/*      $OpenBSD: virtual.c,v 1.33 2019/06/28 13:32:44 deraadt Exp $    */

/*
 * Copyright (c) 2004 Håkan Olsson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <limits.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "conf.h"
#include "if.h"
#include "exchange.h"
#include "log.h"
#include "message.h"
#include "nat_traversal.h"
#include "transport.h"
#include "virtual.h"
#include "udp.h"
#include "util.h"

#include "udp_encap.h"

static struct transport *virtual_bind(const struct sockaddr *);
static struct transport *virtual_bind_ADDR_ANY(sa_family_t);
static int               virtual_bind_if(char *, struct sockaddr *, void *);
static struct transport *virtual_clone(struct transport *, struct sockaddr *);
static struct transport *virtual_create(char *);
static char             *virtual_decode_ids (struct transport *);
static void              virtual_get_dst(struct transport *,
                             struct sockaddr **);
static struct msg_head  *virtual_get_queue(struct message *);
static void              virtual_get_src(struct transport *,
                             struct sockaddr **);
static void              virtual_handle_message(struct transport *);
static void              virtual_reinit(void);
static void              virtual_remove(struct transport *);
static void              virtual_report(struct transport *);
static int               virtual_send_message(struct message *,
                             struct transport *);

static struct transport_vtbl virtual_transport_vtbl = {
        { 0 }, "udp",
        virtual_create,
        virtual_reinit,
        virtual_remove,
        virtual_report,
        0,
        0,
        virtual_handle_message,
        virtual_send_message,
        virtual_get_dst,
        virtual_get_src,
        virtual_decode_ids,
        virtual_clone,
        virtual_get_queue
};

static LIST_HEAD (virtual_listen_list, virtual_transport) virtual_listen_list;
static struct transport *default_transport, *default_transport6;

void
virtual_init(void)
{
        struct conf_list *listen_on;

        LIST_INIT(&virtual_listen_list);

        transport_method_add(&virtual_transport_vtbl);

        /* Bind the ISAKMP port(s) on all network interfaces we have.  */
        if (if_map(virtual_bind_if, 0) == -1)
                log_fatal("virtual_init: "
                    "could not bind the ISAKMP port(s) on all interfaces");

        /* Only listen to the specified address if Listen-on is configured */
        listen_on = conf_get_list("General", "Listen-on");
        if (listen_on) {
                LOG_DBG((LOG_TRANSPORT, 50,
                    "virtual_init: not binding ISAKMP port(s) to ADDR_ANY"));
                conf_free_list(listen_on);
                return;
        }

        /*
         * Bind to INADDR_ANY in case of new addresses popping up.
         * Packet reception on this transport is taken as a hint to reprobe the
         * interface list.
         */
        if (!bind_family || (bind_family & BIND_FAMILY_INET4)) {
                default_transport = virtual_bind_ADDR_ANY(AF_INET);
                if (!default_transport)
                        return;
                LIST_INSERT_HEAD(&virtual_listen_list,
                    (struct virtual_transport *)default_transport, link);
                transport_reference(default_transport);
        }

        if (!bind_family || (bind_family & BIND_FAMILY_INET6)) {
                default_transport6 = virtual_bind_ADDR_ANY(AF_INET6);
                if (!default_transport6)
                        return;
                LIST_INSERT_HEAD(&virtual_listen_list,
                    (struct virtual_transport *)default_transport6, link);
                transport_reference(default_transport6);
        }
}

struct virtual_transport *
virtual_get_default(sa_family_t af)
{
        switch (af) {
        case AF_INET:
                return (struct virtual_transport *)default_transport;
        case AF_INET6:
                return (struct virtual_transport *)default_transport6;
        default:
                return 0;
        }
}

/*
 * Probe the interface list and determine what new interfaces have
 * appeared.
 *
 * At the same time, we try to determine whether existing interfaces have
 * been rendered invalid; we do this by marking all virtual transports before
 * we call virtual_bind_if() through if_map(), and then releasing those
 * transports that have not been unmarked.
 */
void
virtual_reinit(void)
{
        struct virtual_transport *v, *v2;

