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/7.4/sys/net/if_disc.c 167897 2007-03-26 09:10:28Z yar $
   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 rtentry *);
   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         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
   96         ifp->if_drv_flags = IFF_DRV_RUNNING;
   97         ifp->if_ioctl = discioctl;
   98         ifp->if_output = discoutput;
   99         ifp->if_hdrlen = 0;
  100         ifp->if_addrlen = 0;
  101         ifp->if_snd.ifq_maxlen = 20;
  102         if_attach(ifp);
  103         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  104 
  105         return (0);
  106 }
  107 
  108 static void
  109 disc_clone_destroy(struct ifnet *ifp)
  110 {
  111         struct disc_softc       *sc;
  112 
  113         sc = ifp->if_softc;
  114 
  115         bpfdetach(ifp);
  116         if_detach(ifp);
  117         if_free(ifp);
  118 
  119         free(sc, M_DISC);
  120 }
  121 
  122 static int
  123 disc_modevent(module_t mod, int type, void *data)
  124 {
  125 
  126         switch (type) {
  127         case MOD_LOAD:
  128                 if_clone_attach(&disc_cloner);
  129                 break;
  130         case MOD_UNLOAD:
  131                 if_clone_detach(&disc_cloner);
  132                 break;
  133         default:
  134                 return (EOPNOTSUPP);
  135         }
  136         return (0);
  137 }
  138 
  139 static moduledata_t disc_mod = {
  140         "if_disc",
  141         disc_modevent,
  142         NULL
  143 };
  144 
  145 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  146 
  147 static int
  148 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  149     struct rtentry *rt)
  150 {
  151         u_int32_t af;
  152 
  153         M_ASSERTPKTHDR(m);
  154 
  155         /* BPF writes need to be handled specially. */
  156         if (dst->sa_family == AF_UNSPEC) {
  157                 bcopy(dst->sa_data, &af, sizeof(af));
  158                 dst->sa_family = af;
  159         }
  160 
  161         if (bpf_peers_present(ifp->if_bpf)) {
  162                 u_int af = dst->sa_family;
  163                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  164         }
  165         m->m_pkthdr.rcvif = ifp;
  166 
  167         ifp->if_opackets++;
  168         ifp->if_obytes += m->m_pkthdr.len;
  169 
  170         m_freem(m);
  171         return (0);
  172 }
  173 
  174 /* ARGSUSED */
  175 static void
  176 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  177 {
  178         RT_LOCK_ASSERT(rt);
  179         rt->rt_rmx.rmx_mtu = DSMTU;
  180 }
  181 
  182 /*
  183  * Process an ioctl request.
  184  */
  185 static int
  186 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  187 {
  188         struct ifaddr *ifa;
  189         struct ifreq *ifr = (struct ifreq *)data;
  190         int error = 0;
  191 
  192         switch (cmd) {
  193 
  194         case SIOCSIFADDR:
  195                 ifp->if_flags |= IFF_UP;
  196                 ifa = (struct ifaddr *)data;
  197                 if (ifa != 0)
  198                         ifa->ifa_rtrequest = discrtrequest;
  199                 /*
  200                  * Everything else is done at a higher level.
  201                  */
  202                 break;
  203 
  204         case SIOCADDMULTI:
  205         case SIOCDELMULTI:
  206                 if (ifr == 0) {
  207                         error = EAFNOSUPPORT;           /* XXX */
  208                         break;
  209                 }
  210                 switch (ifr->ifr_addr.sa_family) {
  211 
  212 #ifdef INET
  213                 case AF_INET:
  214                         break;
  215 #endif
  216 #ifdef INET6
  217                 case AF_INET6:
  218                         break;
  219 #endif
  220 
  221                 default:
  222                         error = EAFNOSUPPORT;
  223                         break;
  224                 }
  225                 break;
  226 
  227         case SIOCSIFMTU:
  228                 ifp->if_mtu = ifr->ifr_mtu;
  229                 break;
  230 
  231         default:
  232                 error = EINVAL;
  233         }
  234         return (error);
  235 }

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