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