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From: rahul b jain cs student <rbj2@oak.njit.edu>
To: linux-kernel@vger.kernel.org
Subject: Question about ip_rcv() function
Date: Wed, 23 Jun 2004 14:45:47 -0400 (EDT)	[thread overview]
Message-ID: <Pine.GSO.4.58.0406231441500.7099@chrome.njit.edu> (raw)
In-Reply-To: <20040622212403.21346.qmail@lwn.net>

Hi,

can anyone explain what is the difference between the following two pieces
of code.

1. if (!pskb_may_pull(skb, sizeof(struct iphdr)))
                goto inhdr_error;

   iph = skb->nh.iph;

2. if (!pskb_may_pull(skb, iph->ihl*4))
                goto inhdr_error;

   iph = skb->nh.iph;


Also, does anyone know how the headers are stripped from the packet at the
receiving end. Does the function __pskb_pull_tail() strip of the header fields ?

Thanks,
Rahul.

  parent reply	other threads:[~2004-06-23 18:46 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-06-22 20:48 sk_buff structure rahul b jain cs student
2004-06-22 21:24 ` Jonathan Corbet
2004-06-22 23:03   ` rahul b jain cs student
2004-06-23 18:45   ` rahul b jain cs student [this message]
2004-06-23 18:50     ` Question about ip_rcv() function David S. Miller
2004-06-23 20:22       ` rahul b jain cs student
2004-06-23 20:32         ` David S. Miller
2004-06-23 20:43           ` rahul b jain cs student

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