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         [DEV_ATTR_DROP_V4_UNICAST_IN_L2_MULTICAST] = { .name = "drop_v4_unicast_in_l2_multicast", .type = BLOBMSG_TYPE_BOOL },
  58         [DEV_ATTR_DROP_V6_UNICAST_IN_L2_MULTICAST] = { .name = "drop_v6_unicast_in_l2_multicast", .type = BLOBMSG_TYPE_BOOL },
  59         [DEV_ATTR_DROP_GRATUITOUS_ARP] = { .name = "drop_gratuitous_arp", .type = BLOBMSG_TYPE_BOOL },
  60         [DEV_ATTR_DROP_UNSOLICITED_NA] = { .name = "drop_unsolicited_na", .type = BLOBMSG_TYPE_BOOL },
  61         [DEV_ATTR_ARP_ACCEPT] = { .name = "arp_accept", .type = BLOBMSG_TYPE_BOOL },
  62         [DEV_ATTR_AUTH] = { .name = "auth", .type = BLOBMSG_TYPE_BOOL },
  63 };
  64
  65 const struct uci_blob_param_list device_attr_list = {
  66         .n_params = __DEV_ATTR_MAX,
  67         .params = dev_attrs,
  68 };
  69
  70 static int __devlock = 0;
  71
  72 int device_type_add(struct device_type *devtype)
  73 {
  74         if (device_type_get(devtype->name)) {
  75                 netifd_log_message(L_WARNING, "Device handler '%s' already exists\n",
  76                                    devtype->name);
  77                 return 1;
  78         }
  79
  80         netifd_log_message(L_NOTICE, "Added device handler type: %s\n",
  81                 devtype->name);
  82
  83         list_add(&devtype->list, &devtypes);
  84         return 0;
  85 }
  86
  87 struct device_type *
  88 device_type_get(const char *tname)
  89 {
  90         struct device_type *cur;
  91
  92         list_for_each_entry(cur, &devtypes, list)
  93                 if (!strcmp(cur->name, tname))
  94                         return cur;
  95
  96         return NULL;
  97 }
  98
  99 void device_lock(void)
 100 {
 101         __devlock++;
 102 }
 103
 104 void device_unlock(void)
 105 {
 106         __devlock--;
 107         if (!__devlock)
 108                 device_free_unused(NULL);
 109 }
 110
 111 static int device_vlan_len(struct kvlist *kv, const void *data)
 112 {
 113         return sizeof(unsigned int);
 114 }
 115
 116 void device_vlan_update(bool done)
 117 {
 118         struct device *dev;
 119
 120         avl_for_each_element(&devices, dev, avl) {
 121                 if (!dev->vlans.update)
 122                         continue;
 123
 124                 if (!done) {
 125                         if (dev->vlan_aliases.get_len)
 126                                 kvlist_free(&dev->vlan_aliases);
 127                         else
 128                                 kvlist_init(&dev->vlan_aliases, device_vlan_len);
 129                         vlist_update(&dev->vlans);
 130                 } else {
 131                         vlist_flush(&dev->vlans);
 132
 133                         if (dev->type->vlan_update)
 134                                 dev->type->vlan_update(dev);
 135                 }
 136         }
 137 }
 138
 139 static int set_device_state(struct device *dev, bool state)
 140 {
 141         if (state) {
 142                 /* Get ifindex for all devices being enabled so a valid  */
 143                 /* ifindex is in place avoiding possible race conditions */
 144                 device_set_ifindex(dev, system_if_resolve(dev));
 145                 if (!dev->ifindex)
 146                         return -1;
 147
 148                 system_if_get_settings(dev, &dev->orig_settings);
 149                 /* Only keep orig settings based on what needs to be set */
 150                 dev->orig_settings.valid_flags = dev->orig_settings.flags;
 151                 dev->orig_settings.flags &= dev->settings.flags;
 152                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 153
 154                 system_if_up(dev);
 155         } else {
 156                 system_if_down(dev);
 157                 system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
 158         }
 159
 160         return 0;
 161 }
 162
 163 static int
 164 simple_device_set_state(struct device *dev, bool state)
 165 {
 166         struct device *pdev;
 167         int ret = 0;
 168
 169         pdev = dev->parent.dev;
 170         if (state && !pdev) {
 171                 pdev = system_if_get_parent(dev);
 172                 if (pdev)
 173                         device_add_user(&dev->parent, pdev);
 174         }
 175
 176         if (pdev) {
 177                 if (state)
 178                         ret = device_claim(&dev->parent);
 179                 else
 180                         device_release(&dev->parent);
 181
 182                 if (ret < 0)
 183                         return ret;
 184         }
 185         return set_device_state(dev, state);
 186 }
 187
 188 static struct device *
 189 simple_device_create(const char *name, struct device_type *devtype,
 190                      struct blob_attr *attr)
 191 {
 192         struct blob_attr *tb[__DEV_ATTR_MAX];
 193         struct device *dev = NULL;
 194
 195         /* device type is unused for simple devices */
 196         devtype = NULL;
 197
 198         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
 199         dev = device_get(name, true);
 200         if (!dev)
 201                 return NULL;
 202
 203         dev->set_state = simple_device_set_state;
 204         device_init_settings(dev, tb);
 205
 206         return dev;
 207 }
 208
 209 static void simple_device_free(struct device *dev)
 210 {
 211         if (dev->parent.dev)
 212                 device_remove_user(&dev->parent);
 213         free(dev);
 214 }
 215
 216 struct device_type simple_device_type = {
 217         .name = "Network device",
 218         .config_params = &device_attr_list,
 219
 220         .create = simple_device_create,
 221         .check_state = system_if_check,
 222         .free = simple_device_free,
 223 };
 224
 225 void
 226 device_merge_settings(struct device *dev, struct device_settings *n)
 227 {
 228         struct device_settings *os = &dev->orig_settings;
 229         struct device_settings *s = &dev->settings;
 230
 231         memset(n, 0, sizeof(*n));
 232         n->mtu = s->flags & DEV_OPT_MTU ? s->mtu : os->mtu;
 233         n->mtu6 = s->flags & DEV_OPT_MTU6 ? s->mtu6 : os->mtu6;
 234         n->txqueuelen = s->flags & DEV_OPT_TXQUEUELEN ?
