src/dhcpv6.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2012  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25 #include <stdio.h>
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include <connman/ipconfig.h>
  31 #include <connman/storage.h>
  32
  33 #include <gdhcp/gdhcp.h>
  34
  35 #include <glib.h>
  36
  37 #include "connman.h"
  38
  39 /* Transmission params in msec, RFC 3315 chapter 5.5 */
  40 #define INF_MAX_DELAY   (1 * 1000)
  41 #define INF_TIMEOUT     (1 * 1000)
  42 #define INF_MAX_RT      (120 * 1000)
  43 #define SOL_MAX_DELAY   (1 * 1000)
  44 #define SOL_TIMEOUT     (1 * 1000)
  45 #define SOL_MAX_RT      (120 * 1000)
  46 #define REQ_TIMEOUT     (1 * 1000)
  47 #define REQ_MAX_RT      (30 * 1000)
  48 #define REQ_MAX_RC      10
  49 #define REN_TIMEOUT     (10 * 1000)
  50 #define REN_MAX_RT      (600 * 1000)
  51 #define REB_TIMEOUT     (10 * 1000)
  52 #define REB_MAX_RT      (600 * 1000)
  53
  54
  55 struct connman_dhcpv6 {
  56         struct connman_network *network;
  57         dhcp_cb callback;
  58
  59         char **nameservers;
  60         char **timeservers;
  61
  62         GDHCPClient *dhcp_client;
  63
  64         guint timeout;          /* operation timeout in msec */
  65         guint RT;               /* in msec */
  66         gboolean use_ta;        /* set to TRUE if IPv6 privacy is enabled */
  67         GSList *prefixes;       /* network prefixes from radvd */
  68         int request_count;      /* how many times REQUEST have been sent */
  69         gboolean stateless;     /* TRUE if stateless DHCPv6 is used */
  70         gboolean started;       /* TRUE if we have DHCPv6 started */
  71 };
  72
  73 static GHashTable *network_table;
  74
  75 static int dhcpv6_request(struct connman_dhcpv6 *dhcp, gboolean add_addresses);
  76
  77 static void clear_timer(struct connman_dhcpv6 *dhcp)
  78 {
  79         if (dhcp->timeout > 0) {
  80                 g_source_remove(dhcp->timeout);
  81                 dhcp->timeout = 0;
  82         }
  83 }
  84
  85 static inline float get_random()
  86 {
  87         return (rand() % 200 - 100) / 1000.0;
  88 }
  89
  90 /* Calculate a random delay, RFC 3315 chapter 14 */
  91 /* RT and MRT are milliseconds */
  92 static guint calc_delay(guint RT, guint MRT)
  93 {
  94         float delay = get_random();
  95         float rt = RT * (2 + delay);
  96
  97         if (rt > MRT)
  98                 rt = MRT * (1 + delay);
  99
 100         if (rt < 0)
 101                 rt = MRT;
 102
 103         return (guint)rt;
 104 }
 105
 106 static void free_prefix(gpointer data, gpointer user_data)
 107 {
 108         g_free(data);
 109 }
 110
 111 static void dhcpv6_free(struct connman_dhcpv6 *dhcp)
 112 {
 113         g_strfreev(dhcp->nameservers);
 114         g_strfreev(dhcp->timeservers);
 115
 116         dhcp->nameservers = NULL;
 117         dhcp->timeservers = NULL;
 118         dhcp->started = FALSE;
 119
 120         g_slist_foreach(dhcp->prefixes, free_prefix, NULL);
 121         g_slist_free(dhcp->prefixes);
 122 }
 123
 124 static gboolean compare_string_arrays(char **array_a, char **array_b)
 125 {
 126         int i;
 127
 128         if (array_a == NULL || array_b == NULL)
 129                 return FALSE;
 130
 131         if (g_strv_length(array_a) != g_strv_length(array_b))
 132                 return FALSE;
 133
 134         for (i = 0; array_a[i] != NULL && array_b[i] != NULL; i++)
 135                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 136                         return FALSE;
 137
 138         return TRUE;
 139 }
 140
 141 static void dhcpv6_debug(const char *str, void *data)
 142 {
 143         connman_info("%s: %s\n", (const char *) data, str);
 144 }
 145
 146 static gchar *convert_to_hex(unsigned char *buf, int len)
 147 {
 148         gchar *ret = g_try_malloc(len * 2 + 1);
 149         int i;
 150
 151         for (i = 0; ret != NULL && i < len; i++)
 152                 g_snprintf(ret + i * 2, 3, "%02x", buf[i]);
 153
 154         return ret;
 155 }
 156
 157 /*
 158  * DUID should not change over time so save it to file.
 159  * See RFC 3315 chapter 9 for details.
