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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>
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -070027
Arnaldo Carvalho de Melo463c84b2005-08-09 20:10:42 -070028#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020029#include <net/inet_sock.h>
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -070030#include <net/sock.h>
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -070031#include <net/route.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070032#include <net/tcp_states.h>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070033#include <net/netns/hash.h>
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -070034
Arun Sharma600634972011-07-26 16:09:06 -070035#include <linux/atomic.h>
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -070036#include <asm/byteorder.h>
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -070037
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070038/* This is for all connections with a full identity, no wildcards.
Eric Dumazet05dbc7b2013-10-03 00:22:02 -070039 * The 'e' prefix stands for Establish, but we really put all sockets
40 * but LISTEN ones.
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070041 */
42struct inet_ehash_bucket {
Eric Dumazet3ab5aee2008-11-16 19:40:17 -080043 struct hlist_nulls_head chain;
Eric Dumazet6d255362005-10-04 15:55:51 -070044};
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070045
46/* There are a few simple rules, which allow for local port reuse by
47 * an application. In essence:
48 *
49 * 1) Sockets bound to different interfaces may share a local port.
50 * Failing that, goto test 2.
51 * 2) If all sockets have sk->sk_reuse set, and none of them are in
52 * TCP_LISTEN state, the port may be shared.
53 * Failing that, goto test 3.
54 * 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
55 * address, and none of them are the same, the port may be
56 * shared.
57 * Failing this, the port cannot be shared.
58 *
59 * The interesting point, is test #2. This is what an FTP server does
60 * all day. To optimize this case we use a specific flag bit defined
61 * below. As we add sockets to a bind bucket list, we perform a
62 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
63 * As long as all sockets added to a bind bucket pass this test,
64 * the flag bit will be set.
65 * The resulting situation is that tcp_v[46]_verify_bind() can just check
66 * for this flag bit, if it is set and the socket trying to bind has
67 * sk->sk_reuse set, we don't even have to walk the owners list at all,
68 * we return that it is ok to bind this socket to the requested local port.
69 *
70 * Sounds like a lot of work, but it is worth it. In a more naive
71 * implementation (ie. current FreeBSD etc.) the entire list of ports
72 * must be walked for each data port opened by an ftp server. Needless
73 * to say, this does not scale at all. With a couple thousand FTP
74 * users logged onto your box, isn't it nice to know that new data
75 * ports are created in O(1) time? I thought so. ;-) -DaveM
76 */
77struct inet_bind_bucket {
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -050078 possible_net_t ib_net;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070079 unsigned short port;
Tom Herbertda5e3632013-01-22 09:50:24 +000080 signed char fastreuse;
81 signed char fastreuseport;
82 kuid_t fastuid;
Evgeniy Polyakova9d8f912009-01-19 16:46:02 -080083 int num_owners;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070084 struct hlist_node node;
85 struct hlist_head owners;
86};
87
Eric Dumazet7a9546e2008-11-12 00:54:20 -080088static inline struct net *ib_net(struct inet_bind_bucket *ib)
89{
90 return read_pnet(&ib->ib_net);
91}
92
Sasha Levinb67bfe02013-02-27 17:06:00 -080093#define inet_bind_bucket_for_each(tb, head) \
94 hlist_for_each_entry(tb, head, node)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070095
96struct inet_bind_hashbucket {
97 spinlock_t lock;
98 struct hlist_head chain;
99};
100
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800101/*
102 * Sockets can be hashed in established or listening table
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800103 */
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800104struct inet_listen_hashbucket {
105 spinlock_t lock;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700106 struct hlist_head head;
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800107};
108
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700109/* This is for listening sockets, thus all sockets which possess wildcards. */
110#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
111
112struct inet_hashinfo {
113 /* This is for sockets with full identity only. Sockets here will
114 * always be without wildcards and will have the following invariant:
115 *
116 * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
117 *
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700118 */
119 struct inet_ehash_bucket *ehash;
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800120 spinlock_t *ehash_locks;
Eric Dumazetf373b532009-10-09 00:16:19 +0000121 unsigned int ehash_mask;
Eric Dumazet230140c2007-11-07 02:40:20 -0800122 unsigned int ehash_locks_mask;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700123
124 /* Ok, let's try this, I give up, we do need a local binding
125 * TCP hash as well as the others for fast bind/connect.
