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INET6_RTHDR_SPACE(3)     BSD Library Functions Manual     INET6_RTHDR_SPACE(3)

NAME
     inet6_rthdr_space, inet6_rthdr_init, inet6_rthdr_add,
     inet6_rthdr_lasthop, inet6_rthdr_reverse, inet6_rthdr_segments,
     inet6_rthdr_getaddr, inet6_rthdr_getflags -- IPv6 Routing Header Options
     manipulation

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <netinet/in.h>

     size_t
     inet6_rthdr_space(int type, int segments);

     struct cmsghdr *
     inet6_rthdr_init(void *bp, int type);

     int
     inet6_rthdr_add(struct cmsghdr *cmsg, const struct in6_addr *addr,
         unsigned int flags);

     int
     inet6_rthdr_lasthop(struct cmsghdr *cmsg, unsigned int flags);

     int
     inet6_rthdr_reverse(const struct cmsghdr *in, struct cmsghdr *out);

     int
     inet6_rthdr_segments(const struct cmsghdr *cmsg);

     struct in6_addr *
     inet6_rthdr_getaddr(struct cmsghdr *cmsg, int index);

     int
     inet6_rthdr_getflags(const struct cmsghdr *cmsg, int index);

DESCRIPTION
     RFC2292 IPv6 advanced API defines eight functions that the application
     calls to build and examine a Routing header.  Four functions build a
     Routing header:

     inet6_rthdr_space() return #bytes required for ancillary data

     inet6_rthdr_init() initialize ancillary data for Routing header

     inet6_rthdr_add() add IPv6 address & flags to Routing header

     inet6_rthdr_lasthop() specify the flags for the final hop

     Four functions deal with a returned Routing header:

     inet6_rthdr_reverse() reverse a Routing header

     inet6_rthdr_segments() return #segments in a Routing header

     inet6_rthdr_getaddr() fetch one address from a Routing header

     inet6_rthdr_getflags() fetch one flag from a Routing header

     The function prototypes for these functions are all in the <netinet/in.h>
     header.

     The full description of these functions is available in RFC2292.

DIAGNOSTICS
     inet6_rthdr_space() returns 0 on errors.

     inet6_rthdr_add(), inet6_rthdr_lasthop() and inet6_rthdr_reverse() return
     0 on success, and returns -1 on error.

     inet6_rthdr_init() and inet6_rthdr_getaddr() return NULL on error.

     inet6_rthdr_segments() and inet6_rthdr_getflags() return -1 on error.

EXAMPLES
     RFC2292 gives comprehensive examples in chapter 8.

SEE ALSO
     W. Stevens and M. Thomas, Advanced Sockets API for IPv6, RFC2292,
     February 1998.

     S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6)
     Specification, RFC2460, December 1998.

HISTORY
     The implementation first appeared in KAME advanced networking kit.

STANDARDS
     The functions are documented in ``Advanced Sockets API for IPv6''
     (RFC2292).

BUGS
     The text was shamelessly copied from RFC2292.

     inet6_rthdr_reverse() is not implemented yet.

BSD                            December 10, 1999                           BSD