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, device);
 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         if (add && system_if_force_external(dev->ifname))
 239                 return;
 240
 241         device_set_present(dev, add);
 242 }
 243
 244 static void
 245 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 246 {
 247         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 248         struct sockaddr_nl nla;
 249         unsigned char *buf = NULL;
 250         int size;
 251
 252         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 253                 if (nla.nl_pid == 0)
 254                         handle_hotplug_msg((char *) buf, size);
 255
 256                 free(buf);
 257         }
 258 }
 259
 260 static int system_rtnl_call(struct nl_msg *msg)
 261 {
 262         int ret;
 263
 264         ret = nl_send_auto_complete(sock_rtnl, msg);
 265         nlmsg_free(msg);
 266
 267         if (ret < 0)
 268                 return ret;
 269
 270         return nl_wait_for_ack(sock_rtnl);
 271 }
 272
 273 int system_bridge_delbr(struct device *bridge)
 274 {
 275         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 276 }
 277
 278 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 279 {
 280         struct ifreq ifr;
 281
 282         memset(&ifr, 0, sizeof(ifr));
 283         if (dev)
 284                 ifr.ifr_ifindex = dev->ifindex;
 285         else
 286                 ifr.ifr_data = data;
 287         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 288         return ioctl(sock_ioctl, cmd, &ifr);
 289 }
 290
 291 static bool system_is_bridge(const char *name, char *buf, int buflen)
 292 {
 293         struct stat st;
 294
 295         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 296         if (stat(buf, &st) < 0)
 297                 return false;
 298
 299         return true;
 300 }
 301
 302 static char *system_get_bridge(const char *name, char *buf, int buflen)
 303 {
 304         char *path;
 305         ssize_t len;
 306         glob_t gl;
 307
 308         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 309         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 310                 return NULL;
 311
 312         if (gl.gl_pathc == 0)
 313                 return NULL;
 314
 315         len = readlink(gl.gl_pathv[0], buf, buflen);
 316         if (len < 0)
 317                 return NULL;
 318
 319         buf[len] = 0;
 320         path = strrchr(buf, '/');
 321         if (!path)
 322                 return NULL;
 323
 324         return path + 1;
 325 }
 326
 327 int system_bridge_addif(struct device *bridge, struct device *dev)
 328 {
 329         char *oldbr;
 330
 331         system_set_disable_ipv6(dev, "1");
 332         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 333         if (oldbr && !strcmp(oldbr, bridge->ifname))
 334                 return 0;
 335
 336         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 337 }
 338
 339 int system_bridge_delif(struct device *bridge, struct device *dev)
 340 {
 341         system_set_disable_ipv6(dev, "0");
 342         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 343 }
 344
 345 static int system_if_resolve(struct device *dev)
 346 {
 347         struct ifreq ifr;
 348         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 349         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 350                 return ifr.ifr_ifindex;
 351         else
 352                 return 0;
 353 }
 354
 355 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 356 {
 357         struct ifreq ifr;
 358
 359         memset(&ifr, 0, sizeof(ifr));
 360         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 361         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 362         ifr.ifr_flags |= add;
 363         ifr.ifr_flags &= ~rem;
 364         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 365 }
 366
 367 struct clear_data {
 368         struct nl_msg *msg;
 369         struct device *dev;
 370         int type;
 371         int size;
 372         int af;
 373 };
 374
 375
 376 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 377 {
 378         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 379
 380         return ifa->ifa_index == ifindex;
 381 }
 382
 383 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 384 {
 385         struct nlattr *tb[__RTA_MAX];
 386
 387         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 388         if (!tb[RTA_OIF])
 389                 return false;
 390
 391         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 392 }
 393
 394 static int cb_clear_event(struct nl_msg *msg, void *arg)
 395 {
 396         struct clear_data *clr = arg;
