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         if (cfg->flags & BRIDGE_OPT_PRIORITY) {
 585                 args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 586                 args[1] = cfg->priority;
 587                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 588         }
 589
 590         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 591                 args[0] = BRCTL_SET_AGEING_TIME;
 592                 args[1] = sec_to_jiffies(cfg->ageing_time);
 593                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 594         }
 595
 596         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 597                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 598                 args[1] = sec_to_jiffies(cfg->hello_time);
 599                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 600         }
 601
 602         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 603                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 604                 args[1] = sec_to_jiffies(cfg->max_age);
 605                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 606         }
 607
 608         return 0;
 609 }
 610
 611 static int system_vlan(struct device *dev, int id)
 612 {
 613         struct vlan_ioctl_args ifr = {
 614                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 615                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 616         };
 617
 618         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 619
 620         if (id < 0) {
 621                 ifr.cmd = DEL_VLAN_CMD;
 622                 ifr.u.VID = 0;
 623         } else {
 624                 ifr.cmd = ADD_VLAN_CMD;
 625                 ifr.u.VID = id;
 626         }
 627         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 628         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 629 }
 630
 631 int system_vlan_add(struct device *dev, int id)
 632 {
 633         return system_vlan(dev, id);
 634 }
 635
 636 int system_vlan_del(struct device *dev)
 637 {
 638         return system_vlan(dev, -1);
 639 }
 640
 641 static void
 642 system_if_get_settings(struct device *dev, struct device_settings *s)
 643 {
 644         struct ifreq ifr;
 645
 646         memset(&ifr, 0, sizeof(ifr));
 647         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 648
 649         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 650                 s->mtu = ifr.ifr_mtu;
 651                 s->flags |= DEV_OPT_MTU;
 652         }
 653
 654         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 655                 s->txqueuelen = ifr.ifr_qlen;
 656                 s->flags |= DEV_OPT_TXQUEUELEN;
 657         }
 658
 659         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 660                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 661                 s->flags |= DEV_OPT_MACADDR;
 662         }
 663 }
 664
 665 void
 666 system_if_apply_settings(struct device *dev, struct device_settings *s)
 667 {
 668         struct ifreq ifr;
 669
 670         memset(&ifr, 0, sizeof(ifr));
 671         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 672         if (s->flags & DEV_OPT_MTU) {
 673                 ifr.ifr_mtu = s->mtu;
 674                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 675                         s->flags &= ~DEV_OPT_MTU;
 676         }
 677         if (s->flags & DEV_OPT_TXQUEUELEN) {
 678                 ifr.ifr_qlen = s->txqueuelen;
 679                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 680                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 681         }
 682         if ((s->flags & DEV_OPT_MACADDR) && !dev->external) {
 683                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 684                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 685                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 686                         s->flags &= ~DEV_OPT_MACADDR;
 687         }
 688 }
 689
 690 int system_if_up(struct device *dev)
 691 {
 692         system_if_get_settings(dev, &dev->orig_settings);
 693         system_if_apply_settings(dev, &dev->settings);
 694         dev->ifindex = system_if_resolve(dev);
 695         return system_if_flags(dev->ifname, IFF_UP, 0);
 696 }
 697
 698 int system_if_down(struct device *dev)
 699 {
 700         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 701         dev->orig_settings.flags &= dev->settings.flags;
 702         system_if_apply_settings(dev, &dev->orig_settings);
 703         return ret;
 704 }
 705
 706 int system_if_check(struct device *dev)
 707 {
 708         device_set_present(dev, (system_if_resolve(dev) > 0));
 709         return 0;
 710 }
 711
 712 struct device *
 713 system_if_get_parent(struct device *dev)
 714 {
 715         char buf[64], *devname;
 716         int ifindex, iflink, len;
 717         FILE *f;
 718
 719         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 720         f = fopen(buf, "r");
 721         if (!f)
 722                 return NULL;
 723
 724         len = fread(buf, 1, sizeof(buf) - 1, f);
 725         fclose(f);
 726
 727         if (len <= 0)
 728                 return NULL;
 729
 730         buf[len] = 0;
 731         iflink = strtoul(buf, NULL, 0);
 732         ifindex = system_if_resolve(dev);
 733         if (!iflink || iflink == ifindex)
 734                 return NULL;
 735
 736         devname = if_indextoname(iflink, buf);
 737         if (!devname)
 738                 return NULL;
 739
 740         return device_get(devname, true);
 741 }
 742
 743 static bool
 744 read_string_file(int dir_fd, const char *file, char *buf, int len)
 745 {
 746         bool ret = false;
 747         char *c;
 748         int fd;
 749
 750         fd = openat(dir_fd, file, O_RDONLY);
 751         if (fd < 0)
 752                 return false;
 753
 754 retry:
 755         len = read(fd, buf, len - 1);
