llc_var.h

早期freebsd实现

/* 
 * Copyright (C) Dirk Husemann, Computer Science Department IV, 
 * 		 University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 * 
 * This code is derived from software contributed to Berkeley by
 * Dirk Husemann and the Computer Science Department (IV) of
 * the University of Erlangen-Nuremberg, Germany.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)llc_var.h	8.1 (Berkeley) 6/10/93
 */

#ifdef __STDC__
/*
 * Forward structure declarations for function prototypes [sic].
 */
struct llc;
#endif

#define	NPAIDB_LINK	0

struct npaidbentry {
	union {
		/* MAC,DLSAP -> CONS */
		struct {
			struct llc_linkcb *NE_link;
			struct rtentry *NE_rt;
		} NE;
		/* SAP info for unconfigured incoming calls */
		struct {
			u_short SI_class;
#define LLC_CLASS_I	0x1
#define	LLC_CLASS_II	0x3
#define LLC_CLASS_III	0x4				/* Future */
#define LLC_CLASS_IV	0x7				/* Future */
			u_short SI_window;
			u_short SI_trace;
			u_short SI_xchxid;
			void (*SI_input) 
				__P((struct mbuf *));
			caddr_t (*SI_ctlinput) 
				__P((int, struct sockaddr *, caddr_t));
		} SI;
	} NESIun;
};
#define np_link                 NESIun.NE.NE_link
#define np_rt                   NESIun.NE.NE_rt
#define si_class                NESIun.SI.SI_class
#define si_window               NESIun.SI.SI_window
#define si_trace                NESIun.SI.SI_trace
#define si_xchxid               NESIun.SI.SI_xchxid
#define si_input                NESIun.SI.SI_input
#define si_ctlinput             NESIun.SI.SI_ctlinput

#define NPDL_SAPNETMASK 0x7e

/*
 * Definitions for accessing bitfields/bitslices inside
 * LLC2 headers
 */
struct bitslice {
	unsigned int bs_mask;
	unsigned int bs_shift;
};


#define	i_z	        0
#define	i_ns	        1
#define	i_pf	        0
#define	i_nr	        1
#define	s_oz            2
#define	s_selector	3
#define	s_pf            0
#define	s_nr            1
#define	u_bb            2
#define	u_select_other	3
#define	u_pf            4
#define	u_select	5
#define	f_vs            1
#define	f_cr            0
#define	f_vr            1
#define	f_wxyzv         6

#define	LLCGBITS(Arg, Index)	(((Arg) & llc_bitslice[(Index)].bs_mask) >> llc_bitslice[(Index)].bs_shift)
#define	LLCSBITS(Arg, Index, Val)	(Arg) |= (((Val) << llc_bitslice[(Index)].bs_shift) & llc_bitslice[(Index)].bs_mask)
#define	LLCCSBITS(Arg, Index, Val)	(Arg) = (((Val) << llc_bitslice[(Index)].bs_shift) & llc_bitslice[(Index)].bs_mask)

extern struct bitslice llc_bitslice[];

#define LLC_CMD         0
#define LLC_RSP         1
#define LLC_MAXCMDRSP   2

/*
 * LLC events --- These events may either be frames received from the
 *                remote LLC DSAP, request from the network layer user, 
 *                timer events from llc_timer(), or diagnostic events from
 *                llc_input().  
 */

/* LLC frame types */
#define LLCFT_INFO                       0 * LLC_MAXCMDRSP
#define LLCFT_RR                         1 * LLC_MAXCMDRSP
#define LLCFT_RNR                        2 * LLC_MAXCMDRSP
#define LLCFT_REJ                        3 * LLC_MAXCMDRSP
#define LLCFT_DM                         4 * LLC_MAXCMDRSP
#define LLCFT_SABME                      5 * LLC_MAXCMDRSP
#define LLCFT_DISC                       6 * LLC_MAXCMDRSP
#define LLCFT_UA                         7 * LLC_MAXCMDRSP
#define LLCFT_FRMR                       8 * LLC_MAXCMDRSP
#define LLCFT_UI                         9 * LLC_MAXCMDRSP
#define LLCFT_XID                       10 * LLC_MAXCMDRSP
#define LLCFT_TEST                      11 * LLC_MAXCMDRSP

