RFC 2292 (rfc2292) - Page 2 of 67

Advanced Sockets API for IPv6

RFC 2292             Advanced Sockets API for IPv6         February 1998


Table of Contents

    1.  Introduction ................................................3
    2.  Common Structures and Definitions ...........................5
       2.1.  The ip6_hdr Structure ..................................5
            2.1.1.  IPv6 Next Header Values .........................6
            2.1.2.  IPv6 Extension Headers ..........................6
       2.2.  The icmp6_hdr Structure ................................8
            2.2.1.  ICMPv6 Type and Code Values .....................8
            2.2.2.  ICMPv6 Neighbor Discovery Type and Code Values ..9
       2.3.  Address Testing Macros .................................12
       2.4.  Protocols File .........................................12
    3.  IPv6 Raw Sockets ............................................13
       3.1.  Checksums ..............................................14
       3.2.  ICMPv6 Type Filtering ..................................14
    4.  Ancillary Data ..............................................17
       4.1.  The msghdr Structure ...................................18
       4.2.  The cmsghdr Structure ..................................18
       4.3.  Ancillary Data Object Macros ...........................19
            4.3.1.  CMSG_FIRSTHDR ...................................20
            4.3.2.  CMSG_NXTHDR .....................................22
            4.3.3.  CMSG_DATA .......................................22
            4.3.4.  CMSG_SPACE ......................................22
            4.3.5.  CMSG_LEN ........................................22
       4.4.  Summary of Options Described Using Ancillary Data ......23
       4.5.  IPV6_PKTOPTIONS Socket Option ..........................24
            4.5.1.  TCP Sticky Options ..............................25
            4.5.2.  UDP and Raw Socket Sticky Options ...............26
    5.  Packet Information ..........................................26
       5.1.  Specifying/Receiving the Interface .....................27
       5.2.  Specifying/Receiving Source/Destination Address ........27
       5.3.  Specifying/Receiving the Hop Limit .....................28
       5.4.  Specifying the Next Hop Address ........................29
       5.5.  Additional Errors with sendmsg() .......................29
    6.  Hop-By-Hop Options ..........................................30
       6.1.  Receiving Hop-by-Hop Options ...........................31
       6.2.  Sending Hop-by-Hop Options .............................31
       6.3.  Hop-by-Hop and Destination Options Processing ..........32
            6.3.1.  inet6_option_space ..............................32
            6.3.2.  inet6_option_init ...............................32
            6.3.3.  inet6_option_append .............................33
            6.3.4.  inet6_option_alloc ..............................33
            6.3.5.  inet6_option_next ...............................34
            6.3.6.  inet6_option_find ...............................35
            6.3.7.  Options Examples ................................35
    7.  Destination Options .........................................42
       7.1.  Receiving Destination Options ..........................42
       7.2.  Sending Destination Options ............................43



Stevens & Thomas             Informational