 756         if (len < 0) {
 757                 if (errno == EINTR)
 758                         goto retry;
 759         } else if (len > 0) {
 760                         buf[len] = 0;
 761
 762                         c = strchr(buf, '\n');
 763                         if (c)
 764                                 *c = 0;
 765
 766                         ret = true;
 767         }
 768
 769         close(fd);
 770
 771         return ret;
 772 }
 773
 774 static bool
 775 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
 776 {
 777         char buf[64];
 778         bool ret = false;
 779
 780         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 781         if (ret)
 782                 *val = strtoull(buf, NULL, 0);
 783
 784         return ret;
 785 }
 786
 787 /* Assume advertised flags == supported flags */
 788 static const struct {
 789         uint32_t mask;
 790         const char *name;
 791 } ethtool_link_modes[] = {
 792         { ADVERTISED_10baseT_Half, "10H" },
 793         { ADVERTISED_10baseT_Full, "10F" },
 794         { ADVERTISED_100baseT_Half, "100H" },
 795         { ADVERTISED_100baseT_Full, "100F" },
 796         { ADVERTISED_1000baseT_Half, "1000H" },
 797         { ADVERTISED_1000baseT_Full, "1000F" },
 798 };
 799
 800 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 801 {
 802         int i;
 803         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 804                 if (mask & ethtool_link_modes[i].mask)
 805                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 806         }
 807 }
 808
 809 bool
 810 system_if_force_external(const char *ifname)
 811 {
 812         char buf[64];
 813         struct stat s;
 814
 815         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 816         return stat(buf, &s) == 0;
 817 }
 818
 819 int
 820 system_if_dump_info(struct device *dev, struct blob_buf *b)
 821 {
 822         struct ethtool_cmd ecmd;
 823         struct ifreq ifr;
 824         char buf[64], *s;
 825         void *c;
 826         int dir_fd;
 827         uint64_t val = 0;
 828
 829         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 830         dir_fd = open(buf, O_DIRECTORY);
 831
 832         if (read_uint64_file(dir_fd, "carrier", &val))
 833                 blobmsg_add_u8(b, "link", !!val);
 834
 835         memset(&ecmd, 0, sizeof(ecmd));
 836         memset(&ifr, 0, sizeof(ifr));
 837         strcpy(ifr.ifr_name, dev->ifname);
 838         ifr.ifr_data = (caddr_t) &ecmd;
 839         ecmd.cmd = ETHTOOL_GSET;
 840
 841         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 842                 c = blobmsg_open_array(b, "link-advertising");
 843                 system_add_link_modes(b, ecmd.advertising);
 844                 blobmsg_close_array(b, c);
 845
 846                 c = blobmsg_open_array(b, "link-supported");
 847                 system_add_link_modes(b, ecmd.supported);
 848                 blobmsg_close_array(b, c);
 849
 850                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 851                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 852                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 853                 blobmsg_add_string_buffer(b);
 854         }
 855
 856         close(dir_fd);
 857         return 0;
 858 }
 859
 860 int
 861 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 862 {
 863         const char *const counters[] = {
 864                 "collisions",     "rx_frame_errors",   "tx_compressed",
 865                 "multicast",      "rx_length_errors",  "tx_dropped",
 866                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 867                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 868                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 869                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 870                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 871                 "rx_fifo_errors", "tx_carrier_errors",
 872         };
 873         char buf[64];
 874         int stats_dir;
 875         int i;
 876         uint64_t val = 0;
 877
 878         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 879         stats_dir = open(buf, O_DIRECTORY);
 880         if (stats_dir < 0)
 881                 return -1;
 882
 883         for (i = 0; i < ARRAY_SIZE(counters); i++)
 884                 if (read_uint64_file(stats_dir, counters[i], &val))
 885                         blobmsg_add_u64(b, counters[i], val);
 886
 887         close(stats_dir);
 888         return 0;
 889 }
 890
 891 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 892 {
 893         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 894         int alen = v4 ? 4 : 16;
 895         unsigned int flags = 0;
 896         struct ifaddrmsg ifa = {
 897                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 898                 .ifa_prefixlen = addr->mask,
 899                 .ifa_index = dev->ifindex,
 900         };
 901
 902         struct nl_msg *msg;
 903         if (cmd == RTM_NEWADDR)
 904                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 905
 906         msg = nlmsg_alloc_simple(cmd, flags);
 907         if (!msg)
 908                 return -1;
 909
 910         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 911         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 912         if (v4) {
 913                 if (addr->broadcast)
 914                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 915                 if (addr->point_to_point)
 916                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 917         } else {
 918                 time_t now = system_get_rtime();
 919                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
 920
 921                 if (addr->preferred_until) {
 922                         int preferred = addr->preferred_until - now;
 923                         if (preferred < 0)
