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Commit | Line | Data |
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77d8bf9c 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 | * Generic INET transport hashtables | |
7 | * | |
8 | * Authors: Lotsa people, from code originally in tcp | |
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 | ||
2d8c4ce5 | 16 | #include <linux/module.h> |
a7f5e7f1 | 17 | #include <linux/random.h> |
f3f05f70 | 18 | #include <linux/sched.h> |
77d8bf9c | 19 | #include <linux/slab.h> |
f3f05f70 | 20 | #include <linux/wait.h> |
095dc8e0 | 21 | #include <linux/vmalloc.h> |
57c8a661 | 22 | #include <linux/memblock.h> |
77d8bf9c | 23 | |
c125e80b | 24 | #include <net/addrconf.h> |
463c84b9 | 25 | #include <net/inet_connection_sock.h> |
77d8bf9c | 26 | #include <net/inet_hashtables.h> |
6e5714ea | 27 | #include <net/secure_seq.h> |
a7f5e7f1 | 28 | #include <net/ip.h> |
a04a480d | 29 | #include <net/tcp.h> |
c125e80b | 30 | #include <net/sock_reuseport.h> |
77d8bf9c | 31 | |
6eada011 ED |
32 | static u32 inet_ehashfn(const struct net *net, const __be32 laddr, |
33 | const __u16 lport, const __be32 faddr, | |
34 | const __be16 fport) | |
65cd8033 | 35 | { |
1bbdceef HFS |
36 | static u32 inet_ehash_secret __read_mostly; |
37 | ||
38 | net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret)); | |
39 | ||
65cd8033 HFS |
40 | return __inet_ehashfn(laddr, lport, faddr, fport, |
41 | inet_ehash_secret + net_hash_mix(net)); | |
42 | } | |
43 | ||
d1e559d0 ED |
44 | /* This function handles inet_sock, but also timewait and request sockets |
45 | * for IPv4/IPv6. | |
46 | */ | |
784c372a | 47 | static u32 sk_ehashfn(const struct sock *sk) |
65cd8033 | 48 | { |
d1e559d0 ED |
49 | #if IS_ENABLED(CONFIG_IPV6) |
50 | if (sk->sk_family == AF_INET6 && | |
51 | !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
52 | return inet6_ehashfn(sock_net(sk), | |
53 | &sk->sk_v6_rcv_saddr, sk->sk_num, | |
54 | &sk->sk_v6_daddr, sk->sk_dport); | |
55 | #endif | |
5b441f76 ED |
56 | return inet_ehashfn(sock_net(sk), |
57 | sk->sk_rcv_saddr, sk->sk_num, | |
58 | sk->sk_daddr, sk->sk_dport); | |
65cd8033 HFS |
59 | } |
60 | ||
77d8bf9c ACM |
61 | /* |
62 | * Allocate and initialize a new local port bind bucket. | |
63 | * The bindhash mutex for snum's hash chain must be held here. | |
64 | */ | |
e18b890b | 65 | struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep, |
941b1d22 | 66 | struct net *net, |
77d8bf9c | 67 | struct inet_bind_hashbucket *head, |
3c82a21f RS |
68 | const unsigned short snum, |
69 | int l3mdev) | |
77d8bf9c | 70 | { |
54e6ecb2 | 71 | struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC); |
77d8bf9c | 72 | |
00db4124 | 73 | if (tb) { |
efd7ef1c | 74 | write_pnet(&tb->ib_net, net); |
3c82a21f | 75 | tb->l3mdev = l3mdev; |
77d8bf9c ACM |
76 | tb->port = snum; |
77 | tb->fastreuse = 0; | |
da5e3630 | 78 | tb->fastreuseport = 0; |
77d8bf9c ACM |
79 | INIT_HLIST_HEAD(&tb->owners); |
80 | hlist_add_head(&tb->node, &head->chain); | |
81 | } | |
82 | return tb; | |
83 | } | |
84 | ||
77d8bf9c ACM |
85 | /* |
86 | * Caller must hold hashbucket lock for this tb with local BH disabled | |
87 | */ | |
e18b890b | 88 | void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb) |
77d8bf9c ACM |
89 | { |
90 | if (hlist_empty(&tb->owners)) { | |
91 | __hlist_del(&tb->node); | |
92 | kmem_cache_free(cachep, tb); | |
93 | } | |
94 | } | |
2d8c4ce5 ACM |
95 | |
96 | void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, | |
97 | const unsigned short snum) | |
98 | { | |
c720c7e8 | 99 | inet_sk(sk)->inet_num = snum; |
2d8c4ce5 | 100 | sk_add_bind_node(sk, &tb->owners); |
463c84b9 | 101 | inet_csk(sk)->icsk_bind_hash = tb; |
2d8c4ce5 ACM |
102 | } |
103 | ||
2d8c4ce5 ACM |
104 | /* |
105 | * Get rid of any references to a local port held by the given sock. | |
106 | */ | |
ab1e0a13 | 107 | static void __inet_put_port(struct sock *sk) |
2d8c4ce5 | 108 | { |
