system-linux.c

   1 #define _GNU_SOURCE
   2
   3 #include <sys/socket.h>
   4 #include <sys/ioctl.h>
   5 #include <sys/stat.h>
   6 #include <sys/syscall.h>
   7
   8 #include <linux/rtnetlink.h>
   9 #include <linux/sockios.h>
  10 #include <linux/if_vlan.h>
  11 #include <linux/if_bridge.h>
  12
  13 #include <unistd.h>
  14 #include <string.h>
  15 #include <fcntl.h>
  16 #include <glob.h>
  17
  18 #include <netlink/msg.h>
  19 #include <netlink/attr.h>
  20 #include <netlink/socket.h>
  21 #include <libubox/uloop.h>
  22
  23 #include "netifd.h"
  24 #include "device.h"
  25 #include "system.h"
  26
  27 struct event_socket {
  28         struct uloop_fd uloop;
  29         struct nl_sock *sock;
  30         struct nl_cb *cb;
  31 };
  32
  33 static int sock_ioctl = -1;
  34 static struct nl_sock *sock_rtnl = NULL;
  35
  36 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  37
  38 static void
  39 handler_nl_event(struct uloop_fd *u, unsigned int events)
  40 {
  41         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  42         nl_recvmsgs(ev->sock, ev->cb);
  43 }
  44
  45 static struct nl_sock *
  46 create_socket(int protocol)
  47 {
  48         struct nl_sock *sock;
  49
  50         sock = nl_socket_alloc();
  51         if (!sock)
  52                 return NULL;
  53
  54         if (nl_connect(sock, protocol))
  55                 return NULL;
  56
  57         return sock;
  58 }
  59
  60 static bool
  61 create_event_socket(struct event_socket *ev, int protocol,
  62                     int (*cb)(struct nl_msg *msg, void *arg))
  63 {
  64         // Prepare socket for link events
  65         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
  66         if (!ev->cb)
  67                 return false;
  68
  69         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
  70
  71         ev->sock = create_socket(protocol);
  72         if (!ev->sock)
  73                 return false;
  74
  75         ev->uloop.fd = nl_socket_get_fd(ev->sock);
  76         ev->uloop.cb = handler_nl_event;
  77         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
  78         return true;
  79 }
  80
  81 int system_init(void)
  82 {
  83         static struct event_socket rtnl_event;
  84
  85         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
  86         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
  87
  88         // Prepare socket for routing / address control
  89         sock_rtnl = create_socket(NETLINK_ROUTE);
  90         if (!sock_rtnl)
  91                 return -1;
  92
  93         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
  94                 return -1;
  95
  96         // Receive network link events form kernel
  97         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
  98
  99         return 0;
 100 }
 101
 102 static void system_set_sysctl(const char *path, const char *val)
 103 {
 104         int fd;
 105
 106         fd = open(path, O_WRONLY);
 107         if (fd < 0)
 108                 return;
 109
 110         write(fd, val, strlen(val));
 111         close(fd);
 112 }
 113
 114 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 115 {
 116         static char buf[256];
 117
 118         snprintf(buf, sizeof(buf), path, val);
 119         system_set_sysctl(buf, val);
 120 }
 121
 122 static void system_set_disable_ipv6(struct device *dev, const char *val)
 123 {
 124         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 125 }
 126
 127 // Evaluate netlink messages
 128 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 129 {
 130         struct nlmsghdr *nh = nlmsg_hdr(msg);
 131         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 132         struct nlattr *nla[__IFLA_MAX];
 133
 134         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 135                 goto out;
 136
 137         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 138         if (!nla[IFLA_IFNAME])
 139                 goto out;
 140
 141         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 142         if (!dev)
 143                 goto out;
 144
 145         dev->ifindex = ifi->ifi_index;
 146         device_set_present(dev, (nh->nlmsg_type == RTM_NEWLINK));
 147
 148 out:
 149         return 0;
 150 }
 151
 152 static int system_rtnl_call(struct nl_msg *msg)
 153 {
 154         int s = -(nl_send_auto_complete(sock_rtnl, msg)
 155                         || nl_wait_for_ack(sock_rtnl));
 156         nlmsg_free(msg);
 157         return s;
 158 }
 159
 160 int system_bridge_delbr(struct device *bridge)
 161 {
 162         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 163 }
 164
 165 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 166 {
 167         struct ifreq ifr;
 168         if (dev)
 169                 ifr.ifr_ifindex = dev->ifindex;
 170         else
 171                 ifr.ifr_data = data;
 172         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 173         return ioctl(sock_ioctl, cmd, &ifr);
 174 }
 175
 176 int system_bridge_addif(struct device *bridge, struct device *dev)
 177 {
 178         system_set_disable_ipv6(dev, "1");
 179         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 180 }
 181
 182 int system_bridge_delif(struct device *bridge, struct device *dev)
 183 {
 184         system_set_disable_ipv6(dev, "0");
 185         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 186 }
 187
 188 static bool system_is_bridge(const char *name, char *buf, int buflen)
 189 {
 190         struct stat st;
 191
 192         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 193         if (stat(buf, &st) < 0)
