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_addr.h>
  34 #include <linux/if_link.h>
  35 #include <linux/if_vlan.h>
  36 #include <linux/if_bridge.h>
  37 #include <linux/if_tunnel.h>
  38 #include <linux/ip6_tunnel.h>
  39 #include <linux/ethtool.h>
  40 #include <linux/fib_rules.h>
  41 #include <linux/version.h>
  42
  43 #ifndef RTN_FAILED_POLICY
  44 #define RTN_FAILED_POLICY 12
  45 #endif
  46
  47 #ifndef RT_TABLE_PRELOCAL
  48 #define RT_TABLE_PRELOCAL 128
  49 #endif
  50
  51 #ifndef IFA_F_NOPREFIXROUTE
  52 #define IFA_F_NOPREFIXROUTE 0x200
  53 #endif
  54
  55 #ifndef IFA_FLAGS
  56 #define IFA_FLAGS (IFA_MULTICAST + 1)
  57 #endif
  58
  59
  60 #include <string.h>
  61 #include <fcntl.h>
  62 #include <glob.h>
  63 #include <time.h>
  64 #include <unistd.h>
  65
  66 #include <netlink/msg.h>
  67 #include <netlink/attr.h>
  68 #include <netlink/socket.h>
  69 #include <libubox/uloop.h>
  70
  71 #include "netifd.h"
  72 #include "device.h"
  73 #include "system.h"
  74
  75 struct event_socket {
  76         struct uloop_fd uloop;
  77         struct nl_sock *sock;
  78         int bufsize;
  79 };
  80
  81 static int sock_ioctl = -1;
  82 static struct nl_sock *sock_rtnl = NULL;
  83
  84 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  85 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  86
  87 static char dev_buf[256];
  88
  89 static void
  90 handler_nl_event(struct uloop_fd *u, unsigned int events)
  91 {
  92         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  93         int err;
  94         socklen_t errlen = sizeof(err);
  95
  96         if (!u->error) {
  97                 nl_recvmsgs_default(ev->sock);
  98                 return;
  99         }
 100
 101         if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
 102                 goto abort;
 103
 104         switch(err) {
 105         case ENOBUFS:
 106                 // Increase rx buffer size on netlink socket
 107                 ev->bufsize *= 2;
 108                 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 109                         goto abort;
 110
 111                 // Request full dump since some info got dropped
 112                 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
 113                 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
 114                 break;
 115
 116         default:
 117                 goto abort;
 118         }
 119         u->error = false;
 120         return;
 121
 122 abort:
 123         uloop_fd_delete(&ev->uloop);
 124         return;
 125 }
 126
 127 static struct nl_sock *
 128 create_socket(int protocol, int groups)
 129 {
 130         struct nl_sock *sock;
 131
 132         sock = nl_socket_alloc();
 133         if (!sock)
 134                 return NULL;
 135
 136         if (groups)
 137                 nl_join_groups(sock, groups);
 138
 139         if (nl_connect(sock, protocol))
 140                 return NULL;
 141
 142         return sock;
 143 }
 144
 145 static bool
 146 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
 147                         uloop_fd_handler cb, int flags)
 148 {
 149         ev->sock = create_socket(protocol, groups);
 150         if (!ev->sock)
 151                 return false;
 152
 153         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 154         ev->uloop.cb = cb;
 155         if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
 156                 return false;
 157
 158         return true;
 159 }
 160
 161 static bool
 162 create_event_socket(struct event_socket *ev, int protocol,
 163                     int (*cb)(struct nl_msg *msg, void *arg))
 164 {
 165         if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
 166                 return false;
 167
 168         // Install the valid custom callback handler
 169         nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 170
 171         // Disable sequence number checking on event sockets
 172         nl_socket_disable_seq_check(ev->sock);
 173
 174         // Increase rx buffer size to 65K on event sockets
 175         ev->bufsize = 65535;
 176         if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 177                 return false;
 178
 179         return true;
 180 }
 181
 182 static bool
 183 system_rtn_aton(const char *src, unsigned int *dst)
 184 {
 185         char *e;
 186         unsigned int n;
 187
 188         if (!strcmp(src, "local"))
 189                 n = RTN_LOCAL;
 190         else if (!strcmp(src, "nat"))
 191                 n = RTN_NAT;
 192         else if (!strcmp(src, "broadcast"))
 193                 n = RTN_BROADCAST;
 194         else if (!strcmp(src, "anycast"))
 195                 n = RTN_ANYCAST;
 196         else if (!strcmp(src, "multicast"))
 197                 n = RTN_MULTICAST;
 198         else if (!strcmp(src, "prohibit"))
 199                 n = RTN_PROHIBIT;
 200         else if (!strcmp(src, "unreachable"))
 201                 n = RTN_UNREACHABLE;
 202         else if (!strcmp(src, "blackhole"))
 203                 n = RTN_BLACKHOLE;
 204         else if (!strcmp(src, "xresolve"))
 205                 n = RTN_XRESOLVE;
 206         else if (!strcmp(src, "unicast"))
 207                 n = RTN_UNICAST;
 208         else if (!strcmp(src, "throw"))
 209                 n = RTN_THROW;
 210         else if (!strcmp(src, "failed_policy"))
 211                 n = RTN_FAILED_POLICY;
 212         else {
 213                 n = strtoul(src, &e, 0);
 214                 if (!e || *e || e == src || n > 255)
 215                         return false;
 216         }
 217
 218         *dst = n;
 219         return true;
 220 }
 221
 222 static bool
 223 system_tos_aton(const char *src, unsigned *dst)
 224 {
 225         char *e;
 226
 227         *dst = strtoul(src, &e, 16);
 228         if (e == src || *e || *dst > 255)
 229                 return false;
 230
 231         return true;
 232 }
 233
 234 int system_init(void)
 235 {
 236         static struct event_socket rtnl_event;
 237         static struct event_socket hotplug_event;
 238
 239         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 240         system_fd_set_cloexec(sock_ioctl);
 241
 242         // Prepare socket for routing / address control
 243         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 244         if (!sock_rtnl)
 245                 return -1;
 246
 247         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 248                 return -1;
 249
 250         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 251                                      handle_hotplug_event, 0))
 252                 return -1;
 253
 254         // Receive network link events form kernel
 255         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 256
 257         return 0;
 258 }
 259
 260 static void system_set_sysctl(const char *path, const char *val)
 261 {
 262         int fd;
 263
 264         fd = open(path, O_WRONLY);
 265         if (fd < 0)
 266                 return;
 267
 268         if (write(fd, val, strlen(val))) {}
 269         close(fd);
 270 }
 271
 272 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 273 {
 274         snprintf(dev_buf, sizeof(dev_buf), path, device);
 275         system_set_sysctl(dev_buf, val);
 276 }
 277
 278 static void system_set_disable_ipv6(struct device *dev, const char *val)
 279 {
 280         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 281 }
 282
 283 static void system_set_rpfilter(struct device *dev, const char *val)
 284 {
 285         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter", dev->ifname, val);
 286 }
 287
 288 static void system_set_acceptlocal(struct device *dev, const char *val)
 289 {
 290         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local", dev->ifname, val);
 291 }
 292
 293 static void system_set_igmpversion(struct device *dev, const char *val)
 294 {
 295         system_set_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version", dev->ifname, val);
 296 }
 297
 298 static void system_set_mldversion(struct device *dev, const char *val)
 299 {
 300         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version", dev->ifname, val);
 301 }
 302
 303 static void system_set_neigh4reachabletime(struct device *dev, const char *val)
 304 {
 305         system_set_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms", dev->ifname, val);
 306 }
 307
 308 static void system_set_neigh6reachabletime(struct device *dev, const char *val)
 309 {
 310         system_set_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms", dev->ifname, val);
 311 }
 312
 313 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 314 {
 315         int fd = -1, ret = -1;
 316
 317         fd = open(path, O_RDONLY);
 318         if (fd < 0)
 319                 goto out;
 320
 321         ssize_t len = read(fd, buf, buf_sz - 1);
 322         if (len < 0)
 323                 goto out;
 324
 325         ret = buf[len] = 0;
 326
 327 out:
 328         if (fd >= 0)
 329                 close(fd);
 330
 331         return ret;
 332 }
 333
 334 static int
 335 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
 336 {
 337         snprintf(dev_buf, sizeof(dev_buf), path, device);
 338         return system_get_sysctl(dev_buf, buf, buf_sz);
 339 }
 340
 341 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
 342 {
 343         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
 344                         dev->ifname, buf, buf_sz);
 345 }
 346
 347 static int system_get_rpfilter(struct device *dev, char *buf, const size_t buf_sz)
 348 {
 349         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/rp_filter",
 350                         dev->ifname, buf, buf_sz);
 351 }
 352
 353 static int system_get_acceptlocal(struct device *dev, char *buf, const size_t buf_sz)
 354 {
 355         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/accept_local",
 356                         dev->ifname, buf, buf_sz);
 357 }
 358
 359 static int system_get_igmpversion(struct device *dev, char *buf, const size_t buf_sz)
 360 {
 361         return system_get_dev_sysctl("/proc/sys/net/ipv4/conf/%s/force_igmp_version",
