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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> |
1da177e4 LT |
65 | |
66 | #include <asm/uaccess.h> | |
67 | ||
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); | |
8ad50d96 | 79 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 ED |
80 | const struct in6_addr *saddr, |
81 | const struct in6_addr *daddr); | |
1da177e4 | 82 | |
3b401a81 SH |
83 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
84 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 85 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
86 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
87 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
88 | #else |
89 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 90 | const struct in6_addr *addr) |
9501f972 YH |
91 | { |
92 | return NULL; | |
93 | } | |
a928630a | 94 | #endif |
1da177e4 | 95 | |
1da177e4 LT |
96 | static void tcp_v6_hash(struct sock *sk) |
97 | { | |
98 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 99 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
100 | tcp_prot.hash(sk); |
101 | return; | |
102 | } | |
103 | local_bh_disable(); | |
9327f705 | 104 | __inet6_hash(sk, NULL); |
1da177e4 LT |
105 | local_bh_enable(); |
106 | } | |
107 | } | |
108 | ||
684f2176 | 109 | static __inline__ __sum16 tcp_v6_check(int len, |
b71d1d42 ED |
110 | const struct in6_addr *saddr, |
111 | const struct in6_addr *daddr, | |
868c86bc | 112 | __wsum base) |
1da177e4 LT |
113 | { |
114 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
115 | } | |
116 | ||
a94f723d | 117 | static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
1da177e4 | 118 | { |
0660e03f ACM |
119 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
120 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
121 | tcp_hdr(skb)->dest, |
122 | tcp_hdr(skb)->source); | |
1da177e4 LT |
123 | } |
124 | ||
1ab1457c | 125 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
126 | int addr_len) |
127 | { | |
128 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 129 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 130 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
131 | struct ipv6_pinfo *np = inet6_sk(sk); |
132 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 133 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 134 | struct rt6_info *rt; |
4c9483b2 | 135 | struct flowi6 fl6; |
1da177e4 LT |
136 | struct dst_entry *dst; |
137 | int addr_type; | |
138 | int err; | |
139 | ||
1ab1457c | 140 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
141 | return -EINVAL; |
142 | ||
1ab1457c | 143 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 144 | return -EAFNOSUPPORT; |
1da177e4 | 145 | |
4c9483b2 | 146 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
147 | |
148 | if (np->sndflow) { | |
4c9483b2 DM |
149 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
150 | IP6_ECN_flow_init(fl6.flowlabel); | |
151 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 152 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 153 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
154 | if (flowlabel == NULL) |
155 | return -EINVAL; | |
156 | ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); | |
157 | fl6_sock_release(flowlabel); | |
158 | } | |
159 | } | |
160 | ||
161 | /* | |
1ab1457c YH |
162 | * connect() to INADDR_ANY means loopback (BSD'ism). |
163 | */ | |
164 | ||
165 | if(ipv6_addr_any(&usin->sin6_addr)) | |
166 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
167 | |
168 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
169 | ||
170 | if(addr_type & IPV6_ADDR_MULTICAST) | |
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 && | |
192 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
193 | tp->rx_opt.ts_recent = 0; | |
194 | tp->rx_opt.ts_recent_stamp = 0; | |
195 | tp->write_seq = 0; | |
196 | } | |
197 | ||
198 | ipv6_addr_copy(&np->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, | |
237 | &np->rcv_saddr); | |
1da177e4 LT |
238 | } |
239 | ||
240 | return err; | |
241 | } | |
242 | ||
243 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
244 | saddr = &np->rcv_saddr; | |
245 | ||
4c9483b2 DM |
246 | fl6.flowi6_proto = IPPROTO_TCP; |
247 | ipv6_addr_copy(&fl6.daddr, &np->daddr); | |
248 | ipv6_addr_copy(&fl6.saddr, | |
1da177e4 | 249 | (saddr ? saddr : &np->saddr)); |
4c9483b2 DM |
250 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
251 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
252 | fl6.fl6_dport = usin->sin6_port; |
253 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 254 | |
4c9483b2 | 255 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 256 | |
4c9483b2 | 257 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 258 | |
4c9483b2 | 259 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
260 | if (IS_ERR(dst)) { |
261 | err = PTR_ERR(dst); | |
1da177e4 | 262 | goto failure; |
14e50e57 | 263 | } |
1da177e4 LT |
264 | |
265 | if (saddr == NULL) { | |
4c9483b2 | 266 | saddr = &fl6.saddr; |
1da177e4 LT |
267 | ipv6_addr_copy(&np->rcv_saddr, saddr); |
268 | } | |
269 | ||
270 | /* set the source address */ | |
271 | ipv6_addr_copy(&np->saddr, saddr); | |
c720c7e8 | 272 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 273 | |
f83ef8c0 | 274 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 275 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 276 | |
493f377d DM |
277 | rt = (struct rt6_info *) dst; |
278 | if (tcp_death_row.sysctl_tw_recycle && | |
279 | !tp->rx_opt.ts_recent_stamp && | |
280 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) { | |
281 | struct inet_peer *peer = rt6_get_peer(rt); | |
282 | /* | |
283 | * VJ's idea. We save last timestamp seen from | |
284 | * the destination in peer table, when entering state | |
285 | * TIME-WAIT * and initialize rx_opt.ts_recent from it, | |
286 | * when trying new connection. | |
287 | */ | |
288 | if (peer) { | |
289 | inet_peer_refcheck(peer); | |
290 | if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) { | |
291 | tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp; | |
292 | tp->rx_opt.ts_recent = peer->tcp_ts; | |
293 | } | |
294 | } | |
295 | } | |
296 | ||
d83d8461 | 297 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 298 | if (np->opt) |
d83d8461 ACM |
299 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
300 | np->opt->opt_nflen); | |
1da177e4 LT |
301 | |
302 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
303 | ||
c720c7e8 | 304 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
305 | |
306 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 307 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
308 | if (err) |
309 | goto late_failure; | |
310 | ||
311 | if (!tp->write_seq) | |
312 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, | |
313 | np->daddr.s6_addr32, | |
c720c7e8 ED |
314 | inet->inet_sport, |
315 | inet->inet_dport); | |
1da177e4 LT |
316 | |
317 | err = tcp_connect(sk); | |
318 | if (err) | |
319 | goto late_failure; | |
320 | ||
321 | return 0; | |
322 | ||
323 | late_failure: | |
324 | tcp_set_state(sk, TCP_CLOSE); | |
325 | __sk_dst_reset(sk); | |
326 | failure: | |
c720c7e8 | 327 | inet->inet_dport = 0; |
1da177e4 LT |
328 | sk->sk_route_caps = 0; |
329 | return err; | |
330 | } | |
331 | ||
332 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
d5fdd6ba | 333 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 334 | { |
b71d1d42 | 335 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 336 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
337 | struct ipv6_pinfo *np; |
338 | struct sock *sk; | |
339 | int err; | |
1ab1457c | 340 | struct tcp_sock *tp; |
1da177e4 | 341 | __u32 seq; |
ca12a1a4 | 342 | struct net *net = dev_net(skb->dev); |
1da177e4 | 343 | |
ca12a1a4 | 344 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 345 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
346 | |
347 | if (sk == NULL) { | |
e41b5368 DL |
348 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
349 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
350 | return; |
351 | } | |
352 | ||
353 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 354 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
355 | return; |
356 | } | |
357 | ||
358 | bh_lock_sock(sk); | |
359 | if (sock_owned_by_user(sk)) | |
de0744af | 360 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
361 | |
362 | if (sk->sk_state == TCP_CLOSE) | |
363 | goto out; | |
364 | ||
e802af9c SH |
365 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
366 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
367 | goto out; | |
368 | } | |
369 | ||
1da177e4 | 370 | tp = tcp_sk(sk); |
1ab1457c | 371 | seq = ntohl(th->seq); |
1da177e4 LT |
372 | if (sk->sk_state != TCP_LISTEN && |
373 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 374 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
375 | goto out; |
376 | } | |
377 | ||
378 | np = inet6_sk(sk); | |
379 | ||
380 | if (type == ICMPV6_PKT_TOOBIG) { | |
68d0c6d3 | 381 | struct dst_entry *dst; |
1da177e4 LT |
382 | |
383 | if (sock_owned_by_user(sk)) | |
384 | goto out; | |
385 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
386 | goto out; | |
387 | ||
388 | /* icmp should have updated the destination cache entry */ | |
389 | dst = __sk_dst_check(sk, np->dst_cookie); | |
390 | ||
391 | if (dst == NULL) { | |
392 | struct inet_sock *inet = inet_sk(sk); | |
4c9483b2 | 393 | struct flowi6 fl6; |
1da177e4 LT |
394 | |
395 | /* BUGGG_FUTURE: Again, it is not clear how | |
396 | to handle rthdr case. Ignore this complexity | |
397 | for now. | |
398 | */ | |
4c9483b2 DM |
399 | memset(&fl6, 0, sizeof(fl6)); |
400 | fl6.flowi6_proto = IPPROTO_TCP; | |
401 | ipv6_addr_copy(&fl6.daddr, &np->daddr); | |
402 | ipv6_addr_copy(&fl6.saddr, &np->saddr); | |
403 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
404 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
405 | fl6.fl6_dport = inet->inet_dport; |
406 | fl6.fl6_sport = inet->inet_sport; | |
4c9483b2 DM |
407 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
408 | ||
