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/ethtool.h>
  36 #include <linux/fib_rules.h>
  37
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <fcntl.h>
  41 #include <glob.h>
  42 #include <time.h>
  43
  44 #include <netlink/msg.h>
  45 #include <netlink/attr.h>
  46 #include <netlink/socket.h>
  47 #include <libubox/uloop.h>
  48
  49 #include "netifd.h"
  50 #include "device.h"
  51 #include "system.h"
  52
  53 struct event_socket {
  54         struct uloop_fd uloop;
  55         struct nl_sock *sock;
  56         struct nl_cb *cb;
  57 };
  58
  59 static int sock_ioctl = -1;
  60 static struct nl_sock *sock_rtnl = NULL;
  61
  62 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  63 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  64
  65 static char dev_buf[256];
  66
  67 static void
  68 handler_nl_event(struct uloop_fd *u, unsigned int events)
  69 {
  70         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  71         nl_recvmsgs(ev->sock, ev->cb);
  72 }
  73
  74 static struct nl_sock *
  75 create_socket(int protocol, int groups)
  76 {
  77         struct nl_sock *sock;
  78
  79         sock = nl_socket_alloc();
  80         if (!sock)
  81                 return NULL;
  82
  83         if (groups)
  84                 nl_join_groups(sock, groups);
  85
  86         if (nl_connect(sock, protocol))
  87                 return NULL;
  88
  89         return sock;
  90 }
  91
  92 static bool
  93 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
  94                         uloop_fd_handler cb)
  95 {
  96         ev->sock = create_socket(protocol, groups);
  97         if (!ev->sock)
  98                 return false;
  99
 100         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 101         ev->uloop.cb = cb;
 102         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
 103         return true;
 104 }
 105
 106 static bool
 107 create_event_socket(struct event_socket *ev, int protocol,
 108                     int (*cb)(struct nl_msg *msg, void *arg))
 109 {
 110         // Prepare socket for link events
 111         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
 112         if (!ev->cb)
 113                 return false;
 114
 115         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 116
 117         return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
 118 }
 119
 120 int system_init(void)
 121 {
 122         static struct event_socket rtnl_event;
 123         static struct event_socket hotplug_event;
 124
 125         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 126         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
 127
 128         // Prepare socket for routing / address control
 129         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 130         if (!sock_rtnl)
 131                 return -1;
 132
 133         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 134                 return -1;
 135
 136         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 137                                      handle_hotplug_event))
 138                 return -1;
 139
 140         // Receive network link events form kernel
 141         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 142
 143         return 0;
 144 }
 145
 146 static void system_set_sysctl(const char *path, const char *val)
 147 {
 148         int fd;
 149
 150         fd = open(path, O_WRONLY);
 151         if (fd < 0)
 152                 return;
 153
 154         write(fd, val, strlen(val));
 155         close(fd);
 156 }
 157
 158 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 159 {
 160         snprintf(dev_buf, sizeof(dev_buf), path, device);
 161         system_set_sysctl(dev_buf, val);
 162 }
 163
 164 static void system_set_disable_ipv6(struct device *dev, const char *val)
 165 {
 166         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 167 }
 168
 169 // Evaluate netlink messages
 170 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 171 {
 172         struct nlmsghdr *nh = nlmsg_hdr(msg);
 173         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 174         struct nlattr *nla[__IFLA_MAX];
 175
 176         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 177                 goto out;
 178
 179         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 180         if (!nla[IFLA_IFNAME])
 181                 goto out;
 182
 183         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 184         if (!dev)
 185                 goto out;
 186
 187         dev->ifindex = ifi->ifi_index;
 188         /* TODO: parse link status */
 189
 190 out:
 191         return 0;
 192 }
 193
 194 static void
 195 handle_hotplug_msg(char *data, int size)
 196 {
 197         const char *subsystem = NULL, *interface = NULL;
 198         char *cur, *end, *sep;
 199         struct device *dev;
 200         int skip;
 201         bool add;
 202
 203         if (!strncmp(data, "add@", 4))
 204                 add = true;
 205         else if (!strncmp(data, "remove@", 7))
 206                 add = false;
 207         else
 208                 return;
 209
 210         skip = strlen(data) + 1;
 211         end = data + size;
 212
 213         for (cur = data + skip; cur < end; cur += skip) {
 214                 skip = strlen(cur) + 1;
 215
 216                 sep = strchr(cur, '=');
 217                 if (!sep)
 218                         continue;
