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-rwxr-xr-xnetwerk/sctp/src/netinet/sctp_timer.c1603
1 files changed, 1603 insertions, 0 deletions
diff --git a/netwerk/sctp/src/netinet/sctp_timer.c b/netwerk/sctp/src/netinet/sctp_timer.c
new file mode 100755
index 000000000..48ad45902
--- /dev/null
+++ b/netwerk/sctp/src/netinet/sctp_timer.c
@@ -0,0 +1,1603 @@
+/*-
+ * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * b) Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the distribution.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef __FreeBSD__
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/netinet/sctp_timer.c 279841 2015-03-10 09:16:31Z tuexen $");
+#endif
+
+#define _IP_VHL
+#include <netinet/sctp_os.h>
+#include <netinet/sctp_pcb.h>
+#ifdef INET6
+#if defined(__Userspace_os_FreeBSD)
+#include <netinet6/sctp6_var.h>
+#endif
+#endif
+#include <netinet/sctp_var.h>
+#include <netinet/sctp_sysctl.h>
+#include <netinet/sctp_timer.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_output.h>
+#include <netinet/sctp_header.h>
+#include <netinet/sctp_indata.h>
+#include <netinet/sctp_asconf.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp.h>
+#include <netinet/sctp_uio.h>
+#if defined(INET) || defined(INET6)
+#if !defined(__Userspace_os_Windows)
+#include <netinet/udp.h>
+#endif
+#endif
+
+#if defined(__APPLE__)
+#define APPLE_FILE_NO 6
+#endif
+
+void
+sctp_audit_retranmission_queue(struct sctp_association *asoc)
+{
+ struct sctp_tmit_chunk *chk;
+
+ SCTPDBG(SCTP_DEBUG_TIMER4, "Audit invoked on send queue cnt:%d onqueue:%d\n",
+ asoc->sent_queue_retran_cnt,
+ asoc->sent_queue_cnt);
+ asoc->sent_queue_retran_cnt = 0;
+ asoc->sent_queue_cnt = 0;
+ TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
+ if (chk->sent == SCTP_DATAGRAM_RESEND) {
+ sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+ }
+ asoc->sent_queue_cnt++;
+ }
+ TAILQ_FOREACH(chk, &asoc->control_send_queue, sctp_next) {
+ if (chk->sent == SCTP_DATAGRAM_RESEND) {
+ sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+ }
+ }
+ TAILQ_FOREACH(chk, &asoc->asconf_send_queue, sctp_next) {
+ if (chk->sent == SCTP_DATAGRAM_RESEND) {
+ sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+ }
+ }
+ SCTPDBG(SCTP_DEBUG_TIMER4, "Audit completes retran:%d onqueue:%d\n",
+ asoc->sent_queue_retran_cnt,
+ asoc->sent_queue_cnt);
+}
+
+int
+sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net, uint16_t threshold)
+{
+ if (net) {
+ net->error_count++;
+ SCTPDBG(SCTP_DEBUG_TIMER4, "Error count for %p now %d thresh:%d\n",
+ (void *)net, net->error_count,
+ net->failure_threshold);
+ if (net->error_count > net->failure_threshold) {
+ /* We had a threshold failure */
+ if (net->dest_state & SCTP_ADDR_REACHABLE) {
+ net->dest_state &= ~SCTP_ADDR_REACHABLE;
+ net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
+ net->dest_state &= ~SCTP_ADDR_PF;
+ sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
+ stcb, 0,
+ (void *)net, SCTP_SO_NOT_LOCKED);
+ }
+ } else if ((net->pf_threshold < net->failure_threshold) &&
+ (net->error_count > net->pf_threshold)) {
+ if (!(net->dest_state & SCTP_ADDR_PF)) {
+ net->dest_state |= SCTP_ADDR_PF;
+ net->last_active = sctp_get_tick_count();
+ sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+ sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_TIMER + SCTP_LOC_3);
+ sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
+ }
+ }
+ }
+ if (stcb == NULL)
+ return (0);
+
+ if (net) {
+ if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_INCR,
+ stcb->asoc.overall_error_count,
+ (stcb->asoc.overall_error_count+1),
+ SCTP_FROM_SCTP_TIMER,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count++;
+ }
+ } else {
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+ sctp_misc_ints(SCTP_THRESHOLD_INCR,
+ stcb->asoc.overall_error_count,
+ (stcb->asoc.overall_error_count+1),
+ SCTP_FROM_SCTP_TIMER,
+ __LINE__);
+ }
+ stcb->asoc.overall_error_count++;
+ }
+ SCTPDBG(SCTP_DEBUG_TIMER4, "Overall error count for %p now %d thresh:%u state:%x\n",
+ (void *)&stcb->asoc, stcb->asoc.overall_error_count,
+ (uint32_t)threshold,
+ ((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
+ /*
+ * We specifically do not do >= to give the assoc one more change
+ * before we fail it.
+ */
+ if (stcb->asoc.overall_error_count > threshold) {
+ /* Abort notification sends a ULP notify */
+ struct mbuf *op_err;
+
+ op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
+ "Association error counter exceeded");
+ inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_1;
+ sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
+ return (1);
+ }
+ return (0);
+}
+
+/*
+ * sctp_find_alternate_net() returns a non-NULL pointer as long
+ * the argument net is non-NULL.
+ */
+struct sctp_nets *
+sctp_find_alternate_net(struct sctp_tcb *stcb,
+ struct sctp_nets *net,
+ int mode)
+{
+ /* Find and return an alternate network if possible */
+ struct sctp_nets *alt, *mnet, *min_errors_net = NULL , *max_cwnd_net = NULL;
+ int once;
+ /* JRS 5/14/07 - Initialize min_errors to an impossible value. */
+ int min_errors = -1;
+ uint32_t max_cwnd = 0;
+
+ if (stcb->asoc.numnets == 1) {
+ /* No others but net */
+ return (TAILQ_FIRST(&stcb->asoc.nets));
+ }
+ /*
+ * JRS 5/14/07 - If mode is set to 2, use the CMT PF find alternate net algorithm.
+ * This algorithm chooses the active destination (not in PF state) with the largest
+ * cwnd value. If all destinations are in PF state, unreachable, or unconfirmed, choose
+ * the desination that is in PF state with the lowest error count. In case of a tie,
+ * choose the destination that was most recently active.
+ */
+ if (mode == 2) {
+ TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
+ /* JRS 5/14/07 - If the destination is unreachable or unconfirmed, skip it. */
+ if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
+ (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
+ continue;
+ }
+ /*
+ * JRS 5/14/07 - If the destination is reachable but in PF state, compare
+ * the error count of the destination to the minimum error count seen thus far.
+ * Store the destination with the lower error count. If the error counts are
+ * equal, store the destination that was most recently active.
+ */
+ if (mnet->dest_state & SCTP_ADDR_PF) {
+ /*
+ * JRS 5/14/07 - If the destination under consideration is the current
+ * destination, work as if the error count is one higher. The
+ * actual error count will not be incremented until later in the
+ * t3 handler.
