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_IP6SEGMENTROUTING] = { .name = "ip6segmentrouting", .type = BLOBMSG_TYPE_BOOL },
  40         [DEV_ATTR_PROMISC] = { .name = "promisc", .type = BLOBMSG_TYPE_BOOL },
  41         [DEV_ATTR_RPFILTER] = { .name = "rpfilter", .type = BLOBMSG_TYPE_STRING },
  42         [DEV_ATTR_ACCEPTLOCAL] = { .name = "acceptlocal", .type = BLOBMSG_TYPE_BOOL },
  43         [DEV_ATTR_IGMPVERSION] = { .name = "igmpversion", .type = BLOBMSG_TYPE_INT32 },
  44         [DEV_ATTR_MLDVERSION] = { .name = "mldversion", .type = BLOBMSG_TYPE_INT32 },
  45         [DEV_ATTR_NEIGHREACHABLETIME] = { .name = "neighreachabletime", .type = BLOBMSG_TYPE_INT32 },
  46         [DEV_ATTR_NEIGHGCSTALETIME] = { .name = "neighgcstaletime", .type = BLOBMSG_TYPE_INT32 },
  47         [DEV_ATTR_DADTRANSMITS] = { .name = "dadtransmits", .type = BLOBMSG_TYPE_INT32 },
  48         [DEV_ATTR_MULTICAST_TO_UNICAST] = { .name = "multicast_to_unicast", .type = BLOBMSG_TYPE_BOOL },
  49         [DEV_ATTR_MULTICAST_ROUTER] = { .name = "multicast_router", .type = BLOBMSG_TYPE_INT32 },
  50         [DEV_ATTR_MULTICAST_FAST_LEAVE] = { .name = "multicast_fast_leave", . type = BLOBMSG_TYPE_BOOL },
  51         [DEV_ATTR_MULTICAST] = { .name ="multicast", .type = BLOBMSG_TYPE_BOOL },
  52         [DEV_ATTR_LEARNING] = { .name ="learning", .type = BLOBMSG_TYPE_BOOL },
  53         [DEV_ATTR_UNICAST_FLOOD] = { .name ="unicast_flood", .type = BLOBMSG_TYPE_BOOL },
  54         [DEV_ATTR_SENDREDIRECTS] = { .name = "sendredirects", .type = BLOBMSG_TYPE_BOOL },
  55         [DEV_ATTR_NEIGHLOCKTIME] = { .name = "neighlocktime", .type = BLOBMSG_TYPE_INT32 },
  56         [DEV_ATTR_ISOLATE] = { .name = "isolate", .type = BLOBMSG_TYPE_BOOL },
  57 };
  58
  59 const struct uci_blob_param_list device_attr_list = {
  60         .n_params = __DEV_ATTR_MAX,
  61         .params = dev_attrs,
  62 };
  63
  64 static int __devlock = 0;
  65
  66 int device_type_add(struct device_type *devtype)
  67 {
  68         if (device_type_get(devtype->name)) {
  69                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  70                                    devtype->name);
  71                 return 1;
  72         }
  73
  74         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  75                 devtype->name);
  76
  77         list_add(&devtype->list, &devtypes);
  78         return 0;
  79 }
  80
  81 /* Retrieve the device type for the given name. If 'bridge' is true, the type
  82  * must have bridge capabilities
  83  */
  84 struct device_type *
  85 device_type_get(const char *tname)
  86 {
  87         struct device_type *cur;
  88
  89         list_for_each_entry(cur, &devtypes, list)
  90                 if (!strcmp(cur->name, tname))
  91                         return cur;
  92
  93         return NULL;
  94 }
  95
  96 void device_lock(void)
  97 {
  98         __devlock++;
  99 }
 100
 101 void device_unlock(void)
 102 {
 103         __devlock--;
 104         if (!__devlock)
 105                 device_free_unused(NULL);
 106 }
 107
 108 static int device_vlan_len(struct kvlist *kv, const void *data)
 109 {
 110         return sizeof(unsigned int);
 111 }
 112
 113 void device_vlan_update(bool done)
 114 {
 115         struct device *dev;
 116
 117         avl_for_each_element(&devices, dev, avl) {
 118                 if (!dev->vlans.update)
 119                         continue;
 120
 121                 if (!done) {
 122                         if (dev->vlan_aliases.get_len)
 123                                 kvlist_free(&dev->vlan_aliases);
 124                         else
 125                                 kvlist_init(&dev->vlan_aliases, device_vlan_len);
 126                         vlist_update(&dev->vlans);
 127                 } else {
 128                         vlist_flush(&dev->vlans);
 129                 }
 130         }
 131 }
 132
 133 static int set_device_state(struct device *dev, bool state)
 134 {
 135         if (state) {
 136                 /* Get ifindex for all devices being enabled so a valid  */
 137                 /* ifindex is in place avoiding possible race conditions */
 138                 device_set_ifindex(dev, system_if_resolve(dev));
 139                 if (!dev->ifindex)
 140                         return -1;
 141
 142                 system_if_get_settings(dev, &dev->orig_settings);
 143                 /* Only keep orig settings based on what needs to be set */
 144                 dev->orig_settings.valid_flags = dev->orig_settings.flags;
 145                 dev->orig_settings.flags &= dev->settings.flags;
 146                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 147
 148                 system_if_up(dev);
 149         } else {
 150                 system_if_down(dev);
