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etherdevice.h & bridge: netfilter: Add and use ether_addr_equal_masked

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There are code duplications of a masked ethernet address comparison here
so make it a separate function instead.

Miscellanea:

o Neaten alignment of FWINV macro uses to make it clearer for the reader

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Joe Perches
2016-06-24 11:32:26 -07:00
committed by Pablo Neira Ayuso
parent 468b021b94
commit 4ae89ad924
4 changed files with 57 additions and 49 deletions
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23
include/linux/etherdevice.h
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@@ -373,6 +373,29 @@ static inline bool ether_addr_equal_unaligned(const u8 *addr1, const u8 *addr2)
#endif
}
/**
* ether_addr_equal_masked - Compare two Ethernet addresses with a mask
* @addr1: Pointer to a six-byte array containing the 1st Ethernet address
* @addr2: Pointer to a six-byte array containing the 2nd Ethernet address
* @mask: Pointer to a six-byte array containing the Ethernet address bitmask
*
* Compare two Ethernet addresses with a mask, returns true if for every bit
* set in the bitmask the equivalent bits in the ethernet addresses are equal.
* Using a mask with all bits set is a slower ether_addr_equal.
*/
static inline bool ether_addr_equal_masked(const u8 *addr1, const u8 *addr2,
const u8 *mask)
{
int i;
for (i = 0; i < ETH_ALEN; i++) {
if ((addr1[i] ^ addr2[i]) & mask[i])
return false;
}
return true;
}
/**
* is_etherdev_addr - Tell if given Ethernet address belongs to the device.
* @dev: Pointer to a device structure