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  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15 #define _GNU_SOURCE
  16
  17 #include <sys/socket.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/stat.h>
  20 #include <sys/syscall.h>
  21
  22 #include <net/if.h>
  23 #include <net/if_arp.h>
  24
  25 #include <arpa/inet.h>
  26 #include <netinet/in.h>
  27
  28 #include <linux/rtnetlink.h>
  29 #include <linux/sockios.h>
  30 #include <linux/ip.h>
  31 #include <linux/if_vlan.h>
  32 #include <linux/if_bridge.h>
  33 #include <linux/if_tunnel.h>
  34 #include <linux/ethtool.h>
  35 #include <linux/fib_rules.h>
  36
  37 #include <unistd.h>
  38 #include <string.h>
  39 #include <fcntl.h>
  40 #include <glob.h>
  41 #include <time.h>
  42
  43 #include <netlink/msg.h>
  44 #include <netlink/attr.h>
  45 #include <netlink/socket.h>
  46 #include <libubox/uloop.h>
  47
  48 #include "netifd.h"
  49 #include "device.h"
  50 #include "system.h"
  51
  52 struct event_socket {
  53         struct uloop_fd uloop;
  54         struct nl_sock *sock;
  55         struct nl_cb *cb;
  56 };
  57
  58 static int sock_ioctl = -1;
  59 static struct nl_sock *sock_rtnl = NULL;
  60
  61 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  62 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  63
  64 static char dev_buf[256];
  65
  66 static void
  67 handler_nl_event(struct uloop_fd *u, unsigned int events)
  68 {
  69         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  70         nl_recvmsgs(ev->sock, ev->cb);
  71 }
  72
  73 static struct nl_sock *
  74 create_socket(int protocol, int groups)
  75 {
  76         struct nl_sock *sock;
  77
  78         sock = nl_socket_alloc();
  79         if (!sock)
  80                 return NULL;
  81
  82         if (groups)
  83                 nl_join_groups(sock, groups);
  84
  85         if (nl_connect(sock, protocol))
  86                 return NULL;
  87
  88         return sock;
  89 }
  90
  91 static bool
  92 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
  93                         uloop_fd_handler cb)
  94 {
  95         ev->sock = create_socket(protocol, groups);
  96         if (!ev->sock)
  97                 return false;
  98
  99         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 100         ev->uloop.cb = cb;
 101         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
 102         return true;
 103 }
 104
 105 static bool
 106 create_event_socket(struct event_socket *ev, int protocol,
 107                     int (*cb)(struct nl_msg *msg, void *arg))
 108 {
 109         // Prepare socket for link events
 110         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
 111         if (!ev->cb)
 112                 return false;
 113
 114         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 115
 116         return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
 117 }
 118
 119 int system_init(void)
 120 {
 121         static struct event_socket rtnl_event;
 122         static struct event_socket hotplug_event;
 123
 124         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 125         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
 126
 127         // Prepare socket for routing / address control
 128         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 129         if (!sock_rtnl)
 130                 return -1;
 131
 132         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 133                 return -1;
 134
 135         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 136                                      handle_hotplug_event))
 137                 return -1;
 138
 139         // Receive network link events form kernel
 140         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 141
 142         return 0;
 143 }
 144
 145 static void system_set_sysctl(const char *path, const char *val)
 146 {
 147         int fd;
 148
 149         fd = open(path, O_WRONLY);
 150         if (fd < 0)
 151                 return;
 152
 153         write(fd, val, strlen(val));
 154         close(fd);
 155 }
 156
 157 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 158 {
 159         snprintf(dev_buf, sizeof(dev_buf), path, device);
 160         system_set_sysctl(dev_buf, val);
 161 }
 162
 163 static void system_set_disable_ipv6(struct device *dev, const char *val)
 164 {
 165         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 166 }
 167
 168 // Evaluate netlink messages
 169 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 170 {
 171         struct nlmsghdr *nh = nlmsg_hdr(msg);
 172         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 173         struct nlattr *nla[__IFLA_MAX];
 174
 175         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 176                 goto out;
 177
 178         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 179         if (!nla[IFLA_IFNAME])
 180                 goto out;
 181
 182         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 183         if (!dev)
 184                 goto out;
 185
 186         dev->ifindex = ifi->ifi_index;
 187         /* TODO: parse link status */
 188
 189 out:
 190         return 0;
 191 }
 192
 193 static void
 194 handle_hotplug_msg(char *data, int size)
 195 {
 196         const char *subsystem = NULL, *interface = NULL;
 197         char *cur, *end, *sep;
 198         struct device *dev;
 199         int skip;
 200         bool add;
 201
 202         if (!strncmp(data, "add@", 4))
 203                 add = true;
 204         else if (!strncmp(data, "remove@", 7))
 205                 add = false;
 206         else
