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  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17 #define _GNU_SOURCE
  18
  19 #include <sys/socket.h>
  20 #include <sys/ioctl.h>
  21 #include <sys/stat.h>
  22 #include <sys/syscall.h>
  23
  24 #include <net/if.h>
  25 #include <net/if_arp.h>
  26
  27 #include <arpa/inet.h>
  28 #include <netinet/in.h>
  29
  30 #include <linux/rtnetlink.h>
  31 #include <linux/sockios.h>
  32 #include <linux/ip.h>
  33 #include <linux/if_link.h>
  34 #include <linux/if_vlan.h>
  35 #include <linux/if_bridge.h>
  36 #include <linux/if_tunnel.h>
  37 #include <linux/ip6_tunnel.h>
  38 #include <linux/ethtool.h>
  39 #include <linux/fib_rules.h>
  40 #include <linux/version.h>
  41
  42 #ifndef RTN_FAILED_POLICY
  43 #define RTN_FAILED_POLICY 12
  44 #endif
  45
  46 #include <string.h>
  47 #include <fcntl.h>
  48 #include <glob.h>
  49 #include <time.h>
  50
  51 #include <netlink/msg.h>
  52 #include <netlink/attr.h>
  53 #include <netlink/socket.h>
  54 #include <libubox/uloop.h>
  55
  56 #include "netifd.h"
  57 #include "device.h"
  58 #include "system.h"
  59
  60 struct event_socket {
  61         struct uloop_fd uloop;
  62         struct nl_sock *sock;
  63         int bufsize;
  64 };
  65
  66 static int sock_ioctl = -1;
  67 static struct nl_sock *sock_rtnl = NULL;
  68
  69 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  70 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  71
  72 static char dev_buf[256];
  73
  74 static void
  75 handler_nl_event(struct uloop_fd *u, unsigned int events)
  76 {
  77         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  78         int err;
  79         socklen_t errlen = sizeof(err);
  80
  81         if (!u->error) {
  82                 nl_recvmsgs_default(ev->sock);
  83                 return;
  84         }
  85
  86         if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
  87                 goto abort;
  88
  89         switch(err) {
  90         case ENOBUFS:
  91                 // Increase rx buffer size on netlink socket
  92                 ev->bufsize *= 2;
  93                 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
  94                         goto abort;
  95
  96                 // Request full dump since some info got dropped
  97                 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
  98                 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
  99                 break;
 100
 101         default:
 102                 goto abort;
 103         }
 104         u->error = false;
 105         return;
 106
 107 abort:
 108         uloop_fd_delete(&ev->uloop);
 109         return;
 110 }
 111
 112 static struct nl_sock *
 113 create_socket(int protocol, int groups)
 114 {
 115         struct nl_sock *sock;
 116
 117         sock = nl_socket_alloc();
 118         if (!sock)
 119                 return NULL;
 120
 121         if (groups)
 122                 nl_join_groups(sock, groups);
 123
 124         if (nl_connect(sock, protocol))
 125                 return NULL;
 126
 127         return sock;
 128 }
 129
 130 static bool
 131 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
 132                         uloop_fd_handler cb, int flags)
 133 {
 134         ev->sock = create_socket(protocol, groups);
 135         if (!ev->sock)
 136                 return false;
 137
 138         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 139         ev->uloop.cb = cb;
 140         if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
 141                 return false;
 142
 143         return true;
 144 }
 145
 146 static bool
 147 create_event_socket(struct event_socket *ev, int protocol,
 148                     int (*cb)(struct nl_msg *msg, void *arg))
 149 {
 150         if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
 151                 return false;
 152
 153         // Install the valid custom callback handler
 154         nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 155
 156         // Disable sequence number checking on event sockets
 157         nl_socket_disable_seq_check(ev->sock);
 158
 159         // Increase rx buffer size to 65K on event sockets
 160         ev->bufsize = 65535;
 161         if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 162                 return false;
 163
 164         return true;
 165 }
 166
 167 static bool
 168 system_rtn_aton(const char *src, unsigned int *dst)
 169 {
 170         char *e;
 171         unsigned int n;
 172
 173         if (!strcmp(src, "local"))
 174                 n = RTN_LOCAL;
 175         else if (!strcmp(src, "nat"))
 176                 n = RTN_NAT;
 177         else if (!strcmp(src, "broadcast"))
 178                 n = RTN_BROADCAST;
 179         else if (!strcmp(src, "anycast"))
 180                 n = RTN_ANYCAST;
 181         else if (!strcmp(src, "multicast"))
 182                 n = RTN_MULTICAST;
 183         else if (!strcmp(src, "prohibit"))
 184                 n = RTN_PROHIBIT;
 185         else if (!strcmp(src, "unreachable"))
 186                 n = RTN_UNREACHABLE;
 187         else if (!strcmp(src, "blackhole"))
 188                 n = RTN_BLACKHOLE;
 189         else if (!strcmp(src, "xresolve"))
 190                 n = RTN_XRESOLVE;
 191         else if (!strcmp(src, "unicast"))
 192                 n = RTN_UNICAST;
 193         else if (!strcmp(src, "throw"))
 194                 n = RTN_THROW;
 195         else if (!strcmp(src, "failed_policy"))
 196                 n = RTN_FAILED_POLICY;
 197         else {
 198                 n = strtoul(src, &e, 0);
 199                 if (!e || *e || e == src || n > 255)
 200                         return false;
 201         }
 202
 203         *dst = n;
 204         return true;
 205 }
 206
 207 int system_init(void)
 208 {
 209         static struct event_socket rtnl_event;
 210         static struct event_socket hotplug_event;
 211
 212         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 213         system_fd_set_cloexec(sock_ioctl);
 214
 215         // Prepare socket for routing / address control
 216         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 217         if (!sock_rtnl)
 218                 return -1;
 219
 220         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 221                 return -1;
 222
 223         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 224                                      handle_hotplug_event, 0))
 225                 return -1;
 226
 227         // Receive network link events form kernel
 228         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 229
 230         return 0;
 231 }
 232
 233 static void system_set_sysctl(const char *path, const char *val)
 234 {
 235         int fd;
 236
 237         fd = open(path, O_WRONLY);
 238         if (fd < 0)
 239                 return;
 240
 241         if (write(fd, val, strlen(val))) {}
 242         close(fd);
 243 }
 244
 245 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 246 {
 247         snprintf(dev_buf, sizeof(dev_buf), path, device);
 248         system_set_sysctl(dev_buf, val);
 249 }
 250
 251 static void system_set_disable_ipv6(struct device *dev, const char *val)
 252 {
 253         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 254 }
 255
 256 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 257 {
 258         int fd = -1, ret = -1;
 259
 260         fd = open(path, O_RDONLY);
 261         if (fd < 0)
 262                 goto out;
 263
 264         ssize_t len = read(fd, buf, buf_sz - 1);
 265         if (len < 0)
 266                 goto out;
 267
 268         ret = buf[len] = 0;
 269
 270 out:
 271         if (fd >= 0)
 272                 close(fd);
 273
 274         return ret;
 275 }
 276
 277 static int
 278 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
 279 {
 280         snprintf(dev_buf, sizeof(dev_buf), path, device);
 281         return system_get_sysctl(dev_buf, buf, buf_sz);
 282 }
 283
 284 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
 285 {
 286         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
 287                         dev->ifname, buf, buf_sz);
 288 }
 289
 290 #ifndef IFF_LOWER_UP
 291 #define IFF_LOWER_UP    0x10000
 292 #endif
 293
 294 // Evaluate netlink messages
 295 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 296 {
 297         struct nlmsghdr *nh = nlmsg_hdr(msg);
 298         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 299         struct nlattr *nla[__IFLA_MAX];
 300
 301         if (nh->nlmsg_type != RTM_NEWLINK)
 302                 goto out;
 303
 304         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 305         if (!nla[IFLA_IFNAME])
