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         else
  93                 route->metric = -1;
  94
  95         if ((cur = tb[ROUTE_MTU]) != NULL)
  96                 route->mtu = blobmsg_get_u32(cur);
  97
  98         vlist_add(&ip->route, &route->node, &route->mask);
  99         return;
 100
 101 error:
 102         free(route);
 103 }
 104
 105 static int
 106 addr_cmp(const void *k1, const void *k2, void *ptr)
 107 {
 108         return memcmp(k1, k2, sizeof(struct device_addr) -
 109                       offsetof(struct device_addr, mask));
 110 }
 111
 112 static int
 113 route_cmp(const void *k1, const void *k2, void *ptr)
 114 {
 115         return memcmp(k1, k2, sizeof(struct device_route) -
 116                       offsetof(struct device_route, mask));
 117 }
 118
 119 static void
 120 interface_update_proto_addr(struct vlist_tree *tree,
 121                             struct vlist_node *node_new,
 122                             struct vlist_node *node_old)
 123 {
 124         struct interface_ip_settings *ip;
 125         struct interface *iface;
 126         struct device *dev;
 127         struct device_addr *a_new = NULL, *a_old = NULL;
 128         bool keep = false;
 129
 130         ip = container_of(tree, struct interface_ip_settings, addr);
 131         iface = ip->iface;
 132         dev = iface->l3_dev->dev;
 133
 134         if (node_new) {
 135                 a_new = container_of(node_new, struct device_addr, node);
 136
 137                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 138                     !a_new->broadcast) {
 139
 140                         uint32_t mask = ~0;
 141                         uint32_t *a = (uint32_t *) &a_new->addr;
 142
 143                         mask >>= a_new->mask;
 144                         a_new->broadcast = *a | mask;
 145                 }
 146         }
 147
 148         if (node_old)
 149                 a_old = container_of(node_old, struct device_addr, node);
 150
 151         if (a_new && a_old) {
 152                 keep = true;
 153
 154                 if (a_old->flags != a_new->flags)
 155                         keep = false;
 156
 157                 if ((a_new->flags & DEVADDR_FAMILY) == DEVADDR_INET4 &&
 158                     a_new->broadcast != a_old->broadcast)
 159                         keep = false;
 160         }
 161
 162         if (node_old) {
 163                 if (!(a_old->flags & DEVADDR_EXTERNAL) && a_old->enabled && !keep)
 164                         system_del_address(dev, a_old);
 165                 free(a_old);
 166         }
 167
 168         if (node_new) {
 169                 if (!(a_new->flags & DEVADDR_EXTERNAL) && !keep)
 170                         system_add_address(dev, a_new);
 171                 a_new->enabled = true;
 172         }
 173 }
 174
 175 static bool
 176 enable_route(struct interface_ip_settings *ip, struct device_route *route)
 177 {
 178         if (ip->no_defaultroute && !route->mask)
 179                 return false;
 180
 181         return true;
 182 }
 183
 184 static void
 185 interface_update_proto_route(struct vlist_tree *tree,
 186                              struct vlist_node *node_new,
 187                              struct vlist_node *node_old)
 188 {
 189         struct interface_ip_settings *ip;
 190         struct interface *iface;
 191         struct device *dev;
 192         struct device_route *route_old, *route_new;
 193         bool keep = false;
 194
 195         ip = container_of(tree, struct interface_ip_settings, route);
 196         iface = ip->iface;
 197         dev = iface->l3_dev->dev;
 198
 199         route_old = container_of(node_old, struct device_route, node);
 200         route_new = container_of(node_new, struct device_route, node);
 201
 202         if (node_old && node_new)
 203                 keep = !memcmp(&route_old->nexthop, &route_new->nexthop, sizeof(route_old->nexthop));
 204
 205         if (node_old) {
 206                 if (!(route_old->flags & DEVADDR_EXTERNAL) && route_old->enabled && !keep)
 207                         system_del_route(dev, route_old);
 208                 free(route_old);
 209         }
 210
 211         if (node_new) {
 212                 bool _enabled = enable_route(ip, route_new);
 213
 214                 if (!(route_new->flags & DEVADDR_EXTERNAL) && !keep && _enabled)
 215                         system_add_route(dev, route_new);
 216
 217                 route_new->enabled = _enabled;
 218         }
 219 }
 220
 221 void
 222 interface_add_dns_server(struct interface_ip_settings *ip, const char *str)
 223 {
 224         struct dns_server *s;
 225
 226         s = calloc(1, sizeof(*s));
 227         s->af = AF_INET;
 228         if (inet_pton(s->af, str, &s->addr.in))
 229                 goto add;
 230
 231         s->af = AF_INET6;
 232         if (inet_pton(s->af, str, &s->addr.in))
 233                 goto add;
 234
 235         free(s);
 236         return;
 237
 238 add:
 239         D(INTERFACE, "Add IPv%c DNS server: %s\n",
 240           s->af == AF_INET6 ? '6' : '4', str);
 241         vlist_simple_add(&ip->dns_servers, &s->node);
 242 }
 243
 244 void
 245 interface_add_dns_server_list(struct interface_ip_settings *ip, struct blob_attr *list)
 246 {
 247         struct blob_attr *cur;
 248         int rem;
 249
 250         blobmsg_for_each_attr(cur, list, rem) {
 251                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 252                         continue;
 253
 254                 if (!blobmsg_check_attr(cur, NULL))
 255                         continue;
 256
 257                 interface_add_dns_server(ip, blobmsg_data(cur));
 258         }
