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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 */
Josef Bacik637bc8b2017-01-17 07:51:06 -080077#define FASTREUSEPORT_ANY 1
78#define FASTREUSEPORT_STRICT 2
79
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070080struct inet_bind_bucket {
Eric W. Biederman0c5c9fb2015-03-11 23:06:44 -050081 possible_net_t ib_net;
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;
Josef Bacik637bc8b2017-01-17 07:51:06 -080086#if IS_ENABLED(CONFIG_IPV6)
87 struct in6_addr fast_v6_rcv_saddr;
88#endif
89 __be32 fast_rcv_saddr;
90 unsigned short fast_sk_family;
91 bool fast_ipv6_only;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -070092 struct hlist_node node;
93 struct hlist_head owners;
94};
95
Eric Dumazet7a9546e2008-11-12 00:54:20 -080096static inline struct net *ib_net(struct inet_bind_bucket *ib)
97{
98 return read_pnet(&ib->ib_net);
99}
100
Sasha Levinb67bfe02013-02-27 17:06:00 -0800101#define inet_bind_bucket_for_each(tb, head) \
102 hlist_for_each_entry(tb, head, node)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700103
104struct inet_bind_hashbucket {
105 spinlock_t lock;
106 struct hlist_head chain;
107};
108
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800109/*
110 * Sockets can be hashed in established or listening table
Eric Dumazetc25eb3b2008-11-23 17:22:55 -0800111 */
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800112struct inet_listen_hashbucket {
113 spinlock_t lock;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700114 struct hlist_head head;
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800115};
116
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700117/* This is for listening sockets, thus all sockets which possess wildcards. */
118#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
119
120struct inet_hashinfo {
121 /* This is for sockets with full identity only. Sockets here will
122 * always be without wildcards and will have the following invariant:
123 *
124 * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
125 *
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700126 */
127 struct inet_ehash_bucket *ehash;
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800128 spinlock_t *ehash_locks;
Eric Dumazetf373b532009-10-09 00:16:19 +0000129 unsigned int ehash_mask;
Eric Dumazet230140c2007-11-07 02:40:20 -0800130 unsigned int ehash_locks_mask;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700131
132 /* Ok, let's try this, I give up, we do need a local binding
133 * TCP hash as well as the others for fast bind/connect.
134 */
135 struct inet_bind_hashbucket *bhash;
136
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -0700137 unsigned int bhash_size;
Eric Dumazet24dd1fa2009-02-01 12:31:33 -0800138 /* 4 bytes hole on 64 bit */
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700139
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800140 struct kmem_cache *bind_bucket_cachep;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700141
142 /* All the above members are written once at bootup and
143 * never written again _or_ are predominantly read-access.
144 *
145 * Now align to a new cache line as all the following members
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800146 * might be often dirty.
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700147 */
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800148 /* All sockets in TCP_LISTEN state will be in here. This is the only
149 * table where wildcard'd TCP sockets can exist. Hash function here
150 * is just local port number.