 151                 system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
 152         }
 153
 154         return 0;
 155 }
 156
 157 static int
 158 simple_device_set_state(struct device *dev, bool state)
 159 {
 160         struct device *pdev;
 161         int ret = 0;
 162
 163         pdev = dev->parent.dev;
 164         if (state && !pdev) {
 165                 pdev = system_if_get_parent(dev);
 166                 if (pdev)
 167                         device_add_user(&dev->parent, pdev);
 168         }
 169
 170         if (pdev) {
 171                 if (state)
 172                         ret = device_claim(&dev->parent);
 173                 else
 174                         device_release(&dev->parent);
 175
 176                 if (ret < 0)
 177                         return ret;
 178         }
 179         return set_device_state(dev, state);
 180 }
 181
 182 static struct device *
 183 simple_device_create(const char *name, struct device_type *devtype,
 184                      struct blob_attr *attr)
 185 {
 186         struct blob_attr *tb[__DEV_ATTR_MAX];
 187         struct device *dev = NULL;
 188
 189         /* device type is unused for simple devices */
 190         devtype = NULL;
 191
 192         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 193         dev = device_get(name, true);
 194         if (!dev)
 195                 return NULL;
 196
 197         dev->set_state = simple_device_set_state;
 198         device_init_settings(dev, tb);
 199
 200         return dev;
 201 }
 202
 203 static void simple_device_free(struct device *dev)
 204 {
 205         if (dev->parent.dev)
 206                 device_remove_user(&dev->parent);
 207         free(dev);
 208 }
 209
 210 struct device_type simple_device_type = {
 211         .name = "Network device",
 212         .config_params = &device_attr_list,
 213
 214         .create = simple_device_create,
 215         .check_state = system_if_check,
 216         .free = simple_device_free,
 217 };
 218
 219 void
 220 device_merge_settings(struct device *dev, struct device_settings *n)
 221 {
 222         struct device_settings *os = &dev->orig_settings;
 223         struct device_settings *s = &dev->settings;
 224
 225         memset(n, 0, sizeof(*n));
 226         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 227         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 228         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 229                 s->txqueuelen : os->txqueuelen;
 230         memcpy(n->macaddr,
 231                 (s->flags & (DEV_OPT_MACADDR|DEV_OPT_DEFAULT_MACADDR) ? s->macaddr : os->macaddr),
 232                 sizeof(n->macaddr));
 233         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 234         n->ip6segmentrouting = s->flags & DEV_OPT_IP6SEGMENTROUTING ? s->ip6segmentrouting : os->ip6segmentrouting;
 235         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 236         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 237         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 238         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 239         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 240         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 241                 s->neigh4reachabletime : os->neigh4reachabletime;
 242         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 243                 s->neigh6reachabletime : os->neigh6reachabletime;
 244         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 245                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 246         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 247                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 248         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 249                 s->neigh4locktime : os->neigh4locktime;
 250         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 251                 s->dadtransmits : os->dadtransmits;
 252         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 253                 s->multicast : os->multicast;
 254         n->multicast_to_unicast = s->multicast_to_unicast;
 255         n->multicast_router = s->multicast_router;
 256         n->multicast_fast_leave = s->multicast_fast_leave;
 257         n->learning = s->learning;
 258         n->unicast_flood = s->unicast_flood;
 259         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 260                 s->sendredirects : os->sendredirects;
 261         n->flags = s->flags | os->flags | os->valid_flags;
 262 }
 263
 264 void
 265 device_init_settings(struct device *dev, struct blob_attr **tb)
 266 {
 267         struct device_settings *s = &dev->settings;
 268         struct blob_attr *cur;
 269         struct ether_addr *ea;
 270         bool disabled = false;
 271
 272         s->flags = 0;
