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TOMOYO Linux Cross Reference
Linux/net/ipv4/inet_hashtables.c

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  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 
 16 #include <linux/module.h>
 17 #include <linux/random.h>
 18 #include <linux/sched.h>
 19 #include <linux/slab.h>
 20 #include <linux/wait.h>
 21 
 22 #include <net/inet_connection_sock.h>
 23 #include <net/inet_hashtables.h>
 24 #include <net/secure_seq.h>
 25 #include <net/ip.h>
 26 
 27 static unsigned int inet_ehashfn(struct net *net, const __be32 laddr,
 28                                  const __u16 lport, const __be32 faddr,
 29                                  const __be16 fport)
 30 {
 31         static u32 inet_ehash_secret __read_mostly;
 32 
 33         net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
 34 
 35         return __inet_ehashfn(laddr, lport, faddr, fport,
 36                               inet_ehash_secret + net_hash_mix(net));
 37 }
 38 
 39 
 40 static unsigned int inet_sk_ehashfn(const struct sock *sk)
 41 {
 42         const struct inet_sock *inet = inet_sk(sk);
 43         const __be32 laddr = inet->inet_rcv_saddr;
 44         const __u16 lport = inet->inet_num;
 45         const __be32 faddr = inet->inet_daddr;
 46         const __be16 fport = inet->inet_dport;
 47         struct net *net = sock_net(sk);
 48 
 49         return inet_ehashfn(net, laddr, lport, faddr, fport);
 50 }
 51 
 52 /*
 53  * Allocate and initialize a new local port bind bucket.
 54  * The bindhash mutex for snum's hash chain must be held here.
 55  */
 56 struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
 57                                                  struct net *net,
 58                                                  struct inet_bind_hashbucket *head,
 59                                                  const unsigned short snum)
 60 {
 61         struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
 62 
 63         if (tb != NULL) {
 64                 write_pnet(&tb->ib_net, hold_net(net));
 65                 tb->port      = snum;
 66                 tb->fastreuse = 0;
 67                 tb->fastreuseport = 0;
 68                 tb->num_owners = 0;
 69                 INIT_HLIST_HEAD(&tb->owners);
 70                 hlist_add_head(&tb->node, &head->chain);
 71         }
 72         return tb;
 73 }
 74 
 75 /*
 76  * Caller must hold hashbucket lock for this tb with local BH disabled
 77  */
 78 void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
 79 {
 80         if (hlist_empty(&tb->owners)) {
 81                 __hlist_del(&tb->node);
 82                 release_net(ib_net(tb));
 83                 kmem_cache_free(cachep, tb);
 84         }
 85 }
 86 
 87 void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
 88                     const unsigned short snum)
 89 {
 90         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
 91 
 92         atomic_inc(&hashinfo->bsockets);
 93 
 94         inet_sk(sk)->inet_num = snum;
 95         sk_add_bind_node(sk, &tb->owners);
 96         tb->num_owners++;
 97         inet_csk(sk)->icsk_bind_hash = tb;
 98 }
 99 
100 /*
101  * Get rid of any references to a local port held by the given sock.