        /* Mark all UDP transports, except the default ones. */
        for (v = LIST_FIRST(&virtual_listen_list); v; v = LIST_NEXT(v, link))
                if (&v->transport != default_transport &&
                    &v->transport != default_transport6)
                        v->transport.flags |= TRANSPORT_MARK;

        /* Re-probe interface list.  */
        if (if_map(virtual_bind_if, 0) == -1)
                log_print("virtual_init: "
                    "could not bind the ISAKMP port(s) on all interfaces");

        /*
         * Release listening transports for local addresses that no
         * longer exist. virtual_bind_if () will have left those still marked.
         */
        v = LIST_FIRST(&virtual_listen_list);
        while (v) {
                v2 = LIST_NEXT(v, link);
                if (v->transport.flags & TRANSPORT_MARK) {
                        LIST_REMOVE(v, link);
                        transport_release(&v->transport);
                }
                v = v2;
        }
}

struct virtual_transport *
virtual_listen_lookup(struct sockaddr *addr)
{
        struct virtual_transport *v;
        struct udp_transport     *u;

        for (v = LIST_FIRST(&virtual_listen_list); v;
            v = LIST_NEXT(v, link)) {
                if (!(u = (struct udp_transport *)v->main))
                        if (!(u = (struct udp_transport *)v->encap)) {
                                log_print("virtual_listen_lookup: "
                                    "virtual %p has no low-level transports",
                                    v);
                                continue;
                        }

                if (u->src->sa_family == addr->sa_family &&
                    sockaddr_addrlen(u->src) == sockaddr_addrlen(addr) &&
                    memcmp(sockaddr_addrdata (u->src), sockaddr_addrdata(addr),
                    sockaddr_addrlen(addr)) == 0)
                        return v;
        }

        LOG_DBG((LOG_TRANSPORT, 40, "virtual_listen_lookup: no match"));
        return 0;
}

/*
 * Initialize an object of the VIRTUAL transport class.
 */
static struct transport *
virtual_bind(const struct sockaddr *addr)
{
        struct virtual_transport *v;
        struct sockaddr_storage   tmp_sa;
        char    *stport;
        in_port_t port;

        v = calloc(1, sizeof *v);
        if (!v) {
                log_error("virtual_bind: calloc(1, %lu) failed",
                    (unsigned long)sizeof *v);
                return 0;
        }

        v->transport.vtbl = &virtual_transport_vtbl;

        memcpy(&tmp_sa, addr, SA_LEN(addr));

        /* Get port. */
        stport = udp_default_port ? udp_default_port : UDP_DEFAULT_PORT_STR;
        port = text2port(stport);
        if (port == 0) {
                log_print("virtual_bind: bad port \"%s\"", stport);
                free(v);
                return 0;
        }

        sockaddr_set_port((struct sockaddr *)&tmp_sa, port);
        v->main = udp_bind((struct sockaddr *)&tmp_sa);
        if (!v->main) {
                free(v);
                return 0;
        }
        v->main->virtual = (struct transport *)v;

        if (!disable_nat_t) {
                memcpy(&tmp_sa, addr, SA_LEN(addr));

                /* Get port. */
                stport = udp_encap_default_port
                    ? udp_encap_default_port : UDP_ENCAP_DEFAULT_PORT_STR;
                port = text2port(stport);
                if (port == 0) {
                        log_print("virtual_bind: bad encap port \"%s\"",
                            stport);
                        v->main->vtbl->remove(v->main);
                        free(v);
                        return 0;
                }

                sockaddr_set_port((struct sockaddr *)&tmp_sa, port);
                v->encap = udp_encap_bind((struct sockaddr *)&tmp_sa);
                if (!v->encap) {
                        v->main->vtbl->remove(v->main);
                        free(v);
                        return 0;
                }
                v->encap->virtual = (struct transport *)v;
        }
        v->encap_is_active = 0;

