Add m-esr52 at 52.6.0

1 files changed, 5373 insertions, 0 deletions

diff --git a/netwerk/sctp/src/netinet/sctp_indata.c b/netwerk/sctp/src/netinet/sctp_indata.c
new file mode 100755
index 000000000..f697d0ced
--- /dev/null
+++ b/netwerk/sctp/src/netinet/sctp_indata.c
@@ -0,0 +1,5373 @@
+/*-
+ * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * b) Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the distribution.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef __FreeBSD__
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/sys/netinet/sctp_indata.c 280440 2015-03-24 15:05:36Z tuexen $");
+#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_indata.h>
+#include <netinet/sctp_uio.h>
+#include <netinet/sctp_timer.h>
+
+
+/*
+ * NOTES: On the outbound side of things I need to check the sack timer to
+ * see if I should generate a sack into the chunk queue (if I have data to
+ * send that is and will be sending it .. for bundling.
+ *
+ * The callback in sctp_usrreq.c will get called when the socket is read from.
+ * This will cause sctp_service_queues() to get called on the top entry in
+ * the list.
+ */
+
+void
+sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
+{
+	asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc);
+}
+
+/* Calculate what the rwnd would be */
+uint32_t
+sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc)
+{
+	uint32_t calc = 0;
+
+	/*
+	 * This is really set wrong with respect to a 1-2-m socket. Since
+	 * the sb_cc is the count that everyone as put up. When we re-write
+	 * sctp_soreceive then we will fix this so that ONLY this
+	 * associations data is taken into account.
+	 */
+	if (stcb->sctp_socket == NULL)
+		return (calc);
+
+	if (stcb->asoc.sb_cc == 0 &&
+	    asoc->size_on_reasm_queue == 0 &&
+	    asoc->size_on_all_streams == 0) {
+		/* Full rwnd granted */
+		calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND);
+		return (calc);
+	}
+	/* get actual space */
+	calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv);
+
+	/*
+	 * take out what has NOT been put on socket queue and we yet hold
+	 * for putting up.
+	 */
+	calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_reasm_queue +
+	                                         asoc->cnt_on_reasm_queue * MSIZE));
+	calc = sctp_sbspace_sub(calc, (uint32_t)(asoc->size_on_all_streams +
+	                                         asoc->cnt_on_all_streams * MSIZE));
+
+	if (calc == 0) {
+		/* out of space */
+		return (calc);
+	}
+
+	/* what is the overhead of all these rwnd's */
+	calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len);
+	/* If the window gets too small due to ctrl-stuff, reduce it
+	 * to 1, even it is 0. SWS engaged
+	 */
+	if (calc < stcb->asoc.my_rwnd_control_len) {
+		calc = 1;
+	}
+	return (calc);
+}
+
+
+
+/*
+ * Build out our readq entry based on the incoming packet.
+ */
+struct sctp_queued_to_read *
+sctp_build_readq_entry(struct sctp_tcb *stcb,
+    struct sctp_nets *net,
+    uint32_t tsn, uint32_t ppid,
+    uint32_t context, uint16_t stream_no,
+    uint16_t stream_seq, uint8_t flags,
+    struct mbuf *dm)
+{
+	struct sctp_queued_to_read *read_queue_e = NULL;
+
+	sctp_alloc_a_readq(stcb, read_queue_e);
+	if (read_queue_e == NULL) {
+		goto failed_build;
+	}
+	read_queue_e->sinfo_stream = stream_no;
+	read_queue_e->sinfo_ssn = stream_seq;
+	read_queue_e->sinfo_flags = (flags << 8);
+	read_queue_e->sinfo_ppid = ppid;
+	read_queue_e->sinfo_context = context;
+	read_queue_e->sinfo_timetolive = 0;
+	read_queue_e->sinfo_tsn = tsn;
+	read_queue_e->sinfo_cumtsn = tsn;
+	read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
+	read_queue_e->whoFrom = net;
+	read_queue_e->length = 0;
+	atomic_add_int(&net->ref_count, 1);
+	read_queue_e->data = dm;
+	read_queue_e->spec_flags = 0;
+	read_queue_e->tail_mbuf = NULL;
+	read_queue_e->aux_data = NULL;
+	read_queue_e->stcb = stcb;
+	read_queue_e->port_from = stcb->rport;
+	read_queue_e->do_not_ref_stcb = 0;
+	read_queue_e->end_added = 0;
+	read_queue_e->some_taken = 0;
+	read_queue_e->pdapi_aborted = 0;
+failed_build:
+	return (read_queue_e);
+}
+
+
+/*
+ * Build out our readq entry based on the incoming packet.
+ */
+static struct sctp_queued_to_read *
+sctp_build_readq_entry_chk(struct sctp_tcb *stcb,
+    struct sctp_tmit_chunk *chk)
+{
+	struct sctp_queued_to_read *read_queue_e = NULL;
+
+	sctp_alloc_a_readq(stcb, read_queue_e);
+	if (read_queue_e == NULL) {
+		goto failed_build;
+	}
+	read_queue_e->sinfo_stream = chk->rec.data.stream_number;
+	read_queue_e->sinfo_ssn = chk->rec.data.stream_seq;
+	read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8);
+	read_queue_e->sinfo_ppid = chk->rec.data.payloadtype;
+	read_queue_e->sinfo_context = stcb->asoc.context;
+	read_queue_e->sinfo_timetolive = 0;
+	read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq;
+	read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq;
+	read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb);
+	read_queue_e->whoFrom = chk->whoTo;
+	read_queue_e->aux_data = NULL;
+	read_queue_e->length = 0;
+	atomic_add_int(&chk->whoTo->ref_count, 1);
+	read_queue_e->data = chk->data;
+	read_queue_e->tail_mbuf = NULL;
+	read_queue_e->stcb = stcb;
+	read_queue_e->port_from = stcb->rport;
+	read_queue_e->spec_flags = 0;
+	read_queue_e->do_not_ref_stcb = 0;
+	read_queue_e->end_added = 0;
+	read_queue_e->some_taken = 0;
+	read_queue_e->pdapi_aborted = 0;
+failed_build:
+	return (read_queue_e);
+}
+
+
+struct mbuf *
+sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo)
+{
+	struct sctp_extrcvinfo *seinfo;
+	struct sctp_sndrcvinfo *outinfo;
+	struct sctp_rcvinfo *rcvinfo;
+	struct sctp_nxtinfo *nxtinfo;
+#if defined(__Userspace_os_Windows)
+	WSACMSGHDR *cmh;
+#else
+	struct cmsghdr *cmh;
+#endif
+	struct mbuf *ret;
+	int len;
+	int use_extended;
+	int provide_nxt;
+
+	if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT) &&
+	    sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVRCVINFO) &&
+	    sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVNXTINFO)) {
+		/* user does not want any ancillary data */
+		return (NULL);
+	}
+
+	len = 0;
+	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
+		len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
+	}
+	seinfo = (struct sctp_extrcvinfo *)sinfo;
+	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVNXTINFO) &&
+	    (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_AVAIL)) {
+		provide_nxt = 1;
+		len += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
+	} else {
+		provide_nxt = 0;
+	}
+	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
+		if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) {
+			use_extended = 1;
+			len += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
+		} else {
+			use_extended = 0;
+			len += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
+		}
+	} else {
+		use_extended = 0;
+	}
+
+	ret = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
+	if (ret == NULL) {
+		/* No space */
+		return (ret);
+	}
+	SCTP_BUF_LEN(ret) = 0;
+
+	/* We need a CMSG header followed by the struct */
+#if defined(__Userspace_os_Windows)
+	cmh = mtod(ret, WSACMSGHDR *);
+#else
+	cmh = mtod(ret, struct cmsghdr *);
+#endif
+	/*
+	 * Make sure that there is no un-initialized padding between
+	 * the cmsg header and cmsg data and after the cmsg data.
+	 */
+	memset(cmh, 0, len);
+	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVRCVINFO)) {
+		cmh->cmsg_level = IPPROTO_SCTP;
+		cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_rcvinfo));
+		cmh->cmsg_type = SCTP_RCVINFO;
+		rcvinfo = (struct sctp_rcvinfo *)CMSG_DATA(cmh);
+		rcvinfo->rcv_sid = sinfo->sinfo_stream;
+		rcvinfo->rcv_ssn = sinfo->sinfo_ssn;
+		rcvinfo->rcv_flags = sinfo->sinfo_flags;
+		rcvinfo->rcv_ppid = sinfo->sinfo_ppid;
+		rcvinfo->rcv_tsn = sinfo->sinfo_tsn;
+		rcvinfo->rcv_cumtsn = sinfo->sinfo_cumtsn;
+		rcvinfo->rcv_context = sinfo->sinfo_context;
+		rcvinfo->rcv_assoc_id = sinfo->sinfo_assoc_id;
+#if defined(__Userspace_os_Windows)
+		cmh = (WSACMSGHDR *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
+#else
+		cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_rcvinfo)));
+#endif
+		SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_rcvinfo));
+	}
+	if (provide_nxt) {
+		cmh->cmsg_level = IPPROTO_SCTP;
+		cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_nxtinfo));
+		cmh->cmsg_type = SCTP_NXTINFO;
+		nxtinfo = (struct sctp_nxtinfo *)CMSG_DATA(cmh);
+		nxtinfo->nxt_sid = seinfo->sreinfo_next_stream;
+		nxtinfo->nxt_flags = 0;
+		if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_UNORDERED) {
+			nxtinfo->nxt_flags |= SCTP_UNORDERED;
+		}
+		if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_IS_NOTIFICATION) {
+			nxtinfo->nxt_flags |= SCTP_NOTIFICATION;
+		}
+		if (seinfo->sreinfo_next_flags & SCTP_NEXT_MSG_ISCOMPLETE) {
+			nxtinfo->nxt_flags |= SCTP_COMPLETE;
+		}
+		nxtinfo->nxt_ppid = seinfo->sreinfo_next_ppid;
+		nxtinfo->nxt_length = seinfo->sreinfo_next_length;
+		nxtinfo->nxt_assoc_id = seinfo->sreinfo_next_aid;
+#if defined(__Userspace_os_Windows)
+		cmh = (WSACMSGHDR *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
+#else
+		cmh = (struct cmsghdr *)((caddr_t)cmh + CMSG_SPACE(sizeof(struct sctp_nxtinfo)));
+#endif
+		SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_nxtinfo));
+	}
+	if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) {
+		cmh->cmsg_level = IPPROTO_SCTP;
+		outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh);
+		if (use_extended) {
+			cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_extrcvinfo));
+			cmh->cmsg_type = SCTP_EXTRCV;
+			memcpy(outinfo, sinfo, sizeof(struct sctp_extrcvinfo));
+			SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_extrcvinfo));
+		} else {
+			cmh->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo));
+			cmh->cmsg_type = SCTP_SNDRCV;
+			*outinfo = *sinfo;
+			SCTP_BUF_LEN(ret) += CMSG_SPACE(sizeof(struct sctp_sndrcvinfo));
+		}
+	}
+	return (ret);
+}
+
+
+static void
+sctp_mark_non_revokable(struct sctp_association *asoc, uint32_t tsn)
+{
+	uint32_t gap, i, cumackp1;
+	int fnd = 0;
+
+	if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
+		return;
+	}
+	cumackp1 = asoc->cumulative_tsn + 1;
+	if (SCTP_TSN_GT(cumackp1, tsn)) {
+		/* this tsn is behind the cum ack and thus we don't
+		 * need to worry about it being moved from one to the other.
+		 */
+		return;
+	}
+	SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
+	if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
+		SCTP_PRINTF("gap:%x tsn:%x\n", gap, tsn);
+		sctp_print_mapping_array(asoc);
+#ifdef INVARIANTS
+		panic("Things are really messed up now!!");
+#endif
+	}
+	SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
+	SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
+	if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+		asoc->highest_tsn_inside_nr_map = tsn;
+	}
+	if (tsn == asoc->highest_tsn_inside_map) {
+		/* We must back down to see what the new highest is */
+		for (i = tsn - 1; SCTP_TSN_GE(i, asoc->mapping_array_base_tsn); i--) {
+			SCTP_CALC_TSN_TO_GAP(gap, i, asoc->mapping_array_base_tsn);
+			if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) {
+				asoc->highest_tsn_inside_map = i;
+				fnd = 1;
+				break;
+			}
+		}
+		if (!fnd) {
+			asoc->highest_tsn_inside_map = asoc->mapping_array_base_tsn - 1;
+		}
+	}
+}
+
+
+/*
+ * We are delivering currently from the reassembly queue. We must continue to
+ * deliver until we either: 1) run out of space. 2) run out of sequential
+ * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag.
+ */
+static void
+sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc)
+{
+	struct sctp_tmit_chunk *chk, *nchk;
+	uint16_t nxt_todel;
+	uint16_t stream_no;
+	int end = 0;
+	int cntDel;
+	struct sctp_queued_to_read *control, *ctl, *nctl;
+
+	if (stcb == NULL)
+		return;
+
+	cntDel = stream_no = 0;
+	if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
+	     (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) ||
+	     (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) {
+		/* socket above is long gone or going.. */
+	abandon:
+		asoc->fragmented_delivery_inprogress = 0;
+		TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
+			TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
+			asoc->size_on_reasm_queue -= chk->send_size;
+			sctp_ucount_decr(asoc->cnt_on_reasm_queue);
+			/*
+			 * Lose the data pointer, since its in the socket
+			 * buffer
+			 */
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			/* Now free the address and data */
+			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+			/*sa_ignore FREED_MEMORY*/
+		}
+		return;
+	}
+	SCTP_TCB_LOCK_ASSERT(stcb);
+	TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
+		if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) {
+			/* Can't deliver more :< */
+			return;
+		}
+		stream_no = chk->rec.data.stream_number;
+		nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1;
+		if (nxt_todel != chk->rec.data.stream_seq &&
+		    (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
+			/*
+			 * Not the next sequence to deliver in its stream OR
+			 * unordered
+			 */
+			return;
+		}
+		if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
+
+			control = sctp_build_readq_entry_chk(stcb, chk);
+			if (control == NULL) {
+				/* out of memory? */
+				return;
+			}
+			/* save it off for our future deliveries */
+			stcb->asoc.control_pdapi = control;
+			if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
+				end = 1;
+			else
+				end = 0;
+			sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
+			sctp_add_to_readq(stcb->sctp_ep,
+			                  stcb, control, &stcb->sctp_socket->so_rcv, end,
+			                  SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
+			cntDel++;
+		} else {
+			if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG)
+				end = 1;
+			else
+				end = 0;
+			sctp_mark_non_revokable(asoc, chk->rec.data.TSN_seq);
+			if (sctp_append_to_readq(stcb->sctp_ep, stcb,
+			    stcb->asoc.control_pdapi,
+			    chk->data, end, chk->rec.data.TSN_seq,
+			    &stcb->sctp_socket->so_rcv)) {
+				/*
+				 * something is very wrong, either
+				 * control_pdapi is NULL, or the tail_mbuf
+				 * is corrupt, or there is a EOM already on
+				 * the mbuf chain.
+				 */
+				if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) {
+					goto abandon;
+				} else {
+#ifdef INVARIANTS
+					if ((stcb->asoc.control_pdapi == NULL)  || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
+						panic("This should not happen control_pdapi NULL?");
+					}
+					/* if we did not panic, it was a EOM */
+					panic("Bad chunking ??");
+#else
+					if ((stcb->asoc.control_pdapi == NULL)  || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) {
+					  SCTP_PRINTF("This should not happen control_pdapi NULL?\n");
+					}
+					SCTP_PRINTF("Bad chunking ??\n");
+					SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n");
+
+#endif
+					goto abandon;
+				}
+			}
+			cntDel++;
+		}
+		/* pull it we did it */
+		TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
+		if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
+			asoc->fragmented_delivery_inprogress = 0;
+			if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) {
+				asoc->strmin[stream_no].last_sequence_delivered++;
+			}
+			if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
+				SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs);
+			}
+		} else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
+			/*
+			 * turn the flag back on since we just  delivered
+			 * yet another one.
+			 */
+			asoc->fragmented_delivery_inprogress = 1;
+		}
+		asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq;
+		asoc->last_flags_delivered = chk->rec.data.rcv_flags;
+		asoc->last_strm_seq_delivered = chk->rec.data.stream_seq;
+		asoc->last_strm_no_delivered = chk->rec.data.stream_number;
+
+		asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
+		asoc->size_on_reasm_queue -= chk->send_size;
+		sctp_ucount_decr(asoc->cnt_on_reasm_queue);
+		/* free up the chk */
+		chk->data = NULL;
+		sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+
+		if (asoc->fragmented_delivery_inprogress == 0) {
+			/*
+			 * Now lets see if we can deliver the next one on
+			 * the stream
+			 */
+			struct sctp_stream_in *strm;
+
+			strm = &asoc->strmin[stream_no];
+			nxt_todel = strm->last_sequence_delivered + 1;
+			TAILQ_FOREACH_SAFE(ctl, &strm->inqueue, next, nctl) {
+				/* Deliver more if we can. */
+				if (nxt_todel == ctl->sinfo_ssn) {
+					TAILQ_REMOVE(&strm->inqueue, ctl, next);
+					asoc->size_on_all_streams -= ctl->length;
+					sctp_ucount_decr(asoc->cnt_on_all_streams);
+					strm->last_sequence_delivered++;
+					sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
+					sctp_add_to_readq(stcb->sctp_ep, stcb,
+					                  ctl,
+					                  &stcb->sctp_socket->so_rcv, 1,
+					                  SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
+				} else {
+					break;
+				}
+				nxt_todel = strm->last_sequence_delivered + 1;
+			}
+			break;
+		}
+	}
+}
+
+/*
+ * Queue the chunk either right into the socket buffer if it is the next one
+ * to go OR put it in the correct place in the delivery queue.  If we do
+ * append to the so_buf, keep doing so until we are out of order. One big
+ * question still remains, what to do when the socket buffer is FULL??
+ */
+static void
+sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc,
+    struct sctp_queued_to_read *control, int *abort_flag)
+{
+	/*
+	 * FIX-ME maybe? What happens when the ssn wraps? If we are getting
+	 * all the data in one stream this could happen quite rapidly. One
+	 * could use the TSN to keep track of things, but this scheme breaks
+	 * down in the other type of stream useage that could occur. Send a
+	 * single msg to stream 0, send 4Billion messages to stream 1, now
+	 * send a message to stream 0. You have a situation where the TSN
+	 * has wrapped but not in the stream. Is this worth worrying about
+	 * or should we just change our queue sort at the bottom to be by
+	 * TSN.
+	 *
+	 * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2
+	 * with TSN 1? If the peer is doing some sort of funky TSN/SSN
+	 * assignment this could happen... and I don't see how this would be
+	 * a violation. So for now I am undecided an will leave the sort by
+	 * SSN alone. Maybe a hybred approach is the answer
+	 *
+	 */
+	struct sctp_stream_in *strm;
+	struct sctp_queued_to_read *at;
+	int queue_needed;
+	uint16_t nxt_todel;
+	struct mbuf *op_err;
+	char msg[SCTP_DIAG_INFO_LEN];
+
+	queue_needed = 1;
+	asoc->size_on_all_streams += control->length;
+	sctp_ucount_incr(asoc->cnt_on_all_streams);
+	strm = &asoc->strmin[control->sinfo_stream];
+	nxt_todel = strm->last_sequence_delivered + 1;
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+		sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD);
+	}
+	SCTPDBG(SCTP_DEBUG_INDATA1,
+		"queue to stream called for ssn:%u lastdel:%u nxt:%u\n",
+		(uint32_t) control->sinfo_stream,
+		(uint32_t) strm->last_sequence_delivered,
+		(uint32_t) nxt_todel);
+	if (SCTP_SSN_GE(strm->last_sequence_delivered, control->sinfo_ssn)) {
+		/* The incoming sseq is behind where we last delivered? */
+		SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n",
+			control->sinfo_ssn, strm->last_sequence_delivered);
+	protocol_error:
+		/*
+		 * throw it in the stream so it gets cleaned up in
+		 * association destruction
+		 */
+		TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
+		snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+		         strm->last_sequence_delivered, control->sinfo_tsn,
+			 control->sinfo_stream, control->sinfo_ssn);
+		op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+		stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_1;
+		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+		*abort_flag = 1;
+		return;
+
+	}
+	if (nxt_todel == control->sinfo_ssn) {
+		/* can be delivered right away? */
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+			sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL);
+		}
+		/* EY it wont be queued if it could be delivered directly*/
+		queue_needed = 0;
+		asoc->size_on_all_streams -= control->length;
+		sctp_ucount_decr(asoc->cnt_on_all_streams);
+		strm->last_sequence_delivered++;
+
+		sctp_mark_non_revokable(asoc, control->sinfo_tsn);
+		sctp_add_to_readq(stcb->sctp_ep, stcb,
+		                  control,
+		                  &stcb->sctp_socket->so_rcv, 1,
+		                  SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
+		TAILQ_FOREACH_SAFE(control, &strm->inqueue, next, at) {
+			/* all delivered */
+			nxt_todel = strm->last_sequence_delivered + 1;
+			if (nxt_todel == control->sinfo_ssn) {
+				TAILQ_REMOVE(&strm->inqueue, control, next);
+				asoc->size_on_all_streams -= control->length;
+				sctp_ucount_decr(asoc->cnt_on_all_streams);
+				strm->last_sequence_delivered++;
+				/*
+				 * We ignore the return of deliver_data here
+				 * since we always can hold the chunk on the
+				 * d-queue. And we have a finite number that
+				 * can be delivered from the strq.
