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devip: add gratious arp ctl message to /net/arp

writing "garp <ip>" will send a gratious arp for
the provided ip address (if it can be found on
any interface).

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

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

@@ -501,9 +501,9 @@

 		}

 		runlock(ifc);

 	} else if(strcmp(f[0], "del") == 0){

-		if (n != 2)

+		if(n != 2)

 			error(Ebadarg);

-		if (parseip(ip, f[1]) == -1)

+		if(parseip(ip, f[1]) == -1)

 			error(Ebadip);

 		wlock(arp);

 		for(a = arp->hash[hashipa(ip)]; a != nil; a = x){

@@ -512,6 +512,26 @@

 				cleanarpent(arp, a);

 		}

 		wunlock(arp);

+	} else if(strcmp(f[0], "garp") == 0){

+		Iplifc *lifc;

+

+		if(n != 2)

+			error(Ebadarg);

+		if(parseip(ip, f[1]) == -1)

+			error(Ebadip);

+

+		if((ifc = findipifc(fs, ip, ip, Runi)) == nil)

+			error("no interface");

+

+		rlock(ifc);

+		if(waserror()){

+			runlock(ifc);

+			nexterror();

+		}

+		if(ifc->m != nil && ifc->m->areg != nil && (lifc = iplocalonifc(ifc, ip)) != nil)

+			(*ifc->m->areg)(fs, ifc, lifc, ip);

+		runlock(ifc);

+		poperror();

 	} else

 		error(Ebadarp);