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[dragonfly.git] / sys / netinet / sctputil.c

/*      $KAME: sctputil.c,v 1.36 2005/03/06 16:04:19 itojun Exp $       */
/*      $DragonFly: src/sys/netinet/sctputil.c,v 1.8 2007/04/22 01:13:14 dillon Exp $   */

/*
 * Copyright (c) 2001, 2002, 2003, 2004 Cisco Systems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Cisco Systems, Inc.
 * 4. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY CISCO SYSTEMS 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 CISCO SYSTEMS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if !(defined(__OpenBSD__) || defined(__APPLE__))
#include "opt_ipsec.h"
#endif
#if defined(__FreeBSD__) || defined(__DragonFly__)
#include "opt_compat.h"
#include "opt_inet6.h"
#include "opt_inet.h"
#if !(defined(SCTP_BASE_FREEBSD) || defined(__DragonFly__))
#include "opt_mpath.h"
#endif /* SCTP_BASE_FREEBSD || __DragonFly__ */
#endif /* FreeBSD */
#if defined(__NetBSD__)
#include "opt_inet.h"
#endif
#ifdef __APPLE__
#include <sctp.h>
#elif !defined(__OpenBSD__)
#include "opt_sctp.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/thread2.h>

#if defined(__FreeBSD__) || defined(__DragonFly__)
#include <sys/callout.h>
#else
#include <netinet/sctp_callout.h>       /* for callout_active() */
#endif

#include <net/radix.h>
#include <net/route.h>

#ifdef INET6
#ifndef __OpenBSD__
#include <sys/domain.h>
#endif
#endif

#if (defined(__FreeBSD__) && __FreeBSD_version >= 500000)
#include <sys/limits.h>
#else
#include <machine/limits.h>
#endif

#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>

#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>

#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || defined(__DragonFly_)
#include <netinet6/in6_pcb.h>
#elif defined(__OpenBSD__)
#include <netinet/in_pcb.h>
#endif

#endif /* INET6 */

#include <netinet/sctp_pcb.h>

#ifdef IPSEC
#ifndef __OpenBSD__
#include <netinet6/ipsec.h>
#include <netproto/key/key.h>
#else
#undef IPSEC
#endif
#endif /* IPSEC */

#include <netinet/sctputil.h>
#include <netinet/sctp_var.h>
#ifdef INET6
#include <netinet6/sctp6_var.h>
#endif
#include <netinet/sctp_header.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_hashdriver.h>
#include <netinet/sctp_uio.h>
#include <netinet/sctp_timer.h>
#include <netinet/sctp_crc32.h>
#include <netinet/sctp_indata.h>        /* for sctp_deliver_data() */
#define NUMBER_OF_MTU_SIZES 18

#ifdef SCTP_DEBUG
extern u_int32_t sctp_debug_on;
#endif

#ifdef SCTP_STAT_LOGGING
int sctp_cwnd_log_at=0;
int sctp_cwnd_log_rolled=0;
struct sctp_cwnd_log sctp_clog[SCTP_STAT_LOG_SIZE];

void
sctp_clr_stat_log(void)
{
        sctp_cwnd_log_at=0;
        sctp_cwnd_log_rolled=0;
}

void
sctp_log_strm_del_alt(u_int32_t tsn, u_int16_t sseq, int from)
{

        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_STRM;
        sctp_clog[sctp_cwnd_log_at].x.strlog.n_tsn = tsn;
        sctp_clog[sctp_cwnd_log_at].x.strlog.n_sseq = sseq;
        sctp_clog[sctp_cwnd_log_at].x.strlog.e_tsn = 0;
        sctp_clog[sctp_cwnd_log_at].x.strlog.e_sseq = 0;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }


}

void
sctp_log_map(uint32_t map, uint32_t cum, uint32_t high, int from)
{

        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_MAP;
        sctp_clog[sctp_cwnd_log_at].x.map.base = map;
        sctp_clog[sctp_cwnd_log_at].x.map.cum = cum;
        sctp_clog[sctp_cwnd_log_at].x.map.high = high;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_fr(uint32_t biggest_tsn, uint32_t biggest_new_tsn, uint32_t tsn,
    int from)
{

        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_FR;
        sctp_clog[sctp_cwnd_log_at].x.fr.largest_tsn = biggest_tsn;
        sctp_clog[sctp_cwnd_log_at].x.fr.largest_new_tsn = biggest_new_tsn;
        sctp_clog[sctp_cwnd_log_at].x.fr.tsn = tsn;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_strm_del(struct sctp_tmit_chunk *chk, struct sctp_tmit_chunk *poschk,
    int from)
{

        if (chk == NULL) {
                kprintf("Gak log of NULL?\n");
                return;
        }
        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_STRM;
        sctp_clog[sctp_cwnd_log_at].x.strlog.n_tsn = chk->rec.data.TSN_seq;
        sctp_clog[sctp_cwnd_log_at].x.strlog.n_sseq = chk->rec.data.stream_seq;
        if (poschk != NULL) {
                sctp_clog[sctp_cwnd_log_at].x.strlog.e_tsn =
                    poschk->rec.data.TSN_seq;
                sctp_clog[sctp_cwnd_log_at].x.strlog.e_sseq =
                    poschk->rec.data.stream_seq;
        } else {
                sctp_clog[sctp_cwnd_log_at].x.strlog.e_tsn = 0;
                sctp_clog[sctp_cwnd_log_at].x.strlog.e_sseq = 0;
        }
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_cwnd(struct sctp_nets *net, int augment, uint8_t from)
{

        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_CWND;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.net = net;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.cwnd_new_value = net->cwnd;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.inflight = net->flight_size;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.cwnd_augment = augment;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_maxburst(struct sctp_nets *net, int error, int burst, uint8_t from)
{
        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_MAXBURST;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.net = net;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.cwnd_new_value = error;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.inflight = net->flight_size;
        sctp_clog[sctp_cwnd_log_at].x.cwnd.cwnd_augment = burst;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_rwnd(uint8_t from, u_int32_t peers_rwnd , u_int32_t snd_size, u_int32_t overhead)
{
        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_RWND;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.rwnd = peers_rwnd;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.send_size = snd_size;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.overhead = overhead;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.new_rwnd = 0;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_rwnd_set(uint8_t from, u_int32_t peers_rwnd , u_int32_t flight_size, u_int32_t overhead, u_int32_t a_rwndval)
{
        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_RWND;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.rwnd = peers_rwnd;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.send_size = flight_size;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.overhead = overhead;
        sctp_clog[sctp_cwnd_log_at].x.rwnd.new_rwnd = a_rwndval;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_mbcnt(uint8_t from, u_int32_t total_oq , u_int32_t book, u_int32_t total_mbcnt_q, u_int32_t mbcnt)
{
        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_MBCNT;
        sctp_clog[sctp_cwnd_log_at].x.mbcnt.total_queue_size = total_oq;
        sctp_clog[sctp_cwnd_log_at].x.mbcnt.size_change  = book;
        sctp_clog[sctp_cwnd_log_at].x.mbcnt.total_queue_mb_size = total_mbcnt_q;
        sctp_clog[sctp_cwnd_log_at].x.mbcnt.mbcnt_change = mbcnt;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

void
sctp_log_block(uint8_t from, struct socket *so, struct sctp_association *asoc)
{

        sctp_clog[sctp_cwnd_log_at].from = (u_int8_t)from;
        sctp_clog[sctp_cwnd_log_at].event_type = (u_int8_t)SCTP_LOG_EVENT_BLOCK;
        sctp_clog[sctp_cwnd_log_at].x.blk.maxmb = (u_int16_t)(so->so_snd.ssb_mbmax/1024);
        sctp_clog[sctp_cwnd_log_at].x.blk.onmb = asoc->total_output_mbuf_queue_size;
        sctp_clog[sctp_cwnd_log_at].x.blk.maxsb = (u_int16_t)(so->so_snd.ssb_hiwat/1024);
        sctp_clog[sctp_cwnd_log_at].x.blk.onsb = asoc->total_output_queue_size;
        sctp_clog[sctp_cwnd_log_at].x.blk.send_sent_qcnt = (u_int16_t)(asoc->send_queue_cnt + asoc->sent_queue_cnt);
        sctp_clog[sctp_cwnd_log_at].x.blk.stream_qcnt = (u_int16_t)asoc->stream_queue_cnt;
        sctp_cwnd_log_at++;
        if (sctp_cwnd_log_at >= SCTP_STAT_LOG_SIZE) {
                sctp_cwnd_log_at = 0;
                sctp_cwnd_log_rolled = 1;
        }
}

int
sctp_fill_stat_log(struct mbuf *m)
{
        struct sctp_cwnd_log_req *req;
        int size_limit, num, i, at, cnt_out=0;

        if (m == NULL)
                return (EINVAL);

        size_limit = (m->m_len - sizeof(struct sctp_cwnd_log_req));
        if (size_limit < sizeof(struct sctp_cwnd_log)) {
                return (EINVAL);
        }
        req = mtod(m, struct sctp_cwnd_log_req *);
        num = size_limit/sizeof(struct sctp_cwnd_log);
        if (sctp_cwnd_log_rolled) {
                req->num_in_log = SCTP_STAT_LOG_SIZE;
        } else {
                req->num_in_log = sctp_cwnd_log_at;
                /* if the log has not rolled, we don't
                 * let you have old data.
                 */
                if (req->end_at > sctp_cwnd_log_at) {
                        req->end_at = sctp_cwnd_log_at;
                }
        }
        if ((num < SCTP_STAT_LOG_SIZE) &&
            ((sctp_cwnd_log_rolled) || (sctp_cwnd_log_at > num))) {
                /* we can't return all of it */
                if (((req->start_at == 0) && (req->end_at == 0)) ||
                    (req->start_at >= SCTP_STAT_LOG_SIZE) ||
                    (req->end_at >= SCTP_STAT_LOG_SIZE)) {
                        /* No user request or user is wacked. */
                        req->num_ret = num;
                        req->end_at = sctp_cwnd_log_at - 1;
                        if ((sctp_cwnd_log_at - num) < 0) {
                                int cc;
                                cc = num - sctp_cwnd_log_at;
                                req->start_at = SCTP_STAT_LOG_SIZE - cc;
                        } else {
                                req->start_at = sctp_cwnd_log_at - num;
                        }
                } else {
                        /* a user request */
                        int cc;
                        if (req->start_at > req->end_at) {
                                cc = (SCTP_STAT_LOG_SIZE - req->start_at) +
                                    (req->end_at + 1);
                        } else {

                                cc = req->end_at - req->start_at;
                        }
                        if (cc < num) {
                                num = cc;
                        }
                        req->num_ret = num;
                }
        } else {
                /* We can return all  of it */
                req->start_at = 0;
                req->end_at = sctp_cwnd_log_at - 1;
                req->num_ret = sctp_cwnd_log_at;
        }
        for (i = 0, at = req->start_at; i < req->num_ret; i++) {
                req->log[i] = sctp_clog[at];
                cnt_out++;
                at++;
                if (at >= SCTP_STAT_LOG_SIZE)
                        at = 0;
        }
        m->m_len = (cnt_out * sizeof(struct sctp_cwnd_log_req)) + sizeof(struct sctp_cwnd_log_req);
        return (0);
}

#endif

#ifdef SCTP_AUDITING_ENABLED
u_int8_t sctp_audit_data[SCTP_AUDIT_SIZE][2];
static int sctp_audit_indx = 0;

static void
sctp_print_audit_report(void)
{
        int i;
        int cnt;
        cnt = 0;
        for (i=sctp_audit_indx;i<SCTP_AUDIT_SIZE;i++) {
                if ((sctp_audit_data[i][0] == 0xe0) &&
                    (sctp_audit_data[i][1] == 0x01)) {
                        cnt = 0;
                        kprintf("\n");
                } else if (sctp_audit_data[i][0] == 0xf0) {
                        cnt = 0;
                        kprintf("\n");
                } else if ((sctp_audit_data[i][0] == 0xc0) &&
                    (sctp_audit_data[i][1] == 0x01)) {
                        kprintf("\n");
                        cnt = 0;
                }
                kprintf("%2.2x%2.2x ", (uint32_t)sctp_audit_data[i][0],
                    (uint32_t)sctp_audit_data[i][1]);
                cnt++;
                if ((cnt % 14) == 0)
                        kprintf("\n");
        }
        for (i=0;i<sctp_audit_indx;i++) {
                if ((sctp_audit_data[i][0] == 0xe0) &&
                    (sctp_audit_data[i][1] == 0x01)) {
                        cnt = 0;
                        kprintf("\n");
                } else if (sctp_audit_data[i][0] == 0xf0) {
                        cnt = 0;
                        kprintf("\n");
                } else if ((sctp_audit_data[i][0] == 0xc0) &&
                         (sctp_audit_data[i][1] == 0x01)) {
                        kprintf("\n");
                        cnt = 0;
                }
                kprintf("%2.2x%2.2x ", (uint32_t)sctp_audit_data[i][0],
                    (uint32_t)sctp_audit_data[i][1]);
                cnt++;
                if ((cnt % 14) == 0)
                        kprintf("\n");
        }
        kprintf("\n");
}

void
sctp_auditing(int from, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
              struct sctp_nets *net)
{
        int resend_cnt, tot_out, rep, tot_book_cnt;
        struct sctp_nets *lnet;
        struct sctp_tmit_chunk *chk;

