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3f421baa ACM |
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 | * Support for INET connection oriented protocols. | |
7 | * | |
8 | * Authors: See the TCP sources | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or(at your option) any later version. | |
14 | */ | |
15 | ||
3f421baa ACM |
16 | #include <linux/module.h> |
17 | #include <linux/jhash.h> | |
18 | ||
19 | #include <net/inet_connection_sock.h> | |
20 | #include <net/inet_hashtables.h> | |
21 | #include <net/inet_timewait_sock.h> | |
22 | #include <net/ip.h> | |
23 | #include <net/route.h> | |
24 | #include <net/tcp_states.h> | |
a019d6fe | 25 | #include <net/xfrm.h> |
fa76ce73 | 26 | #include <net/tcp.h> |
c125e80b | 27 | #include <net/sock_reuseport.h> |
9691724e | 28 | #include <net/addrconf.h> |
3f421baa | 29 | |
fe38d2a1 JB |
30 | #if IS_ENABLED(CONFIG_IPV6) |
31 | /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6 | |
32 | * only, and any IPv4 addresses if not IPv6 only | |
33 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
34 | * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY, | |
35 | * and 0.0.0.0 equals to 0.0.0.0 only | |
36 | */ | |
7016e062 JP |
37 | static bool ipv6_rcv_saddr_equal(const struct in6_addr *sk1_rcv_saddr6, |
38 | const struct in6_addr *sk2_rcv_saddr6, | |
39 | __be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr, | |
40 | bool sk1_ipv6only, bool sk2_ipv6only, | |
41 | bool match_wildcard) | |
fe38d2a1 | 42 | { |
637bc8bb | 43 | int addr_type = ipv6_addr_type(sk1_rcv_saddr6); |
fe38d2a1 JB |
44 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
45 | ||
46 | /* if both are mapped, treat as IPv4 */ | |
47 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) { | |
48 | if (!sk2_ipv6only) { | |
637bc8bb | 49 | if (sk1_rcv_saddr == sk2_rcv_saddr) |
7016e062 | 50 | return true; |
637bc8bb | 51 | if (!sk1_rcv_saddr || !sk2_rcv_saddr) |
fe38d2a1 JB |
52 | return match_wildcard; |
53 | } | |
7016e062 | 54 | return false; |
fe38d2a1 JB |
55 | } |
56 | ||
57 | if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY) | |
7016e062 | 58 | return true; |
fe38d2a1 JB |
59 | |
60 | if (addr_type2 == IPV6_ADDR_ANY && match_wildcard && | |
61 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
7016e062 | 62 | return true; |
fe38d2a1 JB |
63 | |
64 | if (addr_type == IPV6_ADDR_ANY && match_wildcard && | |
637bc8bb | 65 | !(sk1_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) |
7016e062 | 66 | return true; |
fe38d2a1 JB |
67 | |
68 | if (sk2_rcv_saddr6 && | |
637bc8bb | 69 | ipv6_addr_equal(sk1_rcv_saddr6, sk2_rcv_saddr6)) |
7016e062 | 70 | return true; |
fe38d2a1 | 71 | |
7016e062 | 72 | return false; |
fe38d2a1 JB |
73 | } |
74 | #endif | |
75 | ||
76 | /* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses | |
77 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
78 | * 0.0.0.0 only equals to 0.0.0.0 | |
79 | */ | |
7016e062 JP |
80 | static bool ipv4_rcv_saddr_equal(__be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr, |
81 | bool sk2_ipv6only, bool match_wildcard) | |
fe38d2a1 | 82 | { |
637bc8bb JB |
83 | if (!sk2_ipv6only) { |
84 | if (sk1_rcv_saddr == sk2_rcv_saddr) | |
7016e062 | 85 | return true; |
637bc8bb | 86 | if (!sk1_rcv_saddr || !sk2_rcv_saddr) |
fe38d2a1 JB |
87 | return match_wildcard; |
88 | } | |
7016e062 | 89 | return false; |
fe38d2a1 JB |
90 | } |
91 | ||
7016e062 JP |
92 | bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, |
93 | bool match_wildcard) | |
fe38d2a1 JB |
94 | { |
95 | #if IS_ENABLED(CONFIG_IPV6) | |
96 | if (sk->sk_family == AF_INET6) | |
637bc8bb | 97 | return ipv6_rcv_saddr_equal(&sk->sk_v6_rcv_saddr, |
319554f2 | 98 | inet6_rcv_saddr(sk2), |
637bc8bb JB |
99 | sk->sk_rcv_saddr, |
100 | sk2->sk_rcv_saddr, | |
101 | ipv6_only_sock(sk), | |
102 | ipv6_only_sock(sk2), | |
103 | match_wildcard); | |
fe38d2a1 | 104 | #endif |
637bc8bb JB |
105 | return ipv4_rcv_saddr_equal(sk->sk_rcv_saddr, sk2->sk_rcv_saddr, |
106 | ipv6_only_sock(sk2), match_wildcard); | |
fe38d2a1 JB |
107 | } |
108 | EXPORT_SYMBOL(inet_rcv_saddr_equal); | |
109 | ||
2dbb9b9e MKL |
110 | bool inet_rcv_saddr_any(const struct sock *sk) |
111 | { | |
112 | #if IS_ENABLED(CONFIG_IPV6) | |
113 | if (sk->sk_family == AF_INET6) | |
114 | return ipv6_addr_any(&sk->sk_v6_rcv_saddr); | |
115 | #endif | |
116 | return !sk->sk_rcv_saddr; | |
117 | } | |
118 | ||
0bbf87d8 | 119 | void inet_get_local_port_range(struct net *net, int *low, int *high) |
227b60f5 | 120 | { |
95c96174 ED |
121 | unsigned int seq; |
122 | ||
227b60f5 | 123 | do { |
c9d8f1a6 | 124 | seq = read_seqbegin(&net->ipv4.ip_local_ports.lock); |
227b60f5 | 125 | |
c9d8f1a6 CW |
126 | *low = net->ipv4.ip_local_ports.range[0]; |
127 | *high = net->ipv4.ip_local_ports.range[1]; | |
128 | } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq)); | |
227b60f5 SH |
129 | } |
130 | EXPORT_SYMBOL(inet_get_local_port_range); | |
3f421baa | 131 | |
aa078842 JB |
132 | static int inet_csk_bind_conflict(const struct sock *sk, |
133 | const struct inet_bind_bucket *tb, | |
134 | bool relax, bool reuseport_ok) | |
3f421baa | 135 | { |
3f421baa | 136 | struct sock *sk2; |
0643ee4f TH |
137 | bool reuse = sk->sk_reuse; |
138 | bool reuseport = !!sk->sk_reuseport && reuseport_ok; | |
da5e3630 | 139 | kuid_t uid = sock_i_uid((struct sock *)sk); |
3f421baa | 140 | |
7477fd2e PE |
141 | /* |
142 | * Unlike other sk lookup places we do not check | |
143 | * for sk_net here, since _all_ the socks listed | |
