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 static bool
 208 system_tos_aton(const char *src, unsigned *dst)
 209 {
 210         char *e;
 211
 212         *dst = strtoul(src, &e, 16);
 213         if (e == src || *e || *dst > 255)
 214                 return false;
 215
 216         return true;
 217 }
 218
 219 int system_init(void)
 220 {
 221         static struct event_socket rtnl_event;
 222         static struct event_socket hotplug_event;
 223
 224         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 225         system_fd_set_cloexec(sock_ioctl);
 226
 227         // Prepare socket for routing / address control
 228         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 229         if (!sock_rtnl)
 230                 return -1;
 231
 232         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 233                 return -1;
 234
 235         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 236                                      handle_hotplug_event, 0))
 237                 return -1;
 238
 239         // Receive network link events form kernel
 240         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 241
 242         return 0;
 243 }
 244
 245 static void system_set_sysctl(const char *path, const char *val)
 246 {
 247         int fd;
 248
 249         fd = open(path, O_WRONLY);
 250         if (fd < 0)
 251                 return;
 252
 253         if (write(fd, val, strlen(val))) {}
 254         close(fd);
 255 }
 256
 257 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 258 {
 259         snprintf(dev_buf, sizeof(dev_buf), path, device);
 260         system_set_sysctl(dev_buf, val);
 261 }
 262
 263 static void system_set_disable_ipv6(struct device *dev, const char *val)
 264 {
 265         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 266 }
 267
 268 static void system_set_rpfilter(struct device *dev, const char *val)
 269 {
 270         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
 271 }
 272
 273 static void system_set_acceptlocal(struct device *dev, const char *val)
 274 {
 275         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
 276 }
 277
 278 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 279 {
 280         int fd = -1, ret = -1;
 281
 282         fd = open(path, O_RDONLY);
 283         if (fd < 0)
 284                 goto out;
 285
 286         ssize_t len = read(fd, buf, buf_sz - 1);
 287         if (len < 0)
 288                 goto out;
 289
 290         ret = buf[len] = 0;
 291
 292 out:
 293         if (fd >= 0)
 294                 close(fd);
 295
 296         return ret;
 297 }
 298
 299 static int
 300 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
 301 {
 302         snprintf(dev_buf, sizeof(dev_buf), path, device);
 303         return system_get_sysctl(dev_buf, buf, buf_sz);
 304 }
 305
 306 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
 307 {
 308         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
 309                         dev->ifname, buf, buf_sz);
 310 }
 311
 312 static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
 313 {
 314         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
 315                         dev->ifname, buf, buf_sz);
 316 }
 317
 318 static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
 319 {
 320         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
 321                         dev->ifname, buf, buf_sz);
 322 }
 323
 324 // Evaluate netlink messages
 325 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 326 {
 327         struct nlmsghdr *nh = nlmsg_hdr(msg);
 328         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 329         struct nlattr *nla[__IFLA_MAX];
 330         int link_state = 0;
 331         char buf[10];
 332
 333         if (nh->nlmsg_type != RTM_NEWLINK)
 334                 goto out;
 335
 336         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 337         if (!nla[IFLA_IFNAME])
 338                 goto out;
 339
 340         struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
 341         if (!dev || dev->type->keep_link_status)
 342                 goto out;
 343
 344         if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
 345                 link_state = strtoul(buf, NULL, 0);
 346
 347         device_set_link(dev, link_state ? true : false);
 348
 349 out:
 350         return 0;
 351 }
 352
 353 static void
 354 handle_hotplug_msg(char *data, int size)
 355 {
 356         const char *subsystem = NULL, *interface = NULL;
 357         char *cur, *end, *sep;
 358         struct device *dev;
 359         int skip;
 360         bool add;
 361
 362         if (!strncmp(data, "add@", 4))
 363                 add = true;
 364         else if (!strncmp(data, "remove@", 7))
 365                 add = false;
 366         else
 367                 return;
 368
 369         skip = strlen(data) + 1;
 370         end = data + size;
 371
 372         for (cur = data + skip; cur < end; cur += skip) {
 373                 skip = strlen(cur) + 1;
 374
 375                 sep = strchr(cur, '=');
 376                 if (!sep)
 377                         continue;
 378
 379                 *sep = 0;
 380                 if (!strcmp(cur, "INTERFACE"))
 381                         interface = sep + 1;
 382                 else if (!strcmp(cur, "SUBSYSTEM")) {
 383                         subsystem = sep + 1;
 384                         if (strcmp(subsystem, "net") != 0)
 385                                 return;
 386                 }
 387                 if (subsystem && interface)
 388                         goto found;
 389         }
 390         return;
 391
 392 found:
 393         dev = device_get(interface, false);
 394         if (!dev)
 395                 return;
 396
 397         if (dev->type != &simple_device_type)
 398                 return;
 399
 400         if (add && system_if_force_external(dev->ifname))
 401                 return;
 402
 403         device_set_present(dev, add);
 404 }
 405
 406 static void
 407 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 408 {
 409         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 410         struct sockaddr_nl nla;
 411         unsigned char *buf = NULL;
 412         int size;
 413
 414         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 415                 if (nla.nl_pid == 0)
 416                         handle_hotplug_msg((char *) buf, size);
 417
 418                 free(buf);
 419         }
 420 }
 421
 422 static int system_rtnl_call(struct nl_msg *msg)
 423 {
 424         int ret;
 425
 426         ret = nl_send_auto_complete(sock_rtnl, msg);
 427         nlmsg_free(msg);
 428
 429         if (ret < 0)
 430                 return ret;
 431
 432         return nl_wait_for_ack(sock_rtnl);
 433 }
 434
 435 int system_bridge_delbr(struct device *bridge)
 436 {
 437         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 438 }
 439
 440 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 441 {
 442         struct ifreq ifr;
 443
 444         memset(&ifr, 0, sizeof(ifr));
 445         if (dev)
 446                 ifr.ifr_ifindex = dev->ifindex;
 447         else
 448                 ifr.ifr_data = data;
 449         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 450         return ioctl(sock_ioctl, cmd, &ifr);
 451 }
 452
 453 static bool system_is_bridge(const char *name, char *buf, int buflen)
 454 {
 455         struct stat st;
 456
 457         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 458         if (stat(buf, &st) < 0)
 459                 return false;
 460
 461         return true;
 462 }
 463
 464 static char *system_get_bridge(const char *name, char *buf, int buflen)
 465 {
 466         char *path;
 467         ssize_t len = -1;
 468         glob_t gl;
 469
 470         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 471         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 472                 return NULL;
 473
 474         if (gl.gl_pathc > 0)
 475                 len = readlink(gl.gl_pathv[0], buf, buflen);
 476
 477         globfree(&gl);
 478
 479         if (len < 0)
 480                 return NULL;
 481
 482         buf[len] = 0;
 483         path = strrchr(buf, '/');
 484         if (!path)
 485                 return NULL;
 486
 487         return path + 1;
 488 }
 489
 490 static void system_bridge_set_wireless(const char *bridge, const char *dev)
 491 {
 492         snprintf(dev_buf, sizeof(dev_buf),
 493                  "/sys/devices/virtual/net/%s/brif/%s/multicast_to_unicast",
 494                  bridge, dev);
 495         system_set_sysctl(dev_buf, "1");
 496 }
 497
 498 int system_bridge_addif(struct device *bridge, struct device *dev)