        transport_setup(&v->transport, 1);
        v->transport.flags |= TRANSPORT_LISTEN;

        return (struct transport *)v;
}

static struct transport *
virtual_bind_ADDR_ANY(sa_family_t af)
{
        struct sockaddr_storage dflt_stor;
        struct sockaddr_in      *d4 = (struct sockaddr_in *)&dflt_stor;
        struct sockaddr_in6     *d6 = (struct sockaddr_in6 *)&dflt_stor;
        struct transport        *t;
        struct in6_addr         in6addr_any = IN6ADDR_ANY_INIT;

        bzero(&dflt_stor, sizeof dflt_stor);
        switch (af) {
        case AF_INET:
                d4->sin_family = af;
                d4->sin_len = sizeof(struct sockaddr_in);
                d4->sin_addr.s_addr = INADDR_ANY;
                break;

        case AF_INET6:
                d6->sin6_family = af;
                d6->sin6_len = sizeof(struct sockaddr_in6);
                memcpy(&d6->sin6_addr.s6_addr, &in6addr_any,
                    sizeof in6addr_any);
                break;
        }

        t = virtual_bind((struct sockaddr *)&dflt_stor);
        if (!t)
                log_error("virtual_bind_ADDR_ANY: "
                    "could not allocate default IPv%s ISAKMP port(s)",
                    af == AF_INET ? "4" : "6");
        return t;
}

static int
virtual_bind_if(char *ifname, struct sockaddr *if_addr, void *arg)
{
        struct conf_list        *listen_on;
        struct virtual_transport *v;
        struct conf_list_node   *address;
        struct sockaddr         *addr;
        struct transport        *t;
        struct ifreq            flags_ifr;
        struct in6_ifreq        flags_ifr6;
        char    *addr_str;
        int      s, error;

        if (sockaddr2text(if_addr, &addr_str, 0))
                addr_str = 0;

        LOG_DBG((LOG_TRANSPORT, 90,
            "virtual_bind_if: interface %s family %s address %s",
            ifname ? ifname : "<unknown>",
            if_addr->sa_family == AF_INET ? "v4" :
            (if_addr->sa_family == AF_INET6 ? "v6" : "<unknown>"),
            addr_str ? addr_str : "<invalid>"));
        free(addr_str);

        /*
         * Drop non-Internet stuff.
         */
        if ((if_addr->sa_family != AF_INET ||
            SA_LEN(if_addr) != sizeof (struct sockaddr_in)) &&
            (if_addr->sa_family != AF_INET6 ||
            SA_LEN(if_addr) != sizeof (struct sockaddr_in6)))
                return 0;

        /*
         * Only create sockets for families we should listen to.
         */
        if (bind_family)
                switch (if_addr->sa_family) {
                case AF_INET:
                        if ((bind_family & BIND_FAMILY_INET4) == 0)
                                return 0;
                        break;
                case AF_INET6:
                        if ((bind_family & BIND_FAMILY_INET6) == 0)
                                return 0;
                        break;
                default:
                        return 0;
                }

        /*
         * These special addresses are not useable as they have special meaning
         * in the IP stack.
         */
        if (if_addr->sa_family == AF_INET &&
            (((struct sockaddr_in *)if_addr)->sin_addr.s_addr == INADDR_ANY ||
            (((struct sockaddr_in *)if_addr)->sin_addr.s_addr == INADDR_NONE)))
                return 0;

        /*
         * Go through the list of transports and see if we already have this
         * address bound. If so, unmark the transport and skip it; this allows
         * us to call this function when we suspect a new address has appeared.
         */
        if ((v = virtual_listen_lookup(if_addr)) != 0) {
                LOG_DBG ((LOG_TRANSPORT, 90, "virtual_bind_if: "
                    "already bound"));
                v->transport.flags &= ~TRANSPORT_MARK;
                return 0;
        }