 160  */
 161 static int set_duid(struct connman_service *service,
 162                         struct connman_network *network,
 163                         GDHCPClient *dhcp_client, int index)
 164 {
 165         GKeyFile *keyfile;
 166         const char *ident;
 167         char *hex_duid;
 168         unsigned char *duid;
 169         int duid_len;
 170
 171         ident = __connman_service_get_ident(service);
 172
 173         keyfile = connman_storage_load_service(ident);
 174         if (keyfile == NULL)
 175                 return -EINVAL;
 176
 177         hex_duid = g_key_file_get_string(keyfile, ident, "IPv6.DHCP.DUID",
 178                                         NULL);
 179         if (hex_duid != NULL) {
 180                 unsigned int i, j = 0, hex;
 181                 size_t hex_duid_len = strlen(hex_duid);
 182
 183                 duid = g_try_malloc0(hex_duid_len / 2);
 184                 if (duid == NULL) {
 185                         g_key_file_free(keyfile);
 186                         g_free(hex_duid);
 187                         return -ENOMEM;
 188                 }
 189
 190                 for (i = 0; i < hex_duid_len; i += 2) {
 191                         sscanf(hex_duid + i, "%02x", &hex);
 192                         duid[j++] = hex;
 193                 }
 194
 195                 duid_len = hex_duid_len / 2;
 196         } else {
 197                 int ret;
 198                 int type = __connman_ipconfig_get_type_from_index(index);
 199
 200                 ret = g_dhcpv6_create_duid(G_DHCPV6_DUID_LLT, index, type,
 201                                         &duid, &duid_len);
 202                 if (ret < 0) {
 203                         g_key_file_free(keyfile);
 204                         return ret;
 205                 }
 206
 207                 hex_duid = convert_to_hex(duid, duid_len);
 208                 if (hex_duid == NULL) {
 209                         g_key_file_free(keyfile);
 210                         return -ENOMEM;
 211                 }
 212
 213                 g_key_file_set_string(keyfile, ident, "IPv6.DHCP.DUID",
 214                                 hex_duid);
 215
 216                 __connman_storage_save_service(keyfile, ident);
 217         }
 218         g_free(hex_duid);
 219
 220         g_key_file_free(keyfile);
 221
 222         g_dhcpv6_client_set_duid(dhcp_client, duid, duid_len);
 223
 224         return 0;
 225 }
 226
 227 static void clear_callbacks(GDHCPClient *dhcp_client)
 228 {
 229         g_dhcp_client_register_event(dhcp_client,
 230                                 G_DHCP_CLIENT_EVENT_SOLICITATION,
 231                                 NULL, NULL);
 232
 233         g_dhcp_client_register_event(dhcp_client,
 234                                 G_DHCP_CLIENT_EVENT_ADVERTISE,
 235                                 NULL, NULL);
 236
 237         g_dhcp_client_register_event(dhcp_client,
 238                                 G_DHCP_CLIENT_EVENT_REQUEST,
 239                                 NULL, NULL);
 240
 241         g_dhcp_client_register_event(dhcp_client,
 242                                 G_DHCP_CLIENT_EVENT_RENEW,
 243                                 NULL, NULL);
 244
 245         g_dhcp_client_register_event(dhcp_client,
 246                                 G_DHCP_CLIENT_EVENT_REBIND,
 247                                 NULL, NULL);
 248
 249         g_dhcp_client_register_event(dhcp_client,
 250                                 G_DHCP_CLIENT_EVENT_RELEASE,
 251                                 NULL, NULL);
 252
 253         g_dhcp_client_register_event(dhcp_client,
 254                                 G_DHCP_CLIENT_EVENT_INFORMATION_REQ,
 255                                 NULL, NULL);
 256 }
 257
 258 static void info_req_cb(GDHCPClient *dhcp_client, gpointer user_data)
 259 {
 260         struct connman_dhcpv6 *dhcp = user_data;
 261         struct connman_service *service;
 262         int entries, i;
 263         GList *option, *list;
 264         char **nameservers, **timeservers;
 265
 266         DBG("dhcpv6 information-request %p", dhcp);
 267
 268         service = __connman_service_lookup_from_network(dhcp->network);
 269         if (service == NULL) {
 270                 connman_error("Can not lookup service");
 271                 return;
 272         }
 273
 274         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_DNS_SERVERS);
 275         entries = g_list_length(option);
 276
 277         nameservers = g_try_new0(char *, entries + 1);
 278         if (nameservers != NULL) {
 279                 for (i = 0, list = option; list; list = list->next, i++)
 280                         nameservers[i] = g_strdup(list->data);
 281         }
 282
 283         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 284                 if (dhcp->nameservers != NULL) {
 285                         for (i = 0; dhcp->nameservers[i] != NULL; i++)
 286                                 __connman_service_nameserver_remove(service,
 287                                                         dhcp->nameservers[i],
 288                                                         FALSE);
 289                         g_strfreev(dhcp->nameservers);
 290                 }
 291
 292                 dhcp->nameservers = nameservers;
 293
 294                 for (i = 0; dhcp->nameservers[i] != NULL; i++)
 295                         __connman_service_nameserver_append(service,
 296                                                 dhcp->nameservers[i],
 297                                                 FALSE);
 298         } else
 299                 g_strfreev(nameservers);
 300
 301
 302         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 303         entries = g_list_length(option);
