/* $KAME: sctp_pcb.c,v 1.39 2005/06/16 18:29:25 jinmei Exp $ */
/* $NetBSD: sctp_pcb.c,v 1.28 2025/12/10 21:33:03 andvar 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.
 */
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sctp_pcb.c,v 1.28 2025/12/10 21:33:03 andvar Exp $");

#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_sctp.h"
#endif /* _KERNEL_OPT */

#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/kauth.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/callout.h>

#include <machine/limits.h>
#include <machine/cpu.h>

#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>
#include <netinet6/scope6_var.h>
#include <netinet6/in6_pcb.h>
#endif /* INET6 */

#ifdef IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/key.h>
#endif /* IPSEC */

#include <netinet/sctp_var.h>
#include <netinet/sctp_pcb.h>
#include <netinet/sctputil.h>
#include <netinet/sctp.h>
#include <netinet/sctp_header.h>
#include <netinet/sctp_asconf.h>
#include <netinet/sctp_output.h>
#include <netinet/sctp_timer.h>

#ifndef SCTP_PCBHASHSIZE
/* default number of association hash buckets in each endpoint */
#define SCTP_PCBHASHSIZE 256
#endif

#ifdef SCTP_DEBUG
u_int32_t sctp_debug_on = SCTP_DEBUG_ALL;
#endif /* SCTP_DEBUG */

u_int32_t sctp_pegs[SCTP_NUMBER_OF_PEGS];

int sctp_pcbtblsize = SCTP_PCBHASHSIZE;

struct sctp_epinfo sctppcbinfo;

/* FIX: we don't handle multiple link local scopes */
/* "scopeless" replacement IN6_ARE_ADDR_EQUAL */
int
SCTP6_ARE_ADDR_EQUAL(const struct in6_addr *a, const struct in6_addr *b)
{
        struct in6_addr tmp_a, tmp_b;
        /* use a copy of a and b */
        tmp_a = *a;
        tmp_b = *b;
        in6_clearscope(&tmp_a);
        in6_clearscope(&tmp_b);
        return (IN6_ARE_ADDR_EQUAL(&tmp_a, &tmp_b));
}

#if defined(__FreeBSD__) && __FreeBSD_version > 500000

#ifndef xyzzy
void sctp_validate_no_locks(void);

void
SCTP_INP_RLOCK(struct sctp_inpcb *inp)
{
        struct sctp_tcb *stcb;
        LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                if (mtx_owned(&(stcb)->tcb_mtx))
                        panic("I own TCB lock?");
        }
        if (mtx_owned(&(inp)->inp_mtx))
                panic("INP Recursive Lock-R");
        mtx_lock(&(inp)->inp_mtx);
}

void
SCTP_INP_WLOCK(struct sctp_inpcb *inp)
{
        SCTP_INP_RLOCK(inp);
}

void
SCTP_INP_INFO_RLOCK()
{
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;
        LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) {
                if (mtx_owned(&(inp)->inp_mtx))
                        panic("info-lock and own inp lock?");
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        if (mtx_owned(&(stcb)->tcb_mtx))
                                panic("Info lock and own a tcb lock?");
                }
        }
        if (mtx_owned(&sctppcbinfo.ipi_ep_mtx))
                panic("INP INFO Recursive Lock-R");
        mtx_lock(&sctppcbinfo.ipi_ep_mtx);
}

void
SCTP_INP_INFO_WLOCK()
{
        SCTP_INP_INFO_RLOCK();
}


void sctp_validate_no_locks()
{
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;

        if (mtx_owned(&sctppcbinfo.ipi_ep_mtx))
                panic("INP INFO lock is owned?");

        LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) {
                if (mtx_owned(&(inp)->inp_mtx))
                        panic("You own an INP lock?");
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        if (mtx_owned(&(stcb)->tcb_mtx))
                                panic("You own a TCB lock?");
                }
        }
}

#endif
#endif

void
sctp_fill_pcbinfo(struct sctp_pcbinfo *spcb)
{
        /* We really don't need
         * to lock this, but I will
         * just because it does not hurt.
         */
        SCTP_INP_INFO_RLOCK();
        spcb->ep_count = sctppcbinfo.ipi_count_ep;
        spcb->asoc_count = sctppcbinfo.ipi_count_asoc;
        spcb->laddr_count = sctppcbinfo.ipi_count_laddr;
        spcb->raddr_count = sctppcbinfo.ipi_count_raddr;
        spcb->chk_count = sctppcbinfo.ipi_count_chunk;
        spcb->sockq_count = sctppcbinfo.ipi_count_sockq;
        spcb->mbuf_track = sctppcbinfo.mbuf_track;
        SCTP_INP_INFO_RUNLOCK();
}


/*
 * Notes on locks for FreeBSD 5 and up. All association
 * lookups that have a definte ep, the INP structure is
 * assumed to be locked for reading. If we need to go
 * find the INP (usually when a **inp is passed) then
 * we must lock the INFO structure first and if needed
 * lock the INP too. Note that if we lock it we must
 *
 */


/*
 * Given a endpoint, look and find in its association list any association
 * with the "to" address given. This can be a "from" address, too, for
 * inbound packets. For outbound packets it is a true "to" address.
 */
static struct sctp_tcb *
sctp_tcb_special_locate(struct sctp_inpcb **inp_p, struct sockaddr *from,
                        struct sockaddr *to, struct sctp_nets **netp)
{
        /**** ASSUMSES THE CALLER holds the INP_INFO_RLOCK */

        /*
         * Note for this module care must be taken when observing what to is
         * for. In most of the rest of the code the TO field represents my
         * peer and the FROM field represents my address. For this module it
         * is reversed of that.
         */
        /*
         * If we support the TCP model, then we must now dig through to
         * see if we can find our endpoint in the list of tcp ep's.
         */
        uint16_t lport, rport;
        struct sctppcbhead *ephead;
        struct sctp_inpcb *inp;
        struct sctp_laddr *laddr;
        struct sctp_tcb *stcb;
        struct sctp_nets *net;

        if ((to == NULL) || (from == NULL)) {
                return (NULL);
        }

        if (to->sa_family == AF_INET && from->sa_family == AF_INET) {
                lport = ((struct sockaddr_in *)to)->sin_port;
                rport = ((struct sockaddr_in *)from)->sin_port;
        } else if (to->sa_family == AF_INET6 && from->sa_family == AF_INET6) {
                lport = ((struct sockaddr_in6 *)to)->sin6_port;
                rport = ((struct sockaddr_in6 *)from)->sin6_port;
        } else {
                return NULL;
        }
        ephead = &sctppcbinfo.sctp_tcpephash[SCTP_PCBHASH_ALLADDR(
                                                     (lport + rport), sctppcbinfo.hashtcpmark)];
        /*
         * Ok now for each of the guys in this bucket we must look
         * and see:
         *  - Does the remote port match.
         *  - Does there single association's addresses match this
         *    address (to).
         * If so we update p_ep to point to this ep and return the
         * tcb from it.
         */
        LIST_FOREACH(inp, ephead, sctp_hash) {
                if (lport != inp->sctp_lport) {
                        continue;
                }
                SCTP_INP_RLOCK(inp);
                /* check to see if the ep has one of the addresses */
                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                        /* We are NOT bound all, so look further */
                        int match = 0;

                        LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                                if (laddr->ifa == NULL) {
#ifdef SCTP_DEBUG
                                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                                printf("An ounce of prevention is worth a pound of cure\n");
                                        }
#endif
                                        continue;
                                }
                                if (laddr->ifa->ifa_addr == NULL) {
#ifdef SCTP_DEBUG
                                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                                printf("ifa with a NULL address\n");
                                        }
#endif
                                        continue;
                                }
                                if (laddr->ifa->ifa_addr->sa_family ==
                                    to->sa_family) {
                                        /* see if it matches */
                                        struct sockaddr_in *intf_addr, *sin;
                                        intf_addr = (struct sockaddr_in *)
                                                laddr->ifa->ifa_addr;
                                        sin = (struct sockaddr_in *)to;
                                        if (from->sa_family == AF_INET) {
                                                if (sin->sin_addr.s_addr ==
                                                    intf_addr->sin_addr.s_addr) {
                                                        match = 1;
                                                        SCTP_INP_RUNLOCK(inp);
                                                        break;
                                                }
                                        } else {
                                                struct sockaddr_in6 *intf_addr6;
                                                struct sockaddr_in6 *sin6;
                                                sin6 = (struct sockaddr_in6 *)
                                                        to;
                                                intf_addr6 = (struct sockaddr_in6 *)
                                                        laddr->ifa->ifa_addr;

                                                if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                                                         &intf_addr6->sin6_addr)) {
                                                        match = 1;
                                                        SCTP_INP_RUNLOCK(inp);
                                                        break;
                                                }
                                        }
                                }
                        }
                        if (match == 0) {
                                /* This endpoint does not have this address */
                                SCTP_INP_RUNLOCK(inp);
                                continue;
                        }
                }
                /*
                 * Ok if we hit here the ep has the address, does it hold the
                 * tcb?
                 */

                stcb = LIST_FIRST(&inp->sctp_asoc_list);
                if (stcb == NULL) {
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                }
                SCTP_TCB_LOCK(stcb);
                if (stcb->rport != rport) {
                        /* remote port does not match. */
                        SCTP_TCB_UNLOCK(stcb);
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                }
                /* Does this TCB have a matching address? */
                TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                        if (sctp_cmpaddr(from, rtcache_getdst(&net->ro))) {
                                /* found it */
                                if (netp != NULL) {
                                        *netp = net;
                                }
                                /* Update the endpoint pointer */
                                *inp_p = inp;
                                SCTP_INP_RUNLOCK(inp);
                                return (stcb);
                        }
                }
                SCTP_TCB_UNLOCK(stcb);

                SCTP_INP_RUNLOCK(inp);
        }
        return (NULL);
}

struct sctp_tcb *
sctp_findassociation_ep_asconf(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp)
{
        struct sctp_tcb *stcb;
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6;
        struct sockaddr_storage local_store, remote_store;
        struct ip *iph;
        struct sctp_paramhdr parm_buf, *phdr;
        int ptype;

        memset(&local_store, 0, sizeof(local_store));
        memset(&remote_store, 0, sizeof(remote_store));

        /* First get the destination address setup too. */
        iph = mtod(m, struct ip *);
        if (iph->ip_v == IPVERSION) {
                /* its IPv4 */
                sin = (struct sockaddr_in *)&local_store;
                sin->sin_family = AF_INET;
                sin->sin_len = sizeof(*sin);
                sin->sin_port = sh->dest_port;
                sin->sin_addr.s_addr = iph->ip_dst.s_addr ;
        } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                /* its IPv6 */
                struct ip6_hdr *ip6;
                ip6 = mtod(m, struct ip6_hdr *);
                sin6 = (struct sockaddr_in6 *)&local_store;
                sin6->sin6_family = AF_INET6;
                sin6->sin6_len = sizeof(*sin6);
                sin6->sin6_port = sh->dest_port;
                sin6->sin6_addr = ip6->ip6_dst;
        } else {
                return NULL;
        }

        phdr = sctp_get_next_param(m, offset + sizeof(struct sctp_asconf_chunk),
            &parm_buf, sizeof(struct sctp_paramhdr));
        if (phdr == NULL) {
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
                        printf("sctp_process_control: failed to get asconf lookup addr\n");
                }
#endif /* SCTP_DEBUG */
                return NULL;
        }
        ptype = (int)((u_int)ntohs(phdr->param_type));
        /* get the correlation address */
        if (ptype == SCTP_IPV6_ADDRESS) {
                /* ipv6 address param */
                struct sctp_ipv6addr_param *p6, p6_buf;
                if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv6addr_param)) {
                        return NULL;
                }

                p6 = (struct sctp_ipv6addr_param *)sctp_get_next_param(m,
                    offset + sizeof(struct sctp_asconf_chunk),
                    &p6_buf.ph, sizeof(*p6));
                if (p6 == NULL) {
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
                                printf("sctp_process_control: failed to get asconf v6 lookup addr\n");
                        }
#endif /* SCTP_DEBUG */
                        return (NULL);
                }
                sin6 = (struct sockaddr_in6 *)&remote_store;
                sin6->sin6_family = AF_INET6;
                sin6->sin6_len = sizeof(*sin6);
                sin6->sin6_port = sh->src_port;
                memcpy(&sin6->sin6_addr, &p6->addr, sizeof(struct in6_addr));
        } else if (ptype == SCTP_IPV4_ADDRESS) {
                /* ipv4 address param */
                struct sctp_ipv4addr_param *p4, p4_buf;
                if (ntohs(phdr->param_length) != sizeof(struct sctp_ipv4addr_param)) {
                        return NULL;
                }

                p4 = (struct sctp_ipv4addr_param *)sctp_get_next_param(m,
                    offset + sizeof(struct sctp_asconf_chunk),
                    &p4_buf.ph, sizeof(*p4));
                if (p4 == NULL) {
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_INPUT3) {
                                printf("sctp_process_control: failed to get asconf v4 lookup addr\n");
                        }
#endif /* SCTP_DEBUG */
                        return (NULL);
                }
                sin = (struct sockaddr_in *)&remote_store;
                sin->sin_family = AF_INET;
                sin->sin_len = sizeof(*sin);
                sin->sin_port = sh->src_port;
                memcpy(&sin->sin_addr, &p4->addr, sizeof(struct in_addr));
        } else {
                /* invalid address param type */
                return NULL;
        }

        stcb = sctp_findassociation_ep_addr(inp_p,
            (struct sockaddr *)&remote_store, netp,
            (struct sockaddr *)&local_store, NULL);
        return (stcb);
}

struct sctp_tcb *
sctp_findassociation_ep_addr(struct sctp_inpcb **inp_p, struct sockaddr *remote,
    struct sctp_nets **netp, struct sockaddr *local, struct sctp_tcb *locked_tcb)
{
        struct sctpasochead *head;
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;
        struct sctp_nets *net;
        uint16_t rport;

        inp = *inp_p;
        if (remote->sa_family == AF_INET) {
                rport = (((struct sockaddr_in *)remote)->sin_port);
        } else if (remote->sa_family == AF_INET6) {
                rport = (((struct sockaddr_in6 *)remote)->sin6_port);
        } else {
                return (NULL);
        }
        if (locked_tcb) {
                /* UN-lock so we can do proper locking here
                 * this occurs when called from load_addresses_from_init.
                 */
                SCTP_TCB_UNLOCK(locked_tcb);
        }
        SCTP_INP_INFO_RLOCK();
        if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
                /*
                 * Now either this guy is our listner or it's the connector.
                 * If it is the one that issued the connect, then it's only
                 * chance is to be the first TCB in the list. If it is the
                 * acceptor, then do the special_lookup to hash and find the
                 * real inp.
                 */
                if (inp->sctp_flags & SCTP_PCB_FLAGS_ACCEPTING) {
                        /* to is peer addr, from is my addr */
                        stcb = sctp_tcb_special_locate(inp_p, remote, local,
                                                       netp);
                        if ((stcb != NULL) && (locked_tcb == NULL)){
                                /* we have a locked tcb, lower refcount */
                                SCTP_INP_WLOCK(inp);
                                SCTP_INP_DECR_REF(inp);
                                SCTP_INP_WUNLOCK(inp);
                        }
                        if (locked_tcb != NULL) {
                                SCTP_INP_RLOCK(locked_tcb->sctp_ep);
                                SCTP_TCB_LOCK(locked_tcb);
                                SCTP_INP_RUNLOCK(locked_tcb->sctp_ep);
                                if (stcb != NULL) {
                                        SCTP_TCB_UNLOCK(stcb);
                                }
                        }
                        SCTP_INP_INFO_RUNLOCK();
                        return (stcb);
                } else {
                        SCTP_INP_WLOCK(inp);
                        stcb = LIST_FIRST(&inp->sctp_asoc_list);
                        if (stcb == NULL) {
                                goto null_return;
                        }
                        SCTP_TCB_LOCK(stcb);
                        if (stcb->rport != rport) {
                                /* remote port does not match. */
                                SCTP_TCB_UNLOCK(stcb);
                                goto null_return;
                        }
                        /* now look at the list of remote addresses */
                        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                if (sctp_cmpaddr(remote, rtcache_getdst(&net->ro))) {
                                        /* found it */
                                        if (netp != NULL) {
                                                *netp = net;
                                        }
                                        if (locked_tcb == NULL) {
                                                SCTP_INP_DECR_REF(inp);
                                        }
                                        SCTP_INP_WUNLOCK(inp);
                                        SCTP_INP_INFO_RUNLOCK();
                                        return (stcb);
                                }
                        }
                        SCTP_TCB_UNLOCK(stcb);
                }
        } else {
                SCTP_INP_WLOCK(inp);
                head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(rport,
                                                               inp->sctp_hashmark)];
                if (head == NULL) {
                        goto null_return;
                }
                LIST_FOREACH(stcb, head, sctp_tcbhash) {
                        if (stcb->rport != rport) {
                                /* remote port does not match */
                                continue;
                        }
                        /* now look at the list of remote addresses */
                        SCTP_TCB_LOCK(stcb);
                        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                if (sctp_cmpaddr(remote, rtcache_getdst(&net->ro))) {
                                        /* found it */
                                        if (netp != NULL) {
                                                *netp = net;
                                        }
                                        if (locked_tcb == NULL) {
                                                SCTP_INP_DECR_REF(inp);
                                        }
                                        SCTP_INP_WUNLOCK(inp);
                                        SCTP_INP_INFO_RUNLOCK();
                                        return (stcb);
                                }
                        }
                        SCTP_TCB_UNLOCK(stcb);
                }
        }
 null_return:
        /* clean up for returning null */
        if (locked_tcb){
                if (locked_tcb->sctp_ep != inp) {
                        SCTP_INP_RLOCK(locked_tcb->sctp_ep);
                        SCTP_TCB_LOCK(locked_tcb);
                        SCTP_INP_RUNLOCK(locked_tcb->sctp_ep);
                } else {
                        SCTP_TCB_LOCK(locked_tcb);
                }
        }
        SCTP_INP_WUNLOCK(inp);
        SCTP_INP_INFO_RUNLOCK();
        /* not found */
        return (NULL);
}

/*
 * Find an association for a specific endpoint using the association id
 * given out in the COMM_UP notification
 */
struct sctp_tcb *
sctp_findassociation_ep_asocid(struct sctp_inpcb *inp, vaddr_t asoc_id)
{
        /*
         * Use my the assoc_id to find a endpoint
         */
        struct sctpasochead *head;
        struct sctp_tcb *stcb;
        u_int32_t vtag;

        if (asoc_id == 0 || inp == NULL) {
                return (NULL);
        }
        SCTP_INP_INFO_RLOCK();
        vtag = (u_int32_t)asoc_id;
        head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(vtag,
            sctppcbinfo.hashasocmark)];
        if (head == NULL) {
                /* invalid vtag */
                SCTP_INP_INFO_RUNLOCK();
                return (NULL);
        }
        LIST_FOREACH(stcb, head, sctp_asocs) {
                SCTP_INP_RLOCK(stcb->sctp_ep);
                SCTP_TCB_LOCK(stcb);
                SCTP_INP_RUNLOCK(stcb->sctp_ep);
                if (stcb->asoc.my_vtag == vtag) {
                        /* candidate */
                        if (inp != stcb->sctp_ep) {
                                /* some other guy has the
                                 * same vtag active (vtag collision).
                                 */
                                sctp_pegs[SCTP_VTAG_BOGUS]++;
                                SCTP_TCB_UNLOCK(stcb);
                                continue;
                        }
                        sctp_pegs[SCTP_VTAG_EXPR]++;
                        SCTP_INP_INFO_RUNLOCK();
                        return (stcb);
                }
                SCTP_TCB_UNLOCK(stcb);
        }
        SCTP_INP_INFO_RUNLOCK();
        return (NULL);
}

static struct sctp_inpcb *
sctp_endpoint_probe(struct sockaddr *nam, struct sctppcbhead *head,
                    uint16_t lport)
{
        struct sctp_inpcb *inp;
        struct sockaddr_in *sin;
        struct sockaddr_in6 *sin6;
        struct sctp_laddr *laddr;

