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igb: Mask off check of frag_off as we only want fragment offset

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We were incorrectly checking the entire frag_off field when we only wanted the
fragment offset.  As a result we were not pulling in TCP headers when the DNF
flag was set.

To correct that we will now check for frag off using the IP_OFFSET mask.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2013-02-01 08:56:47 +00:00 committed by Jeff Kirsher
parent 5c17a20372
commit b9555f6627
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/intel/igb/igb_main.c
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@ -6472,7 +6472,7 @@ static unsigned int igb_get_headlen(unsigned char *data,
return hdr.network - data;
/* record next protocol if header is present */
if (!hdr.ipv4->frag_off)
if (!(hdr.ipv4->frag_off & htons(IP_OFFSET)))
nexthdr = hdr.ipv4->protocol;
} else if (protocol == __constant_htons(ETH_P_IPV6)) {
if ((hdr.network - data) > (max_len - sizeof(struct ipv6hdr)))