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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Implementation of the Transmission Control Protocol(TCP). | |
7 | * | |
1da177e4 LT |
8 | * IPv4 specific functions |
9 | * | |
10 | * | |
11 | * code split from: | |
12 | * linux/ipv4/tcp.c | |
13 | * linux/ipv4/tcp_input.c | |
14 | * linux/ipv4/tcp_output.c | |
15 | * | |
16 | * See tcp.c for author information | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
24 | /* | |
25 | * Changes: | |
26 | * David S. Miller : New socket lookup architecture. | |
27 | * This code is dedicated to John Dyson. | |
28 | * David S. Miller : Change semantics of established hash, | |
29 | * half is devoted to TIME_WAIT sockets | |
30 | * and the rest go in the other half. | |
31 | * Andi Kleen : Add support for syncookies and fixed | |
32 | * some bugs: ip options weren't passed to | |
33 | * the TCP layer, missed a check for an | |
34 | * ACK bit. | |
35 | * Andi Kleen : Implemented fast path mtu discovery. | |
36 | * Fixed many serious bugs in the | |
60236fdd | 37 | * request_sock handling and moved |
1da177e4 LT |
38 | * most of it into the af independent code. |
39 | * Added tail drop and some other bugfixes. | |
caa20d9a | 40 | * Added new listen semantics. |
1da177e4 LT |
41 | * Mike McLagan : Routing by source |
42 | * Juan Jose Ciarlante: ip_dynaddr bits | |
43 | * Andi Kleen: various fixes. | |
44 | * Vitaly E. Lavrov : Transparent proxy revived after year | |
45 | * coma. | |
46 | * Andi Kleen : Fix new listen. | |
47 | * Andi Kleen : Fix accept error reporting. | |
48 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
49 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
50 | * a single port at the same time. | |
51 | */ | |
52 | ||
afd46503 | 53 | #define pr_fmt(fmt) "TCP: " fmt |
1da177e4 | 54 | |
eb4dea58 | 55 | #include <linux/bottom_half.h> |
1da177e4 LT |
56 | #include <linux/types.h> |
57 | #include <linux/fcntl.h> | |
58 | #include <linux/module.h> | |
59 | #include <linux/random.h> | |
60 | #include <linux/cache.h> | |
61 | #include <linux/jhash.h> | |
62 | #include <linux/init.h> | |
63 | #include <linux/times.h> | |
5a0e3ad6 | 64 | #include <linux/slab.h> |
1da177e4 | 65 | |
457c4cbc | 66 | #include <net/net_namespace.h> |
1da177e4 | 67 | #include <net/icmp.h> |
304a1618 | 68 | #include <net/inet_hashtables.h> |
1da177e4 | 69 | #include <net/tcp.h> |
20380731 | 70 | #include <net/transp_v6.h> |
1da177e4 LT |
71 | #include <net/ipv6.h> |
72 | #include <net/inet_common.h> | |
6d6ee43e | 73 | #include <net/timewait_sock.h> |
1da177e4 | 74 | #include <net/xfrm.h> |
6e5714ea | 75 | #include <net/secure_seq.h> |
d1a4c0b3 | 76 | #include <net/tcp_memcontrol.h> |
076bb0c8 | 77 | #include <net/busy_poll.h> |
1da177e4 LT |
78 | |
79 | #include <linux/inet.h> | |
80 | #include <linux/ipv6.h> | |
81 | #include <linux/stddef.h> | |
82 | #include <linux/proc_fs.h> | |
83 | #include <linux/seq_file.h> | |
84 | ||
cfb6eeb4 YH |
85 | #include <linux/crypto.h> |
86 | #include <linux/scatterlist.h> | |
87 | ||
ab32ea5d BH |
88 | int sysctl_tcp_tw_reuse __read_mostly; |
89 | int sysctl_tcp_low_latency __read_mostly; | |
4bc2f18b | 90 | EXPORT_SYMBOL(sysctl_tcp_low_latency); |
1da177e4 | 91 | |
cfb6eeb4 | 92 | #ifdef CONFIG_TCP_MD5SIG |
a915da9b | 93 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
318cf7aa | 94 | __be32 daddr, __be32 saddr, const struct tcphdr *th); |
cfb6eeb4 YH |
95 | #endif |
96 | ||
5caea4ea | 97 | struct inet_hashinfo tcp_hashinfo; |
4bc2f18b | 98 | EXPORT_SYMBOL(tcp_hashinfo); |
1da177e4 | 99 | |
936b8bdb | 100 | static __u32 tcp_v4_init_sequence(const struct sk_buff *skb) |
1da177e4 | 101 | { |
eddc9ec5 ACM |
102 | return secure_tcp_sequence_number(ip_hdr(skb)->daddr, |
103 | ip_hdr(skb)->saddr, | |
aa8223c7 ACM |
104 | tcp_hdr(skb)->dest, |
105 | tcp_hdr(skb)->source); | |
1da177e4 LT |
106 | } |
107 | ||
6d6ee43e ACM |
108 | int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp) |
109 | { | |
110 | const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw); | |
111 | struct tcp_sock *tp = tcp_sk(sk); | |
112 | ||
113 | /* With PAWS, it is safe from the viewpoint | |
114 | of data integrity. Even without PAWS it is safe provided sequence | |
115 | spaces do not overlap i.e. at data rates <= 80Mbit/sec. | |
116 | ||
117 | Actually, the idea is close to VJ's one, only timestamp cache is | |
118 | held not per host, but per port pair and TW bucket is used as state | |
119 | holder. | |
120 | ||
121 | If TW bucket has been already destroyed we fall back to VJ's scheme | |
122 | and use initial timestamp retrieved from peer table. | |
123 | */ | |
124 | if (tcptw->tw_ts_recent_stamp && | |
125 | (twp == NULL || (sysctl_tcp_tw_reuse && | |
9d729f72 | 126 | get_seconds() - tcptw->tw_ts_recent_stamp > 1))) { |
6d6ee43e ACM |
127 | tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2; |
128 | if (tp->write_seq == 0) | |
129 | tp->write_seq = 1; | |
130 | tp->rx_opt.ts_recent = tcptw->tw_ts_recent; | |
131 | tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp; | |
132 | sock_hold(sktw); | |
133 | return 1; | |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
6d6ee43e ACM |
138 | EXPORT_SYMBOL_GPL(tcp_twsk_unique); |
139 | ||
1da177e4 LT |
140 | /* This will initiate an outgoing connection. */ |
141 | int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
142 | { | |
2d7192d6 | 143 | struct sockaddr_in *usin = (struct sockaddr_in *)uaddr; |
1da177e4 LT |
144 | struct inet_sock *inet = inet_sk(sk); |
145 | struct tcp_sock *tp = tcp_sk(sk); | |
dca8b089 | 146 | __be16 orig_sport, orig_dport; |
bada8adc | 147 | __be32 daddr, nexthop; |
da905bd1 | 148 | struct flowi4 *fl4; |
2d7192d6 | 149 | struct rtable *rt; |
1da177e4 | 150 | int err; |
f6d8bd05 | 151 | struct ip_options_rcu *inet_opt; |
1da177e4 LT |
152 | |
153 | if (addr_len < sizeof(struct sockaddr_in)) | |
154 | return -EINVAL; | |
155 | ||
156 | if (usin->sin_family != AF_INET) | |
157 | return -EAFNOSUPPORT; | |
158 | ||
159 | nexthop = daddr = usin->sin_addr.s_addr; | |
f6d8bd05 ED |
160 | inet_opt = rcu_dereference_protected(inet->inet_opt, |
161 | sock_owned_by_user(sk)); | |
162 | if (inet_opt && inet_opt->opt.srr) { | |
1da177e4 LT |
163 | if (!daddr) |
164 | return -EINVAL; | |
f6d8bd05 | 165 | nexthop = inet_opt->opt.faddr; |
1da177e4 LT |
166 | } |
167 | ||
dca8b089 DM |
168 | orig_sport = inet->inet_sport; |
169 | orig_dport = usin->sin_port; | |
da905bd1 DM |
170 | fl4 = &inet->cork.fl.u.ip4; |
171 | rt = ip_route_connect(fl4, nexthop, inet->inet_saddr, | |
b23dd4fe DM |
172 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if, |
173 | IPPROTO_TCP, | |
0e0d44ab | 174 | orig_sport, orig_dport, sk); |
b23dd4fe DM |
175 | if (IS_ERR(rt)) { |
176 | err = PTR_ERR(rt); | |
177 | if (err == -ENETUNREACH) | |
f1d8cba6 | 178 | IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES); |
b23dd4fe | 179 | return err; |
584bdf8c | 180 | } |
1da177e4 LT |
181 | |
182 | if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) { | |
183 | ip_rt_put(rt); | |
184 | return -ENETUNREACH; | |
185 | } | |
186 | ||
f6d8bd05 | 187 | if (!inet_opt || !inet_opt->opt.srr) |
da905bd1 | 188 | daddr = fl4->daddr; |
1da177e4 | 189 | |
c720c7e8 | 190 | if (!inet->inet_saddr) |
da905bd1 | 191 | inet->inet_saddr = fl4->saddr; |
c720c7e8 | 192 | inet->inet_rcv_saddr = inet->inet_saddr; |
1da177e4 | 193 | |
c720c7e8 | 194 | if (tp->rx_opt.ts_recent_stamp && inet->inet_daddr != daddr) { |
1da177e4 LT |
195 | /* Reset inherited state */ |
196 | tp->rx_opt.ts_recent = 0; | |
197 | tp->rx_opt.ts_recent_stamp = 0; | |
ee995283 PE |
198 | if (likely(!tp->repair)) |
199 | tp->write_seq = 0; | |
1da177e4 LT |
200 | } |
201 | ||
295ff7ed | 202 | if (tcp_death_row.sysctl_tw_recycle && |
81166dd6 DM |
203 | !tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) |
204 | tcp_fetch_timewait_stamp(sk, &rt->dst); | |
1da177e4 | 205 | |
c720c7e8 ED |
206 | inet->inet_dport = usin->sin_port; |
207 | inet->inet_daddr = daddr; | |
1da177e4 | 208 | |
b73c3d0e TH |
209 | inet_set_txhash(sk); |
210 | ||
d83d8461 | 211 | inet_csk(sk)->icsk_ext_hdr_len = 0; |
f6d8bd05 ED |
212 | if (inet_opt) |
213 | inet_csk(sk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
1da177e4 | 214 | |
bee7ca9e | 215 | tp->rx_opt.mss_clamp = TCP_MSS_DEFAULT; |
1da177e4 LT |
216 | |
217 | /* Socket identity is still unknown (sport may be zero). | |
218 | * However we set state to SYN-SENT and not releasing socket | |
219 | * lock select source port, enter ourselves into the hash tables and | |
220 | * complete initialization after this. | |
221 | */ | |
222 | tcp_set_state(sk, TCP_SYN_SENT); | |
a7f5e7f1 | 223 | err = inet_hash_connect(&tcp_death_row, sk); |
1da177e4 LT |
224 | if (err) |
225 | goto failure; | |
226 | ||
da905bd1 | 227 | rt = ip_route_newports(fl4, rt, orig_sport, orig_dport, |
b23dd4fe DM |
228 | inet->inet_sport, inet->inet_dport, sk); |
229 | if (IS_ERR(rt)) { | |
230 | err = PTR_ERR(rt); | |
231 | rt = NULL; | |
1da177e4 | 232 | goto failure; |
b23dd4fe | 233 | } |
1da177e4 | 234 | /* OK, now commit destination to socket. */ |
bcd76111 | 235 | sk->sk_gso_type = SKB_GSO_TCPV4; |
d8d1f30b | 236 | sk_setup_caps(sk, &rt->dst); |
1da177e4 | 237 | |
ee995283 | 238 | if (!tp->write_seq && likely(!tp->repair)) |
c720c7e8 ED |
239 | tp->write_seq = secure_tcp_sequence_number(inet->inet_saddr, |
240 | inet->inet_daddr, | |
241 | inet->inet_sport, | |
1da177e4 LT |
242 | usin->sin_port); |
243 | ||
c720c7e8 | 244 | inet->inet_id = tp->write_seq ^ jiffies; |
1da177e4 | 245 | |
2b916477 | 246 | err = tcp_connect(sk); |
ee995283 | 247 | |
1da177e4 LT |
248 | rt = NULL; |
249 | if (err) | |
250 | goto failure; | |
251 | ||
252 | return 0; | |
253 | ||
254 | failure: | |
7174259e ACM |
255 | /* |
256 | * This unhashes the socket and releases the local port, | |
257 | * if necessary. | |
258 | */ | |
1da177e4 LT |
259 | tcp_set_state(sk, TCP_CLOSE); |
260 | ip_rt_put(rt); | |
261 | sk->sk_route_caps = 0; | |
c720c7e8 | 262 | inet->inet_dport = 0; |
1da177e4 LT |
263 | return err; |
264 | } | |
4bc2f18b | 265 | EXPORT_SYMBOL(tcp_v4_connect); |
1da177e4 | 266 | |
1da177e4 | 267 | /* |
563d34d0 ED |
268 | * This routine reacts to ICMP_FRAG_NEEDED mtu indications as defined in RFC1191. |
269 | * It can be called through tcp_release_cb() if socket was owned by user | |
270 | * at the time tcp_v4_err() was called to handle ICMP message. | |
1da177e4 | 271 | */ |
4fab9071 | 272 | void tcp_v4_mtu_reduced(struct sock *sk) |
1da177e4 LT |
273 | { |
274 | struct dst_entry *dst; | |
275 | struct inet_sock *inet = inet_sk(sk); | |
563d34d0 | 276 | u32 mtu = tcp_sk(sk)->mtu_info; |
1da177e4 | 277 | |
80d0a69f DM |
278 | dst = inet_csk_update_pmtu(sk, mtu); |
279 | if (!dst) | |
1da177e4 LT |
280 | return; |
281 | ||
1da177e4 LT |
282 | /* Something is about to be wrong... Remember soft error |
283 | * for the case, if this connection will not able to recover. | |
284 | */ | |
285 | if (mtu < dst_mtu(dst) && ip_dont_fragment(sk, dst)) | |
286 | sk->sk_err_soft = EMSGSIZE; | |
287 | ||
288 | mtu = dst_mtu(dst); | |
289 | ||
290 | if (inet->pmtudisc != IP_PMTUDISC_DONT && | |
482fc609 | 291 | ip_sk_accept_pmtu(sk) && |
d83d8461 | 292 | inet_csk(sk)->icsk_pmtu_cookie > mtu) { |
1da177e4 LT |
293 | tcp_sync_mss(sk, mtu); |
294 | ||
295 | /* Resend the TCP packet because it's | |
296 | * clear that the old packet has been | |
297 | * dropped. This is the new "fast" path mtu | |
298 | * discovery. | |
299 | */ | |
300 | tcp_simple_retransmit(sk); | |
301 | } /* else let the usual retransmit timer handle it */ | |
302 | } | |
4fab9071 | 303 | EXPORT_SYMBOL(tcp_v4_mtu_reduced); |
1da177e4 | 304 | |
55be7a9c DM |
305 | static void do_redirect(struct sk_buff *skb, struct sock *sk) |
306 | { | |
307 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
308 | ||
1ed5c48f | 309 | if (dst) |
6700c270 | 310 | dst->ops->redirect(dst, sk, skb); |
55be7a9c DM |
311 | } |
312 | ||
1da177e4 LT |
313 | /* |