        /* Endpoint probe expects
         * that the INP_INFO is locked.
         */
        if (nam->sa_family == AF_INET) {
                sin = (struct sockaddr_in *)nam;
                sin6 = NULL;
        } else if (nam->sa_family == AF_INET6) {
                sin6 = (struct sockaddr_in6 *)nam;
                sin = NULL;
        } else {
                /* unsupported family */
                return (NULL);
        }
        if (head == NULL)
                return (NULL);

        LIST_FOREACH(inp, head, sctp_hash) {
                SCTP_INP_RLOCK(inp);

                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) &&
                    (inp->sctp_lport == lport)) {
                        /* got it */
                        if ((nam->sa_family == AF_INET) &&
                            (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                            (((struct in6pcb *)inp)->in6p_flags & IN6P_IPV6_V6ONLY)
                                ) {
                                /* IPv4 on a IPv6 socket with ONLY IPv6 set */
                                SCTP_INP_RUNLOCK(inp);
                                continue;
                        }
                        /* A V6 address and the endpoint is NOT bound V6 */
                        if (nam->sa_family == AF_INET6 &&
                           (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                                SCTP_INP_RUNLOCK(inp);
                                continue;
                        }
                        SCTP_INP_RUNLOCK(inp);
                        return (inp);
                }
                SCTP_INP_RUNLOCK(inp);
        }

        if ((nam->sa_family == AF_INET) &&
            (sin->sin_addr.s_addr == INADDR_ANY)) {
                /* Can't hunt for one that has no address specified */
                return (NULL);
        } else if ((nam->sa_family == AF_INET6) &&
                   (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))) {
                /* Can't hunt for one that has no address specified */
                return (NULL);
        }
        /*
         * ok, not bound to all so see if we can find a EP bound to this
         * address.
         */
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Ok, there is NO bound-all available for port:%x\n", ntohs(lport));
        }
#endif
        LIST_FOREACH(inp, head, sctp_hash) {
                SCTP_INP_RLOCK(inp);
                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)) {
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                }
                /*
                 * Ok this could be a likely candidate, look at all of
                 * its addresses
                 */
                if (inp->sctp_lport != lport) {
                        SCTP_INP_RUNLOCK(inp);
                        continue;
                }
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                        printf("Ok, found matching local port\n");
                }
#endif
                LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                        if (laddr->ifa == NULL) {
#ifdef SCTP_DEBUG
                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                        printf("An ounce of prevention is worth a pound of cure\n");
                                }
#endif
                                continue;
                        }
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                printf("Ok laddr->ifa:%p is possible, ",
                                    laddr->ifa);
                        }
#endif
                        if (laddr->ifa->ifa_addr == NULL) {
#ifdef SCTP_DEBUG
                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                        printf("Huh IFA as an ifa_addr=NULL, ");
                                }
#endif
                                continue;
                        }
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                printf("Ok laddr->ifa:%p is possible, ",
                                    laddr->ifa->ifa_addr);
                                sctp_print_address(laddr->ifa->ifa_addr);
                                printf("looking for ");
                                sctp_print_address(nam);
                        }
#endif
                        if (laddr->ifa->ifa_addr->sa_family == nam->sa_family) {
                                /* possible, see if it matches */
                                struct sockaddr_in *intf_addr;
                                intf_addr = (struct sockaddr_in *)
                                    laddr->ifa->ifa_addr;
                                if (nam->sa_family == AF_INET) {
                                        if (sin->sin_addr.s_addr ==
                                            intf_addr->sin_addr.s_addr) {
#ifdef SCTP_DEBUG
                                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                                        printf("YES, return ep:%p\n", inp);
                                                }
#endif
                                                SCTP_INP_RUNLOCK(inp);
                                                return (inp);
                                        }
                                } else if (nam->sa_family == AF_INET6) {
                                        struct sockaddr_in6 *intf_addr6;
                                        intf_addr6 = (struct sockaddr_in6 *)
                                            laddr->ifa->ifa_addr;
                                        if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                            &intf_addr6->sin6_addr)) {
#ifdef SCTP_DEBUG
                                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                                        printf("YES, return ep:%p\n", inp);
                                                }
#endif
                                                SCTP_INP_RUNLOCK(inp);
                                                return (inp);
                                        }
                                }
                        }
                        SCTP_INP_RUNLOCK(inp);
                }
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("NO, Falls out to NULL\n");
        }
#endif
        return (NULL);
}


struct sctp_inpcb *
sctp_pcb_findep(struct sockaddr *nam, int find_tcp_pool, int have_lock)
{
        /*
         * First we check the hash table to see if someone has this port
         * bound with just the port.
         */
        struct sctp_inpcb *inp;
        struct sctppcbhead *head;
        int lport;
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Looking for endpoint %d :",
                       ntohs(((struct sockaddr_in *)nam)->sin_port));
                sctp_print_address(nam);
        }
#endif
        if (nam->sa_family == AF_INET) {
                lport = ((struct sockaddr_in *)nam)->sin_port;
        } else if (nam->sa_family == AF_INET6) {
                lport = ((struct sockaddr_in6 *)nam)->sin6_port;
        } else {
                /* unsupported family */
                return (NULL);
        }
        /*
         * I could cheat here and just cast to one of the types but we will
         * do it right. It also provides the check against an Unsupported
         * type too.
         */
        /* Find the head of the ALLADDR chain */
        if (have_lock == 0) {
                SCTP_INP_INFO_RLOCK();
        }
        head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
                                                             sctppcbinfo.hashmark)];
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Main hash to lookup at head:%p\n", head);
        }
#endif
        inp = sctp_endpoint_probe(nam, head, lport);

        /*
         * If the TCP model exists it could be that the main listening
         * endpoint is gone but there exists a connected socket for this
         * guy yet. If so we can return the first one that we find. This
         * may NOT be the correct one but the sctp_findassociation_ep_addr
         * has further code to look at all TCP models.
         */
        if (inp == NULL && find_tcp_pool) {
                unsigned int i;
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                        printf("EP was NULL and TCP model is supported\n");
                }
#endif
                for (i = 0; i < sctppcbinfo.hashtblsize; i++) {
                        /*
                         * This is real gross, but we do NOT have a remote
                         * port at this point depending on who is calling. We
                         * must therefore look for ANY one that matches our
                         * local port :/
                         */
                        head = &sctppcbinfo.sctp_tcpephash[i];
                        if (LIST_FIRST(head)) {
                                inp = sctp_endpoint_probe(nam, head, lport);
                                if (inp) {
                                        /* Found one */
                                        break;
                                }
                        }
                }
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("EP to return is %p\n", inp);
        }
#endif
        if (have_lock == 0) {
                if (inp) {
                        SCTP_INP_WLOCK(inp);
                        SCTP_INP_INCR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                }
                SCTP_INP_INFO_RUNLOCK();
        } else {
                if (inp) {
                        SCTP_INP_WLOCK(inp);
                        SCTP_INP_INCR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                }
        }
        return (inp);
}

/*
 * Find an association for an endpoint with the pointer to whom you want
 * to send to and the endpoint pointer. The address can be IPv4 or IPv6.
 * We may need to change the *to to some other struct like a mbuf...
 */
struct sctp_tcb *
sctp_findassociation_addr_sa(struct sockaddr *to, struct sockaddr *from,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp, int find_tcp_pool)
{
        struct sctp_inpcb *inp;
        struct sctp_tcb *retval;

        SCTP_INP_INFO_RLOCK();
        if (find_tcp_pool) {
                if (inp_p != NULL) {
                        retval = sctp_tcb_special_locate(inp_p, from, to, netp);
                } else {
                        retval = sctp_tcb_special_locate(&inp, from, to, netp);
                }
                if (retval != NULL) {
                        SCTP_INP_INFO_RUNLOCK();
                        return (retval);
                }
        }
        inp = sctp_pcb_findep(to, 0, 1);
        if (inp_p != NULL) {
                *inp_p = inp;
        }
        SCTP_INP_INFO_RUNLOCK();

        if (inp == NULL) {
                return (NULL);
        }

        /*
         * ok, we have an endpoint, now lets find the assoc for it (if any)
         * we now place the source address or from in the to of the find
         * endpoint call. Since in reality this chain is used from the
         * inbound packet side.
         */
        if (inp_p != NULL) {
                return (sctp_findassociation_ep_addr(inp_p, from, netp, to, NULL));
        } else {
                return (sctp_findassociation_ep_addr(&inp, from, netp, to, NULL));
        }
}


/*
 * This routine will grub through the mbuf that is a INIT or INIT-ACK and
 * find all addresses that the sender has specified in any address list.
 * Each address will be used to lookup the TCB and see if one exits.
 */
static struct sctp_tcb *
sctp_findassociation_special_addr(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_inpcb **inp_p, struct sctp_nets **netp,
    struct sockaddr *dest)
{
        struct sockaddr_in sin4;
        struct sockaddr_in6 sin6;
        struct sctp_paramhdr *phdr, parm_buf;
        struct sctp_tcb *retval;
        u_int32_t ptype, plen;

        memset(&sin4, 0, sizeof(sin4));
        memset(&sin6, 0, sizeof(sin6));
        sin4.sin_len = sizeof(sin4);
        sin4.sin_family = AF_INET;
        sin4.sin_port = sh->src_port;
        sin6.sin6_len = sizeof(sin6);
        sin6.sin6_family = AF_INET6;
        sin6.sin6_port = sh->src_port;

        retval = NULL;
        offset += sizeof(struct sctp_init_chunk);

        phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf));
        while (phdr != NULL) {
                /* now we must see if we want the parameter */
                ptype = ntohs(phdr->param_type);
                plen = ntohs(phdr->param_length);
                if (plen == 0) {
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                printf("sctp_findassociation_special_addr: Impossible length in parameter\n");
                        }
#endif /* SCTP_DEBUG */
                        break;
                }
                if (ptype == SCTP_IPV4_ADDRESS &&
                    plen == sizeof(struct sctp_ipv4addr_param)) {
                        /* Get the rest of the address */
                        struct sctp_ipv4addr_param ip4_parm, *p4;

                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&ip4_parm, plen);
                        if (phdr == NULL) {
                                return (NULL);
                        }
                        p4 = (struct sctp_ipv4addr_param *)phdr;
                        memcpy(&sin4.sin_addr, &p4->addr, sizeof(p4->addr));
                        /* look it up */
                        retval = sctp_findassociation_ep_addr(inp_p,
                            (struct sockaddr *)&sin4, netp, dest, NULL);
                        if (retval != NULL) {
                                return (retval);
                        }
                } else if (ptype == SCTP_IPV6_ADDRESS &&
                    plen == sizeof(struct sctp_ipv6addr_param)) {
                        /* Get the rest of the address */
                        struct sctp_ipv6addr_param ip6_parm, *p6;

                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&ip6_parm, plen);
                        if (phdr == NULL) {
                                return (NULL);
                        }
                        p6 = (struct sctp_ipv6addr_param *)phdr;
                        memcpy(&sin6.sin6_addr, &p6->addr, sizeof(p6->addr));
                        /* look it up */
                        retval = sctp_findassociation_ep_addr(inp_p,
                            (struct sockaddr *)&sin6, netp, dest, NULL);
                        if (retval != NULL) {
                                return (retval);
                        }
                }
                offset += SCTP_SIZE32(plen);
                phdr = sctp_get_next_param(m, offset, &parm_buf,
                    sizeof(parm_buf));
        }
        return (NULL);
}

static struct sctp_tcb *
sctp_findassoc_by_vtag(struct sockaddr *from, uint32_t vtag,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp, uint16_t rport,
    uint16_t lport)
{
        /*
         * Use my vtag to hash. If we find it we then verify the source addr
         * is in the assoc. If all goes well we save a bit on rec of a packet.
         */
        struct sctpasochead *head;
        struct sctp_nets *net;
        struct sctp_tcb *stcb;

        SCTP_INP_INFO_RLOCK();
        head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(vtag,
            sctppcbinfo.hashasocmark)];
        if (head == NULL) {
                /* invalid vtag */
                SCTP_INP_INFO_RUNLOCK();
                return (NULL);
        }
        LIST_FOREACH(stcb, head, sctp_asocs) {
                SCTP_INP_RLOCK(stcb->sctp_ep);
                SCTP_TCB_LOCK(stcb);
                SCTP_INP_RUNLOCK(stcb->sctp_ep);
                if (stcb->asoc.my_vtag == vtag) {
                        /* candidate */
                        if (stcb->rport != rport) {
                                /*
                                 * we could remove this if vtags are unique
                                 * across the system.
                                 */
                                SCTP_TCB_UNLOCK(stcb);
                                continue;
                        }
                        if (stcb->sctp_ep->sctp_lport != lport) {
                                /*
                                 * we could remove this if vtags are unique
                                 * across the system.
                                 */
                                SCTP_TCB_UNLOCK(stcb);
                                continue;
                        }
                        net = sctp_findnet(stcb, from);
                        if (net) {
                                /* yep its him. */
                                *netp = net;
                                sctp_pegs[SCTP_VTAG_EXPR]++;
                                *inp_p = stcb->sctp_ep;
                                SCTP_INP_INFO_RUNLOCK();
                                return (stcb);
                        } else {
                                /* not him, this should only
                                 * happen in rare cases so
                                 * I peg it.
                                 */
                                sctp_pegs[SCTP_VTAG_BOGUS]++;
                        }
                }
                SCTP_TCB_UNLOCK(stcb);
        }
        SCTP_INP_INFO_RUNLOCK();
        return (NULL);
}

/*
 * Find an association with the pointer to the inbound IP packet. This
 * can be a IPv4 or IPv6 packet.
 */
struct sctp_tcb *
sctp_findassociation_addr(struct mbuf *m, int iphlen, int offset,
    struct sctphdr *sh, struct sctp_chunkhdr *ch,
    struct sctp_inpcb **inp_p, struct sctp_nets **netp)
{
        int find_tcp_pool;
        struct ip *iph;
        struct sctp_tcb *retval;
        struct sockaddr_storage to_store, from_store;
        struct sockaddr *to = (struct sockaddr *)&to_store;
        struct sockaddr *from = (struct sockaddr *)&from_store;
        struct sctp_inpcb *inp;


        iph = mtod(m, struct ip *);
        if (iph->ip_v == IPVERSION) {
                /* its IPv4 */
                struct sockaddr_in *to4, *from4;

                to4 = (struct sockaddr_in *)&to_store;
                from4 = (struct sockaddr_in *)&from_store;
                memset(to4, 0, sizeof(*to4));
                memset(from4, 0, sizeof(*from4));
                from4->sin_family = to4->sin_family = AF_INET;
                from4->sin_len = to4->sin_len = sizeof(struct sockaddr_in);
                from4->sin_addr.s_addr  = iph->ip_src.s_addr;
                to4->sin_addr.s_addr = iph->ip_dst.s_addr ;
                from4->sin_port = sh->src_port;
                to4->sin_port = sh->dest_port;
        } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                /* its IPv6 */
                struct ip6_hdr *ip6;
                struct sockaddr_in6 *to6, *from6;

                ip6 = mtod(m, struct ip6_hdr *);
                to6 = (struct sockaddr_in6 *)&to_store;
                from6 = (struct sockaddr_in6 *)&from_store;
                memset(to6, 0, sizeof(*to6));
                memset(from6, 0, sizeof(*from6));
                from6->sin6_family = to6->sin6_family = AF_INET6;
                from6->sin6_len = to6->sin6_len = sizeof(struct sockaddr_in6);
                from6->sin6_addr = ip6->ip6_src;
                to6->sin6_addr = ip6->ip6_dst;
                from6->sin6_port = sh->src_port;
                to6->sin6_port = sh->dest_port;
                /* Get the scopes in properly to the sin6 addr's */
#if defined(SCTP_BASE_FREEBSD) || defined(__APPLE__)
                /* We probably don't need this operation (jinmei@kame) */
                (void)in6_recoverscope(to6, &to6->sin6_addr, NULL);
                (void)in6_embedscope(&to6->sin6_addr, to6, NULL, NULL);

                (void)in6_recoverscope(from6, &from6->sin6_addr, NULL);
                (void)in6_embedscope(&from6->sin6_addr, from6, NULL, NULL);
#endif
        } else {
                /* Currently not supported. */
                return (NULL);
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Looking for port %d address :",
                       ntohs(((struct sockaddr_in *)to)->sin_port));
                sctp_print_address(to);
                printf("From for port %d address :",
                       ntohs(((struct sockaddr_in *)from)->sin_port));
                sctp_print_address(from);
        }
#endif

        if (sh->v_tag) {
                /* we only go down this path if vtag is non-zero */
                retval = sctp_findassoc_by_vtag(from, ntohl(sh->v_tag),
                    inp_p, netp, sh->src_port, sh->dest_port);
                if (retval) {
                        return (retval);
                }
        }
        find_tcp_pool = 0;
        if ((ch->chunk_type != SCTP_INITIATION) &&
            (ch->chunk_type != SCTP_INITIATION_ACK) &&
            (ch->chunk_type != SCTP_COOKIE_ACK) &&
            (ch->chunk_type != SCTP_COOKIE_ECHO)) {
                /* Other chunk types go to the tcp pool. */
                find_tcp_pool = 1;
        }
        if (inp_p) {
                retval = sctp_findassociation_addr_sa(to, from, inp_p, netp,
                    find_tcp_pool);
                inp = *inp_p;
        } else {
                retval = sctp_findassociation_addr_sa(to, from, &inp, netp,
                    find_tcp_pool);
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("retval:%p inp:%p\n", retval, inp);
        }
#endif
        if (retval == NULL && inp) {
                /* Found a EP but not this address */
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                        printf("Found endpoint %p but no asoc - ep state:%x\n",
                            inp, inp->sctp_flags);
                }
#endif
                if ((ch->chunk_type == SCTP_INITIATION) ||
                    (ch->chunk_type == SCTP_INITIATION_ACK)) {
                        /*
                         * special hook, we do NOT return linp or an
                         * association that is linked to an existing
                         * association that is under the TCP pool (i.e. no
                         * listener exists). The endpoint finding routine
                         * will always find a listner before examining the
                         * TCP pool.
                         */
                        if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
#ifdef SCTP_DEBUG
                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                        printf("Gak, its in the TCP pool... return NULL");
                                }
#endif
                                if (inp_p) {
                                        *inp_p = NULL;
                                }
                                return (NULL);
                        }
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                printf("Now doing SPECIAL find\n");
                        }
#endif
                        retval = sctp_findassociation_special_addr(m, iphlen,
                            offset, sh, inp_p, netp, to);
                }
        }
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
            printf("retval is %p\n", retval);
        }
#endif
        return (retval);
}

extern int sctp_max_burst_default;

extern unsigned int sctp_delayed_sack_time_default;
extern unsigned int sctp_heartbeat_interval_default;
extern unsigned int sctp_pmtu_raise_time_default;
extern unsigned int sctp_shutdown_guard_time_default;
extern unsigned int sctp_secret_lifetime_default;

extern unsigned int sctp_rto_max_default;
extern unsigned int sctp_rto_min_default;
extern unsigned int sctp_rto_initial_default;
extern unsigned int sctp_init_rto_max_default;
extern unsigned int sctp_valid_cookie_life_default;
extern unsigned int sctp_init_rtx_max_default;
extern unsigned int sctp_assoc_rtx_max_default;
extern unsigned int sctp_path_rtx_max_default;
extern unsigned int sctp_nr_outgoing_streams_default;