151 */
152 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
153 ____cacheline_aligned_in_smp;
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700154};
155
Eric Dumazet81c3d542005-10-03 14:13:38 -0700156static inline struct inet_ehash_bucket *inet_ehash_bucket(
157 struct inet_hashinfo *hashinfo,
158 unsigned int hash)
159{
Eric Dumazetf373b532009-10-09 00:16:19 +0000160 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700161}
162
Eric Dumazet9db66bd2008-11-20 20:39:09 -0800163static inline spinlock_t *inet_ehash_lockp(
Eric Dumazet230140c2007-11-07 02:40:20 -0800164 struct inet_hashinfo *hashinfo,
165 unsigned int hash)
166{
167 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
168}
169
Eric Dumazet095dc8e2015-05-26 07:55:34 -0700170int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);
Eric Dumazet230140c2007-11-07 02:40:20 -0800171
172static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
173{
Eric Dumazet095dc8e2015-05-26 07:55:34 -0700174 kvfree(hashinfo->ehash_locks);
175 hashinfo->ehash_locks = NULL;
Eric Dumazet230140c2007-11-07 02:40:20 -0800176}
177
Joe Perches1fd51152013-09-21 10:22:41 -0700178struct inet_bind_bucket *
179inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
180 struct inet_bind_hashbucket *head,
181 const unsigned short snum);
182void inet_bind_bucket_destroy(struct kmem_cache *cachep,
183 struct inet_bind_bucket *tb);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700184
Eric Dumazet6eada012015-03-18 14:05:33 -0700185static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
186 const u32 bhash_size)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700187{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700188 return (lport + net_hash_mix(net)) & (bhash_size - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700189}
190
Joe Perches1fd51152013-09-21 10:22:41 -0700191void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
192 const unsigned short snum);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700193
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700194/* These can have wildcards, don't try too hard. */
Eric Dumazet6eada012015-03-18 14:05:33 -0700195static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700196{
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700197 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700198}
199
200static inline int inet_sk_listen_hashfn(const struct sock *sk)
201{
Eric Dumazetc720c7e82009-10-15 06:30:45 +0000202 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
Arnaldo Carvalho de Melo77d8bf92005-08-09 20:00:51 -0700203}
204
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700205/* Caller must disable local BH processing. */
Eric Dumazet1ce31c92015-09-29 07:42:44 -0700206int __inet_inherit_port(const struct sock *sk, struct sock *child);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700207
Joe Perches1fd51152013-09-21 10:22:41 -0700208void inet_put_port(struct sock *sk);
Arnaldo Carvalho de Melo2d8c4ce2005-08-09 20:07:13 -0700209
Eric Dumazet5caea4e2008-11-20 00:40:07 -0800210void inet_hashinfo_init(struct inet_hashinfo *h);
Arnaldo Carvalho de Melof3f05f72005-08-09 20:08:09 -0700211
Eric Dumazet5e0724d2015-10-22 08:20:46 -0700212bool inet_ehash_insert(struct sock *sk, struct sock *osk);
213bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
Josef Bacikfe38d2a2017-01-17 07:51:01 -0800214int __inet_hash(struct sock *sk, struct sock *osk);
Craig Gallek086c6532016-02-10 11:50:35 -0500215int inet_hash(struct sock *sk);
Joe Perches1fd51152013-09-21 10:22:41 -0700216void inet_unhash(struct sock *sk);
Arnaldo Carvalho de Melo33b62232005-08-09 20:09:06 -0700217
Joe Perches1fd51152013-09-21 10:22:41 -0700218struct sock *__inet_lookup_listener(struct net *net,
219 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500220 struct sk_buff *skb, int doff,
Joe Perches1fd51152013-09-21 10:22:41 -0700221 const __be32 saddr, const __be16 sport,
222 const __be32 daddr,
223 const unsigned short hnum,
224 const int dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700225
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800226static inline struct sock *inet_lookup_listener(struct net *net,
227 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500228 struct sk_buff *skb, int doff,
Tom Herbertda5e3632013-01-22 09:50:24 +0000229 __be32 saddr, __be16 sport,
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800230 __be32 daddr, __be16 dport, int dif)
Herbert Xu8f4910692006-08-09 15:47:12 -0700231{
Craig Galleka5836362016-02-10 11:50:38 -0500232 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
Tom Herbertda5e3632013-01-22 09:50:24 +0000233 daddr, ntohs(dport), dif);
Herbert Xu8f4910692006-08-09 15:47:12 -0700234}
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700235
236/* Socket demux engine toys. */
Al Viro4f765d82006-09-27 18:43:07 -0700237/* What happens here is ugly; there's a pair of adjacent fields in
238 struct inet_sock; __be16 dport followed by __u16 num. We want to
239 search by pair, so we combine the keys into a single 32bit value
240 and compare with 32bit value read from &...->dport. Let's at least
241 make sure that it's not mixed with anything else...