 235                 s->txqueuelen : os->txqueuelen;
 236         memcpy(n->macaddr,
 237                 (s->flags & (DEV_OPT_MACADDR|DEV_OPT_DEFAULT_MACADDR) ? s->macaddr : os->macaddr),
 238                 sizeof(n->macaddr));
 239         n->ipv6 = s->flags & DEV_OPT_IPV6 ? s->ipv6 : os->ipv6;
 240         n->ip6segmentrouting = s->flags & DEV_OPT_IP6SEGMENTROUTING ? s->ip6segmentrouting : os->ip6segmentrouting;
 241         n->promisc = s->flags & DEV_OPT_PROMISC ? s->promisc : os->promisc;
 242         n->rpfilter = s->flags & DEV_OPT_RPFILTER ? s->rpfilter : os->rpfilter;
 243         n->acceptlocal = s->flags & DEV_OPT_ACCEPTLOCAL ? s->acceptlocal : os->acceptlocal;
 244         n->igmpversion = s->flags & DEV_OPT_IGMPVERSION ? s->igmpversion : os->igmpversion;
 245         n->mldversion = s->flags & DEV_OPT_MLDVERSION ? s->mldversion : os->mldversion;
 246         n->neigh4reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 247                 s->neigh4reachabletime : os->neigh4reachabletime;
 248         n->neigh6reachabletime = s->flags & DEV_OPT_NEIGHREACHABLETIME ?
 249                 s->neigh6reachabletime : os->neigh6reachabletime;
 250         n->neigh4gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 251                 s->neigh4gcstaletime : os->neigh4gcstaletime;
 252         n->neigh6gcstaletime = s->flags & DEV_OPT_NEIGHGCSTALETIME ?
 253                 s->neigh6gcstaletime : os->neigh6gcstaletime;
 254         n->neigh4locktime = s->flags & DEV_OPT_NEIGHLOCKTIME ?
 255                 s->neigh4locktime : os->neigh4locktime;
 256         n->dadtransmits = s->flags & DEV_OPT_DADTRANSMITS ?
 257                 s->dadtransmits : os->dadtransmits;
 258         n->multicast = s->flags & DEV_OPT_MULTICAST ?
 259                 s->multicast : os->multicast;
 260         n->multicast_to_unicast = s->multicast_to_unicast;
 261         n->multicast_router = s->multicast_router;
 262         n->multicast_fast_leave = s->multicast_fast_leave;
 263         n->learning = s->learning;
 264         n->unicast_flood = s->unicast_flood;
 265         n->sendredirects = s->flags & DEV_OPT_SENDREDIRECTS ?
 266                 s->sendredirects : os->sendredirects;
 267         n->drop_v4_unicast_in_l2_multicast = s->flags & DEV_OPT_DROP_V4_UNICAST_IN_L2_MULTICAST ?
 268                 s->drop_v4_unicast_in_l2_multicast : os->drop_v4_unicast_in_l2_multicast;
 269         n->drop_v6_unicast_in_l2_multicast = s->flags & DEV_OPT_DROP_V6_UNICAST_IN_L2_MULTICAST ?
 270                 s->drop_v6_unicast_in_l2_multicast : os->drop_v6_unicast_in_l2_multicast;
 271         n->drop_gratuitous_arp = s->flags & DEV_OPT_DROP_GRATUITOUS_ARP ?
 272                 s->drop_gratuitous_arp : os->drop_gratuitous_arp;
 273         n->drop_unsolicited_na = s->flags & DEV_OPT_DROP_UNSOLICITED_NA ?
 274                 s->drop_unsolicited_na : os->drop_unsolicited_na;
 275         n->arp_accept = s->flags & DEV_OPT_ARP_ACCEPT ?
