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/10.0/sys/net/if_disc.c 249925 2013-04-26 12:50:32Z glebius $
   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 struct disc_softc {
   63         struct ifnet *sc_ifp;
   64 };
   65 
   66 static int      discoutput(struct ifnet *, struct mbuf *,
   67                     const struct sockaddr *, struct route *);
   68 static void     discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   69 static int      discioctl(struct ifnet *, u_long, caddr_t);
   70 static int      disc_clone_create(struct if_clone *, int, caddr_t);
   71 static void     disc_clone_destroy(struct ifnet *);
   72 
   73 static const char discname[] = "disc";
   74 static MALLOC_DEFINE(M_DISC, discname, "Discard interface");
   75 
   76 static struct if_clone *disc_cloner;
   77 
   78 static int
   79 disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
   80 {
   81         struct ifnet            *ifp;
   82         struct disc_softc       *sc;
   83 
   84         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   85         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   86         if (ifp == NULL) {
   87                 free(sc, M_DISC);
   88                 return (ENOSPC);
   89         }
   90 
   91         ifp->if_softc = sc;
   92         if_initname(ifp, discname, unit);
   93         ifp->if_mtu = DSMTU;
   94         /*
   95          * IFF_LOOPBACK should not be removed from disc's flags because
   96          * it controls what PF-specific routes are magically added when
   97          * a network address is assigned to the interface.  Things just
   98          * won't work as intended w/o such routes because the output
   99          * interface selection for a packet is totally route-driven.
  100          * A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
  101          * IFF_POINTOPOINT, but it would result in different properties
  102          * of the interface.
  103          */
  104         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  105         ifp->if_drv_flags = IFF_DRV_RUNNING;
  106         ifp->if_ioctl = discioctl;
  107         ifp->if_output = discoutput;
  108         ifp->if_hdrlen = 0;
  109         ifp->if_addrlen = 0;
  110         ifp->if_snd.ifq_maxlen = 20;
  111         if_attach(ifp);
  112         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  113 
  114         return (0);
  115 }
  116 
  117 static void
  118 disc_clone_destroy(struct ifnet *ifp)
  119 {
  120         struct disc_softc       *sc;
  121 
  122         sc = ifp->if_softc;
  123 
  124         bpfdetach(ifp);
  125         if_detach(ifp);
  126         if_free(ifp);
  127 
  128         free(sc, M_DISC);
  129 }
  130 
  131 static int
  132 disc_modevent(module_t mod, int type, void *data)
  133 {
  134 
  135         switch (type) {
  136         case MOD_LOAD:
  137                 disc_cloner = if_clone_simple(discname, disc_clone_create,
  138                     disc_clone_destroy, 0);
  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, const 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         else
  169                 af = dst->sa_family;
  170 
  171         if (bpf_peers_present(ifp->if_bpf))
  172                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  173 
  174         m->m_pkthdr.rcvif = ifp;
  175 
  176         ifp->if_opackets++;
  177         ifp->if_obytes += m->m_pkthdr.len;
  178 
  179         m_freem(m);
  180         return (0);
  181 }
  182 
  183 /* ARGSUSED */
  184 static void
  185 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  186 {
  187         RT_LOCK_ASSERT(rt);
  188         rt->rt_rmx.rmx_mtu = DSMTU;
  189 }
  190 
  191 /*
  192  * Process an ioctl request.
  193  */
  194 static int
  195 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  196 {
  197         struct ifaddr *ifa;
  198         struct ifreq *ifr = (struct ifreq *)data;
  199         int error = 0;
  200 
  201         switch (cmd) {
  202 
  203         case SIOCSIFADDR:
  204                 ifp->if_flags |= IFF_UP;
  205                 ifa = (struct ifaddr *)data;
  206                 if (ifa != 0)
  207                         ifa->ifa_rtrequest = discrtrequest;
  208                 /*
  209                  * Everything else is done at a higher level.
  210                  */
  211                 break;
  212 
  213         case SIOCADDMULTI:
  214         case SIOCDELMULTI:
  215                 if (ifr == 0) {
  216                         error = EAFNOSUPPORT;           /* XXX */
  217                         break;
  218                 }
  219                 switch (ifr->ifr_addr.sa_family) {
  220 
  221 #ifdef INET
  222                 case AF_INET:
  223                         break;
  224 #endif
  225 #ifdef INET6
  226                 case AF_INET6:
  227                         break;
  228 #endif
  229 
  230                 default:
  231                         error = EAFNOSUPPORT;
  232                         break;
  233                 }
  234                 break;
  235 
  236         case SIOCSIFMTU:
  237                 ifp->if_mtu = ifr->ifr_mtu;
  238                 break;
  239 
  240         default:
  241                 error = EINVAL;
  242         }
  243         return (error);
  244 }

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

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sys/net/if_disc.c