692 lines
18 KiB
C
692 lines
18 KiB
C
/*
|
|
* 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 INET transport hashtables
|
|
*
|
|
* Authors: Lotsa people, from code originally in tcp
|
|
*
|
|
* 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>
|
|
#include <linux/random.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include <net/addrconf.h>
|
|
#include <net/inet_connection_sock.h>
|
|
#include <net/inet_hashtables.h>
|
|
#include <net/secure_seq.h>
|
|
#include <net/ip.h>
|
|
#include <net/tcp.h>
|
|
#include <net/sock_reuseport.h>
|
|
|
|
static u32 inet_ehashfn(const struct net *net, const __be32 laddr,
|
|
const __u16 lport, const __be32 faddr,
|
|
const __be16 fport)
|
|
{
|
|
static u32 inet_ehash_secret __read_mostly;
|
|
|
|
net_get_random_once(&inet_ehash_secret, sizeof(inet_ehash_secret));
|
|
|
|
return __inet_ehashfn(laddr, lport, faddr, fport,
|
|
inet_ehash_secret + net_hash_mix(net));
|
|
}
|
|
|
|
/* This function handles inet_sock, but also timewait and request sockets
|
|
* for IPv4/IPv6.
|
|
*/
|
|
u32 sk_ehashfn(const struct sock *sk)
|
|
{
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (sk->sk_family == AF_INET6 &&
|
|
!ipv6_addr_v4mapped(&sk->sk_v6_daddr))
|
|
return inet6_ehashfn(sock_net(sk),
|
|
&sk->sk_v6_rcv_saddr, sk->sk_num,
|
|
&sk->sk_v6_daddr, sk->sk_dport);
|
|
#endif
|
|
return inet_ehashfn(sock_net(sk),
|
|
sk->sk_rcv_saddr, sk->sk_num,
|
|
sk->sk_daddr, sk->sk_dport);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize a new local port bind bucket.
|
|
* The bindhash mutex for snum's hash chain must be held here.
|
|
*/
|
|
struct inet_bind_bucket *inet_bind_bucket_create(struct kmem_cache *cachep,
|
|
struct net *net,
|
|
struct inet_bind_hashbucket *head,
|
|
const unsigned short snum)
|
|
{
|
|
struct inet_bind_bucket *tb = kmem_cache_alloc(cachep, GFP_ATOMIC);
|
|
|
|
if (tb) {
|
|
write_pnet(&tb->ib_net, net);
|
|
tb->port = snum;
|
|
tb->fastreuse = 0;
|
|
tb->fastreuseport = 0;
|
|
INIT_HLIST_HEAD(&tb->owners);
|
|
hlist_add_head(&tb->node, &head->chain);
|
|
}
|
|
return tb;
|
|
}
|
|
|
|
/*
|
|
* Caller must hold hashbucket lock for this tb with local BH disabled
|
|
*/
|
|
void inet_bind_bucket_destroy(struct kmem_cache *cachep, struct inet_bind_bucket *tb)
|
|
{
|
|
if (hlist_empty(&tb->owners)) {
|
|
__hlist_del(&tb->node);
|
|
kmem_cache_free(cachep, tb);
|
|
}
|
|
}
|
|
|
|
void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb,
|
|
const unsigned short snum)
|
|
{
|
|
inet_sk(sk)->inet_num = snum;
|
|
sk_add_bind_node(sk, &tb->owners);
|
|
inet_csk(sk)->icsk_bind_hash = tb;
|
|
}
|
|
|
|
/*
|
|
* Get rid of any references to a local port held by the given sock.
