Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TCP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1ab1457c | 8 | * Based on: |
1da177e4 LT |
9 | * linux/net/ipv4/tcp.c |
10 | * linux/net/ipv4/tcp_input.c | |
11 | * linux/net/ipv4/tcp_output.c | |
12 | * | |
13 | * Fixes: | |
14 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
15 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
16 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
17 | * a single port at the same time. | |
18 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. | |
19 | * | |
20 | * This program is free software; you can redistribute it and/or | |
21 | * modify it under the terms of the GNU General Public License | |
22 | * as published by the Free Software Foundation; either version | |
23 | * 2 of the License, or (at your option) any later version. | |
24 | */ | |
25 | ||
eb4dea58 | 26 | #include <linux/bottom_half.h> |
1da177e4 | 27 | #include <linux/module.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/in6.h> | |
36 | #include <linux/netdevice.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/jhash.h> | |
39 | #include <linux/ipsec.h> | |
40 | #include <linux/times.h> | |
5a0e3ad6 | 41 | #include <linux/slab.h> |
4aa956d8 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
6e5714ea | 64 | #include <net/secure_seq.h> |
d1a4c0b3 | 65 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 66 | #include <net/busy_poll.h> |
1da177e4 | 67 | |
1da177e4 LT |
68 | #include <linux/proc_fs.h> |
69 | #include <linux/seq_file.h> | |
70 | ||
cfb6eeb4 YH |
71 | #include <linux/crypto.h> |
72 | #include <linux/scatterlist.h> | |
73 | ||
cfb6eeb4 | 74 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
75 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
76 | struct request_sock *req); | |
1da177e4 LT |
77 | |
78 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 79 | |
3b401a81 SH |
80 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
81 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 82 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
83 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
85 | #else |
86 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 87 | const struct in6_addr *addr) |
9501f972 YH |
88 | { |
89 | return NULL; | |
90 | } | |
a928630a | 91 | #endif |
1da177e4 | 92 | |
fae6ef87 NC |
93 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
94 | { | |
95 | struct dst_entry *dst = skb_dst(skb); | |
96 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
97 | ||
98 | dst_hold(dst); | |
99 | sk->sk_rx_dst = dst; | |
100 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
101 | if (rt->rt6i_node) | |
102 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
103 | } | |
104 | ||
1da177e4 LT |
105 | static void tcp_v6_hash(struct sock *sk) |
106 | { | |
107 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 108 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
109 | tcp_prot.hash(sk); |
110 | return; | |
111 | } | |
112 | local_bh_disable(); | |
9327f705 | 113 | __inet6_hash(sk, NULL); |
1da177e4 LT |
114 | local_bh_enable(); |
115 | } | |
116 | } | |
117 | ||
cf533ea5 | 118 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 119 | { |
0660e03f ACM |
120 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
121 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
122 | tcp_hdr(skb)->dest, |
123 | tcp_hdr(skb)->source); | |
1da177e4 LT |
124 | } |
125 | ||
1ab1457c | 126 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
127 | int addr_len) |
128 | { | |
129 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 130 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 131 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
132 | struct ipv6_pinfo *np = inet6_sk(sk); |
133 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 134 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 135 | struct rt6_info *rt; |
4c9483b2 | 136 | struct flowi6 fl6; |
1da177e4 LT |
137 | struct dst_entry *dst; |
138 | int addr_type; | |
139 | int err; | |
140 | ||
1ab1457c | 141 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
142 | return -EINVAL; |
143 | ||
1ab1457c | 144 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 145 | return -EAFNOSUPPORT; |
1da177e4 | 146 | |
4c9483b2 | 147 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
148 | |
149 | if (np->sndflow) { | |
4c9483b2 DM |
150 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
151 | IP6_ECN_flow_init(fl6.flowlabel); | |
152 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 153 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 154 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
155 | if (flowlabel == NULL) |
156 | return -EINVAL; | |
1da177e4 LT |
157 | fl6_sock_release(flowlabel); |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
1ab1457c YH |
162 | * connect() to INADDR_ANY means loopback (BSD'ism). |
163 | */ | |
164 | ||
4c99aa40 | 165 | if (ipv6_addr_any(&usin->sin6_addr)) |
1ab1457c | 166 | usin->sin6_addr.s6_addr[15] = 0x1; |
1da177e4 LT |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
169 | ||
4c99aa40 | 170 | if (addr_type & IPV6_ADDR_MULTICAST) |
1da177e4 LT |
171 | return -ENETUNREACH; |
172 | ||
173 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
174 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
175 | usin->sin6_scope_id) { | |
176 | /* If interface is set while binding, indices | |
177 | * must coincide. | |
178 | */ | |
179 | if (sk->sk_bound_dev_if && | |
180 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
181 | return -EINVAL; | |
182 | ||
183 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
184 | } | |
185 | ||
186 | /* Connect to link-local address requires an interface */ | |
187 | if (!sk->sk_bound_dev_if) | |
188 | return -EINVAL; | |
189 | } | |
190 | ||
191 | if (tp->rx_opt.ts_recent_stamp && | |
efe4208f | 192 | !ipv6_addr_equal(&sk->sk_v6_daddr, &usin->sin6_addr)) { |
1da177e4 LT |
193 | tp->rx_opt.ts_recent = 0; |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
efe4208f | 198 | sk->sk_v6_daddr = usin->sin6_addr; |
4c9483b2 | 199 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
200 | |
201 | /* | |
202 | * TCP over IPv4 | |
203 | */ | |
204 | ||
205 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 206 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
207 | struct sockaddr_in sin; |
208 | ||
209 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
210 | ||
211 | if (__ipv6_only_sock(sk)) | |
212 | return -ENETUNREACH; | |
213 | ||
214 | sin.sin_family = AF_INET; | |
215 | sin.sin_port = usin->sin6_port; | |
216 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
217 | ||
d83d8461 | 218 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 219 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
220 | #ifdef CONFIG_TCP_MD5SIG |
221 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
222 | #endif | |
1da177e4 LT |
223 | |
224 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
225 | ||
226 | if (err) { | |
d83d8461 ACM |
227 | icsk->icsk_ext_hdr_len = exthdrlen; |
228 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 229 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
230 | #ifdef CONFIG_TCP_MD5SIG |
231 | tp->af_specific = &tcp_sock_ipv6_specific; | |
232 | #endif | |
1da177e4 LT |
233 | goto failure; |
234 | } else { | |
c720c7e8 ED |
235 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
236 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
efe4208f | 237 | &sk->sk_v6_rcv_saddr); |
1da177e4 LT |
238 | } |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
efe4208f ED |
243 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
244 | saddr = &sk->sk_v6_rcv_saddr; | |
1da177e4 | 245 | |
4c9483b2 | 246 | fl6.flowi6_proto = IPPROTO_TCP; |
efe4208f | 247 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 248 | fl6.saddr = saddr ? *saddr : np->saddr; |
4c9483b2 DM |
249 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
250 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
251 | fl6.fl6_dport = usin->sin6_port; |
252 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 253 | |
4c9483b2 | 254 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 255 | |
4c9483b2 | 256 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 257 | |
0e0d44ab | 258 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
259 | if (IS_ERR(dst)) { |
260 | err = PTR_ERR(dst); | |
1da177e4 | 261 | goto failure; |
14e50e57 | 262 | } |
1da177e4 LT |
263 | |
264 | if (saddr == NULL) { | |
4c9483b2 | 265 | saddr = &fl6.saddr; |
efe4208f | 266 | sk->sk_v6_rcv_saddr = *saddr; |
1da177e4 LT |
267 | } |
268 | ||
269 | /* set the source address */ | |
4e3fd7a0 | 270 | np->saddr = *saddr; |
c720c7e8 | 271 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 272 | |
f83ef8c0 | 273 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 274 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 275 | |
493f377d DM |
276 | rt = (struct rt6_info *) dst; |
277 | if (tcp_death_row.sysctl_tw_recycle && | |
278 | !tp->rx_opt.ts_recent_stamp && | |
efe4208f | 279 | ipv6_addr_equal(&rt->rt6i_dst.addr, &sk->sk_v6_daddr)) |
