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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> |
3f421baa ACM |
28 | |
29 | #ifdef INET_CSK_DEBUG | |
30 | const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n"; | |
31 | EXPORT_SYMBOL(inet_csk_timer_bug_msg); | |
32 | #endif | |
33 | ||
fe38d2a1 JB |
34 | #if IS_ENABLED(CONFIG_IPV6) |
35 | /* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6 | |
36 | * only, and any IPv4 addresses if not IPv6 only | |
37 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
38 | * IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY, | |
39 | * and 0.0.0.0 equals to 0.0.0.0 only | |
40 | */ | |
637bc8bb JB |
41 | static int ipv6_rcv_saddr_equal(const struct in6_addr *sk1_rcv_saddr6, |
42 | const struct in6_addr *sk2_rcv_saddr6, | |
43 | __be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr, | |
44 | bool sk1_ipv6only, bool sk2_ipv6only, | |
fe38d2a1 JB |
45 | bool match_wildcard) |
46 | { | |
637bc8bb | 47 | int addr_type = ipv6_addr_type(sk1_rcv_saddr6); |
fe38d2a1 JB |
48 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
49 | ||
50 | /* if both are mapped, treat as IPv4 */ | |
51 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) { | |
52 | if (!sk2_ipv6only) { | |
637bc8bb | 53 | if (sk1_rcv_saddr == sk2_rcv_saddr) |
fe38d2a1 | 54 | return 1; |
637bc8bb | 55 | if (!sk1_rcv_saddr || !sk2_rcv_saddr) |
fe38d2a1 JB |
56 | return match_wildcard; |
57 | } | |
58 | return 0; | |
59 | } | |
60 | ||
61 | if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY) | |
62 | return 1; | |
63 | ||
64 | if (addr_type2 == IPV6_ADDR_ANY && match_wildcard && | |
65 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
66 | return 1; | |
67 | ||
68 | if (addr_type == IPV6_ADDR_ANY && match_wildcard && | |
637bc8bb | 69 | !(sk1_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) |
fe38d2a1 JB |
70 | return 1; |
71 | ||
72 | if (sk2_rcv_saddr6 && | |
637bc8bb | 73 | ipv6_addr_equal(sk1_rcv_saddr6, sk2_rcv_saddr6)) |
fe38d2a1 JB |
74 | return 1; |
75 | ||
76 | return 0; | |
77 | } | |
78 | #endif | |
79 | ||
80 | /* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses | |
81 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
82 | * 0.0.0.0 only equals to 0.0.0.0 | |
83 | */ | |
637bc8bb JB |
84 | static int ipv4_rcv_saddr_equal(__be32 sk1_rcv_saddr, __be32 sk2_rcv_saddr, |
85 | bool sk2_ipv6only, bool match_wildcard) | |
fe38d2a1 | 86 | { |
637bc8bb JB |
87 | if (!sk2_ipv6only) { |
88 | if (sk1_rcv_saddr == sk2_rcv_saddr) | |
fe38d2a1 | 89 | return 1; |
637bc8bb | 90 | if (!sk1_rcv_saddr || !sk2_rcv_saddr) |
fe38d2a1 JB |
91 | return match_wildcard; |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
96 | int inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, | |
97 | bool match_wildcard) | |
98 | { | |
99 | #if IS_ENABLED(CONFIG_IPV6) | |
100 | if (sk->sk_family == AF_INET6) | |
637bc8bb | 101 | return ipv6_rcv_saddr_equal(&sk->sk_v6_rcv_saddr, |
319554f2 | 102 | inet6_rcv_saddr(sk2), |
637bc8bb JB |
103 | sk->sk_rcv_saddr, |
104 | sk2->sk_rcv_saddr, | |
105 | ipv6_only_sock(sk), | |
106 | ipv6_only_sock(sk2), | |
107 | match_wildcard); | |
fe38d2a1 | 108 | #endif |
637bc8bb JB |
109 | return ipv4_rcv_saddr_equal(sk->sk_rcv_saddr, sk2->sk_rcv_saddr, |
110 | ipv6_only_sock(sk2), match_wildcard); | |
fe38d2a1 JB |
111 | } |
112 | EXPORT_SYMBOL(inet_rcv_saddr_equal); | |
113 | ||
0bbf87d8 | 114 | void inet_get_local_port_range(struct net *net, int *low, int *high) |
227b60f5 | 115 | { |
95c96174 ED |
116 | unsigned int seq; |
117 | ||
227b60f5 | 118 | do { |
c9d8f1a6 | 119 | seq = read_seqbegin(&net->ipv4.ip_local_ports.lock); |
227b60f5 | 120 | |
c9d8f1a6 CW |
121 | *low = net->ipv4.ip_local_ports.range[0]; |
122 | *high = net->ipv4.ip_local_ports.range[1]; | |
123 | } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq)); | |
227b60f5 SH |
124 | } |
125 | EXPORT_SYMBOL(inet_get_local_port_range); | |
3f421baa | 126 | |
aa078842 JB |
127 | static int inet_csk_bind_conflict(const struct sock *sk, |
128 | const struct inet_bind_bucket *tb, | |
129 | bool relax, bool reuseport_ok) | |
3f421baa | 130 | { |
3f421baa | 131 | struct sock *sk2; |
0643ee4f TH |
132 | bool reuse = sk->sk_reuse; |
133 | bool reuseport = !!sk->sk_reuseport && reuseport_ok; | |
da5e3630 | 134 | kuid_t uid = sock_i_uid((struct sock *)sk); |
3f421baa | 135 | |
7477fd2e PE |
136 | /* |
137 | * Unlike other sk lookup places we do not check | |
138 | * for sk_net here, since _all_ the socks listed | |
139 | * in tb->owners list belong to the same net - the | |
140 | * one this bucket belongs to. | |
141 | */ | |
142 | ||
b67bfe0d | 143 | sk_for_each_bound(sk2, &tb->owners) { |
3f421baa | 144 | if (sk != sk2 && |
3f421baa ACM |
145 | (!sk->sk_bound_dev_if || |
146 | !sk2->sk_bound_dev_if || | |
147 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { | |
da5e3630 TH |
148 | if ((!reuse || !sk2->sk_reuse || |
149 | sk2->sk_state == TCP_LISTEN) && | |
150 | (!reuseport || !sk2->sk_reuseport || | |
c125e80b CG |
151 | rcu_access_pointer(sk->sk_reuseport_cb) || |
152 | (sk2->sk_state != TCP_TIME_WAIT && | |
da5e3630 | 153 | !uid_eq(uid, sock_i_uid(sk2))))) { |
aa078842 | 154 | if (inet_rcv_saddr_equal(sk, sk2, true)) |
3f421baa | 155 | break; |
8d238b25 | 156 | } |
aacd9289 AC |
157 | if (!relax && reuse && sk2->sk_reuse && |
