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 != NULL &&
 295                                         dhcp->nameservers[i] != NULL; i++)
 296                         __connman_service_nameserver_append(service,
 297                                                 dhcp->nameservers[i],
 298                                                 FALSE);
 299         } else
 300                 g_strfreev(nameservers);
 301
 302
 303         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 304         entries = g_list_length(option);
 305
 306         timeservers = g_try_new0(char *, entries + 1);
 307         if (timeservers != NULL) {
 308                 for (i = 0, list = option; list; list = list->next, i++)
 309                         timeservers[i] = g_strdup(list->data);
 310         }
 311
 312         if (compare_string_arrays(timeservers, dhcp->timeservers) == FALSE) {
 313                 if (dhcp->timeservers != NULL) {
 314                         for (i = 0; dhcp->timeservers[i] != NULL; i++)
 315                                 __connman_service_timeserver_remove(service,
 316                                                         dhcp->timeservers[i]);
 317                         g_strfreev(dhcp->timeservers);
 318                 }
 319
 320                 dhcp->timeservers = timeservers;
 321
 322                 for (i = 0; dhcp->timeservers != NULL &&
 323                                         dhcp->timeservers[i] != NULL; i++)
 324                         __connman_service_timeserver_append(service,
 325                                                         dhcp->timeservers[i]);
 326         } else
 327                 g_strfreev(timeservers);
 328
 329
 330         if (dhcp->callback != NULL) {
 331                 uint16_t status = g_dhcpv6_client_get_status(dhcp_client);
 332                 dhcp->callback(dhcp->network, status == 0 ? TRUE : FALSE);
 333         }
 334 }
 335
 336 static int dhcpv6_info_request(struct connman_dhcpv6 *dhcp)
 337 {
 338         struct connman_service *service;
 339         GDHCPClient *dhcp_client;
 340         GDHCPClientError error;
 341         int index, ret;
 342
 343         DBG("dhcp %p", dhcp);
 344
 345         index = connman_network_get_index(dhcp->network);
 346
 347         dhcp_client = g_dhcp_client_new(G_DHCP_IPV6, index, &error);
 348         if (error != G_DHCP_CLIENT_ERROR_NONE) {
 349                 clear_timer(dhcp);
 350                 return -EINVAL;
 351         }
 352
 353         if (getenv("CONNMAN_DHCPV6_DEBUG"))
 354                 g_dhcp_client_set_debug(dhcp_client, dhcpv6_debug, "DHCPv6");
 355
 356         service = __connman_service_lookup_from_network(dhcp->network);
 357         if (service == NULL) {
 358                 clear_timer(dhcp);
 359                 g_dhcp_client_unref(dhcp_client);
 360                 return -EINVAL;
 361         }
 362
 363         ret = set_duid(service, dhcp->network, dhcp_client, index);
 364         if (ret < 0) {
 365                 clear_timer(dhcp);
 366                 g_dhcp_client_unref(dhcp_client);
 367                 return ret;
 368         }
 369
 370         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 371         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 372         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 373
 374         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 375                                 G_DHCPV6_SNTP_SERVERS);
 376
 377         g_dhcp_client_register_event(dhcp_client,
 378                         G_DHCP_CLIENT_EVENT_INFORMATION_REQ, info_req_cb, dhcp);
 379
 380         dhcp->dhcp_client = dhcp_client;
 381
 382         return g_dhcp_client_start(dhcp_client, NULL);
 383 }
 384
 385 static int check_ipv6_addr_prefix(GSList *prefixes, char *address)
 386 {
 387         struct in6_addr addr_prefix, addr;
 388         GSList *list;
 389         int ret = 128, len;
 390
 391         for (list = prefixes; list; list = list->next) {
 392                 char *prefix = list->data;
 393                 const char *slash = g_strrstr(prefix, "/");
 394                 const unsigned char bits[] = { 0x00, 0xFE, 0xFC, 0xF8,