81166dd6 | 280 | tcp_fetch_timewait_stamp(sk, dst); |
493f377d | 281 | |
d83d8461 | 282 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 283 | if (np->opt) |
d83d8461 ACM |
284 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
285 | np->opt->opt_nflen); | |
1da177e4 LT |
286 | |
287 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
288 | ||
c720c7e8 | 289 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
290 | |
291 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 292 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
293 | if (err) |
294 | goto late_failure; | |
295 | ||
2b916477 | 296 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 | 297 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
efe4208f | 298 | sk->sk_v6_daddr.s6_addr32, |
c720c7e8 ED |
299 | inet->inet_sport, |
300 | inet->inet_dport); | |
1da177e4 LT |
301 | |
302 | err = tcp_connect(sk); | |
303 | if (err) | |
304 | goto late_failure; | |
305 | ||
306 | return 0; | |
307 | ||
308 | late_failure: | |
309 | tcp_set_state(sk, TCP_CLOSE); | |
310 | __sk_dst_reset(sk); | |
311 | failure: | |
c720c7e8 | 312 | inet->inet_dport = 0; |
1da177e4 LT |
313 | sk->sk_route_caps = 0; |
314 | return err; | |
315 | } | |
316 | ||
563d34d0 ED |
317 | static void tcp_v6_mtu_reduced(struct sock *sk) |
318 | { | |
319 | struct dst_entry *dst; | |
320 | ||
321 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
322 | return; | |
323 | ||
324 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
325 | if (!dst) | |
326 | return; | |
327 | ||
328 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
329 | tcp_sync_mss(sk, dst_mtu(dst)); | |
330 | tcp_simple_retransmit(sk); | |
331 | } | |
332 | } | |
333 | ||
1da177e4 | 334 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 335 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 336 | { |
4c99aa40 | 337 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
505cbfc5 | 338 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
339 | struct ipv6_pinfo *np; |
340 | struct sock *sk; | |
341 | int err; | |
1ab1457c | 342 | struct tcp_sock *tp; |
1da177e4 | 343 | __u32 seq; |
ca12a1a4 | 344 | struct net *net = dev_net(skb->dev); |
1da177e4 | 345 | |
ca12a1a4 | 346 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 347 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
348 | |
349 | if (sk == NULL) { | |
e41b5368 DL |
350 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
351 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
352 | return; |
353 | } | |
354 | ||
355 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 356 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
357 | return; |
358 | } | |
359 | ||
360 | bh_lock_sock(sk); | |
563d34d0 | 361 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 362 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
363 | |
364 | if (sk->sk_state == TCP_CLOSE) | |
365 | goto out; | |
366 | ||
e802af9c SH |
367 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
368 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
369 | goto out; | |
370 | } | |
371 | ||
1da177e4 | 372 | tp = tcp_sk(sk); |
1ab1457c | 373 | seq = ntohl(th->seq); |
1da177e4 LT |
374 | if (sk->sk_state != TCP_LISTEN && |
375 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 376 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
377 | goto out; |
378 | } | |
379 | ||
380 | np = inet6_sk(sk); | |
381 | ||
ec18d9a2 DM |
382 | if (type == NDISC_REDIRECT) { |
383 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
384 | ||
1ed5c48f | 385 | if (dst) |
6700c270 | 386 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 387 | goto out; |
ec18d9a2 DM |
388 | } |
389 | ||
1da177e4 | 390 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
391 | /* We are not interested in TCP_LISTEN and open_requests |
392 | * (SYN-ACKs send out by Linux are always <576bytes so | |
393 | * they should go through unfragmented). | |
394 | */ | |
395 | if (sk->sk_state == TCP_LISTEN) | |
396 | goto out; | |
397 | ||
93b36cf3 HFS |
398 | if (!ip6_sk_accept_pmtu(sk)) |
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 | { |
634fb979 | 468 | struct inet_request_sock *ireq = inet_rsk(req); |
1da177e4 | 469 | struct ipv6_pinfo *np = inet6_sk(sk); |
4c99aa40 | 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) { |
634fb979 ED |
480 | __tcp_v6_send_check(skb, &ireq->ir_v6_loc_addr, |
481 | &ireq->ir_v6_rmt_addr); | |
1da177e4 | 482 | |
634fb979 | 483 | fl6->daddr = ireq->ir_v6_rmt_addr; |
df3687ff FF |
484 | if (np->repflow && (ireq->pktopts != NULL)) |
485 | fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts)); | |
486 | ||
fff32699 | 487 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 488 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 489 | err = net_xmit_eval(err); |
1da177e4 LT |
490 | } |
491 | ||
492 | done: | |
1da177e4 LT |
493 | return err; |
494 | } | |
495 | ||
1a2c6181 | 496 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
72659ecc | 497 | { |
9f10d3f6 | 498 | struct flowi6 fl6; |
e6c022a4 | 499 | int res; |
9f10d3f6 | 500 | |
1a2c6181 | 501 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); |
f19c29e3 | 502 | if (!res) { |
e6c022a4 | 503 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); |
f19c29e3 YC |
504 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPSYNRETRANS); |
505 | } | |
e6c022a4 | 506 | return res; |
72659ecc OP |
507 | } |
508 | ||
60236fdd | 509 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 510 | { |
634fb979 | 511 | kfree_skb(inet_rsk(req)->pktopts); |
1da177e4 LT |
512 | } |
513 | ||
cfb6eeb4 YH |
514 | #ifdef CONFIG_TCP_MD5SIG |
515 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 516 | const struct in6_addr *addr) |
cfb6eeb4 | 517 | { |
a915da9b | 518 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
519 | } |
520 | ||
521 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
522 | struct sock *addr_sk) | |
523 | { | |
efe4208f | 524 | return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr); |
cfb6eeb4 YH |
525 | } |
526 | ||
527 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
528 | struct request_sock *req) | |
529 | { | |
634fb979 | 530 | return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr); |
cfb6eeb4 YH |
531 | } |
532 | ||
4aa956d8 WY |
533 | static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval, |
534 | int optlen) | |
cfb6eeb4 YH |
535 | { |
536 | struct tcp_md5sig cmd; | |
537 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
538 | |
539 | if (optlen < sizeof(cmd)) | |
540 | return -EINVAL; | |
541 | ||
542 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
543 | return -EFAULT; | |
544 | ||
545 | if (sin6->sin6_family != AF_INET6) | |
546 | return -EINVAL; | |
547 | ||
548 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 549 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
550 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
551 | AF_INET); | |
552 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
553 | AF_INET6); | |
cfb6eeb4 YH |
554 | } |
555 | ||
556 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
557 | return -EINVAL; | |
558 | ||
a915da9b ED |
559 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
560 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
561 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 562 | |
a915da9b ED |
563 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
564 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
565 | } |
566 | ||
49a72dfb | 567 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
568 | const struct in6_addr *daddr, |
569 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 570 | { |
cfb6eeb4 | 571 | struct tcp6_pseudohdr *bp; |
49a72dfb | 572 | struct scatterlist sg; |
8d26d76d | 573 | |
cfb6eeb4 | 574 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 575 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
576 | bp->saddr = *saddr; |
577 | bp->daddr = *daddr; | |
49a72dfb | 578 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 579 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 580 | |
49a72dfb AL |
581 | sg_init_one(&sg, bp, sizeof(*bp)); |
582 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
583 | } | |
c7da57a1 | 584 | |
49a72dfb | 585 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 586 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 587 | const struct tcphdr *th) |
49a72dfb AL |
588 | { |
589 | struct tcp_md5sig_pool *hp; | |
590 | struct hash_desc *desc; | |
591 | ||
592 | hp = tcp_get_md5sig_pool(); | |
593 | if (!hp) | |
594 | goto clear_hash_noput; | |
595 | desc = &hp->md5_desc; | |
596 | ||
597 | if (crypto_hash_init(desc)) | |
598 | goto clear_hash; | |
599 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
600 | goto clear_hash; | |
601 | if (tcp_md5_hash_header(hp, th)) | |
602 | goto clear_hash; | |
603 | if (tcp_md5_hash_key(hp, key)) | |
604 | goto clear_hash; | |
605 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 606 | goto clear_hash; |
cfb6eeb4 | 607 | |
cfb6eeb4 | 608 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 609 | return 0; |
49a72dfb | 610 | |
cfb6eeb4 YH |
611 | clear_hash: |
612 | tcp_put_md5sig_pool(); | |
