system-linux.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  * Copyright (C) 2013 Steven Barth <steven@midlink.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2
   9  * as published by the Free Software Foundation
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16 #define _GNU_SOURCE
  17
  18 #include <sys/socket.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/stat.h>
  21 #include <sys/syscall.h>
  22
  23 #include <net/if.h>
  24 #include <net/if_arp.h>
  25
  26 #include <arpa/inet.h>
  27 #include <netinet/in.h>
  28
  29 #include <linux/rtnetlink.h>
  30 #include <linux/sockios.h>
  31 #include <linux/ip.h>
  32 #include <linux/if_vlan.h>
  33 #include <linux/if_bridge.h>
  34 #include <linux/if_tunnel.h>
  35 #include <linux/ip6_tunnel.h>
  36 #include <linux/ethtool.h>
  37 #include <linux/fib_rules.h>
  38
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <fcntl.h>
  42 #include <glob.h>
  43 #include <time.h>
  44
  45 #include <netlink/msg.h>
  46 #include <netlink/attr.h>
  47 #include <netlink/socket.h>
  48 #include <libubox/uloop.h>
  49
  50 #include "netifd.h"
  51 #include "device.h"
  52 #include "system.h"
  53
  54 struct event_socket {
  55         struct uloop_fd uloop;
  56         struct nl_sock *sock;
  57         struct nl_cb *cb;
  58 };
  59
  60 static int sock_ioctl = -1;
  61 static struct nl_sock *sock_rtnl = NULL;
  62
  63 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  64 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  65
  66 static char dev_buf[256];
  67
  68 static void
  69 handler_nl_event(struct uloop_fd *u, unsigned int events)
  70 {
  71         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  72         nl_recvmsgs(ev->sock, ev->cb);
  73 }
  74
  75 static struct nl_sock *
  76 create_socket(int protocol, int groups)
  77 {
  78         struct nl_sock *sock;
  79
  80         sock = nl_socket_alloc();
  81         if (!sock)
  82                 return NULL;
  83
  84         if (groups)
  85                 nl_join_groups(sock, groups);
  86
  87         if (nl_connect(sock, protocol))
  88                 return NULL;
  89
  90         return sock;
  91 }
  92
  93 static bool
  94 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
  95                         uloop_fd_handler cb)
  96 {
  97         ev->sock = create_socket(protocol, groups);
  98         if (!ev->sock)
  99                 return false;
 100
 101         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 102         ev->uloop.cb = cb;
 103         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
 104         return true;
 105 }
 106
 107 static bool
 108 create_event_socket(struct event_socket *ev, int protocol,
 109                     int (*cb)(struct nl_msg *msg, void *arg))
 110 {
 111         // Prepare socket for link events
 112         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
 113         if (!ev->cb)
 114                 return false;
 115
 116         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 117
 118         return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
 119 }
 120
 121 int system_init(void)
 122 {
 123         static struct event_socket rtnl_event;
 124         static struct event_socket hotplug_event;
 125
 126         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 127         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
 128
 129         // Prepare socket for routing / address control
 130         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 131         if (!sock_rtnl)
 132                 return -1;
 133
 134         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 135                 return -1;
 136
 137         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 138                                      handle_hotplug_event))
 139                 return -1;
 140
 141         // Receive network link events form kernel
 142         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 143
 144         return 0;
 145 }
 146
 147 static void system_set_sysctl(const char *path, const char *val)
 148 {
 149         int fd;
 150
 151         fd = open(path, O_WRONLY);
 152         if (fd < 0)
 153                 return;
 154
 155         write(fd, val, strlen(val));
 156         close(fd);
 157 }
 158
 159 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 160 {
 161         snprintf(dev_buf, sizeof(dev_buf), path, device);
 162         system_set_sysctl(dev_buf, val);
 163 }
 164
 165 static void system_set_disable_ipv6(struct device *dev, const char *val)
 166 {
 167         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 168 }
 169
 170 // Evaluate netlink messages
 171 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 172 {
 173         struct nlmsghdr *nh = nlmsg_hdr(msg);
 174         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 175         struct nlattr *nla[__IFLA_MAX];
 176
 177         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 178                 goto out;
 179
 180         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 181         if (!nla[IFLA_IFNAME])
 182                 goto out;
 183
 184         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 185         if (!dev)
 186                 goto out;
 187
 188         dev->ifindex = ifi->ifi_index;
 189         /* TODO: parse link status */
 190
 191 out:
 192         return 0;
 193 }
 194
 195 static void
 196 handle_hotplug_msg(char *data, int size)
 197 {
 198         const char *subsystem = NULL, *interface = NULL;
 199         char *cur, *end, *sep;
 200         struct device *dev;
 201         int skip;
 202         bool add;
 203
 204         if (!strncmp(data, "add@", 4))
 205                 add = true;
 206         else if (!strncmp(data, "remove@", 7))
 207                 add = false;
 208         else
