* SUCH DAMAGE.
*
* @(#)tcp_timer.c 8.2 (Berkeley) 5/24/95
+ * $FreeBSD: src/sys/netinet/tcp_timer.c,v 1.34.2.11 2001/08/22 00:59:12 silby Exp $
*/
-#if ISFB31
-#include "opt_compat.h"
-#include "opt_tcpdebug.h"
-#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
+#include <sys/mbuf.h>
#include <sys/sysctl.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip6.h>
#include <netinet/in_pcb.h>
+#if INET6
+#include <netinet6/in6_pcb.h>
+#endif
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#define DBG_FNC_TCP_FAST NETDBG_CODE(DBG_NETTCP, (5 << 8))
#define DBG_FNC_TCP_SLOW NETDBG_CODE(DBG_NETTCP, (5 << 8) | 1)
+static int
+sysctl_msec_to_ticks SYSCTL_HANDLER_ARGS
+{
+ int error, s, tt;
-int tcp_keepinit = TCPTV_KEEP_INIT;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
- CTLFLAG_RW, &tcp_keepinit , 0, "");
+ tt = *(int *)oidp->oid_arg1;
+ s = tt * 1000 / hz;
-int tcp_keepidle = TCPTV_KEEP_IDLE;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
- CTLFLAG_RW, &tcp_keepidle , 0, "");
+ error = sysctl_handle_int(oidp, &s, 0, req);
+ if (error || !req->newptr)
+ return (error);
+
+ tt = s * hz / 1000;
+ if (tt < 1)
+ return (EINVAL);
+
+ *(int *)oidp->oid_arg1 = tt;
+ return (0);
+}
-static int tcp_keepintvl = TCPTV_KEEPINTVL;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
- CTLFLAG_RW, &tcp_keepintvl , 0, "");
+int tcp_keepinit;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit, CTLTYPE_INT|CTLFLAG_RW,
+ &tcp_keepinit, 0, sysctl_msec_to_ticks, "I", "");
+
+int tcp_keepidle;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle, CTLTYPE_INT|CTLFLAG_RW,
+ &tcp_keepidle, 0, sysctl_msec_to_ticks, "I", "");
+
+int tcp_keepintvl;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl, CTLTYPE_INT|CTLFLAG_RW,
+ &tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "");
+
+int tcp_delacktime;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_DELACKTIME, delacktime,
+ CTLTYPE_INT|CTLFLAG_RW, &tcp_delacktime, 0, sysctl_msec_to_ticks, "I",
+ "Time before a delayed ACK is sent");
+
+int tcp_msl;
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, msl, CTLTYPE_INT|CTLFLAG_RW,
+ &tcp_msl, 0, sysctl_msec_to_ticks, "I", "Maximum segment lifetime");
static int always_keepalive = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive,
- CTLFLAG_RW, &always_keepalive , 0, "");
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, always_keepalive, CTLFLAG_RW,
+ &always_keepalive , 0, "Assume SO_KEEPALIVE on all TCP connections");
static int tcp_keepcnt = TCPTV_KEEPCNT;
/* max idle probes */
-static int tcp_maxpersistidle = TCPTV_KEEP_IDLE;
+int tcp_maxpersistidle;
/* max idle time in persist */
int tcp_maxidle;
-
-
struct inpcbhead time_wait_slots[N_TIME_WAIT_SLOTS];
int cur_tw_slot = 0;
u_long *delack_bitmask;
-u_long current_active_connections = 0;
-u_long last_active_conn_count = 0;
void add_to_time_wait(tp)
if (tp->t_timer[TCPT_2MSL] == 0)
tp->t_timer[TCPT_2MSL] = 1;
- tp->t_idle += tp->t_timer[TCPT_2MSL] & (N_TIME_WAIT_SLOTS - 1);
+ tp->t_rcvtime += tp->t_timer[TCPT_2MSL] & (N_TIME_WAIT_SLOTS - 1);
tw_slot = (tp->t_timer[TCPT_2MSL] & (N_TIME_WAIT_SLOTS - 1)) + cur_tw_slot;
if (tw_slot >= N_TIME_WAIT_SLOTS)
tw_slot -= N_TIME_WAIT_SLOTS;
if (!tcp_delack_enabled)
return;
- if ((current_active_connections > DELACK_BITMASK_THRESH) &&
- (last_active_conn_count > DELACK_BITMASK_THRESH)) {
- for (i=0; i < (tcbinfo.hashsize / 32); i++) {
+ for (i=0; i < (tcbinfo.hashsize / 32); i++) {
if (delack_bitmask[i]) {
temp_mask = 1;
