From: Martin Schiller <ms@dev.tdt.de>
To: kubakici@wp.pl, khc@pm.waw.pl, davem@davemloft.net
Cc: linux-x25@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, Martin Schiller <ms@dev.tdt.de>
Subject: [PATCH v2 2/2] wan/hdlc_x25: fix skb handling
Date: Tue, 14 Jan 2020 15:02:23 +0100 [thread overview]
Message-ID: <20200114140223.22446-2-ms@dev.tdt.de> (raw)
In-Reply-To: <20200114140223.22446-1-ms@dev.tdt.de>
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>
---
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 0479a2bf42f7..9eaad151c27f 100644
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -71,11 +71,12 @@ 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;
@@ -88,6 +89,13 @@ 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 :-( */
}
@@ -102,6 +110,7 @@ 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;
--
2.20.1
next prev parent reply other threads:[~2020-01-14 14:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 14:02 [PATCH v2 1/2] wan/hdlc_x25: make lapb params configurable Martin Schiller
2020-01-14 14:02 ` Martin Schiller [this message]
2020-01-15 21:43 ` David Miller
2020-01-16 6:03 ` Martin Schiller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200114140223.22446-2-ms@dev.tdt.de \
--to=ms@dev.tdt.de \
--cc=davem@davemloft.net \
--cc=khc@pm.waw.pl \
--cc=kubakici@wp.pl \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-x25@vger.kernel.org \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).