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_METRIC,
  22         ROUTE_MTU,
  23         __ROUTE_MAX
  24 };
  25
  26 static const struct blobmsg_policy route_attr[__ROUTE_MAX] = {
  27         [ROUTE_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  28         [ROUTE_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
  29         [ROUTE_MASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  30         [ROUTE_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  31         [ROUTE_METRIC] = { .name = "metric", .type = BLOBMSG_TYPE_INT32 },
  32         [ROUTE_MTU] = { .name = "mtu", .type = BLOBMSG_TYPE_INT32 },
  33 };
  34
  35 const struct config_param_list route_attr_list = {
  36         .n_params = __ROUTE_MAX,
  37         .params = route_attr,
  38 };
  39
  40 void
  41 interface_ip_add_route(struct interface *iface, struct blob_attr *attr, bool v6)
  42 {
  43         struct interface_ip_settings *ip;
  44         struct blob_attr *tb[__ROUTE_MAX], *cur;
  45         struct device_route *route;
  46         int af = v6 ? AF_INET6 : AF_INET;
  47
  48         blobmsg_parse(route_attr, __ROUTE_MAX, tb, blobmsg_data(attr), blobmsg_data_len(attr));
  49
  50         if (!iface) {
  51                 if ((cur = tb[ROUTE_INTERFACE]) == NULL)
  52                         return;
  53
  54                 iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
  55                 if (!iface)
  56                         return;
  57
  58                 ip = &iface->config_ip;
  59         } else {
  60                 ip = &iface->proto_ip;
  61         }
  62
  63         route = calloc(1, sizeof(*route));
  64         if (!route)
  65                 return;
  66
  67         route->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
  68         route->mask = v6 ? 128 : 32;
  69         if ((cur = tb[ROUTE_MASK]) != NULL) {
  70                 route->mask = parse_netmask_string(blobmsg_data(cur), v6);
  71                 if (route->mask > (v6 ? 128 : 32))
  72                         goto error;
  73         }
  74
  75         if ((cur = tb[ROUTE_TARGET]) != NULL) {
  76                 if (!inet_pton(af, blobmsg_data(cur), &route->addr)) {
  77                         DPRINTF("Failed to parse route target: %s\n", (char *) blobmsg_data(cur));
  78                         goto error;
  79                 }
  80         }
  81
  82         if ((cur = tb[ROUTE_GATEWAY]) != NULL) {
  83                 if (!inet_pton(af, blobmsg_data(cur), &route->nexthop)) {
  84                         DPRINTF("Failed to parse route gateway: %s\n", (char *) blobmsg_data(cur));
  85                         goto error;
  86                 }
  87         }
  88
  89         if ((cur = tb[ROUTE_METRIC]) != NULL)
  90                 route->metric = blobmsg_get_u32(cur);
  91
  92         if ((cur = tb[ROUTE_MTU]) != NULL)
  93                 route->mtu = blobmsg_get_u32(cur);
  94
  95         vlist_add(&ip->route, &route->node, &route->mask);
  96         return;
  97
  98 error:
  99         free(route);
 100 }
 101
 102 static int
 103 addr_cmp(const void *k1, const void *k2, void *ptr)
 104 {
 105         return memcmp(k1, k2, sizeof(struct device_addr) -
 106                       offsetof(struct device_addr, mask));
 107 }
 108
 109 static int
 110 route_cmp(const void *k1, const void *k2, void *ptr)
 111 {
 112         return memcmp(k1, k2, sizeof(struct device_route) -
 113                       offsetof(struct device_route, mask));
 114 }
 115
 116 static void
 117 interface_update_proto_addr(struct vlist_tree *tree,
 118                             struct vlist_node *node_new,
 119                             struct vlist_node *node_old)
 120 {
 121         struct interface_ip_settings *ip;
 122         struct interface *iface;
 123         struct device *dev;
 124         struct device_addr *a_new = NULL, *a_old = NULL;
 125         bool keep = false;
 126
 127         ip = container_of(tree, struct interface_ip_settings, addr);
 128         iface = ip->iface;
 129         dev = iface->l3_dev->dev;
 130
 131         if (node_new) {
 132                 a_new = container_of(node_new, struct device_addr, node);
 133
 134                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 135                     !a_new->broadcast) {
 136
 137                         uint32_t mask = ~0;
 138                         uint32_t *a = (uint32_t *) &a_new->addr;
 139
 140                         mask >>= a_new->mask;
 141                         a_new->broadcast = *a | mask;
 142                 }
 143         }
