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authorFelix Fietkau <nbd@nbd.name>2024-05-05 20:42:38 +0200
committerDavid S. Miller <davem@davemloft.net>2024-05-08 10:37:57 +0100
commit86b29d830ad69eecff25b22dc96c14c6573718e6 (patch)
tree57083ee248520565f1cef96770d96ce5a4a50846 /net
parent6963c508fd7ab66ae0b7ae3db9a62ca6267f1ae8 (diff)
net: bridge: fix corrupted ethernet header on multicast-to-unicast
The change from skb_copy to pskb_copy unfortunately changed the data copying to omit the ethernet header, since it was pulled before reaching this point. Fix this by calling __skb_push/pull around pskb_copy. Fixes: 59c878cbcdd8 ("net: bridge: fix multicast-to-unicast with fraglist GSO") Signed-off-by: Felix Fietkau <nbd@nbd.name> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_forward.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index d7c35f55bd69..d97064d460dc 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -258,6 +258,7 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
{
struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
const unsigned char *src = eth_hdr(skb)->h_source;
+ struct sk_buff *nskb;
if (!should_deliver(p, skb))
return;
@@ -266,12 +267,16 @@ static void maybe_deliver_addr(struct net_bridge_port *p, struct sk_buff *skb,
if (skb->dev == p->dev && ether_addr_equal(src, addr))
return;
- skb = pskb_copy(skb, GFP_ATOMIC);
- if (!skb) {
+ __skb_push(skb, ETH_HLEN);
+ nskb = pskb_copy(skb, GFP_ATOMIC);
+ __skb_pull(skb, ETH_HLEN);
+ if (!nskb) {
DEV_STATS_INC(dev, tx_dropped);
return;
}
+ skb = nskb;
+ __skb_pull(skb, ETH_HLEN);
if (!is_broadcast_ether_addr(addr))
memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);