net: add ETH_P_802_3_MIN

Add a new constant ETH_P_802_3_MIN, the minimum ethernet type for
an 802.3 frame. Frames with a lower value in the ethernet type field
are Ethernet II.

Also update all the users of this value that David Miller and
I could find to use the new constant.

Also correct a bug in util.c. The comparison with ETH_P_802_3_MIN
should be >= not >.

As suggested by Jesse Gross.

Compile tested only.

Cc: David Miller <davem@davemloft.net>
Cc: Jesse Gross <jesse@nicira.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Bart De Schuymer <bart.de.schuymer@pandora.be>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: linux-bluetooth@vger.kernel.org
Cc: netfilter-devel@vger.kernel.org
Cc: bridge@lists.linux-foundation.org
Cc: linux-wireless@...

drivers/firewire/net.c

@@ -547,7 +547,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net,
 			if (memcmp(eth->h_dest, net->dev_addr, net->addr_len))
 				skb->pkt_type = PACKET_OTHERHOST;
 		}
-		if (ntohs(eth->h_proto) >= 1536) {
+		if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN) {
 			protocol = eth->h_proto;
 		} else {
 			rawp = (u16 *)skb->data;

drivers/isdn/i4l/isdn_net.c

@@ -1385,7 +1385,7 @@ isdn_net_type_trans(struct sk_buff *skb, struct net_device *dev)
 		if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
 			skb->pkt_type = PACKET_OTHERHOST;
 	}
-	if (ntohs(eth->h_proto) >= 1536)
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 		return eth->h_proto;
 
 	rawp = skb->data;

drivers/media/dvb-core/dvb_net.c

@@ -185,7 +185,7 @@ static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 			skb->pkt_type=PACKET_MULTICAST;
 	}
 
-	if (ntohs(eth->h_proto) >= 1536)
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 		return eth->h_proto;
 
 	rawp = skb->data;
@@ -228,9 +228,9 @@ static int ule_test_sndu( struct dvb_net_priv *p )
 static int ule_bridged_sndu( struct dvb_net_priv *p )
 {
 	struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
-	if(ntohs(hdr->h_proto) < 1536) {
+	if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 		int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
-		/* A frame Type < 1536 for a bridged frame, introduces a LLC Length field. */
+		/* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 		if(framelen != ntohs(hdr->h_proto)) {
 			return -1;
 		}
@@ -320,7 +320,7 @@ static int handle_ule_extensions( struct dvb_net_priv *p )
 			(int) p->ule_sndu_type, l, total_ext_len);
 #endif
 
-	} while (p->ule_sndu_type < 1536);
+	} while (p->ule_sndu_type < ETH_P_802_3_MIN);
 
 	return total_ext_len;
 }
@@ -712,7 +712,7 @@ static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
 				}
 
 				/* Handle ULE Extension Headers. */
-				if (priv->ule_sndu_type < 1536) {
+				if (priv->ule_sndu_type < ETH_P_802_3_MIN) {
 					/* There is an extension header.  Handle it accordingly. */
 					int l = handle_ule_extensions(priv);
 					if (l < 0) {

drivers/net/ethernet/sun/niu.c

@@ -6618,7 +6618,7 @@ static u64 niu_compute_tx_flags(struct sk_buff *skb, struct ethhdr *ehdr,
 	       (len << TXHDR_LEN_SHIFT) |
 	       ((l3off / 2) << TXHDR_L3START_SHIFT) |
 	       (ihl << TXHDR_IHL_SHIFT) |
-	       ((eth_proto_inner < 1536) ? TXHDR_LLC : 0) |
+	       ((eth_proto_inner < ETH_P_802_3_MIN) ? TXHDR_LLC : 0) |
 	       ((eth_proto == ETH_P_8021Q) ? TXHDR_VLAN : 0) |
 	       (ipv6 ? TXHDR_IP_VER : 0) |
 	       csum_bits);

drivers/net/plip/plip.c

@@ -560,7 +560,7 @@ static __be16 plip_type_trans(struct sk_buff *skb, struct net_device *dev)
 	 *	so don't forget to remove it.
 	 */
 
-	if (ntohs(eth->h_proto) >= 1536)
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 		return eth->h_proto;
 
 	rawp = skb->data;

drivers/net/wireless/ray_cs.c

@@ -953,7 +953,7 @@ static int translate_frame(ray_dev_t *local, struct tx_msg __iomem *ptx,
 			   unsigned char *data, int len)
 {
 	__be16 proto = ((struct ethhdr *)data)->h_proto;
-	if (ntohs(proto) >= 1536) { /* DIX II ethernet frame */
+	if (ntohs(proto) >= ETH_P_802_3_MIN) { /* DIX II ethernet frame */
 		pr_debug("ray_cs translate_frame DIX II\n");
 		/* Copy LLC header to card buffer */
 		memcpy_toio(&ptx->var, eth2_llc, sizeof(eth2_llc));

include/linux/if_vlan.h

@@ -339,7 +339,7 @@ static inline void vlan_set_encap_proto(struct sk_buff *skb,
 	 */
 
 	proto = vhdr->h_vlan_encapsulated_proto;
-	if (ntohs(proto) >= 1536) {
+	if (ntohs(proto) >= ETH_P_802_3_MIN) {
 		skb->protocol = proto;
 		return;
 	}

include/uapi/linux/if_ether.h

@@ -94,6 +94,9 @@
 #define ETH_P_EDSA	0xDADA		/* Ethertype DSA [ NOT AN OFFICIALLY REGISTERED ID ] */
 #define ETH_P_AF_IUCV   0xFBFB		/* IBM af_iucv [ NOT AN OFFICIALLY REGISTERED ID ] */
 
