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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 * 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
17
18#include <linux/interrupt.h>
19#include <linux/ip.h>
20#include <linux/ipv6.h>
21#include <linux/list.h>
22#include <linux/slab.h>
23#include <linux/socket.h>
24#include <linux/spinlock.h>
25#include <linux/types.h>
26#include <linux/wait.h>
27#include <linux/vmalloc.h>
28
29#include <net/inet_connection_sock.h>
30#include <net/inet_sock.h>
31#include <net/sock.h>
32#include <net/route.h>
33#include <net/tcp_states.h>
34#include <net/netns/hash.h>
35
36#include <linux/atomic.h>
37#include <asm/byteorder.h>
38
39/* This is for all connections with a full identity, no wildcards.
40 * One chain is dedicated to TIME_WAIT sockets.
41 * I'll experiment with dynamic table growth later.
42 */
43struct inet_ehash_bucket {
44 struct hlist_nulls_head chain;
45 struct hlist_nulls_head twchain;
46};
47
48/* There are a few simple rules, which allow for local port reuse by
49 * an application. In essence:
50 *
51 * 1) Sockets bound to different interfaces may share a local port.
52 * Failing that, goto test 2.
53 * 2) If all sockets have sk->sk_reuse set, and none of them are in
54 * TCP_LISTEN state, the port may be shared.
55 * Failing that, goto test 3.
56 * 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local
57 * address, and none of them are the same, the port may be
58 * shared.
59 * Failing this, the port cannot be shared.
60 *
61 * The interesting point, is test #2. This is what an FTP server does
62 * all day. To optimize this case we use a specific flag bit defined
63 * below. As we add sockets to a bind bucket list, we perform a
64 * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN))
65 * As long as all sockets added to a bind bucket pass this test,
66 * the flag bit will be set.
67 * The resulting situation is that tcp_v[46]_verify_bind() can just check
68 * for this flag bit, if it is set and the socket trying to bind has
69 * sk->sk_reuse set, we don't even have to walk the owners list at all,
70 * we return that it is ok to bind this socket to the requested local port.
71 *
72 * Sounds like a lot of work, but it is worth it. In a more naive
73 * implementation (ie. current FreeBSD etc.) the entire list of ports
74 * must be walked for each data port opened by an ftp server. Needless
75 * to say, this does not scale at all. With a couple thousand FTP
76 * users logged onto your box, isn't it nice to know that new data
77 * ports are created in O(1) time? I thought so. ;-) -DaveM
78 */
79struct inet_bind_bucket {
80#ifdef CONFIG_NET_NS
81 struct net *ib_net;
82#endif
83 unsigned short port;
84 signed short fastreuse;
85 int num_owners;
86 struct hlist_node node;
87 struct hlist_head owners;
88};
89
90static inline struct net *ib_net(struct inet_bind_bucket *ib)
91{
92 return read_pnet(&ib->ib_net);
93}
94
95#define inet_bind_bucket_for_each(tb, pos, head) \
96 hlist_for_each_entry(tb, pos, head, node)
97
98struct inet_bind_hashbucket {
99 spinlock_t lock;
100 struct hlist_head chain;
101};
102
103/*
104 * Sockets can be hashed in established or listening table
105 * We must use different 'nulls' end-of-chain value for listening
106 * hash table, or we might find a socket that was closed and
107 * reallocated/inserted into established hash table
108 */
109#define LISTENING_NULLS_BASE (1U << 29)
110struct inet_listen_hashbucket {
111 spinlock_t lock;
112 struct hlist_nulls_head head;
113};
114
115/* This is for listening sockets, thus all sockets which possess wildcards. */
116#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
117
118struct inet_hashinfo {
119 /* This is for sockets with full identity only. Sockets here will
120 * always be without wildcards and will have the following invariant:
121 *
122 * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
123 *
124 * TIME_WAIT sockets use a separate chain (twchain).
125 */
126 struct inet_ehash_bucket *ehash;
127 spinlock_t *ehash_locks;
128 unsigned int ehash_mask;
129 unsigned int ehash_locks_mask;
130
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
136 unsigned int bhash_size;
137 /* 4 bytes hole on 64 bit */
138
139 struct kmem_cache *bind_bucket_cachep;
140
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
145 * might be often dirty.