102  */
103 static void __inet_put_port(struct sock *sk)
104 {
105         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
106         const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
107                         hashinfo->bhash_size);
108         struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
109         struct inet_bind_bucket *tb;
110 
111         atomic_dec(&hashinfo->bsockets);
112 
113         spin_lock(&head->lock);
114         tb = inet_csk(sk)->icsk_bind_hash;
115         __sk_del_bind_node(sk);
116         tb->num_owners--;
117         inet_csk(sk)->icsk_bind_hash = NULL;
118         inet_sk(sk)->inet_num = 0;
119         inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
120         spin_unlock(&head->lock);
121 }
122 
123 void inet_put_port(struct sock *sk)
124 {
125         local_bh_disable();
126         __inet_put_port(sk);
127         local_bh_enable();
128 }
129 EXPORT_SYMBOL(inet_put_port);
130 
131 int __inet_inherit_port(struct sock *sk, struct sock *child)
132 {
133         struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
134         unsigned short port = inet_sk(child)->inet_num;
135         const int bhash = inet_bhashfn(sock_net(sk), port,
136                         table->bhash_size);
137         struct inet_bind_hashbucket *head = &table->bhash[bhash];
138         struct inet_bind_bucket *tb;
139 
140         spin_lock(&head->lock);
141         tb = inet_csk(sk)->icsk_bind_hash;
142         if (tb->port != port) {
143                 /* NOTE: using tproxy and redirecting skbs to a proxy
144                  * on a different listener port breaks the assumption
145                  * that the listener socket's icsk_bind_hash is the same
146                  * as that of the child socket. We have to look up or
147                  * create a new bind bucket for the child here. */
148                 inet_bind_bucket_for_each(tb, &head->chain) {
149                         if (net_eq(ib_net(tb), sock_net(sk)) &&
150                             tb->port == port)
151                                 break;
152                 }
153                 if (!tb) {
154                         tb = inet_bind_bucket_create(table->bind_bucket_cachep,
155                                                      sock_net(sk), head, port);
156                         if (!tb) {
157                                 spin_unlock(&head->lock);
158                                 return -ENOMEM;
159                         }
160                 }
161         }
162         inet_bind_hash(child, tb, port);
163         spin_unlock(&head->lock);
164 
165         return 0;
166 }
167 EXPORT_SYMBOL_GPL(__inet_inherit_port);
168 
169 static inline int compute_score(struct sock *sk, struct net *net,
170                                 const unsigned short hnum, const __be32 daddr,
171                                 const int dif)
172 {
173         int score = -1;
174         struct inet_sock *inet = inet_sk(sk);
175 
176         if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
177                         !ipv6_only_sock(sk)) {
178                 __be32 rcv_saddr = inet->inet_rcv_saddr;
179                 score = sk->sk_family == PF_INET ? 2 : 1;
180                 if (rcv_saddr) {
181                         if (rcv_saddr != daddr)
182                                 return -1;
183                         score += 4;
184                 }
185                 if (sk->sk_bound_dev_if) {
186                         if (sk->sk_bound_dev_if != dif)
187                                 return -1;
188                         score += 4;
189                 }
190         }
191         return score;
192 }
193 
194 /*
195  * Don't inline this cruft. Here are some nice properties to exploit here. The
196  * BSD API does not allow a listening sock to specify the remote port nor the
197  * remote address for the connection. So always assume those are both
198  * wildcarded during the search since they can never be otherwise.
199  */
200 
201 
202 struct sock *__inet_lookup_listener(struct net *net,
203                                     struct inet_hashinfo *hashinfo,
204                                     const __be32 saddr, __be16 sport,
205                                     const __be32 daddr, const unsigned short hnum,
206                                     const int dif)
207 {
208         struct sock *sk, *result;
209         struct hlist_nulls_node *node;
210         unsigned int hash = inet_lhashfn(net, hnum);
211         struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
212         int score, hiscore, matches = 0, reuseport = 0;
213         u32 phash = 0;
214 
215         rcu_read_lock();
216 begin:
217         result = NULL;
218         hiscore = 0;
219         sk_nulls_for_each_rcu(sk, node, &ilb->head) {
220                 score = compute_score(sk, net, hnum, daddr, dif);
221                 if (score > hiscore) {
222                         result = sk;
223                         hiscore = score;
224                         reuseport = sk->sk_reuseport;
225                         if (reuseport) {
226                                 phash = inet_ehashfn(net, daddr, hnum,
227                                                      saddr, sport);
228                                 matches = 1;
229                         }
230                 } else if (score == hiscore && reuseport) {
231                         matches++;
232                         if (((u64)phash * matches) >> 32 == 0)
233                                 result = sk;
234                         phash = next_pseudo_random32(phash);
235                 }
236         }
237         /*
238          * if the nulls value we got at the end of this lookup is
239          * not the expected one, we must restart lookup.
240          * We probably met an item that was moved to another chain.
