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         device_set_config(dev, dev->type, b.head);
 140         return;
 141 error_free_config:
 142         free(config);
 143 error:
 144         free(iface);
 145 }
 146
 147 static void
 148 config_parse_route(struct uci_section *s, bool v6)
 149 {
 150         void *route;
 151
 152         blob_buf_init(&b, 0);
 153         route = blobmsg_open_array(&b, "route");
 154         uci_to_blob(&b, s, &route_attr_list);
 155         blobmsg_close_array(&b, route);
 156         interface_ip_add_route(NULL, blob_data(b.head), v6);
 157 }
 158
 159 static void
 160 config_parse_rule(struct uci_section *s, bool v6)
 161 {
 162         void *rule;
 163
 164         blob_buf_init(&b, 0);
 165         rule = blobmsg_open_array(&b, "rule");
 166         uci_to_blob(&b, s, &rule_attr_list);
 167         blobmsg_close_array(&b, rule);
 168         iprule_add(blob_data(b.head), v6);
 169 }
 170
 171 static void
 172 config_init_devices(void)
 173 {
 174         struct uci_element *e;
 175
 176         uci_foreach_element(&uci_network->sections, e) {
 177                 struct uci_section *s = uci_to_section(e);
 178                 const struct device_type *devtype = NULL;
 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                         if (!strcmp(type, "8021ad"))
 191                                 devtype = &vlandev_device_type;
 192                         else if (!strcmp(type, "8021q"))
 193                                 devtype = &vlandev_device_type;
 194                         else if (!strcmp(type, "bridge"))
 195                                 devtype = &bridge_device_type;
 196                         else if (!strcmp(type, "macvlan"))
 197                                 devtype = &macvlan_device_type;
 198                         else if (!strcmp(type, "tunnel"))
 199                                 devtype = &tunnel_device_type;
 200                 }
 201
 202                 if (!devtype)
 203                         devtype = &simple_device_type;
 204
 205                 blob_buf_init(&b, 0);
 206                 uci_to_blob(&b, s, devtype->config_params);
 207                 device_create(name, devtype, b.head);
 208         }
 209 }
 210
 211 static struct uci_package *
 212 config_init_package(const char *config)
 213 {
 214         struct uci_context *ctx = uci_ctx;
 215         struct uci_package *p = NULL;
 216
 217         if (!ctx) {
 218                 ctx = uci_alloc_context();
 219                 uci_ctx = ctx;
 220
 221                 ctx->flags &= ~UCI_FLAG_STRICT;
 222                 if (config_path)
 223                         uci_set_confdir(ctx, config_path);
 224
 225 #ifdef DUMMY_MODE
 226                 uci_set_savedir(ctx, "./tmp");
 227 #endif
 228         } else {
 229                 p = uci_lookup_package(ctx, config);
 230                 if (p)
 231                         uci_unload(ctx, p);
 232         }
 233
 234         if (uci_load(ctx, config, &p))
 235                 return NULL;
 236
 237         return p;
 238 }
 239
 240 static void
 241 config_init_interfaces(void)
 242 {
 243         struct uci_element *e;
 244
 245         uci_foreach_element(&uci_network->sections, e) {
 246                 struct uci_section *s = uci_to_section(e);
 247
 248                 if (!strcmp(s->type, "interface"))
 249                         config_parse_interface(s, false);
 250         }
 251
 252         uci_foreach_element(&uci_network->sections, e) {
 253                 struct uci_section *s = uci_to_section(e);
 254
 255                 if (!strcmp(s->type, "alias"))
 256                         config_parse_interface(s, true);
 257         }
 258 }
 259
 260 static void
 261 config_init_routes(void)
 262 {
 263         struct interface *iface;
 264         struct uci_element *e;
 265
 266         vlist_for_each_element(&interfaces, iface, node)
 267                 interface_ip_update_start(&iface->config_ip);
 268
 269         uci_foreach_element(&uci_network->sections, e) {
 270                 struct uci_section *s = uci_to_section(e);
 271
 272                 if (!strcmp(s->type, "route"))
 273                         config_parse_route(s, false);
 274                 else if (!strcmp(s->type, "route6"))
 275                         config_parse_route(s, true);
 276         }
 277
 278         vlist_for_each_element(&interfaces, iface, node)
 279                 interface_ip_update_complete(&iface->config_ip);
 280 }
 281
 282 static void
 283 config_init_rules(void)
 284 {
 285         struct uci_element *e;
 286
 287         iprule_update_start();
 288
 289         uci_foreach_element(&uci_network->sections, e) {
