121 struct tp_pcb {  struct
122 	struct tp_pcb		*tp_next;  argument
123 	struct tp_pcb		*tp_prev;  argument
124 	struct tp_pcb		*tp_nextlisten; /* chain all listeners */  argument
125 	struct socket 		*tp_sock;		/* back ptr */
126 	u_short 			tp_state;		/* state of fsm */
127 	short 				tp_retrans;		/* # times can still retrans */
128 	caddr_t				tp_npcb;		/* to lower layer pcb */
129 	struct nl_protosw	*tp_nlproto;	/* lower-layer dependent routines */
130 	struct rtentry		**tp_routep;	/* obtain mtu; inside npcb */
133 	RefNum				tp_lref;	 	/* local reference */
134 	RefNum 				tp_fref;		/* foreign reference */
136 	u_int				tp_seqmask;		/* mask for seq space */
137 	u_int				tp_seqbit;		/* bit for seq number wraparound */
138 	u_int				tp_seqhalf;		/* half the seq space */
140 	struct mbuf			*tp_ucddata;	/* user connect/disconnect data */
143 	u_short 			tp_fcredit;		/* current remote credit in # packets */
144 	u_short 			tp_maxfcredit;	/* max remote credit in # packets */
145 	u_short				tp_dupacks;		/* intuit packet loss before rxt timo */
146 	u_long				tp_cong_win;	/* congestion window in bytes.
149 	u_long				tp_ssthresh;	/* cong_win threshold for slow start
152 	SeqNum				tp_snduna;		/* seq # of lowest unacked DT */
153 	SeqNum				tp_sndnew;		/* seq # of lowest unsent DT  */
154 	SeqNum				tp_sndnum;		/* next seq # to be assigned */
155 	SeqNum				tp_sndnxt;		/* what to do next; poss. rxt */
156 	struct mbuf			*tp_sndnxt_m;	/* packet corres. to sndnxt*/
157 	int					tp_Nwindow;		/* for perf. measurement */
160 	SeqNum				tp_rcvnxt;		/* next DT seq # expect to recv */
161 	SeqNum	 			tp_sent_lcdt;	/* cdt according to last ack sent */
162 	SeqNum	 			tp_sent_uwe;	/* uwe according to last ack sent */
163 	SeqNum	 			tp_sent_rcvnxt;	/* rcvnxt according to last ack sent 
166 	u_short				tp_lcredit;		/* current local credit in # packets */
167 	u_short				tp_maxlcredit;	/* needed for reassembly queue */
168 	struct mbuf			**tp_rsyq;		/* unacked stuff recvd out of order */
169 	int					tp_rsycnt;		/* number of packets "" "" "" ""    */
170 	u_long				tp_rhiwat;		/* remember original RCVBUF size */
173 	u_int               tp_win_recv;
177 	struct cong_sample {
181 	} tp_cong_sample;
185 	struct tp_conn_param _tp_param; 
214 	int					tp_l_tpdusize;
219 	int					tp_rtv;			/* max round-trip time variance */
220 	int					tp_rtt; 		/* smoothed round-trip time */
221 	SeqNum				tp_rttseq;		/* packet being timed */
222 	int					tp_rttemit;		/* when emitted, in ticks */
223 	int					tp_idle;		/* last activity, in ticks */
224 	short				tp_rxtcur;		/* current retransmit value */
225 	short				tp_rxtshift;	/* log(2) of rexmt exp. backoff */
226 	u_char				tp_cebit_off;	/* real DEC bit algorithms not in use */
227 	u_char				tp_oktonagle;	/* Last unsent pckt may be append to */
228 	u_char				tp_flags;		/* values: */
240 		tp_sendfcc:1,			/* shall next ack include FCC parameter? */
241 		tp_trace:1,				/* is this pcb being traced? (not used yet) */
242 		tp_perf_on:1,			/* 0/1 -> performance measuring on  */
243 		tp_reneged:1,			/* have we reneged on cdt since last ack? */
244 		tp_decbit:3,			/* dec bit was set, we're in reneg mode  */
245 		tp_notdetached:1;		/* Call tp_detach before freeing XXXXXXX */
270 	struct tp_pcb		*tp_fasttimeo;		/* limit pcbs to examine */  argument
271 	u_int			 	tp_timer[TM_NTIMERS]; /* C timers */
273 	struct sockbuf		tp_Xsnd;		/* for expedited data */
276 	SeqNum				tp_Xsndnxt;	/* next XPD seq # to send */
277 	SeqNum				tp_Xuna;		/* seq # of unacked XPD */
278 	SeqNum				tp_Xrcvnxt;	/* next XPD seq # expect to recv */
281 	u_short				tp_s_subseq;	/* next subseq to send */
282 	u_short				tp_r_subseq;	/* highest recv subseq */