llc_var.h

早期freebsd实现

#define llcl_frmr_pdu1          llcl_frmrinfo.rej_pdu_1
#define llcl_frmr_control       llcl_frmrinfo.frmr_control
#define llcl_frmr_control_ext   llcl_frmrinfo.frmr_control_ext
#define llcl_frmr_cause         llcl_frmrinfo.frmr_cause

#define	LQNEXT(l)	(struct llc_linkcb *)((l)->llcl_q.q_forw)
#define	LQEMPTY		(llccb_q.q_forw == &llccb_q)
#define	LQFIRST		(struct llc_linkcb *)(llccb_q.q_forw)
#define LQVALID(l)	(!((struct llccb_q *)(l) == &llccb_q))

#define LLC_ENQUEUE(l, m) if ((l)->llcl_writeqh == NULL) { \
				(l)->llcl_writeqh = (m); \
				(l)->llcl_writeqt = (m); \
			} else { \
				(l)->llcl_writeqt->m_nextpkt = (m); \
				(l)->llcl_writeqt = (m); \
			}

#define LLC_DEQUEUE(l, m) if ((l)->llcl_writeqh == NULL) \
                                (m) = NULL; \
                          else { \
				(m) = (l)->llcl_writeqh; \
				(l)->llcl_writeqh = (l)->llcl_writeqh->m_nextpkt; \
			}

#define LLC_SETFRAME(l, m) { \
			        if ((l)->llcl_slotsfree > 0) { \
				        (l)->llcl_slotsfree--; \
					(l)->llcl_output_buffers[(l)->llcl_freeslot] = (m); \
					(l)->llcl_freeslot = ((l)->llcl_freeslot+1) % (l)->llcl_window; \
					LLC_INC((l)->llcl_projvs); \
				} \
		           }

/*
 * handling of sockaddr_dl's
 */

#define LLADDRLEN(s) 	((s)->sdl_alen + (s)->sdl_nlen)
#define	LLSAPADDR(s) 	((s)->sdl_data[LLADDRLEN(s)-1] & 0xff)
#define LLSAPLOC(s, if) ((s)->sdl_nlen + (if)->if_addrlen)

struct sdl_hdr {
	struct sockaddr_dl sdlhdr_dst;
	struct sockaddr_dl sdlhdr_src;
	long sdlhdr_len;
};

#define LLC_GETHDR(f,m) { \
				struct mbuf *_m = (struct mbuf *) (m); \
				if (_m) { \
					M_PREPEND(_m, LLC_ISFRAMELEN, M_DONTWAIT); \
					bzero(mtod(_m, caddr_t), LLC_ISFRAMELEN); \
				} else { \
					MGETHDR (_m, M_DONTWAIT, MT_HEADER); \
					if (_m != NULL) { \
						_m->m_pkthdr.len = _m->m_len = LLC_UFRAMELEN; \
						_m->m_next = _m->m_act = NULL; \
						bzero(mtod(_m, caddr_t), LLC_UFRAMELEN); \
					} else return; \
				} \
				(m) = _m; \
				(f) = mtod(m, struct llc *); \
		      }

#define LLC_NEWSTATE(l, LLCstate) (l)->llcl_statehandler = llc_state_##LLCstate
#define LLC_STATEEQ(l, LLCstate) ((l)->llcl_statehandler == llc_state_##LLCstate ? 1 : 0)

#define LLC_ACK_SHIFT      0
#define LLC_P_SHIFT        1
#define LLC_BUSY_SHIFT     2
#define LLC_REJ_SHIFT      3
#define LLC_AGE_SHIFT      4
#define LLC_DACTION_SHIFT  5

#define LLC_TIMER_NOTRUNNING    0
#define LLC_TIMER_RUNNING       1
#define LLC_TIMER_EXPIRED       2

