vpn/vpn-rtnl.c

   1 /*
   2  *
   3  *  ConnMan VPN daemon
   4  *
   5  *  Copyright (C) 2012-2013  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
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <unistd.h>
  29 #include <string.h>
  30 #include <sys/socket.h>
  31 #include <sys/ioctl.h>
  32 #include <arpa/inet.h>
  33 #include <netinet/ether.h>
  34 #include <netinet/icmp6.h>
  35 #include <net/if_arp.h>
  36 #include <linux/if.h>
  37 #include <linux/netlink.h>
  38 #include <linux/rtnetlink.h>
  39 #include <linux/wireless.h>
  40
  41 #include <glib.h>
  42
  43 #include <connman/log.h>
  44
  45 #include "vpn.h"
  46
  47 #include "vpn-rtnl.h"
  48
  49 #ifndef ARPHDR_PHONET_PIPE
  50 #define ARPHDR_PHONET_PIPE (821)
  51 #endif
  52
  53 #define print(arg...) do { if (0) connman_info(arg); } while (0)
  54 #define debug(arg...) do { if (0) DBG(arg); } while (0)
  55
  56 struct watch_data {
  57         unsigned int id;
  58         int index;
  59         vpn_rtnl_link_cb_t newlink;
  60         void *user_data;
  61 };
  62
  63 static GSList *watch_list = NULL;
  64 static unsigned int watch_id = 0;
  65
  66 static GSList *update_list = NULL;
  67 static guint update_interval = G_MAXUINT;
  68 static guint update_timeout = 0;
  69
  70 struct interface_data {
  71         int index;
  72         char *ident;
  73 };
  74
  75 static GHashTable *interface_list = NULL;
  76
  77 static void free_interface(gpointer data)
  78 {
  79         struct interface_data *interface = data;
  80
  81         g_free(interface->ident);
  82         g_free(interface);
  83 }
  84
  85 /**
  86  * vpn_rtnl_add_newlink_watch:
  87  * @index: network device index
  88  * @callback: callback function
  89  * @user_data: callback data;
  90  *
  91  * Add a new RTNL watch for newlink events
  92  *
  93  * Returns: %0 on failure and a unique id on success
  94  */
  95 unsigned int vpn_rtnl_add_newlink_watch(int index,
  96                         vpn_rtnl_link_cb_t callback, void *user_data)
  97 {
  98         struct watch_data *watch;
  99
 100         watch = g_try_new0(struct watch_data, 1);
 101         if (!watch)
 102                 return 0;
 103
 104         watch->id = ++watch_id;
 105         watch->index = index;
 106
 107         watch->newlink = callback;
 108         watch->user_data = user_data;
 109
 110         watch_list = g_slist_prepend(watch_list, watch);
 111
 112         DBG("id %d", watch->id);
 113
 114         if (callback) {
 115                 unsigned int flags = __vpn_ipconfig_get_flags_from_index(index);
 116
 117                 if (flags > 0)
 118                         callback(flags, 0, user_data);
 119         }
 120
 121         return watch->id;
 122 }
 123
 124 /**
 125  * vpn_rtnl_remove_watch:
 126  * @id: watch identifier
 127  *
 128  * Remove the RTNL watch for the identifier
 129  */
 130 void vpn_rtnl_remove_watch(unsigned int id)
 131 {
 132         GSList *list;
 133
 134         DBG("id %d", id);
 135
 136         if (id == 0)
 137                 return;
 138
 139         for (list = watch_list; list; list = list->next) {
 140                 struct watch_data *watch = list->data;
 141
 142                 if (watch->id  == id) {
 143                         watch_list = g_slist_remove(watch_list, watch);
 144                         g_free(watch);
 145                         break;
 146                 }
 147         }
 148 }
 149
 150 static void trigger_rtnl(int index, void *user_data)
 151 {
 152         struct vpn_rtnl *rtnl = user_data;
 153
 154         if (rtnl->newlink) {
 155                 unsigned short type = __vpn_ipconfig_get_type_from_index(index);
 156                 unsigned int flags = __vpn_ipconfig_get_flags_from_index(index);
 157
 158                 rtnl->newlink(type, index, flags, 0);
 159         }
 160 }
 161
 162 static GSList *rtnl_list = NULL;
 163
 164 static gint compare_priority(gconstpointer a, gconstpointer b)
 165 {
 166         const struct vpn_rtnl *rtnl1 = a;
 167         const struct vpn_rtnl *rtnl2 = b;
 168
 169         return rtnl2->priority - rtnl1->priority;
 170 }
 171
 172 /**
 173  * vpn_rtnl_register:
 174  * @rtnl: RTNL module
 175  *
 176  * Register a new RTNL module
 177  *
 178  * Returns: %0 on success
 179  */
 180 int vpn_rtnl_register(struct vpn_rtnl *rtnl)
 181 {
 182         DBG("rtnl %p name %s", rtnl, rtnl->name);
 183
 184         rtnl_list = g_slist_insert_sorted(rtnl_list, rtnl,
 185                                                         compare_priority);
 186
 187         vpn_ipconfig_foreach(trigger_rtnl, rtnl);
 188
 189         return 0;
 190 }
 191
 192 /**
 193  * vpn_rtnl_unregister:
 194  * @rtnl: RTNL module
 195  *
 196  * Remove a previously registered RTNL module
 197  */
 198 void vpn_rtnl_unregister(struct vpn_rtnl *rtnl)
 199 {
 200         DBG("rtnl %p name %s", rtnl, rtnl->name);
 201
 202         rtnl_list = g_slist_remove(rtnl_list, rtnl);
 203 }
 204
 205 static const char *operstate2str(unsigned char operstate)
 206 {
 207         switch (operstate) {
 208         case IF_OPER_UNKNOWN:
 209                 return "UNKNOWN";