 397         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 398         bool (*cb)(struct nlmsghdr *, int ifindex);
 399         int type;
 400
 401         switch(clr->type) {
 402         case RTM_GETADDR:
 403                 type = RTM_DELADDR;
 404                 if (hdr->nlmsg_type != RTM_NEWADDR)
 405                         return NL_SKIP;
 406
 407                 cb = check_ifaddr;
 408                 break;
 409         case RTM_GETROUTE:
 410                 type = RTM_DELROUTE;
 411                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 412                         return NL_SKIP;
 413
 414                 cb = check_route;
 415                 break;
 416         default:
 417                 return NL_SKIP;
 418         }
 419
 420         if (!cb(hdr, clr->dev->ifindex))
 421                 return NL_SKIP;
 422
 423         D(SYSTEM, "Remove %s from device %s\n",
 424           type == RTM_DELADDR ? "an address" : "a route",
 425           clr->dev->ifname);
 426         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 427         hdr = nlmsg_hdr(clr->msg);
 428         hdr->nlmsg_type = type;
 429         hdr->nlmsg_flags = NLM_F_REQUEST;
 430
 431         if (!nl_send_auto_complete(sock_rtnl, clr->msg))
 432                 nl_wait_for_ack(sock_rtnl);
 433
 434         return NL_SKIP;
 435 }
 436
 437 static int
 438 cb_finish_event(struct nl_msg *msg, void *arg)
 439 {
 440         int *pending = arg;
 441         *pending = 0;
 442         return NL_STOP;
 443 }
 444
 445 static int
 446 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 447 {
 448         int *pending = arg;
 449         *pending = err->error;
 450         return NL_STOP;
 451 }
 452
 453 static void
 454 system_if_clear_entries(struct device *dev, int type, int af)
 455 {
 456         struct clear_data clr;
 457         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 458         struct rtmsg rtm = {
 459                 .rtm_family = af,
 460                 .rtm_flags = RTM_F_CLONED,
 461         };
 462         int flags = NLM_F_DUMP;
 463         int pending = 1;
 464
 465         clr.af = af;
 466         clr.dev = dev;
 467         clr.type = type;
 468         switch (type) {
 469         case RTM_GETADDR:
 470                 clr.size = sizeof(struct rtgenmsg);
 471                 break;
 472         case RTM_GETROUTE:
 473                 clr.size = sizeof(struct rtmsg);
 474                 break;
 475         default:
 476                 return;
 477         }
 478
 479         if (!cb)
 480                 return;
 481
 482         clr.msg = nlmsg_alloc_simple(type, flags);
 483         if (!clr.msg)
 484                 goto out;
 485
 486         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 487         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 488         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 489         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 490
 491         nl_send_auto_complete(sock_rtnl, clr.msg);
 492         while (pending > 0)
 493                 nl_recvmsgs(sock_rtnl, cb);
 494
 495         nlmsg_free(clr.msg);
 496 out:
 497         nl_cb_put(cb);
 498 }
 499
 500 /*
 501  * Clear bridge (membership) state and bring down device
 502  */
 503 void system_if_clear_state(struct device *dev)
 504 {
 505         static char buf[256];
 506         char *bridge;
 507
 508         if (dev->external)
 509                 return;
 510
 511         dev->ifindex = system_if_resolve(dev);
 512         if (!dev->ifindex)
 513                 return;
 514
 515         system_if_flags(dev->ifname, 0, IFF_UP);
 516
 517         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 518                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 519                 system_bridge_delbr(dev);
 520                 return;
 521         }
 522
 523         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 524         if (bridge) {
 525                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 526                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 527         }
 528
 529         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 530         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 531         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 532         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 533         system_set_disable_ipv6(dev, "0");
 534 }
 535
 536 static inline unsigned long
 537 sec_to_jiffies(int val)
 538 {
 539         return (unsigned long) val * 100;
 540 }
 541
 542 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 543 {
 544         unsigned long args[4] = {};
 545
