device.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17 #include <assert.h>
  18
  19 #include <sys/types.h>
  20 #include <sys/socket.h>
  21 #include <net/ethernet.h>
  22
  23 #ifdef linux
  24 #include <netinet/ether.h>
  25 #endif
  26
  27 #include "netifd.h"
  28 #include "system.h"
  29 #include "config.h"
  30
  31 static struct avl_tree devices;
  32
  33 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  34         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  35         [DEV_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_ARRAY },
  36         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  38         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  39         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  40         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  41         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  42         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  43 };
  44
  45 const struct uci_blob_param_list device_attr_list = {
  46         .n_params = __DEV_ATTR_MAX,
  47         .params = dev_attrs,
  48 };
  49
  50 static int __devlock = 0;
  51
  52 void device_lock(void)
  53 {
  54         __devlock++;
  55 }
  56
  57 void device_unlock(void)
  58 {
  59         __devlock--;
  60         if (!__devlock)
  61                 device_free_unused(NULL);
  62 }
  63
  64 static int set_device_state(struct device *dev, bool state)
  65 {
  66         if (state) {
  67                 /* Set ifindex for all devices being enabled so a valid  */
  68                 /* ifindex is in place avoiding possible race conditions */
  69                 device_set_ifindex(dev, system_if_resolve(dev));
  70                 if (!dev->ifindex)
  71                         return -1;
  72         }
  73
  74         if (dev->external)
  75                 return 0;
  76
  77         if (state)
  78                 system_if_up(dev);
  79         else
  80                 system_if_down(dev);
  81
  82         return 0;
  83 }
  84
  85 static int
  86 simple_device_set_state(struct device *dev, bool state)
  87 {
  88         struct device *pdev;
  89         int ret = 0;
  90
  91         pdev = dev->parent.dev;
  92         if (state && !pdev) {
  93                 pdev = system_if_get_parent(dev);
  94                 if (pdev)
  95                         device_add_user(&dev->parent, pdev);
  96         }
  97
  98         if (pdev) {
  99                 if (state)
 100                         ret = device_claim(&dev->parent);
 101                 else
 102                         device_release(&dev->parent);
 103
 104                 if (ret < 0)
 105                         return ret;
 106         }
 107         return set_device_state(dev, state);
 108 }
 109
 110 static struct device *
 111 simple_device_create(const char *name, struct blob_attr *attr)
 112 {
 113         struct blob_attr *tb[__DEV_ATTR_MAX];
 114         struct device *dev = NULL;
 115
 116         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 117         dev = device_get(name, true);
 118         if (!dev)
 119                 return NULL;
 120
 121         dev->set_state = simple_device_set_state;
 122         device_init_settings(dev, tb);
 123
 124         return dev;
 125 }
 126
 127 static void simple_device_free(struct device *dev)
 128 {
 129         if (dev->parent.dev)
 130                 device_remove_user(&dev->parent);
 131         free(dev);
 132 }
 133
 134 const struct device_type simple_device_type = {
 135         .name = "Network device",
 136         .config_params = &device_attr_list,
 137
 138         .create = simple_device_create,
 139         .check_state = system_if_check,
 140         .free = simple_device_free,
 141 };
 142
 143 static void
 144 device_merge_settings(struct device *dev, struct device_settings *n)
 145 {
 146         struct device_settings *os = &dev->orig_settings;
 147         struct device_settings *s = &dev->settings;
 148
 149         memset(n, 0, sizeof(*n));
 150         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 151         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 152                 s->txqueuelen : os->txqueuelen;
 153         memcpy(n->macaddr,
 154                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 155                 sizeof(n->macaddr));
 156         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 157         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 158         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 159         n->flags = s->flags | os->flags;
 160 }
 161
 162 void
 163 device_init_settings(struct device *dev, struct blob_attr **tb)
 164 {
 165         struct device_settings *s = &dev->settings;
 166         struct blob_attr *cur;
 167         struct ether_addr *ea;
 168         bool disabled = false;
 169
 170         s->flags = 0;
 171         if ((cur = tb[DEV_ATTR_ENABLED]))
 172                 disabled = !blobmsg_get_bool(cur);
 173
 174         if ((cur = tb[DEV_ATTR_MTU])) {
 175                 s->mtu = blobmsg_get_u32(cur);
 176                 s->flags |= DEV_OPT_MTU;
 177         }
 178
