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packets: Add more utility functions for IPv4 and IPv6 addresses.

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We had these functions scattered around the source tree anyway.  packets.h
is a good place to centralize them.

I do plan to introduce some additional callers.
This commit is contained in:
Ben Pfaff
2011-08-17 10:55:15 -07:00
parent e7ed3a3a5f
commit aad29cd1a1
7 changed files with 119 additions and 45 deletions
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16
lib/ofp-util.c
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@@ -59,22 +59,12 @@ ofputil_wcbits_to_netmask(int wcbits)
}
/* Given the IP netmask 'netmask', returns the number of bits of the IP address
* that it wildcards. 'netmask' must be a CIDR netmask (see ip_is_cidr()). */
* that it wildcards, that is, the number of 0-bits in 'netmask'. 'netmask'
* must be a CIDR netmask (see ip_is_cidr()). */
int
ofputil_netmask_to_wcbits(ovs_be32 netmask)
{
assert(ip_is_cidr(netmask));
#if __GNUC__ >= 4
return netmask == htonl(0) ? 32 : __builtin_ctz(ntohl(netmask));
#else
int wcbits;
for (wcbits = 32; netmask; wcbits--) {
netmask &= netmask - 1;
}
return wcbits;
#endif
return 32 - ip_count_cidr_bits(netmask);
}
/* A list of the FWW_* and OFPFW_ bits that have the same value, meaning, and