/*
* Copyright (C) 2002, 2003, 2004 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the project 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 PROJECT 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 PROJECT 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sctp_timer.c,v 1.6 2022/02/16 22:00:56 andvar Exp $");
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,
(u_int)threshold,
((net == NULL) ? (u_int)0 : (u_int)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;
MGET(oper, M_DONTWAIT, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
u_int32_t *ippp;
if (net->RTO > stcb->asoc.maxrto) {
net->RTO = stcb->asoc.maxrto;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER2) {
printf("Growth capped by maxrto %d\n",
net->RTO);
}
#endif /* SCTP_DEBUG */
}
if ((win_probe == 0) && num_marked) {
/* We don't apply penalty to window probe scenarios */
#ifdef SCTP_CWND_LOGGING
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_LOGGING
sctp_log_cwnd(net, net->cwnd-old_cwnd, SCTP_CWND_LOG_FROM_RTX);
#endif
net->partial_bytes_acked = 0;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("collapse cwnd to 1MTU ssthresh to %d\n",
net->ssthresh);
}
#endif
}
}
static int
sctp_mark_all_for_resend(struct sctp_tcb *stcb,
struct sctp_nets *net,
struct sctp_nets *alt,
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;
struct sctp_nets *lnets;
struct timeval now, min_wait, tv;
int cur_rto;
int win_probes, non_win_probes, orig_rwnd, audit_tf, num_mk, fir;
unsigned int cnt_mk;
u_int32_t orig_flight;
#ifdef SCTP_FR_LOGGING
u_int32_t tsnfirst, tsnlast;
#endif
/* 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_rto = (((net->lastsa >> 2) + net->lastsv) >> 1);
#ifdef SCTP_FR_LOGGING
sctp_log_fr(cur_rto, 0, 0, SCTP_FR_T3_MARK_TIME);
#endif
cur_rto *= 1000;
#ifdef SCTP_FR_LOGGING
sctp_log_fr(cur_rto, 0, 0, SCTP_FR_T3_MARK_TIME);
#endif
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;
}
#ifdef SCTP_FR_LOGGING
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);
#endif
if (stcb->asoc.total_flight >= net->flight_size) {
stcb->asoc.total_flight -= net->flight_size;
} else {
audit_tf = 1;
stcb->asoc.total_flight = 0;
}
/* 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;
stcb->asoc.peers_rwnd += net->flight_size;
net->flight_size = 0;
net->rto_pending = 0;
net->fast_retran_ip= 0;
win_probes = non_win_probes = 0;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER2) {
printf("Marking ALL un-acked for retransmission at t3-timeout\n");
}
#endif /* SCTP_DEBUG */
/* Now on to each chunk */
num_mk = cnt_mk = 0;
#ifdef SCTP_FR_LOGGING
tsnlast = tsnfirst = 0;
#endif
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");
TAILQ_REMOVE(&stcb->asoc.sent_queue, chk, sctp_next);
if (chk->data) {
sctp_release_pr_sctp_chunk(stcb, chk, 0xffff,
&stcb->asoc.sent_queue);
if (chk->flags & SCTP_PR_SCTP_BUFFER) {
stcb->asoc.sent_queue_cnt_removeable--;
}
}
stcb->asoc.sent_queue_cnt--;
sctp_free_remote_addr(chk->whoTo);
sctppcbinfo.ipi_count_chunk--;
if ((int)sctppcbinfo.ipi_count_chunk < 0) {
panic("Chunk count is going negative");
}
SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
sctppcbinfo.ipi_gencnt_chunk++;
continue;
}
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 */
#ifdef SCTP_FR_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) {
/* we have reached a chunk that was sent some
* seconds past our min.. forget it we will
* find no more to send.