/*
 * allocate a sctp_inpcb and setup a temporary binding to a port/all
 * addresses. This way if we don't get a bind we by default pick a ephemeral
 * port with all addresses bound.
 */
int
sctp_inpcb_alloc(struct socket *so)
{
        /*
         * we get called when a new endpoint starts up. We need to allocate
         * the sctp_inpcb structure from the zone and init it. Mark it as
         * unbound and find a port that we can use as an ephemeral with
         * INADDR_ANY. If the user binds later no problem we can then add
         * in the specific addresses. And setup the default parameters for
         * the EP.
         */
        int i, error;
        struct sctp_inpcb *inp;
#ifdef DEBUG
        struct sctp_inpcb *n_inp;
#endif
#ifdef IPSEC
        struct inpcbpolicy *pcb_sp = NULL;
#endif
        struct sctp_pcb *m;
        struct timeval time;

        error = 0;

        /* Hack alert:
         *
         * This code audits the entire INP list to see if
         * any ep's that are in the GONE state are now
         * all free. This should not happen really since when
         * the last association if freed we should end up deleting
         * the inpcb. This code including the locks should
         * be taken out ... since the last set of fixes I
         * have not seen the "Found a GONE on list" has not
         * came out. But i am paranoid and we will leave this
         * in at the cost of efficiency on allocation of PCB's.
         * Probably we should move this to the invariant
         * compile options
         */
#ifdef DEBUG
        SCTP_INP_INFO_RLOCK();
        inp = LIST_FIRST(&sctppcbinfo.listhead);
        while (inp) {
                n_inp = LIST_NEXT(inp, sctp_list);
                if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                        if (LIST_FIRST(&inp->sctp_asoc_list) == NULL) {
                                /* finish the job now */
                                printf("Found a GONE on list\n");
                                SCTP_INP_INFO_RUNLOCK();
                                sctp_inpcb_free(inp, 1);
                                SCTP_INP_INFO_RLOCK();
                        }
                }
                inp = n_inp;
        }
        SCTP_INP_INFO_RUNLOCK();
#endif /* DEBUG */

        SCTP_INP_INFO_WLOCK();
        inp = (struct sctp_inpcb *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_ep);
        if (inp == NULL) {
                printf("Out of SCTP-INPCB structures - no resources\n");
                SCTP_INP_INFO_WUNLOCK();
                return (ENOBUFS);
        }

        /* zap it */
        memset(inp, 0, sizeof(*inp));

        /* setup socket pointers */
        inp->sctp_socket = so;

        /* setup inpcb socket too */
        inp->ip_inp.inp.inp_socket = so;
        inp->sctp_frag_point = SCTP_DEFAULT_MAXSEGMENT;
#ifdef IPSEC
        if (ipsec_enabled) {
                error = ipsec_init_pcbpolicy(so, &pcb_sp);
                if (error != 0) {
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
                        SCTP_INP_INFO_WUNLOCK();
                        return error;
                }
                /* Arrange to share the policy */
                inp->ip_inp.inp.inp_sp = pcb_sp;
                pcb_sp->sp_inph = (struct inpcb_hdr *)inp;
        }
#endif /* IPSEC */
        sctppcbinfo.ipi_count_ep++;
        inp->inp_ip_ttl = ip_defttl;
        inp->inp_ip_tos = 0;

        so->so_pcb = (void *)inp;

        if ((so->so_type == SOCK_DGRAM) ||
            (so->so_type == SOCK_SEQPACKET)) {
                /* UDP style socket */
                inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
                    SCTP_PCB_FLAGS_UNBOUND);
                inp->sctp_flags |= (SCTP_PCB_FLAGS_RECVDATAIOEVNT);
                /* Be sure it is NON-BLOCKING IO for UDP */
                /*so->so_state |= SS_NBIO;*/
        } else if (so->so_type == SOCK_STREAM) {
                /* TCP style socket */
                inp->sctp_flags = (SCTP_PCB_FLAGS_TCPTYPE |
                    SCTP_PCB_FLAGS_UNBOUND);
                inp->sctp_flags |= (SCTP_PCB_FLAGS_RECVDATAIOEVNT);
                /* Be sure we have blocking IO bu default */
                so->so_state &= ~SS_NBIO;
        } else {
                /*
                 * unsupported socket type (RAW, etc)- in case we missed
                 * it in protosw
                 */
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
                SCTP_INP_INFO_WUNLOCK();
                return (EOPNOTSUPP);
        }
        inp->sctp_tcbhash = SCTP_ZONE_GET(sctppcbinfo.ipi_zone_hash);
        if (inp->sctp_tcbhash == NULL) {
                printf("Out of SCTP-INPCB->hashinit - no resources\n");
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
                SCTP_INP_INFO_WUNLOCK();
                return (ENOBUFS);
        } else {
                for (i = 0; i < sctp_pcbtblsize; i++)
                        LIST_INIT(&inp->sctp_tcbhash[i]);
                for (i = 1; i < sctp_pcbtblsize; i <<= 1)
                        continue;
                inp->sctp_hashmark = i - 1;
        }
        /* LOCK init's */
        SCTP_INP_LOCK_INIT(inp);
        SCTP_ASOC_CREATE_LOCK_INIT(inp);
        /* lock the new ep */
        SCTP_INP_WLOCK(inp);

        /* add it to the info area */
        LIST_INSERT_HEAD(&sctppcbinfo.listhead, inp, sctp_list);
        SCTP_INP_INFO_WUNLOCK();

        LIST_INIT(&inp->sctp_addr_list);
        LIST_INIT(&inp->sctp_asoc_list);
        TAILQ_INIT(&inp->sctp_queue_list);
        /* Init the timer structure for signature change */
        callout_init(&inp->sctp_ep.signature_change.timer, 0);
        inp->sctp_ep.signature_change.type = SCTP_TIMER_TYPE_NEWCOOKIE;

        /* now init the actual endpoint default data */
        m = &inp->sctp_ep;

        /* setup the base timeout information */
        m->sctp_timeoutticks[SCTP_TIMER_SEND] = SEC_TO_TICKS(SCTP_SEND_SEC); /* needed ? */
        m->sctp_timeoutticks[SCTP_TIMER_INIT] = SEC_TO_TICKS(SCTP_INIT_SEC); /* needed ? */
        m->sctp_timeoutticks[SCTP_TIMER_RECV] = MSEC_TO_TICKS(sctp_delayed_sack_time_default);
        m->sctp_timeoutticks[SCTP_TIMER_HEARTBEAT] = sctp_heartbeat_interval_default; /* this is in MSEC */
        m->sctp_timeoutticks[SCTP_TIMER_PMTU] = SEC_TO_TICKS(sctp_pmtu_raise_time_default);
        m->sctp_timeoutticks[SCTP_TIMER_MAXSHUTDOWN] = SEC_TO_TICKS(sctp_shutdown_guard_time_default);
        m->sctp_timeoutticks[SCTP_TIMER_SIGNATURE] = SEC_TO_TICKS(sctp_secret_lifetime_default);
        /* all max/min max are in ms */
        m->sctp_maxrto = sctp_rto_max_default;
        m->sctp_minrto = sctp_rto_min_default;
        m->initial_rto = sctp_rto_initial_default;
        m->initial_init_rto_max = sctp_init_rto_max_default;

        m->max_open_streams_intome = MAX_SCTP_STREAMS;

        m->max_init_times = sctp_init_rtx_max_default;
        m->max_send_times = sctp_assoc_rtx_max_default;
        m->def_net_failure = sctp_path_rtx_max_default;
        m->sctp_sws_sender = SCTP_SWS_SENDER_DEF;
        m->sctp_sws_receiver = SCTP_SWS_RECEIVER_DEF;
        m->max_burst = sctp_max_burst_default;
        /* number of streams to pre-open on a association */
        m->pre_open_stream_count = sctp_nr_outgoing_streams_default;

        /* Add adaption cookie */
        m->adaption_layer_indicator = 0x504C5253;

        /* Minimum cookie size */
        m->size_of_a_cookie = (sizeof(struct sctp_init_msg) * 2) +
                sizeof(struct sctp_state_cookie);
        m->size_of_a_cookie += SCTP_SIGNATURE_SIZE;

        /* Setup the initial secret */
        SCTP_GETTIME_TIMEVAL(&time);
        m->time_of_secret_change = time.tv_sec;

        for (i = 0; i < SCTP_NUMBER_OF_SECRETS; i++) {
                m->secret_key[0][i] = sctp_select_initial_TSN(m);
        }
        sctp_timer_start(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL);

        /* How long is a cookie good for ? */
        m->def_cookie_life = sctp_valid_cookie_life_default;
        SCTP_INP_WUNLOCK(inp);
        return (error);
}


void
sctp_move_pcb_and_assoc(struct sctp_inpcb *old_inp, struct sctp_inpcb *new_inp,
    struct sctp_tcb *stcb)
{
        uint16_t lport, rport;
        struct sctppcbhead *head;
        struct sctp_laddr *laddr, *oladdr;

        SCTP_TCB_UNLOCK(stcb);
        SCTP_INP_INFO_WLOCK();
        SCTP_INP_WLOCK(old_inp);
        SCTP_INP_WLOCK(new_inp);
        SCTP_TCB_LOCK(stcb);

        new_inp->sctp_ep.time_of_secret_change =
            old_inp->sctp_ep.time_of_secret_change;
        memcpy(new_inp->sctp_ep.secret_key, old_inp->sctp_ep.secret_key,
            sizeof(old_inp->sctp_ep.secret_key));
        new_inp->sctp_ep.current_secret_number =
            old_inp->sctp_ep.current_secret_number;
        new_inp->sctp_ep.last_secret_number =
            old_inp->sctp_ep.last_secret_number;
        new_inp->sctp_ep.size_of_a_cookie = old_inp->sctp_ep.size_of_a_cookie;

        /* Copy the port across */
        lport = new_inp->sctp_lport = old_inp->sctp_lport;
        rport = stcb->rport;
        /* Pull the tcb from the old association */
        LIST_REMOVE(stcb, sctp_tcbhash);
        LIST_REMOVE(stcb, sctp_tcblist);

        /* Now insert the new_inp into the TCP connected hash */
        head = &sctppcbinfo.sctp_tcpephash[SCTP_PCBHASH_ALLADDR((lport + rport),
            sctppcbinfo.hashtcpmark)];

        LIST_INSERT_HEAD(head, new_inp, sctp_hash);

        /* Now move the tcb into the endpoint list */
        LIST_INSERT_HEAD(&new_inp->sctp_asoc_list, stcb, sctp_tcblist);
        /*
         * Question, do we even need to worry about the ep-hash since
         * we only have one connection? Probably not :> so lets
         * get rid of it and not suck up any kernel memory in that.
         */
        SCTP_INP_INFO_WUNLOCK();
        stcb->sctp_socket = new_inp->sctp_socket;
        stcb->sctp_ep = new_inp;
        if (new_inp->sctp_tcbhash != NULL) {
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_hash,
                              new_inp->sctp_tcbhash);
                new_inp->sctp_tcbhash = NULL;
        }
        if ((new_inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                /* Subset bound, so copy in the laddr list from the old_inp */
                LIST_FOREACH(oladdr, &old_inp->sctp_addr_list, sctp_nxt_addr) {
                        laddr = (struct sctp_laddr *)SCTP_ZONE_GET(
                            sctppcbinfo.ipi_zone_laddr);
                        if (laddr == NULL) {
                                /*
                                 * Gak, what can we do? This assoc is really
                                 * HOSED. We probably should send an abort
                                 * here.
                                 */
#ifdef SCTP_DEBUG
                                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                        printf("Association hosed in TCP model, out of laddr memory\n");
                                }
#endif /* SCTP_DEBUG */
                                continue;
                        }
                        sctppcbinfo.ipi_count_laddr++;
                        sctppcbinfo.ipi_gencnt_laddr++;
                        memset(laddr, 0, sizeof(*laddr));
                        laddr->ifa = oladdr->ifa;
                        LIST_INSERT_HEAD(&new_inp->sctp_addr_list, laddr,
                            sctp_nxt_addr);
                        new_inp->laddr_count++;
                }
        }
        SCTP_INP_WUNLOCK(new_inp);
        SCTP_INP_WUNLOCK(old_inp);
}

static int
sctp_isport_inuse(struct sctp_inpcb *inp, uint16_t lport)
{
        struct sctppcbhead *head;
        struct sctp_inpcb *t_inp;

        head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
            sctppcbinfo.hashmark)];
        LIST_FOREACH(t_inp, head, sctp_hash) {
                if (t_inp->sctp_lport != lport) {
                        continue;
                }
                /* This one is in use. */
                /* check the v6/v4 binding issue */
                if ((t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                    (((struct in6pcb *)t_inp)->in6p_flags & IN6P_IPV6_V6ONLY)) {
                        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                                /* collision in V6 space */
                                return (1);
                        } else {
                                /* inp is BOUND_V4 no conflict */
                                continue;
                        }
                } else if (t_inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
                        /* t_inp is bound v4 and v6, conflict always */
                        return (1);
                } else {
                        /* t_inp is bound only V4 */
                        if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                            (((struct in6pcb *)inp)->in6p_flags & IN6P_IPV6_V6ONLY)
                                ) {
                                /* no conflict */
                                continue;
                        }
                        /* else fall through to conflict */
                }
                return (1);
        }
        return (0);
}

int
sctp_inpcb_bind(struct socket *so, struct sockaddr *addr, struct lwp *l)
{
        /* bind a ep to a socket address */
        struct sctppcbhead *head;
        struct sctp_inpcb *inp, *inp_tmp;
        int bindall;
        uint16_t lport;
        int error;

        lport = 0;
        error = 0;
        bindall = 1;
        inp = (struct sctp_inpcb *)so->so_pcb;
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                if (addr) {
                        printf("Bind called port:%d\n",
                               ntohs(((struct sockaddr_in *)addr)->sin_port));
                        printf("Addr :");
                        sctp_print_address(addr);
                }
        }
#endif /* SCTP_DEBUG */
        if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) == 0) {
                /* already did a bind, subsequent binds NOT allowed ! */
                return (EINVAL);
        }

        if (addr != NULL) {
                if (addr->sa_family == AF_INET) {
                        struct sockaddr_in *sin;

                        /* IPV6_V6ONLY socket? */
                        if (((struct in6pcb *)inp)->in6p_flags & IN6P_IPV6_V6ONLY) {
                                return (EINVAL);
                        }

                        if (addr->sa_len != sizeof(*sin))
                                return (EINVAL);

                        sin = (struct sockaddr_in *)addr;
                        lport = sin->sin_port;

                        if (sin->sin_addr.s_addr != INADDR_ANY) {
                                bindall = 0;
                        }
#ifdef IPSEC
                        inp->ip_inp.inp.inp_af = AF_INET;
#endif
                } else if (addr->sa_family == AF_INET6) {
                        /* Only for pure IPv6 Address. (No IPv4 Mapped!) */
                        struct sockaddr_in6 *sin6;

                        sin6 = (struct sockaddr_in6 *)addr;

                        if (addr->sa_len != sizeof(*sin6))
                                return (EINVAL);

                        lport = sin6->sin6_port;
                        if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                bindall = 0;
                                /* KAME hack: embed scopeid */
                                error = sa6_embedscope(sin6, ip6_use_defzone);
                                if (error != 0)
                                        return (error);
                        }
#ifndef SCOPEDROUTING
                        /* this must be cleared for ifa_ifwithaddr() */
                        sin6->sin6_scope_id = 0;
#endif /* SCOPEDROUTING */
#ifdef IPSEC
                        inp->ip_inp.inp.inp_af = AF_INET6;
#endif
                } else {
                        return (EAFNOSUPPORT);
                }
#ifdef IPSEC
                if (ipsec_enabled) {
                        inp->ip_inp.inp.inp_socket = so;
                        error = ipsec_init_pcbpolicy(so, &inp->ip_inp.inp.inp_sp);
                        if (error != 0)
                                return (error);
                        inp->ip_inp.inp.inp_sp->sp_inph = (struct inpcb_hdr *)inp;
                }
#endif
        }
        SCTP_INP_INFO_WLOCK();
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("sctp_inpcb_bind: after SCTP_INP_INFO_WLOCK\n");
        }
#endif /* SCTP_DEBUG */
        SCTP_INP_WLOCK(inp);
        /* increase our count due to the unlock we do */
        SCTP_INP_INCR_REF(inp);
        if (lport) {
                enum kauth_network_req req;
                /*
                 * Did the caller specify a port? if so we must see if a
                 * ep already has this one bound.
                 */
                if (ntohs(lport) < IPPORT_RESERVED)
                        req = KAUTH_REQ_NETWORK_BIND_PRIVPORT;
                else
                        req = KAUTH_REQ_NETWORK_BIND_PORT;

                error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_BIND,
                    req, so, addr, NULL);
                if (error) {
                        SCTP_INP_DECR_REF(inp);
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        return (EACCES);
                }
                SCTP_INP_WUNLOCK(inp);
                inp_tmp = sctp_pcb_findep(addr, 0, 1);
                if (inp_tmp != NULL) {
                        /* lock guy returned and lower count
                         * note that we are not bound so inp_tmp
                         * should NEVER be inp. And it is this
                         * inp (inp_tmp) that gets the reference
                         * bump, so we must lower it.
                         */
                        SCTP_INP_WLOCK(inp_tmp);
                        SCTP_INP_DECR_REF(inp_tmp);
                        SCTP_INP_WUNLOCK(inp_tmp);

                        /* unlock info */
                        SCTP_INP_INFO_WUNLOCK();
                        return EADDRINUSE;
                }
                SCTP_INP_WLOCK(inp);
                if (bindall) {
                        /* verify that no lport is not used by a singleton */
                        if (sctp_isport_inuse(inp, lport)) {
                                /* Sorry someone already has this one bound */
                                SCTP_INP_DECR_REF(inp);
                                SCTP_INP_WUNLOCK(inp);
                                SCTP_INP_INFO_WUNLOCK();
                                return EADDRINUSE;
                        }
                }
        } else {
                /*
                 * get any port but lets make sure no one has any address
                 * with this port bound
                 */

                /*
                 * setup the inp to the top (I could use the union but this
                 * is just as easy
                 */
                uint32_t port_guess;
                uint16_t port_attempt;
                int not_done=1;

                while (not_done) {
                        port_guess = sctp_select_initial_TSN(&inp->sctp_ep);
                        port_attempt = (port_guess &  0x0000ffff);
                        if (port_attempt == 0) {
                                goto next_half;
                        }
                        if (port_attempt < IPPORT_RESERVED) {
                                port_attempt += IPPORT_RESERVED;
                        }

                        if (sctp_isport_inuse(inp, htons(port_attempt)) == 0) {
                                /* got a port we can use */
                                not_done = 0;
                                continue;
                        }
                        /* try upper half */
                next_half:
                        port_attempt = ((port_guess >> 16) &  0x0000ffff);
                        if (port_attempt == 0) {
                                goto last_try;
                        }
                        if (port_attempt < IPPORT_RESERVED) {
                                port_attempt += IPPORT_RESERVED;
                        }
                        if (sctp_isport_inuse(inp, htons(port_attempt)) == 0) {
                                /* got a port we can use */
                                not_done = 0;
                                continue;
                        }
                        /* try two half's added together */
                last_try:
                        port_attempt = (((port_guess >> 16) &  0x0000ffff) + (port_guess & 0x0000ffff));
                        if (port_attempt == 0) {
                                /* get a new random number */
                                continue;
                        }
                        if (port_attempt < IPPORT_RESERVED) {
                                port_attempt += IPPORT_RESERVED;
                        }
                        if (sctp_isport_inuse(inp, htons(port_attempt)) == 0) {
                                /* got a port we can use */
                                not_done = 0;
                                continue;
                        }
                }
                /* we don't get out of the loop until we have a port */
                lport = htons(port_attempt);
        }
        SCTP_INP_DECR_REF(inp);
        if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                /* this really should not happen. The guy
                 * did a non-blocking bind and then did a close
                 * at the same time.
                 */
                SCTP_INP_WUNLOCK(inp);
                SCTP_INP_INFO_WUNLOCK();
                return (EINVAL);
        }
        /* ok we look clear to give out this port, so lets setup the binding */
        if (bindall) {
                /* binding to all addresses, so just set in the proper flags */
                inp->sctp_flags |= (SCTP_PCB_FLAGS_BOUNDALL |
                    SCTP_PCB_FLAGS_DO_ASCONF);
                /* set the automatic addr changes from kernel flag */
                if (sctp_auto_asconf == 0) {
                        inp->sctp_flags &= ~SCTP_PCB_FLAGS_AUTO_ASCONF;
                } else {
                        inp->sctp_flags |= SCTP_PCB_FLAGS_AUTO_ASCONF;
                }
        } else {
                /*
                 * bind specific, make sure flags is off and add a new address
                 * structure to the sctp_addr_list inside the ep structure.
                 *
                 * We will need to allocate one and insert it at the head.
                 * The socketopt call can just insert new addresses in there
                 * as well. It will also have to do the embed scope kame hack
                 * too (before adding).
                 */
                struct ifaddr *ifa;
                struct sockaddr_storage store_sa;

                memset(&store_sa, 0, sizeof(store_sa));
                if (addr->sa_family == AF_INET) {
                        struct sockaddr_in *sin;

