2005-08-12 06:26:18 -06:00
|
|
|
/*
|
|
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
|
|
* operating system. INET is implemented using the BSD Socket
|
|
|
|
* interface as the means of communication with the user level.
|
|
|
|
*
|
|
|
|
* Generic INET6 transport hashtables
|
|
|
|
*
|
2005-12-14 00:25:44 -07:00
|
|
|
* Authors: Lotsa people, from code originally in tcp, generalised here
|
|
|
|
* by Arnaldo Carvalho de Melo <acme@mandriva.com>
|
2005-08-12 06:26:18 -06:00
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License
|
|
|
|
* as published by the Free Software Foundation; either version
|
|
|
|
* 2 of the License, or (at your option) any later version.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
2005-12-14 00:25:44 -07:00
|
|
|
#include <linux/random.h>
|
2005-08-12 06:26:18 -06:00
|
|
|
|
|
|
|
#include <net/inet_connection_sock.h>
|
|
|
|
#include <net/inet_hashtables.h>
|
|
|
|
#include <net/inet6_hashtables.h>
|
2005-12-14 00:25:44 -07:00
|
|
|
#include <net/ip.h>
|
2005-08-12 06:26:18 -06:00
|
|
|
|
2006-04-09 23:48:59 -06:00
|
|
|
void __inet6_hash(struct inet_hashinfo *hashinfo,
|
|
|
|
struct sock *sk)
|
|
|
|
{
|
|
|
|
struct hlist_head *list;
|
|
|
|
rwlock_t *lock;
|
|
|
|
|
|
|
|
BUG_TRAP(sk_unhashed(sk));
|
|
|
|
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
|
|
list = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
|
|
|
|
lock = &hashinfo->lhash_lock;
|
|
|
|
inet_listen_wlock(hashinfo);
|
|
|
|
} else {
|
|
|
|
unsigned int hash;
|
|
|
|
sk->sk_hash = hash = inet6_sk_ehashfn(sk);
|
|
|
|
hash &= (hashinfo->ehash_size - 1);
|
|
|
|
list = &hashinfo->ehash[hash].chain;
|
|
|
|
lock = &hashinfo->ehash[hash].lock;
|
|
|
|
write_lock(lock);
|
|
|
|
}
|
|
|
|
|
|
|
|
__sk_add_node(sk, list);
|
|
|
|
sock_prot_inc_use(sk->sk_prot);
|
|
|
|
write_unlock(lock);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__inet6_hash);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
|
|
|
|
* we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
|
|
|
|
*
|
|
|
|
* The sockhash lock must be held as a reader here.
|
|
|
|
*/
|
|
|
|
struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo,
|
|
|
|
const struct in6_addr *saddr,
|
|
|
|
const u16 sport,
|
|
|
|
const struct in6_addr *daddr,
|
|
|
|
const u16 hnum,
|
|
|
|
const int dif)
|
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
const struct hlist_node *node;
|
2006-09-27 19:43:07 -06:00
|
|
|
const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
|
2006-04-09 23:48:59 -06:00
|
|
|
/* Optimize here for direct hit, only listening connections can
|
|
|
|
* have wildcards anyways.
|
|
|
|
*/
|
|
|
|
unsigned int hash = inet6_ehashfn(daddr, hnum, saddr, sport);
|
|
|
|
struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
|
|
|
|
|
|
|
|
prefetch(head->chain.first);
|
|
|
|
read_lock(&head->lock);
|
|
|
|
sk_for_each(sk, node, &head->chain) {
|
|
|
|
/* For IPV6 do the cheaper port and family tests first. */
|
|
|
|
if (INET6_MATCH(sk, hash, saddr, daddr, ports, dif))
|
|
|
|
goto hit; /* You sunk my battleship! */
|
|
|
|
}
|
|
|
|
/* Must check for a TIME_WAIT'er before going to listener hash. */
|
|
|
|
sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
|
|
|
|
const struct inet_timewait_sock *tw = inet_twsk(sk);
|
|
|
|
|
2006-09-27 19:43:07 -06:00
|
|
|
if(*((__portpair *)&(tw->tw_dport)) == ports &&
|
2006-04-09 23:48:59 -06:00
|
|
|
sk->sk_family == PF_INET6) {
|
|
|
|
const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
|
|
|
|
|
|
|
|
if (ipv6_addr_equal(&tw6->tw_v6_daddr, saddr) &&
|
|
|
|
ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr) &&
|
|
|
|
(!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
|
|
|
|
goto hit;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
read_unlock(&head->lock);
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
hit:
|
|
|
|
sock_hold(sk);
|
|
|
|
read_unlock(&head->lock);
|
|
|