+				 */
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+					sctp_log_strm_del(control, NULL,
+							  SCTP_STR_LOG_FROM_IMMED_DEL);
+				}
+				sctp_mark_non_revokable(asoc, control->sinfo_tsn);
+				sctp_add_to_readq(stcb->sctp_ep, stcb,
+				                  control,
+				                  &stcb->sctp_socket->so_rcv, 1,
+				                  SCTP_READ_LOCK_NOT_HELD,
+				                  SCTP_SO_NOT_LOCKED);
+				continue;
+			}
+			break;
+		}
+	}
+	if (queue_needed) {
+		/*
+		 * Ok, we did not deliver this guy, find the correct place
+		 * to put it on the queue.
+		 */
+		if (SCTP_TSN_GE(asoc->cumulative_tsn, control->sinfo_tsn)) {
+			goto protocol_error;
+		}
+		if (TAILQ_EMPTY(&strm->inqueue)) {
+			/* Empty queue */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+				sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD);
+			}
+			TAILQ_INSERT_HEAD(&strm->inqueue, control, next);
+		} else {
+			TAILQ_FOREACH(at, &strm->inqueue, next) {
+				if (SCTP_SSN_GT(at->sinfo_ssn, control->sinfo_ssn)) {
+					/*
+					 * one in queue is bigger than the
+					 * new one, insert before this one
+					 */
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+						sctp_log_strm_del(control, at,
+								  SCTP_STR_LOG_FROM_INSERT_MD);
+					}
+					TAILQ_INSERT_BEFORE(at, control, next);
+					break;
+				} else if (at->sinfo_ssn == control->sinfo_ssn) {
+					/*
+					 * Gak, He sent me a duplicate str
+					 * seq number
+					 */
+					/*
+					 * foo bar, I guess I will just free
+					 * this new guy, should we abort
+					 * too? FIX ME MAYBE? Or it COULD be
+					 * that the SSN's have wrapped.
+					 * Maybe I should compare to TSN
+					 * somehow... sigh for now just blow
+					 * away the chunk!
+					 */
+
+					if (control->data)
+						sctp_m_freem(control->data);
+					control->data = NULL;
+					asoc->size_on_all_streams -= control->length;
+					sctp_ucount_decr(asoc->cnt_on_all_streams);
+					if (control->whoFrom) {
+						sctp_free_remote_addr(control->whoFrom);
+						control->whoFrom = NULL;
+					}
+					sctp_free_a_readq(stcb, control);
+					return;
+				} else {
+					if (TAILQ_NEXT(at, next) == NULL) {
+						/*
+						 * We are at the end, insert
+						 * it after this one
+						 */
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+							sctp_log_strm_del(control, at,
+									  SCTP_STR_LOG_FROM_INSERT_TL);
+						}
+						TAILQ_INSERT_AFTER(&strm->inqueue,
+						    at, control, next);
+						break;
+					}
+				}
+			}
+		}
+	}
+}
+
+/*
+ * Returns two things: You get the total size of the deliverable parts of the
+ * first fragmented message on the reassembly queue. And you get a 1 back if
+ * all of the message is ready or a 0 back if the message is still incomplete
+ */
+static int
+sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t *t_size)
+{
+	struct sctp_tmit_chunk *chk;
+	uint32_t tsn;
+
+	*t_size = 0;
+	chk = TAILQ_FIRST(&asoc->reasmqueue);
+	if (chk == NULL) {
+		/* nothing on the queue */
+		return (0);
+	}
+	if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) {
+		/* Not a first on the queue */
+		return (0);
+	}
+	tsn = chk->rec.data.TSN_seq;
+	TAILQ_FOREACH(chk, &asoc->reasmqueue, sctp_next) {
+		if (tsn != chk->rec.data.TSN_seq) {
+			return (0);
+		}
+		*t_size += chk->send_size;
+		if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
+			return (1);
+		}
+		tsn++;
+	}
+	return (0);
+}
+
+static void
+sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc)
+{
+	struct sctp_tmit_chunk *chk;
+	uint16_t nxt_todel;
+	uint32_t tsize, pd_point;
+
+ doit_again:
+	chk = TAILQ_FIRST(&asoc->reasmqueue);
+	if (chk == NULL) {
+		/* Huh? */
+		asoc->size_on_reasm_queue = 0;
+		asoc->cnt_on_reasm_queue = 0;
+		return;
+	}
+	if (asoc->fragmented_delivery_inprogress == 0) {
+		nxt_todel =
+		    asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
+		if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
+		    (nxt_todel == chk->rec.data.stream_seq ||
+		    (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
+			/*
+			 * Yep the first one is here and its ok to deliver
+			 * but should we?
+			 */
+			if (stcb->sctp_socket) {
+				pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
+				               stcb->sctp_ep->partial_delivery_point);
+			} else {
+				pd_point = stcb->sctp_ep->partial_delivery_point;
+			}
+			if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
+				/*
+				 * Yes, we setup to start reception, by
+				 * backing down the TSN just in case we
+				 * can't deliver. If we
+				 */
+				asoc->fragmented_delivery_inprogress = 1;
+				asoc->tsn_last_delivered =
+				    chk->rec.data.TSN_seq - 1;
+				asoc->str_of_pdapi =
+				    chk->rec.data.stream_number;
+				asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
+				asoc->pdapi_ppid = chk->rec.data.payloadtype;
+				asoc->fragment_flags = chk->rec.data.rcv_flags;
+				sctp_service_reassembly(stcb, asoc);
+			}
+		}
+	} else {
+		/* Service re-assembly will deliver stream data queued
+		 * at the end of fragmented delivery.. but it wont know
+		 * to go back and call itself again... we do that here
+		 * with the got doit_again
+		 */
+		sctp_service_reassembly(stcb, asoc);
+		if (asoc->fragmented_delivery_inprogress == 0) {
+			/* finished our Fragmented delivery, could be
+			 * more waiting?
+			 */
+			goto doit_again;
+		}
+	}
+}
+
+/*
+ * Dump onto the re-assembly queue, in its proper place. After dumping on the
+ * queue, see if anthing can be delivered. If so pull it off (or as much as
+ * we can. If we run out of space then we must dump what we can and set the
+ * appropriate flag to say we queued what we could.
+ */
+static void
+sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc,
+    struct sctp_tmit_chunk *chk, int *abort_flag)
+{
+	struct mbuf *op_err;
+	char msg[SCTP_DIAG_INFO_LEN];
+	uint32_t cum_ackp1, prev_tsn, post_tsn;
+	struct sctp_tmit_chunk *at, *prev, *next;
+
+	prev = next = NULL;
+	cum_ackp1 = asoc->tsn_last_delivered + 1;
+	if (TAILQ_EMPTY(&asoc->reasmqueue)) {
+		/* This is the first one on the queue */
+		TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next);
+		/*
+		 * we do not check for delivery of anything when only one
+		 * fragment is here
+		 */
+		asoc->size_on_reasm_queue = chk->send_size;
+		sctp_ucount_incr(asoc->cnt_on_reasm_queue);
+		if (chk->rec.data.TSN_seq == cum_ackp1) {
+			if (asoc->fragmented_delivery_inprogress == 0 &&
+			    (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) !=
+			    SCTP_DATA_FIRST_FRAG) {
+				/*
+				 * An empty queue, no delivery inprogress,
+				 * we hit the next one and it does NOT have
+				 * a FIRST fragment mark.
+				 */
+				SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n");
+				snprintf(msg, sizeof(msg),
+				         "Expected B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+				         chk->rec.data.TSN_seq,
+				         chk->rec.data.stream_number,
+				         chk->rec.data.stream_seq);
+				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_2;
+				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+				*abort_flag = 1;
+			} else if (asoc->fragmented_delivery_inprogress &&
+			    (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
+				/*
+				 * We are doing a partial delivery and the
+				 * NEXT chunk MUST be either the LAST or
+				 * MIDDLE fragment NOT a FIRST
+				 */
+				SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n");
+				snprintf(msg, sizeof(msg),
+				         "Didn't expect B-bit for TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+				         chk->rec.data.TSN_seq,
+				         chk->rec.data.stream_number,
+				         chk->rec.data.stream_seq);
+				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_3;
+				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+				*abort_flag = 1;
+			} else if (asoc->fragmented_delivery_inprogress) {
+				/*
+				 * Here we are ok with a MIDDLE or LAST
+				 * piece
+				 */
+				if (chk->rec.data.stream_number !=
+				    asoc->str_of_pdapi) {
+					/* Got to be the right STR No */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n",
+						chk->rec.data.stream_number,
+						asoc->str_of_pdapi);
+					snprintf(msg, sizeof(msg),
+					         "Expected SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         asoc->str_of_pdapi,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_4;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+				} else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) !=
+					    SCTP_DATA_UNORDERED &&
+					    chk->rec.data.stream_seq != asoc->ssn_of_pdapi) {
+					/* Got to be the right STR Seq */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n",
+						chk->rec.data.stream_seq,
+						asoc->ssn_of_pdapi);
+					snprintf(msg, sizeof(msg),
+					         "Expected SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         asoc->ssn_of_pdapi,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_5;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+				}
+			}
+		}
+		return;
+	}
+	/* Find its place */
+	TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
+		if (SCTP_TSN_GT(at->rec.data.TSN_seq, chk->rec.data.TSN_seq)) {
+			/*
+			 * one in queue is bigger than the new one, insert
+			 * before this one
+			 */
+			/* A check */
+			asoc->size_on_reasm_queue += chk->send_size;
+			sctp_ucount_incr(asoc->cnt_on_reasm_queue);
+			next = at;
+			TAILQ_INSERT_BEFORE(at, chk, sctp_next);
+			break;
+		} else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) {
+			/* Gak, He sent me a duplicate str seq number */
+			/*
+			 * foo bar, I guess I will just free this new guy,
+			 * should we abort too? FIX ME MAYBE? Or it COULD be
+			 * that the SSN's have wrapped. Maybe I should
+			 * compare to TSN somehow... sigh for now just blow
+			 * away the chunk!
+			 */
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+			return;
+		} else {
+			prev = at;
+			if (TAILQ_NEXT(at, sctp_next) == NULL) {
+				/*
+				 * We are at the end, insert it after this
+				 * one
+				 */
+				/* check it first */
+				asoc->size_on_reasm_queue += chk->send_size;
+				sctp_ucount_incr(asoc->cnt_on_reasm_queue);
+				TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next);
+				break;
+			}
+		}
+	}
+	/* Now the audits */
+	if (prev) {
+		prev_tsn = chk->rec.data.TSN_seq - 1;
+		if (prev_tsn == prev->rec.data.TSN_seq) {
+			/*
+			 * Ok the one I am dropping onto the end is the
+			 * NEXT. A bit of valdiation here.
+			 */
+			if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+			    SCTP_DATA_FIRST_FRAG ||
+			    (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+			    SCTP_DATA_MIDDLE_FRAG) {
+				/*
+				 * Insert chk MUST be a MIDDLE or LAST
+				 * fragment
+				 */
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+				    SCTP_DATA_FIRST_FRAG) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n");
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n");
+					snprintf(msg, sizeof(msg),
+					         "Can't handle B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_6;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if (chk->rec.data.stream_number !=
+				    prev->rec.data.stream_number) {
+					/*
+					 * Huh, need the correct STR here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sid:%d not the same as at:%d\n",
+					        chk->rec.data.stream_number,
+					        prev->rec.data.stream_number);
+					snprintf(msg, sizeof(msg),
+					         "Expect SID=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         prev->rec.data.stream_number,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_7;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
+				    (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
+					/*
+					 * Huh, need the same ordering here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, U-bit not constant\n");
+					snprintf(msg, sizeof(msg),
+					         "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
+					         (prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
+					         chk->rec.data.TSN_seq,
+					         (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_7;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
+				    chk->rec.data.stream_seq !=
+				    prev->rec.data.stream_seq) {
+					/*
+					 * Huh, need the correct STR here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n",
+						chk->rec.data.stream_seq,
+						prev->rec.data.stream_seq);
+					snprintf(msg, sizeof(msg),
+					         "Expect SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         prev->rec.data.stream_seq,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_8;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+			} else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+			    SCTP_DATA_LAST_FRAG) {
+				/* Insert chk MUST be a FIRST */
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
+				    SCTP_DATA_FIRST_FRAG) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n");
+					snprintf(msg, sizeof(msg),
+					         "Expect B-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_9;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+			}
+		}
+	}
+	if (next) {
+		post_tsn = chk->rec.data.TSN_seq + 1;
+		if (post_tsn == next->rec.data.TSN_seq) {
+			/*
+			 * Ok the one I am inserting ahead of is my NEXT
+			 * one. A bit of valdiation here.
+			 */
+			if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) {
+				/* Insert chk MUST be a last fragment */
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK)
+				    != SCTP_DATA_LAST_FRAG) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n");
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n");
+					snprintf(msg, sizeof(msg),
+					         "Expect only E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_10;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+			} else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+				    SCTP_DATA_MIDDLE_FRAG ||
+				    (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+			    SCTP_DATA_LAST_FRAG) {
+				/*
+				 * Insert chk CAN be MIDDLE or FIRST NOT
+				 * LAST
+				 */
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) ==
+				    SCTP_DATA_LAST_FRAG) {
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n");
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n");
+					snprintf(msg, sizeof(msg),
+					         "Didn't expect E-bit, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_11;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if (chk->rec.data.stream_number !=
+				    next->rec.data.stream_number) {
+					/*
+					 * Huh, need the correct STR here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n",
+						chk->rec.data.stream_number,
+						next->rec.data.stream_number);
+					snprintf(msg, sizeof(msg),
+					         "Required SID %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         next->rec.data.stream_number,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_12;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) !=
+				    (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED)) {
+					/*
+					 * Huh, need the same ordering here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Next check - Gak, Evil plot, U-bit not constant\n");
+					snprintf(msg, sizeof(msg),
+					         "Expect U-bit=%d for TSN=%8.8x, got U-bit=%d",
+					         (next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0,
+					         chk->rec.data.TSN_seq,
+					         (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) ? 1 : 0);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_12;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+				if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 &&
+				    chk->rec.data.stream_seq !=
+				    next->rec.data.stream_seq) {
+					/*
+					 * Huh, need the correct STR here,
+					 * they must be the same.
+					 */
+					SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n",
+						chk->rec.data.stream_seq,
+						next->rec.data.stream_seq);
+					snprintf(msg, sizeof(msg),
+					         "Required SSN %4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         next->rec.data.stream_seq,
+					         chk->rec.data.TSN_seq,
+					         chk->rec.data.stream_number,
+					         chk->rec.data.stream_seq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_13;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					return;
+				}
+			}
+		}
+	}
+	/* Do we need to do some delivery? check */
+	sctp_deliver_reasm_check(stcb, asoc);
+}
+
+/*
+ * This is an unfortunate routine. It checks to make sure a evil guy is not
+ * stuffing us full of bad packet fragments. A broken peer could also do this
+ * but this is doubtful. It is to bad I must worry about evil crackers sigh
+ * :< more cycles.
+ */
+static int
+sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc,
+    uint32_t TSN_seq)
+{
+	struct sctp_tmit_chunk *at;
+	uint32_t tsn_est;
+
+	TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) {
+		if (SCTP_TSN_GT(TSN_seq, at->rec.data.TSN_seq)) {
+			/* is it one bigger? */
+			tsn_est = at->rec.data.TSN_seq + 1;
+			if (tsn_est == TSN_seq) {
+				/* yep. It better be a last then */
+				if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
+				    SCTP_DATA_LAST_FRAG) {
+					/*
+					 * Ok this guy belongs next to a guy
+					 * that is NOT last, it should be a
+					 * middle/last, not a complete
+					 * chunk.
+					 */
+					return (1);
+				} else {
+					/*
+					 * This guy is ok since its a LAST
+					 * and the new chunk is a fully
+					 * self- contained one.
+					 */
+					return (0);
+				}
+			}
+		} else if (TSN_seq == at->rec.data.TSN_seq) {
+			/* Software error since I have a dup? */
+			return (1);
+		} else {
+			/*
+			 * Ok, 'at' is larger than new chunk but does it
+			 * need to be right before it.
+			 */
+			tsn_est = TSN_seq + 1;
+			if (tsn_est == at->rec.data.TSN_seq) {
+				/* Yep, It better be a first */
+				if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) !=
+				    SCTP_DATA_FIRST_FRAG) {
+					return (1);
+				} else {
+					return (0);
+				}
+			}
+		}
+	}
+	return (0);
+}
+
+static int
+sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc,
+    struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length,
+    struct sctp_nets *net, uint32_t *high_tsn, int *abort_flag,
+    int *break_flag, int last_chunk)
+{
+	/* Process a data chunk */
+	/* struct sctp_tmit_chunk *chk; */
+	struct sctp_tmit_chunk *chk;
+	uint32_t tsn, gap;
+	struct mbuf *dmbuf;
+	int the_len;
+	int need_reasm_check = 0;
+	uint16_t strmno, strmseq;
+	struct mbuf *op_err;
+	char msg[SCTP_DIAG_INFO_LEN];
+	struct sctp_queued_to_read *control;
+	int ordered;
+	uint32_t protocol_id;
+	uint8_t chunk_flags;
+	struct sctp_stream_reset_list *liste;
+
+	chk = NULL;
+	tsn = ntohl(ch->dp.tsn);
+	chunk_flags = ch->ch.chunk_flags;
+	if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) {
+		asoc->send_sack = 1;
+	}
+	protocol_id = ch->dp.protocol_id;
+	ordered = ((chunk_flags & SCTP_DATA_UNORDERED) == 0);
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+		sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS);
+	}
+	if (stcb == NULL) {
+		return (0);
+	}
+	SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn);
+	if (SCTP_TSN_GE(asoc->cumulative_tsn, tsn)) {
+		/* It is a duplicate */
+		SCTP_STAT_INCR(sctps_recvdupdata);
+		if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
+			/* Record a dup for the next outbound sack */
+			asoc->dup_tsns[asoc->numduptsns] = tsn;
+			asoc->numduptsns++;
+		}
+		asoc->send_sack = 1;
+		return (0);
+	}
+	/* Calculate the number of TSN's between the base and this TSN */
+	SCTP_CALC_TSN_TO_GAP(gap, tsn, asoc->mapping_array_base_tsn);
+	if (gap >= (SCTP_MAPPING_ARRAY << 3)) {
+		/* Can't hold the bit in the mapping at max array, toss it */
+		return (0);
+	}
+	if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) {
+		SCTP_TCB_LOCK_ASSERT(stcb);
+		if (sctp_expand_mapping_array(asoc, gap)) {
+			/* Can't expand, drop it */
+			return (0);
+		}
+	}
+	if (SCTP_TSN_GT(tsn, *high_tsn)) {
+		*high_tsn = tsn;
+	}
+	/* See if we have received this one already */
+	if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap) ||
+	    SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, gap)) {
+		SCTP_STAT_INCR(sctps_recvdupdata);
+		if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) {
+			/* Record a dup for the next outbound sack */
+			asoc->dup_tsns[asoc->numduptsns] = tsn;
+			asoc->numduptsns++;
+		}
+		asoc->send_sack = 1;
+		return (0);
+	}
+	/*
+	 * Check to see about the GONE flag, duplicates would cause a sack
+	 * to be sent up above
+	 */
+	if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) ||
+	     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) ||
+	     (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET))) {
+		/*
+		 * wait a minute, this guy is gone, there is no longer a
+		 * receiver. Send peer an ABORT!
+		 */
+		op_err = sctp_generate_cause(SCTP_CAUSE_OUT_OF_RESC, "");
+		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+		*abort_flag = 1;
+		return (0);
+	}
+	/*
+	 * Now before going further we see if there is room. If NOT then we
+	 * MAY let one through only IF this TSN is the one we are waiting
+	 * for on a partial delivery API.
+	 */
+
+	/* now do the tests */
+	if (((asoc->cnt_on_all_streams +
+	      asoc->cnt_on_reasm_queue +
+	      asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) ||
+	    (((int)asoc->my_rwnd) <= 0)) {
+		/*
+		 * When we have NO room in the rwnd we check to make sure
+		 * the reader is doing its job...
+		 */
+		if (stcb->sctp_socket->so_rcv.sb_cc) {
+			/* some to read, wake-up */
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+			struct socket *so;
+
+			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 (0);
+			}
+#endif
+			sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+			SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+		}
+		/* now is it in the mapping array of what we have accepted? */
+		if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map) &&
+		    SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+			/* Nope not in the valid range dump it */
+			sctp_set_rwnd(stcb, asoc);
+			if ((asoc->cnt_on_all_streams +
+			     asoc->cnt_on_reasm_queue +
+			     asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) {
+				SCTP_STAT_INCR(sctps_datadropchklmt);
+			} else {
+				SCTP_STAT_INCR(sctps_datadroprwnd);
+			}
+			*break_flag = 1;
+			return (0);
+		}
+	}
+	strmno = ntohs(ch->dp.stream_id);
+	if (strmno >= asoc->streamincnt) {
+		struct sctp_paramhdr *phdr;
+		struct mbuf *mb;
+
+		mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2),
+					   0, M_NOWAIT, 1, MT_DATA);
+		if (mb != NULL) {
+			/* add some space up front so prepend will work well */
+			SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr));
+			phdr = mtod(mb, struct sctp_paramhdr *);
+			/*
+			 * Error causes are just param's and this one has
+			 * two back to back phdr, one with the error type
+			 * and size, the other with the streamid and a rsvd
+			 */
+			SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2);
+			phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM);
+			phdr->param_length =
+			    htons(sizeof(struct sctp_paramhdr) * 2);
+			phdr++;
+			/* We insert the stream in the type field */
+			phdr->param_type = ch->dp.stream_id;
+			/* And set the length to 0 for the rsvd field */
+			phdr->param_length = 0;
+			sctp_queue_op_err(stcb, mb);
+		}
+		SCTP_STAT_INCR(sctps_badsid);
+		SCTP_TCB_LOCK_ASSERT(stcb);
+		SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
+		if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+			asoc->highest_tsn_inside_nr_map = tsn;
+		}
+		if (tsn == (asoc->cumulative_tsn + 1)) {
+			/* Update cum-ack */
+			asoc->cumulative_tsn = tsn;
+		}
+		return (0);
+	}
+	/*
+	 * Before we continue lets validate that we are not being fooled by
+	 * an evil attacker. We can only have 4k chunks based on our TSN
+	 * spread allowed by the mapping array 512 * 8 bits, so there is no
+	 * way our stream sequence numbers could have wrapped. We of course
+	 * only validate the FIRST fragment so the bit must be set.
