interface.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "device.h"
   7 #include "interface.h"
   8 #include "interface-ip.h"
   9 #include "proto.h"
  10 #include "ubus.h"
  11 #include "config.h"
  12 #include "system.h"
  13
  14 struct vlist_tree interfaces;
  15 static LIST_HEAD(iface_all_users);
  16
  17 enum {
  18         IFACE_ATTR_IFNAME,
  19         IFACE_ATTR_PROTO,
  20         IFACE_ATTR_AUTO,
  21         IFACE_ATTR_DEFAULTROUTE,
  22         IFACE_ATTR_METRIC,
  23         IFACE_ATTR_MAX
  24 };
  25
  26 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  27         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  28         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  29         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  30         [IFACE_ATTR_DEFAULTROUTE] = { .name = "defaultroute", .type = BLOBMSG_TYPE_BOOL },
  31         [IFACE_ATTR_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  32 };
  33
  34 const struct config_param_list interface_attr_list = {
  35         .n_params = IFACE_ATTR_MAX,
  36         .params = iface_attrs,
  37 };
  38
  39 static void
  40 interface_clear_errors(struct interface *iface)
  41 {
  42         struct interface_error *error, *tmp;
  43
  44         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  45                 list_del(&error->list);
  46                 free(error);
  47         }
  48 }
  49
  50 void interface_add_error(struct interface *iface, const char *subsystem,
  51                          const char *code, const char **data, int n_data)
  52 {
  53         struct interface_error *error;
  54         int i, len = 0;
  55         int *datalen = NULL;
  56         char *dest;
  57
  58         if (n_data) {
  59                 len = n_data * sizeof(char *);
  60                 datalen = alloca(len);
  61                 for (i = 0; i < n_data; i++) {
  62                         datalen[i] = strlen(data[i]) + 1;
  63                         len += datalen[i];
  64                 }
  65         }
  66
  67         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  68         if (!error)
  69                 return;
  70
  71         list_add_tail(&error->list, &iface->errors);
  72         error->subsystem = subsystem;
  73         error->code = code;
  74
  75         dest = (char *) &error->data[n_data + 1];
  76         for (i = 0; i < n_data; i++) {
  77                 error->data[i] = dest;
  78                 memcpy(dest, data[i], datalen[i]);
  79                 dest += datalen[i];
  80         }
  81         error->data[n_data] = NULL;
  82 }
  83
  84 static void
  85 interface_data_del(struct interface *iface, struct interface_data *data)
  86 {
  87         avl_delete(&iface->data, &data->node);
  88         free(data);
  89 }
  90
  91 static void
  92 interface_data_flush(struct interface *iface)
  93 {
  94         struct interface_data *d, *tmp;
  95
  96         avl_for_each_element_safe(&iface->data, d, node, tmp)
  97                 interface_data_del(iface, d);
  98 }
  99
 100 int
 101 interface_add_data(struct interface *iface, const struct blob_attr *data)
 102 {
 103         struct interface_data *n, *o;
 104
 105         if (!blobmsg_check_attr(data, true))
 106                 return UBUS_STATUS_INVALID_ARGUMENT;
 107
 108         n = calloc(1, sizeof(*data) + blob_pad_len(data));
 109         memcpy(n->data, data, blob_pad_len(data));
 110         n->node.key = blobmsg_name(data);
 111
 112         o = avl_find_element(&iface->data, n->node.key, o, node);
 113         if (o)
 114                 interface_data_del(iface, o);
 115
 116         avl_insert(&iface->data, &n->node);
 117         return 0;
 118 }
 119
 120 static void
 121 interface_event(struct interface *iface, enum interface_event ev)
 122 {
 123         struct interface_user *dep, *tmp;
 124
 125         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 126                 dep->cb(dep, iface, ev);
 127
 128         list_for_each_entry_safe(dep, tmp, &iface_all_users, list)
 129                 dep->cb(dep, iface, ev);
 130
 131         interface_queue_event(iface, ev);
 132 }
 133
 134 static void
 135 interface_flush_state(struct interface *iface)
 136 {
 137         if (iface->main_dev.dev)
