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  * $FreeBSD$
   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/module.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/socket.h>
   48 #include <sys/sockio.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_types.h>
   52 #include <net/route.h>
   53 #include <net/bpf.h>
   54 
   55 #include "opt_inet.h"
   56 #include "opt_inet6.h"
   57 
   58 #ifdef TINY_DSMTU
   59 #define DSMTU   (1024+512)
   60 #else
   61 #define DSMTU   65532
   62 #endif
   63 
   64 static void discattach __P((void));
   65 
   66 static struct   ifnet discif;
   67 static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
   68                     struct rtentry *);
   69 static void discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info);
   70 static int discioctl(struct ifnet *, u_long, caddr_t);
   71 
   72 /* ARGSUSED */
   73 static void
   74 discattach()
   75 {
   76         register struct ifnet *ifp = &discif;
   77 
   78         ifp->if_name = "ds";
   79         ifp->if_mtu = DSMTU;
   80         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
   81         ifp->if_ioctl = discioctl;
   82         ifp->if_output = discoutput;
   83         ifp->if_type = IFT_LOOP;
   84         ifp->if_hdrlen = 0;
   85         ifp->if_addrlen = 0;
   86         ifp->if_snd.ifq_maxlen = 20;
   87         if_attach(ifp);
   88         bpfattach(ifp, DLT_NULL, sizeof(u_int));
   89 }
   90 
   91 static int
   92 disc_modevent(module_t mod, int type, void *data) 
   93 { 
   94         switch (type) { 
   95         case MOD_LOAD: 
   96                 discattach();
   97                 break; 
   98         case MOD_UNLOAD: 
   99                 printf("if_disc module unload - not possible for this module type\n"); 
  100                 return EINVAL; 
  101         } 
  102         return 0; 
  103 } 
  104 
  105 static moduledata_t disc_mod = { 
  106         "if_disc", 
  107         disc_modevent, 
  108         NULL
  109 }; 
  110 
  111 DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  112 
  113 static int
  114 discoutput(ifp, m, dst, rt)
  115         struct ifnet *ifp;
  116         register struct mbuf *m;
  117         struct sockaddr *dst;
  118         register struct rtentry *rt;
  119 {
  120         if ((m->m_flags & M_PKTHDR) == 0)
  121                 panic("discoutput no HDR");
  122         /* BPF write needs to be handled specially */
  123         if (dst->sa_family == AF_UNSPEC) {
  124                 dst->sa_family = *(mtod(m, int *));
  125                 m->m_len -= sizeof(int);
  126                 m->m_pkthdr.len -= sizeof(int);
  127                 m->m_data += sizeof(int);
  128         }
  129 
  130         if (discif.if_bpf) {
  131                 /*
  132                  * We need to prepend the address family as
  133                  * a four byte field.  Cons up a dummy header
  134                  * to pacify bpf.  This is safe because bpf
  135                  * will only read from the mbuf (i.e., it won't
  136                  * try to free it or keep a pointer a to it).
  137                  */
  138                 struct mbuf m0;
  139                 u_int af = dst->sa_family;
  140 
  141                 m0.m_next = m;
  142                 m0.m_len = 4;
  143                 m0.m_data = (char *)&af;
  144 
  145                 bpf_mtap(&discif, &m0);
  146         }
  147         m->m_pkthdr.rcvif = ifp;
  148 
  149         ifp->if_opackets++;
  150         ifp->if_obytes += m->m_pkthdr.len;
  151 
  152         m_freem(m);
  153         return 0;
  154 }
  155 
  156 /* ARGSUSED */
  157 static void
  158 discrtrequest(cmd, rt, info)
  159         int cmd;
  160         struct rtentry *rt;
  161         struct rt_addrinfo *info;
  162 {
  163         if (rt)
  164                 rt->rt_rmx.rmx_mtu = DSMTU;
  165 }
  166 
  167 /*
  168  * Process an ioctl request.
  169  */
  170 /* ARGSUSED */
  171 static int
  172 discioctl(ifp, cmd, data)
  173         register struct ifnet *ifp;
  174         u_long cmd;
  175         caddr_t data;
  176 {
  177         register struct ifaddr *ifa;
  178         register struct ifreq *ifr = (struct ifreq *)data;
  179         register int error = 0;
  180 
  181         switch (cmd) {
  182 
  183         case SIOCSIFADDR:
  184                 ifp->if_flags |= IFF_UP;
  185                 ifa = (struct ifaddr *)data;
  186                 if (ifa != 0)
  187                         ifa->ifa_rtrequest = discrtrequest;
  188                 /*
  189                  * Everything else is done at a higher level.
  190                  */
  191                 break;
  192 
  193         case SIOCADDMULTI:
  194         case SIOCDELMULTI:
  195                 if (ifr == 0) {
  196                         error = EAFNOSUPPORT;           /* XXX */
  197                         break;
  198                 }
  199                 switch (ifr->ifr_addr.sa_family) {
  200 
  201 #ifdef INET
  202                 case AF_INET:
  203                         break;
  204 #endif
  205 #ifdef INET6
  206                 case AF_INET6:
  207                         break;
  208 #endif
  209 
  210                 default:
  211                         error = EAFNOSUPPORT;
  212                         break;
  213                 }
  214                 break;
  215 
  216         case SIOCSIFMTU:
  217                 ifp->if_mtu = ifr->ifr_mtu;
  218                 break;
  219 
  220         default:
  221                 error = EINVAL;
  222         }
  223         return (error);
  224 }

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

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