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 != NULL &&
 475                                         dhcp->nameservers[i] != NULL; i++)
 476                         __connman_service_nameserver_append(service,
 477                                                         dhcp->nameservers[i],
 478                                                         FALSE);
 479         } else
 480                 g_strfreev(nameservers);
 481
 482
 483         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 484         entries = g_list_length(option);
 485
 486         timeservers = g_try_new0(char *, entries + 1);
 487         if (timeservers != NULL) {
 488                 for (i = 0, list = option; list; list = list->next, i++)
 489                         timeservers[i] = g_strdup(list->data);
 490         }
 491
 492         if (compare_string_arrays(timeservers, dhcp->timeservers) == FALSE) {
 493                 if (dhcp->timeservers != NULL) {
 494                         for (i = 0; dhcp->timeservers[i] != NULL; i++)
 495                                 __connman_service_timeserver_remove(service,
 496                                                         dhcp->timeservers[i]);
 497                         g_strfreev(dhcp->timeservers);
 498                 }
 499
 500                 dhcp->timeservers = timeservers;
 501
 502                 for (i = 0; dhcp->timeservers != NULL &&
 503                                         dhcp->timeservers[i] != NULL; i++)
 504                         __connman_service_timeserver_append(service,
 505                                                         dhcp->timeservers[i]);
 506         } else
 507                 g_strfreev(timeservers);
 508
 509
 510         option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_NA);
 511         if (option != NULL)
 512                 address = g_strdup(option->data);
 513         else {
 514                 option = g_dhcp_client_get_option(dhcp_client, G_DHCPV6_IA_TA);
 515                 if (option != NULL)
 516                         address = g_strdup(option->data);
 517         }
 518
 519         c_address = __connman_ipconfig_get_local(ipconfig);
 520
 521         if (address != NULL &&
 522                         ((c_address != NULL &&
 523                                 g_strcmp0(address, c_address) != 0) ||
 524                         (c_address == NULL))) {
 525                 int prefix_len;
 526
 527                 /* Is this prefix part of the subnet we are suppose to use? */
 528                 prefix_len = check_ipv6_addr_prefix(dhcp->prefixes, address);
 529
 530                 __connman_ipconfig_set_local(ipconfig, address);
 531                 __connman_ipconfig_set_prefixlen(ipconfig, prefix_len);
 532
 533                 DBG("new address %s/%d", address, prefix_len);
 534         }
 535
 536         return 0;
 537 }
 538
 539 static void re_cb(GDHCPClient *dhcp_client, gpointer user_data)
 540 {
 541         struct connman_dhcpv6 *dhcp = user_data;
 542         uint16_t status;
 543         int ret;
 544
 545         ret = set_addresses(dhcp_client, dhcp);
 546
 547         status = g_dhcpv6_client_get_status(dhcp_client);
 548
 549         DBG("dhcpv6 cb msg %p ret %d status %d", dhcp, ret, status);
 550
 551         if (ret < 0) {
 552                 if (dhcp->callback != NULL)
 553                         dhcp->callback(dhcp->network, FALSE);
 554                 return;
 555         }
 556
 557         if (status  == G_DHCPV6_ERROR_BINDING) {
 558                 /* RFC 3315, 18.1.8 */
 559                 dhcpv6_request(dhcp, FALSE);
 560         } else {
 561                 if (dhcp->callback != NULL)
 562                         dhcp->callback(dhcp->network,
 563                                                 status == 0 ? TRUE : FALSE);
 564         }
 565 }
 566
 567 static void rebind_cb(GDHCPClient *dhcp_client, gpointer user_data)
 568 {
 569         DBG("");
 570
 571         g_dhcpv6_client_reset_rebind(dhcp_client);
 572         g_dhcpv6_client_reset_renew(dhcp_client);
 573
 574         re_cb(dhcp_client, user_data);
 575 }
 576
 577 static int dhcpv6_rebind(struct connman_dhcpv6 *dhcp)
 578 {
 579         GDHCPClient *dhcp_client;
 580
 581         DBG("dhcp %p", dhcp);
 582
 583         dhcp_client = dhcp->dhcp_client;
 584
 585         g_dhcp_client_clear_requests(dhcp_client);
 586
 587         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 588         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 589         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 590
 591         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 592                                 G_DHCPV6_SNTP_SERVERS);