*/
#ifdef SCTP_FR_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) {
/* 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. */
#ifdef SCTP_FR_LOGGING
sctp_log_fr(0,
chk->sent_rcv_time.tv_sec,
chk->sent_rcv_time.tv_usec,
SCTP_FR_T3_STOPPED);
#endif
continue;
}
}
if (stcb->asoc.total_flight_count > 0) {
stcb->asoc.total_flight_count--;
}
if ((chk->flags & (SCTP_PR_SCTP_ENABLED|SCTP_PR_SCTP_BUFFER)) == SCTP_PR_SCTP_ENABLED) {
/* 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 (chk->sent != SCTP_DATAGRAM_RESEND) {
stcb->asoc.sent_queue_retran_cnt++;
num_mk++;
if (fir == 0) {
fir = 1;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("First TSN marked was %x\n",
chk->rec.data.TSN_seq);
}
#endif
#ifdef SCTP_FR_LOGGING
tsnfirst = chk->rec.data.TSN_seq;
#endif
}
#ifdef SCTP_FR_LOGGING
tsnlast = chk->rec.data.TSN_seq;
sctp_log_fr(chk->rec.data.TSN_seq, chk->snd_count,
0, SCTP_FR_T3_MARKED);
#endif
}
chk->sent = SCTP_DATAGRAM_RESEND;
/* reset the TSN for striking and other FR stuff */
chk->rec.data.doing_fast_retransmit = 0;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER3) {
printf("mark TSN:%x for retransmission\n", chk->rec.data.TSN_seq);
}
#endif /* SCTP_DEBUG */
/* Clear any time so NO RTT is being done */
chk->do_rtt = 0;
/* Bump up the count */
if (compare_with_wrap(chk->rec.data.TSN_seq,
stcb->asoc.t3timeout_highest_marked,
MAX_TSN)) {
/* TSN_seq > than t3timeout so update */
stcb->asoc.t3timeout_highest_marked = chk->rec.data.TSN_seq;
}
if (alt != net) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = alt;
alt->ref_count++;
}
if ((chk->rec.data.state_flags & SCTP_WINDOW_PROBE) !=
SCTP_WINDOW_PROBE) {
non_win_probes++;
} else {
chk->rec.data.state_flags &= ~SCTP_WINDOW_PROBE;
win_probes++;
}
}
if (chk->sent == SCTP_DATAGRAM_RESEND) {
cnt_mk++;
}
}
#ifdef SCTP_FR_LOGGING
sctp_log_fr(tsnfirst, tsnlast, num_mk, SCTP_FR_T3_TIMEOUT);
#endif
/* compensate for the number we marked */
stcb->asoc.peers_rwnd += (num_mk /* * sizeof(struct mbuf)*/);
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
if (num_mk) {
#ifdef SCTP_FR_LOGGING
printf("LAST TSN marked was %x\n", tsnlast);
#endif
printf("Num marked for retransmission was %d peer-rwd:%ld\n",
num_mk, (u_long)stcb->asoc.peers_rwnd);
#ifdef SCTP_FR_LOGGING
printf("LAST TSN marked was %x\n", tsnlast);
#endif
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 != cnt_mk) {
printf("Local Audit says there are %d for retran asoc cnt:%d\n",
cnt_mk, stcb->asoc.sent_queue_retran_cnt);
#ifndef SCTP_AUDITING_ENABLED
stcb->asoc.sent_queue_retran_cnt = cnt_mk;
#endif
}
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER3) {
printf("**************************\n");
}
#endif /* SCTP_DEBUG */
/* 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 == SCTP_ECN_ECHO)) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = alt;
if (chk->sent != SCTP_DATAGRAM_RESEND) {
chk->sent = SCTP_DATAGRAM_RESEND;
stcb->asoc.sent_queue_retran_cnt++;
}
alt->ref_count++;
}
}
if ((orig_rwnd == 0) && (stcb->asoc.total_flight == 0) &&
(orig_flight <= net->mtu)) {
/*
* If the LAST packet sent was not acked and our rwnd is 0
* then we are in a win-probe state.
*/
win_probes = 1;
non_win_probes = 0;
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("WIN_PROBE set via o_rwnd=0 tf=0 and all:%d fit in mtu:%d\n",
orig_flight, net->mtu);
}
#endif
}
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 */
if (win_probes && (non_win_probes == 0)) {
return (1);
}
return (0);
}
/*
* 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(chk, &outs->outqueue, sctp_next) {
if (chk->whoTo == net) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = alt;
alt->ref_count++;
}
}
}
/* 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;
alt->ref_count++;
}
}
}
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);
#endif
/* Find an alternate and mark those for retransmission */
alt = sctp_find_alternate_net(stcb, net);
win_probe = sctp_mark_all_for_resend(stcb, net, alt, &num_mk);
/* FR Loss recovery just ended with the T3. */
stcb->asoc.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
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("Special cookie case return\n");
}
#endif /* SCTP_DEBUG */
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.
