/*-
* Copyright (c) 2001-2006, Cisco Systems, Inc. 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.
*/
/* $KAME: sctp_timer.c,v 1.29 2005/03/06 16:04:18 itojun Exp $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ipsec.h"
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#include "opt_sctp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#ifdef INET6
#include <sys/domain.h>
#endif
#include <sys/limits.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#define _IP_VHL
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#endif /* INET6 */
#include <netinet/sctp_pcb.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
#endif /* IPSEC */
#ifdef INET6
#include <netinet6/sctp6_var.h>
#endif
#include <netinet/sctp_os.h>
#include <netinet/sctp_var.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>
#ifdef SCTP_DEBUG
extern uint32_t sctp_debug_on;
#endif /* SCTP_DEBUG */
extern unsigned int sctp_early_fr_msec;
void
sctp_early_fr_timer(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
struct sctp_tmit_chunk *chk, *tp2;
struct timeval now, min_wait, tv;
unsigned int cur_rtt, cnt = 0, cnt_resend = 0;
/* an early FR is occuring. */
SCTP_GETTIME_TIMEVAL(&now);
/* get cur rto in micro-seconds */
if (net->lastsa == 0) {
/* Hmm no rtt estimate yet? */
cur_rtt = stcb->asoc.initial_rto >> 2;
} else {
cur_rtt = ((net->lastsa >> 2) + net->lastsv) >> 1;
}
if (cur_rtt < sctp_early_fr_msec) {
cur_rtt = sctp_early_fr_msec;
}
cur_rtt *= 1000;
tv.tv_sec = cur_rtt / 1000000;
tv.tv_usec = cur_rtt % 1000000;
min_wait = now;
timevalsub(&min_wait, &tv);
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;
}
chk = TAILQ_LAST(&stcb->asoc.sent_queue, sctpchunk_listhead);
for (; chk != NULL; chk = tp2) {
tp2 = TAILQ_PREV(chk, sctpchunk_listhead, sctp_next);
if (chk->whoTo != net) {
continue;
}
if (chk->sent == SCTP_DATAGRAM_RESEND)
cnt_resend++;
else if ((chk->sent > SCTP_DATAGRAM_UNSENT) &&
(chk->sent < SCTP_DATAGRAM_RESEND)) {
/* pending, may need retran */
if (chk->sent_rcv_time.tv_sec > min_wait.tv_sec) {
/*
* we have reached a chunk that was sent
* some seconds past our min.. forget it we
* will find no more to send.
*/
continue;
} else if (chk->sent_rcv_time.tv_sec == min_wait.tv_sec) {
/*
* 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;
}
}
#ifdef SCTP_EARLYFR_LOGGING
sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
4, SCTP_FR_MARKED_EARLY);
#endif
SCTP_STAT_INCR(sctps_earlyfrmrkretrans);
chk->sent = SCTP_DATAGRAM_RESEND;
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
/* double book size since we are doing an early FR */
chk->book_size_scale++;
cnt += chk->send_size;
if ((cnt + net->flight_size) > net->cwnd) {
/* Mark all we could possibly resend */
break;
}
}
}
if (cnt) {
#ifdef SCTP_CWND_MONITOR
int old_cwnd;
old_cwnd = net->cwnd;
#endif
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR);
/*
* make a small adjustment to cwnd and force to CA.