144 | * in tb->owners list belong to the same net - the | |
145 | * one this bucket belongs to. | |
146 | */ | |
147 | ||
b67bfe0d | 148 | sk_for_each_bound(sk2, &tb->owners) { |
3f421baa | 149 | if (sk != sk2 && |
3f421baa ACM |
150 | (!sk->sk_bound_dev_if || |
151 | !sk2->sk_bound_dev_if || | |
152 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { | |
da5e3630 TH |
153 | if ((!reuse || !sk2->sk_reuse || |
154 | sk2->sk_state == TCP_LISTEN) && | |
155 | (!reuseport || !sk2->sk_reuseport || | |
c125e80b CG |
156 | rcu_access_pointer(sk->sk_reuseport_cb) || |
157 | (sk2->sk_state != TCP_TIME_WAIT && | |
da5e3630 | 158 | !uid_eq(uid, sock_i_uid(sk2))))) { |
aa078842 | 159 | if (inet_rcv_saddr_equal(sk, sk2, true)) |
3f421baa | 160 | break; |
8d238b25 | 161 | } |
aacd9289 AC |
162 | if (!relax && reuse && sk2->sk_reuse && |
163 | sk2->sk_state != TCP_LISTEN) { | |
aa078842 | 164 | if (inet_rcv_saddr_equal(sk, sk2, true)) |
aacd9289 AC |
165 | break; |
166 | } | |
3f421baa ACM |
167 | } |
168 | } | |
b67bfe0d | 169 | return sk2 != NULL; |
3f421baa | 170 | } |
971af18b | 171 | |
289141b7 JB |
172 | /* |
173 | * Find an open port number for the socket. Returns with the | |
174 | * inet_bind_hashbucket lock held. | |
3f421baa | 175 | */ |
289141b7 JB |
176 | static struct inet_bind_hashbucket * |
177 | inet_csk_find_open_port(struct sock *sk, struct inet_bind_bucket **tb_ret, int *port_ret) | |
3f421baa | 178 | { |
ea8add2b | 179 | struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo; |
289141b7 | 180 | int port = 0; |
3f421baa | 181 | struct inet_bind_hashbucket *head; |
3b1e0a65 | 182 | struct net *net = sock_net(sk); |
ea8add2b ED |
183 | int i, low, high, attempt_half; |
184 | struct inet_bind_bucket *tb; | |
ea8add2b | 185 | u32 remaining, offset; |
3c82a21f | 186 | int l3mdev; |
3f421baa | 187 | |
3c82a21f | 188 | l3mdev = inet_sk_bound_l3mdev(sk); |
ea8add2b ED |
189 | attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0; |
190 | other_half_scan: | |
191 | inet_get_local_port_range(net, &low, &high); | |
192 | high++; /* [32768, 60999] -> [32768, 61000[ */ | |
193 | if (high - low < 4) | |
194 | attempt_half = 0; | |
195 | if (attempt_half) { | |
196 | int half = low + (((high - low) >> 2) << 1); | |
197 | ||
198 | if (attempt_half == 1) | |
199 | high = half; | |
200 | else | |
201 | low = half; | |
202 | } | |
203 | remaining = high - low; | |
204 | if (likely(remaining > 1)) | |
205 | remaining &= ~1U; | |
3f421baa | 206 | |
ea8add2b ED |
207 | offset = prandom_u32() % remaining; |
208 | /* __inet_hash_connect() favors ports having @low parity | |
209 | * We do the opposite to not pollute connect() users. | |
210 | */ | |
211 | offset |= 1U; | |
ea8add2b ED |
212 | |
213 | other_parity_scan: | |
214 | port = low + offset; | |
215 | for (i = 0; i < remaining; i += 2, port += 2) { | |
216 | if (unlikely(port >= high)) | |
217 | port -= remaining; | |
218 | if (inet_is_local_reserved_port(net, port)) | |
219 | continue; | |
220 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
221 | hinfo->bhash_size)]; | |
222 | spin_lock_bh(&head->lock); | |
223 | inet_bind_bucket_for_each(tb, &head->chain) | |
3c82a21f RS |
224 | if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev && |
225 | tb->port == port) { | |
289141b7 | 226 | if (!inet_csk_bind_conflict(sk, tb, false, false)) |
6cd66616 | 227 | goto success; |
ea8add2b | 228 | goto next_port; |
946f9eb2 | 229 | } |
289141b7 JB |
230 | tb = NULL; |
231 | goto success; | |
ea8add2b ED |
232 | next_port: |
233 | spin_unlock_bh(&head->lock); | |
234 | cond_resched(); | |
235 | } | |
236 | ||
ea8add2b ED |
237 | offset--; |
238 | if (!(offset & 1)) | |
239 | goto other_parity_scan; | |
240 | ||
241 | if (attempt_half == 1) { | |
242 | /* OK we now try the upper half of the range */ | |
243 | attempt_half = 2; | |
244 | goto other_half_scan; | |
245 | } | |
289141b7 JB |
246 | return NULL; |
247 | success: | |
248 | *port_ret = port; | |
249 | *tb_ret = tb; | |
250 | return head; | |
251 | } | |
ea8add2b | 252 | |
637bc8bb JB |
253 | static inline int sk_reuseport_match(struct inet_bind_bucket *tb, |
254 | struct sock *sk) | |
255 | { | |
256 | kuid_t uid = sock_i_uid(sk); | |
257 | ||
258 | if (tb->fastreuseport <= 0) | |
259 | return 0; | |
260 | if (!sk->sk_reuseport) | |
261 | return 0; | |
262 | if (rcu_access_pointer(sk->sk_reuseport_cb)) | |
263 | return 0; | |
264 | if (!uid_eq(tb->fastuid, uid)) | |
265 | return 0; | |
266 | /* We only need to check the rcv_saddr if this tb was once marked | |
267 | * without fastreuseport and then was reset, as we can only know that | |
268 | * the fast_*rcv_saddr doesn't have any conflicts with the socks on the | |
269 | * owners list. | |
270 | */ | |
271 | if (tb->fastreuseport == FASTREUSEPORT_ANY) | |
272 | return 1; | |
273 | #if IS_ENABLED(CONFIG_IPV6) | |
274 | if (tb->fast_sk_family == AF_INET6) | |
275 | return ipv6_rcv_saddr_equal(&tb->fast_v6_rcv_saddr, | |
7a56673b | 276 | inet6_rcv_saddr(sk), |
637bc8bb JB |
277 | tb->fast_rcv_saddr, |
278 | sk->sk_rcv_saddr, | |
279 | tb->fast_ipv6_only, | |
280 | ipv6_only_sock(sk), true); | |
281 | #endif | |
282 | return ipv4_rcv_saddr_equal(tb->fast_rcv_saddr, sk->sk_rcv_saddr, | |
283 | ipv6_only_sock(sk), true); | |
284 | } | |
285 | ||
289141b7 JB |
286 | /* Obtain a reference to a local port for the given sock, |
287 | * if snum is zero it means select any available local port. | |
288 | * We try to allocate an odd port (and leave even ports for connect()) | |
289 | */ | |
