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 clear_interface_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         /* TODO */
  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         clear_interface_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         iface->available = new_state;
 161
 162         if (new_state) {
 163                 if (iface->autostart && !config_init)
 164                         interface_set_up(iface);
 165         } else
 166                 __interface_set_down(iface, true);
 167 }
 168
 169 static void
 170 interface_claim_device(struct interface *iface)
 171 {
 172         struct device *dev;
 173
 174         if (iface->proto_handler &&
 175                 !(iface->proto_handler->flags & PROTO_FLAG_NODEV)) {
 176                 dev = device_get(iface->ifname, true);
 177                 if (dev)
 178                         device_add_user(&iface->main_dev, dev);
 179         }
 180 }
 181
 182
 183 static void
 184 interface_cleanup(struct interface *iface)
 185 {
 186         if (iface->main_dev.dev)
 187                 device_remove_user(&iface->main_dev);
 188         interface_set_proto_state(iface, NULL);
 189 }
 190
 191 static void
 192 interface_do_free(struct interface *iface)
 193 {
 194         interface_cleanup(iface);
 195         free(iface->config);
 196         netifd_ubus_remove_interface(iface);
 197         free(iface);
 198 }
 199
 200 static void
 201 interface_do_reload(struct interface *iface)
 202 {
 203         interface_cleanup(iface);
 204
 205         interface_claim_device(iface);
 206         proto_init_interface(iface, iface->config);
 207
 208         if (iface->autostart)
 209                 interface_set_up(iface);
 210 }
 211
 212 static void
 213 interface_handle_config_change(struct interface *iface)
 214 {
 215         switch(iface->config_state) {
 216         case IFC_NORMAL:
 217                 break;
 218         case IFC_RELOAD:
 219                 interface_do_reload(iface);
 220                 break;
 221         case IFC_REMOVE:
 222                 interface_do_free(iface);
 223                 break;
 224         }
 225 }
 226
 227 static void
 228 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
 229 {
 230         struct interface *iface = state->iface;
 231
 232         switch (ev) {
 233         case IFPEV_UP:
 234                 if (iface->state != IFS_SETUP)
 235                         return;
 236
 237                 iface->state = IFS_UP;
 238                 interface_event(iface, IFEV_UP);
 239                 break;
 240         case IFPEV_DOWN:
 241                 if (iface->state == IFS_DOWN)
 242                         return;
 243
 244                 mark_interface_down(iface);
 245                 interface_handle_config_change(iface);
 246                 break;
 247         case IFPEV_LINK_LOST:
 248                 if (iface->state != IFS_UP)
 249                         return;
 250
 251                 iface->state = IFS_SETUP;
 252                 interface_event(iface, IFEV_DOWN);
 253                 break;
 254         }
 255 }
 256
 257 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
 258 {
 259         if (iface->proto) {
 260                 iface->proto->free(iface->proto);
 261                 iface->proto = NULL;
 262         }
 263         iface->state = IFS_DOWN;
 264         iface->proto = state;
 265         if (!state)
 266                 return;
 267
 268         state->proto_event = interface_proto_cb;
 269         state->iface = iface;
 270 }
 271
 272 void
 273 interface_init(struct interface *iface, const char *name,
 274                struct blob_attr *config)
 275 {
 276         struct blob_attr *tb[IFACE_ATTR_MAX];
 277         struct blob_attr *cur;
 278         const char *proto_name = NULL;
 279
 280         strncpy(iface->name, name, sizeof(iface->name) - 1);
 281         INIT_LIST_HEAD(&iface->errors);
 282
 283         iface->main_dev.cb = interface_cb;
 284         iface->l3_dev = &iface->main_dev;
 285
 286         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 287                       blob_data(config), blob_len(config));
 288
 289         if ((cur = tb[IFACE_ATTR_PROTO]))
 290                 proto_name = blobmsg_data(cur);
 291
 292         proto_attach_interface(iface, proto_name);
 293
 294         if ((cur = tb[IFACE_ATTR_AUTO]))
 295                 iface->autostart = blobmsg_get_bool(cur);
 296         else
 297                 iface->autostart = true;
 298         iface->config_autostart = iface->autostart;
 299 }
 300
 301 void
 302 interface_add(struct interface *iface, struct blob_attr *config)
