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authorEric Dumazet <edumazet@google.com>2016-04-01 08:52:15 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-04 22:11:19 -0400
commit2d331915a04144dad738e725769d8fac06ef6155 (patch)
tree5bf80c73627b0783603e8a46573db2cf50041280
parentee3cf32a4a5e6cf5ccc0f0de9865fda3ebc46436 (diff)
tcp/dccp: use rcu locking in inet_diag_find_one_icsk()
RX packet processing holds rcu_read_lock(), so we can remove pairs of rcu_read_lock()/rcu_read_unlock() in lookup functions if inet_diag also holds rcu before calling them. This is needed anyway as __inet_lookup_listener() and inet6_lookup_listener() will soon no longer increment refcount on the found listener. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/inet_diag.c7
-rw-r--r--net/ipv4/inet_hashtables.c4
-rw-r--r--net/ipv6/inet6_hashtables.c4
3 files changed, 5 insertions, 10 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 5fdb02f5598e..ea8df527b279 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -356,6 +356,7 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
{
struct sock *sk;
+ rcu_read_lock();
if (req->sdiag_family == AF_INET)
sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
req->id.idiag_dport, req->id.idiag_src[0],
@@ -376,9 +377,11 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
req->id.idiag_if);
}
#endif
- else
+ else {
+ rcu_read_unlock();
return ERR_PTR(-EINVAL);
-
+ }
+ rcu_read_unlock();
if (!sk)
return ERR_PTR(-ENOENT);
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index bc68eced0105..387338d71dcd 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -220,7 +220,6 @@ struct sock *__inet_lookup_listener(struct net *net,
bool select_ok = true;
u32 phash = 0;
- rcu_read_lock();
begin:
result = NULL;
hiscore = 0;
@@ -269,7 +268,6 @@ found:
goto begin;
}
}
- rcu_read_unlock();
return result;
}
EXPORT_SYMBOL_GPL(__inet_lookup_listener);
@@ -312,7 +310,6 @@ struct sock *__inet_lookup_established(struct net *net,
unsigned int slot = hash & hashinfo->ehash_mask;
struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
- rcu_read_lock();
begin:
sk_nulls_for_each_rcu(sk, node, &head->chain) {
if (sk->sk_hash != hash)
@@ -339,7 +336,6 @@ begin:
out:
sk = NULL;
found:
- rcu_read_unlock();
return sk;
}
EXPORT_SYMBOL_GPL(__inet_lookup_established);
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
index d253f32874c9..e6ef6ce1ed74 100644
--- a/net/ipv6/inet6_hashtables.c
+++ b/net/ipv6/inet6_hashtables.c
@@ -69,7 +69,6 @@ struct sock *__inet6_lookup_established(struct net *net,
struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
- rcu_read_lock();
begin:
sk_nulls_for_each_rcu(sk, node, &head->chain) {
if (sk->sk_hash != hash)
@@ -90,7 +89,6 @@ begin:
out:
sk = NULL;
found:
- rcu_read_unlock();
return sk;
}
EXPORT_SYMBOL(__inet6_lookup_established);
@@ -138,7 +136,6 @@ struct sock *inet6_lookup_listener(struct net *net,
unsigned int hash = inet_lhashfn(net, hnum);
struct inet_listen_hashbucket *ilb = &hashinfo->listening_hash[hash];
- rcu_read_lock();
begin:
result = NULL;
hiscore = 0;
@@ -187,7 +184,6 @@ found:
goto begin;
}
}
- rcu_read_unlock();
return result;
}
EXPORT_SYMBOL_GPL(inet6_lookup_listener);