126 */
127 struct inet_bind_hashbucket *bhash;
128
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700129 unsigned int bhash_size;
Eric Dumazet24dd1fa2009-02-01 12:31:33 -0800130 /* 4 bytes hole on 64 bit */
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700131
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800132 struct kmem_cache *bind_bucket_cachep;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700133
134 /* All the above members are written once at bootup and
135 * never written again _or_ are predominantly read-access.
136 *
137 * Now align to a new cache line as all the following members
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800138 * might be often dirty.
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700139 */
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800140 /* All sockets in TCP_LISTEN state will be in here. This is the only
141 * table where wildcard'd TCP sockets can exist. Hash function here
142 * is just local port number.
143 */
144 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
145 ____cacheline_aligned_in_smp;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700146};
147
Eric Dumazet81c3d542005-10-03 14:13:38 -0700148static inline struct inet_ehash_bucket *inet_ehash_bucket(
149 struct inet_hashinfo *hashinfo,
150 unsigned int hash)
151{
Eric Dumazetf373b532009-10-09 00:16:19 +0000152 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700153}
154
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800155static inline spinlock_t *inet_ehash_lockp(
Eric Dumazet230140c2007-11-07 02:40:20 -0800156 struct inet_hashinfo *hashinfo,
157 unsigned int hash)
158{
159 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
160}
161
Eric Dumazet095dc8e2015-05-26 07:55:34 -0700162int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);
Eric Dumazet230140c2007-11-07 02:40:20 -0800163
164static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
165{
Eric Dumazet095dc8e2015-05-26 07:55:34 -0700166 kvfree(hashinfo->ehash_locks);
167 hashinfo->ehash_locks = NULL;
Eric Dumazet230140c2007-11-07 02:40:20 -0800168}
169
Joe Perches1fd51152013-09-21 10:22:41 -0700170struct inet_bind_bucket *
171inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
172 struct inet_bind_hashbucket *head,
173 const unsigned short snum);
174void inet_bind_bucket_destroy(struct kmem_cache *cachep,
175 struct inet_bind_bucket *tb);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700176
Eric Dumazet6eada012015-03-18 14:05:33 -0700177static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
178 const u32 bhash_size)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700179{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700180 return (lport + net_hash_mix(net)) & (bhash_size - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700181}
182
Joe Perches1fd51152013-09-21 10:22:41 -0700183void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
184 const unsigned short snum);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700185
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700186/* These can have wildcards, don't try too hard. */
Eric Dumazet6eada012015-03-18 14:05:33 -0700187static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700188{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700189 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700190}
191
192static inline int inet_sk_listen_hashfn(const struct sock *sk)
193{
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000194 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700195}
196
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700197/* Caller must disable local BH processing. */
Eric Dumazet1ce31c92015-09-29 07:42:44 -0700198int __inet_inherit_port(const struct sock *sk, struct sock *child);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700199
Joe Perches1fd51152013-09-21 10:22:41 -0700200void inet_put_port(struct sock *sk);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700201
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800202void inet_hashinfo_init(struct inet_hashinfo *h);
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -0700203
Eric Dumazet5e0724d2015-10-22 08:20:46 -0700204bool inet_ehash_insert(struct sock *sk, struct sock *osk);
205bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
Craig Gallekc125e802016-02-10 11:50:40 -0500206int __inet_hash(struct sock *sk, struct sock *osk,
207 int (*saddr_same)(const struct sock *sk1,
208 const struct sock *sk2,
209 bool match_wildcard));
Craig Gallek086c6532016-02-10 11:50:35 -0500210int inet_hash(struct sock *sk);
Joe Perches1fd51152013-09-21 10:22:41 -0700211void inet_unhash(struct sock *sk);
Arnaldo Carvalho de Melo33b62232005-08-09 20:09:06 -0700212
Joe Perches1fd51152013-09-21 10:22:41 -0700213struct sock *__inet_lookup_listener(struct net *net,
214 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500215 struct sk_buff *skb, int doff,
Joe Perches1fd51152013-09-21 10:22:41 -0700216 const __be32 saddr, const __be16 sport,
217 const __be32 daddr,
218 const unsigned short hnum,
219 const int dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700220
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800221static inline struct sock *inet_lookup_listener(struct net *net,
222 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500223 struct sk_buff *skb, int doff,
Tom Herbertda5e3632013-01-22 09:50:24 +0000224 __be32 saddr, __be16 sport,
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800225 __be32 daddr, __be16 dport, int dif)
Herbert Xu8f4910692006-08-09 15:47:12 -0700226{
Craig Galleka5836362016-02-10 11:50:38 -0500227 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
Tom Herbertda5e3632013-01-22 09:50:24 +0000228 daddr, ntohs(dport), dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700229}
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700230
231/* Socket demux engine toys. */
Al Viro4f765d82006-09-27 18:43:07 -0700232/* What happens here is ugly; there's a pair of adjacent fields in
233 struct inet_sock; __be16 dport followed by __u16 num. We want to
234 search by pair, so we combine the keys into a single 32bit value
235 and compare with 32bit value read from &...->dport. Let's at least
236 make sure that it's not mixed with anything else...
