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, false);
 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                 if (!interface_add(iface, config))
 124                         goto error_free_config;
 125         }
 126         return;
 127
 128 error_free_config:
 129         free(config);
 130 error:
 131         free(iface);
 132 }
 133
 134 static void
 135 config_parse_route(struct uci_section *s, bool v6)
 136 {
 137         void *route;
 138
 139         blob_buf_init(&b, 0);
 140         route = blobmsg_open_array(&b, "route");
 141         uci_to_blob(&b, s, &route_attr_list);
 142         blobmsg_close_array(&b, route);
 143         interface_ip_add_route(NULL, blob_data(b.head), v6);
 144 }
 145
 146 static void
 147 config_parse_neighbor(struct uci_section *s, bool v6)
 148 {
 149         void *neighbor;
 150         blob_buf_init(&b,0);
 151         neighbor = blobmsg_open_array(&b, "neighbor");
 152         uci_to_blob(&b,s, &neighbor_attr_list);
 153         blobmsg_close_array(&b, neighbor);
 154         interface_ip_add_neighbor(NULL, blob_data(b.head), v6);
 155 }
 156
 157 static void
 158 config_parse_rule(struct uci_section *s, bool v6)
 159 {
 160         void *rule;
 161
 162         blob_buf_init(&b, 0);
 163         rule = blobmsg_open_array(&b, "rule");
 164         uci_to_blob(&b, s, &rule_attr_list);
 165         blobmsg_close_array(&b, rule);
 166         iprule_add(blob_data(b.head), v6);
 167 }
 168
 169 static void
 170 config_init_devices(void)
 171 {
 172         struct uci_element *e;
 173
 174         uci_foreach_element(&uci_network->sections, e) {
 175                 const struct uci_blob_param_list *params = NULL;
 176                 struct uci_section *s = uci_to_section(e);
 177                 struct device_type *devtype = NULL;
 178                 struct device *dev;
 179                 const char *type, *name;
 180
 181                 if (strcmp(s->type, "device") != 0)
 182                         continue;
 183
 184                 name = uci_lookup_option_string(uci_ctx, s, "name");
 185                 if (!name)
 186                         continue;
 187
 188                 type = uci_lookup_option_string(uci_ctx, s, "type");
 189                 if (type)
 190                         devtype = device_type_get(type);
 191
 192                 if (devtype)
 193                         params = devtype->config_params;
 194                 if (!params)
 195                         params = simple_device_type.config_params;
 196
 197                 blob_buf_init(&b, 0);
 198                 uci_to_blob(&b, s, params);
 199                 if (devtype) {
 200                         dev = device_create(name, devtype, b.head);
 201                         if (!dev)
 202                                 continue;
 203                 } else {
 204                         dev = device_get(name, 1);
 205                         if (!dev)
 206                                 continue;
 207
 208                         dev->current_config = true;
 209                         device_apply_config(dev, dev->type, b.head);
 210                 }
 211                 dev->default_config = false;
 212         }
 213 }
 214
 215 static struct uci_package *
 216 config_init_package(const char *config)
 217 {
 218         struct uci_context *ctx = uci_ctx;
 219         struct uci_package *p = NULL;
 220
 221         if (!ctx) {
 222                 ctx = uci_alloc_context();
 223                 uci_ctx = ctx;
 224
 225                 ctx->flags &= ~UCI_FLAG_STRICT;
 226                 if (config_path)
 227                         uci_set_confdir(ctx, config_path);
 228
 229 #ifdef DUMMY_MODE
 230                 uci_set_savedir(ctx, "./tmp");
 231 #endif
 232         } else {
 233                 p = uci_lookup_package(ctx, config);
 234                 if (p)
 235                         uci_unload(ctx, p);
 236         }
 237
 238         if (uci_load(ctx, config, &p))
 239                 return NULL;
 240
 241         return p;
 242 }
 243
 244 static void
 245 config_init_interfaces(void)
 246 {
 247         struct uci_element *e;
 248
 249         uci_foreach_element(&uci_network->sections, e) {
 250                 struct uci_section *s = uci_to_section(e);
 251
 252                 if (!strcmp(s->type, "interface"))
 253                         config_parse_interface(s, false);
 254         }
 255
 256         uci_foreach_element(&uci_network->sections, e) {
 257                 struct uci_section *s = uci_to_section(e);
 258
 259                 if (!strcmp(s->type, "alias"))
 260                         config_parse_interface(s, true);
 261         }
 262 }
 263
 264 static void
 265 config_init_ip(void)
 266 {
 267         struct interface *iface;
 268         struct uci_element *e;
 269
 270         vlist_for_each_element(&interfaces, iface, node)
 271                 interface_ip_update_start(&iface->config_ip);
 272
 273         uci_foreach_element(&uci_network->sections, e) {
 274                 struct uci_section *s = uci_to_section(e);
 275
 276                 if (!strcmp(s->type, "route"))
 277                         config_parse_route(s, false);
 278                 else if (!strcmp(s->type, "route6"))
 279                         config_parse_route(s, true);
 280                 if (!strcmp(s->type, "neighbor"))
 281                         config_parse_neighbor(s, false);
 282                 else if (!strcmp(s->type, "neighbor6"))