 593
 594         g_dhcpv6_client_set_ia(dhcp_client,
 595                         connman_network_get_index(dhcp->network),
 596                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 597                         NULL, NULL, FALSE);
 598
 599         clear_callbacks(dhcp_client);
 600
 601         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REBIND,
 602                                         rebind_cb, dhcp);
 603
 604         dhcp->dhcp_client = dhcp_client;
 605
 606         return g_dhcp_client_start(dhcp_client, NULL);
 607 }
 608
 609 static gboolean dhcpv6_restart(gpointer user_data)
 610 {
 611         struct connman_dhcpv6 *dhcp = user_data;
 612
 613         if (dhcp->callback != NULL)
 614                 dhcp->callback(dhcp->network, FALSE);
 615
 616         return FALSE;
 617 }
 618
 619 /*
 620  * Check if we need to restart the solicitation procedure. This
 621  * is done if all the addresses have expired. RFC 3315, 18.1.4
 622  */
 623 static int check_restart(struct connman_dhcpv6 *dhcp)
 624 {
 625         time_t current, expired;
 626
 627         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, NULL, NULL,
 628                                 NULL, NULL, &expired);
 629         current = time(NULL);
 630
 631         if (current > expired) {
 632                 DBG("expired by %d secs", (int)(current - expired));
 633
 634                 g_timeout_add(0, dhcpv6_restart, dhcp);
 635
 636                 return -ETIMEDOUT;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static gboolean timeout_rebind(gpointer user_data)
 643 {
 644         struct connman_dhcpv6 *dhcp = user_data;
 645
 646         if (check_restart(dhcp) < 0)
 647                 return FALSE;
 648
 649         dhcp->RT = calc_delay(dhcp->RT, REB_MAX_RT);
 650
 651         DBG("rebind RT timeout %d msec", dhcp->RT);
 652
 653         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 654
 655         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 656
 657         return FALSE;
 658 }
 659
 660 static gboolean start_rebind(gpointer user_data)
 661 {
 662         struct connman_dhcpv6 *dhcp = user_data;
 663
 664         dhcp->RT = REB_TIMEOUT * (1 + get_random());
 665
 666         DBG("rebind initial RT timeout %d msec", dhcp->RT);
 667
 668         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_rebind, dhcp);
 669
 670         dhcpv6_rebind(dhcp);
 671
 672         return FALSE;
 673 }
 674
 675 static void request_cb(GDHCPClient *dhcp_client, gpointer user_data)
 676 {
 677         DBG("");
 678
 679         re_cb(dhcp_client, user_data);
 680 }
 681
 682 static int dhcpv6_request(struct connman_dhcpv6 *dhcp,
 683                         gboolean add_addresses)
 684 {
 685         GDHCPClient *dhcp_client;
 686         uint32_t T1, T2;
 687
 688         DBG("dhcp %p add %d", dhcp, add_addresses);
 689
 690         dhcp_client = dhcp->dhcp_client;
 691
 692         g_dhcp_client_clear_requests(dhcp_client);
 693
 694         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 695         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 696         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 697         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 698
 699         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 700                                 G_DHCPV6_SNTP_SERVERS);
 701
 702         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 703         g_dhcpv6_client_set_ia(dhcp_client,
 704                         connman_network_get_index(dhcp->network),
 705                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 706                         &T1, &T2, add_addresses);
 707
 708         clear_callbacks(dhcp_client);
 709
 710         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_REQUEST,
 711                                         request_cb, dhcp);
 712
 713         dhcp->dhcp_client = dhcp_client;
 714
 715         return g_dhcp_client_start(dhcp_client, NULL);
 716 }
 717
 718 static gboolean timeout_request(gpointer user_data)
 719 {
 720         struct connman_dhcpv6 *dhcp = user_data;
 721
 722         if (dhcp->request_count >= REQ_MAX_RC) {
 723                 DBG("max request retry attempts %d", dhcp->request_count);
 724                 dhcp->request_count = 0;
 725                 if (dhcp->callback != NULL)
 726                         dhcp->callback(dhcp->network, FALSE);
 727                 return FALSE;
 728         }
 729
 730         dhcp->request_count++;
 731
 732         dhcp->RT = calc_delay(dhcp->RT, REQ_MAX_RT);
 733         DBG("request RT timeout %d msec", dhcp->RT);