158 | sk2->sk_state != TCP_LISTEN) { | |
aa078842 | 159 | if (inet_rcv_saddr_equal(sk, sk2, true)) |
aacd9289 AC |
160 | break; |
161 | } | |
3f421baa ACM |
162 | } |
163 | } | |
b67bfe0d | 164 | return sk2 != NULL; |
3f421baa | 165 | } |
971af18b | 166 | |
289141b7 JB |
167 | /* |
168 | * Find an open port number for the socket. Returns with the | |
169 | * inet_bind_hashbucket lock held. | |
3f421baa | 170 | */ |
289141b7 JB |
171 | static struct inet_bind_hashbucket * |
172 | inet_csk_find_open_port(struct sock *sk, struct inet_bind_bucket **tb_ret, int *port_ret) | |
3f421baa | 173 | { |
ea8add2b | 174 | struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo; |
289141b7 | 175 | int port = 0; |
3f421baa | 176 | struct inet_bind_hashbucket *head; |
3b1e0a65 | 177 | struct net *net = sock_net(sk); |
ea8add2b ED |
178 | int i, low, high, attempt_half; |
179 | struct inet_bind_bucket *tb; | |
ea8add2b | 180 | u32 remaining, offset; |
3f421baa | 181 | |
ea8add2b ED |
182 | attempt_half = (sk->sk_reuse == SK_CAN_REUSE) ? 1 : 0; |
183 | other_half_scan: | |
184 | inet_get_local_port_range(net, &low, &high); | |
185 | high++; /* [32768, 60999] -> [32768, 61000[ */ | |
186 | if (high - low < 4) | |
187 | attempt_half = 0; | |
188 | if (attempt_half) { | |
189 | int half = low + (((high - low) >> 2) << 1); | |
190 | ||
191 | if (attempt_half == 1) | |
192 | high = half; | |
193 | else | |
194 | low = half; | |
195 | } | |
196 | remaining = high - low; | |
197 | if (likely(remaining > 1)) | |
198 | remaining &= ~1U; | |
3f421baa | 199 | |
ea8add2b ED |
200 | offset = prandom_u32() % remaining; |
201 | /* __inet_hash_connect() favors ports having @low parity | |
202 | * We do the opposite to not pollute connect() users. | |
203 | */ | |
204 | offset |= 1U; | |
ea8add2b ED |
205 | |
206 | other_parity_scan: | |
207 | port = low + offset; | |
208 | for (i = 0; i < remaining; i += 2, port += 2) { | |
209 | if (unlikely(port >= high)) | |
210 | port -= remaining; | |
211 | if (inet_is_local_reserved_port(net, port)) | |
212 | continue; | |
213 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
214 | hinfo->bhash_size)]; | |
215 | spin_lock_bh(&head->lock); | |
216 | inet_bind_bucket_for_each(tb, &head->chain) | |
217 | if (net_eq(ib_net(tb), net) && tb->port == port) { | |
289141b7 | 218 | if (!inet_csk_bind_conflict(sk, tb, false, false)) |
6cd66616 | 219 | goto success; |
ea8add2b | 220 | goto next_port; |
946f9eb2 | 221 | } |
289141b7 JB |
222 | tb = NULL; |
223 | goto success; | |
ea8add2b ED |
224 | next_port: |
225 | spin_unlock_bh(&head->lock); | |
226 | cond_resched(); | |
227 | } | |
228 | ||
ea8add2b ED |
229 | offset--; |
230 | if (!(offset & 1)) | |
231 | goto other_parity_scan; | |
232 | ||
233 | if (attempt_half == 1) { | |
234 | /* OK we now try the upper half of the range */ | |
235 | attempt_half = 2; | |
236 | goto other_half_scan; | |
237 | } | |
289141b7 JB |
238 | return NULL; |
239 | success: | |
240 | *port_ret = port; | |
241 | *tb_ret = tb; | |
242 | return head; | |
243 | } | |
ea8add2b | 244 | |
637bc8bb JB |
245 | static inline int sk_reuseport_match(struct inet_bind_bucket *tb, |
246 | struct sock *sk) | |
247 | { | |
248 | kuid_t uid = sock_i_uid(sk); | |
249 | ||
250 | if (tb->fastreuseport <= 0) | |
251 | return 0; | |
252 | if (!sk->sk_reuseport) | |
253 | return 0; | |
254 | if (rcu_access_pointer(sk->sk_reuseport_cb)) | |
255 | return 0; | |
256 | if (!uid_eq(tb->fastuid, uid)) | |
257 | return 0; | |
258 | /* We only need to check the rcv_saddr if this tb was once marked | |
259 | * without fastreuseport and then was reset, as we can only know that | |
260 | * the fast_*rcv_saddr doesn't have any conflicts with the socks on the | |
261 | * owners list. | |
262 | */ | |
263 | if (tb->fastreuseport == FASTREUSEPORT_ANY) | |
264 | return 1; | |
265 | #if IS_ENABLED(CONFIG_IPV6) | |
266 | if (tb->fast_sk_family == AF_INET6) | |
267 | return ipv6_rcv_saddr_equal(&tb->fast_v6_rcv_saddr, | |
268 | &sk->sk_v6_rcv_saddr, | |
269 | tb->fast_rcv_saddr, | |
270 | sk->sk_rcv_saddr, | |
271 | tb->fast_ipv6_only, | |
272 | ipv6_only_sock(sk), true); | |
273 | #endif | |
274 | return ipv4_rcv_saddr_equal(tb->fast_rcv_saddr, sk->sk_rcv_saddr, | |
275 | ipv6_only_sock(sk), true); | |
276 | } | |
277 | ||
289141b7 JB |
278 | /* Obtain a reference to a local port for the given sock, |
279 | * if snum is zero it means select any available local port. | |
280 | * We try to allocate an odd port (and leave even ports for connect()) | |
281 | */ | |
282 | int inet_csk_get_port(struct sock *sk, unsigned short snum) | |
283 | { | |
284 | bool reuse = sk->sk_reuse && sk->sk_state != TCP_LISTEN; | |
285 | struct inet_hashinfo *hinfo = sk->sk_prot->h.hashinfo; | |
286 | int ret = 1, port = snum; | |
287 | struct inet_bind_hashbucket *head; | |
288 | struct net *net = sock_net(sk); | |
289 | struct inet_bind_bucket *tb = NULL; | |
290 | kuid_t uid = sock_i_uid(sk); | |
291 | ||
292 | if (!port) { | |
293 | head = inet_csk_find_open_port(sk, &tb, &port); | |
294 | if (!head) | |
295 | return ret; | |
296 | if (!tb) | |
297 | goto tb_not_found; | |
298 | goto success; | |
299 | } | |
300 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
301 | hinfo->bhash_size)]; | |
302 | spin_lock_bh(&head->lock); | |
303 | inet_bind_bucket_for_each(tb, &head->chain) | |
