system-linux.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  * Copyright (C) 2013 Steven Barth <steven@midlink.org>
   6  * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.org>
   7  * Copyright (C) 2017 Matthias Schiffer <mschiffer@universe-factory.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2
  11  * as published by the Free Software Foundation
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18 #define _GNU_SOURCE
  19
  20 #include <sys/socket.h>
  21 #include <sys/ioctl.h>
  22 #include <sys/stat.h>
  23 #include <sys/syscall.h>
  24
  25 #include <net/if.h>
  26 #include <net/if_arp.h>
  27
  28 #include <arpa/inet.h>
  29 #include <netinet/ether.h>
  30 #include <netinet/in.h>
  31
  32 #include <linux/rtnetlink.h>
  33 #include <linux/sockios.h>
  34 #include <linux/ip.h>
  35 #include <linux/if_addr.h>
  36 #include <linux/if_link.h>
  37 #include <linux/if_vlan.h>
  38 #include <linux/if_bridge.h>
  39 #include <linux/if_tunnel.h>
  40 #include <linux/ip6_tunnel.h>
  41 #include <linux/ethtool.h>
  42 #include <linux/fib_rules.h>
  43 #include <linux/veth.h>
  44 #include <linux/version.h>
  45
  46 #ifndef RTN_FAILED_POLICY
  47 #define RTN_FAILED_POLICY 12
  48 #endif
  49
  50 #ifndef IFA_F_NOPREFIXROUTE
  51 #define IFA_F_NOPREFIXROUTE 0x200
  52 #endif
  53
  54 #ifndef IFA_FLAGS
  55 #define IFA_FLAGS (IFA_MULTICAST + 1)
  56 #endif
  57
  58 #include <string.h>
  59 #include <fcntl.h>
  60 #include <glob.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #include <netlink/msg.h>
  65 #include <netlink/attr.h>
  66 #include <netlink/socket.h>
  67 #include <libubox/uloop.h>
  68
  69 #include "netifd.h"
  70 #include "device.h"
  71 #include "system.h"
  72
  73 struct event_socket {
  74         struct uloop_fd uloop;
  75         struct nl_sock *sock;
  76         int bufsize;
  77 };
  78
  79 static int sock_ioctl = -1;
  80 static struct nl_sock *sock_rtnl = NULL;
  81
  82 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  83 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  84 static int system_add_proto_tunnel(const char *name, const uint8_t proto,
  85                                         const unsigned int link, struct blob_attr **tb);
  86 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb);
  87
  88 static char dev_buf[256];
  89
  90 static void
  91 handler_nl_event(struct uloop_fd *u, unsigned int events)
  92 {
  93         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  94         int err;
  95         socklen_t errlen = sizeof(err);
  96
  97         if (!u->error) {
  98                 nl_recvmsgs_default(ev->sock);
  99                 return;
 100         }
 101
 102         if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
 103                 goto abort;
 104
 105         switch(err) {
 106         case ENOBUFS:
 107                 // Increase rx buffer size on netlink socket
 108                 ev->bufsize *= 2;
 109                 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 110                         goto abort;
 111
 112                 // Request full dump since some info got dropped
 113                 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
 114                 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
 115                 break;
 116
 117         default:
 118                 goto abort;
 119         }
 120         u->error = false;
 121         return;
 122
 123 abort:
 124         uloop_fd_delete(&ev->uloop);
 125         return;
 126 }
 127
 128 static struct nl_sock *
 129 create_socket(int protocol, int groups)
 130 {
 131         struct nl_sock *sock;
 132
 133         sock = nl_socket_alloc();
 134         if (!sock)
 135                 return NULL;
 136
 137         if (groups)
 138                 nl_join_groups(sock, groups);
 139
 140         if (nl_connect(sock, protocol))
 141                 return NULL;
 142
 143         return sock;
 144 }
 145
 146 static bool
 147 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
 148                         uloop_fd_handler cb, int flags)
 149 {
 150         ev->sock = create_socket(protocol, groups);
 151         if (!ev->sock)
 152                 return false;
 153
 154         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 155         ev->uloop.cb = cb;
 156         if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
 157                 return false;
 158
 159         return true;
 160 }
 161
 162 static bool
 163 create_event_socket(struct event_socket *ev, int protocol,
 164                     int (*cb)(struct nl_msg *msg, void *arg))
 165 {
 166         if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
 167                 return false;
 168
 169         // Install the valid custom callback handler
 170         nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 171
 172         // Disable sequence number checking on event sockets
 173         nl_socket_disable_seq_check(ev->sock);
 174
 175         // Increase rx buffer size to 65K on event sockets
 176         ev->bufsize = 65535;
 177         if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 178                 return false;
 179
 180         return true;
 181 }
 182
 183 static bool
 184 system_rtn_aton(const char *src, unsigned int *dst)
 185 {
 186         char *e;
 187         unsigned int n;
 188
 189         if (!strcmp(src, "local"))
 190                 n = RTN_LOCAL;
 191         else if (!strcmp(src, "nat"))
 192                 n = RTN_NAT;
 193         else if (!strcmp(src, "broadcast"))
 194                 n = RTN_BROADCAST;
 195         else if (!strcmp(src, "anycast"))
 196                 n = RTN_ANYCAST;
 197         else if (!strcmp(src, "multicast"))
 198                 n = RTN_MULTICAST;
 199         else if (!strcmp(src, "prohibit"))
 200                 n = RTN_PROHIBIT;
 201         else if (!strcmp(src, "unreachable"))
 202                 n = RTN_UNREACHABLE;
 203         else if (!strcmp(src, "blackhole"))
 204                 n = RTN_BLACKHOLE;
 205         else if (!strcmp(src, "xresolve"))
 206                 n = RTN_XRESOLVE;
 207         else if (!strcmp(src, "unicast"))
 208                 n = RTN_UNICAST;
 209         else if (!strcmp(src, "throw"))
 210                 n = RTN_THROW;
 211         else if (!strcmp(src, "failed_policy"))
 212                 n = RTN_FAILED_POLICY;
 213         else {
 214                 n = strtoul(src, &e, 0);
 215                 if (!e || *e || e == src || n > 255)
 216                         return false;
 217         }
 218
 219         *dst = n;
 220         return true;
 221 }
 222
 223 static bool
 224 system_tos_aton(const char *src, unsigned *dst)
 225 {
 226         char *e;
 227
 228         *dst = strtoul(src, &e, 16);
 229         if (e == src || *e || *dst > 255)
 230                 return false;
 231
 232         return true;
 233 }
 234
 235 int system_init(void)
 236 {
 237         static struct event_socket rtnl_event;
 238         static struct event_socket hotplug_event;
 239
 240         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 241         system_fd_set_cloexec(sock_ioctl);
 242
 243         // Prepare socket for routing / address control
 244         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 245         if (!sock_rtnl)
 246                 return -1;
 247
 248         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 249                 return -1;
 250
 251         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 252                                         handle_hotplug_event, 0))
 253                 return -1;
 254
 255         // Receive network link events form kernel
 256         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 257
 258         return 0;
 259 }
 260
 261 static void system_set_sysctl(const char *path, const char *val)
 262 {
 263         int fd;
 264
 265         fd = open(path, O_WRONLY);
 266         if (fd < 0)
 267                 return;
 268
 269         if (write(fd, val, strlen(val))) {}
 270         close(fd);
 271 }
 272
 273 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 274 {
 275         snprintf(dev_buf, sizeof(dev_buf), path, device);
 276         system_set_sysctl(dev_buf, val);
 277 }
 278
 279 static void system_set_disable_ipv6(struct device *dev, const char *val)
 280 {
 281         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 282 }
 283
 284 static void system_set_rpfilter(struct device *dev, const char *val)
 285 {
 286         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
 287 }
 288
 289 static void system_set_acceptlocal(struct device *dev, const char *val)
 290 {
 291         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
 292 }
 293
 294 static void system_set_igmpversion(struct device *dev, const char *val)
 295 {
 296         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version", dev->ifname, val);
 297 }
 298
 299 static void system_set_mldversion(struct device *dev, const char *val)
 300 {
 301         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version", dev->ifname, val);
 302 }
 303
 304 static void system_set_neigh4reachabletime(struct device *dev, const char *val)
 305 {
 306         system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms", dev->ifname, val);
 307 }
 308
 309 static void system_set_neigh6reachabletime(struct device *dev, const char *val)
 310 {
 311         system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms", dev->ifname, val);
 312 }
 313
 314 static void system_set_neigh4gcstaletime(struct device *dev, const char *val)
 315 {
 316         system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/gc_stale_time", dev->ifname, val);
 317 }
 318
 319 static void system_set_neigh6gcstaletime(struct device *dev, const char *val)
 320 {
 321         system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/gc_stale_time", dev->ifname, val);
 322 }
 323
 324 static void system_set_neigh4locktime(struct device *dev, const char *val)
 325 {
 326         system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/locktime", dev->ifname, val);
 327 }
 328
 329 static void system_set_dadtransmits(struct device *dev, const char *val)
 330 {
 331         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits", dev->ifname, val);
 332 }
 333
 334 static void system_bridge_set_multicast_to_unicast(struct device *dev, const char *val)
 335 {
 336         system_set_dev_sysctl("/sys/class/net/%s/brport/multicast_to_unicast", dev->ifname, val);
 337 }
 338
 339 static void system_bridge_set_multicast_fast_leave(struct device *dev, const char *val)
 340 {
 341         system_set_dev_sysctl("/sys/class/net/%s/brport/multicast_fast_leave", dev->ifname, val);
 342 }
 343
 344 static void system_bridge_set_hairpin_mode(struct device *dev, const char *val)
 345 {
 346         system_set_dev_sysctl("/sys/class/net/%s/brport/hairpin_mode", dev->ifname, val);
 347 }
 348
 349 static void system_bridge_set_isolate_mode(struct device *dev, const char *val)
 350 {
 351         system_set_dev_sysctl("/sys/class/net/%s/brport/isolate_mode", dev->ifname, val);
 352 }
 353
 354 static void system_bridge_set_multicast_router(struct device *dev, const char *val, bool bridge)
 355 {
 356         system_set_dev_sysctl(bridge ? "/sys/class/net/%s/bridge/multicast_router" :
 357                                        "/sys/class/net/%s/brport/multicast_router",
 358                               dev->ifname, val);
 359 }
 360
 361 static void system_bridge_set_robustness(struct device *dev, const char *val)
 362 {
 363         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_startup_query_count",
 364                               dev->ifname, val);
 365         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_last_member_count",
 366                               dev->ifname, val);
 367 }
 368
 369 static void system_bridge_set_query_interval(struct device *dev, const char *val)
 370 {
 371         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_query_interval",
 372                               dev->ifname, val);
 373 }
 374
 375 static void system_bridge_set_query_response_interval(struct device *dev, const char *val)
 376 {
 377         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_query_response_interval",
 378                               dev->ifname, val);
 379 }
 380
 381 static void system_bridge_set_last_member_interval(struct device *dev, const char *val)
 382 {
 383         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_last_member_interval",
 384                               dev->ifname, val);
 385 }
 386
 387 static void system_bridge_set_membership_interval(struct device *dev, const char *val)
 388 {
 389         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_membership_interval",
 390                               dev->ifname, val);
 391 }
 392
 393 static void system_bridge_set_other_querier_timeout(struct device *dev, const char *val)
 394 {
 395         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier_interval",
 396                               dev->ifname, val);
 397 }
 398
 399 static void system_bridge_set_startup_query_interval(struct device *dev, const char *val)
 400 {
 401         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_startup_query_interval",
 402                               dev->ifname, val);
 403 }
 404
 405 static void system_bridge_set_learning(struct device *dev, const char *val)
 406 {
 407         system_set_dev_sysctl("/sys/class/net/%s/brport/learning", dev->ifname, val);
 408 }
 409
 410 static void system_bridge_set_unicast_flood(struct device *dev, const char *val)
 411 {
 412         system_set_dev_sysctl("/sys/class/net/%s/brport/unicast_flood", dev->ifname, val);
 413 }
 414
 415 static void system_set_sendredirects(struct device *dev, const char *val)
 416 {
 417         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/send_redirects", dev->ifname, val);
 418 }
 419