+	 */
+	strmseq = ntohs(ch->dp.stream_sequence);
+#ifdef SCTP_ASOCLOG_OF_TSNS
+	SCTP_TCB_LOCK_ASSERT(stcb);
+	if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) {
+		asoc->tsn_in_at = 0;
+		asoc->tsn_in_wrapped = 1;
+	}
+	asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn;
+	asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno;
+	asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq;
+	asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length;
+	asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags;
+	asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb;
+	asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at;
+	asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1;
+	asoc->tsn_in_at++;
+#endif
+	if ((chunk_flags & SCTP_DATA_FIRST_FRAG) &&
+	    (TAILQ_EMPTY(&asoc->resetHead)) &&
+	    (chunk_flags & SCTP_DATA_UNORDERED) == 0 &&
+	    SCTP_SSN_GE(asoc->strmin[strmno].last_sequence_delivered, strmseq)) {
+		/* The incoming sseq is behind where we last delivered? */
+		SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n",
+			strmseq, asoc->strmin[strmno].last_sequence_delivered);
+
+		snprintf(msg, sizeof(msg), "Delivered SSN=%4.4x, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+		         asoc->strmin[strmno].last_sequence_delivered,
+		         tsn, strmno, strmseq);
+		op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+		stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_14;
+		sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+		*abort_flag = 1;
+		return (0);
+	}
+	/************************************
+	 * From here down we may find ch-> invalid
+	 * so its a good idea NOT to use it.
+	 *************************************/
+
+	the_len = (chk_length - sizeof(struct sctp_data_chunk));
+	if (last_chunk == 0) {
+		dmbuf = SCTP_M_COPYM(*m,
+				     (offset + sizeof(struct sctp_data_chunk)),
+				     the_len, M_NOWAIT);
+#ifdef SCTP_MBUF_LOGGING
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+			sctp_log_mbc(dmbuf, SCTP_MBUF_ICOPY);
+		}
+#endif
+	} else {
+		/* We can steal the last chunk */
+		int l_len;
+		dmbuf = *m;
+		/* lop off the top part */
+		m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk)));
+		if (SCTP_BUF_NEXT(dmbuf) == NULL) {
+			l_len = SCTP_BUF_LEN(dmbuf);
+		} else {
+			/* need to count up the size hopefully
+			 * does not hit this to often :-0
+			 */
+			struct mbuf *lat;
+
+			l_len = 0;
+			for (lat = dmbuf; lat; lat = SCTP_BUF_NEXT(lat)) {
+				l_len += SCTP_BUF_LEN(lat);
+			}
+		}
+		if (l_len > the_len) {
+			/* Trim the end round bytes off  too */
+			m_adj(dmbuf, -(l_len - the_len));
+		}
+	}
+	if (dmbuf == NULL) {
+		SCTP_STAT_INCR(sctps_nomem);
+		return (0);
+	}
+	if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG &&
+	    asoc->fragmented_delivery_inprogress == 0 &&
+	    TAILQ_EMPTY(&asoc->resetHead) &&
+	    ((ordered == 0) ||
+	    ((uint16_t)(asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq &&
+	    TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) {
+		/* Candidate for express delivery */
+		/*
+		 * Its not fragmented, No PD-API is up, Nothing in the
+		 * delivery queue, Its un-ordered OR ordered and the next to
+		 * deliver AND nothing else is stuck on the stream queue,
+		 * And there is room for it in the socket buffer. Lets just
+		 * stuff it up the buffer....
+		 */
+
+		/* It would be nice to avoid this copy if we could :< */
+		sctp_alloc_a_readq(stcb, control);
+		sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
+					   protocol_id,
+					   strmno, strmseq,
+					   chunk_flags,
+					   dmbuf);
+		if (control == NULL) {
+			goto failed_express_del;
+		}
+		SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
+		if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+			asoc->highest_tsn_inside_nr_map = tsn;
+		}
+		sctp_add_to_readq(stcb->sctp_ep, stcb,
+		                  control, &stcb->sctp_socket->so_rcv,
+		                  1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
+
+		if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
+			/* for ordered, bump what we delivered */
+			asoc->strmin[strmno].last_sequence_delivered++;
+		}
+		SCTP_STAT_INCR(sctps_recvexpress);
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+			sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno,
+					      SCTP_STR_LOG_FROM_EXPRS_DEL);
+		}
+		control = NULL;
+
+		goto finish_express_del;
+	}
+failed_express_del:
+	/* If we reach here this is a new chunk */
+	chk = NULL;
+	control = NULL;
+	/* Express for fragmented delivery? */
+	if ((asoc->fragmented_delivery_inprogress) &&
+	    (stcb->asoc.control_pdapi) &&
+	    (asoc->str_of_pdapi == strmno) &&
+	    (asoc->ssn_of_pdapi == strmseq)
+		) {
+		control = stcb->asoc.control_pdapi;
+		if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) {
+			/* Can't be another first? */
+			goto failed_pdapi_express_del;
+		}
+		if (tsn == (control->sinfo_tsn + 1)) {
+			/* Yep, we can add it on */
+			int end = 0;
+
+			if (chunk_flags & SCTP_DATA_LAST_FRAG) {
+				end = 1;
+			}
+			if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end,
+			                         tsn,
+			                         &stcb->sctp_socket->so_rcv)) {
+				SCTP_PRINTF("Append fails end:%d\n", end);
+				goto failed_pdapi_express_del;
+			}
+
+			SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
+			if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+				asoc->highest_tsn_inside_nr_map = tsn;
+			}
+			SCTP_STAT_INCR(sctps_recvexpressm);
+			asoc->tsn_last_delivered = tsn;
+			asoc->fragment_flags = chunk_flags;
+			asoc->tsn_of_pdapi_last_delivered = tsn;
+			asoc->last_flags_delivered = chunk_flags;
+			asoc->last_strm_seq_delivered = strmseq;
+			asoc->last_strm_no_delivered = strmno;
+			if (end) {
+				/* clean up the flags and such */
+				asoc->fragmented_delivery_inprogress = 0;
+				if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) {
+					asoc->strmin[strmno].last_sequence_delivered++;
+				}
+				stcb->asoc.control_pdapi = NULL;
+				if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) {
+					/* There could be another message ready */
+					need_reasm_check = 1;
+				}
+			}
+			control = NULL;
+			goto finish_express_del;
+		}
+	}
+ failed_pdapi_express_del:
+	control = NULL;
+	if (SCTP_BASE_SYSCTL(sctp_do_drain) == 0) {
+		SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap);
+		if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_nr_map)) {
+			asoc->highest_tsn_inside_nr_map = tsn;
+		}
+	} else {
+		SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap);
+		if (SCTP_TSN_GT(tsn, asoc->highest_tsn_inside_map)) {
+			asoc->highest_tsn_inside_map = tsn;
+		}
+	}
+	if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) {
+		sctp_alloc_a_chunk(stcb, chk);
+		if (chk == NULL) {
+			/* No memory so we drop the chunk */
+			SCTP_STAT_INCR(sctps_nomem);
+			if (last_chunk == 0) {
+				/* we copied it, free the copy */
+				sctp_m_freem(dmbuf);
+			}
+			return (0);
+		}
+		chk->rec.data.TSN_seq = tsn;
+		chk->no_fr_allowed = 0;
+		chk->rec.data.stream_seq = strmseq;
+		chk->rec.data.stream_number = strmno;
+		chk->rec.data.payloadtype = protocol_id;
+		chk->rec.data.context = stcb->asoc.context;
+		chk->rec.data.doing_fast_retransmit = 0;
+		chk->rec.data.rcv_flags = chunk_flags;
+		chk->asoc = asoc;
+		chk->send_size = the_len;
+		chk->whoTo = net;
+		atomic_add_int(&net->ref_count, 1);
+		chk->data = dmbuf;
+	} else {
+		sctp_alloc_a_readq(stcb, control);
+		sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn,
+		    protocol_id,
+		    strmno, strmseq,
+		    chunk_flags,
+		    dmbuf);
+		if (control == NULL) {
+			/* No memory so we drop the chunk */
+			SCTP_STAT_INCR(sctps_nomem);
+			if (last_chunk == 0) {
+				/* we copied it, free the copy */
+				sctp_m_freem(dmbuf);
+			}
+			return (0);
+		}
+		control->length = the_len;
+	}
+
+	/* Mark it as received */
+	/* Now queue it where it belongs */
+	if (control != NULL) {
+		/* First a sanity check */
+		if (asoc->fragmented_delivery_inprogress) {
+			/*
+			 * Ok, we have a fragmented delivery in progress if
+			 * this chunk is next to deliver OR belongs in our
+			 * view to the reassembly, the peer is evil or
+			 * broken.
+			 */
+			uint32_t estimate_tsn;
+
+			estimate_tsn = asoc->tsn_last_delivered + 1;
+			if (TAILQ_EMPTY(&asoc->reasmqueue) &&
+			    (estimate_tsn == control->sinfo_tsn)) {
+				/* Evil/Broke peer */
+				sctp_m_freem(control->data);
+				control->data = NULL;
+				if (control->whoFrom) {
+					sctp_free_remote_addr(control->whoFrom);
+					control->whoFrom = NULL;
+				}
+				sctp_free_a_readq(stcb, control);
+				snprintf(msg, sizeof(msg), "Reas. queue emtpy, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+				         tsn, strmno, strmseq);
+				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_15;
+				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+				*abort_flag = 1;
+				if (last_chunk) {
+					*m = NULL;
+				}
+				return (0);
+			} else {
+				if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
+					sctp_m_freem(control->data);
+					control->data = NULL;
+					if (control->whoFrom) {
+						sctp_free_remote_addr(control->whoFrom);
+						control->whoFrom = NULL;
+					}
+					sctp_free_a_readq(stcb, control);
+					snprintf(msg, sizeof(msg), "PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         tsn, strmno, strmseq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_16;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					if (last_chunk) {
+						*m = NULL;
+					}
+					return (0);
+				}
+			}
+		} else {
+			/* No PDAPI running */
+			if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
+				/*
+				 * Reassembly queue is NOT empty validate
+				 * that this tsn does not need to be in
+				 * reasembly queue. If it does then our peer
+				 * is broken or evil.
+				 */
+				if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
+					sctp_m_freem(control->data);
+					control->data = NULL;
+					if (control->whoFrom) {
+						sctp_free_remote_addr(control->whoFrom);
+						control->whoFrom = NULL;
+					}
+					sctp_free_a_readq(stcb, control);
+					snprintf(msg, sizeof(msg), "No PD ongoing, got TSN=%8.8x, SID=%4.4x, SSN=%4.4x",
+					         tsn, strmno, strmseq);
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_17;
+					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+					*abort_flag = 1;
+					if (last_chunk) {
+						*m = NULL;
+					}
+					return (0);
+				}
+			}
+		}
+		/* ok, if we reach here we have passed the sanity checks */
+		if (chunk_flags & SCTP_DATA_UNORDERED) {
+			/* queue directly into socket buffer */
+			sctp_mark_non_revokable(asoc, control->sinfo_tsn);
+			sctp_add_to_readq(stcb->sctp_ep, stcb,
+			                  control,
+			                  &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_NOT_HELD, SCTP_SO_NOT_LOCKED);
+		} else {
+			/*
+			 * Special check for when streams are resetting. We
+			 * could be more smart about this and check the
+			 * actual stream to see if it is not being reset..
+			 * that way we would not create a HOLB when amongst
+			 * streams being reset and those not being reset.
+			 *
+			 * We take complete messages that have a stream reset
+			 * intervening (aka the TSN is after where our
+			 * cum-ack needs to be) off and put them on a
+			 * pending_reply_queue. The reassembly ones we do
+			 * not have to worry about since they are all sorted
+			 * and proceessed by TSN order. It is only the
+			 * singletons I must worry about.
+			 */
+			if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
+			    SCTP_TSN_GT(tsn, liste->tsn)) {
+				/*
+				 * yep its past where we need to reset... go
+				 * ahead and queue it.
+				 */
+				if (TAILQ_EMPTY(&asoc->pending_reply_queue)) {
+					/* first one on */
+					TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
+				} else {
+					struct sctp_queued_to_read *ctlOn, *nctlOn;
+					unsigned char inserted = 0;
+
+					TAILQ_FOREACH_SAFE(ctlOn, &asoc->pending_reply_queue, next, nctlOn) {
+						if (SCTP_TSN_GT(control->sinfo_tsn, ctlOn->sinfo_tsn)) {
+							continue;
+						} else {
+							/* found it */
+							TAILQ_INSERT_BEFORE(ctlOn, control, next);
+							inserted = 1;
+							break;
+						}
+					}
+					if (inserted == 0) {
+						/*
+						 * must be put at end, use
+						 * prevP (all setup from
+						 * loop) to setup nextP.
+						 */
+						TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next);
+					}
+				}
+			} else {
+				sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
+				if (*abort_flag) {
+					if (last_chunk) {
+						*m = NULL;
+					}
+					return (0);
+				}
+			}
+		}
+	} else {
+		/* Into the re-assembly queue */
+		sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag);
+		if (*abort_flag) {
+			/*
+			 * the assoc is now gone and chk was put onto the
+			 * reasm queue, which has all been freed.
+			 */
+			if (last_chunk) {
+				*m = NULL;
+			}
+			return (0);
+		}
+	}
+finish_express_del:
+	if (tsn == (asoc->cumulative_tsn + 1)) {
+		/* Update cum-ack */
+		asoc->cumulative_tsn = tsn;
+	}
+	if (last_chunk) {
+		*m = NULL;
+	}
+	if (ordered) {
+		SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks);
+	} else {
+		SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks);
+	}
+	SCTP_STAT_INCR(sctps_recvdata);
+	/* Set it present please */
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) {
+		sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN);
+	}
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+		sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn,
+			     asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE);
+	}
+	/* check the special flag for stream resets */
+	if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) &&
+	    SCTP_TSN_GE(asoc->cumulative_tsn, liste->tsn)) {
+		/*
+		 * we have finished working through the backlogged TSN's now
+		 * time to reset streams. 1: call reset function. 2: free
+		 * pending_reply space 3: distribute any chunks in
+		 * pending_reply_queue.
+		 */
+		struct sctp_queued_to_read *ctl, *nctl;
+
+		sctp_reset_in_stream(stcb, liste->number_entries, liste->list_of_streams);
+		TAILQ_REMOVE(&asoc->resetHead, liste, next_resp);
+		SCTP_FREE(liste, SCTP_M_STRESET);
+		/*sa_ignore FREED_MEMORY*/
+		liste = TAILQ_FIRST(&asoc->resetHead);
+		if (TAILQ_EMPTY(&asoc->resetHead)) {
+			/* All can be removed */
+			TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
+				TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
+				sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
+				if (*abort_flag) {
+					return (0);
+				}
+			}
+		} else {
+			TAILQ_FOREACH_SAFE(ctl, &asoc->pending_reply_queue, next, nctl) {
+				if (SCTP_TSN_GT(ctl->sinfo_tsn, liste->tsn)) {
+					break;
+				}
+				/*
+				 * if ctl->sinfo_tsn is <= liste->tsn we can
+				 * process it which is the NOT of
+				 * ctl->sinfo_tsn > liste->tsn
+				 */
+				TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next);
+				sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag);
+				if (*abort_flag) {
+					return (0);
+				}
+			}
+		}
+		/*
+		 * Now service re-assembly to pick up anything that has been
+		 * held on reassembly queue?
+		 */
+		sctp_deliver_reasm_check(stcb, asoc);
+		need_reasm_check = 0;
+	}
+
+	if (need_reasm_check) {
+		/* Another one waits ? */
+		sctp_deliver_reasm_check(stcb, asoc);
+	}
+	return (1);
+}
+
+int8_t sctp_map_lookup_tab[256] = {
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 5,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 6,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 5,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 7,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 5,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 6,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 5,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 4,
+  0, 1, 0, 2, 0, 1, 0, 3,
+  0, 1, 0, 2, 0, 1, 0, 8
+};
+
+
+void
+sctp_slide_mapping_arrays(struct sctp_tcb *stcb)
+{
+	/*
+	 * Now we also need to check the mapping array in a couple of ways.
+	 * 1) Did we move the cum-ack point?
+	 *
+	 * When you first glance at this you might think
+	 * that all entries that make up the postion
+	 * of the cum-ack would be in the nr-mapping array
+	 * only.. i.e. things up to the cum-ack are always
+	 * deliverable. Thats true with one exception, when
+	 * its a fragmented message we may not deliver the data
+	 * until some threshold (or all of it) is in place. So
+	 * we must OR the nr_mapping_array and mapping_array to
+	 * get a true picture of the cum-ack.
+	 */
+	struct sctp_association *asoc;
+	int at;
+	uint8_t val;
+	int slide_from, slide_end, lgap, distance;
+	uint32_t old_cumack, old_base, old_highest, highest_tsn;
+
+	asoc = &stcb->asoc;
+
+	old_cumack = asoc->cumulative_tsn;
+	old_base = asoc->mapping_array_base_tsn;
+	old_highest = asoc->highest_tsn_inside_map;
+	/*
+	 * We could probably improve this a small bit by calculating the
+	 * offset of the current cum-ack as the starting point.
+	 */
+	at = 0;
+	for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) {
+		val = asoc->nr_mapping_array[slide_from] | asoc->mapping_array[slide_from];
+		if (val == 0xff) {
+			at += 8;
+		} else {
+			/* there is a 0 bit */
+			at += sctp_map_lookup_tab[val];
+			break;
+		}
+	}
+	asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at-1);
+
+	if (SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_map) &&
+            SCTP_TSN_GT(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map)) {
+#ifdef INVARIANTS
+		panic("huh, cumack 0x%x greater than high-tsn 0x%x in map",
+		      asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
+#else
+		SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n",
+			    asoc->cumulative_tsn, asoc->highest_tsn_inside_map);
+		sctp_print_mapping_array(asoc);
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+			sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+		}
+		asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
+		asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn;
+#endif
+	}
+	if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
+		highest_tsn = asoc->highest_tsn_inside_nr_map;
+	} else {
+		highest_tsn = asoc->highest_tsn_inside_map;
+	}
+	if ((asoc->cumulative_tsn == highest_tsn) && (at >= 8)) {
+		/* The complete array was completed by a single FR */
+		/* highest becomes the cum-ack */
+		int clr;
+#ifdef INVARIANTS
+		unsigned int i;
+#endif
+
+		/* clear the array */
+		clr = ((at+7) >> 3);
+		if (clr > asoc->mapping_array_size) {
+			clr = asoc->mapping_array_size;
+		}
+		memset(asoc->mapping_array, 0, clr);
+		memset(asoc->nr_mapping_array, 0, clr);
+#ifdef INVARIANTS
+		for (i = 0; i < asoc->mapping_array_size; i++) {
+			if ((asoc->mapping_array[i]) || (asoc->nr_mapping_array[i])) {
+				SCTP_PRINTF("Error Mapping array's not clean at clear\n");
+				sctp_print_mapping_array(asoc);
+			}
+		}
+#endif
+		asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1;
+		asoc->highest_tsn_inside_nr_map = asoc->highest_tsn_inside_map = asoc->cumulative_tsn;
+	} else if (at >= 8) {
+		/* we can slide the mapping array down */
+		/* slide_from holds where we hit the first NON 0xff byte */
+
+		/*
+		 * now calculate the ceiling of the move using our highest
+		 * TSN value
+		 */
+		SCTP_CALC_TSN_TO_GAP(lgap, highest_tsn, asoc->mapping_array_base_tsn);
+		slide_end = (lgap >> 3);
+		if (slide_end < slide_from) {
+			sctp_print_mapping_array(asoc);
+#ifdef INVARIANTS
+			panic("impossible slide");
+#else
+			SCTP_PRINTF("impossible slide lgap:%x slide_end:%x slide_from:%x? at:%d\n",
+			            lgap, slide_end, slide_from, at);
+			return;
+#endif
+		}
+		if (slide_end > asoc->mapping_array_size) {
+#ifdef INVARIANTS
+			panic("would overrun buffer");
+#else
+			SCTP_PRINTF("Gak, would have overrun map end:%d slide_end:%d\n",
+			            asoc->mapping_array_size, slide_end);
+			slide_end = asoc->mapping_array_size;
+#endif
+		}
+		distance = (slide_end - slide_from) + 1;
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+			sctp_log_map(old_base, old_cumack, old_highest,
+				     SCTP_MAP_PREPARE_SLIDE);
+			sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end,
+				     (uint32_t) lgap, SCTP_MAP_SLIDE_FROM);
+		}
+		if (distance + slide_from > asoc->mapping_array_size ||
+		    distance < 0) {
+			/*
+			 * Here we do NOT slide forward the array so that
+			 * hopefully when more data comes in to fill it up
+			 * we will be able to slide it forward. Really I
+			 * don't think this should happen :-0
+			 */
+
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+				sctp_log_map((uint32_t) distance, (uint32_t) slide_from,
+					     (uint32_t) asoc->mapping_array_size,
+					     SCTP_MAP_SLIDE_NONE);
+			}
+		} else {
+			int ii;
+
+			for (ii = 0; ii < distance; ii++) {
+				asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii];
+				asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[slide_from + ii];
+
+			}
+			for (ii = distance; ii < asoc->mapping_array_size; ii++) {
+				asoc->mapping_array[ii] = 0;
+				asoc->nr_mapping_array[ii] = 0;
+			}
+			if (asoc->highest_tsn_inside_map + 1 == asoc->mapping_array_base_tsn) {
+				asoc->highest_tsn_inside_map += (slide_from << 3);
+			}
+			if (asoc->highest_tsn_inside_nr_map + 1 == asoc->mapping_array_base_tsn) {
+				asoc->highest_tsn_inside_nr_map += (slide_from << 3);
+			}
+			asoc->mapping_array_base_tsn += (slide_from << 3);
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+				sctp_log_map(asoc->mapping_array_base_tsn,
+					     asoc->cumulative_tsn, asoc->highest_tsn_inside_map,
+					     SCTP_MAP_SLIDE_RESULT);
+			}
+		}
+	}
+}
+
+void
+sctp_sack_check(struct sctp_tcb *stcb, int was_a_gap)
+{
+	struct sctp_association *asoc;
+	uint32_t highest_tsn;
+
+	asoc = &stcb->asoc;
+	if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
+		highest_tsn = asoc->highest_tsn_inside_nr_map;
+	} else {
+		highest_tsn = asoc->highest_tsn_inside_map;
+	}
+
+	/*
+	 * Now we need to see if we need to queue a sack or just start the
+	 * timer (if allowed).
