system-linux.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  * Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  * Copyright (C) 2013 Steven Barth <steven@midlink.org>
   6  * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2
  10  * as published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17 #define _GNU_SOURCE
  18
  19 #include <sys/socket.h>
  20 #include <sys/ioctl.h>
  21 #include <sys/stat.h>
  22 #include <sys/syscall.h>
  23
  24 #include <net/if.h>
  25 #include <net/if_arp.h>
  26
  27 #include <arpa/inet.h>
  28 #include <netinet/in.h>
  29
  30 #include <linux/rtnetlink.h>
  31 #include <linux/sockios.h>
  32 #include <linux/ip.h>
  33 #include <linux/if_link.h>
  34 #include <linux/if_vlan.h>
  35 #include <linux/if_bridge.h>
  36 #include <linux/if_tunnel.h>
  37 #include <linux/ip6_tunnel.h>
  38 #include <linux/ethtool.h>
  39 #include <linux/fib_rules.h>
  40 #include <linux/version.h>
  41
  42 #ifndef RTN_FAILED_POLICY
  43 #define RTN_FAILED_POLICY 12
  44 #endif
  45
  46 #include <string.h>
  47 #include <fcntl.h>
  48 #include <glob.h>
  49 #include <time.h>
  50
  51 #include <netlink/msg.h>
  52 #include <netlink/attr.h>
  53 #include <netlink/socket.h>
  54 #include <libubox/uloop.h>
  55
  56 #include "netifd.h"
  57 #include "device.h"
  58 #include "system.h"
  59
  60 struct event_socket {
  61         struct uloop_fd uloop;
  62         struct nl_sock *sock;
  63         int bufsize;
  64 };
  65
  66 static int sock_ioctl = -1;
  67 static struct nl_sock *sock_rtnl = NULL;
  68
  69 static int cb_rtnl_event(struct nl_msg *msg, void *arg);
  70 static void handle_hotplug_event(struct uloop_fd *u, unsigned int events);
  71
  72 static char dev_buf[256];
  73
  74 static void
  75 handler_nl_event(struct uloop_fd *u, unsigned int events)
  76 {
  77         struct event_socket *ev = container_of(u, struct event_socket, uloop);
  78         int err;
  79         socklen_t errlen = sizeof(err);
  80
  81         if (!u->error) {
  82                 nl_recvmsgs_default(ev->sock);
  83                 return;
  84         }
  85
  86         if (getsockopt(u->fd, SOL_SOCKET, SO_ERROR, (void *)&err, &errlen))
  87                 goto abort;
  88
  89         switch(err) {
  90         case ENOBUFS:
  91                 // Increase rx buffer size on netlink socket
  92                 ev->bufsize *= 2;
  93                 if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
  94                         goto abort;
  95
  96                 // Request full dump since some info got dropped
  97                 struct rtgenmsg msg = { .rtgen_family = AF_UNSPEC };
  98                 nl_send_simple(ev->sock, RTM_GETLINK, NLM_F_DUMP, &msg, sizeof(msg));
  99                 break;
 100
 101         default:
 102                 goto abort;
 103         }
 104         u->error = false;
 105         return;
 106
 107 abort:
 108         uloop_fd_delete(&ev->uloop);
 109         return;
 110 }
 111
 112 static struct nl_sock *
 113 create_socket(int protocol, int groups)
 114 {
 115         struct nl_sock *sock;
 116
 117         sock = nl_socket_alloc();
 118         if (!sock)
 119                 return NULL;
 120
 121         if (groups)
 122                 nl_join_groups(sock, groups);
 123
 124         if (nl_connect(sock, protocol))
 125                 return NULL;
 126
 127         return sock;
 128 }
 129
 130 static bool
 131 create_raw_event_socket(struct event_socket *ev, int protocol, int groups,
 132                         uloop_fd_handler cb, int flags)
 133 {
 134         ev->sock = create_socket(protocol, groups);
 135         if (!ev->sock)
 136                 return false;
 137
 138         ev->uloop.fd = nl_socket_get_fd(ev->sock);
 139         ev->uloop.cb = cb;
 140         if (uloop_fd_add(&ev->uloop, ULOOP_READ|flags))
 141                 return false;
 142
 143         return true;
 144 }
 145
 146 static bool
 147 create_event_socket(struct event_socket *ev, int protocol,
 148                     int (*cb)(struct nl_msg *msg, void *arg))
 149 {
 150         if (!create_raw_event_socket(ev, protocol, 0, handler_nl_event, ULOOP_ERROR_CB))
 151                 return false;
 152
 153         // Install the valid custom callback handler
 154         nl_socket_modify_cb(ev->sock, NL_CB_VALID, NL_CB_CUSTOM, cb, NULL);
 155
 156         // Disable sequence number checking on event sockets
 157         nl_socket_disable_seq_check(ev->sock);
 158
 159         // Increase rx buffer size to 65K on event sockets
 160         ev->bufsize = 65535;
 161         if (nl_socket_set_buffer_size(ev->sock, ev->bufsize, 0))
 162                 return false;
 163
 164         return true;
 165 }
 166
 167 int system_init(void)
 168 {
 169         static struct event_socket rtnl_event;
 170         static struct event_socket hotplug_event;
 171
 172         sock_ioctl = socket(AF_LOCAL, SOCK_DGRAM, 0);
 173         system_fd_set_cloexec(sock_ioctl);
 174
 175         // Prepare socket for routing / address control
 176         sock_rtnl = create_socket(NETLINK_ROUTE, 0);
 177         if (!sock_rtnl)
 178                 return -1;
 179
 180         if (!create_event_socket(&rtnl_event, NETLINK_ROUTE, cb_rtnl_event))
 181                 return -1;
 182
 183         if (!create_raw_event_socket(&hotplug_event, NETLINK_KOBJECT_UEVENT, 1,
 184                                      handle_hotplug_event, 0))
 185                 return -1;
 186
 187         // Receive network link events form kernel
 188         nl_socket_add_membership(rtnl_event.sock, RTNLGRP_LINK);
 189
 190         return 0;
 191 }
 192
 193 static void system_set_sysctl(const char *path, const char *val)
 194 {
 195         int fd;
 196
 197         fd = open(path, O_WRONLY);
 198         if (fd < 0)
 199                 return;
 200
 201         if (write(fd, val, strlen(val))) {}
 202         close(fd);
 203 }
 204
 205 static void system_set_dev_sysctl(const char *path, const char *device, const char *val)
 206 {
 207         snprintf(dev_buf, sizeof(dev_buf), path, device);
 208         system_set_sysctl(dev_buf, val);
 209 }
 210
 211 static void system_set_disable_ipv6(struct device *dev, const char *val)
 212 {
 213         system_set_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6", dev->ifname, val);
 214 }
 215
 216 static int system_get_sysctl(const char *path, char *buf, const size_t buf_sz)
 217 {
 218         int fd = -1, ret = -1;
 219
 220         fd = open(path, O_RDONLY);
 221         if (fd < 0)
 222                 goto out;
 223
 224         ssize_t len = read(fd, buf, buf_sz - 1);
 225         if (len < 0)
 226                 goto out;
 227
 228         ret = buf[len] = 0;
 229
 230 out:
 231         if (fd >= 0)
 232                 close(fd);
 233
 234         return ret;
 235 }
 236
 237 static int
 238 system_get_dev_sysctl(const char *path, const char *device, char *buf, const size_t buf_sz)
 239 {
 240         snprintf(dev_buf, sizeof(dev_buf), path, device);
 241         return system_get_sysctl(dev_buf, buf, buf_sz);
 242 }
 243
 244 static int system_get_disable_ipv6(struct device *dev, char *buf, const size_t buf_sz)
 245 {
 246         return system_get_dev_sysctl("/proc/sys/net/ipv6/conf/%s/disable_ipv6",
 247                         dev->ifname, buf, buf_sz);
 248 }
 249
 250 #ifndef IFF_LOWER_UP
 251 #define IFF_LOWER_UP    0x10000
 252 #endif
 253
 254 // Evaluate netlink messages
 255 static int cb_rtnl_event(struct nl_msg *msg, void *arg)
 256 {
 257         struct nlmsghdr *nh = nlmsg_hdr(msg);
 258         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 259         struct nlattr *nla[__IFLA_MAX];
 260
 261         if (nh->nlmsg_type != RTM_NEWLINK)
 262                 goto out;
 263
 264         nlmsg_parse(nh, sizeof(*ifi), nla, __IFLA_MAX - 1, NULL);