 209                 return;
 210
 211         skip = strlen(data) + 1;
 212         end = data + size;
 213
 214         for (cur = data + skip; cur < end; cur += skip) {
 215                 skip = strlen(cur) + 1;
 216
 217                 sep = strchr(cur, '=');
 218                 if (!sep)
 219                         continue;
 220
 221                 *sep = 0;
 222                 if (!strcmp(cur, "INTERFACE"))
 223                         interface = sep + 1;
 224                 else if (!strcmp(cur, "SUBSYSTEM")) {
 225                         subsystem = sep + 1;
 226                         if (strcmp(subsystem, "net") != 0)
 227                                 return;
 228                 }
 229                 if (subsystem && interface)
 230                         goto found;
 231         }
 232         return;
 233
 234 found:
 235         dev = device_get(interface, false);
 236         if (!dev)
 237                 return;
 238
 239         if (dev->type != &simple_device_type)
 240                 return;
 241
 242         if (add && system_if_force_external(dev->ifname))
 243                 return;
 244
 245         device_set_present(dev, add);
 246 }
 247
 248 static void
 249 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 250 {
 251         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 252         struct sockaddr_nl nla;
 253         unsigned char *buf = NULL;
 254         int size;
 255
 256         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 257                 if (nla.nl_pid == 0)
 258                         handle_hotplug_msg((char *) buf, size);
 259
 260                 free(buf);
 261         }
 262 }
 263
 264 static int system_rtnl_call(struct nl_msg *msg)
 265 {
 266         int ret;
 267
 268         ret = nl_send_auto_complete(sock_rtnl, msg);
 269         nlmsg_free(msg);
 270
 271         if (ret < 0)
 272                 return ret;
 273
 274         return nl_wait_for_ack(sock_rtnl);
 275 }
 276
 277 int system_bridge_delbr(struct device *bridge)
 278 {
 279         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 280 }
 281
 282 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 283 {
 284         struct ifreq ifr;
 285
 286         memset(&ifr, 0, sizeof(ifr));
 287         if (dev)
 288                 ifr.ifr_ifindex = dev->ifindex;
 289         else
 290                 ifr.ifr_data = data;
 291         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 292         return ioctl(sock_ioctl, cmd, &ifr);
 293 }
 294
 295 static bool system_is_bridge(const char *name, char *buf, int buflen)
 296 {
 297         struct stat st;
 298
 299         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 300         if (stat(buf, &st) < 0)
 301                 return false;
 302
 303         return true;
 304 }
 305
 306 static char *system_get_bridge(const char *name, char *buf, int buflen)
 307 {
 308         char *path;
 309         ssize_t len;
 310         glob_t gl;
 311
 312         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 313         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 314                 return NULL;
 315
 316         if (gl.gl_pathc == 0)
 317                 return NULL;
 318
 319         len = readlink(gl.gl_pathv[0], buf, buflen);
 320         if (len < 0)
 321                 return NULL;
 322
 323         buf[len] = 0;
 324         path = strrchr(buf, '/');
 325         if (!path)
 326                 return NULL;
 327
 328         return path + 1;
 329 }
 330
 331 int system_bridge_addif(struct device *bridge, struct device *dev)
 332 {
 333         char *oldbr;
 334
 335         system_set_disable_ipv6(dev, "1");
 336         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 337         if (oldbr && !strcmp(oldbr, bridge->ifname))
 338                 return 0;
 339
 340         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 341 }
 342
 343 int system_bridge_delif(struct device *bridge, struct device *dev)
 344 {
 345         system_set_disable_ipv6(dev, "0");
 346         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 347 }
 348
 349 static int system_if_resolve(struct device *dev)
 350 {
 351         struct ifreq ifr;
 352         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 353         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 354                 return ifr.ifr_ifindex;
 355         else
 356                 return 0;
 357 }
 358
 359 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 360 {
 361         struct ifreq ifr;
 362
 363         memset(&ifr, 0, sizeof(ifr));
 364         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 365         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 366         ifr.ifr_flags |= add;
 367         ifr.ifr_flags &= ~rem;
 368         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 369 }
 370
 371 struct clear_data {
 372         struct nl_msg *msg;
 373         struct device *dev;
 374         int type;
 375         int size;
 376         int af;
 377 };
 378
 379
 380 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 381 {
 382         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 383
 384         return ifa->ifa_index == ifindex;
 385 }
 386
 387 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 388 {
 389         struct rtmsg *r = NLMSG_DATA(hdr);
 390         struct nlattr *tb[__RTA_MAX];
 391
 392         if (r->rtm_protocol == RTPROT_KERNEL &&
 393             r->rtm_family == AF_INET6)
 394                 return false;
 395
 396         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 397         if (!tb[RTA_OIF])
 398                 return false;
 399
 400         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 401 }
 402
 403 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 404 {
 405         return true;
 406 }
 407