314 | * This routine is called by the ICMP module when it gets some | |
315 | * sort of error condition. If err < 0 then the socket should | |
316 | * be closed and the error returned to the user. If err > 0 | |
317 | * it's just the icmp type << 8 | icmp code. After adjustment | |
318 | * header points to the first 8 bytes of the tcp header. We need | |
319 | * to find the appropriate port. | |
320 | * | |
321 | * The locking strategy used here is very "optimistic". When | |
322 | * someone else accesses the socket the ICMP is just dropped | |
323 | * and for some paths there is no check at all. | |
324 | * A more general error queue to queue errors for later handling | |
325 | * is probably better. | |
326 | * | |
327 | */ | |
328 | ||
4d1a2d9e | 329 | void tcp_v4_err(struct sk_buff *icmp_skb, u32 info) |
1da177e4 | 330 | { |
b71d1d42 | 331 | const struct iphdr *iph = (const struct iphdr *)icmp_skb->data; |
4d1a2d9e | 332 | struct tcphdr *th = (struct tcphdr *)(icmp_skb->data + (iph->ihl << 2)); |
f1ecd5d9 | 333 | struct inet_connection_sock *icsk; |
1da177e4 LT |
334 | struct tcp_sock *tp; |
335 | struct inet_sock *inet; | |
4d1a2d9e DL |
336 | const int type = icmp_hdr(icmp_skb)->type; |
337 | const int code = icmp_hdr(icmp_skb)->code; | |
1da177e4 | 338 | struct sock *sk; |
f1ecd5d9 | 339 | struct sk_buff *skb; |
0a672f74 YC |
340 | struct request_sock *fastopen; |
341 | __u32 seq, snd_una; | |
f1ecd5d9 | 342 | __u32 remaining; |
1da177e4 | 343 | int err; |
4d1a2d9e | 344 | struct net *net = dev_net(icmp_skb->dev); |
1da177e4 | 345 | |
fd54d716 | 346 | sk = inet_lookup(net, &tcp_hashinfo, iph->daddr, th->dest, |
4d1a2d9e | 347 | iph->saddr, th->source, inet_iif(icmp_skb)); |
1da177e4 | 348 | if (!sk) { |
dcfc23ca | 349 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
1da177e4 LT |
350 | return; |
351 | } | |
352 | if (sk->sk_state == TCP_TIME_WAIT) { | |
9469c7b4 | 353 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
354 | return; |
355 | } | |
356 | ||
357 | bh_lock_sock(sk); | |
358 | /* If too many ICMPs get dropped on busy | |
359 | * servers this needs to be solved differently. | |
563d34d0 ED |
360 | * We do take care of PMTU discovery (RFC1191) special case : |
361 | * we can receive locally generated ICMP messages while socket is held. | |
1da177e4 | 362 | */ |
b74aa930 ED |
363 | if (sock_owned_by_user(sk)) { |
364 | if (!(type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)) | |
365 | NET_INC_STATS_BH(net, LINUX_MIB_LOCKDROPPEDICMPS); | |
366 | } | |
1da177e4 LT |
367 | if (sk->sk_state == TCP_CLOSE) |
368 | goto out; | |
369 | ||
97e3ecd1 | 370 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
371 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
372 | goto out; | |
373 | } | |
374 | ||
f1ecd5d9 | 375 | icsk = inet_csk(sk); |
1da177e4 LT |
376 | tp = tcp_sk(sk); |
377 | seq = ntohl(th->seq); | |
0a672f74 YC |
378 | /* XXX (TFO) - tp->snd_una should be ISN (tcp_create_openreq_child() */ |
379 | fastopen = tp->fastopen_rsk; | |
380 | snd_una = fastopen ? tcp_rsk(fastopen)->snt_isn : tp->snd_una; | |
1da177e4 | 381 | if (sk->sk_state != TCP_LISTEN && |
0a672f74 | 382 | !between(seq, snd_una, tp->snd_nxt)) { |
de0744af | 383 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
384 | goto out; |
385 | } | |
386 | ||
387 | switch (type) { | |
55be7a9c DM |
388 | case ICMP_REDIRECT: |
389 | do_redirect(icmp_skb, sk); | |
390 | goto out; | |
1da177e4 LT |
391 | case ICMP_SOURCE_QUENCH: |
392 | /* Just silently ignore these. */ | |
393 | goto out; | |
394 | case ICMP_PARAMETERPROB: | |
395 | err = EPROTO; | |
396 | break; | |
397 | case ICMP_DEST_UNREACH: | |
398 | if (code > NR_ICMP_UNREACH) | |
399 | goto out; | |
400 | ||
401 | if (code == ICMP_FRAG_NEEDED) { /* PMTU discovery (RFC1191) */ | |
0d4f0608 ED |
402 | /* We are not interested in TCP_LISTEN and open_requests |
403 | * (SYN-ACKs send out by Linux are always <576bytes so | |
404 | * they should go through unfragmented). | |
405 | */ | |
406 | if (sk->sk_state == TCP_LISTEN) | |
407 | goto out; | |
408 | ||
563d34d0 | 409 | tp->mtu_info = info; |
144d56e9 | 410 | if (!sock_owned_by_user(sk)) { |
563d34d0 | 411 | tcp_v4_mtu_reduced(sk); |
144d56e9 ED |
412 | } else { |
413 | if (!test_and_set_bit(TCP_MTU_REDUCED_DEFERRED, &tp->tsq_flags)) | |
414 | sock_hold(sk); | |
415 | } | |
1da177e4 LT |
416 | goto out; |
417 | } | |
418 | ||
419 | err = icmp_err_convert[code].errno; | |
f1ecd5d9 DL |
420 | /* check if icmp_skb allows revert of backoff |
421 | * (see draft-zimmermann-tcp-lcd) */ | |
422 | if (code != ICMP_NET_UNREACH && code != ICMP_HOST_UNREACH) | |
423 | break; | |
424 | if (seq != tp->snd_una || !icsk->icsk_retransmits || | |
0a672f74 | 425 | !icsk->icsk_backoff || fastopen) |
f1ecd5d9 DL |
426 | break; |
427 | ||
8f49c270 DM |
428 | if (sock_owned_by_user(sk)) |
429 | break; | |
430 | ||
f1ecd5d9 | 431 | icsk->icsk_backoff--; |
fcdd1cf4 ED |
432 | icsk->icsk_rto = tp->srtt_us ? __tcp_set_rto(tp) : |
433 | TCP_TIMEOUT_INIT; | |
434 | icsk->icsk_rto = inet_csk_rto_backoff(icsk, TCP_RTO_MAX); | |
f1ecd5d9 DL |
435 | |
436 | skb = tcp_write_queue_head(sk); | |
437 | BUG_ON(!skb); | |
438 | ||
7faee5c0 ED |
439 | remaining = icsk->icsk_rto - |
440 | min(icsk->icsk_rto, | |
441 | tcp_time_stamp - tcp_skb_timestamp(skb)); | |
f1ecd5d9 DL |
442 | |
443 | if (remaining) { | |
444 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, | |
445 | remaining, TCP_RTO_MAX); | |
f1ecd5d9 DL |
446 | } else { |
447 | /* RTO revert clocked out retransmission. | |
448 | * Will retransmit now */ | |
449 | tcp_retransmit_timer(sk); | |
450 | } | |
451 | ||
1da177e4 LT |
452 | break; |
453 | case ICMP_TIME_EXCEEDED: | |
454 | err = EHOSTUNREACH; | |
455 | break; | |
456 | default: | |
457 | goto out; | |
458 | } | |
459 | ||
460 | switch (sk->sk_state) { | |
60236fdd | 461 | struct request_sock *req, **prev; |
1da177e4 LT |
462 | case TCP_LISTEN: |
463 | if (sock_owned_by_user(sk)) | |
464 | goto out; | |
465 | ||
463c84b9 ACM |
466 | req = inet_csk_search_req(sk, &prev, th->dest, |
467 | iph->daddr, iph->saddr); | |
1da177e4 LT |
468 | if (!req) |
469 | goto out; | |
470 | ||
471 | /* ICMPs are not backlogged, hence we cannot get | |
472 | an established socket here. | |
473 | */ | |
547b792c | 474 | WARN_ON(req->sk); |
1da177e4 | 475 | |
2e6599cb | 476 | if (seq != tcp_rsk(req)->snt_isn) { |
de0744af | 477 | NET_INC_STATS_BH(net, LINUX_MIB_OUTOFWINDOWICMPS); |
1da177e4 LT |
478 | goto out; |
479 | } | |
480 | ||
481 | /* | |
482 | * Still in SYN_RECV, just remove it silently. | |
483 | * There is no good way to pass the error to the newly | |
484 | * created socket, and POSIX does not want network | |
485 | * errors returned from accept(). | |
486 | */ | |
463c84b9 | 487 | inet_csk_reqsk_queue_drop(sk, req, prev); |
848bf15f | 488 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
489 | goto out; |
490 | ||
491 | case TCP_SYN_SENT: | |
0a672f74 YC |
492 | case TCP_SYN_RECV: |
493 | /* Only in fast or simultaneous open. If a fast open socket is | |
494 | * is already accepted it is treated as a connected one below. | |
495 | */ | |
496 | if (fastopen && fastopen->sk == NULL) | |
497 | break; | |
498 | ||
1da177e4 | 499 | if (!sock_owned_by_user(sk)) { |
1da177e4 LT |
500 | sk->sk_err = err; |
501 | ||
502 | sk->sk_error_report(sk); | |
503 | ||
504 | tcp_done(sk); | |
505 | } else { | |
506 | sk->sk_err_soft = err; | |
507 | } | |
508 | goto out; | |
509 | } | |
510 | ||
511 | /* If we've already connected we will keep trying | |
512 | * until we time out, or the user gives up. | |
513 | * | |
514 | * rfc1122 4.2.3.9 allows to consider as hard errors | |
515 | * only PROTO_UNREACH and PORT_UNREACH (well, FRAG_FAILED too, | |
516 | * but it is obsoleted by pmtu discovery). | |
517 | * | |
518 | * Note, that in modern internet, where routing is unreliable | |
519 | * and in each dark corner broken firewalls sit, sending random | |
520 | * errors ordered by their masters even this two messages finally lose | |
521 | * their original sense (even Linux sends invalid PORT_UNREACHs) | |
522 | * | |
523 | * Now we are in compliance with RFCs. | |
524 | * --ANK (980905) | |
525 | */ | |
526 | ||
527 | inet = inet_sk(sk); | |
528 | if (!sock_owned_by_user(sk) && inet->recverr) { | |
529 | sk->sk_err = err; | |
530 | sk->sk_error_report(sk); | |
531 | } else { /* Only an error on timeout */ | |
532 | sk->sk_err_soft = err; | |
533 | } | |
534 | ||
535 | out: | |
536 | bh_unlock_sock(sk); | |
537 | sock_put(sk); | |
538 | } | |
539 | ||
28850dc7 | 540 | void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr) |
1da177e4 | 541 | { |
aa8223c7 | 542 | struct tcphdr *th = tcp_hdr(skb); |
1da177e4 | 543 | |
84fa7933 | 544 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
419f9f89 | 545 | th->check = ~tcp_v4_check(skb->len, saddr, daddr, 0); |
663ead3b | 546 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 547 | skb->csum_offset = offsetof(struct tcphdr, check); |
1da177e4 | 548 | } else { |
419f9f89 | 549 | th->check = tcp_v4_check(skb->len, saddr, daddr, |
07f0757a | 550 | csum_partial(th, |
1da177e4 LT |
551 | th->doff << 2, |
552 | skb->csum)); | |
553 | } | |
554 | } | |
555 | ||
419f9f89 | 556 | /* This routine computes an IPv4 TCP checksum. */ |
bb296246 | 557 | void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) |
419f9f89 | 558 | { |
cf533ea5 | 559 | const struct inet_sock *inet = inet_sk(sk); |
419f9f89 HX |
560 | |
561 | __tcp_v4_send_check(skb, inet->inet_saddr, inet->inet_daddr); | |
562 | } | |
4bc2f18b | 563 | EXPORT_SYMBOL(tcp_v4_send_check); |
419f9f89 | 564 | |
1da177e4 LT |
565 | /* |
566 | * This routine will send an RST to the other tcp. | |
567 | * | |
568 | * Someone asks: why I NEVER use socket parameters (TOS, TTL etc.) | |
569 | * for reset. | |
570 | * Answer: if a packet caused RST, it is not for a socket | |
571 | * existing in our system, if it is matched to a socket, | |
572 | * it is just duplicate segment or bug in other side's TCP. | |
573 | * So that we build reply only basing on parameters | |
574 | * arrived with segment. | |
575 | * Exception: precedence violation. We do not implement it in any case. | |
576 | */ | |
577 | ||
cfb6eeb4 | 578 | static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 579 | { |
cf533ea5 | 580 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
581 | struct { |
582 | struct tcphdr th; | |
583 | #ifdef CONFIG_TCP_MD5SIG | |
714e85be | 584 | __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)]; |
cfb6eeb4 YH |
585 | #endif |
586 | } rep; | |
1da177e4 | 587 | struct ip_reply_arg arg; |
cfb6eeb4 YH |
588 | #ifdef CONFIG_TCP_MD5SIG |
589 | struct tcp_md5sig_key *key; | |
658ddaaf SL |
590 | const __u8 *hash_location = NULL; |
591 | unsigned char newhash[16]; | |
592 | int genhash; | |
593 | struct sock *sk1 = NULL; | |
cfb6eeb4 | 594 | #endif |
a86b1e30 | 595 | struct net *net; |
1da177e4 LT |
596 | |
597 | /* Never send a reset in response to a reset. */ | |
598 | if (th->rst) | |
599 | return; | |
600 | ||
511c3f92 | 601 | if (skb_rtable(skb)->rt_type != RTN_LOCAL) |
1da177e4 LT |
602 | return; |
603 | ||
604 | /* Swap the send and the receive. */ | |
cfb6eeb4 YH |
605 | memset(&rep, 0, sizeof(rep)); |
606 | rep.th.dest = th->source; | |
607 | rep.th.source = th->dest; | |
608 | rep.th.doff = sizeof(struct tcphdr) / 4; | |
609 | rep.th.rst = 1; | |
1da177e4 LT |
610 | |
611 | if (th->ack) { | |
cfb6eeb4 | 612 | rep.th.seq = th->ack_seq; |
1da177e4 | 613 | } else { |
cfb6eeb4 YH |
614 | rep.th.ack = 1; |
615 | rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin + | |
616 | skb->len - (th->doff << 2)); | |
1da177e4 LT |
617 | } |
618 | ||
7174259e | 619 | memset(&arg, 0, sizeof(arg)); |
cfb6eeb4 YH |
620 | arg.iov[0].iov_base = (unsigned char *)&rep; |
621 | arg.iov[0].iov_len = sizeof(rep.th); | |
622 | ||
623 | #ifdef CONFIG_TCP_MD5SIG | |
658ddaaf SL |
624 | hash_location = tcp_parse_md5sig_option(th); |
625 | if (!sk && hash_location) { | |
626 | /* | |
