[ovs-dev] [RFC PATCH v2 1/2] miniflow_extract: Properly handle small IP packets.

Ben Pfaff blp at nicira.com
Thu Nov 6 23:58:20 UTC 2014


On Wed, Nov 05, 2014 at 10:37:18AM -0800, Jarno Rajahalme wrote:
> Ethernet frames may contain padding after the IP payload.  When
> parsing IP packets, check the IP total size (IPv4) or IP payload size
> (IPv6) to detect the size of l2 padding.  The l2 padding size is
> stored in the ofpbuf to prevent ofpbuf_pull from entering the padding,
> as well as to allow ofpbuf_l4_size() to return the size of the IP
> payload without the l2 padding.
> 
> This helps avoiding parsing truncated transport headers, for example.
> 
> Signed-off-by: Jarno Rajahalme <jrajahalme at nicira.com>

Acked-by: Ben Pfaff <blp at nicira.com>



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