 306                 goto out;
 307
 308         struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
 309         if (!dev)
 310                 goto out;
 311
 312         device_set_ifindex(dev, ifi->ifi_index);
 313         device_set_link(dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
 314
 315 out:
 316         return 0;
 317 }
 318
 319 static void
 320 handle_hotplug_msg(char *data, int size)
 321 {
 322         const char *subsystem = NULL, *interface = NULL;
 323         char *cur, *end, *sep;
 324         struct device *dev;
 325         int skip;
 326         bool add;
 327
 328         if (!strncmp(data, "add@", 4))
 329                 add = true;
 330         else if (!strncmp(data, "remove@", 7))
 331                 add = false;
 332         else
 333                 return;
 334
 335         skip = strlen(data) + 1;
 336         end = data + size;
 337
 338         for (cur = data + skip; cur < end; cur += skip) {
 339                 skip = strlen(cur) + 1;
 340
 341                 sep = strchr(cur, '=');
 342                 if (!sep)
 343                         continue;
 344
 345                 *sep = 0;
 346                 if (!strcmp(cur, "INTERFACE"))
 347                         interface = sep + 1;
 348                 else if (!strcmp(cur, "SUBSYSTEM")) {
 349                         subsystem = sep + 1;
 350                         if (strcmp(subsystem, "net") != 0)
 351                                 return;
 352                 }
 353                 if (subsystem && interface)
 354                         goto found;
 355         }
 356         return;
 357
 358 found:
 359         dev = device_get(interface, false);
 360         if (!dev)
 361                 return;
 362
 363         if (dev->type != &simple_device_type)
 364                 return;
 365
 366         if (add && system_if_force_external(dev->ifname))
 367                 return;
 368
 369         device_set_present(dev, add);
 370 }
 371
 372 static void
 373 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 374 {
 375         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 376         struct sockaddr_nl nla;
 377         unsigned char *buf = NULL;
 378         int size;
 379
 380         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 381                 if (nla.nl_pid == 0)
 382                         handle_hotplug_msg((char *) buf, size);
 383
 384                 free(buf);
 385         }
 386 }
 387
 388 static int system_rtnl_call(struct nl_msg *msg)
 389 {
 390         int ret;
 391
 392         ret = nl_send_auto_complete(sock_rtnl, msg);
 393         nlmsg_free(msg);
 394
 395         if (ret < 0)
 396                 return ret;
 397
 398         return nl_wait_for_ack(sock_rtnl);
 399 }
 400
 401 int system_bridge_delbr(struct device *bridge)
 402 {
 403         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 404 }
 405
 406 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 407 {
 408         struct ifreq ifr;
 409
 410         memset(&ifr, 0, sizeof(ifr));
 411         if (dev)
 412                 ifr.ifr_ifindex = dev->ifindex;
 413         else
 414                 ifr.ifr_data = data;
 415         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 416         return ioctl(sock_ioctl, cmd, &ifr);
 417 }
 418
 419 static bool system_is_bridge(const char *name, char *buf, int buflen)
 420 {
 421         struct stat st;
 422
 423         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 424         if (stat(buf, &st) < 0)
 425                 return false;
 426
 427         return true;
 428 }
 429
 430 static char *system_get_bridge(const char *name, char *buf, int buflen)
 431 {
 432         char *path;
 433         ssize_t len;
 434         glob_t gl;
 435
 436         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 437         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 438                 return NULL;
 439
 440         if (gl.gl_pathc == 0)
 441                 return NULL;
 442
 443         len = readlink(gl.gl_pathv[0], buf, buflen);
 444         if (len < 0)
 445                 return NULL;
 446
 447         buf[len] = 0;
 448         path = strrchr(buf, '/');
 449         if (!path)
 450                 return NULL;
 451
 452         return path + 1;
 453 }
 454
 455 static void system_bridge_set_wireless(const char *bridge, const char *dev)
 456 {
 457         snprintf(dev_buf, sizeof(dev_buf),
 458                  "/sys/devices/virtual/net/%s/brif/%s/multicast_to_unicast",
 459                  bridge, dev);
 460         system_set_sysctl(dev_buf, "1");
 461 }
 462
 463 int system_bridge_addif(struct device *bridge, struct device *dev)
 464 {
 465         char *oldbr;
 466         int ret = 0;
 467
 468         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 469         if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
 470                 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 471
 472         if (dev->wireless)
 473                 system_bridge_set_wireless(bridge->ifname, dev->ifname);
 474
 475         return ret;
 476 }
 477
 478 int system_bridge_delif(struct device *bridge, struct device *dev)
 479 {
 480         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 481 }
 482
 483 static int system_if_resolve(struct device *dev)
 484 {
 485         struct ifreq ifr;
 486         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 487         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 488                 return ifr.ifr_ifindex;
 489         else
 490                 return 0;
 491 }
 492
 493 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 494 {
 495         struct ifreq ifr;
 496
 497         memset(&ifr, 0, sizeof(ifr));
 498         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 499         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 500         ifr.ifr_flags |= add;
 501         ifr.ifr_flags &= ~rem;
 502         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 503 }
 504
 505 struct clear_data {
 506         struct nl_msg *msg;
 507         struct device *dev;
 508         int type;
 509         int size;
 510         int af;
 511 };
 512
 513
 514 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 515 {
 516         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 517
 518         return ifa->ifa_index == ifindex;
 519 }
 520
 521 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 522 {
 523         struct rtmsg *r = NLMSG_DATA(hdr);
 524         struct nlattr *tb[__RTA_MAX];
 525
 526         if (r->rtm_protocol == RTPROT_KERNEL &&
 527             r->rtm_family == AF_INET6)
 528                 return false;
 529
 530         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 531         if (!tb[RTA_OIF])
 532                 return false;
 533
 534         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 535 }
 536
 537 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 538 {
 539         return true;
 540 }
 541
 542 static int cb_clear_event(struct nl_msg *msg, void *arg)
 543 {
 544         struct clear_data *clr = arg;
 545         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 546         bool (*cb)(struct nlmsghdr *, int ifindex);
 547         int type;
 548
 549         switch(clr->type) {
 550         case RTM_GETADDR:
 551                 type = RTM_DELADDR;
 552                 if (hdr->nlmsg_type != RTM_NEWADDR)
 553                         return NL_SKIP;
 554
 555                 cb = check_ifaddr;
 556                 break;
 557         case RTM_GETROUTE:
 558                 type = RTM_DELROUTE;
 559                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 560                         return NL_SKIP;
 561
 562                 cb = check_route;
 563                 break;
 564         case RTM_GETRULE:
 565                 type = RTM_DELRULE;
 566                 if (hdr->nlmsg_type != RTM_NEWRULE)
 567                         return NL_SKIP;
 568
 569                 cb = check_rule;
 570                 break;
 571         default:
 572                 return NL_SKIP;
 573         }
 574
 575         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 576                 return NL_SKIP;
 577
 578         if (type == RTM_DELRULE)
 579                 D(SYSTEM, "Remove a rule\n");
 580         else
 581                 D(SYSTEM, "Remove %s from device %s\n",
 582                   type == RTM_DELADDR ? "an address" : "a route",
 583                   clr->dev->ifname);
 584         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 585         hdr = nlmsg_hdr(clr->msg);
 586         hdr->nlmsg_type = type;
 587         hdr->nlmsg_flags = NLM_F_REQUEST;
 588
 589         nl_socket_disable_auto_ack(sock_rtnl);