 276                 s->arp_accept : os->arp_accept;
 277         n->auth = s->flags & DEV_OPT_AUTH ? s->auth : os->auth;
 278         n->flags = s->flags | os->flags | os->valid_flags;
 279 }
 280
 281 void
 282 device_init_settings(struct device *dev, struct blob_attr **tb)
 283 {
 284         struct device_settings *s = &dev->settings;
 285         struct blob_attr *cur;
 286         struct ether_addr *ea;
 287         bool disabled = false;
 288
 289         s->flags = 0;
 290         if ((cur = tb[DEV_ATTR_ENABLED]))
 291                 disabled = !blobmsg_get_bool(cur);
 292
 293         if ((cur = tb[DEV_ATTR_MTU]) && blobmsg_get_u32(cur) >= 68) {
 294                 s->mtu = blobmsg_get_u32(cur);
 295                 s->flags |= DEV_OPT_MTU;
 296         }
 297
 298         if ((cur = tb[DEV_ATTR_MTU6]) && blobmsg_get_u32(cur) >= 1280) {
 299                 s->mtu6 = blobmsg_get_u32(cur);
 300                 s->flags |= DEV_OPT_MTU6;
 301         }
 302
 303         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
 304                 s->txqueuelen = blobmsg_get_u32(cur);
 305                 s->flags |= DEV_OPT_TXQUEUELEN;
 306         }
 307
 308         if ((cur = tb[DEV_ATTR_MACADDR])) {
 309                 ea = ether_aton(blobmsg_data(cur));
 310                 if (ea) {
 311                         memcpy(s->macaddr, ea, 6);
 312                         s->flags |= DEV_OPT_MACADDR;
 313                 }
 314         }
 315
 316         if ((cur = tb[DEV_ATTR_IPV6])) {
 317                 s->ipv6 = blobmsg_get_bool(cur);
 318                 s->flags |= DEV_OPT_IPV6;
 319         }
 320
 321         if ((cur = tb[DEV_ATTR_IP6SEGMENTROUTING])) {
 322                 s->ip6segmentrouting = blobmsg_get_bool(cur);
 323                 s->flags |= DEV_OPT_IP6SEGMENTROUTING;
 324         }
 325
 326         if ((cur = tb[DEV_ATTR_PROMISC])) {
 327                 s->promisc = blobmsg_get_bool(cur);
 328                 s->flags |= DEV_OPT_PROMISC;
 329         }
 330
 331         if ((cur = tb[DEV_ATTR_RPFILTER])) {
 332                 if (system_resolve_rpfilter(blobmsg_data(cur), &s->rpfilter))
 333                         s->flags |= DEV_OPT_RPFILTER;
 334                 else
 335                         DPRINTF("Failed to resolve rpfilter: %s\n", (char *) blobmsg_data(cur));
 336         }
 337
 338         if ((cur = tb[DEV_ATTR_ACCEPTLOCAL])) {
 339                 s->acceptlocal = blobmsg_get_bool(cur);
 340                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 341         }
 342
 343         if ((cur = tb[DEV_ATTR_IGMPVERSION])) {
 344                 s->igmpversion = blobmsg_get_u32(cur);
 345                 if (s->igmpversion >= 1 && s->igmpversion <= 3)
 346                         s->flags |= DEV_OPT_IGMPVERSION;
 347                 else
 348                         DPRINTF("Failed to resolve igmpversion: %d\n", blobmsg_get_u32(cur));
 349         }
 350
 351         if ((cur = tb[DEV_ATTR_MLDVERSION])) {
 352                 s->mldversion = blobmsg_get_u32(cur);
 353                 if (s->mldversion >= 1 && s->mldversion <= 2)
 354                         s->flags |= DEV_OPT_MLDVERSION;
 355                 else
 356                         DPRINTF("Failed to resolve mldversion: %d\n", blobmsg_get_u32(cur));
 357         }
 358
 359         if ((cur = tb[DEV_ATTR_NEIGHREACHABLETIME])) {
 360                 s->neigh6reachabletime = s->neigh4reachabletime = blobmsg_get_u32(cur);
 361                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
 362         }
 363
 364         if ((cur = tb[DEV_ATTR_NEIGHGCSTALETIME])) {
 365                 s->neigh6gcstaletime = s->neigh4gcstaletime = blobmsg_get_u32(cur);
 366                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
 367         }
 368
 369         if ((cur = tb[DEV_ATTR_NEIGHLOCKTIME])) {
 370                 s->neigh4locktime = blobmsg_get_u32(cur);
 371                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
 372         }
 373
 374         if ((cur = tb[DEV_ATTR_DADTRANSMITS])) {
 375                 s->dadtransmits = blobmsg_get_u32(cur);
 376                 s->flags |= DEV_OPT_DADTRANSMITS;
 377         }
 378
 379         if ((cur = tb[DEV_ATTR_MULTICAST_TO_UNICAST])) {
 380                 s->multicast_to_unicast = blobmsg_get_bool(cur);
 381                 s->flags |= DEV_OPT_MULTICAST_TO_UNICAST;
 382         }
 383
 384         if ((cur = tb[DEV_ATTR_MULTICAST_ROUTER])) {
 385                 s->multicast_router = blobmsg_get_u32(cur);
 386                 if (s->multicast_router <= 2)
 387                         s->flags |= DEV_OPT_MULTICAST_ROUTER;
 388                 else
 389                         DPRINTF("Invalid value: %d - (Use 0: never, 1: learn, 2: always)\n", blobmsg_get_u32(cur));
 390         }
 391
 392         if ((cur = tb[DEV_ATTR_MULTICAST_FAST_LEAVE])) {
 393                 s->multicast_fast_leave = blobmsg_get_bool(cur);
 394                 s->flags |= DEV_OPT_MULTICAST_FAST_LEAVE;
 395         }
 396
 397         if ((cur = tb[DEV_ATTR_MULTICAST])) {
 398                 s->multicast = blobmsg_get_bool(cur);
 399                 s->flags |= DEV_OPT_MULTICAST;
 400         }
 401
 402         if ((cur = tb[DEV_ATTR_LEARNING])) {
 403                 s->learning = blobmsg_get_bool(cur);
 404                 s->flags |= DEV_OPT_LEARNING;
 405         }
 406
 407         if ((cur = tb[DEV_ATTR_UNICAST_FLOOD])) {
 408                 s->unicast_flood = blobmsg_get_bool(cur);
 409                 s->flags |= DEV_OPT_UNICAST_FLOOD;
