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#pragma src     "/sys/src/libip"
#pragma lib     "libip.a"

enum 
{
        IPaddrlen=      16,
        IPv4addrlen=    4,
        IPv4off=        12,
        IPllen=         4,
        IPV4HDR_LEN=    20,

        /* vihl & vcf[0] values */
        IP_VER4=        0x40,
        IP_VER6=        0x60,
};

/*
 *  for reading /net/ipifc
 */
typedef struct Ipifc Ipifc;
typedef struct Iplifc Iplifc;
typedef struct Ipv6rp Ipv6rp;

/* local address */
struct Iplifc
{
        Iplifc  *next;

        /* per address on the ip interface */
        uchar   ip[IPaddrlen];
        uchar   mask[IPaddrlen];
        uchar   net[IPaddrlen];         /* ip & mask */
        ulong   preflt;                 /* preferred lifetime */
        ulong   validlt;                /* valid lifetime */
};

/* default values, one per stack */
struct Ipv6rp
{
        int     mflag;
        int     oflag;
        int     maxraint;
        int     minraint;
        int     linkmtu;
        int     reachtime;
        int     rxmitra;
        int     ttl;
        int     routerlt;       
};

/* actual interface */
struct Ipifc
{
        Ipifc   *next;
        Iplifc  *lifc;

        /* per ip interface */
        int     index;                  /* number of interface in ipifc dir */
        char    dev[64];
        uchar   sendra6;                /* on == send router adv */
        uchar   recvra6;                /* on == rcv router adv */
        int     mtu;
        ulong   pktin;
        ulong   pktout;
        ulong   errin;
        ulong   errout;
        Ipv6rp  rp;
};

#define ISIPV6MCAST(addr)       ((addr)[0] == 0xff)
#define ISIPV6LINKLOCAL(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)

/*
 * ipv6 constants
 * `ra' is `router advertisement', `rs' is `router solicitation'.
 * `na' is `neighbour advertisement'.
 */
enum {
        IPV6HDR_LEN     = 40,

        /* neighbour discovery option types */
        V6nd_srclladdr  = 1,
        V6nd_targlladdr = 2,
        V6nd_pfxinfo    = 3,
        V6nd_redirhdr   = 4,
        V6nd_mtu        = 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,

        /* Router constants (all times in ms.) */
        Maxv6initraintvl= 16000,
        Maxv6initras    = 3,
        Maxv6finalras   = 3,
        Minv6interradelay= 3000,
        Maxv6radelay    = 500,

        /* Host constants */
        Maxv6rsdelay    = 1000,
        V6rsintvl       = 4000,
        Maxv6rss        = 3,

        /* Node constants */
        Maxv6mcastrss   = 3,
        Maxv6unicastrss = 3,
        Maxv6anycastdelay= 1000,
        Maxv6na         = 3,
        V6reachabletime = 30000,
        V6retranstimer  = 1000,
        V6initprobedelay= 5000,
};

/* V6 header on the wire */
typedef struct Ip6hdr Ip6hdr;
struct Ip6hdr {
        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]; /* source address */
        uchar   dst[IPaddrlen]; /* destination address */
        uchar   payload[];
};

/*
 *  user-level icmpv6 with control message "headers"
 */
typedef struct Icmp6hdr Icmp6hdr;
struct Icmp6hdr {
        uchar   _0_[8];
        uchar   laddr[IPaddrlen];       /* local address */
        uchar   raddr[IPaddrlen];       /* remote address */
};

/*
 *  user level udp headers with control message "headers"
 */
enum 
{
        Udphdrsize=     52,     /* size of a Udphdr */
};

typedef struct Udphdr Udphdr;
struct Udphdr
{
        uchar   raddr[IPaddrlen];       /* V6 remote address */
        uchar   laddr[IPaddrlen];       /* V6 local address */
        uchar   ifcaddr[IPaddrlen];     /* V6 ifc addr msg was received on */
        uchar   rport[2];               /* remote port */
        uchar   lport[2];               /* local port */
};

uchar*  defmask(uchar*);
void    maskip(uchar*, uchar*, uchar*);
int     eipfmt(Fmt*);
int     isv4(uchar*);
vlong   parseip(uchar*, char*);
vlong   parseipmask(uchar*, char*);
char*   v4parseip(uchar*, char*);
char*   v4parsecidr(uchar*, uchar*, char*);
int     parseether(uchar*, char*);
int     myipaddr(uchar*, char*);
int     myetheraddr(uchar*, char*);
int     equivip4(uchar*, uchar*);
int     equivip6(uchar*, uchar*);

Ipifc*  readipifc(char*, Ipifc*, int);

void    hnputv(void*, uvlong);
void    hnputl(void*, uint);
void    hnputs(void*, ushort);
uvlong  nhgetv(void*);
uint    nhgetl(void*);
ushort  nhgets(void*);
ushort  ptclbsum(uchar*, int);

int     v6tov4(uchar*, uchar*);
void    v4tov6(uchar*, uchar*);

#define ipcmp(x, y) memcmp(x, y, IPaddrlen)
#define ipmove(x, y) memmove(x, y, IPaddrlen)

extern uchar IPv4bcast[IPaddrlen];
extern uchar IPv4bcastobs[IPaddrlen];
extern uchar IPv4allsys[IPaddrlen];
extern uchar IPv4allrouter[IPaddrlen];
extern uchar IPnoaddr[IPaddrlen];
extern uchar v4prefix[IPaddrlen];
extern uchar IPallbits[IPaddrlen];

#define CLASS(p) ((*(uchar*)(p))>>6)

#pragma varargck        type    "I"     uchar*
#pragma varargck        type    "V"     uchar*
#pragma varargck        type    "E"     uchar*
#pragma varargck        type    "M"     uchar*