 420 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 421 {
 422         int fd = -1, ret = -1;
 423
 424         fd = open(path, O_RDONLY);
 425         if (fd < 0)
 426                 goto out;
 427
 428         ssize_t len = read(fd, buf, buf_sz - 1);
 429         if (len < 0)
 430                 goto out;
 431
 432         ret = buf[len] = 0;
 433
 434 out:
 435         if (fd >= 0)
 436                 close(fd);
 437
 438         return ret;
 439 }
 440
 441 static int
 442 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
 443 {
 444         snprintf(dev_buf, sizeof(dev_buf), path, device);
 445         return system_get_sysctl(dev_buf, buf, buf_sz);
 446 }
 447
 448 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
 449 {
 450         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
 451                         dev->ifname, buf, buf_sz);
 452 }
 453
 454 static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
 455 {
 456         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
 457                         dev->ifname, buf, buf_sz);
 458 }
 459
 460 static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
 461 {
 462         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
 463                         dev->ifname, buf, buf_sz);
 464 }
 465
 466 static int system_get_igmpversion(struct device *dev, char *buf, const size_t buf_sz)
 467 {
 468         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version",
 469                         dev->ifname, buf, buf_sz);
 470 }
 471
 472 static int system_get_mldversion(struct device *dev, char *buf, const size_t buf_sz)
 473 {
 474         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version",
 475                         dev->ifname, buf, buf_sz);
 476 }
 477
 478 static int system_get_neigh4reachabletime(struct device *dev, char *buf, const size_t buf_sz)
 479 {
 480         return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms",
 481                         dev->ifname, buf, buf_sz);
 482 }
 483
 484 static int system_get_neigh6reachabletime(struct device *dev, char *buf, const size_t buf_sz)
 485 {
 486         return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms",
 487                         dev->ifname, buf, buf_sz);
 488 }
 489
 490 static int system_get_neigh4gcstaletime(struct device *dev, char *buf, const size_t buf_sz)
 491 {
 492         return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/gc_stale_time",
 493                         dev->ifname, buf, buf_sz);
 494 }
 495
 496 static int system_get_neigh6gcstaletime(struct device *dev, char *buf, const size_t buf_sz)
 497 {
 498         return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/gc_stale_time",
 499                         dev->ifname, buf, buf_sz);
 500 }
 501
 502 static int system_get_neigh4locktime(struct device *dev, char *buf, const size_t buf_sz)
 503 {
 504         return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/locktime",
 505                         dev->ifname, buf, buf_sz);
 506 }
 507
 508 static int system_get_dadtransmits(struct device *dev, char *buf, const size_t buf_sz)
 509 {
 510         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/dad_transmits",
 511                         dev->ifname, buf, buf_sz);
 512 }
 513
 514 static int system_get_sendredirects(struct device *dev, char *buf, const size_t buf_sz)
 515 {
 516         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/send_redirects",
 517                         dev->ifname, buf, buf_sz);
 518 }
 519
 520 // Evaluate netlink messages
 521 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 522 {
 523         struct nlmsghdr *nh = nlmsg_hdr(msg);
 524         struct nlattr *nla[__IFLA_MAX];
 525         int link_state = 0;
 526         char buf[10];
 527
 528         if (nh->nlmsg_type != RTM_NEWLINK)
 529                 goto out;
 530
 531         nlmsg_parse(nh, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
 532         if (!nla[IFLA_IFNAME])
 533                 goto out;
 534
 535         struct device *dev = device_find(nla_data(nla[IFLA_IFNAME]));
 536         if (!dev)
 537                 goto out;
 538
 539         if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
 540                 link_state = strtoul(buf, NULL, 0);
 541
 542         device_set_link(dev, link_state ? true : false);
 543
 544 out:
 545         return 0;
 546 }
 547
 548 static void
 549 handle_hotplug_msg(char *data, int size)
 550 {
 551         const char *subsystem = NULL, *interface = NULL, *interface_old = NULL;
 552         char *cur, *end, *sep;
 553         struct device *dev;
 554         int skip;
 555         bool add, move = false;
 556
 557         if (!strncmp(data, "add@", 4))
 558                 add = true;
 559         else if (!strncmp(data, "remove@", 7))
 560                 add = false;
 561         else if (!strncmp(data, "move@", 5)) {
 562                 add = true;
 563                 move = true;
 564         }
 565         else
 566                 return;
 567
 568         skip = strlen(data) + 1;
 569         end = data + size;
 570
 571         for (cur = data + skip; cur < end; cur += skip) {
 572                 skip = strlen(cur) + 1;
 573
 574                 sep = strchr(cur, '=');
 575                 if (!sep)
 576                         continue;
 577
 578                 *sep = 0;
 579                 if (!strcmp(cur, "INTERFACE"))
 580                         interface = sep + 1;
 581                 else if (!strcmp(cur, "SUBSYSTEM")) {
 582                         subsystem = sep + 1;
 583                         if (strcmp(subsystem, "net") != 0)
 584                                 return;
 585                 } else if (!strcmp(cur, "DEVPATH_OLD")) {
 586                         interface_old = strrchr(sep + 1, '/');
 587                         if (interface_old)
 588                                 interface_old++;
 589                 }
 590         }
 591
 592         if (subsystem && interface) {
 593                 if (move && interface_old)
 594                         goto move;
 595                 else
 596                         goto found;
 597         }
 598
 599         return;
 600
 601 move:
 602         dev = device_find(interface_old);
 603         if (!dev)
 604                 goto found;
 605
 606         if (dev->type != &simple_device_type)
 607                 goto found;
 608
 609         device_set_present(dev, false);
 610
 611 found:
 612         dev = device_find(interface);
 613         if (!dev)
 614                 return;
 615
 616         if (dev->type != &simple_device_type)
 617                 return;
 618
 619         if (add && system_if_force_external(dev->ifname))
 620                 return;
 621
 622         device_set_present(dev, add);
 623 }
 624
 625 static void
 626 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 627 {
 628         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 629         struct sockaddr_nl nla;
 630         unsigned char *buf = NULL;
 631         int size;
 632
 633         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 634                 if (nla.nl_pid == 0)
 635                         handle_hotplug_msg((char *) buf, size);
 636
 637                 free(buf);
 638         }
 639 }
 640
 641 static int system_rtnl_call(struct nl_msg *msg)
 642 {
 643         int ret;
 644
 645         ret = nl_send_auto_complete(sock_rtnl, msg);
 646         nlmsg_free(msg);
 647
 648         if (ret < 0)
 649                 return ret;
 650
 651         return nl_wait_for_ack(sock_rtnl);
 652 }
 653
 654 int system_bridge_delbr(struct device *bridge)
 655 {
 656         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 657 }
 658
 659 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 660 {
 661         struct ifreq ifr;
 662
 663         memset(&ifr, 0, sizeof(ifr));
 664         if (dev)
 665                 ifr.ifr_ifindex = dev->ifindex;
 666         else
 667                 ifr.ifr_data = data;
 668         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name) - 1);
 669         return ioctl(sock_ioctl, cmd, &ifr);
 670 }
 671
 672 static bool system_is_bridge(const char *name, char *buf, int buflen)
 673 {
 674         struct stat st;
 675
 676         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 677         if (stat(buf, &st) < 0)
 678                 return false;
 679
 680         return true;
 681 }
 682
 683 static char *system_get_bridge(const char *name, char *buf, int buflen)
 684 {
 685         char *path;
 686         ssize_t len = -1;
 687         glob_t gl;
 688
 689         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 690         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 691                 return NULL;
 692
 693         if (gl.gl_pathc > 0)
 694                 len = readlink(gl.gl_pathv[0], buf, buflen);
 695
 696         globfree(&gl);
 697
 698         if (len < 0)
 699                 return NULL;
 700
 701         buf[len] = 0;
 702         path = strrchr(buf, '/');
 703         if (!path)
 704                 return NULL;
 705
 706         return path + 1;
 707 }
 708
 709 static void
 710 system_bridge_set_wireless(struct device *bridge, struct device *dev)
 711 {
 712         bool mcast_to_ucast = dev->wireless_ap;
 713         bool hairpin = true;
 714
 715         if (bridge->settings.flags & DEV_OPT_MULTICAST_TO_UNICAST &&
 716             !bridge->settings.multicast_to_unicast)
 717                 mcast_to_ucast = false;
 718
 719         if (!mcast_to_ucast || dev->wireless_isolate)
 720                 hairpin = false;
 721
 722         system_bridge_set_multicast_to_unicast(dev, mcast_to_ucast ? "1" : "0");
 723         system_bridge_set_hairpin_mode(dev, hairpin ? "1" : "0");
 724 }
 725
 726 int system_bridge_addif(struct device *bridge, struct device *dev)
 727 {
 728         char buf[64];
 729         char *oldbr;
 730         int ret = 0;
 731
 732         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 733         if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
 734                 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 735
 736         if (dev->wireless)
 737                 system_bridge_set_wireless(bridge, dev);
 738
 739         if (dev->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
 740                 snprintf(buf, sizeof(buf), "%u", dev->settings.multicast_router);
 741                 system_bridge_set_multicast_router(dev, buf, false);
 742         }
 743
 744         if (dev->settings.flags & DEV_OPT_MULTICAST_FAST_LEAVE &&
 745             dev->settings.multicast_fast_leave)
 746                 system_bridge_set_multicast_fast_leave(dev, "1");
 747
 748         if (dev->settings.flags & DEV_OPT_LEARNING &&
 749             !dev->settings.learning)
 750                 system_bridge_set_learning(dev, "0");
 751
 752         if (dev->settings.flags & DEV_OPT_UNICAST_FLOOD &&
 753             !dev->settings.unicast_flood)
 754                 system_bridge_set_unicast_flood(dev, "0");
 755
 756         if (dev->settings.flags & DEV_OPT_ISOLATE &&
 757             dev->settings.isolate)
 758                 system_bridge_set_isolate_mode(dev, "1");
 759
 760         return ret;
 761 }
 762
 763 int system_bridge_delif(struct device *bridge, struct device *dev)
 764 {
 765         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 766 }
 767
 768 int system_if_resolve(struct device *dev)
 769 {
 770         struct ifreq ifr;
 771         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name) - 1);
 772         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 773                 return ifr.ifr_ifindex;
 774         else
 775                 return 0;
 776 }
 777
 778 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 779 {
 780         struct ifreq ifr;
 781
 782         memset(&ifr, 0, sizeof(ifr));
 783         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name) - 1);
 784         if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) < 0)
 785                 return -1;
 786
 787         ifr.ifr_flags |= add;
 788         ifr.ifr_flags &= ~rem;
 789         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 790 }
 791
 792 struct clear_data {
 793         struct nl_msg *msg;
 794         struct device *dev;
 795         int type;
 796         int size;
 797         int af;
 798 };
 799
 800
 801 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 802 {
 803         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 804
 805         return ifa->ifa_index == ifindex;
 806 }
 807
 808 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 809 {
 810         struct rtmsg *r = NLMSG_DATA(hdr);
 811         struct nlattr *tb[__RTA_MAX];
 812
 813         if (r->rtm_protocol == RTPROT_KERNEL &&
 814             r->rtm_family == AF_INET6)
 815                 return false;
 816
 817         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 818         if (!tb[RTA_OIF])
 819                 return false;
 820
 821         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 822 }
 823
 824 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 825 {
 826         return true;
 827 }
 828
 829 static int cb_clear_event(struct nl_msg *msg, void *arg)
 830 {
 831         struct clear_data *clr = arg;
 832         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 833         bool (*cb)(struct nlmsghdr *, int ifindex);
 834         int type;
 835
 836         switch(clr->type) {
 837         case RTM_GETADDR:
 838                 type = RTM_DELADDR;
 839                 if (hdr->nlmsg_type != RTM_NEWADDR)
 840                         return NL_SKIP;
 841
 842                 cb = check_ifaddr;
 843                 break;
 844         case RTM_GETROUTE:
 845                 type = RTM_DELROUTE;
 846                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 847                         return NL_SKIP;
 848
 849                 cb = check_route;
