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 <stdlib.h>
  60
  61 struct  interface *ifnet;
  62 int     lookforinterfaces = 1;
  63 int     performnlist = 1;
  64 int     gateway = 0;
  65 int     externalinterfaces = 0;         /* # of remote and local interfaces */
  66
  67 void
  68 quit(char *s)
  69 {
  70         int sverrno = errno;
  71
  72         fprintf(stderr, "IPXroute: ");
  73         if (s)
  74                 fprintf(stderr, "%s: ", s);
  75         fprintf(stderr, "%s\n", strerror(sverrno));
  76         exit(1);
  77         /* NOTREACHED */
  78 }
  79
  80 struct rt_addrinfo info;
  81 /* Sleazy use of local variables throughout file, warning!!!! */
  82 #define netmask info.rti_info[RTAX_NETMASK]
  83 #define ifaaddr info.rti_info[RTAX_IFA]
  84 #define brdaddr info.rti_info[RTAX_BRD]
  85
  86 #define ROUNDUP(a) \
  87         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  88 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  89
  90 void
  91 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
  92 {
  93         struct sockaddr *sa;
  94         int i;
  95
  96         bzero(rtinfo->rti_info, sizeof(rtinfo->rti_info));
  97         for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
  98                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
  99                         continue;
 100                 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
 101                 ADVANCE(cp, sa);
 102         }
 103 }
 104
 105 /*
 106  * Find the network interfaces which have configured themselves.
 107  * If the interface is present but not yet up (for example an
 108  * ARPANET IMP), set the lookforinterfaces flag so we'll
 109  * come back later and look again.
 110  */
 111 void
 112 ifinit(void)
 113 {
 114         struct interface ifs, *ifp;
 115         size_t needed;
 116         int mib[6], no_ipxaddr = 0, flags = 0;
 117         char *buf, *cplim, *cp;
 118         struct if_msghdr *ifm;
 119         struct ifa_msghdr *ifam;
 120         struct sockaddr_dl *sdl = 0;
 121
 122         mib[0] = CTL_NET;
 123         mib[1] = PF_ROUTE;
 124         mib[2] = 0;
 125         mib[3] = AF_IPX;
 126         mib[4] = NET_RT_IFLIST;
 127         mib[5] = 0;
 128         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
 129                 quit("route-sysctl-estimate");
 130         if ((buf = malloc(needed)) == NULL)
 131                 quit("malloc");
 132         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
 133         lookforinterfaces = 0;
 134         cplim = buf + needed;
 135         for (cp = buf; cp < cplim; cp += ifm->ifm_msglen) {
 136                 ifm = (struct if_msghdr *)cp;
 137                 if (ifm->ifm_type == RTM_IFINFO) {
 138                         bzero(&ifs, sizeof(ifs));
 139                         ifs.int_flags = flags = ifm->ifm_flags | IFF_INTERFACE;
 140                         if ((flags & IFF_UP) == 0 || no_ipxaddr)
 141                                 lookforinterfaces = 1;
 142                         sdl = (struct sockaddr_dl *) (ifm + 1);
 143                         sdl->sdl_data[sdl->sdl_nlen] = 0;
 144                         no_ipxaddr = 1;
 145                         continue;
 146                 }
 147                 if (ifm->ifm_type != RTM_NEWADDR)
 148                         quit("ifinit: out of sync");
 149                 if ((flags & IFF_UP) == 0)
 150                         continue;
 151                 ifam = (struct ifa_msghdr *)ifm;
 152                 info.rti_addrs = ifam->ifam_addrs;
 153                 rt_xaddrs((char *)(ifam + 1), cp + ifam->ifam_msglen, &info);
 154                 if (ifaaddr == 0) {
 155                         syslog(LOG_ERR, "%s: (get addr)", sdl->sdl_data);
 156                         continue;
 157                 }
 158                 ifs.int_addr = *ifaaddr;
 159                 if (ifs.int_addr.sa_family != AF_IPX)
 160                         continue;
 161                 no_ipxaddr = 0;
 162                 if (ifs.int_flags & IFF_POINTOPOINT) {
 163                         if (brdaddr == 0) {
 164                                 syslog(LOG_ERR, "%s: (get dstaddr)",
 165                                         sdl->sdl_data);
 166                                 continue;
 167                         }
 168                         if (brdaddr->sa_family == AF_UNSPEC) {
 169                                 lookforinterfaces = 1;
 170                                 continue;
 171                         }
 172                         ifs.int_dstaddr = *brdaddr;
 173                 }
 174                 if (ifs.int_flags & IFF_BROADCAST) {
 175                         if (brdaddr == 0) {
 176                                 syslog(LOG_ERR, "%s: (get broadaddr)",
 177                                         sdl->sdl_data);
 178                                 continue;
 179                         }
 180                         ifs.int_dstaddr = *brdaddr;
 181                 }
 182                 if (ifs.int_flags & IFF_LOOPBACK) {
 183                         ifs.int_dstaddr = ifs.int_addr;
 184                 }
 185                 /*
 186                  * already known to us?