241          */
242         if (get_nulls_value(node) != hash + LISTENING_NULLS_BASE)
243                 goto begin;
244         if (result) {
245                 if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
246                         result = NULL;
247                 else if (unlikely(compute_score(result, net, hnum, daddr,
248                                   dif) < hiscore)) {
249                         sock_put(result);
250                         goto begin;
251                 }
252         }
253         rcu_read_unlock();
254         return result;
255 }
256 EXPORT_SYMBOL_GPL(__inet_lookup_listener);
257 
258 /* All sockets share common refcount, but have different destructors */
259 void sock_gen_put(struct sock *sk)
260 {
261         if (!atomic_dec_and_test(&sk->sk_refcnt))
262                 return;
263 
264         if (sk->sk_state == TCP_TIME_WAIT)
265                 inet_twsk_free(inet_twsk(sk));
266         else
267                 sk_free(sk);
268 }
269 EXPORT_SYMBOL_GPL(sock_gen_put);
270 
271 struct sock *__inet_lookup_established(struct net *net,
272                                   struct inet_hashinfo *hashinfo,
273                                   const __be32 saddr, const __be16 sport,
274                                   const __be32 daddr, const u16 hnum,
275                                   const int dif)
276 {
277         INET_ADDR_COOKIE(acookie, saddr, daddr);
278         const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
279         struct sock *sk;
280         const struct hlist_nulls_node *node;
281         /* Optimize here for direct hit, only listening connections can
282          * have wildcards anyways.
283          */
284         unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
285         unsigned int slot = hash & hashinfo->ehash_mask;
286         struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
287 
288         rcu_read_lock();
289 begin:
290         sk_nulls_for_each_rcu(sk, node, &head->chain) {
291                 if (sk->sk_hash != hash)
292                         continue;
293                 if (likely(INET_MATCH(sk, net, acookie,
294                                       saddr, daddr, ports, dif))) {
295                         if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
296                                 goto out;
297                         if (unlikely(!INET_MATCH(sk, net, acookie,
298                                                  saddr, daddr, ports, dif))) {
299                                 sock_gen_put(sk);
300                                 goto begin;
301                         }
302                         goto found;
303                 }
304         }
305         /*
306          * if the nulls value we got at the end of this lookup is
307          * not the expected one, we must restart lookup.
308          * We probably met an item that was moved to another chain.
309          */
310         if (get_nulls_value(node) != slot)
311                 goto begin;
312 out:
313         sk = NULL;
314 found:
315         rcu_read_unlock();
316         return sk;
317 }
318 EXPORT_SYMBOL_GPL(__inet_lookup_established);
319 
320 /* called with local bh disabled */
321 static int __inet_check_established(struct inet_timewait_death_row *death_row,
322                                     struct sock *sk, __u16 lport,
323                                     struct inet_timewait_sock **twp)
324 {
325         struct inet_hashinfo *hinfo = death_row->hashinfo;
326         struct inet_sock *inet = inet_sk(sk);
327         __be32 daddr = inet->inet_rcv_saddr;
328         __be32 saddr = inet->inet_daddr;
329         int dif = sk->sk_bound_dev_if;
330         INET_ADDR_COOKIE(acookie, saddr, daddr);
331         const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
332         struct net *net = sock_net(sk);
333         unsigned int hash = inet_ehashfn(net, daddr, lport,
334                                          saddr, inet->inet_dport);
335         struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
336         spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
337         struct sock *sk2;
338         const struct hlist_nulls_node *node;
339         struct inet_timewait_sock *tw = NULL;
340         int twrefcnt = 0;
341 
342         spin_lock(lock);
343 
344         sk_nulls_for_each(sk2, node, &head->chain) {
345                 if (sk2->sk_hash != hash)
346                         continue;
347 
348                 if (likely(INET_MATCH(sk2, net, acookie,
349                                          saddr, daddr, ports, dif))) {
350                         if (sk2->sk_state == TCP_TIME_WAIT) {
351                                 tw = inet_twsk(sk2);
352                                 if (twsk_unique(sk, sk2, twp))
353                                         break;
354                         }
355                         goto not_unique;
356                 }
357         }
358 
359         /* Must record num and sport now. Otherwise we will see
360          * in hash table socket with a funny identity.