 219
 220                 *sep = 0;
 221                 if (!strcmp(cur, "INTERFACE"))
 222                         interface = sep + 1;
 223                 else if (!strcmp(cur, "SUBSYSTEM")) {
 224                         subsystem = sep + 1;
 225                         if (strcmp(subsystem, "net") != 0)
 226                                 return;
 227                 }
 228                 if (subsystem && interface)
 229                         goto found;
 230         }
 231         return;
 232
 233 found:
 234         dev = device_get(interface, false);
 235         if (!dev)
 236                 return;
 237
 238         if (dev->type != &simple_device_type)
 239                 return;
 240
 241         if (add && system_if_force_external(dev->ifname))
 242                 return;
 243
 244         device_set_present(dev, add);
 245 }
 246
 247 static void
 248 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 249 {
 250         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 251         struct sockaddr_nl nla;
 252         unsigned char *buf = NULL;
 253         int size;
 254
 255         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 256                 if (nla.nl_pid == 0)
 257                         handle_hotplug_msg((char *) buf, size);
 258
 259                 free(buf);
 260         }
 261 }
 262
 263 static int system_rtnl_call(struct nl_msg *msg)
 264 {
 265         int ret;
 266
 267         ret = nl_send_auto_complete(sock_rtnl, msg);
 268         nlmsg_free(msg);
 269
 270         if (ret < 0)
 271                 return ret;
 272
 273         return nl_wait_for_ack(sock_rtnl);
 274 }
 275
 276 int system_bridge_delbr(struct device *bridge)
 277 {
 278         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 279 }
 280
 281 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 282 {
 283         struct ifreq ifr;
 284
 285         memset(&ifr, 0, sizeof(ifr));
 286         if (dev)
 287                 ifr.ifr_ifindex = dev->ifindex;
 288         else
 289                 ifr.ifr_data = data;
 290         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 291         return ioctl(sock_ioctl, cmd, &ifr);
 292 }
 293
 294 static bool system_is_bridge(const char *name, char *buf, int buflen)
 295 {
 296         struct stat st;
 297
 298         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 299         if (stat(buf, &st) < 0)
 300                 return false;
 301
 302         return true;
 303 }
 304
 305 static char *system_get_bridge(const char *name, char *buf, int buflen)
 306 {
 307         char *path;
 308         ssize_t len;
 309         glob_t gl;
 310
 311         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 312         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 313                 return NULL;
 314
 315         if (gl.gl_pathc == 0)
 316                 return NULL;
 317
 318         len = readlink(gl.gl_pathv[0], buf, buflen);
 319         if (len < 0)
 320                 return NULL;
 321
 322         buf[len] = 0;
 323         path = strrchr(buf, '/');
 324         if (!path)
 325                 return NULL;
 326
 327         return path + 1;
 328 }
 329
 330 int system_bridge_addif(struct device *bridge, struct device *dev)
 331 {
 332         char *oldbr;
 333
 334         system_set_disable_ipv6(dev, "1");
 335         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 336         if (oldbr && !strcmp(oldbr, bridge->ifname))
 337                 return 0;
 338
 339         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 340 }
 341
 342 int system_bridge_delif(struct device *bridge, struct device *dev)
 343 {
 344         system_set_disable_ipv6(dev, "0");
 345         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 346 }
 347
 348 static int system_if_resolve(struct device *dev)
 349 {
 350         struct ifreq ifr;
 351         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 352         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 353                 return ifr.ifr_ifindex;
 354         else
 355                 return 0;
 356 }
 357
 358 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 359 {
 360         struct ifreq ifr;
 361
 362         memset(&ifr, 0, sizeof(ifr));
 363         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 364         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 365         ifr.ifr_flags |= add;
 366         ifr.ifr_flags &= ~rem;
 367         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 368 }
 369
 370 struct clear_data {
 371         struct nl_msg *msg;
 372         struct device *dev;
 373         int type;
 374         int size;
 375         int af;
 376 };
 377
 378
 379 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 380 {
 381         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 382
 383         return ifa->ifa_index == ifindex;
 384 }
 385
 386 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 387 {
 388         struct rtmsg *r = NLMSG_DATA(hdr);
 389         struct nlattr *tb[__RTA_MAX];
 390
 391         if (r->rtm_protocol == RTPROT_KERNEL &&
 392             r->rtm_family == AF_INET6)
 393                 return false;
 394
 395         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 396         if (!tb[RTA_OIF])
 397                 return false;
 398
 399         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 400 }
 401
