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authorAmerigo Wang <amwang@redhat.com>2010-05-05 04:27:06 +0400
committerDavid S. Miller <davem@davemloft.net>2010-05-16 10:28:40 +0400
commite3826f1e946e7d2354943232f1457be1455a29e2 (patch)
treea34055c7de762410b6a10c21ab5e1999fb38803b /net/ipv4/inet_hashtables.c
parent9f977fb7ae9ddf565b4800854212fb9a1ed6c2ea (diff)
downloadlinux-e3826f1e946e7d2354943232f1457be1455a29e2.tar.xz
net: reserve ports for applications using fixed port numbers
(Dropped the infiniband part, because Tetsuo modified the related code, I will send a separate patch for it once this is accepted.) This patch introduces /proc/sys/net/ipv4/ip_local_reserved_ports which allows users to reserve ports for third-party applications. The reserved ports will not be used by automatic port assignments (e.g. when calling connect() or bind() with port number 0). Explicit port allocation behavior is unchanged. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: WANG Cong <amwang@redhat.com> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/inet_hashtables.c')
-rw-r--r--net/ipv4/inet_hashtables.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 2b79377b468d..d3e160a88219 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -456,6 +456,8 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
local_bh_disable();
for (i = 1; i <= remaining; i++) {
port = low + (i + offset) % remaining;
+ if (inet_is_reserved_local_port(port))
+ continue;
head = &hinfo->bhash[inet_bhashfn(net, port,
hinfo->bhash_size)];
spin_lock(&head->lock);