613 | clear_hash_noput: | |
614 | memset(md5_hash, 0, 16); | |
49a72dfb | 615 | return 1; |
cfb6eeb4 YH |
616 | } |
617 | ||
49a72dfb | 618 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
619 | const struct sock *sk, |
620 | const struct request_sock *req, | |
621 | const struct sk_buff *skb) | |
cfb6eeb4 | 622 | { |
b71d1d42 | 623 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
624 | struct tcp_md5sig_pool *hp; |
625 | struct hash_desc *desc; | |
318cf7aa | 626 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
627 | |
628 | if (sk) { | |
629 | saddr = &inet6_sk(sk)->saddr; | |
efe4208f | 630 | daddr = &sk->sk_v6_daddr; |
49a72dfb | 631 | } else if (req) { |
634fb979 ED |
632 | saddr = &inet_rsk(req)->ir_v6_loc_addr; |
633 | daddr = &inet_rsk(req)->ir_v6_rmt_addr; | |
49a72dfb | 634 | } else { |
b71d1d42 | 635 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
636 | saddr = &ip6h->saddr; |
637 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 638 | } |
49a72dfb AL |
639 | |
640 | hp = tcp_get_md5sig_pool(); | |
641 | if (!hp) | |
642 | goto clear_hash_noput; | |
643 | desc = &hp->md5_desc; | |
644 | ||
645 | if (crypto_hash_init(desc)) | |
646 | goto clear_hash; | |
647 | ||
648 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
649 | goto clear_hash; | |
650 | if (tcp_md5_hash_header(hp, th)) | |
651 | goto clear_hash; | |
652 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
653 | goto clear_hash; | |
654 | if (tcp_md5_hash_key(hp, key)) | |
655 | goto clear_hash; | |
656 | if (crypto_hash_final(desc, md5_hash)) | |
657 | goto clear_hash; | |
658 | ||
659 | tcp_put_md5sig_pool(); | |
660 | return 0; | |
661 | ||
662 | clear_hash: | |
663 | tcp_put_md5sig_pool(); | |
664 | clear_hash_noput: | |
665 | memset(md5_hash, 0, 16); | |
666 | return 1; | |
cfb6eeb4 YH |
667 | } |
668 | ||
318cf7aa | 669 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 670 | { |
cf533ea5 | 671 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 672 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 673 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 674 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 675 | int genhash; |
cfb6eeb4 YH |
676 | u8 newhash[16]; |
677 | ||
678 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 679 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 680 | |
785957d3 DM |
681 | /* We've parsed the options - do we have a hash? */ |
682 | if (!hash_expected && !hash_location) | |
683 | return 0; | |
684 | ||
685 | if (hash_expected && !hash_location) { | |
686 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
687 | return 1; |
688 | } | |
689 | ||
785957d3 DM |
690 | if (!hash_expected && hash_location) { |
691 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
692 | return 1; |
693 | } | |
694 | ||
695 | /* check the signature */ | |
49a72dfb AL |
696 | genhash = tcp_v6_md5_hash_skb(newhash, |
697 | hash_expected, | |
698 | NULL, NULL, skb); | |
699 | ||
cfb6eeb4 | 700 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
701 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
702 | genhash ? "failed" : "mismatch", | |
703 | &ip6h->saddr, ntohs(th->source), | |
704 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
705 | return 1; |
706 | } | |
707 | return 0; | |
708 | } | |
709 | #endif | |
710 | ||
c6aefafb | 711 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 712 | .family = AF_INET6, |
2e6599cb | 713 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 714 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
715 | .send_ack = tcp_v6_reqsk_send_ack, |
716 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc | 717 | .send_reset = tcp_v6_send_reset, |
4aa956d8 | 718 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
719 | }; |
720 | ||
cfb6eeb4 | 721 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 722 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 723 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 724 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 725 | }; |
b6332e6c | 726 | #endif |
cfb6eeb4 | 727 | |
626e264d | 728 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
9c76a114 | 729 | u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
730 | struct tcp_md5sig_key *key, int rst, u8 tclass, |
731 | u32 label) | |
1da177e4 | 732 | { |
cf533ea5 ED |
733 | const struct tcphdr *th = tcp_hdr(skb); |
734 | struct tcphdr *t1; | |
1da177e4 | 735 | struct sk_buff *buff; |
4c9483b2 | 736 | struct flowi6 fl6; |
adf30907 | 737 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 738 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 739 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 740 | struct dst_entry *dst; |
81ada62d | 741 | __be32 *topt; |
1da177e4 | 742 | |
ee684b6f | 743 | if (tsecr) |
626e264d | 744 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 745 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
746 | if (key) |
747 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
748 | #endif | |
749 | ||
cfb6eeb4 | 750 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 751 | GFP_ATOMIC); |
1ab1457c YH |
752 | if (buff == NULL) |
753 | return; | |
1da177e4 | 754 | |
cfb6eeb4 | 755 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 756 | |
cfb6eeb4 | 757 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 758 | skb_reset_transport_header(buff); |
1da177e4 LT |
759 | |
760 | /* Swap the send and the receive. */ | |
761 | memset(t1, 0, sizeof(*t1)); | |
762 | t1->dest = th->source; | |
763 | t1->source = th->dest; | |
cfb6eeb4 | 764 | t1->doff = tot_len / 4; |
626e264d IJ |
765 | t1->seq = htonl(seq); |
766 | t1->ack_seq = htonl(ack); | |
767 | t1->ack = !rst || !th->ack; | |
768 | t1->rst = rst; | |
769 | t1->window = htons(win); | |
1da177e4 | 770 | |
81ada62d IJ |
771 | topt = (__be32 *)(t1 + 1); |
772 | ||
ee684b6f | 773 | if (tsecr) { |
626e264d IJ |
774 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
775 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
776 | *topt++ = htonl(tsval); |
777 | *topt++ = htonl(tsecr); | |
626e264d IJ |
778 | } |
779 | ||
cfb6eeb4 YH |
780 | #ifdef CONFIG_TCP_MD5SIG |
781 | if (key) { | |
81ada62d IJ |
782 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
783 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
784 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
785 | &ipv6_hdr(skb)->saddr, |
786 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
787 | } |
788 | #endif | |
789 | ||
4c9483b2 | 790 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
791 | fl6.daddr = ipv6_hdr(skb)->saddr; |
792 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1d13a96c | 793 | fl6.flowlabel = label; |
1da177e4 | 794 | |
e5700aff DM |
795 | buff->ip_summed = CHECKSUM_PARTIAL; |
796 | buff->csum = 0; | |
797 | ||
4c9483b2 | 798 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 799 | |
4c9483b2 | 800 | fl6.flowi6_proto = IPPROTO_TCP; |
9c76a114 | 801 | if (rt6_need_strict(&fl6.daddr) || !oif) |
4c675258 | 802 | fl6.flowi6_oif = inet6_iif(skb); |
9c76a114 WY |
803 | else |
804 | fl6.flowi6_oif = oif; | |
1958b856 DM |
805 | fl6.fl6_dport = t1->dest; |
806 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 807 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 808 | |
c20121ae DL |
809 | /* Pass a socket to ip6_dst_lookup either it is for RST |
810 | * Underlying function will use this to retrieve the network | |
811 | * namespace | |
812 | */ | |
0e0d44ab | 813 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL); |
68d0c6d3 DM |
814 | if (!IS_ERR(dst)) { |
815 | skb_dst_set(buff, dst); | |
b903d324 | 816 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
817 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
818 | if (rst) | |
819 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
820 | return; | |
1da177e4 LT |
821 | } |
822 | ||
823 | kfree_skb(buff); | |
824 | } | |
825 | ||
626e264d | 826 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 827 | { |
cf533ea5 | 828 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 829 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 830 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
831 | #ifdef CONFIG_TCP_MD5SIG |
832 | const __u8 *hash_location = NULL; | |
833 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
834 | unsigned char newhash[16]; | |
835 | int genhash; | |
836 | struct sock *sk1 = NULL; | |
837 | #endif | |
9c76a114 | 838 | int oif; |
1da177e4 | 839 | |
626e264d | 840 | if (th->rst) |
1da177e4 LT |
841 | return; |
842 | ||
626e264d IJ |
843 | if (!ipv6_unicast_destination(skb)) |
844 | return; | |
1da177e4 | 845 | |
cfb6eeb4 | 846 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
847 | hash_location = tcp_parse_md5sig_option(th); |
848 | if (!sk && hash_location) { | |
849 | /* | |
850 | * active side is lost. Try to find listening socket through | |
851 | * source port, and then find md5 key through listening socket. | |
852 | * we are not loose security here: | |
853 | * Incoming packet is checked with md5 hash with finding key, | |
854 | * no RST generated if md5 hash doesn't match. | |
855 | */ | |
856 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
