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
  22 #include <libubox/list.h>
  23
  24 #include "netifd.h"
  25 #include "system.h"
  26 #include "config.h"
  27
  28 static struct list_head devtypes = LIST_HEAD_INIT(devtypes);
  29 static struct avl_tree devices;
  30
  31 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  32         [DEV_ATTR_TYPE] = { .name = "type", .type = BLOBMSG_TYPE_STRING },
  33         [DEV_ATTR_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  34         [DEV_ATTR_MTU6] = { .name = "mtu6", .type = BLOBMSG_TYPE_INT32 },
  35         [DEV_ATTR_MACADDR] = { .name = "macaddr", .type = BLOBMSG_TYPE_STRING },
  36         [DEV_ATTR_TXQUEUELEN] = { .name = "txqueuelen", .type = BLOBMSG_TYPE_INT32 },
  37         [DEV_ATTR_ENABLED] = { .name = "enabled", .type = BLOBMSG_TYPE_BOOL },
  38         [DEV_ATTR_IPV6] = { .name = "ipv6", .type = BLOBMSG_TYPE_BOOL },
  39         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  40         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  41         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  42         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  43         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  44         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  45         [DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  46         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  47         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  48         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  49         [DEV_ATTR_MULTICAST_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
  50         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  51         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  52         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  53         [DEV_ATTR_SENDREDIRECTS] = { .name = "sendredirects", .type = BLOBMSG_TYPE_BOOL },
  54         [DEV_ATTR_NEIGHLOCKTIME] = { .name = "neighlocktime", .type = BLOBMSG_TYPE_INT32 },
  55         [DEV_ATTR_ISOLATE] = { .name = "isolate", .type = BLOBMSG_TYPE_BOOL },
  56 };
  57
  58 const struct uci_blob_param_list device_attr_list = {
  59         .n_params = __DEV_ATTR_MAX,
  60         .params = dev_attrs,
  61 };
  62
  63 static int __devlock = 0;
  64
  65 int device_type_add(struct device_type *devtype)
  66 {
  67         if (device_type_get(devtype->name)) {
  68                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  69                                    devtype->name);
  70                 return 1;
  71         }
  72
  73         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  74                 devtype->name);
  75
  76         list_add(&devtype->list, &devtypes);
  77         return 0;
  78 }
  79
  80 /* Retrieve the device type for the given name. If 'bridge' is true, the type
  81  * must have bridge capabilities
  82  */
  83 struct device_type *
  84 device_type_get(const char *tname)
  85 {
  86         struct device_type *cur;
  87
  88         list_for_each_entry(cur, &devtypes, list)
  89                 if (!strcmp(cur->name, tname))
  90                         return cur;
  91
  92         return NULL;
  93 }
  94
  95 void device_lock(void)
  96 {
  97         __devlock++;
  98 }
  99
 100 void device_unlock(void)
 101 {
 102         __devlock--;
 103         if (!__devlock)
 104                 device_free_unused(NULL);
 105 }
 106
 107 static int device_vlan_len(struct kvlist *kv, const void *data)
 108 {
 109         return sizeof(unsigned int);
 110 }
 111
 112 void device_vlan_update(bool done)
 113 {
 114         struct device *dev;
 115
 116         avl_for_each_element(&devices, dev, avl) {
 117                 if (!dev->vlans.update)
 118                         continue;
 119
 120                 if (!done) {
 121                         if (dev->vlan_aliases.get_len)
 122                                 kvlist_free(&dev->vlan_aliases);
 123                         else
 124                                 kvlist_init(&dev->vlan_aliases, device_vlan_len);
 125                         vlist_update(&dev->vlans);
 126                 } else {
 127                         vlist_flush(&dev->vlans);
 128                 }
 129         }
 130 }
 131
 132 static int set_device_state(struct device *dev, bool state)
 133 {
 134         if (state) {
 135                 /* Get ifindex for all devices being enabled so a valid  */
 136                 /* ifindex is in place avoiding possible race conditions */
 137                 device_set_ifindex(dev, system_if_resolve(dev));
 138                 if (!dev->ifindex)
 139                         return -1;
 140
 141                 system_if_get_settings(dev, &dev->orig_settings);
 142                 /* Only keep orig settings based on what needs to be set */
 143                 dev->orig_settings.valid_flags = dev->orig_settings.flags;
 144                 dev->orig_settings.flags &= dev->settings.flags;
 145                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 146
 147                 system_if_up(dev);
 148         } else {
 149                 system_if_down(dev);
 150                 system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
 151         }
 152
 153         return 0;
 154 }
 155
