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NetBSD 6.1.5 - man page for atalk (netbsd section 4)

ATALK(4)			   BSD 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 network 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 imple-
     mentation 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 structure:

	   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 pri-
     mary address are returned with getsockname(2).

PROTOCOLS
     The AppleTalk protocol family comprises the DDP datagram delivery protocol, AppleTalk Data
     Stream Protocol (ADSP), AppleTalk Echo Protocol (AEP), AppleTalk Filing Protocol (AFP),
     AppleTalk Session Protocol (ASP), AppleTalk Transaction Protocol (ATP), Name Binding Proto-
     col (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 protocols using the Netatalk package.  Netatalk imple-
     ments 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.

BSD					November 14, 1997				      BSD


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