 410         }
 411
 412         if ((cur = tb[DEV_ATTR_SENDREDIRECTS])) {
 413                 s->sendredirects = blobmsg_get_bool(cur);
 414                 s->flags |= DEV_OPT_SENDREDIRECTS;
 415         }
 416
 417         if ((cur = tb[DEV_ATTR_ISOLATE])) {
 418                 s->isolate = blobmsg_get_bool(cur);
 419                 s->flags |= DEV_OPT_ISOLATE;
 420         }
 421
 422         if ((cur = tb[DEV_ATTR_DROP_V4_UNICAST_IN_L2_MULTICAST])) {
 423                 s->drop_v4_unicast_in_l2_multicast = blobmsg_get_bool(cur);
 424                 s->flags |= DEV_OPT_DROP_V4_UNICAST_IN_L2_MULTICAST;
 425         }
 426
 427         if ((cur = tb[DEV_ATTR_DROP_V6_UNICAST_IN_L2_MULTICAST])) {
 428                 s->drop_v6_unicast_in_l2_multicast = blobmsg_get_bool(cur);
 429                 s->flags |= DEV_OPT_DROP_V6_UNICAST_IN_L2_MULTICAST;
 430         }
 431
 432         if ((cur = tb[DEV_ATTR_DROP_GRATUITOUS_ARP])) {
 433                 s->drop_gratuitous_arp = blobmsg_get_bool(cur);
 434                 s->flags |= DEV_OPT_DROP_GRATUITOUS_ARP;
 435         }
 436
 437         if ((cur = tb[DEV_ATTR_DROP_UNSOLICITED_NA])) {
 438                 s->drop_unsolicited_na = blobmsg_get_bool(cur);
 439                 s->flags |= DEV_OPT_DROP_UNSOLICITED_NA;
 440         }
 441
 442         if ((cur = tb[DEV_ATTR_ARP_ACCEPT])) {
 443                 s->arp_accept = blobmsg_get_bool(cur);
 444                 s->flags |= DEV_OPT_ARP_ACCEPT;
 445         }
 446
 447         if ((cur = tb[DEV_ATTR_AUTH])) {
 448                 s->auth = blobmsg_get_bool(cur);
 449                 s->flags |= DEV_OPT_AUTH;
 450         }
 451
 452         device_set_disabled(dev, disabled);
 453 }
 454
 455 static void __init dev_init(void)
 456 {
 457         avl_init(&devices, avl_strcmp, true, NULL);
 458 }
 459
 460 static int device_broadcast_cb(void *ctx, struct safe_list *list)
 461 {
 462         struct device_user *dep = container_of(list, struct device_user, list);
 463         int *ev = ctx;
 464
 465         /* device might have been removed by an earlier callback */
 466         if (!dep->dev)
 467                 return 0;
 468
 469         if (dep->cb)
 470                 dep->cb(dep, *ev);
 471         return 0;
 472 }
 473
 474 void device_broadcast_event(struct device *dev, enum device_event ev)
 475 {
 476         int dev_ev = ev;
 477
 478         safe_list_for_each(&dev->aliases, device_broadcast_cb, &dev_ev);
 479         safe_list_for_each(&dev->users, device_broadcast_cb, &dev_ev);
 480 }
 481
 482 static void
 483 device_fill_default_settings(struct device *dev)
 484 {
 485         struct device_settings *s = &dev->settings;
 486         struct ether_addr *ea;
 487
 488         if (!(s->flags & DEV_OPT_MACADDR)) {
 489                 ea = config_get_default_macaddr(dev->ifname);
 490                 if (ea) {
 491                         memcpy(s->macaddr, ea, 6);
 492                         s->flags |= DEV_OPT_DEFAULT_MACADDR;
 493                 }
 494         }
 495 }
 496
 497 int device_claim(struct device_user *dep)
 498 {
 499         struct device *dev = dep->dev;
 500         int ret = 0;
 501
 502         if (dep->claimed)
 503                 return 0;
 504
 505         if (!dev)
 506                 return -1;
 507
 508         dep->claimed = true;
 509         D(DEVICE, "Claim %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active + 1);
 510         if (++dev->active != 1)
 511                 return 0;
 512
 513         device_broadcast_event(dev, DEV_EVENT_SETUP);
 514         device_fill_default_settings(dev);
 515         if (dev->external) {
 516                 /* Get ifindex for external claimed devices so a valid   */
 517                 /* ifindex is in place avoiding possible race conditions */
 518                 device_set_ifindex(dev, system_if_resolve(dev));
 519                 if (!dev->ifindex)
 520                         ret = -1;
 521
 522                 system_if_get_settings(dev, &dev->orig_settings);
 523         } else
 524                 ret = dev->set_state(dev, true);
 525
 526         if (ret == 0)
 527                 device_broadcast_event(dev, DEV_EVENT_UP);
 528         else {
 529                 D(DEVICE, "claim %s %s failed: %d\n", dev->type->name, dev->ifname, ret);
 530                 dev->active = 0;
 531                 dep->claimed = false;
 532         }
 533
 534         return ret;
 535 }
 536
 537 void device_release(struct device_user *dep)
 538 {
 539         struct device *dev = dep->dev;
 540
 541         if (!dep->claimed)
 542                 return;
 543
 544         dep->claimed = false;
 545         dev->active--;
 546         D(DEVICE, "Release %s %s, new active count: %d\n", dev->type->name, dev->ifname, dev->active);
 547         assert(dev->active >= 0);
 548
 549         if (dev->active)
 550                 return;
 551
 552         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 553         if (!dev->external)
 554                 dev->set_state(dev, false);
 555
 556         if (dev->active)
 557                 return;
 558
 559         device_broadcast_event(dev, DEV_EVENT_DOWN);
 560 }
 561
 562 int device_check_state(struct device *dev)
 563 {
 564         if (!dev->type->check_state)
 565                 return simple_device_type.check_state(dev);
 566
 567         return dev->type->check_state(dev);
 568 }
 569
 570 int device_init_virtual(struct device *dev, struct device_type *type, const char *name)
 571 {
 572         assert(dev);
 573         assert(type);