361          */
362         inet->inet_num = lport;
363         inet->inet_sport = htons(lport);
364         sk->sk_hash = hash;
365         WARN_ON(!sk_unhashed(sk));
366         __sk_nulls_add_node_rcu(sk, &head->chain);
367         if (tw) {
368                 twrefcnt = inet_twsk_unhash(tw);
369                 NET_INC_STATS_BH(net, LINUX_MIB_TIMEWAITRECYCLED);
370         }
371         spin_unlock(lock);
372         if (twrefcnt)
373                 inet_twsk_put(tw);
374         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
375 
376         if (twp) {
377                 *twp = tw;
378         } else if (tw) {
379                 /* Silly. Should hash-dance instead... */
380                 inet_twsk_deschedule(tw, death_row);
381 
382                 inet_twsk_put(tw);
383         }
384         return 0;
385 
386 not_unique:
387         spin_unlock(lock);
388         return -EADDRNOTAVAIL;
389 }
390 
391 static inline u32 inet_sk_port_offset(const struct sock *sk)
392 {
393         const struct inet_sock *inet = inet_sk(sk);
394         return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
395                                           inet->inet_daddr,
396                                           inet->inet_dport);
397 }
398 
399 int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw)
400 {
401         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
402         struct hlist_nulls_head *list;
403         spinlock_t *lock;
404         struct inet_ehash_bucket *head;
405         int twrefcnt = 0;
406 
407         WARN_ON(!sk_unhashed(sk));
408 
409         sk->sk_hash = inet_sk_ehashfn(sk);
410         head = inet_ehash_bucket(hashinfo, sk->sk_hash);
411         list = &head->chain;
412         lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
413 
414         spin_lock(lock);
415         __sk_nulls_add_node_rcu(sk, list);
416         if (tw) {
417                 WARN_ON(sk->sk_hash != tw->tw_hash);
418                 twrefcnt = inet_twsk_unhash(tw);
419         }
420         spin_unlock(lock);
421         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
422         return twrefcnt;
423 }
424 EXPORT_SYMBOL_GPL(__inet_hash_nolisten);
425 
426 static void __inet_hash(struct sock *sk)
427 {
428         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
429         struct inet_listen_hashbucket *ilb;
430 
431         if (sk->sk_state != TCP_LISTEN) {
432                 __inet_hash_nolisten(sk, NULL);
433                 return;
434         }
435 
436         WARN_ON(!sk_unhashed(sk));
437         ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
438 
439         spin_lock(&ilb->lock);
440         __sk_nulls_add_node_rcu(sk, &ilb->head);
441         sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
442         spin_unlock(&ilb->lock);
443 }
444 
445 void inet_hash(struct sock *sk)
446 {
447         if (sk->sk_state != TCP_CLOSE) {
448                 local_bh_disable();
449                 __inet_hash(sk);
450                 local_bh_enable();
451         }
452 }
453 EXPORT_SYMBOL_GPL(inet_hash);
454 
455 void inet_unhash(struct sock *sk)
456 {
457         struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
458         spinlock_t *lock;
459         int done;
460 
461         if (sk_unhashed(sk))
462                 return;
463 
464         if (sk->sk_state == TCP_LISTEN)
465                 lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
466         else
467                 lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
468 
469         spin_lock_bh(lock);
470         done = __sk_nulls_del_node_init_rcu(sk);
471         if (done)
472                 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
473         spin_unlock_bh(lock);
474 }
475 EXPORT_SYMBOL_GPL(inet_unhash);
476 
477 int __inet_hash_connect(struct inet_timewait_death_row *death_row,
478                 struct sock *sk, u32 port_offset,
479                 int (*check_established)(struct inet_timewait_death_row *,
480                         struct sock *, __u16, struct inet_timewait_sock **),
481                 int (*hash)(struct sock *sk, struct inet_timewait_sock *twp))
482 {
483         struct inet_hashinfo *hinfo = death_row->hashinfo;
484         const unsigned short snum = inet_sk(sk)->inet_num;
485         struct inet_bind_hashbucket *head;
486         struct inet_bind_bucket *tb;
487         int ret;
488         struct net *net = sock_net(sk);
489         int twrefcnt = 1;
490 
491         if (!snum) {
492                 int i, remaining, low, high, port;
493                 static u32 hint;
494                 u32 offset = hint + port_offset;
495                 struct inet_timewait_sock *tw = NULL;
496 
497                 inet_get_local_port_range(net, &low, &high);
498                 remaining = (high - low) + 1;
499 
500                 local_bh_disable();
501                 for (i = 1; i <= remaining; i++) {
502                         port = low + (i + offset) % remaining;
503                         if (inet_is_local_reserved_port(net, port))
504                                 continue;
505                         head = &hinfo->bhash[inet_bhashfn(net, port,
506                                         hinfo->bhash_size)];
507                         spin_lock(&head->lock);
508 
509                         /* Does not bother with rcv_saddr checks,
510                          * because the established check is already
511                          * unique enough.
