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 1.17 2008/03/07 11:34:21 sephe 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 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/route.h>
  51
  52 #include "ns.h"
  53 #include "ns_if.h"
  54
  55 #include "opt_ns.h"
  56
  57 #ifdef NS
  58
  59 struct ns_ifaddr *ns_ifaddr;
  60 int ns_interfaces;
  61
  62 extern struct sockaddr_ns ns_netmask, ns_hostmask;
  63
  64 /*
  65  * Generic internet control operations (ioctl's).
  66  */
  67 /* ARGSUSED */
  68 int
  69 ns_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
  70         struct thread *td)
  71 {
  72         struct ifreq *ifr = (struct ifreq *)data;
  73         struct ns_aliasreq *ifra = (struct ns_aliasreq *)data;
  74         struct ns_ifaddr *ia;
  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 == NULL)
  92                         return (EADDRNOTAVAIL);
  93                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  94                 return (0);
  95
  96
  97         case SIOCGIFBRDADDR:
  98                 if (ia == NULL)
  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 == NULL)
 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 == NULL) {
 136                         oia = ifa_create(sizeof(*ia), M_WAITOK);
 137                         if ((ia = ns_ifaddr) != NULL) {
 138                                 for ( ; ia->ia_next; ia = ia->ia_next)
 139                                         ;
 140                                 ia->ia_next = oia;
 141                         } else
 142                                 ns_ifaddr = oia;
 143                         ia = oia;
 144
 145                         ifa_iflink(&ia->ia_ifa, ifp, 1);
 146                         ia->ia_ifp = ifp;
 147                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 148
 149                         ia->ia_ifa.ifa_netmask =
 150                                 (struct sockaddr *)&ns_netmask;
 151
 152                         ia->ia_ifa.ifa_dstaddr =
 153                                 (struct sockaddr *)&ia->ia_dstaddr;
 154                         if (ifp->if_flags & IFF_BROADCAST) {
 155                                 ia->ia_broadaddr.sns_family = AF_NS;
 156                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 157                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 158                         }
 159                         ns_interfaces++;
 160                 }
 161         }
 162
 163         switch (cmd) {
 164         case SIOCSIFDSTADDR:
 165                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 166                         return (EINVAL);
 167                 if (ia->ia_flags & IFA_ROUTE) {
 168                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 169                         ia->ia_flags &= ~IFA_ROUTE;
 170                 }
 171                 if (ifp->if_ioctl) {
 172                         ifnet_serialize_all(ifp);
 173                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
 174                                               NULL);
 175                         ifnet_deserialize_all(ifp);
 176                         if (error)
 177                                 return (error);
 178                 }
 179                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
 180                 return (0);
 181
 182         case SIOCSIFADDR:
 183                 return (ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 184                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 185
 186         case SIOCDIFADDR:
 187                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 188                 /* XXX not on list */
 189                 oia = ia;
 190                 ifa_ifunlink(&ia->ia_ifa, ifp);
 191                 if (oia == (ia = ns_ifaddr)) {
 192                         ns_ifaddr = ia->ia_next;
 193                 } else {
 194                         while (ia->ia_next && (ia->ia_next != oia)) {
 195                                 ia = ia->ia_next;
 196                         }
 197                         if (ia->ia_next)
 198                             ia->ia_next = oia->ia_next;
 199                         else
 200                                 kprintf("Didn't unlink nsifadr from list\n");
 201                 }
 202                 ifa_destroy(&oia->ia_ifa);
 203                 if (0 == --ns_interfaces) {
 204                         /*
 205                          * We reset to virginity and start all over again
 206                          */
 207                         ns_thishost = ns_zerohost;
 208                 }
 209                 return (0);
 210
 211         case SIOCAIFADDR:
 212                 dstIsNew = 0; hostIsNew = 1;
 213                 if (ia->ia_addr.sns_family == AF_NS) {
 214                         if (ifra->ifra_addr.sns_len == 0) {
 215                                 ifra->ifra_addr = ia->ia_addr;
 216                                 hostIsNew = 0;
 217                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 218                                          ia->ia_addr.sns_addr))
 219                                 hostIsNew = 0;
 220                 }
 221                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 222                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 223                         if (hostIsNew == 0)
 224                                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 225                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 226                         dstIsNew  = 1;
 227                 }
 228                 if (ifra->ifra_addr.sns_family == AF_NS &&
 229                                             (hostIsNew || dstIsNew))
 230                         error = ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 231                                                 &ifra->ifra_addr, 0);
 232                 return (error);
 233
 234         default:
 235                 if (ifp->if_ioctl == 0)
 236                         return (EOPNOTSUPP);
 237                 ifnet_serialize_all(ifp);
 238                 error = ifp->if_ioctl(ifp, cmd, data, NULL);
 239                 ifnet_deserialize_all(ifp);
 240                 return (error);
 241         }
 242 }
 243
 244 /*
 245 * Delete any previous route for an old address.