 395                                                 0xF0, 0xE0, 0xC0, 0x80 };
 396                 int left, count, i, plen;
 397
 398                 if (slash == NULL)
 399                         continue;
 400
 401                 prefix = g_strndup(prefix, slash - prefix);
 402                 len = strtol(slash + 1, NULL, 10);
 403                 plen = 128 - len;
 404
 405                 count = plen / 8;
 406                 left = plen % 8;
 407                 i = 16 - count;
 408
 409                 inet_pton(AF_INET6, prefix, &addr_prefix);
 410                 inet_pton(AF_INET6, address, &addr);
 411
 412                 memset(&addr_prefix.s6_addr[i], 0, count);
 413                 memset(&addr.s6_addr[i], 0, count);
 414
 415                 if (left) {
 416                         addr_prefix.s6_addr[i - 1] &= bits[left];
 417                         addr.s6_addr[i - 1] &= bits[left];
 418                 }
 419
 420                 g_free(prefix);
 421
 422                 if (memcmp(&addr_prefix, &addr, 16) == 0) {
 423                         ret = len;
 424                         break;
 425                 }
 426         }
 427
 428         return ret;
 429 }
 430
 431 static int set_addresses(GDHCPClient *dhcp_client,
 432                                                 struct connman_dhcpv6 *dhcp)
 433 {
 434         struct connman_service *service;
 435         struct connman_ipconfig *ipconfig;
 436         int entries, i;
 437         GList *option, *list;
 438         char **nameservers, **timeservers;
 439         const char *c_address;
 440         char *address = NULL;
 441
 442         service = __connman_service_lookup_from_network(dhcp->network);
 443         if (service == NULL) {
 444                 connman_error("Can not lookup service");
 445                 return -EINVAL;
 446         }
 447
 448         ipconfig = __connman_service_get_ip6config(service);
 449         if (ipconfig == NULL) {
 450                 connman_error("Could not lookup ip6config");
 451                 return -EINVAL;
 452         }
 453
 454         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_DNS_SERVERS);
 455         entries = g_list_length(option);
 456
 457         nameservers = g_try_new0(char *, entries + 1);
 458         if (nameservers != NULL) {
 459                 for (i = 0, list = option; list; list = list->next, i++)
 460                         nameservers[i] = g_strdup(list->data);
 461         }
 462
 463         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 464                 if (dhcp->nameservers != NULL) {
 465                         for (i = 0; dhcp->nameservers[i] != NULL; i++)
 466                                 __connman_service_nameserver_remove(service,
 467                                                         dhcp->nameservers[i],
 468                                                         FALSE);
 469                         g_strfreev(dhcp->nameservers);
 470                 }
 471
 472                 dhcp->nameservers = nameservers;
 473
 474                 for (i = 0; dhcp->nameservers[i] != NULL; i++)
 475                         __connman_service_nameserver_append(service,
 476                                                         dhcp->nameservers[i],
 477                                                         FALSE);
 478         } else
 479                 g_strfreev(nameservers);
 480
 481
 482         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 483         entries = g_list_length(option);
 484
 485         timeservers = g_try_new0(char *, entries + 1);
 486         if (timeservers != NULL) {
 487                 for (i = 0, list = option; list; list = list->next, i++)
 488                         timeservers[i] = g_strdup(list->data);
 489         }
 490
 491         if (compare_string_arrays(timeservers, dhcp->timeservers) == FALSE) {
 492                 if (dhcp->timeservers != NULL) {
 493                         for (i = 0; dhcp->timeservers[i] != NULL; i++)
 494                                 __connman_service_timeserver_remove(service,
 495                                                         dhcp->timeservers[i]);
 496                         g_strfreev(dhcp->timeservers);
