ab1457c | 1259 | } |
1da177e4 LT |
1260 | |
1261 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1262 | if (newsk == NULL) | |
093d2823 | 1263 | goto out_nonewsk; |
1da177e4 | 1264 | |
e6848976 ACM |
1265 | /* |
1266 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1267 | * count here, tcp_create_openreq_child now does this for us, see the | |
1268 | * comment in that function for the gory details. -acme | |
1269 | */ | |
1da177e4 | 1270 | |
59eed279 | 1271 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1272 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1273 | |
1274 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1275 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1276 | ||
1277 | newtp = tcp_sk(newsk); | |
1278 | newinet = inet_sk(newsk); | |
1279 | newnp = inet6_sk(newsk); | |
1280 | ||
1281 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1282 | ||
4e3fd7a0 AD |
1283 | newnp->daddr = treq->rmt_addr; |
1284 | newnp->saddr = treq->loc_addr; | |
1285 | newnp->rcv_saddr = treq->loc_addr; | |
2e6599cb | 1286 | newsk->sk_bound_dev_if = treq->iif; |
1da177e4 | 1287 | |
1ab1457c | 1288 | /* Now IPv6 options... |
1da177e4 LT |
1289 | |
1290 | First: no IPv4 options. | |
1291 | */ | |
f6d8bd05 | 1292 | newinet->inet_opt = NULL; |
676a1184 | 1293 | newnp->ipv6_ac_list = NULL; |
d35690be | 1294 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1295 | |
1296 | /* Clone RX bits */ | |
1297 | newnp->rxopt.all = np->rxopt.all; | |
1298 | ||
1299 | /* Clone pktoptions received with SYN */ | |
1300 | newnp->pktoptions = NULL; | |
2e6599cb | 1301 | if (treq->pktopts != NULL) { |
99a1dec7 MG |
1302 | newnp->pktoptions = skb_clone(treq->pktopts, |
1303 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
ab185d7b | 1304 | consume_skb(treq->pktopts); |
2e6599cb | 1305 | treq->pktopts = NULL; |
1da177e4 LT |
1306 | if (newnp->pktoptions) |
1307 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1308 | } | |
1309 | newnp->opt = NULL; | |
505cbfc5 | 1310 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1311 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
4c507d28 | 1312 | newnp->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); |
1da177e4 LT |
1313 | |
1314 | /* Clone native IPv6 options from listening socket (if any) | |
1315 | ||
1316 | Yes, keeping reference count would be much more clever, | |
1317 | but we make one more one thing there: reattach optmem | |
1318 | to newsk. | |
1319 | */ | |
43264e0b RL |
1320 | if (np->opt) |
1321 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1322 | |
d83d8461 | 1323 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1324 | if (newnp->opt) |
d83d8461 ACM |
1325 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1326 | newnp->opt->opt_flen); | |
1da177e4 | 1327 | |
5d424d5a | 1328 | tcp_mtup_init(newsk); |
1da177e4 | 1329 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1330 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1331 | if (tcp_sk(sk)->rx_opt.user_mss && |
1332 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1333 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1334 | ||
1da177e4 | 1335 | tcp_initialize_rcv_mss(newsk); |
9ad7c049 JC |
1336 | if (tcp_rsk(req)->snt_synack) |
1337 | tcp_valid_rtt_meas(newsk, | |
1338 | tcp_time_stamp - tcp_rsk(req)->snt_synack); | |
1339 | newtp->total_retrans = req->retrans; | |
1da177e4 | 1340 | |
c720c7e8 ED |
1341 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1342 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1343 | |
cfb6eeb4 YH |
1344 | #ifdef CONFIG_TCP_MD5SIG |
1345 | /* Copy over the MD5 key from the original socket */ | |
1346 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1347 | /* We're using one, so create a matching key | |
1348 | * on the newsk structure. If we fail to get | |
1349 | * memory, then we end up not copying the key | |
1350 | * across. Shucks. | |
1351 | */ | |
a915da9b | 1352 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, |
99a1dec7 MG |
1353 | AF_INET6, key->key, key->keylen, |
1354 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1355 | } |
1356 | #endif | |
1357 | ||
093d2823 BS |
1358 | if (__inet_inherit_port(sk, newsk) < 0) { |
1359 | sock_put(newsk); | |
1360 | goto out; | |
1361 | } | |
9327f705 | 1362 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1363 | |
1364 | return newsk; | |
1365 | ||
1366 | out_overflow: | |
de0744af | 1367 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1368 | out_nonewsk: |
1da177e4 | 1369 | dst_release(dst); |
093d2823 BS |
1370 | out: |
1371 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1372 | return NULL; |
1373 | } | |
1374 | ||