304 | if (net_eq(ib_net(tb), net) && tb->port == port) | |
305 | goto tb_found; | |
ea8add2b ED |
306 | tb_not_found: |
307 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, | |
308 | net, head, port); | |
309 | if (!tb) | |
310 | goto fail_unlock; | |
3f421baa ACM |
311 | tb_found: |
312 | if (!hlist_empty(&tb->owners)) { | |
4a17fd52 PE |
313 | if (sk->sk_reuse == SK_FORCE_REUSE) |
314 | goto success; | |
315 | ||
b9470c27 | 316 | if ((tb->fastreuse > 0 && reuse) || |
637bc8bb | 317 | sk_reuseport_match(tb, sk)) |
3f421baa | 318 | goto success; |
289141b7 | 319 | if (inet_csk_bind_conflict(sk, tb, true, true)) |
ea8add2b | 320 | goto fail_unlock; |
6cd66616 JB |
321 | } |
322 | success: | |
323 | if (!hlist_empty(&tb->owners)) { | |
ea8add2b | 324 | tb->fastreuse = reuse; |
da5e3630 | 325 | if (sk->sk_reuseport) { |
637bc8bb | 326 | tb->fastreuseport = FASTREUSEPORT_ANY; |
da5e3630 | 327 | tb->fastuid = uid; |
637bc8bb JB |
328 | tb->fast_rcv_saddr = sk->sk_rcv_saddr; |
329 | tb->fast_ipv6_only = ipv6_only_sock(sk); | |
330 | #if IS_ENABLED(CONFIG_IPV6) | |
331 | tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr; | |
332 | #endif | |
ea8add2b | 333 | } else { |
da5e3630 | 334 | tb->fastreuseport = 0; |
ea8add2b | 335 | } |
6cd66616 JB |
336 | } else { |
337 | if (!reuse) | |
338 | tb->fastreuse = 0; | |
637bc8bb JB |
339 | if (sk->sk_reuseport) { |
340 | /* We didn't match or we don't have fastreuseport set on | |
341 | * the tb, but we have sk_reuseport set on this socket | |
342 | * and we know that there are no bind conflicts with | |
343 | * this socket in this tb, so reset our tb's reuseport | |
344 | * settings so that any subsequent sockets that match | |
345 | * our current socket will be put on the fast path. | |
346 | * | |
347 | * If we reset we need to set FASTREUSEPORT_STRICT so we | |
348 | * do extra checking for all subsequent sk_reuseport | |
349 | * socks. | |
350 | */ | |
351 | if (!sk_reuseport_match(tb, sk)) { | |
352 | tb->fastreuseport = FASTREUSEPORT_STRICT; | |
353 | tb->fastuid = uid; | |
354 | tb->fast_rcv_saddr = sk->sk_rcv_saddr; | |
355 | tb->fast_ipv6_only = ipv6_only_sock(sk); | |
356 | #if IS_ENABLED(CONFIG_IPV6) | |
357 | tb->fast_v6_rcv_saddr = sk->sk_v6_rcv_saddr; | |
358 | #endif | |
359 | } | |
360 | } else { | |
6cd66616 | 361 | tb->fastreuseport = 0; |
637bc8bb | 362 | } |
da5e3630 | 363 | } |
3f421baa | 364 | if (!inet_csk(sk)->icsk_bind_hash) |
ea8add2b | 365 | inet_bind_hash(sk, tb, port); |
547b792c | 366 | WARN_ON(inet_csk(sk)->icsk_bind_hash != tb); |
e905a9ed | 367 | ret = 0; |
3f421baa ACM |
368 | |
369 | fail_unlock: | |
ea8add2b | 370 | spin_unlock_bh(&head->lock); |
3f421baa ACM |
371 | return ret; |
372 | } | |
3f421baa ACM |
373 | EXPORT_SYMBOL_GPL(inet_csk_get_port); |
374 | ||
375 | /* | |
376 | * Wait for an incoming connection, avoid race conditions. This must be called | |
377 | * with the socket locked. | |
378 | */ | |
379 | static int inet_csk_wait_for_connect(struct sock *sk, long timeo) | |
380 | { | |
381 | struct inet_connection_sock *icsk = inet_csk(sk); | |
382 | DEFINE_WAIT(wait); | |
383 | int err; | |
384 | ||
385 | /* | |
386 | * True wake-one mechanism for incoming connections: only | |
387 | * one process gets woken up, not the 'whole herd'. | |
388 | * Since we do not 'race & poll' for established sockets | |
389 | * anymore, the common case will execute the loop only once. | |
390 | * | |
391 | * Subtle issue: "add_wait_queue_exclusive()" will be added | |
392 | * after any current non-exclusive waiters, and we know that | |
393 | * it will always _stay_ after any new non-exclusive waiters | |
394 | * because all non-exclusive waiters are added at the | |
395 | * beginning of the wait-queue. As such, it's ok to "drop" | |
396 | * our exclusiveness temporarily when we get woken up without | |
397 | * having to remove and re-insert us on the wait queue. | |
398 | */ | |
399 | for (;;) { | |
aa395145 | 400 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
3f421baa ACM |
401 | TASK_INTERRUPTIBLE); |
402 | release_sock(sk); | |
403 | if (reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
404 | timeo = schedule_timeout(timeo); | |
cb7cf8a3 | 405 | sched_annotate_sleep(); |
3f421baa ACM |
406 | lock_sock(sk); |
407 | err = 0; | |
408 | if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) | |
409 | break; | |
410 | err = -EINVAL; | |
411 | if (sk->sk_state != TCP_LISTEN) | |
412 | break; | |
413 | err = sock_intr_errno(timeo); | |
414 | if (signal_pending(current)) | |
415 | break; | |
416 | err = -EAGAIN; | |
417 | if (!timeo) | |
418 | break; | |
419 | } | |
aa395145 | 420 | finish_wait(sk_sleep(sk), &wait); |
3f421baa ACM |
421 | return err; |
422 | } | |
423 | ||
424 | /* | |
425 | * This will accept the next outstanding connection. | |
426 | */ | |
cdfbabfb | 427 | struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern) |
3f421baa ACM |
428 | { |
429 | struct inet_connection_sock *icsk = inet_csk(sk); | |
8336886f | 430 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
8336886f | 431 | struct request_sock *req; |
e3d95ad7 | 432 | struct sock *newsk; |
3f421baa ACM |
433 | int error; |
434 | ||
435 | lock_sock(sk); | |
436 | ||
437 | /* We need to make sure that this socket is listening, | |
438 | * and that it has something pending. | |