|
|
*/
|
|
static void __inet_put_port(struct sock *sk)
|
|
{
|
|
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
|
|
const int bhash = inet_bhashfn(sock_net(sk), inet_sk(sk)->inet_num,
|
|
hashinfo->bhash_size);
|
|
struct inet_bind_hashbucket *head = &hashinfo->bhash[bhash];
|
|
struct inet_bind_bucket *tb;
|
|
|
|
spin_lock(&head->lock);
|
|
tb = inet_csk(sk)->icsk_bind_hash;
|
|
__sk_del_bind_node(sk);
|
|
inet_csk(sk)->icsk_bind_hash = NULL;
|
|
inet_sk(sk)->inet_num = 0;
|
|
inet_bind_bucket_destroy(hashinfo->bind_bucket_cachep, tb);
|
|
spin_unlock(&head->lock);
|
|
}
|
|
|
|
void inet_put_port(struct sock *sk)
|
|
{
|
|
local_bh_disable();
|
|
__inet_put_port(sk);
|
|
local_bh_enable();
|
|
}
|
|
EXPORT_SYMBOL(inet_put_port);
|
|
|
|
int __inet_inherit_port(const struct sock *sk, struct sock *child)
|
|
{
|
|
struct inet_hashinfo *table = sk->sk_prot->h.hashinfo;
|
|
unsigned short port = inet_sk(child)->inet_num;
|
|
const int bhash = inet_bhashfn(sock_net(sk), port,
|
|
table->bhash_size);
|
|
struct inet_bind_hashbucket *head = &table->bhash[bhash];
|
|
struct inet_bind_bucket *tb;
|
|
|
|
spin_lock(&head->lock);
|
|
tb = inet_csk(sk)->icsk_bind_hash;
|
|
if (unlikely(!tb)) {
|
|
spin_unlock(&head->lock);
|
|
return -ENOENT;
|
|
}
|
|
if (tb->port != port) {
|
|
/* NOTE: using tproxy and redirecting skbs to a proxy
|
|
* on a different listener port breaks the assumption
|
|
* that the listener socket's icsk_bind_hash is the same
|
|
* as that of the child socket. We have to look up or
|
|
* create a new bind bucket for the child here. */
|
|
inet_bind_bucket_for_each(tb, &head->chain) {
|
|
if (net_eq(ib_net(tb), sock_net(sk)) &&
|
|
tb->port == port)
|
|
break;
|
|
}
|
|
if (!tb) {
|
|
tb = inet_bind_bucket_create(table->bind_bucket_cachep,
|
|
sock_net(sk), head, port);
|
|
if (!tb) {
|
|
spin_unlock(&head->lock);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
}
|
|
inet_bind_hash(child, tb, port);
|
|
spin_unlock(&head->lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__inet_inherit_port);
|
|
|
|
static inline int compute_score(struct sock *sk, struct net *net,
|
|
const unsigned short hnum, const __be32 daddr,
|
|
const int dif, bool exact_dif)
|
|
{
|
|
int score = -1;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (net_eq(sock_net(sk), net) && inet->inet_num == hnum &&
|
|
!ipv6_only_sock(sk)) {
|
|
__be32 rcv_saddr = inet->inet_rcv_saddr;
|
|
score = sk->sk_family == PF_INET ? 2 : 1;
|
|
if (rcv_saddr) {
|
|
if (rcv_saddr != daddr)
|
|
return -1;
|
|
score += 4;
|
|
}
|
|
if (sk->sk_bound_dev_if || exact_dif) {
|
|
if (sk->sk_bound_dev_if != dif)
|
|
return -1;
|
|
score += 4;
|
|
}
|
|
if (sk->sk_incoming_cpu == raw_smp_processor_id())
|
|
score++;
|
|
}
|
|
return score;
|
|
}
|
|
|
|
/*
|
|
* Here are some nice properties to exploit here. The BSD API
|
|
* does not allow a listening sock to specify the remote port nor the
|
|
* remote address for the connection. So always assume those are both
|
|
* wildcarded during the search since they can never be otherwise.
