[libc] Add IN6_IS_ADDR_MC*
#172643
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[libc] Add IN6_IS_ADDR_MC*
#172643
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@llvm/pr-subscribers-libc Author: Connector Switch (c8ef) ChangesFull diff: https://github.com/llvm/llvm-project/pull/172643.diff 2 Files Affected:
diff --git a/libc/include/llvm-libc-macros/netinet-in-macros.h b/libc/include/llvm-libc-macros/netinet-in-macros.h
index 863ff8759e446..88ffe92756b16 100644
--- a/libc/include/llvm-libc-macros/netinet-in-macros.h
+++ b/libc/include/llvm-libc-macros/netinet-in-macros.h
@@ -64,4 +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
diff --git a/libc/test/include/netinet_in_test.cpp b/libc/test/include/netinet_in_test.cpp
index e8cb8e48ff4b4..72500c4d51438 100644
--- a/libc/test/include/netinet_in_test.cpp
+++ b/libc/test/include/netinet_in_test.cpp
@@ -42,4 +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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This was referenced Dec 17, 2025
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Base automatically changed from
users/c8ef/12-16-_libc_add_in6_is_addr_multicast_
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main
December 18, 2025 15:10
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This patch adds the
IN6_IS_ADDR_MC*macro, which checks whether an address is multicast node-local address, multicast link-local address, multicast site-local address, multicast organization-local address and multicast global address.