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/8.1/sys/net/if_disc.c 191148 2009-04-16 20:30:28Z kmacy $
   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_clone.h>
   49 #include <net/if_types.h>
   50 #include <net/route.h>
   51 #include <net/bpf.h>
   52 
   53 #include "opt_inet.h"
   54 #include "opt_inet6.h"
   55 
   56 #ifdef TINY_DSMTU
   57 #define DSMTU   (1024+512)
   58 #else
   59 #define DSMTU   65532
   60 #endif
   61 
   62 #define DISCNAME        "disc"
   63 
   64 struct disc_softc {
   65         struct ifnet *sc_ifp;
   66 };
   67 
   68 static int      discoutput(struct ifnet *, struct mbuf *,
   69                     struct sockaddr *, struct route *);
   70 static void     discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   71 static int      discioctl(struct ifnet *, u_long, caddr_t);
   72 static int      disc_clone_create(struct if_clone *, int, caddr_t);
   73 static void     disc_clone_destroy(struct ifnet *);
   74 
   75 static MALLOC_DEFINE(M_DISC, DISCNAME, "Discard interface");
   76 
   77 IFC_SIMPLE_DECLARE(disc, 0);
   78 
   79 static int
   80 disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   81 {
   82         struct ifnet            *ifp;
   83         struct disc_softc       *sc;
   84 
   85         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   86         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   87         if (ifp == NULL) {
   88                 free(sc, M_DISC);
   89                 return (ENOSPC);
   90         }
   91 
   92         ifp->if_softc = sc;
   93         if_initname(ifp, ifc->ifc_name, unit);
   94         ifp->if_mtu = DSMTU;
   95         /*
   96          * IFF_LOOPBACK should not be removed from disc's flags because
   97          * it controls what PF-specific routes are magically added when
   98          * a network address is assigned to the interface.  Things just
   99          * won't work as intended w/o such routes because the output
  100          * interface selection for a packet is totally route-driven.
  101          * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
  102          * IFF_POINTOPOINT, but it would result in different properties
  103          * of the interface.
  104          */
  105         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  106         ifp->if_drv_flags = IFF_DRV_RUNNING;
  107         ifp->if_ioctl = discioctl;
  108         ifp->if_output = discoutput;
  109         ifp->if_hdrlen = 0;
  110         ifp->if_addrlen = 0;
  111         ifp->if_snd.ifq_maxlen = 20;
  112         if_attach(ifp);
  113         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  114 
  115         return (0);
  116 }
  117 
  118 static void
  119 disc_clone_destroy(struct ifnet *ifp)
  120 {
  121         struct disc_softc       *sc;
  122 
  123         sc = ifp->if_softc;
  124 
  125         bpfdetach(ifp);
  126         if_detach(ifp);
  127         if_free(ifp);
  128 
  129         free(sc, M_DISC);
  130 }
  131 
  132 static int
  133 disc_modevent(module_t mod, int type, void *data)
  134 {
  135 
  136         switch (type) {
  137         case MOD_LOAD:
  138                 if_clone_attach(&disc_cloner);
  139                 break;
  140         case MOD_UNLOAD:
  141                 if_clone_detach(&disc_cloner);
  142                 break;
  143         default:
  144                 return (EOPNOTSUPP);
  145         }
  146         return (0);
  147 }
  148 
  149 static moduledata_t disc_mod = {
  150         "if_disc",
  151         disc_modevent,
  152         NULL
  153 };
  154 
  155 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  156 
  157 static int
  158 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  159     struct route *ro)
  160 {
  161         u_int32_t af;
  162 
  163         M_ASSERTPKTHDR(m);
  164 
  165         /* BPF writes need to be handled specially. */
  166         if (dst->sa_family == AF_UNSPEC) {
  167                 bcopy(dst->sa_data, &af, sizeof(af));
  168                 dst->sa_family = af;
  169         }
  170 
  171         if (bpf_peers_present(ifp->if_bpf)) {
  172                 u_int af = dst->sa_family;
  173                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  174         }
  175         m->m_pkthdr.rcvif = ifp;
  176 
  177         ifp->if_opackets++;
  178         ifp->if_obytes += m->m_pkthdr.len;
  179 
  180         m_freem(m);
  181         return (0);
  182 }
  183 
  184 /* ARGSUSED */
  185 static void
  186 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  187 {
  188         RT_LOCK_ASSERT(rt);
  189         rt->rt_rmx.rmx_mtu = DSMTU;
  190 }
  191 
  192 /*
  193  * Process an ioctl request.
  194  */
  195 static int
  196 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  197 {
  198         struct ifaddr *ifa;
  199         struct ifreq *ifr = (struct ifreq *)data;
  200         int error = 0;
  201 
  202         switch (cmd) {
  203 
  204         case SIOCSIFADDR:
  205                 ifp->if_flags |= IFF_UP;
  206                 ifa = (struct ifaddr *)data;
  207                 if (ifa != 0)
  208                         ifa->ifa_rtrequest = discrtrequest;
  209                 /*
  210                  * Everything else is done at a higher level.
  211                  */
  212                 break;
  213 
  214         case SIOCADDMULTI:
  215         case SIOCDELMULTI:
  216                 if (ifr == 0) {
  217                         error = EAFNOSUPPORT;           /* XXX */
  218                         break;
  219                 }
  220                 switch (ifr->ifr_addr.sa_family) {
  221 
  222 #ifdef INET
  223                 case AF_INET:
  224                         break;
  225 #endif
  226 #ifdef INET6
  227                 case AF_INET6:
  228                         break;
  229 #endif
  230 
  231                 default:
  232                         error = EAFNOSUPPORT;
  233                         break;
  234                 }
  235                 break;
  236 
  237         case SIOCSIFMTU:
  238                 ifp->if_mtu = ifr->ifr_mtu;
  239                 break;
  240 
  241         default:
  242                 error = EINVAL;
  243         }
  244         return (error);
  245 }

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