439 | */ | |
440 | error = -EINVAL; | |
441 | if (sk->sk_state != TCP_LISTEN) | |
442 | goto out_err; | |
443 | ||
444 | /* Find already established connection */ | |
8336886f | 445 | if (reqsk_queue_empty(queue)) { |
3f421baa ACM |
446 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
447 | ||
448 | /* If this is a non blocking socket don't sleep */ | |
449 | error = -EAGAIN; | |
450 | if (!timeo) | |
451 | goto out_err; | |
452 | ||
453 | error = inet_csk_wait_for_connect(sk, timeo); | |
454 | if (error) | |
455 | goto out_err; | |
456 | } | |
fff1f300 | 457 | req = reqsk_queue_remove(queue, sk); |
8336886f JC |
458 | newsk = req->sk; |
459 | ||
e3d95ad7 | 460 | if (sk->sk_protocol == IPPROTO_TCP && |
0536fcc0 ED |
461 | tcp_rsk(req)->tfo_listener) { |
462 | spin_lock_bh(&queue->fastopenq.lock); | |
9439ce00 | 463 | if (tcp_rsk(req)->tfo_listener) { |
8336886f JC |
464 | /* We are still waiting for the final ACK from 3WHS |
465 | * so can't free req now. Instead, we set req->sk to | |
466 | * NULL to signify that the child socket is taken | |
467 | * so reqsk_fastopen_remove() will free the req | |
468 | * when 3WHS finishes (or is aborted). | |
469 | */ | |
470 | req->sk = NULL; | |
471 | req = NULL; | |
472 | } | |
0536fcc0 | 473 | spin_unlock_bh(&queue->fastopenq.lock); |
8336886f | 474 | } |
3f421baa ACM |
475 | out: |
476 | release_sock(sk); | |
8336886f | 477 | if (req) |
13854e5a | 478 | reqsk_put(req); |
3f421baa ACM |
479 | return newsk; |
480 | out_err: | |
481 | newsk = NULL; | |
8336886f | 482 | req = NULL; |
3f421baa ACM |
483 | *err = error; |
484 | goto out; | |
485 | } | |
3f421baa ACM |
486 | EXPORT_SYMBOL(inet_csk_accept); |
487 | ||
488 | /* | |
489 | * Using different timers for retransmit, delayed acks and probes | |
e905a9ed | 490 | * We may wish use just one timer maintaining a list of expire jiffies |
3f421baa ACM |
491 | * to optimize. |
492 | */ | |
493 | void inet_csk_init_xmit_timers(struct sock *sk, | |
494 | void (*retransmit_handler)(unsigned long), | |
495 | void (*delack_handler)(unsigned long), | |
496 | void (*keepalive_handler)(unsigned long)) | |
497 | { | |
498 | struct inet_connection_sock *icsk = inet_csk(sk); | |
499 | ||
b24b8a24 PE |
500 | setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler, |
501 | (unsigned long)sk); | |
502 | setup_timer(&icsk->icsk_delack_timer, delack_handler, | |
503 | (unsigned long)sk); | |
504 | setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk); | |
3f421baa ACM |
505 | icsk->icsk_pending = icsk->icsk_ack.pending = 0; |
506 | } | |
3f421baa ACM |
507 | EXPORT_SYMBOL(inet_csk_init_xmit_timers); |
508 | ||
509 | void inet_csk_clear_xmit_timers(struct sock *sk) | |
510 | { | |
511 | struct inet_connection_sock *icsk = inet_csk(sk); | |
512 | ||
513 | icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; | |
514 | ||
515 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); | |
516 | sk_stop_timer(sk, &icsk->icsk_delack_timer); | |
517 | sk_stop_timer(sk, &sk->sk_timer); | |
518 | } | |
3f421baa ACM |
519 | EXPORT_SYMBOL(inet_csk_clear_xmit_timers); |
520 | ||
521 | void inet_csk_delete_keepalive_timer(struct sock *sk) | |
522 | { | |
523 | sk_stop_timer(sk, &sk->sk_timer); | |
524 | } | |
3f421baa ACM |
525 | EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); |
526 | ||
527 | void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) | |
528 | { | |
529 | sk_reset_timer(sk, &sk->sk_timer, jiffies + len); | |
530 | } | |
3f421baa ACM |
531 | EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); |
532 | ||
e5895bc6 | 533 | struct dst_entry *inet_csk_route_req(const struct sock *sk, |
6bd023f3 | 534 | struct flowi4 *fl4, |
ba3f7f04 | 535 | const struct request_sock *req) |
3f421baa | 536 | { |
3f421baa | 537 | const struct inet_request_sock *ireq = inet_rsk(req); |
8b929ab1 ED |
538 | struct net *net = read_pnet(&ireq->ireq_net); |
539 | struct ip_options_rcu *opt = ireq->opt; | |
540 | struct rtable *rt; | |
3f421baa | 541 | |
8b929ab1 | 542 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
e79d9bc7 | 543 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
8b929ab1 | 544 | sk->sk_protocol, inet_sk_flowi_flags(sk), |
634fb979 | 545 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
8b929ab1 | 546 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
e2d118a1 | 547 | htons(ireq->ir_num), sk->sk_uid); |
6bd023f3 DM |
548 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
549 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe | 550 | if (IS_ERR(rt)) |
857a6e0a | 551 | goto no_route; |
155e8336 | 552 | if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway) |
857a6e0a | 553 | goto route_err; |
d8d1f30b | 554 | return &rt->dst; |
857a6e0a IJ |
555 | |
556 | route_err: | |
557 | ip_rt_put(rt); | |
558 | no_route: | |
b45386ef | 559 | __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
857a6e0a | 560 | return NULL; |
3f421baa | 561 | } |
3f421baa ACM |
562 | EXPORT_SYMBOL_GPL(inet_csk_route_req); |
563 | ||
a2432c4f | 564 | struct dst_entry *inet_csk_route_child_sock(const struct sock *sk, |
77357a95 DM |
565 | struct sock *newsk, |
566 | const struct request_sock *req) | |
567 | { | |
568 | const struct inet_request_sock *ireq = inet_rsk(req); | |
8b929ab1 | 569 | struct net *net = read_pnet(&ireq->ireq_net); |