 590         nl_send_auto_complete(sock_rtnl, clr->msg);
 591         nl_socket_enable_auto_ack(sock_rtnl);
 592
 593         return NL_SKIP;
 594 }
 595
 596 static int
 597 cb_finish_event(struct nl_msg *msg, void *arg)
 598 {
 599         int *pending = arg;
 600         *pending = 0;
 601         return NL_STOP;
 602 }
 603
 604 static int
 605 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 606 {
 607         int *pending = arg;
 608         *pending = err->error;
 609         return NL_STOP;
 610 }
 611
 612 static void
 613 system_if_clear_entries(struct device *dev, int type, int af)
 614 {
 615         struct clear_data clr;
 616         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 617         struct rtmsg rtm = {
 618                 .rtm_family = af,
 619                 .rtm_flags = RTM_F_CLONED,
 620         };
 621         int flags = NLM_F_DUMP;
 622         int pending = 1;
 623
 624         clr.af = af;
 625         clr.dev = dev;
 626         clr.type = type;
 627         switch (type) {
 628         case RTM_GETADDR:
 629         case RTM_GETRULE:
 630                 clr.size = sizeof(struct rtgenmsg);
 631                 break;
 632         case RTM_GETROUTE:
 633                 clr.size = sizeof(struct rtmsg);
 634                 break;
 635         default:
 636                 return;
 637         }
 638
 639         if (!cb)
 640                 return;
 641
 642         clr.msg = nlmsg_alloc_simple(type, flags);
 643         if (!clr.msg)
 644                 goto out;
 645
 646         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 647         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 648         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 649         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 650
 651         nl_send_auto_complete(sock_rtnl, clr.msg);
 652         while (pending > 0)
 653                 nl_recvmsgs(sock_rtnl, cb);
 654
 655         nlmsg_free(clr.msg);
 656 out:
 657         nl_cb_put(cb);
 658 }
 659
 660 /*
 661  * Clear bridge (membership) state and bring down device
 662  */
 663 void system_if_clear_state(struct device *dev)
 664 {
 665         static char buf[256];
 666         char *bridge;
 667
 668         device_set_ifindex(dev, system_if_resolve(dev));
 669         if (dev->external || !dev->ifindex)
 670                 return;
 671
 672         system_if_flags(dev->ifname, 0, IFF_UP);
 673
 674         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 675                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 676                 system_bridge_delbr(dev);
 677                 return;
 678         }
 679
 680         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 681         if (bridge) {
 682                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 683                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 684         }
 685
 686         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 687         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 688         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 689         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 690         system_set_disable_ipv6(dev, "0");
 691 }
 692
 693 static inline unsigned long
 694 sec_to_jiffies(int val)
 695 {
 696         return (unsigned long) val * 100;
 697 }
 698
 699 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 700 {
 701         unsigned long args[4] = {};
 702
 703         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 704                 return -1;
 705
 706         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 707         args[1] = !!cfg->stp;
 708         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 709
 710         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 711         args[1] = sec_to_jiffies(cfg->forward_delay);
 712         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 713
 714         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 715                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 716
 717         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
 718                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 719
 720         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 721         args[1] = cfg->priority;
 722         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 723
 724         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 725                 args[0] = BRCTL_SET_AGEING_TIME;
 726                 args[1] = sec_to_jiffies(cfg->ageing_time);
 727                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 728         }
 729
 730         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 731                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 732                 args[1] = sec_to_jiffies(cfg->hello_time);
 733                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 734         }
 735
 736         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 737                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 738                 args[1] = sec_to_jiffies(cfg->max_age);
 739                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 740         }
 741
 742         return 0;
 743 }
 744
 745 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
 746 {
 747         struct nl_msg *msg;
 748         struct nlattr *linkinfo, *data;
 749         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
 750         int ifindex = system_if_resolve(dev);
 751         int i, rv;
 752         static const struct {
 753                 const char *name;
 754                 enum macvlan_mode val;
 755         } modes[] = {
 756                 { "private", MACVLAN_MODE_PRIVATE },
 757                 { "vepa", MACVLAN_MODE_VEPA },
 758                 { "bridge", MACVLAN_MODE_BRIDGE },
 759                 { "passthru", MACVLAN_MODE_PASSTHRU },
 760         };
 761
 762         if (ifindex == 0)
 763                 return -ENOENT;
 764
 765         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 766
 767         if (!msg)
 768                 return -1;
 769
 770         nlmsg_append(msg, &iim, sizeof(iim), 0);
 771
 772         if (cfg->flags & MACVLAN_OPT_MACADDR)
 773                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
 774         nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
 775         nla_put_u32(msg, IFLA_LINK, ifindex);
 776
 777         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 778                 goto nla_put_failure;
 779
 780         nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
 781
 782         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 783                 goto nla_put_failure;
 784
 785         if (cfg->mode) {
 786                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
 787                         if (strcmp(cfg->mode, modes[i].name) != 0)
 788                                 continue;
 789
 790                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
 791                         break;
 792                 }
 793         }
 794
 795         nla_nest_end(msg, data);
 796         nla_nest_end(msg, linkinfo);
 797
 798         rv = system_rtnl_call(msg);
 799         if (rv)
 800                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
 801
 802         return rv;
 803
 804 nla_put_failure:
 805         nlmsg_free(msg);
 806         return -ENOMEM;
 807 }
 808
 809 static int system_link_del(const char *ifname)
 810 {
 811         struct nl_msg *msg;
 812         struct ifinfomsg iim = {
 813                 .ifi_family = AF_UNSPEC,
 814                 .ifi_index = 0,
 815         };
 816
 817         msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
 818
 819         if (!msg)
 820                 return -1;
 821
 822         nlmsg_append(msg, &iim, sizeof(iim), 0);
 823         nla_put_string(msg, IFLA_IFNAME, ifname);
 824         return system_rtnl_call(msg);
 825 }
 826
 827 int system_macvlan_del(struct device *macvlan)
 828 {
 829         return system_link_del(macvlan->ifname);
 830 }
 831
 832 static int system_vlan(struct device *dev, int id)
 833 {
 834         struct vlan_ioctl_args ifr = {
 835                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 836                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 837         };
 838
 839         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 840
 841         if (id < 0) {
 842                 ifr.cmd = DEL_VLAN_CMD;
 843                 ifr.u.VID = 0;
 844         } else {
 845                 ifr.cmd = ADD_VLAN_CMD;
 846                 ifr.u.VID = id;