 265         if (!nla[IFLA_IFNAME])
 266                 goto out;
 267
 268         struct device *dev = device_get(nla_data(nla[IFLA_IFNAME]), false);
 269         if (!dev)
 270                 goto out;
 271
 272         device_set_ifindex(dev, ifi->ifi_index);
 273         device_set_link(dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
 274
 275 out:
 276         return 0;
 277 }
 278
 279 static void
 280 handle_hotplug_msg(char *data, int size)
 281 {
 282         const char *subsystem = NULL, *interface = NULL;
 283         char *cur, *end, *sep;
 284         struct device *dev;
 285         int skip;
 286         bool add;
 287
 288         if (!strncmp(data, "add@", 4))
 289                 add = true;
 290         else if (!strncmp(data, "remove@", 7))
 291                 add = false;
 292         else
 293                 return;
 294
 295         skip = strlen(data) + 1;
 296         end = data + size;
 297
 298         for (cur = data + skip; cur < end; cur += skip) {
 299                 skip = strlen(cur) + 1;
 300
 301                 sep = strchr(cur, '=');
 302                 if (!sep)
 303                         continue;
 304
 305                 *sep = 0;
 306                 if (!strcmp(cur, "INTERFACE"))
 307                         interface = sep + 1;
 308                 else if (!strcmp(cur, "SUBSYSTEM")) {
 309                         subsystem = sep + 1;
 310                         if (strcmp(subsystem, "net") != 0)
 311                                 return;
 312                 }
 313                 if (subsystem && interface)
 314                         goto found;
 315         }
 316         return;
 317
 318 found:
 319         dev = device_get(interface, false);
 320         if (!dev)
 321                 return;
 322
 323         if (dev->type != &simple_device_type)
 324                 return;
 325
 326         if (add && system_if_force_external(dev->ifname))
 327                 return;
 328
 329         device_set_present(dev, add);
 330 }
 331
 332 static void
 333 handle_hotplug_event(struct uloop_fd *u, unsigned int events)
 334 {
 335         struct event_socket *ev = container_of(u, struct event_socket, uloop);
 336         struct sockaddr_nl nla;
 337         unsigned char *buf = NULL;
 338         int size;
 339
 340         while ((size = nl_recv(ev->sock, &nla, &buf, NULL)) > 0) {
 341                 if (nla.nl_pid == 0)
 342                         handle_hotplug_msg((char *) buf, size);
 343
 344                 free(buf);
 345         }
 346 }
 347
 348 static int system_rtnl_call(struct nl_msg *msg)
 349 {
 350         int ret;
 351
 352         ret = nl_send_auto_complete(sock_rtnl, msg);
 353         nlmsg_free(msg);
 354
 355         if (ret < 0)
 356                 return ret;
 357
 358         return nl_wait_for_ack(sock_rtnl);
 359 }
 360
 361 int system_bridge_delbr(struct device *bridge)
 362 {
 363         return ioctl(sock_ioctl, SIOCBRDELBR, bridge->ifname);
 364 }
 365
 366 static int system_bridge_if(const char *bridge, struct device *dev, int cmd, void *data)
 367 {
 368         struct ifreq ifr;
 369
 370         memset(&ifr, 0, sizeof(ifr));
 371         if (dev)
 372                 ifr.ifr_ifindex = dev->ifindex;
 373         else
 374                 ifr.ifr_data = data;
 375         strncpy(ifr.ifr_name, bridge, sizeof(ifr.ifr_name));
 376         return ioctl(sock_ioctl, cmd, &ifr);
 377 }
 378
 379 static bool system_is_bridge(const char *name, char *buf, int buflen)
 380 {
 381         struct stat st;
 382
 383         snprintf(buf, buflen, "/sys/devices/virtual/net/%s/bridge", name);
 384         if (stat(buf, &st) < 0)
 385                 return false;
 386
 387         return true;
 388 }
 389
 390 static char *system_get_bridge(const char *name, char *buf, int buflen)
 391 {
 392         char *path;
 393         ssize_t len;
 394         glob_t gl;
 395
 396         snprintf(buf, buflen, "/sys/devices/virtual/net/*/brif/%s/bridge", name);
 397         if (glob(buf, GLOB_NOSORT, NULL, &gl) < 0)
 398                 return NULL;
 399
 400         if (gl.gl_pathc == 0)
 401                 return NULL;
 402
 403         len = readlink(gl.gl_pathv[0], buf, buflen);
 404         if (len < 0)
 405                 return NULL;
 406
 407         buf[len] = 0;
 408         path = strrchr(buf, '/');
 409         if (!path)
 410                 return NULL;
 411
 412         return path + 1;
 413 }
 414
 415 int system_bridge_addif(struct device *bridge, struct device *dev)
 416 {
 417         char *oldbr;
 418
 419         oldbr = system_get_bridge(dev->ifname, dev_buf, sizeof(dev_buf));
 420         if (oldbr && !strcmp(oldbr, bridge->ifname))
 421                 return 0;
 422
 423         return system_bridge_if(bridge->ifname, dev, SIOCBRADDIF, NULL);
 424 }
 425
 426 int system_bridge_delif(struct device *bridge, struct device *dev)
 427 {
 428         return system_bridge_if(bridge->ifname, dev, SIOCBRDELIF, NULL);
 429 }
 430
 431 static int system_if_resolve(struct device *dev)
 432 {
 433         struct ifreq ifr;
 434         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 435         if (!ioctl(sock_ioctl, SIOCGIFINDEX, &ifr))
 436                 return ifr.ifr_ifindex;
 437         else
 438                 return 0;
 439 }
 440
 441 static int system_if_flags(const char *ifname, unsigned add, unsigned rem)
 442 {
 443         struct ifreq ifr;
 444
 445         memset(&ifr, 0, sizeof(ifr));
 446         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 447         ioctl(sock_ioctl, SIOCGIFFLAGS, &ifr);
 448         ifr.ifr_flags |= add;
 449         ifr.ifr_flags &= ~rem;
 450         return ioctl(sock_ioctl, SIOCSIFFLAGS, &ifr);
 451 }
 452
 453 struct clear_data {
 454         struct nl_msg *msg;
 455         struct device *dev;
 456         int type;
 457         int size;
 458         int af;
 459 };
 460
 461
 462 static bool check_ifaddr(struct nlmsghdr *hdr, int ifindex)
 463 {
 464         struct ifaddrmsg *ifa = NLMSG_DATA(hdr);
 465
 466         return ifa->ifa_index == ifindex;
 467 }
 468
 469 static bool check_route(struct nlmsghdr *hdr, int ifindex)
 470 {
 471         struct rtmsg *r = NLMSG_DATA(hdr);
 472         struct nlattr *tb[__RTA_MAX];
 473
 474         if (r->rtm_protocol == RTPROT_KERNEL &&
 475             r->rtm_family == AF_INET6)
 476                 return false;
 477
 478         nlmsg_parse(hdr, sizeof(struct rtmsg), tb, __RTA_MAX - 1, NULL);
 479         if (!tb[RTA_OIF])
 480                 return false;
 481
 482         return *(int *)RTA_DATA(tb[RTA_OIF]) == ifindex;
 483 }
 484
 485 static bool check_rule(struct nlmsghdr *hdr, int ifindex)
 486 {
 487         return true;
 488 }
 489
 490 static int cb_clear_event(struct nl_msg *msg, void *arg)
 491 {
 492         struct clear_data *clr = arg;
 493         struct nlmsghdr *hdr = nlmsg_hdr(msg);
 494         bool (*cb)(struct nlmsghdr *, int ifindex);
 495         int type;
 496
 497         switch(clr->type) {
 498         case RTM_GETADDR:
 499                 type = RTM_DELADDR;
 500                 if (hdr->nlmsg_type != RTM_NEWADDR)
 501                         return NL_SKIP;
 502
 503                 cb = check_ifaddr;
 504                 break;
 505         case RTM_GETROUTE:
 506                 type = RTM_DELROUTE;
 507                 if (hdr->nlmsg_type != RTM_NEWROUTE)
 508                         return NL_SKIP;
 509
 510                 cb = check_route;
 511                 break;
 512         case RTM_GETRULE:
 513                 type = RTM_DELRULE;
 514                 if (hdr->nlmsg_type != RTM_NEWRULE)
 515                         return NL_SKIP;
 516
 517                 cb = check_rule;
 518                 break;
 519         default:
 520                 return NL_SKIP;
 521         }
 522
