* 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 <sys/protosw.h>
+#include <kern/locks.h>
#include <kern/cpu_number.h> /* before tcp_seq.h, for tcp_random18() */
#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)
+/*
+ * NOTE - WARNING
+ *
+ *
+ *
+ *
+ */
+static int
+sysctl_msec_to_ticks SYSCTL_HANDLER_ARGS
+{
+ int error, s, tt;
+
+ tt = *(int *)oidp->oid_arg1;
+ s = tt * 1000 / hz;
+
+ 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);
+}
+
+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_keepinit = TCPTV_KEEP_INIT;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINIT, keepinit,
- CTLFLAG_RW, &tcp_keepinit , 0, "");
+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_keepidle = TCPTV_KEEP_IDLE;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPIDLE, keepidle,
- CTLFLAG_RW, &tcp_keepidle , 0, "");
+int tcp_keepintvl;
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl, CTLTYPE_INT|CTLFLAG_RW,
+ &tcp_keepintvl, 0, sysctl_msec_to_ticks, "I", "");
-static int tcp_keepintvl = TCPTV_KEEPINTVL;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_KEEPINTVL, keepintvl,
- CTLFLAG_RW, &tcp_keepintvl , 0, "");
+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)
+void add_to_time_wait_locked(tp)
struct tcpcb *tp;
{
int tw_slot;
+ /* pcb list should be locked when we get here */
+#if 0
+ lck_mtx_assert(tp->t_inpcb->inpcb_mtx, LCK_MTX_ASSERT_OWNED);
+#endif
+
LIST_REMOVE(tp->t_inpcb, inp_list);
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;
LIST_INSERT_HEAD(&time_wait_slots[tw_slot], tp->t_inpcb, inp_list);
}
+void add_to_time_wait(tp)
+ struct tcpcb *tp;
+{
+ struct inpcbinfo *pcbinfo = &tcbinfo;
+
+ if (!lck_rw_try_lock_exclusive(pcbinfo->mtx)) {
+ tcp_unlock(tp->t_inpcb->inp_socket, 0, 0);
+ lck_rw_lock_exclusive(pcbinfo->mtx);
+ tcp_lock(tp->t_inpcb->inp_socket, 0, 0);
+ }
+ add_to_time_wait_locked(tp);
+ lck_rw_done(pcbinfo->mtx);
+}
void
tcp_fasttimo()
{
- register struct inpcb *inp;
+ struct inpcb *inp, *inpnxt;
register struct tcpcb *tp;
- register u_long i,j;
- register u_long temp_mask;
- register u_long elem_base = 0;
- struct inpcbhead *head;
- int s = splnet();
+ struct inpcbinfo *pcbinfo = &tcbinfo;
- static
- int delack_checked = 0;
+ int delack_checked = 0, delack_done = 0;
KERNEL_DEBUG(DBG_FNC_TCP_FAST | DBG_FUNC_START, 0,0,0,0,0);
- if (!tcp_delack_enabled)
+ if (tcp_delack_enabled == 0)
return;
- if ((current_active_connections > DELACK_BITMASK_THRESH) &&
- (last_active_conn_count > DELACK_BITMASK_THRESH)) {
- for (i=0; i < (tcbinfo.hashsize / 32); i++) {
- if (delack_bitmask[i]) {
- temp_mask = 1;
- for (j=0; j < 32; j++) {
- if (temp_mask & delack_bitmask[i]) {
- head = &tcbinfo.hashbase[elem_base + j];
- for (inp=head->lh_first; inp != 0; inp = inp->inp_hash.le_next) {
- delack_checked++;
- 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);
- }
- }
- }
- temp_mask <<= 1;
- }
- 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);
- }
- }
- }
+ lck_rw_lock_shared(pcbinfo->mtx);
- 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);
+ /* Walk the list of valid tcpcbs and send ACKS on the ones with DELACK bit set */
+ for (inp = tcb.lh_first; inp != NULL; inp = inpnxt) {
+ inpnxt = inp->inp_list.le_next;
+ /* NOTE: it's OK to check the tp because the pcb can't be removed while we hold pcbinfo->mtx) */
+ if ((tp = (struct tcpcb *)inp->inp_ppcb) && (tp->t_flags & TF_DELACK)) {
+ if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING)
+ continue;
+ tcp_lock(inp->inp_socket, 1, 0);
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
+ tcp_unlock(inp->inp_socket, 1, 0);
+ continue;
+ }
+ if (tp->t_flags & TF_DELACK) {
+ delack_done++;
+ tp->t_flags &= ~TF_DELACK;
+ tp->t_flags |= TF_ACKNOW;
+ tcpstat.tcps_delack++;
+ (void) tcp_output(tp);
+ }
+ tcp_unlock(inp->inp_socket, 1, 0);
+ }
+ }
+ KERNEL_DEBUG(DBG_FNC_TCP_FAST | DBG_FUNC_END, delack_checked, delack_done, tcpstat.tcps_delack,0,0);
+ lck_rw_done(pcbinfo->mtx);
}
/*
void
tcp_slowtimo()
{
- register struct inpcb *ip, *ipnxt;
- register struct tcpcb *tp;
- register int i;
- int s;
+ struct inpcb *inp, *inpnxt;
+ struct tcpcb *tp;
+ struct socket *so;
+ int i;
#if TCPDEBUG
int ostate;
#endif
#if KDEBUG
static int tws_checked;
#endif
+ struct inpcbinfo *pcbinfo = &tcbinfo;
KERNEL_DEBUG(DBG_FNC_TCP_SLOW | DBG_FUNC_START, 0,0,0,0,0);
- s = splnet();
tcp_maxidle = tcp_keepcnt * tcp_keepintvl;
- ip = tcb.lh_first;
- if (ip == NULL) {
- splx(s);
- return;
- }
+ lck_rw_lock_shared(pcbinfo->mtx);
+
/*
* Search through tcb's and update active timers.