 273         if ((cur = tb[DEV_ATTR_ENABLED]))
 274                 disabled = !blobmsg_get_bool(cur);
 275
 276         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 277                 s->mtu = blobmsg_get_u32(cur);
 278                 s->flags |= DEV_OPT_MTU;
 279         }
 280
 281         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 282                 s->mtu6 = blobmsg_get_u32(cur);
 283                 s->flags |= DEV_OPT_MTU6;
 284         }
 285
 286         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 287                 s->txqueuelen = blobmsg_get_u32(cur);
 288                 s->flags |= DEV_OPT_TXQUEUELEN;
 289         }
 290
 291         if ((cur = tb[DEV_ATTR_MACADDR])) {
 292                 ea = ether_aton(blobmsg_data(cur));
 293                 if (ea) {
 294                         memcpy(s->macaddr, ea, 6);
 295                         s->flags |= DEV_OPT_MACADDR;
 296                 }
 297         }
 298
 299         if ((cur = tb[DEV_ATTR_IPV6])) {
 300                 s->ipv6 = blobmsg_get_bool(cur);
 301                 s->flags |= DEV_OPT_IPV6;
 302         }
 303
 304         if ((cur = tb[DEV_ATTR_IP6SEGMENTROUTING])) {
 305                 s->ip6segmentrouting = blobmsg_get_bool(cur);
 306                 s->flags |= DEV_OPT_IP6SEGMENTROUTING;
 307         }
 308
 309         if ((cur = tb[DEV_ATTR_PROMISC])) {
 310                 s->promisc = blobmsg_get_bool(cur);
 311                 s->flags |= DEV_OPT_PROMISC;
 312         }
 313
 314         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 315                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 316                         s->flags |= DEV_OPT_RPFILTER;
 317                 else
 318                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 319         }
 320
 321         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 322                 s->acceptlocal = blobmsg_get_bool(cur);
 323                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 324         }
 325
 326         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 327                 s->igmpversion = blobmsg_get_u32(cur);
 328                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 329                         s->flags |= DEV_OPT_IGMPVERSION;
 330                 else
 331                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 332         }
 333
 334         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 335                 s->mldversion = blobmsg_get_u32(cur);
 336                 if (s->mldversion >= 1 && s->mldversion <= 2)
 337                         s->flags |= DEV_OPT_MLDVERSION;
 338                 else
 339                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 340         }
 341
 342         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 343                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 344                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 345         }
 346
 347         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 348                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 349                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 350         }
 351
 352         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 353                 s->neigh4locktime = blobmsg_get_u32(cur);
 354                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 355         }
 356
 357         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 358                 s->dadtransmits = blobmsg_get_u32(cur);
 359                 s->flags |= DEV_OPT_DADTRANSMITS;
 360         }
 361
 362         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 363                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 364                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 365         }
 366
 367         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 368                 s->multicast_router = blobmsg_get_u32(cur);
 369                 if (s->multicast_router <= 2)
 370                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 371                 else
 372                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 373         }
 374
 375         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 376                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 377                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 378         }
 379
 380         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 381                 s->multicast = blobmsg_get_bool(cur);
 382                 s->flags |= DEV_OPT_MULTICAST;
 383         }
 384
 385         if ((cur = tb[DEV_ATTR_LEARNING])) {
 386                 s->learning = blobmsg_get_bool(cur);
 387                 s->flags |= DEV_OPT_LEARNING;