 138                 device_release(&iface->main_dev);
 139         if (iface->l3_dev.dev)
 140                 device_release(&iface->l3_dev);
 141         interface_data_flush(iface);
 142 }
 143
 144 static void
 145 mark_interface_down(struct interface *iface)
 146 {
 147         if (iface->state == IFS_UP)
 148                 interface_event(iface, IFEV_DOWN);
 149         interface_ip_set_enabled(&iface->config_ip, false);
 150         interface_ip_flush(&iface->proto_ip);
 151         interface_flush_state(iface);
 152         system_flush_routes();
 153         iface->state = IFS_DOWN;
 154 }
 155
 156 void
 157 __interface_set_down(struct interface *iface, bool force)
 158 {
 159         interface_clear_errors(iface);
 160
 161         if (iface->state == IFS_DOWN ||
 162                 iface->state == IFS_TEARDOWN)
 163                 return;
 164
 165         if (iface->state == IFS_UP)
 166                 interface_event(iface, IFEV_DOWN);
 167         iface->state = IFS_TEARDOWN;
 168         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 169         if (force)
 170                 interface_flush_state(iface);
 171 }
 172
 173 static void
 174 interface_cb(struct device_user *dep, enum device_event ev)
 175 {
 176         struct interface *iface;
 177         bool new_state;
 178
 179         iface = container_of(dep, struct interface, main_dev);
 180         switch (ev) {
 181         case DEV_EVENT_ADD:
 182                 new_state = true;
 183                 break;
 184         case DEV_EVENT_REMOVE:
 185                 new_state = false;
 186                 break;
 187         default:
 188                 return;
 189         }
 190
 191         interface_set_available(iface, new_state);
 192 }
 193
 194 void
 195 interface_set_available(struct interface *iface, bool new_state)
 196 {
 197         if (iface->available == new_state)
 198                 return;
 199
 200         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 201         iface->available = new_state;
 202
 203         if (new_state) {
 204                 if (iface->autostart && !config_init)
 205                         interface_set_up(iface);
 206         } else
 207                 __interface_set_down(iface, true);
 208 }
 209
 210 void
 211 interface_add_user(struct interface_user *dep, struct interface *iface)
 212 {
 213         if (!iface) {
 214                 list_add(&dep->list, &iface_all_users);
 215                 return;
 216         }
 217
 218         dep->iface = iface;
 219         list_add(&dep->list, &iface->users);
 220         if (iface->state == IFS_UP)
 221                 dep->cb(dep, iface, IFEV_UP);
 222 }
 223
 224 void
 225 interface_remove_user(struct interface_user *dep)
 226 {
 227         list_del_init(&dep->list);
 228         dep->iface = NULL;
 229 }
 230
 231 static void
 232 interface_claim_device(struct interface *iface)
 233 {
 234         struct device *dev;
 235
 236         if (iface->ifname &&
 237                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 238                 dev = device_get(iface->ifname, true);
 239                 if (dev)
 240                         interface_set_main_dev(iface, dev);
 241         }
 242         if (iface->proto_handler->flags & PROTO_FLAG_INIT_AVAILABLE)
 243                 interface_set_available(iface, true);
 244 }
 245
 246
 247 static void
 248 interface_cleanup(struct interface *iface, bool reload)
 249 {
 250         struct interface_user *dep, *tmp;
 251
 252         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 253                 interface_remove_user(dep);
 254
 255         interface_dequeue_event(iface);
 256         interface_ip_flush(&iface->config_ip);
 257         interface_flush_state(iface);
 258         interface_clear_errors(iface);
 259         if (iface->main_dev.dev &&
 260             (!reload || !iface->main_dev.hotplug))
 261                 interface_set_main_dev(iface, NULL);
 262         interface_set_proto_state(iface, NULL);
 263 }
 264
 265 static void
 266 interface_do_free(struct interface *iface)
 267 {
 268         interface_event(iface, IFEV_FREE);
 269         interface_cleanup(iface, false);
 270         free(iface->config);
 271         netifd_ubus_remove_interface(iface);
