code: 9ferno

Download patch

ref: 2a89e34cd0b8015dc6b8f679e5cc17511a4743ca
parent: 52d0ccf0d31f471093d99a10ca7c17f4487d6906
author: 9ferno <gophone2015@gmail.com>
date: Thu Aug 26 10:00:25 EDT 2021 

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)