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