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Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -07001/*
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 * Authors: Lotsa people, from code originally in tcp
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14#ifndef _INET_HASHTABLES_H
15#define _INET_HASHTABLES_H
16
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -070017
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -070018#include <linux/interrupt.h>
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070019#include <linux/ip.h>
Arnaldo Carvalho de Melo33b62232005-08-09 20:09:06 -070020#include <linux/ipv6.h>
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070021#include <linux/list.h>
22#include <linux/slab.h>
Arnaldo Carvalho de Melo33b62232005-08-09 20:09:06 -070023#include <linux/socket.h>
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070024#include <linux/spinlock.h>
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -070025#include <linux/types.h>
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -070026#include <linux/wait.h>
Eric Dumazet9e4505c2007-11-10 21:18:39 -080027#include <linux/vmalloc.h>
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -070028
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070029#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020030#include <net/inet_sock.h>
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -070031#include <net/sock.h>
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070032#include <net/route.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070033#include <net/tcp_states.h>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070034#include <net/netns/hash.h>
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -070035
Arun Sharma600634972011-07-26 16:09:06 -070036#include <linux/atomic.h>
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -070037#include <asm/byteorder.h>
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -070038
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070039/* This is for all connections with a full identity, no wildcards.
Eric Dumazet05dbc7b2013-10-03 00:22:02 -070040 * The 'e' prefix stands for Establish, but we really put all sockets
41 * but LISTEN ones.
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070042 */
43struct inet_ehash_bucket {
Eric Dumazet3ab5aee2008-11-16 19:40:17 -080044 struct hlist_nulls_head chain;
Eric Dumazet6d255362005-10-04 15:55:51 -070045};
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070046
47/* There are a few simple rules, which allow for local port reuse by
48 * an application. In essence:
49 *
50 * 1) Sockets bound to different interfaces may share a local port.
51 * Failing that, goto test 2.
52 * 2) If all sockets have sk->sk_reuse set, and none of them are in
53 * TCP_LISTEN state, the port may be shared.
54 * Failing that, goto test 3.
55 * 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
56 * address, and none of them are the same, the port may be
57 * shared.
58 * Failing this, the port cannot be shared.
59 *
60 * The interesting point, is test #2. This is what an FTP server does
61 * all day. To optimize this case we use a specific flag bit defined
62 * below. As we add sockets to a bind bucket list, we perform a
63 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
64 * As long as all sockets added to a bind bucket pass this test,
65 * the flag bit will be set.
66 * The resulting situation is that tcp_v[46]_verify_bind() can just check
67 * for this flag bit, if it is set and the socket trying to bind has
68 * sk->sk_reuse set, we don't even have to walk the owners list at all,
69 * we return that it is ok to bind this socket to the requested local port.
70 *
71 * Sounds like a lot of work, but it is worth it. In a more naive
72 * implementation (ie. current FreeBSD etc.) the entire list of ports
73 * must be walked for each data port opened by an ftp server. Needless
74 * to say, this does not scale at all. With a couple thousand FTP
75 * users logged onto your box, isn't it nice to know that new data
76 * ports are created in O(1) time? I thought so. ;-) -DaveM
77 */
78struct inet_bind_bucket {
Eric Dumazet7a9546e2008-11-12 00:54:20 -080079#ifdef CONFIG_NET_NS
Pavel Emelyanov941b1d22008-01-31 05:05:50 -080080 struct net *ib_net;
Eric Dumazet7a9546e2008-11-12 00:54:20 -080081#endif
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070082 unsigned short port;
Tom Herbertda5e3632013-01-22 09:50:24 +000083 signed char fastreuse;
84 signed char fastreuseport;
85 kuid_t fastuid;
Evgeniy Polyakova9d8f912009-01-19 16:46:02 -080086 int num_owners;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070087 struct hlist_node node;
88 struct hlist_head owners;
89};
90
Eric Dumazet7a9546e2008-11-12 00:54:20 -080091static inline struct net *ib_net(struct inet_bind_bucket *ib)
92{
93 return read_pnet(&ib->ib_net);
94}
95
Sasha Levinb67bfe02013-02-27 17:06:00 -080096#define inet_bind_bucket_for_each(tb, head) \
97 hlist_for_each_entry(tb, head, node)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070098
99struct inet_bind_hashbucket {
100 spinlock_t lock;
101 struct hlist_head chain;
102};
103
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800104/*
105 * Sockets can be hashed in established or listening table
106 * We must use different 'nulls' end-of-chain value for listening
107 * hash table, or we might find a socket that was closed and
108 * reallocated/inserted into established hash table
109 */
110#define LISTENING_NULLS_BASE (1U << 29)
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800111struct inet_listen_hashbucket {
112 spinlock_t lock;
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800113 struct hlist_nulls_head head;
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800114};
115
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700116/* This is for listening sockets, thus all sockets which possess wildcards. */
117#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
118
119struct inet_hashinfo {
120 /* This is for sockets with full identity only. Sockets here will
121 * always be without wildcards and will have the following invariant:
122 *
123 * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
124 *
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700125 */
126 struct inet_ehash_bucket *ehash;
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800127 spinlock_t *ehash_locks;
Eric Dumazetf373b532009-10-09 00:16:19 +0000128 unsigned int ehash_mask;
Eric Dumazet230140c2007-11-07 02:40:20 -0800129 unsigned int ehash_locks_mask;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700130
131 /* Ok, let's try this, I give up, we do need a local binding
132 * TCP hash as well as the others for fast bind/connect.