409 | dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false); | |
68d0c6d3 DM |
410 | if (IS_ERR(dst)) { |
411 | sk->sk_err_soft = -PTR_ERR(dst); | |
1da177e4 LT |
412 | goto out; |
413 | } | |
414 | ||
415 | } else | |
416 | dst_hold(dst); | |
417 | ||
d83d8461 | 418 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
1da177e4 LT |
419 | tcp_sync_mss(sk, dst_mtu(dst)); |
420 | tcp_simple_retransmit(sk); | |
421 | } /* else let the usual retransmit timer handle it */ | |
422 | dst_release(dst); | |
423 | goto out; | |
424 | } | |
425 | ||
426 | icmpv6_err_convert(type, code, &err); | |
427 | ||
60236fdd | 428 | /* Might be for an request_sock */ |
1da177e4 | 429 | switch (sk->sk_state) { |
60236fdd | 430 | struct request_sock *req, **prev; |
1da177e4 LT |
431 | case TCP_LISTEN: |
432 | if (sock_owned_by_user(sk)) | |
433 | goto out; | |
434 | ||
8129765a ACM |
435 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
436 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
437 | if (!req) |
438 | goto out; | |
439 | ||
440 | /* ICMPs are not backlogged, hence we cannot get | |
441 | * an established socket here. | |
442 | */ | |
547b792c | 443 | WARN_ON(req->sk != NULL); |
1da177e4 | 444 | |
2e6599cb | 445 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 446 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
447 | goto out; |
448 | } | |
449 | ||
463c84b9 | 450 | inet_csk_reqsk_queue_drop(sk, req, prev); |
1da177e4 LT |
451 | goto out; |
452 | ||
453 | case TCP_SYN_SENT: | |
454 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 455 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 456 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
457 | sk->sk_err = err; |
458 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
459 | ||
460 | tcp_done(sk); | |
461 | } else | |
462 | sk->sk_err_soft = err; | |
463 | goto out; | |
464 | } | |
465 | ||
466 | if (!sock_owned_by_user(sk) && np->recverr) { | |
467 | sk->sk_err = err; | |
468 | sk->sk_error_report(sk); | |
469 | } else | |
470 | sk->sk_err_soft = err; | |
471 | ||
472 | out: | |
473 | bh_unlock_sock(sk); | |
474 | sock_put(sk); | |
475 | } | |
476 | ||
477 | ||
e6b4d113 WAS |
478 | static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req, |
479 | struct request_values *rvp) | |
1da177e4 | 480 | { |
ca304b61 | 481 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
482 | struct ipv6_pinfo *np = inet6_sk(sk); |
483 | struct sk_buff * skb; | |
484 | struct ipv6_txoptions *opt = NULL; | |
20c59de2 | 485 | struct in6_addr * final_p, final; |
4c9483b2 | 486 | struct flowi6 fl6; |
fd80eb94 | 487 | struct dst_entry *dst; |
68d0c6d3 | 488 | int err; |
1da177e4 | 489 | |
4c9483b2 DM |
490 | memset(&fl6, 0, sizeof(fl6)); |
491 | fl6.flowi6_proto = IPPROTO_TCP; | |
492 | ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr); | |
493 | ipv6_addr_copy(&fl6.saddr, &treq->loc_addr); | |
494 | fl6.flowlabel = 0; | |
495 | fl6.flowi6_oif = treq->iif; | |
496 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
497 | fl6.fl6_dport = inet_rsk(req)->rmt_port; |
498 | fl6.fl6_sport = inet_rsk(req)->loc_port; | |
4c9483b2 | 499 | security_req_classify_flow(req, flowi6_to_flowi(&fl6)); |
1da177e4 | 500 | |
fd80eb94 | 501 | opt = np->opt; |
4c9483b2 | 502 | final_p = fl6_update_dst(&fl6, opt, &final); |
1da177e4 | 503 | |
4c9483b2 | 504 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false); |
68d0c6d3 DM |
505 | if (IS_ERR(dst)) { |
506 | err = PTR_ERR(dst); | |
738faca3 | 507 | dst = NULL; |
fd80eb94 | 508 | goto done; |
68d0c6d3 | 509 | } |
e6b4d113 | 510 | skb = tcp_make_synack(sk, dst, req, rvp); |
68d0c6d3 | 511 | err = -ENOMEM; |
1da177e4 | 512 | if (skb) { |
8ad50d96 | 513 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 514 | |
4c9483b2 DM |
515 | ipv6_addr_copy(&fl6.daddr, &treq->rmt_addr); |
516 | err = ip6_xmit(sk, skb, &fl6, opt); | |
b9df3cb8 | 517 | err = net_xmit_eval(err); |
1da177e4 LT |
518 | } |
519 | ||
520 | done: | |
1ab1457c | 521 | if (opt && opt != np->opt) |
1da177e4 | 522 | sock_kfree_s(sk, opt, opt->tot_len); |
78b91042 | 523 | dst_release(dst); |
1da177e4 LT |
524 | return err; |
525 | } | |
526 | ||
72659ecc OP |
527 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req, |
528 | struct request_values *rvp) | |
529 | { | |
530 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
531 | return tcp_v6_send_synack(sk, req, rvp); | |
532 | } | |
533 | ||
60236fdd | 534 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 535 | { |
800d55f1 | 536 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
537 | } |
538 | ||
cfb6eeb4 YH |
539 | #ifdef CONFIG_TCP_MD5SIG |
540 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 541 | const struct in6_addr *addr) |
cfb6eeb4 YH |
542 | { |
543 | struct tcp_sock *tp = tcp_sk(sk); | |
544 | int i; | |
545 | ||
546 | BUG_ON(tp == NULL); | |
547 | ||
548 | if (!tp->md5sig_info || !tp->md5sig_info->entries6) | |
549 | return NULL; | |
550 | ||
551 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 552 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
f8ab18d2 | 553 | return &tp->md5sig_info->keys6[i].base; |
cfb6eeb4 YH |
554 | } |
555 | return NULL; | |
556 | } | |
557 | ||
558 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
559 | struct sock *addr_sk) | |
560 | { | |
561 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
562 | } | |
563 | ||
564 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
565 | struct request_sock *req) | |
566 | { | |
567 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
568 | } | |
569 | ||
b71d1d42 | 570 | static int tcp_v6_md5_do_add(struct sock *sk, const struct in6_addr *peer, |
cfb6eeb4 YH |
571 | char *newkey, u8 newkeylen) |
572 | { | |
573 | /* Add key to the list */ | |
b0a713e9 | 574 | struct tcp_md5sig_key *key; |
cfb6eeb4 YH |
575 | struct tcp_sock *tp = tcp_sk(sk); |
576 | struct tcp6_md5sig_key *keys; | |
577 | ||
b0a713e9 | 578 | key = tcp_v6_md5_do_lookup(sk, peer); |
cfb6eeb4 YH |
579 | if (key) { |
580 | /* modify existing entry - just update that one */ | |
b0a713e9 MD |
581 | kfree(key->key); |
582 | key->key = newkey; | |
583 | key->keylen = newkeylen; | |
cfb6eeb4 YH |
584 | } else { |
585 | /* reallocate new list if current one is full. */ | |
586 | if (!tp->md5sig_info) { | |
587 | tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); | |
588 | if (!tp->md5sig_info) { | |
589 | kfree(newkey); | |
590 | return -ENOMEM; | |
591 | } | |
a465419b | 592 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 | 593 | } |
aa133076 | 594 | if (tcp_alloc_md5sig_pool(sk) == NULL) { |
aacbe8c8 YH |
595 | kfree(newkey); |
596 | return -ENOMEM; | |
597 | } | |
cfb6eeb4 YH |
598 | if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
599 | keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * | |
600 | (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); | |
601 | ||
602 | if (!keys) { | |
603 | tcp_free_md5sig_pool(); | |
604 | kfree(newkey); | |
605 | return -ENOMEM; | |
606 | } | |
607 | ||
608 | if (tp->md5sig_info->entries6) | |
609 | memmove(keys, tp->md5sig_info->keys6, | |
610 | (sizeof (tp->md5sig_info->keys6[0]) * | |
611 | tp->md5sig_info->entries6)); | |
612 | ||
613 | kfree(tp->md5sig_info->keys6); | |
614 | tp->md5sig_info->keys6 = keys; | |
615 | tp->md5sig_info->alloced6++; | |
616 | } | |
617 | ||
618 | ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, | |
619 | peer); | |
f8ab18d2 DM |
620 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
621 | tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; | |
cfb6eeb4 YH |
622 | |
623 | tp->md5sig_info->entries6++; | |
624 | } | |
625 | return 0; | |
626 | } | |
627 | ||
628 | static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, | |
629 | u8 *newkey, __u8 newkeylen) | |
630 | { | |
631 | return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, | |
632 | newkey, newkeylen); | |
633 | } | |
634 | ||
b71d1d42 | 635 | static int tcp_v6_md5_do_del(struct sock *sk, const struct in6_addr *peer) |
cfb6eeb4 YH |
636 | { |
637 | struct tcp_sock *tp = tcp_sk(sk); | |
638 | int i; | |
639 | ||
640 | for (i = 0; i < tp->md5sig_info->entries6; i++) { | |
caad295f | 641 | if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
cfb6eeb4 | 642 | /* Free the key */ |
f8ab18d2 | 643 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
644 | tp->md5sig_info->entries6--; |
645 | ||
646 | if (tp->md5sig_info->entries6 == 0) { | |
647 | kfree(tp->md5sig_info->keys6); | |
648 | tp->md5sig_info->keys6 = NULL; | |
ca983cef | 649 | tp->md5sig_info->alloced6 = 0; |
cfb6eeb4 YH |
650 | } else { |
651 | /* shrink the database */ | |
652 | if (tp->md5sig_info->entries6 != i) | |
653 | memmove(&tp->md5sig_info->keys6[i], | |
654 | &tp->md5sig_info->keys6[i+1], | |
655 | (tp->md5sig_info->entries6 - i) | |
656 | * sizeof (tp->md5sig_info->keys6[0])); | |
657 | } | |
77adefdc YH |
658 | tcp_free_md5sig_pool(); |
659 | return 0; | |
cfb6eeb4 YH |
660 | } |
661 | } | |
662 | return -ENOENT; | |
663 | } | |
664 | ||
665 | static void tcp_v6_clear_md5_list (struct sock *sk) | |
666 | { | |
667 | struct tcp_sock *tp = tcp_sk(sk); | |
668 | int i; | |
669 | ||
670 | if (tp->md5sig_info->entries6) { | |
671 | for (i = 0; i < tp->md5sig_info->entries6; i++) | |
f8ab18d2 | 672 | kfree(tp->md5sig_info->keys6[i].base.key); |
cfb6eeb4 YH |
673 | tp->md5sig_info->entries6 = 0; |
674 | tcp_free_md5sig_pool(); | |
675 | } | |
676 | ||
677 | kfree(tp->md5sig_info->keys6); | |
678 | tp->md5sig_info->keys6 = NULL; | |
679 | tp->md5sig_info->alloced6 = 0; | |
680 | ||
681 | if (tp->md5sig_info->entries4) { | |
682 | for (i = 0; i < tp->md5sig_info->entries4; i++) | |
f8ab18d2 | 683 | kfree(tp->md5sig_info->keys4[i].base.key); |
cfb6eeb4 YH |
684 | tp->md5sig_info->entries4 = 0; |
685 | tcp_free_md5sig_pool(); | |
686 | } | |
687 | ||
688 | kfree(tp->md5sig_info->keys4); | |
689 | tp->md5sig_info->keys4 = NULL; | |
690 | tp->md5sig_info->alloced4 = 0; | |
691 | } | |
692 | ||
693 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, | |
694 | int optlen) | |
695 | { | |
696 | struct tcp_md5sig cmd; | |