 210         case IF_OPER_NOTPRESENT:
 211                 return "NOT-PRESENT";
 212         case IF_OPER_DOWN:
 213                 return "DOWN";
 214         case IF_OPER_LOWERLAYERDOWN:
 215                 return "LOWER-LAYER-DOWN";
 216         case IF_OPER_TESTING:
 217                 return "TESTING";
 218         case IF_OPER_DORMANT:
 219                 return "DORMANT";
 220         case IF_OPER_UP:
 221                 return "UP";
 222         }
 223
 224         return "";
 225 }
 226
 227 static void extract_link(struct ifinfomsg *msg, int bytes,
 228                                 struct ether_addr *address, const char **ifname,
 229                                 unsigned int *mtu, unsigned char *operstate,
 230                                                 struct rtnl_link_stats *stats)
 231 {
 232         struct rtattr *attr;
 233
 234         for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
 235                                         attr = RTA_NEXT(attr, bytes)) {
 236                 switch (attr->rta_type) {
 237                 case IFLA_ADDRESS:
 238                         if (address)
 239                                 memcpy(address, RTA_DATA(attr), ETH_ALEN);
 240                         break;
 241                 case IFLA_IFNAME:
 242                         if (ifname)
 243                                 *ifname = RTA_DATA(attr);
 244                         break;
 245                 case IFLA_MTU:
 246                         if (mtu)
 247                                 *mtu = *((unsigned int *) RTA_DATA(attr));
 248                         break;
 249                 case IFLA_STATS:
 250                         if (stats)
 251                                 memcpy(stats, RTA_DATA(attr),
 252                                         sizeof(struct rtnl_link_stats));
 253                         break;
 254                 case IFLA_OPERSTATE:
 255                         if (operstate)
 256                                 *operstate = *((unsigned char *) RTA_DATA(attr));
 257                         break;
 258                 case IFLA_LINKMODE:
 259                         break;
 260                 }
 261         }
 262 }
 263
 264 static void process_newlink(unsigned short type, int index, unsigned flags,
 265                         unsigned change, struct ifinfomsg *msg, int bytes)
 266 {
 267         struct ether_addr address = {{ 0, 0, 0, 0, 0, 0 }};
 268         struct ether_addr compare = {{ 0, 0, 0, 0, 0, 0 }};
 269         struct rtnl_link_stats stats;
 270         unsigned char operstate = 0xff;
 271         struct interface_data *interface;
 272         const char *ifname = NULL;
 273         unsigned int mtu = 0;
 274         char ident[13], str[18];
 275         GSList *list;
 276
 277         memset(&stats, 0, sizeof(stats));
 278         extract_link(msg, bytes, &address, &ifname, &mtu, &operstate, &stats);
 279
 280         snprintf(ident, 13, "%02x%02x%02x%02x%02x%02x",
 281                                                 address.ether_addr_octet[0],
 282                                                 address.ether_addr_octet[1],
 283                                                 address.ether_addr_octet[2],
 284                                                 address.ether_addr_octet[3],
 285                                                 address.ether_addr_octet[4],
 286                                                 address.ether_addr_octet[5]);
 287
 288         snprintf(str, 18, "%02X:%02X:%02X:%02X:%02X:%02X",
 289                                                 address.ether_addr_octet[0],
 290                                                 address.ether_addr_octet[1],
 291                                                 address.ether_addr_octet[2],
 292                                                 address.ether_addr_octet[3],
 293                                                 address.ether_addr_octet[4],
 294                                                 address.ether_addr_octet[5]);
 295
 296         switch (type) {
 297         case ARPHRD_ETHER:
 298         case ARPHRD_LOOPBACK:
 299         case ARPHDR_PHONET_PIPE:
 300         case ARPHRD_NONE:
 301                 __vpn_ipconfig_newlink(index, type, flags,
 302                                                         str, mtu, &stats);
 303                 break;
 304         }
 305
 306         if (memcmp(&address, &compare, ETH_ALEN) != 0)
 307                 connman_info("%s {newlink} index %d address %s mtu %u",
 308                                                 ifname, index, str, mtu);
 309
 310         if (operstate != 0xff)
 311                 connman_info("%s {newlink} index %d operstate %u <%s>",
 312                                                 ifname, index, operstate,
 313                                                 operstate2str(operstate));
 314
 315         interface = g_hash_table_lookup(interface_list, GINT_TO_POINTER(index));
 316         if (!interface) {
 317                 interface = g_new0(struct interface_data, 1);
 318                 interface->index = index;
