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 <libubox/list.h>
  28
  29 #include "netifd.h"
  30 #include "system.h"
  31 #include "config.h"
  32
  33 static struct list_head devtypes = LIST_HEAD_INIT(devtypes);
  34 static struct avl_tree devices;
  35 static bool default_ps = true;
  36
  37 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  38         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  39         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  40         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  41         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  42         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  43         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  44         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  45         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  46         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  47         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  48         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  49         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  50         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  51         [DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  52         [DEV_ATTR_RPS] = { .name = "rps", .type = BLOBMSG_TYPE_BOOL },
  53         [DEV_ATTR_XPS] = { .name = "xps", .type = BLOBMSG_TYPE_BOOL },
  54         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  55         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  56         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  57         [DEV_ATTR_MULTICAST_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
  58         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  59         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  60         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  61 };
  62
  63 const struct uci_blob_param_list device_attr_list = {
  64         .n_params = __DEV_ATTR_MAX,
  65         .params = dev_attrs,
  66 };
  67
  68 static int __devlock = 0;
  69
  70 int device_type_add(struct device_type *devtype)
  71 {
  72         if (device_type_get(devtype->name)) {
  73                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  74                                    devtype->name);
  75                 return 1;
  76         }
  77
  78         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  79                 devtype->name);
  80
  81         list_add(&devtype->list, &devtypes);
  82         return 0;
  83 }
  84
  85 /* Retrieve the device type for the given name. If 'bridge' is true, the type
  86  * must have bridge capabilities
  87  */
  88 struct device_type *
  89 device_type_get(const char *tname)
  90 {
  91         struct device_type *cur;
  92
  93         list_for_each_entry(cur, &devtypes, list)
  94                 if (!strcmp(cur->name, tname))
  95                         return cur;
  96
  97         return NULL;
  98 }
  99
 100 void device_lock(void)
 101 {
 102         __devlock++;
 103 }
 104
 105 void device_unlock(void)
 106 {
 107         __devlock--;
 108         if (!__devlock)
 109                 device_free_unused(NULL);
 110 }
 111
 112 static int set_device_state(struct device *dev, bool state)
 113 {
 114         if (state) {
 115                 /* Get ifindex for all devices being enabled so a valid  */
 116                 /* ifindex is in place avoiding possible race conditions */
 117                 device_set_ifindex(dev, system_if_resolve(dev));
 118                 if (!dev->ifindex)
 119                         return -1;
 120
 121                 system_if_up(dev);
 122         }
 123         else
 124                 system_if_down(dev);
 125
 126         return 0;
 127 }
 128
 129 static int
 130 simple_device_set_state(struct device *dev, bool state)
 131 {
 132         struct device *pdev;
 133         int ret = 0;
 134
 135         pdev = dev->parent.dev;
 136         if (state && !pdev) {
 137                 pdev = system_if_get_parent(dev);
 138                 if (pdev)
 139                         device_add_user(&dev->parent, pdev);
 140         }
 141
 142         if (pdev) {
 143                 if (state)
 144                         ret = device_claim(&dev->parent);
 145                 else
 146                         device_release(&dev->parent);
 147
 148                 if (ret < 0)
 149                         return ret;
 150         }
 151         return set_device_state(dev, state);
 152 }
 153
 154 static struct device *
 155 simple_device_create(const char *name, struct device_type *devtype,
 156                      struct blob_attr *attr)
 157 {
 158         struct blob_attr *tb[__DEV_ATTR_MAX];
 159         struct device *dev = NULL;
 160
 161         /* device type is unused for simple devices */
 162         devtype = NULL;
 163
 164         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 165         dev = device_get(name, true);
 166         if (!dev)
 167                 return NULL;
 168
 169         dev->set_state = simple_device_set_state;
 170         device_init_settings(dev, tb);
