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/6.3/sys/net/if_disc.c 173886 2007-11-24 19:45:58Z cvs2svn $
   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;   /* must be first */
   66         LIST_ENTRY(disc_softc) sc_list;
   67 };
   68 
   69 static int      discoutput(struct ifnet *, struct mbuf *,
   70                     struct sockaddr *, struct rtentry *);
   71 static void     discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
   72 static int      discioctl(struct ifnet *, u_long, caddr_t);
   73 static int      disc_clone_create(struct if_clone *, int);
   74 static void     disc_clone_destroy(struct ifnet *);
   75 
   76 static struct mtx disc_mtx;
   77 static MALLOC_DEFINE(M_DISC, DISCNAME, "Discard interface");
   78 static LIST_HEAD(, disc_softc) disc_softc_list;
   79 
   80 IFC_SIMPLE_DECLARE(disc, 0);
   81 
   82 static int
   83 disc_clone_create(struct if_clone *ifc, int unit)
   84 {
   85         struct ifnet            *ifp;
   86         struct disc_softc       *sc;
   87 
   88         sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
   89         ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
   90         if (ifp == NULL) {
   91                 free(sc, M_DISC);
   92                 return (ENOSPC);
   93         }
   94 
   95         ifp->if_softc = sc;
   96         if_initname(ifp, ifc->ifc_name, unit);
   97         ifp->if_mtu = DSMTU;
   98         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
   99         ifp->if_drv_flags = IFF_DRV_RUNNING;
  100         ifp->if_ioctl = discioctl;
  101         ifp->if_output = discoutput;
  102         ifp->if_hdrlen = 0;
  103         ifp->if_addrlen = 0;
  104         ifp->if_snd.ifq_maxlen = 20;
  105         if_attach(ifp);
  106         bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
  107         mtx_lock(&disc_mtx);
  108         LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
  109         mtx_unlock(&disc_mtx);
  110 
  111         return (0);
  112 }
  113 
  114 static void
  115 disc_destroy(struct disc_softc *sc)
  116 {
  117 
  118         bpfdetach(sc->sc_ifp);
  119         if_detach(sc->sc_ifp);
  120         if_free(sc->sc_ifp);
  121 
  122         free(sc, M_DISC);
  123 }
  124 
  125 static void
  126 disc_clone_destroy(struct ifnet *ifp)
  127 {
  128         struct disc_softc       *sc;
  129 
  130         sc = ifp->if_softc;
  131         mtx_lock(&disc_mtx);
  132         LIST_REMOVE(sc, sc_list);
  133         mtx_unlock(&disc_mtx);
  134 
  135         disc_destroy(sc);
  136 }
  137 
  138 static int
  139 disc_modevent(module_t mod, int type, void *data)
  140 {
  141         struct disc_softc *sc;
  142 
  143         switch (type) {
  144         case MOD_LOAD:
  145                 mtx_init(&disc_mtx, "disc_mtx", NULL, MTX_DEF);
  146                 LIST_INIT(&disc_softc_list);
  147                 if_clone_attach(&disc_cloner);
  148                 break;
  149         case MOD_UNLOAD:
  150                 if_clone_detach(&disc_cloner);
  151 
  152                 mtx_lock(&disc_mtx);
  153                 while ((sc = LIST_FIRST(&disc_softc_list)) != NULL) {
  154                         LIST_REMOVE(sc, sc_list);
  155                         mtx_unlock(&disc_mtx);
  156                         disc_destroy(sc);
  157                         mtx_lock(&disc_mtx);
  158                 }
  159                 mtx_unlock(&disc_mtx);
  160                 mtx_destroy(&disc_mtx);
  161                 break;
  162         default:
  163                 return (EOPNOTSUPP);
  164         }
  165         return (0);
  166 }
  167 
  168 static moduledata_t disc_mod = {
  169         "if_disc",
  170         disc_modevent,
  171         NULL
  172 };
  173 
  174 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  175 
  176 static int
  177 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  178     struct rtentry *rt)
  179 {
  180         u_int32_t af;
  181 
  182         M_ASSERTPKTHDR(m);
  183 
  184         /* BPF writes need to be handled specially. */
  185         if (dst->sa_family == AF_UNSPEC) {
  186                 bcopy(dst->sa_data, &af, sizeof(af));
  187                 dst->sa_family = af;
  188         }
  189 
  190         if (bpf_peers_present(ifp->if_bpf)) {
  191                 u_int af = dst->sa_family;
  192                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  193         }
  194         m->m_pkthdr.rcvif = ifp;
  195 
  196         ifp->if_opackets++;
  197         ifp->if_obytes += m->m_pkthdr.len;
  198 
  199         m_freem(m);
  200         return (0);
  201 }
  202 
  203 /* ARGSUSED */
  204 static void
  205 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  206 {
  207         RT_LOCK_ASSERT(rt);
  208         rt->rt_rmx.rmx_mtu = DSMTU;
  209 }
  210 
  211 /*
  212  * Process an ioctl request.
  213  */
  214 static int
  215 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  216 {
  217         struct ifaddr *ifa;
  218         struct ifreq *ifr = (struct ifreq *)data;
  219         int error = 0;
  220 
  221         switch (cmd) {
  222 
  223         case SIOCSIFADDR:
  224                 ifp->if_flags |= IFF_UP;
  225                 ifa = (struct ifaddr *)data;
  226                 if (ifa != 0)
  227                         ifa->ifa_rtrequest = discrtrequest;
  228                 /*
  229                  * Everything else is done at a higher level.
  230                  */
  231                 break;
  232 
  233         case SIOCADDMULTI:
  234         case SIOCDELMULTI:
  235                 if (ifr == 0) {
  236                         error = EAFNOSUPPORT;           /* XXX */
  237                         break;
  238                 }
  239                 switch (ifr->ifr_addr.sa_family) {
  240 
  241 #ifdef INET
  242                 case AF_INET:
  243                         break;
  244 #endif
  245 #ifdef INET6
  246                 case AF_INET6:
  247                         break;
  248 #endif
  249 
  250                 default:
  251                         error = EAFNOSUPPORT;
  252                         break;
  253                 }
  254                 break;
  255 
  256         case SIOCSIFMTU:
  257                 ifp->if_mtu = ifr->ifr_mtu;
  258                 break;
  259 
  260         default:
  261                 error = EINVAL;
  262         }
  263         return (error);
  264 }

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

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sys/net/if_disc.c