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 1.16 2008/01/06 16:55:52 swildner 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 ifaddr *ifa = NULL; /* XXX used ininitialized ?*/
  76         struct ns_ifaddr *oia;
  77         int dstIsNew, hostIsNew;
  78         int error = 0; /* initalize because of scoping */
  79
  80         /*
  81          * Find address for this interface, if it exists.
  82          */
  83         if (ifp == 0)
  84                 return (EADDRNOTAVAIL);
  85         for (ia = ns_ifaddr; ia; ia = ia->ia_next)
  86                 if (ia->ia_ifp == ifp)
  87                         break;
  88
  89         switch (cmd) {
  90
  91         case SIOCGIFADDR:
  92                 if (ia == (struct ns_ifaddr *)0)
  93                         return (EADDRNOTAVAIL);
  94                 *(struct sockaddr_ns *)&ifr->ifr_addr = ia->ia_addr;
  95                 return (0);
  96
  97
  98         case SIOCGIFBRDADDR:
  99                 if (ia == (struct ns_ifaddr *)0)
 100                         return (EADDRNOTAVAIL);
 101                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
 102                         return (EINVAL);
 103                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
 104                 return (0);
 105
 106         case SIOCGIFDSTADDR:
 107                 if (ia == (struct ns_ifaddr *)0)
 108                         return (EADDRNOTAVAIL);
 109                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 110                         return (EINVAL);
 111                 *(struct sockaddr_ns *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
 112                 return (0);
 113         }
 114
 115 #ifdef NS_PRIV_SOCKETS
 116         if ((so->so_state & SS_PRIV) == 0)
 117                 return (EPERM);
 118 #endif
 119
 120         switch (cmd) {
 121         case SIOCAIFADDR:
 122         case SIOCDIFADDR:
 123                 if (ifra->ifra_addr.sns_family == AF_NS)
 124                     for (oia = ia; ia; ia = ia->ia_next) {
 125                         if (ia->ia_ifp == ifp  &&
 126                             ns_neteq(ia->ia_addr.sns_addr,
 127                                   ifra->ifra_addr.sns_addr))
 128                             break;
 129                     }
 130                 if (cmd == SIOCDIFADDR && ia == 0)
 131                         return (EADDRNOTAVAIL);
 132                 /* FALLTHROUGH */
 133
 134         case SIOCSIFADDR:
 135         case SIOCSIFDSTADDR:
 136                 if (ia == (struct ns_ifaddr *)0) {
 137                         oia = (struct ns_ifaddr *)
 138                                 kmalloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
 139                         if ((ia = ns_ifaddr) != NULL) {
 140                                 for ( ; ia->ia_next; ia = ia->ia_next)
 141                                         ;
 142                                 ia->ia_next = oia;
 143                         } else
 144                                 ns_ifaddr = oia;
 145                         ia = oia;
 146
 147                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 148                         ia->ia_ifp = ifp;
 149                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 150
 151                         ia->ia_ifa.ifa_netmask =
 152                                 (struct sockaddr *)&ns_netmask;
 153
 154                         ia->ia_ifa.ifa_dstaddr =
 155                                 (struct sockaddr *)&ia->ia_dstaddr;
 156                         if (ifp->if_flags & IFF_BROADCAST) {
 157                                 ia->ia_broadaddr.sns_family = AF_NS;
 158                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 159                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 160                         }
 161                         ns_interfaces++;
 162                 }
 163         }
 164
 165         switch (cmd) {
 166         case SIOCSIFDSTADDR:
 167                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 168                         return (EINVAL);
 169                 if (ia->ia_flags & IFA_ROUTE) {
 170                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 171                         ia->ia_flags &= ~IFA_ROUTE;
 172                 }
 173                 if (ifp->if_ioctl) {
 174                         lwkt_serialize_enter(ifp->if_serializer);
 175                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR,
 176                                                         (caddr_t)ia,
 177                                                         (struct ucred *)NULL);
 178                         lwkt_serialize_exit(ifp->if_serializer);
 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                                 kprintf("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                 lwkt_serialize_enter(ifp->if_serializer);
 241                 error = ifp->if_ioctl(ifp, cmd, data, (struct ucred *)NULL);
 242                 lwkt_serialize_exit(ifp->if_serializer);
 243                 return (error);
 244         }
 245 }
 246
 247 /*
 248 * Delete any previous route for an old address.
