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
 279         memset(&ifr, 0, sizeof(ifr));
 280         if (dev)
 281                 ifr.ifr_ifindex = dev->ifindex;
 282         else
 283                 ifr.ifr_data = data;
 284         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 285         return ioctl(sock_ioctl, cmd, &ifr);
 286 }
 287
 288 static bool system_is_bridge(const char *name, char *buf, int buflen)
 289 {
 290         struct stat st;
 291
 292         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 293         if (stat(buf, &st) < 0)
 294                 return false;
 295
 296         return true;
 297 }
 298
 299 static char *system_get_bridge(const char *name, char *buf, int buflen)
 300 {
 301         char *path;
 302         ssize_t len;
 303         glob_t gl;
 304
 305         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 306         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 307                 return NULL;
 308
 309         if (gl.gl_pathc == 0)
 310                 return NULL;
 311
 312         len = readlink(gl.gl_pathv[0], buf, buflen);
 313         if (len < 0)
 314                 return NULL;
 315
 316         buf[len] = 0;
 317         path = strrchr(buf, '/');
 318         if (!path)
 319                 return NULL;
 320
 321         return path + 1;
 322 }
 323
 324 int system_bridge_addif(struct device *bridge, struct device *dev)
 325 {
 326         char *oldbr;
 327
 328         system_set_disable_ipv6(dev, "1");
 329         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 330         if (oldbr && !strcmp(oldbr, bridge->ifname))
 331                 return 0;
 332
 333         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 334 }
 335
 336 int system_bridge_delif(struct device *bridge, struct device *dev)
 337 {
 338         system_set_disable_ipv6(dev, "0");
 339         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 340 }
 341
 342 static int system_if_resolve(struct device *dev)
 343 {
 344         struct ifreq ifr;
 345         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 346         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 347                 return ifr.ifr_ifindex;
 348         else
 349                 return 0;
 350 }
 351
 352 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 353 {
 354         struct ifreq ifr;
 355
 356         memset(&ifr, 0, sizeof(ifr));
 357         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 358         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 359         ifr.ifr_flags |= add;
 360         ifr.ifr_flags &= ~rem;
 361         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 362 }
 363
 364 struct clear_data {
 365         struct nl_msg *msg;
 366         struct device *dev;
 367         int type;
 368         int size;
 369         int af;
 370 };
 371
 372
 373 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 374 {
 375         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 376
 377         return ifa->ifa_index == ifindex;
 378 }
 379
 380 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 381 {
 382         struct nlattr *tb[__RTA_MAX];
 383
 384         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 385         if (!tb[RTA_OIF])
 386                 return false;
 387
 388         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 389 }
 390
 391 static int cb_clear_event(struct nl_msg *msg, void *arg)
 392 {
 393         struct clear_data *clr = arg;
 394         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 395         bool (*cb)(struct nlmsghdr *, int ifindex);
 396         int type;
 397
 398         switch(clr->type) {
 399         case RTM_GETADDR:
 400                 type = RTM_DELADDR;
 401                 if (hdr->nlmsg_type != RTM_NEWADDR)
 402                         return NL_SKIP;
 403
 404                 cb = check_ifaddr;
 405                 break;
 406         case RTM_GETROUTE:
 407                 type = RTM_DELROUTE;
 408                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 409                         return NL_SKIP;
 410
 411                 cb = check_route;
 412                 break;
 413         default:
 414                 return NL_SKIP;
 415         }
 416
 417         if (!cb(hdr, clr->dev->ifindex))
 418                 return NL_SKIP;
 419
 420         D(SYSTEM, "Remove %s from device %s\n",
 421           type == RTM_DELADDR ? "an address" : "a route",
 422           clr->dev->ifname);
 423         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 424         hdr = nlmsg_hdr(clr->msg);
 425         hdr->nlmsg_type = type;
 426         hdr->nlmsg_flags = NLM_F_REQUEST;
 427
 428         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 429                 nl_wait_for_ack(sock_rtnl);
 430
 431         return NL_SKIP;
 432 }
 433
 434 static int
 435 cb_finish_event(struct nl_msg *msg, void *arg)
 436 {
 437         int *pending = arg;
 438         *pending = 0;
 439         return NL_STOP;
 440 }
 441
 442 static int
 443 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 444 {
 445         int *pending = arg;
 446         *pending = err->error;
 447         return NL_STOP;
 448 }
 449
 450 static void
 451 system_if_clear_entries(struct device *dev, int type, int af)
 452 {
 453         struct clear_data clr;
