interface.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include "netifd.h"
   6 #include "device.h"
   7 #include "interface.h"
   8 #include "interface-ip.h"
   9 #include "proto.h"
  10 #include "ubus.h"
  11 #include "config.h"
  12 #include "system.h"
  13
  14 struct vlist_tree interfaces;
  15
  16 enum {
  17         IFACE_ATTR_IFNAME,
  18         IFACE_ATTR_PROTO,
  19         IFACE_ATTR_AUTO,
  20         IFACE_ATTR_MAX
  21 };
  22
  23 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  24         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
  25         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  26         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
  27 };
  28
  29 const struct config_param_list interface_attr_list = {
  30         .n_params = IFACE_ATTR_MAX,
  31         .params = iface_attrs,
  32 };
  33
  34 static void
  35 interface_clear_errors(struct interface *iface)
  36 {
  37         struct interface_error *error, *tmp;
  38
  39         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
  40                 list_del(&error->list);
  41                 free(error);
  42         }
  43 }
  44
  45 void interface_add_error(struct interface *iface, const char *subsystem,
  46                          const char *code, const char **data, int n_data)
  47 {
  48         struct interface_error *error;
  49         int i, len = 0;
  50         int *datalen = NULL;
  51         char *dest;
  52
  53         if (n_data) {
  54                 len = n_data * sizeof(char *);
  55                 datalen = alloca(len);
  56                 for (i = 0; i < n_data; i++) {
  57                         datalen[i] = strlen(data[i]) + 1;
  58                         len += datalen[i];
  59                 }
  60         }
  61
  62         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
  63         if (!error)
  64                 return;
  65
  66         list_add_tail(&error->list, &iface->errors);
  67         error->subsystem = subsystem;
  68         error->code = code;
  69
  70         dest = (char *) &error->data[n_data + 1];
  71         for (i = 0; i < n_data; i++) {
  72                 error->data[i] = dest;
  73                 memcpy(dest, data[i], datalen[i]);
  74                 dest += datalen[i];
  75         }
  76         error->data[n_data] = NULL;
  77 }
  78
  79 static void
  80 interface_event(struct interface *iface, enum interface_event ev)
  81 {
  82         struct interface_user *dep, *tmp;
  83
  84         list_for_each_entry_safe(dep, tmp, &iface->users, list)
  85                 dep->cb(dep, IFEV_UP);
  86
  87         interface_queue_event(iface, ev);
  88 }
  89
  90 static void
  91 mark_interface_down(struct interface *iface)
  92 {
  93         interface_clear_dns(iface);
  94         vlist_flush_all(&iface->proto_addr);
  95         vlist_flush_all(&iface->proto_route);
  96         if (iface->main_dev.dev)
  97                 device_release(&iface->main_dev);
  98         iface->state = IFS_DOWN;
  99 }
 100
 101 static int
 102 __interface_set_up(struct interface *iface)
 103 {
 104         int ret;
 105
 106         if (iface->state != IFS_DOWN)
 107                 return 0;
 108
 109         if (iface->main_dev.dev) {
 110                 ret = device_claim(&iface->main_dev);
 111                 if (ret)
 112                         return ret;
 113         }
 114
 115         iface->state = IFS_SETUP;
 116         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
 117         if (ret) {
 118                 mark_interface_down(iface);
 119                 return ret;
 120         }
 121
 122         return 0;
 123 }
 124
 125 static void
 126 __interface_set_down(struct interface *iface, bool force)
 127 {
 128         interface_clear_errors(iface);
 129
 130         if (iface->state == IFS_DOWN ||
 131                 iface->state == IFS_TEARDOWN)
 132                 return;
 133
 134         iface->state = IFS_TEARDOWN;
 135         interface_event(iface, IFEV_DOWN);
 136         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
 137 }
 138
 139 static void
 140 interface_cb(struct device_user *dep, enum device_event ev)
 141 {
 142         struct interface *iface;
 143         bool new_state;
 144
 145         iface = container_of(dep, struct interface, main_dev);
 146         switch (ev) {
 147         case DEV_EVENT_ADD:
 148                 new_state = true;
 149                 break;
 150         case DEV_EVENT_REMOVE:
 151                 new_state = false;
 152                 break;
 153         default:
 154                 return;
 155         }
 156
 157         interface_set_available(iface, new_state);
 158 }
 159
 160 void
 161 interface_set_available(struct interface *iface, bool new_state)
 162 {
 163         if (iface->available == new_state)
 164                 return;
 165
 166         D(INTERFACE, "Interface '%s', available=%d\n", iface->name, new_state);
 167         iface->available = new_state;
 168
 169         if (new_state) {
 170                 if (iface->autostart && !config_init)
 171                         interface_set_up(iface);
 172         } else
 173                 __interface_set_down(iface, true);
 174 }
 175
 176 void
 177 interface_add_user(struct interface_user *dep, struct interface *iface)
 178 {
 179         dep->iface = iface;
 180         list_add(&dep->list, &iface->users);
 181         if (iface->state == IFS_UP)
