system-linux.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #define _GNU_SOURCE
  15
  16 #include <sys/socket.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/stat.h>
  19 #include <sys/syscall.h>
  20
  21 #include <net/if.h>
  22 #include <net/if_arp.h>
  23
  24 #include <arpa/inet.h>
  25 #include <netinet/in.h>
  26
  27 #include <linux/rtnetlink.h>
  28 #include <linux/sockios.h>
  29 #include <linux/ip.h>
  30 #include <linux/if_vlan.h>
  31 #include <linux/if_bridge.h>
  32 #include <linux/if_tunnel.h>
  33 #include <linux/ethtool.h>
  34
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <fcntl.h>
  38 #include <glob.h>
  39 #include <time.h>
  40
  41 #include <netlink/msg.h>
  42 #include <netlink/attr.h>
  43 #include <netlink/socket.h>
  44 #include <libubox/uloop.h>
  45
  46 #include "netifd.h"
  47 #include "device.h"
  48 #include "system.h"
  49
  50 struct event_socket {
  51         struct uloop_fd uloop;
  52         struct nl_sock *sock;
  53         struct nl_cb *cb;
  54 };
  55
  56 static int sock_ioctl = -1;
  57 static struct nl_sock *sock_rtnl = NULL;
  58
  59 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  60 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  61
  62 static char dev_buf[256];
  63
  64 static void
  65 handler_nl_event(struct uloop_fd *u, unsigned int events)
  66 {
  67         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  68         nl_recvmsgs(ev->sock, ev->cb);
  69 }
  70
  71 static struct nl_sock *
  72 create_socket(int protocol, int groups)
  73 {
  74         struct nl_sock *sock;
  75
  76         sock = nl_socket_alloc();
  77         if (!sock)
  78                 return NULL;
  79
  80         if (groups)
  81                 nl_join_groups(sock, groups);
  82
  83         if (nl_connect(sock, protocol))
  84                 return NULL;
  85
  86         return sock;
  87 }
  88
  89 static bool
  90 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
  91                         uloop_fd_handler cb)
  92 {
  93         ev->sock = create_socket(protocol, groups);
  94         if (!ev->sock)
  95                 return false;
  96
  97         ev->uloop.fd = nl_socket_get_fd(ev->sock);
  98         ev->uloop.cb = cb;
  99         uloop_fd_add(&ev->uloop, ULOOP_READ | ULOOP_EDGE_TRIGGER);
 100         return true;
 101 }
 102
 103 static bool
 104 create_event_socket(struct event_socket *ev, int protocol,
 105                     int (*cb)(struct nl_msg *msg, void *arg))
 106 {
 107         // Prepare socket for link events
 108         ev->cb = nl_cb_alloc(NL_CB_DEFAULT);
 109         if (!ev->cb)
 110                 return false;
 111
 112         nl_cb_set(ev->cb, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 113
 114         return create_raw_event_socket(ev, protocol, 0, handler_nl_event);
 115 }
 116
 117 int system_init(void)
 118 {
 119         static struct event_socket rtnl_event;
 120         static struct event_socket hotplug_event;
 121
 122         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 123         fcntl(sock_ioctl, F_SETFD, fcntl(sock_ioctl, F_GETFD) | FD_CLOEXEC);
 124
 125         // Prepare socket for routing / address control
 126         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 127         if (!sock_rtnl)
 128                 return -1;
 129
 130         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 131                 return -1;
 132
 133         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 134                                      handle_hotplug_event))
 135                 return -1;
 136
 137         // Receive network link events form kernel
 138         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 139
 140         return 0;
 141 }
 142
 143 static void system_set_sysctl(const char *path, const char *val)
 144 {
 145         int fd;
 146
 147         fd = open(path, O_WRONLY);
 148         if (fd < 0)
 149                 return;
 150
 151         write(fd, val, strlen(val));
 152         close(fd);
 153 }
 154
 155 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 156 {
 157         snprintf(dev_buf, sizeof(dev_buf), path, val);
 158         system_set_sysctl(dev_buf, val);
 159 }
 160
 161 static void system_set_disable_ipv6(struct device *dev, const char *val)
 162 {
 163         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 164 }
 165
 166 // Evaluate netlink messages
 167 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 168 {
 169         struct nlmsghdr *nh = nlmsg_hdr(msg);
 170         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 171         struct nlattr *nla[__IFLA_MAX];
 172
 173         if (nh->nlmsg_type != RTM_DELLINK && nh->nlmsg_type != RTM_NEWLINK)
