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/5.4/sys/net/if_disc.c 145335 2005-04-20 19:11:07Z 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_if;     /* 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 
   90         ifp = &sc->sc_if;
   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_ioctl = discioctl;
   97         ifp->if_output = discoutput;
   98         ifp->if_type = IFT_LOOP;
   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_int));
  104         mtx_lock(&disc_mtx);
  105         LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
  106         mtx_unlock(&disc_mtx);
  107 
  108         return (0);
  109 }
  110 
  111 static void
  112 disc_destroy(struct disc_softc *sc)
  113 {
  114 
  115         bpfdetach(&sc->sc_if);
  116         if_detach(&sc->sc_if);
  117 
  118         free(sc, M_DISC);
  119 }
  120 
  121 static void
  122 disc_clone_destroy(struct ifnet *ifp)
  123 {
  124         struct disc_softc       *sc;
  125 
  126         sc = ifp->if_softc;
  127         mtx_lock(&disc_mtx);
  128         LIST_REMOVE(sc, sc_list);
  129         mtx_unlock(&disc_mtx);
  130 
  131         disc_destroy(sc);
  132 }
  133 
  134 static int
  135 disc_modevent(module_t mod, int type, void *data)
  136 {
  137         struct disc_softc *sc;
  138 
  139         switch (type) {
  140         case MOD_LOAD:
  141                 mtx_init(&disc_mtx, "disc_mtx", NULL, MTX_DEF);
  142                 LIST_INIT(&disc_softc_list);
  143                 if_clone_attach(&disc_cloner);
  144                 break;
  145         case MOD_UNLOAD:
  146                 if_clone_detach(&disc_cloner);
  147 
  148                 mtx_lock(&disc_mtx);
  149                 while ((sc = LIST_FIRST(&disc_softc_list)) != NULL) {
  150                         LIST_REMOVE(sc, sc_list);
  151                         mtx_unlock(&disc_mtx);
  152                         disc_destroy(sc);
  153                         mtx_lock(&disc_mtx);
  154                 }
  155                 mtx_unlock(&disc_mtx);
  156                 mtx_destroy(&disc_mtx);
  157                 break;
  158         default:
  159                 return (EOPNOTSUPP);
  160         }
  161         return (0);
  162 }
  163 
  164 static moduledata_t disc_mod = {
  165         "if_disc",
  166         disc_modevent,
  167         NULL
  168 };
  169 
  170 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  171 
  172 static int
  173 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  174     struct rtentry *rt)
  175 {
  176 
  177         M_ASSERTPKTHDR(m);
  178 
  179         /* BPF write needs to be handled specially */
  180         if (dst->sa_family == AF_UNSPEC) {
  181                 dst->sa_family = *(mtod(m, int *));
  182                 m->m_len -= sizeof(int);
  183                 m->m_pkthdr.len -= sizeof(int);
  184                 m->m_data += sizeof(int);
  185         }
  186 
  187         if (ifp->if_bpf) {
  188                 u_int af = dst->sa_family;
  189                 bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
  190         }
  191         m->m_pkthdr.rcvif = ifp;
  192 
  193         ifp->if_opackets++;
  194         ifp->if_obytes += m->m_pkthdr.len;
  195 
  196         m_freem(m);
  197         return (0);
  198 }
  199 
  200 /* ARGSUSED */
  201 static void
  202 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  203 {
  204         RT_LOCK_ASSERT(rt);
  205 
  206         if (rt)
  207                 rt->rt_rmx.rmx_mtu = DSMTU;
  208 }
  209 
  210 /*
  211  * Process an ioctl request.
  212  */
  213 static int
  214 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  215 {
  216         struct ifaddr *ifa;
  217         struct ifreq *ifr = (struct ifreq *)data;
  218         int error = 0;
  219 
  220         switch (cmd) {
  221 
  222         case SIOCSIFADDR:
  223                 ifp->if_flags |= IFF_UP;
  224                 ifa = (struct ifaddr *)data;
  225                 if (ifa != 0)
  226                         ifa->ifa_rtrequest = discrtrequest;
  227                 /*
  228                  * Everything else is done at a higher level.
  229                  */
  230                 break;
  231 
  232         case SIOCADDMULTI:
  233         case SIOCDELMULTI:
  234                 if (ifr == 0) {
  235                         error = EAFNOSUPPORT;           /* XXX */
  236                         break;
  237                 }
  238                 switch (ifr->ifr_addr.sa_family) {
  239 
  240 #ifdef INET
  241                 case AF_INET:
  242                         break;
  243 #endif
  244 #ifdef INET6
  245                 case AF_INET6:
  246                         break;
  247 #endif
  248 
  249                 default:
  250                         error = EAFNOSUPPORT;
  251                         break;
  252                 }
  253                 break;
  254 
  255         case SIOCSIFMTU:
  256                 ifp->if_mtu = ifr->ifr_mtu;
  257                 break;
  258 
  259         default:
  260                 error = EINVAL;
  261         }
  262         return (error);
  263 }

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

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sys/net/if_disc.c