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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> |
076bb0c8 | 66 | #include <net/busy_poll.h> |
1da177e4 LT |
67 | |
68 | #include <asm/uaccess.h> | |
69 | ||
70 | #include <linux/proc_fs.h> | |
71 | #include <linux/seq_file.h> | |
72 | ||
cfb6eeb4 YH |
73 | #include <linux/crypto.h> |
74 | #include <linux/scatterlist.h> | |
75 | ||
cfb6eeb4 | 76 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
77 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
78 | struct request_sock *req); | |
1da177e4 LT |
79 | |
80 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 81 | |
3b401a81 SH |
82 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
83 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 84 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
87 | #else |
88 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 89 | const struct in6_addr *addr) |
9501f972 YH |
90 | { |
91 | return NULL; | |
92 | } | |
a928630a | 93 | #endif |
1da177e4 | 94 | |
fae6ef87 NC |
95 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
96 | { | |
97 | struct dst_entry *dst = skb_dst(skb); | |
98 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
99 | ||
100 | dst_hold(dst); | |
101 | sk->sk_rx_dst = dst; | |
102 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
103 | if (rt->rt6i_node) | |
104 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
105 | } | |
106 | ||
1da177e4 LT |
107 | static void tcp_v6_hash(struct sock *sk) |
108 | { | |
109 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 110 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
111 | tcp_prot.hash(sk); |
112 | return; | |
113 | } | |
114 | local_bh_disable(); | |
9327f705 | 115 | __inet6_hash(sk, NULL); |
1da177e4 LT |
116 | local_bh_enable(); |
117 | } | |
118 | } | |
119 | ||
cf533ea5 | 120 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 121 | { |
0660e03f ACM |
122 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
123 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
124 | tcp_hdr(skb)->dest, |
125 | tcp_hdr(skb)->source); | |
1da177e4 LT |
126 | } |
127 | ||
1ab1457c | 128 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
129 | int addr_len) |
130 | { | |
131 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 132 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 133 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
134 | struct ipv6_pinfo *np = inet6_sk(sk); |
135 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 136 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 137 | struct rt6_info *rt; |
4c9483b2 | 138 | struct flowi6 fl6; |
1da177e4 LT |
139 | struct dst_entry *dst; |
140 | int addr_type; | |
141 | int err; | |
142 | ||
1ab1457c | 143 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
144 | return -EINVAL; |
145 | ||
1ab1457c | 146 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 147 | return -EAFNOSUPPORT; |
1da177e4 | 148 | |
4c9483b2 | 149 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
150 | |
151 | if (np->sndflow) { | |
4c9483b2 DM |
152 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
153 | IP6_ECN_flow_init(fl6.flowlabel); | |
154 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 155 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 156 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
157 | if (flowlabel == NULL) |
158 | return -EINVAL; | |
4e3fd7a0 | 159 | usin->sin6_addr = flowlabel->dst; |
1da177e4 LT |
160 | fl6_sock_release(flowlabel); |
161 | } | |
162 | } | |
163 | ||
164 | /* | |
1ab1457c YH |
165 | * connect() to INADDR_ANY means loopback (BSD'ism). |
166 | */ | |
167 | ||
168 | if(ipv6_addr_any(&usin->sin6_addr)) | |
169 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
170 | |
171 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
172 | ||
173 | if(addr_type & IPV6_ADDR_MULTICAST) | |
174 | return -ENETUNREACH; | |
175 | ||
176 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
177 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
178 | usin->sin6_scope_id) { | |
179 | /* If interface is set while binding, indices | |
180 | * must coincide. | |
181 | */ | |
182 | if (sk->sk_bound_dev_if && | |
183 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
184 | return -EINVAL; | |
185 | ||
186 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
187 | } | |
188 | ||
189 | /* Connect to link-local address requires an interface */ | |
190 | if (!sk->sk_bound_dev_if) | |
191 | return -EINVAL; | |
192 | } | |
193 | ||
194 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 195 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
196 | tp->rx_opt.ts_recent = 0; |
197 | tp->rx_opt.ts_recent_stamp = 0; | |
198 | tp->write_seq = 0; | |
199 | } | |
200 | ||
efe4208f | 201 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 202 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
203 | |
204 | /* | |
205 | * TCP over IPv4 | |
206 | */ | |
207 | ||
208 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 209 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
210 | struct sockaddr_in sin; |
211 | ||
212 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
213 | ||
214 | if (__ipv6_only_sock(sk)) | |
215 | return -ENETUNREACH; | |
216 | ||
217 | sin.sin_family = AF_INET; | |
218 | sin.sin_port = usin->sin6_port; | |
219 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
220 | ||
d83d8461 | 221 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 222 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
223 | #ifdef CONFIG_TCP_MD5SIG |
224 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
225 | #endif | |
1da177e4 LT |
226 | |
227 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
228 | ||
229 | if (err) { | |
d83d8461 ACM |
230 | icsk->icsk_ext_hdr_len = exthdrlen; |
231 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 232 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
233 | #ifdef CONFIG_TCP_MD5SIG |
234 | tp->af_specific = &tcp_sock_ipv6_specific; | |
235 | #endif | |
1da177e4 LT |
236 | goto failure; |
237 | } else { | |
c720c7e8 ED |
238 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
239 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
efe4208f | 240 | &sk->sk_v6_rcv_saddr); |
1da177e4 LT |
241 | } |
242 | ||
243 | return err; | |
244 | } | |
245 | ||
efe4208f ED |
246 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
247 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 248 | |
4c9483b2 | 249 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 250 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 251 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
252 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
253 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
254 | fl6.fl6_dport = usin->sin6_port; |
255 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 256 | |
4c9483b2 | 257 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 258 | |
4c9483b2 | 259 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 260 | |
4c9483b2 | 261 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
262 | if (IS_ERR(dst)) { |
263 | err = PTR_ERR(dst); | |
1da177e4 | 264 | goto failure; |
14e50e57 | 265 | } |
1da177e4 LT |
266 | |
267 | if (saddr == NULL) { | |
4c9483b2 | 268 | saddr = &fl6.saddr; |
efe4208f | 269 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
270 | } |
271 | ||
272 | /* set the source address */ | |
4e3fd7a0 | 273 | np->saddr = *saddr; |
c720c7e8 | 274 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 275 | |
f83ef8c0 | 276 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 277 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 278 | |
493f377d DM |
279 | rt = (struct rt6_info *) dst; |
280 | if (tcp_death_row.sysctl_tw_recycle && | |
281 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 282 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 283 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 284 | |
d83d8461 | 285 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 286 | if (np->opt) |
d83d8461 ACM |
287 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
288 | np->opt->opt_nflen); | |
1da177e4 LT |
289 | |
290 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
291 | ||
c720c7e8 | 292 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
293 | |
294 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 295 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
296 | if (err) |
297 | goto late_failure; | |
298 | ||
2b916477 | 299 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 300 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 301 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
302 | inet->inet_sport, |
303 | inet->inet_dport); | |
1da177e4 LT |
304 | |
305 | err = tcp_connect(sk); | |
306 | if (err) | |
307 | goto late_failure; | |
308 | ||
309 | return 0; | |
310 | ||
311 | late_failure: | |
312 | tcp_set_state(sk, TCP_CLOSE); | |
313 | __sk_dst_reset(sk); | |
