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                 const struct uci_blob_param_list *params = NULL;
 178                 struct uci_section *s = uci_to_section(e);
 179                 const struct device_type *devtype = NULL;
 180                 struct device *dev;
 181                 const char *type, *name;
 182
 183                 if (strcmp(s->type, "device") != 0)
 184                         continue;
 185
 186                 name = uci_lookup_option_string(uci_ctx, s, "name");
 187                 if (!name)
 188                         continue;
 189
 190                 type = uci_lookup_option_string(uci_ctx, s, "type");
 191                 if (type) {
 192                         if (!strcmp(type, "8021ad"))
 193                                 devtype = &vlandev_device_type;
 194                         else if (!strcmp(type, "8021q"))
 195                                 devtype = &vlandev_device_type;
 196                         else if (!strcmp(type, "bridge"))
 197                                 devtype = &bridge_device_type;
 198                         else if (!strcmp(type, "macvlan"))
 199                                 devtype = &macvlan_device_type;
 200                         else if (!strcmp(type, "tunnel"))
 201                                 devtype = &tunnel_device_type;
 202                 }
 203
 204                 if (devtype)
 205                         params = devtype->config_params;
 206                 if (!params)
 207                         params = simple_device_type.config_params;
 208
 209                 blob_buf_init(&b, 0);
 210                 uci_to_blob(&b, s, params);
 211                 if (devtype) {
 212                         device_create(name, devtype, b.head);
 213                 } else {
 214                         dev = device_get(name, 1);
 215                         if (!dev)
 216                                 continue;
 217
 218                         device_set_config(dev, dev->type, b.head);
 219                 }
 220         }
 221 }
 222
 223 static struct uci_package *
 224 config_init_package(const char *config)
 225 {
 226         struct uci_context *ctx = uci_ctx;
 227         struct uci_package *p = NULL;
 228
 229         if (!ctx) {
 230                 ctx = uci_alloc_context();
 231                 uci_ctx = ctx;
 232
 233                 ctx->flags &= ~UCI_FLAG_STRICT;
 234                 if (config_path)
 235                         uci_set_confdir(ctx, config_path);
 236
 237 #ifdef DUMMY_MODE
 238                 uci_set_savedir(ctx, "./tmp");
 239 #endif
 240         } else {
 241                 p = uci_lookup_package(ctx, config);
 242                 if (p)
 243                         uci_unload(ctx, p);
 244         }
 245
 246         if (uci_load(ctx, config, &p))
 247                 return NULL;
 248
 249         return p;
 250 }
 251
 252 static void
 253 config_init_interfaces(void)
 254 {
 255         struct uci_element *e;
 256
 257         uci_foreach_element(&uci_network->sections, e) {
 258                 struct uci_section *s = uci_to_section(e);
 259
 260                 if (!strcmp(s->type, "interface"))
 261                         config_parse_interface(s, false);
 262         }
 263
 264         uci_foreach_element(&uci_network->sections, e) {
 265                 struct uci_section *s = uci_to_section(e);
 266
 267                 if (!strcmp(s->type, "alias"))
 268                         config_parse_interface(s, true);
 269         }
 270 }
 271
 272 static void
 273 config_init_routes(void)
 274 {
 275         struct interface *iface;
 276         struct uci_element *e;
 277
 278         vlist_for_each_element(&interfaces, iface, node)
 279                 interface_ip_update_start(&iface->config_ip);
 280
 281         uci_foreach_element(&uci_network->sections, e) {
 282                 struct uci_section *s = uci_to_section(e);
 283
 284                 if (!strcmp(s->type, "route"))
 285                         config_parse_route(s, false);
 286                 else if (!strcmp(s->type, "route6"))
 287                         config_parse_route(s, true);
 288         }
 289
 290         vlist_for_each_element(&interfaces, iface, node)
 291                 interface_ip_update_complete(&iface->config_ip);
 292 }
 293
 294 static void
 295 config_init_rules(void)
 296 {
 297         struct uci_element *e;
 298
 299         iprule_update_start();
 300
 301         uci_foreach_element(&uci_network->sections, e) {
