Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 6421 insertions, 0 deletions

diff --git a/netwerk/sctp/src/netinet/sctp_input.c b/netwerk/sctp/src/netinet/sctp_input.c
new file mode 100644
index 0000000000..4c58763c6d
--- /dev/null
+++ b/netwerk/sctp/src/netinet/sctp_input.c
@@ -0,0 +1,6421 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2001-2008, 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.
+ */
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#endif
+
+#include <netinet/sctp_os.h>
+#include <netinet/sctp_var.h>
+#include <netinet/sctp_sysctl.h>
+#include <netinet/sctp_pcb.h>
+#include <netinet/sctp_header.h>
+#include <netinet/sctputil.h>
+#include <netinet/sctp_output.h>
+#include <netinet/sctp_input.h>
+#include <netinet/sctp_auth.h>
+#include <netinet/sctp_indata.h>
+#include <netinet/sctp_asconf.h>
+#include <netinet/sctp_bsd_addr.h>
+#include <netinet/sctp_timer.h>
+#include <netinet/sctp_crc32.h>
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#include <netinet/sctp_kdtrace.h>
+#endif
+#if defined(INET) || defined(INET6)
+#if !defined(_WIN32)
+#include <netinet/udp.h>
+#endif
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#include <sys/smp.h>
+#endif
+
+static void
+sctp_stop_all_cookie_timers(struct sctp_tcb *stcb)
+{
+	struct sctp_nets *net;
+
+	/* This now not only stops all cookie timers
+	 * it also stops any INIT timers as well. This
+	 * will make sure that the timers are stopped in
+	 * all collision cases.
+	 */
+	SCTP_TCB_LOCK_ASSERT(stcb);
+	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+		if (net->rxt_timer.type == SCTP_TIMER_TYPE_COOKIE) {
+			sctp_timer_stop(SCTP_TIMER_TYPE_COOKIE,
+					stcb->sctp_ep,
+					stcb,
+					net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_1);
+		} else if (net->rxt_timer.type == SCTP_TIMER_TYPE_INIT) {
+			sctp_timer_stop(SCTP_TIMER_TYPE_INIT,
+					stcb->sctp_ep,
+					stcb,
+					net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_2);
+		}
+	}
+}
+
+/* INIT handler */
+static void
+sctp_handle_init(struct mbuf *m, int iphlen, int offset,
+                 struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+                 struct sctp_init_chunk *cp, struct sctp_inpcb *inp,
+                 struct sctp_tcb *stcb, struct sctp_nets *net,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+                 uint8_t mflowtype, uint32_t mflowid,
+#endif
+                 uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_init *init;
+	struct mbuf *op_err;
+
+	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_init: handling INIT tcb:%p\n",
+		(void *)stcb);
+	if (stcb == NULL) {
+		SCTP_INP_RLOCK(inp);
+	}
+	/* Validate parameters */
+	init = &cp->init;
+	if (ntohl(init->initiate_tag) == 0) {
+		goto outnow;
+	}
+	if ((ntohl(init->a_rwnd) < SCTP_MIN_RWND) ||
+	    (ntohs(init->num_inbound_streams) == 0) ||
+	    (ntohs(init->num_outbound_streams) == 0)) {
+		/* protocol error... send abort */
+		op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+		sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                mflowtype, mflowid, inp->fibnum,
+#endif
+		                vrf_id, port);
+		goto outnow;
+	}
+	if (sctp_validate_init_auth_params(m, offset + sizeof(*cp),
+					   offset + ntohs(cp->ch.chunk_length))) {
+		/* auth parameter(s) error... send abort */
+		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+		                             "Problem with AUTH parameters");
+		sctp_send_abort(m, iphlen, src, dst, sh, init->initiate_tag, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                mflowtype, mflowid, inp->fibnum,
+#endif
+		                vrf_id, port);
+		goto outnow;
+	}
+	/* We are only accepting if we have a listening socket.*/
+	if ((stcb == NULL) &&
+	    ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
+	     (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
+	     (!SCTP_IS_LISTENING(inp)))) {
+		/*
+		 * FIX ME ?? What about TCP model and we have a
+		 * match/restart case? Actually no fix is needed.
+		 * the lookup will always find the existing assoc so stcb
+		 * would not be NULL. It may be questionable to do this
+		 * since we COULD just send back the INIT-ACK and hope that
+		 * the app did accept()'s by the time the COOKIE was sent. But
+		 * there is a price to pay for COOKIE generation and I don't
+		 * want to pay it on the chance that the app will actually do
+		 * some accepts(). The App just looses and should NOT be in
+		 * this state :-)
+		 */
+		if (SCTP_BASE_SYSCTL(sctp_blackhole) == 0) {
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             "No listener");
+			sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                mflowtype, mflowid, inp->fibnum,
+#endif
+			                vrf_id, port);
+		}
+		goto outnow;
+	}
+	if ((stcb != NULL) &&
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT)) {
+		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending SHUTDOWN-ACK\n");
+		sctp_send_shutdown_ack(stcb, NULL);
+		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+	} else {
+		SCTPDBG(SCTP_DEBUG_INPUT3, "sctp_handle_init: sending INIT-ACK\n");
+		sctp_send_initiate_ack(inp, stcb, net, m, iphlen, offset,
+		                       src, dst, sh, cp,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, port);
+	}
+ outnow:
+	if (stcb == NULL) {
+		SCTP_INP_RUNLOCK(inp);
+	}
+}
+
+/*
+ * process peer "INIT/INIT-ACK" chunk returns value < 0 on error
+ */
+
+int
+sctp_is_there_unsent_data(struct sctp_tcb *stcb, int so_locked)
+{
+	int unsent_data;
+	unsigned int i;
+	struct sctp_stream_queue_pending *sp;
+	struct sctp_association *asoc;
+
+	SCTP_TCB_LOCK_ASSERT(stcb);
+
+	/* This function returns if any stream has true unsent data on it.
+	 * Note that as it looks through it will clean up any places that
+	 * have old data that has been sent but left at top of stream queue.
+	 */
+	asoc = &stcb->asoc;
+	unsent_data = 0;
+	if (!stcb->asoc.ss_functions.sctp_ss_is_empty(stcb, asoc)) {
+		/* Check to see if some data queued */
+		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+			/*sa_ignore FREED_MEMORY*/
+			sp = TAILQ_FIRST(&stcb->asoc.strmout[i].outqueue);
+			if (sp == NULL) {
+				continue;
+			}
+			if ((sp->msg_is_complete) &&
+			    (sp->length == 0) &&
+			    (sp->sender_all_done)) {
+				/* We are doing differed cleanup. Last
+				 * time through when we took all the data
+				 * the sender_all_done was not set.
+				 */
+				if (sp->put_last_out == 0) {
+					SCTP_PRINTF("Gak, put out entire msg with NO end!-1\n");
+					SCTP_PRINTF("sender_done:%d len:%d msg_comp:%d put_last_out:%d\n",
+					            sp->sender_all_done,
+					            sp->length,
+					            sp->msg_is_complete,
+					            sp->put_last_out);
+				}
+				atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
+				TAILQ_REMOVE(&stcb->asoc.strmout[i].outqueue, sp, next);
+				stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, &asoc->strmout[i], sp);
+				if (sp->net) {
+					sctp_free_remote_addr(sp->net);
+					sp->net = NULL;
+				}
+				if (sp->data) {
+					sctp_m_freem(sp->data);
+					sp->data = NULL;
+				}
+				sctp_free_a_strmoq(stcb, sp, so_locked);
+				if (!TAILQ_EMPTY(&stcb->asoc.strmout[i].outqueue)) {
+					unsent_data++;
+				}
+			} else {
+				unsent_data++;
+			}
+			if (unsent_data > 0) {
+				break;
+			}
+		}
+	}
+	return (unsent_data);
+}
+
+static int
+sctp_process_init(struct sctp_init_chunk *cp, struct sctp_tcb *stcb)
+{
+	struct sctp_init *init;
+	struct sctp_association *asoc;
+	struct sctp_nets *lnet;
+	unsigned int i;
+
+	SCTP_TCB_LOCK_ASSERT(stcb);
+
+	init = &cp->init;
+	asoc = &stcb->asoc;
+	/* save off parameters */
+	asoc->peer_vtag = ntohl(init->initiate_tag);
+	asoc->peers_rwnd = ntohl(init->a_rwnd);
+	/* init tsn's */
+	asoc->highest_tsn_inside_map = asoc->asconf_seq_in = ntohl(init->initial_tsn) - 1;
+
+	if (!TAILQ_EMPTY(&asoc->nets)) {
+		/* update any ssthresh's that may have a default */
+		TAILQ_FOREACH(lnet, &asoc->nets, sctp_next) {
+			lnet->ssthresh = asoc->peers_rwnd;
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_CWND_MONITOR_ENABLE|SCTP_CWND_LOGGING_ENABLE)) {
+				sctp_log_cwnd(stcb, lnet, 0, SCTP_CWND_INITIALIZATION);
+			}
+		}
+	}
+	if (asoc->pre_open_streams > ntohs(init->num_inbound_streams)) {
+		unsigned int newcnt;
+		struct sctp_stream_out *outs;
+		struct sctp_stream_queue_pending *sp, *nsp;
+		struct sctp_tmit_chunk *chk, *nchk;
+
+		/* abandon the upper streams */
+		newcnt = ntohs(init->num_inbound_streams);
+		TAILQ_FOREACH_SAFE(chk, &asoc->send_queue, sctp_next, nchk) {
+			if (chk->rec.data.sid >= newcnt) {
+				TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
+				asoc->send_queue_cnt--;
+				if (asoc->strmout[chk->rec.data.sid].chunks_on_queues > 0) {
+					asoc->strmout[chk->rec.data.sid].chunks_on_queues--;
+#ifdef INVARIANTS
+				} else {
+					panic("No chunks on the queues for sid %u.", chk->rec.data.sid);
+#endif
+				}
+				if (chk->data != NULL) {
+					sctp_free_bufspace(stcb, asoc, chk, 1);
+					sctp_ulp_notify(SCTP_NOTIFY_UNSENT_DG_FAIL, stcb,
+					                0, chk, SCTP_SO_NOT_LOCKED);
+					if (chk->data) {
+						sctp_m_freem(chk->data);
+						chk->data = NULL;
+					}
+				}
+				sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+				/*sa_ignore FREED_MEMORY*/
+			}
+		}
+		if (asoc->strmout) {
+			for (i = newcnt; i < asoc->pre_open_streams; i++) {
+				outs = &asoc->strmout[i];
+				TAILQ_FOREACH_SAFE(sp, &outs->outqueue, next, nsp) {
+					atomic_subtract_int(&stcb->asoc.stream_queue_cnt, 1);
+					TAILQ_REMOVE(&outs->outqueue, sp, next);
+					stcb->asoc.ss_functions.sctp_ss_remove_from_stream(stcb, asoc, outs, sp);
+					sctp_ulp_notify(SCTP_NOTIFY_SPECIAL_SP_FAIL,
+					    stcb, 0, sp, SCTP_SO_NOT_LOCKED);
+					if (sp->data) {
+						sctp_m_freem(sp->data);
+						sp->data = NULL;
+					}
+					if (sp->net) {
+						sctp_free_remote_addr(sp->net);
+						sp->net = NULL;
+					}
+					/* Free the chunk */
+					sctp_free_a_strmoq(stcb, sp, SCTP_SO_NOT_LOCKED);
+					/*sa_ignore FREED_MEMORY*/
+				}
+				outs->state = SCTP_STREAM_CLOSED;
+			}
+		}
+		/* cut back the count */
+		asoc->pre_open_streams = newcnt;
+	}
+	asoc->streamoutcnt = asoc->pre_open_streams;
+	if (asoc->strmout) {
+		for (i = 0; i < asoc->streamoutcnt; i++) {
+			asoc->strmout[i].state = SCTP_STREAM_OPEN;
+		}
+	}
+	/* EY - nr_sack: initialize highest tsn in nr_mapping_array */
+	asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+		sctp_log_map(0, 5, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+	}
+	/* This is the next one we expect */
+	asoc->str_reset_seq_in = asoc->asconf_seq_in + 1;
+
+	asoc->mapping_array_base_tsn = ntohl(init->initial_tsn);
+	asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->asconf_seq_in;
+
+	asoc->advanced_peer_ack_point = asoc->last_acked_seq;
+	/* open the requested streams */
+
+	if (asoc->strmin != NULL) {
+		/* Free the old ones */
+		for (i = 0; i < asoc->streamincnt; i++) {
+			sctp_clean_up_stream(stcb, &asoc->strmin[i].inqueue);
+			sctp_clean_up_stream(stcb, &asoc->strmin[i].uno_inqueue);
+		}
+		SCTP_FREE(asoc->strmin, SCTP_M_STRMI);
+	}
+	if (asoc->max_inbound_streams > ntohs(init->num_outbound_streams)) {
+		asoc->streamincnt = ntohs(init->num_outbound_streams);
+	} else {
+		asoc->streamincnt = asoc->max_inbound_streams;
+	}
+	SCTP_MALLOC(asoc->strmin, struct sctp_stream_in *, asoc->streamincnt *
+		    sizeof(struct sctp_stream_in), SCTP_M_STRMI);
+	if (asoc->strmin == NULL) {
+		/* we didn't get memory for the streams! */
+		SCTPDBG(SCTP_DEBUG_INPUT2, "process_init: couldn't get memory for the streams!\n");
+		return (-1);
+	}
+	for (i = 0; i < asoc->streamincnt; i++) {
+		asoc->strmin[i].sid = i;
+		asoc->strmin[i].last_mid_delivered = 0xffffffff;
+		TAILQ_INIT(&asoc->strmin[i].inqueue);
+		TAILQ_INIT(&asoc->strmin[i].uno_inqueue);
+		asoc->strmin[i].pd_api_started = 0;
+		asoc->strmin[i].delivery_started = 0;
+	}
+	/*
+	 * load_address_from_init will put the addresses into the
+	 * association when the COOKIE is processed or the INIT-ACK is
+	 * processed. Both types of COOKIE's existing and new call this
+	 * routine. It will remove addresses that are no longer in the
+	 * association (for the restarting case where addresses are
+	 * removed). Up front when the INIT arrives we will discard it if it
+	 * is a restart and new addresses have been added.
+	 */
+	/* sa_ignore MEMLEAK */
+	return (0);
+}
+
+/*
+ * INIT-ACK message processing/consumption returns value < 0 on error
+ */
+static int
+sctp_process_init_ack(struct mbuf *m, int iphlen, int offset,
+                      struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+                      struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
+                      struct sctp_nets *net, int *abort_no_unlock,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		      uint8_t mflowtype, uint32_t mflowid,
+#endif
+                      uint32_t vrf_id)
+{
+	struct sctp_association *asoc;
+	struct mbuf *op_err;
+	int retval, abort_flag, cookie_found;
+	int initack_limit;
+	int nat_friendly = 0;
+
+	/* First verify that we have no illegal param's */
+	abort_flag = 0;
+	cookie_found = 0;
+
+	op_err = sctp_arethere_unrecognized_parameters(m,
+						       (offset + sizeof(struct sctp_init_chunk)),
+						       &abort_flag, (struct sctp_chunkhdr *)cp,
+						       &nat_friendly, &cookie_found);
+	if (abort_flag) {
+		/* Send an abort and notify peer */
+		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+		                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, net->port);
+		*abort_no_unlock = 1;
+		return (-1);
+	}
+	if (!cookie_found) {
+		uint16_t len;
+
+		/* Only report the missing cookie parameter */
+		if (op_err != NULL) {
+			sctp_m_freem(op_err);
+		}
+		len = (uint16_t)(sizeof(struct sctp_error_missing_param) + sizeof(uint16_t));
+		/* We abort with an error of missing mandatory param */
+		op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
+		if (op_err != NULL) {
+			struct sctp_error_missing_param *cause;
+
+			SCTP_BUF_LEN(op_err) = len;
+			cause = mtod(op_err, struct sctp_error_missing_param *);
+			/* Subtract the reserved param */
+			cause->cause.code = htons(SCTP_CAUSE_MISSING_PARAM);
+			cause->cause.length = htons(len);
+			cause->num_missing_params = htonl(1);
+			cause->type[0] = htons(SCTP_STATE_COOKIE);
+		}
+		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+		                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, net->port);
+		*abort_no_unlock = 1;
+		return (-3);
+	}
+	asoc = &stcb->asoc;
+	asoc->peer_supports_nat = (uint8_t)nat_friendly;
+	/* process the peer's parameters in the INIT-ACK */
+	if (sctp_process_init((struct sctp_init_chunk *)cp, stcb) < 0) {
+		if (op_err != NULL) {
+			sctp_m_freem(op_err);
+		}
+		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+		SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
+		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+		                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, net->port);
+		*abort_no_unlock = 1;
+		return (-1);
+	}
+	initack_limit = offset + ntohs(cp->ch.chunk_length);
+	/* load all addresses */
+	if ((retval = sctp_load_addresses_from_init(stcb, m,
+	                                            offset + sizeof(struct sctp_init_chunk),
+	                                            initack_limit, src, dst, NULL, stcb->asoc.port)) < 0) {
+		if (op_err != NULL) {
+			sctp_m_freem(op_err);
+		}
+		op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+		                             "Problem with address parameters");
+		SCTPDBG(SCTP_DEBUG_INPUT1,
+		        "Load addresses from INIT causes an abort %d\n",
+		        retval);
+		sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+		                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, net->port);
+		*abort_no_unlock = 1;
+		return (-1);
+	}
+	/* if the peer doesn't support asconf, flush the asconf queue */
+	if (asoc->asconf_supported == 0) {
+		struct sctp_asconf_addr *param, *nparam;
+
+		TAILQ_FOREACH_SAFE(param, &asoc->asconf_queue, next, nparam) {
+			TAILQ_REMOVE(&asoc->asconf_queue, param, next);
+			SCTP_FREE(param, SCTP_M_ASC_ADDR);
+		}
+	}
+
+	stcb->asoc.peer_hmac_id = sctp_negotiate_hmacid(stcb->asoc.peer_hmacs,
+	    stcb->asoc.local_hmacs);
+	if (op_err) {
+		sctp_queue_op_err(stcb, op_err);
+		/* queuing will steal away the mbuf chain to the out queue */
+		op_err = NULL;
+	}
+	/* extract the cookie and queue it to "echo" it back... */
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+			       stcb->asoc.overall_error_count,
+			       0,
+			       SCTP_FROM_SCTP_INPUT,
+			       __LINE__);
+	}
+	stcb->asoc.overall_error_count = 0;
+	net->error_count = 0;
+
+	/*
+	 * Cancel the INIT timer, We do this first before queueing the
+	 * cookie. We always cancel at the primary to assume that we are
+	 * canceling the timer started by the INIT which always goes to the
+	 * primary.
+	 */
+	sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep, stcb,
+	    asoc->primary_destination, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
+
+	/* calculate the RTO */
+	sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
+	                   SCTP_RTT_FROM_NON_DATA);
+#if defined(__Userspace__)
+	if (stcb->sctp_ep->recv_callback) {
+		if (stcb->sctp_socket) {
+			uint32_t inqueue_bytes, sb_free_now;
+			struct sctp_inpcb *inp;
+
+			inp = stcb->sctp_ep;
+			inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * sizeof(struct sctp_data_chunk));
+			sb_free_now = SCTP_SB_LIMIT_SND(stcb->sctp_socket) - (inqueue_bytes + stcb->asoc.sb_send_resv);
+
+			/* check if the amount free in the send socket buffer crossed the threshold */
+			if (inp->send_callback &&
+			    (((inp->send_sb_threshold > 0) &&
+			      (sb_free_now >= inp->send_sb_threshold) &&
+			      (stcb->asoc.chunks_on_out_queue <= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue))) ||
+			     (inp->send_sb_threshold == 0))) {
+				atomic_add_int(&stcb->asoc.refcnt, 1);
+				SCTP_TCB_UNLOCK(stcb);
+				inp->send_callback(stcb->sctp_socket, sb_free_now, inp->ulp_info);
+				SCTP_TCB_LOCK(stcb);
+				atomic_subtract_int(&stcb->asoc.refcnt, 1);
+			}
+		}
+	}
+#endif
+	retval = sctp_send_cookie_echo(m, offset, initack_limit, stcb, net);
+	return (retval);
+}
+
+static void
+sctp_handle_heartbeat_ack(struct sctp_heartbeat_chunk *cp,
+    struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+	union sctp_sockstore store;
+	struct sctp_nets *r_net, *f_net;
+	struct timeval tv;
+	int req_prim = 0;
+	uint16_t old_error_counter;
+
+	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_heartbeat_chunk)) {
+		/* Invalid length */
+		return;
+	}
+
+	memset(&store, 0, sizeof(store));
+	switch (cp->heartbeat.hb_info.addr_family) {
+#ifdef INET
+	case AF_INET:
+		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in)) {
+			store.sin.sin_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SIN_LEN
+			store.sin.sin_len = cp->heartbeat.hb_info.addr_len;
+#endif
+			store.sin.sin_port = stcb->rport;
+			memcpy(&store.sin.sin_addr, cp->heartbeat.hb_info.address,
+			       sizeof(store.sin.sin_addr));
+		} else {
+			return;
+		}
+		break;
+#endif
+#ifdef INET6
+	case AF_INET6:
+		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_in6)) {
+			store.sin6.sin6_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SIN6_LEN
+			store.sin6.sin6_len = cp->heartbeat.hb_info.addr_len;
+#endif
+			store.sin6.sin6_port = stcb->rport;
+			memcpy(&store.sin6.sin6_addr, cp->heartbeat.hb_info.address, sizeof(struct in6_addr));
+		} else {
+			return;
+		}
+		break;
+#endif
+#if defined(__Userspace__)
+	case AF_CONN:
+		if (cp->heartbeat.hb_info.addr_len == sizeof(struct sockaddr_conn)) {
+			store.sconn.sconn_family = cp->heartbeat.hb_info.addr_family;
+#ifdef HAVE_SCONN_LEN
+			store.sconn.sconn_len = cp->heartbeat.hb_info.addr_len;
+#endif
+			store.sconn.sconn_port = stcb->rport;
+			memcpy(&store.sconn.sconn_addr, cp->heartbeat.hb_info.address, sizeof(void *));
+		} else {
+			return;
+		}
+		break;
+#endif
+	default:
+		return;
+	}
+	r_net = sctp_findnet(stcb, &store.sa);
+	if (r_net == NULL) {
+		SCTPDBG(SCTP_DEBUG_INPUT1, "Huh? I can't find the address I sent it to, discard\n");
+		return;
+	}
+	if ((r_net && (r_net->dest_state & SCTP_ADDR_UNCONFIRMED)) &&
+	    (r_net->heartbeat_random1 == cp->heartbeat.hb_info.random_value1) &&
+	    (r_net->heartbeat_random2 == cp->heartbeat.hb_info.random_value2)) {
+		/*
+		 * If the its a HB and it's random value is correct when can
+		 * confirm the destination.
+		 */
+		r_net->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
+		if (r_net->dest_state & SCTP_ADDR_REQ_PRIMARY) {
+			stcb->asoc.primary_destination = r_net;
+			r_net->dest_state &= ~SCTP_ADDR_REQ_PRIMARY;
+			f_net = TAILQ_FIRST(&stcb->asoc.nets);
+			if (f_net != r_net) {
+				/* first one on the list is NOT the primary
+				 * sctp_cmpaddr() is much more efficient if
+				 * the primary is the first on the list, make it
+				 * so.
+				 */
+				TAILQ_REMOVE(&stcb->asoc.nets, r_net, sctp_next);
+				TAILQ_INSERT_HEAD(&stcb->asoc.nets, r_net, sctp_next);
+			}
+			req_prim = 1;
+		}
+		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+		    stcb, 0, (void *)r_net, SCTP_SO_NOT_LOCKED);
+		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb,
+		                r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_4);
+		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
+	}
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+			       stcb->asoc.overall_error_count,
+			       0,
+			       SCTP_FROM_SCTP_INPUT,
+			       __LINE__);
+	}
+	stcb->asoc.overall_error_count = 0;
+	old_error_counter = r_net->error_count;
+	r_net->error_count = 0;
+	r_net->hb_responded = 1;
+	tv.tv_sec = cp->heartbeat.hb_info.time_value_1;
+	tv.tv_usec = cp->heartbeat.hb_info.time_value_2;
+	/* Now lets do a RTO with this */
+	sctp_calculate_rto(stcb, &stcb->asoc, r_net, &tv,
+	                   SCTP_RTT_FROM_NON_DATA);
+	if ((r_net->dest_state & SCTP_ADDR_REACHABLE) == 0) {
+		r_net->dest_state |= SCTP_ADDR_REACHABLE;
+		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
+				0, (void *)r_net, SCTP_SO_NOT_LOCKED);
+	}
+	if (r_net->dest_state & SCTP_ADDR_PF) {
+		r_net->dest_state &= ~SCTP_ADDR_PF;
+		stcb->asoc.cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
+	}
+	if (old_error_counter > 0) {
+		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
+		                stcb, r_net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_5);
+		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, r_net);
+	}
+	if (r_net == stcb->asoc.primary_destination) {
+		if (stcb->asoc.alternate) {
+			/* release the alternate, primary is good */
+			sctp_free_remote_addr(stcb->asoc.alternate);
+			stcb->asoc.alternate = NULL;
+		}
+	}
+	/* Mobility adaptation */
+	if (req_prim) {
+		if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
+		                                 SCTP_MOBILITY_BASE) ||
+		    sctp_is_mobility_feature_on(stcb->sctp_ep,
+		                                SCTP_MOBILITY_FASTHANDOFF)) &&
+		    sctp_is_mobility_feature_on(stcb->sctp_ep,
+		                                SCTP_MOBILITY_PRIM_DELETED)) {
+			sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
+			                stcb->sctp_ep, stcb, NULL,
+			                SCTP_FROM_SCTP_INPUT + SCTP_LOC_6);
+			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
+			                                SCTP_MOBILITY_FASTHANDOFF)) {
+				sctp_assoc_immediate_retrans(stcb,
+				                             stcb->asoc.primary_destination);
+			}
+			if (sctp_is_mobility_feature_on(stcb->sctp_ep,
+				                        SCTP_MOBILITY_BASE)) {
+				sctp_move_chunks_from_net(stcb,
+				                          stcb->asoc.deleted_primary);
+			}
+			sctp_delete_prim_timer(stcb->sctp_ep, stcb);
+		}
+	}
+}
+
+static int
+sctp_handle_nat_colliding_state(struct sctp_tcb *stcb)
+{
+	/*
+	 * Return 0 means we want you to proceed with the abort
+	 * non-zero means no abort processing.
+	 */
+	uint32_t new_vtag;
+	struct sctpasochead *head;
+
+	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_INP_INFO_WLOCK();
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+	} else {
+		return (0);
+	}
+	new_vtag = sctp_select_a_tag(stcb->sctp_ep, stcb->sctp_ep->sctp_lport, stcb->rport, 1);
+	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
+		/* generate a new vtag and send init */
+		LIST_REMOVE(stcb, sctp_asocs);
+		stcb->asoc.my_vtag = new_vtag;
+		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
+		/* put it in the bucket in the vtag hash of assoc's for the system */
+		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+		SCTP_INP_INFO_WUNLOCK();
+		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+		return (1);
+	} else {
+		/* treat like a case where the cookie expired i.e.:
+		* - dump current cookie.
+		* - generate a new vtag.
+		* - resend init.
+		*/
+		/* generate a new vtag and send init */
+		LIST_REMOVE(stcb, sctp_asocs);
+		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
+		sctp_stop_all_cookie_timers(stcb);
+		sctp_toss_old_cookies(stcb, &stcb->asoc);
+		stcb->asoc.my_vtag = new_vtag;
+		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag, SCTP_BASE_INFO(hashasocmark))];
+		/* put it in the bucket in the vtag hash of assoc's for the system */
+		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+		SCTP_INP_INFO_WUNLOCK();
+		sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+		return (1);
+	}
+	return (0);
+}
+
+static int
+sctp_handle_nat_missing_state(struct sctp_tcb *stcb,
+			      struct sctp_nets *net)
+{
+	/* return 0 means we want you to proceed with the abort
+	 * non-zero means no abort processing
+	 */
+	if (stcb->asoc.auth_supported == 0) {
+		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_nat_missing_state: Peer does not support AUTH, cannot send an asconf\n");
+		return (0);
+	}
+	sctp_asconf_send_nat_state_update(stcb, net);
+	return (1);
+}
+
+/* Returns 1 if the stcb was aborted, 0 otherwise */
+static int
+sctp_handle_abort(struct sctp_abort_chunk *abort,
+    struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+#endif
+	uint16_t len;
+	uint16_t error;
+
+	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: handling ABORT\n");
+	if (stcb == NULL)
+		return (0);
+
+	len = ntohs(abort->ch.chunk_length);
+	if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_error_cause)) {
+		/* Need to check the cause codes for our
+		 * two magic nat aborts which don't kill the assoc
+		 * necessarily.