 408 static int cb_clear_event(struct nl_msg *msg, void *arg)
 409 {
 410         struct clear_data *clr = arg;
 411         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 412         bool (*cb)(struct nlmsghdr *, int ifindex);
 413         int type;
 414
 415         switch(clr->type) {
 416         case RTM_GETADDR:
 417                 type = RTM_DELADDR;
 418                 if (hdr->nlmsg_type != RTM_NEWADDR)
 419                         return NL_SKIP;
 420
 421                 cb = check_ifaddr;
 422                 break;
 423         case RTM_GETROUTE:
 424                 type = RTM_DELROUTE;
 425                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 426                         return NL_SKIP;
 427
 428                 cb = check_route;
 429                 break;
 430         case RTM_GETRULE:
 431                 type = RTM_DELRULE;
 432                 if (hdr->nlmsg_type != RTM_NEWRULE)
 433                         return NL_SKIP;
 434
 435                 cb = check_rule;
 436                 break;
 437         default:
 438                 return NL_SKIP;
 439         }
 440
 441         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 442                 return NL_SKIP;
 443
 444         if (type == RTM_DELRULE)
 445                 D(SYSTEM, "Remove a rule\n");
 446         else
 447                 D(SYSTEM, "Remove %s from device %s\n",
 448                   type == RTM_DELADDR ? "an address" : "a route",
 449                   clr->dev->ifname);
 450         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 451         hdr = nlmsg_hdr(clr->msg);
 452         hdr->nlmsg_type = type;
 453         hdr->nlmsg_flags = NLM_F_REQUEST;
 454
 455         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 456                 nl_wait_for_ack(sock_rtnl);
 457
 458         return NL_SKIP;
 459 }
 460
 461 static int
 462 cb_finish_event(struct nl_msg *msg, void *arg)
 463 {
 464         int *pending = arg;
 465         *pending = 0;
 466         return NL_STOP;
 467 }
 468
 469 static int
 470 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 471 {
 472         int *pending = arg;
 473         *pending = err->error;
 474         return NL_STOP;
 475 }
 476
 477 static void
 478 system_if_clear_entries(struct device *dev, int type, int af)
 479 {
 480         struct clear_data clr;
 481         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 482         struct rtmsg rtm = {
 483                 .rtm_family = af,
 484                 .rtm_flags = RTM_F_CLONED,
 485         };
 486         int flags = NLM_F_DUMP;
 487         int pending = 1;
 488
 489         clr.af = af;
 490         clr.dev = dev;
 491         clr.type = type;
 492         switch (type) {
 493         case RTM_GETADDR:
 494         case RTM_GETRULE:
 495                 clr.size = sizeof(struct rtgenmsg);
 496                 break;
 497         case RTM_GETROUTE:
 498                 clr.size = sizeof(struct rtmsg);
 499                 break;
 500         default:
 501                 return;
 502         }
 503
 504         if (!cb)
 505                 return;
 506
 507         clr.msg = nlmsg_alloc_simple(type, flags);
 508         if (!clr.msg)
 509                 goto out;
 510
 511         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 512         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 513         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 514         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 515
 516         nl_send_auto_complete(sock_rtnl, clr.msg);
 517         while (pending > 0)
 518                 nl_recvmsgs(sock_rtnl, cb);
 519
 520         nlmsg_free(clr.msg);
 521 out:
 522         nl_cb_put(cb);
 523 }
 524
 525 /*
 526  * Clear bridge (membership) state and bring down device
 527  */
 528 void system_if_clear_state(struct device *dev)
 529 {
 530         static char buf[256];
 531         char *bridge;
 532
 533         if (dev->external)
 534                 return;
 535
 536         dev->ifindex = system_if_resolve(dev);
 537         if (!dev->ifindex)
 538                 return;
 539
 540         system_if_flags(dev->ifname, 0, IFF_UP);
 541
 542         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 543                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 544                 system_bridge_delbr(dev);
 545                 return;
 546         }
 547
 548         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 549         if (bridge) {
 550                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 551                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 552         }
 553
 554         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 555         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 556         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 557         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 558         system_set_disable_ipv6(dev, "0");
 559 }
 560
 561 static inline unsigned long
 562 sec_to_jiffies(int val)
 563 {
 564         return (unsigned long) val * 100;
 565 }
 566
 567 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 568 {
 569         unsigned long args[4] = {};
 570
 571         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 572                 return -1;
 573
 574         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 575         args[1] = !!cfg->stp;
 576         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 577
 578         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 579         args[1] = sec_to_jiffies(cfg->forward_delay);
 580         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 581
 582         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 583                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 584