 174                 goto out;
 175
 176         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 177         if (!nla[IFLA_IFNAME])
 178                 goto out;
 179
 180         struct device *dev = device_get(RTA_DATA(nla[IFLA_IFNAME]), false);
 181         if (!dev)
 182                 goto out;
 183
 184         dev->ifindex = ifi->ifi_index;
 185         /* TODO: parse link status */
 186
 187 out:
 188         return 0;
 189 }
 190
 191 static void
 192 handle_hotplug_msg(char *data, int size)
 193 {
 194         const char *subsystem = NULL, *interface = NULL;
 195         char *cur, *end, *sep;
 196         struct device *dev;
 197         int skip;
 198         bool add;
 199
 200         if (!strncmp(data, "add@", 4))
 201                 add = true;
 202         else if (!strncmp(data, "remove@", 7))
 203                 add = false;
 204         else
 205                 return;
 206
 207         skip = strlen(data) + 1;
 208         end = data + size;
 209
 210         for (cur = data + skip; cur < end; cur += skip) {
 211                 skip = strlen(cur) + 1;
 212
 213                 sep = strchr(cur, '=');
 214                 if (!sep)
 215                         continue;
 216
 217                 *sep = 0;
 218                 if (!strcmp(cur, "INTERFACE"))
 219                         interface = sep + 1;
 220                 else if (!strcmp(cur, "SUBSYSTEM")) {
 221                         subsystem = sep + 1;
 222                         if (strcmp(subsystem, "net") != 0)
 223                                 return;
 224                 }
 225                 if (subsystem && interface)
 226                         goto found;
 227         }
 228         return;
 229
 230 found:
 231         dev = device_get(interface, false);
 232         if (!dev)
 233                 return;
 234
 235         if (dev->type != &simple_device_type)
 236                 return;
 237
 238         device_set_present(dev, add);
 239 }
 240
 241 static void
 242 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 243 {
 244         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 245         struct sockaddr_nl nla;
 246         unsigned char *buf = NULL;
 247         int size;
 248
 249         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 250                 if (nla.nl_pid == 0)
 251                         handle_hotplug_msg((char *) buf, size);
 252
 253                 free(buf);
 254         }
 255 }
 256
 257 static int system_rtnl_call(struct nl_msg *msg)
 258 {
 259         int ret;
 260
 261         ret = nl_send_auto_complete(sock_rtnl, msg);
 262         nlmsg_free(msg);
 263
 264         if (ret < 0)
 265                 return ret;
 266
 267         return nl_wait_for_ack(sock_rtnl);
 268 }
 269
 270 int system_bridge_delbr(struct device *bridge)
 271 {
 272         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 273 }
 274
 275 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 276 {
 277         struct ifreq ifr;
 278         if (dev)
 279                 ifr.ifr_ifindex = dev->ifindex;
 280         else
 281                 ifr.ifr_data = data;
 282         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 283         return ioctl(sock_ioctl, cmd, &ifr);
 284 }
 285
 286 static bool system_is_bridge(const char *name, char *buf, int buflen)
 287 {
 288         struct stat st;
 289
 290         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 291         if (stat(buf, &st) < 0)
 292                 return false;
 293
 294         return true;
 295 }
 296
 297 static char *system_get_bridge(const char *name, char *buf, int buflen)
 298 {
 299         char *path;
 300         ssize_t len;
 301         glob_t gl;
 302
 303         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 304         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 305                 return NULL;
 306
 307         if (gl.gl_pathc == 0)
 308                 return NULL;
 309
 310         len = readlink(gl.gl_pathv[0], buf, buflen);
 311         if (len < 0)
 312                 return NULL;
 313
 314         buf[len] = 0;
 315         path = strrchr(buf, '/');
 316         if (!path)
 317                 return NULL;
 318
 319         return path + 1;
 320 }
 321
 322 int system_bridge_addif(struct device *bridge, struct device *dev)
 323 {
 324         char *oldbr;
 325
 326         system_set_disable_ipv6(dev, "1");
 327         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 328         if (oldbr && !strcmp(oldbr, bridge->ifname))
 329                 return 0;
 330
 331         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 332 }
 333
 334 int system_bridge_delif(struct device *bridge, struct device *dev)
 335 {
 336         system_set_disable_ipv6(dev, "0");