*/
if (net->cwnd > net->mtu)
/* drop down one MTU after sending */
net->cwnd -= net->mtu;
if (net->cwnd < net->ssthresh)
/* still in SS move to CA */
net->ssthresh = net->cwnd - 1;
#ifdef SCTP_CWND_MONITOR
sctp_log_cwnd(stcb, net, (old_cwnd - net->cwnd), SCTP_CWND_LOG_FROM_FR);
#endif
} else if (cnt_resend) {
sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_EARLY_FR_TMR);
}
/* Restart it? */
if (net->flight_size < net->cwnd) {
SCTP_STAT_INCR(sctps_earlyfrstrtmr);
sctp_timer_start(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net);
}
}
void
sctp_audit_retranmission_queue(struct sctp_association *asoc)
{
struct sctp_tmit_chunk *chk;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Audit invoked on send queue cnt:%d onqueue:%d\n",
asoc->sent_queue_retran_cnt,
asoc->sent_queue_cnt);
}
#endif /* SCTP_DEBUG */
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);
}
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Audit completes retran:%d onqueue:%d\n",
asoc->sent_queue_retran_cnt,
asoc->sent_queue_cnt);
}
#endif /* SCTP_DEBUG */
}
int
sctp_threshold_management(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
struct sctp_nets *net, uint16_t threshold)
{
if (net) {
net->error_count++;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Error count for %p now %d thresh:%d\n",
net, net->error_count,
net->failure_threshold);
}
#endif /* SCTP_DEBUG */
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_NOT_REACHABLE;
if (net == stcb->asoc.primary_destination) {
net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
}
sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_DOWN,
stcb,
SCTP_FAILED_THRESHOLD,
(void *)net);
}
}
/*********HOLD THIS COMMENT FOR PATCH OF ALTERNATE
*********ROUTING CODE
*/
/*********HOLD THIS COMMENT FOR END OF PATCH OF ALTERNATE
*********ROUTING CODE
*/
}
if (stcb == NULL)
return (0);
if (net) {
if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) == 0) {
stcb->asoc.overall_error_count++;
}
} else {
stcb->asoc.overall_error_count++;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Overall error count for %p now %d thresh:%u state:%x\n",
&stcb->asoc,
stcb->asoc.overall_error_count,
(uint32_t) threshold,
((net == NULL) ? (uint32_t) 0 : (uint32_t) net->dest_state));
}
#endif /* SCTP_DEBUG */
/*
* 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 *oper;
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
oper->m_len = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(oper->m_len);
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(0x40000001);
}
sctp_abort_an_association(inp, stcb, SCTP_FAILED_THRESHOLD, oper);
return (1);
}
return (0);
}
struct sctp_nets *
sctp_find_alternate_net(struct sctp_tcb *stcb,
struct sctp_nets *net,
int highest_ssthresh)
{
/* Find and return an alternate network if possible */
struct sctp_nets *alt, *mnet, *hthresh = NULL;
int once;
uint32_t val = 0;
if (stcb->asoc.numnets == 1) {
/* No others but net */
return (TAILQ_FIRST(&stcb->asoc.nets));
}
if (highest_ssthresh) {
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 (val > mnet->ssthresh) {
hthresh = mnet;
val = mnet->ssthresh;
} else if (val == mnet->ssthresh) {
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) {
hthresh = mnet;
val = mnet->ssthresh;
}
}
}
if (hthresh) {
return (hthresh);
}
}
mnet = net;
once = 0;
if (mnet == NULL) {
mnet = TAILQ_FIRST(&stcb->asoc.nets);
}
do {
alt = TAILQ_NEXT(mnet, sctp_next);
if (alt == NULL) {
once++;
if (once > 1) {
break;
}
alt = TAILQ_FIRST(&stcb->asoc.nets);
}
if (alt->ro.ro_rt == NULL) {
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *)&alt->ro._l_addr;
if (sin6->sin6_family == AF_INET6) {
(void)sa6_embedscope(sin6, ip6_use_defzone);
}
rtalloc_ign((struct route *)&alt->ro, 0UL);
if (sin6->sin6_family == AF_INET6) {
(void)sa6_recoverscope(sin6);
}
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;
} while (alt != NULL);
if (alt == NULL) {
/* Case where NO insv network exists (dormant state) */
/* we rotate destinations */
once = 0;
mnet = net;
do {
alt = TAILQ_NEXT(mnet, sctp_next);
if (alt == NULL) {
once++;
if (once > 1) {
break;
}
alt = TAILQ_FIRST(&stcb->asoc.nets);
}
if ((!(alt->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
(alt != net)) {
/* Found an alternate address */
break;
}
mnet = alt;
} while (alt != NULL);
}
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)
{
net->RTO <<= 1;
if (net->RTO > stcb->asoc.maxrto) {
net->RTO = stcb->asoc.maxrto;
}
if ((win_probe == 0) && num_marked) {
/* We don't apply penalty to window probe scenarios */
#ifdef SCTP_CWND_MONITOR
int old_cwnd = net->cwnd;
#endif
net->ssthresh = net->cwnd >> 1;
if (net->ssthresh < (net->mtu << 1)) {
net->ssthresh = (net->mtu << 1);
}
net->cwnd = net->mtu;
/* floor of 1 mtu */
if (net->cwnd < net->mtu)
net->cwnd = net->mtu;
#ifdef SCTP_CWND_MONITOR
sctp_log_cwnd(stcb, net, net->cwnd - old_cwnd, SCTP_CWND_LOG_FROM_RTX);
#endif
net->partial_bytes_acked = 0;
}
}
extern int sctp_peer_chunk_oh;
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)
{
/*
* 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, *tp2, *could_be_sent = NULL;
struct sctp_nets *lnets;
struct timeval now, min_wait, tv;
int cur_rtt;
int orig_rwnd, audit_tf, num_mk, fir;
unsigned int cnt_mk;
uint32_t orig_flight;
uint32_t tsnlast, tsnfirst;
/*
* CMT: Using RTX_SSTHRESH policy for CMT. If CMT is being used,
* then pick dest with largest ssthresh for any retransmission.