 388         }
 389
 390         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 391                 s->unicast_flood = blobmsg_get_bool(cur);
 392                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 393         }
 394
 395         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 396                 s->sendredirects = blobmsg_get_bool(cur);
 397                 s->flags |= DEV_OPT_SENDREDIRECTS;
 398         }
 399
 400         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 401                 s->isolate = blobmsg_get_bool(cur);
 402                 s->flags |= DEV_OPT_ISOLATE;
 403         }
 404
 405         device_set_disabled(dev, disabled);
 406 }
 407
 408 static void __init dev_init(void)
 409 {
 410         avl_init(&devices, avl_strcmp, true, NULL);
 411 }
 412
 413 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 414 {
 415         struct device_user *dep = container_of(list, struct device_user, list);
 416         int *ev = ctx;
 417
 418         /* device might have been removed by an earlier callback */
 419         if (!dep->dev)
 420                 return 0;
 421
 422         if (dep->cb)
 423                 dep->cb(dep, *ev);
 424         return 0;
 425 }
 426
 427 void device_broadcast_event(struct device *dev, enum device_event ev)
 428 {
 429         int dev_ev = ev;
 430
 431         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 432         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 433 }
 434
 435 static void
 436 device_fill_default_settings(struct device *dev)
 437 {
 438         struct device_settings *s = &dev->settings;
 439         struct ether_addr *ea;
 440
 441         if (!(s->flags & DEV_OPT_MACADDR)) {
 442                 ea = config_get_default_macaddr(dev->ifname);
 443                 if (ea) {
 444                         memcpy(s->macaddr, ea, 6);
 445                         s->flags |= DEV_OPT_DEFAULT_MACADDR;
 446                 }
 447         }
 448 }
 449
 450 int device_claim(struct device_user *dep)
 451 {
 452         struct device *dev = dep->dev;
 453         int ret = 0;
 454
 455         if (dep->claimed)
 456                 return 0;
 457
 458         if (!dev)
 459                 return -1;
 460
 461         dep->claimed = true;
 462         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 463         if (++dev->active != 1)
 464                 return 0;
 465
 466         device_broadcast_event(dev, DEV_EVENT_SETUP);
 467         device_fill_default_settings(dev);
 468         if (dev->external) {
 469                 /* Get ifindex for external claimed devices so a valid   */
 470                 /* ifindex is in place avoiding possible race conditions */
 471                 device_set_ifindex(dev, system_if_resolve(dev));
 472                 if (!dev->ifindex)
 473                         ret = -1;
 474
 475                 system_if_get_settings(dev, &dev->orig_settings);
 476         } else
 477                 ret = dev->set_state(dev, true);
 478
 479         if (ret == 0)
 480                 device_broadcast_event(dev, DEV_EVENT_UP);
 481         else {
 482                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 483                 dev->active = 0;
 484                 dep->claimed = false;
 485         }
 486
 487         return ret;
 488 }
 489
 490 void device_release(struct device_user *dep)
 491 {
 492         struct device *dev = dep->dev;
 493
 494         if (!dep->claimed)
 495                 return;
 496
 497         dep->claimed = false;
 498         dev->active--;
 499         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 500         assert(dev->active >= 0);
 501
 502         if (dev->active)
 503                 return;
 504
 505         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 506         if (!dev->external)
 507                 dev->set_state(dev, false);
 508
 509         if (dev->active)
 510                 return;
 511
 512         device_broadcast_event(dev, DEV_EVENT_DOWN);
 513 }
 514
 515 int device_check_state(struct device *dev)
 516 {
 517         if (!dev->type->check_state)
 518                 return simple_device_type.check_state(dev);
 519
 520         return dev->type->check_state(dev);
 521 }
 522
 523 int device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 524 {
 525         assert(dev);
 526         assert(type);
 527
 528         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 529         INIT_SAFE_LIST(&dev->users);
 530         INIT_SAFE_LIST(&dev->aliases);
 531         dev->type = type;
 532
 533         if (name) {
 534                 int ret;
 535
 536                 ret = device_set_ifname(dev, name);
 537                 if (ret < 0)
 538                         return ret;
 539         }
 540
 541         if (!dev->set_state)
