routed.tproj/output.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1988, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgment:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  *      @(#)defs.h      8.1 (Berkeley) 6/5/93
  58  */
  59
  60
  61 /*
  62  * Routing Table Management Daemon
  63  */
  64 #include "defs.h"
  65
  66 /*
  67  * Apply the function "f" to all non-passive
  68  * interfaces.  If the interface supports the
  69  * use of broadcasting use it, otherwise address
  70  * the output to the known router.
  71  */
  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 sndmsg(dst, flags, ifp, rtstate)
  98         struct sockaddr *dst;
  99         int flags;
 100         struct interface *ifp;
 101         int rtstate;
 102 {
 103
 104         (*afswitch[dst->sa_family].af_output)(s, flags,
 105                 dst, sizeof (struct rip));
 106         TRACE_OUTPUT(ifp, dst, sizeof (struct rip));
 107 }
 108
 109 /*
 110  * Supply dst with the contents of the routing tables.
 111  * If this won't fit in one packet, chop it up into several.
 112  */
 113 supply(dst, flags, ifp, rtstate)
 114         struct sockaddr *dst;
 115         int flags;
 116         register struct interface *ifp;
 117         int rtstate;
 118 {
 119         register struct rt_entry *rt;
 120         register struct netinfo *n = msg->rip_nets;
 121         register struct rthash *rh;
 122         struct rthash *base = hosthash;
 123         int doinghost = 1, size;
 124         int (*output)() = afswitch[dst->sa_family].af_output;
 125         int (*sendroute)() = afswitch[dst->sa_family].af_sendroute;
 126         int npackets = 0;
 127
 128         msg->rip_cmd = RIPCMD_RESPONSE;
 129         msg->rip_vers = RIPVERSION;
 130         memset(msg->rip_res1, 0, sizeof(msg->rip_res1));
 131 again:
 132         for (rh = base; rh < &base[ROUTEHASHSIZ]; rh++)
 133         for (rt = rh->rt_forw; rt != (struct rt_entry *)rh; rt = rt->rt_forw) {
 134                 /*
 135                  * Don't resend the information on the network
 136                  * from which it was received (unless sending
 137                  * in response to a query).
 138                  */
 139                 if (ifp && rt->rt_ifp == ifp &&
 140                     (rt->rt_state & RTS_INTERFACE) == 0)
 141                         continue;
 142                 if (rt->rt_state & RTS_EXTERNAL)
 143                         continue;
 144                 /*
 145                  * For dynamic updates, limit update to routes
 146                  * with the specified state.
 147                  */
 148                 if (rtstate && (rt->rt_state & rtstate) == 0)
 149                         continue;
 150                 /*
 151                  * Limit the spread of subnet information
 152                  * to those who are interested.
 153                  */
 154                 if (doinghost == 0 && rt->rt_state & RTS_SUBNET) {
 155                         if (rt->rt_dst.sa_family != dst->sa_family)
 156                                 continue;
 157                         if ((*sendroute)(rt, dst) == 0)
 158                                 continue;
 159                 }
 160                 size = (char *)n - packet;
 161                 if (size > MAXPACKETSIZE - sizeof (struct netinfo)) {
 162                         TRACE_OUTPUT(ifp, dst, size);
 163                         (*output)(s, flags, dst, size);
 164                         /*
 165                          * If only sending to ourselves,
 166                          * one packet is enough to monitor interface.
 167                          */
 168                         if (ifp && (ifp->int_flags &
 169                            (IFF_BROADCAST | IFF_POINTOPOINT | IFF_REMOTE)) == 0)
 170                                 return;
 171                         n = msg->rip_nets;
 172                         npackets++;
 173                 }
 174                 n->rip_dst = rt->rt_dst;
 175 #if BSD < 198810
 176                 if (sizeof(n->rip_dst.sa_family) > 1)   /* XXX */
 177                 n->rip_dst.sa_family = htons(n->rip_dst.sa_family);
 178 #else
 179 #define osa(x) ((struct osockaddr *)(&(x)))
 180                 osa(n->rip_dst)->sa_family = htons(n->rip_dst.sa_family);
 181 #endif
 182                 n->rip_metric = htonl(rt->rt_metric);
 183                 n++;
 184         }
 185         if (doinghost) {
 186                 doinghost = 0;
 187                 base = nethash;
 188                 goto again;
 189         }
 190         if (n != msg->rip_nets || (npackets == 0 && rtstate == 0)) {
 191                 size = (char *)n - packet;
 192                 TRACE_OUTPUT(ifp, dst, size);
 193                 (*output)(s, flags, dst, size);
 194         }
 195 }