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 #include <string.h>
  15 #include <stdlib.h>
  16 #include <stdio.h>
  17
  18 #include <uci.h>
  19
  20 #include "netifd.h"
  21 #include "interface.h"
  22 #include "interface-ip.h"
  23 #include "iprule.h"
  24 #include "proto.h"
  25 #include "config.h"
  26
  27 bool config_init = false;
  28
  29 static struct uci_context *uci_ctx;
  30 static struct uci_package *uci_network;
  31 static struct blob_buf b;
  32
  33 static int
  34 config_parse_bridge_interface(struct uci_section *s)
  35 {
  36         char *name;
  37
  38         name = alloca(strlen(s->e.name) + 4);
  39         sprintf(name, "br-%s", s->e.name);
  40         blobmsg_add_string(&b, "name", name);
  41
  42         uci_to_blob(&b, s, bridge_device_type.config_params);
  43         if (!device_create(name, &bridge_device_type, b.head)) {
  44                 D(INTERFACE, "Failed to create bridge for interface '%s'\n", s->e.name);
  45                 return -EINVAL;
  46         }
  47
  48         blob_buf_init(&b, 0);
  49         blobmsg_add_string(&b, "ifname", name);
  50         return 0;
  51 }
  52
  53 static void
  54 config_parse_interface(struct uci_section *s, bool alias)
  55 {
  56         struct interface *iface;
  57         const char *type = NULL;
  58         struct blob_attr *config;
  59         struct device *dev;
  60         bool bridge = false;
  61
  62         blob_buf_init(&b, 0);
  63
  64         if (!alias)
  65                 type = uci_lookup_option_string(uci_ctx, s, "type");
  66         if (type && !strcmp(type, "bridge")) {
  67                 if (config_parse_bridge_interface(s))
  68                         return;
  69
  70                 bridge = true;
  71         }
  72
  73         uci_to_blob(&b, s, &interface_attr_list);
  74         iface = calloc(1, sizeof(*iface));
  75         if (!iface)
  76                 return;
  77
  78         interface_init(iface, s->e.name, b.head);
  79
  80         if (iface->proto_handler && iface->proto_handler->config_params)
  81                 uci_to_blob(&b, s, iface->proto_handler->config_params);
  82
  83         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
  84                 iface->device_config = true;
  85
  86         config = blob_memdup(b.head);
  87         if (!config)
  88                 goto error;
  89
  90         if (alias) {
  91                 if (!interface_add_alias(iface, config))
  92                         goto error_free_config;
  93         } else {
  94                 interface_add(iface, config);
  95         }
  96
  97         /*
  98          * need to look up the interface name again, in case of config update,
  99          * the pointer will have changed
 100          */
 101         iface = vlist_find(&interfaces, s->e.name, iface, node);
 102         if (!iface)
 103                 return;
 104
 105         dev = iface->main_dev.dev;
 106         if (!dev || !dev->default_config)
 107                 return;
 108
 109         blob_buf_init(&b, 0);
 110         uci_to_blob(&b, s, dev->type->config_params);
 111         if (blob_len(b.head) == 0)
 112                 return;
 113
 114         device_set_config(dev, dev->type, b.head);
 115         return;
 116 error_free_config:
 117         free(config);
 118 error:
 119         free(iface);
 120 }
 121
 122 static void
 123 config_parse_route(struct uci_section *s, bool v6)
 124 {
 125         void *route;
 126
 127         blob_buf_init(&b, 0);
 128         route = blobmsg_open_array(&b, "route");
 129         uci_to_blob(&b, s, &route_attr_list);
 130         blobmsg_close_array(&b, route);
 131         interface_ip_add_route(NULL, blob_data(b.head), v6);
 132 }
 133
 134 static void
 135 config_parse_rule(struct uci_section *s, bool v6)
 136 {
 137         void *rule;
 138
 139         blob_buf_init(&b, 0);
 140         rule = blobmsg_open_array(&b, "rule");
 141         uci_to_blob(&b, s, &rule_attr_list);
 142         blobmsg_close_array(&b, rule);
 143         iprule_add(blob_data(b.head), v6);
 144 }
 145
 146 static void
 147 config_init_devices(void)
 148 {
 149         struct uci_element *e;
 150
 151         uci_foreach_element(&uci_network->sections, e) {
 152                 struct uci_section *s = uci_to_section(e);
 153                 const struct device_type *devtype = NULL;
 154                 const char *type, *name;
 155
 156                 if (strcmp(s->type, "device") != 0)
 157                         continue;
 158
 159                 name = uci_lookup_option_string(uci_ctx, s, "name");
 160                 if (!name)
 161                         continue;
 162