146 */
147 /* 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
154 atomic_t bsockets;
155};
156
157static inline struct inet_ehash_bucket *inet_ehash_bucket(
158 struct inet_hashinfo *hashinfo,
159 unsigned int hash)
160{
161 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
162}
163
164static inline spinlock_t *inet_ehash_lockp(
165 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;
187 if (sizeof(spinlock_t) != 0) {
188#ifdef CONFIG_NUMA
189 if (size * sizeof(spinlock_t) > PAGE_SIZE)
190 hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t));
191 else
192#endif
193 hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t),
194 GFP_KERNEL);
195 if (!hashinfo->ehash_locks)
196 return ENOMEM;
197 for (i = 0; i < size; i++)
198 spin_lock_init(&hashinfo->ehash_locks[i]);
199 }
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) *
209 sizeof(spinlock_t);
210 if (size > PAGE_SIZE)
211 vfree(hashinfo->ehash_locks);
212 else
213#endif
214 kfree(hashinfo->ehash_locks);
215 hashinfo->ehash_locks = NULL;
216 }
217}
218
219extern struct inet_bind_bucket *
220 inet_bind_bucket_create(struct kmem_cache *cachep,
221 struct net *net,
222 struct inet_bind_hashbucket *head,
223 const unsigned short snum);
224extern void inet_bind_bucket_destroy(struct kmem_cache *cachep,
225 struct inet_bind_bucket *tb);
226
227static inline int inet_bhashfn(struct net *net,
228 const __u16 lport, const int bhash_size)
229{
230 return (lport + net_hash_mix(net)) & (bhash_size - 1);
231}
232
233extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
234 const unsigned short snum);
235
236/* These can have wildcards, don't try too hard. */
237static inline int inet_lhashfn(struct net *net, const unsigned short num)
238{
239 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
240}
241
242static inline int inet_sk_listen_hashfn(const struct sock *sk)
243{
244 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
245}
246
247/* Caller must disable local BH processing. */
248extern int __inet_inherit_port(struct sock *sk, struct sock *child);
249
250extern void inet_put_port(struct sock *sk);
251
252void inet_hashinfo_init(struct inet_hashinfo *h);
253
254extern int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw);
255extern void inet_hash(struct sock *sk);
256extern void inet_unhash(struct sock *sk);
257
258extern struct sock *__inet_lookup_listener(struct net *net,
259 struct inet_hashinfo *hashinfo,
260 const __be32 daddr,
261 const unsigned short hnum,
262 const int dif);
263
264static inline struct sock *inet_lookup_listener(struct net *net,
265 struct inet_hashinfo *hashinfo,
266 __be32 daddr, __be16 dport, int dif)
267{
268 return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif);
269}
270
271/* Socket demux engine toys. */
272/* What happens here is ugly; there's a pair of adjacent fields in
273 struct inet_sock; __be16 dport followed by __u16 num. We want to
274 search by pair, so we combine the keys into a single 32bit value
275 and compare with 32bit value read from &...->dport. Let's at least
276 make sure that it's not mixed with anything else...
277 On 64bit targets we combine comparisons with pair of adjacent __be32
278 fields in the same way.
279*/
280typedef __u32 __bitwise __portpair;
281#ifdef __BIG_ENDIAN
282#define INET_COMBINED_PORTS(__sport, __dport) \
283 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
284#else /* __LITTLE_ENDIAN */
285#define INET_COMBINED_PORTS(__sport, __dport) \
286 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
287#endif
288
289#if (BITS_PER_LONG == 64)
290typedef __u64 __bitwise __addrpair;
291#ifdef __BIG_ENDIAN
292#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
293 const __addrpair __name = (__force __addrpair) ( \
294 (((__force __u64)(__be32)(__saddr)) << 32) | \
295 ((__force __u64)(__be32)(__daddr)));
296#else /* __LITTLE_ENDIAN */
297#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
298 const __addrpair __name = (__force __addrpair) ( \
299 (((__force __u64)(__be32)(__daddr)) << 32) | \
300 ((__force __u64)(__be32)(__saddr)));
301#endif /* __BIG_ENDIAN */
302#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
303 (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
304 ((*((__addrpair *)&(inet_sk(__sk)->inet_daddr))) == (__cookie)) && \
305 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
306 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
307#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
308 (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
309 ((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
310 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
311 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
312#else /* 32-bit arch */
313#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
314#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
315 (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
316 (inet_sk(__sk)->inet_daddr == (__saddr)) && \
317 (inet_sk(__sk)->inet_rcv_saddr == (__daddr)) && \
318 ((*((__portpair *)&(inet_sk(__sk)->inet_dport))) == (__ports)) && \
319 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
320#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
321 (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \
322 (inet_twsk(__sk)->tw_daddr == (__saddr)) && \
323 (inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
324 ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
325 (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
326#endif /* 64-bit arch */
327
328/*
329 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
330 * not check it for lookups anymore, thanks Alexey. -DaveM
331 *
332 * Local BH must be disabled here.
