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