|
|
*/
|
|
|
|
/* called with rcu_read_lock() : No refcount taken on the socket */
|
|
struct sock *__inet_lookup_listener(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
struct sk_buff *skb, int doff,
|
|
const __be32 saddr, __be16 sport,
|
|
const __be32 daddr, const unsigned short hnum,
|
|
const int dif)
|
|
{
|
|
unsigned int hash = inet_lhashfn(net, hnum);
|
|
struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
|
|
int score, hiscore = 0, matches = 0, reuseport = 0;
|
|
bool exact_dif = inet_exact_dif_match(net, skb);
|
|
struct sock *sk, *result = NULL;
|
|
u32 phash = 0;
|
|
|
|
sk_for_each_rcu(sk, &ilb->head) {
|
|
score = compute_score(sk, net, hnum, daddr, dif, exact_dif);
|
|
if (score > hiscore) {
|
|
reuseport = sk->sk_reuseport;
|
|
if (reuseport) {
|
|
phash = inet_ehashfn(net, daddr, hnum,
|
|
saddr, sport);
|
|
result = reuseport_select_sock(sk, phash,
|
|
skb, doff);
|
|
if (result)
|
|
return result;
|
|
matches = 1;
|
|
}
|
|
result = sk;
|
|
hiscore = score;
|
|
} else if (score == hiscore && reuseport) {
|
|
matches++;
|
|
if (reciprocal_scale(phash, matches) == 0)
|
|
result = sk;
|
|
phash = next_pseudo_random32(phash);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__inet_lookup_listener);
|
|
|
|
/* All sockets share common refcount, but have different destructors */
|
|
void sock_gen_put(struct sock *sk)
|
|
{
|
|
if (!atomic_dec_and_test(&sk->sk_refcnt))
|
|
return;
|
|
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
inet_twsk_free(inet_twsk(sk));
|
|
else if (sk->sk_state == TCP_NEW_SYN_RECV)
|
|
reqsk_free(inet_reqsk(sk));
|
|
else
|
|
sk_free(sk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sock_gen_put);
|
|
|
|
void sock_edemux(struct sk_buff *skb)
|
|
{
|
|
sock_gen_put(skb->sk);
|
|
}
|
|
EXPORT_SYMBOL(sock_edemux);
|
|
|
|
struct sock *__inet_lookup_established(struct net *net,
|
|
struct inet_hashinfo *hashinfo,
|
|
const __be32 saddr, const __be16 sport,
|
|
const __be32 daddr, const u16 hnum,
|
|
const int dif)
|
|
{
|
|
INET_ADDR_COOKIE(acookie, saddr, daddr);
|
|
const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
|
|
struct sock *sk;
|
|
const struct hlist_nulls_node *node;
|
|
/* Optimize here for direct hit, only listening connections can
|
|
* have wildcards anyways.
|
|
*/
|
|
unsigned int hash = inet_ehashfn(net, daddr, hnum, saddr, sport);
|
|
unsigned int slot = hash & hashinfo->ehash_mask;
|
|
struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
|
|
|
|
begin:
|
|
sk_nulls_for_each_rcu(sk, node, &head->chain) {
|
|
if (sk->sk_hash != hash)
|
|
continue;
|
|
if (likely(INET_MATCH(sk, net, acookie,
|
|
saddr, daddr, ports, dif))) {
|
|
if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
|
|
goto out;
|
|
if (unlikely(!INET_MATCH(sk, net, acookie,
|
|
saddr, daddr, ports, dif))) {
|
|
sock_gen_put(sk);
|
|
goto begin;
|
|
}
|
|
goto found;
|
|
}
|
|
}
|
|
/*
|
|
* if the nulls value we got at the end of this lookup is
|
|
* not the expected one, we must restart lookup.
|
|
* We probably met an item that was moved to another chain.
|
|
*/
|
|
if (get_nulls_value(node) != slot)
|
|
goto begin;
|
|
out:
|
|
sk = NULL;
|
|
found:
|
|
return sk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__inet_lookup_established);
|
|
|
|
/* called with local bh disabled */
|
|
static int __inet_check_established(struct inet_timewait_death_row *death_row,
|
|
struct sock *sk, __u16 lport,
|
|
struct inet_timewait_sock **twp)
|
|
{
|
|
struct inet_hashinfo *hinfo = death_row->hashinfo;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
__be32 daddr = inet->inet_rcv_saddr;
|
|
__be32 saddr = inet->inet_daddr;
|
|
int dif = sk->sk_bound_dev_if;
|
|
INET_ADDR_COOKIE(acookie, saddr, daddr);
|
|
const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
|
|
struct net *net = sock_net(sk);
|
|
unsigned int hash = inet_ehashfn(net, daddr, lport,
|
|
saddr, inet->inet_dport);
|
|
struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
|
|
spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
|
|
struct sock *sk2;
|
|
const struct hlist_nulls_node *node;
|
|
struct inet_timewait_sock *tw = NULL;
|
|
|
|
spin_lock(lock);
|
|
|
|
sk_nulls_for_each(sk2, node, &head->chain) {
|
|
if (sk2->sk_hash != hash)
|
|
continue;
|
|
|
|
if (likely(INET_MATCH(sk2, net, acookie,
|
|
saddr, daddr, ports, dif))) {
|
|
if (sk2->sk_state == TCP_TIME_WAIT) {
|
|
tw = inet_twsk(sk2);
|
|
if (twsk_unique(sk, sk2, twp))
|
|
break;
|
|
}
|
|
goto not_unique;
|
|
}
|
|
}
|
|
|
|
/* Must record num and sport now. Otherwise we will see
|
|
* in hash table socket with a funny identity.
