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         bool bridge = false;
  82
  83         disabled = uci_lookup_option_string(uci_ctx, s, "disabled");
  84         if (disabled && !strcmp(disabled, "1"))
  85                 return;
  86
  87         blob_buf_init(&b, 0);
  88
  89         if (!alias)
  90                 type = uci_lookup_option_string(uci_ctx, s, "type");
  91         if (type && !strcmp(type, "bridge")) {
  92                 if (config_parse_bridge_interface(s))
  93                         return;
  94
  95                 bridge = true;
  96         }
  97
  98         uci_to_blob(&b, s, &interface_attr_list);
  99
 100         iface = interface_alloc(s->e.name, b.head);
 101         if (!iface)
 102                 return;
 103
 104         if (iface->proto_handler && iface->proto_handler->config_params)
 105                 uci_to_blob(&b, s, iface->proto_handler->config_params);
 106
 107         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
 108                 iface->device_config = true;
 109
 110         config = blob_memdup(b.head);
 111         if (!config)
 112                 goto error;
 113
 114         if (alias) {
 115                 if (!interface_add_alias(iface, config))
 116                         goto error_free_config;
 117         } else {
 118                 interface_add(iface, config);
 119         }
 120         return;
 121
 122 error_free_config:
 123         free(config);
 124 error:
 125         free(iface);
 126 }
 127
 128 static void
 129 config_parse_route(struct uci_section *s, bool v6)
 130 {
 131         void *route;
 132
 133         blob_buf_init(&b, 0);
 134         route = blobmsg_open_array(&b, "route");
 135         uci_to_blob(&b, s, &route_attr_list);
 136         blobmsg_close_array(&b, route);
 137         interface_ip_add_route(NULL, blob_data(b.head), v6);
 138 }
 139
 140 static void
 141 config_parse_rule(struct uci_section *s, bool v6)
 142 {
 143         void *rule;
 144
 145         blob_buf_init(&b, 0);
 146         rule = blobmsg_open_array(&b, "rule");
 147         uci_to_blob(&b, s, &rule_attr_list);
 148         blobmsg_close_array(&b, rule);
 149         iprule_add(blob_data(b.head), v6);
 150 }
 151
 152 static void
 153 config_init_devices(void)
 154 {
 155         struct uci_element *e;
 156
 157         uci_foreach_element(&uci_network->sections, e) {
 158                 const struct uci_blob_param_list *params = NULL;
 159                 struct uci_section *s = uci_to_section(e);
 160                 const struct device_type *devtype = NULL;
 161                 struct device *dev;
 162                 const char *type, *name;
 163
 164                 if (strcmp(s->type, "device") != 0)
 165                         continue;
 166
 167                 name = uci_lookup_option_string(uci_ctx, s, "name");
 168                 if (!name)
 169                         continue;
 170
 171                 type = uci_lookup_option_string(uci_ctx, s, "type");
 172                 if (type) {
 173                         if (!strcmp(type, "8021ad"))
 174                                 devtype = &vlandev_device_type;
 175                         else if (!strcmp(type, "8021q"))
 176                                 devtype = &vlandev_device_type;
 177                         else if (!strcmp(type, "bridge"))
 178                                 devtype = &bridge_device_type;
 179                         else if (!strcmp(type, "macvlan"))
 180                                 devtype = &macvlan_device_type;
 181                         else if (!strcmp(type, "tunnel"))
 182                                 devtype = &tunnel_device_type;
 183                 }
 184
 185                 if (devtype)
 186                         params = devtype->config_params;
 187                 if (!params)
 188                         params = simple_device_type.config_params;
 189
 190                 blob_buf_init(&b, 0);
 191                 uci_to_blob(&b, s, params);
 192                 if (devtype) {
 193                         dev = device_create(name, devtype, b.head);
 194                         if (!dev)
 195                                 continue;
 196                 } else {
 197                         dev = device_get(name, 1);
 198                         if (!dev)
 199                                 continue;
 200
 201                         dev->current_config = true;
 202                         device_apply_config(dev, dev->type, b.head);
 203                 }
 204                 dev->default_config = false;
 205         }
 206 }
 207
 208 static struct uci_package *
 209 config_init_package(const char *config)
 210 {
 211         struct uci_context *ctx = uci_ctx;
 212         struct uci_package *p = NULL;
 213
 214         if (!ctx) {
 215                 ctx = uci_alloc_context();
 216                 uci_ctx = ctx;
 217
 218                 ctx->flags &= ~UCI_FLAG_STRICT;
 219                 if (config_path)
 220                         uci_set_confdir(ctx, config_path);
 221
 222 #ifdef DUMMY_MODE
 223                 uci_set_savedir(ctx, "./tmp");
 224 #endif
 225         } else {
 226                 p = uci_lookup_package(ctx, config);
 227                 if (p)
 228                         uci_unload(ctx, p);
 229         }
 230
 231         if (uci_load(ctx, config, &p))
 232                 return NULL;
 233
 234         return p;
 235 }
 236
 237 static void
 238 config_init_interfaces(void)
 239 {
 240         struct uci_element *e;
 241
 242         uci_foreach_element(&uci_network->sections, e) {
 243                 struct uci_section *s = uci_to_section(e);
 244
 245                 if (!strcmp(s->type, "interface"))
 246                         config_parse_interface(s, false);
 247         }
 248
 249         uci_foreach_element(&uci_network->sections, e) {
