From 479fb037277d2fec63df3a8ae6492206c3e771a8 Mon Sep 17 00:00:00 2001 From: Xie He Date: Tue, 25 Aug 2020 20:03:53 -0700 Subject: [PATCH] drivers/net/wan/lapbether: Set network_header before transmitting [ Upstream commit 91244d108441013b7367b3b4dcc6869998676473 ] Set the skb's network_header before it is passed to the underlying Ethernet device for transmission. This patch fixes the following issue: When we use this driver with AF_PACKET sockets, there would be error messages of: protocol 0805 is buggy, dev (Ethernet interface name) printed in the system "dmesg" log. This is because skbs passed down to the Ethernet device for transmission don't have their network_header properly set, and the dev_queue_xmit_nit function in net/core/dev.c complains about this. Reason of setting the network_header to this place (at the end of the Ethernet header, and at the beginning of the Ethernet payload): Because when this driver receives an skb from the Ethernet device, the network_header is also set at this place. Cc: Martin Schiller Signed-off-by: Xie He Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/wan/lapbether.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c index 6b2553e893ac..15177a54b17d 100644 --- a/drivers/net/wan/lapbether.c +++ b/drivers/net/wan/lapbether.c @@ -213,6 +213,8 @@ static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb) skb->dev = dev = lapbeth->ethdev; + skb_reset_network_header(skb); + dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0); dev_queue_xmit(skb); -- 2.20.1