b51655b9 | 1375 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1376 | { |
84fa7933 | 1377 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1378 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1379 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1380 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1381 | return 0; |
fb286bb2 | 1382 | } |
1da177e4 | 1383 | } |
fb286bb2 | 1384 | |
684f2176 | 1385 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1386 | &ipv6_hdr(skb)->saddr, |
1387 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1388 | |
1da177e4 | 1389 | if (skb->len <= 76) { |
fb286bb2 | 1390 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1391 | } |
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | /* The socket must have it's spinlock held when we get | |
1396 | * here. | |
1397 | * | |
1398 | * We have a potential double-lock case here, so even when | |
1399 | * doing backlog processing we use the BH locking scheme. | |
1400 | * This is because we cannot sleep with the original spinlock | |
1401 | * held. | |
1402 | */ | |
1403 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1404 | { | |
1405 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1406 | struct tcp_sock *tp; | |
1407 | struct sk_buff *opt_skb = NULL; | |
1408 | ||
1409 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1410 | goes to IPv4 receive handler and backlogged. | |
1411 | From backlog it always goes here. Kerboom... | |
1412 | Fortunately, tcp_rcv_established and rcv_established | |
1413 | handle them correctly, but it is not case with | |
1414 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1415 | */ | |
1416 | ||
1417 | if (skb->protocol == htons(ETH_P_IP)) | |
1418 | return tcp_v4_do_rcv(sk, skb); | |
1419 | ||
cfb6eeb4 YH |
1420 | #ifdef CONFIG_TCP_MD5SIG |
1421 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1422 | goto discard; | |
1423 | #endif | |
1424 | ||
fda9ef5d | 1425 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1426 | goto discard; |
1427 | ||
1428 | /* | |
1429 | * socket locking is here for SMP purposes as backlog rcv | |
1430 | * is currently called with bh processing disabled. | |
1431 | */ | |
1432 | ||
1433 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1434 | ||
1435 | Yes, guys, it is the only place in our code, where we | |
1436 | may make it not affecting IPv4. | |
1437 | The rest of code is protocol independent, | |
1438 | and I do not like idea to uglify IPv4. | |
1439 | ||
1440 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1441 | looks not very well thought. For now we latch | |
1442 | options, received in the last packet, enqueued | |
1443 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1444 | --ANK (980728) |
1da177e4 LT |
1445 | */ |
1446 | if (np->rxopt.all) | |
99a1dec7 | 1447 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1448 | |
1449 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1450 | struct dst_entry *dst = sk->sk_rx_dst; |
1451 | ||
bdeab991 | 1452 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1453 | if (dst) { |
1454 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1455 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1456 | dst_release(dst); | |
1457 | sk->sk_rx_dst = NULL; | |
1458 | } | |
1459 | } | |
1460 | ||
aa8223c7 | 1461 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1462 | goto reset; |
1da177e4 LT |
1463 | if (opt_skb) |
1464 | goto ipv6_pktoptions; | |
1465 | return 0; | |
1466 | } | |
1467 | ||
ab6a5bb6 | 1468 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1469 | goto csum_err; |
1470 | ||
1ab1457c | 1471 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1472 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1473 | if (!nsk) | |
1474 | goto discard; | |
1475 | ||
1476 | /* | |
1477 | * Queue it on the new socket if the new socket is active, | |
1478 | * otherwise we just shortcircuit this and continue with | |
1479 | * the new socket.. | |
1480 | */ | |
1ab1457c | 1481 | if(nsk != sk) { |
bdeab991 | 1482 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1483 | if (tcp_child_process(sk, nsk, skb)) |
1484 | goto reset; | |
1485 | if (opt_skb) | |
1486 | __kfree_skb(opt_skb); | |
1487 | return 0; | |
1488 | } | |
47482f13 | 1489 | } else |
bdeab991 | 1490 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1491 | |
aa8223c7 | 1492 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1493 | goto reset; |
1da177e4 LT |
1494 | if (opt_skb) |
1495 | goto ipv6_pktoptions; | |
1496 | return 0; | |
1497 | ||
1498 | reset: | |
cfb6eeb4 | 1499 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1500 | discard: |
1501 | if (opt_skb) | |