 302                 struct uci_section *s = uci_to_section(e);
 303
 304                 if (!strcmp(s->type, "rule"))
 305                         config_parse_rule(s, false);
 306                 else if (!strcmp(s->type, "rule6"))
 307                         config_parse_rule(s, true);
 308         }
 309
 310         iprule_update_complete();
 311 }
 312
 313 static void
 314 config_init_globals(void)
 315 {
 316         struct uci_section *globals = uci_lookup_section(
 317                         uci_ctx, uci_network, "globals");
 318         if (!globals)
 319                 return;
 320
 321         const char *ula_prefix = uci_lookup_option_string(
 322                         uci_ctx, globals, "ula_prefix");
 323         interface_ip_set_ula_prefix(ula_prefix);
 324 }
 325
 326 static void
 327 config_parse_wireless_device(struct uci_section *s)
 328 {
 329         struct wireless_driver *drv;
 330         const char *driver_name;
 331
 332         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 333         if (!driver_name)
 334                 return;
 335
 336         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 337         if (!drv)
 338                 return;
 339
 340         blob_buf_init(&b, 0);
 341         uci_to_blob(&b, s, drv->device.config);
 342         wireless_device_create(drv, s->e.name, b.head);
 343 }
 344
 345 static void
 346 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 347 {
 348         char *name;
 349
 350         name = alloca(strlen(s->type) + 16);
 351         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 352
 353         blob_buf_init(&b, 0);
 354         uci_to_blob(&b, s, wdev->drv->interface.config);
 355         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 356 }
 357
 358 static void
 359 config_init_wireless(void)
 360 {
 361         struct wireless_device *wdev;
 362         struct uci_element *e;
 363         const char *dev_name;
 364
 365         if (!uci_wireless) {
 366                 DPRINTF("No wireless configuration found\n");
 367                 return;
 368         }
 369
 370         vlist_update(&wireless_devices);
 371
 372         uci_foreach_element(&uci_wireless->sections, e) {
 373                 struct uci_section *s = uci_to_section(e);
 374                 if (strcmp(s->type, "wifi-device") != 0)
 375                         continue;
 376
 377                 config_parse_wireless_device(s);
 378         }
 379
 380         vlist_flush(&wireless_devices);
 381
 382         vlist_for_each_element(&wireless_devices, wdev, node) {
 383                 wdev->vif_idx = 0;
 384                 vlist_update(&wdev->interfaces);
 385         }
 386
 387         uci_foreach_element(&uci_wireless->sections, e) {
 388                 struct uci_section *s = uci_to_section(e);
 389
 390                 if (strcmp(s->type, "wifi-iface") != 0)
 391                         continue;
 392
 393                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 394                 if (!dev_name)
 395                         continue;
 396
 397                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 398                 if (!wdev) {
 399                         DPRINTF("device %s not found!\n", dev_name);
 400                         continue;
 401                 }
 402
 403                 config_parse_wireless_interface(wdev, s);
 404         }
 405
 406         vlist_for_each_element(&wireless_devices, wdev, node)
 407                 vlist_flush(&wdev->interfaces);
 408 }
 409
 410 void
 411 config_init_all(void)
 412 {
 413         uci_network = config_init_package("network");
 414         if (!uci_network) {
 415                 fprintf(stderr, "Failed to load network config\n");
 416                 return;
 417         }
 418
 419         uci_wireless = config_init_package("wireless");
 420
 421         vlist_update(&interfaces);
 422         config_init = true;
 423         device_lock();
 424
 425         device_reset_config();
 426         config_init_devices();
 427         config_init_interfaces();
 428         config_init_routes();
 429         config_init_rules();
 430         config_init_globals();
 431         config_init_wireless();
 432
 433         config_init = false;
 434         device_unlock();
 435
 436         device_reset_old();
 437         device_init_pending();
 438         vlist_flush(&interfaces);
 439         device_free_unused(NULL);
 440         interface_refresh_assignments(false);
 441         interface_start_pending();
 442         wireless_start_pending();
 443 }