Revert r361209:

[FreeBSD/FreeBSD.git] / sys / netinet / sctp_asconf.c

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * a) Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * b) Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *
 * c) Neither the name of Cisco Systems, Inc. nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

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

/*
 * debug flags:
 * SCTP_DEBUG_ASCONF1: protocol info, general info and errors
 * SCTP_DEBUG_ASCONF2: detailed info
 */


/*
 * RFC 5061
 *
 * An ASCONF parameter queue exists per asoc which holds the pending address
 * operations.  Lists are updated upon receipt of ASCONF-ACK.
 *
 * A restricted_addrs list exists per assoc to hold local addresses that are
 * not (yet) usable by the assoc as a source address.  These addresses are
 * either pending an ASCONF operation (and exist on the ASCONF parameter
 * queue), or they are permanently restricted (the peer has returned an
 * ERROR indication to an ASCONF(ADD), or the peer does not support ASCONF).
 *
 * Deleted addresses are always immediately removed from the lists as they will
 * (shortly) no longer exist in the kernel.  We send ASCONFs as a courtesy,
 * only if allowed.
 */

/*
 * ASCONF parameter processing.
 * response_required: set if a reply is required (eg. SUCCESS_REPORT).
 * returns a mbuf to an "error" response parameter or NULL/"success" if ok.
 * FIX: allocating this many mbufs on the fly is pretty inefficient...
 */
static struct mbuf *
sctp_asconf_success_response(uint32_t id)
{
        struct mbuf *m_reply = NULL;
        struct sctp_asconf_paramhdr *aph;

        m_reply = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_paramhdr),
            0, M_NOWAIT, 1, MT_DATA);
        if (m_reply == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "asconf_success_response: couldn't get mbuf!\n");
                return (NULL);
        }
        aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
        aph->correlation_id = id;
        aph->ph.param_type = htons(SCTP_SUCCESS_REPORT);
        aph->ph.param_length = sizeof(struct sctp_asconf_paramhdr);
        SCTP_BUF_LEN(m_reply) = aph->ph.param_length;
        aph->ph.param_length = htons(aph->ph.param_length);

        return (m_reply);
}

static struct mbuf *
sctp_asconf_error_response(uint32_t id, uint16_t cause, uint8_t *error_tlv,
    uint16_t tlv_length)
{
        struct mbuf *m_reply = NULL;
        struct sctp_asconf_paramhdr *aph;
        struct sctp_error_cause *error;
        uint32_t buf_len;
        uint16_t i, param_length, cause_length, padding_length;
        uint8_t *tlv;

        if (error_tlv == NULL) {
                tlv_length = 0;
        }
        cause_length = sizeof(struct sctp_error_cause) + tlv_length;
        param_length = sizeof(struct sctp_asconf_paramhdr) + cause_length;
        padding_length = tlv_length % 4;
        if (padding_length != 0) {
                padding_length = 4 - padding_length;
        }
        buf_len = param_length + padding_length;
        if (buf_len > MLEN) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "asconf_error_response: tlv_length (%xh) too big\n",
                    tlv_length);
                return (NULL);
        }
        m_reply = sctp_get_mbuf_for_msg(buf_len, 0, M_NOWAIT, 1, MT_DATA);
        if (m_reply == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "asconf_error_response: couldn't get mbuf!\n");
                return (NULL);
        }
        aph = mtod(m_reply, struct sctp_asconf_paramhdr *);
        aph->ph.param_type = htons(SCTP_ERROR_CAUSE_IND);
        aph->ph.param_length = htons(param_length);
        aph->correlation_id = id;
        error = (struct sctp_error_cause *)(aph + 1);
        error->code = htons(cause);
        error->length = htons(cause_length);
        if (error_tlv != NULL) {
                tlv = (uint8_t *)(error + 1);
                memcpy(tlv, error_tlv, tlv_length);
                for (i = 0; i < padding_length; i++) {
                        tlv[tlv_length + i] = 0;
                }
        }
        SCTP_BUF_LEN(m_reply) = buf_len;
        return (m_reply);
}

static struct mbuf *
sctp_process_asconf_add_ip(struct sockaddr *src, struct sctp_asconf_paramhdr *aph,
    struct sctp_tcb *stcb, int send_hb, int response_required)
{
        struct sctp_nets *net;
        struct mbuf *m_reply = NULL;
        union sctp_sockstore store;
        struct sctp_paramhdr *ph;
        uint16_t param_type, aparam_length;
#if defined(INET) || defined(INET6)
        uint16_t param_length;
#endif
        struct sockaddr *sa;
        int zero_address = 0;
        int bad_address = 0;
#ifdef INET
        struct sockaddr_in *sin;
        struct sctp_ipv4addr_param *v4addr;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
        struct sctp_ipv6addr_param *v6addr;
#endif

        aparam_length = ntohs(aph->ph.param_length);
        if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                return (NULL);
        }
        ph = (struct sctp_paramhdr *)(aph + 1);
        param_type = ntohs(ph->param_type);
#if defined(INET) || defined(INET6)
        param_length = ntohs(ph->param_length);
        if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                return (NULL);
        }
#endif
        sa = &store.sa;
        switch (param_type) {
#ifdef INET
        case SCTP_IPV4_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v4addr = (struct sctp_ipv4addr_param *)ph;
                sin = &store.sin;
                memset(sin, 0, sizeof(*sin));
                sin->sin_family = AF_INET;
                sin->sin_len = sizeof(struct sockaddr_in);
                sin->sin_port = stcb->rport;
                sin->sin_addr.s_addr = v4addr->addr;
                if ((sin->sin_addr.s_addr == INADDR_BROADCAST) ||
                    IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
                        bad_address = 1;
                }
                if (sin->sin_addr.s_addr == INADDR_ANY)
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
#ifdef INET6
        case SCTP_IPV6_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v6addr = (struct sctp_ipv6addr_param *)ph;
                sin6 = &store.sin6;
                memset(sin6, 0, sizeof(*sin6));
                sin6->sin6_family = AF_INET6;
                sin6->sin6_len = sizeof(struct sockaddr_in6);
                sin6->sin6_port = stcb->rport;
                memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
                    sizeof(struct in6_addr));
                if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
                        bad_address = 1;
                }
                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_add_ip: adding ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
        default:
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_INVALID_PARAM, (uint8_t *)aph,
                    aparam_length);
                return (m_reply);
        }                       /* end switch */

        /* if 0.0.0.0/::0, add the source address instead */
        if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                sa = src;
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_add_ip: using source addr ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
        }
        net = NULL;
        /* add the address */
        if (bad_address) {
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_INVALID_PARAM, (uint8_t *)aph,
                    aparam_length);
        } else if (sctp_add_remote_addr(stcb, sa, &net, stcb->asoc.port,
                    SCTP_DONOT_SETSCOPE,
            SCTP_ADDR_DYNAMIC_ADDED) != 0) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_add_ip: error adding address\n");
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_RESOURCE_SHORTAGE, (uint8_t *)aph,
                    aparam_length);
        } else {
                if (response_required) {
                        m_reply =
                            sctp_asconf_success_response(aph->correlation_id);
                }
                if (net != NULL) {
                        /* notify upper layer */
                        sctp_ulp_notify(SCTP_NOTIFY_ASCONF_ADD_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
                        sctp_timer_start(SCTP_TIMER_TYPE_PATHMTURAISE, stcb->sctp_ep, stcb, net);
                        sctp_timer_start(SCTP_TIMER_TYPE_HEARTBEAT, stcb->sctp_ep,
                            stcb, net);
                        if (send_hb) {
                                sctp_send_hb(stcb, net, SCTP_SO_NOT_LOCKED);
                        }
                }
        }
        return (m_reply);
}

static int
sctp_asconf_del_remote_addrs_except(struct sctp_tcb *stcb, struct sockaddr *src)
{
        struct sctp_nets *src_net, *net, *nnet;

        /* make sure the source address exists as a destination net */
        src_net = sctp_findnet(stcb, src);
        if (src_net == NULL) {
                /* not found */
                return (-1);
        }

        /* delete all destination addresses except the source */
        TAILQ_FOREACH_SAFE(net, &stcb->asoc.nets, sctp_next, nnet) {
                if (net != src_net) {
                        /* delete this address */
                        SCTPDBG(SCTP_DEBUG_ASCONF1,
                            "asconf_del_remote_addrs_except: deleting ");
                        SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1,
                            (struct sockaddr *)&net->ro._l_addr);
                        /* notify upper layer */
                        sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0,
                            (struct sockaddr *)&net->ro._l_addr, SCTP_SO_NOT_LOCKED);
                        sctp_remove_net(stcb, net);
                }
        }
        return (0);
}

static struct mbuf *
sctp_process_asconf_delete_ip(struct sockaddr *src,
    struct sctp_asconf_paramhdr *aph,
    struct sctp_tcb *stcb, int response_required)
{
        struct mbuf *m_reply = NULL;
        union sctp_sockstore store;
        struct sctp_paramhdr *ph;
        uint16_t param_type, aparam_length;
#if defined(INET) || defined(INET6)
        uint16_t param_length;
#endif
        struct sockaddr *sa;
        int zero_address = 0;
        int result;
#ifdef INET
        struct sockaddr_in *sin;
        struct sctp_ipv4addr_param *v4addr;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
        struct sctp_ipv6addr_param *v6addr;
#endif

        aparam_length = ntohs(aph->ph.param_length);
        if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                return (NULL);
        }
        ph = (struct sctp_paramhdr *)(aph + 1);
        param_type = ntohs(ph->param_type);
#if defined(INET) || defined(INET6)
        param_length = ntohs(ph->param_length);
        if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                return (NULL);
        }
#endif
        sa = &store.sa;
        switch (param_type) {
#ifdef INET
        case SCTP_IPV4_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v4addr = (struct sctp_ipv4addr_param *)ph;
                sin = &store.sin;
                memset(sin, 0, sizeof(*sin));
                sin->sin_family = AF_INET;
                sin->sin_len = sizeof(struct sockaddr_in);
                sin->sin_port = stcb->rport;
                sin->sin_addr.s_addr = v4addr->addr;
                if (sin->sin_addr.s_addr == INADDR_ANY)
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_delete_ip: deleting ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
#ifdef INET6
        case SCTP_IPV6_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v6addr = (struct sctp_ipv6addr_param *)ph;
                sin6 = &store.sin6;
                memset(sin6, 0, sizeof(*sin6));
                sin6->sin6_family = AF_INET6;
                sin6->sin6_len = sizeof(struct sockaddr_in6);
                sin6->sin6_port = stcb->rport;
                memcpy(&sin6->sin6_addr, v6addr->addr,
                    sizeof(struct in6_addr));
                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_delete_ip: deleting ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
        default:
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                    aparam_length);
                return (m_reply);
        }

        /* make sure the source address is not being deleted */
        if (sctp_cmpaddr(sa, src)) {
                /* trying to delete the source address! */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete source addr\n");
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_DELETING_SRC_ADDR, (uint8_t *)aph,
                    aparam_length);
                return (m_reply);
        }

        /* if deleting 0.0.0.0/::0, delete all addresses except src addr */
        if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                result = sctp_asconf_del_remote_addrs_except(stcb, src);

                if (result) {
                        /* src address did not exist? */
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: src addr does not exist?\n");
                        /* what error to reply with?? */
                        m_reply =
                            sctp_asconf_error_response(aph->correlation_id,
                            SCTP_CAUSE_REQUEST_REFUSED, (uint8_t *)aph,
                            aparam_length);
                } else if (response_required) {
                        m_reply =
                            sctp_asconf_success_response(aph->correlation_id);
                }
                return (m_reply);
        }

        /* delete the address */
        result = sctp_del_remote_addr(stcb, sa);
        /*
         * note if result == -2, the address doesn't exist in the asoc but
         * since it's being deleted anyways, we just ack the delete -- but
         * this probably means something has already gone awry
         */
        if (result == -1) {
                /* only one address in the asoc */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_delete_ip: tried to delete last IP addr!\n");
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_DELETING_LAST_ADDR, (uint8_t *)aph,
                    aparam_length);
        } else {
                if (response_required) {
                        m_reply = sctp_asconf_success_response(aph->correlation_id);
                }
                /* notify upper layer */
                sctp_ulp_notify(SCTP_NOTIFY_ASCONF_DELETE_IP, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
        }
        return (m_reply);
}

static struct mbuf *
sctp_process_asconf_set_primary(struct sockaddr *src,
    struct sctp_asconf_paramhdr *aph,
    struct sctp_tcb *stcb, int response_required)
{
        struct mbuf *m_reply = NULL;
        union sctp_sockstore store;
        struct sctp_paramhdr *ph;
        uint16_t param_type, aparam_length;
#if defined(INET) || defined(INET6)
        uint16_t param_length;
#endif
        struct sockaddr *sa;
        int zero_address = 0;
#ifdef INET
        struct sockaddr_in *sin;
        struct sctp_ipv4addr_param *v4addr;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
        struct sctp_ipv6addr_param *v6addr;
#endif

        aparam_length = ntohs(aph->ph.param_length);
        if (aparam_length < sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_paramhdr)) {
                return (NULL);
        }
        ph = (struct sctp_paramhdr *)(aph + 1);
        param_type = ntohs(ph->param_type);
#if defined(INET) || defined(INET6)
        param_length = ntohs(ph->param_length);
        if (param_length + sizeof(struct sctp_asconf_paramhdr) != aparam_length) {
                return (NULL);
        }
#endif
        sa = &store.sa;
        switch (param_type) {
#ifdef INET
        case SCTP_IPV4_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv4addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v4addr = (struct sctp_ipv4addr_param *)ph;
                sin = &store.sin;
                memset(sin, 0, sizeof(*sin));
                sin->sin_family = AF_INET;
                sin->sin_len = sizeof(struct sockaddr_in);
                sin->sin_addr.s_addr = v4addr->addr;
                if (sin->sin_addr.s_addr == INADDR_ANY)
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
#ifdef INET6
        case SCTP_IPV6_ADDRESS:
                if (param_length != sizeof(struct sctp_ipv6addr_param)) {
                        /* invalid param size */
                        return (NULL);
                }
                v6addr = (struct sctp_ipv6addr_param *)ph;
                sin6 = &store.sin6;
                memset(sin6, 0, sizeof(*sin6));
                sin6->sin6_family = AF_INET6;
                sin6->sin6_len = sizeof(struct sockaddr_in6);
                memcpy((caddr_t)&sin6->sin6_addr, v6addr->addr,
                    sizeof(struct in6_addr));
                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
                        zero_address = 1;
                SCTPDBG(SCTP_DEBUG_ASCONF1, "process_asconf_set_primary: ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                break;
#endif
        default:
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                    aparam_length);
                return (m_reply);
        }