 585         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 586         args[1] = cfg->priority;
 587         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 588
 589         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 590                 args[0] = BRCTL_SET_AGEING_TIME;
 591                 args[1] = sec_to_jiffies(cfg->ageing_time);
 592                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 593         }
 594
 595         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 596                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 597                 args[1] = sec_to_jiffies(cfg->hello_time);
 598                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 599         }
 600
 601         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 602                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 603                 args[1] = sec_to_jiffies(cfg->max_age);
 604                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int system_vlan(struct device *dev, int id)
 611 {
 612         struct vlan_ioctl_args ifr = {
 613                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 614                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 615         };
 616
 617         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 618
 619         if (id < 0) {
 620                 ifr.cmd = DEL_VLAN_CMD;
 621                 ifr.u.VID = 0;
 622         } else {
 623                 ifr.cmd = ADD_VLAN_CMD;
 624                 ifr.u.VID = id;
 625         }
 626         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 627         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 628 }
 629
 630 int system_vlan_add(struct device *dev, int id)
 631 {
 632         return system_vlan(dev, id);
 633 }
 634
 635 int system_vlan_del(struct device *dev)
 636 {
 637         return system_vlan(dev, -1);
 638 }
 639
 640 static void
 641 system_if_get_settings(struct device *dev, struct device_settings *s)
 642 {
 643         struct ifreq ifr;
 644
 645         memset(&ifr, 0, sizeof(ifr));
 646         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 647
 648         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 649                 s->mtu = ifr.ifr_mtu;
 650                 s->flags |= DEV_OPT_MTU;
 651         }
 652
 653         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 654                 s->txqueuelen = ifr.ifr_qlen;
 655                 s->flags |= DEV_OPT_TXQUEUELEN;
 656         }
 657
 658         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 659                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 660                 s->flags |= DEV_OPT_MACADDR;
 661         }
 662 }
 663
 664 void
 665 system_if_apply_settings(struct device *dev, struct device_settings *s)
 666 {
 667         struct ifreq ifr;
 668
 669         memset(&ifr, 0, sizeof(ifr));
 670         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 671         if (s->flags & DEV_OPT_MTU) {
 672                 ifr.ifr_mtu = s->mtu;
 673                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 674                         s->flags &= ~DEV_OPT_MTU;
 675         }
 676         if (s->flags & DEV_OPT_TXQUEUELEN) {
 677                 ifr.ifr_qlen = s->txqueuelen;
 678                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 679                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 680         }
 681         if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
 682                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 683                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 684                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 685                         s->flags &= ~DEV_OPT_MACADDR;
 686         }
 687 }
 688
 689 int system_if_up(struct device *dev)
 690 {
 691         system_if_get_settings(dev, &dev->orig_settings);
 692         system_if_apply_settings(dev, &dev->settings);
 693         dev->ifindex = system_if_resolve(dev);
 694         return system_if_flags(dev->ifname, IFF_UP, 0);
 695 }
 696
 697 int system_if_down(struct device *dev)
 698 {
 699         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 700         dev->orig_settings.flags &= dev->settings.flags;
 701         system_if_apply_settings(dev, &dev->orig_settings);
 702         return ret;
 703 }
 704
 705 int system_if_check(struct device *dev)
 706 {
 707         device_set_present(dev, (system_if_resolve(dev) > 0));
 708         return 0;
 709 }
 710
 711 struct device *
 712 system_if_get_parent(struct device *dev)
 713 {
 714         char buf[64], *devname;
 715         int ifindex, iflink, len;
 716         FILE *f;
 717
 718         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 719         f = fopen(buf, "r");
 720         if (!f)
 721                 return NULL;
 722
 723         len = fread(buf, 1, sizeof(buf) - 1, f);
 724         fclose(f);
 725
 726         if (len <= 0)
 727                 return NULL;
 728
 729         buf[len] = 0;
 730         iflink = strtoul(buf, NULL, 0);
 731         ifindex = system_if_resolve(dev);
 732         if (!iflink || iflink == ifindex)
 733                 return NULL;
 734
 735         devname = if_indextoname(iflink, buf);
 736         if (!devname)
 737                 return NULL;
 738
 739         return device_get(devname, true);
 740 }
 741
 742 static bool
 743 read_string_file(int dir_fd, const char *file, char *buf, int len)
 744 {
 745         bool ret = false;
 746         char *c;
 747         int fd;
 748
 749         fd = openat(dir_fd, file, O_RDONLY);
 750         if (fd < 0)
 751                 return false;
 752
 753 retry:
 754         len = read(fd, buf, len - 1);
 755         if (len < 0) {
 756                 if (errno == EINTR)
