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