 734         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
 735
 736         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 737
 738         return FALSE;
 739 }
 740
 741 static void renew_cb(GDHCPClient *dhcp_client, gpointer user_data)
 742 {
 743         DBG("");
 744
 745         g_dhcpv6_client_reset_renew(dhcp_client);
 746
 747         re_cb(dhcp_client, user_data);
 748 }
 749
 750 static int dhcpv6_renew(struct connman_dhcpv6 *dhcp)
 751 {
 752         GDHCPClient *dhcp_client;
 753         uint32_t T1, T2;
 754
 755         DBG("dhcp %p", dhcp);
 756
 757         dhcp_client = dhcp->dhcp_client;
 758
 759         g_dhcp_client_clear_requests(dhcp_client);
 760
 761         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 762         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 763         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
 764         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
 765
 766         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
 767                                 G_DHCPV6_SNTP_SERVERS);
 768
 769         g_dhcpv6_client_get_timeouts(dhcp_client, &T1, &T2, NULL, NULL, NULL);
 770         g_dhcpv6_client_set_ia(dhcp_client,
 771                         connman_network_get_index(dhcp->network),
 772                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 773                         &T1, &T2, TRUE);
 774
 775         clear_callbacks(dhcp_client);
 776
 777         g_dhcp_client_register_event(dhcp_client, G_DHCP_CLIENT_EVENT_RENEW,
 778                                         renew_cb, dhcp);
 779
 780         dhcp->dhcp_client = dhcp_client;
 781
 782         return g_dhcp_client_start(dhcp_client, NULL);
 783 }
 784
 785 static gboolean timeout_renew(gpointer user_data)
 786 {
 787         struct connman_dhcpv6 *dhcp = user_data;
 788
 789         if (check_restart(dhcp) < 0)
 790                 return FALSE;
 791
 792         dhcp->RT = calc_delay(dhcp->RT, REN_MAX_RT);
 793
 794         DBG("renew RT timeout %d msec", dhcp->RT);
 795
 796         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 797
 798         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 799
 800         return FALSE;
 801 }
 802
 803 static gboolean start_renew(gpointer user_data)
 804 {
 805         struct connman_dhcpv6 *dhcp = user_data;
 806
 807         dhcp->RT = REN_TIMEOUT * (1 + get_random());
 808
 809         DBG("renew initial RT timeout %d msec", dhcp->RT);
 810
 811         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_renew, dhcp);
 812
 813         dhcpv6_renew(dhcp);
 814
 815         return FALSE;
 816 }
 817
 818 int __connman_dhcpv6_start_renew(struct connman_network *network,
 819                                                         dhcp_cb callback)
 820 {
 821         struct connman_dhcpv6 *dhcp;
 822         uint32_t T1, T2;
 823         time_t last_renew, last_rebind, current, expired;
 824
 825         dhcp = g_hash_table_lookup(network_table, network);
 826         if (dhcp == NULL)
 827                 return -ENOENT;
 828
 829         DBG("network %p dhcp %p", network, dhcp);
 830
 831         clear_timer(dhcp);
 832
 833         g_dhcpv6_client_get_timeouts(dhcp->dhcp_client, &T1, &T2,
 834                                 &last_renew, &last_rebind, &expired);
 835
 836         current = time(NULL);
 837
 838         DBG("T1 %u T2 %u expires %lu current %lu", T1, T2,
 839                 (unsigned long)expired, current);
 840
 841         if (T1 == 0xffffffff)
 842                 /* RFC 3315, 22.4 */
 843                 return 0;
 844
 845         if (T1 == 0)
 846                 /* RFC 3315, 22.4
 847                  * Client can choose the timeout.
 848                  */
 849                 T1 = 1800;
 850
 851         /* RFC 3315, 18.1.4, start solicit if expired */
 852         if (current > expired) {
 853                 DBG("expired by %d secs", (int)(current - expired));
 854                 return -ETIMEDOUT;
 855         }
 856
 857         dhcp->callback = callback;
 858
 859         if (T2 != 0xffffffff && T2 > 0 &&
 860                         (unsigned)current > (unsigned)last_rebind + T2) {
 861                 int timeout;
 862
 863                 /* RFC 3315, chapter 18.1.3, start rebind */
 864                 if ((unsigned)current > (unsigned)last_renew + T1)
 865                         timeout = 0;
 866                 else
 867                         timeout = last_renew - current + T1;
 868
 869                 /*
 870                  * If we just did a renew, do not restart the rebind
 871                  * immediately.
