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