857 | &tcp_hashinfo, &ipv6h->saddr, |
858 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
859 | ntohs(th->source), inet6_iif(skb)); |
860 | if (!sk1) | |
861 | return; | |
862 | ||
863 | rcu_read_lock(); | |
864 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
865 | if (!key) | |
866 | goto release_sk1; | |
867 | ||
868 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
869 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
870 | goto release_sk1; | |
871 | } else { | |
872 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
873 | } | |
cfb6eeb4 YH |
874 | #endif |
875 | ||
626e264d IJ |
876 | if (th->ack) |
877 | seq = ntohl(th->ack_seq); | |
878 | else | |
879 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
880 | (th->doff << 2); | |
1da177e4 | 881 | |
9c76a114 WY |
882 | oif = sk ? sk->sk_bound_dev_if : 0; |
883 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0); | |
658ddaaf SL |
884 | |
885 | #ifdef CONFIG_TCP_MD5SIG | |
886 | release_sk1: | |
887 | if (sk1) { | |
888 | rcu_read_unlock(); | |
889 | sock_put(sk1); | |
890 | } | |
891 | #endif | |
626e264d | 892 | } |
1da177e4 | 893 | |
ee684b6f | 894 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
9c76a114 | 895 | u32 win, u32 tsval, u32 tsecr, int oif, |
1d13a96c FF |
896 | struct tcp_md5sig_key *key, u8 tclass, |
897 | u32 label) | |
626e264d | 898 | { |
9c76a114 | 899 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, oif, key, 0, tclass, |
1d13a96c | 900 | label); |
1da177e4 LT |
901 | } |
902 | ||
903 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
904 | { | |
8feaf0c0 | 905 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 906 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 907 | |
9501f972 | 908 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 909 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 910 | tcp_time_stamp + tcptw->tw_ts_offset, |
9c76a114 | 911 | tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw), |
1d13a96c | 912 | tw->tw_tclass, (tw->tw_flowlabel << 12)); |
1da177e4 | 913 | |
8feaf0c0 | 914 | inet_twsk_put(tw); |
1da177e4 LT |
915 | } |
916 | ||
6edafaaf GJ |
917 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
918 | struct request_sock *req) | |
1da177e4 | 919 | { |
ee684b6f | 920 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
9c76a114 | 921 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, sk->sk_bound_dev_if, |
1d13a96c FF |
922 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), |
923 | 0, 0); | |
1da177e4 LT |
924 | } |
925 | ||
926 | ||
4c99aa40 | 927 | static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 928 | { |
60236fdd | 929 | struct request_sock *req, **prev; |
aa8223c7 | 930 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
931 | struct sock *nsk; |
932 | ||
933 | /* Find possible connection requests. */ | |
8129765a | 934 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
935 | &ipv6_hdr(skb)->saddr, |
936 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 937 | if (req) |
8336886f | 938 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 939 | |
3b1e0a65 | 940 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
941 | &ipv6_hdr(skb)->saddr, th->source, |
942 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
943 | |
944 | if (nsk) { | |
945 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
946 | bh_lock_sock(nsk); | |
947 | return nsk; | |
948 | } | |
9469c7b4 | 949 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
950 | return NULL; |
951 | } | |
952 | ||
c6aefafb | 953 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 954 | if (!th->syn) |
c6aefafb | 955 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
956 | #endif |
957 | return sk; | |
958 | } | |
959 | ||
1da177e4 LT |
960 | /* FIXME: this is substantially similar to the ipv4 code. |
961 | * Can some kind of merge be done? -- erics | |
962 | */ | |
963 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
964 | { | |
e6b4d113 WAS |
965 | struct tcp_options_received tmp_opt; |
966 | struct request_sock *req; | |
634fb979 | 967 | struct inet_request_sock *ireq; |
1da177e4 | 968 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 969 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 970 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 971 | struct dst_entry *dst = NULL; |
3840a06e | 972 | struct flowi6 fl6; |
a2a385d6 | 973 | bool want_cookie = false; |
1da177e4 LT |
974 | |
975 | if (skb->protocol == htons(ETH_P_IP)) | |
976 | return tcp_v4_conn_request(sk, skb); | |
977 | ||
978 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 979 | goto drop; |
1da177e4 | 980 | |
5ad37d5d HFS |
981 | if ((sysctl_tcp_syncookies == 2 || |
982 | inet_csk_reqsk_queue_is_full(sk)) && !isn) { | |
946cedcc ED |
983 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
984 | if (!want_cookie) | |
985 | goto drop; | |
1da177e4 LT |
986 | } |
987 | ||
5f1e942c VS |
988 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
989 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 990 | goto drop; |
5f1e942c | 991 | } |
1da177e4 | 992 | |
ca304b61 | 993 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
994 | if (req == NULL) |
995 | goto drop; | |
996 | ||
cfb6eeb4 YH |
997 | #ifdef CONFIG_TCP_MD5SIG |
998 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
999 | #endif | |
1000 | ||
1da177e4 LT |
1001 | tcp_clear_options(&tmp_opt); |
1002 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1003 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1a2c6181 | 1004 | tcp_parse_options(skb, &tmp_opt, 0, NULL); |
1da177e4 | 1005 | |
4dfc2817 | 1006 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1007 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1008 | |
1da177e4 LT |
1009 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1010 | tcp_openreq_init(req, &tmp_opt, skb); | |
1011 | ||
634fb979 ED |
1012 | ireq = inet_rsk(req); |
1013 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; | |
1014 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1015 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1016 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1017 | |
634fb979 | 1018 | ireq->ir_iif = sk->sk_bound_dev_if; |
4d0fe50c ED |
1019 | |
1020 | /* So that link locals have meaning */ | |
1021 | if (!sk->sk_bound_dev_if && | |
634fb979 ED |
1022 | ipv6_addr_type(&ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
1023 | ireq->ir_iif = inet6_iif(skb); | |
4d0fe50c | 1024 | |
2bbdf389 | 1025 | if (!isn) { |
c6aefafb GG |
1026 | if (ipv6_opt_accepted(sk, skb) || |
1027 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
df3687ff FF |
1028 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim || |
1029 | np->repflow) { | |
c6aefafb | 1030 | atomic_inc(&skb->users); |
634fb979 | 1031 | ireq->pktopts = skb; |
c6aefafb | 1032 | } |
493f377d DM |
1033 | |
1034 | if (want_cookie) { | |
2bbdf389 FW |
1035 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1036 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1037 | goto have_isn; |
1038 | } | |
1039 | ||
1040 | /* VJ's idea. We save last timestamp seen | |
1041 | * from the destination in peer table, when entering | |
1042 | * state TIME-WAIT, and check against it before | |
1043 | * accepting new connection request. | |
1044 | * | |
1045 | * If "isn" is not zero, this request hit alive | |
1046 | * timewait bucket, so that all the necessary checks | |
1047 | * are made in the function processing timewait state. | |
1048 | */ | |
1049 | if (tmp_opt.saw_tstamp && | |
1050 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1051 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1052 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1053 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1054 | goto drop_and_release; | |
1055 | } | |
1056 | } | |
1057 | /* Kill the following clause, if you dislike this way. */ | |
1058 | else if (!sysctl_tcp_syncookies && | |
1059 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1060 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1061 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1062 | /* Without syncookies last quarter of |
1063 | * backlog is filled with destinations, | |
1064 | * proven to be alive. | |
1065 | * It means that we continue to communicate | |
1066 | * to destinations, already remembered | |
1067 | * to the moment of synflood. | |
1068 | */ | |
1069 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
634fb979 | 1070 | &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source)); |
493f377d | 1071 | goto drop_and_release; |
2bbdf389 | 1072 | } |
493f377d DM |
1073 | |
1074 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1075 | } |
493f377d | 1076 | have_isn: |
2e6599cb | 1077 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1078 | |
437c5b53 NC |
1079 | if (security_inet_conn_request(sk, skb, req)) |
1080 | goto drop_and_release; | |
4237c75c | 1081 | |
9f10d3f6 | 1082 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 | 1083 | skb_get_queue_mapping(skb)) || |
4957faad | 1084 | want_cookie) |
e6b4d113 | 1085 | goto drop_and_free; |
1da177e4 | 1086 | |