 171
 172         return dev;
 173 }
 174
 175 static void simple_device_free(struct device *dev)
 176 {
 177         if (dev->parent.dev)
 178                 device_remove_user(&dev->parent);
 179         free(dev);
 180 }
 181
 182 struct device_type simple_device_type = {
 183         .name = "Network device",
 184         .config_params = &device_attr_list,
 185
 186         .create = simple_device_create,
 187         .check_state = system_if_check,
 188         .free = simple_device_free,
 189 };
 190
 191 static void
 192 device_merge_settings(struct device *dev, struct device_settings *n)
 193 {
 194         struct device_settings *os = &dev->orig_settings;
 195         struct device_settings *s = &dev->settings;
 196
 197         memset(n, 0, sizeof(*n));
 198         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 199         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 200         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 201                 s->txqueuelen : os->txqueuelen;
 202         memcpy(n->macaddr,
 203                 (s->flags & DEV_OPT_MACADDR ? s->macaddr : os->macaddr),
 204                 sizeof(n->macaddr));
 205         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 206         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 207         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 208         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 209         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 210         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 211         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 212                 s->neigh4reachabletime : os->neigh4reachabletime;
 213         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 214                 s->neigh6reachabletime : os->neigh6reachabletime;
 215         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 216                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 217         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 218                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 219         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 220                 s->dadtransmits : os->dadtransmits;
 221         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 222                 s->multicast : os->multicast;
 223         n->multicast_to_unicast = s->multicast_to_unicast;
 224         n->multicast_router = s->multicast_router;
 225         n->multicast_fast_leave = s->multicast_fast_leave;
 226         n->learning = s->learning;
 227         n->unicast_flood = s->unicast_flood;
 228         n->flags = s->flags | os->flags | os->valid_flags;
 229 }
 230
 231 void
 232 device_init_settings(struct device *dev, struct blob_attr **tb)
 233 {
 234         struct device_settings *s = &dev->settings;
 235         struct blob_attr *cur;
 236         struct ether_addr *ea;
 237         bool disabled = false;
 238
 239         s->flags = 0;
 240         if ((cur = tb[DEV_ATTR_ENABLED]))
 241                 disabled = !blobmsg_get_bool(cur);
 242
 243         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 244                 s->mtu = blobmsg_get_u32(cur);
 245                 s->flags |= DEV_OPT_MTU;
 246         }
 247
 248         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 249                 s->mtu6 = blobmsg_get_u32(cur);
 250                 s->flags |= DEV_OPT_MTU6;
 251         }
 252
 253         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 254                 s->txqueuelen = blobmsg_get_u32(cur);
 255                 s->flags |= DEV_OPT_TXQUEUELEN;
 256         }
 257
 258         if ((cur = tb[DEV_ATTR_MACADDR])) {
 259                 ea = ether_aton(blobmsg_data(cur));
 260                 if (ea) {
 261                         memcpy(s->macaddr, ea, 6);
 262                         s->flags |= DEV_OPT_MACADDR;
 263                 }
 264         }
 265
 266         if ((cur = tb[DEV_ATTR_IPV6])) {
 267                 s->ipv6 = blobmsg_get_bool(cur);
 268                 s->flags |= DEV_OPT_IPV6;
 269         }
 270
 271         if ((cur = tb[DEV_ATTR_PROMISC])) {
 272                 s->promisc = blobmsg_get_bool(cur);
 273                 s->flags |= DEV_OPT_PROMISC;
 274         }
 275
 276         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 277                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 278                         s->flags |= DEV_OPT_RPFILTER;
 279                 else
 280                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 281         }
 282
 283         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 284                 s->acceptlocal = blobmsg_get_bool(cur);
 285                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 286         }
 287
 288         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 289                 s->igmpversion = blobmsg_get_u32(cur);
 290                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 291                         s->flags |= DEV_OPT_IGMPVERSION;
 292                 else