 523         if (!cb(hdr, clr->dev ? clr->dev->ifindex : 0))
 524                 return NL_SKIP;
 525
 526         if (type == RTM_DELRULE)
 527                 D(SYSTEM, "Remove a rule\n");
 528         else
 529                 D(SYSTEM, "Remove %s from device %s\n",
 530                   type == RTM_DELADDR ? "an address" : "a route",
 531                   clr->dev->ifname);
 532         memcpy(nlmsg_hdr(clr->msg), hdr, hdr->nlmsg_len);
 533         hdr = nlmsg_hdr(clr->msg);
 534         hdr->nlmsg_type = type;
 535         hdr->nlmsg_flags = NLM_F_REQUEST;
 536
 537         nl_socket_disable_auto_ack(sock_rtnl);
 538         nl_send_auto_complete(sock_rtnl, clr->msg);
 539         nl_socket_enable_auto_ack(sock_rtnl);
 540
 541         return NL_SKIP;
 542 }
 543
 544 static int
 545 cb_finish_event(struct nl_msg *msg, void *arg)
 546 {
 547         int *pending = arg;
 548         *pending = 0;
 549         return NL_STOP;
 550 }
 551
 552 static int
 553 error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 554 {
 555         int *pending = arg;
 556         *pending = err->error;
 557         return NL_STOP;
 558 }
 559
 560 static void
 561 system_if_clear_entries(struct device *dev, int type, int af)
 562 {
 563         struct clear_data clr;
 564         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
 565         struct rtmsg rtm = {
 566                 .rtm_family = af,
 567                 .rtm_flags = RTM_F_CLONED,
 568         };
 569         int flags = NLM_F_DUMP;
 570         int pending = 1;
 571
 572         clr.af = af;
 573         clr.dev = dev;
 574         clr.type = type;
 575         switch (type) {
 576         case RTM_GETADDR:
 577         case RTM_GETRULE:
 578                 clr.size = sizeof(struct rtgenmsg);
 579                 break;
 580         case RTM_GETROUTE:
 581                 clr.size = sizeof(struct rtmsg);
 582                 break;
 583         default:
 584                 return;
 585         }
 586
 587         if (!cb)
 588                 return;
 589
 590         clr.msg = nlmsg_alloc_simple(type, flags);
 591         if (!clr.msg)
 592                 goto out;
 593
 594         nlmsg_append(clr.msg, &rtm, clr.size, 0);
 595         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_clear_event, &clr);
 596         nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_event, &pending);
 597         nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &pending);
 598
 599         nl_send_auto_complete(sock_rtnl, clr.msg);
 600         while (pending > 0)
 601                 nl_recvmsgs(sock_rtnl, cb);
 602
 603         nlmsg_free(clr.msg);
 604 out:
 605         nl_cb_put(cb);
 606 }
 607
 608 /*
 609  * Clear bridge (membership) state and bring down device
 610  */
 611 void system_if_clear_state(struct device *dev)
 612 {
 613         static char buf[256];
 614         char *bridge;
 615
 616         device_set_ifindex(dev, system_if_resolve(dev));
 617         if (dev->external || !dev->ifindex)
 618                 return;
 619
 620         system_if_flags(dev->ifname, 0, IFF_UP);
 621
 622         if (system_is_bridge(dev->ifname, buf, sizeof(buf))) {
 623                 D(SYSTEM, "Delete existing bridge named '%s'\n", dev->ifname);
 624                 system_bridge_delbr(dev);
 625                 return;
 626         }
 627
 628         bridge = system_get_bridge(dev->ifname, buf, sizeof(buf));
 629         if (bridge) {
 630                 D(SYSTEM, "Remove device '%s' from bridge '%s'\n", dev->ifname, bridge);
 631                 system_bridge_if(bridge, dev, SIOCBRDELIF, NULL);
 632         }
 633
 634         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET);
 635         system_if_clear_entries(dev, RTM_GETADDR, AF_INET);
 636         system_if_clear_entries(dev, RTM_GETROUTE, AF_INET6);
 637         system_if_clear_entries(dev, RTM_GETADDR, AF_INET6);
 638         system_set_disable_ipv6(dev, "0");
 639 }
 640
 641 static inline unsigned long
 642 sec_to_jiffies(int val)
 643 {
 644         return (unsigned long) val * 100;
 645 }
 646
 647 int system_bridge_addbr(struct device *bridge, struct bridge_config *cfg)
 648 {
 649         unsigned long args[4] = {};
 650
 651         if (ioctl(sock_ioctl, SIOCBRADDBR, bridge->ifname) < 0)
 652                 return -1;
 653
 654         args[0] = BRCTL_SET_BRIDGE_STP_STATE;
 655         args[1] = !!cfg->stp;
 656         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 657
 658         args[0] = BRCTL_SET_BRIDGE_FORWARD_DELAY;
 659         args[1] = sec_to_jiffies(cfg->forward_delay);
 660         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 661
 662         system_set_dev_sysctl("/sys/devices/virtual/net/%s/bridge/multicast_snooping",
 663                 bridge->ifname, cfg->igmp_snoop ? "1" : "0");
 664
 665         args[0] = BRCTL_SET_BRIDGE_PRIORITY;
 666         args[1] = cfg->priority;
 667         system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 668
 669         if (cfg->flags & BRIDGE_OPT_AGEING_TIME) {
 670                 args[0] = BRCTL_SET_AGEING_TIME;
 671                 args[1] = sec_to_jiffies(cfg->ageing_time);
 672                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 673         }
 674
 675         if (cfg->flags & BRIDGE_OPT_HELLO_TIME) {
 676                 args[0] = BRCTL_SET_BRIDGE_HELLO_TIME;
 677                 args[1] = sec_to_jiffies(cfg->hello_time);
 678                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 679         }
 680
 681         if (cfg->flags & BRIDGE_OPT_MAX_AGE) {
 682                 args[0] = BRCTL_SET_BRIDGE_MAX_AGE;
 683                 args[1] = sec_to_jiffies(cfg->max_age);
 684                 system_bridge_if(bridge->ifname, NULL, SIOCDEVPRIVATE, &args);
 685         }
 686
 687         return 0;
 688 }
 689
 690 int system_macvlan_add(struct device *macvlan, struct device *dev, struct macvlan_config *cfg)
 691 {
 692         struct nl_msg *msg;
 693         struct nlattr *linkinfo, *data;
 694         struct ifinfomsg iim = { .ifi_family = AF_INET };
 695         int ifindex = system_if_resolve(dev);
 696         int i, rv;
 697         static const struct {
 698                 const char *name;
 699                 enum macvlan_mode val;
 700         } modes[] = {
 701                 { "private", MACVLAN_MODE_PRIVATE },
 702                 { "vepa", MACVLAN_MODE_VEPA },
 703                 { "bridge", MACVLAN_MODE_BRIDGE },
 704                 { "passthru", MACVLAN_MODE_PASSTHRU },
 705         };
 706
 707         if (ifindex == 0)
 708                 return -ENOENT;
 709
 710         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 711
 712         if (!msg)
 713                 return -1;
 714
 715         nlmsg_append(msg, &iim, sizeof(iim), 0);
 716
 717         if (cfg->flags & MACVLAN_OPT_MACADDR)
 718                 nla_put(msg, IFLA_ADDRESS, sizeof(cfg->macaddr), cfg->macaddr);
 719         nla_put(msg, IFLA_IFNAME, IFNAMSIZ, macvlan->ifname);
 720         nla_put_u32(msg, IFLA_LINK, ifindex);
 721
 722         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 723                 goto nla_put_failure;
 724
 725         nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
 726
 727         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 728                 goto nla_put_failure;
 729
 730         if (cfg->mode) {
 731                 for (i = 0; i < ARRAY_SIZE(modes); i++) {
 732                         if (strcmp(cfg->mode, modes[i].name) != 0)
 733                                 continue;
 734
 735                         nla_put_u32(msg, IFLA_MACVLAN_MODE, modes[i].val);
 736                         break;
 737                 }
 738         }
 739
 740         nla_nest_end(msg, data);
 741         nla_nest_end(msg, linkinfo);
 742
 743         rv = system_rtnl_call(msg);
