interface-ip.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5
   6 #include <arpa/inet.h>
   7
   8 #include "netifd.h"
   9 #include "device.h"
  10 #include "interface.h"
  11 #include "interface-ip.h"
  12 #include "proto.h"
  13 #include "ubus.h"
  14 #include "system.h"
  15
  16 enum {
  17         ROUTE_INTERFACE,
  18         ROUTE_TARGET,
  19         ROUTE_MASK,
  20         ROUTE_GATEWAY,
  21         ROUTE_DEVICE,
  22         ROUTE_METRIC,
  23         ROUTE_MTU,
  24         __ROUTE_MAX
  25 };
  26
  27 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  28         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  29         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  30         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  31         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  32         [ROUTE_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
  33         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  34         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  35 };
  36
  37 const struct config_param_list route_attr_list = {
  38         .n_params = __ROUTE_MAX,
  39         .params = route_attr,
  40 };
  41
  42 void
  43 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
  44 {
  45         struct interface_ip_settings *ip;
  46         struct blob_attr *tb[__ROUTE_MAX], *cur;
  47         struct device_route *route;
  48         int af = v6 ? AF_INET6 : AF_INET;
  49         bool config = false;
  50
  51         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
  52
  53         if (!tb[ROUTE_GATEWAY] && !tb[ROUTE_DEVICE])
  54                 return;
  55
  56         if (!iface) {
  57                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
  58                         return;
  59
  60                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
  61                 if (!iface)
  62                         return;
  63
  64                 ip = &iface->config_ip;
  65                 config = true;
  66         } else {
  67                 ip = &iface->proto_ip;
  68         }
  69
  70         route = calloc(1, sizeof(*route));
  71         if (!route)
  72                 return;
  73
  74         route->mask = v6 ? 128 : 32;
  75         if ((cur = tb[ROUTE_MASK]) != NULL) {
  76                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
  77                 if (route->mask > (v6 ? 128 : 32))
  78                         goto error;
  79         }
  80
  81         if ((cur = tb[ROUTE_TARGET]) != NULL) {
  82                 if (!inet_pton(af, blobmsg_data(cur), &route->addr)) {
  83                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
  84                         goto error;
  85                 }
  86         }
  87
  88         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
  89                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
  90                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
  91                         goto error;
  92                 }
  93         }
  94
  95         if ((cur = tb[ROUTE_METRIC]) != NULL)
  96                 route->metric = blobmsg_get_u32(cur);
  97
  98         if ((cur = tb[ROUTE_MTU]) != NULL)
  99                 route->mtu = blobmsg_get_u32(cur);
 100
 101         if (!config && (cur = tb[ROUTE_DEVICE]) != NULL)
 102                 route->device = device_get(blobmsg_data(cur), true);
 103
 104         vlist_add(&ip->route, &route->node);
 105         return;
 106
 107 error:
 108         free(route);
 109 }
 110
 111 static int
 112 addr_cmp(const void *k1, const void *k2, void *ptr)
 113 {
 114         return memcmp(k1, k2, sizeof(struct device_addr) -
 115                       offsetof(struct device_addr, mask));
 116 }
 117
 118 static int
 119 route_cmp(const void *k1, const void *k2, void *ptr)
 120 {
 121         return memcmp(k1, k2, sizeof(struct device_route) -
 122                       offsetof(struct device_route, mask));
 123 }
 124
 125 static void
 126 interface_update_proto_addr(struct vlist_tree *tree,
 127                             struct vlist_node *node_new,
 128                             struct vlist_node *node_old)
 129 {
 130         struct interface_ip_settings *ip;
 131         struct interface *iface;
 132         struct device *dev;
 133         struct device_addr *addr;
 134         bool keep = false;
 135
 136         ip = container_of(tree, struct interface_ip_settings, addr);
 137         iface = ip->iface;
 138         dev = iface->l3_dev->dev;
 139
 140         if (node_old && node_new)
 141                 keep = true;
 142
 143         if (node_old) {
 144                 addr = container_of(node_old, struct device_addr, node);
 145                 if (!(addr->flags & DEVADDR_EXTERNAL) && addr->enabled && !keep)
 146                         system_del_address(dev, addr);
 147                 free(addr);
 148         }
 149
 150         if (node_new) {
 151                 addr = container_of(node_new, struct device_addr, node);
 152                 if (!(addr->flags & DEVADDR_EXTERNAL) && !keep)
 153                         system_add_address(dev, addr);
 154                 addr->enabled = true;
 155         }
 156 }
 157
 158 static bool
 159 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 160 {
 161         if (ip->no_defaultroute && !route->mask)
 162                 return false;
 163
 164         return true;
 165 }
 166
 167 static void
 168 interface_update_proto_route(struct vlist_tree *tree,
 169                              struct vlist_node *node_new,
 170                              struct vlist_node *node_old)
 171 {
 172         struct interface_ip_settings *ip;
 173         struct interface *iface;
 174         struct device *dev;
 175         struct device_route *route_old, *route_new;
 176         bool keep = false;
 177
 178         ip = container_of(tree, struct interface_ip_settings, route);
 179         iface = ip->iface;
 180         dev = iface->l3_dev->dev;
 181
 182         route_old = container_of(node_old, struct device_route, node);
 183         route_new = container_of(node_new, struct device_route, node);
 184
 185         if (node_old && node_new)
 186                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 187
 188         if (node_old) {
 189                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 190                         system_del_route(dev, route_old);
 191                 free(route_old);
 192         }
 193
 194         if (node_new) {
 195                 bool _enabled = enable_route(ip, route_new);
 196
 197                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 198                         system_add_route(dev, route_new);
 199
 200                 route_new->enabled = _enabled;