* (iyengar@cis.udel.edu, 2005/08/12)
*/
if (sctp_cmt_on_off) {
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;
}
/* none in flight now */
audit_tf = 0;
fir = 0;
/*
* figure out how long a data chunk must be pending before we can
* mark it ..
*/
SCTP_GETTIME_TIMEVAL(&now);
/* get cur rto in micro-seconds */
cur_rtt = (((net->lastsa >> 2) + net->lastsv) >> 1);
cur_rtt *= 1000;
#if defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(cur_rtt,
stcb->asoc.peers_rwnd,
window_probe,
SCTP_FR_T3_MARK_TIME);
sctp_log_fr(net->flight_size,
callout_pending(&net->fr_timer.timer),
callout_active(&net->fr_timer.timer),
SCTP_FR_CWND_REPORT);
sctp_log_fr(net->flight_size, net->cwnd, stcb->asoc.total_flight, SCTP_FR_CWND_REPORT);
#endif
tv.tv_sec = cur_rtt / 1000000;
tv.tv_usec = cur_rtt % 1000000;
min_wait = now;
timevalsub(&min_wait, &tv);
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 defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(cur_rtt, 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);
#endif
/*
* Our rwnd will be incorrect here since we are not adding back the
* cnt * mbuf but we will fix that down below.
*/
orig_rwnd = stcb->asoc.peers_rwnd;
orig_flight = net->flight_size;
net->rto_pending = 0;
net->fast_retran_ip = 0;
/* Now on to each chunk */
num_mk = cnt_mk = 0;
tsnfirst = tsnlast = 0;
chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
for (; chk != NULL; chk = tp2) {
tp2 = TAILQ_NEXT(chk, sctp_next);
if ((compare_with_wrap(stcb->asoc.last_acked_seq,
chk->rec.data.TSN_seq,
MAX_TSN)) ||
(stcb->asoc.last_acked_seq == chk->rec.data.TSN_seq)) {
/* Strange case our list got out of order? */
printf("Our list is out of order?\n");
panic("Out of order list");
}
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 defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
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);
#endif
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 defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(0,
chk->sent_rcv_time.tv_sec,
chk->sent_rcv_time.tv_usec,
SCTP_FR_T3_STOPPED);
#endif
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.
*/
#if defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(0,
chk->sent_rcv_time.tv_sec,
chk->sent_rcv_time.tv_usec,
SCTP_FR_T3_STOPPED);
#endif
continue;
}
}
if (PR_SCTP_TTL_ENABLED(chk->flags)) {
/* Is it expired? */
if ((now.tv_sec > chk->rec.data.timetodrop.tv_sec) ||
((chk->rec.data.timetodrop.tv_sec == now.tv_sec) &&
(now.tv_usec > chk->rec.data.timetodrop.tv_usec))) {
/* Yes so drop it */
if (chk->data) {
sctp_release_pr_sctp_chunk(stcb,
chk,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
&stcb->asoc.sent_queue);
}
}
continue;
}
if (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) {
sctp_release_pr_sctp_chunk(stcb,
chk,
(SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT),
&stcb->asoc.sent_queue);
}
}
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 defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
0, SCTP_FR_T3_MARKED);
#endif
}
if (stcb->asoc.total_flight_count > 0)
stcb->asoc.total_flight_count--;
chk->sent = SCTP_DATAGRAM_RESEND;
SCTP_STAT_INCR(sctps_markedretrans);
net->flight_size -= chk->book_size;
stcb->asoc.peers_rwnd += chk->send_size;
stcb->asoc.peers_rwnd += sctp_peer_chunk_oh;
/* 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 */
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;
}
}
if (sctp_cmt_on_off == 1) {
chk->no_fr_allowed = 1;
}
} else if (chk->sent == SCTP_DATAGRAM_ACKED) {
/* remember highest acked one */
could_be_sent = chk;
}
if (chk->sent == SCTP_DATAGRAM_RESEND) {
cnt_mk++;
}
}
#if defined(SCTP_FR_LOGGING) || defined(SCTP_EARLYFR_LOGGING)
sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
#endif
if (stcb->asoc.total_flight >= (orig_flight - net->flight_size)) {
stcb->asoc.total_flight -= (orig_flight - net->flight_size);
} else {
stcb->asoc.total_flight = 0;
stcb->asoc.total_flight_count = 0;
audit_tf = 1;
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
if (num_mk) {
printf("LAST TSN marked was %x\n", tsnlast);
printf("Num marked for retransmission was %d peer-rwd:%ld\n",