333 */
334extern struct sock * __inet_lookup_established(struct net *net,
335 struct inet_hashinfo *hashinfo,
336 const __be32 saddr, const __be16 sport,
337 const __be32 daddr, const u16 hnum, const int dif);
338
339static inline struct sock *
340 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
341 const __be32 saddr, const __be16 sport,
342 const __be32 daddr, const __be16 dport,
343 const int dif)
344{
345 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
346 ntohs(dport), dif);
347}
348
349static inline struct sock *__inet_lookup(struct net *net,
350 struct inet_hashinfo *hashinfo,
351 const __be32 saddr, const __be16 sport,
352 const __be32 daddr, const __be16 dport,
353 const int dif)
354{
355 u16 hnum = ntohs(dport);
356 struct sock *sk = __inet_lookup_established(net, hashinfo,
357 saddr, sport, daddr, hnum, dif);
358
359 return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif);
360}
361
362static inline struct sock *inet_lookup(struct net *net,
363 struct inet_hashinfo *hashinfo,
364 const __be32 saddr, const __be16 sport,
365 const __be32 daddr, const __be16 dport,
366 const int dif)
367{
368 struct sock *sk;
369
370 local_bh_disable();
371 sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
372 local_bh_enable();
373
374 return sk;
375}
376
377static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
378 struct sk_buff *skb,
379 const __be16 sport,
380 const __be16 dport)
381{
382 struct sock *sk;
383 const struct iphdr *iph = ip_hdr(skb);
384
385 if (unlikely(sk = skb_steal_sock(skb)))
386 return sk;
387 else
388 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
389 iph->saddr, sport,
390 iph->daddr, dport, inet_iif(skb));
391}
392
393extern int __inet_hash_connect(struct inet_timewait_death_row *death_row,
394 struct sock *sk,
395 u32 port_offset,
396 int (*check_established)(struct inet_timewait_death_row *,
397 struct sock *, __u16, struct inet_timewait_sock **),
398 int (*hash)(struct sock *sk, struct inet_timewait_sock *twp));
399
400extern int inet_hash_connect(struct inet_timewait_death_row *death_row,
401 struct sock *sk);
402#endif /* _INET_HASHTABLES_H */
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 * 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
17
18#include <linux/interrupt.h>
19#include <linux/ip.h>
20#include <linux/ipv6.h>
21#include <linux/list.h>
22#include <linux/slab.h>
23#include <linux/socket.h>
24#include <linux/spinlock.h>
25#include <linux/types.h>
26#include <linux/wait.h>
27
28#include <net/inet_connection_sock.h>
29#include <net/inet_sock.h>
30#include <net/sock.h>
31#include <net/route.h>
32#include <net/tcp_states.h>
33#include <net/netns/hash.h>
34
35#include <linux/atomic.h>
36#include <asm/byteorder.h>
37
38/* This is for all connections with a full identity, no wildcards.
39 * The 'e' prefix stands for Establish, but we really put all sockets
40 * but LISTEN ones.
41 */
42struct inet_ehash_bucket {
43 struct hlist_nulls_head chain;
44};
45
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 {
78 possible_net_t ib_net;
79 unsigned short port;
80 signed char fastreuse;
81 signed char fastreuseport;
82 kuid_t fastuid;
83 int num_owners;
84 struct hlist_node node;
85 struct hlist_head owners;
86};
87
88static inline struct net *ib_net(struct inet_bind_bucket *ib)
89{
90 return read_pnet(&ib->ib_net);
91}
92
93#define inet_bind_bucket_for_each(tb, head) \
94 hlist_for_each_entry(tb, head, node)
95
96struct inet_bind_hashbucket {
97 spinlock_t lock;
98 struct hlist_head chain;
99};
100
101/*
102 * Sockets can be hashed in established or listening table
103 * We must use different 'nulls' end-of-chain value for listening
104 * hash table, or we might find a socket that was closed and
105 * reallocated/inserted into established hash table
106 */
107#define LISTENING_NULLS_BASE (1U << 29)
108struct inet_listen_hashbucket {
109 spinlock_t lock;
110 struct hlist_nulls_head head;
111};
112
113/* This is for listening sockets, thus all sockets which possess wildcards. */
114#define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */
115
116struct inet_hashinfo {
117 /* This is for sockets with full identity only. Sockets here will
118 * always be without wildcards and will have the following invariant:
119 *
120 * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE
121 *
122 */
123 struct inet_ehash_bucket *ehash;
124 spinlock_t *ehash_locks;
125 unsigned int ehash_mask;
126 unsigned int ehash_locks_mask;
127
128 /* Ok, let's try this, I give up, we do need a local binding
129 * TCP hash as well as the others for fast bind/connect.