+ */
+ if (mnet == net) {
+ if (min_errors == -1) {
+ min_errors = mnet->error_count + 1;
+ min_errors_net = mnet;
+ } else if (mnet->error_count + 1 < min_errors) {
+ min_errors = mnet->error_count + 1;
+ min_errors_net = mnet;
+ } else if (mnet->error_count + 1 == min_errors
+ && mnet->last_active > min_errors_net->last_active) {
+ min_errors_net = mnet;
+ min_errors = mnet->error_count + 1;
+ }
+ continue;
+ } else {
+ if (min_errors == -1) {
+ min_errors = mnet->error_count;
+ min_errors_net = mnet;
+ } else if (mnet->error_count < min_errors) {
+ min_errors = mnet->error_count;
+ min_errors_net = mnet;
+ } else if (mnet->error_count == min_errors
+ && mnet->last_active > min_errors_net->last_active) {
+ min_errors_net = mnet;
+ min_errors = mnet->error_count;
+ }
+ continue;
+ }
+ }
+ /*
+ * JRS 5/14/07 - If the destination is reachable and not in PF state, compare the
+ * cwnd of the destination to the highest cwnd seen thus far. Store the
+ * destination with the higher cwnd value. If the cwnd values are equal,
+ * randomly choose one of the two destinations.
+ */
+ if (max_cwnd < mnet->cwnd) {
+ max_cwnd_net = mnet;
+ max_cwnd = mnet->cwnd;
+ } else if (max_cwnd == mnet->cwnd) {
+ uint32_t rndval;
+ uint8_t this_random;
+
+ if (stcb->asoc.hb_random_idx > 3) {
+ rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
+ memcpy(stcb->asoc.hb_random_values, &rndval, sizeof(stcb->asoc.hb_random_values));
+ this_random = stcb->asoc.hb_random_values[0];
+ stcb->asoc.hb_random_idx++;
+ stcb->asoc.hb_ect_randombit = 0;
+ } else {
+ this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
+ stcb->asoc.hb_random_idx++;
+ stcb->asoc.hb_ect_randombit = 0;
+ }
+ if (this_random % 2 == 1) {
+ max_cwnd_net = mnet;
+ max_cwnd = mnet->cwnd; /* Useless? */
+ }
+ }
+ }
+ if (max_cwnd_net == NULL) {
+ if (min_errors_net == NULL) {
+ return (net);
+ }
+ return (min_errors_net);
+ } else {
+ return (max_cwnd_net);
+ }
+ } /* JRS 5/14/07 - If mode is set to 1, use the CMT policy for choosing an alternate net. */
+ else if (mode == 1) {
+ TAILQ_FOREACH(mnet, &stcb->asoc.nets, sctp_next) {
+ if (((mnet->dest_state & SCTP_ADDR_REACHABLE) != SCTP_ADDR_REACHABLE) ||
+ (mnet->dest_state & SCTP_ADDR_UNCONFIRMED)) {
+ /*
+ * will skip ones that are not-reachable or
+ * unconfirmed
+ */
+ continue;
+ }
+ if (max_cwnd < mnet->cwnd) {
+ max_cwnd_net = mnet;
+ max_cwnd = mnet->cwnd;
+ } else if (max_cwnd == mnet->cwnd) {
+ uint32_t rndval;
+ uint8_t this_random;
+
+ if (stcb->asoc.hb_random_idx > 3) {
+ rndval = sctp_select_initial_TSN(&stcb->sctp_ep->sctp_ep);
+ memcpy(stcb->asoc.hb_random_values, &rndval,
+ sizeof(stcb->asoc.hb_random_values));
+ this_random = stcb->asoc.hb_random_values[0];
+ stcb->asoc.hb_random_idx = 0;
+ stcb->asoc.hb_ect_randombit = 0;
+ } else {
+ this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
+ stcb->asoc.hb_random_idx++;
+ stcb->asoc.hb_ect_randombit = 0;
+ }
+ if (this_random % 2) {
+ max_cwnd_net = mnet;
+ max_cwnd = mnet->cwnd;
+ }
+ }
+ }
+ if (max_cwnd_net) {
+ return (max_cwnd_net);
+ }
+ }
+ mnet = net;
+ once = 0;
+
+ if (mnet == NULL) {
+ mnet = TAILQ_FIRST(&stcb->asoc.nets);
+ if (mnet == NULL) {
+ return (NULL);
+ }
+ }
+ for (;;) {
+ alt = TAILQ_NEXT(mnet, sctp_next);
+ if (alt == NULL) {
+ once++;
+ if (once > 1) {
+ break;
+ }
+ alt = TAILQ_FIRST(&stcb->asoc.nets);
+ if (alt == NULL) {
+ return (NULL);
+ }
+ }
+ if (alt->ro.ro_rt == NULL) {
+ if (alt->ro._s_addr) {
+ sctp_free_ifa(alt->ro._s_addr);
+ alt->ro._s_addr = NULL;
+ }
+ alt->src_addr_selected = 0;
+ }
+ if (((alt->dest_state & SCTP_ADDR_REACHABLE) == SCTP_ADDR_REACHABLE) &&
+ (alt->ro.ro_rt != NULL) &&
+ (!(alt->dest_state & SCTP_ADDR_UNCONFIRMED))) {
+ /* Found a reachable address */
+ break;
+ }
+ mnet = alt;
+ }
+
+ if (alt == NULL) {
+ /* Case where NO insv network exists (dormant state) */
+ /* we rotate destinations */
+ once = 0;
+ mnet = net;
+ for (;;) {
+ if (mnet == NULL) {
+ return (TAILQ_FIRST(&stcb->asoc.nets));
+ }
+ alt = TAILQ_NEXT(mnet, sctp_next);
+ if (alt == NULL) {
+ once++;
+ if (once > 1) {
+ break;
+ }
+ alt = TAILQ_FIRST(&stcb->asoc.nets);
+ if (alt == NULL) {
+ break;
+ }
+ }
+ if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
+ (alt != net)) {
+ /* Found an alternate address */
+ break;
+ }
+ mnet = alt;
+ }
+ }
+ if (alt == NULL) {
+ return (net);
+ }
+ return (alt);
+}
+
+static void
+sctp_backoff_on_timeout(struct sctp_tcb *stcb,
+ struct sctp_nets *net,
+ int win_probe,
+ int num_marked, int num_abandoned)
+{
+ if (net->RTO == 0) {
+ net->RTO = stcb->asoc.minrto;
+ }
+ net->RTO <<= 1;
+ if (net->RTO > stcb->asoc.maxrto) {
+ net->RTO = stcb->asoc.maxrto;
+ }
+ if ((win_probe == 0) && (num_marked || num_abandoned)) {
+ /* We don't apply penalty to window probe scenarios */
+ /* JRS - Use the congestion control given in the CC module */
+ stcb->asoc.cc_functions.sctp_cwnd_update_after_timeout(stcb, net);
+ }
+}
+
+#ifndef INVARIANTS
+static void