 249 */
 250 void
 251 ns_ifscrub(struct ifnet *ifp, struct ns_ifaddr *ia)
 252 {
 253         if (ia->ia_flags & IFA_ROUTE) {
 254                 if (ifp->if_flags & IFF_POINTOPOINT) {
 255                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 256                 } else
 257                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 258                 ia->ia_flags &= ~IFA_ROUTE;
 259         }
 260 }
 261 /*
 262  * Initialize an interface's internet address
 263  * and routing table entry.
 264  */
 265 int
 266 ns_ifinit(struct ifnet *ifp, struct ns_ifaddr *ia, struct sockaddr_ns *sns, int scrub)
 267 {
 268         struct sockaddr_ns oldaddr;
 269         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 270         int error;
 271
 272         crit_enter();
 273
 274         /*
 275          * Set up new addresses.
 276          */
 277         oldaddr = ia->ia_addr;
 278         ia->ia_addr = *sns;
 279         /*
 280          * The convention we shall adopt for naming is that
 281          * a supplied address of zero means that "we don't care".
 282          * if there is a single interface, use the address of that
 283          * interface as our 6 byte host address.
 284          * if there are multiple interfaces, use any address already
 285          * used.
 286          *
 287          * Give the interface a chance to initialize
 288          * if this is its first address,
 289          * and to validate the address if necessary.
 290          */
 291         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 292                 lwkt_serialize_enter(ifp->if_serializer);
 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                         lwkt_serialize_exit(ifp->if_serializer);
 299                         crit_exit();
 300                         return (error);
 301                 }
 302                 lwkt_serialize_exit(ifp->if_serializer);
 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                 lwkt_serialize_enter(ifp->if_serializer);
 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                         lwkt_serialize_exit(ifp->if_serializer);
 314                         crit_exit();
 315                         return (error);
 316                 }
 317                 lwkt_serialize_exit(ifp->if_serializer);
 318                 if (!ns_hosteqnh(ns_thishost,*h)) {
 319                         ia->ia_addr = oldaddr;
 320                         crit_exit();
 321                         return (EINVAL);
 322                 }
 323         } else {
 324                 ia->ia_addr = oldaddr;
 325                 crit_exit();
 326                 return (EINVAL);
 327         }
 328         ia->ia_ifa.ifa_metric = ifp->if_metric;
 329         /*
 330          * Add route for the network.
 331          */
 332         if (scrub) {
 333                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 334                 ns_ifscrub(ifp, ia);
 335                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 336         }
 337         if (ifp->if_flags & IFF_POINTOPOINT)
 338                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 339         else {
 340                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 341                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 342         }
 343         ia->ia_flags |= IFA_ROUTE;
 344         return (0);
 345 }
 346
 347 /*
 348  * Return address info for specified internet network.
 349  */
 350 struct ns_ifaddr *
 351 ns_iaonnetof(struct ns_addr *dst)
 352 {
 353         struct ns_ifaddr *ia;
 354         struct ns_addr *compare;
 355         struct ifnet *ifp;
 356         struct ns_ifaddr *ia_maybe = 0;
 357         union ns_net net = dst->x_net;
 358
 359         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 360                 if ((ifp = ia->ia_ifp) != NULL) {
 361                         if (ifp->if_flags & IFF_POINTOPOINT) {
 362                                 compare = &satons_addr(ia->ia_dstaddr);
 363                                 if (ns_hosteq(*dst, *compare))
 364                                         return (ia);
 365                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 366                                         ia_maybe = ia;
 367                         } else {
 368                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 369                                         return (ia);
 370                         }
 371                 }
 372         }
 373         return (ia_maybe);
 374 }
 375 #endif