diff options
| author |   Amerigo Wang <amwang@redhat.com> | 2010-05-05 00:27:06 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2010-05-15 23:28:40 -0700 |
| commit | e3826f1e946e7d2354943232f1457be1455a29e2 (patch) | |
| tree | a34055c7de762410b6a10c21ab5e1999fb38803b /net/ipv4/udp.c | |
| parent | sysctl: add proc_do_large_bitmap (diff) | |
| download | linux-dev-e3826f1e946e7d2354943232f1457be1455a29e2.tar.xz linux-dev-e3826f1e946e7d2354943232f1457be1455a29e2.zip | |
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/udp.c')
| -rw-r--r-- | net/ipv4/udp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index f3e00c5cd1ed..9de6a698f91d 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -233,7 +233,8 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum, */ do { if (low <= snum && snum <= high && - !test_bit(snum >> udptable->log, bitmap)) + !test_bit(snum >> udptable->log, bitmap) && + !inet_is_reserved_local_port(snum)) goto found; snum += rand; } while (snum != first); |