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LibC: Add IN6_IS_ADDR_LINKLOCAL to in.h

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I tried the OpenSSH port but it failed to compile due to a missing
definition of this macro. It's simple enough to add, and it's addition
allowed OpenSSH to compile once again.

I also went ahead and added spec comments for these macros as well.
This commit is contained in:
Brian Gianforcaro 2022-02-03 00:21:30 -08:00 • committed by Andreas Kling
parent e8857f9b2d
commit 2b14a11238
1 changed files with 9 additions and 0 deletions
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9
Userland/Libraries/LibC/netinet/in.h
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@ -41,10 +41,19 @@ static inline uint32_t ntohl(uint32_t value)
return htonl(value);
}
// NOTE: The IPv6 Addressing Scheme that we detect are documented in RFC# 2373.
// See: https://datatracker.ietf.org/doc/html/rfc2373
// RFC# 2373 - 2.5.3 The Loopback Address
#define IN6_IS_ADDR_LOOPBACK(addr) \
((addr)->s6_addr[0] == 0 && (addr)->s6_addr[1] == 0 && (addr)->s6_addr[2] == 0 && (addr)->s6_addr[3] == 0 && (addr)->s6_addr[4] == 0 && (addr)->s6_addr[5] == 0 && (addr)->s6_addr[6] == 0 && (addr)->s6_addr[7] == 0 && (addr)->s6_addr[8] == 0 && (addr)->s6_addr[9] == 0 && (addr)->s6_addr[10] == 0 && (addr)->s6_addr[11] == 0 && (addr)->s6_addr[12] == 0 && (addr)->s6_addr[13] == 0 && (addr)->s6_addr[14] == 0 && (addr)->s6_addr[15] == 1)
// RFC# 2373 - 2.5.4 IPv6 Addresses with Embedded IPv4 Addresses
#define IN6_IS_ADDR_V4MAPPED(addr) \
((((addr)->s6_addr[0]) == 0) && (((addr)->s6_addr[1]) == 0) && (((addr)->s6_addr[2]) == 0) && (((addr)->s6_addr[3]) == 0) && (((addr)->s6_addr[4]) == 0) && (((addr)->s6_addr[5]) == 0) && (((addr)->s6_addr[6]) == 0) && (((addr)->s6_addr[7]) == 0) && (((addr)->s6_addr[8]) == 0) && (((addr)->s6_addr[9]) == 0) && (((addr)->s6_addr[10]) == 0xFF) && (((addr)->s6_addr[11]) == 0xFF))
// RFC# 2373 - 2.5.8 Local-Use IPv6 Unicast Addresses
#define IN6_IS_ADDR_LINKLOCAL(addr) \
(((addr)->s6_addr[0] == 0xfe) && (((addr)->s6_addr[1] & 0xc0) == 0x80))
__END_DECLS