+sctp_recover_sent_list(struct sctp_tcb *stcb)
+{
+ struct sctp_tmit_chunk *chk, *nchk;
+ struct sctp_association *asoc;
+
+ asoc = &stcb->asoc;
+ TAILQ_FOREACH_SAFE(chk, &asoc->sent_queue, sctp_next, nchk) {
+ if (SCTP_TSN_GE(asoc->last_acked_seq, chk->rec.data.TSN_seq)) {
+ SCTP_PRINTF("Found chk:%p tsn:%x <= last_acked_seq:%x\n",
+ (void *)chk, chk->rec.data.TSN_seq, asoc->last_acked_seq);
+ if (chk->sent != SCTP_DATAGRAM_NR_ACKED) {
+ if (asoc->strmout[chk->rec.data.stream_number].chunks_on_queues > 0) {
+ asoc->strmout[chk->rec.data.stream_number].chunks_on_queues--;
+ }
+ }
+ TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
+ if (PR_SCTP_ENABLED(chk->flags)) {
+ if (asoc->pr_sctp_cnt != 0)
+ asoc->pr_sctp_cnt--;
+ }
+ if (chk->data) {
+ /*sa_ignore NO_NULL_CHK*/
+ sctp_free_bufspace(stcb, asoc, chk, 1);
+ sctp_m_freem(chk->data);
+ chk->data = NULL;
+ if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(chk->flags)) {
+ asoc->sent_queue_cnt_removeable--;
+ }
+ }
+ asoc->sent_queue_cnt--;
+ sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+ }
+ }
+ SCTP_PRINTF("after recover order is as follows\n");
+ TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
+ SCTP_PRINTF("chk:%p TSN:%x\n", (void *)chk, chk->rec.data.TSN_seq);
+ }
+}
+#endif
+
+static int
+sctp_mark_all_for_resend(struct sctp_tcb *stcb,
+ struct sctp_nets *net,
+ struct sctp_nets *alt,
+ int window_probe,
+ int *num_marked,
+ int *num_abandoned)
+{
+
+ /*
+ * Mark all chunks (well not all) that were sent to *net for
+ * retransmission. Move them to alt for there destination as well...
+ * We only mark chunks that have been outstanding long enough to
+ * have received feed-back.
+ */
+ struct sctp_tmit_chunk *chk, *nchk;
+ struct sctp_nets *lnets;
+ struct timeval now, min_wait, tv;
+ int cur_rto;
+ int cnt_abandoned;
+ int audit_tf, num_mk, fir;
+ unsigned int cnt_mk;
+ uint32_t orig_flight, orig_tf;
+ uint32_t tsnlast, tsnfirst;
+ int recovery_cnt = 0;
+
+
+ /* none in flight now */
+ audit_tf = 0;
+ fir = 0;
+ /*
+ * figure out how long a data chunk must be pending before we can
+ * mark it ..
+ */
+ (void)SCTP_GETTIME_TIMEVAL(&now);
+ /* get cur rto in micro-seconds */
+ cur_rto = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
+ cur_rto *= 1000;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(cur_rto,
+ stcb->asoc.peers_rwnd,
+ window_probe,
+ SCTP_FR_T3_MARK_TIME);
+ sctp_log_fr(net->flight_size, 0, 0, SCTP_FR_CWND_REPORT);
+ sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
+ }
+ tv.tv_sec = cur_rto / 1000000;
+ tv.tv_usec = cur_rto % 1000000;
+#ifndef __FreeBSD__
+ timersub(&now, &tv, &min_wait);
+#else
+ min_wait = now;
+ timevalsub(&min_wait, &tv);
+#endif
+ if (min_wait.tv_sec < 0 || min_wait.tv_usec < 0) {
+ /*
+ * if we hit here, we don't have enough seconds on the clock
+ * to account for the RTO. We just let the lower seconds be
+ * the bounds and don't worry about it. This may mean we
+ * will mark a lot more than we should.
+ */
+ min_wait.tv_sec = min_wait.tv_usec = 0;
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(cur_rto, now.tv_sec, now.tv_usec, SCTP_FR_T3_MARK_TIME);
+ sctp_log_fr(0, min_wait.tv_sec, min_wait.tv_usec, SCTP_FR_T3_MARK_TIME);
+ }
+ /*
+ * Our rwnd will be incorrect here since we are not adding back the
+ * cnt * mbuf but we will fix that down below.
+ */
+ orig_flight = net->flight_size;
+ orig_tf = stcb->asoc.total_flight;
+
+ net->fast_retran_ip = 0;
+ /* Now on to each chunk */
+ cnt_abandoned = 0;
+ num_mk = cnt_mk = 0;
+ tsnfirst = tsnlast = 0;
+#ifndef INVARIANTS
+ start_again:
+#endif
+ TAILQ_FOREACH_SAFE(chk, &stcb->asoc.sent_queue, sctp_next, nchk) {
+ if (SCTP_TSN_GE(stcb->asoc.last_acked_seq, chk->rec.data.TSN_seq)) {
+ /* Strange case our list got out of order? */
+ SCTP_PRINTF("Our list is out of order? last_acked:%x chk:%x\n",
+ (unsigned int)stcb->asoc.last_acked_seq, (unsigned int)chk->rec.data.TSN_seq);
+ recovery_cnt++;
+#ifdef INVARIANTS
+ panic("last acked >= chk on sent-Q");
+#else
+ SCTP_PRINTF("Recover attempts a restart cnt:%d\n", recovery_cnt);
+ sctp_recover_sent_list(stcb);
+ if (recovery_cnt < 10) {
+ goto start_again;
+ } else {
+ SCTP_PRINTF("Recovery fails %d times??\n", recovery_cnt);
+ }
+#endif
+ }
+ if ((chk->whoTo == net) && (chk->sent < SCTP_DATAGRAM_ACKED)) {
+ /*
+ * found one to mark: If it is less than
+ * DATAGRAM_ACKED it MUST not be a skipped or marked
+ * TSN but instead one that is either already set
+ * for retransmission OR one that needs
+ * retransmission.
+ */
+
+ /* validate its been outstanding long enough */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(chk->rec.data.TSN_seq,
+ chk->sent_rcv_time.tv_sec,
+ chk->sent_rcv_time.tv_usec,
+ SCTP_FR_T3_MARK_TIME);
+ }
+ if ((chk->sent_rcv_time.tv_sec > min_wait.tv_sec) && (window_probe == 0)) {
+ /*
+ * we have reached a chunk that was sent
+ * some seconds past our min.. forget it we
+ * will find no more to send.