 744         if (rv)
 745                 D(SYSTEM, "Error adding macvlan '%s' over '%s': %d\n", macvlan->ifname, dev->ifname, rv);
 746
 747         return rv;
 748
 749 nla_put_failure:
 750         nlmsg_free(msg);
 751         return -ENOMEM;
 752 }
 753
 754 int system_macvlan_del(struct device *macvlan)
 755 {
 756         struct nl_msg *msg;
 757         struct ifinfomsg iim;
 758
 759         iim.ifi_family = AF_INET;
 760         iim.ifi_index  = 0;
 761
 762         msg = nlmsg_alloc_simple(RTM_DELLINK, 0);
 763
 764         if (!msg)
 765                 return -1;
 766
 767         nlmsg_append(msg, &iim, sizeof(iim), 0);
 768
 769         nla_put(msg, IFLA_INFO_KIND, strlen("macvlan"), "macvlan");
 770         nla_put(msg, IFLA_IFNAME, sizeof(macvlan->ifname), macvlan->ifname);
 771
 772         system_rtnl_call(msg);
 773
 774         return 0;
 775 }
 776
 777 static int system_vlan(struct device *dev, int id)
 778 {
 779         struct vlan_ioctl_args ifr = {
 780                 .cmd = SET_VLAN_NAME_TYPE_CMD,
 781                 .u.name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD,
 782         };
 783
 784         ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 785
 786         if (id < 0) {
 787                 ifr.cmd = DEL_VLAN_CMD;
 788                 ifr.u.VID = 0;
 789         } else {
 790                 ifr.cmd = ADD_VLAN_CMD;
 791                 ifr.u.VID = id;
 792         }
 793         strncpy(ifr.device1, dev->ifname, sizeof(ifr.device1));
 794         return ioctl(sock_ioctl, SIOCSIFVLAN, &ifr);
 795 }
 796
 797 int system_vlan_add(struct device *dev, int id)
 798 {
 799         return system_vlan(dev, id);
 800 }
 801
 802 int system_vlan_del(struct device *dev)
 803 {
 804         return system_vlan(dev, -1);
 805 }
 806
 807 int system_vlandev_add(struct device *vlandev, struct device *dev, struct vlandev_config *cfg)
 808 {
 809         struct nl_msg *msg;
 810         struct nlattr *linkinfo, *data;
 811         struct ifinfomsg iim = { .ifi_family = AF_INET };
 812         int ifindex = system_if_resolve(dev);
 813         int rv;
 814
 815         if (ifindex == 0)
 816                 return -ENOENT;
 817
 818         msg = nlmsg_alloc_simple(RTM_NEWLINK, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL);
 819
 820         if (!msg)
 821                 return -1;
 822
 823         nlmsg_append(msg, &iim, sizeof(iim), 0);
 824         nla_put(msg, IFLA_IFNAME, IFNAMSIZ, vlandev->ifname);
 825         nla_put_u32(msg, IFLA_LINK, ifindex);
 826
 827         if (!(linkinfo = nla_nest_start(msg, IFLA_LINKINFO)))
 828                 goto nla_put_failure;
 829
 830         nla_put(msg, IFLA_INFO_KIND, strlen("vlan"), "vlan");
 831
 832
 833         if (!(data = nla_nest_start(msg, IFLA_INFO_DATA)))
 834                 goto nla_put_failure;
 835
 836         nla_put_u16(msg, IFLA_VLAN_ID, cfg->vid);
 837
 838 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)
 839         nla_put_u16(msg, IFLA_VLAN_PROTOCOL, htons(cfg->proto));
 840 #else
 841         if(cfg->proto == VLAN_PROTO_8021AD)
 842                 netifd_log_message(L_WARNING, "%s Your kernel is older than linux 3.10.0, 802.1ad is not supported defaulting to 802.1q", vlandev->type->name);
 843 #endif
 844
 845         nla_nest_end(msg, data);
 846         nla_nest_end(msg, linkinfo);
 847
 848         rv = system_rtnl_call(msg);
 849         if (rv)
 850                 D(SYSTEM, "Error adding vlandev '%s' over '%s': %d\n", vlandev->ifname, dev->ifname, rv);
 851
 852         return rv;
 853
 854 nla_put_failure:
 855         nlmsg_free(msg);
 856         return -ENOMEM;
 857 }
 858
 859 int system_vlandev_del(struct device *vlandev)
 860 {
 861         struct nl_msg *msg;
 862         struct ifinfomsg iim;
 863
 864         iim.ifi_family = AF_INET;
 865         iim.ifi_index  = 0;
 866
 867         msg = nlmsg_alloc_simple(RTM_DELLINK, 0);
 868
 869         if (!msg)
 870                 return -1;
 871
 872         nlmsg_append(msg, &iim, sizeof(iim), 0);
 873
 874         nla_put(msg, IFLA_INFO_KIND, strlen("vlan"), "vlan");
 875         nla_put(msg, IFLA_IFNAME, sizeof(vlandev->ifname), vlandev->ifname);
 876
 877         system_rtnl_call(msg);
 878
 879         return 0;
 880 }
 881
 882 static void
 883 system_if_get_settings(struct device *dev, struct device_settings *s)
 884 {
 885         struct ifreq ifr;
 886         char buf[10];
 887
 888         memset(&ifr, 0, sizeof(ifr));
 889         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 890
 891         if (ioctl(sock_ioctl, SIOCGIFMTU, &ifr) == 0) {
 892                 s->mtu = ifr.ifr_mtu;
 893                 s->flags |= DEV_OPT_MTU;
 894         }
 895
 896         if (ioctl(sock_ioctl, SIOCGIFTXQLEN, &ifr) == 0) {
 897                 s->txqueuelen = ifr.ifr_qlen;
 898                 s->flags |= DEV_OPT_TXQUEUELEN;
 899         }
 900
 901         if (ioctl(sock_ioctl, SIOCGIFHWADDR, &ifr) == 0) {
 902                 memcpy(s->macaddr, &ifr.ifr_hwaddr.sa_data, sizeof(s->macaddr));
 903                 s->flags |= DEV_OPT_MACADDR;
 904         }
 905
 906         if (!system_get_disable_ipv6(dev, buf, sizeof(buf))) {
 907                 s->ipv6 = !strtoul(buf, NULL, 0);
 908                 s->flags |= DEV_OPT_IPV6;
 909         }
 910 }
 911
 912 void
 913 system_if_apply_settings(struct device *dev, struct device_settings *s, unsigned int apply_mask)
 914 {
 915         struct ifreq ifr;
 916
 917         if (!apply_mask)
 918                 return;
 919
 920         memset(&ifr, 0, sizeof(ifr));
 921         strncpy(ifr.ifr_name, dev->ifname, sizeof(ifr.ifr_name));
 922         if (s->flags & DEV_OPT_MTU & apply_mask) {
 923                 ifr.ifr_mtu = s->mtu;
 924                 if (ioctl(sock_ioctl, SIOCSIFMTU, &ifr) < 0)
 925                         s->flags &= ~DEV_OPT_MTU;
 926         }
 927         if (s->flags & DEV_OPT_TXQUEUELEN & apply_mask) {
 928                 ifr.ifr_qlen = s->txqueuelen;
 929                 if (ioctl(sock_ioctl, SIOCSIFTXQLEN, &ifr) < 0)
 930                         s->flags &= ~DEV_OPT_TXQUEUELEN;
 931         }
 932         if ((s->flags & DEV_OPT_MACADDR & apply_mask) && !dev->external) {
 933                 ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
 934                 memcpy(&ifr.ifr_hwaddr.sa_data, s->macaddr, sizeof(s->macaddr));
 935                 if (ioctl(sock_ioctl, SIOCSIFHWADDR, &ifr) < 0)
 936                         s->flags &= ~DEV_OPT_MACADDR;
 937         }
 938         if (s->flags & DEV_OPT_IPV6 & apply_mask)
 939                 system_set_disable_ipv6(dev, s->ipv6 ? "0" : "1");
 940 }
 941
 942 int system_if_up(struct device *dev)
 943 {
 944         system_if_get_settings(dev, &dev->orig_settings);
 945         system_if_apply_settings(dev, &dev->settings, dev->settings.flags);
 946         device_set_ifindex(dev, system_if_resolve(dev));
 947         return system_if_flags(dev->ifname, IFF_UP, 0);
 948 }
 949
 950 int system_if_down(struct device *dev)
 951 {
 952         int ret = system_if_flags(dev->ifname, 0, IFF_UP);
 953         dev->orig_settings.flags &= dev->settings.flags;
 954         system_if_apply_settings(dev, &dev->orig_settings, dev->orig_settings.flags);
 955         return ret;
 956 }
 957
 958 struct if_check_data {
 959         struct device *dev;
 960         int pending;
 961         int ret;
 962 };
 963
 964 static int cb_if_check_valid(struct nl_msg *msg, void *arg)
 965 {
 966         struct nlmsghdr *nh = nlmsg_hdr(msg);
 967         struct ifinfomsg *ifi = NLMSG_DATA(nh);
 968         struct if_check_data *chk = (struct if_check_data *)arg;
 969
 970         if (nh->nlmsg_type != RTM_NEWLINK)
 971                 return NL_SKIP;
 972
 973         device_set_present(chk->dev, ifi->ifi_index > 0 ? true : false);
