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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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6
net/ipv4/inet_connection_sock.c
View File

@@ -37,6 +37,9 @@ struct local_ports sysctl_local_ports __read_mostly = {
.range = { 32768, 61000 },
};
unsigned long *sysctl_local_reserved_ports;
EXPORT_SYMBOL(sysctl_local_reserved_ports);
void inet_get_local_port_range(int *low, int *high)
{
unsigned seq;
@@ -108,6 +111,8 @@ again:
smallest_size = -1;
do {
if (inet_is_reserved_local_port(rover))
goto next_nolock;
head = &hashinfo->bhash[inet_bhashfn(net, rover,
hashinfo->bhash_size)];
spin_lock(&head->lock);
@@ -130,6 +135,7 @@ again:
break;
next:
spin_unlock(&head->lock);
next_nolock:
if (++rover > high)
rover = low;
} while (--remaining > 0);