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> |
1da177e4 LT |
42 | |
43 | #include <linux/ipv6.h> | |
44 | #include <linux/icmpv6.h> | |
45 | #include <linux/random.h> | |
46 | ||
47 | #include <net/tcp.h> | |
48 | #include <net/ndisc.h> | |
5324a040 | 49 | #include <net/inet6_hashtables.h> |
8129765a | 50 | #include <net/inet6_connection_sock.h> |
1da177e4 LT |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/ip6_route.h> | |
55 | #include <net/ip6_checksum.h> | |
56 | #include <net/inet_ecn.h> | |
57 | #include <net/protocol.h> | |
58 | #include <net/xfrm.h> | |
1da177e4 LT |
59 | #include <net/snmp.h> |
60 | #include <net/dsfield.h> | |
6d6ee43e | 61 | #include <net/timewait_sock.h> |
18134bed | 62 | #include <net/netdma.h> |
3d58b5fa | 63 | #include <net/inet_common.h> |
6e5714ea | 64 | #include <net/secure_seq.h> |
d1a4c0b3 | 65 | #include <net/tcp_memcontrol.h> |
1da177e4 LT |
66 | |
67 | #include <asm/uaccess.h> | |
68 | ||
69 | #include <linux/proc_fs.h> | |
70 | #include <linux/seq_file.h> | |
71 | ||
cfb6eeb4 YH |
72 | #include <linux/crypto.h> |
73 | #include <linux/scatterlist.h> | |
74 | ||
cfb6eeb4 | 75 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
6edafaaf GJ |
76 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
77 | struct request_sock *req); | |
1da177e4 LT |
78 | |
79 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); | |
1da177e4 | 80 | |
3b401a81 SH |
81 | static const struct inet_connection_sock_af_ops ipv6_mapped; |
82 | static const struct inet_connection_sock_af_ops ipv6_specific; | |
a928630a | 83 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de SH |
84 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
85 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; | |
9501f972 YH |
86 | #else |
87 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 88 | const struct in6_addr *addr) |
9501f972 YH |
89 | { |
90 | return NULL; | |
91 | } | |
a928630a | 92 | #endif |
1da177e4 | 93 | |
fae6ef87 NC |
94 | static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
95 | { | |
96 | struct dst_entry *dst = skb_dst(skb); | |
97 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
98 | ||
99 | dst_hold(dst); | |
100 | sk->sk_rx_dst = dst; | |
101 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
102 | if (rt->rt6i_node) | |
103 | inet6_sk(sk)->rx_dst_cookie = rt->rt6i_node->fn_sernum; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | static void tcp_v6_hash(struct sock *sk) |
107 | { | |
108 | if (sk->sk_state != TCP_CLOSE) { | |
8292a17a | 109 | if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
1da177e4 LT |
110 | tcp_prot.hash(sk); |
111 | return; | |
112 | } | |
113 | local_bh_disable(); | |
9327f705 | 114 | __inet6_hash(sk, NULL); |
1da177e4 LT |
115 | local_bh_enable(); |
116 | } | |
117 | } | |
118 | ||
cf533ea5 | 119 | static __u32 tcp_v6_init_sequence(const struct sk_buff *skb) |
1da177e4 | 120 | { |
0660e03f ACM |
121 | return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
122 | ipv6_hdr(skb)->saddr.s6_addr32, | |
aa8223c7 ACM |
123 | tcp_hdr(skb)->dest, |
124 | tcp_hdr(skb)->source); | |
1da177e4 LT |
125 | } |
126 | ||
1ab1457c | 127 | static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
1da177e4 LT |
128 | int addr_len) |
129 | { | |
130 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
1ab1457c | 131 | struct inet_sock *inet = inet_sk(sk); |
d83d8461 | 132 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 LT |
133 | struct ipv6_pinfo *np = inet6_sk(sk); |
134 | struct tcp_sock *tp = tcp_sk(sk); | |
20c59de2 | 135 | struct in6_addr *saddr = NULL, *final_p, final; |
493f377d | 136 | struct rt6_info *rt; |
4c9483b2 | 137 | struct flowi6 fl6; |
1da177e4 LT |
138 | struct dst_entry *dst; |
139 | int addr_type; | |
140 | int err; | |
141 | ||
1ab1457c | 142 | if (addr_len < SIN6_LEN_RFC2133) |
1da177e4 LT |
143 | return -EINVAL; |
144 | ||
1ab1457c | 145 | if (usin->sin6_family != AF_INET6) |
a02cec21 | 146 | return -EAFNOSUPPORT; |
1da177e4 | 147 | |
4c9483b2 | 148 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
149 | |
150 | if (np->sndflow) { | |
4c9483b2 DM |
151 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
152 | IP6_ECN_flow_init(fl6.flowlabel); | |
153 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1da177e4 | 154 | struct ip6_flowlabel *flowlabel; |
4c9483b2 | 155 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); |
1da177e4 LT |
156 | if (flowlabel == NULL) |
157 | return -EINVAL; | |
4e3fd7a0 | 158 | usin->sin6_addr = flowlabel->dst; |
1da177e4 LT |
159 | fl6_sock_release(flowlabel); |
160 | } | |
161 | } | |
162 | ||
163 | /* | |
1ab1457c YH |
164 | * connect() to INADDR_ANY means loopback (BSD'ism). |
165 | */ | |
166 | ||
167 | if(ipv6_addr_any(&usin->sin6_addr)) | |
168 | usin->sin6_addr.s6_addr[15] = 0x1; | |
1da177e4 LT |
169 | |
170 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
171 | ||
172 | if(addr_type & IPV6_ADDR_MULTICAST) | |
173 | return -ENETUNREACH; | |
174 | ||
175 | if (addr_type&IPV6_ADDR_LINKLOCAL) { | |
176 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
177 | usin->sin6_scope_id) { | |
178 | /* If interface is set while binding, indices | |
179 | * must coincide. | |
180 | */ | |
181 | if (sk->sk_bound_dev_if && | |
182 | sk->sk_bound_dev_if != usin->sin6_scope_id) | |
183 | return -EINVAL; | |
184 | ||
185 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
186 | } | |
187 | ||
188 | /* Connect to link-local address requires an interface */ | |
189 | if (!sk->sk_bound_dev_if) | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | if (tp->rx_opt.ts_recent_stamp && | |
194 | !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { | |
195 | tp->rx_opt.ts_recent = 0; | |
196 | tp->rx_opt.ts_recent_stamp = 0; | |
197 | tp->write_seq = 0; | |
198 | } | |
199 | ||
4e3fd7a0 | 200 | np->daddr = usin->sin6_addr; |
4c9483b2 | 201 | np->flow_label = fl6.flowlabel; |
1da177e4 LT |
202 | |
203 | /* | |
204 | * TCP over IPv4 | |
205 | */ | |
206 | ||
207 | if (addr_type == IPV6_ADDR_MAPPED) { | |
d83d8461 | 208 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
1da177e4 LT |
209 | struct sockaddr_in sin; |
210 | ||
211 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); | |
212 | ||
213 | if (__ipv6_only_sock(sk)) | |
214 | return -ENETUNREACH; | |
215 | ||
216 | sin.sin_family = AF_INET; | |
217 | sin.sin_port = usin->sin6_port; | |
218 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; | |
219 | ||
d83d8461 | 220 | icsk->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 221 | sk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
222 | #ifdef CONFIG_TCP_MD5SIG |
223 | tp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
224 | #endif | |
1da177e4 LT |
225 | |
226 | err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); | |
227 | ||
228 | if (err) { | |
d83d8461 ACM |
229 | icsk->icsk_ext_hdr_len = exthdrlen; |
230 | icsk->icsk_af_ops = &ipv6_specific; | |
1da177e4 | 231 | sk->sk_backlog_rcv = tcp_v6_do_rcv; |
cfb6eeb4 YH |
232 | #ifdef CONFIG_TCP_MD5SIG |
233 | tp->af_specific = &tcp_sock_ipv6_specific; | |
234 | #endif | |
1da177e4 LT |
235 | goto failure; |
236 | } else { | |
c720c7e8 ED |
237 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
238 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, | |
239 | &np->rcv_saddr); | |
1da177e4 LT |
240 | } |
241 | ||
242 | return err; | |
243 | } | |
244 | ||
245 | if (!ipv6_addr_any(&np->rcv_saddr)) | |
246 | saddr = &np->rcv_saddr; | |
247 | ||
4c9483b2 | 248 | fl6.flowi6_proto = IPPROTO_TCP; |
4e3fd7a0 AD |
249 | fl6.daddr = np->daddr; |
250 | fl6.saddr = saddr ? *saddr : np->saddr; | |
4c9483b2 DM |
251 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
252 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
253 | fl6.fl6_dport = usin->sin6_port; |
254 | fl6.fl6_sport = inet->inet_sport; | |
6fa3eb70 | 255 | fl6.flowi6_uid = sock_i_uid(sk); |
1da177e4 | 256 | |
4c9483b2 | 257 | final_p = fl6_update_dst(&fl6, np->opt, &final); |
1da177e4 | 258 | |
4c9483b2 | 259 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 260 | |
4c9483b2 | 261 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
262 | if (IS_ERR(dst)) { |
263 | err = PTR_ERR(dst); | |
1da177e4 | 264 | goto failure; |
14e50e57 | 265 | } |
1da177e4 LT |
266 | |
267 | if (saddr == NULL) { | |
4c9483b2 | 268 | saddr = &fl6.saddr; |
4e3fd7a0 | 269 | np->rcv_saddr = *saddr; |
1da177e4 LT |
270 | } |
271 | ||
272 | /* set the source address */ | |
4e3fd7a0 | 273 | np->saddr = *saddr; |
c720c7e8 | 274 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
1da177e4 | 275 | |
f83ef8c0 | 276 | sk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 277 | __ip6_dst_store(sk, dst, NULL, NULL); |
1da177e4 | 278 | |
493f377d DM |
279 | rt = (struct rt6_info *) dst; |
280 | if (tcp_death_row.sysctl_tw_recycle && | |
281 | !tp->rx_opt.ts_recent_stamp && | |
81166dd6 DM |
282 | ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) |
283 | tcp_fetch_timewait_stamp(sk, dst); | |
493f377d | 284 | |
d83d8461 | 285 | icsk->icsk_ext_hdr_len = 0; |
1da177e4 | 286 | if (np->opt) |
d83d8461 ACM |
287 | icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
288 | np->opt->opt_nflen); | |
1da177e4 LT |
289 | |
290 | tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
291 | ||
c720c7e8 | 292 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
293 | |
294 | tcp_set_state(sk, TCP_SYN_SENT); | |
d8313f5c | 295 | err = inet6_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
296 | if (err) |
297 | goto late_failure; | |
298 | ||
