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  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16 #define _GNU_SOURCE
  17
  18 #include <sys/socket.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/stat.h>
  21 #include <sys/syscall.h>
  22
  23 #include <net/if.h>
  24 #include <net/if_arp.h>
  25
  26 #include <arpa/inet.h>
  27 #include <netinet/in.h>
  28
  29 #include <linux/rtnetlink.h>
  30 #include <linux/sockios.h>
  31 #include <linux/ip.h>
  32 #include <linux/if_vlan.h>
  33 #include <linux/if_bridge.h>
  34 #include <linux/if_tunnel.h>
  35 #include <linux/ip6_tunnel.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/fib_rules.h>
  38
  39 #ifndef RTN_FAILED_POLICY
  40 #define RTN_FAILED_POLICY 12
  41 #endif
  42
  43 #include <unistd.h>
  44 #include <string.h>
  45 #include <fcntl.h>
  46 #include <glob.h>
  47 #include <time.h>
  48
  49 #include <netlink/msg.h>
  50 #include <netlink/attr.h>
  51 #include <netlink/socket.h>
  52 #include <libubox/uloop.h>
  53
  54 #include "netifd.h"
  55 #include "device.h"
  56 #include "system.h"
  57
  58 struct event_socket {
  59         struct uloop_fd uloop;
  60         struct nl_sock *sock;
  61         struct nl_cb *cb;
  62 };
  63
  64 static int sock_ioctl = -1;
  65 static struct nl_sock *sock_rtnl = NULL;
  66
  67 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  68 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  69
  70 static char dev_buf[256];
  71
  72 static void
  73 handler_nl_event(struct uloop_fd *u, unsigned int events)
  74 {
  75         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  76         nl_recvmsgs(ev->sock, ev->cb);
  77 }
  78
  79 static struct nl_sock *
  80 create_socket(int protocol, int groups)
  81 {
  82         struct nl_sock *sock;
  83
  84         sock = nl_socket_alloc();
  85         if (!sock)
  86                 return NULL;
  87
  88         if (groups)
  89                 nl_join_groups(sock, groups);
  90
  91         if (nl_connect(sock, protocol))
  92                 return NULL;
  93
  94         return sock;
  95 }
  96
  97 static bool
  98 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
  99                         uloop_fd_handler cb)
 100 {
 101         ev->sock = create_socket(protocol, groups);
 102         if (!ev->sock)
 103                 return false;
 104
 105         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 106         ev->uloop.cb = cb;
 107         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
 108         return true;
 109 }
 110
 111 static bool
 112 create_event_socket(struct event_socket *ev, int protocol,
 113                     int (*cb)(struct nl_msg *msg, void *arg))
 114 {
 115         // Prepare socket for link events
 116         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
 117         if (!ev->cb)
 118                 return false;
 119
 120         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 121
 122         return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
 123 }
 124
 125 int system_init(void)
 126 {
 127         static struct event_socket rtnl_event;
 128         static struct event_socket hotplug_event;
 129
 130         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 131         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
 132
 133         // Prepare socket for routing / address control
 134         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 135         if (!sock_rtnl)
 136                 return -1;
 137
 138         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 139                 return -1;
 140
 141         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 142                                      handle_hotplug_event))
 143                 return -1;
 144
 145         // Receive network link events form kernel
 146         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 147
 148         return 0;
 149 }
 150
 151 static void system_set_sysctl(const char *path, const char *val)
 152 {
 153         int fd;
 154
 155         fd = open(path, O_WRONLY);
 156         if (fd < 0)
 157                 return;
 158
 159         write(fd, val, strlen(val));
 160         close(fd);
 161 }
 162
 163 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 164 {
 165         snprintf(dev_buf, sizeof(dev_buf), path, device);
 166         system_set_sysctl(dev_buf, val);
 167 }
 168
 169 static void system_set_disable_ipv6(struct device *dev, const char *val)
 170 {
 171         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 172 }
 173
 174 // Evaluate netlink messages
 175 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 176 {
 177         struct nlmsghdr *nh = nlmsg_hdr(msg);
 178         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 179         struct nlattr *nla[__IFLA_MAX];
 180
 181         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 182                 goto out;
 183
 184         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 185         if (!nla[IFLA_IFNAME])
 186                 goto out;
 187
 188         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 189         if (!dev)
 190                 goto out;
 191
 192         dev->ifindex = ifi->ifi_index;
 193         /* TODO: parse link status */
 194
 195 out:
 196         return 0;
 197 }
 198
 199 static void
 200 handle_hotplug_msg(char *data, int size)
 201 {
 202         const char *subsystem = NULL, *interface = NULL;
 203         char *cur, *end, *sep;
 204         struct device *dev;
 205         int skip;
 206         bool add;
 207
 208         if (!strncmp(data, "add@", 4))
 209                 add = true;
 210         else if (!strncmp(data, "remove@", 7))
 211                 add = false;
 212         else
 213                 return;
 214
 215         skip = strlen(data) + 1;
 216         end = data + size;
 217
 218         for (cur = data + skip; cur < end; cur += skip) {
