net: reserve ports for applications using fixed port numbers

[net-next-2.6.git] / net / ipv4 / udp.c

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 4560b291180ba433e6df630b0b8a6599dbbb165f..9de6a698f91d6ed861d8dd42c803a49222db7105 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -233,7 +233,8 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
                         */
                        do {
                                if (low <= snum && snum <= high &&
-                                   !test_bit(snum >> udptable->log, bitmap))
+                                   !test_bit(snum >> udptable->log, bitmap) &&
+                                   !inet_is_reserved_local_port(snum))
                                        goto found;
                                snum += rand;
                        } while (snum != first);
@@ -1536,6 +1537,9 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 
        uh   = udp_hdr(skb);
        ulen = ntohs(uh->len);
+       saddr = ip_hdr(skb)->saddr;
+       daddr = ip_hdr(skb)->daddr;
+
        if (ulen > skb->len)
                goto short_packet;
 
@@ -1549,9 +1553,6 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
        if (udp4_csum_init(skb, uh, proto))
                goto csum_error;
 
-       saddr = ip_hdr(skb)->saddr;
-       daddr = ip_hdr(skb)->daddr;
-
        if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
                return __udp4_lib_mcast_deliver(net, skb, uh,
                                saddr, daddr, udptable);