6fa3eb70 | 299 | printk(KERN_INFO "net_sock, IPV6 socket[%lu] sport:%u \n", SOCK_INODE(sk->sk_socket)->i_ino, ntohs(inet->inet_sport)); |
2b916477 | 300 | if (!tp->write_seq && likely(!tp->repair)) |
1da177e4 LT |
301 | tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
302 | np->daddr.s6_addr32, | |
c720c7e8 ED |
303 | inet->inet_sport, |
304 | inet->inet_dport); | |
1da177e4 LT |
305 | |
306 | err = tcp_connect(sk); | |
307 | if (err) | |
308 | goto late_failure; | |
309 | ||
310 | return 0; | |
311 | ||
312 | late_failure: | |
313 | tcp_set_state(sk, TCP_CLOSE); | |
314 | __sk_dst_reset(sk); | |
315 | failure: | |
c720c7e8 | 316 | inet->inet_dport = 0; |
1da177e4 LT |
317 | sk->sk_route_caps = 0; |
318 | return err; | |
319 | } | |
320 | ||
563d34d0 ED |
321 | static void tcp_v6_mtu_reduced(struct sock *sk) |
322 | { | |
323 | struct dst_entry *dst; | |
324 | ||
325 | if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) | |
326 | return; | |
327 | ||
328 | dst = inet6_csk_update_pmtu(sk, tcp_sk(sk)->mtu_info); | |
329 | if (!dst) | |
330 | return; | |
331 | ||
332 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { | |
333 | tcp_sync_mss(sk, dst_mtu(dst)); | |
334 | tcp_simple_retransmit(sk); | |
335 | } | |
336 | } | |
337 | ||
1da177e4 | 338 | static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 339 | u8 type, u8 code, int offset, __be32 info) |
1da177e4 | 340 | { |
b71d1d42 | 341 | const struct ipv6hdr *hdr = (const struct ipv6hdr*)skb->data; |
505cbfc5 | 342 | const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
1da177e4 LT |
343 | struct ipv6_pinfo *np; |
344 | struct sock *sk; | |
345 | int err; | |
1ab1457c | 346 | struct tcp_sock *tp; |
1da177e4 | 347 | __u32 seq; |
ca12a1a4 | 348 | struct net *net = dev_net(skb->dev); |
1da177e4 | 349 | |
ca12a1a4 | 350 | sk = inet6_lookup(net, &tcp_hashinfo, &hdr->daddr, |
d86e0dac | 351 | th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
1da177e4 LT |
352 | |
353 | if (sk == NULL) { | |
e41b5368 DL |
354 | ICMP6_INC_STATS_BH(net, __in6_dev_get(skb->dev), |
355 | ICMP6_MIB_INERRORS); | |
1da177e4 LT |
356 | return; |
357 | } | |
358 | ||
359 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 360 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
361 | return; |
362 | } | |
363 | ||
364 | bh_lock_sock(sk); | |
563d34d0 | 365 | if (sock_owned_by_user(sk) && type != ICMPV6_PKT_TOOBIG) |
de0744af | 366 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); |
1da177e4 LT |
367 | |
368 | if (sk->sk_state == TCP_CLOSE) | |
369 | goto out; | |
370 | ||
e802af9c SH |
371 | if (ipv6_hdr(skb)->hop_limit < inet6_sk(sk)->min_hopcount) { |
372 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
373 | goto out; | |
374 | } | |
375 | ||
1da177e4 | 376 | tp = tcp_sk(sk); |
1ab1457c | 377 | seq = ntohl(th->seq); |
1da177e4 LT |
378 | if (sk->sk_state != TCP_LISTEN && |
379 | !between(seq, tp->snd_una, tp->snd_nxt)) { | |
de0744af | 380 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
381 | goto out; |
382 | } | |
383 | ||
384 | np = inet6_sk(sk); | |
385 | ||
ec18d9a2 DM |
386 | if (type == NDISC_REDIRECT) { |
387 | struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie); | |
388 | ||
1ed5c48f | 389 | if (dst) |
6700c270 | 390 | dst->ops->redirect(dst, sk, skb); |
50a75a89 | 391 | goto out; |
ec18d9a2 DM |
392 | } |
393 | ||
1da177e4 | 394 | if (type == ICMPV6_PKT_TOOBIG) { |
0d4f0608 ED |
395 | /* We are not interested in TCP_LISTEN and open_requests |
396 | * (SYN-ACKs send out by Linux are always <576bytes so | |
397 | * they should go through unfragmented). | |
398 | */ | |
399 | if (sk->sk_state == TCP_LISTEN) | |
400 | goto out; | |
401 | ||
563d34d0 ED |
402 | tp->mtu_info = ntohl(info); |
403 | if (!sock_owned_by_user(sk)) | |
404 | tcp_v6_mtu_reduced(sk); | |
d013ef2a JA |
405 | else if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, |
406 | &tp->tsq_flags)) | |
407 | sock_hold(sk); | |
1da177e4 LT |
408 | goto out; |
409 | } | |
410 | ||
411 | icmpv6_err_convert(type, code, &err); | |
412 | ||
60236fdd | 413 | /* Might be for an request_sock */ |
1da177e4 | 414 | switch (sk->sk_state) { |
60236fdd | 415 | struct request_sock *req, **prev; |
1da177e4 LT |
416 | case TCP_LISTEN: |
417 | if (sock_owned_by_user(sk)) | |
418 | goto out; | |
419 | ||
8129765a ACM |
420 | req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
421 | &hdr->saddr, inet6_iif(skb)); | |
1da177e4 LT |
422 | if (!req) |
423 | goto out; | |
424 | ||
425 | /* ICMPs are not backlogged, hence we cannot get | |
426 | * an established socket here. | |
427 | */ | |
547b792c | 428 | WARN_ON(req->sk != NULL); |
1da177e4 | 429 | |
2e6599cb | 430 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 431 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
432 | goto out; |
433 | } | |
434 | ||
463c84b9 | 435 | inet_csk_reqsk_queue_drop(sk, req, prev); |
5f1e942c | 436 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
437 | goto out; |
438 | ||
439 | case TCP_SYN_SENT: | |
440 | case TCP_SYN_RECV: /* Cannot happen. | |
1ab1457c | 441 | It can, it SYNs are crossed. --ANK */ |
1da177e4 | 442 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
443 | sk->sk_err = err; |
444 | sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ | |
445 | ||
446 | tcp_done(sk); | |
447 | } else | |
448 | sk->sk_err_soft = err; | |
449 | goto out; | |
450 | } | |
451 | ||
452 | if (!sock_owned_by_user(sk) && np->recverr) { | |
453 | sk->sk_err = err; | |
454 | sk->sk_error_report(sk); | |
455 | } else | |
456 | sk->sk_err_soft = err; | |
457 | ||
458 | out: | |
459 | bh_unlock_sock(sk); | |
460 | sock_put(sk); | |
461 | } | |
462 | ||
463 | ||
9f10d3f6 NC |
464 | static int tcp_v6_send_synack(struct sock *sk, struct dst_entry *dst, |
465 | struct flowi6 *fl6, | |
3840a06e | 466 | struct request_sock *req, |
fff32699 | 467 | u16 queue_mapping) |
1da177e4 | 468 | { |
ca304b61 | 469 | struct inet6_request_sock *treq = inet6_rsk(req); |
1da177e4 LT |
470 | struct ipv6_pinfo *np = inet6_sk(sk); |
471 | struct sk_buff * skb; | |
9494218f | 472 | int err = -ENOMEM; |
1da177e4 | 473 | |
9f10d3f6 NC |
474 | /* First, grab a route. */ |
475 | if (!dst && (dst = inet6_csk_route_req(sk, fl6, req)) == NULL) | |
fd80eb94 | 476 | goto done; |
9494218f | 477 | |
1a2c6181 | 478 | skb = tcp_make_synack(sk, dst, req, NULL); |
9494218f | 479 | |
1da177e4 | 480 | if (skb) { |
8ad50d96 | 481 | __tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr); |
1da177e4 | 482 | |
9f10d3f6 | 483 | fl6->daddr = treq->rmt_addr; |
fff32699 | 484 | skb_set_queue_mapping(skb, queue_mapping); |
43264e0b | 485 | err = ip6_xmit(sk, skb, fl6, np->opt, np->tclass); |
b9df3cb8 | 486 | err = net_xmit_eval(err); |
1da177e4 LT |
487 | } |
488 | ||
489 | done: | |
1da177e4 LT |
490 | return err; |
491 | } | |
492 | ||
1a2c6181 | 493 | static int tcp_v6_rtx_synack(struct sock *sk, struct request_sock *req) |
72659ecc | 494 | { |
9f10d3f6 | 495 | struct flowi6 fl6; |
e6c022a4 | 496 | int res; |
9f10d3f6 | 497 | |
1a2c6181 | 498 | res = tcp_v6_send_synack(sk, NULL, &fl6, req, 0); |
e6c022a4 ED |
499 | if (!res) |
500 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_RETRANSSEGS); | |
501 | return res; | |
72659ecc OP |
502 | } |
503 | ||
60236fdd | 504 | static void tcp_v6_reqsk_destructor(struct request_sock *req) |
1da177e4 | 505 | { |
800d55f1 | 506 | kfree_skb(inet6_rsk(req)->pktopts); |
1da177e4 LT |
507 | } |
508 | ||
cfb6eeb4 YH |
509 | #ifdef CONFIG_TCP_MD5SIG |
510 | static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, | |
b71d1d42 | 511 | const struct in6_addr *addr) |
cfb6eeb4 | 512 | { |
a915da9b | 513 | return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6); |
cfb6eeb4 YH |
514 | } |
515 | ||
516 | static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, | |
517 | struct sock *addr_sk) | |
518 | { | |
519 | return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); | |
520 | } | |
521 | ||
522 | static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, | |
523 | struct request_sock *req) | |
524 | { | |
525 | return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); | |
526 | } | |
527 | ||
cfb6eeb4 YH |
528 | static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
529 | int optlen) | |
530 | { | |
531 | struct tcp_md5sig cmd; | |
532 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
533 | |
534 | if (optlen < sizeof(cmd)) | |
535 | return -EINVAL; | |
536 | ||
537 | if (copy_from_user(&cmd, optval, sizeof(cmd))) | |
538 | return -EFAULT; | |
539 | ||
540 | if (sin6->sin6_family != AF_INET6) | |
541 | return -EINVAL; | |
542 | ||
543 | if (!cmd.tcpm_keylen) { | |
e773e4fa | 544 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
a915da9b ED |
545 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], |
546 | AF_INET); | |
547 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr, | |
548 | AF_INET6); | |
cfb6eeb4 YH |
549 | } |
550 | ||
551 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
552 | return -EINVAL; | |
553 | ||
a915da9b ED |
554 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
555 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3], | |
556 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 | 557 | |
a915da9b ED |
558 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr, |
559 | AF_INET6, cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); | |
cfb6eeb4 YH |
560 | } |
561 | ||
49a72dfb | 562 | static int tcp_v6_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
b71d1d42 ED |
563 | const struct in6_addr *daddr, |
564 | const struct in6_addr *saddr, int nbytes) | |
cfb6eeb4 | 565 | { |