+		 */
+		struct sctp_error_cause *cause;
+
+		cause = (struct sctp_error_cause *)(abort + 1);
+		error = ntohs(cause->code);
+		if (error == SCTP_CAUSE_NAT_COLLIDING_STATE) {
+			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ABORT flags:%x\n",
+			                           abort->ch.chunk_flags);
+			if (sctp_handle_nat_colliding_state(stcb)) {
+				return (0);
+			}
+		} else if (error == SCTP_CAUSE_NAT_MISSING_STATE) {
+			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ABORT flags:%x\n",
+			                           abort->ch.chunk_flags);
+			if (sctp_handle_nat_missing_state(stcb, net)) {
+				return (0);
+			}
+		}
+	} else {
+		error = 0;
+	}
+	/* stop any receive timers */
+	sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL,
+	                SCTP_FROM_SCTP_INPUT + SCTP_LOC_7);
+	/* notify user of the abort and clean up... */
+	sctp_abort_notification(stcb, true, false, error, abort, SCTP_SO_NOT_LOCKED);
+	/* free the tcb */
+	SCTP_STAT_INCR_COUNTER32(sctps_aborted);
+	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+		SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+	}
+#ifdef SCTP_ASOCLOG_OF_TSNS
+	sctp_print_out_track_log(stcb);
+#endif
+#if defined(__APPLE__) && !defined(__Userspace__)
+	so = SCTP_INP_SO(stcb->sctp_ep);
+	atomic_add_int(&stcb->asoc.refcnt, 1);
+	SCTP_TCB_UNLOCK(stcb);
+	SCTP_SOCKET_LOCK(so, 1);
+	SCTP_TCB_LOCK(stcb);
+	atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+			      SCTP_FROM_SCTP_INPUT + SCTP_LOC_8);
+#if defined(__APPLE__) && !defined(__Userspace__)
+	SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_handle_abort: finished\n");
+	return (1);
+}
+
+static void
+sctp_start_net_timers(struct sctp_tcb *stcb)
+{
+	uint32_t cnt_hb_sent;
+	struct sctp_nets *net;
+
+	cnt_hb_sent = 0;
+	TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+		/* For each network start:
+		 * 1) A pmtu timer.
+		 * 2) A HB timer
+		 * 3) If the dest in unconfirmed send
+		 *    a hb as well if under max_hb_burst have
+		 *    been sent.
+		 */
+		sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
+		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
+		if ((net->dest_state & SCTP_ADDR_UNCONFIRMED) &&
+		    (cnt_hb_sent < SCTP_BASE_SYSCTL(sctp_hb_maxburst))) {
+			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+			cnt_hb_sent++;
+		}
+	}
+	if (cnt_hb_sent) {
+		sctp_chunk_output(stcb->sctp_ep, stcb,
+				  SCTP_OUTPUT_FROM_COOKIE_ACK,
+				  SCTP_SO_NOT_LOCKED);
+	}
+}
+
+static void
+sctp_handle_shutdown(struct sctp_shutdown_chunk *cp,
+    struct sctp_tcb *stcb, struct sctp_nets *net, int *abort_flag)
+{
+	struct sctp_association *asoc;
+	int some_on_streamwheel;
+	int old_state;
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+#endif
+
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_shutdown: handling SHUTDOWN\n");
+	if (stcb == NULL)
+		return;
+	asoc = &stcb->asoc;
+	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+		return;
+	}
+	if (ntohs(cp->ch.chunk_length) != sizeof(struct sctp_shutdown_chunk)) {
+		/* Shutdown NOT the expected size */
+		return;
+	}
+	old_state = SCTP_GET_STATE(stcb);
+	sctp_update_acked(stcb, cp, abort_flag);
+	if (*abort_flag) {
+		return;
+	}
+	if (asoc->control_pdapi) {
+		/* With a normal shutdown
+		 * we assume the end of last record.
+		 */
+		SCTP_INP_READ_LOCK(stcb->sctp_ep);
+		if (asoc->control_pdapi->on_strm_q) {
+			struct sctp_stream_in *strm;
+
+			strm = &asoc->strmin[asoc->control_pdapi->sinfo_stream];
+			if (asoc->control_pdapi->on_strm_q == SCTP_ON_UNORDERED) {
+				/* Unordered */
+				TAILQ_REMOVE(&strm->uno_inqueue, asoc->control_pdapi, next_instrm);
+				asoc->control_pdapi->on_strm_q = 0;
+			} else if (asoc->control_pdapi->on_strm_q == SCTP_ON_ORDERED) {
+				/* Ordered */
+				TAILQ_REMOVE(&strm->inqueue, asoc->control_pdapi, next_instrm);
+				asoc->control_pdapi->on_strm_q = 0;
+#ifdef INVARIANTS
+			} else {
+				panic("Unknown state on ctrl:%p on_strm_q:%d",
+				      asoc->control_pdapi,
+				      asoc->control_pdapi->on_strm_q);
+#endif
+			}
+		}
+		asoc->control_pdapi->end_added = 1;
+		asoc->control_pdapi->pdapi_aborted = 1;
+		asoc->control_pdapi = NULL;
+		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		so = SCTP_INP_SO(stcb->sctp_ep);
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+			/* assoc was freed while we were unlocked */
+			SCTP_SOCKET_UNLOCK(so, 1);
+			return;
+		}
+#endif
+		if (stcb->sctp_socket) {
+			sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
+		}
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	}
+	/* goto SHUTDOWN_RECEIVED state to block new requests */
+	if (stcb->sctp_socket) {
+		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
+		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) &&
+		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
+			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_RECEIVED);
+			/* notify upper layer that peer has initiated a shutdown */
+			sctp_ulp_notify(SCTP_NOTIFY_PEER_SHUTDOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+
+			/* reset time */
+			(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
+		}
+	}
+	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_SENT) {
+		/*
+		 * stop the shutdown timer, since we WILL move to
+		 * SHUTDOWN-ACK-SENT.
+		 */
+		sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb,
+		                net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_9);
+	}
+	/* Now is there unsent data on a stream somewhere? */
+	some_on_streamwheel = sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED);
+
+	if (!TAILQ_EMPTY(&asoc->send_queue) ||
+	    !TAILQ_EMPTY(&asoc->sent_queue) ||
+	    some_on_streamwheel) {
+		/* By returning we will push more data out */
+		return;
+	} else {
+		/* no outstanding data to send, so move on... */
+		/* send SHUTDOWN-ACK */
+		/* move to SHUTDOWN-ACK-SENT state */
+		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
+		    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+		}
+		if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
+			SCTP_SET_STATE(stcb, SCTP_STATE_SHUTDOWN_ACK_SENT);
+			sctp_stop_timers_for_shutdown(stcb);
+			sctp_send_shutdown_ack(stcb, net);
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
+			                 stcb->sctp_ep, stcb, net);
+		} else if (old_state == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+			sctp_send_shutdown_ack(stcb, net);
+		}
+	}
+}
+
+static void
+sctp_handle_shutdown_ack(struct sctp_shutdown_ack_chunk *cp SCTP_UNUSED,
+                         struct sctp_tcb *stcb,
+                         struct sctp_nets *net)
+{
+	struct sctp_association *asoc;
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+
+	so = SCTP_INP_SO(stcb->sctp_ep);
+#endif
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_shutdown_ack: handling SHUTDOWN ACK\n");
+	if (stcb == NULL)
+		return;
+
+	asoc = &stcb->asoc;
+	/* process according to association state */
+	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+		/* unexpected SHUTDOWN-ACK... do OOTB handling... */
+		sctp_send_shutdown_complete(stcb, net, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		return;
+	}
+	if ((SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) &&
+	    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
+		/* unexpected SHUTDOWN-ACK... so ignore... */
+		SCTP_TCB_UNLOCK(stcb);
+		return;
+	}
+	if (asoc->control_pdapi) {
+		/* With a normal shutdown
+		 * we assume the end of last record.
+		 */
+		SCTP_INP_READ_LOCK(stcb->sctp_ep);
+		asoc->control_pdapi->end_added = 1;
+		asoc->control_pdapi->pdapi_aborted = 1;
+		asoc->control_pdapi = NULL;
+		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+			/* assoc was freed while we were unlocked */
+			SCTP_SOCKET_UNLOCK(so, 1);
+			return;
+		}
+#endif
+		sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	}
+#ifdef INVARIANTS
+	if (!TAILQ_EMPTY(&asoc->send_queue) ||
+	    !TAILQ_EMPTY(&asoc->sent_queue) ||
+	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
+		panic("Queues are not empty when handling SHUTDOWN-ACK");
+	}
+#endif
+	/* stop the timer */
+	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, net,
+	                SCTP_FROM_SCTP_INPUT + SCTP_LOC_10);
+	/* send SHUTDOWN-COMPLETE */
+	sctp_send_shutdown_complete(stcb, net, 0);
+	/* notify upper layer protocol */
+	if (stcb->sctp_socket) {
+		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
+			SCTP_SB_CLEAR(stcb->sctp_socket->so_snd);
+		}
+		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+	}
+	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
+	/* free the TCB but first save off the ep */
+#if defined(__APPLE__) && !defined(__Userspace__)
+	atomic_add_int(&stcb->asoc.refcnt, 1);
+	SCTP_TCB_UNLOCK(stcb);
+	SCTP_SOCKET_LOCK(so, 1);
+	SCTP_TCB_LOCK(stcb);
+	atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+			      SCTP_FROM_SCTP_INPUT + SCTP_LOC_11);
+#if defined(__APPLE__) && !defined(__Userspace__)
+	SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+}
+
+static void
+sctp_process_unrecog_chunk(struct sctp_tcb *stcb, uint8_t chunk_type)
+{
+	switch (chunk_type) {
+	case SCTP_ASCONF_ACK:
+	case SCTP_ASCONF:
+		sctp_asconf_cleanup(stcb);
+		break;
+	case SCTP_IFORWARD_CUM_TSN:
+	case SCTP_FORWARD_CUM_TSN:
+		stcb->asoc.prsctp_supported = 0;
+		break;
+	default:
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"Peer does not support chunk type %d (0x%x).\n",
+			chunk_type, chunk_type);
+		break;
+	}
+}
+
+/*
+ * Skip past the param header and then we will find the param that caused the
+ * problem.  There are a number of param's in a ASCONF OR the prsctp param
+ * these will turn of specific features.
+ * XXX: Is this the right thing to do?
+ */
+static void
+sctp_process_unrecog_param(struct sctp_tcb *stcb, uint16_t parameter_type)
+{
+	switch (parameter_type) {
+		/* pr-sctp draft */
+	case SCTP_PRSCTP_SUPPORTED:
+		stcb->asoc.prsctp_supported = 0;
+		break;
+	case SCTP_SUPPORTED_CHUNK_EXT:
+		break;
+		/* draft-ietf-tsvwg-addip-sctp */
+	case SCTP_HAS_NAT_SUPPORT:
+	        stcb->asoc.peer_supports_nat = 0;
+	        break;
+	case SCTP_ADD_IP_ADDRESS:
+	case SCTP_DEL_IP_ADDRESS:
+	case SCTP_SET_PRIM_ADDR:
+		stcb->asoc.asconf_supported = 0;
+		break;
+	case SCTP_SUCCESS_REPORT:
+	case SCTP_ERROR_CAUSE_IND:
+		SCTPDBG(SCTP_DEBUG_INPUT2, "Huh, the peer does not support success? or error cause?\n");
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"Turning off ASCONF to this strange peer\n");
+		stcb->asoc.asconf_supported = 0;
+		break;
+	default:
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"Peer does not support param type %d (0x%x)??\n",
+			parameter_type, parameter_type);
+		break;
+	}
+}
+
+static int
+sctp_handle_error(struct sctp_chunkhdr *ch,
+                  struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
+{
+	struct sctp_error_cause *cause;
+	struct sctp_association *asoc;
+	uint32_t remaining_length, adjust;
+	uint16_t code, cause_code, cause_length;
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+#endif
+
+	/* parse through all of the errors and process */
+	asoc = &stcb->asoc;
+	cause = (struct sctp_error_cause *)((caddr_t)ch +
+	    sizeof(struct sctp_chunkhdr));
+	remaining_length = ntohs(ch->chunk_length);
+	if (remaining_length > limit) {
+		remaining_length = limit;
+	}
+	if (remaining_length >= sizeof(struct sctp_chunkhdr)) {
+		remaining_length -= sizeof(struct sctp_chunkhdr);
+	} else {
+		remaining_length = 0;
+	}
+	code = 0;
+	while (remaining_length >= sizeof(struct sctp_error_cause)) {
+		/* Process an Error Cause */
+		cause_code = ntohs(cause->code);
+		cause_length = ntohs(cause->length);
+		if ((cause_length > remaining_length) || (cause_length == 0)) {
+			/* Invalid cause length, possibly due to truncation. */
+			SCTPDBG(SCTP_DEBUG_INPUT1, "Bogus length in cause - bytes left: %u cause length: %u\n",
+				remaining_length, cause_length);
+			return (0);
+		}
+		if (code == 0) {
+			/* report the first error cause */
+			code = cause_code;
+		}
+		switch (cause_code) {
+		case SCTP_CAUSE_INVALID_STREAM:
+		case SCTP_CAUSE_MISSING_PARAM:
+		case SCTP_CAUSE_INVALID_PARAM:
+		case SCTP_CAUSE_NO_USER_DATA:
+			SCTPDBG(SCTP_DEBUG_INPUT1, "Software error we got a %u back? We have a bug :/ (or do they?)\n",
+				cause_code);
+			break;
+		case SCTP_CAUSE_NAT_COLLIDING_STATE:
+			SCTPDBG(SCTP_DEBUG_INPUT2, "Received Colliding state, ERROR flags: %x\n",
+				ch->chunk_flags);
+			if (sctp_handle_nat_colliding_state(stcb)) {
+				return (0);
+			}
+			break;
+		case SCTP_CAUSE_NAT_MISSING_STATE:
+			SCTPDBG(SCTP_DEBUG_INPUT2, "Received missing state, ERROR flags: %x\n",
+			                           ch->chunk_flags);
+			if (sctp_handle_nat_missing_state(stcb, net)) {
+				return (0);
+			}
+			break;
+		case SCTP_CAUSE_STALE_COOKIE:
+			/*
+			 * We only act if we have echoed a cookie and are
+			 * waiting.
+			 */
+			if ((cause_length >= sizeof(struct sctp_error_stale_cookie)) &&
+			    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+				struct sctp_error_stale_cookie *stale_cookie;
+
+				stale_cookie = (struct sctp_error_stale_cookie *)cause;
+				/* stable_time is in usec, convert to msec. */
+				asoc->cookie_preserve_req = ntohl(stale_cookie->stale_time) / 1000;
+				/* Double it to be more robust on RTX. */
+				asoc->cookie_preserve_req *= 2;
+				asoc->stale_cookie_count++;
+				if (asoc->stale_cookie_count >
+				    asoc->max_init_times) {
+					sctp_abort_notification(stcb, false, true, 0, NULL, SCTP_SO_NOT_LOCKED);
+					/* now free the asoc */
+#if defined(__APPLE__) && !defined(__Userspace__)
+					so = SCTP_INP_SO(stcb->sctp_ep);
+					atomic_add_int(&stcb->asoc.refcnt, 1);
+					SCTP_TCB_UNLOCK(stcb);
+					SCTP_SOCKET_LOCK(so, 1);
+					SCTP_TCB_LOCK(stcb);
+					atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+					(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+							      SCTP_FROM_SCTP_INPUT + SCTP_LOC_12);
+#if defined(__APPLE__) && !defined(__Userspace__)
+					SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+					return (-1);
+				}
+				/* blast back to INIT state */
+				sctp_toss_old_cookies(stcb, &stcb->asoc);
+				SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_WAIT);
+				sctp_stop_all_cookie_timers(stcb);
+				sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+			}
+			break;
+		case SCTP_CAUSE_UNRESOLVABLE_ADDR:
+			/*
+			 * Nothing we can do here, we don't do hostname
+			 * addresses so if the peer does not like my IPv6
+			 * (or IPv4 for that matter) it does not matter. If
+			 * they don't support that type of address, they can
+			 * NOT possibly get that packet type... i.e. with no
+			 * IPv6 you can't receive a IPv6 packet. so we can
+			 * safely ignore this one. If we ever added support
+			 * for HOSTNAME Addresses, then we would need to do
+			 * something here.
+			 */
+			break;
+		case SCTP_CAUSE_UNRECOG_CHUNK:
+			if (cause_length >= sizeof(struct sctp_error_unrecognized_chunk)) {
+				struct sctp_error_unrecognized_chunk *unrec_chunk;
+
+				unrec_chunk = (struct sctp_error_unrecognized_chunk *)cause;
+				sctp_process_unrecog_chunk(stcb, unrec_chunk->ch.chunk_type);
+			}
+			break;
+		case SCTP_CAUSE_UNRECOG_PARAM:
+			/* XXX: We only consider the first parameter */
+			if (cause_length >= sizeof(struct sctp_error_cause) + sizeof(struct sctp_paramhdr)) {
+				struct sctp_paramhdr *unrec_parameter;
+
+				unrec_parameter = (struct sctp_paramhdr *)(cause + 1);
+				sctp_process_unrecog_param(stcb, ntohs(unrec_parameter->param_type));
+			}
+			break;
+		case SCTP_CAUSE_COOKIE_IN_SHUTDOWN:
+			/*
+			 * We ignore this since the timer will drive out a
+			 * new cookie anyway and there timer will drive us
+			 * to send a SHUTDOWN_COMPLETE. We can't send one
+			 * here since we don't have their tag.
+			 */
+			break;
+		case SCTP_CAUSE_DELETING_LAST_ADDR:
+		case SCTP_CAUSE_RESOURCE_SHORTAGE:
+		case SCTP_CAUSE_DELETING_SRC_ADDR:
+			/*
+			 * We should NOT get these here, but in a
+			 * ASCONF-ACK.
+			 */
+			SCTPDBG(SCTP_DEBUG_INPUT2, "Peer sends ASCONF errors in a error cause with code %u.\n",
+				cause_code);
+			break;
+		case SCTP_CAUSE_OUT_OF_RESC:
+			/*
+			 * And what, pray tell do we do with the fact that
+			 * the peer is out of resources? Not really sure we
+			 * could do anything but abort. I suspect this
+			 * should have came WITH an abort instead of in a
+			 * OP-ERROR.
+			 */
+			break;
+		default:
+			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_handle_error: unknown code 0x%x\n",
+				cause_code);
+			break;
+		}
+		adjust = SCTP_SIZE32(cause_length);
+		if (remaining_length >= adjust) {
+			remaining_length -= adjust;
+		} else {
+			remaining_length = 0;
+		}
+		cause = (struct sctp_error_cause *)((caddr_t)cause + adjust);
+	}
+	sctp_ulp_notify(SCTP_NOTIFY_REMOTE_ERROR, stcb, code, ch, SCTP_SO_NOT_LOCKED);
+	return (0);
+}
+
+static int
+sctp_handle_init_ack(struct mbuf *m, int iphlen, int offset,
+                     struct sockaddr *src, struct sockaddr *dst, struct sctphdr *sh,
+                     struct sctp_init_ack_chunk *cp, struct sctp_tcb *stcb,
+                     struct sctp_nets *net, int *abort_no_unlock,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+                     uint8_t mflowtype, uint32_t mflowid,
+#endif
+                     uint32_t vrf_id)
+{
+	struct sctp_init_ack *init_ack;
+	struct mbuf *op_err;
+
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_init_ack: handling INIT-ACK\n");
+
+	if (stcb == NULL) {
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"sctp_handle_init_ack: TCB is null\n");
+		return (-1);
+	}
+	/* Only process the INIT-ACK chunk in COOKIE WAIT state.*/
+	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) {
+		init_ack = &cp->init;
+		/* Validate parameters. */
+		if ((ntohl(init_ack->initiate_tag) == 0) ||
+		    (ntohl(init_ack->a_rwnd) < SCTP_MIN_RWND) ||
+		    (ntohs(init_ack->num_inbound_streams) == 0) ||
+		    (ntohs(init_ack->num_outbound_streams) == 0)) {
+			/* One of the mandatory parameters is illegal. */
+			op_err = sctp_generate_cause(SCTP_CAUSE_INVALID_PARAM, "");
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+	#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+	#endif
+			                       vrf_id, net->port);
+			*abort_no_unlock = 1;
+			return (-1);
+		}
+		if (stcb->asoc.primary_destination->dest_state &
+		    SCTP_ADDR_UNCONFIRMED) {
+			/*
+			 * The primary is where we sent the INIT, we can
+			 * always consider it confirmed when the INIT-ACK is
+			 * returned. Do this before we load addresses
+			 * though.
+			 */
+			stcb->asoc.primary_destination->dest_state &=
+			    ~SCTP_ADDR_UNCONFIRMED;
+			sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+			    stcb, 0, (void *)stcb->asoc.primary_destination, SCTP_SO_NOT_LOCKED);
+		}
+		if (sctp_process_init_ack(m, iphlen, offset, src, dst, sh, cp, stcb,
+		                          net, abort_no_unlock,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                          mflowtype, mflowid,
+#endif
+		                          vrf_id) < 0) {
+			/* error in parsing parameters */
+			return (-1);
+		}
+		/* Update our state. */
+		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to COOKIE-ECHOED state\n");
+		SCTP_SET_STATE(stcb, SCTP_STATE_COOKIE_ECHOED);
+
+		/* Reset the RTO calculation. */
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+			sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+			               stcb->asoc.overall_error_count,
+			               0,
+			               SCTP_FROM_SCTP_INPUT,
+			               __LINE__);
+		}
+		stcb->asoc.overall_error_count = 0;
+		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
+		/*
+		 * Collapse the init timer back in case of a exponential
+		 * backoff.
+		 */
+		sctp_timer_start(SCTP_TIMER_TYPE_COOKIE, stcb->sctp_ep,
+		    stcb, net);
+		/*
+		 * The output routine at the end of the inbound data processing
+		 * will cause the cookie to be sent.
+		 */
+		SCTPDBG(SCTP_DEBUG_INPUT1, "Leaving handle-init-ack end\n");
+		return (0);
+	} else {
+		return (-1);
+	}
+}
+
+static struct sctp_tcb *
+sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
+    struct sockaddr *src, struct sockaddr *dst,
+    struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+    struct sctp_inpcb *inp, struct sctp_nets **netp,
+    struct sockaddr *init_src, int *notification,
+    int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+    uint8_t mflowtype, uint32_t mflowid,
+#endif
+    uint32_t vrf_id, uint16_t port);
+
+/*
+ * handle a state cookie for an existing association m: input packet mbuf
+ * chain-- assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a
+ * "split" mbuf and the cookie signature does not exist offset: offset into
+ * mbuf to the cookie-echo chunk
+ */
+static struct sctp_tcb *
+sctp_process_cookie_existing(struct mbuf *m, int iphlen, int offset,
+    struct sockaddr *src, struct sockaddr *dst,
+    struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+    struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets **netp,
+    struct sockaddr *init_src, int *notification,
+    int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+    uint8_t mflowtype, uint32_t mflowid,
+#endif
+    uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_association *asoc;
+	struct sctp_init_chunk *init_cp, init_buf;
+	struct sctp_init_ack_chunk *initack_cp, initack_buf;
+	struct sctp_asconf_addr *aparam, *naparam;
+	struct sctp_asconf_ack *aack, *naack;
+	struct sctp_tmit_chunk *chk, *nchk;
+	struct sctp_stream_reset_list *strrst, *nstrrst;
+	struct sctp_queued_to_read *sq, *nsq;
+	struct sctp_nets *net;
+	struct mbuf *op_err;
+	struct timeval old;
+	int init_offset, initack_offset, i;
+	int retval;
+	int spec_flag = 0;
+	uint32_t how_indx;
+#if defined(SCTP_DETAILED_STR_STATS)
+	int j;
+#endif
+
+	net = *netp;
+	/* I know that the TCB is non-NULL from the caller */
+	asoc = &stcb->asoc;
+	for (how_indx = 0; how_indx  < sizeof(asoc->cookie_how); how_indx++) {
+		if (asoc->cookie_how[how_indx] == 0)
+			break;
+	}
+	if (how_indx < sizeof(asoc->cookie_how)) {
+		asoc->cookie_how[how_indx] = 1;
+	}
+	if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+		/* SHUTDOWN came in after sending INIT-ACK */
+		sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination);
+		op_err = sctp_generate_cause(SCTP_CAUSE_COOKIE_IN_SHUTDOWN, "");
+		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                   mflowtype, mflowid, inp->fibnum,
+#endif
+		                   vrf_id, net->port);
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 2;
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	/*
+	 * find and validate the INIT chunk in the cookie (peer's info) the
+	 * INIT should start after the cookie-echo header struct (chunk
+	 * header, state cookie header struct)
+	 */
+	init_offset = offset += sizeof(struct sctp_cookie_echo_chunk);
+
+	init_cp = (struct sctp_init_chunk *)
+		sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
+			      (uint8_t *) & init_buf);
+	if (init_cp == NULL) {
+		/* could not pull a INIT chunk in cookie */
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	/*
+	 * find and validate the INIT-ACK chunk in the cookie (my info) the
+	 * INIT-ACK follows the INIT chunk
+	 */
+	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
+	initack_cp = (struct sctp_init_ack_chunk *)
+		sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
+			      (uint8_t *) & initack_buf);
+	if (initack_cp == NULL) {
+		/* could not pull INIT-ACK chunk in cookie */
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+	    (ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag)) {
+		/*
+		 * case D in Section 5.2.4 Table 2: MMAA process accordingly
+		 * to get into the OPEN state
+		 */
+		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
+			/*-
+			 * Opps, this means that we somehow generated two vtag's
+			 * the same. I.e. we did:
+			 *  Us               Peer
+			 *   <---INIT(tag=a)------
+			 *   ----INIT-ACK(tag=t)-->
+			 *   ----INIT(tag=t)------> *1
+			 *   <---INIT-ACK(tag=a)---
+			 *   <----CE(tag=t)------------- *2
+			 *
+			 * At point *1 we should be generating a different
+			 * tag t'. Which means we would throw away the CE and send
+			 * ours instead. Basically this is case C (throw away side).
+			 */
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 17;
+			SCTP_TCB_UNLOCK(stcb);
+			return (NULL);
+		}
+		switch (SCTP_GET_STATE(stcb)) {
+			case SCTP_STATE_COOKIE_WAIT:
+			case SCTP_STATE_COOKIE_ECHOED:
+				/*
+				 * INIT was sent but got a COOKIE_ECHO with the
+				 * correct tags... just accept it...but we must
+				 * process the init so that we can make sure we
+				 * have the right seq no's.
+				 */
+				/* First we must process the INIT !! */
+				if (sctp_process_init(init_cp, stcb) < 0) {
+					if (how_indx < sizeof(asoc->cookie_how))
+						asoc->cookie_how[how_indx] = 3;
+					op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+					SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
+					sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+					                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+					                       mflowtype, mflowid,
+#endif
+					                       vrf_id, net->port);
+					return (NULL);
+				}
+				/* we have already processed the INIT so no problem */
+				sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp,
+				                stcb, net,
+				                SCTP_FROM_SCTP_INPUT + SCTP_LOC_13);
+				sctp_timer_stop(SCTP_TIMER_TYPE_INIT, inp,
+				                stcb, net,
+				                SCTP_FROM_SCTP_INPUT + SCTP_LOC_14);
+				/* update current state */
+				if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
+					SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+				else
+					SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+
+				SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+				if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+					sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+					                 stcb->sctp_ep, stcb, NULL);
+				}
+				SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+				sctp_stop_all_cookie_timers(stcb);
+				if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+				     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+				    (!SCTP_IS_LISTENING(inp))) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+					struct socket *so;
+#endif
+					/*
+					 * Here is where collision would go if we
+					 * did a connect() and instead got a
+					 * init/init-ack/cookie done before the
+					 * init-ack came back..
+					 */
+					sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
+#if defined(__APPLE__) && !defined(__Userspace__)
+					so = SCTP_INP_SO(stcb->sctp_ep);
+					atomic_add_int(&stcb->asoc.refcnt, 1);
+					SCTP_TCB_UNLOCK(stcb);
+					SCTP_SOCKET_LOCK(so, 1);
+					SCTP_TCB_LOCK(stcb);
+					atomic_subtract_int(&stcb->asoc.refcnt, 1);
+					if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+						SCTP_TCB_UNLOCK(stcb);
+						SCTP_SOCKET_UNLOCK(so, 1);
+						return (NULL);
+					}
+#endif
+					soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) && !defined(__Userspace__)
+					SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+				}
+				/* notify upper layer */
+				*notification = SCTP_NOTIFY_ASSOC_UP;
+				/*
+				 * since we did not send a HB make sure we
+				 * don't double things
+				 */
+				old.tv_sec = cookie->time_entered.tv_sec;
+				old.tv_usec = cookie->time_entered.tv_usec;
+				net->hb_responded = 1;
+				sctp_calculate_rto(stcb, asoc, net, &old,
+				                   SCTP_RTT_FROM_NON_DATA);
+
+				if (stcb->asoc.sctp_autoclose_ticks &&
+				    (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE))) {
+					sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
+					                 inp, stcb, NULL);
+				}
+				break;
+			default:
+				/*
+				 * we're in the OPEN state (or beyond), so
+				 * peer must have simply lost the COOKIE-ACK
+				 */
+				break;
+		}	/* end switch */
+		sctp_stop_all_cookie_timers(stcb);
+		if ((retval = sctp_load_addresses_from_init(stcb, m,
+			                                    init_offset + sizeof(struct sctp_init_chunk),
+			                                    initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 4;
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             "Problem with address parameters");
+			SCTPDBG(SCTP_DEBUG_INPUT1,
+			        "Load addresses from INIT causes an abort %d\n",
+			        retval);
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+#endif
+			                       vrf_id, net->port);
+			return (NULL);
+		}
+		/* respond with a COOKIE-ACK */
+		sctp_toss_old_cookies(stcb, asoc);
+		sctp_send_cookie_ack(stcb);
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 5;
+		return (stcb);
+	}
+
+	if (ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
+	    ntohl(init_cp->init.initiate_tag) == asoc->peer_vtag &&
+	    cookie->tie_tag_my_vtag == 0 &&
+	    cookie->tie_tag_peer_vtag == 0) {
+		/*
+		 * case C in Section 5.2.4 Table 2: XMOO silently discard
+		 */
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 6;
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	/* If nat support, and the below and stcb is established,
+	 * send back a ABORT(colliding state) if we are established.
