[llvm-branch-commits] [libc] [libc] Add `IN6_IS_ADDR_MULTICAST` (PR #172498)

[Connector Switch via llvm-branch-commits]

https://github.com/c8ef created https://github.com/llvm/llvm-project/pull/172498

None

>From 8e34a2da81601b39d5ae78d51e0e45be7067d00c Mon Sep 17 00:00:00 2001
From: c8ef <c8ef at outlook.com>
Date: Tue, 16 Dec 2025 23:11:31 +0800
Subject: [PATCH] [libc] Add `IN6_IS_ADDR_MULTICAST`

---
 libc/include/llvm-libc-macros/netinet-in-macros.h | 3 +++
 libc/test/include/netinet_in_test.cpp             | 5 +++++
 2 files changed, 8 insertions(+)

diff --git a/libc/include/llvm-libc-macros/netinet-in-macros.h b/libc/include/llvm-libc-macros/netinet-in-macros.h
index 3148aed6bb112..863ff8759e446 100644
--- a/libc/include/llvm-libc-macros/netinet-in-macros.h
+++ b/libc/include/llvm-libc-macros/netinet-in-macros.h
@@ -53,6 +53,9 @@
    (__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)
diff --git a/libc/test/include/netinet_in_test.cpp b/libc/test/include/netinet_in_test.cpp
index 15e57ccef7ac5..e8cb8e48ff4b4 100644
--- a/libc/test/include/netinet_in_test.cpp
+++ b/libc/test/include/netinet_in_test.cpp
@@ -24,6 +24,11 @@ TEST(LlvmLibcNetinetInTest, IN6Macro) {
   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));