
238 RFC3542 "Advanced Sockets API for IPv6"
RFC 3542
Advanced Sockets API for IPv6
May 2003
4. Access to the optional Routing header, Hop-by-Hop options, and
Destination options extension headers.
5. Additional features required for improved IPv6 application
portability.
The packet information along with access to the extension headers
(Routing header, Hop-by-Hop options, and Destination options) are
specified using the ~ancillary data" fields that were added to the
4.3BSD Reno sockets API in 1990. The reason is that these ancillary
data fields are part of the Posix standard ...