 574
 575         D(DEVICE, "Initialize device '%s'\n", name ? name : "");
 576         INIT_SAFE_LIST(&dev->users);
 577         INIT_SAFE_LIST(&dev->aliases);
 578         dev->type = type;
 579
 580         if (name) {
 581                 int ret;
 582
 583                 ret = device_set_ifname(dev, name);
 584                 if (ret < 0)
 585                         return ret;
 586         }
 587
 588         if (!dev->set_state)
 589                 dev->set_state = set_device_state;
 590
 591         return 0;
 592 }
 593
 594 int device_init(struct device *dev, struct device_type *type, const char *ifname)
 595 {
 596         int ret;
 597
 598         ret = device_init_virtual(dev, type, ifname);
 599         if (ret < 0)
 600                 return ret;
 601
 602         dev->avl.key = dev->ifname;
 603
 604         ret = avl_insert(&devices, &dev->avl);
 605         if (ret < 0)
 606                 return ret;
 607
 608         system_if_clear_state(dev);
 609
 610         return 0;
 611 }
 612
 613 static struct device *
 614 device_create_default(const char *name, bool external)
 615 {
 616         struct device *dev;
 617
 618         if (!external && system_if_force_external(name))
 619                 return NULL;
 620
 621         D(DEVICE, "Create simple device '%s'\n", name);
 622         dev = calloc(1, sizeof(*dev));
 623         if (!dev)
 624                 return NULL;
 625
 626         dev->external = external;
 627         dev->set_state = simple_device_set_state;
 628
 629         if (device_init(dev, &simple_device_type, name) < 0) {
 630                 device_cleanup(dev);
 631                 free(dev);
 632                 return NULL;
 633         }
 634
 635         dev->default_config = true;
 636         if (external)
 637                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 638
 639         device_check_state(dev);
 640
 641         return dev;
 642 }
 643
 644 struct device *
 645 device_find(const char *name)
 646 {
 647         struct device *dev;
 648
 649         return avl_find_element(&devices, name, dev, avl);
 650 }
 651
 652 struct device *
 653 device_get(const char *name, int create)
 654 {
 655         struct device *dev;
 656
 657         dev = avl_find_element(&devices, name, dev, avl);
 658
 659         if (!dev && strchr(name, '.'))
 660                 return get_vlan_device_chain(name, create);
 661
 662         if (name[0] == '@')
 663                 return device_alias_get(name + 1);
 664
 665         if (dev) {
 666                 if (create > 1 && !dev->external) {
 667                         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 668                         dev->external = true;
 669                         device_set_present(dev, true);
 670                 }
 671                 return dev;
 672         }
 673
 674         if (!create)
 675                 return NULL;
 676
 677         return device_create_default(name, create > 1);
 678 }
 679
 680 static void
 681 device_delete(struct device *dev)
 682 {
 683         if (!dev->avl.key)
 684                 return;
 685
 686         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 687         avl_delete(&devices, &dev->avl);
 688         dev->avl.key = NULL;
 689 }
 690
 691 static int device_cleanup_cb(void *ctx, struct safe_list *list)
 692 {
 693         struct device_user *dep = container_of(list, struct device_user, list);
 694         if (dep->cb)
 695                 dep->cb(dep, DEV_EVENT_REMOVE);
 696
 697         device_release(dep);
 698         return 0;
 699 }
 700
 701 void device_cleanup(struct device *dev)
 702 {
 703         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 704         safe_list_for_each(&dev->users, device_cleanup_cb, NULL);
 705         safe_list_for_each(&dev->aliases, device_cleanup_cb, NULL);
 706         device_delete(dev);
 707 }
 708
 709 static void __device_set_present(struct device *dev, bool state)
 710 {
 711         if (dev->present == state)
 712                 return;
 713
 714         dev->present = state;
 715         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 716 }
 717
 718 void
 719 device_refresh_present(struct device *dev)
 720 {
 721         bool state = dev->sys_present;
 722
 723         if (dev->disabled || dev->deferred)
 724                 state = false;
 725
 726         __device_set_present(dev, state);
 727 }
 728
 729 void
 730 device_set_auth_status(struct device *dev, bool value)
 731 {
 732         if (dev->auth_status == value)
 733                 return;
 734
 735         dev->auth_status = value;
 736         if (!dev->present)
 737                 return;
 738
 739         if (dev->auth_status) {
 740                 device_broadcast_event(dev, DEV_EVENT_AUTH_UP);
 741                 return;
 742         }
 743
 744         device_broadcast_event(dev, DEV_EVENT_LINK_DOWN);
 745         if (!dev->link_active)
 746                 return;
 747
 748         device_broadcast_event(dev, DEV_EVENT_LINK_UP);
 749 }
 750
 751 void device_set_present(struct device *dev, bool state)
 752 {
 753         if (dev->sys_present == state)
 754                 return;
 755
 756         D(DEVICE, "%s '%s' %s present\n", dev->type->name, dev->ifname, state ? "is now" : "is no longer" );
 757         dev->sys_present = state;
 758         device_refresh_present(dev);
 759 }
 760
 761 void device_set_link(struct device *dev, bool state)
 762 {
 763         if (dev->link_active == state)
 764                 return;
 765