 337         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 338 }
 339
 340 static int system_if_resolve(struct device *dev)
 341 {
 342         struct ifreq ifr;
 343         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 344         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 345                 return ifr.ifr_ifindex;
 346         else
 347                 return 0;
 348 }
 349
 350 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 351 {
 352         struct ifreq ifr;
 353         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 354         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 355         ifr.ifr_flags |= add;
 356         ifr.ifr_flags &= ~rem;
 357         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 358 }
 359
 360 struct clear_data {
 361         struct nl_msg *msg;
 362         struct device *dev;
 363         int type;
 364         int size;
 365         int af;
 366 };
 367
 368
 369 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 370 {
 371         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 372
 373         return ifa->ifa_index == ifindex;
 374 }
 375
 376 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 377 {
 378         struct nlattr *tb[__RTA_MAX];
 379
 380         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 381         if (!tb[RTA_OIF])
 382                 return false;
 383
 384         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 385 }
 386
 387 static int cb_clear_event(struct nl_msg *msg, void *arg)
 388 {
 389         struct clear_data *clr = arg;
 390         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 391         bool (*cb)(struct nlmsghdr *, int ifindex);
 392         int type;
 393
 394         switch(clr->type) {
 395         case RTM_GETADDR:
 396                 type = RTM_DELADDR;
 397                 if (hdr->nlmsg_type != RTM_NEWADDR)
 398                         return NL_SKIP;
 399
 400                 cb = check_ifaddr;
 401                 break;
 402         case RTM_GETROUTE:
 403                 type = RTM_DELROUTE;
 404                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 405                         return NL_SKIP;
 406
 407                 cb = check_route;
 408                 break;
 409         default:
 410                 return NL_SKIP;
 411         }
 412
 413         if (!cb(hdr, clr->dev->ifindex))
 414                 return NL_SKIP;
 415
 416         D(SYSTEM, "Remove %s from device %s\n",
 417           type == RTM_DELADDR ? "an address" : "a route",
 418           clr->dev->ifname);
 419         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 420         hdr = nlmsg_hdr(clr->msg);
 421         hdr->nlmsg_type = type;
 422         hdr->nlmsg_flags = NLM_F_REQUEST;
 423
 424         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 425                 nl_wait_for_ack(sock_rtnl);
 426
 427         return NL_SKIP;
 428 }
 429
 430 static int
 431 cb_finish_event(struct nl_msg *msg, void *arg)
 432 {
 433         int *pending = arg;
 434         *pending = 0;
 435         return NL_STOP;
 436 }
 437
 438 static int
 439 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 440 {
 441         int *pending = arg;
 442         *pending = err->error;
 443         return NL_STOP;
 444 }
 445
 446 static void
 447 system_if_clear_entries(struct device *dev, int type, int af)
 448 {
 449         struct clear_data clr;
 450         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 451         struct rtmsg rtm = {
 452                 .rtm_family = af,
 453                 .rtm_flags = RTM_F_CLONED,
 454         };
 455         int flags = NLM_F_DUMP;
 456         int pending = 1;
 457
 458         clr.af = af;
 459         clr.dev = dev;
 460         clr.type = type;
 461         switch (type) {
 462         case RTM_GETADDR:
 463                 clr.size = sizeof(struct rtgenmsg);
 464                 break;
 465         case RTM_GETROUTE:
 466                 clr.size = sizeof(struct rtmsg);
 467                 break;
 468         default:
 469                 return;
 470         }
 471
 472         if (!cb)
 473                 return;
 474
 475         clr.msg = nlmsg_alloc_simple(type, flags);
 476         if (!clr.msg)
 477                 goto out;
 478
 479         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 480         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 481         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 482         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 483
 484         nl_send_auto_complete(sock_rtnl, clr.msg);
 485         while (pending > 0)
 486                 nl_recvmsgs(sock_rtnl, cb);
 487
 488         nlmsg_free(clr.msg);