 497                 }
 498
 499                 dhcp->timeservers = timeservers;
 500
 501                 for (i = 0; dhcp->timeservers[i] != NULL; i++)
 502                         __connman_service_timeserver_append(service,
 503                                                         dhcp->timeservers[i]);
 504         } else
 505                 g_strfreev(timeservers);
 506
 507
 508         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_NA);
 509         if (option != NULL)
 510                 address = g_strdup(option->data);
 511         else {
 512                 option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_TA);
 513                 if (option != NULL)
 514                         address = g_strdup(option->data);
 515         }
 516
 517         c_address = __connman_ipconfig_get_local(ipconfig);
 518
 519         if (address != NULL &&
 520                         ((c_address != NULL &&
 521                                 g_strcmp0(address, c_address) != 0) ||
 522                         (c_address == NULL))) {
 523                 int prefix_len;
 524
 525                 /* Is this prefix part of the subnet we are suppose to use? */
 526                 prefix_len = check_ipv6_addr_prefix(dhcp->prefixes, address);
 527
 528                 __connman_ipconfig_set_local(ipconfig, address);
 529                 __connman_ipconfig_set_prefixlen(ipconfig, prefix_len);
 530
 531                 DBG("new address %s/%d", address, prefix_len);
 532         }
 533
 534         return 0;
 535 }
 536
 537 static void re_cb(GDHCPClient *dhcp_client, gpointer user_data)
 538 {
 539         struct connman_dhcpv6 *dhcp = user_data;
 540         uint16_t status;
 541         int ret;
 542
 543         ret = set_addresses(dhcp_client, dhcp);
 544
 545         status = g_dhcpv6_client_get_status(dhcp_client);
 546
 547         DBG("dhcpv6 cb msg %p ret %d status %d", dhcp, ret, status);
 548
 549         if (ret < 0) {
 550                 if (dhcp->callback != NULL)
 551                         dhcp->callback(dhcp->network, FALSE);
 552                 return;
 553         }
 554
 555         if (status  == G_DHCPV6_ERROR_BINDING) {
 556                 /* RFC 3315, 18.1.8 */
 557                 dhcpv6_request(dhcp, FALSE);
 558         } else {
 559                 if (dhcp->callback != NULL)
 560                         dhcp->callback(dhcp->network,
 561                                                 status == 0 ? TRUE : FALSE);
 562         }
 563 }
 564
 565 static void rebind_cb(GDHCPClient *dhcp_client, gpointer user_data)
 566 {
 567         DBG("");
 568
 569         g_dhcpv6_client_reset_rebind(dhcp_client);
 570         g_dhcpv6_client_reset_renew(dhcp_client);
 571
 572         re_cb(dhcp_client, user_data);
 573 }
 574
 575 static int dhcpv6_rebind(struct connman_dhcpv6 *dhcp)
 576 {
 577         GDHCPClient *dhcp_client;
 578
 579         DBG("dhcp %p", dhcp);
 580
 581         dhcp_client = dhcp->dhcp_client;
 582
 583         g_dhcp_client_clear_requests(dhcp_client);
 584
 585         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 586         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 587         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 588
 589         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 590                                 G_DHCPV6_SNTP_SERVERS);
 591
 592         g_dhcpv6_client_set_ia(dhcp_client,
 593                         connman_network_get_index(dhcp->network),
 594                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 595                         NULL, NULL, FALSE);
 596
 597         clear_callbacks(dhcp_client);
 598
 599         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REBIND,
 600                                         rebind_cb, dhcp);
 601
 602         dhcp->dhcp_client = dhcp_client;
 603
 604         return g_dhcp_client_start(dhcp_client, NULL);
 605 }
 606
 607 static gboolean dhcpv6_restart(gpointer user_data)
 608 {
 609         struct connman_dhcpv6 *dhcp = user_data;
 610
 611         if (dhcp->callback != NULL)
 612                 dhcp->callback(dhcp->network, FALSE);
 613
 614         return FALSE;
 615 }
 616
