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Date: Wed, 11 Jul 2012 16:17:19 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Jerry Yu <jerryy@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Protocol handler using dev_add_pack On Wed, 2012-07-11 at 10:38 -0300, Jerry Yu wrote: > I am working on a kernel module to monitor all TCP packets. I created a protocol > handler with protocol code ETH_P_ALL to handle all incoming and outgoing > TCP packets. The code worked fine on 2.6.14 kernel, but in current 3.2.0-26 > kernel, I am no longer able to get the TCP payload for outgoing packets. > The data in TCP payload section of skb->data are mainly 0x00. I am still > able to get incoming TCP packets' payloads though. > > Is there any change in 3.2.0 or other early kernel versions that will cause > this issue? Maybe you make wrong assumptions in your code. skb->data doesnt exactly contains tcp payload of locally generated TCP packets, unless you disabled scatter-gather on the NIC ehtool -K eth0 sg off -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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