+ */
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(0,
+ chk->sent_rcv_time.tv_sec,
+ chk->sent_rcv_time.tv_usec,
+ SCTP_FR_T3_STOPPED);
+ }
+ continue;
+ } else if ((chk->sent_rcv_time.tv_sec == min_wait.tv_sec) &&
+ (window_probe == 0)) {
+ /*
+ * we must look at the micro seconds to
+ * know.
+ */
+ if (chk->sent_rcv_time.tv_usec >= min_wait.tv_usec) {
+ /*
+ * ok it was sent after our boundary
+ * time.
+ */
+ continue;
+ }
+ }
+ if (stcb->asoc.prsctp_supported && PR_SCTP_TTL_ENABLED(chk->flags)) {
+ /* Is it expired? */
+#ifndef __FreeBSD__
+ if (timercmp(&now, &chk->rec.data.timetodrop, >)) {
+#else
+ if (timevalcmp(&now, &chk->rec.data.timetodrop, >)) {
+#endif
+ /* Yes so drop it */
+ if (chk->data) {
+ (void)sctp_release_pr_sctp_chunk(stcb,
+ chk,
+ 1,
+ SCTP_SO_NOT_LOCKED);
+ cnt_abandoned++;
+ }
+ continue;
+ }
+ }
+ if (stcb->asoc.prsctp_supported && PR_SCTP_RTX_ENABLED(chk->flags)) {
+ /* Has it been retransmitted tv_sec times? */
+ if (chk->snd_count > chk->rec.data.timetodrop.tv_sec) {
+ if (chk->data) {
+ (void)sctp_release_pr_sctp_chunk(stcb,
+ chk,
+ 1,
+ SCTP_SO_NOT_LOCKED);
+ cnt_abandoned++;
+ }
+ continue;
+ }
+ }
+ if (chk->sent < SCTP_DATAGRAM_RESEND) {
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ num_mk++;
+ if (fir == 0) {
+ fir = 1;
+ tsnfirst = chk->rec.data.TSN_seq;
+ }
+ tsnlast = chk->rec.data.TSN_seq;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
+ 0, SCTP_FR_T3_MARKED);
+ }
+
+ if (chk->rec.data.chunk_was_revoked) {
+ /* deflate the cwnd */
+ chk->whoTo->cwnd -= chk->book_size;
+ chk->rec.data.chunk_was_revoked = 0;
+ }
+ net->marked_retrans++;
+ stcb->asoc.marked_retrans++;
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+ sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND_TO,
+ chk->whoTo->flight_size,
+ chk->book_size,
+ (uintptr_t)chk->whoTo,
+ chk->rec.data.TSN_seq);
+ }
+ sctp_flight_size_decrease(chk);
+ sctp_total_flight_decrease(stcb, chk);
+ stcb->asoc.peers_rwnd += chk->send_size;
+ stcb->asoc.peers_rwnd += SCTP_BASE_SYSCTL(sctp_peer_chunk_oh);
+ }
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ SCTP_STAT_INCR(sctps_markedretrans);
+
+ /* reset the TSN for striking and other FR stuff */
+ chk->rec.data.doing_fast_retransmit = 0;
+ /* Clear any time so NO RTT is being done */
+
+ if (chk->do_rtt) {
+ if (chk->whoTo->rto_needed == 0) {
+ chk->whoTo->rto_needed = 1;
+ }
+ }
+ chk->do_rtt = 0;
+ if (alt != net) {
+ sctp_free_remote_addr(chk->whoTo);
+ chk->no_fr_allowed = 1;
+ chk->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+ } else {
+ chk->no_fr_allowed = 0;
+ if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
+ chk->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
+ } else {
+ chk->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.TSN_seq;
+ }
+ }
+ /* CMT: Do not allow FRs on retransmitted TSNs.
+ */
+ if (stcb->asoc.sctp_cmt_on_off > 0) {
+ chk->no_fr_allowed = 1;
+ }
+#ifdef THIS_SHOULD_NOT_BE_DONE
+ } else if (chk->sent == SCTP_DATAGRAM_ACKED) {
+ /* remember highest acked one */
+ could_be_sent = chk;
+#endif
+ }
+ if (chk->sent == SCTP_DATAGRAM_RESEND) {
+ cnt_mk++;
+ }
+ }
+ if ((orig_flight - net->flight_size) != (orig_tf - stcb->asoc.total_flight)) {
+ /* we did not subtract the same things? */
+ audit_tf = 1;
+ }
+
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
+ }
+#ifdef SCTP_DEBUG
+ if (num_mk) {
+ SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
+ tsnlast);
+ SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%ld\n",
+ num_mk, (u_long)stcb->asoc.peers_rwnd);
+ SCTPDBG(SCTP_DEBUG_TIMER1, "LAST TSN marked was %x\n",
+ tsnlast);
+ SCTPDBG(SCTP_DEBUG_TIMER1, "Num marked for retransmission was %d peer-rwd:%d\n",
+ num_mk,
+ (int)stcb->asoc.peers_rwnd);
+ }
+#endif
+ *num_marked = num_mk;
+ *num_abandoned = cnt_abandoned;
+ /* Now check for a ECN Echo that may be stranded And
+ * include the cnt_mk'd to have all resends in the
+ * control queue.