 182                 dep->cb(dep, IFEV_UP);
 183 }
 184
 185 void
 186 interface_remove_user(struct interface_user *dep)
 187 {
 188         list_del_init(&dep->list);
 189         dep->iface = NULL;
 190 }
 191
 192 static void
 193 interface_claim_device(struct interface *iface)
 194 {
 195         struct device *dev;
 196
 197         if (iface->proto_handler &&
 198                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 199                 dev = device_get(iface->ifname, true);
 200                 if (dev)
 201                         device_add_user(&iface->main_dev, dev);
 202         }
 203 }
 204
 205
 206 static void
 207 interface_cleanup(struct interface *iface)
 208 {
 209         struct interface_user *dep, *tmp;
 210
 211         list_for_each_entry_safe(dep, tmp, &iface->users, list)
 212                 interface_remove_user(dep);
 213
 214         interface_clear_dns(iface);
 215         interface_clear_errors(iface);
 216         if (iface->main_dev.dev)
 217                 device_remove_user(&iface->main_dev);
 218         iface->l3_dev = &iface->main_dev;
 219         interface_set_proto_state(iface, NULL);
 220 }
 221
 222 static void
 223 interface_do_free(struct interface *iface)
 224 {
 225         interface_cleanup(iface);
 226         free(iface->config);
 227         netifd_ubus_remove_interface(iface);
 228         avl_delete(&interfaces.avl, &iface->node.avl);
 229         free(iface);
 230 }
 231
 232 static void
 233 interface_do_reload(struct interface *iface)
 234 {
 235         interface_cleanup(iface);
 236
 237         interface_claim_device(iface);
 238         proto_init_interface(iface, iface->config);
 239
 240         if (iface->autostart && !config_init)
 241                 interface_set_up(iface);
 242 }
 243
 244 static void
 245 interface_handle_config_change(struct interface *iface)
 246 {
 247         switch(iface->config_state) {
 248         case IFC_NORMAL:
 249                 break;
 250         case IFC_RELOAD:
 251                 interface_do_reload(iface);
 252                 break;
 253         case IFC_REMOVE:
 254                 interface_do_free(iface);
 255                 break;
 256         }
 257 }
 258
 259 static void
 260 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 261 {
 262         struct interface *iface = state->iface;
 263
 264         switch (ev) {
 265         case IFPEV_UP:
 266                 if (iface->state != IFS_SETUP)
 267                         return;
 268
 269                 system_flush_routes();
 270                 iface->state = IFS_UP;
 271                 iface->start_time = system_get_rtime();
 272                 interface_event(iface, IFEV_UP);
 273                 interface_write_resolv_conf();
 274                 break;
 275         case IFPEV_DOWN:
 276                 if (iface->state == IFS_DOWN)
 277                         return;
 278
 279                 system_flush_routes();
 280                 mark_interface_down(iface);
 281                 interface_handle_config_change(iface);
 282                 if (iface->autostart)
 283                         __interface_set_up(iface);
 284                 if (iface->l3_dev->dev)
 285                         device_release(iface->l3_dev);
 286                 break;
 287         case IFPEV_LINK_LOST:
 288                 if (iface->state != IFS_UP)
 289                         return;
 290
 291                 iface->state = IFS_SETUP;
 292                 interface_event(iface, IFEV_DOWN);
 293                 break;
 294         }
 295 }
 296
 297 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 298 {
 299         if (iface->proto) {
 300                 iface->proto->free(iface->proto);
 301                 iface->proto = NULL;
 302         }
 303         iface->state = IFS_DOWN;
 304         iface->proto = state;
 305         if (!state)
 306                 return;
 307
 308         state->proto_event = interface_proto_cb;
 309         state->iface = iface;
 310 }
 311
 312 void
 313 interface_init(struct interface *iface, const char *name,
 314                struct blob_attr *config)
 315 {
 316         struct blob_attr *tb[IFACE_ATTR_MAX];
 317         struct blob_attr *cur;
 318         const char *proto_name = NULL;
 319
 320         strncpy(iface->name, name, sizeof(iface->name) - 1);
 321         INIT_LIST_HEAD(&iface->errors);
 322         INIT_LIST_HEAD(&iface->users);
 323         INIT_LIST_HEAD(&iface->hotplug_list);
 324         INIT_LIST_HEAD(&iface->proto_dns_search);
 325         INIT_LIST_HEAD(&iface->proto_dns_servers);
 326
 327         iface->main_dev.cb = interface_cb;
 328         iface->l3_dev = &iface->main_dev;
 329
 330         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 331                       blob_data(config), blob_len(config));
 332
 333         if ((cur = tb[IFACE_ATTR_PROTO]))
 334                 proto_name = blobmsg_data(cur);
 335
 336         proto_attach_interface(iface, proto_name);
 337
 338         if ((cur = tb[IFACE_ATTR_AUTO]))
 339                 iface->autostart = blobmsg_get_bool(cur);
 340         else
 341                 iface->autostart = true;
 342         iface->config_autostart = iface->autostart;
 343 }
 344
 345 void
 346 interface_add(struct interface *iface, struct blob_attr *config)
 347 {
 348         struct blob_attr *tb[IFACE_ATTR_MAX];
 349         struct blob_attr *cur;
 350
 351         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 352                       blob_data(config), blob_len(config));