|
|
*/
|
|
inet->inet_num = lport;
|
|
inet->inet_sport = htons(lport);
|
|
sk->sk_hash = hash;
|
|
WARN_ON(!sk_unhashed(sk));
|
|
__sk_nulls_add_node_rcu(sk, &head->chain);
|
|
if (tw) {
|
|
sk_nulls_del_node_init_rcu((struct sock *)tw);
|
|
__NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
|
|
}
|
|
spin_unlock(lock);
|
|
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
|
|
|
|
if (twp) {
|
|
*twp = tw;
|
|
} else if (tw) {
|
|
/* Silly. Should hash-dance instead... */
|
|
inet_twsk_deschedule_put(tw);
|
|
}
|
|
return 0;
|
|
|
|
not_unique:
|
|
spin_unlock(lock);
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
static u32 inet_sk_port_offset(const struct sock *sk)
|
|
{
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
|
|
return secure_ipv4_port_ephemeral(inet->inet_rcv_saddr,
|
|
inet->inet_daddr,
|
|
inet->inet_dport);
|
|
}
|
|
|
|
/* insert a socket into ehash, and eventually remove another one
|
|
* (The another one can be a SYN_RECV or TIMEWAIT
|
|
*/
|
|
bool inet_ehash_insert(struct sock *sk, struct sock *osk)
|
|
{
|
|
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
|
|
struct hlist_nulls_head *list;
|
|
struct inet_ehash_bucket *head;
|
|
spinlock_t *lock;
|
|
bool ret = true;
|
|
|
|
WARN_ON_ONCE(!sk_unhashed(sk));
|
|
|
|
sk->sk_hash = sk_ehashfn(sk);
|
|
head = inet_ehash_bucket(hashinfo, sk->sk_hash);
|
|
list = &head->chain;
|
|
lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
|
|
|
|
spin_lock(lock);
|
|
if (osk) {
|
|
WARN_ON_ONCE(sk->sk_hash != osk->sk_hash);
|
|
ret = sk_nulls_del_node_init_rcu(osk);
|
|
}
|
|
if (ret)
|
|
__sk_nulls_add_node_rcu(sk, list);
|
|
spin_unlock(lock);
|
|
return ret;
|
|
}
|
|
|
|
bool inet_ehash_nolisten(struct sock *sk, struct sock *osk)
|
|
{
|
|
bool ok = inet_ehash_insert(sk, osk);
|
|
|
|
if (ok) {
|
|
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
|
|
} else {
|
|
percpu_counter_inc(sk->sk_prot->orphan_count);
|
|
sk->sk_state = TCP_CLOSE;
|
|
sock_set_flag(sk, SOCK_DEAD);
|
|
inet_csk_destroy_sock(sk);
|
|
}
|
|
return ok;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_ehash_nolisten);
|
|
|
|
static int inet_reuseport_add_sock(struct sock *sk,
|
|
struct inet_listen_hashbucket *ilb)
|
|
{
|
|
struct inet_bind_bucket *tb = inet_csk(sk)->icsk_bind_hash;
|
|
struct sock *sk2;
|
|
kuid_t uid = sock_i_uid(sk);
|
|
|
|
sk_for_each_rcu(sk2, &ilb->head) {
|
|
if (sk2 != sk &&
|
|
sk2->sk_family == sk->sk_family &&
|
|
ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
|
|
sk2->sk_bound_dev_if == sk->sk_bound_dev_if &&
|
|
inet_csk(sk2)->icsk_bind_hash == tb &&
|
|
sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
|
|
inet_rcv_saddr_equal(sk, sk2, false))
|
|
return reuseport_add_sock(sk, sk2);
|
|
}
|
|
|
|
/* Initial allocation may have already happened via setsockopt */
|
|
if (!rcu_access_pointer(sk->sk_reuseport_cb))
|
|
return reuseport_alloc(sk);
|
|
return 0;
|
|
}
|
|
|
|
int __inet_hash(struct sock *sk, struct sock *osk)
|
|
{
|
|
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
|
|
struct inet_listen_hashbucket *ilb;
