The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      From: @(#)if_loop.c     8.1 (Berkeley) 6/10/93
   30  * $FreeBSD: releng/11.1/sys/net/if_disc.c 302054 2016-06-21 13:48:49Z bz $
   31  */
   32 
   33 /*
   34  * Discard interface driver for protocol testing and timing.
   35  * (Based on the loopback.)
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/kernel.h>
   41 #include <sys/malloc.h>
   42 #include <sys/module.h>
   43 #include <sys/mbuf.h>
   44 #include <sys/socket.h>
   45 #include <sys/sockio.h>
   46 
   47 #include <net/if.h>
   48 #include <net/if_var.h>
   49 #include <net/if_clone.h>
   50 #include <net/if_types.h>
   51 #include <net/route.h>
   52 #include <net/bpf.h>
   53 #include <net/vnet.h>
   54 
   55 #include "opt_inet.h"
   56 #include "opt_inet6.h"
   57 
   58 #ifdef TINY_DSMTU
   59 #define DSMTU   (1024+512)
   60 #else
   61 #define DSMTU   65532
   62 #endif
   63 
   64 struct disc_softc {
   65         struct ifnet *sc_ifp;
   66 };
   67 
   68 static int      discoutput(struct ifnet *, struct mbuf *,
   69                     const struct sockaddr *, struct route *);
   70 static int      discioctl(struct ifnet *, u_long, caddr_t);
   71 static int      disc_clone_create(struct if_clone *, int, caddr_t);
   72 static void     disc_clone_destroy(struct ifnet *);
   73 
   74 static const char discname[] = "disc";
   75 static MALLOC_DEFINE(M_DISC, discname, "Discard interface");
   76 
   77 static VNET_DEFINE(struct if_clone *, disc_cloner);
   78 #define V_disc_cloner   VNET(disc_cloner)
   79 
   80 static int
   81 disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   82 {
   83         struct ifnet            *ifp;
   84         struct disc_softc       *sc;
   85 
   86         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   87         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   88         if (ifp == NULL) {
   89                 free(sc, M_DISC);
   90                 return (ENOSPC);
   91         }
   92 
   93         ifp->if_softc = sc;
   94         if_initname(ifp, discname, unit);
   95         ifp->if_mtu = DSMTU;
   96         /*
   97          * IFF_LOOPBACK should not be removed from disc's flags because
   98          * it controls what PF-specific routes are magically added when
   99          * a network address is assigned to the interface.  Things just
  100          * won't work as intended w/o such routes because the output
  101          * interface selection for a packet is totally route-driven.
  102          * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
  103          * IFF_POINTOPOINT, but it would result in different properties
  104          * of the interface.
  105          */
  106         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  107         ifp->if_drv_flags = IFF_DRV_RUNNING;
  108         ifp->if_ioctl = discioctl;
  109         ifp->if_output = discoutput;
  110         ifp->if_hdrlen = 0;
  111         ifp->if_addrlen = 0;
  112         ifp->if_snd.ifq_maxlen = 20;
  113         if_attach(ifp);
  114         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  115 
  116         return (0);
  117 }
  118 
  119 static void
  120 disc_clone_destroy(struct ifnet *ifp)
  121 {
  122         struct disc_softc       *sc;
  123 
  124         sc = ifp->if_softc;
  125 
  126         bpfdetach(ifp);
  127         if_detach(ifp);
  128         if_free(ifp);
  129 
  130         free(sc, M_DISC);
  131 }
  132 
  133 static void
  134 vnet_disc_init(const void *unused __unused)
  135 {
  136 
  137         V_disc_cloner = if_clone_simple(discname, disc_clone_create,
  138             disc_clone_destroy, 0);
  139 }
  140 VNET_SYSINIT(vnet_disc_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
  141     vnet_disc_init, NULL);
  142 
  143 static void
  144 vnet_disc_uninit(const void *unused __unused)
  145 {
  146 
  147         if_clone_detach(V_disc_cloner);
  148 }
  149 VNET_SYSUNINIT(vnet_disc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
  150     vnet_disc_uninit, NULL);
  151 
  152 static int
  153 disc_modevent(module_t mod, int type, void *data)
  154 {
  155 
  156         switch (type) {
  157         case MOD_LOAD:
  158         case MOD_UNLOAD:
  159                 break;
  160         default:
  161                 return (EOPNOTSUPP);
  162         }
  163         return (0);
  164 }
  165 
  166 static moduledata_t disc_mod = {
  167         "if_disc",
  168         disc_modevent,
  169         NULL
  170 };
  171 
  172 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  173 
  174 static int
  175 discoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
  176     struct route *ro)
  177 {
  178         u_int32_t af;
  179 
  180         M_ASSERTPKTHDR(m);
  181 
  182         /* BPF writes need to be handled specially. */
  183         if (dst->sa_family == AF_UNSPEC)
  184                 bcopy(dst->sa_data, &af, sizeof(af));
  185         else
  186                 af = dst->sa_family;
  187 
  188         if (bpf_peers_present(ifp->if_bpf))
  189                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  190 
  191         m->m_pkthdr.rcvif = ifp;
  192 
  193         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  194         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
  195 
  196         m_freem(m);
  197         return (0);
  198 }
  199 
  200 /*
  201  * Process an ioctl request.
  202  */
  203 static int
  204 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  205 {
  206         struct ifreq *ifr = (struct ifreq *)data;
  207         int error = 0;
  208 
  209         switch (cmd) {
  210         case SIOCSIFADDR:
  211                 ifp->if_flags |= IFF_UP;
  212 
  213                 /*
  214                  * Everything else is done at a higher level.
  215                  */
  216                 break;
  217         case SIOCADDMULTI:
  218         case SIOCDELMULTI:
  219                 if (ifr == NULL) {
  220                         error = EAFNOSUPPORT;           /* XXX */
  221                         break;
  222                 }
  223                 switch (ifr->ifr_addr.sa_family) {
  224 #ifdef INET
  225                 case AF_INET:
  226                         break;
  227 #endif
  228 #ifdef INET6
  229                 case AF_INET6:
  230                         break;
  231 #endif
  232                 default:
  233                         error = EAFNOSUPPORT;
  234                         break;
  235                 }
  236                 break;
  237         case SIOCSIFMTU:
  238                 ifp->if_mtu = ifr->ifr_mtu;
  239                 break;
  240         default:
  241                 error = EINVAL;
  242         }
  243         return (error);
  244 }

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