697 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
698 | u8 *newkey; | |
699 | ||
700 | if (optlen < sizeof(cmd)) | |
701 | return -EINVAL; | |
702 | ||
703 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
704 | return -EFAULT; | |
705 | ||
706 | if (sin6->sin6_family != AF_INET6) | |
707 | return -EINVAL; | |
708 | ||
709 | if (!cmd.tcpm_keylen) { | |
710 | if (!tcp_sk(sk)->md5sig_info) | |
711 | return -ENOENT; | |
e773e4fa | 712 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
cfb6eeb4 YH |
713 | return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
714 | return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); | |
715 | } | |
716 | ||
717 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
718 | return -EINVAL; | |
719 | ||
720 | if (!tcp_sk(sk)->md5sig_info) { | |
721 | struct tcp_sock *tp = tcp_sk(sk); | |
722 | struct tcp_md5sig_info *p; | |
723 | ||
724 | p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); | |
725 | if (!p) | |
726 | return -ENOMEM; | |
727 | ||
728 | tp->md5sig_info = p; | |
a465419b | 729 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
730 | } |
731 | ||
af879cc7 | 732 | newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
cfb6eeb4 YH |
733 | if (!newkey) |
734 | return -ENOMEM; | |
e773e4fa | 735 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
cfb6eeb4 YH |
736 | return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
737 | newkey, cmd.tcpm_keylen); | |
738 | } | |
739 | return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); | |
740 | } | |
741 | ||
49a72dfb | 742 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
743 | const struct in6_addr *daddr, |
744 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 745 | { |
cfb6eeb4 | 746 | struct tcp6_pseudohdr *bp; |
49a72dfb | 747 | struct scatterlist sg; |
8d26d76d | 748 | |
cfb6eeb4 | 749 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 YH |
750 | /* 1. TCP pseudo-header (RFC2460) */ |
751 | ipv6_addr_copy(&bp->saddr, saddr); | |
752 | ipv6_addr_copy(&bp->daddr, daddr); | |
49a72dfb | 753 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 754 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 755 | |
49a72dfb AL |
756 | sg_init_one(&sg, bp, sizeof(*bp)); |
757 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
758 | } | |
c7da57a1 | 759 | |
49a72dfb | 760 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 761 | const struct in6_addr *daddr, struct in6_addr *saddr, |
49a72dfb AL |
762 | struct tcphdr *th) |
763 | { | |
764 | struct tcp_md5sig_pool *hp; | |
765 | struct hash_desc *desc; | |
766 | ||
767 | hp = tcp_get_md5sig_pool(); | |
768 | if (!hp) | |
769 | goto clear_hash_noput; | |
770 | desc = &hp->md5_desc; | |
771 | ||
772 | if (crypto_hash_init(desc)) | |
773 | goto clear_hash; | |
774 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
775 | goto clear_hash; | |
776 | if (tcp_md5_hash_header(hp, th)) | |
777 | goto clear_hash; | |
778 | if (tcp_md5_hash_key(hp, key)) | |
779 | goto clear_hash; | |
780 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 781 | goto clear_hash; |
cfb6eeb4 | 782 | |
cfb6eeb4 | 783 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 784 | return 0; |
49a72dfb | 785 | |
cfb6eeb4 YH |
786 | clear_hash: |
787 | tcp_put_md5sig_pool(); | |
788 | clear_hash_noput: | |
789 | memset(md5_hash, 0, 16); | |
49a72dfb | 790 | return 1; |
cfb6eeb4 YH |
791 | } |
792 | ||
49a72dfb AL |
793 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
794 | struct sock *sk, struct request_sock *req, | |
795 | struct sk_buff *skb) | |
cfb6eeb4 | 796 | { |
b71d1d42 | 797 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
798 | struct tcp_md5sig_pool *hp; |
799 | struct hash_desc *desc; | |
800 | struct tcphdr *th = tcp_hdr(skb); | |
cfb6eeb4 YH |
801 | |
802 | if (sk) { | |
803 | saddr = &inet6_sk(sk)->saddr; | |
804 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 805 | } else if (req) { |
cfb6eeb4 YH |
806 | saddr = &inet6_rsk(req)->loc_addr; |
807 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 808 | } else { |
b71d1d42 | 809 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
810 | saddr = &ip6h->saddr; |
811 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 812 | } |
49a72dfb AL |
813 | |
814 | hp = tcp_get_md5sig_pool(); | |
815 | if (!hp) | |
816 | goto clear_hash_noput; | |
817 | desc = &hp->md5_desc; | |
818 | ||
819 | if (crypto_hash_init(desc)) | |
820 | goto clear_hash; | |
821 | ||
822 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
823 | goto clear_hash; | |
824 | if (tcp_md5_hash_header(hp, th)) | |
825 | goto clear_hash; | |
826 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
827 | goto clear_hash; | |
828 | if (tcp_md5_hash_key(hp, key)) | |
829 | goto clear_hash; | |
830 | if (crypto_hash_final(desc, md5_hash)) | |
831 | goto clear_hash; | |
832 | ||
833 | tcp_put_md5sig_pool(); | |
834 | return 0; | |
835 | ||
836 | clear_hash: | |
837 | tcp_put_md5sig_pool(); | |
838 | clear_hash_noput: | |
839 | memset(md5_hash, 0, 16); | |
840 | return 1; | |
cfb6eeb4 YH |
841 | } |
842 | ||
843 | static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) | |
844 | { | |
845 | __u8 *hash_location = NULL; | |
846 | struct tcp_md5sig_key *hash_expected; | |
b71d1d42 | 847 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
aa8223c7 | 848 | struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 849 | int genhash; |
cfb6eeb4 YH |
850 | u8 newhash[16]; |
851 | ||
852 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 853 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 854 | |
785957d3 DM |
855 | /* We've parsed the options - do we have a hash? */ |
856 | if (!hash_expected && !hash_location) | |
857 | return 0; | |
858 | ||
859 | if (hash_expected && !hash_location) { | |
860 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
861 | return 1; |
862 | } | |
863 | ||
785957d3 DM |
864 | if (!hash_expected && hash_location) { |
865 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
866 | return 1; |
867 | } | |
868 | ||
869 | /* check the signature */ | |
49a72dfb AL |
870 | genhash = tcp_v6_md5_hash_skb(newhash, |
871 | hash_expected, | |
872 | NULL, NULL, skb); | |
873 | ||
cfb6eeb4 YH |
874 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
875 | if (net_ratelimit()) { | |
5856b606 | 876 | printk(KERN_INFO "MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
cfb6eeb4 | 877 | genhash ? "failed" : "mismatch", |
0c6ce78a HH |
878 | &ip6h->saddr, ntohs(th->source), |
879 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
880 | } |
881 | return 1; | |
882 | } | |
883 | return 0; | |
884 | } | |
885 | #endif | |
886 | ||
c6aefafb | 887 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 888 | .family = AF_INET6, |
2e6599cb | 889 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 890 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
891 | .send_ack = tcp_v6_reqsk_send_ack, |
892 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
893 | .send_reset = tcp_v6_send_reset, |
894 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
895 | }; |
896 | ||
cfb6eeb4 | 897 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 898 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 899 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 900 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 901 | }; |
b6332e6c | 902 | #endif |
cfb6eeb4 | 903 | |
8ad50d96 | 904 | static void __tcp_v6_send_check(struct sk_buff *skb, |
b71d1d42 | 905 | const struct in6_addr *saddr, const struct in6_addr *daddr) |
1da177e4 | 906 | { |
aa8223c7 | 907 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 908 | |
84fa7933 | 909 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
8ad50d96 | 910 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
663ead3b | 911 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 912 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 913 | } else { |
8ad50d96 HX |
914 | th->check = tcp_v6_check(skb->len, saddr, daddr, |
915 | csum_partial(th, th->doff << 2, | |
916 | skb->csum)); | |
1da177e4 LT |
917 | } |
918 | } | |
919 | ||
bb296246 | 920 | static void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
8ad50d96 HX |
921 | { |
922 | struct ipv6_pinfo *np = inet6_sk(sk); | |
923 | ||
924 | __tcp_v6_send_check(skb, &np->saddr, &np->daddr); | |
925 | } | |
926 | ||
a430a43d HX |
927 | static int tcp_v6_gso_send_check(struct sk_buff *skb) |
928 | { | |
b71d1d42 | 929 | const struct ipv6hdr *ipv6h; |
a430a43d HX |
930 | struct tcphdr *th; |
931 | ||
932 | if (!pskb_may_pull(skb, sizeof(*th))) | |
933 | return -EINVAL; | |
934 | ||
0660e03f | 935 | ipv6h = ipv6_hdr(skb); |
aa8223c7 | 936 | th = tcp_hdr(skb); |
a430a43d HX |
937 | |
938 | th->check = 0; | |
84fa7933 | 939 | skb->ip_summed = CHECKSUM_PARTIAL; |
8ad50d96 | 940 | __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr); |
a430a43d HX |
941 | return 0; |
942 | } | |
1da177e4 | 943 | |
36990673 HX |
944 | static struct sk_buff **tcp6_gro_receive(struct sk_buff **head, |
945 | struct sk_buff *skb) | |
684f2176 | 946 | { |
b71d1d42 | 947 | const struct ipv6hdr *iph = skb_gro_network_header(skb); |
684f2176 HX |
948 | |
949 | switch (skb->ip_summed) { | |
950 | case CHECKSUM_COMPLETE: | |
86911732 | 951 | if (!tcp_v6_check(skb_gro_len(skb), &iph->saddr, &iph->daddr, |
684f2176 HX |
952 | skb->csum)) { |
953 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
954 | break; | |
955 | } | |
956 | ||
957 | /* fall through */ | |
958 | case CHECKSUM_NONE: | |
959 | NAPI_GRO_CB(skb)->flush = 1; | |
960 | return NULL; | |
961 | } | |
962 | ||
963 | return tcp_gro_receive(head, skb); | |
964 | } | |
684f2176 | 965 | |
36990673 | 966 | static int tcp6_gro_complete(struct sk_buff *skb) |
684f2176 | 967 | { |
b71d1d42 | 968 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
684f2176 HX |
969 | struct tcphdr *th = tcp_hdr(skb); |
970 | ||
971 | th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb), | |
972 | &iph->saddr, &iph->daddr, 0); | |
973 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
974 | ||
975 | return tcp_gro_complete(skb); | |
976 | } | |
