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) > 1)
 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 && dev->default_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                         device_apply_config(dev, dev->type, b.head);
 222                 }
 223                 dev->default_config = false;
 224         }
 225 }
 226
 227 static struct uci_package *
 228 config_init_package(const char *config)
 229 {
 230         struct uci_context *ctx = uci_ctx;
 231         struct uci_package *p = NULL;
 232
 233         if (!ctx) {
 234                 ctx = uci_alloc_context();
 235                 uci_ctx = ctx;
 236
 237                 ctx->flags &= ~UCI_FLAG_STRICT;
 238                 if (config_path)
 239                         uci_set_confdir(ctx, config_path);
 240
 241 #ifdef DUMMY_MODE
 242                 uci_set_savedir(ctx, "./tmp");
 243 #endif
 244         } else {
 245                 p = uci_lookup_package(ctx, config);
 246                 if (p)
 247                         uci_unload(ctx, p);
 248         }
 249
 250         if (uci_load(ctx, config, &p))
 251                 return NULL;
 252
 253         return p;
 254 }
 255
 256 static void
 257 config_init_interfaces(void)
 258 {
 259         struct uci_element *e;
 260
 261         uci_foreach_element(&uci_network->sections, e) {
 262                 struct uci_section *s = uci_to_section(e);
 263
 264                 if (!strcmp(s->type, "interface"))
 265                         config_parse_interface(s, false);
 266         }
 267
 268         uci_foreach_element(&uci_network->sections, e) {
 269                 struct uci_section *s = uci_to_section(e);
 270
 271                 if (!strcmp(s->type, "alias"))
 272                         config_parse_interface(s, true);
 273         }
 274 }
 275
 276 static void
 277 config_init_routes(void)
 278 {
 279         struct interface *iface;
 280         struct uci_element *e;
 281
 282         vlist_for_each_element(&interfaces, iface, node)
 283                 interface_ip_update_start(&iface->config_ip);
 284
 285         uci_foreach_element(&uci_network->sections, e) {
 286                 struct uci_section *s = uci_to_section(e);
 287
 288                 if (!strcmp(s->type, "route"))
 289                         config_parse_route(s, false);
 290                 else if (!strcmp(s->type, "route6"))
 291                         config_parse_route(s, true);
 292         }
 293
 294         vlist_for_each_element(&interfaces, iface, node)
 295                 interface_ip_update_complete(&iface->config_ip);
 296 }
 297
 298 static void
 299 config_init_rules(void)
 300 {
 301         struct uci_element *e;
 302
 303         iprule_update_start();
 304
 305         uci_foreach_element(&uci_network->sections, e) {
 306                 struct uci_section *s = uci_to_section(e);
 307
 308                 if (!strcmp(s->type, "rule"))
 309                         config_parse_rule(s, false);
 310                 else if (!strcmp(s->type, "rule6"))
 311                         config_parse_rule(s, true);
 312         }
 313
 314         iprule_update_complete();
 315 }
 316
 317 static void
 318 config_init_globals(void)
 319 {
 320         struct uci_section *globals = uci_lookup_section(
 321                         uci_ctx, uci_network, "globals");
 322         if (!globals)
 323                 return;
 324
 325         const char *ula_prefix = uci_lookup_option_string(
 326                         uci_ctx, globals, "ula_prefix");
 327         interface_ip_set_ula_prefix(ula_prefix);
 328 }
 329
 330 static void
 331 config_parse_wireless_device(struct uci_section *s)
 332 {
 333         struct wireless_driver *drv;
 334         const char *driver_name;
 335
 336         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 337         if (!driver_name)
 338                 return;
 339
 340         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 341         if (!drv)
 342                 return;
 343
 344         blob_buf_init(&b, 0);
 345         uci_to_blob(&b, s, drv->device.config);
 346         wireless_device_create(drv, s->e.name, b.head);
 347 }
 348
 349 static void
 350 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 351 {
 352         char *name;
 353
 354         name = alloca(strlen(s->type) + 16);
 355         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 356
 357         blob_buf_init(&b, 0);
 358         uci_to_blob(&b, s, wdev->drv->interface.config);
 359         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 360 }
 361
 362 static void
 363 config_init_wireless(void)
 364 {
 365         struct wireless_device *wdev;
 366         struct uci_element *e;
 367         const char *dev_name;
 368
 369         if (!uci_wireless) {
 370                 DPRINTF("No wireless configuration found\n");
 371                 return;
 372         }
 373
 374         vlist_update(&wireless_devices);
 375
 376         uci_foreach_element(&uci_wireless->sections, e) {
 377                 struct uci_section *s = uci_to_section(e);
 378                 if (strcmp(s->type, "wifi-device") != 0)
 379                         continue;
 380
 381                 config_parse_wireless_device(s);
 382         }
 383
 384         vlist_flush(&wireless_devices);
 385
 386         vlist_for_each_element(&wireless_devices, wdev, node) {
 387                 wdev->vif_idx = 0;
 388                 vlist_update(&wdev->interfaces);
 389         }
 390
 391         uci_foreach_element(&uci_wireless->sections, e) {
 392                 struct uci_section *s = uci_to_section(e);
 393
 394                 if (strcmp(s->type, "wifi-iface") != 0)
 395                         continue;
 396
 397                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 398                 if (!dev_name)
 399                         continue;
 400
 401                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 402                 if (!wdev) {
 403                         DPRINTF("device %s not found!\n", dev_name);
 404                         continue;
 405                 }
 406
 407                 config_parse_wireless_interface(wdev, s);
 408         }
 409
 410         vlist_for_each_element(&wireless_devices, wdev, node)
 411                 vlist_flush(&wdev->interfaces);
 412 }
 413
 414 void
 415 config_init_all(void)
 416 {
 417         uci_network = config_init_package("network");
 418         if (!uci_network) {
 419                 fprintf(stderr, "Failed to load network config\n");
 420                 return;
 421         }
 422
 423         uci_wireless = config_init_package("wireless");
 424
 425         vlist_update(&interfaces);
 426         config_init = true;
 427         device_lock();
 428
 429         device_reset_config();
 430         config_init_devices();
 431         config_init_interfaces();
 432         config_init_routes();
 433         config_init_rules();
 434         config_init_globals();
 435         config_init_wireless();
 436
 437         config_init = false;
 438         device_unlock();
 439
 440         device_reset_old();
 441         device_init_pending();
 442         vlist_flush(&interfaces);
 443         device_free_unused(NULL);
 444         interface_refresh_assignments(false);
 445         interface_start_pending();
 446         wireless_start_pending();
 447 }