 757                         goto retry;
 758         } else if (len > 0) {
 759                         buf[len] = 0;
 760
 761                         c = strchr(buf, '\n');
 762                         if (c)
 763                                 *c = 0;
 764
 765                         ret = true;
 766         }
 767
 768         close(fd);
 769
 770         return ret;
 771 }
 772
 773 static bool
 774 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
 775 {
 776         char buf[64];
 777         bool ret = false;
 778
 779         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 780         if (ret)
 781                 *val = strtoull(buf, NULL, 0);
 782
 783         return ret;
 784 }
 785
 786 /* Assume advertised flags == supported flags */
 787 static const struct {
 788         uint32_t mask;
 789         const char *name;
 790 } ethtool_link_modes[] = {
 791         { ADVERTISED_10baseT_Half, "10H" },
 792         { ADVERTISED_10baseT_Full, "10F" },
 793         { ADVERTISED_100baseT_Half, "100H" },
 794         { ADVERTISED_100baseT_Full, "100F" },
 795         { ADVERTISED_1000baseT_Half, "1000H" },
 796         { ADVERTISED_1000baseT_Full, "1000F" },
 797 };
 798
 799 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 800 {
 801         int i;
 802         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 803                 if (mask & ethtool_link_modes[i].mask)
 804                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 805         }
 806 }
 807
 808 bool
 809 system_if_force_external(const char *ifname)
 810 {
 811         char buf[64];
 812         struct stat s;
 813
 814         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 815         return stat(buf, &s) == 0;
 816 }
 817
 818 int
 819 system_if_dump_info(struct device *dev, struct blob_buf *b)
 820 {
 821         struct ethtool_cmd ecmd;
 822         struct ifreq ifr;
 823         char buf[64], *s;
 824         void *c;
 825         int dir_fd;
 826         uint64_t val = 0;
 827
 828         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 829         dir_fd = open(buf, O_DIRECTORY);
 830
 831         if (read_uint64_file(dir_fd, "carrier", &val))
 832                 blobmsg_add_u8(b, "link", !!val);
 833
 834         memset(&ecmd, 0, sizeof(ecmd));
 835         memset(&ifr, 0, sizeof(ifr));
 836         strcpy(ifr.ifr_name, dev->ifname);
 837         ifr.ifr_data = (caddr_t) &ecmd;
 838         ecmd.cmd = ETHTOOL_GSET;
 839
 840         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 841                 c = blobmsg_open_array(b, "link-advertising");
 842                 system_add_link_modes(b, ecmd.advertising);
 843                 blobmsg_close_array(b, c);
 844
 845                 c = blobmsg_open_array(b, "link-supported");
 846                 system_add_link_modes(b, ecmd.supported);
 847                 blobmsg_close_array(b, c);
 848
 849                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 850                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 851                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 852                 blobmsg_add_string_buffer(b);
 853         }
 854
 855         close(dir_fd);
 856         return 0;
 857 }
 858
 859 int
 860 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 861 {
 862         const char *const counters[] = {
 863                 "collisions",     "rx_frame_errors",   "tx_compressed",
 864                 "multicast",      "rx_length_errors",  "tx_dropped",
 865                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 866                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 867                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 868                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 869                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 870                 "rx_fifo_errors", "tx_carrier_errors",
 871         };
 872         char buf[64];
 873         int stats_dir;
 874         int i;
 875         uint64_t val = 0;
 876
 877         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 878         stats_dir = open(buf, O_DIRECTORY);
 879         if (stats_dir < 0)
 880                 return -1;
 881
 882         for (i = 0; i < ARRAY_SIZE(counters); i++)
 883                 if (read_uint64_file(stats_dir, counters[i], &val))
 884                         blobmsg_add_u64(b, counters[i], val);
 885
 886         close(stats_dir);
 887         return 0;
 888 }
 889
 890 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 891 {
 892         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 893         int alen = v4 ? 4 : 16;
 894         unsigned int flags = 0;
 895         struct ifaddrmsg ifa = {
 896                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 897                 .ifa_prefixlen = addr->mask,
 898                 .ifa_index = dev->ifindex,
 899         };
 900
 901         struct nl_msg *msg;
 902         if (cmd == RTM_NEWADDR)
 903                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 904
 905         msg = nlmsg_alloc_simple(cmd, flags);
 906         if (!msg)
 907                 return -1;
 908
 909         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 910         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 911         if (v4) {
 912                 if (addr->broadcast)
 913                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 914                 if (addr->point_to_point)
 915                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 916         } else {
 917                 time_t now = system_get_rtime();
 918                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
 919
 920                 if (addr->preferred_until) {
 921                         int preferred = addr->preferred_until - now;