 179         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 180                 s->txqueuelen = blobmsg_get_u32(cur);
 181                 s->flags |= DEV_OPT_TXQUEUELEN;
 182         }
 183
 184         if ((cur = tb[DEV_ATTR_MACADDR])) {
 185                 ea = ether_aton(blobmsg_data(cur));
 186                 if (ea) {
 187                         memcpy(s->macaddr, ea, 6);
 188                         s->flags |= DEV_OPT_MACADDR;
 189                 }
 190         }
 191
 192         if ((cur = tb[DEV_ATTR_IPV6])) {
 193                 s->ipv6 = blobmsg_get_bool(cur);
 194                 s->flags |= DEV_OPT_IPV6;
 195         }
 196
 197         if ((cur = tb[DEV_ATTR_PROMISC])) {
 198                 s->promisc = blobmsg_get_bool(cur);
 199                 s->flags |= DEV_OPT_PROMISC;
 200         }
 201
 202         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 203                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 204                         s->flags |= DEV_OPT_RPFILTER;
 205                 else
 206                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 207         }
 208
 209         device_set_disabled(dev, disabled);
 210 }
 211
 212 static void __init dev_init(void)
 213 {
 214         avl_init(&devices, avl_strcmp, true, NULL);
 215 }
 216
 217 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 218 {
 219         struct device_user *dep = container_of(list, struct device_user, list);
 220         int *ev = ctx;
 221
 222         /* device might have been removed by an earlier callback */
 223         if (!dep->dev)
 224                 return 0;
 225
 226         if (dep->cb)
 227                 dep->cb(dep, *ev);
 228         return 0;
 229 }
 230
 231 void device_broadcast_event(struct device *dev, enum device_event ev)
 232 {
 233         int dev_ev = ev;
 234
 235         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 236         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 237 }
 238
 239 int device_claim(struct device_user *dep)
 240 {
 241         struct device *dev = dep->dev;
 242         int ret;
 243
 244         if (dep->claimed)
 245                 return 0;
 246
 247         dep->claimed = true;
 248         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 249         if (++dev->active != 1)
 250                 return 0;
 251
 252         device_broadcast_event(dev, DEV_EVENT_SETUP);
 253         ret = dev->set_state(dev, true);
 254         if (ret == 0)
 255                 device_broadcast_event(dev, DEV_EVENT_UP);
 256         else {
 257                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 258                 dev->active = 0;
 259                 dep->claimed = false;
 260         }
 261
 262         return ret;
 263 }
 264
 265 void device_release(struct device_user *dep)
 266 {
 267         struct device *dev = dep->dev;
 268
 269         if (!dep->claimed)
 270                 return;
 271
 272         dep->claimed = false;
 273         dev->active--;
 274         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 275         assert(dev->active >= 0);
 276
 277         if (dev->active)
 278                 return;
 279
 280         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 281         if (!dev->external)
 282                 dev->set_state(dev, false);
 283         device_broadcast_event(dev, DEV_EVENT_DOWN);
 284 }
 285
 286 int device_check_state(struct device *dev)
 287 {
 288         if (!dev->type->check_state)
 289                 return simple_device_type.check_state(dev);
 290
 291         return dev->type->check_state(dev);
 292 }
 293
 294 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 295 {
 296         assert(dev);
 297         assert(type);
 298
 299         if (name)
 300                 strncpy(dev->ifname, name, IFNAMSIZ);
 301
 302         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 303         INIT_SAFE_LIST(&dev->users);
 304         INIT_SAFE_LIST(&dev->aliases);
 305         dev->type = type;
 306
 307         if (!dev->set_state)
 308                 dev->set_state = set_device_state;
 309 }
 310
 311 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 312 {
 313         int ret;
 314
 315         device_init_virtual(dev, type, ifname);
 316
 317         dev->avl.key = dev->ifname;
 318
 319         ret = avl_insert(&devices, &dev->avl);
 320         if (ret < 0)
 321                 return ret;
 322
 323         system_if_clear_state(dev);
 324         device_check_state(dev);
 325
 326         return 0;
 327 }
 328
 329 static struct device *
 330 device_create_default(const char *name, bool external)
 331 {
 332         struct device *dev;
 333
 334         if (!external && system_if_force_external(name))
 335                 return NULL;
 336
 337         D(DEVICE, "Create simple device '%s'\n", name);
 338         dev = calloc(1, sizeof(*dev));
 339         dev->external = external;
 340         dev->set_state = simple_device_set_state;
 341         device_init(dev, &simple_device_type, name);
 342         dev->default_config = true;
 343         return dev;
 344 }
 345
 346 struct device *
 347 device_get(const char *name, int create)
 348 {
 349         struct device *dev;
 350
 351         if (strchr(name, '.'))
