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 1.11 2005/11/28 17:13:47 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 #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                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
 139                         if (oia == (struct ns_ifaddr *)NULL)
 140                                 return (ENOBUFS);
 141                         bzero((caddr_t)oia, sizeof(*oia));
 142                         if ((ia = ns_ifaddr) != NULL) {
 143                                 for ( ; ia->ia_next; ia = ia->ia_next)
 144                                         ;
 145                                 ia->ia_next = oia;
 146                         } else
 147                                 ns_ifaddr = oia;
 148                         ia = oia;
 149
 150                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
 151                         ia->ia_ifp = ifp;
 152                         ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 153
 154                         ia->ia_ifa.ifa_netmask =
 155                                 (struct sockaddr *)&ns_netmask;
 156
 157                         ia->ia_ifa.ifa_dstaddr =
 158                                 (struct sockaddr *)&ia->ia_dstaddr;
 159                         if (ifp->if_flags & IFF_BROADCAST) {
 160                                 ia->ia_broadaddr.sns_family = AF_NS;
 161                                 ia->ia_broadaddr.sns_len = sizeof(ia->ia_addr);
 162                                 ia->ia_broadaddr.sns_addr.x_host = ns_broadhost;
 163                         }
 164                         ns_interfaces++;
 165                 }
 166         }
 167
 168         switch (cmd) {
 169         case SIOCSIFDSTADDR:
 170                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
 171                         return (EINVAL);
 172                 if (ia->ia_flags & IFA_ROUTE) {
 173                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 174                         ia->ia_flags &= ~IFA_ROUTE;
 175                 }
 176                 if (ifp->if_ioctl) {
 177                         lwkt_serialize_enter(ifp->if_serializer);
 178                         error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR,
 179                                                         (caddr_t)ia,
 180                                                         (struct ucred *)NULL);
 181                         lwkt_serialize_exit(ifp->if_serializer);
 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_ifaddr *)ia,
 237                                                 &ifra->ifra_addr, 0);
 238                 return (error);
 239
 240         default:
 241                 if (ifp->if_ioctl == 0)
 242                         return (EOPNOTSUPP);
 243                 lwkt_serialize_enter(ifp->if_serializer);
 244                 error = ifp->if_ioctl(ifp, cmd, data, (struct ucred *)NULL);
 245                 lwkt_serialize_exit(ifp->if_serializer);
 246                 return (error);
 247         }
 248 }
 249
 250 /*
 251 * Delete any previous route for an old address.
 252 */
 253 void
 254 ns_ifscrub(ifp, ia)
 255         struct ifnet *ifp;
 256         struct ns_ifaddr *ia;
 257 {
 258         if (ia->ia_flags & IFA_ROUTE) {
 259                 if (ifp->if_flags & IFF_POINTOPOINT) {
 260                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
 261                 } else
 262                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
 263                 ia->ia_flags &= ~IFA_ROUTE;
 264         }
 265 }
 266 /*
 267  * Initialize an interface's internet address
 268  * and routing table entry.
 269  */
 270 int
 271 ns_ifinit(ifp, ia, sns, scrub)
 272         struct ifnet *ifp;
 273         struct ns_ifaddr *ia;
 274         struct sockaddr_ns *sns;
 275         int scrub;
 276 {
 277         struct sockaddr_ns oldaddr;
 278         union ns_host *h = &ia->ia_addr.sns_addr.x_host;
 279         int error;
 280
 281         crit_enter();
 282
 283         /*
 284          * Set up new addresses.
 285          */
 286         oldaddr = ia->ia_addr;
 287         ia->ia_addr = *sns;
 288         /*
 289          * The convention we shall adopt for naming is that
 290          * a supplied address of zero means that "we don't care".
 291          * if there is a single interface, use the address of that
 292          * interface as our 6 byte host address.
 293          * if there are multiple interfaces, use any address already
 294          * used.
 295          *
 296          * Give the interface a chance to initialize
 297          * if this is its first address,
 298          * and to validate the address if necessary.
 299          */
 300         if (ns_hosteqnh(ns_thishost, ns_zerohost)) {
 301                 lwkt_serialize_enter(ifp->if_serializer);
 302                 if (ifp->if_ioctl &&
 303                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 304                                                 (caddr_t)ia,
 305                                                 (struct ucred *)NULL))) {
 306                         ia->ia_addr = oldaddr;
 307                         lwkt_serialize_exit(ifp->if_serializer);
 308                         crit_exit();
 309                         return (error);
 310                 }
 311                 lwkt_serialize_exit(ifp->if_serializer);
 312                 ns_thishost = *h;
 313         } else if (ns_hosteqnh(sns->sns_addr.x_host, ns_zerohost)
 314             || ns_hosteqnh(sns->sns_addr.x_host, ns_thishost)) {
 315                 *h = ns_thishost;
 316                 lwkt_serialize_enter(ifp->if_serializer);
 317                 if (ifp->if_ioctl &&
 318                      (error = ifp->if_ioctl(ifp, SIOCSIFADDR,
 319                                                 (caddr_t)ia,
 320                                                 (struct ucred *)NULL))) {
 321                         ia->ia_addr = oldaddr;
 322                         lwkt_serialize_exit(ifp->if_serializer);
 323                         crit_exit();
 324                         return (error);
 325                 }
 326                 lwkt_serialize_exit(ifp->if_serializer);
 327                 if (!ns_hosteqnh(ns_thishost,*h)) {
 328                         ia->ia_addr = oldaddr;
 329                         crit_exit();
 330                         return (EINVAL);
 331                 }
 332         } else {
 333                 ia->ia_addr = oldaddr;
 334                 crit_exit();
 335                 return (EINVAL);
 336         }
 337         ia->ia_ifa.ifa_metric = ifp->if_metric;
 338         /*
 339          * Add route for the network.
 340          */
 341         if (scrub) {
 342                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
 343                 ns_ifscrub(ifp, ia);
 344                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
 345         }
 346         if (ifp->if_flags & IFF_POINTOPOINT)
 347                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
 348         else {
 349                 ia->ia_broadaddr.sns_addr.x_net = ia->ia_addr.sns_addr.x_net;
 350                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
 351         }
 352         ia->ia_flags |= IFA_ROUTE;
 353         return (0);
 354 }
 355
 356 /*
 357  * Return address info for specified internet network.
 358  */
 359 struct ns_ifaddr *
 360 ns_iaonnetof(dst)
 361         struct ns_addr *dst;
 362 {
 363         struct ns_ifaddr *ia;
 364         struct ns_addr *compare;
 365         struct ifnet *ifp;
 366         struct ns_ifaddr *ia_maybe = 0;
 367         union ns_net net = dst->x_net;
 368
 369         for (ia = ns_ifaddr; ia; ia = ia->ia_next) {
 370                 if ((ifp = ia->ia_ifp) != NULL) {
 371                         if (ifp->if_flags & IFF_POINTOPOINT) {
 372                                 compare = &satons_addr(ia->ia_dstaddr);
 373                                 if (ns_hosteq(*dst, *compare))
 374                                         return (ia);
 375                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 376                                         ia_maybe = ia;
 377                         } else {
 378                                 if (ns_neteqnn(net, ia->ia_addr.sns_addr.x_net))
 379                                         return (ia);
 380                         }
 381                 }
 382         }
 383         return (ia_maybe);
 384 }
 385 #endif