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