cfb6eeb4 | 566 | struct tcp6_pseudohdr *bp; |
49a72dfb | 567 | struct scatterlist sg; |
8d26d76d | 568 | |
cfb6eeb4 | 569 | bp = &hp->md5_blk.ip6; |
cfb6eeb4 | 570 | /* 1. TCP pseudo-header (RFC2460) */ |
4e3fd7a0 AD |
571 | bp->saddr = *saddr; |
572 | bp->daddr = *daddr; | |
49a72dfb | 573 | bp->protocol = cpu_to_be32(IPPROTO_TCP); |
00b1304c | 574 | bp->len = cpu_to_be32(nbytes); |
cfb6eeb4 | 575 | |
49a72dfb AL |
576 | sg_init_one(&sg, bp, sizeof(*bp)); |
577 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
578 | } | |
c7da57a1 | 579 | |
49a72dfb | 580 | static int tcp_v6_md5_hash_hdr(char *md5_hash, struct tcp_md5sig_key *key, |
b71d1d42 | 581 | const struct in6_addr *daddr, struct in6_addr *saddr, |
318cf7aa | 582 | const struct tcphdr *th) |
49a72dfb AL |
583 | { |
584 | struct tcp_md5sig_pool *hp; | |
585 | struct hash_desc *desc; | |
586 | ||
587 | hp = tcp_get_md5sig_pool(); | |
588 | if (!hp) | |
589 | goto clear_hash_noput; | |
590 | desc = &hp->md5_desc; | |
591 | ||
592 | if (crypto_hash_init(desc)) | |
593 | goto clear_hash; | |
594 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
595 | goto clear_hash; | |
596 | if (tcp_md5_hash_header(hp, th)) | |
597 | goto clear_hash; | |
598 | if (tcp_md5_hash_key(hp, key)) | |
599 | goto clear_hash; | |
600 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 | 601 | goto clear_hash; |
cfb6eeb4 | 602 | |
cfb6eeb4 | 603 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 604 | return 0; |
49a72dfb | 605 | |
cfb6eeb4 YH |
606 | clear_hash: |
607 | tcp_put_md5sig_pool(); | |
608 | clear_hash_noput: | |
609 | memset(md5_hash, 0, 16); | |
49a72dfb | 610 | return 1; |
cfb6eeb4 YH |
611 | } |
612 | ||
49a72dfb | 613 | static int tcp_v6_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
614 | const struct sock *sk, |
615 | const struct request_sock *req, | |
616 | const struct sk_buff *skb) | |
cfb6eeb4 | 617 | { |
b71d1d42 | 618 | const struct in6_addr *saddr, *daddr; |
49a72dfb AL |
619 | struct tcp_md5sig_pool *hp; |
620 | struct hash_desc *desc; | |
318cf7aa | 621 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
622 | |
623 | if (sk) { | |
624 | saddr = &inet6_sk(sk)->saddr; | |
625 | daddr = &inet6_sk(sk)->daddr; | |
49a72dfb | 626 | } else if (req) { |
cfb6eeb4 YH |
627 | saddr = &inet6_rsk(req)->loc_addr; |
628 | daddr = &inet6_rsk(req)->rmt_addr; | |
49a72dfb | 629 | } else { |
b71d1d42 | 630 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
49a72dfb AL |
631 | saddr = &ip6h->saddr; |
632 | daddr = &ip6h->daddr; | |
cfb6eeb4 | 633 | } |
49a72dfb AL |
634 | |
635 | hp = tcp_get_md5sig_pool(); | |
636 | if (!hp) | |
637 | goto clear_hash_noput; | |
638 | desc = &hp->md5_desc; | |
639 | ||
640 | if (crypto_hash_init(desc)) | |
641 | goto clear_hash; | |
642 | ||
643 | if (tcp_v6_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
644 | goto clear_hash; | |
645 | if (tcp_md5_hash_header(hp, th)) | |
646 | goto clear_hash; | |
647 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
648 | goto clear_hash; | |
649 | if (tcp_md5_hash_key(hp, key)) | |
650 | goto clear_hash; | |
651 | if (crypto_hash_final(desc, md5_hash)) | |
652 | goto clear_hash; | |
653 | ||
654 | tcp_put_md5sig_pool(); | |
655 | return 0; | |
656 | ||
657 | clear_hash: | |
658 | tcp_put_md5sig_pool(); | |
659 | clear_hash_noput: | |
660 | memset(md5_hash, 0, 16); | |
661 | return 1; | |
cfb6eeb4 YH |
662 | } |
663 | ||
318cf7aa | 664 | static int tcp_v6_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
cfb6eeb4 | 665 | { |
cf533ea5 | 666 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 667 | struct tcp_md5sig_key *hash_expected; |
b71d1d42 | 668 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
318cf7aa | 669 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 670 | int genhash; |
cfb6eeb4 YH |
671 | u8 newhash[16]; |
672 | ||
673 | hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); | |
7d5d5525 | 674 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 675 | |
785957d3 DM |
676 | /* We've parsed the options - do we have a hash? */ |
677 | if (!hash_expected && !hash_location) | |
678 | return 0; | |
679 | ||
680 | if (hash_expected && !hash_location) { | |
681 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); | |
cfb6eeb4 YH |
682 | return 1; |
683 | } | |
684 | ||
785957d3 DM |
685 | if (!hash_expected && hash_location) { |
686 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); | |
cfb6eeb4 YH |
687 | return 1; |
688 | } | |
689 | ||
690 | /* check the signature */ | |
49a72dfb AL |
691 | genhash = tcp_v6_md5_hash_skb(newhash, |
692 | hash_expected, | |
693 | NULL, NULL, skb); | |
694 | ||
cfb6eeb4 | 695 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
e87cc472 JP |
696 | net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n", |
697 | genhash ? "failed" : "mismatch", | |
698 | &ip6h->saddr, ntohs(th->source), | |
699 | &ip6h->daddr, ntohs(th->dest)); | |
cfb6eeb4 YH |
700 | return 1; |
701 | } | |
702 | return 0; | |
703 | } | |
704 | #endif | |
705 | ||
c6aefafb | 706 | struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
1da177e4 | 707 | .family = AF_INET6, |
2e6599cb | 708 | .obj_size = sizeof(struct tcp6_request_sock), |
72659ecc | 709 | .rtx_syn_ack = tcp_v6_rtx_synack, |
60236fdd ACM |
710 | .send_ack = tcp_v6_reqsk_send_ack, |
711 | .destructor = tcp_v6_reqsk_destructor, | |
72659ecc OP |
712 | .send_reset = tcp_v6_send_reset, |
713 | .syn_ack_timeout = tcp_syn_ack_timeout, | |
1da177e4 LT |
714 | }; |
715 | ||
cfb6eeb4 | 716 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 717 | static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
cfb6eeb4 | 718 | .md5_lookup = tcp_v6_reqsk_md5_lookup, |
e3afe7b7 | 719 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 720 | }; |
b6332e6c | 721 | #endif |
cfb6eeb4 | 722 | |
626e264d | 723 | static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win, |
ee684b6f AV |
724 | u32 tsval, u32 tsecr, |
725 | struct tcp_md5sig_key *key, int rst, u8 tclass) | |
1da177e4 | 726 | { |
cf533ea5 ED |
727 | const struct tcphdr *th = tcp_hdr(skb); |
728 | struct tcphdr *t1; | |
1da177e4 | 729 | struct sk_buff *buff; |
4c9483b2 | 730 | struct flowi6 fl6; |
adf30907 | 731 | struct net *net = dev_net(skb_dst(skb)->dev); |
e5047992 | 732 | struct sock *ctl_sk = net->ipv6.tcp_sk; |
77c676da | 733 | unsigned int tot_len = sizeof(struct tcphdr); |
adf30907 | 734 | struct dst_entry *dst; |
81ada62d | 735 | __be32 *topt; |
1da177e4 | 736 | |
ee684b6f | 737 | if (tsecr) |
626e264d | 738 | tot_len += TCPOLEN_TSTAMP_ALIGNED; |
cfb6eeb4 | 739 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 YH |
740 | if (key) |
741 | tot_len += TCPOLEN_MD5SIG_ALIGNED; | |
742 | #endif | |
743 | ||
cfb6eeb4 | 744 | buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
1da177e4 | 745 | GFP_ATOMIC); |
1ab1457c YH |
746 | if (buff == NULL) |
747 | return; | |
1da177e4 | 748 | |
cfb6eeb4 | 749 | skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
1da177e4 | 750 | |
cfb6eeb4 | 751 | t1 = (struct tcphdr *) skb_push(buff, tot_len); |
6651ffc8 | 752 | skb_reset_transport_header(buff); |
1da177e4 LT |
753 | |
754 | /* Swap the send and the receive. */ | |
755 | memset(t1, 0, sizeof(*t1)); | |
756 | t1->dest = th->source; | |
757 | t1->source = th->dest; | |
cfb6eeb4 | 758 | t1->doff = tot_len / 4; |
626e264d IJ |
759 | t1->seq = htonl(seq); |
760 | t1->ack_seq = htonl(ack); | |
761 | t1->ack = !rst || !th->ack; | |
762 | t1->rst = rst; | |
763 | t1->window = htons(win); | |
1da177e4 | 764 | |
81ada62d IJ |
765 | topt = (__be32 *)(t1 + 1); |
766 | ||
ee684b6f | 767 | if (tsecr) { |
626e264d IJ |
768 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
769 | (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
770 | *topt++ = htonl(tsval); |
771 | *topt++ = htonl(tsecr); | |
626e264d IJ |
772 | } |
773 | ||
cfb6eeb4 YH |
774 | #ifdef CONFIG_TCP_MD5SIG |
775 | if (key) { | |
81ada62d IJ |
776 | *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
777 | (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); | |
778 | tcp_v6_md5_hash_hdr((__u8 *)topt, key, | |
78e645cb IJ |
779 | &ipv6_hdr(skb)->saddr, |
780 | &ipv6_hdr(skb)->daddr, t1); | |
cfb6eeb4 YH |
781 | } |
782 | #endif | |
783 | ||
4c9483b2 | 784 | memset(&fl6, 0, sizeof(fl6)); |
4e3fd7a0 AD |
785 | fl6.daddr = ipv6_hdr(skb)->saddr; |
786 | fl6.saddr = ipv6_hdr(skb)->daddr; | |
1da177e4 | 787 | |
e5700aff DM |
788 | buff->ip_summed = CHECKSUM_PARTIAL; |
789 | buff->csum = 0; | |
790 | ||
4c9483b2 | 791 | __tcp_v6_send_check(buff, &fl6.saddr, &fl6.daddr); |
1da177e4 | 792 | |
4c9483b2 | 793 | fl6.flowi6_proto = IPPROTO_TCP; |
4c675258 AK |
794 | if (ipv6_addr_type(&fl6.daddr) & IPV6_ADDR_LINKLOCAL) |
795 | fl6.flowi6_oif = inet6_iif(skb); | |
6fa3eb70 | 796 | fl6.flowi6_mark = IP6_REPLY_MARK(net, skb->mark); |
1958b856 DM |
797 | fl6.fl6_dport = t1->dest; |
798 | fl6.fl6_sport = t1->source; | |
4c9483b2 | 799 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
1da177e4 | 800 | |
c20121ae DL |
801 | /* Pass a socket to ip6_dst_lookup either it is for RST |
802 | * Underlying function will use this to retrieve the network | |
803 | * namespace | |
804 | */ | |
4c9483b2 | 805 | dst = ip6_dst_lookup_flow(ctl_sk, &fl6, NULL, false); |
68d0c6d3 DM |
806 | if (!IS_ERR(dst)) { |
807 | skb_dst_set(buff, dst); | |
b903d324 | 808 | ip6_xmit(ctl_sk, buff, &fl6, NULL, tclass); |
68d0c6d3 DM |
809 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
810 | if (rst) | |
811 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
812 | return; | |
1da177e4 LT |
813 | } |
814 | ||