290 | int inet_csk_get_port(struct sock *sk, unsigned short snum) | |
291 | { | |
292 | bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN; | |
293 | struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo; | |
294 | int ret = 1, port = snum; | |
295 | struct inet_bind_hashbucket *head; | |
296 | struct net *net = sock_net(sk); | |
297 | struct inet_bind_bucket *tb = NULL; | |
298 | kuid_t uid = sock_i_uid(sk); | |
3c82a21f RS |
299 | int l3mdev; |
300 | ||
301 | l3mdev = inet_sk_bound_l3mdev(sk); | |
289141b7 JB |
302 | |
303 | if (!port) { | |
304 | head = inet_csk_find_open_port(sk, &tb, &port); | |
305 | if (!head) | |
306 | return ret; | |
307 | if (!tb) | |
308 | goto tb_not_found; | |
309 | goto success; | |
310 | } | |
311 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
312 | hinfo->bhash_size)]; | |
313 | spin_lock_bh(&head->lock); | |
314 | inet_bind_bucket_for_each(tb, &head->chain) | |
3c82a21f RS |
315 | if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev && |
316 | tb->port == port) | |
289141b7 | 317 | goto tb_found; |
ea8add2b ED |
318 | tb_not_found: |
319 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, | |
3c82a21f | 320 | net, head, port, l3mdev); |
ea8add2b ED |
321 | if (!tb) |
322 | goto fail_unlock; | |
3f421baa ACM |
323 | tb_found: |
324 | if (!hlist_empty(&tb->owners)) { | |
4a17fd52 PE |
325 | if (sk->sk_reuse == SK_FORCE_REUSE) |
326 | goto success; | |
327 | ||
b9470c27 | 328 | if ((tb->fastreuse > 0 && reuse) || |
637bc8bb | 329 | sk_reuseport_match(tb, sk)) |
3f421baa | 330 | goto success; |
289141b7 | 331 | if (inet_csk_bind_conflict(sk, tb, true, true)) |
ea8add2b | 332 | goto fail_unlock; |
6cd66616 JB |
333 | } |
334 | success: | |
fbed24bc | 335 | if (hlist_empty(&tb->owners)) { |
ea8add2b | 336 | tb->fastreuse = reuse; |
da5e3630 | 337 | if (sk->sk_reuseport) { |
637bc8bb | 338 | tb->fastreuseport = FASTREUSEPORT_ANY; |
da5e3630 | 339 | tb->fastuid = uid; |
637bc8bb JB |
340 | tb->fast_rcv_saddr = sk->sk_rcv_saddr; |
341 | tb->fast_ipv6_only = ipv6_only_sock(sk); | |
cbb2fb5c | 342 | tb->fast_sk_family = sk->sk_family; |
637bc8bb JB |
343 | #if IS_ENABLED(CONFIG_IPV6) |
344 | tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr; | |
345 | #endif | |
ea8add2b | 346 | } else { |
da5e3630 | 347 | tb->fastreuseport = 0; |
ea8add2b | 348 | } |
6cd66616 JB |
349 | } else { |
350 | if (!reuse) | |
351 | tb->fastreuse = 0; | |
637bc8bb JB |
352 | if (sk->sk_reuseport) { |
353 | /* We didn't match or we don't have fastreuseport set on | |
354 | * the tb, but we have sk_reuseport set on this socket | |
355 | * and we know that there are no bind conflicts with | |
356 | * this socket in this tb, so reset our tb's reuseport | |
357 | * settings so that any subsequent sockets that match | |
358 | * our current socket will be put on the fast path. | |
359 | * | |
360 | * If we reset we need to set FASTREUSEPORT_STRICT so we | |
361 | * do extra checking for all subsequent sk_reuseport | |
362 | * socks. | |
363 | */ | |
364 | if (!sk_reuseport_match(tb, sk)) { | |
365 | tb->fastreuseport = FASTREUSEPORT_STRICT; | |
366 | tb->fastuid = uid; | |
367 | tb->fast_rcv_saddr = sk->sk_rcv_saddr; | |
368 | tb->fast_ipv6_only = ipv6_only_sock(sk); | |
cbb2fb5c | 369 | tb->fast_sk_family = sk->sk_family; |
637bc8bb JB |
370 | #if IS_ENABLED(CONFIG_IPV6) |
371 | tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr; | |
372 | #endif | |
373 | } | |
374 | } else { | |
6cd66616 | 375 | tb->fastreuseport = 0; |
637bc8bb | 376 | } |
da5e3630 | 377 | } |
3f421baa | 378 | if (!inet_csk(sk)->icsk_bind_hash) |
ea8add2b | 379 | inet_bind_hash(sk, tb, port); |
547b792c | 380 | WARN_ON(inet_csk(sk)->icsk_bind_hash != tb); |
e905a9ed | 381 | ret = 0; |
3f421baa ACM |
382 | |
383 | fail_unlock: | |
ea8add2b | 384 | spin_unlock_bh(&head->lock); |
3f421baa ACM |
385 | return ret; |
386 | } | |
3f421baa ACM |
387 | EXPORT_SYMBOL_GPL(inet_csk_get_port); |
388 | ||
389 | /* | |
390 | * Wait for an incoming connection, avoid race conditions. This must be called | |
391 | * with the socket locked. | |
392 | */ | |
393 | static int inet_csk_wait_for_connect(struct sock *sk, long timeo) | |
394 | { | |
395 | struct inet_connection_sock *icsk = inet_csk(sk); | |
396 | DEFINE_WAIT(wait); | |
397 | int err; | |
398 | ||
399 | /* | |
400 | * True wake-one mechanism for incoming connections: only | |
401 | * one process gets woken up, not the 'whole herd'. | |
402 | * Since we do not 'race & poll' for established sockets | |
403 | * anymore, the common case will execute the loop only once. | |
404 | * | |
405 | * Subtle issue: "add_wait_queue_exclusive()" will be added | |
406 | * after any current non-exclusive waiters, and we know that | |
407 | * it will always _stay_ after any new non-exclusive waiters | |
408 | * because all non-exclusive waiters are added at the | |
409 | * beginning of the wait-queue. As such, it's ok to "drop" | |
410 | * our exclusiveness temporarily when we get woken up without | |
411 | * having to remove and re-insert us on the wait queue. | |
412 | */ | |
413 | for (;;) { | |
aa395145 | 414 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
3f421baa ACM |
415 | TASK_INTERRUPTIBLE); |
416 | release_sock(sk); | |
417 | if (reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
418 | timeo = schedule_timeout(timeo); | |
cb7cf8a3 | 419 | sched_annotate_sleep(); |
3f421baa ACM |
420 | lock_sock(sk); |
421 | err = 0; | |
422 | if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
423 | break; | |
424 | err = -EINVAL; | |