 847         }
 848         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 849         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 850 }
 851
 852 int system_vlan_add(struct device *dev, int id)
 853 {
 854         return system_vlan(dev, id);
 855 }
 856
 857 int system_vlan_del(struct device *dev)
 858 {
 859         return system_vlan(dev, -1);
 860 }
 861
 862 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
 863 {
 864         struct nl_msg *msg;
 865         struct nlattr *linkinfo, *data;
 866         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
 867         int ifindex = system_if_resolve(dev);
 868         int rv;
 869
 870         if (ifindex == 0)
 871                 return -ENOENT;
 872
 873         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 874
 875         if (!msg)
 876                 return -1;
 877
 878         nlmsg_append(msg, &iim, sizeof(iim), 0);
 879         nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
 880         nla_put_u32(msg, IFLA_LINK, ifindex);
 881
 882         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 883                 goto nla_put_failure;
 884
 885         nla_put_string(msg, IFLA_INFO_KIND, "vlan");
 886
 887         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 888                 goto nla_put_failure;
 889
 890         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
 891
 892 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
 893         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
 894 #else
 895         if(cfg->proto == VLAN_PROTO_8021AD)
 896                 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);
 897 #endif
 898
 899         nla_nest_end(msg, data);
 900         nla_nest_end(msg, linkinfo);
 901
 902         rv = system_rtnl_call(msg);
 903         if (rv)
 904                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
 905
 906         return rv;
 907
 908 nla_put_failure:
 909         nlmsg_free(msg);
 910         return -ENOMEM;
 911 }
 912
 913 int system_vlandev_del(struct device *vlandev)
 914 {
 915         return system_link_del(vlandev->ifname);
 916 }
 917
 918 static void
 919 system_if_get_settings(struct device *dev, struct device_settings *s)
 920 {
 921         struct ifreq ifr;
 922         char buf[10];
 923
 924         memset(&ifr, 0, sizeof(ifr));
 925         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 926
 927         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 928                 s->mtu = ifr.ifr_mtu;
 929                 s->flags |= DEV_OPT_MTU;
 930         }
 931
 932         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 933                 s->txqueuelen = ifr.ifr_qlen;
 934                 s->flags |= DEV_OPT_TXQUEUELEN;
 935         }
 936
 937         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 938                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 939                 s->flags |= DEV_OPT_MACADDR;
 940         }
 941
 942         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
 943                 s->ipv6 = !strtoul(buf, NULL, 0);
 944                 s->flags |= DEV_OPT_IPV6;
 945         }
 946 }
 947
 948 void
 949 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
 950 {
 951         struct ifreq ifr;
 952
 953         if (!apply_mask)
 954                 return;
 955
 956         memset(&ifr, 0, sizeof(ifr));
 957         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 958         if (s->flags & DEV_OPT_MTU & apply_mask) {
 959                 ifr.ifr_mtu = s->mtu;
 960                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 961                         s->flags &= ~DEV_OPT_MTU;
 962         }
 963         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
 964                 ifr.ifr_qlen = s->txqueuelen;
 965                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 966                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 967         }
 968         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
 969                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 970                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 971                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 972                         s->flags &= ~DEV_OPT_MACADDR;
 973         }
 974         if (s->flags & DEV_OPT_IPV6 & apply_mask)
 975                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
 976 }
 977
 978 int system_if_up(struct device *dev)
 979 {
 980         system_if_get_settings(dev, &dev->orig_settings);
 981         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 982         device_set_ifindex(dev, system_if_resolve(dev));
 983         return system_if_flags(dev->ifname, IFF_UP, 0);
 984 }
 985
 986 int system_if_down(struct device *dev)
 987 {
 988         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 989         dev->orig_settings.flags &= dev->settings.flags;
 990         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
 991         return ret;
 992 }
 993
 994 struct if_check_data {
 995         struct device *dev;
 996         int pending;
 997         int ret;
 998 };
 999
1000 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1001 {
1002         struct nlmsghdr *nh = nlmsg_hdr(msg);
1003         struct ifinfomsg *ifi = NLMSG_DATA(nh);
1004         struct if_check_data *chk = (struct if_check_data *)arg;
1005
1006         if (nh->nlmsg_type != RTM_NEWLINK)
1007                 return NL_SKIP;
1008
1009         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1010         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1011
1012         return NL_OK;
1013 }
1014
1015 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1016 {
1017         struct if_check_data *chk = (struct if_check_data *)arg;
1018         chk->pending = 0;
1019         return NL_STOP;
1020 }
1021
1022 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1023 {
1024         struct if_check_data *chk = (struct if_check_data *)arg;
1025
1026         device_set_present(chk->dev, false);
1027         device_set_link(chk->dev, false);
1028         chk->pending = err->error;
1029
1030         return NL_STOP;
1031 }
1032
1033 int system_if_check(struct device *dev)
1034 {
1035         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1036         struct nl_msg *msg;
1037         struct ifinfomsg ifi = {
1038                 .ifi_family = AF_UNSPEC,
1039                 .ifi_index = 0,
1040         };
1041         struct if_check_data chk = {
1042                 .dev = dev,
1043                 .pending = 1,
1044         };
1045         int ret = 1;
1046
1047         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1048         if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1049             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1050                 goto out;
1051
1052         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1053         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1054         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1055
1056         nl_send_auto_complete(sock_rtnl, msg);
1057         while (chk.pending > 0)
1058                 nl_recvmsgs(sock_rtnl, cb);
1059
1060         nlmsg_free(msg);
1061         ret = chk.pending;
1062
1063 out:
1064         nl_cb_put(cb);
1065         return ret;
1066 }
1067
1068 struct device *
1069 system_if_get_parent(struct device *dev)
1070 {
1071         char buf[64], *devname;
1072         int ifindex, iflink, len;
1073         FILE *f;
1074
1075         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1076         f = fopen(buf, "r");
1077         if (!f)
1078                 return NULL;
1079
1080         len = fread(buf, 1, sizeof(buf) - 1, f);
1081         fclose(f);
1082
1083         if (len <= 0)
1084                 return NULL;
1085
1086         buf[len] = 0;
1087         iflink = strtoul(buf, NULL, 0);
1088         ifindex = system_if_resolve(dev);
1089         if (!iflink || iflink == ifindex)
1090                 return NULL;
1091
1092         devname = if_indextoname(iflink, buf);
1093         if (!devname)
1094                 return NULL;
1095
1096         return device_get(devname, true);
1097 }
1098
1099 static bool
1100 read_string_file(int dir_fd, const char *file, char *buf, int len)
1101 {
1102         bool ret = false;
1103         char *c;
1104         int fd;
1105
1106         fd = openat(dir_fd, file, O_RDONLY);
1107         if (fd < 0)
1108                 return false;
1109
1110 retry:
1111         len = read(fd, buf, len - 1);
1112         if (len < 0) {
1113                 if (errno == EINTR)
1114                         goto retry;