 219                 skip = strlen(cur) + 1;
 220
 221                 sep = strchr(cur, '=');
 222                 if (!sep)
 223                         continue;
 224
 225                 *sep = 0;
 226                 if (!strcmp(cur, "INTERFACE"))
 227                         interface = sep + 1;
 228                 else if (!strcmp(cur, "SUBSYSTEM")) {
 229                         subsystem = sep + 1;
 230                         if (strcmp(subsystem, "net") != 0)
 231                                 return;
 232                 }
 233                 if (subsystem && interface)
 234                         goto found;
 235         }
 236         return;
 237
 238 found:
 239         dev = device_get(interface, false);
 240         if (!dev)
 241                 return;
 242
 243         if (dev->type != &simple_device_type)
 244                 return;
 245
 246         if (add && system_if_force_external(dev->ifname))
 247                 return;
 248
 249         device_set_present(dev, add);
 250 }
 251
 252 static void
 253 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 254 {
 255         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 256         struct sockaddr_nl nla;
 257         unsigned char *buf = NULL;
 258         int size;
 259
 260         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 261                 if (nla.nl_pid == 0)
 262                         handle_hotplug_msg((char *) buf, size);
 263
 264                 free(buf);
 265         }
 266 }
 267
 268 static int system_rtnl_call(struct nl_msg *msg)
 269 {
 270         int ret;
 271
 272         ret = nl_send_auto_complete(sock_rtnl, msg);
 273         nlmsg_free(msg);
 274
 275         if (ret < 0)
 276                 return ret;
 277
 278         return nl_wait_for_ack(sock_rtnl);
 279 }
 280
 281 int system_bridge_delbr(struct device *bridge)
 282 {
 283         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 284 }
 285
 286 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 287 {
 288         struct ifreq ifr;
 289
 290         memset(&ifr, 0, sizeof(ifr));
 291         if (dev)
 292                 ifr.ifr_ifindex = dev->ifindex;
 293         else
 294                 ifr.ifr_data = data;
 295         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 296         return ioctl(sock_ioctl, cmd, &ifr);
 297 }
 298
 299 static bool system_is_bridge(const char *name, char *buf, int buflen)
 300 {
 301         struct stat st;
 302
 303         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 304         if (stat(buf, &st) < 0)
 305                 return false;
 306
 307         return true;
 308 }
 309
 310 static char *system_get_bridge(const char *name, char *buf, int buflen)
 311 {
 312         char *path;
 313         ssize_t len;
 314         glob_t gl;
 315
 316         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 317         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 318                 return NULL;
 319
 320         if (gl.gl_pathc == 0)
 321                 return NULL;
 322
 323         len = readlink(gl.gl_pathv[0], buf, buflen);
 324         if (len < 0)
 325                 return NULL;
 326
 327         buf[len] = 0;
 328         path = strrchr(buf, '/');
 329         if (!path)
 330                 return NULL;
 331
 332         return path + 1;
 333 }
 334
 335 int system_bridge_addif(struct device *bridge, struct device *dev)
 336 {
 337         char *oldbr;
 338
 339         system_set_disable_ipv6(dev, "1");
 340         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 341         if (oldbr && !strcmp(oldbr, bridge->ifname))
 342                 return 0;
 343
 344         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 345 }
 346
 347 int system_bridge_delif(struct device *bridge, struct device *dev)
 348 {
 349         system_set_disable_ipv6(dev, "0");
 350         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 351 }
 352
 353 static int system_if_resolve(struct device *dev)
 354 {
 355         struct ifreq ifr;
 356         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 357         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 358                 return ifr.ifr_ifindex;
 359         else
 360                 return 0;
 361 }
 362
 363 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 364 {
 365         struct ifreq ifr;
 366
 367         memset(&ifr, 0, sizeof(ifr));
 368         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 369         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 370         ifr.ifr_flags |= add;
 371         ifr.ifr_flags &= ~rem;
 372         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 373 }
 374
 375 struct clear_data {
 376         struct nl_msg *msg;
 377         struct device *dev;
 378         int type;
 379         int size;
 380         int af;
 381 };
 382
 383
 384 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 385 {
 386         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 387
 388         return ifa->ifa_index == ifindex;
 389 }
 390
 391 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 392 {
 393         struct rtmsg *r = NLMSG_DATA(hdr);
 394         struct nlattr *tb[__RTA_MAX];
 395
 396         if (r->rtm_protocol == RTPROT_KERNEL &&
 397             r->rtm_family == AF_INET6)
 398                 return false;
 399
 400         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 401         if (!tb[RTA_OIF])
 402                 return false;
 403
 404         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 405 }
 406
 407 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 408 {
 409         return true;
 410 }
 411
 412 static int cb_clear_event(struct nl_msg *msg, void *arg)
 413 {
 414         struct clear_data *clr = arg;
 415         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 416         bool (*cb)(struct nlmsghdr *, int ifindex);