+ */
+ TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
+ if (chk->sent == SCTP_DATAGRAM_RESEND) {
+ cnt_mk++;
+ }
+ if ((chk->whoTo == net) &&
+ (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
+ sctp_free_remote_addr(chk->whoTo);
+ chk->whoTo = alt;
+ if (chk->sent != SCTP_DATAGRAM_RESEND) {
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ cnt_mk++;
+ }
+ atomic_add_int(&alt->ref_count, 1);
+ }
+ }
+#ifdef THIS_SHOULD_NOT_BE_DONE
+ if ((stcb->asoc.sent_queue_retran_cnt == 0) && (could_be_sent)) {
+ /* fix it so we retransmit the highest acked anyway */
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ cnt_mk++;
+ could_be_sent->sent = SCTP_DATAGRAM_RESEND;
+ }
+#endif
+ if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
+#ifdef INVARIANTS
+ SCTP_PRINTF("Local Audit says there are %d for retran asoc cnt:%d we marked:%d this time\n",
+ cnt_mk, stcb->asoc.sent_queue_retran_cnt, num_mk);
+#endif
+#ifndef SCTP_AUDITING_ENABLED
+ stcb->asoc.sent_queue_retran_cnt = cnt_mk;
+#endif
+ }
+ if (audit_tf) {
+ SCTPDBG(SCTP_DEBUG_TIMER4,
+ "Audit total flight due to negative value net:%p\n",
+ (void *)net);
+ stcb->asoc.total_flight = 0;
+ stcb->asoc.total_flight_count = 0;
+ /* Clear all networks flight size */
+ TAILQ_FOREACH(lnets, &stcb->asoc.nets, sctp_next) {
+ lnets->flight_size = 0;
+ SCTPDBG(SCTP_DEBUG_TIMER4,
+ "Net:%p c-f cwnd:%d ssthresh:%d\n",
+ (void *)lnets, lnets->cwnd, lnets->ssthresh);
+ }
+ TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
+ if (chk->sent < SCTP_DATAGRAM_RESEND) {
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+ sctp_misc_ints(SCTP_FLIGHT_LOG_UP,
+ chk->whoTo->flight_size,
+ chk->book_size,
+ (uintptr_t)chk->whoTo,
+ chk->rec.data.TSN_seq);
+ }
+
+ sctp_flight_size_increase(chk);
+ sctp_total_flight_increase(stcb, chk);
+ }
+ }
+ }
+ /* We return 1 if we only have a window probe outstanding */
+ return (0);
+}
+
+
+int
+sctp_t3rxt_timer(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_nets *alt;
+ int win_probe, num_mk, num_abandoned;
+
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+ sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
+ struct sctp_nets *lnet;
+
+ TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
+ if (net == lnet) {
+ sctp_log_cwnd(stcb, lnet, 1, SCTP_CWND_LOG_FROM_T3);
+ } else {
+ sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_LOG_FROM_T3);
+ }
+ }
+ }
+ /* Find an alternate and mark those for retransmission */
+ if ((stcb->asoc.peers_rwnd == 0) &&
+ (stcb->asoc.total_flight < net->mtu)) {
+ SCTP_STAT_INCR(sctps_timowindowprobe);
+ win_probe = 1;
+ } else {
+ win_probe = 0;
+ }
+
+ if (win_probe == 0) {
+ /* We don't do normal threshold management on window probes */
+ if (sctp_threshold_management(inp, stcb, net,
+ stcb->asoc.max_send_times)) {
+ /* Association was destroyed */
+ return (1);
+ } else {
+ if (net != stcb->asoc.primary_destination) {
+ /* send a immediate HB if our RTO is stale */
+ struct timeval now;
+ unsigned int ms_goneby;
+
+ (void)SCTP_GETTIME_TIMEVAL(&now);
+ if (net->last_sent_time.tv_sec) {
+ ms_goneby = (now.tv_sec - net->last_sent_time.tv_sec) * 1000;
+ } else {
+ ms_goneby = 0;
+ }
+ if ((net->dest_state & SCTP_ADDR_PF) == 0) {
+ if ((ms_goneby > net->RTO) || (net->RTO == 0)) {
+ /*
+ * no recent feed back in an RTO or
+ * more, request a RTT update
+ */
+ sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+ }
+ }
+ }
+ }
+ } else {
+ /*
+ * For a window probe we don't penalize the net's but only
+ * the association. This may fail it if SACKs are not coming
+ * back. If sack's are coming with rwnd locked at 0, we will
+ * continue to hold things waiting for rwnd to raise
+ */
+ if (sctp_threshold_management(inp, stcb, NULL,
+ stcb->asoc.max_send_times)) {
+ /* Association was destroyed */
+ return (1);
+ }
+ }
+ if (stcb->asoc.sctp_cmt_on_off > 0) {
+ if (net->pf_threshold < net->failure_threshold) {
+ alt = sctp_find_alternate_net(stcb, net, 2);
+ } else {
+ /*
+ * CMT: Using RTX_SSTHRESH policy for CMT.
+ * If CMT is being used, then pick dest with
+ * largest ssthresh for any retransmission.
+ */
+ alt = sctp_find_alternate_net(stcb, net, 1);
+ /*
+ * CUCv2: If a different dest is picked for
+ * the retransmission, then new
+ * (rtx-)pseudo_cumack needs to be tracked
+ * for orig dest. Let CUCv2 track new (rtx-)
+ * pseudo-cumack always.
+ */
+ net->find_pseudo_cumack = 1;
+ net->find_rtx_pseudo_cumack = 1;
+ }
+ } else {
+ alt = sctp_find_alternate_net(stcb, net, 0);
+ }
+
+ num_mk = 0;
+ num_abandoned = 0;
+ (void)sctp_mark_all_for_resend(stcb, net, alt, win_probe,
+ &num_mk, &num_abandoned);
+ /* FR Loss recovery just ended with the T3. */
+ stcb->asoc.fast_retran_loss_recovery = 0;
+
+ /* CMT FR loss recovery ended with the T3 */
+ net->fast_retran_loss_recovery = 0;
+ if ((stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins) &&
+ (net->flight_size == 0)) {
+ (*stcb->asoc.cc_functions.sctp_cwnd_new_transmission_begins)(stcb, net);
+ }
+
+ /*
+ * setup the sat loss recovery that prevents satellite cwnd advance.
+ */
+ stcb->asoc.sat_t3_loss_recovery = 1;
+ stcb->asoc.sat_t3_recovery_tsn = stcb->asoc.sending_seq;
+
+ /* Backoff the timer and cwnd */
+ sctp_backoff_on_timeout(stcb, net, win_probe, num_mk, num_abandoned);
+ if ((!(net->dest_state & SCTP_ADDR_REACHABLE)) ||
+ (net->dest_state & SCTP_ADDR_PF)) {
+ /* Move all pending over too */
+ sctp_move_chunks_from_net(stcb, net);
+
+ /* Get the address that failed, to
+ * force a new src address selecton and
+ * a route allocation.
+ */
+ if (net->ro._s_addr) {
+ sctp_free_ifa(net->ro._s_addr);
+ net->ro._s_addr = NULL;
+ }
+ net->src_addr_selected = 0;
+
+ /* Force a route allocation too */
+ if (net->ro.ro_rt) {
+ RTFREE(net->ro.ro_rt);
+ net->ro.ro_rt = NULL;
+ }
+
+ /* Was it our primary? */
+ if ((stcb->asoc.primary_destination == net) && (alt != net)) {
+ /*
+ * Yes, note it as such and find an alternate note:
+ * this means HB code must use this to resent the
+ * primary if it goes active AND if someone does a
+ * change-primary then this flag must be cleared
+ * from any net structures.
+ */
+ if (stcb->asoc.alternate) {
+ sctp_free_remote_addr(stcb->asoc.alternate);
+ }
+ stcb->asoc.alternate = alt;
+ atomic_add_int(&stcb->asoc.alternate->ref_count, 1);
+ }
+ }
+ /*
+ * Special case for cookie-echo'ed case, we don't do output but must
+ * await the COOKIE-ACK before retransmission
+ */
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
+ /*
+ * Here we just reset the timer and start again since we
+ * have not established the asoc
+ */
+ sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, net);
+ return (0);
+ }
+ if (stcb->asoc.prsctp_supported) {
+ struct sctp_tmit_chunk *lchk;
+
+ lchk = sctp_try_advance_peer_ack_point(stcb, &stcb->asoc);
+ /* C3. See if we need to send a Fwd-TSN */
+ if (SCTP_TSN_GT(stcb->asoc.advanced_peer_ack_point, stcb->asoc.last_acked_seq)) {
+ send_forward_tsn(stcb, &stcb->asoc);
+ if (lchk) {
+ /* Assure a timer is up */
+ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo);
+ }
+ }
+ }
+ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_MONITOR_ENABLE) {
+ sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
+ }
+ return (0);
+}
+
+int
+sctp_t1init_timer(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ /* bump the thresholds */
+ if (stcb->asoc.delayed_connection) {
+ /*
+ * special hook for delayed connection. The library did NOT
+ * complete the rest of its sends.
