drivers/net/wan/hdlc_x25: Added needed_headroom and a skb->len check

1. Added a skb->len check

This driver expects upper layers to include a pseudo header of 1 byte
when passing down a skb for transmission. This driver will read this
1-byte header. This patch added a skb->len check before reading the
header to make sure the header exists.

2. Added needed_headroom and set hard_header_len to 0

When this driver transmits data,
  first this driver will remove a pseudo header of 1 byte,
  then the lapb module will prepend the LAPB header of 2 or 3 bytes.
So the value of needed_headroom in this driver should be 3 - 1.

Because this driver has no header_ops, according to the logic of
af_packet.c, the value of hard_header_len should be 0.

Reason of setting needed_headroom and hard_header_len at this place:

This driver is written using the API of the hdlc module, the hdlc
module enables this driver (the protocol driver) to run on any hardware
that has a driver (the hardware driver) written using the API of the
hdlc module.

Two other hdlc protocol drivers - hdlc_ppp and hdlc_raw_eth, also set
things like hard_header_len at this place. In hdlc_ppp, it sets
hard_header_len after attach_hdlc_protocol and before setting dev->type.
In hdlc_raw_eth, it sets hard_header_len by calling ether_setup after
attach_hdlc_protocol and after memcpy the settings.

3. Reset needed_headroom when detaching protocols (in hdlc.c)

When detaching a protocol from a hardware device, the hdlc module will
reset various parameters of the device (including hard_header_len) to
the default values. We add needed_headroom here so that needed_headroom
will also be reset.

Cc: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: Martin Schiller <ms@dev.tdt.de>
Cc: Andrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: Xie He <xie.he.0141@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index dfc1677..386ed2a 100644 (file)
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -230,6 +230,7 @@ static void hdlc_setup_dev(struct net_device *dev)
        dev->max_mtu             = HDLC_MAX_MTU;
        dev->type                = ARPHRD_RAWHDLC;
        dev->hard_header_len     = 16;
+       dev->needed_headroom     = 0;
        dev->addr_len            = 0;
        dev->header_ops          = &hdlc_null_ops;
 }

diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
index f70336b..f52b9fe 100644 (file)
--- a/drivers/net/wan/hdlc_x25.c
+++ b/drivers/net/wan/hdlc_x25.c
@@ -107,8 +107,14 @@ static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
 {
        int result;
 
+       /* There should be a pseudo header of 1 byte added by upper layers.
+        * Check to make sure it is there before reading it.
+        */
+       if (skb->len < 1) {
+               kfree_skb(skb);
+               return NETDEV_TX_OK;
+       }
 
-       /* X.25 to LAPB */
        switch (skb->data[0]) {
        case X25_IFACE_DATA:    /* Data to be transmitted */
                skb_pull(skb, 1);
@@ -294,6 +300,15 @@ static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
                        return result;
 
                memcpy(&state(hdlc)->settings, &new_settings, size);
+
+               /* There's no header_ops so hard_header_len should be 0. */
+               dev->hard_header_len = 0;
+               /* When transmitting data:
+                * first we'll remove a pseudo header of 1 byte,
+                * then we'll prepend an LAPB header of at most 3 bytes.
+                */
+               dev->needed_headroom = 3 - 1;
+
                dev->type = ARPHRD_X25;
                call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
                netif_dormant_off(dev);