1502 | __kfree_skb(opt_skb); | |
1503 | kfree_skb(skb); | |
1504 | return 0; | |
1505 | csum_err: | |
63231bdd | 1506 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1507 | goto discard; |
1508 | ||
1509 | ||
1510 | ipv6_pktoptions: | |
1511 | /* Do you ask, what is it? | |
1512 | ||
1513 | 1. skb was enqueued by tcp. | |
1514 | 2. skb is added to tail of read queue, rather than out of order. | |
1515 | 3. socket is not in passive state. | |
1516 | 4. Finally, it really contains options, which user wants to receive. | |
1517 | */ | |
1518 | tp = tcp_sk(sk); | |
1519 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1520 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1521 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1522 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1523 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1524 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
4c507d28 JB |
1525 | if (np->rxopt.bits.rxtclass) |
1526 | np->rcv_tclass = ipv6_tclass(ipv6_hdr(skb)); | |
1da177e4 LT |
1527 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1528 | skb_set_owner_r(opt_skb, sk); | |
1529 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1530 | } else { | |
1531 | __kfree_skb(opt_skb); | |
1532 | opt_skb = xchg(&np->pktoptions, NULL); | |
1533 | } | |
1534 | } | |
1535 | ||
800d55f1 | 1536 | kfree_skb(opt_skb); |
1da177e4 LT |
1537 | return 0; |
1538 | } | |
1539 | ||
e5bbef20 | 1540 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1541 | { |
cf533ea5 | 1542 | const struct tcphdr *th; |
b71d1d42 | 1543 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1544 | struct sock *sk; |
1545 | int ret; | |
a86b1e30 | 1546 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1547 | |
1548 | if (skb->pkt_type != PACKET_HOST) | |
1549 | goto discard_it; | |
1550 | ||
1551 | /* | |
1552 | * Count it even if it's bad. | |
1553 | */ | |
63231bdd | 1554 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1555 | |
1556 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1557 | goto discard_it; | |
1558 | ||
aa8223c7 | 1559 | th = tcp_hdr(skb); |
1da177e4 LT |
1560 | |
1561 | if (th->doff < sizeof(struct tcphdr)/4) | |
1562 | goto bad_packet; | |
1563 | if (!pskb_may_pull(skb, th->doff*4)) | |
1564 | goto discard_it; | |
1565 | ||
60476372 | 1566 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1567 | goto bad_packet; |
1568 | ||
aa8223c7 | 1569 | th = tcp_hdr(skb); |
e802af9c | 1570 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1571 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1572 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1573 | skb->len - th->doff*4); | |
1574 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1575 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1576 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1577 | TCP_SKB_CB(skb)->sacked = 0; |
1578 | ||
9a1f27c4 | 1579 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1580 | if (!sk) |
1581 | goto no_tcp_socket; | |
1582 | ||
1583 | process: | |
1584 | if (sk->sk_state == TCP_TIME_WAIT) | |
1585 | goto do_time_wait; | |
1586 | ||
e802af9c SH |
1587 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1588 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1589 | goto discard_and_relse; | |
1590 | } | |
1591 | ||
1da177e4 LT |
1592 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1593 | goto discard_and_relse; | |
1594 | ||
fda9ef5d | 1595 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1596 | goto discard_and_relse; |
1597 | ||
1598 | skb->dev = NULL; | |
1599 | ||
293b9c42 | 1600 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1601 | ret = 0; |
1602 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1603 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1604 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1605 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1606 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1607 | if (tp->ucopy.dma_chan) |
1608 | ret = tcp_v6_do_rcv(sk, skb); | |
1609 | else | |
1a2449a8 CL |
1610 | #endif |
1611 | { | |
1612 | if (!tcp_prequeue(sk, skb)) | |
1613 | ret = tcp_v6_do_rcv(sk, skb); | |
1614 | } | |
da882c1f ED |
1615 | } else if (unlikely(sk_add_backlog(sk, skb, |
1616 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1617 | bh_unlock_sock(sk); |
6cce09f8 | 1618 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1619 | goto discard_and_relse; |
1620 | } | |
1da177e4 LT |
1621 | bh_unlock_sock(sk); |
1622 | ||
1623 | sock_put(sk); | |
1624 | return ret ? -1 : 0; | |
1625 | ||
1626 | no_tcp_socket: | |
1627 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1628 | goto discard_it; | |