                        sin = (struct sockaddr_in *)&store_sa;
                        memcpy(sin, addr, sizeof(struct sockaddr_in));
                        sin->sin_port = 0;
                } else if (addr->sa_family == AF_INET6) {
                        struct sockaddr_in6 *sin6;

                        sin6 = (struct sockaddr_in6 *)&store_sa;
                        memcpy(sin6, addr, sizeof(struct sockaddr_in6));
                        sin6->sin6_port = 0;
                }
                /*
                 * first find the interface with the bound address
                 * need to zero out the port to find the address! yuck!
                 * can't do this earlier since need port for sctp_pcb_findep()
                 */
                ifa = sctp_find_ifa_by_addr((struct sockaddr *)&store_sa);
                if (ifa == NULL) {
                        /* Can't find an interface with that address */
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        return (EADDRNOTAVAIL);
                }
                if (addr->sa_family == AF_INET6) {
                        struct in6_ifaddr *ifa6;
                        ifa6 = (struct in6_ifaddr *)ifa;
                        /*
                         * allow binding of deprecated addresses as per
                         * RFC 2462 and ipng discussion
                         */
                        if (ifa6->ia6_flags & (IN6_IFF_DETACHED |
                            IN6_IFF_ANYCAST |
                            IN6_IFF_NOTREADY)) {
                                /* Can't bind a non-existent addr. */
                                SCTP_INP_WUNLOCK(inp);
                                SCTP_INP_INFO_WUNLOCK();
                                return (EINVAL);
                        }
                }
                /* we're not bound all */
                inp->sctp_flags &= ~SCTP_PCB_FLAGS_BOUNDALL;
#if 0 /* use sysctl now */
                /* don't allow automatic addr changes from kernel */
                inp->sctp_flags &= ~SCTP_PCB_FLAGS_AUTO_ASCONF;
#endif
                /* set the automatic addr changes from kernel flag */
                if (sctp_auto_asconf == 0) {
                        inp->sctp_flags &= ~SCTP_PCB_FLAGS_AUTO_ASCONF;
                } else {
                        inp->sctp_flags |= SCTP_PCB_FLAGS_AUTO_ASCONF;
                }
                /* allow bindx() to send ASCONF's for binding changes */
                inp->sctp_flags |= SCTP_PCB_FLAGS_DO_ASCONF;
                /* add this address to the endpoint list */
                error = sctp_insert_laddr(&inp->sctp_addr_list, ifa);
                if (error != 0) {
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_INP_INFO_WUNLOCK();
                        return (error);
                }
                inp->laddr_count++;
        }
        /* find the bucket */
        head = &sctppcbinfo.sctp_ephash[SCTP_PCBHASH_ALLADDR(lport,
            sctppcbinfo.hashmark)];
        /* put it in the bucket */
        LIST_INSERT_HEAD(head, inp, sctp_hash);
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Main hash to bind at head:%p, bound port:%d\n", head, ntohs(lport));
        }
#endif
        /* set in the port */
        inp->sctp_lport = lport;

        /* turn off just the unbound flag */
        inp->sctp_flags &= ~SCTP_PCB_FLAGS_UNBOUND;
        SCTP_INP_WUNLOCK(inp);
        SCTP_INP_INFO_WUNLOCK();
        return (0);
}


static void
sctp_iterator_inp_being_freed(struct sctp_inpcb *inp, struct sctp_inpcb *inp_next)
{
        struct sctp_iterator *it;
        /* We enter with the only the ITERATOR_LOCK in place and
         * A write lock on the inp_info stuff.
         */

        /* Go through all iterators, we must do this since
         * it is possible that some iterator does NOT have
         * the lock, but is waiting for it. And the one that
         * had the lock has either moved in the last iteration
         * or we just cleared it above. We need to find all
         * of those guys. The list of iterators should never
         * be very big though.
         */
        LIST_FOREACH(it, &sctppcbinfo.iteratorhead, sctp_nxt_itr) {
                if (it == inp->inp_starting_point_for_iterator)
                        /* skip this guy, he's special */
                        continue;
                if (it->inp == inp) {
                        /* This is tricky and we DON'T lock the iterator.
                         * Reason is he's running but waiting for me since
                         * inp->inp_starting_point_for_iterator has the lock
                         * on me (the guy above we skipped). This tells us
                         * its is not running but waiting for inp->inp_starting_point_for_iterator
                         * to be released by the guy that does have our INP in a lock.
                         */
                        if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                                it->inp = NULL;
                                it->stcb = NULL;
                        } else {
                                /* set him up to do the next guy not me */
                                it->inp = inp_next;
                                it->stcb = NULL;
                        }
                }
        }
        it = inp->inp_starting_point_for_iterator;
        if (it) {
                if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                        it->inp = NULL;
                } else {
                        it->inp = inp_next;
                }
                it->stcb = NULL;
        }
}

/* release sctp_inpcb unbind the port */
void
sctp_inpcb_free(struct sctp_inpcb *inp, int immediate)
{
        /*
         * Here we free a endpoint. We must find it (if it is in the Hash
         * table) and remove it from there. Then we must also find it in
         * the overall list and remove it from there. After all removals are
         * complete then any timer has to be stopped. Then start the actual
         * freeing.
         * a) Any local lists.
         * b) Any associations.
         * c) The hash of all associations.
         * d) finally the ep itself.
         */
        struct sctp_inpcb *inp_save;
        struct sctp_tcb *asoc, *nasoc;
        struct sctp_laddr *laddr, *nladdr;
        struct inpcb *ip_pcb;
        struct socket *so;
        struct sctp_socket_q_list *sq;
        int s, cnt;
        struct rtentry *rt;

        s = splsoftnet();
        SCTP_ASOC_CREATE_LOCK(inp);
        SCTP_INP_WLOCK(inp);

        if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) {
                /* been here before */
                splx(s);
                printf("Endpoint was all gone (dup free)?\n");
                SCTP_INP_WUNLOCK(inp);
                SCTP_ASOC_CREATE_UNLOCK(inp);
                return;
        }
        sctp_timer_stop(SCTP_TIMER_TYPE_NEWCOOKIE, inp, NULL, NULL);

        sctp_m_freem(inp->control);
        inp->control = NULL;
        sctp_m_freem(inp->pkt);
        inp->pkt = NULL;
        so = inp->sctp_socket;
        ip_pcb = &inp->ip_inp.inp; /* we could just cast the main
                                   * pointer here but I will
                                   * be nice :> (i.e. ip_pcb = ep;)
                                   */

        if (immediate == 0) {
                int cnt_in_sd;
                cnt_in_sd = 0;
                for ((asoc = LIST_FIRST(&inp->sctp_asoc_list)); asoc != NULL;
                     asoc = nasoc) {
                        nasoc = LIST_NEXT(asoc, sctp_tcblist);
                        if ((SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_COOKIE_WAIT) ||
                            (SCTP_GET_STATE(&asoc->asoc) == SCTP_STATE_COOKIE_ECHOED)) {
                                /* Just abandon things in the front states */
                                SCTP_TCB_LOCK(asoc);
                                SCTP_INP_WUNLOCK(inp);
                                sctp_free_assoc(inp, asoc);
                                SCTP_INP_WLOCK(inp);
                                continue;
                        } else {
                                asoc->asoc.state |= SCTP_STATE_CLOSED_SOCKET;
                        }
                        if ((asoc->asoc.size_on_delivery_queue  > 0) ||
                            (asoc->asoc.size_on_reasm_queue > 0) ||
                            (asoc->asoc.size_on_all_streams > 0) ||
                            (so && (so->so_rcv.sb_cc > 0))
                                ) {
                                /* Left with Data unread */
                                struct mbuf *op_err;
                                MGET(op_err, M_DONTWAIT, MT_DATA);
                                if (op_err) {
                                        /* Fill in the user initiated abort */
                                        struct sctp_paramhdr *ph;
                                        op_err->m_len =
                                            sizeof(struct sctp_paramhdr);
                                        ph = mtod(op_err,
                                            struct sctp_paramhdr *);
                                        ph->param_type = htons(
                                            SCTP_CAUSE_USER_INITIATED_ABT);
                                        ph->param_length = htons(op_err->m_len);
                                }
                                SCTP_TCB_LOCK(asoc);
                                sctp_send_abort_tcb(asoc, op_err);

                                SCTP_INP_WUNLOCK(inp);
                                sctp_free_assoc(inp, asoc);
                                SCTP_INP_WLOCK(inp);
                                continue;
                        } else if (TAILQ_EMPTY(&asoc->asoc.send_queue) &&
                            TAILQ_EMPTY(&asoc->asoc.sent_queue)) {
                                if ((SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_SHUTDOWN_SENT) &&
                                    (SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_SHUTDOWN_ACK_SENT)) {
                                        /* there is nothing queued to send, so I send shutdown */
                                        SCTP_TCB_LOCK(asoc);
                                        sctp_send_shutdown(asoc, asoc->asoc.primary_destination);
                                        asoc->asoc.state = SCTP_STATE_SHUTDOWN_SENT;
                                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, asoc->sctp_ep, asoc,
                                                         asoc->asoc.primary_destination);
                                        sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, asoc->sctp_ep, asoc,
                                                         asoc->asoc.primary_destination);
                                        sctp_chunk_output(inp, asoc, 1);
                                        SCTP_TCB_UNLOCK(asoc);
                                }
                        } else {
                                /* mark into shutdown pending */
                                asoc->asoc.state |= SCTP_STATE_SHUTDOWN_PENDING;
                        }
                        cnt_in_sd++;
                }
                /* now is there some left in our SHUTDOWN state? */
                if (cnt_in_sd) {
                        inp->sctp_flags |= SCTP_PCB_FLAGS_SOCKET_GONE;
                        splx(s);
                        SCTP_INP_WUNLOCK(inp);
                        SCTP_ASOC_CREATE_UNLOCK(inp);
                        return;
                }
        }
#if defined(__FreeBSD__) && __FreeBSD_version >= 503000
        if (inp->refcount) {
                sctp_timer_start(SCTP_TIMER_TYPE_INPKILL, inp, NULL, NULL);
                SCTP_INP_WUNLOCK(inp);
                SCTP_ASOC_CREATE_UNLOCK(inp);
                return;
        }
#endif
        inp->sctp_flags |= SCTP_PCB_FLAGS_SOCKET_ALLGONE;

        /* XXX */
        rt = rtcache_validate(&ip_pcb->inp_route);
        rtcache_unref(rt, &ip_pcb->inp_route);

        callout_stop(&inp->sctp_ep.signature_change.timer);
        callout_destroy(&inp->sctp_ep.signature_change.timer);

        if (so) {
        /* First take care of socket level things */
#ifdef IPSEC
                if (ipsec_enabled)
                        ipsec_delete_pcbpolicy(ip_pcb);
#endif /*IPSEC*/
                so->so_pcb = 0;
        }

        if (ip_pcb->inp_options) {
                (void)m_free(ip_pcb->inp_options);
                ip_pcb->inp_options = 0;
        }
        rtcache_free(&ip_pcb->inp_route);
        if (ip_pcb->inp_moptions) {
                ip_freemoptions(ip_pcb->inp_moptions);
                ip_pcb->inp_moptions = 0;
        }
        inp->inp_vflag = 0;

        /* Now the sctp_pcb things */
        /*
         * free each asoc if it is not already closed/free. we can't use
         * the macro here since le_next will get freed as part of the
         * sctp_free_assoc() call.
         */
        cnt = 0;
        for ((asoc = LIST_FIRST(&inp->sctp_asoc_list)); asoc != NULL;
             asoc = nasoc) {
                nasoc = LIST_NEXT(asoc, sctp_tcblist);
                SCTP_TCB_LOCK(asoc);
                if (SCTP_GET_STATE(&asoc->asoc) != SCTP_STATE_COOKIE_WAIT) {
                        struct mbuf *op_err;
                        MGET(op_err, M_DONTWAIT, MT_DATA);
                        if (op_err) {
                                /* Fill in the user initiated abort */
                                struct sctp_paramhdr *ph;
                                op_err->m_len = sizeof(struct sctp_paramhdr);
                                ph = mtod(op_err, struct sctp_paramhdr *);
                                ph->param_type = htons(
                                    SCTP_CAUSE_USER_INITIATED_ABT);
                                ph->param_length = htons(op_err->m_len);
                        }
                        sctp_send_abort_tcb(asoc, op_err);
                }
                cnt++;
                /*
                 * sctp_free_assoc() will call sctp_inpcb_free(),
                 * if SCTP_PCB_FLAGS_SOCKET_GONE set.
                 * So, we clear it before sctp_free_assoc() making sure
                 * no double sctp_inpcb_free().
                 */
                inp->sctp_flags &= ~SCTP_PCB_FLAGS_SOCKET_GONE;
                SCTP_INP_WUNLOCK(inp);
                sctp_free_assoc(inp, asoc);
                SCTP_INP_WLOCK(inp);
        }
        while ((sq = TAILQ_FIRST(&inp->sctp_queue_list)) != NULL) {
                TAILQ_REMOVE(&inp->sctp_queue_list, sq, next_sq);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_sockq, sq);
                sctppcbinfo.ipi_count_sockq--;
                sctppcbinfo.ipi_gencnt_sockq++;
        }
        inp->sctp_socket = 0;
        /* Now first we remove ourselves from the overall list of all EP's */

        /* Unlock inp first, need correct order */
        SCTP_INP_WUNLOCK(inp);
        /* now iterator lock */
        SCTP_ITERATOR_LOCK();
        /* now info lock */
        SCTP_INP_INFO_WLOCK();
        /* now reget the inp lock */
        SCTP_INP_WLOCK(inp);

        inp_save = LIST_NEXT(inp, sctp_list);
        LIST_REMOVE(inp, sctp_list);
        /*
         * Now the question comes as to if this EP was ever bound at all.
         * If it was, then we must pull it out of the EP hash list.
         */
        if ((inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) !=
            SCTP_PCB_FLAGS_UNBOUND) {
                /*
                 * ok, this guy has been bound. It's port is somewhere
                 * in the sctppcbinfo hash table. Remove it!
                 */
                LIST_REMOVE(inp, sctp_hash);
        }
        /* fix any iterators only after out of the list */
        sctp_iterator_inp_being_freed(inp, inp_save);
        SCTP_ITERATOR_UNLOCK();
        /*
         * if we have an address list the following will free the list of
         * ifaddr's that are set into this ep. Again macro limitations here,
         * since the LIST_FOREACH could be a bad idea.
         */
        for ((laddr = LIST_FIRST(&inp->sctp_addr_list)); laddr != NULL;
             laddr = nladdr) {
                nladdr = LIST_NEXT(laddr, sctp_nxt_addr);
                LIST_REMOVE(laddr, sctp_nxt_addr);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, laddr);
                sctppcbinfo.ipi_gencnt_laddr++;
                sctppcbinfo.ipi_count_laddr--;
        }

        /* Now lets see about freeing the EP hash table. */
        if (inp->sctp_tcbhash != NULL) {
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_hash, inp->sctp_tcbhash);
                inp->sctp_tcbhash = NULL;
        }
        SCTP_INP_WUNLOCK(inp);
        SCTP_ASOC_CREATE_UNLOCK(inp);
        SCTP_INP_LOCK_DESTROY(inp);
        SCTP_ASOC_CREATE_LOCK_DESTROY(inp);

        /* Now we must put the ep memory back into the zone pool */
        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_ep, inp);
        sctppcbinfo.ipi_count_ep--;

        SCTP_INP_INFO_WUNLOCK();
        splx(s);

        sofree(so);
        mutex_enter(softnet_lock);
}


struct sctp_nets *
sctp_findnet(struct sctp_tcb *stcb, struct sockaddr *addr)
{
        struct sctp_nets *net;

        /* use the peer's/remote port for lookup if unspecified */
#if 0 /* why do we need to check the port for a nets list on an assoc? */
        if (stcb->rport != sin->sin_port) {
                /* we cheat and just a sin for this test */
                return (NULL);
        }
#endif
        /* locate the address */
        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                if (sctp_cmpaddr(addr, rtcache_getdst(&net->ro)))
                        return (net);
        }
        return (NULL);
}


/*
 * add's a remote endpoint address, done with the INIT/INIT-ACK
 * as well as when a ASCONF arrives that adds it. It will also
 * initialize all the cwnd stats of stuff.
 */
int
sctp_is_address_on_local_host(struct sockaddr *addr)
{
        struct ifnet *ifn;
        struct ifaddr *ifa;
        int s;

        s = pserialize_read_enter();
        IFNET_READER_FOREACH(ifn) {
                IFADDR_READER_FOREACH(ifa, ifn) {
                        if (addr->sa_family == ifa->ifa_addr->sa_family) {
                                /* same family */
                                if (addr->sa_family == AF_INET) {
                                        struct sockaddr_in *sin, *sin_c;
                                        sin = (struct sockaddr_in *)addr;
                                        sin_c = (struct sockaddr_in *)
                                            ifa->ifa_addr;
                                        if (sin->sin_addr.s_addr ==
                                            sin_c->sin_addr.s_addr) {
                                                /* we are on the same machine */
                                                pserialize_read_exit(s);
                                                return (1);
                                        }
                                } else if (addr->sa_family == AF_INET6) {
                                        struct sockaddr_in6 *sin6, *sin_c6;
                                        sin6 = (struct sockaddr_in6 *)addr;
                                        sin_c6 = (struct sockaddr_in6 *)
                                            ifa->ifa_addr;
                                        if (SCTP6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
                                            &sin_c6->sin6_addr)) {
                                                /* we are on the same machine */
                                                pserialize_read_exit(s);
                                                return (1);
                                        }
                                }
                        }
                }
        }
        pserialize_read_exit(s);

        return (0);
}

int
sctp_add_remote_addr(struct sctp_tcb *stcb, struct sockaddr *newaddr,
    int set_scope, int from)
{
        /*
         * The following is redundant to the same lines in the
         * sctp_aloc_assoc() but is needed since other's call the add
         * address function
         */
        struct sctp_nets *net, *netfirst;
        struct rtentry *rt, *netfirst_rt;
        int addr_inscope;

#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Adding an address (from:%d) to the peer: ", from);
                sctp_print_address(newaddr);
        }
#endif
        netfirst = sctp_findnet(stcb, newaddr);
        if (netfirst) {
                /*
                 * Lie and return ok, we don't want to make the association
                 * go away for this behavior. It will happen in the TCP model
                 * in a connected socket. It does not reach the hash table
                 * until after the association is built so it can't be found.
                 * Mark as reachable, since the initial creation will have
                 * been cleared and the NOT_IN_ASSOC flag will have been
                 * added... and we don't want to end up removing it back out.
                 */
                if (netfirst->dest_state & SCTP_ADDR_UNCONFIRMED) {
                        netfirst->dest_state = (SCTP_ADDR_REACHABLE|
                            SCTP_ADDR_UNCONFIRMED);
                } else {
                        netfirst->dest_state = SCTP_ADDR_REACHABLE;
                }

                return (0);
        }
        addr_inscope = 1;
        if (newaddr->sa_family == AF_INET) {
                struct sockaddr_in *sin;
                sin = (struct sockaddr_in *)newaddr;
                if (sin->sin_addr.s_addr == 0) {
                        /* Invalid address */
                        return (-1);
                }
                /* zero out the bzero area */
                memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));