 924                                 preferred = 0;
 925
 926                         cinfo.ifa_prefered = preferred;
 927                 }
 928
 929                 if (addr->valid_until) {
 930                         int valid = addr->valid_until - now;
 931                         if (valid <= 0)
 932                                 return -1;
 933
 934                         cinfo.ifa_valid = valid;
 935                 }
 936
 937                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
 938         }
 939
 940         return system_rtnl_call(msg);
 941 }
 942
 943 int system_add_address(struct device *dev, struct device_addr *addr)
 944 {
 945         return system_addr(dev, addr, RTM_NEWADDR);
 946 }
 947
 948 int system_del_address(struct device *dev, struct device_addr *addr)
 949 {
 950         return system_addr(dev, addr, RTM_DELADDR);
 951 }
 952
 953 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 954 {
 955         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 956         bool have_gw;
 957         unsigned int flags = 0;
 958
 959         if (alen == 4)
 960                 have_gw = !!route->nexthop.in.s_addr;
 961         else
 962                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 963                         route->nexthop.in6.s6_addr32[1] ||
 964                         route->nexthop.in6.s6_addr32[2] ||
 965                         route->nexthop.in6.s6_addr32[3];
 966
 967         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 968                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 969
 970         unsigned int table = (route->flags & DEVROUTE_TABLE) ? 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 void tunnel_parm_init(struct ip_tunnel_parm *p)
1283 {
1284         memset(p, 0, sizeof(*p));
1285         p->iph.version = 4;
1286         p->iph.ihl = 5;
1287         p->iph.frag_off = htons(IP_DF);
1288 }
1289
1290 static int tunnel_ioctl(const char *name, int cmd, void *p)
1291 {
1292         struct ifreq ifr;
1293
1294         memset(&ifr, 0, sizeof(ifr));
1295         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1296         ifr.ifr_ifru.ifru_data = p;
1297         return ioctl(sock_ioctl, cmd, &ifr);
1298 }
1299
1300 int system_del_ip_tunnel(const char *name)
1301 {
1302         struct ip_tunnel_parm p;
1303
1304         tunnel_parm_init(&p);
1305         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
1306 }
1307
1308 int system_update_ipv6_mtu(struct device *dev, int mtu)
1309 {
1310         int ret = -1;
1311         char buf[64];
1312         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1313                         dev->ifname);
1314
1315         int fd = open(buf, O_RDWR);
1316         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1317         if (len < 0)
1318                 goto out;
1319
1320         buf[len] = 0;
1321         ret = atoi(buf);
1322
1323         if (!mtu || ret <= mtu)
1324                 goto out;
1325
1326         lseek(fd, 0, SEEK_SET);
1327         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1328                 ret = -1;
1329
1330 out:
1331         close(fd);
1332         return ret;
1333 }
1334
1335 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1336 {
1337         if (!attr)
1338                 return 1;
1339
1340         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
1341 }
1342
1343
1344 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1345 {
1346         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1347         struct blob_attr *cur;
1348         struct ip_tunnel_parm p;
1349         const char *base, *str;
1350         bool is_sit;
1351
1352         system_del_ip_tunnel(name);
1353
1354         tunnel_parm_init(&p);
1355
1356         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1357                 blob_data(attr), blob_len(attr));
1358
1359         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1360                 return -EINVAL;
1361         str = blobmsg_data(cur);
1362         is_sit = !strcmp(str, "sit");
1363
1364         if (is_sit) {
1365                 p.iph.protocol = IPPROTO_IPV6;
1366                 base = "sit0";
1367         } else
1368                 return -EINVAL;
1369
1370         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1371                 return -EINVAL;
1372
1373         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1374                 return -EINVAL;
1375
1376         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1377                 unsigned int val = blobmsg_get_u32(cur);
1378
1379                 if (val > 255)
1380                         return -EINVAL;
1381
1382                 p.iph.ttl = val;
1383         }
1384
1385         strncpy(p.name, name, sizeof(p.name));
1386         if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
1387                 return -1;
1388
1389 #ifdef SIOCADD6RD
1390         cur = tb[TUNNEL_ATTR_6RD_PREFIX];
1391         if (cur && is_sit) {
1392                 unsigned int mask;
1393                 struct ip_tunnel_6rd p6;
1394
1395                 memset(&p6, 0, sizeof(p6));
1396
1397                 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1398                                         &p6.prefix, &mask) || mask > 128)
1399                         return -EINVAL;
1400                 p6.prefixlen = mask;
1401
1402                 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1403                         if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1404                                                 &p6.relay_prefix, &mask) || mask > 32)
1405                                 return -EINVAL;
1406                         p6.relay_prefixlen = mask;
1407                 }
1408
1409                 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1410                         system_del_ip_tunnel(name);
1411                         return -1;
1412                 }
1413         }
1414 #endif
1415
1416         return 0;
1417 }