133 */
134 struct inet_bind_hashbucket *bhash;
135
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700136 unsigned int bhash_size;
Eric Dumazet24dd1fa2009-02-01 12:31:33 -0800137 /* 4 bytes hole on 64 bit */
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700138
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800139 struct kmem_cache *bind_bucket_cachep;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700140
141 /* All the above members are written once at bootup and
142 * never written again _or_ are predominantly read-access.
143 *
144 * Now align to a new cache line as all the following members
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800145 * might be often dirty.
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700146 */
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800147 /* All sockets in TCP_LISTEN state will be in here. This is the only
148 * table where wildcard'd TCP sockets can exist. Hash function here
149 * is just local port number.
150 */
151 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
152 ____cacheline_aligned_in_smp;
153
Eric Dumazet24dd1fa2009-02-01 12:31:33 -0800154 atomic_t bsockets;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700155};
156
Eric Dumazet81c3d542005-10-03 14:13:38 -0700157static inline struct inet_ehash_bucket *inet_ehash_bucket(
158 struct inet_hashinfo *hashinfo,
159 unsigned int hash)
160{
Eric Dumazetf373b532009-10-09 00:16:19 +0000161 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700162}
163
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800164static inline spinlock_t *inet_ehash_lockp(
Eric Dumazet230140c2007-11-07 02:40:20 -0800165 struct inet_hashinfo *hashinfo,
166 unsigned int hash)
167{
168 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
169}
170
171static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
172{
173 unsigned int i, size = 256;
174#if defined(CONFIG_PROVE_LOCKING)
175 unsigned int nr_pcpus = 2;
176#else
177 unsigned int nr_pcpus = num_possible_cpus();
178#endif
179 if (nr_pcpus >= 4)
180 size = 512;
181 if (nr_pcpus >= 8)
182 size = 1024;
183 if (nr_pcpus >= 16)
184 size = 2048;
185 if (nr_pcpus >= 32)
186 size = 4096;
Eric Dumazet94cd3e62009-01-27 17:45:10 -0800187 if (sizeof(spinlock_t) != 0) {
Eric Dumazet230140c2007-11-07 02:40:20 -0800188#ifdef CONFIG_NUMA
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800189 if (size * sizeof(spinlock_t) > PAGE_SIZE)
190 hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
Eric Dumazet230140c2007-11-07 02:40:20 -0800191 else
192#endif
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800193 hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
Eric Dumazet230140c2007-11-07 02:40:20 -0800194 GFP_KERNEL);
195 if (!hashinfo->ehash_locks)
196 return ENOMEM;
197 for (i = 0; i < size; i++)
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800198 spin_lock_init(&hashinfo->ehash_locks[i]);
Eric Dumazet230140c2007-11-07 02:40:20 -0800199 }
200 hashinfo->ehash_locks_mask = size - 1;
201 return 0;
202}
203
204static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
205{
206 if (hashinfo->ehash_locks) {
207#ifdef CONFIG_NUMA
208 unsigned int size = (hashinfo->ehash_locks_mask + 1) *
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800209 sizeof(spinlock_t);
Eric Dumazet230140c2007-11-07 02:40:20 -0800210 if (size > PAGE_SIZE)
211 vfree(hashinfo->ehash_locks);
212 else
Eric Dumazet230140c2007-11-07 02:40:20 -0800213#endif
Pavel Emelyanov218ad122007-11-26 20:23:31 +0800214 kfree(hashinfo->ehash_locks);
Eric Dumazet230140c2007-11-07 02:40:20 -0800215 hashinfo->ehash_locks = NULL;
216 }
217}
218
Joe Perches1fd51152013-09-21 10:22:41 -0700219struct inet_bind_bucket *
220inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
221 struct inet_bind_hashbucket *head,
222 const unsigned short snum);
223void inet_bind_bucket_destroy(struct kmem_cache *cachep,
224 struct inet_bind_bucket *tb);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700225
Joe Perches1fd51152013-09-21 10:22:41 -0700226static inline int inet_bhashfn(struct net *net, const __u16 lport,
227 const int bhash_size)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700228{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700229 return (lport + net_hash_mix(net)) & (bhash_size - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700230}
231
Joe Perches1fd51152013-09-21 10:22:41 -0700232void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
233 const unsigned short snum);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700234
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700235/* These can have wildcards, don't try too hard. */
Pavel Emelyanov2086a652008-06-16 17:13:08 -0700236static inline int inet_lhashfn(struct net *net, const unsigned short num)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700237{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700238 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700239}