 362                         dev->ifname, buf, buf_sz);
 363 }
 364
 365 static int system_get_mldversion(struct device *dev, char *buf, const size_t buf_sz)
 366 {
 367         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/force_mld_version",
 368                         dev->ifname, buf, buf_sz);
 369 }
 370
 371 static int system_get_neigh4reachabletime(struct device *dev, char *buf, const size_t buf_sz)
 372 {
 373         return system_get_dev_sysctl("/proc/sys/net/ipv4/neigh/%s/base_reachable_time_ms",
 374                         dev->ifname, buf, buf_sz);
 375 }
 376
 377 static int system_get_neigh6reachabletime(struct device *dev, char *buf, const size_t buf_sz)
 378 {
 379         return system_get_dev_sysctl("/proc/sys/net/ipv6/neigh/%s/base_reachable_time_ms",
 380                         dev->ifname, buf, buf_sz);
 381 }
 382
 383 // Evaluate netlink messages
 384 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 385 {
 386         struct nlmsghdr *nh = nlmsg_hdr(msg);
 387         struct nlattr *nla[__IFLA_MAX];
 388         int link_state = 0;
 389         char buf[10];
 390
 391         if (nh->nlmsg_type != RTM_NEWLINK)
 392                 goto out;
 393
 394         nlmsg_parse(nh, sizeof(struct ifinfomsg), nla, __IFLA_MAX - 1, NULL);
 395         if (!nla[IFLA_IFNAME])
 396                 goto out;
 397
 398         struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
 399         if (!dev || dev->type->keep_link_status)
 400                 goto out;
 401
 402         if (!system_get_dev_sysctl("/sys/class/net/%s/carrier", dev->ifname, buf, sizeof(buf)))
 403                 link_state = strtoul(buf, NULL, 0);
 404
 405         device_set_link(dev, link_state ? true : false);
 406
 407 out:
 408         return 0;
 409 }
 410
 411 static void
 412 handle_hotplug_msg(char *data, int size)
 413 {
 414         const char *subsystem = NULL, *interface = NULL;
 415         char *cur, *end, *sep;
 416         struct device *dev;
 417         int skip;
 418         bool add;
 419
 420         if (!strncmp(data, "add@", 4))
 421                 add = true;
 422         else if (!strncmp(data, "remove@", 7))
 423                 add = false;
 424         else
 425                 return;
 426
 427         skip = strlen(data) + 1;
 428         end = data + size;
 429
 430         for (cur = data + skip; cur < end; cur += skip) {
 431                 skip = strlen(cur) + 1;
 432
 433                 sep = strchr(cur, '=');
 434                 if (!sep)
 435                         continue;
 436
 437                 *sep = 0;
 438                 if (!strcmp(cur, "INTERFACE"))
 439                         interface = sep + 1;
 440                 else if (!strcmp(cur, "SUBSYSTEM")) {
 441                         subsystem = sep + 1;
 442                         if (strcmp(subsystem, "net") != 0)
 443                                 return;
 444                 }
 445                 if (subsystem && interface)
 446                         goto found;
 447         }
 448         return;
 449
 450 found:
 451         dev = device_get(interface, false);
 452         if (!dev)
 453                 return;
 454
 455         if (dev->type != &simple_device_type)
 456                 return;
 457
 458         if (add && system_if_force_external(dev->ifname))
 459                 return;
 460
 461         device_set_present(dev, add);
 462 }
 463
 464 static void
 465 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 466 {
 467         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 468         struct sockaddr_nl nla;
 469         unsigned char *buf = NULL;
 470         int size;
 471
 472         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 473                 if (nla.nl_pid == 0)
 474                         handle_hotplug_msg((char *) buf, size);
 475
 476                 free(buf);
 477         }
 478 }
 479
 480 static int system_rtnl_call(struct nl_msg *msg)
 481 {
 482         int ret;
 483
 484         ret = nl_send_auto_complete(sock_rtnl, msg);
 485         nlmsg_free(msg);
 486
 487         if (ret < 0)
 488                 return ret;
 489
 490         return nl_wait_for_ack(sock_rtnl);
 491 }
 492
 493 int system_bridge_delbr(struct device *bridge)
 494 {
 495         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 496 }
 497
 498 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 499 {
 500         struct ifreq ifr;
 501
 502         memset(&ifr, 0, sizeof(ifr));
 503         if (dev)
 504                 ifr.ifr_ifindex = dev->ifindex;
 505         else
 506                 ifr.ifr_data = data;
 507         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 508         return ioctl(sock_ioctl, cmd, &ifr);
 509 }
 510
 511 static bool system_is_bridge(const char *name, char *buf, int buflen)
 512 {
 513         struct stat st;
 514
 515         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 516         if (stat(buf, &st) < 0)
 517                 return false;
 518
 519         return true;
 520 }
 521
 522 static char *system_get_bridge(const char *name, char *buf, int buflen)
 523 {
 524         char *path;
 525         ssize_t len = -1;
 526         glob_t gl;
 527
 528         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 529         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 530                 return NULL;
 531
 532         if (gl.gl_pathc > 0)
 533                 len = readlink(gl.gl_pathv[0], buf, buflen);
 534
 535         globfree(&gl);
 536
 537         if (len < 0)
 538                 return NULL;
 539
 540         buf[len] = 0;
 541         path = strrchr(buf, '/');
 542         if (!path)
 543                 return NULL;
 544
 545         return path + 1;
 546 }
 547
 548 static void system_bridge_set_wireless(const char *bridge, const char *dev)
 549 {
 550         snprintf(dev_buf, sizeof(dev_buf),
 551                  "/sys/devices/virtual/net/%s/brif/%s/multicast_to_unicast",
 552                  bridge, dev);
 553         system_set_sysctl(dev_buf, "1");
 554 }
 555
 556 int system_bridge_addif(struct device *bridge, struct device *dev)
 557 {
 558         char *oldbr;
 559         int ret = 0;
 560
 561         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 562         if (!oldbr || strcmp(oldbr, bridge->ifname) != 0)
 563                 ret = system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 564
 565         if (dev->wireless)
 566                 system_bridge_set_wireless(bridge->ifname, dev->ifname);
 567
 568         return ret;
 569 }
 570
 571 int system_bridge_delif(struct device *bridge, struct device *dev)
 572 {
 573         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 574 }
 575
 576 int system_if_resolve(struct device *dev)
 577 {
 578         struct ifreq ifr;
 579         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 580         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 581                 return ifr.ifr_ifindex;
 582         else
 583                 return 0;
 584 }
 585
 586 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 587 {
 588         struct ifreq ifr;
 589
 590         memset(&ifr, 0, sizeof(ifr));
 591         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 592         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 593         ifr.ifr_flags |= add;
 594         ifr.ifr_flags &= ~rem;
 595         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 596 }
 597
 598 struct clear_data {
 599         struct nl_msg *msg;
 600         struct device *dev;
 601         int type;
 602         int size;
 603         int af;
 604 };
 605
 606
 607 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 608 {
 609         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 610
 611         return ifa->ifa_index == ifindex;
 612 }
 613
 614 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 615 {
 616         struct rtmsg *r = NLMSG_DATA(hdr);
 617         struct nlattr *tb[__RTA_MAX];
 618
 619         if (r->rtm_protocol == RTPROT_KERNEL &&
 620             r->rtm_family == AF_INET6)
 621                 return false;
 622
 623         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 624         if (!tb[RTA_OIF])
 625                 return false;
 626
 627         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 628 }
 629
 630 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 631 {
 632         return true;
 633 }
 634
 635 static int cb_clear_event(struct nl_msg *msg, void *arg)
 636 {
 637         struct clear_data *clr = arg;
 638         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 639         bool (*cb)(struct nlmsghdr *, int ifindex);
 640         int type;
 641
 642         switch(clr->type) {
 643         case RTM_GETADDR:
 644                 type = RTM_DELADDR;
 645                 if (hdr->nlmsg_type != RTM_NEWADDR)
 646                         return NL_SKIP;
 647
 648                 cb = check_ifaddr;
 649                 break;
 650         case RTM_GETROUTE:
 651                 type = RTM_DELROUTE;
 652                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 653                         return NL_SKIP;
 654
 655                 cb = check_route;
 656                 break;
 657         case RTM_GETRULE:
 658                 type = RTM_DELRULE;
 659                 if (hdr->nlmsg_type != RTM_NEWRULE)
 660                         return NL_SKIP;
 661
 662                 cb = check_rule;
 663                 break;
 664         default:
 665                 return NL_SKIP;
 666         }
 667
 668         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 669                 return NL_SKIP;
 670
 671         if (type == RTM_DELRULE)
 672                 D(SYSTEM, "Remove a rule\n");
 673         else
 674                 D(SYSTEM, "Remove %s from device %s\n",
 675                   type == RTM_DELADDR ? "an address" : "a route",
 676                   clr->dev->ifname);
 677         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 678         hdr = nlmsg_hdr(clr->msg);
 679         hdr->nlmsg_type = type;
 680         hdr->nlmsg_flags = NLM_F_REQUEST;
 681
 682         nl_socket_disable_auto_ack(sock_rtnl);