 303 {
 304         struct blob_attr *tb[IFACE_ATTR_MAX];
 305         struct blob_attr *cur;
 306
 307         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
 308                       blob_data(config), blob_len(config));
 309
 310         if ((cur = tb[IFACE_ATTR_IFNAME])) {
 311                 iface->ifname = blobmsg_data(cur);
 312
 313         }
 314
 315         iface->config = config;
 316         vlist_add(&interfaces, &iface->node);
 317 }
 318
 319 void
 320 interface_remove_link(struct interface *iface, struct device *dev)
 321 {
 322         struct device *mdev = iface->main_dev.dev;
 323
 324         if (mdev && mdev->hotplug_ops) {
 325                 mdev->hotplug_ops->del(mdev, dev);
 326                 return;
 327         }
 328
 329         device_remove_user(&iface->main_dev);
 330 }
 331
 332 int
 333 interface_add_link(struct interface *iface, struct device *dev)
 334 {
 335         struct device *mdev = iface->main_dev.dev;
 336
 337         if (mdev && mdev->hotplug_ops)
 338                 return mdev->hotplug_ops->add(mdev, dev);
 339
 340         if (iface->main_dev.dev)
 341                 interface_remove_link(iface, NULL);
 342
 343         device_add_user(&iface->main_dev, dev);
 344
 345         return 0;
 346 }
 347
 348 int
 349 interface_set_up(struct interface *iface)
 350 {
 351         iface->autostart = true;
 352
 353         if (!iface->available) {
 354                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
 355                 return -1;
 356         }
 357
 358         if (iface->state != IFS_DOWN)
 359                 return 0;
 360
 361         return __interface_set_up(iface);
 362 }
 363
 364 int
 365 interface_set_down(struct interface *iface)
 366 {
 367         if (!iface) {
 368                 vlist_for_each_element(&interfaces, iface, node)
 369                         __interface_set_down(iface, false);
 370         } else {
 371                 iface->autostart = false;
 372                 __interface_set_down(iface, false);
 373         }
 374
 375         return 0;
 376 }
 377
 378 void
 379 interface_start_pending(void)
 380 {
 381         struct interface *iface;
 382
 383         vlist_for_each_element(&interfaces, iface, node) {
 384                 if (iface->available && iface->autostart)
 385                         interface_set_up(iface);
 386         }
 387 }
 388
 389 static void
 390 set_config_state(struct interface *iface, enum interface_config_state s)
 391 {
 392         iface->config_state = s;
 393         if (iface->state == IFS_DOWN)
 394                 interface_handle_config_change(iface);
 395         else
 396                 interface_set_down(iface);
 397 }
 398
 399 static void
 400 interface_change_config(struct interface *if_old, struct interface *if_new)
 401 {
 402         struct blob_attr *old_config = if_old->config;
 403
 404         if_old->config = if_new->config;
 405         if (!if_old->config_autostart && if_new->config_autostart)
 406                 if_old->autostart = true;
 407
 408         if_old->config_autostart = if_new->config_autostart;
 409         if_old->ifname = if_new->ifname;
 410
 411         set_config_state(if_old, IFC_RELOAD);
 412         free(old_config);
 413         free(if_new);
 414 }
 415
 416 static void
 417 interface_update(struct vlist_tree *tree, struct vlist_node *node_new,
 418                  struct vlist_node *node_old)
 419 {
 420         struct interface *if_old = container_of(node_old, struct interface, node);
 421         struct interface *if_new = container_of(node_new, struct interface, node);
 422
 423         if (node_old && node_new) {
 424                 D(INTERFACE, "Update interface '%s'\n", if_new->name);
 425                 interface_change_config(if_old, if_new);
 426         } else if (node_old) {
 427                 D(INTERFACE, "Remove interface '%s'\n", if_old->name);
 428                 set_config_state(if_old, IFC_REMOVE);
 429         } else if (node_new) {
 430                 D(INTERFACE, "Create interface '%s'\n", if_new->name);
 431                 interface_claim_device(if_new);
 432                 proto_init_interface(if_new, if_new->config);
 433                 interface_ip_init(if_new);
 434                 netifd_ubus_add_interface(if_new);
 435         }
 436 }
 437
 438
 439 static void __init
 440 interface_init_list(void)
 441 {
 442         vlist_init(&interfaces, avl_strcmp, interface_update,
 443                    struct interface, node, name);
 444         interfaces.keep_old = true;
 445         interfaces.no_delete = true;
 446 }