425 | if (sk->sk_state != TCP_LISTEN) | |
426 | break; | |
427 | err = sock_intr_errno(timeo); | |
428 | if (signal_pending(current)) | |
429 | break; | |
430 | err = -EAGAIN; | |
431 | if (!timeo) | |
432 | break; | |
433 | } | |
aa395145 | 434 | finish_wait(sk_sleep(sk), &wait); |
3f421baa ACM |
435 | return err; |
436 | } | |
437 | ||
438 | /* | |
439 | * This will accept the next outstanding connection. | |
440 | */ | |
cdfbabfb | 441 | struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern) |
3f421baa ACM |
442 | { |
443 | struct inet_connection_sock *icsk = inet_csk(sk); | |
8336886f | 444 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
8336886f | 445 | struct request_sock *req; |
e3d95ad7 | 446 | struct sock *newsk; |
3f421baa ACM |
447 | int error; |
448 | ||
449 | lock_sock(sk); | |
450 | ||
451 | /* We need to make sure that this socket is listening, | |
452 | * and that it has something pending. | |
453 | */ | |
454 | error = -EINVAL; | |
455 | if (sk->sk_state != TCP_LISTEN) | |
456 | goto out_err; | |
457 | ||
458 | /* Find already established connection */ | |
8336886f | 459 | if (reqsk_queue_empty(queue)) { |
3f421baa ACM |
460 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
461 | ||
462 | /* If this is a non blocking socket don't sleep */ | |
463 | error = -EAGAIN; | |
464 | if (!timeo) | |
465 | goto out_err; | |
466 | ||
467 | error = inet_csk_wait_for_connect(sk, timeo); | |
468 | if (error) | |
469 | goto out_err; | |
470 | } | |
fff1f300 | 471 | req = reqsk_queue_remove(queue, sk); |
8336886f JC |
472 | newsk = req->sk; |
473 | ||
e3d95ad7 | 474 | if (sk->sk_protocol == IPPROTO_TCP && |
0536fcc0 ED |
475 | tcp_rsk(req)->tfo_listener) { |
476 | spin_lock_bh(&queue->fastopenq.lock); | |
9439ce00 | 477 | if (tcp_rsk(req)->tfo_listener) { |
8336886f JC |
478 | /* We are still waiting for the final ACK from 3WHS |
479 | * so can't free req now. Instead, we set req->sk to | |
480 | * NULL to signify that the child socket is taken | |
481 | * so reqsk_fastopen_remove() will free the req | |
482 | * when 3WHS finishes (or is aborted). | |
483 | */ | |
484 | req->sk = NULL; | |
485 | req = NULL; | |
486 | } | |
0536fcc0 | 487 | spin_unlock_bh(&queue->fastopenq.lock); |
8336886f | 488 | } |
3f421baa ACM |
489 | out: |
490 | release_sock(sk); | |
8336886f | 491 | if (req) |
13854e5a | 492 | reqsk_put(req); |
3f421baa ACM |
493 | return newsk; |
494 | out_err: | |
495 | newsk = NULL; | |
8336886f | 496 | req = NULL; |
3f421baa ACM |
497 | *err = error; |
498 | goto out; | |
499 | } | |
3f421baa ACM |
500 | EXPORT_SYMBOL(inet_csk_accept); |
501 | ||
502 | /* | |
503 | * Using different timers for retransmit, delayed acks and probes | |
e905a9ed | 504 | * We may wish use just one timer maintaining a list of expire jiffies |
3f421baa ACM |
505 | * to optimize. |
506 | */ | |
507 | void inet_csk_init_xmit_timers(struct sock *sk, | |
59f379f9 KC |
508 | void (*retransmit_handler)(struct timer_list *t), |
509 | void (*delack_handler)(struct timer_list *t), | |
510 | void (*keepalive_handler)(struct timer_list *t)) | |
3f421baa ACM |
511 | { |
512 | struct inet_connection_sock *icsk = inet_csk(sk); | |
513 | ||
59f379f9 KC |
514 | timer_setup(&icsk->icsk_retransmit_timer, retransmit_handler, 0); |
515 | timer_setup(&icsk->icsk_delack_timer, delack_handler, 0); | |
516 | timer_setup(&sk->sk_timer, keepalive_handler, 0); | |
3f421baa ACM |
517 | icsk->icsk_pending = icsk->icsk_ack.pending = 0; |
518 | } | |
3f421baa ACM |
519 | EXPORT_SYMBOL(inet_csk_init_xmit_timers); |
520 | ||
521 | void inet_csk_clear_xmit_timers(struct sock *sk) | |
522 | { | |
523 | struct inet_connection_sock *icsk = inet_csk(sk); | |
524 | ||
525 | icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; | |
526 | ||
527 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
528 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
529 | sk_stop_timer(sk, &sk->sk_timer); | |
530 | } | |
3f421baa ACM |
531 | EXPORT_SYMBOL(inet_csk_clear_xmit_timers); |
532 | ||
533 | void inet_csk_delete_keepalive_timer(struct sock *sk) | |
534 | { | |
535 | sk_stop_timer(sk, &sk->sk_timer); | |
536 | } | |
3f421baa ACM |
537 | EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); |
538 | ||
539 | void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) | |
540 | { | |
541 | sk_reset_timer(sk, &sk->sk_timer, jiffies + len); | |
542 | } | |
3f421baa ACM |
543 | EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); |
544 | ||
e5895bc6 | 545 | struct dst_entry *inet_csk_route_req(const struct sock *sk, |
6bd023f3 | 546 | struct flowi4 *fl4, |
ba3f7f04 | 547 | const struct request_sock *req) |
3f421baa | 548 | { |
3f421baa | 549 | const struct inet_request_sock *ireq = inet_rsk(req); |
8b929ab1 | 550 | struct net *net = read_pnet(&ireq->ireq_net); |
c92e8c02 | 551 | struct ip_options_rcu *opt; |
8b929ab1 | 552 | struct rtable *rt; |
3f421baa | 553 | |
2ab2ddd3 ED |
554 | rcu_read_lock(); |
555 | opt = rcu_dereference(ireq->ireq_opt); | |
06f877d6 | 556 | |
8b929ab1 | 557 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
e79d9bc7 | 558 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
8b929ab1 | 559 | sk->sk_protocol, inet_sk_flowi_flags(sk), |
634fb979 | 560 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
8b929ab1 | 561 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
e2d118a1 | 562 | htons(ireq->ir_num), sk->sk_uid); |
6bd023f3 DM |
563 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
564 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe | 565 | if (IS_ERR(rt)) |
