device.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <assert.h>
   5
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <net/ethernet.h>
   9
  10 #ifdef linux
  11 #include <netinet/ether.h>
  12 #endif
  13
  14 #include "netifd.h"
  15 #include "system.h"
  16 #include "config.h"
  17
  18 static struct avl_tree devices;
  19
  20 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  21         [DEV_ATTR_TYPE] = { "type", BLOBMSG_TYPE_STRING },
  22         [DEV_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  23         [DEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  24         [DEV_ATTR_MTU] = { "mtu", BLOBMSG_TYPE_INT32 },
  25         [DEV_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
  26         [DEV_ATTR_TXQUEUELEN] = { "txqueuelen", BLOBMSG_TYPE_INT32 },
  27 };
  28
  29 const struct config_param_list device_attr_list = {
  30         .n_params = __DEV_ATTR_MAX,
  31         .params = dev_attrs,
  32 };
  33
  34 static struct device *
  35 simple_device_create(struct blob_attr *attr)
  36 {
  37         struct blob_attr *tb[__DEV_ATTR_MAX];
  38         struct device *dev = NULL;
  39         const char *name;
  40
  41         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
  42         if (!tb[DEV_ATTR_NAME])
  43                 return NULL;
  44
  45         name = blobmsg_data(tb[DEV_ATTR_NAME]);
  46         if (!name)
  47                 return NULL;
  48
  49         dev = device_get(name, true);
  50         if (!dev)
  51                 return NULL;
  52
  53         device_init_settings(dev, tb);
  54
  55         return dev;
  56 }
  57
  58 static void simple_device_free(struct device *dev)
  59 {
  60         device_cleanup(dev);
  61         free(dev);
  62 }
  63
  64 const struct device_type simple_device_type = {
  65         .name = "Network device",
  66         .config_params = &device_attr_list,
  67
  68         .create = simple_device_create,
  69         .check_state = system_if_check,
  70         .free = simple_device_free,
  71 };
  72
  73 void
  74 device_init_settings(struct device *dev, struct blob_attr **tb)
  75 {
  76         struct blob_attr *cur;
  77         struct ether_addr *ea;
  78
  79         dev->flags = 0;
  80
  81         if ((cur = tb[DEV_ATTR_MTU])) {
  82                 dev->mtu = blobmsg_get_u32(cur);
  83                 dev->flags |= DEV_OPT_MTU;
  84         }
  85
  86         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
  87                 dev->txqueuelen = blobmsg_get_u32(cur);
  88                 dev->flags |= DEV_OPT_TXQUEUELEN;
  89         }
  90
  91         if ((cur = tb[DEV_ATTR_MACADDR])) {
  92                 ea = ether_aton(blob_data(cur));
  93                 if (ea) {
  94                         memcpy(dev->macaddr, ea, sizeof(dev->macaddr));
  95                         dev->flags |= DEV_OPT_MACADDR;
  96                 }
  97         }
  98 }
  99
 100 static void __init dev_init(void)
 101 {
 102         avl_init(&devices, avl_strcmp, true, NULL);
 103 }
 104
 105 static void device_broadcast_event(struct device *dev, enum device_event ev)
 106 {
 107         struct device_user *dep, *tmp;
 108
 109         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 110                 if (!dep->cb)
 111                         continue;
 112
 113                 dep->cb(dep, ev);
 114         }
 115 }
 116
 117 static int set_device_state(struct device *dev, bool state)
 118 {
 119         if (state)
 120                 system_if_up(dev);
 121         else
 122                 system_if_down(dev);
 123
 124         return 0;
 125 }
 126
 127 int device_claim(struct device_user *dep)
 128 {
 129         struct device *dev = dep->dev;
 130         int ret;
 131
 132         if (dep->claimed)
 133                 return 0;
 134
 135         dep->claimed = true;
 136         D(DEVICE, "claim device %s, new refcount: %d\n", dev->ifname, dev->active + 1);
 137         if (++dev->active != 1)
 138                 return 0;
 139
 140         device_broadcast_event(dev, DEV_EVENT_SETUP);
 141         ret = dev->set_state(dev, true);
 142         if (ret == 0)
 143                 device_broadcast_event(dev, DEV_EVENT_UP);
 144         else
 145                 dev->active = 0;
 146
 147         return ret;
 148 }
 149
 150 void device_release(struct device_user *dep)
 151 {
 152         struct device *dev = dep->dev;
 153
 154         if (!dep->claimed)
 155                 return;
 156
 157         dep->claimed = false;
 158         dev->active--;
 159         D(DEVICE, "release device %s, new refcount: %d\n", dev->ifname, dev->active);
 160         assert(dev->active >= 0);
 161