 974         device_set_link(chk->dev, ifi->ifi_flags & IFF_LOWER_UP ? true : false);
 975
 976         return NL_OK;
 977 }
 978
 979 static int cb_if_check_ack(struct nl_msg *msg, void *arg)
 980 {
 981         struct if_check_data *chk = (struct if_check_data *)arg;
 982         chk->pending = 0;
 983         return NL_STOP;
 984 }
 985
 986 static int cb_if_check_error(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
 987 {
 988         struct if_check_data *chk = (struct if_check_data *)arg;
 989
 990         device_set_present(chk->dev, false);
 991         device_set_link(chk->dev, false);
 992         chk->pending = err->error;
 993
 994         return NL_STOP;
 995 }
 996
 997 int system_if_check(struct device *dev)
 998 {
 999         struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT);
1000         struct nl_msg *msg;
1001         struct ifinfomsg ifi = {
1002                 .ifi_family = AF_UNSPEC,
1003                 .ifi_index = 0,
1004         };
1005         struct if_check_data chk = {
1006                 .dev = dev,
1007                 .pending = 1,
1008         };
1009         int ret = 1;
1010
1011         msg = nlmsg_alloc_simple(RTM_GETLINK, 0);
1012         if (!msg || nlmsg_append(msg, &ifi, sizeof(ifi), 0) ||
1013             nla_put_string(msg, IFLA_IFNAME, dev->ifname))
1014                 goto out;
1015
1016         nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_if_check_valid, &chk);
1017         nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, cb_if_check_ack, &chk);
1018         nl_cb_err(cb, NL_CB_CUSTOM, cb_if_check_error, &chk);
1019
1020         nl_send_auto_complete(sock_rtnl, msg);
1021         while (chk.pending > 0)
1022                 nl_recvmsgs(sock_rtnl, cb);
1023
1024         nlmsg_free(msg);
1025         ret = chk.pending;
1026
1027 out:
1028         nl_cb_put(cb);
1029         return ret;
1030 }
1031
1032 struct device *
1033 system_if_get_parent(struct device *dev)
1034 {
1035         char buf[64], *devname;
1036         int ifindex, iflink, len;
1037         FILE *f;
1038
1039         snprintf(buf, sizeof(buf), "/sys/class/net/%s/iflink", dev->ifname);
1040         f = fopen(buf, "r");
1041         if (!f)
1042                 return NULL;
1043
1044         len = fread(buf, 1, sizeof(buf) - 1, f);
1045         fclose(f);
1046
1047         if (len <= 0)
1048                 return NULL;
1049
1050         buf[len] = 0;
1051         iflink = strtoul(buf, NULL, 0);
1052         ifindex = system_if_resolve(dev);
1053         if (!iflink || iflink == ifindex)
1054                 return NULL;
1055
1056         devname = if_indextoname(iflink, buf);
1057         if (!devname)
1058                 return NULL;
1059
1060         return device_get(devname, true);
1061 }
1062
1063 static bool
1064 read_string_file(int dir_fd, const char *file, char *buf, int len)
1065 {
1066         bool ret = false;
1067         char *c;
1068         int fd;
1069
1070         fd = openat(dir_fd, file, O_RDONLY);
1071         if (fd < 0)
1072                 return false;
1073
1074 retry:
1075         len = read(fd, buf, len - 1);
1076         if (len < 0) {
1077                 if (errno == EINTR)
1078                         goto retry;
1079         } else if (len > 0) {
1080                         buf[len] = 0;
1081
1082                         c = strchr(buf, '\n');
1083                         if (c)
1084                                 *c = 0;
1085
1086                         ret = true;
1087         }
1088
1089         close(fd);
1090
1091         return ret;
1092 }
1093
1094 static bool
1095 read_uint64_file(int dir_fd, const char *file, uint64_t *val)
1096 {
1097         char buf[64];
1098         bool ret = false;
1099
1100         ret = read_string_file(dir_fd, file, buf, sizeof(buf));
1101         if (ret)
1102                 *val = strtoull(buf, NULL, 0);
1103
1104         return ret;
1105 }
1106
1107 /* Assume advertised flags == supported flags */
1108 static const struct {
1109         uint32_t mask;
1110         const char *name;
1111 } ethtool_link_modes[] = {
1112         { ADVERTISED_10baseT_Half, "10H" },
1113         { ADVERTISED_10baseT_Full, "10F" },
1114         { ADVERTISED_100baseT_Half, "100H" },
1115         { ADVERTISED_100baseT_Full, "100F" },
1116         { ADVERTISED_1000baseT_Half, "1000H" },
1117         { ADVERTISED_1000baseT_Full, "1000F" },
1118 };
1119
1120 static void system_add_link_modes(struct blob_buf *b, __u32 mask)
1121 {
1122         int i;
1123         for (i = 0; i < ARRAY_SIZE(ethtool_link_modes); i++) {
1124                 if (mask & ethtool_link_modes[i].mask)
1125                         blobmsg_add_string(b, NULL, ethtool_link_modes[i].name);
1126         }
1127 }
1128
1129 bool
1130 system_if_force_external(const char *ifname)
1131 {
1132         char buf[64];
1133         struct stat s;
1134
1135         snprintf(buf, sizeof(buf), "/sys/class/net/%s/phy80211", ifname);
1136         return stat(buf, &s) == 0;
1137 }
1138
1139 int
1140 system_if_dump_info(struct device *dev, struct blob_buf *b)
1141 {
1142         struct ethtool_cmd ecmd;
1143         struct ifreq ifr;
1144         char buf[64], *s;
1145         void *c;
1146         int dir_fd;
1147
1148         snprintf(buf, sizeof(buf), "/sys/class/net/%s", dev->ifname);
1149         dir_fd = open(buf, O_DIRECTORY);
1150
1151         memset(&ecmd, 0, sizeof(ecmd));
1152         memset(&ifr, 0, sizeof(ifr));
1153         strcpy(ifr.ifr_name, dev->ifname);
1154         ifr.ifr_data = (caddr_t) &ecmd;
1155         ecmd.cmd = ETHTOOL_GSET;
1156
1157         if (ioctl(sock_ioctl, SIOCETHTOOL, &ifr) == 0) {
1158                 c = blobmsg_open_array(b, "link-advertising");
1159                 system_add_link_modes(b, ecmd.advertising);
1160                 blobmsg_close_array(b, c);
1161
1162                 c = blobmsg_open_array(b, "link-supported");
1163                 system_add_link_modes(b, ecmd.supported);
1164                 blobmsg_close_array(b, c);
1165
1166                 s = blobmsg_alloc_string_buffer(b, "speed", 8);
1167                 snprintf(s, 8, "%d%c", ethtool_cmd_speed(&ecmd),
1168                         ecmd.duplex == DUPLEX_HALF ? 'H' : 'F');
1169                 blobmsg_add_string_buffer(b);
1170         }
1171
1172         close(dir_fd);
1173         return 0;
1174 }
1175
1176 int
1177 system_if_dump_stats(struct device *dev, struct blob_buf *b)
1178 {
1179         const char *const counters[] = {
1180                 "collisions",     "rx_frame_errors",   "tx_compressed",
1181                 "multicast",      "rx_length_errors",  "tx_dropped",
1182                 "rx_bytes",       "rx_missed_errors",  "tx_errors",
1183                 "rx_compressed",  "rx_over_errors",    "tx_fifo_errors",
1184                 "rx_crc_errors",  "rx_packets",        "tx_heartbeat_errors",
1185                 "rx_dropped",     "tx_aborted_errors", "tx_packets",
1186                 "rx_errors",      "tx_bytes",          "tx_window_errors",
1187                 "rx_fifo_errors", "tx_carrier_errors",
1188         };
1189         char buf[64];
1190         int stats_dir;
1191         int i;
1192         uint64_t val = 0;
1193
1194         snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics", dev->ifname);
1195         stats_dir = open(buf, O_DIRECTORY);
1196         if (stats_dir < 0)
1197                 return -1;
1198
1199         for (i = 0; i < ARRAY_SIZE(counters); i++)
1200                 if (read_uint64_file(stats_dir, counters[i], &val))
1201                         blobmsg_add_u64(b, counters[i], val);
1202
1203         close(stats_dir);
1204         return 0;
1205 }
1206
1207 static int system_addr(struct device *dev, struct device_addr *addr, int cmd)
1208 {
1209         bool v4 = ((addr->flags & DEVADDR_FAMILY) == DEVADDR_INET4);
1210         int alen = v4 ? 4 : 16;
