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INET6_RTH_SPACE(3) BSD Library Functions Manual INET6_RTH_SPACE(3)NAME
inet6_rth_space, inet6_rth_init, inet6_rth_add, inet6_rth_reverse, inet6_rth_segments, inet6_rth_getaddr -- IPv6 Routing Header Options
manipulation
SYNOPSIS
#include <netinet/in.h>
socklen_t
inet6_rth_space(int, int);
void *
inet6_rth_init(void *, socklen_t, int, int);
int
inet6_rth_add(void *, const struct in6_addr *);
int
inet6_rth_reverse(const void *, void *);
int
inet6_rth_segments(const void *);
struct in6_addr *
inet6_rth_getaddr(const void *, int);
DESCRIPTION
The IPv6 Advanced API, RFC 3542, defines the functions that an application calls to build and examine IPv6 Routing headers. Routing headers
are used to perform source routing in IPv6 networks. The RFC uses the word ``segments'' to describe addresses and that is the term used here
as well. All of the functions are defined in the <netinet/in.h> header file. The functions described in this manual page all operate on
routing header structures which are defined in <netinet/ip6.h> but which should not need to be modified outside the use of this API. The
size and shape of the route header structures may change, so using the APIs is a more portable, long term, solution.
The functions in the API are split into two groups, those that build a routing header and those that parse a received routing header. We
will describe the builder functions followed by the parser functions.
inet6_rth_space
The inet6_rth_space() function returns the number of bytes required to hold a Routing Header of the type, specified in the type argument and
containing the number of addresses specified in the segments argument. When the type is IPV6_RTHDR_TYPE_0 the number of segments must be
from 0 through 127. Routing headers of type IPV6_RTHDR_TYPE_2 contain only one segment, and are only used with Mobile IPv6. The return
value from this function is the number of bytes required to store the routing header. If the value 0 is returned then either the route
header type was not recognized or another error occurred.
inet6_rth_init
The inet6_rth_init() function initializes the pre-allocated buffer pointed to by bp to contain a routing header of the specified type. The
bp_len argument is used to verify that the buffer is large enough. The caller must allocate the buffer pointed to by bp. The necessary buf-
fer size should be determined by calling inet6_rth_space() described in the previous sections.
The inet6_rth_init() function returns a pointer to bp on success and NULL when there is an error.
inet6_rth_add
The inet6_rth_add() function adds the IPv6 address pointed to by addr to the end of the routing header being constructed.
A successful addition results in the function returning 0, otherwise -1 is returned.
inet6_rth_reverse
The inet6_rth_reverse() function takes a routing header, pointed to by the argument in, and writes a new routing header into the argument
pointed to by out. The routing header at that sends datagrams along the reverse of that route. Both arguments are allowed to point to the
same buffer meaning that the reversal can occur in place.
The return value of the function is 0 on success, or -1 when there is an error.
The next set of functions operate on a routing header that the application wants to parse. In the usual case such a routing header is
received from the network, although these functions can also be used with routing headers that the application itself created.
inet6_rth_segments
The inet6_rth_segments() function returns the number of segments contained in the routing header pointed to by bp. The return value is the
number of segments contained in the routing header, or -1 if an error occurred. It is not an error for 0 to be returned as a routing header
may contain 0 segments.
inet6_rth_getaddr
The inet6_rth_getaddr() function is used to retrieve a single address from a routing header. The index is the location in the routing header
from which the application wants to retrieve an address. The index parameter must have a value between 0 and one less than the number of
segments present in the routing header. The inet6_rth_segments() function, described in the last section, should be used to determine the
total number of segments in the routing header. The inet6_rth_getaddr() function returns a pointer to an IPv6 address on success or NULL
when an error has occurred.
EXAMPLES
RFC 3542 gives extensive examples in Section 21, Appendix B.
KAME also provides examples in the advapitest directory of its kit.
DIAGNOSTICS
The inet6_rth_space() and inet6_rth_getaddr() functions return 0 on errors.
The inet6_rthdr_init() function returns NULL on error. The inet6_rth_add() and inet6_rth_reverse() functions return 0 on success, or -1 upon
an error.
SEE ALSO
W. Stevens, M. Thomas, E. Nordmark, and T. Jinmei, Advanced Sockets API for IPv6, RFC 3542, May 2003.
S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6) Specification, RFC2460, December 1998.
HISTORY
The implementation first appeared in KAME advanced networking kit.
BSD December 24, 2004 BSD
IPv6 Routing got flushed out in RHEL6.4