#define LLC_STARTTIMER(l, LLCtimer) { \
				 (l)->llcl_timers[LLC_##LLCtimer##_SHIFT] = llc_##LLCtimer##_timer; \
				 (l)->llcl_timerflags |= (1<<LLC_##LLCtimer##_SHIFT); \
				 }
#define LLC_STOPTIMER(l, LLCtimer) { \
				 (l)->llcl_timers[LLC_##LLCtimer##_SHIFT] = 0; \
				 (l)->llcl_timerflags &= ~(1<<LLC_##LLCtimer##_SHIFT); \
				 }
#define LLC_AGETIMER(l, LLCtimer) if ((l)->llcl_timers[LLC_##LLCtimer##_SHIFT] > 0) \
	                                  (l)->llcl_timers[LLC_##LLCtimer##_SHIFT]--;

#define LLC_TIMERXPIRED(l, LLCtimer) \
	(((l)->llcl_timerflags & (1<<LLC_##LLCtimer##_SHIFT)) ? \
	 (((l)->llcl_timers[LLC_##LLCtimer##_SHIFT] == 0 ) ? \
	  LLC_TIMER_EXPIRED : LLC_TIMER_RUNNING) : LLC_TIMER_NOTRUNNING)

#define FOR_ALL_LLC_TIMERS(t) for ((t) = LLC_ACK_SHIFT; (t) < LLC_AGE_SHIFT; (t)++)

#define LLC_SETFLAG(l, LLCflag, v) (l)->llcl_##LLCflag##_flag = (v)
#define LLC_GETFLAG(l, LLCflag) (l)->llcl_##LLCflag##_flag

#define LLC_RESETCOUNTER(l) { \
				      (l)->llcl_vs = (l)->llcl_vr = (l)->llcl_retry = 0; \
				      llc_resetwindow((l)); \
			      }

/*
 * LLC2 macro definitions
 */
				    

#define LLC_START_ACK_TIMER(l) LLC_STARTTIMER((l), ACK)
#define LLC_STOP_ACK_TIMER(l) LLC_STOPTIMER((l), ACK)
#define LLC_START_REJ_TIMER(l) LLC_STARTTIMER((l), REJ)
#define LLC_STOP_REJ_TIMER(l) LLC_STOPTIMER((l), REJ)
#define LLC_START_P_TIMER(l) { \
				      LLC_STARTTIMER((l), P); \
				      if (LLC_GETFLAG((l), P) == 0) \
					      (l)->llcl_retry = 0; \
				      LLC_SETFLAG((l), P, 1); \
			     }
#define LLC_STOP_P_TIMER(l) { \
				      LLC_STOPTIMER((l), P); \
				      LLC_SETFLAG((l), P, 0); \
			    }
#define LLC_STOP_ALL_TIMERS(l) { \
				      LLC_STOPTIMER((l), ACK); \
				      LLC_STOPTIMER((l), REJ); \
				      LLC_STOPTIMER((l), BUSY); \
				      LLC_STOPTIMER((l), P); \
			    }


#define LLC_INC(i) (i) = ((i)+1) % LLC_MAX_SEQUENCE

#define LLC_NR_VALID(l, nr)     ((l)->llcl_vs < (l)->llcl_nr_received ? \
	                             (((nr) >= (l)->llcl_nr_received) || \
	                              ((nr) <= (l)->llcl_vs) ? 1 : 0) : \
	                             (((nr) <= (l)->llcl_vs) && \
	                              ((nr) >= (l)->llcl_nr_received) ? 1 : 0))

#define LLC_UPDATE_P_FLAG(l, cr, pf) { \
			   if ((cr) == LLC_RSP && (pf) == 1) { \
			           LLC_SETFLAG((l), P, 0); \
				   LLC_STOPTIMER((l), P); \
			    } \
			    }