77357a95 | 570 | struct inet_sock *newinet = inet_sk(newsk); |
1a7b27c9 | 571 | struct ip_options_rcu *opt; |
77357a95 DM |
572 | struct flowi4 *fl4; |
573 | struct rtable *rt; | |
574 | ||
575 | fl4 = &newinet->cork.fl.u.ip4; | |
1a7b27c9 CP |
576 | |
577 | rcu_read_lock(); | |
578 | opt = rcu_dereference(newinet->inet_opt); | |
8b929ab1 | 579 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
77357a95 DM |
580 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
581 | sk->sk_protocol, inet_sk_flowi_flags(sk), | |
634fb979 | 582 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
8b929ab1 | 583 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
e2d118a1 | 584 | htons(ireq->ir_num), sk->sk_uid); |
77357a95 DM |
585 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
586 | rt = ip_route_output_flow(net, fl4, sk); | |
587 | if (IS_ERR(rt)) | |
588 | goto no_route; | |
155e8336 | 589 | if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway) |
77357a95 | 590 | goto route_err; |
1a7b27c9 | 591 | rcu_read_unlock(); |
77357a95 DM |
592 | return &rt->dst; |
593 | ||
594 | route_err: | |
595 | ip_rt_put(rt); | |
596 | no_route: | |
1a7b27c9 | 597 | rcu_read_unlock(); |
b45386ef | 598 | __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
77357a95 DM |
599 | return NULL; |
600 | } | |
601 | EXPORT_SYMBOL_GPL(inet_csk_route_child_sock); | |
602 | ||
dfd56b8b | 603 | #if IS_ENABLED(CONFIG_IPV6) |
3f421baa ACM |
604 | #define AF_INET_FAMILY(fam) ((fam) == AF_INET) |
605 | #else | |
fa76ce73 | 606 | #define AF_INET_FAMILY(fam) true |
3f421baa ACM |
607 | #endif |
608 | ||
0c3d79bc JA |
609 | /* Decide when to expire the request and when to resend SYN-ACK */ |
610 | static inline void syn_ack_recalc(struct request_sock *req, const int thresh, | |
611 | const int max_retries, | |
612 | const u8 rskq_defer_accept, | |
613 | int *expire, int *resend) | |
614 | { | |
615 | if (!rskq_defer_accept) { | |
e6c022a4 | 616 | *expire = req->num_timeout >= thresh; |
0c3d79bc JA |
617 | *resend = 1; |
618 | return; | |
619 | } | |
e6c022a4 ED |
620 | *expire = req->num_timeout >= thresh && |
621 | (!inet_rsk(req)->acked || req->num_timeout >= max_retries); | |
0c3d79bc JA |
622 | /* |
623 | * Do not resend while waiting for data after ACK, | |
624 | * start to resend on end of deferring period to give | |
625 | * last chance for data or ACK to create established socket. | |
626 | */ | |
627 | *resend = !inet_rsk(req)->acked || | |
e6c022a4 | 628 | req->num_timeout >= rskq_defer_accept - 1; |
0c3d79bc JA |
629 | } |
630 | ||
1b70e977 | 631 | int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req) |
e6c022a4 | 632 | { |
1a2c6181 | 633 | int err = req->rsk_ops->rtx_syn_ack(parent, req); |
e6c022a4 ED |
634 | |
635 | if (!err) | |
636 | req->num_retrans++; | |
637 | return err; | |
638 | } | |
639 | EXPORT_SYMBOL(inet_rtx_syn_ack); | |
640 | ||
079096f1 | 641 | /* return true if req was found in the ehash table */ |
b357a364 ED |
642 | static bool reqsk_queue_unlink(struct request_sock_queue *queue, |
643 | struct request_sock *req) | |
644 | { | |
079096f1 | 645 | struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo; |
5e0724d0 | 646 | bool found = false; |
b357a364 | 647 | |
5e0724d0 ED |
648 | if (sk_hashed(req_to_sk(req))) { |
649 | spinlock_t *lock = inet_ehash_lockp(hashinfo, req->rsk_hash); | |
b357a364 | 650 | |
5e0724d0 ED |
651 | spin_lock(lock); |
652 | found = __sk_nulls_del_node_init_rcu(req_to_sk(req)); | |
653 | spin_unlock(lock); | |
654 | } | |
83fccfc3 | 655 | if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer)) |
b357a364 ED |
656 | reqsk_put(req); |
657 | return found; | |
658 | } | |
659 | ||
660 | void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req) | |
661 | { | |
662 | if (reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req)) { | |
663 | reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req); | |
664 | reqsk_put(req); | |
665 | } | |
666 | } | |
667 | EXPORT_SYMBOL(inet_csk_reqsk_queue_drop); | |
668 | ||
f03f2e15 ED |
669 | void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req) |
670 | { | |
671 | inet_csk_reqsk_queue_drop(sk, req); | |
672 | reqsk_put(req); | |
673 | } | |
674 | EXPORT_SYMBOL(inet_csk_reqsk_queue_drop_and_put); | |
675 | ||
fa76ce73 | 676 | static void reqsk_timer_handler(unsigned long data) |
a019d6fe | 677 | { |
fa76ce73 ED |
678 | struct request_sock *req = (struct request_sock *)data; |
679 | struct sock *sk_listener = req->rsk_listener; | |
7c083ecb | 680 | struct net *net = sock_net(sk_listener); |
fa76ce73 | 681 | struct inet_connection_sock *icsk = inet_csk(sk_listener); |
a019d6fe | 682 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
2b41fab7 | 683 | int qlen, expire = 0, resend = 0; |
fa76ce73 | 684 | int max_retries, thresh; |
2b41fab7 | 685 | u8 defer_accept; |
a019d6fe | 686 | |
00fd38d9 | 687 | if (sk_state_load(sk_listener) != TCP_LISTEN) |
079096f1 | 688 | goto drop; |
a019d6fe | 689 | |
7c083ecb | 690 | max_retries = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_synack_retries; |
fa76ce73 | 691 | thresh = max_retries; |
a019d6fe ACM |
692 | /* Normally all the openreqs are young and become mature |
693 | * (i.e. converted to established socket) for first timeout. | |
fd4f2cea | 694 | * If synack was not acknowledged for 1 second, it means |
a019d6fe ACM |