 454         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 455         struct rtmsg rtm = {
 456                 .rtm_family = af,
 457                 .rtm_flags = RTM_F_CLONED,
 458         };
 459         int flags = NLM_F_DUMP;
 460         int pending = 1;
 461
 462         clr.af = af;
 463         clr.dev = dev;
 464         clr.type = type;
 465         switch (type) {
 466         case RTM_GETADDR:
 467                 clr.size = sizeof(struct rtgenmsg);
 468                 break;
 469         case RTM_GETROUTE:
 470                 clr.size = sizeof(struct rtmsg);
 471                 break;
 472         default:
 473                 return;
 474         }
 475
 476         if (!cb)
 477                 return;
 478
 479         clr.msg = nlmsg_alloc_simple(type, flags);
 480         if (!clr.msg)
 481                 goto out;
 482
 483         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 484         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 485         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 486         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 487
 488         nl_send_auto_complete(sock_rtnl, clr.msg);
 489         while (pending > 0)
 490                 nl_recvmsgs(sock_rtnl, cb);
 491
 492         nlmsg_free(clr.msg);
 493 out:
 494         nl_cb_put(cb);
 495 }
 496
 497 /*
 498  * Clear bridge (membership) state and bring down device
 499  */
 500 void system_if_clear_state(struct device *dev)
 501 {
 502         static char buf[256];
 503         char *bridge;
 504
 505         if (dev->external)
 506                 return;
 507
 508         dev->ifindex = system_if_resolve(dev);
 509         if (!dev->ifindex)
 510                 return;
 511
 512         system_if_flags(dev->ifname, 0, IFF_UP);
 513
 514         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 515                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 516                 system_bridge_delbr(dev);
 517                 return;
 518         }
 519
 520         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 521         if (bridge) {
 522                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 523                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 524         }
 525
 526         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 527         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 528         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 529         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 530         system_set_disable_ipv6(dev, "0");
 531 }
 532
 533 static inline unsigned long
 534 sec_to_jiffies(int val)
 535 {
 536         return (unsigned long) val * 100;
 537 }
 538
 539 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 540 {
 541         unsigned long args[4] = {};
 542
 543         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 544                 return -1;
 545
 546         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 547         args[1] = !!cfg->stp;
 548         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 549
 550         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 551         args[1] = sec_to_jiffies(cfg->forward_delay);
 552         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 553
 554         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 555                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 556
 557         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 558                 args[0] = BRCTL_SET_AGEING_TIME;
 559                 args[1] = sec_to_jiffies(cfg->ageing_time);
 560                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 561         }
 562
 563         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 564                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 565                 args[1] = sec_to_jiffies(cfg->hello_time);
 566                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 567         }
 568
 569         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 570                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 571                 args[1] = sec_to_jiffies(cfg->max_age);
 572                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int system_vlan(struct device *dev, int id)
 579 {
 580         struct vlan_ioctl_args ifr = {
 581                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 582                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 583         };
 584
 585         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 586
 587         if (id < 0) {
 588                 ifr.cmd = DEL_VLAN_CMD;
 589                 ifr.u.VID = 0;
 590         } else {
 591                 ifr.cmd = ADD_VLAN_CMD;
 592                 ifr.u.VID = id;
 593         }
 594         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 595         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 596 }
 597
 598 int system_vlan_add(struct device *dev, int id)
 599 {
 600         return system_vlan(dev, id);
 601 }
 602
 603 int system_vlan_del(struct device *dev)
 604 {
 605         return system_vlan(dev, -1);
 606 }
 607
 608 static void
 609 system_if_get_settings(struct device *dev, struct device_settings *s)
 610 {
 611         struct ifreq ifr;
 612
 613         memset(&ifr, 0, sizeof(ifr));
 614         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 615