#define LLC_UPDATE_NR_RECEIVED(l, nr) { \
			    while ((l)->llcl_nr_received != (nr)) { \
				    struct mbuf *_m; \
				    register short seq; \
				    if (_m = (l)->llcl_output_buffers[seq = llc_seq2slot((l), (l)->llcl_nr_received)]) \
					    m_freem(_m); \
				    (l)->llcl_output_buffers[seq] = NULL; \
				    LLC_INC((l)->llcl_nr_received); \
				    (l)->llcl_slotsfree++; \
			    } \
			    (l)->llcl_retry = 0; \
			    if ((l)->llcl_slotsfree < (l)->llcl_window) { \
				    LLC_START_ACK_TIMER(l); \
			    } else LLC_STOP_ACK_TIMER(l); \
			    LLC_STARTTIMER((l), DACTION); \
			    }

#define LLC_SET_REMOTE_BUSY(l,a) { \
			    if (LLC_GETFLAG((l), REMOTE_BUSY) == 0) { \
				    LLC_SETFLAG((l), REMOTE_BUSY, 1); \
				    LLC_STARTTIMER((l), BUSY); \
				    (a) = LLC_REMOTE_BUSY; \
			    } else { \
				    (a) = 0; \
			    } \
			    }
#define LLC_CLEAR_REMOTE_BUSY(l,a) { \
			    if (LLC_GETFLAG((l), REMOTE_BUSY) == 1) { \
				    LLC_SETFLAG((l), REMOTE_BUSY, 1); \
				    LLC_STOPTIMER((l), BUSY); \
				    if (LLC_STATEEQ((l), NORMAL) || \
					LLC_STATEEQ((l), REJECT) || \
					LLC_STATEEQ((l), BUSY)) \
						llc_resend((l), LLC_CMD, 0); \
				    (a) = LLC_REMOTE_NOT_BUSY; \
			    } else { \
				    (a) = 0; \
			    } \
			    }

#define LLC_DACKCMD      0x1
#define LLC_DACKCMDPOLL  0x2
#define LLC_DACKRSP      0x3
#define LLC_DACKRSPFINAL 0x4

#define LLC_SENDACKNOWLEDGE(l, cmd, pf) { \
			   if ((cmd) == LLC_CMD) { \
				   LLC_SETFLAG((l), DACTION, ((pf) == 0 ? LLC_DACKCMD : LLC_DACKCMDPOLL)); \
			   } else { \
				   LLC_SETFLAG((l), DACTION, ((pf) == 0 ? LLC_DACKRSP : LLC_DACKRSPFINAL)); \
			   } \
		   }

#define LLC_FRMR_W     (1<<0)
#define LLC_FRMR_X     (1<<1)
#define LLC_FRMR_Y     (1<<2)
#define LLC_FRMR_Z     (1<<3)
#define LLC_FRMR_V     (1<<4)

#define LLC_SETFRMR(l, f, cr, c) { \
			   if ((f)->llc_control & 0x3) { \
				   (l)->llcl_frmr_pdu0 = (f)->llc_control; \
				   (l)->llcl_frmr_pdu1 = 0; \
			   } else { \
				   (l)->llcl_frmr_pdu0 = (f)->llc_control; \
				   (l)->llcl_frmr_pdu1 = (f)->llc_control_ext; \
			   } \
			   LLCCSBITS((l)->llcl_frmr_control, f_vs, (l)->llcl_vs); \
			   LLCCSBITS((l)->llcl_frmr_control_ext, f_cr, (cr)); \
			   LLCSBITS((l)->llcl_frmr_control_ext, f_vr, (l)->llcl_vr); \
			   LLCCSBITS((l)->llcl_frmr_cause, f_wxyzv, (c)); \
			}

/*
 * LLC tracing levels:
 *     LLCTR_INTERESTING        interesting event, we might care to know about
 *                              it, but then again, we might not ...
 *     LLCTR_SHOULDKNOW         we probably should know about this event
 *     LLCTR_URGENT             something has gone utterly wrong ...
 */
#define LLCTR_INTERESTING       1
#define LLCTR_SHOULDKNOW        2
#define LLCTR_URGENT            3

#ifdef LLCDEBUG
#define LLC_TRACE(lp, l, msg) llc_trace((lp), (l), (msg))
#else /* LLCDEBUG */
#define LLC_TRACE(lp, l, msg) /* NOOP */
#endif /* LLCDEBUG */
				      
