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Lib: Allow use of 240.0.0.0/4 as a private range
There were several requests to allow use of 240.0.0.0/4 as a private range, and Linux kernel already allows such routes, so perhaps we can allow that too. Thanks to Vincent Bernat and others for suggestion and patches.
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parent
c3828879a3
commit
269bfff9bf
24
lib/ip.c
24
lib/ip.c
@ -85,25 +85,29 @@ ip4_classify(ip4_addr ad)
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u32 a = _I(ad);
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u32 b = a >> 24U;
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if (b && b <= 0xdf)
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if (b < 0xe0)
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{
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if (b == 0x7f)
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if (b == 0x00) /* 0.0.0.0/8 This network */
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return IADDR_INVALID;
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if (b == 0x7f) /* 127.0.0.0/8 Loopback address */
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return IADDR_HOST | SCOPE_HOST;
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else if ((b == 0x0a) ||
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((a & 0xffff0000) == 0xc0a80000) ||
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((a & 0xfff00000) == 0xac100000))
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if ((b == 0x0a) || /* 10.0.0.0/8 Private range */
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((a & 0xffff0000) == 0xc0a80000) || /* 192.168.0.0/16 Private range */
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((a & 0xfff00000) == 0xac100000)) /* 172.16.0.0/12 Private range */
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return IADDR_HOST | SCOPE_SITE;
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else
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return IADDR_HOST | SCOPE_UNIVERSE;
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return IADDR_HOST | SCOPE_UNIVERSE;
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}
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if (b >= 0xe0 && b <= 0xef)
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if (b < 0xf0) /* 224.0.0.0/4 Multicast address */
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return IADDR_MULTICAST | SCOPE_UNIVERSE;
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if (a == 0xffffffff)
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if (a == 0xffffffff) /* 255.255.255.255 Broadcast address */
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return IADDR_BROADCAST | SCOPE_LINK;
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return IADDR_INVALID;
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return IADDR_HOST | SCOPE_SITE; /* 240.0.0.0/4 Reserved / private */
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}
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int
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