39d8cda7 | 109 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
c720c7e8 | 110 | const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num, |
7f635ab7 | 111 | hashinfo->bhash_size); |
2d8c4ce5 ACM |
112 | struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash]; |
113 | struct inet_bind_bucket *tb; | |
114 | ||
115 | spin_lock(&head->lock); | |
463c84b9 | 116 | tb = inet_csk(sk)->icsk_bind_hash; |
2d8c4ce5 | 117 | __sk_del_bind_node(sk); |
463c84b9 | 118 | inet_csk(sk)->icsk_bind_hash = NULL; |
c720c7e8 | 119 | inet_sk(sk)->inet_num = 0; |
2d8c4ce5 ACM |
120 | inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb); |
121 | spin_unlock(&head->lock); | |
122 | } | |
123 | ||
ab1e0a13 | 124 | void inet_put_port(struct sock *sk) |
2d8c4ce5 ACM |
125 | { |
126 | local_bh_disable(); | |
ab1e0a13 | 127 | __inet_put_port(sk); |
2d8c4ce5 ACM |
128 | local_bh_enable(); |
129 | } | |
2d8c4ce5 | 130 | EXPORT_SYMBOL(inet_put_port); |
f3f05f70 | 131 | |
1ce31c9e | 132 | int __inet_inherit_port(const struct sock *sk, struct sock *child) |
53083773 PE |
133 | { |
134 | struct inet_hashinfo *table = sk->sk_prot->h.hashinfo; | |
093d2823 BS |
135 | unsigned short port = inet_sk(child)->inet_num; |
136 | const int bhash = inet_bhashfn(sock_net(sk), port, | |
7f635ab7 | 137 | table->bhash_size); |
53083773 PE |
138 | struct inet_bind_hashbucket *head = &table->bhash[bhash]; |
139 | struct inet_bind_bucket *tb; | |
3c82a21f | 140 | int l3mdev; |
53083773 PE |
141 | |
142 | spin_lock(&head->lock); | |
143 | tb = inet_csk(sk)->icsk_bind_hash; | |
c2f34a65 ED |
144 | if (unlikely(!tb)) { |
145 | spin_unlock(&head->lock); | |
146 | return -ENOENT; | |
147 | } | |
093d2823 | 148 | if (tb->port != port) { |
3c82a21f RS |
149 | l3mdev = inet_sk_bound_l3mdev(sk); |
150 | ||
093d2823 BS |
151 | /* NOTE: using tproxy and redirecting skbs to a proxy |
152 | * on a different listener port breaks the assumption | |
153 | * that the listener socket's icsk_bind_hash is the same | |
154 | * as that of the child socket. We have to look up or | |
155 | * create a new bind bucket for the child here. */ | |
b67bfe0d | 156 | inet_bind_bucket_for_each(tb, &head->chain) { |
093d2823 | 157 | if (net_eq(ib_net(tb), sock_net(sk)) && |
3c82a21f | 158 | tb->l3mdev == l3mdev && tb->port == port) |
093d2823 BS |
159 | break; |
160 | } | |
b67bfe0d | 161 | if (!tb) { |
093d2823 | 162 | tb = inet_bind_bucket_create(table->bind_bucket_cachep, |
3c82a21f RS |
163 | sock_net(sk), head, port, |
164 | l3mdev); | |
093d2823 BS |
165 | if (!tb) { |
166 | spin_unlock(&head->lock); | |
167 | return -ENOMEM; | |
168 | } | |
169 | } | |
170 | } | |
b4ff3c90 | 171 | inet_bind_hash(child, tb, port); |
53083773 | 172 | spin_unlock(&head->lock); |
093d2823 BS |
173 | |
174 | return 0; | |
53083773 | 175 | } |
53083773 PE |
176 | EXPORT_SYMBOL_GPL(__inet_inherit_port); |
177 | ||
61b7c691 MKL |
178 | static struct inet_listen_hashbucket * |
179 | inet_lhash2_bucket_sk(struct inet_hashinfo *h, struct sock *sk) | |
180 | { | |
181 | u32 hash; | |
182 | ||
183 | #if IS_ENABLED(CONFIG_IPV6) | |
184 | if (sk->sk_family == AF_INET6) | |
185 | hash = ipv6_portaddr_hash(sock_net(sk), | |
186 | &sk->sk_v6_rcv_saddr, | |
187 | inet_sk(sk)->inet_num); | |
188 | else | |
189 | #endif | |
190 | hash = ipv4_portaddr_hash(sock_net(sk), | |
191 | inet_sk(sk)->inet_rcv_saddr, | |
192 | inet_sk(sk)->inet_num); | |
193 | return inet_lhash2_bucket(h, hash); | |
194 | } | |
195 | ||
196 | static void inet_hash2(struct inet_hashinfo *h, struct sock *sk) | |
197 | { | |
198 | struct inet_listen_hashbucket *ilb2; | |
199 | ||
200 | if (!h->lhash2) | |
201 | return; | |
202 | ||
203 | ilb2 = inet_lhash2_bucket_sk(h, sk); | |
204 | ||
205 | spin_lock(&ilb2->lock); | |
206 | if (sk->sk_reuseport && sk->sk_family == AF_INET6) | |
207 | hlist_add_tail_rcu(&inet_csk(sk)->icsk_listen_portaddr_node, | |
208 | &ilb2->head); | |
209 | else | |
210 | hlist_add_head_rcu(&inet_csk(sk)->icsk_listen_portaddr_node, | |
211 | &ilb2->head); | |