 417         int type;
 418
 419         switch(clr->type) {
 420         case RTM_GETADDR:
 421                 type = RTM_DELADDR;
 422                 if (hdr->nlmsg_type != RTM_NEWADDR)
 423                         return NL_SKIP;
 424
 425                 cb = check_ifaddr;
 426                 break;
 427         case RTM_GETROUTE:
 428                 type = RTM_DELROUTE;
 429                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 430                         return NL_SKIP;
 431
 432                 cb = check_route;
 433                 break;
 434         case RTM_GETRULE:
 435                 type = RTM_DELRULE;
 436                 if (hdr->nlmsg_type != RTM_NEWRULE)
 437                         return NL_SKIP;
 438
 439                 cb = check_rule;
 440                 break;
 441         default:
 442                 return NL_SKIP;
 443         }
 444
 445         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 446                 return NL_SKIP;
 447
 448         if (type == RTM_DELRULE)
 449                 D(SYSTEM, "Remove a rule\n");
 450         else
 451                 D(SYSTEM, "Remove %s from device %s\n",
 452                   type == RTM_DELADDR ? "an address" : "a route",
 453                   clr->dev->ifname);
 454         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 455         hdr = nlmsg_hdr(clr->msg);
 456         hdr->nlmsg_type = type;
 457         hdr->nlmsg_flags = NLM_F_REQUEST;
 458
 459         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 460                 nl_wait_for_ack(sock_rtnl);
 461
 462         return NL_SKIP;
 463 }
 464
 465 static int
 466 cb_finish_event(struct nl_msg *msg, void *arg)
 467 {
 468         int *pending = arg;
 469         *pending = 0;
 470         return NL_STOP;
 471 }
 472
 473 static int
 474 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 475 {
 476         int *pending = arg;
 477         *pending = err->error;
 478         return NL_STOP;
 479 }
 480
 481 static void
 482 system_if_clear_entries(struct device *dev, int type, int af)
 483 {
 484         struct clear_data clr;
 485         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 486         struct rtmsg rtm = {
 487                 .rtm_family = af,
 488                 .rtm_flags = RTM_F_CLONED,
 489         };
 490         int flags = NLM_F_DUMP;
 491         int pending = 1;
 492
 493         clr.af = af;
 494         clr.dev = dev;
 495         clr.type = type;
 496         switch (type) {
 497         case RTM_GETADDR:
 498         case RTM_GETRULE:
 499                 clr.size = sizeof(struct rtgenmsg);
 500                 break;
 501         case RTM_GETROUTE:
 502                 clr.size = sizeof(struct rtmsg);
 503                 break;
 504         default:
 505                 return;
 506         }
 507
 508         if (!cb)
 509                 return;
 510
 511         clr.msg = nlmsg_alloc_simple(type, flags);
 512         if (!clr.msg)
 513                 goto out;
 514
 515         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 516         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 517         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 518         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 519
 520         nl_send_auto_complete(sock_rtnl, clr.msg);
 521         while (pending > 0)
 522                 nl_recvmsgs(sock_rtnl, cb);
 523
 524         nlmsg_free(clr.msg);
 525 out:
 526         nl_cb_put(cb);
 527 }
 528
 529 /*
 530  * Clear bridge (membership) state and bring down device
 531  */
 532 void system_if_clear_state(struct device *dev)
 533 {
 534         static char buf[256];
 535         char *bridge;
 536
 537         if (dev->external)
 538                 return;
 539
 540         dev->ifindex = system_if_resolve(dev);
 541         if (!dev->ifindex)
 542                 return;
 543
 544         system_if_flags(dev->ifname, 0, IFF_UP);
 545
 546         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 547                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 548                 system_bridge_delbr(dev);
 549                 return;
 550         }
 551
 552         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 553         if (bridge) {
 554                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 555                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 556         }
 557
 558         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 559         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 560         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 561         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 562         system_set_disable_ipv6(dev, "0");
 563 }
 564
 565 static inline unsigned long
 566 sec_to_jiffies(int val)
 567 {
 568         return (unsigned long) val * 100;
 569 }
 570
 571 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 572 {
 573         unsigned long args[4] = {};
 574
 575         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 576                 return -1;
 577
 578         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 579         args[1] = !!cfg->stp;
 580         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 581
 582         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 583         args[1] = sec_to_jiffies(cfg->forward_delay);
 584         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 585
 586         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 587                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 588
 589         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 590         args[1] = cfg->priority;
 591         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 592
 593         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 594                 args[0] = BRCTL_SET_AGEING_TIME;
