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devip: allow (NAT) hole punching for ICMP and UDP

When establishing an translation for ICMP or UDP,
allow the reply to be matched from ANY source ip/port.

--- a/sys/src/9/ip/ipaux.c

+++ b/sys/src/9/ip/ipaux.c

@@ -520,7 +520,8 @@

 	q->backward.trans = 2;

 	q->backward.lport = lport;

 	ipmove(q->backward.laddr, ia);

-	if(p->ipproto == 1 || ipismulticast(da)){

+	if(p->ipproto == 1 || p->ipproto == 17){

+		/* ICMP and UDP allow reply from anyone (for hole punching) */

 		q->backward.rport = 0;

 		ipmove(q->backward.raddr, IPnoaddr);

 	} else {

-- 

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