        sctp_audit_data[sctp_audit_indx][0] = 0xAA;
        sctp_audit_data[sctp_audit_indx][1] = 0x000000ff & from;
        sctp_audit_indx++;
        if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                sctp_audit_indx = 0;
        }
        if (inp == NULL) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0x01;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                return;
        }
        if (stcb == NULL) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0x02;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                return;
        }
        sctp_audit_data[sctp_audit_indx][0] = 0xA1;
        sctp_audit_data[sctp_audit_indx][1] =
            (0x000000ff & stcb->asoc.sent_queue_retran_cnt);
        sctp_audit_indx++;
        if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                sctp_audit_indx = 0;
        }
        rep = 0;
        tot_book_cnt = 0;
        resend_cnt = tot_out = 0;
        TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                if (chk->sent == SCTP_DATAGRAM_RESEND) {
                        resend_cnt++;
                } else if (chk->sent < SCTP_DATAGRAM_RESEND) {
                        tot_out += chk->book_size;
                        tot_book_cnt++;
                }
        }
        if (resend_cnt != stcb->asoc.sent_queue_retran_cnt) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0xA1;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                kprintf("resend_cnt:%d asoc-tot:%d\n",
                    resend_cnt, stcb->asoc.sent_queue_retran_cnt);
                rep = 1;
                stcb->asoc.sent_queue_retran_cnt = resend_cnt;
                sctp_audit_data[sctp_audit_indx][0] = 0xA2;
                sctp_audit_data[sctp_audit_indx][1] =
                    (0x000000ff & stcb->asoc.sent_queue_retran_cnt);
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
        }
        if (tot_out != stcb->asoc.total_flight) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0xA2;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                rep = 1;
                kprintf("tot_flt:%d asoc_tot:%d\n", tot_out,
                    (int)stcb->asoc.total_flight);
                stcb->asoc.total_flight = tot_out;
        }
        if (tot_book_cnt != stcb->asoc.total_flight_count) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0xA5;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                rep = 1;
                kprintf("tot_flt_book:%d\n", tot_book);

                stcb->asoc.total_flight_count = tot_book_cnt;
        }
        tot_out = 0;
        TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
                tot_out += lnet->flight_size;
        }
        if (tot_out != stcb->asoc.total_flight) {
                sctp_audit_data[sctp_audit_indx][0] = 0xAF;
                sctp_audit_data[sctp_audit_indx][1] = 0xA3;
                sctp_audit_indx++;
                if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                        sctp_audit_indx = 0;
                }
                rep = 1;
                kprintf("real flight:%d net total was %d\n",
                    stcb->asoc.total_flight, tot_out);
                /* now corrective action */
                TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
                        tot_out = 0;
                        TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                                if ((chk->whoTo == lnet) &&
                                    (chk->sent < SCTP_DATAGRAM_RESEND)) {
                                        tot_out += chk->book_size;
                                }
                        }
                        if (lnet->flight_size != tot_out) {
                                kprintf("net:%x flight was %d corrected to %d\n",
                                    (uint32_t)lnet, lnet->flight_size, tot_out);
                                lnet->flight_size = tot_out;
                        }

                }
        }

        if (rep) {
                sctp_print_audit_report();
        }
}

void
sctp_audit_log(u_int8_t ev, u_int8_t fd)
{
        crit_enter();
        sctp_audit_data[sctp_audit_indx][0] = ev;
        sctp_audit_data[sctp_audit_indx][1] = fd;
        sctp_audit_indx++;
        if (sctp_audit_indx >= SCTP_AUDIT_SIZE) {
                sctp_audit_indx = 0;
        }
        crit_exit();
}

#endif

/*
 * a list of sizes based on typical mtu's, used only if next hop
 * size not returned.
 */
static int sctp_mtu_sizes[] = {
        68,
        296,
        508,
        512,
        544,
        576,
        1006,
        1492,
        1500,
        1536,
        2002,
        2048,
        4352,
        4464,
        8166,
        17914,
        32000,
        65535
};

int
find_next_best_mtu(int totsz)
{
        int i, perfer;
        /*
         * if we are in here we must find the next best fit based on the
         * size of the dg that failed to be sent.
         */
        perfer = 0;
        for (i = 0; i < NUMBER_OF_MTU_SIZES; i++) {
                if (totsz < sctp_mtu_sizes[i]) {
                        perfer = i - 1;
                        if (perfer < 0)
                                perfer = 0;
                        break;
                }
        }
        return (sctp_mtu_sizes[perfer]);
}

void
sctp_fill_random_store(struct sctp_pcb *m)
{
        /*
         * Here we use the MD5/SHA-1 to hash with our good randomNumbers
         * and our counter. The result becomes our good random numbers and
         * we then setup to give these out. Note that we do no lockig
         * to protect this. This is ok, since if competing folks call
         * this we will get more gobbled gook in the random store whic
         * is what we want. There is a danger that two guys will use
         * the same random numbers, but thats ok too since that
         * is random as well :->
         */
        m->store_at = 0;
        sctp_hash_digest((char *)m->random_numbers, sizeof(m->random_numbers),
                         (char *)&m->random_counter, sizeof(m->random_counter),
                         (char *)m->random_store);
        m->random_counter++;
}

uint32_t
sctp_select_initial_TSN(struct sctp_pcb *m)
{
        /*
         * A true implementation should use random selection process to
         * get the initial stream sequence number, using RFC1750 as a
         * good guideline
         */
        u_long x, *xp;
        uint8_t *p;

        if (m->initial_sequence_debug != 0) {
                u_int32_t ret;
                ret = m->initial_sequence_debug;
                m->initial_sequence_debug++;
                return (ret);
        }
        if ((m->store_at+sizeof(u_long)) > SCTP_SIGNATURE_SIZE) {
                /* Refill the random store */
                sctp_fill_random_store(m);
        }
        p = &m->random_store[(int)m->store_at];
        xp = (u_long *)p;
        x = *xp;
        m->store_at += sizeof(u_long);
        return (x);
}

u_int32_t
sctp_select_a_tag(struct sctp_inpcb *m)
{
        u_long x, not_done;
        struct timeval now;

        SCTP_GETTIME_TIMEVAL(&now);
        not_done = 1;
        while (not_done) {
                x = sctp_select_initial_TSN(&m->sctp_ep);
                if (x == 0) {
                        /* we never use 0 */
                        continue;
                }
                if (sctp_is_vtag_good(m, x, &now)) {
                        not_done = 0;
                }
        }
        return (x);
}


int
sctp_init_asoc(struct sctp_inpcb *m, struct sctp_association *asoc,
               int for_a_init, uint32_t override_tag )
{
        /*
         * Anything set to zero is taken care of by the allocation
         * routine's bzero
         */

        /*
         * Up front select what scoping to apply on addresses I tell my peer
         * Not sure what to do with these right now, we will need to come up
         * with a way to set them. We may need to pass them through from the
         * caller in the sctp_aloc_assoc() function.
         */
        int i;
        /* init all variables to a known value.*/
        asoc->state = SCTP_STATE_INUSE;
        asoc->max_burst = m->sctp_ep.max_burst;
        asoc->heart_beat_delay = m->sctp_ep.sctp_timeoutticks[SCTP_TIMER_HEARTBEAT];
        asoc->cookie_life = m->sctp_ep.def_cookie_life;

        if (override_tag) {
                asoc->my_vtag = override_tag;
        } else {
                asoc->my_vtag = sctp_select_a_tag(m);
        }
        asoc->asconf_seq_out = asoc->str_reset_seq_out = asoc->init_seq_number = asoc->sending_seq =
                sctp_select_initial_TSN(&m->sctp_ep);
        asoc->t3timeout_highest_marked = asoc->asconf_seq_out;
        /* we are opptimisitic here */
        asoc->peer_supports_asconf = 1;
        asoc->peer_supports_asconf_setprim = 1;
        asoc->peer_supports_pktdrop = 1;

        asoc->sent_queue_retran_cnt = 0;
        /* This will need to be adjusted */
        asoc->last_cwr_tsn = asoc->init_seq_number - 1;
        asoc->last_acked_seq = asoc->init_seq_number - 1;
        asoc->advanced_peer_ack_point = asoc->last_acked_seq;
        asoc->asconf_seq_in = asoc->last_acked_seq;

        /* here we are different, we hold the next one we expect */
        asoc->str_reset_seq_in = asoc->last_acked_seq + 1;

        asoc->initial_init_rto_max = m->sctp_ep.initial_init_rto_max;
        asoc->initial_rto = m->sctp_ep.initial_rto;

        asoc->max_init_times = m->sctp_ep.max_init_times;
        asoc->max_send_times = m->sctp_ep.max_send_times;
        asoc->def_net_failure = m->sctp_ep.def_net_failure;

        /* ECN Nonce initialization */
        asoc->ecn_nonce_allowed = 0;
        asoc->receiver_nonce_sum = 1;
        asoc->nonce_sum_expect_base = 1;
        asoc->nonce_sum_check = 1;
        asoc->nonce_resync_tsn = 0;
        asoc->nonce_wait_for_ecne = 0;
        asoc->nonce_wait_tsn = 0;

        if (m->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                struct in6pcb *inp6;


                /* Its a V6 socket */
                inp6 = (struct in6pcb *)m;
                asoc->ipv6_addr_legal = 1;
                /* Now look at the binding flag to see if V4 will be legal */
        if (
#if defined(__OpenBSD__)
                (0) /* we always do dual bind */
#elif defined (__NetBSD__)
                (inp6->in6p_flags & IN6P_IPV6_V6ONLY)
#else
                (inp6->inp_flags & IN6P_IPV6_V6ONLY)
#endif
             == 0) {
                        asoc->ipv4_addr_legal = 1;
                } else {
                        /* V4 addresses are NOT legal on the association */
                        asoc->ipv4_addr_legal = 0;
                }
        } else {
                /* Its a V4 socket, no - V6 */
                asoc->ipv4_addr_legal = 1;
                asoc->ipv6_addr_legal = 0;
        }


        asoc->my_rwnd = max(m->sctp_socket->so_rcv.ssb_hiwat, SCTP_MINIMAL_RWND);
        asoc->peers_rwnd = m->sctp_socket->so_rcv.ssb_hiwat;

        asoc->smallest_mtu = m->sctp_frag_point;
        asoc->minrto = m->sctp_ep.sctp_minrto;
        asoc->maxrto = m->sctp_ep.sctp_maxrto;

        LIST_INIT(&asoc->sctp_local_addr_list);
        TAILQ_INIT(&asoc->nets);
        TAILQ_INIT(&asoc->pending_reply_queue);
        asoc->last_asconf_ack_sent = NULL;
        /* Setup to fill the hb random cache at first HB */
        asoc->hb_random_idx = 4;

        asoc->sctp_autoclose_ticks = m->sctp_ep.auto_close_time;

        /*
         * Now the stream parameters, here we allocate space for all
         * streams that we request by default.
         */
        asoc->streamoutcnt = asoc->pre_open_streams =
            m->sctp_ep.pre_open_stream_count;
        MALLOC(asoc->strmout, struct sctp_stream_out *, asoc->streamoutcnt *
            sizeof(struct sctp_stream_out), M_PCB, M_NOWAIT);
        if (asoc->strmout == NULL) {
                /* big trouble no memory */
                return (ENOMEM);
        }
        for (i = 0; i < asoc->streamoutcnt; i++) {
                /*
                 * inbound side must be set to 0xffff,
                 * also NOTE when we get the INIT-ACK back (for INIT sender)
                 * we MUST reduce the count (streamoutcnt) but first check
                 * if we sent to any of the upper streams that were dropped
                 * (if some were). Those that were dropped must be notified
                 * to the upper layer as failed to send.
                 */
                asoc->strmout[i].next_sequence_sent = 0x0;
                TAILQ_INIT(&asoc->strmout[i].outqueue);
                asoc->strmout[i].stream_no = i;
                asoc->strmout[i].next_spoke.tqe_next = 0;
                asoc->strmout[i].next_spoke.tqe_prev = 0;
        }
        /* Now the mapping array */
        asoc->mapping_array_size = SCTP_INITIAL_MAPPING_ARRAY;
#ifdef __NetBSD__
        MALLOC(asoc->mapping_array, u_int8_t *, SCTP_INITIAL_MAPPING_ARRAY,
               M_PCB, M_NOWAIT);
#else
        MALLOC(asoc->mapping_array, u_int8_t *, asoc->mapping_array_size,
               M_PCB, M_NOWAIT);
#endif
        if (asoc->mapping_array == NULL) {
                FREE(asoc->strmout, M_PCB);
                return (ENOMEM);
        }
        memset(asoc->mapping_array, 0, asoc->mapping_array_size);
        /* Now the init of the other outqueues */
        TAILQ_INIT(&asoc->out_wheel);
        TAILQ_INIT(&asoc->control_send_queue);
        TAILQ_INIT(&asoc->send_queue);
        TAILQ_INIT(&asoc->sent_queue);
        TAILQ_INIT(&asoc->reasmqueue);
        TAILQ_INIT(&asoc->delivery_queue);
        asoc->max_inbound_streams = m->sctp_ep.max_open_streams_intome;