 922                         if (preferred < 0)
 923                                 preferred = 0;
 924
 925                         cinfo.ifa_prefered = preferred;
 926                 }
 927
 928                 if (addr->valid_until) {
 929                         int valid = addr->valid_until - now;
 930                         if (valid <= 0)
 931                                 return -1;
 932
 933                         cinfo.ifa_valid = valid;
 934                 }
 935
 936                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
 937         }
 938
 939         return system_rtnl_call(msg);
 940 }
 941
 942 int system_add_address(struct device *dev, struct device_addr *addr)
 943 {
 944         return system_addr(dev, addr, RTM_NEWADDR);
 945 }
 946
 947 int system_del_address(struct device *dev, struct device_addr *addr)
 948 {
 949         return system_addr(dev, addr, RTM_DELADDR);
 950 }
 951
 952 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 953 {
 954         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 955         bool have_gw;
 956         unsigned int flags = 0;
 957
 958         if (alen == 4)
 959                 have_gw = !!route->nexthop.in.s_addr;
 960         else
 961                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 962                         route->nexthop.in6.s6_addr32[1] ||
 963                         route->nexthop.in6.s6_addr32[2] ||
 964                         route->nexthop.in6.s6_addr32[3];
 965
 966         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 967                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 968
 969         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
 970                         ? route->table : RT_TABLE_MAIN;
 971
 972         struct rtmsg rtm = {
 973                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 974                 .rtm_dst_len = route->mask,
 975                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
 976                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
 977                 .rtm_scope = scope,
 978                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 979         };
 980         struct nl_msg *msg;
 981
 982         if (cmd == RTM_NEWROUTE) {
 983                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 984
 985                 if (!dev) { // Add null-route
 986                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
 987                         rtm.rtm_type = RTN_UNREACHABLE;
 988                 }
 989         }
 990
 991         msg = nlmsg_alloc_simple(cmd, flags);
 992         if (!msg)
 993                 return -1;
 994
 995         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 996
 997         if (route->mask)
 998                 nla_put(msg, RTA_DST, alen, &route->addr);
 999
1000         if (route->metric > 0)
1001                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1002
1003         if (have_gw)
1004                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1005
1006         if (dev)
1007                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1008
1009         if (table >= 256)
1010                 nla_put_u32(msg, RTA_TABLE, table);
1011
1012         return system_rtnl_call(msg);
1013 }
1014
1015 int system_add_route(struct device *dev, struct device_route *route)
1016 {
1017         return system_rt(dev, route, RTM_NEWROUTE);
1018 }
1019
1020 int system_del_route(struct device *dev, struct device_route *route)
1021 {
1022         return system_rt(dev, route, RTM_DELROUTE);
1023 }
1024
1025 int system_flush_routes(void)
1026 {
1027         const char *names[] = {
1028                 "/proc/sys/net/ipv4/route/flush",
1029                 "/proc/sys/net/ipv6/route/flush"
1030         };
1031         int fd, i;
1032
1033         for (i = 0; i < ARRAY_SIZE(names); i++) {
1034                 fd = open(names[i], O_WRONLY);
1035                 if (fd < 0)
1036                         continue;
1037
1038                 write(fd, "-1", 2);
1039                 close(fd);
1040         }
1041         return 0;
1042 }
1043
1044 bool system_resolve_rt_table(const char *name, unsigned int *id)
1045 {
1046         FILE *f;
1047         char *e, buf[128];
1048         unsigned int n, table = RT_TABLE_UNSPEC;
1049
1050         /* first try to parse table as number */
1051         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1052                 table = n;
1053
1054         /* handle well known aliases */
1055         else if (!strcmp(name, "default"))
1056                 table = RT_TABLE_DEFAULT;
1057         else if (!strcmp(name, "main"))
1058                 table = RT_TABLE_MAIN;
1059         else if (!strcmp(name, "local"))
1060                 table = RT_TABLE_LOCAL;
1061
1062         /* try to look up name in /etc/iproute2/rt_tables */
1063         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1064         {
1065                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1066                 {
1067                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1068                                 continue;
1069
1070                         n = strtoul(e, NULL, 10);
1071                         e = strtok(NULL, " \t\n");
1072
1073                         if (e && !strcmp(e, name))
1074                         {
1075                                 table = n;
1076                                 break;
1077                         }
1078                 }
1079
1080                 fclose(f);
1081         }
1082
1083         if (table == RT_TABLE_UNSPEC)
1084                 return false;
1085
1086         /* do not consider main table special */
1087         if (table == RT_TABLE_MAIN)
1088                 table = RT_TABLE_UNSPEC;