 319                 interface->ident = g_strdup(ident);
 320
 321                 g_hash_table_insert(interface_list,
 322                                         GINT_TO_POINTER(index), interface);
 323         }
 324
 325         for (list = rtnl_list; list; list = list->next) {
 326                 struct vpn_rtnl *rtnl = list->data;
 327
 328                 if (rtnl->newlink)
 329                         rtnl->newlink(type, index, flags, change);
 330         }
 331
 332         for (list = watch_list; list; list = list->next) {
 333                 struct watch_data *watch = list->data;
 334
 335                 if (watch->index != index)
 336                         continue;
 337
 338                 if (watch->newlink)
 339                         watch->newlink(flags, change, watch->user_data);
 340         }
 341 }
 342
 343 static void process_dellink(unsigned short type, int index, unsigned flags,
 344                         unsigned change, struct ifinfomsg *msg, int bytes)
 345 {
 346         struct rtnl_link_stats stats;
 347         unsigned char operstate = 0xff;
 348         const char *ifname = NULL;
 349         GSList *list;
 350
 351         memset(&stats, 0, sizeof(stats));
 352         extract_link(msg, bytes, NULL, &ifname, NULL, &operstate, &stats);
 353
 354         if (operstate != 0xff)
 355                 connman_info("%s {dellink} index %d operstate %u <%s>",
 356                                                 ifname, index, operstate,
 357                                                 operstate2str(operstate));
 358
 359         for (list = rtnl_list; list; list = list->next) {
 360                 struct vpn_rtnl *rtnl = list->data;
 361
 362                 if (rtnl->dellink)
 363                         rtnl->dellink(type, index, flags, change);
 364         }
 365
 366         switch (type) {
 367         case ARPHRD_ETHER:
 368         case ARPHRD_LOOPBACK:
 369         case ARPHRD_NONE:
 370                 __vpn_ipconfig_dellink(index, &stats);
 371                 break;
 372         }
 373
 374         g_hash_table_remove(interface_list, GINT_TO_POINTER(index));
 375 }
 376
 377 static void extract_ipv4_route(struct rtmsg *msg, int bytes, int *index,
 378                                                 struct in_addr *dst,
 379                                                 struct in_addr *gateway)
 380 {
 381         struct rtattr *attr;
 382
 383         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 384                                         attr = RTA_NEXT(attr, bytes)) {
 385                 switch (attr->rta_type) {
 386                 case RTA_DST:
 387                         if (dst)
 388                                 *dst = *((struct in_addr *) RTA_DATA(attr));
 389                         break;
 390                 case RTA_GATEWAY:
 391                         if (gateway)
 392                                 *gateway = *((struct in_addr *) RTA_DATA(attr));
 393                         break;
 394                 case RTA_OIF:
 395                         if (index)
 396                                 *index = *((int *) RTA_DATA(attr));
 397                         break;
 398                 }
 399         }
 400 }
 401
 402 static void extract_ipv6_route(struct rtmsg *msg, int bytes, int *index,
 403                                                 struct in6_addr *dst,
 404                                                 struct in6_addr *gateway)
 405 {
 406         struct rtattr *attr;
 407
 408         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 409                                         attr = RTA_NEXT(attr, bytes)) {
 410                 switch (attr->rta_type) {
 411                 case RTA_DST:
 412                         if (dst)
 413                                 *dst = *((struct in6_addr *) RTA_DATA(attr));
 414                         break;
 415                 case RTA_GATEWAY:
 416                         if (gateway)
 417                                 *gateway =
 418                                         *((struct in6_addr *) RTA_DATA(attr));
 419                         break;
 420                 case RTA_OIF:
 421                         if (index)
 422                                 *index = *((int *) RTA_DATA(attr));
 423                         break;
 424                 }
 425         }
 426 }
 427
 428 static void process_newroute(unsigned char family, unsigned char scope,
 429                                                 struct rtmsg *msg, int bytes)
 430 {
 431         GSList *list;
 432         char dststr[INET6_ADDRSTRLEN], gatewaystr[INET6_ADDRSTRLEN];
 433         int index = -1;
 434
 435         if (family == AF_INET) {
 436                 struct in_addr dst = { INADDR_ANY }, gateway = { INADDR_ANY };
 437
 438                 extract_ipv4_route(msg, bytes, &index, &dst, &gateway);
 439
 440                 inet_ntop(family, &dst, dststr, sizeof(dststr));
 441                 inet_ntop(family, &gateway, gatewaystr, sizeof(gatewaystr));
 442
 443                 /* skip host specific routes */