        TAILQ_INIT(&asoc->asconf_queue);
        return (0);
}

int
sctp_expand_mapping_array(struct sctp_association *asoc)
{
        /* mapping array needs to grow */
        u_int8_t *new_array;
        uint16_t new_size;

        new_size = asoc->mapping_array_size + SCTP_MAPPING_ARRAY_INCR;
#ifdef __NetBSD__
        MALLOC(new_array, u_int8_t *, asoc->mapping_array_size
                + SCTP_MAPPING_ARRAY_INCR, M_PCB, M_NOWAIT);
#else
        MALLOC(new_array, u_int8_t *, new_size, M_PCB, M_NOWAIT);
#endif
        if (new_array == NULL) {
                /* can't get more, forget it */
                kprintf("No memory for expansion of SCTP mapping array %d\n",
                       new_size);
                return (-1);
        }
        memset(new_array, 0, new_size);
        memcpy(new_array, asoc->mapping_array, asoc->mapping_array_size);
        FREE(asoc->mapping_array, M_PCB);
        asoc->mapping_array = new_array;
        asoc->mapping_array_size = new_size;
        return (0);
}

static void
sctp_timeout_handler(void *t)
{
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;
        struct sctp_nets *net;
        struct sctp_timer *tmr;
        int did_output, typ;
#if defined(__APPLE__)
        boolean_t funnel_state;

        /* get BSD kernel funnel/mutex */
        funnel_state = thread_funnel_set(network_flock, TRUE);
#endif

        crit_enter();
        tmr = (struct sctp_timer *)t;
        inp = (struct sctp_inpcb *)tmr->ep;
        stcb = (struct sctp_tcb *)tmr->tcb;
        net = (struct sctp_nets *)tmr->net;
        did_output = 1;


#ifdef SCTP_AUDITING_ENABLED
        sctp_audit_log(0xF0, (u_int8_t)tmr->type);
        sctp_auditing(3, inp, stcb, net);
#endif
        sctp_pegs[SCTP_TIMERS_EXP]++;

        if (inp == NULL) {
                return;
        }

        SCTP_INP_WLOCK(inp);
        if (inp->sctp_socket == 0) {
                crit_exit();
#if defined(__APPLE__)
                /* release BSD kernel funnel/mutex */
                thread_funnel_set(network_flock, FALSE);
#endif
                SCTP_INP_WUNLOCK(inp);
                return;
        }
        if (stcb) {
                if (stcb->asoc.state == 0) {
                        crit_exit();
#if defined(__APPLE__)
                        /* release BSD kernel funnel/mutex */
                        thread_funnel_set(network_flock, FALSE);
#endif
                        SCTP_INP_WUNLOCK(inp);
                        return;
                }
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                kprintf("Timer type %d goes off\n", tmr->type);
        }
#endif /* SCTP_DEBUG */
#ifndef __NetBSD__
        if (!callout_active(&tmr->timer)) {
                crit_exit();
#if defined(__APPLE__)
                /* release BSD kernel funnel/mutex */
                thread_funnel_set(network_flock, FALSE);
#endif
                SCTP_INP_WUNLOCK(inp);
                return;
        }
#endif
#if defined(__APPLE__)
        /* clear the callout pending status here */
        callout_stop(&tmr->timer);
#endif
        if (stcb) {
                SCTP_TCB_LOCK(stcb);
        }
        SCTP_INP_INCR_REF(inp);
        SCTP_INP_WUNLOCK(inp);

        typ = tmr->type;
        switch (tmr->type) {
        case SCTP_TIMER_TYPE_ITERATOR:
        {
                struct sctp_iterator *it;
                it = (struct sctp_iterator *)inp;
                sctp_iterator_timer(it);
        }
        break;
        /* call the handler for the appropriate timer type */
        case SCTP_TIMER_TYPE_SEND:
                sctp_pegs[SCTP_TMIT_TIMER]++;
                stcb->asoc.num_send_timers_up--;
                if (stcb->asoc.num_send_timers_up < 0) {
                        stcb->asoc.num_send_timers_up = 0;
                }
                if (sctp_t3rxt_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */

                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 1);
                if ((stcb->asoc.num_send_timers_up == 0) &&
                    (stcb->asoc.sent_queue_cnt > 0)
                        ) {
                        struct sctp_tmit_chunk *chk;
                        /*
                         * safeguard. If there on some on the sent queue
                         * somewhere but no timers running something is
                         * wrong... so we start a timer on the first chunk
                         * on the send queue on whatever net it is sent to.
                         */
                        sctp_pegs[SCTP_T3_SAFEGRD]++;
                        chk = TAILQ_FIRST(&stcb->asoc.sent_queue);
                        sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb,
                                         chk->whoTo);
                }
                break;
        case SCTP_TIMER_TYPE_INIT:
                if (sctp_t1init_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
                /* We do output but not here */
                did_output = 0;
                break;
        case SCTP_TIMER_TYPE_RECV:
                sctp_pegs[SCTP_RECV_TIMER]++;
                sctp_send_sack(stcb);
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 4);
                break;
        case SCTP_TIMER_TYPE_SHUTDOWN:
                if (sctp_shutdown_timer(inp, stcb, net) ) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 5);
                break;
        case SCTP_TIMER_TYPE_HEARTBEAT:
                if (sctp_heartbeat_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 6);
                break;
        case SCTP_TIMER_TYPE_COOKIE:
                if (sctp_cookie_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 1);
                break;
        case SCTP_TIMER_TYPE_NEWCOOKIE:
        {
                struct timeval tv;
                int i, secret;
                SCTP_GETTIME_TIMEVAL(&tv);
                SCTP_INP_WLOCK(inp);
                inp->sctp_ep.time_of_secret_change = tv.tv_sec;
                inp->sctp_ep.last_secret_number =
                        inp->sctp_ep.current_secret_number;
                inp->sctp_ep.current_secret_number++;
                if (inp->sctp_ep.current_secret_number >=
                    SCTP_HOW_MANY_SECRETS) {
                        inp->sctp_ep.current_secret_number = 0;
                }
                secret = (int)inp->sctp_ep.current_secret_number;
                for (i = 0; i < SCTP_NUMBER_OF_SECRETS; i++) {
                        inp->sctp_ep.secret_key[secret][i] =
                                sctp_select_initial_TSN(&inp->sctp_ep);
                }
                SCTP_INP_WUNLOCK(inp);
                sctp_timer_start(SCTP_TIMER_TYPE_NEWCOOKIE, inp, stcb, net);
        }
        did_output = 0;
        break;
        case SCTP_TIMER_TYPE_PATHMTURAISE:
                sctp_pathmtu_timer(inp, stcb, net);
                did_output = 0;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNACK:
                if (sctp_shutdownack_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 7);
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNGUARD:
                sctp_abort_an_association(inp, stcb,
                                          SCTP_SHUTDOWN_GUARD_EXPIRES, NULL);
                /* no need to unlock on tcb its gone */
                goto out_decr;
                break;

        case SCTP_TIMER_TYPE_STRRESET:
                if (sctp_strreset_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
                sctp_chunk_output(inp, stcb, 9);
                break;

        case SCTP_TIMER_TYPE_ASCONF:
                if (sctp_asconf_timer(inp, stcb, net)) {
                        /* no need to unlock on tcb its gone */
                        goto out_decr;
                }
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, inp, stcb, net);
#endif
                sctp_chunk_output(inp, stcb, 8);
                break;

        case SCTP_TIMER_TYPE_AUTOCLOSE:
                sctp_autoclose_timer(inp, stcb, net);
                sctp_chunk_output(inp, stcb, 10);
                did_output = 0;
                break;
        case SCTP_TIMER_TYPE_INPKILL:
                /* special case, take away our
                 * increment since WE are the killer
                 */
                SCTP_INP_WLOCK(inp);
                SCTP_INP_DECR_REF(inp);
                SCTP_INP_WUNLOCK(inp);
                sctp_timer_stop(SCTP_TIMER_TYPE_INPKILL, inp, NULL, NULL);
                sctp_inpcb_free(inp, 1);
                goto out_no_decr;
                break;
        default:
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                        kprintf("sctp_timeout_handler:unknown timer %d\n",
                               tmr->type);
                }
#endif /* SCTP_DEBUG */
                break;
        };
#ifdef SCTP_AUDITING_ENABLED
        sctp_audit_log(0xF1, (u_int8_t)tmr->type);
        sctp_auditing(5, inp, stcb, net);
#endif
        if (did_output) {
                /*
                 * Now we need to clean up the control chunk chain if an
                 * ECNE is on it. It must be marked as UNSENT again so next
                 * call will continue to send it until such time that we get
                 * a CWR, to remove it. It is, however, less likely that we
                 * will find a ecn echo on the chain though.
                 */
                sctp_fix_ecn_echo(&stcb->asoc);
        }
        if (stcb) {
                SCTP_TCB_UNLOCK(stcb);
        }
 out_decr:
        SCTP_INP_WLOCK(inp);
        SCTP_INP_DECR_REF(inp);
        SCTP_INP_WUNLOCK(inp);

 out_no_decr:

#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                kprintf("Timer now complete (type %d)\n", typ);
        }
#endif /* SCTP_DEBUG */

        crit_exit();
#if defined(__APPLE__)
        /* release BSD kernel funnel/mutex */
        thread_funnel_set(network_flock, FALSE);
#endif
}

int
sctp_timer_start(int t_type, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    struct sctp_nets *net)
{
        int to_ticks;
        struct sctp_timer *tmr;

        if (inp == NULL)
                return (EFAULT);

        to_ticks = 0;

        tmr = NULL;
        switch (t_type) {
        case SCTP_TIMER_TYPE_ITERATOR:
        {
                struct sctp_iterator *it;
                it = (struct sctp_iterator *)inp;
                tmr = &it->tmr;
                to_ticks = SCTP_ITERATOR_TICKS;
        }
        break;
        case SCTP_TIMER_TYPE_SEND:
                /* Here we use the RTO timer */
        {
                int rto_val;
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                if (net->RTO == 0) {
                        rto_val = stcb->asoc.initial_rto;
                } else {
                        rto_val = net->RTO;
                }
                to_ticks = MSEC_TO_TICKS(rto_val);
        }
        break;
        case SCTP_TIMER_TYPE_INIT:
                /*
                 * Here we use the INIT timer default
                 * usually about 1 minute.
                 */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                break;
        case SCTP_TIMER_TYPE_RECV:
                /*
                 * Here we use the Delayed-Ack timer value from the inp
                 * ususually about 200ms.
                 */
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.dack_timer;
                to_ticks = inp->sctp_ep.sctp_timeoutticks[SCTP_TIMER_RECV];
                break;
        case SCTP_TIMER_TYPE_SHUTDOWN:
                /* Here we use the RTO of the destination. */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }

                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_HEARTBEAT:
                /*
                 * the net is used here so that we can add in the RTO.
                 * Even though we use a different timer. We also add the
                 * HB timer PLUS a random jitter.
                 */
                if (stcb == NULL) {
                        return (EFAULT);
                }
                {
                        uint32_t rndval;
                        uint8_t this_random;
                        int cnt_of_unconf=0;
                        struct sctp_nets *lnet;

                        TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
                                if (lnet->dest_state & SCTP_ADDR_UNCONFIRMED) {
                                        cnt_of_unconf++;
                                }
                        }
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                                kprintf("HB timer to start unconfirmed:%d hb_delay:%d\n",
                                       cnt_of_unconf, stcb->asoc.heart_beat_delay);
                        }
#endif
                        if (stcb->asoc.hb_random_idx > 3) {
                                rndval = sctp_select_initial_TSN(&inp->sctp_ep);
                                memcpy(stcb->asoc.hb_random_values, &rndval,
                                       sizeof(stcb->asoc.hb_random_values));
                                this_random = stcb->asoc.hb_random_values[0];
                                stcb->asoc.hb_random_idx = 0;
                                stcb->asoc.hb_ect_randombit = 0;
                        } else {
                                this_random = stcb->asoc.hb_random_values[stcb->asoc.hb_random_idx];
                                stcb->asoc.hb_random_idx++;
                                stcb->asoc.hb_ect_randombit = 0;
                        }
                        /*
                         * this_random will be 0 - 256 ms
                         * RTO is in ms.
                         */
                        if ((stcb->asoc.heart_beat_delay == 0) &&
                            (cnt_of_unconf == 0)) {
                                /* no HB on this inp after confirmations */
                                return (0);
                        }
                        if (net) {
                                struct sctp_nets *lnet;
                                int delay;
                                delay = stcb->asoc.heart_beat_delay;
                                TAILQ_FOREACH(lnet, &stcb->asoc.nets, sctp_next) {
                                        if ((lnet->dest_state & SCTP_ADDR_UNCONFIRMED) &&
                                            ((lnet->dest_state & SCTP_ADDR_OUT_OF_SCOPE) == 0) &&
                                            (lnet->dest_state & SCTP_ADDR_REACHABLE)) {
                                            delay = 0;
                                        }
                                }
                                if (net->RTO == 0) {
                                        /* Never been checked */
                                        to_ticks = this_random + stcb->asoc.initial_rto + delay;
                                } else {
                                        /* set rto_val to the ms */
                                        to_ticks = delay + net->RTO + this_random;
                                }
                        } else {
                                if (cnt_of_unconf) {
                                        to_ticks = this_random + stcb->asoc.initial_rto;
                                } else {
                                        to_ticks = stcb->asoc.heart_beat_delay + this_random + stcb->asoc.initial_rto;
                                }
                        }
                        /*
                         * Now we must convert the to_ticks that are now in
                         * ms to ticks.
                         */
                        to_ticks *= hz;
                        to_ticks /= 1000;
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                                kprintf("Timer to expire in %d ticks\n", to_ticks);
                        }
#endif
                        tmr = &stcb->asoc.hb_timer;
                }
                break;
        case SCTP_TIMER_TYPE_COOKIE:
                /*
                 * Here we can use the RTO timer from the network since
                 * one RTT was compelete. If a retran happened then we will
                 * be using the RTO initial value.
                 */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_NEWCOOKIE:
                /*
                 * nothing needed but the endpoint here
                 * ususually about 60 minutes.
                 */
                tmr = &inp->sctp_ep.signature_change;
                to_ticks = inp->sctp_ep.sctp_timeoutticks[SCTP_TIMER_SIGNATURE];
                break;
        case SCTP_TIMER_TYPE_INPKILL:
                /*
                 * The inp is setup to die. We re-use the
                 * signature_chage timer since that has
                 * stopped and we are in the GONE state.
                 */
                tmr = &inp->sctp_ep.signature_change;
                to_ticks = (SCTP_INP_KILL_TIMEOUT * hz) / 1000;
                break;
        case SCTP_TIMER_TYPE_PATHMTURAISE:
                /*
                 * Here we use the value found in the EP for PMTU
                 * ususually about 10 minutes.
                 */
                if (stcb == NULL) {
                        return (EFAULT);
                }
                if (net == NULL) {
                        return (EFAULT);
                }
                to_ticks = inp->sctp_ep.sctp_timeoutticks[SCTP_TIMER_PMTU];
                tmr = &net->pmtu_timer;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNACK:
                /* Here we use the RTO of the destination */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNGUARD:
                /*
                 * Here we use the endpoints shutdown guard timer
                 * usually about 3 minutes.
                 */
                if (stcb == NULL) {
                        return (EFAULT);
                }
                to_ticks = inp->sctp_ep.sctp_timeoutticks[SCTP_TIMER_MAXSHUTDOWN];
                tmr = &stcb->asoc.shut_guard_timer;
                break;
        case SCTP_TIMER_TYPE_STRRESET:
                /*
                 * Here the timer comes from the inp
                 * but its value is from the RTO.
                 */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                tmr = &stcb->asoc.strreset_timer;
                break;

