net: Add IN6_IS_ADDR_LINKLOCAL macro

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2022-09-18 02:58:55 +08:00 · 2022-09-18 02:58:55 +08:00 · 53466c6d46
parent 6903f02d41
commit 53466c6d46
1 changed files with 3 additions and 0 deletions
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@ -193,6 +193,9 @@
 #define IN6_IS_ADDR_MULTICAST(a) \
  ((a)->s6_addr[0] == 0xff)

+#define IN6_IS_ADDR_LINKLOCAL(a) \
+  ((a)->s6_addr16[0] & HTONS(0xffc0) == HTONS(0xfe80))
+
 #define IN6_IS_ADDR_LOOPBACK(a) \
  ((a)->s6_addr32[0] == 0 && \
   (a)->s6_addr32[1] == 0 && \