 207                 return;
 208
 209         skip = strlen(data) + 1;
 210         end = data + size;
 211
 212         for (cur = data + skip; cur < end; cur += skip) {
 213                 skip = strlen(cur) + 1;
 214
 215                 sep = strchr(cur, '=');
 216                 if (!sep)
 217                         continue;
 218
 219                 *sep = 0;
 220                 if (!strcmp(cur, "INTERFACE"))
 221                         interface = sep + 1;
 222                 else if (!strcmp(cur, "SUBSYSTEM")) {
 223                         subsystem = sep + 1;
 224                         if (strcmp(subsystem, "net") != 0)
 225                                 return;
 226                 }
 227                 if (subsystem && interface)
 228                         goto found;
 229         }
 230         return;
 231
 232 found:
 233         dev = device_get(interface, false);
 234         if (!dev)
 235                 return;
 236
 237         if (dev->type != &simple_device_type)
 238                 return;
 239
 240         if (add && system_if_force_external(dev->ifname))
 241                 return;
 242
 243         device_set_present(dev, add);
 244 }
 245
 246 static void
 247 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 248 {
 249         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 250         struct sockaddr_nl nla;
 251         unsigned char *buf = NULL;
 252         int size;
 253
 254         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 255                 if (nla.nl_pid == 0)
 256                         handle_hotplug_msg((char *) buf, size);
 257
 258                 free(buf);
 259         }
 260 }
 261
 262 static int system_rtnl_call(struct nl_msg *msg)
 263 {
 264         int ret;
 265
 266         ret = nl_send_auto_complete(sock_rtnl, msg);
 267         nlmsg_free(msg);
 268
 269         if (ret < 0)
 270                 return ret;
 271
 272         return nl_wait_for_ack(sock_rtnl);
 273 }
 274
 275 int system_bridge_delbr(struct device *bridge)
 276 {
 277         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 278 }
 279
 280 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 281 {
 282         struct ifreq ifr;
 283
 284         memset(&ifr, 0, sizeof(ifr));
 285         if (dev)
 286                 ifr.ifr_ifindex = dev->ifindex;
 287         else
 288                 ifr.ifr_data = data;
 289         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 290         return ioctl(sock_ioctl, cmd, &ifr);
 291 }
 292
 293 static bool system_is_bridge(const char *name, char *buf, int buflen)
 294 {
 295         struct stat st;
 296
 297         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 298         if (stat(buf, &st) < 0)
 299                 return false;
 300
 301         return true;
 302 }
 303
 304 static char *system_get_bridge(const char *name, char *buf, int buflen)
 305 {
 306         char *path;
 307         ssize_t len;
 308         glob_t gl;
 309
 310         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 311         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 312                 return NULL;
 313
 314         if (gl.gl_pathc == 0)
 315                 return NULL;
 316
 317         len = readlink(gl.gl_pathv[0], buf, buflen);
 318         if (len < 0)
 319                 return NULL;
 320
 321         buf[len] = 0;
 322         path = strrchr(buf, '/');
 323         if (!path)
 324                 return NULL;
 325
 326         return path + 1;
 327 }
 328
 329 int system_bridge_addif(struct device *bridge, struct device *dev)
 330 {
 331         char *oldbr;
 332
 333         system_set_disable_ipv6(dev, "1");
 334         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 335         if (oldbr && !strcmp(oldbr, bridge->ifname))
 336                 return 0;
 337
 338         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 339 }
 340
 341 int system_bridge_delif(struct device *bridge, struct device *dev)
 342 {
 343         system_set_disable_ipv6(dev, "0");
 344         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 345 }
 346
 347 static int system_if_resolve(struct device *dev)
 348 {
 349         struct ifreq ifr;
 350         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 351         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 352                 return ifr.ifr_ifindex;
 353         else
 354                 return 0;
 355 }
 356
 357 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 358 {
 359         struct ifreq ifr;
 360
 361         memset(&ifr, 0, sizeof(ifr));
 362         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 363         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 364         ifr.ifr_flags |= add;
 365         ifr.ifr_flags &= ~rem;
 366         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 367 }
 368
 369 struct clear_data {
 370         struct nl_msg *msg;
 371         struct device *dev;
 372         int type;
 373         int size;
 374         int af;
 375 };
 376
 377
 378 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 379 {
 380         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 381
 382         return ifa->ifa_index == ifindex;
 383 }
 384
 385 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 386 {
 387         struct rtmsg *r = NLMSG_DATA(hdr);
 388         struct nlattr *tb[__RTA_MAX];
 389
 390         if (r->rtm_protocol == RTPROT_KERNEL &&
 391             r->rtm_family == AF_INET6)
 392                 return false;
 393
 394         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 395         if (!tb[RTA_OIF])