 499 {
 500         char *oldbr;
 501         int ret = 0;
 502
 503         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 504         if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
 505                 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 506
 507         if (dev->wireless)
 508                 system_bridge_set_wireless(bridge->ifname, dev->ifname);
 509
 510         return ret;
 511 }
 512
 513 int system_bridge_delif(struct device *bridge, struct device *dev)
 514 {
 515         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 516 }
 517
 518 int system_if_resolve(struct device *dev)
 519 {
 520         struct ifreq ifr;
 521         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 522         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 523                 return ifr.ifr_ifindex;
 524         else
 525                 return 0;
 526 }
 527
 528 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 529 {
 530         struct ifreq ifr;
 531
 532         memset(&ifr, 0, sizeof(ifr));
 533         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 534         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 535         ifr.ifr_flags |= add;
 536         ifr.ifr_flags &= ~rem;
 537         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 538 }
 539
 540 struct clear_data {
 541         struct nl_msg *msg;
 542         struct device *dev;
 543         int type;
 544         int size;
 545         int af;
 546 };
 547
 548
 549 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 550 {
 551         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 552
 553         return ifa->ifa_index == ifindex;
 554 }
 555
 556 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 557 {
 558         struct rtmsg *r = NLMSG_DATA(hdr);
 559         struct nlattr *tb[__RTA_MAX];
 560
 561         if (r->rtm_protocol == RTPROT_KERNEL &&
 562             r->rtm_family == AF_INET6)
 563                 return false;
 564
 565         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 566         if (!tb[RTA_OIF])
 567                 return false;
 568
 569         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 570 }
 571
 572 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 573 {
 574         return true;
 575 }
 576
 577 static int cb_clear_event(struct nl_msg *msg, void *arg)
 578 {
 579         struct clear_data *clr = arg;
 580         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 581         bool (*cb)(struct nlmsghdr *, int ifindex);
 582         int type;
 583
 584         switch(clr->type) {
 585         case RTM_GETADDR:
 586                 type = RTM_DELADDR;
 587                 if (hdr->nlmsg_type != RTM_NEWADDR)
 588                         return NL_SKIP;
 589
 590                 cb = check_ifaddr;
 591                 break;
 592         case RTM_GETROUTE:
 593                 type = RTM_DELROUTE;
 594                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 595                         return NL_SKIP;
 596
 597                 cb = check_route;
 598                 break;
 599         case RTM_GETRULE:
 600                 type = RTM_DELRULE;
 601                 if (hdr->nlmsg_type != RTM_NEWRULE)
 602                         return NL_SKIP;
 603
 604                 cb = check_rule;
 605                 break;
 606         default:
 607                 return NL_SKIP;
 608         }
 609
 610         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 611                 return NL_SKIP;
 612
 613         if (type == RTM_DELRULE)
 614                 D(SYSTEM, "Remove a rule\n");
 615         else
 616                 D(SYSTEM, "Remove %s from device %s\n",
 617                   type == RTM_DELADDR ? "an address" : "a route",
 618                   clr->dev->ifname);
 619         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 620         hdr = nlmsg_hdr(clr->msg);
 621         hdr->nlmsg_type = type;
 622         hdr->nlmsg_flags = NLM_F_REQUEST;
 623
 624         nl_socket_disable_auto_ack(sock_rtnl);
 625         nl_send_auto_complete(sock_rtnl, clr->msg);
 626         nl_socket_enable_auto_ack(sock_rtnl);
 627
 628         return NL_SKIP;
 629 }
 630
 631 static int
 632 cb_finish_event(struct nl_msg *msg, void *arg)
 633 {
 634         int *pending = arg;
 635         *pending = 0;
 636         return NL_STOP;
 637 }
 638
 639 static int
 640 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 641 {
 642         int *pending = arg;
 643         *pending = err->error;
 644         return NL_STOP;
 645 }
 646
 647 static void
 648 system_if_clear_entries(struct device *dev, int type, int af)
 649 {
 650         struct clear_data clr;
 651         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 652         struct rtmsg rtm = {
 653                 .rtm_family = af,
 654                 .rtm_flags = RTM_F_CLONED,
 655         };
 656         int flags = NLM_F_DUMP;
 657         int pending = 1;
 658
 659         clr.af = af;
 660         clr.dev = dev;
 661         clr.type = type;
 662         switch (type) {
 663         case RTM_GETADDR:
 664         case RTM_GETRULE:
 665                 clr.size = sizeof(struct rtgenmsg);
 666                 break;
 667         case RTM_GETROUTE:
 668                 clr.size = sizeof(struct rtmsg);
 669                 break;
 670         default:
 671                 return;
 672         }
 673
 674         if (!cb)
 675                 return;
 676
 677         clr.msg = nlmsg_alloc_simple(type, flags);
 678         if (!clr.msg)
 679                 goto out;
 680
 681         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 682         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 683         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 684         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 685
 686         nl_send_auto_complete(sock_rtnl, clr.msg);
 687         while (pending > 0)
 688                 nl_recvmsgs(sock_rtnl, cb);
 689
 690         nlmsg_free(clr.msg);
 691 out:
 692         nl_cb_put(cb);
 693 }
 694
 695 /*
 696  * Clear bridge (membership) state and bring down device
 697  */
 698 void system_if_clear_state(struct device *dev)
 699 {
 700         static char buf[256];
 701         char *bridge;
 702
 703         device_set_ifindex(dev, system_if_resolve(dev));
 704         if (dev->external || !dev->ifindex)
 705                 return;
 706
 707         system_if_flags(dev->ifname, 0, IFF_UP);
 708
 709         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 710                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 711                 system_bridge_delbr(dev);
 712                 return;
 713         }
 714
 715         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 716         if (bridge) {
 717                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 718                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 719         }
 720
 721         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 722         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 723         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 724         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 725         system_set_disable_ipv6(dev, "0");
 726 }
 727
 728 static inline unsigned long
 729 sec_to_jiffies(int val)
 730 {
 731         return (unsigned long) val * 100;
 732 }
 733
 734 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 735 {
 736         unsigned long args[4] = {};
 737
 738         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 739                 return -1;
 740
 741         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 742         args[1] = !!cfg->stp;
 743         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 744
 745         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 746         args[1] = sec_to_jiffies(cfg->forward_delay);
 747         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 748
 749         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 750                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 751
 752         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
 753                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 754
 755         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 756         args[1] = cfg->priority;
 757         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 758
 759         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 760                 args[0] = BRCTL_SET_AGEING_TIME;
 761                 args[1] = sec_to_jiffies(cfg->ageing_time);
 762                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 763         }