*/
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("Forward TSN time\n");
}
#endif /* SCTP_DEBUG */
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);
}
}
}
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_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);
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 == SCTP_COOKIE_ECHO) {
break;
}
}
if (cookie == NULL) {
if (SCTP_GET_STATE(&stcb->asoc) == SCTP_STATE_COOKIE_ECHOED) {
/* FOOBAR! */
struct mbuf *oper;
MGET(oper, M_DONTWAIT, MT_DATA);
if (oper) {
struct sctp_paramhdr *ph;
u_int32_t *ippp;
oper->m_len = sizeof(struct sctp_paramhdr) +
sizeof(*ippp);
ph = mtod(oper, struct sctp_paramhdr *);
ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION);
ph->param_length = htons(oper->m_len);
ippp = (u_int32_t *)(ph + 1);
*ippp = htonl(0x40000002);
}
sctp_abort_an_association(inp, stcb, SCTP_INTERNAL_ERROR,
oper);
}
return (1);
}
/* 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);
if (alt != cookie->whoTo) {
sctp_free_remote_addr(cookie->whoTo);
cookie->whoTo = alt;
alt->ref_count++;
}
/* Now mark the retran info */
if (cookie->sent != SCTP_DATAGRAM_RESEND) {
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, *chk;
struct sctp_stream_reset_req *strreq;
/* find the existing STRRESET */
TAILQ_FOREACH(strrst, &stcb->asoc.control_send_queue,
sctp_next) {
if (strrst->rec.chunk_id == SCTP_STREAM_RESET) {
/* is it what we want */
strreq = mtod(strrst->data, struct sctp_stream_reset_req *);
if (strreq->sr_req.ph.param_type == ntohs(SCTP_STR_RESET_REQUEST)) {
break;
}
}
}
if (strrst == NULL) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("Strange, strreset timer fires, but I can't find an str-reset?\n");
}
#endif /* SCTP_DEBUG */
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);
sctp_free_remote_addr(strrst->whoTo);
strrst->whoTo = alt;
alt->ref_count++;
/* 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 == SCTP_ECN_ECHO)) {
sctp_free_remote_addr(chk->whoTo);
if (chk->sent != SCTP_DATAGRAM_RESEND) {
chk->sent = SCTP_DATAGRAM_RESEND;
stcb->asoc.sent_queue_retran_cnt++;
}
chk->whoTo = alt;
alt->ref_count++;
}
}
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)
stcb->asoc.sent_queue_retran_cnt++;
strrst->sent = SCTP_DATAGRAM_RESEND;
/* 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 == SCTP_ASCONF) {
break;
}
}
if (asconf == NULL) {
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
printf("Strange, asconf timer fires, but I can't find an asconf?\n");
}
#endif /* SCTP_DEBUG */
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 management 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);
sctp_free_remote_addr(asconf->whoTo);
asconf->whoTo = alt;
alt->ref_count++;
/* 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 == SCTP_ECN_ECHO)) {
sctp_free_remote_addr(chk->whoTo);
chk->whoTo = alt;
if (chk->sent != SCTP_DATAGRAM_RESEND) {
chk->sent = SCTP_DATAGRAM_RESEND;
stcb->asoc.sent_queue_retran_cnt++;
}
alt->ref_count++;
}
}
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)
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 management */
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);
/* third generate a shutdown into the queue for out net */
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("%s:%d sends a shutdown\n",
__FILE__,
__LINE__
);
}
#endif
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 management */
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);
/* third generate a shutdown into the queue for out net */
sctp_send_shutdown_ack(stcb, alt);
if ((stcb == NULL) || (inp == NULL))
return;
if (TAILQ_EMPTY(&stcb->asoc.out_wheel)) {
printf("Strange, out_wheel empty nothing on sent/send and tot=%lu?\n",
(u_long)stcb->asoc.total_output_queue_size);
stcb->asoc.total_output_queue_size = 0;
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;
}
/* 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(chk, &outs->outqueue, sctp_next) {
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, 1);
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 */
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=0;
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;
}
}
TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
(net->dest_state & SCTP_ADDR_REACHABLE)) {
cnt_of_unconf++;
}
}
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 management, pick a new dest */
if (sctp_send_hb(stcb, 0, NULL) < 0) {
return (1);
}
if (cnt_of_unconf > 1) {
/*
* this will send out extra hb's up to maxburst if
* there are any unconfirmed addresses.