        /* if 0.0.0.0/::0, use the source address instead */
        if (zero_address && SCTP_BASE_SYSCTL(sctp_nat_friendly)) {
                sa = src;
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_set_primary: using source addr ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
        }
        /* set the primary address */
        if (sctp_set_primary_addr(stcb, sa, NULL) == 0) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_set_primary: primary address set\n");
                /* notify upper layer */
                sctp_ulp_notify(SCTP_NOTIFY_ASCONF_SET_PRIMARY, stcb, 0, sa, SCTP_SO_NOT_LOCKED);
                if ((stcb->asoc.primary_destination->dest_state & SCTP_ADDR_REACHABLE) &&
                    (!(stcb->asoc.primary_destination->dest_state & SCTP_ADDR_PF)) &&
                    (stcb->asoc.alternate)) {
                        sctp_free_remote_addr(stcb->asoc.alternate);
                        stcb->asoc.alternate = NULL;
                }
                if (response_required) {
                        m_reply = sctp_asconf_success_response(aph->correlation_id);
                }
                /*
                 * Mobility adaptation. Ideally, when the reception of SET
                 * PRIMARY with DELETE IP ADDRESS of the previous primary
                 * destination, unacknowledged DATA are retransmitted
                 * immediately to the new primary destination for seamless
                 * handover. If the destination is UNCONFIRMED and marked to
                 * REQ_PRIM, The retransmission occur when reception of the
                 * HEARTBEAT-ACK.  (See sctp_handle_heartbeat_ack in
                 * sctp_input.c) Also, when change of the primary
                 * destination, it is better that all subsequent new DATA
                 * containing already queued DATA are transmitted to the new
                 * primary destination. (by micchie)
                 */
                if ((sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_BASE) ||
                    sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_FASTHANDOFF)) &&
                    sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_PRIM_DELETED) &&
                    (stcb->asoc.primary_destination->dest_state &
                    SCTP_ADDR_UNCONFIRMED) == 0) {

                        sctp_timer_stop(SCTP_TIMER_TYPE_PRIM_DELETED,
                            stcb->sctp_ep, stcb, NULL,
                            SCTP_FROM_SCTP_ASCONF + SCTP_LOC_1);
                        if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                            SCTP_MOBILITY_FASTHANDOFF)) {
                                sctp_assoc_immediate_retrans(stcb,
                                    stcb->asoc.primary_destination);
                        }
                        if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                            SCTP_MOBILITY_BASE)) {
                                sctp_move_chunks_from_net(stcb,
                                    stcb->asoc.deleted_primary);
                        }
                        sctp_delete_prim_timer(stcb->sctp_ep, stcb);
                }
        } else {
                /* couldn't set the requested primary address! */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_asconf_set_primary: set primary failed!\n");
                /* must have been an invalid address, so report */
                m_reply = sctp_asconf_error_response(aph->correlation_id,
                    SCTP_CAUSE_UNRESOLVABLE_ADDR, (uint8_t *)aph,
                    aparam_length);
        }

        return (m_reply);
}

/*
 * handles an ASCONF chunk.
 * if all parameters are processed ok, send a plain (empty) ASCONF-ACK
 */
void
sctp_handle_asconf(struct mbuf *m, unsigned int offset,
    struct sockaddr *src,
    struct sctp_asconf_chunk *cp, struct sctp_tcb *stcb,
    int first)
{
        struct sctp_association *asoc;
        uint32_t serial_num;
        struct mbuf *n, *m_ack, *m_result, *m_tail;
        struct sctp_asconf_ack_chunk *ack_cp;
        struct sctp_asconf_paramhdr *aph;
        struct sctp_ipv6addr_param *p_addr;
        unsigned int asconf_limit, cnt;
        int error = 0;          /* did an error occur? */

        /* asconf param buffer */
        uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
        struct sctp_asconf_ack *ack, *ack_next;

        /* verify minimum length */
        if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_chunk)) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "handle_asconf: chunk too small = %xh\n",
                    ntohs(cp->ch.chunk_length));
                return;
        }
        asoc = &stcb->asoc;
        serial_num = ntohl(cp->serial_number);

        if (SCTP_TSN_GE(asoc->asconf_seq_in, serial_num)) {
                /* got a duplicate ASCONF */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "handle_asconf: got duplicate serial number = %xh\n",
                    serial_num);
                return;
        } else if (serial_num != (asoc->asconf_seq_in + 1)) {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: incorrect serial number = %xh (expected next = %xh)\n",
                    serial_num, asoc->asconf_seq_in + 1);
                return;
        }

        /* it's the expected "next" sequence number, so process it */
        asoc->asconf_seq_in = serial_num;       /* update sequence */
        /* get length of all the param's in the ASCONF */
        asconf_limit = offset + ntohs(cp->ch.chunk_length);
        SCTPDBG(SCTP_DEBUG_ASCONF1,
            "handle_asconf: asconf_limit=%u, sequence=%xh\n",
            asconf_limit, serial_num);

        if (first) {
                /* delete old cache */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: Now processing first ASCONF. Try to delete old cache\n");

                TAILQ_FOREACH_SAFE(ack, &asoc->asconf_ack_sent, next, ack_next) {
                        if (ack->serial_number == serial_num)
                                break;
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: delete old(%u) < first(%u)\n",
                            ack->serial_number, serial_num);
                        TAILQ_REMOVE(&asoc->asconf_ack_sent, ack, next);
                        if (ack->data != NULL) {
                                sctp_m_freem(ack->data);
                        }
                        SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_asconf_ack), ack);
                }
        }

        m_ack = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_ack_chunk), 0,
            M_NOWAIT, 1, MT_DATA);
        if (m_ack == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "handle_asconf: couldn't get mbuf!\n");
                return;
        }
        m_tail = m_ack;         /* current reply chain's tail */

        /* fill in ASCONF-ACK header */
        ack_cp = mtod(m_ack, struct sctp_asconf_ack_chunk *);
        ack_cp->ch.chunk_type = SCTP_ASCONF_ACK;
        ack_cp->ch.chunk_flags = 0;
        ack_cp->serial_number = htonl(serial_num);
        /* set initial lengths (eg. just an ASCONF-ACK), ntohx at the end! */
        SCTP_BUF_LEN(m_ack) = sizeof(struct sctp_asconf_ack_chunk);
        ack_cp->ch.chunk_length = sizeof(struct sctp_asconf_ack_chunk);

        /* skip the lookup address parameter */
        offset += sizeof(struct sctp_asconf_chunk);
        p_addr = (struct sctp_ipv6addr_param *)sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr), (uint8_t *)&aparam_buf);
        if (p_addr == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "handle_asconf: couldn't get lookup addr!\n");
                /* respond with a missing/invalid mandatory parameter error */
                sctp_m_freem(m_ack);
                return;
        }
        /* skip lookup addr */
        offset += SCTP_SIZE32(ntohs(p_addr->ph.param_length));
        /* get pointer to first asconf param in ASCONF */
        aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, sizeof(struct sctp_asconf_paramhdr), (uint8_t *)&aparam_buf);
        if (aph == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "Empty ASCONF received?\n");
                goto send_reply;
        }
        /* process through all parameters */
        cnt = 0;
        while (aph != NULL) {
                unsigned int param_length, param_type;

                param_type = ntohs(aph->ph.param_type);
                param_length = ntohs(aph->ph.param_length);
                if (offset + param_length > asconf_limit) {
                        /* parameter goes beyond end of chunk! */
                        sctp_m_freem(m_ack);
                        return;
                }
                m_result = NULL;

                if (param_length > sizeof(aparam_buf)) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) larger than buffer size!\n", param_length);
                        sctp_m_freem(m_ack);
                        return;
                }
                if (param_length <= sizeof(struct sctp_paramhdr)) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: param length (%u) too short\n", param_length);
                        sctp_m_freem(m_ack);
                        return;
                }
                /* get the entire parameter */
                aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
                if (aph == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: couldn't get entire param\n");
                        sctp_m_freem(m_ack);
                        return;
                }
                switch (param_type) {
                case SCTP_ADD_IP_ADDRESS:
                        m_result = sctp_process_asconf_add_ip(src, aph, stcb,
                            (cnt < SCTP_BASE_SYSCTL(sctp_hb_maxburst)), error);
                        cnt++;
                        break;
                case SCTP_DEL_IP_ADDRESS:
                        m_result = sctp_process_asconf_delete_ip(src, aph, stcb,
                            error);
                        break;
                case SCTP_ERROR_CAUSE_IND:
                        /* not valid in an ASCONF chunk */
                        break;
                case SCTP_SET_PRIM_ADDR:
                        m_result = sctp_process_asconf_set_primary(src, aph,
                            stcb, error);
                        break;
                case SCTP_NAT_VTAGS:
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: sees a NAT VTAG state parameter\n");
                        break;
                case SCTP_SUCCESS_REPORT:
                        /* not valid in an ASCONF chunk */
                        break;
                case SCTP_ULP_ADAPTATION:
                        /* FIX */
                        break;
                default:
                        if ((param_type & 0x8000) == 0) {
                                /* Been told to STOP at this param */
                                asconf_limit = offset;
                                /*
                                 * FIX FIX - We need to call
                                 * sctp_arethere_unrecognized_parameters()
                                 * to get a operr and send it for any
                                 * param's with the 0x4000 bit set OR do it
                                 * here ourselves... note we still must STOP
                                 * if the 0x8000 bit is clear.
                                 */
                        }
                        /* unknown/invalid param type */
                        break;
                }               /* switch */

                /* add any (error) result to the reply mbuf chain */
                if (m_result != NULL) {
                        SCTP_BUF_NEXT(m_tail) = m_result;
                        m_tail = m_result;
                        ack_cp->ch.chunk_length += SCTP_BUF_LEN(m_result);
                        /* set flag to force success reports */
                        error = 1;
                }
                offset += SCTP_SIZE32(param_length);
                /* update remaining ASCONF message length to process */
                if (offset >= asconf_limit) {
                        /* no more data in the mbuf chain */
                        break;
                }
                /* get pointer to next asconf param */
                aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
                    sizeof(struct sctp_asconf_paramhdr),
                    (uint8_t *)&aparam_buf);
                if (aph == NULL) {
                        /* can't get an asconf paramhdr */
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: can't get asconf param hdr!\n");
                        /* FIX ME - add error here... */
                }
        }

send_reply:
        ack_cp->ch.chunk_length = htons(ack_cp->ch.chunk_length);
        /* save the ASCONF-ACK reply */
        ack = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_asconf_ack),
            struct sctp_asconf_ack);
        if (ack == NULL) {
                sctp_m_freem(m_ack);
                return;
        }
        ack->serial_number = serial_num;
        ack->last_sent_to = NULL;
        ack->data = m_ack;
        ack->len = 0;
        for (n = m_ack; n != NULL; n = SCTP_BUF_NEXT(n)) {
                ack->len += SCTP_BUF_LEN(n);
        }
        TAILQ_INSERT_TAIL(&stcb->asoc.asconf_ack_sent, ack, next);

        /* see if last_control_chunk_from is set properly (use IP src addr) */
        if (stcb->asoc.last_control_chunk_from == NULL) {
                /*
                 * this could happen if the source address was just newly
                 * added
                 */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: looking up net for IP source address\n");
                SCTPDBG(SCTP_DEBUG_ASCONF1, "Looking for IP source: ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, src);
                /* look up the from address */
                stcb->asoc.last_control_chunk_from = sctp_findnet(stcb, src);
#ifdef SCTP_DEBUG
                if (stcb->asoc.last_control_chunk_from == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf: IP source address not found?!\n");
                }
#endif
        }
}

/*
 * does the address match? returns 0 if not, 1 if so
 */
static uint32_t
sctp_asconf_addr_match(struct sctp_asconf_addr *aa, struct sockaddr *sa)
{
        switch (sa->sa_family) {
#ifdef INET6
        case AF_INET6:
                {
                        /* XXX scopeid */
                        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;

                        if ((aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) &&
                            (memcmp(&aa->ap.addrp.addr, &sin6->sin6_addr,
                            sizeof(struct in6_addr)) == 0)) {
                                return (1);
                        }
                        break;
                }
#endif
#ifdef INET
        case AF_INET:
                {
                        struct sockaddr_in *sin = (struct sockaddr_in *)sa;

                        if ((aa->ap.addrp.ph.param_type == SCTP_IPV4_ADDRESS) &&
                            (memcmp(&aa->ap.addrp.addr, &sin->sin_addr,
                            sizeof(struct in_addr)) == 0)) {
                                return (1);
                        }
                        break;
                }
#endif
        default:
                break;
        }
        return (0);
}

/*
 * does the address match? returns 0 if not, 1 if so
 */
static uint32_t
sctp_addr_match(struct sctp_paramhdr *ph, struct sockaddr *sa)
{
#if defined(INET) || defined(INET6)
        uint16_t param_type, param_length;

        param_type = ntohs(ph->param_type);
        param_length = ntohs(ph->param_length);
#endif
        switch (sa->sa_family) {
#ifdef INET6
        case AF_INET6:
                {
                        /* XXX scopeid */
                        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
                        struct sctp_ipv6addr_param *v6addr;

                        v6addr = (struct sctp_ipv6addr_param *)ph;
                        if ((param_type == SCTP_IPV6_ADDRESS) &&
                            (param_length == sizeof(struct sctp_ipv6addr_param)) &&
                            (memcmp(&v6addr->addr, &sin6->sin6_addr,
                            sizeof(struct in6_addr)) == 0)) {
                                return (1);
                        }
                        break;
                }
#endif
#ifdef INET
        case AF_INET:
                {
                        struct sockaddr_in *sin = (struct sockaddr_in *)sa;
                        struct sctp_ipv4addr_param *v4addr;

