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 toall(f, rtstate, skipif)
  72         int (*f)();
  73         int rtstate;
  74         struct interface *skipif;
  75 {
  76         register struct interface *ifp;
  77         register struct sockaddr *dst;
  78         register int flags;
  79         extern struct interface *ifnet;
  80
  81         for (ifp = ifnet; ifp; ifp = ifp->int_next) {
  82                 if (ifp->int_flags & IFF_PASSIVE || ifp == skipif)
  83                         continue;
  84                 dst = ifp->int_flags & IFF_BROADCAST ? &ifp->int_broadaddr :
  85                       ifp->int_flags & IFF_POINTOPOINT ? &ifp->int_dstaddr :
  86                       &ifp->int_addr;
  87                 flags = ifp->int_flags & IFF_INTERFACE ? MSG_DONTROUTE : 0;
  88                 (*f)(dst, flags, ifp, rtstate);
  89         }
  90 }
  91
  92 /*
  93  * Output a preformed packet.
  94  */
  95 /*ARGSUSED*/
  96 sndmsg(dst, flags, ifp, rtstate)
  97         struct sockaddr *dst;
  98         int flags;
  99         struct interface *ifp;
 100         int rtstate;
 101 {
 102
 103         (*afswitch[dst->sa_family].af_output)(s, flags,
 104                 dst, sizeof (struct rip));
 105         TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
 106 }
 107
 108 /*
 109  * Supply dst with the contents of the routing tables.
 110  * If this won't fit in one packet, chop it up into several.
 111  */
 112 supply(dst, flags, ifp, rtstate)
 113         struct sockaddr *dst;
 114         int flags;
 115         register struct interface *ifp;
 116         int rtstate;
 117 {
 118         register struct rt_entry *rt;
 119         register struct netinfo *n = msg->rip_nets;
 120         register struct rthash *rh;
 121         struct rthash *base = hosthash;
 122         int doinghost = 1, size;
 123         int (*output)() = afswitch[dst->sa_family].af_output;
 124         int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
 125         int npackets = 0;
 126
 127         msg->rip_cmd = RIPCMD_RESPONSE;
 128         msg->rip_vers = RIPVERSION;
 129         memset(msg->rip_res1, 0, sizeof(msg->rip_res1));
 130 again:
 131         for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
 132         for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
 133                 /*
 134                  * Don't resend the information on the network
 135                  * from which it was received (unless sending
 136                  * in response to a query).
 137                  */
 138                 if (ifp && rt->rt_ifp == ifp &&
 139                     (rt->rt_state & RTS_INTERFACE) == 0)
 140                         continue;
 141                 if (rt->rt_state & RTS_EXTERNAL)
 142                         continue;
 143                 /*
 144                  * For dynamic updates, limit update to routes
 145                  * with the specified state.
 146                  */
 147                 if (rtstate && (rt->rt_state & rtstate) == 0)
 148                         continue;
 149                 /*
 150                  * Limit the spread of subnet information
 151                  * to those who are interested.
 152                  */
 153                 if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
 154                         if (rt->rt_dst.sa_family != dst->sa_family)
 155                                 continue;
 156                         if ((*sendroute)(rt, dst) == 0)
 157                                 continue;
 158                 }
 159                 size = (char *)n - packet;
 160                 if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
 161                         TRACE_OUTPUT(ifp, dst, size);
 162                         (*output)(s, flags, dst, size);
 163                         /*
 164                          * If only sending to ourselves,
 165                          * one packet is enough to monitor interface.
 166                          */
 167                         if (ifp && (ifp->int_flags &
 168                            (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
 169                                 return;
 170                         n = msg->rip_nets;
 171                         npackets++;
 172                 }
 173                 n->rip_dst = rt->rt_dst;
 174 #if BSD < 198810
 175                 if (sizeof(n->rip_dst.sa_family) > 1)   /* XXX */
 176                 n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
 177 #else
 178 #define osa(x) ((struct osockaddr *)(&(x)))
 179                 osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family);
 180 #endif
 181                 n->rip_metric = htonl(rt->rt_metric);
 182                 n++;
 183         }
 184         if (doinghost) {
 185                 doinghost = 0;
 186                 base = nethash;
 187                 goto again;
 188         }
 189         if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
 190                 size = (char *)n - packet;
 191                 TRACE_OUTPUT(ifp, dst, size);
 192                 (*output)(s, flags, dst, size);
 193         }
 194 }