sys/netproto/ns/ns.c

   1 /*
   2  * Copyright (c) 1984, 1985, 1986, 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)ns.c        8.2 (Berkeley) 11/15/93
  34  * $FreeBSD: src/sys/netns/ns.c,v 1.9 1999/08/28 00:49:47 peter Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/protosw.h>
  42 #include <sys/errno.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45
  46 #include <net/if.h>
  47 #include <net/route.h>
  48
  49 #include <netns/ns.h>
  50 #include <netns/ns_if.h>
  51
  52 #ifdef NS
  53
  54 struct ns_ifaddr *ns_ifaddr;
  55 int ns_interfaces;
  56 extern struct sockaddr_ns ns_netmask, ns_hostmask;
  57
  58 /*
  59  * Generic internet control operations (ioctl's).
  60  */
  61 /* ARGSUSED */
  62 ns_control(so, cmd, data, ifp)
  63         struct socket *so;
  64         int cmd;
  65         caddr_t data;
  66         register struct ifnet *ifp;
  67 {
  68         register struct ifreq *ifr = (struct ifreq *)data;
  69         register struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
  70         register struct ns_ifaddr *ia;
  71         struct ifaddr *ifa;
  72         struct ns_ifaddr *oia;
  73         int error, dstIsNew, hostIsNew;
  74
  75         /*
  76          * Find address for this interface, if it exists.
  77          */
  78         if (ifp == 0)
  79                 return (EADDRNOTAVAIL);
  80         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
  81                 if (ia->ia_ifp == ifp)
  82                         break;
  83
  84         switch (cmd) {
  85
  86         case SIOCGIFADDR:
  87                 if (ia == (struct ns_ifaddr *)0)
  88                         return (EADDRNOTAVAIL);
  89                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  90                 return (0);
  91
  92
  93         case SIOCGIFBRDADDR:
  94                 if (ia == (struct ns_ifaddr *)0)
  95                         return (EADDRNOTAVAIL);
  96                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  97                         return (EINVAL);
  98                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
  99                 return (0);
 100
 101         case SIOCGIFDSTADDR:
 102                 if (ia == (struct ns_ifaddr *)0)
 103                         return (EADDRNOTAVAIL);
 104                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 105                         return (EINVAL);
 106                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
 107                 return (0);
 108         }
 109
 110         if ((so->so_state & SS_PRIV) == 0)
 111                 return (EPERM);
 112
 113         switch (cmd) {
 114         case SIOCAIFADDR:
 115         case SIOCDIFADDR:
 116                 if (ifra->ifra_addr.sns_family == AF_NS)
 117                     for (oia = ia; ia; ia = ia->ia_next) {
 118                         if (ia->ia_ifp == ifp  &&
 119                             ns_neteq(ia->ia_addr.sns_addr,
 120                                   ifra->ifra_addr.sns_addr))
 121                             break;
 122                     }
 123                 if (cmd == SIOCDIFADDR && ia == 0)
 124                         return (EADDRNOTAVAIL);
 125                 /* FALLTHROUGH */
 126
 127         case SIOCSIFADDR:
 128         case SIOCSIFDSTADDR:
 129                 if (ia == (struct ns_ifaddr *)0) {
 130                         oia = (struct ns_ifaddr *)
 131                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
 132                         if (oia == (struct ns_ifaddr *)NULL)
 133                                 return (ENOBUFS);
 134                         bzero((caddr_t)oia, sizeof(*oia));
 135                         if (ia = ns_ifaddr) {
 136                                 for ( ; ia->ia_next; ia = ia->ia_next)
 137                                         ;
 138                                 ia->ia_next = oia;
 139                         } else
 140                                 ns_ifaddr = oia;
 141                         ia = oia;
 142                         if (ifa = ifp->if_addrlist) {
 143                                 for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
 144                                         ;
 145                                 ifa->ifa_next = (struct ifaddr *) ia;
 146                         } else
 147                                 ifp->if_addrlist = (struct ifaddr *) ia;
 148                         ia->ia_ifp = ifp;
 149                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 150
 151                         ia->ia_ifa.ifa_netmask =
 152                                 (struct sockaddr *)&ns_netmask;
 153
 154                         ia->ia_ifa.ifa_dstaddr =
 155                                 (struct sockaddr *)&ia->ia_dstaddr;
 156                         if (ifp->if_flags & IFF_BROADCAST) {
 157                                 ia->ia_broadaddr.sns_family = AF_NS;
 158                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 159                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 160                         }
 161                         ns_interfaces++;
 162                 }
 163         }
 164
 165         switch (cmd) {
 166                 int error;
 167
 168         case SIOCSIFDSTADDR:
 169                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 170                         return (EINVAL);
 171                 if (ia->ia_flags & IFA_ROUTE) {
 172                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 173                         ia->ia_flags &= ~IFA_ROUTE;
 174                 }
 175                 if (ifp->if_ioctl) {
 176                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
 177                         if (error)
 178                                 return (error);
 179                 }
 180                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
 181                 return (0);
 182
 183         case SIOCSIFADDR:
 184                 return (ns_ifinit(ifp, ia,
 185                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 186
 187         case SIOCDIFADDR:
 188                 ns_ifscrub(ifp, ia);
 189                 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
 190                         ifp->if_addrlist = ifa->ifa_next;
 191                 else {
 192                         while (ifa->ifa_next &&
 193                                (ifa->ifa_next != (struct ifaddr *)ia))
 194                                     ifa = ifa->ifa_next;
 195                         if (ifa->ifa_next)
 196                             ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
 197                         else
 198                                 printf("Couldn't unlink nsifaddr from ifp\n");
 199                 }
 200                 oia = ia;
 201                 if (oia == (ia = ns_ifaddr)) {
 202                         ns_ifaddr = ia->ia_next;