 293                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 294         }
 295
 296         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 297                 s->mldversion = blobmsg_get_u32(cur);
 298                 if (s->mldversion >= 1 && s->mldversion <= 2)
 299                         s->flags |= DEV_OPT_MLDVERSION;
 300                 else
 301                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 302         }
 303
 304         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 305                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 306                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 307         }
 308
 309         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 310                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 311                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 312         }
 313
 314         if ((cur = tb[DEV_ATTR_RPS])) {
 315                 s->rps = blobmsg_get_bool(cur);
 316                 s->flags |= DEV_OPT_RPS;
 317         }
 318         else
 319                 s->rps = default_ps;
 320
 321         if ((cur = tb[DEV_ATTR_XPS])) {
 322                 s->xps = blobmsg_get_bool(cur);
 323                 s->flags |= DEV_OPT_XPS;
 324         }
 325         else
 326                 s->xps = default_ps;
 327
 328         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 329                 s->dadtransmits = blobmsg_get_u32(cur);
 330                 s->flags |= DEV_OPT_DADTRANSMITS;
 331         }
 332
 333         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 334                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 335                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 336         }
 337
 338         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 339                 s->multicast_router = blobmsg_get_u32(cur);
 340                 if (s->multicast_router <= 2)
 341                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 342                 else
 343                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 344         }
 345
 346         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 347                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 348                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 349         }
 350
 351         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 352                 s->multicast = blobmsg_get_bool(cur);
 353                 s->flags |= DEV_OPT_MULTICAST;
 354         }
 355
 356         if ((cur = tb[DEV_ATTR_LEARNING])) {
 357                 s->learning = blobmsg_get_bool(cur);
 358                 s->flags |= DEV_OPT_LEARNING;
 359         }
 360
 361         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 362                 s->unicast_flood = blobmsg_get_bool(cur);
 363                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 364         }
 365
 366         device_set_disabled(dev, disabled);
 367 }
 368
 369 static void __init dev_init(void)
 370 {
 371         avl_init(&devices, avl_strcmp, true, NULL);
 372 }
 373
 374 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 375 {
 376         struct device_user *dep = container_of(list, struct device_user, list);
 377         int *ev = ctx;
 378
 379         /* device might have been removed by an earlier callback */
 380         if (!dep->dev)
 381                 return 0;
 382
 383         if (dep->cb)
 384                 dep->cb(dep, *ev);
 385         return 0;
 386 }
 387
 388 void device_broadcast_event(struct device *dev, enum device_event ev)
 389 {
 390         int dev_ev = ev;
 391
 392         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 393         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 394 }
 395
 396 int device_claim(struct device_user *dep)
 397 {
 398         struct device *dev = dep->dev;
 399         int ret = 0;
 400
 401         if (dep->claimed)
 402                 return 0;
 403
 404         if (!dev)
 405                 return -1;
 406
 407         dep->claimed = true;
 408         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 409         if (++dev->active != 1)
 410                 return 0;
 411
 412         device_broadcast_event(dev, DEV_EVENT_SETUP);
 413         if (dev->external) {
 414                 /* Get ifindex for external claimed devices so a valid   */
 415                 /* ifindex is in place avoiding possible race conditions */
 416                 device_set_ifindex(dev, system_if_resolve(dev));
 417                 if (!dev->ifindex)
 418                         ret = -1;
 419
 420                 system_if_get_settings(dev, &dev->orig_settings);
 421         } else
 422                 ret = dev->set_state(dev, true);
 423
 424         if (ret == 0)
 425                 device_broadcast_event(dev, DEV_EVENT_UP);
 426         else {
 427                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 428                 dev->active = 0;
 429                 dep->claimed = false;
 430         }
 431
 432         return ret;
 433 }
 434
 435 void device_release(struct device_user *dep)