240
241static inline int inet_sk_listen_hashfn(const struct sock *sk)
242{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000243 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700244}
245
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700246/* Caller must disable local BH processing. */
Joe Perches1fd51152013-09-21 10:22:41 -0700247int __inet_inherit_port(struct sock *sk, struct sock *child);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700248
Joe Perches1fd51152013-09-21 10:22:41 -0700249void inet_put_port(struct sock *sk);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700250
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800251void inet_hashinfo_init(struct inet_hashinfo *h);
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -0700252
Joe Perches1fd51152013-09-21 10:22:41 -0700253int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw);
254void inet_hash(struct sock *sk);
255void inet_unhash(struct sock *sk);
Arnaldo Carvalho de Melo33b62232005-08-09 20:09:06 -0700256
Joe Perches1fd51152013-09-21 10:22:41 -0700257struct sock *__inet_lookup_listener(struct net *net,
258 struct inet_hashinfo *hashinfo,
259 const __be32 saddr, const __be16 sport,
260 const __be32 daddr,
261 const unsigned short hnum,
262 const int dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700263
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800264static inline struct sock *inet_lookup_listener(struct net *net,
265 struct inet_hashinfo *hashinfo,
Tom Herbertda5e3632013-01-22 09:50:24 +0000266 __be32 saddr, __be16 sport,
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800267 __be32 daddr, __be16 dport, int dif)
Herbert Xu8f4910692006-08-09 15:47:12 -0700268{
Tom Herbertda5e3632013-01-22 09:50:24 +0000269 return __inet_lookup_listener(net, hashinfo, saddr, sport,
270 daddr, ntohs(dport), dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700271}
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700272
273/* Socket demux engine toys. */
Al Viro4f765d82006-09-27 18:43:07 -0700274/* What happens here is ugly; there's a pair of adjacent fields in
275 struct inet_sock; __be16 dport followed by __u16 num. We want to
276 search by pair, so we combine the keys into a single 32bit value
277 and compare with 32bit value read from &...->dport. Let's at least
278 make sure that it's not mixed with anything else...
279 On 64bit targets we combine comparisons with pair of adjacent __be32
280 fields in the same way.
281*/
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700282#ifdef __BIG_ENDIAN
283#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700284 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700285#else /* __LITTLE_ENDIAN */
286#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700287 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700288#endif
289
290#if (BITS_PER_LONG == 64)
291#ifdef __BIG_ENDIAN
292#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
Al Viro4f765d82006-09-27 18:43:07 -0700293 const __addrpair __name = (__force __addrpair) ( \
294 (((__force __u64)(__be32)(__saddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700295 ((__force __u64)(__be32)(__daddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700296#else /* __LITTLE_ENDIAN */
297#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
Al Viro4f765d82006-09-27 18:43:07 -0700298 const __addrpair __name = (__force __addrpair) ( \
299 (((__force __u64)(__be32)(__daddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700300 ((__force __u64)(__be32)(__saddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700301#endif /* __BIG_ENDIAN */
Eric Dumazetce43b032012-11-30 09:49:27 +0000302#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700303 (((__sk)->sk_portpair == (__ports)) && \
304 ((__sk)->sk_addrpair == (__cookie)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000305 (!(__sk)->sk_bound_dev_if || \
306 ((__sk)->sk_bound_dev_if == (__dif))) && \
307 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700308#else /* 32-bit arch */
Joe Perchesc7228312014-05-13 20:30:07 -0700309#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
310 const int __name __deprecated __attribute__((unused))
311
Eric Dumazetce43b032012-11-30 09:49:27 +0000312#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700313 (((__sk)->sk_portpair == (__ports)) && \
314 ((__sk)->sk_daddr == (__saddr)) && \
315 ((__sk)->sk_rcv_saddr == (__daddr)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000316 (!(__sk)->sk_bound_dev_if || \
317 ((__sk)->sk_bound_dev_if == (__dif))) && \
318 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700319#endif /* 64-bit arch */
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700320
321/*
322 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
323 * not check it for lookups anymore, thanks Alexey. -DaveM
324 *
325 * Local BH must be disabled here.