 872                  */
 873                 dhcp->timeout = g_timeout_add_seconds(timeout, start_rebind,
 874                                                 dhcp);
 875         } else {
 876                 DBG("renew after %d secs", T1);
 877
 878                 dhcp->timeout = g_timeout_add_seconds(T1, start_renew, dhcp);
 879         }
 880         return 0;
 881 }
 882
 883 int __connman_dhcpv6_start_release(struct connman_network *network,
 884                                 dhcp_cb callback)
 885 {
 886         struct connman_dhcpv6 *dhcp;
 887         GDHCPClient *dhcp_client;
 888
 889         if (network_table == NULL)
 890                 return 0;   /* we are already released */
 891
 892         dhcp = g_hash_table_lookup(network_table, network);
 893         if (dhcp == NULL)
 894                 return -ENOENT;
 895
 896         DBG("network %p dhcp %p client %p stateless %d", network, dhcp,
 897                                         dhcp->dhcp_client, dhcp->stateless);
 898
 899         if (dhcp->stateless == TRUE)
 900                 return -EINVAL;
 901
 902         clear_timer(dhcp);
 903
 904         dhcp_client = dhcp->dhcp_client;
 905         if (dhcp_client == NULL) {
 906                 /*
 907                  * We had started the DHCPv6 handshaking i.e., we have called
 908                  * __connman_dhcpv6_start() but it has not yet sent
 909                  * a solicitation message to server. This means that we do not
 910                  * have DHCPv6 configured yet so we can just quit here.
 911                  */
 912                 DBG("DHCPv6 was not started");
 913                 return 0;
 914         }
 915
 916         g_dhcp_client_clear_requests(dhcp_client);
 917         g_dhcp_client_clear_values(dhcp_client);
 918
 919         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
 920         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SERVERID);
 921
 922         g_dhcpv6_client_set_ia(dhcp_client,
 923                         connman_network_get_index(dhcp->network),
 924                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
 925                         NULL, NULL, TRUE);
 926
 927         clear_callbacks(dhcp_client);
 928
 929         /*
 930          * We do not register callback here because the answer might take too
 931          * long time and network code might be in the middle of the disconnect.
 932          * So we just inform the server that we are done with the addresses
 933          * but ignore the reply from server. This is allowed by RFC 3315
 934          * chapter 18.1.6.
 935          */
 936
 937         dhcp->dhcp_client = dhcp_client;
 938
 939         return g_dhcp_client_start(dhcp_client, NULL);
 940 }
 941
 942 static int dhcpv6_release(struct connman_dhcpv6 *dhcp)
 943 {
 944         DBG("dhcp %p", dhcp);
 945
 946         clear_timer(dhcp);
 947
 948         dhcpv6_free(dhcp);
 949
 950         if (dhcp->dhcp_client == NULL)
 951                 return 0;
 952
 953         g_dhcp_client_stop(dhcp->dhcp_client);
 954         g_dhcp_client_unref(dhcp->dhcp_client);
 955
 956         dhcp->dhcp_client = NULL;
 957
 958         return 0;
 959 }
 960
 961 static void remove_network(gpointer user_data)
 962 {
 963         struct connman_dhcpv6 *dhcp = user_data;
 964
 965         DBG("dhcp %p", dhcp);
 966
 967         dhcpv6_release(dhcp);
 968
 969         g_free(dhcp);
 970 }
 971
 972 static gboolean timeout_info_req(gpointer user_data)
 973 {
 974         struct connman_dhcpv6 *dhcp = user_data;
 975
 976         dhcp->RT = calc_delay(dhcp->RT, INF_MAX_RT);
 977
 978         DBG("info RT timeout %d msec", dhcp->RT);
 979
 980         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 981
 982         g_dhcp_client_start(dhcp->dhcp_client, NULL);
 983
 984         return FALSE;
 985 }
 986
 987 static gboolean start_info_req(gpointer user_data)
 988 {
 989         struct connman_dhcpv6 *dhcp = user_data;
 990
 991         /* Set the retransmission timeout, RFC 3315 chapter 14 */