 766         netifd_log_message(L_NOTICE, "%s '%s' link is %s\n", dev->type->name, dev->ifname, state ? "up" : "down" );
 767
 768         dev->link_active = state;
 769         if (!state)
 770                 dev->auth_status = false;
 771         device_broadcast_event(dev, state ? DEV_EVENT_LINK_UP : DEV_EVENT_LINK_DOWN);
 772 }
 773
 774 void device_set_ifindex(struct device *dev, int ifindex)
 775 {
 776         if (dev->ifindex == ifindex)
 777                 return;
 778
 779         dev->ifindex = ifindex;
 780         device_broadcast_event(dev, DEV_EVENT_UPDATE_IFINDEX);
 781 }
 782
 783 int device_set_ifname(struct device *dev, const char *name)
 784 {
 785         int ret = 0;
 786
 787         if (!strcmp(dev->ifname, name))
 788                 return 0;
 789
 790         if (strlen(name) > sizeof(dev->ifname) - 1)
 791                 return -1;
 792
 793         if (dev->avl.key)
 794                 avl_delete(&devices, &dev->avl);
 795
 796         strcpy(dev->ifname, name);
 797
 798         if (dev->avl.key)
 799                 ret = avl_insert(&devices, &dev->avl);
 800
 801         if (ret == 0)
 802                 device_broadcast_event(dev, DEV_EVENT_UPDATE_IFNAME);
 803
 804         return ret;
 805 }
 806
 807 static int device_refcount(struct device *dev)
 808 {
 809         struct list_head *list;
 810         int count = 0;
 811
 812         list_for_each(list, &dev->users.list)
 813                 count++;
 814
 815         list_for_each(list, &dev->aliases.list)
 816                 count++;
 817
 818         return count;
 819 }
 820
 821 static void
 822 __device_add_user(struct device_user *dep, struct device *dev)
 823 {
 824         struct safe_list *head;
 825
 826         dep->dev = dev;
 827
 828         if (dep->alias)
 829                 head = &dev->aliases;
 830         else
 831                 head = &dev->users;
 832
 833         safe_list_add(&dep->list, head);
 834         D(DEVICE, "Add user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 835
 836         if (dep->cb && dev->present) {
 837                 dep->cb(dep, DEV_EVENT_ADD);
 838                 if (dev->active)
 839                         dep->cb(dep, DEV_EVENT_UP);
 840
 841                 if (dev->link_active)
 842                         dep->cb(dep, DEV_EVENT_LINK_UP);
 843         }
 844 }
 845
 846 void device_add_user(struct device_user *dep, struct device *dev)
 847 {
 848         if (dep->dev == dev)
 849                 return;
 850
 851         if (dep->dev)
 852                 device_remove_user(dep);
 853
 854         if (!dev)
 855                 return;
 856
 857         __device_add_user(dep, dev);
 858 }
 859
 860 static void
 861 device_free(struct device *dev)
 862 {
 863         __devlock++;
 864         free(dev->config);
 865         device_cleanup(dev);
 866         dev->type->free(dev);
 867         __devlock--;
 868 }
 869
 870 static void
 871 __device_free_unused(struct device *dev)
 872 {
 873         if (!safe_list_empty(&dev->users) ||
 874                 !safe_list_empty(&dev->aliases) ||
 875             dev->current_config || __devlock)
 876                 return;
 877
 878         device_free(dev);
 879 }
 880
 881 void device_remove_user(struct device_user *dep)
 882 {
 883         struct device *dev = dep->dev;
 884
 885         if (!dep->dev)
 886                 return;
 887
 888         dep->hotplug = false;
 889         if (dep->claimed)
 890                 device_release(dep);
 891
 892         safe_list_del(&dep->list);
 893         dep->dev = NULL;
 894         D(DEVICE, "Remove user for device '%s', refcount=%d\n", dev->ifname, device_refcount(dev));
 895         __device_free_unused(dev);
 896 }
 897
 898 void
 899 device_free_unused(struct device *dev)
 900 {
 901         struct device *tmp;
 902
 903         if (dev)
 904                 return __device_free_unused(dev);
 905
 906         avl_for_each_element_safe(&devices, dev, avl, tmp)
 907                 __device_free_unused(dev);
 908 }
 909
 910 void
 911 device_init_pending(void)
 912 {
 913         struct device *dev, *tmp;
 914
 915         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 916                 if (!dev->config_pending)
 917                         continue;
 918
 919                 dev->type->config_init(dev);
 920                 dev->config_pending = false;
 921                 device_check_state(dev);
 922         }
 923 }
 924
 925 bool
 926 device_check_ip6segmentrouting(void)
 927 {
 928         struct device *dev;
 929         bool ip6segmentrouting = false;
 930
 931         avl_for_each_element(&devices, dev, avl)
 932                 ip6segmentrouting |= dev->settings.ip6segmentrouting;
 933
 934         return ip6segmentrouting;
 935 }
 936
 937 static enum dev_change_type
 938 device_set_config(struct device *dev, struct device_type *type,
 939                   struct blob_attr *attr)
 940 {
 941         struct blob_attr *tb[__DEV_ATTR_MAX];
 942         const struct uci_blob_param_list *cfg = type->config_params;
 943
 944         if (type != dev->type)
 945                 return DEV_CONFIG_RECREATE;
 946
 947         if (dev->type->reload)
 948                 return dev->type->reload(dev, attr);
 949
 950         if (uci_blob_check_equal(dev->config, attr, cfg))
 951                 return DEV_CONFIG_NO_CHANGE;
 952
 953         if (cfg == &device_attr_list) {
 954                 memset(tb, 0, sizeof(tb));
 955
 956                 if (attr)
 957                         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 958                                 blob_data(attr), blob_len(attr));