1089
1090         *id = table;
1091         return true;
1092 }
1093
1094 static int system_iprule(struct iprule *rule, int cmd)
1095 {
1096         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1097
1098         struct nl_msg *msg;
1099         struct rtmsg rtm = {
1100                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1101                 .rtm_protocol = RTPROT_STATIC,
1102                 .rtm_scope = RT_SCOPE_UNIVERSE,
1103                 .rtm_table = RT_TABLE_UNSPEC,
1104                 .rtm_type = RTN_UNSPEC,
1105                 .rtm_flags = 0,
1106         };
1107
1108         if (cmd == RTM_NEWRULE) {
1109                 rtm.rtm_type = RTN_UNICAST;
1110                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1111         }
1112
1113         if (rule->invert)
1114                 rtm.rtm_flags |= FIB_RULE_INVERT;
1115
1116         if (rule->flags & IPRULE_SRC)
1117                 rtm.rtm_src_len = rule->src_mask;
1118
1119         if (rule->flags & IPRULE_DEST)
1120                 rtm.rtm_dst_len = rule->dest_mask;
1121
1122         if (rule->flags & IPRULE_TOS)
1123                 rtm.rtm_tos = rule->tos;
1124
1125         if (rule->flags & IPRULE_LOOKUP) {
1126                 if (rule->lookup < 256)
1127                         rtm.rtm_table = rule->lookup;
1128         }
1129
1130         if (rule->flags & IPRULE_ACTION)
1131                 rtm.rtm_type = rule->action;
1132         else if (rule->flags & IPRULE_GOTO)
1133                 rtm.rtm_type = FR_ACT_GOTO;
1134         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1135                 rtm.rtm_type = FR_ACT_NOP;
1136
1137         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1138
1139         if (!msg)
1140                 return -1;
1141
1142         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1143
1144         if (rule->flags & IPRULE_IN)
1145                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1146
1147         if (rule->flags & IPRULE_OUT)
1148                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1149
1150         if (rule->flags & IPRULE_SRC)
1151                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1152
1153         if (rule->flags & IPRULE_DEST)
1154                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1155
1156         if (rule->flags & IPRULE_PRIORITY)
1157                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1158         else if (cmd == RTM_NEWRULE)
1159                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1160
1161         if (rule->flags & IPRULE_FWMARK)
1162                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1163
1164         if (rule->flags & IPRULE_FWMASK)
1165                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1166
1167         if (rule->flags & IPRULE_LOOKUP) {
1168                 if (rule->lookup >= 256)
1169                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1170         }
1171
1172         if (rule->flags & IPRULE_GOTO)
1173                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1174
1175         return system_rtnl_call(msg);
1176 }
1177
1178 int system_add_iprule(struct iprule *rule)
1179 {
1180         return system_iprule(rule, RTM_NEWRULE);
1181 }
1182
1183 int system_del_iprule(struct iprule *rule)
1184 {
1185         return system_iprule(rule, RTM_DELRULE);
1186 }
1187
1188 int system_flush_iprules(void)
1189 {
1190         int rv = 0;
1191         struct iprule rule;
1192
1193         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1194         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1195
1196         memset(&rule, 0, sizeof(rule));
1197
1198
1199         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1200
1201         rule.priority = 0;
1202         rule.lookup = RT_TABLE_LOCAL;
1203         rv |= system_iprule(&rule, RTM_NEWRULE);
1204
1205         rule.priority = 32766;
1206         rule.lookup = RT_TABLE_MAIN;
1207         rv |= system_iprule(&rule, RTM_NEWRULE);
1208
1209         rule.priority = 32767;
1210         rule.lookup = RT_TABLE_DEFAULT;
1211         rv |= system_iprule(&rule, RTM_NEWRULE);
1212
1213
1214         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1215
1216         rule.priority = 0;
1217         rule.lookup = RT_TABLE_LOCAL;
1218         rv |= system_iprule(&rule, RTM_NEWRULE);
1219
1220         rule.priority = 32766;
1221         rule.lookup = RT_TABLE_MAIN;
1222         rv |= system_iprule(&rule, RTM_NEWRULE);
1223
1224         return rv;
1225 }
1226
1227 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1228 {
1229         char *e;
1230         unsigned int n;
1231
1232         if (!strcmp(action, "local"))
1233                 n = RTN_LOCAL;
1234         else if (!strcmp(action, "nat"))
1235                 n = RTN_NAT;
1236         else if (!strcmp(action, "broadcast"))
1237                 n = RTN_BROADCAST;
1238         else if (!strcmp(action, "anycast"))
1239                 n = RTN_ANYCAST;
1240         else if (!strcmp(action, "multicast"))
1241                 n = RTN_MULTICAST;
1242         else if (!strcmp(action, "prohibit"))
1243                 n = RTN_PROHIBIT;
1244         else if (!strcmp(action, "unreachable"))
1245                 n = RTN_UNREACHABLE;
1246         else if (!strcmp(action, "blackhole"))
1247                 n = RTN_BLACKHOLE;
1248         else if (!strcmp(action, "xresolve"))
1249                 n = RTN_XRESOLVE;
1250         else if (!strcmp(action, "unicast"))
1251                 n = RTN_UNICAST;
1252         else if (!strcmp(action, "throw"))
1253                 n = RTN_THROW;
1254         else {
1255                 n = strtoul(action, &e, 0);
1256                 if (!e || *e || e == action || n > 255)
1257                         return false;
1258         }