 304
 305         timeservers = g_try_new0(char *, entries + 1);
 306         if (timeservers != NULL) {
 307                 for (i = 0, list = option; list; list = list->next, i++)
 308                         timeservers[i] = g_strdup(list->data);
 309         }
 310
 311         if (compare_string_arrays(timeservers, dhcp->timeservers) == FALSE) {
 312                 if (dhcp->timeservers != NULL) {
 313                         for (i = 0; dhcp->timeservers[i] != NULL; i++)
 314                                 __connman_service_timeserver_remove(service,
 315                                                         dhcp->timeservers[i]);
 316                         g_strfreev(dhcp->timeservers);
 317                 }
 318
 319                 dhcp->timeservers = timeservers;
 320
 321                 for (i = 0; dhcp->timeservers[i] != NULL; i++)
 322                         __connman_service_timeserver_append(service,
 323                                                         dhcp->timeservers[i]);
 324         } else
 325                 g_strfreev(timeservers);
 326
 327
 328         if (dhcp->callback != NULL) {
 329                 uint16_t status = g_dhcpv6_client_get_status(dhcp_client);
 330                 dhcp->callback(dhcp->network, status == 0 ? TRUE : FALSE);
 331         }
 332 }
 333
 334 static int dhcpv6_info_request(struct connman_dhcpv6 *dhcp)
 335 {
 336         struct connman_service *service;
 337         GDHCPClient *dhcp_client;
 338         GDHCPClientError error;
 339         int index, ret;
 340
 341         DBG("dhcp %p", dhcp);
 342
 343         index = connman_network_get_index(dhcp->network);
 344
 345         dhcp_client = g_dhcp_client_new(G_DHCP_IPV6, index, &error);
 346         if (error != G_DHCP_CLIENT_ERROR_NONE) {
 347                 clear_timer(dhcp);
 348                 return -EINVAL;
 349         }
 350
 351         if (getenv("CONNMAN_DHCPV6_DEBUG"))
 352                 g_dhcp_client_set_debug(dhcp_client, dhcpv6_debug, "DHCPv6");
 353
 354         service = __connman_service_lookup_from_network(dhcp->network);
 355         if (service == NULL) {
 356                 clear_timer(dhcp);
 357                 g_dhcp_client_unref(dhcp_client);
 358                 return -EINVAL;
 359         }
 360
 361         ret = set_duid(service, dhcp->network, dhcp_client, index);
 362         if (ret < 0) {
 363                 clear_timer(dhcp);
 364                 g_dhcp_client_unref(dhcp_client);
 365                 return ret;
 366         }
 367
 368         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 369         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 370         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 371
 372         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 373                                 G_DHCPV6_SNTP_SERVERS);
 374
 375         g_dhcp_client_register_event(dhcp_client,
 376                         G_DHCP_CLIENT_EVENT_INFORMATION_REQ, info_req_cb, dhcp);
 377
 378         dhcp->dhcp_client = dhcp_client;
 379
 380         return g_dhcp_client_start(dhcp_client, NULL);
 381 }
 382
 383 static int check_ipv6_addr_prefix(GSList *prefixes, char *address)
 384 {
 385         struct in6_addr addr_prefix, addr;
 386         GSList *list;
 387         int ret = 128, len;
 388
 389         for (list = prefixes; list; list = list->next) {
 390                 char *prefix = list->data;
 391                 const char *slash = g_strrstr(prefix, "/");
 392                 const unsigned char bits[] = { 0x00, 0xFE, 0xFC, 0xF8,
 393                                                 0xF0, 0xE0, 0xC0, 0x80 };
 394                 int left, count, i, plen;
 395
 396                 if (slash == NULL)
 397                         continue;
 398
 399                 prefix = g_strndup(prefix, slash - prefix);
 400                 len = strtol(slash + 1, NULL, 10);
 401                 plen = 128 - len;
 402
 403                 count = plen / 8;
 404                 left = plen % 8;
 405                 i = 16 - count;
 406
 407                 inet_pton(AF_INET6, prefix, &addr_prefix);
 408                 inet_pton(AF_INET6, address, &addr);
 409
 410                 memset(&addr_prefix.s6_addr[i], 0, count);
 411                 memset(&addr.s6_addr[i], 0, count);
 412
 413                 if (left) {
 414                         addr_prefix.s6_addr[i - 1] &= bits[left];
 415                         addr.s6_addr[i - 1] &= bits[left];
 416                 }
 417
 418                 g_free(prefix);
 419
 420                 if (memcmp(&addr_prefix, &addr, 16) == 0) {
 421                         ret = len;
 422                         break;
 423                 }
 424         }
 425
 426         return ret;
 427 }
 428
 429 static int set_addresses(GDHCPClient *dhcp_client,
 430                                                 struct connman_dhcpv6 *dhcp)
 431 {
 432         struct connman_service *service;
 433         struct connman_ipconfig *ipconfig;
 434         int entries, i;
 435         GList *option, *list;
 436         char **nameservers, **timeservers;
 437         const char *c_address;
 438         char *address = NULL;
 439
 440         service = __connman_service_lookup_from_network(dhcp->network);
 441         if (service == NULL) {
 442                 connman_error("Can not lookup service");
 443                 return -EINVAL;
 444         }
 445
 446         ipconfig = __connman_service_get_ip6config(service);
 447         if (ipconfig == NULL) {
 448                 connman_error("Could not lookup ip6config");
 449                 return -EINVAL;
 450         }
 451