|
return sk;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__inet6_lookup_established);
|
|
|
|
|
2005-08-12 06:26:18 -06:00
|
|
|
struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
|
|
|
|
const struct in6_addr *daddr,
|
|
|
|
const unsigned short hnum, const int dif)
|
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
const struct hlist_node *node;
|
|
|
|
struct sock *result = NULL;
|
|
|
|
int score, hiscore = 0;
|
|
|
|
|
|
|
|
read_lock(&hashinfo->lhash_lock);
|
|
|
|
sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
|
|
|
|
if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) {
|
|
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
|
|
|
|
score = 1;
|
|
|
|
if (!ipv6_addr_any(&np->rcv_saddr)) {
|
|
|
|
if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
|
|
|
|
continue;
|
|
|
|
score++;
|
|
|
|
}
|
|
|
|
if (sk->sk_bound_dev_if) {
|
|
|
|
if (sk->sk_bound_dev_if != dif)
|
|
|
|
continue;
|
|
|
|
score++;
|
|
|
|
}
|
|
|
|
if (score == 3) {
|
|
|
|
result = sk;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (score > hiscore) {
|
|
|
|
hiscore = score;
|
|
|
|
result = sk;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (result)
|
|
|
|
sock_hold(result);
|
|
|
|
read_unlock(&hashinfo->lhash_lock);
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(inet6_lookup_listener);
|
|
|
|
|
|
|
|
struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
|
|
|
|
const struct in6_addr *saddr, const u16 sport,
|
|
|
|
const struct in6_addr *daddr, const u16 dport,
|
|
|
|
const int dif)
|
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
|
|
|
|
local_bh_disable();
|
|
|
|
sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif);
|
|
|
|
local_bh_enable();
|
|
|
|
|
|
|
|
return sk;
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(inet6_lookup);
|
2005-12-14 00:25:44 -07:00
|
|
|
|
|
|
|
static int __inet6_check_established(struct inet_timewait_death_row *death_row,
|
|
|
|
struct sock *sk, const __u16 lport,
|
|
|
|
struct inet_timewait_sock **twp)
|
|
|
|
{
|
|
|
|
struct inet_hashinfo *hinfo = death_row->hashinfo;
|
2006-03-13 15:26:12 -07:00
|
|
|
struct inet_sock *inet = inet_sk(sk);
|
2005-12-14 00:25:44 -07:00
|
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
const struct in6_addr *daddr = &np->rcv_saddr;
|
|
|
|
const struct in6_addr *saddr = &np->daddr;
|
|
|
|
const int dif = sk->sk_bound_dev_if;
|
2006-09-27 19:43:07 -06:00
|
|
|
const __portpair ports = INET_COMBINED_PORTS(inet->dport, lport);
|
2005-12-14 00:25:44 -07:00
|
|
|
const unsigned int hash = inet6_ehashfn(daddr, inet->num, saddr,
|
|
|
|
inet->dport);
|
|
|
|
struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
|
|
|
|
struct sock *sk2;
|
|
|
|
const struct hlist_node *node;
|
|
|
|
struct inet_timewait_sock *tw;
|
|
|
|
|
|
|
|
prefetch(head->chain.first);
|
|
|
|
write_lock(&head->lock);
|
|
|
|
|
|
|
|
/* Check TIME-WAIT sockets first. */
|
|
|
|
sk_for_each(sk2, node, &(head + hinfo->ehash_size)->chain) {
|
|
|
|
const struct inet6_timewait_sock *tw6 = inet6_twsk(sk2);
|
|
|
|
|
|
|
|
tw = inet_twsk(sk2);
|
|
|
|
|
2006-09-27 19:43:07 -06:00
|
|
|
if(*((__portpair *)&(tw->tw_dport)) == ports &&
|
2005-12-14 00:25:44 -07:00
|
|
|
sk2->sk_family == PF_INET6 &&
|
|
|
|
ipv6_addr_equal(&tw6->tw_v6_daddr, saddr) &&
|
|
|
|
ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr) &&
|
|
|
|
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) {
|
|
|
|
if (twsk_unique(sk, sk2, twp))
|
|
|
|
goto unique;
|
|
|
|
else
|
|
|
|
goto not_unique;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
tw = NULL;
|
|
|
|
|
|
|
|
/* And established part... */
|
|
|
|
sk_for_each(sk2, node, &head->chain) {
|
|
|
|
if (INET6_MATCH(sk2, hash, saddr, daddr, ports, dif))
|
|
|
|
goto not_unique;
|
|
|
|
}
|
|
|
|
|
|
|
|
unique:
|
2006-03-13 15:26:12 -07:00
|
|
|
/* Must record num and sport now. Otherwise we will see
|
|
|
|
