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         } else {
  87                 route->flags |= DEVADDR_DEVICE;
  88         }
  89
  90         if ((cur = tb[ROUTE_METRIC]) != NULL)
  91                 route->metric = blobmsg_get_u32(cur);
  92
  93         if ((cur = tb[ROUTE_MTU]) != NULL)
  94                 route->mtu = blobmsg_get_u32(cur);
  95
  96         vlist_add(&ip->route, &route->node, &route->mask);
  97         return;
  98
  99 error:
 100         free(route);
 101 }
 102
 103 static int
 104 addr_cmp(const void *k1, const void *k2, void *ptr)
 105 {
 106         return memcmp(k1, k2, sizeof(struct device_addr) -
 107                       offsetof(struct device_addr, mask));
 108 }
 109
 110 static int
 111 route_cmp(const void *k1, const void *k2, void *ptr)
 112 {
 113         return memcmp(k1, k2, sizeof(struct device_route) -
 114                       offsetof(struct device_route, mask));
 115 }
 116
 117 static void
 118 interface_update_proto_addr(struct vlist_tree *tree,
 119                             struct vlist_node *node_new,
 120                             struct vlist_node *node_old)
 121 {
 122         struct interface_ip_settings *ip;
 123         struct interface *iface;
 124         struct device *dev;
 125         struct device_addr *a_new = NULL, *a_old = NULL;
 126         bool keep = false;
 127
 128         ip = container_of(tree, struct interface_ip_settings, addr);
 129         iface = ip->iface;
 130         dev = iface->l3_dev->dev;
 131
 132         if (node_new) {
 133                 a_new = container_of(node_new, struct device_addr, node);
 134
 135                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 136                     !a_new->broadcast) {
 137
 138                         uint32_t mask = ~0;
 139                         uint32_t *a = (uint32_t *) &a_new->addr;
 140
 141                         mask >>= a_new->mask;
 142                         a_new->broadcast = *a | mask;
 143                 }
 144         }
 145
 146         if (node_old)
 147                 a_old = container_of(node_old, struct device_addr, node);
 148
 149         if (a_new && a_old) {
 150                 keep = true;
 151
 152                 if (a_old->flags != a_new->flags)
 153                         keep = false;
 154
 155                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 156                     a_new->broadcast != a_old->broadcast)
 157                         keep = false;
 158         }
 159
 160         if (node_old) {
 161                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep)
 162                         system_del_address(dev, a_old);
 163                 free(a_old);
 164         }
 165
 166         if (node_new) {
 167                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
 168                         system_add_address(dev, a_new);
 169                 a_new->enabled = true;
 170         }
 171 }
 172
 173 static bool
 174 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 175 {
 176         if (ip->no_defaultroute && !route->mask)
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static void
 183 interface_update_proto_route(struct vlist_tree *tree,
 184                              struct vlist_node *node_new,
 185                              struct vlist_node *node_old)
 186 {
 187         struct interface_ip_settings *ip;
 188         struct interface *iface;
 189         struct device *dev;
 190         struct device_route *route_old, *route_new;
 191         bool keep = false;
 192
 193         ip = container_of(tree, struct interface_ip_settings, route);
 194         iface = ip->iface;
 195         dev = iface->l3_dev->dev;
 196
 197         route_old = container_of(node_old, struct device_route, node);
 198         route_new = container_of(node_new, struct device_route, node);
 199
 200         if (node_old && node_new)
 201                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 202
 203         if (node_old) {
 204                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 205                         system_del_route(dev, route_old);
 206                 free(route_old);
 207         }
 208
 209         if (node_new) {
 210                 bool _enabled = enable_route(ip, route_new);
 211
 212                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 213                         system_add_route(dev, route_new);
 214
 215                 route_new->enabled = _enabled;
 216         }
 217 }
 218
 219 void
 220 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 221 {
 222         struct dns_server *s;
 223
 224         s = calloc(1, sizeof(*s));
 225         s->af = AF_INET;
 226         if (inet_pton(s->af, str, &s->addr.in))
 227                 goto add;
 228
 229         s->af = AF_INET6;
 230         if (inet_pton(s->af, str, &s->addr.in))
 231                 goto add;
 232
 233         free(s);
 234         return;
 235
 236 add:
 237         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 238           s->af == AF_INET6 ? '6' : '4', str);
 239         vlist_simple_add(&ip->dns_servers, &s->node);
 240 }
 241
 242 void
 243 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 244 {
 245         struct blob_attr *cur;
 246         int rem;
 247
 248         blobmsg_for_each_attr(cur, list, rem) {
 249                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 250                         continue;
 251
 252                 if (!blobmsg_check_attr(cur, NULL))
 253                         continue;
 254
