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IP(3)			   Library Functions Manual			 IP(3)

       eipfmt,	parseip, parseipmask, v4parseip, v4parsecidr, parseether, myi-
       paddr, myetheraddr, maskip, equivip,  defmask,  isv4,  v4tov6,  v6tov4,
       nhgetl,	nhgets,	 nhgetv, hnputl, hnputs, hnputv, ptclbsum, readipifc -
       Internet	protocol

       #include	<u.h>
       #include	<libc.h>
       #include	<ip.h>

       int  eipfmt(Fmt*)

       ulong	 parseip(uchar *ipaddr,	char *str)

       ulong	 parseipmask(uchar *ipaddr, char *str)

       char*	 v4parseip(uchar *ipaddr, char *str)

       ulong	 v4parsecidr(uchar *addr, uchar	*mask, char *str)

       int  parseether(uchar *eaddr, char *str)

       int  myetheraddr(uchar *eaddr, char *dev)

       int  myipaddr(uchar *ipaddr, char *net)

       void maskip(uchar *from,	uchar *mask, uchar *to)

       int  equivip(uchar *ipaddr1, uchar *ipaddr2)

       uchar*	 defmask(uchar *ipaddr)

       int  isv4(uchar *ipaddr)

       void v4tov6(uchar *ipv6,	uchar *ipv4)

       void v6tov4(uchar *ipv4,	uchar *ipv6)

       ushort	 nhgets(void *p)

       uint nhgetl(void	*p)

       uvlong	 nhgetv(void *p)

       void hnputs(void	*p, ushort v)

       void hnputl(void	*p, uint v)

       void hnputv(void	*p, uvlong v)

       ushort	 ptclbsum(uchar	*a, int	n)

       Ipifc*	 readipifc(char	*net, Ipifc *ifc, int index)

       uchar	 IPv4bcast[IPaddrlen];

       uchar	 IPv4allsys[IPaddrlen];

       uchar	 IPv4allrouter[IPaddrlen];

       uchar	 IPallbits[IPaddrlen];

       uchar	 IPnoaddr[IPaddrlen];

       uchar	 v4prefix[IPaddrlen];

       These routines are used by Internet Protocol (IP) programs  to  manipu-
       late  IP	and Ethernet addresses.	 Plan 9, by default, uses V6 format IP
       addresses.  Since V4 addresses fit into the V6 space, all IP  addresses
       can be represented.  IP addresses are stored as a string	of 16 unsigned
       chars, Ethernet addresses as 6 unsigned chars.  Either V4 or V6	string
       representation  can  be	used  for IP addresses.	 For V4	addresses, the
       representation can be (up to) 4 decimal integers	from 0	to  255	 sepa-
       rated  by  periods.   For V6 addresses, the representation is (up to) 8
       hex integers from 0x0 to	0xFFFF separated by colons.  Strings of	0  in-
       tegers  can  be	elided	using  two colons.  For	example, FFFF::1111 is
       equivalent to FFFF:0:0:0:0:0:0:1111.  The string	representation for  IP
       masks  is  a superset of	the address representation.  It	includes slash
       notation	that indicates the number of  leading  1  bits	in  the	 mask.
       Thus,	a    V4	   class    C	 mask	 can	be    represented   as
       FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FF00,, or  /120.   The
       string  representation  of Ethernet addresses is	exactly	12 hexadecimal

       Eipfmt is a formatter for Ethernet (verb	E) addresses, IP V6  (verb  I)
       addresses, IP V4	(verb V) addresses, and	IP V6 (verb M) masks.

       Parseip	converts  a  string  pointed to	by str to a 16-byte IP address
       starting	at ipaddr.  As a concession to backwards compatibility,	if the
       string  is  a  V4 address, the return value is an unsigned long integer
       containing the big-endian V4 address.  If not, the return value	is  6.
       Parseipmask  converts  a	 string	 pointed to by str to a	6-byte IP mask
       starting	at ipaddr.  It too returns an unsigned long big-endian V4  ad-
       dress or	6.  Both routines return -1 on errors.

       V4parseip converts a string pointed to by str to	a 4-byte V4 IP address
       starting	at ipaddr.