        /*
         * Don't bother with interfaces that are down.
         * Note: This socket is only used to collect the interface status,
         * rtables and inet6 addresses.
         */
        s = socket(if_addr->sa_family, SOCK_DGRAM, 0);
        if (s == -1) {
                log_error("virtual_bind_if: "
                    "socket (%d, SOCK_DGRAM, 0) failed", if_addr->sa_family);
                return -1;
        }
        strlcpy(flags_ifr.ifr_name, ifname, sizeof flags_ifr.ifr_name);
        if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&flags_ifr) == -1) {
                log_error("virtual_bind_if: "
                    "ioctl (%d, SIOCGIFFLAGS, ...) failed", s);
                close(s);
                return -1;
        }
        if (!(flags_ifr.ifr_flags & IFF_UP)) {
                close(s);
                return 0;
        }
        /* Also skip tentative addresses during DAD since bind(2) would fail. */
        if (if_addr->sa_family == AF_INET6) {
                memset(&flags_ifr6, 0, sizeof(flags_ifr6));
                strlcpy(flags_ifr6.ifr_name, ifname, sizeof flags_ifr6.ifr_name);
                flags_ifr6.ifr_addr = *(struct sockaddr_in6 *)if_addr;
                if (ioctl(s, SIOCGIFAFLAG_IN6, (caddr_t)&flags_ifr6) == -1) {
                        log_error("virtual_bind_if: "
                            "ioctl (%d, SIOCGIFAFLAG_IN6, ...) failed", s);
                        close(s);
                        return 0;
                }
                if (flags_ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_ANYCAST|
                    IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED|IN6_IFF_DETACHED)) {
                        error = sockaddr2text(if_addr, &addr_str, 0);
                        log_print("virtual_bind_if: "
                            "IPv6 address %s not ready (flags 0x%x)",
                            error ? "unknown" : addr_str,
                            flags_ifr6.ifr_ifru.ifru_flags6);
                        /* XXX schedule an interface rescan */
                        if (!error)
                                free(addr_str);
                        close(s);
                        return 0;
                }
        }

        if (ioctl(s, SIOCGIFRDOMAIN, (caddr_t)&flags_ifr) == -1) {
                log_error("virtual_bind_if: "
                    "ioctl (%d, SIOCGIFRDOMAIN, ...) failed", s);
                close(s);
                return -1;
        }

        /*
         * Ignore interfaces outside of our rtable
         */
        if (getrtable() != flags_ifr.ifr_rdomainid) {
                close(s);
                return 0;
        }

        close(s);

        /* Set the port number to zero.  */
        switch (if_addr->sa_family) {
        case AF_INET:
                ((struct sockaddr_in *)if_addr)->sin_port = htons(0);
                break;
        case AF_INET6:
                ((struct sockaddr_in6 *)if_addr)->sin6_port = htons(0);
                break;
        default:
                log_print("virtual_bind_if: unsupported protocol family %d",
                    if_addr->sa_family);
                break;
        }

        /*
         * If we are explicit about what addresses we can listen to, be sure
         * to respect that option.
         * This is quite wasteful redoing the list-run for every interface,
         * but who cares?  This is not an operation that needs to be fast.
         */
        listen_on = conf_get_list("General", "Listen-on");
        if (listen_on) {
                for (address = TAILQ_FIRST(&listen_on->fields); address;
                    address = TAILQ_NEXT(address, link)) {
                        if (text2sockaddr(address->field, 0, &addr, 0, 0)) {
                                log_print("virtual_bind_if: "
                                    "invalid address %s in \"Listen-on\"",
                                    address->field);
                                continue;
                        }

                        /* If found, take the easy way out. */
                        if (memcmp(addr, if_addr, SA_LEN(addr)) == 0) {
                                free(addr);
                                break;
                        }
                        free(addr);
                }
                conf_free_list(listen_on);