 259 }
 260
 261 static void
 262 interface_add_dns_search_domain(struct interface_ip_settings *ip, const char *str)
 263 {
 264         struct dns_search_domain *s;
 265         int len = strlen(str);
 266
 267         s = calloc(1, sizeof(*s) + len + 1);
 268         if (!s)
 269                 return;
 270
 271         D(INTERFACE, "Add DNS search domain: %s\n", str);
 272         memcpy(s->name, str, len);
 273         vlist_simple_add(&ip->dns_search, &s->node);
 274 }
 275
 276 void
 277 interface_add_dns_search_list(struct interface_ip_settings *ip, struct blob_attr *list)
 278 {
 279         struct blob_attr *cur;
 280         int rem;
 281
 282         blobmsg_for_each_attr(cur, list, rem) {
 283                 if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
 284                         continue;
 285
 286                 if (!blobmsg_check_attr(cur, NULL))
 287                         continue;
 288
 289                 interface_add_dns_search_domain(ip, blobmsg_data(cur));
 290         }
 291 }
 292
 293 static void
 294 write_resolv_conf_entries(FILE *f, struct interface_ip_settings *ip)
 295 {
 296         struct dns_server *s;
 297         struct dns_search_domain *d;
 298         const char *str;
 299         char buf[32];
 300
 301         vlist_simple_for_each_element(&ip->dns_servers, s, node) {
 302                 str = inet_ntop(s->af, &s->addr, buf, sizeof(buf));
 303                 if (!str)
 304                         continue;
 305
 306                 fprintf(f, "nameserver %s\n", str);
 307         }
 308
 309         vlist_simple_for_each_element(&ip->dns_search, d, node) {
 310                 fprintf(f, "search %s\n", d->name);
 311         }
 312 }
 313
 314 void
 315 interface_write_resolv_conf(void)
 316 {
 317         struct interface *iface;
 318         char *path = alloca(strlen(resolv_conf) + 5);
 319         FILE *f;
 320
 321         sprintf(path, "%s.tmp", resolv_conf);
 322         unlink(path);
 323         f = fopen(path, "w");
 324         if (!f) {
 325                 D(INTERFACE, "Failed to open %s for writing\n", path);
 326                 return;
 327         }
 328
 329         vlist_for_each_element(&interfaces, iface, node) {
 330                 if (iface->state != IFS_UP)
 331                         continue;
 332
 333                 if (vlist_simple_empty(&iface->proto_ip.dns_search) &&
 334                     vlist_simple_empty(&iface->proto_ip.dns_servers) &&
 335                         vlist_simple_empty(&iface->config_ip.dns_search) &&
 336                     vlist_simple_empty(&iface->config_ip.dns_servers))
 337                         continue;
 338
 339                 fprintf(f, "# Interface %s\n", iface->name);
 340                 write_resolv_conf_entries(f, &iface->config_ip);
 341                 write_resolv_conf_entries(f, &iface->proto_ip);
 342         }
 343         fclose(f);
 344         if (rename(path, resolv_conf) < 0) {
 345                 D(INTERFACE, "Failed to replace %s\n", resolv_conf);
 346                 unlink(path);
 347         }
 348 }
 349
 350 void interface_ip_set_enabled(struct interface_ip_settings *ip, bool enabled)
 351 {
 352         struct device_addr *addr;
 353         struct device_route *route;
 354         struct device *dev;
 355
 356         ip->enabled = enabled;
 357         dev = ip->iface->l3_dev->dev;
 358         if (!dev)
 359                 return;
 360
 361         vlist_for_each_element(&ip->addr, addr, node) {
 362                 if (addr->enabled == enabled)
 363                         continue;
 364
 365                 if (enabled)
 366                         system_add_address(dev, addr);
 367                 else
 368                         system_del_address(dev, addr);
 369                 addr->enabled = enabled;
 370         }
 371
 372         vlist_for_each_element(&ip->route, route, node) {
 373                 bool _enabled = enabled;
 374
 375                 if (!enable_route(ip, route))
 376                         _enabled = false;
 377
 378                 if (route->enabled == _enabled)
 379                         continue;
 380
 381                 if (_enabled)
 382                         system_add_route(dev, route);
 383                 else
 384                         system_del_route(dev, route);
 385                 route->enabled = _enabled;
 386         }
 387 }
 388
 389 void
 390 interface_ip_update_start(struct interface_ip_settings *ip)
 391 {
 392         vlist_simple_update(&ip->dns_servers);
 393         vlist_simple_update(&ip->dns_search);
 394         vlist_update(&ip->route);
 395         vlist_update(&ip->addr);
 396 }
 397
 398 void
 399 interface_ip_update_complete(struct interface_ip_settings *ip)
 400 {
 401         vlist_simple_flush(&ip->dns_servers);
 402         vlist_simple_flush(&ip->dns_search);
 403         vlist_flush(&ip->route);
 404         vlist_flush(&ip->addr);
 405 }
 406
 407 void
 408 interface_ip_flush(struct interface_ip_settings *ip)
 409 {
 410         vlist_simple_flush_all(&ip->dns_servers);
 411         vlist_simple_flush_all(&ip->dns_search);
 412         vlist_flush_all(&ip->route);
 413         vlist_flush_all(&ip->addr);
 414 }
 415
 416 void
 417 interface_ip_init(struct interface_ip_settings *ip, struct interface *iface)
 418 {
 419         ip->iface = iface;
 420         ip->enabled = true;
 421         vlist_simple_init(&ip->dns_search, struct dns_search_domain, node);
 422         vlist_simple_init(&ip->dns_servers, struct dns_server, node);
 423         vlist_init(&ip->route, route_cmp, interface_update_proto_route);
 424         vlist_init(&ip->addr, addr_cmp, interface_update_proto_addr);
 425 }