 595                 args[1] = sec_to_jiffies(cfg->ageing_time);
 596                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 597         }
 598
 599         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 600                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 601                 args[1] = sec_to_jiffies(cfg->hello_time);
 602                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 603         }
 604
 605         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 606                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 607                 args[1] = sec_to_jiffies(cfg->max_age);
 608                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 609         }
 610
 611         return 0;
 612 }
 613
 614 static int system_vlan(struct device *dev, int id)
 615 {
 616         struct vlan_ioctl_args ifr = {
 617                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 618                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 619         };
 620
 621         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 622
 623         if (id < 0) {
 624                 ifr.cmd = DEL_VLAN_CMD;
 625                 ifr.u.VID = 0;
 626         } else {
 627                 ifr.cmd = ADD_VLAN_CMD;
 628                 ifr.u.VID = id;
 629         }
 630         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 631         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 632 }
 633
 634 int system_vlan_add(struct device *dev, int id)
 635 {
 636         return system_vlan(dev, id);
 637 }
 638
 639 int system_vlan_del(struct device *dev)
 640 {
 641         return system_vlan(dev, -1);
 642 }
 643
 644 static void
 645 system_if_get_settings(struct device *dev, struct device_settings *s)
 646 {
 647         struct ifreq ifr;
 648
 649         memset(&ifr, 0, sizeof(ifr));
 650         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 651
 652         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 653                 s->mtu = ifr.ifr_mtu;
 654                 s->flags |= DEV_OPT_MTU;
 655         }
 656
 657         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 658                 s->txqueuelen = ifr.ifr_qlen;
 659                 s->flags |= DEV_OPT_TXQUEUELEN;
 660         }
 661
 662         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 663                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 664                 s->flags |= DEV_OPT_MACADDR;
 665         }
 666 }
 667
 668 void
 669 system_if_apply_settings(struct device *dev, struct device_settings *s)
 670 {
 671         struct ifreq ifr;
 672
 673         memset(&ifr, 0, sizeof(ifr));
 674         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 675         if (s->flags & DEV_OPT_MTU) {
 676                 ifr.ifr_mtu = s->mtu;
 677                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 678                         s->flags &= ~DEV_OPT_MTU;
 679         }
 680         if (s->flags & DEV_OPT_TXQUEUELEN) {
 681                 ifr.ifr_qlen = s->txqueuelen;
 682                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 683                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 684         }
 685         if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
 686                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 687                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 688                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 689                         s->flags &= ~DEV_OPT_MACADDR;
 690         }
 691 }
 692
 693 int system_if_up(struct device *dev)
 694 {
 695         system_if_get_settings(dev, &dev->orig_settings);
 696         system_if_apply_settings(dev, &dev->settings);
 697         dev->ifindex = system_if_resolve(dev);
 698         return system_if_flags(dev->ifname, IFF_UP, 0);
 699 }
 700
 701 int system_if_down(struct device *dev)
 702 {
 703         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 704         dev->orig_settings.flags &= dev->settings.flags;
 705         system_if_apply_settings(dev, &dev->orig_settings);
 706         return ret;
 707 }
 708
 709 int system_if_check(struct device *dev)
 710 {
 711         device_set_present(dev, (system_if_resolve(dev) > 0));
 712         return 0;
 713 }
 714
 715 struct device *
 716 system_if_get_parent(struct device *dev)
 717 {
 718         char buf[64], *devname;
 719         int ifindex, iflink, len;
 720         FILE *f;
 721
 722         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 723         f = fopen(buf, "r");
 724         if (!f)
 725                 return NULL;
 726
 727         len = fread(buf, 1, sizeof(buf) - 1, f);
 728         fclose(f);
 729
 730         if (len <= 0)
 731                 return NULL;
 732
 733         buf[len] = 0;
 734         iflink = strtoul(buf, NULL, 0);
 735         ifindex = system_if_resolve(dev);
 736         if (!iflink || iflink == ifindex)
 737                 return NULL;
 738
 739         devname = if_indextoname(iflink, buf);
 740         if (!devname)
 741                 return NULL;
 742
 743         return device_get(devname, true);
 744 }
 745
 746 static bool
 747 read_string_file(int dir_fd, const char *file, char *buf, int len)
 748 {
 749         bool ret = false;
 750         char *c;
 751         int fd;
 752
 753         fd = openat(dir_fd, file, O_RDONLY);
 754         if (fd < 0)
 755                 return false;
 756
 757 retry:
 758         len = read(fd, buf, len - 1);
 759         if (len < 0) {
 760                 if (errno == EINTR)
 761                         goto retry;
 762         } else if (len > 0) {
 763                         buf[len] = 0;
 764
 765                         c = strchr(buf, '\n');
 766                         if (c)
 767                                 *c = 0;
 768
