Determine the space required by an IPv6 routing header
#include <netinet/in.h> size_t inet6_rthdr_space(int type, int segments);
- The type of IPv6 Routing header (e.g. Type 0 as defined in <netinet/in.h>).
- The number of segments (addresses) in the Routing header.
Use the -l socket option to qcc to link against this library.
This function returns the number of bytes required to hold a Routing header of the specified type containing a specified number of segments (addresses). For an IPv6 Type 0 Routing header, the number of segments must be between 1 and 23, inclusive. The return value includes the size of the cmsghdr structure that precedes the Routing header, and any required padding.
- W. Stevens and M. Thomas, Advanced Sockets API for IPv6, RFC 2292, February 1998. Contains good examples.
- S. Deering and R. Hinden, Internet Protocol, Version 6 (IPv6) Specification, RFC 2460, December 1998.
0, for either of the two situations: the type of the routing header isn't supported by this implementation or the number of segments is invalid for this type of routing header.