1629 | ||
1630 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1631 | bad_packet: | |
63231bdd | 1632 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1633 | } else { |
cfb6eeb4 | 1634 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1635 | } |
1636 | ||
1637 | discard_it: | |
1638 | ||
1639 | /* | |
1640 | * Discard frame | |
1641 | */ | |
1642 | ||
1643 | kfree_skb(skb); | |
1644 | return 0; | |
1645 | ||
1646 | discard_and_relse: | |
1647 | sock_put(sk); | |
1648 | goto discard_it; | |
1649 | ||
1650 | do_time_wait: | |
1651 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1652 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1653 | goto discard_it; |
1654 | } | |
1655 | ||
1656 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1657 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1658 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1659 | goto discard_it; |
1660 | } | |
1661 | ||
9469c7b4 | 1662 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1663 | case TCP_TW_SYN: |
1664 | { | |
1665 | struct sock *sk2; | |
1666 | ||
c346dca1 | 1667 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1668 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1669 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1670 | if (sk2 != NULL) { |
295ff7ed ACM |
1671 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1672 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1673 | inet_twsk_put(tw); | |
1da177e4 LT |
1674 | sk = sk2; |
1675 | goto process; | |
1676 | } | |
1677 | /* Fall through to ACK */ | |
1678 | } | |
1679 | case TCP_TW_ACK: | |
1680 | tcp_v6_timewait_ack(sk, skb); | |
1681 | break; | |
1682 | case TCP_TW_RST: | |
1683 | goto no_tcp_socket; | |
1684 | case TCP_TW_SUCCESS:; | |
1685 | } | |
1686 | goto discard_it; | |
1687 | } | |
1688 | ||
c7109986 ED |
1689 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1690 | { | |
1691 | const struct ipv6hdr *hdr; | |
1692 | const struct tcphdr *th; | |
1693 | struct sock *sk; | |
1694 | ||
1695 | if (skb->pkt_type != PACKET_HOST) | |
1696 | return; | |
1697 | ||
1698 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1699 | return; | |
1700 | ||
1701 | hdr = ipv6_hdr(skb); | |
1702 | th = tcp_hdr(skb); | |
1703 | ||
1704 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1705 | return; | |
1706 | ||
1707 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1708 | &hdr->saddr, th->source, | |
1709 | &hdr->daddr, ntohs(th->dest), | |
1710 | inet6_iif(skb)); | |
1711 | if (sk) { | |
1712 | skb->sk = sk; | |
1713 | skb->destructor = sock_edemux; | |
1714 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1715 | struct dst_entry *dst = sk->sk_rx_dst; | |
1716 | struct inet_sock *icsk = inet_sk(sk); | |
1717 | if (dst) | |
5d299f3d | 1718 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1719 | if (dst && |
5d299f3d | 1720 | icsk->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1721 | skb_dst_set_noref(skb, dst); |
1722 | } | |
1723 | } | |
1724 | } | |
1725 | ||
ccb7c410 DM |
1726 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1727 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1728 | .twsk_unique = tcp_twsk_unique, | |
1729 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1730 | }; |
1731 | ||
5d299f3d ED |
1732 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
1733 | { | |
1734 | struct dst_entry *dst = skb_dst(skb); | |
1735 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
1736 | ||
1737 | dst_hold(dst); | |
1738 | sk->sk_rx_dst = dst; | |
1739 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
1740 | if (rt->rt6i_node) | |
1741 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
1742 | } | |
1743 | ||
3b401a81 | 1744 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1745 | .queue_xmit = inet6_csk_xmit, |
1746 | .send_check = tcp_v6_send_check, | |
1747 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1748 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1749 | .conn_request = tcp_v6_conn_request, |
1750 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1751 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1752 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1753 | .setsockopt = ipv6_setsockopt, |
1754 | .getsockopt = ipv6_getsockopt, | |
1755 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1756 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1757 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1758 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1759 | .compat_setsockopt = compat_ipv6_setsockopt, |
1760 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1761 | #endif |
1da177e4 LT |
1762 | }; |
1763 | ||
