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[libc] Add IN6_IS_ADDR_{LINK, SITE}LOCAL (#168207)

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This patch introduces two macros in `netinet/in.h`. The redundant tests
for macro values in the testcases have been removed.
This commit is contained in:
Connector Switch
2025-12-13 10:57:38 +08:00
committed by GitHub
parent b3bc005832
commit 62ee2cf0f4
2 changed files with 27 additions and 16 deletions
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12
libc/include/llvm-libc-macros/netinet-in-macros.h
View File

@@ -34,4 +34,16 @@
#define INET_ADDRSTRLEN 16
#define INET6_ADDRSTRLEN 46
// The following macros test for special IPv6 addresses. Each macro is of type
// 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_LINKLOCAL(a) \
((__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xfe && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xc0) == 0x80)
#define IN6_IS_ADDR_SITELOCAL(a) \
((__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[0]) == 0xfe && \
(__LLVM_LIBC_CAST(reinterpret_cast, uint8_t *, a)[1] & 0xc0) == 0xc0)
#endif // LLVM_LIBC_MACROS_NETINET_IN_MACROS_H

31
libc/test/include/netinet_in_test.cpp
View File

@@ -9,21 +9,20 @@
#include "include/llvm-libc-macros/netinet-in-macros.h"
#include "test/UnitTest/Test.h"
TEST(LlvmLibcNetinetInTest, IPPROTOMacro) {
EXPECT_EQ(IPPROTO_IP, 0);
EXPECT_EQ(IPPROTO_ICMP, 1);
EXPECT_EQ(IPPROTO_TCP, 6);
EXPECT_EQ(IPPROTO_UDP, 17);
EXPECT_EQ(IPPROTO_IPV6, 41);
EXPECT_EQ(IPPROTO_RAW, 255);
}
TEST(LlvmLibcNetinetInTest, IN6Macro) {
char buff[16] = {};
TEST(LlvmLibcNetinetInTest, IPV6Macro) {
EXPECT_EQ(IPV6_UNICAST_HOPS, 16);
EXPECT_EQ(IPV6_MULTICAST_IF, 17);
EXPECT_EQ(IPV6_MULTICAST_HOPS, 18);
EXPECT_EQ(IPV6_MULTICAST_LOOP, 19);
EXPECT_EQ(IPV6_JOIN_GROUP, 20);
EXPECT_EQ(IPV6_LEAVE_GROUP, 21);
EXPECT_EQ(IPV6_V6ONLY, 26);
buff[0] = 0xfe;
buff[1] = 0x80;
EXPECT_TRUE(IN6_IS_ADDR_LINKLOCAL(buff));
buff[0] = 0xff;
buff[1] = 0x80;
EXPECT_FALSE(IN6_IS_ADDR_LINKLOCAL(buff));
buff[0] = 0xfe;
buff[1] = 0xc0;
EXPECT_TRUE(IN6_IS_ADDR_SITELOCAL(buff));
buff[0] = 0xff;
buff[1] = 0x80;
EXPECT_FALSE(IN6_IS_ADDR_SITELOCAL(buff));
}