*/
int cnt_sent = 1;
while ((cnt_sent < stcb->asoc.max_burst) && (cnt_of_unconf > 1)) {
if (sctp_send_hb(stcb, 0, NULL) == 0)
break;
cnt_of_unconf--;
cnt_sent++;
}
}
return (0);
}
static u_int32_t
sctp_getnext_mtu(struct sctp_inpcb *inp, u_int32_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);
}
/* restart the timer in any case */
next_mtu = sctp_getnext_mtu(inp, net->mtu);
if (next_mtu <= net->mtu) {
/* nothing to do */
return;
}
rt = rtcache_validate(&net->ro);
if (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 (rt->rt_ifp != NULL) {
if (rt->rt_ifp->if_mtu > next_mtu) {
/* ok it will fit out the door */
net->mtu = next_mtu;
}
}
rtcache_unref(rt, &net->ro);
}
/* restart the timer */
sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, inp, stcb, net);
}
SCTP_GETTIME_TIMEVAL(&tn);
if (stcb->asoc.sctp_autoclose_ticks &&
(inp->sctp_flags & 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 = ((tn.tv_sec - tim_touse->tv_sec) * hz);
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, 9);
/* 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 */
#ifdef SCTP_DEBUG
if (sctp_debug_on & SCTP_DEBUG_OUTPUT4) {
printf("%s:%d sends a shutdown\n",
__FILE__,
__LINE__
);
}
#endif
sctp_send_shutdown(stcb, stcb->asoc.primary_destination);
asoc->state = SCTP_STATE_SHUTDOWN_SENT;
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 cnt= 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,
* but I am paranoid.
*/
SCTP_INP_INFO_WUNLOCK();
callout_stop(&it->tmr.timer);
if (it->function_atend != NULL) {
(*it->function_atend)(it->pointer, it->val);
}
callout_destroy(&it->tmr.timer);
free(it, M_PCB);
return;
}
select_a_new_ep:
SCTP_INP_WLOCK(it->inp);
while ((it->pcb_flags) && ((it->inp->sctp_flags & it->pcb_flags) != it->pcb_flags)) {
/* we do not like this ep */
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, we must wait for other iterator at %p\n",
it->inp);
SCTP_INP_WUNLOCK(it->inp);
goto start_timer_return;
}
/* now we do the actual write to this guy */
it->inp->inp_starting_point_for_iterator = it;
SCTP_INP_WUNLOCK(it->inp);
SCTP_INP_RLOCK(it->inp);
/* if we reach here we found a inp acceptable, now through each
* one that has the association in the right state
*/
if (it->stcb == NULL) {
it->stcb = LIST_FIRST(&it->inp->sctp_asoc_list);
}
if (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)) {
SCTP_TCB_UNLOCK(it->stcb);
it->stcb = LIST_NEXT(it->stcb, sctp_tcblist);
continue;
}
cnt++;
/* run function on this one */
SCTP_INP_RUNLOCK(it->inp);
(*it->function_toapply)(it->inp, it->stcb, it->pointer, it->val);
sctp_chunk_output(it->inp, it->stcb, 1);
SCTP_TCB_UNLOCK(it->stcb);
/* see if we have limited out */
if (cnt > SCTP_MAX_ITERATOR_AT_ONCE) {
it->stcb->asoc.stcb_starting_point_for_iterator = it;
start_timer_return:
SCTP_ITERATOR_UNLOCK();
sctp_timer_start(SCTP_TIMER_TYPE_ITERATOR, (struct sctp_inpcb *)it, NULL, NULL);
return;
}
SCTP_INP_RLOCK(it->inp);
it->stcb = LIST_NEXT(it->stcb, sctp_tcblist);
}
/* if we reach here, we ran out of stcb's in the inp we are looking at */
SCTP_INP_RUNLOCK(it->inp);
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;
}