 683         nl_send_auto_complete(sock_rtnl, clr->msg);
 684         nl_socket_enable_auto_ack(sock_rtnl);
 685
 686         return NL_SKIP;
 687 }
 688
 689 static int
 690 cb_finish_event(struct nl_msg *msg, void *arg)
 691 {
 692         int *pending = arg;
 693         *pending = 0;
 694         return NL_STOP;
 695 }
 696
 697 static int
 698 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 699 {
 700         int *pending = arg;
 701         *pending = err->error;
 702         return NL_STOP;
 703 }
 704
 705 static void
 706 system_if_clear_entries(struct device *dev, int type, int af)
 707 {
 708         struct clear_data clr;
 709         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 710         struct rtmsg rtm = {
 711                 .rtm_family = af,
 712                 .rtm_flags = RTM_F_CLONED,
 713         };
 714         int flags = NLM_F_DUMP;
 715         int pending = 1;
 716
 717         clr.af = af;
 718         clr.dev = dev;
 719         clr.type = type;
 720         switch (type) {
 721         case RTM_GETADDR:
 722         case RTM_GETRULE:
 723                 clr.size = sizeof(struct rtgenmsg);
 724                 break;
 725         case RTM_GETROUTE:
 726                 clr.size = sizeof(struct rtmsg);
 727                 break;
 728         default:
 729                 return;
 730         }
 731
 732         if (!cb)
 733                 return;
 734
 735         clr.msg = nlmsg_alloc_simple(type, flags);
 736         if (!clr.msg)
 737                 goto out;
 738
 739         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 740         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 741         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 742         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 743
 744         nl_send_auto_complete(sock_rtnl, clr.msg);
 745         while (pending > 0)
 746                 nl_recvmsgs(sock_rtnl, cb);
 747
 748         nlmsg_free(clr.msg);
 749 out:
 750         nl_cb_put(cb);
 751 }
 752
 753 /*
 754  * Clear bridge (membership) state and bring down device
 755  */
 756 void system_if_clear_state(struct device *dev)
 757 {
 758         static char buf[256];
 759         char *bridge;
 760
 761         device_set_ifindex(dev, system_if_resolve(dev));
 762         if (dev->external || !dev->ifindex)
 763                 return;
 764
 765         system_if_flags(dev->ifname, 0, IFF_UP);
 766
 767         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 768                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 769                 system_bridge_delbr(dev);
 770                 return;
 771         }
 772
 773         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 774         if (bridge) {
 775                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 776                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 777         }
 778
 779         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 780         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 781         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 782         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 783         system_set_disable_ipv6(dev, "0");
 784 }
 785
 786 static inline unsigned long
 787 sec_to_jiffies(int val)
 788 {
 789         return (unsigned long) val * 100;
 790 }
 791
 792 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 793 {
 794         char buf[64];
 795         unsigned long args[4] = {};
 796
 797         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 798                 return -1;
 799
 800         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 801         args[1] = !!cfg->stp;
 802         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 803
 804         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 805         args[1] = sec_to_jiffies(cfg->forward_delay);
 806         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 807
 808         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 809                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 810
 811         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_querier",
 812                 bridge->ifname, cfg->multicast_querier ? "1" : "0");
 813
 814         snprintf(buf, sizeof(buf), "%i", cfg->hash_max);
 815         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/hash_max",
 816                 bridge->ifname, buf);
 817
 818         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 819         args[1] = cfg->priority;
 820         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 821
 822         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 823                 args[0] = BRCTL_SET_AGEING_TIME;
 824                 args[1] = sec_to_jiffies(cfg->ageing_time);
 825                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 826         }
 827
 828         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 829                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 830                 args[1] = sec_to_jiffies(cfg->hello_time);
 831                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 832         }
 833
 834         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 835                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 836                 args[1] = sec_to_jiffies(cfg->max_age);
 837                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 838         }
 839
 840         return 0;
 841 }
 842
 843 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
 844 {
 845         struct nl_msg *msg;
 846         struct nlattr *linkinfo, *data;
 847         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC, };
 848         int i, rv;
 849         static const struct {
 850                 const char *name;
 851                 enum macvlan_mode val;
 852         } modes[] = {
 853                 { "private", MACVLAN_MODE_PRIVATE },
 854                 { "vepa", MACVLAN_MODE_VEPA },
 855                 { "bridge", MACVLAN_MODE_BRIDGE },
 856                 { "passthru", MACVLAN_MODE_PASSTHRU },
 857         };
 858
 859         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 860
 861         if (!msg)
 862                 return -1;
 863
 864         nlmsg_append(msg, &iim, sizeof(iim), 0);
 865
 866         if (cfg->flags & MACVLAN_OPT_MACADDR)
 867                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
 868         nla_put_string(msg, IFLA_IFNAME, macvlan->ifname);
 869         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
 870
 871         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 872                 goto nla_put_failure;
 873
 874         nla_put_string(msg, IFLA_INFO_KIND, "macvlan");
 875
 876         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 877                 goto nla_put_failure;
 878
 879         if (cfg->mode) {
 880                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
 881                         if (strcmp(cfg->mode, modes[i].name) != 0)
 882                                 continue;
 883
 884                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
 885                         break;
 886                 }
 887         }
 888
 889         nla_nest_end(msg, data);
 890         nla_nest_end(msg, linkinfo);
 891
 892         rv = system_rtnl_call(msg);
 893         if (rv)
 894                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
 895
 896         return rv;
 897
 898 nla_put_failure:
 899         nlmsg_free(msg);
 900         return -ENOMEM;
 901 }
 902
 903 static int system_link_del(const char *ifname)
 904 {
 905         struct nl_msg *msg;
 906         struct ifinfomsg iim = {
 907                 .ifi_family = AF_UNSPEC,
 908                 .ifi_index = 0,
 909         };
 910
 911         msg = nlmsg_alloc_simple(RTM_DELLINK, NLM_F_REQUEST);
 912
 913         if (!msg)
 914                 return -1;
 915
 916         nlmsg_append(msg, &iim, sizeof(iim), 0);
 917         nla_put_string(msg, IFLA_IFNAME, ifname);
 918         return system_rtnl_call(msg);
 919 }
 920
 921 int system_macvlan_del(struct device *macvlan)
 922 {
 923         return system_link_del(macvlan->ifname);
 924 }
 925
 926 static int system_vlan(struct device *dev, int id)
 927 {
 928         struct vlan_ioctl_args ifr = {
 929                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 930                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 931         };
 932
 933         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 934
 935         if (id < 0) {
 936                 ifr.cmd = DEL_VLAN_CMD;
 937                 ifr.u.VID = 0;
 938         } else {
 939                 ifr.cmd = ADD_VLAN_CMD;
 940                 ifr.u.VID = id;
 941         }
 942         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 943         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 944 }
 945
 946 int system_vlan_add(struct device *dev, int id)
 947 {
 948         return system_vlan(dev, id);
 949 }
 950
 951 int system_vlan_del(struct device *dev)
 952 {
 953         return system_vlan(dev, -1);
 954 }
 955
 956 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
 957 {
 958         struct nl_msg *msg;
 959         struct nlattr *linkinfo, *data;
 960         struct ifinfomsg iim = { .ifi_family = AF_UNSPEC };
 961         int rv;
 962
 963         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 964
 965         if (!msg)
 966                 return -1;
 967
 968         nlmsg_append(msg, &iim, sizeof(iim), 0);
 969         nla_put_string(msg, IFLA_IFNAME, vlandev->ifname);
 970         nla_put_u32(msg, IFLA_LINK, dev->ifindex);
 971
 972         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 973                 goto nla_put_failure;
 974
 975         nla_put_string(msg, IFLA_INFO_KIND, "vlan");
 976
 977         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 978                 goto nla_put_failure;
 979
 980         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
 981
 982 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
 983         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