 617 /*
 618  * Check if we need to restart the solicitation procedure. This
 619  * is done if all the addresses have expired. RFC 3315, 18.1.4
 620  */
 621 static int check_restart(struct connman_dhcpv6 *dhcp)
 622 {
 623         time_t current, expired;
 624
 625         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, NULL, NULL,
 626                                 NULL, NULL, &expired);
 627         current = time(NULL);
 628
 629         if (current > expired) {
 630                 DBG("expired by %d secs", (int)(current - expired));
 631
 632                 g_timeout_add(0, dhcpv6_restart, dhcp);
 633
 634                 return -ETIMEDOUT;
 635         }
 636
 637         return 0;
 638 }
 639
 640 static gboolean timeout_rebind(gpointer user_data)
 641 {
 642         struct connman_dhcpv6 *dhcp = user_data;
 643
 644         if (check_restart(dhcp) < 0)
 645                 return FALSE;
 646
 647         dhcp->RT = calc_delay(dhcp->RT, REB_MAX_RT);
 648
 649         DBG("rebind RT timeout %d msec", dhcp->RT);
 650
 651         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 652
 653         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 654
 655         return FALSE;
 656 }
 657
 658 static gboolean start_rebind(gpointer user_data)
 659 {
 660         struct connman_dhcpv6 *dhcp = user_data;
 661
 662         dhcp->RT = REB_TIMEOUT * (1 + get_random());
 663
 664         DBG("rebind initial RT timeout %d msec", dhcp->RT);
 665
 666         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 667
 668         dhcpv6_rebind(dhcp);
 669
 670         return FALSE;
 671 }
 672
 673 static void request_cb(GDHCPClient *dhcp_client, gpointer user_data)
 674 {
 675         DBG("");
 676
 677         re_cb(dhcp_client, user_data);
 678 }
 679
 680 static int dhcpv6_request(struct connman_dhcpv6 *dhcp,
 681                         gboolean add_addresses)
 682 {
 683         GDHCPClient *dhcp_client;
 684         uint32_t T1, T2;
 685
 686         DBG("dhcp %p add %d", dhcp, add_addresses);
 687
 688         dhcp_client = dhcp->dhcp_client;
 689
 690         g_dhcp_client_clear_requests(dhcp_client);
 691
 692         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 693         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 694         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 695         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 696
 697         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 698                                 G_DHCPV6_SNTP_SERVERS);
 699
 700         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 701         g_dhcpv6_client_set_ia(dhcp_client,
 702                         connman_network_get_index(dhcp->network),
 703                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 704                         &T1, &T2, add_addresses);
 705
 706         clear_callbacks(dhcp_client);
 707
 708         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REQUEST,
 709                                         request_cb, dhcp);
 710
 711         dhcp->dhcp_client = dhcp_client;
 712
 713         return g_dhcp_client_start(dhcp_client, NULL);
 714 }
 715
 716 static gboolean timeout_request(gpointer user_data)
 717 {
 718         struct connman_dhcpv6 *dhcp = user_data;
 719
 720         if (dhcp->request_count >= REQ_MAX_RC) {
 721                 DBG("max request retry attempts %d", dhcp->request_count);
 722                 dhcp->request_count = 0;
 723                 if (dhcp->callback != NULL)
 724                         dhcp->callback(dhcp->network, FALSE);
 725                 return FALSE;
 726         }
 727
 728         dhcp->request_count++;
 729
 730         dhcp->RT = calc_delay(dhcp->RT, REQ_MAX_RT);
 731         DBG("request RT timeout %d msec", dhcp->RT);
 732         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
 733
 734         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 735
 736         return FALSE;
 737 }
 738
 739 static void renew_cb(GDHCPClient *dhcp_client, gpointer user_data)
 740 {
 741         DBG("");
 742
 743         g_dhcpv6_client_reset_renew(dhcp_client);
 744
 745         re_cb(dhcp_client, user_data);
 746 }
