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slfp.h
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C/C++ Source or Header
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1994-07-11
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2KB
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39 lines
/* SLFP definitions */
#define SLFP_ALLOC 40 /* Receiver allocation increment */
typedef unsigned char BYTE ;
#define SLFP_ESC (BYTE)0362 /* Escape octet */
#define SLFP_REQ (BYTE)0363 /* REQuest to Send octet */
#define SLFP_ACK (BYTE)0364 /* ACKnowledge a REQuest (clr to snd) */
#define SLFP_END (BYTE)0365 /* END of Packet octet */
#define ACK_LEN 1 /* Length of a SL/FP Acknowledge sequence */
#define REQ_LEN 1 /* Length of a SL/FP Request sequence */
#define HDR_LEN 4 /* Length of a SL/FP Packet Header */
#define SLFP_IP_HDR 0 /* slfp_hdr index for IP Header */
#define SLFP_ADDR_REQ 1 /* slfp_hdr index for "Addr Request" Header */
/* SL/FP protocol control structure */
struct slfp {
struct mbuf *sndq; /* Encapsulated packets awaiting transmission */
struct timer ar_timer ; /* Timer for Address Request */
char ar_pending ; /* =1 iff waiting for Addr Reply */
struct timer req_timer; /* Timer for receipt of ACK to our REQ */
char req_pending; /* State of wait for ACK of our REQ */
int16 reqcnt; /* Number of times current ACK has been REQ'd */
int16 sndcnt; /* Number of datagrams on queue */
char escaped; /* Receiver State control flag */
char reqd; /* =1 iff between REQ and END of rcv'g packet */
struct mbuf *rbp; /* Head of mbuf chain being filled */
struct mbuf *rbp1;
char *rcp; /* Write pointer */
int16 rcnt; /* Length of mbuf chain */
struct mbuf *tbp; /* Transmit mbuf being sent */
int16 errors; /* Receiver input errors */
int16 bad_esc; /* Count of Bad SLFP_ESC sequences */
int16 missed_ends; /* Count of SLFP_REQ's rcv'd before prev END */
int16 false_acks; /* Count of SLFP_ACK's rcv'd sans pending xmt */
int (*recv)(); /* Function to call with an incoming buffer */
};
extern struct slfp slfp[];