815 | kfree_skb(buff); | |
816 | } | |
817 | ||
626e264d | 818 | static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 819 | { |
cf533ea5 | 820 | const struct tcphdr *th = tcp_hdr(skb); |
626e264d | 821 | u32 seq = 0, ack_seq = 0; |
fa3e5b4e | 822 | struct tcp_md5sig_key *key = NULL; |
658ddaaf SL |
823 | #ifdef CONFIG_TCP_MD5SIG |
824 | const __u8 *hash_location = NULL; | |
825 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
826 | unsigned char newhash[16]; | |
827 | int genhash; | |
828 | struct sock *sk1 = NULL; | |
829 | #endif | |
1da177e4 | 830 | |
626e264d | 831 | if (th->rst) |
1da177e4 LT |
832 | return; |
833 | ||
626e264d IJ |
834 | if (!ipv6_unicast_destination(skb)) |
835 | return; | |
1da177e4 | 836 | |
cfb6eeb4 | 837 | #ifdef CONFIG_TCP_MD5SIG |
658ddaaf SL |
838 | hash_location = tcp_parse_md5sig_option(th); |
839 | if (!sk && hash_location) { | |
840 | /* | |
841 | * active side is lost. Try to find listening socket through | |
842 | * source port, and then find md5 key through listening socket. | |
843 | * we are not loose security here: | |
844 | * Incoming packet is checked with md5 hash with finding key, | |
845 | * no RST generated if md5 hash doesn't match. | |
846 | */ | |
847 | sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev), | |
5ba24953 TH |
848 | &tcp_hashinfo, &ipv6h->saddr, |
849 | th->source, &ipv6h->daddr, | |
658ddaaf SL |
850 | ntohs(th->source), inet6_iif(skb)); |
851 | if (!sk1) | |
852 | return; | |
853 | ||
854 | rcu_read_lock(); | |
855 | key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr); | |
856 | if (!key) | |
857 | goto release_sk1; | |
858 | ||
859 | genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
860 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
861 | goto release_sk1; | |
862 | } else { | |
863 | key = sk ? tcp_v6_md5_do_lookup(sk, &ipv6h->saddr) : NULL; | |
864 | } | |
cfb6eeb4 YH |
865 | #endif |
866 | ||
626e264d IJ |
867 | if (th->ack) |
868 | seq = ntohl(th->ack_seq); | |
869 | else | |
870 | ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - | |
871 | (th->doff << 2); | |
1da177e4 | 872 | |
ee684b6f | 873 | tcp_v6_send_response(skb, seq, ack_seq, 0, 0, 0, key, 1, 0); |
658ddaaf SL |
874 | |
875 | #ifdef CONFIG_TCP_MD5SIG | |
876 | release_sk1: | |
877 | if (sk1) { | |
878 | rcu_read_unlock(); | |
879 | sock_put(sk1); | |
880 | } | |
881 | #endif | |
626e264d | 882 | } |
1da177e4 | 883 | |
ee684b6f AV |
884 | static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
885 | u32 win, u32 tsval, u32 tsecr, | |
b903d324 | 886 | struct tcp_md5sig_key *key, u8 tclass) |
626e264d | 887 | { |
ee684b6f | 888 | tcp_v6_send_response(skb, seq, ack, win, tsval, tsecr, key, 0, tclass); |
1da177e4 LT |
889 | } |
890 | ||
891 | static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
892 | { | |
8feaf0c0 | 893 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 894 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 895 | |
9501f972 | 896 | tcp_v6_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
8feaf0c0 | 897 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 898 | tcp_time_stamp + tcptw->tw_ts_offset, |
b903d324 ED |
899 | tcptw->tw_ts_recent, tcp_twsk_md5_key(tcptw), |
900 | tw->tw_tclass); | |
1da177e4 | 901 | |
8feaf0c0 | 902 | inet_twsk_put(tw); |
1da177e4 LT |
903 | } |
904 | ||
6edafaaf GJ |
905 | static void tcp_v6_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
906 | struct request_sock *req) | |
1da177e4 | 907 | { |
ee684b6f AV |
908 | tcp_v6_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, |
909 | req->rcv_wnd, tcp_time_stamp, req->ts_recent, | |
b903d324 | 910 | tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr), 0); |
1da177e4 LT |
911 | } |
912 | ||
913 | ||
914 | static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) | |
915 | { | |
60236fdd | 916 | struct request_sock *req, **prev; |
aa8223c7 | 917 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
918 | struct sock *nsk; |
919 | ||
920 | /* Find possible connection requests. */ | |
8129765a | 921 | req = inet6_csk_search_req(sk, &prev, th->source, |
0660e03f ACM |
922 | &ipv6_hdr(skb)->saddr, |
923 | &ipv6_hdr(skb)->daddr, inet6_iif(skb)); | |
1da177e4 | 924 | if (req) |
8336886f | 925 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 926 | |
3b1e0a65 | 927 | nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
d86e0dac PE |
928 | &ipv6_hdr(skb)->saddr, th->source, |
929 | &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); | |
1da177e4 LT |
930 | |
931 | if (nsk) { | |
932 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
933 | bh_lock_sock(nsk); | |
934 | return nsk; | |
935 | } | |
9469c7b4 | 936 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
937 | return NULL; |
938 | } | |
939 | ||
c6aefafb | 940 | #ifdef CONFIG_SYN_COOKIES |
af9b4738 | 941 | if (!th->syn) |
c6aefafb | 942 | sk = cookie_v6_check(sk, skb); |
1da177e4 LT |
943 | #endif |
944 | return sk; | |
945 | } | |
946 | ||
1da177e4 LT |
947 | /* FIXME: this is substantially similar to the ipv4 code. |
948 | * Can some kind of merge be done? -- erics | |
949 | */ | |
950 | static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) | |
951 | { | |
e6b4d113 WAS |
952 | struct tcp_options_received tmp_opt; |
953 | struct request_sock *req; | |
ca304b61 | 954 | struct inet6_request_sock *treq; |
1da177e4 | 955 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 | 956 | struct tcp_sock *tp = tcp_sk(sk); |
e6b4d113 | 957 | __u32 isn = TCP_SKB_CB(skb)->when; |
493f377d | 958 | struct dst_entry *dst = NULL; |
3840a06e | 959 | struct flowi6 fl6; |
a2a385d6 | 960 | bool want_cookie = false; |
1da177e4 LT |
961 | |
962 | if (skb->protocol == htons(ETH_P_IP)) | |
963 | return tcp_v4_conn_request(sk, skb); | |
964 | ||
965 | if (!ipv6_unicast_destination(skb)) | |
1ab1457c | 966 | goto drop; |
1da177e4 | 967 | |
463c84b9 | 968 | if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
946cedcc ED |
969 | want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6"); |
970 | if (!want_cookie) | |
971 | goto drop; | |
1da177e4 LT |
972 | } |
973 | ||
5f1e942c VS |
974 | if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) { |
975 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); | |
1da177e4 | 976 | goto drop; |
5f1e942c | 977 | } |
1da177e4 | 978 | |
ca304b61 | 979 | req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
1da177e4 LT |
980 | if (req == NULL) |
981 | goto drop; | |
982 | ||
cfb6eeb4 YH |
983 | #ifdef CONFIG_TCP_MD5SIG |
984 | tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; | |
985 | #endif | |
986 | ||
1da177e4 LT |
987 | tcp_clear_options(&tmp_opt); |
988 | tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); | |
989 | tmp_opt.user_mss = tp->rx_opt.user_mss; | |
1a2c6181 | 990 | tcp_parse_options(skb, &tmp_opt, 0, NULL); |
1da177e4 | 991 | |
4dfc2817 | 992 | if (want_cookie && !tmp_opt.saw_tstamp) |
c6aefafb | 993 | tcp_clear_options(&tmp_opt); |
c6aefafb | 994 | |
1da177e4 LT |
995 | tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
996 | tcp_openreq_init(req, &tmp_opt, skb); | |
997 | ||
ca304b61 | 998 | treq = inet6_rsk(req); |
4e3fd7a0 AD |
999 | treq->rmt_addr = ipv6_hdr(skb)->saddr; |
1000 | treq->loc_addr = ipv6_hdr(skb)->daddr; | |
172d69e6 | 1001 | if (!want_cookie || tmp_opt.tstamp_ok) |
5d134f1c | 1002 | TCP_ECN_create_request(req, skb, sock_net(sk)); |
c6aefafb | 1003 | |
4d0fe50c | 1004 | treq->iif = sk->sk_bound_dev_if; |
6fa3eb70 | 1005 | inet_rsk(req)->ir_mark = inet_request_mark(sk, skb); |
4d0fe50c ED |
1006 | |
1007 | /* So that link locals have meaning */ | |
1008 | if (!sk->sk_bound_dev_if && | |
1009 | ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) | |
1010 | treq->iif = inet6_iif(skb); | |
1011 | ||
2bbdf389 | 1012 | if (!isn) { |
c6aefafb GG |
1013 | if (ipv6_opt_accepted(sk, skb) || |
1014 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || | |
1015 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { | |
1016 | atomic_inc(&skb->users); | |
1017 | treq->pktopts = skb; | |
1018 | } | |
493f377d DM |
1019 | |
1020 | if (want_cookie) { | |
2bbdf389 FW |
1021 | isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
1022 | req->cookie_ts = tmp_opt.tstamp_ok; | |
493f377d DM |
1023 | goto have_isn; |
1024 | } | |
1025 | ||
1026 | /* VJ's idea. We save last timestamp seen | |
1027 | * from the destination in peer table, when entering | |
1028 | * state TIME-WAIT, and check against it before | |
1029 | * accepting new connection request. | |
1030 | * | |
1031 | * If "isn" is not zero, this request hit alive | |
1032 | * timewait bucket, so that all the necessary checks | |
1033 | * are made in the function processing timewait state. | |
1034 | */ | |
1035 | if (tmp_opt.saw_tstamp && | |
1036 | tcp_death_row.sysctl_tw_recycle && | |
81166dd6 DM |
1037 | (dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) { |
1038 | if (!tcp_peer_is_proven(req, dst, true)) { | |
493f377d DM |
1039 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED); |
1040 | goto drop_and_release; | |
1041 | } | |
1042 | } | |
1043 | /* Kill the following clause, if you dislike this way. */ | |
1044 | else if (!sysctl_tcp_syncookies && | |
1045 | (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) < | |
1046 | (sysctl_max_syn_backlog >> 2)) && | |
81166dd6 | 1047 | !tcp_peer_is_proven(req, dst, false)) { |
493f377d DM |
1048 | /* Without syncookies last quarter of |
1049 | * backlog is filled with destinations, | |
1050 | * proven to be alive. | |
1051 | * It means that we continue to communicate | |
1052 | * to destinations, already remembered | |