 436 {
 437         struct device *dev = dep->dev;
 438
 439         if (!dep->claimed)
 440                 return;
 441
 442         dep->claimed = false;
 443         dev->active--;
 444         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 445         assert(dev->active >= 0);
 446
 447         if (dev->active)
 448                 return;
 449
 450         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 451         if (!dev->external)
 452                 dev->set_state(dev, false);
 453
 454         if (dev->active)
 455                 return;
 456
 457         device_broadcast_event(dev, DEV_EVENT_DOWN);
 458 }
 459
 460 int device_check_state(struct device *dev)
 461 {
 462         if (!dev->type->check_state)
 463                 return simple_device_type.check_state(dev);
 464
 465         return dev->type->check_state(dev);
 466 }
 467
 468 void device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 469 {
 470         assert(dev);
 471         assert(type);
 472
 473         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 474         INIT_SAFE_LIST(&dev->users);
 475         INIT_SAFE_LIST(&dev->aliases);
 476         dev->type = type;
 477
 478         if (name)
 479                 device_set_ifname(dev, name);
 480
 481         if (!dev->set_state)
 482                 dev->set_state = set_device_state;
 483 }
 484
 485 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 486 {
 487         int ret;
 488
 489         device_init_virtual(dev, type, ifname);
 490
 491         dev->avl.key = dev->ifname;
 492
 493         ret = avl_insert(&devices, &dev->avl);
 494         if (ret < 0)
 495                 return ret;
 496
 497         system_if_clear_state(dev);
 498         device_check_state(dev);
 499         dev->settings.rps = default_ps;
 500         dev->settings.xps = default_ps;
 501
 502         return 0;
 503 }
 504
 505 static struct device *
 506 device_create_default(const char *name, bool external)
 507 {
 508         struct device *dev;
 509
 510         if (!external && system_if_force_external(name))
 511                 return NULL;
 512
 513         D(DEVICE, "Create simple device '%s'\n", name);
 514         dev = calloc(1, sizeof(*dev));
 515         if (!dev)
 516                 return NULL;
 517
 518         dev->external = external;
 519         dev->set_state = simple_device_set_state;
 520         device_init(dev, &simple_device_type, name);
 521         dev->default_config = true;
 522         if (external)
 523                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 524         return dev;
 525 }
 526
 527 struct device *
 528 device_find(const char *name)
 529 {
 530         struct device *dev;
 531
 532         return avl_find_element(&devices, name, dev, avl);
 533 }
 534
 535 struct device *
 536 device_get(const char *name, int create)
 537 {
 538         struct device *dev;
 539
 540         if (strchr(name, '.'))
 541                 return get_vlan_device_chain(name, create);
 542
 543         if (name[0] == '@')
 544                 return device_alias_get(name + 1);
 545
 546         dev = avl_find_element(&devices, name, dev, avl);
 547         if (dev) {
 548                 if (create > 1 && !dev->external) {
 549                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 550                         dev->external = true;
 551                         device_set_present(dev, true);
 552                 }
 553                 return dev;
 554         }
 555
 556         if (!create)
 557                 return NULL;
 558
 559         return device_create_default(name, create > 1);
 560 }
 561
 562 static void
 563 device_delete(struct device *dev)
 564 {
 565         if (!dev->avl.key)
 566                 return;
 567
 568         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 569         avl_delete(&devices, &dev->avl);
 570         dev->avl.key = NULL;
 571 }
 572
 573 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 574 {
 575         struct device_user *dep = container_of(list, struct device_user, list);
 576         if (dep->cb)
 577                 dep->cb(dep, DEV_EVENT_REMOVE);
 578
 579         device_release(dep);
 580         return 0;
 581 }
 582
 583 void device_cleanup(struct device *dev)
 584 {
 585         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 586         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 587         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 588         device_delete(dev);
 589 }
 590
 591 static void __device_set_present(struct device *dev, bool state)
 592 {
 593         if (dev->present == state)
 594                 return;
 595
 596         dev->present = state;
 597         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 598 }
 599
 600 void
 601 device_refresh_present(struct device *dev)
 602 {
 603         bool state = dev->sys_present;
 604
 605         if (dev->disabled || dev->deferred)
 606                 state = false;
 607
 608         __device_set_present(dev, state);
 609 }
 610
 611 void device_set_present(struct device *dev, bool state)
 612 {
 613         if (dev->sys_present == state)