314 | failure: | |
c720c7e8 | 315 | inet->inet_dport = 0; |
1da177e4 LT |
316 | sk->sk_route_caps = 0; |
317 | return err; | |
318 | } | |
319 | ||
563d34d0 ED |
320 | static void tcp_v6_mtu_reduced(struct sock *sk) |
321 | { | |
322 | struct dst_entry *dst; | |
323 | ||
324 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
325 | return; | |
326 | ||
327 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
328 | if (!dst) | |
329 | return; | |
330 | ||
331 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
332 | tcp_sync_mss(sk, dst_mtu(dst)); | |
333 | tcp_simple_retransmit(sk); | |
334 | } | |
335 | } | |
336 | ||
1da177e4 | 337 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 338 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 339 | { |
b71d1d42 | 340 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 341 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
342 | struct ipv6_pinfo *np; |
343 | struct sock *sk; | |
344 | int err; | |
1ab1457c | 345 | struct tcp_sock *tp; |
1da177e4 | 346 | __u32 seq; |
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); |
1da177e4 LT |
377 | if (sk->sk_state != TCP_LISTEN && |
378 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 379 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
380 | goto out; |
381 | } | |
382 | ||
383 | np = inet6_sk(sk); | |
384 | ||
ec18d9a2 DM |
385 | if (type == NDISC_REDIRECT) { |
386 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
387 | ||
1ed5c48f | 388 | if (dst) |
6700c270 | 389 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 390 | goto out; |
ec18d9a2 DM |
391 | } |
392 | ||
1da177e4 | 393 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
394 | /* We are not interested in TCP_LISTEN and open_requests |
395 | * (SYN-ACKs send out by Linux are always <576bytes so | |
396 | * they should go through unfragmented). | |
397 | */ | |
398 | if (sk->sk_state == TCP_LISTEN) | |
399 | goto out; | |
400 | ||
563d34d0 ED |
401 | tp->mtu_info = ntohl(info); |
402 | if (!sock_owned_by_user(sk)) | |
403 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
404 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
405 | &tp->tsq_flags)) | |
406 | sock_hold(sk); | |
1da177e4 LT |
407 | goto out; |
408 | } | |
409 | ||
410 | icmpv6_err_convert(type, code, &err); | |
411 | ||
60236fdd | 412 | /* Might be for an request_sock */ |
1da177e4 | 413 | switch (sk->sk_state) { |
60236fdd | 414 | struct request_sock *req, **prev; |
1da177e4 LT |
415 | case TCP_LISTEN: |
416 | if (sock_owned_by_user(sk)) | |
417 | goto out; | |
418 | ||
8129765a ACM |
419 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
420 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
421 | if (!req) |
422 | goto out; | |
423 | ||
424 | /* ICMPs are not backlogged, hence we cannot get | |
425 | * an established socket here. | |
426 | */ | |
547b792c | 427 | WARN_ON(req->sk != NULL); |
1da177e4 | 428 | |
2e6599cb | 429 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 430 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
431 | goto out; |
432 | } | |
433 | ||
463c84b9 | 434 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 435 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
436 | goto out; |
437 | ||
438 | case TCP_SYN_SENT: | |
439 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 440 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 441 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
442 | sk->sk_err = err; |
443 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
444 | ||
445 | tcp_done(sk); | |
446 | } else | |
447 | sk->sk_err_soft = err; | |
448 | goto out; | |
449 | } | |
450 | ||
451 | if (!sock_owned_by_user(sk) && np->recverr) { | |
452 | sk->sk_err = err; | |
453 | sk->sk_error_report(sk); | |
454 | } else | |
455 | sk->sk_err_soft = err; | |
456 | ||
457 | out: | |
458 | bh_unlock_sock(sk); | |
459 | sock_put(sk); | |
460 | } | |
461 | ||
462 | ||
9f10d3f6 NC |
463 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
464 | struct flowi6 *fl6, | |
3840a06e | 465 | struct request_sock *req, |
fff32699 | 466 | u16 queue_mapping) |
1da177e4 | 467 | { |
ca304b61 | 468 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
469 | struct ipv6_pinfo *np = inet6_sk(sk); |
470 | struct sk_buff * skb; | |
9494218f | 471 | int err = -ENOMEM; |
1da177e4 | 472 | |
9f10d3f6 NC |
473 | /* First, grab a route. */ |
474 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 475 | goto done; |
9494218f | 476 | |
1a2c6181 | 477 | skb = tcp_make_synack(sk, dst, req, NULL); |
9494218f | 478 | |
1da177e4 | 479 | if (skb) { |
8ad50d96 | 480 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 481 | |
9f10d3f6 | 482 | fl6->daddr = treq->rmt_addr; |
fff32699 | 483 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 484 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 485 | err = net_xmit_eval(err); |
1da177e4 LT |
486 | } |
487 | ||
488 | done: | |
1da177e4 LT |
489 | return err; |
490 | } | |
491 | ||
1a2c6181 | 492 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
72659ecc | 493 | { |
9f10d3f6 | 494 | struct flowi6 fl6; |
e6c022a4 | 495 | int res; |
9f10d3f6 | 496 | |
1a2c6181 | 497 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); |
e6c022a4 ED |
498 | if (!res) |
499 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
500 | return res; | |
72659ecc OP |
501 | } |
502 | ||
60236fdd | 503 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 504 | { |
800d55f1 | 505 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
506 | } |
507 | ||
cfb6eeb4 YH |
508 | #ifdef CONFIG_TCP_MD5SIG |
509 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 510 | const struct in6_addr *addr) |
cfb6eeb4 | 511 | { |
a915da9b | 512 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
513 | } |
514 | ||
515 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
516 | struct sock *addr_sk) | |
517 | { | |
efe4208f | 518 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
519 | } |
520 | ||
521 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
522 | struct request_sock *req) | |
523 | { | |
524 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
525 | } | |
526 | ||
cfb6eeb4 YH |
527 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
528 | int optlen) | |
529 | { | |
530 | struct tcp_md5sig cmd; | |
531 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
532 | |
533 | if (optlen < sizeof(cmd)) | |
534 | return -EINVAL; | |
535 | ||
536 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
537 | return -EFAULT; | |
538 | ||
539 | if (sin6->sin6_family != AF_INET6) | |
540 | return -EINVAL; | |
541 | ||
542 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 543 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
544 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
545 | AF_INET); | |
546 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
547 | AF_INET6); | |
cfb6eeb4 YH |
548 | } |
549 | ||
550 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
551 | return -EINVAL; | |
552 | ||
a915da9b ED |
553 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
554 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
555 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 556 | |
a915da9b ED |
557 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
558 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
559 | } |
560 | ||
49a72dfb | 561 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
562 | const struct in6_addr *daddr, |
563 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 564 | { |
cfb6eeb4 | 565 | struct tcp6_pseudohdr *bp; |
49a72dfb | 566 | struct scatterlist sg; |
8d26d76d | 567 | |
cfb6eeb4 | 568 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 569 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
570 | bp->saddr = *saddr; |
571 | bp->daddr = *daddr; | |
49a72dfb | 572 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 573 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 574 | |
49a72dfb AL |
575 | sg_init_one(&sg, bp, sizeof(*bp)); |
576 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
577 | } | |
c7da57a1 | 578 | |
49a72dfb | 579 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 580 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 581 | const struct tcphdr *th) |
49a72dfb AL |
582 | { |
583 | struct tcp_md5sig_pool *hp; | |
584 | struct hash_desc *desc; | |
585 | ||
586 | hp = tcp_get_md5sig_pool(); | |
587 | if (!hp) | |
588 | goto clear_hash_noput; | |
589 | desc = &hp->md5_desc; | |
590 | ||
591 | if (crypto_hash_init(desc)) | |
592 | goto clear_hash; | |
593 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
594 | goto clear_hash; | |
595 | if (tcp_md5_hash_header(hp, th)) | |
596 | goto clear_hash; | |
597 | if (tcp_md5_hash_key(hp, key)) | |
598 | goto clear_hash; | |
599 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 600 | goto clear_hash; |
cfb6eeb4 | 601 | |
cfb6eeb4 | 602 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 603 | return 0; |
49a72dfb | 604 | |