 272         avl_delete(&interfaces.avl, &iface->node.avl);
 273         free(iface);
 274 }
 275
 276 static void
 277 interface_do_reload(struct interface *iface)
 278 {
 279         interface_cleanup(iface, true);
 280         proto_init_interface(iface, iface->config);
 281         interface_claim_device(iface);
 282 }
 283
 284 static void
 285 interface_handle_config_change(struct interface *iface)
 286 {
 287         switch(iface->config_state) {
 288         case IFC_NORMAL:
 289                 break;
 290         case IFC_RELOAD:
 291                 interface_do_reload(iface);
 292                 break;
 293         case IFC_REMOVE:
 294                 interface_do_free(iface);
 295                 return;
 296         }
 297         if (iface->autostart && iface->available)
 298                 interface_set_up(iface);
 299 }
 300
 301 static void
 302 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 303 {
 304         struct interface *iface = state->iface;
 305
 306         switch (ev) {
 307         case IFPEV_UP:
 308                 if (iface->state != IFS_SETUP)
 309                         return;
 310
 311                 interface_ip_set_enabled(&iface->config_ip, true);
 312                 system_flush_routes();
 313                 iface->state = IFS_UP;
 314                 iface->start_time = system_get_rtime();
 315                 interface_event(iface, IFEV_UP);
 316                 interface_write_resolv_conf();
 317                 netifd_log_message(L_NOTICE, "Interface '%s' is now up\n", iface->name);
 318                 break;
 319         case IFPEV_DOWN:
 320                 if (iface->state == IFS_DOWN)
 321                         return;
 322
 323                 netifd_log_message(L_NOTICE, "Interface '%s' is now down\n", iface->name);
 324                 mark_interface_down(iface);
 325                 interface_handle_config_change(iface);
 326                 break;
 327         case IFPEV_LINK_LOST:
 328                 if (iface->state != IFS_UP)
 329                         return;
 330
 331                 netifd_log_message(L_NOTICE, "Interface '%s' has lost the connection\n", iface->name);
 332                 mark_interface_down(iface);
 333                 iface->state = IFS_SETUP;
 334                 break;
 335         }
 336 }
 337
 338 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 339 {
 340         if (iface->proto) {
 341                 iface->proto->free(iface->proto);
 342                 iface->proto = NULL;
 343         }
 344         iface->state = IFS_DOWN;
 345         iface->proto = state;
 346         if (!state)
 347                 return;
 348
 349         state->proto_event = interface_proto_cb;
 350         state->iface = iface;
 351 }
 352
 353 void
 354 interface_init(struct interface *iface, const char *name,
 355                struct blob_attr *config)
 356 {
 357         struct blob_attr *tb[IFACE_ATTR_MAX];
 358         struct blob_attr *cur;
 359         const char *proto_name = NULL;
 360
 361         strncpy(iface->name, name, sizeof(iface->name) - 1);
 362         INIT_LIST_HEAD(&iface->errors);
 363         INIT_LIST_HEAD(&iface->users);
 364         INIT_LIST_HEAD(&iface->hotplug_list);
 365         interface_ip_init(iface);
 366         avl_init(&iface->data, avl_strcmp, false, NULL);
 367         iface->config_ip.enabled = false;
 368
 369         iface->main_dev.cb = interface_cb;
 370
 371         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 372                       blob_data(config), blob_len(config));
 373
 374         if ((cur = tb[IFACE_ATTR_PROTO]))
 375                 proto_name = blobmsg_data(cur);
 376
 377         proto_attach_interface(iface, proto_name);
 378
 379         iface->autostart = blobmsg_get_bool_default(tb[IFACE_ATTR_AUTO], true);
 380         iface->proto_ip.no_defaultroute =
 381                 !blobmsg_get_bool_default(tb[IFACE_ATTR_DEFAULTROUTE], true);
 382
 383         iface->config_autostart = iface->autostart;
 384 }
 385
 386 void
 387 interface_add(struct interface *iface, struct blob_attr *config)
 388 {
 389         struct blob_attr *tb[IFACE_ATTR_MAX];
 390         struct blob_attr *cur;
 391
 392         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 393                       blob_data(config), blob_len(config));