 156 static int
 157 simple_device_set_state(struct device *dev, bool state)
 158 {
 159         struct device *pdev;
 160         int ret = 0;
 161
 162         pdev = dev->parent.dev;
 163         if (state && !pdev) {
 164                 pdev = system_if_get_parent(dev);
 165                 if (pdev)
 166                         device_add_user(&dev->parent, pdev);
 167         }
 168
 169         if (pdev) {
 170                 if (state)
 171                         ret = device_claim(&dev->parent);
 172                 else
 173                         device_release(&dev->parent);
 174
 175                 if (ret < 0)
 176                         return ret;
 177         }
 178         return set_device_state(dev, state);
 179 }
 180
 181 static struct device *
 182 simple_device_create(const char *name, struct device_type *devtype,
 183                      struct blob_attr *attr)
 184 {
 185         struct blob_attr *tb[__DEV_ATTR_MAX];
 186         struct device *dev = NULL;
 187
 188         /* device type is unused for simple devices */
 189         devtype = NULL;
 190
 191         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 192         dev = device_get(name, true);
 193         if (!dev)
 194                 return NULL;
 195
 196         dev->set_state = simple_device_set_state;
 197         device_init_settings(dev, tb);
 198
 199         return dev;
 200 }
 201
 202 static void simple_device_free(struct device *dev)
 203 {
 204         if (dev->parent.dev)
 205                 device_remove_user(&dev->parent);
 206         free(dev);
 207 }
 208
 209 struct device_type simple_device_type = {
 210         .name = "Network device",
 211         .config_params = &device_attr_list,
 212
 213         .create = simple_device_create,
 214         .check_state = system_if_check,
 215         .free = simple_device_free,
 216 };
 217
 218 void
 219 device_merge_settings(struct device *dev, struct device_settings *n)
 220 {
 221         struct device_settings *os = &dev->orig_settings;
 222         struct device_settings *s = &dev->settings;
 223
 224         memset(n, 0, sizeof(*n));
 225         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 226         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 227         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 228                 s->txqueuelen : os->txqueuelen;
 229         memcpy(n->macaddr,
 230                 (s->flags & (DEV_OPT_MACADDR|DEV_OPT_DEFAULT_MACADDR) ? s->macaddr : os->macaddr),
 231                 sizeof(n->macaddr));
 232         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 233         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 234         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 235         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 236         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 237         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 238         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 239                 s->neigh4reachabletime : os->neigh4reachabletime;
 240         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 241                 s->neigh6reachabletime : os->neigh6reachabletime;
 242         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 243                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 244         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 245                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 246         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 247                 s->neigh4locktime : os->neigh4locktime;
 248         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 249                 s->dadtransmits : os->dadtransmits;
 250         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 251                 s->multicast : os->multicast;
 252         n->multicast_to_unicast = s->multicast_to_unicast;
 253         n->multicast_router = s->multicast_router;
 254         n->multicast_fast_leave = s->multicast_fast_leave;
 255         n->learning = s->learning;
 256         n->unicast_flood = s->unicast_flood;
 257         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 258                 s->sendredirects : os->sendredirects;
 259         n->flags = s->flags | os->flags | os->valid_flags;
 260 }
 261
 262 void
 263 device_init_settings(struct device *dev, struct blob_attr **tb)
 264 {
 265         struct device_settings *s = &dev->settings;
 266         struct blob_attr *cur;
 267         struct ether_addr *ea;
 268         bool disabled = false;
 269
 270         s->flags = 0;
 271         if ((cur = tb[DEV_ATTR_ENABLED]))
 272                 disabled = !blobmsg_get_bool(cur);
 273
 274         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 275                 s->mtu = blobmsg_get_u32(cur);
 276                 s->flags |= DEV_OPT_MTU;
 277         }
 278
 279         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 280                 s->mtu6 = blobmsg_get_u32(cur);
 281                 s->flags |= DEV_OPT_MTU6;
 282         }
 283
 284         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 285                 s->txqueuelen = blobmsg_get_u32(cur);
 286                 s->flags |= DEV_OPT_TXQUEUELEN;
 287         }
 288
 289         if ((cur = tb[DEV_ATTR_MACADDR])) {