num_mk, (u_long)stcb->asoc.peers_rwnd);
printf("LAST TSN marked was %x\n", tsnlast);
printf("Num marked for retransmission was %d peer-rwd:%d\n",
num_mk,
(int)stcb->asoc.peers_rwnd
);
}
}
#endif
*num_marked = num_mk;
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;
}
if (stcb->asoc.sent_queue_retran_cnt != cnt_mk) {
#ifdef INVARIENTS
printf("Local Audit says there are %d for retran asoc cnt:%d\n",
cnt_mk, stcb->asoc.sent_queue_retran_cnt);
#endif
#ifndef SCTP_AUDITING_ENABLED
stcb->asoc.sent_queue_retran_cnt = cnt_mk;
#endif
}
/* Now check for a ECN Echo that may be 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);
}
}
if (audit_tf) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Audit total flight due to negative value net:%p\n",
net);
}
#endif /* SCTP_DEBUG */
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;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER4) {
printf("Net:%p c-f cwnd:%d ssthresh:%d\n",
lnets, lnets->cwnd, lnets->ssthresh);
}
#endif /* SCTP_DEBUG */
}
TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
if (chk->sent < SCTP_DATAGRAM_RESEND) {
stcb->asoc.total_flight += chk->book_size;
chk->whoTo->flight_size += chk->book_size;
stcb->asoc.total_flight_count++;
}
}
}
/*
* Setup the ecn nonce re-sync point. We do this since
* retranmissions are NOT setup for ECN. This means that do to
* Karn's rule, we don't know the total of the peers ecn bits.
*/
chk = TAILQ_FIRST(&stcb->asoc.send_queue);
if (chk == NULL) {
stcb->asoc.nonce_resync_tsn = stcb->asoc.sending_seq;
} else {
stcb->asoc.nonce_resync_tsn = chk->rec.data.TSN_seq;
}
stcb->asoc.nonce_wait_for_ecne = 0;
stcb->asoc.nonce_sum_check = 0;
/* We return 1 if we only have a window probe outstanding */
return (0);
}
static void
sctp_move_all_chunks_to_alt(struct sctp_tcb *stcb,
struct sctp_nets *net,
struct sctp_nets *alt)
{
struct sctp_association *asoc;
struct sctp_stream_out *outs;
struct sctp_tmit_chunk *chk;
struct sctp_stream_queue_pending *sp;
if (net == alt)
/* nothing to do */
return;
asoc = &stcb->asoc;
/*
* now through all the streams checking for chunks sent to our bad
* network.
*/
TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
/* now clean up any chunks here */
TAILQ_FOREACH(sp, &outs->outqueue, next) {
if (sp->net == net) {
sctp_free_remote_addr(sp->net);
sp->net = alt;
atomic_add_int(&alt->ref_count, 1);
}
}
}
/* Now check the pending queue */
TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
if (chk->whoTo == net) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = alt;
atomic_add_int(&alt->ref_count, 1);
}
}
}
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;
#ifdef SCTP_FR_LOGGING
sctp_log_fr(0, 0, 0, SCTP_FR_T3_TIMEOUT);
#ifdef SCTP_CWND_LOGGING
{
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);
}
}
}
#endif
#endif
/* 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;
}
alt = sctp_find_alternate_net(stcb, net, 0);
sctp_mark_all_for_resend(stcb, net, alt, win_probe, &num_mk);
/* 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;
/*
* 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);
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;
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 ((ms_goneby > net->RTO) || (net->RTO == 0)) {
/*
* no recent feed back in an RTO or
* more, request a RTT update
*/
sctp_send_hb(stcb, 1, net);
}
}
}
} 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 (net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
/* Move all pending over too */
sctp_move_all_chunks_to_alt(stcb, net, alt);
/* 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 (sctp_set_primary_addr(stcb,
(struct sockaddr *)NULL,
alt) == 0) {
net->dest_state |= SCTP_ADDR_WAS_PRIMARY;
net->src_addr_selected = 0;
}
}
}
/*
* 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.peer_supports_prsctp) {
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 (compare_with_wrap(stcb->asoc.advanced_peer_ack_point,
stcb->asoc.last_acked_seq, MAX_TSN)) {
/*
* ISSUE with ECN, see FWD-TSN processing for notes
* on issues that will occur when the ECN NONCE
* stuff is put into SCTP for cross checking.