 394
 395         if ((cur = tb[IFACE_ATTR_IFNAME]))
 396                 iface->ifname = blobmsg_data(cur);
 397
 398         iface->config = config;
 399         vlist_add(&interfaces, &iface->node, iface->name);
 400 }
 401
 402 void
 403 interface_set_l3_dev(struct interface *iface, struct device *dev)
 404 {
 405         bool enabled = iface->config_ip.enabled;
 406         bool claimed = iface->l3_dev.claimed;
 407
 408         if (iface->l3_dev.dev == dev)
 409                 return;
 410
 411         interface_ip_set_enabled(&iface->config_ip, false);
 412         interface_ip_flush(&iface->proto_ip);
 413         device_add_user(&iface->l3_dev, dev);
 414
 415         if (dev) {
 416                 if (claimed)
 417                         device_claim(&iface->l3_dev);
 418                 interface_ip_set_enabled(&iface->config_ip, enabled);
 419         }
 420 }
 421
 422 void
 423 interface_set_main_dev(struct interface *iface, struct device *dev)
 424 {
 425         bool set_l3 = (iface->main_dev.dev == iface->l3_dev.dev);
 426         bool claimed = iface->l3_dev.claimed;
 427
 428         if (iface->main_dev.dev == dev)
 429                 return;
 430
 431         if (set_l3)
 432                 interface_set_l3_dev(iface, dev);
 433
 434         device_add_user(&iface->main_dev, dev);
 435         if (claimed)
 436                 device_claim(&iface->l3_dev);
 437
 438         if (!iface->l3_dev.dev)
 439                 interface_set_l3_dev(iface, dev);
 440 }
 441
 442 int
 443 interface_remove_link(struct interface *iface, struct device *dev)
 444 {
 445         struct device *mdev = iface->main_dev.dev;
 446
 447         if (mdev && mdev->hotplug_ops)
 448                 return mdev->hotplug_ops->del(mdev, dev);
 449
 450         if (!iface->main_dev.hotplug)
 451                 return UBUS_STATUS_INVALID_ARGUMENT;
 452
 453         if (dev != iface->main_dev.dev)
 454                 return UBUS_STATUS_INVALID_ARGUMENT;
 455
 456         device_remove_user(&iface->main_dev);
 457         return 0;
 458 }
 459
 460 int
 461 interface_add_link(struct interface *iface, struct device *dev)
 462 {
 463         struct device *mdev = iface->main_dev.dev;
 464
 465         if (mdev == dev)
 466                 return 0;
 467
 468         if (iface->main_dev.hotplug)
 469                 device_remove_user(&iface->main_dev);
 470
 471         if (mdev) {
 472                 if (mdev->hotplug_ops)
 473                         return mdev->hotplug_ops->add(mdev, dev);
 474                 else
 475                         return UBUS_STATUS_NOT_SUPPORTED;
 476         }
 477
 478         interface_set_main_dev(iface, dev);
 479         iface->main_dev.hotplug = true;
 480         return 0;
 481 }
 482
 483 int
 484 interface_set_up(struct interface *iface)
 485 {
 486         int ret;
 487
 488         iface->autostart = true;
 489
 490         if (iface->state != IFS_DOWN)
 491                 return 0;
 492
 493         interface_clear_errors(iface);
 494         if (!iface->available) {
 495                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 496                 return -1;
 497         }
 498
 499         if (iface->main_dev.dev) {
 500                 ret = device_claim(&iface->main_dev);
 501                 if (ret)
 502                         return ret;
 503         }
 504
 505         iface->state = IFS_SETUP;
 506         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 507         if (ret) {
 508                 mark_interface_down(iface);
 509                 return ret;
 510         }
 511
 512         return 0;
 513 }
 514
 515 int
 516 interface_set_down(struct interface *iface)
 517 {
 518         if (!iface) {
 519                 vlist_for_each_element(&interfaces, iface, node)
 520                         __interface_set_down(iface, false);
 521         } else {
 522                 iface->autostart = false;
 523                 __interface_set_down(iface, false);
 524         }
 525
 526         return 0;
 527 }
 528
 529 void
 530 interface_start_pending(void)
 531 {
 532         struct interface *iface;
 533
 534         vlist_for_each_element(&interfaces, iface, node) {
 535                 if (iface->available && iface->autostart)