242 On 64bit targets we combine comparisons with pair of adjacent __be32
243 fields in the same way.
244*/
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700245#ifdef __BIG_ENDIAN
246#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700247 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700248#else /* __LITTLE_ENDIAN */
249#define INET_COMBINED_PORTS(__sport, __dport) \
Al Viro4f765d82006-09-27 18:43:07 -0700250 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700251#endif
252
253#if (BITS_PER_LONG == 64)
254#ifdef __BIG_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)(__saddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700258 ((__force __u64)(__be32)(__daddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700259#else /* __LITTLE_ENDIAN */
260#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
Al Viro4f765d82006-09-27 18:43:07 -0700261 const __addrpair __name = (__force __addrpair) ( \
262 (((__force __u64)(__be32)(__daddr)) << 32) | \
Joe Perchesc7228312014-05-13 20:30:07 -0700263 ((__force __u64)(__be32)(__saddr)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700264#endif /* __BIG_ENDIAN */
Eric Dumazetce43b032012-11-30 09:49:27 +0000265#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700266 (((__sk)->sk_portpair == (__ports)) && \
267 ((__sk)->sk_addrpair == (__cookie)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000268 (!(__sk)->sk_bound_dev_if || \
269 ((__sk)->sk_bound_dev_if == (__dif))) && \
270 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700271#else /* 32-bit arch */
Joe Perchesc7228312014-05-13 20:30:07 -0700272#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
273 const int __name __deprecated __attribute__((unused))
274
Eric Dumazetce43b032012-11-30 09:49:27 +0000275#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
Eric Dumazet50805462013-10-02 04:29:50 -0700276 (((__sk)->sk_portpair == (__ports)) && \
277 ((__sk)->sk_daddr == (__saddr)) && \
278 ((__sk)->sk_rcv_saddr == (__daddr)) && \
Eric Dumazetce43b032012-11-30 09:49:27 +0000279 (!(__sk)->sk_bound_dev_if || \
280 ((__sk)->sk_bound_dev_if == (__dif))) && \
281 net_eq(sock_net(__sk), (__net)))
Arnaldo Carvalho de Melo8feaf0c02005-08-09 20:09:30 -0700282#endif /* 64-bit arch */
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700283
Eric Dumazetee3cf322016-04-01 08:52:14 -0700284/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700285 * not check it for lookups anymore, thanks Alexey. -DaveM
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700286 */
Joe Perches1fd51152013-09-21 10:22:41 -0700287struct sock *__inet_lookup_established(struct net *net,
288 struct inet_hashinfo *hashinfo,
289 const __be32 saddr, const __be16 sport,
290 const __be32 daddr, const u16 hnum,
291 const int dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700292
Herbert Xu8f4910692006-08-09 15:47:12 -0700293static inline struct sock *
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800294 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
Al Virofb99c842006-09-27 18:43:33 -0700295 const __be32 saddr, const __be16 sport,
296 const __be32 daddr, const __be16 dport,
Herbert Xu8f4910692006-08-09 15:47:12 -0700297 const int dif)
298{
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800299 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
Herbert Xu8f4910692006-08-09 15:47:12 -0700300 ntohs(dport), dif);
301}
302
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800303static inline struct sock *__inet_lookup(struct net *net,
304 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500305 struct sk_buff *skb, int doff,
Al Virofb99c842006-09-27 18:43:33 -0700306 const __be32 saddr, const __be16 sport,
307 const __be32 daddr, const __be16 dport,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700308 const int dif,
309 bool *refcounted)
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700310{
Herbert Xu8f4910692006-08-09 15:47:12 -0700311 u16 hnum = ntohs(dport);