684f2176 | 977 | |
626e264d IJ |
978 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
979 | u32 ts, struct tcp_md5sig_key *key, int rst) | |
1da177e4 | 980 | { |
aa8223c7 | 981 | struct tcphdr *th = tcp_hdr(skb), *t1; |
1da177e4 | 982 | struct sk_buff *buff; |
4c9483b2 | 983 | struct flowi6 fl6; |
adf30907 | 984 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 985 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 986 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 987 | struct dst_entry *dst; |
81ada62d | 988 | __be32 *topt; |
1da177e4 | 989 | |
626e264d IJ |
990 | if (ts) |
991 | tot_len += TCPOLEN_TSTAMP_ALIGNED; | |
cfb6eeb4 | 992 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
993 | if (key) |
994 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
995 | #endif | |
996 | ||
cfb6eeb4 | 997 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 998 | GFP_ATOMIC); |
1ab1457c YH |
999 | if (buff == NULL) |
1000 | return; | |
1da177e4 | 1001 | |
cfb6eeb4 | 1002 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 1003 | |
cfb6eeb4 | 1004 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 1005 | skb_reset_transport_header(buff); |
1da177e4 LT |
1006 | |
1007 | /* Swap the send and the receive. */ | |
1008 | memset(t1, 0, sizeof(*t1)); | |
1009 | t1->dest = th->source; | |
1010 | t1->source = th->dest; | |
cfb6eeb4 | 1011 | t1->doff = tot_len / 4; |
626e264d IJ |
1012 | t1->seq = htonl(seq); |
1013 | t1->ack_seq = htonl(ack); | |
1014 | t1->ack = !rst || !th->ack; | |
1015 | t1->rst = rst; | |
1016 | t1->window = htons(win); | |
1da177e4 | 1017 | |
81ada62d IJ |
1018 | topt = (__be32 *)(t1 + 1); |
1019 | ||
626e264d IJ |
1020 | if (ts) { |
1021 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | | |
1022 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
1023 | *topt++ = htonl(tcp_time_stamp); | |
1024 | *topt++ = htonl(ts); | |
1025 | } | |
1026 | ||
cfb6eeb4 YH |
1027 | #ifdef CONFIG_TCP_MD5SIG |
1028 | if (key) { | |
81ada62d IJ |
1029 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
1030 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
1031 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
1032 | &ipv6_hdr(skb)->saddr, |
1033 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
1034 | } |
1035 | #endif | |
1036 | ||
4c9483b2 DM |
1037 | memset(&fl6, 0, sizeof(fl6)); |
1038 | ipv6_addr_copy(&fl6.daddr, &ipv6_hdr(skb)->saddr); | |
1039 | ipv6_addr_copy(&fl6.saddr, &ipv6_hdr(skb)->daddr); | |
1da177e4 | 1040 | |
e5700aff DM |
1041 | buff->ip_summed = CHECKSUM_PARTIAL; |
1042 | buff->csum = 0; | |
1043 | ||
4c9483b2 | 1044 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 1045 | |
4c9483b2 DM |
1046 | fl6.flowi6_proto = IPPROTO_TCP; |
1047 | fl6.flowi6_oif = inet6_iif(skb); | |
1958b856 DM |
1048 | fl6.fl6_dport = t1->dest; |
1049 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 1050 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 1051 | |
c20121ae DL |
1052 | /* Pass a socket to ip6_dst_lookup either it is for RST |
1053 | * Underlying function will use this to retrieve the network | |
1054 | * namespace | |
1055 | */ | |
4c9483b2 | 1056 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
1057 | if (!IS_ERR(dst)) { |
1058 | skb_dst_set(buff, dst); | |
4c9483b2 | 1059 | ip6_xmit(ctl_sk, buff, &fl6, NULL); |
68d0c6d3 DM |
1060 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1061 | if (rst) | |
1062 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
1063 | return; | |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | kfree_skb(buff); | |
1067 | } | |
1068 | ||
626e264d | 1069 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1070 | { |
626e264d IJ |
1071 | struct tcphdr *th = tcp_hdr(skb); |
1072 | u32 seq = 0, ack_seq = 0; | |
fa3e5b4e | 1073 | struct tcp_md5sig_key *key = NULL; |
1da177e4 | 1074 | |
626e264d | 1075 | if (th->rst) |
1da177e4 LT |
1076 | return; |
1077 | ||
626e264d IJ |
1078 | if (!ipv6_unicast_destination(skb)) |
1079 | return; | |
1da177e4 | 1080 | |
cfb6eeb4 | 1081 | #ifdef CONFIG_TCP_MD5SIG |
626e264d IJ |
1082 | if (sk) |
1083 | key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); | |
cfb6eeb4 YH |
1084 | #endif |
1085 | ||
626e264d IJ |
1086 | if (th->ack) |
1087 | seq = ntohl(th->ack_seq); | |
1088 | else | |
1089 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
1090 | (th->doff << 2); | |
1da177e4 | 1091 | |
626e264d IJ |
1092 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, key, 1); |
1093 | } | |
1da177e4 | 1094 | |
626e264d IJ |
1095 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts, |
1096 | struct tcp_md5sig_key *key) | |
1097 | { | |
1098 | tcp_v6_send_response(skb, seq, ack, win, ts, key, 0); | |
1da177e4 LT |
1099 | } |
1100 | ||
1101 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
1102 | { | |
8feaf0c0 | 1103 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 1104 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 1105 | |
9501f972 | 1106 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 1107 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
9501f972 | 1108 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw)); |
1da177e4 | 1109 | |
8feaf0c0 | 1110 | inet_twsk_put(tw); |
1da177e4 LT |
1111 | } |
1112 | ||
6edafaaf GJ |
1113 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
1114 | struct request_sock *req) | |
1da177e4 | 1115 | { |
9501f972 | 1116 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent, |
6edafaaf | 1117 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr)); |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | ||
1121 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
1122 | { | |
60236fdd | 1123 | struct request_sock *req, **prev; |
aa8223c7 | 1124 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
1125 | struct sock *nsk; |
1126 | ||
1127 | /* Find possible connection requests. */ | |
8129765a | 1128 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
1129 | &ipv6_hdr(skb)->saddr, |
1130 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 LT |
1131 | if (req) |
1132 | return tcp_check_req(sk, skb, req, prev); | |
1133 | ||
3b1e0a65 | 1134 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
1135 | &ipv6_hdr(skb)->saddr, th->source, |
1136 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
1137 | |
1138 | if (nsk) { | |
1139 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1140 | bh_lock_sock(nsk); | |
1141 | return nsk; | |
1142 | } | |
9469c7b4 | 1143 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1144 | return NULL; |
1145 | } | |
1146 | ||
c6aefafb | 1147 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 1148 | if (!th->syn) |
c6aefafb | 1149 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
1150 | #endif |
1151 | return sk; | |
1152 | } | |
1153 | ||
1da177e4 LT |
1154 | /* FIXME: this is substantially similar to the ipv4 code. |
1155 | * Can some kind of merge be done? -- erics | |
1156 | */ | |
1157 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
1158 | { | |
4957faad | 1159 | struct tcp_extend_values tmp_ext; |
e6b4d113 | 1160 | struct tcp_options_received tmp_opt; |
4957faad | 1161 | u8 *hash_location; |
e6b4d113 | 1162 | struct request_sock *req; |
ca304b61 | 1163 | struct inet6_request_sock *treq; |
1da177e4 | 1164 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 1165 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 1166 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 1167 | struct dst_entry *dst = NULL; |
c6aefafb | 1168 | int want_cookie = 0; |
1da177e4 LT |
1169 | |
1170 | if (skb->protocol == htons(ETH_P_IP)) | |
1171 | return tcp_v4_conn_request(sk, skb); | |
1172 | ||
1173 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 1174 | goto drop; |
1da177e4 | 1175 | |
463c84b9 | 1176 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
946cedcc ED |
1177 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
1178 | if (!want_cookie) | |
1179 | goto drop; | |
1da177e4 LT |
1180 | } |
1181 | ||
463c84b9 | 1182 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
1da177e4 LT |
1183 | goto drop; |
1184 | ||
ca304b61 | 1185 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
1186 | if (req == NULL) |
1187 | goto drop; | |
1188 | ||
cfb6eeb4 YH |
1189 | #ifdef CONFIG_TCP_MD5SIG |
1190 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
1191 | #endif | |
1192 | ||
1da177e4 LT |
1193 | tcp_clear_options(&tmp_opt); |
1194 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
1195 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
bb5b7c11 | 1196 | tcp_parse_options(skb, &tmp_opt, &hash_location, 0); |
4957faad WAS |
1197 | |
1198 | if (tmp_opt.cookie_plus > 0 && | |
1199 | tmp_opt.saw_tstamp && | |
1200 | !tp->rx_opt.cookie_out_never && | |
1201 | (sysctl_tcp_cookie_size > 0 || | |
1202 | (tp->cookie_values != NULL && | |
1203 | tp->cookie_values->cookie_desired > 0))) { | |
1204 | u8 *c; | |
1205 | u32 *d; | |
1206 | u32 *mess = &tmp_ext.cookie_bakery[COOKIE_DIGEST_WORDS]; | |
1207 | int l = tmp_opt.cookie_plus - TCPOLEN_COOKIE_BASE; | |
1208 | ||
1209 | if (tcp_cookie_generator(&tmp_ext.cookie_bakery[0]) != 0) | |
1210 | goto drop_and_free; | |
1211 | ||
1212 | /* Secret recipe starts with IP addresses */ | |
0eae88f3 | 1213 | d = (__force u32 *)&ipv6_hdr(skb)->daddr.s6_addr32[0]; |
4957faad WAS |
1214 | *mess++ ^= *d++; |
1215 | *mess++ ^= *d++; | |
1216 | *mess++ ^= *d++; | |
1217 | *mess++ ^= *d++; | |
0eae88f3 | 1218 | d = (__force u32 *)&ipv6_hdr(skb)->saddr.s6_addr32[0]; |
4957faad WAS |
1219 | *mess++ ^= *d++; |
1220 | *mess++ ^= *d++; | |
1221 | *mess++ ^= *d++; | |
1222 | *mess++ ^= *d++; | |
1223 | ||
1224 | /* plus variable length Initiator Cookie */ | |
1225 | c = (u8 *)mess; | |
1226 | while (l-- > 0) | |
1227 | *c++ ^= *hash_location++; | |
1da177e4 | 1228 | |
4957faad | 1229 | want_cookie = 0; /* not our kind of cookie */ |
4957faad WAS |
1230 | tmp_ext.cookie_out_never = 0; /* false */ |
1231 | tmp_ext.cookie_plus = tmp_opt.cookie_plus; | |
1232 | } else if (!tp->rx_opt.cookie_in_always) { | |
1233 | /* redundant indications, but ensure initialization. */ | |