 984 #else
 985         if(cfg->proto == VLAN_PROTO_8021AD)
 986                 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);
 987 #endif
 988
 989         nla_nest_end(msg, data);
 990         nla_nest_end(msg, linkinfo);
 991
 992         rv = system_rtnl_call(msg);
 993         if (rv)
 994                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
 995
 996         return rv;
 997
 998 nla_put_failure:
 999         nlmsg_free(msg);
1000         return -ENOMEM;
1001 }
1002
1003 int system_vlandev_del(struct device *vlandev)
1004 {
1005         return system_link_del(vlandev->ifname);
1006 }
1007
1008 static void
1009 system_if_get_settings(struct device *dev, struct device_settings *s)
1010 {
1011         struct ifreq ifr;
1012         char buf[10];
1013
1014         memset(&ifr, 0, sizeof(ifr));
1015         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1016
1017         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
1018                 s->mtu = ifr.ifr_mtu;
1019                 s->flags |= DEV_OPT_MTU;
1020         }
1021
1022         s->mtu6 = system_update_ipv6_mtu(dev, 0);
1023         if (s->mtu6 > 0)
1024                 s->flags |= DEV_OPT_MTU6;
1025
1026         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
1027                 s->txqueuelen = ifr.ifr_qlen;
1028                 s->flags |= DEV_OPT_TXQUEUELEN;
1029         }
1030
1031         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
1032                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
1033                 s->flags |= DEV_OPT_MACADDR;
1034         }
1035
1036         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
1037                 s->ipv6 = !strtoul(buf, NULL, 0);
1038                 s->flags |= DEV_OPT_IPV6;
1039         }
1040
1041         if (ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr) == 0) {
1042                 s->promisc = ifr.ifr_flags & IFF_PROMISC;
1043                 s->flags |= DEV_OPT_PROMISC;
1044         }
1045
1046         if (!system_get_rpfilter(dev, buf, sizeof(buf))) {
1047                 s->rpfilter = strtoul(buf, NULL, 0);
1048                 s->flags |= DEV_OPT_RPFILTER;
1049         }
1050
1051         if (!system_get_acceptlocal(dev, buf, sizeof(buf))) {
1052                 s->acceptlocal = strtoul(buf, NULL, 0);
1053                 s->flags |= DEV_OPT_ACCEPTLOCAL;
1054         }
1055
1056         if (!system_get_igmpversion(dev, buf, sizeof(buf))) {
1057                 s->igmpversion = strtoul(buf, NULL, 0);
1058                 s->flags |= DEV_OPT_IGMPVERSION;
1059         }
1060
1061         if (!system_get_mldversion(dev, buf, sizeof(buf))) {
1062                 s->mldversion = strtoul(buf, NULL, 0);
1063                 s->flags |= DEV_OPT_MLDVERSION;
1064         }
1065
1066         if (!system_get_neigh4reachabletime(dev, buf, sizeof(buf))) {
1067                 s->neigh4reachabletime = strtoul(buf, NULL, 0);
1068                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1069         }
1070
1071         if (!system_get_neigh6reachabletime(dev, buf, sizeof(buf))) {
1072                 s->neigh6reachabletime = strtoul(buf, NULL, 0);
1073                 s->flags |= DEV_OPT_NEIGHREACHABLETIME;
1074         }
1075 }
1076
1077 static void
1078 system_if_set_rps_xps_val(const char *path, int val)
1079 {
1080         char val_buf[8];
1081         glob_t gl;
1082         int i;
1083
1084         if (glob(path, 0, NULL, &gl))
1085                 return;
1086
1087         snprintf(val_buf, sizeof(val_buf), "%x", val);
1088         for (i = 0; i < gl.gl_pathc; i++)
1089                 system_set_sysctl(gl.gl_pathv[i], val_buf);
1090 }
1091
1092 static void
1093 system_if_apply_rps_xps(struct device *dev, struct device_settings *s)
1094 {
1095         long n_cpus = sysconf(_SC_NPROCESSORS_ONLN);
1096         int val;
1097
1098         if (n_cpus < 2)
1099                 return;
1100
1101         val = (1 << n_cpus) - 1;
1102         snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/rps_cpus", dev->ifname);
1103         system_if_set_rps_xps_val(dev_buf, s->rps ? val : 0);
1104
1105         snprintf(dev_buf, sizeof(dev_buf), "/sys/class/net/%s/queues/*/xps_cpus", dev->ifname);
1106         system_if_set_rps_xps_val(dev_buf, s->xps ? val : 0);
1107 }
1108
1109 void
1110 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
1111 {
1112         struct ifreq ifr;
1113
1114         memset(&ifr, 0, sizeof(ifr));
1115         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
1116         if (s->flags & DEV_OPT_MTU & apply_mask) {
1117                 ifr.ifr_mtu = s->mtu;
1118                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
1119                         s->flags &= ~DEV_OPT_MTU;
1120         }
1121         if (s->flags & DEV_OPT_MTU6 & apply_mask) {
1122                 system_update_ipv6_mtu(dev, s->mtu6);
1123         }
1124         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
1125                 ifr.ifr_qlen = s->txqueuelen;
1126                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
1127                         s->flags &= ~DEV_OPT_TXQUEUELEN;
1128         }
1129         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
1130                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
1131                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
1132                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
1133                         s->flags &= ~DEV_OPT_MACADDR;
1134         }
1135         if (s->flags & DEV_OPT_IPV6 & apply_mask)
1136                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
1137         if (s->flags & DEV_OPT_PROMISC & apply_mask) {
1138                 if (system_if_flags(dev->ifname, s->promisc ? IFF_PROMISC : 0,
1139                                     !s->promisc ? IFF_PROMISC : 0) < 0)
1140                         s->flags &= ~DEV_OPT_PROMISC;
1141         }
1142         if (s->flags & DEV_OPT_RPFILTER & apply_mask) {
1143                 char buf[2];
1144
1145                 snprintf(buf, sizeof(buf), "%d", s->rpfilter);
1146                 system_set_rpfilter(dev, buf);
1147         }
1148         if (s->flags & DEV_OPT_ACCEPTLOCAL & apply_mask)
1149                 system_set_acceptlocal(dev, s->acceptlocal ? "1" : "0");
1150         if (s->flags & DEV_OPT_IGMPVERSION & apply_mask) {
1151                 char buf[2];
1152
1153                 snprintf(buf, sizeof(buf), "%d", s->igmpversion);
1154                 system_set_igmpversion(dev, buf);
1155         }
1156         if (s->flags & DEV_OPT_MLDVERSION & apply_mask) {
1157                 char buf[2];
1158
1159                 snprintf(buf, sizeof(buf), "%d", s->mldversion);
1160                 system_set_mldversion(dev, buf);
1161         }
1162         if (s->flags & DEV_OPT_NEIGHREACHABLETIME & apply_mask) {
1163                 char buf[12];
1164
1165                 snprintf(buf, sizeof(buf), "%d", s->neigh4reachabletime);
1166                 system_set_neigh4reachabletime(dev, buf);
1167                 snprintf(buf, sizeof(buf), "%d", s->neigh6reachabletime);
1168                 system_set_neigh6reachabletime(dev, buf);
1169         }
1170
1171         system_if_apply_rps_xps(dev, s);
1172 }
1173
1174 int system_if_up(struct device *dev)
1175 {
1176         system_if_get_settings(dev, &dev->orig_settings);
1177         /* Only keep orig settings based on what needs to be set */
1178         dev->orig_settings.flags &= dev->settings.flags;
1179         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
1180         return system_if_flags(dev->ifname, IFF_UP, 0);
1181 }
1182
1183 int system_if_down(struct device *dev)
1184 {
1185         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
1186         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
1187         return ret;
1188 }
1189
1190 struct if_check_data {
1191         struct device *dev;
1192         int pending;
1193         int ret;
1194 };
1195
1196 #ifndef IFF_LOWER_UP
1197 #define IFF_LOWER_UP    0x10000
1198 #endif
1199
1200 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
1201 {
1202         struct nlmsghdr *nh = nlmsg_hdr(msg);
1203         struct ifinfomsg *ifi = NLMSG_DATA(nh);
1204         struct if_check_data *chk = (struct if_check_data *)arg;
1205
1206         if (nh->nlmsg_type != RTM_NEWLINK)
1207                 return NL_SKIP;
1208
1209         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
1210         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
1211
1212         return NL_OK;
1213 }
1214
1215 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
1216 {
1217         struct if_check_data *chk = (struct if_check_data *)arg;
1218         chk->pending = 0;
1219         return NL_STOP;
1220 }
1221
1222 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
1223 {
1224         struct if_check_data *chk = (struct if_check_data *)arg;
1225
1226         device_set_present(chk->dev, false);
1227         device_set_link(chk->dev, false);
1228         chk->pending = err->error;
1229
1230         return NL_STOP;
1231 }
1232
1233 int system_if_check(struct device *dev)
1234 {
1235         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1236         struct nl_msg *msg;
1237         struct ifinfomsg ifi = {
1238                 .ifi_family = AF_UNSPEC,
1239                 .ifi_index = 0,
1240         };
1241         struct if_check_data chk = {
1242                 .dev = dev,
1243                 .pending = 1,
1244         };
1245         int ret = 1;
1246
1247         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1248         if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1249             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1250                 goto out;
1251
1252         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1253         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1254         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1255
1256         nl_send_auto_complete(sock_rtnl, msg);
1257         while (chk.pending > 0)
1258                 nl_recvmsgs(sock_rtnl, cb);
1259
1260         nlmsg_free(msg);
1261         ret = chk.pending;
