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