        case SCTP_TIMER_TYPE_ASCONF:
                /*
                 * Here the timer comes from the inp
                 * but its value is from the RTO.
                 */
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                if (net->RTO == 0) {
                        to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto);
                } else {
                        to_ticks = MSEC_TO_TICKS(net->RTO);
                }
                tmr = &stcb->asoc.asconf_timer;
                break;
        case SCTP_TIMER_TYPE_AUTOCLOSE:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                if (stcb->asoc.sctp_autoclose_ticks == 0) {
                        /* Really an error since stcb is NOT set to autoclose */
                        return (0);
                }
                to_ticks = stcb->asoc.sctp_autoclose_ticks;
                tmr = &stcb->asoc.autoclose_timer;
                break;
        default:
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                        kprintf("sctp_timer_start:Unknown timer type %d\n",
                               t_type);
                }
#endif /* SCTP_DEBUG */
                return (EFAULT);
                break;
        };
        if ((to_ticks <= 0) || (tmr == NULL)) {
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                        kprintf("sctp_timer_start:%d:software error to_ticks:%d tmr:%p not set ??\n",
                               t_type, to_ticks, tmr);
                }
#endif /* SCTP_DEBUG */
                return (EFAULT);
        }
        if (callout_pending(&tmr->timer)) {
                /*
                 * we do NOT allow you to have it already running.
                 * if it is we leave the current one up unchanged
                 */
                return (EALREADY);
        }
        /* At this point we can proceed */
        if (t_type == SCTP_TIMER_TYPE_SEND) {
                stcb->asoc.num_send_timers_up++;
        }
        tmr->type = t_type;
        tmr->ep = (void *)inp;
        tmr->tcb = (void *)stcb;
        tmr->net = (void *)net;
        callout_reset(&tmr->timer, to_ticks, sctp_timeout_handler, tmr);
        return (0);
}

int
sctp_timer_stop(int t_type, struct sctp_inpcb *inp, struct sctp_tcb *stcb,
                struct sctp_nets *net)
{
        struct sctp_timer *tmr;

        if (inp == NULL)
                return (EFAULT);

        tmr = NULL;
        switch (t_type) {
        case SCTP_TIMER_TYPE_ITERATOR:
        {
                struct sctp_iterator *it;
                it = (struct sctp_iterator *)inp;
                tmr = &it->tmr;
        }
        break;
        case SCTP_TIMER_TYPE_SEND:
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_INIT:
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_RECV:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.dack_timer;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWN:
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_HEARTBEAT:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.hb_timer;
                break;
        case SCTP_TIMER_TYPE_COOKIE:
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_NEWCOOKIE:
                /* nothing needed but the endpoint here */
                tmr = &inp->sctp_ep.signature_change;
                /* We re-use the newcookie timer for
                 * the INP kill timer. We must assure
                 * that we do not kill it by accident.
                 */
                break;
        case SCTP_TIMER_TYPE_INPKILL:
                /*
                 * The inp is setup to die. We re-use the
                 * signature_chage timer since that has
                 * stopped and we are in the GONE state.
                 */
                tmr = &inp->sctp_ep.signature_change;
                break;
        case SCTP_TIMER_TYPE_PATHMTURAISE:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                if (net == NULL) {
                        return (EFAULT);
                }
                tmr = &net->pmtu_timer;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNACK:
                if ((stcb == NULL) || (net == NULL)) {
                        return (EFAULT);
                }
                tmr = &net->rxt_timer;
                break;
        case SCTP_TIMER_TYPE_SHUTDOWNGUARD:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.shut_guard_timer;
                break;
        case SCTP_TIMER_TYPE_STRRESET:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.strreset_timer;
                break;
        case SCTP_TIMER_TYPE_ASCONF:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.asconf_timer;
                break;
        case SCTP_TIMER_TYPE_AUTOCLOSE:
                if (stcb == NULL) {
                        return (EFAULT);
                }
                tmr = &stcb->asoc.autoclose_timer;
                break;
        default:
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_TIMER1) {
                        kprintf("sctp_timer_stop:Unknown timer type %d\n",
                               t_type);
                }
#endif /* SCTP_DEBUG */
                break;
        };
        if (tmr == NULL)
                return (EFAULT);

        if ((tmr->type != t_type) && tmr->type) {
                /*
                 * Ok we have a timer that is under joint use. Cookie timer
                 * per chance with the SEND timer. We therefore are NOT
                 * running the timer that the caller wants stopped.  So just
                 * return.
                 */
                return (0);
        }
        if (t_type == SCTP_TIMER_TYPE_SEND) {
                stcb->asoc.num_send_timers_up--;
                if (stcb->asoc.num_send_timers_up < 0) {
                        stcb->asoc.num_send_timers_up = 0;
                }
        }
        callout_stop(&tmr->timer);
        return (0);
}

#ifdef SCTP_USE_ADLER32
static uint32_t
update_adler32(uint32_t adler, uint8_t *buf, int32_t len)
{
        u_int32_t s1 = adler & 0xffff;
        u_int32_t s2 = (adler >> 16) & 0xffff;
        int n;

        for (n = 0; n < len; n++, buf++) {
                /* s1 = (s1 + buf[n]) % BASE */
                /* first we add */
                s1 = (s1 + *buf);
                /*
                 * now if we need to, we do a mod by subtracting. It seems
                 * a bit faster since I really will only ever do one subtract
                 * at the MOST, since buf[n] is a max of 255.
                 */
                if (s1 >= SCTP_ADLER32_BASE) {
                        s1 -= SCTP_ADLER32_BASE;
                }
                /* s2 = (s2 + s1) % BASE */
                /* first we add */
                s2 = (s2 + s1);
                /*
                 * again, it is more efficent (it seems) to subtract since
                 * the most s2 will ever be is (BASE-1 + BASE-1) in the worse
                 * case. This would then be (2 * BASE) - 2, which will still
                 * only do one subtract. On Intel this is much better to do
                 * this way and avoid the divide. Have not -pg'd on sparc.
                 */
                if (s2 >= SCTP_ADLER32_BASE) {
                        s2 -= SCTP_ADLER32_BASE;
                }
        }
        /* Return the adler32 of the bytes buf[0..len-1] */
        return ((s2 << 16) + s1);
}

#endif


u_int32_t
sctp_calculate_len(struct mbuf *m)
{
        u_int32_t tlen=0;
        struct mbuf *at;
        at = m;
        while (at) {
                tlen += at->m_len;
                at = at->m_next;
        }
        return (tlen);
}

#if defined(SCTP_WITH_NO_CSUM)

uint32_t
sctp_calculate_sum(struct mbuf *m, int32_t *pktlen, uint32_t offset)
{
        /*
         * given a mbuf chain with a packetheader offset by 'offset'
         * pointing at a sctphdr (with csum set to 0) go through
         * the chain of m_next's and calculate the SCTP checksum.
         * This is currently Adler32 but will change to CRC32x
         * soon. Also has a side bonus calculate the total length
         * of the mbuf chain.
         * Note: if offset is greater than the total mbuf length,
         * checksum=1, pktlen=0 is returned (ie. no real error code)
         */
        if (pktlen == NULL)
                return (0);
        *pktlen = sctp_calculate_len(m);
        return (0);
}

#elif defined(SCTP_USE_INCHKSUM)

#include <machine/in_cksum.h>

uint32_t
sctp_calculate_sum(struct mbuf *m, int32_t *pktlen, uint32_t offset)
{
        /*
         * given a mbuf chain with a packetheader offset by 'offset'
         * pointing at a sctphdr (with csum set to 0) go through
         * the chain of m_next's and calculate the SCTP checksum.
         * This is currently Adler32 but will change to CRC32x
         * soon. Also has a side bonus calculate the total length
         * of the mbuf chain.
         * Note: if offset is greater than the total mbuf length,
         * checksum=1, pktlen=0 is returned (ie. no real error code)
         */
        int32_t tlen=0;
        struct mbuf *at;
        uint32_t the_sum, retsum;

        at = m;
        while (at) {
                tlen += at->m_len;
                at = at->m_next;
        }
        the_sum = (uint32_t)(in_cksum_skip(m, tlen, offset));
        if (pktlen != NULL)
                *pktlen = (tlen-offset);
        retsum = htons(the_sum);
        return (the_sum);
}

#else

uint32_t
sctp_calculate_sum(struct mbuf *m, int32_t *pktlen, uint32_t offset)
{
        /*
         * given a mbuf chain with a packetheader offset by 'offset'
         * pointing at a sctphdr (with csum set to 0) go through
         * the chain of m_next's and calculate the SCTP checksum.
         * This is currently Adler32 but will change to CRC32x
         * soon. Also has a side bonus calculate the total length
         * of the mbuf chain.
         * Note: if offset is greater than the total mbuf length,
         * checksum=1, pktlen=0 is returned (ie. no real error code)
         */
        int32_t tlen=0;
#ifdef SCTP_USE_ADLER32
        uint32_t base = 1L;
#else
        uint32_t base = 0xffffffff;
#endif /* SCTP_USE_ADLER32 */
        struct mbuf *at;
        at = m;
        /* find the correct mbuf and offset into mbuf */
        while ((at != NULL) && (offset > (uint32_t)at->m_len)) {
                offset -= at->m_len;    /* update remaining offset left */
                at = at->m_next;
        }

        while (at != NULL) {
#ifdef SCTP_USE_ADLER32
                base = update_adler32(base, at->m_data + offset,
                    at->m_len - offset);
#else
                base = update_crc32(base, at->m_data + offset,
                    at->m_len - offset);
#endif /* SCTP_USE_ADLER32 */
                tlen += at->m_len - offset;
                /* we only offset once into the first mbuf */
                if (offset) {
                        offset = 0;
                }
                at = at->m_next;
        }
        if (pktlen != NULL) {
                *pktlen = tlen;
        }
#ifdef SCTP_USE_ADLER32
        /* Adler32 */
        base = htonl(base);
#else
        /* CRC-32c */
        base = sctp_csum_finalize(base);
#endif
        return (base);
}


#endif

void
sctp_mtu_size_reset(struct sctp_inpcb *inp,
                    struct sctp_association *asoc, u_long mtu)
{
        /*
         * Reset the P-MTU size on this association, this involves changing
         * the asoc MTU, going through ANY chunk+overhead larger than mtu
         * to allow the DF flag to be cleared.
         */
        struct sctp_tmit_chunk *chk;
        struct sctp_stream_out *strm;
        unsigned int eff_mtu, ovh;
        asoc->smallest_mtu = mtu;
        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                ovh = SCTP_MIN_OVERHEAD;
        } else {
                ovh = SCTP_MIN_V4_OVERHEAD;
        }
        eff_mtu = mtu - ovh;
        /* Now mark any chunks that need to let IP fragment */
        TAILQ_FOREACH(strm, &asoc->out_wheel, next_spoke) {
                TAILQ_FOREACH(chk, &strm->outqueue, sctp_next) {
                        if (chk->send_size > eff_mtu) {
                                chk->flags &= SCTP_DONT_FRAGMENT;
                                chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
                        }
                }
        }
        TAILQ_FOREACH(chk, &asoc->send_queue, sctp_next) {
                if (chk->send_size > eff_mtu) {
                        chk->flags &= SCTP_DONT_FRAGMENT;
                        chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
                }
        }
        TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) {
                if (chk->send_size > eff_mtu) {
                        chk->flags &= SCTP_DONT_FRAGMENT;
                        chk->flags |= CHUNK_FLAGS_FRAGMENT_OK;
                }
        }
}