 187                  * what makes a POINTOPOINT if unique is its dst addr,
 188                  * NOT its source address
 189                  */
 190                 if ( ((ifs.int_flags & IFF_POINTOPOINT) &&
 191                         if_ifwithdstaddr(&ifs.int_dstaddr)) ||
 192                         ( ((ifs.int_flags & IFF_POINTOPOINT) == 0) &&
 193                         if_ifwithaddr(&ifs.int_addr)))
 194                         continue;
 195                 ifp = (struct interface *)
 196                         malloc(sdl->sdl_nlen + 1 + sizeof(ifs));
 197                 if (ifp == 0) {
 198                         syslog(LOG_ERR, "IPXrouted: out of memory\n");
 199                         lookforinterfaces = 1;
 200                         break;
 201                 }
 202                 *ifp = ifs;
 203                 /*
 204                  * Count the # of directly connected networks
 205                  * and point to point links which aren't looped
 206                  * back to ourself.  This is used below to
 207                  * decide if we should be a routing ``supplier''.
 208                  */
 209                 if ((ifs.int_flags & IFF_POINTOPOINT) == 0 ||
 210                     if_ifwithaddr(&ifs.int_dstaddr) == 0)
 211                         externalinterfaces++;
 212                 /*
 213                  * If we have a point-to-point link, we want to act
 214                  * as a supplier even if it's our only interface,
 215                  * as that's the only way our peer on the other end
 216                  * can tell that the link is up.
 217                  */
 218                 if ((ifs.int_flags & IFF_POINTOPOINT) && supplier < 0)
 219                         supplier = 1;
 220                 ifp->int_name = (char *)(ifp + 1);
 221                 strcpy(ifp->int_name, sdl->sdl_data);
 222
 223                 ifp->int_metric = ifam->ifam_metric;
 224                 ifp->int_next = ifnet;
 225                 ifnet = ifp;
 226                 traceinit(ifp);
 227                 addrouteforif(ifp);
 228         }
 229         if (externalinterfaces > 1 && supplier < 0)
 230                 supplier = 1;
 231         free(buf);
 232 }
 233
 234 void
 235 addrouteforif(struct interface *ifp)
 236 {
 237         struct sockaddr_ipx net;
 238         struct sockaddr *dst;
 239         struct rt_entry *rt;
 240
 241         if (ifp->int_flags & IFF_POINTOPOINT) {
 242                 int (*match)();
 243                 struct interface *ifp2 = ifnet;
 244
 245                 dst = &ifp->int_dstaddr;
 246
 247                 /* Search for interfaces with the same net */
 248                 ifp->int_sq.n = ifp->int_sq.p = &(ifp->int_sq);
 249                 match = afswitch[dst->sa_family].af_netmatch;
 250                 if (match)
 251                 for (ifp2 = ifnet; ifp2; ifp2 =ifp2->int_next) {
 252                         if (ifp->int_flags & IFF_POINTOPOINT == 0)
 253                                 continue;
 254                         if ((*match)(&ifp2->int_dstaddr,&ifp->int_dstaddr)) {
 255                                 insque(&ifp2->int_sq,&ifp->int_sq);
 256                                 break;
 257                         }
 258                 }
 259         } else {
 260                 bzero(&net, sizeof(net));
 261                 net.sipx_family = AF_IPX;
 262                 net.sipx_len = sizeof (net);
 263                 net.sipx_addr.x_net = satoipx_addr(ifp->int_broadaddr).x_net;
 264                 dst = (struct sockaddr *)&net;
 265         }
 266         rt = rtlookup(dst);
 267         if (rt)
 268                 rtdelete(rt);
 269         if (tracing)
 270                 fprintf(stderr, "Adding route to interface %s\n", ifp->int_name);
 271         if (ifp->int_transitions++ > 0)
 272                 syslog(LOG_ERR, "re-installing interface %s", ifp->int_name);
 273         rtadd(dst, &ifp->int_addr, ifp->int_metric, 0,
 274                 ifp->int_flags & (IFF_INTERFACE|IFF_PASSIVE|IFF_REMOTE));
 275 }
 276