 959
 960                 device_init_settings(dev, tb);
 961                 return DEV_CONFIG_RESTART;
 962         } else
 963                 return DEV_CONFIG_RECREATE;
 964 }
 965
 966 enum dev_change_type
 967 device_apply_config(struct device *dev, struct device_type *type,
 968                     struct blob_attr *config)
 969 {
 970         enum dev_change_type change;
 971
 972         change = device_set_config(dev, type, config);
 973         if (dev->external) {
 974                 system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 975                 change = DEV_CONFIG_APPLIED;
 976         }
 977
 978         switch (change) {
 979                 case DEV_CONFIG_RESTART:
 980                 case DEV_CONFIG_APPLIED:
 981                         D(DEVICE, "Device '%s': config applied\n", dev->ifname);
 982                         config = blob_memdup(config);
 983                         free(dev->config);
 984                         dev->config = config;
 985                         if (change == DEV_CONFIG_RESTART && dev->present) {
 986                                 int ret = 0;
 987
 988                                 device_set_present(dev, false);
 989                                 if (dev->active && !dev->external) {
 990                                         ret = dev->set_state(dev, false);
 991                                         if (!ret)
 992                                                 ret = dev->set_state(dev, true);
 993                                 }
 994                                 if (!ret)
 995                                         device_set_present(dev, true);
 996                         }
 997                         break;
 998                 case DEV_CONFIG_NO_CHANGE:
 999                         D(DEVICE, "Device '%s': no configuration change\n", dev->ifname);
1000                         break;
1001                 case DEV_CONFIG_RECREATE:
1002                         break;
1003         }
1004
1005         return change;
1006 }
1007
1008 static void
1009 device_replace(struct device *dev, struct device *odev)
1010 {
1011         struct device_user *dep, *tmp;
1012
1013         __devlock++;
1014         if (odev->present)
1015                 device_set_present(odev, false);
1016
1017         list_for_each_entry_safe(dep, tmp, &odev->users.list, list.list) {
1018                 device_release(dep);
1019                 safe_list_del(&dep->list);
1020                 __device_add_user(dep, dev);
1021         }
1022         __devlock--;
1023
1024         device_free(odev);
1025 }
1026
1027 void
1028 device_reset_config(void)
1029 {
1030         struct device *dev;
1031
1032         avl_for_each_element(&devices, dev, avl)
1033                 dev->current_config = false;
1034 }
1035
1036 void
1037 device_reset_old(void)
1038 {
1039         struct device *dev, *tmp, *ndev;
1040
1041         avl_for_each_element_safe(&devices, dev, avl, tmp) {
1042                 if (dev->current_config || dev->default_config)
1043                         continue;
1044
1045                 if (dev->type != &simple_device_type)
1046                         continue;
1047
1048                 ndev = device_create_default(dev->ifname, dev->external);
1049                 if (!ndev)
1050                         continue;
1051
1052                 device_replace(ndev, dev);
1053         }
1054 }
1055
1056 struct device *
1057 device_create(const char *name, struct device_type *type,
1058               struct blob_attr *config)
1059 {
1060         struct device *odev = NULL, *dev;
1061         enum dev_change_type change;
1062
1063         odev = device_find(name);
1064         if (odev) {
1065                 odev->current_config = true;
1066                 change = device_apply_config(odev, type, config);
1067                 switch (change) {
1068                 case DEV_CONFIG_RECREATE:
1069                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
1070                         device_delete(odev);
1071                         break;
1072                 default:
1073                         return odev;
1074                 }
1075         } else
1076                 D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
1077
1078         config = blob_memdup(config);
1079         if (!config)
1080                 return NULL;
1081
1082         dev = type->create(name, type, config);
1083         if (!dev)
1084                 return NULL;
1085
1086         dev->current_config = true;
1087         dev->config = config;
1088         if (odev)
1089                 device_replace(dev, odev);
1090
1091         if (!config_init && dev->config_pending) {
1092                 type->config_init(dev);
1093                 dev->config_pending = false;
1094         }
1095
1096         device_check_state(dev);
1097
1098         return dev;
1099 }
1100
1101 void
1102 device_dump_status(struct blob_buf *b, struct device *dev)
1103 {
1104         struct device_settings st;
1105         void *c, *s;
1106
1107         if (!dev) {
1108                 avl_for_each_element(&devices, dev, avl) {
1109                         if (!dev->present)
1110                                 continue;
1111                         c = blobmsg_open_table(b, dev->ifname);
1112                         device_dump_status(b, dev);
1113                         blobmsg_close_table(b, c);
1114                 }
1115
1116                 return;
1117         }
1118
1119         blobmsg_add_u8(b, "external", dev->external);