 352                 return get_vlan_device_chain(name, create);
 353
 354         if (name[0] == '@')
 355                 return device_alias_get(name + 1);
 356
 357         dev = avl_find_element(&devices, name, dev, avl);
 358         if (dev) {
 359                 if (create > 1 && !dev->external) {
 360                         dev->external = true;
 361                         device_set_present(dev, true);
 362                 }
 363                 return dev;
 364         }
 365
 366         if (!create)
 367                 return NULL;
 368
 369         return device_create_default(name, create > 1);
 370 }
 371
 372 static void
 373 device_delete(struct device *dev)
 374 {
 375         if (!dev->avl.key)
 376                 return;
 377
 378         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 379         avl_delete(&devices, &dev->avl);
 380         dev->avl.key = NULL;
 381 }
 382
 383 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 384 {
 385         struct device_user *dep = container_of(list, struct device_user, list);
 386         if (dep->cb)
 387                 dep->cb(dep, DEV_EVENT_REMOVE);
 388
 389         device_release(dep);
 390         return 0;
 391 }
 392
 393 void device_cleanup(struct device *dev)
 394 {
 395         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 396         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 397         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 398         device_delete(dev);
 399 }
 400
 401 static void __device_set_present(struct device *dev, bool state)
 402 {
 403         if (dev->present == state)
 404                 return;
 405
 406         dev->present = state;
 407         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 408 }
 409
 410 void
 411 device_refresh_present(struct device *dev)
 412 {
 413         bool state = dev->sys_present;
 414
 415         if (dev->disabled || dev->deferred)
 416                 state = false;
 417
 418         __device_set_present(dev, state);
 419 }
 420
 421 void device_set_present(struct device *dev, bool state)
 422 {
 423         if (dev->sys_present == state)
 424                 return;
 425
 426         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 427         dev->sys_present = state;
 428         device_refresh_present(dev);
 429 }
 430
 431 void device_set_link(struct device *dev, bool state)
 432 {
 433         if (dev->link_active == state)
 434                 return;
 435
 436         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 437
 438         dev->link_active = state;
 439         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 440 }
 441
 442 void device_set_ifindex(struct device *dev, int ifindex)
 443 {
 444         if (dev->ifindex == ifindex)
 445                 return;
 446
 447         dev->ifindex = ifindex;
 448         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 449 }
 450
 451 static int device_refcount(struct device *dev)
 452 {
 453         struct list_head *list;
 454         int count = 0;
 455
 456         list_for_each(list, &dev->users.list)
 457                 count++;
 458
 459         list_for_each(list, &dev->aliases.list)
 460                 count++;
 461
 462         return count;
 463 }
 464
 465 void device_add_user(struct device_user *dep, struct device *dev)
 466 {
 467         struct safe_list *head;
 468
 469         if (dep->dev == dev)
 470                 return;
 471
 472         if (dep->dev)
 473                 device_remove_user(dep);
 474
 475         if (!dev)
 476                 return;
 477
 478         dep->dev = dev;
 479
 480         if (dep->alias)
 481                 head = &dev->aliases;
 482         else
 483                 head = &dev->users;
 484
 485         safe_list_add(&dep->list, head);
 486         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 487
 488         if (dep->cb && dev->present) {
 489                 dep->cb(dep, DEV_EVENT_ADD);
 490                 if (dev->active)
 491                         dep->cb(dep, DEV_EVENT_UP);
 492
 493                 if (dev->link_active)
 494                         dep->cb(dep, DEV_EVENT_LINK_UP);
 495         }
 496 }
 497
 498 void
 499 device_free(struct device *dev)
 500 {
 501         __devlock++;
 502         free(dev->config);
