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net: reserve ports for applications using fixed port numbers

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(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>
This commit is contained in:
Amerigo Wang
2010-05-05 00:27:06 +00:00
committed by David S. Miller
parent 9f977fb7ae
commit e3826f1e94
8 changed files with 73 additions and 2 deletions
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3
net/ipv4/udp.c
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@ -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);