                /* assure len is set */
                sin->sin_len = sizeof(struct sockaddr_in);
                if (set_scope) {
#ifdef SCTP_DONT_DO_PRIVADDR_SCOPE
                        stcb->ipv4_local_scope = 1;
#else
                        if (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                                stcb->asoc.ipv4_local_scope = 1;
                        }
#endif /* SCTP_DONT_DO_PRIVADDR_SCOPE */

                        if (sctp_is_address_on_local_host(newaddr)) {
                                stcb->asoc.loopback_scope = 1;
                                stcb->asoc.ipv4_local_scope = 1;
                                stcb->asoc.local_scope = 1;
                                stcb->asoc.site_scope = 1;
                        }
                } else {
                        if (from == 8) {
                                /* From connectx */
                                if (sctp_is_address_on_local_host(newaddr)) {
                                        stcb->asoc.loopback_scope = 1;
                                        stcb->asoc.ipv4_local_scope = 1;
                                        stcb->asoc.local_scope = 1;
                                        stcb->asoc.site_scope = 1;
                                }
                        }
                        /* Validate the address is in scope */
                        if ((IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) &&
                            (stcb->asoc.ipv4_local_scope == 0)) {
                                addr_inscope = 0;
                        }
                }
        } else if (newaddr->sa_family == AF_INET6) {
                struct sockaddr_in6 *sin6;
                sin6 = (struct sockaddr_in6 *)newaddr;
                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                        /* Invalid address */
                        return (-1);
                }
                /* assure len is set */
                sin6->sin6_len = sizeof(struct sockaddr_in6);
                if (set_scope) {
                        if (sctp_is_address_on_local_host(newaddr)) {
                                stcb->asoc.loopback_scope = 1;
                                stcb->asoc.local_scope = 1;
                                stcb->asoc.ipv4_local_scope = 1;
                                stcb->asoc.site_scope = 1;
                        } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                /*
                                 * If the new destination is a LINK_LOCAL
                                 * we must have common site scope. Don't set
                                 * the local scope since we may not share all
                                 * links, only loopback can do this.
                                 * Links on the local network would also
                                 * be on our private network for v4 too.
                                 */
                                stcb->asoc.ipv4_local_scope = 1;
                                stcb->asoc.site_scope = 1;
                        } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
                                /*
                                 * If the new destination is SITE_LOCAL
                                 * then we must have site scope in common.
                                 */
                                stcb->asoc.site_scope = 1;
                        }
                } else {
                        if (from == 8) {
                                /* From connectx */
                                if (sctp_is_address_on_local_host(newaddr)) {
                                        stcb->asoc.loopback_scope = 1;
                                        stcb->asoc.ipv4_local_scope = 1;
                                        stcb->asoc.local_scope = 1;
                                        stcb->asoc.site_scope = 1;
                                }
                        }
                        /* Validate the address is in scope */
                        if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr) &&
                            (stcb->asoc.loopback_scope == 0)) {
                                addr_inscope = 0;
                        } else if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) &&
                                   (stcb->asoc.local_scope == 0)) {
                                addr_inscope = 0;
                        } else if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) &&
                                   (stcb->asoc.site_scope == 0)) {
                                addr_inscope = 0;
                        }
                }
        } else {
                /* not supported family type */
                return (-1);
        }
        net = (struct sctp_nets *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_net);
        if (net == NULL) {
                return (-1);
        }
        sctppcbinfo.ipi_count_raddr++;
        sctppcbinfo.ipi_gencnt_raddr++;
        memset(net, 0, sizeof(*net));
        if (newaddr->sa_family == AF_INET) {
                ((struct sockaddr_in *)newaddr)->sin_port = stcb->rport;
        } else if (newaddr->sa_family == AF_INET6) {
                ((struct sockaddr_in6 *)newaddr)->sin6_port = stcb->rport;
        }
        net->addr_is_local = sctp_is_address_on_local_host(newaddr);
        net->failure_threshold = stcb->asoc.def_net_failure;
        if (addr_inscope == 0) {
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                        printf("Adding an address which is OUT OF SCOPE\n");
                }
#endif /* SCTP_DEBUG */
                net->dest_state = (SCTP_ADDR_REACHABLE |
                    SCTP_ADDR_OUT_OF_SCOPE);
        } else {
                if (from == 8)
                        /* 8 is passed by connect_x */
                        net->dest_state = SCTP_ADDR_REACHABLE;
                else
                        net->dest_state = SCTP_ADDR_REACHABLE |
                            SCTP_ADDR_UNCONFIRMED;
        }
        net->RTO = stcb->asoc.initial_rto;
        stcb->asoc.numnets++;
        net->ref_count = 1;

        /* Init the timer structure */
        callout_init(&net->rxt_timer.timer, 0);
        callout_init(&net->pmtu_timer.timer, 0);

        /* Now generate a route for this guy */
        /* KAME hack: embed scope zone ID */
        if (newaddr->sa_family == AF_INET6) {
                struct sockaddr_in6 *sin6;
                sin6 = (struct sockaddr_in6 *)newaddr;
                if (sa6_embedscope(sin6, ip6_use_defzone) != 0)
                        return (-1);
        }
        rt = rtcache_lookup(&net->ro, newaddr);
        if (rt) {
                net->mtu = rt->rt_ifp->if_mtu;
                if (from == 1) {
                        stcb->asoc.smallest_mtu = net->mtu;
                }
                /* start things off to match mtu of interface please. */
                rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
        } else {
                net->mtu = stcb->asoc.smallest_mtu;
        }
#ifdef SCTP_DEBUG
        printf("After lookup\n");
#endif
        if (stcb->asoc.smallest_mtu > net->mtu) {
                stcb->asoc.smallest_mtu = net->mtu;
        }
        /* We take the max of the burst limit times a MTU or the INITIAL_CWND.
         * We then limit this to 4 MTU's of sending.
         */
        net->cwnd = uimin((net->mtu * 4), uimax((stcb->asoc.max_burst * net->mtu), SCTP_INITIAL_CWND));

        /* we always get at LEAST 2 MTU's */
        if (net->cwnd < (2 * net->mtu)) {
                net->cwnd = 2 * net->mtu;
        }

        net->ssthresh = stcb->asoc.peers_rwnd;

        net->src_addr_selected = 0;
        netfirst = TAILQ_FIRST(&stcb->asoc.nets);
        if (rt == NULL) {
                /* Since we have no route put it at the back */
                TAILQ_INSERT_TAIL(&stcb->asoc.nets, net, sctp_next);
        } else if (netfirst == NULL) {
                /* We are the first one in the pool. */
                TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
        } else if ((netfirst_rt = rtcache_validate(&netfirst->ro)) == NULL) {
                /*
                 * First one has NO route. Place this one ahead of the
                 * first one.
                 */
                TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
        } else if (rt->rt_ifp != netfirst_rt->rt_ifp) {
                rtcache_unref(netfirst_rt, &netfirst->ro);
                /*
                 * This one has a different interface than the one at the
                 * top of the list. Place it ahead.
                 */
                TAILQ_INSERT_HEAD(&stcb->asoc.nets, net, sctp_next);
        } else {
                /*
                 * Ok we have the same interface as the first one. Move
                 * forward until we find either
                 *   a) one with a NULL route... insert ahead of that
                 *   b) one with a different ifp.. insert after that.
                 *   c) end of the list.. insert at the tail.
                 */
                struct sctp_nets *netlook;
                struct rtentry *netlook_rt;
                do {
                        netlook = TAILQ_NEXT(netfirst, sctp_next);
                        if (netlook == NULL) {
                                /* End of the list */
                                TAILQ_INSERT_TAIL(&stcb->asoc.nets, net,
                                    sctp_next);
                                break;
                        } else if ((netlook_rt = rtcache_validate(&netlook->ro)) == NULL) {
                                /* next one has NO route */
                                TAILQ_INSERT_BEFORE(netfirst, net, sctp_next);
                                break;
                        } else if (netlook_rt->rt_ifp != rt->rt_ifp) {
                                rtcache_unref(netlook_rt, &netlook->ro);
                                TAILQ_INSERT_AFTER(&stcb->asoc.nets, netlook,
                                    net, sctp_next);
                                break;
                        }
                        rtcache_unref(netlook_rt, &netlook->ro);
                        /* Shift forward */
                        netfirst = netlook;
                } while (netlook != NULL);
                rtcache_unref(netfirst_rt, &netfirst->ro);
        }
        /* got to have a primary set */
        if (stcb->asoc.primary_destination == 0) {
                stcb->asoc.primary_destination = net;
        } else if (!rtcache_validate(&stcb->asoc.primary_destination->ro)) {
                /* No route to current primary adopt new primary */
                stcb->asoc.primary_destination = net;
        }
        sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb,
            net);

        return (0);
}


/*
 * allocate an association and add it to the endpoint. The caller must
 * be careful to add all additional addresses once they are know right
 * away or else the assoc will be may experience a blackout scenario.
 */
struct sctp_tcb *
sctp_aloc_assoc(struct sctp_inpcb *inp, struct sockaddr *firstaddr,
    int for_a_init, int *error,  uint32_t override_tag)
{
        struct sctp_tcb *stcb;
        struct sctp_association *asoc;
        struct sctpasochead *head;
        uint16_t rport;
        int err;

        /*
         * Assumption made here:
         *  Caller has done a sctp_findassociation_ep_addr(ep, addr's);
         *  to make sure the address does not exist already.
         */
        if (sctppcbinfo.ipi_count_asoc >= SCTP_MAX_NUM_OF_ASOC) {
                /* Hit max assoc, sorry no more */
                *error = ENOBUFS;
                return (NULL);
        }
        SCTP_INP_RLOCK(inp);
        if (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) {
                /*
                 * If its in the TCP pool, its NOT allowed to create an
                 * association. The parent listener needs to call
                 * sctp_aloc_assoc.. or the one-2-many socket. If a
                 * peeled off, or connected one does this.. its an error.
                 */
                SCTP_INP_RUNLOCK(inp);
                *error = EINVAL;
                return (NULL);
        }

#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                printf("Allocate an association for peer:");
                if (firstaddr)
                        sctp_print_address(firstaddr);
                else
                        printf("None\n");
                printf("Port:%d\n",
                       ntohs(((struct sockaddr_in *)firstaddr)->sin_port));
        }
#endif /* SCTP_DEBUG */
        if (firstaddr->sa_family == AF_INET) {
                struct sockaddr_in *sin;
                sin = (struct sockaddr_in *)firstaddr;
                if ((sin->sin_port == 0) || (sin->sin_addr.s_addr == 0)) {
                        /* Invalid address */
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                                printf("peer address invalid\n");
                        }
#endif
                        SCTP_INP_RUNLOCK(inp);
                        *error = EINVAL;
                        return (NULL);
                }
                rport = sin->sin_port;
        } else if (firstaddr->sa_family == AF_INET6) {
                struct sockaddr_in6 *sin6;
                sin6 = (struct sockaddr_in6 *)firstaddr;
                if ((sin6->sin6_port == 0) ||
                    (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))) {
                        /* Invalid address */
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                                printf("peer address invalid\n");
                        }
#endif
                        SCTP_INP_RUNLOCK(inp);
                        *error = EINVAL;
                        return (NULL);
                }
                rport = sin6->sin6_port;
        } else {
                /* not supported family type */
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("BAD family %d\n", firstaddr->sa_family);
                }
#endif
                SCTP_INP_RUNLOCK(inp);
                *error = EINVAL;
                return (NULL);
        }
        SCTP_INP_RUNLOCK(inp);
        if (inp->sctp_flags & SCTP_PCB_FLAGS_UNBOUND) {
                /*
                 * If you have not performed a bind, then we need to do
                 * the ephemerial bind for you.
                 */
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("Doing implicit BIND\n");
                }
#endif

                if ((err = sctp_inpcb_bind(inp->sctp_socket,
                    (struct sockaddr *)NULL, (struct lwp *)NULL))){
                        /* bind error, probably perm */
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                                printf("BIND FAILS ret:%d\n", err);
                        }
#endif

                        *error = err;
                        return (NULL);
                }
        }
        stcb = (struct sctp_tcb *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_asoc);
        if (stcb == NULL) {
                /* out of memory? */
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("aloc_assoc: no assoc mem left, stcb=NULL\n");
                }
#endif
                *error = ENOMEM;
                return (NULL);
        }
        sctppcbinfo.ipi_count_asoc++;
        sctppcbinfo.ipi_gencnt_asoc++;

        memset(stcb, 0, sizeof(*stcb));
        asoc = &stcb->asoc;
        SCTP_TCB_LOCK_INIT(stcb);
        /* setup back pointers */
#ifdef SCTP_DEBUG
        printf("Before back pointers\n");
#endif
        stcb->sctp_ep = inp;
        stcb->sctp_socket = inp->sctp_socket;
        if ((err = sctp_init_asoc(inp, asoc, for_a_init, override_tag))) {
                /* failed */
                SCTP_TCB_LOCK_DESTROY (stcb);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
                sctppcbinfo.ipi_count_asoc--;
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("aloc_assoc: couldn't init asoc, out of mem?!\n");
                }
#endif
                *error = err;
                return (NULL);
        }
        /* and the port */
        stcb->rport = rport;
        SCTP_INP_INFO_WLOCK();
        SCTP_INP_WLOCK(inp);
        if (inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                /* inpcb freed while alloc going on */
                SCTP_TCB_LOCK_DESTROY (stcb);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
                SCTP_INP_WUNLOCK(inp);
                SCTP_INP_INFO_WUNLOCK();
                sctppcbinfo.ipi_count_asoc--;
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("aloc_assoc: couldn't init asoc, out of mem?!\n");
                }
#endif
                *error = EINVAL;
                return (NULL);
        }
        SCTP_TCB_LOCK(stcb);

        /* now that my_vtag is set, add it to the  hash */
        head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(stcb->asoc.my_vtag,
             sctppcbinfo.hashasocmark)];
        /* put it in the bucket in the vtag hash of assoc's for the system */
        LIST_INSERT_HEAD(head, stcb, sctp_asocs);
        SCTP_INP_INFO_WUNLOCK();


        if ((err = sctp_add_remote_addr(stcb, firstaddr, 1, 1))) {
                /* failure.. memory error? */
                if (asoc->strmout)
                        free(asoc->strmout, M_PCB);
                if (asoc->mapping_array)
                        free(asoc->mapping_array, M_PCB);

                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
                sctppcbinfo.ipi_count_asoc--;
#ifdef SCTP_DEBUG
                if (sctp_debug_on & SCTP_DEBUG_PCB3) {
                        printf("aloc_assoc: couldn't add remote addr!\n");
                }
#endif
                SCTP_TCB_LOCK_DESTROY (stcb);
                *error = ENOBUFS;
                return (NULL);
        }
        /* Init all the timers */
        callout_init(&asoc->hb_timer.timer, 0);
        callout_init(&asoc->dack_timer.timer, 0);
        callout_init(&asoc->asconf_timer.timer, 0);
        callout_init(&asoc->shut_guard_timer.timer, 0);
        callout_init(&asoc->autoclose_timer.timer, 0);
        callout_init(&asoc->delayed_event_timer.timer, 0);
        LIST_INSERT_HEAD(&inp->sctp_asoc_list, stcb, sctp_tcblist);
        /* now file the port under the hash as well */
#ifdef SCTP_DEBUG
        printf("Before hashing %ld size %d\n",
                inp->sctp_hashmark, sctp_pcbtblsize);
#endif
        if (inp->sctp_tcbhash != NULL) {
                head = &inp->sctp_tcbhash[SCTP_PCBHASH_ALLADDR(stcb->rport,
                   inp->sctp_hashmark)];
                LIST_INSERT_HEAD(head, stcb, sctp_tcbhash);
        }
#ifdef SCTP_DEBUG
        printf("After hashing\n");
#endif
        SCTP_INP_WUNLOCK(inp);
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                printf("Association %p now allocated\n", stcb);
        }
#endif
        return (stcb);
}

void
sctp_free_remote_addr(struct sctp_nets *net)
{
        if (net == NULL)
                return;
        net->ref_count--;
        if (net->ref_count <= 0) {
                /* stop timer if running */
                callout_stop(&net->rxt_timer.timer);
                callout_stop(&net->pmtu_timer.timer);
                callout_destroy(&net->rxt_timer.timer);
                callout_destroy(&net->pmtu_timer.timer);
                net->dest_state = SCTP_ADDR_NOT_REACHABLE;
                rtcache_free(&net->ro);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_net, net);
                sctppcbinfo.ipi_count_raddr--;
        }
}

/*
 * remove a remote endpoint address from an association, it
 * will fail if the address does not exist.
 */
int
sctp_del_remote_addr(struct sctp_tcb *stcb, struct sockaddr *remaddr)
{
        /*
         * Here we need to remove a remote address. This is quite simple, we
         * first find it in the list of address for the association
         * (tasoc->asoc.nets) and then if it is there, we do a LIST_REMOVE on
         * that item.
         * Note we do not allow it to be removed if there are no other
         * addresses.
         */
        struct sctp_association *asoc;
        struct sctp_nets *net, *net_tmp;
        asoc = &stcb->asoc;
        if (asoc->numnets < 2) {
                /* Must have at LEAST two remote addresses */
                return (-1);
        }
        /* locate the address */
        for (net = TAILQ_FIRST(&asoc->nets); net != NULL; net = net_tmp) {
                net_tmp = TAILQ_NEXT(net, sctp_next);
                if (rtcache_getdst(&net->ro)->sa_family != remaddr->sa_family) {
                        continue;
                }
                if (sctp_cmpaddr(rtcache_getdst(&net->ro), remaddr)) {
                        /* we found the guy */
                        asoc->numnets--;
                        TAILQ_REMOVE(&asoc->nets, net, sctp_next);
                        sctp_free_remote_addr(net);
                        if (net == asoc->primary_destination) {
                                /* Reset primary */
                                struct sctp_nets *lnet;
                                lnet = TAILQ_FIRST(&asoc->nets);
                                /* Try to find a confirmed primary */
                                asoc->primary_destination =
                                    sctp_find_alternate_net(stcb, lnet);
                        }
                        if (net == asoc->last_data_chunk_from) {
                                /* Reset primary */
                                asoc->last_data_chunk_from =
                                    TAILQ_FIRST(&asoc->nets);
                        }
                        if (net == asoc->last_control_chunk_from) {
                                /* Reset primary */
                                asoc->last_control_chunk_from =
                                    TAILQ_FIRST(&asoc->nets);
                        }
                        if (net == asoc->asconf_last_sent_to) {
                                /* Reset primary */
                                asoc->asconf_last_sent_to =
                                    TAILQ_FIRST(&asoc->nets);
                        }
                        return (0);
                }
        }
        /* not found. */
        return (-2);
}


static void
sctp_add_vtag_to_timewait(struct sctp_inpcb *inp, u_int32_t tag)
{
        struct sctpvtaghead *chain;
        struct sctp_tagblock *twait_block;
        struct timeval now;
        int set, i;
        SCTP_GETTIME_TIMEVAL(&now);
        chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
        set = 0;
        if (!LIST_EMPTY(chain)) {
                /* Block(s) present, lets find space, and expire on the fly */
                LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                        for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                                if ((twait_block->vtag_block[i].v_tag == 0) &&
                                    !set) {
                                        twait_block->vtag_block[0].tv_sec_at_expire =
                                            now.tv_sec + SCTP_TIME_WAIT;
                                        twait_block->vtag_block[0].v_tag = tag;
                                        set = 1;
                                } else if ((twait_block->vtag_block[i].v_tag) &&
                                    ((long)twait_block->vtag_block[i].tv_sec_at_expire >
                                    now.tv_sec)) {
                                        /* Audit expires this guy */
                                        twait_block->vtag_block[i].tv_sec_at_expire = 0;
                                        twait_block->vtag_block[i].v_tag = 0;
                                        if (set == 0) {
                                                /* Reuse it for my new tag */
                                                twait_block->vtag_block[0].tv_sec_at_expire = now.tv_sec + SCTP_TIME_WAIT;
                                                twait_block->vtag_block[0].v_tag = tag;
                                                set = 1;
                                        }
                                }
                        }
                        if (set) {
                                /*
                                 * We only do up to the block where we can
                                 * place our tag for audits
                                 */
                                break;
                        }
                }
        }
        /* Need to add a new block to chain */
        if (!set) {
                twait_block = malloc(sizeof(struct sctp_tagblock), M_PCB, M_NOWAIT);
                if (twait_block == NULL) {
                        return;
                }
                memset(twait_block, 0, sizeof(struct sctp_timewait));
                LIST_INSERT_HEAD(chain, twait_block, sctp_nxt_tagblock);
                twait_block->vtag_block[0].tv_sec_at_expire = now.tv_sec +
                    SCTP_TIME_WAIT;
                twait_block->vtag_block[0].v_tag = tag;
        }
}


static void
sctp_iterator_asoc_being_freed(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
        struct sctp_iterator *it;