 489 out:
 490         nl_cb_put(cb);
 491 }
 492
 493 /*
 494  * Clear bridge (membership) state and bring down device
 495  */
 496 void system_if_clear_state(struct device *dev)
 497 {
 498         static char buf[256];
 499         char *bridge;
 500
 501         if (dev->external)
 502                 return;
 503
 504         dev->ifindex = system_if_resolve(dev);
 505         if (!dev->ifindex)
 506                 return;
 507
 508         system_if_flags(dev->ifname, 0, IFF_UP);
 509
 510         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 511                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 512                 system_bridge_delbr(dev);
 513                 return;
 514         }
 515
 516         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 517         if (bridge) {
 518                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 519                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 520         }
 521
 522         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 523         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 524         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 525         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 526         system_set_disable_ipv6(dev, "0");
 527 }
 528
 529 static inline unsigned long
 530 sec_to_jiffies(int val)
 531 {
 532         return (unsigned long) val * 100;
 533 }
 534
 535 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 536 {
 537         unsigned long args[4] = {};
 538
 539         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 540                 return -1;
 541
 542         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 543         args[1] = !!cfg->stp;
 544         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 545
 546         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 547         args[1] = sec_to_jiffies(cfg->forward_delay);
 548         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 549
 550         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 551                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 552
 553         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 554                 args[0] = BRCTL_SET_AGEING_TIME;
 555                 args[1] = sec_to_jiffies(cfg->ageing_time);
 556                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 557         }
 558
 559         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 560                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 561                 args[1] = sec_to_jiffies(cfg->hello_time);
 562                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 563         }
 564
 565         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 566                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 567                 args[1] = sec_to_jiffies(cfg->max_age);
 568                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 569         }
 570
 571         return 0;
 572 }
 573
 574 static int system_vlan(struct device *dev, int id)
 575 {
 576         struct vlan_ioctl_args ifr = {
 577                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 578                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 579         };
 580
 581         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 582
 583         if (id < 0) {
 584                 ifr.cmd = DEL_VLAN_CMD;
 585                 ifr.u.VID = 0;
 586         } else {
 587                 ifr.cmd = ADD_VLAN_CMD;
 588                 ifr.u.VID = id;
 589         }
 590         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 591         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 592 }
 593
 594 int system_vlan_add(struct device *dev, int id)
 595 {
 596         return system_vlan(dev, id);
 597 }
 598
 599 int system_vlan_del(struct device *dev)
 600 {
 601         return system_vlan(dev, -1);
 602 }
 603
 604 static void
 605 system_if_get_settings(struct device *dev, struct device_settings *s)
 606 {
 607         struct ifreq ifr;
 608
 609         memset(&ifr, 0, sizeof(ifr));
 610         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 611
 612         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 613                 s->mtu = ifr.ifr_mtu;
 614                 s->flags |= DEV_OPT_MTU;
 615         }
 616
 617         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 618                 s->txqueuelen = ifr.ifr_qlen;
 619                 s->flags |= DEV_OPT_TXQUEUELEN;
 620         }
 621
 622         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 623                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 624                 s->flags |= DEV_OPT_MACADDR;
