release/src/router/dhcpv6/addrconf.c

   1 /*      $KAME: addrconf.c,v 1.8 2005/09/16 11:30:13 suz Exp $   */
   2
   3 /*
   4  * Copyright (C) 2002 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33 #include <sys/socket.h>
  34 #include <sys/queue.h>
  35 #include <sys/ioctl.h>
  36
  37 #include <net/if.h>
  38 #ifdef __FreeBSD__
  39 #include <net/if_var.h>
  40 #endif
  41
  42 #include <netinet/in.h>
  43
  44 #ifdef __KAME__
  45 #include <netinet6/in6_var.h>
  46 #include <netinet6/nd6.h>
  47 #endif
  48
  49 #include <errno.h>
  50 #include <syslog.h>
  51 #include <string.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <unistd.h>
  55
  56 #include "dhcp6.h"
  57 #include "config.h"
  58 #include "common.h"
  59 #include "timer.h"
  60 #include "dhcp6c_ia.h"
  61 #include "prefixconf.h"
  62
  63 TAILQ_HEAD(statefuladdr_list, statefuladdr);
  64 struct iactl_na {
  65         struct iactl common;
  66         struct statefuladdr_list statefuladdr_head;
  67 };
  68 #define iacna_ia common.iactl_ia
  69 #define iacna_callback common.callback
  70 #define iacna_isvalid common.isvalid
  71 #define iacna_duration common.duration
  72 #define iacna_renew_data common.renew_data
  73 #define iacna_rebind_data common.rebind_data
  74 #define iacna_reestablish_data common.reestablish_data
  75 #define iacna_release_data common.release_data
  76 #define iacna_cleanup common.cleanup
  77
  78 struct statefuladdr {
  79         TAILQ_ENTRY (statefuladdr) link;
  80
  81         struct dhcp6_statefuladdr addr;
  82         time_t updatetime;
  83         struct dhcp6_timer *timer;
  84         struct iactl_na *ctl;
  85         struct dhcp6_if *dhcpif;
  86 };
  87
  88 static struct statefuladdr *find_addr __P((struct statefuladdr_list *,
  89     struct dhcp6_statefuladdr *));
  90 static int remove_addr __P((struct statefuladdr *));
  91 static int isvalid_addr __P((struct iactl *));
  92 static u_int32_t duration_addr __P((struct iactl *));
  93 static void cleanup_addr __P((struct iactl *));
  94 static int renew_addr __P((struct iactl *, struct dhcp6_ia *,
  95     struct dhcp6_eventdata **, struct dhcp6_eventdata *));
  96 static void na_renew_data_free __P((struct dhcp6_eventdata *));
  97
  98 static struct dhcp6_timer *addr_timo __P((void *));
  99
 100 static int na_ifaddrconf __P((ifaddrconf_cmd_t, struct statefuladdr *));
 101
 102 extern struct dhcp6_timer *client6_timo __P((void *));
 103
 104 int
 105 update_address(ia, addr, dhcpifp, ctlp, callback)
 106         struct ia *ia;
 107         struct dhcp6_statefuladdr *addr;
 108         struct dhcp6_if *dhcpifp;
 109         struct iactl **ctlp;
 110         void (*callback)__P((struct ia *));
 111 {
 112         struct iactl_na *iac_na = (struct iactl_na *)*ctlp;
 113         struct statefuladdr *sa;
 114         int sacreate = 0;
 115         struct timeval timo;
 116
 117         /*
 118          * A client discards any addresses for which the preferred
 119          * lifetime is greater than the valid lifetime.
