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