config.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 #define _GNU_SOURCE
  15 #include <string.h>
  16 #include <stdlib.h>
  17 #include <stdio.h>
  18
  19 #include <uci.h>
  20
  21 #include "netifd.h"
  22 #include "interface.h"
  23 #include "interface-ip.h"
  24 #include "iprule.h"
  25 #include "proto.h"
  26 #include "wireless.h"
  27 #include "config.h"
  28
  29 bool config_init = false;
  30
  31 static struct uci_context *uci_ctx;
  32 static struct uci_package *uci_network;
  33 static struct uci_package *uci_wireless;
  34 static struct blob_buf b;
  35
  36 static int
  37 config_section_idx(struct uci_section *s)
  38 {
  39         struct uci_element *e;
  40         int idx = 0;
  41
  42         uci_foreach_element(&uci_wireless->sections, e) {
  43                 struct uci_section *cur = uci_to_section(e);
  44
  45                 if (s == cur)
  46                         return idx;
  47
  48                 if (!strcmp(cur->type, s->type))
  49                         idx++;
  50         }
  51
  52         return -1;
  53 }
  54
  55 static int
  56 config_parse_bridge_interface(struct uci_section *s)
  57 {
  58         char *name;
  59
  60         name = alloca(strlen(s->e.name) + 4);
  61         sprintf(name, "br-%s", s->e.name);
  62         blobmsg_add_string(&b, "name", name);
  63
  64         uci_to_blob(&b, s, bridge_device_type.config_params);
  65         if (!device_create(name, &bridge_device_type, b.head)) {
  66                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
  67                 return -EINVAL;
  68         }
  69
  70         blob_buf_init(&b, 0);
  71         blobmsg_add_string(&b, "ifname", name);
  72         return 0;
  73 }
  74
  75 static void
  76 config_parse_interface(struct uci_section *s, bool alias)
  77 {
  78         struct interface *iface;
  79         const char *type = NULL, *disabled;
  80         struct blob_attr *config;
  81         struct device *dev;
  82         bool bridge = false;
  83
  84         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
  85         if (disabled && !strcmp(disabled, "1"))
  86                 return;
  87
  88         blob_buf_init(&b, 0);
  89
  90         if (!alias)
  91                 type = uci_lookup_option_string(uci_ctx, s, "type");
  92         if (type && !strcmp(type, "bridge")) {
  93                 if (config_parse_bridge_interface(s))
  94                         return;
  95
  96                 bridge = true;
  97         }
  98
  99         uci_to_blob(&b, s, &interface_attr_list);
 100
 101         iface = interface_alloc(s->e.name, b.head);
 102         if (!iface)
 103                 return;
 104
 105         if (iface->proto_handler && iface->proto_handler->config_params)
 106                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 107
 108         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 109                 iface->device_config = true;
 110
 111         config = blob_memdup(b.head);
 112         if (!config)
 113                 goto error;
 114
 115         if (alias) {
 116                 if (!interface_add_alias(iface, config))
 117                         goto error_free_config;
 118         } else {
 119                 interface_add(iface, config);
 120         }
 121
 122         /*
 123          * need to look up the interface name again, in case of config update,
 124          * the pointer will have changed
 125          */
 126         iface = vlist_find(&interfaces, s->e.name, iface, node);
 127         if (!iface)
 128                 return;
 129
 130         dev = iface->main_dev.dev;
 131         if (!dev || !dev->default_config)
 132                 return;
 133
 134         blob_buf_init(&b, 0);
 135         uci_to_blob(&b, s, dev->type->config_params);
 136         if (blob_len(b.head) == 0)
 137                 return;
 138
 139         if (iface->device_config)
 140                 device_set_config(dev, dev->type, b.head);
 141         return;
 142 error_free_config:
 143         free(config);
 144 error:
 145         free(iface);
 146 }
 147
 148 static void
 149 config_parse_route(struct uci_section *s, bool v6)
 150 {
 151         void *route;
 152
 153         blob_buf_init(&b, 0);
 154         route = blobmsg_open_array(&b, "route");
 155         uci_to_blob(&b, s, &route_attr_list);
 156         blobmsg_close_array(&b, route);
 157         interface_ip_add_route(NULL, blob_data(b.head), v6);
 158 }
 159
 160 static void
 161 config_parse_rule(struct uci_section *s, bool v6)
 162 {
 163         void *rule;
 164
 165         blob_buf_init(&b, 0);
 166         rule = blobmsg_open_array(&b, "rule");
 167         uci_to_blob(&b, s, &rule_attr_list);
