diff options
| author | Eric Leblond <eric@inl.fr> | 2007-02-07 15:10:09 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-02-08 12:39:17 -0800 |
| commit | 41f4689a7c8cd76b77864461b3c58fde8f322b2c (patch) | |
| tree | 29be7597bc02158ca41261f365ebcbd8047dd56f /net/ipv4/netfilter/ip_nat_core.c | |
| parent | cdd289a2f833b93e65b9a09a02c37f47a58140a8 (diff) | |
[NETFILTER]: NAT: optional source port randomization support
This patch adds support to NAT to randomize source ports.
Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/netfilter/ip_nat_core.c')
| -rw-r--r-- | net/ipv4/netfilter/ip_nat_core.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/net/ipv4/netfilter/ip_nat_core.c b/net/ipv4/netfilter/ip_nat_core.c index 9d1a5175dcd..5e08c2bf887 100644 --- a/net/ipv4/netfilter/ip_nat_core.c +++ b/net/ipv4/netfilter/ip_nat_core.c @@ -246,8 +246,9 @@ get_unique_tuple(struct ip_conntrack_tuple *tuple, if (maniptype == IP_NAT_MANIP_SRC) { if (find_appropriate_src(orig_tuple, tuple, range)) { DEBUGP("get_unique_tuple: Found current src map\n"); - if (!ip_nat_used_tuple(tuple, conntrack)) - return; + if (!(range->flags & IP_NAT_RANGE_PROTO_RANDOM)) + if (!ip_nat_used_tuple(tuple, conntrack)) + return; } } @@ -261,6 +262,13 @@ get_unique_tuple(struct ip_conntrack_tuple *tuple, proto = ip_nat_proto_find_get(orig_tuple->dst.protonum); + /* Change protocol info to have some randomization */ + if (range->flags & IP_NAT_RANGE_PROTO_RANDOM) { + proto->unique_tuple(tuple, range, maniptype, conntrack); + ip_nat_proto_put(proto); + return; + } + /* Only bother mapping if it's not already in range and unique */ if ((!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED) || proto->in_range(tuple, maniptype, &range->min, &range->max)) |