 542                 dev->set_state = set_device_state;
 543
 544         return 0;
 545 }
 546
 547 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 548 {
 549         int ret;
 550
 551         ret = device_init_virtual(dev, type, ifname);
 552         if (ret < 0)
 553                 return ret;
 554
 555         dev->avl.key = dev->ifname;
 556
 557         ret = avl_insert(&devices, &dev->avl);
 558         if (ret < 0)
 559                 return ret;
 560
 561         system_if_clear_state(dev);
 562
 563         return 0;
 564 }
 565
 566 static struct device *
 567 device_create_default(const char *name, bool external)
 568 {
 569         struct device *dev;
 570
 571         if (!external && system_if_force_external(name))
 572                 return NULL;
 573
 574         D(DEVICE, "Create simple device '%s'\n", name);
 575         dev = calloc(1, sizeof(*dev));
 576         if (!dev)
 577                 return NULL;
 578
 579         dev->external = external;
 580         dev->set_state = simple_device_set_state;
 581
 582         if (device_init(dev, &simple_device_type, name) < 0) {
 583                 device_cleanup(dev);
 584                 free(dev);
 585                 return NULL;
 586         }
 587
 588         dev->default_config = true;
 589         if (external)
 590                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 591
 592         device_check_state(dev);
 593
 594         return dev;
 595 }
 596
 597 struct device *
 598 device_find(const char *name)
 599 {
 600         struct device *dev;
 601
 602         return avl_find_element(&devices, name, dev, avl);
 603 }
 604
 605 struct device *
 606 device_get(const char *name, int create)
 607 {
 608         struct device *dev;
 609
 610         dev = avl_find_element(&devices, name, dev, avl);
 611
 612         if (!dev && strchr(name, '.'))
 613                 return get_vlan_device_chain(name, create);
 614
 615         if (name[0] == '@')
 616                 return device_alias_get(name + 1);
 617
 618         if (dev) {
 619                 if (create > 1 && !dev->external) {
 620                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 621                         dev->external = true;
 622                         device_set_present(dev, true);
 623                 }
 624                 return dev;
 625         }
 626
 627         if (!create)
 628                 return NULL;
 629
 630         return device_create_default(name, create > 1);
 631 }
 632
 633 static void
 634 device_delete(struct device *dev)
 635 {
 636         if (!dev->avl.key)
 637                 return;
 638
 639         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 640         avl_delete(&devices, &dev->avl);
 641         dev->avl.key = NULL;
 642 }
 643
 644 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 645 {
 646         struct device_user *dep = container_of(list, struct device_user, list);
 647         if (dep->cb)
 648                 dep->cb(dep, DEV_EVENT_REMOVE);
 649
 650         device_release(dep);
 651         return 0;
 652 }
 653
 654 void device_cleanup(struct device *dev)
 655 {
 656         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 657         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 658         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 659         device_delete(dev);
 660 }
 661
 662 static void __device_set_present(struct device *dev, bool state)
 663 {
 664         if (dev->present == state)
 665                 return;
 666
 667         dev->present = state;
 668         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 669 }
 670
 671 void
 672 device_refresh_present(struct device *dev)
 673 {
 674         bool state = dev->sys_present;
 675
 676         if (dev->disabled || dev->deferred)
 677                 state = false;
 678
 679         __device_set_present(dev, state);
 680 }
 681
 682 void device_set_present(struct device *dev, bool state)
 683 {
 684         if (dev->sys_present == state)
 685                 return;
 686
 687         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 688         dev->sys_present = state;
 689         device_refresh_present(dev);
 690 }
 691
 692 void device_set_link(struct device *dev, bool state)
 693 {
 694         if (dev->link_active == state)
 695                 return;
 696
 697         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 698
 699         dev->link_active = state;
 700         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 701 }
 702
 703 void device_set_ifindex(struct device *dev, int ifindex)
 704 {
 705         if (dev->ifindex == ifindex)
 706                 return;
 707
 708         dev->ifindex = ifindex;
 709         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 710 }
 711
 712 int device_set_ifname(struct device *dev, const char *name)