 120          * [RFC3315 22.6]
 121          */
 122         if (addr->vltime != DHCP6_DURATION_INFINITE &&
 123             (addr->pltime == DHCP6_DURATION_INFINITE ||
 124             addr->pltime > addr->vltime)) {
 125                 dprintf(LOG_INFO, FNAME, "invalid address %s: "
 126                     "pltime (%lu) is larger than vltime (%lu)",
 127                     in6addr2str(&addr->addr, 0),
 128                     addr->pltime, addr->vltime);
 129                 return (-1);
 130         }
 131
 132         if (iac_na == NULL) {
 133                 if ((iac_na = malloc(sizeof(*iac_na))) == NULL) {
 134                         dprintf(LOG_NOTICE, FNAME, "memory allocation failed");
 135                         return (-1);
 136                 }
 137                 memset(iac_na, 0, sizeof(*iac_na));
 138                 iac_na->iacna_ia = ia;
 139                 iac_na->iacna_callback = callback;
 140                 iac_na->iacna_isvalid = isvalid_addr;
 141                 iac_na->iacna_duration = duration_addr;
 142                 iac_na->iacna_cleanup = cleanup_addr;
 143                 iac_na->iacna_renew_data =
 144                     iac_na->iacna_rebind_data =
 145                     iac_na->iacna_release_data =
 146                     iac_na->iacna_reestablish_data = renew_addr;
 147
 148                 TAILQ_INIT(&iac_na->statefuladdr_head);
 149                 *ctlp = (struct iactl *)iac_na;
 150         }
 151
 152         /* search for the given address, and make a new one if it fails */
 153         if ((sa = find_addr(&iac_na->statefuladdr_head, addr)) == NULL) {
 154                 if ((sa = malloc(sizeof(*sa))) == NULL) {
 155                         dprintf(LOG_NOTICE, FNAME, "memory allocation failed");
 156                         return (-1);
 157                 }
 158                 memset(sa, 0, sizeof(*sa));
 159                 sa->addr.addr = addr->addr;
 160                 sa->ctl = iac_na;
 161                 TAILQ_INSERT_TAIL(&iac_na->statefuladdr_head, sa, link);
 162                 sacreate = 1;
 163         }
 164
 165         /* update the timestamp of update */
 166         sa->updatetime = time(NULL);
 167
 168         /* update the prefix according to addr */
 169         sa->addr.pltime = addr->pltime;
 170         sa->addr.vltime = addr->vltime;
 171         sa->dhcpif = dhcpifp;
 172         dprintf(LOG_DEBUG, FNAME, "%s an address %s pltime=%lu, vltime=%lu",
 173             sacreate ? "create" : "update",
 174             in6addr2str(&addr->addr, 0), addr->pltime, addr->vltime);
 175
 176         if (sa->addr.vltime != 0)
 177                 if (na_ifaddrconf(IFADDRCONF_ADD, sa) < 0)
 178                         return (-1);
 179
 180         /*
 181          * If the new vltime is 0, this address immediately expires.
 182          * Otherwise, set up or update the associated timer.
 183          */
 184         switch (sa->addr.vltime) {
 185         case 0:
 186                 if (remove_addr(sa) < 0)
 187                         return (-1);
 188                 break;
 189         case DHCP6_DURATION_INFINITE:
 190                 if (sa->timer)
 191                         dhcp6_remove_timer(&sa->timer);
 192                 break;
 193         default:
 194                 if (sa->timer == NULL) {
 195                         sa->timer = dhcp6_add_timer(addr_timo, sa);
 196                         if (sa->timer == NULL) {
 197                                 dprintf(LOG_NOTICE, FNAME,
 198                                     "failed to add stateful addr timer");
 199                                 remove_addr(sa); /* XXX */
 200                                 return (-1);
 201                         }
 202                 }
 203                 /* update the timer */
 204                 timo.tv_sec = sa->addr.vltime;
 205                 timo.tv_usec = 0;
 206
 207                 dhcp6_set_timer(&timo, sa->timer);
 208                 break;
 209         }
 210
 211         return (0);
 212 }
 213
 214 static struct statefuladdr *
 215 find_addr(head, addr)
 216         struct statefuladdr_list *head;
 217         struct dhcp6_statefuladdr *addr;
 218 {
 219         struct statefuladdr *sa;
 220
 221         for (sa = TAILQ_FIRST(head); sa; sa = TAILQ_NEXT(sa, link)) {
 222                 if (!IN6_ARE_ADDR_EQUAL(&sa->addr.addr, &addr->addr))
 223                         continue;
 224                 return (sa);
 225         }
 226
 227         return (NULL);
 228 }
 229
 230 static int
 231 remove_addr(sa)
 232         struct statefuladdr *sa;
 233 {
 234         int ret;
 235
 236         dprintf(LOG_DEBUG, FNAME, "remove an address %s",
 237             in6addr2str(&sa->addr.addr, 0));
 238
 239         if (sa->timer)
 240                 dhcp6_remove_timer(&sa->timer);
 241
 242         TAILQ_REMOVE(&sa->ctl->statefuladdr_head, sa, link);
 243         ret = na_ifaddrconf(IFADDRCONF_REMOVE, sa);
 244         free(sa);
 245
 246         return (ret);
 247 }
 248
 249 static int
 250 isvalid_addr(iac)
 251         struct iactl *iac;
 252 {
 253         struct iactl_na *iac_na = (struct iactl_na *)iac;
 254
 255         if (TAILQ_EMPTY(&iac_na->statefuladdr_head))
 256                 return (0);     /* this IA is invalid */
 257         return (1);
 258 }
 259
 260 static u_int32_t
 261 duration_addr(iac)
 262         struct iactl *iac;
 263 {
 264         struct iactl_na *iac_na = (struct iactl_na *)iac;
 265         struct statefuladdr *sa;
 266         u_int32_t base = DHCP6_DURATION_INFINITE, pltime, passed;
 267         time_t now;
 268
 269         /* Determine the smallest period until pltime expires. */
 270         now = time(NULL);
 271         for (sa = TAILQ_FIRST(&iac_na->statefuladdr_head); sa;
 272             sa = TAILQ_NEXT(sa, link)) {
 273                 passed = now > sa->updatetime ?