1262
1263 out:
1264         nl_cb_put(cb);
1265         return ret;
1266 }
1267
1268 struct device *
1269 system_if_get_parent(struct device *dev)
1270 {
1271         char buf[64], *devname;
1272         int ifindex, iflink, len;
1273         FILE *f;
1274
1275         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1276         f = fopen(buf, "r");
1277         if (!f)
1278                 return NULL;
1279
1280         len = fread(buf, 1, sizeof(buf) - 1, f);
1281         fclose(f);
1282
1283         if (len <= 0)
1284                 return NULL;
1285
1286         buf[len] = 0;
1287         iflink = strtoul(buf, NULL, 0);
1288         ifindex = system_if_resolve(dev);
1289         if (!iflink || iflink == ifindex)
1290                 return NULL;
1291
1292         devname = if_indextoname(iflink, buf);
1293         if (!devname)
1294                 return NULL;
1295
1296         return device_get(devname, true);
1297 }
1298
1299 static bool
1300 read_string_file(int dir_fd, const char *file, char *buf, int len)
1301 {
1302         bool ret = false;
1303         char *c;
1304         int fd;
1305
1306         fd = openat(dir_fd, file, O_RDONLY);
1307         if (fd < 0)
1308                 return false;
1309
1310 retry:
1311         len = read(fd, buf, len - 1);
1312         if (len < 0) {
1313                 if (errno == EINTR)
1314                         goto retry;
1315         } else if (len > 0) {
1316                         buf[len] = 0;
1317
1318                         c = strchr(buf, '\n');
1319                         if (c)
1320                                 *c = 0;
1321
1322                         ret = true;
1323         }
1324
1325         close(fd);
1326
1327         return ret;
1328 }
1329
1330 static bool
1331 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1332 {
1333         char buf[64];
1334         bool ret = false;
1335
1336         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1337         if (ret)
1338                 *val = strtoull(buf, NULL, 0);
1339
1340         return ret;
1341 }
1342
1343 /* Assume advertised flags == supported flags */
1344 static const struct {
1345         uint32_t mask;
1346         const char *name;
1347 } ethtool_link_modes[] = {
1348         { ADVERTISED_10baseT_Half, "10H" },
1349         { ADVERTISED_10baseT_Full, "10F" },
1350         { ADVERTISED_100baseT_Half, "100H" },
1351         { ADVERTISED_100baseT_Full, "100F" },
1352         { ADVERTISED_1000baseT_Half, "1000H" },
1353         { ADVERTISED_1000baseT_Full, "1000F" },
1354 };
1355
1356 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1357 {
1358         int i;
1359         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1360                 if (mask & ethtool_link_modes[i].mask)
1361                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1362         }
1363 }
1364
1365 bool
1366 system_if_force_external(const char *ifname)
1367 {
1368         char buf[64];
1369         struct stat s;
1370
1371         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1372         return stat(buf, &s) == 0;
1373 }
1374
1375 int
1376 system_if_dump_info(struct device *dev, struct blob_buf *b)
1377 {
1378         struct ethtool_cmd ecmd;
1379         struct ifreq ifr;
1380         char buf[64], *s;
1381         void *c;
1382         int dir_fd;
1383
1384         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1385         dir_fd = open(buf, O_DIRECTORY);
1386
1387         memset(&ecmd, 0, sizeof(ecmd));
1388         memset(&ifr, 0, sizeof(ifr));
1389         strcpy(ifr.ifr_name, dev->ifname);
1390         ifr.ifr_data = (caddr_t) &ecmd;
1391         ecmd.cmd = ETHTOOL_GSET;
1392
1393         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1394                 c = blobmsg_open_array(b, "link-advertising");
1395                 system_add_link_modes(b, ecmd.advertising);
1396                 blobmsg_close_array(b, c);
1397
1398                 c = blobmsg_open_array(b, "link-supported");
1399                 system_add_link_modes(b, ecmd.supported);
1400                 blobmsg_close_array(b, c);
1401
1402                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1403                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1404                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1405                 blobmsg_add_string_buffer(b);
1406         }
1407
1408         close(dir_fd);
1409         return 0;
1410 }
1411
1412 int
1413 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1414 {
1415         const char *const counters[] = {
1416                 "collisions",     "rx_frame_errors",   "tx_compressed",
1417                 "multicast",      "rx_length_errors",  "tx_dropped",
1418                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1419                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1420                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1421                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1422                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1423                 "rx_fifo_errors", "tx_carrier_errors",
1424         };
1425         char buf[64];
1426         int stats_dir;
1427         int i;
1428         uint64_t val = 0;
1429
1430         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1431         stats_dir = open(buf, O_DIRECTORY);
1432         if (stats_dir < 0)
1433                 return -1;
1434
1435         for (i = 0; i < ARRAY_SIZE(counters); i++)
1436                 if (read_uint64_file(stats_dir, counters[i], &val))
1437                         blobmsg_add_u64(b, counters[i], val);
1438
1439         close(stats_dir);
1440         return 0;
1441 }
1442
1443 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1444 {
1445         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1446         int alen = v4 ? 4 : 16;
1447         unsigned int flags = 0;
1448         struct ifaddrmsg ifa = {
1449                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1450                 .ifa_prefixlen = addr->mask,
1451                 .ifa_index = dev->ifindex,
1452         };
1453
1454         struct nl_msg *msg;
1455         if (cmd == RTM_NEWADDR)
1456                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1457
1458         msg = nlmsg_alloc_simple(cmd, flags);
1459         if (!msg)
1460                 return -1;
1461
1462         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1463         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1464         if (v4) {
1465                 if (addr->broadcast)
1466                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1467                 if (addr->point_to_point)
1468                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1469         } else {
1470                 time_t now = system_get_rtime();
1471                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1472
1473                 if (addr->preferred_until) {
1474                         int64_t preferred = addr->preferred_until - now;
1475                         if (preferred < 0)
1476                                 preferred = 0;
1477                         else if (preferred > UINT32_MAX)
1478                                 preferred = UINT32_MAX;
1479
1480                         cinfo.ifa_prefered = preferred;
1481                 }
1482
1483                 if (addr->valid_until) {
1484                         int64_t valid = addr->valid_until - now;
1485                         if (valid <= 0)
1486                                 return -1;
1487                         else if (valid > UINT32_MAX)
1488                                 valid = UINT32_MAX;
1489
1490                         cinfo.ifa_valid = valid;
1491                 }
1492
1493                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1494
1495                 if (cmd == RTM_NEWADDR && (addr->flags & DEVADDR_OFFLINK))
1496                         nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE);
1497         }
1498
1499         return system_rtnl_call(msg);
1500 }
1501
1502 int system_add_address(struct device *dev, struct device_addr *addr)
1503 {
1504         return system_addr(dev, addr, RTM_NEWADDR);
1505 }
1506
1507 int system_del_address(struct device *dev, struct device_addr *addr)
1508 {
1509         return system_addr(dev, addr, RTM_DELADDR);
1510 }
1511
1512 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1513 {
1514         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1515         bool have_gw;
1516         unsigned int flags = 0;
1517
1518         if (alen == 4)
1519                 have_gw = !!route->nexthop.in.s_addr;
1520         else
1521                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1522                         route->nexthop.in6.s6_addr32[1] ||
1523                         route->nexthop.in6.s6_addr32[2] ||
1524                         route->nexthop.in6.s6_addr32[3];
1525
1526         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1527                         ? route->table : RT_TABLE_MAIN;
1528
1529         struct rtmsg rtm = {
1530                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1531                 .rtm_dst_len = route->mask,
1532                 .rtm_src_len = route->sourcemask,
1533                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1534                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1535                 .rtm_scope = RT_SCOPE_NOWHERE,
1536                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1537                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1538         };
1539         struct nl_msg *msg;
1540
1541         if (cmd == RTM_NEWROUTE) {
1542                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1543
1544                 if (!dev) { // Add null-route
1545                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1546                         rtm.rtm_type = RTN_UNREACHABLE;
1547                 }
1548                 else
1549                         rtm.rtm_scope = (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1550         }
1551
