code: 9ferno

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fixed nat udp wrong length bug

--- a/os/ip/nat.c

+++ b/os/ip/nat.c

@@ -128,8 +128,8 @@

 	if(ip4cmp(h->src, laddr) != 0){

 		if((np=parseproto(h->proto)) != nil){

 			/* Protocol layer */

-			sport = (b->rp)+sizeof(Ip4hdr)+np->sport;

-			cksum = (b->rp)+sizeof(Ip4hdr)+np->cksum;

+			sport = (b->rp)+IP4HDR+np->sport;

+			cksum = (b->rp)+IP4HDR+np->cksum;

 			if((n = natlport(p, h, sport)) == nil)

 				return -1;

 			memmove(sport, n->lport, 2);

@@ -171,10 +171,10 @@

 		return;

 	if((np=parseproto(h->proto)) != nil){

-		lport = (b->rp)+sizeof(Ip4hdr)+np->dport;

+		lport = (b->rp)+IP4HDR+np->dport;

 		if((n=natexistin(h->proto, lport)) != nil){

 			/* Protocol layer */

-			cksum = (b->rp)+sizeof(Ip4hdr)+np->cksum;

+			cksum = (b->rp)+IP4HDR+np->cksum;

 			checksumadjust(cksum, lport, 2, n->sport, 2);

 			memmove(lport, n->sport, 2);

 			if(np->proto != 1)