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ATALK(4)                NetBSD Kernel Interfaces Manual               ATALK(4)


NAME

     atalk -- AppleTalk Protocol Family


SYNOPSIS

     #include <sys/types.h>
     #include <netatalk/at.h>


DESCRIPTION

     The AppleTalk Protocol Family provides presentation layer support for the
     AppleTalk Datagram Delivery Protocol (DDP), using the SOCK_DGRAM socket
     type.  In addition, access to in-kernel AppleTalk routing tables and net-
     work interface configurations is provided.

     The AppleTalk Protocol Suite provides support for five kinds of physical
     media: LocalTalk (230kbps wire-or'd serial), Ethernet, FDDI, Token Ring,
     and asynchronous serial connections (using either AppleTalk Remote Access
     (ARA) or PPP ).  Currently, NetBSD's AppleTalk implementation supports
     Ethernet, FDDI, and Token Ring.

     AppleTalk packets are encapsulated on the Ethernet using the EtherTalk
     Link Access Protocol (ELAP).  Local network address resolution is handled
     using the AppleTalk Address Resolution Protocol (AARP).  Neither of these
     protocols is exposed to user-mode applications.


ADDRESSING

     AppleTalk addresses are three byte quantities, stored in network byte
     order.  The include file <netatalk/at.h> defines the AppleTalk address
     format.

     Sockets in the AppleTalk protocol family use the following address struc-
     ture:

           struct sockaddr_at {
                   uint8_t sat_len;
                   sa_family_t     sat_family;
                   uint8_t sat_port;
                   struct at_addr  sat_addr;
                   union {
                           struct netrange r_netrange;
                           char            r_zero[8];
                   } sat_range;
           };

     The port of a socket may be set with bind(2).  The node for bind(2) must
     always be ATADDR_ANYNODE: ``this node''.  The net must be ATADDR_ANYNET.
     ATADDR_ANYNET corresponds to the machine's ``primary'' address (the first
     configured).  The port of a socket and the primary address are returned
     with getsockname(2).


PROTOCOLS

     The AppleTalk protocol family comprises the DDP datagram delivery proto-
     col, AppleTalk Data Stream Protocol (ADSP), AppleTalk Echo Protocol
     (AEP), AppleTalk Filing Protocol (AFP), AppleTalk Session Protocol (ASP),
     AppleTalk Transaction Protocol (ATP), Name Binding Protocol (NBP),
     Printer Access Protocol (PAP), and Zone Information Protocol (ZIP).

     DDP is implemented in the kernel as SOCK_DGRAM sockets in the
     AF_APPLETALK address family.  NetBSD implements all other AppleTalk pro-
     tocols using the Netatalk package.  Netatalk implements all functions
     except for ADSP and an AFP client.  AEP, NBP, and ZIP services are pro-
     vided by the atalkd daemon.  ASP and ATP services are provided by a user
     library.  PAP and AFP services are provided by user programs and daemons.


SEE ALSO

     bind(2), getsockname(2), options(4)

     Gursharan S. Sidhu, Richard F. Andrews, and Alan B. Oppenheimer, Inside
     AppleTalk, second edition.

NetBSD 5.2.3                   November 14, 1997                  NetBSD 5.2.3