 452         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_DNS_SERVERS);
 453         entries = g_list_length(option);
 454
 455         nameservers = g_try_new0(char *, entries + 1);
 456         if (nameservers != NULL) {
 457                 for (i = 0, list = option; list; list = list->next, i++)
 458                         nameservers[i] = g_strdup(list->data);
 459         }
 460
 461         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 462                 if (dhcp->nameservers != NULL) {
 463                         for (i = 0; dhcp->nameservers[i] != NULL; i++)
 464                                 __connman_service_nameserver_remove(service,
 465                                                         dhcp->nameservers[i],
 466                                                         FALSE);
 467                         g_strfreev(dhcp->nameservers);
 468                 }
 469
 470                 dhcp->nameservers = nameservers;
 471
 472                 for (i = 0; dhcp->nameservers[i] != NULL; i++)
 473                         __connman_service_nameserver_append(service,
 474                                                         dhcp->nameservers[i],
 475                                                         FALSE);
 476         } else
 477                 g_strfreev(nameservers);
 478
 479
 480         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 481         entries = g_list_length(option);
 482
 483         timeservers = g_try_new0(char *, entries + 1);
 484         if (timeservers != NULL) {
 485                 for (i = 0, list = option; list; list = list->next, i++)
 486                         timeservers[i] = g_strdup(list->data);
 487         }
 488
 489         if (compare_string_arrays(timeservers, dhcp->timeservers) == FALSE) {
 490                 if (dhcp->timeservers != NULL) {
 491                         for (i = 0; dhcp->timeservers[i] != NULL; i++)
 492                                 __connman_service_timeserver_remove(service,
 493                                                         dhcp->timeservers[i]);
 494                         g_strfreev(dhcp->timeservers);
 495                 }
 496
 497                 dhcp->timeservers = timeservers;
 498
 499                 for (i = 0; dhcp->timeservers[i] != NULL; i++)
 500                         __connman_service_timeserver_append(service,
 501                                                         dhcp->timeservers[i]);
 502         } else
 503                 g_strfreev(timeservers);
 504
 505
 506         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_NA);
 507         if (option != NULL)
 508                 address = g_strdup(option->data);
 509         else {
 510                 option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_TA);
 511                 if (option != NULL)
 512                         address = g_strdup(option->data);
 513         }
 514
 515         c_address = __connman_ipconfig_get_local(ipconfig);
 516
 517         if (address != NULL &&
 518                         ((c_address != NULL &&
 519                                 g_strcmp0(address, c_address) != 0) ||
 520                         (c_address == NULL))) {
 521                 int prefix_len;
 522
 523                 /* Is this prefix part of the subnet we are suppose to use? */
 524                 prefix_len = check_ipv6_addr_prefix(dhcp->prefixes, address);
 525
 526                 __connman_ipconfig_set_local(ipconfig, address);
 527                 __connman_ipconfig_set_prefixlen(ipconfig, prefix_len);
 528
 529                 DBG("new address %s/%d", address, prefix_len);
 530         }
 531
 532         return 0;
 533 }
 534
 535 static void re_cb(GDHCPClient *dhcp_client, gpointer user_data)
 536 {
 537         struct connman_dhcpv6 *dhcp = user_data;
 538         uint16_t status;
 539         int ret;
 540
 541         ret = set_addresses(dhcp_client, dhcp);
 542
 543         status = g_dhcpv6_client_get_status(dhcp_client);
 544
 545         DBG("dhcpv6 cb msg %p ret %d status %d", dhcp, ret, status);
 546
 547         if (ret < 0) {
 548                 if (dhcp->callback != NULL)
 549                         dhcp->callback(dhcp->network, FALSE);
 550                 return;
 551         }
 552
 553         if (status  == G_DHCPV6_ERROR_BINDING) {
 554                 /* RFC 3315, 18.1.8 */
 555                 dhcpv6_request(dhcp, FALSE);
 556         } else {
 557                 if (dhcp->callback != NULL)
 558                         dhcp->callback(dhcp->network,
 559                                                 status == 0 ? TRUE : FALSE);
 560         }
 561 }
 562
 563 static void rebind_cb(GDHCPClient *dhcp_client, gpointer user_data)
 564 {
 565         DBG("");
 566
 567         g_dhcpv6_client_reset_rebind(dhcp_client);
 568         g_dhcpv6_client_reset_renew(dhcp_client);
 569
 570         re_cb(dhcp_client, user_data);
 571 }
 572
 573 static int dhcpv6_rebind(struct connman_dhcpv6 *dhcp)
 574 {
 575         GDHCPClient *dhcp_client;
 576
 577         DBG("dhcp %p", dhcp);
 578
 579         dhcp_client = dhcp->dhcp_client;
 580
 581         g_dhcp_client_clear_requests(dhcp_client);
 582
 583         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 584         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 585         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 586
 587         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 588                                 G_DHCPV6_SNTP_SERVERS);
 589
 590         g_dhcpv6_client_set_ia(dhcp_client,
 591                         connman_network_get_index(dhcp->network),
 592                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 593                         NULL, NULL, FALSE);