857a6e0a | 566 | goto no_route; |
1550c171 | 567 | if (opt && opt->opt.is_strictroute && rt->rt_gw_family) |
857a6e0a | 568 | goto route_err; |
2ab2ddd3 | 569 | rcu_read_unlock(); |
d8d1f30b | 570 | return &rt->dst; |
857a6e0a IJ |
571 | |
572 | route_err: | |
573 | ip_rt_put(rt); | |
574 | no_route: | |
2ab2ddd3 | 575 | rcu_read_unlock(); |
b45386ef | 576 | __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
857a6e0a | 577 | return NULL; |
3f421baa | 578 | } |
3f421baa ACM |
579 | EXPORT_SYMBOL_GPL(inet_csk_route_req); |
580 | ||
a2432c4f | 581 | struct dst_entry *inet_csk_route_child_sock(const struct sock *sk, |
77357a95 DM |
582 | struct sock *newsk, |
583 | const struct request_sock *req) | |
584 | { | |
585 | const struct inet_request_sock *ireq = inet_rsk(req); | |
8b929ab1 | 586 | struct net *net = read_pnet(&ireq->ireq_net); |
77357a95 | 587 | struct inet_sock *newinet = inet_sk(newsk); |
1a7b27c9 | 588 | struct ip_options_rcu *opt; |
77357a95 DM |
589 | struct flowi4 *fl4; |
590 | struct rtable *rt; | |
591 | ||
c92e8c02 | 592 | opt = rcu_dereference(ireq->ireq_opt); |
77357a95 | 593 | fl4 = &newinet->cork.fl.u.ip4; |
1a7b27c9 | 594 | |
8b929ab1 | 595 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
77357a95 DM |
596 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
597 | sk->sk_protocol, inet_sk_flowi_flags(sk), | |
634fb979 | 598 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
8b929ab1 | 599 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
e2d118a1 | 600 | htons(ireq->ir_num), sk->sk_uid); |
77357a95 DM |
601 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
602 | rt = ip_route_output_flow(net, fl4, sk); | |
603 | if (IS_ERR(rt)) | |
604 | goto no_route; | |
1550c171 | 605 | if (opt && opt->opt.is_strictroute && rt->rt_gw_family) |
77357a95 DM |
606 | goto route_err; |
607 | return &rt->dst; | |
608 | ||
609 | route_err: | |
610 | ip_rt_put(rt); | |
611 | no_route: | |
b45386ef | 612 | __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
77357a95 DM |
613 | return NULL; |
614 | } | |
615 | EXPORT_SYMBOL_GPL(inet_csk_route_child_sock); | |
616 | ||
dfd56b8b | 617 | #if IS_ENABLED(CONFIG_IPV6) |
3f421baa ACM |
618 | #define AF_INET_FAMILY(fam) ((fam) == AF_INET) |
619 | #else | |
fa76ce73 | 620 | #define AF_INET_FAMILY(fam) true |
3f421baa ACM |
621 | #endif |
622 | ||
0c3d79bc JA |
623 | /* Decide when to expire the request and when to resend SYN-ACK */ |
624 | static inline void syn_ack_recalc(struct request_sock *req, const int thresh, | |
625 | const int max_retries, | |
626 | const u8 rskq_defer_accept, | |
627 | int *expire, int *resend) | |
628 | { | |
629 | if (!rskq_defer_accept) { | |
e6c022a4 | 630 | *expire = req->num_timeout >= thresh; |
0c3d79bc JA |
631 | *resend = 1; |
632 | return; | |
633 | } | |
e6c022a4 ED |
634 | *expire = req->num_timeout >= thresh && |
635 | (!inet_rsk(req)->acked || req->num_timeout >= max_retries); | |
0c3d79bc JA |
636 | /* |
637 | * Do not resend while waiting for data after ACK, | |
638 | * start to resend on end of deferring period to give | |
639 | * last chance for data or ACK to create established socket. | |
640 | */ | |
641 | *resend = !inet_rsk(req)->acked || | |
e6c022a4 | 642 | req->num_timeout >= rskq_defer_accept - 1; |
0c3d79bc JA |
643 | } |
644 | ||
1b70e977 | 645 | int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req) |
e6c022a4 | 646 | { |
1a2c6181 | 647 | int err = req->rsk_ops->rtx_syn_ack(parent, req); |
e6c022a4 ED |
648 | |
649 | if (!err) | |
650 | req->num_retrans++; | |
651 | return err; | |
652 | } | |
653 | EXPORT_SYMBOL(inet_rtx_syn_ack); | |
654 | ||
079096f1 | 655 | /* return true if req was found in the ehash table */ |
b357a364 ED |
656 | static bool reqsk_queue_unlink(struct request_sock_queue *queue, |
657 | struct request_sock *req) | |
658 | { | |
079096f1 | 659 | struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo; |
5e0724d0 | 660 | bool found = false; |
b357a364 | 661 | |
5e0724d0 ED |
662 | if (sk_hashed(req_to_sk(req))) { |
663 | spinlock_t *lock = inet_ehash_lockp(hashinfo, req->rsk_hash); | |
b357a364 | 664 | |
5e0724d0 ED |
665 | spin_lock(lock); |
666 | found = __sk_nulls_del_node_init_rcu(req_to_sk(req)); | |
667 | spin_unlock(lock); | |
668 | } | |
83fccfc3 | 669 | if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer)) |
b357a364 ED |
670 | reqsk_put(req); |
671 | return found; | |
672 | } | |
673 | ||
674 | void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req) | |
675 | { | |
676 | if (reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req)) { | |
677 | reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req); | |
678 | reqsk_put(req); | |
679 | } | |
680 | } | |
681 | EXPORT_SYMBOL(inet_csk_reqsk_queue_drop); | |
682 | ||
f03f2e15 ED |
683 | void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req) |
684 | { | |
685 | inet_csk_reqsk_queue_drop(sk, req); | |
686 | reqsk_put(req); | |
687 | } | |
688 | EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put); | |
689 | ||
59f379f9 | 690 | static void reqsk_timer_handler(struct timer_list *t) |
a019d6fe | 691 | { |
59f379f9 | 692 | struct request_sock *req = from_timer(req, t, rsk_timer); |
fa76ce73 | 693 | struct sock *sk_listener = req->rsk_listener; |
7c083ecb | 694 | struct net *net = sock_net(sk_listener); |
fa76ce73 | 695 | struct inet_connection_sock *icsk = inet_csk(sk_listener); |
a019d6fe | 696 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
2b41fab7 | 697 | int qlen, expire = 0, resend = 0; |