 546         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 547                 return -1;
 548
 549         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 550         args[1] = !!cfg->stp;
 551         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 552
 553         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 554         args[1] = sec_to_jiffies(cfg->forward_delay);
 555         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 556
 557         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 558                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 559
 560         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 561                 args[0] = BRCTL_SET_AGEING_TIME;
 562                 args[1] = sec_to_jiffies(cfg->ageing_time);
 563                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 564         }
 565
 566         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 567                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 568                 args[1] = sec_to_jiffies(cfg->hello_time);
 569                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 570         }
 571
 572         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 573                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 574                 args[1] = sec_to_jiffies(cfg->max_age);
 575                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 576         }
 577
 578         return 0;
 579 }
 580
 581 static int system_vlan(struct device *dev, int id)
 582 {
 583         struct vlan_ioctl_args ifr = {
 584                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 585                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 586         };
 587
 588         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 589
 590         if (id < 0) {
 591                 ifr.cmd = DEL_VLAN_CMD;
 592                 ifr.u.VID = 0;
 593         } else {
 594                 ifr.cmd = ADD_VLAN_CMD;
 595                 ifr.u.VID = id;
 596         }
 597         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 598         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 599 }
 600
 601 int system_vlan_add(struct device *dev, int id)
 602 {
 603         return system_vlan(dev, id);
 604 }
 605
 606 int system_vlan_del(struct device *dev)
 607 {
 608         return system_vlan(dev, -1);
 609 }
 610
 611 static void
 612 system_if_get_settings(struct device *dev, struct device_settings *s)
 613 {
 614         struct ifreq ifr;
 615
 616         memset(&ifr, 0, sizeof(ifr));
 617         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 618
 619         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 620                 s->mtu = ifr.ifr_mtu;
 621                 s->flags |= DEV_OPT_MTU;
 622         }
 623
 624         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 625                 s->txqueuelen = ifr.ifr_qlen;
 626                 s->flags |= DEV_OPT_TXQUEUELEN;
 627         }
 628
 629         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 630                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 631                 s->flags |= DEV_OPT_MACADDR;
 632         }
 633 }
 634
 635 static void
 636 system_if_apply_settings(struct device *dev, struct device_settings *s)
 637 {
 638         struct ifreq ifr;
 639
 640         memset(&ifr, 0, sizeof(ifr));
 641         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 642         if (s->flags & DEV_OPT_MTU) {
 643                 ifr.ifr_mtu = s->mtu;
 644                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 645                         s->flags &= ~DEV_OPT_MTU;
 646         }
 647         if (s->flags & DEV_OPT_TXQUEUELEN) {
 648                 ifr.ifr_qlen = s->txqueuelen;
 649                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 650                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 651         }
 652         if (s->flags & DEV_OPT_MACADDR) {
 653                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 654                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 655                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 656                         s->flags &= ~DEV_OPT_MACADDR;
 657         }
 658 }
 659
 660 int system_if_up(struct device *dev)
 661 {
 662         system_if_get_settings(dev, &dev->orig_settings);
 663         system_if_apply_settings(dev, &dev->settings);
 664         dev->ifindex = system_if_resolve(dev);
 665         return system_if_flags(dev->ifname, IFF_UP, 0);
 666 }
 667
 668 int system_if_down(struct device *dev)
 669 {
 670         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 671         dev->orig_settings.flags &= dev->settings.flags;