* in hash table socket with a funny identity. */
|
|
|
|
inet->num = lport;
|
|
|
|
inet->sport = htons(lport);
|
2005-12-14 00:25:44 -07:00
|
|
|
BUG_TRAP(sk_unhashed(sk));
|
|
|
|
__sk_add_node(sk, &head->chain);
|
|
|
|
sk->sk_hash = hash;
|
|
|
|
sock_prot_inc_use(sk->sk_prot);
|
|
|
|
write_unlock(&head->lock);
|
|
|
|
|
|
|
|
if (twp != NULL) {
|
|
|
|
*twp = tw;
|
|
|
|
NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
|
|
|
|
} else if (tw != NULL) {
|
|
|
|
/* Silly. Should hash-dance instead... */
|
|
|
|
inet_twsk_deschedule(tw, death_row);
|
|
|
|
NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
|
|
|
|
|
|
|
|
inet_twsk_put(tw);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
not_unique:
|
|
|
|
write_unlock(&head->lock);
|
|
|
|
return -EADDRNOTAVAIL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline u32 inet6_sk_port_offset(const struct sock *sk)
|
|
|
|
{
|
|
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
return secure_ipv6_port_ephemeral(np->rcv_saddr.s6_addr32,
|
|
|
|
np->daddr.s6_addr32,
|
|
|
|
inet->dport);
|
|
|
|
}
|
|
|
|
|
|
|
|
int inet6_hash_connect(struct inet_timewait_death_row *death_row,
|
|
|
|
struct sock *sk)
|
|
|
|
{
|
|
|
|
struct inet_hashinfo *hinfo = death_row->hashinfo;
|
|
|
|
const unsigned short snum = inet_sk(sk)->num;
|
|
|
|
struct inet_bind_hashbucket *head;
|
|
|
|
struct inet_bind_bucket *tb;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (snum == 0) {
|
|
|
|
const int low = sysctl_local_port_range[0];
|
|
|
|
const int high = sysctl_local_port_range[1];
|
|
|
|
const int range = high - low;
|
|
|
|
int i, port;
|
|
|
|
static u32 hint;
|
|
|
|
const u32 offset = hint + inet6_sk_port_offset(sk);
|
|
|
|
struct hlist_node *node;
|
|
|
|
struct inet_timewait_sock *tw = NULL;
|
|
|
|
|
|
|
|
local_bh_disable();
|
|
|
|
for (i = 1; i <= range; i++) {
|
|
|
|
port = low + (i + offset) % range;
|
|
|
|
head = &hinfo->bhash[inet_bhashfn(port, hinfo->bhash_size)];
|
|
|
|
spin_lock(&head->lock);
|
|
|
|
|
|
|
|
/* Does not bother with rcv_saddr checks,
|
|
|
|
* because the established check is already
|
|
|
|
* unique enough.
|
|
|
|
*/
|
|
|
|
inet_bind_bucket_for_each(tb, node, &head->chain) {
|
|
|
|
if (tb->port == port) {
|
|
|
|
BUG_TRAP(!hlist_empty(&tb->owners));
|
|
|
|
if (tb->fastreuse >= 0)
|
|
|
|
goto next_port;
|
|
|
|
if (!__inet6_check_established(death_row,
|
|
|
|
sk, port,
|
|
|
|
&tw))
|
|
|
|
goto ok;
|
|
|
|
goto next_port;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
|
|
|
|
head, port);
|
|
|
|
if (!tb) {
|
|
|
|
spin_unlock(&head->lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
tb->fastreuse = -1;
|
|
|
|
goto ok;
|
|
|
|
|
|
|
|
next_port:
|
|
|
|
spin_unlock(&head->lock);
|
|
|
|
}
|
|
|
|
local_bh_enable();
|
|
|
|
|
|
|
|
return -EADDRNOTAVAIL;
|
|
|
|
|
|
|
|
ok:
|
|
|
|
hint += i;
|
|
|
|
|
|
|
|
/* Head lock still held and bh's disabled */
|
|
|
|
inet_bind_hash(sk, tb, port);
|
|
|
|
if (sk_unhashed(sk)) {
|
|
|
|
inet_sk(sk)->sport = htons(port);
|
|
|
|
__inet6_hash(hinfo, sk);
|
|
|
|
}
|
|
|
|
spin_unlock(&head->lock);
|
|
|
|
|
|
|
|
if (tw) {
|
|
|
|
inet_twsk_deschedule(tw, death_row);
|
|
|
|
inet_twsk_put(tw);
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = 0;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
head = &hinfo->bhash[inet_bhashfn(snum, hinfo->bhash_size)];
|
|
|
|
tb = inet_csk(sk)->icsk_bind_hash;
|
|
|
|
spin_lock_bh(&head->lock);
|
|
|
|
|
|
|
|
if (sk_head(&tb->owners) == sk && sk->sk_bind_node.next == NULL) {
|
|
|
|
__inet6_hash(hinfo, sk);
|
|
|
|
spin_unlock_bh(&head->lock);
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
spin_unlock(&head->lock);
|
|
|
|
/* No definite answer... Walk to established hash table */
|
|
|
|
ret = __inet6_check_established(death_row, sk, snum, NULL);
|
|
|
|
out:
|
|
|
|
local_bh_enable();
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
EXPORT_SYMBOL_GPL(inet6_hash_connect);
|