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- /* AX.25 datagram (address) sub-layer definitions */
-
- /* Maximum number of digipeaters */
- #define MAXDIGIS 8 /* 8 digipeaters plus src/dest */
- #define ALEN 6 /* Number of chars in callsign field */
- #define AXALEN 7 /* Total AX.25 address length, including SSID */
-
- /* Internal representation of an AX.25 address */
- struct ax25_addr {
- char call[ALEN];
- char ssid;
- #define SSID 0x1e /* Sub station ID */
- #define REPEATED 0x80 /* Has-been-repeated bit in repeater field */
- #define E 0x01 /* Address extension bit */
- #define C 0x80 /* Command/response designation */
- };
- #define NULLAXADDR (struct ax25_addr *)0
-
- /* Internal representation of an AX.25 header */
- struct ax25 {
- struct ax25_addr dest; /* Destination address */
- struct ax25_addr source; /* Source address */
- struct ax25_addr digis[MAXDIGIS]; /* Digi string */
- int ndigis; /* Number of digipeaters */
- int cmdrsp; /* Command/response */
- };
-
- /* Per-call control block
- * These are indexed through 3 hash tables.
- * One table contains entries for each callsign capable of digipeating,
- * the second table contains entries each connectable callsign + the broadcast
- * addresses for IP and ARP (QST-0) and NET/ROM (NODES-0). The third table
- * contains AX25 callsigns to be excluded from connects and digipeats.
- *
- * When it is a connectable callsing with a port number, initial upcall handlers
- * will also be stored by the server on this port.
- * The tables are used in ax_recv().
- */
- struct ax25_call {
- struct ax25_call *next; /* Doubly linked list pointers */
- struct ax25_call *prev;
-
- struct ax25_call *p_next; /* Doubly linked list of port numbers */
- struct ax25_call *p_prev;
-
- struct ax25_addr addr; /* Callsign */
- struct interface *interface; /* Associated interface */
- int port; /* AX25 port number (when connectable) */
- /* fixed port numbers for ax.25 servers */
-
- #define TNCPORT 1 /* interactive AX25 connection port */
- #define NETDIGIPORT 2 /* intelligent digipeater */
- #define MHEARDPORT 3 /* show MHEARD list */
- #define BRIDGEPORT 4 /* conference bridge */
- #define TNC2PORT 5 /* TNC2 emulator */
- #define MBOXPORT 6 /* mini mailbox */
-
- int mode; /* Operation mode for this callsign */
- #define IP_ARP_CON 0 /* Normal callsign for interface */
- #define CONNECT 1 /* AX25 connected mode */
- #define DIGIPEAT 2 /* Standard digipeater, or gateway */
- #define DIGICONNECT 3 /* Digipeater simulating a connect */
-
- int flags; /* Capability and Permission flags */
- #define MULTICAST 0x01 /* Set if this entry is the multicast addr */
- #define MULTI_IF 0x02 /* Set if callsign valid on all interfaces */
- #define DIGIGATEWAY 0x04 /* Set if digipeater is a gateway */
- #define IP_ARP_MULTI 0x10 /* when MULTICAST, this is QST-0 */
- #define NETROM_MULTI 0x20 /* when MULTICAST, this is NODES-0 */
-
- void (*r_upcall)(); /* Receiver upcall */
- void (*t_upcall)(); /* Transmit upcall */
- void (*s_upcall)(); /* State change upcall */
- char *user; /* User pointer */
- };
- #define NULLAXCALL (struct ax25_call *)0
- extern struct ax25_call *ax25_digi[];
- extern struct ax25_call *ax25_call[];
- extern struct ax25_call *ax25_excl[];
- extern struct ax25_call *ax25_port;
- extern struct ax25_call *cr_axcall(),*find_axcall();
-
- /* C-bit stuff */
- #define UNKNOWN 0
- #define COMMAND 1
- #define RESPONSE 2
-
- /* Bit fields in AX.25 Level 3 Protocol IDs (PIDs)
- * The high order two bits control multi-frame messages.
- * The lower 6 bits is the actual PID. Single-frame messages are
- * sent with both the FIRST and LAST bits set, so that the resulting PIDs
- * are compatible with older code.
- */
- #define PID_FIRST 0x80 /* Frame is first in a message */
- #define PID_LAST 0x40 /* Frame is last in a message */
- #define PID_PID 0x3f /* Protocol ID subfield */
-
- #define PID_IP 0x0c /* ARPA Internet Protocol */
- #define PID_ARP 0x0d /* ARPA Address Resolution Protocol */
- #define PID_NETROM 0x0f /* NET/ROM */
- #define PID_NO_L3 0x30 /* No level 3 protocol */
-