        /* Unlock the tcb lock we do this so
         * we avoid a dead lock scenario where
         * the iterator is waiting on the TCB lock
         * and the TCB lock is waiting on the iterator
         * lock.
         */
        SCTP_ITERATOR_LOCK();
        SCTP_INP_INFO_WLOCK();
        SCTP_INP_WLOCK(inp);
        SCTP_TCB_LOCK(stcb);

        it = stcb->asoc.stcb_starting_point_for_iterator;
        if (it == NULL) {
                return;
        }
        if (it->inp != stcb->sctp_ep) {
                /* hm, focused on the wrong one? */
                return;
        }
        if (it->stcb != stcb) {
                return;
        }
        it->stcb = LIST_NEXT(stcb, sctp_tcblist);
        if (it->stcb == NULL) {
                /* done with all asoc's in this assoc */
                if (it->iterator_flags & SCTP_ITERATOR_DO_SINGLE_INP) {
                        it->inp = NULL;
                } else {

                        it->inp = LIST_NEXT(inp, sctp_list);
                }
        }
}

/*
 * Free the association after un-hashing the remote port.
 */
void
sctp_free_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
        struct sctp_association *asoc;
        struct sctp_nets *net, *prev;
        struct sctp_laddr *laddr;
        struct sctp_tmit_chunk *chk;
        struct sctp_asconf_addr *aparam;
        struct sctp_socket_q_list *sq;
        int s;

        /* first, lets purge the entry from the hash table. */
        s = splsoftnet();
        if (stcb->asoc.state == 0) {
                printf("Freeing already free association:%p - huh??\n",
                    stcb);
                splx(s);
                return;
        }
        asoc = &stcb->asoc;
        asoc->state = 0;
        /* now clean up any other timers */
        callout_stop(&asoc->hb_timer.timer);
        callout_destroy(&asoc->hb_timer.timer);
        callout_stop(&asoc->dack_timer.timer);
        callout_destroy(&asoc->dack_timer.timer);
        callout_stop(&asoc->asconf_timer.timer);
        callout_destroy(&asoc->asconf_timer.timer);
        callout_stop(&asoc->shut_guard_timer.timer);
        callout_destroy(&asoc->shut_guard_timer.timer);
        callout_stop(&asoc->autoclose_timer.timer);
        callout_destroy(&asoc->autoclose_timer.timer);
        callout_stop(&asoc->delayed_event_timer.timer);
        callout_destroy(&asoc->delayed_event_timer.timer);
        TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
                callout_stop(&net->rxt_timer.timer);
                callout_stop(&net->pmtu_timer.timer);
                callout_destroy(&net->rxt_timer.timer);
                callout_destroy(&net->pmtu_timer.timer);
        }

        /* Iterator asoc being freed we send an
         * unlocked TCB. It returns with INP_INFO
         * and INP write locked and the TCB locked
         * too and of course the iterator lock
         * in place as well..
         */
        SCTP_TCB_UNLOCK(stcb);
        sctp_iterator_asoc_being_freed(inp, stcb);

        /* Null all of my entry's on the socket q */
        TAILQ_FOREACH(sq, &inp->sctp_queue_list, next_sq) {
                if (sq->tcb == stcb) {
                        sq->tcb = NULL;
                }
        }

        if (inp->sctp_tcb_at_block == (void *)stcb) {
                inp->error_on_block = ECONNRESET;
        }

        if (inp->sctp_tcbhash) {
                LIST_REMOVE(stcb, sctp_tcbhash);
        }
        /* Now lets remove it from the list of ALL associations in the EP */
        LIST_REMOVE(stcb, sctp_tcblist);
        SCTP_INP_WUNLOCK(inp);
        SCTP_ITERATOR_UNLOCK();


        /* pull from vtag hash */
        LIST_REMOVE(stcb, sctp_asocs);

        /*
         * Now before we can free the assoc, we must  remove all of the
         * networks and any other allocated space.. i.e. add removes here
         * before the SCTP_ZONE_FREE() of the tasoc entry.
         */

        sctp_add_vtag_to_timewait(inp, asoc->my_vtag);
        SCTP_INP_INFO_WUNLOCK();
        prev = NULL;
        while (!TAILQ_EMPTY(&asoc->nets)) {
                net = TAILQ_FIRST(&asoc->nets);
                /* pull from list */
                if ((sctppcbinfo.ipi_count_raddr == 0) || (prev == net)) {
                        break;
                }
                prev = net;
                TAILQ_REMOVE(&asoc->nets, net, sctp_next);
                rtcache_free(&net->ro);
                /* free it */
                net->ref_count = 0;
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_net, net);
                sctppcbinfo.ipi_count_raddr--;
        }
        /*
         * The chunk lists and such SHOULD be empty but we check them
         * just in case.
         */
        /* anything on the wheel needs to be removed */
        while (!TAILQ_EMPTY(&asoc->out_wheel)) {
                struct sctp_stream_out *outs;
                outs = TAILQ_FIRST(&asoc->out_wheel);
                TAILQ_REMOVE(&asoc->out_wheel, outs, next_spoke);
                /* now clean up any chunks here */
                chk = TAILQ_FIRST(&outs->outqueue);
                while (chk) {
                        TAILQ_REMOVE(&outs->outqueue, chk, sctp_next);
                        sctp_m_freem(chk->data);
                        chk->data = NULL;
                        chk->whoTo = NULL;
                        chk->asoc = NULL;
                        /* Free the chunk */
                        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                        sctppcbinfo.ipi_count_chunk--;
                        sctppcbinfo.ipi_gencnt_chunk++;
                        if ((int)sctppcbinfo.ipi_count_chunk < 0) {
                                panic("Chunk count is negative");
                        }
                        chk = TAILQ_FIRST(&outs->outqueue);
                }
                outs = TAILQ_FIRST(&asoc->out_wheel);
        }

        if (asoc->pending_reply) {
                free(asoc->pending_reply, M_PCB);
                asoc->pending_reply = NULL;
        }
        chk = TAILQ_FIRST(&asoc->pending_reply_queue);
        while (chk) {
                TAILQ_REMOVE(&asoc->pending_reply_queue, chk, sctp_next);
                sctp_m_freem(chk->data);
                chk->data = NULL;
                chk->whoTo = NULL;
                chk->asoc = NULL;
                /* Free the chunk */
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_chunk, chk);
                sctppcbinfo.ipi_count_chunk--;
                sctppcbinfo.ipi_gencnt_chunk++;
                if ((int)sctppcbinfo.ipi_count_chunk < 0) {
                        panic("Chunk count is negative");
                }
                chk = TAILQ_FIRST(&asoc->pending_reply_queue);
        }
        /* 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_m_freem(chk->data);
                        chk->data = 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_m_freem(chk->data);
                        chk->data = 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);
                }
        }
        /* control queue MAY not be empty */
        if (!TAILQ_EMPTY(&asoc->control_send_queue)) {
                chk = TAILQ_FIRST(&asoc->control_send_queue);
                while (chk) {
                        TAILQ_REMOVE(&asoc->control_send_queue, chk, sctp_next);
                        sctp_m_freem(chk->data);
                        chk->data = 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->control_send_queue);
                }
        }
        if (!TAILQ_EMPTY(&asoc->reasmqueue)) {
                chk = TAILQ_FIRST(&asoc->reasmqueue);
                while (chk) {
                        TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
                        sctp_m_freem(chk->data);
                        chk->data = 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->reasmqueue);
                }
        }
        if (!TAILQ_EMPTY(&asoc->delivery_queue)) {
                chk = TAILQ_FIRST(&asoc->delivery_queue);
                while (chk) {
                        TAILQ_REMOVE(&asoc->delivery_queue, chk, sctp_next);
                        sctp_m_freem(chk->data);
                        chk->data = 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->delivery_queue);
                }
        }
        if (asoc->mapping_array) {
                free(asoc->mapping_array, M_PCB);
                asoc->mapping_array = NULL;
        }

        /* the stream outs */
        if (asoc->strmout) {
                free(asoc->strmout, M_PCB);
                asoc->strmout = NULL;
        }
        asoc->streamoutcnt = 0;
        if (asoc->strmin) {
                int i;
                for (i = 0; i < asoc->streamincnt; i++) {
                        if (!TAILQ_EMPTY(&asoc->strmin[i].inqueue)) {
                                /* We have somethings on the streamin queue */
                                chk = TAILQ_FIRST(&asoc->strmin[i].inqueue);
                                while (chk) {
                                        TAILQ_REMOVE(&asoc->strmin[i].inqueue,
                                            chk, sctp_next);
                                        sctp_m_freem(chk->data);
                                        chk->data = 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->strmin[i].inqueue);
                                }
                        }
                }
                free(asoc->strmin, M_PCB);
                asoc->strmin = NULL;
        }
        asoc->streamincnt = 0;
        /* local addresses, if any */
        while (!LIST_EMPTY(&asoc->sctp_local_addr_list)) {
                laddr = LIST_FIRST(&asoc->sctp_local_addr_list);
                LIST_REMOVE(laddr, sctp_nxt_addr);
                SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, laddr);
                sctppcbinfo.ipi_count_laddr--;
        }
        /* pending asconf (address) parameters */
        while (!TAILQ_EMPTY(&asoc->asconf_queue)) {
                aparam = TAILQ_FIRST(&asoc->asconf_queue);
                TAILQ_REMOVE(&asoc->asconf_queue, aparam, next);
                free(aparam, M_PCB);
        }
        sctp_m_freem(asoc->last_asconf_ack_sent);
        asoc->last_asconf_ack_sent = NULL;
        /* Insert new items here :> */

        /* Get rid of LOCK */
        SCTP_TCB_LOCK_DESTROY(stcb);

        /* now clean up the tasoc itself */
        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_asoc, stcb);
        sctppcbinfo.ipi_count_asoc--;
        if ((inp->sctp_socket->so_snd.sb_cc) ||
            (inp->sctp_socket->so_snd.sb_mbcnt)) {
                /* This will happen when a abort is done */
                inp->sctp_socket->so_snd.sb_cc = 0;
                inp->sctp_socket->so_snd.sb_mbcnt = 0;
        }
        if (inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) {
                if ((inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL) == 0) {
                        if (inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) {
                                /*
                                 * For the base fd, that is NOT in TCP pool we
                                 * turn off the connected flag. This allows
                                 * non-listening endpoints to connect/shutdown/
                                 * connect.
                                 */
                                inp->sctp_flags &= ~SCTP_PCB_FLAGS_CONNECTED;
                                soisdisconnected(inp->sctp_socket);
                        }
                        /*
                         * For those that are in the TCP pool we just leave
                         * so it cannot be used. When they close the fd we
                         * will free it all.
                         */
                }
        }
        if (inp->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) {
                sctp_inpcb_free(inp, 0);
        }
        splx(s);
}


/*
 * determine if a destination is "reachable" based upon the addresses
 * bound to the current endpoint (e.g. only v4 or v6 currently bound)
 */
/*
 * FIX: if we allow assoc-level bindx(), then this needs to be fixed
 * to use assoc level v4/v6 flags, as the assoc *may* not have the
 * same address types bound as its endpoint
 */
int
sctp_destination_is_reachable(struct sctp_tcb *stcb, const struct sockaddr *destaddr)
{
        struct sctp_inpcb *inp;
        int answer;

        /* No locks here, the TCB, in all cases is already
         * locked and an assoc is up. There is either a
         * INP lock by the caller applied (in asconf case when
         * deleting an address) or NOT in the HB case, however
         * if HB then the INP increment is up and the INP
         * will not be removed (on top of the fact that
         * we have a TCB lock). So we only want to
         * read the sctp_flags, which is either bound-all
         * or not.. no protection needed since once an
         * assoc is up you can't be changing your binding.
         */
        inp = stcb->sctp_ep;
        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                /* if bound all, destination is not restricted */
                /* RRS: Question during lock work: Is this
                 * correct? If you are bound-all you still
                 * might need to obey the V4--V6 flags???
                 * IMO this bound-all stuff needs to be removed!
                 */
                return (1);
        }
        /* NOTE: all "scope" checks are done when local addresses are added */
        if (destaddr->sa_family == AF_INET6) {
                answer = inp->inp_vflag & INP_IPV6;
        } else if (destaddr->sa_family == AF_INET) {
                answer = inp->inp_vflag & INP_IPV4;
        } else {
                /* invalid family, so it's unreachable */
                answer = 0;
        }
        return (answer);
}

/*
 * update the inp_vflags on an endpoint
 */
static void
sctp_update_ep_vflag(struct sctp_inpcb *inp) {
        struct sctp_laddr *laddr;

        /* first clear the flag */
        inp->inp_vflag = 0;

        /* set the flag based on addresses on the ep list */
        LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                if (laddr->ifa == NULL) {
#ifdef SCTP_DEBUG
                        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                                printf("An ounce of prevention is worth a pound of cure\n");
                        }
#endif /* SCTP_DEBUG */
                        continue;
                }
                if (laddr->ifa->ifa_addr) {
                        continue;
                }
                if (laddr->ifa->ifa_addr->sa_family == AF_INET6) {
                        inp->inp_vflag |= INP_IPV6;
                } else if (laddr->ifa->ifa_addr->sa_family == AF_INET) {
                        inp->inp_vflag |= INP_IPV4;
                }
        }
}

/*
 * Add the address to the endpoint local address list
 * There is nothing to be done if we are bound to all addresses
 */
int
sctp_add_local_addr_ep(struct sctp_inpcb *inp, struct ifaddr *ifa)
{
        struct sctp_laddr *laddr;
        int fnd, error;
        fnd = 0;

        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                /* You are already bound to all. You have it already */
                return (0);
        }
        if (ifa->ifa_addr->sa_family == AF_INET6) {
                struct in6_ifaddr *ifa6;
                ifa6 = (struct in6_ifaddr *)ifa;
                if (ifa6->ia6_flags & (IN6_IFF_DETACHED |
                    IN6_IFF_DEPRECATED | IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))
                        /* Can't bind a non-existent addr. */
                        return (-1);
        }
        /* first, is it already present? */
        LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                if (laddr->ifa == ifa) {
                        fnd = 1;
                        break;
                }
        }

        if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) && (fnd == 0)) {
                /* Not bound to all */
                error = sctp_insert_laddr(&inp->sctp_addr_list, ifa);
                if (error != 0)
                        return (error);
                inp->laddr_count++;
                /* update inp_vflag flags */
                if (ifa->ifa_addr->sa_family == AF_INET6) {
                        inp->inp_vflag |= INP_IPV6;
                } else if (ifa->ifa_addr->sa_family == AF_INET) {
                        inp->inp_vflag |= INP_IPV4;
                }
        }
        return (0);
}


/*
 * select a new (hopefully reachable) destination net
 * (should only be used when we deleted an ep addr that is the
 * only usable source address to reach the destination net)
 */
static void
sctp_select_primary_destination(struct sctp_tcb *stcb)
{
        struct sctp_nets *net;

        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                /* for now, we'll just pick the first reachable one we find */
                if (net->dest_state & SCTP_ADDR_UNCONFIRMED)
                        continue;
                if (sctp_destination_is_reachable(stcb,
                        rtcache_getdst(&net->ro))) {
                        /* found a reachable destination */
                        stcb->asoc.primary_destination = net;
                }
        }
        /* I can't there from here! ...we're gonna die shortly... */
}


/*
 * Delete the address from the endpoint local address list
 * There is nothing to be done if we are bound to all addresses
 */
int
sctp_del_local_addr_ep(struct sctp_inpcb *inp, struct ifaddr *ifa)
{
        struct sctp_laddr *laddr;
        int fnd;
        fnd = 0;
        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                /* You are already bound to all. You have it already */
                return (EINVAL);
        }

        LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                if (laddr->ifa == ifa) {
                        fnd = 1;
                        break;
                }
        }
        if (fnd && (inp->laddr_count < 2)) {
                /* can't delete unless there are at LEAST 2 addresses */
                return (-1);
        }
        if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) && (fnd)) {
                /*
                 * clean up any use of this address
                 * go through our associations and clear any
                 *  last_used_address that match this one
                 * for each assoc, see if a new primary_destination is needed
                 */
                struct sctp_tcb *stcb;

                /* clean up "next_addr_touse" */
                if (inp->next_addr_touse == laddr)
                        /* delete this address */
                        inp->next_addr_touse = NULL;

                /* clean up "last_used_address" */
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        if (stcb->asoc.last_used_address == laddr)
                                /* delete this address */
                                stcb->asoc.last_used_address = NULL;
                } /* for each tcb */

                /* remove it from the ep list */
                sctp_remove_laddr(laddr);
                inp->laddr_count--;
                /* update inp_vflag flags */
                sctp_update_ep_vflag(inp);
                /* select a new primary destination if needed */
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        /* presume caller (sctp_asconf.c) already owns INP lock */
                        SCTP_TCB_LOCK(stcb);
                        if (sctp_destination_is_reachable(stcb,
                            rtcache_getdst(&stcb->asoc.primary_destination->ro)) == 0) {
                                sctp_select_primary_destination(stcb);
                        }
                        SCTP_TCB_UNLOCK(stcb);
                } /* for each tcb */
        }
        return (0);
}

/*
 * Add the addr to the TCB local address list
 * For the BOUNDALL or dynamic case, this is a "pending" address list
 * (eg. addresses waiting for an ASCONF-ACK response)
 * For the subset binding, static case, this is a "valid" address list
 */
int
sctp_add_local_addr_assoc(struct sctp_tcb *stcb, struct ifaddr *ifa)
{
        struct sctp_laddr *laddr;
        int error;

        /* Assumes TCP is locked.. and possiblye
         * the INP. May need to confirm/fix that if
         * we need it and is not the case.
         */
        if (ifa->ifa_addr->sa_family == AF_INET6) {
                struct in6_ifaddr *ifa6;
                ifa6 = (struct in6_ifaddr *)ifa;
                if (ifa6->ia6_flags & (IN6_IFF_DETACHED |
                    /* IN6_IFF_DEPRECATED | */
                    IN6_IFF_ANYCAST |
                    IN6_IFF_NOTREADY))
                        /* Can't bind a non-existent addr. */
                        return (-1);
        }
        /* does the address already exist? */
        LIST_FOREACH(laddr, &stcb->asoc.sctp_local_addr_list, sctp_nxt_addr) {
                if (laddr->ifa == ifa) {
                        return (-1);
                }
        }

        /* add to the list */
        error = sctp_insert_laddr(&stcb->asoc.sctp_local_addr_list, ifa);
        if (error != 0)
                return (error);
        return (0);
}

