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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Sven Eckelmann <sven@narfation.org>
Cc: netdev@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org
Subject: [B.A.T.M.A.N.] question about frag_can_reassemble()
Date: Fri, 30 Mar 2012 23:02:37 +0300	[thread overview]
Message-ID: <20120330200236.GH3289@mwanda> (raw)

Hi Sven,

I had a question about the code in frag_can_reassemble().

net/batman-adv/unicast.h
    51  
    52          merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    53          merged_size += sizeof(struct unicast_packet) + uneven_correction;
    54  
    55          return merged_size <= mtu;
    56  }

Can the skb->len be less than sizeof(*unicast_packet) (ie 20 bytes)?
If "len" is less than 10 then we would return false but if it's
over 10 then we would return true.  Roughly.

regards,
dan carpenter

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Sven Eckelmann <sven-KaDOiPu9UxWEi8DpZVb4nw@public.gmane.org>
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	b.a.t.m.a.n-ZwoEplunGu2X36UT3dwllkB+6BGkLq7r@public.gmane.org
Subject: question about frag_can_reassemble()
Date: Fri, 30 Mar 2012 23:02:37 +0300	[thread overview]
Message-ID: <20120330200236.GH3289@mwanda> (raw)

Hi Sven,

I had a question about the code in frag_can_reassemble().

net/batman-adv/unicast.h
    51  
    52          merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    53          merged_size += sizeof(struct unicast_packet) + uneven_correction;
    54  
    55          return merged_size <= mtu;
    56  }

Can the skb->len be less than sizeof(*unicast_packet) (ie 20 bytes)?
If "len" is less than 10 then we would return false but if it's
over 10 then we would return true.  Roughly.

regards,
dan carpenter

             reply	other threads:[~2012-03-30 20:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-30 20:02 Dan Carpenter [this message]
2012-03-30 20:02 ` question about frag_can_reassemble() Dan Carpenter
2012-03-31  8:52 ` [B.A.T.M.A.N.] " Marek Lindner
2012-03-31  8:52   ` Marek Lindner

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