                /*
                 * If address is zero then we did not find the address among
                 * the ones we should listen to.
                 * XXX We do not discover if we do not find our listen
                 * addresses. Maybe this should be the other way round.
                 */
                if (!address)
                        return 0;
        }

        t = virtual_bind(if_addr);
        if (!t) {
                error = sockaddr2text(if_addr, &addr_str, 0);
                log_print("virtual_bind_if: failed to create a socket on %s",
                    error ? "unknown" : addr_str);
                if (!error)
                        free(addr_str);
                return -1;
        }
        LIST_INSERT_HEAD(&virtual_listen_list, (struct virtual_transport *)t,
            link);
        transport_reference(t);
        return 0;
}

static struct transport *
virtual_clone(struct transport *vt, struct sockaddr *raddr)
{
        struct virtual_transport *v = (struct virtual_transport *)vt;
        struct virtual_transport *v2;
        struct transport         *t;
        char                     *stport;
        in_port_t                 port;

        t = malloc(sizeof *v);
        if (!t) {
                log_error("virtual_clone: malloc(%lu) failed",
                    (unsigned long)sizeof *v);
                return 0;
        }
        v2 = (struct virtual_transport *)t;

        memcpy(v2, v, sizeof *v);
        /* Remove the copy's links into virtual_listen_list.  */
        memset(&v2->link, 0, sizeof v2->link);

        if (v->encap_is_active)
                v2->main = 0; /* No need to clone this.  */
        else {
                v2->main = v->main->vtbl->clone(v->main, raddr);
                v2->main->virtual = (struct transport *)v2;
        }
        if (!disable_nat_t) {
                stport = udp_encap_default_port ? udp_encap_default_port :
                    UDP_ENCAP_DEFAULT_PORT_STR;
                port = text2port(stport);
                if (port == 0) {
                        log_print("virtual_clone: port string \"%s\" not convertible "
                            "to in_port_t", stport);
                        free(t);
                        return 0;
                }
                sockaddr_set_port(raddr, port);
                v2->encap = v->encap->vtbl->clone(v->encap, raddr);
                v2->encap->virtual = (struct transport *)v2;
        }
        LOG_DBG((LOG_TRANSPORT, 50, "virtual_clone: old %p new %p (%s is %p)",
            v, t, v->encap_is_active ? "encap" : "main",
            v->encap_is_active ? v2->encap : v2->main));

        t->flags &= ~TRANSPORT_LISTEN;
        transport_setup(t, 1);
        return t;
}

static struct transport *
virtual_create(char *name)
{
        struct virtual_transport *v;
        struct transport         *t, *t2 = 0;

        t = transport_create("udp_physical", name);
        if (!t)
                return 0;

        if (!disable_nat_t) {
                t2 = transport_create("udp_encap", name);
                if (!t2) {
                        t->vtbl->remove(t);
                        return 0;
                }
        }

        v = calloc(1, sizeof *v);
        if (!v) {
                log_error("virtual_create: calloc(1, %lu) failed",
                    (unsigned long)sizeof *v);
                t->vtbl->remove(t);
                if (t2)
                        t2->vtbl->remove(t2);
                return 0;
        }

        memcpy(v, t, sizeof *t);
        v->transport.virtual = 0;
        v->main = t;
        v->encap = t2;
        v->transport.vtbl = &virtual_transport_vtbl;
        t->virtual = (struct transport *)v;
        if (t2)
                t2->virtual = (struct transport *)v;
        transport_setup(&v->transport, 1);
        return (struct transport *)v;
}

static void
virtual_remove(struct transport *t)
{
        struct virtual_transport *p, *v = (struct virtual_transport *)t;

        if (v->encap)
                v->encap->vtbl->remove(v->encap);
        if (v->main)
                v->main->vtbl->remove(v->main);

        for (p = LIST_FIRST(&virtual_listen_list); p && p != v; p =
            LIST_NEXT(p, link))
                ;
        if (p == v)
                LIST_REMOVE(v, link);

