kernel 2.6.35: ixgbe: skip non IPv4 packets in ATR filter

Hello,

In driver ixgbe, ixgbe_atr may cause crashes for non-ipv4 packets. Just 
add a test to check skb->protocol:

 From fcb81aa89b6819f95349a4ed8c30f0629430aa1d Mon Sep 17 00:00:00 2001
From: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
Date: Thu, 17 Jun 2010 16:02:14 +0200
Subject: [PATCH] ixgbe: skip non IPv4 packets in ATR filter

It may crash on short packets due to ip_hdr() access.

Signed-off-by: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
---
 drivers/net/ixgbe/ixgbe_main.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

        struct iphdr *iph = ip_hdr(skb);
@@ -6028,6 +6027,10 @@ static void ixgbe_atr(struct ixgbe_adapter 
*adapter, struct sk_buff *skb,
        u32 src_ipv4_addr, dst_ipv4_addr;
        u8 l4type = 0;
 
+       /* Right now, we support IPv4 only */
+       if (skb->protocol != htons(ETH_P_IP))
+               return;
+
        /* check if we're UDP or TCP */
        if (iph->protocol == IPPROTO_TCP) {
                th = tcp_hdr(skb);

>-----Original Message-----
>From: netdev-owner@vger.kernel.org [mailto:netdev-owner@vger.kernel.org] On
>Behalf Of Guillaume Gaudonville
>Sent: Monday, June 21, 2010 6:05 AM
>To: netdev@vger.kernel.org
>Cc: Kirsher, Jeffrey T; Waskiewicz Jr, Peter P; Chilakala, Mallikarjuna
>Subject: [PATCH] kernel 2.6.35: ixgbe: skip non IPv4 packets in ATR filter
>
>Hello,
>
>In driver ixgbe, ixgbe_atr may cause crashes for non-ipv4 packets. Just
>add a test to check skb->protocol:
>
> From fcb81aa89b6819f95349a4ed8c30f0629430aa1d Mon Sep 17 00:00:00 2001
>From: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
>Date: Thu, 17 Jun 2010 16:02:14 +0200
>Subject: [PATCH] ixgbe: skip non IPv4 packets in ATR filter
>
>It may crash on short packets due to ip_hdr() access.
>
>Signed-off-by: Guillaume Gaudonville <guillaume.gaudonville@6wind.com>
>---
> drivers/net/ixgbe/ixgbe_main.c |    5 ++++-
> 1 files changed, 4 insertions(+), 1 deletions(-)
>
>diff --git a/drivers/net/ixgbe/ixgbe_main.c
>b/drivers/net/ixgbe/ixgbe_main.c
>index b2af2f6..3581dbe 100644
>--- a/drivers/net/ixgbe/ixgbe_main.c
>+++ b/drivers/net/ixgbe/ixgbe_main.c
>@@ -6019,7 +6019,6 @@ static void ixgbe_tx_queue(struct ixgbe_adapter
>*adapter,
> static void ixgbe_atr(struct ixgbe_adapter *adapter, struct sk_buff *skb,
>                      int queue, u32 tx_flags)
> {
>-       /* Right now, we support IPv4 only */
>        struct ixgbe_atr_input atr_input;
>        struct tcphdr *th;
>        struct iphdr *iph = ip_hdr(skb);
>@@ -6028,6 +6027,10 @@ static void ixgbe_atr(struct ixgbe_adapter
>*adapter, struct sk_buff *skb,
>        u32 src_ipv4_addr, dst_ipv4_addr;
>        u8 l4type = 0;
>
>+       /* Right now, we support IPv4 only */
>+       if (skb->protocol != htons(ETH_P_IP))
>+               return;
>+
>        /* check if we're UDP or TCP */
>        if (iph->protocol == IPPROTO_TCP) {
>                th = tcp_hdr(skb);
>--
>1.5.6.5
>
>--
>Guillaume Gaudonville
>guillaume.gaudonville@6wind.com
>
>--
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This patch has been pulled into our internal tree for testing.  

Thanks,
-Don 
<donald.c.skidmore@intel.com>
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