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