 769                         ret = true;
 770         }
 771
 772         close(fd);
 773
 774         return ret;
 775 }
 776
 777 static bool
 778 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
 779 {
 780         char buf[64];
 781         bool ret = false;
 782
 783         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 784         if (ret)
 785                 *val = strtoull(buf, NULL, 0);
 786
 787         return ret;
 788 }
 789
 790 /* Assume advertised flags == supported flags */
 791 static const struct {
 792         uint32_t mask;
 793         const char *name;
 794 } ethtool_link_modes[] = {
 795         { ADVERTISED_10baseT_Half, "10H" },
 796         { ADVERTISED_10baseT_Full, "10F" },
 797         { ADVERTISED_100baseT_Half, "100H" },
 798         { ADVERTISED_100baseT_Full, "100F" },
 799         { ADVERTISED_1000baseT_Half, "1000H" },
 800         { ADVERTISED_1000baseT_Full, "1000F" },
 801 };
 802
 803 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 804 {
 805         int i;
 806         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 807                 if (mask & ethtool_link_modes[i].mask)
 808                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 809         }
 810 }
 811
 812 bool
 813 system_if_force_external(const char *ifname)
 814 {
 815         char buf[64];
 816         struct stat s;
 817
 818         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 819         return stat(buf, &s) == 0;
 820 }
 821
 822 int
 823 system_if_dump_info(struct device *dev, struct blob_buf *b)
 824 {
 825         struct ethtool_cmd ecmd;
 826         struct ifreq ifr;
 827         char buf[64], *s;
 828         void *c;
 829         int dir_fd;
 830         uint64_t val = 0;
 831
 832         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 833         dir_fd = open(buf, O_DIRECTORY);
 834
 835         if (read_uint64_file(dir_fd, "carrier", &val))
 836                 blobmsg_add_u8(b, "link", !!val);
 837
 838         memset(&ecmd, 0, sizeof(ecmd));
 839         memset(&ifr, 0, sizeof(ifr));
 840         strcpy(ifr.ifr_name, dev->ifname);
 841         ifr.ifr_data = (caddr_t) &ecmd;
 842         ecmd.cmd = ETHTOOL_GSET;
 843
 844         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 845                 c = blobmsg_open_array(b, "link-advertising");
 846                 system_add_link_modes(b, ecmd.advertising);
 847                 blobmsg_close_array(b, c);
 848
 849                 c = blobmsg_open_array(b, "link-supported");
 850                 system_add_link_modes(b, ecmd.supported);
 851                 blobmsg_close_array(b, c);
 852
 853                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 854                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 855                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 856                 blobmsg_add_string_buffer(b);
 857         }
 858
 859         close(dir_fd);
 860         return 0;
 861 }
 862
 863 int
 864 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 865 {
 866         const char *const counters[] = {
 867                 "collisions",     "rx_frame_errors",   "tx_compressed",
 868                 "multicast",      "rx_length_errors",  "tx_dropped",
 869                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 870                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 871                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 872                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 873                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 874                 "rx_fifo_errors", "tx_carrier_errors",
 875         };
 876         char buf[64];
 877         int stats_dir;
 878         int i;
 879         uint64_t val = 0;
 880
 881         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 882         stats_dir = open(buf, O_DIRECTORY);
 883         if (stats_dir < 0)
 884                 return -1;
 885
 886         for (i = 0; i < ARRAY_SIZE(counters); i++)
 887                 if (read_uint64_file(stats_dir, counters[i], &val))
 888                         blobmsg_add_u64(b, counters[i], val);
 889
 890         close(stats_dir);
 891         return 0;
 892 }
 893
 894 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 895 {
 896         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 897         int alen = v4 ? 4 : 16;
 898         unsigned int flags = 0;
 899         struct ifaddrmsg ifa = {
 900                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 901                 .ifa_prefixlen = addr->mask,
 902                 .ifa_index = dev->ifindex,
 903         };
 904
 905         struct nl_msg *msg;
 906         if (cmd == RTM_NEWADDR)
 907                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 908
 909         msg = nlmsg_alloc_simple(cmd, flags);
 910         if (!msg)
 911                 return -1;
 912
 913         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 914         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 915         if (v4) {
 916                 if (addr->broadcast)
 917                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 918                 if (addr->point_to_point)
 919                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 920         } else {
 921                 time_t now = system_get_rtime();
 922                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
 923
 924                 if (addr->preferred_until) {
 925                         int64_t preferred = addr->preferred_until - now;
 926                         if (preferred < 0)
 927                                 preferred = 0;
 928                         else if (preferred > UINT32_MAX)
 929                                 preferred = UINT32_MAX;
 930
 931                         cinfo.ifa_prefered = preferred;