+	 */
+	if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
+		/*
+		 * Ok special case, in SHUTDOWN-SENT case. here we
+		 * maker sure SACK timer is off and instead send a
+		 * SHUTDOWN and a SACK
+		 */
+		if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
+			sctp_timer_stop(SCTP_TIMER_TYPE_RECV,
+			                stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA+SCTP_LOC_18);
+		}
+		sctp_send_shutdown(stcb,
+				   ((stcb->asoc.alternate) ? stcb->asoc.alternate : stcb->asoc.primary_destination));
+		sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
+	} else {
+		int is_a_gap;
+
+		/* is there a gap now ? */
+		is_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
+
+		/*
+		 * CMT DAC algorithm: increase number of packets
+		 * received since last ack
+		 */
+		stcb->asoc.cmt_dac_pkts_rcvd++;
+
+		if ((stcb->asoc.send_sack == 1) ||      /* We need to send a SACK */
+		    ((was_a_gap) && (is_a_gap == 0)) ||	/* was a gap, but no
+		                                         * longer is one */
+		    (stcb->asoc.numduptsns) ||          /* we have dup's */
+		    (is_a_gap) ||                       /* is still a gap */
+		    (stcb->asoc.delayed_ack == 0) ||    /* Delayed sack disabled */
+		    (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq)	/* hit limit of pkts */
+			) {
+
+			if ((stcb->asoc.sctp_cmt_on_off > 0) &&
+			    (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) &&
+			    (stcb->asoc.send_sack == 0) &&
+			    (stcb->asoc.numduptsns == 0) &&
+			    (stcb->asoc.delayed_ack) &&
+			    (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) {
+
+				/*
+				 * CMT DAC algorithm: With CMT,
+				 * delay acks even in the face of
+
+				 * reordering. Therefore, if acks
+				 * that do not have to be sent
+				 * because of the above reasons,
+				 * will be delayed. That is, acks
+				 * that would have been sent due to
+				 * gap reports will be delayed with
+				 * DAC. Start the delayed ack timer.
+				 */
+				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
+				                 stcb->sctp_ep, stcb, NULL);
+			} else {
+				/*
+				 * Ok we must build a SACK since the
+				 * timer is pending, we got our
+				 * first packet OR there are gaps or
+				 * duplicates.
+				 */
+				(void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer);
+				sctp_send_sack(stcb, SCTP_SO_NOT_LOCKED);
+			}
+		} else {
+			if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) {
+				sctp_timer_start(SCTP_TIMER_TYPE_RECV,
+				                 stcb->sctp_ep, stcb, NULL);
+			}
+		}
+	}
+}
+
+void
+sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc)
+{
+	struct sctp_tmit_chunk *chk;
+	uint32_t tsize, pd_point;
+	uint16_t nxt_todel;
+
+	if (asoc->fragmented_delivery_inprogress) {
+		sctp_service_reassembly(stcb, asoc);
+	}
+	/* Can we proceed further, i.e. the PD-API is complete */
+	if (asoc->fragmented_delivery_inprogress) {
+		/* no */
+		return;
+	}
+	/*
+	 * Now is there some other chunk I can deliver from the reassembly
+	 * queue.
+	 */
+ doit_again:
+	chk = TAILQ_FIRST(&asoc->reasmqueue);
+	if (chk == NULL) {
+		asoc->size_on_reasm_queue = 0;
+		asoc->cnt_on_reasm_queue = 0;
+		return;
+	}
+	nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1;
+	if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) &&
+	    ((nxt_todel == chk->rec.data.stream_seq) ||
+	    (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) {
+		/*
+		 * Yep the first one is here. We setup to start reception,
+		 * by backing down the TSN just in case we can't deliver.
+		 */
+
+		/*
+		 * Before we start though either all of the message should
+		 * be here or the socket buffer max or nothing on the
+		 * delivery queue and something can be delivered.
+		 */
+		if (stcb->sctp_socket) {
+			pd_point = min(SCTP_SB_LIMIT_RCV(stcb->sctp_socket) >> SCTP_PARTIAL_DELIVERY_SHIFT,
+				       stcb->sctp_ep->partial_delivery_point);
+		} else {
+			pd_point = stcb->sctp_ep->partial_delivery_point;
+		}
+		if (sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= pd_point)) {
+			asoc->fragmented_delivery_inprogress = 1;
+			asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1;
+			asoc->str_of_pdapi = chk->rec.data.stream_number;
+			asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
+			asoc->pdapi_ppid = chk->rec.data.payloadtype;
+			asoc->fragment_flags = chk->rec.data.rcv_flags;
+			sctp_service_reassembly(stcb, asoc);
+			if (asoc->fragmented_delivery_inprogress == 0) {
+				goto doit_again;
+			}
+		}
+	}
+}
+
+int
+sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length,
+                  struct sockaddr *src, struct sockaddr *dst,
+                  struct sctphdr *sh, struct sctp_inpcb *inp,
+                  struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t *high_tsn,
+#if defined(__FreeBSD__)
+                  uint8_t mflowtype, uint32_t mflowid,
+#endif
+		  uint32_t vrf_id, uint16_t port)
+{
+	struct sctp_data_chunk *ch, chunk_buf;
+	struct sctp_association *asoc;
+	int num_chunks = 0;	/* number of control chunks processed */
+	int stop_proc = 0;
+	int chk_length, break_flag, last_chunk;
+	int abort_flag = 0, was_a_gap;
+	struct mbuf *m;
+	uint32_t highest_tsn;
+
+	/* set the rwnd */
+	sctp_set_rwnd(stcb, &stcb->asoc);
+
+	m = *mm;
+	SCTP_TCB_LOCK_ASSERT(stcb);
+	asoc = &stcb->asoc;
+	if (SCTP_TSN_GT(asoc->highest_tsn_inside_nr_map, asoc->highest_tsn_inside_map)) {
+		highest_tsn = asoc->highest_tsn_inside_nr_map;
+	} else {
+		highest_tsn = asoc->highest_tsn_inside_map;
+	}
+	was_a_gap = SCTP_TSN_GT(highest_tsn, stcb->asoc.cumulative_tsn);
+	/*
+	 * setup where we got the last DATA packet from for any SACK that
+	 * may need to go out. Don't bump the net. This is done ONLY when a
+	 * chunk is assigned.
+	 */
+	asoc->last_data_chunk_from = net;
+
+#ifndef __Panda__
+	/*-
+	 * Now before we proceed we must figure out if this is a wasted
+	 * cluster... i.e. it is a small packet sent in and yet the driver
+	 * underneath allocated a full cluster for it. If so we must copy it
+	 * to a smaller mbuf and free up the cluster mbuf. This will help
+	 * with cluster starvation. Note for __Panda__ we don't do this
+	 * since it has clusters all the way down to 64 bytes.
+	 */
+	if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) {
+		/* we only handle mbufs that are singletons.. not chains */
+		m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_NOWAIT, 1, MT_DATA);
+		if (m) {
+			/* ok lets see if we can copy the data up */
+			caddr_t *from, *to;
+			/* get the pointers and copy */
+			to = mtod(m, caddr_t *);
+			from = mtod((*mm), caddr_t *);
+			memcpy(to, from, SCTP_BUF_LEN((*mm)));
+			/* copy the length and free up the old */
+			SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm));
+			sctp_m_freem(*mm);
+			/* sucess, back copy */
+			*mm = m;
+		} else {
+			/* We are in trouble in the mbuf world .. yikes */
+			m = *mm;
+		}
+	}
+#endif
+	/* get pointer to the first chunk header */
+	ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
+						     sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
+	if (ch == NULL) {
+		return (1);
+	}
+	/*
+	 * process all DATA chunks...
+	 */
+	*high_tsn = asoc->cumulative_tsn;
+	break_flag = 0;
+	asoc->data_pkts_seen++;
+	while (stop_proc == 0) {
+		/* validate chunk length */
+		chk_length = ntohs(ch->ch.chunk_length);
+		if (length - *offset < chk_length) {
+			/* all done, mutulated chunk */
+			stop_proc = 1;
+			continue;
+		}
+		if (ch->ch.chunk_type == SCTP_DATA) {
+			if ((size_t)chk_length < sizeof(struct sctp_data_chunk)) {
+				/*
+				 * Need to send an abort since we had a
+				 * invalid data chunk.
+				 */
+				struct mbuf *op_err;
+				char msg[SCTP_DIAG_INFO_LEN];
+
+				snprintf(msg, sizeof(msg), "DATA chunk of length %d",
+				         chk_length);
+				op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_19;
+				sctp_abort_association(inp, stcb, m, iphlen,
+				                       src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+				                       mflowtype, mflowid,
+#endif
+				                       vrf_id, port);
+				return (2);
+			}
+			if ((size_t)chk_length == sizeof(struct sctp_data_chunk)) {
+				/*
+				 * Need to send an abort since we had an
+				 * empty data chunk.
+				 */
+				struct mbuf *op_err;
+
+				op_err = sctp_generate_no_user_data_cause(ch->dp.tsn);
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_19;
+				sctp_abort_association(inp, stcb, m, iphlen,
+				                       src, dst, sh, op_err,
+#if defined(__FreeBSD__)
+				                       mflowtype, mflowid,
+#endif
+				                       vrf_id, port);
+				return (2);
+			}
+#ifdef SCTP_AUDITING_ENABLED
+			sctp_audit_log(0xB1, 0);
+#endif
+			if (SCTP_SIZE32(chk_length) == (length - *offset)) {
+				last_chunk = 1;
+			} else {
+				last_chunk = 0;
+			}
+			if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch,
+						      chk_length, net, high_tsn, &abort_flag, &break_flag,
+						      last_chunk)) {
+				num_chunks++;
+			}
+			if (abort_flag)
+				return (2);
+
+			if (break_flag) {
+				/*
+				 * Set because of out of rwnd space and no
+				 * drop rep space left.
+				 */
+				stop_proc = 1;
+				continue;
+			}
+		} else {
+			/* not a data chunk in the data region */
+			switch (ch->ch.chunk_type) {
+			case SCTP_INITIATION:
+			case SCTP_INITIATION_ACK:
+			case SCTP_SELECTIVE_ACK:
+			case SCTP_NR_SELECTIVE_ACK:
+			case SCTP_HEARTBEAT_REQUEST:
+			case SCTP_HEARTBEAT_ACK:
+			case SCTP_ABORT_ASSOCIATION:
+			case SCTP_SHUTDOWN:
+			case SCTP_SHUTDOWN_ACK:
+			case SCTP_OPERATION_ERROR:
+			case SCTP_COOKIE_ECHO:
+			case SCTP_COOKIE_ACK:
+			case SCTP_ECN_ECHO:
+			case SCTP_ECN_CWR:
+			case SCTP_SHUTDOWN_COMPLETE:
+			case SCTP_AUTHENTICATION:
+			case SCTP_ASCONF_ACK:
+			case SCTP_PACKET_DROPPED:
+			case SCTP_STREAM_RESET:
+			case SCTP_FORWARD_CUM_TSN:
+			case SCTP_ASCONF:
+				/*
+				 * Now, what do we do with KNOWN chunks that
+				 * are NOT in the right place?
+				 *
+				 * For now, I do nothing but ignore them. We
+				 * may later want to add sysctl stuff to
+				 * switch out and do either an ABORT() or
+				 * possibly process them.
+				 */
+				if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) {
+					struct mbuf *op_err;
+
+					op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, "");
+					sctp_abort_association(inp, stcb,
+					                       m, iphlen,
+					                       src, dst,
+					                       sh, op_err,
+#if defined(__FreeBSD__)
+					                       mflowtype, mflowid,
+#endif
+					                       vrf_id, port);
+					return (2);
+				}
+				break;
+			default:
+				/* unknown chunk type, use bit rules */
+				if (ch->ch.chunk_type & 0x40) {
+					/* Add a error report to the queue */
+					struct mbuf *merr;
+					struct sctp_paramhdr *phd;
+
+					merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_NOWAIT, 1, MT_DATA);
+					if (merr) {
+						phd = mtod(merr, struct sctp_paramhdr *);
+						/*
+						 * We cheat and use param
+						 * type since we did not
+						 * bother to define a error
+						 * cause struct. They are
+						 * the same basic format
+						 * with different names.
+						 */
+						phd->param_type =
+							htons(SCTP_CAUSE_UNRECOG_CHUNK);
+						phd->param_length =
+							htons(chk_length + sizeof(*phd));
+						SCTP_BUF_LEN(merr) = sizeof(*phd);
+						SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_NOWAIT);
+						if (SCTP_BUF_NEXT(merr)) {
+							if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL) == NULL) {
+								sctp_m_freem(merr);
+							} else {
+								sctp_queue_op_err(stcb, merr);
+							}
+						} else {
+							sctp_m_freem(merr);
+						}
+					}
+				}
+				if ((ch->ch.chunk_type & 0x80) == 0) {
+					/* discard the rest of this packet */
+					stop_proc = 1;
+				}	/* else skip this bad chunk and
+					 * continue... */
+				break;
+			}	/* switch of chunk type */
+		}
+		*offset += SCTP_SIZE32(chk_length);
+		if ((*offset >= length) || stop_proc) {
+			/* no more data left in the mbuf chain */
+			stop_proc = 1;
+			continue;
+		}
+		ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset,
+							     sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf);
+		if (ch == NULL) {
+			*offset = length;
+			stop_proc = 1;
+			continue;
+		}
+	}
+	if (break_flag) {
+		/*
+		 * we need to report rwnd overrun drops.
+		 */
+		sctp_send_packet_dropped(stcb, net, *mm, length, iphlen, 0);
+	}
+	if (num_chunks) {
+		/*
+		 * Did we get data, if so update the time for auto-close and
+		 * give peer credit for being alive.
+		 */
+		SCTP_STAT_INCR(sctps_recvpktwithdata);
+		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_INDATA,
+				       __LINE__);
+		}
+		stcb->asoc.overall_error_count = 0;
+		(void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd);
+	}
+	/* now service all of the reassm queue if needed */
+	if (!(TAILQ_EMPTY(&asoc->reasmqueue)))
+		sctp_service_queues(stcb, asoc);
+
+	if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) {
+		/* Assure that we ack right away */
+		stcb->asoc.send_sack = 1;
+	}
+	/* Start a sack timer or QUEUE a SACK for sending */
+	sctp_sack_check(stcb, was_a_gap);
+	return (0);
+}
+
+static int
+sctp_process_segment_range(struct sctp_tcb *stcb, struct sctp_tmit_chunk **p_tp1, uint32_t last_tsn,
+			   uint16_t frag_strt, uint16_t frag_end, int nr_sacking,
+			   int *num_frs,
+			   uint32_t *biggest_newly_acked_tsn,
+			   uint32_t  *this_sack_lowest_newack,
+			   int *rto_ok)
+{
+	struct sctp_tmit_chunk *tp1;
+	unsigned int theTSN;
+	int j, wake_him = 0, circled = 0;
+
+	/* Recover the tp1 we last saw */
+	tp1 = *p_tp1;
+	if (tp1 == NULL) {
+		tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
+	}
+	for (j = frag_strt; j <= frag_end; j++) {
+		theTSN = j + last_tsn;
+		while (tp1) {
+			if (tp1->rec.data.doing_fast_retransmit)
+				(*num_frs) += 1;
+
+			/*-
+			 * CMT: CUCv2 algorithm. For each TSN being
+			 * processed from the sent queue, track the
+			 * next expected pseudo-cumack, or
+			 * rtx_pseudo_cumack, if required. Separate
+			 * cumack trackers for first transmissions,
+			 * and retransmissions.
+			 */
+			if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
+			    (tp1->whoTo->find_pseudo_cumack == 1) &&
+			    (tp1->snd_count == 1)) {
+				tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq;
+				tp1->whoTo->find_pseudo_cumack = 0;
+			}
+			if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
+			    (tp1->whoTo->find_rtx_pseudo_cumack == 1) &&
+			    (tp1->snd_count > 1)) {
+				tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq;
+				tp1->whoTo->find_rtx_pseudo_cumack = 0;
+			}
+			if (tp1->rec.data.TSN_seq == theTSN) {
+				if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
+					/*-
+					 * must be held until
+					 * cum-ack passes
+					 */
+					if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+						/*-
+						 * If it is less than RESEND, it is
+						 * now no-longer in flight.
+						 * Higher values may already be set
+						 * via previous Gap Ack Blocks...
+						 * i.e. ACKED or RESEND.
+						 */
+						if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
+						                *biggest_newly_acked_tsn)) {
+							*biggest_newly_acked_tsn = tp1->rec.data.TSN_seq;
+						}
+						/*-
+						 * CMT: SFR algo (and HTNA) - set
+						 * saw_newack to 1 for dest being
+						 * newly acked. update
+						 * this_sack_highest_newack if
+						 * appropriate.
+						 */
+						if (tp1->rec.data.chunk_was_revoked == 0)
+							tp1->whoTo->saw_newack = 1;
+
+						if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
+						                tp1->whoTo->this_sack_highest_newack)) {
+							tp1->whoTo->this_sack_highest_newack =
+								tp1->rec.data.TSN_seq;
+						}
+						/*-
+						 * CMT DAC algo: also update
+						 * this_sack_lowest_newack
+						 */
+						if (*this_sack_lowest_newack == 0) {
+							if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+								sctp_log_sack(*this_sack_lowest_newack,
+									      last_tsn,
+									      tp1->rec.data.TSN_seq,
+									      0,
+									      0,
+									      SCTP_LOG_TSN_ACKED);
+							}
+							*this_sack_lowest_newack = tp1->rec.data.TSN_seq;
+						}
+						/*-
+						 * CMT: CUCv2 algorithm. If (rtx-)pseudo-cumack for corresp
+						 * dest is being acked, then we have a new (rtx-)pseudo-cumack. Set
+						 * new_(rtx_)pseudo_cumack to TRUE so that the cwnd for this dest can be
+						 * updated. Also trigger search for the next expected (rtx-)pseudo-cumack.
+						 * Separate pseudo_cumack trackers for first transmissions and
+						 * retransmissions.
+						 */
+						if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) {
+							if (tp1->rec.data.chunk_was_revoked == 0) {
+								tp1->whoTo->new_pseudo_cumack = 1;
+							}
+							tp1->whoTo->find_pseudo_cumack = 1;
+						}
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
+							sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
+						}
+						if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) {
+							if (tp1->rec.data.chunk_was_revoked == 0) {
+								tp1->whoTo->new_pseudo_cumack = 1;
+							}
+							tp1->whoTo->find_rtx_pseudo_cumack = 1;
+						}
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+							sctp_log_sack(*biggest_newly_acked_tsn,
+								      last_tsn,
+								      tp1->rec.data.TSN_seq,
+								      frag_strt,
+								      frag_end,
+								      SCTP_LOG_TSN_ACKED);
+						}
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+							sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP,
+								       tp1->whoTo->flight_size,
+								       tp1->book_size,
+								       (uintptr_t)tp1->whoTo,
+								       tp1->rec.data.TSN_seq);
+						}
+						sctp_flight_size_decrease(tp1);
+						if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
+							(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo,
+														     tp1);
+						}
+						sctp_total_flight_decrease(stcb, tp1);
+
+						tp1->whoTo->net_ack += tp1->send_size;
+						if (tp1->snd_count < 2) {
+							/*-
+							 * True non-retransmited chunk
+							 */
+							tp1->whoTo->net_ack2 += tp1->send_size;
+
+							/*-
+							 * update RTO too ?
