drivers: net: ppp: Set point-to-point interface flag

Set the point-to-point flag because PPP is a point-to-point protocol. This
flag enables specific IPv6 neighbor discovery handling, to select the
correct sending interface. Without it set, a different interface might be
selected based on the destination address.

Signed-off-by: Marc Lasch <[email protected]>

Author: mlasch

drivers/net/ppp.c

@@ -1031,6 +1031,12 @@ static void ppp_iface_init(struct net_if *iface)
 
 	memset(ppp->buf, 0, sizeof(ppp->buf));
 
+	/*
+	 * Set the point-to-point interface flag. This is needed at least for IPv6 neighbor
+	 * discovery to handle packets correctly.
+	 */
+	net_if_flag_set(iface, NET_IF_POINTOPOINT);
+
 #if defined(CONFIG_PPP_NET_IF_NO_AUTO_START)
 	/*
 	 * If interface autostart is disabled from Kconfig, then do not start the