*/
- for (; ip != NULL; ip = ipnxt) {
- ipnxt = ip->inp_list.le_next;
- tp = intotcpcb(ip);
- if (tp == 0 || tp->t_state == TCPS_LISTEN)
+ for (inp = tcb.lh_first; inp != NULL; inp = inpnxt) {
+ inpnxt = inp->inp_list.le_next;
+
+ so = inp->inp_socket;
+
+ if (so == &tcbinfo.nat_dummy_socket)
+ continue;
+
+ if (in_pcb_checkstate(inp, WNT_ACQUIRE,0) == WNT_STOPUSING)
continue;
+
+ tcp_lock(so, 1, 0);
+
+ if ((in_pcb_checkstate(inp, WNT_RELEASE,1) == WNT_STOPUSING) && so->so_usecount == 1) {
+ tcp_unlock(so, 1, 0);
+ continue;
+ }
+ tp = intotcpcb(inp);
+ if (tp == 0 || tp->t_state == TCPS_LISTEN) {
+ tcp_unlock(so, 1, 0);
+ 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:
- ;
+ tcp_unlock(so, 1, 0);
}
#if KDEBUG
* Process the items in the current time-wait slot
*/
- for (ip = time_wait_slots[cur_tw_slot].lh_first; ip; ip = ipnxt)
+ for (inp = time_wait_slots[cur_tw_slot].lh_first; inp; inp = inpnxt)
{
+ inpnxt = inp->inp_list.le_next;
#if KDEBUG
tws_checked++;
#endif
- ipnxt = ip->inp_list.le_next;
- tp = intotcpcb(ip);
+
+ if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING)
+ continue;
+
+ tcp_lock(inp->inp_socket, 1, 0);
+
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING)
+ goto twunlock;
+
+ tp = intotcpcb(inp);
+ if (tp == NULL) { /* tp already closed, remove from list */
+#if TEMPDEBUG
+ printf("tcp_slowtimo: tp is null in time-wait slot!\n");
+#endif
+ goto twunlock;
+ }
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 (tp->t_timer[TCPT_2MSL] == 0)
- tp = tcp_timers(tp, TCPT_2MSL);
+ if (tp->t_timer[TCPT_2MSL] == 0)
+ tp = tcp_timers(tp, TCPT_2MSL); /* tp can be returned null if tcp_close is called */
+twunlock:
+ tcp_unlock(inp->inp_socket, 1, 0);
}
- if (++cur_tw_slot >= N_TIME_WAIT_SLOTS)
- cur_tw_slot = 0;
+ if (lck_rw_lock_shared_to_exclusive(pcbinfo->mtx) != 0)
+ lck_rw_lock_exclusive(pcbinfo->mtx); /* Upgrade failed, lost lock no take it again exclusive */
+
- tcp_iss += TCP_ISSINCR/PR_SLOWHZ; /* increment iss */
-#if TCP_COMPAT_42
- if ((int)tcp_iss < 0)
- tcp_iss = TCP_ISSINCR; /* XXX */
+ for (inp = tcb.lh_first; inp != NULL; inp = inpnxt) {
+ inpnxt = inp->inp_list.le_next;
+ /* Ignore nat/SharedIP dummy pcbs */
+ if (inp->inp_socket == &tcbinfo.nat_dummy_socket)
+ continue;
+
+ if (inp->inp_wantcnt != WNT_STOPUSING)
+ continue;
+
+ so = inp->inp_socket;
+ if (!lck_mtx_try_lock(inp->inpcb_mtx)) {/* skip if in use */
+#if TEMPDEBUG
+ printf("tcp_slowtimo so=%x STOPUSING but locked...\n", so);
#endif
- tcp_now++; /* for timestamps */
- splx(s);
+ continue;
+ }
+
+ if (so->so_usecount == 0)
+ in_pcbdispose(inp);
+ else {
+ tp = intotcpcb(inp);
+ /* Check for embryonic socket stuck on listener queue (4023660) */
+ if ((so->so_usecount == 1) && (tp->t_state == TCPS_CLOSED) &&