1053 | * to the moment of synflood. | |
1054 | */ | |
1055 | LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n", | |
1056 | &treq->rmt_addr, ntohs(tcp_hdr(skb)->source)); | |
1057 | goto drop_and_release; | |
2bbdf389 | 1058 | } |
493f377d DM |
1059 | |
1060 | isn = tcp_v6_init_sequence(skb); | |
c6aefafb | 1061 | } |
493f377d | 1062 | have_isn: |
2e6599cb | 1063 | tcp_rsk(req)->snt_isn = isn; |
1da177e4 | 1064 | |
437c5b53 NC |
1065 | if (security_inet_conn_request(sk, skb, req)) |
1066 | goto drop_and_release; | |
4237c75c | 1067 | |
9f10d3f6 | 1068 | if (tcp_v6_send_synack(sk, dst, &fl6, req, |
fff32699 | 1069 | skb_get_queue_mapping(skb)) || |
4957faad | 1070 | want_cookie) |
e6b4d113 | 1071 | goto drop_and_free; |
1da177e4 | 1072 | |
016818d0 | 1073 | tcp_rsk(req)->snt_synack = tcp_time_stamp; |
8336886f | 1074 | tcp_rsk(req)->listener = NULL; |
e6b4d113 WAS |
1075 | inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
1076 | return 0; | |
1da177e4 | 1077 | |
493f377d DM |
1078 | drop_and_release: |
1079 | dst_release(dst); | |
e6b4d113 WAS |
1080 | drop_and_free: |
1081 | reqsk_free(req); | |
1da177e4 | 1082 | drop: |
5f1e942c | 1083 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1084 | return 0; /* don't send reset */ |
1085 | } | |
1086 | ||
1087 | static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1088 | struct request_sock *req, |
1da177e4 LT |
1089 | struct dst_entry *dst) |
1090 | { | |
78d15e82 | 1091 | struct inet6_request_sock *treq; |
1da177e4 LT |
1092 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
1093 | struct tcp6_sock *newtcp6sk; | |
1094 | struct inet_sock *newinet; | |
1095 | struct tcp_sock *newtp; | |
1096 | struct sock *newsk; | |
cfb6eeb4 YH |
1097 | #ifdef CONFIG_TCP_MD5SIG |
1098 | struct tcp_md5sig_key *key; | |
1099 | #endif | |
3840a06e | 1100 | struct flowi6 fl6; |
1da177e4 LT |
1101 | |
1102 | if (skb->protocol == htons(ETH_P_IP)) { | |
1103 | /* | |
1104 | * v6 mapped | |
1105 | */ | |
1106 | ||
1107 | newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); | |
1108 | ||
1ab1457c | 1109 | if (newsk == NULL) |
1da177e4 LT |
1110 | return NULL; |
1111 | ||
1112 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1113 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1114 | ||
1115 | newinet = inet_sk(newsk); | |
1116 | newnp = inet6_sk(newsk); | |
1117 | newtp = tcp_sk(newsk); | |
1118 | ||
1119 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1120 | ||
c720c7e8 | 1121 | ipv6_addr_set_v4mapped(newinet->inet_daddr, &newnp->daddr); |
1da177e4 | 1122 | |
c720c7e8 | 1123 | ipv6_addr_set_v4mapped(newinet->inet_saddr, &newnp->saddr); |
1da177e4 | 1124 | |
4e3fd7a0 | 1125 | newnp->rcv_saddr = newnp->saddr; |
1da177e4 | 1126 | |
8292a17a | 1127 | inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
1da177e4 | 1128 | newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
cfb6eeb4 YH |
1129 | #ifdef CONFIG_TCP_MD5SIG |
1130 | newtp->af_specific = &tcp_sock_ipv6_mapped_specific; | |
1131 | #endif | |
1132 | ||
676a1184 YZ |
1133 | newnp->ipv6_ac_list = NULL; |
1134 | newnp->ipv6_fl_list = NULL; | |
1da177e4 LT |
1135 | newnp->pktoptions = NULL; |
1136 | newnp->opt = NULL; | |
505cbfc5 | 1137 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1138 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1139 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 | 1140 | |
e6848976 ACM |
1141 | /* |
1142 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count | |
1143 | * here, tcp_create_openreq_child now does this for us, see the comment in | |
1144 | * that function for the gory details. -acme | |
1da177e4 | 1145 | */ |
1da177e4 LT |
1146 | |
1147 | /* It is tricky place. Until this moment IPv4 tcp | |
8292a17a | 1148 | worked with IPv6 icsk.icsk_af_ops. |
1da177e4 LT |
1149 | Sync it now. |
1150 | */ | |
d83d8461 | 1151 | tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
1da177e4 LT |
1152 | |
1153 | return newsk; | |
1154 | } | |
1155 | ||
78d15e82 | 1156 | treq = inet6_rsk(req); |
1da177e4 LT |
1157 | |
1158 | if (sk_acceptq_is_full(sk)) | |
1159 | goto out_overflow; | |
1160 | ||
493f377d | 1161 | if (!dst) { |
3840a06e | 1162 | dst = inet6_csk_route_req(sk, &fl6, req); |
493f377d | 1163 | if (!dst) |
1da177e4 | 1164 | goto out; |
1ab1457c | 1165 | } |
1da177e4 LT |
1166 | |
1167 | newsk = tcp_create_openreq_child(sk, req, skb); | |
1168 | if (newsk == NULL) | |
093d2823 | 1169 | goto out_nonewsk; |
1da177e4 | 1170 | |
e6848976 ACM |
1171 | /* |
1172 | * No need to charge this sock to the relevant IPv6 refcnt debug socks | |
1173 | * count here, tcp_create_openreq_child now does this for us, see the | |
1174 | * comment in that function for the gory details. -acme | |
1175 | */ | |
1da177e4 | 1176 | |
59eed279 | 1177 | newsk->sk_gso_type = SKB_GSO_TCPV6; |
8e1ef0a9 | 1178 | __ip6_dst_store(newsk, dst, NULL, NULL); |
fae6ef87 | 1179 | inet6_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1180 | |
1181 | newtcp6sk = (struct tcp6_sock *)newsk; | |
1182 | inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; | |
1183 | ||
1184 | newtp = tcp_sk(newsk); | |
1185 | newinet = inet_sk(newsk); | |
1186 | newnp = inet6_sk(newsk); | |
1187 | ||
1188 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
1189 | ||
4e3fd7a0 AD |
1190 | newnp->daddr = treq->rmt_addr; |
1191 | newnp->saddr = treq->loc_addr; | |
1192 | newnp->rcv_saddr = treq->loc_addr; | |
2e6599cb | 1193 | newsk->sk_bound_dev_if = treq->iif; |
1da177e4 | 1194 | |
1ab1457c | 1195 | /* Now IPv6 options... |
1da177e4 LT |
1196 | |
1197 | First: no IPv4 options. | |
1198 | */ | |
f6d8bd05 | 1199 | newinet->inet_opt = NULL; |
676a1184 | 1200 | newnp->ipv6_ac_list = NULL; |
d35690be | 1201 | newnp->ipv6_fl_list = NULL; |
1da177e4 LT |
1202 | |
1203 | /* Clone RX bits */ | |
1204 | newnp->rxopt.all = np->rxopt.all; | |
1205 | ||
1206 | /* Clone pktoptions received with SYN */ | |
1207 | newnp->pktoptions = NULL; | |
2e6599cb | 1208 | if (treq->pktopts != NULL) { |
99a1dec7 MG |
1209 | newnp->pktoptions = skb_clone(treq->pktopts, |
1210 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
ab185d7b | 1211 | consume_skb(treq->pktopts); |
2e6599cb | 1212 | treq->pktopts = NULL; |
1da177e4 LT |
1213 | if (newnp->pktoptions) |
1214 | skb_set_owner_r(newnp->pktoptions, newsk); | |
1215 | } | |
1216 | newnp->opt = NULL; | |
505cbfc5 | 1217 | newnp->mcast_oif = inet6_iif(skb); |
0660e03f | 1218 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
e7219858 | 1219 | newnp->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
1da177e4 LT |
1220 | |
1221 | /* Clone native IPv6 options from listening socket (if any) | |
1222 | ||
1223 | Yes, keeping reference count would be much more clever, | |
1224 | but we make one more one thing there: reattach optmem | |
1225 | to newsk. | |
1226 | */ | |
43264e0b RL |
1227 | if (np->opt) |
1228 | newnp->opt = ipv6_dup_options(newsk, np->opt); | |
1da177e4 | 1229 | |
d83d8461 | 1230 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
1da177e4 | 1231 | if (newnp->opt) |
d83d8461 ACM |
1232 | inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
1233 | newnp->opt->opt_flen); | |
1da177e4 | 1234 | |
5d424d5a | 1235 | tcp_mtup_init(newsk); |
1da177e4 | 1236 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1237 | newtp->advmss = dst_metric_advmss(dst); |
d135c522 NC |
1238 | if (tcp_sk(sk)->rx_opt.user_mss && |
1239 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1240 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1241 | ||
1da177e4 | 1242 | tcp_initialize_rcv_mss(newsk); |
623df484 | 1243 | tcp_synack_rtt_meas(newsk, req); |
e6c022a4 | 1244 | newtp->total_retrans = req->num_retrans; |
1da177e4 | 1245 | |
c720c7e8 ED |
1246 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
1247 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
1da177e4 | 1248 | |
cfb6eeb4 YH |
1249 | #ifdef CONFIG_TCP_MD5SIG |
1250 | /* Copy over the MD5 key from the original socket */ | |
1251 | if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { | |
1252 | /* We're using one, so create a matching key | |
1253 | * on the newsk structure. If we fail to get | |
1254 | * memory, then we end up not copying the key | |
1255 | * across. Shucks. | |
1256 | */ | |
a915da9b | 1257 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newnp->daddr, |
99a1dec7 MG |
1258 | AF_INET6, key->key, key->keylen, |
1259 | sk_gfp_atomic(sk, GFP_ATOMIC)); | |
cfb6eeb4 YH |
1260 | } |
1261 | #endif | |
1262 | ||
093d2823 | 1263 | if (__inet_inherit_port(sk, newsk) < 0) { |
e337e24d CP |
1264 | inet_csk_prepare_forced_close(newsk); |
1265 | tcp_done(newsk); | |
093d2823 BS |
1266 | goto out; |
1267 | } | |
9327f705 | 1268 | __inet6_hash(newsk, NULL); |
1da177e4 LT |
1269 | |
1270 | return newsk; | |
1271 | ||
1272 | out_overflow: | |
de0744af | 1273 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 | 1274 | out_nonewsk: |
1da177e4 | 1275 | dst_release(dst); |
093d2823 BS |
1276 | out: |
1277 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); | |
1da177e4 LT |
1278 | return NULL; |
1279 | } | |
1280 | ||
b51655b9 | 1281 | static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
1da177e4 | 1282 | { |
84fa7933 | 1283 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
684f2176 | 1284 | if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr, |
0660e03f | 1285 | &ipv6_hdr(skb)->daddr, skb->csum)) { |
fb286bb2 | 1286 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1287 | return 0; |
fb286bb2 | 1288 | } |
1da177e4 | 1289 | } |
fb286bb2 | 1290 | |
684f2176 | 1291 | skb->csum = ~csum_unfold(tcp_v6_check(skb->len, |
