diff options
| -rw-r--r-- | lib/ip.c | 24 |
1 files changed, 14 insertions, 10 deletions
@@ -85,25 +85,29 @@ ip4_classify(ip4_addr ad) u32 a = _I(ad); u32 b = a >> 24U; - if (b && b <= 0xdf) + if (b < 0xe0) { - if (b == 0x7f) + if (b == 0x00) /* 0.0.0.0/8 This network */ + return IADDR_INVALID; + + if (b == 0x7f) /* 127.0.0.0/8 Loopback address */ return IADDR_HOST | SCOPE_HOST; - else if ((b == 0x0a) || - ((a & 0xffff0000) == 0xc0a80000) || - ((a & 0xfff00000) == 0xac100000)) + + if ((b == 0x0a) || /* 10.0.0.0/8 Private range */ + ((a & 0xffff0000) == 0xc0a80000) || /* 192.168.0.0/16 Private range */ + ((a & 0xfff00000) == 0xac100000)) /* 172.16.0.0/12 Private range */ return IADDR_HOST | SCOPE_SITE; - else - return IADDR_HOST | SCOPE_UNIVERSE; + + return IADDR_HOST | SCOPE_UNIVERSE; } - if (b >= 0xe0 && b <= 0xef) + if (b < 0xf0) /* 224.0.0.0/4 Multicast address */ return IADDR_MULTICAST | SCOPE_UNIVERSE; - if (a == 0xffffffff) + if (a == 0xffffffff) /* 255.255.255.255 Broadcast address */ return IADDR_BROADCAST | SCOPE_LINK; - return IADDR_INVALID; + return IADDR_HOST | SCOPE_SITE; /* 240.0.0.0/4 Reserved / private */ } int |