+							 */
+							if (tp1->do_rtt) {
+								if (*rto_ok) {
+									tp1->whoTo->RTO =
+										sctp_calculate_rto(stcb,
+												   &stcb->asoc,
+												   tp1->whoTo,
+												   &tp1->sent_rcv_time,
+												   sctp_align_safe_nocopy,
+												   SCTP_RTT_FROM_DATA);
+									*rto_ok = 0;
+								}
+								if (tp1->whoTo->rto_needed == 0) {
+									tp1->whoTo->rto_needed = 1;
+								}
+								tp1->do_rtt = 0;
+							}
+						}
+
+					}
+					if (tp1->sent <= SCTP_DATAGRAM_RESEND) {
+						if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
+						                stcb->asoc.this_sack_highest_gap)) {
+							stcb->asoc.this_sack_highest_gap =
+								tp1->rec.data.TSN_seq;
+						}
+						if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+							sctp_ucount_decr(stcb->asoc.sent_queue_retran_cnt);
+#ifdef SCTP_AUDITING_ENABLED
+							sctp_audit_log(0xB2,
+								       (stcb->asoc.sent_queue_retran_cnt & 0x000000ff));
+#endif
+						}
+					}
+					/*-
+					 * All chunks NOT UNSENT fall through here and are marked
+					 * (leave PR-SCTP ones that are to skip alone though)
+					 */
+					if ((tp1->sent != SCTP_FORWARD_TSN_SKIP) &&
+					    (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
+						tp1->sent = SCTP_DATAGRAM_MARKED;
+					}
+					if (tp1->rec.data.chunk_was_revoked) {
+						/* deflate the cwnd */
+						tp1->whoTo->cwnd -= tp1->book_size;
+						tp1->rec.data.chunk_was_revoked = 0;
+					}
+					/* NR Sack code here */
+					if (nr_sacking &&
+					    (tp1->sent != SCTP_DATAGRAM_NR_ACKED)) {
+						if (stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
+							stcb->asoc.strmout[tp1->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+						} else {
+							panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
+#endif
+						}
+						tp1->sent = SCTP_DATAGRAM_NR_ACKED;
+						if (tp1->data) {
+							/* sa_ignore NO_NULL_CHK */
+							sctp_free_bufspace(stcb, &stcb->asoc, tp1, 1);
+							sctp_m_freem(tp1->data);
+							tp1->data = NULL;
+						}
+						wake_him++;
+					}
+				}
+				break;
+			}	/* if (tp1->TSN_seq == theTSN) */
+			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, theTSN)) {
+				break;
+			}
+			tp1 = TAILQ_NEXT(tp1, sctp_next);
+			if ((tp1 == NULL) && (circled == 0)) {
+				circled++;
+				tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
+			}
+		}	/* end while (tp1) */
+		if (tp1 == NULL) {
+			circled = 0;
+			tp1 = TAILQ_FIRST(&stcb->asoc.sent_queue);
+		}
+		/* In case the fragments were not in order we must reset */
+	} /* end for (j = fragStart */
+	*p_tp1 = tp1;
+	return (wake_him);	/* Return value only used for nr-sack */
+}
+
+
+static int
+sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc,
+		uint32_t last_tsn, uint32_t *biggest_tsn_acked,
+		uint32_t *biggest_newly_acked_tsn, uint32_t *this_sack_lowest_newack,
+		int num_seg, int num_nr_seg, int *rto_ok)
+{
+	struct sctp_gap_ack_block *frag, block;
+	struct sctp_tmit_chunk *tp1;
+	int i;
+	int num_frs = 0;
+	int chunk_freed;
+	int non_revocable;
+	uint16_t frag_strt, frag_end, prev_frag_end;
+
+	tp1 = TAILQ_FIRST(&asoc->sent_queue);
+	prev_frag_end = 0;
+	chunk_freed = 0;
+
+	for (i = 0; i < (num_seg + num_nr_seg); i++) {
+		if (i == num_seg) {
+			prev_frag_end = 0;
+			tp1 = TAILQ_FIRST(&asoc->sent_queue);
+		}
+		frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset,
+		                                                  sizeof(struct sctp_gap_ack_block), (uint8_t *) &block);
+		*offset += sizeof(block);
+		if (frag == NULL) {
+			return (chunk_freed);
+		}
+		frag_strt = ntohs(frag->start);
+		frag_end = ntohs(frag->end);
+
+		if (frag_strt > frag_end) {
+			/* This gap report is malformed, skip it. */
+			continue;
+		}
+		if (frag_strt <= prev_frag_end) {
+			/* This gap report is not in order, so restart. */
+			 tp1 = TAILQ_FIRST(&asoc->sent_queue);
+		}
+		if (SCTP_TSN_GT((last_tsn + frag_end), *biggest_tsn_acked)) {
+			*biggest_tsn_acked = last_tsn + frag_end;
+		}
+		if (i < num_seg) {
+			non_revocable = 0;
+		} else {
+			non_revocable = 1;
+		}
+		if (sctp_process_segment_range(stcb, &tp1, last_tsn, frag_strt, frag_end,
+		                               non_revocable, &num_frs, biggest_newly_acked_tsn,
+		                               this_sack_lowest_newack, rto_ok)) {
+			chunk_freed = 1;
+		}
+		prev_frag_end = frag_end;
+	}
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+		if (num_frs)
+			sctp_log_fr(*biggest_tsn_acked,
+			            *biggest_newly_acked_tsn,
+			            last_tsn, SCTP_FR_LOG_BIGGEST_TSNS);
+	}
+	return (chunk_freed);
+}
+
+static void
+sctp_check_for_revoked(struct sctp_tcb *stcb,
+		       struct sctp_association *asoc, uint32_t cumack,
+		       uint32_t biggest_tsn_acked)
+{
+	struct sctp_tmit_chunk *tp1;
+
+	TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+		if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cumack)) {
+			/*
+			 * ok this guy is either ACK or MARKED. If it is
+			 * ACKED it has been previously acked but not this
+			 * time i.e. revoked.  If it is MARKED it was ACK'ed
+			 * again.
+			 */
+			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked)) {
+				break;
+			}
+			if (tp1->sent == SCTP_DATAGRAM_ACKED) {
+				/* it has been revoked */
+				tp1->sent = SCTP_DATAGRAM_SENT;
+				tp1->rec.data.chunk_was_revoked = 1;
+				/* We must add this stuff back in to
+				 * assure timers and such get started.
+				 */
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
+						       tp1->whoTo->flight_size,
+						       tp1->book_size,
+						       (uintptr_t)tp1->whoTo,
+						       tp1->rec.data.TSN_seq);
+				}
+				sctp_flight_size_increase(tp1);
+				sctp_total_flight_increase(stcb, tp1);
+				/* We inflate the cwnd to compensate for our
+				 * artificial inflation of the flight_size.
+				 */
+				tp1->whoTo->cwnd += tp1->book_size;
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+					sctp_log_sack(asoc->last_acked_seq,
+						      cumack,
+						      tp1->rec.data.TSN_seq,
+						      0,
+						      0,
+						      SCTP_LOG_TSN_REVOKED);
+				}
+			} else if (tp1->sent == SCTP_DATAGRAM_MARKED) {
+				/* it has been re-acked in this SACK */
+				tp1->sent = SCTP_DATAGRAM_ACKED;
+			}
+		}
+		if (tp1->sent == SCTP_DATAGRAM_UNSENT)
+			break;
+	}
+}
+
+
+static void
+sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc,
+			   uint32_t biggest_tsn_acked, uint32_t biggest_tsn_newly_acked, uint32_t this_sack_lowest_newack, int accum_moved)
+{
+	struct sctp_tmit_chunk *tp1;
+	int strike_flag = 0;
+	struct timeval now;
+	int tot_retrans = 0;
+	uint32_t sending_seq;
+	struct sctp_nets *net;
+	int num_dests_sacked = 0;
+
+	/*
+	 * select the sending_seq, this is either the next thing ready to be
+	 * sent but not transmitted, OR, the next seq we assign.
+	 */
+	tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
+	if (tp1 == NULL) {
+		sending_seq = asoc->sending_seq;
+	} else {
+		sending_seq = tp1->rec.data.TSN_seq;
+	}
+
+	/* CMT DAC algo: finding out if SACK is a mixed SACK */
+	if ((asoc->sctp_cmt_on_off > 0) &&
+	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			if (net->saw_newack)
+				num_dests_sacked++;
+		}
+	}
+	if (stcb->asoc.prsctp_supported) {
+		(void)SCTP_GETTIME_TIMEVAL(&now);
+	}
+	TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+		strike_flag = 0;
+		if (tp1->no_fr_allowed) {
+			/* this one had a timeout or something */
+			continue;
+		}
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+			if (tp1->sent < SCTP_DATAGRAM_RESEND)
+				sctp_log_fr(biggest_tsn_newly_acked,
+					    tp1->rec.data.TSN_seq,
+					    tp1->sent,
+					    SCTP_FR_LOG_CHECK_STRIKE);
+		}
+		if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, biggest_tsn_acked) ||
+		    tp1->sent == SCTP_DATAGRAM_UNSENT) {
+			/* done */
+			break;
+		}
+		if (stcb->asoc.prsctp_supported) {
+			if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) {
+				/* Is it expired? */
+#ifndef __FreeBSD__
+				if (timercmp(&now, &tp1->rec.data.timetodrop, >)) {
+#else
+				if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
+#endif
+					/* Yes so drop it */
+					if (tp1->data != NULL) {
+						(void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
+										 SCTP_SO_NOT_LOCKED);
+					}
+					continue;
+				}
+			}
+
+		}
+		if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap)) {
+			/* we are beyond the tsn in the sack  */
+			break;
+		}
+		if (tp1->sent >= SCTP_DATAGRAM_RESEND) {
+			/* either a RESEND, ACKED, or MARKED */
+			/* skip */
+			if (tp1->sent == SCTP_FORWARD_TSN_SKIP) {
+				/* Continue strikin FWD-TSN chunks */
+				tp1->rec.data.fwd_tsn_cnt++;
+			}
+			continue;
+		}
+		/*
+		 * CMT : SFR algo (covers part of DAC and HTNA as well)
+		 */
+		if (tp1->whoTo && tp1->whoTo->saw_newack == 0) {
+			/*
+			 * No new acks were receieved for data sent to this
+			 * dest. Therefore, according to the SFR algo for
+			 * CMT, no data sent to this dest can be marked for
+			 * FR using this SACK.
+			 */
+			continue;
+		} else if (tp1->whoTo && SCTP_TSN_GT(tp1->rec.data.TSN_seq,
+		                                     tp1->whoTo->this_sack_highest_newack)) {
+			/*
+			 * CMT: New acks were receieved for data sent to
+			 * this dest. But no new acks were seen for data
+			 * sent after tp1. Therefore, according to the SFR
+			 * algo for CMT, tp1 cannot be marked for FR using
+			 * this SACK. This step covers part of the DAC algo
+			 * and the HTNA algo as well.
+			 */
+			continue;
+		}
+		/*
+		 * Here we check to see if we were have already done a FR
+		 * and if so we see if the biggest TSN we saw in the sack is
+		 * smaller than the recovery point. If so we don't strike
+		 * the tsn... otherwise we CAN strike the TSN.
+		 */
+		/*
+		 * @@@ JRI: Check for CMT
+		 * if (accum_moved && asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == 0)) {
+		 */
+		if (accum_moved && asoc->fast_retran_loss_recovery) {
+			/*
+			 * Strike the TSN if in fast-recovery and cum-ack
+			 * moved.
+			 */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+				sctp_log_fr(biggest_tsn_newly_acked,
+					    tp1->rec.data.TSN_seq,
+					    tp1->sent,
+					    SCTP_FR_LOG_STRIKE_CHUNK);
+			}
+			if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+				tp1->sent++;
+			}
+			if ((asoc->sctp_cmt_on_off > 0) &&
+			    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
+				/*
+				 * CMT DAC algorithm: If SACK flag is set to
+				 * 0, then lowest_newack test will not pass
+				 * because it would have been set to the
+				 * cumack earlier. If not already to be
+				 * rtx'd, If not a mixed sack and if tp1 is
+				 * not between two sacked TSNs, then mark by
+				 * one more.
+				 * NOTE that we are marking by one additional time since the SACK DAC flag indicates that
+				 * two packets have been received after this missing TSN.
+				 */
+				if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
+				    SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+						sctp_log_fr(16 + num_dests_sacked,
+							    tp1->rec.data.TSN_seq,
+							    tp1->sent,
+							    SCTP_FR_LOG_STRIKE_CHUNK);
+					}
+					tp1->sent++;
+				}
+			}
+		} else if ((tp1->rec.data.doing_fast_retransmit) &&
+		           (asoc->sctp_cmt_on_off == 0)) {
+			/*
+			 * For those that have done a FR we must take
+			 * special consideration if we strike. I.e the
+			 * biggest_newly_acked must be higher than the
+			 * sending_seq at the time we did the FR.
+			 */
+			if (
+#ifdef SCTP_FR_TO_ALTERNATE
+				/*
+				 * If FR's go to new networks, then we must only do
+				 * this for singly homed asoc's. However if the FR's
+				 * go to the same network (Armando's work) then its
+				 * ok to FR multiple times.
+				 */
+				(asoc->numnets < 2)
+#else
+				(1)
+#endif
+				) {
+
+				if (SCTP_TSN_GE(biggest_tsn_newly_acked,
+				                tp1->rec.data.fast_retran_tsn)) {
+					/*
+					 * Strike the TSN, since this ack is
+					 * beyond where things were when we
+					 * did a FR.
+					 */
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+						sctp_log_fr(biggest_tsn_newly_acked,
+							    tp1->rec.data.TSN_seq,
+							    tp1->sent,
+							    SCTP_FR_LOG_STRIKE_CHUNK);
+					}
+					if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+						tp1->sent++;
+					}
+					strike_flag = 1;
+					if ((asoc->sctp_cmt_on_off > 0) &&
+					    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
+						/*
+						 * CMT DAC algorithm: If
+						 * SACK flag is set to 0,
+						 * then lowest_newack test
+						 * will not pass because it
+						 * would have been set to
+						 * the cumack earlier. If
+						 * not already to be rtx'd,
+						 * If not a mixed sack and
+						 * if tp1 is not between two
+						 * sacked TSNs, then mark by
+						 * one more.
+						 * NOTE that we are marking by one additional time since the SACK DAC flag indicates that
+						 * two packets have been received after this missing TSN.
+						 */
+						if ((tp1->sent < SCTP_DATAGRAM_RESEND) &&
+						    (num_dests_sacked == 1) &&
+						    SCTP_TSN_GT(this_sack_lowest_newack,
+						                tp1->rec.data.TSN_seq)) {
+							if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+								sctp_log_fr(32 + num_dests_sacked,
+									    tp1->rec.data.TSN_seq,
+									    tp1->sent,
+									    SCTP_FR_LOG_STRIKE_CHUNK);
+							}
+							if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+								tp1->sent++;
+							}
+						}
+					}
+				}
+			}
+			/*
+			 * JRI: TODO: remove code for HTNA algo. CMT's
+			 * SFR algo covers HTNA.
+			 */
+		} else if (SCTP_TSN_GT(tp1->rec.data.TSN_seq,
+		                       biggest_tsn_newly_acked)) {
+			/*
+			 * We don't strike these: This is the  HTNA
+			 * algorithm i.e. we don't strike If our TSN is
+			 * larger than the Highest TSN Newly Acked.
+			 */
+			;
+		} else {
+			/* Strike the TSN */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+				sctp_log_fr(biggest_tsn_newly_acked,
+					    tp1->rec.data.TSN_seq,
+					    tp1->sent,
+					    SCTP_FR_LOG_STRIKE_CHUNK);
+			}
+			if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+				tp1->sent++;
+			}
+			if ((asoc->sctp_cmt_on_off > 0) &&
+			    SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) {
+				/*
+				 * CMT DAC algorithm: If SACK flag is set to
+				 * 0, then lowest_newack test will not pass
+				 * because it would have been set to the
+				 * cumack earlier. If not already to be
+				 * rtx'd, If not a mixed sack and if tp1 is
+				 * not between two sacked TSNs, then mark by
+				 * one more.
+				 * NOTE that we are marking by one additional time since the SACK DAC flag indicates that
+				 * two packets have been received after this missing TSN.
+				 */
+				if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) &&
+				    SCTP_TSN_GT(this_sack_lowest_newack, tp1->rec.data.TSN_seq)) {
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+						sctp_log_fr(48 + num_dests_sacked,
+							    tp1->rec.data.TSN_seq,
+							    tp1->sent,
+							    SCTP_FR_LOG_STRIKE_CHUNK);
+					}
+					tp1->sent++;
+				}
+			}
+		}
+		if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+			struct sctp_nets *alt;
+
+			/* fix counts and things */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+				sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND,
+					       (tp1->whoTo ? (tp1->whoTo->flight_size) : 0),
+					       tp1->book_size,
+					       (uintptr_t)tp1->whoTo,
+					       tp1->rec.data.TSN_seq);
+			}
+			if (tp1->whoTo) {
+				tp1->whoTo->net_ack++;
+				sctp_flight_size_decrease(tp1);
+				if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
+					(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo,
+												     tp1);
+				}
+			}
+
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
+				sctp_log_rwnd(SCTP_INCREASE_PEER_RWND,
+					      asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
+			}
+			/* add back to the rwnd */
+			asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh));
+
+			/* remove from the total flight */
+			sctp_total_flight_decrease(stcb, tp1);
+
+			if ((stcb->asoc.prsctp_supported) &&
+			    (PR_SCTP_RTX_ENABLED(tp1->flags))) {
+				/* Has it been retransmitted tv_sec times? - we store the retran count there. */
+				if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) {
+					/* Yes, so drop it */
+					if (tp1->data != NULL) {
+						(void)sctp_release_pr_sctp_chunk(stcb, tp1, 1,
+										 SCTP_SO_NOT_LOCKED);
+					}
+					/* Make sure to flag we had a FR */
+					tp1->whoTo->net_ack++;
+					continue;
+				}
+			}
+			/* SCTP_PRINTF("OK, we are now ready to FR this guy\n"); */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) {
+				sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count,
+					    0, SCTP_FR_MARKED);
+			}
+			if (strike_flag) {
+				/* This is a subsequent FR */
+				SCTP_STAT_INCR(sctps_sendmultfastretrans);
+			}
+			sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
+			if (asoc->sctp_cmt_on_off > 0) {
+				/*
+				 * CMT: Using RTX_SSTHRESH policy for CMT.
+				 * If CMT is being used, then pick dest with
+				 * largest ssthresh for any retransmission.
+				 */
+				tp1->no_fr_allowed = 1;
+				alt = tp1->whoTo;
+				/*sa_ignore NO_NULL_CHK*/
+				if (asoc->sctp_cmt_pf > 0) {
+					/* JRS 5/18/07 - If CMT PF is on, use the PF version of find_alt_net() */
+					alt = sctp_find_alternate_net(stcb, alt, 2);
+				} else {
+					/* JRS 5/18/07 - If only CMT is on, use the CMT version of find_alt_net() */
+                                        /*sa_ignore NO_NULL_CHK*/
+					alt = sctp_find_alternate_net(stcb, alt, 1);
+				}
+				if (alt == NULL) {
+					alt = tp1->whoTo;
+				}
+				/*
+				 * CUCv2: If a different dest is picked for
+				 * the retransmission, then new
+				 * (rtx-)pseudo_cumack needs to be tracked
+				 * for orig dest. Let CUCv2 track new (rtx-)
+				 * pseudo-cumack always.
+				 */
+				if (tp1->whoTo) {
+					tp1->whoTo->find_pseudo_cumack = 1;
+					tp1->whoTo->find_rtx_pseudo_cumack = 1;
+				}
+
+			} else {/* CMT is OFF */
+
+#ifdef SCTP_FR_TO_ALTERNATE
+				/* Can we find an alternate? */
+				alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0);
+#else
+				/*
+				 * default behavior is to NOT retransmit
+				 * FR's to an alternate. Armando Caro's
+				 * paper details why.
+				 */
+				alt = tp1->whoTo;
+#endif
+			}
+
+			tp1->rec.data.doing_fast_retransmit = 1;
+			tot_retrans++;
+			/* mark the sending seq for possible subsequent FR's */
+			/*
+			 * SCTP_PRINTF("Marking TSN for FR new value %x\n",
+			 * (uint32_t)tpi->rec.data.TSN_seq);
+			 */
+			if (TAILQ_EMPTY(&asoc->send_queue)) {
+				/*
+				 * If the queue of send is empty then its
+				 * the next sequence number that will be
+				 * assigned so we subtract one from this to
+				 * get the one we last sent.
+				 */
+				tp1->rec.data.fast_retran_tsn = sending_seq;
+			} else {
+				/*
+				 * If there are chunks on the send queue
+				 * (unsent data that has made it from the
+				 * stream queues but not out the door, we
+				 * take the first one (which will have the
+				 * lowest TSN) and subtract one to get the
+				 * one we last sent.