*/
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);
}
}
}
#ifdef SCTP_CWND_MONITOR
sctp_log_cwnd(stcb, net, net->cwnd, SCTP_CWND_LOG_FROM_RTX);
#endif
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);
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);
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 != NULL) && (alt != stcb->asoc.primary_destination)) {
sctp_move_all_chunks_to_alt(stcb, stcb->asoc.primary_destination, alt);
stcb->asoc.primary_destination = alt;
}
}
/* Send out a new init */
sctp_send_initiate(inp, stcb);
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)
{
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 *oper;
oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)),
0, M_DONTWAIT, 1, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
uint32_t *ippp;
oper->m_len = sizeof(struct sctp_paramhdr) +
sizeof(uint32_t);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(oper->m_len);
ippp = (uint32_t *) (ph + 1);
*ippp = htonl(0x40000002);
}
sctp_abort_an_association(inp, stcb, SCTP_INTERNAL_ERROR,
oper);
} else {
#ifdef INVARIENTS
panic("Cookie timer expires in wrong state?");
#else
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);
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 */
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);
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_NOT_REACHABLE) {
/*
* If the address went un-reachable, we need to move to
* alternates for ALL chk's in queue
*/
sctp_move_all_chunks_to_alt(stcb, net, alt);
}
/* 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 the first send, or a retransmission? */
if (stcb->asoc.asconf_sent == 0) {
/* compose a new ASCONF chunk and send it */
sctp_send_asconf(stcb, net);
} else {
/* Retransmission of the existing ASCONF needed... */
/* find the existing ASCONF */
TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
sctp_next) {
if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
break;
}
}
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);
}
/*
* PETER? FIX? How will the following code ever run? If the
* max_send_times is hit, threshold managment will blow away
* the association?
*/
if (asconf->snd_count > stcb->asoc.max_send_times) {
/*
* Something is rotten, peer is not responding to
* ASCONFs but maybe is to data etc. e.g. it is not
* properly handling the chunk type upper bits Mark
* this peer as ASCONF incapable and cleanup
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("asconf_timer: Peer has not responded to our repeated ASCONFs\n");
}
#endif /* SCTP_DEBUG */
sctp_asconf_cleanup(stcb, net);
return (0);
}
/*
* cleared theshold management now lets backoff the address
* & select an alternate
*/
sctp_backoff_on_timeout(stcb, asconf->whoTo, 1, 0);
alt = sctp_find_alternate_net(stcb, asconf->whoTo, 0);
sctp_free_remote_addr(asconf->whoTo);
asconf->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);
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);
}
}
if (net->dest_state & SCTP_ADDR_NOT_REACHABLE) {
/*
* If the address went un-reachable, we need to move
* to alternates for ALL chk's in queue
*/
sctp_move_all_chunks_to_alt(stcb, net, alt);
}
/* mark the retran info */
if (asconf->sent != SCTP_DATAGRAM_RESEND)
sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
asconf->sent = SCTP_DATAGRAM_RESEND;
}
return (0);
}
/*
* 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.
*/
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);
}
/* second select an alternative */
alt = sctp_find_alternate_net(stcb, net, 0);
/* third generate a shutdown into the queue for out net */
if (alt) {
sctp_send_shutdown(stcb, alt);
} else {
/*
* if alt is NULL, there is no dest to send to??