                        v4addr = (struct sctp_ipv4addr_param *)ph;
                        if ((param_type == SCTP_IPV4_ADDRESS) &&
                            (param_length == sizeof(struct sctp_ipv4addr_param)) &&
                            (memcmp(&v4addr->addr, &sin->sin_addr,
                            sizeof(struct in_addr)) == 0)) {
                                return (1);
                        }
                        break;
                }
#endif
        default:
                break;
        }
        return (0);
}

/*
 * Cleanup for non-responded/OP ERR'd ASCONF
 */
void
sctp_asconf_cleanup(struct sctp_tcb *stcb)
{
        /*
         * clear out any existing asconfs going out
         */
        sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, NULL,
            SCTP_FROM_SCTP_ASCONF + SCTP_LOC_2);
        stcb->asoc.asconf_seq_out_acked = stcb->asoc.asconf_seq_out;
        /* remove the old ASCONF on our outbound queue */
        sctp_toss_old_asconf(stcb);
}

/*
 * cleanup any cached source addresses that may be topologically
 * incorrect after a new address has been added to this interface.
 */
static void
sctp_asconf_nets_cleanup(struct sctp_tcb *stcb, struct sctp_ifn *ifn)
{
        struct sctp_nets *net;

        /*
         * Ideally, we want to only clear cached routes and source addresses
         * that are topologically incorrect.  But since there is no easy way
         * to know whether the newly added address on the ifn would cause a
         * routing change (i.e. a new egress interface would be chosen)
         * without doing a new routing lookup and source address selection,
         * we will (for now) just flush any cached route using a different
         * ifn (and cached source addrs) and let output re-choose them
         * during the next send on that net.
         */
        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                /*
                 * clear any cached route (and cached source address) if the
                 * route's interface is NOT the same as the address change.
                 * If it's the same interface, just clear the cached source
                 * address.
                 */
                if (SCTP_ROUTE_HAS_VALID_IFN(&net->ro) &&
                    ((ifn == NULL) ||
                    (SCTP_GET_IF_INDEX_FROM_ROUTE(&net->ro) != ifn->ifn_index))) {
                        /* clear any cached route */
                        RO_NHFREE(&net->ro);
                }
                /* clear any cached source address */
                if (net->src_addr_selected) {
                        sctp_free_ifa(net->ro._s_addr);
                        net->ro._s_addr = NULL;
                        net->src_addr_selected = 0;
                }
        }
}


void
sctp_assoc_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *dstnet)
{
        int error;

        if (dstnet->dest_state & SCTP_ADDR_UNCONFIRMED) {
                return;
        }
        if (stcb->asoc.deleted_primary == NULL) {
                return;
        }

        if (!TAILQ_EMPTY(&stcb->asoc.sent_queue)) {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "assoc_immediate_retrans: Deleted primary is ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.deleted_primary->ro._l_addr.sa);
                SCTPDBG(SCTP_DEBUG_ASCONF1, "Current Primary is ");
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, &stcb->asoc.primary_destination->ro._l_addr.sa);
                sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb,
                    stcb->asoc.deleted_primary,
                    SCTP_FROM_SCTP_ASCONF + SCTP_LOC_3);
                stcb->asoc.num_send_timers_up--;
                if (stcb->asoc.num_send_timers_up < 0) {
                        stcb->asoc.num_send_timers_up = 0;
                }
                SCTP_TCB_LOCK_ASSERT(stcb);
                error = sctp_t3rxt_timer(stcb->sctp_ep, stcb,
                    stcb->asoc.deleted_primary);
                if (error) {
                        SCTP_INP_DECR_REF(stcb->sctp_ep);
                        return;
                }
                SCTP_TCB_LOCK_ASSERT(stcb);
#ifdef SCTP_AUDITING_ENABLED
                sctp_auditing(4, stcb->sctp_ep, stcb, stcb->asoc.deleted_primary);
#endif
                sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
                if ((stcb->asoc.num_send_timers_up == 0) &&
                    (stcb->asoc.sent_queue_cnt > 0)) {
                        struct sctp_tmit_chunk *chk;

                        TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                                if (chk->whoTo != NULL) {
                                        break;
                                }
                        }
                        if (chk != NULL) {
                                sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, chk->whoTo);
                        }
                }
        }
        return;
}

static int
    sctp_asconf_queue_mgmt(struct sctp_tcb *, struct sctp_ifa *, uint16_t);

void
sctp_net_immediate_retrans(struct sctp_tcb *stcb, struct sctp_nets *net)
{
        struct sctp_tmit_chunk *chk;

        SCTPDBG(SCTP_DEBUG_ASCONF1, "net_immediate_retrans: RTO is %d\n", net->RTO);
        sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net,
            SCTP_FROM_SCTP_ASCONF + SCTP_LOC_4);
        stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
        net->error_count = 0;
        TAILQ_FOREACH(chk, &stcb->asoc.sent_queue, sctp_next) {
                if (chk->whoTo == net) {
                        if (chk->sent < SCTP_DATAGRAM_RESEND) {
                                chk->sent = SCTP_DATAGRAM_RESEND;
                                sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt);
                                sctp_flight_size_decrease(chk);
                                sctp_total_flight_decrease(stcb, chk);
                                net->marked_retrans++;
                                stcb->asoc.marked_retrans++;
                        }
                }
        }
        if (net->marked_retrans) {
                sctp_chunk_output(stcb->sctp_ep, stcb, SCTP_OUTPUT_FROM_T3, SCTP_SO_NOT_LOCKED);
        }
}

static void
sctp_path_check_and_react(struct sctp_tcb *stcb, struct sctp_ifa *newifa)
{
        struct sctp_nets *net;
        int addrnum, changed;

        /*
         * If number of local valid addresses is 1, the valid address is
         * probably newly added address. Several valid addresses in this
         * association.  A source address may not be changed.  Additionally,
         * they can be configured on a same interface as "alias" addresses.
         * (by micchie)
         */
        addrnum = sctp_local_addr_count(stcb);
        SCTPDBG(SCTP_DEBUG_ASCONF1, "p_check_react(): %d local addresses\n",
            addrnum);
        if (addrnum == 1) {
                TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                        /* clear any cached route and source address */
                        RO_NHFREE(&net->ro);
                        if (net->src_addr_selected) {
                                sctp_free_ifa(net->ro._s_addr);
                                net->ro._s_addr = NULL;
                                net->src_addr_selected = 0;
                        }
                        /* Retransmit unacknowledged DATA chunks immediately */
                        if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                            SCTP_MOBILITY_FASTHANDOFF)) {
                                sctp_net_immediate_retrans(stcb, net);
                        }
                        /* also, SET PRIMARY is maybe already sent */
                }
                return;
        }

        /* Multiple local addresses exsist in the association.  */
        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                /* clear any cached route and source address */
                RO_NHFREE(&net->ro);
                if (net->src_addr_selected) {
                        sctp_free_ifa(net->ro._s_addr);
                        net->ro._s_addr = NULL;
                        net->src_addr_selected = 0;
                }
                /*
                 * Check if the nexthop is corresponding to the new address.
                 * If the new address is corresponding to the current
                 * nexthop, the path will be changed. If the new address is
                 * NOT corresponding to the current nexthop, the path will
                 * not be changed.
                 */
                SCTP_RTALLOC((sctp_route_t *)&net->ro,
                    stcb->sctp_ep->def_vrf_id,
                    stcb->sctp_ep->fibnum);
                if (net->ro.ro_nh == NULL)
                        continue;

                changed = 0;
                switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
                case AF_INET:
                        if (sctp_v4src_match_nexthop(newifa, (sctp_route_t *)&net->ro)) {
                                changed = 1;
                        }
                        break;
#endif
#ifdef INET6
                case AF_INET6:
                        if (sctp_v6src_match_nexthop(
                            &newifa->address.sin6, (sctp_route_t *)&net->ro)) {
                                changed = 1;
                        }
                        break;
#endif
                default:
                        break;
                }
                /*
                 * if the newly added address does not relate routing
                 * information, we skip.
                 */
                if (changed == 0)
                        continue;
                /* Retransmit unacknowledged DATA chunks immediately */
                if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_FASTHANDOFF)) {
                        sctp_net_immediate_retrans(stcb, net);
                }
                /* Send SET PRIMARY for this new address */
                if (net == stcb->asoc.primary_destination) {
                        (void)sctp_asconf_queue_mgmt(stcb, newifa,
                            SCTP_SET_PRIM_ADDR);
                }
        }
}

/*
 * process an ADD/DELETE IP ack from peer.
 * addr: corresponding sctp_ifa to the address being added/deleted.
 * type: SCTP_ADD_IP_ADDRESS or SCTP_DEL_IP_ADDRESS.
 * flag: 1=success, 0=failure.
 */
static void
sctp_asconf_addr_mgmt_ack(struct sctp_tcb *stcb, struct sctp_ifa *addr, uint32_t flag)
{
        /*
         * do the necessary asoc list work- if we get a failure indication,
         * leave the address on the assoc's restricted list.  If we get a
         * success indication, remove the address from the restricted list.
         */
        /*
         * Note: this will only occur for ADD_IP_ADDRESS, since
         * DEL_IP_ADDRESS is never actually added to the list...
         */
        if (flag) {
                /* success case, so remove from the restricted list */
                sctp_del_local_addr_restricted(stcb, addr);

                if (sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_BASE) ||
                    sctp_is_mobility_feature_on(stcb->sctp_ep,
                    SCTP_MOBILITY_FASTHANDOFF)) {
                        sctp_path_check_and_react(stcb, addr);
                        return;
                }
                /* clear any cached/topologically incorrect source addresses */
                sctp_asconf_nets_cleanup(stcb, addr->ifn_p);
        }
        /* else, leave it on the list */
}

/*
 * add an asconf add/delete/set primary IP address parameter to the queue.
 * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
 * returns 0 if queued, -1 if not queued/removed.
 * NOTE: if adding, but a delete for the same address is already scheduled
 * (and not yet sent out), simply remove it from queue.  Same for deleting
 * an address already scheduled for add.  If a duplicate operation is found,
 * ignore the new one.
 */
static int
sctp_asconf_queue_mgmt(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
    uint16_t type)
{
        struct sctp_asconf_addr *aa, *aa_next;

        /* make sure the request isn't already in the queue */
        TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                /* address match? */
                if (sctp_asconf_addr_match(aa, &ifa->address.sa) == 0)
                        continue;
                /*
                 * is the request already in queue but not sent? pass the
                 * request already sent in order to resolve the following
                 * case: 1. arrival of ADD, then sent 2. arrival of DEL. we
                 * can't remove the ADD request already sent 3. arrival of
                 * ADD
                 */
                if (aa->ap.aph.ph.param_type == type && aa->sent == 0) {
                        return (-1);
                }
                /* is the negative request already in queue, and not sent */
                if ((aa->sent == 0) && (type == SCTP_ADD_IP_ADDRESS) &&
                    (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS)) {
                        /* add requested, delete already queued */
                        TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                        /* remove the ifa from the restricted list */
                        sctp_del_local_addr_restricted(stcb, ifa);
                        /* free the asconf param */
                        SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                        SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: add removes queued entry\n");
                        return (-1);
                }
                if ((aa->sent == 0) && (type == SCTP_DEL_IP_ADDRESS) &&
                    (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS)) {
                        /* delete requested, add already queued */
                        TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                        /* remove the aa->ifa from the restricted list */
                        sctp_del_local_addr_restricted(stcb, aa->ifa);
                        /* free the asconf param */
                        SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                        SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_mgmt: delete removes queued entry\n");
                        return (-1);
                }
        }                       /* for each aa */

        /* adding new request to the queue */
        SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
            SCTP_M_ASC_ADDR);
        if (aa == NULL) {
                /* didn't get memory */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "asconf_queue_mgmt: failed to get memory!\n");
                return (-1);
        }
        aa->special_del = 0;
        /* fill in asconf address parameter fields */
        /* top level elements are "networked" during send */
        aa->ap.aph.ph.param_type = type;
        aa->ifa = ifa;
        atomic_add_int(&ifa->refcount, 1);
        /* correlation_id filled in during send routine later... */
        switch (ifa->address.sa.sa_family) {
#ifdef INET6
        case AF_INET6:
                {
                        struct sockaddr_in6 *sin6;

                        sin6 = &ifa->address.sin6;
                        aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                        aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
                        aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
                            sizeof(struct sctp_ipv6addr_param);
                        memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
                            sizeof(struct in6_addr));
                        break;
                }
#endif
#ifdef INET
        case AF_INET:
                {
                        struct sockaddr_in *sin;

                        sin = &ifa->address.sin;
                        aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                        aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
                        aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) +
                            sizeof(struct sctp_ipv4addr_param);
                        memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
                            sizeof(struct in_addr));
                        break;
                }
#endif
        default:
                /* invalid family! */
                SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                sctp_free_ifa(ifa);
                return (-1);
        }
        aa->sent = 0;           /* clear sent flag */

        TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
#ifdef SCTP_DEBUG
        if (SCTP_BASE_SYSCTL(sctp_debug_on) & SCTP_DEBUG_ASCONF2) {
                if (type == SCTP_ADD_IP_ADDRESS) {
                        SCTP_PRINTF("asconf_queue_mgmt: inserted asconf ADD_IP_ADDRESS: ");
                        SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                } else if (type == SCTP_DEL_IP_ADDRESS) {
                        SCTP_PRINTF("asconf_queue_mgmt: appended asconf DEL_IP_ADDRESS: ");
                        SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                } else {
                        SCTP_PRINTF("asconf_queue_mgmt: appended asconf SET_PRIM_ADDR: ");
                        SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, &ifa->address.sa);
                }
        }
#endif

        return (0);
}


/*
 * add an asconf operation for the given ifa and type.
 * type = SCTP_ADD_IP_ADDRESS, SCTP_DEL_IP_ADDRESS, SCTP_SET_PRIM_ADDR.
 * returns 0 if completed, -1 if not completed, 1 if immediate send is
 * advisable.
 */
static int
sctp_asconf_queue_add(struct sctp_tcb *stcb, struct sctp_ifa *ifa,
    uint16_t type)
{
        uint32_t status;
        int pending_delete_queued = 0;
        int last;