 850                 break;
 851         case RTM_GETRULE:
 852                 type = RTM_DELRULE;
 853                 if (hdr->nlmsg_type != RTM_NEWRULE)
 854                         return NL_SKIP;
 855
 856                 cb = check_rule;
 857                 break;
 858         default:
 859                 return NL_SKIP;
 860         }
 861
 862         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 863                 return NL_SKIP;
 864
 865         if (type == RTM_DELRULE)
 866                 D(SYSTEM, "Remove a rule\n");
 867         else
 868                 D(SYSTEM, "Remove %s from device %s\n",
 869                   type == RTM_DELADDR ? "an address" : "a route",
 870                   clr->dev->ifname);
 871         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 872         hdr = nlmsg_hdr(clr->msg);
 873         hdr->nlmsg_type = type;
 874         hdr->nlmsg_flags = NLM_F_REQUEST;
 875
 876         nl_socket_disable_auto_ack(sock_rtnl);
 877         nl_send_auto_complete(sock_rtnl, clr->msg);
 878         nl_socket_enable_auto_ack(sock_rtnl);
 879
 880         return NL_SKIP;
 881 }
 882
 883 static int
 884 cb_finish_event(struct nl_msg *msg, void *arg)
 885 {
 886         int *pending = arg;
 887         *pending = 0;
 888         return NL_STOP;
 889 }
 890
 891 static int
 892 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 893 {
 894         int *pending = arg;
 895         *pending = err->error;
 896         return NL_STOP;
 897 }
 898
 899 static void
 900 system_if_clear_entries(struct device *dev, int type, int af)
 901 {
 902         struct clear_data clr;
 903         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 904         struct rtmsg rtm = {
 905                 .rtm_family = af,
 906                 .rtm_flags = RTM_F_CLONED,
 907         };
 908         int flags = NLM_F_DUMP;
 909         int pending = 1;
 910
 911         clr.af = af;
 912         clr.dev = dev;
 913         clr.type = type;
 914         switch (type) {
 915         case RTM_GETADDR:
 916         case RTM_GETRULE:
 917                 clr.size = sizeof(struct rtgenmsg);
 918                 break;
 919         case RTM_GETROUTE:
 920                 clr.size = sizeof(struct rtmsg);
 921                 break;
 922         default:
 923                 return;
 924         }
 925
 926         if (!cb)
 927                 return;
 928
 929         clr.msg = nlmsg_alloc_simple(type, flags);
 930         if (!clr.msg)
 931                 goto out;
 932
 933         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 934         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 935         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 936         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 937
 938         nl_send_auto_complete(sock_rtnl, clr.msg);
 939         while (pending > 0)
 940                 nl_recvmsgs(sock_rtnl, cb);
 941
 942         nlmsg_free(clr.msg);
 943 out:
 944         nl_cb_put(cb);
 945 }
 946
 947 /*
 948  * Clear bridge (membership) state and bring down device
 949  */
 950 void system_if_clear_state(struct device *dev)
 951 {
 952         static char buf[256];
 953         char *bridge;
 954
 955         device_set_ifindex(dev, system_if_resolve(dev));
 956         if (dev->external || !dev->ifindex)
 957                 return;
 958
 959         system_if_flags(dev->ifname, 0, IFF_UP);
 960
 961         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 962                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 963                 system_bridge_delbr(dev);
 964                 return;
 965         }
 966
 967         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 968         if (bridge) {
 969                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 970                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 971         }
 972
 973         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 974         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 975         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 976         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 977         system_set_disable_ipv6(dev, "0");
 978 }
 979
 980 static inline unsigned long
 981 sec_to_jiffies(int val)
 982 {
 983         return (unsigned long) val * 100;
 984 }
 985
 986 static void system_bridge_conf_multicast_deps(struct device *bridge,
 987                                               struct bridge_config *cfg,
 988                                               char *buf,
 989                                               int buf_len)
 990 {
 991         int val;
 992
 993         if (cfg->flags & BRIDGE_OPT_ROBUSTNESS ||
 994             cfg->flags & BRIDGE_OPT_QUERY_INTERVAL ||
 995             cfg->flags & BRIDGE_OPT_QUERY_RESPONSE_INTERVAL) {
 996                 val = cfg->robustness * cfg->query_interval +
 997                         cfg->query_response_interval;
 998
 999                 snprintf(buf, buf_len, "%i", val);
1000                 system_bridge_set_membership_interval(bridge, buf);
1001
1002                 val = cfg->robustness * cfg->query_interval +
1003                         cfg->query_response_interval / 2;
1004
1005                 snprintf(buf, buf_len, "%i", val);
1006                 system_bridge_set_other_querier_timeout(bridge, buf);
1007         }
1008
1009         if (cfg->flags & BRIDGE_OPT_QUERY_INTERVAL) {
1010                 val = cfg->query_interval / 4;
1011
1012                 snprintf(buf, buf_len, "%i", val);
1013                 system_bridge_set_startup_query_interval(bridge, buf);
1014         }
1015 }
1016
1017 static void system_bridge_conf_multicast(struct device *bridge,
1018                                          struct bridge_config *cfg,
1019                                          char *buf,
1020                                          int buf_len)
1021 {
1022         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
1023                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
1024
1025         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
1026                 bridge->ifname, cfg->multicast_querier ? "1" : "0");
1027
1028         snprintf(buf, buf_len, "%i", cfg->hash_max);
1029         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/hash_max",
1030                 bridge->ifname, buf);
1031
1032         if (bridge->settings.flags & DEV_OPT_MULTICAST_ROUTER) {
1033                 snprintf(buf, buf_len, "%u", bridge->settings.multicast_router);
1034                 system_bridge_set_multicast_router(bridge, buf, true);
1035         }
1036
1037         if (cfg->flags & BRIDGE_OPT_ROBUSTNESS) {
1038                 snprintf(buf, buf_len, "%i", cfg->robustness);
1039                 system_bridge_set_robustness(bridge, buf);
1040         }
1041
1042         if (cfg->flags & BRIDGE_OPT_QUERY_INTERVAL) {
1043                 snprintf(buf, buf_len, "%i", cfg->query_interval);
1044                 system_bridge_set_query_interval(bridge, buf);
1045         }
1046
1047         if (cfg->flags & BRIDGE_OPT_QUERY_RESPONSE_INTERVAL) {
1048                 snprintf(buf, buf_len, "%i", cfg->query_response_interval);
1049                 system_bridge_set_query_response_interval(bridge, buf);
1050         }
1051
1052         if (cfg->flags & BRIDGE_OPT_LAST_MEMBER_INTERVAL) {
1053                 snprintf(buf, buf_len, "%i", cfg->last_member_interval);
1054                 system_bridge_set_last_member_interval(bridge, buf);
1055         }
1056
1057         system_bridge_conf_multicast_deps(bridge, cfg, buf, buf_len);
1058 }
1059
1060 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
1061 {
1062         char buf[64];
1063         unsigned long args[4] = {};
1064
1065         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
1066                 return -1;
1067
1068         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
1069         args[1] = !!cfg->stp;
1070         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1071
1072         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
1073         args[1] = sec_to_jiffies(cfg->forward_delay);
1074         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1075
1076         system_bridge_conf_multicast(bridge, cfg, buf, sizeof(buf));
1077
1078         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
1079         args[1] = cfg->priority;
1080         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1081
1082         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
1083                 args[0] = BRCTL_SET_AGEING_TIME;
1084                 args[1] = sec_to_jiffies(cfg->ageing_time);
1085                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1086         }
1087
1088         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
1089                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
1090                 args[1] = sec_to_jiffies(cfg->hello_time);
1091                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1092         }
1093
1094         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
1095                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
1096                 args[1] = sec_to_jiffies(cfg->max_age);
1097                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
1098         }
1099
1100         return 0;
1101 }
1102
1103 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
1104 {
1105         struct nl_msg *msg;
1106         struct nlattr *linkinfo, *data;
1107         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
1108         int i, rv;
1109         static const struct {
1110                 const char *name;
1111                 enum macvlan_mode val;
1112         } modes[] = {
1113                 { "private", MACVLAN_MODE_PRIVATE },
1114                 { "vepa", MACVLAN_MODE_VEPA },
1115                 { "bridge", MACVLAN_MODE_BRIDGE },
1116                 { "passthru", MACVLAN_MODE_PASSTHRU },
1117         };
1118
1119         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
1120
1121         if (!msg)
1122                 return -1;
1123
1124         nlmsg_append(msg, &iim, sizeof(iim), 0);
1125
1126         if (cfg->flags & MACVLAN_OPT_MACADDR)
1127                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
1128         nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
1129         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
1130
1131         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
1132                 goto nla_put_failure;
1133
1134         nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
1135
1136         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
1137                 goto nla_put_failure;
1138
1139         if (cfg->mode) {
1140                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
1141                         if (strcmp(cfg->mode, modes[i].name) != 0)
1142                                 continue;
1143
1144                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
1145                         break;
1146                 }
1147         }
1148
1149         nla_nest_end(msg, data);
1150         nla_nest_end(msg, linkinfo);
1151
1152         rv = system_rtnl_call(msg);
1153         if (rv)
1154                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
1155
1156         return rv;
1157
1158 nla_put_failure:
1159         nlmsg_free(msg);
1160         return -ENOMEM;
1161 }
1162
1163 static int system_link_del(const char *ifname)
1164 {
1165         struct nl_msg *msg;
1166         struct ifinfomsg iim = {
1167                 .ifi_family = AF_UNSPEC,
1168                 .ifi_index = 0,
1169         };
1170
1171         msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
1172
1173         if (!msg)
1174                 return -1;
1175
1176         nlmsg_append(msg, &iim, sizeof(iim), 0);
1177         nla_put_string(msg, IFLA_IFNAME, ifname);
1178         return system_rtnl_call(msg);
1179 }
1180
1181 int system_macvlan_del(struct device *macvlan)
1182 {
1183         return system_link_del(macvlan->ifname);
1184 }
1185
1186 int system_veth_add(struct device *veth, struct veth_config *cfg)
1187 {
1188         struct nl_msg *msg;
1189         struct ifinfomsg empty_iim = {};
1190         struct nlattr *linkinfo, *data, *veth_info;
1191         int rv;
1192
1193         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
1194
1195         if (!msg)
1196                 return -1;
1197
1198         nlmsg_append(msg, &empty_iim, sizeof(empty_iim), 0);
1199
1200         if (cfg->flags & VETH_OPT_MACADDR)
1201                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
1202         nla_put_string(msg, IFLA_IFNAME, veth->ifname);
1203
1204         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
1205                 goto nla_put_failure;
1206
1207         nla_put_string(msg, IFLA_INFO_KIND, "veth");
1208
1209         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
1210                 goto nla_put_failure;
1211
1212         if (!(veth_info = nla_nest_start(msg, VETH_INFO_PEER)))
1213                 goto nla_put_failure;
1214
1215         nlmsg_append(msg, &empty_iim, sizeof(empty_iim), 0);
1216
1217         if (cfg->flags & VETH_OPT_PEER_NAME)
1218                 nla_put_string(msg, IFLA_IFNAME, cfg->peer_name);
1219         if (cfg->flags & VETH_OPT_PEER_MACADDR)
1220                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->peer_macaddr), cfg->peer_macaddr);
1221
1222         nla_nest_end(msg, veth_info);
1223         nla_nest_end(msg, data);
1224         nla_nest_end(msg, linkinfo);
1225
1226         rv = system_rtnl_call(msg);
1227         if (rv) {
1228                 if (cfg->flags & VETH_OPT_PEER_NAME)
1229                         D(SYSTEM, "Error adding veth '%s' with peer '%s': %d\n", veth->ifname, cfg->peer_name, rv);
1230                 else
1231                         D(SYSTEM, "Error adding veth '%s': %d\n", veth->ifname, rv);