 162         if (dev->active)
 163                 return;
 164
 165         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 166         dev->set_state(dev, false);
 167         device_broadcast_event(dev, DEV_EVENT_DOWN);
 168 }
 169
 170 int device_check_state(struct device *dev)
 171 {
 172         if (!dev->type->check_state)
 173                 return 0;
 174
 175         return dev->type->check_state(dev);
 176 }
 177
 178 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 179 {
 180         assert(dev);
 181         assert(type);
 182
 183         if (name)
 184                 strncpy(dev->ifname, name, IFNAMSIZ);
 185
 186         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 187         INIT_LIST_HEAD(&dev->users);
 188         dev->type = type;
 189 }
 190
 191 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 192 {
 193         int ret;
 194
 195         device_init_virtual(dev, type, ifname);
 196
 197         if (!dev->set_state)
 198                 dev->set_state = set_device_state;
 199
 200         dev->avl.key = dev->ifname;
 201
 202         ret = avl_insert(&devices, &dev->avl);
 203         if (ret < 0)
 204                 return ret;
 205
 206         device_check_state(dev);
 207
 208         return 0;
 209 }
 210
 211 static struct device *
 212 device_create_default(const char *name)
 213 {
 214         struct device *dev;
 215
 216         D(DEVICE, "Create simple device '%s'\n", name);
 217         dev = calloc(1, sizeof(*dev));
 218         device_init(dev, &simple_device_type, name);
 219         dev->default_config = true;
 220         return dev;
 221 }
 222
 223 struct device *
 224 device_get(const char *name, bool create)
 225 {
 226         struct device *dev;
 227
 228         if (strchr(name, '.'))
 229                 return get_vlan_device_chain(name, create);
 230
 231         dev = avl_find_element(&devices, name, dev, avl);
 232         if (dev)
 233                 return dev;
 234
 235         if (!create)
 236                 return NULL;
 237
 238         return device_create_default(name);
 239 }
 240
 241 static void
 242 device_delete(struct device *dev)
 243 {
 244         if (!dev->avl.key)
 245                 return;
 246
 247         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 248         avl_delete(&devices, &dev->avl);
 249         dev->avl.key = NULL;
 250 }
 251
 252 void device_cleanup(struct device *dev)
 253 {
 254         struct device_user *dep, *tmp;
 255
 256         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 257         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 258                 if (!dep->cb)
 259                         continue;
 260
 261                 dep->cb(dep, DEV_EVENT_REMOVE);
 262         }
 263
 264         device_delete(dev);
 265 }
 266
 267 void device_set_present(struct device *dev, bool state)
 268 {
 269         if (dev->present == state)
 270                 return;
 271
 272         D(DEVICE, "Device '%s' %s present\n", dev->ifname, state ? "is now" : "is no longer" );
 273         dev->present = state;
 274         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 275 }
 276
 277 void device_add_user(struct device_user *dep, struct device *dev)
 278 {
 279         dep->dev = dev;
 280         list_add_tail(&dep->list, &dev->users);
 281         if (dep->cb && dev->present) {
 282                 dep->cb(dep, DEV_EVENT_ADD);
 283                 if (dev->active)
 284                         dep->cb(dep, DEV_EVENT_UP);
 285         }
 286 }
 287
 288 static void
 289 __device_free_unused(struct device *dev)
 290 {
 291         if (!list_empty(&dev->users) || dev->current_config)
 292                 return;
 293
 294         device_free(dev);
 295 }
 296
 297 void device_remove_user(struct device_user *dep)
 298 {
 299         struct device *dev = dep->dev;
 300
 301         if (dep->claimed)
 302                 device_release(dep);
 303
 304         list_del(&dep->list);
 305         dep->dev = NULL;
 306         __device_free_unused(dev);
 307 }
 308
 309 void
 310 device_free_unused(struct device *dev)
 311 {
 312         struct device *tmp;
 313
 314         if (dev)
 315                 return __device_free_unused(dev);
 316
 317         avl_for_each_element_safe(&devices, dev, avl, tmp)
 318                 __device_free_unused(dev);
 319 }
 320
 321 void
 322 device_init_pending(void)
 323 {
 324         struct device *dev, *tmp;
 325
 326         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 327                 if (!dev->config_pending)
 328                         continue;
 329
 330                 dev->type->config_init(dev);
 331                 dev->config_pending = false;