cfb6eeb4 YH |
605 | clear_hash: |
606 | tcp_put_md5sig_pool(); | |
607 | clear_hash_noput: | |
608 | memset(md5_hash, 0, 16); | |
49a72dfb | 609 | return 1; |
cfb6eeb4 YH |
610 | } |
611 | ||
49a72dfb | 612 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
613 | const struct sock *sk, |
614 | const struct request_sock *req, | |
615 | const struct sk_buff *skb) | |
cfb6eeb4 | 616 | { |
b71d1d42 | 617 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
618 | struct tcp_md5sig_pool *hp; |
619 | struct hash_desc *desc; | |
318cf7aa | 620 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
621 | |
622 | if (sk) { | |
623 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 624 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 625 | } else if (req) { |
cfb6eeb4 YH |
626 | saddr = &inet6_rsk(req)->loc_addr; |
627 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 628 | } else { |
b71d1d42 | 629 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
630 | saddr = &ip6h->saddr; |
631 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 632 | } |
49a72dfb AL |
633 | |
634 | hp = tcp_get_md5sig_pool(); | |
635 | if (!hp) | |
636 | goto clear_hash_noput; | |
637 | desc = &hp->md5_desc; | |
638 | ||
639 | if (crypto_hash_init(desc)) | |
640 | goto clear_hash; | |
641 | ||
642 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
643 | goto clear_hash; | |
644 | if (tcp_md5_hash_header(hp, th)) | |
645 | goto clear_hash; | |
646 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
647 | goto clear_hash; | |
648 | if (tcp_md5_hash_key(hp, key)) | |
649 | goto clear_hash; | |
650 | if (crypto_hash_final(desc, md5_hash)) | |
651 | goto clear_hash; | |
652 | ||
653 | tcp_put_md5sig_pool(); | |
654 | return 0; | |
655 | ||
656 | clear_hash: | |
657 | tcp_put_md5sig_pool(); | |
658 | clear_hash_noput: | |
659 | memset(md5_hash, 0, 16); | |
660 | return 1; | |
cfb6eeb4 YH |
661 | } |
662 | ||
318cf7aa | 663 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 664 | { |
cf533ea5 | 665 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 666 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 667 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 668 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 669 | int genhash; |
cfb6eeb4 YH |
670 | u8 newhash[16]; |
671 | ||
672 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 673 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 674 | |
785957d3 DM |
675 | /* We've parsed the options - do we have a hash? */ |
676 | if (!hash_expected && !hash_location) | |
677 | return 0; | |
678 | ||
679 | if (hash_expected && !hash_location) { | |
680 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
681 | return 1; |
682 | } | |
683 | ||
785957d3 DM |
684 | if (!hash_expected && hash_location) { |
685 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
686 | return 1; |
687 | } | |
688 | ||
689 | /* check the signature */ | |
49a72dfb AL |
690 | genhash = tcp_v6_md5_hash_skb(newhash, |
691 | hash_expected, | |
692 | NULL, NULL, skb); | |
693 | ||
cfb6eeb4 | 694 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
695 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
696 | genhash ? "failed" : "mismatch", | |
697 | &ip6h->saddr, ntohs(th->source), | |
698 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
699 | return 1; |
700 | } | |
701 | return 0; | |
702 | } | |
703 | #endif | |
704 | ||
c6aefafb | 705 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 706 | .family = AF_INET6, |
2e6599cb | 707 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 708 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
709 | .send_ack = tcp_v6_reqsk_send_ack, |
710 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
711 | .send_reset = tcp_v6_send_reset, |
712 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
713 | }; |
714 | ||
cfb6eeb4 | 715 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 716 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 717 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 718 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 719 | }; |
b6332e6c | 720 | #endif |
cfb6eeb4 | 721 | |
626e264d | 722 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
ee684b6f AV |
723 | u32 tsval, u32 tsecr, |
724 | struct tcp_md5sig_key *key, int rst, u8 tclass) | |
1da177e4 | 725 | { |
cf533ea5 ED |
726 | const struct tcphdr *th = tcp_hdr(skb); |
727 | struct tcphdr *t1; | |
1da177e4 | 728 | struct sk_buff *buff; |
4c9483b2 | 729 | struct flowi6 fl6; |
adf30907 | 730 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 731 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 732 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 733 | struct dst_entry *dst; |
81ada62d | 734 | __be32 *topt; |
1da177e4 | 735 | |
ee684b6f | 736 | if (tsecr) |
626e264d | 737 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 738 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
739 | if (key) |
740 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
741 | #endif | |
742 | ||
cfb6eeb4 | 743 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 744 | GFP_ATOMIC); |
1ab1457c YH |
745 | if (buff == NULL) |
746 | return; | |
1da177e4 | 747 | |
cfb6eeb4 | 748 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 749 | |
cfb6eeb4 | 750 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 751 | skb_reset_transport_header(buff); |
1da177e4 LT |
752 | |
753 | /* Swap the send and the receive. */ | |
754 | memset(t1, 0, sizeof(*t1)); | |
755 | t1->dest = th->source; | |
756 | t1->source = th->dest; | |
cfb6eeb4 | 757 | t1->doff = tot_len / 4; |
626e264d IJ |
758 | t1->seq = htonl(seq); |
759 | t1->ack_seq = htonl(ack); | |
760 | t1->ack = !rst || !th->ack; | |
761 | t1->rst = rst; | |
762 | t1->window = htons(win); | |
1da177e4 | 763 | |
81ada62d IJ |
764 | topt = (__be32 *)(t1 + 1); |
765 | ||
ee684b6f | 766 | if (tsecr) { |
626e264d IJ |
767 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
768 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
769 | *topt++ = htonl(tsval); |
770 | *topt++ = htonl(tsecr); | |
626e264d IJ |
771 | } |
772 | ||
cfb6eeb4 YH |
773 | #ifdef CONFIG_TCP_MD5SIG |
774 | if (key) { | |
81ada62d IJ |
775 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
776 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
777 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
778 | &ipv6_hdr(skb)->saddr, |
779 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
780 | } |
781 | #endif | |
782 | ||
4c9483b2 | 783 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
784 | fl6.daddr = ipv6_hdr(skb)->saddr; |
785 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 786 | |
e5700aff DM |
787 | buff->ip_summed = CHECKSUM_PARTIAL; |
788 | buff->csum = 0; | |
789 | ||
4c9483b2 | 790 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 791 | |
4c9483b2 | 792 | fl6.flowi6_proto = IPPROTO_TCP; |
4c675258 AK |
793 | if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) |
794 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
795 | fl6.fl6_dport = t1->dest; |
796 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 797 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 798 | |
c20121ae DL |
799 | /* Pass a socket to ip6_dst_lookup either it is for RST |
800 | * Underlying function will use this to retrieve the network | |
801 | * namespace | |
802 | */ | |
4c9483b2 | 803 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
804 | if (!IS_ERR(dst)) { |
805 | skb_dst_set(buff, dst); | |
b903d324 | 806 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
807 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
808 | if (rst) | |
809 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
810 | return; | |
1da177e4 LT |
811 | } |
812 | ||
813 | kfree_skb(buff); | |
814 | } | |
815 | ||
626e264d | 816 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 817 | { |
cf533ea5 | 818 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 819 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 820 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
821 | #ifdef CONFIG_TCP_MD5SIG |
822 | const __u8 *hash_location = NULL; | |
823 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
824 | unsigned char newhash[16]; | |
825 | int genhash; | |
826 | struct sock *sk1 = NULL; | |
827 | #endif | |
1da177e4 | 828 | |
626e264d | 829 | if (th->rst) |
1da177e4 LT |
830 | return; |
831 | ||
626e264d IJ |
832 | if (!ipv6_unicast_destination(skb)) |
833 | return; | |
1da177e4 | 834 | |
cfb6eeb4 | 835 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
836 | hash_location = tcp_parse_md5sig_option(th); |
837 | if (!sk && hash_location) { | |
838 | /* | |
839 | * active side is lost. Try to find listening socket through | |
840 | * source port, and then find md5 key through listening socket. | |
841 | * we are not loose security here: | |
842 | * Incoming packet is checked with md5 hash with finding key, | |
843 | * no RST generated if md5 hash doesn't match. | |
