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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>
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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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109struct inet_listen_hashbucket {
110 spinlock_t lock;
111 unsigned int count;
112 struct hlist_head head;
113};
114
115
116#define INET_LHTABLE_SIZE 32
117
118struct inet_hashinfo {
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125 struct inet_ehash_bucket *ehash;
126 spinlock_t *ehash_locks;
127 unsigned int ehash_mask;
128 unsigned int ehash_locks_mask;
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132
133 struct kmem_cache *bind_bucket_cachep;
134 struct inet_bind_hashbucket *bhash;
135 unsigned int bhash_size;
136
137
138 unsigned int lhash2_mask;
139 struct inet_listen_hashbucket *lhash2;
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153 struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE]
154 ____cacheline_aligned_in_smp;
155};
156
157#define inet_lhash2_for_each_icsk_rcu(__icsk, list) \
158 hlist_for_each_entry_rcu(__icsk, list, icsk_listen_portaddr_node)
159
160static inline struct inet_listen_hashbucket *
161inet_lhash2_bucket(struct inet_hashinfo *h, u32 hash)
162{
163 return &h->lhash2[hash & h->lhash2_mask];
164}
165
166static inline struct inet_ehash_bucket *inet_ehash_bucket(
167 struct inet_hashinfo *hashinfo,
168 unsigned int hash)
169{
170 return &hashinfo->ehash[hash & hashinfo->ehash_mask];
171}
172
173static inline spinlock_t *inet_ehash_lockp(
174 struct inet_hashinfo *hashinfo,
175 unsigned int hash)
176{
177 return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask];
178}
179
180int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo);
181
182static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo)
183{
184 kvfree(hashinfo->ehash_locks);
185 hashinfo->ehash_locks = NULL;
186}
187
188static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
189 int dif, int sdif)
190{
191#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
192 return inet_bound_dev_eq(!!net->ipv4.sysctl_tcp_l3mdev_accept,
193 bound_dev_if, dif, sdif);
194#else
195 return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
196#endif
197}
198
199struct inet_bind_bucket *
200inet_bind_bucket_create(struct kmem_cache *cachep, struct net *net,
201 struct inet_bind_hashbucket *head,
202 const unsigned short snum, int l3mdev);
203void inet_bind_bucket_destroy(struct kmem_cache *cachep,
204 struct inet_bind_bucket *tb);
205
206static inline u32 inet_bhashfn(const struct net *net, const __u16 lport,
207 const u32 bhash_size)
208{
209 return (lport + net_hash_mix(net)) & (bhash_size - 1);
210}
211
212void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
213 const unsigned short snum);
214
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216static inline u32 inet_lhashfn(const struct net *net, const unsigned short num)
217{
218 return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1);
219}
220
221static inline int inet_sk_listen_hashfn(const struct sock *sk)
222{
223 return inet_lhashfn(sock_net(sk), inet_sk(sk)->inet_num);
224}
225
226
227int __inet_inherit_port(const struct sock *sk, struct sock *child);
228
229void inet_put_port(struct sock *sk);
230
231void inet_hashinfo_init(struct inet_hashinfo *h);
232void inet_hashinfo2_init(struct inet_hashinfo *h, const char *name,
233 unsigned long numentries, int scale,
234 unsigned long low_limit,
235 unsigned long high_limit);
236int inet_hashinfo2_init_mod(struct inet_hashinfo *h);
237
238bool inet_ehash_insert(struct sock *sk, struct sock *osk);
239bool inet_ehash_nolisten(struct sock *sk, struct sock *osk);
240int __inet_hash(struct sock *sk, struct sock *osk);
241int inet_hash(struct sock *sk);
242void inet_unhash(struct sock *sk);
243
244struct sock *__inet_lookup_listener(struct net *net,
245 struct inet_hashinfo *hashinfo,
246 struct sk_buff *skb, int doff,
247 const __be32 saddr, const __be16 sport,
248 const __be32 daddr,
249 const unsigned short hnum,
250 const int dif, const int sdif);
251
252static inline struct sock *inet_lookup_listener(struct net *net,
253 struct inet_hashinfo *hashinfo,
254 struct sk_buff *skb, int doff,
255 __be32 saddr, __be16 sport,
256 __be32 daddr, __be16 dport, int dif, int sdif)
257{
258 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr, sport,
259 daddr, ntohs(dport), dif, sdif);
260}
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271#ifdef __BIG_ENDIAN