+	 */
+	if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) &&
+	    (asoc->peer_supports_nat) &&
+	    ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
+	     (asoc->peer_vtag == 0)))) {
+		/* Special case - Peer's support nat. We may have
+		 * two init's that we gave out the same tag on since
+		 * one was not established.. i.e. we get INIT from host-1
+		 * behind the nat and we respond tag-a, we get a INIT from
+		 * host-2 behind the nat and we get tag-a again. Then we
+		 * bring up host-1 (or 2's) assoc, Then comes the cookie
+		 * from hsot-2 (or 1). Now we have colliding state. We must
+		 * send an abort here with colliding state indication.
+		 */
+		op_err = sctp_generate_cause(SCTP_CAUSE_NAT_COLLIDING_STATE, "");
+		sctp_send_abort(m, iphlen,  src, dst, sh, 0, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                mflowtype, mflowid, inp->fibnum,
+#endif
+		                vrf_id, port);
+		SCTP_TCB_UNLOCK(stcb);
+		return (NULL);
+	}
+	if ((ntohl(initack_cp->init.initiate_tag) == asoc->my_vtag) &&
+	    ((ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) ||
+	     (asoc->peer_vtag == 0))) {
+		/*
+		 * case B in Section 5.2.4 Table 2: MXAA or MOAA my info
+		 * should be ok, re-accept peer info
+		 */
+		if (ntohl(initack_cp->init.initial_tsn) != asoc->init_seq_number) {
+			/* Extension of case C.
+			 * If we hit this, then the random number
+			 * generator returned the same vtag when we
+			 * first sent our INIT-ACK and when we later sent
+			 * our INIT. The side with the seq numbers that are
+			 * different will be the one that normally would
+			 * have hit case C. This in effect "extends" our vtags
+			 * in this collision case to be 64 bits. The same collision
+			 * could occur aka you get both vtag and seq number the
+			 * same twice in a row.. but is much less likely. If it
+			 * did happen then we would proceed through and bring
+			 * up the assoc.. we may end up with the wrong stream
+			 * setup however.. which would be bad.. but there is
+			 * no way to tell.. until we send on a stream that does
+			 * not exist :-)
+			 */
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 7;
+
+			SCTP_TCB_UNLOCK(stcb);
+			return (NULL);
+		}
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 8;
+		sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, inp, stcb, net,
+		                SCTP_FROM_SCTP_INPUT + SCTP_LOC_15);
+		sctp_stop_all_cookie_timers(stcb);
+		/*
+		 * since we did not send a HB make sure we don't double
+		 * things
+		 */
+		net->hb_responded = 1;
+		if (stcb->asoc.sctp_autoclose_ticks &&
+		    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb,
+			                 NULL);
+		}
+		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+		if (asoc->pre_open_streams < asoc->streamoutcnt) {
+			asoc->pre_open_streams = asoc->streamoutcnt;
+		}
+
+		if (ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) {
+			/* Ok the peer probably discarded our
+			 * data (if we echoed a cookie+data). So anything
+			 * on the sent_queue should be marked for
+			 * retransmit, we may not get something to
+			 * kick us so it COULD still take a timeout
+			 * to move these.. but it can't hurt to mark them.
+			 */
+
+			TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
+				if (chk->sent < SCTP_DATAGRAM_RESEND) {
+					chk->sent = SCTP_DATAGRAM_RESEND;
+					sctp_flight_size_decrease(chk);
+					sctp_total_flight_decrease(stcb, chk);
+					sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+					spec_flag++;
+				}
+			}
+		}
+		/* process the INIT info (peer's info) */
+		if (sctp_process_init(init_cp, stcb) < 0) {
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 9;
+			op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+#endif
+			                       vrf_id, net->port);
+			return (NULL);
+		}
+		if ((retval = sctp_load_addresses_from_init(stcb, m,
+		                                            init_offset + sizeof(struct sctp_init_chunk),
+		                                            initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 10;
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             "Problem with address parameters");
+			SCTPDBG(SCTP_DEBUG_INPUT1,
+			        "Load addresses from INIT causes an abort %d\n",
+			        retval);
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+#endif
+			                       vrf_id, net->port);
+			return (NULL);
+		}
+		if ((SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_WAIT) ||
+		    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+			*notification = SCTP_NOTIFY_ASSOC_UP;
+
+			if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+			     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+			    (!SCTP_IS_LISTENING(inp))) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+				struct socket *so;
+#endif
+				sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
+#if defined(__APPLE__) && !defined(__Userspace__)
+				so = SCTP_INP_SO(stcb->sctp_ep);
+				atomic_add_int(&stcb->asoc.refcnt, 1);
+				SCTP_TCB_UNLOCK(stcb);
+				SCTP_SOCKET_LOCK(so, 1);
+				SCTP_TCB_LOCK(stcb);
+				atomic_subtract_int(&stcb->asoc.refcnt, 1);
+				if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+					SCTP_TCB_UNLOCK(stcb);
+					SCTP_SOCKET_UNLOCK(so, 1);
+					return (NULL);
+				}
+#endif
+				soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) && !defined(__Userspace__)
+				SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+			}
+			if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)
+				SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+			else
+				SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+		} else if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
+			SCTP_STAT_INCR_COUNTER32(sctps_restartestab);
+		} else {
+			SCTP_STAT_INCR_COUNTER32(sctps_collisionestab);
+		}
+		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+			                 stcb->sctp_ep, stcb, NULL);
+		}
+		sctp_stop_all_cookie_timers(stcb);
+		sctp_toss_old_cookies(stcb, asoc);
+		sctp_send_cookie_ack(stcb);
+		if (spec_flag) {
+			/* only if we have retrans set do we do this. What
+			 * this call does is get only the COOKIE-ACK out
+			 * and then when we return the normal call to
+			 * sctp_chunk_output will get the retrans out
+			 * behind this.
+			 */
+			sctp_chunk_output(inp,stcb, SCTP_OUTPUT_FROM_COOKIE_ACK, SCTP_SO_NOT_LOCKED);
+		}
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 11;
+
+		return (stcb);
+	}
+	if ((ntohl(initack_cp->init.initiate_tag) != asoc->my_vtag &&
+	     ntohl(init_cp->init.initiate_tag) != asoc->peer_vtag) &&
+	    cookie->tie_tag_my_vtag == asoc->my_vtag_nonce &&
+	    cookie->tie_tag_peer_vtag == asoc->peer_vtag_nonce &&
+	    cookie->tie_tag_peer_vtag != 0) {
+		struct sctpasochead *head;
+#if defined(__APPLE__) && !defined(__Userspace__)
+		struct socket *so;
+#endif
+
+		if (asoc->peer_supports_nat) {
+			struct sctp_tcb *local_stcb;
+
+			/* This is a gross gross hack.
+			 * Just call the cookie_new code since we
+			 * are allowing a duplicate association.
+			 * I hope this works...
+			 */
+			local_stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst,
+			                                     sh, cookie, cookie_len,
+			                                     inp, netp, init_src,notification,
+			                                     auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                                     mflowtype, mflowid,
+#endif
+			                                     vrf_id, port);
+			if (local_stcb == NULL) {
+				SCTP_TCB_UNLOCK(stcb);
+			}
+			return (local_stcb);
+		}
+		/*
+		 * case A in Section 5.2.4 Table 2: XXMM (peer restarted)
+		 */
+		/* temp code */
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 12;
+		sctp_stop_association_timers(stcb, false);
+		/* notify upper layer */
+		*notification = SCTP_NOTIFY_ASSOC_RESTART;
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		if ((SCTP_GET_STATE(stcb) != SCTP_STATE_OPEN) &&
+		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_RECEIVED) &&
+		    (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT)) {
+			SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+		}
+		if (SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
+			SCTP_STAT_INCR_GAUGE32(sctps_restartestab);
+		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
+			SCTP_STAT_INCR_GAUGE32(sctps_collisionestab);
+		}
+		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+			                 stcb->sctp_ep, stcb, NULL);
+
+		} else if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_SENT) {
+			/* move to OPEN state, if not in SHUTDOWN_SENT */
+			SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+		}
+		if (asoc->pre_open_streams < asoc->streamoutcnt) {
+			asoc->pre_open_streams = asoc->streamoutcnt;
+		}
+		asoc->init_seq_number = ntohl(initack_cp->init.initial_tsn);
+		asoc->sending_seq = asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number;
+		asoc->asconf_seq_out_acked = asoc->asconf_seq_out - 1;
+		asoc->asconf_seq_in = asoc->last_acked_seq = asoc->init_seq_number - 1;
+		asoc->str_reset_seq_in = asoc->init_seq_number;
+		asoc->advanced_peer_ack_point = asoc->last_acked_seq;
+		asoc->send_sack = 1;
+		asoc->data_pkts_seen = 0;
+		asoc->last_data_chunk_from = NULL;
+		asoc->last_control_chunk_from = NULL;
+		asoc->last_net_cmt_send_started = NULL;
+		if (asoc->mapping_array) {
+			memset(asoc->mapping_array, 0,
+			       asoc->mapping_array_size);
+		}
+		if (asoc->nr_mapping_array) {
+			memset(asoc->nr_mapping_array, 0,
+			    asoc->mapping_array_size);
+		}
+		SCTP_TCB_UNLOCK(stcb);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		so = SCTP_INP_SO(stcb->sctp_ep);
+		SCTP_SOCKET_LOCK(so, 1);
+#endif
+		SCTP_INP_INFO_WLOCK();
+		SCTP_INP_WLOCK(stcb->sctp_ep);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+		/* send up all the data */
+		sctp_report_all_outbound(stcb, 0, SCTP_SO_LOCKED);
+		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+			stcb->asoc.strmout[i].chunks_on_queues = 0;
+#if defined(SCTP_DETAILED_STR_STATS)
+			for (j = 0; j < SCTP_PR_SCTP_MAX + 1; j++) {
+				asoc->strmout[i].abandoned_sent[j] = 0;
+				asoc->strmout[i].abandoned_unsent[j] = 0;
+			}
+#else
+			asoc->strmout[i].abandoned_sent[0] = 0;
+			asoc->strmout[i].abandoned_unsent[0] = 0;
+#endif
+			stcb->asoc.strmout[i].next_mid_ordered = 0;
+			stcb->asoc.strmout[i].next_mid_unordered = 0;
+			stcb->asoc.strmout[i].sid = i;
+			stcb->asoc.strmout[i].last_msg_incomplete = 0;
+		}
+		TAILQ_FOREACH_SAFE(strrst, &asoc->resetHead, next_resp, nstrrst) {
+			TAILQ_REMOVE(&asoc->resetHead, strrst, next_resp);
+			SCTP_FREE(strrst, SCTP_M_STRESET);
+		}
+		TAILQ_FOREACH_SAFE(sq, &asoc->pending_reply_queue, next, nsq) {
+			TAILQ_REMOVE(&asoc->pending_reply_queue, sq, next);
+			if (sq->data) {
+				sctp_m_freem(sq->data);
+				sq->data = NULL;
+			}
+			sctp_free_remote_addr(sq->whoFrom);
+			sq->whoFrom = NULL;
+			sq->stcb = NULL;
+			sctp_free_a_readq(stcb, sq);
+		}
+		TAILQ_FOREACH_SAFE(chk, &asoc->control_send_queue, sctp_next, nchk) {
+			TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			if (chk->holds_key_ref)
+				sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
+			sctp_free_remote_addr(chk->whoTo);
+			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
+			SCTP_DECR_CHK_COUNT();
+		}
+		asoc->ctrl_queue_cnt = 0;
+		asoc->str_reset = NULL;
+		asoc->stream_reset_outstanding = 0;
+		TAILQ_FOREACH_SAFE(chk, &asoc->asconf_send_queue, sctp_next, nchk) {
+			TAILQ_REMOVE(&asoc->asconf_send_queue, chk, sctp_next);
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			if (chk->holds_key_ref)
+				sctp_auth_key_release(stcb, chk->auth_keyid, SCTP_SO_LOCKED);
+			sctp_free_remote_addr(chk->whoTo);
+			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), chk);
+			SCTP_DECR_CHK_COUNT();
+		}
+		TAILQ_FOREACH_SAFE(aparam, &asoc->asconf_queue, next, naparam) {
+			TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
+			SCTP_FREE(aparam,SCTP_M_ASC_ADDR);
+		}
+		TAILQ_FOREACH_SAFE(aack, &asoc->asconf_ack_sent, next, naack) {
+			TAILQ_REMOVE(&asoc->asconf_ack_sent, aack, next);
+			if (aack->data != NULL) {
+				sctp_m_freem(aack->data);
+			}
+			SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), aack);
+		}
+
+		/* process the INIT-ACK info (my info) */
+		asoc->my_vtag = ntohl(initack_cp->init.initiate_tag);
+		asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+
+		/* pull from vtag hash */
+		LIST_REMOVE(stcb, sctp_asocs);
+		/* re-insert to new vtag position */
+		head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
+		                                                        SCTP_BASE_INFO(hashasocmark))];
+		/*
+		 * put it in the bucket in the vtag hash of assoc's for the
+		 * system
+		 */
+		LIST_INSERT_HEAD(head, stcb, sctp_asocs);
+
+		SCTP_INP_WUNLOCK(stcb->sctp_ep);
+		SCTP_INP_INFO_WUNLOCK();
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		asoc->total_flight = 0;
+		asoc->total_flight_count = 0;
+		/* process the INIT info (peer's info) */
+		if (sctp_process_init(init_cp, stcb) < 0) {
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 13;
+			op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+			SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_init() failed\n");
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+#endif
+			                       vrf_id, net->port);
+			return (NULL);
+		}
+		/*
+		 * since we did not send a HB make sure we don't double
+		 * things
+		 */
+		net->hb_responded = 1;
+
+		if ((retval = sctp_load_addresses_from_init(stcb, m,
+		                                            init_offset + sizeof(struct sctp_init_chunk),
+		                                            initack_offset, src, dst, init_src, stcb->asoc.port)) < 0) {
+			if (how_indx < sizeof(asoc->cookie_how))
+				asoc->cookie_how[how_indx] = 14;
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             "Problem with address parameters");
+			SCTPDBG(SCTP_DEBUG_INPUT1,
+			        "Load addresses from INIT causes an abort %d\n",
+			        retval);
+			sctp_abort_association(stcb->sctp_ep, stcb, m, iphlen,
+			                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                       mflowtype, mflowid,
+#endif
+			                       vrf_id, net->port);
+			return (NULL);
+		}
+		/* respond with a COOKIE-ACK */
+		sctp_send_cookie_ack(stcb);
+		if (how_indx < sizeof(asoc->cookie_how))
+			asoc->cookie_how[how_indx] = 15;
+		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE) &&
+		    (asoc->sctp_autoclose_ticks > 0)) {
+			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
+		}
+		return (stcb);
+	}
+	if (how_indx < sizeof(asoc->cookie_how))
+		asoc->cookie_how[how_indx] = 16;
+	/* all other cases... */
+	SCTP_TCB_UNLOCK(stcb);
+	return (NULL);
+}
+
+/*
+ * handle a state cookie for a new association m: input packet mbuf chain--
+ * assumes a pullup on IP/SCTP/COOKIE-ECHO chunk note: this is a "split" mbuf
+ * and the cookie signature does not exist offset: offset into mbuf to the
+ * cookie-echo chunk length: length of the cookie chunk to: where the init
+ * was from returns a new TCB
+ */
+static struct sctp_tcb *
+sctp_process_cookie_new(struct mbuf *m, int iphlen, int offset,
+    struct sockaddr *src, struct sockaddr *dst,
+    struct sctphdr *sh, struct sctp_state_cookie *cookie, int cookie_len,
+    struct sctp_inpcb *inp, struct sctp_nets **netp,
+    struct sockaddr *init_src, int *notification,
+    int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+    uint8_t mflowtype, uint32_t mflowid,
+#endif
+    uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_tcb *stcb;
+	struct sctp_init_chunk *init_cp, init_buf;
+	struct sctp_init_ack_chunk *initack_cp, initack_buf;
+	union sctp_sockstore store;
+	struct sctp_association *asoc;
+	int init_offset, initack_offset, initack_limit;
+	int error = 0;
+	uint8_t auth_chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+
+	so = SCTP_INP_SO(inp);
+#endif
+
+	/*
+	 * find and validate the INIT chunk in the cookie (peer's info) the
+	 * INIT should start after the cookie-echo header struct (chunk
+	 * header, state cookie header struct)
+	 */
+	init_offset = offset + sizeof(struct sctp_cookie_echo_chunk);
+	init_cp = (struct sctp_init_chunk *)
+	    sctp_m_getptr(m, init_offset, sizeof(struct sctp_init_chunk),
+	    (uint8_t *) & init_buf);
+	if (init_cp == NULL) {
+		/* could not pull a INIT chunk in cookie */
+		SCTPDBG(SCTP_DEBUG_INPUT1,
+			"process_cookie_new: could not pull INIT chunk hdr\n");
+		return (NULL);
+	}
+	if (init_cp->ch.chunk_type != SCTP_INITIATION) {
+		SCTPDBG(SCTP_DEBUG_INPUT1, "HUH? process_cookie_new: could not find INIT chunk!\n");
+		return (NULL);
+	}
+	initack_offset = init_offset + SCTP_SIZE32(ntohs(init_cp->ch.chunk_length));
+	/*
+	 * find and validate the INIT-ACK chunk in the cookie (my info) the
+	 * INIT-ACK follows the INIT chunk
+	 */
+	initack_cp = (struct sctp_init_ack_chunk *)
+	    sctp_m_getptr(m, initack_offset, sizeof(struct sctp_init_ack_chunk),
+	    (uint8_t *) & initack_buf);
+	if (initack_cp == NULL) {
+		/* could not pull INIT-ACK chunk in cookie */
+		SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: could not pull INIT-ACK chunk hdr\n");
+		return (NULL);
+	}
+	if (initack_cp->ch.chunk_type != SCTP_INITIATION_ACK) {
+		return (NULL);
+	}
+	/*
+	 * NOTE: We can't use the INIT_ACK's chk_length to determine the
+	 * "initack_limit" value.  This is because the chk_length field
+	 * includes the length of the cookie, but the cookie is omitted when
+	 * the INIT and INIT_ACK are tacked onto the cookie...
+	 */
+	initack_limit = offset + cookie_len;
+
+	/*
+	 * now that we know the INIT/INIT-ACK are in place, create a new TCB
+	 * and populate
+	 */
+
+	/*
+	 * Here we do a trick, we set in NULL for the proc/thread argument. We
+	 * do this since in effect we only use the p argument when
+	 * the socket is unbound and we must do an implicit bind.
+	 * Since we are getting a cookie, we cannot be unbound.
+	 */
+	stcb = sctp_aloc_assoc(inp, init_src, &error,
+	                       ntohl(initack_cp->init.initiate_tag),
+	                       ntohl(initack_cp->init.initial_tsn), vrf_id,
+	                       ntohs(initack_cp->init.num_outbound_streams),
+	                       port,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	                       (struct thread *)NULL,
+#elif defined(_WIN32) && !defined(__Userspace__)
+	                       (PKTHREAD)NULL,
+#else
+	                       (struct proc *)NULL,
+#endif
+	                       SCTP_DONT_INITIALIZE_AUTH_PARAMS);
+	if (stcb == NULL) {
+		struct mbuf *op_err;
+
+		/* memory problem? */
+		SCTPDBG(SCTP_DEBUG_INPUT1,
+			"process_cookie_new: no room for another TCB!\n");
+		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
+		                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, port);
+		return (NULL);
+	}
+	asoc = &stcb->asoc;
+	/* get scope variables out of cookie */
+	asoc->scope.ipv4_local_scope = cookie->ipv4_scope;
+	asoc->scope.site_scope = cookie->site_scope;
+	asoc->scope.local_scope = cookie->local_scope;
+	asoc->scope.loopback_scope = cookie->loopback_scope;
+
+#if defined(__Userspace__)
+	if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
+	    (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal) ||
+	    (asoc->scope.conn_addr_legal != cookie->conn_addr_legal)) {
+#else
+	if ((asoc->scope.ipv4_addr_legal != cookie->ipv4_addr_legal) ||
+	    (asoc->scope.ipv6_addr_legal != cookie->ipv6_addr_legal)) {
+#endif
+		struct mbuf *op_err;
+
+		/*
+		 * Houston we have a problem. The EP changed while the
+		 * cookie was in flight. Only recourse is to abort the
+		 * association.
+		 */
+		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+		sctp_abort_association(inp, (struct sctp_tcb *)NULL, m, iphlen,
+				       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                       mflowtype, mflowid,
+#endif
+		                       vrf_id, port);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+				      SCTP_FROM_SCTP_INPUT + SCTP_LOC_18);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		return (NULL);
+	}
+	/* process the INIT-ACK info (my info) */
+	asoc->my_rwnd = ntohl(initack_cp->init.a_rwnd);
+
+	/* process the INIT info (peer's info) */
+	if (sctp_process_init(init_cp, stcb) < 0) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+		                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_19);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		return (NULL);
+	}
+	/* load all addresses */
+	if (sctp_load_addresses_from_init(stcb, m,
+	                                  init_offset + sizeof(struct sctp_init_chunk),
+	                                  initack_offset, src, dst, init_src, port) < 0) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+		                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_20);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		return (NULL);
+	}
+	/*
+	 * verify any preceding AUTH chunk that was skipped
+	 */
+	/* pull the local authentication parameters from the cookie/init-ack */
+	sctp_auth_get_cookie_params(stcb, m,
+	    initack_offset + sizeof(struct sctp_init_ack_chunk),
+	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)));
+	if (auth_skipped) {
+		struct sctp_auth_chunk *auth;
+
+		if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
+			auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, auth_chunk_buf);
+		} else {
+			auth = NULL;
+		}
+		if ((auth == NULL) || sctp_handle_auth(stcb, auth, m, auth_offset)) {
+			/* auth HMAC failed, dump the assoc and packet */
+			SCTPDBG(SCTP_DEBUG_AUTH1,
+				"COOKIE-ECHO: AUTH failed\n");
+#if defined(__APPLE__) && !defined(__Userspace__)
+			atomic_add_int(&stcb->asoc.refcnt, 1);
+			SCTP_TCB_UNLOCK(stcb);
+			SCTP_SOCKET_LOCK(so, 1);
+			SCTP_TCB_LOCK(stcb);
+			atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+			(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+			                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_21);
+#if defined(__APPLE__) && !defined(__Userspace__)
+			SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+			return (NULL);
+		} else {
+			/* remaining chunks checked... good to go */
+			stcb->asoc.authenticated = 1;
+		}
+	}
+
+	/*
+	 * if we're doing ASCONFs, check to see if we have any new local
+	 * addresses that need to get added to the peer (eg. addresses
+	 * changed while cookie echo in flight).  This needs to be done
+	 * after we go to the OPEN state to do the correct asconf
+	 * processing. else, make sure we have the correct addresses in our
+	 * lists
+	 */
+
+	/* warning, we re-use sin, sin6, sa_store here! */
+	/* pull in local_address (our "from" address) */
+	switch (cookie->laddr_type) {
+#ifdef INET
+	case SCTP_IPV4_ADDRESS:
+		/* source addr is IPv4 */
+		memset(&store.sin, 0, sizeof(struct sockaddr_in));
+		store.sin.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+		store.sin.sin_len = sizeof(struct sockaddr_in);
+#endif
+		store.sin.sin_addr.s_addr = cookie->laddress[0];
+		break;
+#endif
+#ifdef INET6
+	case SCTP_IPV6_ADDRESS:
+		/* source addr is IPv6 */
+		memset(&store.sin6, 0, sizeof(struct sockaddr_in6));
+		store.sin6.sin6_family = AF_INET6;
+#ifdef HAVE_SIN6_LEN
+		store.sin6.sin6_len = sizeof(struct sockaddr_in6);
+#endif
+		store.sin6.sin6_scope_id = cookie->scope_id;
+		memcpy(&store.sin6.sin6_addr, cookie->laddress, sizeof(struct in6_addr));
+		break;
+#endif
+#if defined(__Userspace__)
+	case SCTP_CONN_ADDRESS:
+		/* source addr is conn */
+		memset(&store.sconn, 0, sizeof(struct sockaddr_conn));
+		store.sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+		store.sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+		memcpy(&store.sconn.sconn_addr, cookie->laddress, sizeof(void *));
+		break;
+#endif
+	default:
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+		(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+		                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_22);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		return (NULL);
+	}
+
+	/* update current state */
+	SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
+	SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+	if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+		sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+		                 stcb->sctp_ep, stcb, NULL);
+	}
+	sctp_stop_all_cookie_timers(stcb);
+	SCTP_STAT_INCR_COUNTER32(sctps_passiveestab);
+	SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+
+	/* set up to notify upper layer */
+	*notification = SCTP_NOTIFY_ASSOC_UP;
+	if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+	    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
+	    (!SCTP_IS_LISTENING(inp))) {
+		/*
+		 * This is an endpoint that called connect() how it got a
+		 * cookie that is NEW is a bit of a mystery. It must be that
+		 * the INIT was sent, but before it got there.. a complete
+		 * INIT/INIT-ACK/COOKIE arrived. But of course then it
+		 * should have went to the other code.. not here.. oh well..
+		 * a bit of protection is worth having..
+		 *
+		 * XXXMJ unlocked
+		 */
+		sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(stcb);
+		SCTP_SOCKET_LOCK(so, 1);
+		SCTP_TCB_LOCK(stcb);
+		atomic_subtract_int(&stcb->asoc.refcnt, 1);
+		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+			SCTP_SOCKET_UNLOCK(so, 1);
+			return (NULL);
+		}
+#endif
+		soisconnected(stcb->sctp_socket);
+#if defined(__APPLE__) && !defined(__Userspace__)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	} else if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
+	           (SCTP_IS_LISTENING(inp))) {
+		/*
+		 * We don't want to do anything with this one. Since it is
+		 * the listening guy. The timer will get started for
+		 * accepted connections in the caller.
+		 */
+		;
+	}
+	if (stcb->asoc.sctp_autoclose_ticks &&
+	    sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+		sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE, inp, stcb, NULL);
+	}
+	(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_entered);
+	*netp = sctp_findnet(stcb, init_src);
+	if (*netp != NULL) {
+		struct timeval old;
+
+		/*
+		 * Since we did not send a HB, make sure we don't double
+		 * things.
+		 */
+		(*netp)->hb_responded = 1;
+		/* Calculate the RTT. */
+		old.tv_sec = cookie->time_entered.tv_sec;
+		old.tv_usec = cookie->time_entered.tv_usec;
+		sctp_calculate_rto(stcb, asoc, *netp, &old, SCTP_RTT_FROM_NON_DATA);
+	}
+	/* respond with a COOKIE-ACK */
+	sctp_send_cookie_ack(stcb);
+
+	/*
+	 * check the address lists for any ASCONFs that need to be sent
+	 * AFTER the cookie-ack is sent
+	 */
+	sctp_check_address_list(stcb, m,
+	    initack_offset + sizeof(struct sctp_init_ack_chunk),
+	    initack_limit - (initack_offset + sizeof(struct sctp_init_ack_chunk)),
+	    &store.sa, cookie->local_scope, cookie->site_scope,
+	    cookie->ipv4_scope, cookie->loopback_scope);
+
+	return (stcb);
+}
+
+/*
+ * CODE LIKE THIS NEEDS TO RUN IF the peer supports the NAT extension, i.e
+ * we NEED to make sure we are not already using the vtag. If so we
+ * need to send back an ABORT-TRY-AGAIN-WITH-NEW-TAG No middle box bit!
