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LibC: Add Ipv6 address checking macros to netinet/in.h

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To be able to port c-ares the IN6_IS_ADDR_V4COMPAT and
various macros of the form IN6_IS_ADDR_MC_XX_LOCAL were added
as well as the IN_CLASS{A,B} macros
This commit is contained in:
Nicolas Josef Zunker 2023-04-29 11:58:53 +02:00 • committed by Andrew Kaster
parent d430ee8bec
commit 3aadc09c53
1 changed files with 25 additions and 1 deletions
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26
Userland/Libraries/LibC/netinet/in.h
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@ -42,6 +42,9 @@ static inline uint32_t ntohl(uint32_t value)
return htonl(value);
}
#define IN_CLASSA(addr) ((((uint32_t)(addr)) & (128 << 24)) == 0)
#define IN_CLASSB(addr) ((((uint32_t)(addr)) & (192 << 24)) == (128 << 24))
#define IN_MULTICAST(x) (((x)&0xf0000000) == 0xe0000000)
// NOTE: The IPv6 Addressing Scheme that we detect are documented in RFC# 2373.
@ -52,15 +55,36 @@ static inline uint32_t ntohl(uint32_t value)
((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_V4COMPAT(addr) \
((addr)->s6_addr32[0] == 0 && ((addr)->s6_addr32[1]) == 0 && ((addr)->s6_addr32[2]) == 0 && ntohl((addr)->s6_addr32[3]) >= 2)
#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))
(((addr)->s6_addr[0] == 0xfe) && ((addr)->s6_addr[1] == 0x80) && ((addr)->s6_addr[2] == 0) && ((addr)->s6_addr[3] == 0) && (((addr)->s6_addr32[1]) == 0))
#define IN6_IS_ADDR_SITELOCAL(addr) \
((addr)->s6_addr[0] == 0xfe && (addr)->s6_addr[1] == 0xc0 && (addr)->s6_addr[2] == 0 && (addr)->s6_addr[3] == 0 && (addr)->s6_addr[4] == 0 && (addr)->s6_addr[5] == 0)
// RFC# 2373 - 2.7 Multicast Addresses
#define IN6_IS_ADDR_MULTICAST(addr) \
((addr)->s6_addr[0] == 0xff)
#define IN6_IS_ADDR_MC_NODELOCAL(addr) \
(IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x1))
#define IN6_IS_ADDR_MC_LINKLOCAL(addr) \
(IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x2))
#define IN6_IS_ADDR_MC_SITELOCAL(addr) \
(IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x5))
#define IN6_IS_ADDR_MC_ORGLOCAL(addr) \
(IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0x8))
#define IN6_IS_ADDR_MC_GLOBAL(addr) \
(IN6_IS_ADDR_MULTICAST(addr) && (((addr)->s6_addr[1] & 0xf) == 0xe))
__END_DECLS