 250                 struct uci_section *s = uci_to_section(e);
 251
 252                 if (!strcmp(s->type, "alias"))
 253                         config_parse_interface(s, true);
 254         }
 255 }
 256
 257 static void
 258 config_init_routes(void)
 259 {
 260         struct interface *iface;
 261         struct uci_element *e;
 262
 263         vlist_for_each_element(&interfaces, iface, node)
 264                 interface_ip_update_start(&iface->config_ip);
 265
 266         uci_foreach_element(&uci_network->sections, e) {
 267                 struct uci_section *s = uci_to_section(e);
 268
 269                 if (!strcmp(s->type, "route"))
 270                         config_parse_route(s, false);
 271                 else if (!strcmp(s->type, "route6"))
 272                         config_parse_route(s, true);
 273         }
 274
 275         vlist_for_each_element(&interfaces, iface, node)
 276                 interface_ip_update_complete(&iface->config_ip);
 277 }
 278
 279 static void
 280 config_init_rules(void)
 281 {
 282         struct uci_element *e;
 283
 284         iprule_update_start();
 285
 286         uci_foreach_element(&uci_network->sections, e) {
 287                 struct uci_section *s = uci_to_section(e);
 288
 289                 if (!strcmp(s->type, "rule"))
 290                         config_parse_rule(s, false);
 291                 else if (!strcmp(s->type, "rule6"))
 292                         config_parse_rule(s, true);
 293         }
 294
 295         iprule_update_complete();
 296 }
 297
 298 static void
 299 config_init_globals(void)
 300 {
 301         struct uci_section *globals = uci_lookup_section(
 302                         uci_ctx, uci_network, "globals");
 303         if (!globals)
 304                 return;
 305
 306         const char *ula_prefix = uci_lookup_option_string(
 307                         uci_ctx, globals, "ula_prefix");
 308         interface_ip_set_ula_prefix(ula_prefix);
 309 }
 310
 311 static void
 312 config_parse_wireless_device(struct uci_section *s)
 313 {
 314         struct wireless_driver *drv;
 315         const char *driver_name;
 316
 317         driver_name = uci_lookup_option_string(uci_ctx, s, "type");
 318         if (!driver_name)
 319                 return;
 320
 321         drv = avl_find_element(&wireless_drivers, driver_name, drv, node);
 322         if (!drv)
 323                 return;
 324
 325         blob_buf_init(&b, 0);
 326         uci_to_blob(&b, s, drv->device.config);
 327         wireless_device_create(drv, s->e.name, b.head);
 328 }
 329
 330 static void
 331 config_parse_wireless_interface(struct wireless_device *wdev, struct uci_section *s)
 332 {
 333         char *name;
 334
 335         name = alloca(strlen(s->type) + 16);
 336         sprintf(name, "@%s[%d]", s->type, config_section_idx(s));
 337
 338         blob_buf_init(&b, 0);
 339         uci_to_blob(&b, s, wdev->drv->interface.config);
 340         wireless_interface_create(wdev, b.head, s->anonymous ? name : s->e.name);
 341 }
 342
 343 static void
 344 config_init_wireless(void)
 345 {
 346         struct wireless_device *wdev;
 347         struct uci_element *e;
 348         const char *dev_name;
 349
 350         if (!uci_wireless) {
 351                 DPRINTF("No wireless configuration found\n");
 352                 return;
 353         }
 354
 355         vlist_update(&wireless_devices);
 356
 357         uci_foreach_element(&uci_wireless->sections, e) {
 358                 struct uci_section *s = uci_to_section(e);
 359                 if (strcmp(s->type, "wifi-device") != 0)
 360                         continue;
 361
 362                 config_parse_wireless_device(s);
 363         }
 364
 365         vlist_flush(&wireless_devices);
 366
 367         vlist_for_each_element(&wireless_devices, wdev, node) {
 368                 wdev->vif_idx = 0;
 369                 vlist_update(&wdev->interfaces);
 370         }
 371
 372         uci_foreach_element(&uci_wireless->sections, e) {
 373                 struct uci_section *s = uci_to_section(e);
 374
 375                 if (strcmp(s->type, "wifi-iface") != 0)
 376                         continue;
 377
 378                 dev_name = uci_lookup_option_string(uci_ctx, s, "device");
 379                 if (!dev_name)
 380                         continue;
 381
 382                 wdev = vlist_find(&wireless_devices, dev_name, wdev, node);
 383                 if (!wdev) {
 384                         DPRINTF("device %s not found!\n", dev_name);
 385                         continue;
 386                 }
 387
 388                 config_parse_wireless_interface(wdev, s);
 389         }
 390
 391         vlist_for_each_element(&wireless_devices, wdev, node)
 392                 vlist_flush(&wdev->interfaces);
 393 }
 394
 395 void
 396 config_init_all(void)
 397 {
 398         uci_network = config_init_package("network");
 399         if (!uci_network) {
 400                 fprintf(stderr, "Failed to load network config\n");
 401                 return;
 402         }
 403
 404         uci_wireless = config_init_package("wireless");
 405
 406         vlist_update(&interfaces);
 407         config_init = true;
 408         device_lock();
 409
 410         device_reset_config();
 411         config_init_devices();
 412         config_init_interfaces();
 413         config_init_routes();
 414         config_init_rules();
 415         config_init_globals();
 416         config_init_wireless();
 417
 418         config_init = false;
 419         device_unlock();
 420
 421         device_reset_old();
 422         device_init_pending();
 423         vlist_flush(&interfaces);
 424         device_free_unused(NULL);
 425         interface_refresh_assignments(false);
 426         interface_start_pending();
 427         wireless_start_pending();
 428 }