844 | */ | |
845 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
846 | &tcp_hashinfo, &ipv6h->saddr, |
847 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
848 | ntohs(th->source), inet6_iif(skb)); |
849 | if (!sk1) | |
850 | return; | |
851 | ||
852 | rcu_read_lock(); | |
853 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
854 | if (!key) | |
855 | goto release_sk1; | |
856 | ||
857 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
858 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
859 | goto release_sk1; | |
860 | } else { | |
861 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
862 | } | |
cfb6eeb4 YH |
863 | #endif |
864 | ||
626e264d IJ |
865 | if (th->ack) |
866 | seq = ntohl(th->ack_seq); | |
867 | else | |
868 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
869 | (th->doff << 2); | |
1da177e4 | 870 | |
ee684b6f | 871 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0); |
658ddaaf SL |
872 | |
873 | #ifdef CONFIG_TCP_MD5SIG | |
874 | release_sk1: | |
875 | if (sk1) { | |
876 | rcu_read_unlock(); | |
877 | sock_put(sk1); | |
878 | } | |
879 | #endif | |
626e264d | 880 | } |
1da177e4 | 881 | |
ee684b6f AV |
882 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
883 | u32 win, u32 tsval, u32 tsecr, | |
b903d324 | 884 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 885 | { |
ee684b6f | 886 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass); |
1da177e4 LT |
887 | } |
888 | ||
889 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
890 | { | |
8feaf0c0 | 891 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 892 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 893 | |
9501f972 | 894 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 895 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 896 | tcp_time_stamp + tcptw->tw_ts_offset, |
b903d324 ED |
897 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
898 | tw->tw_tclass); | |
1da177e4 | 899 | |
8feaf0c0 | 900 | inet_twsk_put(tw); |
1da177e4 LT |
901 | } |
902 | ||
6edafaaf GJ |
903 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
904 | struct request_sock *req) | |
1da177e4 | 905 | { |
ee684b6f AV |
906 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
907 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, | |
b903d324 | 908 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
909 | } |
910 | ||
911 | ||
912 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
913 | { | |
60236fdd | 914 | struct request_sock *req, **prev; |
aa8223c7 | 915 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
916 | struct sock *nsk; |
917 | ||
918 | /* Find possible connection requests. */ | |
8129765a | 919 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
920 | &ipv6_hdr(skb)->saddr, |
921 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 922 | if (req) |
8336886f | 923 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 924 | |
3b1e0a65 | 925 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
926 | &ipv6_hdr(skb)->saddr, th->source, |
927 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
928 | |
929 | if (nsk) { | |
930 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
931 | bh_lock_sock(nsk); | |
932 | return nsk; | |
933 | } | |
9469c7b4 | 934 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
935 | return NULL; |
936 | } | |
937 | ||
c6aefafb | 938 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 939 | if (!th->syn) |
c6aefafb | 940 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
941 | #endif |
942 | return sk; | |
943 | } | |
944 | ||
1da177e4 LT |
945 | /* FIXME: this is substantially similar to the ipv4 code. |
946 | * Can some kind of merge be done? -- erics | |
947 | */ | |
948 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
949 | { | |
e6b4d113 WAS |
950 | struct tcp_options_received tmp_opt; |
951 | struct request_sock *req; | |
ca304b61 | 952 | struct inet6_request_sock *treq; |
1da177e4 | 953 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 954 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 955 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 956 | struct dst_entry *dst = NULL; |
3840a06e | 957 | struct flowi6 fl6; |
a2a385d6 | 958 | bool want_cookie = false; |
1da177e4 LT |
959 | |
960 | if (skb->protocol == htons(ETH_P_IP)) | |
961 | return tcp_v4_conn_request(sk, skb); | |
962 | ||
963 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 964 | goto drop; |
1da177e4 | 965 | |
5ad37d5d HFS |
966 | if ((sysctl_tcp_syncookies == 2 || |
967 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { | |
946cedcc ED |
968 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
969 | if (!want_cookie) | |
970 | goto drop; | |
1da177e4 LT |
971 | } |
972 | ||
5f1e942c VS |
973 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
974 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 975 | goto drop; |
5f1e942c | 976 | } |
1da177e4 | 977 | |
ca304b61 | 978 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
979 | if (req == NULL) |
980 | goto drop; | |
981 | ||
cfb6eeb4 YH |
982 | #ifdef CONFIG_TCP_MD5SIG |
983 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
984 | #endif | |
985 | ||
1da177e4 LT |
986 | tcp_clear_options(&tmp_opt); |
987 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
988 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1a2c6181 | 989 | tcp_parse_options(skb, &tmp_opt, 0, NULL); |
1da177e4 | 990 | |
4dfc2817 | 991 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 992 | tcp_clear_options(&tmp_opt); |
c6aefafb | 993 | |
1da177e4 LT |
994 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
995 | tcp_openreq_init(req, &tmp_opt, skb); | |
996 | ||
ca304b61 | 997 | treq = inet6_rsk(req); |
4e3fd7a0 AD |
998 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
999 | treq->loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1000 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1001 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1002 | |
4d0fe50c ED |
1003 | treq->iif = sk->sk_bound_dev_if; |
1004 | ||
1005 | /* So that link locals have meaning */ | |
1006 | if (!sk->sk_bound_dev_if && | |
1007 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1008 | treq->iif = inet6_iif(skb); | |
1009 | ||
2bbdf389 | 1010 | if (!isn) { |
c6aefafb GG |
1011 | if (ipv6_opt_accepted(sk, skb) || |
1012 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1013 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1014 | atomic_inc(&skb->users); | |
1015 | treq->pktopts = skb; | |
1016 | } | |
493f377d DM |
1017 | |
1018 | if (want_cookie) { | |
2bbdf389 FW |
1019 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1020 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1021 | goto have_isn; |
1022 | } | |
1023 | ||
1024 | /* VJ's idea. We save last timestamp seen | |
1025 | * from the destination in peer table, when entering | |
1026 | * state TIME-WAIT, and check against it before | |
1027 | * accepting new connection request. | |
1028 | * | |
1029 | * If "isn" is not zero, this request hit alive | |
1030 | * timewait bucket, so that all the necessary checks | |
1031 | * are made in the function processing timewait state. | |
1032 | */ | |
1033 | if (tmp_opt.saw_tstamp && | |
1034 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1035 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1036 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1037 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1038 | goto drop_and_release; | |
1039 | } | |
1040 | } | |
1041 | /* Kill the following clause, if you dislike this way. */ | |
1042 | else if (!sysctl_tcp_syncookies && | |
1043 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1044 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1045 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1046 | /* Without syncookies last quarter of |
1047 | * backlog is filled with destinations, | |
1048 | * proven to be alive. | |
1049 | * It means that we continue to communicate | |
1050 | * to destinations, already remembered | |
1051 | * to the moment of synflood. | |
1052 | */ | |
1053 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1054 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1055 | goto drop_and_release; | |
2bbdf389 | 1056 | } |
493f377d DM |
1057 | |
1058 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1059 | } |
493f377d | 1060 | have_isn: |
2e6599cb | 1061 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1062 | |
437c5b53 NC |
1063 | if (security_inet_conn_request(sk, skb, req)) |
1064 | goto drop_and_release; | |
4237c75c | 1065 | |
9f10d3f6 | 1066 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 | 1067 | skb_get_queue_mapping(skb)) || |
4957faad | 1068 | want_cookie) |
e6b4d113 | 1069 | goto drop_and_free; |
1da177e4 | 1070 | |
016818d0 | 1071 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1072 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1073 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1074 | return 0; | |