1232         }
1233
1234         return rv;
1235
1236 nla_put_failure:
1237         nlmsg_free(msg);
1238         return -ENOMEM;
1239 }
1240
1241 int system_veth_del(struct device *veth)
1242 {
1243         return system_link_del(veth->ifname);
1244 }
1245
1246 static int system_vlan(struct device *dev, int id)
1247 {
1248         struct vlan_ioctl_args ifr = {
1249                 .cmd = SET_VLAN_NAME_TYPE_CMD,
1250                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
1251         };
1252
1253         if (ioctl(sock_ioctl, SIOCSIFVLAN, &ifr) < 0)
1254                 return -1;
1255
1256         if (id < 0) {
1257                 ifr.cmd = DEL_VLAN_CMD;
1258                 ifr.u.VID = 0;
1259         } else {
1260                 ifr.cmd = ADD_VLAN_CMD;
1261                 ifr.u.VID = id;
1262         }
1263         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
1264         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
1265 }
1266
1267 int system_vlan_add(struct device *dev, int id)
1268 {
1269         return system_vlan(dev, id);
1270 }
1271
1272 int system_vlan_del(struct device *dev)
1273 {
1274         return system_vlan(dev, -1);
1275 }
1276
1277 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
1278 {
1279         struct nl_msg *msg;
1280         struct nlattr *linkinfo, *data;
1281         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
1282         int rv;
1283
1284         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
1285
1286         if (!msg)
1287                 return -1;
1288
1289         nlmsg_append(msg, &iim, sizeof(iim), 0);
1290         nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
1291         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
1292
1293         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
1294                 goto nla_put_failure;
1295
1296         nla_put_string(msg, IFLA_INFO_KIND, "vlan");
1297
1298         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
1299                 goto nla_put_failure;
1300
1301         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
1302
1303 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
1304         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
1305 #else
1306         if(cfg->proto == VLAN_PROTO_8021AD)
1307                 netifd_log_message(L_WARNING, "%s Your kernel is older than linux 3.10.0, 802.1ad is not supported defaulting to 802.1q", vlandev->type->name);
1308 #endif
1309
1310         nla_nest_end(msg, data);
1311         nla_nest_end(msg, linkinfo);
1312
1313         rv = system_rtnl_call(msg);
1314         if (rv)
1315                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
1316
1317         return rv;
1318
1319 nla_put_failure:
1320         nlmsg_free(msg);
1321         return -ENOMEM;
1322 }
1323
1324 int system_vlandev_del(struct device *vlandev)
1325 {
1326         return system_link_del(vlandev->ifname);
1327 }
1328
1329 void
1330 system_if_get_settings(struct device *dev, struct device_settings *s)
1331 {
1332         struct ifreq ifr;
1333         char buf[10];
1334
1335         memset(&ifr, 0, sizeof(ifr));
1336         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name) - 1);
1337
1338         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
1339                 s->mtu = ifr.ifr_mtu;
1340                 s->flags |= DEV_OPT_MTU;
1341         }
1342
1343         s->mtu6 = system_update_ipv6_mtu(dev, 0);
1344         if (s->mtu6 > 0)
1345                 s->flags |= DEV_OPT_MTU6;
1346
1347         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
1348                 s->txqueuelen = ifr.ifr_qlen;
1349                 s->flags |= DEV_OPT_TXQUEUELEN;
1350         }
1351
1352         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
1353                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
1354                 s->flags |= DEV_OPT_MACADDR;
1355         }
1356
1357         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
1358                 s->ipv6 = !strtoul(buf, NULL, 0);
1359                 s->flags |= DEV_OPT_IPV6;
1360         }
1361
1362         if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
1363                 s->promisc = ifr.ifr_flags & IFF_PROMISC;
1364                 s->flags |= DEV_OPT_PROMISC;
1365
1366                 s->multicast = ifr.ifr_flags & IFF_MULTICAST;
1367                 s->flags |= DEV_OPT_MULTICAST;
1368         }
1369
1370         if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
1371                 s->rpfilter = strtoul(buf, NULL, 0);
1372                 s->flags |= DEV_OPT_RPFILTER;
1373         }
1374
1375         if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
1376                 s->acceptlocal = strtoul(buf, NULL, 0);
1377                 s->flags |= DEV_OPT_ACCEPTLOCAL;
1378         }
1379
1380         if (!system_get_igmpversion(dev, buf, sizeof(buf))) {
1381                 s->igmpversion = strtoul(buf, NULL, 0);
1382                 s->flags |= DEV_OPT_IGMPVERSION;
1383         }
1384
1385         if (!system_get_mldversion(dev, buf, sizeof(buf))) {
1386                 s->mldversion = strtoul(buf, NULL, 0);
1387                 s->flags |= DEV_OPT_MLDVERSION;
1388         }
1389
1390         if (!system_get_neigh4reachabletime(dev, buf, sizeof(buf))) {
1391                 s->neigh4reachabletime = strtoul(buf, NULL, 0);
1392                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1393         }
1394
1395         if (!system_get_neigh6reachabletime(dev, buf, sizeof(buf))) {
1396                 s->neigh6reachabletime = strtoul(buf, NULL, 0);
1397                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1398         }
1399
1400         if (!system_get_neigh4locktime(dev, buf, sizeof(buf))) {
1401                 s->neigh4locktime = strtol(buf, NULL, 0);
1402                 s->flags |= DEV_OPT_NEIGHLOCKTIME;
1403         }
1404
1405         if (!system_get_neigh4gcstaletime(dev, buf, sizeof(buf))) {
1406                 s->neigh4gcstaletime = strtoul(buf, NULL, 0);
1407                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
1408         }
1409
1410         if (!system_get_neigh6gcstaletime(dev, buf, sizeof(buf))) {
1411                 s->neigh6gcstaletime = strtoul(buf, NULL, 0);
1412                 s->flags |= DEV_OPT_NEIGHGCSTALETIME;
1413         }
1414
1415         if (!system_get_dadtransmits(dev, buf, sizeof(buf))) {
1416                 s->dadtransmits = strtoul(buf, NULL, 0);
1417                 s->flags |= DEV_OPT_DADTRANSMITS;
1418         }
1419
1420         if (!system_get_sendredirects(dev, buf, sizeof(buf))) {
1421                 s->sendredirects = strtoul(buf, NULL, 0);
1422                 s->flags |= DEV_OPT_SENDREDIRECTS;
1423         }
1424 }
1425
1426 void
1427 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
1428 {
1429         struct ifreq ifr;
1430         char buf[12];
1431
1432         memset(&ifr, 0, sizeof(ifr));
1433         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name) - 1);
1434         if (s->flags & DEV_OPT_MTU & apply_mask) {
1435                 ifr.ifr_mtu = s->mtu;
1436                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
1437                         s->flags &= ~DEV_OPT_MTU;
1438         }
1439         if (s->flags & DEV_OPT_MTU6 & apply_mask) {
1440                 system_update_ipv6_mtu(dev, s->mtu6);
1441         }
1442         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
1443                 ifr.ifr_qlen = s->txqueuelen;
1444                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
1445                         s->flags &= ~DEV_OPT_TXQUEUELEN;
1446         }
1447         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
1448                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
1449                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
1450                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
1451                         s->flags &= ~DEV_OPT_MACADDR;
1452         }
1453         if (s->flags & DEV_OPT_IPV6 & apply_mask)
1454                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
1455         if (s->flags & DEV_OPT_PROMISC & apply_mask) {
1456                 if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
1457                                     !s->promisc ? IFF_PROMISC : 0) < 0)
1458                         s->flags &= ~DEV_OPT_PROMISC;
1459         }
1460         if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
1461                 snprintf(buf, sizeof(buf), "%u", s->rpfilter);
1462                 system_set_rpfilter(dev, buf);
1463         }
1464         if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
1465                 system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
1466         if (s->flags & DEV_OPT_IGMPVERSION & apply_mask) {
1467                 snprintf(buf, sizeof(buf), "%u", s->igmpversion);
1468                 system_set_igmpversion(dev, buf);
1469         }
1470         if (s->flags & DEV_OPT_MLDVERSION & apply_mask) {
1471                 snprintf(buf, sizeof(buf), "%u", s->mldversion);
1472                 system_set_mldversion(dev, buf);
1473         }
1474         if (s->flags & DEV_OPT_NEIGHREACHABLETIME & apply_mask) {
1475                 snprintf(buf, sizeof(buf), "%u", s->neigh4reachabletime);
1476                 system_set_neigh4reachabletime(dev, buf);
1477                 snprintf(buf, sizeof(buf), "%u", s->neigh6reachabletime);
1478                 system_set_neigh6reachabletime(dev, buf);
1479         }
1480         if (s->flags & DEV_OPT_NEIGHLOCKTIME & apply_mask) {
1481                 snprintf(buf, sizeof(buf), "%d", s->neigh4locktime);
1482                 system_set_neigh4locktime(dev, buf);
1483         }
1484         if (s->flags & DEV_OPT_NEIGHGCSTALETIME & apply_mask) {
1485                 snprintf(buf, sizeof(buf), "%u", s->neigh4gcstaletime);
1486                 system_set_neigh4gcstaletime(dev, buf);
1487                 snprintf(buf, sizeof(buf), "%u", s->neigh6gcstaletime);
1488                 system_set_neigh6gcstaletime(dev, buf);
1489         }
1490         if (s->flags & DEV_OPT_DADTRANSMITS & apply_mask) {
1491                 snprintf(buf, sizeof(buf), "%u", s->dadtransmits);
1492                 system_set_dadtransmits(dev, buf);
1493         }
1494         if (s->flags & DEV_OPT_MULTICAST & apply_mask) {
1495                 if (system_if_flags(dev->ifname, s->multicast ? IFF_MULTICAST : 0,
1496                                     !s->multicast ? IFF_MULTICAST : 0) < 0)
1497                         s->flags &= ~DEV_OPT_MULTICAST;
1498         }
1499         if (s->flags & DEV_OPT_SENDREDIRECTS & apply_mask)
1500                 system_set_sendredirects(dev, s->sendredirects ? "1" : "0");
1501 }
1502
1503 int system_if_up(struct device *dev)
1504 {
1505         system_if_get_settings(dev, &dev->orig_settings);
1506         /* Only keep orig settings based on what needs to be set */
1507         dev->orig_settings.valid_flags = dev->orig_settings.flags;
1508         dev->orig_settings.flags &= dev->settings.flags;
1509         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
1510         return system_if_flags(dev->ifname, IFF_UP, 0);
1511 }
1512
1513 int system_if_down(struct device *dev)
1514 {
1515         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
1516         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
1517         return ret;
1518 }
1519
1520 struct if_check_data {
1521         struct device *dev;
1522         int pending;
1523         int ret;
1524 };
1525
1526 #ifndef IFF_LOWER_UP
1527 #define IFF_LOWER_UP    0x10000
1528 #endif
1529
1530 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1531 {
1532         struct nlmsghdr *nh = nlmsg_hdr(msg);
1533         struct ifinfomsg *ifi = NLMSG_DATA(nh);
1534         struct if_check_data *chk = (struct if_check_data *)arg;
1535
1536         if (nh->nlmsg_type != RTM_NEWLINK)
1537                 return NL_SKIP;
1538
1539         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1540         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1541
1542         return NL_OK;
1543 }
1544
1545 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1546 {
1547         struct if_check_data *chk = (struct if_check_data *)arg;
1548         chk->pending = 0;
1549         return NL_STOP;
1550 }
1551
1552 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1553 {
1554         struct if_check_data *chk = (struct if_check_data *)arg;
1555
1556         device_set_present(chk->dev, false);
1557         device_set_link(chk->dev, false);
1558         chk->pending = err->error;
1559
1560         return NL_STOP;
1561 }
1562
1563 int system_if_check(struct device *dev)
1564 {
1565         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1566         struct nl_msg *msg;
1567         struct ifinfomsg ifi = {
1568                 .ifi_family = AF_UNSPEC,
1569                 .ifi_index = 0,
1570         };
1571         struct if_check_data chk = {
1572                 .dev = dev,
1573                 .pending = 1,
1574         };
1575         int ret = 1;
1576
1577         if (!cb)
1578                 return ret;
1579
1580         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1581         if (!msg)
1582                 goto out;
1583
1584         if (nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1585             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1586                 goto free;
1587
1588         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1589         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1590         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1591
1592         nl_send_auto_complete(sock_rtnl, msg);
1593         while (chk.pending > 0)
1594                 nl_recvmsgs(sock_rtnl, cb);
1595
1596         ret = chk.pending;
1597
1598 free:
1599         nlmsg_free(msg);