512                          */
513                         inet_bind_bucket_for_each(tb, &head->chain) {
514                                 if (net_eq(ib_net(tb), net) &&
515                                     tb->port == port) {
516                                         if (tb->fastreuse >= 0 ||
517                                             tb->fastreuseport >= 0)
518                                                 goto next_port;
519                                         WARN_ON(hlist_empty(&tb->owners));
520                                         if (!check_established(death_row, sk,
521                                                                 port, &tw))
522                                                 goto ok;
523                                         goto next_port;
524                                 }
525                         }
526 
527                         tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
528                                         net, head, port);
529                         if (!tb) {
530                                 spin_unlock(&head->lock);
531                                 break;
532                         }
533                         tb->fastreuse = -1;
534                         tb->fastreuseport = -1;
535                         goto ok;
536 
537                 next_port:
538                         spin_unlock(&head->lock);
539                 }
540                 local_bh_enable();
541 
542                 return -EADDRNOTAVAIL;
543 
544 ok:
545                 hint += i;
546 
547                 /* Head lock still held and bh's disabled */
548                 inet_bind_hash(sk, tb, port);
549                 if (sk_unhashed(sk)) {
550                         inet_sk(sk)->inet_sport = htons(port);
551                         twrefcnt += hash(sk, tw);
552                 }
553                 if (tw)
554                         twrefcnt += inet_twsk_bind_unhash(tw, hinfo);
555                 spin_unlock(&head->lock);
556 
557                 if (tw) {
558                         inet_twsk_deschedule(tw, death_row);
559                         while (twrefcnt) {
560                                 twrefcnt--;
561                                 inet_twsk_put(tw);
562                         }
563                 }
564 
565                 ret = 0;
566                 goto out;
567         }
568 
569         head = &hinfo->bhash[inet_bhashfn(net, snum, hinfo->bhash_size)];
570         tb  = inet_csk(sk)->icsk_bind_hash;
571         spin_lock_bh(&head->lock);
572         if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
573                 hash(sk, NULL);
574                 spin_unlock_bh(&head->lock);
575                 return 0;
576         } else {
577                 spin_unlock(&head->lock);
578                 /* No definite answer... Walk to established hash table */
579                 ret = check_established(death_row, sk, snum, NULL);
580 out:
581                 local_bh_enable();
582                 return ret;
583         }
584 }
585 
586 /*
587  * Bind a port for a connect operation and hash it.
588  */
589 int inet_hash_connect(struct inet_timewait_death_row *death_row,
590                       struct sock *sk)
591 {
592         return __inet_hash_connect(death_row, sk, inet_sk_port_offset(sk),
593                         __inet_check_established, __inet_hash_nolisten);
594 }
595 EXPORT_SYMBOL_GPL(inet_hash_connect);
596 
597 void inet_hashinfo_init(struct inet_hashinfo *h)
598 {
599         int i;
600 
601         atomic_set(&h->bsockets, 0);
602         for (i = 0; i < INET_LHTABLE_SIZE; i++) {
603                 spin_lock_init(&h->listening_hash[i].lock);
604                 INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head,
605                                       i + LISTENING_NULLS_BASE);
606                 }
607 }
608 EXPORT_SYMBOL_GPL(inet_hashinfo_init);
609 

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