 290                 ea = ether_aton(blobmsg_data(cur));
 291                 if (ea) {
 292                         memcpy(s->macaddr, ea, 6);
 293                         s->flags |= DEV_OPT_MACADDR;
 294                 }
 295         }
 296
 297         if ((cur = tb[DEV_ATTR_IPV6])) {
 298                 s->ipv6 = blobmsg_get_bool(cur);
 299                 s->flags |= DEV_OPT_IPV6;
 300         }
 301
 302         if ((cur = tb[DEV_ATTR_PROMISC])) {
 303                 s->promisc = blobmsg_get_bool(cur);
 304                 s->flags |= DEV_OPT_PROMISC;
 305         }
 306
 307         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 308                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 309                         s->flags |= DEV_OPT_RPFILTER;
 310                 else
 311                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 312         }
 313
 314         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 315                 s->acceptlocal = blobmsg_get_bool(cur);
 316                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 317         }
 318
 319         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 320                 s->igmpversion = blobmsg_get_u32(cur);
 321                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 322                         s->flags |= DEV_OPT_IGMPVERSION;
 323                 else
 324                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 325         }
 326
 327         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 328                 s->mldversion = blobmsg_get_u32(cur);
 329                 if (s->mldversion >= 1 && s->mldversion <= 2)
 330                         s->flags |= DEV_OPT_MLDVERSION;
 331                 else
 332                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 333         }
 334
 335         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 336                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 337                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 338         }
 339
 340         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 341                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 342                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 343         }
 344
 345         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 346                 s->neigh4locktime = blobmsg_get_u32(cur);
 347                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 348         }
 349
 350         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 351                 s->dadtransmits = blobmsg_get_u32(cur);
 352                 s->flags |= DEV_OPT_DADTRANSMITS;
 353         }
 354
 355         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 356                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 357                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 358         }
 359
 360         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 361                 s->multicast_router = blobmsg_get_u32(cur);
 362                 if (s->multicast_router <= 2)
 363                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 364                 else
 365                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 366         }
 367
 368         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 369                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 370                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 371         }
 372
 373         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 374                 s->multicast = blobmsg_get_bool(cur);
 375                 s->flags |= DEV_OPT_MULTICAST;
 376         }
 377
 378         if ((cur = tb[DEV_ATTR_LEARNING])) {
 379                 s->learning = blobmsg_get_bool(cur);
 380                 s->flags |= DEV_OPT_LEARNING;
 381         }
 382
 383         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 384                 s->unicast_flood = blobmsg_get_bool(cur);
 385                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 386         }
 387
 388         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 389                 s->sendredirects = blobmsg_get_bool(cur);
 390                 s->flags |= DEV_OPT_SENDREDIRECTS;
 391         }
 392
 393         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 394                 s->isolate = blobmsg_get_bool(cur);
 395                 s->flags |= DEV_OPT_ISOLATE;
 396         }
 397
 398         device_set_disabled(dev, disabled);
 399 }
 400
 401 static void __init dev_init(void)
 402 {
 403         avl_init(&devices, avl_strcmp, true, NULL);
 404 }
 405
 406 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 407 {
 408         struct device_user *dep = container_of(list, struct device_user, list);
 409         int *ev = ctx;
 410
 411         /* device might have been removed by an earlier callback */
 412         if (!dep->dev)
 413                 return 0;
 414
 415         if (dep->cb)
 416                 dep->cb(dep, *ev);
 417         return 0;
 418 }
 419
 420 void device_broadcast_event(struct device *dev, enum device_event ev)
 421 {
 422         int dev_ev = ev;
 423