016818d0 | 1087 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1088 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1089 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1090 | return 0; | |
1da177e4 | 1091 | |
493f377d DM |
1092 | drop_and_release: |
1093 | dst_release(dst); | |
e6b4d113 WAS |
1094 | drop_and_free: |
1095 | reqsk_free(req); | |
1da177e4 | 1096 | drop: |
5f1e942c | 1097 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1098 | return 0; /* don't send reset */ |
1099 | } | |
1100 | ||
4c99aa40 WC |
1101 | static struct sock *tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
1102 | struct request_sock *req, | |
1103 | struct dst_entry *dst) | |
1da177e4 | 1104 | { |
634fb979 | 1105 | struct inet_request_sock *ireq; |
1da177e4 LT |
1106 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1107 | struct tcp6_sock *newtcp6sk; | |
1108 | struct inet_sock *newinet; | |
1109 | struct tcp_sock *newtp; | |
1110 | struct sock *newsk; | |
cfb6eeb4 YH |
1111 | #ifdef CONFIG_TCP_MD5SIG |
1112 | struct tcp_md5sig_key *key; | |
1113 | #endif | |
3840a06e | 1114 | struct flowi6 fl6; |
1da177e4 LT |
1115 | |
1116 | if (skb->protocol == htons(ETH_P_IP)) { | |
1117 | /* | |
1118 | * v6 mapped | |
1119 | */ | |
1120 | ||
1121 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1122 | ||
1ab1457c | 1123 | if (newsk == NULL) |
1da177e4 LT |
1124 | return NULL; |
1125 | ||
1126 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1127 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1128 | ||
1129 | newinet = inet_sk(newsk); | |
1130 | newnp = inet6_sk(newsk); | |
1131 | newtp = tcp_sk(newsk); | |
1132 | ||
1133 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1134 | ||
efe4208f | 1135 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr); |
1da177e4 | 1136 | |
c720c7e8 | 1137 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1138 | |
efe4208f | 1139 | newsk->sk_v6_rcv_saddr = newnp->saddr; |
1da177e4 | 1140 | |
8292a17a | 1141 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1142 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1143 | #ifdef CONFIG_TCP_MD5SIG |
1144 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1145 | #endif | |
1146 | ||
676a1184 YZ |
1147 | newnp->ipv6_ac_list = NULL; |
1148 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1149 | newnp->pktoptions = NULL; |
1150 | newnp->opt = NULL; | |
505cbfc5 | 1151 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1152 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1153 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1154 | if (np->repflow) |
1155 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 | 1156 | |
e6848976 ACM |
1157 | /* |
1158 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1159 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1160 | * that function for the gory details. -acme | |
1da177e4 | 1161 | */ |
1da177e4 LT |
1162 | |
1163 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1164 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1165 | Sync it now. |
1166 | */ | |
d83d8461 | 1167 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1168 | |
1169 | return newsk; | |
1170 | } | |
1171 | ||
634fb979 | 1172 | ireq = inet_rsk(req); |
1da177e4 LT |
1173 | |
1174 | if (sk_acceptq_is_full(sk)) | |
1175 | goto out_overflow; | |
1176 | ||
493f377d | 1177 | if (!dst) { |
3840a06e | 1178 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1179 | if (!dst) |
1da177e4 | 1180 | goto out; |
1ab1457c | 1181 | } |
1da177e4 LT |
1182 | |
1183 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1184 | if (newsk == NULL) | |
093d2823 | 1185 | goto out_nonewsk; |
1da177e4 | 1186 | |
e6848976 ACM |
1187 | /* |
1188 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1189 | * count here, tcp_create_openreq_child now does this for us, see the | |
1190 | * comment in that function for the gory details. -acme | |
1191 | */ | |
1da177e4 | 1192 | |
59eed279 | 1193 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1194 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1195 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1196 | |
1197 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1198 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1199 | ||
1200 | newtp = tcp_sk(newsk); | |
1201 | newinet = inet_sk(newsk); | |
1202 | newnp = inet6_sk(newsk); | |
1203 | ||
1204 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1205 | ||
634fb979 ED |
1206 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
1207 | newnp->saddr = ireq->ir_v6_loc_addr; | |
1208 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; | |
1209 | newsk->sk_bound_dev_if = ireq->ir_iif; | |
1da177e4 | 1210 | |
1ab1457c | 1211 | /* Now IPv6 options... |
1da177e4 LT |
1212 | |
1213 | First: no IPv4 options. | |
1214 | */ | |
f6d8bd05 | 1215 | newinet->inet_opt = NULL; |
676a1184 | 1216 | newnp->ipv6_ac_list = NULL; |
d35690be | 1217 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1218 | |
1219 | /* Clone RX bits */ | |
1220 | newnp->rxopt.all = np->rxopt.all; | |
1221 | ||
1222 | /* Clone pktoptions received with SYN */ | |
1223 | newnp->pktoptions = NULL; | |
634fb979 ED |
1224 | if (ireq->pktopts != NULL) { |
1225 | newnp->pktoptions = skb_clone(ireq->pktopts, | |
99a1dec7 | 1226 | sk_gfp_atomic(sk, GFP_ATOMIC)); |
634fb979 ED |
1227 | consume_skb(ireq->pktopts); |
1228 | ireq->pktopts = NULL; | |
1da177e4 LT |
1229 | if (newnp->pktoptions) |
1230 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1231 | } | |
1232 | newnp->opt = NULL; | |
505cbfc5 | 1233 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1234 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1397ed35 | 1235 | newnp->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(skb)); |
df3687ff FF |
1236 | if (np->repflow) |
1237 | newnp->flow_label = ip6_flowlabel(ipv6_hdr(skb)); | |
1da177e4 LT |
1238 | |
1239 | /* Clone native IPv6 options from listening socket (if any) | |
1240 | ||
1241 | Yes, keeping reference count would be much more clever, | |
1242 | but we make one more one thing there: reattach optmem | |
1243 | to newsk. | |
1244 | */ | |
43264e0b RL |
1245 | if (np->opt) |
1246 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1247 | |
d83d8461 | 1248 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1249 | if (newnp->opt) |
d83d8461 ACM |
1250 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1251 | newnp->opt->opt_flen); | |
1da177e4 LT |
1252 | |
1253 | tcp_sync_mss(newsk, dst_mtu(dst)); | |
0dbaee3b | 1254 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1255 | if (tcp_sk(sk)->rx_opt.user_mss && |
1256 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1257 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1258 | ||
1da177e4 LT |
1259 | tcp_initialize_rcv_mss(newsk); |
1260 | ||
c720c7e8 ED |
1261 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1262 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1263 | |
cfb6eeb4 YH |
1264 | #ifdef CONFIG_TCP_MD5SIG |
1265 | /* Copy over the MD5 key from the original socket */ | |
4aa956d8 WY |
1266 | key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr); |
1267 | if (key != NULL) { | |
cfb6eeb4 YH |
1268 | /* We're using one, so create a matching key |
1269 | * on the newsk structure. If we fail to get | |
1270 | * memory, then we end up not copying the key | |
1271 | * across. Shucks. | |
1272 | */ | |
efe4208f | 1273 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr, |
99a1dec7 MG |
1274 | AF_INET6, key->key, key->keylen, |
1275 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1276 | } |
1277 | #endif | |
1278 | ||
093d2823 | 1279 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1280 | inet_csk_prepare_forced_close(newsk); |
1281 | tcp_done(newsk); | |
093d2823 BS |
1282 | goto out; |
1283 | } | |
9327f705 | 1284 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1285 | |
1286 | return newsk; | |
1287 | ||
1288 | out_overflow: | |
de0744af | 1289 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1290 | out_nonewsk: |
1da177e4 | 1291 | dst_release(dst); |
093d2823 BS |
1292 | out: |
1293 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1294 | return NULL; |
1295 | } | |
1296 | ||
b51655b9 | 1297 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1298 | { |
84fa7933 | 1299 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1300 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1301 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1302 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1303 | return 0; |
fb286bb2 | 1304 | } |
1da177e4 | 1305 | } |
fb286bb2 | 1306 | |
684f2176 | 1307 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1308 | &ipv6_hdr(skb)->saddr, |
1309 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1310 | |
4aa956d8 | 1311 | if (skb->len <= 76) |
fb286bb2 | 1312 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1313 | return 0; |
1314 | } | |
1315 | ||
1316 | /* The socket must have it's spinlock held when we get | |
1317 | * here. | |
1318 | * | |
1319 | * We have a potential double-lock case here, so even when | |
1320 | * doing backlog processing we use the BH locking scheme. | |
