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 1.12 2003/08/07 16:33:46 agc 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 1.12 2003/08/07 16:33:46 agc 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 #if __STDC__
   63 ns_output(struct mbuf *m0, ...)
   64 #else
   65 ns_output(m0, va_alist)
   66         struct mbuf *m0;
   67         va_dcl
   68 #endif
   69 {
   70         struct route *ro;
   71         int flags;
   72         struct idp *idp = mtod(m0, struct idp *);
   73         struct ifnet *ifp = 0;
   74         int error = 0;
   75         struct route idproute;
   76         struct sockaddr_ns *dst;
   77         va_list ap;
   78 
   79         va_start(ap, m0);
   80         ro = va_arg(ap, struct route *);
   81         flags = va_arg(ap, int);
   82         va_end(ap);
   83 
   84         if (ns_hold_output) {
   85                 if (ns_lastout) {
   86                         (void)m_free(ns_lastout);
   87                 }
   88                 ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
   89         }
   90         /*
   91          * Route packet.
   92          */
   93         if (ro == 0) {
   94                 ro = &idproute;
   95                 bzero((caddr_t)ro, sizeof (*ro));
   96         }
   97         dst = satosns(&ro->ro_dst);
   98         if (ro->ro_rt == 0) {
   99                 dst->sns_family = AF_NS;
  100                 dst->sns_len = sizeof (*dst);
  101                 dst->sns_addr = idp->idp_dna;
  102                 dst->sns_addr.x_port = 0;
  103                 /*
  104                  * If routing to interface only,
  105                  * short circuit routing lookup.
  106                  */
  107                 if (flags & NS_ROUTETOIF) {
  108                         struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
  109 
  110                         if (ia == 0) {
  111                                 error = ENETUNREACH;
  112                                 goto bad;
  113                         }
  114                         ifp = ia->ia_ifp;
  115                         goto gotif;
  116                 }
  117                 rtalloc(ro);
  118         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
  119                 /*
  120                  * The old route has gone away; try for a new one.
  121                  */
  122                 rtfree(ro->ro_rt);
  123                 ro->ro_rt = NULL;
  124                 rtalloc(ro);
  125         }
  126         if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
  127                 error = ENETUNREACH;
  128                 goto bad;
  129         }
  130         ro->ro_rt->rt_use++;
  131         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
  132                 dst = satosns(ro->ro_rt->rt_gateway);
  133 gotif:
  134 
  135         /*
  136          * Look for multicast addresses and
  137          * and verify user is allowed to send
  138          * such a packet.
  139          */
  140         if (dst->sns_addr.x_host.c_host[0]&1) {
  141                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
  142                         error = EADDRNOTAVAIL;
  143                         goto bad;
  144                 }
  145                 if ((flags & NS_ALLOWBROADCAST) == 0) {
  146                         error = EACCES;
  147                         goto bad;
  148                 }
  149         }
  150 
  151         if (ntohs(idp->idp_len) <= ifp->if_mtu) {
  152                 ns_output_cnt++;
  153                 if (ns_copy_output) {
  154                         ns_watch_output(m0, ifp);
  155                 }
  156                 error = (*ifp->if_output)(ifp, m0, snstosa(dst), ro->ro_rt);
  157                 goto done;
  158         } else error = EMSGSIZE;
  159 
  160 
  161 bad:
  162         if (ns_copy_output) {
  163                 ns_watch_output(m0, ifp);
  164         }
  165         m_freem(m0);
  166 done:
  167         if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
  168                 RTFREE(ro->ro_rt);
  169                 ro->ro_rt = 0;
  170         }
  171         return (error);
  172 }

Cache object: abe1cd37f7aa3e9b43a3815fd3bfc984


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