1da177e4 | 1075 | |
493f377d DM |
1076 | drop_and_release: |
1077 | dst_release(dst); | |
e6b4d113 WAS |
1078 | drop_and_free: |
1079 | reqsk_free(req); | |
1da177e4 | 1080 | drop: |
5f1e942c | 1081 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1082 | return 0; /* don't send reset */ |
1083 | } | |
1084 | ||
1085 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1086 | struct request_sock *req, |
1da177e4 LT |
1087 | struct dst_entry *dst) |
1088 | { | |
78d15e82 | 1089 | struct inet6_request_sock *treq; |
1da177e4 LT |
1090 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1091 | struct tcp6_sock *newtcp6sk; | |
1092 | struct inet_sock *newinet; | |
1093 | struct tcp_sock *newtp; | |
1094 | struct sock *newsk; | |
cfb6eeb4 YH |
1095 | #ifdef CONFIG_TCP_MD5SIG |
1096 | struct tcp_md5sig_key *key; | |
1097 | #endif | |
3840a06e | 1098 | struct flowi6 fl6; |
1da177e4 LT |
1099 | |
1100 | if (skb->protocol == htons(ETH_P_IP)) { | |
1101 | /* | |
1102 | * v6 mapped | |
1103 | */ | |
1104 | ||
1105 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1106 | ||
1ab1457c | 1107 | if (newsk == NULL) |
1da177e4 LT |
1108 | return NULL; |
1109 | ||
1110 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1111 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1112 | ||
1113 | newinet = inet_sk(newsk); | |
1114 | newnp = inet6_sk(newsk); | |
1115 | newtp = tcp_sk(newsk); | |
1116 | ||
1117 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1118 | ||
efe4208f | 1119 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1120 | |
c720c7e8 | 1121 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1122 | |
efe4208f | 1123 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1124 | |
8292a17a | 1125 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1126 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1127 | #ifdef CONFIG_TCP_MD5SIG |
1128 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1129 | #endif | |
1130 | ||
676a1184 YZ |
1131 | newnp->ipv6_ac_list = NULL; |
1132 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1133 | newnp->pktoptions = NULL; |
1134 | newnp->opt = NULL; | |
505cbfc5 | 1135 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1136 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1137 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 | 1138 | |
e6848976 ACM |
1139 | /* |
1140 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1141 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1142 | * that function for the gory details. -acme | |
1da177e4 | 1143 | */ |
1da177e4 LT |
1144 | |
1145 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1146 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1147 | Sync it now. |
1148 | */ | |
d83d8461 | 1149 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1150 | |
1151 | return newsk; | |
1152 | } | |
1153 | ||
78d15e82 | 1154 | treq = inet6_rsk(req); |
1da177e4 LT |
1155 | |
1156 | if (sk_acceptq_is_full(sk)) | |
1157 | goto out_overflow; | |
1158 | ||
493f377d | 1159 | if (!dst) { |
3840a06e | 1160 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1161 | if (!dst) |
1da177e4 | 1162 | goto out; |
1ab1457c | 1163 | } |
1da177e4 LT |
1164 | |
1165 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1166 | if (newsk == NULL) | |
093d2823 | 1167 | goto out_nonewsk; |
1da177e4 | 1168 | |
e6848976 ACM |
1169 | /* |
1170 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1171 | * count here, tcp_create_openreq_child now does this for us, see the | |
1172 | * comment in that function for the gory details. -acme | |
1173 | */ | |
1da177e4 | 1174 | |
59eed279 | 1175 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1176 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1177 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1178 | |
1179 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1180 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1181 | ||
1182 | newtp = tcp_sk(newsk); | |
1183 | newinet = inet_sk(newsk); | |
1184 | newnp = inet6_sk(newsk); | |
1185 | ||
1186 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1187 | ||
efe4208f | 1188 | newsk->sk_v6_daddr = treq->rmt_addr; |
4e3fd7a0 | 1189 | newnp->saddr = treq->loc_addr; |
efe4208f | 1190 | newsk->sk_v6_rcv_saddr = treq->loc_addr; |
2e6599cb | 1191 | newsk->sk_bound_dev_if = treq->iif; |
1da177e4 | 1192 | |
1ab1457c | 1193 | /* Now IPv6 options... |
1da177e4 LT |
1194 | |
1195 | First: no IPv4 options. | |
1196 | */ | |
f6d8bd05 | 1197 | newinet->inet_opt = NULL; |
676a1184 | 1198 | newnp->ipv6_ac_list = NULL; |
d35690be | 1199 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1200 | |
1201 | /* Clone RX bits */ | |
1202 | newnp->rxopt.all = np->rxopt.all; | |
1203 | ||
1204 | /* Clone pktoptions received with SYN */ | |
1205 | newnp->pktoptions = NULL; | |
2e6599cb | 1206 | if (treq->pktopts != NULL) { |
99a1dec7 MG |
1207 | newnp->pktoptions = skb_clone(treq->pktopts, |
1208 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
ab185d7b | 1209 | consume_skb(treq->pktopts); |
2e6599cb | 1210 | treq->pktopts = NULL; |
1da177e4 LT |
1211 | if (newnp->pktoptions) |
1212 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1213 | } | |
1214 | newnp->opt = NULL; | |
505cbfc5 | 1215 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1216 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1217 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1218 | |
1219 | /* Clone native IPv6 options from listening socket (if any) | |
1220 | ||
1221 | Yes, keeping reference count would be much more clever, | |
1222 | but we make one more one thing there: reattach optmem | |
1223 | to newsk. | |
1224 | */ | |
43264e0b RL |
1225 | if (np->opt) |
1226 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1227 | |
d83d8461 | 1228 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1229 | if (newnp->opt) |
d83d8461 ACM |
1230 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1231 | newnp->opt->opt_flen); | |
1da177e4 | 1232 | |
5d424d5a | 1233 | tcp_mtup_init(newsk); |
1da177e4 | 1234 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1235 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1236 | if (tcp_sk(sk)->rx_opt.user_mss && |
1237 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1238 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1239 | ||
1da177e4 LT |
1240 | tcp_initialize_rcv_mss(newsk); |
1241 | ||
c720c7e8 ED |
1242 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1243 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1244 | |
cfb6eeb4 YH |
1245 | #ifdef CONFIG_TCP_MD5SIG |
1246 | /* Copy over the MD5 key from the original socket */ | |
efe4208f | 1247 | if ((key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr)) != NULL) { |
cfb6eeb4 YH |
1248 | /* We're using one, so create a matching key |
1249 | * on the newsk structure. If we fail to get | |
1250 | * memory, then we end up not copying the key | |
1251 | * across. Shucks. | |
1252 | */ | |
efe4208f | 1253 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1254 | AF_INET6, key->key, key->keylen, |
1255 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1256 | } |
1257 | #endif | |
1258 | ||
093d2823 | 1259 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1260 | inet_csk_prepare_forced_close(newsk); |
1261 | tcp_done(newsk); | |
093d2823 BS |
1262 | goto out; |
1263 | } | |
9327f705 | 1264 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1265 | |
1266 | return newsk; | |
1267 | ||
1268 | out_overflow: | |
de0744af | 1269 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1270 | out_nonewsk: |
1da177e4 | 1271 | dst_release(dst); |
093d2823 BS |
1272 | out: |
1273 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1274 | return NULL; |
1275 | } | |
1276 | ||
b51655b9 | 1277 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1278 | { |
84fa7933 | 1279 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1280 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1281 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1282 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1283 | return 0; |
fb286bb2 | 1284 | } |
1da177e4 | 1285 | } |
fb286bb2 | 1286 | |
684f2176 | 1287 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1288 | &ipv6_hdr(skb)->saddr, |
1289 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1290 | |
1da177e4 | 1291 | if (skb->len <= 76) { |
fb286bb2 | 1292 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1293 | } |
1294 | return 0; | |
1295 | } | |
1296 | ||
1297 | /* The socket must have it's spinlock held when we get | |
1298 | * here. | |
1299 | * | |
1300 | * We have a potential double-lock case here, so even when | |
1301 | * doing backlog processing we use the BH locking scheme. | |
1302 | * This is because we cannot sleep with the original spinlock | |
1303 | * held. | |
1304 | */ | |
1305 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1306 | { | |
1307 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1308 | struct tcp_sock *tp; | |