1115         } else if (len > 0) {
1116                         buf[len] = 0;
1117
1118                         c = strchr(buf, '\n');
1119                         if (c)
1120                                 *c = 0;
1121
1122                         ret = true;
1123         }
1124
1125         close(fd);
1126
1127         return ret;
1128 }
1129
1130 static bool
1131 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1132 {
1133         char buf[64];
1134         bool ret = false;
1135
1136         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1137         if (ret)
1138                 *val = strtoull(buf, NULL, 0);
1139
1140         return ret;
1141 }
1142
1143 /* Assume advertised flags == supported flags */
1144 static const struct {
1145         uint32_t mask;
1146         const char *name;
1147 } ethtool_link_modes[] = {
1148         { ADVERTISED_10baseT_Half, "10H" },
1149         { ADVERTISED_10baseT_Full, "10F" },
1150         { ADVERTISED_100baseT_Half, "100H" },
1151         { ADVERTISED_100baseT_Full, "100F" },
1152         { ADVERTISED_1000baseT_Half, "1000H" },
1153         { ADVERTISED_1000baseT_Full, "1000F" },
1154 };
1155
1156 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1157 {
1158         int i;
1159         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1160                 if (mask & ethtool_link_modes[i].mask)
1161                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1162         }
1163 }
1164
1165 bool
1166 system_if_force_external(const char *ifname)
1167 {
1168         char buf[64];
1169         struct stat s;
1170
1171         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1172         return stat(buf, &s) == 0;
1173 }
1174
1175 int
1176 system_if_dump_info(struct device *dev, struct blob_buf *b)
1177 {
1178         struct ethtool_cmd ecmd;
1179         struct ifreq ifr;
1180         char buf[64], *s;
1181         void *c;
1182         int dir_fd;
1183
1184         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1185         dir_fd = open(buf, O_DIRECTORY);
1186
1187         memset(&ecmd, 0, sizeof(ecmd));
1188         memset(&ifr, 0, sizeof(ifr));
1189         strcpy(ifr.ifr_name, dev->ifname);
1190         ifr.ifr_data = (caddr_t) &ecmd;
1191         ecmd.cmd = ETHTOOL_GSET;
1192
1193         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1194                 c = blobmsg_open_array(b, "link-advertising");
1195                 system_add_link_modes(b, ecmd.advertising);
1196                 blobmsg_close_array(b, c);
1197
1198                 c = blobmsg_open_array(b, "link-supported");
1199                 system_add_link_modes(b, ecmd.supported);
1200                 blobmsg_close_array(b, c);
1201
1202                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1203                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1204                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1205                 blobmsg_add_string_buffer(b);
1206         }
1207
1208         close(dir_fd);
1209         return 0;
1210 }
1211
1212 int
1213 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1214 {
1215         const char *const counters[] = {
1216                 "collisions",     "rx_frame_errors",   "tx_compressed",
1217                 "multicast",      "rx_length_errors",  "tx_dropped",
1218                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1219                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1220                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1221                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1222                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1223                 "rx_fifo_errors", "tx_carrier_errors",
1224         };
1225         char buf[64];
1226         int stats_dir;
1227         int i;
1228         uint64_t val = 0;
1229
1230         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1231         stats_dir = open(buf, O_DIRECTORY);
1232         if (stats_dir < 0)
1233                 return -1;
1234
1235         for (i = 0; i < ARRAY_SIZE(counters); i++)
1236                 if (read_uint64_file(stats_dir, counters[i], &val))
1237                         blobmsg_add_u64(b, counters[i], val);
1238
1239         close(stats_dir);
1240         return 0;
1241 }
1242
1243 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1244 {
1245         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1246         int alen = v4 ? 4 : 16;
1247         unsigned int flags = 0;
1248         struct ifaddrmsg ifa = {
1249                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1250                 .ifa_prefixlen = addr->mask,
1251                 .ifa_index = dev->ifindex,
1252         };
1253
1254         struct nl_msg *msg;
1255         if (cmd == RTM_NEWADDR)
1256                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1257
1258         msg = nlmsg_alloc_simple(cmd, flags);
1259         if (!msg)
1260                 return -1;
1261
1262         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1263         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1264         if (v4) {
1265                 if (addr->broadcast)
1266                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1267                 if (addr->point_to_point)
1268                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1269         } else {
1270                 time_t now = system_get_rtime();
1271                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1272
1273                 if (addr->preferred_until) {
1274                         int64_t preferred = addr->preferred_until - now;
1275                         if (preferred < 0)
1276                                 preferred = 0;
1277                         else if (preferred > UINT32_MAX)
1278                                 preferred = UINT32_MAX;
1279
1280                         cinfo.ifa_prefered = preferred;
1281                 }
1282
1283                 if (addr->valid_until) {
1284                         int64_t valid = addr->valid_until - now;
1285                         if (valid <= 0)
1286                                 return -1;
1287                         else if (valid > UINT32_MAX)
1288                                 valid = UINT32_MAX;
1289
1290                         cinfo.ifa_valid = valid;
1291                 }
1292
1293                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1294         }
1295
1296         return system_rtnl_call(msg);
1297 }
1298
1299 int system_add_address(struct device *dev, struct device_addr *addr)
1300 {
1301         return system_addr(dev, addr, RTM_NEWADDR);
1302 }
1303
1304 int system_del_address(struct device *dev, struct device_addr *addr)
1305 {
1306         return system_addr(dev, addr, RTM_DELADDR);
1307 }
1308
1309 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1310 {
1311         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1312         bool have_gw;
1313         unsigned int flags = 0;
1314
1315         if (alen == 4)
1316                 have_gw = !!route->nexthop.in.s_addr;
1317         else
1318                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1319                         route->nexthop.in6.s6_addr32[1] ||
1320                         route->nexthop.in6.s6_addr32[2] ||
1321                         route->nexthop.in6.s6_addr32[3];
1322
1323         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1324                         ? route->table : RT_TABLE_MAIN;
1325
1326         struct rtmsg rtm = {
1327                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1328                 .rtm_dst_len = route->mask,
1329                 .rtm_src_len = route->sourcemask,
1330                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1331                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1332                 .rtm_scope = RT_SCOPE_NOWHERE,
1333                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1334                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1335         };
1336         struct nl_msg *msg;
1337
1338         if (cmd == RTM_NEWROUTE) {
1339                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1340
1341                 if (!dev) { // Add null-route
1342                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1343                         rtm.rtm_type = RTN_UNREACHABLE;
1344                 }
1345                 else
1346                         rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1347         }
1348
1349         if (route->flags & DEVROUTE_TYPE) {
1350                 rtm.rtm_type = route->type;