+				 */
+				struct sctp_tmit_chunk *ttt;
+
+				ttt = TAILQ_FIRST(&asoc->send_queue);
+				tp1->rec.data.fast_retran_tsn =
+					ttt->rec.data.TSN_seq;
+			}
+
+			if (tp1->do_rtt) {
+				/*
+				 * this guy had a RTO calculation pending on
+				 * it, cancel it
+				 */
+				if ((tp1->whoTo != NULL) &&
+				    (tp1->whoTo->rto_needed == 0)) {
+					tp1->whoTo->rto_needed = 1;
+				}
+				tp1->do_rtt = 0;
+			}
+			if (alt != tp1->whoTo) {
+				/* yes, there is an alternate. */
+				sctp_free_remote_addr(tp1->whoTo);
+				/*sa_ignore FREED_MEMORY*/
+				tp1->whoTo = alt;
+				atomic_add_int(&alt->ref_count, 1);
+			}
+		}
+	}
+}
+
+struct sctp_tmit_chunk *
+sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb,
+    struct sctp_association *asoc)
+{
+	struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL;
+	struct timeval now;
+	int now_filled = 0;
+
+	if (asoc->prsctp_supported == 0) {
+		return (NULL);
+	}
+	TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
+		if (tp1->sent != SCTP_FORWARD_TSN_SKIP &&
+		    tp1->sent != SCTP_DATAGRAM_RESEND &&
+		    tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
+			/* no chance to advance, out of here */
+			break;
+		}
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
+			if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
+			    (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
+				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
+					       asoc->advanced_peer_ack_point,
+					       tp1->rec.data.TSN_seq, 0, 0);
+			}
+		}
+		if (!PR_SCTP_ENABLED(tp1->flags)) {
+			/*
+			 * We can't fwd-tsn past any that are reliable aka
+			 * retransmitted until the asoc fails.
+			 */
+			break;
+		}
+		if (!now_filled) {
+			(void)SCTP_GETTIME_TIMEVAL(&now);
+			now_filled = 1;
+		}
+		/*
+		 * now we got a chunk which is marked for another
+		 * retransmission to a PR-stream but has run out its chances
+		 * already maybe OR has been marked to skip now. Can we skip
+		 * it if its a resend?
+		 */
+		if (tp1->sent == SCTP_DATAGRAM_RESEND &&
+		    (PR_SCTP_TTL_ENABLED(tp1->flags))) {
+			/*
+			 * Now is this one marked for resend and its time is
+			 * now up?
+			 */
+#ifndef __FreeBSD__
+			if (timercmp(&now, &tp1->rec.data.timetodrop, >)) {
+#else
+			if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) {
+#endif
+				/* Yes so drop it */
+				if (tp1->data) {
+					(void)sctp_release_pr_sctp_chunk(stcb, tp1,
+					    1, SCTP_SO_NOT_LOCKED);
+				}
+			} else {
+				/*
+				 * No, we are done when hit one for resend
+				 * whos time as not expired.
+				 */
+				break;
+			}
+		}
+		/*
+		 * Ok now if this chunk is marked to drop it we can clean up
+		 * the chunk, advance our peer ack point and we can check
+		 * the next chunk.
+		 */
+		if ((tp1->sent == SCTP_FORWARD_TSN_SKIP) ||
+		    (tp1->sent == SCTP_DATAGRAM_NR_ACKED)) {
+			/* advance PeerAckPoint goes forward */
+			if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, asoc->advanced_peer_ack_point)) {
+				asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq;
+				a_adv = tp1;
+			} else if (tp1->rec.data.TSN_seq == asoc->advanced_peer_ack_point) {
+				/* No update but we do save the chk */
+				a_adv = tp1;
+			}
+		} else {
+			/*
+			 * If it is still in RESEND we can advance no
+			 * further
+			 */
+			break;
+		}
+	}
+	return (a_adv);
+}
+
+static int
+sctp_fs_audit(struct sctp_association *asoc)
+{
+	struct sctp_tmit_chunk *chk;
+	int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0;
+	int entry_flight, entry_cnt, ret;
+
+	entry_flight = asoc->total_flight;
+	entry_cnt = asoc->total_flight_count;
+	ret = 0;
+
+	if (asoc->pr_sctp_cnt >= asoc->sent_queue_cnt)
+		return (0);
+
+	TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
+		if (chk->sent < SCTP_DATAGRAM_RESEND) {
+			SCTP_PRINTF("Chk TSN:%u size:%d inflight cnt:%d\n",
+			            chk->rec.data.TSN_seq,
+			            chk->send_size,
+			            chk->snd_count);
+			inflight++;
+		} else if (chk->sent == SCTP_DATAGRAM_RESEND) {
+			resend++;
+		} else if (chk->sent < SCTP_DATAGRAM_ACKED) {
+			inbetween++;
+		} else if (chk->sent > SCTP_DATAGRAM_ACKED) {
+			above++;
+		} else {
+			acked++;
+		}
+	}
+
+	if ((inflight > 0) || (inbetween > 0)) {
+#ifdef INVARIANTS
+		panic("Flight size-express incorrect? \n");
+#else
+		SCTP_PRINTF("asoc->total_flight:%d cnt:%d\n",
+		            entry_flight, entry_cnt);
+
+		SCTP_PRINTF("Flight size-express incorrect F:%d I:%d R:%d Ab:%d ACK:%d\n",
+			    inflight, inbetween, resend, above, acked);
+		ret = 1;
+#endif
+	}
+	return (ret);
+}
+
+
+static void
+sctp_window_probe_recovery(struct sctp_tcb *stcb,
+	                   struct sctp_association *asoc,
+			   struct sctp_tmit_chunk *tp1)
+{
+	tp1->window_probe = 0;
+	if ((tp1->sent >= SCTP_DATAGRAM_ACKED) || (tp1->data == NULL)) {
+		/* TSN's skipped we do NOT move back. */
+		sctp_misc_ints(SCTP_FLIGHT_LOG_DWN_WP_FWD,
+			       tp1->whoTo ? tp1->whoTo->flight_size : 0,
+			       tp1->book_size,
+			       (uintptr_t)tp1->whoTo,
+			       tp1->rec.data.TSN_seq);
+		return;
+	}
+	/* First setup this by shrinking flight */
+	if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
+		(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo,
+									     tp1);
+	}
+	sctp_flight_size_decrease(tp1);
+	sctp_total_flight_decrease(stcb, tp1);
+	/* Now mark for resend */
+	tp1->sent = SCTP_DATAGRAM_RESEND;
+	sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+		sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP,
+			       tp1->whoTo->flight_size,
+			       tp1->book_size,
+			       (uintptr_t)tp1->whoTo,
+			       tp1->rec.data.TSN_seq);
+	}
+}
+
+void
+sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack,
+                         uint32_t rwnd, int *abort_now, int ecne_seen)
+{
+	struct sctp_nets *net;
+	struct sctp_association *asoc;
+	struct sctp_tmit_chunk *tp1, *tp2;
+	uint32_t old_rwnd;
+	int win_probe_recovery = 0;
+	int win_probe_recovered = 0;
+	int j, done_once = 0;
+	int rto_ok = 1;
+
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
+		sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack,
+		               rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
+	}
+	SCTP_TCB_LOCK_ASSERT(stcb);
+#ifdef SCTP_ASOCLOG_OF_TSNS
+	stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack;
+	stcb->asoc.cumack_log_at++;
+	if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
+		stcb->asoc.cumack_log_at = 0;
+	}
+#endif
+	asoc = &stcb->asoc;
+	old_rwnd = asoc->peers_rwnd;
+	if (SCTP_TSN_GT(asoc->last_acked_seq, cumack)) {
+		/* old ack */
+		return;
+	} else if (asoc->last_acked_seq == cumack) {
+		/* Window update sack */
+		asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
+						    (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
+		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+			/* SWS sender side engages */
+			asoc->peers_rwnd = 0;
+		}
+		if (asoc->peers_rwnd > old_rwnd) {
+			goto again;
+		}
+		return;
+	}
+
+	/* First setup for CC stuff */
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		if (SCTP_TSN_GT(cumack, net->cwr_window_tsn)) {
+			/* Drag along the window_tsn for cwr's */
+			net->cwr_window_tsn = cumack;
+		}
+		net->prev_cwnd = net->cwnd;
+		net->net_ack = 0;
+		net->net_ack2 = 0;
+
+		/*
+		 * CMT: Reset CUC and Fast recovery algo variables before
+		 * SACK processing
+		 */
+		net->new_pseudo_cumack = 0;
+		net->will_exit_fast_recovery = 0;
+		if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
+			(*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack)(stcb, net);
+		}
+	}
+	if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
+		uint32_t send_s;
+
+		if (!TAILQ_EMPTY(&asoc->sent_queue)) {
+			tp1 = TAILQ_LAST(&asoc->sent_queue,
+					 sctpchunk_listhead);
+			send_s = tp1->rec.data.TSN_seq + 1;
+		} else {
+			send_s = asoc->sending_seq;
+		}
+		if (SCTP_TSN_GE(cumack, send_s)) {
+#ifndef INVARIANTS
+			struct mbuf *op_err;
+			char msg[SCTP_DIAG_INFO_LEN];
+
+#endif
+#ifdef INVARIANTS
+			panic("Impossible sack 1");
+#else
+
+			*abort_now = 1;
+			/* XXX */
+			snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x",
+			         cumack, send_s);
+			op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+			stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
+			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+			return;
+#endif
+		}
+	}
+	asoc->this_sack_highest_gap = cumack;
+	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_INDATA,
+			       __LINE__);
+	}
+	stcb->asoc.overall_error_count = 0;
+	if (SCTP_TSN_GT(cumack, asoc->last_acked_seq)) {
+		/* process the new consecutive TSN first */
+		TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
+			if (SCTP_TSN_GE(cumack, tp1->rec.data.TSN_seq)) {
+				if (tp1->sent == SCTP_DATAGRAM_UNSENT) {
+					SCTP_PRINTF("Warning, an unsent is now acked?\n");
+				}
+				if (tp1->sent < SCTP_DATAGRAM_ACKED) {
+					/*
+					 * If it is less than ACKED, it is
+					 * now no-longer in flight. Higher
+					 * values may occur during marking
+					 */
+					if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+							sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
+								       tp1->whoTo->flight_size,
+								       tp1->book_size,
+								       (uintptr_t)tp1->whoTo,
+								       tp1->rec.data.TSN_seq);
+						}
+						sctp_flight_size_decrease(tp1);
+						if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
+							(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo,
+														     tp1);
+						}
+						/* sa_ignore NO_NULL_CHK */
+						sctp_total_flight_decrease(stcb, tp1);
+					}
+					tp1->whoTo->net_ack += tp1->send_size;
+					if (tp1->snd_count < 2) {
+						/*
+						 * True non-retransmited
+						 * chunk
+						 */
+						tp1->whoTo->net_ack2 +=
+							tp1->send_size;
+
+						/* update RTO too? */
+						if (tp1->do_rtt) {
+							if (rto_ok) {
+								tp1->whoTo->RTO =
+									/*
+									 * sa_ignore
+									 * NO_NULL_CHK
+									 */
+									sctp_calculate_rto(stcb,
+											   asoc, tp1->whoTo,
+											   &tp1->sent_rcv_time,
+											   sctp_align_safe_nocopy,
+											   SCTP_RTT_FROM_DATA);
+								rto_ok = 0;
+							}
+							if (tp1->whoTo->rto_needed == 0) {
+								tp1->whoTo->rto_needed = 1;
+							}
+							tp1->do_rtt = 0;
+						}
+					}
+					/*
+					 * CMT: CUCv2 algorithm. From the
+					 * cumack'd TSNs, for each TSN being
+					 * acked for the first time, set the
+					 * following variables for the
+					 * corresp destination.
+					 * new_pseudo_cumack will trigger a
+					 * cwnd update.
+					 * find_(rtx_)pseudo_cumack will
+					 * trigger search for the next
+					 * expected (rtx-)pseudo-cumack.
+					 */
+					tp1->whoTo->new_pseudo_cumack = 1;
+					tp1->whoTo->find_pseudo_cumack = 1;
+					tp1->whoTo->find_rtx_pseudo_cumack = 1;
+
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
+						/* sa_ignore NO_NULL_CHK */
+						sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
+					}
+				}
+				if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+					sctp_ucount_decr(asoc->sent_queue_retran_cnt);
+				}
+				if (tp1->rec.data.chunk_was_revoked) {
+					/* deflate the cwnd */
+					tp1->whoTo->cwnd -= tp1->book_size;
+					tp1->rec.data.chunk_was_revoked = 0;
+				}
+				if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
+					if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
+						asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+					} else {
+						panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
+#endif
+					}
+				}
+				TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
+				if (tp1->data) {
+					/* sa_ignore NO_NULL_CHK */
+					sctp_free_bufspace(stcb, asoc, tp1, 1);
+					sctp_m_freem(tp1->data);
+					tp1->data = NULL;
+				}
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+					sctp_log_sack(asoc->last_acked_seq,
+						      cumack,
+						      tp1->rec.data.TSN_seq,
+						      0,
+						      0,
+						      SCTP_LOG_FREE_SENT);
+				}
+				asoc->sent_queue_cnt--;
+				sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
+			} else {
+				break;
+			}
+		}
+
+	}
+#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);
+				SCTP_TCB_LOCK(stcb);
+				atomic_subtract_int(&stcb->asoc.refcnt, 1);
+			}
+		}
+	} else if (stcb->sctp_socket) {
+#else
+	/* sa_ignore NO_NULL_CHK */
+	if (stcb->sctp_socket) {
+#endif
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		struct socket *so;
+
+#endif
+		SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
+			/* sa_ignore NO_NULL_CHK */
+			sctp_wakeup_log(stcb, 1, SCTP_WAKESND_FROM_SACK);
+		}
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		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
+		sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	} else {
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
+			sctp_wakeup_log(stcb, 1, SCTP_NOWAKE_FROM_SACK);
+		}
+	}
+
+	/* JRS - Use the congestion control given in the CC module */
+	if ((asoc->last_acked_seq != cumack) && (ecne_seen == 0)) {
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			if (net->net_ack2 > 0) {
+				/*
+				 * Karn's rule applies to clearing error count, this
+				 * is optional.
+				 */
+				net->error_count = 0;
+				if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
+					/* addr came good */
+					net->dest_state |= SCTP_ADDR_REACHABLE;
+					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
+					                0, (void *)net, SCTP_SO_NOT_LOCKED);
+				}
+				if (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;
+					}
+				}
+				if (net->dest_state & SCTP_ADDR_PF) {
+					net->dest_state &= ~SCTP_ADDR_PF;
+					sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
+					sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
+					asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
+					/* Done with this net */
+					net->net_ack = 0;
+				}
+				/* restore any doubled timers */
+				net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
+				if (net->RTO < stcb->asoc.minrto) {
+					net->RTO = stcb->asoc.minrto;
+				}
+				if (net->RTO > stcb->asoc.maxrto) {
+					net->RTO = stcb->asoc.maxrto;
+				}
+			}
+		}
+		asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0);
+	}
+	asoc->last_acked_seq = cumack;
+
+	if (TAILQ_EMPTY(&asoc->sent_queue)) {
+		/* nothing left in-flight */
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			net->flight_size = 0;
+			net->partial_bytes_acked = 0;
+		}
+		asoc->total_flight = 0;
+		asoc->total_flight_count = 0;
+	}
+
+	/* RWND update */
+	asoc->peers_rwnd = sctp_sbspace_sub(rwnd,
+					    (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
+	if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+		/* SWS sender side engages */
+		asoc->peers_rwnd = 0;
+	}
+	if (asoc->peers_rwnd > old_rwnd) {
+		win_probe_recovery = 1;
+	}
+	/* Now assure a timer where data is queued at */
+again:
+	j = 0;
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		int to_ticks;
+		if (win_probe_recovery && (net->window_probe)) {
+			win_probe_recovered = 1;
+			/*
+			 * Find first chunk that was used with window probe
+			 * and clear the sent
+			 */
+			/* sa_ignore FREED_MEMORY */
+			TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+				if (tp1->window_probe) {
+					/* move back to data send queue */
+					sctp_window_probe_recovery(stcb, asoc, tp1);
+					break;
+				}
+			}
+		}
+		if (net->RTO == 0) {
+			to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
+		} else {
+			to_ticks = MSEC_TO_TICKS(net->RTO);
+		}
+		if (net->flight_size) {
+			j++;
+			(void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
+						  sctp_timeout_handler, &net->rxt_timer);
+			if (net->window_probe) {
+				net->window_probe = 0;
+			}
+		} else {
+			if (net->window_probe) {
+				/* In window probes we must assure a timer is still running there */
+				net->window_probe = 0;
+				if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
+					SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks,
+					                    sctp_timeout_handler, &net->rxt_timer);
+				}
+			} else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
+				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+				                stcb, net,
+				                SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
+			}
+		}
+	}
+	if ((j == 0) &&
+	    (!TAILQ_EMPTY(&asoc->sent_queue)) &&
+	    (asoc->sent_queue_retran_cnt == 0) &&
+	    (win_probe_recovered == 0) &&
+	    (done_once == 0)) {
+		/* huh, this should not happen unless all packets
+		 * are PR-SCTP and marked to skip of course.
+		 */
+		if (sctp_fs_audit(asoc)) {
+			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+				net->flight_size = 0;
+			}
+			asoc->total_flight = 0;
+			asoc->total_flight_count = 0;
+			asoc->sent_queue_retran_cnt = 0;
+			TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+					sctp_flight_size_increase(tp1);
+					sctp_total_flight_increase(stcb, tp1);
+				} else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+					sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+				}
+			}
+		}
+		done_once = 1;
+		goto again;
+	}
+	/**********************************/
+	/* Now what about shutdown issues */
+	/**********************************/
+	if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
+		/* nothing left on sendqueue.. consider done */
+		/* clean up */
+		if ((asoc->stream_queue_cnt == 1) &&
+		    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
+		     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
+		    (asoc->locked_on_sending)
+			) {
+			struct sctp_stream_queue_pending *sp;
+			/* I may be in a state where we got
+			 * all across.. but cannot write more due
+			 * to a shutdown... we abort since the
+			 * user did not indicate EOR in this case. The
+			 * sp will be cleaned during free of the asoc.
+			 */
+			sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
+					sctp_streamhead);
+			if ((sp) && (sp->length == 0)) {
+				/* Let cleanup code purge it */
+				if (sp->msg_is_complete) {
+					asoc->stream_queue_cnt--;
+				} else {
+					asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
+					asoc->locked_on_sending = NULL;
+					asoc->stream_queue_cnt--;
+				}
+			}
+		}
+		if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
+		    (asoc->stream_queue_cnt == 0)) {
+			if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
+				/* Need to abort here */
+				struct mbuf *op_err;
+
+			abort_out_now:
+				*abort_now = 1;
+				/* XXX */
+				op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24;
+				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+			} else {
+				struct sctp_nets *netp;
+
+				if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
+				    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+				}
+				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
+				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+				sctp_stop_timers_for_shutdown(stcb);
+				if (asoc->alternate) {
+					netp = asoc->alternate;
+				} else {
+					netp = asoc->primary_destination;
+				}
+				sctp_send_shutdown(stcb, netp);
+				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
+						 stcb->sctp_ep, stcb, netp);
+				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+						 stcb->sctp_ep, stcb, netp);
+			}
+		} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
+			   (asoc->stream_queue_cnt == 0)) {
+			struct sctp_nets *netp;
+
+			if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
+				goto abort_out_now;
+			}
+			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+			SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
+			SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+			sctp_stop_timers_for_shutdown(stcb);
+			if (asoc->alternate) {
+				netp = asoc->alternate;
+			} else {
+				netp = asoc->primary_destination;
+			}
+			sctp_send_shutdown_ack(stcb, netp);
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
+					 stcb->sctp_ep, stcb, netp);
+		}
+	}
+	/*********************************************/
+	/* Here we perform PR-SCTP procedures        */
+	/* (section 4.2)                             */
+	/*********************************************/
+	/* C1. update advancedPeerAckPoint */
+	if (SCTP_TSN_GT(cumack, asoc->advanced_peer_ack_point)) {
+		asoc->advanced_peer_ack_point = cumack;
+	}
+	/* PR-Sctp issues need to be addressed too */
+	if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
+		struct sctp_tmit_chunk *lchk;
+		uint32_t old_adv_peer_ack_point;
+
+		old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
+		lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
+		/* C3. See if we need to send a Fwd-TSN */
+		if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cumack)) {
+			/*
+			 * ISSUE with ECN, see FWD-TSN processing.
+			 */
+			if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
+				send_forward_tsn(stcb, asoc);
+			} else if (lchk) {
+				/* try to FR fwd-tsn's that get lost too */
+				if (lchk->rec.data.fwd_tsn_cnt >= 3) {
+					send_forward_tsn(stcb, asoc);
+				}
+			}
+		}
+		if (lchk) {
+			/* Assure a timer is up */
+			sctp_timer_start(SCTP_TIMER_TYPE_SEND,
+					 stcb->sctp_ep, stcb, lchk->whoTo);
+		}
+	}
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
+		sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
+			       rwnd,
+			       stcb->asoc.peers_rwnd,
+			       stcb->asoc.total_flight,
+			       stcb->asoc.total_output_queue_size);
+	}
+}
+
+void
+sctp_handle_sack(struct mbuf *m, int offset_seg, int offset_dup,
+                 struct sctp_tcb *stcb,
+                 uint16_t num_seg, uint16_t num_nr_seg, uint16_t num_dup,
+                 int *abort_now, uint8_t flags,
+                 uint32_t cum_ack, uint32_t rwnd, int ecne_seen)
+{
+	struct sctp_association *asoc;
+	struct sctp_tmit_chunk *tp1, *tp2;
+	uint32_t last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack;
+	uint16_t wake_him = 0;
+	uint32_t send_s = 0;
+	long j;
+	int accum_moved = 0;
+	int will_exit_fast_recovery = 0;
+	uint32_t a_rwnd, old_rwnd;
+	int win_probe_recovery = 0;
+	int win_probe_recovered = 0;
+	struct sctp_nets *net = NULL;
+	int done_once;
+	int rto_ok = 1;
+	uint8_t reneged_all = 0;
+	uint8_t cmt_dac_flag;
+	/*
+	 * we take any chance we can to service our queues since we cannot
+	 * get awoken when the socket is read from :<
+	 */
+	/*
+	 * Now perform the actual SACK handling: 1) Verify that it is not an
+	 * old sack, if so discard. 2) If there is nothing left in the send
+	 * queue (cum-ack is equal to last acked) then you have a duplicate
+	 * too, update any rwnd change and verify no timers are running.