 747
 748 static int dhcpv6_renew(struct connman_dhcpv6 *dhcp)
 749 {
 750         GDHCPClient *dhcp_client;
 751         uint32_t T1, T2;
 752
 753         DBG("dhcp %p", dhcp);
 754
 755         dhcp_client = dhcp->dhcp_client;
 756
 757         g_dhcp_client_clear_requests(dhcp_client);
 758
 759         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 760         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 761         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 762         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 763
 764         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 765                                 G_DHCPV6_SNTP_SERVERS);
 766
 767         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 768         g_dhcpv6_client_set_ia(dhcp_client,
 769                         connman_network_get_index(dhcp->network),
 770                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 771                         &T1, &T2, TRUE);
 772
 773         clear_callbacks(dhcp_client);
 774
 775         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_RENEW,
 776                                         renew_cb, dhcp);
 777
 778         dhcp->dhcp_client = dhcp_client;
 779
 780         return g_dhcp_client_start(dhcp_client, NULL);
 781 }
 782
 783 static gboolean timeout_renew(gpointer user_data)
 784 {
 785         struct connman_dhcpv6 *dhcp = user_data;
 786
 787         if (check_restart(dhcp) < 0)
 788                 return FALSE;
 789
 790         dhcp->RT = calc_delay(dhcp->RT, REN_MAX_RT);
 791
 792         DBG("renew RT timeout %d msec", dhcp->RT);
 793
 794         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 795
 796         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 797
 798         return FALSE;
 799 }
 800
 801 static gboolean start_renew(gpointer user_data)
 802 {
 803         struct connman_dhcpv6 *dhcp = user_data;
 804
 805         dhcp->RT = REN_TIMEOUT * (1 + get_random());
 806
 807         DBG("renew initial RT timeout %d msec", dhcp->RT);
 808
 809         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 810
 811         dhcpv6_renew(dhcp);
 812
 813         return FALSE;
 814 }
 815
 816 int __connman_dhcpv6_start_renew(struct connman_network *network,
 817                                                         dhcp_cb callback)
 818 {
 819         struct connman_dhcpv6 *dhcp;
 820         uint32_t T1, T2;
 821         time_t last_renew, last_rebind, current, expired;
 822
 823         dhcp = g_hash_table_lookup(network_table, network);
 824         if (dhcp == NULL)
 825                 return -ENOENT;
 826
 827         DBG("network %p dhcp %p", network, dhcp);
 828
 829         clear_timer(dhcp);
 830
 831         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, &T1, &T2,
 832                                 &last_renew, &last_rebind, &expired);
 833
 834         current = time(NULL);
 835
 836         DBG("T1 %u T2 %u expires %lu current %lu", T1, T2,
 837                 (unsigned long)expired, current);
 838
 839         if (T1 == 0xffffffff)
 840                 /* RFC 3315, 22.4 */
 841                 return 0;
 842
 843         if (T1 == 0)
 844                 /* RFC 3315, 22.4
 845                  * Client can choose the timeout.
 846                  */
 847                 T1 = 1800;
 848
 849         /* RFC 3315, 18.1.4, start solicit if expired */
 850         if (current > expired) {
 851                 DBG("expired by %d secs", (int)(current - expired));
 852                 return -ETIMEDOUT;
 853         }
 854
 855         dhcp->callback = callback;
 856
 857         if (T2 != 0xffffffff && T2 > 0 &&
 858                         (unsigned)current > (unsigned)last_rebind + T2) {
 859                 int timeout;
 860
 861                 /* RFC 3315, chapter 18.1.3, start rebind */
 862                 if ((unsigned)current > (unsigned)last_renew + T1)
 863                         timeout = 0;
 864                 else
 865                         timeout = last_renew - current + T1;
 866
 867                 /*
 868                  * If we just did a renew, do not restart the rebind
 869                  * immediately.