1600 out:
1601         nl_cb_put(cb);
1602         return ret;
1603 }
1604
1605 struct device *
1606 system_if_get_parent(struct device *dev)
1607 {
1608         char buf[64], *devname;
1609         int ifindex, iflink, len;
1610         FILE *f;
1611
1612         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1613         f = fopen(buf, "r");
1614         if (!f)
1615                 return NULL;
1616
1617         len = fread(buf, 1, sizeof(buf) - 1, f);
1618         fclose(f);
1619
1620         if (len <= 0)
1621                 return NULL;
1622
1623         buf[len] = 0;
1624         iflink = strtoul(buf, NULL, 0);
1625         ifindex = system_if_resolve(dev);
1626         if (!iflink || iflink == ifindex)
1627                 return NULL;
1628
1629         devname = if_indextoname(iflink, buf);
1630         if (!devname)
1631                 return NULL;
1632
1633         return device_get(devname, true);
1634 }
1635
1636 static bool
1637 read_string_file(int dir_fd, const char *file, char *buf, int len)
1638 {
1639         bool ret = false;
1640         char *c;
1641         int fd;
1642
1643         fd = openat(dir_fd, file, O_RDONLY);
1644         if (fd < 0)
1645                 return false;
1646
1647 retry:
1648         len = read(fd, buf, len - 1);
1649         if (len < 0) {
1650                 if (errno == EINTR)
1651                         goto retry;
1652         } else if (len > 0) {
1653                         buf[len] = 0;
1654
1655                         c = strchr(buf, '\n');
1656                         if (c)
1657                                 *c = 0;
1658
1659                         ret = true;
1660         }
1661
1662         close(fd);
1663
1664         return ret;
1665 }
1666
1667 static bool
1668 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1669 {
1670         char buf[64];
1671         bool ret = false;
1672
1673         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1674         if (ret)
1675                 *val = strtoull(buf, NULL, 0);
1676
1677         return ret;
1678 }
1679
1680 /* Assume advertised flags == supported flags */
1681 static const struct {
1682         uint32_t mask;
1683         const char *name;
1684 } ethtool_link_modes[] = {
1685         { ADVERTISED_10baseT_Half, "10H" },
1686         { ADVERTISED_10baseT_Full, "10F" },
1687         { ADVERTISED_100baseT_Half, "100H" },
1688         { ADVERTISED_100baseT_Full, "100F" },
1689         { ADVERTISED_1000baseT_Half, "1000H" },
1690         { ADVERTISED_1000baseT_Full, "1000F" },
1691 };
1692
1693 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1694 {
1695         int i;
1696         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1697                 if (mask & ethtool_link_modes[i].mask)
1698                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1699         }
1700 }
1701
1702 bool
1703 system_if_force_external(const char *ifname)
1704 {
1705         char buf[64];
1706         struct stat s;
1707
1708         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1709         return stat(buf, &s) == 0;
1710 }
1711
1712 int
1713 system_if_dump_info(struct device *dev, struct blob_buf *b)
1714 {
1715         struct ethtool_cmd ecmd;
1716         struct ifreq ifr;
1717         char *s;
1718         void *c;
1719
1720         memset(&ecmd, 0, sizeof(ecmd));
1721         memset(&ifr, 0, sizeof(ifr));
1722         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name) - 1);
1723         ifr.ifr_data = (caddr_t) &ecmd;
1724         ecmd.cmd = ETHTOOL_GSET;
1725
1726         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1727                 c = blobmsg_open_array(b, "link-advertising");
1728                 system_add_link_modes(b, ecmd.advertising);
1729                 blobmsg_close_array(b, c);
1730
1731                 c = blobmsg_open_array(b, "link-supported");
1732                 system_add_link_modes(b, ecmd.supported);
1733                 blobmsg_close_array(b, c);
1734
1735                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1736                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1737                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1738                 blobmsg_add_string_buffer(b);
1739         }
1740
1741         return 0;
1742 }
1743
1744 int
1745 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1746 {
1747         const char *const counters[] = {
1748                 "collisions",     "rx_frame_errors",   "tx_compressed",
1749                 "multicast",      "rx_length_errors",  "tx_dropped",
1750                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1751                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1752                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1753                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1754                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1755                 "rx_fifo_errors", "tx_carrier_errors",
1756         };
1757         char buf[64];
1758         int stats_dir;
1759         int i;
1760         uint64_t val = 0;
1761
1762         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1763         stats_dir = open(buf, O_DIRECTORY);
1764         if (stats_dir < 0)
1765                 return -1;
1766
1767         for (i = 0; i < ARRAY_SIZE(counters); i++)
1768                 if (read_uint64_file(stats_dir, counters[i], &val))
1769                         blobmsg_add_u64(b, counters[i], val);
1770
1771         close(stats_dir);
1772         return 0;
1773 }
1774
1775 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1776 {
1777         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1778         int alen = v4 ? 4 : 16;
1779         unsigned int flags = 0;
1780         struct ifaddrmsg ifa = {
1781                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1782                 .ifa_prefixlen = addr->mask,
1783                 .ifa_index = dev->ifindex,
1784         };
1785
1786         struct nl_msg *msg;
1787         if (cmd == RTM_NEWADDR)
1788                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1789
1790         msg = nlmsg_alloc_simple(cmd, flags);
1791         if (!msg)
1792                 return -1;
1793
1794         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1795         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1796         if (v4) {
1797                 if (addr->broadcast)
1798                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1799                 if (addr->point_to_point)
1800                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1801         } else {
1802                 time_t now = system_get_rtime();
1803                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1804
1805                 if (addr->preferred_until) {
1806                         int64_t preferred = addr->preferred_until - now;
1807                         if (preferred < 0)
1808                                 preferred = 0;
1809                         else if (preferred > UINT32_MAX)
1810                                 preferred = UINT32_MAX;
1811
1812                         cinfo.ifa_prefered = preferred;
1813                 }
1814
1815                 if (addr->valid_until) {
1816                         int64_t valid = addr->valid_until - now;
1817                         if (valid <= 0) {
1818                                 nlmsg_free(msg);
1819                                 return -1;
1820                         }
1821                         else if (valid > UINT32_MAX)
1822                                 valid = UINT32_MAX;
1823
1824                         cinfo.ifa_valid = valid;
1825                 }
1826
1827                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1828
1829                 if (cmd == RTM_NEWADDR && (addr->flags & DEVADDR_OFFLINK))
1830                         nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
1831         }
1832
1833         return system_rtnl_call(msg);
1834 }
1835
1836 int system_add_address(struct device *dev, struct device_addr *addr)
1837 {
1838         return system_addr(dev, addr, RTM_NEWADDR);
1839 }
1840
1841 int system_del_address(struct device *dev, struct device_addr *addr)
1842 {
1843         return system_addr(dev, addr, RTM_DELADDR);
1844 }
1845
1846 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1847 {
1848         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1849         bool have_gw;
1850         unsigned int flags = 0;
1851
1852         if (alen == 4)
1853                 have_gw = !!route->nexthop.in.s_addr;
1854         else
1855                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1856                         route->nexthop.in6.s6_addr32[1] ||
1857                         route->nexthop.in6.s6_addr32[2] ||
1858                         route->nexthop.in6.s6_addr32[3];
1859
1860         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1861                         ? route->table : RT_TABLE_MAIN;
1862
1863         struct rtmsg rtm = {
1864                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1865                 .rtm_dst_len = route->mask,
1866                 .rtm_src_len = route->sourcemask,
1867                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1868                 .rtm_protocol = (route->flags & DEVROUTE_PROTO) ? route->proto : RTPROT_STATIC,
1869                 .rtm_scope = RT_SCOPE_NOWHERE,
1870                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1871                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1872         };
1873         struct nl_msg *msg;
1874
1875         if (cmd == RTM_NEWROUTE) {
1876                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1877
1878                 if (!dev) { // Add null-route
1879                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1880                         rtm.rtm_type = RTN_UNREACHABLE;
1881                 }
1882                 else
1883                         rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1884         }
1885
1886         if (route->flags & DEVROUTE_TYPE) {
1887                 rtm.rtm_type = route->type;
1888                 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1889                         if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1890                             rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1891                                 rtm.rtm_table = RT_TABLE_LOCAL;
1892                 }
1893
1894                 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT) {
1895                         rtm.rtm_scope = RT_SCOPE_HOST;
1896                 } else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1897                                 rtm.rtm_type == RTN_ANYCAST) {
1898                         rtm.rtm_scope = RT_SCOPE_LINK;
1899                 } else if (rtm.rtm_type == RTN_BLACKHOLE || rtm.rtm_type == RTN_UNREACHABLE ||
1900                                 rtm.rtm_type == RTN_PROHIBIT || rtm.rtm_type == RTN_FAILED_POLICY ||
1901                                 rtm.rtm_type == RTN_THROW) {
1902                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1903                         dev = NULL;
1904                 }
1905         }
1906
1907         msg = nlmsg_alloc_simple(cmd, flags);
1908         if (!msg)
1909                 return -1;
1910
1911         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1912
1913         if (route->mask)
1914                 nla_put(msg, RTA_DST, alen, &route->addr);
1915
1916         if (route->sourcemask) {
1917                 if (rtm.rtm_family == AF_INET)
1918                         nla_put(msg, RTA_PREFSRC, alen, &route->source);
1919                 else
1920                         nla_put(msg, RTA_SRC, alen, &route->source);
1921         }
1922
1923         if (route->metric > 0)
1924                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1925
1926         if (have_gw)
1927                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1928
1929         if (dev)
1930                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1931
1932         if (table >= 256)
1933                 nla_put_u32(msg, RTA_TABLE, table);
1934
1935         if (route->flags & DEVROUTE_MTU) {
1936                 struct nlattr *metrics;
1937
1938                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1939                         goto nla_put_failure;
1940
1941                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1942
1943                 nla_nest_end(msg, metrics);
1944         }
1945
1946         return system_rtnl_call(msg);
1947
1948 nla_put_failure:
1949         nlmsg_free(msg);
1950         return -ENOMEM;
1951 }
1952
1953 int system_add_route(struct device *dev, struct device_route *route)
1954 {
1955         return system_rt(dev, route, RTM_NEWROUTE);
1956 }
1957
1958 int system_del_route(struct device *dev, struct device_route *route)
1959 {
1960         return system_rt(dev, route, RTM_DELROUTE);
1961 }
1962
1963 int system_flush_routes(void)
1964 {
1965         const char *names[] = {
1966                 "/proc/sys/net/ipv4/route/flush",
1967                 "/proc/sys/net/ipv6/route/flush"
1968         };
1969         int fd, i;
1970
1971         for (i = 0; i < ARRAY_SIZE(names); i++) {
1972                 fd = open(names[i], O_WRONLY);
1973                 if (fd < 0)
1974                         continue;
1975
1976                 if (write(fd, "-1", 2)) {}
1977                 close(fd);
1978         }
1979         return 0;
1980 }
1981
1982 bool system_resolve_rt_type(const char *type, unsigned int *id)
1983 {
1984         return system_rtn_aton(type, id);
1985 }
1986
1987 bool system_resolve_rt_proto(const char *type, unsigned int *id)
1988 {
1989         FILE *f;
1990         char *e, buf[128];
1991         unsigned int n, proto = 256;
