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 == (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 = 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                         lwkt_serialize_enter(ifp->if_serializer);
 173                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR,
 174                                                         (caddr_t)ia,
 175                                                         (struct ucred *)NULL);
 176                         lwkt_serialize_exit(ifp->if_serializer);
 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, (struct ns_ifaddr *)ia,
 185                                 (struct sockaddr_ns *)&ifr->ifr_addr, 1));
 186
 187         case SIOCDIFADDR:
 188                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 189                 /* XXX not on list */
 190                 oia = ia;
 191                 ifa_ifunlink(&ia->ia_ifa, ifp);
 192                 if (oia == (ia = ns_ifaddr)) {
 193                         ns_ifaddr = ia->ia_next;
 194                 } else {
 195                         while (ia->ia_next && (ia->ia_next != oia)) {
 196                                 ia = ia->ia_next;
 197                         }
 198                         if (ia->ia_next)
 199                             ia->ia_next = oia->ia_next;
 200                         else
 201                                 kprintf("Didn't unlink nsifadr from list\n");
 202                 }
 203                 ifa_destroy(&oia->ia_ifa);
 204                 if (0 == --ns_interfaces) {
 205                         /*
 206                          * We reset to virginity and start all over again
 207                          */
 208                         ns_thishost = ns_zerohost;
 209                 }
 210                 return (0);
 211
 212         case SIOCAIFADDR:
 213                 dstIsNew = 0; hostIsNew = 1;
 214                 if (ia->ia_addr.sns_family == AF_NS) {
 215                         if (ifra->ifra_addr.sns_len == 0) {
 216                                 ifra->ifra_addr = ia->ia_addr;
 217                                 hostIsNew = 0;
 218                         } else if (ns_neteq(ifra->ifra_addr.sns_addr,
 219                                          ia->ia_addr.sns_addr))
 220                                 hostIsNew = 0;
 221                 }
 222                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
 223                     (ifra->ifra_dstaddr.sns_family == AF_NS)) {
 224                         if (hostIsNew == 0)
 225                                 ns_ifscrub(ifp, (struct ns_ifaddr *)ia);
 226                         ia->ia_dstaddr = ifra->ifra_dstaddr;
 227                         dstIsNew  = 1;
 228                 }
 229                 if (ifra->ifra_addr.sns_family == AF_NS &&
 230                                             (hostIsNew || dstIsNew))
 231                         error = ns_ifinit(ifp, (struct ns_ifaddr *)ia,
 232                                                 &ifra->ifra_addr, 0);
 233                 return (error);
 234
 235         default:
 236                 if (ifp->if_ioctl == 0)
 237                         return (EOPNOTSUPP);
 238                 lwkt_serialize_enter(ifp->if_serializer);
 239                 error = ifp->if_ioctl(ifp, cmd, data, (struct ucred *)NULL);
 240                 lwkt_serialize_exit(ifp->if_serializer);
 241                 return (error);
 242         }
 243 }
 244
 245 /*
 246 * Delete any previous route for an old address.
 247 */
 248 void
 249 ns_ifscrub(struct ifnet *ifp, struct ns_ifaddr *ia)
 250 {
 251         if (ia->ia_flags & IFA_ROUTE) {
 252                 if (ifp->if_flags & IFF_POINTOPOINT) {
 253                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 254                 } else
 255                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 256                 ia->ia_flags &= ~IFA_ROUTE;
 257         }
 258 }
 259 /*
 260  * Initialize an interface's internet address
 261  * and routing table entry.
 262  */
 263 int
 264 ns_ifinit(struct ifnet *ifp, struct ns_ifaddr *ia, struct sockaddr_ns *sns, int scrub)
 265 {
 266         struct sockaddr_ns oldaddr;
 267         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 268         int error;
 269
 270         crit_enter();
 271
 272         /*
 273          * Set up new addresses.
 274          */
 275         oldaddr = ia->ia_addr;
 276         ia->ia_addr = *sns;
 277         /*
 278          * The convention we shall adopt for naming is that
 279          * a supplied address of zero means that "we don't care".
 280          * if there is a single interface, use the address of that
 281          * interface as our 6 byte host address.
 282          * if there are multiple interfaces, use any address already
 283          * used.
 284          *
 285          * Give the interface a chance to initialize
 286          * if this is its first address,
 287          * and to validate the address if necessary.
 288          */
 289         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 290                 lwkt_serialize_enter(ifp->if_serializer);
 291                 if (ifp->if_ioctl &&
 292                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 293                                                 (caddr_t)ia,
 294                                                 (struct ucred *)NULL))) {
 295                         ia->ia_addr = oldaddr;
 296                         lwkt_serialize_exit(ifp->if_serializer);
 297                         crit_exit();
 298                         return (error);
 299                 }
 300                 lwkt_serialize_exit(ifp->if_serializer);
 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                 lwkt_serialize_enter(ifp->if_serializer);
 306                 if (ifp->if_ioctl &&
 307                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 308                                                 (caddr_t)ia,
 309                                                 (struct ucred *)NULL))) {
 310                         ia->ia_addr = oldaddr;
 311                         lwkt_serialize_exit(ifp->if_serializer);
 312                         crit_exit();
 313                         return (error);
 314                 }
 315                 lwkt_serialize_exit(ifp->if_serializer);
 316                 if (!ns_hosteqnh(ns_thishost,*h)) {
 317                         ia->ia_addr = oldaddr;
 318                         crit_exit();
 319                         return (EINVAL);
 320                 }
 321         } else {
 322                 ia->ia_addr = oldaddr;
 323                 crit_exit();
 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(struct ns_addr *dst)
 350 {
 351         struct ns_ifaddr *ia;
 352         struct ns_addr *compare;
 353         struct ifnet *ifp;
 354         struct ns_ifaddr *ia_maybe = 0;
 355         union ns_net net = dst->x_net;
 356
 357         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 358                 if ((ifp = ia->ia_ifp) != NULL) {
 359                         if (ifp->if_flags & IFF_POINTOPOINT) {
 360                                 compare = &satons_addr(ia->ia_dstaddr);
 361                                 if (ns_hosteq(*dst, *compare))
 362                                         return (ia);
 363                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 364                                         ia_maybe = ia;
 365                         } else {
 366                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 367                                         return (ia);
 368                         }
 369                 }
 370         }
 371         return (ia_maybe);
 372 }
 373 #endif