+#define ETH_P_802_3_MIN	0x0600		/* If the value in the ethernet type is less than this value
+					 * then the frame is Ethernet II. Else it is 802.3 */
+
 /*
  *	Non DIX types. Won't clash for 1500 types.
  */

net/atm/lec.h

@@ -58,7 +58,7 @@ struct lane2_ops {
  *    field in h_type field. Data follows immediately after header.
  * 2. LLC Data frames whose total length, including LLC field and data,
  *    but not padding required to meet the minimum data frame length,
- *    is less than 1536(0x0600) MUST be encoded by placing that length
+ *    is less than ETH_P_802_3_MIN MUST be encoded by placing that length
  *    in the h_type field. The LLC field follows header immediately.
  * 3. LLC data frames longer than this maximum MUST be encoded by placing
  *    the value 0 in the h_type field.

net/bluetooth/bnep/netdev.c

@@ -136,7 +136,7 @@ static u16 bnep_net_eth_proto(struct sk_buff *skb)
 	struct ethhdr *eh = (void *) skb->data;
 	u16 proto = ntohs(eh->h_proto);
 
-	if (proto >= 1536)
+	if (proto >= ETH_P_802_3_MIN)
 		return proto;
 
 	if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))

net/bridge/netfilter/ebtables.c

@@ -138,7 +138,7 @@ ebt_basic_match(const struct ebt_entry *e, const struct sk_buff *skb,
 		ethproto = h->h_proto;
 
 	if (e->bitmask & EBT_802_3) {
-		if (FWINV2(ntohs(ethproto) >= 1536, EBT_IPROTO))
+		if (FWINV2(ntohs(ethproto) >= ETH_P_802_3_MIN, EBT_IPROTO))
 			return 1;
 	} else if (!(e->bitmask & EBT_NOPROTO) &&
 	   FWINV2(e->ethproto != ethproto, EBT_IPROTO))

net/ethernet/eth.c

@@ -195,7 +195,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
 	if (netdev_uses_trailer_tags(dev))
 		return htons(ETH_P_TRAILER);
 
-	if (ntohs(eth->h_proto) >= 1536)
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 		return eth->h_proto;
 
 	/*

net/mac80211/tx.c

@@ -2085,7 +2085,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
 		encaps_data = bridge_tunnel_header;
 		encaps_len = sizeof(bridge_tunnel_header);
 		skip_header_bytes -= 2;
-	} else if (ethertype >= 0x600) {
+	} else if (ethertype >= ETH_P_802_3_MIN) {
 		encaps_data = rfc1042_header;
 		encaps_len = sizeof(rfc1042_header);
 		skip_header_bytes -= 2;

net/openvswitch/datapath.c

@@ -681,7 +681,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 	/* Normally, setting the skb 'protocol' field would be handled by a
 	 * call to eth_type_trans(), but it assumes there's a sending
 	 * device, which we may not have. */
-	if (ntohs(eth->h_proto) >= 1536)
+	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 		packet->protocol = eth->h_proto;
 	else
 		packet->protocol = htons(ETH_P_802_2);

net/openvswitch/flow.c

@@ -466,7 +466,7 @@ static __be16 parse_ethertype(struct sk_buff *skb)
 	proto = *(__be16 *) skb->data;
 	__skb_pull(skb, sizeof(__be16));
 
-	if (ntohs(proto) >= 1536)
+	if (ntohs(proto) >= ETH_P_802_3_MIN)
 		return proto;
 
 	if (skb->len < sizeof(struct llc_snap_hdr))
@@ -483,7 +483,7 @@ static __be16 parse_ethertype(struct sk_buff *skb)
 
 	__skb_pull(skb, sizeof(struct llc_snap_hdr));
 
-	if (ntohs(llc->ethertype) >= 1536)
+	if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
 		return llc->ethertype;
 
 	return htons(ETH_P_802_2);
@@ -1038,7 +1038,7 @@ int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
 
 	if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
 		swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
-		if (ntohs(swkey->eth.type) < 1536)
+		if (ntohs(swkey->eth.type) < ETH_P_802_3_MIN)
 			return -EINVAL;
 		attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
 	} else {

net/wireless/util.c

@@ -511,7 +511,7 @@ int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 		encaps_data = bridge_tunnel_header;
 		encaps_len = sizeof(bridge_tunnel_header);
 		skip_header_bytes -= 2;
-	} else if (ethertype > 0x600) {
+	} else if (ethertype >= ETH_P_802_3_MIN) {
 		encaps_data = rfc1042_header;
 		encaps_len = sizeof(rfc1042_header);
 		skip_header_bytes -= 2;