/* LLC2 timer events */
#define LLC_ACK_TIMER_EXPIRED           12 * LLC_MAXCMDRSP
#define LLC_P_TIMER_EXPIRED             13 * LLC_MAXCMDRSP
#define LLC_REJ_TIMER_EXPIRED           14 * LLC_MAXCMDRSP
#define LLC_BUSY_TIMER_EXPIRED          15 * LLC_MAXCMDRSP

/* LLC2 diagnostic events */
#define LLC_INVALID_NR                  16 * LLC_MAXCMDRSP
#define LLC_INVALID_NS                  17 * LLC_MAXCMDRSP
#define LLC_BAD_PDU                     18 * LLC_MAXCMDRSP
#define LLC_LOCAL_BUSY_DETECTED         19 * LLC_MAXCMDRSP
#define LLC_LOCAL_BUSY_CLEARED          20 * LLC_MAXCMDRSP

/* Network layer user requests */
/* 
 * NL_CONNECT_REQUEST --- The user has requested that a data link connection
 *                        be established with a remote LLC DSAP.
 */
#define NL_CONNECT_REQUEST              21 * LLC_MAXCMDRSP
/* 
 * NL_CONNECT_RESPONSE --- The user has accepted the data link connection.
 */
#define NL_CONNECT_RESPONSE             22 * LLC_MAXCMDRSP
/* 
 * NL_RESET_REQUEST --- The user has requested that the data link with the
 *                      remote LLC DSAP be reset.
 */
#define NL_RESET_REQUEST                23 * LLC_MAXCMDRSP
/* 
 * NL_RESET_RESPONSE --- The user has accepted the reset of the data link
 *                       connection.
 */
#define NL_RESET_RESPONSE               24 * LLC_MAXCMDRSP
/* 
 * NL_DISCONNECT_REQUEST --- The user has requested that the data link
 *                           connection with remote LLC DSAP be terminated.
 */
#define NL_DISCONNECT_REQUEST           25 * LLC_MAXCMDRSP
/*
 * NL_DATA_REQUEST --- The user has requested that a data unit be sent ot the
 *                     remote LLC DSAP.
 */
#define NL_DATA_REQUEST                 26 * LLC_MAXCMDRSP
/*
 * NL_INITIATE_PF_CYCLE --- The local LLC wants to initiate a P/F cycle.
 */
#define NL_INITIATE_PF_CYCLE            27 * LLC_MAXCMDRSP
/*
 * NL_LOCAL_BUSY_DETECTED --- The local entity has encountered a busy condition
 */
#define NL_LOCAL_BUSY_DETECTED          28 * LLC_MAXCMDRSP

#define LLCFT_NONE                      255

/* return message from state handlers */

/*
 * LLC_CONNECT_INDICATION --- Inform the user that a connection has been
 *                            requested by a remote LLC SSAP.
 */
#define LLC_CONNECT_INDICATION      1
/*
 * LLC_CONNECT_CONFIRM --- The connection service component indicates that the
 *                         remote network entity has accepted the connection.
 */
#define LLC_CONNECT_CONFIRM         2
/*
 * LLC_DISCONNECT_INDICATION --- Inform the user that the remote network
 *                               entity has intiated disconnection of the data
 *                               link connection.
 */
#define LLC_DISCONNECT_INDICATION   3
/*
 * LLC_RESET_CONFIRM --- The connection service component indicates that the
 *                       remote network entity has accepted the reset.
 */
#define LLC_RESET_CONFIRM           4
/*
 * LLC_RESET_INDICATION_REMOTE --- The remote network entity or remote peer
 *                                 has initiated a reset of the data link
 *                                 connection.
 */
#define LLC_RESET_INDICATION_REMOTE 5
/*
 * LLC_RESET_INDICATION_LOCAL --- The local LLC has determined that the data
 *                                link connection is in need of
 *                                reinitialization.
 */
#define LLC_RESET_INDICATION_LOCAL  6
/*
 * LLC_FRMR_RECEIVED --- The local connection service component has received a
 *                       FRMR response PDU.
 */
#define LLC_FRMR_RECEIVED           7
/*
 * LLC_FRMR_SENT --- The local connection component has received an ivalid
 *                   PDU, and has sent a FRMR response PDU.
 */
#define LLC_FRMR_SENT               8
/*
 * LLC_DATA_INDICATION --- The connection service component passes the data
 *                         unit from the received I PDU to the user.
 */
#define LLC_DATA_INDICATION         9
/*
 * LLC_REMOTE_NOT_BUSY --- The remote LLC DSAP is no longer busy. The local
 *                         connection service component will now accept a
 *                         DATA_REQUEST.
 */
#define LLC_REMOTE_NOT_BUSY         10
/*
 * LLC_REMOTE_BUSY --- The remote LLC DSAP is busy. The local connection
 *                     service component will not accept a DATA_REQUEST.
 */
#define LLC_REMOTE_BUSY             11

