source: rtems-libbsd/freebsd/sys/net/if_faith.c @ 3d1e767

#include <machine/rtems-bsd-kernel-space.h>

/*      $KAME: if_faith.c,v 1.23 2001/12/17 13:55:29 sumikawa Exp $     */

/*-
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  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.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 * $FreeBSD$
 */
/*
 * derived from
 *      @(#)if_loop.c   8.1 (Berkeley) 6/10/93
 * Id: if_loop.c,v 1.22 1996/06/19 16:24:10 wollman Exp
 */

/*
 * Loopback interface driver for protocol testing and timing.
 */
#include <rtems/bsd/local/opt_inet.h>
#include <rtems/bsd/local/opt_inet6.h>

#include <rtems/bsd/sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <rtems/bsd/sys/errno.h>
#include <sys/sockio.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/malloc.h>

#include <net/if.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/vnet.h>

#ifdef  INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif

#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#endif

#define FAITHNAME       "faith"

struct faith_softc {
        struct ifnet *sc_ifp;
};

static int faithioctl(struct ifnet *, u_long, caddr_t);
int faithoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
        struct route *);
static void faithrtrequest(int, struct rtentry *, struct rt_addrinfo *);
#ifdef INET6
static int faithprefix(struct in6_addr *);
#endif

static int faithmodevent(module_t, int, void *);

static MALLOC_DEFINE(M_FAITH, FAITHNAME, "Firewall Assisted Tunnel Interface");

static int      faith_clone_create(struct if_clone *, int, caddr_t);
static void     faith_clone_destroy(struct ifnet *);

IFC_SIMPLE_DECLARE(faith, 0);

#define FAITHMTU        1500

static int
faithmodevent(mod, type, data)
        module_t mod;
        int type;
        void *data;
{

        switch (type) {
        case MOD_LOAD:
                if_clone_attach(&faith_cloner);

#ifdef INET6
                faithprefix_p = faithprefix;
#endif

                break;
        case MOD_UNLOAD:
#ifdef INET6
                faithprefix_p = NULL;
#endif

                if_clone_detach(&faith_cloner);
                break;
        default:
                return EOPNOTSUPP;
        }
        return 0;
}

static moduledata_t faith_mod = {
        "if_faith",
        faithmodevent,
        0
};

DECLARE_MODULE(if_faith, faith_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(if_faith, 1);

static int
faith_clone_create(ifc, unit, params)
        struct if_clone *ifc;
        int unit;
        caddr_t params;
{
        struct ifnet *ifp;
        struct faith_softc *sc;

        sc = malloc(sizeof(struct faith_softc), M_FAITH, M_WAITOK | M_ZERO);
        ifp = sc->sc_ifp = if_alloc(IFT_FAITH);
        if (ifp == NULL) {
                free(sc, M_FAITH);
                return (ENOSPC);
        }

        ifp->if_softc = sc;
        if_initname(sc->sc_ifp, ifc->ifc_name, unit);

        ifp->if_mtu = FAITHMTU;
        /* Change to BROADCAST experimentaly to announce its prefix. */
        ifp->if_flags = /* IFF_LOOPBACK */ IFF_BROADCAST | IFF_MULTICAST;
        ifp->if_ioctl = faithioctl;
        ifp->if_output = faithoutput;
        ifp->if_hdrlen = 0;
        ifp->if_addrlen = 0;
        ifp->if_snd.ifq_maxlen = ifqmaxlen;
        if_attach(ifp);
        bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
        return (0);
}

static void
faith_clone_destroy(ifp)
        struct ifnet *ifp;
{
        struct faith_softc *sc = ifp->if_softc;

        bpfdetach(ifp);
        if_detach(ifp);
        if_free(ifp);
        free(sc, M_FAITH);
}

int
faithoutput(ifp, m, dst, ro)
        struct ifnet *ifp;
        struct mbuf *m;
        struct sockaddr *dst;
        struct route *ro;
{
        int isr;
        u_int32_t af;
        struct rtentry *rt = NULL;

        M_ASSERTPKTHDR(m);

        if (ro != NULL)
                rt = ro->ro_rt;
        /* BPF writes need to be handled specially. */
        if (dst->sa_family == AF_UNSPEC) {
                bcopy(dst->sa_data, &af, sizeof(af));
                dst->sa_family = af;
        }

        if (bpf_peers_present(ifp->if_bpf)) {
                af = dst->sa_family;
                bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
        }

        if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
                m_freem(m);
                return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
                        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
        }
        ifp->if_opackets++;
        ifp->if_obytes += m->m_pkthdr.len;
        switch (dst->sa_family) {
#ifdef INET
        case AF_INET:
                isr = NETISR_IP;
                break;
#endif
#ifdef INET6
        case AF_INET6:
                isr = NETISR_IPV6;
                break;
#endif
        default:
                m_freem(m);
                return EAFNOSUPPORT;
        }

        /* XXX do we need more sanity checks? */

        m->m_pkthdr.rcvif = ifp;
        ifp->if_ipackets++;
        ifp->if_ibytes += m->m_pkthdr.len;
        netisr_dispatch(isr, m);
        return (0);
}

/* ARGSUSED */
static void
faithrtrequest(cmd, rt, info)
        int cmd;
        struct rtentry *rt;
        struct rt_addrinfo *info;
{
        RT_LOCK_ASSERT(rt);
        rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
}

/*
 * Process an ioctl request.
 */
/* ARGSUSED */
static int
faithioctl(ifp, cmd, data)
        struct ifnet *ifp;
        u_long cmd;
        caddr_t data;
{
        struct ifaddr *ifa;
        struct ifreq *ifr = (struct ifreq *)data;
        int error = 0;

        switch (cmd) {

        case SIOCSIFADDR:
                ifp->if_flags |= IFF_UP;
                ifp->if_drv_flags |= IFF_DRV_RUNNING;
                ifa = (struct ifaddr *)data;
                ifa->ifa_rtrequest = faithrtrequest;
                /*
                 * Everything else is done at a higher level.
                 */
                break;

        case SIOCADDMULTI:
        case SIOCDELMULTI:
                if (ifr == 0) {
                        error = EAFNOSUPPORT;           /* XXX */
                        break;
                }
                switch (ifr->ifr_addr.sa_family) {
#ifdef INET
                case AF_INET:
                        break;
#endif
#ifdef INET6
                case AF_INET6:
                        break;
#endif

                default:
                        error = EAFNOSUPPORT;
                        break;
                }
                break;

#ifdef SIOCSIFMTU
        case SIOCSIFMTU:
                ifp->if_mtu = ifr->ifr_mtu;
                break;
#endif

        case SIOCSIFFLAGS:
                break;

        default:
                error = EINVAL;
        }
        return (error);
}

#ifdef INET6
/*
 * XXX could be slow
 * XXX could be layer violation to call sys/net from sys/netinet6
 */
static int
faithprefix(in6)
        struct in6_addr *in6;
{
        struct rtentry *rt;
        struct sockaddr_in6 sin6;
        int ret;

        if (V_ip6_keepfaith == 0)
                return 0;

        bzero(&sin6, sizeof(sin6));
        sin6.sin6_family = AF_INET6;
        sin6.sin6_len = sizeof(struct sockaddr_in6);
        sin6.sin6_addr = *in6;
        rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL, RT_DEFAULT_FIB);
        if (rt && rt->rt_ifp && rt->rt_ifp->if_type == IFT_FAITH &&
            (rt->rt_ifp->if_flags & IFF_UP) != 0)
                ret = 1;
        else
                ret = 0;
        if (rt)
                RTFREE_LOCKED(rt);
        return ret;
}
#endif