 536                         interface_set_up(iface);
 537         }
 538 }
 539
 540 static void
 541 set_config_state(struct interface *iface, enum interface_config_state s)
 542 {
 543         iface->config_state = s;
 544         if (iface->state == IFS_DOWN)
 545                 interface_handle_config_change(iface);
 546         else
 547                 __interface_set_down(iface, false);
 548 }
 549
 550 void
 551 interface_update_start(struct interface *iface)
 552 {
 553         interface_ip_update_start(&iface->proto_ip);
 554 }
 555
 556 void
 557 interface_update_complete(struct interface *iface)
 558 {
 559         interface_ip_update_complete(&iface->proto_ip);
 560 }
 561
 562 static void
 563 interface_change_config(struct interface *if_old, struct interface *if_new)
 564 {
 565         struct blob_attr *old_config = if_old->config;
 566         const char *old_ifname = if_old->ifname;
 567         const struct proto_handler *proto = if_old->proto_handler;
 568
 569         interface_clear_errors(if_old);
 570         if_old->config = if_new->config;
 571         if (!if_old->config_autostart && if_new->config_autostart)
 572                 if_old->autostart = true;
 573
 574         if_old->config_autostart = if_new->config_autostart;
 575         if_old->ifname = if_new->ifname;
 576         if_old->proto_handler = if_new->proto_handler;
 577
 578         if ((!!old_ifname != !!if_new->ifname) ||
 579             (old_ifname && strcmp(old_ifname, if_new->ifname) != 0) ||
 580             proto != if_new->proto_handler) {
 581                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 582                   if_old->name);
 583                 goto reload;
 584         }
 585
 586         if (!proto->config_params)
 587                 D(INTERFACE, "No config parameters for interface '%s'\n",
 588                   if_old->name);
 589         else if (!config_check_equal(old_config, if_new->config,
 590                                 proto->config_params)) {
 591                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 592                   if_old->name);
 593                 goto reload;
 594         }
 595
 596 #define UPDATE(field) ({                                                \
 597                 bool __changed = (if_old->field != if_new->field);      \
 598                 if_old->field = if_new->field;                          \
 599                 __changed;                                              \
 600         })
 601
 602         if (UPDATE(metric) || UPDATE(proto_ip.no_defaultroute)) {
 603                 interface_ip_set_enabled(&if_old->config_ip, false);
 604                 interface_ip_set_enabled(&if_old->config_ip, if_new->config_ip.enabled);
 605                 interface_ip_set_enabled(&if_old->proto_ip, false);
 606                 interface_ip_set_enabled(&if_old->proto_ip, if_new->proto_ip.enabled);
 607         }
 608
 609 #undef UPDATE
 610
 611         goto out;
 612
 613 reload:
 614         set_config_state(if_old, IFC_RELOAD);
 615 out:
 616         free(old_config);
 617         free(if_new);
 618 }
 619
 620 static void
 621 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 622                  struct vlist_node *node_old)
 623 {
 624         struct interface *if_old = container_of(node_old, struct interface, node);
 625         struct interface *if_new = container_of(node_new, struct interface, node);
 626
 627         if (node_old && node_new) {
 628                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 629                 interface_change_config(if_old, if_new);
 630         } else if (node_old) {
 631                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 632                 set_config_state(if_old, IFC_REMOVE);
 633         } else if (node_new) {
 634                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 635                 proto_init_interface(if_new, if_new->config);
 636                 interface_claim_device(if_new);
 637                 netifd_ubus_add_interface(if_new);
 638         }
 639 }
 640
 641
 642 static void __init
 643 interface_init_list(void)
 644 {
 645         vlist_init(&interfaces, avl_strcmp, interface_update);
 646         interfaces.keep_old = true;
 647         interfaces.no_delete = true;
 648 }