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10#ifndef _INET_HASHTABLES_H
11#define _INET_HASHTABLES_H
12
13
14#include <linux/interrupt.h>
15#include <linux/ip.h>
16#include <linux/ipv6.h>
17#include <linux/list.h>
18#include <linux/slab.h>
19#include <linux/socket.h>
20#include <linux/spinlock.h>
21#include <linux/types.h>
22#include <linux/wait.h>
23
24#include <net/inet_connection_sock.h>
25#include <net/inet_sock.h>
26#include <net/sock.h>
27#include <net/route.h>
28#include <net/tcp_states.h>
29#include <net/netns/hash.h>
30
31#include <linux/refcount.h>
32#include <asm/byteorder.h>
33
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37
38struct inet_ehash_bucket {
39 struct hlist_nulls_head chain;
40};
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73#define FASTREUSEPORT_ANY 1
74#define FASTREUSEPORT_STRICT 2
75
76struct inet_bind_bucket {
77 possible_net_t ib_net;
78 int l3mdev;
79 unsigned short port;
80 signed char fastreuse;
81 signed char fastreuseport;
82 kuid_t fastuid;
83#if IS_ENABLED(CONFIG_IPV6)
84 struct in6_addr fast_v6_rcv_saddr;
85#endif
86 __be32 fast_rcv_saddr;
87 unsigned short fast_sk_family;
88 bool fast_ipv6_only;
89 struct hlist_node node;
90 struct hlist_head owners;
91};
92
93static inline struct net *ib_net(struct inet_bind_bucket *ib)
94{
95 return read_pnet(&ib->ib_net);
96}
97
98#define inet_bind_bucket_for_each(tb, head) \
99 hlist_for_each_entry(tb, head, node)
100
101struct inet_bind_hashbucket {
102 spinlock_t lock;
103 struct hlist_head chain;
104};
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110
111#define LISTENING_NULLS_BASE (1U << 29)
112struct inet_listen_hashbucket {
113 spinlock_t lock;
114 unsigned int count;
115 union {
116 struct hlist_head head;
117 struct hlist_nulls_head nulls_head;
118 };
119};
120
121
122#define INET_LHTABLE_SIZE 32
123
124struct inet_hashinfo {
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131 struct inet_ehash_bucket *ehash;
132 spinlock_t *ehash_locks;
133 unsigned int ehash_mask;
134 unsigned int ehash_locks_mask;
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139 struct kmem_cache *bind_bucket_cachep;
140 struct inet_bind_hashbucket *bhash;
141 unsigned int bhash_size;
142
143
144 unsigned int lhash2_mask;
145 struct inet_listen_hashbucket *lhash2;
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159 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
160 ____cacheline_aligned_in_smp;
161};
162
163#define inet_lhash2_for_each_icsk_continue(__icsk) \
164 hlist_for_each_entry_continue(__icsk, icsk_listen_portaddr_node)
165
166#define inet_lhash2_for_each_icsk(__icsk, list) \
167 hlist_for_each_entry(__icsk, list, icsk_listen_portaddr_node)
168
169#define inet_lhash2_for_each_icsk_rcu(__icsk, list) \
170 hlist_for_each_entry_rcu(__icsk, list, icsk_listen_portaddr_node)
171
172static inline struct inet_listen_hashbucket *
173inet_lhash2_bucket(struct inet_hashinfo *h, u32 hash)
174{
175 return &h->lhash2[hash & h->lhash2_mask];
176}
177
178static inline struct inet_ehash_bucket *inet_ehash_bucket(
179 struct inet_hashinfo *hashinfo,
180 unsigned int hash)
181{
182 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
183}
184
185static inline spinlock_t *inet_ehash_lockp(
186 struct inet_hashinfo *hashinfo,
187 unsigned int hash)
188{
189 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
190}
191
192int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);
193
194static inline void inet_hashinfo2_free_mod(struct inet_hashinfo *h)
195{
196 kfree(h->lhash2);
197 h->lhash2 = NULL;
198}
199
200static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
201{
202 kvfree(hashinfo->ehash_locks);
203 hashinfo->ehash_locks = NULL;
204}
205
206static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
207 int dif, int sdif)
208{
209#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
210 return inet_bound_dev_eq(!!net->ipv4.sysctl_tcp_l3mdev_accept,
211 bound_dev_if, dif, sdif);
212#else
213 return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
214#endif
215}
216
217struct inet_bind_bucket *
218inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
219 struct inet_bind_hashbucket *head,
220 const unsigned short snum, int l3mdev);
221void inet_bind_bucket_destroy(struct kmem_cache *cachep,
222 struct inet_bind_bucket *tb);
223
224static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
225 const u32 bhash_size)
226{
227 return (lport + net_hash_mix(net)) & (bhash_size - 1);
228}
229
230void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
231 const unsigned short snum);
232
233
234static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
235{
236 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
237}
238
239static inline int inet_sk_listen_hashfn(const struct sock *sk)
240{
241 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
242}
243
244
245int __inet_inherit_port(const struct sock *sk, struct sock *child);
246
247void inet_put_port(struct sock *sk);
248
249void inet_hashinfo_init(struct inet_hashinfo *h);
250void inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
251 unsigned long numentries, int scale,
252 unsigned long low_limit,
253 unsigned long high_limit);
254int inet_hashinfo2_init_mod(struct inet_hashinfo *h);
255
256bool inet_ehash_insert(struct sock *sk, struct sock *osk, bool *found_dup_sk);