 194                 return false;
 195
 196         return true;
 197 }
 198
 199 static char *system_get_bridge(const char *name, char *buf, int buflen)
 200 {
 201         char *path;
 202         ssize_t len;
 203         glob_t gl;
 204
 205         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 206         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 207                 return NULL;
 208
 209         if (gl.gl_pathc == 0)
 210                 return NULL;
 211
 212         len = readlink(gl.gl_pathv[0], buf, buflen);
 213         if (len < 0)
 214                 return NULL;
 215
 216         buf[len] = 0;
 217         path = strrchr(buf, '/');
 218         if (!path)
 219                 return NULL;
 220
 221         return path + 1;
 222 }
 223
 224 static int system_if_resolve(struct device *dev)
 225 {
 226         struct ifreq ifr;
 227         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 228         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 229                 return ifr.ifr_ifindex;
 230         else
 231                 return 0;
 232 }
 233
 234 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 235 {
 236         struct ifreq ifr;
 237         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 238         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 239         ifr.ifr_flags |= add;
 240         ifr.ifr_flags &= ~rem;
 241         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 242 }
 243
 244 struct clear_data {
 245         struct nl_msg *msg;
 246         struct device *dev;
 247         int type;
 248         int size;
 249         int af;
 250 };
 251
 252
 253 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 254 {
 255         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 256
 257         return ifa->ifa_index == ifindex;
 258 }
 259
 260 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 261 {
 262         struct nlattr *tb[__RTA_MAX];
 263
 264         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 265         if (!tb[RTA_OIF])
 266                 return false;
 267
 268         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 269 }
 270
 271 static int cb_clear_event(struct nl_msg *msg, void *arg)
 272 {
 273         struct clear_data *clr = arg;
 274         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 275         bool (*cb)(struct nlmsghdr *, int ifindex);
 276         int type;
 277
 278         switch(clr->type) {
 279         case RTM_GETADDR:
 280                 type = RTM_DELADDR;
 281                 if (hdr->nlmsg_type != RTM_NEWADDR)
 282                         return NL_SKIP;
 283
 284                 cb = check_ifaddr;
 285                 break;
 286         case RTM_GETROUTE:
 287                 type = RTM_DELROUTE;
 288                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 289                         return NL_SKIP;
 290
 291                 cb = check_route;
 292                 break;
 293         default:
 294                 return NL_SKIP;
 295         }
 296
 297         if (!cb(hdr, clr->dev->ifindex))
 298                 return NL_SKIP;
 299
 300         D(SYSTEM, "Remove %s from device %s\n",
 301           type == RTM_DELADDR ? "an address" : "a route",
 302           clr->dev->ifname);
 303         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 304         hdr = nlmsg_hdr(clr->msg);
 305         hdr->nlmsg_type = type;
 306         hdr->nlmsg_flags = NLM_F_REQUEST;
 307
 308         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 309                 nl_wait_for_ack(sock_rtnl);
 310
 311         return NL_SKIP;
 312 }
 313
 314 static int
 315 cb_finish_event(struct nl_msg *msg, void *arg)
 316 {
 317         int *pending = arg;
 318         *pending = 0;
 319         return NL_STOP;
 320 }
 321
 322 static int
 323 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 324 {
 325         int *pending = arg;
 326         *pending = err->error;
 327         return NL_STOP;
 328 }
 329
 330 static void
 331 system_if_clear_entries(struct device *dev, int type, int af)
 332 {
 333         struct clear_data clr;
 334         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 335         struct rtmsg rtm = {
 336                 .rtm_family = af,
 337                 .rtm_flags = RTM_F_CLONED,
 338         };
 339         int flags = NLM_F_DUMP;
 340         int pending = 1;
 341
 342         clr.af = af;
 343         clr.dev = dev;
 344         clr.type = type;
 345         switch (type) {
 346         case RTM_GETADDR:
 347                 clr.size = sizeof(struct rtgenmsg);
 348                 break;
 349         case RTM_GETROUTE:
 350                 clr.size = sizeof(struct rtmsg);
 351                 break;
 352         default:
 353                 return;
 354         }
 355
 356         if (!cb)
 357                 return;
 358
 359         clr.msg = nlmsg_alloc_simple(type, flags);
 360         if (!clr.msg)
 361                 goto out;
 362
 363         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 364         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 365         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 366         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 367
 368         nl_send_auto_complete(sock_rtnl, clr.msg);
 369         while (pending > 0)
 370                 nl_recvmsgs(sock_rtnl, cb);
 371
 372         nlmsg_free(clr.msg);
 373 out:
 374         nl_cb_put(cb);
 375 }
 376
 377 /*
 378  * Clear bridge (membership) state and bring down device
 379  */
