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authorPavel Emelyanov <xemul@openvz.org>2008-04-14 02:42:27 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-14 02:42:27 -0700
commit7477fd2e6b676fcd15861c2a96a7172f71afe0a5 (patch)
tree82801f361c0e196a8b67481a5fd9435a206ba76f
parent13f51d82acb003918d71ce4639ae77fceaa58cad (diff)
downloadop-kernel-dev-7477fd2e6b676fcd15861c2a96a7172f71afe0a5.zip
op-kernel-dev-7477fd2e6b676fcd15861c2a96a7172f71afe0a5.tar.gz
[SOCK]: Add some notes about per-bind-bucket sock lookup.
I was asked about "why don't we perform a sk_net filtering in bind_conflict calls, like we do in other sock lookup places" for a couple of times. Can we please add a comment about why we do not need one? Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/inet_connection_sock.c7
-rw-r--r--net/ipv6/inet6_connection_sock.c4
2 files changed, 11 insertions, 0 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 8d70cfb..828ea21 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -55,6 +55,13 @@ int inet_csk_bind_conflict(const struct sock *sk,
struct hlist_node *node;
int reuse = sk->sk_reuse;
+ /*
+ * Unlike other sk lookup places we do not check
+ * for sk_net here, since _all_ the socks listed
+ * in tb->owners list belong to the same net - the
+ * one this bucket belongs to.
+ */
+
sk_for_each_bound(sk2, node, &tb->owners) {
if (sk != sk2 &&
!inet_v6_ipv6only(sk2) &&
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 78de42a..87801cc 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -33,6 +33,10 @@ int inet6_csk_bind_conflict(const struct sock *sk,
const struct hlist_node *node;
/* We must walk the whole port owner list in this case. -DaveM */
+ /*
+ * See comment in inet_csk_bind_conflict about sock lookup
+ * vs net namespaces issues.
+ */
sk_for_each_bound(sk2, node, &tb->owners) {
if (sk != sk2 &&
(!sk->sk_bound_dev_if ||
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