summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--include/net/inet_hashtables.h9
-rw-r--r--net/ipv4/inet_diag.c4
-rw-r--r--net/ipv4/inet_hashtables.c148
-rw-r--r--net/ipv4/tcp_ipv4.c8
-rw-r--r--net/ipv6/inet6_hashtables.c94
5 files changed, 147 insertions, 116 deletions
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index ec7ee2e46d8..f44bb5c77a7 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -99,9 +99,16 @@ struct inet_bind_hashbucket {
struct hlist_head chain;
};
+/*
+ * Sockets can be hashed in established or listening table
+ * We must use different 'nulls' end-of-chain value for listening
+ * hash table, or we might find a socket that was closed and
+ * reallocated/inserted into established hash table
+ */
+#define LISTENING_NULLS_BASE (1U << 29)
struct inet_listen_hashbucket {
spinlock_t lock;
- struct hlist_head head;
+ struct hlist_nulls_head head;
};
/* This is for listening sockets, thus all sockets which possess wildcards. */
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 998a78f169f..588a7796e3e 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -720,13 +720,13 @@ static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
struct sock *sk;
- struct hlist_node *node;
+ struct hlist_nulls_node *node;
struct inet_listen_hashbucket *ilb;
num = 0;
ilb = &hashinfo->listening_hash[i];
spin_lock_bh(&ilb->lock);
- sk_for_each(sk, node, &ilb->head) {
+ sk_nulls_for_each(sk, node, &ilb->head) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num) {
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 4c273a9981a..11fcb87a1fd 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -110,78 +110,79 @@ void __inet_inherit_port(struct sock *sk, struct sock *child)
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)
+{
+ int score = -1;
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (net_eq(sock_net(sk), net) && inet->num == hnum &&
+ !ipv6_only_sock(sk)) {
+ __be32 rcv_saddr = inet->rcv_saddr;
+ score = sk->sk_family == PF_INET ? 1 : 0;
+ if (rcv_saddr) {
+ if (rcv_saddr != daddr)
+ return -1;
+ score += 2;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ return -1;
+ score += 2;
+ }
+ }
+ return score;
+}
+
/*
* Don't inline this cruft. 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.
*/
-static struct sock *inet_lookup_listener_slow(struct net *net,
- const struct hlist_head *head,
- const __be32 daddr,
- const unsigned short hnum,
- const int dif)
-{
- struct sock *result = NULL, *sk;
- const struct hlist_node *node;
- int hiscore = -1;
-
- sk_for_each(sk, node, head) {
- const struct inet_sock *inet = inet_sk(sk);
-
- if (net_eq(sock_net(sk), net) && inet->num == hnum &&
- !ipv6_only_sock(sk)) {
- const __be32 rcv_saddr = inet->rcv_saddr;
- int score = sk->sk_family == PF_INET ? 1 : 0;
-
- if (rcv_saddr) {
- if (rcv_saddr != daddr)
- continue;
- score += 2;
- }
- if (sk->sk_bound_dev_if) {
- if (sk->sk_bound_dev_if != dif)
- continue;
- score += 2;
- }
- if (score == 5)
- return sk;
- if (score > hiscore) {
- hiscore = score;
- result = sk;
- }
- }
- }
- return result;
-}
-/* Optimize the common listener case. */
+
struct sock *__inet_lookup_listener(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 daddr, const unsigned short hnum,
const int dif)
{
- struct sock *sk = NULL;
- struct inet_listen_hashbucket *ilb;
+ struct sock *sk, *result;
+ struct hlist_nulls_node *node;
+ unsigned int hash = inet_lhashfn(net, hnum);
+ struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
+ int score, hiscore;
- ilb = &hashinfo->listening_hash[inet_lhashfn(net, hnum)];
- spin_lock(&ilb->lock);
- if (!hlist_empty(&ilb->head)) {
- const struct inet_sock *inet = inet_sk((sk = __sk_head(&ilb->head)));
-
- if (inet->num == hnum && !sk->sk_node.next &&
- (!inet->rcv_saddr || inet->rcv_saddr == daddr) &&
- (sk->sk_family == PF_INET || !ipv6_only_sock(sk)) &&
- !sk->sk_bound_dev_if && net_eq(sock_net(sk), net))
- goto sherry_cache;
- sk = inet_lookup_listener_slow(net, &ilb->head, daddr, hnum, dif);
+ rcu_read_lock();
+begin:
+ result = NULL;
+ hiscore = -1;
+ sk_nulls_for_each_rcu(sk, node, &ilb->head) {
+ score = compute_score(sk, net, hnum, daddr, dif);
