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
  75         iface = interface_alloc(s->e.name, b.head);
  76         if (!iface)
  77                 return;
  78
  79         if (iface->proto_handler && iface->proto_handler->config_params)
  80                 uci_to_blob(&b, s, iface->proto_handler->config_params);
  81
  82         if (!bridge && uci_to_blob(&b, s, simple_device_type.config_params))
  83                 iface->device_config = true;
  84
  85         config = blob_memdup(b.head);
  86         if (!config)
  87                 goto error;
  88
  89         if (alias) {
  90                 if (!interface_add_alias(iface, config))
  91                         goto error_free_config;
  92         } else {
  93                 interface_add(iface, config);
  94         }
  95
  96         /*
  97          * need to look up the interface name again, in case of config update,
  98          * the pointer will have changed
  99          */
 100         iface = vlist_find(&interfaces, s->e.name, iface, node);
 101         if (!iface)
 102                 return;
 103
 104         dev = iface->main_dev.dev;
 105         if (!dev || !dev->default_config)
 106                 return;
 107
 108         blob_buf_init(&b, 0);
 109         uci_to_blob(&b, s, dev->type->config_params);
 110         if (blob_len(b.head) == 0)
 111                 return;
 112
 113         device_set_config(dev, dev->type, b.head);
 114         return;
 115 error_free_config:
 116         free(config);
 117 error:
 118         free(iface);
 119 }
 120
 121 static void
 122 config_parse_route(struct uci_section *s, bool v6)
 123 {
 124         void *route;
 125
 126         blob_buf_init(&b, 0);
 127         route = blobmsg_open_array(&b, "route");
 128         uci_to_blob(&b, s, &route_attr_list);
 129         blobmsg_close_array(&b, route);
 130         interface_ip_add_route(NULL, blob_data(b.head), v6);
 131 }
 132
 133 static void
 134 config_parse_rule(struct uci_section *s, bool v6)
 135 {
 136         void *rule;
 137
 138         blob_buf_init(&b, 0);
 139         rule = blobmsg_open_array(&b, "rule");
 140         uci_to_blob(&b, s, &rule_attr_list);
 141         blobmsg_close_array(&b, rule);
 142         iprule_add(blob_data(b.head), v6);
 143 }
 144
 145 static void
 146 config_init_devices(void)
 147 {
 148         struct uci_element *e;
 149
 150         uci_foreach_element(&uci_network->sections, e) {
 151                 struct uci_section *s = uci_to_section(e);
 152                 const struct device_type *devtype = NULL;
 153                 const char *type, *name;
 154
 155                 if (strcmp(s->type, "device") != 0)
 156                         continue;
 157
 158                 name = uci_lookup_option_string(uci_ctx, s, "name");
 159                 if (!name)
 160                         continue;
 161
 162                 type = uci_lookup_option_string(uci_ctx, s, "type");
 163                 if (type) {
 164                         if (!strcmp(type, "bridge"))
 165                                 devtype = &bridge_device_type;
 166                         else if (!strcmp(type, "tunnel"))
 167                                 devtype = &tunnel_device_type;
 168                         else if (!strcmp(type, "macvlan"))
 169                                 devtype = &macvlan_device_type;
 170                 }
 171
 172                 if (!devtype)
 173                         devtype = &simple_device_type;
 174
 175                 blob_buf_init(&b, 0);
 176                 uci_to_blob(&b, s, devtype->config_params);
 177                 device_create(name, devtype, b.head);
 178         }
 179 }
 180
 181 static struct uci_package *
 182 config_init_package(const char *config)
 183 {
 184         struct uci_context *ctx = uci_ctx;
 185         struct uci_package *p = NULL;
 186
 187         if (!ctx) {
 188                 ctx = uci_alloc_context();
 189                 uci_ctx = ctx;
 190
 191 #ifdef DUMMY_MODE
 192                 uci_set_confdir(ctx, "./config");
 193                 uci_set_savedir(ctx, "./tmp");
 194 #endif
 195         } else {
 196                 p = uci_lookup_package(ctx, config);
 197                 if (p)
 198                         uci_unload(ctx, p);
 199         }
 200
 201         if (uci_load(ctx, config, &p))
 202                 return NULL;
 203
 204         return p;
 205 }
 206
 207 static void
 208 config_init_interfaces(void)
 209 {
 210         struct uci_element *e;
 211
 212         uci_foreach_element(&uci_network->sections, e) {
 213                 struct uci_section *s = uci_to_section(e);
 214
 215                 if (!strcmp(s->type, "interface"))
 216                         config_parse_interface(s, false);
 217         }
 218
 219         uci_foreach_element(&uci_network->sections, e) {
 220                 struct uci_section *s = uci_to_section(e);
 221
 222                 if (!strcmp(s->type, "alias"))
 223                         config_parse_interface(s, true);
 224         }
 225 }
 226
 227 static void
 228 config_init_routes(void)
 229 {
 230         struct interface *iface;
 231         struct uci_element *e;
 232
 233         vlist_for_each_element(&interfaces, iface, node)
 234                 interface_ip_update_start(&iface->config_ip);
 235
 236         uci_foreach_element(&uci_network->sections, e) {
 237                 struct uci_section *s = uci_to_section(e);
 238
 239                 if (!strcmp(s->type, "route"))
 240                         config_parse_route(s, false);
 241                 else if (!strcmp(s->type, "route6"))
 242                         config_parse_route(s, true);
 243         }
 244
 245         vlist_for_each_element(&interfaces, iface, node)
 246                 interface_ip_update_complete(&iface->config_ip);
 247 }
 248
 249 static void
 250 config_init_rules(void)
 251 {
 252         struct uci_element *e;
 253
 254         iprule_update_start();
 255
 256         uci_foreach_element(&uci_network->sections, e) {
 257                 struct uci_section *s = uci_to_section(e);
 258
 259                 if (!strcmp(s->type, "rule"))
 260                         config_parse_rule(s, false);
 261                 else if (!strcmp(s->type, "rule6"))
 262                         config_parse_rule(s, true);
 263         }
 264
 265         iprule_update_complete();
 266 }
 267
 268 static void
 269 config_init_globals(void)
 270 {
 271         struct uci_section *globals = uci_lookup_section(
 272                         uci_ctx, uci_network, "globals");
 273         if (!globals)
 274                 return;
 275
 276         const char *ula_prefix = uci_lookup_option_string(
 277                         uci_ctx, globals, "ula_prefix");
 278         interface_ip_set_ula_prefix(ula_prefix);
 279 }
 280
 281 void
 282 config_init_all(void)
 283 {
 284         uci_network = config_init_package("network");
 285         if (!uci_network) {
 286                 fprintf(stderr, "Failed to load network config\n");
 287                 return;
 288         }
 289
 290         vlist_update(&interfaces);
 291         config_init = true;
 292         device_lock();
 293
 294         device_reset_config();
 295         config_init_devices();
 296         config_init_interfaces();
 297         config_init_routes();
 298         config_init_rules();
 299         config_init_globals();
 300
 301         config_init = false;
 302         device_unlock();
 303
 304         device_reset_old();
 305         device_init_pending();
 306         vlist_flush(&interfaces);
 307         device_free_unused(NULL);
 308         interface_refresh_assignments(false);
 309         interface_start_pending();
 310 }