cfb6eeb4 | 1764 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1765 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1766 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1767 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1768 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1769 | }; |
a928630a | 1770 | #endif |
cfb6eeb4 | 1771 | |
1da177e4 LT |
1772 | /* |
1773 | * TCP over IPv4 via INET6 API | |
1774 | */ | |
1775 | ||
3b401a81 | 1776 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1777 | .queue_xmit = ip_queue_xmit, |
1778 | .send_check = tcp_v4_send_check, | |
1779 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1780 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1781 | .conn_request = tcp_v6_conn_request, |
1782 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1783 | .net_header_len = sizeof(struct iphdr), |
1784 | .setsockopt = ipv6_setsockopt, | |
1785 | .getsockopt = ipv6_getsockopt, | |
1786 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1787 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1788 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1789 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1790 | .compat_setsockopt = compat_ipv6_setsockopt, |
1791 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1792 | #endif |
1da177e4 LT |
1793 | }; |
1794 | ||
cfb6eeb4 | 1795 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1796 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1797 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1798 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1799 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1800 | }; |
a928630a | 1801 | #endif |
cfb6eeb4 | 1802 | |
1da177e4 LT |
1803 | /* NOTE: A lot of things set to zero explicitly by call to |
1804 | * sk_alloc() so need not be done here. | |
1805 | */ | |
1806 | static int tcp_v6_init_sock(struct sock *sk) | |
1807 | { | |
6687e988 | 1808 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1809 | |
900f65d3 | 1810 | tcp_init_sock(sk); |
1da177e4 | 1811 | |
8292a17a | 1812 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1813 | |
cfb6eeb4 | 1814 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1815 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1816 | #endif |
1817 | ||
1da177e4 LT |
1818 | return 0; |
1819 | } | |
1820 | ||
7d06b2e0 | 1821 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1822 | { |
1da177e4 | 1823 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1824 | inet6_destroy_sock(sk); |
1da177e4 LT |
1825 | } |
1826 | ||
952a10be | 1827 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1828 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1829 | static void get_openreq6(struct seq_file *seq, |
cf533ea5 | 1830 | const struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 1831 | { |
1da177e4 | 1832 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
1833 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1834 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1835 | |
1836 | if (ttd < 0) | |
1837 | ttd = 0; | |
1838 | ||
1da177e4 LT |
1839 | seq_printf(seq, |
1840 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1841 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1842 | i, |
1843 | src->s6_addr32[0], src->s6_addr32[1], | |
1844 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1845 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1846 | dest->s6_addr32[0], dest->s6_addr32[1], |
1847 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1848 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1849 | TCP_SYN_RECV, |
1850 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1851 | 1, /* timers active (only the expire timer) */ |
1852 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
1853 | req->retrans, |
1854 | uid, | |
1ab1457c | 1855 | 0, /* non standard timer */ |
1da177e4 LT |
1856 | 0, /* open_requests have no inode */ |
1857 | 0, req); | |
1858 | } | |
1859 | ||
1860 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1861 | { | |
b71d1d42 | 1862 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1863 | __u16 destp, srcp; |
1864 | int timer_active; | |
1865 | unsigned long timer_expires; | |
cf533ea5 ED |
1866 | const struct inet_sock *inet = inet_sk(sp); |
1867 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1868 | const struct inet_connection_sock *icsk = inet_csk(sp); |
cf533ea5 | 1869 | const struct ipv6_pinfo *np = inet6_sk(sp); |
1da177e4 LT |
1870 | |
1871 | dest = &np->daddr; | |
1872 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1873 | destp = ntohs(inet->inet_dport); |
1874 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1875 | |
