usr.sbin/IPXrouted/startup.c

   1 /*
   2  * Copyright (c) 1985, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 1995 John Hay.  All rights reserved.
   6  *
   7  * This file includes significant work done at Cornell University by
   8  * Bill Nesheim.  That work included by permission.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * $FreeBSD: src/usr.sbin/IPXrouted/startup.c,v 1.8.2.1 2000/07/01 10:46:25 ps Exp $
  39  * $DragonFly: src/usr.sbin/IPXrouted/startup.c,v 1.4 2004/12/18 22:48:02 swildner Exp $
  40  *
  41  * @(#)startup.c        8.1 (Berkeley) 6/5/93
  42  */
  43
  44 /*
  45  * Routing Table Management Daemon
  46  */
  47 #include "defs.h"
  48
  49 #include <sys/param.h>
  50 #include <sys/ioctl.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/time.h>
  53
  54 #include <net/if.h>
  55 #include <net/if_dl.h>
  56
  57 #include <errno.h>
  58 #include <nlist.h>
  59 #include <search.h>
  60 #include <stdlib.h>
  61
  62 struct  interface *ifnet;
  63 int     lookforinterfaces = 1;
  64 int     performnlist = 1;
  65 int     gateway = 0;
  66 int     externalinterfaces = 0;         /* # of remote and local interfaces */
  67
  68 void
  69 quit(char *s)
  70 {
  71         int sverrno = errno;
  72
  73         fprintf(stderr, "IPXroute: ");
  74         if (s)
  75                 fprintf(stderr, "%s: ", s);
  76         fprintf(stderr, "%s\n", strerror(sverrno));
  77         exit(1);
  78         /* NOTREACHED */
  79 }
  80
  81 struct rt_addrinfo info;
  82 /* Sleazy use of local variables throughout file, warning!!!! */
  83 #define netmask info.rti_info[RTAX_NETMASK]
  84 #define ifaaddr info.rti_info[RTAX_IFA]
  85 #define brdaddr info.rti_info[RTAX_BRD]
  86
  87 #define ROUNDUP(a) \
  88         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  89 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  90
  91 void
  92 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
  93 {
  94         struct sockaddr *sa;
  95         int i;
  96
  97         bzero(rtinfo->rti_info, sizeof(rtinfo->rti_info));
  98         for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
  99                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 100                         continue;
 101                 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
 102                 ADVANCE(cp, sa);
 103         }
 104 }
 105
 106 /*
 107  * Find the network interfaces which have configured themselves.
 108  * If the interface is present but not yet up (for example an
 109  * ARPANET IMP), set the lookforinterfaces flag so we'll
 110  * come back later and look again.
 111  */
 112 void
 113 ifinit(void)
 114 {
 115         struct interface ifs, *ifp;
 116         size_t needed;
 117         int mib[6], no_ipxaddr = 0, flags = 0;
 118         char *buf, *cplim, *cp;
 119         struct if_msghdr *ifm;
 120         struct ifa_msghdr *ifam;
 121         struct sockaddr_dl *sdl = 0;
 122
 123         mib[0] = CTL_NET;
 124         mib[1] = PF_ROUTE;
 125         mib[2] = 0;
 126         mib[3] = AF_IPX;
 127         mib[4] = NET_RT_IFLIST;
 128         mib[5] = 0;
 129         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
 130                 quit("route-sysctl-estimate");
 131         if ((buf = malloc(needed)) == NULL)
 132                 quit("malloc");
 133         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
 134         lookforinterfaces = 0;
 135         cplim = buf + needed;
 136         for (cp = buf; cp < cplim; cp += ifm->ifm_msglen) {
 137                 ifm = (struct if_msghdr *)cp;
 138                 if (ifm->ifm_type == RTM_IFINFO) {
 139                         bzero(&ifs, sizeof(ifs));
 140                         ifs.int_flags = flags = ifm->ifm_flags | IFF_INTERFACE;
 141                         if ((flags & IFF_UP) == 0 || no_ipxaddr)
 142                                 lookforinterfaces = 1;
 143                         sdl = (struct sockaddr_dl *) (ifm + 1);
 144                         sdl->sdl_data[sdl->sdl_nlen] = 0;
 145                         no_ipxaddr = 1;
 146                         continue;
 147                 }
 148                 if (ifm->ifm_type != RTM_NEWADDR)
 149                         quit("ifinit: out of sync");
 150                 if ((flags & IFF_UP) == 0)
 151                         continue;
 152                 ifam = (struct ifa_msghdr *)ifm;
 153                 info.rti_addrs = ifam->ifam_addrs;
 154                 rt_xaddrs((char *)(ifam + 1), cp + ifam->ifam_msglen, &info);
 155                 if (ifaaddr == 0) {
 156                         syslog(LOG_ERR, "%s: (get addr)", sdl->sdl_data);
 157                         continue;
 158                 }
 159                 ifs.int_addr = *ifaaddr;
 160                 if (ifs.int_addr.sa_family != AF_IPX)
 161                         continue;
 162                 no_ipxaddr = 0;
 163                 if (ifs.int_flags & IFF_POINTOPOINT) {
 164                         if (brdaddr == 0) {
 165                                 syslog(LOG_ERR, "%s: (get dstaddr)",
 166                                         sdl->sdl_data);
 167                                 continue;
 168                         }
 169                         if (brdaddr->sa_family == AF_UNSPEC) {
 170                                 lookforinterfaces = 1;
 171                                 continue;
 172                         }
 173                         ifs.int_dstaddr = *brdaddr;
 174                 }
 175                 if (ifs.int_flags & IFF_BROADCAST) {
 176                         if (brdaddr == 0) {
 177                                 syslog(LOG_ERR, "%s: (get broadaddr)",
 178                                         sdl->sdl_data);
 179                                 continue;
 180                         }
 181                         ifs.int_dstaddr = *brdaddr;
 182                 }
 183                 if (ifs.int_flags & IFF_LOOPBACK) {
 184                         ifs.int_dstaddr = ifs.int_addr;
 185                 }
 186                 /*
 187                  * already known to us?