1234 | tmp_ext.cookie_out_never = 1; /* true */ | |
1235 | tmp_ext.cookie_plus = 0; | |
1236 | } else { | |
1237 | goto drop_and_free; | |
1238 | } | |
1239 | tmp_ext.cookie_in_always = tp->rx_opt.cookie_in_always; | |
1da177e4 | 1240 | |
4dfc2817 | 1241 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 1242 | tcp_clear_options(&tmp_opt); |
c6aefafb | 1243 | |
1da177e4 LT |
1244 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
1245 | tcp_openreq_init(req, &tmp_opt, skb); | |
1246 | ||
ca304b61 | 1247 | treq = inet6_rsk(req); |
0660e03f ACM |
1248 | ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
1249 | ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); | |
172d69e6 | 1250 | if (!want_cookie || tmp_opt.tstamp_ok) |
c6aefafb GG |
1251 | TCP_ECN_create_request(req, tcp_hdr(skb)); |
1252 | ||
2bbdf389 | 1253 | if (!isn) { |
493f377d DM |
1254 | struct inet_peer *peer = NULL; |
1255 | ||
c6aefafb GG |
1256 | if (ipv6_opt_accepted(sk, skb) || |
1257 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1258 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1259 | atomic_inc(&skb->users); | |
1260 | treq->pktopts = skb; | |
1261 | } | |
1262 | treq->iif = sk->sk_bound_dev_if; | |
1da177e4 | 1263 | |
c6aefafb GG |
1264 | /* So that link locals have meaning */ |
1265 | if (!sk->sk_bound_dev_if && | |
1266 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1267 | treq->iif = inet6_iif(skb); | |
493f377d DM |
1268 | |
1269 | if (want_cookie) { | |
2bbdf389 FW |
1270 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1271 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1272 | goto have_isn; |
1273 | } | |
1274 | ||
1275 | /* VJ's idea. We save last timestamp seen | |
1276 | * from the destination in peer table, when entering | |
1277 | * state TIME-WAIT, and check against it before | |
1278 | * accepting new connection request. | |
1279 | * | |
1280 | * If "isn" is not zero, this request hit alive | |
1281 | * timewait bucket, so that all the necessary checks | |
1282 | * are made in the function processing timewait state. | |
1283 | */ | |
1284 | if (tmp_opt.saw_tstamp && | |
1285 | tcp_death_row.sysctl_tw_recycle && | |
1286 | (dst = inet6_csk_route_req(sk, req)) != NULL && | |
1287 | (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL && | |
7a71ed89 | 1288 | ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6, |
493f377d DM |
1289 | &treq->rmt_addr)) { |
1290 | inet_peer_refcheck(peer); | |
1291 | if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL && | |
1292 | (s32)(peer->tcp_ts - req->ts_recent) > | |
1293 | TCP_PAWS_WINDOW) { | |
1294 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); | |
1295 | goto drop_and_release; | |
1296 | } | |
1297 | } | |
1298 | /* Kill the following clause, if you dislike this way. */ | |
1299 | else if (!sysctl_tcp_syncookies && | |
1300 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1301 | (sysctl_max_syn_backlog >> 2)) && | |
1302 | (!peer || !peer->tcp_ts_stamp) && | |
1303 | (!dst || !dst_metric(dst, RTAX_RTT))) { | |
1304 | /* Without syncookies last quarter of | |
1305 | * backlog is filled with destinations, | |
1306 | * proven to be alive. | |
1307 | * It means that we continue to communicate | |
1308 | * to destinations, already remembered | |
1309 | * to the moment of synflood. | |
1310 | */ | |
1311 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1312 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1313 | goto drop_and_release; | |
2bbdf389 | 1314 | } |
493f377d DM |
1315 | |
1316 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1317 | } |
493f377d | 1318 | have_isn: |
2e6599cb | 1319 | tcp_rsk(req)->snt_isn = isn; |
9ad7c049 | 1320 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
1da177e4 | 1321 | |
4237c75c VY |
1322 | security_inet_conn_request(sk, skb, req); |
1323 | ||
4957faad WAS |
1324 | if (tcp_v6_send_synack(sk, req, |
1325 | (struct request_values *)&tmp_ext) || | |
1326 | want_cookie) | |
e6b4d113 | 1327 | goto drop_and_free; |
1da177e4 | 1328 | |
e6b4d113 WAS |
1329 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1330 | return 0; | |
1da177e4 | 1331 | |
493f377d DM |
1332 | drop_and_release: |
1333 | dst_release(dst); | |
e6b4d113 WAS |
1334 | drop_and_free: |
1335 | reqsk_free(req); | |
1da177e4 | 1336 | drop: |
1da177e4 LT |
1337 | return 0; /* don't send reset */ |
1338 | } | |
1339 | ||
1340 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1341 | struct request_sock *req, |
1da177e4 LT |
1342 | struct dst_entry *dst) |
1343 | { | |
78d15e82 | 1344 | struct inet6_request_sock *treq; |
1da177e4 LT |
1345 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1346 | struct tcp6_sock *newtcp6sk; | |
1347 | struct inet_sock *newinet; | |
1348 | struct tcp_sock *newtp; | |
1349 | struct sock *newsk; | |
1350 | struct ipv6_txoptions *opt; | |
cfb6eeb4 YH |
1351 | #ifdef CONFIG_TCP_MD5SIG |
1352 | struct tcp_md5sig_key *key; | |
1353 | #endif | |
1da177e4 LT |
1354 | |
1355 | if (skb->protocol == htons(ETH_P_IP)) { | |
1356 | /* | |
1357 | * v6 mapped | |
1358 | */ | |
1359 | ||
1360 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1361 | ||
1ab1457c | 1362 | if (newsk == NULL) |
1da177e4 LT |
1363 | return NULL; |
1364 | ||
1365 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1366 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1367 | ||
1368 | newinet = inet_sk(newsk); | |
1369 | newnp = inet6_sk(newsk); | |
1370 | newtp = tcp_sk(newsk); | |
1371 | ||
1372 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1373 | ||
c720c7e8 | 1374 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1375 | |
c720c7e8 | 1376 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 LT |
1377 | |
1378 | ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); | |
1379 | ||
8292a17a | 1380 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1381 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1382 | #ifdef CONFIG_TCP_MD5SIG |
1383 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1384 | #endif | |
1385 | ||
1da177e4 LT |
1386 | newnp->pktoptions = NULL; |
1387 | newnp->opt = NULL; | |
505cbfc5 | 1388 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1389 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 | 1390 | |
e6848976 ACM |
1391 | /* |
1392 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1393 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1394 | * that function for the gory details. -acme | |
1da177e4 | 1395 | */ |
1da177e4 LT |
1396 | |
1397 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1398 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1399 | Sync it now. |
1400 | */ | |
d83d8461 | 1401 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1402 | |
1403 | return newsk; | |
1404 | } | |
1405 | ||
78d15e82 | 1406 | treq = inet6_rsk(req); |
1da177e4 LT |
1407 | opt = np->opt; |
1408 | ||
1409 | if (sk_acceptq_is_full(sk)) | |
1410 | goto out_overflow; | |
1411 | ||
493f377d DM |
1412 | if (!dst) { |
1413 | dst = inet6_csk_route_req(sk, req); | |
1414 | if (!dst) | |
1da177e4 | 1415 | goto out; |
1ab1457c | 1416 | } |
1da177e4 LT |
1417 | |
1418 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1419 | if (newsk == NULL) | |
093d2823 | 1420 | goto out_nonewsk; |
1da177e4 | 1421 | |
e6848976 ACM |
1422 | /* |
1423 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1424 | * count here, tcp_create_openreq_child now does this for us, see the | |
1425 | * comment in that function for the gory details. -acme | |
1426 | */ | |
1da177e4 | 1427 | |
59eed279 | 1428 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1429 | __ip6_dst_store(newsk, dst, NULL, NULL); |
1da177e4 LT |
1430 | |
1431 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1432 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1433 | ||
1434 | newtp = tcp_sk(newsk); | |
1435 | newinet = inet_sk(newsk); | |
1436 | newnp = inet6_sk(newsk); | |
1437 | ||
1438 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1439 | ||
2e6599cb ACM |
1440 | ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
1441 | ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); | |
1442 | ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); | |
1443 | newsk->sk_bound_dev_if = treq->iif; | |
1da177e4 | 1444 | |
1ab1457c | 1445 | /* Now IPv6 options... |
1da177e4 LT |
1446 | |
1447 | First: no IPv4 options. | |
1448 | */ | |
f6d8bd05 | 1449 | newinet->inet_opt = NULL; |
d35690be | 1450 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1451 | |
1452 | /* Clone RX bits */ | |
1453 | newnp->rxopt.all = np->rxopt.all; | |
1454 | ||
1455 | /* Clone pktoptions received with SYN */ | |
1456 | newnp->pktoptions = NULL; | |
2e6599cb ACM |
1457 | if (treq->pktopts != NULL) { |
1458 | newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); | |
1459 | kfree_skb(treq->pktopts); | |
1460 | treq->pktopts = NULL; | |
1da177e4 LT |
1461 | if (newnp->pktoptions) |
1462 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1463 | } | |
1464 | newnp->opt = NULL; | |
505cbfc5 | 1465 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1466 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
1467 | |
1468 | /* Clone native IPv6 options from listening socket (if any) | |
1469 | ||
1470 | Yes, keeping reference count would be much more clever, | |
1471 | but we make one more one thing there: reattach optmem | |
1472 | to newsk. | |
1473 | */ | |
1474 | if (opt) { | |
1475 | newnp->opt = ipv6_dup_options(newsk, opt); | |
1476 | if (opt != np->opt) | |
1477 | sock_kfree_s(sk, opt, opt->tot_len); | |
1478 | } | |
1479 | ||
d83d8461 | 1480 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1481 | if (newnp->opt) |
d83d8461 ACM |
1482 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1483 | newnp->opt->opt_flen); | |
1da177e4 | 1484 | |
5d424d5a | 1485 | tcp_mtup_init(newsk); |
1da177e4 | 1486 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1487 | newtp->advmss = dst_metric_advmss(dst); |
1da177e4 | 1488 | tcp_initialize_rcv_mss(newsk); |
9ad7c049 JC |
1489 | if (tcp_rsk(req)->snt_synack) |
1490 | tcp_valid_rtt_meas(newsk, | |
1491 | tcp_time_stamp - tcp_rsk(req)->snt_synack); | |