 870                  */
 871                 dhcp->timeout = g_timeout_add_seconds(timeout, start_rebind,
 872                                                 dhcp);
 873         } else {
 874                 DBG("renew after %d secs", T1);
 875
 876                 dhcp->timeout = g_timeout_add_seconds(T1, start_renew, dhcp);
 877         }
 878         return 0;
 879 }
 880
 881 int __connman_dhcpv6_start_release(struct connman_network *network,
 882                                 dhcp_cb callback)
 883 {
 884         struct connman_dhcpv6 *dhcp;
 885         GDHCPClient *dhcp_client;
 886
 887         if (network_table == NULL)
 888                 return 0;   /* we are already released */
 889
 890         dhcp = g_hash_table_lookup(network_table, network);
 891         if (dhcp == NULL)
 892                 return -ENOENT;
 893
 894         DBG("network %p dhcp %p client %p stateless %d", network, dhcp,
 895                                         dhcp->dhcp_client, dhcp->stateless);
 896
 897         if (dhcp->stateless == TRUE)
 898                 return -EINVAL;
 899
 900         clear_timer(dhcp);
 901
 902         dhcp_client = dhcp->dhcp_client;
 903         if (dhcp_client == NULL) {
 904                 /*
 905                  * We had started the DHCPv6 handshaking i.e., we have called
 906                  * __connman_dhcpv6_start() but it has not yet sent
 907                  * a solicitation message to server. This means that we do not
 908                  * have DHCPv6 configured yet so we can just quit here.
 909                  */
 910                 DBG("DHCPv6 was not started");
 911                 return 0;
 912         }
 913
 914         g_dhcp_client_clear_requests(dhcp_client);
 915         g_dhcp_client_clear_values(dhcp_client);
 916
 917         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 918         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 919
 920         g_dhcpv6_client_set_ia(dhcp_client,
 921                         connman_network_get_index(dhcp->network),
 922                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 923                         NULL, NULL, TRUE);
 924
 925         clear_callbacks(dhcp_client);
 926
 927         /*
 928          * We do not register callback here because the answer might take too
 929          * long time and network code might be in the middle of the disconnect.
 930          * So we just inform the server that we are done with the addresses
 931          * but ignore the reply from server. This is allowed by RFC 3315
 932          * chapter 18.1.6.
 933          */
 934
 935         dhcp->dhcp_client = dhcp_client;
 936
 937         return g_dhcp_client_start(dhcp_client, NULL);
 938 }
 939
 940 static int dhcpv6_release(struct connman_dhcpv6 *dhcp)
 941 {
 942         DBG("dhcp %p", dhcp);
 943
 944         clear_timer(dhcp);
 945
 946         dhcpv6_free(dhcp);
 947
 948         if (dhcp->dhcp_client == NULL)
 949                 return 0;
 950
 951         g_dhcp_client_stop(dhcp->dhcp_client);
 952         g_dhcp_client_unref(dhcp->dhcp_client);
 953
 954         dhcp->dhcp_client = NULL;
 955
 956         return 0;
 957 }
 958
 959 static void remove_network(gpointer user_data)
 960 {
 961         struct connman_dhcpv6 *dhcp = user_data;
 962
 963         DBG("dhcp %p", dhcp);
 964
 965         dhcpv6_release(dhcp);
 966
 967         g_free(dhcp);
 968 }
 969
 970 static gboolean timeout_info_req(gpointer user_data)
 971 {
 972         struct connman_dhcpv6 *dhcp = user_data;
 973
 974         dhcp->RT = calc_delay(dhcp->RT, INF_MAX_RT);
 975
 976         DBG("info RT timeout %d msec", dhcp->RT);
 977
 978         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 979
 980         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 981
 982         return FALSE;
 983 }
 984
 985 static gboolean start_info_req(gpointer user_data)
 986 {
 987         struct connman_dhcpv6 *dhcp = user_data;
 988