/*
 * insert an laddr entry with the given ifa for the desired list
 */
int
sctp_insert_laddr(struct sctpladdr *list, struct ifaddr *ifa) {
        struct sctp_laddr *laddr;
        int s;

        s = splsoftnet();

        laddr = (struct sctp_laddr *)SCTP_ZONE_GET(sctppcbinfo.ipi_zone_laddr);
        if (laddr == NULL) {
                /* out of memory? */
                splx(s);
                return (EINVAL);
        }
        sctppcbinfo.ipi_count_laddr++;
        sctppcbinfo.ipi_gencnt_laddr++;
        memset(laddr, 0, sizeof(*laddr));
        laddr->ifa = ifa;
        /* insert it */
        LIST_INSERT_HEAD(list, laddr, sctp_nxt_addr);

        splx(s);
        return (0);
}

/*
 * Remove an laddr entry from the local address list (on an assoc)
 */
void
sctp_remove_laddr(struct sctp_laddr *laddr)
{
        int s;
        s = splsoftnet();
        /* remove from the list */
        LIST_REMOVE(laddr, sctp_nxt_addr);
        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_laddr, laddr);
        sctppcbinfo.ipi_count_laddr--;
        sctppcbinfo.ipi_gencnt_laddr++;

        splx(s);
}

/*
 * Remove an address from the TCB local address list
 */
int
sctp_del_local_addr_assoc(struct sctp_tcb *stcb, struct ifaddr *ifa)
{
        struct sctp_inpcb *inp;
        struct sctp_laddr *laddr;

        /* This is called by asconf work. It is assumed that
         * a) The TCB is locked
         * and
         * b) The INP is locked.
         * This is true in as much as I can trace through
         * the entry asconf code where I did these locks.
         * Again, the ASCONF code is a bit different in
         * that it does lock the INP during its work often
         * times. This must be since we don't want other
         * proc's looking up things while what they are
         * looking up is changing :-D
         */

        inp = stcb->sctp_ep;
        /* if subset bound and don't allow ASCONF's, can't delete last */
        if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) &&
            ((inp->sctp_flags & SCTP_PCB_FLAGS_DO_ASCONF) == 0)) {
                if (stcb->asoc.numnets < 2) {
                        /* can't delete last address */
                        return (-1);
                }
        }

        LIST_FOREACH(laddr, &stcb->asoc.sctp_local_addr_list, sctp_nxt_addr) {
                /* remove the address if it exists */
                if (laddr->ifa == NULL)
                        continue;
                if (laddr->ifa == ifa) {
                        sctp_remove_laddr(laddr);
                        return (0);
                }
        }

        /* address not found! */
        return (-1);
}

/*
 * Remove an address from the TCB local address list
 * lookup using a sockaddr addr
 */
int
sctp_del_local_addr_assoc_sa(struct sctp_tcb *stcb, struct sockaddr *sa)
{
        struct sctp_inpcb *inp;
        struct sctp_laddr *laddr;
        struct sockaddr *l_sa;

        /*
         * This function I find does not seem to have a caller.
         * As such we NEED TO DELETE this code. If we do
         * find a caller, the caller MUST have locked the TCB
         * at the least and probably the INP as well.
         */
        inp = stcb->sctp_ep;
        /* if subset bound and don't allow ASCONF's, can't delete last */
        if (((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) &&
            ((inp->sctp_flags & SCTP_PCB_FLAGS_DO_ASCONF) == 0)) {
                if (stcb->asoc.numnets < 2) {
                        /* can't delete last address */
                        return (-1);
                }
        }

        LIST_FOREACH(laddr, &stcb->asoc.sctp_local_addr_list, sctp_nxt_addr) {
                /* make sure the address exists */
                if (laddr->ifa == NULL)
                        continue;
                if (laddr->ifa->ifa_addr == NULL)
                        continue;

                l_sa = laddr->ifa->ifa_addr;
                if (l_sa->sa_family == AF_INET6) {
                        /* IPv6 address */
                        struct sockaddr_in6 *sin1, *sin2;
                        sin1 = (struct sockaddr_in6 *)l_sa;
                        sin2 = (struct sockaddr_in6 *)sa;
                        if (memcmp(&sin1->sin6_addr, &sin2->sin6_addr,
                            sizeof(struct in6_addr)) == 0) {
                                /* matched */
                                sctp_remove_laddr(laddr);
                                return (0);
                        }
                } else if (l_sa->sa_family == AF_INET) {
                        /* IPv4 address */
                        struct sockaddr_in *sin1, *sin2;
                        sin1 = (struct sockaddr_in *)l_sa;
                        sin2 = (struct sockaddr_in *)sa;
                        if (sin1->sin_addr.s_addr == sin2->sin_addr.s_addr) {
                                /* matched */
                                sctp_remove_laddr(laddr);
                                return (0);
                        }
                } else {
                        /* invalid family */
                        return (-1);
                }
        } /* end foreach */
        /* address not found! */
        return (-1);
}

static char sctp_pcb_initialized = 0;

#if defined(__FreeBSD__) || defined(__APPLE__)
/* sysctl */
static int sctp_max_number_of_assoc = SCTP_MAX_NUM_OF_ASOC;
static int sctp_scale_up_for_address = SCTP_SCALE_FOR_ADDR;

#endif /* FreeBSD || APPLE */

#ifndef SCTP_TCBHASHSIZE
#define SCTP_TCBHASHSIZE 1024
#endif

#ifndef SCTP_CHUNKQUEUE_SCALE
#define SCTP_CHUNKQUEUE_SCALE 10
#endif

void
sctp_pcb_init(void)
{
        /*
         * SCTP initialization for the PCB structures
         * should be called by the sctp_init() function.
         */
        int i;
        int hashtblsize = SCTP_TCBHASHSIZE;

#if defined(__FreeBSD__) || defined(__APPLE__)
        int sctp_chunkscale = SCTP_CHUNKQUEUE_SCALE;
#endif

        if (sctp_pcb_initialized != 0) {
                /* error I was called twice */
                return;
        }
        sctp_pcb_initialized = 1;

        /* Init all peg counts */
        for (i = 0; i < SCTP_NUMBER_OF_PEGS; i++) {
                sctp_pegs[i] = 0;
        }

        /* init the empty list of (All) Endpoints */
        LIST_INIT(&sctppcbinfo.listhead);

        /* init the iterator head */
        LIST_INIT(&sctppcbinfo.iteratorhead);

        /* init the hash table of endpoints */
#if defined(__FreeBSD__)
#if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 440000
        TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", &hashtblsize);
        TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", &sctp_pcbtblsize);
        TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", &sctp_chunkscale);
#else
        TUNABLE_INT_FETCH("net.inet.sctp.tcbhashsize", SCTP_TCBHASHSIZE,
            hashtblsize);
        TUNABLE_INT_FETCH("net.inet.sctp.pcbhashsize", SCTP_PCBHASHSIZE,
            sctp_pcbtblsize);
        TUNABLE_INT_FETCH("net.inet.sctp.chunkscale", SCTP_CHUNKQUEUE_SCALE,
            sctp_chunkscale);
#endif
#endif

        sctppcbinfo.sctp_asochash = hashinit((hashtblsize * 31), HASH_LIST,
                        M_WAITOK, &sctppcbinfo.hashasocmark);

        sctppcbinfo.sctp_ephash = hashinit(hashtblsize, HASH_LIST,
                        M_WAITOK, &sctppcbinfo.hashmark);

        sctppcbinfo.sctp_tcpephash = hashinit(hashtblsize, HASH_LIST,
                        M_WAITOK, &sctppcbinfo.hashtcpmark);

        sctppcbinfo.hashtblsize = hashtblsize;

        /* init the zones */
        /*
         * FIX ME: Should check for NULL returns, but if it does fail we
         * are doomed to panic anyways... add later maybe.
         */
        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_ep, "sctp_ep",
            sizeof(struct sctp_inpcb), maxsockets);

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_asoc, "sctp_asoc",
            sizeof(struct sctp_tcb), sctp_max_number_of_assoc);

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_laddr, "sctp_laddr",
            sizeof(struct sctp_laddr),
            (sctp_max_number_of_assoc * sctp_scale_up_for_address));

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_net, "sctp_raddr",
            sizeof(struct sctp_nets),
            (sctp_max_number_of_assoc * sctp_scale_up_for_address));

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_chunk, "sctp_chunk",
            sizeof(struct sctp_tmit_chunk),
            (sctp_max_number_of_assoc * sctp_scale_up_for_address *
            sctp_chunkscale));

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_sockq, "sctp_sockq",
            sizeof(struct sctp_socket_q_list),
            (sctp_max_number_of_assoc * sctp_scale_up_for_address *
            sctp_chunkscale));

        SCTP_ZONE_INIT(sctppcbinfo.ipi_zone_hash, "sctp_hash",
                       sizeof(void *) * sctp_pcbtblsize, maxsockets);

        /* Master Lock INIT for info structure */
        SCTP_INP_INFO_LOCK_INIT();
        SCTP_ITERATOR_LOCK_INIT();
        /* not sure if we need all the counts */
        sctppcbinfo.ipi_count_ep = 0;
        sctppcbinfo.ipi_gencnt_ep = 0;
        /* assoc/tcb zone info */
        sctppcbinfo.ipi_count_asoc = 0;
        sctppcbinfo.ipi_gencnt_asoc = 0;
        /* local addrlist zone info */
        sctppcbinfo.ipi_count_laddr = 0;
        sctppcbinfo.ipi_gencnt_laddr = 0;
        /* remote addrlist zone info */
        sctppcbinfo.ipi_count_raddr = 0;
        sctppcbinfo.ipi_gencnt_raddr = 0;
        /* chunk info */
        sctppcbinfo.ipi_count_chunk = 0;
        sctppcbinfo.ipi_gencnt_chunk = 0;

        /* socket queue zone info */
        sctppcbinfo.ipi_count_sockq = 0;
        sctppcbinfo.ipi_gencnt_sockq = 0;

        /* mbuf tracker */
        sctppcbinfo.mbuf_track = 0;
        /* port stuff */
        sctppcbinfo.lastlow = anonportmin;

        /* Init the TIMEWAIT list */
        for (i = 0; i < SCTP_STACK_VTAG_HASH_SIZE; i++) {
                LIST_INIT(&sctppcbinfo.vtag_timewait[i]);
        }

#if defined(_SCTP_NEEDS_CALLOUT_) && !defined(__APPLE__)
        TAILQ_INIT(&sctppcbinfo.callqueue);
#endif

}

int
sctp_load_addresses_from_init(struct sctp_tcb *stcb, struct mbuf *m,
    int iphlen, int offset, int limit, struct sctphdr *sh,
    struct sockaddr *altsa)
{
        /*
         * grub through the INIT pulling addresses and
         * loading them to the nets structure in the asoc.
         * The from address in the mbuf should also be loaded
         * (if it is not already). This routine can be called
         * with either INIT or INIT-ACK's as long as the
         * m points to the IP packet and the offset points
         * to the beginning of the parameters.
         */
        struct sctp_inpcb *inp, *l_inp;
        struct sctp_nets *net, *net_tmp;
        struct ip *iph;
        struct sctp_paramhdr *phdr, parm_buf;
        struct sctp_tcb *stcb_tmp;
        u_int16_t ptype, plen;
        struct sockaddr *sa;
        struct sockaddr_storage dest_store;
        struct sockaddr *local_sa = (struct sockaddr *)&dest_store;
        struct sockaddr_in sin;
        struct sockaddr_in6 sin6;

        /* First get the destination address setup too. */
        memset(&sin, 0, sizeof(sin));
        memset(&sin6, 0, sizeof(sin6));

        sin.sin_family = AF_INET;
        sin.sin_len = sizeof(sin);
        sin.sin_port = stcb->rport;

        sin6.sin6_family = AF_INET6;
        sin6.sin6_len = sizeof(struct sockaddr_in6);
        sin6.sin6_port = stcb->rport;
        if (altsa == NULL) {
                iph = mtod(m, struct ip *);
                if (iph->ip_v == IPVERSION) {
                        /* its IPv4 */
                        struct sockaddr_in *sin_2;
                        sin_2 = (struct sockaddr_in *)(local_sa);
                        memset(sin_2, 0, sizeof(sin));
                        sin_2->sin_family = AF_INET;
                        sin_2->sin_len = sizeof(sin);
                        sin_2->sin_port = sh->dest_port;
                        sin_2->sin_addr.s_addr = iph->ip_dst.s_addr ;
                        sin.sin_addr = iph->ip_src;
                        sa = (struct sockaddr *)&sin;
                } else if (iph->ip_v == (IPV6_VERSION >> 4)) {
                        /* its IPv6 */
                        struct ip6_hdr *ip6;
                        struct sockaddr_in6 *sin6_2;

                        ip6 = mtod(m, struct ip6_hdr *);
                        sin6_2 = (struct sockaddr_in6 *)(local_sa);
                        memset(sin6_2, 0, sizeof(sin6));
                        sin6_2->sin6_family = AF_INET6;
                        sin6_2->sin6_len = sizeof(struct sockaddr_in6);
                        sin6_2->sin6_port = sh->dest_port;
                        sin6.sin6_addr = ip6->ip6_src;
                        sa = (struct sockaddr *)&sin6;
                } else {
                        sa = NULL;
                }
        } else {
                /*
                 * For cookies we use the src address NOT from the packet
                 * but from the original INIT
                 */
                sa = altsa;
        }
        /* Turn off ECN until we get through all params */
        stcb->asoc.ecn_allowed = 0;

        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                /* mark all addresses that we have currently on the list */
                net->dest_state |= SCTP_ADDR_NOT_IN_ASSOC;
        }
        /* does the source address already exist? if so skip it */
        l_inp = inp = stcb->sctp_ep;
        stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net_tmp, local_sa, stcb);
        if ((stcb_tmp == NULL && inp == stcb->sctp_ep) || inp == NULL) {
                /* we must add the source address */
                /* no scope set here since we have a tcb already. */
                if ((sa->sa_family == AF_INET) &&
                    (stcb->asoc.ipv4_addr_legal)) {
                        if (sctp_add_remote_addr(stcb, sa, 0, 2)) {
                                return (-1);
                        }
                } else if ((sa->sa_family == AF_INET6) &&
                    (stcb->asoc.ipv6_addr_legal)) {
                        if (sctp_add_remote_addr(stcb, sa, 0, 3)) {
                                return (-1);
                        }
                }
        } else {
                if (net_tmp != NULL && stcb_tmp == stcb) {
                        net_tmp->dest_state &= ~SCTP_ADDR_NOT_IN_ASSOC;
                } else if (stcb_tmp != stcb) {
                        /* It belongs to another association? */
                        return (-1);
                }
        }
        /* since a unlock occurred we must check the
         * TCB's state and the pcb's gone flags.
         */
        if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                /* the user freed the ep */
                return (-1);
        }
        if (stcb->asoc.state == 0) {
                /* the assoc was freed? */
                return (-1);
        }

        /* now we must go through each of the params. */
        phdr = sctp_get_next_param(m, offset, &parm_buf, sizeof(parm_buf));
        while (phdr) {
                ptype = ntohs(phdr->param_type);
                plen = ntohs(phdr->param_length);
                /*printf("ptype => %d, plen => %d\n", ptype, plen);*/
                if (offset + plen > limit) {
                        break;
                }
                if (plen == 0) {
                        break;
                }
                if ((ptype == SCTP_IPV4_ADDRESS) &&
                    (stcb->asoc.ipv4_addr_legal)) {
                        struct sctp_ipv4addr_param *p4, p4_buf;
                        /* ok get the v4 address and check/add */
                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&p4_buf, sizeof(p4_buf));
                        if (plen != sizeof(struct sctp_ipv4addr_param) ||
                            phdr == NULL) {
                                return (-1);
                        }
                        p4 = (struct sctp_ipv4addr_param *)phdr;
                        sin.sin_addr.s_addr = p4->addr;
                        sa = (struct sockaddr *)&sin;
                        inp = stcb->sctp_ep;
                        stcb_tmp = sctp_findassociation_ep_addr(&inp, sa, &net,
                            local_sa, stcb);

                        if ((stcb_tmp== NULL && inp == stcb->sctp_ep) ||
                            inp == NULL) {
                                /* we must add the source address */
                                /* no scope set since we have a tcb already */

                                /* we must validate the state again here */
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        return (-1);
                                }
                                if (sctp_add_remote_addr(stcb, sa, 0, 4)) {
                                        return (-1);
                                }
                        } else if (stcb_tmp == stcb) {
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        return (-1);
                                }
                                if (net != NULL) {
                                        /* clear flag */
                                        net->dest_state &=
                                            ~SCTP_ADDR_NOT_IN_ASSOC;
                                }
                        } else {
                                /* strange, address is in another assoc?
                                 * straighten out locks.
                                 */
                                SCTP_TCB_UNLOCK(stcb_tmp);
                                SCTP_INP_RLOCK(inp);
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        SCTP_INP_RUNLOCK(l_inp);
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        SCTP_INP_RUNLOCK(l_inp);
                                        return (-1);
                                }
                                SCTP_TCB_LOCK(stcb);
                                SCTP_INP_RUNLOCK(stcb->sctp_ep);
                                return (-1);
                        }
                } else if ((ptype == SCTP_IPV6_ADDRESS) &&
                    (stcb->asoc.ipv6_addr_legal)) {
                        /* ok get the v6 address and check/add */
                        struct sctp_ipv6addr_param *p6, p6_buf;
                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&p6_buf, sizeof(p6_buf));
                        if (plen != sizeof(struct sctp_ipv6addr_param) ||
                            phdr == NULL) {
                                return (-1);
                        }
                        p6 = (struct sctp_ipv6addr_param *)phdr;
                        memcpy((void *)&sin6.sin6_addr, p6->addr,
                            sizeof(p6->addr));
                        sa = (struct sockaddr *)&sin6;
                        inp = stcb->sctp_ep;
                        stcb_tmp= sctp_findassociation_ep_addr(&inp, sa, &net,
                            local_sa, stcb);
                        if (stcb_tmp == NULL && (inp == stcb->sctp_ep ||
                            inp == NULL)) {
                                /* we must validate the state again here */
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        return (-1);
                                }
                                /* we must add the address, no scope set */
                                if (sctp_add_remote_addr(stcb, sa, 0, 5)) {
                                        return (-1);
                                }
                        } else if (stcb_tmp == stcb) {
                                /* we must validate the state again here */
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        return (-1);
                                }
                                if (net != NULL) {
                                        /* clear flag */
                                        net->dest_state &=
                                            ~SCTP_ADDR_NOT_IN_ASSOC;
                                }
                        } else {
                                /* strange, address is in another assoc?
                                 * straighten out locks.
                                 */
                                SCTP_TCB_UNLOCK(stcb_tmp);
                                SCTP_INP_RLOCK(l_inp);
                                /* we must validate the state again here */
                                if (l_inp->sctp_flags & (SCTP_PCB_FLAGS_SOCKET_GONE|SCTP_PCB_FLAGS_SOCKET_ALLGONE)) {
                                        /* the user freed the ep */
                                        SCTP_INP_RUNLOCK(l_inp);
                                        return (-1);
                                }
                                if (stcb->asoc.state == 0) {
                                        /* the assoc was freed? */
                                        SCTP_INP_RUNLOCK(l_inp);
                                        return (-1);
                                }
                                SCTP_TCB_LOCK(stcb);
                                SCTP_INP_RUNLOCK(l_inp);
                                return (-1);
                        }
                } else if (ptype == SCTP_ECN_CAPABLE) {
                        stcb->asoc.ecn_allowed = 1;
                } else if (ptype == SCTP_ULP_ADAPTION) {
                        if (stcb->asoc.state != SCTP_STATE_OPEN) {
                                struct sctp_adaption_layer_indication ai, *aip;