 764
 765         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 766                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 767                 args[1] = sec_to_jiffies(cfg->hello_time);
 768                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 769         }
 770
 771         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 772                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 773                 args[1] = sec_to_jiffies(cfg->max_age);
 774                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 775         }
 776
 777         return 0;
 778 }
 779
 780 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
 781 {
 782         struct nl_msg *msg;
 783         struct nlattr *linkinfo, *data;
 784         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
 785         int i, rv;
 786         static const struct {
 787                 const char *name;
 788                 enum macvlan_mode val;
 789         } modes[] = {
 790                 { "private", MACVLAN_MODE_PRIVATE },
 791                 { "vepa", MACVLAN_MODE_VEPA },
 792                 { "bridge", MACVLAN_MODE_BRIDGE },
 793                 { "passthru", MACVLAN_MODE_PASSTHRU },
 794         };
 795
 796         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 797
 798         if (!msg)
 799                 return -1;
 800
 801         nlmsg_append(msg, &iim, sizeof(iim), 0);
 802
 803         if (cfg->flags & MACVLAN_OPT_MACADDR)
 804                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
 805         nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
 806         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
 807
 808         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 809                 goto nla_put_failure;
 810
 811         nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
 812
 813         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 814                 goto nla_put_failure;
 815
 816         if (cfg->mode) {
 817                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
 818                         if (strcmp(cfg->mode, modes[i].name) != 0)
 819                                 continue;
 820
 821                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
 822                         break;
 823                 }
 824         }
 825
 826         nla_nest_end(msg, data);
 827         nla_nest_end(msg, linkinfo);
 828
 829         rv = system_rtnl_call(msg);
 830         if (rv)
 831                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
 832
 833         return rv;
 834
 835 nla_put_failure:
 836         nlmsg_free(msg);
 837         return -ENOMEM;
 838 }
 839
 840 static int system_link_del(const char *ifname)
 841 {
 842         struct nl_msg *msg;
 843         struct ifinfomsg iim = {
 844                 .ifi_family = AF_UNSPEC,
 845                 .ifi_index = 0,
 846         };
 847
 848         msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
 849
 850         if (!msg)
 851                 return -1;
 852
 853         nlmsg_append(msg, &iim, sizeof(iim), 0);
 854         nla_put_string(msg, IFLA_IFNAME, ifname);
 855         return system_rtnl_call(msg);
 856 }
 857
 858 int system_macvlan_del(struct device *macvlan)
 859 {
 860         return system_link_del(macvlan->ifname);
 861 }
 862
 863 static int system_vlan(struct device *dev, int id)
 864 {
 865         struct vlan_ioctl_args ifr = {
 866                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 867                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 868         };
 869
 870         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 871
 872         if (id < 0) {
 873                 ifr.cmd = DEL_VLAN_CMD;
 874                 ifr.u.VID = 0;
 875         } else {
 876                 ifr.cmd = ADD_VLAN_CMD;
 877                 ifr.u.VID = id;
 878         }
 879         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 880         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 881 }
 882
 883 int system_vlan_add(struct device *dev, int id)
 884 {
 885         return system_vlan(dev, id);
 886 }
 887
 888 int system_vlan_del(struct device *dev)
 889 {
 890         return system_vlan(dev, -1);
 891 }
 892
 893 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
 894 {
 895         struct nl_msg *msg;
 896         struct nlattr *linkinfo, *data;
 897         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
 898         int rv;
 899
 900         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 901
 902         if (!msg)
 903                 return -1;
 904
 905         nlmsg_append(msg, &iim, sizeof(iim), 0);
 906         nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
 907         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
 908
 909         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 910                 goto nla_put_failure;
 911
 912         nla_put_string(msg, IFLA_INFO_KIND, "vlan");
 913
 914         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 915                 goto nla_put_failure;
 916
 917         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
 918
 919 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
 920         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
 921 #else
 922         if(cfg->proto == VLAN_PROTO_8021AD)
 923                 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);
 924 #endif
 925
 926         nla_nest_end(msg, data);
 927         nla_nest_end(msg, linkinfo);
 928
 929         rv = system_rtnl_call(msg);
 930         if (rv)
 931                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
 932
 933         return rv;
 934
 935 nla_put_failure:
 936         nlmsg_free(msg);
 937         return -ENOMEM;
 938 }
 939
 940 int system_vlandev_del(struct device *vlandev)
 941 {
 942         return system_link_del(vlandev->ifname);
 943 }
 944
 945 static void
 946 system_if_get_settings(struct device *dev, struct device_settings *s)
 947 {
 948         struct ifreq ifr;
 949         char buf[10];
 950
 951         memset(&ifr, 0, sizeof(ifr));
 952         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 953
 954         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 955                 s->mtu = ifr.ifr_mtu;
 956                 s->flags |= DEV_OPT_MTU;
 957         }
 958
 959         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 960                 s->txqueuelen = ifr.ifr_qlen;
 961                 s->flags |= DEV_OPT_TXQUEUELEN;
 962         }
 963
 964         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 965                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 966                 s->flags |= DEV_OPT_MACADDR;
 967         }
 968
 969         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
 970                 s->ipv6 = !strtoul(buf, NULL, 0);
 971                 s->flags |= DEV_OPT_IPV6;
 972         }
 973
 974         if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
 975                 s->promisc = ifr.ifr_flags & IFF_PROMISC;
 976                 s->flags |= DEV_OPT_PROMISC;
 977         }
 978
 979         if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
 980                 s->rpfilter = strtoul(buf, NULL, 0);
 981                 s->flags |= DEV_OPT_RPFILTER;
 982         }
 983
 984         if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
 985                 s->acceptlocal = strtoul(buf, NULL, 0);
 986                 s->flags |= DEV_OPT_ACCEPTLOCAL;
 987         }
 988 }
 989
 990 void
 991 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
 992 {
 993         struct ifreq ifr;
 994
 995         if (!apply_mask)
 996                 return;
 997
 998         memset(&ifr, 0, sizeof(ifr));
 999         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1000         if (s->flags & DEV_OPT_MTU & apply_mask) {
1001                 ifr.ifr_mtu = s->mtu;
1002                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
1003                         s->flags &= ~DEV_OPT_MTU;
1004         }
1005         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
1006                 ifr.ifr_qlen = s->txqueuelen;
1007                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
1008                         s->flags &= ~DEV_OPT_TXQUEUELEN;
1009         }
1010         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
1011                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
1012                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
1013                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