 932                 }
 933
 934                 if (addr->valid_until) {
 935                         int64_t valid = addr->valid_until - now;
 936                         if (valid <= 0)
 937                                 return -1;
 938                         else if (valid > UINT32_MAX)
 939                                 valid = UINT32_MAX;
 940
 941                         cinfo.ifa_valid = valid;
 942                 }
 943
 944                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
 945         }
 946
 947         return system_rtnl_call(msg);
 948 }
 949
 950 int system_add_address(struct device *dev, struct device_addr *addr)
 951 {
 952         return system_addr(dev, addr, RTM_NEWADDR);
 953 }
 954
 955 int system_del_address(struct device *dev, struct device_addr *addr)
 956 {
 957         return system_addr(dev, addr, RTM_DELADDR);
 958 }
 959
 960 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 961 {
 962         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 963         bool have_gw;
 964         unsigned int flags = 0;
 965
 966         if (alen == 4)
 967                 have_gw = !!route->nexthop.in.s_addr;
 968         else
 969                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 970                         route->nexthop.in6.s6_addr32[1] ||
 971                         route->nexthop.in6.s6_addr32[2] ||
 972                         route->nexthop.in6.s6_addr32[3];
 973
 974         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 975                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 976
 977         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
 978                         ? route->table : RT_TABLE_MAIN;
 979
 980         struct rtmsg rtm = {
 981                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 982                 .rtm_dst_len = route->mask,
 983                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
 984                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
 985                 .rtm_scope = scope,
 986                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 987         };
 988         struct nl_msg *msg;
 989
 990         if (cmd == RTM_NEWROUTE) {
 991                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 992
 993                 if (!dev) { // Add null-route
 994                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
 995                         rtm.rtm_type = RTN_UNREACHABLE;
 996                 }
 997         }
 998
 999         msg = nlmsg_alloc_simple(cmd, flags);
1000         if (!msg)
1001                 return -1;
1002
1003         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1004
1005         if (route->mask)
1006                 nla_put(msg, RTA_DST, alen, &route->addr);
1007
1008         if (route->metric > 0)
1009                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1010
1011         if (have_gw)
1012                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1013
1014         if (dev)
1015                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1016
1017         if (table >= 256)
1018                 nla_put_u32(msg, RTA_TABLE, table);
1019
1020         return system_rtnl_call(msg);
1021 }
1022
1023 int system_add_route(struct device *dev, struct device_route *route)
1024 {
1025         return system_rt(dev, route, RTM_NEWROUTE);
1026 }
1027
1028 int system_del_route(struct device *dev, struct device_route *route)
1029 {
1030         return system_rt(dev, route, RTM_DELROUTE);
1031 }
1032
1033 int system_flush_routes(void)
1034 {
1035         const char *names[] = {
1036                 "/proc/sys/net/ipv4/route/flush",
1037                 "/proc/sys/net/ipv6/route/flush"
1038         };
1039         int fd, i;
1040
1041         for (i = 0; i < ARRAY_SIZE(names); i++) {
1042                 fd = open(names[i], O_WRONLY);
1043                 if (fd < 0)
1044                         continue;
1045
1046                 write(fd, "-1", 2);
1047                 close(fd);
1048         }
1049         return 0;
1050 }
1051
1052 bool system_resolve_rt_table(const char *name, unsigned int *id)
1053 {
1054         FILE *f;
1055         char *e, buf[128];
1056         unsigned int n, table = RT_TABLE_UNSPEC;
1057
1058         /* first try to parse table as number */
1059         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1060                 table = n;
1061
1062         /* handle well known aliases */
1063         else if (!strcmp(name, "default"))
1064                 table = RT_TABLE_DEFAULT;
1065         else if (!strcmp(name, "main"))
1066                 table = RT_TABLE_MAIN;
1067         else if (!strcmp(name, "local"))
1068                 table = RT_TABLE_LOCAL;
1069
1070         /* try to look up name in /etc/iproute2/rt_tables */
1071         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1072         {
1073                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1074                 {
1075                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1076                                 continue;
1077
1078                         n = strtoul(e, NULL, 10);
1079                         e = strtok(NULL, " \t\n");
1080
1081                         if (e && !strcmp(e, name))
1082                         {
1083                                 table = n;
1084                                 break;
1085                         }
1086                 }
1087
1088                 fclose(f);
1089         }
1090
1091         if (table == RT_TABLE_UNSPEC)
1092                 return false;
1093
1094         /* do not consider main table special */
1095         if (table == RT_TABLE_MAIN)
1096                 table = RT_TABLE_UNSPEC;
1097
1098         *id = table;
1099         return true;
1100 }
1101
1102 static int system_iprule(struct iprule *rule, int cmd)
1103 {