237 On 64bit targets we combine comparisons with pair of adjacent __be32
238 fields in the same way.
239*/
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700240#ifdef __BIG_ENDIAN
241#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700242 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700243#else /* __LITTLE_ENDIAN */
244#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700245 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700246#endif
247
248#if (BITS_PER_LONG == 64)
249#ifdef __BIG_ENDIAN
250#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
Al Viro4f765d82006-09-27 18:43:07 -0700251 const __addrpair __name = (__force __addrpair) ( \
252 (((__force __u64)(__be32)(__saddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700253 ((__force __u64)(__be32)(__daddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700254#else /* __LITTLE_ENDIAN */
255#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
Al Viro4f765d82006-09-27 18:43:07 -0700256 const __addrpair __name = (__force __addrpair) ( \
257 (((__force __u64)(__be32)(__daddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700258 ((__force __u64)(__be32)(__saddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700259#endif /* __BIG_ENDIAN */
Eric Dumazetce43b032012-11-30 09:49:27 +0000260#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700261 (((__sk)->sk_portpair == (__ports)) && \
262 ((__sk)->sk_addrpair == (__cookie)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000263 (!(__sk)->sk_bound_dev_if || \
264 ((__sk)->sk_bound_dev_if == (__dif))) && \
265 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700266#else /* 32-bit arch */
Joe Perchesc7228312014-05-13 20:30:07 -0700267#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
268 const int __name __deprecated __attribute__((unused))
269
Eric Dumazetce43b032012-11-30 09:49:27 +0000270#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700271 (((__sk)->sk_portpair == (__ports)) && \
272 ((__sk)->sk_daddr == (__saddr)) && \
273 ((__sk)->sk_rcv_saddr == (__daddr)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000274 (!(__sk)->sk_bound_dev_if || \
275 ((__sk)->sk_bound_dev_if == (__dif))) && \
276 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700277#endif /* 64-bit arch */
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700278
Eric Dumazetee3cf322016-04-01 08:52:14 -0700279/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700280 * not check it for lookups anymore, thanks Alexey. -DaveM
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700281 */
Joe Perches1fd51152013-09-21 10:22:41 -0700282struct sock *__inet_lookup_established(struct net *net,
283 struct inet_hashinfo *hashinfo,
284 const __be32 saddr, const __be16 sport,
285 const __be32 daddr, const u16 hnum,
286 const int dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700287
Herbert Xu8f4910692006-08-09 15:47:12 -0700288static inline struct sock *
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800289 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
Al Virofb99c842006-09-27 18:43:33 -0700290 const __be32 saddr, const __be16 sport,
291 const __be32 daddr, const __be16 dport,
Herbert Xu8f4910692006-08-09 15:47:12 -0700292 const int dif)
293{
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800294 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
Herbert Xu8f4910692006-08-09 15:47:12 -0700295 ntohs(dport), dif);
296}
297
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800298static inline struct sock *__inet_lookup(struct net *net,
299 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500300 struct sk_buff *skb, int doff,
Al Virofb99c842006-09-27 18:43:33 -0700301 const __be32 saddr, const __be16 sport,
302 const __be32 daddr, const __be16 dport,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700303 const int dif,
304 bool *refcounted)
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700305{
Herbert Xu8f4910692006-08-09 15:47:12 -0700306 u16 hnum = ntohs(dport);