212 | ilb2->count++; | |
213 | spin_unlock(&ilb2->lock); | |
214 | } | |
215 | ||
216 | static void inet_unhash2(struct inet_hashinfo *h, struct sock *sk) | |
217 | { | |
218 | struct inet_listen_hashbucket *ilb2; | |
219 | ||
220 | if (!h->lhash2 || | |
221 | WARN_ON_ONCE(hlist_unhashed(&inet_csk(sk)->icsk_listen_portaddr_node))) | |
222 | return; | |
223 | ||
224 | ilb2 = inet_lhash2_bucket_sk(h, sk); | |
225 | ||
226 | spin_lock(&ilb2->lock); | |
227 | hlist_del_init_rcu(&inet_csk(sk)->icsk_listen_portaddr_node); | |
228 | ilb2->count--; | |
229 | spin_unlock(&ilb2->lock); | |
230 | } | |
231 | ||
c25eb3bf ED |
232 | static inline int compute_score(struct sock *sk, struct net *net, |
233 | const unsigned short hnum, const __be32 daddr, | |
3fa6f616 | 234 | const int dif, const int sdif, bool exact_dif) |
c25eb3bf ED |
235 | { |
236 | int score = -1; | |
c25eb3bf | 237 | |
d9fbc7f6 | 238 | if (net_eq(sock_net(sk), net) && sk->sk_num == hnum && |
c25eb3bf | 239 | !ipv6_only_sock(sk)) { |
d9fbc7f6 PO |
240 | if (sk->sk_rcv_saddr != daddr) |
241 | return -1; | |
242 | ||
243 | if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) | |
e7819058 | 244 | return -1; |
3fa6f616 | 245 | |
d9fbc7f6 | 246 | score = sk->sk_family == PF_INET ? 2 : 1; |
70da268b ED |
247 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
248 | score++; | |
c25eb3bf ED |
249 | } |
250 | return score; | |
251 | } | |
252 | ||
33b62231 | 253 | /* |
3b24d854 ED |
254 | * Here are some nice properties to exploit here. The BSD API |
255 | * does not allow a listening sock to specify the remote port nor the | |
33b62231 ACM |
256 | * remote address for the connection. So always assume those are both |
257 | * wildcarded during the search since they can never be otherwise. | |
258 | */ | |
e48c414e | 259 | |
3b24d854 | 260 | /* called with rcu_read_lock() : No refcount taken on the socket */ |
61b7c691 MKL |
261 | static struct sock *inet_lhash2_lookup(struct net *net, |
262 | struct inet_listen_hashbucket *ilb2, | |
263 | struct sk_buff *skb, int doff, | |
264 | const __be32 saddr, __be16 sport, | |
265 | const __be32 daddr, const unsigned short hnum, | |
266 | const int dif, const int sdif) | |
267 | { | |
268 | bool exact_dif = inet_exact_dif_match(net, skb); | |
269 | struct inet_connection_sock *icsk; | |
270 | struct sock *sk, *result = NULL; | |
271 | int score, hiscore = 0; | |
272 | u32 phash = 0; | |
273 | ||
274 | inet_lhash2_for_each_icsk_rcu(icsk, &ilb2->head) { | |
275 | sk = (struct sock *)icsk; | |
276 | score = compute_score(sk, net, hnum, daddr, | |
277 | dif, sdif, exact_dif); | |
278 | if (score > hiscore) { | |
279 | if (sk->sk_reuseport) { | |
280 | phash = inet_ehashfn(net, daddr, hnum, | |
281 | saddr, sport); | |
282 | result = reuseport_select_sock(sk, phash, | |
283 | skb, doff); | |
284 | if (result) | |
285 | return result; | |
286 | } | |
287 | result = sk; | |
288 | hiscore = score; | |
289 | } | |
290 | } | |
291 | ||
292 | return result; | |
293 | } | |
294 | ||
c67499c0 PE |
295 | struct sock *__inet_lookup_listener(struct net *net, |
296 | struct inet_hashinfo *hashinfo, | |
a583636a | 297 | struct sk_buff *skb, int doff, |
da5e3630 | 298 | const __be32 saddr, __be16 sport, |
fb99c848 | 299 | const __be32 daddr, const unsigned short hnum, |
3fa6f616 | 300 | const int dif, const int sdif) |
99a92ff5 | 301 | { |
61b7c691 | 302 | struct inet_listen_hashbucket *ilb2; |
d9fbc7f6 | 303 | struct sock *result = NULL; |
61b7c691 | 304 | unsigned int hash2; |
61b7c691 MKL |
305 | |
306 | hash2 = ipv4_portaddr_hash(net, daddr, hnum); | |
307 | ilb2 = inet_lhash2_bucket(hashinfo, hash2); | |
61b7c691 MKL |
308 | |
309 | result = inet_lhash2_lookup(net, ilb2, skb, doff, | |
310 | saddr, sport, daddr, hnum, | |
311 | dif, sdif); | |
312 | if (result) | |
8217ca65 | 313 | goto done; |
61b7c691 MKL |
314 | |
315 | /* Lookup lhash2 with INADDR_ANY */ | |
61b7c691 MKL |
316 | hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
