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[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>
This commit is contained in:
Patrick McHardy 2008-04-14 11:15:46 +02:00
parent 937e0dfd87
commit 5abd363f73
1 changed files with 10 additions and 5 deletions
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15
net/ipv4/netfilter/nf_nat_proto_common.c
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@ -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;
}