 283                         config_parse_neighbor(s, true);
 284         }
 285
 286         vlist_for_each_element(&interfaces, iface, node)
 287                 interface_ip_update_complete(&iface->config_ip);
 288 }
 289
 290 static void
 291 config_init_rules(void)
 292 {
 293         struct uci_element *e;
 294
 295         iprule_update_start();
 296
 297         uci_foreach_element(&uci_network->sections, e) {
 298                 struct uci_section *s = uci_to_section(e);
 299
 300                 if (!strcmp(s->type, "rule"))
 301                         config_parse_rule(s, false);
 302                 else if (!strcmp(s->type, "rule6"))
 303                         config_parse_rule(s, true);
 304         }
 305
 306         iprule_update_complete();
 307 }
 308
 309 static void
 310 config_init_globals(void)
 311 {
 312         struct uci_section *globals = uci_lookup_section(
 313                         uci_ctx, uci_network, "globals");
 314         if (!globals)
 315                 return;
 316
 317         const char *ula_prefix = uci_lookup_option_string(
 318                         uci_ctx, globals, "ula_prefix");
 319         interface_ip_set_ula_prefix(ula_prefix);
 320 }
 321
 322 static void
 323 config_parse_wireless_device(struct uci_section *s)
 324 {
 325         struct wireless_driver *drv;
 326         const char *driver_name;
 327
 328         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 329         if (!driver_name)
 330                 return;
 331
 332         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 333         if (!drv)
 334                 return;
 335
 336         blob_buf_init(&b, 0);
 337         uci_to_blob(&b, s, drv->device.config);
 338         wireless_device_create(drv, s->e.name, b.head);
 339 }
 340
 341 static void
 342 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 343 {
 344         char *name;
 345
 346         name = alloca(strlen(s->type) + 16);
 347         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 348
 349         blob_buf_init(&b, 0);
 350         uci_to_blob(&b, s, wdev->drv->interface.config);
 351         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 352 }
 353
 354 static void
 355 config_init_wireless(void)
 356 {
 357         struct wireless_device *wdev;
 358         struct uci_element *e;
 359         const char *dev_name;
 360
 361         if (!uci_wireless) {
 362                 DPRINTF("No wireless configuration found\n");
 363                 return;
 364         }
 365
 366         vlist_update(&wireless_devices);
 367
 368         uci_foreach_element(&uci_wireless->sections, e) {
 369                 struct uci_section *s = uci_to_section(e);
 370                 if (strcmp(s->type, "wifi-device") != 0)
 371                         continue;
 372
 373                 config_parse_wireless_device(s);
 374         }
 375
 376         vlist_flush(&wireless_devices);
 377
 378         vlist_for_each_element(&wireless_devices, wdev, node) {
 379                 wdev->vif_idx = 0;
 380                 vlist_update(&wdev->interfaces);
 381         }
 382
 383         uci_foreach_element(&uci_wireless->sections, e) {
 384                 struct uci_section *s = uci_to_section(e);
 385
 386                 if (strcmp(s->type, "wifi-iface") != 0)
 387                         continue;
 388
 389                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 390                 if (!dev_name)
 391                         continue;
 392
 393                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 394                 if (!wdev) {
 395                         DPRINTF("device %s not found!\n", dev_name);
 396                         continue;
 397                 }
 398
 399                 config_parse_wireless_interface(wdev, s);
 400         }
 401
 402         vlist_for_each_element(&wireless_devices, wdev, node)
 403                 vlist_flush(&wdev->interfaces);
 404 }
 405
 406 int
 407 config_init_all(void)
 408 {
 409         int ret = 0;
 410         char *err;
 411
 412         uci_network = config_init_package("network");
 413         if (!uci_network) {
 414                 uci_get_errorstr(uci_ctx, &err, NULL);
 415                 netifd_log_message(L_CRIT, "Failed to load network config (%s)\n", err);
 416                 free(err);
 417                 return -1;
 418         }
 419
 420         uci_wireless = config_init_package("wireless");
 421         if (!uci_wireless && uci_ctx->err != UCI_ERR_NOTFOUND) {
 422                 uci_get_errorstr(uci_ctx, &err, NULL);
 423                 netifd_log_message(L_CRIT, "Failed to load wireless config (%s)\n", err);
 424                 free(err);
 425                 ret = -1;
 426         }
 427
 428         vlist_update(&interfaces);
 429         config_init = true;
 430         device_lock();
 431
 432         device_reset_config();
 433         config_init_devices();
 434         config_init_interfaces();
 435         config_init_ip();
 436         config_init_rules();
 437         config_init_globals();
 438         config_init_wireless();
 439
 440         config_init = false;
 441         device_unlock();
 442
 443         device_reset_old();
 444         device_init_pending();
 445         vlist_flush(&interfaces);
 446         device_free_unused(NULL);
 447         interface_refresh_assignments(false);
 448         interface_start_pending();
 449         wireless_start_pending();
 450
 451         return ret;
 452 }