 444                 if (scope != RT_SCOPE_UNIVERSE &&
 445                         !(scope == RT_SCOPE_LINK && dst.s_addr == INADDR_ANY))
 446                         return;
 447
 448                 if (dst.s_addr != INADDR_ANY)
 449                         return;
 450
 451         } else if (family == AF_INET6) {
 452                 struct in6_addr dst = IN6ADDR_ANY_INIT,
 453                                 gateway = IN6ADDR_ANY_INIT;
 454
 455                 extract_ipv6_route(msg, bytes, &index, &dst, &gateway);
 456
 457                 inet_ntop(family, &dst, dststr, sizeof(dststr));
 458                 inet_ntop(family, &gateway, gatewaystr, sizeof(gatewaystr));
 459
 460                 /* skip host specific routes */
 461                 if (scope != RT_SCOPE_UNIVERSE &&
 462                         !(scope == RT_SCOPE_LINK &&
 463                                 IN6_IS_ADDR_UNSPECIFIED(&dst)))
 464                         return;
 465
 466                 if (!IN6_IS_ADDR_UNSPECIFIED(&dst))
 467                         return;
 468         } else
 469                 return;
 470
 471         for (list = rtnl_list; list; list = list->next) {
 472                 struct vpn_rtnl *rtnl = list->data;
 473
 474                 if (rtnl->newgateway)
 475                         rtnl->newgateway(index, gatewaystr);
 476         }
 477 }
 478
 479 static void process_delroute(unsigned char family, unsigned char scope,
 480                                                 struct rtmsg *msg, int bytes)
 481 {
 482         GSList *list;
 483         char dststr[INET6_ADDRSTRLEN], gatewaystr[INET6_ADDRSTRLEN];
 484         int index = -1;
 485
 486         if (family == AF_INET) {
 487                 struct in_addr dst = { INADDR_ANY }, gateway = { INADDR_ANY };
 488
 489                 extract_ipv4_route(msg, bytes, &index, &dst, &gateway);
 490
 491                 inet_ntop(family, &dst, dststr, sizeof(dststr));
 492                 inet_ntop(family, &gateway, gatewaystr, sizeof(gatewaystr));
 493
 494                 /* skip host specific routes */
 495                 if (scope != RT_SCOPE_UNIVERSE &&
 496                         !(scope == RT_SCOPE_LINK && dst.s_addr == INADDR_ANY))
 497                         return;
 498
 499                 if (dst.s_addr != INADDR_ANY)
 500                         return;
 501
 502         }  else if (family == AF_INET6) {
 503                 struct in6_addr dst = IN6ADDR_ANY_INIT,
 504                                 gateway = IN6ADDR_ANY_INIT;
 505
 506                 extract_ipv6_route(msg, bytes, &index, &dst, &gateway);
 507
 508                 inet_ntop(family, &dst, dststr, sizeof(dststr));
 509                 inet_ntop(family, &gateway, gatewaystr, sizeof(gatewaystr));
 510
 511                 /* skip host specific routes */
 512                 if (scope != RT_SCOPE_UNIVERSE &&
 513                         !(scope == RT_SCOPE_LINK &&
 514                                 IN6_IS_ADDR_UNSPECIFIED(&dst)))
 515                         return;
 516
 517                 if (!IN6_IS_ADDR_UNSPECIFIED(&dst))
 518                         return;
 519         } else
 520                 return;
 521
 522         for (list = rtnl_list; list; list = list->next) {
 523                 struct vpn_rtnl *rtnl = list->data;
 524
 525                 if (rtnl->delgateway)
 526                         rtnl->delgateway(index, gatewaystr);
 527         }
 528 }
 529
 530 static inline void print_ether(struct rtattr *attr, const char *name)
 531 {
 532         int len = (int) RTA_PAYLOAD(attr);
 533
 534         if (len == ETH_ALEN) {
 535                 struct ether_addr eth;
 536                 memcpy(&eth, RTA_DATA(attr), ETH_ALEN);
 537                 print("  attr %s (len %d) %s\n", name, len, ether_ntoa(&eth));
 538         } else
 539                 print("  attr %s (len %d)\n", name, len);
 540 }
 541
 542 static inline void print_inet(struct rtattr *attr, const char *name,
 543                                                         unsigned char family)
 544 {
 545         int len = (int) RTA_PAYLOAD(attr);
 546
 547         if (family == AF_INET && len == sizeof(struct in_addr)) {
 548                 struct in_addr addr;
 549                 addr = *((struct in_addr *) RTA_DATA(attr));
 550                 print("  attr %s (len %d) %s\n", name, len, inet_ntoa(addr));
 551         } else
 552                 print("  attr %s (len %d)\n", name, len);
 553 }
 554
 555 static inline void print_string(struct rtattr *attr, const char *name)
 556 {
 557         print("  attr %s (len %d) %s\n", name, (int) RTA_PAYLOAD(attr),
 558                                                 (char *) RTA_DATA(attr));
 559 }
 560
 561 static inline void print_byte(struct rtattr *attr, const char *name)
 562 {
 563         print("  attr %s (len %d) 0x%02x\n", name, (int) RTA_PAYLOAD(attr),
 564                                         *((unsigned char *) RTA_DATA(attr)));
 565 }
 566
 567 static inline void print_integer(struct rtattr *attr, const char *name)
 568 {
 569         print("  attr %s (len %d) %d\n", name, (int) RTA_PAYLOAD(attr),