       V4parsecidr converts a string of	the form addr/mask, pointed to by str,
       to  a  4-byte  V4 IP address starting at	ipaddr and a 4-byte V4 IP mask
       starting	at mask.

       Myipaddr	returns	the first valid	IP address in the IP stack  rooted  at

       Parseether converts a string pointed to by str to a 6-byte Ethernet ad-
       dress starting at eaddr.	 Myetheraddr reads the Ethernet	address	string
       from file dev/1/stats and parses	it into	eaddr.	Both routines return a
       negative	number on errors.

       Maskip places the bit-wise AND of the IP	addresses pointed  to  by  its
       first two arguments into	the buffer pointed to by the third.

       Equivip	returns	non-zero if the	IP addresses pointed to	by its two ar-
       guments are equal.

       Defmask returns the standard class A, B,	or C mask for ipaddr.

       Isv4 returns non-zero if	the V6 address is in the V4 space, that	is, if
       it starts with 0:0:0:0:0:0:FFFF.	 V4tov6	converts the V4	address, v4ip,
       to a V6 address and puts	the result in v6ip.  V6tov4  converts  the  V6
       address,	v6ip, to a V4 address and puts the result in v4ip.

       Hnputs, hnputl, and hnputv are used to store 16-, 32-, and 64-bit inte-
       gers into IP big-endian form.  Nhgets, nhgetl, and nhgetv convert  big-
       endian 2-, 4-, and 8-byte quantities into integers.

       Pctlbsum	 returns  the  one's complement	checksum used in IP protocols,
       typically invoked as
       hnputs(hdr->cksum, ~ptclbsum(data, len) & 0xffff);

       A number	of standard IP addresses in V6 format are also defined.	  They

	      the V4 broadcast address

	      the V4 all systems multicast address

	      the V4 all routers multicast address

	      the V6 all bits on address

	      the V6 null address, all zeros

	      the IP V6	prefix to all embedded V4 addresses

       Readipifc  returns  information about a particular interface  (index >=
       0) or all IP interfaces (index <	0) configured under a mount point net,
       default /net.  Each interface is	described by one Ipifc structure which
       in turn points to a linked list of Iplifc structures describing the ad-
       dresses	assigned to this interface.  If	the list ifc is	supplied, that
       list is freed.  Thus, subsequent	calls can be used to free the list re-
       turned by the previous call.  Ipifc is:

       typedef struct Ipifc
	    Ipifc     *next;
	    Iplifc    *lifc;	     /*	local addressses */

	    /* per ip interface	*/
	    int	 index;		/* number of interface in ipifc	dir */
	    char dev[64];  /* associated physical device */
	    int	 mtu;	   /* max transfer unit	*/

	    long validlt;  /* valid life time */
	    long preflt;	/* preferred life time */
	    uchar     sendra6;	/* on == send router adv */
	    uchar     recvra6;	/* on == rcv router adv	*/

	    ulong     pktin;	     /*	packets	read */
	    ulong     pktout;	     /*	packets	written	*/
	    ulong     errin;	     /*	read errors */
	    ulong     errout;	     /*	write errors */
	    Ipv6rp    rp;	/* route advertisement params */
       } Ipifc;

       Iplifc is:

       struct Iplifc
	    Iplifc    *next;

	    uchar     ip[IPaddrlen];
	    uchar     mask[IPaddrlen];
	    uchar     net[IPaddrlen];	       /* ip & mask */
	    ulong     preflt;		  /* preferred lifetime	*/
	    ulong     validlt;	     /*	valid lifetime */

       Ipv6rp  is:  struct Ipv6rp {	 int  mflag;	  int  oflag;	   int
	maxraint; /* max route	adv  interval  */	int  minraint; /*  min
       route   adv   interval	*/	  int  linkmtu;	       int  reachtime;
	    int	 rxmitra;      int  ttl;      int  routerlt;  };

       Dev contains the	first 64 bytes of the device configured	with this  in-
       terface.	 Net is	ip&mask	if the network is multipoint or	the remote ad-
       dress if	the network is point to	point.




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