1351                 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1352                         if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1353                             rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1354                                 rtm.rtm_table = RT_TABLE_LOCAL;
1355                 }
1356
1357                 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT)
1358                         rtm.rtm_scope = RT_SCOPE_HOST;
1359                 else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1360                         rtm.rtm_type == RTN_ANYCAST)
1361                         rtm.rtm_scope = RT_SCOPE_LINK;
1362         }
1363
1364         msg = nlmsg_alloc_simple(cmd, flags);
1365         if (!msg)
1366                 return -1;
1367
1368         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1369
1370         if (route->mask)
1371                 nla_put(msg, RTA_DST, alen, &route->addr);
1372
1373         if (route->sourcemask)
1374                 nla_put(msg, RTA_SRC, alen, &route->source);
1375
1376         if (route->metric > 0)
1377                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1378
1379         if (have_gw)
1380                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1381
1382         if (dev)
1383                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1384
1385         if (table >= 256)
1386                 nla_put_u32(msg, RTA_TABLE, table);
1387
1388         if (route->flags & DEVROUTE_MTU) {
1389                 struct nlattr *metrics;
1390
1391                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1392                         goto nla_put_failure;
1393
1394                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1395
1396                 nla_nest_end(msg, metrics);
1397         }
1398
1399         return system_rtnl_call(msg);
1400
1401 nla_put_failure:
1402         nlmsg_free(msg);
1403         return -ENOMEM;
1404 }
1405
1406 int system_add_route(struct device *dev, struct device_route *route)
1407 {
1408         return system_rt(dev, route, RTM_NEWROUTE);
1409 }
1410
1411 int system_del_route(struct device *dev, struct device_route *route)
1412 {
1413         return system_rt(dev, route, RTM_DELROUTE);
1414 }
1415
1416 int system_flush_routes(void)
1417 {
1418         const char *names[] = {
1419                 "/proc/sys/net/ipv4/route/flush",
1420                 "/proc/sys/net/ipv6/route/flush"
1421         };
1422         int fd, i;
1423
1424         for (i = 0; i < ARRAY_SIZE(names); i++) {
1425                 fd = open(names[i], O_WRONLY);
1426                 if (fd < 0)
1427                         continue;
1428
1429                 if (write(fd, "-1", 2)) {}
1430                 close(fd);
1431         }
1432         return 0;
1433 }
1434
1435 bool system_resolve_rt_type(const char *type, unsigned int *id)
1436 {
1437         return system_rtn_aton(type, id);
1438 }
1439
1440 bool system_resolve_rt_table(const char *name, unsigned int *id)
1441 {
1442         FILE *f;
1443         char *e, buf[128];
1444         unsigned int n, table = RT_TABLE_UNSPEC;
1445
1446         /* first try to parse table as number */
1447         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1448                 table = n;
1449
1450         /* handle well known aliases */
1451         else if (!strcmp(name, "default"))
1452                 table = RT_TABLE_DEFAULT;
1453         else if (!strcmp(name, "main"))
1454                 table = RT_TABLE_MAIN;
1455         else if (!strcmp(name, "local"))
1456                 table = RT_TABLE_LOCAL;
1457
1458         /* try to look up name in /etc/iproute2/rt_tables */
1459         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1460         {
1461                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1462                 {
1463                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1464                                 continue;
1465
1466                         n = strtoul(e, NULL, 10);
1467                         e = strtok(NULL, " \t\n");
1468
1469                         if (e && !strcmp(e, name))
1470                         {
1471                                 table = n;
1472                                 break;
1473                         }
1474                 }
1475
1476                 fclose(f);
1477         }
1478
1479         if (table == RT_TABLE_UNSPEC)
1480                 return false;
1481
1482         *id = table;
1483         return true;
1484 }
1485
1486 bool system_is_default_rt_table(unsigned int id)
1487 {
1488         return (id == RT_TABLE_MAIN);
1489 }
1490
1491 static int system_iprule(struct iprule *rule, int cmd)
1492 {
1493         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1494
1495         struct nl_msg *msg;
1496         struct rtmsg rtm = {
1497                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1498                 .rtm_protocol = RTPROT_STATIC,
1499                 .rtm_scope = RT_SCOPE_UNIVERSE,
1500                 .rtm_table = RT_TABLE_UNSPEC,
1501                 .rtm_type = RTN_UNSPEC,
1502                 .rtm_flags = 0,
1503         };
1504
1505         if (cmd == RTM_NEWRULE) {
1506                 rtm.rtm_type = RTN_UNICAST;
1507                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1508         }
1509
1510         if (rule->invert)
1511                 rtm.rtm_flags |= FIB_RULE_INVERT;
1512
1513         if (rule->flags & IPRULE_SRC)
1514                 rtm.rtm_src_len = rule->src_mask;
1515
1516         if (rule->flags & IPRULE_DEST)
1517                 rtm.rtm_dst_len = rule->dest_mask;
1518
1519         if (rule->flags & IPRULE_TOS)
1520                 rtm.rtm_tos = rule->tos;
1521
1522         if (rule->flags & IPRULE_LOOKUP) {
1523                 if (rule->lookup < 256)
1524                         rtm.rtm_table = rule->lookup;
1525         }
1526
1527         if (rule->flags & IPRULE_ACTION)
1528                 rtm.rtm_type = rule->action;
1529         else if (rule->flags & IPRULE_GOTO)
1530                 rtm.rtm_type = FR_ACT_GOTO;
1531         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1532                 rtm.rtm_type = FR_ACT_NOP;
1533
1534         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1535
1536         if (!msg)
1537                 return -1;
1538
1539         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1540
1541         if (rule->flags & IPRULE_IN)
1542                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1543
1544         if (rule->flags & IPRULE_OUT)
1545                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1546
1547         if (rule->flags & IPRULE_SRC)
1548                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1549
1550         if (rule->flags & IPRULE_DEST)
1551                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1552
1553         if (rule->flags & IPRULE_PRIORITY)
1554                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1555         else if (cmd == RTM_NEWRULE)
1556                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1557
1558         if (rule->flags & IPRULE_FWMARK)
1559                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1560
1561         if (rule->flags & IPRULE_FWMASK)
1562                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1563
1564         if (rule->flags & IPRULE_LOOKUP) {
1565                 if (rule->lookup >= 256)
1566                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1567         }
1568
1569         if (rule->flags & IPRULE_GOTO)
1570                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1571
1572         return system_rtnl_call(msg);
1573 }
1574
1575 int system_add_iprule(struct iprule *rule)
1576 {
1577         return system_iprule(rule, RTM_NEWRULE);
1578 }
1579
1580 int system_del_iprule(struct iprule *rule)
1581 {
1582         return system_iprule(rule, RTM_DELRULE);
1583 }
1584
1585 int system_flush_iprules(void)
1586 {
1587         int rv = 0;
1588         struct iprule rule;
1589
1590         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1591         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1592
1593         memset(&rule, 0, sizeof(rule));
1594
1595
1596         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1597
1598         rule.priority = 0;
1599         rule.lookup = RT_TABLE_LOCAL;
1600         rv |= system_iprule(&rule, RTM_NEWRULE);
1601
1602         rule.priority = 32766;
1603         rule.lookup = RT_TABLE_MAIN;
1604         rv |= system_iprule(&rule, RTM_NEWRULE);
1605
1606         rule.priority = 32767;
1607         rule.lookup = RT_TABLE_DEFAULT;