1992         n = strtoul(type, &e, 0);
1993         if (!*e && e != type)
1994                 proto = n;
1995         else if (!strcmp(type, "unspec"))
1996                 proto = RTPROT_UNSPEC;
1997         else if (!strcmp(type, "kernel"))
1998                 proto = RTPROT_KERNEL;
1999         else if (!strcmp(type, "boot"))
2000                 proto = RTPROT_BOOT;
2001         else if (!strcmp(type, "static"))
2002                 proto = RTPROT_STATIC;
2003         else if ((f = fopen("/etc/iproute2/rt_protos", "r")) != NULL) {
2004                 while (fgets(buf, sizeof(buf) - 1, f) != NULL) {
2005                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
2006                                 continue;
2007
2008                         n = strtoul(e, NULL, 10);
2009                         e = strtok(NULL, " \t\n");
2010
2011                         if (e && !strcmp(e, type)) {
2012                                 proto = n;
2013                                 break;
2014                         }
2015                 }
2016                 fclose(f);
2017         }
2018
2019         if (proto > 255)
2020                 return false;
2021
2022         *id = proto;
2023         return true;
2024 }
2025
2026 bool system_resolve_rt_table(const char *name, unsigned int *id)
2027 {
2028         FILE *f;
2029         char *e, buf[128];
2030         unsigned int n, table = RT_TABLE_UNSPEC;
2031
2032         /* first try to parse table as number */
2033         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
2034                 table = n;
2035
2036         /* handle well known aliases */
2037         else if (!strcmp(name, "default"))
2038                 table = RT_TABLE_DEFAULT;
2039         else if (!strcmp(name, "main"))
2040                 table = RT_TABLE_MAIN;
2041         else if (!strcmp(name, "local"))
2042                 table = RT_TABLE_LOCAL;
2043
2044         /* try to look up name in /etc/iproute2/rt_tables */
2045         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
2046         {
2047                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
2048                 {
2049                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
2050                                 continue;
2051
2052                         n = strtoul(e, NULL, 10);
2053                         e = strtok(NULL, " \t\n");
2054
2055                         if (e && !strcmp(e, name))
2056                         {
2057                                 table = n;
2058                                 break;
2059                         }
2060                 }
2061
2062                 fclose(f);
2063         }
2064
2065         if (table == RT_TABLE_UNSPEC)
2066                 return false;
2067
2068         *id = table;
2069         return true;
2070 }
2071
2072 bool system_is_default_rt_table(unsigned int id)
2073 {
2074         return (id == RT_TABLE_MAIN);
2075 }
2076
2077 bool system_resolve_rpfilter(const char *filter, unsigned int *id)
2078 {
2079         char *e;
2080         unsigned int n;
2081
2082         if (!strcmp(filter, "strict"))
2083                 n = 1;
2084         else if (!strcmp(filter, "loose"))
2085                 n = 2;
2086         else {
2087                 n = strtoul(filter, &e, 0);
2088                 if (*e || e == filter || n > 2)
2089                         return false;
2090         }
2091
2092         *id = n;
2093         return true;
2094 }
2095
2096 static int system_iprule(struct iprule *rule, int cmd)
2097 {
2098         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
2099
2100         struct nl_msg *msg;
2101         struct rtmsg rtm = {
2102                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
2103                 .rtm_protocol = RTPROT_STATIC,
2104                 .rtm_scope = RT_SCOPE_UNIVERSE,
2105                 .rtm_table = RT_TABLE_UNSPEC,
2106                 .rtm_type = RTN_UNSPEC,
2107                 .rtm_flags = 0,
2108         };
2109
2110         if (cmd == RTM_NEWRULE)
2111                 rtm.rtm_type = RTN_UNICAST;
2112
2113         if (rule->invert)
2114                 rtm.rtm_flags |= FIB_RULE_INVERT;
2115
2116         if (rule->flags & IPRULE_SRC)
2117                 rtm.rtm_src_len = rule->src_mask;
2118
2119         if (rule->flags & IPRULE_DEST)
2120                 rtm.rtm_dst_len = rule->dest_mask;
2121
2122         if (rule->flags & IPRULE_TOS)
2123                 rtm.rtm_tos = rule->tos;
2124
2125         if (rule->flags & IPRULE_LOOKUP) {
2126                 if (rule->lookup < 256)
2127                         rtm.rtm_table = rule->lookup;
2128         }
2129
2130         if (rule->flags & IPRULE_ACTION)
2131                 rtm.rtm_type = rule->action;
2132         else if (rule->flags & IPRULE_GOTO)
2133                 rtm.rtm_type = FR_ACT_GOTO;
2134         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
2135                 rtm.rtm_type = FR_ACT_NOP;
2136
2137         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
2138
2139         if (!msg)
2140                 return -1;
2141
2142         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
2143
2144         if (rule->flags & IPRULE_IN)
2145                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
2146
2147         if (rule->flags & IPRULE_OUT)
2148                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
2149
2150         if (rule->flags & IPRULE_SRC)
2151                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
2152
2153         if (rule->flags & IPRULE_DEST)
2154                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
2155
2156         if (rule->flags & IPRULE_PRIORITY)
2157                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
2158         else if (cmd == RTM_NEWRULE)
2159                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
2160
2161         if (rule->flags & IPRULE_FWMARK)
2162                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
2163
2164         if (rule->flags & IPRULE_FWMASK)
2165                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
2166
2167         if (rule->flags & IPRULE_LOOKUP) {
2168                 if (rule->lookup >= 256)
2169                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
2170         }
2171
2172         if (rule->flags & IPRULE_SUP_PREFIXLEN)
2173                 nla_put_u32(msg, FRA_SUPPRESS_PREFIXLEN, rule->sup_prefixlen);
2174
2175         if (rule->flags & IPRULE_GOTO)
2176                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
2177
2178         return system_rtnl_call(msg);
2179 }
2180
2181 int system_add_iprule(struct iprule *rule)
2182 {
2183         return system_iprule(rule, RTM_NEWRULE);
2184 }
2185
2186 int system_del_iprule(struct iprule *rule)
2187 {
2188         return system_iprule(rule, RTM_DELRULE);
2189 }
2190
2191 int system_flush_iprules(void)
2192 {
2193         int rv = 0;
2194         struct iprule rule;
2195
2196         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
2197         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
2198
2199         memset(&rule, 0, sizeof(rule));
2200
2201
2202         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
2203
2204         rule.priority = 0;
2205         rule.lookup = RT_TABLE_LOCAL;
2206         rv |= system_iprule(&rule, RTM_NEWRULE);
2207
2208         rule.priority = 32766;
2209         rule.lookup = RT_TABLE_MAIN;
2210         rv |= system_iprule(&rule, RTM_NEWRULE);
2211
2212         rule.priority = 32767;
2213         rule.lookup = RT_TABLE_DEFAULT;
2214         rv |= system_iprule(&rule, RTM_NEWRULE);
2215
2216
2217         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
2218
2219         rule.priority = 0;
2220         rule.lookup = RT_TABLE_LOCAL;
2221         rv |= system_iprule(&rule, RTM_NEWRULE);
2222
2223         rule.priority = 32766;
2224         rule.lookup = RT_TABLE_MAIN;
2225         rv |= system_iprule(&rule, RTM_NEWRULE);
2226
2227         return rv;
2228 }
2229
2230 bool system_resolve_iprule_action(const char *action, unsigned int *id)
2231 {
2232         return system_rtn_aton(action, id);
2233 }
2234
2235 time_t system_get_rtime(void)
2236 {
2237         struct timespec ts;
2238         struct timeval tv;
2239
2240         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
2241                 return ts.tv_sec;
2242
2243         if (gettimeofday(&tv, NULL) == 0)
2244                 return tv.tv_sec;
2245
2246         return 0;
2247 }
2248
2249 #ifndef IP_DF
2250 #define IP_DF       0x4000
2251 #endif
2252
2253 static int tunnel_ioctl(const char *name, int cmd, void *p)
2254 {
2255         struct ifreq ifr;
2256
2257         memset(&ifr, 0, sizeof(ifr));
2258         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name) - 1);
2259         ifr.ifr_ifru.ifru_data = p;
2260         return ioctl(sock_ioctl, cmd, &ifr);
2261 }
2262
2263 #ifdef IFLA_IPTUN_MAX
2264 static int system_add_ip6_tunnel(const char *name, const unsigned int link,
2265                                  struct blob_attr **tb)
2266 {
2267         struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
2268                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2269         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
2270         struct blob_attr *cur;
2271         int ret = 0, ttl = 0;
2272
2273         if (!nlm)
2274                 return -1;
2275
2276         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2277         nla_put_string(nlm, IFLA_IFNAME, name);
2278
2279         if (link)
2280                 nla_put_u32(nlm, IFLA_LINK, link);
2281
2282         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2283         if (!linkinfo) {
2284                 ret = -ENOMEM;
2285                 goto failure;
2286         }
2287
2288         nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
2289         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2290         if (!infodata) {
2291                 ret = -ENOMEM;
2292                 goto failure;
2293         }
2294
2295         if (link)
2296                 nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
2297
2298         if ((cur = tb[TUNNEL_ATTR_TTL]))
2299                 ttl = blobmsg_get_u32(cur);
2300
2301         nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
2302         nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
2303         nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
2304
2305         struct in6_addr in6buf;
2306         if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2307                 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2308                         ret = -EINVAL;
2309                         goto failure;
2310                 }
2311                 nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
2312         }
2313
2314         if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2315                 if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2316                         ret = -EINVAL;
2317                         goto failure;
2318                 }
2319                 nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
2320         }
2321
2322 #ifdef IFLA_IPTUN_FMR_MAX
2323         if ((cur = tb[TUNNEL_ATTR_DATA])) {
2324                 struct blob_attr *dcur;
2325                 unsigned drem, fmrcnt = 0;
2326                 struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
2327
2328                 if (!fmrs) {
2329                         ret = -ENOMEM;
2330                         goto failure;
2331                 }
2332
2333                 blobmsg_for_each_attr(dcur, cur, drem) {
2334                         if (blobmsg_type(dcur) != BLOBMSG_TYPE_ARRAY ||
2335                                         strcmp(blobmsg_name(dcur), "fmrs") ||
2336                                         blobmsg_check_array(dcur, BLOBMSG_TYPE_UNSPEC) <= 0)
2337                                 continue;
2338
2339                         struct blob_attr *rcur;
2340                         unsigned rrem;
2341                         blobmsg_for_each_attr(rcur, dcur, rrem) {
2342                                 struct blob_attr *tb_fmr[__FMR_DATA_ATTR_MAX], *tb_cur;
2343                                 struct in6_addr ip6prefix;
2344                                 struct in_addr ip4prefix;
2345                                 unsigned ip4len, ip6len, ealen, offset;
2346
2347                                 blobmsg_parse(fmr_data_attr_list.params, __FMR_DATA_ATTR_MAX, tb_fmr,
2348                                                 blobmsg_data(rcur), blobmsg_len(rcur));
2349
2350                                 if (!(tb_cur = tb_fmr[FMR_DATA_PREFIX6]) ||
2351                                                 !parse_ip_and_netmask(AF_INET6,
2352                                                         blobmsg_data(tb_cur), &ip6prefix,
2353                                                         &ip6len)) {
2354                                         ret = -EINVAL;
2355                                         goto failure;
2356                                 }
2357
2358                                 if (!(tb_cur = tb_fmr[FMR_DATA_PREFIX4]) ||
2359                                                 !parse_ip_and_netmask(AF_INET,
2360                                                         blobmsg_data(tb_cur), &ip4prefix,
2361                                                         &ip4len)) {
2362                                         ret = -EINVAL;
2363                                         goto failure;
2364                                 }
2365
2366                                 if (!(tb_cur = tb_fmr[FMR_DATA_EALEN])) {
2367                                         ret = -EINVAL;
2368                                         goto failure;
2369                                 }
2370                                 ealen = blobmsg_get_u32(tb_cur);
2371