1104         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1105
1106         struct nl_msg *msg;
1107         struct rtmsg rtm = {
1108                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1109                 .rtm_protocol = RTPROT_STATIC,
1110                 .rtm_scope = RT_SCOPE_UNIVERSE,
1111                 .rtm_table = RT_TABLE_UNSPEC,
1112                 .rtm_type = RTN_UNSPEC,
1113                 .rtm_flags = 0,
1114         };
1115
1116         if (cmd == RTM_NEWRULE) {
1117                 rtm.rtm_type = RTN_UNICAST;
1118                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1119         }
1120
1121         if (rule->invert)
1122                 rtm.rtm_flags |= FIB_RULE_INVERT;
1123
1124         if (rule->flags & IPRULE_SRC)
1125                 rtm.rtm_src_len = rule->src_mask;
1126
1127         if (rule->flags & IPRULE_DEST)
1128                 rtm.rtm_dst_len = rule->dest_mask;
1129
1130         if (rule->flags & IPRULE_TOS)
1131                 rtm.rtm_tos = rule->tos;
1132
1133         if (rule->flags & IPRULE_LOOKUP) {
1134                 if (rule->lookup < 256)
1135                         rtm.rtm_table = rule->lookup;
1136         }
1137
1138         if (rule->flags & IPRULE_ACTION)
1139                 rtm.rtm_type = rule->action;
1140         else if (rule->flags & IPRULE_GOTO)
1141                 rtm.rtm_type = FR_ACT_GOTO;
1142         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1143                 rtm.rtm_type = FR_ACT_NOP;
1144
1145         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1146
1147         if (!msg)
1148                 return -1;
1149
1150         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1151
1152         if (rule->flags & IPRULE_IN)
1153                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1154
1155         if (rule->flags & IPRULE_OUT)
1156                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1157
1158         if (rule->flags & IPRULE_SRC)
1159                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1160
1161         if (rule->flags & IPRULE_DEST)
1162                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1163
1164         if (rule->flags & IPRULE_PRIORITY)
1165                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1166         else if (cmd == RTM_NEWRULE)
1167                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1168
1169         if (rule->flags & IPRULE_FWMARK)
1170                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1171
1172         if (rule->flags & IPRULE_FWMASK)
1173                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1174
1175         if (rule->flags & IPRULE_LOOKUP) {
1176                 if (rule->lookup >= 256)
1177                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1178         }
1179
1180         if (rule->flags & IPRULE_GOTO)
1181                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1182
1183         return system_rtnl_call(msg);
1184 }
1185
1186 int system_add_iprule(struct iprule *rule)
1187 {
1188         return system_iprule(rule, RTM_NEWRULE);
1189 }
1190
1191 int system_del_iprule(struct iprule *rule)
1192 {
1193         return system_iprule(rule, RTM_DELRULE);
1194 }
1195
1196 int system_flush_iprules(void)
1197 {
1198         int rv = 0;
1199         struct iprule rule;
1200
1201         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1202         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1203
1204         memset(&rule, 0, sizeof(rule));
1205
1206
1207         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1208
1209         rule.priority = 0;
1210         rule.lookup = RT_TABLE_LOCAL;
1211         rv |= system_iprule(&rule, RTM_NEWRULE);
1212
1213         rule.priority = 32766;
1214         rule.lookup = RT_TABLE_MAIN;
1215         rv |= system_iprule(&rule, RTM_NEWRULE);
1216
1217         rule.priority = 32767;
1218         rule.lookup = RT_TABLE_DEFAULT;
1219         rv |= system_iprule(&rule, RTM_NEWRULE);
1220
1221
1222         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1223
1224         rule.priority = 0;
1225         rule.lookup = RT_TABLE_LOCAL;
1226         rv |= system_iprule(&rule, RTM_NEWRULE);
1227
1228         rule.priority = 32766;
1229         rule.lookup = RT_TABLE_MAIN;
1230         rv |= system_iprule(&rule, RTM_NEWRULE);
1231
1232         return rv;
1233 }
1234
1235 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1236 {
1237         char *e;
1238         unsigned int n;
1239
1240         if (!strcmp(action, "local"))
1241                 n = RTN_LOCAL;
1242         else if (!strcmp(action, "nat"))
1243                 n = RTN_NAT;
1244         else if (!strcmp(action, "broadcast"))
1245                 n = RTN_BROADCAST;
1246         else if (!strcmp(action, "anycast"))
1247                 n = RTN_ANYCAST;
1248         else if (!strcmp(action, "multicast"))
1249                 n = RTN_MULTICAST;
1250         else if (!strcmp(action, "prohibit"))
1251                 n = RTN_PROHIBIT;
1252         else if (!strcmp(action, "unreachable"))
1253                 n = RTN_UNREACHABLE;
1254         else if (!strcmp(action, "blackhole"))
1255                 n = RTN_BLACKHOLE;
1256         else if (!strcmp(action, "xresolve"))
1257                 n = RTN_XRESOLVE;
1258         else if (!strcmp(action, "unicast"))
1259                 n = RTN_UNICAST;
1260         else if (!strcmp(action, "throw"))
1261                 n = RTN_THROW;
1262         else if (!strcmp(action, "failed_policy"))
1263                 n = RTN_FAILED_POLICY;
1264         else {
1265                 n = strtoul(action, &e, 0);
1266                 if (!e || *e || e == action || n > 255)
1267                         return false;
1268         }
1269
1270         *id = n;
1271         return true;
1272 }
1273
1274 time_t system_get_rtime(void)
