routed.tproj/output.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1988, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgment:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  *
  56  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  57  */
  58
  59
  60 /*
  61  * Routing Table Management Daemon
  62  */
  63 #include "defs.h"
  64
  65 /*
  66  * Apply the function "f" to all non-passive
  67  * interfaces.  If the interface supports the
  68  * use of broadcasting use it, otherwise address
  69  * the output to the known router.
  70  */
  71 void
  72 toall(f, rtstate, skipif)
  73         int (*f)();
  74         int rtstate;
  75         struct interface *skipif;
  76 {
  77         register struct interface *ifp;
  78         register struct sockaddr *dst;
  79         register int flags;
  80         extern struct interface *ifnet;
  81
  82         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
  83                 if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
  84                         continue;
  85                 dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
  86                       ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
  87                       &ifp->int_addr;
  88                 flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
  89                 (*f)(dst, flags, ifp, rtstate);
  90         }
  91 }
  92
  93 /*
  94  * Output a preformed packet.
  95  */
  96 /*ARGSUSED*/
  97 void
  98 sndmsg(dst, flags, ifp, rtstate)
  99         struct sockaddr *dst;
 100         int flags;
 101         struct interface *ifp;
 102         int rtstate;
 103 {
 104
 105         (*afswitch[dst->sa_family].af_output)(s, flags,
 106                 dst, sizeof (struct rip));
 107         TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
 108 }
 109
 110 /*
 111  * Supply dst with the contents of the routing tables.
 112  * If this won't fit in one packet, chop it up into several.
 113  */
 114 void
 115 supply(dst, flags, ifp, rtstate)
 116         struct sockaddr *dst;
 117         int flags;
 118         register struct interface *ifp;
 119         int rtstate;
 120 {
 121         register struct rt_entry *rt;
 122         register struct netinfo *n = msg->rip_nets;
 123         register struct rthash *rh;
 124         struct rthash *base = hosthash;
 125         int doinghost = 1, size;
 126         int (*output)() = afswitch[dst->sa_family].af_output;
 127         int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
 128         int npackets = 0;
 129
 130         msg->rip_cmd = RIPCMD_RESPONSE;
 131         msg->rip_vers = RIPVERSION;
 132         memset(msg->rip_res1, 0, sizeof(msg->rip_res1));
 133 again:
 134         for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
 135         for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
 136                 /*
 137                  * Don't resend the information on the network
 138                  * from which it was received (unless sending
 139                  * in response to a query).
 140                  */
 141                 if (ifp && rt->rt_ifp == ifp &&
 142                     (rt->rt_state & RTS_INTERFACE) == 0)
 143                         continue;
 144                 if (rt->rt_state & RTS_EXTERNAL)
 145                         continue;
 146                 /*
 147                  * For dynamic updates, limit update to routes
 148                  * with the specified state.
 149                  */
 150                 if (rtstate && (rt->rt_state & rtstate) == 0)
 151                         continue;
 152                 /*
 153                  * Limit the spread of subnet information
 154                  * to those who are interested.
 155                  */
 156                 if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
 157                         if (rt->rt_dst.sa_family != dst->sa_family)
 158                                 continue;
 159                         if ((*sendroute)(rt, dst) == 0)
 160                                 continue;
 161                 }
 162                 size = (char *)n - packet;
 163                 if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
 164                         TRACE_OUTPUT(ifp, dst, size);
 165                         (*output)(s, flags, dst, size);
 166                         /*
 167                          * If only sending to ourselves,
 168                          * one packet is enough to monitor interface.
 169                          */
 170                         if (ifp && (ifp->int_flags &
 171                            (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
 172                                 return;
 173                         n = msg->rip_nets;
 174                         npackets++;
 175                 }
 176                 n->rip_dst = rt->rt_dst;
 177                 n->rip_metric = htonl(rt->rt_metric);
 178                 n++;
 179         }
 180         if (doinghost) {
 181                 doinghost = 0;
 182                 base = nethash;
 183                 goto again;
 184         }
 185         if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
 186                 size = (char *)n - packet;
 187                 TRACE_OUTPUT(ifp, dst, size);
 188                 (*output)(s, flags, dst, size);
 189         }
 190 }