1014                         s->flags &= ~DEV_OPT_MACADDR;
1015         }
1016         if (s->flags & DEV_OPT_IPV6 & apply_mask)
1017                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
1018         if (s->flags & DEV_OPT_PROMISC & apply_mask) {
1019                 if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
1020                                     !s->promisc ? IFF_PROMISC : 0) < 0)
1021                         s->flags &= ~DEV_OPT_PROMISC;
1022         }
1023         if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
1024                 char buf[2];
1025
1026                 snprintf(buf, sizeof(buf), "%d", s->rpfilter);
1027                 system_set_rpfilter(dev, buf);
1028         }
1029         if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
1030                 system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
1031 }
1032
1033 int system_if_up(struct device *dev)
1034 {
1035         system_if_get_settings(dev, &dev->orig_settings);
1036         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
1037         return system_if_flags(dev->ifname, IFF_UP, 0);
1038 }
1039
1040 int system_if_down(struct device *dev)
1041 {
1042         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
1043         dev->orig_settings.flags &= dev->settings.flags;
1044         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
1045         return ret;
1046 }
1047
1048 struct if_check_data {
1049         struct device *dev;
1050         int pending;
1051         int ret;
1052 };
1053
1054 #ifndef IFF_LOWER_UP
1055 #define IFF_LOWER_UP    0x10000
1056 #endif
1057
1058 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1059 {
1060         struct nlmsghdr *nh = nlmsg_hdr(msg);
1061         struct ifinfomsg *ifi = NLMSG_DATA(nh);
1062         struct if_check_data *chk = (struct if_check_data *)arg;
1063
1064         if (nh->nlmsg_type != RTM_NEWLINK)
1065                 return NL_SKIP;
1066
1067         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1068         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1069
1070         return NL_OK;
1071 }
1072
1073 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1074 {
1075         struct if_check_data *chk = (struct if_check_data *)arg;
1076         chk->pending = 0;
1077         return NL_STOP;
1078 }
1079
1080 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1081 {
1082         struct if_check_data *chk = (struct if_check_data *)arg;
1083
1084         device_set_present(chk->dev, false);
1085         device_set_link(chk->dev, false);
1086         chk->pending = err->error;
1087
1088         return NL_STOP;
1089 }
1090
1091 int system_if_check(struct device *dev)
1092 {
1093         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1094         struct nl_msg *msg;
1095         struct ifinfomsg ifi = {
1096                 .ifi_family = AF_UNSPEC,
1097                 .ifi_index = 0,
1098         };
1099         struct if_check_data chk = {
1100                 .dev = dev,
1101                 .pending = 1,
1102         };
1103         int ret = 1;
1104
1105         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1106         if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1107             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1108                 goto out;
1109
1110         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1111         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1112         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1113
1114         nl_send_auto_complete(sock_rtnl, msg);
1115         while (chk.pending > 0)
1116                 nl_recvmsgs(sock_rtnl, cb);
1117
1118         nlmsg_free(msg);
1119         ret = chk.pending;
1120
1121 out:
1122         nl_cb_put(cb);
1123         return ret;
1124 }
1125
1126 struct device *
1127 system_if_get_parent(struct device *dev)
1128 {
1129         char buf[64], *devname;
1130         int ifindex, iflink, len;
1131         FILE *f;
1132
1133         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1134         f = fopen(buf, "r");
1135         if (!f)
1136                 return NULL;
1137
1138         len = fread(buf, 1, sizeof(buf) - 1, f);
1139         fclose(f);
1140
1141         if (len <= 0)
1142                 return NULL;
1143
1144         buf[len] = 0;
1145         iflink = strtoul(buf, NULL, 0);
1146         ifindex = system_if_resolve(dev);
1147         if (!iflink || iflink == ifindex)
1148                 return NULL;
1149
1150         devname = if_indextoname(iflink, buf);
1151         if (!devname)
1152                 return NULL;
1153
1154         return device_get(devname, true);
1155 }
1156
1157 static bool
1158 read_string_file(int dir_fd, const char *file, char *buf, int len)
1159 {
1160         bool ret = false;
1161         char *c;
1162         int fd;
1163
1164         fd = openat(dir_fd, file, O_RDONLY);
1165         if (fd < 0)
1166                 return false;
1167
1168 retry:
1169         len = read(fd, buf, len - 1);
1170         if (len < 0) {
1171                 if (errno == EINTR)
1172                         goto retry;
1173         } else if (len > 0) {
1174                         buf[len] = 0;
1175
1176                         c = strchr(buf, '\n');
1177                         if (c)
1178                                 *c = 0;
1179
1180                         ret = true;
1181         }
1182
1183         close(fd);
1184
1185         return ret;
1186 }
1187
1188 static bool
1189 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1190 {
1191         char buf[64];
1192         bool ret = false;
1193
1194         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1195         if (ret)
1196                 *val = strtoull(buf, NULL, 0);
1197
1198         return ret;
1199 }
1200
1201 /* Assume advertised flags == supported flags */
1202 static const struct {
1203         uint32_t mask;
1204         const char *name;
1205 } ethtool_link_modes[] = {
1206         { ADVERTISED_10baseT_Half, "10H" },
1207         { ADVERTISED_10baseT_Full, "10F" },
1208         { ADVERTISED_100baseT_Half, "100H" },
1209         { ADVERTISED_100baseT_Full, "100F" },
1210         { ADVERTISED_1000baseT_Half, "1000H" },
1211         { ADVERTISED_1000baseT_Full, "1000F" },
1212 };
1213
1214 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1215 {
1216         int i;
1217         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1218                 if (mask & ethtool_link_modes[i].mask)
1219                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1220         }
1221 }
1222
1223 bool
1224 system_if_force_external(const char *ifname)
1225 {
1226         char buf[64];
1227         struct stat s;
1228
1229         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1230         return stat(buf, &s) == 0;
1231 }
1232
1233 int
1234 system_if_dump_info(struct device *dev, struct blob_buf *b)
1235 {
1236         struct ethtool_cmd ecmd;
1237         struct ifreq ifr;
1238         char buf[64], *s;
1239         void *c;
1240         int dir_fd;
1241
1242         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1243         dir_fd = open(buf, O_DIRECTORY);
1244
1245         memset(&ecmd, 0, sizeof(ecmd));
1246         memset(&ifr, 0, sizeof(ifr));
1247         strcpy(ifr.ifr_name, dev->ifname);
1248         ifr.ifr_data = (caddr_t) &ecmd;
1249         ecmd.cmd = ETHTOOL_GSET;
1250
1251         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1252                 c = blobmsg_open_array(b, "link-advertising");
1253                 system_add_link_modes(b, ecmd.advertising);
1254                 blobmsg_close_array(b, c);
1255
1256                 c = blobmsg_open_array(b, "link-supported");
1257                 system_add_link_modes(b, ecmd.supported);
1258                 blobmsg_close_array(b, c);
1259
1260                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1261                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1262                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1263                 blobmsg_add_string_buffer(b);
1264         }
1265
1266         close(dir_fd);
1267         return 0;
1268 }
1269
1270 int
1271 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1272 {
1273         const char *const counters[] = {
1274                 "collisions",     "rx_frame_errors",   "tx_compressed",
1275                 "multicast",      "rx_length_errors",  "tx_dropped",
1276                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1277                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1278                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1279                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1280                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1281                 "rx_fifo_errors", "tx_carrier_errors",
