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icmp: only forward EchoRequest, Timestamp(request), InfoRequest and AddrMaskRequest

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

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

@@ -564,6 +564,17 @@

 	Translation *q;

 	p = (Icmp*)(bp->rp);

+	switch(p->type){

+	case EchoRequest:

+	case Timestamp:

+	case InfoRequest:

+	case AddrMaskRequest:

+		break;

+	default:

+		/* no icmpid, can't translate back */

+		freeblist(bp);

+		return nil;

+	}

 	v4tov6(sa, p->src);

 	v4tov6(da, p->dst);

 	id = nhgets(p->icmpid);