 989         /* Set the retransmission timeout, RFC 3315 chapter 14 */
 990         dhcp->RT = INF_TIMEOUT * (1 + get_random());
 991
 992         DBG("info initial RT timeout %d msec", dhcp->RT);
 993
 994         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 995
 996         dhcpv6_info_request(dhcp);
 997
 998         return FALSE;
 999 }
1000
1001 int __connman_dhcpv6_start_info(struct connman_network *network,
1002                                 dhcp_cb callback)
1003 {
1004         struct connman_dhcpv6 *dhcp;
1005         int delay;
1006
1007         DBG("");
1008
1009         if (network_table != NULL) {
1010                 dhcp = g_hash_table_lookup(network_table, network);
1011                 if (dhcp != NULL && dhcp->started == TRUE)
1012                         return -EBUSY;
1013         }
1014
1015         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1016         if (dhcp == NULL)
1017                 return -ENOMEM;
1018
1019         dhcp->network = network;
1020         dhcp->callback = callback;
1021         dhcp->stateless = TRUE;
1022         dhcp->started = TRUE;
1023
1024         connman_network_ref(network);
1025
1026         DBG("replace network %p dhcp %p", network, dhcp);
1027
1028         g_hash_table_replace(network_table, network, dhcp);
1029
1030         /* Initial timeout, RFC 3315, 18.1.5 */
1031         delay = rand() % 1000;
1032
1033         dhcp->timeout = g_timeout_add(delay, start_info_req, dhcp);
1034
1035         return 0;
1036 }
1037
1038 static void advertise_cb(GDHCPClient *dhcp_client, gpointer user_data)
1039 {
1040         struct connman_dhcpv6 *dhcp = user_data;
1041
1042         DBG("dhcpv6 advertise msg %p", dhcp);
1043
1044         clear_timer(dhcp);
1045
1046         if (g_dhcpv6_client_get_status(dhcp_client) != 0) {
1047                 if (dhcp->callback != NULL)
1048                         dhcp->callback(dhcp->network, FALSE);
1049                 return;
1050         }
1051
1052         dhcp->RT = REQ_TIMEOUT * (1 + get_random());
1053         DBG("request initial RT timeout %d msec", dhcp->RT);
1054         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
1055
1056         dhcp->request_count = 1;
1057
1058         dhcpv6_request(dhcp, TRUE);
1059 }
1060
1061 static void solicitation_cb(GDHCPClient *dhcp_client, gpointer user_data)
1062 {
1063         /* We get here if server supports rapid commit */
1064         struct connman_dhcpv6 *dhcp = user_data;
1065
1066         DBG("dhcpv6 solicitation msg %p", dhcp);
1067
1068         clear_timer(dhcp);
1069
1070         set_addresses(dhcp_client, dhcp);
1071 }
1072
1073 static gboolean timeout_solicitation(gpointer user_data)
1074 {
1075         struct connman_dhcpv6 *dhcp = user_data;
1076
1077         dhcp->RT = calc_delay(dhcp->RT, SOL_MAX_RT);
1078
1079         DBG("solicit RT timeout %d msec", dhcp->RT);
1080
1081         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1082
1083         g_dhcp_client_start(dhcp->dhcp_client, NULL);
1084
1085         return FALSE;
1086 }
1087
1088 static int dhcpv6_solicitation(struct connman_dhcpv6 *dhcp)
1089 {
1090         struct connman_service *service;
1091         struct connman_ipconfig *ipconfig_ipv6;
1092         GDHCPClient *dhcp_client;
1093         GDHCPClientError error;
1094         int index, ret;
1095
1096         DBG("dhcp %p", dhcp);
1097
1098         index = connman_network_get_index(dhcp->network);
1099
1100         dhcp_client = g_dhcp_client_new(G_DHCP_IPV6, index, &error);
1101         if (error != G_DHCP_CLIENT_ERROR_NONE) {
1102                 clear_timer(dhcp);
1103                 return -EINVAL;
1104         }
1105
1106         if (getenv("CONNMAN_DHCPV6_DEBUG"))
1107                 g_dhcp_client_set_debug(dhcp_client, dhcpv6_debug, "DHCPv6");
1108
1109         service = __connman_service_lookup_from_network(dhcp->network);
1110         if (service == NULL) {
1111                 clear_timer(dhcp);
1112                 g_dhcp_client_unref(dhcp_client);
1113                 return -EINVAL;