 570                                                 *((int *) RTA_DATA(attr)));
 571 }
 572
 573 static inline void print_attr(struct rtattr *attr, const char *name)
 574 {
 575         int len = (int) RTA_PAYLOAD(attr);
 576
 577         if (name && len > 0)
 578                 print("  attr %s (len %d)\n", name, len);
 579         else
 580                 print("  attr %d (len %d)\n", attr->rta_type, len);
 581 }
 582
 583 static void rtnl_link(struct nlmsghdr *hdr)
 584 {
 585         struct ifinfomsg *msg;
 586         struct rtattr *attr;
 587         int bytes;
 588
 589         msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
 590         bytes = IFLA_PAYLOAD(hdr);
 591
 592         print("ifi_index %d ifi_flags 0x%04x", msg->ifi_index, msg->ifi_flags);
 593
 594         for (attr = IFLA_RTA(msg); RTA_OK(attr, bytes);
 595                                         attr = RTA_NEXT(attr, bytes)) {
 596                 switch (attr->rta_type) {
 597                 case IFLA_ADDRESS:
 598                         print_ether(attr, "address");
 599                         break;
 600                 case IFLA_BROADCAST:
 601                         print_ether(attr, "broadcast");
 602                         break;
 603                 case IFLA_IFNAME:
 604                         print_string(attr, "ifname");
 605                         break;
 606                 case IFLA_MTU:
 607                         print_integer(attr, "mtu");
 608                         break;
 609                 case IFLA_LINK:
 610                         print_attr(attr, "link");
 611                         break;
 612                 case IFLA_QDISC:
 613                         print_attr(attr, "qdisc");
 614                         break;
 615                 case IFLA_STATS:
 616                         print_attr(attr, "stats");
 617                         break;
 618                 case IFLA_COST:
 619                         print_attr(attr, "cost");
 620                         break;
 621                 case IFLA_PRIORITY:
 622                         print_attr(attr, "priority");
 623                         break;
 624                 case IFLA_MASTER:
 625                         print_attr(attr, "master");
 626                         break;
 627                 case IFLA_WIRELESS:
 628                         print_attr(attr, "wireless");
 629                         break;
 630                 case IFLA_PROTINFO:
 631                         print_attr(attr, "protinfo");
 632                         break;
 633                 case IFLA_TXQLEN:
 634                         print_integer(attr, "txqlen");
 635                         break;
 636                 case IFLA_MAP:
 637                         print_attr(attr, "map");
 638                         break;
 639                 case IFLA_WEIGHT:
 640                         print_attr(attr, "weight");
 641                         break;
 642                 case IFLA_OPERSTATE:
 643                         print_byte(attr, "operstate");
 644                         break;
 645                 case IFLA_LINKMODE:
 646                         print_byte(attr, "linkmode");
 647                         break;
 648                 default:
 649                         print_attr(attr, NULL);
 650                         break;
 651                 }
 652         }
 653 }
 654
 655 static void rtnl_newlink(struct nlmsghdr *hdr)
 656 {
 657         struct ifinfomsg *msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
 658
 659         rtnl_link(hdr);
 660
 661         process_newlink(msg->ifi_type, msg->ifi_index, msg->ifi_flags,
 662                                 msg->ifi_change, msg, IFA_PAYLOAD(hdr));
 663 }
 664
 665 static void rtnl_dellink(struct nlmsghdr *hdr)
 666 {
 667         struct ifinfomsg *msg = (struct ifinfomsg *) NLMSG_DATA(hdr);
 668
 669         rtnl_link(hdr);
 670
 671         process_dellink(msg->ifi_type, msg->ifi_index, msg->ifi_flags,
 672                                 msg->ifi_change, msg, IFA_PAYLOAD(hdr));
 673 }
 674
 675 static void rtnl_route(struct nlmsghdr *hdr)
 676 {
 677         struct rtmsg *msg;
 678         struct rtattr *attr;
 679         int bytes;
 680
 681         msg = (struct rtmsg *) NLMSG_DATA(hdr);
 682         bytes = RTM_PAYLOAD(hdr);
 683
 684         print("rtm_family %d rtm_table %d rtm_protocol %d",
 685                         msg->rtm_family, msg->rtm_table, msg->rtm_protocol);
 686         print("rtm_scope %d rtm_type %d rtm_flags 0x%04x",
 687                                 msg->rtm_scope, msg->rtm_type, msg->rtm_flags);
 688
 689         for (attr = RTM_RTA(msg); RTA_OK(attr, bytes);
 690                                         attr = RTA_NEXT(attr, bytes)) {
 691                 switch (attr->rta_type) {
 692                 case RTA_DST:
 693                         print_inet(attr, "dst", msg->rtm_family);
 694                         break;
 695                 case RTA_SRC:
 696                         print_inet(attr, "src", msg->rtm_family);
 697                         break;
 698                 case RTA_IIF:
 699                         print_string(attr, "iif");
 700                         break;
 701                 case RTA_OIF:
 702                         print_integer(attr, "oif");
 703                         break;
 704                 case RTA_GATEWAY:
 705                         print_inet(attr, "gateway", msg->rtm_family);
 706                         break;
 707                 case RTA_PRIORITY:
 708                         print_attr(attr, "priority");
 709                         break;
 710                 case RTA_PREFSRC:
 711                         print_inet(attr, "prefsrc", msg->rtm_family);
 712                         break;
 713                 case RTA_METRICS:
 714                         print_attr(attr, "metrics");
 715                         break;
 716                 case RTA_TABLE:
 717                         print_integer(attr, "table");
 718                         break;
 719                 default:
 720                         print_attr(attr, NULL);
 721                         break;
 722                 }
 723         }
 724 }
 725
 726 static bool is_route_rtmsg(struct rtmsg *msg)
 727 {
 728
 729         if (msg->rtm_table != RT_TABLE_MAIN)
 730                 return false;
 731
 732         if (msg->rtm_protocol != RTPROT_BOOT &&
 733                         msg->rtm_protocol != RTPROT_KERNEL)
 734                 return false;
 735
 736         if (msg->rtm_type != RTN_UNICAST)
 737                 return false;
 738
 739         return true;
 740 }
 741
 742 static void rtnl_newroute(struct nlmsghdr *hdr)
 743 {
 744         struct rtmsg *msg = (struct rtmsg *) NLMSG_DATA(hdr);
 745
 746         rtnl_route(hdr);
 747
 748         if (is_route_rtmsg(msg))
 749                 process_newroute(msg->rtm_family, msg->rtm_scope,
 750                                                 msg, RTM_PAYLOAD(hdr));
 751 }
 752
 753 static void rtnl_delroute(struct nlmsghdr *hdr)
 754 {
 755         struct rtmsg *msg = (struct rtmsg *) NLMSG_DATA(hdr);
 756
 757         rtnl_route(hdr);
 758
 759         if (is_route_rtmsg(msg))
 760                 process_delroute(msg->rtm_family, msg->rtm_scope,
 761                                                 msg, RTM_PAYLOAD(hdr));
 762 }
 763
 764 static const char *type2string(uint16_t type)
 765 {
 766         switch (type) {
 767         case NLMSG_NOOP:
 768                 return "NOOP";
 769         case NLMSG_ERROR:
 770                 return "ERROR";
 771         case NLMSG_DONE:
 772                 return "DONE";
 773         case NLMSG_OVERRUN:
 774                 return "OVERRUN";
 775         case RTM_GETLINK:
 776                 return "GETLINK";
 777         case RTM_NEWLINK:
 778                 return "NEWLINK";
 779         case RTM_DELLINK:
 780                 return "DELLINK";
 781         case RTM_NEWADDR:
 782                 return "NEWADDR";
 783         case RTM_DELADDR:
 784                 return "DELADDR";
 785         case RTM_GETROUTE:
 786                 return "GETROUTE";
 787         case RTM_NEWROUTE:
 788                 return "NEWROUTE";
 789         case RTM_DELROUTE:
 790                 return "DELROUTE";
 791         case RTM_NEWNDUSEROPT:
 792                 return "NEWNDUSEROPT";
 793         default:
 794                 return "UNKNOWN";
 795         }
 796 }
 797
 798 static GIOChannel *channel = NULL;
 799
 800 #define RTNL_REQUEST_SIZE (NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(struct rtgenmsg)))
 801
 802 static GSList *request_list = NULL;
 803 static guint32 request_seq = 0;
 804
 805 static struct nlmsghdr *find_request(guint32 seq)
 806 {
 807         GSList *list;
 808
 809         for (list = request_list; list; list = list->next) {
 810                 struct nlmsghdr *hdr = list->data;
 811
 812                 if (hdr->nlmsg_seq == seq)
 813                         return hdr;
 814         }
 815
 816         return NULL;
 817 }
 818
 819 static int send_request(struct nlmsghdr *hdr)
 820 {
 821         struct sockaddr_nl addr;
 822         int sk;
 823
 824         debug("%s len %d type %d flags 0x%04x seq %d",
 825                                 type2string(hdr->nlmsg_type),
 826                                 hdr->nlmsg_len, hdr->nlmsg_type,
 827                                 hdr->nlmsg_flags, hdr->nlmsg_seq);
 828
 829         sk = g_io_channel_unix_get_fd(channel);
 830
 831         memset(&addr, 0, sizeof(addr));
 832         addr.nl_family = AF_NETLINK;
 833
 834         return sendto(sk, hdr, hdr->nlmsg_len, 0,
 835                                 (struct sockaddr *) &addr, sizeof(addr));
 836 }
 837
 838 static int queue_request(struct nlmsghdr *hdr)
 839 {
 840         request_list = g_slist_append(request_list, hdr);
 841
 842         if (g_slist_length(request_list) > 1)
 843                 return 0;
 844
 845         return send_request(hdr);
 846 }
 847
 848 static int process_response(guint32 seq)
 849 {
 850         struct nlmsghdr *hdr;
 851
 852         debug("seq %d", seq);
 853
 854         hdr = find_request(seq);
 855         if (hdr) {
 856                 request_list = g_slist_remove(request_list, hdr);