 424         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 425         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 426 }
 427
 428 static void
 429 device_fill_default_settings(struct device *dev)
 430 {
 431         struct device_settings *s = &dev->settings;
 432         struct ether_addr *ea;
 433
 434         if (!(s->flags & DEV_OPT_MACADDR)) {
 435                 ea = config_get_default_macaddr(dev->ifname);
 436                 if (ea) {
 437                         memcpy(s->macaddr, ea, 6);
 438                         s->flags |= DEV_OPT_DEFAULT_MACADDR;
 439                 }
 440         }
 441 }
 442
 443 int device_claim(struct device_user *dep)
 444 {
 445         struct device *dev = dep->dev;
 446         int ret = 0;
 447
 448         if (dep->claimed)
 449                 return 0;
 450
 451         if (!dev)
 452                 return -1;
 453
 454         dep->claimed = true;
 455         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 456         if (++dev->active != 1)
 457                 return 0;
 458
 459         device_broadcast_event(dev, DEV_EVENT_SETUP);
 460         device_fill_default_settings(dev);
 461         if (dev->external) {
 462                 /* Get ifindex for external claimed devices so a valid   */
 463                 /* ifindex is in place avoiding possible race conditions */
 464                 device_set_ifindex(dev, system_if_resolve(dev));
 465                 if (!dev->ifindex)
 466                         ret = -1;
 467
 468                 system_if_get_settings(dev, &dev->orig_settings);
 469         } else
 470                 ret = dev->set_state(dev, true);
 471
 472         if (ret == 0)
 473                 device_broadcast_event(dev, DEV_EVENT_UP);
 474         else {
 475                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 476                 dev->active = 0;
 477                 dep->claimed = false;
 478         }
 479
 480         return ret;
 481 }
 482
 483 void device_release(struct device_user *dep)
 484 {
 485         struct device *dev = dep->dev;
 486
 487         if (!dep->claimed)
 488                 return;
 489
 490         dep->claimed = false;
 491         dev->active--;
 492         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 493         assert(dev->active >= 0);
 494
 495         if (dev->active)
 496                 return;
 497
 498         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 499         if (!dev->external)
 500                 dev->set_state(dev, false);
 501
 502         if (dev->active)
 503                 return;
 504
 505         device_broadcast_event(dev, DEV_EVENT_DOWN);
 506 }
 507
 508 int device_check_state(struct device *dev)
 509 {
 510         if (!dev->type->check_state)
 511                 return simple_device_type.check_state(dev);
 512
 513         return dev->type->check_state(dev);
 514 }
 515
 516 int device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 517 {
 518         assert(dev);
 519         assert(type);
 520
 521         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 522         INIT_SAFE_LIST(&dev->users);
 523         INIT_SAFE_LIST(&dev->aliases);
 524         dev->type = type;
 525
 526         if (name) {
 527                 int ret;
 528
 529                 ret = device_set_ifname(dev, name);
 530                 if (ret < 0)
 531                         return ret;
 532         }
 533
 534         if (!dev->set_state)
 535                 dev->set_state = set_device_state;
 536
 537         return 0;
 538 }
 539
 540 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 541 {
 542         int ret;
 543
 544         ret = device_init_virtual(dev, type, ifname);
 545         if (ret < 0)
 546                 return ret;
 547
 548         dev->avl.key = dev->ifname;
 549
 550         ret = avl_insert(&devices, &dev->avl);
 551         if (ret < 0)
 552                 return ret;
 553
 554         system_if_clear_state(dev);
 555
 556         return 0;
 557 }
 558
 559 static struct device *
 560 device_create_default(const char *name, bool external)
 561 {
 562         struct device *dev;
 563
 564         if (!external && system_if_force_external(name))
 565                 return NULL;
 566
 567         D(DEVICE, "Create simple device '%s'\n", name);
 568         dev = calloc(1, sizeof(*dev));
 569         if (!dev)
 570                 return NULL;
 571
 572         dev->external = external;
 573         dev->set_state = simple_device_set_state;
 574
 575         if (device_init(dev, &simple_device_type, name) < 0) {
 576                 device_cleanup(dev);
 577                 free(dev);
 578                 return NULL;
 579         }
 580
 581         dev->default_config = true;
 582         if (external)
 583                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 584
 585         device_check_state(dev);
 586
 587         return dev;
 588 }
 589
 590 struct device *
 591 device_find(const char *name)
 592 {
 593         struct device *dev;
 594
 595         return avl_find_element(&devices, name, dev, avl);
 596 }
 597
 598 struct device *
 599 device_get(const char *name, int create)
 600 {
 601         struct device *dev;
 602
 603         dev = avl_find_element(&devices, name, dev, avl);
 604
 605         if (!dev && strchr(name, '.'))