0660e03f ACM |
1292 | &ipv6_hdr(skb)->saddr, |
1293 | &ipv6_hdr(skb)->daddr, 0)); | |
fb286bb2 | 1294 | |
1da177e4 | 1295 | if (skb->len <= 76) { |
fb286bb2 | 1296 | return __skb_checksum_complete(skb); |
1da177e4 LT |
1297 | } |
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | /* The socket must have it's spinlock held when we get | |
1302 | * here. | |
1303 | * | |
1304 | * We have a potential double-lock case here, so even when | |
1305 | * doing backlog processing we use the BH locking scheme. | |
1306 | * This is because we cannot sleep with the original spinlock | |
1307 | * held. | |
1308 | */ | |
1309 | static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1310 | { | |
1311 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1312 | struct tcp_sock *tp; | |
1313 | struct sk_buff *opt_skb = NULL; | |
1314 | ||
1315 | /* Imagine: socket is IPv6. IPv4 packet arrives, | |
1316 | goes to IPv4 receive handler and backlogged. | |
1317 | From backlog it always goes here. Kerboom... | |
1318 | Fortunately, tcp_rcv_established and rcv_established | |
1319 | handle them correctly, but it is not case with | |
1320 | tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK | |
1321 | */ | |
1322 | ||
1323 | if (skb->protocol == htons(ETH_P_IP)) | |
1324 | return tcp_v4_do_rcv(sk, skb); | |
1325 | ||
cfb6eeb4 YH |
1326 | #ifdef CONFIG_TCP_MD5SIG |
1327 | if (tcp_v6_inbound_md5_hash (sk, skb)) | |
1328 | goto discard; | |
1329 | #endif | |
1330 | ||
fda9ef5d | 1331 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1332 | goto discard; |
1333 | ||
1334 | /* | |
1335 | * socket locking is here for SMP purposes as backlog rcv | |
1336 | * is currently called with bh processing disabled. | |
1337 | */ | |
1338 | ||
1339 | /* Do Stevens' IPV6_PKTOPTIONS. | |
1340 | ||
1341 | Yes, guys, it is the only place in our code, where we | |
1342 | may make it not affecting IPv4. | |
1343 | The rest of code is protocol independent, | |
1344 | and I do not like idea to uglify IPv4. | |
1345 | ||
1346 | Actually, all the idea behind IPV6_PKTOPTIONS | |
1347 | looks not very well thought. For now we latch | |
1348 | options, received in the last packet, enqueued | |
1349 | by tcp. Feel free to propose better solution. | |
1ab1457c | 1350 | --ANK (980728) |
1da177e4 LT |
1351 | */ |
1352 | if (np->rxopt.all) | |
99a1dec7 | 1353 | opt_skb = skb_clone(skb, sk_gfp_atomic(sk, GFP_ATOMIC)); |
1da177e4 LT |
1354 | |
1355 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ | |
5d299f3d ED |
1356 | struct dst_entry *dst = sk->sk_rx_dst; |
1357 | ||
bdeab991 | 1358 | sock_rps_save_rxhash(sk, skb); |
5d299f3d ED |
1359 | if (dst) { |
1360 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || | |
1361 | dst->ops->check(dst, np->rx_dst_cookie) == NULL) { | |
1362 | dst_release(dst); | |
1363 | sk->sk_rx_dst = NULL; | |
1364 | } | |
1365 | } | |
1366 | ||
aa8223c7 | 1367 | if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1368 | goto reset; |
1da177e4 LT |
1369 | if (opt_skb) |
1370 | goto ipv6_pktoptions; | |
1371 | return 0; | |
1372 | } | |
1373 | ||
ab6a5bb6 | 1374 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1375 | goto csum_err; |
1376 | ||
1ab1457c | 1377 | if (sk->sk_state == TCP_LISTEN) { |
1da177e4 LT |
1378 | struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
1379 | if (!nsk) | |
1380 | goto discard; | |
1381 | ||
1382 | /* | |
1383 | * Queue it on the new socket if the new socket is active, | |
1384 | * otherwise we just shortcircuit this and continue with | |
1385 | * the new socket.. | |
1386 | */ | |
1ab1457c | 1387 | if(nsk != sk) { |
bdeab991 | 1388 | sock_rps_save_rxhash(nsk, skb); |
1da177e4 LT |
1389 | if (tcp_child_process(sk, nsk, skb)) |
1390 | goto reset; | |
1391 | if (opt_skb) | |
1392 | __kfree_skb(opt_skb); | |
1393 | return 0; | |
1394 | } | |
47482f13 | 1395 | } else |
bdeab991 | 1396 | sock_rps_save_rxhash(sk, skb); |
1da177e4 | 1397 | |
aa8223c7 | 1398 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
1da177e4 | 1399 | goto reset; |
1da177e4 LT |
1400 | if (opt_skb) |
1401 | goto ipv6_pktoptions; | |
1402 | return 0; | |
1403 | ||
1404 | reset: | |
cfb6eeb4 | 1405 | tcp_v6_send_reset(sk, skb); |
1da177e4 LT |
1406 | discard: |
1407 | if (opt_skb) | |
1408 | __kfree_skb(opt_skb); | |
1409 | kfree_skb(skb); | |
1410 | return 0; | |
1411 | csum_err: | |
6a5dc9e5 | 1412 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1413 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1414 | goto discard; |
1415 | ||
1416 | ||
1417 | ipv6_pktoptions: | |
1418 | /* Do you ask, what is it? | |
1419 | ||
1420 | 1. skb was enqueued by tcp. | |
1421 | 2. skb is added to tail of read queue, rather than out of order. | |
1422 | 3. socket is not in passive state. | |
1423 | 4. Finally, it really contains options, which user wants to receive. | |
1424 | */ | |
1425 | tp = tcp_sk(sk); | |
1426 | if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && | |
1427 | !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { | |
333fad53 | 1428 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
505cbfc5 | 1429 | np->mcast_oif = inet6_iif(opt_skb); |
333fad53 | 1430 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
0660e03f | 1431 | np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
4c507d28 | 1432 | if (np->rxopt.bits.rxtclass) |
a22eb149 | 1433 | np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb)); |
1da177e4 LT |
1434 | if (ipv6_opt_accepted(sk, opt_skb)) { |
1435 | skb_set_owner_r(opt_skb, sk); | |
1436 | opt_skb = xchg(&np->pktoptions, opt_skb); | |
1437 | } else { | |
1438 | __kfree_skb(opt_skb); | |
1439 | opt_skb = xchg(&np->pktoptions, NULL); | |
1440 | } | |
1441 | } | |
1442 | ||
800d55f1 | 1443 | kfree_skb(opt_skb); |
1da177e4 LT |
1444 | return 0; |
1445 | } | |
1446 | ||
e5bbef20 | 1447 | static int tcp_v6_rcv(struct sk_buff *skb) |
1da177e4 | 1448 | { |
cf533ea5 | 1449 | const struct tcphdr *th; |
b71d1d42 | 1450 | const struct ipv6hdr *hdr; |
1da177e4 LT |
1451 | struct sock *sk; |
1452 | int ret; | |
a86b1e30 | 1453 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1454 | |
1455 | if (skb->pkt_type != PACKET_HOST) | |
1456 | goto discard_it; | |
1457 | ||
1458 | /* | |
1459 | * Count it even if it's bad. | |
1460 | */ | |
63231bdd | 1461 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1462 | |
1463 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1464 | goto discard_it; | |
1465 | ||
aa8223c7 | 1466 | th = tcp_hdr(skb); |
1da177e4 LT |
1467 | |
1468 | if (th->doff < sizeof(struct tcphdr)/4) | |
1469 | goto bad_packet; | |
1470 | if (!pskb_may_pull(skb, th->doff*4)) | |
1471 | goto discard_it; | |
1472 | ||
60476372 | 1473 | if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
6a5dc9e5 | 1474 | goto csum_error; |
1da177e4 | 1475 | |
aa8223c7 | 1476 | th = tcp_hdr(skb); |
e802af9c | 1477 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
1478 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1479 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1480 | skb->len - th->doff*4); | |
1481 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
1482 | TCP_SKB_CB(skb)->when = 0; | |
b82d1bb4 | 1483 | TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr); |
1da177e4 LT |
1484 | TCP_SKB_CB(skb)->sacked = 0; |
1485 | ||
9a1f27c4 | 1486 | sk = __inet6_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1487 | if (!sk) |
1488 | goto no_tcp_socket; | |
1489 | ||
1490 | process: | |
1491 | if (sk->sk_state == TCP_TIME_WAIT) | |
1492 | goto do_time_wait; | |
1493 | ||
e802af9c SH |
1494 | if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) { |
1495 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
1496 | goto discard_and_relse; | |
1497 | } | |
1498 | ||
1da177e4 LT |
1499 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
1500 | goto discard_and_relse; | |
1501 | ||
fda9ef5d | 1502 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1503 | goto discard_and_relse; |
1504 | ||
1505 | skb->dev = NULL; | |
1506 | ||
293b9c42 | 1507 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1508 | ret = 0; |
1509 | if (!sock_owned_by_user(sk)) { | |
1a2449a8 | 1510 | #ifdef CONFIG_NET_DMA |
1ab1457c | 1511 | struct tcp_sock *tp = tcp_sk(sk); |
b4caea8a | 1512 | if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
a2bd1140 | 1513 | tp->ucopy.dma_chan = net_dma_find_channel(); |
1ab1457c YH |
1514 | if (tp->ucopy.dma_chan) |
1515 | ret = tcp_v6_do_rcv(sk, skb); | |
1516 | else | |
1a2449a8 CL |
1517 | #endif |
1518 | { | |
1519 | if (!tcp_prequeue(sk, skb)) | |
1520 | ret = tcp_v6_do_rcv(sk, skb); | |
1521 | } | |
da882c1f ED |
1522 | } else if (unlikely(sk_add_backlog(sk, skb, |
1523 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1524 | bh_unlock_sock(sk); |
6cce09f8 | 1525 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1526 | goto discard_and_relse; |
1527 | } | |
1da177e4 LT |
1528 | bh_unlock_sock(sk); |
1529 | ||
1530 | sock_put(sk); | |
1531 | return ret ? -1 : 0; | |
1532 | ||
1533 | no_tcp_socket: | |
1534 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1535 | goto discard_it; | |
1536 | ||
1537 | if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1538 | csum_error: |
1539 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1540 | bad_packet: |
63231bdd | 1541 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1542 | } else { |
cfb6eeb4 | 1543 | tcp_v6_send_reset(NULL, skb); |
1da177e4 LT |
1544 | } |
1545 | ||
1546 | discard_it: | |
1da177e4 LT |
1547 | kfree_skb(skb); |
1548 | return 0; | |
1549 | ||
1550 | discard_and_relse: | |