 857                 g_free(hdr);
 858         }
 859
 860         hdr = g_slist_nth_data(request_list, 0);
 861         if (!hdr)
 862                 return 0;
 863
 864         return send_request(hdr);
 865 }
 866
 867 static void rtnl_message(void *buf, size_t len)
 868 {
 869         debug("buf %p len %zd", buf, len);
 870
 871         while (len > 0) {
 872                 struct nlmsghdr *hdr = buf;
 873                 struct nlmsgerr *err;
 874
 875                 if (!NLMSG_OK(hdr, len))
 876                         break;
 877
 878                 debug("%s len %u type %u flags 0x%04x seq %u pid %u",
 879                                         type2string(hdr->nlmsg_type),
 880                                         hdr->nlmsg_len, hdr->nlmsg_type,
 881                                         hdr->nlmsg_flags, hdr->nlmsg_seq,
 882                                         hdr->nlmsg_pid);
 883
 884                 switch (hdr->nlmsg_type) {
 885                 case NLMSG_NOOP:
 886                 case NLMSG_OVERRUN:
 887                         return;
 888                 case NLMSG_DONE:
 889                         process_response(hdr->nlmsg_seq);
 890                         return;
 891                 case NLMSG_ERROR:
 892                         err = NLMSG_DATA(hdr);
 893                         DBG("error %d (%s)", -err->error,
 894                                                 strerror(-err->error));
 895                         return;
 896                 case RTM_NEWLINK:
 897                         rtnl_newlink(hdr);
 898                         break;
 899                 case RTM_DELLINK:
 900                         rtnl_dellink(hdr);
 901                         break;
 902                 case RTM_NEWADDR:
 903                         break;
 904                 case RTM_DELADDR:
 905                         break;
 906                 case RTM_NEWROUTE:
 907                         rtnl_newroute(hdr);
 908                         break;
 909                 case RTM_DELROUTE:
 910                         rtnl_delroute(hdr);
 911                         break;
 912                 }
 913
 914                 len -= hdr->nlmsg_len;
 915                 buf += hdr->nlmsg_len;
 916         }
 917 }
 918
 919 static gboolean netlink_event(GIOChannel *chan, GIOCondition cond, gpointer data)
 920 {
 921         unsigned char buf[4096];
 922         struct sockaddr_nl nladdr;
 923         socklen_t addr_len = sizeof(nladdr);
 924         ssize_t status;
 925         int fd;
 926
 927         if (cond & (G_IO_NVAL | G_IO_HUP | G_IO_ERR))
 928                 return FALSE;
 929
 930         memset(buf, 0, sizeof(buf));
 931         memset(&nladdr, 0, sizeof(nladdr));
 932
 933         fd = g_io_channel_unix_get_fd(chan);
 934
 935         status = recvfrom(fd, buf, sizeof(buf), 0,
 936                        (struct sockaddr *) &nladdr, &addr_len);
 937         if (status < 0) {
 938                 if (errno == EINTR || errno == EAGAIN)
 939                         return TRUE;
 940
 941                 return FALSE;
 942         }
 943
 944         if (status == 0)
 945                 return FALSE;
 946
 947         if (nladdr.nl_pid != 0) { /* not sent by kernel, ignore */
 948                 DBG("Received msg from %u, ignoring it", nladdr.nl_pid);
 949                 return TRUE;
 950         }
 951
 952         rtnl_message(buf, status);
 953
 954         return TRUE;
 955 }
 956
 957 static int send_getlink(void)
 958 {
 959         struct nlmsghdr *hdr;
 960         struct rtgenmsg *msg;
 961
 962         debug("");
 963
 964         hdr = g_malloc0(RTNL_REQUEST_SIZE);
 965
 966         hdr->nlmsg_len = RTNL_REQUEST_SIZE;
 967         hdr->nlmsg_type = RTM_GETLINK;
 968         hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
 969         hdr->nlmsg_pid = 0;
 970         hdr->nlmsg_seq = request_seq++;
 971
 972         msg = (struct rtgenmsg *) NLMSG_DATA(hdr);
 973         msg->rtgen_family = AF_INET;
 974
 975         return queue_request(hdr);
 976 }
 977
 978 static int send_getaddr(void)
 979 {
 980         struct nlmsghdr *hdr;
 981         struct rtgenmsg *msg;
 982
 983         debug("");
 984
 985         hdr = g_malloc0(RTNL_REQUEST_SIZE);
 986
 987         hdr->nlmsg_len = RTNL_REQUEST_SIZE;
 988         hdr->nlmsg_type = RTM_GETADDR;
 989         hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
 990         hdr->nlmsg_pid = 0;
 991         hdr->nlmsg_seq = request_seq++;
 992
 993         msg = (struct rtgenmsg *) NLMSG_DATA(hdr);
 994         msg->rtgen_family = AF_INET;
 995
 996         return queue_request(hdr);
 997 }
 998
 999 static int send_getroute(void)
1000 {
1001         struct nlmsghdr *hdr;
1002         struct rtgenmsg *msg;
1003
1004         debug("");
1005
1006         hdr = g_malloc0(RTNL_REQUEST_SIZE);
1007
1008         hdr->nlmsg_len = RTNL_REQUEST_SIZE;
1009         hdr->nlmsg_type = RTM_GETROUTE;
1010         hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
1011         hdr->nlmsg_pid = 0;
1012         hdr->nlmsg_seq = request_seq++;
1013