1321 | * This is because we cannot sleep with the original spinlock | |
1322 | * held. | |
1323 | */ | |
1324 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1325 | { | |
1326 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1327 | struct tcp_sock *tp; | |
1328 | struct sk_buff *opt_skb = NULL; | |
1329 | ||
1330 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1331 | goes to IPv4 receive handler and backlogged. | |
1332 | From backlog it always goes here. Kerboom... | |
1333 | Fortunately, tcp_rcv_established and rcv_established | |
1334 | handle them correctly, but it is not case with | |
1335 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1336 | */ | |
1337 | ||
1338 | if (skb->protocol == htons(ETH_P_IP)) | |
1339 | return tcp_v4_do_rcv(sk, skb); | |
1340 | ||
cfb6eeb4 | 1341 | #ifdef CONFIG_TCP_MD5SIG |
4aa956d8 | 1342 | if (tcp_v6_inbound_md5_hash(sk, skb)) |
cfb6eeb4 YH |
1343 | goto discard; |
1344 | #endif | |
1345 | ||
fda9ef5d | 1346 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1347 | goto discard; |
1348 | ||
1349 | /* | |
1350 | * socket locking is here for SMP purposes as backlog rcv | |
1351 | * is currently called with bh processing disabled. | |
1352 | */ | |
1353 | ||
1354 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1355 | ||
1356 | Yes, guys, it is the only place in our code, where we | |
1357 | may make it not affecting IPv4. | |
1358 | The rest of code is protocol independent, | |
1359 | and I do not like idea to uglify IPv4. | |
1360 | ||
1361 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1362 | looks not very well thought. For now we latch | |
1363 | options, received in the last packet, enqueued | |
1364 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1365 | --ANK (980728) |
1da177e4 LT |
1366 | */ |
1367 | if (np->rxopt.all) | |
99a1dec7 | 1368 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1369 | |
1370 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1371 | struct dst_entry *dst = sk->sk_rx_dst; |
1372 | ||
bdeab991 | 1373 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1374 | if (dst) { |
1375 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1376 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1377 | dst_release(dst); | |
1378 | sk->sk_rx_dst = NULL; | |
1379 | } | |
1380 | } | |
1381 | ||
c995ae22 | 1382 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1383 | if (opt_skb) |
1384 | goto ipv6_pktoptions; | |
1385 | return 0; | |
1386 | } | |
1387 | ||
ab6a5bb6 | 1388 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1389 | goto csum_err; |
1390 | ||
1ab1457c | 1391 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1392 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1393 | if (!nsk) | |
1394 | goto discard; | |
1395 | ||
1396 | /* | |
1397 | * Queue it on the new socket if the new socket is active, | |
1398 | * otherwise we just shortcircuit this and continue with | |
1399 | * the new socket.. | |
1400 | */ | |
4c99aa40 | 1401 | if (nsk != sk) { |
bdeab991 | 1402 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1403 | if (tcp_child_process(sk, nsk, skb)) |
1404 | goto reset; | |
1405 | if (opt_skb) | |
1406 | __kfree_skb(opt_skb); | |
1407 | return 0; | |
1408 | } | |
47482f13 | 1409 | } else |
bdeab991 | 1410 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1411 | |
aa8223c7 | 1412 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1413 | goto reset; |
1da177e4 LT |
1414 | if (opt_skb) |
1415 | goto ipv6_pktoptions; | |
1416 | return 0; | |
1417 | ||
1418 | reset: | |
cfb6eeb4 | 1419 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1420 | discard: |
1421 | if (opt_skb) | |
1422 | __kfree_skb(opt_skb); | |
1423 | kfree_skb(skb); | |
1424 | return 0; | |
1425 | csum_err: | |
6a5dc9e5 | 1426 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1427 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1428 | goto discard; |
1429 | ||
1430 | ||
1431 | ipv6_pktoptions: | |
1432 | /* Do you ask, what is it? | |
1433 | ||
1434 | 1. skb was enqueued by tcp. | |
1435 | 2. skb is added to tail of read queue, rather than out of order. | |
1436 | 3. socket is not in passive state. | |
1437 | 4. Finally, it really contains options, which user wants to receive. | |
1438 | */ | |
1439 | tp = tcp_sk(sk); | |
1440 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1441 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1442 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1443 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1444 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1445 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
82e9f105 | 1446 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
1397ed35 | 1447 | np->rcv_flowinfo = ip6_flowinfo(ipv6_hdr(opt_skb)); |
df3687ff FF |
1448 | if (np->repflow) |
1449 | np->flow_label = ip6_flowlabel(ipv6_hdr(opt_skb)); | |
1da177e4 LT |
1450 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1451 | skb_set_owner_r(opt_skb, sk); | |
1452 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1453 | } else { | |
1454 | __kfree_skb(opt_skb); | |
1455 | opt_skb = xchg(&np->pktoptions, NULL); | |
1456 | } | |
1457 | } | |
1458 | ||
800d55f1 | 1459 | kfree_skb(opt_skb); |
1da177e4 LT |
1460 | return 0; |
1461 | } | |
1462 | ||
e5bbef20 | 1463 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1464 | { |
cf533ea5 | 1465 | const struct tcphdr *th; |
b71d1d42 | 1466 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1467 | struct sock *sk; |
1468 | int ret; | |
a86b1e30 | 1469 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1470 | |
1471 | if (skb->pkt_type != PACKET_HOST) | |
1472 | goto discard_it; | |
1473 | ||
1474 | /* | |
1475 | * Count it even if it's bad. | |
1476 | */ | |
63231bdd | 1477 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1478 | |
1479 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1480 | goto discard_it; | |
1481 | ||
aa8223c7 | 1482 | th = tcp_hdr(skb); |
1da177e4 LT |
1483 | |
1484 | if (th->doff < sizeof(struct tcphdr)/4) | |
1485 | goto bad_packet; | |
1486 | if (!pskb_may_pull(skb, th->doff*4)) | |
1487 | goto discard_it; | |
1488 | ||
60476372 | 1489 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
6a5dc9e5 | 1490 | goto csum_error; |
1da177e4 | 1491 | |
aa8223c7 | 1492 | th = tcp_hdr(skb); |
e802af9c | 1493 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1494 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1495 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1496 | skb->len - th->doff*4); | |
1497 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1498 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1499 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1500 | TCP_SKB_CB(skb)->sacked = 0; |
1501 | ||
9a1f27c4 | 1502 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1503 | if (!sk) |
1504 | goto no_tcp_socket; | |
1505 | ||
1506 | process: | |
1507 | if (sk->sk_state == TCP_TIME_WAIT) | |
1508 | goto do_time_wait; | |
1509 | ||
e802af9c SH |
1510 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1511 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1512 | goto discard_and_relse; | |
1513 | } | |
1514 | ||
1da177e4 LT |
1515 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1516 | goto discard_and_relse; | |
1517 | ||
fda9ef5d | 1518 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1519 | goto discard_and_relse; |
1520 | ||
8b80cda5 | 1521 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1522 | skb->dev = NULL; |
1523 | ||
293b9c42 | 1524 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1525 | ret = 0; |
1526 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1527 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1528 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1529 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1530 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1531 | if (tp->ucopy.dma_chan) |
1532 | ret = tcp_v6_do_rcv(sk, skb); | |
1533 | else | |
1a2449a8 CL |
1534 | #endif |
1535 | { | |
1536 | if (!tcp_prequeue(sk, skb)) | |
1537 | ret = tcp_v6_do_rcv(sk, skb); | |
1538 | } | |
da882c1f ED |
1539 | } else if (unlikely(sk_add_backlog(sk, skb, |
1540 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1541 | bh_unlock_sock(sk); |
6cce09f8 | 1542 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1543 | goto discard_and_relse; |
1544 | } | |
1da177e4 LT |
1545 | bh_unlock_sock(sk); |
1546 | ||
1547 | sock_put(sk); | |
1548 | return ret ? -1 : 0; | |
1549 | ||
1550 | no_tcp_socket: | |
1551 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1552 | goto discard_it; | |
1553 | ||
1554 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1555 | csum_error: |
1556 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1557 | bad_packet: |
63231bdd | 1558 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1559 | } else { |
cfb6eeb4 | 1560 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1561 | } |
1562 | ||
1563 | discard_it: | |
1da177e4 LT |
1564 | kfree_skb(skb); |
1565 | return 0; | |
1566 | ||
1567 | discard_and_relse: | |
1568 | sock_put(sk); | |
1569 | goto discard_it; | |
1570 | ||
1571 | do_time_wait: | |