for (j=0; j < 32; j++) {
delack_bitmask[i] = 0;
}
elem_base += 32;
- }
}
- else
- {
- for (inp = tcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
- if ((tp = (struct tcpcb *)inp->inp_ppcb) &&
- (tp->t_flags & TF_DELACK)) {
- tp->t_flags &= ~TF_DELACK;
- tp->t_flags |= TF_ACKNOW;
- tcpstat.tcps_delack++;
- (void) tcp_output(tp);
- }
- }
- }
-
- last_active_conn_count = current_active_connections;
KERNEL_DEBUG(DBG_FNC_TCP_FAST | DBG_FUNC_END, delack_checked,tcpstat.tcps_delack,0,0,0);
splx(s);
tp = intotcpcb(ip);
if (tp == 0 || tp->t_state == TCPS_LISTEN)
continue;
+ /*
+ * Bogus state when port owned by SharedIP with loopback as the
+ * only configured interface: BlueBox does not filters loopback
+ */
+ if (tp->t_state == TCP_NSTATES)
+ continue;
+
for (i = 0; i < TCPT_NTIMERS; i++) {
if (tp->t_timer[i] && --tp->t_timer[i] == 0) {
#if TCPDEBUG
#endif
}
}
- tp->t_idle++;
- tp->t_duration++;
- if (tp->t_rtt)
- tp->t_rtt++;
+ tp->t_rcvtime++;
+ tp->t_starttime++;
+ if (tp->t_rtttime)
+ tp->t_rtttime++;
tpgone:
;
}
tp = intotcpcb(ip);
if (tp->t_timer[TCPT_2MSL] >= N_TIME_WAIT_SLOTS) {
tp->t_timer[TCPT_2MSL] -= N_TIME_WAIT_SLOTS;
- tp->t_idle += N_TIME_WAIT_SLOTS;
+ tp->t_rcvtime += N_TIME_WAIT_SLOTS;
}
else
tp->t_timer[TCPT_2MSL] = 0;
if (++cur_tw_slot >= N_TIME_WAIT_SLOTS)
cur_tw_slot = 0;
-
-#if TCP_COMPAT_42
- tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */
- if ((int)tcp_iss < 0)
- tcp_iss = TCP_ISSINCR; /* XXX */
-#endif
tcp_now++; /* for timestamps */
splx(s);
KERNEL_DEBUG(DBG_FNC_TCP_SLOW | DBG_FUNC_END, tws_checked, cur_tw_slot,0,0,0);
tp->t_timer[i] = 0;
}
+int tcp_syn_backoff[TCP_MAXRXTSHIFT + 1] =
+ { 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 64, 64 };
+
int tcp_backoff[TCP_MAXRXTSHIFT + 1] =
{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
{
register int rexmt;
struct socket *so_tmp;
+ struct tcptemp *t_template;
+
#if INET6
int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV4) == 0;
#endif /* INET6 */
+
switch (timer) {
/*
*/
case TCPT_2MSL:
if (tp->t_state != TCPS_TIME_WAIT &&
- tp->t_idle <= tcp_maxidle) {
+ tp->t_rcvtime <= tcp_maxidle) {
tp->t_timer[TCPT_2MSL] = tcp_keepintvl;
add_to_time_wait(tp);
}
postevent(so_tmp, 0, EV_TIMEOUT);
break;
}
+
+ if (tp->t_rxtshift == 1) {
+ /*
+ * first retransmit; record ssthresh and cwnd so they can
+ * be recovered if this turns out to be a "bad" retransmit.
+ * A retransmit is considered "bad" if an ACK for this
+ * segment is received within RTT/2 interval; the assumption
+ * here is that the ACK was already in flight. See
+ * "On Estimating End-to-End Network Path Properties" by
+ * Allman and Paxson for more details.
+ */
+ tp->snd_cwnd_prev = tp->snd_cwnd;
+ tp->snd_ssthresh_prev = tp->snd_ssthresh;
+ tp->t_badrxtwin = tcp_now + (tp->t_srtt >> (TCP_RTT_SHIFT + 1));
+ }
tcpstat.tcps_rexmttimeo++;
- rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
+ if (tp->t_state == TCPS_SYN_SENT)
+ rexmt = TCP_REXMTVAL(tp) * tcp_syn_backoff[tp->t_rxtshift];
+ else
+ rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
TCPT_RANGESET(tp->t_rxtcur, rexmt,
- tp->t_rttmin, TCPTV_REXMTMAX);
+ tp->t_rttmin, TCPTV_REXMTMAX);
tp->t_timer[TCPT_REXMT] = tp->t_rxtcur;
+
+ /*
+ * Disable rfc1323 and rfc1644 if we havn't got any response to
+ * our third SYN to work-around some broken terminal servers
+ * (most of which have hopefully been retired) that have bad VJ
+ * header compression code which trashes TCP segments containing
+ * unknown-to-them TCP options.
