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 1.7 2004/03/23 22:19:08 hsu 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/ioctl.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(so, cmd, data, ifp)
  69         struct socket *so;
  70         int cmd;
  71         caddr_t data;
  72         struct ifnet *ifp;
  73 {
  74         struct ifreq *ifr = (struct ifreq *)data;
  75         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
  76         struct ns_ifaddr *ia;
  77         struct ifaddr *ifa = NULL; /* XXX used ininitialized ?*/
  78         struct ns_ifaddr *oia;
  79         int dstIsNew, hostIsNew;
  80         int error = 0; /* initalize because of scoping */
  81
  82         /*
  83          * Find address for this interface, if it exists.
  84          */
  85         if (ifp == 0)
  86                 return (EADDRNOTAVAIL);
  87         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
  88                 if (ia->ia_ifp == ifp)
  89                         break;
  90
  91         switch (cmd) {
  92
  93         case SIOCGIFADDR:
  94                 if (ia == (struct ns_ifaddr *)0)
  95                         return (EADDRNOTAVAIL);
  96                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  97                 return (0);
  98
  99
 100         case SIOCGIFBRDADDR:
 101                 if (ia == (struct ns_ifaddr *)0)
 102                         return (EADDRNOTAVAIL);
 103                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 104                         return (EINVAL);
 105                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
 106                 return (0);
 107
 108         case SIOCGIFDSTADDR:
 109                 if (ia == (struct ns_ifaddr *)0)
 110                         return (EADDRNOTAVAIL);
 111                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 112                         return (EINVAL);
 113                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
 114                 return (0);
 115         }
 116
 117 #ifdef NS_PRIV_SOCKETS
 118         if ((so->so_state & SS_PRIV) == 0)
 119                 return (EPERM);
 120 #endif
 121
 122         switch (cmd) {
 123         case SIOCAIFADDR:
 124         case SIOCDIFADDR:
 125                 if (ifra->ifra_addr.sns_family == AF_NS)
 126                     for (oia = ia; ia; ia = ia->ia_next) {
 127                         if (ia->ia_ifp == ifp  &&
 128                             ns_neteq(ia->ia_addr.sns_addr,
 129                                   ifra->ifra_addr.sns_addr))
 130                             break;
 131                     }
 132                 if (cmd == SIOCDIFADDR && ia == 0)
 133                         return (EADDRNOTAVAIL);
 134                 /* FALLTHROUGH */
 135
 136         case SIOCSIFADDR:
 137         case SIOCSIFDSTADDR:
 138                 if (ia == (struct ns_ifaddr *)0) {
 139                         oia = (struct ns_ifaddr *)
 140                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
 141                         if (oia == (struct ns_ifaddr *)NULL)
 142                                 return (ENOBUFS);
 143                         bzero((caddr_t)oia, sizeof(*oia));
 144                         if ((ia = ns_ifaddr) != NULL) {
 145                                 for ( ; ia->ia_next; ia = ia->ia_next)
 146                                         ;
 147                                 ia->ia_next = oia;
 148                         } else
 149                                 ns_ifaddr = oia;
 150                         ia = oia;
 151
 152                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 153                         ia->ia_ifp = ifp;
 154                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 155
 156                         ia->ia_ifa.ifa_netmask =
 157                                 (struct sockaddr *)&ns_netmask;
 158
 159                         ia->ia_ifa.ifa_dstaddr =
 160                                 (struct sockaddr *)&ia->ia_dstaddr;
 161                         if (ifp->if_flags & IFF_BROADCAST) {
 162                                 ia->ia_broadaddr.sns_family = AF_NS;
 163                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 164                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 165                         }
 166                         ns_interfaces++;
 167                 }
 168         }
 169
 170         switch (cmd) {
 171         case SIOCSIFDSTADDR:
 172                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 173                         return (EINVAL);
 174                 if (ia->ia_flags & IFA_ROUTE) {
 175                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 176                         ia->ia_flags &= ~IFA_ROUTE;
 177                 }
 178                 if (ifp->if_ioctl) {
 179                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
 180                                                         (caddr_t)ia,
 181                                                         (struct ucred *)NULL);
 182                         if (error)
 183                                 return (error);
 184                 }
 185                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
 186                 return (0);
 187
 188         case SIOCSIFADDR:
 189                 return (ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 190                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 191
 192         case SIOCDIFADDR:
 193                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 194                 /* XXX not on list */
 195                 oia = ia;
 196                 TAILQ_REMOVE(&ifp->if_addrhead, (struct ifaddr *)ia, ifa_link);
 197                 if (oia == (ia = ns_ifaddr)) {
 198                         ns_ifaddr = ia->ia_next;
 199                 } else {
 200                         while (ia->ia_next && (ia->ia_next != oia)) {
 201                                 ia = ia->ia_next;
 202                         }
 203                         if (ia->ia_next)