1551 | sock_put(sk); | |
1552 | goto discard_it; | |
1553 | ||
1554 | do_time_wait: | |
1555 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1556 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1557 | goto discard_it; |
1558 | } | |
1559 | ||
6a5dc9e5 | 1560 | if (skb->len < (th->doff<<2)) { |
9469c7b4 | 1561 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1562 | goto bad_packet; |
1563 | } | |
1564 | if (tcp_checksum_complete(skb)) { | |
1565 | inet_twsk_put(inet_twsk(sk)); | |
1566 | goto csum_error; | |
1da177e4 LT |
1567 | } |
1568 | ||
9469c7b4 | 1569 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 LT |
1570 | case TCP_TW_SYN: |
1571 | { | |
1572 | struct sock *sk2; | |
1573 | ||
c346dca1 | 1574 | sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
5ba24953 | 1575 | &ipv6_hdr(skb)->saddr, th->source, |
0660e03f | 1576 | &ipv6_hdr(skb)->daddr, |
505cbfc5 | 1577 | ntohs(th->dest), inet6_iif(skb)); |
1da177e4 | 1578 | if (sk2 != NULL) { |
295ff7ed ACM |
1579 | struct inet_timewait_sock *tw = inet_twsk(sk); |
1580 | inet_twsk_deschedule(tw, &tcp_death_row); | |
1581 | inet_twsk_put(tw); | |
1da177e4 LT |
1582 | sk = sk2; |
1583 | goto process; | |
1584 | } | |
1585 | /* Fall through to ACK */ | |
1586 | } | |
1587 | case TCP_TW_ACK: | |
1588 | tcp_v6_timewait_ack(sk, skb); | |
1589 | break; | |
1590 | case TCP_TW_RST: | |
1591 | goto no_tcp_socket; | |
1592 | case TCP_TW_SUCCESS:; | |
1593 | } | |
1594 | goto discard_it; | |
1595 | } | |
1596 | ||
c7109986 ED |
1597 | static void tcp_v6_early_demux(struct sk_buff *skb) |
1598 | { | |
1599 | const struct ipv6hdr *hdr; | |
1600 | const struct tcphdr *th; | |
1601 | struct sock *sk; | |
1602 | ||
1603 | if (skb->pkt_type != PACKET_HOST) | |
1604 | return; | |
1605 | ||
1606 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) | |
1607 | return; | |
1608 | ||
1609 | hdr = ipv6_hdr(skb); | |
1610 | th = tcp_hdr(skb); | |
1611 | ||
1612 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1613 | return; | |
1614 | ||
1615 | sk = __inet6_lookup_established(dev_net(skb->dev), &tcp_hashinfo, | |
1616 | &hdr->saddr, th->source, | |
1617 | &hdr->daddr, ntohs(th->dest), | |
1618 | inet6_iif(skb)); | |
1619 | if (sk) { | |
1620 | skb->sk = sk; | |
1621 | skb->destructor = sock_edemux; | |
1622 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1b946e38 | 1623 | struct dst_entry *dst = ACCESS_ONCE(sk->sk_rx_dst); |
f3f12135 | 1624 | |
c7109986 | 1625 | if (dst) |
5d299f3d | 1626 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); |
c7109986 | 1627 | if (dst && |
f3f12135 | 1628 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
c7109986 ED |
1629 | skb_dst_set_noref(skb, dst); |
1630 | } | |
1631 | } | |
1632 | } | |
1633 | ||
ccb7c410 DM |
1634 | static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
1635 | .twsk_obj_size = sizeof(struct tcp6_timewait_sock), | |
1636 | .twsk_unique = tcp_twsk_unique, | |
1637 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 DM |
1638 | }; |
1639 | ||
3b401a81 | 1640 | static const struct inet_connection_sock_af_ops ipv6_specific = { |
543d9cfe ACM |
1641 | .queue_xmit = inet6_csk_xmit, |
1642 | .send_check = tcp_v6_send_check, | |
1643 | .rebuild_header = inet6_sk_rebuild_header, | |
5d299f3d | 1644 | .sk_rx_dst_set = inet6_sk_rx_dst_set, |
543d9cfe ACM |
1645 | .conn_request = tcp_v6_conn_request, |
1646 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe | 1647 | .net_header_len = sizeof(struct ipv6hdr), |
67469601 | 1648 | .net_frag_header_len = sizeof(struct frag_hdr), |
543d9cfe ACM |
1649 | .setsockopt = ipv6_setsockopt, |
1650 | .getsockopt = ipv6_getsockopt, | |
1651 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1652 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1653 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1654 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1655 | .compat_setsockopt = compat_ipv6_setsockopt, |
1656 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1657 | #endif |
5f80f4d8 | 1658 | .mtu_reduced = tcp_v6_mtu_reduced, |
1da177e4 LT |
1659 | }; |
1660 | ||
cfb6eeb4 | 1661 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1662 | static const struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
cfb6eeb4 | 1663 | .md5_lookup = tcp_v6_md5_lookup, |
49a72dfb | 1664 | .calc_md5_hash = tcp_v6_md5_hash_skb, |
cfb6eeb4 | 1665 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1666 | }; |
a928630a | 1667 | #endif |
cfb6eeb4 | 1668 | |
1da177e4 LT |
1669 | /* |
1670 | * TCP over IPv4 via INET6 API | |
1671 | */ | |
1672 | ||
3b401a81 | 1673 | static const struct inet_connection_sock_af_ops ipv6_mapped = { |
543d9cfe ACM |
1674 | .queue_xmit = ip_queue_xmit, |
1675 | .send_check = tcp_v4_send_check, | |
1676 | .rebuild_header = inet_sk_rebuild_header, | |
63d02d15 | 1677 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1678 | .conn_request = tcp_v6_conn_request, |
1679 | .syn_recv_sock = tcp_v6_syn_recv_sock, | |
543d9cfe ACM |
1680 | .net_header_len = sizeof(struct iphdr), |
1681 | .setsockopt = ipv6_setsockopt, | |
1682 | .getsockopt = ipv6_getsockopt, | |
1683 | .addr2sockaddr = inet6_csk_addr2sockaddr, | |
1684 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
ab1e0a13 | 1685 | .bind_conflict = inet6_csk_bind_conflict, |
3fdadf7d | 1686 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1687 | .compat_setsockopt = compat_ipv6_setsockopt, |
1688 | .compat_getsockopt = compat_ipv6_getsockopt, | |
3fdadf7d | 1689 | #endif |
5f80f4d8 | 1690 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 LT |
1691 | }; |
1692 | ||
cfb6eeb4 | 1693 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1694 | static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
cfb6eeb4 | 1695 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1696 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1697 | .md5_parse = tcp_v6_parse_md5_keys, |
cfb6eeb4 | 1698 | }; |
a928630a | 1699 | #endif |
cfb6eeb4 | 1700 | |
1da177e4 LT |
1701 | /* NOTE: A lot of things set to zero explicitly by call to |
1702 | * sk_alloc() so need not be done here. | |
1703 | */ | |
1704 | static int tcp_v6_init_sock(struct sock *sk) | |
1705 | { | |
6687e988 | 1706 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1707 | |
900f65d3 | 1708 | tcp_init_sock(sk); |
1da177e4 | 1709 | |
8292a17a | 1710 | icsk->icsk_af_ops = &ipv6_specific; |
1da177e4 | 1711 | |
cfb6eeb4 | 1712 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1713 | tcp_sk(sk)->af_specific = &tcp_sock_ipv6_specific; |
cfb6eeb4 YH |
1714 | #endif |
1715 | ||
1da177e4 LT |
1716 | return 0; |
1717 | } | |
1718 | ||
7d06b2e0 | 1719 | static void tcp_v6_destroy_sock(struct sock *sk) |
1da177e4 | 1720 | { |
1da177e4 | 1721 | tcp_v4_destroy_sock(sk); |
7d06b2e0 | 1722 | inet6_destroy_sock(sk); |
1da177e4 LT |
1723 | } |
1724 | ||
952a10be | 1725 | #ifdef CONFIG_PROC_FS |
1da177e4 | 1726 | /* Proc filesystem TCPv6 sock list dumping. */ |
1ab1457c | 1727 | static void get_openreq6(struct seq_file *seq, |
a7cb5a49 | 1728 | const struct sock *sk, struct request_sock *req, int i, kuid_t uid) |
1da177e4 | 1729 | { |
1da177e4 | 1730 | int ttd = req->expires - jiffies; |
b71d1d42 ED |
1731 | const struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
1732 | const struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; | |
1da177e4 LT |
1733 | |
1734 | if (ttd < 0) | |
1735 | ttd = 0; | |
1736 | ||
1da177e4 LT |
1737 | seq_printf(seq, |
1738 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1739 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1740 | i, |
1741 | src->s6_addr32[0], src->s6_addr32[1], | |
1742 | src->s6_addr32[2], src->s6_addr32[3], | |
fd507037 | 1743 | ntohs(inet_rsk(req)->loc_port), |
1da177e4 LT |
1744 | dest->s6_addr32[0], dest->s6_addr32[1], |
1745 | dest->s6_addr32[2], dest->s6_addr32[3], | |
2e6599cb | 1746 | ntohs(inet_rsk(req)->rmt_port), |
1da177e4 LT |
1747 | TCP_SYN_RECV, |
1748 | 0,0, /* could print option size, but that is af dependent. */ | |
1ab1457c YH |
1749 | 1, /* timers active (only the expire timer) */ |
1750 | jiffies_to_clock_t(ttd), | |
e6c022a4 | 1751 | req->num_timeout, |
a7cb5a49 | 1752 | from_kuid_munged(seq_user_ns(seq), uid), |
1ab1457c | 1753 | 0, /* non standard timer */ |
1da177e4 LT |
1754 | 0, /* open_requests have no inode */ |
1755 | 0, req); | |
1756 | } | |
1757 | ||
1758 | static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) | |
1759 | { | |
b71d1d42 | 1760 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1761 | __u16 destp, srcp; |
1762 | int timer_active; | |
1763 | unsigned long timer_expires; | |
cf533ea5 ED |
1764 | const struct inet_sock *inet = inet_sk(sp); |
1765 | const struct tcp_sock *tp = tcp_sk(sp); | |
463c84b9 | 1766 | const struct inet_connection_sock *icsk = inet_csk(sp); |
cf533ea5 | 1767 | const struct ipv6_pinfo *np = inet6_sk(sp); |
1da177e4 LT |
1768 | |
1769 | dest = &np->daddr; | |
1770 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1771 | destp = ntohs(inet->inet_dport); |
1772 | srcp = ntohs(inet->inet_sport); | |
463c84b9 ACM |
1773 | |
1774 | if (icsk->icsk_pending == ICSK_TIME_RETRANS) { | |
1da177e4 | 1775 | timer_active = 1; |
463c84b9 ACM |
1776 | timer_expires = icsk->icsk_timeout; |
1777 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 1778 | timer_active = 4; |
463c84b9 | 1779 | timer_expires = icsk->icsk_timeout; |
1da177e4 LT |
1780 | } else if (timer_pending(&sp->sk_timer)) { |
1781 | timer_active = 2; | |
1782 | timer_expires = sp->sk_timer.expires; | |
1783 | } else { | |
1784 | timer_active = 0; | |
