--- /dev/null
+/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _NETINET_IP6_H
+#define _NETINET_IP6_H 1
+
+#include <inttypes.h>
+#include <netinet/in.h>
+
+struct ip6_hdr
+ {
+ union
+ {
+ struct ip6_hdrctl
+ {
+ uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
+ 20 bits flow-ID */
+ uint16_t ip6_un1_plen; /* payload length */
+ uint8_t ip6_un1_nxt; /* next header */
+ uint8_t ip6_un1_hlim; /* hop limit */
+ } ip6_un1;
+ uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */
+ } ip6_ctlun;
+ struct in6_addr ip6_src; /* source address */
+ struct in6_addr ip6_dst; /* destination address */
+ };
+
+#define ip6_vfc ip6_ctlun.ip6_un2_vfc
+#define ip6_flow ip6_ctlun.ip6_un1.ip6_un1_flow
+#define ip6_plen ip6_ctlun.ip6_un1.ip6_un1_plen
+#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
+#define ip6_hlim ip6_ctlun.ip6_un1.ip6_un1_hlim
+#define ip6_hops ip6_ctlun.ip6_un1.ip6_un1_hlim
+
+/* Generic extension header. */
+struct ip6_ext
+ {
+ uint8_t ip6e_nxt; /* next header. */
+ uint8_t ip6e_len; /* length in units of 8 octets. */
+ };
+
+/* Hop-by-Hop options header. */
+struct ip6_hbh
+ {
+ uint8_t ip6h_nxt; /* next header. */
+ uint8_t ip6h_len; /* length in units of 8 octets. */
+ /* followed by options */
+ };
+
+/* Destination options header */
+struct ip6_dest
+ {
+ uint8_t ip6d_nxt; /* next header */
+ uint8_t ip6d_len; /* length in units of 8 octets */
+ /* followed by options */
+ };
+
+/* Routing header */
+struct ip6_rthdr
+ {
+ uint8_t ip6r_nxt; /* next header */
+ uint8_t ip6r_len; /* length in units of 8 octets */
+ uint8_t ip6r_type; /* routing type */
+ uint8_t ip6r_segleft; /* segments left */
+ /* followed by routing type specific data */
+ };
+
+/* Type 0 Routing header */
+struct ip6_rthdr0
+ {
+ uint8_t ip6r0_nxt; /* next header */
+ uint8_t ip6r0_len; /* length in units of 8 octets */
+ uint8_t ip6r0_type; /* always zero */
+ uint8_t ip6r0_segleft; /* segments left */
+ uint8_t ip6r0_reserved; /* reserved field */
+ uint8_t ip6r0_slmap[3]; /* strict/loose bit map */
+ /* followed by up to 127 struct in6_addr */
+ struct in6_addr ip6r0_addr[0];
+ };
+
+/* Fragment header */
+struct ip6_frag
+ {
+ uint8_t ip6f_nxt; /* next header */
+ uint8_t ip6f_reserved; /* reserved field */
+ uint16_t ip6f_offlg; /* offset, reserved, and flag */
+ uint32_t ip6f_ident; /* identification */
+ };
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define IP6F_OFF_MASK 0xfff8 /* mask out offset from _offlg */
+# define IP6F_RESERVED_MASK 0x0006 /* reserved bits in ip6f_offlg */
+# define IP6F_MORE_FRAG 0x0001 /* more-fragments flag */
+#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
+# define IP6F_OFF_MASK 0xf8ff /* mask out offset from _offlg */
+# define IP6F_RESERVED_MASK 0x0600 /* reserved bits in ip6f_offlg */
+# define IP6F_MORE_FRAG 0x0100 /* more-fragments flag */
+#endif
+
+/* IPv6 options */
+struct ip6_opt
+ {
+ uint8_t ip6o_type;
+ uint8_t ip6o_len;
+ };
+
+/* The high-order 3 bits of the option type define the behavior
+ * when processing an unknown option and whether or not the option
+ * content changes in flight.
+ */
+#define IP6OPT_TYPE(o) ((o) & 0xc0)
+#define IP6OPT_TYPE_SKIP 0x00
+#define IP6OPT_TYPE_DISCARD 0x40
+#define IP6OPT_TYPE_FORCEICMP 0x80
+#define IP6OPT_TYPE_ICMP 0xc0
+#define IP6OPT_TYPE_MUTABLE 0x20
+
+/* Special option types for padding. */
+#define IP6OPT_PAD1 0
+#define IP6OPT_PADN 1
+
+#define IP6OPT_JUMBO 0xc2
+#define IP6OPT_NSAP_ADDR 0xc3
+#define IP6OPT_TUNNEL_LIMIT 0x04
+#define IP6OPT_ROUTER_ALERT 0x05
+
+/* Jumbo Payload Option */
+struct ip6_opt_jumbo
+ {
+ uint8_t ip6oj_type;
+ uint8_t ip6oj_len;
+ uint8_t ip6oj_jumbo_len[4];
+ };
+#define IP6OPT_JUMBO_LEN 6
+
+/* NSAP Address Option */
+struct ip6_opt_nsap
+ {
+ uint8_t ip6on_type;
+ uint8_t ip6on_len;
+ uint8_t ip6on_src_nsap_len;
+ uint8_t ip6on_dst_nsap_len;
+ /* followed by source NSAP */
+ /* followed by destination NSAP */
+ };
+
+/* Tunnel Limit Option */
+struct ip6_opt_tunnel
+ {
+ uint8_t ip6ot_type;
+ uint8_t ip6ot_len;
+ uint8_t ip6ot_encap_limit;
+ };
+
+/* Router Alert Option */
+struct ip6_opt_router
+ {
+ uint8_t ip6or_type;
+ uint8_t ip6or_len;
+ uint8_t ip6or_value[2];
+ };
+
+/* Router alert values (in network byte order) */
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define IP6_ALERT_MLD 0x0000
+# define IP6_ALERT_RSVP 0x0001
+# define IP6_ALERT_AN 0x0002
+#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
+# define IP6_ALERT_MLD 0x0000
+# define IP6_ALERT_RSVP 0x0100
+# define IP6_ALERT_AN 0x0200
+#endif
+
+#endif /* netinet/ip6.h */
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