 188                  * what makes a POINTOPOINT if unique is its dst addr,
 189                  * NOT its source address
 190                  */
 191                 if ( ((ifs.int_flags & IFF_POINTOPOINT) &&
 192                         if_ifwithdstaddr(&ifs.int_dstaddr)) ||
 193                         ( ((ifs.int_flags & IFF_POINTOPOINT) == 0) &&
 194                         if_ifwithaddr(&ifs.int_addr)))
 195                         continue;
 196                 ifp = (struct interface *)
 197                         malloc(sdl->sdl_nlen + 1 + sizeof(ifs));
 198                 if (ifp == 0) {
 199                         syslog(LOG_ERR, "IPXrouted: out of memory\n");
 200                         lookforinterfaces = 1;
 201                         break;
 202                 }
 203                 *ifp = ifs;
 204                 /*
 205                  * Count the # of directly connected networks
 206                  * and point to point links which aren't looped
 207                  * back to ourself.  This is used below to
 208                  * decide if we should be a routing ``supplier''.
 209                  */
 210                 if ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
 211                     if_ifwithaddr(&ifs.int_dstaddr) == 0)
 212                         externalinterfaces++;
 213                 /*
 214                  * If we have a point-to-point link, we want to act
 215                  * as a supplier even if it's our only interface,
 216                  * as that's the only way our peer on the other end
 217                  * can tell that the link is up.
 218                  */
 219                 if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
 220                         supplier = 1;
 221                 ifp->int_name = (char *)(ifp + 1);
 222                 strcpy(ifp->int_name, sdl->sdl_data);
 223
 224                 ifp->int_metric = ifam->ifam_metric;
 225                 ifp->int_next = ifnet;
 226                 ifnet = ifp;
 227                 traceinit(ifp);
 228                 addrouteforif(ifp);
 229         }
 230         if (externalinterfaces > 1 && supplier < 0)
 231                 supplier = 1;
 232         free(buf);
 233 }
 234
 235 void
 236 addrouteforif(struct interface *ifp)
 237 {
 238         struct sockaddr_ipx net;
 239         struct sockaddr *dst;
 240         struct rt_entry *rt;
 241
 242         if (ifp->int_flags & IFF_POINTOPOINT) {
 243                 int (*match)();
 244                 struct interface *ifp2 = ifnet;
 245
 246                 dst = &ifp->int_dstaddr;
 247
 248                 /* Search for interfaces with the same net */
 249                 ifp->int_sq.n = ifp->int_sq.p = &(ifp->int_sq);
 250                 match = afswitch[dst->sa_family].af_netmatch;
 251                 if (match)
 252                 for (ifp2 = ifnet; ifp2; ifp2 =ifp2->int_next) {
 253                         if ((ifp->int_flags & IFF_POINTOPOINT) == 0)
 254                                 continue;
 255                         if ((*match)(&ifp2->int_dstaddr,&ifp->int_dstaddr)) {
 256                                 insque(&ifp2->int_sq,&ifp->int_sq);
 257                                 break;
 258                         }
 259                 }
 260         } else {
 261                 bzero(&net, sizeof(net));
 262                 net.sipx_family = AF_IPX;
 263                 net.sipx_len = sizeof (net);
 264                 net.sipx_addr.x_net = satoipx_addr(ifp->int_broadaddr).x_net;
 265                 dst = (struct sockaddr *)&net;
 266         }
 267         rt = rtlookup(dst);
 268         if (rt)
 269                 rtdelete(rt);
 270         if (tracing)
 271                 fprintf(stderr, "Adding route to interface %s\n", ifp->int_name);
 272         if (ifp->int_transitions++ > 0)
 273                 syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
 274         rtadd(dst, &ifp->int_addr, ifp->int_metric, 0,
 275                 ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE));
 276 }
 277