 274                     (u_int32_t)(now - sa->updatetime) : 0;
 275                 pltime = sa->addr.pltime > passed ?
 276                     sa->addr.pltime - passed : 0;
 277
 278                 if (base == DHCP6_DURATION_INFINITE || pltime < base)
 279                         base = pltime;
 280         }
 281
 282         return (base);
 283 }
 284
 285 static void
 286 cleanup_addr(iac)
 287         struct iactl *iac;
 288 {
 289         struct iactl_na *iac_na = (struct iactl_na *)iac;
 290         struct statefuladdr *sa;
 291
 292         while ((sa = TAILQ_FIRST(&iac_na->statefuladdr_head)) != NULL) {
 293                 TAILQ_REMOVE(&iac_na->statefuladdr_head, sa, link);
 294                 remove_addr(sa);
 295         }
 296
 297         free(iac);
 298 }
 299
 300 static int
 301 renew_addr(iac, iaparam, evdp, evd)
 302         struct iactl *iac;
 303         struct dhcp6_ia *iaparam;
 304         struct dhcp6_eventdata **evdp, *evd;
 305 {
 306         struct iactl_na *iac_na = (struct iactl_na *)iac;
 307         struct statefuladdr *sa;
 308         struct dhcp6_list *ial = NULL, pl;
 309
 310         TAILQ_INIT(&pl);
 311         for (sa = TAILQ_FIRST(&iac_na->statefuladdr_head); sa;
 312             sa = TAILQ_NEXT(sa, link)) {
 313                 if (dhcp6_add_listval(&pl, DHCP6_LISTVAL_STATEFULADDR6,
 314                     &sa->addr, NULL) == NULL)
 315                         goto fail;
 316         }
 317
 318         if ((ial = malloc(sizeof(*ial))) == NULL)
 319                 goto fail;
 320         TAILQ_INIT(ial);
 321         if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IANA, iaparam, &pl) == NULL)
 322                 goto fail;
 323         dhcp6_clear_list(&pl);
 324
 325         evd->type = DHCP6_EVDATA_IANA;
 326         evd->data = (void *)ial;
 327         evd->privdata = (void *)evdp;
 328         evd->destructor = na_renew_data_free;
 329
 330         return (0);
 331
 332   fail:
 333         dhcp6_clear_list(&pl);
 334         if (ial)
 335                 free(ial);
 336         return (-1);
 337 }
 338
 339 static void
 340 na_renew_data_free(evd)
 341         struct dhcp6_eventdata *evd;
 342 {
 343         struct dhcp6_list *ial;
 344
 345         if (evd->type != DHCP6_EVDATA_IANA) {
 346                 dprintf(LOG_ERR, FNAME, "assumption failure");
 347                 exit(1);
 348         }
 349
 350         if (evd->privdata)
 351                 *(struct dhcp6_eventdata **)evd->privdata = NULL;
 352         ial = (struct dhcp6_list *)evd->data;
 353         dhcp6_clear_list(ial);
 354         free(ial);
 355 }
 356
 357 static struct dhcp6_timer *
 358 addr_timo(arg)
 359         void *arg;
 360 {
 361         struct statefuladdr *sa = (struct statefuladdr *)arg;
 362         struct ia *ia;
 363         void (*callback)__P((struct ia *));
 364
 365         dprintf(LOG_DEBUG, FNAME, "address timeout for %s",
 366             in6addr2str(&sa->addr.addr, 0));
 367
 368         ia = sa->ctl->iacna_ia;
 369         callback = sa->ctl->iacna_callback;
 370
 371         if (sa->timer)
 372                 dhcp6_remove_timer(&sa->timer);
 373
 374         remove_addr(sa);
 375
 376         (*callback)(ia);
 377
 378         return (NULL);
 379 }
 380
 381 static int
 382 na_ifaddrconf(cmd, sa)
 383         ifaddrconf_cmd_t cmd;
 384         struct statefuladdr *sa;
 385 {
 386         struct dhcp6_statefuladdr *addr;
 387         struct sockaddr_in6 sin6;
 388
 389         addr = &sa->addr;
 390         memset(&sin6, 0, sizeof(sin6));
 391         sin6.sin6_family = AF_INET6;
 392 #ifdef HAVE_SA_LEN
 393         sin6.sin6_len = sizeof(sin6);
 394 #endif
 395         sin6.sin6_addr = addr->addr;
 396
 397         return (ifaddrconf(cmd, sa->dhcpif->ifname, &sin6, 128,
 398             addr->pltime, addr->vltime));
 399 }