 396                 return false;
 397
 398         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 399 }
 400
 401 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 402 {
 403         return true;
 404 }
 405
 406 static int cb_clear_event(struct nl_msg *msg, void *arg)
 407 {
 408         struct clear_data *clr = arg;
 409         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 410         bool (*cb)(struct nlmsghdr *, int ifindex);
 411         int type;
 412
 413         switch(clr->type) {
 414         case RTM_GETADDR:
 415                 type = RTM_DELADDR;
 416                 if (hdr->nlmsg_type != RTM_NEWADDR)
 417                         return NL_SKIP;
 418
 419                 cb = check_ifaddr;
 420                 break;
 421         case RTM_GETROUTE:
 422                 type = RTM_DELROUTE;
 423                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 424                         return NL_SKIP;
 425
 426                 cb = check_route;
 427                 break;
 428         case RTM_GETRULE:
 429                 type = RTM_DELRULE;
 430                 if (hdr->nlmsg_type != RTM_NEWRULE)
 431                         return NL_SKIP;
 432
 433                 cb = check_rule;
 434                 break;
 435         default:
 436                 return NL_SKIP;
 437         }
 438
 439         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 440                 return NL_SKIP;
 441
 442         if (type == RTM_DELRULE)
 443                 D(SYSTEM, "Remove a rule\n");
 444         else
 445                 D(SYSTEM, "Remove %s from device %s\n",
 446                   type == RTM_DELADDR ? "an address" : "a route",
 447                   clr->dev->ifname);
 448         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 449         hdr = nlmsg_hdr(clr->msg);
 450         hdr->nlmsg_type = type;
 451         hdr->nlmsg_flags = NLM_F_REQUEST;
 452
 453         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 454                 nl_wait_for_ack(sock_rtnl);
 455
 456         return NL_SKIP;
 457 }
 458
 459 static int
 460 cb_finish_event(struct nl_msg *msg, void *arg)
 461 {
 462         int *pending = arg;
 463         *pending = 0;
 464         return NL_STOP;
 465 }
 466
 467 static int
 468 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 469 {
 470         int *pending = arg;
 471         *pending = err->error;
 472         return NL_STOP;
 473 }
 474
 475 static void
 476 system_if_clear_entries(struct device *dev, int type, int af)
 477 {
 478         struct clear_data clr;
 479         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 480         struct rtmsg rtm = {
 481                 .rtm_family = af,
 482                 .rtm_flags = RTM_F_CLONED,
 483         };
 484         int flags = NLM_F_DUMP;
 485         int pending = 1;
 486
 487         clr.af = af;
 488         clr.dev = dev;
 489         clr.type = type;
 490         switch (type) {
 491         case RTM_GETADDR:
 492         case RTM_GETRULE:
 493                 clr.size = sizeof(struct rtgenmsg);
 494                 break;
 495         case RTM_GETROUTE:
 496                 clr.size = sizeof(struct rtmsg);
 497                 break;
 498         default:
 499                 return;
 500         }
 501
 502         if (!cb)
 503                 return;
 504
 505         clr.msg = nlmsg_alloc_simple(type, flags);
 506         if (!clr.msg)
 507                 goto out;
 508
 509         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 510         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 511         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 512         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 513
 514         nl_send_auto_complete(sock_rtnl, clr.msg);
 515         while (pending > 0)
 516                 nl_recvmsgs(sock_rtnl, cb);
 517
 518         nlmsg_free(clr.msg);
 519 out:
 520         nl_cb_put(cb);
 521 }
 522
 523 /*
 524  * Clear bridge (membership) state and bring down device
 525  */
 526 void system_if_clear_state(struct device *dev)
 527 {
 528         static char buf[256];
 529         char *bridge;
 530
 531         if (dev->external)
 532                 return;
 533
 534         dev->ifindex = system_if_resolve(dev);
 535         if (!dev->ifindex)
 536                 return;
 537
 538         system_if_flags(dev->ifname, 0, IFF_UP);
 539
 540         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 541                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 542                 system_bridge_delbr(dev);
 543                 return;
 544         }
 545
 546         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 547         if (bridge) {
 548                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 549                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 550         }
 551
 552         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 553         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 554         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 555         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 556         system_set_disable_ipv6(dev, "0");
 557 }
 558
 559 static inline unsigned long
 560 sec_to_jiffies(int val)
 561 {
 562         return (unsigned long) val * 100;
 563 }
 564
 565 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 566 {
 567         unsigned long args[4] = {};
 568
 569         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 570                 return -1;
 571
 572         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 573         args[1] = !!cfg->stp;
