UDP short packet patch for ipv4

This patch changes printk to add helpful information...i.e. who to firewall etc. It is against 2.4.18-rc1. IPV6 needs one too but in my opinion, a similar NIPQUAD macro needs built and the IPV6 core in general needs a tidying up to use the new macro.

@@ -928,7 +928,14 @@
       return(0);
 

short_packet:
- NETDEBUG(if (net_ratelimit()) printk(KERN_DEBUG "UDP: short packet: %d/%d\n", ulen, len));
+ NETDEBUG(if (net_ratelimit())
+ printk(KERN_DEBUG "UDP: short packet: %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",

+                       NIPQUAD(saddr),
+                       ntohs(uh->source),
+                       ulen,
+                       len,
+                       NIPQUAD(daddr),
+                       ntohs(uh->dest)));
no_header:
       UDP_INC_STATS_BH(UdpInErrors);
       kfree_skb(skb);