From: Martin Schiller ms@dev.tdt.de
[ Upstream commit 953c4a08dfc9ffe763a8340ac10f459d6c6cc4eb ]
o call skb_reset_network_header() before hdlc->xmit() o change skb proto to HDLC (0x0019) before hdlc->xmit() o call dev_queue_xmit_nit() before hdlc->xmit()
This changes make it possible to trace (tcpdump) outgoing layer2 (ETH_P_HDLC) packets
Additionally call skb_reset_network_header() after each skb_push() / skb_pull().
Signed-off-by: Martin Schiller ms@dev.tdt.de Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wan/hdlc_x25.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c index 5643675ff7241..bf78073ee7fd9 100644 --- a/drivers/net/wan/hdlc_x25.c +++ b/drivers/net/wan/hdlc_x25.c @@ -62,11 +62,12 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) { unsigned char *ptr;
- skb_push(skb, 1); - if (skb_cow(skb, 1)) return NET_RX_DROP;
+ skb_push(skb, 1); + skb_reset_network_header(skb); + ptr = skb->data; *ptr = X25_IFACE_DATA;
@@ -79,6 +80,13 @@ static int x25_data_indication(struct net_device *dev, struct sk_buff *skb) static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb) { hdlc_device *hdlc = dev_to_hdlc(dev); + + skb_reset_network_header(skb); + skb->protocol = hdlc_type_trans(skb, dev); + + if (dev_nit_active(dev)) + dev_queue_xmit_nit(skb, dev); + hdlc->xmit(skb, dev); /* Ignore return value :-( */ }
@@ -93,6 +101,7 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev) switch (skb->data[0]) { case X25_IFACE_DATA: /* Data to be transmitted */ skb_pull(skb, 1); + skb_reset_network_header(skb); if ((result = lapb_data_request(dev, skb)) != LAPB_OK) dev_kfree_skb(skb); return NETDEV_TX_OK;