 713 {
 714         int ret = 0;
 715
 716         if (!strcmp(dev->ifname, name))
 717                 return 0;
 718
 719         if (strlen(name) > sizeof(dev->ifname) - 1)
 720                 return -1;
 721
 722         if (dev->avl.key)
 723                 avl_delete(&devices, &dev->avl);
 724
 725         strcpy(dev->ifname, name);
 726
 727         if (dev->avl.key)
 728                 ret = avl_insert(&devices, &dev->avl);
 729
 730         if (ret == 0)
 731                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 732
 733         return ret;
 734 }
 735
 736 static int device_refcount(struct device *dev)
 737 {
 738         struct list_head *list;
 739         int count = 0;
 740
 741         list_for_each(list, &dev->users.list)
 742                 count++;
 743
 744         list_for_each(list, &dev->aliases.list)
 745                 count++;
 746
 747         return count;
 748 }
 749
 750 static void
 751 __device_add_user(struct device_user *dep, struct device *dev)
 752 {
 753         struct safe_list *head;
 754
 755         dep->dev = dev;
 756
 757         if (dep->alias)
 758                 head = &dev->aliases;
 759         else
 760                 head = &dev->users;
 761
 762         safe_list_add(&dep->list, head);
 763         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 764
 765         if (dep->cb && dev->present) {
 766                 dep->cb(dep, DEV_EVENT_ADD);
 767                 if (dev->active)
 768                         dep->cb(dep, DEV_EVENT_UP);
 769
 770                 if (dev->link_active)
 771                         dep->cb(dep, DEV_EVENT_LINK_UP);
 772         }
 773 }
 774
 775 void device_add_user(struct device_user *dep, struct device *dev)
 776 {
 777         if (dep->dev == dev)
 778                 return;
 779
 780         if (dep->dev)
 781                 device_remove_user(dep);
 782
 783         if (!dev)
 784                 return;
 785
 786         __device_add_user(dep, dev);
 787 }
 788
 789 static void
 790 device_free(struct device *dev)
 791 {
 792         __devlock++;
 793         free(dev->config);
 794         device_cleanup(dev);
 795         dev->type->free(dev);
 796         __devlock--;
 797 }
 798
 799 static void
 800 __device_free_unused(struct device *dev)
 801 {
 802         if (!safe_list_empty(&dev->users) ||
 803                 !safe_list_empty(&dev->aliases) ||
 804             dev->current_config || __devlock)
 805                 return;
 806
 807         device_free(dev);
 808 }
 809
 810 void device_remove_user(struct device_user *dep)
 811 {
 812         struct device *dev = dep->dev;
 813
 814         if (!dep->dev)
 815                 return;
 816
 817         dep->hotplug = false;
 818         if (dep->claimed)
 819                 device_release(dep);
 820
 821         safe_list_del(&dep->list);
 822         dep->dev = NULL;
 823         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 824         __device_free_unused(dev);
 825 }
 826
 827 void
 828 device_free_unused(struct device *dev)
 829 {
 830         struct device *tmp;
 831
 832         if (dev)
 833                 return __device_free_unused(dev);
 834
 835         avl_for_each_element_safe(&devices, dev, avl, tmp)
 836                 __device_free_unused(dev);
 837 }
 838
 839 void
 840 device_init_pending(void)
 841 {
 842         struct device *dev, *tmp;
 843
 844         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 845                 if (!dev->config_pending)
 846                         continue;
 847
 848                 dev->type->config_init(dev);
 849                 dev->config_pending = false;
 850                 device_check_state(dev);
 851         }
 852 }
 853
 854 bool
 855 device_check_ip6segmentrouting(void)
 856 {
 857         struct device *dev;
 858         bool ip6segmentrouting = false;
 859
 860         avl_for_each_element(&devices, dev, avl)
 861                 ip6segmentrouting |= dev->settings.ip6segmentrouting;
 862
 863         return ip6segmentrouting;
 864 }
 865
 866 static enum dev_change_type
 867 device_set_config(struct device *dev, struct device_type *type,
 868                   struct blob_attr *attr)
 869 {
 870         struct blob_attr *tb[__DEV_ATTR_MAX];
 871         const struct uci_blob_param_list *cfg = type->config_params;
 872
 873         if (type != dev->type)
 874                 return DEV_CONFIG_RECREATE;
 875
 876         if (dev->type->reload)
 877                 return dev->type->reload(dev, attr);
 878
 879         if (uci_blob_check_equal(dev->config, attr, cfg))
 880                 return DEV_CONFIG_NO_CHANGE;
 881
 882         if (cfg == &device_attr_list) {
 883                 memset(tb, 0, sizeof(tb));
 884
 885                 if (attr)