1552         if (route->flags & DEVROUTE_TYPE) {
1553                 rtm.rtm_type = route->type;
1554                 if (!(route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))) {
1555                         if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_BROADCAST ||
1556                             rtm.rtm_type == RTN_NAT || rtm.rtm_type == RTN_ANYCAST)
1557                                 rtm.rtm_table = RT_TABLE_LOCAL;
1558                 }
1559
1560                 if (rtm.rtm_type == RTN_LOCAL || rtm.rtm_type == RTN_NAT) {
1561                         rtm.rtm_scope = RT_SCOPE_HOST;
1562                 } else if (rtm.rtm_type == RTN_BROADCAST || rtm.rtm_type == RTN_MULTICAST ||
1563                                 rtm.rtm_type == RTN_ANYCAST) {
1564                         rtm.rtm_scope = RT_SCOPE_LINK;
1565                 } else if (rtm.rtm_type == RTN_BLACKHOLE || rtm.rtm_type == RTN_UNREACHABLE ||
1566                                 rtm.rtm_type == RTN_PROHIBIT || rtm.rtm_type == RTN_FAILED_POLICY) {
1567                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1568                         dev = NULL;
1569                 }
1570         }
1571
1572         msg = nlmsg_alloc_simple(cmd, flags);
1573         if (!msg)
1574                 return -1;
1575
1576         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1577
1578         if (route->mask)
1579                 nla_put(msg, RTA_DST, alen, &route->addr);
1580
1581         if (route->sourcemask) {
1582                 if (rtm.rtm_family == AF_INET)
1583                         nla_put(msg, RTA_PREFSRC, alen, &route->source);
1584                 else
1585                         nla_put(msg, RTA_SRC, alen, &route->source);
1586         }
1587
1588         if (route->metric > 0)
1589                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1590
1591         if (have_gw)
1592                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1593
1594         if (dev)
1595                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1596
1597         if (table >= 256)
1598                 nla_put_u32(msg, RTA_TABLE, table);
1599
1600         if (route->flags & DEVROUTE_MTU) {
1601                 struct nlattr *metrics;
1602
1603                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1604                         goto nla_put_failure;
1605
1606                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1607
1608                 nla_nest_end(msg, metrics);
1609         }
1610
1611         return system_rtnl_call(msg);
1612
1613 nla_put_failure:
1614         nlmsg_free(msg);
1615         return -ENOMEM;
1616 }
1617
1618 int system_add_route(struct device *dev, struct device_route *route)
1619 {
1620         return system_rt(dev, route, RTM_NEWROUTE);
1621 }
1622
1623 int system_del_route(struct device *dev, struct device_route *route)
1624 {
1625         return system_rt(dev, route, RTM_DELROUTE);
1626 }
1627
1628 int system_flush_routes(void)
1629 {
1630         const char *names[] = {
1631                 "/proc/sys/net/ipv4/route/flush",
1632                 "/proc/sys/net/ipv6/route/flush"
1633         };
1634         int fd, i;
1635
1636         for (i = 0; i < ARRAY_SIZE(names); i++) {
1637                 fd = open(names[i], O_WRONLY);
1638                 if (fd < 0)
1639                         continue;
1640
1641                 if (write(fd, "-1", 2)) {}
1642                 close(fd);
1643         }
1644         return 0;
1645 }
1646
1647 bool system_resolve_rt_type(const char *type, unsigned int *id)
1648 {
1649         return system_rtn_aton(type, id);
1650 }
1651
1652 bool system_resolve_rt_table(const char *name, unsigned int *id)
1653 {
1654         FILE *f;
1655         char *e, buf[128];
1656         unsigned int n, table = RT_TABLE_UNSPEC;
1657
1658         /* first try to parse table as number */
1659         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1660                 table = n;
1661
1662         /* handle well known aliases */
1663         else if (!strcmp(name, "default"))
1664                 table = RT_TABLE_DEFAULT;
1665         else if (!strcmp(name, "main"))
1666                 table = RT_TABLE_MAIN;
1667         else if (!strcmp(name, "local"))
1668                 table = RT_TABLE_LOCAL;
1669         else if (!strcmp(name, "prelocal"))
1670                 table = RT_TABLE_PRELOCAL;
1671
1672         /* try to look up name in /etc/iproute2/rt_tables */
1673         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1674         {
1675                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1676                 {
1677                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1678                                 continue;
1679
1680                         n = strtoul(e, NULL, 10);
1681                         e = strtok(NULL, " \t\n");
1682
1683                         if (e && !strcmp(e, name))
1684                         {
1685                                 table = n;
1686                                 break;
1687                         }
1688                 }
1689
1690                 fclose(f);
1691         }
1692
1693         if (table == RT_TABLE_UNSPEC)
1694                 return false;
1695
1696         *id = table;
1697         return true;
1698 }
1699
1700 bool system_is_default_rt_table(unsigned int id)
1701 {
1702         return (id == RT_TABLE_MAIN);
1703 }
1704
1705 bool system_resolve_rpfilter(const char *filter, unsigned int *id)
1706 {
1707         char *e;
1708         unsigned int n;
1709
1710         if (!strcmp(filter, "strict"))
1711                 n = 1;
1712         else if (!strcmp(filter, "loose"))
1713                 n = 2;
1714         else {
1715                 n = strtoul(filter, &e, 0);
1716                 if (*e || e == filter || n > 2)
1717                         return false;
1718         }
1719
1720         *id = n;
1721         return true;
1722 }
1723
1724 static int system_iprule(struct iprule *rule, int cmd)
1725 {
1726         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1727
1728         struct nl_msg *msg;
1729         struct rtmsg rtm = {
1730                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1731                 .rtm_protocol = RTPROT_STATIC,
1732                 .rtm_scope = RT_SCOPE_UNIVERSE,
1733                 .rtm_table = RT_TABLE_UNSPEC,
1734                 .rtm_type = RTN_UNSPEC,
1735                 .rtm_flags = 0,
1736         };
1737
1738         if (cmd == RTM_NEWRULE) {
1739                 rtm.rtm_type = RTN_UNICAST;
1740                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1741         }
1742
1743         if (rule->invert)
1744                 rtm.rtm_flags |= FIB_RULE_INVERT;
1745
1746         if (rule->flags & IPRULE_SRC)
1747                 rtm.rtm_src_len = rule->src_mask;
1748
1749         if (rule->flags & IPRULE_DEST)
1750                 rtm.rtm_dst_len = rule->dest_mask;
1751
1752         if (rule->flags & IPRULE_TOS)
1753                 rtm.rtm_tos = rule->tos;
1754
1755         if (rule->flags & IPRULE_LOOKUP) {
1756                 if (rule->lookup < 256)
1757                         rtm.rtm_table = rule->lookup;
1758         }
1759
1760         if (rule->flags & IPRULE_ACTION)
1761                 rtm.rtm_type = rule->action;
1762         else if (rule->flags & IPRULE_GOTO)
1763                 rtm.rtm_type = FR_ACT_GOTO;
1764         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1765                 rtm.rtm_type = FR_ACT_NOP;
1766
1767         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1768
1769         if (!msg)
1770                 return -1;
1771
1772         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1773
1774         if (rule->flags & IPRULE_IN)
1775                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1776
1777         if (rule->flags & IPRULE_OUT)
1778                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1779
1780         if (rule->flags & IPRULE_SRC)
1781                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1782
1783         if (rule->flags & IPRULE_DEST)
1784                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1785
1786         if (rule->flags & IPRULE_PRIORITY)
1787                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1788         else if (cmd == RTM_NEWRULE)
1789                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1790
1791         if (rule->flags & IPRULE_FWMARK)
1792                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1793
1794         if (rule->flags & IPRULE_FWMASK)
1795                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1796
1797         if (rule->flags & IPRULE_LOOKUP) {
1798                 if (rule->lookup >= 256)
1799                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1800         }
1801
1802         if (rule->flags & IPRULE_GOTO)
1803                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1804
1805         return system_rtnl_call(msg);
1806 }
1807
1808 int system_add_iprule(struct iprule *rule)
1809 {
1810         return system_iprule(rule, RTM_NEWRULE);
1811 }
1812
1813 int system_del_iprule(struct iprule *rule)
1814 {
1815         return system_iprule(rule, RTM_DELRULE);
1816 }
1817
1818 int system_flush_iprules(void)
1819 {
1820         int rv = 0;
1821         struct iprule rule;
1822
1823         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1824         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1825
1826         memset(&rule, 0, sizeof(rule));
1827
1828
1829         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1830
1831         rule.priority = 0;
1832         rule.lookup = RT_TABLE_PRELOCAL;
1833         rv |= system_iprule(&rule, RTM_NEWRULE);
1834
1835         rule.priority = 1;
1836         rule.lookup = RT_TABLE_LOCAL;
1837         rv |= system_iprule(&rule, RTM_NEWRULE);
1838
1839         rule.priority = 32766;
1840         rule.lookup = RT_TABLE_MAIN;
1841         rv |= system_iprule(&rule, RTM_NEWRULE);
1842
1843         rule.priority = 32767;
1844         rule.lookup = RT_TABLE_DEFAULT;