 402 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 403 {
 404         return true;
 405 }
 406
 407 static int cb_clear_event(struct nl_msg *msg, void *arg)
 408 {
 409         struct clear_data *clr = arg;
 410         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 411         bool (*cb)(struct nlmsghdr *, int ifindex);
 412         int type;
 413
 414         switch(clr->type) {
 415         case RTM_GETADDR:
 416                 type = RTM_DELADDR;
 417                 if (hdr->nlmsg_type != RTM_NEWADDR)
 418                         return NL_SKIP;
 419
 420                 cb = check_ifaddr;
 421                 break;
 422         case RTM_GETROUTE:
 423                 type = RTM_DELROUTE;
 424                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 425                         return NL_SKIP;
 426
 427                 cb = check_route;
 428                 break;
 429         case RTM_GETRULE:
 430                 type = RTM_DELRULE;
 431                 if (hdr->nlmsg_type != RTM_NEWRULE)
 432                         return NL_SKIP;
 433
 434                 cb = check_rule;
 435                 break;
 436         default:
 437                 return NL_SKIP;
 438         }
 439
 440         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 441                 return NL_SKIP;
 442
 443         if (type == RTM_DELRULE)
 444                 D(SYSTEM, "Remove a rule\n");
 445         else
 446                 D(SYSTEM, "Remove %s from device %s\n",
 447                   type == RTM_DELADDR ? "an address" : "a route",
 448                   clr->dev->ifname);
 449         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 450         hdr = nlmsg_hdr(clr->msg);
 451         hdr->nlmsg_type = type;
 452         hdr->nlmsg_flags = NLM_F_REQUEST;
 453
 454         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 455                 nl_wait_for_ack(sock_rtnl);
 456
 457         return NL_SKIP;
 458 }
 459
 460 static int
 461 cb_finish_event(struct nl_msg *msg, void *arg)
 462 {
 463         int *pending = arg;
 464         *pending = 0;
 465         return NL_STOP;
 466 }
 467
 468 static int
 469 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 470 {
 471         int *pending = arg;
 472         *pending = err->error;
 473         return NL_STOP;
 474 }
 475
 476 static void
 477 system_if_clear_entries(struct device *dev, int type, int af)
 478 {
 479         struct clear_data clr;
 480         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 481         struct rtmsg rtm = {
 482                 .rtm_family = af,
 483                 .rtm_flags = RTM_F_CLONED,
 484         };
 485         int flags = NLM_F_DUMP;
 486         int pending = 1;
 487
 488         clr.af = af;
 489         clr.dev = dev;
 490         clr.type = type;
 491         switch (type) {
 492         case RTM_GETADDR:
 493         case RTM_GETRULE:
 494                 clr.size = sizeof(struct rtgenmsg);
 495                 break;
 496         case RTM_GETROUTE:
 497                 clr.size = sizeof(struct rtmsg);
 498                 break;
 499         default:
 500                 return;
 501         }
 502
 503         if (!cb)
 504                 return;
 505
 506         clr.msg = nlmsg_alloc_simple(type, flags);
 507         if (!clr.msg)
 508                 goto out;
 509
 510         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 511         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 512         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 513         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 514
 515         nl_send_auto_complete(sock_rtnl, clr.msg);
 516         while (pending > 0)
 517                 nl_recvmsgs(sock_rtnl, cb);
 518
 519         nlmsg_free(clr.msg);
 520 out:
 521         nl_cb_put(cb);
 522 }
 523
 524 /*
 525  * Clear bridge (membership) state and bring down device
 526  */
 527 void system_if_clear_state(struct device *dev)
 528 {
 529         static char buf[256];
 530         char *bridge;
 531
 532         if (dev->external)
 533                 return;
 534
 535         dev->ifindex = system_if_resolve(dev);
 536         if (!dev->ifindex)
 537                 return;
 538
 539         system_if_flags(dev->ifname, 0, IFF_UP);
 540
 541         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 542                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 543                 system_bridge_delbr(dev);
 544                 return;
 545         }
 546
 547         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 548         if (bridge) {
 549                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 550                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 551         }
 552
 553         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 554         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 555         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 556         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 557         system_set_disable_ipv6(dev, "0");
 558 }
 559
 560 static inline unsigned long
 561 sec_to_jiffies(int val)
 562 {
 563         return (unsigned long) val * 100;
 564 }
 565
 566 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 567 {
 568         unsigned long args[4] = {};
 569
 570         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 571                 return -1;