 503         device_cleanup(dev);
 504         dev->type->free(dev);
 505         __devlock--;
 506 }
 507
 508 static void
 509 __device_free_unused(struct device *dev)
 510 {
 511         if (!safe_list_empty(&dev->users) ||
 512                 !safe_list_empty(&dev->aliases) ||
 513             dev->current_config || __devlock)
 514                 return;
 515
 516         device_free(dev);
 517 }
 518
 519 void device_remove_user(struct device_user *dep)
 520 {
 521         struct device *dev = dep->dev;
 522
 523         if (!dep->dev)
 524                 return;
 525
 526         dep->hotplug = false;
 527         if (dep->claimed)
 528                 device_release(dep);
 529
 530         safe_list_del(&dep->list);
 531         dep->dev = NULL;
 532         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 533         __device_free_unused(dev);
 534 }
 535
 536 void
 537 device_free_unused(struct device *dev)
 538 {
 539         struct device *tmp;
 540
 541         if (dev)
 542                 return __device_free_unused(dev);
 543
 544         avl_for_each_element_safe(&devices, dev, avl, tmp)
 545                 __device_free_unused(dev);
 546 }
 547
 548 void
 549 device_init_pending(void)
 550 {
 551         struct device *dev, *tmp;
 552
 553         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 554                 if (!dev->config_pending)
 555                         continue;
 556
 557                 dev->type->config_init(dev);
 558                 dev->config_pending = false;
 559         }
 560 }
 561
 562 static enum dev_change_type
 563 device_reload_config(struct device *dev, struct blob_attr *attr)
 564 {
 565         struct blob_attr *tb[__DEV_ATTR_MAX];
 566         const struct uci_blob_param_list *cfg = dev->type->config_params;
 567
 568         if (uci_blob_check_equal(dev->config, attr, cfg))
 569                 return DEV_CONFIG_NO_CHANGE;
 570
 571         if (cfg == &device_attr_list) {
 572                 memset(tb, 0, sizeof(tb));
 573
 574                 if (attr)
 575                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 576                                 blob_data(attr), blob_len(attr));
 577
 578                 device_init_settings(dev, tb);
 579                 return DEV_CONFIG_RESTART;
 580         } else
 581                 return DEV_CONFIG_RECREATE;
 582 }
 583
 584 enum dev_change_type
 585 device_set_config(struct device *dev, const struct device_type *type,
 586                   struct blob_attr *attr)
 587 {
 588         if (type != dev->type)
 589                 return DEV_CONFIG_RECREATE;
 590
 591         if (dev->type->reload)
 592                 return dev->type->reload(dev, attr);
 593
 594         return device_reload_config(dev, attr);
 595 }
 596
 597 static void
 598 device_replace(struct device *dev, struct device *odev)
 599 {
 600         struct device_user *dep, *tmp;
 601         bool present = odev->present;
 602
 603         if (present)
 604                 device_set_present(odev, false);
 605
 606         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 607                 device_release(dep);
 608                 safe_list_del(&dep->list);
 609                 safe_list_add(&dep->list, &dev->users);
 610                 dep->dev = dev;
 611         }
 612         device_free(odev);
 613
 614         if (present)
 615                 device_set_present(dev, true);
 616 }
 617
 618 void
 619 device_reset_config(void)
 620 {
 621         struct device *dev;
 622
 623         avl_for_each_element(&devices, dev, avl)
 624                 dev->current_config = false;
 625 }
 626
 627 void
 628 device_reset_old(void)
 629 {
 630         struct device *dev, *tmp, *ndev;
 631
 632         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 633                 if (dev->current_config || dev->default_config)
 634                         continue;
 635
 636                 if (dev->type != &simple_device_type)
 637                         continue;
 638
 639                 ndev = device_create_default(dev->ifname, dev->external);
 640                 device_replace(ndev, dev);
 641         }
 642 }
 643
 644 struct device *
 645 device_create(const char *name, const struct device_type *type,
 646               struct blob_attr *config)
 647 {
 648         struct device *odev = NULL, *dev;