/*
 * given an association and starting time of the current RTT period
 * return RTO in number of usecs
 * net should point to the current network
 */
u_int32_t
sctp_calculate_rto(struct sctp_tcb *stcb,
                   struct sctp_association *asoc,
                   struct sctp_nets *net,
                   struct timeval *old)
{
        /*
         * given an association and the starting time of the current RTT
         * period (in value1/value2) return RTO in number of usecs.
         */
        int calc_time = 0;
        int o_calctime;
        unsigned int new_rto = 0;
        int first_measure = 0;
        struct timeval now;

        /************************/
        /* 1. calculate new RTT */
        /************************/
        /* get the current time */
        SCTP_GETTIME_TIMEVAL(&now);
        /* compute the RTT value */
        if ((u_long)now.tv_sec > (u_long)old->tv_sec) {
                calc_time = ((u_long)now.tv_sec - (u_long)old->tv_sec) * 1000;
                if ((u_long)now.tv_usec > (u_long)old->tv_usec) {
                        calc_time += (((u_long)now.tv_usec -
                                       (u_long)old->tv_usec)/1000);
                } else if ((u_long)now.tv_usec < (u_long)old->tv_usec) {
                        /* Borrow 1,000ms from current calculation */
                        calc_time -= 1000;
                        /* Add in the slop over */
                        calc_time += ((int)now.tv_usec/1000);
                        /* Add in the pre-second ms's */
                        calc_time += (((int)1000000 - (int)old->tv_usec)/1000);
                }
        } else if ((u_long)now.tv_sec == (u_long)old->tv_sec) {
                if ((u_long)now.tv_usec > (u_long)old->tv_usec) {
                        calc_time = ((u_long)now.tv_usec -
                                     (u_long)old->tv_usec)/1000;
                } else if ((u_long)now.tv_usec < (u_long)old->tv_usec) {
                        /* impossible .. garbage in nothing out */
                        return (((net->lastsa >> 2) + net->lastsv) >> 1);
                } else {
                        /* impossible .. garbage in nothing out */
                        return (((net->lastsa >> 2) + net->lastsv) >> 1);
                }
        } else {
                /* Clock wrapped? */
                return (((net->lastsa >> 2) + net->lastsv) >> 1);
        }
        /***************************/
        /* 2. update RTTVAR & SRTT */
        /***************************/
#if 0
        /*      if (net->lastsv || net->lastsa) {*/
        /* per Section 5.3.1 C3 in SCTP */
        /*              net->lastsv = (int)     *//* RTTVAR */
        /*                      (((double)(1.0 - 0.25) * (double)net->lastsv) +
                                (double)(0.25 * (double)abs(net->lastsa - calc_time)));
                                net->lastsa = (int) */  /* SRTT */
        /*(((double)(1.0 - 0.125) * (double)net->lastsa) +
          (double)(0.125 * (double)calc_time));
          } else {
        *//* the first RTT calculation, per C2 Section 5.3.1 */
        /*              net->lastsa = calc_time;        *//* SRTT */
        /*              net->lastsv = calc_time / 2;    *//* RTTVAR */
        /*      }*/
        /* if RTTVAR goes to 0 you set to clock grainularity */
        /*      if (net->lastsv == 0) {
                net->lastsv = SCTP_CLOCK_GRANULARITY;
                }
                new_rto = net->lastsa + 4 * net->lastsv;
        */
#endif
        o_calctime = calc_time;
        /* this is Van Jacobson's integer version */
        if (net->RTO) {
                calc_time -= (net->lastsa >> 3);
                net->lastsa += calc_time;
                if (calc_time < 0) {
                        calc_time = -calc_time;
                }
                calc_time -= (net->lastsv >> 2);
                net->lastsv += calc_time;
                if (net->lastsv == 0) {
                        net->lastsv = SCTP_CLOCK_GRANULARITY;
                }
        } else {
                /* First RTO measurment */
                net->lastsa = calc_time;
                net->lastsv = calc_time >> 1;
                first_measure = 1;
        }
        new_rto = ((net->lastsa >> 2) + net->lastsv) >> 1;
        if ((new_rto > SCTP_SAT_NETWORK_MIN) &&
            (stcb->asoc.sat_network_lockout == 0)) {
                stcb->asoc.sat_network = 1;
        } else  if ((!first_measure) && stcb->asoc.sat_network) {
                stcb->asoc.sat_network = 0;
                stcb->asoc.sat_network_lockout = 1;
        }
        /* bound it, per C6/C7 in Section 5.3.1 */
        if (new_rto < stcb->asoc.minrto) {
                new_rto = stcb->asoc.minrto;
        }
        if (new_rto > stcb->asoc.maxrto) {
                new_rto = stcb->asoc.maxrto;
        }
        /* we are now returning the RTT Smoothed */
        return ((u_int32_t)new_rto);
}


/*
 * return a pointer to a contiguous piece of data from the given
 * mbuf chain starting at 'off' for 'len' bytes.  If the desired
 * piece spans more than one mbuf, a copy is made at 'ptr'.
 * caller must ensure that the buffer size is >= 'len'
 * returns NULL if there there isn't 'len' bytes in the chain.
 */
caddr_t
sctp_m_getptr(struct mbuf *m, int off, int len, u_int8_t *in_ptr)
{
        uint32_t count;
        uint8_t *ptr;
        ptr = in_ptr;
        if ((off < 0) || (len <= 0))
                return (NULL);

        /* find the desired start location */
        while ((m != NULL) && (off > 0)) {
                if (off < m->m_len)
                        break;
                off -= m->m_len;
                m = m->m_next;
        }
        if (m == NULL)
                return (NULL);

        /* is the current mbuf large enough (eg. contiguous)? */
        if ((m->m_len - off) >= len) {
                return (mtod(m, caddr_t) + off);
        } else {
                /* else, it spans more than one mbuf, so save a temp copy... */
                while ((m != NULL) && (len > 0)) {
                        count = min(m->m_len - off, len);
                        bcopy(mtod(m, caddr_t) + off, ptr, count);
                        len -= count;
                        ptr += count;
                        off = 0;
                        m = m->m_next;
                }
                if ((m == NULL) && (len > 0))
                        return (NULL);
                else
                        return ((caddr_t)in_ptr);
        }
}


struct sctp_paramhdr *
sctp_get_next_param(struct mbuf *m,
                    int offset,
                    struct sctp_paramhdr *pull,
                    int pull_limit)
{
        /* This just provides a typed signature to Peter's Pull routine */
        return ((struct sctp_paramhdr *)sctp_m_getptr(m, offset, pull_limit,
            (u_int8_t *)pull));
}


int
sctp_add_pad_tombuf(struct mbuf *m, int padlen)
{
        /*
         * add padlen bytes of 0 filled padding to the end of the mbuf.
         * If padlen is > 3 this routine will fail.
         */
        u_int8_t *dp;
        int i;
        if (padlen > 3) {
                return (ENOBUFS);
        }
        if (M_TRAILINGSPACE(m)) {
                /*
                 * The easy way.
                 * We hope the majority of the time we hit here :)
                 */
                dp = (u_int8_t *)(mtod(m, caddr_t) + m->m_len);
                m->m_len += padlen;
        } else {
                /* Hard way we must grow the mbuf */
                struct mbuf *tmp;
                MGET(tmp, MB_DONTWAIT, MT_DATA);
                if (tmp == NULL) {
                        /* Out of space GAK! we are in big trouble. */
                        return (ENOSPC);
                }
                /* setup and insert in middle */
                tmp->m_next = m->m_next;
                tmp->m_len = padlen;
                m->m_next = tmp;
                dp = mtod(tmp, u_int8_t *);
        }
        /* zero out the pad */
        for (i=  0; i < padlen; i++) {
                *dp = 0;
                dp++;
        }
        return (0);
}

int
sctp_pad_lastmbuf(struct mbuf *m, int padval)
{
        /* find the last mbuf in chain and pad it */
        struct mbuf *m_at;
        m_at = m;
        while (m_at) {
                if (m_at->m_next == NULL) {
                        return (sctp_add_pad_tombuf(m_at, padval));
                }
                m_at = m_at->m_next;
        }
        return (EFAULT);
}

static void
sctp_notify_assoc_change(u_int32_t event, struct sctp_tcb *stcb,
    u_int32_t error)
{
        struct mbuf *m_notify;
        struct sctp_assoc_change *sac;
        struct sockaddr *to;
        struct sockaddr_in6 sin6, lsa6;

        /*
         * First if we are are going down dump everything we
         * can to the socket rcv queue.
         */
        if ((event == SCTP_SHUTDOWN_COMP) || (event == SCTP_COMM_LOST)) {
                sctp_deliver_data(stcb, &stcb->asoc, NULL, 0);
        }

        /*
         * For TCP model AND UDP connected sockets we will send
         * an error up when an ABORT comes in.
         */
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
             (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) &&
            (event == SCTP_COMM_LOST)) {
                stcb->sctp_socket->so_error = ECONNRESET;
                /* Wake ANY sleepers */
                sowwakeup(stcb->sctp_socket);
                sorwakeup(stcb->sctp_socket);
        }
#if 0
        if ((event == SCTP_COMM_UP) &&
            (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) &&
            (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED)) {
                 soisconnected(stcb->sctp_socket);
        }
#endif
        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_RECVASSOCEVNT)) {
                /* event not enabled */
                return;
        }
        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;

        sac = mtod(m_notify, struct sctp_assoc_change *);
        sac->sac_type = SCTP_ASSOC_CHANGE;
        sac->sac_flags = 0;
        sac->sac_length = sizeof(struct sctp_assoc_change);
        sac->sac_state = event;
        sac->sac_error = error;
        /* XXX verify these stream counts */
        sac->sac_outbound_streams = stcb->asoc.streamoutcnt;
        sac->sac_inbound_streams = stcb->asoc.streamincnt;
        sac->sac_assoc_id = sctp_get_associd(stcb);

        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = sizeof(struct sctp_assoc_change);
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_assoc_change);
        m_notify->m_next = NULL;

        /* append to socket */
        to = (struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            to->sa_family == AF_INET) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
                                                   &lsa6);
        /*
         * We need to always notify comm changes.
         * if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
         *      sctp_m_freem(m_notify);
         *      return;
         * }
        */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv,
            to, m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        /* Wake up any sleeper */
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
        sctp_sowwakeup(stcb->sctp_ep, stcb->sctp_socket);
}

static void
sctp_notify_peer_addr_change(struct sctp_tcb *stcb, uint32_t state,
    struct sockaddr *sa, uint32_t error)
{
        struct mbuf *m_notify;
        struct sctp_paddr_change *spc;
        struct sockaddr *to;
        struct sockaddr_in6 sin6, lsa6;

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_RECVPADDREVNT))
                /* event not enabled */
                return;

        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                return;
        m_notify->m_len = 0;

        MCLGET(m_notify, MB_DONTWAIT);
        if ((m_notify->m_flags & M_EXT) != M_EXT) {
                sctp_m_freem(m_notify);
                return;
        }

        spc = mtod(m_notify, struct sctp_paddr_change *);
        spc->spc_type = SCTP_PEER_ADDR_CHANGE;
        spc->spc_flags = 0;
        spc->spc_length = sizeof(struct sctp_paddr_change);
        if (sa->sa_family == AF_INET) {
                memcpy(&spc->spc_aaddr, sa, sizeof(struct sockaddr_in));
        } else {
                memcpy(&spc->spc_aaddr, sa, sizeof(struct sockaddr_in6));
        }
        spc->spc_state = state;
        spc->spc_error = error;
        spc->spc_assoc_id = sctp_get_associd(stcb);

        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = sizeof(struct sctp_paddr_change);
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_paddr_change);
        m_notify->m_next = NULL;

        to = (struct sockaddr *)(struct sockaddr *)
            &stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            to->sa_family == AF_INET) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
            &lsa6);

        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                sctp_m_freem(m_notify);
                return;
        }
        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}


static void
sctp_notify_send_failed(struct sctp_tcb *stcb, u_int32_t error,
                        struct sctp_tmit_chunk *chk)
{
        struct mbuf *m_notify;
        struct sctp_send_failed *ssf;
        struct sockaddr_in6 sin6, lsa6;
        struct sockaddr *to;
        int length;

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_RECVSENDFAILEVNT))
                /* event not enabled */
                return;

        length = sizeof(struct sctp_send_failed) + chk->send_size;
        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;
        ssf = mtod(m_notify, struct sctp_send_failed *);
        ssf->ssf_type = SCTP_SEND_FAILED;
        if (error == SCTP_NOTIFY_DATAGRAM_UNSENT)
                ssf->ssf_flags = SCTP_DATA_UNSENT;
        else
                ssf->ssf_flags = SCTP_DATA_SENT;
        ssf->ssf_length = length;
        ssf->ssf_error = error;
        /* not exactly what the user sent in, but should be close :) */
        ssf->ssf_info.sinfo_stream = chk->rec.data.stream_number;
        ssf->ssf_info.sinfo_ssn = chk->rec.data.stream_seq;
        ssf->ssf_info.sinfo_flags = chk->rec.data.rcv_flags;
        ssf->ssf_info.sinfo_ppid = chk->rec.data.payloadtype;
        ssf->ssf_info.sinfo_context = chk->rec.data.context;
        ssf->ssf_info.sinfo_assoc_id = sctp_get_associd(stcb);
        ssf->ssf_assoc_id = sctp_get_associd(stcb);
        m_notify->m_next = chk->data;
        if (m_notify->m_next == NULL)
                m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        else {
                struct mbuf *m;
                m_notify->m_flags |= M_NOTIFICATION;
                m = m_notify;
                while (m->m_next != NULL)
                        m = m->m_next;
                m->m_flags |= M_EOR;
        }
        m_notify->m_pkthdr.len = length;
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_send_failed);