1114         }
1115
1116         ret = set_duid(service, dhcp->network, dhcp_client, index);
1117         if (ret < 0) {
1118                 clear_timer(dhcp);
1119                 g_dhcp_client_unref(dhcp_client);
1120                 return ret;
1121         }
1122
1123         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
1124         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_RAPID_COMMIT);
1125         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
1126         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
1127
1128         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
1129                                 G_DHCPV6_SNTP_SERVERS);
1130
1131         ipconfig_ipv6 = __connman_service_get_ip6config(service);
1132         dhcp->use_ta = __connman_ipconfig_ipv6_privacy_enabled(ipconfig_ipv6);
1133
1134         g_dhcpv6_client_set_ia(dhcp_client, index,
1135                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
1136                         NULL, NULL, FALSE);
1137
1138         clear_callbacks(dhcp_client);
1139
1140         g_dhcp_client_register_event(dhcp_client,
1141                                 G_DHCP_CLIENT_EVENT_SOLICITATION,
1142                                 solicitation_cb, dhcp);
1143
1144         g_dhcp_client_register_event(dhcp_client,
1145                                 G_DHCP_CLIENT_EVENT_ADVERTISE,
1146                                 advertise_cb, dhcp);
1147
1148         dhcp->dhcp_client = dhcp_client;
1149
1150         return g_dhcp_client_start(dhcp_client, NULL);
1151 }
1152
1153 static gboolean start_solicitation(gpointer user_data)
1154 {
1155         struct connman_dhcpv6 *dhcp = user_data;
1156
1157         /* Set the retransmission timeout, RFC 3315 chapter 14 */
1158         dhcp->RT = SOL_TIMEOUT * (1 + get_random());
1159
1160         DBG("solicit initial RT timeout %d msec", dhcp->RT);
1161
1162         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1163
1164         dhcpv6_solicitation(dhcp);
1165
1166         return FALSE;
1167 }
1168
1169 int __connman_dhcpv6_start(struct connman_network *network,
1170                                 GSList *prefixes, dhcp_cb callback)
1171 {
1172         struct connman_dhcpv6 *dhcp;
1173         int delay;
1174
1175         DBG("");
1176
1177         if (network_table != NULL) {
1178                 dhcp = g_hash_table_lookup(network_table, network);
1179                 if (dhcp != NULL && dhcp->started == TRUE)
1180                         return -EBUSY;
1181         }
1182
1183         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1184         if (dhcp == NULL)
1185                 return -ENOMEM;
1186
1187         dhcp->network = network;
1188         dhcp->callback = callback;
1189         dhcp->prefixes = prefixes;
1190         dhcp->started = TRUE;
1191
1192         connman_network_ref(network);
1193
1194         DBG("replace network %p dhcp %p", network, dhcp);
1195
1196         g_hash_table_replace(network_table, network, dhcp);
1197
1198         /* Initial timeout, RFC 3315, 17.1.2 */
1199         delay = rand() % 1000;
1200
1201         dhcp->timeout = g_timeout_add(delay, start_solicitation, dhcp);
1202
1203         return 0;
1204 }
1205
1206 void __connman_dhcpv6_stop(struct connman_network *network)
1207 {
1208         DBG("");
1209
1210         if (network_table == NULL)
1211                 return;
1212
1213         if (g_hash_table_remove(network_table, network) == TRUE)
1214                 connman_network_unref(network);
1215 }
1216
1217 int __connman_dhcpv6_init(void)
1218 {
1219         DBG("");
1220
1221         srand(time(NULL));
1222
1223         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
1224                                                         NULL, remove_network);
1225
1226         return 0;
1227 }
1228
1229 void __connman_dhcpv6_cleanup(void)
1230 {
1231         DBG("");
1232
1233         g_hash_table_destroy(network_table);
1234         network_table = NULL;
1235 }