 574         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 575
 576         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 577         args[1] = sec_to_jiffies(cfg->forward_delay);
 578         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 579
 580         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 581                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 582
 583         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 584                 args[0] = BRCTL_SET_AGEING_TIME;
 585                 args[1] = sec_to_jiffies(cfg->ageing_time);
 586                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 587         }
 588
 589         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 590                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 591                 args[1] = sec_to_jiffies(cfg->hello_time);
 592                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 593         }
 594
 595         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 596                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 597                 args[1] = sec_to_jiffies(cfg->max_age);
 598                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 599         }
 600
 601         return 0;
 602 }
 603
 604 static int system_vlan(struct device *dev, int id)
 605 {
 606         struct vlan_ioctl_args ifr = {
 607                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 608                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 609         };
 610
 611         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 612
 613         if (id < 0) {
 614                 ifr.cmd = DEL_VLAN_CMD;
 615                 ifr.u.VID = 0;
 616         } else {
 617                 ifr.cmd = ADD_VLAN_CMD;
 618                 ifr.u.VID = id;
 619         }
 620         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 621         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 622 }
 623
 624 int system_vlan_add(struct device *dev, int id)
 625 {
 626         return system_vlan(dev, id);
 627 }
 628
 629 int system_vlan_del(struct device *dev)
 630 {
 631         return system_vlan(dev, -1);
 632 }
 633
 634 static void
 635 system_if_get_settings(struct device *dev, struct device_settings *s)
 636 {
 637         struct ifreq ifr;
 638
 639         memset(&ifr, 0, sizeof(ifr));
 640         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 641
 642         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 643                 s->mtu = ifr.ifr_mtu;
 644                 s->flags |= DEV_OPT_MTU;
 645         }
 646
 647         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 648                 s->txqueuelen = ifr.ifr_qlen;
 649                 s->flags |= DEV_OPT_TXQUEUELEN;
 650         }
 651
 652         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 653                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 654                 s->flags |= DEV_OPT_MACADDR;
 655         }
 656 }
 657
 658 void
 659 system_if_apply_settings(struct device *dev, struct device_settings *s)
 660 {
 661         struct ifreq ifr;
 662
 663         memset(&ifr, 0, sizeof(ifr));
 664         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 665         if (s->flags & DEV_OPT_MTU) {
 666                 ifr.ifr_mtu = s->mtu;
 667                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 668                         s->flags &= ~DEV_OPT_MTU;
 669         }
 670         if (s->flags & DEV_OPT_TXQUEUELEN) {
 671                 ifr.ifr_qlen = s->txqueuelen;
 672                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 673                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 674         }
 675         if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
 676                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 677                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 678                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 679                         s->flags &= ~DEV_OPT_MACADDR;
 680         }
 681 }
 682
 683 int system_if_up(struct device *dev)
 684 {
 685         system_if_get_settings(dev, &dev->orig_settings);
 686         system_if_apply_settings(dev, &dev->settings);
 687         dev->ifindex = system_if_resolve(dev);
 688         return system_if_flags(dev->ifname, IFF_UP, 0);
 689 }
 690
 691 int system_if_down(struct device *dev)
 692 {
 693         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 694         dev->orig_settings.flags &= dev->settings.flags;
 695         system_if_apply_settings(dev, &dev->orig_settings);
 696         return ret;
 697 }
 698
 699 int system_if_check(struct device *dev)
 700 {
 701         device_set_present(dev, (system_if_resolve(dev) > 0));
 702         return 0;
 703 }
 704
 705 struct device *
 706 system_if_get_parent(struct device *dev)
 707 {
 708         char buf[64], *devname;
 709         int ifindex, iflink, len;
 710         FILE *f;
 711
 712         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 713         f = fopen(buf, "r");
 714         if (!f)
 715                 return NULL;
 716
 717         len = fread(buf, 1, sizeof(buf) - 1, f);
 718         fclose(f);
 719
 720         if (len <= 0)
 721                 return NULL;
 722
 723         buf[len] = 0;
 724         iflink = strtoul(buf, NULL, 0);
 725         ifindex = system_if_resolve(dev);
 726         if (!iflink || iflink == ifindex)
 727                 return NULL;
 728
 729         devname = if_indextoname(iflink, buf);
 730         if (!devname)