695 | * one of the following things: synack was lost, ack was lost, |
696 | * rtt is high or nobody planned to ack (i.e. synflood). | |
697 | * When server is a bit loaded, queue is populated with old | |
698 | * open requests, reducing effective size of queue. | |
699 | * When server is well loaded, queue size reduces to zero | |
700 | * after several minutes of work. It is not synflood, | |
701 | * it is normal operation. The solution is pruning | |
702 | * too old entries overriding normal timeout, when | |
703 | * situation becomes dangerous. | |
704 | * | |
705 | * Essentially, we reserve half of room for young | |
706 | * embrions; and abort old ones without pity, if old | |
707 | * ones are about to clog our table. | |
708 | */ | |
aac065c5 | 709 | qlen = reqsk_queue_len(queue); |
acb4a6bf | 710 | if ((qlen << 1) > max(8U, sk_listener->sk_max_ack_backlog)) { |
aac065c5 | 711 | int young = reqsk_queue_len_young(queue) << 1; |
a019d6fe ACM |
712 | |
713 | while (thresh > 2) { | |
2b41fab7 | 714 | if (qlen < young) |
a019d6fe ACM |
715 | break; |
716 | thresh--; | |
717 | young <<= 1; | |
718 | } | |
719 | } | |
2b41fab7 ED |
720 | defer_accept = READ_ONCE(queue->rskq_defer_accept); |
721 | if (defer_accept) | |
722 | max_retries = defer_accept; | |
723 | syn_ack_recalc(req, thresh, max_retries, defer_accept, | |
fa76ce73 | 724 | &expire, &resend); |
42cb80a2 | 725 | req->rsk_ops->syn_ack_timeout(req); |
fa76ce73 ED |
726 | if (!expire && |
727 | (!resend || | |
728 | !inet_rtx_syn_ack(sk_listener, req) || | |
729 | inet_rsk(req)->acked)) { | |
730 | unsigned long timeo; | |
731 | ||
732 | if (req->num_timeout++ == 0) | |
aac065c5 | 733 | atomic_dec(&queue->young); |
fa76ce73 | 734 | timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); |
f3438bc7 | 735 | mod_timer(&req->rsk_timer, jiffies + timeo); |
fa76ce73 ED |
736 | return; |
737 | } | |
079096f1 | 738 | drop: |
f03f2e15 | 739 | inet_csk_reqsk_queue_drop_and_put(sk_listener, req); |
fa76ce73 | 740 | } |
ec0a1966 | 741 | |
079096f1 ED |
742 | static void reqsk_queue_hash_req(struct request_sock *req, |
743 | unsigned long timeout) | |
fa76ce73 | 744 | { |
fa76ce73 ED |
745 | req->num_retrans = 0; |
746 | req->num_timeout = 0; | |
747 | req->sk = NULL; | |
a019d6fe | 748 | |
f3438bc7 TG |
749 | setup_pinned_timer(&req->rsk_timer, reqsk_timer_handler, |
750 | (unsigned long)req); | |
751 | mod_timer(&req->rsk_timer, jiffies + timeout); | |
29c68526 | 752 | |
079096f1 | 753 | inet_ehash_insert(req_to_sk(req), NULL); |
fa76ce73 ED |
754 | /* before letting lookups find us, make sure all req fields |
755 | * are committed to memory and refcnt initialized. | |
756 | */ | |
757 | smp_wmb(); | |
ca6fb065 | 758 | atomic_set(&req->rsk_refcnt, 2 + 1); |
079096f1 | 759 | } |
a019d6fe | 760 | |
079096f1 ED |
761 | void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, |
762 | unsigned long timeout) | |
763 | { | |
764 | reqsk_queue_hash_req(req, timeout); | |
765 | inet_csk_reqsk_queue_added(sk); | |
a019d6fe | 766 | } |
079096f1 | 767 | EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); |
a019d6fe | 768 | |
e56c57d0 ED |
769 | /** |
770 | * inet_csk_clone_lock - clone an inet socket, and lock its clone | |
771 | * @sk: the socket to clone | |
772 | * @req: request_sock | |
773 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
774 | * | |
775 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
776 | */ | |
777 | struct sock *inet_csk_clone_lock(const struct sock *sk, | |
778 | const struct request_sock *req, | |
779 | const gfp_t priority) | |
9f1d2604 | 780 | { |
e56c57d0 | 781 | struct sock *newsk = sk_clone_lock(sk, priority); |
9f1d2604 | 782 | |
00db4124 | 783 | if (newsk) { |
9f1d2604 ACM |
784 | struct inet_connection_sock *newicsk = inet_csk(newsk); |
785 | ||
786 | newsk->sk_state = TCP_SYN_RECV; | |
787 | newicsk->icsk_bind_hash = NULL; | |
788 | ||
634fb979 | 789 | inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port; |
b44084c2 ED |
790 | inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num; |
791 | inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num); | |
9f1d2604 ACM |
792 | newsk->sk_write_space = sk_stream_write_space; |
793 | ||
85017869 ED |
794 | /* listeners have SOCK_RCU_FREE, not the children */ |
795 | sock_reset_flag(newsk, SOCK_RCU_FREE); | |
796 | ||
84f39b08 | 797 | newsk->sk_mark = inet_rsk(req)->ir_mark; |
33cf7c90 ED |
798 | atomic64_set(&newsk->sk_cookie, |
799 | atomic64_read(&inet_rsk(req)->ir_cookie)); | |
84f39b08 | 800 | |
9f1d2604 | 801 | newicsk->icsk_retransmits = 0; |
6687e988 ACM |
802 | newicsk->icsk_backoff = 0; |
803 | newicsk->icsk_probes_out = 0; | |
9f1d2604 ACM |
804 | |
805 | /* Deinitialize accept_queue to trap illegal accesses. */ | |
806 | memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); | |
4237c75c VY |
807 | |
808 | security_inet_csk_clone(newsk, req); | |
9f1d2604 ACM |
809 | } |
810 | return newsk; | |
811 | } | |
e56c57d0 | 812 | EXPORT_SYMBOL_GPL(inet_csk_clone_lock); |
a019d6fe ACM |
813 | |
814 | /* | |
815 | * At this point, there should be no process reference to this | |
816 | * socket, and thus no user references at all. Therefore we | |
817 | * can assume the socket waitqueue is inactive and nobody will | |
818 | * try to jump onto it. | |
819 | */ | |
820 | void inet_csk_destroy_sock(struct sock *sk) | |