 992         dhcp->RT = INF_TIMEOUT * (1 + get_random());
 993
 994         DBG("info initial RT timeout %d msec", dhcp->RT);
 995
 996         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_info_req, dhcp);
 997
 998         dhcpv6_info_request(dhcp);
 999
1000         return FALSE;
1001 }
1002
1003 int __connman_dhcpv6_start_info(struct connman_network *network,
1004                                 dhcp_cb callback)
1005 {
1006         struct connman_dhcpv6 *dhcp;
1007         int delay;
1008
1009         DBG("");
1010
1011         if (network_table != NULL) {
1012                 dhcp = g_hash_table_lookup(network_table, network);
1013                 if (dhcp != NULL && dhcp->started == TRUE)
1014                         return -EBUSY;
1015         }
1016
1017         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1018         if (dhcp == NULL)
1019                 return -ENOMEM;
1020
1021         dhcp->network = network;
1022         dhcp->callback = callback;
1023         dhcp->stateless = TRUE;
1024         dhcp->started = TRUE;
1025
1026         connman_network_ref(network);
1027
1028         DBG("replace network %p dhcp %p", network, dhcp);
1029
1030         g_hash_table_replace(network_table, network, dhcp);
1031
1032         /* Initial timeout, RFC 3315, 18.1.5 */
1033         delay = rand() % 1000;
1034
1035         dhcp->timeout = g_timeout_add(delay, start_info_req, dhcp);
1036
1037         return 0;
1038 }
1039
1040 static void advertise_cb(GDHCPClient *dhcp_client, gpointer user_data)
1041 {
1042         struct connman_dhcpv6 *dhcp = user_data;
1043
1044         DBG("dhcpv6 advertise msg %p", dhcp);
1045
1046         clear_timer(dhcp);
1047
1048         if (g_dhcpv6_client_get_status(dhcp_client) != 0) {
1049                 if (dhcp->callback != NULL)
1050                         dhcp->callback(dhcp->network, FALSE);
1051                 return;
1052         }
1053
1054         dhcp->RT = REQ_TIMEOUT * (1 + get_random());
1055         DBG("request initial RT timeout %d msec", dhcp->RT);
1056         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_request, dhcp);
1057
1058         dhcp->request_count = 1;
1059
1060         dhcpv6_request(dhcp, TRUE);
1061 }
1062
1063 static void solicitation_cb(GDHCPClient *dhcp_client, gpointer user_data)
1064 {
1065         /* We get here if server supports rapid commit */
1066         struct connman_dhcpv6 *dhcp = user_data;
1067
1068         DBG("dhcpv6 solicitation msg %p", dhcp);
1069
1070         clear_timer(dhcp);
1071
1072         set_addresses(dhcp_client, dhcp);
1073 }
1074
1075 static gboolean timeout_solicitation(gpointer user_data)
1076 {
1077         struct connman_dhcpv6 *dhcp = user_data;
1078
1079         dhcp->RT = calc_delay(dhcp->RT, SOL_MAX_RT);
1080
1081         DBG("solicit RT timeout %d msec", dhcp->RT);
1082
1083         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1084
1085         g_dhcp_client_start(dhcp->dhcp_client, NULL);
1086
1087         return FALSE;
1088 }
1089
1090 static int dhcpv6_solicitation(struct connman_dhcpv6 *dhcp)
1091 {
1092         struct connman_service *service;
1093         struct connman_ipconfig *ipconfig_ipv6;
1094         GDHCPClient *dhcp_client;
1095         GDHCPClientError error;
1096         int index, ret;
1097
1098         DBG("dhcp %p", dhcp);
1099
1100         index = connman_network_get_index(dhcp->network);
1101
1102         dhcp_client = g_dhcp_client_new(G_DHCP_IPV6, index, &error);
1103         if (error != G_DHCP_CLIENT_ERROR_NONE) {
1104                 clear_timer(dhcp);
1105                 return -EINVAL;
1106         }
1107
1108         if (getenv("CONNMAN_DHCPV6_DEBUG"))
1109                 g_dhcp_client_set_debug(dhcp_client, dhcpv6_debug, "DHCPv6");
1110
1111         service = connman_service_lookup_from_network(dhcp->network);
1112         if (service == NULL) {
1113                 clear_timer(dhcp);
1114                 g_dhcp_client_unref(dhcp_client);
1115                 return -EINVAL;
1116         }
1117