Eric Dumazet3b24d852016-04-01 08:52:17 -0700307 struct sock *sk;
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800308
Eric Dumazet3b24d852016-04-01 08:52:17 -0700309 sk = __inet_lookup_established(net, hashinfo, saddr, sport,
310 daddr, hnum, dif);
311 *refcounted = true;
312 if (sk)
313 return sk;
314 *refcounted = false;
315 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
316 sport, daddr, hnum, dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700317}
318
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800319static inline struct sock *inet_lookup(struct net *net,
320 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500321 struct sk_buff *skb, int doff,
Al Virofb99c842006-09-27 18:43:33 -0700322 const __be32 saddr, const __be16 sport,
323 const __be32 daddr, const __be16 dport,
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700324 const int dif)
325{
326 struct sock *sk;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700327 bool refcounted;
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700328
Craig Galleka5836362016-02-10 11:50:38 -0500329 sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700330 dport, dif, &refcounted);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700331
Eric Dumazet3b24d852016-04-01 08:52:17 -0700332 if (sk && !refcounted && !atomic_inc_not_zero(&sk->sk_refcnt))
333 sk = NULL;
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700334 return sk;
335}
Arnaldo Carvalho de Meloa7f5e7f2005-12-13 23:25:31 -0800336
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700337static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
338 struct sk_buff *skb,
Craig Galleka5836362016-02-10 11:50:38 -0500339 int doff,
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700340 const __be16 sport,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700341 const __be16 dport,
342 bool *refcounted)
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700343{
David S. Miller41063e92012-06-19 21:22:05 -0700344 struct sock *sk = skb_steal_sock(skb);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700345 const struct iphdr *iph = ip_hdr(skb);
346
Eric Dumazet3b24d852016-04-01 08:52:17 -0700347 *refcounted = true;
David S. Miller41063e92012-06-19 21:22:05 -0700348 if (sk)
KOVACS Krisztian23542612008-10-07 12:41:01 -0700349 return sk;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700350
351 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
352 doff, iph->saddr, sport,
353 iph->daddr, dport, inet_iif(skb),
354 refcounted);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700355}
356
Eric Dumazet5b441f72015-03-18 14:05:34 -0700357u32 sk_ehashfn(const struct sock *sk);
Eric Dumazetd1e559d2015-03-18 14:05:35 -0700358u32 inet6_ehashfn(const struct net *net,
359 const struct in6_addr *laddr, const u16 lport,
360 const struct in6_addr *faddr, const __be16 fport);
361
362static inline void sk_daddr_set(struct sock *sk, __be32 addr)
363{
364 sk->sk_daddr = addr; /* alias of inet_daddr */
365#if IS_ENABLED(CONFIG_IPV6)
366 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
367#endif
368}
369
370static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
371{
372 sk->sk_rcv_saddr = addr; /* alias of inet_rcv_saddr */
373#if IS_ENABLED(CONFIG_IPV6)
374 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
375#endif
376}
Eric Dumazet5b441f72015-03-18 14:05:34 -0700377
Joe Perches1fd51152013-09-21 10:22:41 -0700378int __inet_hash_connect(struct inet_timewait_death_row *death_row,
379 struct sock *sk, u32 port_offset,
380 int (*check_established)(struct inet_timewait_death_row *,
381 struct sock *, __u16,
Eric Dumazetb4d64442015-03-18 14:05:37 -0700382 struct inet_timewait_sock **));
Eric Dumazet9327f702009-12-04 03:46:54 +0000383
Joe Perches1fd51152013-09-21 10:22:41 -0700384int inet_hash_connect(struct inet_timewait_death_row *death_row,
385 struct sock *sk);
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700386#endif /* _INET_HASHTABLES_H */