326 */
Joe Perches1fd51152013-09-21 10:22:41 -0700327struct sock *__inet_lookup_established(struct net *net,
328 struct inet_hashinfo *hashinfo,
329 const __be32 saddr, const __be16 sport,
330 const __be32 daddr, const u16 hnum,
331 const int dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700332
Herbert Xu8f4910692006-08-09 15:47:12 -0700333static inline struct sock *
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800334 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
Al Virofb99c842006-09-27 18:43:33 -0700335 const __be32 saddr, const __be16 sport,
336 const __be32 daddr, const __be16 dport,
Herbert Xu8f4910692006-08-09 15:47:12 -0700337 const int dif)
338{
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800339 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
Herbert Xu8f4910692006-08-09 15:47:12 -0700340 ntohs(dport), dif);
341}
342
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800343static inline struct sock *__inet_lookup(struct net *net,
344 struct inet_hashinfo *hashinfo,
Al Virofb99c842006-09-27 18:43:33 -0700345 const __be32 saddr, const __be16 sport,
346 const __be32 daddr, const __be16 dport,
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700347 const int dif)
348{
Herbert Xu8f4910692006-08-09 15:47:12 -0700349 u16 hnum = ntohs(dport);
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800350 struct sock *sk = __inet_lookup_established(net, hashinfo,
351 saddr, sport, daddr, hnum, dif);
352
Tom Herbertda5e3632013-01-22 09:50:24 +0000353 return sk ? : __inet_lookup_listener(net, hashinfo, saddr, sport,
354 daddr, hnum, dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700355}
356
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800357static inline struct sock *inet_lookup(struct net *net,
358 struct inet_hashinfo *hashinfo,
Al Virofb99c842006-09-27 18:43:33 -0700359 const __be32 saddr, const __be16 sport,
360 const __be32 daddr, const __be16 dport,
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700361 const int dif)
362{
363 struct sock *sk;
364
365 local_bh_disable();
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800366 sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700367 local_bh_enable();
368
369 return sk;
370}
Arnaldo Carvalho de Meloa7f5e7f2005-12-13 23:25:31 -0800371
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700372static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
373 struct sk_buff *skb,
374 const __be16 sport,
375 const __be16 dport)
376{
David S. Miller41063e92012-06-19 21:22:05 -0700377 struct sock *sk = skb_steal_sock(skb);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700378 const struct iphdr *iph = ip_hdr(skb);
379
David S. Miller41063e92012-06-19 21:22:05 -0700380 if (sk)
KOVACS Krisztian23542612008-10-07 12:41:01 -0700381 return sk;
382 else
Eric Dumazetadf30902009-06-02 05:19:30 +0000383 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
KOVACS Krisztian23542612008-10-07 12:41:01 -0700384 iph->saddr, sport,
385 iph->daddr, dport, inet_iif(skb));
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700386}
387
Joe Perches1fd51152013-09-21 10:22:41 -0700388int __inet_hash_connect(struct inet_timewait_death_row *death_row,
389 struct sock *sk, u32 port_offset,
390 int (*check_established)(struct inet_timewait_death_row *,
391 struct sock *, __u16,
392 struct inet_timewait_sock **),
393 int (*hash)(struct sock *sk,
394 struct inet_timewait_sock *twp));
Eric Dumazet9327f702009-12-04 03:46:54 +0000395
Joe Perches1fd51152013-09-21 10:22:41 -0700396int inet_hash_connect(struct inet_timewait_death_row *death_row,
397 struct sock *sk);
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700398#endif /* _INET_HASHTABLES_H */