1608         rv |= system_iprule(&rule, RTM_NEWRULE);
1609
1610
1611         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1612
1613         rule.priority = 0;
1614         rule.lookup = RT_TABLE_LOCAL;
1615         rv |= system_iprule(&rule, RTM_NEWRULE);
1616
1617         rule.priority = 32766;
1618         rule.lookup = RT_TABLE_MAIN;
1619         rv |= system_iprule(&rule, RTM_NEWRULE);
1620
1621         return rv;
1622 }
1623
1624 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1625 {
1626         return system_rtn_aton(action, id);
1627 }
1628
1629 time_t system_get_rtime(void)
1630 {
1631         struct timespec ts;
1632         struct timeval tv;
1633
1634         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1635                 return ts.tv_sec;
1636
1637         if (gettimeofday(&tv, NULL) == 0)
1638                 return tv.tv_sec;
1639
1640         return 0;
1641 }
1642
1643 #ifndef IP_DF
1644 #define IP_DF       0x4000
1645 #endif
1646
1647 static int tunnel_ioctl(const char *name, int cmd, void *p)
1648 {
1649         struct ifreq ifr;
1650
1651         memset(&ifr, 0, sizeof(ifr));
1652         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1653         ifr.ifr_ifru.ifru_data = p;
1654         return ioctl(sock_ioctl, cmd, &ifr);
1655 }
1656
1657 #ifdef IFLA_IPTUN_MAX
1658 static int system_add_gre_tunnel(const char *name, const char *kind,
1659                                  const unsigned int link, struct blob_attr **tb, bool v6)
1660 {
1661         struct nl_msg *nlm;
1662         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
1663         struct blob_attr *cur;
1664         uint32_t ikey = 0, okey = 0;
1665         uint16_t iflags = 0, oflags = 0;
1666         int ret = 0, ttl = 64;
1667
1668         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1669         if (!nlm)
1670                 return -1;
1671
1672         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1673         nla_put_string(nlm, IFLA_IFNAME, name);
1674
1675         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1676         if (!linkinfo) {
1677                 ret = -ENOMEM;
1678                 goto failure;
1679         }
1680
1681         nla_put_string(nlm, IFLA_INFO_KIND, kind);
1682         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1683         if (!infodata) {
1684                 ret = -ENOMEM;
1685                 goto failure;
1686         }
1687
1688         if (link)
1689                 nla_put_u32(nlm, IFLA_GRE_LINK, link);
1690
1691         if ((cur = tb[TUNNEL_ATTR_TTL]))
1692                 ttl = blobmsg_get_u32(cur);
1693
1694         nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
1695
1696         if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
1697                 uint8_t icsum, ocsum, iseqno, oseqno;
1698                 if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
1699                         &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
1700                         ret = -EINVAL;
1701                         goto failure;
1702                 }
1703
1704                 if (ikey)
1705                         iflags |= GRE_KEY;
1706
1707                 if (okey)
1708                         oflags |= GRE_KEY;
1709
1710                 if (icsum)
1711                         iflags |= GRE_CSUM;
1712
1713                 if (ocsum)
1714                         oflags |= GRE_CSUM;
1715
1716                 if (iseqno)
1717                         iflags |= GRE_SEQ;
1718
1719                 if (oseqno)
1720                         oflags |= GRE_SEQ;
1721         }
1722
1723         if (v6) {
1724                 struct in6_addr in6buf;
1725                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1726                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1727                                 ret = -EINVAL;
1728                                 goto failure;
1729                         }
1730                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
1731                 }
1732
1733                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1734                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1735                                 ret = -EINVAL;
1736                                 goto failure;
1737                         }
1738                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
1739                 }
1740                 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
1741         } else {
1742                 struct in_addr inbuf;
1743                 bool set_df = true;
1744
1745                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1746                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1747                                 ret = -EINVAL;
1748                                 goto failure;
1749                         }
1750                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
1751                 }
1752
1753                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1754                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1755                                 ret = -EINVAL;
1756                                 goto failure;
1757                         }
1758                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
1759
1760                         if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
1761                                 if (!okey) {
1762                                         okey = inbuf.s_addr;
1763                                         oflags |= GRE_KEY;
1764                                 }
1765
1766                                 if (!ikey) {
1767                                         ikey = inbuf.s_addr;
1768                                         iflags |= GRE_KEY;
1769                                 }
1770                         }
1771                 }
1772
1773                 if ((cur = tb[TUNNEL_ATTR_DF]))
1774                         set_df = blobmsg_get_bool(cur);
1775
1776                 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
1777         }
1778
1779         if (oflags)
1780                 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
1781
1782         if (iflags)
1783                 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
1784
1785         if (okey)
1786                 nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
1787
1788         if (ikey)
1789                 nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
1790
1791         nla_nest_end(nlm, infodata);
1792         nla_nest_end(nlm, linkinfo);
1793
1794         return system_rtnl_call(nlm);
1795
1796 failure:
1797         nlmsg_free(nlm);
1798         return ret;
1799 }
1800 #endif
1801
1802 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
1803 {
1804         struct blob_attr *cur;
1805         const char *str;
1806
1807         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1808                 return -EINVAL;
1809         str = blobmsg_data(cur);
1810
1811         if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
1812             !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
1813                 return system_link_del(name);
1814         else
1815                 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1816 }
1817
1818 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
1819 {
1820         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1821
1822         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1823                 blob_data(attr), blob_len(attr));
1824
1825         return __system_del_ip_tunnel(name, tb);
1826 }
1827
1828 int system_update_ipv6_mtu(struct device *dev, int mtu)
1829 {
1830         int ret = -1;
1831         char buf[64];
1832         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1833                         dev->ifname);
1834
1835         int fd = open(buf, O_RDWR);
1836         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1837         if (len < 0)
1838                 goto out;
1839
1840         buf[len] = 0;
1841         ret = atoi(buf);
1842
1843         if (!mtu || ret <= mtu)
1844                 goto out;
1845
1846         lseek(fd, 0, SEEK_SET);
1847         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1848                 ret = -1;
1849
1850 out:
1851         close(fd);
1852         return ret;
1853 }
1854
1855 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1856 {
1857         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1858         struct blob_attr *cur;
1859         bool set_df = true;
1860         const char *str;
1861
1862         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1863                 blob_data(attr), blob_len(attr));