1309 | struct sk_buff *opt_skb = NULL; | |
1310 | ||
1311 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1312 | goes to IPv4 receive handler and backlogged. | |
1313 | From backlog it always goes here. Kerboom... | |
1314 | Fortunately, tcp_rcv_established and rcv_established | |
1315 | handle them correctly, but it is not case with | |
1316 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1317 | */ | |
1318 | ||
1319 | if (skb->protocol == htons(ETH_P_IP)) | |
1320 | return tcp_v4_do_rcv(sk, skb); | |
1321 | ||
cfb6eeb4 YH |
1322 | #ifdef CONFIG_TCP_MD5SIG |
1323 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1324 | goto discard; | |
1325 | #endif | |
1326 | ||
fda9ef5d | 1327 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1328 | goto discard; |
1329 | ||
1330 | /* | |
1331 | * socket locking is here for SMP purposes as backlog rcv | |
1332 | * is currently called with bh processing disabled. | |
1333 | */ | |
1334 | ||
1335 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1336 | ||
1337 | Yes, guys, it is the only place in our code, where we | |
1338 | may make it not affecting IPv4. | |
1339 | The rest of code is protocol independent, | |
1340 | and I do not like idea to uglify IPv4. | |
1341 | ||
1342 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1343 | looks not very well thought. For now we latch | |
1344 | options, received in the last packet, enqueued | |
1345 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1346 | --ANK (980728) |
1da177e4 LT |
1347 | */ |
1348 | if (np->rxopt.all) | |
99a1dec7 | 1349 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1350 | |
1351 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1352 | struct dst_entry *dst = sk->sk_rx_dst; |
1353 | ||
bdeab991 | 1354 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1355 | if (dst) { |
1356 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1357 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1358 | dst_release(dst); | |
1359 | sk->sk_rx_dst = NULL; | |
1360 | } | |
1361 | } | |
1362 | ||
c995ae22 | 1363 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1364 | if (opt_skb) |
1365 | goto ipv6_pktoptions; | |
1366 | return 0; | |
1367 | } | |
1368 | ||
ab6a5bb6 | 1369 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1370 | goto csum_err; |
1371 | ||
1ab1457c | 1372 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1373 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1374 | if (!nsk) | |
1375 | goto discard; | |
1376 | ||
1377 | /* | |
1378 | * Queue it on the new socket if the new socket is active, | |
1379 | * otherwise we just shortcircuit this and continue with | |
1380 | * the new socket.. | |
1381 | */ | |
1ab1457c | 1382 | if(nsk != sk) { |
bdeab991 | 1383 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1384 | if (tcp_child_process(sk, nsk, skb)) |
1385 | goto reset; | |
1386 | if (opt_skb) | |
1387 | __kfree_skb(opt_skb); | |
1388 | return 0; | |
1389 | } | |
47482f13 | 1390 | } else |
bdeab991 | 1391 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1392 | |
aa8223c7 | 1393 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1394 | goto reset; |
1da177e4 LT |
1395 | if (opt_skb) |
1396 | goto ipv6_pktoptions; | |
1397 | return 0; | |
1398 | ||
1399 | reset: | |
cfb6eeb4 | 1400 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1401 | discard: |
1402 | if (opt_skb) | |
1403 | __kfree_skb(opt_skb); | |
1404 | kfree_skb(skb); | |
1405 | return 0; | |
1406 | csum_err: | |
6a5dc9e5 | 1407 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1408 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1409 | goto discard; |
1410 | ||
1411 | ||
1412 | ipv6_pktoptions: | |
1413 | /* Do you ask, what is it? | |
1414 | ||
1415 | 1. skb was enqueued by tcp. | |
1416 | 2. skb is added to tail of read queue, rather than out of order. | |
1417 | 3. socket is not in passive state. | |
1418 | 4. Finally, it really contains options, which user wants to receive. | |
1419 | */ | |
1420 | tp = tcp_sk(sk); | |
1421 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1422 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1423 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1424 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1425 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1426 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
4c507d28 | 1427 | if (np->rxopt.bits.rxtclass) |
3a1c7565 | 1428 | np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb)); |
1da177e4 LT |
1429 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1430 | skb_set_owner_r(opt_skb, sk); | |
1431 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1432 | } else { | |
1433 | __kfree_skb(opt_skb); | |
1434 | opt_skb = xchg(&np->pktoptions, NULL); | |
1435 | } | |
1436 | } | |
1437 | ||
800d55f1 | 1438 | kfree_skb(opt_skb); |
1da177e4 LT |
1439 | return 0; |
1440 | } | |
1441 | ||
e5bbef20 | 1442 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1443 | { |
cf533ea5 | 1444 | const struct tcphdr *th; |
b71d1d42 | 1445 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1446 | struct sock *sk; |
1447 | int ret; | |
a86b1e30 | 1448 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1449 | |
1450 | if (skb->pkt_type != PACKET_HOST) | |
1451 | goto discard_it; | |
1452 | ||
1453 | /* | |
1454 | * Count it even if it's bad. | |
1455 | */ | |
63231bdd | 1456 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1457 | |
1458 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1459 | goto discard_it; | |
1460 | ||
aa8223c7 | 1461 | th = tcp_hdr(skb); |
1da177e4 LT |
1462 | |
1463 | if (th->doff < sizeof(struct tcphdr)/4) | |
1464 | goto bad_packet; | |
1465 | if (!pskb_may_pull(skb, th->doff*4)) | |
1466 | goto discard_it; | |
1467 | ||
60476372 | 1468 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
6a5dc9e5 | 1469 | goto csum_error; |
1da177e4 | 1470 | |
aa8223c7 | 1471 | th = tcp_hdr(skb); |
e802af9c | 1472 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1473 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1474 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1475 | skb->len - th->doff*4); | |
1476 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1477 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1478 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1479 | TCP_SKB_CB(skb)->sacked = 0; |
1480 | ||
9a1f27c4 | 1481 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1482 | if (!sk) |
1483 | goto no_tcp_socket; | |
1484 | ||
1485 | process: | |
1486 | if (sk->sk_state == TCP_TIME_WAIT) | |
1487 | goto do_time_wait; | |
1488 | ||
e802af9c SH |
1489 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1490 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1491 | goto discard_and_relse; | |
1492 | } | |
1493 | ||
1da177e4 LT |
1494 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1495 | goto discard_and_relse; | |
1496 | ||
fda9ef5d | 1497 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1498 | goto discard_and_relse; |
1499 | ||
8b80cda5 | 1500 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1501 | skb->dev = NULL; |
1502 | ||
293b9c42 | 1503 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1504 | ret = 0; |
1505 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1506 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1507 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1508 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1509 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1510 | if (tp->ucopy.dma_chan) |
1511 | ret = tcp_v6_do_rcv(sk, skb); | |
1512 | else | |
1a2449a8 CL |
1513 | #endif |
1514 | { | |
1515 | if (!tcp_prequeue(sk, skb)) | |
1516 | ret = tcp_v6_do_rcv(sk, skb); | |
1517 | } | |
da882c1f ED |
1518 | } else if (unlikely(sk_add_backlog(sk, skb, |
1519 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1520 | bh_unlock_sock(sk); |
6cce09f8 | 1521 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1522 | goto discard_and_relse; |
1523 | } | |
1da177e4 LT |
1524 | bh_unlock_sock(sk); |
1525 | ||
1526 | sock_put(sk); | |
1527 | return ret ? -1 : 0; | |
1528 | ||
1529 | no_tcp_socket: | |
1530 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1531 | goto discard_it; | |
1532 | ||
1533 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1534 | csum_error: |
1535 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1536 | bad_packet: |
63231bdd | 1537 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1538 | } else { |
cfb6eeb4 | 1539 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1540 | } |
1541 | ||
1542 | discard_it: | |
1da177e4 LT |
1543 | kfree_skb(skb); |
1544 | return 0; | |
1545 | ||
1546 | discard_and_relse: | |
1547 | sock_put(sk); | |
1548 | goto discard_it; | |
1549 | ||
1550 | do_time_wait: | |
1551 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1552 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1553 | goto discard_it; |
1554 | } | |
1555 | ||