1282         };
1283         char buf[64];
1284         int stats_dir;
1285         int i;
1286         uint64_t val = 0;
1287
1288         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1289         stats_dir = open(buf, O_DIRECTORY);
1290         if (stats_dir < 0)
1291                 return -1;
1292
1293         for (i = 0; i < ARRAY_SIZE(counters); i++)
1294                 if (read_uint64_file(stats_dir, counters[i], &val))
1295                         blobmsg_add_u64(b, counters[i], val);
1296
1297         close(stats_dir);
1298         return 0;
1299 }
1300
1301 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1302 {
1303         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1304         int alen = v4 ? 4 : 16;
1305         unsigned int flags = 0;
1306         struct ifaddrmsg ifa = {
1307                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1308                 .ifa_prefixlen = addr->mask,
1309                 .ifa_index = dev->ifindex,
1310         };
1311
1312         struct nl_msg *msg;
1313         if (cmd == RTM_NEWADDR)
1314                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1315
1316         msg = nlmsg_alloc_simple(cmd, flags);
1317         if (!msg)
1318                 return -1;
1319
1320         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1321         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1322         if (v4) {
1323                 if (addr->broadcast)
1324                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1325                 if (addr->point_to_point)
1326                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1327         } else {
1328                 time_t now = system_get_rtime();
1329                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1330
1331                 if (addr->preferred_until) {
1332                         int64_t preferred = addr->preferred_until - now;
1333                         if (preferred < 0)
1334                                 preferred = 0;
1335                         else if (preferred > UINT32_MAX)
1336                                 preferred = UINT32_MAX;
1337
1338                         cinfo.ifa_prefered = preferred;
1339                 }
1340
1341                 if (addr->valid_until) {
1342                         int64_t valid = addr->valid_until - now;
1343                         if (valid <= 0)
1344                                 return -1;
1345                         else if (valid > UINT32_MAX)
1346                                 valid = UINT32_MAX;
1347
1348                         cinfo.ifa_valid = valid;
1349                 }
1350
1351                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1352         }
1353
1354         return system_rtnl_call(msg);
1355 }
1356
1357 int system_add_address(struct device *dev, struct device_addr *addr)
1358 {
1359         return system_addr(dev, addr, RTM_NEWADDR);
1360 }
1361
1362 int system_del_address(struct device *dev, struct device_addr *addr)
1363 {
1364         return system_addr(dev, addr, RTM_DELADDR);
1365 }
1366
1367 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1368 {
1369         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1370         bool have_gw;
1371         unsigned int flags = 0;
1372
1373         if (alen == 4)
1374                 have_gw = !!route->nexthop.in.s_addr;
1375         else
1376                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1377                         route->nexthop.in6.s6_addr32[1] ||
1378                         route->nexthop.in6.s6_addr32[2] ||
1379                         route->nexthop.in6.s6_addr32[3];
1380
1381         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1382                         ? route->table : RT_TABLE_MAIN;
1383
1384         struct rtmsg rtm = {
1385                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1386                 .rtm_dst_len = route->mask,
1387                 .rtm_src_len = route->sourcemask,
1388                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1389                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1390                 .rtm_scope = RT_SCOPE_NOWHERE,
1391                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1392                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1393         };
1394         struct nl_msg *msg;
1395
1396         if (cmd == RTM_NEWROUTE) {
1397                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1398
1399                 if (!dev) { // Add null-route
1400                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1401                         rtm.rtm_type = RTN_UNREACHABLE;
1402                 }
1403                 else
1404                         rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1405         }
1406
1407         if (route->flags & DEVROUTE_TYPE) {
1408                 rtm.rtm_type = route->type;
1409                 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1410                         if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1411                             rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1412                                 rtm.rtm_table = RT_TABLE_LOCAL;
1413                 }
1414
1415                 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT) {
1416                         rtm.rtm_scope = RT_SCOPE_HOST;
1417                 } else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1418                                 rtm.rtm_type == RTN_ANYCAST) {
1419                         rtm.rtm_scope = RT_SCOPE_LINK;
1420                 } else if (rtm.rtm_type == RTN_BLACKHOLE || rtm.rtm_type == RTN_UNREACHABLE ||
1421                                 rtm.rtm_type == RTN_PROHIBIT || rtm.rtm_type == RTN_FAILED_POLICY) {
1422                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1423                         dev = NULL;
1424                 }
1425         }
1426
1427         msg = nlmsg_alloc_simple(cmd, flags);
1428         if (!msg)
1429                 return -1;
1430
1431         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1432
1433         if (route->mask)
1434                 nla_put(msg, RTA_DST, alen, &route->addr);
1435
1436         if (route->sourcemask)
1437                 nla_put(msg, RTA_SRC, alen, &route->source);
1438
1439         if (route->metric > 0)
1440                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1441
1442         if (have_gw)
1443                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1444
1445         if (dev)
1446                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1447
1448         if (table >= 256)
1449                 nla_put_u32(msg, RTA_TABLE, table);
1450
1451         if (route->flags & DEVROUTE_MTU) {
1452                 struct nlattr *metrics;
1453
1454                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1455                         goto nla_put_failure;
1456
1457                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1458
1459                 nla_nest_end(msg, metrics);
1460         }
1461
1462         return system_rtnl_call(msg);
1463
1464 nla_put_failure:
1465         nlmsg_free(msg);
1466         return -ENOMEM;
1467 }
1468
1469 int system_add_route(struct device *dev, struct device_route *route)
1470 {
1471         return system_rt(dev, route, RTM_NEWROUTE);
1472 }
1473
1474 int system_del_route(struct device *dev, struct device_route *route)
1475 {
1476         return system_rt(dev, route, RTM_DELROUTE);
1477 }
1478
1479 int system_flush_routes(void)
1480 {
1481         const char *names[] = {
1482                 "/proc/sys/net/ipv4/route/flush",
1483                 "/proc/sys/net/ipv6/route/flush"
1484         };
1485         int fd, i;
1486
1487         for (i = 0; i < ARRAY_SIZE(names); i++) {
1488                 fd = open(names[i], O_WRONLY);
1489                 if (fd < 0)
1490                         continue;
1491
1492                 if (write(fd, "-1", 2)) {}
1493                 close(fd);
1494         }
1495         return 0;
1496 }
1497
1498 bool system_resolve_rt_type(const char *type, unsigned int *id)
1499 {
1500         return system_rtn_aton(type, id);
1501 }
1502
1503 bool system_resolve_rt_table(const char *name, unsigned int *id)
1504 {
1505         FILE *f;
1506         char *e, buf[128];
1507         unsigned int n, table = RT_TABLE_UNSPEC;
1508
1509         /* first try to parse table as number */
1510         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1511                 table = n;
