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/*
 * Internet Protocol Version 6
 *
 * rfc2460 defines the protocol, rfc2461 neighbour discovery, and
 * rfc2462 address autoconfiguration.  rfc4443 defines ICMP; was rfc2463.
 * rfc4291 defines the address architecture (including prefices), was rfc3513.
 * rfc4007 defines the scoped address architecture.
 *
 * global unicast is anything but unspecified (::), loopback (::1),
 * multicast (ff00::/8), and link-local unicast (fe80::/10).
 *
 * site-local (fec0::/10) is now deprecated, originally by rfc3879.
 *
 * Unique Local IPv6 Unicast Addresses are defined by rfc4193.
 * prefix is fc00::/7, scope is global, routing is limited to roughly a site.
 */
#define isv6mcast(addr)   ((addr)[0] == 0xff)
#define islinklocal(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)

#define optexsts(np)    (nhgets((np)->ploadlen) > 24)
#define issmcast(addr)  (memcmp((addr), v6solicitednode, 13) == 0)

enum {                          /* Header Types */
        HBH             = 0,    /* hop-by-hop multicast routing protocol */
        ICMP            = 1,
        IGMP            = 2,
        GGP             = 3,
        IPINIP          = 4,
        ST              = 5,
        TCP             = 6,
        UDP             = 17,
        ISO_TP4         = 29,
        RH              = 43,
        FH              = 44,
        IDRP            = 45,
        RSVP            = 46,
        AH              = 51,
        ESP             = 52,
        ICMPv6          = 58,
        NNH             = 59,
        DOH             = 60,
        ISO_IP          = 80,
        IGRP            = 88,
        OSPF            = 89,

        Maxhdrtype      = 256,
};

enum {
        /* multicast flags and scopes */

//      Well_known_flg  = 0,
//      Transient_flg   = 1,

//      Interface_local_scop = 1,
        Link_local_scop = 2,
//      Site_local_scop = 5,
//      Org_local_scop  = 8,
        Global_scop     = 14,

        /* various prefix lengths */
        SOLN_PREF_LEN   = 13,

        /* icmpv6 unreachability codes */
        Icmp6_no_route          = 0,
        Icmp6_ad_prohib         = 1,
        Icmp6_out_src_scope     = 2,
        Icmp6_adr_unreach       = 3,
        Icmp6_port_unreach      = 4,
        Icmp6_gress_src_fail    = 5,
        Icmp6_rej_route         = 6,
        Icmp6_unknown           = 7,  /* our own invention for internal use */

        /* various flags & constants */
        v6MINTU         = 1280,
        HOP_LIMIT       = 255,
        IP6HDR          = 40,           /* sizeof(Ip6hdr) = 8 + 2*16 */

        /* option types */

        /* neighbour discovery */
        SRC_LLADDR      = 1,
        TARGET_LLADDR   = 2,
        PREFIX_INFO     = 3,
        REDIR_HEADER    = 4,
        MTU_OPTION      = 5,
        /* new since rfc2461; see iana.org/assignments/icmpv6-parameters */
        V6nd_home       = 8,
        V6nd_srcaddrs   = 9,            /* rfc3122 */
        V6nd_ip         = 17,
        /* /lib/rfc/drafts/draft-jeong-dnsop-ipv6-dns-discovery-12.txt */
        V6nd_rdns       = 25,
        /* plan 9 extensions */
        V6nd_9fs        = 250,
        V6nd_9auth      = 251,

        SRC_UNSPEC      = 0,
        SRC_UNI         = 1,
        TARG_UNI        = 2,
        TARG_MULTI      = 3,

        Tunitent        = 1,
        Tuniproxy       = 2,
        Tunirany        = 3,

        /* Node constants */
        MAX_MULTICAST_SOLICIT   = 3,
        RETRANS_TIMER           = 1000,
};

typedef struct Ip6hdr   Ip6hdr;
typedef struct Opthdr   Opthdr;
typedef struct Routinghdr Routinghdr;
typedef struct Fraghdr6 Fraghdr6;

/* we do this in case there's padding at the end of Ip6hdr */
#define IPV6HDR \
        uchar   vcf[4];         /* version:4, traffic class:8, flow label:20 */\
        uchar   ploadlen[2];    /* payload length: packet length - 40 */ \
        uchar   proto;          /* next header type */ \
        uchar   ttl;            /* hop limit */ \
        uchar   src[IPaddrlen]; \
        uchar   dst[IPaddrlen]

struct  Ip6hdr {
        IPV6HDR;
        uchar   payload[];
};

struct  Opthdr {                /* unused */
        uchar   nexthdr;
        uchar   len;
};

/*
 * Beware routing header type 0 (loose source routing); see
 * http://www.secdev.org/conf/IPv6_RH_security-csw07.pdf.
 * Type 1 is unused.  Type 2 is for MIPv6 (mobile IPv6) filtering
 * against type 0 header.
 */
struct  Routinghdr {            /* unused */
        uchar   nexthdr;
        uchar   len;
        uchar   rtetype;
        uchar   segrem;
};

struct  Fraghdr6 {
        uchar   nexthdr;
        uchar   res;
        uchar   offsetRM[2];    /* Offset, Res, M flag */
        uchar   id[4];
};

extern uchar v6allnodesN[IPaddrlen];
extern uchar v6allnodesL[IPaddrlen];
extern uchar v6allroutersN[IPaddrlen];
extern uchar v6allroutersL[IPaddrlen];
extern uchar v6allnodesNmask[IPaddrlen];
extern uchar v6allnodesLmask[IPaddrlen];
extern uchar v6solicitednode[IPaddrlen];
extern uchar v6solicitednodemask[IPaddrlen];
extern uchar v6Unspecified[IPaddrlen];
extern uchar v6loopback[IPaddrlen];
extern uchar v6loopbackmask[IPaddrlen];
extern uchar v6linklocal[IPaddrlen];
extern uchar v6linklocalmask[IPaddrlen];
extern uchar v6multicast[IPaddrlen];
extern uchar v6multicastmask[IPaddrlen];

extern int v6llpreflen;
extern int v6mcpreflen;
extern int v6snpreflen;
extern int v6aNpreflen;
extern int v6aLpreflen;

extern int ReTransTimer;

void ipv62smcast(uchar *, uchar *);
void icmpns(Fs *f, uchar* src, int suni, uchar* targ, int tuni, uchar* mac);
void icmpna(Fs *f, uchar* src, uchar* dst, uchar* targ, uchar* mac, uchar flags);
void icmpttlexceeded6(Fs *f, Ipifc *ifc, Block *bp);
void icmppkttoobig6(Fs *f, Ipifc *ifc, Block *bp);
void icmphostunr(Fs *f, Ipifc *ifc, Block *bp, int code, int free);