 204                             ia->ia_next = oia->ia_next;
 205                         else
 206                                 printf("Didn't unlink nsifadr from list\n");
 207                 }
 208                 IFAFREE((&oia->ia_ifa));
 209                 if (0 == --ns_interfaces) {
 210                         /*
 211                          * We reset to virginity and start all over again
 212                          */
 213                         ns_thishost = ns_zerohost;
 214                 }
 215                 return (0);
 216
 217         case SIOCAIFADDR:
 218                 dstIsNew = 0; hostIsNew = 1;
 219                 if (ia->ia_addr.sns_family == AF_NS) {
 220                         if (ifra->ifra_addr.sns_len == 0) {
 221                                 ifra->ifra_addr = ia->ia_addr;
 222                                 hostIsNew = 0;
 223                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 224                                          ia->ia_addr.sns_addr))
 225                                 hostIsNew = 0;
 226                 }
 227                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 228                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 229                         if (hostIsNew == 0)
 230                                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 231                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 232                         dstIsNew  = 1;
 233                 }
 234                 if (ifra->ifra_addr.sns_family == AF_NS &&
 235                                             (hostIsNew || dstIsNew))
 236                         error = ns_ifinit(ifp, (struct ns_ifra_addr *)ia,
 237                                                 &ifra->ifra_addr, 0);
 238                 return (error);
 239
 240         default:
 241                 if (ifp->if_ioctl == 0)
 242                         return (EOPNOTSUPP);
 243                 return ((*ifp->if_ioctl)(ifp, cmd, data, (struct ucred *)NULL));
 244         }
 245 }
 246
 247 /*
 248 * Delete any previous route for an old address.
 249 */
 250 void
 251 ns_ifscrub(ifp, ia)
 252         struct ifnet *ifp;
 253         struct ns_ifaddr *ia;
 254 {
 255         if (ia->ia_flags & IFA_ROUTE) {
 256                 if (ifp->if_flags & IFF_POINTOPOINT) {
 257                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 258                 } else
 259                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 260                 ia->ia_flags &= ~IFA_ROUTE;
 261         }
 262 }
 263 /*
 264  * Initialize an interface's internet address
 265  * and routing table entry.
 266  */
 267 int
 268 ns_ifinit(ifp, ia, sns, scrub)
 269         struct ifnet *ifp;
 270         struct ns_ifaddr *ia;
 271         struct sockaddr_ns *sns;
 272         int scrub;
 273 {
 274         struct sockaddr_ns oldaddr;
 275         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,
 298                                                 (caddr_t)ia,
 299                                                 (struct ucred *)NULL))) {
 300                         ia->ia_addr = oldaddr;
 301                         splx(s);
 302                         return (error);
 303                 }
 304                 ns_thishost = *h;
 305         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 306             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 307                 *h = ns_thishost;
 308                 if (ifp->if_ioctl &&
 309                      (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR,
 310                                                 (caddr_t)ia,
 311                                                 (struct ucred *)NULL))) {
 312                         ia->ia_addr = oldaddr;
 313                         splx(s);
 314                         return (error);
 315                 }
 316                 if (!ns_hosteqnh(ns_thishost,*h)) {
 317                         ia->ia_addr = oldaddr;
 318                         splx(s);
 319                         return (EINVAL);
 320                 }
 321         } else {
 322                 ia->ia_addr = oldaddr;
 323                 splx(s);
 324                 return (EINVAL);
 325         }
 326         ia->ia_ifa.ifa_metric = ifp->if_metric;
 327         /*
 328          * Add route for the network.
 329          */
 330         if (scrub) {
 331                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 332                 ns_ifscrub(ifp, ia);
 333                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 334         }
 335         if (ifp->if_flags & IFF_POINTOPOINT)
 336                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 337         else {
 338                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 339                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 340         }
 341         ia->ia_flags |= IFA_ROUTE;
 342         return (0);
 343 }
 344
 345 /*
 346  * Return address info for specified internet network.
 347  */
 348 struct ns_ifaddr *
 349 ns_iaonnetof(dst)
 350         struct ns_addr *dst;
 351 {
 352         struct ns_ifaddr *ia;
 353         struct ns_addr *compare;
 354         struct ifnet *ifp;
 355         struct ns_ifaddr *ia_maybe = 0;
 356         union ns_net net = dst->x_net;
 357
 358         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 359                 if ((ifp = ia->ia_ifp) != NULL) {
 360                         if (ifp->if_flags & IFF_POINTOPOINT) {
 361                                 compare = &satons_addr(ia->ia_dstaddr);
 362                                 if (ns_hosteq(*dst, *compare))
 363                                         return (ia);
 364                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 365                                         ia_maybe = ia;
 366                         } else {
 367                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 368                                         return (ia);
 369                         }
 370                 }
 371         }
 372         return (ia_maybe);
 373 }
 374 #endif