+	 * then return. 3) Process any new consequtive data i.e. cum-ack
+	 * moved process these first and note that it moved. 4) Process any
+	 * sack blocks. 5) Drop any acked from the queue. 6) Check for any
+	 * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left,
+	 * sync up flightsizes and things, stop all timers and also check
+	 * for shutdown_pending state. If so then go ahead and send off the
+	 * shutdown. If in shutdown recv, send off the shutdown-ack and
+	 * start that timer, Ret. 9) Strike any non-acked things and do FR
+	 * procedure if needed being sure to set the FR flag. 10) Do pr-sctp
+	 * procedures. 11) Apply any FR penalties. 12) Assure we will SACK
+	 * if in shutdown_recv state.
+	 */
+	SCTP_TCB_LOCK_ASSERT(stcb);
+	/* CMT DAC algo */
+	this_sack_lowest_newack = 0;
+	SCTP_STAT_INCR(sctps_slowpath_sack);
+	last_tsn = cum_ack;
+	cmt_dac_flag = flags & SCTP_SACK_CMT_DAC;
+#ifdef SCTP_ASOCLOG_OF_TSNS
+	stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack;
+	stcb->asoc.cumack_log_at++;
+	if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) {
+		stcb->asoc.cumack_log_at = 0;
+	}
+#endif
+	a_rwnd = rwnd;
+
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) {
+		sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack,
+		               rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd);
+	}
+
+	old_rwnd = stcb->asoc.peers_rwnd;
+	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_INDATA,
+		               __LINE__);
+	}
+	stcb->asoc.overall_error_count = 0;
+	asoc = &stcb->asoc;
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+		sctp_log_sack(asoc->last_acked_seq,
+		              cum_ack,
+		              0,
+		              num_seg,
+		              num_dup,
+		              SCTP_LOG_NEW_SACK);
+	}
+	if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE)) {
+		uint16_t i;
+		uint32_t *dupdata, dblock;
+
+		for (i = 0; i < num_dup; i++) {
+			dupdata = (uint32_t *)sctp_m_getptr(m, offset_dup + i * sizeof(uint32_t),
+			                                    sizeof(uint32_t), (uint8_t *)&dblock);
+			if (dupdata == NULL) {
+				break;
+			}
+			sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED);
+		}
+	}
+	if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
+		/* reality check */
+		if (!TAILQ_EMPTY(&asoc->sent_queue)) {
+			tp1 = TAILQ_LAST(&asoc->sent_queue,
+			                 sctpchunk_listhead);
+			send_s = tp1->rec.data.TSN_seq + 1;
+		} else {
+			tp1 = NULL;
+			send_s = asoc->sending_seq;
+		}
+		if (SCTP_TSN_GE(cum_ack, send_s)) {
+			struct mbuf *op_err;
+			char msg[SCTP_DIAG_INFO_LEN];
+
+			/*
+			 * no way, we have not even sent this TSN out yet.
+			 * Peer is hopelessly messed up with us.
+			 */
+			SCTP_PRINTF("NEW cum_ack:%x send_s:%x is smaller or equal\n",
+			            cum_ack, send_s);
+			if (tp1) {
+				SCTP_PRINTF("Got send_s from tsn:%x + 1 of tp1:%p\n",
+				            tp1->rec.data.TSN_seq, (void *)tp1);
+			}
+		hopeless_peer:
+			*abort_now = 1;
+			/* XXX */
+			snprintf(msg, sizeof(msg), "Cum ack %8.8x greater or equal then TSN %8.8x",
+			         cum_ack, send_s);
+			op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+			stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25;
+			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+			return;
+		}
+	}
+	/**********************/
+	/* 1) check the range */
+	/**********************/
+	if (SCTP_TSN_GT(asoc->last_acked_seq, last_tsn)) {
+		/* acking something behind */
+		return;
+	}
+
+	/* update the Rwnd of the peer */
+	if (TAILQ_EMPTY(&asoc->sent_queue) &&
+	    TAILQ_EMPTY(&asoc->send_queue) &&
+	    (asoc->stream_queue_cnt == 0)) {
+		/* nothing left on send/sent and strmq */
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
+			sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
+			                  asoc->peers_rwnd, 0, 0, a_rwnd);
+		}
+		asoc->peers_rwnd = a_rwnd;
+		if (asoc->sent_queue_retran_cnt) {
+			asoc->sent_queue_retran_cnt = 0;
+		}
+		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+			/* SWS sender side engages */
+			asoc->peers_rwnd = 0;
+		}
+		/* stop any timers */
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+			                stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26);
+			net->partial_bytes_acked = 0;
+			net->flight_size = 0;
+		}
+		asoc->total_flight = 0;
+		asoc->total_flight_count = 0;
+		return;
+	}
+	/*
+	 * We init netAckSz and netAckSz2 to 0. These are used to track 2
+	 * things. The total byte count acked is tracked in netAckSz AND
+	 * netAck2 is used to track the total bytes acked that are un-
+	 * amibguious and were never retransmitted. We track these on a per
+	 * destination address basis.
+	 */
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		if (SCTP_TSN_GT(cum_ack, net->cwr_window_tsn)) {
+			/* Drag along the window_tsn for cwr's */
+			net->cwr_window_tsn = cum_ack;
+		}
+		net->prev_cwnd = net->cwnd;
+		net->net_ack = 0;
+		net->net_ack2 = 0;
+
+		/*
+		 * CMT: Reset CUC and Fast recovery algo variables before
+		 * SACK processing
+		 */
+		net->new_pseudo_cumack = 0;
+		net->will_exit_fast_recovery = 0;
+		if (stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack) {
+			(*stcb->asoc.cc_functions.sctp_cwnd_prepare_net_for_sack)(stcb, net);
+		}
+	}
+	/* process the new consecutive TSN first */
+	TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+		if (SCTP_TSN_GE(last_tsn, tp1->rec.data.TSN_seq)) {
+			if (tp1->sent != SCTP_DATAGRAM_UNSENT) {
+				accum_moved = 1;
+				if (tp1->sent < SCTP_DATAGRAM_ACKED) {
+					/*
+					 * If it is less than ACKED, it is
+					 * now no-longer in flight. Higher
+					 * values may occur during marking
+					 */
+					if ((tp1->whoTo->dest_state &
+					     SCTP_ADDR_UNCONFIRMED) &&
+					    (tp1->snd_count < 2)) {
+						/*
+						 * If there was no retran
+						 * and the address is
+						 * un-confirmed and we sent
+						 * there and are now
+						 * sacked.. its confirmed,
+						 * mark it so.
+						 */
+						tp1->whoTo->dest_state &=
+							~SCTP_ADDR_UNCONFIRMED;
+					}
+					if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+							sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA,
+							               tp1->whoTo->flight_size,
+							               tp1->book_size,
+							               (uintptr_t)tp1->whoTo,
+							               tp1->rec.data.TSN_seq);
+						}
+						sctp_flight_size_decrease(tp1);
+						sctp_total_flight_decrease(stcb, tp1);
+						if (stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged) {
+							(*stcb->asoc.cc_functions.sctp_cwnd_update_tsn_acknowledged)(tp1->whoTo,
+														     tp1);
+						}
+					}
+					tp1->whoTo->net_ack += tp1->send_size;
+
+					/* CMT SFR and DAC algos */
+					this_sack_lowest_newack = tp1->rec.data.TSN_seq;
+					tp1->whoTo->saw_newack = 1;
+
+					if (tp1->snd_count < 2) {
+						/*
+						 * True non-retransmited
+						 * chunk
+						 */
+						tp1->whoTo->net_ack2 +=
+							tp1->send_size;
+
+						/* update RTO too? */
+						if (tp1->do_rtt) {
+							if (rto_ok) {
+								tp1->whoTo->RTO =
+									sctp_calculate_rto(stcb,
+											   asoc, tp1->whoTo,
+											   &tp1->sent_rcv_time,
+											   sctp_align_safe_nocopy,
+											   SCTP_RTT_FROM_DATA);
+								rto_ok = 0;
+							}
+							if (tp1->whoTo->rto_needed == 0) {
+								tp1->whoTo->rto_needed = 1;
+							}
+							tp1->do_rtt = 0;
+						}
+					}
+					/*
+					 * CMT: CUCv2 algorithm. From the
+					 * cumack'd TSNs, for each TSN being
+					 * acked for the first time, set the
+					 * following variables for the
+					 * corresp destination.
+					 * new_pseudo_cumack will trigger a
+					 * cwnd update.
+					 * find_(rtx_)pseudo_cumack will
+					 * trigger search for the next
+					 * expected (rtx-)pseudo-cumack.
+					 */
+					tp1->whoTo->new_pseudo_cumack = 1;
+					tp1->whoTo->find_pseudo_cumack = 1;
+					tp1->whoTo->find_rtx_pseudo_cumack = 1;
+
+
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+						sctp_log_sack(asoc->last_acked_seq,
+						              cum_ack,
+						              tp1->rec.data.TSN_seq,
+						              0,
+						              0,
+						              SCTP_LOG_TSN_ACKED);
+					}
+					if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) {
+						sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK);
+					}
+				}
+				if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+					sctp_ucount_decr(asoc->sent_queue_retran_cnt);
+#ifdef SCTP_AUDITING_ENABLED
+					sctp_audit_log(0xB3,
+					               (asoc->sent_queue_retran_cnt & 0x000000ff));
+#endif
+				}
+				if (tp1->rec.data.chunk_was_revoked) {
+					/* deflate the cwnd */
+					tp1->whoTo->cwnd -= tp1->book_size;
+					tp1->rec.data.chunk_was_revoked = 0;
+				}
+				if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
+					tp1->sent = SCTP_DATAGRAM_ACKED;
+				}
+			}
+		} else {
+			break;
+		}
+	}
+	biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn;
+	/* always set this up to cum-ack */
+	asoc->this_sack_highest_gap = last_tsn;
+
+	if ((num_seg > 0) || (num_nr_seg > 0)) {
+
+		/*
+		 * CMT: SFR algo (and HTNA) - this_sack_highest_newack has
+		 * to be greater than the cumack. Also reset saw_newack to 0
+		 * for all dests.
+		 */
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			net->saw_newack = 0;
+			net->this_sack_highest_newack = last_tsn;
+		}
+
+		/*
+		 * thisSackHighestGap will increase while handling NEW
+		 * segments this_sack_highest_newack will increase while
+		 * handling NEWLY ACKED chunks. this_sack_lowest_newack is
+		 * used for CMT DAC algo. saw_newack will also change.
+		 */
+		if (sctp_handle_segments(m, &offset_seg, stcb, asoc, last_tsn, &biggest_tsn_acked,
+			&biggest_tsn_newly_acked, &this_sack_lowest_newack,
+			num_seg, num_nr_seg, &rto_ok)) {
+			wake_him++;
+		}
+		if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) {
+			/*
+			 * validate the biggest_tsn_acked in the gap acks if
+			 * strict adherence is wanted.
+			 */
+			if (SCTP_TSN_GE(biggest_tsn_acked, send_s)) {
+				/*
+				 * peer is either confused or we are under
+				 * attack. We must abort.
+				 */
+				SCTP_PRINTF("Hopeless peer! biggest_tsn_acked:%x largest seq:%x\n",
+				            biggest_tsn_acked, send_s);
+				goto hopeless_peer;
+			}
+		}
+	}
+	/*******************************************/
+	/* cancel ALL T3-send timer if accum moved */
+	/*******************************************/
+	if (asoc->sctp_cmt_on_off > 0) {
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			if (net->new_pseudo_cumack)
+				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+				                stcb, net,
+				                SCTP_FROM_SCTP_INDATA + SCTP_LOC_27);
+
+		}
+	} else {
+		if (accum_moved) {
+			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+				                stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28);
+			}
+		}
+	}
+	/********************************************/
+	/* drop the acked chunks from the sentqueue */
+	/********************************************/
+	asoc->last_acked_seq = cum_ack;
+
+	TAILQ_FOREACH_SAFE(tp1, &asoc->sent_queue, sctp_next, tp2) {
+		if (SCTP_TSN_GT(tp1->rec.data.TSN_seq, cum_ack)) {
+			break;
+		}
+		if (tp1->sent != SCTP_DATAGRAM_NR_ACKED) {
+			if (asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues > 0) {
+				asoc->strmout[tp1->rec.data.stream_number].chunks_on_queues--;
+#ifdef INVARIANTS
+			} else {
+				panic("No chunks on the queues for sid %u.", tp1->rec.data.stream_number);
+#endif
+			}
+		}
+		TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next);
+		if (PR_SCTP_ENABLED(tp1->flags)) {
+			if (asoc->pr_sctp_cnt != 0)
+				asoc->pr_sctp_cnt--;
+		}
+		asoc->sent_queue_cnt--;
+		if (tp1->data) {
+			/* sa_ignore NO_NULL_CHK */
+			sctp_free_bufspace(stcb, asoc, tp1, 1);
+			sctp_m_freem(tp1->data);
+			tp1->data = NULL;
+			if (asoc->prsctp_supported && PR_SCTP_BUF_ENABLED(tp1->flags)) {
+				asoc->sent_queue_cnt_removeable--;
+			}
+		}
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) {
+			sctp_log_sack(asoc->last_acked_seq,
+			              cum_ack,
+			              tp1->rec.data.TSN_seq,
+			              0,
+			              0,
+			              SCTP_LOG_FREE_SENT);
+		}
+		sctp_free_a_chunk(stcb, tp1, SCTP_SO_NOT_LOCKED);
+		wake_him++;
+	}
+	if (TAILQ_EMPTY(&asoc->sent_queue) && (asoc->total_flight > 0)) {
+#ifdef INVARIANTS
+		panic("Warning flight size is postive and should be 0");
+#else
+		SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n",
+		            asoc->total_flight);
+#endif
+		asoc->total_flight = 0;
+	}
+
+#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)) ||
+			    (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);
+				SCTP_TCB_LOCK(stcb);
+				atomic_subtract_int(&stcb->asoc.refcnt, 1);
+			}
+		}
+	} else if ((wake_him) && (stcb->sctp_socket)) {
+#else
+	/* sa_ignore NO_NULL_CHK */
+	if ((wake_him) && (stcb->sctp_socket)) {
+#endif
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		struct socket *so;
+
+#endif
+		SOCKBUF_LOCK(&stcb->sctp_socket->so_snd);
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
+			sctp_wakeup_log(stcb, wake_him, SCTP_WAKESND_FROM_SACK);
+		}
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		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
+		sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket);
+#if defined(__APPLE__) || defined(SCTP_SO_LOCK_TESTING)
+		SCTP_SOCKET_UNLOCK(so, 1);
+#endif
+	} else {
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) {
+			sctp_wakeup_log(stcb, wake_him, SCTP_NOWAKE_FROM_SACK);
+		}
+	}
+
+	if (asoc->fast_retran_loss_recovery && accum_moved) {
+		if (SCTP_TSN_GE(asoc->last_acked_seq, asoc->fast_recovery_tsn)) {
+			/* Setup so we will exit RFC2582 fast recovery */
+			will_exit_fast_recovery = 1;
+		}
+	}
+	/*
+	 * Check for revoked fragments:
+	 *
+	 * if Previous sack - Had no frags then we can't have any revoked if
+	 * Previous sack - Had frag's then - If we now have frags aka
+	 * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked
+	 * some of them. else - The peer revoked all ACKED fragments, since
+	 * we had some before and now we have NONE.
+	 */
+
+	if (num_seg) {
+		sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked);
+		asoc->saw_sack_with_frags = 1;
+	} else if (asoc->saw_sack_with_frags) {
+		int cnt_revoked = 0;
+
+		/* Peer revoked all dg's marked or acked */
+		TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+			if (tp1->sent == SCTP_DATAGRAM_ACKED) {
+				tp1->sent = SCTP_DATAGRAM_SENT;
+				if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) {
+					sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE,
+					               tp1->whoTo->flight_size,
+					               tp1->book_size,
+					               (uintptr_t)tp1->whoTo,
+					               tp1->rec.data.TSN_seq);
+				}
+				sctp_flight_size_increase(tp1);
+				sctp_total_flight_increase(stcb, tp1);
+				tp1->rec.data.chunk_was_revoked = 1;
+				/*
+				 * To ensure that this increase in
+				 * flightsize, which is artificial,
+				 * does not throttle the sender, we
+				 * also increase the cwnd
+				 * artificially.
+				 */
+				tp1->whoTo->cwnd += tp1->book_size;
+				cnt_revoked++;
+			}
+		}
+		if (cnt_revoked) {
+			reneged_all = 1;
+		}
+		asoc->saw_sack_with_frags = 0;
+	}
+	if (num_nr_seg > 0)
+		asoc->saw_sack_with_nr_frags = 1;
+	else
+		asoc->saw_sack_with_nr_frags = 0;
+
+	/* JRS - Use the congestion control given in the CC module */
+	if (ecne_seen == 0) {
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			if (net->net_ack2 > 0) {
+				/*
+				 * Karn's rule applies to clearing error count, this
+				 * is optional.
+				 */
+				net->error_count = 0;
+				if (!(net->dest_state & SCTP_ADDR_REACHABLE)) {
+					/* addr came good */
+					net->dest_state |= SCTP_ADDR_REACHABLE;
+					sctp_ulp_notify(SCTP_NOTIFY_INTERFACE_UP, stcb,
+					                0, (void *)net, SCTP_SO_NOT_LOCKED);
+				}
+
+				if (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;
+					}
+				}
+
+				if (net->dest_state & SCTP_ADDR_PF) {
+					net->dest_state &= ~SCTP_ADDR_PF;
+					sctp_timer_stop(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INPUT + SCTP_LOC_3);
+					sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep, stcb, net);
+					asoc->cc_functions.sctp_cwnd_update_exit_pf(stcb, net);
+					/* Done with this net */
+					net->net_ack = 0;
+				}
+				/* restore any doubled timers */
+				net->RTO = (net->lastsa >> SCTP_RTT_SHIFT) + net->lastsv;
+				if (net->RTO < stcb->asoc.minrto) {
+					net->RTO = stcb->asoc.minrto;
+				}
+				if (net->RTO > stcb->asoc.maxrto) {
+					net->RTO = stcb->asoc.maxrto;
+				}
+			}
+		}
+		asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery);
+	}
+
+	if (TAILQ_EMPTY(&asoc->sent_queue)) {
+		/* nothing left in-flight */
+		TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+			/* stop all timers */
+			sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+			                stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30);
+			net->flight_size = 0;
+			net->partial_bytes_acked = 0;
+		}
+		asoc->total_flight = 0;
+		asoc->total_flight_count = 0;
+	}
+
+	/**********************************/
+	/* Now what about shutdown issues */
+	/**********************************/
+	if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) {
+		/* nothing left on sendqueue.. consider done */
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
+			sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
+			                  asoc->peers_rwnd, 0, 0, a_rwnd);
+		}
+		asoc->peers_rwnd = a_rwnd;
+		if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+			/* SWS sender side engages */
+			asoc->peers_rwnd = 0;
+		}
+		/* clean up */
+		if ((asoc->stream_queue_cnt == 1) &&
+		    ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) ||
+		     (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) &&
+		    (asoc->locked_on_sending)
+			) {
+			struct sctp_stream_queue_pending *sp;
+			/* I may be in a state where we got
+			 * all across.. but cannot write more due
+			 * to a shutdown... we abort since the
+			 * user did not indicate EOR in this case.
+			 */
+			sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue),
+			                sctp_streamhead);
+			if ((sp) && (sp->length == 0)) {
+				asoc->locked_on_sending = NULL;
+				if (sp->msg_is_complete) {
+					asoc->stream_queue_cnt--;
+				} else {
+					asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT;
+					asoc->stream_queue_cnt--;
+				}
+			}
+		}
+		if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) &&
+		    (asoc->stream_queue_cnt == 0)) {
+			if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
+				/* Need to abort here */
+				struct mbuf *op_err;
+
+			abort_out_now:
+				*abort_now = 1;
+				/* XXX */
+				op_err = sctp_generate_cause(SCTP_CAUSE_USER_INITIATED_ABT, "");
+				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31;
+				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+				return;
+			} else {
+				struct sctp_nets *netp;
+
+				if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) ||
+				    (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
+					SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+				}
+				SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT);
+				SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+				sctp_stop_timers_for_shutdown(stcb);
+				if (asoc->alternate) {
+					netp = asoc->alternate;
+				} else {
+					netp = asoc->primary_destination;
+				}
+				sctp_send_shutdown(stcb, netp);
+				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN,
+				                 stcb->sctp_ep, stcb, netp);
+				sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD,
+				                 stcb->sctp_ep, stcb, netp);
+			}
+			return;
+		} else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) &&
+			   (asoc->stream_queue_cnt == 0)) {
+			struct sctp_nets *netp;
+
+			if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) {
+				goto abort_out_now;
+			}
+			SCTP_STAT_DECR_GAUGE32(sctps_currestab);
+			SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT);
+			SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING);
+			sctp_stop_timers_for_shutdown(stcb);
+			if (asoc->alternate) {
+				netp = asoc->alternate;
+			} else {
+				netp = asoc->primary_destination;
+			}
+			sctp_send_shutdown_ack(stcb, netp);
+			sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK,
+			                 stcb->sctp_ep, stcb, netp);
+			return;
+		}
+	}
+	/*
+	 * Now here we are going to recycle net_ack for a different use...
