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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
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42
43struct inet_ehash_bucket {
44 struct hlist_nulls_head chain;
45};
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78struct inet_bind_bucket {
79#ifdef CONFIG_NET_NS
80 struct net *ib_net;
81#endif
82 unsigned short port;
83 signed char fastreuse;
84 signed char fastreuseport;
85 kuid_t fastuid;
86 int num_owners;
87 struct hlist_node node;
88 struct hlist_head owners;
89};
90
91static inline struct net *ib_net(struct inet_bind_bucket *ib)
92{
93 return read_pnet(&ib->ib_net);
94}
95
96#define inet_bind_bucket_for_each(tb, head) \
97 hlist_for_each_entry(tb, head, node)
98
99struct inet_bind_hashbucket {
100 spinlock_t lock;
101 struct hlist_head chain;
102};
103
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109
110#define LISTENING_NULLS_BASE (1U << 29)
111struct inet_listen_hashbucket {
112 spinlock_t lock;
113 struct hlist_nulls_head head;
114};
115
116
117#define INET_LHTABLE_SIZE 32
118
119struct inet_hashinfo {
120
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125
126 struct inet_ehash_bucket *ehash;
127 spinlock_t *ehash_locks;
128 unsigned int ehash_mask;
129 unsigned int ehash_locks_mask;
130
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133
134 struct inet_bind_hashbucket *bhash;
135
136 unsigned int bhash_size;
137
138
139 struct kmem_cache *bind_bucket_cachep;
140
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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
219struct 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);
225
226static inline int inet_bhashfn(struct net *net, const __u16 lport,
227 const int bhash_size)
228{
229 return (lport + net_hash_mix(net)) & (bhash_size - 1);
230}
231
232void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
233 const unsigned short snum);
234
235
236static inline int inet_lhashfn(struct net *net, const unsigned short num)
237{
238 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
239}
240
241static inline int inet_sk_listen_hashfn(const struct sock *sk)
242{
243 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
244}
245
246
247int __inet_inherit_port(struct sock *sk, struct sock *child);
248
249void inet_put_port(struct sock *sk);
250
251void inet_hashinfo_init(struct inet_hashinfo *h);
252
253int __inet_hash_nolisten(struct sock *sk, struct inet_timewait_sock *tw);
254void inet_hash(struct sock *sk);
255void inet_unhash(struct sock *sk);
256
257struct 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);
263
264static inline struct sock *inet_lookup_listener(struct net *net,
265 struct inet_hashinfo *hashinfo,
266 __be32 saddr, __be16 sport,
267 __be32 daddr, __be16 dport, int dif)
268{
269 return __inet_lookup_listener(net, hashinfo, saddr, sport,
270 daddr, ntohs(dport), dif);
271}
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282#ifdef __BIG_ENDIAN
283#define INET_COMBINED_PORTS(__sport, __dport) \
284 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
285#else
286#define INET_COMBINED_PORTS(__sport, __dport) \
287 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
288#endif
289
290#if (BITS_PER_LONG == 64)
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
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
302#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
303 (((__sk)->sk_portpair == (__ports)) && \
304 ((__sk)->sk_addrpair == (__cookie)) && \
305 (!(__sk)->sk_bound_dev_if || \
306 ((__sk)->sk_bound_dev_if == (__dif))) && \
307 net_eq(sock_net(__sk), (__net)))
308#else
309#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
310 const int __name __deprecated __attribute__((unused))
311
312#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif) \
313 (((__sk)->sk_portpair == (__ports)) && \
314 ((__sk)->sk_daddr == (__saddr)) && \
315 ((__sk)->sk_rcv_saddr == (__daddr)) && \
316 (!(__sk)->sk_bound_dev_if || \
317 ((__sk)->sk_bound_dev_if == (__dif))) && \
318 net_eq(sock_net(__sk), (__net)))
319#endif
320
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326
327struct 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);
332
333static inline struct sock *
334 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
335 const __be32 saddr, const __be16 sport,
336 const __be32 daddr, const __be16 dport,
337 const int dif)
338{
339 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
340 ntohs(dport), dif);
341}
342
343static inline struct sock *__inet_lookup(struct net *net,
344 struct inet_hashinfo *hashinfo,
345 const __be32 saddr, const __be16 sport,
346 const __be32 daddr, const __be16 dport,
347 const int dif)
348{
349 u16 hnum = ntohs(dport);
350 struct sock *sk = __inet_lookup_established(net, hashinfo,
351 saddr, sport, daddr, hnum, dif);
352
353 return sk ? : __inet_lookup_listener(net, hashinfo, saddr, sport,
354 daddr, hnum, dif);
355}
356
357static inline struct sock *inet_lookup(struct net *net,
358 struct inet_hashinfo *hashinfo,
359 const __be32 saddr, const __be16 sport,
360 const __be32 daddr, const __be16 dport,
361 const int dif)
362{
363 struct sock *sk;
364
365 local_bh_disable();
366 sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
367 local_bh_enable();
368
369 return sk;
370}
371
372static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
373 struct sk_buff *skb,
374 const __be16 sport,
375 const __be16 dport)
376{
377 struct sock *sk = skb_steal_sock(skb);
378 const struct iphdr *iph = ip_hdr(skb);
379
380 if (sk)
381 return sk;
382 else
383 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
384 iph->saddr, sport,
385 iph->daddr, dport, inet_iif(skb));
386}
387
388int __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));
395
396int inet_hash_connect(struct inet_timewait_death_row *death_row,
397 struct sock *sk);
398#endif
399