 144
 145         if (node_old)
 146                 a_old = container_of(node_old, struct device_addr, node);
 147
 148         if (a_new && a_old) {
 149                 keep = true;
 150
 151                 if (a_old->flags != a_new->flags)
 152                         keep = false;
 153
 154                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 155                     a_new->broadcast != a_old->broadcast)
 156                         keep = false;
 157         }
 158
 159         if (node_old) {
 160                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep)
 161                         system_del_address(dev, a_old);
 162                 free(a_old);
 163         }
 164
 165         if (node_new) {
 166                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
 167                         system_add_address(dev, a_new);
 168                 a_new->enabled = true;
 169         }
 170 }
 171
 172 static bool
 173 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 174 {
 175         if (ip->no_defaultroute && !route->mask)
 176                 return false;
 177
 178         return true;
 179 }
 180
 181 static void
 182 interface_update_proto_route(struct vlist_tree *tree,
 183                              struct vlist_node *node_new,
 184                              struct vlist_node *node_old)
 185 {
 186         struct interface_ip_settings *ip;
 187         struct interface *iface;
 188         struct device *dev;
 189         struct device_route *route_old, *route_new;
 190         bool keep = false;
 191
 192         ip = container_of(tree, struct interface_ip_settings, route);
 193         iface = ip->iface;
 194         dev = iface->l3_dev->dev;
 195
 196         route_old = container_of(node_old, struct device_route, node);
 197         route_new = container_of(node_new, struct device_route, node);
 198
 199         if (node_old && node_new)
 200                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 201
 202         if (node_old) {
 203                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 204                         system_del_route(dev, route_old);
 205                 free(route_old);
 206         }
 207
 208         if (node_new) {
 209                 bool _enabled = enable_route(ip, route_new);
 210
 211                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 212                         system_add_route(dev, route_new);
 213
 214                 route_new->enabled = _enabled;
 215         }
 216 }
 217
 218 void
 219 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 220 {
 221         struct dns_server *s;
 222
 223         s = calloc(1, sizeof(*s));
 224         s->af = AF_INET;
 225         if (inet_pton(s->af, str, &s->addr.in))
 226                 goto add;
 227
 228         s->af = AF_INET6;
 229         if (inet_pton(s->af, str, &s->addr.in))
 230                 goto add;
 231
 232         free(s);
 233         return;
 234
 235 add:
 236         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 237           s->af == AF_INET6 ? '6' : '4', str);
 238         vlist_simple_add(&ip->dns_servers, &s->node);
 239 }
 240
 241 void
 242 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 243 {
 244         struct blob_attr *cur;
 245         int rem;
 246
 247         blobmsg_for_each_attr(cur, list, rem) {
 248                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 249                         continue;
 250
 251                 if (!blobmsg_check_attr(cur, NULL))
 252                         continue;
 253
 254                 interface_add_dns_server(ip, blobmsg_data(cur));
 255         }
 256 }
 257
 258 static void
 259 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 260 {
 261         struct dns_search_domain *s;
 262         int len = strlen(str);
 263
 264         s = calloc(1, sizeof(*s) + len + 1);
 265         if (!s)
 266                 return;
 267
 268         D(INTERFACE, "Add DNS search domain: %s\n", str);
 269         memcpy(s->name, str, len);
 270         vlist_simple_add(&ip->dns_search, &s->node);
 271 }
 272
 273 void
 274 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 275 {
 276         struct blob_attr *cur;
 277         int rem;
 278
 279         blobmsg_for_each_attr(cur, list, rem) {
 280                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 281                         continue;
 282
 283                 if (!blobmsg_check_attr(cur, NULL))
 284                         continue;
 285
 286                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 287         }