+ (so->so_head != NULL) && (so->so_state & SS_INCOMP)) {
+ so->so_usecount--;
+ in_pcbdispose(inp);
+ } else
+ lck_mtx_unlock(inp->inpcb_mtx);
+ }
+ }
+
+ /* Now cleanup the time wait ones */
+ for (inp = time_wait_slots[cur_tw_slot].lh_first; inp; inp = inpnxt)
+ {
+ inpnxt = inp->inp_list.le_next;
+
+ if (inp->inp_wantcnt != WNT_STOPUSING)
+ continue;
+
+ so = inp->inp_socket;
+ if (!lck_mtx_try_lock(inp->inpcb_mtx)) /* skip if in use */
+ continue;
+ if (so->so_usecount == 0)
+ in_pcbdispose(inp);
+ else {
+ tp = intotcpcb(inp);
+ /* Check for embryonic socket stuck on listener queue (4023660) */
+ if ((so->so_usecount == 1) && (tp->t_state == TCPS_CLOSED) &&
+ (so->so_head != NULL) && (so->so_state & SS_INCOMP)) {
+ so->so_usecount--;
+ in_pcbdispose(inp);
+ } else
+ lck_mtx_unlock(inp->inpcb_mtx);
+ }
+ }
+
+ tcp_now++;
+ if (++cur_tw_slot >= N_TIME_WAIT_SLOTS)
+ cur_tw_slot = 0;
+
+ lck_rw_done(pcbinfo->mtx);
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 TCPDEBUG
+ int ostate;
+#endif
+
#if INET6
int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV4) == 0;
#endif /* INET6 */
+ so_tmp = tp->t_inpcb->inp_socket;
+
switch (timer) {
/*
* control block. Otherwise, check again in a bit.
*/
case TCPT_2MSL:
+ tcp_free_sackholes(tp);
if (tp->t_state != TCPS_TIME_WAIT &&
- tp->t_idle <= tcp_maxidle) {
- tp->t_timer[TCPT_2MSL] = tcp_keepintvl;
- add_to_time_wait(tp);
+ tp->t_rcvtime <= tcp_maxidle) {
+ tp->t_timer[TCPT_2MSL] = (unsigned long)tcp_keepintvl;
+ add_to_time_wait_locked(tp);
}
- else
+ else {
tp = tcp_close(tp);
+ return(tp);
+ }
break;
/*
* to a longer retransmit interval and retransmit one segment.
*/
case TCPT_REXMT:
+ tcp_free_sackholes(tp);
if (++tp->t_rxtshift > TCP_MAXRXTSHIFT) {
tp->t_rxtshift = TCP_MAXRXTSHIFT;
tcpstat.tcps_timeoutdrop++;
- so_tmp = tp->t_inpcb->inp_socket;
tp = tcp_drop(tp, tp->t_softerror ?
tp->t_softerror : ETIMEDOUT);
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->snd_recover_prev = tp->snd_recover;
+ if (IN_FASTRECOVERY(tp))
+ tp->t_flags |= TF_WASFRECOVERY;
+ else
+ tp->t_flags &= ~TF_WASFRECOVERY;
+ 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).
tp->snd_ssthresh = win * tp->t_maxseg;
tp->t_dupacks = 0;
}
+ EXIT_FASTRECOVERY(tp);
(void) tcp_output(tp);
break;
* 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);
goto dropit;
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)
+ tp->t_state <= TCPS_CLOSING || tp->t_state == TCPS_FIN_WAIT_2) {
+ if (tp->t_rcvtime >= TCP_KEEPIDLE(tp) + (unsigned long)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;
+ tp->t_timer[TCPT_KEEP] = TCP_KEEPIDLE(tp);
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;
tp = tcp_drop(tp, ETIMEDOUT);
postevent(so_tmp, 0, EV_TIMEOUT);
break;
projects / apple / xnu.git / blobdiff