 163                 type = uci_lookup_option_string(uci_ctx, s, "type");
 164                 if (type) {
 165                         if (!strcmp(type, "bridge"))
 166                                 devtype = &bridge_device_type;
 167                         else if (!strcmp(type, "tunnel"))
 168                                 devtype = &tunnel_device_type;
 169                 }
 170
 171                 if (!devtype)
 172                         devtype = &simple_device_type;
 173
 174                 blob_buf_init(&b, 0);
 175                 uci_to_blob(&b, s, devtype->config_params);
 176                 device_create(name, devtype, b.head);
 177         }
 178 }
 179
 180 static struct uci_package *
 181 config_init_package(const char *config)
 182 {
 183         struct uci_context *ctx = uci_ctx;
 184         struct uci_package *p = NULL;
 185
 186         if (!ctx) {
 187                 ctx = uci_alloc_context();
 188                 uci_ctx = ctx;
 189
 190 #ifdef DUMMY_MODE
 191                 uci_set_confdir(ctx, "./config");
 192                 uci_set_savedir(ctx, "./tmp");
 193 #endif
 194         } else {
 195                 p = uci_lookup_package(ctx, config);
 196                 if (p)
 197                         uci_unload(ctx, p);
 198         }
 199
 200         if (uci_load(ctx, config, &p))
 201                 return NULL;
 202
 203         return p;
 204 }
 205
 206 static void
 207 config_init_interfaces(void)
 208 {
 209         struct uci_element *e;
 210
 211         uci_foreach_element(&uci_network->sections, e) {
 212                 struct uci_section *s = uci_to_section(e);
 213
 214                 if (!strcmp(s->type, "interface"))
 215                         config_parse_interface(s, false);
 216         }
 217
 218         uci_foreach_element(&uci_network->sections, e) {
 219                 struct uci_section *s = uci_to_section(e);
 220
 221                 if (!strcmp(s->type, "alias"))
 222                         config_parse_interface(s, true);
 223         }
 224 }
 225
 226 static void
 227 config_init_routes(void)
 228 {
 229         struct interface *iface;
 230         struct uci_element *e;
 231
 232         vlist_for_each_element(&interfaces, iface, node)
 233                 interface_ip_update_start(&iface->config_ip);
 234
 235         uci_foreach_element(&uci_network->sections, e) {
 236                 struct uci_section *s = uci_to_section(e);
 237
 238                 if (!strcmp(s->type, "route"))
 239                         config_parse_route(s, false);
 240                 else if (!strcmp(s->type, "route6"))
 241                         config_parse_route(s, true);
 242         }
 243
 244         vlist_for_each_element(&interfaces, iface, node)
 245                 interface_ip_update_complete(&iface->config_ip);
 246 }
 247
 248 static void
 249 config_init_rules(void)
 250 {
 251         struct uci_element *e;
 252
 253         iprule_update_start();
 254
 255         uci_foreach_element(&uci_network->sections, e) {
 256                 struct uci_section *s = uci_to_section(e);
 257
 258                 if (!strcmp(s->type, "rule"))
 259                         config_parse_rule(s, false);
 260                 else if (!strcmp(s->type, "rule6"))
 261                         config_parse_rule(s, true);
 262         }
 263
 264         iprule_update_complete();
 265 }
 266
 267 static void
 268 config_init_globals(void)
 269 {
 270         struct uci_section *globals = uci_lookup_section(
 271                         uci_ctx, uci_network, "globals");
 272         if (!globals)
 273                 return;
 274
 275         const char *ula_prefix = uci_lookup_option_string(
 276                         uci_ctx, globals, "ula_prefix");
 277         interface_ip_set_ula_prefix(ula_prefix);
 278 }
 279
 280 void
 281 config_init_all(void)
 282 {
 283         uci_network = config_init_package("network");
 284         if (!uci_network) {
 285                 fprintf(stderr, "Failed to load network config\n");
 286                 return;
 287         }
 288
 289         vlist_update(&interfaces);
 290         config_init = true;
 291         device_lock();
 292
 293         device_reset_config();
 294         config_init_devices();
 295         config_init_interfaces();
 296         config_init_routes();
 297         config_init_rules();
 298         config_init_globals();
 299
 300         config_init = false;
 301         device_unlock();
 302
 303         device_reset_old();
 304         device_init_pending();
 305         vlist_flush(&interfaces);
 306         device_free_unused(NULL);
 307         interface_refresh_assignments(false);
 308         interface_start_pending();
 309 }