 572
 573         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 574         args[1] = !!cfg->stp;
 575         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 576
 577         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 578         args[1] = sec_to_jiffies(cfg->forward_delay);
 579         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 580
 581         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 582                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 583
 584         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 585         args[1] = cfg->priority;
 586         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 587
 588         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 589                 args[0] = BRCTL_SET_AGEING_TIME;
 590                 args[1] = sec_to_jiffies(cfg->ageing_time);
 591                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 592         }
 593
 594         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 595                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 596                 args[1] = sec_to_jiffies(cfg->hello_time);
 597                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 598         }
 599
 600         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 601                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 602                 args[1] = sec_to_jiffies(cfg->max_age);
 603                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 604         }
 605
 606         return 0;
 607 }
 608
 609 static int system_vlan(struct device *dev, int id)
 610 {
 611         struct vlan_ioctl_args ifr = {
 612                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 613                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 614         };
 615
 616         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 617
 618         if (id < 0) {
 619                 ifr.cmd = DEL_VLAN_CMD;
 620                 ifr.u.VID = 0;
 621         } else {
 622                 ifr.cmd = ADD_VLAN_CMD;
 623                 ifr.u.VID = id;
 624         }
 625         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 626         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 627 }
 628
 629 int system_vlan_add(struct device *dev, int id)
 630 {
 631         return system_vlan(dev, id);
 632 }
 633
 634 int system_vlan_del(struct device *dev)
 635 {
 636         return system_vlan(dev, -1);
 637 }
 638
 639 static void
 640 system_if_get_settings(struct device *dev, struct device_settings *s)
 641 {
 642         struct ifreq ifr;
 643
 644         memset(&ifr, 0, sizeof(ifr));
 645         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 646
 647         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 648                 s->mtu = ifr.ifr_mtu;
 649                 s->flags |= DEV_OPT_MTU;
 650         }
 651
 652         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 653                 s->txqueuelen = ifr.ifr_qlen;
 654                 s->flags |= DEV_OPT_TXQUEUELEN;
 655         }
 656
 657         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 658                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 659                 s->flags |= DEV_OPT_MACADDR;
 660         }
 661 }
 662
 663 void
 664 system_if_apply_settings(struct device *dev, struct device_settings *s)
 665 {
 666         struct ifreq ifr;
 667
 668         memset(&ifr, 0, sizeof(ifr));
 669         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 670         if (s->flags & DEV_OPT_MTU) {
 671                 ifr.ifr_mtu = s->mtu;
 672                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 673                         s->flags &= ~DEV_OPT_MTU;
 674         }
 675         if (s->flags & DEV_OPT_TXQUEUELEN) {
 676                 ifr.ifr_qlen = s->txqueuelen;
 677                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 678                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 679         }
 680         if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
 681                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 682                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 683                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 684                         s->flags &= ~DEV_OPT_MACADDR;
 685         }
 686 }
 687
 688 int system_if_up(struct device *dev)
 689 {
 690         system_if_get_settings(dev, &dev->orig_settings);
 691         system_if_apply_settings(dev, &dev->settings);
 692         dev->ifindex = system_if_resolve(dev);
 693         return system_if_flags(dev->ifname, IFF_UP, 0);
 694 }
 695
 696 int system_if_down(struct device *dev)
 697 {
 698         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 699         dev->orig_settings.flags &= dev->settings.flags;
 700         system_if_apply_settings(dev, &dev->orig_settings);
 701         return ret;
 702 }
 703
 704 int system_if_check(struct device *dev)
 705 {
 706         device_set_present(dev, (system_if_resolve(dev) > 0));
 707         return 0;
 708 }
 709
 710 struct device *
 711 system_if_get_parent(struct device *dev)
 712 {
 713         char buf[64], *devname;
 714         int ifindex, iflink, len;
 715         FILE *f;
 716
 717         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 718         f = fopen(buf, "r");