        LOG_DBG((LOG_TRANSPORT, 90, "virtual_remove: removed %p", v));
        free(t);
}

static void
virtual_report(struct transport *t)
{
}

static void
virtual_handle_message(struct transport *t)
{
        /*
         * As per the NAT-T draft, in case we have already switched ports,
         * any messages received on the old (500) port SHOULD be discarded.
         * (Actually, while phase 1 messages should be discarded,
         *  informational exchanges MAY be processed normally. For now, we
         *  discard them all.)
         */
        if (((struct virtual_transport *)t->virtual)->encap_is_active &&
            ((struct virtual_transport *)t->virtual)->main == t) {
                LOG_DBG((LOG_MESSAGE, 10, "virtual_handle_message: "
                    "message on old port discarded"));
                return;
        }

        t->vtbl->handle_message(t);
}

static int
virtual_send_message(struct message *msg, struct transport *t)
{
        struct virtual_transport *v =
            (struct virtual_transport *)msg->transport;
        struct sockaddr *dst;
        in_port_t port, default_port;

        /*
         * Activate NAT-T Encapsulation if
         *   - the exchange says we can, and
         *   - in ID_PROT, after step 4 (draft-ietf-ipsec-nat-t-ike-03), or
         *   - in other exchange (Aggressive, ), asap
         * XXX ISAKMP_EXCH_BASE etc?
         */

        if (msg->flags & MSG_NATT) {
                msg->exchange->flags |= EXCHANGE_FLAG_NAT_T_ENABLE;
                msg->exchange->flags |= EXCHANGE_FLAG_NAT_T_CAP_PEER;
        }

        if ((v->encap_is_active == 0 &&
            (msg->exchange->flags & EXCHANGE_FLAG_NAT_T_ENABLE) &&
            (msg->exchange->type != ISAKMP_EXCH_ID_PROT ||
                msg->exchange->step > 4)) || (msg->flags & MSG_NATT)) {
                LOG_DBG((LOG_MESSAGE, 10, "virtual_send_message: "
                    "enabling NAT-T encapsulation for this exchange"));
                v->encap_is_active++;

                /* Copy destination port if it is translated (NAT).  */
                v->main->vtbl->get_dst(v->main, &dst);
                port = ntohs(sockaddr_port(dst));

                if (udp_default_port)
                        default_port = text2port(udp_default_port);
                else
                        default_port = UDP_DEFAULT_PORT;
                if (port != default_port) {
                        v->main->vtbl->get_dst(v->encap, &dst);
                        sockaddr_set_port(dst, port);
                }
        }

        if (v->encap_is_active)
                return v->encap->vtbl->send_message(msg, v->encap);
        else
                return v->main->vtbl->send_message(msg, v->main);
}

static void
virtual_get_src(struct transport *t, struct sockaddr **s)
{
        struct virtual_transport *v = (struct virtual_transport *)t;

        if (v->encap_is_active)
                v->encap->vtbl->get_src(v->encap, s);
        else
                v->main->vtbl->get_src(v->main, s);
}

static void
virtual_get_dst(struct transport *t, struct sockaddr **s)
{
        struct virtual_transport *v = (struct virtual_transport *)t;

        if (v->encap_is_active)
                v->encap->vtbl->get_dst(v->encap, s);
        else
                v->main->vtbl->get_dst(v->main, s);
}

static char *
virtual_decode_ids(struct transport *t)
{
        struct virtual_transport *v = (struct virtual_transport *)t;

        if (v->encap_is_active)
                return v->encap->vtbl->decode_ids(t);
        else
                return v->main->vtbl->decode_ids(t);
}

static struct msg_head *
virtual_get_queue(struct message *msg)
{
        if (msg->flags & MSG_PRIORITIZED)
                return &msg->transport->prio_sendq;
        else
                return &msg->transport->sendq;
}