1211         unsigned int flags = 0;
1212         struct ifaddrmsg ifa = {
1213                 .ifa_family = (alen == 4) ? AF_INET : AF_INET6,
1214                 .ifa_prefixlen = addr->mask,
1215                 .ifa_index = dev->ifindex,
1216         };
1217
1218         struct nl_msg *msg;
1219         if (cmd == RTM_NEWADDR)
1220                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1221
1222         msg = nlmsg_alloc_simple(cmd, flags);
1223         if (!msg)
1224                 return -1;
1225
1226         nlmsg_append(msg, &ifa, sizeof(ifa), 0);
1227         nla_put(msg, IFA_LOCAL, alen, &addr->addr);
1228         if (v4) {
1229                 if (addr->broadcast)
1230                         nla_put_u32(msg, IFA_BROADCAST, addr->broadcast);
1231                 if (addr->point_to_point)
1232                         nla_put_u32(msg, IFA_ADDRESS, addr->point_to_point);
1233         } else {
1234                 time_t now = system_get_rtime();
1235                 struct ifa_cacheinfo cinfo = {0xffffffffU, 0xffffffffU, 0, 0};
1236
1237                 if (addr->preferred_until) {
1238                         int64_t preferred = addr->preferred_until - now;
1239                         if (preferred < 0)
1240                                 preferred = 0;
1241                         else if (preferred > UINT32_MAX)
1242                                 preferred = UINT32_MAX;
1243
1244                         cinfo.ifa_prefered = preferred;
1245                 }
1246
1247                 if (addr->valid_until) {
1248                         int64_t valid = addr->valid_until - now;
1249                         if (valid <= 0)
1250                                 return -1;
1251                         else if (valid > UINT32_MAX)
1252                                 valid = UINT32_MAX;
1253
1254                         cinfo.ifa_valid = valid;
1255                 }
1256
1257                 nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo);
1258         }
1259
1260         return system_rtnl_call(msg);
1261 }
1262
1263 int system_add_address(struct device *dev, struct device_addr *addr)
1264 {
1265         return system_addr(dev, addr, RTM_NEWADDR);
1266 }
1267
1268 int system_del_address(struct device *dev, struct device_addr *addr)
1269 {
1270         return system_addr(dev, addr, RTM_DELADDR);
1271 }
1272
1273 static int system_rt(struct device *dev, struct device_route *route, int cmd)
1274 {
1275         int alen = ((route->flags & DEVADDR_FAMILY) == DEVADDR_INET4) ? 4 : 16;
1276         bool have_gw;
1277         unsigned int flags = 0;
1278
1279         if (alen == 4)
1280                 have_gw = !!route->nexthop.in.s_addr;
1281         else
1282                 have_gw = route->nexthop.in6.s6_addr32[0] ||
1283                         route->nexthop.in6.s6_addr32[1] ||
1284                         route->nexthop.in6.s6_addr32[2] ||
1285                         route->nexthop.in6.s6_addr32[3];
1286
1287         unsigned char scope = (cmd == RTM_DELROUTE) ? RT_SCOPE_NOWHERE :
1288                         (have_gw) ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK;
1289
1290         unsigned int table = (route->flags & (DEVROUTE_TABLE | DEVROUTE_SRCTABLE))
1291                         ? route->table : RT_TABLE_MAIN;
1292
1293         struct rtmsg rtm = {
1294                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1295                 .rtm_dst_len = route->mask,
1296                 .rtm_src_len = route->sourcemask,
1297                 .rtm_table = (table < 256) ? table : RT_TABLE_UNSPEC,
1298                 .rtm_protocol = (route->flags & DEVADDR_KERNEL) ? RTPROT_KERNEL : RTPROT_STATIC,
1299                 .rtm_scope = scope,
1300                 .rtm_type = (cmd == RTM_DELROUTE) ? 0: RTN_UNICAST,
1301                 .rtm_flags = (route->flags & DEVROUTE_ONLINK) ? RTNH_F_ONLINK : 0,
1302         };
1303         struct nl_msg *msg;
1304
1305         if (cmd == RTM_NEWROUTE) {
1306                 flags |= NLM_F_CREATE | NLM_F_REPLACE;
1307
1308                 if (!dev) { // Add null-route
1309                         rtm.rtm_scope = RT_SCOPE_UNIVERSE;
1310                         rtm.rtm_type = RTN_UNREACHABLE;
1311                 }
1312         }
1313
1314         msg = nlmsg_alloc_simple(cmd, flags);
1315         if (!msg)
1316                 return -1;
1317
1318         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1319
1320         if (route->mask)
1321                 nla_put(msg, RTA_DST, alen, &route->addr);
1322
1323         if (route->sourcemask)
1324                 nla_put(msg, RTA_SRC, alen, &route->source);
1325
1326         if (route->metric > 0)
1327                 nla_put_u32(msg, RTA_PRIORITY, route->metric);
1328
1329         if (have_gw)
1330                 nla_put(msg, RTA_GATEWAY, alen, &route->nexthop);
1331
1332         if (dev)
1333                 nla_put_u32(msg, RTA_OIF, dev->ifindex);
1334
1335         if (table >= 256)
1336                 nla_put_u32(msg, RTA_TABLE, table);
1337
1338         if (route->flags & DEVROUTE_MTU) {
1339                 struct nlattr *metrics;
1340
1341                 if (!(metrics = nla_nest_start(msg, RTA_METRICS)))
1342                         goto nla_put_failure;
1343
1344                 nla_put_u32(msg, RTAX_MTU, route->mtu);
1345
1346                 nla_nest_end(msg, metrics);
1347         }
1348
1349         return system_rtnl_call(msg);
1350
1351 nla_put_failure:
1352         nlmsg_free(msg);
1353         return -ENOMEM;
1354 }
1355
1356 int system_add_route(struct device *dev, struct device_route *route)
1357 {
1358         return system_rt(dev, route, RTM_NEWROUTE);
1359 }
1360
1361 int system_del_route(struct device *dev, struct device_route *route)
1362 {
1363         return system_rt(dev, route, RTM_DELROUTE);
1364 }
1365
1366 int system_flush_routes(void)
1367 {
1368         const char *names[] = {
1369                 "/proc/sys/net/ipv4/route/flush",
1370                 "/proc/sys/net/ipv6/route/flush"
1371         };
1372         int fd, i;
1373
1374         for (i = 0; i < ARRAY_SIZE(names); i++) {
1375                 fd = open(names[i], O_WRONLY);
1376                 if (fd < 0)
1377                         continue;
1378
1379                 if (write(fd, "-1", 2)) {}
1380                 close(fd);
1381         }
1382         return 0;
1383 }
1384
1385 bool system_resolve_rt_table(const char *name, unsigned int *id)
1386 {
1387         FILE *f;
1388         char *e, buf[128];
1389         unsigned int n, table = RT_TABLE_UNSPEC;
1390
1391         /* first try to parse table as number */
1392         if ((n = strtoul(name, &e, 0)) > 0 && !*e)
1393                 table = n;
1394
1395         /* handle well known aliases */
1396         else if (!strcmp(name, "default"))
1397                 table = RT_TABLE_DEFAULT;
1398         else if (!strcmp(name, "main"))
1399                 table = RT_TABLE_MAIN;
1400         else if (!strcmp(name, "local"))
1401                 table = RT_TABLE_LOCAL;
1402
1403         /* try to look up name in /etc/iproute2/rt_tables */
1404         else if ((f = fopen("/etc/iproute2/rt_tables", "r")) != NULL)
1405         {
1406                 while (fgets(buf, sizeof(buf) - 1, f) != NULL)
1407                 {
1408                         if ((e = strtok(buf, " \t\n")) == NULL || *e == '#')
1409                                 continue;
1410
1411                         n = strtoul(e, NULL, 10);
1412                         e = strtok(NULL, " \t\n");
1413
1414                         if (e && !strcmp(e, name))
1415                         {
1416                                 table = n;
1417                                 break;
1418                         }
1419                 }
1420
1421                 fclose(f);
1422         }
1423