317 | ilb2 = inet_lhash2_bucket(hashinfo, hash2); | |
61b7c691 | 318 | |
8217ca65 | 319 | result = inet_lhash2_lookup(net, ilb2, skb, doff, |
d9fbc7f6 | 320 | saddr, sport, htonl(INADDR_ANY), hnum, |
8217ca65 | 321 | dif, sdif); |
8217ca65 MKL |
322 | done: |
323 | if (unlikely(IS_ERR(result))) | |
324 | return NULL; | |
c25eb3bf | 325 | return result; |
99a92ff5 | 326 | } |
8f491069 | 327 | EXPORT_SYMBOL_GPL(__inet_lookup_listener); |
a7f5e7f1 | 328 | |
05dbc7b5 ED |
329 | /* All sockets share common refcount, but have different destructors */ |
330 | void sock_gen_put(struct sock *sk) | |
331 | { | |
41c6d650 | 332 | if (!refcount_dec_and_test(&sk->sk_refcnt)) |
05dbc7b5 ED |
333 | return; |
334 | ||
335 | if (sk->sk_state == TCP_TIME_WAIT) | |
336 | inet_twsk_free(inet_twsk(sk)); | |
41b822c5 ED |
337 | else if (sk->sk_state == TCP_NEW_SYN_RECV) |
338 | reqsk_free(inet_reqsk(sk)); | |
05dbc7b5 ED |
339 | else |
340 | sk_free(sk); | |
341 | } | |
342 | EXPORT_SYMBOL_GPL(sock_gen_put); | |
343 | ||
2c13270b ED |
344 | void sock_edemux(struct sk_buff *skb) |
345 | { | |
346 | sock_gen_put(skb->sk); | |
347 | } | |
348 | EXPORT_SYMBOL(sock_edemux); | |
349 | ||
5e73ea1a | 350 | struct sock *__inet_lookup_established(struct net *net, |
c67499c0 | 351 | struct inet_hashinfo *hashinfo, |
77a5ba55 PE |
352 | const __be32 saddr, const __be16 sport, |
353 | const __be32 daddr, const u16 hnum, | |
3fa6f616 | 354 | const int dif, const int sdif) |
77a5ba55 | 355 | { |
c7228317 | 356 | INET_ADDR_COOKIE(acookie, saddr, daddr); |
77a5ba55 PE |
357 | const __portpair ports = INET_COMBINED_PORTS(sport, hnum); |
358 | struct sock *sk; | |
3ab5aee7 | 359 | const struct hlist_nulls_node *node; |
77a5ba55 PE |
360 | /* Optimize here for direct hit, only listening connections can |
361 | * have wildcards anyways. | |
362 | */ | |
9f26b3ad | 363 | unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport); |
f373b53b | 364 | unsigned int slot = hash & hashinfo->ehash_mask; |
3ab5aee7 | 365 | struct inet_ehash_bucket *head = &hashinfo->ehash[slot]; |
77a5ba55 | 366 | |
3ab5aee7 ED |
367 | begin: |
368 | sk_nulls_for_each_rcu(sk, node, &head->chain) { | |
ce43b03e ED |
369 | if (sk->sk_hash != hash) |
370 | continue; | |
371 | if (likely(INET_MATCH(sk, net, acookie, | |
3fa6f616 | 372 | saddr, daddr, ports, dif, sdif))) { |
41c6d650 | 373 | if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) |
05dbc7b5 | 374 | goto out; |
ce43b03e | 375 | if (unlikely(!INET_MATCH(sk, net, acookie, |
3fa6f616 DA |
376 | saddr, daddr, ports, |
377 | dif, sdif))) { | |
05dbc7b5 | 378 | sock_gen_put(sk); |
3ab5aee7 ED |
379 | goto begin; |
380 | } | |
05dbc7b5 | 381 | goto found; |
3ab5aee7 | 382 | } |
77a5ba55 | 383 | } |
3ab5aee7 ED |
384 | /* |
385 | * if the nulls value we got at the end of this lookup is | |
386 | * not the expected one, we must restart lookup. | |
387 | * We probably met an item that was moved to another chain. | |
388 | */ | |
389 | if (get_nulls_value(node) != slot) | |
390 | goto begin; | |
77a5ba55 | 391 | out: |
05dbc7b5 ED |
392 | sk = NULL; |
393 | found: | |
77a5ba55 | 394 | return sk; |
77a5ba55 PE |
395 | } |
396 | EXPORT_SYMBOL_GPL(__inet_lookup_established); | |
397 | ||
a7f5e7f1 ACM |
398 | /* called with local bh disabled */ |
399 | static int __inet_check_established(struct inet_timewait_death_row *death_row, | |
400 | struct sock *sk, __u16 lport, | |
401 | struct inet_timewait_sock **twp) | |
402 | { | |
403 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
404 | struct inet_sock *inet = inet_sk(sk); | |
c720c7e8 ED |
405 | __be32 daddr = inet->inet_rcv_saddr; |
406 | __be32 saddr = inet->inet_daddr; | |
a7f5e7f1 | 407 | int dif = sk->sk_bound_dev_if; |
3fa6f616 DA |
408 | struct net *net = sock_net(sk); |
409 | int sdif = l3mdev_master_ifindex_by_index(net, dif); | |
c7228317 | 410 | INET_ADDR_COOKIE(acookie, saddr, daddr); |
c720c7e8 | 411 | const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport); |
c720c7e8 ED |