 719         if (!f)
 720                 return NULL;
 721
 722         len = fread(buf, 1, sizeof(buf) - 1, f);
 723         fclose(f);
 724
 725         if (len <= 0)
 726                 return NULL;
 727
 728         buf[len] = 0;
 729         iflink = strtoul(buf, NULL, 0);
 730         ifindex = system_if_resolve(dev);
 731         if (!iflink || iflink == ifindex)
 732                 return NULL;
 733
 734         devname = if_indextoname(iflink, buf);
 735         if (!devname)
 736                 return NULL;
 737
 738         return device_get(devname, true);
 739 }
 740
 741 static bool
 742 read_string_file(int dir_fd, const char *file, char *buf, int len)
 743 {
 744         bool ret = false;
 745         char *c;
 746         int fd;
 747
 748         fd = openat(dir_fd, file, O_RDONLY);
 749         if (fd < 0)
 750                 return false;
 751
 752 retry:
 753         len = read(fd, buf, len - 1);
 754         if (len < 0) {
 755                 if (errno == EINTR)
 756                         goto retry;
 757         } else if (len > 0) {
 758                         buf[len] = 0;
 759
 760                         c = strchr(buf, '\n');
 761                         if (c)
 762                                 *c = 0;
 763
 764                         ret = true;
 765         }
 766
 767         close(fd);
 768
 769         return ret;
 770 }
 771
 772 static bool
 773 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
 774 {
 775         char buf[64];
 776         bool ret = false;
 777
 778         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 779         if (ret)
 780                 *val = strtoull(buf, NULL, 0);
 781
 782         return ret;
 783 }
 784
 785 /* Assume advertised flags == supported flags */
 786 static const struct {
 787         uint32_t mask;
 788         const char *name;
 789 } ethtool_link_modes[] = {
 790         { ADVERTISED_10baseT_Half, "10H" },
 791         { ADVERTISED_10baseT_Full, "10F" },
 792         { ADVERTISED_100baseT_Half, "100H" },
 793         { ADVERTISED_100baseT_Full, "100F" },
 794         { ADVERTISED_1000baseT_Half, "1000H" },
 795         { ADVERTISED_1000baseT_Full, "1000F" },
 796 };
 797
 798 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 799 {
 800         int i;
 801         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 802                 if (mask & ethtool_link_modes[i].mask)
 803                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 804         }
 805 }
 806
 807 bool
 808 system_if_force_external(const char *ifname)
 809 {
 810         char buf[64];
 811         struct stat s;
 812
 813         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 814         return stat(buf, &s) == 0;
 815 }
 816
 817 int
 818 system_if_dump_info(struct device *dev, struct blob_buf *b)
 819 {
 820         struct ethtool_cmd ecmd;
 821         struct ifreq ifr;
 822         char buf[64], *s;
 823         void *c;
 824         int dir_fd;
 825         uint64_t val = 0;
 826
 827         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 828         dir_fd = open(buf, O_DIRECTORY);
 829
 830         if (read_uint64_file(dir_fd, "carrier", &val))
 831                 blobmsg_add_u8(b, "link", !!val);
 832
 833         memset(&ecmd, 0, sizeof(ecmd));
 834         memset(&ifr, 0, sizeof(ifr));
 835         strcpy(ifr.ifr_name, dev->ifname);
 836         ifr.ifr_data = (caddr_t) &ecmd;
 837         ecmd.cmd = ETHTOOL_GSET;
 838
 839         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 840                 c = blobmsg_open_array(b, "link-advertising");
 841                 system_add_link_modes(b, ecmd.advertising);
 842                 blobmsg_close_array(b, c);
 843
 844                 c = blobmsg_open_array(b, "link-supported");
 845                 system_add_link_modes(b, ecmd.supported);
 846                 blobmsg_close_array(b, c);
 847
 848                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 849                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 850                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 851                 blobmsg_add_string_buffer(b);
 852         }
 853
 854         close(dir_fd);
 855         return 0;
 856 }
 857
 858 int
 859 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 860 {
 861         const char *const counters[] = {
 862                 "collisions",     "rx_frame_errors",   "tx_compressed",
 863                 "multicast",      "rx_length_errors",  "tx_dropped",
 864                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 865                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 866                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 867                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 868                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 869                 "rx_fifo_errors", "tx_carrier_errors",
 870         };
 871         char buf[64];
 872         int stats_dir;
 873         int i;
 874         uint64_t val = 0;
 875
 876         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 877         stats_dir = open(buf, O_DIRECTORY);
 878         if (stats_dir < 0)
 879                 return -1;
 880
 881         for (i = 0; i < ARRAY_SIZE(counters); i++)
 882                 if (read_uint64_file(stats_dir, counters[i], &val))
 883                         blobmsg_add_u64(b, counters[i], val);