1120         blobmsg_add_u8(b, "present", dev->present);
1121         blobmsg_add_string(b, "type", dev->type->name);
1122
1123         if (!dev->present)
1124                 return;
1125
1126         blobmsg_add_u8(b, "up", !!dev->active);
1127         blobmsg_add_u8(b, "carrier", !!dev->link_active);
1128         blobmsg_add_u8(b, "auth_status", !!dev->auth_status);
1129
1130         if (dev->type->dump_info)
1131                 dev->type->dump_info(dev, b);
1132         else
1133                 system_if_dump_info(dev, b);
1134
1135         if (dev->active) {
1136                 device_merge_settings(dev, &st);
1137                 if (st.flags & DEV_OPT_MTU)
1138                         blobmsg_add_u32(b, "mtu", st.mtu);
1139                 if (st.flags & DEV_OPT_MTU6)
1140                         blobmsg_add_u32(b, "mtu6", st.mtu6);
1141                 if (st.flags & DEV_OPT_MACADDR)
1142                         blobmsg_add_string(b, "macaddr", format_macaddr(st.macaddr));
1143                 if (st.flags & DEV_OPT_TXQUEUELEN)
1144                         blobmsg_add_u32(b, "txqueuelen", st.txqueuelen);
1145                 if (st.flags & DEV_OPT_IPV6)
1146                         blobmsg_add_u8(b, "ipv6", st.ipv6);
1147                 if (st.flags & DEV_OPT_IP6SEGMENTROUTING)
1148                         blobmsg_add_u8(b, "ip6segmentrouting", st.ip6segmentrouting);
1149                 if (st.flags & DEV_OPT_PROMISC)
1150                         blobmsg_add_u8(b, "promisc", st.promisc);
1151                 if (st.flags & DEV_OPT_RPFILTER)
1152                         blobmsg_add_u32(b, "rpfilter", st.rpfilter);
1153                 if (st.flags & DEV_OPT_ACCEPTLOCAL)
1154                         blobmsg_add_u8(b, "acceptlocal", st.acceptlocal);
1155                 if (st.flags & DEV_OPT_IGMPVERSION)
1156                         blobmsg_add_u32(b, "igmpversion", st.igmpversion);
1157                 if (st.flags & DEV_OPT_MLDVERSION)
1158                         blobmsg_add_u32(b, "mldversion", st.mldversion);
1159                 if (st.flags & DEV_OPT_NEIGHREACHABLETIME) {
1160                         blobmsg_add_u32(b, "neigh4reachabletime", st.neigh4reachabletime);
1161                         blobmsg_add_u32(b, "neigh6reachabletime", st.neigh6reachabletime);
1162                 }
1163                 if (st.flags & DEV_OPT_NEIGHGCSTALETIME) {
1164                         blobmsg_add_u32(b, "neigh4gcstaletime", st.neigh4gcstaletime);
1165                         blobmsg_add_u32(b, "neigh6gcstaletime", st.neigh6gcstaletime);
1166                 }
1167                 if (st.flags & DEV_OPT_NEIGHLOCKTIME)
1168                         blobmsg_add_u32(b, "neigh4locktime", st.neigh4locktime);
1169                 if (st.flags & DEV_OPT_DADTRANSMITS)
1170                         blobmsg_add_u32(b, "dadtransmits", st.dadtransmits);
1171                 if (st.flags & DEV_OPT_MULTICAST_TO_UNICAST)
1172                         blobmsg_add_u8(b, "multicast_to_unicast", st.multicast_to_unicast);
1173                 if (st.flags & DEV_OPT_MULTICAST_ROUTER)
1174                         blobmsg_add_u32(b, "multicast_router", st.multicast_router);
1175                 if (st.flags & DEV_OPT_MULTICAST_FAST_LEAVE)
1176                         blobmsg_add_u8(b, "multicast_fast_leave", st.multicast_fast_leave);
1177                 if (st.flags & DEV_OPT_MULTICAST)
1178                         blobmsg_add_u8(b, "multicast", st.multicast);
1179                 if (st.flags & DEV_OPT_LEARNING)
1180                         blobmsg_add_u8(b, "learning", st.learning);
1181                 if (st.flags & DEV_OPT_UNICAST_FLOOD)
1182                         blobmsg_add_u8(b, "unicast_flood", st.unicast_flood);
1183                 if (st.flags & DEV_OPT_SENDREDIRECTS)
1184                         blobmsg_add_u8(b, "sendredirects", st.sendredirects);
1185                 if (st.flags & DEV_OPT_DROP_V4_UNICAST_IN_L2_MULTICAST)
1186                         blobmsg_add_u8(b, "drop_v4_unicast_in_l2_multicast", st.drop_v4_unicast_in_l2_multicast);
1187                 if (st.flags & DEV_OPT_DROP_V6_UNICAST_IN_L2_MULTICAST)
1188                         blobmsg_add_u8(b, "drop_v6_unicast_in_l2_multicast", st.drop_v6_unicast_in_l2_multicast);
1189                 if (st.flags & DEV_OPT_DROP_GRATUITOUS_ARP)
1190                         blobmsg_add_u8(b, "drop_gratuitous_arp", st.drop_gratuitous_arp);
1191                 if (st.flags & DEV_OPT_DROP_UNSOLICITED_NA)
1192                         blobmsg_add_u8(b, "drop_unsolicited_na", st.drop_unsolicited_na);
1193                 if (st.flags & DEV_OPT_ARP_ACCEPT)
1194                         blobmsg_add_u8(b, "arp_accept", st.arp_accept);
1195                 if (st.flags & DEV_OPT_AUTH)
1196                         blobmsg_add_u8(b, "auth", st.auth);
1197         }
1198
1199         s = blobmsg_open_table(b, "statistics");
1200         if (dev->type->dump_stats)
1201                 dev->type->dump_stats(dev, b);
1202         else
1203                 system_if_dump_stats(dev, b);
1204         blobmsg_close_table(b, s);
1205 }
1206
1207 static void __init simple_device_type_init(void)
1208 {
1209         device_type_add(&simple_device_type);
1210 }
1211
1212 void device_hotplug_event(const char *name, bool add)
1213 {
1214         struct device *dev;
1215
1216         dev = device_find(name);
1217         if (!dev || dev->type != &simple_device_type)
1218                 return;
1219
1220         device_set_present(dev, add);
1221 }