1424         if (table == RT_TABLE_UNSPEC)
1425                 return false;
1426
1427         /* do not consider main table special */
1428         if (table == RT_TABLE_MAIN)
1429                 table = RT_TABLE_UNSPEC;
1430
1431         *id = table;
1432         return true;
1433 }
1434
1435 static int system_iprule(struct iprule *rule, int cmd)
1436 {
1437         int alen = ((rule->flags & IPRULE_FAMILY) == IPRULE_INET4) ? 4 : 16;
1438
1439         struct nl_msg *msg;
1440         struct rtmsg rtm = {
1441                 .rtm_family = (alen == 4) ? AF_INET : AF_INET6,
1442                 .rtm_protocol = RTPROT_STATIC,
1443                 .rtm_scope = RT_SCOPE_UNIVERSE,
1444                 .rtm_table = RT_TABLE_UNSPEC,
1445                 .rtm_type = RTN_UNSPEC,
1446                 .rtm_flags = 0,
1447         };
1448
1449         if (cmd == RTM_NEWRULE) {
1450                 rtm.rtm_type = RTN_UNICAST;
1451                 rtm.rtm_flags |= NLM_F_REPLACE | NLM_F_EXCL;
1452         }
1453
1454         if (rule->invert)
1455                 rtm.rtm_flags |= FIB_RULE_INVERT;
1456
1457         if (rule->flags & IPRULE_SRC)
1458                 rtm.rtm_src_len = rule->src_mask;
1459
1460         if (rule->flags & IPRULE_DEST)
1461                 rtm.rtm_dst_len = rule->dest_mask;
1462
1463         if (rule->flags & IPRULE_TOS)
1464                 rtm.rtm_tos = rule->tos;
1465
1466         if (rule->flags & IPRULE_LOOKUP) {
1467                 if (rule->lookup < 256)
1468                         rtm.rtm_table = rule->lookup;
1469         }
1470
1471         if (rule->flags & IPRULE_ACTION)
1472                 rtm.rtm_type = rule->action;
1473         else if (rule->flags & IPRULE_GOTO)
1474                 rtm.rtm_type = FR_ACT_GOTO;
1475         else if (!(rule->flags & (IPRULE_LOOKUP | IPRULE_ACTION | IPRULE_GOTO)))
1476                 rtm.rtm_type = FR_ACT_NOP;
1477
1478         msg = nlmsg_alloc_simple(cmd, NLM_F_REQUEST);
1479
1480         if (!msg)
1481                 return -1;
1482
1483         nlmsg_append(msg, &rtm, sizeof(rtm), 0);
1484
1485         if (rule->flags & IPRULE_IN)
1486                 nla_put(msg, FRA_IFNAME, strlen(rule->in_dev) + 1, rule->in_dev);
1487
1488         if (rule->flags & IPRULE_OUT)
1489                 nla_put(msg, FRA_OIFNAME, strlen(rule->out_dev) + 1, rule->out_dev);
1490
1491         if (rule->flags & IPRULE_SRC)
1492                 nla_put(msg, FRA_SRC, alen, &rule->src_addr);
1493
1494         if (rule->flags & IPRULE_DEST)
1495                 nla_put(msg, FRA_DST, alen, &rule->dest_addr);
1496
1497         if (rule->flags & IPRULE_PRIORITY)
1498                 nla_put_u32(msg, FRA_PRIORITY, rule->priority);
1499         else if (cmd == RTM_NEWRULE)
1500                 nla_put_u32(msg, FRA_PRIORITY, rule->order);
1501
1502         if (rule->flags & IPRULE_FWMARK)
1503                 nla_put_u32(msg, FRA_FWMARK, rule->fwmark);
1504
1505         if (rule->flags & IPRULE_FWMASK)
1506                 nla_put_u32(msg, FRA_FWMASK, rule->fwmask);
1507
1508         if (rule->flags & IPRULE_LOOKUP) {
1509                 if (rule->lookup >= 256)
1510                         nla_put_u32(msg, FRA_TABLE, rule->lookup);
1511         }
1512
1513         if (rule->flags & IPRULE_GOTO)
1514                 nla_put_u32(msg, FRA_GOTO, rule->gotoid);
1515
1516         return system_rtnl_call(msg);
1517 }
1518
1519 int system_add_iprule(struct iprule *rule)
1520 {
1521         return system_iprule(rule, RTM_NEWRULE);
1522 }
1523
1524 int system_del_iprule(struct iprule *rule)
1525 {
1526         return system_iprule(rule, RTM_DELRULE);
1527 }
1528
1529 int system_flush_iprules(void)
1530 {
1531         int rv = 0;
1532         struct iprule rule;
1533
1534         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET);
1535         system_if_clear_entries(NULL, RTM_GETRULE, AF_INET6);
1536
1537         memset(&rule, 0, sizeof(rule));
1538
1539
1540         rule.flags = IPRULE_INET4 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1541
1542         rule.priority = 0;
1543         rule.lookup = RT_TABLE_LOCAL;
1544         rv |= system_iprule(&rule, RTM_NEWRULE);
1545
1546         rule.priority = 32766;
1547         rule.lookup = RT_TABLE_MAIN;
1548         rv |= system_iprule(&rule, RTM_NEWRULE);
1549
1550         rule.priority = 32767;
1551         rule.lookup = RT_TABLE_DEFAULT;
1552         rv |= system_iprule(&rule, RTM_NEWRULE);
1553
1554
1555         rule.flags = IPRULE_INET6 | IPRULE_PRIORITY | IPRULE_LOOKUP;
1556
1557         rule.priority = 0;
1558         rule.lookup = RT_TABLE_LOCAL;
1559         rv |= system_iprule(&rule, RTM_NEWRULE);
1560
1561         rule.priority = 32766;
1562         rule.lookup = RT_TABLE_MAIN;
1563         rv |= system_iprule(&rule, RTM_NEWRULE);
1564
1565         return rv;
1566 }
1567
1568 bool system_resolve_iprule_action(const char *action, unsigned int *id)
1569 {
1570         char *e;
1571         unsigned int n;
1572
1573         if (!strcmp(action, "local"))
1574                 n = RTN_LOCAL;
1575         else if (!strcmp(action, "nat"))
1576                 n = RTN_NAT;
1577         else if (!strcmp(action, "broadcast"))
1578                 n = RTN_BROADCAST;
1579         else if (!strcmp(action, "anycast"))
1580                 n = RTN_ANYCAST;
1581         else if (!strcmp(action, "multicast"))
1582                 n = RTN_MULTICAST;
1583         else if (!strcmp(action, "prohibit"))
1584                 n = RTN_PROHIBIT;
1585         else if (!strcmp(action, "unreachable"))
1586                 n = RTN_UNREACHABLE;
1587         else if (!strcmp(action, "blackhole"))
1588                 n = RTN_BLACKHOLE;
1589         else if (!strcmp(action, "xresolve"))
1590                 n = RTN_XRESOLVE;
1591         else if (!strcmp(action, "unicast"))
1592                 n = RTN_UNICAST;
1593         else if (!strcmp(action, "throw"))
1594                 n = RTN_THROW;
1595         else if (!strcmp(action, "failed_policy"))
1596                 n = RTN_FAILED_POLICY;
1597         else {
1598                 n = strtoul(action, &e, 0);
1599                 if (!e || *e || e == action || n > 255)
1600                         return false;
1601         }
1602
1603         *id = n;
1604         return true;
1605 }
1606
1607 time_t system_get_rtime(void)
1608 {
1609         struct timespec ts;
1610         struct timeval tv;
1611
1612         if (syscall(__NR_clock_gettime, CLOCK_MONOTONIC, &ts) == 0)
1613                 return ts.tv_sec;
1614
1615         if (gettimeofday(&tv, NULL) == 0)
1616                 return tv.tv_sec;
1617
1618         return 0;
1619 }
1620
1621 #ifndef IP_DF
1622 #define IP_DF       0x4000
1623 #endif
1624
1625 static int tunnel_ioctl(const char *name, int cmd, void *p)
1626 {
1627         struct ifreq ifr;
1628
1629         memset(&ifr, 0, sizeof(ifr));
1630         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1631         ifr.ifr_ifru.ifru_data = p;
1632         return ioctl(sock_ioctl, cmd, &ifr);
1633 }
1634
1635 int system_del_ip_tunnel(const char *name)
1636 {
1637         return tunnel_ioctl(name, SIOCDELTUNNEL, NULL);
1638 }
1639
1640 int system_update_ipv6_mtu(struct device *dev, int mtu)
1641 {
1642         int ret = -1;
1643         char buf[64];
1644         snprintf(buf, sizeof(buf), "/proc/sys/net/ipv6/conf/%s/mtu",
1645                         dev->ifname);
1646
1647         int fd = open(buf, O_RDWR);
1648         ssize_t len = read(fd, buf, sizeof(buf) - 1);
1649         if (len < 0)
1650                 goto out;
1651
1652         buf[len] = 0;
1653         ret = atoi(buf);
1654
1655         if (!mtu || ret <= mtu)
1656                 goto out;
1657
1658         lseek(fd, 0, SEEK_SET);
1659         if (write(fd, buf, snprintf(buf, sizeof(buf), "%i", mtu)) <= 0)
1660                 ret = -1;
1661
