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ndb/cs: icmp only supports version 4 addresses, icmpv6 only version 6 addresses

--- a/sys/src/cmd/ndb/cs.c

+++ b/sys/src/cmd/ndb/cs.c

@@ -1525,8 +1525,12 @@

 		snprint(reply, sizeof(reply), "%s/%s/clone %s%s",

 			mntpt, np->net, ts, x);

 	else {

-		/* il only supports ipv4 addresses */

-		if(strcmp(np->net, "il") == 0 && !isv4str(t->val))

+		/* il and icmp only supports ipv4 addresses */

+		if((strcmp(np->net, "il") == 0 || strcmp(np->net, "icmp") == 0) && !isv4str(t->val))

+			return nil;

+

+		/* icmpv6 does not support ipv4 addresses */

+		if(strcmp(np->net, "icmpv6") == 0 && isv4str(t->val))

 			return nil;

 		snprint(reply, sizeof(reply), "%s/%s/clone %s!%s%s%s",

-- 

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