272#define INET_COMBINED_PORTS(__sport, __dport) \
273 ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport)))
274#else
275#define INET_COMBINED_PORTS(__sport, __dport) \
276 ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport)))
277#endif
278
279#if (BITS_PER_LONG == 64)
280#ifdef __BIG_ENDIAN
281#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
282 const __addrpair __name = (__force __addrpair) ( \
283 (((__force __u64)(__be32)(__saddr)) << 32) | \
284 ((__force __u64)(__be32)(__daddr)))
285#else
286#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
287 const __addrpair __name = (__force __addrpair) ( \
288 (((__force __u64)(__be32)(__daddr)) << 32) | \
289 ((__force __u64)(__be32)(__saddr)))
290#endif
291#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
292 (((__sk)->sk_portpair == (__ports)) && \
293 ((__sk)->sk_addrpair == (__cookie)) && \
294 (((__sk)->sk_bound_dev_if == (__dif)) || \
295 ((__sk)->sk_bound_dev_if == (__sdif))) && \
296 net_eq(sock_net(__sk), (__net)))
297#else
298#define INET_ADDR_COOKIE(__name, __saddr, __daddr) \
299 const int __name __deprecated __attribute__((unused))
300
301#define INET_MATCH(__sk, __net, __cookie, __saddr, __daddr, __ports, __dif, __sdif) \
302 (((__sk)->sk_portpair == (__ports)) && \
303 ((__sk)->sk_daddr == (__saddr)) && \
304 ((__sk)->sk_rcv_saddr == (__daddr)) && \
305 (((__sk)->sk_bound_dev_if == (__dif)) || \
306 ((__sk)->sk_bound_dev_if == (__sdif))) && \
307 net_eq(sock_net(__sk), (__net)))
308#endif
309
310
311
312
313struct sock *__inet_lookup_established(struct net *net,
314 struct inet_hashinfo *hashinfo,
315 const __be32 saddr, const __be16 sport,
316 const __be32 daddr, const u16 hnum,
317 const int dif, const int sdif);
318
319static inline struct sock *
320 inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
321 const __be32 saddr, const __be16 sport,
322 const __be32 daddr, const __be16 dport,
323 const int dif)
324{
325 return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
326 ntohs(dport), dif, 0);
327}
328
329static inline struct sock *__inet_lookup(struct net *net,
330 struct inet_hashinfo *hashinfo,
331 struct sk_buff *skb, int doff,
332 const __be32 saddr, const __be16 sport,
333 const __be32 daddr, const __be16 dport,
334 const int dif, const int sdif,
335 bool *refcounted)
336{
337 u16 hnum = ntohs(dport);
338 struct sock *sk;
339
340 sk = __inet_lookup_established(net, hashinfo, saddr, sport,
341 daddr, hnum, dif, sdif);
342 *refcounted = true;
343 if (sk)
344 return sk;
345 *refcounted = false;
346 return __inet_lookup_listener(net, hashinfo, skb, doff, saddr,
347 sport, daddr, hnum, dif, sdif);
348}
349
350static inline struct sock *inet_lookup(struct net *net,
351 struct inet_hashinfo *hashinfo,
352 struct sk_buff *skb, int doff,
353 const __be32 saddr, const __be16 sport,
354 const __be32 daddr, const __be16 dport,
355 const int dif)
356{
357 struct sock *sk;
358 bool refcounted;
359
360 sk = __inet_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
361 dport, dif, 0, &refcounted);
362
363 if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
364 sk = NULL;
365 return sk;
366}
367
368static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo,
369 struct sk_buff *skb,
370 int doff,
371 const __be16 sport,
372 const __be16 dport,
373 const int sdif,
374 bool *refcounted)
375{
376 struct sock *sk = skb_steal_sock(skb);
377 const struct iphdr *iph = ip_hdr(skb);
378
379 *refcounted = true;
380 if (sk)
381 return sk;
382
383 return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo, skb,
384 doff, iph->saddr, sport,
385 iph->daddr, dport, inet_iif(skb), sdif,
386 refcounted);
387}
388
389u32 inet6_ehashfn(const struct net *net,
390 const struct in6_addr *laddr, const u16 lport,
391 const struct in6_addr *faddr, const __be16 fport);
392
393static inline void sk_daddr_set(struct sock *sk, __be32 addr)
394{
395 sk->sk_daddr = addr;
396#if IS_ENABLED(CONFIG_IPV6)
397 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_daddr);
398#endif
399}
400
401static inline void sk_rcv_saddr_set(struct sock *sk, __be32 addr)
402{
403 sk->sk_rcv_saddr = addr;
404#if IS_ENABLED(CONFIG_IPV6)
405 ipv6_addr_set_v4mapped(addr, &sk->sk_v6_rcv_saddr);
406#endif
407}
408
409int __inet_hash_connect(struct inet_timewait_death_row *death_row,
410 struct sock *sk, u32 port_offset,
411 int (*check_established)(struct inet_timewait_death_row *,
412 struct sock *, __u16,
413 struct inet_timewait_sock **));
414
415int inet_hash_connect(struct inet_timewait_death_row *death_row,
416 struct sock *sk);
417#endif
418