 886                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 887                                 blob_data(attr), blob_len(attr));
 888
 889                 device_init_settings(dev, tb);
 890                 return DEV_CONFIG_RESTART;
 891         } else
 892                 return DEV_CONFIG_RECREATE;
 893 }
 894
 895 enum dev_change_type
 896 device_apply_config(struct device *dev, struct device_type *type,
 897                     struct blob_attr *config)
 898 {
 899         enum dev_change_type change;
 900
 901         change = device_set_config(dev, type, config);
 902         if (dev->external) {
 903                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 904                 change = DEV_CONFIG_APPLIED;
 905         }
 906
 907         switch (change) {
 908                 case DEV_CONFIG_RESTART:
 909                 case DEV_CONFIG_APPLIED:
 910                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 911                         config = blob_memdup(config);
 912                         free(dev->config);
 913                         dev->config = config;
 914                         if (change == DEV_CONFIG_RESTART && dev->present) {
 915                                 int ret = 0;
 916
 917                                 device_set_present(dev, false);
 918                                 if (dev->active && !dev->external) {
 919                                         ret = dev->set_state(dev, false);
 920                                         if (!ret)
 921                                                 ret = dev->set_state(dev, true);
 922                                 }
 923                                 if (!ret)
 924                                         device_set_present(dev, true);
 925                         }
 926                         break;
 927                 case DEV_CONFIG_NO_CHANGE:
 928                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
 929                         break;
 930                 case DEV_CONFIG_RECREATE:
 931                         break;
 932         }
 933
 934         return change;
 935 }
 936
 937 static void
 938 device_replace(struct device *dev, struct device *odev)
 939 {
 940         struct device_user *dep, *tmp;
 941
 942         __devlock++;
 943         if (odev->present)
 944                 device_set_present(odev, false);
 945
 946         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
 947                 device_release(dep);
 948                 safe_list_del(&dep->list);
 949                 __device_add_user(dep, dev);
 950         }
 951         __devlock--;
 952
 953         device_free(odev);
 954 }
 955
 956 void
 957 device_reset_config(void)
 958 {
 959         struct device *dev;
 960
 961         avl_for_each_element(&devices, dev, avl)
 962                 dev->current_config = false;
 963 }
 964
 965 void
 966 device_reset_old(void)
 967 {
 968         struct device *dev, *tmp, *ndev;
 969
 970         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 971                 if (dev->current_config || dev->default_config)
 972                         continue;
 973
 974                 if (dev->type != &simple_device_type)
 975                         continue;
 976
 977                 ndev = device_create_default(dev->ifname, dev->external);
 978                 if (!ndev)
 979                         continue;
 980
 981                 device_replace(ndev, dev);
 982         }
 983 }
 984
 985 struct device *
 986 device_create(const char *name, struct device_type *type,
 987               struct blob_attr *config)
 988 {
 989         struct device *odev = NULL, *dev;
 990         enum dev_change_type change;
 991
 992         odev = device_find(name);
 993         if (odev) {
 994                 odev->current_config = true;
 995                 change = device_apply_config(odev, type, config);
 996                 switch (change) {
 997                 case DEV_CONFIG_RECREATE:
 998                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 999                         device_delete(odev);
1000                         break;
1001                 default:
1002                         return odev;
1003                 }
1004         } else
1005                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
1006
1007         config = blob_memdup(config);
1008         if (!config)
1009                 return NULL;
1010
1011         dev = type->create(name, type, config);
1012         if (!dev)
1013                 return NULL;
1014
1015         dev->current_config = true;
1016         dev->config = config;
1017         if (odev)
1018                 device_replace(dev, odev);
1019
1020         if (!config_init && dev->config_pending) {
1021                 type->config_init(dev);
1022                 dev->config_pending = false;
1023         }
1024
