tipc: Hide media-specific addressing details from generic bearer code

Reworks TIPC's media address data structure and associated processing
routines to transfer all media-specific details of address conversion
to the associated TIPC media adaptation code. TIPC's generic bearer code
now only needs to know which media type an address is associated with
and whether or not it is a broadcast address, and totally ignores the
"value" field that contains the actual media-specific addressing info.

These changes eliminate the need for a number of endianness conversion
operations and will make it easier for TIPC to support new media types
in the future.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 13 insertions, 9 deletions

diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index ebba0fc..3b75c0d 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -54,18 +54,24 @@ struct eth_bearer {
 	struct packet_type tipc_packet_type;
 };
 
+static struct media eth_media_info;
 static struct eth_bearer eth_bearers[MAX_ETH_BEARERS];
 static int eth_started;
 static struct notifier_block notifier;
 
 /**
  * eth_media_addr_set - initialize Ethernet media address structure
+ *
+ * Media-dependent "value" field stores MAC address in first 6 bytes
+ * and zeroes out the remaining bytes.
  */
 
 static void eth_media_addr_set(struct tipc_media_addr *a, char *mac)
 {
-	a->type = htonl(TIPC_MEDIA_TYPE_ETH);
-	memcpy(&a->dev_addr.eth_addr, mac, ETH_ALEN);
+	memcpy(a->value, mac, ETH_ALEN);
+	memset(a->value + ETH_ALEN, 0, sizeof(a->value) - ETH_ALEN);
+	a->media_id = TIPC_MEDIA_TYPE_ETH;
+	a->broadcast = !memcmp(mac, eth_media_info.bcast_addr.value, ETH_ALEN);
 }
 
 /**
@@ -94,7 +100,7 @@ static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
 
 	skb_reset_network_header(clone);
 	clone->dev = dev;
-	dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
+	dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
 			dev->dev_addr, clone->len);
 	dev_queue_xmit(clone);
 	return 0;
@@ -256,12 +262,10 @@ static int recv_notification(struct notifier_block *nb, unsigned long evt,
 
 static int eth_addr2str(struct tipc_media_addr *a, char *str_buf, int str_size)
 {
-	unchar *addr = (unchar *)&a->dev_addr;
-
 	if (str_size < 18)	/* 18 = strlen("aa:bb:cc:dd:ee:ff\0") */
 		return 1;
 
-	sprintf(str_buf, "%pM", addr);
+	sprintf(str_buf, "%pM", a->value);
 	return 0;
 }
 
@@ -293,7 +297,7 @@ static int eth_addr2msg(struct tipc_media_addr *a, char *msg_area)
 {
 	memset(msg_area, 0, TIPC_MEDIA_ADDR_SIZE);
 	msg_area[TIPC_MEDIA_TYPE_OFFSET] = TIPC_MEDIA_TYPE_ETH;
-	memcpy(msg_area + ETH_ADDR_OFFSET, a->dev_addr.eth_addr, ETH_ALEN);
+	memcpy(msg_area + ETH_ADDR_OFFSET, a->value, ETH_ALEN);
 	return 0;
 }
 
@@ -322,8 +326,8 @@ static struct media eth_media_info = {
 	.str2addr	= eth_str2addr,
 	.addr2msg	= eth_addr2msg,
 	.msg2addr	= eth_msg2addr,
-	.bcast_addr	= { htonl(TIPC_MEDIA_TYPE_ETH),
-			    { {0xff, 0xff, 0xff, 0xff, 0xff, 0xff} } },
+	.bcast_addr	= { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff },
+			    TIPC_MEDIA_TYPE_ETH, 1 },
 	.priority	= TIPC_DEF_LINK_PRI,
 	.tolerance	= TIPC_DEF_LINK_TOL,
 	.window		= TIPC_DEF_LINK_WIN,