6a5dc9e5 | 1556 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1557 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1558 | goto bad_packet; |
1559 | } | |
1560 | if (tcp_checksum_complete(skb)) { | |
1561 | inet_twsk_put(inet_twsk(sk)); | |
1562 | goto csum_error; | |
1da177e4 LT |
1563 | } |
1564 | ||
9469c7b4 | 1565 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1566 | case TCP_TW_SYN: |
1567 | { | |
1568 | struct sock *sk2; | |
1569 | ||
c346dca1 | 1570 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1571 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1572 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1573 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1574 | if (sk2 != NULL) { |
295ff7ed ACM |
1575 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1576 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1577 | inet_twsk_put(tw); | |
1da177e4 LT |
1578 | sk = sk2; |
1579 | goto process; | |
1580 | } | |
1581 | /* Fall through to ACK */ | |
1582 | } | |
1583 | case TCP_TW_ACK: | |
1584 | tcp_v6_timewait_ack(sk, skb); | |
1585 | break; | |
1586 | case TCP_TW_RST: | |
1587 | goto no_tcp_socket; | |
1588 | case TCP_TW_SUCCESS:; | |
1589 | } | |
1590 | goto discard_it; | |
1591 | } | |
1592 | ||
c7109986 ED |
1593 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1594 | { | |
1595 | const struct ipv6hdr *hdr; | |
1596 | const struct tcphdr *th; | |
1597 | struct sock *sk; | |
1598 | ||
1599 | if (skb->pkt_type != PACKET_HOST) | |
1600 | return; | |
1601 | ||
1602 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1603 | return; | |
1604 | ||
1605 | hdr = ipv6_hdr(skb); | |
1606 | th = tcp_hdr(skb); | |
1607 | ||
1608 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1609 | return; | |
1610 | ||
1611 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1612 | &hdr->saddr, th->source, | |
1613 | &hdr->daddr, ntohs(th->dest), | |
1614 | inet6_iif(skb)); | |
1615 | if (sk) { | |
1616 | skb->sk = sk; | |
1617 | skb->destructor = sock_edemux; | |
1618 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1619 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1620 | |
c7109986 | 1621 | if (dst) |
5d299f3d | 1622 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1623 | if (dst && |
f3f12135 | 1624 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1625 | skb_dst_set_noref(skb, dst); |
1626 | } | |
1627 | } | |
1628 | } | |
1629 | ||
ccb7c410 DM |
1630 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1631 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1632 | .twsk_unique = tcp_twsk_unique, | |
1633 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1634 | }; |
1635 | ||
3b401a81 | 1636 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1637 | .queue_xmit = inet6_csk_xmit, |
1638 | .send_check = tcp_v6_send_check, | |
1639 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1640 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1641 | .conn_request = tcp_v6_conn_request, |
1642 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1643 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1644 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1645 | .setsockopt = ipv6_setsockopt, |
1646 | .getsockopt = ipv6_getsockopt, | |
1647 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1648 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1649 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1650 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1651 | .compat_setsockopt = compat_ipv6_setsockopt, |
1652 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1653 | #endif |
1da177e4 LT |
1654 | }; |
1655 | ||
cfb6eeb4 | 1656 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1657 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1658 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1659 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1660 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1661 | }; |
a928630a | 1662 | #endif |
cfb6eeb4 | 1663 | |
1da177e4 LT |
1664 | /* |
1665 | * TCP over IPv4 via INET6 API | |
1666 | */ | |
1667 | ||
3b401a81 | 1668 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1669 | .queue_xmit = ip_queue_xmit, |
1670 | .send_check = tcp_v4_send_check, | |
1671 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1672 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1673 | .conn_request = tcp_v6_conn_request, |
1674 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1675 | .net_header_len = sizeof(struct iphdr), |
1676 | .setsockopt = ipv6_setsockopt, | |
1677 | .getsockopt = ipv6_getsockopt, | |
1678 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1679 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1680 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1681 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1682 | .compat_setsockopt = compat_ipv6_setsockopt, |
1683 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1684 | #endif |
1da177e4 LT |
1685 | }; |
1686 | ||
cfb6eeb4 | 1687 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1688 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1689 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1690 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1691 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1692 | }; |
a928630a | 1693 | #endif |
cfb6eeb4 | 1694 | |
1da177e4 LT |
1695 | /* NOTE: A lot of things set to zero explicitly by call to |
1696 | * sk_alloc() so need not be done here. | |
1697 | */ | |
1698 | static int tcp_v6_init_sock(struct sock *sk) | |
1699 | { | |
6687e988 | 1700 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1701 | |
900f65d3 | 1702 | tcp_init_sock(sk); |
1da177e4 | 1703 | |
8292a17a | 1704 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1705 | |
cfb6eeb4 | 1706 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1707 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1708 | #endif |
1709 | ||
1da177e4 LT |
1710 | return 0; |
1711 | } | |
1712 | ||
7d06b2e0 | 1713 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1714 | { |
1da177e4 | 1715 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1716 | inet6_destroy_sock(sk); |
1da177e4 LT |
1717 | } |
1718 | ||
952a10be | 1719 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1720 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1721 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1722 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1723 | { |
1da177e4 | 1724 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
1725 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1726 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1727 | |
1728 | if (ttd < 0) | |
1729 | ttd = 0; | |
1730 | ||
1da177e4 LT |
1731 | seq_printf(seq, |
1732 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1733 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1734 | i, |
1735 | src->s6_addr32[0], src->s6_addr32[1], | |
1736 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1737 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1738 | dest->s6_addr32[0], dest->s6_addr32[1], |
1739 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1740 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1741 | TCP_SYN_RECV, |
1742 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1743 | 1, /* timers active (only the expire timer) */ |
1744 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1745 | req->num_timeout, |
a7cb5a49 | 1746 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1747 | 0, /* non standard timer */ |
1da177e4 LT |
1748 | 0, /* open_requests have no inode */ |
1749 | 0, req); | |
1750 | } | |
1751 | ||
1752 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1753 | { | |
b71d1d42 | 1754 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1755 | __u16 destp, srcp; |
1756 | int timer_active; | |
1757 | unsigned long timer_expires; | |
cf533ea5 ED |
1758 | const struct inet_sock *inet = inet_sk(sp); |
1759 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1760 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 | 1761 | |
efe4208f ED |
1762 | dest = &sp->sk_v6_daddr; |
1763 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1764 | destp = ntohs(inet->inet_dport); |
1765 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1766 | |
1767 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1768 | timer_active = 1; |
463c84b9 ACM |
1769 | timer_expires = icsk->icsk_timeout; |
1770 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1771 | timer_active = 4; |
463c84b9 | 1772 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1773 | } else if (timer_pending(&sp->sk_timer)) { |
1774 | timer_active = 2; | |
1775 | timer_expires = sp->sk_timer.expires; | |
1776 | } else { | |
1777 | timer_active = 0; | |
1778 | timer_expires = jiffies; | |
1779 | } | |
1780 | ||
1781 | seq_printf(seq, | |
1782 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1783 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1784 | i, |