821 | { | |
547b792c IJ |
822 | WARN_ON(sk->sk_state != TCP_CLOSE); |
823 | WARN_ON(!sock_flag(sk, SOCK_DEAD)); | |
a019d6fe ACM |
824 | |
825 | /* It cannot be in hash table! */ | |
547b792c | 826 | WARN_ON(!sk_unhashed(sk)); |
a019d6fe | 827 | |
c720c7e8 ED |
828 | /* If it has not 0 inet_sk(sk)->inet_num, it must be bound */ |
829 | WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash); | |
a019d6fe ACM |
830 | |
831 | sk->sk_prot->destroy(sk); | |
832 | ||
833 | sk_stream_kill_queues(sk); | |
834 | ||
835 | xfrm_sk_free_policy(sk); | |
836 | ||
837 | sk_refcnt_debug_release(sk); | |
838 | ||
dd24c001 | 839 | percpu_counter_dec(sk->sk_prot->orphan_count); |
c2a2efbb | 840 | |
a019d6fe ACM |
841 | sock_put(sk); |
842 | } | |
a019d6fe ACM |
843 | EXPORT_SYMBOL(inet_csk_destroy_sock); |
844 | ||
e337e24d CP |
845 | /* This function allows to force a closure of a socket after the call to |
846 | * tcp/dccp_create_openreq_child(). | |
847 | */ | |
848 | void inet_csk_prepare_forced_close(struct sock *sk) | |
c10cb5fc | 849 | __releases(&sk->sk_lock.slock) |
e337e24d CP |
850 | { |
851 | /* sk_clone_lock locked the socket and set refcnt to 2 */ | |
852 | bh_unlock_sock(sk); | |
853 | sock_put(sk); | |
854 | ||
855 | /* The below has to be done to allow calling inet_csk_destroy_sock */ | |
856 | sock_set_flag(sk, SOCK_DEAD); | |
857 | percpu_counter_inc(sk->sk_prot->orphan_count); | |
858 | inet_sk(sk)->inet_num = 0; | |
859 | } | |
860 | EXPORT_SYMBOL(inet_csk_prepare_forced_close); | |
861 | ||
f985c65c | 862 | int inet_csk_listen_start(struct sock *sk, int backlog) |
a019d6fe | 863 | { |
a019d6fe | 864 | struct inet_connection_sock *icsk = inet_csk(sk); |
10cbc8f1 | 865 | struct inet_sock *inet = inet_sk(sk); |
086c653f | 866 | int err = -EADDRINUSE; |
a019d6fe | 867 | |
ef547f2a | 868 | reqsk_queue_alloc(&icsk->icsk_accept_queue); |
a019d6fe | 869 | |
f985c65c | 870 | sk->sk_max_ack_backlog = backlog; |
a019d6fe ACM |
871 | sk->sk_ack_backlog = 0; |
872 | inet_csk_delack_init(sk); | |
873 | ||
874 | /* There is race window here: we announce ourselves listening, | |
875 | * but this transition is still not validated by get_port(). | |
876 | * It is OK, because this socket enters to hash table only | |
877 | * after validation is complete. | |
878 | */ | |
00fd38d9 | 879 | sk_state_store(sk, TCP_LISTEN); |
c720c7e8 ED |
880 | if (!sk->sk_prot->get_port(sk, inet->inet_num)) { |
881 | inet->inet_sport = htons(inet->inet_num); | |
a019d6fe ACM |
882 | |
883 | sk_dst_reset(sk); | |
086c653f | 884 | err = sk->sk_prot->hash(sk); |
a019d6fe | 885 | |
086c653f CG |
886 | if (likely(!err)) |
887 | return 0; | |
a019d6fe ACM |
888 | } |
889 | ||
890 | sk->sk_state = TCP_CLOSE; | |
086c653f | 891 | return err; |
a019d6fe | 892 | } |
a019d6fe ACM |
893 | EXPORT_SYMBOL_GPL(inet_csk_listen_start); |
894 | ||
ebb516af ED |
895 | static void inet_child_forget(struct sock *sk, struct request_sock *req, |
896 | struct sock *child) | |
897 | { | |
898 | sk->sk_prot->disconnect(child, O_NONBLOCK); | |
899 | ||
900 | sock_orphan(child); | |
901 | ||
902 | percpu_counter_inc(sk->sk_prot->orphan_count); | |
903 | ||
904 | if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) { | |
905 | BUG_ON(tcp_sk(child)->fastopen_rsk != req); | |
906 | BUG_ON(sk != req->rsk_listener); | |
907 | ||
908 | /* Paranoid, to prevent race condition if | |
909 | * an inbound pkt destined for child is | |
910 | * blocked by sock lock in tcp_v4_rcv(). | |
911 | * Also to satisfy an assertion in | |
912 | * tcp_v4_destroy_sock(). | |
913 | */ | |
914 | tcp_sk(child)->fastopen_rsk = NULL; | |
915 | } | |
916 | inet_csk_destroy_sock(child); | |
917 | reqsk_put(req); | |
918 | } | |
919 | ||
7716682c ED |
920 | struct sock *inet_csk_reqsk_queue_add(struct sock *sk, |
921 | struct request_sock *req, | |
922 | struct sock *child) | |
ebb516af ED |
923 | { |
924 | struct request_sock_queue *queue = &inet_csk(sk)->icsk_accept_queue; | |
925 | ||
926 | spin_lock(&queue->rskq_lock); | |
927 | if (unlikely(sk->sk_state != TCP_LISTEN)) { | |
928 | inet_child_forget(sk, req, child); | |
7716682c | 929 | child = NULL; |
ebb516af ED |
930 | } else { |
931 | req->sk = child; | |
932 | req->dl_next = NULL; | |
933 | if (queue->rskq_accept_head == NULL) | |
934 | queue->rskq_accept_head = req; | |
935 | else | |
936 | queue->rskq_accept_tail->dl_next = req; | |
937 | queue->rskq_accept_tail = req; | |
938 | sk_acceptq_added(sk); | |
939 | } | |
940 | spin_unlock(&queue->rskq_lock); | |
7716682c | 941 | return child; |
ebb516af ED |
942 | } |
943 | EXPORT_SYMBOL(inet_csk_reqsk_queue_add); | |
944 | ||
5e0724d0 ED |
945 | struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child, |
946 | struct request_sock *req, bool own_req) | |
947 | { | |
948 | if (own_req) { | |
949 | inet_csk_reqsk_queue_drop(sk, req); | |
950 | reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req); | |
7716682c ED |
951 | if (inet_csk_reqsk_queue_add(sk, req, child)) |
952 | return child; | |
5e0724d0 ED |
953 | } |
954 | /* Too bad, another child took ownership of the request, undo. */ | |
955 | bh_unlock_sock(child); | |
956 | sock_put(child); | |
957 | return NULL; | |
958 | } | |
959 | EXPORT_SYMBOL(inet_csk_complete_hashdance); | |
960 | ||
a019d6fe ACM |
961 | /* |
962 | * This routine closes sockets which have been at least partially | |
