Commit 58ef67c3 authored by Tony Cheneau's avatar Tony Cheneau Committed by David S. Miller
Browse files

6lowpan: use short IEEE 802.15.4 addresses for broadcast destination 



The IEEE 802.15.4 standard uses the 0xFFFF short address (2 bytes) for message
broadcasting.

Signed-off-by: default avatarTony Cheneau <tony.cheneau@amnesiak.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cf692061

net/ieee802154/6lowpan.c

+15 −8
Original line number Diff line number Diff line
@@ -572,21 +572,28 @@ static int lowpan_header_create(struct sk_buff *skb, 
	 * this isn't implemented in mainline yet, so currently we assign 0xff

	 */

	{

		mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;



		/* prepare wpan address data */

		sa.addr_type = IEEE802154_ADDR_LONG;

		sa.pan_id = 0xff;

		memcpy(&(sa.hwaddr), saddr, 8);



		da.addr_type = IEEE802154_ADDR_LONG;

		da.pan_id = 0xff;



		/*

		 * if the destination address is the broadcast address, use the

		 * corresponding short address

		 */

		if (lowpan_is_addr_broadcast(daddr)) {

			da.addr_type = IEEE802154_ADDR_SHORT;

			da.short_addr = IEEE802154_ADDR_BROADCAST;

		} else {

			da.addr_type = IEEE802154_ADDR_LONG;

			memcpy(&(da.hwaddr), daddr, 8);

		memcpy(&(sa.hwaddr), saddr, 8);



		mac_cb(skb)->flags = IEEE802154_FC_TYPE_DATA;



		/* request acknowledgment when possible */

		if (!lowpan_is_addr_broadcast(daddr))

			/* request acknowledgment */

			mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;

		}



		return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,

				type, (void *)&da, (void *)&sa, skb->len);