1785 | src->s6_addr32[0], src->s6_addr32[1], | |
1786 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1787 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1788 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1789 | sp->sk_state, |
47da8ee6 SS |
1790 | tp->write_seq-tp->snd_una, |
1791 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1792 | timer_active, |
a399a805 | 1793 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1794 | icsk->icsk_retransmits, |
a7cb5a49 | 1795 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1796 | icsk->icsk_probes_out, |
1da177e4 LT |
1797 | sock_i_ino(sp), |
1798 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1799 | jiffies_to_clock_t(icsk->icsk_rto), |
1800 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1801 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1802 | tp->snd_cwnd, |
1803 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1804 | ); |
1805 | } | |
1806 | ||
1ab1457c | 1807 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1808 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1809 | { |
b71d1d42 | 1810 | const struct in6_addr *dest, *src; |
1da177e4 | 1811 | __u16 destp, srcp; |
96f817fe | 1812 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1813 | |
efe4208f ED |
1814 | dest = &tw->tw_v6_daddr; |
1815 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1816 | destp = ntohs(tw->tw_dport); |
1817 | srcp = ntohs(tw->tw_sport); | |
1818 | ||
1819 | seq_printf(seq, | |
1820 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1821 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1822 | i, |
1823 | src->s6_addr32[0], src->s6_addr32[1], | |
1824 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1825 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1826 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1827 | tw->tw_substate, 0, 0, | |
a399a805 | 1828 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1829 | atomic_read(&tw->tw_refcnt), tw); |
1830 | } | |
1831 | ||
1da177e4 LT |
1832 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1833 | { | |
1834 | struct tcp_iter_state *st; | |
05dbc7b5 | 1835 | struct sock *sk = v; |
1da177e4 LT |
1836 | |
1837 | if (v == SEQ_START_TOKEN) { | |
1838 | seq_puts(seq, | |
1839 | " sl " | |
1840 | "local_address " | |
1841 | "remote_address " | |
1842 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1843 | " uid timeout inode\n"); | |
1844 | goto out; | |
1845 | } | |
1846 | st = seq->private; | |
1847 | ||
1848 | switch (st->state) { | |
1849 | case TCP_SEQ_STATE_LISTENING: | |
1850 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1851 | if (sk->sk_state == TCP_TIME_WAIT) |
1852 | get_timewait6_sock(seq, v, st->num); | |
1853 | else | |
1854 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1855 | break; |
1856 | case TCP_SEQ_STATE_OPENREQ: | |
1857 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1858 | break; | |
1da177e4 LT |
1859 | } |
1860 | out: | |
1861 | return 0; | |
1862 | } | |
1863 | ||
73cb88ec AV |
1864 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1865 | .owner = THIS_MODULE, | |
1866 | .open = tcp_seq_open, | |
1867 | .read = seq_read, | |
1868 | .llseek = seq_lseek, | |
1869 | .release = seq_release_net | |
1870 | }; | |
1871 | ||
1da177e4 | 1872 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1873 | .name = "tcp6", |
1874 | .family = AF_INET6, | |
73cb88ec | 1875 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1876 | .seq_ops = { |
1877 | .show = tcp6_seq_show, | |
1878 | }, | |
1da177e4 LT |
1879 | }; |
1880 | ||
2c8c1e72 | 1881 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1882 | { |
6f8b13bc | 1883 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1884 | } |
1885 | ||
6f8b13bc | 1886 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1887 | { |
6f8b13bc | 1888 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1889 | } |
1890 | #endif | |
1891 | ||
f77d6021 ED |
1892 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1893 | { | |
1894 | struct inet_sock *inet = inet_sk(sk); | |
1895 | ||
1896 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1897 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1898 | ||
1899 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1900 | memset(&inet->pinet6 + 1, 0, size); | |
1901 | } | |
1902 | ||
1da177e4 LT |
1903 | struct proto tcpv6_prot = { |
1904 | .name = "TCPv6", | |
1905 | .owner = THIS_MODULE, | |
1906 | .close = tcp_close, | |
1907 | .connect = tcp_v6_connect, | |
1908 | .disconnect = tcp_disconnect, | |
463c84b9 | 1909 | .accept = inet_csk_accept, |
1da177e4 LT |
1910 | .ioctl = tcp_ioctl, |
1911 | .init = tcp_v6_init_sock, | |
1912 | .destroy = tcp_v6_destroy_sock, | |
1913 | .shutdown = tcp_shutdown, | |
1914 | .setsockopt = tcp_setsockopt, | |
1915 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1916 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1917 | .sendmsg = tcp_sendmsg, |
1918 | .sendpage = tcp_sendpage, | |
1da177e4 | 1919 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1920 | .release_cb = tcp_release_cb, |
563d34d0 | 1921 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 1922 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1923 | .unhash = inet_unhash, |
1924 | .get_port = inet_csk_get_port, | |
1da177e4 | 1925 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1926 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1927 | .sockets_allocated = &tcp_sockets_allocated, |
1928 | .memory_allocated = &tcp_memory_allocated, | |
1929 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1930 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1931 | .sysctl_wmem = sysctl_tcp_wmem, |
1932 | .sysctl_rmem = sysctl_tcp_rmem, | |
1933 | .max_header = MAX_TCP_HEADER, | |
1934 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1935 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1936 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1937 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1938 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1939 | .no_autobind = true, |
543d9cfe ACM |
1940 | #ifdef CONFIG_COMPAT |
1941 | .compat_setsockopt = compat_tcp_setsockopt, | |
1942 | .compat_getsockopt = compat_tcp_getsockopt, | |
1943 | #endif | |
c255a458 | 1944 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1945 | .proto_cgroup = tcp_proto_cgroup, |
1946 | #endif | |
f77d6021 | 1947 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1948 | }; |
1949 | ||
41135cc8 | 1950 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1951 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1952 | .handler = tcp_v6_rcv, |
1953 | .err_handler = tcp_v6_err, | |
1954 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1955 | }; | |
1956 | ||
1da177e4 LT |
1957 | static struct inet_protosw tcpv6_protosw = { |
1958 | .type = SOCK_STREAM, | |
1959 | .protocol = IPPROTO_TCP, | |
1960 | .prot = &tcpv6_prot, | |
1961 | .ops = &inet6_stream_ops, | |
1da177e4 | 1962 | .no_check = 0, |
d83d8461 ACM |
1963 | .flags = INET_PROTOSW_PERMANENT | |
1964 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1965 | }; |
1966 | ||
2c8c1e72 | 1967 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1968 | { |
5677242f DL |
1969 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1970 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1971 | } |
1972 | ||
2c8c1e72 | 1973 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1974 | { |
5677242f | 1975 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1976 | } |
1977 | ||
2c8c1e72 | 1978 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1979 | { |
1980 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1981 | } |
1982 | ||
1983 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1984 | .init = tcpv6_net_init, |
1985 | .exit = tcpv6_net_exit, | |
1986 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1987 | }; |
1988 | ||
7f4e4868 | 1989 | int __init tcpv6_init(void) |
1da177e4 | 1990 | { |
7f4e4868 DL |
1991 | int ret; |
1992 | ||
3336288a VY |
1993 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1994 | if (ret) | |
c6b641a4 | 1995 | goto out; |
3336288a | 1996 | |
1da177e4 | 1997 | /* register inet6 protocol */ |
7f4e4868 DL |
1998 | ret = inet6_register_protosw(&tcpv6_protosw); |
1999 | if (ret) | |
2000 | goto out_tcpv6_protocol; | |
2001 | ||
93ec926b | 2002 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2003 | if (ret) |
2004 | goto out_tcpv6_protosw; | |
2005 | out: | |
2006 | return ret; | |
ae0f7d5f | 2007 | |
7f4e4868 DL |
2008 | out_tcpv6_protosw: |
2009 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2010 | out_tcpv6_protocol: |
2011 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2012 | goto out; |
2013 | } | |
2014 | ||
09f7709f | 2015 | void tcpv6_exit(void) |
7f4e4868 | 2016 | { |
93ec926b | 2017 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2018 | inet6_unregister_protosw(&tcpv6_protosw); |
2019 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2020 | } |