 884
 885         close(stats_dir);
 886         return 0;
 887 }
 888
 889 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 890 {
 891         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 892         int alen = v4 ? 4 : 16;
 893         unsigned int flags = 0;
 894         struct ifaddrmsg ifa = {
 895                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 896                 .ifa_prefixlen = addr->mask,
 897                 .ifa_index = dev->ifindex,
 898         };
 899
 900         struct nl_msg *msg;
 901         if (cmd == RTM_NEWADDR)
 902                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 903
 904         msg = nlmsg_alloc_simple(cmd, flags);
 905         if (!msg)
 906                 return -1;
 907
 908         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 909         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 910         if (v4) {
 911                 if (addr->broadcast)
 912                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 913                 if (addr->point_to_point)
 914                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 915         } else {
 916                 time_t now = system_get_rtime();
 917                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
 918
 919                 if (addr->preferred_until) {
 920                         int preferred = addr->preferred_until - now;
 921                         if (preferred < 0)
 922                                 preferred = 0;
 923
 924                         cinfo.ifa_prefered = preferred;
 925                 }
 926
 927                 if (addr->valid_until) {
 928                         int valid = addr->valid_until - now;
 929                         if (valid <= 0)
 930                                 return -1;
 931
 932                         cinfo.ifa_valid = valid;
 933                 }
 934
 935                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
 936         }
 937
 938         return system_rtnl_call(msg);
 939 }
 940
 941 int system_add_address(struct device *dev, struct device_addr *addr)
 942 {
 943         return system_addr(dev, addr, RTM_NEWADDR);
 944 }
 945
 946 int system_del_address(struct device *dev, struct device_addr *addr)
 947 {
 948         return system_addr(dev, addr, RTM_DELADDR);
 949 }
 950
 951 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 952 {
 953         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 954         bool have_gw;
 955         unsigned int flags = 0;
 956
 957         if (alen == 4)
 958                 have_gw = !!route->nexthop.in.s_addr;
 959         else
 960                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 961                         route->nexthop.in6.s6_addr32[1] ||
 962                         route->nexthop.in6.s6_addr32[2] ||
 963                         route->nexthop.in6.s6_addr32[3];
 964
 965         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 966                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 967
 968         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
 969                         ? route->table : RT_TABLE_MAIN;
 970
 971         struct rtmsg rtm = {
 972                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 973                 .rtm_dst_len = route->mask,
 974                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
 975                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
 976                 .rtm_scope = scope,
 977                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 978         };
 979         struct nl_msg *msg;
 980
 981         if (cmd == RTM_NEWROUTE) {
 982                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 983
 984                 if (!dev) { // Add null-route
 985                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
 986                         rtm.rtm_type = RTN_UNREACHABLE;
 987                 }
 988         }
 989
 990         msg = nlmsg_alloc_simple(cmd, flags);
 991         if (!msg)
 992                 return -1;
 993
 994         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 995
 996         if (route->mask)
 997                 nla_put(msg, RTA_DST, alen, &route->addr);
 998
 999         if (route->metric > 0)
1000                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1001
1002         if (have_gw)
1003                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1004
1005         if (dev)
1006                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1007
1008         if (table >= 256)
1009                 nla_put_u32(msg, RTA_TABLE, table);
1010
1011         return system_rtnl_call(msg);
1012 }
1013
1014 int system_add_route(struct device *dev, struct device_route *route)
1015 {
1016         return system_rt(dev, route, RTM_NEWROUTE);
1017 }
1018
1019 int system_del_route(struct device *dev, struct device_route *route)
1020 {
1021         return system_rt(dev, route, RTM_DELROUTE);
1022 }
1023
1024 int system_flush_routes(void)
1025 {
1026         const char *names[] = {
1027                 "/proc/sys/net/ipv4/route/flush",
1028                 "/proc/sys/net/ipv6/route/flush"
1029         };
1030         int fd, i;
1031
1032         for (i = 0; i < ARRAY_SIZE(names); i++) {
1033                 fd = open(names[i], O_WRONLY);
