The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netns/ns_output.c

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    1 /*      $NetBSD: ns_output.c,v 1.13 2004/04/19 00:10:48 matt Exp $      */
    2 
    3 /*
    4  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ns_output.c 8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: ns_output.c,v 1.13 2004/04/19 00:10:48 matt Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/errno.h>
   42 #include <sys/socket.h>
   43 #include <sys/socketvar.h>
   44 
   45 #include <net/if.h>
   46 #include <net/route.h>
   47 
   48 #include <netns/ns.h>
   49 #include <netns/ns_if.h>
   50 #include <netns/ns_var.h>
   51 #include <netns/idp.h>
   52 #include <netns/idp_var.h>
   53 
   54 #include <machine/stdarg.h>
   55 
   56 int ns_hold_output = 0;
   57 int ns_copy_output = 0;
   58 int ns_output_cnt = 0;
   59 struct mbuf *ns_lastout;
   60 
   61 int
   62 ns_output(struct mbuf *m0, ...)
   63 {
   64         struct route *ro;
   65         int flags;
   66         struct idp *idp = mtod(m0, struct idp *);
   67         struct ifnet *ifp = 0;
   68         int error = 0;
   69         struct route idproute;
   70         struct sockaddr_ns *dst;
   71         va_list ap;
   72 
   73         va_start(ap, m0);
   74         ro = va_arg(ap, struct route *);
   75         flags = va_arg(ap, int);
   76         va_end(ap);
   77 
   78         if (ns_hold_output) {
   79                 if (ns_lastout) {
   80                         (void)m_free(ns_lastout);
   81                 }
   82                 ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
   83         }
   84         /*
   85          * Route packet.
   86          */
   87         if (ro == 0) {
   88                 ro = &idproute;
   89                 bzero((caddr_t)ro, sizeof (*ro));
   90         }
   91         dst = satosns(&ro->ro_dst);
   92         if (ro->ro_rt == 0) {
   93                 dst->sns_family = AF_NS;
   94                 dst->sns_len = sizeof (*dst);
   95                 dst->sns_addr = idp->idp_dna;
   96                 dst->sns_addr.x_port = 0;
   97                 /*
   98                  * If routing to interface only,
   99                  * short circuit routing lookup.
  100                  */
  101                 if (flags & NS_ROUTETOIF) {
  102                         struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
  103 
  104                         if (ia == 0) {
  105                                 error = ENETUNREACH;
  106                                 goto bad;
  107                         }
  108                         ifp = ia->ia_ifp;
  109                         goto gotif;
  110                 }
  111                 rtalloc(ro);
  112         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  113                 /*
  114                  * The old route has gone away; try for a new one.
  115                  */
  116                 rtfree(ro->ro_rt);
  117                 ro->ro_rt = NULL;
  118                 rtalloc(ro);
  119         }
  120         if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
  121                 error = ENETUNREACH;
  122                 goto bad;
  123         }
  124         ro->ro_rt->rt_use++;
  125         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  126                 dst = satosns(ro->ro_rt->rt_gateway);
  127 gotif:
  128 
  129         /*
  130          * Look for multicast addresses and
  131          * and verify user is allowed to send
  132          * such a packet.
  133          */
  134         if (dst->sns_addr.x_host.c_host[0]&1) {
  135                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  136                         error = EADDRNOTAVAIL;
  137                         goto bad;
  138                 }
  139                 if ((flags & NS_ALLOWBROADCAST) == 0) {
  140                         error = EACCES;
  141                         goto bad;
  142                 }
  143         }
  144 
  145         if (ntohs(idp->idp_len) <= ifp->if_mtu) {
  146                 ns_output_cnt++;
  147                 if (ns_copy_output) {
  148                         ns_watch_output(m0, ifp);
  149                 }
  150                 error = (*ifp->if_output)(ifp, m0, snstosa(dst), ro->ro_rt);
  151                 goto done;
  152         } else error = EMSGSIZE;
  153 
  154 
  155 bad:
  156         if (ns_copy_output) {
  157                 ns_watch_output(m0, ifp);
  158         }
  159         m_freem(m0);
  160 done:
  161         if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
  162                 RTFREE(ro->ro_rt);
  163                 ro->ro_rt = 0;
  164         }
  165         return (error);
  166 }

Cache object: 984a32cc97e13d76a2dfbbe57af4368f


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