1845         rv |= system_iprule(&rule, RTM_NEWRULE);
1846
1847
1848         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1849
1850         rule.priority = 0;
1851         rule.lookup = RT_TABLE_PRELOCAL;
1852         rv |= system_iprule(&rule, RTM_NEWRULE);
1853
1854         rule.priority = 1;
1855         rule.lookup = RT_TABLE_LOCAL;
1856         rv |= system_iprule(&rule, RTM_NEWRULE);
1857
1858         rule.priority = 32766;
1859         rule.lookup = RT_TABLE_MAIN;
1860         rv |= system_iprule(&rule, RTM_NEWRULE);
1861
1862         return rv;
1863 }
1864
1865 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1866 {
1867         return system_rtn_aton(action, id);
1868 }
1869
1870 time_t system_get_rtime(void)
1871 {
1872         struct timespec ts;
1873         struct timeval tv;
1874
1875         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1876                 return ts.tv_sec;
1877
1878         if (gettimeofday(&tv, NULL) == 0)
1879                 return tv.tv_sec;
1880
1881         return 0;
1882 }
1883
1884 #ifndef IP_DF
1885 #define IP_DF       0x4000
1886 #endif
1887
1888 static int tunnel_ioctl(const char *name, int cmd, void *p)
1889 {
1890         struct ifreq ifr;
1891
1892         memset(&ifr, 0, sizeof(ifr));
1893         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1894         ifr.ifr_ifru.ifru_data = p;
1895         return ioctl(sock_ioctl, cmd, &ifr);
1896 }
1897
1898 #ifdef IFLA_IPTUN_MAX
1899 #define IP6_FLOWINFO_TCLASS     htonl(0x0FF00000)
1900 static int system_add_gre_tunnel(const char *name, const char *kind,
1901                                  const unsigned int link, struct blob_attr **tb, bool v6)
1902 {
1903         struct nl_msg *nlm;
1904         struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC, };
1905         struct blob_attr *cur;
1906         uint32_t ikey = 0, okey = 0, flags = 0, flowinfo = 0;
1907         uint16_t iflags = 0, oflags = 0;
1908         uint8_t tos = 0;
1909         int ret = 0, ttl = 64;
1910
1911         nlm = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1912         if (!nlm)
1913                 return -1;
1914
1915         nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1916         nla_put_string(nlm, IFLA_IFNAME, name);
1917
1918         struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1919         if (!linkinfo) {
1920                 ret = -ENOMEM;
1921                 goto failure;
1922         }
1923
1924         nla_put_string(nlm, IFLA_INFO_KIND, kind);
1925         struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1926         if (!infodata) {
1927                 ret = -ENOMEM;
1928                 goto failure;
1929         }
1930
1931         if (link)
1932                 nla_put_u32(nlm, IFLA_GRE_LINK, link);
1933
1934         if ((cur = tb[TUNNEL_ATTR_TTL]))
1935                 ttl = blobmsg_get_u32(cur);
1936
1937         nla_put_u8(nlm, IFLA_GRE_TTL, ttl);
1938
1939         if ((cur = tb[TUNNEL_ATTR_TOS])) {
1940                 char *str = blobmsg_get_string(cur);
1941                 if (strcmp(str, "inherit")) {
1942                         unsigned uval;
1943
1944                         if (!system_tos_aton(str, &uval)) {
1945                                 ret = -EINVAL;
1946                                 goto failure;
1947                         }
1948
1949                         if (v6)
1950                                 flowinfo |= htonl(uval << 20) & IP6_FLOWINFO_TCLASS;
1951                         else
1952                                 tos = uval;
1953                 } else {
1954                         if (v6)
1955                                 flags |= IP6_TNL_F_USE_ORIG_TCLASS;
1956                         else
1957                                 tos = 1;
1958                 }
1959         }
1960
1961         if ((cur = tb[TUNNEL_ATTR_INFO]) && (blobmsg_type(cur) == BLOBMSG_TYPE_STRING)) {
1962                 uint8_t icsum, ocsum, iseqno, oseqno;
1963                 if (sscanf(blobmsg_get_string(cur), "%u,%u,%hhu,%hhu,%hhu,%hhu",
1964                         &ikey, &okey, &icsum, &ocsum, &iseqno, &oseqno) < 6) {
1965                         ret = -EINVAL;
1966                         goto failure;
1967                 }
1968
1969                 if (ikey)
1970                         iflags |= GRE_KEY;
1971
1972                 if (okey)
1973                         oflags |= GRE_KEY;
1974
1975                 if (icsum)
1976                         iflags |= GRE_CSUM;
1977
1978                 if (ocsum)
1979                         oflags |= GRE_CSUM;
1980
1981                 if (iseqno)
1982                         iflags |= GRE_SEQ;
1983
1984                 if (oseqno)
1985                         oflags |= GRE_SEQ;
1986         }
1987
1988         if (v6) {
1989                 struct in6_addr in6buf;
1990                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1991                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
1992                                 ret = -EINVAL;
1993                                 goto failure;
1994                         }
1995                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(in6buf), &in6buf);
1996                 }
1997
1998                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1999                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2000                                 ret = -EINVAL;
2001                                 goto failure;
2002                         }
2003                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(in6buf), &in6buf);
2004                 }
2005                 nla_put_u8(nlm, IFLA_GRE_ENCAP_LIMIT, 4);
2006
2007                 if (flowinfo)
2008                         nla_put_u32(nlm, IFLA_GRE_FLOWINFO, flowinfo);
2009
2010                 if (flags)
2011                         nla_put_u32(nlm, IFLA_GRE_FLAGS, flags);
2012         } else {
2013                 struct in_addr inbuf;
2014                 bool set_df = true;
2015
2016                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2017                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2018                                 ret = -EINVAL;
2019                                 goto failure;
2020                         }
2021                         nla_put(nlm, IFLA_GRE_LOCAL, sizeof(inbuf), &inbuf);
2022                 }
2023
2024                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2025                         if (inet_pton(AF_INET, blobmsg_data(cur), &inbuf) < 1) {
2026                                 ret = -EINVAL;
2027                                 goto failure;
2028                         }
2029                         nla_put(nlm, IFLA_GRE_REMOTE, sizeof(inbuf), &inbuf);
2030
2031                         if (IN_MULTICAST(ntohl(inbuf.s_addr))) {
2032                                 if (!okey) {
2033                                         okey = inbuf.s_addr;
2034                                         oflags |= GRE_KEY;
2035                                 }
2036
2037                                 if (!ikey) {
2038                                         ikey = inbuf.s_addr;
2039                                         iflags |= GRE_KEY;
2040                                 }
2041                         }
2042                 }
2043
2044                 if ((cur = tb[TUNNEL_ATTR_DF]))
2045                         set_df = blobmsg_get_bool(cur);
2046
2047                 /* ttl !=0 and nopmtudisc are incompatible */
2048                 if (ttl && !set_df) {
2049                         ret = -EINVAL;
2050                         goto failure;
2051                 }
2052
2053                 nla_put_u8(nlm, IFLA_GRE_PMTUDISC, set_df ? 1 : 0);
2054
2055                 nla_put_u8(nlm, IFLA_GRE_TOS, tos);
2056         }
2057
2058         if (oflags)
2059                 nla_put_u16(nlm, IFLA_GRE_OFLAGS, oflags);
2060
2061         if (iflags)
2062                 nla_put_u16(nlm, IFLA_GRE_IFLAGS, iflags);
2063
2064         if (okey)
2065                 nla_put_u32(nlm, IFLA_GRE_OKEY, okey);
2066
2067         if (ikey)
2068                 nla_put_u32(nlm, IFLA_GRE_IKEY, ikey);
2069
2070         nla_nest_end(nlm, infodata);
2071         nla_nest_end(nlm, linkinfo);
2072
2073         return system_rtnl_call(nlm);
2074
2075 failure:
2076         nlmsg_free(nlm);
2077         return ret;
2078 }
2079 #endif
2080
2081 static int system_add_proto_tunnel(const char *name, const uint8_t proto, const unsigned int link, struct blob_attr **tb)
2082 {
2083         struct blob_attr *cur;
2084         bool set_df = true;
2085         struct ip_tunnel_parm p  = {
2086                 .link = link,
2087                 .iph = {
2088                         .version = 4,
2089                         .ihl = 5,
2090                         .protocol = proto,
2091                 }
2092         };
2093
2094         if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
2095                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
2096                 return -EINVAL;
2097
2098         if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
2099                         inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
2100                 return -EINVAL;
2101
2102         if ((cur = tb[TUNNEL_ATTR_DF]))
2103                 set_df = blobmsg_get_bool(cur);
2104
2105         if ((cur = tb[TUNNEL_ATTR_TTL]))
2106                 p.iph.ttl = blobmsg_get_u32(cur);
2107
2108         if ((cur = tb[TUNNEL_ATTR_TOS])) {
2109                 char *str = blobmsg_get_string(cur);
2110                 if (strcmp(str, "inherit")) {
2111                         unsigned uval;
2112
2113                         if (!system_tos_aton(str, &uval))
2114                                 return -EINVAL;
2115
2116                         p.iph.tos = uval;
2117                 } else
2118                         p.iph.tos = 1;
2119         }
2120
2121         p.iph.frag_off = set_df ? htons(IP_DF) : 0;
2122         /* ttl !=0 and nopmtudisc are incompatible */
2123         if (p.iph.ttl && p.iph.frag_off == 0)
2124                 return -EINVAL;
2125
2126         strncpy(p.name, name, sizeof(p.name));