257bool inet_ehash_nolisten(struct sock *sk, struct sock *osk,
258 bool *found_dup_sk);
259int __inet_hash(struct sock *sk, struct sock *osk);
260int inet_hash(struct sock *sk);
261void inet_unhash(struct sock *sk);
262
263struct sock *__inet_lookup_listener(struct net *net,
264 struct inet_hashinfo *hashinfo,
265 struct sk_buff *skb, int doff,
266 const __be32 saddr, const __be16 sport,
267 const __be32 daddr,
268 const unsigned short hnum,
269 const int dif, const int sdif);
270
271static inline struct sock *inet_lookup_listener(struct net *net,
272 struct inet_hashinfo *hashinfo,
273 struct sk_buff *skb, int doff,
274 __be32 saddr, __be16 sport,
275 __be32 daddr, __be16 dport, int dif, int sdif)
276{
277 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
278 daddr, ntohs(dport), dif, sdif);
279}
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290#ifdef __BIG_ENDIAN
291#define INET_COMBINED_PORTS(__sport, __dport) \
292 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
293#else
294#define INET_COMBINED_PORTS(__sport, __dport) \
295 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
296#endif
297
298#if (BITS_PER_LONG == 64)
299#ifdef __BIG_ENDIAN
300#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
301 const __addrpair __name = (__force __addrpair) ( \
302 (((__force __u64)(__be32)(__saddr)) << 32) | \
303 ((__force __u64)(__be32)(__daddr)))
304#else
305#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
306 const __addrpair __name = (__force __addrpair) ( \
307 (((__force __u64)(__be32)(__daddr)) << 32) | \
308 ((__force __u64)(__be32)(__saddr)))
309#endif
310#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
311 (((__sk)->sk_portpair == (__ports)) && \
312 ((__sk)->sk_addrpair == (__cookie)) && \
313 (((__sk)->sk_bound_dev_if == (__dif)) || \
314 ((__sk)->sk_bound_dev_if == (__sdif))) && \
315 net_eq(sock_net(__sk), (__net)))
316#else
317#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
318 const int __name __deprecated __attribute__((unused))
319
320#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
321 (((__sk)->sk_portpair == (__ports)) && \
322 ((__sk)->sk_daddr == (__saddr)) && \
323 ((__sk)->sk_rcv_saddr == (__daddr)) && \
324 (((__sk)->sk_bound_dev_if == (__dif)) || \
325 ((__sk)->sk_bound_dev_if == (__sdif))) && \
326 net_eq(sock_net(__sk), (__net)))
327#endif
328
329
330
331
332struct sock *__inet_lookup_established(struct net *net,
333 struct inet_hashinfo *hashinfo,
334 const __be32 saddr, const __be16 sport,
335 const __be32 daddr, const u16 hnum,
336 const int dif, const int sdif);
337
338static inline struct sock *
339 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
340 const __be32 saddr, const __be16 sport,
341 const __be32 daddr, const __be16 dport,
342 const int dif)
343{
344 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
345 ntohs(dport), dif, 0);
346}
347
348static inline struct sock *__inet_lookup(struct net *net,
349 struct inet_hashinfo *hashinfo,
350 struct sk_buff *skb, int doff,
351 const __be32 saddr, const __be16 sport,
352 const __be32 daddr, const __be16 dport,
353 const int dif, const int sdif,
354 bool *refcounted)
355{
356 u16 hnum = ntohs(dport);
357 struct sock *sk;
358
359 sk = __inet_lookup_established(net, hashinfo, saddr, sport,
360 daddr, hnum, dif, sdif);
361 *refcounted = true;
362 if (sk)
363 return sk;
364 *refcounted = false;
365 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
366 sport, daddr, hnum, dif, sdif);
367}
368
369static inline struct sock *inet_lookup(struct net *net,
370 struct inet_hashinfo *hashinfo,
371 struct sk_buff *skb, int doff,
372 const __be32 saddr, const __be16 sport,
373 const __be32 daddr, const __be16 dport,
374 const int dif)
375{
376 struct sock *sk;
377 bool refcounted;
378
379 sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
380 dport, dif, 0, &refcounted);
381
382 if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
383 sk = NULL;
384 return sk;
385}
386
387static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
388 struct sk_buff *skb,
389 int doff,
390 const __be16 sport,
391 const __be16 dport,
392 const int sdif,
393 bool *refcounted)
394{
395 struct sock *sk = skb_steal_sock(skb, refcounted);
396 const struct iphdr *iph = ip_hdr(skb);
397
398 if (sk)
399 return sk;
400
401 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
402 doff, iph->saddr, sport,
403 iph->daddr, dport, inet_iif(skb), sdif,
404 refcounted);
405}
406
407u32 inet6_ehashfn(const struct net *net,
408 const struct in6_addr *laddr, const u16 lport,
409 const struct in6_addr *faddr, const __be16 fport);
410
411static inline void sk_daddr_set(struct sock *sk, __be32 addr)
412{
413 sk->sk_daddr = addr;
414#if IS_ENABLED(CONFIG_IPV6)
415 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
416#endif
417}
418
419static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
420{
421 sk->sk_rcv_saddr = addr;
422#if IS_ENABLED(CONFIG_IPV6)
423 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
424#endif
425}
426
427int __inet_hash_connect(struct inet_timewait_death_row *death_row,
428 struct sock *sk, u32 port_offset,
429 int (*check_established)(struct inet_timewait_death_row *,
430 struct sock *, __u16,
431 struct inet_timewait_sock **));
432
433int inet_hash_connect(struct inet_timewait_death_row *death_row,
434 struct sock *sk);
435#endif
436