+ */
+ if ((tp->t_state == TCPS_SYN_SENT) && (tp->t_rxtshift == 3))
+ tp->t_flags &= ~(TF_REQ_SCALE|TF_REQ_TSTMP|TF_REQ_CC);
/*
* If losing, let the lower level know and try for
* a better route. Also, if we backed off this far,
tp->t_srtt = 0;
}
tp->snd_nxt = tp->snd_una;
+ /*
+ * Note: We overload snd_recover to function also as the
+ * snd_last variable described in RFC 2582
+ */
+ tp->snd_recover = tp->snd_max;
/*
* Force a segment to be sent.
*/
/*
* If timing a segment in this window, stop the timer.
*/
- tp->t_rtt = 0;
+ tp->t_rtttime = 0;
/*
* Close the congestion window down to one segment
* (we'll open it by one segment for each ack we get).
* backoff that we would use if retransmitting.
*/
if (tp->t_rxtshift == TCP_MAXRXTSHIFT &&
- (tp->t_idle >= tcp_maxpersistidle ||
- tp->t_idle >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
+ (tp->t_rcvtime >= tcp_maxpersistidle ||
+ tp->t_rcvtime >= TCP_REXMTVAL(tp) * tcp_totbackoff)) {
tcpstat.tcps_persistdrop++;
so_tmp = tp->t_inpcb->inp_socket;
tp = tcp_drop(tp, ETIMEDOUT);
if ((always_keepalive ||
tp->t_inpcb->inp_socket->so_options & SO_KEEPALIVE) &&
tp->t_state <= TCPS_CLOSING) {
- if (tp->t_idle >= tcp_keepidle + tcp_maxidle)
+ if (tp->t_rcvtime >= tcp_keepidle + tcp_maxidle)
goto dropit;
/*
* Send a packet designed to force a response
* correspondent TCP to respond.
*/
tcpstat.tcps_keepprobe++;
-#if TCP_COMPAT_42
- /*
- * The keepalive packet must have nonzero length
- * to get a 4.2 host to respond.
- */
-#if INET6
- if (isipv6)
- tcp_respond(tp, (void *)&tp->t_template->tt_i6,
- &tp->t_template->tt_t,
- (struct mbuf *)NULL,
- tp->rcv_nxt - 1, tp->snd_una - 1,
- 0, isipv6);
- else
-#endif /* INET6 */
- tcp_respond(tp, (void *)&tp->t_template->tt_i,
- &tp->t_template->tt_t, (struct mbuf *)NULL,
- tp->rcv_nxt - 1, tp->snd_una - 1, 0,
- isipv6);
-#else
-#if INET6
- if (isipv6)
- tcp_respond(tp, (void *)&tp->t_template->tt_i6,
- &tp->t_template->tt_t,
- (struct mbuf *)NULL, tp->rcv_nxt,
- tp->snd_una - 1, 0, isipv6);
- else
-#endif /* INET6 */
- tcp_respond(tp, (void *)&tp->t_template->tt_i,
- &tp->t_template->tt_t, (struct mbuf *)NULL,
- tp->rcv_nxt, tp->snd_una - 1, 0, isipv6);
-#endif
+ t_template = tcp_maketemplate(tp);
+ if (t_template) {
+ tcp_respond(tp, t_template->tt_ipgen,
+ &t_template->tt_t, (struct mbuf *)NULL,
+ tp->rcv_nxt, tp->snd_una - 1, 0);
+ (void) m_free(dtom(t_template));
+ }
tp->t_timer[TCPT_KEEP] = tcp_keepintvl;
} else
tp->t_timer[TCPT_KEEP] = tcp_keepidle;
break;
+
+#if TCPDEBUG
+ if (tp->t_inpcb->inp_socket->so_options & SO_DEBUG)
+ tcp_trace(TA_USER, ostate, tp, (void *)0, (struct tcphdr *)0,
+ PRU_SLOWTIMO);
+#endif
dropit:
tcpstat.tcps_keepdrops++;
so_tmp = tp->t_inpcb->inp_socket;
projects / apple / xnu.git / blobdiff