1025         device_check_state(dev);
1026
1027         return dev;
1028 }
1029
1030 void
1031 device_dump_status(struct blob_buf *b, struct device *dev)
1032 {
1033         struct device_settings st;
1034         void *c, *s;
1035
1036         if (!dev) {
1037                 avl_for_each_element(&devices, dev, avl) {
1038                         if (!dev->present)
1039                                 continue;
1040                         c = blobmsg_open_table(b, dev->ifname);
1041                         device_dump_status(b, dev);
1042                         blobmsg_close_table(b, c);
1043                 }
1044
1045                 return;
1046         }
1047
1048         blobmsg_add_u8(b, "external", dev->external);
1049         blobmsg_add_u8(b, "present", dev->present);
1050         blobmsg_add_string(b, "type", dev->type->name);
1051
1052         if (!dev->present)
1053                 return;
1054
1055         blobmsg_add_u8(b, "up", !!dev->active);
1056         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1057
1058         if (dev->type->dump_info)
1059                 dev->type->dump_info(dev, b);
1060         else
1061                 system_if_dump_info(dev, b);
1062
1063         if (dev->active) {
1064                 device_merge_settings(dev, &st);
1065                 if (st.flags & DEV_OPT_MTU)
1066                         blobmsg_add_u32(b, "mtu", st.mtu);
1067                 if (st.flags & DEV_OPT_MTU6)
1068                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1069                 if (st.flags & DEV_OPT_MACADDR)
1070                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1071                 if (st.flags & DEV_OPT_TXQUEUELEN)
1072                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1073                 if (st.flags & DEV_OPT_IPV6)
1074                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1075                 if (st.flags & DEV_OPT_IP6SEGMENTROUTING)
1076                         blobmsg_add_u8(b, "ip6segmentrouting", st.ip6segmentrouting);
1077                 if (st.flags & DEV_OPT_PROMISC)
1078                         blobmsg_add_u8(b, "promisc", st.promisc);
1079                 if (st.flags & DEV_OPT_RPFILTER)
1080                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1081                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1082                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1083                 if (st.flags & DEV_OPT_IGMPVERSION)
1084                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1085                 if (st.flags & DEV_OPT_MLDVERSION)
1086                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1087                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1088                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1089                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1090                 }
1091                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1092                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1093                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1094                 }
1095                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1096                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1097                 if (st.flags & DEV_OPT_DADTRANSMITS)
1098                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1099                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1100                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1101                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1102                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1103                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1104                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1105                 if (st.flags & DEV_OPT_MULTICAST)
1106                         blobmsg_add_u8(b, "multicast", st.multicast);
1107                 if (st.flags & DEV_OPT_LEARNING)
1108                         blobmsg_add_u8(b, "learning", st.learning);
1109                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1110                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1111                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1112                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1113         }
1114
1115         s = blobmsg_open_table(b, "statistics");
1116         if (dev->type->dump_stats)
1117                 dev->type->dump_stats(dev, b);
1118         else
1119                 system_if_dump_stats(dev, b);
1120         blobmsg_close_table(b, s);
1121 }
1122
1123 static void __init simple_device_type_init(void)
1124 {
1125         device_type_add(&simple_device_type);
1126 }