 731                 return NULL;
 732
 733         return device_get(devname, true);
 734 }
 735
 736 static bool
 737 read_string_file(int dir_fd, const char *file, char *buf, int len)
 738 {
 739         bool ret = false;
 740         char *c;
 741         int fd;
 742
 743         fd = openat(dir_fd, file, O_RDONLY);
 744         if (fd < 0)
 745                 return false;
 746
 747 retry:
 748         len = read(fd, buf, len - 1);
 749         if (len < 0) {
 750                 if (errno == EINTR)
 751                         goto retry;
 752         } else if (len > 0) {
 753                         buf[len] = 0;
 754
 755                         c = strchr(buf, '\n');
 756                         if (c)
 757                                 *c = 0;
 758
 759                         ret = true;
 760         }
 761
 762         close(fd);
 763
 764         return ret;
 765 }
 766
 767 static bool
 768 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
 769 {
 770         char buf[64];
 771         bool ret = false;
 772
 773         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 774         if (ret)
 775                 *val = strtoull(buf, NULL, 0);
 776
 777         return ret;
 778 }
 779
 780 /* Assume advertised flags == supported flags */
 781 static const struct {
 782         uint32_t mask;
 783         const char *name;
 784 } ethtool_link_modes[] = {
 785         { ADVERTISED_10baseT_Half, "10H" },
 786         { ADVERTISED_10baseT_Full, "10F" },
 787         { ADVERTISED_100baseT_Half, "100H" },
 788         { ADVERTISED_100baseT_Full, "100F" },
 789         { ADVERTISED_1000baseT_Half, "1000H" },
 790         { ADVERTISED_1000baseT_Full, "1000F" },
 791 };
 792
 793 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 794 {
 795         int i;
 796         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 797                 if (mask & ethtool_link_modes[i].mask)
 798                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 799         }
 800 }
 801
 802 bool
 803 system_if_force_external(const char *ifname)
 804 {
 805         char buf[64];
 806         struct stat s;
 807
 808         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 809         return stat(buf, &s) == 0;
 810 }
 811
 812 int
 813 system_if_dump_info(struct device *dev, struct blob_buf *b)
 814 {
 815         struct ethtool_cmd ecmd;
 816         struct ifreq ifr;
 817         char buf[64], *s;
 818         void *c;
 819         int dir_fd;
 820         uint64_t val = 0;
 821
 822         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 823         dir_fd = open(buf, O_DIRECTORY);
 824
 825         if (read_uint64_file(dir_fd, "carrier", &val))
 826                 blobmsg_add_u8(b, "link", !!val);
 827
 828         memset(&ecmd, 0, sizeof(ecmd));
 829         memset(&ifr, 0, sizeof(ifr));
 830         strcpy(ifr.ifr_name, dev->ifname);
 831         ifr.ifr_data = (caddr_t) &ecmd;
 832         ecmd.cmd = ETHTOOL_GSET;
 833
 834         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 835                 c = blobmsg_open_array(b, "link-advertising");
 836                 system_add_link_modes(b, ecmd.advertising);
 837                 blobmsg_close_array(b, c);
 838
 839                 c = blobmsg_open_array(b, "link-supported");
 840                 system_add_link_modes(b, ecmd.supported);
 841                 blobmsg_close_array(b, c);
 842
 843                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 844                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 845                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 846                 blobmsg_add_string_buffer(b);
 847         }
 848
 849         close(dir_fd);
 850         return 0;
 851 }
 852
 853 int
 854 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 855 {
 856         const char *const counters[] = {
 857                 "collisions",     "rx_frame_errors",   "tx_compressed",
 858                 "multicast",      "rx_length_errors",  "tx_dropped",
 859                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 860                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 861                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 862                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 863                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 864                 "rx_fifo_errors", "tx_carrier_errors",
 865         };
 866         char buf[64];
 867         int stats_dir;
 868         int i;
 869         uint64_t val = 0;
 870
 871         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 872         stats_dir = open(buf, O_DIRECTORY);
 873         if (stats_dir < 0)
 874                 return -1;
 875
 876         for (i = 0; i < ARRAY_SIZE(counters); i++)
 877                 if (read_uint64_file(stats_dir, counters[i], &val))
 878                         blobmsg_add_u64(b, counters[i], val);
 879
 880         close(stats_dir);
 881         return 0;
 882 }
 883
 884 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 885 {
 886         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 887         int alen = v4 ? 4 : 16;
 888         unsigned int flags = 0;
 889         struct ifaddrmsg ifa = {
 890                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 891                 .ifa_prefixlen = addr->mask,
 892                 .ifa_index = dev->ifindex,
 893         };
 894
 895         struct nl_msg *msg;
 896         if (cmd == RTM_NEWADDR)
 897                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 898
 899         msg = nlmsg_alloc_simple(cmd, flags);