1492 | newtp->total_retrans = req->retrans; | |
1da177e4 | 1493 | |
c720c7e8 ED |
1494 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1495 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1496 | |
cfb6eeb4 YH |
1497 | #ifdef CONFIG_TCP_MD5SIG |
1498 | /* Copy over the MD5 key from the original socket */ | |
1499 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1500 | /* We're using one, so create a matching key | |
1501 | * on the newsk structure. If we fail to get | |
1502 | * memory, then we end up not copying the key | |
1503 | * across. Shucks. | |
1504 | */ | |
af879cc7 ACM |
1505 | char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
1506 | if (newkey != NULL) | |
e547bc1e | 1507 | tcp_v6_md5_do_add(newsk, &newnp->daddr, |
cfb6eeb4 | 1508 | newkey, key->keylen); |
cfb6eeb4 YH |
1509 | } |
1510 | #endif | |
1511 | ||
093d2823 BS |
1512 | if (__inet_inherit_port(sk, newsk) < 0) { |
1513 | sock_put(newsk); | |
1514 | goto out; | |
1515 | } | |
9327f705 | 1516 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1517 | |
1518 | return newsk; | |
1519 | ||
1520 | out_overflow: | |
de0744af | 1521 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1522 | out_nonewsk: |
1da177e4 LT |
1523 | if (opt && opt != np->opt) |
1524 | sock_kfree_s(sk, opt, opt->tot_len); | |
1525 | dst_release(dst); | |
093d2823 BS |
1526 | out: |
1527 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1528 | return NULL; |
1529 | } | |
1530 | ||
b51655b9 | 1531 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1532 | { |
84fa7933 | 1533 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1534 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1535 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1536 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1537 | return 0; |
fb286bb2 | 1538 | } |
1da177e4 | 1539 | } |
fb286bb2 | 1540 | |
684f2176 | 1541 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1542 | &ipv6_hdr(skb)->saddr, |
1543 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1544 | |
1da177e4 | 1545 | if (skb->len <= 76) { |
fb286bb2 | 1546 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1547 | } |
1548 | return 0; | |
1549 | } | |
1550 | ||
1551 | /* The socket must have it's spinlock held when we get | |
1552 | * here. | |
1553 | * | |
1554 | * We have a potential double-lock case here, so even when | |
1555 | * doing backlog processing we use the BH locking scheme. | |
1556 | * This is because we cannot sleep with the original spinlock | |
1557 | * held. | |
1558 | */ | |
1559 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1560 | { | |
1561 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1562 | struct tcp_sock *tp; | |
1563 | struct sk_buff *opt_skb = NULL; | |
1564 | ||
1565 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1566 | goes to IPv4 receive handler and backlogged. | |
1567 | From backlog it always goes here. Kerboom... | |
1568 | Fortunately, tcp_rcv_established and rcv_established | |
1569 | handle them correctly, but it is not case with | |
1570 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1571 | */ | |
1572 | ||
1573 | if (skb->protocol == htons(ETH_P_IP)) | |
1574 | return tcp_v4_do_rcv(sk, skb); | |
1575 | ||
cfb6eeb4 YH |
1576 | #ifdef CONFIG_TCP_MD5SIG |
1577 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1578 | goto discard; | |
1579 | #endif | |
1580 | ||
fda9ef5d | 1581 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1582 | goto discard; |
1583 | ||
1584 | /* | |
1585 | * socket locking is here for SMP purposes as backlog rcv | |
1586 | * is currently called with bh processing disabled. | |
1587 | */ | |
1588 | ||
1589 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1590 | ||
1591 | Yes, guys, it is the only place in our code, where we | |
1592 | may make it not affecting IPv4. | |
1593 | The rest of code is protocol independent, | |
1594 | and I do not like idea to uglify IPv4. | |
1595 | ||
1596 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1597 | looks not very well thought. For now we latch | |
1598 | options, received in the last packet, enqueued | |
1599 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1600 | --ANK (980728) |
1da177e4 LT |
1601 | */ |
1602 | if (np->rxopt.all) | |
1603 | opt_skb = skb_clone(skb, GFP_ATOMIC); | |
1604 | ||
1605 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
47482f13 | 1606 | sock_rps_save_rxhash(sk, skb->rxhash); |
aa8223c7 | 1607 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1608 | goto reset; |
1da177e4 LT |
1609 | if (opt_skb) |
1610 | goto ipv6_pktoptions; | |
1611 | return 0; | |
1612 | } | |
1613 | ||
ab6a5bb6 | 1614 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1615 | goto csum_err; |
1616 | ||
1ab1457c | 1617 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1618 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1619 | if (!nsk) | |
1620 | goto discard; | |
1621 | ||
1622 | /* | |
1623 | * Queue it on the new socket if the new socket is active, | |
1624 | * otherwise we just shortcircuit this and continue with | |
1625 | * the new socket.. | |
1626 | */ | |
1ab1457c | 1627 | if(nsk != sk) { |
1eddcead | 1628 | sock_rps_save_rxhash(nsk, skb->rxhash); |
1da177e4 LT |
1629 | if (tcp_child_process(sk, nsk, skb)) |
1630 | goto reset; | |
1631 | if (opt_skb) | |
1632 | __kfree_skb(opt_skb); | |
1633 | return 0; | |
1634 | } | |
47482f13 NH |
1635 | } else |
1636 | sock_rps_save_rxhash(sk, skb->rxhash); | |
1da177e4 | 1637 | |
aa8223c7 | 1638 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1639 | goto reset; |
1da177e4 LT |
1640 | if (opt_skb) |
1641 | goto ipv6_pktoptions; | |
1642 | return 0; | |
1643 | ||
1644 | reset: | |
cfb6eeb4 | 1645 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1646 | discard: |
1647 | if (opt_skb) | |
1648 | __kfree_skb(opt_skb); | |
1649 | kfree_skb(skb); | |
1650 | return 0; | |
1651 | csum_err: | |
63231bdd | 1652 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1653 | goto discard; |
1654 | ||
1655 | ||
1656 | ipv6_pktoptions: | |
1657 | /* Do you ask, what is it? | |
1658 | ||
1659 | 1. skb was enqueued by tcp. | |
1660 | 2. skb is added to tail of read queue, rather than out of order. | |
1661 | 3. socket is not in passive state. | |
1662 | 4. Finally, it really contains options, which user wants to receive. | |
1663 | */ | |
1664 | tp = tcp_sk(sk); | |
1665 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1666 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1667 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1668 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1669 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1670 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
1da177e4 LT |
1671 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1672 | skb_set_owner_r(opt_skb, sk); | |
1673 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1674 | } else { | |
1675 | __kfree_skb(opt_skb); | |
1676 | opt_skb = xchg(&np->pktoptions, NULL); | |
1677 | } | |
1678 | } | |
1679 | ||
800d55f1 | 1680 | kfree_skb(opt_skb); |
1da177e4 LT |
1681 | return 0; |
1682 | } | |
1683 | ||
e5bbef20 | 1684 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1685 | { |
1ab1457c | 1686 | struct tcphdr *th; |
b71d1d42 | 1687 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1688 | struct sock *sk; |
1689 | int ret; | |
a86b1e30 | 1690 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1691 | |
1692 | if (skb->pkt_type != PACKET_HOST) | |
1693 | goto discard_it; | |
1694 | ||
1695 | /* | |
1696 | * Count it even if it's bad. | |
1697 | */ | |
63231bdd | 1698 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1699 | |
1700 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1701 | goto discard_it; | |
1702 | ||
aa8223c7 | 1703 | th = tcp_hdr(skb); |
1da177e4 LT |
1704 | |
1705 | if (th->doff < sizeof(struct tcphdr)/4) | |
1706 | goto bad_packet; | |
1707 | if (!pskb_may_pull(skb, th->doff*4)) | |
1708 | goto discard_it; | |
1709 | ||
60476372 | 1710 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
1da177e4 LT |
1711 | goto bad_packet; |
1712 | ||
aa8223c7 | 1713 | th = tcp_hdr(skb); |
e802af9c | 1714 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1715 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1716 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1717 | skb->len - th->doff*4); | |
1718 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1719 | TCP_SKB_CB(skb)->when = 0; | |
e802af9c | 1720 | TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1721 | TCP_SKB_CB(skb)->sacked = 0; |
1722 | ||
9a1f27c4 | 1723 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1724 | if (!sk) |
1725 | goto no_tcp_socket; | |
1726 | ||
1727 | process: | |
1728 | if (sk->sk_state == TCP_TIME_WAIT) | |
1729 | goto do_time_wait; | |
1730 | ||
e802af9c SH |
1731 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1732 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1733 | goto discard_and_relse; | |
1734 | } | |
1735 | ||
1da177e4 LT |
1736 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1737 | goto discard_and_relse; | |
1738 | ||
fda9ef5d | 1739 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1740 | goto discard_and_relse; |
1741 | ||
1742 | skb->dev = NULL; | |
1743 | ||
293b9c42 | 1744 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1745 | ret = 0; |
1746 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1747 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1748 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1749 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
f67b4599 | 1750 | tp->ucopy.dma_chan = dma_find_channel(DMA_MEMCPY); |
1ab1457c YH |
1751 | if (tp->ucopy.dma_chan) |
1752 | ret = tcp_v6_do_rcv(sk, skb); | |
1753 | else | |
1a2449a8 CL |
1754 | #endif |
1755 | { | |
1756 | if (!tcp_prequeue(sk, skb)) | |
1757 | ret = tcp_v6_do_rcv(sk, skb); | |
1758 | } | |
6cce09f8 | 1759 | } else if (unlikely(sk_add_backlog(sk, skb))) { |
6b03a53a | 1760 | bh_unlock_sock(sk); |
6cce09f8 | 1761 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1762 | goto discard_and_relse; |
1763 | } | |