 672         system_if_apply_settings(dev, &dev->orig_settings);
 673         return ret;
 674 }
 675
 676 int system_if_check(struct device *dev)
 677 {
 678         device_set_present(dev, (system_if_resolve(dev) > 0));
 679         return 0;
 680 }
 681
 682 struct device *
 683 system_if_get_parent(struct device *dev)
 684 {
 685         char buf[64], *devname;
 686         int ifindex, iflink, len;
 687         FILE *f;
 688
 689         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
 690         f = fopen(buf, "r");
 691         if (!f)
 692                 return NULL;
 693
 694         len = fread(buf, 1, sizeof(buf) - 1, f);
 695         fclose(f);
 696
 697         if (len <= 0)
 698                 return NULL;
 699
 700         buf[len] = 0;
 701         iflink = strtoul(buf, NULL, 0);
 702         ifindex = system_if_resolve(dev);
 703         if (!iflink || iflink == ifindex)
 704                 return NULL;
 705
 706         devname = if_indextoname(iflink, buf);
 707         if (!devname)
 708                 return NULL;
 709
 710         return device_get(devname, true);
 711 }
 712
 713 static bool
 714 read_string_file(int dir_fd, const char *file, char *buf, int len)
 715 {
 716         bool ret = false;
 717         char *c;
 718         int fd;
 719
 720         fd = openat(dir_fd, file, O_RDONLY);
 721         if (fd < 0)
 722                 return false;
 723
 724 retry:
 725         len = read(fd, buf, len - 1);
 726         if (len < 0) {
 727                 if (errno == EINTR)
 728                         goto retry;
 729         } else if (len > 0) {
 730                         buf[len] = 0;
 731
 732                         c = strchr(buf, '\n');
 733                         if (c)
 734                                 *c = 0;
 735
 736                         ret = true;
 737         }
 738
 739         close(fd);
 740
 741         return ret;
 742 }
 743
 744 static bool
 745 read_int_file(int dir_fd, const char *file, int *val)
 746 {
 747         char buf[64];
 748         bool ret = false;
 749
 750         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
 751         if (ret)
 752                 *val = strtoul(buf, NULL, 0);
 753
 754         return ret;
 755 }
 756
 757 /* Assume advertised flags == supported flags */
 758 static const struct {
 759         uint32_t mask;
 760         const char *name;
 761 } ethtool_link_modes[] = {
 762         { ADVERTISED_10baseT_Half, "10H" },
 763         { ADVERTISED_10baseT_Full, "10F" },
 764         { ADVERTISED_100baseT_Half, "100H" },
 765         { ADVERTISED_100baseT_Full, "100F" },
 766         { ADVERTISED_1000baseT_Half, "1000H" },
 767         { ADVERTISED_1000baseT_Full, "1000F" },
 768 };
 769
 770 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
 771 {
 772         int i;
 773         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
 774                 if (mask & ethtool_link_modes[i].mask)
 775                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
 776         }
 777 }
 778
 779 bool
 780 system_if_force_external(const char *ifname)
 781 {
 782         char buf[64];
 783         struct stat s;
 784
 785         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
 786         return stat(buf, &s) == 0;
 787 }
 788
 789 int
 790 system_if_dump_info(struct device *dev, struct blob_buf *b)
 791 {
 792         struct ethtool_cmd ecmd;
 793         struct ifreq ifr;
 794         char buf[64], *s;
 795         void *c;
 796         int dir_fd, val = 0;
 797
 798         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
 799         dir_fd = open(buf, O_DIRECTORY);
 800
 801         if (read_int_file(dir_fd, "carrier", &val))
 802                 blobmsg_add_u8(b, "link", !!val);
 803
 804         memset(&ecmd, 0, sizeof(ecmd));
 805         memset(&ifr, 0, sizeof(ifr));
 806         strcpy(ifr.ifr_name, dev->ifname);
 807         ifr.ifr_data = (caddr_t) &ecmd;
 808         ecmd.cmd = ETHTOOL_GSET;
 809
 810         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
 811                 c = blobmsg_open_array(b, "link-advertising");
 812                 system_add_link_modes(b, ecmd.advertising);
 813                 blobmsg_close_array(b, c);
 814
 815                 c = blobmsg_open_array(b, "link-supported");
 816                 system_add_link_modes(b, ecmd.supported);
 817                 blobmsg_close_array(b, c);
 818
 819                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
 820                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
 821                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
 822                 blobmsg_add_string_buffer(b);