963 | * opened, but not yet accepted. | |
964 | */ | |
965 | void inet_csk_listen_stop(struct sock *sk) | |
966 | { | |
967 | struct inet_connection_sock *icsk = inet_csk(sk); | |
8336886f | 968 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
fff1f300 | 969 | struct request_sock *next, *req; |
a019d6fe ACM |
970 | |
971 | /* Following specs, it would be better either to send FIN | |
972 | * (and enter FIN-WAIT-1, it is normal close) | |
973 | * or to send active reset (abort). | |
974 | * Certainly, it is pretty dangerous while synflood, but it is | |
975 | * bad justification for our negligence 8) | |
976 | * To be honest, we are not able to make either | |
977 | * of the variants now. --ANK | |
978 | */ | |
fff1f300 | 979 | while ((req = reqsk_queue_remove(queue, sk)) != NULL) { |
a019d6fe ACM |
980 | struct sock *child = req->sk; |
981 | ||
a019d6fe ACM |
982 | local_bh_disable(); |
983 | bh_lock_sock(child); | |
547b792c | 984 | WARN_ON(sock_owned_by_user(child)); |
a019d6fe ACM |
985 | sock_hold(child); |
986 | ||
ebb516af | 987 | inet_child_forget(sk, req, child); |
a019d6fe ACM |
988 | bh_unlock_sock(child); |
989 | local_bh_enable(); | |
990 | sock_put(child); | |
991 | ||
92d6f176 | 992 | cond_resched(); |
a019d6fe | 993 | } |
0536fcc0 | 994 | if (queue->fastopenq.rskq_rst_head) { |
8336886f | 995 | /* Free all the reqs queued in rskq_rst_head. */ |
0536fcc0 | 996 | spin_lock_bh(&queue->fastopenq.lock); |
fff1f300 | 997 | req = queue->fastopenq.rskq_rst_head; |
0536fcc0 ED |
998 | queue->fastopenq.rskq_rst_head = NULL; |
999 | spin_unlock_bh(&queue->fastopenq.lock); | |
fff1f300 ED |
1000 | while (req != NULL) { |
1001 | next = req->dl_next; | |
13854e5a | 1002 | reqsk_put(req); |
fff1f300 | 1003 | req = next; |
8336886f JC |
1004 | } |
1005 | } | |
ebb516af | 1006 | WARN_ON_ONCE(sk->sk_ack_backlog); |
a019d6fe | 1007 | } |
a019d6fe | 1008 | EXPORT_SYMBOL_GPL(inet_csk_listen_stop); |
af05dc93 ACM |
1009 | |
1010 | void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) | |
1011 | { | |
1012 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
1013 | const struct inet_sock *inet = inet_sk(sk); | |
1014 | ||
1015 | sin->sin_family = AF_INET; | |
c720c7e8 ED |
1016 | sin->sin_addr.s_addr = inet->inet_daddr; |
1017 | sin->sin_port = inet->inet_dport; | |
af05dc93 | 1018 | } |
af05dc93 | 1019 | EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); |
c4d93909 | 1020 | |
dec73ff0 ACM |
1021 | #ifdef CONFIG_COMPAT |
1022 | int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, | |
1023 | char __user *optval, int __user *optlen) | |
1024 | { | |
dbeff12b | 1025 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 | 1026 | |
00db4124 | 1027 | if (icsk->icsk_af_ops->compat_getsockopt) |
dec73ff0 ACM |
1028 | return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, |
1029 | optval, optlen); | |
1030 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, | |
1031 | optval, optlen); | |
1032 | } | |
dec73ff0 ACM |
1033 | EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); |
1034 | ||
1035 | int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1036 | char __user *optval, unsigned int optlen) |
dec73ff0 | 1037 | { |
dbeff12b | 1038 | const struct inet_connection_sock *icsk = inet_csk(sk); |
dec73ff0 | 1039 | |
00db4124 | 1040 | if (icsk->icsk_af_ops->compat_setsockopt) |
dec73ff0 ACM |
1041 | return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, |
1042 | optval, optlen); | |
1043 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, | |
1044 | optval, optlen); | |
1045 | } | |
dec73ff0 ACM |
1046 | EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); |
1047 | #endif | |
80d0a69f DM |
1048 | |
1049 | static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl) | |
1050 | { | |
5abf7f7e ED |
1051 | const struct inet_sock *inet = inet_sk(sk); |
1052 | const struct ip_options_rcu *inet_opt; | |
80d0a69f DM |
1053 | __be32 daddr = inet->inet_daddr; |
1054 | struct flowi4 *fl4; | |
1055 | struct rtable *rt; | |
1056 | ||
1057 | rcu_read_lock(); | |
1058 | inet_opt = rcu_dereference(inet->inet_opt); | |
1059 | if (inet_opt && inet_opt->opt.srr) | |
1060 | daddr = inet_opt->opt.faddr; | |
1061 | fl4 = &fl->u.ip4; | |
1062 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, | |
1063 | inet->inet_saddr, inet->inet_dport, | |
1064 | inet->inet_sport, sk->sk_protocol, | |
1065 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if); | |
1066 | if (IS_ERR(rt)) | |
1067 | rt = NULL; | |
1068 | if (rt) | |
1069 | sk_setup_caps(sk, &rt->dst); | |
1070 | rcu_read_unlock(); | |
1071 | ||
1072 | return &rt->dst; | |
1073 | } | |
1074 | ||
1075 | struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu) | |
1076 | { | |
1077 | struct dst_entry *dst = __sk_dst_check(sk, 0); | |
1078 | struct inet_sock *inet = inet_sk(sk); | |
1079 | ||
1080 | if (!dst) { | |
1081 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); | |
1082 | if (!dst) | |
1083 | goto out; | |
1084 | } | |
6700c270 | 1085 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
80d0a69f DM |
1086 | |
1087 | dst = __sk_dst_check(sk, 0); | |
1088 | if (!dst) | |
1089 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); | |
1090 | out: | |
1091 | return dst; | |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(inet_csk_update_pmtu); |