ip/iplink.c

   1 /*
   2  * iplink.c             "ip link".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <dlfcn.h>
  19 #include <errno.h>
  20 #include <sys/socket.h>
  21 #include <linux/if.h>
  22 #include <linux/if_packet.h>
  23 #include <linux/if_ether.h>
  24 #include <linux/sockios.h>
  25 #include <netinet/in.h>
  26 #include <arpa/inet.h>
  27 #include <string.h>
  28 #include <sys/ioctl.h>
  29 #include <linux/sockios.h>
  30
  31 #include "rt_names.h"
  32 #include "utils.h"
  33 #include "ip_common.h"
  34
  35 #define IPLINK_IOCTL_COMPAT     1
  36 #ifndef LIBDIR
  37 #define LIBDIR "/usr/lib/"
  38 #endif
  39
  40 static void usage(void) __attribute__((noreturn));
  41 static int iplink_have_newlink(void);
  42
  43 void iplink_usage(void)
  44 {
  45         if (iplink_have_newlink()) {
  46                 fprintf(stderr, "Usage: ip link add [link DEV] [ name ] NAME\n");
  47                 fprintf(stderr, "                   [ txqueuelen PACKETS ]\n");
  48                 fprintf(stderr, "                   [ address LLADDR ]\n");
  49                 fprintf(stderr, "                   [ broadcast LLADDR ]\n");
  50                 fprintf(stderr, "                   [ mtu MTU ]\n");
  51                 fprintf(stderr, "                   type TYPE [ ARGS ]\n");
  52                 fprintf(stderr, "       ip link delete DEV type TYPE [ ARGS ]\n");
  53                 fprintf(stderr, "\n");
  54                 fprintf(stderr, "       ip link set { dev DEVICE | group DEVGROUP } [ { up | down } ]\n");
  55         } else
  56                 fprintf(stderr, "Usage: ip link set DEVICE [ { up | down } ]\n");
  57
  58         fprintf(stderr, "                         [ arp { on | off } ]\n");
  59         fprintf(stderr, "                         [ dynamic { on | off } ]\n");
  60         fprintf(stderr, "                         [ multicast { on | off } ]\n");
  61         fprintf(stderr, "                         [ allmulticast { on | off } ]\n");
  62         fprintf(stderr, "                         [ promisc { on | off } ]\n");
  63         fprintf(stderr, "                         [ trailers { on | off } ]\n");
  64         fprintf(stderr, "                         [ txqueuelen PACKETS ]\n");
  65         fprintf(stderr, "                         [ name NEWNAME ]\n");
  66         fprintf(stderr, "                         [ address LLADDR ]\n");
  67         fprintf(stderr, "                         [ broadcast LLADDR ]\n");
  68         fprintf(stderr, "                         [ mtu MTU ]\n");
  69         fprintf(stderr, "                         [ netns PID ]\n");
  70         fprintf(stderr, "                         [ netns NAME ]\n");
  71         fprintf(stderr, "                         [ alias NAME ]\n");
  72         fprintf(stderr, "                         [ vf NUM [ mac LLADDR ]\n");
  73         fprintf(stderr, "                                  [ vlan VLANID [ qos VLAN-QOS ] ]\n");
  74
  75         fprintf(stderr, "                                  [ rate TXRATE ] ] \n");
  76
  77         fprintf(stderr, "                                  [ spoofchk { on | off} ] ] \n");
  78         fprintf(stderr, "                         [ master DEVICE ]\n");
  79         fprintf(stderr, "                         [ nomaster ]\n");
  80         fprintf(stderr, "       ip link show [ DEVICE | group GROUP ]\n");
  81
  82         if (iplink_have_newlink()) {
  83                 fprintf(stderr, "\n");
  84                 fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | can | bridge }\n");
  85         }
  86         exit(-1);
  87 }
  88
  89 static void usage(void)
  90 {
  91         iplink_usage();
  92 }
  93
  94 static int on_off(char *msg)
  95 {
  96         fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
  97         return -1;
  98 }
  99
 100 static void *BODY;              /* cached dlopen(NULL) handle */
 101 static struct link_util *linkutil_list;
 102
 103 struct link_util *get_link_kind(const char *id)
 104 {
 105         void *dlh;
 106         char buf[256];
 107         struct link_util *l;
 108
 109         for (l = linkutil_list; l; l = l->next)
 110                 if (strcmp(l->id, id) == 0)
 111                         return l;
 112
 113         snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
 114         dlh = dlopen(buf, RTLD_LAZY);
 115         if (dlh == NULL) {
 116                 /* look in current binary, only open once */
 117                 dlh = BODY;
 118                 if (dlh == NULL) {
 119                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 120                         if (dlh == NULL)
 121                                 return NULL;
 122                 }
 123         }
 124
 125         snprintf(buf, sizeof(buf), "%s_link_util", id);
 126         l = dlsym(dlh, buf);
 127         if (l == NULL)