+ if (score > hiscore) {
+ result = sk;
+ hiscore = score;
+ }
}
- if (sk) {
-sherry_cache:
- sock_hold(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;
+ }
}
- spin_unlock(&ilb->lock);
- return sk;
+ rcu_read_unlock();
+ return result;
}
EXPORT_SYMBOL_GPL(__inet_lookup_listener);
@@ -370,7 +371,7 @@ static void __inet_hash(struct sock *sk)
ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
spin_lock(&ilb->lock);
- __sk_add_node(sk, &ilb->head);
+ __sk_nulls_add_node_rcu(sk, &ilb->head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
spin_unlock(&ilb->lock);
}
@@ -388,26 +389,22 @@ EXPORT_SYMBOL_GPL(inet_hash);
void inet_unhash(struct sock *sk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
+ spinlock_t *lock;
+ int done;
if (sk_unhashed(sk))
return;
- if (sk->sk_state == TCP_LISTEN) {
- struct inet_listen_hashbucket *ilb;
+ if (sk->sk_state == TCP_LISTEN)
+ lock = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)].lock;
+ else
+ lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
- ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
- spin_lock_bh(&ilb->lock);
- if (__sk_del_node_init(sk))
- sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
- spin_unlock_bh(&ilb->lock);
- } else {
- spinlock_t *lock = inet_ehash_lockp(hashinfo, sk->sk_hash);
-
- spin_lock_bh(lock);
- if (__sk_nulls_del_node_init_rcu(sk))
- sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
- spin_unlock_bh(lock);
- }
+ spin_lock_bh(lock);
+ done =__sk_nulls_del_node_init_rcu(sk);
+ spin_unlock_bh(lock);
+ if (done)
+ sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
}
EXPORT_SYMBOL_GPL(inet_unhash);
@@ -526,8 +523,11 @@ void inet_hashinfo_init(struct inet_hashinfo *h)
{
int i;
- for (i = 0; i < INET_LHTABLE_SIZE; i++)
+ for (i = 0; i < INET_LHTABLE_SIZE; i++) {
spin_lock_init(&h->listening_hash[i].lock);
+ INIT_HLIST_NULLS_HEAD(&h->listening_hash[i].head,
+ i + LISTENING_NULLS_BASE);
+ }
}
EXPORT_SYMBOL_GPL(inet_hashinfo_init);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index a81caa1be0c..cab2458f86f 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1868,7 +1868,7 @@ static inline struct inet_timewait_sock *tw_next(struct inet_timewait_sock *tw)
static void *listening_get_next(struct seq_file *seq, void *cur)
{
struct inet_connection_sock *icsk;
- struct hlist_node *node;
+ struct hlist_nulls_node *node;
struct sock *sk = cur;
struct inet_listen_hashbucket *ilb;
struct tcp_iter_state *st = seq->private;
@@ -1878,7 +1878,7 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
st->bucket = 0;
ilb = &tcp_hashinfo.listening_hash[0];
spin_lock_bh(&ilb->lock);
- sk = sk_head(&ilb->head);
+ sk = sk_nulls_head(&ilb->head);
goto get_sk;
}
ilb = &tcp_hashinfo.listening_hash[st->bucket];
@@ -1914,7 +1914,7 @@ get_req:
sk = sk_next(sk);
}
get_sk:
- sk_for_each_from(sk, node) {
+ sk_nulls_for_each_from(sk, node) {
if (sk->sk_family == st->family && net_eq(sock_net(sk), net)) {
cur = sk;
goto out;
@@ -1935,7 +1935,7 @@ start_req:
if (++st->bucket < INET_LHTABLE_SIZE) {
ilb = &tcp_hashinfo.listening_hash[st->bucket];
spin_lock_bh(&ilb->lock);
- sk = sk_head(&ilb->head);
+ sk = sk_nulls_head(&ilb->head);
goto get_sk;
}
cur = NULL;
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index e0fd68187f8..8fe267feb81 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -33,7 +33,7 @@ void __inet6_hash(struct sock *sk)
ilb = &hashinfo->listening_hash[inet_sk_listen_hashfn(sk)];
spin_lock(&ilb->lock);
- __sk_add_node(sk, &ilb->head);
+ __sk_nulls_add_node_rcu(sk, &ilb->head);
spin_unlock(&ilb->lock);
} else {
unsigned int hash;
@@ -118,47 +118,71 @@ out:
}
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;
- struct inet_listen_hashbucket *ilb;
-
- ilb = &hashinfo->listening_hash[inet_lhashfn(net, hnum)];
- spin_lock(&ilb->lock);
- sk_for_each(sk, node, &ilb->head) {
- 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 (result)
- sock_hold(result);
- spin_unlock(&ilb->lock);
+ /*
+ * 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;
+ }
+ }
+ rcu_read_unlock();
return result;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 20:11:08 +0000