        /* see if peer supports ASCONF */
        if (stcb->asoc.asconf_supported == 0) {
                return (-1);
        }

        /*
         * if this is deleting the last address from the assoc, mark it as
         * pending.
         */
        if ((type == SCTP_DEL_IP_ADDRESS) && !stcb->asoc.asconf_del_pending) {
                if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                        last = (sctp_local_addr_count(stcb) == 0);
                } else {
                        last = (sctp_local_addr_count(stcb) == 1);
                }
                if (last) {
                        /* set the pending delete info only */
                        stcb->asoc.asconf_del_pending = 1;
                        stcb->asoc.asconf_addr_del_pending = ifa;
                        atomic_add_int(&ifa->refcount, 1);
                        SCTPDBG(SCTP_DEBUG_ASCONF2,
                            "asconf_queue_add: mark delete last address pending\n");
                        return (-1);
                }
        }

        /* queue an asconf parameter */
        status = sctp_asconf_queue_mgmt(stcb, ifa, type);

        /*
         * if this is an add, and there is a delete also pending (i.e. the
         * last local address is being changed), queue the pending delete
         * too.
         */
        if ((type == SCTP_ADD_IP_ADDRESS) && stcb->asoc.asconf_del_pending && (status == 0)) {
                /* queue in the pending delete */
                if (sctp_asconf_queue_mgmt(stcb,
                    stcb->asoc.asconf_addr_del_pending,
                    SCTP_DEL_IP_ADDRESS) == 0) {
                        SCTPDBG(SCTP_DEBUG_ASCONF2, "asconf_queue_add: queuing pending delete\n");
                        pending_delete_queued = 1;
                        /* clear out the pending delete info */
                        stcb->asoc.asconf_del_pending = 0;
                        sctp_free_ifa(stcb->asoc.asconf_addr_del_pending);
                        stcb->asoc.asconf_addr_del_pending = NULL;
                }
        }

        if (pending_delete_queued) {
                struct sctp_nets *net;

                /*
                 * since we know that the only/last address is now being
                 * changed in this case, reset the cwnd/rto on all nets to
                 * start as a new address and path.  Also clear the error
                 * counts to give the assoc the best chance to complete the
                 * address change.
                 */
                TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                        stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb,
                            net);
                        net->RTO = 0;
                        net->error_count = 0;
                }
                stcb->asoc.overall_error_count = 0;
                if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) {
                        sctp_misc_ints(SCTP_THRESHOLD_CLEAR,
                            stcb->asoc.overall_error_count,
                            0,
                            SCTP_FROM_SCTP_ASCONF,
                            __LINE__);
                }

                /* queue in an advisory set primary too */
                (void)sctp_asconf_queue_mgmt(stcb, ifa, SCTP_SET_PRIM_ADDR);
                /* let caller know we should send this out immediately */
                status = 1;
        }
        return (status);
}

/*-
 * add an asconf delete IP address parameter to the queue by sockaddr and
 * possibly with no sctp_ifa available.  This is only called by the routine
 * that checks the addresses in an INIT-ACK against the current address list.
 * returns 0 if completed, non-zero if not completed.
 * NOTE: if an add is already scheduled (and not yet sent out), simply
 * remove it from queue.  If a duplicate operation is found, ignore the
 * new one.
 */
static int
sctp_asconf_queue_sa_delete(struct sctp_tcb *stcb, struct sockaddr *sa)
{
        struct sctp_ifa *ifa;
        struct sctp_asconf_addr *aa, *aa_next;

        if (stcb == NULL) {
                return (-1);
        }
        /* see if peer supports ASCONF */
        if (stcb->asoc.asconf_supported == 0) {
                return (-1);
        }
        /* make sure the request isn't already in the queue */
        TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                /* address match? */
                if (sctp_asconf_addr_match(aa, sa) == 0)
                        continue;
                /* is the request already in queue (sent or not) */
                if (aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
                        return (-1);
                }
                /* is the negative request already in queue, and not sent */
                if (aa->sent == 1)
                        continue;
                if (aa->ap.aph.ph.param_type == SCTP_ADD_IP_ADDRESS) {
                        /* add already queued, so remove existing entry */
                        TAILQ_REMOVE(&stcb->asoc.asconf_queue, aa, next);
                        sctp_del_local_addr_restricted(stcb, aa->ifa);
                        /* free the entry */
                        SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                        return (-1);
                }
        }                       /* for each aa */

        /* find any existing ifa-- NOTE ifa CAN be allowed to be NULL */
        ifa = sctp_find_ifa_by_addr(sa, stcb->asoc.vrf_id, SCTP_ADDR_NOT_LOCKED);

        /* adding new request to the queue */
        SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
            SCTP_M_ASC_ADDR);
        if (aa == NULL) {
                /* didn't get memory */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_queue_sa_delete: failed to get memory!\n");
                return (-1);
        }
        aa->special_del = 0;
        /* fill in asconf address parameter fields */
        /* top level elements are "networked" during send */
        aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
        aa->ifa = ifa;
        if (ifa)
                atomic_add_int(&ifa->refcount, 1);
        /* correlation_id filled in during send routine later... */
        switch (sa->sa_family) {
#ifdef INET6
        case AF_INET6:
                {
                        /* IPv6 address */
                        struct sockaddr_in6 *sin6;

                        sin6 = (struct sockaddr_in6 *)sa;
                        aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                        aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv6addr_param));
                        aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv6addr_param);
                        memcpy(&aa->ap.addrp.addr, &sin6->sin6_addr,
                            sizeof(struct in6_addr));
                        break;
                }
#endif
#ifdef INET
        case AF_INET:
                {
                        /* IPv4 address */
                        struct sockaddr_in *sin = (struct sockaddr_in *)sa;

                        aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                        aa->ap.addrp.ph.param_length = (sizeof(struct sctp_ipv4addr_param));
                        aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_paramhdr) + sizeof(struct sctp_ipv4addr_param);
                        memcpy(&aa->ap.addrp.addr, &sin->sin_addr,
                            sizeof(struct in_addr));
                        break;
                }
#endif
        default:
                /* invalid family! */
                SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                if (ifa)
                        sctp_free_ifa(ifa);
                return (-1);
        }
        aa->sent = 0;           /* clear sent flag */

        /* delete goes to the back of the queue */
        TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);

        /* sa_ignore MEMLEAK {memory is put on the tailq} */
        return (0);
}

/*
 * find a specific asconf param on our "sent" queue
 */
static struct sctp_asconf_addr *
sctp_asconf_find_param(struct sctp_tcb *stcb, uint32_t correlation_id)
{
        struct sctp_asconf_addr *aa;

        TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                if (aa->ap.aph.correlation_id == correlation_id &&
                    aa->sent == 1) {
                        /* found it */
                        return (aa);
                }
        }
        /* didn't find it */
        return (NULL);
}

/*
 * process an SCTP_ERROR_CAUSE_IND for a ASCONF-ACK parameter and do
 * notifications based on the error response
 */
static void
sctp_asconf_process_error(struct sctp_tcb *stcb SCTP_UNUSED,
    struct sctp_asconf_paramhdr *aph)
{
        struct sctp_error_cause *eh;
        struct sctp_paramhdr *ph;
        uint16_t param_type;
        uint16_t error_code;

        eh = (struct sctp_error_cause *)(aph + 1);
        ph = (struct sctp_paramhdr *)(eh + 1);
        /* validate lengths */
        if (htons(eh->length) + sizeof(struct sctp_error_cause) >
            htons(aph->ph.param_length)) {
                /* invalid error cause length */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "asconf_process_error: cause element too long\n");
                return;
        }
        if (htons(ph->param_length) + sizeof(struct sctp_paramhdr) >
            htons(eh->length)) {
                /* invalid included TLV length */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "asconf_process_error: included TLV too long\n");
                return;
        }
        /* which error code ? */
        error_code = ntohs(eh->code);
        param_type = ntohs(aph->ph.param_type);
        /* FIX: this should go back up the REMOTE_ERROR ULP notify */
        switch (error_code) {
        case SCTP_CAUSE_RESOURCE_SHORTAGE:
                /* we allow ourselves to "try again" for this error */
                break;
        default:
                /* peer can't handle it... */
                switch (param_type) {
                case SCTP_ADD_IP_ADDRESS:
                case SCTP_DEL_IP_ADDRESS:
                case SCTP_SET_PRIM_ADDR:
                        break;
                default:
                        break;
                }
        }
}

/*
 * process an asconf queue param.
 * aparam: parameter to process, will be removed from the queue.
 * flag: 1=success case, 0=failure case
 */
static void
sctp_asconf_process_param_ack(struct sctp_tcb *stcb,
    struct sctp_asconf_addr *aparam, uint32_t flag)
{
        uint16_t param_type;

        /* process this param */
        param_type = aparam->ap.aph.ph.param_type;
        switch (param_type) {
        case SCTP_ADD_IP_ADDRESS:
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_param_ack: added IP address\n");
                sctp_asconf_addr_mgmt_ack(stcb, aparam->ifa, flag);
                break;
        case SCTP_DEL_IP_ADDRESS:
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_param_ack: deleted IP address\n");
                /* nothing really to do... lists already updated */
                break;
        case SCTP_SET_PRIM_ADDR:
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "process_param_ack: set primary IP address\n");
                /* nothing to do... peer may start using this addr */
                break;
        default:
                /* should NEVER happen */
                break;
        }

        /* remove the param and free it */
        TAILQ_REMOVE(&stcb->asoc.asconf_queue, aparam, next);
        if (aparam->ifa)
                sctp_free_ifa(aparam->ifa);
        SCTP_FREE(aparam, SCTP_M_ASC_ADDR);
}

/*
 * cleanup from a bad asconf ack parameter
 */
static void
sctp_asconf_ack_clear(struct sctp_tcb *stcb SCTP_UNUSED)
{
        /* assume peer doesn't really know how to do asconfs */
        /* XXX we could free the pending queue here */

}

void
sctp_handle_asconf_ack(struct mbuf *m, int offset,
    struct sctp_asconf_ack_chunk *cp, struct sctp_tcb *stcb,
    struct sctp_nets *net, int *abort_no_unlock)
{
        struct sctp_association *asoc;
        uint32_t serial_num;
        uint16_t ack_length;
        struct sctp_asconf_paramhdr *aph;
        struct sctp_asconf_addr *aa, *aa_next;
        uint32_t last_error_id = 0;     /* last error correlation id */
        uint32_t id;
        struct sctp_asconf_addr *ap;

        /* asconf param buffer */
        uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];

        /* verify minimum length */
        if (ntohs(cp->ch.chunk_length) < sizeof(struct sctp_asconf_ack_chunk)) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "handle_asconf_ack: chunk too small = %xh\n",
                    ntohs(cp->ch.chunk_length));
                return;
        }
        asoc = &stcb->asoc;
        serial_num = ntohl(cp->serial_number);

        /*
         * NOTE: we may want to handle this differently- currently, we will
         * abort when we get an ack for the expected serial number + 1 (eg.
         * we didn't send it), process an ack normally if it is the expected
         * serial number, and re-send the previous ack for *ALL* other
         * serial numbers
         */

        /*
         * if the serial number is the next expected, but I didn't send it,
         * abort the asoc, since someone probably just hijacked us...
         */
        if (serial_num == (asoc->asconf_seq_out + 1)) {
                struct mbuf *op_err;
                char msg[SCTP_DIAG_INFO_LEN];

                SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got unexpected next serial number! Aborting asoc!\n");
                snprintf(msg, sizeof(msg), "Never sent serial number %8.8x",
                    serial_num);
                op_err = sctp_generate_cause(SCTP_CAUSE_PROTOCOL_VIOLATION, msg);
                sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
                *abort_no_unlock = 1;
                return;
        }
        if (serial_num != asoc->asconf_seq_out_acked + 1) {
                /* got a duplicate/unexpected ASCONF-ACK */
                SCTPDBG(SCTP_DEBUG_ASCONF1, "handle_asconf_ack: got duplicate/unexpected serial number = %xh (expected = %xh)\n",
                    serial_num, asoc->asconf_seq_out_acked + 1);
                return;
        }

        if (serial_num == asoc->asconf_seq_out - 1) {
                /* stop our timer */
                sctp_timer_stop(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep, stcb, NULL,
                    SCTP_FROM_SCTP_ASCONF + SCTP_LOC_5);
        }

        /* process the ASCONF-ACK contents */
        ack_length = ntohs(cp->ch.chunk_length) -
            sizeof(struct sctp_asconf_ack_chunk);
        offset += sizeof(struct sctp_asconf_ack_chunk);
        /* process through all parameters */
        while (ack_length >= sizeof(struct sctp_asconf_paramhdr)) {
                unsigned int param_length, param_type;

                /* get pointer to next asconf parameter */
                aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset,
                    sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                if (aph == NULL) {
                        /* can't get an asconf paramhdr */
                        sctp_asconf_ack_clear(stcb);
                        return;
                }
                param_type = ntohs(aph->ph.param_type);
                param_length = ntohs(aph->ph.param_length);
                if (param_length > ack_length) {
                        sctp_asconf_ack_clear(stcb);
                        return;
                }
                if (param_length < sizeof(struct sctp_paramhdr)) {
                        sctp_asconf_ack_clear(stcb);
                        return;
                }
                /* get the complete parameter... */
                if (param_length > sizeof(aparam_buf)) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1,
                            "param length (%u) larger than buffer size!\n", param_length);
                        sctp_asconf_ack_clear(stcb);
                        return;
                }
                aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(m, offset, param_length, aparam_buf);
                if (aph == NULL) {
                        sctp_asconf_ack_clear(stcb);
                        return;
                }
                /* correlation_id is transparent to peer, no ntohl needed */
                id = aph->correlation_id;

                switch (param_type) {
                case SCTP_ERROR_CAUSE_IND:
                        last_error_id = id;
                        /* find the corresponding asconf param in our queue */
                        ap = sctp_asconf_find_param(stcb, id);
                        if (ap == NULL) {
                                /* hmm... can't find this in our queue! */
                                break;
                        }
                        /* process the parameter, failed flag */
                        sctp_asconf_process_param_ack(stcb, ap, 0);
                        /* process the error response */
                        sctp_asconf_process_error(stcb, aph);
                        break;
                case SCTP_SUCCESS_REPORT:
                        /* find the corresponding asconf param in our queue */
                        ap = sctp_asconf_find_param(stcb, id);
                        if (ap == NULL) {
                                /* hmm... can't find this in our queue! */
                                break;
                        }
                        /* process the parameter, success flag */
                        sctp_asconf_process_param_ack(stcb, ap, 1);
                        break;
                default:
                        break;
                }               /* switch */

