usr/src/sys/netinet/tcp_fsm.h

/*      tcp_fsm.h       4.8     81/11/25        */

/*
 * TCP FSM state definitions.
 * Per RFC793, September, 1981.
 */

#define TCP_NSTATES     11

#define TCPS_CLOSED             0       /* closed */
#define TCPS_LISTEN             1       /* listening for connection */
#define TCPS_SYN_SENT           2       /* active, have sent syn */
#define TCPS_SYN_RCVD           3       /* have send and received syn */
/* states < TCPS_ESTABLISHED are those where connections not established */
#define TCPS_ESTABLISHED        4       /* established */
#define TCPS_CLOSE_WAIT         8       /* rcvd fin, waiting for close */
/* states > TCPS_CLOSE_WAIT are those where user has closed */
#define TCPS_FIN_WAIT_1         5       /* have closed, sent fin */
#define TCPS_FIN_WAIT_2         6       /* have closed, fin is acked */
#define TCPS_TIME_WAIT          7       /* in 2*msl quiet wait after close */
#define TCPS_CLOSING            9       /* closed xchd FIN; await FIN ACK */
#define TCPS_LAST_ACK           10      /* had fin and close; await FIN ACK */

#define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RCVD)
#define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)

#ifdef KPROF
int     tcp_acounts[TCP_NSTATES][PRU_NREQ];
#endif

#ifdef TCPSTATES
char *tcpstates[] = {
        "CLOSED",       "LISTEN",       "SYN_SENT",     "SYN_RCVD",
        "ESTABLISHED",  "FIN_WAIT1",    "FIN_WAIT2",    "TIME_WAIT",
        "CLOSE_WAIT",   "CLOSING",      "LAST_ACK",
};
#endif