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[libc] Add IN6_IS_ADDR_MC* #172643

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Merged
c8ef merged 4 commits into from
Dec 18, 2025
+69 −0
Merged

[libc] Add IN6_IS_ADDR_MC* #172643

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db2ebda
[libc] Add `IN6_IS_ADDR_UNSPECIFIED`
c8ef Dec 15, 2025
77c407b
[libc] Add `IN6_IS_ADDR_LOOPBACK`
c8ef Dec 15, 2025
8e34a2d
[libc] Add `IN6_IS_ADDR_MULTICAST`
c8ef Dec 16, 2025
27557d0
[libc] Add `IN6_IS_ADDR_MC*`
c8ef Dec 17, 2025
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38 changes: 38 additions & 0 deletions libc/include/llvm-libc-macros/netinet-in-macros.h
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,24 @@
// int and takes a single argument of type const struct in6_addr *:
// https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html

#define IN6_IS_ADDR_UNSPECIFIED(a) \
((__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[0]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[1]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[2]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[3]) == 0)

#define IN6_IS_ADDR_LOOPBACK(a) \
((__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[0]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[1]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint32_t *, a)[2]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[12]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[13]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[14]) == 0 && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[15]) == 1)

#define IN6_IS_ADDR_MULTICAST(a) \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xff

#define IN6_IS_ADDR_LINKLOCAL(a) \
((__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xfe && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xc0) == 0x80)
Expand All @@ -46,4 +64,24 @@
((__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xfe && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xc0) == 0xc0)

#define IN6_IS_ADDR_MC_NODELOCAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xf) == 0x1)

#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xf) == 0x2)

#define IN6_IS_ADDR_MC_SITELOCAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xf) == 0x5)

#define IN6_IS_ADDR_MC_ORGLOCAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xf) == 0x8)

#define IN6_IS_ADDR_MC_GLOBAL(a) \
(IN6_IS_ADDR_MULTICAST(a) && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xf) == 0xe)

#endif // LLVM_LIBC_MACROS_NETINET_IN_MACROS_H
31 changes: 31 additions & 0 deletions libc/test/include/netinet_in_test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,23 @@
TEST(LlvmLibcNetinetInTest, IN6Macro) {
char buff[16] = {};

EXPECT_TRUE(IN6_IS_ADDR_UNSPECIFIED(buff));
for (int i = 0; i < 16; ++i) {
buff[i] = 1;
EXPECT_FALSE(IN6_IS_ADDR_UNSPECIFIED(buff));
buff[i] = 0;
}

EXPECT_FALSE(IN6_IS_ADDR_LOOPBACK(buff));
buff[15] = 1;
EXPECT_TRUE(IN6_IS_ADDR_LOOPBACK(buff));
buff[15] = 0;

EXPECT_FALSE(IN6_IS_ADDR_MULTICAST(buff));
buff[0] = 0xff;
EXPECT_TRUE(IN6_IS_ADDR_MULTICAST(buff));
buff[0] = 0;

buff[0] = 0xfe;
buff[1] = 0x80;
EXPECT_TRUE(IN6_IS_ADDR_LINKLOCAL(buff));
Expand All @@ -25,4 +42,18 @@ TEST(LlvmLibcNetinetInTest, IN6Macro) {
buff[0] = 0xff;
buff[1] = 0x80;
EXPECT_FALSE(IN6_IS_ADDR_SITELOCAL(buff));

buff[0] = 0xff;
buff[1] = 0x1;
EXPECT_TRUE(IN6_IS_ADDR_MC_NODELOCAL(buff));
buff[1] = 0x2;
EXPECT_TRUE(IN6_IS_ADDR_MC_LINKLOCAL(buff));
buff[1] = 0x5;
EXPECT_TRUE(IN6_IS_ADDR_MC_SITELOCAL(buff));
buff[1] = 0x8;
EXPECT_TRUE(IN6_IS_ADDR_MC_ORGLOCAL(buff));
buff[1] = 0xe;
EXPECT_TRUE(IN6_IS_ADDR_MC_GLOBAL(buff));
buff[1] = 0;
buff[0] = 0;
}
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