627 | * active side is lost. Try to find listening socket through | |
628 | * source port, and then find md5 key through listening socket. | |
629 | * we are not loose security here: | |
630 | * Incoming packet is checked with md5 hash with finding key, | |
631 | * no RST generated if md5 hash doesn't match. | |
632 | */ | |
633 | sk1 = __inet_lookup_listener(dev_net(skb_dst(skb)->dev), | |
da5e3630 TH |
634 | &tcp_hashinfo, ip_hdr(skb)->saddr, |
635 | th->source, ip_hdr(skb)->daddr, | |
658ddaaf SL |
636 | ntohs(th->source), inet_iif(skb)); |
637 | /* don't send rst if it can't find key */ | |
638 | if (!sk1) | |
639 | return; | |
640 | rcu_read_lock(); | |
641 | key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *) | |
642 | &ip_hdr(skb)->saddr, AF_INET); | |
643 | if (!key) | |
644 | goto release_sk1; | |
645 | ||
646 | genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, NULL, skb); | |
647 | if (genhash || memcmp(hash_location, newhash, 16) != 0) | |
648 | goto release_sk1; | |
649 | } else { | |
650 | key = sk ? tcp_md5_do_lookup(sk, (union tcp_md5_addr *) | |
651 | &ip_hdr(skb)->saddr, | |
652 | AF_INET) : NULL; | |
653 | } | |
654 | ||
cfb6eeb4 YH |
655 | if (key) { |
656 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | | |
657 | (TCPOPT_NOP << 16) | | |
658 | (TCPOPT_MD5SIG << 8) | | |
659 | TCPOLEN_MD5SIG); | |
660 | /* Update length and the length the header thinks exists */ | |
661 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
662 | rep.th.doff = arg.iov[0].iov_len / 4; | |
663 | ||
49a72dfb | 664 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[1], |
78e645cb IJ |
665 | key, ip_hdr(skb)->saddr, |
666 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
667 | } |
668 | #endif | |
eddc9ec5 ACM |
669 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
670 | ip_hdr(skb)->saddr, /* XXX */ | |
52cd5750 | 671 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
1da177e4 | 672 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; |
88ef4a5a | 673 | arg.flags = (sk && inet_sk(sk)->transparent) ? IP_REPLY_ARG_NOSRCCHECK : 0; |
e2446eaa | 674 | /* When socket is gone, all binding information is lost. |
4c675258 AK |
675 | * routing might fail in this case. No choice here, if we choose to force |
676 | * input interface, we will misroute in case of asymmetric route. | |
e2446eaa | 677 | */ |
4c675258 AK |
678 | if (sk) |
679 | arg.bound_dev_if = sk->sk_bound_dev_if; | |
1da177e4 | 680 | |
adf30907 | 681 | net = dev_net(skb_dst(skb)->dev); |
66b13d99 | 682 | arg.tos = ip_hdr(skb)->tos; |
24a2d43d ED |
683 | ip_send_unicast_reply(net, skb, &TCP_SKB_CB(skb)->header.h4.opt, |
684 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
685 | &arg, arg.iov[0].iov_len); | |
1da177e4 | 686 | |
63231bdd PE |
687 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
688 | TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS); | |
658ddaaf SL |
689 | |
690 | #ifdef CONFIG_TCP_MD5SIG | |
691 | release_sk1: | |
692 | if (sk1) { | |
693 | rcu_read_unlock(); | |
694 | sock_put(sk1); | |
695 | } | |
696 | #endif | |
1da177e4 LT |
697 | } |
698 | ||
699 | /* The code following below sending ACKs in SYN-RECV and TIME-WAIT states | |
700 | outside socket context is ugly, certainly. What can I do? | |
701 | */ | |
702 | ||
9501f972 | 703 | static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack, |
ee684b6f | 704 | u32 win, u32 tsval, u32 tsecr, int oif, |
88ef4a5a | 705 | struct tcp_md5sig_key *key, |
66b13d99 | 706 | int reply_flags, u8 tos) |
1da177e4 | 707 | { |
cf533ea5 | 708 | const struct tcphdr *th = tcp_hdr(skb); |
1da177e4 LT |
709 | struct { |
710 | struct tcphdr th; | |
714e85be | 711 | __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2) |
cfb6eeb4 | 712 | #ifdef CONFIG_TCP_MD5SIG |
714e85be | 713 | + (TCPOLEN_MD5SIG_ALIGNED >> 2) |
cfb6eeb4 YH |
714 | #endif |
715 | ]; | |
1da177e4 LT |
716 | } rep; |
717 | struct ip_reply_arg arg; | |
adf30907 | 718 | struct net *net = dev_net(skb_dst(skb)->dev); |
1da177e4 LT |
719 | |
720 | memset(&rep.th, 0, sizeof(struct tcphdr)); | |
7174259e | 721 | memset(&arg, 0, sizeof(arg)); |
1da177e4 LT |
722 | |
723 | arg.iov[0].iov_base = (unsigned char *)&rep; | |
724 | arg.iov[0].iov_len = sizeof(rep.th); | |
ee684b6f | 725 | if (tsecr) { |
cfb6eeb4 YH |
726 | rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
727 | (TCPOPT_TIMESTAMP << 8) | | |
728 | TCPOLEN_TIMESTAMP); | |
ee684b6f AV |
729 | rep.opt[1] = htonl(tsval); |
730 | rep.opt[2] = htonl(tsecr); | |
cb48cfe8 | 731 | arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED; |
1da177e4 LT |
732 | } |
733 | ||
734 | /* Swap the send and the receive. */ | |
735 | rep.th.dest = th->source; | |
736 | rep.th.source = th->dest; | |
737 | rep.th.doff = arg.iov[0].iov_len / 4; | |
738 | rep.th.seq = htonl(seq); | |
739 | rep.th.ack_seq = htonl(ack); | |
740 | rep.th.ack = 1; | |
741 | rep.th.window = htons(win); | |
742 | ||
cfb6eeb4 | 743 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 744 | if (key) { |
ee684b6f | 745 | int offset = (tsecr) ? 3 : 0; |
cfb6eeb4 YH |
746 | |
747 | rep.opt[offset++] = htonl((TCPOPT_NOP << 24) | | |
748 | (TCPOPT_NOP << 16) | | |
749 | (TCPOPT_MD5SIG << 8) | | |
750 | TCPOLEN_MD5SIG); | |
751 | arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED; | |
752 | rep.th.doff = arg.iov[0].iov_len/4; | |
753 | ||
49a72dfb | 754 | tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset], |
90b7e112 AL |
755 | key, ip_hdr(skb)->saddr, |
756 | ip_hdr(skb)->daddr, &rep.th); | |
cfb6eeb4 YH |
757 | } |
758 | #endif | |
88ef4a5a | 759 | arg.flags = reply_flags; |
eddc9ec5 ACM |
760 | arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr, |
761 | ip_hdr(skb)->saddr, /* XXX */ | |
1da177e4 LT |
762 | arg.iov[0].iov_len, IPPROTO_TCP, 0); |
763 | arg.csumoffset = offsetof(struct tcphdr, check) / 2; | |
9501f972 YH |
764 | if (oif) |
765 | arg.bound_dev_if = oif; | |
66b13d99 | 766 | arg.tos = tos; |
24a2d43d ED |
767 | ip_send_unicast_reply(net, skb, &TCP_SKB_CB(skb)->header.h4.opt, |
768 | ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, | |
769 | &arg, arg.iov[0].iov_len); | |
1da177e4 | 770 | |
63231bdd | 771 | TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS); |
1da177e4 LT |
772 | } |
773 | ||
774 | static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb) | |
775 | { | |
8feaf0c0 | 776 | struct inet_timewait_sock *tw = inet_twsk(sk); |
cfb6eeb4 | 777 | struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
1da177e4 | 778 | |
9501f972 | 779 | tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
7174259e | 780 | tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
ee684b6f | 781 | tcp_time_stamp + tcptw->tw_ts_offset, |
9501f972 YH |
782 | tcptw->tw_ts_recent, |
783 | tw->tw_bound_dev_if, | |
88ef4a5a | 784 | tcp_twsk_md5_key(tcptw), |
66b13d99 ED |
785 | tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0, |
786 | tw->tw_tos | |
9501f972 | 787 | ); |
1da177e4 | 788 | |
8feaf0c0 | 789 | inet_twsk_put(tw); |
1da177e4 LT |
790 | } |
791 | ||
6edafaaf | 792 | static void tcp_v4_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
7174259e | 793 | struct request_sock *req) |
1da177e4 | 794 | { |
168a8f58 JC |
795 | /* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV |
796 | * sk->sk_state == TCP_SYN_RECV -> for Fast Open. | |
797 | */ | |
798 | tcp_v4_send_ack(skb, (sk->sk_state == TCP_LISTEN) ? | |
799 | tcp_rsk(req)->snt_isn + 1 : tcp_sk(sk)->snd_nxt, | |
800 | tcp_rsk(req)->rcv_nxt, req->rcv_wnd, | |
ee684b6f | 801 | tcp_time_stamp, |
9501f972 YH |
802 | req->ts_recent, |
803 | 0, | |
a915da9b ED |
804 | tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->daddr, |
805 | AF_INET), | |
66b13d99 ED |
806 | inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0, |
807 | ip_hdr(skb)->tos); | |
1da177e4 LT |
808 | } |
809 | ||
1da177e4 | 810 | /* |
9bf1d83e | 811 | * Send a SYN-ACK after having received a SYN. |
60236fdd | 812 | * This still operates on a request_sock only, not on a big |
1da177e4 LT |
813 | * socket. |
814 | */ | |
72659ecc | 815 | static int tcp_v4_send_synack(struct sock *sk, struct dst_entry *dst, |
d6274bd8 | 816 | struct flowi *fl, |
72659ecc | 817 | struct request_sock *req, |
843f4a55 YC |
818 | u16 queue_mapping, |
819 | struct tcp_fastopen_cookie *foc) | |
1da177e4 | 820 | { |
2e6599cb | 821 | const struct inet_request_sock *ireq = inet_rsk(req); |
6bd023f3 | 822 | struct flowi4 fl4; |
1da177e4 | 823 | int err = -1; |
d41db5af | 824 | struct sk_buff *skb; |
1da177e4 LT |
825 | |
826 | /* First, grab a route. */ | |
ba3f7f04 | 827 | if (!dst && (dst = inet_csk_route_req(sk, &fl4, req)) == NULL) |
fd80eb94 | 828 | return -1; |
1da177e4 | 829 | |
843f4a55 | 830 | skb = tcp_make_synack(sk, dst, req, foc); |
1da177e4 LT |
831 | |
832 | if (skb) { | |
634fb979 | 833 | __tcp_v4_send_check(skb, ireq->ir_loc_addr, ireq->ir_rmt_addr); |
1da177e4 | 834 | |
fff32699 | 835 | skb_set_queue_mapping(skb, queue_mapping); |
634fb979 ED |
836 | err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, |
837 | ireq->ir_rmt_addr, | |
2e6599cb | 838 | ireq->opt); |
b9df3cb8 | 839 | err = net_xmit_eval(err); |
1da177e4 LT |
840 | } |
841 | ||
1da177e4 LT |
842 | return err; |
843 | } | |
844 | ||
845 | /* | |
60236fdd | 846 | * IPv4 request_sock destructor. |
1da177e4 | 847 | */ |
60236fdd | 848 | static void tcp_v4_reqsk_destructor(struct request_sock *req) |
1da177e4 | 849 | { |
a51482bd | 850 | kfree(inet_rsk(req)->opt); |
1da177e4 LT |
851 | } |
852 | ||
946cedcc | 853 | /* |
a2a385d6 | 854 | * Return true if a syncookie should be sent |
946cedcc | 855 | */ |
a2a385d6 | 856 | bool tcp_syn_flood_action(struct sock *sk, |
946cedcc ED |
857 | const struct sk_buff *skb, |
858 | const char *proto) | |
1da177e4 | 859 | { |
946cedcc | 860 | const char *msg = "Dropping request"; |
a2a385d6 | 861 | bool want_cookie = false; |
946cedcc ED |
862 | struct listen_sock *lopt; |
863 | ||
2a1d4bd4 | 864 | #ifdef CONFIG_SYN_COOKIES |
946cedcc | 865 | if (sysctl_tcp_syncookies) { |
2a1d4bd4 | 866 | msg = "Sending cookies"; |
a2a385d6 | 867 | want_cookie = true; |
946cedcc ED |
868 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDOCOOKIES); |
869 | } else | |
80e40daa | 870 | #endif |
946cedcc ED |
871 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPREQQFULLDROP); |
872 | ||
873 | lopt = inet_csk(sk)->icsk_accept_queue.listen_opt; | |
5ad37d5d | 874 | if (!lopt->synflood_warned && sysctl_tcp_syncookies != 2) { |
946cedcc | 875 | lopt->synflood_warned = 1; |
afd46503 | 876 | pr_info("%s: Possible SYN flooding on port %d. %s. Check SNMP counters.\n", |
946cedcc ED |
877 | proto, ntohs(tcp_hdr(skb)->dest), msg); |
878 | } | |
879 | return want_cookie; | |
2a1d4bd4 | 880 | } |
946cedcc | 881 | EXPORT_SYMBOL(tcp_syn_flood_action); |
1da177e4 | 882 | |
cfb6eeb4 YH |
883 | #ifdef CONFIG_TCP_MD5SIG |
884 | /* | |
885 | * RFC2385 MD5 checksumming requires a mapping of | |
886 | * IP address->MD5 Key. | |
887 | * We need to maintain these in the sk structure. | |
888 | */ | |
889 | ||
890 | /* Find the Key structure for an address. */ | |
a915da9b ED |
891 | struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk, |
892 | const union tcp_md5_addr *addr, | |
893 | int family) | |
cfb6eeb4 YH |
894 | { |
895 | struct tcp_sock *tp = tcp_sk(sk); | |
a915da9b | 896 | struct tcp_md5sig_key *key; |
a915da9b | 897 | unsigned int size = sizeof(struct in_addr); |
a8afca03 | 898 | struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 899 | |
a8afca03 ED |
900 | /* caller either holds rcu_read_lock() or socket lock */ |
901 | md5sig = rcu_dereference_check(tp->md5sig_info, | |
b4fb05ea ED |
902 | sock_owned_by_user(sk) || |
903 | lockdep_is_held(&sk->sk_lock.slock)); | |
a8afca03 | 904 | if (!md5sig) |
cfb6eeb4 | 905 | return NULL; |
a915da9b ED |
906 | #if IS_ENABLED(CONFIG_IPV6) |
907 | if (family == AF_INET6) | |
908 | size = sizeof(struct in6_addr); | |
909 | #endif | |
b67bfe0d | 910 | hlist_for_each_entry_rcu(key, &md5sig->head, node) { |