+	 * HEADS UP.
+	 */
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		net->net_ack = 0;
+	}
+
+	/*
+	 * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking
+	 * to be done. Setting this_sack_lowest_newack to the cum_ack will
+	 * automatically ensure that.
+	 */
+	if ((asoc->sctp_cmt_on_off > 0) &&
+	    SCTP_BASE_SYSCTL(sctp_cmt_use_dac) &&
+	    (cmt_dac_flag == 0)) {
+		this_sack_lowest_newack = cum_ack;
+	}
+	if ((num_seg > 0) || (num_nr_seg > 0)) {
+		sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked,
+		                           biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved);
+	}
+	/* JRS - Use the congestion control given in the CC module */
+	asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc);
+
+	/* Now are we exiting loss recovery ? */
+	if (will_exit_fast_recovery) {
+		/* Ok, we must exit fast recovery */
+		asoc->fast_retran_loss_recovery = 0;
+	}
+	if ((asoc->sat_t3_loss_recovery) &&
+	    SCTP_TSN_GE(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn)) {
+		/* end satellite t3 loss recovery */
+		asoc->sat_t3_loss_recovery = 0;
+	}
+	/*
+	 * CMT Fast recovery
+	 */
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		if (net->will_exit_fast_recovery) {
+			/* Ok, we must exit fast recovery */
+			net->fast_retran_loss_recovery = 0;
+		}
+	}
+
+	/* Adjust and set the new rwnd value */
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) {
+		sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK,
+		                  asoc->peers_rwnd, asoc->total_flight, (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd);
+	}
+	asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd,
+	                                    (uint32_t) (asoc->total_flight + (asoc->total_flight_count * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh))));
+	if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) {
+		/* SWS sender side engages */
+		asoc->peers_rwnd = 0;
+	}
+	if (asoc->peers_rwnd > old_rwnd) {
+		win_probe_recovery = 1;
+	}
+
+	/*
+	 * Now we must setup so we have a timer up for anyone with
+	 * outstanding data.
+	 */
+	done_once = 0;
+again:
+	j = 0;
+	TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+		if (win_probe_recovery && (net->window_probe)) {
+			win_probe_recovered = 1;
+			/*-
+			 * Find first chunk that was used with
+			 * window probe and clear the event. Put
+			 * it back into the send queue as if has
+			 * not been sent.
+			 */
+			TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+				if (tp1->window_probe) {
+					sctp_window_probe_recovery(stcb, asoc, tp1);
+					break;
+				}
+			}
+		}
+		if (net->flight_size) {
+			j++;
+			if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
+				sctp_timer_start(SCTP_TIMER_TYPE_SEND,
+				                 stcb->sctp_ep, stcb, net);
+			}
+			if (net->window_probe) {
+				net->window_probe = 0;
+			}
+		} else {
+			if (net->window_probe) {
+				/* In window probes we must assure a timer is still running there */
+				if (!SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
+					sctp_timer_start(SCTP_TIMER_TYPE_SEND,
+					                 stcb->sctp_ep, stcb, net);
+
+				}
+			} else if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
+				sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep,
+				                stcb, net,
+				                SCTP_FROM_SCTP_INDATA + SCTP_LOC_22);
+			}
+		}
+	}
+	if ((j == 0) &&
+	    (!TAILQ_EMPTY(&asoc->sent_queue)) &&
+	    (asoc->sent_queue_retran_cnt == 0) &&
+	    (win_probe_recovered == 0) &&
+	    (done_once == 0)) {
+		/* huh, this should not happen unless all packets
+		 * are PR-SCTP and marked to skip of course.
+		 */
+		if (sctp_fs_audit(asoc)) {
+			TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
+				net->flight_size = 0;
+			}
+			asoc->total_flight = 0;
+			asoc->total_flight_count = 0;
+			asoc->sent_queue_retran_cnt = 0;
+			TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) {
+				if (tp1->sent < SCTP_DATAGRAM_RESEND) {
+					sctp_flight_size_increase(tp1);
+					sctp_total_flight_increase(stcb, tp1);
+				} else if (tp1->sent == SCTP_DATAGRAM_RESEND) {
+					sctp_ucount_incr(asoc->sent_queue_retran_cnt);
+				}
+			}
+		}
+		done_once = 1;
+		goto again;
+	}
+	/*********************************************/
+	/* Here we perform PR-SCTP procedures        */
+	/* (section 4.2)                             */
+	/*********************************************/
+	/* C1. update advancedPeerAckPoint */
+	if (SCTP_TSN_GT(cum_ack, asoc->advanced_peer_ack_point)) {
+		asoc->advanced_peer_ack_point = cum_ack;
+	}
+	/* C2. try to further move advancedPeerAckPoint ahead */
+	if ((asoc->prsctp_supported) && (asoc->pr_sctp_cnt > 0)) {
+		struct sctp_tmit_chunk *lchk;
+		uint32_t old_adv_peer_ack_point;
+
+		old_adv_peer_ack_point = asoc->advanced_peer_ack_point;
+		lchk = sctp_try_advance_peer_ack_point(stcb, asoc);
+		/* C3. See if we need to send a Fwd-TSN */
+		if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, cum_ack)) {
+			/*
+			 * ISSUE with ECN, see FWD-TSN processing.
+			 */
+			if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_TRY_ADVANCE) {
+				sctp_misc_ints(SCTP_FWD_TSN_CHECK,
+				               0xee, cum_ack, asoc->advanced_peer_ack_point,
+				               old_adv_peer_ack_point);
+			}
+			if (SCTP_TSN_GT(asoc->advanced_peer_ack_point, old_adv_peer_ack_point)) {
+				send_forward_tsn(stcb, asoc);
+			} else if (lchk) {
+				/* try to FR fwd-tsn's that get lost too */
+				if (lchk->rec.data.fwd_tsn_cnt >= 3) {
+					send_forward_tsn(stcb, asoc);
+				}
+			}
+		}
+		if (lchk) {
+			/* Assure a timer is up */
+			sctp_timer_start(SCTP_TIMER_TYPE_SEND,
+			                 stcb->sctp_ep, stcb, lchk->whoTo);
+		}
+	}
+	if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) {
+		sctp_misc_ints(SCTP_SACK_RWND_UPDATE,
+		               a_rwnd,
+		               stcb->asoc.peers_rwnd,
+		               stcb->asoc.total_flight,
+		               stcb->asoc.total_output_queue_size);
+	}
+}
+
+void
+sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, int *abort_flag)
+{
+	/* Copy cum-ack */
+	uint32_t cum_ack, a_rwnd;
+
+	cum_ack = ntohl(cp->cumulative_tsn_ack);
+	/* Arrange so a_rwnd does NOT change */
+	a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight;
+
+	/* Now call the express sack handling */
+	sctp_express_handle_sack(stcb, cum_ack, a_rwnd, abort_flag, 0);
+}
+
+static void
+sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb,
+    struct sctp_stream_in *strmin)
+{
+	struct sctp_queued_to_read *ctl, *nctl;
+	struct sctp_association *asoc;
+	uint16_t tt;
+
+	asoc = &stcb->asoc;
+	tt = strmin->last_sequence_delivered;
+	/*
+	 * First deliver anything prior to and including the stream no that
+	 * came in
+	 */
+	TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
+		if (SCTP_SSN_GE(tt, ctl->sinfo_ssn)) {
+			/* this is deliverable now */
+			TAILQ_REMOVE(&strmin->inqueue, ctl, next);
+			/* subtract pending on streams */
+			asoc->size_on_all_streams -= ctl->length;
+			sctp_ucount_decr(asoc->cnt_on_all_streams);
+			/* deliver it to at least the delivery-q */
+			if (stcb->sctp_socket) {
+				sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
+				sctp_add_to_readq(stcb->sctp_ep, stcb,
+						  ctl,
+						  &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
+			}
+		} else {
+			/* no more delivery now. */
+			break;
+		}
+	}
+	/*
+	 * now we must deliver things in queue the normal way  if any are
+	 * now ready.
+	 */
+	tt = strmin->last_sequence_delivered + 1;
+	TAILQ_FOREACH_SAFE(ctl, &strmin->inqueue, next, nctl) {
+		if (tt == ctl->sinfo_ssn) {
+			/* this is deliverable now */
+			TAILQ_REMOVE(&strmin->inqueue, ctl, next);
+			/* subtract pending on streams */
+			asoc->size_on_all_streams -= ctl->length;
+			sctp_ucount_decr(asoc->cnt_on_all_streams);
+			/* deliver it to at least the delivery-q */
+			strmin->last_sequence_delivered = ctl->sinfo_ssn;
+			if (stcb->sctp_socket) {
+				sctp_mark_non_revokable(asoc, ctl->sinfo_tsn);
+				sctp_add_to_readq(stcb->sctp_ep, stcb,
+						  ctl,
+						  &stcb->sctp_socket->so_rcv, 1, SCTP_READ_LOCK_HELD, SCTP_SO_NOT_LOCKED);
+
+			}
+			tt = strmin->last_sequence_delivered + 1;
+		} else {
+			break;
+		}
+	}
+}
+
+static void
+sctp_flush_reassm_for_str_seq(struct sctp_tcb *stcb,
+	struct sctp_association *asoc,
+	uint16_t stream, uint16_t seq)
+{
+	struct sctp_tmit_chunk *chk, *nchk;
+
+	/* For each one on here see if we need to toss it */
+	/*
+	 * For now large messages held on the reasmqueue that are
+	 * complete will be tossed too. We could in theory do more
+	 * work to spin through and stop after dumping one msg aka
+	 * seeing the start of a new msg at the head, and call the
+	 * delivery function... to see if it can be delivered... But
+	 * for now we just dump everything on the queue.
+	 */
+	TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
+		/* Do not toss it if on a different stream or
+		 * marked for unordered delivery in which case
+		 * the stream sequence number has no meaning.
+		 */
+		if ((chk->rec.data.stream_number != stream) ||
+		    ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == SCTP_DATA_UNORDERED)) {
+				continue;
+		}
+		if (chk->rec.data.stream_seq == seq) {
+			/* It needs to be tossed */
+			TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
+			if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
+				asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
+				asoc->str_of_pdapi = chk->rec.data.stream_number;
+				asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
+				asoc->fragment_flags = chk->rec.data.rcv_flags;
+			}
+			asoc->size_on_reasm_queue -= chk->send_size;
+			sctp_ucount_decr(asoc->cnt_on_reasm_queue);
+
+			/* Clear up any stream problem */
+			if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
+			    SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
+				/*
+				 * We must dump forward this streams
+				 * sequence number if the chunk is
+				 * not unordered that is being
+				 * skipped. There is a chance that
+				 * if the peer does not include the
+				 * last fragment in its FWD-TSN we
+				 * WILL have a problem here since
+				 * you would have a partial chunk in
+				 * queue that may not be
+				 * deliverable. Also if a Partial
+				 * delivery API as started the user
+				 * may get a partial chunk. The next
+				 * read returning a new chunk...
+				 * really ugly but I see no way
+				 * around it! Maybe a notify??
+				 */
+				asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
+			}
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+		} else if (SCTP_SSN_GT(chk->rec.data.stream_seq, seq)) {
+			/* If the stream_seq is > than the purging one, we are done */
+			break;
+		}
+	}
+}
+
+
+void
+sctp_handle_forward_tsn(struct sctp_tcb *stcb,
+                        struct sctp_forward_tsn_chunk *fwd,
+                        int *abort_flag, struct mbuf *m ,int offset)
+{
+	/* The pr-sctp fwd tsn */
+	/*
+	 * here we will perform all the data receiver side steps for
+	 * processing FwdTSN, as required in by pr-sctp draft:
+	 *
+	 * Assume we get FwdTSN(x):
+	 *
+	 * 1) update local cumTSN to x 2) try to further advance cumTSN to x +
+	 * others we have 3) examine and update re-ordering queue on
+	 * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to
+	 * report where we are.
+	 */
+	struct sctp_association *asoc;
+	uint32_t new_cum_tsn, gap;
+	unsigned int i, fwd_sz, m_size;
+	uint32_t str_seq;
+	struct sctp_stream_in *strm;
+	struct sctp_tmit_chunk *chk, *nchk;
+	struct sctp_queued_to_read *ctl, *sv;
+
+	asoc = &stcb->asoc;
+	if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) {
+		SCTPDBG(SCTP_DEBUG_INDATA1,
+			"Bad size too small/big fwd-tsn\n");
+		return;
+	}
+	m_size = (stcb->asoc.mapping_array_size << 3);
+	/*************************************************************/
+	/* 1. Here we update local cumTSN and shift the bitmap array */
+	/*************************************************************/
+	new_cum_tsn = ntohl(fwd->new_cumulative_tsn);
+
+	if (SCTP_TSN_GE(asoc->cumulative_tsn, new_cum_tsn)) {
+		/* Already got there ... */
+		return;
+	}
+	/*
+	 * now we know the new TSN is more advanced, let's find the actual
+	 * gap
+	 */
+	SCTP_CALC_TSN_TO_GAP(gap, new_cum_tsn, asoc->mapping_array_base_tsn);
+	asoc->cumulative_tsn = new_cum_tsn;
+	if (gap >= m_size) {
+		if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) {
+			struct mbuf *op_err;
+			char msg[SCTP_DIAG_INFO_LEN];
+
+			/*
+			 * out of range (of single byte chunks in the rwnd I
+			 * give out). This must be an attacker.
+			 */
+			*abort_flag = 1;
+			snprintf(msg, sizeof(msg),
+			         "New cum ack %8.8x too high, highest TSN %8.8x",
+			         new_cum_tsn, asoc->highest_tsn_inside_map);
+			op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
+			stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA+SCTP_LOC_33;
+			sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
+			return;
+		}
+		SCTP_STAT_INCR(sctps_fwdtsn_map_over);
+
+		memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size);
+		asoc->mapping_array_base_tsn = new_cum_tsn + 1;
+		asoc->highest_tsn_inside_map = new_cum_tsn;
+
+		memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.mapping_array_size);
+		asoc->highest_tsn_inside_nr_map = new_cum_tsn;
+
+		if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) {
+			sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT);
+		}
+	} else {
+		SCTP_TCB_LOCK_ASSERT(stcb);
+		for (i = 0; i <= gap; i++) {
+			if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, i) &&
+			    !SCTP_IS_TSN_PRESENT(asoc->nr_mapping_array, i)) {
+				SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, i);
+				if (SCTP_TSN_GT(asoc->mapping_array_base_tsn + i, asoc->highest_tsn_inside_nr_map)) {
+					asoc->highest_tsn_inside_nr_map = asoc->mapping_array_base_tsn + i;
+				}
+			}
+		}
+	}
+	/*************************************************************/
+	/* 2. Clear up re-assembly queue                             */
+	/*************************************************************/
+	/*
+	 * First service it if pd-api is up, just in case we can progress it
+	 * forward
+	 */
+	if (asoc->fragmented_delivery_inprogress) {
+		sctp_service_reassembly(stcb, asoc);
+	}
+	/* For each one on here see if we need to toss it */
+	/*
+	 * For now large messages held on the reasmqueue that are
+	 * complete will be tossed too. We could in theory do more
+	 * work to spin through and stop after dumping one msg aka
+	 * seeing the start of a new msg at the head, and call the
+	 * delivery function... to see if it can be delivered... But
+	 * for now we just dump everything on the queue.
+	 */
+	TAILQ_FOREACH_SAFE(chk, &asoc->reasmqueue, sctp_next, nchk) {
+		if (SCTP_TSN_GE(new_cum_tsn, chk->rec.data.TSN_seq)) {
+			/* It needs to be tossed */
+			TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
+			if (SCTP_TSN_GT(chk->rec.data.TSN_seq, asoc->tsn_last_delivered)) {
+				asoc->tsn_last_delivered = chk->rec.data.TSN_seq;
+				asoc->str_of_pdapi = chk->rec.data.stream_number;
+				asoc->ssn_of_pdapi = chk->rec.data.stream_seq;
+				asoc->fragment_flags = chk->rec.data.rcv_flags;
+			}
+			asoc->size_on_reasm_queue -= chk->send_size;
+			sctp_ucount_decr(asoc->cnt_on_reasm_queue);
+
+			/* Clear up any stream problem */
+			if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED &&
+			    SCTP_SSN_GT(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered)) {
+				/*
+				 * We must dump forward this streams
+				 * sequence number if the chunk is
+				 * not unordered that is being
+				 * skipped. There is a chance that
+				 * if the peer does not include the
+				 * last fragment in its FWD-TSN we
+				 * WILL have a problem here since
+				 * you would have a partial chunk in
+				 * queue that may not be
+				 * deliverable. Also if a Partial
+				 * delivery API as started the user
+				 * may get a partial chunk. The next
+				 * read returning a new chunk...
+				 * really ugly but I see no way
+				 * around it! Maybe a notify??
+				 */
+				asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq;
+			}
+			if (chk->data) {
+				sctp_m_freem(chk->data);
+				chk->data = NULL;
+			}
+			sctp_free_a_chunk(stcb, chk, SCTP_SO_NOT_LOCKED);
+		} else {
+			/*
+			 * Ok we have gone beyond the end of the
+			 * fwd-tsn's mark.
+			 */
+			break;
+		}
+	}
+	/*******************************************************/
+	/* 3. Update the PR-stream re-ordering queues and fix  */
+	/*    delivery issues as needed.                       */
+	/*******************************************************/
+	fwd_sz -= sizeof(*fwd);
+	if (m && fwd_sz) {
+		/* New method. */
+		unsigned int num_str;
+		struct sctp_strseq *stseq, strseqbuf;
+		offset += sizeof(*fwd);
+
+		SCTP_INP_READ_LOCK(stcb->sctp_ep);
+		num_str = fwd_sz / sizeof(struct sctp_strseq);
+		for (i = 0; i < num_str; i++) {
+			uint16_t st;
+			stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset,
+								    sizeof(struct sctp_strseq),
+								    (uint8_t *)&strseqbuf);
+			offset += sizeof(struct sctp_strseq);
+			if (stseq == NULL) {
+				break;
+			}
+			/* Convert */
+			st = ntohs(stseq->stream);
+			stseq->stream = st;
+			st = ntohs(stseq->sequence);
+			stseq->sequence = st;
+
+			/* now process */
+
+			/*
+			 * Ok we now look for the stream/seq on the read queue
+			 * where its not all delivered. If we find it we transmute the
+			 * read entry into a PDI_ABORTED.
+			 */
+			if (stseq->stream >= asoc->streamincnt) {
+				/* screwed up streams, stop!  */
+				break;
+			}
+			if ((asoc->str_of_pdapi == stseq->stream) &&
+			    (asoc->ssn_of_pdapi == stseq->sequence)) {
+				/* If this is the one we were partially delivering
+				 * now then we no longer are. Note this will change
+				 * with the reassembly re-write.
+				 */
+				asoc->fragmented_delivery_inprogress = 0;
+			}
+			sctp_flush_reassm_for_str_seq(stcb, asoc, stseq->stream, stseq->sequence);
+			TAILQ_FOREACH(ctl, &stcb->sctp_ep->read_queue, next) {
+				if ((ctl->sinfo_stream == stseq->stream) &&
+				    (ctl->sinfo_ssn == stseq->sequence)) {
+					str_seq = (stseq->stream << 16) | stseq->sequence;
+					ctl->end_added = 1;
+					ctl->pdapi_aborted = 1;
+					sv = stcb->asoc.control_pdapi;
+					stcb->asoc.control_pdapi = ctl;
+					sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION,
+					                stcb,
+					                SCTP_PARTIAL_DELIVERY_ABORTED,
+					                (void *)&str_seq,
+							SCTP_SO_NOT_LOCKED);
+					stcb->asoc.control_pdapi = sv;
+					break;
+				} else if ((ctl->sinfo_stream == stseq->stream) &&
+					   SCTP_SSN_GT(ctl->sinfo_ssn, stseq->sequence)) {
+					/* We are past our victim SSN */
+					break;
+				}
+			}
+			strm = &asoc->strmin[stseq->stream];
+			if (SCTP_SSN_GT(stseq->sequence, strm->last_sequence_delivered)) {
+				/* Update the sequence number */
+				strm->last_sequence_delivered = stseq->sequence;
+			}
+			/* now kick the stream the new way */
+                        /*sa_ignore NO_NULL_CHK*/
+			sctp_kick_prsctp_reorder_queue(stcb, strm);
+		}
+		SCTP_INP_READ_UNLOCK(stcb->sctp_ep);
+	}
+	/*
+	 * Now slide thing forward.
+	 */
+	sctp_slide_mapping_arrays(stcb);
+
+	if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
+		/* now lets kick out and check for more fragmented delivery */
+                /*sa_ignore NO_NULL_CHK*/
+		sctp_deliver_reasm_check(stcb, &stcb->asoc);
+	}
+}