1118         ret = set_duid(service, dhcp->network, dhcp_client, index);
1119         if (ret < 0) {
1120                 clear_timer(dhcp);
1121                 g_dhcp_client_unref(dhcp_client);
1122                 return ret;
1123         }
1124
1125         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_CLIENTID);
1126         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_RAPID_COMMIT);
1127         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_DNS_SERVERS);
1128         g_dhcp_client_set_request(dhcp_client, G_DHCPV6_SNTP_SERVERS);
1129
1130         g_dhcpv6_client_set_oro(dhcp_client, 2, G_DHCPV6_DNS_SERVERS,
1131                                 G_DHCPV6_SNTP_SERVERS);
1132
1133         ipconfig_ipv6 = __connman_service_get_ip6config(service);
1134         dhcp->use_ta = __connman_ipconfig_ipv6_privacy_enabled(ipconfig_ipv6);
1135
1136         g_dhcpv6_client_set_ia(dhcp_client, index,
1137                         dhcp->use_ta == TRUE ? G_DHCPV6_IA_TA : G_DHCPV6_IA_NA,
1138                         NULL, NULL, FALSE);
1139
1140         clear_callbacks(dhcp_client);
1141
1142         g_dhcp_client_register_event(dhcp_client,
1143                                 G_DHCP_CLIENT_EVENT_SOLICITATION,
1144                                 solicitation_cb, dhcp);
1145
1146         g_dhcp_client_register_event(dhcp_client,
1147                                 G_DHCP_CLIENT_EVENT_ADVERTISE,
1148                                 advertise_cb, dhcp);
1149
1150         dhcp->dhcp_client = dhcp_client;
1151
1152         return g_dhcp_client_start(dhcp_client, NULL);
1153 }
1154
1155 static gboolean start_solicitation(gpointer user_data)
1156 {
1157         struct connman_dhcpv6 *dhcp = user_data;
1158
1159         /* Set the retransmission timeout, RFC 3315 chapter 14 */
1160         dhcp->RT = SOL_TIMEOUT * (1 + get_random());
1161
1162         DBG("solicit initial RT timeout %d msec", dhcp->RT);
1163
1164         dhcp->timeout = g_timeout_add(dhcp->RT, timeout_solicitation, dhcp);
1165
1166         dhcpv6_solicitation(dhcp);
1167
1168         return FALSE;
1169 }
1170
1171 int __connman_dhcpv6_start(struct connman_network *network,
1172                                 GSList *prefixes, dhcp_cb callback)
1173 {
1174         struct connman_dhcpv6 *dhcp;
1175         int delay;
1176
1177         DBG("");
1178
1179         if (network_table != NULL) {
1180                 dhcp = g_hash_table_lookup(network_table, network);
1181                 if (dhcp != NULL && dhcp->started == TRUE)
1182                         return -EBUSY;
1183         }
1184
1185         dhcp = g_try_new0(struct connman_dhcpv6, 1);
1186         if (dhcp == NULL)
1187                 return -ENOMEM;
1188
1189         dhcp->network = network;
1190         dhcp->callback = callback;
1191         dhcp->prefixes = prefixes;
1192         dhcp->started = TRUE;
1193
1194         connman_network_ref(network);
1195
1196         DBG("replace network %p dhcp %p", network, dhcp);
1197
1198         g_hash_table_replace(network_table, network, dhcp);
1199
1200         /* Initial timeout, RFC 3315, 17.1.2 */
1201         delay = rand() % 1000;
1202
1203         dhcp->timeout = g_timeout_add(delay, start_solicitation, dhcp);
1204
1205         return 0;
1206 }
1207
1208 void __connman_dhcpv6_stop(struct connman_network *network)
1209 {
1210         DBG("");
1211
1212         if (network_table == NULL)
1213                 return;
1214
1215         if (g_hash_table_remove(network_table, network) == TRUE)
1216                 connman_network_unref(network);
1217 }
1218
1219 int __connman_dhcpv6_init(void)
1220 {
1221         DBG("");
1222
1223         srand(time(NULL));
1224
1225         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
1226                                                         NULL, remove_network);
1227
1228         return 0;
1229 }
1230
1231 void __connman_dhcpv6_cleanup(void)
1232 {
1233         DBG("");
1234
1235         g_hash_table_destroy(network_table);
1236         network_table = NULL;
1237 }