 594
 595         clear_callbacks(dhcp_client);
 596
 597         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REBIND,
 598                                         rebind_cb, dhcp);
 599
 600         dhcp->dhcp_client = dhcp_client;
 601
 602         return g_dhcp_client_start(dhcp_client, NULL);
 603 }
 604
 605 static gboolean dhcpv6_restart(gpointer user_data)
 606 {
 607         struct connman_dhcpv6 *dhcp = user_data;
 608
 609         if (dhcp->callback != NULL)
 610                 dhcp->callback(dhcp->network, FALSE);
 611
 612         return FALSE;
 613 }
 614
 615 /*
 616  * Check if we need to restart the solicitation procedure. This
 617  * is done if all the addresses have expired. RFC 3315, 18.1.4
 618  */
 619 static int check_restart(struct connman_dhcpv6 *dhcp)
 620 {
 621         time_t current, expired;
 622
 623         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, NULL, NULL,
 624                                 NULL, NULL, &expired);
 625         current = time(NULL);
 626
 627         if (current > expired) {
 628                 DBG("expired by %d secs", (int)(current - expired));
 629
 630                 g_timeout_add(0, dhcpv6_restart, dhcp);
 631
 632                 return -ETIMEDOUT;
 633         }
 634
 635         return 0;
 636 }
 637
 638 static gboolean timeout_rebind(gpointer user_data)
 639 {
 640         struct connman_dhcpv6 *dhcp = user_data;
 641
 642         if (check_restart(dhcp) < 0)
 643                 return FALSE;
 644
 645         dhcp->RT = calc_delay(dhcp->RT, REB_MAX_RT);
 646
 647         DBG("rebind RT timeout %d msec", dhcp->RT);
 648
 649         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 650
 651         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 652
 653         return FALSE;
 654 }
 655
 656 static gboolean start_rebind(gpointer user_data)
 657 {
 658         struct connman_dhcpv6 *dhcp = user_data;
 659
 660         dhcp->RT = REB_TIMEOUT * (1 + get_random());
 661
 662         DBG("rebind initial RT timeout %d msec", dhcp->RT);
 663
 664         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 665
 666         dhcpv6_rebind(dhcp);
 667
 668         return FALSE;
 669 }
 670
 671 static void request_cb(GDHCPClient *dhcp_client, gpointer user_data)
 672 {
 673         DBG("");
 674
 675         re_cb(dhcp_client, user_data);
 676 }
 677
 678 static int dhcpv6_request(struct connman_dhcpv6 *dhcp,
 679                         gboolean add_addresses)
 680 {
 681         GDHCPClient *dhcp_client;
 682         uint32_t T1, T2;
 683
 684         DBG("dhcp %p add %d", dhcp, add_addresses);
 685
 686         dhcp_client = dhcp->dhcp_client;
 687
 688         g_dhcp_client_clear_requests(dhcp_client);
 689
 690         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 691         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 692         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 693         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 694
 695         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 696                                 G_DHCPV6_SNTP_SERVERS);
 697
 698         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 699         g_dhcpv6_client_set_ia(dhcp_client,
 700                         connman_network_get_index(dhcp->network),
 701                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 702                         &T1, &T2, add_addresses);
 703
 704         clear_callbacks(dhcp_client);
 705
 706         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REQUEST,
 707                                         request_cb, dhcp);
 708
 709         dhcp->dhcp_client = dhcp_client;
 710
 711         return g_dhcp_client_start(dhcp_client, NULL);
 712 }
 713
 714 static gboolean timeout_request(gpointer user_data)
 715 {
 716         struct connman_dhcpv6 *dhcp = user_data;
 717
 718         if (dhcp->request_count >= REQ_MAX_RC) {
 719                 DBG("max request retry attempts %d", dhcp->request_count);
 720                 dhcp->request_count = 0;
 721                 if (dhcp->callback != NULL)
 722                         dhcp->callback(dhcp->network, FALSE);
 723                 return FALSE;
 724         }
 725
 726         dhcp->request_count++;
 727
 728         dhcp->RT = calc_delay(dhcp->RT, REQ_MAX_RT);
 729         DBG("request RT timeout %d msec", dhcp->RT);
 730         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
 731
 732         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 733
 734         return FALSE;
 735 }
 736
 737 static void renew_cb(GDHCPClient *dhcp_client, gpointer user_data)
 738 {
 739         DBG("");
 740
 741         g_dhcpv6_client_reset_renew(dhcp_client);
 742
 743         re_cb(dhcp_client, user_data);
 744 }
 745
 746 static int dhcpv6_renew(struct connman_dhcpv6 *dhcp)
 747 {
 748         GDHCPClient *dhcp_client;
 749         uint32_t T1, T2;
 750
 751         DBG("dhcp %p", dhcp);
 752
 753         dhcp_client = dhcp->dhcp_client;
 754
 755         g_dhcp_client_clear_requests(dhcp_client);
 756
 757         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 758         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 759         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 760         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 761
 762         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 763                                 G_DHCPV6_SNTP_SERVERS);
 764
 765         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 766         g_dhcpv6_client_set_ia(dhcp_client,
 767                         connman_network_get_index(dhcp->network),