 168         blobmsg_close_array(&b, rule);
 169         iprule_add(blob_data(b.head), v6);
 170 }
 171
 172 static void
 173 config_init_devices(void)
 174 {
 175         struct uci_element *e;
 176
 177         uci_foreach_element(&uci_network->sections, e) {
 178                 const struct uci_blob_param_list *params = NULL;
 179                 struct uci_section *s = uci_to_section(e);
 180                 const struct device_type *devtype = NULL;
 181                 struct device *dev;
 182                 const char *type, *name;
 183
 184                 if (strcmp(s->type, "device") != 0)
 185                         continue;
 186
 187                 name = uci_lookup_option_string(uci_ctx, s, "name");
 188                 if (!name)
 189                         continue;
 190
 191                 type = uci_lookup_option_string(uci_ctx, s, "type");
 192                 if (type) {
 193                         if (!strcmp(type, "8021ad"))
 194                                 devtype = &vlandev_device_type;
 195                         else if (!strcmp(type, "8021q"))
 196                                 devtype = &vlandev_device_type;
 197                         else if (!strcmp(type, "bridge"))
 198                                 devtype = &bridge_device_type;
 199                         else if (!strcmp(type, "macvlan"))
 200                                 devtype = &macvlan_device_type;
 201                         else if (!strcmp(type, "tunnel"))
 202                                 devtype = &tunnel_device_type;
 203                 }
 204
 205                 if (devtype)
 206                         params = devtype->config_params;
 207                 if (!params)
 208                         params = simple_device_type.config_params;
 209
 210                 blob_buf_init(&b, 0);
 211                 uci_to_blob(&b, s, params);
 212                 if (devtype) {
 213                         dev = device_create(name, devtype, b.head);
 214                         if (!dev)
 215                                 continue;
 216                 } else {
 217                         dev = device_get(name, 1);
 218                         if (!dev)
 219                                 continue;
 220
 221                         dev->current_config = true;
 222                         device_apply_config(dev, dev->type, b.head);
 223                 }
 224                 dev->default_config = false;
 225         }
 226 }
 227
 228 static struct uci_package *
 229 config_init_package(const char *config)
 230 {
 231         struct uci_context *ctx = uci_ctx;
 232         struct uci_package *p = NULL;
 233
 234         if (!ctx) {
 235                 ctx = uci_alloc_context();
 236                 uci_ctx = ctx;
 237
 238                 ctx->flags &= ~UCI_FLAG_STRICT;
 239                 if (config_path)
 240                         uci_set_confdir(ctx, config_path);
 241
 242 #ifdef DUMMY_MODE
 243                 uci_set_savedir(ctx, "./tmp");
 244 #endif
 245         } else {
 246                 p = uci_lookup_package(ctx, config);
 247                 if (p)
 248                         uci_unload(ctx, p);
 249         }
 250
 251         if (uci_load(ctx, config, &p))
 252                 return NULL;
 253
 254         return p;
 255 }
 256
 257 static void
 258 config_init_interfaces(void)
 259 {
 260         struct uci_element *e;
 261
 262         uci_foreach_element(&uci_network->sections, e) {
 263                 struct uci_section *s = uci_to_section(e);
 264
 265                 if (!strcmp(s->type, "interface"))
 266                         config_parse_interface(s, false);
 267         }
 268
 269         uci_foreach_element(&uci_network->sections, e) {
 270                 struct uci_section *s = uci_to_section(e);
 271
 272                 if (!strcmp(s->type, "alias"))
 273                         config_parse_interface(s, true);
 274         }
 275 }
 276
 277 static void
 278 config_init_routes(void)
 279 {
 280         struct interface *iface;
 281         struct uci_element *e;
 282
 283         vlist_for_each_element(&interfaces, iface, node)
 284                 interface_ip_update_start(&iface->config_ip);
 285
 286         uci_foreach_element(&uci_network->sections, e) {
 287                 struct uci_section *s = uci_to_section(e);
 288
 289                 if (!strcmp(s->type, "route"))
 290                         config_parse_route(s, false);
 291                 else if (!strcmp(s->type, "route6"))
 292                         config_parse_route(s, true);
 293         }
 294
 295         vlist_for_each_element(&interfaces, iface, node)
 296                 interface_ip_update_complete(&iface->config_ip);
 297 }
 298
 299 static void
