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