a915da9b ED |
911 | if (key->family != family) |
912 | continue; | |
913 | if (!memcmp(&key->addr, addr, size)) | |
914 | return key; | |
cfb6eeb4 YH |
915 | } |
916 | return NULL; | |
917 | } | |
a915da9b | 918 | EXPORT_SYMBOL(tcp_md5_do_lookup); |
cfb6eeb4 YH |
919 | |
920 | struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk, | |
921 | struct sock *addr_sk) | |
922 | { | |
a915da9b ED |
923 | union tcp_md5_addr *addr; |
924 | ||
925 | addr = (union tcp_md5_addr *)&inet_sk(addr_sk)->inet_daddr; | |
926 | return tcp_md5_do_lookup(sk, addr, AF_INET); | |
cfb6eeb4 | 927 | } |
cfb6eeb4 YH |
928 | EXPORT_SYMBOL(tcp_v4_md5_lookup); |
929 | ||
f5b99bcd AB |
930 | static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk, |
931 | struct request_sock *req) | |
cfb6eeb4 | 932 | { |
a915da9b ED |
933 | union tcp_md5_addr *addr; |
934 | ||
634fb979 | 935 | addr = (union tcp_md5_addr *)&inet_rsk(req)->ir_rmt_addr; |
a915da9b | 936 | return tcp_md5_do_lookup(sk, addr, AF_INET); |
cfb6eeb4 YH |
937 | } |
938 | ||
939 | /* This can be called on a newly created socket, from other files */ | |
a915da9b ED |
940 | int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr, |
941 | int family, const u8 *newkey, u8 newkeylen, gfp_t gfp) | |
cfb6eeb4 YH |
942 | { |
943 | /* Add Key to the list */ | |
b0a713e9 | 944 | struct tcp_md5sig_key *key; |
cfb6eeb4 | 945 | struct tcp_sock *tp = tcp_sk(sk); |
a915da9b | 946 | struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 947 | |
c0353c7b | 948 | key = tcp_md5_do_lookup(sk, addr, family); |
cfb6eeb4 YH |
949 | if (key) { |
950 | /* Pre-existing entry - just update that one. */ | |
a915da9b | 951 | memcpy(key->key, newkey, newkeylen); |
b0a713e9 | 952 | key->keylen = newkeylen; |
a915da9b ED |
953 | return 0; |
954 | } | |
260fcbeb | 955 | |
a8afca03 ED |
956 | md5sig = rcu_dereference_protected(tp->md5sig_info, |
957 | sock_owned_by_user(sk)); | |
a915da9b ED |
958 | if (!md5sig) { |
959 | md5sig = kmalloc(sizeof(*md5sig), gfp); | |
960 | if (!md5sig) | |
cfb6eeb4 | 961 | return -ENOMEM; |
cfb6eeb4 | 962 | |
a915da9b ED |
963 | sk_nocaps_add(sk, NETIF_F_GSO_MASK); |
964 | INIT_HLIST_HEAD(&md5sig->head); | |
a8afca03 | 965 | rcu_assign_pointer(tp->md5sig_info, md5sig); |
a915da9b | 966 | } |
cfb6eeb4 | 967 | |
5f3d9cb2 | 968 | key = sock_kmalloc(sk, sizeof(*key), gfp); |
a915da9b ED |
969 | if (!key) |
970 | return -ENOMEM; | |
71cea17e | 971 | if (!tcp_alloc_md5sig_pool()) { |
5f3d9cb2 | 972 | sock_kfree_s(sk, key, sizeof(*key)); |
a915da9b | 973 | return -ENOMEM; |
cfb6eeb4 | 974 | } |
a915da9b ED |
975 | |
976 | memcpy(key->key, newkey, newkeylen); | |
977 | key->keylen = newkeylen; | |
978 | key->family = family; | |
979 | memcpy(&key->addr, addr, | |
980 | (family == AF_INET6) ? sizeof(struct in6_addr) : | |
981 | sizeof(struct in_addr)); | |
982 | hlist_add_head_rcu(&key->node, &md5sig->head); | |
cfb6eeb4 YH |
983 | return 0; |
984 | } | |
a915da9b | 985 | EXPORT_SYMBOL(tcp_md5_do_add); |
cfb6eeb4 | 986 | |
a915da9b | 987 | int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family) |
cfb6eeb4 | 988 | { |
a915da9b ED |
989 | struct tcp_md5sig_key *key; |
990 | ||
c0353c7b | 991 | key = tcp_md5_do_lookup(sk, addr, family); |
a915da9b ED |
992 | if (!key) |
993 | return -ENOENT; | |
994 | hlist_del_rcu(&key->node); | |
5f3d9cb2 | 995 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
a915da9b | 996 | kfree_rcu(key, rcu); |
a915da9b | 997 | return 0; |
cfb6eeb4 | 998 | } |
a915da9b | 999 | EXPORT_SYMBOL(tcp_md5_do_del); |
cfb6eeb4 | 1000 | |
e0683e70 | 1001 | static void tcp_clear_md5_list(struct sock *sk) |
cfb6eeb4 YH |
1002 | { |
1003 | struct tcp_sock *tp = tcp_sk(sk); | |
a915da9b | 1004 | struct tcp_md5sig_key *key; |
b67bfe0d | 1005 | struct hlist_node *n; |
a8afca03 | 1006 | struct tcp_md5sig_info *md5sig; |
cfb6eeb4 | 1007 | |
a8afca03 ED |
1008 | md5sig = rcu_dereference_protected(tp->md5sig_info, 1); |
1009 | ||
b67bfe0d | 1010 | hlist_for_each_entry_safe(key, n, &md5sig->head, node) { |
a915da9b | 1011 | hlist_del_rcu(&key->node); |
5f3d9cb2 | 1012 | atomic_sub(sizeof(*key), &sk->sk_omem_alloc); |
a915da9b | 1013 | kfree_rcu(key, rcu); |
cfb6eeb4 YH |
1014 | } |
1015 | } | |
1016 | ||
7174259e ACM |
1017 | static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval, |
1018 | int optlen) | |
cfb6eeb4 YH |
1019 | { |
1020 | struct tcp_md5sig cmd; | |
1021 | struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr; | |
cfb6eeb4 YH |
1022 | |
1023 | if (optlen < sizeof(cmd)) | |
1024 | return -EINVAL; | |
1025 | ||
7174259e | 1026 | if (copy_from_user(&cmd, optval, sizeof(cmd))) |
cfb6eeb4 YH |
1027 | return -EFAULT; |
1028 | ||
1029 | if (sin->sin_family != AF_INET) | |
1030 | return -EINVAL; | |
1031 | ||
64a124ed | 1032 | if (!cmd.tcpm_keylen) |
a915da9b ED |
1033 | return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
1034 | AF_INET); | |
cfb6eeb4 YH |
1035 | |
1036 | if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) | |
1037 | return -EINVAL; | |
1038 | ||
a915da9b ED |
1039 | return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr, |
1040 | AF_INET, cmd.tcpm_key, cmd.tcpm_keylen, | |
1041 | GFP_KERNEL); | |
cfb6eeb4 YH |
1042 | } |
1043 | ||
49a72dfb AL |
1044 | static int tcp_v4_md5_hash_pseudoheader(struct tcp_md5sig_pool *hp, |
1045 | __be32 daddr, __be32 saddr, int nbytes) | |
cfb6eeb4 | 1046 | { |
cfb6eeb4 | 1047 | struct tcp4_pseudohdr *bp; |
49a72dfb | 1048 | struct scatterlist sg; |
cfb6eeb4 YH |
1049 | |
1050 | bp = &hp->md5_blk.ip4; | |
cfb6eeb4 YH |
1051 | |
1052 | /* | |
49a72dfb | 1053 | * 1. the TCP pseudo-header (in the order: source IP address, |
cfb6eeb4 YH |
1054 | * destination IP address, zero-padded protocol number, and |
1055 | * segment length) | |
1056 | */ | |
1057 | bp->saddr = saddr; | |
1058 | bp->daddr = daddr; | |
1059 | bp->pad = 0; | |
076fb722 | 1060 | bp->protocol = IPPROTO_TCP; |
49a72dfb | 1061 | bp->len = cpu_to_be16(nbytes); |
c7da57a1 | 1062 | |
49a72dfb AL |
1063 | sg_init_one(&sg, bp, sizeof(*bp)); |
1064 | return crypto_hash_update(&hp->md5_desc, &sg, sizeof(*bp)); | |
1065 | } | |
1066 | ||
a915da9b | 1067 | static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key, |
318cf7aa | 1068 | __be32 daddr, __be32 saddr, const struct tcphdr *th) |
49a72dfb AL |
1069 | { |
1070 | struct tcp_md5sig_pool *hp; | |
1071 | struct hash_desc *desc; | |
1072 | ||
1073 | hp = tcp_get_md5sig_pool(); | |
1074 | if (!hp) | |
1075 | goto clear_hash_noput; | |
1076 | desc = &hp->md5_desc; | |
1077 | ||
1078 | if (crypto_hash_init(desc)) | |
1079 | goto clear_hash; | |
1080 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, th->doff << 2)) | |
1081 | goto clear_hash; | |
1082 | if (tcp_md5_hash_header(hp, th)) | |
1083 | goto clear_hash; | |
1084 | if (tcp_md5_hash_key(hp, key)) | |
1085 | goto clear_hash; | |
1086 | if (crypto_hash_final(desc, md5_hash)) | |
cfb6eeb4 YH |
1087 | goto clear_hash; |
1088 | ||
cfb6eeb4 | 1089 | tcp_put_md5sig_pool(); |
cfb6eeb4 | 1090 | return 0; |
49a72dfb | 1091 | |
cfb6eeb4 YH |
1092 | clear_hash: |
1093 | tcp_put_md5sig_pool(); | |
1094 | clear_hash_noput: | |
1095 | memset(md5_hash, 0, 16); | |
49a72dfb | 1096 | return 1; |
cfb6eeb4 YH |
1097 | } |
1098 | ||
49a72dfb | 1099 | int tcp_v4_md5_hash_skb(char *md5_hash, struct tcp_md5sig_key *key, |
318cf7aa ED |
1100 | const struct sock *sk, const struct request_sock *req, |
1101 | const struct sk_buff *skb) | |
cfb6eeb4 | 1102 | { |
49a72dfb AL |
1103 | struct tcp_md5sig_pool *hp; |
1104 | struct hash_desc *desc; | |
318cf7aa | 1105 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 YH |
1106 | __be32 saddr, daddr; |
1107 | ||
1108 | if (sk) { | |
c720c7e8 ED |
1109 | saddr = inet_sk(sk)->inet_saddr; |
1110 | daddr = inet_sk(sk)->inet_daddr; | |
49a72dfb | 1111 | } else if (req) { |
634fb979 ED |
1112 | saddr = inet_rsk(req)->ir_loc_addr; |
1113 | daddr = inet_rsk(req)->ir_rmt_addr; | |
cfb6eeb4 | 1114 | } else { |
49a72dfb AL |
1115 | const struct iphdr *iph = ip_hdr(skb); |
1116 | saddr = iph->saddr; | |
1117 | daddr = iph->daddr; | |
cfb6eeb4 | 1118 | } |
49a72dfb AL |
1119 | |
1120 | hp = tcp_get_md5sig_pool(); | |
1121 | if (!hp) | |
1122 | goto clear_hash_noput; | |
1123 | desc = &hp->md5_desc; | |
1124 | ||
1125 | if (crypto_hash_init(desc)) | |
1126 | goto clear_hash; | |
1127 | ||
1128 | if (tcp_v4_md5_hash_pseudoheader(hp, daddr, saddr, skb->len)) | |
1129 | goto clear_hash; | |
1130 | if (tcp_md5_hash_header(hp, th)) | |
1131 | goto clear_hash; | |
1132 | if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2)) | |
1133 | goto clear_hash; | |
1134 | if (tcp_md5_hash_key(hp, key)) | |
1135 | goto clear_hash; | |
1136 | if (crypto_hash_final(desc, md5_hash)) | |
1137 | goto clear_hash; | |
1138 | ||
1139 | tcp_put_md5sig_pool(); | |
1140 | return 0; | |
1141 | ||
1142 | clear_hash: | |
1143 | tcp_put_md5sig_pool(); | |
1144 | clear_hash_noput: | |
1145 | memset(md5_hash, 0, 16); | |
1146 | return 1; | |
cfb6eeb4 | 1147 | } |
49a72dfb | 1148 | EXPORT_SYMBOL(tcp_v4_md5_hash_skb); |
cfb6eeb4 | 1149 | |
9ea88a15 DP |
1150 | static bool __tcp_v4_inbound_md5_hash(struct sock *sk, |
1151 | const struct sk_buff *skb) | |
cfb6eeb4 YH |
1152 | { |
1153 | /* | |
1154 | * This gets called for each TCP segment that arrives | |
1155 | * so we want to be efficient. | |
1156 | * We have 3 drop cases: | |
1157 | * o No MD5 hash and one expected. | |
1158 | * o MD5 hash and we're not expecting one. | |
1159 | * o MD5 hash and its wrong. | |
1160 | */ | |
cf533ea5 | 1161 | const __u8 *hash_location = NULL; |
cfb6eeb4 | 1162 | struct tcp_md5sig_key *hash_expected; |
eddc9ec5 | 1163 | const struct iphdr *iph = ip_hdr(skb); |
cf533ea5 | 1164 | const struct tcphdr *th = tcp_hdr(skb); |
cfb6eeb4 | 1165 | int genhash; |
cfb6eeb4 YH |
1166 | unsigned char newhash[16]; |
1167 | ||
a915da9b ED |
1168 | hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr, |
1169 | AF_INET); | |
7d5d5525 | 1170 | hash_location = tcp_parse_md5sig_option(th); |
cfb6eeb4 | 1171 | |
cfb6eeb4 YH |
1172 | /* We've parsed the options - do we have a hash? */ |
1173 | if (!hash_expected && !hash_location) | |
a2a385d6 | 1174 | return false; |
cfb6eeb4 YH |
1175 | |
1176 | if (hash_expected && !hash_location) { | |
785957d3 | 1177 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND); |
a2a385d6 | 1178 | return true; |
cfb6eeb4 YH |
1179 | } |
1180 | ||
1181 | if (!hash_expected && hash_location) { | |
785957d3 | 1182 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED); |
a2a385d6 | 1183 | return true; |
cfb6eeb4 YH |
1184 | } |
1185 | ||
1186 | /* Okay, so this is hash_expected and hash_location - | |
1187 | * so we need to calculate the checksum. | |
1188 | */ | |
49a72dfb AL |
1189 | genhash = tcp_v4_md5_hash_skb(newhash, |
1190 | hash_expected, | |
1191 | NULL, NULL, skb); | |
cfb6eeb4 YH |
1192 | |
1193 | if (genhash || memcmp(hash_location, newhash, 16) != 0) { | |
e87cc472 JP |
1194 | net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n", |
1195 | &iph->saddr, ntohs(th->source), | |
1196 | &iph->daddr, ntohs(th->dest), | |
1197 | genhash ? " tcp_v4_calc_md5_hash failed" | |
1198 | : ""); | |
a2a385d6 | 1199 | return true; |
cfb6eeb4 | 1200 | } |
a2a385d6 | 1201 | return false; |
cfb6eeb4 YH |
1202 | } |
1203 | ||
9ea88a15 DP |
1204 | static bool tcp_v4_inbound_md5_hash(struct sock *sk, const struct sk_buff *skb) |
1205 | { | |
1206 | bool ret; | |
1207 | ||
1208 | rcu_read_lock(); | |
1209 | ret = __tcp_v4_inbound_md5_hash(sk, skb); | |
1210 | rcu_read_unlock(); | |
1211 | ||
1212 | return ret; | |
1213 | } | |
1214 | ||
cfb6eeb4 YH |
1215 | #endif |
1216 | ||
16bea70a OP |
1217 | static void tcp_v4_init_req(struct request_sock *req, struct sock *sk, |
1218 | struct sk_buff *skb) | |
1219 | { | |
1220 | struct inet_request_sock *ireq = inet_rsk(req); | |
1221 | ||
1222 | ireq->ir_loc_addr = ip_hdr(skb)->daddr; | |
1223 | ireq->ir_rmt_addr = ip_hdr(skb)->saddr; | |
1224 | ireq->no_srccheck = inet_sk(sk)->transparent; | |
1225 | ireq->opt = tcp_v4_save_options(skb); | |