+	head = &SCTP_BASE_INFO(sctp_asochash)[SCTP_PCBHASH_ASOC(tag,
+							    SCTP_BASE_INFO(hashasocmark))];
+	LIST_FOREACH(stcb, head, sctp_asocs) {
+	        if ((stcb->asoc.my_vtag == tag) && (stcb->rport == rport) && (inp == stcb->sctp_ep)) {
+		       -- SEND ABORT - TRY AGAIN --
+		}
+	}
+*/
+
+/*
+ * handles a COOKIE-ECHO message stcb: modified to either a new or left as
+ * existing (non-NULL) TCB
+ */
+static struct mbuf *
+sctp_handle_cookie_echo(struct mbuf *m, int iphlen, int offset,
+    struct sockaddr *src, struct sockaddr *dst,
+    struct sctphdr *sh, struct sctp_cookie_echo_chunk *cp,
+    struct sctp_inpcb **inp_p, struct sctp_tcb **stcb, struct sctp_nets **netp,
+    int auth_skipped, uint32_t auth_offset, uint32_t auth_len,
+    struct sctp_tcb **locked_tcb,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+    uint8_t mflowtype, uint32_t mflowid,
+#endif
+    uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_state_cookie *cookie;
+	struct sctp_tcb *l_stcb = *stcb;
+	struct sctp_inpcb *l_inp;
+	struct sockaddr *to;
+	struct sctp_pcb *ep;
+	struct mbuf *m_sig;
+	uint8_t calc_sig[SCTP_SIGNATURE_SIZE], tmp_sig[SCTP_SIGNATURE_SIZE];
+	uint8_t *sig;
+#if defined(__Userspace__) && defined(FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION)
+	uint8_t cookie_ok = 1;
+#else
+	uint8_t cookie_ok = 0;
+#endif
+	unsigned int sig_offset, cookie_offset;
+	unsigned int cookie_len;
+	struct timeval now;
+	struct timeval time_entered, time_expires;
+	int notification = 0;
+	struct sctp_nets *netl;
+	int had_a_existing_tcb = 0;
+	int send_int_conf = 0;
+#ifdef INET
+	struct sockaddr_in sin;
+#endif
+#ifdef INET6
+	struct sockaddr_in6 sin6;
+#endif
+#if defined(__Userspace__)
+	struct sockaddr_conn sconn;
+#endif
+
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_cookie: handling COOKIE-ECHO\n");
+
+	if (inp_p == NULL) {
+		return (NULL);
+	}
+	cookie = &cp->cookie;
+	cookie_offset = offset + sizeof(struct sctp_chunkhdr);
+	cookie_len = ntohs(cp->ch.chunk_length);
+
+	if (cookie_len < sizeof(struct sctp_cookie_echo_chunk) +
+	    sizeof(struct sctp_init_chunk) +
+	    sizeof(struct sctp_init_ack_chunk) + SCTP_SIGNATURE_SIZE) {
+		/* cookie too small */
+		return (NULL);
+	}
+	if ((cookie->peerport != sh->src_port) ||
+	    (cookie->myport != sh->dest_port) ||
+	    (cookie->my_vtag != sh->v_tag)) {
+		/*
+		 * invalid ports or bad tag.  Note that we always leave the
+		 * v_tag in the header in network order and when we stored
+		 * it in the my_vtag slot we also left it in network order.
+		 * This maintains the match even though it may be in the
+		 * opposite byte order of the machine :->
+		 */
+		return (NULL);
+	}
+#if defined(__Userspace__)
+	/*
+	 * Recover the AF_CONN addresses within the cookie.
+	 * This needs to be done in the buffer provided for later processing
+	 * of the cookie and in the mbuf chain for HMAC validation.
+	 */
+	if ((cookie->addr_type == SCTP_CONN_ADDRESS) && (src->sa_family == AF_CONN)) {
+		struct sockaddr_conn *sconnp = (struct sockaddr_conn *)src;
+
+		memcpy(cookie->address, &sconnp->sconn_addr , sizeof(void *));
+		m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, address),
+		           (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
+	}
+	if ((cookie->laddr_type == SCTP_CONN_ADDRESS) && (dst->sa_family == AF_CONN)) {
+		struct sockaddr_conn *sconnp = (struct sockaddr_conn *)dst;
+
+		memcpy(cookie->laddress, &sconnp->sconn_addr , sizeof(void *));
+		m_copyback(m, cookie_offset + offsetof(struct sctp_state_cookie, laddress),
+		           (int)sizeof(void *), (caddr_t)&sconnp->sconn_addr);
+	}
+#endif
+	/*
+	 * split off the signature into its own mbuf (since it should not be
+	 * calculated in the sctp_hmac_m() call).
+	 */
+	sig_offset = offset + cookie_len - SCTP_SIGNATURE_SIZE;
+	m_sig = m_split(m, sig_offset, M_NOWAIT);
+	if (m_sig == NULL) {
+		/* out of memory or ?? */
+		return (NULL);
+	}
+#ifdef SCTP_MBUF_LOGGING
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+		sctp_log_mbc(m_sig, SCTP_MBUF_SPLIT);
+	}
+#endif
+
+	/*
+	 * compute the signature/digest for the cookie
+	 */
+	if (l_stcb != NULL) {
+		atomic_add_int(&l_stcb->asoc.refcnt, 1);
+		SCTP_TCB_UNLOCK(l_stcb);
+	}
+	l_inp = *inp_p;
+	SCTP_INP_RLOCK(l_inp);
+	if (l_stcb != NULL) {
+		SCTP_TCB_LOCK(l_stcb);
+		atomic_subtract_int(&l_stcb->asoc.refcnt, 1);
+	}
+	if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE | SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
+		SCTP_INP_RUNLOCK(l_inp);
+		sctp_m_freem(m_sig);
+		return (NULL);
+	}
+	ep = &(*inp_p)->sctp_ep;
+	/* which cookie is it? */
+	if ((cookie->time_entered.tv_sec < (long)ep->time_of_secret_change) &&
+	    (ep->current_secret_number != ep->last_secret_number)) {
+		/* it's the old cookie */
+		(void)sctp_hmac_m(SCTP_HMAC,
+		    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
+		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+	} else {
+		/* it's the current cookie */
+		(void)sctp_hmac_m(SCTP_HMAC,
+		    (uint8_t *)ep->secret_key[(int)ep->current_secret_number],
+		    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+	}
+	/* get the signature */
+	SCTP_INP_RUNLOCK(l_inp);
+	sig = (uint8_t *) sctp_m_getptr(m_sig, 0, SCTP_SIGNATURE_SIZE, (uint8_t *) & tmp_sig);
+	if (sig == NULL) {
+		/* couldn't find signature */
+		sctp_m_freem(m_sig);
+		return (NULL);
+	}
+	/* compare the received digest with the computed digest */
+	if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) != 0) {
+		/* try the old cookie? */
+		if ((cookie->time_entered.tv_sec == (long)ep->time_of_secret_change) &&
+		    (ep->current_secret_number != ep->last_secret_number)) {
+			/* compute digest with old */
+			(void)sctp_hmac_m(SCTP_HMAC,
+			    (uint8_t *)ep->secret_key[(int)ep->last_secret_number],
+			    SCTP_SECRET_SIZE, m, cookie_offset, calc_sig, 0);
+			/* compare */
+			if (timingsafe_bcmp(calc_sig, sig, SCTP_SIGNATURE_SIZE) == 0)
+				cookie_ok = 1;
+		}
+	} else {
+		cookie_ok = 1;
+	}
+
+	/*
+	 * Now before we continue we must reconstruct our mbuf so that
+	 * normal processing of any other chunks will work.
+	 */
+	{
+		struct mbuf *m_at;
+
+		m_at = m;
+		while (SCTP_BUF_NEXT(m_at) != NULL) {
+			m_at = SCTP_BUF_NEXT(m_at);
+		}
+		SCTP_BUF_NEXT(m_at) = m_sig;
+	}
+
+	if (cookie_ok == 0) {
+		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie signature validation failed!\n");
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"offset = %u, cookie_offset = %u, sig_offset = %u\n",
+			(uint32_t) offset, cookie_offset, sig_offset);
+		return (NULL);
+	}
+
+	if (sctp_ticks_to_msecs(cookie->cookie_life) > SCTP_MAX_COOKIE_LIFE) {
+		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid cookie lifetime\n");
+		return (NULL);
+	}
+	time_entered.tv_sec = cookie->time_entered.tv_sec;
+	time_entered.tv_usec = cookie->time_entered.tv_usec;
+	if ((time_entered.tv_sec < 0) ||
+	    (time_entered.tv_usec < 0) ||
+	    (time_entered.tv_usec >= 1000000)) {
+		/* Invalid time stamp. Cookie must have been modified. */
+		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: Invalid time stamp\n");
+		return (NULL);
+	}
+	(void)SCTP_GETTIME_TIMEVAL(&now);
+#if !(defined(__FreeBSD__) && !defined(__Userspace__))
+	if (timercmp(&now, &time_entered, <)) {
+#else
+	if (timevalcmp(&now, &time_entered, <)) {
+#endif
+		SCTPDBG(SCTP_DEBUG_INPUT2, "handle_cookie_echo: cookie generated in the future!\n");
+		return (NULL);
+	}
+	/*
+	 * Check the cookie timestamps to be sure it's not stale.
+	 * cookie_life is in ticks, so we convert to seconds.
+	 */
+	time_expires.tv_sec = time_entered.tv_sec + sctp_ticks_to_secs(cookie->cookie_life);
+	time_expires.tv_usec = time_entered.tv_usec;
+#if !(defined(__FreeBSD__) && !defined(__Userspace__))
+	if (timercmp(&now, &time_expires, >))
+#else
+	if (timevalcmp(&now, &time_expires, >))
+#endif
+	{
+		/* cookie is stale! */
+		struct mbuf *op_err;
+		struct sctp_error_stale_cookie *cause;
+		struct timeval diff;
+		uint32_t staleness;
+
+		op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_error_stale_cookie),
+		                               0, M_NOWAIT, 1, MT_DATA);
+		if (op_err == NULL) {
+			/* FOOBAR */
+			return (NULL);
+		}
+		/* Set the len */
+		SCTP_BUF_LEN(op_err) = sizeof(struct sctp_error_stale_cookie);
+		cause = mtod(op_err, struct sctp_error_stale_cookie *);
+		cause->cause.code = htons(SCTP_CAUSE_STALE_COOKIE);
+		cause->cause.length = htons(sizeof(struct sctp_error_stale_cookie));
+#if !(defined(__FreeBSD__) && !defined(__Userspace__))
+		timersub(&now, &time_expires, &diff);
+#else
+		diff = now;
+		timevalsub(&diff, &time_expires);
+#endif
+		if ((uint32_t)diff.tv_sec > UINT32_MAX / 1000000) {
+			staleness = UINT32_MAX;
+		} else {
+			staleness = (uint32_t)diff.tv_sec * 1000000;
+		}
+		if (UINT32_MAX - staleness >= (uint32_t)diff.tv_usec) {
+			staleness += (uint32_t)diff.tv_usec;
+		} else {
+			staleness = UINT32_MAX;
+		}
+		cause->stale_time = htonl(staleness);
+		sctp_send_operr_to(src, dst, sh, cookie->peers_vtag, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                   mflowtype, mflowid, l_inp->fibnum,
+#endif
+		                   vrf_id, port);
+		return (NULL);
+	}
+	/*
+	 * Now we must see with the lookup address if we have an existing
+	 * asoc. This will only happen if we were in the COOKIE-WAIT state
+	 * and a INIT collided with us and somewhere the peer sent the
+	 * cookie on another address besides the single address our assoc
+	 * had for him. In this case we will have one of the tie-tags set at
+	 * least AND the address field in the cookie can be used to look it
+	 * up.
+	 */
+	to = NULL;
+	switch (cookie->addr_type) {
+#ifdef INET6
+	case SCTP_IPV6_ADDRESS:
+		memset(&sin6, 0, sizeof(sin6));
+		sin6.sin6_family = AF_INET6;
+#ifdef HAVE_SIN6_LEN
+		sin6.sin6_len = sizeof(sin6);
+#endif
+		sin6.sin6_port = sh->src_port;
+		sin6.sin6_scope_id = cookie->scope_id;
+		memcpy(&sin6.sin6_addr.s6_addr, cookie->address,
+		    sizeof(sin6.sin6_addr.s6_addr));
+		to = (struct sockaddr *)&sin6;
+		break;
+#endif
+#ifdef INET
+	case SCTP_IPV4_ADDRESS:
+		memset(&sin, 0, sizeof(sin));
+		sin.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+		sin.sin_len = sizeof(sin);
+#endif
+		sin.sin_port = sh->src_port;
+		sin.sin_addr.s_addr = cookie->address[0];
+		to = (struct sockaddr *)&sin;
+		break;
+#endif
+#if defined(__Userspace__)
+	case SCTP_CONN_ADDRESS:
+		memset(&sconn, 0, sizeof(struct sockaddr_conn));
+		sconn.sconn_family = AF_CONN;
+#ifdef HAVE_SCONN_LEN
+		sconn.sconn_len = sizeof(struct sockaddr_conn);
+#endif
+		sconn.sconn_port = sh->src_port;
+		memcpy(&sconn.sconn_addr, cookie->address, sizeof(void *));
+		to = (struct sockaddr *)&sconn;
+		break;
+#endif
+	default:
+		/* This should not happen */
+		return (NULL);
+	}
+	if (*stcb == NULL) {
+		/* Yep, lets check */
+		*stcb = sctp_findassociation_ep_addr(inp_p, to, netp, dst, NULL);
+		if (*stcb == NULL) {
+			/*
+			 * We should have only got back the same inp. If we
+			 * got back a different ep we have a problem. The
+			 * original findep got back l_inp and now
+			 */
+			if (l_inp != *inp_p) {
+				SCTP_PRINTF("Bad problem find_ep got a diff inp then special_locate?\n");
+			}
+		} else {
+			if (*locked_tcb == NULL) {
+				/* In this case we found the assoc only
+				 * after we locked the create lock. This means
+				 * we are in a colliding case and we must make
+				 * sure that we unlock the tcb if its one of the
+				 * cases where we throw away the incoming packets.
+				 */
+				*locked_tcb = *stcb;
+
+				/* We must also increment the inp ref count
+				 * since the ref_count flags was set when we
+				 * did not find the TCB, now we found it which
+				 * reduces the refcount.. we must raise it back
+				 * out to balance it all :-)
+				 */
+				SCTP_INP_INCR_REF((*stcb)->sctp_ep);
+				if ((*stcb)->sctp_ep != l_inp) {
+					SCTP_PRINTF("Huh? ep:%p diff then l_inp:%p?\n",
+						    (void *)(*stcb)->sctp_ep, (void *)l_inp);
+				}
+			}
+		}
+	}
+
+	cookie_len -= SCTP_SIGNATURE_SIZE;
+	if (*stcb == NULL) {
+		/* this is the "normal" case... get a new TCB */
+		*stcb = sctp_process_cookie_new(m, iphlen, offset, src, dst, sh,
+		                                cookie, cookie_len, *inp_p,
+		                                netp, to, &notification,
+		                                auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                                mflowtype, mflowid,
+#endif
+		                                vrf_id, port);
+	} else {
+		/* this is abnormal... cookie-echo on existing TCB */
+		had_a_existing_tcb = 1;
+		*stcb = sctp_process_cookie_existing(m, iphlen, offset,
+		                                     src, dst, sh,
+		                                     cookie, cookie_len, *inp_p, *stcb, netp, to,
+		                                     &notification, auth_skipped, auth_offset, auth_len,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                                     mflowtype, mflowid,
+#endif
+		                                     vrf_id, port);
+		if (*stcb == NULL) {
+			*locked_tcb = NULL;
+		}
+	}
+
+	if (*stcb == NULL) {
+		/* still no TCB... must be bad cookie-echo */
+		return (NULL);
+	}
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	if (*netp != NULL) {
+		(*netp)->flowtype = mflowtype;
+		(*netp)->flowid = mflowid;
+	}
+#endif
+	/*
+	 * Ok, we built an association so confirm the address we sent the
+	 * INIT-ACK to.
+	 */
+	netl = sctp_findnet(*stcb, to);
+	/*
+	 * This code should in theory NOT run but
+	 */
+	if (netl == NULL) {
+		/* TSNH! Huh, why do I need to add this address here? */
+		if (sctp_add_remote_addr(*stcb, to, NULL, port,
+		                         SCTP_DONOT_SETSCOPE, SCTP_IN_COOKIE_PROC)) {
+			return (NULL);
+		}
+		netl = sctp_findnet(*stcb, to);
+	}
+	if (netl) {
+		if (netl->dest_state & SCTP_ADDR_UNCONFIRMED) {
+			netl->dest_state &= ~SCTP_ADDR_UNCONFIRMED;
+			(void)sctp_set_primary_addr((*stcb), (struct sockaddr *)NULL,
+			    netl);
+			send_int_conf = 1;
+		}
+	}
+	sctp_start_net_timers(*stcb);
+	if ((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
+		if (!had_a_existing_tcb ||
+		    (((*inp_p)->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)) {
+			/*
+			 * If we have a NEW cookie or the connect never
+			 * reached the connected state during collision we
+			 * must do the TCP accept thing.
+			 */
+			struct socket *so, *oso;
+			struct sctp_inpcb *inp;
+
+			if (notification == SCTP_NOTIFY_ASSOC_RESTART) {
+				/*
+				 * For a restart we will keep the same
+				 * socket, no need to do anything. I THINK!!
+				 */
+				sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+				if (send_int_conf) {
+					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+					                (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+				}
+				return (m);
+			}
+			oso = (*inp_p)->sctp_socket;
+			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+			SCTP_TCB_UNLOCK((*stcb));
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			CURVNET_SET(oso->so_vnet);
+#endif
+#if defined(__APPLE__) && !defined(__Userspace__)
+			SCTP_SOCKET_LOCK(oso, 1);
+#endif
+			so = sonewconn(oso, 0
+#if defined(__APPLE__) && !defined(__Userspace__)
+			    ,NULL
+#endif
+			    );
+#if defined(__APPLE__) && !defined(__Userspace__)
+			SCTP_SOCKET_UNLOCK(oso, 1);
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			CURVNET_RESTORE();
+#endif
+			SCTP_TCB_LOCK((*stcb));
+			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+
+			if (so == NULL) {
+				struct mbuf *op_err;
+#if defined(__APPLE__) && !defined(__Userspace__)
+				struct socket *pcb_so;
+#endif
+				/* Too many sockets */
+				SCTPDBG(SCTP_DEBUG_INPUT1, "process_cookie_new: no room for another socket!\n");
+				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+				sctp_abort_association(*inp_p, NULL, m, iphlen,
+						       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+				                       mflowtype, mflowid,
+#endif
+				                       vrf_id, port);
+#if defined(__APPLE__) && !defined(__Userspace__)
+				pcb_so = SCTP_INP_SO(*inp_p);
+				atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+				SCTP_TCB_UNLOCK((*stcb));
+				SCTP_SOCKET_LOCK(pcb_so, 1);
+				SCTP_TCB_LOCK((*stcb));
+				atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+#endif
+				(void)sctp_free_assoc(*inp_p, *stcb, SCTP_NORMAL_PROC,
+				                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_23);
+#if defined(__APPLE__) && !defined(__Userspace__)
+				SCTP_SOCKET_UNLOCK(pcb_so, 1);
+#endif
+				return (NULL);
+			}
+			inp = (struct sctp_inpcb *)so->so_pcb;
+			SCTP_INP_INCR_REF(inp);
+			/*
+			 * We add the unbound flag here so that
+			 * if we get an soabort() before we get the
+			 * move_pcb done, we will properly cleanup.
+			 */
+			inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
+			    SCTP_PCB_FLAGS_CONNECTED |
+			    SCTP_PCB_FLAGS_IN_TCPPOOL |
+			    SCTP_PCB_FLAGS_UNBOUND |
+			    (SCTP_PCB_COPY_FLAGS & (*inp_p)->sctp_flags) |
+			    SCTP_PCB_FLAGS_DONT_WAKE);
+			inp->sctp_features = (*inp_p)->sctp_features;
+			inp->sctp_mobility_features = (*inp_p)->sctp_mobility_features;
+			inp->sctp_socket = so;
+			inp->sctp_frag_point = (*inp_p)->sctp_frag_point;
+			inp->max_cwnd = (*inp_p)->max_cwnd;
+			inp->sctp_cmt_on_off = (*inp_p)->sctp_cmt_on_off;
+			inp->ecn_supported = (*inp_p)->ecn_supported;
+			inp->prsctp_supported = (*inp_p)->prsctp_supported;
+			inp->auth_supported = (*inp_p)->auth_supported;
+			inp->asconf_supported = (*inp_p)->asconf_supported;
+			inp->reconfig_supported = (*inp_p)->reconfig_supported;
+			inp->nrsack_supported = (*inp_p)->nrsack_supported;
+			inp->pktdrop_supported = (*inp_p)->pktdrop_supported;
+			inp->partial_delivery_point = (*inp_p)->partial_delivery_point;
+			inp->sctp_context = (*inp_p)->sctp_context;
+			inp->local_strreset_support = (*inp_p)->local_strreset_support;
+			inp->fibnum = (*inp_p)->fibnum;
+#if defined(__Userspace__)
+			inp->ulp_info = (*inp_p)->ulp_info;
+			inp->recv_callback = (*inp_p)->recv_callback;
+			inp->send_callback = (*inp_p)->send_callback;
+			inp->send_sb_threshold = (*inp_p)->send_sb_threshold;
+#endif
+			/*
+			 * copy in the authentication parameters from the
+			 * original endpoint
+			 */
+			if (inp->sctp_ep.local_hmacs)
+				sctp_free_hmaclist(inp->sctp_ep.local_hmacs);
+			inp->sctp_ep.local_hmacs =
+			    sctp_copy_hmaclist((*inp_p)->sctp_ep.local_hmacs);
+			if (inp->sctp_ep.local_auth_chunks)
+				sctp_free_chunklist(inp->sctp_ep.local_auth_chunks);
+			inp->sctp_ep.local_auth_chunks =
+			    sctp_copy_chunklist((*inp_p)->sctp_ep.local_auth_chunks);
+
+			/*
+			 * Now we must move it from one hash table to
+			 * another and get the tcb in the right place.
+			 */
+
+			/* This is where the one-2-one socket is put into
+			 * the accept state waiting for the accept!
+			 */
+			if (*stcb) {
+				SCTP_ADD_SUBSTATE(*stcb, SCTP_STATE_IN_ACCEPT_QUEUE);
+			}
+			sctp_move_pcb_and_assoc(*inp_p, inp, *stcb);
+
+			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+			SCTP_TCB_UNLOCK((*stcb));
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb,
+			    0);
+#else
+			sctp_pull_off_control_to_new_inp((*inp_p), inp, *stcb, M_NOWAIT);
+#endif
+			SCTP_TCB_LOCK((*stcb));
+			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+
+			/* now we must check to see if we were aborted while
+			 * the move was going on and the lock/unlock happened.
+			 */
+			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+				/* yep it was, we leave the
+				 * assoc attached to the socket since
+				 * the sctp_inpcb_free() call will send
+				 * an abort for us.
+				 */
+				SCTP_INP_DECR_REF(inp);
+				return (NULL);
+			}
+			SCTP_INP_DECR_REF(inp);
+			/* Switch over to the new guy */
+			*inp_p = inp;
+			sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+			if (send_int_conf) {
+				sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+				                (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+			}
+
+			/* Pull it from the incomplete queue and wake the guy */
+#if defined(__APPLE__) && !defined(__Userspace__)
+			atomic_add_int(&(*stcb)->asoc.refcnt, 1);
+			SCTP_TCB_UNLOCK((*stcb));
+			SCTP_SOCKET_LOCK(so, 1);
+#endif
+			soisconnected(so);
+#if defined(__APPLE__) && !defined(__Userspace__)
+			SCTP_TCB_LOCK((*stcb));
+			atomic_subtract_int(&(*stcb)->asoc.refcnt, 1);
+			SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+			return (m);
+		}
+	}
+	if (notification) {
+		sctp_ulp_notify(notification, *stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+	}
+	if (send_int_conf) {
+		sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_CONFIRMED,
+		                (*stcb), 0, (void *)netl, SCTP_SO_NOT_LOCKED);
+	}
+	return (m);
+}
+
+static void
+sctp_handle_cookie_ack(struct sctp_cookie_ack_chunk *cp SCTP_UNUSED,
+    struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+	/* cp must not be used, others call this without a c-ack :-) */
+	struct sctp_association *asoc;
+	struct sctp_tmit_chunk *chk;
+
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_cookie_ack: handling COOKIE-ACK\n");
+	if ((stcb == NULL) || (net == NULL)) {
+		return;
+	}
+
+	asoc = &stcb->asoc;
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+		sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+			       asoc->overall_error_count,
+			       0,
+			       SCTP_FROM_SCTP_INPUT,
+			       __LINE__);
+	}
+	asoc->overall_error_count = 0;
+	sctp_stop_all_cookie_timers(stcb);
+	/* process according to association state */
+	if (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED) {
+		/* state change only needed when I am in right state */
+		SCTPDBG(SCTP_DEBUG_INPUT2, "moving to OPEN state\n");
+		SCTP_SET_STATE(stcb, SCTP_STATE_OPEN);
+		sctp_start_net_timers(stcb);
+		if (asoc->state & SCTP_STATE_SHUTDOWN_PENDING) {
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+			                 stcb->sctp_ep, stcb, NULL);
+		}
+		/* update RTO */
+		SCTP_STAT_INCR_COUNTER32(sctps_activeestab);
+		SCTP_STAT_INCR_GAUGE32(sctps_currestab);
+		if (asoc->overall_error_count == 0) {
+			sctp_calculate_rto(stcb, asoc, net, &asoc->time_entered,
+			                   SCTP_RTT_FROM_NON_DATA);
+		}
+		(void)SCTP_GETTIME_TIMEVAL(&asoc->time_entered);
+		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_UP, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+		if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
+		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+			struct socket *so;
+
+#endif
+			sctp_pcb_add_flags(stcb->sctp_ep, SCTP_PCB_FLAGS_CONNECTED);
+#if defined(__APPLE__) && !defined(__Userspace__)
+			so = SCTP_INP_SO(stcb->sctp_ep);
+			atomic_add_int(&stcb->asoc.refcnt, 1);
+			SCTP_TCB_UNLOCK(stcb);
+			SCTP_SOCKET_LOCK(so, 1);
+			SCTP_TCB_LOCK(stcb);
+			atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+			if ((stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) == 0) {
+				soisconnected(stcb->sctp_socket);
+			}
+#if defined(__APPLE__) && !defined(__Userspace__)
+			SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		}
+		/*
+		 * since we did not send a HB make sure we don't double
+		 * things
+		 */
+		net->hb_responded = 1;
+
+		if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
+			/* We don't need to do the asconf thing,
+			 * nor hb or autoclose if the socket is closed.
+			 */
+			goto closed_socket;
+		}
+
+		sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
+		    stcb, net);
+
+		if (stcb->asoc.sctp_autoclose_ticks &&
+		    sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_AUTOCLOSE)) {
+			sctp_timer_start(SCTP_TIMER_TYPE_AUTOCLOSE,
+			    stcb->sctp_ep, stcb, NULL);
+		}
+		/*
+		 * send ASCONF if parameters are pending and ASCONFs are
+		 * allowed (eg. addresses changed when init/cookie echo were
+		 * in flight)
+		 */
+		if ((sctp_is_feature_on(stcb->sctp_ep, SCTP_PCB_FLAGS_DO_ASCONF)) &&
+		    (stcb->asoc.asconf_supported == 1) &&
+		    (!TAILQ_EMPTY(&stcb->asoc.asconf_queue))) {
+#ifdef SCTP_TIMER_BASED_ASCONF
+			sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
+					 stcb->sctp_ep, stcb,
+					 stcb->asoc.primary_destination);
+#else
+			sctp_send_asconf(stcb, stcb->asoc.primary_destination,
+					 SCTP_ADDR_NOT_LOCKED);
+#endif
+		}
+	}
+closed_socket:
+	/* Toss the cookie if I can */
+	sctp_toss_old_cookies(stcb, asoc);
+	/* Restart the timer if we have pending data */
+	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
+		if (chk->whoTo != NULL) {
+			break;
+		}
+	}
+	if (chk != NULL) {
+		sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
+	}
+}
+
+static void
+sctp_handle_ecn_echo(struct sctp_ecne_chunk *cp,
+		     struct sctp_tcb *stcb)
+{
+	struct sctp_nets *net;
+	struct sctp_tmit_chunk *lchk;
+	struct sctp_ecne_chunk bkup;
+	uint8_t override_bit;
+	uint32_t tsn, window_data_tsn;
+	int len;
+	unsigned int pkt_cnt;
+
+	len = ntohs(cp->ch.chunk_length);
+	if (len == sizeof(struct old_sctp_ecne_chunk)) {
+		/* Its the old format */
+		memcpy(&bkup, cp, sizeof(struct old_sctp_ecne_chunk));
+		bkup.num_pkts_since_cwr = htonl(1);
+		cp = &bkup;
+	}
+	SCTP_STAT_INCR(sctps_recvecne);
+	tsn = ntohl(cp->tsn);
+	pkt_cnt = ntohl(cp->num_pkts_since_cwr);
+	lchk = TAILQ_LAST(&stcb->asoc.send_queue, sctpchunk_listhead);
+	if (lchk == NULL) {
+		window_data_tsn = stcb->asoc.sending_seq - 1;
+	} else {
+		window_data_tsn = lchk->rec.data.tsn;
+	}
+
+	/* Find where it was sent to if possible. */
+	net = NULL;
+	TAILQ_FOREACH(lchk, &stcb->asoc.sent_queue, sctp_next) {
+		if (lchk->rec.data.tsn == tsn) {
+			net = lchk->whoTo;
+			net->ecn_prev_cwnd = lchk->rec.data.cwnd_at_send;
+			break;
+		}
+		if (SCTP_TSN_GT(lchk->rec.data.tsn, tsn)) {
+			break;
+		}
+	}
+	if (net == NULL) {
+		/*
+		 * What to do. A previous send of a
+		 * CWR was possibly lost. See how old it is, we
+		 * may have it marked on the actual net.