 614                 return;
 615
 616         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 617         dev->sys_present = state;
 618         device_refresh_present(dev);
 619 }
 620
 621 void device_set_link(struct device *dev, bool state)
 622 {
 623         if (dev->link_active == state)
 624                 return;
 625
 626         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 627
 628         dev->link_active = state;
 629         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 630 }
 631
 632 void device_set_ifindex(struct device *dev, int ifindex)
 633 {
 634         if (dev->ifindex == ifindex)
 635                 return;
 636
 637         dev->ifindex = ifindex;
 638         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 639 }
 640
 641 int device_set_ifname(struct device *dev, const char *name)
 642 {
 643         int ret = 0;
 644
 645         if (!strcmp(dev->ifname, name))
 646                 return 0;
 647
 648         if (dev->avl.key)
 649                 avl_delete(&devices, &dev->avl);
 650
 651         strncpy(dev->ifname, name, IFNAMSIZ);
 652
 653         if (dev->avl.key)
 654                 ret = avl_insert(&devices, &dev->avl);
 655
 656         if (ret == 0)
 657                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 658
 659         return ret;
 660 }
 661
 662 static int device_refcount(struct device *dev)
 663 {
 664         struct list_head *list;
 665         int count = 0;
 666
 667         list_for_each(list, &dev->users.list)
 668                 count++;
 669
 670         list_for_each(list, &dev->aliases.list)
 671                 count++;
 672
 673         return count;
 674 }
 675
 676 static void
 677 __device_add_user(struct device_user *dep, struct device *dev)
 678 {
 679         struct safe_list *head;
 680
 681         dep->dev = dev;
 682
 683         if (dep->alias)
 684                 head = &dev->aliases;
 685         else
 686                 head = &dev->users;
 687
 688         safe_list_add(&dep->list, head);
 689         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 690
 691         if (dep->cb && dev->present) {
 692                 dep->cb(dep, DEV_EVENT_ADD);
 693                 if (dev->active)
 694                         dep->cb(dep, DEV_EVENT_UP);
 695
 696                 if (dev->link_active)
 697                         dep->cb(dep, DEV_EVENT_LINK_UP);
 698         }
 699 }
 700
 701 void device_add_user(struct device_user *dep, struct device *dev)
 702 {
 703         if (dep->dev == dev)
 704                 return;
 705
 706         if (dep->dev)
 707                 device_remove_user(dep);
 708
 709         if (!dev)
 710                 return;
 711
 712         __device_add_user(dep, dev);
 713 }
 714
 715 void
 716 device_free(struct device *dev)
 717 {
 718         __devlock++;
 719         free(dev->config);
 720         device_cleanup(dev);
 721         dev->type->free(dev);
 722         __devlock--;
 723 }
 724
 725 static void
 726 __device_free_unused(struct device *dev)
 727 {
 728         if (!safe_list_empty(&dev->users) ||
 729                 !safe_list_empty(&dev->aliases) ||
 730             dev->current_config || __devlock)
 731                 return;
 732
 733         device_free(dev);
 734 }
 735
 736 void device_remove_user(struct device_user *dep)
 737 {
 738         struct device *dev = dep->dev;
 739
 740         if (!dep->dev)
 741                 return;
 742
 743         dep->hotplug = false;
 744         if (dep->claimed)
 745                 device_release(dep);
 746
 747         safe_list_del(&dep->list);
 748         dep->dev = NULL;
 749         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 750         __device_free_unused(dev);
 751 }
 752
 753 void
 754 device_free_unused(struct device *dev)
 755 {
 756         struct device *tmp;
 757
 758         if (dev)
 759                 return __device_free_unused(dev);
 760
 761         avl_for_each_element_safe(&devices, dev, avl, tmp)
 762                 __device_free_unused(dev);
 763 }
 764
 765 void
 766 device_init_pending(void)
 767 {
 768         struct device *dev, *tmp;
 769
 770         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 771                 if (!dev->config_pending)
 772                         continue;
 773
 774                 dev->type->config_init(dev);
 775                 dev->config_pending = false;
 776         }
 777 }
 778
 779 static enum dev_change_type
 780 device_set_config(struct device *dev, struct device_type *type,
 781                   struct blob_attr *attr)
 782 {
 783         struct blob_attr *tb[__DEV_ATTR_MAX];
 784         const struct uci_blob_param_list *cfg = type->config_params;
 785
 786         if (type != dev->type)
 787                 return DEV_CONFIG_RECREATE;
 788
 789         if (dev->type->reload)
 790                 return dev->type->reload(dev, attr);
 791
 792         if (uci_blob_check_equal(dev->config, attr, cfg))
 793                 return DEV_CONFIG_NO_CHANGE;
 794
 795         if (cfg == &device_attr_list) {
 796                 memset(tb, 0, sizeof(tb));
 797
 798                 if (attr)