 900         if (!msg)
 901                 return -1;
 902
 903         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 904         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 905         if (v4) {
 906                 if (addr->broadcast)
 907                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 908                 if (addr->point_to_point)
 909                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 910         } else {
 911                 time_t now = system_get_rtime();
 912                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
 913
 914                 if (addr->preferred_until) {
 915                         int preferred = addr->preferred_until - now;
 916                         if (preferred < 0)
 917                                 preferred = 0;
 918
 919                         cinfo.ifa_prefered = preferred;
 920                 }
 921
 922                 if (addr->valid_until) {
 923                         int valid = addr->valid_until - now;
 924                         if (valid <= 0)
 925                                 return -1;
 926
 927                         cinfo.ifa_valid = valid;
 928                 }
 929
 930                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
 931         }
 932
 933         return system_rtnl_call(msg);
 934 }
 935
 936 int system_add_address(struct device *dev, struct device_addr *addr)
 937 {
 938         return system_addr(dev, addr, RTM_NEWADDR);
 939 }
 940
 941 int system_del_address(struct device *dev, struct device_addr *addr)
 942 {
 943         return system_addr(dev, addr, RTM_DELADDR);
 944 }
 945
 946 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 947 {
 948         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 949         bool have_gw;
 950         unsigned int flags = 0;
 951
 952         if (alen == 4)
 953                 have_gw = !!route->nexthop.in.s_addr;
 954         else
 955                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 956                         route->nexthop.in6.s6_addr32[1] ||
 957                         route->nexthop.in6.s6_addr32[2] ||
 958                         route->nexthop.in6.s6_addr32[3];
 959
 960         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 961                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 962
 963         unsigned int table = (route->flags & DEVROUTE_TABLE) ? route->table : RT_TABLE_MAIN;
 964
 965         struct rtmsg rtm = {
 966                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 967                 .rtm_dst_len = route->mask,
 968                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
 969                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
 970                 .rtm_scope = scope,
 971                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 972         };
 973         struct nl_msg *msg;
 974
 975         if (cmd == RTM_NEWROUTE) {
 976                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 977
 978                 if (!dev) { // Add null-route
 979                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
 980                         rtm.rtm_type = RTN_UNREACHABLE;
 981                 }
 982         }
 983
 984         msg = nlmsg_alloc_simple(cmd, flags);
 985         if (!msg)
 986                 return -1;
 987
 988         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 989
 990         if (route->mask)
 991                 nla_put(msg, RTA_DST, alen, &route->addr);
 992
 993         if (route->metric > 0)
 994                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
 995
 996         if (have_gw)
 997                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 998
 999         if (dev)
1000                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1001
1002         if (table >= 256)
1003                 nla_put_u32(msg, RTA_TABLE, table);
1004
1005         return system_rtnl_call(msg);
1006 }
1007
1008 int system_add_route(struct device *dev, struct device_route *route)
1009 {
1010         return system_rt(dev, route, RTM_NEWROUTE);
1011 }
1012
1013 int system_del_route(struct device *dev, struct device_route *route)
1014 {
1015         return system_rt(dev, route, RTM_DELROUTE);
1016 }
1017
1018 int system_flush_routes(void)
1019 {
1020         const char *names[] = {
1021                 "/proc/sys/net/ipv4/route/flush",
1022                 "/proc/sys/net/ipv6/route/flush"
1023         };
1024         int fd, i;
1025
1026         for (i = 0; i < ARRAY_SIZE(names); i++) {
1027                 fd = open(names[i], O_WRONLY);
1028                 if (fd < 0)
1029                         continue;
1030
1031                 write(fd, "-1", 2);
1032                 close(fd);
1033         }
1034         return 0;
1035 }
1036
1037 bool system_resolve_rt_table(const char *name, unsigned int *id)
1038 {
1039         FILE *f;
1040         char *e, buf[128];
1041         unsigned int n, table = RT_TABLE_UNSPEC;
1042
1043         /* first try to parse table as number */
1044         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1045                 table = n;
1046
1047         /* handle well known aliases */
1048         else if (!strcmp(name, "default"))
1049                 table = RT_TABLE_DEFAULT;
1050         else if (!strcmp(name, "main"))
1051                 table = RT_TABLE_MAIN;
1052         else if (!strcmp(name, "local"))
1053                 table = RT_TABLE_LOCAL;
1054
1055         /* try to look up name in /etc/iproute2/rt_tables */
