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path: root/net/ipv6/inet6_hashtables.c
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Diffstat (limited to 'net/ipv6/inet6_hashtables.c')
-rw-r--r--net/ipv6/inet6_hashtables.c182
1 files changed, 115 insertions, 67 deletions
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index 1646a565825..8fe267feb81 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -25,26 +25,30 @@
void __inet6_hash(struct sock *sk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
- struct hlist_head *list;
- rwlock_t *lock;
WARN_ON(!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);
+ struct inet_listen_hashbucket *ilb;
+
+ ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
+ spin_lock(&ilb->lock);
+ __sk_nulls_add_node_rcu(sk, &ilb->head);
+ spin_unlock(&ilb->lock);
} else {
unsigned int hash;
+ struct hlist_nulls_head *list;
+ spinlock_t *lock;
+
sk->sk_hash = hash = inet6_sk_ehashfn(sk);
list = &inet_ehash_bucket(hashinfo, hash)->chain;
lock = inet_ehash_lockp(hashinfo, hash);
- write_lock(lock);
+ spin_lock(lock);
+ __sk_nulls_add_node_rcu(sk, list);
+ spin_unlock(lock);
}
- __sk_add_node(sk, list);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
- write_unlock(lock);
}
EXPORT_SYMBOL(__inet6_hash);
@@ -63,77 +67,122 @@ struct sock *__inet6_lookup_established(struct net *net,
const int dif)
{
struct sock *sk;
- const struct hlist_node *node;
+ const struct hlist_nulls_node *node;
const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
/* Optimize here for direct hit, only listening connections can
* have wildcards anyways.
*/
unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
- struct inet_ehash_bucket *head = inet_ehash_bucket(hashinfo, hash);
- rwlock_t *lock = inet_ehash_lockp(hashinfo, hash);
+ unsigned int slot = hash & (hashinfo->ehash_size - 1);
+ struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
- prefetch(head->chain.first);
- read_lock(lock);
- sk_for_each(sk, node, &head->chain) {
+
+ rcu_read_lock();
+begin:
+ sk_nulls_for_each_rcu(sk, node, &head->chain) {
/* For IPV6 do the cheaper port and family tests first. */
- if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif))
- goto hit; /* You sunk my battleship! */
+ if (INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt)))
+ goto begintw;
+ if (!INET6_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ sock_put(sk);
+ goto begin;
+ }
+ goto out;
+ }
}
+ if (get_nulls_value(node) != slot)
+ goto begin;
+
+begintw:
/* Must check for a TIME_WAIT'er before going to listener hash. */
- sk_for_each(sk, node, &head->twchain) {
- if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif))
- goto hit;
+ sk_nulls_for_each_rcu(sk, node, &head->twchain) {
+ if (INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ if (unlikely(!atomic_inc_not_zero(&sk->sk_refcnt))) {
+ sk = NULL;
+ goto out;
+ }
+ if (!INET6_TW_MATCH(sk, net, hash, saddr, daddr, ports, dif)) {
+ sock_put(sk);
+ goto begintw;
+ }
+ goto out;
+ }
}
- read_unlock(lock);
- return NULL;
-
-hit:
- sock_hold(sk);
- read_unlock(lock);
+ if (get_nulls_value(node) != slot)
+ goto begintw;
+ sk = NULL;
+out:
+ rcu_read_unlock();
return sk;
}
EXPORT_SYMBOL(__inet6_lookup_established);
+static int inline compute_score(struct sock *sk, struct net *net,
+ const unsigned short hnum,
+ const struct in6_addr *daddr,
+ const int dif)
+{
+ int score = -1;
+
+ if (net_eq(sock_net(sk), net) && 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))
+ return -1;
+ score++;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ return -1;
+ score++;
+ }
+ }
+ return score;
+}
+
struct sock *inet6_lookup_listener(struct net *net,
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(net, hnum)]) {
- if (net_eq(sock_net(sk), net) && 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;
- }
+ const struct hlist_nulls_node *node;
+ struct sock *result;
+ int score, hiscore;
+ unsigned int hash = inet_lhashfn(net, hnum);
+ struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
+
+ rcu_read_lock();
+begin:
+ result = NULL;
+ hiscore = -1;
+ sk_nulls_for_each(sk, node, &ilb->head) {
+ score = compute_score(sk, net, hnum, daddr, dif);
+ if (score > hiscore) {
+ hiscore = score;
+ result = sk;
+ }
+ }
+ /*
+ * 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) != hash + LISTENING_NULLS_BASE)
+ goto begin;
+ if (result) {
+ if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
+ result = NULL;
+ else if (unlikely(compute_score(result, net, hnum, daddr,
+ dif) < hiscore)) {
+ sock_put(result);
+ goto begin;
}
}
- if (result)
- sock_hold(result);
- read_unlock(&hashinfo->lhash_lock);
+ rcu_read_unlock();
return result;
}
@@ -170,16 +219,15 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
inet->dport);
struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
- rwlock_t *lock = inet_ehash_lockp(hinfo, hash);
+ spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
struct sock *sk2;
- const struct hlist_node *node;
+ const struct hlist_nulls_node *node;
struct inet_timewait_sock *tw;
- prefetch(head->chain.first);
- write_lock(lock);
+ spin_lock(lock);
/* Check TIME-WAIT sockets first. */
- sk_for_each(sk2, node, &head->twchain) {
+ sk_nulls_for_each(sk2, node, &head->twchain) {
tw = inet_twsk(sk2);
if (INET6_TW_MATCH(sk2, net, hash, saddr, daddr, ports, dif)) {
@@ -192,7 +240,7 @@ static int __inet6_check_established(struct inet_timewait_death_row *death_row,
tw = NULL;
/* And established part... */
- sk_for_each(sk2, node, &head->chain) {
+ sk_nulls_for_each(sk2, node, &head->chain) {
if (INET6_MATCH(sk2, net, hash, saddr, daddr, ports, dif))
goto not_unique;
}
@@ -203,10 +251,10 @@ unique:
inet->num = lport;
inet->sport = htons(lport);
WARN_ON(!sk_unhashed(sk));
- __sk_add_node(sk, &head->chain);
+ __sk_nulls_add_node_rcu(sk, &head->chain);
sk->sk_hash = hash;
+ spin_unlock(lock);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
- write_unlock(lock);
if (twp != NULL) {
*twp = tw;
@@ -221,7 +269,7 @@ unique:
return 0;
not_unique:
- write_unlock(lock);
+ spin_unlock(lock);
return -EADDRNOTAVAIL;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-29 13:46:04 +0000