1662 out:
1663         close(fd);
1664         return ret;
1665 }
1666
1667 int system_add_ip_tunnel(const char *name, struct blob_attr *attr)
1668 {
1669         struct blob_attr *tb[__TUNNEL_ATTR_MAX];
1670         struct blob_attr *cur;
1671         bool set_df = true;
1672         const char *str;
1673
1674         system_del_ip_tunnel(name);
1675
1676         blobmsg_parse(tunnel_attr_list.params, __TUNNEL_ATTR_MAX, tb,
1677                 blob_data(attr), blob_len(attr));
1678
1679         if (!(cur = tb[TUNNEL_ATTR_TYPE]))
1680                 return -EINVAL;
1681         str = blobmsg_data(cur);
1682
1683         if ((cur = tb[TUNNEL_ATTR_DF]))
1684                 set_df = blobmsg_get_bool(cur);
1685
1686         unsigned int ttl = 0;
1687         if ((cur = tb[TUNNEL_ATTR_TTL])) {
1688                 ttl = blobmsg_get_u32(cur);
1689                 if (ttl > 255 || (!set_df && ttl))
1690                         return -EINVAL;
1691         }
1692
1693         unsigned int link = 0;
1694         if ((cur = tb[TUNNEL_ATTR_LINK])) {
1695                 struct interface *iface = vlist_find(&interfaces, blobmsg_data(cur), iface, node);
1696                 if (!iface)
1697                         return -EINVAL;
1698
1699                 if (iface->l3_dev.dev)
1700                         link = iface->l3_dev.dev->ifindex;
1701         }
1702
1703         if (!strcmp(str, "sit")) {
1704                 struct ip_tunnel_parm p = {
1705                         .link = link,
1706                         .iph = {
1707                                 .version = 4,
1708                                 .ihl = 5,
1709                                 .frag_off = set_df ? htons(IP_DF) : 0,
1710                                 .protocol = IPPROTO_IPV6,
1711                                 .ttl = ttl
1712                         }
1713                 };
1714
1715                 if ((cur = tb[TUNNEL_ATTR_LOCAL]) &&
1716                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.saddr) < 1)
1717                         return -EINVAL;
1718
1719                 if ((cur = tb[TUNNEL_ATTR_REMOTE]) &&
1720                                 inet_pton(AF_INET, blobmsg_data(cur), &p.iph.daddr) < 1)
1721                         return -EINVAL;
1722
1723                 strncpy(p.name, name, sizeof(p.name));
1724                 if (tunnel_ioctl("sit0", SIOCADDTUNNEL, &p) < 0)
1725                         return -1;
1726
1727 #ifdef SIOCADD6RD
1728                 if ((cur = tb[TUNNEL_ATTR_6RD_PREFIX])) {
1729                         unsigned int mask;
1730                         struct ip_tunnel_6rd p6;
1731
1732                         memset(&p6, 0, sizeof(p6));
1733
1734                         if (!parse_ip_and_netmask(AF_INET6, blobmsg_data(cur),
1735                                                 &p6.prefix, &mask) || mask > 128)
1736                                 return -EINVAL;
1737                         p6.prefixlen = mask;
1738
1739                         if ((cur = tb[TUNNEL_ATTR_6RD_RELAY_PREFIX])) {
1740                                 if (!parse_ip_and_netmask(AF_INET, blobmsg_data(cur),
1741                                                         &p6.relay_prefix, &mask) || mask > 32)
1742                                         return -EINVAL;
1743                                 p6.relay_prefixlen = mask;
1744                         }
1745
1746                         if (tunnel_ioctl(name, SIOCADD6RD, &p6) < 0) {
1747                                 system_del_ip_tunnel(name);
1748                                 return -1;
1749                         }
1750                 }
1751 #endif
1752         } else if (!strcmp(str, "ipip6")) {
1753                 struct nl_msg *nlm = nlmsg_alloc_simple(RTM_NEWLINK,
1754                                 NLM_F_REQUEST | NLM_F_REPLACE | NLM_F_CREATE);
1755
1756                 struct ifinfomsg ifi = { .ifi_family = AF_UNSPEC };
1757                 nlmsg_append(nlm, &ifi, sizeof(ifi), 0);
1758                 nla_put_string(nlm, IFLA_IFNAME, name);
1759
1760                 if (link)
1761                         nla_put_u32(nlm, IFLA_LINK, link);
1762
1763                 struct nlattr *linkinfo = nla_nest_start(nlm, IFLA_LINKINFO);
1764                 nla_put_string(nlm, IFLA_INFO_KIND, "ip6tnl");
1765                 struct nlattr *infodata = nla_nest_start(nlm, IFLA_INFO_DATA);
1766
1767                 if (link)
1768                         nla_put_u32(nlm, IFLA_IPTUN_LINK, link);
1769
1770                 nla_put_u8(nlm, IFLA_IPTUN_PROTO, IPPROTO_IPIP);
1771                 nla_put_u8(nlm, IFLA_IPTUN_TTL, (ttl) ? ttl : 64);
1772                 nla_put_u8(nlm, IFLA_IPTUN_ENCAP_LIMIT, 4);
1773
1774                 struct in6_addr in6buf;
1775                 if ((cur = tb[TUNNEL_ATTR_LOCAL])) {
1776                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1)
1777                                 return -EINVAL;
1778                         nla_put(nlm, IFLA_IPTUN_LOCAL, sizeof(in6buf), &in6buf);
1779                 }
1780
1781                 if ((cur = tb[TUNNEL_ATTR_REMOTE])) {
1782                         if (inet_pton(AF_INET6, blobmsg_data(cur), &in6buf) < 1)
1783                                 return -EINVAL;
1784                         nla_put(nlm, IFLA_IPTUN_REMOTE, sizeof(in6buf), &in6buf);
1785                 }
1786
1787 #ifdef IFLA_IPTUN_FMR_MAX
1788                 if ((cur = tb[TUNNEL_ATTR_FMRS])) {
1789                         struct nlattr *fmrs = nla_nest_start(nlm, IFLA_IPTUN_FMRS);
1790
1791                         struct blob_attr *fmr;
1792                         unsigned rem, fmrcnt = 0;
1793                         blobmsg_for_each_attr(fmr, cur, rem) {
1794                                 if (blobmsg_type(fmr) != BLOBMSG_TYPE_STRING)
1795                                         continue;
1796
1797                                 unsigned ip4len, ip6len, ealen, offset = 6;
1798                                 char ip6buf[48];
1799                                 char ip4buf[16];
1800
1801                                 if (sscanf(blobmsg_get_string(fmr), "%47[^/]/%u,%15[^/]/%u,%u,%u",
1802                                                 ip6buf, &ip6len, ip4buf, &ip4len, &ealen, &offset) < 5)
1803                                         return -EINVAL;
1804
1805                                 struct in6_addr ip6prefix;
1806                                 struct in_addr ip4prefix;
1807                                 if (inet_pton(AF_INET6, ip6buf, &ip6prefix) != 1 ||
1808                                                 inet_pton(AF_INET, ip4buf, &ip4prefix) != 1)
1809                                         return -EINVAL;
1810
1811                                 struct nlattr *rule = nla_nest_start(nlm, ++fmrcnt);
1812
1813                                 nla_put(nlm, IFLA_IPTUN_FMR_IP6_PREFIX, sizeof(ip6prefix), &ip6prefix);
1814                                 nla_put(nlm, IFLA_IPTUN_FMR_IP4_PREFIX, sizeof(ip4prefix), &ip4prefix);
1815                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP6_PREFIX_LEN, ip6len);
1816                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_IP4_PREFIX_LEN, ip4len);
1817                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_EA_LEN, ealen);
1818                                 nla_put_u8(nlm, IFLA_IPTUN_FMR_OFFSET, offset);
1819
1820                                 nla_nest_end(nlm, rule);
1821                         }
1822
1823                         nla_nest_end(nlm, fmrs);
1824                 }
1825 #endif
1826
1827                 nla_nest_end(nlm, infodata);
1828                 nla_nest_end(nlm, linkinfo);
1829
1830                 return system_rtnl_call(nlm);
1831         } else
1832                 return -EINVAL;
1833
1834         return 0;
1835 }