1034                 if (fd < 0)
1035                         continue;
1036
1037                 write(fd, "-1", 2);
1038                 close(fd);
1039         }
1040         return 0;
1041 }
1042
1043 bool system_resolve_rt_table(const char *name, unsigned int *id)
1044 {
1045         FILE *f;
1046         char *e, buf[128];
1047         unsigned int n, table = RT_TABLE_UNSPEC;
1048
1049         /* first try to parse table as number */
1050         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1051                 table = n;
1052
1053         /* handle well known aliases */
1054         else if (!strcmp(name, "default"))
1055                 table = RT_TABLE_DEFAULT;
1056         else if (!strcmp(name, "main"))
1057                 table = RT_TABLE_MAIN;
1058         else if (!strcmp(name, "local"))
1059                 table = RT_TABLE_LOCAL;
1060
1061         /* try to look up name in /etc/iproute2/rt_tables */
1062         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1063         {
1064                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1065                 {
1066                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1067                                 continue;
1068
1069                         n = strtoul(e, NULL, 10);
1070                         e = strtok(NULL, " \t\n");
1071
1072                         if (e && !strcmp(e, name))
1073                         {
1074                                 table = n;
1075                                 break;
1076                         }
1077                 }
1078
1079                 fclose(f);
1080         }
1081
1082         if (table == RT_TABLE_UNSPEC)
1083                 return false;
1084
1085         /* do not consider main table special */
1086         if (table == RT_TABLE_MAIN)
1087                 table = RT_TABLE_UNSPEC;
1088
1089         *id = table;
1090         return true;
1091 }
1092
1093 static int system_iprule(struct iprule *rule, int cmd)
1094 {
1095         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1096
1097         struct nl_msg *msg;
1098         struct rtmsg rtm = {
1099                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1100                 .rtm_protocol = RTPROT_STATIC,
1101                 .rtm_scope = RT_SCOPE_UNIVERSE,
1102                 .rtm_table = RT_TABLE_UNSPEC,
1103                 .rtm_type = RTN_UNSPEC,
1104                 .rtm_flags = 0,
1105         };
1106
1107         if (cmd == RTM_NEWRULE) {
1108                 rtm.rtm_type = RTN_UNICAST;
1109                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1110         }
1111
1112         if (rule->invert)
1113                 rtm.rtm_flags |= FIB_RULE_INVERT;
1114
1115         if (rule->flags & IPRULE_SRC)
1116                 rtm.rtm_src_len = rule->src_mask;
1117
1118         if (rule->flags & IPRULE_DEST)
1119                 rtm.rtm_dst_len = rule->dest_mask;
1120
1121         if (rule->flags & IPRULE_TOS)
1122                 rtm.rtm_tos = rule->tos;
1123
1124         if (rule->flags & IPRULE_LOOKUP) {
1125                 if (rule->lookup < 256)
1126                         rtm.rtm_table = rule->lookup;
1127         }
1128
1129         if (rule->flags & IPRULE_ACTION)
1130                 rtm.rtm_type = rule->action;
1131         else if (rule->flags & IPRULE_GOTO)
1132                 rtm.rtm_type = FR_ACT_GOTO;
1133         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1134                 rtm.rtm_type = FR_ACT_NOP;
1135
1136         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1137
1138         if (!msg)
1139                 return -1;
1140
1141         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1142
1143         if (rule->flags & IPRULE_IN)
1144                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1145
1146         if (rule->flags & IPRULE_OUT)
1147                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1148
1149         if (rule->flags & IPRULE_SRC)
1150                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1151
1152         if (rule->flags & IPRULE_DEST)
1153                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1154
1155         if (rule->flags & IPRULE_PRIORITY)
1156                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1157         else if (cmd == RTM_NEWRULE)
1158                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1159
1160         if (rule->flags & IPRULE_FWMARK)
1161                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1162
1163         if (rule->flags & IPRULE_FWMASK)
1164                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1165
1166         if (rule->flags & IPRULE_LOOKUP) {
1167                 if (rule->lookup >= 256)
1168                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1169         }
1170
1171         if (rule->flags & IPRULE_GOTO)
1172                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1173
1174         return system_rtnl_call(msg);
1175 }
1176
1177 int system_add_iprule(struct iprule *rule)
1178 {
1179         return system_iprule(rule, RTM_NEWRULE);
1180 }
1181
1182 int system_del_iprule(struct iprule *rule)
1183 {
1184         return system_iprule(rule, RTM_DELRULE);
1185 }
1186
1187 int system_flush_iprules(void)
1188 {
1189         int rv = 0;
1190         struct iprule rule;
1191
