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