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authorPatrick McHardy <kaber@trash.net>2008-04-14 11:15:46 +0200
committerPatrick McHardy <kaber@trash.net>2008-04-14 11:15:46 +0200
commit5abd363f738dcd048ee790fb9b84d0768a8a407f (patch)
treed6b7351ee220614e4aeed8130452da579bd4a530 /net/ipv4
parent937e0dfd87a8b7946a17161664500fba93eb13fd (diff)
[NETFILTER]: nf_nat: fix random mode not to overwrite port rover
The port rover should not get overwritten when using random mode, otherwise other rules will also use more or less random ports. Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/nf_nat_proto_common.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/net/ipv4/netfilter/nf_nat_proto_common.c b/net/ipv4/netfilter/nf_nat_proto_common.c
index a124213fb9d..871ab0eb325 100644
--- a/net/ipv4/netfilter/nf_nat_proto_common.c
+++ b/net/ipv4/netfilter/nf_nat_proto_common.c
@@ -42,6 +42,7 @@ int nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
{
unsigned int range_size, min, i;
__be16 *portptr;
+ u_int16_t off;
if (maniptype == IP_NAT_MANIP_SRC)
portptr = &tuple->src.u.all;
@@ -72,13 +73,17 @@ int nf_nat_proto_unique_tuple(struct nf_conntrack_tuple *tuple,
range_size = ntohs(range->max.all) - min + 1;
}
+ off = *rover;
if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
- *rover = net_random();
+ off = net_random();
- for (i = 0; i < range_size; i++, (*rover)++) {
- *portptr = htons(min + *rover % range_size);
- if (!nf_nat_used_tuple(tuple, ct))
- return 1;
+ for (i = 0; i < range_size; i++, off++) {
+ *portptr = htons(min + off % range_size);
+ if (nf_nat_used_tuple(tuple, ct))
+ continue;
+ if (!(range->flags & IP_NAT_RANGE_PROTO_RANDOM))
+ *rover = off;
+ return 1;
}
return 0;
}