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: src/sys/net/if_disc.c,v 1.14.2.1 1999/09/05 08:17:35 peter Exp $
   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/mbuf.h>
   46 #include <sys/socket.h>
   47 #include <sys/errno.h>
   48 #include <sys/ioctl.h>
   49 #include <sys/time.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_types.h>
   53 #include <net/netisr.h>
   54 #include <net/route.h>
   55 #include <net/bpf.h>
   56 
   57 #ifdef  INET
   58 #include <netinet/in.h>
   59 #include <netinet/in_systm.h>
   60 #include <netinet/in_var.h>
   61 #include <netinet/ip.h>
   62 #endif
   63 
   64 #ifdef NS
   65 #include <netns/ns.h>
   66 #include <netns/ns_if.h>
   67 #endif
   68 
   69 #ifdef ISO
   70 #include <netiso/iso.h>
   71 #include <netiso/iso_var.h>
   72 #endif
   73 
   74 #include "bpfilter.h"
   75 
   76 #ifdef TINY_DSMTU
   77 #define DSMTU   (1024+512)
   78 #else
   79 #define DSMTU   65532
   80 #endif
   81 
   82 static void discattach __P((void *dummy));
   83 PSEUDO_SET(discattach, if_disc);
   84 
   85 static struct   ifnet dsif;
   86 static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
   87                     struct rtentry *);
   88 static void dsrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa);
   89 static int dsioctl(struct ifnet *, int, caddr_t);
   90 
   91 /* ARGSUSED */
   92 static void
   93 discattach(dummy)
   94         void *dummy;
   95 {
   96         register struct ifnet *ifp = &dsif;
   97 
   98         ifp->if_name = "ds";
   99         ifp->if_mtu = DSMTU;
  100         ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
  101         ifp->if_ioctl = dsioctl;
  102         ifp->if_output = dsoutput;
  103         ifp->if_type = IFT_LOOP;
  104         ifp->if_hdrlen = 0;
  105         ifp->if_addrlen = 0;
  106         if_attach(ifp);
  107 #if NBPFILTER > 0
  108         bpfattach(ifp, DLT_NULL, sizeof(u_int));
  109 #endif
  110 }
  111 
  112 static int
  113 dsoutput(ifp, m, dst, rt)
  114         struct ifnet *ifp;
  115         register struct mbuf *m;
  116         struct sockaddr *dst;
  117         register struct rtentry *rt;
  118 {
  119         if ((m->m_flags & M_PKTHDR) == 0)
  120                 panic("dsoutput no HDR");
  121 #if NBPFILTER > 0
  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 (dsif.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(&dsif, &m0);
  146         }
  147 #endif
  148         m->m_pkthdr.rcvif = ifp;
  149 
  150         ifp->if_opackets++;
  151         ifp->if_obytes += m->m_pkthdr.len;
  152 
  153         m_freem(m);
  154         return 0;
  155 }
  156 
  157 /* ARGSUSED */
  158 static void
  159 dsrtrequest(cmd, rt, sa)
  160         int cmd;
  161         struct rtentry *rt;
  162         struct sockaddr *sa;
  163 {
  164         if (rt)
  165                 rt->rt_rmx.rmx_mtu = DSMTU;
  166 }
  167 
  168 /*
  169  * Process an ioctl request.
  170  */
  171 /* ARGSUSED */
  172 static int
  173 dsioctl(ifp, cmd, data)
  174         register struct ifnet *ifp;
  175         int cmd;
  176         caddr_t data;
  177 {
  178         register struct ifaddr *ifa;
  179         register struct ifreq *ifr = (struct ifreq *)data;
  180         register int error = 0;
  181 
  182         switch (cmd) {
  183 
  184         case SIOCSIFADDR:
  185                 ifp->if_flags |= IFF_UP;
  186                 ifa = (struct ifaddr *)data;
  187                 if (ifa != 0)
  188                         ifa->ifa_rtrequest = dsrtrequest;
  189                 /*
  190                  * Everything else is done at a higher level.
  191                  */
  192                 break;
  193 
  194         case SIOCADDMULTI:
  195         case SIOCDELMULTI:
  196                 if (ifr == 0) {
  197                         error = EAFNOSUPPORT;           /* XXX */
  198                         break;
  199                 }
  200                 switch (ifr->ifr_addr.sa_family) {
  201 
  202 #ifdef INET
  203                 case AF_INET:
  204                         break;
  205 #endif
  206 
  207                 default:
  208                         error = EAFNOSUPPORT;
  209                         break;
  210                 }
  211                 break;
  212 
  213         case SIOCSIFMTU:
  214                 ifp->if_mtu = ifr->ifr_mtu;
  215                 break;
  216 
  217         default:
  218                 error = EINVAL;
  219         }
  220         return (error);
  221 }

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

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