+		 */
+		TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
+			if (tsn == net->last_cwr_tsn) {
+				/* Found him, send it off */
+				break;
+			}
+		}
+		if (net == NULL) {
+			/*
+			 * If we reach here, we need to send a special
+			 * CWR that says hey, we did this a long time
+			 * ago and you lost the response.
+			 */
+			net = TAILQ_FIRST(&stcb->asoc.nets);
+			if (net == NULL) {
+				/* TSNH */
+				return;
+			}
+			override_bit = SCTP_CWR_REDUCE_OVERRIDE;
+		} else {
+			override_bit = 0;
+		}
+	} else {
+		override_bit = 0;
+	}
+	if (SCTP_TSN_GT(tsn, net->cwr_window_tsn) &&
+	    ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
+		/* JRS - Use the congestion control given in the pluggable CC module */
+		stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 0, pkt_cnt);
+		/*
+		 * We reduce once every RTT. So we will only lower cwnd at
+		 * the next sending seq i.e. the window_data_tsn
+		 */
+		net->cwr_window_tsn = window_data_tsn;
+		net->ecn_ce_pkt_cnt += pkt_cnt;
+		net->lost_cnt = pkt_cnt;
+		net->last_cwr_tsn = tsn;
+	} else {
+		override_bit |= SCTP_CWR_IN_SAME_WINDOW;
+		if (SCTP_TSN_GT(tsn, net->last_cwr_tsn) &&
+		    ((override_bit&SCTP_CWR_REDUCE_OVERRIDE) == 0)) {
+			/*
+			 * Another loss in the same window update how
+			 * many marks/packets lost we have had.
+			 */
+			int cnt = 1;
+			if (pkt_cnt > net->lost_cnt) {
+				/* Should be the case */
+				cnt = (pkt_cnt - net->lost_cnt);
+				net->ecn_ce_pkt_cnt += cnt;
+			}
+			net->lost_cnt = pkt_cnt;
+			net->last_cwr_tsn = tsn;
+			/*
+			 * Most CC functions will ignore this call, since we are in-window
+			 * yet of the initial CE the peer saw.
+			 */
+			stcb->asoc.cc_functions.sctp_cwnd_update_after_ecn_echo(stcb, net, 1, cnt);
+		}
+	}
+	/*
+	 * We always send a CWR this way if our previous one was lost our
+	 * peer will get an update, or if it is not time again to reduce we
+	 * still get the cwr to the peer. Note we set the override when we
+	 * could not find the TSN on the chunk or the destination network.
+	 */
+	sctp_send_cwr(stcb, net, net->last_cwr_tsn, override_bit);
+}
+
+static void
+sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+	/*
+	 * Here we get a CWR from the peer. We must look in the outqueue and
+	 * make sure that we have a covered ECNE in the control chunk part.
+	 * If so remove it.
+	 */
+	struct sctp_tmit_chunk *chk, *nchk;
+	struct sctp_ecne_chunk *ecne;
+	int override;
+	uint32_t cwr_tsn;
+
+	cwr_tsn = ntohl(cp->tsn);
+	override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
+	TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, nchk) {
+		if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
+			continue;
+		}
+		if ((override == 0) && (chk->whoTo != net)) {
+			/* Must be from the right src unless override is set */
+			continue;
+		}
+		ecne = mtod(chk->data, struct sctp_ecne_chunk *);
+		if (SCTP_TSN_GE(cwr_tsn, ntohl(ecne->tsn))) {
+			/* this covers this ECNE, we can remove it */
+			stcb->asoc.ecn_echo_cnt_onq--;
+			TAILQ_REMOVE(&stcb->asoc.control_send_queue, chk,
+			    sctp_next);
+			stcb->asoc.ctrl_queue_cnt--;
+			sctp_m_freem(chk->data);
+			chk->data = NULL;
+			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+			if (override == 0) {
+				break;
+			}
+		}
+	}
+}
+
+static void
+sctp_handle_shutdown_complete(struct sctp_shutdown_complete_chunk *cp SCTP_UNUSED,
+    struct sctp_tcb *stcb, struct sctp_nets *net)
+{
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+#endif
+
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_shutdown_complete: handling SHUTDOWN-COMPLETE\n");
+	if (stcb == NULL)
+		return;
+
+	/* process according to association state */
+	if (SCTP_GET_STATE(stcb) != SCTP_STATE_SHUTDOWN_ACK_SENT) {
+		/* unexpected SHUTDOWN-COMPLETE... so ignore... */
+		SCTPDBG(SCTP_DEBUG_INPUT2,
+			"sctp_handle_shutdown_complete: not in SCTP_STATE_SHUTDOWN_ACK_SENT --- ignore\n");
+		SCTP_TCB_UNLOCK(stcb);
+		return;
+	}
+	/* notify upper layer protocol */
+	if (stcb->sctp_socket) {
+		sctp_ulp_notify(SCTP_NOTIFY_ASSOC_DOWN, stcb, 0, NULL, SCTP_SO_NOT_LOCKED);
+	}
+#ifdef INVARIANTS
+	if (!TAILQ_EMPTY(&stcb->asoc.send_queue) ||
+	    !TAILQ_EMPTY(&stcb->asoc.sent_queue) ||
+	    sctp_is_there_unsent_data(stcb, SCTP_SO_NOT_LOCKED)) {
+		panic("Queues are not empty when handling SHUTDOWN-COMPLETE");
+	}
+#endif
+	/* stop the timer */
+	sctp_timer_stop(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, net,
+	                SCTP_FROM_SCTP_INPUT + SCTP_LOC_24);
+	SCTP_STAT_INCR_COUNTER32(sctps_shutdown);
+	/* free the TCB */
+	SCTPDBG(SCTP_DEBUG_INPUT2,
+		"sctp_handle_shutdown_complete: calls free-asoc\n");
+#if defined(__APPLE__) && !defined(__Userspace__)
+	so = SCTP_INP_SO(stcb->sctp_ep);
+	atomic_add_int(&stcb->asoc.refcnt, 1);
+	SCTP_TCB_UNLOCK(stcb);
+	SCTP_SOCKET_LOCK(so, 1);
+	SCTP_TCB_LOCK(stcb);
+	atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+	(void)sctp_free_assoc(stcb->sctp_ep, stcb, SCTP_NORMAL_PROC,
+	                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_25);
+#if defined(__APPLE__) && !defined(__Userspace__)
+	SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	return;
+}
+
+static int
+process_chunk_drop(struct sctp_tcb *stcb, struct sctp_chunk_desc *desc,
+    struct sctp_nets *net, uint8_t flg)
+{
+	switch (desc->chunk_type) {
+	case SCTP_DATA:
+	case SCTP_IDATA:
+		/* find the tsn to resend (possibly) */
+	{
+		uint32_t tsn;
+		struct sctp_tmit_chunk *tp1;
+
+		tsn = ntohl(desc->tsn_ifany);
+		TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+			if (tp1->rec.data.tsn == tsn) {
+				/* found it */
+				break;
+			}
+			if (SCTP_TSN_GT(tp1->rec.data.tsn, tsn)) {
+				/* not found */
+				tp1 = NULL;
+				break;
+			}
+		}
+		if (tp1 == NULL) {
+			/*
+			 * Do it the other way , aka without paying
+			 * attention to queue seq order.
+			 */
+			SCTP_STAT_INCR(sctps_pdrpdnfnd);
+			TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+				if (tp1->rec.data.tsn == tsn) {
+					/* found it */
+					break;
+				}
+			}
+		}
+		if (tp1 == NULL) {
+			SCTP_STAT_INCR(sctps_pdrptsnnf);
+		}
+		if ((tp1) && (tp1->sent < SCTP_DATAGRAM_ACKED)) {
+			if (((flg & SCTP_BADCRC) == 0) &&
+			    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
+				return (0);
+			}
+			if ((stcb->asoc.peers_rwnd == 0) &&
+			    ((flg & SCTP_FROM_MIDDLE_BOX) == 0)) {
+				SCTP_STAT_INCR(sctps_pdrpdiwnp);
+				return (0);
+			}
+			if (stcb->asoc.peers_rwnd == 0 &&
+			    (flg & SCTP_FROM_MIDDLE_BOX)) {
+				SCTP_STAT_INCR(sctps_pdrpdizrw);
+				return (0);
+			}
+			if ((uint32_t)SCTP_BUF_LEN(tp1->data) <
+			    SCTP_DATA_CHUNK_OVERHEAD(stcb) + SCTP_NUM_DB_TO_VERIFY) {
+				/* Payload not matching. */
+				SCTP_STAT_INCR(sctps_pdrpbadd);
+				return (-1);
+			}
+			if (memcmp(mtod(tp1->data, caddr_t) + SCTP_DATA_CHUNK_OVERHEAD(stcb),
+			           desc->data_bytes, SCTP_NUM_DB_TO_VERIFY) != 0) {
+				/* Payload not matching. */
+				SCTP_STAT_INCR(sctps_pdrpbadd);
+				return (-1);
+			}
+			if (tp1->do_rtt) {
+				/*
+				 * this guy had a RTO calculation
+				 * pending on it, cancel it
+				 */
+				if (tp1->whoTo->rto_needed == 0) {
+					tp1->whoTo->rto_needed = 1;
+				}
+				tp1->do_rtt = 0;
+			}
+			SCTP_STAT_INCR(sctps_pdrpmark);
+			if (tp1->sent != SCTP_DATAGRAM_RESEND)
+				sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+			/*
+			 * mark it as if we were doing a FR, since
+			 * we will be getting gap ack reports behind
+			 * the info from the router.
+			 */
+			tp1->rec.data.doing_fast_retransmit = 1;
+			/*
+			 * mark the tsn with what sequences can
+			 * cause a new FR.
+			 */
+			if (TAILQ_EMPTY(&stcb->asoc.send_queue)) {
+				tp1->rec.data.fast_retran_tsn = stcb->asoc.sending_seq;
+			} else {
+				tp1->rec.data.fast_retran_tsn = (TAILQ_FIRST(&stcb->asoc.send_queue))->rec.data.tsn;
+			}
+
+			/* restart the timer */
+			sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+					stcb, tp1->whoTo,
+			                SCTP_FROM_SCTP_INPUT + SCTP_LOC_26);
+			sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+					 stcb, tp1->whoTo);
+
+			/* fix counts and things */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+				sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_PDRP,
+					       tp1->whoTo->flight_size,
+					       tp1->book_size,
+					       (uint32_t)(uintptr_t)stcb,
+					       tp1->rec.data.tsn);
+			}
+			if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+				sctp_flight_size_decrease(tp1);
+				sctp_total_flight_decrease(stcb, tp1);
+			}
+			tp1->sent = SCTP_DATAGRAM_RESEND;
+		} {
+			/* audit code */
+			unsigned int audit;
+
+			audit = 0;
+			TAILQ_FOREACH(tp1, &stcb->asoc.sent_queue, sctp_next) {
+				if (tp1->sent == SCTP_DATAGRAM_RESEND)
+					audit++;
+			}
+			TAILQ_FOREACH(tp1, &stcb->asoc.control_send_queue,
+				      sctp_next) {
+				if (tp1->sent == SCTP_DATAGRAM_RESEND)
+					audit++;
+			}
+			if (audit != stcb->asoc.sent_queue_retran_cnt) {
+				SCTP_PRINTF("**Local Audit finds cnt:%d asoc cnt:%d\n",
+					    audit, stcb->asoc.sent_queue_retran_cnt);
+#ifndef SCTP_AUDITING_ENABLED
+				stcb->asoc.sent_queue_retran_cnt = audit;
+#endif
+			}
+		}
+	}
+	break;
+	case SCTP_ASCONF:
+	{
+		struct sctp_tmit_chunk *asconf;
+
+		TAILQ_FOREACH(asconf, &stcb->asoc.control_send_queue,
+			      sctp_next) {
+			if (asconf->rec.chunk_id.id == SCTP_ASCONF) {
+				break;
+			}
+		}
+		if (asconf) {
+			if (asconf->sent != SCTP_DATAGRAM_RESEND)
+				sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+			asconf->sent = SCTP_DATAGRAM_RESEND;
+			asconf->snd_count--;
+		}
+	}
+	break;
+	case SCTP_INITIATION:
+		/* resend the INIT */
+		stcb->asoc.dropped_special_cnt++;
+		if (stcb->asoc.dropped_special_cnt < SCTP_RETRY_DROPPED_THRESH) {
+			/*
+			 * If we can get it in, in a few attempts we do
+			 * this, otherwise we let the timer fire.
+			 */
+			sctp_timer_stop(SCTP_TIMER_TYPE_INIT, stcb->sctp_ep,
+					stcb, net,
+			                SCTP_FROM_SCTP_INPUT + SCTP_LOC_27);
+			sctp_send_initiate(stcb->sctp_ep, stcb, SCTP_SO_NOT_LOCKED);
+		}
+		break;
+	case SCTP_SELECTIVE_ACK:
+	case SCTP_NR_SELECTIVE_ACK:
+		/* resend the sack */
+		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
+		break;
+	case SCTP_HEARTBEAT_REQUEST:
+		/* resend a demand HB */
+		if ((stcb->asoc.overall_error_count + 3) < stcb->asoc.max_send_times) {
+			/* Only retransmit if we KNOW we wont destroy the tcb */
+			sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
+		}
+		break;
+	case SCTP_SHUTDOWN:
+		sctp_send_shutdown(stcb, net);
+		break;
+	case SCTP_SHUTDOWN_ACK:
+		sctp_send_shutdown_ack(stcb, net);
+		break;
+	case SCTP_COOKIE_ECHO:
+	{
+		struct sctp_tmit_chunk *cookie;
+
+		cookie = NULL;
+		TAILQ_FOREACH(cookie, &stcb->asoc.control_send_queue,
+			      sctp_next) {
+			if (cookie->rec.chunk_id.id == SCTP_COOKIE_ECHO) {
+				break;
+			}
+		}
+		if (cookie) {
+			if (cookie->sent != SCTP_DATAGRAM_RESEND)
+				sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+			cookie->sent = SCTP_DATAGRAM_RESEND;
+			sctp_stop_all_cookie_timers(stcb);
+		}
+	}
+	break;
+	case SCTP_COOKIE_ACK:
+		sctp_send_cookie_ack(stcb);
+		break;
+	case SCTP_ASCONF_ACK:
+		/* resend last asconf ack */
+		sctp_send_asconf_ack(stcb);
+		break;
+	case SCTP_IFORWARD_CUM_TSN:
+	case SCTP_FORWARD_CUM_TSN:
+		send_forward_tsn(stcb, &stcb->asoc);
+		break;
+		/* can't do anything with these */
+	case SCTP_PACKET_DROPPED:
+	case SCTP_INITIATION_ACK:	/* this should not happen */
+	case SCTP_HEARTBEAT_ACK:
+	case SCTP_ABORT_ASSOCIATION:
+	case SCTP_OPERATION_ERROR:
+	case SCTP_SHUTDOWN_COMPLETE:
+	case SCTP_ECN_ECHO:
+	case SCTP_ECN_CWR:
+	default:
+		break;
+	}
+	return (0);
+}
+
+void
+sctp_reset_in_stream(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+	uint32_t i;
+	uint16_t temp;
+
+	/*
+	 * We set things to 0xffffffff since this is the last delivered sequence
+	 * and we will be sending in 0 after the reset.
+	 */
+
+	if (number_entries) {
+		for (i = 0; i < number_entries; i++) {
+			temp = ntohs(list[i]);
+			if (temp >= stcb->asoc.streamincnt) {
+				continue;
+			}
+			stcb->asoc.strmin[temp].last_mid_delivered = 0xffffffff;
+		}
+	} else {
+		list = NULL;
+		for (i = 0; i < stcb->asoc.streamincnt; i++) {
+			stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
+		}
+	}
+	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_RECV, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
+}
+
+static void
+sctp_reset_out_streams(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+	uint32_t i;
+	uint16_t temp;
+
+	if (number_entries > 0) {
+		for (i = 0; i < number_entries; i++) {
+			temp = ntohs(list[i]);
+			if (temp >= stcb->asoc.streamoutcnt) {
+				/* no such stream */
+				continue;
+			}
+			stcb->asoc.strmout[temp].next_mid_ordered = 0;
+			stcb->asoc.strmout[temp].next_mid_unordered = 0;
+		}
+	} else {
+		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+			stcb->asoc.strmout[i].next_mid_ordered = 0;
+			stcb->asoc.strmout[i].next_mid_unordered = 0;
+		}
+	}
+	sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_SEND, stcb, number_entries, (void *)list, SCTP_SO_NOT_LOCKED);
+}
+
+static void
+sctp_reset_clear_pending(struct sctp_tcb *stcb, uint32_t number_entries, uint16_t *list)
+{
+	uint32_t i;
+	uint16_t temp;
+
+	if (number_entries > 0) {
+		for (i = 0; i < number_entries; i++) {
+			temp = ntohs(list[i]);
+			if (temp >= stcb->asoc.streamoutcnt) {
+				/* no such stream */
+				continue;
+			}
+			stcb->asoc.strmout[temp].state = SCTP_STREAM_OPEN;
+		}
+	} else {
+		for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+			stcb->asoc.strmout[i].state = SCTP_STREAM_OPEN;
+		}
+	}
+}
+
+struct sctp_stream_reset_request *
+sctp_find_stream_reset(struct sctp_tcb *stcb, uint32_t seq, struct sctp_tmit_chunk **bchk)
+{
+	struct sctp_association *asoc;
+	struct sctp_chunkhdr *ch;
+	struct sctp_stream_reset_request *r;
+	struct sctp_tmit_chunk *chk;
+	int len, clen;
+
+	asoc = &stcb->asoc;
+	chk = asoc->str_reset;
+	if (TAILQ_EMPTY(&asoc->control_send_queue) ||
+	    (chk == NULL)) {
+		asoc->stream_reset_outstanding = 0;
+		return (NULL);
+	}
+	if (chk->data == NULL) {
+		return (NULL);
+	}
+	if (bchk != NULL) {
+		/* he wants a copy of the chk pointer */
+		*bchk = chk;
+	}
+	clen = chk->send_size;
+	ch = mtod(chk->data, struct sctp_chunkhdr *);
+	r = (struct sctp_stream_reset_request *)(ch + 1);
+	if (ntohl(r->request_seq) == seq) {
+		/* found it */
+		return (r);
+	}
+	len = SCTP_SIZE32(ntohs(r->ph.param_length));
+	if (clen > (len + (int)sizeof(struct sctp_chunkhdr))) {
+		/* move to the next one, there can only be a max of two */
+		r = (struct sctp_stream_reset_request *)((caddr_t)r + len);
+		if (ntohl(r->request_seq) == seq) {
+			return (r);
+		}
+	}
+	/* that seq is not here */
+	return (NULL);
+}
+
+static void
+sctp_clean_up_stream_reset(struct sctp_tcb *stcb)
+{
+	struct sctp_association *asoc;
+	struct sctp_tmit_chunk *chk;
+
+	asoc = &stcb->asoc;
+	chk = asoc->str_reset;
+	if (chk == NULL) {
+		return;
+	}
+	asoc->str_reset = NULL;
+	sctp_timer_stop(SCTP_TIMER_TYPE_STRRESET, stcb->sctp_ep, stcb,
+	                NULL, SCTP_FROM_SCTP_INPUT + SCTP_LOC_28);
+	TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
+	asoc->ctrl_queue_cnt--;
+	if (chk->data) {
+		sctp_m_freem(chk->data);
+		chk->data = NULL;
+	}
+	sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+}
+
+static int
+sctp_handle_stream_reset_response(struct sctp_tcb *stcb,
+				  uint32_t seq, uint32_t action,
+				  struct sctp_stream_reset_response *respin)
+{
+	uint16_t type;
+	int lparam_len;
+	struct sctp_association *asoc = &stcb->asoc;
+	struct sctp_tmit_chunk *chk;
+	struct sctp_stream_reset_request *req_param;
+	struct sctp_stream_reset_out_request *req_out_param;
+	struct sctp_stream_reset_in_request *req_in_param;
+	uint32_t number_entries;
+
+	if (asoc->stream_reset_outstanding == 0) {
+		/* duplicate */
+		return (0);
+	}
+	if (seq == stcb->asoc.str_reset_seq_out) {
+		req_param = sctp_find_stream_reset(stcb, seq, &chk);
+		if (req_param != NULL) {
+			stcb->asoc.str_reset_seq_out++;
+			type = ntohs(req_param->ph.param_type);
+			lparam_len = ntohs(req_param->ph.param_length);
+			if (type == SCTP_STR_RESET_OUT_REQUEST) {
+				int no_clear = 0;
+
+				req_out_param = (struct sctp_stream_reset_out_request *)req_param;
+				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t);
+				asoc->stream_reset_out_is_outstanding = 0;
+				if (asoc->stream_reset_outstanding)
+					asoc->stream_reset_outstanding--;
+				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+					/* do it */
+					sctp_reset_out_streams(stcb, number_entries, req_out_param->list_of_streams);
+				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+				} else if (action == SCTP_STREAM_RESET_RESULT_IN_PROGRESS) {
+					/* Set it up so we don't stop retransmitting */
+					asoc->stream_reset_outstanding++;
+					stcb->asoc.str_reset_seq_out--;
+					asoc->stream_reset_out_is_outstanding = 1;
+					no_clear = 1;
+				} else {
+					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_OUT, stcb, number_entries, req_out_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+				}
+				if (no_clear == 0) {
+					sctp_reset_clear_pending(stcb, number_entries, req_out_param->list_of_streams);
+				}
+			} else if (type == SCTP_STR_RESET_IN_REQUEST) {
+				req_in_param = (struct sctp_stream_reset_in_request *)req_param;
+				number_entries = (lparam_len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t);
+				if (asoc->stream_reset_outstanding)
+					asoc->stream_reset_outstanding--;
+				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_DENIED_IN, stcb,
+							number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
+					sctp_ulp_notify(SCTP_NOTIFY_STR_RESET_FAILED_IN, stcb,
+							number_entries, req_in_param->list_of_streams, SCTP_SO_NOT_LOCKED);
+				}
+			} else if (type == SCTP_STR_RESET_ADD_OUT_STREAMS) {
+				/* Ok we now may have more streams */
+				int num_stream;
+
+				num_stream = stcb->asoc.strm_pending_add_size;
+				if (num_stream > (stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt)) {
+					/* TSNH */
+					num_stream = stcb->asoc.strm_realoutsize - stcb->asoc.streamoutcnt;
+				}
+				stcb->asoc.strm_pending_add_size = 0;
+				if (asoc->stream_reset_outstanding)
+					asoc->stream_reset_outstanding--;
+				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+					/* Put the new streams into effect */
+					int i;
+					for (i = asoc->streamoutcnt; i < (asoc->streamoutcnt + num_stream); i++) {
+						asoc->strmout[i].state = SCTP_STREAM_OPEN;
+					}
+					asoc->streamoutcnt += num_stream;
+					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
+				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+								     SCTP_STREAM_CHANGE_DENIED);
+				} else {
+					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+								     SCTP_STREAM_CHANGE_FAILED);
+				}
+			} else if (type == SCTP_STR_RESET_ADD_IN_STREAMS) {
+				if (asoc->stream_reset_outstanding)
+					asoc->stream_reset_outstanding--;
+				if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+								     SCTP_STREAM_CHANGE_DENIED);
+				} else if (action != SCTP_STREAM_RESET_RESULT_PERFORMED) {
+					sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt,
+								     SCTP_STREAM_CHANGE_FAILED);
+				}
+			} else if (type == SCTP_STR_RESET_TSN_REQUEST) {
+				/**
+				 * a) Adopt the new in tsn.
+				 * b) reset the map
+				 * c) Adopt the new out-tsn
+				 */
+				struct sctp_stream_reset_response_tsn *resp;
+				struct sctp_forward_tsn_chunk fwdtsn;
+				int abort_flag = 0;
+				if (respin == NULL) {
+					/* huh ? */
+					return (0);
+				}
+				if (ntohs(respin->ph.param_length) < sizeof(struct sctp_stream_reset_response_tsn)) {
+					return (0);
+				}
+				if (action == SCTP_STREAM_RESET_RESULT_PERFORMED) {
+					resp = (struct sctp_stream_reset_response_tsn *)respin;
+					asoc->stream_reset_outstanding--;
+					fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
+					fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
+					fwdtsn.new_cumulative_tsn = htonl(ntohl(resp->senders_next_tsn) - 1);
+					sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
+					if (abort_flag) {
+						return (1);
+					}
+					stcb->asoc.highest_tsn_inside_map = (ntohl(resp->senders_next_tsn) - 1);
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+						sctp_log_map(0, 7, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+					}
+
+					stcb->asoc.tsn_last_delivered = stcb->asoc.cumulative_tsn = stcb->asoc.highest_tsn_inside_map;
+					stcb->asoc.mapping_array_base_tsn = ntohl(resp->senders_next_tsn);
+					memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
+
+					stcb->asoc.highest_tsn_inside_nr_map = stcb->asoc.highest_tsn_inside_map;
+					memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
+
+					stcb->asoc.sending_seq = ntohl(resp->receivers_next_tsn);
+					stcb->asoc.last_acked_seq = stcb->asoc.cumulative_tsn;
+
+					sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
+					sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
+					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1), 0);
+				} else if (action == SCTP_STREAM_RESET_RESULT_DENIED) {
+					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
+								     SCTP_ASSOC_RESET_DENIED);
+				} else {
+					sctp_notify_stream_reset_tsn(stcb, stcb->asoc.sending_seq, (stcb->asoc.mapping_array_base_tsn + 1),
+								     SCTP_ASSOC_RESET_FAILED);
+				}
+			}
+			/* get rid of the request and get the request flags */
+			if (asoc->stream_reset_outstanding == 0) {
+				sctp_clean_up_stream_reset(stcb);
+			}
+		}
+	}
+	if (asoc->stream_reset_outstanding == 0) {
+		sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
+	}
+	return (0);
+}
+
+static void
+sctp_handle_str_reset_request_in(struct sctp_tcb *stcb,
+    struct sctp_tmit_chunk *chk,
+    struct sctp_stream_reset_in_request *req, int trunc)
+{
+	uint32_t seq;
+	int len, i;
+	int number_entries;
+	uint16_t temp;
+
+	/*
+	 * peer wants me to send a str-reset to him for my outgoing seq's if
+	 * seq_in is right.
+	 */
+	struct sctp_association *asoc = &stcb->asoc;
+
+	seq = ntohl(req->request_seq);
+	if (asoc->str_reset_seq_in == seq) {
+		asoc->last_reset_action[1] = asoc->last_reset_action[0];
+		if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if (trunc) {
+			/* Can't do it, since they exceeded our buffer size  */
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if (stcb->asoc.stream_reset_out_is_outstanding == 0) {
+			len = ntohs(req->ph.param_length);
+			number_entries = ((len - sizeof(struct sctp_stream_reset_in_request)) / sizeof(uint16_t));
+			if (number_entries) {
+				for (i = 0; i < number_entries; i++) {
+					temp = ntohs(req->list_of_streams[i]);
+					if (temp >= stcb->asoc.streamoutcnt) {
+						asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+						goto bad_boy;
+					}
+					req->list_of_streams[i] = temp;
+				}
+				for (i = 0; i < number_entries; i++) {
+					if (stcb->asoc.strmout[req->list_of_streams[i]].state == SCTP_STREAM_OPEN) {
+						stcb->asoc.strmout[req->list_of_streams[i]].state = SCTP_STREAM_RESET_PENDING;
+					}
+				}
+			} else {
+				/* Its all */
+				for (i = 0; i < stcb->asoc.streamoutcnt; i++) {
+					if (stcb->asoc.strmout[i].state == SCTP_STREAM_OPEN)
+						stcb->asoc.strmout[i].state = SCTP_STREAM_RESET_PENDING;
+				}
+			}
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+		} else {
+			/* Can't do it, since we have sent one out */
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
+		}
+	bad_boy:
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+		asoc->str_reset_seq_in++;
+	} else if (asoc->str_reset_seq_in - 1 == seq) {
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+	} else if (asoc->str_reset_seq_in - 2 == seq) {
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+	} else {
+		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+	}
+	sctp_send_stream_reset_out_if_possible(stcb, SCTP_SO_NOT_LOCKED);
+}
+
+static int
+sctp_handle_str_reset_request_tsn(struct sctp_tcb *stcb,
+    struct sctp_tmit_chunk *chk,
+    struct sctp_stream_reset_tsn_request *req)
+{
+	/* reset all in and out and update the tsn */
+	/*
+	 * A) reset my str-seq's on in and out. B) Select a receive next,
+	 * and set cum-ack to it. Also process this selected number as a
+	 * fwd-tsn as well. C) set in the response my next sending seq.