 380 void system_if_clear_state(struct device *dev)
 381 {
 382         static char buf[256];
 383         char *bridge;
 384
 385         if (dev->external)
 386                 return;
 387
 388         dev->ifindex = system_if_resolve(dev);
 389         if (!dev->ifindex)
 390                 return;
 391
 392         system_if_flags(dev->ifname, 0, IFF_UP);
 393
 394         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 395                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 396                 system_bridge_delbr(dev);
 397                 return;
 398         }
 399
 400         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 401         if (bridge) {
 402                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 403                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 404         }
 405
 406         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 407         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 408         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 409         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 410         system_set_disable_ipv6(dev, "0");
 411 }
 412
 413 static inline unsigned long
 414 sec_to_jiffies(int val)
 415 {
 416         return (unsigned long) val * 100;
 417 }
 418
 419 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 420 {
 421         unsigned long args[4] = {};
 422
 423         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 424                 return -1;
 425
 426         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 427         args[1] = !!cfg->stp;
 428         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 429
 430         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 431         args[1] = sec_to_jiffies(cfg->forward_delay);
 432         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 433
 434         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 435                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 436
 437         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 438                 args[0] = BRCTL_SET_AGEING_TIME;
 439                 args[1] = sec_to_jiffies(cfg->ageing_time);
 440                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 441         }
 442
 443         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 444                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 445                 args[1] = sec_to_jiffies(cfg->hello_time);
 446                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 447         }
 448
 449         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 450                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 451                 args[1] = sec_to_jiffies(cfg->max_age);
 452                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int system_vlan(struct device *dev, int id)
 459 {
 460         struct vlan_ioctl_args ifr = {
 461                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 462                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 463         };
 464
 465         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 466
 467         if (id < 0) {
 468                 ifr.cmd = DEL_VLAN_CMD;
 469                 ifr.u.VID = 0;
 470         } else {
 471                 ifr.cmd = ADD_VLAN_CMD;
 472                 ifr.u.VID = id;
 473         }
 474         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 475         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 476 }
 477
 478 int system_vlan_add(struct device *dev, int id)
 479 {
 480         return system_vlan(dev, id);
 481 }
 482
 483 int system_vlan_del(struct device *dev)
 484 {
 485         return system_vlan(dev, -1);
 486 }
 487
 488 static void
 489 system_if_apply_settings(struct device *dev)
 490 {
 491         struct ifreq ifr;
 492
 493         memset(&ifr, 0, sizeof(ifr));
 494         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 495         if (dev->flags & DEV_OPT_MTU) {
 496                 ifr.ifr_mtu = dev->mtu;
 497                 ioctl(sock_ioctl, SIOCSIFMTU, &ifr);
 498         }
 499         if (dev->flags & DEV_OPT_TXQUEUELEN) {
 500                 ifr.ifr_qlen = dev->txqueuelen;
 501                 ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr);
 502         }
 503         if (dev->flags & DEV_OPT_MACADDR) {
 504                 memcpy(&ifr.ifr_hwaddr, dev->macaddr, sizeof(dev->macaddr));
 505                 ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr);
 506         }
 507
 508         dev->ifindex = system_if_resolve(dev);
 509 }
 510
 511 int system_if_up(struct device *dev)
 512 {
 513         system_if_apply_settings(dev);
 514         return system_if_flags(dev->ifname, IFF_UP, 0);
 515 }
 516
 517 int system_if_down(struct device *dev)
 518 {
 519         return system_if_flags(dev->ifname, 0, IFF_UP);
 520 }
 521
 522 int system_if_check(struct device *dev)
 523 {
 524         device_set_present(dev, (system_if_resolve(dev) >= 0));
 525         return 0;
 526 }
 527
 528 int system_if_dump_stats(struct device *dev, struct blob_buf *b)
 529 {
 530         const char *const counters[] = {
 531                 "collisions",     "rx_frame_errors",   "tx_compressed",
 532                 "multicast",      "rx_length_errors",  "tx_dropped",
 533                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 534                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 535                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 536                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 537                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 538                 "rx_fifo_errors", "tx_carrier_errors",
