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 1.9 2004/06/07 07:04:33 dillon Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/malloc.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/sockio.h>
  43 #include <sys/protosw.h>
  44 #include <sys/errno.h>
  45 #include <sys/socket.h>
  46 #include <sys/socketvar.h>
  47
  48 #include <net/if.h>
  49 #include <net/route.h>
  50
  51 #include "ns.h"
  52 #include "ns_if.h"
  53
  54 #include "opt_ns.h"
  55
  56 #ifdef NS
  57
  58 struct ns_ifaddr *ns_ifaddr;
  59 int ns_interfaces;
  60
  61 extern struct sockaddr_ns ns_netmask, ns_hostmask;
  62
  63 /*
  64  * Generic internet control operations (ioctl's).
  65  */
  66 /* ARGSUSED */
  67 int
  68 ns_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
  69         struct thread *td)
  70 {
  71         struct ifreq *ifr = (struct ifreq *)data;
  72         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
  73         struct ns_ifaddr *ia;
  74         struct ifaddr *ifa = NULL; /* XXX used ininitialized ?*/
  75         struct ns_ifaddr *oia;
  76         int dstIsNew, hostIsNew;
  77         int error = 0; /* initalize because of scoping */
  78
  79         /*
  80          * Find address for this interface, if it exists.
  81          */
  82         if (ifp == 0)
  83                 return (EADDRNOTAVAIL);
  84         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
  85                 if (ia->ia_ifp == ifp)
  86                         break;
  87
  88         switch (cmd) {
  89
  90         case SIOCGIFADDR:
  91                 if (ia == (struct ns_ifaddr *)0)
  92                         return (EADDRNOTAVAIL);
  93                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  94                 return (0);
  95
  96
  97         case SIOCGIFBRDADDR:
  98                 if (ia == (struct ns_ifaddr *)0)
  99                         return (EADDRNOTAVAIL);
 100                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 101                         return (EINVAL);
 102                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
 103                 return (0);
 104
 105         case SIOCGIFDSTADDR:
 106                 if (ia == (struct ns_ifaddr *)0)
 107                         return (EADDRNOTAVAIL);
 108                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 109                         return (EINVAL);
 110                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
 111                 return (0);
 112         }
 113
 114 #ifdef NS_PRIV_SOCKETS
 115         if ((so->so_state & SS_PRIV) == 0)
 116                 return (EPERM);
 117 #endif
 118
 119         switch (cmd) {
 120         case SIOCAIFADDR:
 121         case SIOCDIFADDR:
 122                 if (ifra->ifra_addr.sns_family == AF_NS)
 123                     for (oia = ia; ia; ia = ia->ia_next) {
 124                         if (ia->ia_ifp == ifp  &&
 125                             ns_neteq(ia->ia_addr.sns_addr,
 126                                   ifra->ifra_addr.sns_addr))
 127                             break;
 128                     }
 129                 if (cmd == SIOCDIFADDR && ia == 0)
 130                         return (EADDRNOTAVAIL);
 131                 /* FALLTHROUGH */
 132
 133         case SIOCSIFADDR:
 134         case SIOCSIFDSTADDR:
 135                 if (ia == (struct ns_ifaddr *)0) {
 136                         oia = (struct ns_ifaddr *)
 137                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
 138                         if (oia == (struct ns_ifaddr *)NULL)
 139                                 return (ENOBUFS);
 140                         bzero((caddr_t)oia, sizeof(*oia));
 141                         if ((ia = ns_ifaddr) != NULL) {
 142                                 for ( ; ia->ia_next; ia = ia->ia_next)
 143                                         ;
 144                                 ia->ia_next = oia;
 145                         } else
 146                                 ns_ifaddr = oia;
 147                         ia = oia;
 148
 149                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 150                         ia->ia_ifp = ifp;
 151                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 152
 153                         ia->ia_ifa.ifa_netmask =
 154                                 (struct sockaddr *)&ns_netmask;
 155
 156                         ia->ia_ifa.ifa_dstaddr =
 157                                 (struct sockaddr *)&ia->ia_dstaddr;
 158                         if (ifp->if_flags & IFF_BROADCAST) {
 159                                 ia->ia_broadaddr.sns_family = AF_NS;
 160                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 161                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 162                         }
 163                         ns_interfaces++;
 164                 }
 165         }
 166
 167         switch (cmd) {
 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,
 177                                                         (caddr_t)ia,
 178                                                         (struct ucred *)NULL);
 179                         if (error)
 180                                 return (error);
 181                 }
 182                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
 183                 return (0);
 184
 185         case SIOCSIFADDR:
 186                 return (ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 187                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 188
 189         case SIOCDIFADDR:
 190                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 191                 /* XXX not on list */
 192                 oia = ia;
 193                 TAILQ_REMOVE(&ifp->if_addrhead, (struct ifaddr *)ia, ifa_link);
 194                 if (oia == (ia = ns_ifaddr)) {
 195                         ns_ifaddr = ia->ia_next;
 196                 } else {
 197                         while (ia->ia_next && (ia->ia_next != oia)) {
 198                                 ia = ia->ia_next;
 199                         }
 200                         if (ia->ia_next)
 201                             ia->ia_next = oia->ia_next;
 202                         else
 203                                 printf("Didn't unlink nsifadr from list\n");
 204                 }
 205                 IFAFREE((&oia->ia_ifa));
 206                 if (0 == --ns_interfaces) {
 207                         /*
 208                          * We reset to virginity and start all over again
 209                          */
 210                         ns_thishost = ns_zerohost;
 211                 }
 212                 return (0);
 213
 214         case SIOCAIFADDR:
 215                 dstIsNew = 0; hostIsNew = 1;
 216                 if (ia->ia_addr.sns_family == AF_NS) {
 217                         if (ifra->ifra_addr.sns_len == 0) {
 218                                 ifra->ifra_addr = ia->ia_addr;
 219                                 hostIsNew = 0;
 220                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 221                                          ia->ia_addr.sns_addr))
 222                                 hostIsNew = 0;
 223                 }
 224                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 225                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 226                         if (hostIsNew == 0)
 227                                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 228                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 229                         dstIsNew  = 1;
 230                 }
 231                 if (ifra->ifra_addr.sns_family == AF_NS &&
 232                                             (hostIsNew || dstIsNew))
 233                         error = ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 234                                                 &ifra->ifra_addr, 0);
 235                 return (error);
 236
 237         default:
 238                 if (ifp->if_ioctl == 0)
 239                         return (EOPNOTSUPP);
 240                 return ((*ifp->if_ioctl)(ifp, cmd, data, (struct ucred *)NULL));
 241         }
 242 }
 243
 244 /*
 245 * Delete any previous route for an old address.
 246 */
 247 void
 248 ns_ifscrub(ifp, ia)
 249         struct ifnet *ifp;
 250         struct ns_ifaddr *ia;
 251 {
 252         if (ia->ia_flags & IFA_ROUTE) {
 253                 if (ifp->if_flags & IFF_POINTOPOINT) {
 254                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 255                 } else
 256                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 257                 ia->ia_flags &= ~IFA_ROUTE;
 258         }
 259 }
 260 /*
 261  * Initialize an interface's internet address
 262  * and routing table entry.
 263  */
 264 int
 265 ns_ifinit(ifp, ia, sns, scrub)
 266         struct ifnet *ifp;
 267         struct ns_ifaddr *ia;
 268         struct sockaddr_ns *sns;
 269         int scrub;
 270 {
 271         struct sockaddr_ns oldaddr;
 272         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 273         int s = splimp(), error;
 274
 275         /*
 276          * Set up new addresses.
 277          */
 278         oldaddr = ia->ia_addr;
 279         ia->ia_addr = *sns;
 280         /*
 281          * The convention we shall adopt for naming is that
 282          * a supplied address of zero means that "we don't care".
 283          * if there is a single interface, use the address of that
 284          * interface as our 6 byte host address.
 285          * if there are multiple interfaces, use any address already
 286          * used.
 287          *
 288          * Give the interface a chance to initialize
 289          * if this is its first address,
 290          * and to validate the address if necessary.
 291          */
 292         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 293                 if (ifp->if_ioctl &&
 294                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
 295                                                 (caddr_t)ia,
 296                                                 (struct ucred *)NULL))) {
 297                         ia->ia_addr = oldaddr;
 298                         splx(s);
 299                         return (error);
 300                 }
 301                 ns_thishost = *h;
 302         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 303             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 304                 *h = ns_thishost;
 305                 if (ifp->if_ioctl &&
 306                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
 307                                                 (caddr_t)ia,
 308                                                 (struct ucred *)NULL))) {
 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) != NULL) {
 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