 768                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 769                         &T1, &T2, TRUE);
 770
 771         clear_callbacks(dhcp_client);
 772
 773         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_RENEW,
 774                                         renew_cb, dhcp);
 775
 776         dhcp->dhcp_client = dhcp_client;
 777
 778         return g_dhcp_client_start(dhcp_client, NULL);
 779 }
 780
 781 static gboolean timeout_renew(gpointer user_data)
 782 {
 783         struct connman_dhcpv6 *dhcp = user_data;
 784
 785         if (check_restart(dhcp) < 0)
 786                 return FALSE;
 787
 788         dhcp->RT = calc_delay(dhcp->RT, REN_MAX_RT);
 789
 790         DBG("renew RT timeout %d msec", dhcp->RT);
 791
 792         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 793
 794         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 795
 796         return FALSE;
 797 }
 798
 799 static gboolean start_renew(gpointer user_data)
 800 {
 801         struct connman_dhcpv6 *dhcp = user_data;
 802
 803         dhcp->RT = REN_TIMEOUT * (1 + get_random());
 804
 805         DBG("renew initial RT timeout %d msec", dhcp->RT);
 806
 807         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 808
 809         dhcpv6_renew(dhcp);
 810
 811         return FALSE;
 812 }
 813
 814 int __connman_dhcpv6_start_renew(struct connman_network *network,
 815                                                         dhcp_cb callback)
 816 {
 817         struct connman_dhcpv6 *dhcp;
 818         uint32_t T1, T2;
 819         time_t last_renew, last_rebind, current, expired;
 820
 821         dhcp = g_hash_table_lookup(network_table, network);
 822         if (dhcp == NULL)
 823                 return -ENOENT;
 824
 825         DBG("network %p dhcp %p", network, dhcp);
 826
 827         clear_timer(dhcp);
 828
 829         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, &T1, &T2,
 830                                 &last_renew, &last_rebind, &expired);
 831
 832         current = time(NULL);
 833
 834         DBG("T1 %u T2 %u expires %lu current %lu", T1, T2,
 835                 (unsigned long)expired, current);
 836
 837         if (T1 == 0xffffffff)
 838                 /* RFC 3315, 22.4 */
 839                 return 0;
 840
 841         if (T1 == 0)
 842                 /* RFC 3315, 22.4
 843                  * Client can choose the timeout.
 844                  */
 845                 T1 = 1800;
 846
 847         /* RFC 3315, 18.1.4, start solicit if expired */
 848         if (current > expired) {
 849                 DBG("expired by %d secs", (int)(current - expired));
 850                 return -ETIMEDOUT;
 851         }
 852
 853         dhcp->callback = callback;
 854
 855         if (T2 != 0xffffffff && T2 > 0 &&
 856                         (unsigned)current > (unsigned)last_rebind + T2) {
 857                 int timeout;
 858
 859                 /* RFC 3315, chapter 18.1.3, start rebind */
 860                 if ((unsigned)current > (unsigned)last_renew + T1)
 861                         timeout = 0;
 862                 else
 863                         timeout = last_renew - current + T1;
 864
 865                 /*
 866                  * If we just did a renew, do not restart the rebind
 867                  * immediately.
 868                  */
 869                 dhcp->timeout = g_timeout_add_seconds(timeout, start_rebind,
 870                                                 dhcp);
 871         } else {
 872                 DBG("renew after %d secs", T1);
 873
 874                 dhcp->timeout = g_timeout_add_seconds(T1, start_renew, dhcp);
 875         }
 876         return 0;
 877 }
 878
 879 int __connman_dhcpv6_start_release(struct connman_network *network,
 880                                 dhcp_cb callback)
 881 {
 882         struct connman_dhcpv6 *dhcp;
 883         GDHCPClient *dhcp_client;
 884
 885         if (network_table == NULL)
 886                 return 0;   /* we are already released */
 887
 888         dhcp = g_hash_table_lookup(network_table, network);
 889         if (dhcp == NULL)
 890                 return -ENOENT;
 891
 892         DBG("network %p dhcp %p client %p stateless %d", network, dhcp,
 893                                         dhcp->dhcp_client, dhcp->stateless);
 894
 895         if (dhcp->stateless == TRUE)
 896                 return -EINVAL;
 897
 898         clear_timer(dhcp);
 899
 900         dhcp_client = dhcp->dhcp_client;
 901         if (dhcp_client == NULL) {
 902                 /*
 903                  * We had started the DHCPv6 handshaking i.e., we have called
 904                  * __connman_dhcpv6_start() but it has not yet sent
 905                  * a solicitation message to server. This means that we do not
 906                  * have DHCPv6 configured yet so we can just quit here.
 907                  */
 908                 DBG("DHCPv6 was not started");
 909                 return 0;
 910         }
 911
 912         g_dhcp_client_clear_requests(dhcp_client);
 913         g_dhcp_client_clear_values(dhcp_client);
 914
 915         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 916         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 917
 918         g_dhcpv6_client_set_ia(dhcp_client,
 919                         connman_network_get_index(dhcp->network),
 920                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 921                         NULL, NULL, TRUE);
 922
 923         clear_callbacks(dhcp_client);
 924
 925         /*
 926          * We do not register callback here because the answer might take too
 927          * long time and network code might be in the middle of the disconnect.
