if_disc.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    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/5.2/sys/net/if_disc.c 121816 2003-10-31 18:32:15Z brooks $
   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         if_initname(ifp, ifc->ifc_name, unit);
   97         ifp->if_mtu = DSMTU;
   98         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
   99         ifp->if_ioctl = discioctl;
  100         ifp->if_output = discoutput;
  101         ifp->if_type = IFT_LOOP;
  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_int));
  107         LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
  108 
  109         return (0);
  110 }
  111 
  112 static void
  113 disc_clone_destroy(struct ifnet *ifp)
  114 {
  115         struct disc_softc       *sc;
  116 
  117         sc = ifp->if_softc;
  118 
  119         LIST_REMOVE(sc, sc_list);
  120         bpfdetach(ifp);
  121         if_detach(ifp);
  122 
  123         free(sc, M_DISC);
  124 }
  125 
  126 static int
  127 disc_modevent(module_t mod, int type, void *data) 
  128 { 
  129         switch (type) { 
  130         case MOD_LOAD: 
  131                 LIST_INIT(&disc_softc_list);
  132                 if_clone_attach(&disc_cloner);
  133                 break; 
  134         case MOD_UNLOAD: 
  135                 if_clone_detach(&disc_cloner);
  136 
  137                 while (!LIST_EMPTY(&disc_softc_list))
  138                         disc_clone_destroy(
  139                             &LIST_FIRST(&disc_softc_list)->sc_if);
  140                 break;
  141         } 
  142         return 0; 
  143 } 
  144 
  145 static moduledata_t disc_mod = { 
  146         "if_disc", 
  147         disc_modevent, 
  148         NULL
  149 }; 
  150 
  151 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  152 
  153 static int
  154 discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
  155     struct rtentry *rt)
  156 {
  157         M_ASSERTPKTHDR(m);
  158         /* BPF write needs to be handled specially */
  159         if (dst->sa_family == AF_UNSPEC) {
  160                 dst->sa_family = *(mtod(m, int *));
  161                 m->m_len -= sizeof(int);
  162                 m->m_pkthdr.len -= sizeof(int);
  163                 m->m_data += sizeof(int);
  164         }
  165 
  166         if (ifp->if_bpf) {
  167                 /*
  168                  * We need to prepend the address family as
  169                  * a four byte field.  Cons up a dummy header
  170                  * to pacify bpf.  This is safe because bpf
  171                  * will only read from the mbuf (i.e., it won't
  172                  * try to free it or keep a pointer a to it).
  173                  */
  174                 struct mbuf m0;
  175                 u_int af = dst->sa_family;
  176 
  177                 m0.m_next = m;
  178                 m0.m_len = 4;
  179                 m0.m_data = (char *)&af;
  180 
  181                 BPF_MTAP(ifp, &m0);
  182         }
  183         m->m_pkthdr.rcvif = ifp;
  184 
  185         ifp->if_opackets++;
  186         ifp->if_obytes += m->m_pkthdr.len;
  187 
  188         m_freem(m);
  189         return 0;
  190 }
  191 
  192 /* ARGSUSED */
  193 static void
  194 discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
  195 {
  196         RT_LOCK_ASSERT(rt);
  197 
  198         if (rt)
  199                 rt->rt_rmx.rmx_mtu = DSMTU;
  200 }
  201 
  202 /*
  203  * Process an ioctl request.
  204  */
  205 static int
  206 discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
  207 {
  208         struct ifaddr *ifa;
  209         struct ifreq *ifr = (struct ifreq *)data;
  210         int error = 0;
  211 
  212         switch (cmd) {
  213 
  214         case SIOCSIFADDR:
  215                 ifp->if_flags |= IFF_UP;
  216                 ifa = (struct ifaddr *)data;
  217                 if (ifa != 0)
  218                         ifa->ifa_rtrequest = discrtrequest;
  219                 /*
  220                  * Everything else is done at a higher level.
  221                  */
  222                 break;
  223 
  224         case SIOCADDMULTI:
  225         case SIOCDELMULTI:
  226                 if (ifr == 0) {
  227                         error = EAFNOSUPPORT;           /* XXX */
  228                         break;
  229                 }
  230                 switch (ifr->ifr_addr.sa_family) {
  231 
  232 #ifdef INET
  233                 case AF_INET:
  234                         break;
  235 #endif
  236 #ifdef INET6
  237                 case AF_INET6:
  238                         break;
  239 #endif
  240 
  241                 default:
  242                         error = EAFNOSUPPORT;
  243                         break;
  244                 }
  245                 break;
  246 
  247         case SIOCSIFMTU:
  248                 ifp->if_mtu = ifr->ifr_mtu;
  249                 break;
  250 
  251         default:
  252                 error = EINVAL;
  253         }
  254         return (error);
  255 }

Cache object: 9bcae69fdc21c570dd467c208041ee3f

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

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

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