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Allow general masking of IPv4 addresses rather than just CIDR masks.

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OF1.1 and later make these fields fully maskable so we might as well also.

Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-05-22 22:06:03 -07:00
parent 410698cf7d
commit c08201d664
7 changed files with 46 additions and 22 deletions
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7
lib/packets.c
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@@ -246,12 +246,13 @@ eth_addr_bitand(const uint8_t src[ETH_ADDR_LEN],
}
/* Given the IP netmask 'netmask', returns the number of bits of the IP address
* that it specifies, that is, the number of 1-bits in 'netmask'. 'netmask'
* must be a CIDR netmask (see ip_is_cidr()). */
* that it specifies, that is, the number of 1-bits in 'netmask'.
*
* If 'netmask' is not a CIDR netmask (see ip_is_cidr()), the return value will
* still be in the valid range but isn't otherwise meaningful. */
int
ip_count_cidr_bits(ovs_be32 netmask)
{
assert(ip_is_cidr(netmask));
return 32 - ctz(ntohl(netmask));
}