diff options
| -rw-r--r-- | lib/prefix.c | 42 |
1 files changed, 39 insertions, 3 deletions
diff --git a/lib/prefix.c b/lib/prefix.c index 7d246000..4be3ba20 100644 --- a/lib/prefix.c +++ b/lib/prefix.c @@ -31,7 +31,7 @@ /* Maskbit. */ static const u_char maskbit[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff}; -static const u_int32_t maskbytes[] = +static const u_int32_t maskbytes_host[] = { 0x00000000, /* /0 0.0.0.0 */ 0x80000000, /* /1 128.0.0.0 */ @@ -67,6 +67,42 @@ static const u_int32_t maskbytes[] = 0xfffffffe, /* /31 255.255.255.254 */ 0xffffffff /* /32 255.255.255.255 */ }; +static const u_int32_t maskbytes_network[] = +{ + 0x00000000, /* /0 0.0.0.0 */ + 0x00000080, /* /1 128.0.0.0 */ + 0x000000c0, /* /2 192.0.0.0 */ + 0x000000e0, /* /3 224.0.0.0 */ + 0x000000f0, /* /4 240.0.0.0 */ + 0x000000f8, /* /5 248.0.0.0 */ + 0x000000fc, /* /6 252.0.0.0 */ + 0x000000fe, /* /7 254.0.0.0 */ + 0x000000ff, /* /8 255.0.0.0 */ + 0x000080ff, /* /9 255.128.0.0 */ + 0x0000c0ff, /* /10 255.192.0.0 */ + 0x0000e0ff, /* /11 255.224.0.0 */ + 0x0000f0ff, /* /12 255.240.0.0 */ + 0x0000f8ff, /* /13 255.248.0.0 */ + 0x0000fcff, /* /14 255.252.0.0 */ + 0x0000feff, /* /15 255.254.0.0 */ + 0x0000ffff, /* /16 255.255.0.0 */ + 0x0080ffff, /* /17 255.255.128.0 */ + 0x00c0ffff, /* /18 255.255.192.0 */ + 0x00e0ffff, /* /19 255.255.224.0 */ + 0x00f0ffff, /* /20 255.255.240.0 */ + 0x00f8ffff, /* /21 255.255.248.0 */ + 0x00fcffff, /* /22 255.255.252.0 */ + 0x00feffff, /* /23 255.255.254.0 */ + 0x00ffffff, /* /24 255.255.255.0 */ + 0x80ffffff, /* /25 255.255.255.128 */ + 0xc0ffffff, /* /26 255.255.255.192 */ + 0xe0ffffff, /* /27 255.255.255.224 */ + 0xf0ffffff, /* /28 255.255.255.240 */ + 0xf8ffffff, /* /29 255.255.255.248 */ + 0xfcffffff, /* /30 255.255.255.252 */ + 0xfeffffff, /* /31 255.255.255.254 */ + 0xffffffff /* /32 255.255.255.255 */ +}; /* Number of bits in prefix type. */ #ifndef PNBBY @@ -337,12 +373,12 @@ str2prefix_ipv4 (const char *str, struct prefix_ipv4 *p) return ret; } -/* Convert masklen into IP address's netmask. */ +/* Convert masklen into IP address's netmask (network byte order). */ void masklen2ip (const int masklen, struct in_addr *netmask) { assert (masklen >= 0 && masklen <= 32); - netmask->s_addr = maskbytes[masklen]; + netmask->s_addr = maskbytes_network[masklen]; } /* Convert IP address's netmask into integer. We assume netmask is |