                /* update remaining ASCONF-ACK message length to process */
                if (ack_length > SCTP_SIZE32(param_length)) {
                        ack_length -= SCTP_SIZE32(param_length);
                } else {
                        break;
                }
                offset += SCTP_SIZE32(param_length);
        }                       /* while */

        /*
         * if there are any "sent" params still on the queue, these are
         * implicitly "success", or "failed" (if we got an error back) ...
         * so process these appropriately
         *
         * we assume that the correlation_id's are monotonically increasing
         * beginning from 1 and that we don't have *that* many outstanding
         * at any given time
         */
        if (last_error_id == 0)
                last_error_id--;        /* set to "max" value */
        TAILQ_FOREACH_SAFE(aa, &stcb->asoc.asconf_queue, next, aa_next) {
                if (aa->sent == 1) {
                        /*
                         * implicitly successful or failed if correlation_id
                         * < last_error_id, then success else, failure
                         */
                        if (aa->ap.aph.correlation_id < last_error_id)
                                sctp_asconf_process_param_ack(stcb, aa, 1);
                        else
                                sctp_asconf_process_param_ack(stcb, aa, 0);
                } else {
                        /*
                         * since we always process in order (FIFO queue) if
                         * we reach one that hasn't been sent, the rest
                         * should not have been sent either. so, we're
                         * done...
                         */
                        break;
                }
        }

        /* update the next sequence number to use */
        asoc->asconf_seq_out_acked++;
        /* remove the old ASCONF on our outbound queue */
        sctp_toss_old_asconf(stcb);
        if (!TAILQ_EMPTY(&stcb->asoc.asconf_queue)) {
#ifdef SCTP_TIMER_BASED_ASCONF
                /* we have more params, so restart our timer */
                sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, stcb->sctp_ep,
                    stcb, net);
#else
                /* we have more params, so send out more */
                sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
#endif
        }
}

#ifdef INET6
static uint32_t
sctp_is_scopeid_in_nets(struct sctp_tcb *stcb, struct sockaddr *sa)
{
        struct sockaddr_in6 *sin6, *net6;
        struct sctp_nets *net;

        if (sa->sa_family != AF_INET6) {
                /* wrong family */
                return (0);
        }
        sin6 = (struct sockaddr_in6 *)sa;
        if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) == 0) {
                /* not link local address */
                return (0);
        }
        /* hunt through our destination nets list for this scope_id */
        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                if (((struct sockaddr *)(&net->ro._l_addr))->sa_family !=
                    AF_INET6)
                        continue;
                net6 = (struct sockaddr_in6 *)&net->ro._l_addr;
                if (IN6_IS_ADDR_LINKLOCAL(&net6->sin6_addr) == 0)
                        continue;
                if (sctp_is_same_scope(sin6, net6)) {
                        /* found one */
                        return (1);
                }
        }
        /* didn't find one */
        return (0);
}
#endif

/*
 * address management functions
 */
static void
sctp_addr_mgmt_assoc(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    struct sctp_ifa *ifa, uint16_t type, int addr_locked)
{
        int status;

        if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0 ||
            sctp_is_feature_off(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
                /* subset bound, no ASCONF allowed case, so ignore */
                return;
        }
        /*
         * note: we know this is not the subset bound, no ASCONF case eg.
         * this is boundall or subset bound w/ASCONF allowed
         */

        /* first, make sure that the address is IPv4 or IPv6 and not jailed */
        switch (ifa->address.sa.sa_family) {
#ifdef INET6
        case AF_INET6:
                if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
                    &ifa->address.sin6.sin6_addr) != 0) {
                        return;
                }
                break;
#endif
#ifdef INET
        case AF_INET:
                if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
                    &ifa->address.sin.sin_addr) != 0) {
                        return;
                }
                break;
#endif
        default:
                return;
        }
#ifdef INET6
        /* make sure we're "allowed" to add this type of addr */
        if (ifa->address.sa.sa_family == AF_INET6) {
                /* invalid if we're not a v6 endpoint */
                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0)
                        return;
                /* is the v6 addr really valid ? */
                if (ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                        return;
                }
        }
#endif
        /* put this address on the "pending/do not use yet" list */
        sctp_add_local_addr_restricted(stcb, ifa);
        /*
         * check address scope if address is out of scope, don't queue
         * anything... note: this would leave the address on both inp and
         * asoc lists
         */
        switch (ifa->address.sa.sa_family) {
#ifdef INET6
        case AF_INET6:
                {
                        struct sockaddr_in6 *sin6;

                        sin6 = &ifa->address.sin6;
                        if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                /* we skip unspecifed addresses */
                                return;
                        }
                        if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                if (stcb->asoc.scope.local_scope == 0) {
                                        return;
                                }
                                /* is it the right link local scope? */
                                if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
                                        return;
                                }
                        }
                        if (stcb->asoc.scope.site_scope == 0 &&
                            IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr)) {
                                return;
                        }
                        break;
                }
#endif
#ifdef INET
        case AF_INET:
                {
                        struct sockaddr_in *sin;

                        /* invalid if we are a v6 only endpoint */
                        if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                            SCTP_IPV6_V6ONLY(inp))
                                return;

                        sin = &ifa->address.sin;
                        if (sin->sin_addr.s_addr == 0) {
                                /* we skip unspecifed addresses */
                                return;
                        }
                        if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                            IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                                return;
                        }
                        break;
                }
#endif
        default:
                /* else, not AF_INET or AF_INET6, so skip */
                return;
        }

        /* queue an asconf for this address add/delete */
        if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF)) {
                /* does the peer do asconf? */
                if (stcb->asoc.asconf_supported) {
                        /* queue an asconf for this addr */
                        status = sctp_asconf_queue_add(stcb, ifa, type);

                        /*
                         * if queued ok, and in the open state, send out the
                         * ASCONF.  If in the non-open state, these will be
                         * sent when the state goes open.
                         */
                        if (status == 0 &&
                            ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                            (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED))) {
#ifdef SCTP_TIMER_BASED_ASCONF
                                sctp_timer_start(SCTP_TIMER_TYPE_ASCONF, inp,
                                    stcb, stcb->asoc.primary_destination);
#else
                                sctp_send_asconf(stcb, NULL, addr_locked);
#endif
                        }
                }
        }
}


int
sctp_asconf_iterator_ep(struct sctp_inpcb *inp, void *ptr, uint32_t val SCTP_UNUSED)
{
        struct sctp_asconf_iterator *asc;
        struct sctp_ifa *ifa;
        struct sctp_laddr *l;
        int cnt_invalid = 0;

        asc = (struct sctp_asconf_iterator *)ptr;
        LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                ifa = l->ifa;
                switch (ifa->address.sa.sa_family) {
#ifdef INET6
                case AF_INET6:
                        /* invalid if we're not a v6 endpoint */
                        if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                                cnt_invalid++;
                                if (asc->cnt == cnt_invalid)
                                        return (1);
                        }
                        break;
#endif
#ifdef INET
                case AF_INET:
                        {
                                /* invalid if we are a v6 only endpoint */
                                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                    SCTP_IPV6_V6ONLY(inp)) {
                                        cnt_invalid++;
                                        if (asc->cnt == cnt_invalid)
                                                return (1);
                                }
                                break;
                        }
#endif
                default:
                        /* invalid address family */
                        cnt_invalid++;
                        if (asc->cnt == cnt_invalid)
                                return (1);
                }
        }
        return (0);
}

static int
sctp_asconf_iterator_ep_end(struct sctp_inpcb *inp, void *ptr, uint32_t val SCTP_UNUSED)
{
        struct sctp_ifa *ifa;
        struct sctp_asconf_iterator *asc;
        struct sctp_laddr *laddr, *nladdr, *l;

        /* Only for specific case not bound all */
        asc = (struct sctp_asconf_iterator *)ptr;
        LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                ifa = l->ifa;
                if (l->action == SCTP_ADD_IP_ADDRESS) {
                        LIST_FOREACH(laddr, &inp->sctp_addr_list,
                            sctp_nxt_addr) {
                                if (laddr->ifa == ifa) {
                                        laddr->action = 0;
                                        break;
                                }

                        }
                } else if (l->action == SCTP_DEL_IP_ADDRESS) {
                        LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
                                /* remove only after all guys are done */
                                if (laddr->ifa == ifa) {
                                        sctp_del_local_addr_ep(inp, ifa);
                                }
                        }
                }
        }
        return (0);
}

void
sctp_asconf_iterator_stcb(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
    void *ptr, uint32_t val SCTP_UNUSED)
{
        struct sctp_asconf_iterator *asc;
        struct sctp_ifa *ifa;
        struct sctp_laddr *l;
        int cnt_invalid = 0;
        int type, status;
        int num_queued = 0;

        asc = (struct sctp_asconf_iterator *)ptr;
        LIST_FOREACH(l, &asc->list_of_work, sctp_nxt_addr) {
                ifa = l->ifa;
                type = l->action;

                /* address's vrf_id must be the vrf_id of the assoc */
                if (ifa->vrf_id != stcb->asoc.vrf_id) {
                        continue;
                }

                /* Same checks again for assoc */
                switch (ifa->address.sa.sa_family) {
#ifdef INET6
                case AF_INET6:
                        {
                                /* invalid if we're not a v6 endpoint */
                                struct sockaddr_in6 *sin6;

                                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) == 0) {
                                        cnt_invalid++;
                                        if (asc->cnt == cnt_invalid)
                                                return;
                                        else
                                                continue;
                                }
                                sin6 = &ifa->address.sin6;
                                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                        /* we skip unspecifed addresses */
                                        continue;
                                }
                                if (prison_check_ip6(inp->ip_inp.inp.inp_cred,
                                    &sin6->sin6_addr) != 0) {
                                        continue;
                                }
                                if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                        if (stcb->asoc.scope.local_scope == 0) {
                                                continue;
                                        }
                                        /* is it the right link local scope? */
                                        if (sctp_is_scopeid_in_nets(stcb, &ifa->address.sa) == 0) {
                                                continue;
                                        }
                                }
                                break;
                        }
#endif
#ifdef INET
                case AF_INET:
                        {
                                /* invalid if we are a v6 only endpoint */
                                struct sockaddr_in *sin;

                                /* invalid if we are a v6 only endpoint */
                                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                    SCTP_IPV6_V6ONLY(inp))
                                        continue;

                                sin = &ifa->address.sin;
                                if (sin->sin_addr.s_addr == 0) {
                                        /* we skip unspecifed addresses */
                                        continue;
                                }
                                if (prison_check_ip4(inp->ip_inp.inp.inp_cred,
                                    &sin->sin_addr) != 0) {
                                        continue;
                                }
                                if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                                    IN4_ISPRIVATE_ADDRESS(&sin->sin_addr)) {
                                        continue;
                                }
                                if ((inp->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) &&
                                    SCTP_IPV6_V6ONLY(inp)) {
                                        cnt_invalid++;
                                        if (asc->cnt == cnt_invalid)
                                                return;
                                        else
                                                continue;
                                }
                                break;
                        }
#endif
                default:
                        /* invalid address family */
                        cnt_invalid++;
                        if (asc->cnt == cnt_invalid)
                                return;
                        else
                                continue;
                        break;
                }

                if (type == SCTP_ADD_IP_ADDRESS) {
                        /* prevent this address from being used as a source */
                        sctp_add_local_addr_restricted(stcb, ifa);
                } else if (type == SCTP_DEL_IP_ADDRESS) {
                        struct sctp_nets *net;

                        TAILQ_FOREACH(net, &stcb->asoc.nets, sctp_next) {
                                /* delete this address if cached */
                                if (net->ro._s_addr == ifa) {
                                        sctp_free_ifa(net->ro._s_addr);
                                        net->ro._s_addr = NULL;
                                        net->src_addr_selected = 0;
                                        RO_NHFREE(&net->ro);
                                        /*
                                         * Now we deleted our src address,
                                         * should we not also now reset the
                                         * cwnd/rto to start as if its a new
                                         * address?
                                         */
                                        stcb->asoc.cc_functions.sctp_set_initial_cc_param(stcb, net);
                                        net->RTO = 0;

                                }
                        }
                } else if (type == SCTP_SET_PRIM_ADDR) {
                        if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) == 0) {
                                /* must validate the ifa is in the ep */
                                if (sctp_is_addr_in_ep(stcb->sctp_ep, ifa) == 0) {
                                        continue;
                                }
                        } else {
                                /* Need to check scopes for this guy */
                                if (sctp_is_address_in_scope(ifa, &stcb->asoc.scope, 0) == 0) {
                                        continue;
                                }
                        }
                }
                /* queue an asconf for this address add/delete */
                if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_DO_ASCONF) &&
                    stcb->asoc.asconf_supported == 1) {
                        /* queue an asconf for this addr */
                        status = sctp_asconf_queue_add(stcb, ifa, type);
                        /*
                         * if queued ok, and in the open state, update the
                         * count of queued params.  If in the non-open
                         * state, these get sent when the assoc goes open.
                         */
                        if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                            (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
                                if (status >= 0) {
                                        num_queued++;
                                }
                        }
                }
        }
        /*
         * If we have queued params in the open state, send out an ASCONF.
         */
        if (num_queued > 0) {
                sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
        }
}

void
sctp_asconf_iterator_end(void *ptr, uint32_t val SCTP_UNUSED)
{
        struct sctp_asconf_iterator *asc;
        struct sctp_ifa *ifa;
        struct sctp_laddr *l, *nl;

        asc = (struct sctp_asconf_iterator *)ptr;
        LIST_FOREACH_SAFE(l, &asc->list_of_work, sctp_nxt_addr, nl) {
                ifa = l->ifa;
                if (l->action == SCTP_ADD_IP_ADDRESS) {
                        /* Clear the defer use flag */
                        ifa->localifa_flags &= ~SCTP_ADDR_DEFER_USE;
                }
                sctp_free_ifa(ifa);
                SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_laddr), l);
                SCTP_DECR_LADDR_COUNT();
        }
        SCTP_FREE(asc, SCTP_M_ASC_IT);
}