 823         }
 824
 825         close(dir_fd);
 826         return 0;
 827 }
 828
 829 int
 830 system_if_dump_stats(struct device *dev, struct blob_buf *b)
 831 {
 832         const char *const counters[] = {
 833                 "collisions",     "rx_frame_errors",   "tx_compressed",
 834                 "multicast",      "rx_length_errors",  "tx_dropped",
 835                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
 836                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
 837                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
 838                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
 839                 "rx_errors",      "tx_bytes",          "tx_window_errors",
 840                 "rx_fifo_errors", "tx_carrier_errors",
 841         };
 842         char buf[64];
 843         int stats_dir;
 844         int i, val = 0;
 845
 846         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
 847         stats_dir = open(buf, O_DIRECTORY);
 848         if (stats_dir < 0)
 849                 return -1;
 850
 851         for (i = 0; i < ARRAY_SIZE(counters); i++)
 852                 if (read_int_file(stats_dir, counters[i], &val))
 853                         blobmsg_add_u32(b, counters[i], val);
 854
 855         close(stats_dir);
 856         return 0;
 857 }
 858
 859 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
 860 {
 861         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
 862         int alen = v4 ? 4 : 16;
 863         struct ifaddrmsg ifa = {
 864                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
 865                 .ifa_prefixlen = addr->mask,
 866                 .ifa_index = dev->ifindex,
 867         };
 868
 869         struct nl_msg *msg;
 870
 871         msg = nlmsg_alloc_simple(cmd, 0);
 872         if (!msg)
 873                 return -1;
 874
 875         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
 876         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
 877         if (v4) {
 878                 if (addr->broadcast)
 879                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
 880                 if (addr->point_to_point)
 881                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
 882         }
 883
 884         return system_rtnl_call(msg);
 885 }
 886
 887 int system_add_address(struct device *dev, struct device_addr *addr)
 888 {
 889         return system_addr(dev, addr, RTM_NEWADDR);
 890 }
 891
 892 int system_del_address(struct device *dev, struct device_addr *addr)
 893 {
 894         return system_addr(dev, addr, RTM_DELADDR);
 895 }
 896
 897 static int system_rt(struct device *dev, struct device_route *route, int cmd)
 898 {
 899         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
 900         bool have_gw;
 901         unsigned int flags = 0;
 902         int ifindex = dev->ifindex;
 903
 904         if (alen == 4)
 905                 have_gw = !!route->nexthop.in.s_addr;
 906         else
 907                 have_gw = route->nexthop.in6.s6_addr32[0] ||
 908                         route->nexthop.in6.s6_addr32[1] ||
 909                         route->nexthop.in6.s6_addr32[2] ||
 910                         route->nexthop.in6.s6_addr32[3];
 911
 912         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
 913                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
 914
 915         struct rtmsg rtm = {
 916                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
 917                 .rtm_dst_len = route->mask,
 918                 .rtm_table = RT_TABLE_MAIN,
 919                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_BOOT,
 920                 .rtm_scope = scope,
 921                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
 922         };
 923         struct nl_msg *msg;
 924
 925         if (cmd == RTM_NEWROUTE)
 926                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
 927
 928         msg = nlmsg_alloc_simple(cmd, flags);
 929         if (!msg)
 930                 return -1;
 931
 932         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
 933
 934         if (route->mask)
 935                 nla_put(msg, RTA_DST, alen, &route->addr);
 936
 937         if (route->metric > 0)
 938                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
 939
 940         if (have_gw)
 941                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
 942
 943         nla_put_u32(msg, RTA_OIF, ifindex);
 944
 945         return system_rtnl_call(msg);
 946 }
 947
 948 int system_add_route(struct device *dev, struct device_route *route)
 949 {
 950         return system_rt(dev, route, RTM_NEWROUTE);
