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, struct device_type *devtype)
  57 {
  58         char *name;
  59
  60         name = alloca(strlen(s->e.name) + strlen(devtype->name_prefix) + 2);
  61         sprintf(name, "%s-%s", devtype->name_prefix, s->e.name);
  62         blobmsg_add_string(&b, "name", name);
  63
  64         uci_to_blob(&b, s, devtype->config_params);
  65         if (!device_create(name, devtype, b.head)) {
  66                 D(INTERFACE, "Failed to create '%s' device for interface '%s'\n",
  67                         devtype->name, s->e.name);
  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         bool bridge = false;
  82         struct device_type *devtype = NULL;
  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
  93         if (type)
  94                 devtype = device_type_get(type);
  95
  96         if (devtype && devtype->bridge_capability) {
  97                 if (config_parse_bridge_interface(s, devtype))
  98                         return;
  99
 100                 bridge = true;
 101         }
 102
 103         uci_to_blob(&b, s, &interface_attr_list);
 104
 105         iface = interface_alloc(s->e.name, b.head);
 106         if (!iface)
 107                 return;
 108
 109         if (iface->proto_handler && iface->proto_handler->config_params)
 110                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 111
 112         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 113                 iface->device_config = true;
 114
 115         config = blob_memdup(b.head);
 116         if (!config)
 117                 goto error;
 118
 119         if (alias) {
 120                 if (!interface_add_alias(iface, config))
 121                         goto error_free_config;
 122         } else {
 123                 interface_add(iface, config);
 124         }
 125         return;
 126
 127 error_free_config:
 128         free(config);
 129 error:
 130         free(iface);
 131 }
 132
 133 static void
 134 config_parse_route(struct uci_section *s, bool v6)
 135 {
 136         void *route;
 137
 138         blob_buf_init(&b, 0);
 139         route = blobmsg_open_array(&b, "route");
 140         uci_to_blob(&b, s, &route_attr_list);
 141         blobmsg_close_array(&b, route);
 142         interface_ip_add_route(NULL, blob_data(b.head), v6);
 143 }
 144
 145 static void
 146 config_parse_rule(struct uci_section *s, bool v6)
 147 {
 148         void *rule;
 149
 150         blob_buf_init(&b, 0);
 151         rule = blobmsg_open_array(&b, "rule");
 152         uci_to_blob(&b, s, &rule_attr_list);
 153         blobmsg_close_array(&b, rule);
 154         iprule_add(blob_data(b.head), v6);
 155 }
 156
 157 static void
 158 config_init_devices(void)
 159 {
 160         struct uci_element *e;
 161
 162         uci_foreach_element(&uci_network->sections, e) {
 163                 const struct uci_blob_param_list *params = NULL;
 164                 struct uci_section *s = uci_to_section(e);
 165                 struct device_type *devtype = NULL;
 166                 struct device *dev;
 167                 const char *type, *name;
 168
 169                 if (strcmp(s->type, "device") != 0)
 170                         continue;
 171
 172                 name = uci_lookup_option_string(uci_ctx, s, "name");
 173                 if (!name)
 174                         continue;
 175
 176                 type = uci_lookup_option_string(uci_ctx, s, "type");
 177                 if (type)
 178                         devtype = device_type_get(type);
 179
 180                 if (devtype)
 181                         params = devtype->config_params;
 182                 if (!params)
 183                         params = simple_device_type.config_params;
 184
 185                 blob_buf_init(&b, 0);
 186                 uci_to_blob(&b, s, params);
 187                 if (devtype) {
 188                         dev = device_create(name, devtype, b.head);
 189                         if (!dev)
 190                                 continue;
 191                 } else {
 192                         dev = device_get(name, 1);
 193                         if (!dev)
 194                                 continue;
 195
 196                         dev->current_config = true;
 197                         device_apply_config(dev, dev->type, b.head);
 198                 }
 199                 dev->default_config = false;
 200         }
 201 }
 202
 203 static struct uci_package *
 204 config_init_package(const char *config)
 205 {
 206         struct uci_context *ctx = uci_ctx;
 207         struct uci_package *p = NULL;
 208
 209         if (!ctx) {
 210                 ctx = uci_alloc_context();
 211                 uci_ctx = ctx;
 212
 213                 ctx->flags &= ~UCI_FLAG_STRICT;
 214                 if (config_path)
 215                         uci_set_confdir(ctx, config_path);
 216
 217 #ifdef DUMMY_MODE
 218                 uci_set_savedir(ctx, "./tmp");
 219 #endif
 220         } else {
 221                 p = uci_lookup_package(ctx, config);
 222                 if (p)
 223                         uci_unload(ctx, p);
 224         }
 225
 226         if (uci_load(ctx, config, &p))
 227                 return NULL;
 228
 229         return p;
 230 }
 231
 232 static void
 233 config_init_interfaces(void)
 234 {
 235         struct uci_element *e;
 236
 237         uci_foreach_element(&uci_network->sections, e) {
 238                 struct uci_section *s = uci_to_section(e);
 239
 240                 if (!strcmp(s->type, "interface"))
 241                         config_parse_interface(s, false);
 242         }
 243
 244         uci_foreach_element(&uci_network->sections, e) {
 245                 struct uci_section *s = uci_to_section(e);
 246
 247                 if (!strcmp(s->type, "alias"))
 248                         config_parse_interface(s, true);
 249         }
 250 }
 251
 252 static void
 253 config_init_routes(void)
 254 {