412 | unsigned int hash = inet_ehashfn(net, daddr, lport, |
413 | saddr, inet->inet_dport); | |
a7f5e7f1 | 414 | struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash); |
9db66bdc | 415 | spinlock_t *lock = inet_ehash_lockp(hinfo, hash); |
a7f5e7f1 | 416 | struct sock *sk2; |
3ab5aee7 | 417 | const struct hlist_nulls_node *node; |
05dbc7b5 | 418 | struct inet_timewait_sock *tw = NULL; |
a7f5e7f1 | 419 | |
9db66bdc | 420 | spin_lock(lock); |
a7f5e7f1 | 421 | |
3ab5aee7 | 422 | sk_nulls_for_each(sk2, node, &head->chain) { |
ce43b03e ED |
423 | if (sk2->sk_hash != hash) |
424 | continue; | |
05dbc7b5 | 425 | |
ce43b03e | 426 | if (likely(INET_MATCH(sk2, net, acookie, |
3fa6f616 | 427 | saddr, daddr, ports, dif, sdif))) { |
05dbc7b5 ED |
428 | if (sk2->sk_state == TCP_TIME_WAIT) { |
429 | tw = inet_twsk(sk2); | |
430 | if (twsk_unique(sk, sk2, twp)) | |
431 | break; | |
432 | } | |
a7f5e7f1 | 433 | goto not_unique; |
05dbc7b5 | 434 | } |
a7f5e7f1 ACM |
435 | } |
436 | ||
a7f5e7f1 | 437 | /* Must record num and sport now. Otherwise we will see |
05dbc7b5 ED |
438 | * in hash table socket with a funny identity. |
439 | */ | |
c720c7e8 ED |
440 | inet->inet_num = lport; |
441 | inet->inet_sport = htons(lport); | |
a7f5e7f1 | 442 | sk->sk_hash = hash; |
547b792c | 443 | WARN_ON(!sk_unhashed(sk)); |
3ab5aee7 | 444 | __sk_nulls_add_node_rcu(sk, &head->chain); |
13475a30 | 445 | if (tw) { |
fc01538f | 446 | sk_nulls_del_node_init_rcu((struct sock *)tw); |
02a1d6e7 | 447 | __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED); |
13475a30 | 448 | } |
9db66bdc | 449 | spin_unlock(lock); |
c29a0bc4 | 450 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
a7f5e7f1 ACM |
451 | |
452 | if (twp) { | |
453 | *twp = tw; | |
a7f5e7f1 ACM |
454 | } else if (tw) { |
455 | /* Silly. Should hash-dance instead... */ | |
dbe7faa4 | 456 | inet_twsk_deschedule_put(tw); |
a7f5e7f1 | 457 | } |
a7f5e7f1 ACM |
458 | return 0; |
459 | ||
460 | not_unique: | |
9db66bdc | 461 | spin_unlock(lock); |
a7f5e7f1 ACM |
462 | return -EADDRNOTAVAIL; |
463 | } | |
464 | ||
e2baad9e | 465 | static u32 inet_sk_port_offset(const struct sock *sk) |
a7f5e7f1 ACM |
466 | { |
467 | const struct inet_sock *inet = inet_sk(sk); | |
e2baad9e | 468 | |
c720c7e8 ED |
469 | return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr, |
470 | inet->inet_daddr, | |
471 | inet->inet_dport); | |
a7f5e7f1 ACM |
472 | } |
473 | ||
079096f1 ED |
474 | /* insert a socket into ehash, and eventually remove another one |
475 | * (The another one can be a SYN_RECV or TIMEWAIT | |
476 | */ | |
5e0724d0 | 477 | bool inet_ehash_insert(struct sock *sk, struct sock *osk) |
152da81d | 478 | { |
39d8cda7 | 479 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
3ab5aee7 | 480 | struct hlist_nulls_head *list; |
152da81d | 481 | struct inet_ehash_bucket *head; |
5b441f76 | 482 | spinlock_t *lock; |
5e0724d0 | 483 | bool ret = true; |
152da81d | 484 | |
079096f1 | 485 | WARN_ON_ONCE(!sk_unhashed(sk)); |
152da81d | 486 | |
5b441f76 | 487 | sk->sk_hash = sk_ehashfn(sk); |
152da81d PE |
488 | head = inet_ehash_bucket(hashinfo, sk->sk_hash); |
489 | list = &head->chain; | |
490 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); | |
491 | ||
9db66bdc | 492 | spin_lock(lock); |
fc01538f | 493 | if (osk) { |
5e0724d0 ED |
494 | WARN_ON_ONCE(sk->sk_hash != osk->sk_hash); |
495 | ret = sk_nulls_del_node_init_rcu(osk); | |
9327f705 | 496 | } |
5e0724d0 ED |
497 | if (ret) |
498 | __sk_nulls_add_node_rcu(sk, list); | |
9db66bdc | 499 | spin_unlock(lock); |
079096f1 ED |
500 | return ret; |
501 | } | |
502 | ||
5e0724d0 | 503 | bool inet_ehash_nolisten(struct sock *sk, struct sock *osk) |
079096f1 | 504 | { |
5e0724d0 ED |
505 | bool ok = inet_ehash_insert(sk, osk); |
506 | ||
507 | if (ok) { | |
508 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
509 | } else { | |
510 | percpu_counter_inc(sk->sk_prot->orphan_count); | |
563e0bb0 | 511 | inet_sk_set_state(sk, TCP_CLOSE); |
5e0724d0 ED |
512 | sock_set_flag(sk, SOCK_DEAD); |