 290                 struct uci_section *s = uci_to_section(e);
 291
 292                 if (!strcmp(s->type, "rule"))
 293                         config_parse_rule(s, false);
 294                 else if (!strcmp(s->type, "rule6"))
 295                         config_parse_rule(s, true);
 296         }
 297
 298         iprule_update_complete();
 299 }
 300
 301 static void
 302 config_init_globals(void)
 303 {
 304         struct uci_section *globals = uci_lookup_section(
 305                         uci_ctx, uci_network, "globals");
 306         if (!globals)
 307                 return;
 308
 309         const char *ula_prefix = uci_lookup_option_string(
 310                         uci_ctx, globals, "ula_prefix");
 311         interface_ip_set_ula_prefix(ula_prefix);
 312 }
 313
 314 static void
 315 config_parse_wireless_device(struct uci_section *s)
 316 {
 317         struct wireless_driver *drv;
 318         const char *driver_name;
 319
 320         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 321         if (!driver_name)
 322                 return;
 323
 324         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 325         if (!drv)
 326                 return;
 327
 328         blob_buf_init(&b, 0);
 329         uci_to_blob(&b, s, drv->device.config);
 330         wireless_device_create(drv, s->e.name, b.head);
 331 }
 332
 333 static void
 334 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 335 {
 336         char *name = NULL;
 337
 338         if (s->anonymous) {
 339                 name = alloca(strlen(s->type) + 16);
 340                 asprintf(&name, "@%s[%d]", s->type, config_section_idx(s));
 341         }
 342
 343         blob_buf_init(&b, 0);
 344         uci_to_blob(&b, s, wdev->drv->interface.config);
 345         wireless_interface_create(wdev, b.head, name ? name : s->e.name);
 346 }
 347
 348 static void
 349 config_init_wireless(void)
 350 {
 351         struct wireless_device *wdev;
 352         struct uci_element *e;
 353         const char *dev_name;
 354
 355         if (!uci_wireless) {
 356                 DPRINTF("No wireless configuration found\n");
 357                 return;
 358         }
 359
 360         vlist_update(&wireless_devices);
 361
 362         uci_foreach_element(&uci_wireless->sections, e) {
 363                 struct uci_section *s = uci_to_section(e);
 364                 if (strcmp(s->type, "wifi-device") != 0)
 365                         continue;
 366
 367                 config_parse_wireless_device(s);
 368         }
 369
 370         vlist_flush(&wireless_devices);
 371
 372         vlist_for_each_element(&wireless_devices, wdev, node) {
 373                 wdev->vif_idx = 0;
 374                 vlist_update(&wdev->interfaces);
 375         }
 376
 377         uci_foreach_element(&uci_wireless->sections, e) {
 378                 struct uci_section *s = uci_to_section(e);
 379
 380                 if (strcmp(s->type, "wifi-iface") != 0)
 381                         continue;
 382
 383                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 384                 if (!dev_name)
 385                         continue;
 386
 387                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 388                 if (!wdev) {
 389                         DPRINTF("device %s not found!\n", dev_name);
 390                         continue;
 391                 }
 392
 393                 config_parse_wireless_interface(wdev, s);
 394         }
 395
 396         vlist_for_each_element(&wireless_devices, wdev, node)
 397                 vlist_flush(&wdev->interfaces);
 398 }
 399
 400 void
 401 config_init_all(void)
 402 {
 403         uci_network = config_init_package("network");
 404         if (!uci_network) {
 405                 fprintf(stderr, "Failed to load network config\n");
 406                 return;
 407         }
 408
 409         uci_wireless = config_init_package("wireless");
 410
 411         vlist_update(&interfaces);
 412         config_init = true;
 413         device_lock();
 414
 415         device_reset_config();
 416         config_init_devices();
 417         config_init_interfaces();
 418         config_init_routes();
 419         config_init_rules();
 420         config_init_globals();
 421         config_init_wireless();
 422
 423         config_init = false;
 424         device_unlock();
 425
 426         device_reset_old();
 427         device_init_pending();
 428         vlist_flush(&interfaces);
 429         device_free_unused(NULL);
 430         interface_refresh_assignments(false);
 431         interface_start_pending();
 432         wireless_start_pending();
 433 }