 928          * So we just inform the server that we are done with the addresses
 929          * but ignore the reply from server. This is allowed by RFC 3315
 930          * chapter 18.1.6.
 931          */
 932
 933         dhcp->dhcp_client = dhcp_client;
 934
 935         return g_dhcp_client_start(dhcp_client, NULL);
 936 }
 937
 938 static int dhcpv6_release(struct connman_dhcpv6 *dhcp)
 939 {
 940         DBG("dhcp %p", dhcp);
 941
 942         clear_timer(dhcp);
 943
 944         dhcpv6_free(dhcp);
 945
 946         if (dhcp->dhcp_client == NULL)
 947                 return 0;
 948
 949         g_dhcp_client_stop(dhcp->dhcp_client);
 950         g_dhcp_client_unref(dhcp->dhcp_client);
 951
 952         dhcp->dhcp_client = NULL;
 953
 954         return 0;
 955 }
 956
 957 static void remove_network(gpointer user_data)
 958 {
 959         struct connman_dhcpv6 *dhcp = user_data;
 960
 961         DBG("dhcp %p", dhcp);
 962
 963         dhcpv6_release(dhcp);
 964
 965         g_free(dhcp);
 966 }
 967
 968 static gboolean timeout_info_req(gpointer user_data)
 969 {
 970         struct connman_dhcpv6 *dhcp = user_data;
 971
 972         dhcp->RT = calc_delay(dhcp->RT, INF_MAX_RT);
 973
 974         DBG("info RT timeout %d msec", dhcp->RT);
 975
 976         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 977
 978         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 979
 980         return FALSE;
 981 }
 982
 983 static gboolean start_info_req(gpointer user_data)
 984 {
 985         struct connman_dhcpv6 *dhcp = user_data;
 986
 987         /* Set the retransmission timeout, RFC 3315 chapter 14 */
 988         dhcp->RT = INF_TIMEOUT * (1 + get_random());
 989
 990         DBG("info initial RT timeout %d msec", dhcp->RT);
 991
 992         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 993
 994         dhcpv6_info_request(dhcp);
 995
 996         return FALSE;
 997 }
 998
 999 int __connman_dhcpv6_start_info(struct connman_network *network,
1000                                 dhcp_cb callback)
1001 {
1002         struct connman_dhcpv6 *dhcp;
1003         int delay;
1004
1005         DBG("");
1006
1007         if (network_table != NULL) {
1008                 dhcp = g_hash_table_lookup(network_table, network);
1009                 if (dhcp != NULL && dhcp->started == TRUE)
1010                         return -EBUSY;
1011         }
1012
1013         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1014         if (dhcp == NULL)
1015                 return -ENOMEM;
1016
1017         dhcp->network = network;
1018         dhcp->callback = callback;
1019         dhcp->stateless = TRUE;
1020         dhcp->started = TRUE;
1021
1022         connman_network_ref(network);
1023
1024         DBG("replace network %p dhcp %p", network, dhcp);
1025
1026         g_hash_table_replace(network_table, network, dhcp);
1027
1028         /* Initial timeout, RFC 3315, 18.1.5 */
1029         delay = rand() % 1000;
1030
1031         dhcp->timeout = g_timeout_add(delay, start_info_req, dhcp);
1032
1033         return 0;
1034 }
1035
1036 static void advertise_cb(GDHCPClient *dhcp_client, gpointer user_data)
1037 {
1038         struct connman_dhcpv6 *dhcp = user_data;
1039
1040         DBG("dhcpv6 advertise msg %p", dhcp);
1041
1042         clear_timer(dhcp);
1043
1044         if (g_dhcpv6_client_get_status(dhcp_client) != 0) {
1045                 if (dhcp->callback != NULL)
1046                         dhcp->callback(dhcp->network, FALSE);
1047                 return;
1048         }
1049
1050         dhcp->RT = REQ_TIMEOUT * (1 + get_random());
1051         DBG("request initial RT timeout %d msec", dhcp->RT);
1052         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
1053
1054         dhcp->request_count = 1;
1055
1056         dhcpv6_request(dhcp, TRUE);
1057 }
1058
1059 static void solicitation_cb(GDHCPClient *dhcp_client, gpointer user_data)
1060 {
1061         /* We get here if server supports rapid commit */
1062         struct connman_dhcpv6 *dhcp = user_data;
1063
1064         DBG("dhcpv6 solicitation msg %p", dhcp);
1065
1066         clear_timer(dhcp);
1067
1068         set_addresses(dhcp_client, dhcp);
1069 }
1070
1071 static gboolean timeout_solicitation(gpointer user_data)
1072 {
1073         struct connman_dhcpv6 *dhcp = user_data;
1074
1075         dhcp->RT = calc_delay(dhcp->RT, SOL_MAX_RT);
1076
1077         DBG("solicit RT timeout %d msec", dhcp->RT);
1078
1079         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1080
1081         g_dhcp_client_start(dhcp->dhcp_client, NULL);
1082
1083         return FALSE;
1084 }
1085
1086 static int dhcpv6_solicitation(struct connman_dhcpv6 *dhcp)
1087 {
1088         struct connman_service *service;
1089         struct connman_ipconfig *ipconfig_ipv6;