513 | inet_csk_destroy_sock(sk); | |
514 | } | |
515 | return ok; | |
152da81d | 516 | } |
5e0724d0 | 517 | EXPORT_SYMBOL_GPL(inet_ehash_nolisten); |
152da81d | 518 | |
c125e80b | 519 | static int inet_reuseport_add_sock(struct sock *sk, |
fe38d2a1 | 520 | struct inet_listen_hashbucket *ilb) |
c125e80b | 521 | { |
90e5d0db | 522 | struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash; |
c125e80b | 523 | struct sock *sk2; |
c125e80b CG |
524 | kuid_t uid = sock_i_uid(sk); |
525 | ||
85017869 | 526 | sk_for_each_rcu(sk2, &ilb->head) { |
c125e80b CG |
527 | if (sk2 != sk && |
528 | sk2->sk_family == sk->sk_family && | |
529 | ipv6_only_sock(sk2) == ipv6_only_sock(sk) && | |
530 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if && | |
90e5d0db | 531 | inet_csk(sk2)->icsk_bind_hash == tb && |
c125e80b | 532 | sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && |
fe38d2a1 | 533 | inet_rcv_saddr_equal(sk, sk2, false)) |
2dbb9b9e MKL |
534 | return reuseport_add_sock(sk, sk2, |
535 | inet_rcv_saddr_any(sk)); | |
c125e80b CG |
536 | } |
537 | ||
2dbb9b9e | 538 | return reuseport_alloc(sk, inet_rcv_saddr_any(sk)); |
c125e80b CG |
539 | } |
540 | ||
fe38d2a1 | 541 | int __inet_hash(struct sock *sk, struct sock *osk) |
152da81d | 542 | { |
39d8cda7 | 543 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
5caea4ea | 544 | struct inet_listen_hashbucket *ilb; |
c125e80b | 545 | int err = 0; |
152da81d | 546 | |
5e0724d0 ED |
547 | if (sk->sk_state != TCP_LISTEN) { |
548 | inet_ehash_nolisten(sk, osk); | |
c125e80b | 549 | return 0; |
5e0724d0 | 550 | } |
547b792c | 551 | WARN_ON(!sk_unhashed(sk)); |
5caea4ea | 552 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
152da81d | 553 | |
5caea4ea | 554 | spin_lock(&ilb->lock); |
c125e80b | 555 | if (sk->sk_reuseport) { |
fe38d2a1 | 556 | err = inet_reuseport_add_sock(sk, ilb); |
c125e80b CG |
557 | if (err) |
558 | goto unlock; | |
559 | } | |
d296ba60 CG |
560 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
561 | sk->sk_family == AF_INET6) | |
562 | hlist_add_tail_rcu(&sk->sk_node, &ilb->head); | |
563 | else | |
564 | hlist_add_head_rcu(&sk->sk_node, &ilb->head); | |
61b7c691 | 565 | inet_hash2(hashinfo, sk); |
76d013b2 | 566 | ilb->count++; |
3b24d854 | 567 | sock_set_flag(sk, SOCK_RCU_FREE); |
c29a0bc4 | 568 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
c125e80b | 569 | unlock: |
5caea4ea | 570 | spin_unlock(&ilb->lock); |
c125e80b CG |
571 | |
572 | return err; | |
152da81d | 573 | } |
77a6a471 | 574 | EXPORT_SYMBOL(__inet_hash); |
ab1e0a13 | 575 | |
086c653f | 576 | int inet_hash(struct sock *sk) |
ab1e0a13 | 577 | { |
c125e80b CG |
578 | int err = 0; |
579 | ||
ab1e0a13 ACM |
580 | if (sk->sk_state != TCP_CLOSE) { |
581 | local_bh_disable(); | |
fe38d2a1 | 582 | err = __inet_hash(sk, NULL); |
ab1e0a13 ACM |
583 | local_bh_enable(); |
584 | } | |
086c653f | 585 | |
c125e80b | 586 | return err; |
ab1e0a13 ACM |
587 | } |
588 | EXPORT_SYMBOL_GPL(inet_hash); | |
589 | ||
590 | void inet_unhash(struct sock *sk) | |
591 | { | |
39d8cda7 | 592 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
0ba98718 | 593 | struct inet_listen_hashbucket *ilb = NULL; |
c25eb3bf | 594 | spinlock_t *lock; |
ab1e0a13 ACM |
595 | |
596 | if (sk_unhashed(sk)) | |
5caea4ea | 597 | return; |
ab1e0a13 | 598 | |
3b24d854 | 599 | if (sk->sk_state == TCP_LISTEN) { |
76d013b2 MKL |
600 | ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)]; |
601 | lock = &ilb->lock; | |
3b24d854 | 602 | } else { |
c25eb3bf | 603 | lock = inet_ehash_lockp(hashinfo, sk->sk_hash); |
3b24d854 | 604 | } |
c25eb3bf | 605 | spin_lock_bh(lock); |
61b7c691 MKL |
606 | if (sk_unhashed(sk)) |
607 | goto unlock; | |
608 | ||
c125e80b CG |
609 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
610 | reuseport_detach_sock(sk); | |
0ba98718 | 611 | if (ilb) { |
61b7c691 MKL |
612 | inet_unhash2(hashinfo, sk); |
613 | __sk_del_node_init(sk); | |
614 | ilb->count--; | |
615 | } else { | |