+ */
+ stcb->asoc.delayed_connection = 0;
+ sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
+ return (0);
+ }
+ if (SCTP_GET_STATE((&stcb->asoc)) != SCTP_STATE_COOKIE_WAIT) {
+ return (0);
+ }
+ if (sctp_threshold_management(inp, stcb, net,
+ stcb->asoc.max_init_times)) {
+ /* Association was destroyed */
+ return (1);
+ }
+ stcb->asoc.dropped_special_cnt = 0;
+ sctp_backoff_on_timeout(stcb, stcb->asoc.primary_destination, 1, 0, 0);
+ if (stcb->asoc.initial_init_rto_max < net->RTO) {
+ net->RTO = stcb->asoc.initial_init_rto_max;
+ }
+ if (stcb->asoc.numnets > 1) {
+ /* If we have more than one addr use it */
+ struct sctp_nets *alt;
+
+ alt = sctp_find_alternate_net(stcb, stcb->asoc.primary_destination, 0);
+ if (alt != stcb->asoc.primary_destination) {
+ sctp_move_chunks_from_net(stcb, stcb->asoc.primary_destination);
+ stcb->asoc.primary_destination = alt;
+ }
+ }
+ /* Send out a new init */
+ sctp_send_initiate(inp, stcb, SCTP_SO_NOT_LOCKED);
+ return (0);
+}
+
+/*
+ * For cookie and asconf we actually need to find and mark for resend, then
+ * increment the resend counter (after all the threshold management stuff of
+ * course).
+ */
+int
+sctp_cookie_timer(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net SCTP_UNUSED)
+{
+ struct sctp_nets *alt;
+ struct sctp_tmit_chunk *cookie;
+
+ /* first before all else we must find the cookie */
+ TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue, sctp_next) {
+ if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
+ break;
+ }
+ }
+ if (cookie == NULL) {
+ if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
+ /* FOOBAR! */
+ struct mbuf *op_err;
+
+ op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION,
+ "Cookie timer expired, but no cookie");
+ inp->last_abort_code = SCTP_FROM_SCTP_TIMER+SCTP_LOC_4;
+ sctp_abort_an_association(inp, stcb, op_err, SCTP_SO_NOT_LOCKED);
+ } else {
+#ifdef INVARIANTS
+ panic("Cookie timer expires in wrong state?");
+#else
+ SCTP_PRINTF("Strange in state %d not cookie-echoed yet c-e timer expires?\n", SCTP_GET_STATE(&stcb->asoc));
+ return (0);
+#endif
+ }
+ return (0);
+ }
+ /* Ok we found the cookie, threshold management next */
+ if (sctp_threshold_management(inp, stcb, cookie->whoTo,
+ stcb->asoc.max_init_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ /*
+ * cleared theshold management now lets backoff the address & select
+ * an alternate
+ */
+ stcb->asoc.dropped_special_cnt = 0;
+ sctp_backoff_on_timeout(stcb, cookie->whoTo, 1, 0, 0);
+ alt = sctp_find_alternate_net(stcb, cookie->whoTo, 0);
+ if (alt != cookie->whoTo) {
+ sctp_free_remote_addr(cookie->whoTo);
+ cookie->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+ }
+ /* Now mark the retran info */
+ if (cookie->sent != SCTP_DATAGRAM_RESEND) {
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ }
+ cookie->sent = SCTP_DATAGRAM_RESEND;
+ /*
+ * Now call the output routine to kick out the cookie again, Note we
+ * don't mark any chunks for retran so that FR will need to kick in
+ * to move these (or a send timer).
+ */
+ return (0);
+}
+
+int
+sctp_strreset_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_nets *alt;
+ struct sctp_tmit_chunk *strrst = NULL, *chk = NULL;
+
+ if (stcb->asoc.stream_reset_outstanding == 0) {
+ return (0);
+ }
+ /* find the existing STRRESET, we use the seq number we sent out on */
+ (void)sctp_find_stream_reset(stcb, stcb->asoc.str_reset_seq_out, &strrst);
+ if (strrst == NULL) {
+ return (0);
+ }
+ /* do threshold management */
+ if (sctp_threshold_management(inp, stcb, strrst->whoTo,
+ stcb->asoc.max_send_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ /*
+ * cleared theshold management now lets backoff the address & select
+ * an alternate
+ */
+ sctp_backoff_on_timeout(stcb, strrst->whoTo, 1, 0, 0);
+ alt = sctp_find_alternate_net(stcb, strrst->whoTo, 0);
+ sctp_free_remote_addr(strrst->whoTo);
+ strrst->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+
+ /* See if a ECN Echo is also stranded */
+ TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
+ if ((chk->whoTo == net) &&
+ (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
+ sctp_free_remote_addr(chk->whoTo);
+ if (chk->sent != SCTP_DATAGRAM_RESEND) {
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ }
+ chk->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+ }
+ }
+ if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
+ /*
+ * If the address went un-reachable, we need to move to
+ * alternates for ALL chk's in queue
+ */
+ sctp_move_chunks_from_net(stcb, net);
+ }
+ /* mark the retran info */
+ if (strrst->sent != SCTP_DATAGRAM_RESEND)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ strrst->sent = SCTP_DATAGRAM_RESEND;
+
+ /* restart the timer */
+ sctp_timer_start(SCTP_TIMER_TYPE_STRRESET, inp, stcb, strrst->whoTo);
+ return (0);
+}
+
+int
+sctp_asconf_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_nets *alt;
+ struct sctp_tmit_chunk *asconf, *chk;
+
+ /* is this a first send, or a retransmission? */
+ if (TAILQ_EMPTY(&stcb->asoc.asconf_send_queue)) {
+ /* compose a new ASCONF chunk and send it */
+ sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
+ } else {
+ /*
+ * Retransmission of the existing ASCONF is needed
+ */
+
+ /* find the existing ASCONF */
+ asconf = TAILQ_FIRST(&stcb->asoc.asconf_send_queue);
+ if (asconf == NULL) {
+ return (0);
+ }
+ /* do threshold management */
+ if (sctp_threshold_management(inp, stcb, asconf->whoTo,
+ stcb->asoc.max_send_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ if (asconf->snd_count > stcb->asoc.max_send_times) {
+ /*
+ * Something is rotten: our peer is not responding to
+ * ASCONFs but apparently is to other chunks. i.e. it
+ * is not properly handling the chunk type upper bits.
+ * Mark this peer as ASCONF incapable and cleanup.