1259
1260         *id = n;
1261         return true;
1262 }
1263
1264 time_t system_get_rtime(void)
1265 {
1266         struct timespec ts;
1267         struct timeval tv;
1268
1269         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1270                 return ts.tv_sec;
1271
1272         if (gettimeofday(&tv, NULL) == 0)
1273                 return tv.tv_sec;
1274
1275         return 0;
1276 }
1277
1278 #ifndef IP_DF
1279 #define IP_DF       0x4000
1280 #endif
1281
1282 static int tunnel_ioctl(const char *name, int cmd, void *p)
1283 {
1284         struct ifreq ifr;
1285
1286         memset(&ifr, 0, sizeof(ifr));
1287         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1288         ifr.ifr_ifru.ifru_data = p;
1289         return ioctl(sock_ioctl, cmd, &ifr);
1290 }
1291
1292 int system_del_ip_tunnel(const char *name)
1293 {
1294         return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1295 }
1296
1297 int system_update_ipv6_mtu(struct device *dev, int mtu)
1298 {
1299         int ret = -1;
1300         char buf[64];
1301         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1302                         dev->ifname);
1303
1304         int fd = open(buf, O_RDWR);
1305         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1306         if (len < 0)
1307                 goto out;
1308
1309         buf[len] = 0;
1310         ret = atoi(buf);
1311
1312         if (!mtu || ret <= mtu)
1313                 goto out;
1314
1315         lseek(fd, 0, SEEK_SET);
1316         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1317                 ret = -1;
1318
1319 out:
1320         close(fd);
1321         return ret;
1322 }
1323
1324
1325 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1326 {
1327         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1328         struct blob_attr *cur;
1329         const char *str;
1330
1331         system_del_ip_tunnel(name);
1332
1333         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1334                 blob_data(attr), blob_len(attr));
1335
1336         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1337                 return -EINVAL;
1338         str = blobmsg_data(cur);
1339
1340         unsigned int ttl = 0;
1341         if ((cur = tb[TUNNEL_ATTR_TTL]) && (ttl = blobmsg_get_u32(cur)) > 255)
1342                 return -EINVAL;
1343
1344         unsigned int link = 0;
1345         if ((cur = tb[TUNNEL_ATTR_LINK]) &&
1346                         !(link = if_nametoindex((const char*)blobmsg_data(cur))))
1347                 return -EINVAL;
1348
1349
1350         if (!strcmp(str, "sit")) {
1351                 struct ip_tunnel_parm p = {
1352                         .link = link,
1353                         .iph = {
1354                                 .version = 4,
1355                                 .ihl = 5,
1356                                 .frag_off = htons(IP_DF),
1357                                 .protocol = IPPROTO_IPV6,
1358                                 .ttl = ttl
1359                         }
1360                 };
1361
1362                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1363                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1364                         return -EINVAL;
1365
1366                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1367                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1368                         return -EINVAL;
1369
1370                 strncpy(p.name, name, sizeof(p.name));
1371                 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1372                         return -1;
1373
1374 #ifdef SIOCADD6RD
1375                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1376                         unsigned int mask;
1377                         struct ip_tunnel_6rd p6;
1378
1379                         memset(&p6, 0, sizeof(p6));
1380
1381                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1382                                                 &p6.prefix, &mask) || mask > 128)
1383                                 return -EINVAL;
1384                         p6.prefixlen = mask;
1385
1386                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1387                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1388                                                         &p6.relay_prefix, &mask) || mask > 32)
1389                                         return -EINVAL;
1390                                 p6.relay_prefixlen = mask;
1391                         }
1392
1393                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1394                                 system_del_ip_tunnel(name);
1395                                 return -1;
1396                         }
1397                 }
1398 #endif
1399         } else if (!strcmp(str, "ipip6")) {
1400                 struct ip6_tnl_parm p = {
1401                         .link = link,
1402                         .proto = IPPROTO_IPIP,
1403                         .hop_limit = (ttl) ? ttl : 64,
1404                         .encap_limit = 4,
1405                 };
1406
1407                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1408                                 inet_pton(AF_INET6, blobmsg_data(cur), &p.laddr) < 1)
1409                         return -EINVAL;
1410
1411                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1412                                 inet_pton(AF_INET6, blobmsg_data(cur), &p.raddr) < 1)
1413                         return -EINVAL;
1414
1415                 strncpy(p.name, name, sizeof(p.name));
1416                 if (tunnel_ioctl("ip6tnl0", SIOCADDTUNNEL, &p) < 0)
1417                         return -1;
1418         } else
1419                 return -EINVAL;
1420
1421         return 0;
1422 }