 616         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 617                 s->mtu = ifr.ifr_mtu;
 618                 s->flags |= DEV_OPT_MTU;
 619         }
 620
 621         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 622                 s->txqueuelen = ifr.ifr_qlen;
 623                 s->flags |= DEV_OPT_TXQUEUELEN;
 624         }
 625
 626         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 627                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 628                 s->flags |= DEV_OPT_MACADDR;
 629         }
 630 }
 631
 632 static void
 633 system_if_apply_settings(struct device *dev, struct device_settings *s)
 634 {
 635         struct ifreq ifr;
 636
 637         memset(&ifr, 0, sizeof(ifr));
 638         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 639         if (s->flags & DEV_OPT_MTU) {
 640                 ifr.ifr_mtu = s->mtu;
 641                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 642                         s->flags &= ~DEV_OPT_MTU;
 643         }
 644         if (s->flags & DEV_OPT_TXQUEUELEN) {
 645                 ifr.ifr_qlen = s->txqueuelen;
 646                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 647                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 648         }
 649         if (s->flags & DEV_OPT_MACADDR) {
 650                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 651                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 652                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 653                         s->flags &= ~DEV_OPT_MACADDR;
 654         }
 655 }
 656
 657 int system_if_up(struct device *dev)
 658 {
 659         system_if_get_settings(dev, &dev->orig_settings);
 660         system_if_apply_settings(dev, &dev->settings);
 661         dev->ifindex = system_if_resolve(dev);
 662         return system_if_flags(dev->ifname, IFF_UP, 0);
 663 }
 664
 665 int system_if_down(struct device *dev)
 666 {
 667         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 668         dev->orig_settings.flags &= dev->settings.flags;
 669         system_if_apply_settings(dev, &dev->orig_settings);
 670         return ret;
 671 }
 672
 673 int system_if_check(struct device *dev)
 674 {
 675         device_set_present(dev, (system_if_resolve(dev) > 0));
 676         return 0;
 677 }
 678
 679 struct device *
 680 system_if_get_parent(struct device *dev)
 681 {
 682         char buf[64], *devname;
 683         int ifindex, iflink, len;
 684         FILE *f;
 685
 686         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 687         f = fopen(buf, "r");
 688         if (!f)
 689                 return NULL;
 690
 691         len = fread(buf, 1, sizeof(buf) - 1, f);
 692         fclose(f);
 693
 694         if (len <= 0)
 695                 return NULL;
 696
 697         buf[len] = 0;
 698         iflink = strtoul(buf, NULL, 0);
 699         ifindex = system_if_resolve(dev);
 700         if (!iflink || iflink == ifindex)
 701                 return NULL;
 702
 703         devname = if_indextoname(iflink, buf);
 704         if (!devname)
 705                 return NULL;
 706
 707         return device_get(devname, true);
 708 }
 709
 710 static bool
 711 read_string_file(int dir_fd, const char *file, char *buf, int len)
 712 {
 713         bool ret = false;
 714         char *c;
 715         int fd;
 716
 717         fd = openat(dir_fd, file, O_RDONLY);
 718         if (fd < 0)
 719                 return false;
 720
 721 retry:
 722         len = read(fd, buf, len - 1);
 723         if (len < 0) {
 724                 if (errno == EINTR)
 725                         goto retry;
 726         } else if (len > 0) {
 727                         buf[len] = 0;
 728
 729                         c = strchr(buf, '\n');
 730                         if (c)
 731                                 *c = 0;
 732
 733                         ret = true;
 734         }
 735
 736         close(fd);
 737
 738         return ret;
 739 }
 740
 741 static bool
 742 read_int_file(int dir_fd, const char *file, int *val)
 743 {
 744         char buf[64];
 745         bool ret = false;
 746
 747         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 748         if (ret)
 749                 *val = strtoul(buf, NULL, 0);
 750
 751         return ret;
 752 }
 753
 754 /* Assume advertised flags == supported flags */
 755 static const struct {
 756         uint32_t mask;
 757         const char *name;
 758 } ethtool_link_modes[] = {
 759         { ADVERTISED_10baseT_Half, "10H" },
 760         { ADVERTISED_10baseT_Full, "10F" },
 761         { ADVERTISED_100baseT_Half, "100H" },
 762         { ADVERTISED_100baseT_Full, "100F" },
 763         { ADVERTISED_1000baseT_Half, "1000H" },
 764         { ADVERTISED_1000baseT_Full, "1000F" },
 765 };
 766
 767 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 768 {
 769         int i;
 770         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 771                 if (mask & ethtool_link_modes[i].mask)
 772                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 773         }
 774 }
 775
 776 bool
 777 system_if_force_external(const char *ifname)
 778 {
 779         char buf[64];
 780         struct stat s;
 781
 782         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 783         return stat(buf, &s) == 0;
