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  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      From: @(#)if_loop.c     8.1 (Berkeley) 6/10/93
   34  * $FreeBSD: releng/5.1/sys/net/if_disc.c 113255 2003-04-08 14:25:47Z des $
   35  */
   36 
   37 /*
   38  * Discard interface driver for protocol testing and timing.
   39  * (Based on the loopback.)
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/kernel.h>
   45 #include <sys/malloc.h>
   46 #include <sys/module.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/sockio.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_types.h>
   53 #include <net/route.h>
   54 #include <net/bpf.h>
   55 
   56 #include "opt_inet.h"
   57 #include "opt_inet6.h"
   58 
   59 #ifdef TINY_DSMTU
   60 #define DSMTU   (1024+512)
   61 #else
   62 #define DSMTU   65532
   63 #endif
   64 
   65 #define DISCNAME        "disc"
   66 
   67 struct disc_softc {
   68         struct ifnet sc_if;     /* must be first */
   69         LIST_ENTRY(disc_softc) sc_list;
   70 };
   71 
   72 static int      discoutput(struct ifnet *, struct mbuf *,
   73                     struct sockaddr *, struct rtentry *);
   74 static void     discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   75 static int      discioctl(struct ifnet *, u_long, caddr_t);
   76 static int      disc_clone_create(struct if_clone *, int);
   77 static void     disc_clone_destroy(struct ifnet *);
   78 
   79 static MALLOC_DEFINE(M_DISC, DISCNAME, "Discard interface");
   80 static LIST_HEAD(, disc_softc) disc_softc_list;
   81 static struct if_clone disc_cloner = IF_CLONE_INITIALIZER(DISCNAME,
   82     disc_clone_create, disc_clone_destroy, 0, IF_MAXUNIT);
   83 
   84 static int
   85 disc_clone_create(struct if_clone *ifc, int unit)
   86 {
   87         struct ifnet            *ifp;
   88         struct disc_softc       *sc;
   89 
   90         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK);
   91         bzero(sc, sizeof(struct disc_softc));
   92 
   93         ifp = &sc->sc_if;
   94 
   95         ifp->if_softc = sc;
   96         ifp->if_name = DISCNAME;
   97         ifp->if_unit = unit;
   98         ifp->if_mtu = DSMTU;
   99         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  100         ifp->if_ioctl = discioctl;
  101         ifp->if_output = discoutput;
  102         ifp->if_type = IFT_LOOP;
  103         ifp->if_hdrlen = 0;
  104         ifp->if_addrlen = 0;
  105         ifp->if_snd.ifq_maxlen = 20;
  106         if_attach(ifp);
  107         bpfattach(ifp, DLT_NULL, sizeof(u_int));
  108         LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
  109 
  110         return (0);
  111 }
  112 
  113 static void
  114 disc_clone_destroy(struct ifnet *ifp)
  115 {
  116         struct disc_softc       *sc;
  117 
  118         sc = ifp->if_softc;
  119 
  120         LIST_REMOVE(sc, sc_list);
  121         bpfdetach(ifp);
  122         if_detach(ifp);
  123 
  124         free(sc, M_DISC);
  125 }
  126 
  127 static int
  128 disc_modevent(module_t mod, int type, void *data) 
  129 { 
  130         switch (type) { 
  131         case MOD_LOAD: 
  132                 LIST_INIT(&disc_softc_list);
  133                 if_clone_attach(&disc_cloner);
  134                 break; 
  135         case MOD_UNLOAD: 
  136                 if_clone_detach(&disc_cloner);
  137 
  138                 while (!LIST_EMPTY(&disc_softc_list))
  139                         disc_clone_destroy(
  140                             &LIST_FIRST(&disc_softc_list)->sc_if);
  141                 break;
  142         } 
  143         return 0; 
  144 } 
  145 
  146 static moduledata_t disc_mod = { 
  147         "if_disc", 
  148         disc_modevent, 
  149         NULL
  150 }; 
  151 
  152 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  153 
  154 static int
  155 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  156     struct rtentry *rt)
  157 {
  158         M_ASSERTPKTHDR(m);
  159         /* BPF write needs to be handled specially */
  160         if (dst->sa_family == AF_UNSPEC) {
  161                 dst->sa_family = *(mtod(m, int *));
  162                 m->m_len -= sizeof(int);
  163                 m->m_pkthdr.len -= sizeof(int);
  164                 m->m_data += sizeof(int);
  165         }
  166 
  167         if (ifp->if_bpf) {
  168                 /*
  169                  * We need to prepend the address family as
  170                  * a four byte field.  Cons up a dummy header
  171                  * to pacify bpf.  This is safe because bpf
  172                  * will only read from the mbuf (i.e., it won't
  173                  * try to free it or keep a pointer a to it).
  174                  */
  175                 struct mbuf m0;
  176                 u_int af = dst->sa_family;
  177 
  178                 m0.m_next = m;
  179                 m0.m_len = 4;
  180                 m0.m_data = (char *)&af;
  181 
  182                 BPF_MTAP(ifp, &m0);
  183         }
  184         m->m_pkthdr.rcvif = ifp;
  185 
  186         ifp->if_opackets++;
  187         ifp->if_obytes += m->m_pkthdr.len;
  188 
  189         m_freem(m);
  190         return 0;
  191 }
  192 
  193 /* ARGSUSED */
  194 static void
  195 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  196 {
  197         if (rt)
  198                 rt->rt_rmx.rmx_mtu = DSMTU;
  199 }
  200 
  201 /*
  202  * Process an ioctl request.
  203  */
  204 static int
  205 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  206 {
  207         struct ifaddr *ifa;
  208         struct ifreq *ifr = (struct ifreq *)data;
  209         int error = 0;
  210 
  211         switch (cmd) {
  212 
  213         case SIOCSIFADDR:
  214                 ifp->if_flags |= IFF_UP;
  215                 ifa = (struct ifaddr *)data;
  216                 if (ifa != 0)
  217                         ifa->ifa_rtrequest = discrtrequest;
  218                 /*
  219                  * Everything else is done at a higher level.
  220                  */
  221                 break;
  222 
  223         case SIOCADDMULTI:
  224         case SIOCDELMULTI:
  225                 if (ifr == 0) {
  226                         error = EAFNOSUPPORT;           /* XXX */
  227                         break;
  228                 }
  229                 switch (ifr->ifr_addr.sa_family) {
  230 
  231 #ifdef INET
  232                 case AF_INET:
  233                         break;
  234 #endif
  235 #ifdef INET6
  236                 case AF_INET6:
  237                         break;
  238 #endif
  239 
  240                 default:
  241                         error = EAFNOSUPPORT;
  242                         break;
  243                 }
  244                 break;
  245 
  246         case SIOCSIFMTU:
  247                 ifp->if_mtu = ifr->ifr_mtu;
  248                 break;
  249 
  250         default:
  251                 error = EINVAL;
  252         }
  253         return (error);
  254 }

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

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sys/net/if_disc.c