 288 }
 289
 290 static void
 291 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 292 {
 293         struct dns_server *s;
 294         struct dns_search_domain *d;
 295         const char *str;
 296         char buf[32];
 297
 298         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 299                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 300                 if (!str)
 301                         continue;
 302
 303                 fprintf(f, "nameserver %s\n", str);
 304         }
 305
 306         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 307                 fprintf(f, "search %s\n", d->name);
 308         }
 309 }
 310
 311 void
 312 interface_write_resolv_conf(void)
 313 {
 314         struct interface *iface;
 315         char *path = alloca(strlen(resolv_conf) + 5);
 316         FILE *f;
 317
 318         sprintf(path, "%s.tmp", resolv_conf);
 319         unlink(path);
 320         f = fopen(path, "w");
 321         if (!f) {
 322                 D(INTERFACE, "Failed to open %s for writing\n", path);
 323                 return;
 324         }
 325
 326         vlist_for_each_element(&interfaces, iface, node) {
 327                 if (iface->state != IFS_UP)
 328                         continue;
 329
 330                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 331                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 332                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 333                     vlist_simple_empty(&iface->config_ip.dns_servers))
 334                         continue;
 335
 336                 fprintf(f, "# Interface %s\n", iface->name);
 337                 write_resolv_conf_entries(f, &iface->config_ip);
 338                 write_resolv_conf_entries(f, &iface->proto_ip);
 339         }
 340         fclose(f);
 341         if (rename(path, resolv_conf) < 0) {
 342                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 343                 unlink(path);
 344         }
 345 }
 346
 347 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 348 {
 349         struct device_addr *addr;
 350         struct device_route *route;
 351         struct device *dev;
 352
 353         ip->enabled = enabled;
 354         dev = ip->iface->l3_dev->dev;
 355         if (!dev)
 356                 return;
 357
 358         vlist_for_each_element(&ip->addr, addr, node) {
 359                 if (addr->enabled == enabled)
 360                         continue;
 361
 362                 if (enabled)
 363                         system_add_address(dev, addr);
 364                 else
 365                         system_del_address(dev, addr);
 366                 addr->enabled = enabled;
 367         }
 368
 369         vlist_for_each_element(&ip->route, route, node) {
 370                 bool _enabled = enabled;
 371
 372                 if (!enable_route(ip, route))
 373                         _enabled = false;
 374
 375                 if (route->enabled == _enabled)
 376                         continue;
 377
 378                 if (_enabled)
 379                         system_add_route(dev, route);
 380                 else
 381                         system_del_route(dev, route);
 382                 route->enabled = _enabled;
 383         }
 384 }
 385
 386 void
 387 interface_ip_update_start(struct interface_ip_settings *ip)
 388 {
 389         vlist_simple_update(&ip->dns_servers);
 390         vlist_simple_update(&ip->dns_search);
 391         vlist_update(&ip->route);
 392         vlist_update(&ip->addr);
 393 }
 394
 395 void
 396 interface_ip_update_complete(struct interface_ip_settings *ip)
 397 {
 398         vlist_simple_flush(&ip->dns_servers);
 399         vlist_simple_flush(&ip->dns_search);
 400         vlist_flush(&ip->route);
 401         vlist_flush(&ip->addr);
 402 }
 403
 404 void
 405 interface_ip_flush(struct interface_ip_settings *ip)
 406 {
 407         vlist_simple_flush_all(&ip->dns_servers);
 408         vlist_simple_flush_all(&ip->dns_search);
 409         vlist_flush_all(&ip->route);
 410         vlist_flush_all(&ip->addr);
 411 }
 412
 413 void
 414 interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 415 {
 416         ip->iface = iface;
 417         ip->enabled = true;
 418         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 419         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 420         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 421         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 422 }