1da177e4 LT |
1764 | bh_unlock_sock(sk); |
1765 | ||
1766 | sock_put(sk); | |
1767 | return ret ? -1 : 0; | |
1768 | ||
1769 | no_tcp_socket: | |
1770 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1771 | goto discard_it; | |
1772 | ||
1773 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
1774 | bad_packet: | |
63231bdd | 1775 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1776 | } else { |
cfb6eeb4 | 1777 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1778 | } |
1779 | ||
1780 | discard_it: | |
1781 | ||
1782 | /* | |
1783 | * Discard frame | |
1784 | */ | |
1785 | ||
1786 | kfree_skb(skb); | |
1787 | return 0; | |
1788 | ||
1789 | discard_and_relse: | |
1790 | sock_put(sk); | |
1791 | goto discard_it; | |
1792 | ||
1793 | do_time_wait: | |
1794 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1795 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1796 | goto discard_it; |
1797 | } | |
1798 | ||
1799 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
63231bdd | 1800 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
9469c7b4 | 1801 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1802 | goto discard_it; |
1803 | } | |
1804 | ||
9469c7b4 | 1805 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1806 | case TCP_TW_SYN: |
1807 | { | |
1808 | struct sock *sk2; | |
1809 | ||
c346dca1 | 1810 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
0660e03f | 1811 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1812 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1813 | if (sk2 != NULL) { |
295ff7ed ACM |
1814 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1815 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1816 | inet_twsk_put(tw); | |
1da177e4 LT |
1817 | sk = sk2; |
1818 | goto process; | |
1819 | } | |
1820 | /* Fall through to ACK */ | |
1821 | } | |
1822 | case TCP_TW_ACK: | |
1823 | tcp_v6_timewait_ack(sk, skb); | |
1824 | break; | |
1825 | case TCP_TW_RST: | |
1826 | goto no_tcp_socket; | |
1827 | case TCP_TW_SUCCESS:; | |
1828 | } | |
1829 | goto discard_it; | |
1830 | } | |
1831 | ||
ccb7c410 DM |
1832 | static struct inet_peer *tcp_v6_get_peer(struct sock *sk, bool *release_it) |
1833 | { | |
db3949c4 DM |
1834 | struct rt6_info *rt = (struct rt6_info *) __sk_dst_get(sk); |
1835 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1836 | struct inet_peer *peer; | |
1837 | ||
1838 | if (!rt || | |
1839 | !ipv6_addr_equal(&np->daddr, &rt->rt6i_dst.addr)) { | |
1840 | peer = inet_getpeer_v6(&np->daddr, 1); | |
1841 | *release_it = true; | |
1842 | } else { | |
1843 | if (!rt->rt6i_peer) | |
1844 | rt6_bind_peer(rt, 1); | |
1845 | peer = rt->rt6i_peer; | |
457de438 | 1846 | *release_it = false; |
db3949c4 DM |
1847 | } |
1848 | ||
1849 | return peer; | |
ccb7c410 DM |
1850 | } |
1851 | ||
1852 | static void *tcp_v6_tw_get_peer(struct sock *sk) | |
1da177e4 | 1853 | { |
db3949c4 | 1854 | struct inet6_timewait_sock *tw6 = inet6_twsk(sk); |
ccb7c410 DM |
1855 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1856 | ||
1857 | if (tw->tw_family == AF_INET) | |
1858 | return tcp_v4_tw_get_peer(sk); | |
1859 | ||
db3949c4 | 1860 | return inet_getpeer_v6(&tw6->tw_v6_daddr, 1); |
1da177e4 LT |
1861 | } |
1862 | ||
ccb7c410 DM |
1863 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1864 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1865 | .twsk_unique = tcp_twsk_unique, | |
1866 | .twsk_destructor= tcp_twsk_destructor, | |
1867 | .twsk_getpeer = tcp_v6_tw_get_peer, | |
1868 | }; | |
1869 | ||
3b401a81 | 1870 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1871 | .queue_xmit = inet6_csk_xmit, |
1872 | .send_check = tcp_v6_send_check, | |
1873 | .rebuild_header = inet6_sk_rebuild_header, | |
1874 | .conn_request = tcp_v6_conn_request, | |
1875 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1876 | .get_peer = tcp_v6_get_peer, |
543d9cfe ACM |
1877 | .net_header_len = sizeof(struct ipv6hdr), |
1878 | .setsockopt = ipv6_setsockopt, | |
1879 | .getsockopt = ipv6_getsockopt, | |
1880 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1881 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1882 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1883 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1884 | .compat_setsockopt = compat_ipv6_setsockopt, |
1885 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1886 | #endif |
1da177e4 LT |
1887 | }; |
1888 | ||
cfb6eeb4 | 1889 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1890 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1891 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1892 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 YH |
1893 | .md5_add = tcp_v6_md5_add_func, |
1894 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1895 | }; |
a928630a | 1896 | #endif |
cfb6eeb4 | 1897 | |
1da177e4 LT |
1898 | /* |
1899 | * TCP over IPv4 via INET6 API | |
1900 | */ | |
1901 | ||
3b401a81 | 1902 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1903 | .queue_xmit = ip_queue_xmit, |
1904 | .send_check = tcp_v4_send_check, | |
1905 | .rebuild_header = inet_sk_rebuild_header, | |
1906 | .conn_request = tcp_v6_conn_request, | |
1907 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
3f419d2d | 1908 | .get_peer = tcp_v4_get_peer, |
543d9cfe ACM |
1909 | .net_header_len = sizeof(struct iphdr), |
1910 | .setsockopt = ipv6_setsockopt, | |
1911 | .getsockopt = ipv6_getsockopt, | |
1912 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1913 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1914 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1915 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1916 | .compat_setsockopt = compat_ipv6_setsockopt, |
1917 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1918 | #endif |
1da177e4 LT |
1919 | }; |
1920 | ||
cfb6eeb4 | 1921 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1922 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1923 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1924 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 YH |
1925 | .md5_add = tcp_v6_md5_add_func, |
1926 | .md5_parse = tcp_v6_parse_md5_keys, | |
cfb6eeb4 | 1927 | }; |
a928630a | 1928 | #endif |
cfb6eeb4 | 1929 | |
1da177e4 LT |
1930 | /* NOTE: A lot of things set to zero explicitly by call to |
1931 | * sk_alloc() so need not be done here. | |
1932 | */ | |
1933 | static int tcp_v6_init_sock(struct sock *sk) | |
1934 | { | |
6687e988 | 1935 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
1936 | struct tcp_sock *tp = tcp_sk(sk); |
1937 | ||
1938 | skb_queue_head_init(&tp->out_of_order_queue); | |
1939 | tcp_init_xmit_timers(sk); | |
1940 | tcp_prequeue_init(tp); | |
1941 | ||
6687e988 | 1942 | icsk->icsk_rto = TCP_TIMEOUT_INIT; |
1da177e4 LT |
1943 | tp->mdev = TCP_TIMEOUT_INIT; |
1944 | ||
1945 | /* So many TCP implementations out there (incorrectly) count the | |
1946 | * initial SYN frame in their delayed-ACK and congestion control | |
1947 | * algorithms that we must have the following bandaid to talk | |
1948 | * efficiently to them. -DaveM | |
1949 | */ | |
1950 | tp->snd_cwnd = 2; | |
1951 | ||
1952 | /* See draft-stevens-tcpca-spec-01 for discussion of the | |
1953 | * initialization of these values. | |
1954 | */ | |
0b6a05c1 | 1955 | tp->snd_ssthresh = TCP_INFINITE_SSTHRESH; |
1da177e4 | 1956 | tp->snd_cwnd_clamp = ~0; |
bee7ca9e | 1957 | tp->mss_cache = TCP_MSS_DEFAULT; |
1da177e4 LT |
1958 | |
1959 | tp->reordering = sysctl_tcp_reordering; | |
1960 | ||
1961 | sk->sk_state = TCP_CLOSE; | |
1962 | ||
8292a17a | 1963 | icsk->icsk_af_ops = &ipv6_specific; |
6687e988 | 1964 | icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
d83d8461 | 1965 | icsk->icsk_sync_mss = tcp_sync_mss; |
1da177e4 LT |
1966 | sk->sk_write_space = sk_stream_write_space; |
1967 | sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); | |
1968 | ||
cfb6eeb4 YH |
1969 | #ifdef CONFIG_TCP_MD5SIG |
1970 | tp->af_specific = &tcp_sock_ipv6_specific; | |
1971 | #endif | |
1972 | ||
435cf559 WAS |
1973 | /* TCP Cookie Transactions */ |
1974 | if (sysctl_tcp_cookie_size > 0) { | |
1975 | /* Default, cookies without s_data_payload. */ | |
1976 | tp->cookie_values = | |
1977 | kzalloc(sizeof(*tp->cookie_values), | |
1978 | sk->sk_allocation); | |
1979 | if (tp->cookie_values != NULL) | |
1980 | kref_init(&tp->cookie_values->kref); | |
1981 | } | |
1982 | /* Presumed zeroed, in order of appearance: | |
1983 | * cookie_in_always, cookie_out_never, | |
1984 | * s_data_constant, s_data_in, s_data_out | |
1985 | */ | |
1da177e4 LT |
1986 | sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
1987 | sk->sk_rcvbuf = sysctl_tcp_rmem[1]; | |
1988 | ||
eb4dea58 | 1989 | local_bh_disable(); |
1748376b | 1990 | percpu_counter_inc(&tcp_sockets_allocated); |
eb4dea58 | 1991 | local_bh_enable(); |
1da177e4 LT |
1992 | |
1993 | return 0; | |
1994 | } | |
1995 | ||
7d06b2e0 | 1996 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1997 | { |
cfb6eeb4 YH |
1998 | #ifdef CONFIG_TCP_MD5SIG |
1999 | /* Clean up the MD5 key list */ | |
2000 | if (tcp_sk(sk)->md5sig_info) | |
2001 | tcp_v6_clear_md5_list(sk); | |
2002 | #endif | |
1da177e4 | 2003 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 2004 | inet6_destroy_sock(sk); |
1da177e4 LT |
2005 | } |
2006 | ||
952a10be | 2007 | #ifdef CONFIG_PROC_FS |
1da177e4 | 2008 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 2009 | static void get_openreq6(struct seq_file *seq, |
60236fdd | 2010 | struct sock *sk, struct request_sock *req, int i, int uid) |
1da177e4 | 2011 | { |
1da177e4 | 2012 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
2013 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
2014 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
2015 | |
2016 | if (ttd < 0) | |
2017 | ttd = 0; | |
2018 | ||
1da177e4 LT |
2019 | seq_printf(seq, |
2020 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2021 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2022 | i, |
2023 | src->s6_addr32[0], src->s6_addr32[1], | |
2024 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 2025 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
