This is a note to let you know that I've just added the patch titled
ethernet: Add helper for assigning packet type when dest address does not match device address
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ethernet-add-helper-for-assigning-packet-type-when-d.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5ec0913220c78c2da6448f8932935710168c25c5
Author: Rahul Rameshbabu <rrameshbabu@xxxxxxxxxx>
Date: Tue Apr 23 11:13:03 2024 -0700
ethernet: Add helper for assigning packet type when dest address does not match device address
[ Upstream commit 6e159fd653d7ebf6290358e0330a0cb8a75cf73b ]
Enable reuse of logic in eth_type_trans for determining packet type.
Suggested-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Rahul Rameshbabu <rrameshbabu@xxxxxxxxxx>
Reviewed-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240423181319.115860-3-rrameshbabu@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/etherdevice.h b/include/linux/etherdevice.h
index fef4bb77f7590..267b3cbc7ae13 100644
--- a/include/linux/etherdevice.h
+++ b/include/linux/etherdevice.h
@@ -543,6 +543,31 @@ static inline void eth_hw_addr_gen(struct net_device *dev, const u8 *base_addr,
eth_hw_addr_set(dev, addr);
}
+/**
+ * eth_skb_pkt_type - Assign packet type if destination address does not match
+ * @skb: Assigned a packet type if address does not match @dev address
+ * @dev: Network device used to compare packet address against
+ *
+ * If the destination MAC address of the packet does not match the network
+ * device address, assign an appropriate packet type.
+ */
+static inline void eth_skb_pkt_type(struct sk_buff *skb,
+ const struct net_device *dev)
+{
+ const struct ethhdr *eth = eth_hdr(skb);
+
+ if (unlikely(!ether_addr_equal_64bits(eth->h_dest, dev->dev_addr))) {
+ if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
+ if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
+ skb->pkt_type = PACKET_BROADCAST;
+ else
+ skb->pkt_type = PACKET_MULTICAST;
+ } else {
+ skb->pkt_type = PACKET_OTHERHOST;
+ }
+ }
+}
+
/**
* eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame
* @skb: Buffer to pad
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 88a074dd983e6..31be0b426e839 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -165,17 +165,7 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
eth = (struct ethhdr *)skb->data;
skb_pull_inline(skb, ETH_HLEN);
- if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
- dev->dev_addr))) {
- if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
- if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
- skb->pkt_type = PACKET_BROADCAST;
- else
- skb->pkt_type = PACKET_MULTICAST;
- } else {
- skb->pkt_type = PACKET_OTHERHOST;
- }
- }
+ eth_skb_pkt_type(skb, dev);
/*
* Some variants of DSA tagging don't have an ethertype field
