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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 <[email protected]>
Signed-off-by: WANG Cong <[email protected]>
Cc: Neil Horman <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Amerigo Wang 2010-05-05 00:27:06 +00:00 • committed by David S. Miller
commit e3826f1e94
8 changed files with 73 additions and 2 deletions
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2
net/sctp/socket.c
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@ -5433,6 +5433,8 @@ static long sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
rover++;
if ((rover < low) || (rover > high))
rover = low;
if (inet_is_reserved_local_port(rover))
continue;
index = sctp_phashfn(rover);
head = &sctp_port_hashtable[index];
sctp_spin_lock(&head->lock);