|
|
int err = 0;
|
|
|
|
if (sk->sk_state != TCP_LISTEN) {
|
|
inet_ehash_nolisten(sk, osk);
|
|
return 0;
|
|
}
|
|
WARN_ON(!sk_unhashed(sk));
|
|
ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
|
|
|
|
spin_lock(&ilb->lock);
|
|
if (sk->sk_reuseport) {
|
|
err = inet_reuseport_add_sock(sk, ilb);
|
|
if (err)
|
|
goto unlock;
|
|
}
|
|
if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
|
|
sk->sk_family == AF_INET6)
|
|
hlist_add_tail_rcu(&sk->sk_node, &ilb->head);
|
|
else
|
|
hlist_add_head_rcu(&sk->sk_node, &ilb->head);
|
|
sock_set_flag(sk, SOCK_RCU_FREE);
|
|
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
|
|
unlock:
|
|
spin_unlock(&ilb->lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__inet_hash);
|
|
|
|
int inet_hash(struct sock *sk)
|
|
{
|
|
int err = 0;
|
|
|
|
if (sk->sk_state != TCP_CLOSE) {
|
|
local_bh_disable();
|
|
err = __inet_hash(sk, NULL);
|
|
local_bh_enable();
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_hash);
|
|
|
|
void inet_unhash(struct sock *sk)
|
|
{
|
|
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
|
|
spinlock_t *lock;
|
|
bool listener = false;
|
|
int done;
|
|
|
|
if (sk_unhashed(sk))
|
|
return;
|
|
|
|
if (sk->sk_state == TCP_LISTEN) {
|
|
lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
|
|
listener = true;
|
|
} else {
|
|
lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
|
|
}
|
|
spin_lock_bh(lock);
|
|
if (rcu_access_pointer(sk->sk_reuseport_cb))
|
|
reuseport_detach_sock(sk);
|
|
if (listener)
|
|
done = __sk_del_node_init(sk);
|
|
else
|
|
done = __sk_nulls_del_node_init_rcu(sk);
|
|
if (done)
|
|
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
|
|
spin_unlock_bh(lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_unhash);
|
|
|
|
int __inet_hash_connect(struct inet_timewait_death_row *death_row,
|
|
struct sock *sk, u32 port_offset,
|
|
int (*check_established)(struct inet_timewait_death_row *,
|
|
struct sock *, __u16, struct inet_timewait_sock **))
|
|
{
|
|
struct inet_hashinfo *hinfo = death_row->hashinfo;
|
|
struct inet_timewait_sock *tw = NULL;
|
|
struct inet_bind_hashbucket *head;
|
|
int port = inet_sk(sk)->inet_num;
|
|
struct net *net = sock_net(sk);
|
|
struct inet_bind_bucket *tb;
|
|
u32 remaining, offset;
|
|
int ret, i, low, high;
|
|
static u32 hint;
|
|
|
|
if (port) {
|
|
head = &hinfo->bhash[inet_bhashfn(net, port,
|
|
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) {
|
|
inet_ehash_nolisten(sk, NULL);
|
|
spin_unlock_bh(&head->lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&head->lock);
|
|
/* No definite answer... Walk to established hash table */
|
|
ret = check_established(death_row, sk, port, NULL);
|
|
local_bh_enable();
|
|
return ret;
|
|
}
|
|
|
|
inet_get_local_port_range(net, &low, &high);
|
|
high++; /* [32768, 60999] -> [32768, 61000[ */
|
|
remaining = high - low;
|
|
if (likely(remaining > 1))
|
|
remaining &= ~1U;
|
|
|
|
offset = (hint + port_offset) % remaining;
|
|
/* In first pass we try ports of @low parity.
|
|
* inet_csk_get_port() does the opposite choice.