 300 config_init_rules(void)
 301 {
 302         struct uci_element *e;
 303
 304         iprule_update_start();
 305
 306         uci_foreach_element(&uci_network->sections, e) {
 307                 struct uci_section *s = uci_to_section(e);
 308
 309                 if (!strcmp(s->type, "rule"))
 310                         config_parse_rule(s, false);
 311                 else if (!strcmp(s->type, "rule6"))
 312                         config_parse_rule(s, true);
 313         }
 314
 315         iprule_update_complete();
 316 }
 317
 318 static void
 319 config_init_globals(void)
 320 {
 321         struct uci_section *globals = uci_lookup_section(
 322                         uci_ctx, uci_network, "globals");
 323         if (!globals)
 324                 return;
 325
 326         const char *ula_prefix = uci_lookup_option_string(
 327                         uci_ctx, globals, "ula_prefix");
 328         interface_ip_set_ula_prefix(ula_prefix);
 329 }
 330
 331 static void
 332 config_parse_wireless_device(struct uci_section *s)
 333 {
 334         struct wireless_driver *drv;
 335         const char *driver_name;
 336
 337         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 338         if (!driver_name)
 339                 return;
 340
 341         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 342         if (!drv)
 343                 return;
 344
 345         blob_buf_init(&b, 0);
 346         uci_to_blob(&b, s, drv->device.config);
 347         wireless_device_create(drv, s->e.name, b.head);
 348 }
 349
 350 static void
 351 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 352 {
 353         char *name;
 354
 355         name = alloca(strlen(s->type) + 16);
 356         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 357
 358         blob_buf_init(&b, 0);
 359         uci_to_blob(&b, s, wdev->drv->interface.config);
 360         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 361 }
 362
 363 static void
 364 config_init_wireless(void)
 365 {
 366         struct wireless_device *wdev;
 367         struct uci_element *e;
 368         const char *dev_name;
 369
 370         if (!uci_wireless) {
 371                 DPRINTF("No wireless configuration found\n");
 372                 return;
 373         }
 374
 375         vlist_update(&wireless_devices);
 376
 377         uci_foreach_element(&uci_wireless->sections, e) {
 378                 struct uci_section *s = uci_to_section(e);
 379                 if (strcmp(s->type, "wifi-device") != 0)
 380                         continue;
 381
 382                 config_parse_wireless_device(s);
 383         }
 384
 385         vlist_flush(&wireless_devices);
 386
 387         vlist_for_each_element(&wireless_devices, wdev, node) {
 388                 wdev->vif_idx = 0;
 389                 vlist_update(&wdev->interfaces);
 390         }
 391
 392         uci_foreach_element(&uci_wireless->sections, e) {
 393                 struct uci_section *s = uci_to_section(e);
 394
 395                 if (strcmp(s->type, "wifi-iface") != 0)
 396                         continue;
 397
 398                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 399                 if (!dev_name)
 400                         continue;
 401
 402                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 403                 if (!wdev) {
 404                         DPRINTF("device %s not found!\n", dev_name);
 405                         continue;
 406                 }
 407
 408                 config_parse_wireless_interface(wdev, s);
 409         }
 410
 411         vlist_for_each_element(&wireless_devices, wdev, node)
 412                 vlist_flush(&wdev->interfaces);
 413 }
 414
 415 void
 416 config_init_all(void)
 417 {
 418         uci_network = config_init_package("network");
 419         if (!uci_network) {
 420                 fprintf(stderr, "Failed to load network config\n");
 421                 return;
 422         }
 423
 424         uci_wireless = config_init_package("wireless");
 425
 426         vlist_update(&interfaces);
 427         config_init = true;
 428         device_lock();
 429
 430         device_reset_config();
 431         config_init_devices();
 432         config_init_interfaces();
 433         config_init_routes();
 434         config_init_rules();
 435         config_init_globals();
 436         config_init_wireless();
 437
 438         config_init = false;
 439         device_unlock();
 440
 441         device_reset_old();
 442         device_init_pending();
 443         vlist_flush(&interfaces);
 444         device_free_unused(NULL);
 445         interface_refresh_assignments(false);
 446         interface_start_pending();
 447         wireless_start_pending();
 448 }