 606                 return get_vlan_device_chain(name, create);
 607
 608         if (name[0] == '@')
 609                 return device_alias_get(name + 1);
 610
 611         if (dev) {
 612                 if (create > 1 && !dev->external) {
 613                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 614                         dev->external = true;
 615                         device_set_present(dev, true);
 616                 }
 617                 return dev;
 618         }
 619
 620         if (!create)
 621                 return NULL;
 622
 623         return device_create_default(name, create > 1);
 624 }
 625
 626 static void
 627 device_delete(struct device *dev)
 628 {
 629         if (!dev->avl.key)
 630                 return;
 631
 632         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 633         avl_delete(&devices, &dev->avl);
 634         dev->avl.key = NULL;
 635 }
 636
 637 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 638 {
 639         struct device_user *dep = container_of(list, struct device_user, list);
 640         if (dep->cb)
 641                 dep->cb(dep, DEV_EVENT_REMOVE);
 642
 643         device_release(dep);
 644         return 0;
 645 }
 646
 647 void device_cleanup(struct device *dev)
 648 {
 649         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 650         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 651         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 652         device_delete(dev);
 653 }
 654
 655 static void __device_set_present(struct device *dev, bool state)
 656 {
 657         if (dev->present == state)
 658                 return;
 659
 660         dev->present = state;
 661         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 662 }
 663
 664 void
 665 device_refresh_present(struct device *dev)
 666 {
 667         bool state = dev->sys_present;
 668
 669         if (dev->disabled || dev->deferred)
 670                 state = false;
 671
 672         __device_set_present(dev, state);
 673 }
 674
 675 void device_set_present(struct device *dev, bool state)
 676 {
 677         if (dev->sys_present == state)
 678                 return;
 679
 680         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 681         dev->sys_present = state;
 682         device_refresh_present(dev);
 683 }
 684
 685 void device_set_link(struct device *dev, bool state)
 686 {
 687         if (dev->link_active == state)
 688                 return;
 689
 690         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 691
 692         dev->link_active = state;
 693         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 694 }
 695
 696 void device_set_ifindex(struct device *dev, int ifindex)
 697 {
 698         if (dev->ifindex == ifindex)
 699                 return;
 700
 701         dev->ifindex = ifindex;
 702         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 703 }
 704
 705 int device_set_ifname(struct device *dev, const char *name)
 706 {
 707         int ret = 0;
 708
 709         if (!strcmp(dev->ifname, name))
 710                 return 0;
 711
 712         if (strlen(name) > sizeof(dev->ifname) - 1)
 713                 return -1;
 714
 715         if (dev->avl.key)
 716                 avl_delete(&devices, &dev->avl);
 717
 718         strcpy(dev->ifname, name);
 719
 720         if (dev->avl.key)
 721                 ret = avl_insert(&devices, &dev->avl);
 722
 723         if (ret == 0)
 724                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 725
 726         return ret;
 727 }
 728
 729 static int device_refcount(struct device *dev)
 730 {
 731         struct list_head *list;
 732         int count = 0;
 733
 734         list_for_each(list, &dev->users.list)
 735                 count++;
 736
 737         list_for_each(list, &dev->aliases.list)
 738                 count++;
 739
 740         return count;
 741 }
 742
 743 static void
 744 __device_add_user(struct device_user *dep, struct device *dev)
 745 {
 746         struct safe_list *head;
 747
 748         dep->dev = dev;
 749
 750         if (dep->alias)
 751                 head = &dev->aliases;
 752         else
 753                 head = &dev->users;
 754
 755         safe_list_add(&dep->list, head);
 756         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 757
 758         if (dep->cb && dev->present) {
 759                 dep->cb(dep, DEV_EVENT_ADD);
 760                 if (dev->active)
 761                         dep->cb(dep, DEV_EVENT_UP);
 762
 763                 if (dev->link_active)
 764                         dep->cb(dep, DEV_EVENT_LINK_UP);
 765         }
 766 }
 767
 768 void device_add_user(struct device_user *dep, struct device *dev)
 769 {
 770         if (dep->dev == dev)
 771                 return;
 772
 773         if (dep->dev)
 774                 device_remove_user(dep);
 775
 776         if (!dev)
 777                 return;
 778
 779         __device_add_user(dep, dev);
 780 }
 781
 782 static void
 783 device_free(struct device *dev)
 784 {
 785         __devlock++;
 786         free(dev->config);
 787         device_cleanup(dev);
 788         dev->type->free(dev);
 789         __devlock--;
 790 }
 791
 792 static void
 793 __device_free_unused(struct device *dev)
 794 {
 795         if (!safe_list_empty(&dev->users) ||
 796                 !safe_list_empty(&dev->aliases) ||
 797             dev->current_config || __devlock)
 798                 return;
 799
 800         device_free(dev);
 801 }
 802
 803 void device_remove_user(struct device_user *dep)
 804 {
 805         struct device *dev = dep->dev;
 806
 807         if (!dep->dev)