1226 | } | |
1227 | ||
d94e0417 OP |
1228 | static struct dst_entry *tcp_v4_route_req(struct sock *sk, struct flowi *fl, |
1229 | const struct request_sock *req, | |
1230 | bool *strict) | |
1231 | { | |
1232 | struct dst_entry *dst = inet_csk_route_req(sk, &fl->u.ip4, req); | |
1233 | ||
1234 | if (strict) { | |
1235 | if (fl->u.ip4.daddr == inet_rsk(req)->ir_rmt_addr) | |
1236 | *strict = true; | |
1237 | else | |
1238 | *strict = false; | |
1239 | } | |
1240 | ||
1241 | return dst; | |
1242 | } | |
1243 | ||
72a3effa | 1244 | struct request_sock_ops tcp_request_sock_ops __read_mostly = { |
1da177e4 | 1245 | .family = PF_INET, |
2e6599cb | 1246 | .obj_size = sizeof(struct tcp_request_sock), |
5db92c99 | 1247 | .rtx_syn_ack = tcp_rtx_synack, |
60236fdd ACM |
1248 | .send_ack = tcp_v4_reqsk_send_ack, |
1249 | .destructor = tcp_v4_reqsk_destructor, | |
1da177e4 | 1250 | .send_reset = tcp_v4_send_reset, |
688d1945 | 1251 | .syn_ack_timeout = tcp_syn_ack_timeout, |
1da177e4 LT |
1252 | }; |
1253 | ||
b2e4b3de | 1254 | static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = { |
2aec4a29 | 1255 | .mss_clamp = TCP_MSS_DEFAULT, |
16bea70a | 1256 | #ifdef CONFIG_TCP_MD5SIG |
cfb6eeb4 | 1257 | .md5_lookup = tcp_v4_reqsk_md5_lookup, |
e3afe7b7 | 1258 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
b6332e6c | 1259 | #endif |
16bea70a | 1260 | .init_req = tcp_v4_init_req, |
fb7b37a7 OP |
1261 | #ifdef CONFIG_SYN_COOKIES |
1262 | .cookie_init_seq = cookie_v4_init_sequence, | |
1263 | #endif | |
d94e0417 | 1264 | .route_req = tcp_v4_route_req, |
936b8bdb | 1265 | .init_seq = tcp_v4_init_sequence, |
d6274bd8 | 1266 | .send_synack = tcp_v4_send_synack, |
695da14e | 1267 | .queue_hash_add = inet_csk_reqsk_queue_hash_add, |
16bea70a | 1268 | }; |
cfb6eeb4 | 1269 | |
1da177e4 LT |
1270 | int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb) |
1271 | { | |
1da177e4 | 1272 | /* Never answer to SYNs send to broadcast or multicast */ |
511c3f92 | 1273 | if (skb_rtable(skb)->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) |
1da177e4 LT |
1274 | goto drop; |
1275 | ||
1fb6f159 OP |
1276 | return tcp_conn_request(&tcp_request_sock_ops, |
1277 | &tcp_request_sock_ipv4_ops, sk, skb); | |
1da177e4 | 1278 | |
1da177e4 | 1279 | drop: |
848bf15f | 1280 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 LT |
1281 | return 0; |
1282 | } | |
4bc2f18b | 1283 | EXPORT_SYMBOL(tcp_v4_conn_request); |
1da177e4 LT |
1284 | |
1285 | ||
1286 | /* | |
1287 | * The three way handshake has completed - we got a valid synack - | |
1288 | * now create the new socket. | |
1289 | */ | |
1290 | struct sock *tcp_v4_syn_recv_sock(struct sock *sk, struct sk_buff *skb, | |
60236fdd | 1291 | struct request_sock *req, |
1da177e4 LT |
1292 | struct dst_entry *dst) |
1293 | { | |
2e6599cb | 1294 | struct inet_request_sock *ireq; |
1da177e4 LT |
1295 | struct inet_sock *newinet; |
1296 | struct tcp_sock *newtp; | |
1297 | struct sock *newsk; | |
cfb6eeb4 YH |
1298 | #ifdef CONFIG_TCP_MD5SIG |
1299 | struct tcp_md5sig_key *key; | |
1300 | #endif | |
f6d8bd05 | 1301 | struct ip_options_rcu *inet_opt; |
1da177e4 LT |
1302 | |
1303 | if (sk_acceptq_is_full(sk)) | |
1304 | goto exit_overflow; | |
1305 | ||
1da177e4 LT |
1306 | newsk = tcp_create_openreq_child(sk, req, skb); |
1307 | if (!newsk) | |
093d2823 | 1308 | goto exit_nonewsk; |
1da177e4 | 1309 | |
bcd76111 | 1310 | newsk->sk_gso_type = SKB_GSO_TCPV4; |
fae6ef87 | 1311 | inet_sk_rx_dst_set(newsk, skb); |
1da177e4 LT |
1312 | |
1313 | newtp = tcp_sk(newsk); | |
1314 | newinet = inet_sk(newsk); | |
2e6599cb | 1315 | ireq = inet_rsk(req); |
634fb979 ED |
1316 | newinet->inet_daddr = ireq->ir_rmt_addr; |
1317 | newinet->inet_rcv_saddr = ireq->ir_loc_addr; | |
1318 | newinet->inet_saddr = ireq->ir_loc_addr; | |
f6d8bd05 ED |
1319 | inet_opt = ireq->opt; |
1320 | rcu_assign_pointer(newinet->inet_opt, inet_opt); | |
2e6599cb | 1321 | ireq->opt = NULL; |
463c84b9 | 1322 | newinet->mc_index = inet_iif(skb); |
eddc9ec5 | 1323 | newinet->mc_ttl = ip_hdr(skb)->ttl; |
4c507d28 | 1324 | newinet->rcv_tos = ip_hdr(skb)->tos; |
d83d8461 | 1325 | inet_csk(newsk)->icsk_ext_hdr_len = 0; |
b73c3d0e | 1326 | inet_set_txhash(newsk); |
f6d8bd05 ED |
1327 | if (inet_opt) |
1328 | inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen; | |
c720c7e8 | 1329 | newinet->inet_id = newtp->write_seq ^ jiffies; |
1da177e4 | 1330 | |
dfd25fff ED |
1331 | if (!dst) { |
1332 | dst = inet_csk_route_child_sock(sk, newsk, req); | |
1333 | if (!dst) | |
1334 | goto put_and_exit; | |
1335 | } else { | |
1336 | /* syncookie case : see end of cookie_v4_check() */ | |
1337 | } | |
0e734419 DM |
1338 | sk_setup_caps(newsk, dst); |
1339 | ||
1da177e4 | 1340 | tcp_sync_mss(newsk, dst_mtu(dst)); |
0dbaee3b | 1341 | newtp->advmss = dst_metric_advmss(dst); |
f5fff5dc TQ |
1342 | if (tcp_sk(sk)->rx_opt.user_mss && |
1343 | tcp_sk(sk)->rx_opt.user_mss < newtp->advmss) | |
1344 | newtp->advmss = tcp_sk(sk)->rx_opt.user_mss; | |
1345 | ||
1da177e4 LT |
1346 | tcp_initialize_rcv_mss(newsk); |
1347 | ||
cfb6eeb4 YH |
1348 | #ifdef CONFIG_TCP_MD5SIG |
1349 | /* Copy over the MD5 key from the original socket */ | |
a915da9b ED |
1350 | key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr, |
1351 | AF_INET); | |
c720c7e8 | 1352 | if (key != NULL) { |
cfb6eeb4 YH |
1353 | /* |
1354 | * We're using one, so create a matching key | |
1355 | * on the newsk structure. If we fail to get | |
1356 | * memory, then we end up not copying the key | |
1357 | * across. Shucks. | |
1358 | */ | |
a915da9b ED |
1359 | tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newinet->inet_daddr, |
1360 | AF_INET, key->key, key->keylen, GFP_ATOMIC); | |
a465419b | 1361 | sk_nocaps_add(newsk, NETIF_F_GSO_MASK); |
cfb6eeb4 YH |
1362 | } |
1363 | #endif | |
1364 | ||
0e734419 DM |
1365 | if (__inet_inherit_port(sk, newsk) < 0) |
1366 | goto put_and_exit; | |
9327f705 | 1367 | __inet_hash_nolisten(newsk, NULL); |
1da177e4 LT |
1368 | |
1369 | return newsk; | |
1370 | ||
1371 | exit_overflow: | |
de0744af | 1372 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
093d2823 BS |
1373 | exit_nonewsk: |
1374 | dst_release(dst); | |
1da177e4 | 1375 | exit: |
de0744af | 1376 | NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS); |
1da177e4 | 1377 | return NULL; |
0e734419 | 1378 | put_and_exit: |
e337e24d CP |
1379 | inet_csk_prepare_forced_close(newsk); |
1380 | tcp_done(newsk); | |
0e734419 | 1381 | goto exit; |
1da177e4 | 1382 | } |
4bc2f18b | 1383 | EXPORT_SYMBOL(tcp_v4_syn_recv_sock); |
1da177e4 LT |
1384 | |
1385 | static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) | |
1386 | { | |
aa8223c7 | 1387 | struct tcphdr *th = tcp_hdr(skb); |
eddc9ec5 | 1388 | const struct iphdr *iph = ip_hdr(skb); |
1da177e4 | 1389 | struct sock *nsk; |
60236fdd | 1390 | struct request_sock **prev; |
1da177e4 | 1391 | /* Find possible connection requests. */ |
463c84b9 ACM |
1392 | struct request_sock *req = inet_csk_search_req(sk, &prev, th->source, |
1393 | iph->saddr, iph->daddr); | |
1da177e4 | 1394 | if (req) |
8336886f | 1395 | return tcp_check_req(sk, skb, req, prev, false); |
1da177e4 | 1396 | |
3b1e0a65 | 1397 | nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr, |
c67499c0 | 1398 | th->source, iph->daddr, th->dest, inet_iif(skb)); |
1da177e4 LT |
1399 | |
1400 | if (nsk) { | |
1401 | if (nsk->sk_state != TCP_TIME_WAIT) { | |
1402 | bh_lock_sock(nsk); | |
1403 | return nsk; | |
1404 | } | |
9469c7b4 | 1405 | inet_twsk_put(inet_twsk(nsk)); |
1da177e4 LT |
1406 | return NULL; |
1407 | } | |
1408 | ||
1409 | #ifdef CONFIG_SYN_COOKIES | |
af9b4738 | 1410 | if (!th->syn) |
971f10ec | 1411 | sk = cookie_v4_check(sk, skb, &TCP_SKB_CB(skb)->header.h4.opt); |
1da177e4 LT |
1412 | #endif |
1413 | return sk; | |
1414 | } | |
1415 | ||
1da177e4 LT |
1416 | /* The socket must have it's spinlock held when we get |
1417 | * here. | |
1418 | * | |
1419 | * We have a potential double-lock case here, so even when | |
1420 | * doing backlog processing we use the BH locking scheme. | |
1421 | * This is because we cannot sleep with the original spinlock | |
1422 | * held. | |
1423 | */ | |
1424 | int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) | |
1425 | { | |
cfb6eeb4 | 1426 | struct sock *rsk; |
cfb6eeb4 | 1427 | |
1da177e4 | 1428 | if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
404e0a8b ED |
1429 | struct dst_entry *dst = sk->sk_rx_dst; |
1430 | ||
bdeab991 | 1431 | sock_rps_save_rxhash(sk, skb); |
404e0a8b | 1432 | if (dst) { |
505fbcf0 ED |
1433 | if (inet_sk(sk)->rx_dst_ifindex != skb->skb_iif || |
1434 | dst->ops->check(dst, 0) == NULL) { | |
92101b3b DM |
1435 | dst_release(dst); |
1436 | sk->sk_rx_dst = NULL; | |
1437 | } | |
1438 | } | |
c995ae22 | 1439 | tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len); |
1da177e4 LT |
1440 | return 0; |
1441 | } | |
1442 | ||
ab6a5bb6 | 1443 | if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
1da177e4 LT |
1444 | goto csum_err; |
1445 | ||
1446 | if (sk->sk_state == TCP_LISTEN) { | |
1447 | struct sock *nsk = tcp_v4_hnd_req(sk, skb); | |
1448 | if (!nsk) | |
1449 | goto discard; | |
1450 | ||
1451 | if (nsk != sk) { | |
bdeab991 | 1452 | sock_rps_save_rxhash(nsk, skb); |
cfb6eeb4 YH |
1453 | if (tcp_child_process(sk, nsk, skb)) { |
1454 | rsk = nsk; | |
1da177e4 | 1455 | goto reset; |
cfb6eeb4 | 1456 | } |
1da177e4 LT |
1457 | return 0; |
1458 | } | |
ca55158c | 1459 | } else |
bdeab991 | 1460 | sock_rps_save_rxhash(sk, skb); |
ca55158c | 1461 | |
aa8223c7 | 1462 | if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) { |
cfb6eeb4 | 1463 | rsk = sk; |
1da177e4 | 1464 | goto reset; |
cfb6eeb4 | 1465 | } |
1da177e4 LT |
1466 | return 0; |
1467 | ||
1468 | reset: | |
cfb6eeb4 | 1469 | tcp_v4_send_reset(rsk, skb); |
1da177e4 LT |
1470 | discard: |
1471 | kfree_skb(skb); | |
1472 | /* Be careful here. If this function gets more complicated and | |
1473 | * gcc suffers from register pressure on the x86, sk (in %ebx) | |
1474 | * might be destroyed here. This current version compiles correctly, | |
1475 | * but you have been warned. | |
1476 | */ | |
1477 | return 0; | |
1478 | ||
1479 | csum_err: | |
6a5dc9e5 | 1480 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_CSUMERRORS); |
63231bdd | 1481 | TCP_INC_STATS_BH(sock_net(sk), TCP_MIB_INERRS); |
1da177e4 LT |
1482 | goto discard; |
1483 | } | |
4bc2f18b | 1484 | EXPORT_SYMBOL(tcp_v4_do_rcv); |
1da177e4 | 1485 | |
160eb5a6 | 1486 | void tcp_v4_early_demux(struct sk_buff *skb) |
41063e9d | 1487 | { |
41063e9d DM |
1488 | const struct iphdr *iph; |
1489 | const struct tcphdr *th; | |
1490 | struct sock *sk; | |
41063e9d | 1491 | |
41063e9d | 1492 | if (skb->pkt_type != PACKET_HOST) |
160eb5a6 | 1493 | return; |
41063e9d | 1494 | |
45f00f99 | 1495 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct tcphdr))) |
160eb5a6 | 1496 | return; |
41063e9d DM |
1497 | |
1498 | iph = ip_hdr(skb); | |
45f00f99 | 1499 | th = tcp_hdr(skb); |
41063e9d DM |
1500 | |
1501 | if (th->doff < sizeof(struct tcphdr) / 4) | |
160eb5a6 | 1502 | return; |
41063e9d | 1503 | |
45f00f99 | 1504 | sk = __inet_lookup_established(dev_net(skb->dev), &tcp_hashinfo, |
41063e9d | 1505 | iph->saddr, th->source, |
7011d085 | 1506 | iph->daddr, ntohs(th->dest), |
9cb429d6 | 1507 | skb->skb_iif); |
41063e9d DM |
1508 | if (sk) { |
1509 | skb->sk = sk; | |
1510 | skb->destructor = sock_edemux; | |
1511 | if (sk->sk_state != TCP_TIME_WAIT) { | |
1512 | struct dst_entry *dst = sk->sk_rx_dst; | |
505fbcf0 | 1513 | |
41063e9d DM |
1514 | if (dst) |
1515 | dst = dst_check(dst, 0); | |
92101b3b | 1516 | if (dst && |
505fbcf0 | 1517 | inet_sk(sk)->rx_dst_ifindex == skb->skb_iif) |
92101b3b | 1518 | skb_dst_set_noref(skb, dst); |
41063e9d DM |
1519 | } |
1520 | } | |
41063e9d DM |
1521 | } |
1522 | ||
b2fb4f54 ED |
1523 | /* Packet is added to VJ-style prequeue for processing in process |
1524 | * context, if a reader task is waiting. Apparently, this exciting | |