/*
 * sa is the sockaddr to ask the peer to set primary to.
 * returns: 0 = completed, -1 = error
 */
int32_t
sctp_set_primary_ip_address_sa(struct sctp_tcb *stcb, struct sockaddr *sa)
{
        uint32_t vrf_id;
        struct sctp_ifa *ifa;

        /* find the ifa for the desired set primary */
        vrf_id = stcb->asoc.vrf_id;
        ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
        if (ifa == NULL) {
                /* Invalid address */
                return (-1);
        }

        /* queue an ASCONF:SET_PRIM_ADDR to be sent */
        if (!sctp_asconf_queue_add(stcb, ifa, SCTP_SET_PRIM_ADDR)) {
                /* set primary queuing succeeded */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "set_primary_ip_address_sa: queued on tcb=%p, ",
                    (void *)stcb);
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                if ((SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) ||
                    (SCTP_GET_STATE(stcb) == SCTP_STATE_SHUTDOWN_RECEIVED)) {
#ifdef SCTP_TIMER_BASED_ASCONF
                        sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
                            stcb->sctp_ep, stcb,
                            stcb->asoc.primary_destination);
#else
                        sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
#endif
                }
        } else {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "set_primary_ip_address_sa: failed to add to queue on tcb=%p, ",
                    (void *)stcb);
                SCTPDBG_ADDR(SCTP_DEBUG_ASCONF1, sa);
                return (-1);
        }
        return (0);
}

int
sctp_is_addr_pending(struct sctp_tcb *stcb, struct sctp_ifa *sctp_ifa)
{
        struct sctp_tmit_chunk *chk, *nchk;
        unsigned int offset, asconf_limit;
        struct sctp_asconf_chunk *acp;
        struct sctp_asconf_paramhdr *aph;
        uint8_t aparam_buf[SCTP_PARAM_BUFFER_SIZE];
        struct sctp_paramhdr *ph;
        int add_cnt, del_cnt;
        uint16_t last_param_type;

        add_cnt = del_cnt = 0;
        last_param_type = 0;
        TAILQ_FOREACH_SAFE(chk, &stcb->asoc.asconf_send_queue, sctp_next, nchk) {
                if (chk->data == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: No mbuf data?\n");
                        continue;
                }
                offset = 0;
                acp = mtod(chk->data, struct sctp_asconf_chunk *);
                offset += sizeof(struct sctp_asconf_chunk);
                asconf_limit = ntohs(acp->ch.chunk_length);
                ph = (struct sctp_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_paramhdr), aparam_buf);
                if (ph == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get lookup addr!\n");
                        continue;
                }
                offset += ntohs(ph->param_length);

                aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                if (aph == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: Empty ASCONF will be sent?\n");
                        continue;
                }
                while (aph != NULL) {
                        unsigned int param_length, param_type;

                        param_type = ntohs(aph->ph.param_type);
                        param_length = ntohs(aph->ph.param_length);
                        if (offset + param_length > asconf_limit) {
                                /* parameter goes beyond end of chunk! */
                                break;
                        }
                        if (param_length > sizeof(aparam_buf)) {
                                SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length (%u) larger than buffer size!\n", param_length);
                                break;
                        }
                        if (param_length <= sizeof(struct sctp_paramhdr)) {
                                SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: param length(%u) too short\n", param_length);
                                break;
                        }

                        aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, param_length, aparam_buf);
                        if (aph == NULL) {
                                SCTPDBG(SCTP_DEBUG_ASCONF1, "is_addr_pending: couldn't get entire param\n");
                                break;
                        }

                        ph = (struct sctp_paramhdr *)(aph + 1);
                        if (sctp_addr_match(ph, &sctp_ifa->address.sa) != 0) {
                                switch (param_type) {
                                case SCTP_ADD_IP_ADDRESS:
                                        add_cnt++;
                                        break;
                                case SCTP_DEL_IP_ADDRESS:
                                        del_cnt++;
                                        break;
                                default:
                                        break;
                                }
                                last_param_type = param_type;
                        }

                        offset += SCTP_SIZE32(param_length);
                        if (offset >= asconf_limit) {
                                /* no more data in the mbuf chain */
                                break;
                        }
                        /* get pointer to next asconf param */
                        aph = (struct sctp_asconf_paramhdr *)sctp_m_getptr(chk->data, offset, sizeof(struct sctp_asconf_paramhdr), aparam_buf);
                }
        }

        /*
         * we want to find the sequences which consist of ADD -> DEL -> ADD
         * or DEL -> ADD
         */
        if (add_cnt > del_cnt ||
            (add_cnt == del_cnt && last_param_type == SCTP_ADD_IP_ADDRESS)) {
                return (1);
        }
        return (0);
}

static struct sockaddr *
sctp_find_valid_localaddr(struct sctp_tcb *stcb, int addr_locked)
{
        struct sctp_vrf *vrf = NULL;
        struct sctp_ifn *sctp_ifn;
        struct sctp_ifa *sctp_ifa;

        if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                SCTP_IPI_ADDR_RLOCK();
        vrf = sctp_find_vrf(stcb->asoc.vrf_id);
        if (vrf == NULL) {
                if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                        SCTP_IPI_ADDR_RUNLOCK();
                return (NULL);
        }
        LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                if (stcb->asoc.scope.loopback_scope == 0 &&
                    SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                        /* Skip if loopback_scope not set */
                        continue;
                }
                LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                        switch (sctp_ifa->address.sa.sa_family) {
#ifdef INET
                        case AF_INET:
                                if (stcb->asoc.scope.ipv4_addr_legal) {
                                        struct sockaddr_in *sin;

                                        sin = &sctp_ifa->address.sin;
                                        if (sin->sin_addr.s_addr == 0) {
                                                /* skip unspecifed addresses */
                                                continue;
                                        }
                                        if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                            &sin->sin_addr) != 0) {
                                                continue;
                                        }
                                        if (stcb->asoc.scope.ipv4_local_scope == 0 &&
                                            IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))
                                                continue;

                                        if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
                                            (!sctp_is_addr_pending(stcb, sctp_ifa)))
                                                continue;
                                        /*
                                         * found a valid local v4 address to
                                         * use
                                         */
                                        if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                                                SCTP_IPI_ADDR_RUNLOCK();
                                        return (&sctp_ifa->address.sa);
                                }
                                break;
#endif
#ifdef INET6
                        case AF_INET6:
                                if (stcb->asoc.scope.ipv6_addr_legal) {
                                        struct sockaddr_in6 *sin6;

                                        if (sctp_ifa->localifa_flags & SCTP_ADDR_IFA_UNUSEABLE) {
                                                continue;
                                        }

                                        sin6 = &sctp_ifa->address.sin6;
                                        if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                                                /*
                                                 * we skip unspecifed
                                                 * addresses
                                                 */
                                                continue;
                                        }
                                        if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                            &sin6->sin6_addr) != 0) {
                                                continue;
                                        }
                                        if (stcb->asoc.scope.local_scope == 0 &&
                                            IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
                                                continue;
                                        if (stcb->asoc.scope.site_scope == 0 &&
                                            IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))
                                                continue;

                                        if (sctp_is_addr_restricted(stcb, sctp_ifa) &&
                                            (!sctp_is_addr_pending(stcb, sctp_ifa)))
                                                continue;
                                        /*
                                         * found a valid local v6 address to
                                         * use
                                         */
                                        if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                                                SCTP_IPI_ADDR_RUNLOCK();
                                        return (&sctp_ifa->address.sa);
                                }
                                break;
#endif
                        default:
                                break;
                        }
                }
        }
        /* no valid addresses found */
        if (addr_locked == SCTP_ADDR_NOT_LOCKED)
                SCTP_IPI_ADDR_RUNLOCK();
        return (NULL);
}

static struct sockaddr *
sctp_find_valid_localaddr_ep(struct sctp_tcb *stcb)
{
        struct sctp_laddr *laddr;

        LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                if (laddr->ifa == NULL) {
                        continue;
                }
                /* is the address restricted ? */
                if (sctp_is_addr_restricted(stcb, laddr->ifa) &&
                    (!sctp_is_addr_pending(stcb, laddr->ifa)))
                        continue;

                /* found a valid local address to use */
                return (&laddr->ifa->address.sa);
        }
        /* no valid addresses found */
        return (NULL);
}

/*
 * builds an ASCONF chunk from queued ASCONF params.
 * returns NULL on error (no mbuf, no ASCONF params queued, etc).
 */
struct mbuf *
sctp_compose_asconf(struct sctp_tcb *stcb, int *retlen, int addr_locked)
{
        struct mbuf *m_asconf, *m_asconf_chk;
        struct sctp_asconf_addr *aa;
        struct sctp_asconf_chunk *acp;
        struct sctp_asconf_paramhdr *aph;
        struct sctp_asconf_addr_param *aap;
        uint32_t p_length;
        uint32_t correlation_id = 1;    /* 0 is reserved... */
        caddr_t ptr, lookup_ptr;
        uint8_t lookup_used = 0;

        /* are there any asconf params to send? */
        TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                if (aa->sent == 0)
                        break;
        }
        if (aa == NULL)
                return (NULL);

        /*
         * get a chunk header mbuf and a cluster for the asconf params since
         * it's simpler to fill in the asconf chunk header lookup address on
         * the fly
         */
        m_asconf_chk = sctp_get_mbuf_for_msg(sizeof(struct sctp_asconf_chunk), 0, M_NOWAIT, 1, MT_DATA);
        if (m_asconf_chk == NULL) {
                /* no mbuf's */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "compose_asconf: couldn't get chunk mbuf!\n");
                return (NULL);
        }
        m_asconf = sctp_get_mbuf_for_msg(MCLBYTES, 0, M_NOWAIT, 1, MT_DATA);
        if (m_asconf == NULL) {
                /* no mbuf's */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "compose_asconf: couldn't get mbuf!\n");
                sctp_m_freem(m_asconf_chk);
                return (NULL);
        }
        SCTP_BUF_LEN(m_asconf_chk) = sizeof(struct sctp_asconf_chunk);
        SCTP_BUF_LEN(m_asconf) = 0;
        acp = mtod(m_asconf_chk, struct sctp_asconf_chunk *);
        memset(acp, 0, sizeof(struct sctp_asconf_chunk));
        /* save pointers to lookup address and asconf params */
        lookup_ptr = (caddr_t)(acp + 1);        /* after the header */
        ptr = mtod(m_asconf, caddr_t);  /* beginning of cluster */

        /* fill in chunk header info */
        acp->ch.chunk_type = SCTP_ASCONF;
        acp->ch.chunk_flags = 0;
        acp->serial_number = htonl(stcb->asoc.asconf_seq_out);
        stcb->asoc.asconf_seq_out++;

        /* add parameters... up to smallest MTU allowed */
        TAILQ_FOREACH(aa, &stcb->asoc.asconf_queue, next) {
                if (aa->sent)
                        continue;
                /* get the parameter length */
                p_length = SCTP_SIZE32(aa->ap.aph.ph.param_length);
                /* will it fit in current chunk? */
                if ((SCTP_BUF_LEN(m_asconf) + p_length > stcb->asoc.smallest_mtu) ||
                    (SCTP_BUF_LEN(m_asconf) + p_length > MCLBYTES)) {
                        /* won't fit, so we're done with this chunk */
                        break;
                }
                /* assign (and store) a correlation id */
                aa->ap.aph.correlation_id = correlation_id++;

                /*
                 * fill in address if we're doing a delete this is a simple
                 * way for us to fill in the correlation address, which
                 * should only be used by the peer if we're deleting our
                 * source address and adding a new address (e.g. renumbering
                 * case)
                 */
                if (lookup_used == 0 &&
                    (aa->special_del == 0) &&
                    aa->ap.aph.ph.param_type == SCTP_DEL_IP_ADDRESS) {
                        struct sctp_ipv6addr_param *lookup;
                        uint16_t p_size, addr_size;

                        lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
                        lookup->ph.param_type =
                            htons(aa->ap.addrp.ph.param_type);
                        if (aa->ap.addrp.ph.param_type == SCTP_IPV6_ADDRESS) {
                                /* copy IPv6 address */
                                p_size = sizeof(struct sctp_ipv6addr_param);
                                addr_size = sizeof(struct in6_addr);
                        } else {
                                /* copy IPv4 address */
                                p_size = sizeof(struct sctp_ipv4addr_param);
                                addr_size = sizeof(struct in_addr);
                        }
                        lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
                        memcpy(lookup->addr, &aa->ap.addrp.addr, addr_size);
                        SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
                        lookup_used = 1;
                }
                /* copy into current space */
                memcpy(ptr, &aa->ap, p_length);

                /* network elements and update lengths */
                aph = (struct sctp_asconf_paramhdr *)ptr;
                aap = (struct sctp_asconf_addr_param *)ptr;
                /* correlation_id is transparent to peer, no htonl needed */
                aph->ph.param_type = htons(aph->ph.param_type);
                aph->ph.param_length = htons(aph->ph.param_length);
                aap->addrp.ph.param_type = htons(aap->addrp.ph.param_type);
                aap->addrp.ph.param_length = htons(aap->addrp.ph.param_length);

                SCTP_BUF_LEN(m_asconf) += SCTP_SIZE32(p_length);
                ptr += SCTP_SIZE32(p_length);