fa76ce73 | 698 | int max_retries, thresh; |
2b41fab7 | 699 | u8 defer_accept; |
a019d6fe | 700 | |
986ffdfd | 701 | if (inet_sk_state_load(sk_listener) != TCP_LISTEN) |
079096f1 | 702 | goto drop; |
a019d6fe | 703 | |
7c083ecb | 704 | max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries; |
fa76ce73 | 705 | thresh = max_retries; |
a019d6fe ACM |
706 | /* Normally all the openreqs are young and become mature |
707 | * (i.e. converted to established socket) for first timeout. | |
fd4f2cea | 708 | * If synack was not acknowledged for 1 second, it means |
a019d6fe ACM |
709 | * one of the following things: synack was lost, ack was lost, |
710 | * rtt is high or nobody planned to ack (i.e. synflood). | |
711 | * When server is a bit loaded, queue is populated with old | |
712 | * open requests, reducing effective size of queue. | |
713 | * When server is well loaded, queue size reduces to zero | |
714 | * after several minutes of work. It is not synflood, | |
715 | * it is normal operation. The solution is pruning | |
716 | * too old entries overriding normal timeout, when | |
717 | * situation becomes dangerous. | |
718 | * | |
719 | * Essentially, we reserve half of room for young | |
720 | * embrions; and abort old ones without pity, if old | |
721 | * ones are about to clog our table. | |
722 | */ | |
aac065c5 | 723 | qlen = reqsk_queue_len(queue); |
acb4a6bf | 724 | if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) { |
aac065c5 | 725 | int young = reqsk_queue_len_young(queue) << 1; |
a019d6fe ACM |
726 | |
727 | while (thresh > 2) { | |
2b41fab7 | 728 | if (qlen < young) |
a019d6fe ACM |
729 | break; |
730 | thresh--; | |
731 | young <<= 1; | |
732 | } | |
733 | } | |
2b41fab7 ED |
734 | defer_accept = READ_ONCE(queue->rskq_defer_accept); |
735 | if (defer_accept) | |
736 | max_retries = defer_accept; | |
737 | syn_ack_recalc(req, thresh, max_retries, defer_accept, | |
fa76ce73 | 738 | &expire, &resend); |
42cb80a2 | 739 | req->rsk_ops->syn_ack_timeout(req); |
fa76ce73 ED |
740 | if (!expire && |
741 | (!resend || | |
742 | !inet_rtx_syn_ack(sk_listener, req) || | |
743 | inet_rsk(req)->acked)) { | |
744 | unsigned long timeo; | |
745 | ||
746 | if (req->num_timeout++ == 0) | |
aac065c5 | 747 | atomic_dec(&queue->young); |
fa76ce73 | 748 | timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); |
f3438bc7 | 749 | mod_timer(&req->rsk_timer, jiffies + timeo); |
fa76ce73 ED |
750 | return; |
751 | } | |
079096f1 | 752 | drop: |
f03f2e15 | 753 | inet_csk_reqsk_queue_drop_and_put(sk_listener, req); |
fa76ce73 | 754 | } |
ec0a1966 | 755 | |
079096f1 ED |
756 | static void reqsk_queue_hash_req(struct request_sock *req, |
757 | unsigned long timeout) | |
fa76ce73 | 758 | { |
fa76ce73 ED |
759 | req->num_retrans = 0; |
760 | req->num_timeout = 0; | |
761 | req->sk = NULL; | |
a019d6fe | 762 | |
59f379f9 | 763 | timer_setup(&req->rsk_timer, reqsk_timer_handler, TIMER_PINNED); |
f3438bc7 | 764 | mod_timer(&req->rsk_timer, jiffies + timeout); |
29c68526 | 765 | |
079096f1 | 766 | inet_ehash_insert(req_to_sk(req), NULL); |
fa76ce73 ED |
767 | /* before letting lookups find us, make sure all req fields |
768 | * are committed to memory and refcnt initialized. | |
769 | */ | |
770 | smp_wmb(); | |
41c6d650 | 771 | refcount_set(&req->rsk_refcnt, 2 + 1); |
079096f1 | 772 | } |
a019d6fe | 773 | |
079096f1 ED |
774 | void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, |
775 | unsigned long timeout) | |
776 | { | |
777 | reqsk_queue_hash_req(req, timeout); | |
778 | inet_csk_reqsk_queue_added(sk); | |
a019d6fe | 779 | } |
079096f1 | 780 | EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); |
a019d6fe | 781 | |
e56c57d0 ED |
782 | /** |
783 | * inet_csk_clone_lock - clone an inet socket, and lock its clone | |
784 | * @sk: the socket to clone | |
785 | * @req: request_sock | |
786 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
787 | * | |
788 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
789 | */ | |
790 | struct sock *inet_csk_clone_lock(const struct sock *sk, | |
791 | const struct request_sock *req, | |
792 | const gfp_t priority) | |
9f1d2604 | 793 | { |
e56c57d0 | 794 | struct sock *newsk = sk_clone_lock(sk, priority); |
9f1d2604 | 795 | |
00db4124 | 796 | if (newsk) { |
9f1d2604 ACM |
797 | struct inet_connection_sock *newicsk = inet_csk(newsk); |
798 | ||
563e0bb0 | 799 | inet_sk_set_state(newsk, TCP_SYN_RECV); |
9f1d2604 ACM |
800 | newicsk->icsk_bind_hash = NULL; |
801 | ||
634fb979 | 802 | inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port; |
b44084c2 ED |
803 | inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num; |
804 | inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num); | |
9f1d2604 | 805 | |
85017869 ED |
806 | /* listeners have SOCK_RCU_FREE, not the children */ |
807 | sock_reset_flag(newsk, SOCK_RCU_FREE); | |
808 | ||
657831ff ED |
809 | inet_sk(newsk)->mc_list = NULL; |
810 | ||
84f39b08 | 811 | newsk->sk_mark = inet_rsk(req)->ir_mark; |
33cf7c90 ED |
812 | atomic64_set(&newsk->sk_cookie, |
813 | atomic64_read(&inet_rsk(req)->ir_cookie)); | |
84f39b08 | 814 | |
9f1d2604 | 815 | newicsk->icsk_retransmits = 0; |
6687e988 ACM |
816 | newicsk->icsk_backoff = 0; |
817 | newicsk->icsk_probes_out = 0; | |
9f1d2604 ACM |
818 | |
819 | /* Deinitialize accept_queue to trap illegal accesses. */ | |
820 | memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); | |
4237c75c VY |
821 | |
822 | security_inet_csk_clone(newsk, req); | |
9f1d2604 ACM |
823 | } |
824 | return newsk; | |