Eric Dumazet3b24d852016-04-01 08:52:17 -0700312 struct sock *sk;
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800313
Eric Dumazet3b24d852016-04-01 08:52:17 -0700314 sk = __inet_lookup_established(net, hashinfo, saddr, sport,
315 daddr, hnum, dif);
316 *refcounted = true;
317 if (sk)
318 return sk;
319 *refcounted = false;
320 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
321 sport, daddr, hnum, dif);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700322}
323
Pavel Emelyanovc67499c2008-01-31 05:06:40 -0800324static inline struct sock *inet_lookup(struct net *net,
325 struct inet_hashinfo *hashinfo,
Craig Galleka5836362016-02-10 11:50:38 -0500326 struct sk_buff *skb, int doff,
Al Virofb99c842006-09-27 18:43:33 -0700327 const __be32 saddr, const __be16 sport,
328 const __be32 daddr, const __be16 dport,
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700329 const int dif)
330{
331 struct sock *sk;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700332 bool refcounted;
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700333
Craig Galleka5836362016-02-10 11:50:38 -0500334 sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700335 dport, dif, &refcounted);
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700336
Eric Dumazet3b24d852016-04-01 08:52:17 -0700337 if (sk && !refcounted && !atomic_inc_not_zero(&sk->sk_refcnt))
338 sk = NULL;
Arnaldo Carvalho de Meloe48c4142005-08-09 20:09:46 -0700339 return sk;
340}
Arnaldo Carvalho de Meloa7f5e7f2005-12-13 23:25:31 -0800341
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700342static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
343 struct sk_buff *skb,
Craig Galleka5836362016-02-10 11:50:38 -0500344 int doff,
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700345 const __be16 sport,
Eric Dumazet3b24d852016-04-01 08:52:17 -0700346 const __be16 dport,
347 bool *refcounted)
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700348{
David S. Miller41063e92012-06-19 21:22:05 -0700349 struct sock *sk = skb_steal_sock(skb);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700350 const struct iphdr *iph = ip_hdr(skb);
351
Eric Dumazet3b24d852016-04-01 08:52:17 -0700352 *refcounted = true;
David S. Miller41063e92012-06-19 21:22:05 -0700353 if (sk)
KOVACS Krisztian23542612008-10-07 12:41:01 -0700354 return sk;
Eric Dumazet3b24d852016-04-01 08:52:17 -0700355
356 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
357 doff, iph->saddr, sport,
358 iph->daddr, dport, inet_iif(skb),
359 refcounted);
Arnaldo Carvalho de Melo9a1f27c2008-10-07 11:41:57 -0700360}
361
Eric Dumazet5b441f72015-03-18 14:05:34 -0700362u32 sk_ehashfn(const struct sock *sk);
Eric Dumazetd1e559d2015-03-18 14:05:35 -0700363u32 inet6_ehashfn(const struct net *net,
364 const struct in6_addr *laddr, const u16 lport,
365 const struct in6_addr *faddr, const __be16 fport);
366
367static inline void sk_daddr_set(struct sock *sk, __be32 addr)
368{
369 sk->sk_daddr = addr; /* alias of inet_daddr */
370#if IS_ENABLED(CONFIG_IPV6)
371 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
372#endif
373}
374
375static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
376{
377 sk->sk_rcv_saddr = addr; /* alias of inet_rcv_saddr */
378#if IS_ENABLED(CONFIG_IPV6)
379 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
380#endif
381}
Eric Dumazet5b441f72015-03-18 14:05:34 -0700382
Joe Perches1fd51152013-09-21 10:22:41 -0700383int __inet_hash_connect(struct inet_timewait_death_row *death_row,
384 struct sock *sk, u32 port_offset,
385 int (*check_established)(struct inet_timewait_death_row *,
386 struct sock *, __u16,
Eric Dumazetb4d64442015-03-18 14:05:37 -0700387 struct inet_timewait_sock **));
Eric Dumazet9327f702009-12-04 03:46:54 +0000388
Joe Perches1fd51152013-09-21 10:22:41 -0700389int inet_hash_connect(struct inet_timewait_death_row *death_row,
390 struct sock *sk);
Arnaldo Carvalho de Melo304a1612005-08-09 19:59:20 -0700391#endif /* _INET_HASHTABLES_H */