                /*
                 * these params are removed off the pending list upon
                 * getting an ASCONF-ACK back from the peer, just set flag
                 */
                aa->sent = 1;
        }
        /* check to see if the lookup addr has been populated yet */
        if (lookup_used == 0) {
                /* NOTE: if the address param is optional, can skip this... */
                /* add any valid (existing) address... */
                struct sctp_ipv6addr_param *lookup;
                uint16_t p_size, addr_size;
                struct sockaddr *found_addr;
                caddr_t addr_ptr;

                if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL)
                        found_addr = sctp_find_valid_localaddr(stcb,
                            addr_locked);
                else
                        found_addr = sctp_find_valid_localaddr_ep(stcb);

                lookup = (struct sctp_ipv6addr_param *)lookup_ptr;
                if (found_addr != NULL) {
                        switch (found_addr->sa_family) {
#ifdef INET6
                        case AF_INET6:
                                /* copy IPv6 address */
                                lookup->ph.param_type =
                                    htons(SCTP_IPV6_ADDRESS);
                                p_size = sizeof(struct sctp_ipv6addr_param);
                                addr_size = sizeof(struct in6_addr);
                                addr_ptr = (caddr_t)&((struct sockaddr_in6 *)
                                    found_addr)->sin6_addr;
                                break;
#endif
#ifdef INET
                        case AF_INET:
                                /* copy IPv4 address */
                                lookup->ph.param_type =
                                    htons(SCTP_IPV4_ADDRESS);
                                p_size = sizeof(struct sctp_ipv4addr_param);
                                addr_size = sizeof(struct in_addr);
                                addr_ptr = (caddr_t)&((struct sockaddr_in *)
                                    found_addr)->sin_addr;
                                break;
#endif
                        default:
                                p_size = 0;
                                addr_size = 0;
                                addr_ptr = NULL;
                                break;
                        }
                        lookup->ph.param_length = htons(SCTP_SIZE32(p_size));
                        memcpy(lookup->addr, addr_ptr, addr_size);
                        SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(p_size);
                } else {
                        /* uh oh... don't have any address?? */
                        SCTPDBG(SCTP_DEBUG_ASCONF1,
                            "compose_asconf: no lookup addr!\n");
                        /* XXX for now, we send a IPv4 address of 0.0.0.0 */
                        lookup->ph.param_type = htons(SCTP_IPV4_ADDRESS);
                        lookup->ph.param_length = htons(SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param)));
                        memset(lookup->addr, 0, sizeof(struct in_addr));
                        SCTP_BUF_LEN(m_asconf_chk) += SCTP_SIZE32(sizeof(struct sctp_ipv4addr_param));
                }
        }
        /* chain it all together */
        SCTP_BUF_NEXT(m_asconf_chk) = m_asconf;
        *retlen = SCTP_BUF_LEN(m_asconf_chk) + SCTP_BUF_LEN(m_asconf);
        acp->ch.chunk_length = htons(*retlen);

        return (m_asconf_chk);
}

/*
 * section to handle address changes before an association is up eg. changes
 * during INIT/INIT-ACK/COOKIE-ECHO handshake
 */

/*
 * processes the (local) addresses in the INIT-ACK chunk
 */
static void
sctp_process_initack_addresses(struct sctp_tcb *stcb, struct mbuf *m,
    unsigned int offset, unsigned int length)
{
        struct sctp_paramhdr tmp_param, *ph;
        uint16_t plen, ptype;
        struct sctp_ifa *sctp_ifa;
        union sctp_sockstore store;
#ifdef INET6
        struct sctp_ipv6addr_param addr6_store;
#endif
#ifdef INET
        struct sctp_ipv4addr_param addr4_store;
#endif

        SCTPDBG(SCTP_DEBUG_ASCONF2, "processing init-ack addresses\n");
        if (stcb == NULL)       /* Un-needed check for SA */
                return;

        /* convert to upper bound */
        length += offset;

        if ((offset + sizeof(struct sctp_paramhdr)) > length) {
                return;
        }
        /* go through the addresses in the init-ack */
        ph = (struct sctp_paramhdr *)
            sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
            (uint8_t *)&tmp_param);
        while (ph != NULL) {
                ptype = ntohs(ph->param_type);
                plen = ntohs(ph->param_length);
                switch (ptype) {
#ifdef INET6
                case SCTP_IPV6_ADDRESS:
                        {
                                struct sctp_ipv6addr_param *a6p;

                                /* get the entire IPv6 address param */
                                a6p = (struct sctp_ipv6addr_param *)
                                    sctp_m_getptr(m, offset,
                                    sizeof(struct sctp_ipv6addr_param),
                                    (uint8_t *)&addr6_store);
                                if (plen != sizeof(struct sctp_ipv6addr_param) ||
                                    a6p == NULL) {
                                        return;
                                }
                                memset(&store, 0, sizeof(union sctp_sockstore));
                                store.sin6.sin6_family = AF_INET6;
                                store.sin6.sin6_len = sizeof(struct sockaddr_in6);
                                store.sin6.sin6_port = stcb->rport;
                                memcpy(&store.sin6.sin6_addr, a6p->addr, sizeof(struct in6_addr));
                                break;
                        }
#endif
#ifdef INET
                case SCTP_IPV4_ADDRESS:
                        {
                                struct sctp_ipv4addr_param *a4p;

                                /* get the entire IPv4 address param */
                                a4p = (struct sctp_ipv4addr_param *)sctp_m_getptr(m, offset,
                                    sizeof(struct sctp_ipv4addr_param),
                                    (uint8_t *)&addr4_store);
                                if (plen != sizeof(struct sctp_ipv4addr_param) ||
                                    a4p == NULL) {
                                        return;
                                }
                                memset(&store, 0, sizeof(union sctp_sockstore));
                                store.sin.sin_family = AF_INET;
                                store.sin.sin_len = sizeof(struct sockaddr_in);
                                store.sin.sin_port = stcb->rport;
                                store.sin.sin_addr.s_addr = a4p->addr;
                                break;
                        }
#endif
                default:
                        goto next_addr;
                }

                /* see if this address really (still) exists */
                sctp_ifa = sctp_find_ifa_by_addr(&store.sa, stcb->asoc.vrf_id,
                    SCTP_ADDR_NOT_LOCKED);
                if (sctp_ifa == NULL) {
                        /* address doesn't exist anymore */
                        int status;

                        /* are ASCONFs allowed ? */
                        if ((sctp_is_feature_on(stcb->sctp_ep,
                            SCTP_PCB_FLAGS_DO_ASCONF)) &&
                            stcb->asoc.asconf_supported) {
                                /* queue an ASCONF DEL_IP_ADDRESS */
                                status = sctp_asconf_queue_sa_delete(stcb, &store.sa);
                                /*
                                 * if queued ok, and in correct state, send
                                 * out the ASCONF.
                                 */
                                if (status == 0 &&
                                    SCTP_GET_STATE(stcb) == SCTP_STATE_OPEN) {
#ifdef SCTP_TIMER_BASED_ASCONF
                                        sctp_timer_start(SCTP_TIMER_TYPE_ASCONF,
                                            stcb->sctp_ep, stcb,
                                            stcb->asoc.primary_destination);
#else
                                        sctp_send_asconf(stcb, NULL, SCTP_ADDR_NOT_LOCKED);
#endif
                                }
                        }
                }

next_addr:
                /*
                 * Sanity check:  Make sure the length isn't 0, otherwise
                 * we'll be stuck in this loop for a long time...
                 */
                if (SCTP_SIZE32(plen) == 0) {
                        SCTP_PRINTF("process_initack_addrs: bad len (%d) type=%xh\n",
                            plen, ptype);
                        return;
                }
                /* get next parameter */
                offset += SCTP_SIZE32(plen);
                if ((offset + sizeof(struct sctp_paramhdr)) > length)
                        return;
                ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
                    sizeof(struct sctp_paramhdr), (uint8_t *)&tmp_param);
        }                       /* while */
}

/* FIX ME: need to verify return result for v6 address type if v6 disabled */
/*
 * checks to see if a specific address is in the initack address list returns
 * 1 if found, 0 if not
 */
static uint32_t
sctp_addr_in_initack(struct mbuf *m, uint32_t offset, uint32_t length, struct sockaddr *sa)
{
        struct sctp_paramhdr tmp_param, *ph;
        uint16_t plen, ptype;
#ifdef INET
        struct sockaddr_in *sin;
        struct sctp_ipv4addr_param *a4p;
        struct sctp_ipv6addr_param addr4_store;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
        struct sctp_ipv6addr_param *a6p;
        struct sctp_ipv6addr_param addr6_store;
        struct sockaddr_in6 sin6_tmp;
#endif

        switch (sa->sa_family) {
#ifdef INET
        case AF_INET:
                break;
#endif
#ifdef INET6
        case AF_INET6:
                break;
#endif
        default:
                return (0);
        }

        SCTPDBG(SCTP_DEBUG_ASCONF2, "find_initack_addr: starting search for ");
        SCTPDBG_ADDR(SCTP_DEBUG_ASCONF2, sa);
        /* convert to upper bound */
        length += offset;

        if ((offset + sizeof(struct sctp_paramhdr)) > length) {
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "find_initack_addr: invalid offset?\n");
                return (0);
        }
        /* go through the addresses in the init-ack */
        ph = (struct sctp_paramhdr *)sctp_m_getptr(m, offset,
            sizeof(struct sctp_paramhdr), (uint8_t *)&tmp_param);
        while (ph != NULL) {
                ptype = ntohs(ph->param_type);
                plen = ntohs(ph->param_length);
                switch (ptype) {
#ifdef INET6
                case SCTP_IPV6_ADDRESS:
                        if (sa->sa_family == AF_INET6) {
                                /* get the entire IPv6 address param */
                                if (plen != sizeof(struct sctp_ipv6addr_param)) {
                                        break;
                                }
                                /* get the entire IPv6 address param */
                                a6p = (struct sctp_ipv6addr_param *)
                                    sctp_m_getptr(m, offset,
                                    sizeof(struct sctp_ipv6addr_param),
                                    (uint8_t *)&addr6_store);
                                if (a6p == NULL) {
                                        return (0);
                                }
                                sin6 = (struct sockaddr_in6 *)sa;
                                if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) {
                                        /* create a copy and clear scope */
                                        memcpy(&sin6_tmp, sin6,
                                            sizeof(struct sockaddr_in6));
                                        sin6 = &sin6_tmp;
                                        in6_clearscope(&sin6->sin6_addr);
                                }
                                if (memcmp(&sin6->sin6_addr, a6p->addr,
                                    sizeof(struct in6_addr)) == 0) {
                                        /* found it */
                                        return (1);
                                }
                        }
                        break;
#endif                          /* INET6 */
#ifdef INET
                case SCTP_IPV4_ADDRESS:
                        if (sa->sa_family == AF_INET) {
                                if (plen != sizeof(struct sctp_ipv4addr_param)) {
                                        break;
                                }
                                /* get the entire IPv4 address param */
                                a4p = (struct sctp_ipv4addr_param *)
                                    sctp_m_getptr(m, offset,
                                    sizeof(struct sctp_ipv4addr_param),
                                    (uint8_t *)&addr4_store);
                                if (a4p == NULL) {
                                        return (0);
                                }
                                sin = (struct sockaddr_in *)sa;
                                if (sin->sin_addr.s_addr == a4p->addr) {
                                        /* found it */
                                        return (1);
                                }
                        }
                        break;
#endif
                default:
                        break;
                }
                /* get next parameter */
                offset += SCTP_SIZE32(plen);
                if (offset + sizeof(struct sctp_paramhdr) > length) {
                        return (0);
                }
                ph = (struct sctp_paramhdr *)
                    sctp_m_getptr(m, offset, sizeof(struct sctp_paramhdr),
                    (uint8_t *)&tmp_param);
        }                       /* while */
        /* not found! */
        return (0);
}

/*
 * makes sure that the current endpoint local addr list is consistent with
 * the new association (eg. subset bound, asconf allowed) adds addresses as
 * necessary
 */
static void
sctp_check_address_list_ep(struct sctp_tcb *stcb, struct mbuf *m, int offset,
    int length, struct sockaddr *init_addr)
{
        struct sctp_laddr *laddr;

        /* go through the endpoint list */
        LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                /* be paranoid and validate the laddr */
                if (laddr->ifa == NULL) {
                        SCTPDBG(SCTP_DEBUG_ASCONF1,
                            "check_addr_list_ep: laddr->ifa is NULL");
                        continue;
                }
                /* do i have it implicitly? */
                if (sctp_cmpaddr(&laddr->ifa->address.sa, init_addr)) {
                        continue;
                }
                /* check to see if in the init-ack */
                if (!sctp_addr_in_initack(m, offset, length, &laddr->ifa->address.sa)) {
                        /* try to add it */
                        sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb, laddr->ifa,
                            SCTP_ADD_IP_ADDRESS, SCTP_ADDR_NOT_LOCKED);
                }
        }
}