        /* Steal off the mbuf */
        chk->data = NULL;
        to = (struct sockaddr *)(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            to->sa_family == AF_INET) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
                                                   &lsa6);

        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                sctp_m_freem(m_notify);
                return;
        }

        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}

static void
sctp_notify_adaption_layer(struct sctp_tcb *stcb,
                           u_int32_t error)
{
        struct mbuf *m_notify;
        struct sctp_adaption_event *sai;
        struct sockaddr_in6 sin6, lsa6;
        struct sockaddr *to;

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_ADAPTIONEVNT))
                /* event not enabled */
                return;

        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;
        sai = mtod(m_notify, struct sctp_adaption_event *);
        sai->sai_type = SCTP_ADAPTION_INDICATION;
        sai->sai_flags = 0;
        sai->sai_length = sizeof(struct sctp_adaption_event);
        sai->sai_adaption_ind = error;
        sai->sai_assoc_id = sctp_get_associd(stcb);

        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = sizeof(struct sctp_adaption_event);
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_adaption_event);
        m_notify->m_next = NULL;

        to = (struct sockaddr *)(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            (to->sa_family == AF_INET)) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
                                                   &lsa6);
        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                sctp_m_freem(m_notify);
                return;
        }
        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}

static void
sctp_notify_partial_delivery_indication(struct sctp_tcb *stcb,
                                        u_int32_t error)
{
        struct mbuf *m_notify;
        struct sctp_pdapi_event *pdapi;
        struct sockaddr_in6 sin6, lsa6;
        struct sockaddr *to;

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_PDAPIEVNT))
                /* event not enabled */
                return;

        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;
        pdapi = mtod(m_notify, struct sctp_pdapi_event *);
        pdapi->pdapi_type = SCTP_PARTIAL_DELIVERY_EVENT;
        pdapi->pdapi_flags = 0;
        pdapi->pdapi_length = sizeof(struct sctp_pdapi_event);
        pdapi->pdapi_indication = error;
        pdapi->pdapi_assoc_id = sctp_get_associd(stcb);

        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = sizeof(struct sctp_pdapi_event);
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_pdapi_event);
        m_notify->m_next = NULL;

        to = (struct sockaddr *)(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            (to->sa_family == AF_INET)) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
                                                   &lsa6);
        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                sctp_m_freem(m_notify);
                return;
        }
        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}

static void
sctp_notify_shutdown_event(struct sctp_tcb *stcb)
{
        struct mbuf *m_notify;
        struct sctp_shutdown_event *sse;
        struct sockaddr_in6 sin6, lsa6;
        struct sockaddr *to;

        /*
         * For TCP model AND UDP connected sockets we will send
         * an error up when an SHUTDOWN completes
         */
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
            (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
                /* mark socket closed for read/write and wakeup! */
                socantrcvmore(stcb->sctp_socket);
                socantsendmore(stcb->sctp_socket);
        }

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_RECVSHUTDOWNEVNT))
                /* event not enabled */
                return;

        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;
        sse = mtod(m_notify, struct sctp_shutdown_event *);
        sse->sse_type = SCTP_SHUTDOWN_EVENT;
        sse->sse_flags = 0;
        sse->sse_length = sizeof(struct sctp_shutdown_event);
        sse->sse_assoc_id = sctp_get_associd(stcb);

        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = sizeof(struct sctp_shutdown_event);
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = sizeof(struct sctp_shutdown_event);
        m_notify->m_next = NULL;

        to = (struct sockaddr *)(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            to->sa_family == AF_INET) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
            &lsa6);
        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                sctp_m_freem(m_notify);
                return;
        }
        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}

static void
sctp_notify_stream_reset(struct sctp_tcb *stcb,
    int number_entries, uint16_t *list, int flag)
{
        struct mbuf *m_notify;
        struct sctp_stream_reset_event *strreset;
        struct sockaddr_in6 sin6, lsa6;
        struct sockaddr *to;
        int len;

        if (!(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_STREAM_RESETEVNT))
                /* event not enabled */
                return;

        MGETHDR(m_notify, MB_DONTWAIT, MT_DATA);
        if (m_notify == NULL)
                /* no space left */
                return;
        m_notify->m_len = 0;
        len = sizeof(struct sctp_stream_reset_event) + (number_entries * sizeof(uint16_t));
        if (len > M_TRAILINGSPACE(m_notify)) {
                MCLGET(m_notify, MB_WAIT);
        }
        if (m_notify == NULL)
                /* no clusters */
                return;

        if (len > M_TRAILINGSPACE(m_notify)) {
                /* never enough room */
                m_freem(m_notify);
                return;
        }
        strreset = mtod(m_notify, struct sctp_stream_reset_event *);
        strreset->strreset_type = SCTP_STREAM_RESET_EVENT;
        if (number_entries == 0) {
                strreset->strreset_flags = flag | SCTP_STRRESET_ALL_STREAMS;
        } else {
                strreset->strreset_flags = flag | SCTP_STRRESET_STREAM_LIST;
        }
        strreset->strreset_length = len;
        strreset->strreset_assoc_id = sctp_get_associd(stcb);
        if (number_entries) {
                int i;
                for (i=0; i<number_entries; i++) {
                        strreset->strreset_list[i] = list[i];
                }
        }
        m_notify->m_flags |= M_EOR | M_NOTIFICATION;
        m_notify->m_pkthdr.len = len;
        m_notify->m_pkthdr.rcvif = 0;
        m_notify->m_len = len;
        m_notify->m_next = NULL;
        if (sctp_sbspace(&stcb->sctp_socket->so_rcv) < m_notify->m_len) {
                /* no space */
                sctp_m_freem(m_notify);
                return;
        }
        to = (struct sockaddr *)(struct sockaddr *)&stcb->asoc.primary_destination->ro._l_addr;
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_NEEDS_MAPPED_V4) &&
            to->sa_family == AF_INET) {
                struct sockaddr_in *sin;

                sin = (struct sockaddr_in *)to;
                bzero(&sin6, sizeof(sin6));
                sin6.sin6_family = AF_INET6;
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_addr.s6_addr16[2] = 0xffff;
                bcopy(&sin->sin_addr, &sin6.sin6_addr.s6_addr16[3],
                    sizeof(sin6.sin6_addr.s6_addr16[3]));
                sin6.sin6_port = sin->sin_port;
                to = (struct sockaddr *)&sin6;
        }
        /* check and strip embedded scope junk */
        to = (struct sockaddr *)sctp_recover_scope((struct sockaddr_in6 *)to,
            &lsa6);
        /* append to socket */
        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_WLOCK(stcb->sctp_ep);
        SCTP_TCB_LOCK(stcb);
        if (!sctp_sbappendaddr_nocheck(&stcb->sctp_socket->so_rcv, to,
            m_notify, NULL, stcb->asoc.my_vtag, stcb->sctp_ep)) {
                /* not enough room */
                sctp_m_freem(m_notify);
                SCTP_INP_WUNLOCK(stcb->sctp_ep);
                return;
        }
        if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) &&
           ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0)){
                if (sctp_add_to_socket_q(stcb->sctp_ep, stcb)) {
                        stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
                }
        } else {
                stcb->asoc.my_rwnd_control_len += sizeof(struct mbuf);
        }
        SCTP_INP_WUNLOCK(stcb->sctp_ep);
        sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket);
}


void
sctp_ulp_notify(u_int32_t notification, struct sctp_tcb *stcb,
                u_int32_t error, void *data)
{
        if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                /* No notifications up when we are in a no socket state */
                return;
        }
        if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) {
                /* Can't send up to a closed socket any notifications */
                return;
        }
        switch (notification) {
        case SCTP_NOTIFY_ASSOC_UP:
                sctp_notify_assoc_change(SCTP_COMM_UP, stcb, error);
                break;
        case SCTP_NOTIFY_ASSOC_DOWN:
                sctp_notify_assoc_change(SCTP_SHUTDOWN_COMP, stcb, error);
                break;
        case SCTP_NOTIFY_INTERFACE_DOWN:
        {
                struct sctp_nets *net;
                net = (struct sctp_nets *)data;
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_UNREACHABLE,
                    (struct sockaddr *)&net->ro._l_addr, error);
                break;
        }
        case SCTP_NOTIFY_INTERFACE_UP:
        {
                struct sctp_nets *net;
                net = (struct sctp_nets *)data;
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_AVAILABLE,
                    (struct sockaddr *)&net->ro._l_addr, error);
                break;
        }
        case SCTP_NOTIFY_INTERFACE_CONFIRMED:
        {
                struct sctp_nets *net;
                net = (struct sctp_nets *)data;
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_CONFIRMED,
                    (struct sockaddr *)&net->ro._l_addr, error);
                break;
        }
        case SCTP_NOTIFY_DG_FAIL:
                sctp_notify_send_failed(stcb, error,
                    (struct sctp_tmit_chunk *)data);
                break;
        case SCTP_NOTIFY_ADAPTION_INDICATION:
                /* Here the error is the adaption indication */
                sctp_notify_adaption_layer(stcb, error);
                break;
        case SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION:
                sctp_notify_partial_delivery_indication(stcb, error);
                break;
        case SCTP_NOTIFY_STRDATA_ERR:
                break;
        case SCTP_NOTIFY_ASSOC_ABORTED:
                sctp_notify_assoc_change(SCTP_COMM_LOST, stcb, error);
                break;
        case SCTP_NOTIFY_PEER_OPENED_STREAM:
                break;
        case SCTP_NOTIFY_STREAM_OPENED_OK:
                break;
        case SCTP_NOTIFY_ASSOC_RESTART:
                sctp_notify_assoc_change(SCTP_RESTART, stcb, error);
                break;
        case SCTP_NOTIFY_HB_RESP:
                break;
        case SCTP_NOTIFY_STR_RESET_SEND:
                sctp_notify_stream_reset(stcb, error, ((uint16_t *)data), SCTP_STRRESET_OUTBOUND_STR);
                break;
        case SCTP_NOTIFY_STR_RESET_RECV:
                sctp_notify_stream_reset(stcb, error, ((uint16_t *)data), SCTP_STRRESET_INBOUND_STR);
                break;
        case SCTP_NOTIFY_ASCONF_ADD_IP:
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_ADDED, data,
                    error);
                break;
        case SCTP_NOTIFY_ASCONF_DELETE_IP:
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_REMOVED, data,
                    error);
                break;
        case SCTP_NOTIFY_ASCONF_SET_PRIMARY:
                sctp_notify_peer_addr_change(stcb, SCTP_ADDR_MADE_PRIM, data,
                    error);
                break;
        case SCTP_NOTIFY_ASCONF_SUCCESS:
                break;
        case SCTP_NOTIFY_ASCONF_FAILED:
                break;
        case SCTP_NOTIFY_PEER_SHUTDOWN:
                sctp_notify_shutdown_event(stcb);
                break;
        default:
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_UTIL1) {
                        kprintf("NOTIFY: unknown notification %xh (%u)\n",
                            notification, notification);
                }
#endif /* SCTP_DEBUG */
                break;
        } /* end switch */
}

void
sctp_report_all_outbound(struct sctp_tcb *stcb)
{
        struct sctp_association *asoc;
        struct sctp_stream_out *outs;
        struct sctp_tmit_chunk *chk;

        asoc = &stcb->asoc;

        if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                return;
        }
        /* now through all the gunk freeing chunks */
        TAILQ_FOREACH(outs, &asoc->out_wheel, next_spoke) {
                /* now clean up any chunks here */
                chk = TAILQ_FIRST(&outs->outqueue);
                while (chk) {
                        stcb->asoc.stream_queue_cnt--;
                        TAILQ_REMOVE(&outs->outqueue, chk, sctp_next);
                        sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
                            SCTP_NOTIFY_DATAGRAM_UNSENT, chk);
                        if (chk->data) {
                                sctp_m_freem(chk->data);
                                chk->data = NULL;
                        }
                        if (chk->whoTo)
                                sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = NULL;
                        chk->asoc = NULL;
                        /* Free the chunk */
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                        sctppcbinfo.ipi_count_chunk--;
                        if ((int)sctppcbinfo.ipi_count_chunk < 0) {
                                panic("Chunk count is negative");
                        }
                        sctppcbinfo.ipi_gencnt_chunk++;
                        chk = TAILQ_FIRST(&outs->outqueue);
                }
        }
        /* pending send queue SHOULD be empty */
        if (!TAILQ_EMPTY(&asoc->send_queue)) {
                chk = TAILQ_FIRST(&asoc->send_queue);
                while (chk) {
                        TAILQ_REMOVE(&asoc->send_queue, chk, sctp_next);
                        sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, SCTP_NOTIFY_DATAGRAM_UNSENT, chk);
                        if (chk->data) {
                                sctp_m_freem(chk->data);
                                chk->data = NULL;
                        }
                        if (chk->whoTo)
                                sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = NULL;
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                        sctppcbinfo.ipi_count_chunk--;
                        if ((int)sctppcbinfo.ipi_count_chunk < 0) {
                                panic("Chunk count is negative");
                        }
                        sctppcbinfo.ipi_gencnt_chunk++;
                        chk = TAILQ_FIRST(&asoc->send_queue);
                }
        }
        /* sent queue SHOULD be empty */
        if (!TAILQ_EMPTY(&asoc->sent_queue)) {
                chk = TAILQ_FIRST(&asoc->sent_queue);
                while (chk) {
                        TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next);
                        sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb,
                            SCTP_NOTIFY_DATAGRAM_SENT, chk);
                        if (chk->data) {
                                sctp_m_freem(chk->data);
                                chk->data = NULL;
                        }
                        if (chk->whoTo)
                                sctp_free_remote_addr(chk->whoTo);
                        chk->whoTo = NULL;
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                        sctppcbinfo.ipi_count_chunk--;
                        if ((int)sctppcbinfo.ipi_count_chunk < 0) {
                                panic("Chunk count is negative");
                        }
                        sctppcbinfo.ipi_gencnt_chunk++;
                        chk = TAILQ_FIRST(&asoc->sent_queue);
                }
        }
}