2127
2128         switch (p.iph.protocol) {
2129         case IPPROTO_IPIP:
2130                 return tunnel_ioctl("tunl0", SIOCADDTUNNEL, &p);
2131         case IPPROTO_IPV6:
2132                 return tunnel_ioctl("sit0", SIOCADDTUNNEL, &p);
2133         default:
2134                 break;
2135         }
2136         return -1;
2137 }
2138
2139 static int __system_del_ip_tunnel(const char *name, struct blob_attr **tb)
2140 {
2141         struct blob_attr *cur;
2142         const char *str;
2143
2144         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2145                 return -EINVAL;
2146         str = blobmsg_data(cur);
2147
2148         if (!strcmp(str, "greip") || !strcmp(str, "gretapip") ||
2149             !strcmp(str, "greip6") || !strcmp(str, "gretapip6"))
2150                 return system_link_del(name);
2151         else
2152                 return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
2153 }
2154
2155 int system_del_ip_tunnel(const char *name, struct blob_attr *attr)
2156 {
2157         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2158
2159         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2160                 blob_data(attr), blob_len(attr));
2161
2162         return __system_del_ip_tunnel(name, tb);
2163 }
2164
2165 int system_update_ipv6_mtu(struct device *dev, int mtu)
2166 {
2167         int ret = -1;
2168         char buf[64];
2169         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
2170                         dev->ifname);
2171
2172         int fd = open(buf, O_RDWR);
2173
2174         if (!mtu) {
2175                 ssize_t len = read(fd, buf, sizeof(buf) - 1);
2176                 if (len < 0)
2177                         goto out;
2178
2179                 buf[len] = 0;
2180                 ret = atoi(buf);
2181         } else {
2182                 if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) > 0)
2183                         ret = mtu;
2184         }
2185
2186 out:
2187         close(fd);
2188         return ret;
2189 }
2190
2191 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
2192 {
2193         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
2194         struct blob_attr *cur;
2195         const char *str;
2196
2197         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
2198                 blob_data(attr), blob_len(attr));
2199
2200         __system_del_ip_tunnel(name, tb);
2201
2202         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
2203                 return -EINVAL;
2204         str = blobmsg_data(cur);
2205
2206         unsigned int ttl = 0;
2207         if ((cur = tb[TUNNEL_ATTR_TTL])) {
2208                 ttl = blobmsg_get_u32(cur);
2209                 if (ttl > 255)
2210                         return -EINVAL;
2211         }
2212
2213         unsigned int link = 0;
2214         if ((cur = tb[TUNNEL_ATTR_LINK])) {
2215                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
2216                 if (!iface)
2217                         return -EINVAL;
2218
2219                 if (iface->l3_dev.dev)
2220                         link = iface->l3_dev.dev->ifindex;
2221         }
2222
2223         if (!strcmp(str, "sit")) {
2224                 if (system_add_proto_tunnel(name, IPPROTO_IPV6, link, tb) < 0)
2225                         return -1;
2226
2227 #ifdef SIOCADD6RD
2228                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
2229                         unsigned int mask;
2230                         struct ip_tunnel_6rd p6;
2231
2232                         memset(&p6, 0, sizeof(p6));
2233
2234                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
2235                                                 &p6.prefix, &mask) || mask > 128)
2236                                 return -EINVAL;
2237                         p6.prefixlen = mask;
2238
2239                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
2240                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
2241                                                         &p6.relay_prefix, &mask) || mask > 32)
2242                                         return -EINVAL;
2243                                 p6.relay_prefixlen = mask;
2244                         }
2245
2246                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
2247                                 __system_del_ip_tunnel(name, tb);
2248                                 return -1;
2249                         }
2250                 }
2251 #endif
2252 #ifdef IFLA_IPTUN_MAX
2253         } else if (!strcmp(str, "ipip6")) {
2254                 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
2255                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
2256                 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
2257                 int ret = 0;
2258
2259                 if (!nlm)
2260                         return -1;
2261
2262                 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
2263                 nla_put_string(nlm, IFLA_IFNAME, name);
2264
2265                 if (link)
2266                         nla_put_u32(nlm, IFLA_LINK, link);
2267
2268                 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
2269                 if (!linkinfo) {
2270                         ret = -ENOMEM;
2271                         goto failure;
2272                 }
2273                 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
2274                 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
2275                 if (!infodata) {
2276                         ret = -ENOMEM;
2277                         goto failure;
2278                 }
2279
2280                 if (link)
2281                         nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
2282
2283                 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
2284                 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
2285                 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
2286
2287                 struct in6_addr in6buf;
2288                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
2289                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2290                                 ret = -EINVAL;
2291                                 goto failure;
2292                         }
2293                         nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
2294                 }
2295
2296                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
2297                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1) {
2298                                 ret = -EINVAL;
2299                                 goto failure;
2300                         }
2301                         nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
2302                 }
2303
2304 #ifdef IFLA_IPTUN_FMR_MAX
2305                 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
2306                         struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
2307
2308                         struct blob_attr *fmr;
2309                         unsigned rem, fmrcnt = 0;
2310                         blobmsg_for_each_attr(fmr, cur, rem) {
2311                                 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
2312                                         continue;
2313
2314                                 unsigned ip4len, ip6len, ealen, offset = 6;
2315                                 char ip6buf[48];
2316                                 char ip4buf[16];
2317
2318                                 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
2319                                                 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5) {
2320                                         ret = -EINVAL;
2321                                         goto failure;
2322                                 }
2323
2324                                 struct in6_addr ip6prefix;
2325                                 struct in_addr ip4prefix;
2326                                 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
2327                                                 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1) {
2328                                         ret = -EINVAL;
2329                                         goto failure;
2330                                 }
2331
2332                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
2333
2334                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
2335                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
2336                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
2337                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
2338                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
2339                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
2340
2341                                 nla_nest_end(nlm, rule);
2342                         }
2343
2344                         nla_nest_end(nlm, fmrs);
2345                 }
2346 #endif
2347
2348                 nla_nest_end(nlm, infodata);
2349                 nla_nest_end(nlm, linkinfo);
2350
2351                 return system_rtnl_call(nlm);
2352 failure:
2353                 nlmsg_free(nlm);
2354                 return ret;
2355         } else if (!strcmp(str, "greip")) {
2356                 return system_add_gre_tunnel(name, "gre", link, tb, false);
2357         } else if (!strcmp(str, "gretapip"))  {
2358                 return system_add_gre_tunnel(name, "gretap", link, tb, false);
2359         } else if (!strcmp(str, "greip6")) {
2360                 return system_add_gre_tunnel(name, "ip6gre", link, tb, true);
2361         } else if (!strcmp(str, "gretapip6")) {
2362                 return system_add_gre_tunnel(name, "ip6gretap", link, tb, true);
2363 #endif
2364         } else if (!strcmp(str, "ipip")) {
2365                 return system_add_proto_tunnel(name, IPPROTO_IPIP, link, tb);
2366         }
2367         else
2368                 return -EINVAL;
2369
2370         return 0;
2371 }