 353
 354         if ((cur = tb[IFACE_ATTR_IFNAME]))
 355                 iface->ifname = blobmsg_data(cur);
 356
 357         iface->config = config;
 358         vlist_add(&interfaces, &iface->node);
 359 }
 360
 361 void
 362 interface_remove_link(struct interface *iface, struct device *dev)
 363 {
 364         struct device *mdev = iface->main_dev.dev;
 365
 366         if (mdev && mdev->hotplug_ops) {
 367                 mdev->hotplug_ops->del(mdev, dev);
 368                 return;
 369         }
 370
 371         device_remove_user(&iface->main_dev);
 372 }
 373
 374 int
 375 interface_add_link(struct interface *iface, struct device *dev)
 376 {
 377         struct device *mdev = iface->main_dev.dev;
 378
 379         if (mdev && mdev->hotplug_ops)
 380                 return mdev->hotplug_ops->add(mdev, dev);
 381
 382         if (iface->main_dev.dev)
 383                 interface_remove_link(iface, NULL);
 384
 385         device_add_user(&iface->main_dev, dev);
 386
 387         return 0;
 388 }
 389
 390 int
 391 interface_set_up(struct interface *iface)
 392 {
 393         iface->autostart = true;
 394
 395         if (iface->state != IFS_DOWN)
 396                 return 0;
 397
 398         interface_clear_errors(iface);
 399         if (!iface->available) {
 400                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 401                 return -1;
 402         }
 403
 404         return __interface_set_up(iface);
 405 }
 406
 407 int
 408 interface_set_down(struct interface *iface)
 409 {
 410         if (!iface) {
 411                 vlist_for_each_element(&interfaces, iface, node)
 412                         __interface_set_down(iface, false);
 413         } else {
 414                 iface->autostart = false;
 415                 __interface_set_down(iface, false);
 416         }
 417
 418         return 0;
 419 }
 420
 421 void
 422 interface_start_pending(void)
 423 {
 424         struct interface *iface;
 425
 426         vlist_for_each_element(&interfaces, iface, node) {
 427                 if (iface->available && iface->autostart)
 428                         interface_set_up(iface);
 429         }
 430 }
 431
 432 static void
 433 set_config_state(struct interface *iface, enum interface_config_state s)
 434 {
 435         iface->config_state = s;
 436         if (iface->state == IFS_DOWN)
 437                 interface_handle_config_change(iface);
 438         else
 439                 __interface_set_down(iface, false);
 440 }
 441
 442 static void
 443 interface_change_config(struct interface *if_old, struct interface *if_new)
 444 {
 445         struct blob_attr *old_config = if_old->config;
 446         const char *old_ifname = if_old->ifname;
 447         const struct proto_handler *proto = if_old->proto_handler;
 448
 449         interface_clear_errors(if_old);
 450         if_old->config = if_new->config;
 451         if (!if_old->config_autostart && if_new->config_autostart)
 452                 if_old->autostart = true;
 453
 454         if_old->config_autostart = if_new->config_autostart;
 455         if_old->ifname = if_new->ifname;
 456         if_old->proto_handler = if_new->proto_handler;
 457
 458         if (strcmp(old_ifname, if_new->ifname) != 0 ||
 459                 proto != if_new->proto_handler) {
 460                 D(INTERFACE, "Reload interface '%s' because of ifname/proto change\n",
 461                   if_old->name);
 462                 goto reload;
 463         }
 464
 465         if (!proto->config_params)
 466                 D(INTERFACE, "No config parameters for interface '%s'\n",
 467                   if_old->name);
 468         else if (!config_check_equal(old_config, if_new->config,
 469                                 proto->config_params)) {
 470                 D(INTERFACE, "Reload interface '%s because of config changes\n",
 471                   if_old->name);
 472                 goto reload;
 473         }
 474
 475         goto out;
 476
 477 reload:
 478         set_config_state(if_old, IFC_RELOAD);
 479 out:
 480         free(old_config);
 481         free(if_new);
 482 }
 483
 484 static void
 485 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 486                  struct vlist_node *node_old)
 487 {
 488         struct interface *if_old = container_of(node_old, struct interface, node);
 489         struct interface *if_new = container_of(node_new, struct interface, node);
 490
 491         if (node_old && node_new) {
 492                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 493                 interface_change_config(if_old, if_new);
 494         } else if (node_old) {
 495                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 496                 set_config_state(if_old, IFC_REMOVE);
 497         } else if (node_new) {
 498                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 499                 interface_claim_device(if_new);
 500                 proto_init_interface(if_new, if_new->config);
 501                 interface_ip_init(if_new);
 502                 netifd_ubus_add_interface(if_new);
 503         }
 504 }
 505
 506
 507 static void __init
 508 interface_init_list(void)
 509 {
 510         vlist_init(&interfaces, avl_strcmp, interface_update,
 511                    struct interface, node, name);
 512         interfaces.keep_old = true;
 513         interfaces.no_delete = true;
 514 }