1014         msg = (struct rtgenmsg *) NLMSG_DATA(hdr);
1015         msg->rtgen_family = AF_INET;
1016
1017         return queue_request(hdr);
1018 }
1019
1020 static gboolean update_timeout_cb(gpointer user_data)
1021 {
1022         __vpn_rtnl_request_update();
1023
1024         return TRUE;
1025 }
1026
1027 static void update_interval_callback(guint min)
1028 {
1029         if (update_timeout > 0)
1030                 g_source_remove(update_timeout);
1031
1032         if (min < G_MAXUINT) {
1033                 update_interval = min;
1034                 update_timeout = g_timeout_add_seconds(update_interval,
1035                                                 update_timeout_cb, NULL);
1036         } else {
1037                 update_timeout = 0;
1038                 update_interval = G_MAXUINT;
1039         }
1040 }
1041
1042 static gint compare_interval(gconstpointer a, gconstpointer b)
1043 {
1044         guint val_a = GPOINTER_TO_UINT(a);
1045         guint val_b = GPOINTER_TO_UINT(b);
1046
1047         return val_a - val_b;
1048 }
1049
1050 unsigned int __vpn_rtnl_update_interval_add(unsigned int interval)
1051 {
1052         guint min;
1053
1054         if (interval == 0)
1055                 return 0;
1056
1057         update_list = g_slist_insert_sorted(update_list,
1058                         GUINT_TO_POINTER(interval), compare_interval);
1059
1060         min = GPOINTER_TO_UINT(g_slist_nth_data(update_list, 0));
1061         if (min < update_interval) {
1062                 update_interval_callback(min);
1063                 __vpn_rtnl_request_update();
1064         }
1065
1066         return update_interval;
1067 }
1068
1069 unsigned int __vpn_rtnl_update_interval_remove(unsigned int interval)
1070 {
1071         guint min = G_MAXUINT;
1072
1073         if (interval == 0)
1074                 return 0;
1075
1076         update_list = g_slist_remove(update_list, GINT_TO_POINTER(interval));
1077
1078         if (update_list)
1079                 min = GPOINTER_TO_UINT(g_slist_nth_data(update_list, 0));
1080
1081         if (min > update_interval)
1082                 update_interval_callback(min);
1083
1084         return min;
1085 }
1086
1087 int __vpn_rtnl_request_update(void)
1088 {
1089         return send_getlink();
1090 }
1091
1092 int __vpn_rtnl_init(void)
1093 {
1094         struct sockaddr_nl addr;
1095         int sk;
1096
1097         DBG("");
1098
1099         interface_list = g_hash_table_new_full(g_direct_hash, g_direct_equal,
1100                                                         NULL, free_interface);
1101
1102         sk = socket(PF_NETLINK, SOCK_DGRAM | SOCK_CLOEXEC, NETLINK_ROUTE);
1103         if (sk < 0)
1104                 return -1;
1105
1106         memset(&addr, 0, sizeof(addr));
1107         addr.nl_family = AF_NETLINK;
1108         addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE |
1109                                 RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE |
1110                                 (1<<(RTNLGRP_ND_USEROPT-1));
1111
1112         if (bind(sk, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
1113                 close(sk);
1114                 return -1;
1115         }
1116
1117         channel = g_io_channel_unix_new(sk);
1118         g_io_channel_set_close_on_unref(channel, TRUE);
1119
1120         g_io_channel_set_encoding(channel, NULL, NULL);
1121         g_io_channel_set_buffered(channel, FALSE);
1122
1123         g_io_add_watch(channel, G_IO_IN | G_IO_NVAL | G_IO_HUP | G_IO_ERR,
1124                                                         netlink_event, NULL);
1125
1126         return 0;
1127 }
1128
1129 void __vpn_rtnl_start(void)
1130 {
1131         DBG("");
1132
1133         send_getlink();
1134         send_getaddr();
1135         send_getroute();
1136 }
1137
1138 void __vpn_rtnl_cleanup(void)
1139 {
1140         GSList *list;
1141
1142         DBG("");
1143
1144         for (list = watch_list; list; list = list->next) {
1145                 struct watch_data *watch = list->data;
1146
1147                 DBG("removing watch %d", watch->id);
1148
1149                 g_free(watch);
1150                 list->data = NULL;
1151         }
1152
1153         g_slist_free(watch_list);
1154         watch_list = NULL;
1155
1156         g_slist_free(update_list);
1157         update_list = NULL;
1158
1159         for (list = request_list; list; list = list->next) {
1160                 struct nlmsghdr *hdr = list->data;
1161
1162                 debug("%s len %d type %d flags 0x%04x seq %d",
1163                                 type2string(hdr->nlmsg_type),
1164                                 hdr->nlmsg_len, hdr->nlmsg_type,
1165                                 hdr->nlmsg_flags, hdr->nlmsg_seq);
1166
1167                 g_free(hdr);
1168                 list->data = NULL;
1169         }
1170
1171         g_slist_free(request_list);
1172         request_list = NULL;
1173
1174         g_io_channel_shutdown(channel, TRUE, NULL);
1175         g_io_channel_unref(channel);
1176
1177         channel = NULL;
1178
1179         g_hash_table_destroy(interface_list);
1180 }