+	 */
+	struct sctp_forward_tsn_chunk fwdtsn;
+	struct sctp_association *asoc = &stcb->asoc;
+	int abort_flag = 0;
+	uint32_t seq;
+
+	seq = ntohl(req->request_seq);
+	if (asoc->str_reset_seq_in == seq) {
+		asoc->last_reset_action[1] = stcb->asoc.last_reset_action[0];
+		if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else {
+			fwdtsn.ch.chunk_length = htons(sizeof(struct sctp_forward_tsn_chunk));
+			fwdtsn.ch.chunk_type = SCTP_FORWARD_CUM_TSN;
+			fwdtsn.ch.chunk_flags = 0;
+			fwdtsn.new_cumulative_tsn = htonl(stcb->asoc.highest_tsn_inside_map + 1);
+			sctp_handle_forward_tsn(stcb, &fwdtsn, &abort_flag, NULL, 0);
+			if (abort_flag) {
+				return (1);
+			}
+			asoc->highest_tsn_inside_map += SCTP_STREAM_RESET_TSN_DELTA;
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+				sctp_log_map(0, 10, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+			}
+			asoc->tsn_last_delivered = asoc->cumulative_tsn = asoc->highest_tsn_inside_map;
+			asoc->mapping_array_base_tsn = asoc->highest_tsn_inside_map + 1;
+			memset(asoc->mapping_array, 0, asoc->mapping_array_size);
+			asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map;
+			memset(asoc->nr_mapping_array, 0, asoc->mapping_array_size);
+			atomic_add_int(&asoc->sending_seq, 1);
+			/* save off historical data for retrans */
+			asoc->last_sending_seq[1] = asoc->last_sending_seq[0];
+			asoc->last_sending_seq[0] = asoc->sending_seq;
+			asoc->last_base_tsnsent[1] = asoc->last_base_tsnsent[0];
+			asoc->last_base_tsnsent[0] = asoc->mapping_array_base_tsn;
+			sctp_reset_out_streams(stcb, 0, (uint16_t *) NULL);
+			sctp_reset_in_stream(stcb, 0, (uint16_t *) NULL);
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+			sctp_notify_stream_reset_tsn(stcb, asoc->sending_seq, (asoc->mapping_array_base_tsn + 1), 0);
+		}
+		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
+		                                 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
+		asoc->str_reset_seq_in++;
+	} else if (asoc->str_reset_seq_in - 1 == seq) {
+		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[0],
+		                                 asoc->last_sending_seq[0], asoc->last_base_tsnsent[0]);
+	} else if (asoc->str_reset_seq_in - 2 == seq) {
+		sctp_add_stream_reset_result_tsn(chk, seq, asoc->last_reset_action[1],
+		                                 asoc->last_sending_seq[1], asoc->last_base_tsnsent[1]);
+	} else {
+		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+	}
+	return (0);
+}
+
+static void
+sctp_handle_str_reset_request_out(struct sctp_tcb *stcb,
+    struct sctp_tmit_chunk *chk,
+    struct sctp_stream_reset_out_request *req, int trunc)
+{
+	uint32_t seq, tsn;
+	int number_entries, len;
+	struct sctp_association *asoc = &stcb->asoc;
+
+	seq = ntohl(req->request_seq);
+
+	/* now if its not a duplicate we process it */
+	if (asoc->str_reset_seq_in == seq) {
+		len = ntohs(req->ph.param_length);
+		number_entries = ((len - sizeof(struct sctp_stream_reset_out_request)) / sizeof(uint16_t));
+		/*
+		 * the sender is resetting, handle the list issue.. we must
+		 * a) verify if we can do the reset, if so no problem b) If
+		 * we can't do the reset we must copy the request. c) queue
+		 * it, and setup the data in processor to trigger it off
+		 * when needed and dequeue all the queued data.
+		 */
+		tsn = ntohl(req->send_reset_at_tsn);
+
+		/* move the reset action back one */
+		asoc->last_reset_action[1] = asoc->last_reset_action[0];
+		if ((asoc->local_strreset_support & SCTP_ENABLE_RESET_STREAM_REQ) == 0) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if (trunc) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
+			/* we can do it now */
+			sctp_reset_in_stream(stcb, number_entries, req->list_of_streams);
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+		} else {
+			/*
+			 * we must queue it up and thus wait for the TSN's
+			 * to arrive that are at or before tsn
+			 */
+			struct sctp_stream_reset_list *liste;
+			int siz;
+
+			siz = sizeof(struct sctp_stream_reset_list) + (number_entries * sizeof(uint16_t));
+			SCTP_MALLOC(liste, struct sctp_stream_reset_list *,
+				    siz, SCTP_M_STRESET);
+			if (liste == NULL) {
+				/* gak out of memory */
+				asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+				sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+				return;
+			}
+			liste->seq = seq;
+			liste->tsn = tsn;
+			liste->number_entries = number_entries;
+			memcpy(&liste->list_of_streams, req->list_of_streams, number_entries * sizeof(uint16_t));
+			TAILQ_INSERT_TAIL(&asoc->resetHead, liste, next_resp);
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_IN_PROGRESS;
+		}
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+		asoc->str_reset_seq_in++;
+	} else if ((asoc->str_reset_seq_in - 1) == seq) {
+		/*
+		 * one seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+	} else if ((asoc->str_reset_seq_in - 2) == seq) {
+		/*
+		 * two seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+	} else {
+		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+	}
+}
+
+static void
+sctp_handle_str_reset_add_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
+			       struct sctp_stream_reset_add_strm  *str_add)
+{
+	/*
+	 * Peer is requesting to add more streams.
+	 * If its within our max-streams we will
+	 * allow it.
+	 */
+	uint32_t num_stream, i;
+	uint32_t seq;
+	struct sctp_association *asoc = &stcb->asoc;
+	struct sctp_queued_to_read *ctl, *nctl;
+
+	/* Get the number. */
+	seq = ntohl(str_add->request_seq);
+	num_stream = ntohs(str_add->number_of_streams);
+	/* Now what would be the new total? */
+	if (asoc->str_reset_seq_in == seq) {
+		num_stream += stcb->asoc.streamincnt;
+		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
+		if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if ((num_stream > stcb->asoc.max_inbound_streams) ||
+		           (num_stream > 0xffff)) {
+			/* We must reject it they ask for to many */
+  denied:
+			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else {
+			/* Ok, we can do that :-) */
+			struct sctp_stream_in *oldstrm;
+
+			/* save off the old */
+			oldstrm = stcb->asoc.strmin;
+			SCTP_MALLOC(stcb->asoc.strmin, struct sctp_stream_in *,
+			            (num_stream * sizeof(struct sctp_stream_in)),
+			            SCTP_M_STRMI);
+			if (stcb->asoc.strmin == NULL) {
+				stcb->asoc.strmin = oldstrm;
+				goto denied;
+			}
+			/* copy off the old data */
+			for (i = 0; i < stcb->asoc.streamincnt; i++) {
+				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
+				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
+				stcb->asoc.strmin[i].sid = i;
+				stcb->asoc.strmin[i].last_mid_delivered = oldstrm[i].last_mid_delivered;
+				stcb->asoc.strmin[i].delivery_started = oldstrm[i].delivery_started;
+				stcb->asoc.strmin[i].pd_api_started = oldstrm[i].pd_api_started;
+				/* now anything on those queues? */
+				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].inqueue, next_instrm, nctl) {
+					TAILQ_REMOVE(&oldstrm[i].inqueue, ctl, next_instrm);
+					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].inqueue, ctl, next_instrm);
+				}
+				TAILQ_FOREACH_SAFE(ctl, &oldstrm[i].uno_inqueue, next_instrm, nctl) {
+					TAILQ_REMOVE(&oldstrm[i].uno_inqueue, ctl, next_instrm);
+					TAILQ_INSERT_TAIL(&stcb->asoc.strmin[i].uno_inqueue, ctl, next_instrm);
+				}
+			}
+			/* Init the new streams */
+			for (i = stcb->asoc.streamincnt; i < num_stream; i++) {
+				TAILQ_INIT(&stcb->asoc.strmin[i].inqueue);
+				TAILQ_INIT(&stcb->asoc.strmin[i].uno_inqueue);
+				stcb->asoc.strmin[i].sid = i;
+				stcb->asoc.strmin[i].last_mid_delivered = 0xffffffff;
+				stcb->asoc.strmin[i].pd_api_started = 0;
+				stcb->asoc.strmin[i].delivery_started = 0;
+			}
+			SCTP_FREE(oldstrm, SCTP_M_STRMI);
+			/* update the size */
+			stcb->asoc.streamincnt = num_stream;
+			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+			sctp_notify_stream_reset_add(stcb, stcb->asoc.streamincnt, stcb->asoc.streamoutcnt, 0);
+		}
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+		asoc->str_reset_seq_in++;
+	} else if ((asoc->str_reset_seq_in - 1) == seq) {
+		/*
+		 * one seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+	} else if ((asoc->str_reset_seq_in - 2) == seq) {
+		/*
+		 * two seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+	} else {
+		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+	}
+}
+
+static void
+sctp_handle_str_reset_add_out_strm(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk,
+				   struct sctp_stream_reset_add_strm  *str_add)
+{
+	/*
+	 * Peer is requesting to add more streams.
+	 * If its within our max-streams we will
+	 * allow it.
+	 */
+	uint16_t num_stream;
+	uint32_t seq;
+	struct sctp_association *asoc = &stcb->asoc;
+
+	/* Get the number. */
+	seq = ntohl(str_add->request_seq);
+	num_stream = ntohs(str_add->number_of_streams);
+	/* Now what would be the new total? */
+	if (asoc->str_reset_seq_in == seq) {
+		stcb->asoc.last_reset_action[1] = stcb->asoc.last_reset_action[0];
+		if ((asoc->local_strreset_support & SCTP_ENABLE_CHANGE_ASSOC_REQ) == 0) {
+			asoc->last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+		} else if (stcb->asoc.stream_reset_outstanding) {
+			/* We must reject it we have something pending */
+			stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS;
+		} else {
+			/* Ok, we can do that :-) */
+			int mychk;
+			mychk = stcb->asoc.streamoutcnt;
+			mychk += num_stream;
+			if (mychk < 0x10000) {
+				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_PERFORMED;
+				if (sctp_send_str_reset_req(stcb, 0, NULL, 0, 0, 1, num_stream, 0, 1)) {
+					stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+				}
+			} else {
+				stcb->asoc.last_reset_action[0] = SCTP_STREAM_RESET_RESULT_DENIED;
+			}
+		}
+		sctp_add_stream_reset_result(chk, seq, stcb->asoc.last_reset_action[0]);
+		asoc->str_reset_seq_in++;
+	} else if ((asoc->str_reset_seq_in - 1) == seq) {
+		/*
+		 * one seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[0]);
+	} else if ((asoc->str_reset_seq_in - 2) == seq) {
+		/*
+		 * two seq back, just echo back last action since my
+		 * response was lost.
+		 */
+		sctp_add_stream_reset_result(chk, seq, asoc->last_reset_action[1]);
+	} else {
+		sctp_add_stream_reset_result(chk, seq, SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO);
+	}
+}
+
+#ifdef __GNUC__
+__attribute__ ((noinline))
+#endif
+static int
+sctp_handle_stream_reset(struct sctp_tcb *stcb, struct mbuf *m, int offset,
+			 struct sctp_chunkhdr *ch_req)
+{
+	uint16_t remaining_length, param_len, ptype;
+	struct sctp_paramhdr pstore;
+	uint8_t cstore[SCTP_CHUNK_BUFFER_SIZE];
+	uint32_t seq = 0;
+	int num_req = 0;
+	int trunc = 0;
+	struct sctp_tmit_chunk *chk;
+	struct sctp_chunkhdr *ch;
+	struct sctp_paramhdr *ph;
+	int ret_code = 0;
+	int num_param = 0;
+
+	/* now it may be a reset or a reset-response */
+	remaining_length = ntohs(ch_req->chunk_length) - sizeof(struct sctp_chunkhdr);
+
+	/* setup for adding the response */
+	sctp_alloc_a_chunk(stcb, chk);
+	if (chk == NULL) {
+		return (ret_code);
+	}
+	chk->copy_by_ref = 0;
+	chk->rec.chunk_id.id = SCTP_STREAM_RESET;
+	chk->rec.chunk_id.can_take_data = 0;
+	chk->flags = 0;
+	chk->asoc = &stcb->asoc;
+	chk->no_fr_allowed = 0;
+	chk->book_size = chk->send_size = sizeof(struct sctp_chunkhdr);
+	chk->book_size_scale = 0;
+	chk->data = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
+	if (chk->data == NULL) {
+	strres_nochunk:
+		if (chk->data) {
+			sctp_m_freem(chk->data);
+			chk->data = NULL;
+		}
+		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+		return (ret_code);
+	}
+	SCTP_BUF_RESV_UF(chk->data, SCTP_MIN_OVERHEAD);
+
+	/* setup chunk parameters */
+	chk->sent = SCTP_DATAGRAM_UNSENT;
+	chk->snd_count = 0;
+	chk->whoTo = NULL;
+
+	ch = mtod(chk->data, struct sctp_chunkhdr *);
+	ch->chunk_type = SCTP_STREAM_RESET;
+	ch->chunk_flags = 0;
+	ch->chunk_length = htons(chk->send_size);
+	SCTP_BUF_LEN(chk->data) = SCTP_SIZE32(chk->send_size);
+	offset += sizeof(struct sctp_chunkhdr);
+	while (remaining_length >= sizeof(struct sctp_paramhdr)) {
+		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, sizeof(pstore), (uint8_t *)&pstore);
+		if (ph == NULL) {
+			/* TSNH */
+			break;
+		}
+		param_len = ntohs(ph->param_length);
+		if ((param_len > remaining_length) ||
+		    (param_len < (sizeof(struct sctp_paramhdr) + sizeof(uint32_t)))) {
+			/* bad parameter length */
+			break;
+		}
+		ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset, min(param_len, sizeof(cstore)),
+							   (uint8_t *)&cstore);
+		if (ph == NULL) {
+			/* TSNH */
+			break;
+		}
+		ptype = ntohs(ph->param_type);
+		num_param++;
+		if (param_len > sizeof(cstore)) {
+			trunc = 1;
+		} else {
+			trunc = 0;
+		}
+		if (num_param > SCTP_MAX_RESET_PARAMS) {
+			/* hit the max of parameters already sorry.. */
+			break;
+		}
+		if (ptype == SCTP_STR_RESET_OUT_REQUEST) {
+			struct sctp_stream_reset_out_request *req_out;
+
+			if (param_len < sizeof(struct sctp_stream_reset_out_request)) {
+				break;
+			}
+			req_out = (struct sctp_stream_reset_out_request *)ph;
+			num_req++;
+			if (stcb->asoc.stream_reset_outstanding) {
+				seq = ntohl(req_out->response_seq);
+				if (seq == stcb->asoc.str_reset_seq_out) {
+					/* implicit ack */
+					(void)sctp_handle_stream_reset_response(stcb, seq, SCTP_STREAM_RESET_RESULT_PERFORMED, NULL);
+				}
+			}
+			sctp_handle_str_reset_request_out(stcb, chk, req_out, trunc);
+		} else if (ptype == SCTP_STR_RESET_ADD_OUT_STREAMS) {
+			struct sctp_stream_reset_add_strm  *str_add;
+
+			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
+				break;
+			}
+			str_add = (struct sctp_stream_reset_add_strm  *)ph;
+			num_req++;
+			sctp_handle_str_reset_add_strm(stcb, chk, str_add);
+		} else if (ptype == SCTP_STR_RESET_ADD_IN_STREAMS) {
+			struct sctp_stream_reset_add_strm  *str_add;
+
+			if (param_len < sizeof(struct sctp_stream_reset_add_strm)) {
+				break;
+			}
+			str_add = (struct sctp_stream_reset_add_strm  *)ph;
+			num_req++;
+			sctp_handle_str_reset_add_out_strm(stcb, chk, str_add);
+		} else if (ptype == SCTP_STR_RESET_IN_REQUEST) {
+			struct sctp_stream_reset_in_request *req_in;
+
+			num_req++;
+			req_in = (struct sctp_stream_reset_in_request *)ph;
+			sctp_handle_str_reset_request_in(stcb, chk, req_in, trunc);
+		} else if (ptype == SCTP_STR_RESET_TSN_REQUEST) {
+			struct sctp_stream_reset_tsn_request *req_tsn;
+
+			num_req++;
+			req_tsn = (struct sctp_stream_reset_tsn_request *)ph;
+			if (sctp_handle_str_reset_request_tsn(stcb, chk, req_tsn)) {
+				ret_code = 1;
+				goto strres_nochunk;
+			}
+			/* no more */
+			break;
+		} else if (ptype == SCTP_STR_RESET_RESPONSE) {
+			struct sctp_stream_reset_response *resp;
+			uint32_t result;
+
+			if (param_len < sizeof(struct sctp_stream_reset_response)) {
+				break;
+			}
+			resp = (struct sctp_stream_reset_response *)ph;
+			seq = ntohl(resp->response_seq);
+			result = ntohl(resp->result);
+			if (sctp_handle_stream_reset_response(stcb, seq, result, resp)) {
+				ret_code = 1;
+				goto strres_nochunk;
+			}
+		} else {
+			break;
+		}
+		offset += SCTP_SIZE32(param_len);
+		if (remaining_length >= SCTP_SIZE32(param_len)) {
+			remaining_length -= SCTP_SIZE32(param_len);
+		} else {
+			remaining_length = 0;
+		}
+	}
+	if (num_req == 0) {
+		/* we have no response free the stuff */
+		goto strres_nochunk;
+	}
+	/* ok we have a chunk to link in */
+	TAILQ_INSERT_TAIL(&stcb->asoc.control_send_queue,
+			  chk,
+			  sctp_next);
+	stcb->asoc.ctrl_queue_cnt++;
+	return (ret_code);
+}
+
+/*
+ * Handle a router or endpoints report of a packet loss, there are two ways
+ * to handle this, either we get the whole packet and must disect it
+ * ourselves (possibly with truncation and or corruption) or it is a summary
+ * from a middle box that did the disecting for us.
+ */
+static void
+sctp_handle_packet_dropped(struct sctp_pktdrop_chunk *cp,
+    struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t limit)
+{
+	struct sctp_chunk_desc desc;
+	struct sctp_chunkhdr *chk_hdr;
+	struct sctp_data_chunk *data_chunk;
+	struct sctp_idata_chunk *idata_chunk;
+	uint32_t bottle_bw, on_queue;
+	uint32_t offset, chk_len;
+	uint16_t pktdrp_len;
+	uint8_t pktdrp_flags;
+
+	KASSERT(sizeof(struct sctp_pktdrop_chunk) <= limit,
+	        ("PKTDROP chunk too small"));
+	pktdrp_flags = cp->ch.chunk_flags;
+	pktdrp_len = ntohs(cp->ch.chunk_length);
+	KASSERT(limit <= pktdrp_len, ("Inconsistent limit"));
+	if (pktdrp_flags & SCTP_PACKET_TRUNCATED) {
+		if (ntohs(cp->trunc_len) <= pktdrp_len - sizeof(struct sctp_pktdrop_chunk)) {
+			/* The peer plays games with us. */
+			return;
+		}
+	}
+	limit -= sizeof(struct sctp_pktdrop_chunk);
+	offset = 0;
+	if (offset == limit) {
+		if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
+			SCTP_STAT_INCR(sctps_pdrpbwrpt);
+		}
+	} else if (offset + sizeof(struct sctphdr) > limit) {
+		/* Only a partial SCTP common header. */
+		SCTP_STAT_INCR(sctps_pdrpcrupt);
+		offset = limit;
+	} else {
+		/* XXX: Check embedded SCTP common header. */
+		offset += sizeof(struct sctphdr);
+	}
+	/* Now parse through the chunks themselves. */
+	while (offset < limit) {
+		if (offset + sizeof(struct sctp_chunkhdr) > limit) {
+			SCTP_STAT_INCR(sctps_pdrpcrupt);
+			break;
+		}
+		chk_hdr = (struct sctp_chunkhdr *)(cp->data + offset);
+		desc.chunk_type = chk_hdr->chunk_type;
+		/* get amount we need to move */
+		chk_len = (uint32_t)ntohs(chk_hdr->chunk_length);
+		if (chk_len < sizeof(struct sctp_chunkhdr)) {
+			/* Someone is lying... */
+			break;
+		}
+		if (desc.chunk_type == SCTP_DATA) {
+			if (stcb->asoc.idata_supported) {
+				/* Some is playing games with us. */
+				break;
+			}
+			if (chk_len <= sizeof(struct sctp_data_chunk)) {
+				/* Some is playing games with us. */
+				break;
+			}
+			if (chk_len < sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY) {
+				/* Not enough data bytes available in the chunk. */
+				SCTP_STAT_INCR(sctps_pdrpnedat);
+				goto next_chunk;
+			}
+			if (offset + sizeof(struct sctp_data_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
+				/* Not enough data in buffer. */
+				break;
+			}
+			data_chunk = (struct sctp_data_chunk *)(cp->data + offset);
+			memcpy(desc.data_bytes, data_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
+			desc.tsn_ifany = data_chunk->dp.tsn;
+			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
+				SCTP_STAT_INCR(sctps_pdrpmbda);
+			}
+		} else if (desc.chunk_type == SCTP_IDATA) {
+			if (!stcb->asoc.idata_supported) {
+				/* Some is playing games with us. */
+				break;
+			}
+			if (chk_len <= sizeof(struct sctp_idata_chunk)) {
+				/* Some is playing games with us. */
+				break;
+			}
+			if (chk_len < sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY) {
+				/* Not enough data bytes available in the chunk. */
+				SCTP_STAT_INCR(sctps_pdrpnedat);
+				goto next_chunk;
+			}
+			if (offset + sizeof(struct sctp_idata_chunk) + SCTP_NUM_DB_TO_VERIFY > limit) {
+				/* Not enough data in buffer. */
+				break;
+			}
+			idata_chunk = (struct sctp_idata_chunk *)(cp->data + offset);
+			memcpy(desc.data_bytes, idata_chunk + 1, SCTP_NUM_DB_TO_VERIFY);
+			desc.tsn_ifany = idata_chunk->dp.tsn;
+			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
+				SCTP_STAT_INCR(sctps_pdrpmbda);
+			}
+		} else {
+			if (pktdrp_flags & SCTP_FROM_MIDDLE_BOX) {
+				SCTP_STAT_INCR(sctps_pdrpmbct);
+			}
+		}
+		if (process_chunk_drop(stcb, &desc, net, pktdrp_flags)) {
+			SCTP_STAT_INCR(sctps_pdrppdbrk);
+			break;
+		}
+next_chunk:
+		offset += SCTP_SIZE32(chk_len);
+	}
+	/* Now update any rwnd --- possibly */
+	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) == 0) {
+		/* From a peer, we get a rwnd report */
+		uint32_t a_rwnd;
+
+		SCTP_STAT_INCR(sctps_pdrpfehos);
+
+		bottle_bw = ntohl(cp->bottle_bw);
+		on_queue = ntohl(cp->current_onq);
+		if (bottle_bw && on_queue) {
+			/* a rwnd report is in here */
+			if (bottle_bw > on_queue)
+				a_rwnd = bottle_bw - on_queue;
+			else
+				a_rwnd = 0;
+
+			if (a_rwnd == 0)
+				stcb->asoc.peers_rwnd = 0;
+			else {
+				if (a_rwnd > stcb->asoc.total_flight) {
+					stcb->asoc.peers_rwnd =
+					    a_rwnd - stcb->asoc.total_flight;
+				} else {
+					stcb->asoc.peers_rwnd = 0;
+				}
+				if (stcb->asoc.peers_rwnd <
+				    stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+					/* SWS sender side engages */
+					stcb->asoc.peers_rwnd = 0;
+				}
+			}
+		}
+	} else {
+		SCTP_STAT_INCR(sctps_pdrpfmbox);
+	}
+
+	/* now middle boxes in sat networks get a cwnd bump */
+	if ((pktdrp_flags & SCTP_FROM_MIDDLE_BOX) &&
+	    (stcb->asoc.sat_t3_loss_recovery == 0) &&
+	    (stcb->asoc.sat_network)) {
+		/*
+		 * This is debatable but for sat networks it makes sense
+		 * Note if a T3 timer has went off, we will prohibit any
+		 * changes to cwnd until we exit the t3 loss recovery.
+		 */
+		stcb->asoc.cc_functions.sctp_cwnd_update_after_packet_dropped(stcb,
+			net, cp, &bottle_bw, &on_queue);
+	}
+}
+
+/*
+ * handles all control chunks in a packet inputs: - m: mbuf chain, assumed to
+ * still contain IP/SCTP header - stcb: is the tcb found for this packet -
+ * offset: offset into the mbuf chain to first chunkhdr - length: is the
+ * length of the complete packet outputs: - length: modified to remaining
+ * length after control processing - netp: modified to new sctp_nets after
+ * cookie-echo processing - return NULL to discard the packet (ie. no asoc,
+ * bad packet,...) otherwise return the tcb for this packet
+ */
+#ifdef __GNUC__
+__attribute__ ((noinline))
+#endif
+static struct sctp_tcb *
+sctp_process_control(struct mbuf *m, int iphlen, int *offset, int length,
+    struct sockaddr *src, struct sockaddr *dst,
+    struct sctphdr *sh, struct sctp_chunkhdr *ch, struct sctp_inpcb *inp,
+    struct sctp_tcb *stcb, struct sctp_nets **netp, int *fwd_tsn_seen,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+    uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
+#endif
+    uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_association *asoc;
+	struct mbuf *op_err;
+	char msg[SCTP_DIAG_INFO_LEN];
+	uint32_t vtag_in;
+	int num_chunks = 0;	/* number of control chunks processed */
+	uint32_t chk_length, contiguous;
+	int ret;
+	int abort_no_unlock = 0;
+	int ecne_seen = 0;
+	int abort_flag;
+	/*
+	 * How big should this be, and should it be alloc'd? Lets try the
+	 * d-mtu-ceiling for now (2k) and that should hopefully work ...
+	 * until we get into jumbo grams and such..
+	 */
+	uint8_t chunk_buf[SCTP_CHUNK_BUFFER_SIZE];
+	int got_auth = 0;
+	uint32_t auth_offset = 0, auth_len = 0;
+	int auth_skipped = 0;
+	int asconf_cnt = 0;
+#if defined(__APPLE__) && !defined(__Userspace__)
+	struct socket *so;
+#endif
+
+	SCTPDBG(SCTP_DEBUG_INPUT1, "sctp_process_control: iphlen=%u, offset=%u, length=%u stcb:%p\n",
+		iphlen, *offset, length, (void *)stcb);
+
+	if (stcb) {
+		SCTP_TCB_LOCK_ASSERT(stcb);
+	}
+	/* validate chunk header length... */
+	if (ntohs(ch->chunk_length) < sizeof(*ch)) {
+		SCTPDBG(SCTP_DEBUG_INPUT1, "Invalid header length %d\n",
+			ntohs(ch->chunk_length));
+		*offset = length;
+		return (stcb);
+	}
+	/*
+	 * validate the verification tag
+	 */
+	vtag_in = ntohl(sh->v_tag);
+
+	if (ch->chunk_type == SCTP_INITIATION) {
+		SCTPDBG(SCTP_DEBUG_INPUT1, "Its an INIT of len:%d vtag:%x\n",
+			ntohs(ch->chunk_length), vtag_in);
+		if (vtag_in != 0) {
+			/* protocol error- silently discard... */
+			SCTP_STAT_INCR(sctps_badvtag);
+			if (stcb != NULL) {
+				SCTP_TCB_UNLOCK(stcb);
+			}
+			return (NULL);
+		}
+	} else if (ch->chunk_type != SCTP_COOKIE_ECHO) {
+		/*
+		 * If there is no stcb, skip the AUTH chunk and process
+		 * later after a stcb is found (to validate the lookup was
+		 * valid.