 201         }
 202 }
 203
 204 void
 205 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 206 {
 207         struct dns_server *s;
 208
 209         s = calloc(1, sizeof(*s));
 210         s->af = AF_INET;
 211         if (inet_pton(s->af, str, &s->addr.in))
 212                 goto add;
 213
 214         s->af = AF_INET6;
 215         if (inet_pton(s->af, str, &s->addr.in))
 216                 goto add;
 217
 218         free(s);
 219         return;
 220
 221 add:
 222         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 223           s->af == AF_INET6 ? '6' : '4', str);
 224         vlist_simple_add(&ip->dns_servers, &s->node);
 225 }
 226
 227 void
 228 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 229 {
 230         struct blob_attr *cur;
 231         int rem;
 232
 233         blobmsg_for_each_attr(cur, list, rem) {
 234                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 235                         continue;
 236
 237                 if (!blobmsg_check_attr(cur, NULL))
 238                         continue;
 239
 240                 interface_add_dns_server(ip, blobmsg_data(cur));
 241         }
 242 }
 243
 244 static void
 245 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 246 {
 247         struct dns_search_domain *s;
 248         int len = strlen(str);
 249
 250         s = calloc(1, sizeof(*s) + len + 1);
 251         if (!s)
 252                 return;
 253
 254         D(INTERFACE, "Add DNS search domain: %s\n", str);
 255         memcpy(s->name, str, len);
 256         vlist_simple_add(&ip->dns_search, &s->node);
 257 }
 258
 259 void
 260 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 261 {
 262         struct blob_attr *cur;
 263         int rem;
 264
 265         blobmsg_for_each_attr(cur, list, rem) {
 266                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 267                         continue;
 268
 269                 if (!blobmsg_check_attr(cur, NULL))
 270                         continue;
 271
 272                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 273         }
 274 }
 275
 276 static void
 277 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 278 {
 279         struct dns_server *s;
 280         struct dns_search_domain *d;
 281         const char *str;
 282         char buf[32];
 283
 284         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 285                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 286                 if (!str)
 287                         continue;
 288
 289                 fprintf(f, "nameserver %s\n", str);
 290         }
 291
 292         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 293                 fprintf(f, "search %s\n", d->name);
 294         }
 295 }
 296
 297 void
 298 interface_write_resolv_conf(void)
 299 {
 300         struct interface *iface;
 301         char *path = alloca(strlen(resolv_conf) + 5);
 302         FILE *f;
 303
 304         sprintf(path, "%s.tmp", resolv_conf);
 305         unlink(path);
 306         f = fopen(path, "w");
 307         if (!f) {
 308                 D(INTERFACE, "Failed to open %s for writing\n", path);
 309                 return;
 310         }
 311
 312         vlist_for_each_element(&interfaces, iface, node) {
 313                 if (iface->state != IFS_UP)
 314                         continue;
 315
 316                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 317                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 318                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 319                     vlist_simple_empty(&iface->config_ip.dns_servers))
 320                         continue;
 321
 322                 fprintf(f, "# Interface %s\n", iface->name);
 323                 write_resolv_conf_entries(f, &iface->config_ip);
 324                 write_resolv_conf_entries(f, &iface->proto_ip);
 325         }
 326         fclose(f);
 327         if (rename(path, resolv_conf) < 0) {
 328                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 329                 unlink(path);
 330         }
 331 }
 332
 333 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 334 {
 335         struct device_addr *addr;
 336         struct device_route *route;
 337         struct device *dev;
 338
 339         ip->enabled = enabled;
 340         dev = ip->iface->l3_dev->dev;
 341         if (!dev)
 342                 return;
 343
 344         vlist_for_each_element(&ip->addr, addr, node) {
 345                 if (addr->enabled == enabled)
 346                         continue;
 347
 348                 if (enabled)
 349                         system_add_address(dev, addr);
 350                 else
 351                         system_del_address(dev, addr);
 352                 addr->enabled = enabled;
 353         }
 354
 355         vlist_for_each_element(&ip->route, route, node) {
 356                 bool _enabled = enabled;
 357
 358                 if (!enable_route(ip, route))
 359                         _enabled = false;
 360
 361                 if (route->enabled == _enabled)
 362                         continue;
 363
 364                 if (_enabled)
 365                         system_add_route(dev, route);
 366                 else
 367                         system_del_route(dev, route);
 368                 route->enabled = _enabled;
 369         }
 370 }
 371
 372 void
 373 interface_ip_update_start(struct interface_ip_settings *ip)
 374 {
 375         vlist_simple_update(&ip->dns_servers);
 376         vlist_simple_update(&ip->dns_search);
 377         vlist_update(&ip->route);
 378         vlist_update(&ip->addr);
 379 }
 380
 381 void
 382 interface_ip_update_complete(struct interface_ip_settings *ip)
 383 {
 384         vlist_simple_flush(&ip->dns_servers);
 385         vlist_simple_flush(&ip->dns_search);
 386         vlist_flush(&ip->route);
 387         vlist_flush(&ip->addr);
 388 }
 389
 390 void
 391 interface_ip_flush(struct interface_ip_settings *ip)
 392 {
 393         vlist_simple_flush_all(&ip->dns_servers);
 394         vlist_simple_flush_all(&ip->dns_search);
 395         vlist_flush_all(&ip->route);
 396         vlist_flush_all(&ip->addr);
 397 }
 398
 399 void
 400 interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 401 {
 402         ip->iface = iface;
 403         ip->enabled = true;
 404         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 405         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 406         vlist_init(&ip->route, route_cmp, interface_update_proto_route,
 407                    struct device_route, node, mask);
 408         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr,
 409                    struct device_addr, node, mask);
 410 }