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devip: make Rproxy flag explicit

--- a/sys/man/3/ip

+++ b/sys/man/3/ip

@@ -420,6 +420,9 @@

 .B p

 point-to-point route

 .TP

+.B y

+proxy ARP for this route

+.TP

 .B t

 network source address translation

 .PD

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

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

@@ -312,7 +312,7 @@

 		if((p->type & Rifc) == 0)

 			copygate(p, new);

 		else if(new->type & Rifc){

-			p->type = (p->type & ~Rtrans) | (new->type & Rtrans);

+			p->type = (p->type & ~(Rproxy|Rtrans)) | (new->type & (Rproxy|Rtrans));

 			p->ref++;

 		}

 		freeroute(new);

@@ -877,6 +877,9 @@

 	case 'p':

 		if(((type ^= Rptpt) & Rptpt) != Rptpt) return -1;

 		break;

+	case 'y':

+		if(((type ^= Rproxy) & Rproxy) != Rproxy) return -1;

+		break;

 	case 't':

 		if(((type ^= Rtrans) & Rtrans) != Rtrans) return -1;

 		break;

@@ -905,6 +908,9 @@

 	if(type & Rptpt)

 		*p++ = 'p';

+

+	if(type & Rproxy)

+		*p++ = 'y';

 	if(type & Rtrans)

 		*p++ = 't';