1512
1513         /* handle well known aliases */
1514         else if (!strcmp(name, "default"))
1515                 table = RT_TABLE_DEFAULT;
1516         else if (!strcmp(name, "main"))
1517                 table = RT_TABLE_MAIN;
1518         else if (!strcmp(name, "local"))
1519                 table = RT_TABLE_LOCAL;
1520
1521         /* try to look up name in /etc/iproute2/rt_tables */
1522         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1523         {
1524                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1525                 {
1526                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1527                                 continue;
1528
1529                         n = strtoul(e, NULL, 10);
1530                         e = strtok(NULL, " \t\n");
1531
1532                         if (e && !strcmp(e, name))
1533                         {
1534                                 table = n;
1535                                 break;
1536                         }
1537                 }
1538
1539                 fclose(f);
1540         }
1541
1542         if (table == RT_TABLE_UNSPEC)
1543                 return false;
1544
1545         *id = table;
1546         return true;
1547 }
1548
1549 bool system_is_default_rt_table(unsigned int id)
1550 {
1551         return (id == RT_TABLE_MAIN);
1552 }
1553
1554 bool system_resolve_rpfilter(const char *filter, unsigned int *id)
1555 {
1556         char *e;
1557         unsigned int n;
1558
1559         if (!strcmp(filter, "strict"))
1560                 n = 1;
1561         else if (!strcmp(filter, "loose"))
1562                 n = 2;
1563         else {
1564                 n = strtoul(filter, &e, 0);
1565                 if (*e || e == filter || n > 2)
1566                         return false;
1567         }
1568
1569         *id = n;
1570         return true;
1571 }
1572
1573 static int system_iprule(struct iprule *rule, int cmd)
1574 {
1575         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1576
1577         struct nl_msg *msg;
1578         struct rtmsg rtm = {
1579                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1580                 .rtm_protocol = RTPROT_STATIC,
1581                 .rtm_scope = RT_SCOPE_UNIVERSE,
1582                 .rtm_table = RT_TABLE_UNSPEC,
1583                 .rtm_type = RTN_UNSPEC,
1584                 .rtm_flags = 0,
1585         };
1586
1587         if (cmd == RTM_NEWRULE) {
1588                 rtm.rtm_type = RTN_UNICAST;
1589                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1590         }
1591
1592         if (rule->invert)
1593                 rtm.rtm_flags |= FIB_RULE_INVERT;
1594
1595         if (rule->flags & IPRULE_SRC)
1596                 rtm.rtm_src_len = rule->src_mask;
1597
1598         if (rule->flags & IPRULE_DEST)
1599                 rtm.rtm_dst_len = rule->dest_mask;
1600
1601         if (rule->flags & IPRULE_TOS)
1602                 rtm.rtm_tos = rule->tos;
1603
1604         if (rule->flags & IPRULE_LOOKUP) {
1605                 if (rule->lookup < 256)
1606                         rtm.rtm_table = rule->lookup;
1607         }
1608
1609         if (rule->flags & IPRULE_ACTION)
1610                 rtm.rtm_type = rule->action;
1611         else if (rule->flags & IPRULE_GOTO)
1612                 rtm.rtm_type = FR_ACT_GOTO;
1613         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1614                 rtm.rtm_type = FR_ACT_NOP;
1615
1616         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1617
1618         if (!msg)
1619                 return -1;
1620
1621         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1622
1623         if (rule->flags & IPRULE_IN)
1624                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1625
1626         if (rule->flags & IPRULE_OUT)
1627                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1628
1629         if (rule->flags & IPRULE_SRC)
1630                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1631
1632         if (rule->flags & IPRULE_DEST)
1633                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1634
1635         if (rule->flags & IPRULE_PRIORITY)
1636                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1637         else if (cmd == RTM_NEWRULE)
1638                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1639
1640         if (rule->flags & IPRULE_FWMARK)
1641                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1642
1643         if (rule->flags & IPRULE_FWMASK)
1644                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1645
1646         if (rule->flags & IPRULE_LOOKUP) {
1647                 if (rule->lookup >= 256)
1648                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1649         }
1650
1651         if (rule->flags & IPRULE_GOTO)
1652                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1653
1654         return system_rtnl_call(msg);
1655 }
1656
1657 int system_add_iprule(struct iprule *rule)
1658 {
1659         return system_iprule(rule, RTM_NEWRULE);
1660 }
1661
1662 int system_del_iprule(struct iprule *rule)
1663 {
1664         return system_iprule(rule, RTM_DELRULE);
1665 }
1666
1667 int system_flush_iprules(void)
1668 {
1669         int rv = 0;
1670         struct iprule rule;
1671
1672         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1673         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1674
1675         memset(&rule, 0, sizeof(rule));
1676
1677
1678         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1679
1680         rule.priority = 0;
1681         rule.lookup = RT_TABLE_LOCAL;
1682         rv |= system_iprule(&rule, RTM_NEWRULE);
1683
1684         rule.priority = 32766;
1685         rule.lookup = RT_TABLE_MAIN;
1686         rv |= system_iprule(&rule, RTM_NEWRULE);
1687
1688         rule.priority = 32767;
1689         rule.lookup = RT_TABLE_DEFAULT;
1690         rv |= system_iprule(&rule, RTM_NEWRULE);
1691
1692
1693         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1694
1695         rule.priority = 0;
1696         rule.lookup = RT_TABLE_LOCAL;
1697         rv |= system_iprule(&rule, RTM_NEWRULE);
1698
1699         rule.priority = 32766;
1700         rule.lookup = RT_TABLE_MAIN;
1701         rv |= system_iprule(&rule, RTM_NEWRULE);
1702
1703         return rv;
1704 }
1705
1706 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1707 {
1708         return system_rtn_aton(action, id);
1709 }
1710
1711 time_t system_get_rtime(void)
1712 {
1713         struct timespec ts;
1714         struct timeval tv;
1715
1716         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1717                 return ts.tv_sec;
1718
1719         if (gettimeofday(&tv, NULL) == 0)
1720                 return tv.tv_sec;
1721
1722         return 0;
1723 }
1724
1725 #ifndef IP_DF
1726 #define IP_DF       0x4000
1727 #endif
1728
1729 static int tunnel_ioctl(const char *name, int cmd, void *p)
1730 {
1731         struct ifreq ifr;
1732
1733         memset(&ifr, 0, sizeof(ifr));
1734         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1735         ifr.ifr_ifru.ifru_data = p;
1736         return ioctl(sock_ioctl, cmd, &ifr);
1737 }
1738
1739 #ifdef IFLA_IPTUN_MAX
1740 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
1741 static int system_add_gre_tunnel(const char *name, const char *kind,
1742                                  const unsigned int link, struct blob_attr **tb, bool v6)
1743 {
1744         struct nl_msg *nlm;
1745         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
1746         struct blob_attr *cur;
1747         uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
1748         uint16_t iflags = 0, oflags = 0;
1749         uint8_t tos = 0;
1750         int ret = 0, ttl = 64;
1751
1752         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1753         if (!nlm)
1754                 return -1;
1755
1756         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1757         nla_put_string(nlm, IFLA_IFNAME, name);
1758
1759         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1760         if (!linkinfo) {
1761                 ret = -ENOMEM;
1762                 goto failure;
1763         }
1764
1765         nla_put_string(nlm, IFLA_INFO_KIND, kind);
1766         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1767         if (!infodata) {
1768                 ret = -ENOMEM;
1769                 goto failure;
1770         }
1771
1772         if (link)
1773                 nla_put_u32(nlm, IFLA_GRE_LINK, link);
1774
1775         if ((cur = tb[TUNNEL_ATTR_TTL]))
1776                 ttl = blobmsg_get_u32(cur);
1777
