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.
6 * Generic INET6 transport hashtables
8 * Authors: Lotsa people, from code originally in tcp, generalised here
9 * by Arnaldo Carvalho de Melo <acme@mandriva.com>
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
17 #include <linux/config.h>
18 #include <linux/module.h>
19 #include <linux/random.h>
21 #include <net/inet_connection_sock.h>
22 #include <net/inet_hashtables.h>
23 #include <net/inet6_hashtables.h>
26 struct sock
*inet6_lookup_listener(struct inet_hashinfo
*hashinfo
,
27 const struct in6_addr
*daddr
,
28 const unsigned short hnum
, const int dif
)
31 const struct hlist_node
*node
;
32 struct sock
*result
= NULL
;
33 int score
, hiscore
= 0;
35 read_lock(&hashinfo
->lhash_lock
);
36 sk_for_each(sk
, node
, &hashinfo
->listening_hash
[inet_lhashfn(hnum
)]) {
37 if (inet_sk(sk
)->num
== hnum
&& sk
->sk_family
== PF_INET6
) {
38 const struct ipv6_pinfo
*np
= inet6_sk(sk
);
41 if (!ipv6_addr_any(&np
->rcv_saddr
)) {
42 if (!ipv6_addr_equal(&np
->rcv_saddr
, daddr
))
46 if (sk
->sk_bound_dev_if
) {
47 if (sk
->sk_bound_dev_if
!= dif
)
55 if (score
> hiscore
) {
63 read_unlock(&hashinfo
->lhash_lock
);
67 EXPORT_SYMBOL_GPL(inet6_lookup_listener
);
69 struct sock
*inet6_lookup(struct inet_hashinfo
*hashinfo
,
70 const struct in6_addr
*saddr
, const u16 sport
,
71 const struct in6_addr
*daddr
, const u16 dport
,
77 sk
= __inet6_lookup(hashinfo
, saddr
, sport
, daddr
, ntohs(dport
), dif
);
83 EXPORT_SYMBOL_GPL(inet6_lookup
);
85 static int __inet6_check_established(struct inet_timewait_death_row
*death_row
,
86 struct sock
*sk
, const __u16 lport
,
87 struct inet_timewait_sock
**twp
)
89 struct inet_hashinfo
*hinfo
= death_row
->hashinfo
;
90 const struct inet_sock
*inet
= inet_sk(sk
);
91 const struct ipv6_pinfo
*np
= inet6_sk(sk
);
92 const struct in6_addr
*daddr
= &np
->rcv_saddr
;
93 const struct in6_addr
*saddr
= &np
->daddr
;
94 const int dif
= sk
->sk_bound_dev_if
;
95 const u32 ports
= INET_COMBINED_PORTS(inet
->dport
, lport
);
96 const unsigned int hash
= inet6_ehashfn(daddr
, inet
->num
, saddr
,
98 struct inet_ehash_bucket
*head
= inet_ehash_bucket(hinfo
, hash
);
100 const struct hlist_node
*node
;
101 struct inet_timewait_sock
*tw
;
103 prefetch(head
->chain
.first
);
104 write_lock(&head
->lock
);
106 /* Check TIME-WAIT sockets first. */
107 sk_for_each(sk2
, node
, &(head
+ hinfo
->ehash_size
)->chain
) {
108 const struct inet6_timewait_sock
*tw6
= inet6_twsk(sk2
);
112 if(*((__u32
*)&(tw
->tw_dport
)) == ports
&&
113 sk2
->sk_family
== PF_INET6
&&
114 ipv6_addr_equal(&tw6
->tw_v6_daddr
, saddr
) &&
115 ipv6_addr_equal(&tw6
->tw_v6_rcv_saddr
, daddr
) &&
116 sk2
->sk_bound_dev_if
== sk
->sk_bound_dev_if
) {
117 if (twsk_unique(sk
, sk2
, twp
))
125 /* And established part... */
126 sk_for_each(sk2
, node
, &head
->chain
) {
127 if (INET6_MATCH(sk2
, hash
, saddr
, daddr
, ports
, dif
))
132 BUG_TRAP(sk_unhashed(sk
));
133 __sk_add_node(sk
, &head
->chain
);
135 sock_prot_inc_use(sk
->sk_prot
);
136 write_unlock(&head
->lock
);
140 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED
);
141 } else if (tw
!= NULL
) {
142 /* Silly. Should hash-dance instead... */
143 inet_twsk_deschedule(tw
, death_row
);
144 NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED
);
151 write_unlock(&head
->lock
);
152 return -EADDRNOTAVAIL
;
155 static inline u32
inet6_sk_port_offset(const struct sock
*sk
)
157 const struct inet_sock
*inet
= inet_sk(sk
);
158 const struct ipv6_pinfo
*np
= inet6_sk(sk
);
159 return secure_ipv6_port_ephemeral(np
->rcv_saddr
.s6_addr32
,
164 int inet6_hash_connect(struct inet_timewait_death_row
*death_row
,
167 struct inet_hashinfo
*hinfo
= death_row
->hashinfo
;
168 const unsigned short snum
= inet_sk(sk
)->num
;
169 struct inet_bind_hashbucket
*head
;
170 struct inet_bind_bucket
*tb
;
174 const int low
= sysctl_local_port_range
[0];
175 const int high
= sysctl_local_port_range
[1];
176 const int range
= high
- low
;
179 const u32 offset
= hint
+ inet6_sk_port_offset(sk
);
180 struct hlist_node
*node
;
181 struct inet_timewait_sock
*tw
= NULL
;
184 for (i
= 1; i
<= range
; i
++) {
185 port
= low
+ (i
+ offset
) % range
;
186 head
= &hinfo
->bhash
[inet_bhashfn(port
, hinfo
->bhash_size
)];
187 spin_lock(&head
->lock
);
189 /* Does not bother with rcv_saddr checks,
190 * because the established check is already
193 inet_bind_bucket_for_each(tb
, node
, &head
->chain
) {
194 if (tb
->port
== port
) {
195 BUG_TRAP(!hlist_empty(&tb
->owners
));
196 if (tb
->fastreuse
>= 0)
198 if (!__inet6_check_established(death_row
,
206 tb
= inet_bind_bucket_create(hinfo
->bind_bucket_cachep
,
209 spin_unlock(&head
->lock
);
216 spin_unlock(&head
->lock
);
220 return -EADDRNOTAVAIL
;
225 /* Head lock still held and bh's disabled */
226 inet_bind_hash(sk
, tb
, port
);
227 if (sk_unhashed(sk
)) {
228 inet_sk(sk
)->sport
= htons(port
);
229 __inet6_hash(hinfo
, sk
);
231 spin_unlock(&head
->lock
);
234 inet_twsk_deschedule(tw
, death_row
);
242 head
= &hinfo
->bhash
[inet_bhashfn(snum
, hinfo
->bhash_size
)];
243 tb
= inet_csk(sk
)->icsk_bind_hash
;
244 spin_lock_bh(&head
->lock
);
246 if (sk_head(&tb
->owners
) == sk
&& sk
->sk_bind_node
.next
== NULL
) {
247 __inet6_hash(hinfo
, sk
);
248 spin_unlock_bh(&head
->lock
);
251 spin_unlock(&head
->lock
);
252 /* No definite answer... Walk to established hash table */
253 ret
= __inet6_check_established(death_row
, sk
, snum
, NULL
);
260 EXPORT_SYMBOL_GPL(inet6_hash_connect
);