 951 }
 952
 953 int system_del_route(struct device *dev, struct device_route *route)
 954 {
 955         return system_rt(dev, route, RTM_DELROUTE);
 956 }
 957
 958 int system_flush_routes(void)
 959 {
 960         const char *names[] = {
 961                 "/proc/sys/net/ipv4/route/flush",
 962                 "/proc/sys/net/ipv6/route/flush"
 963         };
 964         int fd, i;
 965
 966         for (i = 0; i < ARRAY_SIZE(names); i++) {
 967                 fd = open(names[i], O_WRONLY);
 968                 if (fd < 0)
 969                         continue;
 970
 971                 write(fd, "-1", 2);
 972                 close(fd);
 973         }
 974         return 0;
 975 }
 976
 977 time_t system_get_rtime(void)
 978 {
 979         struct timespec ts;
 980         struct timeval tv;
 981
 982         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
 983                 return ts.tv_sec;
 984
 985         if (gettimeofday(&tv, NULL) == 0)
 986                 return tv.tv_sec;
 987
 988         return 0;
 989 }
 990
 991 #ifndef IP_DF
 992 #define IP_DF       0x4000
 993 #endif
 994
 995 static void tunnel_parm_init(struct ip_tunnel_parm *p)
 996 {
 997         memset(p, 0, sizeof(*p));
 998         p->iph.version = 4;
 999         p->iph.ihl = 5;
1000         p->iph.frag_off = htons(IP_DF);
1001 }
1002
1003 static int tunnel_ioctl(const char *name, int cmd, void *p)
1004 {
1005         struct ifreq ifr;
1006
1007         memset(&ifr, 0, sizeof(ifr));
1008         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1009         ifr.ifr_ifru.ifru_data = p;
1010         return ioctl(sock_ioctl, cmd, &ifr);
1011 }
1012
1013 int system_del_ip_tunnel(const char *name)
1014 {
1015         struct ip_tunnel_parm p;
1016
1017         tunnel_parm_init(&p);
1018         return tunnel_ioctl(name, SIOCDELTUNNEL, &p);
1019 }
1020
1021 static int parse_ipaddr(struct blob_attr *attr, __be32 *addr)
1022 {
1023         if (!attr)
1024                 return 1;
1025
1026         return inet_pton(AF_INET, blobmsg_data(attr), (void *) addr);
1027 }
1028
1029
1030 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1031 {
1032         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1033         struct blob_attr *cur;
1034         struct ip_tunnel_parm p;
1035         const char *base, *str;
1036         bool is_sit;
1037
1038         system_del_ip_tunnel(name);
1039
1040         tunnel_parm_init(&p);
1041
1042         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1043                 blob_data(attr), blob_len(attr));
1044
1045         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1046                 return -EINVAL;
1047         str = blobmsg_data(cur);
1048         is_sit = !strcmp(str, "sit");
1049
1050         if (is_sit) {
1051                 p.iph.protocol = IPPROTO_IPV6;
1052                 base = "sit0";
1053         } else
1054                 return -EINVAL;
1055
1056         if (!parse_ipaddr(tb[TUNNEL_ATTR_LOCAL], &p.iph.saddr))
1057                 return -EINVAL;
1058
1059         if (!parse_ipaddr(tb[TUNNEL_ATTR_REMOTE], &p.iph.daddr))
1060                 return -EINVAL;
1061
1062         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1063                 unsigned int val = blobmsg_get_u32(cur);
1064
1065                 if (val > 255)
1066                         return -EINVAL;
1067
1068                 p.iph.ttl = val;
1069         }
1070
1071         strncpy(p.name, name, sizeof(p.name));
1072         if (tunnel_ioctl(base, SIOCADDTUNNEL, &p) < 0)
1073                 return -1;
1074
1075 #ifdef SIOCADD6RD
1076         cur = tb[TUNNEL_ATTR_6RD_PREFIX];
1077         if (cur && is_sit) {
1078                 unsigned int mask;
1079                 struct ip_tunnel_6rd p6;
1080
1081                 memset(&p6, 0, sizeof(p6));
1082
1083                 if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1084                                         &p6.prefix, &mask) || mask > 128)
1085                         return -EINVAL;
1086                 p6.prefixlen = mask;
1087
1088                 if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1089                         if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1090                                                 &p6.relay_prefix, &mask) || mask > 32)
1091                                 return -EINVAL;
1092                         p6.relay_prefixlen = mask;
1093                 }
1094
1095                 if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1096                         system_del_ip_tunnel(name);
1097                         return -1;
1098                 }
1099         }
1100 #endif
1101
1102         return 0;
1103 }