 203                 } else {
 204                         while (ia->ia_next && (ia->ia_next != oia)) {
 205                                 ia = ia->ia_next;
 206                         }
 207                         if (ia->ia_next)
 208                             ia->ia_next = oia->ia_next;
 209                         else
 210                                 printf("Didn't unlink nsifadr from list\n");
 211                 }
 212                 IFAFREE((&oia->ia_ifa));
 213                 if (0 == --ns_interfaces) {
 214                         /*
 215                          * We reset to virginity and start all over again
 216                          */
 217                         ns_thishost = ns_zerohost;
 218                 }
 219                 return (0);
 220
 221         case SIOCAIFADDR:
 222                 dstIsNew = 0; hostIsNew = 1;
 223                 if (ia->ia_addr.sns_family == AF_NS) {
 224                         if (ifra->ifra_addr.sns_len == 0) {
 225                                 ifra->ifra_addr = ia->ia_addr;
 226                                 hostIsNew = 0;
 227                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 228                                          ia->ia_addr.sns_addr))
 229                                 hostIsNew = 0;
 230                 }
 231                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 232                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 233                         if (hostIsNew == 0)
 234                                 ns_ifscrub(ifp, ia);
 235                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 236                         dstIsNew  = 1;
 237                 }
 238                 if (ifra->ifra_addr.sns_family == AF_NS &&
 239                                             (hostIsNew || dstIsNew))
 240                         error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 241                 return (error);
 242
 243         default:
 244                 if (ifp->if_ioctl == 0)
 245                         return (EOPNOTSUPP);
 246                 return ((*ifp->if_ioctl)(ifp, cmd, data));
 247         }
 248 }
 249
 250 /*
 251 * Delete any previous route for an old address.
 252 */
 253 ns_ifscrub(ifp, ia)
 254         register struct ifnet *ifp;
 255         register struct ns_ifaddr *ia;
 256 {
 257         if (ia->ia_flags & IFA_ROUTE) {
 258                 if (ifp->if_flags & IFF_POINTOPOINT) {
 259                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 260                 } else
 261                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 262                 ia->ia_flags &= ~IFA_ROUTE;
 263         }
 264 }
 265 /*
 266  * Initialize an interface's internet address
 267  * and routing table entry.
 268  */
 269 ns_ifinit(ifp, ia, sns, scrub)
 270         register struct ifnet *ifp;
 271         register struct ns_ifaddr *ia;
 272         register struct sockaddr_ns *sns;
 273 {
 274         struct sockaddr_ns oldaddr;
 275         register union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 276         int s = splimp(), error;
 277
 278         /*
 279          * Set up new addresses.
 280          */
 281         oldaddr = ia->ia_addr;
 282         ia->ia_addr = *sns;
 283         /*
 284          * The convention we shall adopt for naming is that
 285          * a supplied address of zero means that "we don't care".
 286          * if there is a single interface, use the address of that
 287          * interface as our 6 byte host address.
 288          * if there are multiple interfaces, use any address already
 289          * used.
 290          *
 291          * Give the interface a chance to initialize
 292          * if this is its first address,
 293          * and to validate the address if necessary.
 294          */
 295         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 296                 if (ifp->if_ioctl &&
 297                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
 298                         ia->ia_addr = oldaddr;
 299                         splx(s);
 300                         return (error);
 301                 }
 302                 ns_thishost = *h;
 303         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 304             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 305                 *h = ns_thishost;
 306                 if (ifp->if_ioctl &&
 307                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
 308                         ia->ia_addr = oldaddr;
 309                         splx(s);
 310                         return (error);
 311                 }
 312                 if (!ns_hosteqnh(ns_thishost,*h)) {
 313                         ia->ia_addr = oldaddr;
 314                         splx(s);
 315                         return (EINVAL);
 316                 }
 317         } else {
 318                 ia->ia_addr = oldaddr;
 319                 splx(s);
 320                 return (EINVAL);
 321         }
 322         ia->ia_ifa.ifa_metric = ifp->if_metric;
 323         /*
 324          * Add route for the network.
 325          */
 326         if (scrub) {
 327                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 328                 ns_ifscrub(ifp, ia);
 329                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 330         }
 331         if (ifp->if_flags & IFF_POINTOPOINT)
 332                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 333         else {
 334                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 335                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 336         }
 337         ia->ia_flags |= IFA_ROUTE;
 338         return (0);
 339 }
 340
 341 /*
 342  * Return address info for specified internet network.
 343  */
 344 struct ns_ifaddr *
 345 ns_iaonnetof(dst)
 346         register struct ns_addr *dst;
 347 {
 348         register struct ns_ifaddr *ia;
 349         register struct ns_addr *compare;
 350         register struct ifnet *ifp;
 351         struct ns_ifaddr *ia_maybe = 0;
 352         union ns_net net = dst->x_net;
 353
 354         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 355                 if (ifp = ia->ia_ifp) {
 356                         if (ifp->if_flags & IFF_POINTOPOINT) {
 357                                 compare = &satons_addr(ia->ia_dstaddr);
 358                                 if (ns_hosteq(*dst, *compare))
 359                                         return (ia);
 360                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 361                                         ia_maybe = ia;
 362                         } else {
 363                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 364                                         return (ia);
 365                         }
 366                 }
 367         }
 368         return (ia_maybe);
 369 }
 370 #endif