diff --git a/include/bits/netinet/in.h b/include/bits/netinet/in.h
new file mode 100644
index 0000000000000000000000000000000000000000..c446cc3f85bad7d407fc3f96e5771794f5a8f087
--- /dev/null
+++ b/include/bits/netinet/in.h
@@ -0,0 +1,77 @@
+#ifndef _BITS_NETINET_IN_H
+#define _BITS_NETINET_IN_H
+
+extern const struct in6_addr in6addr_any;
+extern const struct in6_addr in6addr_loopback;
+#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
+#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
+
+// from musl {
+#define IN6_IS_ADDR_UNSPECIFIED(a) \
+        (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
+         ((uint32_t *) (a))[2] == 0 && ((uint32_t *) (a))[3] == 0)
+
+#define IN6_IS_ADDR_LOOPBACK(a) \
+        (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
+         ((uint32_t *) (a))[2] == 0 && \
+         ((uint8_t *) (a))[12] == 0 && ((uint8_t *) (a))[13] == 0 && \
+         ((uint8_t *) (a))[14] == 0 && ((uint8_t *) (a))[15] == 1 )
+
+#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
+
+#define IN6_IS_ADDR_LINKLOCAL(a) \
+        ((((uint8_t *) (a))[0]) == 0xfe && (((uint8_t *) (a))[1] & 0xc0) == 0x80)
+
+#define IN6_IS_ADDR_SITELOCAL(a) \
+        ((((uint8_t *) (a))[0]) == 0xfe && (((uint8_t *) (a))[1] & 0xc0) == 0xc0)
+
+#define IN6_IS_ADDR_V4MAPPED(a) \
+        (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
+         ((uint8_t *) (a))[8] == 0 && ((uint8_t *) (a))[9] == 0 && \
+         ((uint8_t *) (a))[10] == 0xff && ((uint8_t *) (a))[11] == 0xff)
+
+#define IN6_IS_ADDR_V4COMPAT(a) \
+        (((uint32_t *) (a))[0] == 0 && ((uint32_t *) (a))[1] == 0 && \
+         ((uint32_t *) (a))[2] == 0 && ((uint8_t *) (a))[15] > 1)
+
+#define IN6_IS_ADDR_MC_NODELOCAL(a) \
+        (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0x1))
+
+#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
+        (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0x2))
+
+#define IN6_IS_ADDR_MC_SITELOCAL(a) \
+        (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0x5))
+
+#define IN6_IS_ADDR_MC_ORGLOCAL(a) \
+        (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0x8))
+
+#define IN6_IS_ADDR_MC_GLOBAL(a) \
+        (IN6_IS_ADDR_MULTICAST(a) && ((((uint8_t *) (a))[1] & 0xf) == 0xe))
+
+#define __ARE_4_EQUAL(a,b) \
+	(!( (0[a]-0[b]) | (1[a]-1[b]) | (2[a]-2[b]) | (3[a]-3[b]) ))
+#define IN6_ARE_ADDR_EQUAL(a,b) \
+	__ARE_4_EQUAL((const uint32_t *)(a), (const uint32_t *)(b))
+
+#define	IN_CLASSA(a)		((((in_addr_t)(a)) & 0x80000000) == 0)
+#define	IN_CLASSA_NET		0xff000000
+#define	IN_CLASSA_NSHIFT	24
+#define	IN_CLASSA_HOST		(0xffffffff & ~IN_CLASSA_NET)
+#define	IN_CLASSA_MAX		128
+#define	IN_CLASSB(a)		((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
+#define	IN_CLASSB_NET		0xffff0000
+#define	IN_CLASSB_NSHIFT	16
+#define	IN_CLASSB_HOST		(0xffffffff & ~IN_CLASSB_NET)
+#define	IN_CLASSB_MAX		65536
+#define	IN_CLASSC(a)		((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
+#define	IN_CLASSC_NET		0xffffff00
+#define	IN_CLASSC_NSHIFT	8
+#define	IN_CLASSC_HOST		(0xffffffff & ~IN_CLASSC_NET)
+#define	IN_CLASSD(a)		((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
+#define	IN_MULTICAST(a)		IN_CLASSD(a)
+#define	IN_EXPERIMENTAL(a)	((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
+#define	IN_BADCLASS(a) ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
+// } from musl
+
+#endif // _BITS_NETINET_IN_H
diff --git a/src/header/netinet_in/cbindgen.toml b/src/header/netinet_in/cbindgen.toml
index 53b7362a43283b541e949f5dab2a0decfde20273..3320c1ab5b3b5f9325a36e5acf5668049bf281e3 100644
--- a/src/header/netinet_in/cbindgen.toml
+++ b/src/header/netinet_in/cbindgen.toml
@@ -1,5 +1,6 @@
 sys_includes = ["sys/types.h", "sys/socket.h"]
 include_guard = "_NETINET_IN_H"
+trailer = "#include <bits/netinet/in.h>"
 language = "C"
 style = "Tag"
 
diff --git a/src/header/netinet_in/mod.rs b/src/header/netinet_in/mod.rs
index 315ef9a7e4bf50d65fc43771bd2ac36225446c27..78ff911b45b7a76c67beefaba4285a53967734e1 100644
--- a/src/header/netinet_in/mod.rs
+++ b/src/header/netinet_in/mod.rs
@@ -23,7 +23,7 @@ pub struct sockaddr_in {
     pub sin_family: sa_family_t,
     pub sin_port: in_port_t,
     pub sin_addr: in_addr,
-    pub _pad: [c_char; 8],
+    pub sin_zero: [c_char; 8],
 }
 
 #[repr(C)]
@@ -63,3 +63,11 @@ pub const INADDR_UNSPEC_GROUP: u32 = 0xE000_0000;
 pub const INADDR_ALLHOSTS_GROUP: u32 = 0xE000_0001;
 pub const INADDR_ALLRTRS_GROUP: u32 = 0xE000_0002;
 pub const INADDR_MAX_LOCAL_GROUP: u32 = 0xE000_00FF;
+
+pub static in6addr_any: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+};
+
+pub static in6addr_loopback: in6_addr = in6_addr {
+    s6_addr: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]
+};