616 | __sk_nulls_del_node_init_rcu(sk); | |
76d013b2 | 617 | } |
61b7c691 MKL |
618 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
619 | unlock: | |
920de804 | 620 | spin_unlock_bh(lock); |
ab1e0a13 ACM |
621 | } |
622 | EXPORT_SYMBOL_GPL(inet_unhash); | |
152da81d | 623 | |
5ee31fc1 | 624 | int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
5d8c0aa9 | 625 | struct sock *sk, u32 port_offset, |
5ee31fc1 | 626 | int (*check_established)(struct inet_timewait_death_row *, |
b4d6444e | 627 | struct sock *, __u16, struct inet_timewait_sock **)) |
a7f5e7f1 ACM |
628 | { |
629 | struct inet_hashinfo *hinfo = death_row->hashinfo; | |
1580ab63 | 630 | struct inet_timewait_sock *tw = NULL; |
e905a9ed | 631 | struct inet_bind_hashbucket *head; |
1580ab63 | 632 | int port = inet_sk(sk)->inet_num; |
3b1e0a65 | 633 | struct net *net = sock_net(sk); |
1580ab63 ED |
634 | struct inet_bind_bucket *tb; |
635 | u32 remaining, offset; | |
636 | int ret, i, low, high; | |
637 | static u32 hint; | |
3c82a21f | 638 | int l3mdev; |
1580ab63 ED |
639 | |
640 | if (port) { | |
641 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
642 | hinfo->bhash_size)]; | |
643 | tb = inet_csk(sk)->icsk_bind_hash; | |
644 | spin_lock_bh(&head->lock); | |
645 | if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) { | |
646 | inet_ehash_nolisten(sk, NULL); | |
647 | spin_unlock_bh(&head->lock); | |
648 | return 0; | |
649 | } | |
650 | spin_unlock(&head->lock); | |
651 | /* No definite answer... Walk to established hash table */ | |
652 | ret = check_established(death_row, sk, port, NULL); | |
653 | local_bh_enable(); | |
654 | return ret; | |
655 | } | |
a7f5e7f1 | 656 | |
3c82a21f RS |
657 | l3mdev = inet_sk_bound_l3mdev(sk); |
658 | ||
1580ab63 ED |
659 | inet_get_local_port_range(net, &low, &high); |
660 | high++; /* [32768, 60999] -> [32768, 61000[ */ | |
661 | remaining = high - low; | |
662 | if (likely(remaining > 1)) | |
663 | remaining &= ~1U; | |
a7f5e7f1 | 664 | |
1580ab63 ED |
665 | offset = (hint + port_offset) % remaining; |
666 | /* In first pass we try ports of @low parity. | |
667 | * inet_csk_get_port() does the opposite choice. | |
668 | */ | |
669 | offset &= ~1U; | |
670 | other_parity_scan: | |
671 | port = low + offset; | |
672 | for (i = 0; i < remaining; i += 2, port += 2) { | |
673 | if (unlikely(port >= high)) | |
674 | port -= remaining; | |
675 | if (inet_is_local_reserved_port(net, port)) | |
676 | continue; | |
677 | head = &hinfo->bhash[inet_bhashfn(net, port, | |
678 | hinfo->bhash_size)]; | |
679 | spin_lock_bh(&head->lock); | |
227b60f5 | 680 | |
1580ab63 ED |
681 | /* Does not bother with rcv_saddr checks, because |
682 | * the established check is already unique enough. | |
07f4c900 | 683 | */ |
1580ab63 | 684 | inet_bind_bucket_for_each(tb, &head->chain) { |
3c82a21f RS |
685 | if (net_eq(ib_net(tb), net) && tb->l3mdev == l3mdev && |
686 | tb->port == port) { | |
1580ab63 ED |
687 | if (tb->fastreuse >= 0 || |
688 | tb->fastreuseport >= 0) | |
e905a9ed | 689 | goto next_port; |
1580ab63 ED |
690 | WARN_ON(hlist_empty(&tb->owners)); |
691 | if (!check_established(death_row, sk, | |
692 | port, &tw)) | |
693 | goto ok; | |
694 | goto next_port; | |
e905a9ed | 695 | } |
e905a9ed | 696 | } |
a7f5e7f1 | 697 | |
1580ab63 | 698 | tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep, |
3c82a21f | 699 | net, head, port, l3mdev); |
1580ab63 ED |
700 | if (!tb) { |
701 | spin_unlock_bh(&head->lock); | |
702 | return -ENOMEM; | |
e905a9ed | 703 | } |
1580ab63 ED |
704 | tb->fastreuse = -1; |
705 | tb->fastreuseport = -1; | |
706 | goto ok; | |
707 | next_port: | |
708 | spin_unlock_bh(&head->lock); | |
709 | cond_resched(); | |
710 | } | |
a7f5e7f1 | 711 | |
1580ab63 ED |
712 | offset++; |
713 | if ((offset & 1) && remaining > 1) | |
714 | goto other_parity_scan; | |
a7f5e7f1 | 715 | |
1580ab63 | 716 | return -EADDRNOTAVAIL; |
a7f5e7f1 | 717 | |
1580ab63 ED |
718 | ok: |
719 | hint += i + 2; | |
720 | ||