825 | } | |
e56c57d0 | 826 | EXPORT_SYMBOL_GPL(inet_csk_clone_lock); |
a019d6fe ACM |
827 | |
828 | /* | |
829 | * At this point, there should be no process reference to this | |
830 | * socket, and thus no user references at all. Therefore we | |
831 | * can assume the socket waitqueue is inactive and nobody will | |
832 | * try to jump onto it. | |
833 | */ | |
834 | void inet_csk_destroy_sock(struct sock *sk) | |
835 | { | |
547b792c IJ |
836 | WARN_ON(sk->sk_state != TCP_CLOSE); |
837 | WARN_ON(!sock_flag(sk, SOCK_DEAD)); | |
a019d6fe ACM |
838 | |
839 | /* It cannot be in hash table! */ | |
547b792c | 840 | WARN_ON(!sk_unhashed(sk)); |
a019d6fe | 841 | |
c720c7e8 ED |
842 | /* If it has not 0 inet_sk(sk)->inet_num, it must be bound */ |
843 | WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash); | |
a019d6fe ACM |
844 | |
845 | sk->sk_prot->destroy(sk); | |
846 | ||
847 | sk_stream_kill_queues(sk); | |
848 | ||
849 | xfrm_sk_free_policy(sk); | |
850 | ||
851 | sk_refcnt_debug_release(sk); | |
852 | ||
dd24c001 | 853 | percpu_counter_dec(sk->sk_prot->orphan_count); |
c2a2efbb | 854 | |
a019d6fe ACM |
855 | sock_put(sk); |
856 | } | |
a019d6fe ACM |
857 | EXPORT_SYMBOL(inet_csk_destroy_sock); |
858 | ||
e337e24d CP |
859 | /* This function allows to force a closure of a socket after the call to |
860 | * tcp/dccp_create_openreq_child(). | |
861 | */ | |
862 | void inet_csk_prepare_forced_close(struct sock *sk) | |
c10cb5fc | 863 | __releases(&sk->sk_lock.slock) |
e337e24d CP |
864 | { |
865 | /* sk_clone_lock locked the socket and set refcnt to 2 */ | |
866 | bh_unlock_sock(sk); | |
867 | sock_put(sk); | |
868 | ||
869 | /* The below has to be done to allow calling inet_csk_destroy_sock */ | |
870 | sock_set_flag(sk, SOCK_DEAD); | |
871 | percpu_counter_inc(sk->sk_prot->orphan_count); | |
872 | inet_sk(sk)->inet_num = 0; | |
873 | } | |
874 | EXPORT_SYMBOL(inet_csk_prepare_forced_close); | |
875 | ||
f985c65c | 876 | int inet_csk_listen_start(struct sock *sk, int backlog) |
a019d6fe | 877 | { |
a019d6fe | 878 | struct inet_connection_sock *icsk = inet_csk(sk); |
10cbc8f1 | 879 | struct inet_sock *inet = inet_sk(sk); |
086c653f | 880 | int err = -EADDRINUSE; |
a019d6fe | 881 | |
ef547f2a | 882 | reqsk_queue_alloc(&icsk->icsk_accept_queue); |
a019d6fe | 883 | |
a019d6fe ACM |
884 | sk->sk_ack_backlog = 0; |
885 | inet_csk_delack_init(sk); | |
886 | ||
887 | /* There is race window here: we announce ourselves listening, | |
888 | * but this transition is still not validated by get_port(). | |
889 | * It is OK, because this socket enters to hash table only | |
890 | * after validation is complete. | |
891 | */ | |
563e0bb0 | 892 | inet_sk_state_store(sk, TCP_LISTEN); |
c720c7e8 ED |
893 | if (!sk->sk_prot->get_port(sk, inet->inet_num)) { |
894 | inet->inet_sport = htons(inet->inet_num); | |
a019d6fe ACM |
895 | |
896 | sk_dst_reset(sk); | |
086c653f | 897 | err = sk->sk_prot->hash(sk); |
a019d6fe | 898 | |
086c653f CG |
899 | if (likely(!err)) |
900 | return 0; | |
a019d6fe ACM |
901 | } |
902 | ||
563e0bb0 | 903 | inet_sk_set_state(sk, TCP_CLOSE); |
086c653f | 904 | return err; |
a019d6fe | 905 | } |
a019d6fe ACM |
906 | EXPORT_SYMBOL_GPL(inet_csk_listen_start); |
907 | ||
ebb516af ED |
908 | static void inet_child_forget(struct sock *sk, struct request_sock *req, |
909 | struct sock *child) | |
910 | { | |
911 | sk->sk_prot->disconnect(child, O_NONBLOCK); | |
912 | ||
913 | sock_orphan(child); | |
914 | ||
915 | percpu_counter_inc(sk->sk_prot->orphan_count); | |
916 | ||
917 | if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) { | |
918 | BUG_ON(tcp_sk(child)->fastopen_rsk != req); | |
919 | BUG_ON(sk != req->rsk_listener); | |
920 | ||
921 | /* Paranoid, to prevent race condition if | |
922 | * an inbound pkt destined for child is | |
923 | * blocked by sock lock in tcp_v4_rcv(). | |
924 | * Also to satisfy an assertion in | |
925 | * tcp_v4_destroy_sock(). | |
926 | */ | |
927 | tcp_sk(child)->fastopen_rsk = NULL; | |
928 | } | |
929 | inet_csk_destroy_sock(child); | |
ebb516af ED |
930 | } |
931 | ||
7716682c ED |
932 | struct sock *inet_csk_reqsk_queue_add(struct sock *sk, |
933 | struct request_sock *req, | |
934 | struct sock *child) | |
ebb516af ED |
935 | { |
936 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; | |
937 | ||
938 | spin_lock(&queue->rskq_lock); | |
939 | if (unlikely(sk->sk_state != TCP_LISTEN)) { | |
940 | inet_child_forget(sk, req, child); | |
7716682c | 941 | child = NULL; |
ebb516af ED |
942 | } else { |
943 | req->sk = child; | |
944 | req->dl_next = NULL; | |
945 | if (queue->rskq_accept_head == NULL) | |
946 | queue->rskq_accept_head = req; | |
947 | else | |
948 | queue->rskq_accept_tail->dl_next = req; | |
949 | queue->rskq_accept_tail = req; | |
950 | sk_acceptq_added(sk); | |
951 | } | |
952 | spin_unlock(&queue->rskq_lock); | |
7716682c | 953 | return child; |
ebb516af ED |
954 | } |
955 | EXPORT_SYMBOL(inet_csk_reqsk_queue_add); | |
956 | ||
5e0724d0 ED |
957 | struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child, |
958 | struct request_sock *req, bool own_req) | |
959 | { | |
960 | if (own_req) { | |
961 | inet_csk_reqsk_queue_drop(sk, req); | |
962 | reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req); | |
7716682c ED |
963 | if (inet_csk_reqsk_queue_add(sk, req, child)) |
964 | return child; | |
5e0724d0 ED |
965 | } |
966 | /* Too bad, another child took ownership of the request, undo. */ | |
967 | bh_unlock_sock(child); | |
968 | sock_put(child); | |
