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  * $DragonFly: src/sys/netproto/ns/ns.c,v 1.4 2003/08/07 21:17:38 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/protosw.h>
  43 #include <sys/errno.h>
  44 #include <sys/socket.h>
  45 #include <sys/socketvar.h>
  46
  47 #include <net/if.h>
  48 #include <net/route.h>
  49
  50 #include "ns.h"
  51 #include "ns_if.h"
  52
  53 #ifdef NS
  54
  55 struct ns_ifaddr *ns_ifaddr;
  56 int ns_interfaces;
  57 extern struct sockaddr_ns ns_netmask, ns_hostmask;
  58
  59 /*
  60  * Generic internet control operations (ioctl's).
  61  */
  62 /* ARGSUSED */
  63 ns_control(so, cmd, data, ifp)
  64         struct socket *so;
  65         int cmd;
  66         caddr_t data;
  67         struct ifnet *ifp;
  68 {
  69         struct ifreq *ifr = (struct ifreq *)data;
  70         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
  71         struct ns_ifaddr *ia;
  72         struct ifaddr *ifa;
  73         struct ns_ifaddr *oia;
  74         int error, dstIsNew, hostIsNew;
  75
  76         /*
  77          * Find address for this interface, if it exists.
  78          */
  79         if (ifp == 0)
  80                 return (EADDRNOTAVAIL);
  81         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
  82                 if (ia->ia_ifp == ifp)
  83                         break;
  84
  85         switch (cmd) {
  86
  87         case SIOCGIFADDR:
  88                 if (ia == (struct ns_ifaddr *)0)
  89                         return (EADDRNOTAVAIL);
  90                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  91                 return (0);
  92
  93
  94         case SIOCGIFBRDADDR:
  95                 if (ia == (struct ns_ifaddr *)0)
  96                         return (EADDRNOTAVAIL);
  97                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  98                         return (EINVAL);
  99                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
 100                 return (0);
 101
 102         case SIOCGIFDSTADDR:
 103                 if (ia == (struct ns_ifaddr *)0)
 104                         return (EADDRNOTAVAIL);
 105                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 106                         return (EINVAL);
 107                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
 108                 return (0);
 109         }
 110
 111         if ((so->so_state & SS_PRIV) == 0)
 112                 return (EPERM);
 113
 114         switch (cmd) {
 115         case SIOCAIFADDR:
 116         case SIOCDIFADDR:
 117                 if (ifra->ifra_addr.sns_family == AF_NS)
 118                     for (oia = ia; ia; ia = ia->ia_next) {
 119                         if (ia->ia_ifp == ifp  &&
 120                             ns_neteq(ia->ia_addr.sns_addr,
 121                                   ifra->ifra_addr.sns_addr))
 122                             break;
 123                     }
 124                 if (cmd == SIOCDIFADDR && ia == 0)
 125                         return (EADDRNOTAVAIL);
 126                 /* FALLTHROUGH */
 127
 128         case SIOCSIFADDR:
 129         case SIOCSIFDSTADDR:
 130                 if (ia == (struct ns_ifaddr *)0) {
 131                         oia = (struct ns_ifaddr *)
 132                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
 133                         if (oia == (struct ns_ifaddr *)NULL)
 134                                 return (ENOBUFS);
 135                         bzero((caddr_t)oia, sizeof(*oia));
 136                         if (ia = ns_ifaddr) {
 137                                 for ( ; ia->ia_next; ia = ia->ia_next)
 138                                         ;
 139                                 ia->ia_next = oia;
 140                         } else
 141                                 ns_ifaddr = oia;
 142                         ia = oia;
 143                         if (ifa = ifp->if_addrlist) {
 144                                 for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
 145                                         ;
 146                                 ifa->ifa_next = (struct ifaddr *) ia;
 147                         } else
 148                                 ifp->if_addrlist = (struct ifaddr *) ia;
 149                         ia->ia_ifp = ifp;
 150                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 151
 152                         ia->ia_ifa.ifa_netmask =
 153                                 (struct sockaddr *)&ns_netmask;
 154
 155                         ia->ia_ifa.ifa_dstaddr =
 156                                 (struct sockaddr *)&ia->ia_dstaddr;
 157                         if (ifp->if_flags & IFF_BROADCAST) {
 158                                 ia->ia_broadaddr.sns_family = AF_NS;
 159                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 160                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 161                         }
 162                         ns_interfaces++;
 163                 }
 164         }
 165
 166         switch (cmd) {
 167                 int error;
 168
 169         case SIOCSIFDSTADDR:
 170                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 171                         return (EINVAL);
 172                 if (ia->ia_flags & IFA_ROUTE) {
 173                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 174                         ia->ia_flags &= ~IFA_ROUTE;
 175                 }
 176                 if (ifp->if_ioctl) {
 177                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia);
 178                         if (error)
 179                                 return (error);
 180                 }
 181                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
 182                 return (0);
 183
 184         case SIOCSIFADDR:
 185                 return (ns_ifinit(ifp, ia,
 186                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 187
 188         case SIOCDIFADDR:
 189                 ns_ifscrub(ifp, ia);
 190                 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
 191                         ifp->if_addrlist = ifa->ifa_next;
 192                 else {
 193                         while (ifa->ifa_next &&
 194                                (ifa->ifa_next != (struct ifaddr *)ia))
 195                                     ifa = ifa->ifa_next;
 196                         if (ifa->ifa_next)
 197                             ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
 198                         else
 199                                 printf("Couldn't unlink nsifaddr from ifp\n");
 200                 }
 201                 oia = ia;
 202                 if (oia == (ia = ns_ifaddr)) {
 203                         ns_ifaddr = ia->ia_next;
 204                 } else {