721 | /* Head lock still held and bh's disabled */ | |
722 | inet_bind_hash(sk, tb, port); | |
723 | if (sk_unhashed(sk)) { | |
724 | inet_sk(sk)->inet_sport = htons(port); | |
725 | inet_ehash_nolisten(sk, (struct sock *)tw); | |
a7f5e7f1 | 726 | } |
1580ab63 ED |
727 | if (tw) |
728 | inet_twsk_bind_unhash(tw, hinfo); | |
729 | spin_unlock(&head->lock); | |
730 | if (tw) | |
731 | inet_twsk_deschedule_put(tw); | |
732 | local_bh_enable(); | |
733 | return 0; | |
a7f5e7f1 | 734 | } |
5ee31fc1 PE |
735 | |
736 | /* | |
737 | * Bind a port for a connect operation and hash it. | |
738 | */ | |
739 | int inet_hash_connect(struct inet_timewait_death_row *death_row, | |
740 | struct sock *sk) | |
741 | { | |
e2baad9e ED |
742 | u32 port_offset = 0; |
743 | ||
744 | if (!inet_sk(sk)->inet_num) | |
745 | port_offset = inet_sk_port_offset(sk); | |
746 | return __inet_hash_connect(death_row, sk, port_offset, | |
b4d6444e | 747 | __inet_check_established); |
5ee31fc1 | 748 | } |
a7f5e7f1 | 749 | EXPORT_SYMBOL_GPL(inet_hash_connect); |
5caea4ea ED |
750 | |
751 | void inet_hashinfo_init(struct inet_hashinfo *h) | |
752 | { | |
753 | int i; | |
754 | ||
c25eb3bf | 755 | for (i = 0; i < INET_LHTABLE_SIZE; i++) { |
5caea4ea | 756 | spin_lock_init(&h->listening_hash[i].lock); |
3b24d854 | 757 | INIT_HLIST_HEAD(&h->listening_hash[i].head); |
76d013b2 | 758 | h->listening_hash[i].count = 0; |
3b24d854 | 759 | } |
61b7c691 MKL |
760 | |
761 | h->lhash2 = NULL; | |
5caea4ea | 762 | } |
5caea4ea | 763 | EXPORT_SYMBOL_GPL(inet_hashinfo_init); |
095dc8e0 | 764 | |
c92c81df PO |
765 | static void init_hashinfo_lhash2(struct inet_hashinfo *h) |
766 | { | |
767 | int i; | |
768 | ||
769 | for (i = 0; i <= h->lhash2_mask; i++) { | |
770 | spin_lock_init(&h->lhash2[i].lock); | |
771 | INIT_HLIST_HEAD(&h->lhash2[i].head); | |
772 | h->lhash2[i].count = 0; | |
773 | } | |
774 | } | |
775 | ||
61b7c691 MKL |
776 | void __init inet_hashinfo2_init(struct inet_hashinfo *h, const char *name, |
777 | unsigned long numentries, int scale, | |
778 | unsigned long low_limit, | |
779 | unsigned long high_limit) | |
780 | { | |
61b7c691 MKL |
781 | h->lhash2 = alloc_large_system_hash(name, |
782 | sizeof(*h->lhash2), | |
783 | numentries, | |
784 | scale, | |
785 | 0, | |
786 | NULL, | |
787 | &h->lhash2_mask, | |
788 | low_limit, | |
789 | high_limit); | |
c92c81df PO |
790 | init_hashinfo_lhash2(h); |
791 | } | |
61b7c691 | 792 | |
c92c81df PO |
793 | int inet_hashinfo2_init_mod(struct inet_hashinfo *h) |
794 | { | |
795 | h->lhash2 = kmalloc_array(INET_LHTABLE_SIZE, sizeof(*h->lhash2), GFP_KERNEL); | |
796 | if (!h->lhash2) | |
797 | return -ENOMEM; | |
798 | ||
799 | h->lhash2_mask = INET_LHTABLE_SIZE - 1; | |
800 | /* INET_LHTABLE_SIZE must be a power of 2 */ | |
801 | BUG_ON(INET_LHTABLE_SIZE & h->lhash2_mask); | |
802 | ||
803 | init_hashinfo_lhash2(h); | |
804 | return 0; | |
61b7c691 | 805 | } |
c92c81df | 806 | EXPORT_SYMBOL_GPL(inet_hashinfo2_init_mod); |
61b7c691 | 807 | |
095dc8e0 ED |
808 | int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo) |
809 | { | |
89e478a2 | 810 | unsigned int locksz = sizeof(spinlock_t); |
095dc8e0 ED |
811 | unsigned int i, nblocks = 1; |
812 | ||
89e478a2 | 813 | if (locksz != 0) { |
095dc8e0 | 814 | /* allocate 2 cache lines or at least one spinlock per cpu */ |
89e478a2 | 815 | nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U); |
095dc8e0 ED |
816 | nblocks = roundup_pow_of_two(nblocks * num_possible_cpus()); |
817 | ||
818 | /* no more locks than number of hash buckets */ | |
819 | nblocks = min(nblocks, hashinfo->ehash_mask + 1); | |
820 | ||
752ade68 | 821 | hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL); |
095dc8e0 ED |
822 | if (!hashinfo->ehash_locks) |
823 | return -ENOMEM; | |
824 | ||
825 | for (i = 0; i < nblocks; i++) | |
826 | spin_lock_init(&hashinfo->ehash_locks[i]); | |
827 | } | |
828 | hashinfo->ehash_locks_mask = nblocks - 1; | |
829 | return 0; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc); |