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_clone.h>
   52 #include <net/if_types.h>
   53 #include <net/route.h>
   54 #include <net/bpf.h>
   55 #include <net/vnet.h>
   56 
   57 #include "opt_inet.h"
   58 #include "opt_inet6.h"
   59 
   60 #ifdef TINY_DSMTU
   61 #define DSMTU   (1024+512)
   62 #else
   63 #define DSMTU   65532
   64 #endif
   65 
   66 struct disc_softc {
   67         struct ifnet *sc_ifp;
   68 };
   69 
   70 static int      discoutput(struct ifnet *, struct mbuf *,
   71                     const struct sockaddr *, struct route *);
   72 static int      discioctl(struct ifnet *, u_long, caddr_t);
   73 static int      disc_clone_create(struct if_clone *, int, caddr_t);
   74 static void     disc_clone_destroy(struct ifnet *);
   75 
   76 static const char discname[] = "disc";
   77 static MALLOC_DEFINE(M_DISC, discname, "Discard interface");
   78 
   79 VNET_DEFINE_STATIC(struct if_clone *, disc_cloner);
   80 #define V_disc_cloner   VNET(disc_cloner)
   81 
   82 static int
   83 disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   84 {
   85         struct ifnet            *ifp;
   86         struct disc_softc       *sc;
   87 
   88         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   89         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   90         if (ifp == NULL) {
   91                 free(sc, M_DISC);
   92                 return (ENOSPC);
   93         }
   94 
   95         ifp->if_softc = sc;
   96         if_initname(ifp, discname, unit);
   97         ifp->if_mtu = DSMTU;
   98         /*
   99          * IFF_LOOPBACK should not be removed from disc's flags because
  100          * it controls what PF-specific routes are magically added when
  101          * a network address is assigned to the interface.  Things just
  102          * won't work as intended w/o such routes because the output
  103          * interface selection for a packet is totally route-driven.
  104          * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
  105          * IFF_POINTOPOINT, but it would result in different properties
  106          * of the interface.
  107          */
  108         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  109         ifp->if_drv_flags = IFF_DRV_RUNNING;
  110         ifp->if_ioctl = discioctl;
  111         ifp->if_output = discoutput;
  112         ifp->if_hdrlen = 0;
  113         ifp->if_addrlen = 0;
  114         ifp->if_snd.ifq_maxlen = 20;
  115         if_attach(ifp);
  116         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  117 
  118         return (0);
  119 }
  120 
  121 static void
  122 disc_clone_destroy(struct ifnet *ifp)
  123 {
  124         struct disc_softc       *sc;
  125 
  126         sc = ifp->if_softc;
  127 
  128         bpfdetach(ifp);
  129         if_detach(ifp);
  130         if_free(ifp);
  131 
  132         free(sc, M_DISC);
  133 }
  134 
  135 static void
  136 vnet_disc_init(const void *unused __unused)
  137 {
  138 
  139         V_disc_cloner = if_clone_simple(discname, disc_clone_create,
  140             disc_clone_destroy, 0);
  141 }
  142 VNET_SYSINIT(vnet_disc_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  143     vnet_disc_init, NULL);
  144 
  145 static void
  146 vnet_disc_uninit(const void *unused __unused)
  147 {
  148 
  149         if_clone_detach(V_disc_cloner);
  150 }
  151 VNET_SYSUNINIT(vnet_disc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  152     vnet_disc_uninit, NULL);
  153 
  154 static int
  155 disc_modevent(module_t mod, int type, void *data)
  156 {
  157 
  158         switch (type) {
  159         case MOD_LOAD:
  160         case MOD_UNLOAD:
  161                 break;
  162         default:
  163                 return (EOPNOTSUPP);
  164         }
  165         return (0);
  166 }
  167 
  168 static moduledata_t disc_mod = {
  169         "if_disc",
  170         disc_modevent,
  171         NULL
  172 };
  173 
  174 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  175 
  176 static int
  177 discoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  178     struct route *ro)
  179 {
  180         u_int32_t af;
  181 
  182         M_ASSERTPKTHDR(m);
  183 
  184         /* BPF writes need to be handled specially. */
  185         if (dst->sa_family == AF_UNSPEC)
  186                 bcopy(dst->sa_data, &af, sizeof(af));
  187         else
  188                 af = dst->sa_family;
  189 
  190         if (bpf_peers_present(ifp->if_bpf))
  191                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  192 
  193         m->m_pkthdr.rcvif = ifp;
  194 
  195         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  196         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  197 
  198         m_freem(m);
  199         return (0);
  200 }
  201 
  202 /*
  203  * Process an ioctl request.
  204  */
  205 static int
  206 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  207 {
  208         struct ifreq *ifr = (struct ifreq *)data;
  209         int error = 0;
  210 
  211         switch (cmd) {
  212         case SIOCSIFADDR:
  213                 ifp->if_flags |= IFF_UP;
  214 
  215                 /*
  216                  * Everything else is done at a higher level.
  217                  */
  218                 break;
  219         case SIOCADDMULTI:
  220         case SIOCDELMULTI:
  221                 if (ifr == NULL) {
  222                         error = EAFNOSUPPORT;           /* XXX */
  223                         break;
  224                 }
  225                 switch (ifr->ifr_addr.sa_family) {
  226 #ifdef INET
  227                 case AF_INET:
  228                         break;
  229 #endif
  230 #ifdef INET6
  231                 case AF_INET6:
  232                         break;
  233 #endif
  234                 default:
  235                         error = EAFNOSUPPORT;
  236                         break;
  237                 }
  238                 break;
  239         case SIOCSIFMTU:
  240                 ifp->if_mtu = ifr->ifr_mtu;
  241                 break;
  242         default:
  243                 error = EINVAL;
  244         }
  245         return (error);
  246 }

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

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sys/net/if_disc.c