diff options
| -rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_common.c | 15 |
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 a124213fb9da..871ab0eb325d 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; } |