1525 | * idea (VJ's mail "Re: query about TCP header on tcp-ip" of 07 Sep 93) | |
1526 | * failed somewhere. Latency? Burstiness? Well, at least now we will | |
1527 | * see, why it failed. 8)8) --ANK | |
1528 | * | |
1529 | */ | |
1530 | bool tcp_prequeue(struct sock *sk, struct sk_buff *skb) | |
1531 | { | |
1532 | struct tcp_sock *tp = tcp_sk(sk); | |
1533 | ||
1534 | if (sysctl_tcp_low_latency || !tp->ucopy.task) | |
1535 | return false; | |
1536 | ||
1537 | if (skb->len <= tcp_hdrlen(skb) && | |
1538 | skb_queue_len(&tp->ucopy.prequeue) == 0) | |
1539 | return false; | |
1540 | ||
ca777eff ED |
1541 | /* Before escaping RCU protected region, we need to take care of skb |
1542 | * dst. Prequeue is only enabled for established sockets. | |
1543 | * For such sockets, we might need the skb dst only to set sk->sk_rx_dst | |
1544 | * Instead of doing full sk_rx_dst validity here, let's perform | |
1545 | * an optimistic check. | |
1546 | */ | |
1547 | if (likely(sk->sk_rx_dst)) | |
1548 | skb_dst_drop(skb); | |
1549 | else | |
1550 | skb_dst_force(skb); | |
1551 | ||
b2fb4f54 ED |
1552 | __skb_queue_tail(&tp->ucopy.prequeue, skb); |
1553 | tp->ucopy.memory += skb->truesize; | |
1554 | if (tp->ucopy.memory > sk->sk_rcvbuf) { | |
1555 | struct sk_buff *skb1; | |
1556 | ||
1557 | BUG_ON(sock_owned_by_user(sk)); | |
1558 | ||
1559 | while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) { | |
1560 | sk_backlog_rcv(sk, skb1); | |
1561 | NET_INC_STATS_BH(sock_net(sk), | |
1562 | LINUX_MIB_TCPPREQUEUEDROPPED); | |
1563 | } | |
1564 | ||
1565 | tp->ucopy.memory = 0; | |
1566 | } else if (skb_queue_len(&tp->ucopy.prequeue) == 1) { | |
1567 | wake_up_interruptible_sync_poll(sk_sleep(sk), | |
1568 | POLLIN | POLLRDNORM | POLLRDBAND); | |
1569 | if (!inet_csk_ack_scheduled(sk)) | |
1570 | inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK, | |
1571 | (3 * tcp_rto_min(sk)) / 4, | |
1572 | TCP_RTO_MAX); | |
1573 | } | |
1574 | return true; | |
1575 | } | |
1576 | EXPORT_SYMBOL(tcp_prequeue); | |
1577 | ||
1da177e4 LT |
1578 | /* |
1579 | * From tcp_input.c | |
1580 | */ | |
1581 | ||
1582 | int tcp_v4_rcv(struct sk_buff *skb) | |
1583 | { | |
eddc9ec5 | 1584 | const struct iphdr *iph; |
cf533ea5 | 1585 | const struct tcphdr *th; |
1da177e4 LT |
1586 | struct sock *sk; |
1587 | int ret; | |
a86b1e30 | 1588 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
1589 | |
1590 | if (skb->pkt_type != PACKET_HOST) | |
1591 | goto discard_it; | |
1592 | ||
1593 | /* Count it even if it's bad */ | |
63231bdd | 1594 | TCP_INC_STATS_BH(net, TCP_MIB_INSEGS); |
1da177e4 LT |
1595 | |
1596 | if (!pskb_may_pull(skb, sizeof(struct tcphdr))) | |
1597 | goto discard_it; | |
1598 | ||
aa8223c7 | 1599 | th = tcp_hdr(skb); |
1da177e4 LT |
1600 | |
1601 | if (th->doff < sizeof(struct tcphdr) / 4) | |
1602 | goto bad_packet; | |
1603 | if (!pskb_may_pull(skb, th->doff * 4)) | |
1604 | goto discard_it; | |
1605 | ||
1606 | /* An explanation is required here, I think. | |
1607 | * Packet length and doff are validated by header prediction, | |
caa20d9a | 1608 | * provided case of th->doff==0 is eliminated. |
1da177e4 | 1609 | * So, we defer the checks. */ |
ed70fcfc TH |
1610 | |
1611 | if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo)) | |
6a5dc9e5 | 1612 | goto csum_error; |
1da177e4 | 1613 | |
aa8223c7 | 1614 | th = tcp_hdr(skb); |
eddc9ec5 | 1615 | iph = ip_hdr(skb); |
971f10ec ED |
1616 | /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() |
1617 | * barrier() makes sure compiler wont play fool^Waliasing games. | |
1618 | */ | |
1619 | memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), | |
1620 | sizeof(struct inet_skb_parm)); | |
1621 | barrier(); | |
1622 | ||
1da177e4 LT |
1623 | TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
1624 | TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + | |
1625 | skb->len - th->doff * 4); | |
1626 | TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); | |
e11ecddf | 1627 | TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th); |
04317daf | 1628 | TCP_SKB_CB(skb)->tcp_tw_isn = 0; |
b82d1bb4 | 1629 | TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph); |
1da177e4 LT |
1630 | TCP_SKB_CB(skb)->sacked = 0; |
1631 | ||
9a1f27c4 | 1632 | sk = __inet_lookup_skb(&tcp_hashinfo, skb, th->source, th->dest); |
1da177e4 LT |
1633 | if (!sk) |
1634 | goto no_tcp_socket; | |
1635 | ||
bb134d5d ED |
1636 | process: |
1637 | if (sk->sk_state == TCP_TIME_WAIT) | |
1638 | goto do_time_wait; | |
1639 | ||
6cce09f8 ED |
1640 | if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) { |
1641 | NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP); | |
d218d111 | 1642 | goto discard_and_relse; |
6cce09f8 | 1643 | } |
d218d111 | 1644 | |
1da177e4 LT |
1645 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
1646 | goto discard_and_relse; | |
9ea88a15 DP |
1647 | |
1648 | #ifdef CONFIG_TCP_MD5SIG | |
1649 | /* | |
1650 | * We really want to reject the packet as early as possible | |
1651 | * if: | |
1652 | * o We're expecting an MD5'd packet and this is no MD5 tcp option | |
1653 | * o There is an MD5 option and we're not expecting one | |
1654 | */ | |
1655 | if (tcp_v4_inbound_md5_hash(sk, skb)) | |
1656 | goto discard_and_relse; | |
1657 | #endif | |
1658 | ||
b59c2701 | 1659 | nf_reset(skb); |
1da177e4 | 1660 | |
fda9ef5d | 1661 | if (sk_filter(sk, skb)) |
1da177e4 LT |
1662 | goto discard_and_relse; |
1663 | ||
8b80cda5 | 1664 | sk_mark_napi_id(sk, skb); |
1da177e4 LT |
1665 | skb->dev = NULL; |
1666 | ||
c6366184 | 1667 | bh_lock_sock_nested(sk); |
1da177e4 LT |
1668 | ret = 0; |
1669 | if (!sock_owned_by_user(sk)) { | |
7bced397 | 1670 | if (!tcp_prequeue(sk, skb)) |
1da177e4 | 1671 | ret = tcp_v4_do_rcv(sk, skb); |
da882c1f ED |
1672 | } else if (unlikely(sk_add_backlog(sk, skb, |
1673 | sk->sk_rcvbuf + sk->sk_sndbuf))) { | |
6b03a53a | 1674 | bh_unlock_sock(sk); |
6cce09f8 | 1675 | NET_INC_STATS_BH(net, LINUX_MIB_TCPBACKLOGDROP); |
6b03a53a ZY |
1676 | goto discard_and_relse; |
1677 | } | |
1da177e4 LT |
1678 | bh_unlock_sock(sk); |
1679 | ||
1680 | sock_put(sk); | |
1681 | ||
1682 | return ret; | |
1683 | ||
1684 | no_tcp_socket: | |
1685 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1686 | goto discard_it; | |
1687 | ||
1688 | if (skb->len < (th->doff << 2) || tcp_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1689 | csum_error: |
1690 | TCP_INC_STATS_BH(net, TCP_MIB_CSUMERRORS); | |
1da177e4 | 1691 | bad_packet: |
63231bdd | 1692 | TCP_INC_STATS_BH(net, TCP_MIB_INERRS); |
1da177e4 | 1693 | } else { |
cfb6eeb4 | 1694 | tcp_v4_send_reset(NULL, skb); |
1da177e4 LT |
1695 | } |
1696 | ||
1697 | discard_it: | |
1698 | /* Discard frame. */ | |
1699 | kfree_skb(skb); | |
e905a9ed | 1700 | return 0; |
1da177e4 LT |
1701 | |
1702 | discard_and_relse: | |
1703 | sock_put(sk); | |
1704 | goto discard_it; | |
1705 | ||
1706 | do_time_wait: | |
1707 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) { | |
9469c7b4 | 1708 | inet_twsk_put(inet_twsk(sk)); |
1da177e4 LT |
1709 | goto discard_it; |
1710 | } | |
1711 | ||
6a5dc9e5 | 1712 | if (skb->len < (th->doff << 2)) { |
9469c7b4 | 1713 | inet_twsk_put(inet_twsk(sk)); |
6a5dc9e5 ED |
1714 | goto bad_packet; |
1715 | } | |
1716 | if (tcp_checksum_complete(skb)) { | |
1717 | inet_twsk_put(inet_twsk(sk)); | |
1718 | goto csum_error; | |
1da177e4 | 1719 | } |
9469c7b4 | 1720 | switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
1da177e4 | 1721 | case TCP_TW_SYN: { |
c346dca1 | 1722 | struct sock *sk2 = inet_lookup_listener(dev_net(skb->dev), |
c67499c0 | 1723 | &tcp_hashinfo, |
da5e3630 | 1724 | iph->saddr, th->source, |
eddc9ec5 | 1725 | iph->daddr, th->dest, |
463c84b9 | 1726 | inet_iif(skb)); |
1da177e4 | 1727 | if (sk2) { |
9469c7b4 YH |
1728 | inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row); |
1729 | inet_twsk_put(inet_twsk(sk)); | |
1da177e4 LT |
1730 | sk = sk2; |
1731 | goto process; | |
1732 | } | |
1733 | /* Fall through to ACK */ | |
1734 | } | |
1735 | case TCP_TW_ACK: | |
1736 | tcp_v4_timewait_ack(sk, skb); | |
1737 | break; | |
1738 | case TCP_TW_RST: | |
1739 | goto no_tcp_socket; | |
1740 | case TCP_TW_SUCCESS:; | |
1741 | } | |
1742 | goto discard_it; | |
1743 | } | |
1744 | ||
ccb7c410 DM |
1745 | static struct timewait_sock_ops tcp_timewait_sock_ops = { |
1746 | .twsk_obj_size = sizeof(struct tcp_timewait_sock), | |
1747 | .twsk_unique = tcp_twsk_unique, | |
1748 | .twsk_destructor= tcp_twsk_destructor, | |
ccb7c410 | 1749 | }; |
1da177e4 | 1750 | |
63d02d15 | 1751 | void inet_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb) |
5d299f3d ED |
1752 | { |
1753 | struct dst_entry *dst = skb_dst(skb); | |
1754 | ||
ca777eff ED |
1755 | if (dst) { |
1756 | dst_hold(dst); | |
1757 | sk->sk_rx_dst = dst; | |
1758 | inet_sk(sk)->rx_dst_ifindex = skb->skb_iif; | |
1759 | } | |
5d299f3d | 1760 | } |
63d02d15 | 1761 | EXPORT_SYMBOL(inet_sk_rx_dst_set); |
5d299f3d | 1762 | |
3b401a81 | 1763 | const struct inet_connection_sock_af_ops ipv4_specific = { |
543d9cfe ACM |
1764 | .queue_xmit = ip_queue_xmit, |
1765 | .send_check = tcp_v4_send_check, | |
1766 | .rebuild_header = inet_sk_rebuild_header, | |
5d299f3d | 1767 | .sk_rx_dst_set = inet_sk_rx_dst_set, |
543d9cfe ACM |
1768 | .conn_request = tcp_v4_conn_request, |
1769 | .syn_recv_sock = tcp_v4_syn_recv_sock, | |
543d9cfe ACM |
1770 | .net_header_len = sizeof(struct iphdr), |
1771 | .setsockopt = ip_setsockopt, | |
1772 | .getsockopt = ip_getsockopt, | |
1773 | .addr2sockaddr = inet_csk_addr2sockaddr, | |
1774 | .sockaddr_len = sizeof(struct sockaddr_in), | |
ab1e0a13 | 1775 | .bind_conflict = inet_csk_bind_conflict, |
3fdadf7d | 1776 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1777 | .compat_setsockopt = compat_ip_setsockopt, |
1778 | .compat_getsockopt = compat_ip_getsockopt, | |
3fdadf7d | 1779 | #endif |
4fab9071 | 1780 | .mtu_reduced = tcp_v4_mtu_reduced, |
1da177e4 | 1781 | }; |
4bc2f18b | 1782 | EXPORT_SYMBOL(ipv4_specific); |
1da177e4 | 1783 | |
cfb6eeb4 | 1784 | #ifdef CONFIG_TCP_MD5SIG |
b2e4b3de | 1785 | static const struct tcp_sock_af_ops tcp_sock_ipv4_specific = { |
cfb6eeb4 | 1786 | .md5_lookup = tcp_v4_md5_lookup, |
49a72dfb | 1787 | .calc_md5_hash = tcp_v4_md5_hash_skb, |
cfb6eeb4 | 1788 | .md5_parse = tcp_v4_parse_md5_keys, |
cfb6eeb4 | 1789 | }; |
b6332e6c | 1790 | #endif |
cfb6eeb4 | 1791 | |
1da177e4 LT |
1792 | /* NOTE: A lot of things set to zero explicitly by call to |
1793 | * sk_alloc() so need not be done here. | |
1794 | */ | |
1795 | static int tcp_v4_init_sock(struct sock *sk) | |
1796 | { | |
6687e988 | 1797 | struct inet_connection_sock *icsk = inet_csk(sk); |
1da177e4 | 1798 | |
900f65d3 | 1799 | tcp_init_sock(sk); |
1da177e4 | 1800 | |
8292a17a | 1801 | icsk->icsk_af_ops = &ipv4_specific; |
900f65d3 | 1802 | |
cfb6eeb4 | 1803 | #ifdef CONFIG_TCP_MD5SIG |
ac807fa8 | 1804 | tcp_sk(sk)->af_specific = &tcp_sock_ipv4_specific; |
cfb6eeb4 | 1805 | #endif |
1da177e4 | 1806 | |
1da177e4 LT |
1807 | return 0; |
1808 | } | |
1809 | ||
7d06b2e0 | 1810 | void tcp_v4_destroy_sock(struct sock *sk) |
1da177e4 LT |
1811 | { |
1812 | struct tcp_sock *tp = tcp_sk(sk); | |
1813 | ||
1814 | tcp_clear_xmit_timers(sk); | |
1815 | ||
6687e988 | 1816 | tcp_cleanup_congestion_control(sk); |
317a76f9 | 1817 | |
1da177e4 | 1818 | /* Cleanup up the write buffer. */ |
fe067e8a | 1819 | tcp_write_queue_purge(sk); |
1da177e4 LT |
1820 | |
1821 | /* Cleans up our, hopefully empty, out_of_order_queue. */ | |
e905a9ed | 1822 | __skb_queue_purge(&tp->out_of_order_queue); |
1da177e4 | 1823 | |
cfb6eeb4 YH |
1824 | #ifdef CONFIG_TCP_MD5SIG |
1825 | /* Clean up the MD5 key list, if any */ | |
1826 | if (tp->md5sig_info) { | |
a915da9b | 1827 | tcp_clear_md5_list(sk); |
a8afca03 | 1828 | kfree_rcu(tp->md5sig_info, rcu); |
cfb6eeb4 YH |
1829 | tp->md5sig_info = NULL; |
1830 | } | |
1831 | #endif | |
1a2449a8 | 1832 | |
1da177e4 LT |
1833 | /* Clean prequeue, it must be empty really */ |
1834 | __skb_queue_purge(&tp->ucopy.prequeue); | |
1835 | ||