 255         struct interface *iface;
 256         struct uci_element *e;
 257
 258         vlist_for_each_element(&interfaces, iface, node)
 259                 interface_ip_update_start(&iface->config_ip);
 260
 261         uci_foreach_element(&uci_network->sections, e) {
 262                 struct uci_section *s = uci_to_section(e);
 263
 264                 if (!strcmp(s->type, "route"))
 265                         config_parse_route(s, false);
 266                 else if (!strcmp(s->type, "route6"))
 267                         config_parse_route(s, true);
 268         }
 269
 270         vlist_for_each_element(&interfaces, iface, node)
 271                 interface_ip_update_complete(&iface->config_ip);
 272 }
 273
 274 static void
 275 config_init_rules(void)
 276 {
 277         struct uci_element *e;
 278
 279         iprule_update_start();
 280
 281         uci_foreach_element(&uci_network->sections, e) {
 282                 struct uci_section *s = uci_to_section(e);
 283
 284                 if (!strcmp(s->type, "rule"))
 285                         config_parse_rule(s, false);
 286                 else if (!strcmp(s->type, "rule6"))
 287                         config_parse_rule(s, true);
 288         }
 289
 290         iprule_update_complete();
 291 }
 292
 293 static void
 294 config_init_globals(void)
 295 {
 296         struct uci_section *globals = uci_lookup_section(
 297                         uci_ctx, uci_network, "globals");
 298         if (!globals)
 299                 return;
 300
 301         const char *ula_prefix = uci_lookup_option_string(
 302                         uci_ctx, globals, "ula_prefix");
 303         interface_ip_set_ula_prefix(ula_prefix);
 304 }
 305
 306 static void
 307 config_parse_wireless_device(struct uci_section *s)
 308 {
 309         struct wireless_driver *drv;
 310         const char *driver_name;
 311
 312         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 313         if (!driver_name)
 314                 return;
 315
 316         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 317         if (!drv)
 318                 return;
 319
 320         blob_buf_init(&b, 0);
 321         uci_to_blob(&b, s, drv->device.config);
 322         wireless_device_create(drv, s->e.name, b.head);
 323 }
 324
 325 static void
 326 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 327 {
 328         char *name;
 329
 330         name = alloca(strlen(s->type) + 16);
 331         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 332
 333         blob_buf_init(&b, 0);
 334         uci_to_blob(&b, s, wdev->drv->interface.config);
 335         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 336 }
 337
 338 static void
 339 config_init_wireless(void)
 340 {
 341         struct wireless_device *wdev;
 342         struct uci_element *e;
 343         const char *dev_name;
 344
 345         if (!uci_wireless) {
 346                 DPRINTF("No wireless configuration found\n");
 347                 return;
 348         }
 349
 350         vlist_update(&wireless_devices);
 351
 352         uci_foreach_element(&uci_wireless->sections, e) {
 353                 struct uci_section *s = uci_to_section(e);
 354                 if (strcmp(s->type, "wifi-device") != 0)
 355                         continue;
 356
 357                 config_parse_wireless_device(s);
 358         }
 359
 360         vlist_flush(&wireless_devices);
 361
 362         vlist_for_each_element(&wireless_devices, wdev, node) {
 363                 wdev->vif_idx = 0;
 364                 vlist_update(&wdev->interfaces);
 365         }
 366
 367         uci_foreach_element(&uci_wireless->sections, e) {
 368                 struct uci_section *s = uci_to_section(e);
 369
 370                 if (strcmp(s->type, "wifi-iface") != 0)
 371                         continue;
 372
 373                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 374                 if (!dev_name)
 375                         continue;
 376
 377                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 378                 if (!wdev) {
 379                         DPRINTF("device %s not found!\n", dev_name);
 380                         continue;
 381                 }
 382
 383                 config_parse_wireless_interface(wdev, s);
 384         }
 385
 386         vlist_for_each_element(&wireless_devices, wdev, node)
 387                 vlist_flush(&wdev->interfaces);
 388 }
 389
 390 int
 391 config_init_all(void)
 392 {
 393         int ret = 0;
 394         char *err;
 395
 396         uci_network = config_init_package("network");
 397         if (!uci_network) {
 398                 uci_get_errorstr(uci_ctx, &err, NULL);
 399                 netifd_log_message(L_CRIT, "Failed to load network config (%s)\n", err);
 400                 free(err);
 401                 return -1;
 402         }
 403
 404         uci_wireless = config_init_package("wireless");
 405         if (!uci_wireless && uci_ctx->err != UCI_ERR_NOTFOUND) {
 406                 uci_get_errorstr(uci_ctx, &err, NULL);
 407                 netifd_log_message(L_CRIT, "Failed to load wireless config (%s)\n", err);
 408                 free(err);
 409                 ret = -1;
 410         }
 411
 412         vlist_update(&interfaces);
 413         config_init = true;
 414         device_lock();
 415
 416         device_reset_config();
 417         config_init_devices();
 418         config_init_interfaces();
 419         config_init_routes();
 420         config_init_rules();
 421         config_init_globals();
 422         config_init_wireless();
 423
 424         config_init = false;
 425         device_unlock();
 426
 427         device_reset_old();
 428         device_init_pending();
 429         vlist_flush(&interfaces);
 430         device_free_unused(NULL);
 431         interface_refresh_assignments(false);
 432         interface_start_pending();
 433         wireless_start_pending();
 434
 435         return ret;
 436 }