 649         enum dev_change_type change;
 650
 651         config = blob_memdup(config);
 652         if (!config)
 653                 return NULL;
 654
 655         odev = device_get(name, false);
 656         if (odev) {
 657                 odev->current_config = true;
 658                 change = device_set_config(odev, type, config);
 659                 if (odev->external) {
 660                         system_if_apply_settings(odev, &odev->settings, odev->settings.flags);
 661                         change = DEV_CONFIG_APPLIED;
 662                 }
 663                 switch (change) {
 664                 case DEV_CONFIG_RESTART:
 665                 case DEV_CONFIG_APPLIED:
 666                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 667                         free(odev->config);
 668                         odev->config = config;
 669                         if (change == DEV_CONFIG_RESTART && odev->present) {
 670                                 device_set_present(odev, false);
 671                                 device_set_present(odev, true);
 672                         }
 673                         return odev;
 674                 case DEV_CONFIG_NO_CHANGE:
 675                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 676                         free(config);
 677                         return odev;
 678                 case DEV_CONFIG_RECREATE:
 679                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 680                         device_delete(odev);
 681                         break;
 682                 }
 683         } else
 684                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 685
 686         dev = type->create(name, config);
 687         if (!dev)
 688                 return NULL;
 689
 690         dev->current_config = true;
 691         dev->config = config;
 692         if (odev)
 693                 device_replace(dev, odev);
 694
 695         if (!config_init && dev->config_pending)
 696                 type->config_init(dev);
 697
 698         return dev;
 699 }
 700
 701 void
 702 device_dump_status(struct blob_buf *b, struct device *dev)
 703 {
 704         struct device_settings st;
 705         void *c, *s;
 706
 707         if (!dev) {
 708                 avl_for_each_element(&devices, dev, avl) {
 709                         if (!dev->present)
 710                                 continue;
 711                         c = blobmsg_open_table(b, dev->ifname);
 712                         device_dump_status(b, dev);
 713                         blobmsg_close_table(b, c);
 714                 }
 715
 716                 return;
 717         }
 718
 719         blobmsg_add_u8(b, "external", dev->external);
 720         blobmsg_add_u8(b, "present", dev->present);
 721         blobmsg_add_string(b, "type", dev->type->name);
 722
 723         if (!dev->present)
 724                 return;
 725
 726         blobmsg_add_u8(b, "up", !!dev->active);
 727         blobmsg_add_u8(b, "carrier", !!dev->link_active);
 728
 729         if (dev->type->dump_info)
 730                 dev->type->dump_info(dev, b);
 731         else
 732                 system_if_dump_info(dev, b);
 733
 734         if (dev->active) {
 735                 device_merge_settings(dev, &st);
 736                 if (st.flags & DEV_OPT_MTU)
 737                         blobmsg_add_u32(b, "mtu", st.mtu);
 738                 if (st.flags & DEV_OPT_MACADDR)
 739                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
 740                 if (st.flags & DEV_OPT_TXQUEUELEN)
 741                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
 742                 if (st.flags & DEV_OPT_IPV6)
 743                         blobmsg_add_u8(b, "ipv6", st.ipv6);
 744                 if (st.flags & DEV_OPT_PROMISC)
 745                         blobmsg_add_u8(b, "promisc", st.promisc);
 746                 if (st.flags & DEV_OPT_RPFILTER)
 747                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
 748         }
 749
 750         s = blobmsg_open_table(b, "statistics");
 751         if (dev->type->dump_stats)
 752                 dev->type->dump_stats(dev, b);
 753         else
 754                 system_if_dump_stats(dev, b);
 755         blobmsg_close_table(b, s);
 756 }