*/
return (0);
}
/* 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);
}
/* 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_out *outs;
struct sctp_stream_queue_pending *sp;
unsigned int 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) {
printf("Hmm, sent_queue_retran_cnt is non-zero %d\n",
stcb->asoc.sent_queue_retran_cnt);
stcb->asoc.sent_queue_retran_cnt = 0;
}
SCTP_TCB_SEND_LOCK(stcb);
if (TAILQ_EMPTY(&stcb->asoc.out_wheel)) {
int i, cnt = 0;
/* Check to see if a spoke fell off the wheel */
for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
sctp_insert_on_wheel(stcb, &stcb->asoc, &stcb->asoc.strmout[i], 1);
cnt++;
}
}
if (cnt) {
/* yep, we lost a spoke or two */
printf("Found an additional %d streams NOT on outwheel, corrected\n", cnt);
} else {
/* no spokes lost, */
stcb->asoc.total_output_queue_size = 0;
}
SCTP_TCB_SEND_UNLOCK(stcb);
return;
}
SCTP_TCB_SEND_UNLOCK(stcb);
/* Check to see if some data queued, if so report it */
TAILQ_FOREACH(outs, &stcb->asoc.out_wheel, next_spoke) {
if (!TAILQ_EMPTY(&outs->outqueue)) {
TAILQ_FOREACH(sp, &outs->outqueue, next) {
if (sp->msg_is_complete)
being_filled++;
chks_in_queue++;
}
}
}
if (chks_in_queue != stcb->asoc.stream_queue_cnt) {
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);
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) {
printf("Still nothing moved %d chunks are stuck\n",
chks_in_queue);
}
}
} else {
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, int cnt_of_unconf)
{
if (net) {
if (net->hb_responded == 0) {
sctp_backoff_on_timeout(stcb, net, 1, 0);
}
/* 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);
}
/* Send a new HB, this will do threshold managment, pick a new dest */
if (cnt_of_unconf == 0) {
if (sctp_send_hb(stcb, 0, NULL) < 0) {
return (1);
}
} else {
/*
* this will send out extra hb's up to maxburst if there are
* any unconfirmed addresses.
*/
int cnt_sent = 0;
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
(net->dest_state & SCTP_ADDR_REACHABLE)) {
cnt_sent++;
if (sctp_send_hb(stcb, 1, net) == 0) {
break;
}
if (cnt_sent >= stcb->asoc.max_burst)
break;
}
}
}
return (0);
}
int
sctp_is_hb_timer_running(struct sctp_tcb *stcb)
{
if (callout_pending(&stcb->asoc.hb_timer.timer)) {
/* its running */
return (1);
} else {
/* nope */
return (0);
}
}
int
sctp_is_sack_timer_running(struct sctp_tcb *stcb)
{
if (callout_pending(&stcb->asoc.dack_timer.timer)) {
/* its running */
return (1);
} else {
/* nope */
return (0);
}
}
#define SCTP_NUMBER_OF_MTU_SIZES 18
static uint32_t mtu_sizes[] = {
68,
296,
508,
512,
544,
576,
1006,
1492,
1500,
1536,
2002,
2048,
4352,
4464,
8166,
17914,
32000,
65535
};
static uint32_t
sctp_getnext_mtu(struct sctp_inpcb *inp, uint32_t cur_mtu)
{
/* select another MTU that is just bigger than this one */
int i;
for (i = 0; i < SCTP_NUMBER_OF_MTU_SIZES; i++) {
if (cur_mtu < mtu_sizes[i]) {
/* no max_mtu is bigger than this one */
return (mtu_sizes[i]);
}
}
/* here return the highest allowable */
return (cur_mtu);
}
void
sctp_pathmtu_timer(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_nets *net)
{
uint32_t next_mtu;
/* restart the timer in any case */
next_mtu = sctp_getnext_mtu(inp, net->mtu);
if (next_mtu <= net->mtu) {
/* nothing to do */
return;
}
if (net->ro.ro_rt != NULL) {
/*
* only if we have a route and interface do we set anything.
* Note we always restart the timer though just in case it
* is updated (i.e. the ifp) or route/ifp is populated.
*/
if (net->ro.ro_rt->rt_ifp != NULL) {
if (net->ro.ro_rt->rt_ifp->if_mtu > next_mtu) {
/* ok it will fit out the door */
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;
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);
/* 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 */
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
SCTP_STAT_DECR_GAUGE32(sctps_currestab);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
stcb->sctp_ep, stcb,
asoc->primary_destination);
sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
stcb->sctp_ep, stcb,
asoc->primary_destination);
}
}
} 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;
}
}
}
void
sctp_iterator_timer(struct sctp_iterator *it)
{
int iteration_count = 0;
/*
* only one iterator can run at a time. This is the only way we can
* cleanly pull ep's from underneath all the running interators when
* a ep is freed.