969 | return NULL; | |
970 | } | |
971 | EXPORT_SYMBOL(inet_csk_complete_hashdance); | |
972 | ||
a019d6fe ACM |
973 | /* |
974 | * This routine closes sockets which have been at least partially | |
975 | * opened, but not yet accepted. | |
976 | */ | |
977 | void inet_csk_listen_stop(struct sock *sk) | |
978 | { | |
979 | struct inet_connection_sock *icsk = inet_csk(sk); | |
8336886f | 980 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
fff1f300 | 981 | struct request_sock *next, *req; |
a019d6fe ACM |
982 | |
983 | /* Following specs, it would be better either to send FIN | |
984 | * (and enter FIN-WAIT-1, it is normal close) | |
985 | * or to send active reset (abort). | |
986 | * Certainly, it is pretty dangerous while synflood, but it is | |
987 | * bad justification for our negligence 8) | |
988 | * To be honest, we are not able to make either | |
989 | * of the variants now. --ANK | |
990 | */ | |
fff1f300 | 991 | while ((req = reqsk_queue_remove(queue, sk)) != NULL) { |
a019d6fe ACM |
992 | struct sock *child = req->sk; |
993 | ||
a019d6fe ACM |
994 | local_bh_disable(); |
995 | bh_lock_sock(child); | |
547b792c | 996 | WARN_ON(sock_owned_by_user(child)); |
a019d6fe ACM |
997 | sock_hold(child); |
998 | ||
ebb516af | 999 | inet_child_forget(sk, req, child); |
da8ab578 | 1000 | reqsk_put(req); |
a019d6fe ACM |
1001 | bh_unlock_sock(child); |
1002 | local_bh_enable(); | |
1003 | sock_put(child); | |
1004 | ||
92d6f176 | 1005 | cond_resched(); |
a019d6fe | 1006 | } |
0536fcc0 | 1007 | if (queue->fastopenq.rskq_rst_head) { |
8336886f | 1008 | /* Free all the reqs queued in rskq_rst_head. */ |
0536fcc0 | 1009 | spin_lock_bh(&queue->fastopenq.lock); |
fff1f300 | 1010 | req = queue->fastopenq.rskq_rst_head; |
0536fcc0 ED |
1011 | queue->fastopenq.rskq_rst_head = NULL; |
1012 | spin_unlock_bh(&queue->fastopenq.lock); | |
fff1f300 ED |
1013 | while (req != NULL) { |
1014 | next = req->dl_next; | |
13854e5a | 1015 | reqsk_put(req); |
fff1f300 | 1016 | req = next; |
8336886f JC |
1017 | } |
1018 | } | |
ebb516af | 1019 | WARN_ON_ONCE(sk->sk_ack_backlog); |
a019d6fe | 1020 | } |
a019d6fe | 1021 | EXPORT_SYMBOL_GPL(inet_csk_listen_stop); |
af05dc93 ACM |
1022 | |
1023 | void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) | |
1024 | { | |
1025 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
1026 | const struct inet_sock *inet = inet_sk(sk); | |
1027 | ||
1028 | sin->sin_family = AF_INET; | |
c720c7e8 ED |
1029 | sin->sin_addr.s_addr = inet->inet_daddr; |
1030 | sin->sin_port = inet->inet_dport; | |
af05dc93 | 1031 | } |
af05dc93 | 1032 | EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); |
c4d93909 | 1033 | |
dec73ff0 ACM |
1034 | #ifdef CONFIG_COMPAT |
1035 | int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, | |
1036 | char __user *optval, int __user *optlen) | |
1037 | { | |
dbeff12b | 1038 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 | 1039 | |
00db4124 | 1040 | if (icsk->icsk_af_ops->compat_getsockopt) |
dec73ff0 ACM |
1041 | return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, |
1042 | optval, optlen); | |
1043 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, | |
1044 | optval, optlen); | |
1045 | } | |
dec73ff0 ACM |
1046 | EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); |
1047 | ||
1048 | int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1049 | char __user *optval, unsigned int optlen) |
dec73ff0 | 1050 | { |
dbeff12b | 1051 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 | 1052 | |
00db4124 | 1053 | if (icsk->icsk_af_ops->compat_setsockopt) |
dec73ff0 ACM |
1054 | return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, |
1055 | optval, optlen); | |
1056 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, | |
1057 | optval, optlen); | |
1058 | } | |
dec73ff0 ACM |
1059 | EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); |
1060 | #endif | |
80d0a69f DM |
1061 | |
1062 | static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl) | |
1063 | { | |
5abf7f7e ED |
1064 | const struct inet_sock *inet = inet_sk(sk); |
1065 | const struct ip_options_rcu *inet_opt; | |
80d0a69f DM |
1066 | __be32 daddr = inet->inet_daddr; |
1067 | struct flowi4 *fl4; | |
1068 | struct rtable *rt; | |
1069 | ||
1070 | rcu_read_lock(); | |
1071 | inet_opt = rcu_dereference(inet->inet_opt); | |
1072 | if (inet_opt && inet_opt->opt.srr) | |
1073 | daddr = inet_opt->opt.faddr; | |
1074 | fl4 = &fl->u.ip4; | |
1075 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, | |
1076 | inet->inet_saddr, inet->inet_dport, | |
1077 | inet->inet_sport, sk->sk_protocol, | |
1078 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if); | |
1079 | if (IS_ERR(rt)) | |
1080 | rt = NULL; | |
1081 | if (rt) | |
1082 | sk_setup_caps(sk, &rt->dst); | |
1083 | rcu_read_unlock(); | |
1084 | ||
1085 | return &rt->dst; | |
1086 | } | |
1087 | ||
1088 | struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu) | |
1089 | { | |
1090 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
1091 | struct inet_sock *inet = inet_sk(sk); | |
1092 | ||
1093 | if (!dst) { | |
1094 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); | |
1095 | if (!dst) | |
1096 | goto out; | |
1097 | } | |
6700c270 | 1098 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
80d0a69f DM |
1099 | |
1100 | dst = __sk_dst_check(sk, 0); | |
1101 | if (!dst) | |
1102 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); | |
1103 | out: | |
1104 | return dst; | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(inet_csk_update_pmtu); |