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Include file changes. No more ../h
[unix-history] / usr / src / sys / netinet / tcp_timer.c
diff --git a/usr/src/sys/netinet/tcp_timer.c b/usr/src/sys/netinet/tcp_timer.c
index 85175e5..e234d7b 100644 (file)
--- a/usr/src/sys/netinet/tcp_timer.c
+++ b/usr/src/sys/netinet/tcp_timer.c
@@ -1,29 +1,48 @@
-/* tcp_timer.c 4.2 81/11/25 */
+/*     tcp_timer.c     6.2     84/08/29        */
+
+#include "param.h"
+#include "systm.h"
+#include "mbuf.h"
+#include "socket.h"
+#include "socketvar.h"
+#include "protosw.h"
+#include "errno.h"
 
 
-#include "../h/param.h"
-#include "../h/systm.h"
-#include "../h/mbuf.h"
-#include "../h/socket.h"
-#include "../h/socketvar.h"
-#include "../h/protosw.h"
-#include "../net/inet.h"
-#include "../net/inet_pcb.h"
-#include "../net/inet_systm.h"
 #include "../net/if.h"
 #include "../net/if.h"
-#include "../net/imp.h"
-#include "../net/ip.h"
-#include "../net/ip_var.h"
-#include "../net/tcp.h"
-#include "../net/tcp_fsm.h"
-#include "../net/tcp_var.h"
-#include "/usr/include/errno.h"
+#include "../net/route.h"
+
+#include "in.h"
+#include "in_pcb.h"
+#include "in_systm.h"
+#include "ip.h"
+#include "ip_var.h"
+#include "tcp.h"
+#include "tcp_fsm.h"
+#include "tcp_seq.h"
+#include "tcp_timer.h"
+#include "tcp_var.h"
+#include "tcpip.h"
 
 
+int    tcpnodelack = 0;
 /*
  * Fast timeout routine for processing delayed acks
  */
 tcp_fasttimo()
 {
 /*
  * Fast timeout routine for processing delayed acks
  */
 tcp_fasttimo()
 {
+       register struct inpcb *inp;
+       register struct tcpcb *tp;
+       int s = splnet();
 
 
+       inp = tcb.inp_next;
+       if (inp)
+       for (; inp != &tcb; inp = inp->inp_next)
+               if ((tp = (struct tcpcb *)inp->inp_ppcb) &&
+                   (tp->t_flags & TF_DELACK)) {
+                       tp->t_flags &= ~TF_DELACK;
+                       tp->t_flags |= TF_ACKNOW;
+                       (void) tcp_output(tp);
+               }
+       splx(s);
 }
 
 /*
 }
 
 /*
@@ -33,27 +52,38 @@ tcp_fasttimo()
  */
 tcp_slowtimo()
 {
  */
 tcp_slowtimo()
 {
-       register struct inpcb *ip;
+       register struct inpcb *ip, *ipnxt;
        register struct tcpcb *tp;
        int s = splnet();
        register struct tcpcb *tp;
        int s = splnet();
-       register short *tmp;
        register int i;
        register int i;
-COUNT(TCP_TIMEO);
 
        /*
         * Search through tcb's and update active timers.
         */
 
        /*
         * Search through tcb's and update active timers.
         */
-       for (ip = tcb.inp_next; ip != &tcb; ip = ip->inp_next) {
+       ip = tcb.inp_next;
+       if (ip == 0) {
+               splx(s);
+               return;
+       }
+       while (ip != &tcb) {
                tp = intotcpcb(ip);
                tp = intotcpcb(ip);
-               tmp = &tp->t_init;
+               if (tp == 0)
+                       continue;
+               ipnxt = ip->inp_next;
                for (i = 0; i < TCPT_NTIMERS; i++) {
                for (i = 0; i < TCPT_NTIMERS; i++) {
-                       if (*tmp && --*tmp == 0)
+                       if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
                                (void) tcp_usrreq(tp->t_inpcb->inp_socket,
                                    PRU_SLOWTIMO, (struct mbuf *)0,
                                (void) tcp_usrreq(tp->t_inpcb->inp_socket,
                                    PRU_SLOWTIMO, (struct mbuf *)0,
-                                   (caddr_t)i);
-                       tmp++;
+                                   (struct mbuf *)i, (struct mbuf *)0);
+                               if (ipnxt->inp_prev != ip)
+                                       goto tpgone;
+                       }
                }
                }
-               tp->t_xmt++;
+               tp->t_idle++;
+               if (tp->t_rtt)
+                       tp->t_rtt++;
+tpgone:
+               ip = ipnxt;
        }
        tcp_iss += TCP_ISSINCR/PR_SLOWHZ;               /* increment iss */
        splx(s);
        }
        tcp_iss += TCP_ISSINCR/PR_SLOWHZ;               /* increment iss */
        splx(s);
@@ -62,7 +92,7 @@ COUNT(TCP_TIMEO);
 /*
  * Cancel all timers for TCP tp.
  */
 /*
  * Cancel all timers for TCP tp.
  */
-tcp_tcancel(tp)
+tcp_canceltimers(tp)
        struct tcpcb *tp;
 {
        register int i;
        struct tcpcb *tp;
 {
        register int i;
@@ -71,35 +101,97 @@ tcp_tcancel(tp)
                tp->t_timer[i] = 0;
 }
 
