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net: Add function for parsing the header length out of linear ethernet frames

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This patch updates some of the flow_dissector api so that it can be used to
parse the length of ethernet buffers stored in fragments.  Most of the
changes needed were to __skb_get_poff as it needed to be updated to support
sending a linear buffer instead of a skb.

I have split __skb_get_poff into two functions, the first is skb_get_poff
and it retains the functionality of the original __skb_get_poff.  The other
function is __skb_get_poff which now works much like __skb_flow_dissect in
relation to skb_flow_dissect in that it provides the same functionality but
works with just a data buffer and hlen instead of needing an skb.

Signed-off-by: Alexander Duyck <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexander Duyck 2014-09-05 19:20:26 -04:00 • committed by David S. Miller
commit 56193d1bce
6 changed files with 66 additions and 16 deletions
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27
net/ethernet/eth.c
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@ -145,6 +145,33 @@ int eth_rebuild_header(struct sk_buff *skb)
}
EXPORT_SYMBOL(eth_rebuild_header);
/**
* eth_get_headlen - determine the the length of header for an ethernet frame
* @data: pointer to start of frame
* @len: total length of frame
*
* Make a best effort attempt to pull the length for all of the headers for
* a given frame in a linear buffer.
*/
u32 eth_get_headlen(void *data, unsigned int len)
{
const struct ethhdr *eth = (const struct ethhdr *)data;
struct flow_keys keys;
/* this should never happen, but better safe than sorry */
if (len < sizeof(*eth))
return len;
/* parse any remaining L2/L3 headers, check for L4 */
if (!__skb_flow_dissect(NULL, &keys, data,
eth->h_proto, sizeof(*eth), len))
return max_t(u32, keys.thoff, sizeof(*eth));
/* parse for any L4 headers */
return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
}
EXPORT_SYMBOL(eth_get_headlen);
/**
* eth_type_trans - determine the packet's protocol ID.
* @skb: received socket data