void
sctp_abort_notification(struct sctp_tcb *stcb, int error)
{

        if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                return;
        }
        /* Tell them we lost the asoc */
        sctp_report_all_outbound(stcb);
        sctp_ulp_notify(SCTP_NOTIFY_ASSOC_ABORTED, stcb, error, NULL);
}

void
sctp_abort_association(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    struct mbuf *m, int iphlen, struct sctphdr *sh, struct mbuf *op_err)
{
        u_int32_t vtag;

        vtag = 0;
        if (stcb != NULL) {
                /* We have a TCB to abort, send notification too */
                vtag = stcb->asoc.peer_vtag;
                sctp_abort_notification(stcb, 0);
        }
        sctp_send_abort(m, iphlen, sh, vtag, op_err);
        if (stcb != NULL) {
                /* Ok, now lets free it */
                sctp_free_assoc(inp, stcb);
        } else {
                if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                        if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
                                sctp_inpcb_free(inp, 1);
                        }
                }
        }
}

void
sctp_abort_an_association(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    int error, struct mbuf *op_err)
{
        u_int32_t vtag;

        if (stcb == NULL) {
                /* Got to have a TCB */
                if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                        if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
                                sctp_inpcb_free(inp, 1);
                        }
                }
                return;
        }
        vtag = stcb->asoc.peer_vtag;
        /* notify the ulp */
        if ((inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) == 0)
                sctp_abort_notification(stcb, error);
        /* notify the peer */
        sctp_send_abort_tcb(stcb, op_err);
        /* now free the asoc */
        sctp_free_assoc(inp, stcb);
}

void
sctp_handle_ootb(struct mbuf *m, int iphlen, int offset, struct sctphdr *sh,
    struct sctp_inpcb *inp, struct mbuf *op_err)
{
        struct sctp_chunkhdr *ch, chunk_buf;
        unsigned int chk_length;

        /* Generate a TO address for future reference */
        if (inp && (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE)) {
                if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
                        sctp_inpcb_free(inp, 1);
                }
        }
        ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
            sizeof(*ch), (u_int8_t *)&chunk_buf);
        while (ch != NULL) {
                chk_length = ntohs(ch->chunk_length);
                if (chk_length < sizeof(*ch)) {
                        /* break to abort land */
                        break;
                }
                switch (ch->chunk_type) {
                case SCTP_PACKET_DROPPED:
                        /* we don't respond to pkt-dropped */
                        return;
                case SCTP_ABORT_ASSOCIATION:
                        /* we don't respond with an ABORT to an ABORT */
                        return;
                case SCTP_SHUTDOWN_COMPLETE:
                        /*
                         * we ignore it since we are not waiting for it
                         * and peer is gone
                         */
                        return;
                case SCTP_SHUTDOWN_ACK:
                        sctp_send_shutdown_complete2(m, iphlen, sh);
                        return;
                default:
                        break;
                }
                offset += SCTP_SIZE32(chk_length);
                ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
                    sizeof(*ch), (u_int8_t *)&chunk_buf);
        }
        sctp_send_abort(m, iphlen, sh, 0, op_err);
}

/*
 * check the inbound datagram to make sure there is not an abort
 * inside it, if there is return 1, else return 0.
 */
int
sctp_is_there_an_abort_here(struct mbuf *m, int iphlen, int *vtagfill)
{
        struct sctp_chunkhdr *ch;
        struct sctp_init_chunk *init_chk, chunk_buf;
        int offset;
        unsigned int chk_length;

        offset = iphlen + sizeof(struct sctphdr);
        ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset, sizeof(*ch),
            (u_int8_t *)&chunk_buf);
        while (ch != NULL) {
                chk_length = ntohs(ch->chunk_length);
                if (chk_length < sizeof(*ch)) {
                        /* packet is probably corrupt */
                        break;
                }
                /* we seem to be ok, is it an abort? */
                if (ch->chunk_type == SCTP_ABORT_ASSOCIATION) {
                        /* yep, tell them */
                        return (1);
                }
                if (ch->chunk_type == SCTP_INITIATION) {
                        /* need to update the Vtag */
                        init_chk = (struct sctp_init_chunk *)sctp_m_getptr(m,
                            offset, sizeof(*init_chk), (u_int8_t *)&chunk_buf);
                        if (init_chk != NULL) {
                                *vtagfill = ntohl(init_chk->init.initiate_tag);
                        }
                }
                /* Nope, move to the next chunk */
                offset += SCTP_SIZE32(chk_length);
                ch = (struct sctp_chunkhdr *)sctp_m_getptr(m, offset,
                    sizeof(*ch), (u_int8_t *)&chunk_buf);
        }
        return (0);
}

/*
 * currently (2/02), ifa_addr embeds scope_id's and don't
 * have sin6_scope_id set (i.e. it's 0)
 * so, create this function to compare link local scopes
 */
uint32_t
sctp_is_same_scope(struct sockaddr_in6 *addr1, struct sockaddr_in6 *addr2)
{
        struct sockaddr_in6 a, b;

        /* save copies */
        a = *addr1;
        b = *addr2;

        if (a.sin6_scope_id == 0)
                if (in6_recoverscope(&a, &a.sin6_addr, NULL)) {
                        /* can't get scope, so can't match */
                        return (0);
                }
        if (b.sin6_scope_id == 0)
                if (in6_recoverscope(&b, &b.sin6_addr, NULL)) {
                        /* can't get scope, so can't match */
                        return (0);
                }
        if (a.sin6_scope_id != b.sin6_scope_id)
                return (0);

        return (1);
}

/*
 * returns a sockaddr_in6 with embedded scope recovered and removed
 */
struct sockaddr_in6 *
sctp_recover_scope(struct sockaddr_in6 *addr, struct sockaddr_in6 *store)
{

        /* check and strip embedded scope junk */
        if (addr->sin6_family == AF_INET6) {
                if (IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr)) {
                        if (addr->sin6_scope_id == 0) {
                                *store = *addr;
                                if (!in6_recoverscope(store, &store->sin6_addr,
                                    NULL)) {
                                        /* use the recovered scope */
                                        addr = store;
                                }
                                /* else, return the original "to" addr */
                        }
                }
        }
        return (addr);
}

/*
 * are the two addresses the same?  currently a "scopeless" check
 * returns: 1 if same, 0 if not
 */
int
sctp_cmpaddr(struct sockaddr *sa1, struct sockaddr *sa2)
{

        /* must be valid */
        if (sa1 == NULL || sa2 == NULL)
                return (0);

        /* must be the same family */
        if (sa1->sa_family != sa2->sa_family)
                return (0);

        if (sa1->sa_family == AF_INET6) {
                /* IPv6 addresses */
                struct sockaddr_in6 *sin6_1, *sin6_2;

                sin6_1 = (struct sockaddr_in6 *)sa1;
                sin6_2 = (struct sockaddr_in6 *)sa2;
                return (SCTP6_ARE_ADDR_EQUAL(&sin6_1->sin6_addr,
                    &sin6_2->sin6_addr));
        } else if (sa1->sa_family == AF_INET) {
                /* IPv4 addresses */
                struct sockaddr_in *sin_1, *sin_2;

                sin_1 = (struct sockaddr_in *)sa1;
                sin_2 = (struct sockaddr_in *)sa2;
                return (sin_1->sin_addr.s_addr == sin_2->sin_addr.s_addr);
        } else {
                /* we don't do these... */
                return (0);
        }
}

void
sctp_print_address(struct sockaddr *sa)
{

        if (sa->sa_family == AF_INET6) {
                struct sockaddr_in6 *sin6;
                sin6 = (struct sockaddr_in6 *)sa;
                kprintf("IPv6 address: %s:%d scope:%u\n",
                    ip6_sprintf(&sin6->sin6_addr), ntohs(sin6->sin6_port),
                    sin6->sin6_scope_id);
        } else if (sa->sa_family == AF_INET) {
                struct sockaddr_in *sin;
                sin = (struct sockaddr_in *)sa;
                kprintf("IPv4 address: %s:%d\n", inet_ntoa(sin->sin_addr),
                    ntohs(sin->sin_port));
        } else {
                kprintf("?\n");
        }
}

void
sctp_print_address_pkt(struct ip *iph, struct sctphdr *sh)
{
        if (iph->ip_v == IPVERSION) {
                struct sockaddr_in lsa, fsa;

                bzero(&lsa, sizeof(lsa));
                lsa.sin_len = sizeof(lsa);
                lsa.sin_family = AF_INET;
                lsa.sin_addr = iph->ip_src;
                lsa.sin_port = sh->src_port;
                bzero(&fsa, sizeof(fsa));
                fsa.sin_len = sizeof(fsa);
                fsa.sin_family = AF_INET;
                fsa.sin_addr = iph->ip_dst;
                fsa.sin_port = sh->dest_port;
                kprintf("src: ");
                sctp_print_address((struct sockaddr *)&lsa);
                kprintf("dest: ");
                sctp_print_address((struct sockaddr *)&fsa);
        } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                struct ip6_hdr *ip6;
                struct sockaddr_in6 lsa6, fsa6;

                ip6 = (struct ip6_hdr *)iph;
                bzero(&lsa6, sizeof(lsa6));
                lsa6.sin6_len = sizeof(lsa6);
                lsa6.sin6_family = AF_INET6;
                lsa6.sin6_addr = ip6->ip6_src;
                lsa6.sin6_port = sh->src_port;
                bzero(&fsa6, sizeof(fsa6));
                fsa6.sin6_len = sizeof(fsa6);
                fsa6.sin6_family = AF_INET6;
                fsa6.sin6_addr = ip6->ip6_dst;
                fsa6.sin6_port = sh->dest_port;
                kprintf("src: ");
                sctp_print_address((struct sockaddr *)&lsa6);
                kprintf("dest: ");
                sctp_print_address((struct sockaddr *)&fsa6);
        }
}

#if defined(__FreeBSD__) || defined(__APPLE__)

/* cloned from uipc_socket.c */

#define SCTP_SBLINKRECORD(sb, m0) do {                                  \
        if ((sb)->sb_lastrecord != NULL)                                \
                (sb)->sb_lastrecord->m_nextpkt = (m0);                  \
        else                                                            \
                (sb)->sb_mb = (m0);                                     \
        (sb)->sb_lastrecord = (m0);                                     \
} while (/*CONSTCOND*/0)
#endif


int
sctp_sbappendaddr_nocheck(struct signalsockbuf *ssb, struct sockaddr *asa, struct mbuf *m0,
                     struct mbuf *control, u_int32_t tag,
                     struct sctp_inpcb *inp)
{
        struct mbuf *m, *n, *nlast;
        int cnt=0;

        if (m0 && (m0->m_flags & M_PKTHDR) == 0)
                panic("sctp_sbappendaddr_nocheck");

        for (n = control; n; n = n->m_next) {
                if (n->m_next == 0)     /* get pointer to last control buf */
                        break;
        }
        if (((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) == 0) ||
            ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)== 0)) {
                if (asa->sa_len > MHLEN)
                        return (0);
 try_again:
                MGETHDR(m, MB_DONTWAIT, MT_SONAME);
                if (m == 0)
                        return (0);
                m->m_len = 0;
                /* safety */
                if (m == m0) {
                        kprintf("Duplicate mbuf allocated %p in and mget returned %p?\n",
                               m0, m);
                        if (cnt) {
                                panic("more than once");
                        }
                        cnt++;
                        goto try_again;
                }
                m->m_len = asa->sa_len;
                bcopy((caddr_t)asa, mtod(m, caddr_t), asa->sa_len);
        }
        else {
                m = NULL;
        }
        if (n)
                n->m_next = m0;         /* concatenate data to control */
        else
                control = m0;
        if (m)
                m->m_next = control;
        else
                m = control;
        m->m_pkthdr.csum_data = (int)tag;

        SOCKBUF_LOCK(ssb);
        for (n = m; n; n = n->m_next)
                sballoc(&ssb->sb, n);
        nlast = n;
        if (ssb->ssb_mb == NULL) {
                inp->sctp_vtag_first = tag;
        }
        if ((n = ssb->ssb_mb) != NULL) {
                if ((n->m_nextpkt != inp->sb_last_mpkt) && (n->m_nextpkt == NULL)) {
                        inp->sb_last_mpkt = NULL;
                }
                if (inp->sb_last_mpkt)
                        inp->sb_last_mpkt->m_nextpkt = m;
                else {
                        while (n->m_nextpkt) {
                                n = n->m_nextpkt;
                        }
                        n->m_nextpkt = m;
                }
                inp->sb_last_mpkt = m;
        } else {
                inp->sb_last_mpkt = ssb->ssb_mb = m;
                inp->sctp_vtag_first = tag;
        }
        SOCKBUF_UNLOCK(ssb);
        return (1);
}