1836 | /* Clean up a referenced TCP bind bucket. */ | |
463c84b9 | 1837 | if (inet_csk(sk)->icsk_bind_hash) |
ab1e0a13 | 1838 | inet_put_port(sk); |
1da177e4 | 1839 | |
168a8f58 | 1840 | BUG_ON(tp->fastopen_rsk != NULL); |
435cf559 | 1841 | |
cf60af03 YC |
1842 | /* If socket is aborted during connect operation */ |
1843 | tcp_free_fastopen_req(tp); | |
1844 | ||
180d8cd9 | 1845 | sk_sockets_allocated_dec(sk); |
d1a4c0b3 | 1846 | sock_release_memcg(sk); |
1da177e4 | 1847 | } |
1da177e4 LT |
1848 | EXPORT_SYMBOL(tcp_v4_destroy_sock); |
1849 | ||
1850 | #ifdef CONFIG_PROC_FS | |
1851 | /* Proc filesystem TCP sock list dumping. */ | |
1852 | ||
a8b690f9 TH |
1853 | /* |
1854 | * Get next listener socket follow cur. If cur is NULL, get first socket | |
1855 | * starting from bucket given in st->bucket; when st->bucket is zero the | |
1856 | * very first socket in the hash table is returned. | |
1857 | */ | |
1da177e4 LT |
1858 | static void *listening_get_next(struct seq_file *seq, void *cur) |
1859 | { | |
463c84b9 | 1860 | struct inet_connection_sock *icsk; |
c25eb3bf | 1861 | struct hlist_nulls_node *node; |
1da177e4 | 1862 | struct sock *sk = cur; |
5caea4ea | 1863 | struct inet_listen_hashbucket *ilb; |
5799de0b | 1864 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 1865 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1866 | |
1867 | if (!sk) { | |
a8b690f9 | 1868 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
5caea4ea | 1869 | spin_lock_bh(&ilb->lock); |
c25eb3bf | 1870 | sk = sk_nulls_head(&ilb->head); |
a8b690f9 | 1871 | st->offset = 0; |
1da177e4 LT |
1872 | goto get_sk; |
1873 | } | |
5caea4ea | 1874 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
1da177e4 | 1875 | ++st->num; |
a8b690f9 | 1876 | ++st->offset; |
1da177e4 LT |
1877 | |
1878 | if (st->state == TCP_SEQ_STATE_OPENREQ) { | |
60236fdd | 1879 | struct request_sock *req = cur; |
1da177e4 | 1880 | |
72a3effa | 1881 | icsk = inet_csk(st->syn_wait_sk); |
1da177e4 LT |
1882 | req = req->dl_next; |
1883 | while (1) { | |
1884 | while (req) { | |
bdccc4ca | 1885 | if (req->rsk_ops->family == st->family) { |
1da177e4 LT |
1886 | cur = req; |
1887 | goto out; | |
1888 | } | |
1889 | req = req->dl_next; | |
1890 | } | |
72a3effa | 1891 | if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries) |
1da177e4 LT |
1892 | break; |
1893 | get_req: | |
463c84b9 | 1894 | req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket]; |
1da177e4 | 1895 | } |
1bde5ac4 | 1896 | sk = sk_nulls_next(st->syn_wait_sk); |
1da177e4 | 1897 | st->state = TCP_SEQ_STATE_LISTENING; |
463c84b9 | 1898 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1899 | } else { |
e905a9ed | 1900 | icsk = inet_csk(sk); |
463c84b9 ACM |
1901 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1902 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) | |
1da177e4 | 1903 | goto start_req; |
463c84b9 | 1904 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1bde5ac4 | 1905 | sk = sk_nulls_next(sk); |
1da177e4 LT |
1906 | } |
1907 | get_sk: | |
c25eb3bf | 1908 | sk_nulls_for_each_from(sk, node) { |
8475ef9f PE |
1909 | if (!net_eq(sock_net(sk), net)) |
1910 | continue; | |
1911 | if (sk->sk_family == st->family) { | |
1da177e4 LT |
1912 | cur = sk; |
1913 | goto out; | |
1914 | } | |
e905a9ed | 1915 | icsk = inet_csk(sk); |
463c84b9 ACM |
1916 | read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1917 | if (reqsk_queue_len(&icsk->icsk_accept_queue)) { | |
1da177e4 LT |
1918 | start_req: |
1919 | st->uid = sock_i_uid(sk); | |
1920 | st->syn_wait_sk = sk; | |
1921 | st->state = TCP_SEQ_STATE_OPENREQ; | |
1922 | st->sbucket = 0; | |
1923 | goto get_req; | |
1924 | } | |
463c84b9 | 1925 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); |
1da177e4 | 1926 | } |
5caea4ea | 1927 | spin_unlock_bh(&ilb->lock); |
a8b690f9 | 1928 | st->offset = 0; |
0f7ff927 | 1929 | if (++st->bucket < INET_LHTABLE_SIZE) { |
5caea4ea ED |
1930 | ilb = &tcp_hashinfo.listening_hash[st->bucket]; |
1931 | spin_lock_bh(&ilb->lock); | |
c25eb3bf | 1932 | sk = sk_nulls_head(&ilb->head); |
1da177e4 LT |
1933 | goto get_sk; |
1934 | } | |
1935 | cur = NULL; | |
1936 | out: | |
1937 | return cur; | |
1938 | } | |
1939 | ||
1940 | static void *listening_get_idx(struct seq_file *seq, loff_t *pos) | |
1941 | { | |
a8b690f9 TH |
1942 | struct tcp_iter_state *st = seq->private; |
1943 | void *rc; | |
1944 | ||
1945 | st->bucket = 0; | |
1946 | st->offset = 0; | |
1947 | rc = listening_get_next(seq, NULL); | |
1da177e4 LT |
1948 | |
1949 | while (rc && *pos) { | |
1950 | rc = listening_get_next(seq, rc); | |
1951 | --*pos; | |
1952 | } | |
1953 | return rc; | |
1954 | } | |
1955 | ||
05dbc7b5 | 1956 | static inline bool empty_bucket(const struct tcp_iter_state *st) |
6eac5604 | 1957 | { |
05dbc7b5 | 1958 | return hlist_nulls_empty(&tcp_hashinfo.ehash[st->bucket].chain); |
6eac5604 AK |
1959 | } |
1960 | ||
a8b690f9 TH |
1961 | /* |
1962 | * Get first established socket starting from bucket given in st->bucket. | |
1963 | * If st->bucket is zero, the very first socket in the hash is returned. | |
1964 | */ | |
1da177e4 LT |
1965 | static void *established_get_first(struct seq_file *seq) |
1966 | { | |
5799de0b | 1967 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 1968 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1969 | void *rc = NULL; |
1970 | ||
a8b690f9 TH |
1971 | st->offset = 0; |
1972 | for (; st->bucket <= tcp_hashinfo.ehash_mask; ++st->bucket) { | |
1da177e4 | 1973 | struct sock *sk; |
3ab5aee7 | 1974 | struct hlist_nulls_node *node; |
9db66bdc | 1975 | spinlock_t *lock = inet_ehash_lockp(&tcp_hashinfo, st->bucket); |
1da177e4 | 1976 | |
6eac5604 AK |
1977 | /* Lockless fast path for the common case of empty buckets */ |
1978 | if (empty_bucket(st)) | |
1979 | continue; | |
1980 | ||
9db66bdc | 1981 | spin_lock_bh(lock); |
3ab5aee7 | 1982 | sk_nulls_for_each(sk, node, &tcp_hashinfo.ehash[st->bucket].chain) { |
f40c8174 | 1983 | if (sk->sk_family != st->family || |
878628fb | 1984 | !net_eq(sock_net(sk), net)) { |
1da177e4 LT |
1985 | continue; |
1986 | } | |
1987 | rc = sk; | |
1988 | goto out; | |
1989 | } | |
9db66bdc | 1990 | spin_unlock_bh(lock); |
1da177e4 LT |
1991 | } |
1992 | out: | |
1993 | return rc; | |
1994 | } | |
1995 | ||
1996 | static void *established_get_next(struct seq_file *seq, void *cur) | |
1997 | { | |
1998 | struct sock *sk = cur; | |
3ab5aee7 | 1999 | struct hlist_nulls_node *node; |
5799de0b | 2000 | struct tcp_iter_state *st = seq->private; |
a4146b1b | 2001 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2002 | |
2003 | ++st->num; | |
a8b690f9 | 2004 | ++st->offset; |
1da177e4 | 2005 | |
05dbc7b5 | 2006 | sk = sk_nulls_next(sk); |
1da177e4 | 2007 | |
3ab5aee7 | 2008 | sk_nulls_for_each_from(sk, node) { |
878628fb | 2009 | if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) |
05dbc7b5 | 2010 | return sk; |
1da177e4 LT |
2011 | } |
2012 | ||
05dbc7b5 ED |
2013 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
2014 | ++st->bucket; | |
2015 | return established_get_first(seq); | |
1da177e4 LT |
2016 | } |
2017 | ||
2018 | static void *established_get_idx(struct seq_file *seq, loff_t pos) | |
2019 | { | |
a8b690f9 TH |
2020 | struct tcp_iter_state *st = seq->private; |
2021 | void *rc; | |
2022 | ||
2023 | st->bucket = 0; | |
2024 | rc = established_get_first(seq); | |
1da177e4 LT |
2025 | |
2026 | while (rc && pos) { | |
2027 | rc = established_get_next(seq, rc); | |
2028 | --pos; | |
7174259e | 2029 | } |
1da177e4 LT |
2030 | return rc; |
2031 | } | |
2032 | ||
2033 | static void *tcp_get_idx(struct seq_file *seq, loff_t pos) | |
2034 | { | |
2035 | void *rc; | |
5799de0b | 2036 | struct tcp_iter_state *st = seq->private; |
1da177e4 | 2037 | |
1da177e4 LT |
2038 | st->state = TCP_SEQ_STATE_LISTENING; |
2039 | rc = listening_get_idx(seq, &pos); | |
2040 | ||
2041 | if (!rc) { | |
1da177e4 LT |
2042 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
2043 | rc = established_get_idx(seq, pos); | |
2044 | } | |
2045 | ||
2046 | return rc; | |
2047 | } | |
2048 | ||
a8b690f9 TH |
2049 | static void *tcp_seek_last_pos(struct seq_file *seq) |
2050 | { | |
2051 | struct tcp_iter_state *st = seq->private; | |
2052 | int offset = st->offset; | |
2053 | int orig_num = st->num; | |
2054 | void *rc = NULL; | |
2055 | ||
2056 | switch (st->state) { | |
2057 | case TCP_SEQ_STATE_OPENREQ: | |
2058 | case TCP_SEQ_STATE_LISTENING: | |
2059 | if (st->bucket >= INET_LHTABLE_SIZE) | |
2060 | break; | |
2061 | st->state = TCP_SEQ_STATE_LISTENING; | |
2062 | rc = listening_get_next(seq, NULL); | |
2063 | while (offset-- && rc) | |
2064 | rc = listening_get_next(seq, rc); | |
2065 | if (rc) | |
2066 | break; | |
2067 | st->bucket = 0; | |
05dbc7b5 | 2068 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
a8b690f9 TH |
2069 | /* Fallthrough */ |
2070 | case TCP_SEQ_STATE_ESTABLISHED: | |
a8b690f9 TH |
2071 | if (st->bucket > tcp_hashinfo.ehash_mask) |
2072 | break; | |
2073 | rc = established_get_first(seq); | |
2074 | while (offset-- && rc) | |
2075 | rc = established_get_next(seq, rc); | |
2076 | } | |
2077 | ||
2078 | st->num = orig_num; | |
2079 | ||
2080 | return rc; | |
2081 | } | |
2082 | ||
1da177e4 LT |
2083 | static void *tcp_seq_start(struct seq_file *seq, loff_t *pos) |
2084 | { | |
5799de0b | 2085 | struct tcp_iter_state *st = seq->private; |
a8b690f9 TH |
2086 | void *rc; |
2087 | ||
2088 | if (*pos && *pos == st->last_pos) { | |
2089 | rc = tcp_seek_last_pos(seq); | |
2090 | if (rc) | |
2091 | goto out; | |
2092 | } | |
2093 | ||
1da177e4 LT |
2094 | st->state = TCP_SEQ_STATE_LISTENING; |
2095 | st->num = 0; | |
a8b690f9 TH |
2096 | st->bucket = 0; |
2097 | st->offset = 0; | |
2098 | rc = *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2099 | ||
2100 | out: | |
2101 | st->last_pos = *pos; | |
2102 | return rc; | |
1da177e4 LT |
2103 | } |
2104 | ||
2105 | static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2106 | { | |
a8b690f9 | 2107 | struct tcp_iter_state *st = seq->private; |
1da177e4 | 2108 | void *rc = NULL; |
1da177e4 LT |
2109 | |
2110 | if (v == SEQ_START_TOKEN) { | |
2111 | rc = tcp_get_idx(seq, 0); | |
2112 | goto out; | |
2113 | } | |
1da177e4 LT |
2114 | |
2115 | switch (st->state) { | |
2116 | case TCP_SEQ_STATE_OPENREQ: | |
2117 | case TCP_SEQ_STATE_LISTENING: | |
2118 | rc = listening_get_next(seq, v); | |
2119 | if (!rc) { | |
1da177e4 | 2120 | st->state = TCP_SEQ_STATE_ESTABLISHED; |
a8b690f9 TH |
2121 | st->bucket = 0; |
2122 | st->offset = 0; | |
1da177e4 LT |
2123 | rc = established_get_first(seq); |
2124 | } | |
2125 | break; | |
2126 | case TCP_SEQ_STATE_ESTABLISHED: | |
1da177e4 LT |
2127 | rc = established_get_next(seq, v); |
2128 | break; | |
2129 | } | |
2130 | out: | |
2131 | ++*pos; | |
a8b690f9 | 2132 | st->last_pos = *pos; |
1da177e4 LT |
2133 | return rc; |
2134 | } | |
2135 | ||
2136 | static void tcp_seq_stop(struct seq_file *seq, void *v) | |
2137 | { | |
5799de0b | 2138 | struct tcp_iter_state *st = seq->private; |
1da177e4 LT |
2139 | |
2140 | switch (st->state) { | |
2141 | case TCP_SEQ_STATE_OPENREQ: | |
2142 | if (v) { | |
463c84b9 ACM |
2143 | struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk); |
2144 | read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock); | |
1da177e4 LT |
2145 | } |
2146 | case TCP_SEQ_STATE_LISTENING: | |
2147 | if (v != SEQ_START_TOKEN) | |
5caea4ea | 2148 | spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock); |
1da177e4 | 2149 | break; |
1da177e4 LT |
2150 | case TCP_SEQ_STATE_ESTABLISHED: |
2151 | if (v) | |
9db66bdc | 2152 | spin_unlock_bh(inet_ehash_lockp(&tcp_hashinfo, st->bucket)); |
1da177e4 LT |
2153 | break; |
2154 | } | |
2155 | } | |
2156 | ||
73cb88ec | 2157 | int tcp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2158 | { |
d9dda78b | 2159 | struct tcp_seq_afinfo *afinfo = PDE_DATA(inode); |
1da177e4 | 2160 | struct tcp_iter_state *s; |
52d6f3f1 | 2161 | int err; |
1da177e4 | 2162 | |
52d6f3f1 DL |