1572 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1573 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1574 | goto discard_it; |
1575 | } | |
1576 | ||
6a5dc9e5 | 1577 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1578 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1579 | goto bad_packet; |
1580 | } | |
1581 | if (tcp_checksum_complete(skb)) { | |
1582 | inet_twsk_put(inet_twsk(sk)); | |
1583 | goto csum_error; | |
1da177e4 LT |
1584 | } |
1585 | ||
9469c7b4 | 1586 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1587 | case TCP_TW_SYN: |
1588 | { | |
1589 | struct sock *sk2; | |
1590 | ||
c346dca1 | 1591 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1592 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1593 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1594 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1595 | if (sk2 != NULL) { |
295ff7ed ACM |
1596 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1597 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1598 | inet_twsk_put(tw); | |
1da177e4 LT |
1599 | sk = sk2; |
1600 | goto process; | |
1601 | } | |
1602 | /* Fall through to ACK */ | |
1603 | } | |
1604 | case TCP_TW_ACK: | |
1605 | tcp_v6_timewait_ack(sk, skb); | |
1606 | break; | |
1607 | case TCP_TW_RST: | |
1608 | goto no_tcp_socket; | |
4aa956d8 WY |
1609 | case TCP_TW_SUCCESS: |
1610 | ; | |
1da177e4 LT |
1611 | } |
1612 | goto discard_it; | |
1613 | } | |
1614 | ||
c7109986 ED |
1615 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1616 | { | |
1617 | const struct ipv6hdr *hdr; | |
1618 | const struct tcphdr *th; | |
1619 | struct sock *sk; | |
1620 | ||
1621 | if (skb->pkt_type != PACKET_HOST) | |
1622 | return; | |
1623 | ||
1624 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1625 | return; | |
1626 | ||
1627 | hdr = ipv6_hdr(skb); | |
1628 | th = tcp_hdr(skb); | |
1629 | ||
1630 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1631 | return; | |
1632 | ||
1633 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1634 | &hdr->saddr, th->source, | |
1635 | &hdr->daddr, ntohs(th->dest), | |
1636 | inet6_iif(skb)); | |
1637 | if (sk) { | |
1638 | skb->sk = sk; | |
1639 | skb->destructor = sock_edemux; | |
1640 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1641 | struct dst_entry *dst = sk->sk_rx_dst; | |
f3f12135 | 1642 | |
c7109986 | 1643 | if (dst) |
5d299f3d | 1644 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1645 | if (dst && |
f3f12135 | 1646 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1647 | skb_dst_set_noref(skb, dst); |
1648 | } | |
1649 | } | |
1650 | } | |
1651 | ||
ccb7c410 DM |
1652 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1653 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1654 | .twsk_unique = tcp_twsk_unique, | |
4aa956d8 | 1655 | .twsk_destructor = tcp_twsk_destructor, |
ccb7c410 DM |
1656 | }; |
1657 | ||
3b401a81 | 1658 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1659 | .queue_xmit = inet6_csk_xmit, |
1660 | .send_check = tcp_v6_send_check, | |
1661 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1662 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1663 | .conn_request = tcp_v6_conn_request, |
1664 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1665 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1666 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1667 | .setsockopt = ipv6_setsockopt, |
1668 | .getsockopt = ipv6_getsockopt, | |
1669 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1670 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1671 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1672 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1673 | .compat_setsockopt = compat_ipv6_setsockopt, |
1674 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1675 | #endif |
1da177e4 LT |
1676 | }; |
1677 | ||
cfb6eeb4 | 1678 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1679 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1680 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1681 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1682 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1683 | }; |
a928630a | 1684 | #endif |
cfb6eeb4 | 1685 | |
1da177e4 LT |
1686 | /* |
1687 | * TCP over IPv4 via INET6 API | |
1688 | */ | |
3b401a81 | 1689 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1690 | .queue_xmit = ip_queue_xmit, |
1691 | .send_check = tcp_v4_send_check, | |
1692 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1693 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1694 | .conn_request = tcp_v6_conn_request, |
1695 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1696 | .net_header_len = sizeof(struct iphdr), |
1697 | .setsockopt = ipv6_setsockopt, | |
1698 | .getsockopt = ipv6_getsockopt, | |
1699 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1700 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1701 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1702 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1703 | .compat_setsockopt = compat_ipv6_setsockopt, |
1704 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1705 | #endif |
1da177e4 LT |
1706 | }; |
1707 | ||
cfb6eeb4 | 1708 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1709 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1710 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1711 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1712 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1713 | }; |
a928630a | 1714 | #endif |
cfb6eeb4 | 1715 | |
1da177e4 LT |
1716 | /* NOTE: A lot of things set to zero explicitly by call to |
1717 | * sk_alloc() so need not be done here. | |
1718 | */ | |
1719 | static int tcp_v6_init_sock(struct sock *sk) | |
1720 | { | |
6687e988 | 1721 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1722 | |
900f65d3 | 1723 | tcp_init_sock(sk); |
1da177e4 | 1724 | |
8292a17a | 1725 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1726 | |
cfb6eeb4 | 1727 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1728 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1729 | #endif |
1730 | ||
1da177e4 LT |
1731 | return 0; |
1732 | } | |
1733 | ||
7d06b2e0 | 1734 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1735 | { |
1da177e4 | 1736 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1737 | inet6_destroy_sock(sk); |
1da177e4 LT |
1738 | } |
1739 | ||
952a10be | 1740 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1741 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1742 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1743 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1744 | { |
1da177e4 | 1745 | int ttd = req->expires - jiffies; |
634fb979 ED |
1746 | const struct in6_addr *src = &inet_rsk(req)->ir_v6_loc_addr; |
1747 | const struct in6_addr *dest = &inet_rsk(req)->ir_v6_rmt_addr; | |
1da177e4 LT |
1748 | |
1749 | if (ttd < 0) | |
1750 | ttd = 0; | |
1751 | ||
1da177e4 LT |
1752 | seq_printf(seq, |
1753 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1754 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %d %d %pK\n", |
1da177e4 LT |
1755 | i, |
1756 | src->s6_addr32[0], src->s6_addr32[1], | |
1757 | src->s6_addr32[2], src->s6_addr32[3], | |
b44084c2 | 1758 | inet_rsk(req)->ir_num, |
1da177e4 LT |
1759 | dest->s6_addr32[0], dest->s6_addr32[1], |
1760 | dest->s6_addr32[2], dest->s6_addr32[3], | |
634fb979 | 1761 | ntohs(inet_rsk(req)->ir_rmt_port), |
1da177e4 | 1762 | TCP_SYN_RECV, |
4c99aa40 | 1763 | 0, 0, /* could print option size, but that is af dependent. */ |
1ab1457c YH |
1764 | 1, /* timers active (only the expire timer) */ |
1765 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1766 | req->num_timeout, |
a7cb5a49 | 1767 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1768 | 0, /* non standard timer */ |
1da177e4 LT |
1769 | 0, /* open_requests have no inode */ |
1770 | 0, req); | |
1771 | } | |
1772 | ||
1773 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1774 | { | |
b71d1d42 | 1775 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1776 | __u16 destp, srcp; |
1777 | int timer_active; | |
1778 | unsigned long timer_expires; | |
cf533ea5 ED |
1779 | const struct inet_sock *inet = inet_sk(sp); |
1780 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1781 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 | 1782 | |
efe4208f ED |
1783 | dest = &sp->sk_v6_daddr; |
1784 | src = &sp->sk_v6_rcv_saddr; | |
c720c7e8 ED |
1785 | destp = ntohs(inet->inet_dport); |
1786 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1787 | |
1788 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1789 | timer_active = 1; |
463c84b9 ACM |
1790 | timer_expires = icsk->icsk_timeout; |
1791 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1792 | timer_active = 4; |
463c84b9 | 1793 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1794 | } else if (timer_pending(&sp->sk_timer)) { |
1795 | timer_active = 2; | |
1796 | timer_expires = sp->sk_timer.expires; | |
1797 | } else { | |
1798 | timer_active = 0; | |
1799 | timer_expires = jiffies; | |
1800 | } | |
1801 | ||
1802 | seq_printf(seq, | |