+		 */
+		if ((ch->chunk_type == SCTP_AUTHENTICATION) &&
+		    (stcb == NULL) &&
+		    (inp->auth_supported == 1)) {
+			/* save this chunk for later processing */
+			auth_skipped = 1;
+			auth_offset = *offset;
+			auth_len = ntohs(ch->chunk_length);
+
+			/* (temporarily) move past this chunk */
+			*offset += SCTP_SIZE32(auth_len);
+			if (*offset >= length) {
+				/* no more data left in the mbuf chain */
+				*offset = length;
+				return (NULL);
+			}
+			ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+								   sizeof(struct sctp_chunkhdr), chunk_buf);
+		}
+		if (ch == NULL) {
+			/* Help */
+			*offset = length;
+			return (stcb);
+		}
+		if (ch->chunk_type == SCTP_COOKIE_ECHO) {
+			goto process_control_chunks;
+		}
+		/*
+		 * first check if it's an ASCONF with an unknown src addr we
+		 * need to look inside to find the association
+		 */
+		if (ch->chunk_type == SCTP_ASCONF && stcb == NULL) {
+			struct sctp_chunkhdr *asconf_ch = ch;
+			uint32_t asconf_offset = 0, asconf_len = 0;
+
+			/* inp's refcount may be reduced */
+			SCTP_INP_INCR_REF(inp);
+
+			asconf_offset = *offset;
+			do {
+				asconf_len = ntohs(asconf_ch->chunk_length);
+				if (asconf_len < sizeof(struct sctp_asconf_paramhdr))
+					break;
+				stcb = sctp_findassociation_ep_asconf(m,
+				                                      *offset,
+				                                      dst,
+				                                      sh, &inp, netp, vrf_id);
+				if (stcb != NULL)
+					break;
+				asconf_offset += SCTP_SIZE32(asconf_len);
+				asconf_ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, asconf_offset,
+										  sizeof(struct sctp_chunkhdr), chunk_buf);
+			} while (asconf_ch != NULL && asconf_ch->chunk_type == SCTP_ASCONF);
+			if (stcb == NULL) {
+				/*
+				 * reduce inp's refcount if not reduced in
+				 * sctp_findassociation_ep_asconf().
+				 */
+				SCTP_INP_DECR_REF(inp);
+			}
+
+			/* now go back and verify any auth chunk to be sure */
+			if (auth_skipped && (stcb != NULL)) {
+				struct sctp_auth_chunk *auth;
+
+				if (auth_len <= SCTP_CHUNK_BUFFER_SIZE) {
+					auth = (struct sctp_auth_chunk *)sctp_m_getptr(m, auth_offset, auth_len, chunk_buf);
+					got_auth = 1;
+					auth_skipped = 0;
+				} else {
+					auth = NULL;
+				}
+				if ((auth == NULL) || sctp_handle_auth(stcb, auth, m,
+								       auth_offset)) {
+					/* auth HMAC failed so dump it */
+					*offset = length;
+					return (stcb);
+				} else {
+					/* remaining chunks are HMAC checked */
+					stcb->asoc.authenticated = 1;
+				}
+			}
+		}
+		if (stcb == NULL) {
+			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             msg);
+			/* no association, so it's out of the blue... */
+			sctp_handle_ootb(m, iphlen, *offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                 mflowtype, mflowid, inp->fibnum,
+#endif
+					 vrf_id, port);
+			*offset = length;
+			return (NULL);
+		}
+		asoc = &stcb->asoc;
+		/* ABORT and SHUTDOWN can use either v_tag... */
+		if ((ch->chunk_type == SCTP_ABORT_ASSOCIATION) ||
+		    (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) ||
+		    (ch->chunk_type == SCTP_PACKET_DROPPED)) {
+			/* Take the T-bit always into account. */
+			if ((((ch->chunk_flags & SCTP_HAD_NO_TCB) == 0) &&
+			     (vtag_in == asoc->my_vtag)) ||
+			    (((ch->chunk_flags & SCTP_HAD_NO_TCB) == SCTP_HAD_NO_TCB) &&
+			     (asoc->peer_vtag != htonl(0)) &&
+			     (vtag_in == asoc->peer_vtag))) {
+				/* this is valid */
+			} else {
+				/* drop this packet... */
+				SCTP_STAT_INCR(sctps_badvtag);
+				if (stcb != NULL) {
+					SCTP_TCB_UNLOCK(stcb);
+				}
+				return (NULL);
+			}
+		} else {
+			/* for all other chunks, vtag must match */
+			if (vtag_in != asoc->my_vtag) {
+				/* invalid vtag... */
+				SCTPDBG(SCTP_DEBUG_INPUT3,
+					"invalid vtag: %xh, expect %xh\n",
+					vtag_in, asoc->my_vtag);
+				SCTP_STAT_INCR(sctps_badvtag);
+				if (stcb != NULL) {
+					SCTP_TCB_UNLOCK(stcb);
+				}
+				*offset = length;
+				return (NULL);
+			}
+		}
+	}			/* end if !SCTP_COOKIE_ECHO */
+	/*
+	 * process all control chunks...
+	 */
+	if (((ch->chunk_type == SCTP_SELECTIVE_ACK) ||
+	     (ch->chunk_type == SCTP_NR_SELECTIVE_ACK) ||
+	     (ch->chunk_type == SCTP_HEARTBEAT_REQUEST)) &&
+	    (SCTP_GET_STATE(stcb) == SCTP_STATE_COOKIE_ECHOED)) {
+		/* implied cookie-ack.. we must have lost the ack */
+		sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb,
+				       *netp);
+	}
+
+ process_control_chunks:
+	while (IS_SCTP_CONTROL(ch)) {
+		/* validate chunk length */
+		chk_length = ntohs(ch->chunk_length);
+		SCTPDBG(SCTP_DEBUG_INPUT2, "sctp_process_control: processing a chunk type=%u, len=%u\n",
+			ch->chunk_type, chk_length);
+		SCTP_LTRACE_CHK(inp, stcb, ch->chunk_type, chk_length);
+		if (chk_length < sizeof(*ch) ||
+		    (*offset + (int)chk_length) > length) {
+			*offset = length;
+			return (stcb);
+		}
+		SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
+		/*
+		 * INIT and INIT-ACK only gets the init ack "header" portion
+		 * only because we don't have to process the peer's COOKIE.
+		 * All others get a complete chunk.
+		 */
+		switch (ch->chunk_type) {
+		case SCTP_INITIATION:
+			contiguous = sizeof(struct sctp_init_chunk);
+			break;
+		case SCTP_INITIATION_ACK:
+			contiguous = sizeof(struct sctp_init_ack_chunk);
+			break;
+		default:
+			contiguous = min(chk_length, sizeof(chunk_buf));
+			break;
+		}
+		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+		                                           contiguous,
+		                                           chunk_buf);
+		if (ch == NULL) {
+			*offset = length;
+			return (stcb);
+		}
+
+		num_chunks++;
+		/* Save off the last place we got a control from */
+		if (stcb != NULL) {
+			if (((netp != NULL) && (*netp != NULL)) || (ch->chunk_type == SCTP_ASCONF)) {
+				/*
+				 * allow last_control to be NULL if
+				 * ASCONF... ASCONF processing will find the
+				 * right net later
+				 */
+				if ((netp != NULL) && (*netp != NULL))
+					stcb->asoc.last_control_chunk_from = *netp;
+			}
+		}
+#ifdef SCTP_AUDITING_ENABLED
+		sctp_audit_log(0xB0, ch->chunk_type);
+#endif
+
+		/* check to see if this chunk required auth, but isn't */
+		if ((stcb != NULL) &&
+		    sctp_auth_is_required_chunk(ch->chunk_type, stcb->asoc.local_auth_chunks) &&
+		    !stcb->asoc.authenticated) {
+			/* "silently" ignore */
+			SCTP_STAT_INCR(sctps_recvauthmissing);
+			goto next_chunk;
+		}
+		switch (ch->chunk_type) {
+		case SCTP_INITIATION:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT\n");
+			/* The INIT chunk must be the only chunk. */
+			if ((num_chunks > 1) ||
+			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+				/*
+				 * RFC 4960bis requires stopping the
+				 * processing of the packet.
+				 */
+				*offset = length;
+				return (stcb);
+			}
+			/* Honor our resource limit. */
+			if (chk_length > SCTP_LARGEST_INIT_ACCEPTED) {
+				op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+				sctp_send_abort(m, iphlen, src, dst, sh, 0, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+				                mflowtype, mflowid, inp->fibnum,
+#endif
+				                vrf_id, port);
+				*offset = length;
+				if (stcb != NULL) {
+					SCTP_TCB_UNLOCK(stcb);
+				}
+				return (NULL);
+			}
+			sctp_handle_init(m, iphlen, *offset, src, dst, sh,
+			                 (struct sctp_init_chunk *)ch, inp,
+			                 stcb, *netp,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                 mflowtype, mflowid,
+#endif
+			                 vrf_id, port);
+			*offset = length;
+			if (stcb != NULL) {
+				SCTP_TCB_UNLOCK(stcb);
+			}
+			return (NULL);
+			break;
+		case SCTP_PAD_CHUNK:
+			break;
+		case SCTP_INITIATION_ACK:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_INIT_ACK\n");
+			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+				/* We are not interested anymore */
+				if ((stcb != NULL) && (stcb->asoc.total_output_queue_size)) {
+					;
+				} else {
+					*offset = length;
+					if (stcb != NULL) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+						so = SCTP_INP_SO(inp);
+						atomic_add_int(&stcb->asoc.refcnt, 1);
+						SCTP_TCB_UNLOCK(stcb);
+						SCTP_SOCKET_LOCK(so, 1);
+						SCTP_TCB_LOCK(stcb);
+						atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+						(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+						                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_29);
+#if defined(__APPLE__) && !defined(__Userspace__)
+						SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+					}
+					return (NULL);
+				}
+			}
+			/* The INIT-ACK chunk must be the only chunk. */
+			if ((num_chunks > 1) ||
+			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+				*offset = length;
+				return (stcb);
+			}
+			if ((netp != NULL) && (*netp != NULL)) {
+				ret = sctp_handle_init_ack(m, iphlen, *offset,
+				                           src, dst, sh,
+				                           (struct sctp_init_ack_chunk *)ch,
+				                           stcb, *netp,
+				                           &abort_no_unlock,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+				                           mflowtype, mflowid,
+#endif
+				                           vrf_id);
+			} else {
+				ret = -1;
+			}
+			*offset = length;
+			if (abort_no_unlock) {
+				return (NULL);
+			}
+			/*
+			 * Special case, I must call the output routine to
+			 * get the cookie echoed
+			 */
+			if ((stcb != NULL) && (ret == 0)) {
+				sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+			}
+			return (stcb);
+			break;
+		case SCTP_SELECTIVE_ACK:
+		case SCTP_NR_SELECTIVE_ACK:
+		{
+			int abort_now = 0;
+			uint32_t a_rwnd, cum_ack;
+			uint16_t num_seg, num_nr_seg, num_dup;
+			uint8_t flags;
+			int offset_seg, offset_dup;
+
+			SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
+				ch->chunk_type == SCTP_SELECTIVE_ACK ? "SCTP_SACK" : "SCTP_NR_SACK");
+			SCTP_STAT_INCR(sctps_recvsacks);
+			if (stcb == NULL) {
+				SCTPDBG(SCTP_DEBUG_INDATA1, "No stcb when processing %s chunk\n",
+				        (ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK");
+				break;
+			}
+			if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
+				if (chk_length < sizeof(struct sctp_sack_chunk)) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on SACK chunk, too small\n");
+					break;
+				}
+			} else {
+				if (stcb->asoc.nrsack_supported == 0) {
+					goto unknown_chunk;
+				}
+				if (chk_length < sizeof(struct sctp_nr_sack_chunk)) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size on NR_SACK chunk, too small\n");
+					break;
+				}
+			}
+			if (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_ACK_SENT) {
+				/*-
+				 * If we have sent a shutdown-ack, we will pay no
+				 * attention to a sack sent in to us since
+				 * we don't care anymore.
+				 */
+				break;
+			}
+			flags = ch->chunk_flags;
+			if (ch->chunk_type == SCTP_SELECTIVE_ACK) {
+				struct sctp_sack_chunk *sack;
+
+				sack = (struct sctp_sack_chunk *)ch;
+				cum_ack = ntohl(sack->sack.cum_tsn_ack);
+				num_seg = ntohs(sack->sack.num_gap_ack_blks);
+				num_nr_seg = 0;
+				num_dup = ntohs(sack->sack.num_dup_tsns);
+				a_rwnd = ntohl(sack->sack.a_rwnd);
+				if (sizeof(struct sctp_sack_chunk) +
+				    num_seg * sizeof(struct sctp_gap_ack_block) +
+				    num_dup * sizeof(uint32_t) != chk_length) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of SACK chunk\n");
+					break;
+				}
+				offset_seg = *offset + sizeof(struct sctp_sack_chunk);
+				offset_dup = offset_seg + num_seg * sizeof(struct sctp_gap_ack_block);
+			} else {
+				struct sctp_nr_sack_chunk *nr_sack;
+
+				nr_sack = (struct sctp_nr_sack_chunk *)ch;
+				cum_ack = ntohl(nr_sack->nr_sack.cum_tsn_ack);
+				num_seg = ntohs(nr_sack->nr_sack.num_gap_ack_blks);
+				num_nr_seg = ntohs(nr_sack->nr_sack.num_nr_gap_ack_blks);
+				num_dup = ntohs(nr_sack->nr_sack.num_dup_tsns);
+				a_rwnd = ntohl(nr_sack->nr_sack.a_rwnd);
+				if (sizeof(struct sctp_nr_sack_chunk) +
+				    (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block) +
+				    num_dup * sizeof(uint32_t) != chk_length) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size of NR_SACK chunk\n");
+					break;
+				}
+				offset_seg = *offset + sizeof(struct sctp_nr_sack_chunk);
+				offset_dup = offset_seg + (num_seg + num_nr_seg) * sizeof(struct sctp_gap_ack_block);
+			}
+			SCTPDBG(SCTP_DEBUG_INPUT3, "%s process cum_ack:%x num_seg:%d a_rwnd:%d\n",
+				(ch->chunk_type == SCTP_SELECTIVE_ACK) ? "SCTP_SACK" : "SCTP_NR_SACK",
+			        cum_ack, num_seg, a_rwnd);
+			stcb->asoc.seen_a_sack_this_pkt = 1;
+			if ((stcb->asoc.pr_sctp_cnt == 0) &&
+			    (num_seg == 0) && (num_nr_seg == 0) &&
+			    SCTP_TSN_GE(cum_ack, stcb->asoc.last_acked_seq) &&
+			    (stcb->asoc.saw_sack_with_frags == 0) &&
+			    (stcb->asoc.saw_sack_with_nr_frags == 0) &&
+			    (!TAILQ_EMPTY(&stcb->asoc.sent_queue))) {
+				/*
+				 * We have a SIMPLE sack having no
+				 * prior segments and data on sent
+				 * queue to be acked. Use the
+				 * faster path sack processing. We
+				 * also allow window update sacks
+				 * with no missing segments to go
+				 * this way too.
+				 */
+				sctp_express_handle_sack(stcb, cum_ack, a_rwnd,
+				                         &abort_now, ecne_seen);
+			} else {
+				if ((netp != NULL) && (*netp != NULL)) {
+					sctp_handle_sack(m, offset_seg, offset_dup, stcb,
+					                 num_seg, num_nr_seg, num_dup, &abort_now, flags,
+					                 cum_ack, a_rwnd, ecne_seen);
+				}
+			}
+			if (abort_now) {
+				/* ABORT signal from sack processing */
+				*offset = length;
+				return (NULL);
+			}
+			if (TAILQ_EMPTY(&stcb->asoc.send_queue) &&
+			    TAILQ_EMPTY(&stcb->asoc.sent_queue) &&
+			    (stcb->asoc.stream_queue_cnt == 0)) {
+				sctp_ulp_notify(SCTP_NOTIFY_SENDER_DRY, stcb,  0, NULL, SCTP_SO_NOT_LOCKED);
+			}
+			break;
+		}
+		case SCTP_HEARTBEAT_REQUEST:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT\n");
+			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
+				SCTP_STAT_INCR(sctps_recvheartbeat);
+				sctp_send_heartbeat_ack(stcb, m, *offset,
+				                        chk_length, *netp);
+			}
+			break;
+		case SCTP_HEARTBEAT_ACK:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_HEARTBEAT_ACK\n");
+			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_heartbeat_chunk))) {
+				/* Its not ours */
+				break;
+			}
+			SCTP_STAT_INCR(sctps_recvheartbeatack);
+			if ((netp != NULL) && (*netp != NULL)) {
+				sctp_handle_heartbeat_ack((struct sctp_heartbeat_chunk *)ch,
+				                          stcb, *netp);
+			}
+			break;
+		case SCTP_ABORT_ASSOCIATION:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ABORT, stcb %p\n",
+				(void *)stcb);
+			*offset = length;
+			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
+				if (sctp_handle_abort((struct sctp_abort_chunk *)ch, stcb, *netp)) {
+					return (NULL);
+				} else {
+					return (stcb);
+				}
+			} else {
+				return (NULL);
+			}
+			break;
+		case SCTP_SHUTDOWN:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN, stcb %p\n",
+				(void *)stcb);
+			if ((stcb == NULL) || (chk_length != sizeof(struct sctp_shutdown_chunk))) {
+				break;
+			}
+			if ((netp != NULL) && (*netp != NULL)) {
+				abort_flag = 0;
+				sctp_handle_shutdown((struct sctp_shutdown_chunk *)ch,
+				                     stcb, *netp, &abort_flag);
+				if (abort_flag) {
+					*offset = length;
+					return (NULL);
+				}
+			}
+			break;
+		case SCTP_SHUTDOWN_ACK:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_ACK, stcb %p\n", (void *)stcb);
+			if ((chk_length == sizeof(struct sctp_shutdown_ack_chunk)) &&
+			    (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
+				sctp_handle_shutdown_ack((struct sctp_shutdown_ack_chunk *)ch, stcb, *netp);
+				*offset = length;
+				return (NULL);
+			}
+			break;
+		case SCTP_OPERATION_ERROR:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_OP_ERR\n");
+			if ((stcb != NULL) && (netp != NULL) && (*netp != NULL) &&
+			    sctp_handle_error(ch, stcb, *netp, contiguous) < 0) {
+				*offset = length;
+				return (NULL);
+			}
+			break;
+		case SCTP_COOKIE_ECHO:
+			SCTPDBG(SCTP_DEBUG_INPUT3,
+				"SCTP_COOKIE_ECHO, stcb %p\n", (void *)stcb);
+			if ((stcb != NULL) && (stcb->asoc.total_output_queue_size > 0)) {
+				;
+			} else {
+				if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+					/* We are not interested anymore */
+				abend:
+					if (stcb != NULL) {
+						SCTP_TCB_UNLOCK(stcb);
+					}
+					*offset = length;
+					return (NULL);
+				}
+			}
+			/*-
+			 * First are we accepting? We do this again here
+			 * since it is possible that a previous endpoint WAS
+			 * listening responded to a INIT-ACK and then
+			 * closed. We opened and bound.. and are now no
+			 * longer listening.
+			 *
+			 * XXXGL: notes on checking listen queue length.
+			 * 1) SCTP_IS_LISTENING() doesn't necessarily mean
+			 *    SOLISTENING(), because a listening "UDP type"
+			 *    socket isn't listening in terms of the socket
+			 *    layer.  It is a normal data flow socket, that
+			 *    can fork off new connections.  Thus, we should
+			 *    look into sol_qlen only in case we are !UDP.
+			 * 2) Checking sol_qlen in general requires locking
+			 *    the socket, and this code lacks that.
+			 */
+			if ((stcb == NULL) &&
+			    (!SCTP_IS_LISTENING(inp) ||
+			     (((inp->sctp_flags & SCTP_PCB_FLAGS_UDPTYPE) == 0) &&
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			      inp->sctp_socket->sol_qlen >= inp->sctp_socket->sol_qlimit))) {
+#else
+			      inp->sctp_socket->so_qlen >= inp->sctp_socket->so_qlimit))) {
+#endif
+				if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
+				    (SCTP_BASE_SYSCTL(sctp_abort_if_one_2_one_hits_limit))) {
+					op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+					sctp_abort_association(inp, stcb, m, iphlen,
+					                       src, dst, sh, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+					                       mflowtype, mflowid,
+#endif
+					                       vrf_id, port);
+				}
+				*offset = length;
+				return (NULL);
+			} else {
+				struct mbuf *ret_buf;
+				struct sctp_inpcb *linp;
+				struct sctp_tmit_chunk *chk;
+
+				if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE |
+				    SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
+					goto abend;
+				}
+
+				if (stcb) {
+					linp = NULL;
+				} else {
+					linp = inp;
+				}
+
+				if (linp != NULL) {
+					SCTP_ASOC_CREATE_LOCK(linp);
+				}
+
+				if (netp != NULL) {
+					struct sctp_tcb *locked_stcb;
+
+					locked_stcb = stcb;
+					ret_buf =
+						sctp_handle_cookie_echo(m, iphlen,
+						                        *offset,
+						                        src, dst,
+						                        sh,
+						                        (struct sctp_cookie_echo_chunk *)ch,
+						                        &inp, &stcb, netp,
+						                        auth_skipped,
+						                        auth_offset,
+						                        auth_len,
+						                        &locked_stcb,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+						                        mflowtype,
+						                        mflowid,
+#endif
+						                        vrf_id,
+						                        port);
+					if ((locked_stcb != NULL) && (locked_stcb != stcb)) {
+						SCTP_TCB_UNLOCK(locked_stcb);
+					}
+					if (stcb != NULL) {
+						SCTP_TCB_LOCK_ASSERT(stcb);
+					}
+				} else {
+					ret_buf = NULL;
+				}
+				if (linp != NULL) {
+					SCTP_ASOC_CREATE_UNLOCK(linp);
+				}
+				if (ret_buf == NULL) {
+					if (stcb != NULL) {
+						SCTP_TCB_UNLOCK(stcb);
+					}
+					SCTPDBG(SCTP_DEBUG_INPUT3,
+						"GAK, null buffer\n");
+					*offset = length;
+					return (NULL);
+				}
+				/* if AUTH skipped, see if it verified... */
+				if (auth_skipped) {
+					got_auth = 1;
+					auth_skipped = 0;
+				}
+				/* Restart the timer if we have pending data */
+				TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
+					if (chk->whoTo != NULL) {
+						break;
+					}
+				}
+				if (chk != NULL) {
+					sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
+				}
+			}
+			break;
+		case SCTP_COOKIE_ACK:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_COOKIE_ACK, stcb %p\n", (void *)stcb);
+			if ((stcb == NULL) || chk_length != sizeof(struct sctp_cookie_ack_chunk)) {
+				break;
+			}
+			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+				/* We are not interested anymore */
+				if ((stcb) && (stcb->asoc.total_output_queue_size)) {
+					;
+				} else if (stcb) {
+#if defined(__APPLE__) && !defined(__Userspace__)
+					so = SCTP_INP_SO(inp);
+					atomic_add_int(&stcb->asoc.refcnt, 1);
+					SCTP_TCB_UNLOCK(stcb);
+					SCTP_SOCKET_LOCK(so, 1);
+					SCTP_TCB_LOCK(stcb);
+					atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+					(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+					                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_30);
+#if defined(__APPLE__) && !defined(__Userspace__)
+					SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+					*offset = length;
+					return (NULL);
+				}
+			}
+			if ((netp != NULL) && (*netp != NULL)) {
+				sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, *netp);
+			}
+			break;
+		case SCTP_ECN_ECHO:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_ECHO\n");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.ecn_supported == 0) {
+				goto unknown_chunk;
+			}
+			if ((chk_length != sizeof(struct sctp_ecne_chunk)) &&
+			    (chk_length != sizeof(struct old_sctp_ecne_chunk))) {
+				break;
+			}
+			sctp_handle_ecn_echo((struct sctp_ecne_chunk *)ch, stcb);
+			ecne_seen = 1;
+			break;
+		case SCTP_ECN_CWR:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ECN_CWR\n");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.ecn_supported == 0) {
+				goto unknown_chunk;
+			}
+			if (chk_length != sizeof(struct sctp_cwr_chunk)) {
+				break;
+			}
+			sctp_handle_ecn_cwr((struct sctp_cwr_chunk *)ch, stcb, *netp);
+			break;
+		case SCTP_SHUTDOWN_COMPLETE:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_SHUTDOWN_COMPLETE, stcb %p\n", (void *)stcb);
+			/* must be first and only chunk */
+			if ((num_chunks > 1) ||
+			    (length - *offset > (int)SCTP_SIZE32(chk_length))) {
+				*offset = length;
+				return (stcb);
+			}
+			if ((chk_length == sizeof(struct sctp_shutdown_complete_chunk)) &&
+			    (stcb != NULL) && (netp != NULL) && (*netp != NULL)) {
+				sctp_handle_shutdown_complete((struct sctp_shutdown_complete_chunk *)ch,
+				                              stcb, *netp);
+				*offset = length;
+				return (NULL);
+			}
+			break;
+		case SCTP_ASCONF:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF\n");
+			if (stcb != NULL) {
+				if (stcb->asoc.asconf_supported == 0) {
+					goto unknown_chunk;
+				}
+				sctp_handle_asconf(m, *offset, src,
+				                   (struct sctp_asconf_chunk *)ch, stcb, asconf_cnt == 0);
+				asconf_cnt++;
+			}
+			break;
+		case SCTP_ASCONF_ACK:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_ASCONF_ACK\n");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.asconf_supported == 0) {
+				goto unknown_chunk;
+			}
+			if (chk_length < sizeof(struct sctp_asconf_ack_chunk)) {
+				break;
+			}
+			if ((netp != NULL) && (*netp != NULL)) {
+				/* He's alive so give him credit */
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
+					sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
+					               stcb->asoc.overall_error_count,
+					               0,
+					               SCTP_FROM_SCTP_INPUT,
+					               __LINE__);
+				}
+				stcb->asoc.overall_error_count = 0;
+				sctp_handle_asconf_ack(m, *offset,
+				                       (struct sctp_asconf_ack_chunk *)ch, stcb, *netp, &abort_no_unlock);
+				if (abort_no_unlock)
+					return (NULL);
+			}
+			break;
+		case SCTP_FORWARD_CUM_TSN:
+		case SCTP_IFORWARD_CUM_TSN:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "%s\n",
+				ch->chunk_type == SCTP_FORWARD_CUM_TSN ? "FORWARD_TSN" : "I_FORWARD_TSN");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.prsctp_supported == 0) {
+				goto unknown_chunk;
+			}
+			if (chk_length < sizeof(struct sctp_forward_tsn_chunk)) {
+				break;
+			}
+			if (((stcb->asoc.idata_supported == 1) && (ch->chunk_type == SCTP_FORWARD_CUM_TSN)) ||
+			    ((stcb->asoc.idata_supported == 0) && (ch->chunk_type == SCTP_IFORWARD_CUM_TSN))) {
+				if (ch->chunk_type == SCTP_FORWARD_CUM_TSN) {
+					SCTP_SNPRINTF(msg, sizeof(msg), "%s", "FORWARD-TSN chunk received when I-FORWARD-TSN was negotiated");
+				} else {
+					SCTP_SNPRINTF(msg, sizeof(msg), "%s", "I-FORWARD-TSN chunk received when FORWARD-TSN was negotiated");
+				}
+				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+				sctp_abort_an_association(inp, stcb, op_err, false, SCTP_SO_NOT_LOCKED);
+				*offset = length;
+				return (NULL);
+			}
+			*fwd_tsn_seen = 1;
+			if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
+				/* We are not interested anymore */
+#if defined(__APPLE__) && !defined(__Userspace__)
+				so = SCTP_INP_SO(inp);
+				atomic_add_int(&stcb->asoc.refcnt, 1);
+				SCTP_TCB_UNLOCK(stcb);
+				SCTP_SOCKET_LOCK(so, 1);
+				SCTP_TCB_LOCK(stcb);
+				atomic_subtract_int(&stcb->asoc.refcnt, 1);
+#endif
+				(void)sctp_free_assoc(inp, stcb, SCTP_NORMAL_PROC,
+				                      SCTP_FROM_SCTP_INPUT + SCTP_LOC_31);
+#if defined(__APPLE__) && !defined(__Userspace__)
+				SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+				*offset = length;
+				return (NULL);
+			}
+			/*
+			 * For sending a SACK this looks like DATA
+			 * chunks.