1056         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1057         {
1058                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1059                 {
1060                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1061                                 continue;
1062
1063                         n = strtoul(e, NULL, 10);
1064                         e = strtok(NULL, " \t\n");
1065
1066                         if (e && !strcmp(e, name))
1067                         {
1068                                 table = n;
1069                                 break;
1070                         }
1071                 }
1072
1073                 fclose(f);
1074         }
1075
1076         if (table == RT_TABLE_UNSPEC)
1077                 return false;
1078
1079         /* do not consider main table special */
1080         if (table == RT_TABLE_MAIN)
1081                 table = RT_TABLE_UNSPEC;
1082
1083         *id = table;
1084         return true;
1085 }
1086
1087 static int system_iprule(struct iprule *rule, int cmd)
1088 {
1089         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1090
1091         struct nl_msg *msg;
1092         struct rtmsg rtm = {
1093                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1094                 .rtm_protocol = RTPROT_STATIC,
1095                 .rtm_scope = RT_SCOPE_UNIVERSE,
1096                 .rtm_table = RT_TABLE_UNSPEC,
1097                 .rtm_type = RTN_UNSPEC,
1098                 .rtm_flags = 0,
1099         };
1100
1101         if (cmd == RTM_NEWRULE) {
1102                 rtm.rtm_type = RTN_UNICAST;
1103                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1104         }
1105
1106         if (rule->invert)
1107                 rtm.rtm_flags |= FIB_RULE_INVERT;
1108
1109         if (rule->flags & IPRULE_SRC)
1110                 rtm.rtm_src_len = rule->src_mask;
1111
1112         if (rule->flags & IPRULE_DEST)
1113                 rtm.rtm_dst_len = rule->dest_mask;
1114
1115         if (rule->flags & IPRULE_TOS)
1116                 rtm.rtm_tos = rule->tos;
1117
1118         if (rule->flags & IPRULE_LOOKUP) {
1119                 if (rule->lookup < 256)
1120                         rtm.rtm_table = rule->lookup;
1121         }
1122
1123         if (rule->flags & IPRULE_ACTION)
1124                 rtm.rtm_type = rule->action;
1125         else if (rule->flags & IPRULE_GOTO)
1126                 rtm.rtm_type = FR_ACT_GOTO;
1127         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1128                 rtm.rtm_type = FR_ACT_NOP;
1129
1130         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1131
1132         if (!msg)
1133                 return -1;
1134
1135         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1136
1137         if (rule->flags & IPRULE_IN)
1138                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1139
1140         if (rule->flags & IPRULE_OUT)
1141                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1142
1143         if (rule->flags & IPRULE_SRC)
1144                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1145
1146         if (rule->flags & IPRULE_DEST)
1147                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1148
1149         if (rule->flags & IPRULE_PRIORITY)
1150                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1151
1152         if (rule->flags & IPRULE_FWMARK)
1153                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1154
1155         if (rule->flags & IPRULE_FWMASK)
1156                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1157
1158         if (rule->flags & IPRULE_LOOKUP) {
1159                 if (rule->lookup >= 256)
1160                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1161         }
1162
1163         if (rule->flags & IPRULE_GOTO)
1164                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1165
1166         return system_rtnl_call(msg);
1167 }
1168
1169 int system_add_iprule(struct iprule *rule)
1170 {
1171         return system_iprule(rule, RTM_NEWRULE);
1172 }
1173
1174 int system_del_iprule(struct iprule *rule)
1175 {
1176         return system_iprule(rule, RTM_DELRULE);
1177 }
1178
1179 int system_flush_iprules(void)
1180 {
1181         int rv = 0;
1182         struct iprule rule;
1183
1184         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1185         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1186
1187         memset(&rule, 0, sizeof(rule));
1188
1189
1190         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1191
1192         rule.priority = 0;
1193         rule.lookup = RT_TABLE_LOCAL;
1194         rv |= system_iprule(&rule, RTM_NEWRULE);
1195
1196         rule.priority = 32766;
1197         rule.lookup = RT_TABLE_MAIN;
1198         rv |= system_iprule(&rule, RTM_NEWRULE);
1199
1200         rule.priority = 32767;
1201         rule.lookup = RT_TABLE_DEFAULT;
1202         rv |= system_iprule(&rule, RTM_NEWRULE);
1203
1204
1205         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1206
1207         rule.priority = 0;
1208         rule.lookup = RT_TABLE_LOCAL;
1209         rv |= system_iprule(&rule, RTM_NEWRULE);
1210
1211         rule.priority = 32766;
1212         rule.lookup = RT_TABLE_MAIN;
1213         rv |= system_iprule(&rule, RTM_NEWRULE);
1214
1215         return rv;
1216 }
1217
1218 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1219 {
1220         char *e;
1221         unsigned int n;
1222
1223         if (!strcmp(action, "local"))
1224                 n = RTN_LOCAL;
1225         else if (!strcmp(action, "nat"))
1226                 n = RTN_NAT;