1275 {
1276         struct timespec ts;
1277         struct timeval tv;
1278
1279         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1280                 return ts.tv_sec;
1281
1282         if (gettimeofday(&tv, NULL) == 0)
1283                 return tv.tv_sec;
1284
1285         return 0;
1286 }
1287
1288 #ifndef IP_DF
1289 #define IP_DF       0x4000
1290 #endif
1291
1292 static int tunnel_ioctl(const char *name, int cmd, void *p)
1293 {
1294         struct ifreq ifr;
1295
1296         memset(&ifr, 0, sizeof(ifr));
1297         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1298         ifr.ifr_ifru.ifru_data = p;
1299         return ioctl(sock_ioctl, cmd, &ifr);
1300 }
1301
1302 int system_del_ip_tunnel(const char *name)
1303 {
1304         return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1305 }
1306
1307 int system_update_ipv6_mtu(struct device *dev, int mtu)
1308 {
1309         int ret = -1;
1310         char buf[64];
1311         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1312                         dev->ifname);
1313
1314         int fd = open(buf, O_RDWR);
1315         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1316         if (len < 0)
1317                 goto out;
1318
1319         buf[len] = 0;
1320         ret = atoi(buf);
1321
1322         if (!mtu || ret <= mtu)
1323                 goto out;
1324
1325         lseek(fd, 0, SEEK_SET);
1326         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1327                 ret = -1;
1328
1329 out:
1330         close(fd);
1331         return ret;
1332 }
1333
1334
1335 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1336 {
1337         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1338         struct blob_attr *cur;
1339         const char *str;
1340
1341         system_del_ip_tunnel(name);
1342
1343         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1344                 blob_data(attr), blob_len(attr));
1345
1346         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1347                 return -EINVAL;
1348         str = blobmsg_data(cur);
1349
1350         unsigned int ttl = 0;
1351         if ((cur = tb[TUNNEL_ATTR_TTL]) && (ttl = blobmsg_get_u32(cur)) > 255)
1352                 return -EINVAL;
1353
1354         unsigned int link = 0;
1355         if ((cur = tb[TUNNEL_ATTR_LINK])) {
1356                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
1357                 if (!iface)
1358                         return -EINVAL;
1359
1360                 if (iface->l3_dev.dev)
1361                         link = iface->l3_dev.dev->ifindex;
1362         }
1363
1364
1365         if (!strcmp(str, "sit")) {
1366                 struct ip_tunnel_parm p = {
1367                         .link = link,
1368                         .iph = {
1369                                 .version = 4,
1370                                 .ihl = 5,
1371                                 .frag_off = htons(IP_DF),
1372                                 .protocol = IPPROTO_IPV6,
1373                                 .ttl = ttl
1374                         }
1375                 };
1376
1377                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1378                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1379                         return -EINVAL;
1380
1381                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1382                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1383                         return -EINVAL;
1384
1385                 strncpy(p.name, name, sizeof(p.name));
1386                 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1387                         return -1;
1388
1389 #ifdef SIOCADD6RD
1390                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1391                         unsigned int mask;
1392                         struct ip_tunnel_6rd p6;
1393
1394                         memset(&p6, 0, sizeof(p6));
1395
1396                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1397                                                 &p6.prefix, &mask) || mask > 128)
1398                                 return -EINVAL;
1399                         p6.prefixlen = mask;
1400
1401                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1402                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1403                                                         &p6.relay_prefix, &mask) || mask > 32)
1404                                         return -EINVAL;
1405                                 p6.relay_prefixlen = mask;
1406                         }
1407
1408                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1409                                 system_del_ip_tunnel(name);
1410                                 return -1;
1411                         }
1412                 }
1413 #endif
1414         } else if (!strcmp(str, "ipip6")) {
1415                 struct ip6_tnl_parm p = {
1416                         .link = link,
1417                         .proto = IPPROTO_IPIP,
1418                         .hop_limit = (ttl) ? ttl : 64,
1419                         .encap_limit = 4,
1420                 };
1421
1422                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1423                                 inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1)
1424                         return -EINVAL;
1425
1426                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1427                                 inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1)
1428                         return -EINVAL;
1429
1430                 strncpy(p.name, name, sizeof(p.name));
1431                 if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0)
1432                         return -1;
1433         } else
1434                 return -EINVAL;
1435
1436         return 0;
1437 }