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