                                phdr = sctp_get_next_param(m, offset,
                                                           (struct sctp_paramhdr *)&ai, sizeof(ai));
                                aip = (struct sctp_adaption_layer_indication *)phdr;
                                sctp_ulp_notify(SCTP_NOTIFY_ADAPTION_INDICATION,
                                                stcb, ntohl(aip->indication), NULL);
                        }
                } else if (ptype == SCTP_SET_PRIM_ADDR) {
                        struct sctp_asconf_addr_param lstore, *fee;
                        struct sctp_asconf_addrv4_param *fii;
                        int lptype;
                        struct sockaddr *lsa = NULL;

                        stcb->asoc.peer_supports_asconf = 1;
                        stcb->asoc.peer_supports_asconf_setprim = 1;
                        if (plen > sizeof(lstore)) {
                                return (-1);
                        }
                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&lstore, plen);
                        if (phdr == NULL) {
                                return (-1);
                        }

                        fee  = (struct sctp_asconf_addr_param *)phdr;
                        lptype = ntohs(fee->addrp.ph.param_type);
                        if (lptype == SCTP_IPV4_ADDRESS) {
                                if (plen !=
                                    sizeof(struct sctp_asconf_addrv4_param)) {
                                        printf("Sizeof setprim in init/init ack not %d but %d - ignored\n",
                                           (int)sizeof(struct sctp_asconf_addrv4_param),
                                           plen);
                                } else {
                                        fii = (struct sctp_asconf_addrv4_param *)fee;
                                        sin.sin_addr.s_addr = fii->addrp.addr;
                                        lsa = (struct sockaddr *)&sin;
                                }
                        } else if (lptype == SCTP_IPV6_ADDRESS) {
                                if (plen !=
                                    sizeof(struct sctp_asconf_addr_param)) {
                                        printf("Sizeof setprim (v6) in init/init ack not %d but %d - ignored\n",
                                           (int)sizeof(struct sctp_asconf_addr_param),
                                           plen);
                                } else {
                                        memcpy(sin6.sin6_addr.s6_addr,
                                            fee->addrp.addr,
                                            sizeof(fee->addrp.addr));
                                        lsa = (struct sockaddr *)&sin6;
                                }
                        }
                        if (lsa) {
                                sctp_set_primary_addr(stcb, sa, NULL);
                        }

                } else if (ptype == SCTP_PRSCTP_SUPPORTED) {
                        /* Peer supports pr-sctp */
                        stcb->asoc.peer_supports_prsctp = 1;
                } else if (ptype == SCTP_SUPPORTED_CHUNK_EXT) {
                        /* A supported extension chunk */
                        struct sctp_supported_chunk_types_param *pr_supported;
                        uint8_t local_store[128];
                        int num_ent, i;

                        phdr = sctp_get_next_param(m, offset,
                            (struct sctp_paramhdr *)&local_store, plen);
                        if (phdr == NULL) {
                                return (-1);
                        }
                        stcb->asoc.peer_supports_asconf = 0;
                        stcb->asoc.peer_supports_asconf_setprim = 0;
                        stcb->asoc.peer_supports_prsctp = 0;
                        stcb->asoc.peer_supports_pktdrop = 0;
                        stcb->asoc.peer_supports_strreset = 0;
                        pr_supported = (struct sctp_supported_chunk_types_param *)phdr;
                        num_ent = plen - sizeof(struct sctp_paramhdr);
                        for (i=0; i<num_ent; i++) {
                                switch (pr_supported->chunk_types[i]) {
                                case SCTP_ASCONF:
                                        stcb->asoc.peer_supports_asconf = 1;
                                        stcb->asoc.peer_supports_asconf_setprim = 1;
                                        break;
                                case SCTP_ASCONF_ACK:
                                        stcb->asoc.peer_supports_asconf = 1;
                                        stcb->asoc.peer_supports_asconf_setprim = 1;
                                        break;
                                case SCTP_FORWARD_CUM_TSN:
                                        stcb->asoc.peer_supports_prsctp = 1;
                                        break;
                                case SCTP_PACKET_DROPPED:
                                        stcb->asoc.peer_supports_pktdrop = 1;
                                        break;
                                case SCTP_STREAM_RESET:
                                        stcb->asoc.peer_supports_strreset = 1;
                                        break;
                                default:
                                        /* one I have not learned yet */
                                        break;

                                }
                        }
                } else if (ptype == SCTP_ECN_NONCE_SUPPORTED) {
                        /* Peer supports ECN-nonce */
                        stcb->asoc.peer_supports_ecn_nonce = 1;
                        stcb->asoc.ecn_nonce_allowed = 1;
                } else if ((ptype == SCTP_HEARTBEAT_INFO) ||
                           (ptype == SCTP_STATE_COOKIE) ||
                           (ptype == SCTP_UNRECOG_PARAM) ||
                           (ptype == SCTP_COOKIE_PRESERVE) ||
                           (ptype == SCTP_SUPPORTED_ADDRTYPE) ||
                           (ptype == SCTP_ADD_IP_ADDRESS) ||
                           (ptype == SCTP_DEL_IP_ADDRESS) ||
                           (ptype == SCTP_ERROR_CAUSE_IND) ||
                           (ptype == SCTP_SUCCESS_REPORT)) {
                        /* don't care */;
                } else {
                        if ((ptype & 0x8000) == 0x0000) {
                                /* must stop processing the rest of
                                 * the param's. Any report bits were
                                 * handled with the call to sctp_arethere_unrecognized_parameters()
                                 * when the INIT or INIT-ACK was first seen.
                                 */
                                break;
                        }
                }
                offset += SCTP_SIZE32(plen);
                if (offset >= limit) {
                        break;
                }
                phdr = sctp_get_next_param(m, offset, &parm_buf,
                    sizeof(parm_buf));
        }
        /* Now check to see if we need to purge any addresses */
        for (net = TAILQ_FIRST(&stcb->asoc.nets); net != NULL; net = net_tmp) {
                net_tmp = TAILQ_NEXT(net, sctp_next);
                if ((net->dest_state & SCTP_ADDR_NOT_IN_ASSOC) ==
                    SCTP_ADDR_NOT_IN_ASSOC) {
                        /* This address has been removed from the asoc */
                        /* remove and free it */
                        stcb->asoc.numnets--;
                        TAILQ_REMOVE(&stcb->asoc.nets, net, sctp_next);
                        sctp_free_remote_addr(net);
                        if (net == stcb->asoc.primary_destination) {
                                stcb->asoc.primary_destination = NULL;
                                sctp_select_primary_destination(stcb);
                        }
                }
        }
        return (0);
}

int
sctp_set_primary_addr(struct sctp_tcb *stcb, struct sockaddr *sa,
    struct sctp_nets *net)
{
        /* make sure the requested primary address exists in the assoc */
        if (net == NULL && sa)
                net = sctp_findnet(stcb, sa);

        if (net == NULL) {
                /* didn't find the requested primary address! */
                return (-1);
        } else {
                /* set the primary address */
                if (net->dest_state & SCTP_ADDR_UNCONFIRMED) {
                        /* Must be confirmed */
                        return (-1);
                }
                stcb->asoc.primary_destination = net;
                net->dest_state &= ~SCTP_ADDR_WAS_PRIMARY;
                return (0);
        }
}


int
sctp_is_vtag_good(struct sctp_inpcb *inp, u_int32_t tag, struct timeval *now)
{
        /*
         * This function serves two purposes. It will see if a TAG can be
         * re-used and return 1 for yes it is ok and 0 for don't use that
         * tag.
         * A secondary function it will do is purge out old tags that can
         * be removed.
         */
        struct sctpasochead *head;
        struct sctpvtaghead *chain;
        struct sctp_tagblock *twait_block;
        struct sctp_tcb *stcb;

        int i;
        SCTP_INP_INFO_WLOCK();
        chain = &sctppcbinfo.vtag_timewait[(tag % SCTP_STACK_VTAG_HASH_SIZE)];
        /* First is the vtag in use ? */

        head = &sctppcbinfo.sctp_asochash[SCTP_PCBHASH_ASOC(tag,
            sctppcbinfo.hashasocmark)];
        if (head == NULL) {
                SCTP_INP_INFO_WUNLOCK();
                return (0);
        }
        LIST_FOREACH(stcb, head, sctp_asocs) {
                if (stcb->asoc.my_vtag == tag) {
                        /* We should remove this if and
                         * return 0 always if we want vtags
                         * unique across all endpoints. For
                         * now within a endpoint is ok.
                         */
                        if (inp == stcb->sctp_ep) {
                                /* bad tag, in use */
                                SCTP_INP_INFO_WUNLOCK();
                                return (0);
                        }
                }
        }
        if (!LIST_EMPTY(chain)) {
                /*
                 * Block(s) are present, lets see if we have this tag in
                 * the list
                 */
                LIST_FOREACH(twait_block, chain, sctp_nxt_tagblock) {
                        for (i = 0; i < SCTP_NUMBER_IN_VTAG_BLOCK; i++) {
                                if (twait_block->vtag_block[i].v_tag == 0) {
                                        /* not used */
                                        continue;
                                } else if ((long)twait_block->vtag_block[i].tv_sec_at_expire >
                                    now->tv_sec) {
                                        /* Audit expires this guy */
                                        twait_block->vtag_block[i].tv_sec_at_expire = 0;
                                        twait_block->vtag_block[i].v_tag = 0;
                                } else if (twait_block->vtag_block[i].v_tag ==
                                    tag) {
                                        /* Bad tag, sorry :< */
                                        SCTP_INP_INFO_WUNLOCK();
                                        return (0);
                                }
                        }
                }
        }
        /* Not found, ok to use the tag */
        SCTP_INP_INFO_WUNLOCK();
        return (1);
}


/*
 * Delete the address from the endpoint local address list
 * Lookup using a sockaddr address (ie. not an ifaddr)
 */
int
sctp_del_local_addr_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa)
{
        struct sctp_laddr *laddr;
        struct sockaddr *l_sa;
        int found = 0;
        /* Here is another function I cannot find a
         * caller for. As such we SHOULD delete it
         * if we have no users. If we find a user that
         * user MUST have the INP locked.
         *
         */

        if (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                /* You are already bound to all. You have it already */
                return (EINVAL);
        }

        LIST_FOREACH(laddr, &inp->sctp_addr_list, sctp_nxt_addr) {
                /* make sure the address exists */
                if (laddr->ifa == NULL)
                        continue;
                if (laddr->ifa->ifa_addr == NULL)
                        continue;

                l_sa = laddr->ifa->ifa_addr;
                if (l_sa->sa_family == AF_INET6) {
                        /* IPv6 address */
                        struct sockaddr_in6 *sin1, *sin2;
                        sin1 = (struct sockaddr_in6 *)l_sa;
                        sin2 = (struct sockaddr_in6 *)sa;
                        if (memcmp(&sin1->sin6_addr, &sin2->sin6_addr,
                            sizeof(struct in6_addr)) == 0) {
                                /* matched */
                                found = 1;
                                break;
                        }
                } else if (l_sa->sa_family == AF_INET) {
                        /* IPv4 address */
                        struct sockaddr_in *sin1, *sin2;
                        sin1 = (struct sockaddr_in *)l_sa;
                        sin2 = (struct sockaddr_in *)sa;
                        if (sin1->sin_addr.s_addr == sin2->sin_addr.s_addr) {
                                /* matched */
                                found = 1;
                                break;
                        }
                } else {
                        /* invalid family */
                        return (-1);
                }
        }

        if (found && inp->laddr_count < 2) {
                /* can't delete unless there are at LEAST 2 addresses */
                return (-1);
        }

        if (found && (inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                /*
                 * remove it from the ep list, this should NOT be
                 * done until its really gone from the interface list and
                 * we won't be receiving more of these. Probably right
                 * away. If we do allow a removal of an address from
                 * an association (sub-set bind) than this should NOT
                 * be called until the all ASCONF come back from this
                 * association.
                 */
                sctp_remove_laddr(laddr);
                return (0);
        } else {
                return (-1);
        }
}

static void
sctp_drain_mbufs(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
        /*
         * We must hunt this association for MBUF's past the cumack
         * (i.e. out of order data that we can renege on).
         */
        struct sctp_association *asoc;
        struct sctp_tmit_chunk *chk, *nchk;
        u_int32_t cumulative_tsn_p1, tsn;
        int cnt, strmat, gap;
        /* We look for anything larger than the cum-ack + 1 */

        asoc = &stcb->asoc;
        cumulative_tsn_p1 = asoc->cumulative_tsn + 1;
        cnt = 0;
        /* First look in the re-assembly queue */
        chk = TAILQ_FIRST(&asoc->reasmqueue);
        while (chk) {
                /* Get the next one */
                nchk = TAILQ_NEXT(chk, sctp_next);
                if (compare_with_wrap(chk->rec.data.TSN_seq,
                    cumulative_tsn_p1, MAX_TSN)) {
                        /* Yep it is above cum-ack */
                        cnt++;
                        tsn = chk->rec.data.TSN_seq;
                        if (tsn >= asoc->mapping_array_base_tsn) {
                                gap  = tsn - asoc->mapping_array_base_tsn;
                        } else {
                                gap = (MAX_TSN - asoc->mapping_array_base_tsn) +
                                    tsn + 1;
                        }
                        asoc->size_on_reasm_queue -= chk->send_size;
                        asoc->cnt_on_reasm_queue--;
                        SCTP_UNSET_TSN_PRESENT(asoc->mapping_array, gap);
                        TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next);
                        sctp_m_freem(chk->data);
                        chk->data = 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 = nchk;
        }
        /* Ok that was fun, now we will drain all the inbound streams? */
        for (strmat = 0; strmat < asoc->streamincnt; strmat++) {
                chk = TAILQ_FIRST(&asoc->strmin[strmat].inqueue);
                while (chk) {
                        nchk = TAILQ_NEXT(chk, sctp_next);
                        if (compare_with_wrap(chk->rec.data.TSN_seq,
                            cumulative_tsn_p1, MAX_TSN)) {
                                /* Yep it is above cum-ack */
                                cnt++;
                                tsn = chk->rec.data.TSN_seq;
                                if (tsn >= asoc->mapping_array_base_tsn) {
                                        gap = tsn -
                                            asoc->mapping_array_base_tsn;
                                } else {
                                        gap = (MAX_TSN -
                                            asoc->mapping_array_base_tsn) +
                                            tsn + 1;
                                }
                                asoc->size_on_all_streams -= chk->send_size;
                                asoc->cnt_on_all_streams--;

                                SCTP_UNSET_TSN_PRESENT(asoc->mapping_array,
                                    gap);
                                TAILQ_REMOVE(&asoc->strmin[strmat].inqueue,
                                    chk, sctp_next);
                                sctp_m_freem(chk->data);
                                chk->data = 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 = nchk;
                }
        }
        /*
         * Question, should we go through the delivery queue?
         * The only reason things are on here is the app not reading OR a
         * p-d-api up. An attacker COULD send enough in to initiate the
         * PD-API and then send a bunch of stuff to other streams... these
         * would wind up on the delivery queue.. and then we would not get
         * to them. But in order to do this I then have to back-track and
         * un-deliver sequence numbers in streams.. el-yucko. I think for
         * now we will NOT look at the delivery queue and leave it to be
         * something to consider later. An alternative would be to abort
         * the P-D-API with a notification and then deliver the data....
         * Or another method might be to keep track of how many times the
         * situation occurs and if we see a possible attack underway just
         * abort the association.
         */
#ifdef SCTP_DEBUG
        if (sctp_debug_on & SCTP_DEBUG_PCB1) {
                if (cnt) {
                        printf("Freed %d chunks from reneg harvest\n", cnt);
                }
        }
#endif /* SCTP_DEBUG */

        /*
         * Another issue, in un-setting the TSN's in the mapping array we
         * DID NOT adjust the highest_tsn marker.  This will cause one of
         * two things to occur. It may cause us to do extra work in checking
         * for our mapping array movement. More importantly it may cause us
         * to SACK every datagram. This may not be a bad thing though since
         * we will recover once we get our cum-ack above and all this stuff
         * we dumped recovered.
         */
}

void
sctp_drain(void)
{
        /*
         * We must walk the PCB lists for ALL associations here. The system
         * is LOW on MBUF's and needs help. This is where reneging will
         * occur. We really hope this does NOT happen!
         */
        struct sctp_inpcb *inp;
        struct sctp_tcb *stcb;

        SCTP_INP_INFO_RLOCK();
        LIST_FOREACH(inp, &sctppcbinfo.listhead, sctp_list) {
                /* For each endpoint */
                SCTP_INP_RLOCK(inp);
                LIST_FOREACH(stcb, &inp->sctp_asoc_list, sctp_tcblist) {
                        /* For each association */
                        SCTP_TCB_LOCK(stcb);
                        sctp_drain_mbufs(inp, stcb);
                        SCTP_TCB_UNLOCK(stcb);
                }
                SCTP_INP_RUNLOCK(inp);
        }
        SCTP_INP_INFO_RUNLOCK();
}

int
sctp_add_to_socket_q(struct sctp_inpcb *inp, struct sctp_tcb *stcb)
{
        struct sctp_socket_q_list *sq;

        /* write lock on INP assumed */
        if ((inp == NULL) || (stcb == NULL)) {
                /* I am paranoid */
                return (0);
        }
        sq = (struct sctp_socket_q_list *)SCTP_ZONE_GET(
            sctppcbinfo.ipi_zone_sockq);
        if (sq == NULL) {
                /* out of sq structs */
                return (0);
        }
        sctppcbinfo.ipi_count_sockq++;
        sctppcbinfo.ipi_gencnt_sockq++;
        if (stcb)
                stcb->asoc.cnt_msg_on_sb++;
        sq->tcb = stcb;
        TAILQ_INSERT_TAIL(&inp->sctp_queue_list, sq, next_sq);
        return (1);
}


struct sctp_tcb *
sctp_remove_from_socket_q(struct sctp_inpcb *inp)
{
        struct sctp_tcb *stcb = NULL;
        struct sctp_socket_q_list *sq;

        /* W-Lock on INP assumed held */
        sq = TAILQ_FIRST(&inp->sctp_queue_list);
        if (sq == NULL)
                return (NULL);

        stcb = sq->tcb;
        TAILQ_REMOVE(&inp->sctp_queue_list, sq, next_sq);
        SCTP_ZONE_FREE(sctppcbinfo.ipi_zone_sockq, sq);
        sctppcbinfo.ipi_count_sockq--;
        sctppcbinfo.ipi_gencnt_sockq++;
        if (stcb) {
                stcb->asoc.cnt_msg_on_sb--;
        }
        return (stcb);
}

int
sctp_initiate_iterator(asoc_func af, uint32_t pcb_state, uint32_t asoc_state,
                       void *argp, uint32_t argi, end_func ef,
                       struct sctp_inpcb *s_inp)
{
        struct sctp_iterator *it=NULL;
        int s;
        if (af == NULL) {
                return (-1);
        }
        it = malloc(sizeof(struct sctp_iterator), M_PCB, M_WAITOK);
        if (it == NULL) {
                return (ENOMEM);
        }
        memset(it, 0, sizeof(*it));
        it->function_toapply = af;
        it->function_atend = ef;
        it->pointer = argp;
        it->val = argi;
        it->pcb_flags = pcb_state;
        it->asoc_state = asoc_state;
        if (s_inp) {
                it->inp = s_inp;
                it->iterator_flags = SCTP_ITERATOR_DO_SINGLE_INP;
        } else {
                SCTP_INP_INFO_RLOCK();
                it->inp = LIST_FIRST(&sctppcbinfo.listhead);
                SCTP_INP_INFO_RUNLOCK();
                it->iterator_flags = SCTP_ITERATOR_DO_ALL_INP;

        }
        /* Init the timer */
        callout_init(&it->tmr.timer, 0);
        /* add to the list of all iterators */
        SCTP_INP_INFO_WLOCK();
        LIST_INSERT_HEAD(&sctppcbinfo.iteratorhead, it, sctp_nxt_itr);
        SCTP_INP_INFO_WUNLOCK();
        s = splsoftnet();
        sctp_iterator_timer(it);
        splx(s);
        return (0);
}