1778         nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
1779
1780         if ((cur = tb[TUNNEL_ATTR_TOS])) {
1781                 char *str = blobmsg_get_string(cur);
1782                 if (strcmp(str, "inherit")) {
1783                         unsigned uval;
1784
1785                         if (!system_tos_aton(str, &uval)) {
1786                                 ret = -EINVAL;
1787                                 goto failure;
1788                         }
1789
1790                         if (v6)
1791                                 flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
1792                         else
1793                                 tos = uval;
1794                 } else {
1795                         if (v6)
1796                                 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
1797                         else
1798                                 tos = 1;
1799                 }
1800         }
1801
1802         if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
1803                 uint8_t icsum, ocsum, iseqno, oseqno;
1804                 if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
1805                         &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
1806                         ret = -EINVAL;
1807                         goto failure;
1808                 }
1809
1810                 if (ikey)
1811                         iflags |= GRE_KEY;
1812
1813                 if (okey)
1814                         oflags |= GRE_KEY;
1815
1816                 if (icsum)
1817                         iflags |= GRE_CSUM;
1818
1819                 if (ocsum)
1820                         oflags |= GRE_CSUM;
1821
1822                 if (iseqno)
1823                         iflags |= GRE_SEQ;
1824
1825                 if (oseqno)
1826                         oflags |= GRE_SEQ;
1827         }
1828
1829         if (v6) {
1830                 struct in6_addr in6buf;
1831                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1832                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1833                                 ret = -EINVAL;
1834                                 goto failure;
1835                         }
1836                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
1837                 }
1838
1839                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1840                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1841                                 ret = -EINVAL;
1842                                 goto failure;
1843                         }
1844                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
1845                 }
1846                 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
1847
1848                 if (flowinfo)
1849                         nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
1850
1851                 if (flags)
1852                         nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
1853         } else {
1854                 struct in_addr inbuf;
1855                 bool set_df = true;
1856
1857                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1858                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1859                                 ret = -EINVAL;
1860                                 goto failure;
1861                         }
1862                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
1863                 }
1864
1865                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1866                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
1867                                 ret = -EINVAL;
1868                                 goto failure;
1869                         }
1870                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
1871
1872                         if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
1873                                 if (!okey) {
1874                                         okey = inbuf.s_addr;
1875                                         oflags |= GRE_KEY;
1876                                 }
1877
1878                                 if (!ikey) {
1879                                         ikey = inbuf.s_addr;
1880                                         iflags |= GRE_KEY;
1881                                 }
1882                         }
1883                 }
1884
1885                 if ((cur = tb[TUNNEL_ATTR_DF]))
1886                         set_df = blobmsg_get_bool(cur);
1887
1888                 /* ttl !=0 and nopmtudisc are incompatible */
1889                 if (ttl && !set_df) {
1890                         ret = -EINVAL;
1891                         goto failure;
1892                 }
1893
1894                 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
1895
1896                 nla_put_u8(nlm, IFLA_GRE_TOS, tos);
1897         }
1898
1899         if (oflags)
1900                 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
1901
1902         if (iflags)
1903                 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
1904
1905         if (okey)
1906                 nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
1907
1908         if (ikey)
1909                 nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
1910
1911         nla_nest_end(nlm, infodata);
1912         nla_nest_end(nlm, linkinfo);
1913
1914         return system_rtnl_call(nlm);
1915
1916 failure:
1917         nlmsg_free(nlm);
1918         return ret;
1919 }
1920 #endif
1921
1922 static int system_add_proto_tunnel(const char *name, const uint8_t proto, const unsigned int link, struct blob_attr **tb)
1923 {
1924         struct blob_attr *cur;
1925         bool set_df = true;
1926         struct ip_tunnel_parm p  = {
1927                 .link = link,
1928                 .iph = {
1929                         .version = 4,
1930                         .ihl = 5,
1931                         .protocol = proto,
1932                 }
1933         };
1934
1935         if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1936                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1937                 return -EINVAL;
1938
1939         if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1940                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1941                 return -EINVAL;
1942
1943         if ((cur = tb[TUNNEL_ATTR_DF]))
1944                 set_df = blobmsg_get_bool(cur);
1945
1946         if ((cur = tb[TUNNEL_ATTR_TTL]))
1947                 p.iph.ttl = blobmsg_get_u32(cur);
1948
1949         if ((cur = tb[TUNNEL_ATTR_TOS])) {
1950                 char *str = blobmsg_get_string(cur);
1951                 if (strcmp(str, "inherit")) {
1952                         unsigned uval;
1953
1954                         if (!system_tos_aton(str, &uval))
1955                                 return -EINVAL;
1956
1957                         p.iph.tos = uval;
1958                 } else
1959                         p.iph.tos = 1;
1960         }
1961
1962         p.iph.frag_off = set_df ? htons(IP_DF) : 0;
1963         /* ttl !=0 and nopmtudisc are incompatible */
1964         if (p.iph.ttl && p.iph.frag_off == 0)
1965                 return -EINVAL;
1966
1967         strncpy(p.name, name, sizeof(p.name));
1968
1969         switch (p.iph.protocol) {
1970         case IPPROTO_IPIP:
1971                 return tunnel_ioctl("tunl0", SIOCADDTUNNEL, &p);
1972         case IPPROTO_IPV6:
1973                 return tunnel_ioctl("sit0", SIOCADDTUNNEL, &p);
1974         default:
1975                 break;
1976         }
1977         return -1;
1978 }
1979
1980 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
1981 {
1982         struct blob_attr *cur;
1983         const char *str;
1984
1985         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1986                 return -EINVAL;
1987         str = blobmsg_data(cur);
1988
1989         if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
1990             !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
1991                 return system_link_del(name);
1992         else
1993                 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1994 }
1995
1996 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
1997 {
1998         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1999
2000         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2001                 blob_data(attr), blob_len(attr));
2002
2003         return __system_del_ip_tunnel(name, tb);
2004 }
2005
2006 int system_update_ipv6_mtu(struct device *dev, int mtu)
2007 {
2008         int ret = -1;