1192         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1193         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1194
1195         memset(&rule, 0, sizeof(rule));
1196
1197
1198         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1199
1200         rule.priority = 0;
1201         rule.lookup = RT_TABLE_LOCAL;
1202         rv |= system_iprule(&rule, RTM_NEWRULE);
1203
1204         rule.priority = 32766;
1205         rule.lookup = RT_TABLE_MAIN;
1206         rv |= system_iprule(&rule, RTM_NEWRULE);
1207
1208         rule.priority = 32767;
1209         rule.lookup = RT_TABLE_DEFAULT;
1210         rv |= system_iprule(&rule, RTM_NEWRULE);
1211
1212
1213         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1214
1215         rule.priority = 0;
1216         rule.lookup = RT_TABLE_LOCAL;
1217         rv |= system_iprule(&rule, RTM_NEWRULE);
1218
1219         rule.priority = 32766;
1220         rule.lookup = RT_TABLE_MAIN;
1221         rv |= system_iprule(&rule, RTM_NEWRULE);
1222
1223         return rv;
1224 }
1225
1226 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1227 {
1228         char *e;
1229         unsigned int n;
1230
1231         if (!strcmp(action, "local"))
1232                 n = RTN_LOCAL;
1233         else if (!strcmp(action, "nat"))
1234                 n = RTN_NAT;
1235         else if (!strcmp(action, "broadcast"))
1236                 n = RTN_BROADCAST;
1237         else if (!strcmp(action, "anycast"))
1238                 n = RTN_ANYCAST;
1239         else if (!strcmp(action, "multicast"))
1240                 n = RTN_MULTICAST;
1241         else if (!strcmp(action, "prohibit"))
1242                 n = RTN_PROHIBIT;
1243         else if (!strcmp(action, "unreachable"))
1244                 n = RTN_UNREACHABLE;
1245         else if (!strcmp(action, "blackhole"))
1246                 n = RTN_BLACKHOLE;
1247         else if (!strcmp(action, "xresolve"))
1248                 n = RTN_XRESOLVE;
1249         else if (!strcmp(action, "unicast"))
1250                 n = RTN_UNICAST;
1251         else if (!strcmp(action, "throw"))
1252                 n = RTN_THROW;
1253         else {
1254                 n = strtoul(action, &e, 0);
1255                 if (!e || *e || e == action || n > 255)
1256                         return false;
1257         }
1258
1259         *id = n;
1260         return true;
1261 }
1262
1263 time_t system_get_rtime(void)
1264 {
1265         struct timespec ts;
1266         struct timeval tv;
1267
1268         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1269                 return ts.tv_sec;
1270
1271         if (gettimeofday(&tv, NULL) == 0)
1272                 return tv.tv_sec;
1273
1274         return 0;
1275 }
1276
1277 #ifndef IP_DF
1278 #define IP_DF       0x4000
1279 #endif
1280
1281 static void tunnel_parm_init(struct ip_tunnel_parm *p)
1282 {
1283         memset(p, 0, sizeof(*p));
1284         p->iph.version = 4;
1285         p->iph.ihl = 5;
1286         p->iph.frag_off = htons(IP_DF);
1287 }
1288
1289 static int tunnel_ioctl(const char *name, int cmd, void *p)
1290 {
1291         struct ifreq ifr;
1292
1293         memset(&ifr, 0, sizeof(ifr));
1294         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1295         ifr.ifr_ifru.ifru_data = p;
1296         return ioctl(sock_ioctl, cmd, &ifr);
1297 }
1298
1299 int system_del_ip_tunnel(const char *name)
1300 {
1301         struct ip_tunnel_parm p;
1302
1303         tunnel_parm_init(&p);
1304         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
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 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1335 {
1336         if (!attr)
1337                 return 1;
1338
1339         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
1340 }
1341
1342
1343 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1344 {
1345         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1346         struct blob_attr *cur;
1347         struct ip_tunnel_parm p;
1348         const char *base, *str;
1349         bool is_sit;
1350
1351         system_del_ip_tunnel(name);
1352
1353         tunnel_parm_init(&p);
1354
1355         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1356                 blob_data(attr), blob_len(attr));
1357
1358         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1359                 return -EINVAL;
1360         str = blobmsg_data(cur);
1361         is_sit = !strcmp(str, "sit");
1362
1363         if (is_sit) {
1364                 p.iph.protocol = IPPROTO_IPV6;
1365                 base = "sit0";
1366         } else
1367                 return -EINVAL;
1368
1369         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1370                 return -EINVAL;
1371
1372         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1373                 return -EINVAL;
1374
1375         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1376                 unsigned int val = blobmsg_get_u32(cur);
1377
1378                 if (val > 255)
1379                         return -EINVAL;
1380
1381                 p.iph.ttl = val;
1382         }
1383
1384         strncpy(p.name, name, sizeof(p.name));
1385         if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
1386                 return -1;
1387
1388 #ifdef SIOCADD6RD
1389         cur = tb[TUNNEL_ATTR_6RD_PREFIX];
1390         if (cur && is_sit) {
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
1415         return 0;
1416 }