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