2372                                 if (!(tb_cur = tb_fmr[FMR_DATA_OFFSET])) {
2373                                         ret = -EINVAL;
2374                                         goto failure;
2375                                 }
2376                                 offset = blobmsg_get_u32(tb_cur);
2377
2378                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2379                                 if (!rule) {
2380                                         ret = -ENOMEM;
2381                                         goto failure;
2382                                 }
2383
2384                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2385                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2386                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2387                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2388                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2389                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2390
2391                                 nla_nest_end(nlm, rule);
2392                         }
2393                 }
2394                 nla_nest_end(nlm, fmrs);
2395         }
2396 #endif
2397
2398         nla_nest_end(nlm, infodata);
2399         nla_nest_end(nlm, linkinfo);
2400
2401         return system_rtnl_call(nlm);
2402
2403 failure:
2404         nlmsg_free(nlm);
2405         return ret;
2406 }
2407 #endif
2408
2409 #ifdef IFLA_IPTUN_MAX
2410 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
2411 static int system_add_gre_tunnel(const char *name, const char *kind,
2412                                  const unsigned int link, struct blob_attr **tb, bool v6)
2413 {
2414         struct nl_msg *nlm;
2415         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
2416         struct blob_attr *cur;
2417         uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
2418         uint16_t iflags = 0, oflags = 0;
2419         uint8_t tos = 0;
2420         int ret = 0, ttl = 0;
2421
2422         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2423         if (!nlm)
2424                 return -1;
2425
2426         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2427         nla_put_string(nlm, IFLA_IFNAME, name);
2428
2429         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2430         if (!linkinfo) {
2431                 ret = -ENOMEM;
2432                 goto failure;
2433         }
2434
2435         nla_put_string(nlm, IFLA_INFO_KIND, kind);
2436         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2437         if (!infodata) {
2438                 ret = -ENOMEM;
2439                 goto failure;
2440         }
2441
2442         if (link)
2443                 nla_put_u32(nlm, IFLA_GRE_LINK, link);
2444
2445         if ((cur = tb[TUNNEL_ATTR_TTL]))
2446                 ttl = blobmsg_get_u32(cur);
2447
2448         if ((cur = tb[TUNNEL_ATTR_TOS])) {
2449                 char *str = blobmsg_get_string(cur);
2450                 if (strcmp(str, "inherit")) {
2451                         unsigned uval;
2452
2453                         if (!system_tos_aton(str, &uval)) {
2454                                 ret = -EINVAL;
2455                                 goto failure;
2456                         }
2457
2458                         if (v6)
2459                                 flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
2460                         else
2461                                 tos = uval;
2462                 } else {
2463                         if (v6)
2464                                 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
2465                         else
2466                                 tos = 1;
2467                 }
2468         }
2469
2470         if ((cur = tb[TUNNEL_ATTR_DATA])) {
2471                 struct blob_attr *tb_data[__GRE_DATA_ATTR_MAX];
2472
2473                 blobmsg_parse(gre_data_attr_list.params, __GRE_DATA_ATTR_MAX, tb_data,
2474                         blobmsg_data(cur), blobmsg_len(cur));
2475
2476                 if ((cur = tb_data[GRE_DATA_IKEY])) {
2477                         if ((ikey = blobmsg_get_u32(cur)))
2478                                 iflags |= GRE_KEY;
2479                 }
2480
2481                 if ((cur = tb_data[GRE_DATA_OKEY])) {
2482                         if ((okey = blobmsg_get_u32(cur)))
2483                                 oflags |= GRE_KEY;
2484                 }
2485
2486                 if ((cur = tb_data[GRE_DATA_ICSUM])) {
2487                         if (blobmsg_get_bool(cur))
2488                                 iflags |= GRE_CSUM;
2489                 }
2490
2491                 if ((cur = tb_data[GRE_DATA_OCSUM])) {
2492                         if (blobmsg_get_bool(cur))
2493                                 oflags |= GRE_CSUM;
2494                 }
2495
2496                 if ((cur = tb_data[GRE_DATA_ISEQNO])) {
2497                         if (blobmsg_get_bool(cur))
2498                                 iflags |= GRE_SEQ;
2499                 }
2500
2501                 if ((cur = tb[GRE_DATA_OSEQNO])) {
2502                         if (blobmsg_get_bool(cur))
2503                                 oflags |= GRE_SEQ;
2504                 }
2505         }
2506
2507         if (v6) {
2508                 struct in6_addr in6buf;
2509                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2510                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2511                                 ret = -EINVAL;
2512                                 goto failure;
2513                         }
2514                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
2515                 }
2516
2517                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2518                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2519                                 ret = -EINVAL;
2520                                 goto failure;
2521                         }
2522                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
2523                 }
2524                 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
2525
2526                 if (flowinfo)
2527                         nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
2528
2529                 if (flags)
2530                         nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
2531
2532                 if (!ttl)
2533                         ttl = 64;
2534         } else {
2535                 struct in_addr inbuf;
2536                 bool set_df = true;
2537
2538                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2539                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2540                                 ret = -EINVAL;
2541                                 goto failure;
2542                         }
2543                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
2544                 }
2545
2546                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2547                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2548                                 ret = -EINVAL;
2549                                 goto failure;
2550                         }
2551                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
2552
2553                         if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
2554                                 if (!okey) {
2555                                         okey = inbuf.s_addr;
2556                                         oflags |= GRE_KEY;
2557                                 }
2558
2559                                 if (!ikey) {
2560                                         ikey = inbuf.s_addr;
2561                                         iflags |= GRE_KEY;
2562                                 }
2563                         }
2564                 }
2565
2566                 if ((cur = tb[TUNNEL_ATTR_DF]))
2567                         set_df = blobmsg_get_bool(cur);
2568
2569                 if (!set_df) {
2570                         /* ttl != 0 and nopmtudisc are incompatible */
2571                         if (ttl) {
2572                                 ret = -EINVAL;
2573                                 goto failure;
2574                         }
2575                 } else if (!ttl)
2576                         ttl = 64;
2577
2578                 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
2579
2580                 nla_put_u8(nlm, IFLA_GRE_TOS, tos);
2581         }
2582
2583         if (ttl)
2584                 nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
2585
2586         if (oflags)
2587                 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
2588
2589         if (iflags)
2590                 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
2591
2592         if (okey)
2593                 nla_put_u32(nlm, IFLA_GRE_OKEY, htonl(okey));
2594
2595         if (ikey)
2596                 nla_put_u32(nlm, IFLA_GRE_IKEY, htonl(ikey));
2597
2598         nla_nest_end(nlm, infodata);
2599         nla_nest_end(nlm, linkinfo);
2600
2601         return system_rtnl_call(nlm);
2602
2603 failure:
2604         nlmsg_free(nlm);
2605         return ret;
2606 }
2607 #endif
2608
2609 #ifdef IFLA_VTI_MAX
2610 static int system_add_vti_tunnel(const char *name, const char *kind,
2611                                  const unsigned int link, struct blob_attr **tb, bool v6)
2612 {
2613         struct nl_msg *nlm;
2614         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
2615         struct blob_attr *cur;
2616         int ret = 0;
2617
2618         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2619         if (!nlm)
2620                 return -1;
2621
2622         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2623         nla_put_string(nlm, IFLA_IFNAME, name);
2624
2625         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2626         if (!linkinfo) {
2627                 ret = -ENOMEM;
2628                 goto failure;
2629         }
2630
2631         nla_put_string(nlm, IFLA_INFO_KIND, kind);
2632         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2633         if (!infodata) {
2634                 ret = -ENOMEM;
2635                 goto failure;
2636         }
2637
2638         if (link)
2639                 nla_put_u32(nlm, IFLA_VTI_LINK, link);
2640
2641         if (v6) {
2642                 struct in6_addr in6buf;
2643                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2644                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2645                                 ret = -EINVAL;
2646                                 goto failure;
2647                         }
2648                         nla_put(nlm, IFLA_VTI_LOCAL, sizeof(in6buf), &in6buf);
2649                 }
2650
2651                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2652                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2653                                 ret = -EINVAL;
2654                                 goto failure;
2655                         }
2656                         nla_put(nlm, IFLA_VTI_REMOTE, sizeof(in6buf), &in6buf);
2657                 }
2658
2659         } else {
2660                 struct in_addr inbuf;
2661
2662                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2663                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2664                                 ret = -EINVAL;
2665                                 goto failure;
2666                         }
2667                         nla_put(nlm, IFLA_VTI_LOCAL, sizeof(inbuf), &inbuf);
2668                 }
2669
2670                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2671                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2672                                 ret = -EINVAL;
2673                                 goto failure;
2674                         }
2675                         nla_put(nlm, IFLA_VTI_REMOTE, sizeof(inbuf), &inbuf);
2676                 }
2677
2678         }
2679
2680         if ((cur = tb[TUNNEL_ATTR_DATA])) {
2681                 struct blob_attr *tb_data[__VTI_DATA_ATTR_MAX];
2682                 uint32_t ikey = 0, okey = 0;
2683
2684                 blobmsg_parse(vti_data_attr_list.params, __VTI_DATA_ATTR_MAX, tb_data,
2685                         blobmsg_data(cur), blobmsg_len(cur));
2686
2687                 if ((cur = tb_data[VTI_DATA_IKEY])) {
2688                         if ((ikey = blobmsg_get_u32(cur)))
2689                                 nla_put_u32(nlm, IFLA_VTI_IKEY, htonl(ikey));
2690                 }
2691
2692                 if ((cur = tb_data[VTI_DATA_OKEY])) {
2693                         if ((okey = blobmsg_get_u32(cur)))
2694                                 nla_put_u32(nlm, IFLA_VTI_OKEY, htonl(okey));
2695                 }
2696         }
2697
2698         nla_nest_end(nlm, infodata);
2699         nla_nest_end(nlm, linkinfo);
2700
2701         return system_rtnl_call(nlm);
2702
2703 failure:
2704         nlmsg_free(nlm);
2705         return ret;
2706 }
2707 #endif
2708
2709 #ifdef IFLA_VXLAN_MAX
2710 static int system_add_vxlan(const char *name, const unsigned int link, struct blob_attr **tb, bool v6)
2711 {
2712         struct blob_attr *tb_data[__VXLAN_DATA_ATTR_MAX];
2713         struct nl_msg *msg;
2714         struct nlattr *linkinfo, *data;
2715         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
2716         struct blob_attr *cur;
2717         int ret = 0;
2718
2719         if ((cur = tb[TUNNEL_ATTR_DATA]))
2720                 blobmsg_parse(vxlan_data_attr_list.params, __VXLAN_DATA_ATTR_MAX, tb_data,
2721                         blobmsg_data(cur), blobmsg_len(cur));
2722         else
2723                 return -EINVAL;
2724
2725         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
2726
2727         if (!msg)
2728                 return -1;
2729