 808                 return;
 809
 810         dep->hotplug = false;
 811         if (dep->claimed)
 812                 device_release(dep);
 813
 814         safe_list_del(&dep->list);
 815         dep->dev = NULL;
 816         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 817         __device_free_unused(dev);
 818 }
 819
 820 void
 821 device_free_unused(struct device *dev)
 822 {
 823         struct device *tmp;
 824
 825         if (dev)
 826                 return __device_free_unused(dev);
 827
 828         avl_for_each_element_safe(&devices, dev, avl, tmp)
 829                 __device_free_unused(dev);
 830 }
 831
 832 void
 833 device_init_pending(void)
 834 {
 835         struct device *dev, *tmp;
 836
 837         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 838                 if (!dev->config_pending)
 839                         continue;
 840
 841                 dev->type->config_init(dev);
 842                 dev->config_pending = false;
 843                 device_check_state(dev);
 844         }
 845 }
 846
 847 static enum dev_change_type
 848 device_set_config(struct device *dev, struct device_type *type,
 849                   struct blob_attr *attr)
 850 {
 851         struct blob_attr *tb[__DEV_ATTR_MAX];
 852         const struct uci_blob_param_list *cfg = type->config_params;
 853
 854         if (type != dev->type)
 855                 return DEV_CONFIG_RECREATE;
 856
 857         if (dev->type->reload)
 858                 return dev->type->reload(dev, attr);
 859
 860         if (uci_blob_check_equal(dev->config, attr, cfg))
 861                 return DEV_CONFIG_NO_CHANGE;
 862
 863         if (cfg == &device_attr_list) {
 864                 memset(tb, 0, sizeof(tb));
 865
 866                 if (attr)
 867                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 868                                 blob_data(attr), blob_len(attr));
 869
 870                 device_init_settings(dev, tb);
 871                 return DEV_CONFIG_RESTART;
 872         } else
 873                 return DEV_CONFIG_RECREATE;
 874 }
 875
 876 enum dev_change_type
 877 device_apply_config(struct device *dev, struct device_type *type,
 878                     struct blob_attr *config)
 879 {
 880         enum dev_change_type change;
 881
 882         change = device_set_config(dev, type, config);
 883         if (dev->external) {
 884                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 885                 change = DEV_CONFIG_APPLIED;
 886         }
 887
 888         switch (change) {
 889                 case DEV_CONFIG_RESTART:
 890                 case DEV_CONFIG_APPLIED:
 891                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 892                         config = blob_memdup(config);
 893                         free(dev->config);
 894                         dev->config = config;
 895                         if (change == DEV_CONFIG_RESTART && dev->present) {
 896                                 int ret = 0;
 897
 898                                 device_set_present(dev, false);
 899                                 if (dev->active && !dev->external) {
 900                                         ret = dev->set_state(dev, false);
 901                                         if (!ret)
 902                                                 ret = dev->set_state(dev, true);
 903                                 }
 904                                 if (!ret)
 905                                         device_set_present(dev, true);
 906                         }
 907                         break;
 908                 case DEV_CONFIG_NO_CHANGE:
 909                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 910                         break;
 911                 case DEV_CONFIG_RECREATE:
 912                         break;
 913         }
 914
 915         return change;
 916 }
 917
 918 static void
 919 device_replace(struct device *dev, struct device *odev)
 920 {
 921         struct device_user *dep, *tmp;
 922
 923         __devlock++;
 924         if (odev->present)
 925                 device_set_present(odev, false);
 926
 927         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 928                 device_release(dep);
 929                 safe_list_del(&dep->list);
 930                 __device_add_user(dep, dev);
 931         }
 932         __devlock--;
 933
 934         device_free(odev);
 935 }
 936
 937 void
 938 device_reset_config(void)
 939 {
 940         struct device *dev;
 941
 942         avl_for_each_element(&devices, dev, avl)
 943                 dev->current_config = false;
 944 }
 945
 946 void
 947 device_reset_old(void)
 948 {
 949         struct device *dev, *tmp, *ndev;
 950
 951         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 952                 if (dev->current_config || dev->default_config)
 953                         continue;
 954
 955                 if (dev->type != &simple_device_type)
 956                         continue;
 957
 958                 ndev = device_create_default(dev->ifname, dev->external);
 959                 if (!ndev)
 960                         continue;
 961
 962                 device_replace(ndev, dev);
 963         }
 964 }
 965
 966 struct device *
 967 device_create(const char *name, struct device_type *type,
 968               struct blob_attr *config)
 969 {
 970         struct device *odev = NULL, *dev;
 971         enum dev_change_type change;
 972
 973         odev = device_find(name);
 974         if (odev) {
 975                 odev->current_config = true;
 976                 change = device_apply_config(odev, type, config);
