/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_IPV6_H
#define _UAPI_IPV6_H

#include <linux/libc-compat.h>
#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/in6.h>
#include <asm/byteorder.h>

/* The latest drafts declared increase in minimal mtu up to 1280. */

#define IPV6_MIN_MTU    1280

/*
 *      Advanced API
 *      source interface/address selection, source routing, etc...
 *      *under construction*
 */

#if __UAPI_DEF_IN6_PKTINFO
struct in6_pktinfo {
        struct in6_addr ipi6_addr;
        int             ipi6_ifindex;
};
#endif

#if __UAPI_DEF_IP6_MTUINFO
struct ip6_mtuinfo {
        struct sockaddr_in6     ip6m_addr;
        __u32                   ip6m_mtu;
};
#endif

struct in6_ifreq {
        struct in6_addr ifr6_addr;
        __u32           ifr6_prefixlen;
        int             ifr6_ifindex; 
};

#define IPV6_SRCRT_STRICT       0x01    /* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_0       0       /* Deprecated; will be removed */
#define IPV6_SRCRT_TYPE_2       2       /* IPv6 type 2 Routing Header   */
#define IPV6_SRCRT_TYPE_3       3       /* RPL Segment Routing with IPv6 */
#define IPV6_SRCRT_TYPE_4       4       /* Segment Routing with IPv6 */

/*
 *      routing header
 */
struct ipv6_rt_hdr {
        __u8            nexthdr;
        __u8            hdrlen;
        __u8            type;
        __u8            segments_left;

        /*
         *      type specific data
         *      variable length field
         */
};


struct ipv6_opt_hdr {
        __u8            nexthdr;
        __u8            hdrlen;
        /* 
         * TLV encoded option data follows.
         */
} __attribute__((packed));      /* required for some archs */

#define ipv6_destopt_hdr ipv6_opt_hdr
#define ipv6_hopopt_hdr  ipv6_opt_hdr

/* Router Alert option values (RFC2711) */
#define IPV6_OPT_ROUTERALERT_MLD        0x0000  /* MLD(RFC2710) */

/*
 *      routing header type 0 (used in cmsghdr struct)
 */

struct rt0_hdr {
        struct ipv6_rt_hdr      rt_hdr;
        __u32                   reserved;
        struct in6_addr         addr[];

#define rt0_type                rt_hdr.type
};

/*
 *      routing header type 2
 */

struct rt2_hdr {
        struct ipv6_rt_hdr      rt_hdr;
        __u32                   reserved;
        struct in6_addr         addr;

#define rt2_type                rt_hdr.type
};

/*
 *      home address option in destination options header
 */

struct ipv6_destopt_hao {
        __u8                    type;
        __u8                    length;
        struct in6_addr         addr;
} __attribute__((packed));

/*
 *      IPv6 fixed header
 *
 *      BEWARE, it is incorrect. The first 4 bits of flow_lbl
 *      are glued to priority now, forming "class".
 */

struct ipv6hdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        __u8                    priority:4,
                                version:4;
#elif defined(__BIG_ENDIAN_BITFIELD)
        __u8                    version:4,
                                priority:4;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
        __u8                    flow_lbl[3];

        __be16                  payload_len;
        __u8                    nexthdr;
        __u8                    hop_limit;

        __struct_group(/* no tag */, addrs, /* no attrs */,
                struct  in6_addr        saddr;
                struct  in6_addr        daddr;
        );
};


/* index values for the variables in ipv6_devconf */
enum {
        DEVCONF_FORWARDING = 0,
        DEVCONF_HOPLIMIT,
        DEVCONF_MTU6,
        DEVCONF_ACCEPT_RA,
        DEVCONF_ACCEPT_REDIRECTS,
        DEVCONF_AUTOCONF,
        DEVCONF_DAD_TRANSMITS,
        DEVCONF_RTR_SOLICITS,
        DEVCONF_RTR_SOLICIT_INTERVAL,
        DEVCONF_RTR_SOLICIT_DELAY,
        DEVCONF_USE_TEMPADDR,
        DEVCONF_TEMP_VALID_LFT,
        DEVCONF_TEMP_PREFERED_LFT,
        DEVCONF_REGEN_MAX_RETRY,
        DEVCONF_MAX_DESYNC_FACTOR,
        DEVCONF_MAX_ADDRESSES,
        DEVCONF_FORCE_MLD_VERSION,
        DEVCONF_ACCEPT_RA_DEFRTR,
        DEVCONF_ACCEPT_RA_PINFO,
        DEVCONF_ACCEPT_RA_RTR_PREF,
        DEVCONF_RTR_PROBE_INTERVAL,
        DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
        DEVCONF_PROXY_NDP,
        DEVCONF_OPTIMISTIC_DAD,
        DEVCONF_ACCEPT_SOURCE_ROUTE,
        DEVCONF_MC_FORWARDING,
        DEVCONF_DISABLE_IPV6,
        DEVCONF_ACCEPT_DAD,
        DEVCONF_FORCE_TLLAO,
        DEVCONF_NDISC_NOTIFY,
        DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
        DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
        DEVCONF_SUPPRESS_FRAG_NDISC,
        DEVCONF_ACCEPT_RA_FROM_LOCAL,
        DEVCONF_USE_OPTIMISTIC,
        DEVCONF_ACCEPT_RA_MTU,
        DEVCONF_STABLE_SECRET,
        DEVCONF_USE_OIF_ADDRS_ONLY,
        DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
        DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
        DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
        DEVCONF_DROP_UNSOLICITED_NA,
        DEVCONF_KEEP_ADDR_ON_DOWN,
        DEVCONF_RTR_SOLICIT_MAX_INTERVAL,
        DEVCONF_SEG6_ENABLED,
        DEVCONF_SEG6_REQUIRE_HMAC,
        DEVCONF_ENHANCED_DAD,
        DEVCONF_ADDR_GEN_MODE,
        DEVCONF_DISABLE_POLICY,
        DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN,
        DEVCONF_NDISC_TCLASS,
        DEVCONF_RPL_SEG_ENABLED,
        DEVCONF_RA_DEFRTR_METRIC,
        DEVCONF_IOAM6_ENABLED,
        DEVCONF_IOAM6_ID,
        DEVCONF_IOAM6_ID_WIDE,
        DEVCONF_NDISC_EVICT_NOCARRIER,
        DEVCONF_ACCEPT_UNTRACKED_NA,
        DEVCONF_ACCEPT_RA_MIN_LFT,
        DEVCONF_FORCE_FORWARDING,
        DEVCONF_MAX
};


#endif /* _UAPI_IPV6_H */