2730         nlmsg_append(msg, &iim, sizeof(iim), 0);
2731
2732         nla_put_string(msg, IFLA_IFNAME, name);
2733
2734         if ((cur = tb_data[VXLAN_DATA_ATTR_MACADDR])) {
2735                 struct ether_addr *ea = ether_aton(blobmsg_get_string(cur));
2736                 if (!ea) {
2737                         ret = -EINVAL;
2738                         goto failure;
2739                 }
2740
2741                 nla_put(msg, IFLA_ADDRESS, ETH_ALEN, ea);
2742         }
2743
2744         if ((cur = tb[TUNNEL_ATTR_MTU])) {
2745                 uint32_t mtu = blobmsg_get_u32(cur);
2746                 nla_put_u32(msg, IFLA_MTU, mtu);
2747         }
2748
2749         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO))) {
2750                 ret = -ENOMEM;
2751                 goto failure;
2752         }
2753
2754         nla_put_string(msg, IFLA_INFO_KIND, "vxlan");
2755
2756         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA))) {
2757                 ret = -ENOMEM;
2758                 goto failure;
2759         }
2760
2761         if (link)
2762                 nla_put_u32(msg, IFLA_VXLAN_LINK, link);
2763
2764         if ((cur = tb_data[VXLAN_DATA_ATTR_ID])) {
2765                 uint32_t id = blobmsg_get_u32(cur);
2766                 if (id >= (1u << 24) - 1) {
2767                         ret = -EINVAL;
2768                         goto failure;
2769                 }
2770
2771                 nla_put_u32(msg, IFLA_VXLAN_ID, id);
2772         }
2773
2774         if (v6) {
2775                 struct in6_addr in6buf;
2776                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2777                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2778                                 ret = -EINVAL;
2779                                 goto failure;
2780                         }
2781                         nla_put(msg, IFLA_VXLAN_LOCAL6, sizeof(in6buf), &in6buf);
2782                 }
2783
2784                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2785                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2786                                 ret = -EINVAL;
2787                                 goto failure;
2788                         }
2789                         nla_put(msg, IFLA_VXLAN_GROUP6, sizeof(in6buf), &in6buf);
2790                 }
2791         } else {
2792                 struct in_addr inbuf;
2793
2794                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2795                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2796                                 ret = -EINVAL;
2797                                 goto failure;
2798                         }
2799                         nla_put(msg, IFLA_VXLAN_LOCAL, sizeof(inbuf), &inbuf);
2800                 }
2801
2802                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2803                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2804                                 ret = -EINVAL;
2805                                 goto failure;
2806                         }
2807                         nla_put(msg, IFLA_VXLAN_GROUP, sizeof(inbuf), &inbuf);
2808                 }
2809         }
2810
2811         uint32_t port = 4789;
2812         if ((cur = tb_data[VXLAN_DATA_ATTR_PORT])) {
2813                 port = blobmsg_get_u32(cur);
2814                 if (port < 1 || port > 65535) {
2815                         ret = -EINVAL;
2816                         goto failure;
2817                 }
2818         }
2819         nla_put_u16(msg, IFLA_VXLAN_PORT, htons(port));
2820
2821         if ((cur = tb_data[VXLAN_DATA_ATTR_RXCSUM])) {
2822                 bool rxcsum = blobmsg_get_bool(cur);
2823                 nla_put_u8(msg, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, !rxcsum);
2824         }
2825
2826         if ((cur = tb_data[VXLAN_DATA_ATTR_TXCSUM])) {
2827                 bool txcsum = blobmsg_get_bool(cur);
2828                 nla_put_u8(msg, IFLA_VXLAN_UDP_CSUM, txcsum);
2829                 nla_put_u8(msg, IFLA_VXLAN_UDP_ZERO_CSUM6_TX, !txcsum);
2830         }
2831
2832         if ((cur = tb[TUNNEL_ATTR_TOS])) {
2833                 char *str = blobmsg_get_string(cur);
2834                 unsigned tos = 1;
2835
2836                 if (strcmp(str, "inherit")) {
2837                         if (!system_tos_aton(str, &tos)) {
2838                                 ret = -EINVAL;
2839                                 goto failure;
2840                         }
2841                 }
2842
2843                 nla_put_u8(msg, IFLA_VXLAN_TOS, tos);
2844         }
2845
2846         if ((cur = tb[TUNNEL_ATTR_TTL])) {
2847                 uint32_t ttl = blobmsg_get_u32(cur);
2848                 if (ttl < 1 || ttl > 255) {
2849                         ret = -EINVAL;
2850                         goto failure;
2851                 }
2852
2853                 nla_put_u8(msg, IFLA_VXLAN_TTL, ttl);
2854         }
2855
2856         nla_nest_end(msg, data);
2857         nla_nest_end(msg, linkinfo);
2858
2859         ret = system_rtnl_call(msg);
2860         if (ret)
2861                 D(SYSTEM, "Error adding vxlan '%s': %d\n", name, ret);
2862
2863         return ret;
2864
2865 failure:
2866         nlmsg_free(msg);
2867         return ret;
2868 }
2869 #endif
2870
2871 static int system_add_sit_tunnel(const char *name, const unsigned int link, struct blob_attr **tb)
2872 {
2873         struct blob_attr *cur;
2874         int ret = 0;
2875
2876         if (system_add_proto_tunnel(name, IPPROTO_IPV6, link, tb) < 0)
2877                 return -1;
2878
2879 #ifdef SIOCADD6RD
2880         if ((cur = tb[TUNNEL_ATTR_DATA])) {
2881                 struct blob_attr *tb_data[__SIXRD_DATA_ATTR_MAX];
2882                 unsigned int mask;
2883                 struct ip_tunnel_6rd p6;
2884
2885                 blobmsg_parse(sixrd_data_attr_list.params, __SIXRD_DATA_ATTR_MAX, tb_data,
2886                         blobmsg_data(cur), blobmsg_len(cur));
2887
2888                 memset(&p6, 0, sizeof(p6));
2889
2890                 if ((cur = tb_data[SIXRD_DATA_PREFIX])) {
2891                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
2892                                                 &p6.prefix, &mask) || mask > 128) {
2893                                 ret = -EINVAL;
2894                                 goto failure;
2895                         }
2896
2897                         p6.prefixlen = mask;
2898                 }
2899
2900                 if ((cur = tb_data[SIXRD_DATA_RELAY_PREFIX])) {
2901                         if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
2902                                                 &p6.relay_prefix, &mask) || mask > 32) {
2903                                 ret = -EINVAL;
2904                                 goto failure;
2905                         }
2906
2907                         p6.relay_prefixlen = mask;
2908                 }
2909
2910                 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
2911                         ret = -1;
2912                         goto failure;
2913                 }
2914         }
2915 #endif
2916
2917         return ret;
2918
2919 failure:
2920         __system_del_ip_tunnel(name, tb);
2921         return ret;
2922 }
2923
2924 static int system_add_proto_tunnel(const char *name, const uint8_t proto, const unsigned int link, struct blob_attr **tb)
2925 {
2926         struct blob_attr *cur;
2927         bool set_df = true;
2928         struct ip_tunnel_parm p  = {
2929                 .link = link,
2930                 .iph = {
2931                         .version = 4,
2932                         .ihl = 5,
2933                         .protocol = proto,
2934                 }
2935         };
2936
2937         if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
2938                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
2939                 return -EINVAL;
2940
2941         if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
2942                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
2943                 return -EINVAL;
2944
2945         if ((cur = tb[TUNNEL_ATTR_DF]))
2946                 set_df = blobmsg_get_bool(cur);
2947
2948         if ((cur = tb[TUNNEL_ATTR_TTL]))
2949                 p.iph.ttl = blobmsg_get_u32(cur);
2950
2951         if ((cur = tb[TUNNEL_ATTR_TOS])) {
2952                 char *str = blobmsg_get_string(cur);
2953                 if (strcmp(str, "inherit")) {
2954                         unsigned uval;
2955
2956                         if (!system_tos_aton(str, &uval))
2957                                 return -EINVAL;
2958
2959                         p.iph.tos = uval;
2960                 } else
2961                         p.iph.tos = 1;
2962         }
2963
2964         p.iph.frag_off = set_df ? htons(IP_DF) : 0;
2965         /* ttl !=0 and nopmtudisc are incompatible */
2966         if (p.iph.ttl && p.iph.frag_off == 0)
2967                 return -EINVAL;
2968
2969         strncpy(p.name, name, sizeof(p.name) - 1);
2970
2971         switch (p.iph.protocol) {
2972         case IPPROTO_IPIP:
2973                 return tunnel_ioctl("tunl0", SIOCADDTUNNEL, &p);
2974         case IPPROTO_IPV6:
2975                 return tunnel_ioctl("sit0", SIOCADDTUNNEL, &p);
2976         default:
2977                 break;
2978         }
2979         return -1;
2980 }
2981
2982 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
2983 {
2984         struct blob_attr *cur;
2985         const char *str;
2986
2987         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2988                 return -EINVAL;
2989         str = blobmsg_data(cur);
2990
2991         if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
2992             !strcmp(str, "greip6") || !strcmp(str, "gretapip6") ||
2993             !strcmp(str, "vtiip") || !strcmp(str, "vtiip6") ||
2994             !strcmp(str, "vxlan") || !strcmp(str, "vxlan6"))
2995                 return system_link_del(name);
2996         else
2997                 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
2998 }
2999
3000 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
3001 {
3002         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
3003
3004         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
3005                 blob_data(attr), blob_len(attr));
3006
3007         return __system_del_ip_tunnel(name, tb);
3008 }
3009
3010 int system_update_ipv6_mtu(struct device *dev, int mtu)
3011 {
3012         int ret = -1;
3013         char buf[64];
3014         int fd;
3015
3016         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
3017                         dev->ifname);
3018
3019         fd = open(buf, O_RDWR);
3020         if (fd < 0)
3021                 return ret;
3022
3023         if (!mtu) {
3024                 ssize_t len = read(fd, buf, sizeof(buf) - 1);
3025                 if (len < 0)
3026                         goto out;
3027
3028                 buf[len] = 0;
3029                 ret = atoi(buf);
3030         } else {
3031                 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) > 0)
3032                         ret = mtu;
3033         }
3034
3035 out:
3036         close(fd);
3037         return ret;
3038 }
3039
3040 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
3041 {
3042         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
3043         struct blob_attr *cur;
3044         const char *str;
3045
3046         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
3047                 blob_data(attr), blob_len(attr));
3048
3049         __system_del_ip_tunnel(name, tb);
3050
3051         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
3052                 return -EINVAL;
3053         str = blobmsg_data(cur);
3054
3055         unsigned int ttl = 0;
3056         if ((cur = tb[TUNNEL_ATTR_TTL])) {
3057                 ttl = blobmsg_get_u32(cur);
3058                 if (ttl > 255)
3059                         return -EINVAL;
3060         }
3061
3062         unsigned int link = 0;
3063         if ((cur = tb[TUNNEL_ATTR_LINK])) {
3064                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
3065                 if (!iface)
3066                         return -EINVAL;
3067
3068                 if (iface->l3_dev.dev)
3069                         link = iface->l3_dev.dev->ifindex;
3070         }
3071
3072         if (!strcmp(str, "sit"))
3073                 return system_add_sit_tunnel(name, link, tb);
3074 #ifdef IFLA_IPTUN_MAX
3075         else if (!strcmp(str, "ipip6")) {
3076                 return system_add_ip6_tunnel(name, link, tb);
3077         } else if (!strcmp(str, "greip")) {
3078                 return system_add_gre_tunnel(name, "gre", link, tb, false);
3079         } else if (!strcmp(str, "gretapip"))  {
3080                 return system_add_gre_tunnel(name, "gretap", link, tb, false);
3081         } else if (!strcmp(str, "greip6")) {
3082                 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
3083         } else if (!strcmp(str, "gretapip6")) {
3084                 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
3085 #ifdef IFLA_VTI_MAX
3086         } else if (!strcmp(str, "vtiip")) {
3087                 return system_add_vti_tunnel(name, "vti", link, tb, false);
3088         } else if (!strcmp(str, "vtiip6")) {
3089                 return system_add_vti_tunnel(name, "vti6", link, tb, true);
3090 #endif
3091 #ifdef IFLA_VXLAN_MAX
3092         } else if(!strcmp(str, "vxlan")) {
3093                 return system_add_vxlan(name, link, tb, false);
3094         } else if(!strcmp(str, "vxlan6")) {
3095                 return system_add_vxlan(name, link, tb, true);
3096 #endif
3097 #endif
3098         } else if (!strcmp(str, "ipip")) {
3099                 return system_add_proto_tunnel(name, IPPROTO_IPIP, link, tb);
3100         }
3101         else
3102                 return -EINVAL;
3103
3104         return 0;
3105 }