 625         }
 626 }
 627
 628 static void
 629 system_if_apply_settings(struct device *dev, struct device_settings *s)
 630 {
 631         struct ifreq ifr;
 632
 633         memset(&ifr, 0, sizeof(ifr));
 634         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 635         if (s->flags & DEV_OPT_MTU) {
 636                 ifr.ifr_mtu = s->mtu;
 637                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 638                         s->flags &= ~DEV_OPT_MTU;
 639         }
 640         if (s->flags & DEV_OPT_TXQUEUELEN) {
 641                 ifr.ifr_qlen = s->txqueuelen;
 642                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 643                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 644         }
 645         if (s->flags & DEV_OPT_MACADDR) {
 646                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 647                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 648                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 649                         s->flags &= ~DEV_OPT_MACADDR;
 650         }
 651 }
 652
 653 int system_if_up(struct device *dev)
 654 {
 655         system_if_get_settings(dev, &dev->orig_settings);
 656         system_if_apply_settings(dev, &dev->settings);
 657         dev->ifindex = system_if_resolve(dev);
 658         return system_if_flags(dev->ifname, IFF_UP, 0);
 659 }
 660
 661 int system_if_down(struct device *dev)
 662 {
 663         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 664         dev->orig_settings.flags &= dev->settings.flags;
 665         system_if_apply_settings(dev, &dev->orig_settings);
 666         return ret;
 667 }
 668
 669 int system_if_check(struct device *dev)
 670 {
 671         device_set_present(dev, (system_if_resolve(dev) > 0));
 672         return 0;
 673 }
 674
 675 struct device *
 676 system_if_get_parent(struct device *dev)
 677 {
 678         char buf[64], *devname;
 679         int ifindex, iflink, len;
 680         FILE *f;
 681
 682         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 683         f = fopen(buf, "r");
 684         if (!f)
 685                 return NULL;
 686
 687         len = fread(buf, 1, sizeof(buf) - 1, f);
 688         fclose(f);
 689
 690         if (len <= 0)
 691                 return NULL;
 692
 693         buf[len] = 0;
 694         iflink = strtoul(buf, NULL, 0);
 695         ifindex = system_if_resolve(dev);
 696         if (!iflink || iflink == ifindex)
 697                 return NULL;
 698
 699         devname = if_indextoname(iflink, buf);
 700         if (!devname)
 701                 return NULL;
 702
 703         return device_get(devname, true);
 704 }
 705
 706 static bool
 707 read_string_file(int dir_fd, const char *file, char *buf, int len)
 708 {
 709         bool ret = false;
 710         char *c;
 711         int fd;
 712
 713         fd = openat(dir_fd, file, O_RDONLY);
 714         if (fd < 0)
 715                 return false;
 716
 717 retry:
 718         len = read(fd, buf, len - 1);
 719         if (len < 0) {
 720                 if (errno == EINTR)
 721                         goto retry;
 722         } else if (len > 0) {
 723                         buf[len] = 0;
 724
 725                         c = strchr(buf, '\n');
 726                         if (c)
 727                                 *c = 0;
 728
 729                         ret = true;
 730         }
 731
 732         close(fd);
 733
 734         return ret;
 735 }
 736
 737 static bool
 738 read_int_file(int dir_fd, const char *file, int *val)
 739 {
 740         char buf[64];
 741         bool ret = false;
 742
 743         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 744         if (ret)
 745                 *val = strtoul(buf, NULL, 0);
 746
 747         return ret;
 748 }
 749
 750 /* Assume advertised flags == supported flags */
 751 static const struct {
 752         uint32_t mask;
 753         const char *name;
 754 } ethtool_link_modes[] = {
 755         { ADVERTISED_10baseT_Half, "10H" },
 756         { ADVERTISED_10baseT_Full, "10F" },
 757         { ADVERTISED_100baseT_Half, "100H" },
 758         { ADVERTISED_100baseT_Full, "100F" },
 759         { ADVERTISED_1000baseT_Half, "1000H" },
 760         { ADVERTISED_1000baseT_Full, "1000F" },
 761 };
 762
 763 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 764 {
 765         int i;
 766         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 767                 if (mask & ethtool_link_modes[i].mask)
 768                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 769         }
 770 }
 771
 772 int
 773 system_if_dump_info(struct device *dev, struct blob_buf *b)
 774 {
