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ipv4: Implement IP_TRANSPARENT socket option

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This patch introduces the IP_TRANSPARENT socket option: enabling that
will make the IPv4 routing omit the non-local source address check on
output. Setting IP_TRANSPARENT requires NET_ADMIN capability.

Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
KOVACS Krisztian
2008-10-01 07:30:02 -07:00
committed by David S. Miller
parent a210d01ae3
commit f5715aea45
5 changed files with 20 additions and 3 deletions
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15
net/ipv4/ip_sockglue.c
View File

@@ -419,7 +419,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
(1<<IP_TTL) | (1<<IP_HDRINCL) |
(1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
(1<<IP_PASSSEC))) ||
(1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
optname == IP_MULTICAST_TTL ||
optname == IP_MULTICAST_LOOP) {
if (optlen >= sizeof(int)) {
@@ -878,6 +878,16 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = xfrm_user_policy(sk, optname, optval, optlen);
break;
case IP_TRANSPARENT:
if (!capable(CAP_NET_ADMIN)) {
err = -EPERM;
break;
}
if (optlen < 1)
goto e_inval;
inet->transparent = !!val;
break;
default:
err = -ENOPROTOOPT;
break;
@@ -1130,6 +1140,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
case IP_FREEBIND:
val = inet->freebind;
break;
case IP_TRANSPARENT:
val = inet->transparent;
break;
default:
release_sock(sk);
return -ENOPROTOOPT;