130 */
131 struct inet_bind_hashbucket *bhash;
132
133 unsigned int bhash_size;
134 /* 4 bytes hole on 64 bit */
135
136 struct kmem_cache *bind_bucket_cachep;
137
138 /* All the above members are written once at bootup and
139 * never written again _or_ are predominantly read-access.
140 *
141 * Now align to a new cache line as all the following members
142 * might be often dirty.
143 */
144 /* All sockets in TCP_LISTEN state will be in here. This is the only
145 * table where wildcard'd TCP sockets can exist. Hash function here
146 * is just local port number.
147 */
148 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
149 ____cacheline_aligned_in_smp;
150};
151
152static inline struct inet_ehash_bucket *inet_ehash_bucket(
153 struct inet_hashinfo *hashinfo,
154 unsigned int hash)
155{
156 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
157}
158
159static inline spinlock_t *inet_ehash_lockp(
160 struct inet_hashinfo *hashinfo,
161 unsigned int hash)
162{
163 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
164}
165
166int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);
167
168static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
169{
170 kvfree(hashinfo->ehash_locks);
171 hashinfo->ehash_locks = NULL;
172}
173
174struct inet_bind_bucket *
175inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
176 struct inet_bind_hashbucket *head,
177 const unsigned short snum);
178void inet_bind_bucket_destroy(struct kmem_cache *cachep,
179 struct inet_bind_bucket *tb);
180
181static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
182 const u32 bhash_size)
183{
184 return (lport + net_hash_mix(net)) & (bhash_size - 1);
185}
186
187void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
188 const unsigned short snum);
189
190/* These can have wildcards, don't try too hard. */
191static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
192{
193 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
194}
195
196static inline int inet_sk_listen_hashfn(const struct sock *sk)
197{
198 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
199}
200
201/* Caller must disable local BH processing. */
202int __inet_inherit_port(const struct sock *sk, struct sock *child);
203
204void inet_put_port(struct sock *sk);
205
206void inet_hashinfo_init(struct inet_hashinfo *h);
207
208bool inet_ehash_insert(struct sock *sk, struct sock *osk);
209bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
210int __inet_hash(struct sock *sk, struct sock *osk,
211 int (*saddr_same)(const struct sock *sk1,
212 const struct sock *sk2,
213 bool match_wildcard));
214int inet_hash(struct sock *sk);
215void inet_unhash(struct sock *sk);
216
217struct sock *__inet_lookup_listener(struct net *net,
218 struct inet_hashinfo *hashinfo,
219 struct sk_buff *skb, int doff,
220 const __be32 saddr, const __be16 sport,
221 const __be32 daddr,
222 const unsigned short hnum,
223 const int dif);
224
225static inline struct sock *inet_lookup_listener(struct net *net,
226 struct inet_hashinfo *hashinfo,
227 struct sk_buff *skb, int doff,
228 __be32 saddr, __be16 sport,
229 __be32 daddr, __be16 dport, int dif)
230{
231 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
232 daddr, ntohs(dport), dif);
233}
234
235/* Socket demux engine toys. */
236/* What happens here is ugly; there's a pair of adjacent fields in
237 struct inet_sock; __be16 dport followed by __u16 num. We want to
238 search by pair, so we combine the keys into a single 32bit value
239 and compare with 32bit value read from &...->dport. Let's at least
240 make sure that it's not mixed with anything else...
241 On 64bit targets we combine comparisons with pair of adjacent __be32
242 fields in the same way.