/*************HOLD THIS COMMENT FOR PATCH FILE OF
 *************ALTERNATE ROUTING CODE
 */

/*************HOLD THIS COMMENT FOR END OF PATCH FILE OF
 *************ALTERNATE ROUTING CODE
 */

struct mbuf *
sctp_generate_invmanparam(int err)
{
        /* Return a MBUF with a invalid mandatory parameter */
        struct mbuf *m;

        MGET(m, MB_DONTWAIT, MT_DATA);
        if (m) {
                struct sctp_paramhdr *ph;
                m->m_len = sizeof(struct sctp_paramhdr);
                ph = mtod(m, struct sctp_paramhdr *);
                ph->param_length = htons(sizeof(struct sctp_paramhdr));
                ph->param_type = htons(err);
        }
        return (m);
}

static int
sctp_should_be_moved(struct mbuf *this, struct sctp_association *asoc)
{
        struct mbuf *m;
        /*
         * given a mbuf chain, look through it finding
         * the M_PKTHDR and return 1 if it belongs to
         * the association given. We tell this by
         * a kludge where we stuff the my_vtag of the asoc
         * into the m->m_pkthdr.csum_data/csum field.
         */
        m = this;
        while (m) {
                if (m->m_flags & M_PKTHDR) {
                        /* check it */
#if defined(__OpenBSD__)
                        if ((u_int32_t)m->m_pkthdr.csum == asoc->my_vtag)
#else
                        if ((u_int32_t)m->m_pkthdr.csum_data == asoc->my_vtag)
#endif
                        {
                                /* Yep */
                                return (1);
                        }
                }
                m = m->m_next;
        }
        return (0);
}

u_int32_t
sctp_get_first_vtag_from_sb(struct socket *so)
{
        struct mbuf *this, *at;
        u_int32_t retval;

        retval = 0;
        if (so->so_rcv.ssb_mb) {
                /* grubbing time */
                this = so->so_rcv.ssb_mb;
                while (this) {
                        at = this;
                        /* get to the m_pkthdr */
                        while (at) {
                                if (at->m_flags & M_PKTHDR)
                                        break;
                                else {
                                        at = at->m_next;
                                }
                        }
                        /* now do we have a m_pkthdr */
                        if (at && (at->m_flags & M_PKTHDR)) {
                                /* check it */
#if defined(__OpenBSD__)
                                if ((u_int32_t)at->m_pkthdr.csum != 0)
#else
                                if ((u_int32_t)at->m_pkthdr.csum_data != 0)
#endif
                                {
                                        /* its the one */
#if defined(__OpenBSD__)
                                        retval = (u_int32_t)at->m_pkthdr.csum;
#else
                                        retval =
                                            (u_int32_t)at->m_pkthdr.csum_data;
#endif
                                        break;
                                }
                        }
                        this = this->m_nextpkt;
                }

        }
        return (retval);

}
void
sctp_grub_through_socket_buffer(struct sctp_inpcb *inp, struct socket *old,
    struct socket *new, struct sctp_tcb *stcb)
{
        struct mbuf **put, **take, *next, *this;
        struct signalsockbuf *old_sb, *new_sb;
        struct sctp_association *asoc;
        int moved_top = 0;

        asoc = &stcb->asoc;
        old_sb = &old->so_rcv;
        new_sb = &new->so_rcv;
        if (old_sb->ssb_mb == NULL) {
                /* Nothing to move */
                return;
        }
        SOCKBUF_LOCK(old_sb);
        SOCKBUF_LOCK(new_sb);

        if (inp->sctp_vtag_first == asoc->my_vtag) {
                /* First one must be moved */
                struct mbuf *mm;
                for (mm = old_sb->ssb_mb; mm; mm = mm->m_next) {
                        /*
                         * Go down the chain and fix
                         * the space allocation of the
                         * two sockets.
                         */
                        sbfree(&old_sb->sb, mm);
                        sballoc(&new_sb->sb, mm);
                }
                new_sb->ssb_mb = old_sb->ssb_mb;
                old_sb->ssb_mb = new_sb->ssb_mb->m_nextpkt;
                new_sb->ssb_mb->m_nextpkt = NULL;
                put = &new_sb->ssb_mb->m_nextpkt;
                moved_top = 1;
        } else {
                put = &new_sb->ssb_mb;
        }

        take = &old_sb->ssb_mb;
        next = old_sb->ssb_mb;
        while (next) {
                this = next;
                /* postion for next one */
                next = this->m_nextpkt;
                /* check the tag of this packet */
                if (sctp_should_be_moved(this, asoc)) {
                        /* yes this needs to be moved */
                        struct mbuf *mm;
                        *take = this->m_nextpkt;
                        this->m_nextpkt = NULL;
                        *put = this;
                        for (mm = this; mm; mm = mm->m_next) {
                                /*
                                 * Go down the chain and fix
                                 * the space allocation of the
                                 * two sockets.
                                 */
                                sbfree(&old_sb->sb, mm);
                                sballoc(&new_sb->sb, mm);
                        }
                        put = &this->m_nextpkt;

                } else {
                        /* no advance our take point. */
                        take = &this->m_nextpkt;
                }
        }
        if (moved_top) {
                /*
                 * Ok so now we must re-postion vtag_first to
                 * match the new first one since we moved the
                 * mbuf at the top.
                 */
                inp->sctp_vtag_first = sctp_get_first_vtag_from_sb(old);
        }
        SOCKBUF_UNLOCK(old_sb);
        SOCKBUF_UNLOCK(new_sb);
}

void
sctp_free_bufspace(struct sctp_tcb *stcb, struct sctp_association *asoc,
    struct sctp_tmit_chunk *tp1)
{
        if (tp1->data == NULL) {
                return;
        }
#ifdef SCTP_MBCNT_LOGGING
        sctp_log_mbcnt(SCTP_LOG_MBCNT_DECREASE,
                       asoc->total_output_queue_size,
                       tp1->book_size,
                       asoc->total_output_mbuf_queue_size,
                       tp1->mbcnt);
#endif
        if (asoc->total_output_queue_size >= tp1->book_size) {
                asoc->total_output_queue_size -= tp1->book_size;
        } else {
                asoc->total_output_queue_size = 0;
        }

        /* Now free the mbuf */
        if (asoc->total_output_mbuf_queue_size >= tp1->mbcnt) {
                asoc->total_output_mbuf_queue_size -= tp1->mbcnt;
        } else {
                asoc->total_output_mbuf_queue_size = 0;
        }
        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
            (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
                if (stcb->sctp_socket->so_snd.ssb_cc >= tp1->book_size) {
                        stcb->sctp_socket->so_snd.ssb_cc -= tp1->book_size;
                } else {
                        stcb->sctp_socket->so_snd.ssb_cc = 0;

                }
                if (stcb->sctp_socket->so_snd.ssb_mbcnt >= tp1->mbcnt) {
                        stcb->sctp_socket->so_snd.ssb_mbcnt -= tp1->mbcnt;
                } else {
                        stcb->sctp_socket->so_snd.ssb_mbcnt = 0;
                }
        }
}

int
sctp_release_pr_sctp_chunk(struct sctp_tcb *stcb, struct sctp_tmit_chunk *tp1,
    int reason, struct sctpchunk_listhead *queue)
{
        int ret_sz = 0;
        int notdone;
        uint8_t foundeom = 0;

        do {
                ret_sz += tp1->book_size;
                tp1->sent = SCTP_FORWARD_TSN_SKIP;
                if (tp1->data) {
                        sctp_free_bufspace(stcb, &stcb->asoc, tp1);
                        sctp_ulp_notify(SCTP_NOTIFY_DG_FAIL, stcb, reason, tp1);
                        sctp_m_freem(tp1->data);
                        tp1->data = NULL;
                        sctp_sowwakeup(stcb->sctp_ep, stcb->sctp_socket);
                }
                if (tp1->flags & SCTP_PR_SCTP_BUFFER) {
                        stcb->asoc.sent_queue_cnt_removeable--;
                }
                if (queue == &stcb->asoc.send_queue) {
                        TAILQ_REMOVE(&stcb->asoc.send_queue, tp1, sctp_next);
                        /* on to the sent queue */
                        TAILQ_INSERT_TAIL(&stcb->asoc.sent_queue, tp1,
                            sctp_next);
                        stcb->asoc.sent_queue_cnt++;
                }
                if ((tp1->rec.data.rcv_flags & SCTP_DATA_NOT_FRAG) ==
                    SCTP_DATA_NOT_FRAG) {
                        /* not frag'ed we ae done   */
                        notdone = 0;
                        foundeom = 1;
                } else if (tp1->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) {
                        /* end of frag, we are done */
                        notdone = 0;
                        foundeom = 1;
                } else {
                        /* Its a begin or middle piece, we must mark all of it */
                        notdone = 1;
                        tp1 = TAILQ_NEXT(tp1, sctp_next);
                }
        } while (tp1 && notdone);
        if ((foundeom == 0) && (queue == &stcb->asoc.sent_queue)) {
                /*
                 * The multi-part message was scattered
                 * across the send and sent queue.
                 */
                tp1 = TAILQ_FIRST(&stcb->asoc.send_queue);
                /*
                 * recurse throught the send_queue too, starting at the
                 * beginning.
                 */
                if (tp1) {
                        ret_sz += sctp_release_pr_sctp_chunk(stcb, tp1, reason,
                            &stcb->asoc.send_queue);
                } else {
                        kprintf("hmm, nothing on the send queue and no EOM?\n");
                }
        }
        return (ret_sz);
}

/*
 * checks to see if the given address, sa, is one that is currently
 * known by the kernel
 * note: can't distinguish the same address on multiple interfaces and
 *       doesn't handle multiple addresses with different zone/scope id's
 * note: ifa_ifwithaddr() compares the entire sockaddr struct
 */
struct ifaddr *
sctp_find_ifa_by_addr(struct sockaddr *sa)
{
        struct ifnet *ifn;
        struct ifaddr *ifa;

        /* go through all our known interfaces */
        TAILQ_FOREACH(ifn, &ifnet, if_list) {
                /* go through each interface addresses */
                TAILQ_FOREACH(ifa, &ifn->if_addrlist, ifa_list) {
                        /* correct family? */
                        if (ifa->ifa_addr->sa_family != sa->sa_family)
                                continue;

#ifdef INET6
                        if (ifa->ifa_addr->sa_family == AF_INET6) {
                                /* IPv6 address */
                                struct sockaddr_in6 *sin1, *sin2, sin6_tmp;
                                sin1 = (struct sockaddr_in6 *)ifa->ifa_addr;
                                if (IN6_IS_SCOPE_LINKLOCAL(&sin1->sin6_addr)) {
                                        /* create a copy and clear scope */
                                        memcpy(&sin6_tmp, sin1,
                                            sizeof(struct sockaddr_in6));
                                        sin1 = &sin6_tmp;
                                        in6_clearscope(&sin1->sin6_addr);
                                }
                                sin2 = (struct sockaddr_in6 *)sa;
                                if (memcmp(&sin1->sin6_addr, &sin2->sin6_addr,
                                           sizeof(struct in6_addr)) == 0) {
                                        /* found it */
                                        return (ifa);
                                }
                        } else
#endif
                        if (ifa->ifa_addr->sa_family == AF_INET) {
                                /* IPv4 address */
                                struct sockaddr_in *sin1, *sin2;
                                sin1 = (struct sockaddr_in *)ifa->ifa_addr;
                                sin2 = (struct sockaddr_in *)sa;
                                if (sin1->sin_addr.s_addr ==
                                    sin2->sin_addr.s_addr) {
                                        /* found it */
                                        return (ifa);
                                }
                        }
                        /* else, not AF_INET or AF_INET6, so skip */
                } /* end foreach ifa */
        } /* end foreach ifn */
        /* not found! */
        return (NULL);
}


#ifdef __APPLE__
/*
 * here we hack in a fix for Apple's m_copym for the case where the first mbuf
 * in the chain is a M_PKTHDR and the length is zero
 */
static void
sctp_pkthdr_fix(struct mbuf *m)
{
        struct mbuf *m_nxt;

        if ((m->m_flags & M_PKTHDR) == 0) {
                /* not a PKTHDR */
                return;
        }

        if (m->m_len != 0) {
                /* not a zero length PKTHDR mbuf */
                return;
        }

        /* let's move in a word into the first mbuf... yes, ugly! */
        m_nxt = m->m_next;
        if (m_nxt == NULL) {
                /* umm... not a very useful mbuf chain... */
                return;
        }
        if ((size_t)m_nxt->m_len > sizeof(long)) {
                /* move over a long */
                bcopy(mtod(m_nxt, caddr_t), mtod(m, caddr_t), sizeof(long));
                /* update mbuf data pointers and lengths */
                m->m_len += sizeof(long);
                m_nxt->m_data += sizeof(long);
                m_nxt->m_len -= sizeof(long);
        }
}

inline struct mbuf *
sctp_m_copym(struct mbuf *m, int off, int len, int wait)
{
        sctp_pkthdr_fix(m);
        return (m_copym(m, off, len, wait));
}
#endif /* __APPLE__ */