 775         struct ethtool_cmd ecmd;
 776         struct ifreq ifr;
 777         char buf[64], *s;
 778         void *c;
 779         int dir_fd, val = 0;
 780
 781         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 782         dir_fd = open(buf, O_DIRECTORY);
 783
 784         if (read_int_file(dir_fd, "carrier", &val))
 785                 blobmsg_add_u8(b, "link", !!val);
 786
 787         memset(&ecmd, 0, sizeof(ecmd));
 788         memset(&ifr, 0, sizeof(ifr));
 789         strcpy(ifr.ifr_name, dev->ifname);
 790         ifr.ifr_data = (caddr_t) &ecmd;
 791         ecmd.cmd = ETHTOOL_GSET;
 792
 793         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 794                 c = blobmsg_open_array(b, "link-advertising");
 795                 system_add_link_modes(b, ecmd.advertising);
 796                 blobmsg_close_array(b, c);
 797
 798                 c = blobmsg_open_array(b, "link-supported");
 799                 system_add_link_modes(b, ecmd.supported);
 800                 blobmsg_close_array(b, c);
 801
 802                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 803                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 804                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 805                 blobmsg_add_string_buffer(b);
 806         }
 807
 808         close(dir_fd);
 809         return 0;
 810 }
 811
 812 int
 813 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 814 {
 815         const char *const counters[] = {
 816                 "collisions",     "rx_frame_errors",   "tx_compressed",
 817                 "multicast",      "rx_length_errors",  "tx_dropped",
 818                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 819                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 820                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 821                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 822                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 823                 "rx_fifo_errors", "tx_carrier_errors",
 824         };
 825         char buf[64];
 826         int stats_dir;
 827         int i, val = 0;
 828
 829         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 830         stats_dir = open(buf, O_DIRECTORY);
 831         if (stats_dir < 0)
 832                 return -1;
 833
 834         for (i = 0; i < ARRAY_SIZE(counters); i++)
 835                 if (read_int_file(stats_dir, counters[i], &val))
 836                         blobmsg_add_u32(b, counters[i], val);
 837
 838         close(stats_dir);
 839         return 0;
 840 }
 841
 842 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 843 {
 844         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 845         int alen = v4 ? 4 : 16;
 846         struct ifaddrmsg ifa = {
 847                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 848                 .ifa_prefixlen = addr->mask,
 849                 .ifa_index = dev->ifindex,
 850         };
 851
 852         struct nl_msg *msg;
 853
 854         msg = nlmsg_alloc_simple(cmd, 0);
 855         if (!msg)
 856                 return -1;
 857
 858         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 859         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 860         if (v4) {
 861                 if (addr->broadcast)
 862                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 863                 if (addr->point_to_point)
 864                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 865         }
 866
 867         return system_rtnl_call(msg);
 868 }
 869
 870 int system_add_address(struct device *dev, struct device_addr *addr)
 871 {
 872         return system_addr(dev, addr, RTM_NEWADDR);
 873 }
 874
 875 int system_del_address(struct device *dev, struct device_addr *addr)
 876 {
 877         return system_addr(dev, addr, RTM_DELADDR);
 878 }
 879
 880 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 881 {
 882         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 883         bool have_gw;
 884         unsigned int flags = 0;
 885         int ifindex = dev->ifindex;
 886
 887         if (alen == 4)
 888                 have_gw = !!route->nexthop.in.s_addr;
 889         else
 890                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 891                         route->nexthop.in6.s6_addr32[1] ||
 892                         route->nexthop.in6.s6_addr32[2] ||
 893                         route->nexthop.in6.s6_addr32[3];
 894
 895         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 896                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 897
 898         struct rtmsg rtm = {