 799                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 800                                 blob_data(attr), blob_len(attr));
 801
 802                 device_init_settings(dev, tb);
 803                 return DEV_CONFIG_RESTART;
 804         } else
 805                 return DEV_CONFIG_RECREATE;
 806 }
 807
 808 enum dev_change_type
 809 device_apply_config(struct device *dev, struct device_type *type,
 810                     struct blob_attr *config)
 811 {
 812         enum dev_change_type change;
 813
 814         change = device_set_config(dev, type, config);
 815         if (dev->external) {
 816                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 817                 change = DEV_CONFIG_APPLIED;
 818         }
 819
 820         switch (change) {
 821                 case DEV_CONFIG_RESTART:
 822                 case DEV_CONFIG_APPLIED:
 823                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 824                         config = blob_memdup(config);
 825                         free(dev->config);
 826                         dev->config = config;
 827                         if (change == DEV_CONFIG_RESTART && dev->present) {
 828                                 int ret = 0;
 829
 830                                 device_set_present(dev, false);
 831                                 if (dev->active && !dev->external) {
 832                                         ret = dev->set_state(dev, false);
 833                                         if (!ret)
 834                                                 ret = dev->set_state(dev, true);
 835                                 }
 836                                 if (!ret)
 837                                         device_set_present(dev, true);
 838                         }
 839                         break;
 840                 case DEV_CONFIG_NO_CHANGE:
 841                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 842                         break;
 843                 case DEV_CONFIG_RECREATE:
 844                         break;
 845         }
 846
 847         return change;
 848 }
 849
 850 static void
 851 device_replace(struct device *dev, struct device *odev)
 852 {
 853         struct device_user *dep, *tmp;
 854
 855         __devlock++;
 856         if (odev->present)
 857                 device_set_present(odev, false);
 858
 859         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 860                 device_release(dep);
 861                 safe_list_del(&dep->list);
 862                 __device_add_user(dep, dev);
 863         }
 864         __devlock--;
 865
 866         device_free(odev);
 867 }
 868
 869 void
 870 device_reset_config(void)
 871 {
 872         struct device *dev;
 873
 874         avl_for_each_element(&devices, dev, avl)
 875                 dev->current_config = false;
 876 }
 877
 878 void
 879 device_reset_old(void)
 880 {
 881         struct device *dev, *tmp, *ndev;
 882
 883         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 884                 if (dev->current_config || dev->default_config)
 885                         continue;
 886
 887                 if (dev->type != &simple_device_type)
 888                         continue;
 889
 890                 ndev = device_create_default(dev->ifname, dev->external);
 891                 if (!ndev)
 892                         continue;
 893
 894                 device_replace(ndev, dev);
 895         }
 896 }
 897
 898 void
 899 device_set_default_ps(bool state)
 900 {
 901         struct device *dev;
 902
 903         if (state == default_ps)
 904                 return;
 905
 906         default_ps = state;
 907
 908         avl_for_each_element(&devices, dev, avl) {
 909                 struct device_settings *s = &dev->settings;
 910                 unsigned int apply_mask = 0;
 911
 912                 if (!(s->flags & DEV_OPT_RPS)) {
 913                         s->rps = default_ps;
 914                         apply_mask |= DEV_OPT_RPS;
 915                 }
 916
 917                 if (!(s->flags & DEV_OPT_XPS)) {
 918                         s->xps = default_ps;
 919                         apply_mask |= DEV_OPT_XPS;
 920                 }
 921
 922                 if (!apply_mask)
 923                         continue;
 924
 925                 if (!(dev->external || (dev->present && dev->active)) ||
 926                                 dev->config_pending)
 927                         continue;
 928
 929                 system_if_apply_settings(dev, s, apply_mask);
 930         }
 931 }
 932
 933 struct device *
 934 device_create(const char *name, struct device_type *type,
 935               struct blob_attr *config)
 936 {
 937         struct device *odev = NULL, *dev;
 938         enum dev_change_type change;
 939
 940         odev = device_get(name, false);
 941         if (odev) {
 942                 odev->current_config = true;
 943                 change = device_apply_config(odev, type, config);
 944                 switch (change) {
 945                 case DEV_CONFIG_RECREATE:
 946                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 947                         device_delete(odev);