243*/
244#ifdef __BIG_ENDIAN
245#define INET_COMBINED_PORTS(__sport, __dport) \
246 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
247#else /* __LITTLE_ENDIAN */
248#define INET_COMBINED_PORTS(__sport, __dport) \
249 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
250#endif
251
252#if (BITS_PER_LONG == 64)
253#ifdef __BIG_ENDIAN
254#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
255 const __addrpair __name = (__force __addrpair) ( \
256 (((__force __u64)(__be32)(__saddr)) << 32) | \
257 ((__force __u64)(__be32)(__daddr)))
258#else /* __LITTLE_ENDIAN */
259#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
260 const __addrpair __name = (__force __addrpair) ( \
261 (((__force __u64)(__be32)(__daddr)) << 32) | \
262 ((__force __u64)(__be32)(__saddr)))
263#endif /* __BIG_ENDIAN */
264#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
265 (((__sk)->sk_portpair == (__ports)) && \
266 ((__sk)->sk_addrpair == (__cookie)) && \
267 (!(__sk)->sk_bound_dev_if || \
268 ((__sk)->sk_bound_dev_if == (__dif))) && \
269 net_eq(sock_net(__sk), (__net)))
270#else /* 32-bit arch */
271#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
272 const int __name __deprecated __attribute__((unused))
273
274#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
275 (((__sk)->sk_portpair == (__ports)) && \
276 ((__sk)->sk_daddr == (__saddr)) && \
277 ((__sk)->sk_rcv_saddr == (__daddr)) && \
278 (!(__sk)->sk_bound_dev_if || \
279 ((__sk)->sk_bound_dev_if == (__dif))) && \
280 net_eq(sock_net(__sk), (__net)))
281#endif /* 64-bit arch */
282
283/*
284 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need
285 * not check it for lookups anymore, thanks Alexey. -DaveM
286 *
287 * Local BH must be disabled here.
288 */
289struct sock *__inet_lookup_established(struct net *net,
290 struct inet_hashinfo *hashinfo,
291 const __be32 saddr, const __be16 sport,
292 const __be32 daddr, const u16 hnum,
293 const int dif);
294
295static inline struct sock *
296 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
297 const __be32 saddr, const __be16 sport,
298 const __be32 daddr, const __be16 dport,
299 const int dif)
300{
301 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
302 ntohs(dport), dif);
303}
304
305static inline struct sock *__inet_lookup(struct net *net,
306 struct inet_hashinfo *hashinfo,
307 struct sk_buff *skb, int doff,
308 const __be32 saddr, const __be16 sport,
309 const __be32 daddr, const __be16 dport,
310 const int dif)
311{
312 u16 hnum = ntohs(dport);
313 struct sock *sk = __inet_lookup_established(net, hashinfo,
314 saddr, sport, daddr, hnum, dif);
315
316 return sk ? : __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
317 sport, daddr, hnum, dif);
318}
319
320static inline struct sock *inet_lookup(struct net *net,
321 struct inet_hashinfo *hashinfo,
322 struct sk_buff *skb, int doff,
323 const __be32 saddr, const __be16 sport,
324 const __be32 daddr, const __be16 dport,
325 const int dif)
326{
327 struct sock *sk;
328
329 local_bh_disable();
330 sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
331 dport, dif);
332 local_bh_enable();
333
334 return sk;
335}
336
337static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
338 struct sk_buff *skb,
339 int doff,
340 const __be16 sport,
341 const __be16 dport)
342{
343 struct sock *sk = skb_steal_sock(skb);
344 const struct iphdr *iph = ip_hdr(skb);
345
346 if (sk)
347 return sk;
348 else
349 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
350 doff, iph->saddr, sport,
351 iph->daddr, dport, inet_iif(skb));
352}
353
354u32 sk_ehashfn(const struct sock *sk);
355u32 inet6_ehashfn(const struct net *net,
356 const struct in6_addr *laddr, const u16 lport,
357 const struct in6_addr *faddr, const __be16 fport);
358
359static inline void sk_daddr_set(struct sock *sk, __be32 addr)
360{
361 sk->sk_daddr = addr; /* alias of inet_daddr */
362#if IS_ENABLED(CONFIG_IPV6)
363 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
364#endif
365}
366
367static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
368{
369 sk->sk_rcv_saddr = addr; /* alias of inet_rcv_saddr */
370#if IS_ENABLED(CONFIG_IPV6)
371 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
372#endif
373}
374
375int __inet_hash_connect(struct inet_timewait_death_row *death_row,
376 struct sock *sk, u32 port_offset,
377 int (*check_established)(struct inet_timewait_death_row *,
378 struct sock *, __u16,
379 struct inet_timewait_sock **));
380
381int inet_hash_connect(struct inet_timewait_death_row *death_row,
382 struct sock *sk);
383#endif /* _INET_HASHTABLES_H */