*/
SCTP_ITERATOR_LOCK();
if (it->inp == NULL) {
/* iterator is complete */
done_with_iterator:
SCTP_ITERATOR_UNLOCK();
SCTP_INP_INFO_WLOCK();
LIST_REMOVE(it, sctp_nxt_itr);
/* stopping the callout is not needed, in theory */
SCTP_INP_INFO_WUNLOCK();
callout_stop(&it->tmr.timer);
if (it->function_atend != NULL) {
(*it->function_atend) (it->pointer, it->val);
}
SCTP_FREE(it);
return;
}
select_a_new_ep:
SCTP_INP_WLOCK(it->inp);
while (((it->pcb_flags) &&
((it->inp->sctp_flags & it->pcb_flags) != it->pcb_flags)) ||
((it->pcb_features) &&
((it->inp->sctp_features & it->pcb_features) != it->pcb_features))) {
/* endpoint flags or features don't match, so keep looking */
if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
SCTP_INP_WUNLOCK(it->inp);
goto done_with_iterator;
}
SCTP_INP_WUNLOCK(it->inp);
it->inp = LIST_NEXT(it->inp, sctp_list);
if (it->inp == NULL) {
goto done_with_iterator;
}
SCTP_INP_WLOCK(it->inp);
}
if ((it->inp->inp_starting_point_for_iterator != NULL) &&
(it->inp->inp_starting_point_for_iterator != it)) {
printf("Iterator collision, waiting for one at %p\n",
it->inp);
SCTP_INP_WUNLOCK(it->inp);
goto start_timer_return;
}
/* mark the current iterator on the endpoint */
it->inp->inp_starting_point_for_iterator = it;
SCTP_INP_WUNLOCK(it->inp);
SCTP_INP_RLOCK(it->inp);
/* now go through each assoc which is in the desired state */
if (it->stcb == NULL) {
/* run the per instance function */
if (it->function_inp != NULL)
(*it->function_inp) (it->inp, it->pointer, it->val);
it->stcb = LIST_FIRST(&it->inp->sctp_asoc_list);
}
SCTP_INP_RUNLOCK(it->inp);
if ((it->stcb) &&
(it->stcb->asoc.stcb_starting_point_for_iterator == it)) {
it->stcb->asoc.stcb_starting_point_for_iterator = NULL;
}
while (it->stcb) {
SCTP_TCB_LOCK(it->stcb);
if (it->asoc_state && ((it->stcb->asoc.state & it->asoc_state) != it->asoc_state)) {
/* not in the right state... keep looking */
SCTP_TCB_UNLOCK(it->stcb);
goto next_assoc;
}
/* mark the current iterator on the assoc */
it->stcb->asoc.stcb_starting_point_for_iterator = it;
/* see if we have limited out the iterator loop */
iteration_count++;
if (iteration_count > SCTP_ITERATOR_MAX_AT_ONCE) {
start_timer_return:
/* set a timer to continue this later */
SCTP_TCB_UNLOCK(it->stcb);
sctp_timer_start(SCTP_TIMER_TYPE_ITERATOR,
(struct sctp_inpcb *)it, NULL, NULL);
SCTP_ITERATOR_UNLOCK();
return;
}
/* run function on this one */
(*it->function_assoc) (it->inp, it->stcb, it->pointer, it->val);
/*
* we lie here, it really needs to have its own type but
* first I must verify that this won't effect things :-0
*/
if (it->no_chunk_output == 0)
sctp_chunk_output(it->inp, it->stcb, SCTP_OUTPUT_FROM_T3);
SCTP_TCB_UNLOCK(it->stcb);
next_assoc:
it->stcb = LIST_NEXT(it->stcb, sctp_tcblist);
}
/* done with all assocs on this endpoint, move on to next endpoint */
SCTP_INP_WLOCK(it->inp);
it->inp->inp_starting_point_for_iterator = NULL;
SCTP_INP_WUNLOCK(it->inp);
if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
it->inp = NULL;
} else {
SCTP_INP_INFO_RLOCK();
it->inp = LIST_NEXT(it->inp, sctp_list);
SCTP_INP_INFO_RUNLOCK();
}
if (it->inp == NULL) {
goto done_with_iterator;
}
goto select_a_new_ep;
}