Advanced socket APIs

This topic describes the advanced socket APIs and includes the following topics:

Before using advanced socket APIs in a multilevel security environment, see z/OS Communications Server: IP Configuration Guide. The advanced socket API for IPv6 support includes:

IPv6 RAW socket support
New socket options
New ancillary data objects on sendmsg/recvmsg
The ability to receive inbound packet information, including:
- Arriving interface index
- Destination IP address
- Hop limit
- Routing headers
- Hop-by-hop options
- Destination options
- Traffic class by way of ancillary data
The ability to set outgoing packet information, including:
- Interface to use
- Source IP address
- Hop limit
- Next hop address
- Routing headers
- Hop-by-hop options
- Destination option
- Traffic class ( This can be set by socket options or ancillary data with some restrictions.)

z/OS® UNIX C/C++ and z/OS UNIX Assembler Callable APIs support the advanced socket API for IPv6. The advanced socket API for IPv6 is not implemented in native TCP/IP socket APIs.

To obtain structure and length information that is related to the IPv6 advanced socket APIs, see http://tools.ietf.org/html/rfc3542.