1803 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 1804 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1805 | i, |
1806 | src->s6_addr32[0], src->s6_addr32[1], | |
1807 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1808 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1809 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1810 | sp->sk_state, |
47da8ee6 SS |
1811 | tp->write_seq-tp->snd_una, |
1812 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1813 | timer_active, |
a399a805 | 1814 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1815 | icsk->icsk_retransmits, |
a7cb5a49 | 1816 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1817 | icsk->icsk_probes_out, |
1da177e4 LT |
1818 | sock_i_ino(sp), |
1819 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1820 | jiffies_to_clock_t(icsk->icsk_rto), |
1821 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
4c99aa40 | 1822 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1823 | tp->snd_cwnd, |
1824 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1825 | ); |
1826 | } | |
1827 | ||
1ab1457c | 1828 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1829 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1830 | { |
b71d1d42 | 1831 | const struct in6_addr *dest, *src; |
1da177e4 | 1832 | __u16 destp, srcp; |
96f817fe | 1833 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 | 1834 | |
efe4208f ED |
1835 | dest = &tw->tw_v6_daddr; |
1836 | src = &tw->tw_v6_rcv_saddr; | |
1da177e4 LT |
1837 | destp = ntohs(tw->tw_dport); |
1838 | srcp = ntohs(tw->tw_sport); | |
1839 | ||
1840 | seq_printf(seq, | |
1841 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1842 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1843 | i, |
1844 | src->s6_addr32[0], src->s6_addr32[1], | |
1845 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1846 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1847 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1848 | tw->tw_substate, 0, 0, | |
a399a805 | 1849 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1850 | atomic_read(&tw->tw_refcnt), tw); |
1851 | } | |
1852 | ||
1da177e4 LT |
1853 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1854 | { | |
1855 | struct tcp_iter_state *st; | |
05dbc7b5 | 1856 | struct sock *sk = v; |
1da177e4 LT |
1857 | |
1858 | if (v == SEQ_START_TOKEN) { | |
1859 | seq_puts(seq, | |
1860 | " sl " | |
1861 | "local_address " | |
1862 | "remote_address " | |
1863 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1864 | " uid timeout inode\n"); | |
1865 | goto out; | |
1866 | } | |
1867 | st = seq->private; | |
1868 | ||
1869 | switch (st->state) { | |
1870 | case TCP_SEQ_STATE_LISTENING: | |
1871 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 ED |
1872 | if (sk->sk_state == TCP_TIME_WAIT) |
1873 | get_timewait6_sock(seq, v, st->num); | |
1874 | else | |
1875 | get_tcp6_sock(seq, v, st->num); | |
1da177e4 LT |
1876 | break; |
1877 | case TCP_SEQ_STATE_OPENREQ: | |
1878 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1879 | break; | |
1da177e4 LT |
1880 | } |
1881 | out: | |
1882 | return 0; | |
1883 | } | |
1884 | ||
73cb88ec AV |
1885 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1886 | .owner = THIS_MODULE, | |
1887 | .open = tcp_seq_open, | |
1888 | .read = seq_read, | |
1889 | .llseek = seq_lseek, | |
1890 | .release = seq_release_net | |
1891 | }; | |
1892 | ||
1da177e4 | 1893 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1894 | .name = "tcp6", |
1895 | .family = AF_INET6, | |
73cb88ec | 1896 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1897 | .seq_ops = { |
1898 | .show = tcp6_seq_show, | |
1899 | }, | |
1da177e4 LT |
1900 | }; |
1901 | ||
2c8c1e72 | 1902 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1903 | { |
6f8b13bc | 1904 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1905 | } |
1906 | ||
6f8b13bc | 1907 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1908 | { |
6f8b13bc | 1909 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1910 | } |
1911 | #endif | |
1912 | ||
f77d6021 ED |
1913 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1914 | { | |
1915 | struct inet_sock *inet = inet_sk(sk); | |
1916 | ||
1917 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1918 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1919 | ||
1920 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1921 | memset(&inet->pinet6 + 1, 0, size); | |
1922 | } | |
1923 | ||
1da177e4 LT |
1924 | struct proto tcpv6_prot = { |
1925 | .name = "TCPv6", | |
1926 | .owner = THIS_MODULE, | |
1927 | .close = tcp_close, | |
1928 | .connect = tcp_v6_connect, | |
1929 | .disconnect = tcp_disconnect, | |
463c84b9 | 1930 | .accept = inet_csk_accept, |
1da177e4 LT |
1931 | .ioctl = tcp_ioctl, |
1932 | .init = tcp_v6_init_sock, | |
1933 | .destroy = tcp_v6_destroy_sock, | |
1934 | .shutdown = tcp_shutdown, | |
1935 | .setsockopt = tcp_setsockopt, | |
1936 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1937 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1938 | .sendmsg = tcp_sendmsg, |
1939 | .sendpage = tcp_sendpage, | |
1da177e4 | 1940 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1941 | .release_cb = tcp_release_cb, |
563d34d0 | 1942 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 | 1943 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1944 | .unhash = inet_unhash, |
1945 | .get_port = inet_csk_get_port, | |
1da177e4 | 1946 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 1947 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 LT |
1948 | .sockets_allocated = &tcp_sockets_allocated, |
1949 | .memory_allocated = &tcp_memory_allocated, | |
1950 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1951 | .orphan_count = &tcp_orphan_count, |
a4fe34bf | 1952 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
1953 | .sysctl_wmem = sysctl_tcp_wmem, |
1954 | .sysctl_rmem = sysctl_tcp_rmem, | |
1955 | .max_header = MAX_TCP_HEADER, | |
1956 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1957 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1958 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1959 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1960 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1961 | .no_autobind = true, |
543d9cfe ACM |
1962 | #ifdef CONFIG_COMPAT |
1963 | .compat_setsockopt = compat_tcp_setsockopt, | |
1964 | .compat_getsockopt = compat_tcp_getsockopt, | |
1965 | #endif | |
c255a458 | 1966 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1967 | .proto_cgroup = tcp_proto_cgroup, |
1968 | #endif | |
f77d6021 | 1969 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1970 | }; |
1971 | ||
41135cc8 | 1972 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1973 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1974 | .handler = tcp_v6_rcv, |
1975 | .err_handler = tcp_v6_err, | |
1976 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1977 | }; | |
1978 | ||
1da177e4 LT |
1979 | static struct inet_protosw tcpv6_protosw = { |
1980 | .type = SOCK_STREAM, | |
1981 | .protocol = IPPROTO_TCP, | |
1982 | .prot = &tcpv6_prot, | |
1983 | .ops = &inet6_stream_ops, | |
1da177e4 | 1984 | .no_check = 0, |
d83d8461 ACM |
1985 | .flags = INET_PROTOSW_PERMANENT | |
1986 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1987 | }; |
1988 | ||
2c8c1e72 | 1989 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1990 | { |
5677242f DL |
1991 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1992 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1993 | } |
1994 | ||
2c8c1e72 | 1995 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1996 | { |
5677242f | 1997 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1998 | } |
1999 | ||
2c8c1e72 | 2000 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2001 | { |
2002 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2003 | } |
2004 | ||
2005 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2006 | .init = tcpv6_net_init, |
2007 | .exit = tcpv6_net_exit, | |
2008 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2009 | }; |
2010 | ||
7f4e4868 | 2011 | int __init tcpv6_init(void) |
1da177e4 | 2012 | { |
7f4e4868 DL |
2013 | int ret; |
2014 | ||
3336288a VY |
2015 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
2016 | if (ret) | |
c6b641a4 | 2017 | goto out; |
3336288a | 2018 | |
1da177e4 | 2019 | /* register inet6 protocol */ |
7f4e4868 DL |
2020 | ret = inet6_register_protosw(&tcpv6_protosw); |
2021 | if (ret) | |
2022 | goto out_tcpv6_protocol; | |
2023 | ||
93ec926b | 2024 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2025 | if (ret) |
2026 | goto out_tcpv6_protosw; | |
2027 | out: | |
2028 | return ret; | |
ae0f7d5f | 2029 | |
7f4e4868 DL |
2030 | out_tcpv6_protosw: |
2031 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2032 | out_tcpv6_protocol: |
2033 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2034 | goto out; |
2035 | } | |
2036 | ||
09f7709f | 2037 | void tcpv6_exit(void) |
7f4e4868 | 2038 | { |
93ec926b | 2039 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2040 | inet6_unregister_protosw(&tcpv6_protosw); |
2041 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2042 | } |