 899                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 900                 .rtm_dst_len = route->mask,
 901                 .rtm_table = RT_TABLE_MAIN,
 902                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_BOOT,
 903                 .rtm_scope = scope,
 904                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 905         };
 906         struct nl_msg *msg;
 907
 908         if (cmd == RTM_NEWROUTE)
 909                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 910
 911         msg = nlmsg_alloc_simple(cmd, flags);
 912         if (!msg)
 913                 return -1;
 914
 915         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 916
 917         if (route->mask)
 918                 nla_put(msg, RTA_DST, alen, &route->addr);
 919
 920         if (route->metric > 0)
 921                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
 922
 923         if (have_gw)
 924                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 925
 926         nla_put_u32(msg, RTA_OIF, ifindex);
 927
 928         return system_rtnl_call(msg);
 929 }
 930
 931 int system_add_route(struct device *dev, struct device_route *route)
 932 {
 933         return system_rt(dev, route, RTM_NEWROUTE);
 934 }
 935
 936 int system_del_route(struct device *dev, struct device_route *route)
 937 {
 938         return system_rt(dev, route, RTM_DELROUTE);
 939 }
 940
 941 int system_flush_routes(void)
 942 {
 943         const char *names[] = {
 944                 "/proc/sys/net/ipv4/route/flush",
 945                 "/proc/sys/net/ipv6/route/flush"
 946         };
 947         int fd, i;
 948
 949         for (i = 0; i < ARRAY_SIZE(names); i++) {
 950                 fd = open(names[i], O_WRONLY);
 951                 if (fd < 0)
 952                         continue;
 953
 954                 write(fd, "-1", 2);
 955                 close(fd);
 956         }
 957         return 0;
 958 }
 959
 960 time_t system_get_rtime(void)
 961 {
 962         struct timespec ts;
 963         struct timeval tv;
 964
 965         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
 966                 return ts.tv_sec;
 967
 968         if (gettimeofday(&tv, NULL) == 0)
 969                 return tv.tv_sec;
 970
 971         return 0;
 972 }
 973
 974 #ifndef IP_DF
 975 #define IP_DF       0x4000
 976 #endif
 977
 978 static void tunnel_parm_init(struct ip_tunnel_parm *p)
 979 {
 980         memset(p, 0, sizeof(*p));
 981         p->iph.version = 4;
 982         p->iph.ihl = 5;
 983         p->iph.frag_off = htons(IP_DF);
 984 }
 985
 986 static int tunnel_ioctl(const char *name, int cmd, void *p)
 987 {
 988         struct ifreq ifr;
 989
 990         memset(&ifr, 0, sizeof(ifr));
 991         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 992         ifr.ifr_ifru.ifru_data = p;
 993         return ioctl(sock_ioctl, cmd, &ifr);
 994 }
 995
 996 int system_del_ip_tunnel(const char *name)
 997 {
 998         struct ip_tunnel_parm p;
 999
1000         tunnel_parm_init(&p);
1001         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
1002 }
1003
1004 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1005 {
1006         if (!attr)
1007                 return 1;
1008
1009         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
1010 }
1011
1012
1013 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1014 {
1015         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1016         struct blob_attr *cur;
1017         struct ip_tunnel_parm p;
1018         const char *base, *str;
1019         int cmd = SIOCADDTUNNEL;
1020
1021         system_del_ip_tunnel(name);
1022
1023         tunnel_parm_init(&p);
1024
1025         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1026                 blob_data(attr), blob_len(attr));
1027
1028         cur = tb[TUNNEL_ATTR_TYPE];
1029         if (!cur)
1030                 return -EINVAL;
1031
1032         str = blobmsg_data(cur);
1033         if (!strcmp(str, "sit")) {
1034                 p.iph.protocol = IPPROTO_IPV6;
1035                 base = "sit0";
1036         } else
1037                 return -EINVAL;
1038
1039         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1040                 return -EINVAL;
1041
1042         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1043                 return -EINVAL;
1044
1045         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1046                 unsigned int val = blobmsg_get_u32(cur);
1047
1048                 if (val > 255)
1049                         return -EINVAL;
1050
1051                 p.iph.ttl = val;
1052         }
1053
1054         strncpy(p.name, name, sizeof(p.name));
1055         return tunnel_ioctl(base, cmd, &p);
1056 }