2026 | dest->s6_addr32[0], dest->s6_addr32[1], |
2027 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 2028 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
2029 | TCP_SYN_RECV, |
2030 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
2031 | 1, /* timers active (only the expire timer) */ |
2032 | jiffies_to_clock_t(ttd), | |
1da177e4 LT |
2033 | req->retrans, |
2034 | uid, | |
1ab1457c | 2035 | 0, /* non standard timer */ |
1da177e4 LT |
2036 | 0, /* open_requests have no inode */ |
2037 | 0, req); | |
2038 | } | |
2039 | ||
2040 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
2041 | { | |
b71d1d42 | 2042 | const struct in6_addr *dest, *src; |
1da177e4 LT |
2043 | __u16 destp, srcp; |
2044 | int timer_active; | |
2045 | unsigned long timer_expires; | |
2046 | struct inet_sock *inet = inet_sk(sp); | |
2047 | struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 2048 | const struct inet_connection_sock *icsk = inet_csk(sp); |
1da177e4 LT |
2049 | struct ipv6_pinfo *np = inet6_sk(sp); |
2050 | ||
2051 | dest = &np->daddr; | |
2052 | src = &np->rcv_saddr; | |
c720c7e8 ED |
2053 | destp = ntohs(inet->inet_dport); |
2054 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
2055 | |
2056 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 2057 | timer_active = 1; |
463c84b9 ACM |
2058 | timer_expires = icsk->icsk_timeout; |
2059 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2060 | timer_active = 4; |
463c84b9 | 2061 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
2062 | } else if (timer_pending(&sp->sk_timer)) { |
2063 | timer_active = 2; | |
2064 | timer_expires = sp->sk_timer.expires; | |
2065 | } else { | |
2066 | timer_active = 0; | |
2067 | timer_expires = jiffies; | |
2068 | } | |
2069 | ||
2070 | seq_printf(seq, | |
2071 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2072 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
2073 | i, |
2074 | src->s6_addr32[0], src->s6_addr32[1], | |
2075 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2076 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2077 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 2078 | sp->sk_state, |
47da8ee6 SS |
2079 | tp->write_seq-tp->snd_una, |
2080 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 LT |
2081 | timer_active, |
2082 | jiffies_to_clock_t(timer_expires - jiffies), | |
463c84b9 | 2083 | icsk->icsk_retransmits, |
1da177e4 | 2084 | sock_i_uid(sp), |
6687e988 | 2085 | icsk->icsk_probes_out, |
1da177e4 LT |
2086 | sock_i_ino(sp), |
2087 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
2088 | jiffies_to_clock_t(icsk->icsk_rto), |
2089 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2090 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
2091 | tp->snd_cwnd, |
2092 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
2093 | ); |
2094 | } | |
2095 | ||
1ab1457c | 2096 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 2097 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 2098 | { |
b71d1d42 | 2099 | const struct in6_addr *dest, *src; |
1da177e4 | 2100 | __u16 destp, srcp; |
0fa1a53e | 2101 | struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
1da177e4 LT |
2102 | int ttd = tw->tw_ttd - jiffies; |
2103 | ||
2104 | if (ttd < 0) | |
2105 | ttd = 0; | |
2106 | ||
0fa1a53e ACM |
2107 | dest = &tw6->tw_v6_daddr; |
2108 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
2109 | destp = ntohs(tw->tw_dport); |
2110 | srcp = ntohs(tw->tw_sport); | |
2111 | ||
2112 | seq_printf(seq, | |
2113 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 2114 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
2115 | i, |
2116 | src->s6_addr32[0], src->s6_addr32[1], | |
2117 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
2118 | dest->s6_addr32[0], dest->s6_addr32[1], | |
2119 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
2120 | tw->tw_substate, 0, 0, | |
2121 | 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, | |
2122 | atomic_read(&tw->tw_refcnt), tw); | |
2123 | } | |
2124 | ||
1da177e4 LT |
2125 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
2126 | { | |
2127 | struct tcp_iter_state *st; | |
2128 | ||
2129 | if (v == SEQ_START_TOKEN) { | |
2130 | seq_puts(seq, | |
2131 | " sl " | |
2132 | "local_address " | |
2133 | "remote_address " | |
2134 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
2135 | " uid timeout inode\n"); | |
2136 | goto out; | |
2137 | } | |
2138 | st = seq->private; | |
2139 | ||
2140 | switch (st->state) { | |
2141 | case TCP_SEQ_STATE_LISTENING: | |
2142 | case TCP_SEQ_STATE_ESTABLISHED: | |
2143 | get_tcp6_sock(seq, v, st->num); | |
2144 | break; | |
2145 | case TCP_SEQ_STATE_OPENREQ: | |
2146 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
2147 | break; | |
2148 | case TCP_SEQ_STATE_TIME_WAIT: | |
2149 | get_timewait6_sock(seq, v, st->num); | |
2150 | break; | |
2151 | } | |
2152 | out: | |
2153 | return 0; | |
2154 | } | |
2155 | ||
1da177e4 | 2156 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
2157 | .name = "tcp6", |
2158 | .family = AF_INET6, | |
5f4472c5 DL |
2159 | .seq_fops = { |
2160 | .owner = THIS_MODULE, | |
2161 | }, | |
9427c4b3 DL |
2162 | .seq_ops = { |
2163 | .show = tcp6_seq_show, | |
2164 | }, | |
1da177e4 LT |
2165 | }; |
2166 | ||
2c8c1e72 | 2167 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 2168 | { |
6f8b13bc | 2169 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2170 | } |
2171 | ||
6f8b13bc | 2172 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 2173 | { |
6f8b13bc | 2174 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
2175 | } |
2176 | #endif | |
2177 | ||
2178 | struct proto tcpv6_prot = { | |
2179 | .name = "TCPv6", | |
2180 | .owner = THIS_MODULE, | |
2181 | .close = tcp_close, | |
2182 | .connect = tcp_v6_connect, | |
2183 | .disconnect = tcp_disconnect, | |
463c84b9 | 2184 | .accept = inet_csk_accept, |
1da177e4 LT |
2185 | .ioctl = tcp_ioctl, |
2186 | .init = tcp_v6_init_sock, | |
2187 | .destroy = tcp_v6_destroy_sock, | |
2188 | .shutdown = tcp_shutdown, | |
2189 | .setsockopt = tcp_setsockopt, | |
2190 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2191 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2192 | .sendmsg = tcp_sendmsg, |
2193 | .sendpage = tcp_sendpage, | |
1da177e4 LT |
2194 | .backlog_rcv = tcp_v6_do_rcv, |
2195 | .hash = tcp_v6_hash, | |
ab1e0a13 ACM |
2196 | .unhash = inet_unhash, |
2197 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
2198 | .enter_memory_pressure = tcp_enter_memory_pressure, |
2199 | .sockets_allocated = &tcp_sockets_allocated, | |
2200 | .memory_allocated = &tcp_memory_allocated, | |
2201 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 2202 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2203 | .sysctl_mem = sysctl_tcp_mem, |
2204 | .sysctl_wmem = sysctl_tcp_wmem, | |
2205 | .sysctl_rmem = sysctl_tcp_rmem, | |
2206 | .max_header = MAX_TCP_HEADER, | |
2207 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 2208 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2209 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 2210 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 2211 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2212 | .no_autobind = true, |
543d9cfe ACM |
2213 | #ifdef CONFIG_COMPAT |
2214 | .compat_setsockopt = compat_tcp_setsockopt, | |
2215 | .compat_getsockopt = compat_tcp_getsockopt, | |
2216 | #endif | |
1da177e4 LT |
2217 | }; |
2218 | ||
41135cc8 | 2219 | static const struct inet6_protocol tcpv6_protocol = { |
1da177e4 LT |
2220 | .handler = tcp_v6_rcv, |
2221 | .err_handler = tcp_v6_err, | |
a430a43d | 2222 | .gso_send_check = tcp_v6_gso_send_check, |
adcfc7d0 | 2223 | .gso_segment = tcp_tso_segment, |
684f2176 HX |
2224 | .gro_receive = tcp6_gro_receive, |
2225 | .gro_complete = tcp6_gro_complete, | |
1da177e4 LT |
2226 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
2227 | }; | |
2228 | ||
1da177e4 LT |
2229 | static struct inet_protosw tcpv6_protosw = { |
2230 | .type = SOCK_STREAM, | |
2231 | .protocol = IPPROTO_TCP, | |
2232 | .prot = &tcpv6_prot, | |
2233 | .ops = &inet6_stream_ops, | |
1da177e4 | 2234 | .no_check = 0, |
d83d8461 ACM |
2235 | .flags = INET_PROTOSW_PERMANENT | |
2236 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
2237 | }; |
2238 | ||
2c8c1e72 | 2239 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 2240 | { |
5677242f DL |
2241 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
2242 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
2243 | } |
2244 | ||
2c8c1e72 | 2245 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 2246 | { |
5677242f | 2247 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
2248 | } |
2249 | ||
2c8c1e72 | 2250 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
2251 | { |
2252 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
2253 | } |
2254 | ||
2255 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
2256 | .init = tcpv6_net_init, |
2257 | .exit = tcpv6_net_exit, | |
2258 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
2259 | }; |
2260 | ||
7f4e4868 | 2261 | int __init tcpv6_init(void) |
1da177e4 | 2262 | { |
7f4e4868 DL |
2263 | int ret; |
2264 | ||
2265 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2266 | if (ret) | |
2267 | goto out; | |
2268 | ||
1da177e4 | 2269 | /* register inet6 protocol */ |
7f4e4868 DL |
2270 | ret = inet6_register_protosw(&tcpv6_protosw); |
2271 | if (ret) | |
2272 | goto out_tcpv6_protocol; | |
2273 | ||
93ec926b | 2274 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2275 | if (ret) |
2276 | goto out_tcpv6_protosw; | |
2277 | out: | |
2278 | return ret; | |
ae0f7d5f | 2279 | |
7f4e4868 DL |
2280 | out_tcpv6_protocol: |
2281 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
2282 | out_tcpv6_protosw: | |
2283 | inet6_unregister_protosw(&tcpv6_protosw); | |
2284 | goto out; | |
2285 | } | |
2286 | ||
09f7709f | 2287 | void tcpv6_exit(void) |
7f4e4868 | 2288 | { |
93ec926b | 2289 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2290 | inet6_unregister_protosw(&tcpv6_protosw); |
2291 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2292 | } |