 255                 interface_add_dns_server(ip, blobmsg_data(cur));
 256         }
 257 }
 258
 259 static void
 260 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 261 {
 262         struct dns_search_domain *s;
 263         int len = strlen(str);
 264
 265         s = calloc(1, sizeof(*s) + len + 1);
 266         if (!s)
 267                 return;
 268
 269         D(INTERFACE, "Add DNS search domain: %s\n", str);
 270         memcpy(s->name, str, len);
 271         vlist_simple_add(&ip->dns_search, &s->node);
 272 }
 273
 274 void
 275 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 276 {
 277         struct blob_attr *cur;
 278         int rem;
 279
 280         blobmsg_for_each_attr(cur, list, rem) {
 281                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 282                         continue;
 283
 284                 if (!blobmsg_check_attr(cur, NULL))
 285                         continue;
 286
 287                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 288         }
 289 }
 290
 291 static void
 292 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 293 {
 294         struct dns_server *s;
 295         struct dns_search_domain *d;
 296         const char *str;
 297         char buf[32];
 298
 299         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 300                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 301                 if (!str)
 302                         continue;
 303
 304                 fprintf(f, "nameserver %s\n", str);
 305         }
 306
 307         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 308                 fprintf(f, "search %s\n", d->name);
 309         }
 310 }
 311
 312 void
 313 interface_write_resolv_conf(void)
 314 {
 315         struct interface *iface;
 316         char *path = alloca(strlen(resolv_conf) + 5);
 317         FILE *f;
 318
 319         sprintf(path, "%s.tmp", resolv_conf);
 320         unlink(path);
 321         f = fopen(path, "w");
 322         if (!f) {
 323                 D(INTERFACE, "Failed to open %s for writing\n", path);
 324                 return;
 325         }
 326
 327         vlist_for_each_element(&interfaces, iface, node) {
 328                 if (iface->state != IFS_UP)
 329                         continue;
 330
 331                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 332                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 333                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 334                     vlist_simple_empty(&iface->config_ip.dns_servers))
 335                         continue;
 336
 337                 fprintf(f, "# Interface %s\n", iface->name);
 338                 write_resolv_conf_entries(f, &iface->config_ip);
 339                 write_resolv_conf_entries(f, &iface->proto_ip);
 340         }
 341         fclose(f);
 342         if (rename(path, resolv_conf) < 0) {
 343                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 344                 unlink(path);
 345         }
 346 }
 347
 348 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 349 {
 350         struct device_addr *addr;
 351         struct device_route *route;
 352         struct device *dev;
 353
 354         ip->enabled = enabled;
 355         dev = ip->iface->l3_dev->dev;
 356         if (!dev)
 357                 return;
 358
 359         vlist_for_each_element(&ip->addr, addr, node) {
 360                 if (addr->enabled == enabled)
 361                         continue;
 362
 363                 if (enabled)
 364                         system_add_address(dev, addr);
 365                 else
 366                         system_del_address(dev, addr);
 367                 addr->enabled = enabled;
 368         }
 369
 370         vlist_for_each_element(&ip->route, route, node) {
 371                 bool _enabled = enabled;
 372
 373                 if (!enable_route(ip, route))
 374                         _enabled = false;
 375
 376                 if (route->enabled == _enabled)
 377                         continue;
 378
 379                 if (_enabled)
 380                         system_add_route(dev, route);
 381                 else
 382                         system_del_route(dev, route);
 383                 route->enabled = _enabled;
 384         }
 385 }
 386
 387 void
 388 interface_ip_update_start(struct interface_ip_settings *ip)
 389 {
 390         vlist_simple_update(&ip->dns_servers);
 391         vlist_simple_update(&ip->dns_search);
 392         vlist_update(&ip->route);
 393         vlist_update(&ip->addr);
 394 }
 395
 396 void
 397 interface_ip_update_complete(struct interface_ip_settings *ip)
 398 {
 399         vlist_simple_flush(&ip->dns_servers);
 400         vlist_simple_flush(&ip->dns_search);
 401         vlist_flush(&ip->route);
 402         vlist_flush(&ip->addr);
 403 }
 404
 405 void
 406 interface_ip_flush(struct interface_ip_settings *ip)
 407 {
 408         vlist_simple_flush_all(&ip->dns_servers);
 409         vlist_simple_flush_all(&ip->dns_search);
 410         vlist_flush_all(&ip->route);
 411         vlist_flush_all(&ip->addr);
 412 }
 413
 414 void
 415 interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 416 {
 417         ip->iface = iface;
 418         ip->enabled = true;
 419         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 420         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 421         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 422         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 423 }