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