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#pragma	src	"/sys/src/libip"
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#pragma	lib	"libip.a"
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enum
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{
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	IPaddrlen=	16,
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	IPv4addrlen=	4,
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	IPv4off=	12,
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	IPllen=		4,
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	IPV4HDR_LEN=	20,
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	/* vihl & vcf[0] values */
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	IP_VER4= 	0x40,
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	IP_VER6=	0x60,
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};
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/*
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 *  for reading /net/ipifc
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 */
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typedef struct Ipifc Ipifc;
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typedef struct Iplifc Iplifc;
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typedef struct Ipv6rp Ipv6rp;
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/* local address */
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struct Iplifc
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{
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	Iplifc	*next;
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	/* per address on the ip interface */
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	uchar	ip[IPaddrlen];
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	uchar	mask[IPaddrlen];
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	uchar	net[IPaddrlen];		/* ip & mask */
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	ulong	preflt;			/* preferred lifetime */
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	ulong	validlt;		/* valid lifetime */
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};
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/* default values, one per stack */
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struct Ipv6rp
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{
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	int	mflag;
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	int	oflag;
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	int 	maxraint;
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	int	minraint;
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	int	linkmtu;
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	int	reachtime;
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	int	rxmitra;
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	int	ttl;
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	int	routerlt;
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};
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/* actual interface */
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struct Ipifc
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{
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	Ipifc	*next;
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	Iplifc	*lifc;
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	/* per ip interface */
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	int	index;			/* number of interface in ipifc dir */
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	char	dev[64];
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	uchar	sendra6;		/* on == send router adv */
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	uchar	recvra6;		/* on == rcv router adv */
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	int	mtu;
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	ulong	pktin;
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	ulong	pktout;
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	ulong	errin;
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	ulong	errout;
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	Ipv6rp	rp;
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};
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#define ISIPV6MCAST(addr)	((addr)[0] == 0xff)
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#define ISIPV6LINKLOCAL(addr) ((addr)[0] == 0xfe && ((addr)[1] & 0xc0) == 0x80)
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/*
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 * ipv6 constants
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 * `ra' is `router advertisement', `rs' is `router solicitation'.
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 * `na' is `neighbour advertisement'.
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 */
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enum {
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	IPV6HDR_LEN	= 40,
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	/* neighbour discovery option types */
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	V6nd_srclladdr	= 1,
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	V6nd_targlladdr	= 2,
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	V6nd_pfxinfo	= 3,
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	V6nd_redirhdr	= 4,
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	V6nd_mtu	= 5,
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	/* new since rfc2461; see iana.org/assignments/icmpv6-parameters */
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	V6nd_home	= 8,
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	V6nd_srcaddrs	= 9,		/* rfc3122 */
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	V6nd_ip		= 17,
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	/* /lib/rfc/drafts/draft-jeong-dnsop-ipv6-dns-discovery-12.txt */
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	V6nd_rdns	= 25,
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	/* plan 9 extensions */
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	V6nd_9fs	= 250,
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	V6nd_9auth	= 251,
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	/* Router constants (all times in ms.) */
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	Maxv6initraintvl= 16000,
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	Maxv6initras	= 3,
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	Maxv6finalras	= 3,
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	Minv6interradelay= 3000,
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	Maxv6radelay	= 500,
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	/* Host constants */
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	Maxv6rsdelay	= 1000,
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	V6rsintvl	= 4000,
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	Maxv6rss	= 3,
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	/* Node constants */
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	Maxv6mcastrss	= 3,
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	Maxv6unicastrss	= 3,
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	Maxv6anycastdelay= 1000,
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	Maxv6na		= 3,
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	V6reachabletime	= 30000,
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	V6retranstimer	= 1000,
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	V6initprobedelay= 5000,
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};
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/* V6 header on the wire */
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typedef struct Ip6hdr Ip6hdr;
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struct Ip6hdr {
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	uchar	vcf[4];		/* version:4, traffic class:8, flow label:20 */
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	uchar	ploadlen[2];	/* payload length: packet length - 40 */
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	uchar	proto;		/* next header type */
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	uchar	ttl;		/* hop limit */
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	uchar	src[IPaddrlen];	/* source address */
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	uchar	dst[IPaddrlen];	/* destination address */
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	uchar	payload[];
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};
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/*
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 *  user-level icmpv6 with control message "headers"
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 */
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typedef struct Icmp6hdr Icmp6hdr;
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struct Icmp6hdr {
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	uchar	_0_[8];
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	uchar	laddr[IPaddrlen];	/* local address */
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	uchar	raddr[IPaddrlen];	/* remote address */
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};
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/*
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 *  user level udp headers with control message "headers"
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 */
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enum
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{
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	Udphdrsize=	52,	/* size of a Udphdr */
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};
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typedef struct Udphdr Udphdr;
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struct Udphdr
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{
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	uchar	raddr[IPaddrlen];	/* V6 remote address */
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	uchar	laddr[IPaddrlen];	/* V6 local address */
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	uchar	ifcaddr[IPaddrlen];	/* V6 ifc addr msg was received on */
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	uchar	rport[2];		/* remote port */
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	uchar	lport[2];		/* local port */
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};
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uchar*	defmask(uchar*);
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void	maskip(uchar*, uchar*, uchar*);
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int	eipfmt(Fmt*);
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int	isv4(uchar*);
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vlong	parseip(uchar*, char*);
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vlong	parseipmask(uchar*, char*);
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char*	v4parseip(uchar*, char*);
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char*	v4parsecidr(uchar*, uchar*, char*);
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int	parseether(uchar*, char*);
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int	myipaddr(uchar*, char*);
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int	myetheraddr(uchar*, char*);
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int	equivip4(uchar*, uchar*);
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int	equivip6(uchar*, uchar*);
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Ipifc*	readipifc(char*, Ipifc*, int);
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void	hnputv(void*, uvlong);
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void	hnputl(void*, uint);
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void	hnputs(void*, ushort);
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uvlong	nhgetv(void*);
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uint	nhgetl(void*);
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ushort	nhgets(void*);
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ushort	ptclbsum(uchar*, int);
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int	v6tov4(uchar*, uchar*);
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void	v4tov6(uchar*, uchar*);
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#define	ipcmp(x, y) memcmp(x, y, IPaddrlen)
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#define	ipmove(x, y) memmove(x, y, IPaddrlen)
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extern uchar IPv4bcast[IPaddrlen];
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extern uchar IPv4bcastobs[IPaddrlen];
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extern uchar IPv4allsys[IPaddrlen];
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extern uchar IPv4allrouter[IPaddrlen];
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extern uchar IPnoaddr[IPaddrlen];
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extern uchar v4prefix[IPaddrlen];
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extern uchar IPallbits[IPaddrlen];
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#define CLASS(p) ((*(uchar*)(p))>>6)
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#pragma	varargck	type	"I"	uchar*
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#pragma	varargck	type	"V"	uchar*
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#pragma	varargck	type	"E"	uchar*
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#pragma	varargck	type	"M"	uchar*