 784 }
 785
 786 int
 787 system_if_dump_info(struct device *dev, struct blob_buf *b)
 788 {
 789         struct ethtool_cmd ecmd;
 790         struct ifreq ifr;
 791         char buf[64], *s;
 792         void *c;
 793         int dir_fd, val = 0;
 794
 795         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 796         dir_fd = open(buf, O_DIRECTORY);
 797
 798         if (read_int_file(dir_fd, "carrier", &val))
 799                 blobmsg_add_u8(b, "link", !!val);
 800
 801         memset(&ecmd, 0, sizeof(ecmd));
 802         memset(&ifr, 0, sizeof(ifr));
 803         strcpy(ifr.ifr_name, dev->ifname);
 804         ifr.ifr_data = (caddr_t) &ecmd;
 805         ecmd.cmd = ETHTOOL_GSET;
 806
 807         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 808                 c = blobmsg_open_array(b, "link-advertising");
 809                 system_add_link_modes(b, ecmd.advertising);
 810                 blobmsg_close_array(b, c);
 811
 812                 c = blobmsg_open_array(b, "link-supported");
 813                 system_add_link_modes(b, ecmd.supported);
 814                 blobmsg_close_array(b, c);
 815
 816                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 817                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 818                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 819                 blobmsg_add_string_buffer(b);
 820         }
 821
 822         close(dir_fd);
 823         return 0;
 824 }
 825
 826 int
 827 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 828 {
 829         const char *const counters[] = {
 830                 "collisions",     "rx_frame_errors",   "tx_compressed",
 831                 "multicast",      "rx_length_errors",  "tx_dropped",
 832                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 833                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 834                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 835                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 836                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 837                 "rx_fifo_errors", "tx_carrier_errors",
 838         };
 839         char buf[64];
 840         int stats_dir;
 841         int i, val = 0;
 842
 843         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 844         stats_dir = open(buf, O_DIRECTORY);
 845         if (stats_dir < 0)
 846                 return -1;
 847
 848         for (i = 0; i < ARRAY_SIZE(counters); i++)
 849                 if (read_int_file(stats_dir, counters[i], &val))
 850                         blobmsg_add_u32(b, counters[i], val);
 851
 852         close(stats_dir);
 853         return 0;
 854 }
 855
 856 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 857 {
 858         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 859         int alen = v4 ? 4 : 16;
 860         struct ifaddrmsg ifa = {
 861                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 862                 .ifa_prefixlen = addr->mask,
 863                 .ifa_index = dev->ifindex,
 864         };
 865
 866         struct nl_msg *msg;
 867
 868         msg = nlmsg_alloc_simple(cmd, 0);
 869         if (!msg)
 870                 return -1;
 871
 872         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 873         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 874         if (v4) {
 875                 if (addr->broadcast)
 876                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 877                 if (addr->point_to_point)
 878                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 879         }
 880
 881         return system_rtnl_call(msg);
 882 }
 883
 884 int system_add_address(struct device *dev, struct device_addr *addr)
 885 {
 886         return system_addr(dev, addr, RTM_NEWADDR);
 887 }
 888
 889 int system_del_address(struct device *dev, struct device_addr *addr)
 890 {
 891         return system_addr(dev, addr, RTM_DELADDR);
 892 }
 893
 894 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 895 {
 896         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 897         bool have_gw;
 898         unsigned int flags = 0;
 899         int ifindex = dev->ifindex;
 900
 901         if (alen == 4)
 902                 have_gw = !!route->nexthop.in.s_addr;
 903         else
 904                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 905                         route->nexthop.in6.s6_addr32[1] ||
 906                         route->nexthop.in6.s6_addr32[2] ||
 907                         route->nexthop.in6.s6_addr32[3];
 908
 909         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 910                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 911
 912         struct rtmsg rtm = {
 913                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 914                 .rtm_dst_len = route->mask,
 915                 .rtm_table = RT_TABLE_MAIN,
 916                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_BOOT,
 917                 .rtm_scope = scope,
 918                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 919         };
 920         struct nl_msg *msg;
 921
 922         if (cmd == RTM_NEWROUTE)
 923                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 924
 925         msg = nlmsg_alloc_simple(cmd, flags);