2009         char buf[64];
2010         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
2011                         dev->ifname);
2012
2013         int fd = open(buf, O_RDWR);
2014         ssize_t len = read(fd, buf, sizeof(buf) - 1);
2015         if (len < 0)
2016                 goto out;
2017
2018         buf[len] = 0;
2019         ret = atoi(buf);
2020
2021         if (!mtu || ret <= mtu)
2022                 goto out;
2023
2024         lseek(fd, 0, SEEK_SET);
2025         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
2026                 ret = -1;
2027
2028 out:
2029         close(fd);
2030         return ret;
2031 }
2032
2033 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
2034 {
2035         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2036         struct blob_attr *cur;
2037         const char *str;
2038
2039         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2040                 blob_data(attr), blob_len(attr));
2041
2042         __system_del_ip_tunnel(name, tb);
2043
2044         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2045                 return -EINVAL;
2046         str = blobmsg_data(cur);
2047
2048         unsigned int ttl = 0;
2049         if ((cur = tb[TUNNEL_ATTR_TTL])) {
2050                 ttl = blobmsg_get_u32(cur);
2051                 if (ttl > 255)
2052                         return -EINVAL;
2053         }
2054
2055         unsigned int link = 0;
2056         if ((cur = tb[TUNNEL_ATTR_LINK])) {
2057                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
2058                 if (!iface)
2059                         return -EINVAL;
2060
2061                 if (iface->l3_dev.dev)
2062                         link = iface->l3_dev.dev->ifindex;
2063         }
2064
2065         if (!strcmp(str, "sit")) {
2066                 if (system_add_proto_tunnel(name, IPPROTO_IPV6, link, tb) < 0)
2067                         return -1;
2068
2069 #ifdef SIOCADD6RD
2070                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
2071                         unsigned int mask;
2072                         struct ip_tunnel_6rd p6;
2073
2074                         memset(&p6, 0, sizeof(p6));
2075
2076                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
2077                                                 &p6.prefix, &mask) || mask > 128)
2078                                 return -EINVAL;
2079                         p6.prefixlen = mask;
2080
2081                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
2082                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
2083                                                         &p6.relay_prefix, &mask) || mask > 32)
2084                                         return -EINVAL;
2085                                 p6.relay_prefixlen = mask;
2086                         }
2087
2088                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
2089                                 __system_del_ip_tunnel(name, tb);
2090                                 return -1;
2091                         }
2092                 }
2093 #endif
2094 #ifdef IFLA_IPTUN_MAX
2095         } else if (!strcmp(str, "ipip6")) {
2096                 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
2097                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2098                 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
2099                 int ret = 0;
2100
2101                 if (!nlm)
2102                         return -1;
2103
2104                 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2105                 nla_put_string(nlm, IFLA_IFNAME, name);
2106
2107                 if (link)
2108                         nla_put_u32(nlm, IFLA_LINK, link);
2109
2110                 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2111                 if (!linkinfo) {
2112                         ret = -ENOMEM;
2113                         goto failure;
2114                 }
2115                 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
2116                 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2117                 if (!infodata) {
2118                         ret = -ENOMEM;
2119                         goto failure;
2120                 }
2121
2122                 if (link)
2123                         nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
2124
2125                 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
2126                 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
2127                 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
2128
2129                 struct in6_addr in6buf;
2130                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2131                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2132                                 ret = -EINVAL;
2133                                 goto failure;
2134                         }
2135                         nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
2136                 }
2137
2138                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2139                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2140                                 ret = -EINVAL;
2141                                 goto failure;
2142                         }
2143                         nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
2144                 }
2145
2146 #ifdef IFLA_IPTUN_FMR_MAX
2147                 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
2148                         struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
2149
2150                         struct blob_attr *fmr;
2151                         unsigned rem, fmrcnt = 0;
2152                         blobmsg_for_each_attr(fmr, cur, rem) {
2153                                 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
2154                                         continue;
2155
2156                                 unsigned ip4len, ip6len, ealen, offset = 6;
2157                                 char ip6buf[48];
2158                                 char ip4buf[16];
2159
2160                                 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
2161                                                 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
2162                                         ret = -EINVAL;
2163                                         goto failure;
2164                                 }
2165
2166                                 struct in6_addr ip6prefix;
2167                                 struct in_addr ip4prefix;
2168                                 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
2169                                                 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
2170                                         ret = -EINVAL;
2171                                         goto failure;
2172                                 }
2173
2174                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2175
2176                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2177                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2178                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2179                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2180                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2181                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2182
2183                                 nla_nest_end(nlm, rule);
2184                         }
2185
2186                         nla_nest_end(nlm, fmrs);
2187                 }
2188 #endif
2189
2190                 nla_nest_end(nlm, infodata);
2191                 nla_nest_end(nlm, linkinfo);
2192
2193                 return system_rtnl_call(nlm);
2194 failure:
2195                 nlmsg_free(nlm);
2196                 return ret;
2197         } else if (!strcmp(str, "greip")) {
2198                 return system_add_gre_tunnel(name, "gre", link, tb, false);
2199         } else if (!strcmp(str, "gretapip"))  {
2200                 return system_add_gre_tunnel(name, "gretap", link, tb, false);
2201         } else if (!strcmp(str, "greip6")) {
2202                 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
2203         } else if (!strcmp(str, "gretapip6")) {
2204                 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
2205 #endif
2206         } else if (!strcmp(str, "ipip")) {
2207                 return system_add_proto_tunnel(name, IPPROTO_IPIP, link, tb);
2208         }
2209         else
2210                 return -EINVAL;
2211
2212         return 0;
2213 }