 332         }
 333 }
 334
 335 enum dev_change_type
 336 device_reload_config(struct device *dev, struct blob_attr *attr)
 337 {
 338         struct blob_attr *tb[__DEV_ATTR_MAX], *tb1[__DEV_ATTR_MAX];
 339         const struct config_param_list *params = dev->type->config_params;
 340
 341         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb,
 342                 blob_data(attr), blob_len(attr));
 343         if (dev->config)
 344                 blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb1,
 345                         blob_data(dev->config), blob_len(dev->config));
 346         else
 347                 memset(tb1, 0, sizeof(tb1));
 348
 349         if (!config_diff(tb, tb1, dev->type->config_params, NULL))
 350                 return DEV_CONFIG_NO_CHANGE;
 351
 352         device_init_settings(dev, tb);
 353         if (params == &device_attr_list)
 354                 return DEV_CONFIG_APPLIED;
 355         else
 356                 return DEV_CONFIG_RECREATE;
 357 }
 358
 359 static enum dev_change_type
 360 device_check_config(struct device *dev, const struct device_type *type,
 361                     struct blob_attr *attr)
 362 {
 363         if (type != dev->type)
 364                 return DEV_CONFIG_RECREATE;
 365
 366         if (dev->type->reload)
 367                 return dev->type->reload(dev, attr);
 368
 369         return device_reload_config(dev, attr);
 370 }
 371
 372 static void
 373 device_replace(struct device *dev, struct device *odev)
 374 {
 375         struct device_user *dep, *tmp;
 376         bool present = odev->present;
 377
 378         if (present)
 379                 device_set_present(odev, false);
 380
 381         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 382                 device_remove_user(dep);
 383                 device_add_user(dep, dev);
 384         }
 385         device_free(odev);
 386
 387         if (present)
 388                 device_set_present(dev, true);
 389 }
 390
 391 void
 392 device_reset_config(void)
 393 {
 394         struct device *dev;
 395
 396         avl_for_each_element(&devices, dev, avl)
 397                 dev->current_config = false;
 398 }
 399
 400 void
 401 device_reset_old(void)
 402 {
 403         struct device *dev, *tmp, *ndev;
 404
 405         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 406                 if (dev->current_config || dev->default_config)
 407                         continue;
 408
 409                 if (dev->type != &simple_device_type)
 410                         continue;
 411
 412                 ndev = device_create_default(dev->ifname);
 413                 device_replace(ndev, dev);
 414         }
 415 }
 416
 417 struct device *
 418 device_create(const char *name, const struct device_type *type,
 419               struct blob_attr *config)
 420 {
 421         struct device *odev = NULL, *dev;
 422         enum dev_change_type change;
 423
 424         D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 425         config = config_memdup(config);
 426         if (!config)
 427                 return NULL;
 428
 429         odev = device_get(name, false);
 430         if (odev) {
 431                 odev->current_config = true;
 432                 change = device_check_config(odev, type, config);
 433                 switch (change) {
 434                 case DEV_CONFIG_APPLIED:
 435                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 436                         free(odev->config);
 437                         odev->config = config;
 438                         if (odev->present) {
 439                                 device_set_present(odev, false);
 440                                 device_set_present(odev, true);
 441                         }
 442                         return odev;
 443                 case DEV_CONFIG_NO_CHANGE:
 444                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 445                         free(config);
 446                         return odev;
 447                 case DEV_CONFIG_RECREATE:
 448                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 449                         device_delete(odev);
 450                         break;
 451                 }
 452         }
 453
 454         dev = type->create(config);
 455         if (!dev)
 456                 return NULL;
 457
 458         dev->current_config = true;
 459         dev->config = config;
 460         if (odev)
 461                 device_replace(dev, odev);
 462
 463         if (!config_init && dev->config_pending)
 464                 type->config_init(dev);
 465
 466         return dev;
 467 }