 926         if (!msg)
 927                 return -1;
 928
 929         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 930
 931         if (route->mask)
 932                 nla_put(msg, RTA_DST, alen, &route->addr);
 933
 934         if (route->metric > 0)
 935                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
 936
 937         if (have_gw)
 938                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 939
 940         nla_put_u32(msg, RTA_OIF, ifindex);
 941
 942         return system_rtnl_call(msg);
 943 }
 944
 945 int system_add_route(struct device *dev, struct device_route *route)
 946 {
 947         return system_rt(dev, route, RTM_NEWROUTE);
 948 }
 949
 950 int system_del_route(struct device *dev, struct device_route *route)
 951 {
 952         return system_rt(dev, route, RTM_DELROUTE);
 953 }
 954
 955 int system_flush_routes(void)
 956 {
 957         const char *names[] = {
 958                 "/proc/sys/net/ipv4/route/flush",
 959                 "/proc/sys/net/ipv6/route/flush"
 960         };
 961         int fd, i;
 962
 963         for (i = 0; i < ARRAY_SIZE(names); i++) {
 964                 fd = open(names[i], O_WRONLY);
 965                 if (fd < 0)
 966                         continue;
 967
 968                 write(fd, "-1", 2);
 969                 close(fd);
 970         }
 971         return 0;
 972 }
 973
 974 time_t system_get_rtime(void)
 975 {
 976         struct timespec ts;
 977         struct timeval tv;
 978
 979         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
 980                 return ts.tv_sec;
 981
 982         if (gettimeofday(&tv, NULL) == 0)
 983                 return tv.tv_sec;
 984
 985         return 0;
 986 }
 987
 988 #ifndef IP_DF
 989 #define IP_DF       0x4000
 990 #endif
 991
 992 static void tunnel_parm_init(struct ip_tunnel_parm *p)
 993 {
 994         memset(p, 0, sizeof(*p));
 995         p->iph.version = 4;
 996         p->iph.ihl = 5;
 997         p->iph.frag_off = htons(IP_DF);
 998 }
 999
1000 static int tunnel_ioctl(const char *name, int cmd, void *p)
1001 {
1002         struct ifreq ifr;
1003
1004         memset(&ifr, 0, sizeof(ifr));
1005         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1006         ifr.ifr_ifru.ifru_data = p;
1007         return ioctl(sock_ioctl, cmd, &ifr);
1008 }
1009
1010 int system_del_ip_tunnel(const char *name)
1011 {
1012         struct ip_tunnel_parm p;
1013
1014         tunnel_parm_init(&p);
1015         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
1016 }
1017
1018 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1019 {
1020         if (!attr)
1021                 return 1;
1022
1023         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
1024 }
1025
1026
1027 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1028 {
1029         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1030         struct blob_attr *cur;
1031         struct ip_tunnel_parm p;
1032         const char *base, *str;
1033         bool is_sit;
1034
1035         system_del_ip_tunnel(name);
1036
1037         tunnel_parm_init(&p);
1038
1039         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1040                 blob_data(attr), blob_len(attr));
1041
1042         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1043                 return -EINVAL;
1044         str = blobmsg_data(cur);
1045         is_sit = !strcmp(str, "sit");
1046
1047         if (is_sit) {
1048                 p.iph.protocol = IPPROTO_IPV6;
1049                 base = "sit0";
1050         } else
1051                 return -EINVAL;
1052
1053         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1054                 return -EINVAL;
1055
1056         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1057                 return -EINVAL;
1058
1059         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1060                 unsigned int val = blobmsg_get_u32(cur);
1061
1062                 if (val > 255)
1063                         return -EINVAL;
1064
1065                 p.iph.ttl = val;
1066         }
1067
1068         strncpy(p.name, name, sizeof(p.name));
1069         if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
1070                 return -1;
1071
1072 #ifdef SIOCADD6RD
1073         cur = tb[TUNNEL_ATTR_6RD_PREFIX];
1074         if (cur && is_sit) {
1075                 unsigned int mask;
1076                 struct ip_tunnel_6rd p6;
1077
1078                 memset(&p6, 0, sizeof(p6));
1079
1080                 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1081                                         &p6.prefix, &mask) || mask > 128)
1082                         return -EINVAL;
1083                 p6.prefixlen = mask;
1084
1085                 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1086                         if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1087                                                 &p6.relay_prefix, &mask) || mask > 32)
1088                                 return -EINVAL;
1089                         p6.relay_prefixlen = mask;
1090                 }
1091
1092                 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1093                         system_del_ip_tunnel(name);
1094                         return -1;
1095                 }
1096         }
1097 #endif
1098
1099         return 0;
1100 }