/*
 * makes sure that the current kernel address list is consistent with the new
 * association (with all addrs bound) adds addresses as necessary
 */
static void
sctp_check_address_list_all(struct sctp_tcb *stcb, struct mbuf *m, int offset,
    int length, struct sockaddr *init_addr,
    uint16_t local_scope, uint16_t site_scope,
    uint16_t ipv4_scope, uint16_t loopback_scope)
{
        struct sctp_vrf *vrf = NULL;
        struct sctp_ifn *sctp_ifn;
        struct sctp_ifa *sctp_ifa;
        uint32_t vrf_id;
#ifdef INET
        struct sockaddr_in *sin;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
#endif

        if (stcb) {
                vrf_id = stcb->asoc.vrf_id;
        } else {
                return;
        }
        SCTP_IPI_ADDR_RLOCK();
        vrf = sctp_find_vrf(vrf_id);
        if (vrf == NULL) {
                SCTP_IPI_ADDR_RUNLOCK();
                return;
        }
        /* go through all our known interfaces */
        LIST_FOREACH(sctp_ifn, &vrf->ifnlist, next_ifn) {
                if (loopback_scope == 0 && SCTP_IFN_IS_IFT_LOOP(sctp_ifn)) {
                        /* skip loopback interface */
                        continue;
                }
                /* go through each interface address */
                LIST_FOREACH(sctp_ifa, &sctp_ifn->ifalist, next_ifa) {
                        /* do i have it implicitly? */
                        if (sctp_cmpaddr(&sctp_ifa->address.sa, init_addr)) {
                                continue;
                        }
                        switch (sctp_ifa->address.sa.sa_family) {
#ifdef INET
                        case AF_INET:
                                sin = &sctp_ifa->address.sin;
                                if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                    &sin->sin_addr) != 0) {
                                        continue;
                                }
                                if ((ipv4_scope == 0) &&
                                    (IN4_ISPRIVATE_ADDRESS(&sin->sin_addr))) {
                                        /* private address not in scope */
                                        continue;
                                }
                                break;
#endif
#ifdef INET6
                        case AF_INET6:
                                sin6 = &sctp_ifa->address.sin6;
                                if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                    &sin6->sin6_addr) != 0) {
                                        continue;
                                }
                                if ((local_scope == 0) &&
                                    (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
                                        continue;
                                }
                                if ((site_scope == 0) &&
                                    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
                                        continue;
                                }
                                break;
#endif
                        default:
                                break;
                        }
                        /* check to see if in the init-ack */
                        if (!sctp_addr_in_initack(m, offset, length, &sctp_ifa->address.sa)) {
                                /* try to add it */
                                sctp_addr_mgmt_assoc(stcb->sctp_ep, stcb,
                                    sctp_ifa, SCTP_ADD_IP_ADDRESS,
                                    SCTP_ADDR_LOCKED);
                        }
                }               /* end foreach ifa */
        }                       /* end foreach ifn */
        SCTP_IPI_ADDR_RUNLOCK();
}

/*
 * validates an init-ack chunk (from a cookie-echo) with current addresses
 * adds addresses from the init-ack into our local address list, if needed
 * queues asconf adds/deletes addresses as needed and makes appropriate list
 * changes for source address selection m, offset: points to the start of the
 * address list in an init-ack chunk length: total length of the address
 * params only init_addr: address where my INIT-ACK was sent from
 */
void
sctp_check_address_list(struct sctp_tcb *stcb, struct mbuf *m, int offset,
    int length, struct sockaddr *init_addr,
    uint16_t local_scope, uint16_t site_scope,
    uint16_t ipv4_scope, uint16_t loopback_scope)
{
        /* process the local addresses in the initack */
        sctp_process_initack_addresses(stcb, m, offset, length);

        if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                /* bound all case */
                sctp_check_address_list_all(stcb, m, offset, length, init_addr,
                    local_scope, site_scope, ipv4_scope, loopback_scope);
        } else {
                /* subset bound case */
                if (sctp_is_feature_on(stcb->sctp_ep,
                    SCTP_PCB_FLAGS_DO_ASCONF)) {
                        /* asconf's allowed */
                        sctp_check_address_list_ep(stcb, m, offset, length,
                            init_addr);
                }
                /* else, no asconfs allowed, so what we sent is what we get */
        }
}

/*
 * sctp_bindx() support
 */
uint32_t
sctp_addr_mgmt_ep_sa(struct sctp_inpcb *inp, struct sockaddr *sa,
    uint32_t type, uint32_t vrf_id, struct sctp_ifa *sctp_ifap)
{
        struct sctp_ifa *ifa;
        struct sctp_laddr *laddr, *nladdr;

        if (sa->sa_len == 0) {
                SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
                return (EINVAL);
        }
        if (sctp_ifap) {
                ifa = sctp_ifap;
        } else if (type == SCTP_ADD_IP_ADDRESS) {
                /* For an add the address MUST be on the system */
                ifa = sctp_find_ifa_by_addr(sa, vrf_id, SCTP_ADDR_NOT_LOCKED);
        } else if (type == SCTP_DEL_IP_ADDRESS) {
                /* For a delete we need to find it in the inp */
                ifa = sctp_find_ifa_in_ep(inp, sa, SCTP_ADDR_NOT_LOCKED);
        } else {
                ifa = NULL;
        }
        if (ifa != NULL) {
                if (type == SCTP_ADD_IP_ADDRESS) {
                        sctp_add_local_addr_ep(inp, ifa, type);
                } else if (type == SCTP_DEL_IP_ADDRESS) {
                        if (inp->laddr_count < 2) {
                                /* can't delete the last local address */
                                SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EINVAL);
                                return (EINVAL);
                        }
                        LIST_FOREACH(laddr, &inp->sctp_addr_list,
                            sctp_nxt_addr) {
                                if (ifa == laddr->ifa) {
                                        /* Mark in the delete */
                                        laddr->action = type;
                                }
                        }
                }
                if (LIST_EMPTY(&inp->sctp_asoc_list)) {
                        /*
                         * There is no need to start the iterator if the inp
                         * has no associations.
                         */
                        if (type == SCTP_DEL_IP_ADDRESS) {
                                LIST_FOREACH_SAFE(laddr, &inp->sctp_addr_list, sctp_nxt_addr, nladdr) {
                                        if (laddr->ifa == ifa) {
                                                sctp_del_local_addr_ep(inp, ifa);
                                        }
                                }
                        }
                } else {
                        struct sctp_asconf_iterator *asc;
                        struct sctp_laddr *wi;
                        int ret;

                        SCTP_MALLOC(asc, struct sctp_asconf_iterator *,
                            sizeof(struct sctp_asconf_iterator),
                            SCTP_M_ASC_IT);
                        if (asc == NULL) {
                                SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
                                return (ENOMEM);
                        }
                        wi = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_laddr), struct sctp_laddr);
                        if (wi == NULL) {
                                SCTP_FREE(asc, SCTP_M_ASC_IT);
                                SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, ENOMEM);
                                return (ENOMEM);
                        }
                        LIST_INIT(&asc->list_of_work);
                        asc->cnt = 1;
                        SCTP_INCR_LADDR_COUNT();
                        wi->ifa = ifa;
                        wi->action = type;
                        atomic_add_int(&ifa->refcount, 1);
                        LIST_INSERT_HEAD(&asc->list_of_work, wi, sctp_nxt_addr);
                        ret = sctp_initiate_iterator(sctp_asconf_iterator_ep,
                            sctp_asconf_iterator_stcb,
                            sctp_asconf_iterator_ep_end,
                            SCTP_PCB_ANY_FLAGS,
                            SCTP_PCB_ANY_FEATURES,
                            SCTP_ASOC_ANY_STATE,
                            (void *)asc, 0,
                            sctp_asconf_iterator_end, inp, 0);
                        if (ret) {
                                SCTP_PRINTF("Failed to initiate iterator for addr_mgmt_ep_sa\n");
                                SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EFAULT);
                                sctp_asconf_iterator_end(asc, 0);
                                return (EFAULT);
                        }
                }
                return (0);
        } else {
                /* invalid address! */
                SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_ASCONF, EADDRNOTAVAIL);
                return (EADDRNOTAVAIL);
        }
}

void
sctp_asconf_send_nat_state_update(struct sctp_tcb *stcb,
    struct sctp_nets *net)
{
        struct sctp_asconf_addr *aa;
        struct sctp_ifa *sctp_ifap;
        struct sctp_asconf_tag_param *vtag;
#ifdef INET
        struct sockaddr_in *to;
#endif
#ifdef INET6
        struct sockaddr_in6 *to6;
#endif
        if (net == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing net\n");
                return;
        }
        if (stcb == NULL) {
                SCTPDBG(SCTP_DEBUG_ASCONF1, "sctp_asconf_send_nat_state_update: Missing stcb\n");
                return;
        }
        /*
         * Need to have in the asconf: - vtagparam(my_vtag/peer_vtag) -
         * add(0.0.0.0) - del(0.0.0.0) - Any global addresses add(addr)
         */
        SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
            SCTP_M_ASC_ADDR);
        if (aa == NULL) {
                /* didn't get memory */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_send_nat_state_update: failed to get memory!\n");
                return;
        }
        aa->special_del = 0;
        /* fill in asconf address parameter fields */
        /* top level elements are "networked" during send */
        aa->ifa = NULL;
        aa->sent = 0;           /* clear sent flag */
        vtag = (struct sctp_asconf_tag_param *)&aa->ap.aph;
        vtag->aph.ph.param_type = SCTP_NAT_VTAGS;
        vtag->aph.ph.param_length = sizeof(struct sctp_asconf_tag_param);
        vtag->local_vtag = htonl(stcb->asoc.my_vtag);
        vtag->remote_vtag = htonl(stcb->asoc.peer_vtag);
        TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);

        SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
            SCTP_M_ASC_ADDR);
        if (aa == NULL) {
                /* didn't get memory */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_send_nat_state_update: failed to get memory!\n");
                return;
        }
        memset(aa, 0, sizeof(struct sctp_asconf_addr));
        /* fill in asconf address parameter fields */
        /* ADD(0.0.0.0) */
        switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
        case AF_INET:
                aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
                aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
                aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
                /* No need to add an address, we are using 0.0.0.0 */
                TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
                break;
#endif
#ifdef INET6
        case AF_INET6:
                aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
                aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
                aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
                /* No need to add an address, we are using 0.0.0.0 */
                TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
                break;
#endif
        default:
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_send_nat_state_update: unknown address family\n");
                SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                return;
        }
        SCTP_MALLOC(aa, struct sctp_asconf_addr *, sizeof(*aa),
            SCTP_M_ASC_ADDR);
        if (aa == NULL) {
                /* didn't get memory */
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_send_nat_state_update: failed to get memory!\n");
                return;
        }
        memset(aa, 0, sizeof(struct sctp_asconf_addr));
        /* fill in asconf address parameter fields */
        /* ADD(0.0.0.0) */
        switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
        case AF_INET:
                aa->ap.aph.ph.param_type = SCTP_ADD_IP_ADDRESS;
                aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addrv4_param);
                aa->ap.addrp.ph.param_type = SCTP_IPV4_ADDRESS;
                aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv4addr_param);
                /* No need to add an address, we are using 0.0.0.0 */
                TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
                break;
#endif
#ifdef INET6
        case AF_INET6:
                aa->ap.aph.ph.param_type = SCTP_DEL_IP_ADDRESS;
                aa->ap.aph.ph.param_length = sizeof(struct sctp_asconf_addr_param);
                aa->ap.addrp.ph.param_type = SCTP_IPV6_ADDRESS;
                aa->ap.addrp.ph.param_length = sizeof(struct sctp_ipv6addr_param);
                /* No need to add an address, we are using 0.0.0.0 */
                TAILQ_INSERT_TAIL(&stcb->asoc.asconf_queue, aa, next);
                break;
#endif
        default:
                SCTPDBG(SCTP_DEBUG_ASCONF1,
                    "sctp_asconf_send_nat_state_update: unknown address family\n");
                SCTP_FREE(aa, SCTP_M_ASC_ADDR);
                return;
        }
        /* Now we must hunt the addresses and add all global addresses */
        if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUNDALL) {
                struct sctp_vrf *vrf = NULL;
                struct sctp_ifn *sctp_ifnp;
                uint32_t vrf_id;

                vrf_id = stcb->sctp_ep->def_vrf_id;
                vrf = sctp_find_vrf(vrf_id);
                if (vrf == NULL) {
                        goto skip_rest;
                }

                SCTP_IPI_ADDR_RLOCK();
                LIST_FOREACH(sctp_ifnp, &vrf->ifnlist, next_ifn) {
                        LIST_FOREACH(sctp_ifap, &sctp_ifnp->ifalist, next_ifa) {
                                switch (sctp_ifap->address.sa.sa_family) {
#ifdef INET
                                case AF_INET:
                                        to = &sctp_ifap->address.sin;
                                        if (prison_check_ip4(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                            &to->sin_addr) != 0) {
                                                continue;
                                        }
                                        if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
                                                continue;
                                        }
                                        if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
                                                continue;
                                        }
                                        break;
#endif
#ifdef INET6
                                case AF_INET6:
                                        to6 = &sctp_ifap->address.sin6;
                                        if (prison_check_ip6(stcb->sctp_ep->ip_inp.inp.inp_cred,
                                            &to6->sin6_addr) != 0) {
                                                continue;
                                        }
                                        if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
                                                continue;
                                        }
                                        if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
                                                continue;
                                        }
                                        break;
#endif
                                default:
                                        continue;
                                }
                                sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
                        }
                }
                SCTP_IPI_ADDR_RUNLOCK();
        } else {
                struct sctp_laddr *laddr;

                LIST_FOREACH(laddr, &stcb->sctp_ep->sctp_addr_list, sctp_nxt_addr) {
                        if (laddr->ifa == NULL) {
                                continue;
                        }
                        if (laddr->ifa->localifa_flags & SCTP_BEING_DELETED)
                                /*
                                 * Address being deleted by the system, dont
                                 * list.
                                 */
                                continue;
                        if (laddr->action == SCTP_DEL_IP_ADDRESS) {
                                /*
                                 * Address being deleted on this ep don't
                                 * list.
                                 */
                                continue;
                        }
                        sctp_ifap = laddr->ifa;
                        switch (sctp_ifap->address.sa.sa_family) {
#ifdef INET
                        case AF_INET:
                                to = &sctp_ifap->address.sin;
                                if (IN4_ISPRIVATE_ADDRESS(&to->sin_addr)) {
                                        continue;
                                }
                                if (IN4_ISLOOPBACK_ADDRESS(&to->sin_addr)) {
                                        continue;
                                }
                                break;
#endif
#ifdef INET6
                        case AF_INET6:
                                to6 = &sctp_ifap->address.sin6;
                                if (IN6_IS_ADDR_LOOPBACK(&to6->sin6_addr)) {
                                        continue;
                                }
                                if (IN6_IS_ADDR_LINKLOCAL(&to6->sin6_addr)) {
                                        continue;
                                }
                                break;
#endif
                        default:
                                continue;
                        }
                        sctp_asconf_queue_mgmt(stcb, sctp_ifap, SCTP_ADD_IP_ADDRESS);
                }
        }
skip_rest:
        /* Now we must send the asconf into the queue */
        sctp_send_asconf(stcb, net, SCTP_ADDR_NOT_LOCKED);
}