2163 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2164 | sizeof(struct tcp_iter_state)); | |
2165 | if (err < 0) | |
2166 | return err; | |
f40c8174 | 2167 | |
52d6f3f1 | 2168 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2169 | s->family = afinfo->family; |
688d1945 | 2170 | s->last_pos = 0; |
f40c8174 DL |
2171 | return 0; |
2172 | } | |
73cb88ec | 2173 | EXPORT_SYMBOL(tcp_seq_open); |
f40c8174 | 2174 | |
6f8b13bc | 2175 | int tcp_proc_register(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 LT |
2176 | { |
2177 | int rc = 0; | |
2178 | struct proc_dir_entry *p; | |
2179 | ||
9427c4b3 DL |
2180 | afinfo->seq_ops.start = tcp_seq_start; |
2181 | afinfo->seq_ops.next = tcp_seq_next; | |
2182 | afinfo->seq_ops.stop = tcp_seq_stop; | |
2183 | ||
84841c3c | 2184 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2185 | afinfo->seq_fops, afinfo); |
84841c3c | 2186 | if (!p) |
1da177e4 LT |
2187 | rc = -ENOMEM; |
2188 | return rc; | |
2189 | } | |
4bc2f18b | 2190 | EXPORT_SYMBOL(tcp_proc_register); |
1da177e4 | 2191 | |
6f8b13bc | 2192 | void tcp_proc_unregister(struct net *net, struct tcp_seq_afinfo *afinfo) |
1da177e4 | 2193 | { |
ece31ffd | 2194 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2195 | } |
4bc2f18b | 2196 | EXPORT_SYMBOL(tcp_proc_unregister); |
1da177e4 | 2197 | |
cf533ea5 | 2198 | static void get_openreq4(const struct sock *sk, const struct request_sock *req, |
652586df | 2199 | struct seq_file *f, int i, kuid_t uid) |
1da177e4 | 2200 | { |
2e6599cb | 2201 | const struct inet_request_sock *ireq = inet_rsk(req); |
a399a805 | 2202 | long delta = req->expires - jiffies; |
1da177e4 | 2203 | |
5e659e4c | 2204 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
652586df | 2205 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %u %d %pK", |
1da177e4 | 2206 | i, |
634fb979 | 2207 | ireq->ir_loc_addr, |
c720c7e8 | 2208 | ntohs(inet_sk(sk)->inet_sport), |
634fb979 ED |
2209 | ireq->ir_rmt_addr, |
2210 | ntohs(ireq->ir_rmt_port), | |
1da177e4 LT |
2211 | TCP_SYN_RECV, |
2212 | 0, 0, /* could print option size, but that is af dependent. */ | |
2213 | 1, /* timers active (only the expire timer) */ | |
a399a805 | 2214 | jiffies_delta_to_clock_t(delta), |
e6c022a4 | 2215 | req->num_timeout, |
a7cb5a49 | 2216 | from_kuid_munged(seq_user_ns(f), uid), |
1da177e4 LT |
2217 | 0, /* non standard timer */ |
2218 | 0, /* open_requests have no inode */ | |
2219 | atomic_read(&sk->sk_refcnt), | |
652586df | 2220 | req); |
1da177e4 LT |
2221 | } |
2222 | ||
652586df | 2223 | static void get_tcp4_sock(struct sock *sk, struct seq_file *f, int i) |
1da177e4 LT |
2224 | { |
2225 | int timer_active; | |
2226 | unsigned long timer_expires; | |
cf533ea5 | 2227 | const struct tcp_sock *tp = tcp_sk(sk); |
cf4c6bf8 | 2228 | const struct inet_connection_sock *icsk = inet_csk(sk); |
cf533ea5 | 2229 | const struct inet_sock *inet = inet_sk(sk); |
168a8f58 | 2230 | struct fastopen_queue *fastopenq = icsk->icsk_accept_queue.fastopenq; |
c720c7e8 ED |
2231 | __be32 dest = inet->inet_daddr; |
2232 | __be32 src = inet->inet_rcv_saddr; | |
2233 | __u16 destp = ntohs(inet->inet_dport); | |
2234 | __u16 srcp = ntohs(inet->inet_sport); | |
49d09007 | 2235 | int rx_queue; |
1da177e4 | 2236 | |
6ba8a3b1 ND |
2237 | if (icsk->icsk_pending == ICSK_TIME_RETRANS || |
2238 | icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS || | |
2239 | icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) { | |
1da177e4 | 2240 | timer_active = 1; |
463c84b9 ACM |
2241 | timer_expires = icsk->icsk_timeout; |
2242 | } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { | |
1da177e4 | 2243 | timer_active = 4; |
463c84b9 | 2244 | timer_expires = icsk->icsk_timeout; |
cf4c6bf8 | 2245 | } else if (timer_pending(&sk->sk_timer)) { |
1da177e4 | 2246 | timer_active = 2; |
cf4c6bf8 | 2247 | timer_expires = sk->sk_timer.expires; |
1da177e4 LT |
2248 | } else { |
2249 | timer_active = 0; | |
2250 | timer_expires = jiffies; | |
2251 | } | |
2252 | ||
49d09007 ED |
2253 | if (sk->sk_state == TCP_LISTEN) |
2254 | rx_queue = sk->sk_ack_backlog; | |
2255 | else | |
2256 | /* | |
2257 | * because we dont lock socket, we might find a transient negative value | |
2258 | */ | |
2259 | rx_queue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); | |
2260 | ||
5e659e4c | 2261 | seq_printf(f, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX " |
652586df | 2262 | "%08X %5u %8d %lu %d %pK %lu %lu %u %u %d", |
cf4c6bf8 | 2263 | i, src, srcp, dest, destp, sk->sk_state, |
47da8ee6 | 2264 | tp->write_seq - tp->snd_una, |
49d09007 | 2265 | rx_queue, |
1da177e4 | 2266 | timer_active, |
a399a805 | 2267 | jiffies_delta_to_clock_t(timer_expires - jiffies), |
463c84b9 | 2268 | icsk->icsk_retransmits, |
a7cb5a49 | 2269 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sk)), |
6687e988 | 2270 | icsk->icsk_probes_out, |
cf4c6bf8 IJ |
2271 | sock_i_ino(sk), |
2272 | atomic_read(&sk->sk_refcnt), sk, | |
7be87351 SH |
2273 | jiffies_to_clock_t(icsk->icsk_rto), |
2274 | jiffies_to_clock_t(icsk->icsk_ack.ato), | |
463c84b9 | 2275 | (icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong, |
1da177e4 | 2276 | tp->snd_cwnd, |
168a8f58 JC |
2277 | sk->sk_state == TCP_LISTEN ? |
2278 | (fastopenq ? fastopenq->max_qlen : 0) : | |
652586df | 2279 | (tcp_in_initial_slowstart(tp) ? -1 : tp->snd_ssthresh)); |
1da177e4 LT |
2280 | } |
2281 | ||
cf533ea5 | 2282 | static void get_timewait4_sock(const struct inet_timewait_sock *tw, |
652586df | 2283 | struct seq_file *f, int i) |
1da177e4 | 2284 | { |
23f33c2d | 2285 | __be32 dest, src; |
1da177e4 | 2286 | __u16 destp, srcp; |
e2a1d3e4 | 2287 | s32 delta = tw->tw_ttd - inet_tw_time_stamp(); |
1da177e4 LT |
2288 | |
2289 | dest = tw->tw_daddr; | |
2290 | src = tw->tw_rcv_saddr; | |
2291 | destp = ntohs(tw->tw_dport); | |
2292 | srcp = ntohs(tw->tw_sport); | |
2293 | ||
5e659e4c | 2294 | seq_printf(f, "%4d: %08X:%04X %08X:%04X" |
652586df | 2295 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %pK", |
1da177e4 | 2296 | i, src, srcp, dest, destp, tw->tw_substate, 0, 0, |
a399a805 | 2297 | 3, jiffies_delta_to_clock_t(delta), 0, 0, 0, 0, |
652586df | 2298 | atomic_read(&tw->tw_refcnt), tw); |
1da177e4 LT |
2299 | } |
2300 | ||
2301 | #define TMPSZ 150 | |
2302 | ||
2303 | static int tcp4_seq_show(struct seq_file *seq, void *v) | |
2304 | { | |
5799de0b | 2305 | struct tcp_iter_state *st; |
05dbc7b5 | 2306 | struct sock *sk = v; |
1da177e4 | 2307 | |
652586df | 2308 | seq_setwidth(seq, TMPSZ - 1); |
1da177e4 | 2309 | if (v == SEQ_START_TOKEN) { |
652586df | 2310 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
1da177e4 LT |
2311 | "rx_queue tr tm->when retrnsmt uid timeout " |
2312 | "inode"); | |
2313 | goto out; | |
2314 | } | |
2315 | st = seq->private; | |
2316 | ||
2317 | switch (st->state) { | |
2318 | case TCP_SEQ_STATE_LISTENING: | |
2319 | case TCP_SEQ_STATE_ESTABLISHED: | |
05dbc7b5 | 2320 | if (sk->sk_state == TCP_TIME_WAIT) |
652586df | 2321 | get_timewait4_sock(v, seq, st->num); |
05dbc7b5 | 2322 | else |
652586df | 2323 | get_tcp4_sock(v, seq, st->num); |
1da177e4 LT |
2324 | break; |
2325 | case TCP_SEQ_STATE_OPENREQ: | |
652586df | 2326 | get_openreq4(st->syn_wait_sk, v, seq, st->num, st->uid); |
1da177e4 LT |
2327 | break; |
2328 | } | |
1da177e4 | 2329 | out: |
652586df | 2330 | seq_pad(seq, '\n'); |
1da177e4 LT |
2331 | return 0; |
2332 | } | |
2333 | ||
73cb88ec AV |
2334 | static const struct file_operations tcp_afinfo_seq_fops = { |
2335 | .owner = THIS_MODULE, | |
2336 | .open = tcp_seq_open, | |
2337 | .read = seq_read, | |
2338 | .llseek = seq_lseek, | |
2339 | .release = seq_release_net | |
2340 | }; | |
2341 | ||
1da177e4 | 2342 | static struct tcp_seq_afinfo tcp4_seq_afinfo = { |
1da177e4 LT |
2343 | .name = "tcp", |
2344 | .family = AF_INET, | |
73cb88ec | 2345 | .seq_fops = &tcp_afinfo_seq_fops, |
9427c4b3 DL |
2346 | .seq_ops = { |
2347 | .show = tcp4_seq_show, | |
2348 | }, | |
1da177e4 LT |
2349 | }; |
2350 | ||
2c8c1e72 | 2351 | static int __net_init tcp4_proc_init_net(struct net *net) |
757764f6 PE |
2352 | { |
2353 | return tcp_proc_register(net, &tcp4_seq_afinfo); | |
2354 | } | |
2355 | ||
2c8c1e72 | 2356 | static void __net_exit tcp4_proc_exit_net(struct net *net) |
757764f6 PE |
2357 | { |
2358 | tcp_proc_unregister(net, &tcp4_seq_afinfo); | |
2359 | } | |
2360 | ||
2361 | static struct pernet_operations tcp4_net_ops = { | |
2362 | .init = tcp4_proc_init_net, | |
2363 | .exit = tcp4_proc_exit_net, | |
2364 | }; | |
2365 | ||
1da177e4 LT |
2366 | int __init tcp4_proc_init(void) |
2367 | { | |
757764f6 | 2368 | return register_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2369 | } |
2370 | ||
2371 | void tcp4_proc_exit(void) | |
2372 | { | |
757764f6 | 2373 | unregister_pernet_subsys(&tcp4_net_ops); |
1da177e4 LT |
2374 | } |
2375 | #endif /* CONFIG_PROC_FS */ | |
2376 | ||
2377 | struct proto tcp_prot = { | |
2378 | .name = "TCP", | |
2379 | .owner = THIS_MODULE, | |
2380 | .close = tcp_close, | |
2381 | .connect = tcp_v4_connect, | |
2382 | .disconnect = tcp_disconnect, | |
463c84b9 | 2383 | .accept = inet_csk_accept, |
1da177e4 LT |
2384 | .ioctl = tcp_ioctl, |
2385 | .init = tcp_v4_init_sock, | |
2386 | .destroy = tcp_v4_destroy_sock, | |
2387 | .shutdown = tcp_shutdown, | |
2388 | .setsockopt = tcp_setsockopt, | |
2389 | .getsockopt = tcp_getsockopt, | |
1da177e4 | 2390 | .recvmsg = tcp_recvmsg, |
7ba42910 CG |
2391 | .sendmsg = tcp_sendmsg, |
2392 | .sendpage = tcp_sendpage, | |
1da177e4 | 2393 | .backlog_rcv = tcp_v4_do_rcv, |
46d3ceab | 2394 | .release_cb = tcp_release_cb, |
ab1e0a13 ACM |
2395 | .hash = inet_hash, |
2396 | .unhash = inet_unhash, | |
2397 | .get_port = inet_csk_get_port, | |
1da177e4 | 2398 | .enter_memory_pressure = tcp_enter_memory_pressure, |
c9bee3b7 | 2399 | .stream_memory_free = tcp_stream_memory_free, |
1da177e4 | 2400 | .sockets_allocated = &tcp_sockets_allocated, |
0a5578cf | 2401 | .orphan_count = &tcp_orphan_count, |
1da177e4 LT |
2402 | .memory_allocated = &tcp_memory_allocated, |
2403 | .memory_pressure = &tcp_memory_pressure, | |
a4fe34bf | 2404 | .sysctl_mem = sysctl_tcp_mem, |
1da177e4 LT |
2405 | .sysctl_wmem = sysctl_tcp_wmem, |
2406 | .sysctl_rmem = sysctl_tcp_rmem, | |
2407 | .max_header = MAX_TCP_HEADER, | |
2408 | .obj_size = sizeof(struct tcp_sock), | |
3ab5aee7 | 2409 | .slab_flags = SLAB_DESTROY_BY_RCU, |
6d6ee43e | 2410 | .twsk_prot = &tcp_timewait_sock_ops, |
60236fdd | 2411 | .rsk_prot = &tcp_request_sock_ops, |
39d8cda7 | 2412 | .h.hashinfo = &tcp_hashinfo, |
7ba42910 | 2413 | .no_autobind = true, |
543d9cfe ACM |
2414 | #ifdef CONFIG_COMPAT |
2415 | .compat_setsockopt = compat_tcp_setsockopt, | |
2416 | .compat_getsockopt = compat_tcp_getsockopt, | |
2417 | #endif | |
c255a458 | 2418 | #ifdef CONFIG_MEMCG_KMEM |
d1a4c0b3 GC |
2419 | .init_cgroup = tcp_init_cgroup, |
2420 | .destroy_cgroup = tcp_destroy_cgroup, | |
2421 | .proto_cgroup = tcp_proto_cgroup, | |
2422 | #endif | |
1da177e4 | 2423 | }; |
4bc2f18b | 2424 | EXPORT_SYMBOL(tcp_prot); |
1da177e4 | 2425 | |
046ee902 DL |
2426 | static int __net_init tcp_sk_init(struct net *net) |
2427 | { | |
5d134f1c | 2428 | net->ipv4.sysctl_tcp_ecn = 2; |
be9f4a44 | 2429 | return 0; |
046ee902 DL |
2430 | } |
2431 | ||
2432 | static void __net_exit tcp_sk_exit(struct net *net) | |
2433 | { | |
b099ce26 EB |
2434 | } |
2435 | ||
2436 | static void __net_exit tcp_sk_exit_batch(struct list_head *net_exit_list) | |
2437 | { | |
2438 | inet_twsk_purge(&tcp_hashinfo, &tcp_death_row, AF_INET); | |
046ee902 DL |
2439 | } |
2440 | ||
2441 | static struct pernet_operations __net_initdata tcp_sk_ops = { | |
b099ce26 EB |
2442 | .init = tcp_sk_init, |
2443 | .exit = tcp_sk_exit, | |
2444 | .exit_batch = tcp_sk_exit_batch, | |
046ee902 DL |
2445 | }; |
2446 | ||
9b0f976f | 2447 | void __init tcp_v4_init(void) |
1da177e4 | 2448 | { |
5caea4ea | 2449 | inet_hashinfo_init(&tcp_hashinfo); |
6a1b3054 | 2450 | if (register_pernet_subsys(&tcp_sk_ops)) |
1da177e4 | 2451 | panic("Failed to create the TCP control socket.\n"); |
1da177e4 | 2452 | } |