 205                         while (ia->ia_next && (ia->ia_next != oia)) {
 206                                 ia = ia->ia_next;
 207                         }
 208                         if (ia->ia_next)
 209                             ia->ia_next = oia->ia_next;
 210                         else
 211                                 printf("Didn't unlink nsifadr from list\n");
 212                 }
 213                 IFAFREE((&oia->ia_ifa));
 214                 if (0 == --ns_interfaces) {
 215                         /*
 216                          * We reset to virginity and start all over again
 217                          */
 218                         ns_thishost = ns_zerohost;
 219                 }
 220                 return (0);
 221
 222         case SIOCAIFADDR:
 223                 dstIsNew = 0; hostIsNew = 1;
 224                 if (ia->ia_addr.sns_family == AF_NS) {
 225                         if (ifra->ifra_addr.sns_len == 0) {
 226                                 ifra->ifra_addr = ia->ia_addr;
 227                                 hostIsNew = 0;
 228                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 229                                          ia->ia_addr.sns_addr))
 230                                 hostIsNew = 0;
 231                 }
 232                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 233                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 234                         if (hostIsNew == 0)
 235                                 ns_ifscrub(ifp, ia);
 236                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 237                         dstIsNew  = 1;
 238                 }
 239                 if (ifra->ifra_addr.sns_family == AF_NS &&
 240                                             (hostIsNew || dstIsNew))
 241                         error = ns_ifinit(ifp, ia, &ifra->ifra_addr, 0);
 242                 return (error);
 243
 244         default:
 245                 if (ifp->if_ioctl == 0)
 246                         return (EOPNOTSUPP);
 247                 return ((*ifp->if_ioctl)(ifp, cmd, data));
 248         }
 249 }
 250
 251 /*
 252 * Delete any previous route for an old address.
 253 */
 254 ns_ifscrub(ifp, ia)
 255         struct ifnet *ifp;
 256         struct ns_ifaddr *ia;
 257 {
 258         if (ia->ia_flags & IFA_ROUTE) {
 259                 if (ifp->if_flags & IFF_POINTOPOINT) {
 260                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 261                 } else
 262                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 263                 ia->ia_flags &= ~IFA_ROUTE;
 264         }
 265 }
 266 /*
 267  * Initialize an interface's internet address
 268  * and routing table entry.
 269  */
 270 ns_ifinit(ifp, ia, sns, scrub)
 271         struct ifnet *ifp;
 272         struct ns_ifaddr *ia;
 273         struct sockaddr_ns *sns;
 274 {
 275         struct sockaddr_ns oldaddr;
 276         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 277         int s = splimp(), error;
 278
 279         /*
 280          * Set up new addresses.
 281          */
 282         oldaddr = ia->ia_addr;
 283         ia->ia_addr = *sns;
 284         /*
 285          * The convention we shall adopt for naming is that
 286          * a supplied address of zero means that "we don't care".
 287          * if there is a single interface, use the address of that
 288          * interface as our 6 byte host address.
 289          * if there are multiple interfaces, use any address already
 290          * used.
 291          *
 292          * Give the interface a chance to initialize
 293          * if this is its first address,
 294          * and to validate the address if necessary.
 295          */
 296         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 297                 if (ifp->if_ioctl &&
 298                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
 299                         ia->ia_addr = oldaddr;
 300                         splx(s);
 301                         return (error);
 302                 }
 303                 ns_thishost = *h;
 304         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 305             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 306                 *h = ns_thishost;
 307                 if (ifp->if_ioctl &&
 308                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) {
 309                         ia->ia_addr = oldaddr;
 310                         splx(s);
 311                         return (error);
 312                 }
 313                 if (!ns_hosteqnh(ns_thishost,*h)) {
 314                         ia->ia_addr = oldaddr;
 315                         splx(s);
 316                         return (EINVAL);
 317                 }
 318         } else {
 319                 ia->ia_addr = oldaddr;
 320                 splx(s);
 321                 return (EINVAL);
 322         }
 323         ia->ia_ifa.ifa_metric = ifp->if_metric;
 324         /*
 325          * Add route for the network.
 326          */
 327         if (scrub) {
 328                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 329                 ns_ifscrub(ifp, ia);
 330                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 331         }
 332         if (ifp->if_flags & IFF_POINTOPOINT)
 333                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 334         else {
 335                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 336                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 337         }
 338         ia->ia_flags |= IFA_ROUTE;
 339         return (0);
 340 }
 341
 342 /*
 343  * Return address info for specified internet network.
 344  */
 345 struct ns_ifaddr *
 346 ns_iaonnetof(dst)
 347         struct ns_addr *dst;
 348 {
 349         struct ns_ifaddr *ia;
 350         struct ns_addr *compare;
 351         struct ifnet *ifp;
 352         struct ns_ifaddr *ia_maybe = 0;
 353         union ns_net net = dst->x_net;
 354
 355         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 356                 if (ifp = ia->ia_ifp) {
 357                         if (ifp->if_flags & IFF_POINTOPOINT) {
 358                                 compare = &satons_addr(ia->ia_dstaddr);
 359                                 if (ns_hosteq(*dst, *compare))
 360                                         return (ia);
 361                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 362                                         ia_maybe = ia;
 363                         } else {
 364                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 365                                         return (ia);
 366                         }
 367                 }
 368         }
 369         return (ia_maybe);
 370 }
 371 #endif