bsd/netns/ns_output.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1984, 1985, 1986, 1987, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  *      @(#)ns_output.c 8.1 (Berkeley) 6/10/93
  55  */
  56
  57 #include <sys/param.h>
  58 #include <sys/malloc.h>
  59 #include <sys/mbuf.h>
  60 #include <sys/errno.h>
  61 #include <sys/socket.h>
  62 #include <sys/socketvar.h>
  63
  64 #include <net/if.h>
  65 #include <net/route.h>
  66
  67 #include <netns/ns.h>
  68 #include <netns/ns_if.h>
  69 #include <netns/idp.h>
  70 #include <netns/idp_var.h>
  71
  72 #ifdef vax
  73 #include <machine/mtpr.h>
  74 #endif
  75 int ns_hold_output = 0;
  76 int ns_copy_output = 0;
  77 int ns_output_cnt = 0;
  78 struct mbuf *ns_lastout;
  79
  80 ns_output(m0, ro, flags)
  81         struct mbuf *m0;
  82         struct route *ro;
  83         int flags;
  84 {
  85         register struct idp *idp = mtod(m0, struct idp *);
  86         register struct ifnet *ifp = 0;
  87         int error = 0;
  88         struct route idproute;
  89         struct sockaddr_ns *dst;
  90         extern int idpcksum;
  91
  92         if (ns_hold_output) {
  93                 if (ns_lastout) {
  94                         (void)m_free(ns_lastout);
  95                 }
  96                 ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
  97         }
  98         /*
  99          * Route packet.
 100          */
 101         if (ro == 0) {
 102                 ro = &idproute;
 103                 bzero((caddr_t)ro, sizeof (*ro));
 104         }
 105         dst = (struct sockaddr_ns *)&ro->ro_dst;
 106         if (ro->ro_rt == 0) {
 107                 dst->sns_family = AF_NS;
 108                 dst->sns_len = sizeof (*dst);
 109                 dst->sns_addr = idp->idp_dna;
 110                 dst->sns_addr.x_port = 0;
 111                 /*
 112                  * If routing to interface only,
 113                  * short circuit routing lookup.
 114                  */
 115                 if (flags & NS_ROUTETOIF) {
 116                         struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
 117
 118                         if (ia == 0) {
 119                                 error = ENETUNREACH;
 120                                 goto bad;
 121                         }
 122                         ifp = ia->ia_ifp;
 123                         goto gotif;
 124                 }
 125                 rtalloc(ro);
 126         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
 127                 /*
 128                  * The old route has gone away; try for a new one.
 129                  */
 130                 rtfree(ro->ro_rt);
 131                 ro->ro_rt = NULL;
 132                 rtalloc(ro);
 133         }
 134         if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
 135                 error = ENETUNREACH;
 136                 goto bad;
 137         }
 138         ro->ro_rt->rt_use++;
 139         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
 140                 dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
 141 gotif:
 142
 143         /*
 144          * Look for multicast addresses and
 145          * and verify user is allowed to send
 146          * such a packet.
 147          */
 148         if (dst->sns_addr.x_host.c_host[0]&1) {
 149                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 150                         error = EADDRNOTAVAIL;
 151                         goto bad;
 152                 }
 153                 if ((flags & NS_ALLOWBROADCAST) == 0) {
 154                         error = EACCES;
 155                         goto bad;
 156                 }
 157         }
 158
 159         if (htons(idp->idp_len) <= ifp->if_mtu) {
 160                 ns_output_cnt++;
 161                 if (ns_copy_output) {
 162                         ns_watch_output(m0, ifp);
 163                 }
 164                 error = (*ifp->if_output)(ifp, m0,
 165                                         (struct sockaddr *)dst, ro->ro_rt);
 166                 goto done;
 167         } else error = EMSGSIZE;
 168
 169
 170 bad:
 171         if (ns_copy_output) {
 172                 ns_watch_output(m0, ifp);
 173         }
 174         m_freem(m0);
 175 done:
 176         if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
 177                 RTFREE(ro->ro_rt);
 178                 ro->ro_rt = 0;
 179         }
 180         return (error);
 181 }