1785 | timer_expires = jiffies; | |
1786 | } | |
1787 | ||
1788 | seq_printf(seq, | |
1789 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1790 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %lu %lu %u %u %d\n", |
1da177e4 LT |
1791 | i, |
1792 | src->s6_addr32[0], src->s6_addr32[1], | |
1793 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1794 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1795 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1796 | sp->sk_state, |
47da8ee6 SS |
1797 | tp->write_seq-tp->snd_una, |
1798 | (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), | |
1da177e4 | 1799 | timer_active, |
a399a805 | 1800 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 1801 | icsk->icsk_retransmits, |
a7cb5a49 | 1802 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
6687e988 | 1803 | icsk->icsk_probes_out, |
1da177e4 LT |
1804 | sock_i_ino(sp), |
1805 | atomic_read(&sp->sk_refcnt), sp, | |
7be87351 SH |
1806 | jiffies_to_clock_t(icsk->icsk_rto), |
1807 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 1808 | (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
0b6a05c1 IJ |
1809 | tp->snd_cwnd, |
1810 | tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh | |
1da177e4 LT |
1811 | ); |
1812 | } | |
1813 | ||
1ab1457c | 1814 | static void get_timewait6_sock(struct seq_file *seq, |
8feaf0c0 | 1815 | struct inet_timewait_sock *tw, int i) |
1da177e4 | 1816 | { |
b71d1d42 | 1817 | const struct in6_addr *dest, *src; |
1da177e4 | 1818 | __u16 destp, srcp; |
cf533ea5 | 1819 | const struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
a399a805 | 1820 | long delta = tw->tw_ttd - jiffies; |
1da177e4 | 1821 | |
0fa1a53e ACM |
1822 | dest = &tw6->tw_v6_daddr; |
1823 | src = &tw6->tw_v6_rcv_saddr; | |
1da177e4 LT |
1824 | destp = ntohs(tw->tw_dport); |
1825 | srcp = ntohs(tw->tw_sport); | |
1826 | ||
1827 | seq_printf(seq, | |
1828 | "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
71338aa7 | 1829 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK\n", |
1da177e4 LT |
1830 | i, |
1831 | src->s6_addr32[0], src->s6_addr32[1], | |
1832 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1833 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1834 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1835 | tw->tw_substate, 0, 0, | |
a399a805 | 1836 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
1da177e4 LT |
1837 | atomic_read(&tw->tw_refcnt), tw); |
1838 | } | |
1839 | ||
1da177e4 LT |
1840 | static int tcp6_seq_show(struct seq_file *seq, void *v) |
1841 | { | |
1842 | struct tcp_iter_state *st; | |
1843 | ||
1844 | if (v == SEQ_START_TOKEN) { | |
1845 | seq_puts(seq, | |
1846 | " sl " | |
1847 | "local_address " | |
1848 | "remote_address " | |
1849 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
1850 | " uid timeout inode\n"); | |
1851 | goto out; | |
1852 | } | |
1853 | st = seq->private; | |
1854 | ||
1855 | switch (st->state) { | |
1856 | case TCP_SEQ_STATE_LISTENING: | |
1857 | case TCP_SEQ_STATE_ESTABLISHED: | |
1858 | get_tcp6_sock(seq, v, st->num); | |
1859 | break; | |
1860 | case TCP_SEQ_STATE_OPENREQ: | |
1861 | get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); | |
1862 | break; | |
1863 | case TCP_SEQ_STATE_TIME_WAIT: | |
1864 | get_timewait6_sock(seq, v, st->num); | |
1865 | break; | |
1866 | } | |
1867 | out: | |
1868 | return 0; | |
1869 | } | |
1870 | ||
73cb88ec AV |
1871 | static const struct file_operations tcp6_afinfo_seq_fops = { |
1872 | .owner = THIS_MODULE, | |
1873 | .open = tcp_seq_open, | |
1874 | .read = seq_read, | |
1875 | .llseek = seq_lseek, | |
1876 | .release = seq_release_net | |
1877 | }; | |
1878 | ||
1da177e4 | 1879 | static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
1da177e4 LT |
1880 | .name = "tcp6", |
1881 | .family = AF_INET6, | |
73cb88ec | 1882 | .seq_fops = &tcp6_afinfo_seq_fops, |
9427c4b3 DL |
1883 | .seq_ops = { |
1884 | .show = tcp6_seq_show, | |
1885 | }, | |
1da177e4 LT |
1886 | }; |
1887 | ||
2c8c1e72 | 1888 | int __net_init tcp6_proc_init(struct net *net) |
1da177e4 | 1889 | { |
6f8b13bc | 1890 | return tcp_proc_register(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1891 | } |
1892 | ||
6f8b13bc | 1893 | void tcp6_proc_exit(struct net *net) |
1da177e4 | 1894 | { |
6f8b13bc | 1895 | tcp_proc_unregister(net, &tcp6_seq_afinfo); |
1da177e4 LT |
1896 | } |
1897 | #endif | |
1898 | ||
f77d6021 ED |
1899 | static void tcp_v6_clear_sk(struct sock *sk, int size) |
1900 | { | |
1901 | struct inet_sock *inet = inet_sk(sk); | |
1902 | ||
1903 | /* we do not want to clear pinet6 field, because of RCU lookups */ | |
1904 | sk_prot_clear_nulls(sk, offsetof(struct inet_sock, pinet6)); | |
1905 | ||
1906 | size -= offsetof(struct inet_sock, pinet6) + sizeof(inet->pinet6); | |
1907 | memset(&inet->pinet6 + 1, 0, size); | |
1908 | } | |
1909 | ||
1da177e4 LT |
1910 | struct proto tcpv6_prot = { |
1911 | .name = "TCPv6", | |
1912 | .owner = THIS_MODULE, | |
1913 | .close = tcp_close, | |
1914 | .connect = tcp_v6_connect, | |
1915 | .disconnect = tcp_disconnect, | |
463c84b9 | 1916 | .accept = inet_csk_accept, |
1da177e4 LT |
1917 | .ioctl = tcp_ioctl, |
1918 | .init = tcp_v6_init_sock, | |
1919 | .destroy = tcp_v6_destroy_sock, | |
1920 | .shutdown = tcp_shutdown, | |
1921 | .setsockopt = tcp_setsockopt, | |
1922 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 1923 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
1924 | .sendmsg = tcp_sendmsg, |
1925 | .sendpage = tcp_sendpage, | |
1da177e4 | 1926 | .backlog_rcv = tcp_v6_do_rcv, |
46d3ceab | 1927 | .release_cb = tcp_release_cb, |
1da177e4 | 1928 | .hash = tcp_v6_hash, |
ab1e0a13 ACM |
1929 | .unhash = inet_unhash, |
1930 | .get_port = inet_csk_get_port, | |
1da177e4 LT |
1931 | .enter_memory_pressure = tcp_enter_memory_pressure, |
1932 | .sockets_allocated = &tcp_sockets_allocated, | |
1933 | .memory_allocated = &tcp_memory_allocated, | |
1934 | .memory_pressure = &tcp_memory_pressure, | |
0a5578cf | 1935 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
1936 | .sysctl_wmem = sysctl_tcp_wmem, |
1937 | .sysctl_rmem = sysctl_tcp_rmem, | |
1938 | .max_header = MAX_TCP_HEADER, | |
1939 | .obj_size = sizeof(struct tcp6_sock), | |
3ab5aee7 | 1940 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 1941 | .twsk_prot = &tcp6_timewait_sock_ops, |
60236fdd | 1942 | .rsk_prot = &tcp6_request_sock_ops, |
39d8cda7 | 1943 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 1944 | .no_autobind = true, |
543d9cfe ACM |
1945 | #ifdef CONFIG_COMPAT |
1946 | .compat_setsockopt = compat_tcp_setsockopt, | |
1947 | .compat_getsockopt = compat_tcp_getsockopt, | |
1948 | #endif | |
c255a458 | 1949 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
1950 | .proto_cgroup = tcp_proto_cgroup, |
1951 | #endif | |
f77d6021 | 1952 | .clear_sk = tcp_v6_clear_sk, |
1da177e4 LT |
1953 | }; |
1954 | ||
41135cc8 | 1955 | static const struct inet6_protocol tcpv6_protocol = { |
c7109986 | 1956 | .early_demux = tcp_v6_early_demux, |
1da177e4 LT |
1957 | .handler = tcp_v6_rcv, |
1958 | .err_handler = tcp_v6_err, | |
1959 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1960 | }; | |
1961 | ||
1da177e4 LT |
1962 | static struct inet_protosw tcpv6_protosw = { |
1963 | .type = SOCK_STREAM, | |
1964 | .protocol = IPPROTO_TCP, | |
1965 | .prot = &tcpv6_prot, | |
1966 | .ops = &inet6_stream_ops, | |
1da177e4 | 1967 | .no_check = 0, |
d83d8461 ACM |
1968 | .flags = INET_PROTOSW_PERMANENT | |
1969 | INET_PROTOSW_ICSK, | |
1da177e4 LT |
1970 | }; |
1971 | ||
2c8c1e72 | 1972 | static int __net_init tcpv6_net_init(struct net *net) |
93ec926b | 1973 | { |
5677242f DL |
1974 | return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
1975 | SOCK_RAW, IPPROTO_TCP, net); | |
93ec926b DL |
1976 | } |
1977 | ||
2c8c1e72 | 1978 | static void __net_exit tcpv6_net_exit(struct net *net) |
93ec926b | 1979 | { |
5677242f | 1980 | inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
b099ce26 EB |
1981 | } |
1982 | ||
2c8c1e72 | 1983 | static void __net_exit tcpv6_net_exit_batch(struct list_head *net_exit_list) |
b099ce26 EB |
1984 | { |
1985 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET6); | |
93ec926b DL |
1986 | } |
1987 | ||
1988 | static struct pernet_operations tcpv6_net_ops = { | |
b099ce26 EB |
1989 | .init = tcpv6_net_init, |
1990 | .exit = tcpv6_net_exit, | |
1991 | .exit_batch = tcpv6_net_exit_batch, | |
93ec926b DL |
1992 | }; |
1993 | ||
7f4e4868 | 1994 | int __init tcpv6_init(void) |
1da177e4 | 1995 | { |
7f4e4868 DL |
1996 | int ret; |
1997 | ||
3336288a VY |
1998 | ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
1999 | if (ret) | |
c6b641a4 | 2000 | goto out; |
3336288a | 2001 | |
1da177e4 | 2002 | /* register inet6 protocol */ |
7f4e4868 DL |
2003 | ret = inet6_register_protosw(&tcpv6_protosw); |
2004 | if (ret) | |
2005 | goto out_tcpv6_protocol; | |
2006 | ||
93ec926b | 2007 | ret = register_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2008 | if (ret) |
2009 | goto out_tcpv6_protosw; | |
2010 | out: | |
2011 | return ret; | |
ae0f7d5f | 2012 | |
7f4e4868 DL |
2013 | out_tcpv6_protosw: |
2014 | inet6_unregister_protosw(&tcpv6_protosw); | |
3336288a VY |
2015 | out_tcpv6_protocol: |
2016 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
7f4e4868 DL |
2017 | goto out; |
2018 | } | |
2019 | ||
09f7709f | 2020 | void tcpv6_exit(void) |
7f4e4868 | 2021 | { |
93ec926b | 2022 | unregister_pernet_subsys(&tcpv6_net_ops); |
7f4e4868 DL |
2023 | inet6_unregister_protosw(&tcpv6_protosw); |
2024 | inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); | |
1da177e4 | 2025 | } |