Phonet: do not reply to indication reset packets

This fixes a potential error packet loop.

Signed-off-by: Remi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/phonet.h

@@ -72,6 +72,7 @@ struct phonetmsg {
 	} pn_msg_u;
 };
 #define PN_COMMON_MESSAGE	0xF0
+#define PN_COMMGR		0x10
 #define PN_PREFIX		0xE0 /* resource for extended messages */
 #define pn_submsg_id		pn_msg_u.base.pn_submsg_id
 #define pn_e_submsg_id		pn_msg_u.ext.pn_e_submsg_id

net/phonet/af_phonet.c

@@ -261,6 +261,8 @@ static inline int can_respond(struct sk_buff *skb)
 		return 0; /* we are not the destination */
 	if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5))
 		return 0;
+	if (ph->pn_res == PN_COMMGR) /* indications */
+		return 0;
 
 	ph = pn_hdr(skb); /* re-acquires the pointer */
 	pm = pn_msg(skb);
@@ -309,7 +311,8 @@ static int send_reset_indications(struct sk_buff *rskb)
 
 	return pn_raw_send(data, sizeof(data), rskb->dev,
 				pn_object(oph->pn_sdev, 0x00),
-				pn_object(oph->pn_rdev, oph->pn_robj), 0x10);
+				pn_object(oph->pn_rdev, oph->pn_robj),
+				PN_COMMGR);
 }