+ */
+ SCTPDBG(SCTP_DEBUG_TIMER1, "asconf_timer: Peer has not responded to our repeated ASCONFs\n");
+ sctp_asconf_cleanup(stcb, net);
+ return (0);
+ }
+ /*
+ * cleared threshold management, so now backoff the net and
+ * select an alternate
+ */
+ sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0, 0);
+ alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
+ if (asconf->whoTo != alt) {
+ sctp_free_remote_addr(asconf->whoTo);
+ asconf->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+ }
+
+ /* See if an ECN Echo is also stranded */
+ TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
+ if ((chk->whoTo == net) &&
+ (chk->rec.chunk_id.id == SCTP_ECN_ECHO)) {
+ sctp_free_remote_addr(chk->whoTo);
+ chk->whoTo = alt;
+ if (chk->sent != SCTP_DATAGRAM_RESEND) {
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ }
+ atomic_add_int(&alt->ref_count, 1);
+ }
+ }
+ TAILQ_FOREACH(chk, &stcb->asoc.asconf_send_queue, sctp_next) {
+ if (chk->whoTo != alt) {
+ sctp_free_remote_addr(chk->whoTo);
+ chk->whoTo = alt;
+ atomic_add_int(&alt->ref_count, 1);
+ }
+ if (asconf->sent != SCTP_DATAGRAM_RESEND && chk->sent != SCTP_DATAGRAM_UNSENT)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ chk->sent = SCTP_DATAGRAM_RESEND;
+ }
+ if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
+ /*
+ * If the address went un-reachable, we need to move
+ * to the alternate for ALL chunks in queue
+ */
+ sctp_move_chunks_from_net(stcb, net);
+ }
+ /* mark the retran info */
+ if (asconf->sent != SCTP_DATAGRAM_RESEND)
+ sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+ asconf->sent = SCTP_DATAGRAM_RESEND;
+
+ /* send another ASCONF if any and we can do */
+ sctp_send_asconf(stcb, alt, SCTP_ADDR_NOT_LOCKED);
+ }
+ return (0);
+}
+
+/* Mobility adaptation */
+void
+sctp_delete_prim_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net SCTP_UNUSED)
+{
+ if (stcb->asoc.deleted_primary == NULL) {
+ SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: deleted_primary is not stored...\n");
+ sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
+ return;
+ }
+ SCTPDBG(SCTP_DEBUG_ASCONF1, "delete_prim_timer: finished to keep deleted primary ");
+ SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
+ sctp_free_remote_addr(stcb->asoc.deleted_primary);
+ stcb->asoc.deleted_primary = NULL;
+ sctp_mobility_feature_off(inp, SCTP_MOBILITY_PRIM_DELETED);
+ return;
+}
+
+/*
+ * For the shutdown and shutdown-ack, we do not keep one around on the
+ * control queue. This means we must generate a new one and call the general
+ * chunk output routine, AFTER having done threshold management.
+ * It is assumed that net is non-NULL.
+ */
+int
+sctp_shutdown_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_nets *alt;
+
+ /* first threshold managment */
+ if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
+ /* second select an alternative */
+ alt = sctp_find_alternate_net(stcb, net, 0);
+
+ /* third generate a shutdown into the queue for out net */
+ sctp_send_shutdown(stcb, alt);
+
+ /* fourth restart timer */
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, inp, stcb, alt);
+ return (0);
+}
+
+int
+sctp_shutdownack_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct sctp_nets *alt;
+
+ /* first threshold managment */
+ if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
+ /* second select an alternative */
+ alt = sctp_find_alternate_net(stcb, net, 0);
+
+ /* third generate a shutdown into the queue for out net */
+ sctp_send_shutdown_ack(stcb, alt);
+
+ /* fourth restart timer */
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, inp, stcb, alt);
+ return (0);
+}
+
+static void
+sctp_audit_stream_queues_for_size(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb)
+{
+ struct sctp_stream_queue_pending *sp;
+ unsigned int i, chks_in_queue = 0;
+ int being_filled = 0;
+ /*
+ * This function is ONLY called when the send/sent queues are empty.
+ */
+ if ((stcb == NULL) || (inp == NULL))
+ return;
+
+ if (stcb->asoc.sent_queue_retran_cnt) {
+ SCTP_PRINTF("Hmm, sent_queue_retran_cnt is non-zero %d\n",
+ stcb->asoc.sent_queue_retran_cnt);
+ stcb->asoc.sent_queue_retran_cnt = 0;
+ }
+ if (stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
+ /* No stream scheduler information, initialize scheduler */
+ stcb->asoc.ss_functions.sctp_ss_init(stcb, &stcb->asoc, 0);
+ if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, &stcb->asoc)) {
+ /* yep, we lost a stream or two */
+ SCTP_PRINTF("Found additional streams NOT managed by scheduler, corrected\n");
+ } else {
+ /* no streams lost */
+ stcb->asoc.total_output_queue_size = 0;
+ }
+ }
+ /* Check to see if some data queued, if so report it */
+ for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+ if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
+ TAILQ_FOREACH(sp, &stcb->asoc.strmout[i].outqueue, next) {
+ if (sp->msg_is_complete)
+ being_filled++;
+ chks_in_queue++;
+ }
+ }
+ }
+ if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
+ SCTP_PRINTF("Hmm, stream queue cnt at %d I counted %d in stream out wheel\n",
+ stcb->asoc.stream_queue_cnt, chks_in_queue);
+ }
+ if (chks_in_queue) {
+ /* call the output queue function */
+ sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
+ if ((TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
+ (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
+ /*
+ * Probably should go in and make it go back through
+ * and add fragments allowed
+ */
+ if (being_filled == 0) {
+ SCTP_PRINTF("Still nothing moved %d chunks are stuck\n",
+ chks_in_queue);
+ }
+ }
+ } else {
+ SCTP_PRINTF("Found no chunks on any queue tot:%lu\n",
+ (u_long)stcb->asoc.total_output_queue_size);
+ stcb->asoc.total_output_queue_size = 0;
+ }
+}
+
+int
+sctp_heartbeat_timer(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ uint8_t net_was_pf;
+
+ if (net->dest_state & SCTP_ADDR_PF) {
+ net_was_pf = 1;
+ } else {
+ net_was_pf = 0;
+ }
+ if (net->hb_responded == 0) {
+ if (net->ro._s_addr) {
+ /* Invalidate the src address if we did not get
+ * a response last time.