1864
1865         __system_del_ip_tunnel(name, tb);
1866
1867         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1868                 return -EINVAL;
1869         str = blobmsg_data(cur);
1870
1871         if ((cur = tb[TUNNEL_ATTR_DF]))
1872                 set_df = blobmsg_get_bool(cur);
1873
1874         unsigned int ttl = 0;
1875         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1876                 ttl = blobmsg_get_u32(cur);
1877                 if (ttl > 255 || (!set_df && ttl))
1878                         return -EINVAL;
1879         }
1880
1881         unsigned int link = 0;
1882         if ((cur = tb[TUNNEL_ATTR_LINK])) {
1883                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
1884                 if (!iface)
1885                         return -EINVAL;
1886
1887                 if (iface->l3_dev.dev)
1888                         link = iface->l3_dev.dev->ifindex;
1889         }
1890
1891         if (!strcmp(str, "sit")) {
1892                 struct ip_tunnel_parm p = {
1893                         .link = link,
1894                         .iph = {
1895                                 .version = 4,
1896                                 .ihl = 5,
1897                                 .frag_off = set_df ? htons(IP_DF) : 0,
1898                                 .protocol = IPPROTO_IPV6,
1899                                 .ttl = ttl
1900                         }
1901                 };
1902
1903                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1904                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1905                         return -EINVAL;
1906
1907                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1908                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1909                         return -EINVAL;
1910
1911                 strncpy(p.name, name, sizeof(p.name));
1912                 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1913                         return -1;
1914
1915 #ifdef SIOCADD6RD
1916                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1917                         unsigned int mask;
1918                         struct ip_tunnel_6rd p6;
1919
1920                         memset(&p6, 0, sizeof(p6));
1921
1922                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1923                                                 &p6.prefix, &mask) || mask > 128)
1924                                 return -EINVAL;
1925                         p6.prefixlen = mask;
1926
1927                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1928                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1929                                                         &p6.relay_prefix, &mask) || mask > 32)
1930                                         return -EINVAL;
1931                                 p6.relay_prefixlen = mask;
1932                         }
1933
1934                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1935                                 __system_del_ip_tunnel(name, tb);
1936                                 return -1;
1937                         }
1938                 }
1939 #endif
1940 #ifdef IFLA_IPTUN_MAX
1941         } else if (!strcmp(str, "ipip6")) {
1942                 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
1943                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1944                 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
1945                 int ret = 0;
1946
1947                 if (!nlm)
1948                         return -1;
1949
1950                 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1951                 nla_put_string(nlm, IFLA_IFNAME, name);
1952
1953                 if (link)
1954                         nla_put_u32(nlm, IFLA_LINK, link);
1955
1956                 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1957                 if (!linkinfo) {
1958                         ret = -ENOMEM;
1959                         goto failure;
1960                 }
1961                 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
1962                 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1963                 if (!infodata) {
1964                         ret = -ENOMEM;
1965                         goto failure;
1966                 }
1967
1968                 if (link)
1969                         nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
1970
1971                 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
1972                 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
1973                 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
1974
1975                 struct in6_addr in6buf;
1976                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1977                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1978                                 ret = -EINVAL;
1979                                 goto failure;
1980                         }
1981                         nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
1982                 }
1983
1984                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1985                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1986                                 ret = -EINVAL;
1987                                 goto failure;
1988                         }
1989                         nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
1990                 }
1991
1992 #ifdef IFLA_IPTUN_FMR_MAX
1993                 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
1994                         struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
1995
1996                         struct blob_attr *fmr;
1997                         unsigned rem, fmrcnt = 0;
1998                         blobmsg_for_each_attr(fmr, cur, rem) {
1999                                 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
2000                                         continue;
2001
2002                                 unsigned ip4len, ip6len, ealen, offset = 6;
2003                                 char ip6buf[48];
2004                                 char ip4buf[16];
2005
2006                                 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
2007                                                 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
2008                                         ret = -EINVAL;
2009                                         goto failure;
2010                                 }
2011
2012                                 struct in6_addr ip6prefix;
2013                                 struct in_addr ip4prefix;
2014                                 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
2015                                                 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
2016                                         ret = -EINVAL;
2017                                         goto failure;
2018                                 }
2019
2020                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2021
2022                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2023                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2024                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2025                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2026                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2027                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2028
2029                                 nla_nest_end(nlm, rule);
2030                         }
2031
2032                         nla_nest_end(nlm, fmrs);
2033                 }
2034 #endif
2035
2036                 nla_nest_end(nlm, infodata);
2037                 nla_nest_end(nlm, linkinfo);
2038
2039                 return system_rtnl_call(nlm);
2040 failure:
2041                 nlmsg_free(nlm);
2042                 return ret;
2043         } else if (!strcmp(str, "greip")) {
2044                 return system_add_gre_tunnel(name, "gre", link, tb, false);
2045         } else if (!strcmp(str, "gretapip"))  {
2046                 return system_add_gre_tunnel(name, "gretap", link, tb, false);
2047         } else if (!strcmp(str, "greip6")) {
2048                 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
2049         } else if (!strcmp(str, "gretapip6")) {
2050                 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
2051 #endif
2052         }
2053         else
2054                 return -EINVAL;
2055
2056         return 0;
2057 }