 977                 switch (change) {
 978                 case DEV_CONFIG_RECREATE:
 979                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 980                         device_delete(odev);
 981                         break;
 982                 default:
 983                         return odev;
 984                 }
 985         } else
 986                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 987
 988         config = blob_memdup(config);
 989         if (!config)
 990                 return NULL;
 991
 992         dev = type->create(name, type, config);
 993         if (!dev)
 994                 return NULL;
 995
 996         dev->current_config = true;
 997         dev->config = config;
 998         if (odev)
 999                 device_replace(dev, odev);
1000
1001         if (!config_init && dev->config_pending) {
1002                 type->config_init(dev);
1003                 dev->config_pending = false;
1004         }
1005
1006         device_check_state(dev);
1007
1008         return dev;
1009 }
1010
1011 void
1012 device_dump_status(struct blob_buf *b, struct device *dev)
1013 {
1014         struct device_settings st;
1015         void *c, *s;
1016
1017         if (!dev) {
1018                 avl_for_each_element(&devices, dev, avl) {
1019                         if (!dev->present)
1020                                 continue;
1021                         c = blobmsg_open_table(b, dev->ifname);
1022                         device_dump_status(b, dev);
1023                         blobmsg_close_table(b, c);
1024                 }
1025
1026                 return;
1027         }
1028
1029         blobmsg_add_u8(b, "external", dev->external);
1030         blobmsg_add_u8(b, "present", dev->present);
1031         blobmsg_add_string(b, "type", dev->type->name);
1032
1033         if (!dev->present)
1034                 return;
1035
1036         blobmsg_add_u8(b, "up", !!dev->active);
1037         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1038
1039         if (dev->type->dump_info)
1040                 dev->type->dump_info(dev, b);
1041         else
1042                 system_if_dump_info(dev, b);
1043
1044         if (dev->active) {
1045                 device_merge_settings(dev, &st);
1046                 if (st.flags & DEV_OPT_MTU)
1047                         blobmsg_add_u32(b, "mtu", st.mtu);
1048                 if (st.flags & DEV_OPT_MTU6)
1049                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1050                 if (st.flags & DEV_OPT_MACADDR)
1051                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1052                 if (st.flags & DEV_OPT_TXQUEUELEN)
1053                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1054                 if (st.flags & DEV_OPT_IPV6)
1055                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1056                 if (st.flags & DEV_OPT_PROMISC)
1057                         blobmsg_add_u8(b, "promisc", st.promisc);
1058                 if (st.flags & DEV_OPT_RPFILTER)
1059                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1060                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1061                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1062                 if (st.flags & DEV_OPT_IGMPVERSION)
1063                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1064                 if (st.flags & DEV_OPT_MLDVERSION)
1065                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1066                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1067                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1068                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1069                 }
1070                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1071                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1072                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1073                 }
1074                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1075                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1076                 if (st.flags & DEV_OPT_DADTRANSMITS)
1077                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1078                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1079                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1080                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1081                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1082                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1083                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1084                 if (st.flags & DEV_OPT_MULTICAST)
1085                         blobmsg_add_u8(b, "multicast", st.multicast);
1086                 if (st.flags & DEV_OPT_LEARNING)
1087                         blobmsg_add_u8(b, "learning", st.learning);
1088                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1089                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1090                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1091                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1092         }
1093
1094         s = blobmsg_open_table(b, "statistics");
1095         if (dev->type->dump_stats)
1096                 dev->type->dump_stats(dev, b);
1097         else
1098                 system_if_dump_stats(dev, b);
1099         blobmsg_close_table(b, s);
1100 }
1101
1102 static void __init simple_device_type_init(void)
1103 {
1104         device_type_add(&simple_device_type);
1105 }