1090         GDHCPClient *dhcp_client;
1091         GDHCPClientError error;
1092         int index, ret;
1093
1094         DBG("dhcp %p", dhcp);
1095
1096         index = connman_network_get_index(dhcp->network);
1097
1098         dhcp_client = g_dhcp_client_new(G_DHCP_IPV6, index, &error);
1099         if (error != G_DHCP_CLIENT_ERROR_NONE) {
1100                 clear_timer(dhcp);
1101                 return -EINVAL;
1102         }
1103
1104         if (getenv("CONNMAN_DHCPV6_DEBUG"))
1105                 g_dhcp_client_set_debug(dhcp_client, dhcpv6_debug, "DHCPv6");
1106
1107         service = __connman_service_lookup_from_network(dhcp->network);
1108         if (service == NULL) {
1109                 clear_timer(dhcp);
1110                 g_dhcp_client_unref(dhcp_client);
1111                 return -EINVAL;
1112         }
1113
1114         ret = set_duid(service, dhcp->network, dhcp_client, index);
1115         if (ret < 0) {
1116                 clear_timer(dhcp);
1117                 g_dhcp_client_unref(dhcp_client);
1118                 return ret;
1119         }
1120
1121         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
1122         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_RAPID_COMMIT);
1123         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
1124         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
1125
1126         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
1127                                 G_DHCPV6_SNTP_SERVERS);
1128
1129         ipconfig_ipv6 = __connman_service_get_ip6config(service);
1130         dhcp->use_ta = __connman_ipconfig_ipv6_privacy_enabled(ipconfig_ipv6);
1131
1132         g_dhcpv6_client_set_ia(dhcp_client, index,
1133                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
1134                         NULL, NULL, FALSE);
1135
1136         clear_callbacks(dhcp_client);
1137
1138         g_dhcp_client_register_event(dhcp_client,
1139                                 G_DHCP_CLIENT_EVENT_SOLICITATION,
1140                                 solicitation_cb, dhcp);
1141
1142         g_dhcp_client_register_event(dhcp_client,
1143                                 G_DHCP_CLIENT_EVENT_ADVERTISE,
1144                                 advertise_cb, dhcp);
1145
1146         dhcp->dhcp_client = dhcp_client;
1147
1148         return g_dhcp_client_start(dhcp_client, NULL);
1149 }
1150
1151 static gboolean start_solicitation(gpointer user_data)
1152 {
1153         struct connman_dhcpv6 *dhcp = user_data;
1154
1155         /* Set the retransmission timeout, RFC 3315 chapter 14 */
1156         dhcp->RT = SOL_TIMEOUT * (1 + get_random());
1157
1158         DBG("solicit initial RT timeout %d msec", dhcp->RT);
1159
1160         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1161
1162         dhcpv6_solicitation(dhcp);
1163
1164         return FALSE;
1165 }
1166
1167 int __connman_dhcpv6_start(struct connman_network *network,
1168                                 GSList *prefixes, dhcp_cb callback)
1169 {
1170         struct connman_dhcpv6 *dhcp;
1171         int delay;
1172
1173         DBG("");
1174
1175         if (network_table != NULL) {
1176                 dhcp = g_hash_table_lookup(network_table, network);
1177                 if (dhcp != NULL && dhcp->started == TRUE)
1178                         return -EBUSY;
1179         }
1180
1181         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1182         if (dhcp == NULL)
1183                 return -ENOMEM;
1184
1185         dhcp->network = network;
1186         dhcp->callback = callback;
1187         dhcp->prefixes = prefixes;
1188         dhcp->started = TRUE;
1189
1190         connman_network_ref(network);
1191
1192         DBG("replace network %p dhcp %p", network, dhcp);
1193
1194         g_hash_table_replace(network_table, network, dhcp);
1195
1196         /* Initial timeout, RFC 3315, 17.1.2 */
1197         delay = rand() % 1000;
1198
1199         dhcp->timeout = g_timeout_add(delay, start_solicitation, dhcp);
1200
1201         return 0;
1202 }
1203
1204 void __connman_dhcpv6_stop(struct connman_network *network)
1205 {
1206         DBG("");
1207
1208         if (network_table == NULL)
1209                 return;
1210
1211         if (g_hash_table_remove(network_table, network) == TRUE)
1212                 connman_network_unref(network);
1213 }
1214
1215 int __connman_dhcpv6_init(void)
1216 {
1217         DBG("");
1218
1219         srand(time(NULL));
1220
1221         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
1222                                                         NULL, remove_network);
1223
1224         return 0;
1225 }
1226
1227 void __connman_dhcpv6_cleanup(void)
1228 {
1229         DBG("");
1230
1231         g_hash_table_destroy(network_table);
1232         network_table = NULL;
1233 }