|
|
*/
|
|
offset &= ~1U;
|
|
other_parity_scan:
|
|
port = low + offset;
|
|
for (i = 0; i < remaining; i += 2, port += 2) {
|
|
if (unlikely(port >= high))
|
|
port -= remaining;
|
|
if (inet_is_local_reserved_port(net, port))
|
|
continue;
|
|
head = &hinfo->bhash[inet_bhashfn(net, port,
|
|
hinfo->bhash_size)];
|
|
spin_lock_bh(&head->lock);
|
|
|
|
/* Does not bother with rcv_saddr checks, because
|
|
* the established check is already unique enough.
|
|
*/
|
|
inet_bind_bucket_for_each(tb, &head->chain) {
|
|
if (net_eq(ib_net(tb), net) && tb->port == port) {
|
|
if (tb->fastreuse >= 0 ||
|
|
tb->fastreuseport >= 0)
|
|
goto next_port;
|
|
WARN_ON(hlist_empty(&tb->owners));
|
|
if (!check_established(death_row, sk,
|
|
port, &tw))
|
|
goto ok;
|
|
goto next_port;
|
|
}
|
|
}
|
|
|
|
tb = inet_bind_bucket_create(hinfo->bind_bucket_cachep,
|
|
net, head, port);
|
|
if (!tb) {
|
|
spin_unlock_bh(&head->lock);
|
|
return -ENOMEM;
|
|
}
|
|
tb->fastreuse = -1;
|
|
tb->fastreuseport = -1;
|
|
goto ok;
|
|
next_port:
|
|
spin_unlock_bh(&head->lock);
|
|
cond_resched();
|
|
}
|
|
|
|
offset++;
|
|
if ((offset & 1) && remaining > 1)
|
|
goto other_parity_scan;
|
|
|
|
return -EADDRNOTAVAIL;
|
|
|
|
ok:
|
|
hint += i + 2;
|
|
|
|
/* Head lock still held and bh's disabled */
|
|
inet_bind_hash(sk, tb, port);
|
|
if (sk_unhashed(sk)) {
|
|
inet_sk(sk)->inet_sport = htons(port);
|
|
inet_ehash_nolisten(sk, (struct sock *)tw);
|
|
}
|
|
if (tw)
|
|
inet_twsk_bind_unhash(tw, hinfo);
|
|
spin_unlock(&head->lock);
|
|
if (tw)
|
|
inet_twsk_deschedule_put(tw);
|
|
local_bh_enable();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Bind a port for a connect operation and hash it.
|
|
*/
|
|
int inet_hash_connect(struct inet_timewait_death_row *death_row,
|
|
struct sock *sk)
|
|
{
|
|
u32 port_offset = 0;
|
|
|
|
if (!inet_sk(sk)->inet_num)
|
|
port_offset = inet_sk_port_offset(sk);
|
|
return __inet_hash_connect(death_row, sk, port_offset,
|
|
__inet_check_established);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_hash_connect);
|
|
|
|
void inet_hashinfo_init(struct inet_hashinfo *h)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < INET_LHTABLE_SIZE; i++) {
|
|
spin_lock_init(&h->listening_hash[i].lock);
|
|
INIT_HLIST_HEAD(&h->listening_hash[i].head);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_hashinfo_init);
|
|
|
|
int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo)
|
|
{
|
|
unsigned int locksz = sizeof(spinlock_t);
|
|
unsigned int i, nblocks = 1;
|
|
|
|
if (locksz != 0) {
|
|
/* allocate 2 cache lines or at least one spinlock per cpu */
|
|
nblocks = max(2U * L1_CACHE_BYTES / locksz, 1U);
|
|
nblocks = roundup_pow_of_two(nblocks * num_possible_cpus());
|
|
|
|
/* no more locks than number of hash buckets */
|
|
nblocks = min(nblocks, hashinfo->ehash_mask + 1);
|
|
|
|
hashinfo->ehash_locks = kvmalloc_array(nblocks, locksz, GFP_KERNEL);
|
|
if (!hashinfo->ehash_locks)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < nblocks; i++)
|
|
spin_lock_init(&hashinfo->ehash_locks[i]);
|
|
}
|
|
hashinfo->ehash_locks_mask = nblocks - 1;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_ehash_locks_alloc);
|