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