1227         else if (!strcmp(action, "broadcast"))
1228                 n = RTN_BROADCAST;
1229         else if (!strcmp(action, "anycast"))
1230                 n = RTN_ANYCAST;
1231         else if (!strcmp(action, "multicast"))
1232                 n = RTN_MULTICAST;
1233         else if (!strcmp(action, "prohibit"))
1234                 n = RTN_PROHIBIT;
1235         else if (!strcmp(action, "unreachable"))
1236                 n = RTN_UNREACHABLE;
1237         else if (!strcmp(action, "blackhole"))
1238                 n = RTN_BLACKHOLE;
1239         else if (!strcmp(action, "xresolve"))
1240                 n = RTN_XRESOLVE;
1241         else if (!strcmp(action, "unicast"))
1242                 n = RTN_UNICAST;
1243         else if (!strcmp(action, "throw"))
1244                 n = RTN_THROW;
1245         else {
1246                 n = strtoul(action, &e, 0);
1247                 if (!e || *e || e == action || n > 255)
1248                         return false;
1249         }
1250
1251         *id = n;
1252         return true;
1253 }
1254
1255 time_t system_get_rtime(void)
1256 {
1257         struct timespec ts;
1258         struct timeval tv;
1259
1260         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1261                 return ts.tv_sec;
1262
1263         if (gettimeofday(&tv, NULL) == 0)
1264                 return tv.tv_sec;
1265
1266         return 0;
1267 }
1268
1269 #ifndef IP_DF
1270 #define IP_DF       0x4000
1271 #endif
1272
1273 static void tunnel_parm_init(struct ip_tunnel_parm *p)
1274 {
1275         memset(p, 0, sizeof(*p));
1276         p->iph.version = 4;
1277         p->iph.ihl = 5;
1278         p->iph.frag_off = htons(IP_DF);
1279 }
1280
1281 static int tunnel_ioctl(const char *name, int cmd, void *p)
1282 {
1283         struct ifreq ifr;
1284
1285         memset(&ifr, 0, sizeof(ifr));
1286         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1287         ifr.ifr_ifru.ifru_data = p;
1288         return ioctl(sock_ioctl, cmd, &ifr);
1289 }
1290
1291 int system_del_ip_tunnel(const char *name)
1292 {
1293         struct ip_tunnel_parm p;
1294
1295         tunnel_parm_init(&p);
1296         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
1297 }
1298
1299 int system_update_ipv6_mtu(struct device *dev, int mtu)
1300 {
1301         int ret = -1;
1302         char buf[64];
1303         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1304                         dev->ifname);
1305
1306         int fd = open(buf, O_RDWR);
1307         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1308         if (len < 0)
1309                 goto out;
1310
1311         buf[len] = 0;
1312         ret = atoi(buf);
1313
1314         if (!mtu || ret <= mtu)
1315                 goto out;
1316
1317         lseek(fd, 0, SEEK_SET);
1318         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1319                 ret = -1;
1320
1321 out:
1322         close(fd);
1323         return ret;
1324 }
1325
1326 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1327 {
1328         if (!attr)
1329                 return 1;
1330
1331         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
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         struct ip_tunnel_parm p;
1340         const char *base, *str;
1341         bool is_sit;
1342
1343         system_del_ip_tunnel(name);
1344
1345         tunnel_parm_init(&p);
1346
1347         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1348                 blob_data(attr), blob_len(attr));
1349
1350         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1351                 return -EINVAL;
1352         str = blobmsg_data(cur);
1353         is_sit = !strcmp(str, "sit");
1354
1355         if (is_sit) {
1356                 p.iph.protocol = IPPROTO_IPV6;
1357                 base = "sit0";
1358         } else
1359                 return -EINVAL;
1360
1361         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1362                 return -EINVAL;
1363
1364         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1365                 return -EINVAL;
1366
1367         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1368                 unsigned int val = blobmsg_get_u32(cur);
1369
1370                 if (val > 255)
1371                         return -EINVAL;
1372
1373                 p.iph.ttl = val;
1374         }
1375
1376         strncpy(p.name, name, sizeof(p.name));
1377         if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
1378                 return -1;
1379
1380 #ifdef SIOCADD6RD
1381         cur = tb[TUNNEL_ATTR_6RD_PREFIX];
1382         if (cur && is_sit) {
1383                 unsigned int mask;
1384                 struct ip_tunnel_6rd p6;
1385
1386                 memset(&p6, 0, sizeof(p6));
1387
1388                 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1389                                         &p6.prefix, &mask) || mask > 128)
1390                         return -EINVAL;
1391                 p6.prefixlen = mask;
1392
1393                 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1394                         if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1395                                                 &p6.relay_prefix, &mask) || mask > 32)
1396                                 return -EINVAL;
1397                         p6.relay_prefixlen = mask;
1398                 }
1399
1400                 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1401                         system_del_ip_tunnel(name);
1402                         return -1;
1403                 }
1404         }
1405 #endif
1406
1407         return 0;
1408 }