                tp->t_timer[i] = 0;
 }
 
+float  tcp_backoff[TCP_MAXRXTSHIFT] =
+    { 1.0, 1.2, 1.4, 1.7, 2.0, 3.0, 5.0, 8.0, 16.0, 32.0 };
+int    tcpexprexmtbackoff = 0;
 /*
 /*
- * TCP timer went off processing.
+ * TCP timer processing.
  */
  */
+struct tcpcb *
 tcp_timers(tp, timer)
        register struct tcpcb *tp;
        int timer;
 {
 
 tcp_timers(tp, timer)
        register struct tcpcb *tp;
        int timer;
 {
 
-COUNT(TCP_TIMERS);
-       switch (timertype) {
+       switch (timer) {
 
 
+       /*
+        * 2 MSL timeout in shutdown went off.  Delete connection
+        * control block.
+        */
        case TCPT_2MSL:
        case TCPT_2MSL:
-               tcp_close(tp);
-               return;
+               tp = tcp_close(tp);
+               break;
 
 
+       /*
+        * Retransmission timer went off.  Message has not
+        * been acked within retransmit interval.  Back off
+        * to a longer retransmit interval and retransmit all
+        * unacknowledged messages in the window.
+        */
        case TCPT_REXMT:
        case TCPT_REXMT:
-               tp->t_xmtime <<= 1;
-               if (tp->t_xmtime > TCPT_TOOLONG) {
-                       tcp_drop(tp, ETIMEDOUT);
-                       return;
+               tp->t_rxtshift++;
+               if (tp->t_rxtshift > TCP_MAXRXTSHIFT) {
+                       tp = tcp_drop(tp, ETIMEDOUT);
+                       break;
                }
                }
-               tcp_output(tp);
-               return;
+               TCPT_RANGESET(tp->t_timer[TCPT_REXMT],
+                   (int)tp->t_srtt, TCPTV_MIN, TCPTV_MAX);
+               if (tcpexprexmtbackoff) {
+                       TCPT_RANGESET(tp->t_timer[TCPT_REXMT],
+                           tp->t_timer[TCPT_REXMT] << tp->t_rxtshift,
+                           TCPTV_MIN, TCPTV_MAX);
+               } else {
+                       TCPT_RANGESET(tp->t_timer[TCPT_REXMT],
+                           tp->t_timer[TCPT_REXMT] *
+                               tcp_backoff[tp->t_rxtshift - 1],
+                           TCPTV_MIN, TCPTV_MAX);
+               }
+               tp->snd_nxt = tp->snd_una;
+               /* this only transmits one segment! */
+               (void) tcp_output(tp);
+               break;
 
 
+       /*
+        * Persistance timer into zero window.
+        * Force a byte to be output, if possible.
+        */
        case TCPT_PERSIST:
        case TCPT_PERSIST:
-               if (tcp_output(tp) == 0)
-                       tp->snd_wnd++, (void) tcp_output(tp), tp->snd_wnd--;
+               tcp_setpersist(tp);
+               tp->t_force = 1;
+               (void) tcp_output(tp);
+               tp->t_force = 0;
+               break;
 
 
+       /*
+        * Keep-alive timer went off; send something
+        * or drop connection if idle for too long.
+        */
        case TCPT_KEEP:
        case TCPT_KEEP:
-               return;
+               if (tp->t_state < TCPS_ESTABLISHED)
+                       goto dropit;
+               if (tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) {
+                       if (tp->t_idle >= TCPTV_MAXIDLE)
+                               goto dropit;
+                       /*
+                        * Saying tp->rcv_nxt-1 lies about what
+                        * we have received, and by the protocol spec
+                        * requires the correspondent TCP to respond.
+                        * Saying tp->snd_una-1 causes the transmitted
+                        * byte to lie outside the receive window; this
+                        * is important because we don't necessarily
+                        * have a byte in the window to send (consider
+                        * a one-way stream!)
+                        */
+                       tcp_respond(tp,
+                           tp->t_template, tp->rcv_nxt-1, tp->snd_una-1, 0);
+               } else
+                       tp->t_idle = 0;
+               tp->t_timer[TCPT_KEEP] = TCPTV_KEEP;
+               break;
+       dropit:
+               tp = tcp_drop(tp, ETIMEDOUT);
+               break;
        }
        }
+       return (tp);
 }
 }
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.