+ */
+ sctp_free_ifa(net->ro._s_addr);
+ net->ro._s_addr = NULL;
+ net->src_addr_selected = 0;
+ }
+ sctp_backoff_on_timeout(stcb, net, 1, 0, 0);
+ if (sctp_threshold_management(inp, stcb, net, stcb->asoc.max_send_times)) {
+ /* Assoc is over */
+ return (1);
+ }
+ }
+ /* Zero PBA, if it needs it */
+ if (net->partial_bytes_acked) {
+ net->partial_bytes_acked = 0;
+ }
+ if ((stcb->asoc.total_output_queue_size > 0) &&
+ (TAILQ_EMPTY(&stcb->asoc.send_queue)) &&
+ (TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
+ sctp_audit_stream_queues_for_size(inp, stcb);
+ }
+ if (!(net->dest_state & SCTP_ADDR_NOHB) &&
+ !((net_was_pf == 0) && (net->dest_state & SCTP_ADDR_PF))) {
+ /* when move to PF during threshold mangement, a HB has been
+ queued in that routine */
+ uint32_t ms_gone_by;
+
+ if ((net->last_sent_time.tv_sec > 0) ||
+ (net->last_sent_time.tv_usec > 0)) {
+#ifdef __FreeBSD__
+ struct timeval diff;
+
+ SCTP_GETTIME_TIMEVAL(&diff);
+ timevalsub(&diff, &net->last_sent_time);
+#else
+ struct timeval diff, now;
+
+ SCTP_GETTIME_TIMEVAL(&now);
+ timersub(&now, &net->last_sent_time, &diff);
+#endif
+ ms_gone_by = (uint32_t)(diff.tv_sec * 1000) +
+ (uint32_t)(diff.tv_usec / 1000);
+ } else {
+ ms_gone_by = 0xffffffff;
+ }
+ if ((ms_gone_by >= net->heart_beat_delay) ||
+ (net->dest_state & SCTP_ADDR_PF)) {
+ sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+ }
+ }
+ return (0);
+}
+
+void
+sctp_pathmtu_timer(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ uint32_t next_mtu, mtu;
+
+ next_mtu = sctp_get_next_mtu(net->mtu);
+
+ if ((next_mtu > net->mtu) && (net->port == 0)) {
+ if ((net->src_addr_selected == 0) ||
+ (net->ro._s_addr == NULL) ||
+ (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
+ if ((net->ro._s_addr != NULL) && (net->ro._s_addr->localifa_flags & SCTP_BEING_DELETED)) {
+ sctp_free_ifa(net->ro._s_addr);
+ net->ro._s_addr = NULL;
+ net->src_addr_selected = 0;
+ } else if (net->ro._s_addr == NULL) {
+#if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
+ if (net->ro._l_addr.sa.sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
+ /* KAME hack: embed scopeid */
+#if defined(__APPLE__)
+#if defined(APPLE_LEOPARD) || defined(APPLE_SNOWLEOPARD)
+ (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL);
+#else
+ (void)in6_embedscope(&sin6->sin6_addr, sin6, NULL, NULL, NULL);
+#endif
+#elif defined(SCTP_KAME)
+ (void)sa6_embedscope(sin6, MODULE_GLOBAL(ip6_use_defzone));
+#else
+ (void)in6_embedscope(&sin6->sin6_addr, sin6);
+#endif
+ }
+#endif
+
+ net->ro._s_addr = sctp_source_address_selection(inp,
+ stcb,
+ (sctp_route_t *)&net->ro,
+ net, 0, stcb->asoc.vrf_id);
+#if defined(INET6) && defined(SCTP_EMBEDDED_V6_SCOPE)
+ if (net->ro._l_addr.sa.sa_family == AF_INET6) {
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&net->ro._l_addr;
+#ifdef SCTP_KAME
+ (void)sa6_recoverscope(sin6);
+#else
+ (void)in6_recoverscope(sin6, &sin6->sin6_addr, NULL);
+#endif /* SCTP_KAME */
+ }
+#endif /* INET6 */
+ }
+ if (net->ro._s_addr)
+ net->src_addr_selected = 1;
+ }
+ if (net->ro._s_addr) {
+ mtu = SCTP_GATHER_MTU_FROM_ROUTE(net->ro._s_addr, &net->ro._s_addr.sa, net->ro.ro_rt);
+#if defined(INET) || defined(INET6)
+ if (net->port) {
+ mtu -= sizeof(struct udphdr);
+ }
+#endif
+ if (mtu > next_mtu) {
+ net->mtu = next_mtu;
+ }
+ }
+ }
+ /* restart the timer */
+ sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
+}
+
+void
+sctp_autoclose_timer(struct sctp_inpcb *inp,
+ struct sctp_tcb *stcb,
+ struct sctp_nets *net)
+{
+ struct timeval tn, *tim_touse;
+ struct sctp_association *asoc;
+ int ticks_gone_by;
+
+ (void)SCTP_GETTIME_TIMEVAL(&tn);
+ if (stcb->asoc.sctp_autoclose_ticks &&
+ sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+ /* Auto close is on */
+ asoc = &stcb->asoc;
+ /* pick the time to use */
+ if (asoc->time_last_rcvd.tv_sec >
+ asoc->time_last_sent.tv_sec) {
+ tim_touse = &asoc->time_last_rcvd;
+ } else {
+ tim_touse = &asoc->time_last_sent;
+ }
+ /* Now has long enough transpired to autoclose? */
+ ticks_gone_by = SEC_TO_TICKS(tn.tv_sec - tim_touse->tv_sec);
+ if ((ticks_gone_by > 0) &&
+ (ticks_gone_by >= (int)asoc->sctp_autoclose_ticks)) {
+ /*
+ * autoclose time has hit, call the output routine,
+ * which should do nothing just to be SURE we don't
+ * have hanging data. We can then safely check the
+ * queues and know that we are clear to send
+ * shutdown
+ */
+ sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_AUTOCLOSE_TMR, SCTP_SO_NOT_LOCKED);
+ /* Are we clean? */
+ if (TAILQ_EMPTY(&asoc->send_queue) &&
+ TAILQ_EMPTY(&asoc->sent_queue)) {
+ /*
+ * there is nothing queued to send, so I'm
+ * done...
+ */
+ if (SCTP_GET_STATE(asoc) != SCTP_STATE_SHUTDOWN_SENT) {
+ /* only send SHUTDOWN 1st time thru */
+ struct sctp_nets *netp;
+
+ if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
+ (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+ SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+ }
+ SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
+ SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+ sctp_stop_timers_for_shutdown(stcb);
+ if (stcb->asoc.alternate) {
+ netp = stcb->asoc.alternate;
+ } else {
+ netp = stcb->asoc.primary_destination;
+ }
+ sctp_send_shutdown(stcb, netp);
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
+ stcb->sctp_ep, stcb,
+ netp);
+ sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+ stcb->sctp_ep, stcb,
+ netp);
+ }
+ }
+ } else {
+ /*
+ * No auto close at this time, reset t-o to check
+ * later
+ */
+ int tmp;
+
+ /* fool the timer startup to use the time left */
+ tmp = asoc->sctp_autoclose_ticks;
+ asoc->sctp_autoclose_ticks -= ticks_gone_by;
+ sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
+ net);
+ /* restore the real tick value */
+ asoc->sctp_autoclose_ticks = tmp;
+ }
+ }
+}
+