/* Internal return code */
#define LLC_PASSITON                255

#define INFORMATION_CONTROL	0x00
#define SUPERVISORY_CONTROL	0x02
#define UNUMBERED_CONTROL 	0x03 
 
/*
 * Other necessary definitions
 */
 
#define LLC_MAX_SEQUENCE    128
#define LLC_MAX_WINDOW	    127
#define LLC_WINDOW_SIZE	    7

/*
 * Don't we love this one? CCITT likes to suck on bits 8=)
 */
#define NLHDRSIZEGUESS      3

/*
 * LLC control block
 */

struct llc_linkcb {
	struct llccb_q {
		struct llccb_q *q_forw;			/* admin chain */
		struct llccb_q *q_backw;
	} llcl_q;
	struct npaidbentry  	*llcl_sapinfo;		/* SAP information */
	struct sockaddr_dl 	llcl_addr;		/* link snpa address */
	struct rtentry 		*llcl_nlrt;		/* layer 3 -> LLC */
	struct rtentry		*llcl_llrt;		/* LLC -> layer 3 */
	struct ifnet            *llcl_if;           	/* our interface */
	caddr_t			llcl_nlnext;		/* cb for network layer */
	struct mbuf   	 	*llcl_writeqh;		/* Write queue head */
	struct mbuf    		*llcl_writeqt;		/* Write queue tail */
	struct mbuf    		**llcl_output_buffers;
	short                   llcl_timers[6];         /* timer array */
	long                    llcl_timerflags;        /* flags signalling running timers */
	int                     (*llcl_statehandler)
		__P((struct llc_linkcb *, struct llc *, int, int, int));
	int                     llcl_P_flag;
	int                     llcl_F_flag;
	int                     llcl_S_flag;
	int                     llcl_DATA_flag;
	int                     llcl_REMOTE_BUSY_flag;
	int                     llcl_DACTION_flag;      /* delayed action */
	int                     llcl_retry;
	/*
	 * The following components deal --- in one way or the other ---
	 * with the LLC2 window. Indicated by either [L] or [W] is the
	 * domain of the specific component:
	 *
	 *        [L]    The domain is 0--LLC_MAX_WINDOW
         *        [W]    The domain is 0--llcl_window
	 */
	short           	llcl_vr;                /* next to receive [L] */
	short           	llcl_vs;                /* next to send [L] */
	short           	llcl_nr_received;       /* next frame to b ack'd [L] */
	short                   llcl_freeslot;          /* next free slot [W] */
	short                   llcl_projvs;            /* V(S) associated with freeslot */
	short                   llcl_slotsfree;         /* free slots [W] */
	short           	llcl_window;            /* window size */
	/*
	 * In llcl_frmrinfo we jot down the last frmr info field, which we
	 * need to do as we need to be able to resend it in the ERROR state.
	 */
	struct frmrinfo         llcl_frmrinfo;          /* last FRMR info field */
};
#define llcl_frmr_pdu0          llcl_frmrinfo.rej_pdu_0