auto import from //depot/cupcake/@135843
diff --git a/libc/include/netinet/in6.h b/libc/include/netinet/in6.h
new file mode 100644
index 0000000..e645c48
--- /dev/null
+++ b/libc/include/netinet/in6.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _NETINET_IN6_H
+#define _NETINET_IN6_H
+
+#include <linux/in6.h>
+
+#define IN6_IS_ADDR_UNSPECIFIED(a) \
+ ((*(const uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[12]) == 0))
+
+#define IN6_IS_ADDR_LOOPBACK(a) \
+ ((*(const uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[12]) == ntohl(1)))
+
+#define IN6_IS_ADDR_V4COMPAT(a) \
+ ((*(const uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[8]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[12]) != 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[12]) != ntohl(1)))
+
+#define IN6_IS_ADDR_V4MAPPED(a) \
+ ((*(const uint32_t *)(const void *)(&(a)->s6_addr[0]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[4]) == 0) && \
+ (*(const uint32_t *)(const void *)(&(a)->s6_addr[8]) == ntohl(0x0000ffff)))
+
+#define IN6_IS_ADDR_LINKLOCAL(a) \
+ (((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0x80))
+
+#define IN6_IS_ADDR_SITELOCAL(a) \
+ (((a)->s6_addr[0] == 0xfe) && (((a)->s6_addr[1] & 0xc0) == 0xc0))
+
+#define IN6_IS_ADDR_MULTICAST(a) \
+ (((__const uint8_t *) (a))[0] == 0xff)
+
+
+#define IPV6_ADDR_SCOPE_NODELOCAL 0x01
+#define IPV6_ADDR_SCOPE_INTFACELOCAL 0x01
+#define IPV6_ADDR_SCOPE_LINKLOCAL 0x02
+#define IPV6_ADDR_SCOPE_SITELOCAL 0x05
+#define IPV6_ADDR_SCOPE_ORGLOCAL 0x08
+#define IPV6_ADDR_SCOPE_GLOBAL 0x0e
+
+#define IPV6_ADDR_MC_SCOPE(a) \
+ ((a)->s6_addr[1] & 0x0f)
+
+#define IN6_IS_ADDR_MC_LINKLOCAL(a) \
+ (IN6_IS_ADDR_MULTICAST(a) && \
+ (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_LINKLOCAL))
+#define IN6_IS_ADDR_MC_SITELOCAL(a) \
+ (IN6_IS_ADDR_MULTICAST(a) && \
+ (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_SITELOCAL))
+#define IN6_IS_ADDR_MC_ORGLOCAL(a) \
+ (IN6_IS_ADDR_MULTICAST(a) && \
+ (IPV6_ADDR_MC_SCOPE(a) == IPV6_ADDR_SCOPE_ORGLOCAL))
+
+
+#define IN6_ARE_ADDR_EQUAL(a, b) \
+ (memcmp(&(a)->s6_addr[0], &(b)->s6_addr[0], sizeof(struct in6_addr)) == 0)
+
+#define INET6_ADDRSTRLEN 46
+
+#endif /* _NETINET_IN6_H */