1876 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1877 | timer_active = 1; |
463c84b9 ACM |
1878 | timer_expires = icsk->icsk_timeout; |
1879 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1880 | timer_active = 4; |
463c84b9 | 1881 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1882 | } else if (timer_pending(&sp->sk_timer)) { |
1883 | timer_active = 2; | |
1884 | timer_expires = sp->sk_timer.expires; | |
1885 | } else { | |
1886 | timer_active = 0; | |
1887 | timer_expires = jiffies; | |
1888 | } | |
1889 | ||
1890 | seq_printf(seq, | |
1891 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1892 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1893 | i, |
1894 | src->s6_addr32[0], src->s6_addr32[1], | |
1895 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1896 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1897 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1898 | sp->sk_state, |
47da8ee6 SS |
1899 | tp->write_seq-tp->snd_una, |
1900 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
1901 | timer_active, |
1902 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 1903 | icsk->icsk_retransmits, |
1da177e4 | 1904 | sock_i_uid(sp), |
6687e988 | 1905 | icsk->icsk_probes_out, |
1da177e4 LT |
1906 | sock_i_ino(sp), |
1907 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1908 | jiffies_to_clock_t(icsk->icsk_rto), |
1909 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1910 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1911 | tp->snd_cwnd, |
1912 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1913 | ); |
1914 | } | |
1915 | ||
1ab1457c | 1916 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1917 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1918 | { |
b71d1d42 | 1919 | const struct in6_addr *dest, *src; |
1da177e4 | 1920 | __u16 destp, srcp; |
cf533ea5 | 1921 | const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
1922 | int ttd = tw->tw_ttd - jiffies; |
1923 | ||
1924 | if (ttd < 0) | |
1925 | ttd = 0; | |
1926 | ||
0fa1a53e ACM |
1927 | dest = &tw6->tw_v6_daddr; |
1928 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1929 | destp = ntohs(tw->tw_dport); |
1930 | srcp = ntohs(tw->tw_sport); | |
1931 | ||
1932 | seq_printf(seq, | |
1933 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1934 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1935 | i, |
1936 | src->s6_addr32[0], src->s6_addr32[1], | |
1937 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1938 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1939 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1940 | tw->tw_substate, 0, 0, | |
1941 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
1942 | atomic_read(&tw->tw_refcnt), tw); | |
1943 | } | |
1944 | ||
1da177e4 LT |
1945 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1946 | { | |
1947 | struct tcp_iter_state *st; | |
1948 | ||
1949 | if (v == SEQ_START_TOKEN) { | |
1950 | seq_puts(seq, | |
1951 | " sl " | |
1952 | "local_address " | |
1953 | "remote_address " | |
1954 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1955 | " uid timeout inode\n"); | |
1956 | goto out; | |
1957 | } | |
1958 | st = seq->private; | |
1959 | ||
1960 | switch (st->state) { | |
1961 | case TCP_SEQ_STATE_LISTENING: | |
1962 | case TCP_SEQ_STATE_ESTABLISHED: | |
1963 | get_tcp6_sock(seq, v, st->num); | |
1964 | break; | |
1965 | case TCP_SEQ_STATE_OPENREQ: | |
1966 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1967 | break; | |
1968 | case TCP_SEQ_STATE_TIME_WAIT: | |
1969 | get_timewait6_sock(seq, v, st->num); | |
1970 | break; | |
1971 | } | |
1972 | out: | |
1973 | return 0; | |
1974 | } | |
1975 | ||
73cb88ec AV |
1976 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1977 | .owner = THIS_MODULE, | |
1978 | .open = tcp_seq_open, | |
1979 | .read = seq_read, | |
1980 | .llseek = seq_lseek, | |
1981 | .release = seq_release_net | |
1982 | }; | |
1983 | ||
1da177e4 | 1984 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1985 | .name = "tcp6", |
1986 | .family = AF_INET6, | |
73cb88ec | 1987 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1988 | .seq_ops = { |
1989 | .show = tcp6_seq_show, | |
1990 | }, | |
1da177e4 LT |
1991 | }; |
1992 | ||
2c8c1e72 | 1993 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1994 | { |
6f8b13bc | 1995 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1996 | } |
1997 | ||
6f8b13bc | 1998 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1999 | { |
6f8b13bc | 2000 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2001 | } |
2002 | #endif | |
2003 | ||
2004 | struct proto tcpv6_prot = { | |
2005 | .name = "TCPv6", | |
2006 | .owner = THIS_MODULE, | |