#define LLC_N2_VALUE	  15              /* up to 15 retries */
#define LLC_ACK_TIMER     10              /*  5 secs */
#define LLC_P_TIMER        4              /*  2 secs */
#define LLC_BUSY_TIMER    12              /*  6 secs */
#define LLC_REJ_TIMER     12              /*  6 secs */
#define LLC_AGE_TIMER     40              /* 20 secs */
#define LLC_DACTION_TIMER  2              /*  1 secs */

#if defined (KERNEL) && defined(LLC)
extern int llc_n2;
extern int llc_ACK_timer;
extern int llc_P_timer;
extern int llc_REJ_timer;
extern int llc_BUSY_timer;
extern int llc_AGE_timer;
extern int llc_DACTION_timer;

extern int af_link_rts_init_done;

#define USES_AF_LINK_RTS { \
	if (!af_link_rts_init_done) { \
	       rn_inithead((void **)&rt_tables[AF_LINK], 32); \
	       af_link_rts_init_done++; \
	       } \
	 }

struct ifqueue llcintrq;

extern struct llccb_q llccb_q;
extern char *frame_names[];

/* 
 * Function prototypes
 */
int sdl_cmp __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_copy __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_swapaddr __P((struct sockaddr_dl *, struct sockaddr_dl *));
int sdl_checkaddrif __P((struct ifnet *, struct sockaddr_dl *));
int sdl_setaddrif __P((struct ifnet *, u_char *, u_char, u_char, 
		      struct sockaddr_dl *));
int sdl_sethdrif __P((struct ifnet *, u_char *, u_char, u_char *, u_char, u_char, 
		      struct sdl_hdr *));
struct npaidbentry *llc_setsapinfo __P((struct ifnet *, u_char, u_char,
					struct dllconfig *));
struct npaidbentry *llc_getsapinfo __P((u_char, struct ifnet *));
struct rtentry *npaidb_enrich __P((short, caddr_t, struct sockaddr_dl *));
int npaidb_destroy __P((struct rtentry *));
short llc_seq2slot __P((struct llc_linkcb *, short));
int llc_state_ADM __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_CONN __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_RESET_WAIT __P((struct llc_linkcb *, struct llc *, 
			      int, int, int));
int llc_state_RESET_CHECK __P((struct llc_linkcb *, struct llc *, 
			       int, int, int));
int llc_state_SETUP __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_RESET __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_D_CONN __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_ERROR __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_NBRAcore __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_NORMAL __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_BUSY __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_REJECT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT_BUSY __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_state_AWAIT_REJECT __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_statehandler __P((struct llc_linkcb *, struct llc *, int, int, int));
int llc_init __P((void));
struct llc_linkcb *llc_newlink __P((struct sockaddr_dl *, struct ifnet *, 
				    struct rtentry *, caddr_t, struct rtentry *));
int llc_dellink __P((struct llc_linkcb *));
int llc_anytimersup __P((struct llc_linkcb *));
char * llc_getstatename __P((struct llc_linkcb *));
void llc_link_dump __P((struct llc_linkcb *, const char *));
void llc_trace __P((struct llc_linkcb *, int, const char *));
void llc_resetwindow __P((struct llc_linkcb *));
int llc_decode __P((struct llc *, struct llc_linkcb *));
void llc_timer __P((void));
void llcintr __P((void));
int llc_input __P((struct llc_linkcb *, struct mbuf *, u_char));
caddr_t llc_ctlinput __P((int, struct sockaddr *, caddr_t));
int llc_output __P((struct llc_linkcb *, struct mbuf *));
void llc_start __P((struct llc_linkcb *));
int llc_send __P((struct llc_linkcb *, int, int, int));
int llc_resend __P((struct llc_linkcb *, int, int));
int llc_rawsend __P((struct llc_linkcb *, struct mbuf *, struct llc *, int, int,
		    int, int));
int cons_rtrequest __P((int, struct rtentry *, struct sockaddr *));
int x25_llcglue __P((int, struct sockaddr *));

#endif