[ethernet] Expose eth_broadcast as a global constant

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/ethernet.h

 		 ( ! is_zero_ether_addr ( addr ) ) );
 }
 
+extern uint8_t eth_broadcast[];
 extern int eth_push ( struct net_device *netdev, struct io_buffer *iobuf,
 		      const void *ll_dest, const void *ll_source,
 		      uint16_t net_proto );

src/net/80211/net80211.c

 
 /* ---------- 802.11 link-layer protocol ---------- */
 
-/** 802.11 broadcast MAC address */
-static u8 net80211_ll_broadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-
 /**
  * Determine whether a transmission rate uses ERP/OFDM
  *
 		return NULL;
 
 	netdev->ll_protocol = &net80211_ll_protocol;
-	netdev->ll_broadcast = net80211_ll_broadcast;
+	netdev->ll_broadcast = eth_broadcast;
 	netdev->max_pkt_len = IEEE80211_MAX_DATA_LEN;
 	netdev_init ( netdev, &net80211_netdev_ops );
 
 
 			ctx->probe = iob;
 			rc = net80211_tx_mgmt ( dev, IEEE80211_STYPE_PROBE_REQ,
-						net80211_ll_broadcast,
+						eth_broadcast,
 						iob_disown ( siob ) );
 			if ( rc ) {
 				DBGC ( dev, "802.11 %p send probe failed: "

src/net/ethernet.c

  */
 
 /** Ethernet broadcast MAC address */
-static uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+uint8_t eth_broadcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
 /**
  * Add Ethernet link-layer header