 948                         break;
 949                 default:
 950                         return odev;
 951                 }
 952         } else
 953                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 954
 955         config = blob_memdup(config);
 956         if (!config)
 957                 return NULL;
 958
 959         dev = type->create(name, type, config);
 960         if (!dev)
 961                 return NULL;
 962
 963         dev->current_config = true;
 964         dev->config = config;
 965         if (odev)
 966                 device_replace(dev, odev);
 967
 968         if (!config_init && dev->config_pending) {
 969                 type->config_init(dev);
 970                 dev->config_pending = false;
 971         }
 972
 973         return dev;
 974 }
 975
 976 void
 977 device_dump_status(struct blob_buf *b, struct device *dev)
 978 {
 979         struct device_settings st;
 980         void *c, *s;
 981
 982         if (!dev) {
 983                 avl_for_each_element(&devices, dev, avl) {
 984                         if (!dev->present)
 985                                 continue;
 986                         c = blobmsg_open_table(b, dev->ifname);
 987                         device_dump_status(b, dev);
 988                         blobmsg_close_table(b, c);
 989                 }
 990
 991                 return;
 992         }
 993
 994         blobmsg_add_u8(b, "external", dev->external);
 995         blobmsg_add_u8(b, "present", dev->present);
 996         blobmsg_add_string(b, "type", dev->type->name);
 997
 998         if (!dev->present)
 999                 return;
1000
1001         blobmsg_add_u8(b, "up", !!dev->active);
1002         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1003
1004         if (dev->type->dump_info)
1005                 dev->type->dump_info(dev, b);
1006         else
1007                 system_if_dump_info(dev, b);
1008
1009         if (dev->active) {
1010                 device_merge_settings(dev, &st);
1011                 if (st.flags & DEV_OPT_MTU)
1012                         blobmsg_add_u32(b, "mtu", st.mtu);
1013                 if (st.flags & DEV_OPT_MTU6)
1014                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1015                 if (st.flags & DEV_OPT_MACADDR)
1016                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1017                 if (st.flags & DEV_OPT_TXQUEUELEN)
1018                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1019                 if (st.flags & DEV_OPT_IPV6)
1020                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1021                 if (st.flags & DEV_OPT_PROMISC)
1022                         blobmsg_add_u8(b, "promisc", st.promisc);
1023                 if (st.flags & DEV_OPT_RPFILTER)
1024                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1025                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1026                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1027                 if (st.flags & DEV_OPT_IGMPVERSION)
1028                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1029                 if (st.flags & DEV_OPT_MLDVERSION)
1030                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1031                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1032                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1033                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1034                 }
1035                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1036                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1037                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1038                 }
1039                 if (st.flags & DEV_OPT_DADTRANSMITS)
1040                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1041                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1042                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1043                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1044                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1045                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1046                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1047                 if (st.flags & DEV_OPT_MULTICAST)
1048                         blobmsg_add_u8(b, "multicast", st.multicast);
1049                 if (st.flags & DEV_OPT_LEARNING)
1050                         blobmsg_add_u8(b, "learning", st.learning);
1051                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1052                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1053         }
1054
1055         s = blobmsg_open_table(b, "statistics");
1056         if (dev->type->dump_stats)
1057                 dev->type->dump_stats(dev, b);
1058         else
1059                 system_if_dump_stats(dev, b);
1060         blobmsg_close_table(b, s);
1061 }
1062
1063 static void __init simple_device_type_init(void)
1064 {
1065         device_type_add(&simple_device_type);
1066 }