 246 */
 247 void
 248 ns_ifscrub(struct ifnet *ifp, struct ns_ifaddr *ia)
 249 {
 250         if (ia->ia_flags & IFA_ROUTE) {
 251                 if (ifp->if_flags & IFF_POINTOPOINT) {
 252                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 253                 } else
 254                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 255                 ia->ia_flags &= ~IFA_ROUTE;
 256         }
 257 }
 258 /*
 259  * Initialize an interface's internet address
 260  * and routing table entry.
 261  */
 262 int
 263 ns_ifinit(struct ifnet *ifp, struct ns_ifaddr *ia, struct sockaddr_ns *sns, int scrub)
 264 {
 265         struct sockaddr_ns oldaddr;
 266         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 267         int error;
 268
 269         crit_enter();
 270
 271         /*
 272          * Set up new addresses.
 273          */
 274         oldaddr = ia->ia_addr;
 275         ia->ia_addr = *sns;
 276         /*
 277          * The convention we shall adopt for naming is that
 278          * a supplied address of zero means that "we don't care".
 279          * if there is a single interface, use the address of that
 280          * interface as our 6 byte host address.
 281          * if there are multiple interfaces, use any address already
 282          * used.
 283          *
 284          * Give the interface a chance to initialize
 285          * if this is its first address,
 286          * and to validate the address if necessary.
 287          */
 288         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 289                 ifnet_serialize_all(ifp);
 290                 if (ifp->if_ioctl &&
 291                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 292                                                 (caddr_t)ia,
 293                                                 NULL))) {
 294                         ia->ia_addr = oldaddr;
 295                         ifnet_deserialize_all(ifp);
 296                         crit_exit();
 297                         return (error);
 298                 }
 299                 ifnet_deserialize_all(ifp);
 300                 ns_thishost = *h;
 301         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 302             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 303                 *h = ns_thishost;
 304                 ifnet_serialize_all(ifp);
 305                 if (ifp->if_ioctl &&
 306                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 307                                                 (caddr_t)ia,
 308                                                 NULL))) {
 309                         ia->ia_addr = oldaddr;
 310                         ifnet_deserialize_all(ifp);
 311                         crit_exit();
 312                         return (error);
 313                 }
 314                 ifnet_deserialize_all(ifp);
 315                 if (!ns_hosteqnh(ns_thishost,*h)) {
 316                         ia->ia_addr = oldaddr;
 317                         crit_exit();
 318                         return (EINVAL);
 319                 }
 320         } else {
 321                 ia->ia_addr = oldaddr;
 322                 crit_exit();
 323                 return (EINVAL);
 324         }
 325         ia->ia_ifa.ifa_metric = ifp->if_metric;
 326         /*
 327          * Add route for the network.
 328          */
 329         if (scrub) {
 330                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 331                 ns_ifscrub(ifp, ia);
 332                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 333         }
 334         if (ifp->if_flags & IFF_POINTOPOINT)
 335                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 336         else {
 337                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 338                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 339         }
 340         ia->ia_flags |= IFA_ROUTE;
 341         return (0);
 342 }
 343
 344 /*
 345  * Return address info for specified internet network.
 346  */
 347 struct ns_ifaddr *
 348 ns_iaonnetof(struct ns_addr *dst)
 349 {
 350         struct ns_ifaddr *ia;
 351         struct ns_addr *compare;
 352         struct ifnet *ifp;
 353         struct ns_ifaddr *ia_maybe = 0;
 354         union ns_net net = dst->x_net;
 355
 356         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 357                 if ((ifp = ia->ia_ifp) != NULL) {
 358                         if (ifp->if_flags & IFF_POINTOPOINT) {
 359                                 compare = &satons_addr(ia->ia_dstaddr);
 360                                 if (ns_hosteq(*dst, *compare))
 361                                         return (ia);
 362                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 363                                         ia_maybe = ia;
 364                         } else {
 365                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 366                                         return (ia);
 367                         }
 368                 }
 369         }
 370         return (ia_maybe);
 371 }
 372 #endif