 539         };
 540         char buf[64];
 541         int stats_dir;
 542         int i, fd, len;
 543
 544         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 545         stats_dir = open(buf, O_DIRECTORY);
 546         if (stats_dir < 0)
 547                 return -1;
 548
 549         for (i = 0; i < ARRAY_SIZE(counters); i++) {
 550                 fd = openat(stats_dir, counters[i], O_RDONLY);
 551                 if (fd < 0)
 552                         continue;
 553
 554 retry:
 555                 len = read(fd, buf, sizeof(buf));
 556                 if (len < 0) {
 557                         if (errno == EINTR)
 558                                 goto retry;
 559                         continue;
 560                 }
 561
 562                 buf[len] = 0;
 563                 blobmsg_add_u32(b, counters[i], strtoul(buf, NULL, 0));
 564                 close(fd);
 565         }
 566
 567         close(stats_dir);
 568         return 0;
 569 }
 570
 571 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 572 {
 573         int alen = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 574         struct ifaddrmsg ifa = {
 575                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 576                 .ifa_prefixlen = addr->mask,
 577                 .ifa_index = dev->ifindex,
 578         };
 579
 580         struct nl_msg *msg;
 581
 582         dev = addr->device;
 583         if (dev) {
 584                 if (!dev->ifindex)
 585                         return -1;
 586
 587                 ifa.ifa_index = dev->ifindex;
 588         }
 589
 590         msg = nlmsg_alloc_simple(cmd, 0);
 591         if (!msg)
 592                 return -1;
 593
 594         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 595         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 596         return system_rtnl_call(msg);
 597 }
 598
 599 int system_add_address(struct device *dev, struct device_addr *addr)
 600 {
 601         return system_addr(dev, addr, RTM_NEWADDR);
 602 }
 603
 604 int system_del_address(struct device *dev, struct device_addr *addr)
 605 {
 606         return system_addr(dev, addr, RTM_DELADDR);
 607 }
 608
 609 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 610 {
 611         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 612         bool have_gw;
 613         unsigned int flags = 0;
 614         int ifindex = dev->ifindex;
 615
 616         if (alen == 4)
 617                 have_gw = !!route->nexthop.in.s_addr;
 618         else
 619                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 620                         route->nexthop.in6.s6_addr32[1] ||
 621                         route->nexthop.in6.s6_addr32[2] ||
 622                         route->nexthop.in6.s6_addr32[3];
 623
 624         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 625                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 626
 627         struct rtmsg rtm = {
 628                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 629                 .rtm_dst_len = route->mask,
 630                 .rtm_table = RT_TABLE_MAIN,
 631                 .rtm_protocol = RTPROT_BOOT,
 632                 .rtm_scope = scope,
 633                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 634         };
 635         struct nl_msg *msg;
 636
 637         if (cmd == RTM_NEWROUTE)
 638                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 639
 640         dev = route->device;
 641         if (dev) {
 642                 if (!dev->ifindex)
 643                         return -1;
 644
 645                 ifindex = dev->ifindex;
 646         }
 647
 648         msg = nlmsg_alloc_simple(cmd, flags);
 649         if (!msg)
 650                 return -1;
 651
 652         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 653
 654         if (route->mask)
 655                 nla_put(msg, RTA_DST, alen, &route->addr);
 656
 657         if (have_gw)
 658                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 659
 660         if (route->flags & DEVADDR_DEVICE)
 661                 nla_put_u32(msg, RTA_OIF, ifindex);
 662
 663         return system_rtnl_call(msg);
 664 }
 665
 666 int system_add_route(struct device *dev, struct device_route *route)
 667 {
 668         return system_rt(dev, route, RTM_NEWROUTE);
 669 }
 670
 671 int system_del_route(struct device *dev, struct device_route *route)
 672 {
 673         return system_rt(dev, route, RTM_DELROUTE);
 674 }
 675
 676 int system_flush_routes(void)
 677 {
 678         const char *names[] = {
 679                 "/proc/sys/net/ipv4/route/flush",
 680                 "/proc/sys/net/ipv6/route/flush"
 681         };
 682         int fd, i;
 683
 684         for (i = 0; i < ARRAY_SIZE(names); i++) {
 685                 fd = open(names[i], O_WRONLY);
 686                 if (fd < 0)
 687                         continue;
 688
 689                 write(fd, "-1", 2);
 690                 close(fd);
 691         }
 692         return 0;
 693 }
 694
 695 time_t system_get_rtime(void)
 696 {
 697         struct timespec ts;
 698         struct timeval tv;
 699
 700         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
 701                 return ts.tv_sec;
 702
 703         if (gettimeofday(&tv, NULL) == 0)
 704                 return tv.tv_sec;
 705
 706         return 0;
 707 }