if_disc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      From: @(#)if_loop.c     8.1 (Berkeley) 6/10/93
   32  * $FreeBSD$
   33  */
   34 
   35 /*
   36  * Discard interface driver for protocol testing and timing.
   37  * (Based on the loopback.)
   38  */
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/kernel.h>
   43 #include <sys/malloc.h>
   44 #include <sys/module.h>
   45 #include <sys/mbuf.h>
   46 #include <sys/socket.h>
   47 #include <sys/sockio.h>
   48 
   49 #include <net/if.h>
   50 #include <net/if_var.h>
   51 #include <net/if_private.h>
   52 #include <net/if_clone.h>
   53 #include <net/if_types.h>
   54 #include <net/route.h>
   55 #include <net/bpf.h>
   56 #include <net/vnet.h>
   57 
   58 #include "opt_inet.h"
   59 #include "opt_inet6.h"
   60 
   61 #ifdef TINY_DSMTU
   62 #define DSMTU   (1024+512)
   63 #else
   64 #define DSMTU   65532
   65 #endif
   66 
   67 struct disc_softc {
   68         struct ifnet *sc_ifp;
   69 };
   70 
   71 static int      discoutput(struct ifnet *, struct mbuf *,
   72                     const struct sockaddr *, struct route *);
   73 static int      discioctl(struct ifnet *, u_long, caddr_t);
   74 static int      disc_clone_create(struct if_clone *, int, caddr_t);
   75 static void     disc_clone_destroy(struct ifnet *);
   76 
   77 static const char discname[] = "disc";
   78 static MALLOC_DEFINE(M_DISC, discname, "Discard interface");
   79 
   80 VNET_DEFINE_STATIC(struct if_clone *, disc_cloner);
   81 #define V_disc_cloner   VNET(disc_cloner)
   82 
   83 static int
   84 disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   85 {
   86         struct ifnet            *ifp;
   87         struct disc_softc       *sc;
   88 
   89         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   90         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   91         if (ifp == NULL) {
   92                 free(sc, M_DISC);
   93                 return (ENOSPC);
   94         }
   95 
   96         ifp->if_softc = sc;
   97         if_initname(ifp, discname, unit);
   98         ifp->if_mtu = DSMTU;
   99         /*
  100          * IFF_LOOPBACK should not be removed from disc's flags because
  101          * it controls what PF-specific routes are magically added when
  102          * a network address is assigned to the interface.  Things just
  103          * won't work as intended w/o such routes because the output
  104          * interface selection for a packet is totally route-driven.
  105          * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
  106          * IFF_POINTOPOINT, but it would result in different properties
  107          * of the interface.
  108          */
  109         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  110         ifp->if_drv_flags = IFF_DRV_RUNNING;
  111         ifp->if_ioctl = discioctl;
  112         ifp->if_output = discoutput;
  113         ifp->if_hdrlen = 0;
  114         ifp->if_addrlen = 0;
  115         ifp->if_snd.ifq_maxlen = 20;
  116         if_attach(ifp);
  117         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  118 
  119         return (0);
  120 }
  121 
  122 static void
  123 disc_clone_destroy(struct ifnet *ifp)
  124 {
  125         struct disc_softc       *sc;
  126 
  127         sc = ifp->if_softc;
  128 
  129         bpfdetach(ifp);
  130         if_detach(ifp);
  131         if_free(ifp);
  132 
  133         free(sc, M_DISC);
  134 }
  135 
  136 static void
  137 vnet_disc_init(const void *unused __unused)
  138 {
  139 
  140         V_disc_cloner = if_clone_simple(discname, disc_clone_create,
  141             disc_clone_destroy, 0);
  142 }
  143 VNET_SYSINIT(vnet_disc_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  144     vnet_disc_init, NULL);
  145 
  146 static void
  147 vnet_disc_uninit(const void *unused __unused)
  148 {
  149 
  150         if_clone_detach(V_disc_cloner);
  151 }
  152 VNET_SYSUNINIT(vnet_disc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  153     vnet_disc_uninit, NULL);
  154 
  155 static int
  156 disc_modevent(module_t mod, int type, void *data)
  157 {
  158 
  159         switch (type) {
  160         case MOD_LOAD:
  161         case MOD_UNLOAD:
  162                 break;
  163         default:
  164                 return (EOPNOTSUPP);
  165         }
  166         return (0);
  167 }
  168 
  169 static moduledata_t disc_mod = {
  170         "if_disc",
  171         disc_modevent,
  172         NULL
  173 };
  174 
  175 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  176 
  177 static int
  178 discoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  179     struct route *ro)
  180 {
  181         u_int32_t af;
  182 
  183         M_ASSERTPKTHDR(m);
  184 
  185         /* BPF writes need to be handled specially. */
  186         if (dst->sa_family == AF_UNSPEC)
  187                 bcopy(dst->sa_data, &af, sizeof(af));
  188         else
  189                 af = RO_GET_FAMILY(ro, dst);
  190 
  191         if (bpf_peers_present(ifp->if_bpf))
  192                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  193 
  194         m->m_pkthdr.rcvif = ifp;
  195 
  196         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  197         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  198 
  199         m_freem(m);
  200         return (0);
  201 }
  202 
  203 /*
  204  * Process an ioctl request.
  205  */
  206 static int
  207 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  208 {
  209         struct ifreq *ifr = (struct ifreq *)data;
  210         int error = 0;
  211 
  212         switch (cmd) {
  213         case SIOCSIFADDR:
  214                 ifp->if_flags |= IFF_UP;
  215 
  216                 /*
  217                  * Everything else is done at a higher level.
  218                  */
  219                 break;
  220         case SIOCADDMULTI:
  221         case SIOCDELMULTI:
  222                 if (ifr == NULL) {
  223                         error = EAFNOSUPPORT;           /* XXX */
  224                         break;
  225                 }
  226                 switch (ifr->ifr_addr.sa_family) {
  227 #ifdef INET
  228                 case AF_INET:
  229                         break;
  230 #endif
  231 #ifdef INET6
  232                 case AF_INET6:
  233                         break;
  234 #endif
  235                 default:
  236                         error = EAFNOSUPPORT;
  237                         break;
  238                 }
  239                 break;
  240         case SIOCSIFMTU:
  241                 ifp->if_mtu = ifr->ifr_mtu;
  242                 break;
  243         default:
  244                 error = EINVAL;
  245         }
  246         return (error);
  247 }

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FreeBSD/Linux Kernel Cross Reference sys/net/if_disc.c

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sys/net/if_disc.c