2007 | .close = tcp_close, | |
2008 | .connect = tcp_v6_connect, | |
2009 | .disconnect = tcp_disconnect, | |
463c84b9 | 2010 | .accept = inet_csk_accept, |
1da177e4 LT |
2011 | .ioctl = tcp_ioctl, |
2012 | .init = tcp_v6_init_sock, | |
2013 | .destroy = tcp_v6_destroy_sock, | |
2014 | .shutdown = tcp_shutdown, | |
2015 | .setsockopt = tcp_setsockopt, | |
2016 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2017 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2018 | .sendmsg = tcp_sendmsg, |
2019 | .sendpage = tcp_sendpage, | |
1da177e4 | 2020 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 2021 | .release_cb = tcp_release_cb, |
563d34d0 | 2022 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 2023 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
2024 | .unhash = inet_unhash, |
2025 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2026 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2027 | .sockets_allocated = &tcp_sockets_allocated, | |
2028 | .memory_allocated = &tcp_memory_allocated, | |
2029 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2030 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2031 | .sysctl_wmem = sysctl_tcp_wmem, |
2032 | .sysctl_rmem = sysctl_tcp_rmem, | |
2033 | .max_header = MAX_TCP_HEADER, | |
2034 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2035 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2036 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2037 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2038 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2039 | .no_autobind = true, |
543d9cfe ACM |
2040 | #ifdef CONFIG_COMPAT |
2041 | .compat_setsockopt = compat_tcp_setsockopt, | |
2042 | .compat_getsockopt = compat_tcp_getsockopt, | |
2043 | #endif | |
c255a458 | 2044 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
2045 | .proto_cgroup = tcp_proto_cgroup, |
2046 | #endif | |
1da177e4 LT |
2047 | }; |
2048 | ||
41135cc8 | 2049 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 2050 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
2051 | .handler = tcp_v6_rcv, |
2052 | .err_handler = tcp_v6_err, | |
a430a43d | 2053 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2054 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2055 | .gro_receive = tcp6_gro_receive, |
2056 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2057 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2058 | }; | |
2059 | ||
1da177e4 LT |
2060 | static struct inet_protosw tcpv6_protosw = { |
2061 | .type = SOCK_STREAM, | |
2062 | .protocol = IPPROTO_TCP, | |
2063 | .prot = &tcpv6_prot, | |
2064 | .ops = &inet6_stream_ops, | |
1da177e4 | 2065 | .no_check = 0, |
d83d8461 ACM |
2066 | .flags = INET_PROTOSW_PERMANENT | |
2067 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2068 | }; |
2069 | ||
2c8c1e72 | 2070 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2071 | { |
5677242f DL |
2072 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2073 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2074 | } |
2075 | ||
2c8c1e72 | 2076 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2077 | { |
5677242f | 2078 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2079 | } |
2080 | ||
2c8c1e72 | 2081 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2082 | { |
2083 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2084 | } |
2085 | ||
2086 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2087 | .init = tcpv6_net_init, |
2088 | .exit = tcpv6_net_exit, | |
2089 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2090 | }; |
2091 | ||
7f4e4868 | 2092 | int __init tcpv6_init(void) |
1da177e4 | 2093 | { |
7f4e4868 DL |
2094 | int ret; |
2095 | ||
2096 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2097 | if (ret) | |
2098 | goto out; | |
2099 | ||
1da177e4 | 2100 | /* register inet6 protocol */ |
7f4e4868 DL |
2101 | ret = inet6_register_protosw(&tcpv6_protosw); |
2102 | if (ret) | |
2103 | goto out_tcpv6_protocol; | |
2104 | ||
93ec926b | 2105 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2106 | if (ret) |
2107 | goto out_tcpv6_protosw; | |
2108 | out: | |
2109 | return ret; | |
ae0f7d5f | 2110 | |
7f4e4868 DL |
2111 | out_tcpv6_protocol: |
2112 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2113 | out_tcpv6_protosw: | |
2114 | inet6_unregister_protosw(&tcpv6_protosw); | |
2115 | goto out; | |
2116 | } | |
2117 | ||
09f7709f | 2118 | void tcpv6_exit(void) |
7f4e4868 | 2119 | { |
93ec926b | 2120 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2121 | inet6_unregister_protosw(&tcpv6_protosw); |
2122 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2123 | } |