+			 */
+			stcb->asoc.last_data_chunk_from = stcb->asoc.last_control_chunk_from;
+			abort_flag = 0;
+			sctp_handle_forward_tsn(stcb,
+			                        (struct sctp_forward_tsn_chunk *)ch, &abort_flag, m, *offset);
+			if (abort_flag) {
+				*offset = length;
+				return (NULL);
+			}
+			break;
+		case SCTP_STREAM_RESET:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_STREAM_RESET\n");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.reconfig_supported == 0) {
+				goto unknown_chunk;
+			}
+			if (chk_length < sizeof(struct sctp_stream_reset_tsn_req)) {
+				break;
+			}
+			if (sctp_handle_stream_reset(stcb, m, *offset, ch)) {
+				/* stop processing */
+				*offset = length;
+				return (NULL);
+			}
+			break;
+		case SCTP_PACKET_DROPPED:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_PACKET_DROPPED\n");
+			if (stcb == NULL) {
+				break;
+			}
+			if (stcb->asoc.pktdrop_supported == 0) {
+				goto unknown_chunk;
+			}
+			if (chk_length < sizeof(struct sctp_pktdrop_chunk)) {
+				break;
+			}
+			if ((netp != NULL) && (*netp != NULL)) {
+				sctp_handle_packet_dropped((struct sctp_pktdrop_chunk *)ch,
+				                           stcb, *netp,
+				                           min(chk_length, contiguous));
+			}
+			break;
+		case SCTP_AUTHENTICATION:
+			SCTPDBG(SCTP_DEBUG_INPUT3, "SCTP_AUTHENTICATION\n");
+			if (stcb == NULL) {
+				/* save the first AUTH for later processing */
+				if (auth_skipped == 0) {
+					auth_offset = *offset;
+					auth_len = chk_length;
+					auth_skipped = 1;
+				}
+				/* skip this chunk (temporarily) */
+				break;
+			}
+			if (stcb->asoc.auth_supported == 0) {
+				goto unknown_chunk;
+			}
+			if ((chk_length < (sizeof(struct sctp_auth_chunk))) ||
+			    (chk_length > (sizeof(struct sctp_auth_chunk) +
+			                  SCTP_AUTH_DIGEST_LEN_MAX))) {
+				/* Its not ours */
+				*offset = length;
+				return (stcb);
+			}
+			if (got_auth == 1) {
+				/* skip this chunk... it's already auth'd */
+				break;
+			}
+			got_auth = 1;
+			if (sctp_handle_auth(stcb, (struct sctp_auth_chunk *)ch, m, *offset)) {
+				/* auth HMAC failed so dump the packet */
+				*offset = length;
+				return (stcb);
+			} else {
+				/* remaining chunks are HMAC checked */
+				stcb->asoc.authenticated = 1;
+			}
+			break;
+
+		default:
+		unknown_chunk:
+			/* it's an unknown chunk! */
+			if ((ch->chunk_type & 0x40) &&
+			    (stcb != NULL) &&
+			    (SCTP_GET_STATE(stcb) != SCTP_STATE_EMPTY) &&
+			    (SCTP_GET_STATE(stcb) != SCTP_STATE_INUSE) &&
+			    (SCTP_GET_STATE(stcb) != SCTP_STATE_COOKIE_WAIT)) {
+				struct sctp_gen_error_cause *cause;
+				int len;
+
+				op_err = sctp_get_mbuf_for_msg(sizeof(struct sctp_gen_error_cause),
+				                               0, M_NOWAIT, 1, MT_DATA);
+				if (op_err != NULL) {
+					len = min(SCTP_SIZE32(chk_length), (uint32_t)(length - *offset));
+					cause = mtod(op_err, struct sctp_gen_error_cause *);
+					cause->code = htons(SCTP_CAUSE_UNRECOG_CHUNK);
+					cause->length = htons((uint16_t)(len + sizeof(struct sctp_gen_error_cause)));
+					SCTP_BUF_LEN(op_err) = sizeof(struct sctp_gen_error_cause);
+					SCTP_BUF_NEXT(op_err) = SCTP_M_COPYM(m, *offset, len, M_NOWAIT);
+					if (SCTP_BUF_NEXT(op_err) != NULL) {
+#ifdef SCTP_MBUF_LOGGING
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+							sctp_log_mbc(SCTP_BUF_NEXT(op_err), SCTP_MBUF_ICOPY);
+						}
+#endif
+						sctp_queue_op_err(stcb, op_err);
+					} else {
+						sctp_m_freem(op_err);
+					}
+				}
+			}
+			if ((ch->chunk_type & 0x80) == 0) {
+				/* discard this packet */
+				*offset = length;
+				return (stcb);
+			}	/* else skip this bad chunk and continue... */
+			break;
+		}		/* switch (ch->chunk_type) */
+
+	next_chunk:
+		/* get the next chunk */
+		*offset += SCTP_SIZE32(chk_length);
+		if (*offset >= length) {
+			/* no more data left in the mbuf chain */
+			break;
+		}
+		ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, *offset,
+		                                           sizeof(struct sctp_chunkhdr), chunk_buf);
+		if (ch == NULL) {
+			*offset = length;
+			return (stcb);
+		}
+	}			/* while */
+
+	if ((asconf_cnt > 0) && (stcb != NULL)) {
+		sctp_send_asconf_ack(stcb);
+	}
+	return (stcb);
+}
+
+/*
+ * common input chunk processing (v4 and v6)
+ */
+void
+sctp_common_input_processing(struct mbuf **mm, int iphlen, int offset, int length,
+                             struct sockaddr *src, struct sockaddr *dst,
+                             struct sctphdr *sh, struct sctp_chunkhdr *ch,
+                             uint8_t compute_crc,
+                             uint8_t ecn_bits,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+                             uint8_t mflowtype, uint32_t mflowid, uint16_t fibnum,
+#endif
+                             uint32_t vrf_id, uint16_t port)
+{
+	uint32_t high_tsn;
+	int fwd_tsn_seen = 0, data_processed = 0;
+	struct mbuf *m = *mm, *op_err;
+	char msg[SCTP_DIAG_INFO_LEN];
+	int un_sent;
+	int cnt_ctrl_ready = 0;
+	struct sctp_inpcb *inp = NULL, *inp_decr = NULL;
+	struct sctp_tcb *stcb = NULL;
+	struct sctp_nets *net = NULL;
+#if defined(__Userspace__)
+	struct socket *upcall_socket = NULL;
+#endif
+
+	SCTP_STAT_INCR(sctps_recvdatagrams);
+#ifdef SCTP_AUDITING_ENABLED
+	sctp_audit_log(0xE0, 1);
+	sctp_auditing(0, inp, stcb, net);
+#endif
+	if (compute_crc != 0) {
+		uint32_t check, calc_check;
+
+		check = sh->checksum;
+		sh->checksum = 0;
+		calc_check = sctp_calculate_cksum(m, iphlen);
+		sh->checksum = check;
+		if (calc_check != check) {
+			SCTPDBG(SCTP_DEBUG_INPUT1, "Bad CSUM on SCTP packet calc_check:%x check:%x  m:%p mlen:%d iphlen:%d\n",
+			        calc_check, check, (void *)m, length, iphlen);
+			stcb = sctp_findassociation_addr(m, offset, src, dst,
+			                                 sh, ch, &inp, &net, vrf_id);
+#if defined(INET) || defined(INET6)
+			if ((ch->chunk_type != SCTP_INITIATION) &&
+			    (net != NULL) && (net->port != port)) {
+				if (net->port == 0) {
+					/* UDP encapsulation turned on. */
+					net->mtu -= sizeof(struct udphdr);
+					if (stcb->asoc.smallest_mtu > net->mtu) {
+						sctp_pathmtu_adjustment(stcb, net->mtu, true);
+					}
+				} else if (port == 0) {
+					/* UDP encapsulation turned off. */
+					net->mtu += sizeof(struct udphdr);
+					/* XXX Update smallest_mtu */
+				}
+				net->port = port;
+			}
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			if (net != NULL) {
+				net->flowtype = mflowtype;
+				net->flowid = mflowid;
+			}
+			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+			if ((inp != NULL) && (stcb != NULL)) {
+				sctp_send_packet_dropped(stcb, net, m, length, iphlen, 1);
+				sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_INPUT_ERROR, SCTP_SO_NOT_LOCKED);
+			} else if ((inp != NULL) && (stcb == NULL)) {
+				inp_decr = inp;
+			}
+			SCTP_STAT_INCR(sctps_badsum);
+			SCTP_STAT_INCR_COUNTER32(sctps_checksumerrors);
+			goto out;
+		}
+	}
+	/* Destination port of 0 is illegal, based on RFC4960. */
+	if (sh->dest_port == 0) {
+		SCTP_STAT_INCR(sctps_hdrops);
+		goto out;
+	}
+	stcb = sctp_findassociation_addr(m, offset, src, dst,
+	                                 sh, ch, &inp, &net, vrf_id);
+#if defined(INET) || defined(INET6)
+	if ((ch->chunk_type != SCTP_INITIATION) &&
+	    (net != NULL) && (net->port != port)) {
+		if (net->port == 0) {
+			/* UDP encapsulation turned on. */
+			net->mtu -= sizeof(struct udphdr);
+			if (stcb->asoc.smallest_mtu > net->mtu) {
+				sctp_pathmtu_adjustment(stcb, net->mtu, true);
+			}
+		} else if (port == 0) {
+			/* UDP encapsulation turned off. */
+			net->mtu += sizeof(struct udphdr);
+			/* XXX Update smallest_mtu */
+		}
+		net->port = port;
+	}
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	if (net != NULL) {
+		net->flowtype = mflowtype;
+		net->flowid = mflowid;
+	}
+#endif
+	if (inp == NULL) {
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+		SCTP_STAT_INCR(sctps_noport);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		if (badport_bandlim(BANDLIM_SCTP_OOTB) < 0) {
+			goto out;
+		}
+#endif
+		if (ch->chunk_type == SCTP_SHUTDOWN_ACK) {
+			SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
+			sctp_send_shutdown_complete2(src, dst, sh,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                             mflowtype, mflowid, fibnum,
+#endif
+			                             vrf_id, port);
+			goto out;
+		}
+		if (ch->chunk_type == SCTP_SHUTDOWN_COMPLETE) {
+			SCTP_STAT_INCR_COUNTER64(sctps_incontrolchunks);
+			goto out;
+		}
+		if (ch->chunk_type != SCTP_ABORT_ASSOCIATION) {
+			if ((SCTP_BASE_SYSCTL(sctp_blackhole) == 0) ||
+			    ((SCTP_BASE_SYSCTL(sctp_blackhole) == 1) &&
+			     (ch->chunk_type != SCTP_INIT))) {
+				op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+				                             "Out of the blue");
+				sctp_send_abort(m, iphlen, src, dst,
+				                sh, 0, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+				                mflowtype, mflowid, fibnum,
+#endif
+				                vrf_id, port);
+			}
+		}
+		goto out;
+	} else if (stcb == NULL) {
+		inp_decr = inp;
+	}
+	SCTPDBG(SCTP_DEBUG_INPUT1, "Ok, Common input processing called, m:%p iphlen:%d offset:%d length:%d stcb:%p\n",
+		(void *)m, iphlen, offset, length, (void *)stcb);
+	if (stcb) {
+		/* always clear this before beginning a packet */
+		stcb->asoc.authenticated = 0;
+		stcb->asoc.seen_a_sack_this_pkt = 0;
+		SCTPDBG(SCTP_DEBUG_INPUT1, "stcb:%p state:%x\n",
+			(void *)stcb, stcb->asoc.state);
+
+		if ((stcb->asoc.state & SCTP_STATE_WAS_ABORTED) ||
+		    (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED)) {
+			/*-
+			 * If we hit here, we had a ref count
+			 * up when the assoc was aborted and the
+			 * timer is clearing out the assoc, we should
+			 * NOT respond to any packet.. its OOTB.
+			 */
+			SCTP_TCB_UNLOCK(stcb);
+			stcb = NULL;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             msg);
+			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                 mflowtype, mflowid, inp->fibnum,
+#endif
+			                 vrf_id, port);
+			goto out;
+		}
+	}
+#if defined(__Userspace__)
+	if ((stcb != NULL) &&
+	    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
+	    (stcb->sctp_socket != NULL)) {
+		if (stcb->sctp_socket->so_head != NULL) {
+			upcall_socket = stcb->sctp_socket->so_head;
+		} else {
+			upcall_socket = stcb->sctp_socket;
+		}
+		SOCK_LOCK(upcall_socket);
+		soref(upcall_socket);
+		SOCK_UNLOCK(upcall_socket);
+	}
+#endif
+	if (IS_SCTP_CONTROL(ch)) {
+		/* process the control portion of the SCTP packet */
+		/* sa_ignore NO_NULL_CHK */
+		stcb = sctp_process_control(m, iphlen, &offset, length,
+		                            src, dst, sh, ch,
+		                            inp, stcb, &net, &fwd_tsn_seen,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+		                            mflowtype, mflowid, fibnum,
+#endif
+		                            vrf_id, port);
+		if (stcb) {
+			/* This covers us if the cookie-echo was there
+			 * and it changes our INP.
+			 */
+			inp = stcb->sctp_ep;
+#if defined(INET) || defined(INET6)
+			if ((ch->chunk_type != SCTP_INITIATION) &&
+			    (net != NULL) && (net->port != port)) {
+				if (net->port == 0) {
+					/* UDP encapsulation turned on. */
+					net->mtu -= sizeof(struct udphdr);
+					if (stcb->asoc.smallest_mtu > net->mtu) {
+						sctp_pathmtu_adjustment(stcb, net->mtu, true);
+					}
+				} else if (port == 0) {
+					/* UDP encapsulation turned off. */
+					net->mtu += sizeof(struct udphdr);
+					/* XXX Update smallest_mtu */
+				}
+				net->port = port;
+			}
+#endif
+		}
+	} else {
+		/*
+		 * no control chunks, so pre-process DATA chunks (these
+		 * checks are taken care of by control processing)
+		 */
+
+		/*
+		 * if DATA only packet, and auth is required, then punt...
+		 * can't have authenticated without any AUTH (control)
+		 * chunks
+		 */
+		if ((stcb != NULL) &&
+		    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks)) {
+			/* "silently" ignore */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+			SCTP_STAT_INCR(sctps_recvauthmissing);
+			goto out;
+		}
+		if (stcb == NULL) {
+			/* out of the blue DATA chunk */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			SCTP_PROBE5(receive, NULL, NULL, m, NULL, sh);
+#endif
+			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             msg);
+			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                 mflowtype, mflowid, fibnum,
+#endif
+					 vrf_id, port);
+			goto out;
+		}
+		if (stcb->asoc.my_vtag != ntohl(sh->v_tag)) {
+			/* v_tag mismatch! */
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+			SCTP_STAT_INCR(sctps_badvtag);
+			goto out;
+		}
+	}
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	SCTP_PROBE5(receive, NULL, stcb, m, stcb, sh);
+#endif
+	if (stcb == NULL) {
+		/*
+		 * no valid TCB for this packet, or we found it's a bad
+		 * packet while processing control, or we're done with this
+		 * packet (done or skip rest of data), so we drop it...
+		 */
+		goto out;
+	}
+#if defined(__Userspace__)
+	if ((upcall_socket == NULL) &&
+	    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0) &&
+	    (stcb->sctp_socket != NULL)) {
+		if (stcb->sctp_socket->so_head != NULL) {
+			upcall_socket = stcb->sctp_socket->so_head;
+		} else {
+			upcall_socket = stcb->sctp_socket;
+		}
+		SOCK_LOCK(upcall_socket);
+		soref(upcall_socket);
+		SOCK_UNLOCK(upcall_socket);
+	}
+#endif
+
+	/*
+	 * DATA chunk processing
+	 */
+	/* plow through the data chunks while length > offset */
+
+	/*
+	 * Rest should be DATA only.  Check authentication state if AUTH for
+	 * DATA is required.
+	 */
+	if ((length > offset) &&
+	    (stcb != NULL) &&
+	    sctp_auth_is_required_chunk(SCTP_DATA, stcb->asoc.local_auth_chunks) &&
+	    !stcb->asoc.authenticated) {
+		/* "silently" ignore */
+		SCTP_STAT_INCR(sctps_recvauthmissing);
+		SCTPDBG(SCTP_DEBUG_AUTH1,
+			"Data chunk requires AUTH, skipped\n");
+		goto trigger_send;
+	}
+	if (length > offset) {
+		int retval;
+
+		/*
+		 * First check to make sure our state is correct. We would
+		 * not get here unless we really did have a tag, so we don't
+		 * abort if this happens, just dump the chunk silently.
+		 */
+		switch (SCTP_GET_STATE(stcb)) {
+		case SCTP_STATE_COOKIE_ECHOED:
+			/*
+			 * we consider data with valid tags in this state
+			 * shows us the cookie-ack was lost. Imply it was
+			 * there.
+			 */
+			sctp_handle_cookie_ack((struct sctp_cookie_ack_chunk *)ch, stcb, net);
+			break;
+		case SCTP_STATE_COOKIE_WAIT:
+			/*
+			 * We consider OOTB any data sent during asoc setup.
+			 */
+			SCTP_SNPRINTF(msg, sizeof(msg), "OOTB, %s:%d at %s", __FILE__, __LINE__, __func__);
+			op_err = sctp_generate_cause(SCTP_BASE_SYSCTL(sctp_diag_info_code),
+			                             msg);
+			sctp_handle_ootb(m, iphlen, offset, src, dst, sh, inp, op_err,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+			                 mflowtype, mflowid, inp->fibnum,
+#endif
+					 vrf_id, port);
+			goto out;
+			/*sa_ignore NOTREACHED*/
+			break;
+		case SCTP_STATE_EMPTY:	/* should not happen */
+		case SCTP_STATE_INUSE:	/* should not happen */
+		case SCTP_STATE_SHUTDOWN_RECEIVED:	/* This is a peer error */
+		case SCTP_STATE_SHUTDOWN_ACK_SENT:
+		default:
+			goto out;
+			/*sa_ignore NOTREACHED*/
+			break;
+		case SCTP_STATE_OPEN:
+		case SCTP_STATE_SHUTDOWN_SENT:
+			break;
+		}
+		/* plow through the data chunks while length > offset */
+		retval = sctp_process_data(mm, iphlen, &offset, length,
+		                           inp, stcb, net, &high_tsn);
+		if (retval == 2) {
+			/*
+			 * The association aborted, NO UNLOCK needed since
+			 * the association is destroyed.
+			 */
+			stcb = NULL;
+			goto out;
+		}
+		if (retval == 0) {
+			data_processed = 1;
+		}
+		/*
+		 * Anything important needs to have been m_copy'ed in
+		 * process_data
+		 */
+	}
+
+	/* take care of ecn */
+	if ((data_processed == 1) &&
+	    (stcb->asoc.ecn_supported == 1) &&
+	    ((ecn_bits & SCTP_CE_BITS) == SCTP_CE_BITS)) {
+		/* Yep, we need to add a ECNE */
+		sctp_send_ecn_echo(stcb, net, high_tsn);
+	}
+
+	if ((data_processed == 0) && (fwd_tsn_seen)) {
+		int was_a_gap;
+		uint32_t highest_tsn;
+
+		if (SCTP_TSN_GT(stcb->asoc.highest_tsn_inside_nr_map, stcb->asoc.highest_tsn_inside_map)) {
+			highest_tsn = stcb->asoc.highest_tsn_inside_nr_map;
+		} else {
+			highest_tsn = stcb->asoc.highest_tsn_inside_map;
+		}
+		was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
+		stcb->asoc.send_sack = 1;
+		sctp_sack_check(stcb, was_a_gap);
+	} else if (fwd_tsn_seen) {
+		stcb->asoc.send_sack = 1;
+	}
+	/* trigger send of any chunks in queue... */
+trigger_send:
+#ifdef SCTP_AUDITING_ENABLED
+	sctp_audit_log(0xE0, 2);
+	sctp_auditing(1, inp, stcb, net);
+#endif
+	SCTPDBG(SCTP_DEBUG_INPUT1,
+		"Check for chunk output prw:%d tqe:%d tf=%d\n",
+		stcb->asoc.peers_rwnd,
+		TAILQ_EMPTY(&stcb->asoc.control_send_queue),
+		stcb->asoc.total_flight);
+	un_sent = (stcb->asoc.total_output_queue_size - stcb->asoc.total_flight);
+	if (!TAILQ_EMPTY(&stcb->asoc.control_send_queue)) {
+		cnt_ctrl_ready = stcb->asoc.ctrl_queue_cnt - stcb->asoc.ecn_echo_cnt_onq;
+	}
+	if (!TAILQ_EMPTY(&stcb->asoc.asconf_send_queue) ||
+	    cnt_ctrl_ready ||
+	    stcb->asoc.trigger_reset ||
+	    ((un_sent > 0) &&
+	     (stcb->asoc.peers_rwnd > 0 || stcb->asoc.total_flight == 0))) {
+		SCTPDBG(SCTP_DEBUG_INPUT3, "Calling chunk OUTPUT\n");
+		sctp_chunk_output(inp, stcb, SCTP_OUTPUT_FROM_CONTROL_PROC, SCTP_SO_NOT_LOCKED);
+		SCTPDBG(SCTP_DEBUG_INPUT3, "chunk OUTPUT returns\n");
+	}
+#ifdef SCTP_AUDITING_ENABLED
+	sctp_audit_log(0xE0, 3);
+	sctp_auditing(2, inp, stcb, net);
+#endif
+ out:
+	if (stcb != NULL) {
+		SCTP_TCB_UNLOCK(stcb);
+	}
+#if defined(__Userspace__)
+	if (upcall_socket != NULL) {
+		if (upcall_socket->so_upcall != NULL) {
+			if (soreadable(upcall_socket) ||
+			    sowriteable(upcall_socket) ||
+			    upcall_socket->so_error) {
+				(*upcall_socket->so_upcall)(upcall_socket, upcall_socket->so_upcallarg, M_NOWAIT);
+			}
+		}
+		ACCEPT_LOCK();
+		SOCK_LOCK(upcall_socket);
+		sorele(upcall_socket);
+	}
+#endif
+	if (inp_decr != NULL) {
+		/* reduce ref-count */
+		SCTP_INP_WLOCK(inp_decr);
+		SCTP_INP_DECR_REF(inp_decr);
+		SCTP_INP_WUNLOCK(inp_decr);
+	}
+	return;
+}
+
+#ifdef INET
+#if !defined(__Userspace__)
+void
+sctp_input_with_port(struct mbuf *i_pak, int off, uint16_t port)
+{
+	struct mbuf *m;
+	int iphlen;
+	uint32_t vrf_id = 0;
+	uint8_t ecn_bits;
+	struct sockaddr_in src, dst;
+	struct ip *ip;
+	struct sctphdr *sh;
+	struct sctp_chunkhdr *ch;
+	int length, offset;
+	uint8_t compute_crc;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	uint32_t mflowid;
+	uint8_t mflowtype;
+	uint16_t fibnum;
+#endif
+#if defined(__Userspace__)
+	uint16_t port = 0;
+#endif
+
+	iphlen = off;
+	if (SCTP_GET_PKT_VRFID(i_pak, vrf_id)) {
+		SCTP_RELEASE_PKT(i_pak);
+		return;
+	}
+	m = SCTP_HEADER_TO_CHAIN(i_pak);
+#ifdef SCTP_MBUF_LOGGING
+	/* Log in any input mbufs */
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+		sctp_log_mbc(m, SCTP_MBUF_INPUT);
+	}
+#endif
+#ifdef SCTP_PACKET_LOGGING
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LAST_PACKET_TRACING) {
+		sctp_packet_log(m);
+	}
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+	        "sctp_input(): Packet of length %d received on %s with csum_flags 0x%b.\n",
+	        m->m_pkthdr.len,
+	        if_name(m->m_pkthdr.rcvif),
+	        (int)m->m_pkthdr.csum_flags, CSUM_BITS);
+#endif
+#if defined(__APPLE__) && !defined(__Userspace__)
+	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+	        "sctp_input(): Packet of length %d received on %s%d with csum_flags 0x%x.\n",
+	        m->m_pkthdr.len,
+	        m->m_pkthdr.rcvif->if_name,
+	        m->m_pkthdr.rcvif->if_unit,
+	        m->m_pkthdr.csum_flags);
+#endif
+#if defined(_WIN32) && !defined(__Userspace__)
+	SCTPDBG(SCTP_DEBUG_CRCOFFLOAD,
+	        "sctp_input(): Packet of length %d received on %s with csum_flags 0x%x.\n",
+	        m->m_pkthdr.len,
+	        m->m_pkthdr.rcvif->if_xname,
+	        m->m_pkthdr.csum_flags);
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	mflowid = m->m_pkthdr.flowid;
+	mflowtype = M_HASHTYPE_GET(m);
+	fibnum = M_GETFIB(m);
+#endif
+	SCTP_STAT_INCR(sctps_recvpackets);
+	SCTP_STAT_INCR_COUNTER64(sctps_inpackets);
+	/* Get IP, SCTP, and first chunk header together in the first mbuf. */
+	offset = iphlen + sizeof(struct sctphdr) + sizeof(struct sctp_chunkhdr);
+	if (SCTP_BUF_LEN(m) < offset) {
+		if ((m = m_pullup(m, offset)) == NULL) {
+			SCTP_STAT_INCR(sctps_hdrops);
+			return;
+		}
+	}
+	ip = mtod(m, struct ip *);
+	sh = (struct sctphdr *)((caddr_t)ip + iphlen);
+	ch = (struct sctp_chunkhdr *)((caddr_t)sh + sizeof(struct sctphdr));
+	offset -= sizeof(struct sctp_chunkhdr);
+	memset(&src, 0, sizeof(struct sockaddr_in));
+	src.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+	src.sin_len = sizeof(struct sockaddr_in);
+#endif
+	src.sin_port = sh->src_port;
+	src.sin_addr = ip->ip_src;
+	memset(&dst, 0, sizeof(struct sockaddr_in));
+	dst.sin_family = AF_INET;
+#ifdef HAVE_SIN_LEN
+	dst.sin_len = sizeof(struct sockaddr_in);
+#endif
+	dst.sin_port = sh->dest_port;
+	dst.sin_addr = ip->ip_dst;
+#if defined(_WIN32) && !defined(__Userspace__)
+	NTOHS(ip->ip_len);
+#endif
+#if defined(__linux__) || (defined(_WIN32) && defined(__Userspace__))
+	ip->ip_len = ntohs(ip->ip_len);
+#endif
+#if defined(__Userspace__)
+#if defined(__linux__) || defined(_WIN32)
+	length = ip->ip_len;
+#else
+	length = ip->ip_len + iphlen;
+#endif
+#elif defined(__FreeBSD__)
+	length = ntohs(ip->ip_len);
+#elif defined(__APPLE__)
+	length = ip->ip_len + iphlen;
+#else
+	length = ip->ip_len;
+#endif
+	/* Validate mbuf chain length with IP payload length. */
+	if (SCTP_HEADER_LEN(m) != length) {
+		SCTPDBG(SCTP_DEBUG_INPUT1,
+		        "sctp_input() length:%d reported length:%d\n", length, SCTP_HEADER_LEN(m));
+		SCTP_STAT_INCR(sctps_hdrops);
+		goto out;
+	}
+	/* SCTP does not allow broadcasts or multicasts */
+	if (IN_MULTICAST(ntohl(dst.sin_addr.s_addr))) {
+		goto out;
+	}
+	if (SCTP_IS_IT_BROADCAST(dst.sin_addr, m)) {
+		goto out;
+	}
+	ecn_bits = ip->ip_tos;
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	if (m->m_pkthdr.csum_flags & CSUM_SCTP_VALID) {
+		SCTP_STAT_INCR(sctps_recvhwcrc);
+		compute_crc = 0;
+	} else {
+#else
+	if (SCTP_BASE_SYSCTL(sctp_no_csum_on_loopback) &&
+	    ((src.sin_addr.s_addr == dst.sin_addr.s_addr) ||
+	     (SCTP_IS_IT_LOOPBACK(m)))) {
+		SCTP_STAT_INCR(sctps_recvhwcrc);
+		compute_crc = 0;
+	} else {
+#endif
+		SCTP_STAT_INCR(sctps_recvswcrc);
+		compute_crc = 1;
+	}
+	sctp_common_input_processing(&m, iphlen, offset, length,
+	                             (struct sockaddr *)&src,
+	                             (struct sockaddr *)&dst,
+	                             sh, ch,
+	                             compute_crc,
+	                             ecn_bits,
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	                             mflowtype, mflowid, fibnum,
+#endif
+	                             vrf_id, port);
+ out:
+	if (m) {
+		sctp_m_freem(m);
+	}
+	return;
+}
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#if defined(SCTP_MCORE_INPUT) && defined(SMP)
+extern int *sctp_cpuarry;
+#endif
+#endif
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+int
+sctp_input(struct mbuf **mp, int *offp, int proto SCTP_UNUSED)
+{
+	struct mbuf *m;
+	int off;
+
+	m = *mp;
+	off = *offp;
+#else
+void
+sctp_input(struct mbuf *m, int off)
+{
+#endif
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#if defined(SCTP_MCORE_INPUT) && defined(SMP)
+	if (mp_ncpus > 1) {
+		struct ip *ip;
+		struct sctphdr *sh;
+		int offset;
+		int cpu_to_use;
+		uint32_t flowid, tag;
+
+		if (M_HASHTYPE_GET(m) != M_HASHTYPE_NONE) {
+			flowid = m->m_pkthdr.flowid;
+		} else {
+			/* No flow id built by lower layers
+			 * fix it so we create one.
+			 */
+			offset = off + sizeof(struct sctphdr);
+			if (SCTP_BUF_LEN(m) < offset) {
+				if ((m = m_pullup(m, offset)) == NULL) {
+					SCTP_STAT_INCR(sctps_hdrops);
+					return (IPPROTO_DONE);
+				}
+			}
+			ip = mtod(m, struct ip *);
+			sh = (struct sctphdr *)((caddr_t)ip + off);
+			tag = htonl(sh->v_tag);
+			flowid = tag ^ ntohs(sh->dest_port) ^ ntohs(sh->src_port);
+			m->m_pkthdr.flowid = flowid;
+			M_HASHTYPE_SET(m, M_HASHTYPE_OPAQUE_HASH);
+		}
+		cpu_to_use = sctp_cpuarry[flowid % mp_ncpus];
+		sctp_queue_to_mcore(m, off, cpu_to_use);
+		return (IPPROTO_DONE);
+	}
+#endif
+#endif
+	sctp_input_with_port(m, off, 0);
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+	return (IPPROTO_DONE);
+#endif
+}
+#endif
+#endif