 128                 return NULL;
 129
 130         l->next = linkutil_list;
 131         linkutil_list = l;
 132         return l;
 133 }
 134
 135 int get_link_mode(const char *mode)
 136 {
 137         if (strcmp(mode, "default") == 0)
 138                 return IF_LINK_MODE_DEFAULT;
 139         if (strcmp(mode, "dormant") == 0)
 140                 return IF_LINK_MODE_DORMANT;
 141         return -1;
 142 }
 143
 144 #if IPLINK_IOCTL_COMPAT
 145 static int have_rtnl_newlink = -1;
 146
 147 static int accept_msg(const struct sockaddr_nl *who,
 148                       struct nlmsghdr *n, void *arg)
 149 {
 150         struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
 151
 152         if (n->nlmsg_type == NLMSG_ERROR &&
 153             (err->error == -EOPNOTSUPP || err->error == -EINVAL))
 154                 have_rtnl_newlink = 0;
 155         else
 156                 have_rtnl_newlink = 1;
 157         return -1;
 158 }
 159
 160 static int iplink_have_newlink(void)
 161 {
 162         struct {
 163                 struct nlmsghdr         n;
 164                 struct ifinfomsg        i;
 165                 char                    buf[1024];
 166         } req;
 167
 168         if (have_rtnl_newlink < 0) {
 169                 memset(&req, 0, sizeof(req));
 170
 171                 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 172                 req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
 173                 req.n.nlmsg_type = RTM_NEWLINK;
 174                 req.i.ifi_family = AF_UNSPEC;
 175
 176                 rtnl_send(&rth, &req.n, req.n.nlmsg_len);
 177                 rtnl_listen(&rth, accept_msg, NULL);
 178         }
 179         return have_rtnl_newlink;
 180 }
 181 #else /* IPLINK_IOCTL_COMPAT */
 182 static int iplink_have_newlink(void)
 183 {
 184         return 1;
 185 }
 186 #endif /* ! IPLINK_IOCTL_COMPAT */
 187
 188 struct iplink_req {
 189         struct nlmsghdr         n;
 190         struct ifinfomsg        i;
 191         char                    buf[1024];
 192 };
 193
 194 int iplink_parse_vf(int vf, int *argcp, char ***argvp,
 195                            struct iplink_req *req)
 196 {
 197         int len, argc = *argcp;
 198         char **argv = *argvp;
 199         struct rtattr *vfinfo;
 200
 201         vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
 202
 203         while (NEXT_ARG_OK()) {
 204                 NEXT_ARG();
 205                 if (matches(*argv, "mac") == 0) {
 206                         struct ifla_vf_mac ivm;
 207                         NEXT_ARG();
 208                         ivm.vf = vf;
 209                         len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
 210                         if (len < 0)
 211                                 return -1;
 212                         addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
 213                 } else if (matches(*argv, "vlan") == 0) {
 214                         struct ifla_vf_vlan ivv;
 215                         NEXT_ARG();
 216                         if (get_unsigned(&ivv.vlan, *argv, 0)) {
 217                                 invarg("Invalid \"vlan\" value\n", *argv);
 218                         }
 219                         ivv.vf = vf;
 220                         ivv.qos = 0;
 221                         if (NEXT_ARG_OK()) {
 222                                 NEXT_ARG();
 223                                 if (matches(*argv, "qos") == 0) {
 224                                         NEXT_ARG();
 225                                         if (get_unsigned(&ivv.qos, *argv, 0)) {
 226                                                 invarg("Invalid \"qos\" value\n", *argv);
 227                                         }
 228                                 } else {
 229                                         /* rewind arg */
 230                                         PREV_ARG();
 231                                 }
 232                         }
 233                         addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
 234                 } else if (matches(*argv, "rate") == 0) {
 235                         struct ifla_vf_tx_rate ivt;
 236                         NEXT_ARG();
 237                         if (get_unsigned(&ivt.rate, *argv, 0)) {
 238                                 invarg("Invalid \"rate\" value\n", *argv);
 239                         }
 240                         ivt.vf = vf;
 241                         addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
 242
 243                 } else if (matches(*argv, "spoofchk") == 0) {
 244                         struct ifla_vf_spoofchk ivs;
 245                         NEXT_ARG();
 246                         if (matches(*argv, "on") == 0)
 247                                 ivs.setting = 1;
 248                         else if (matches(*argv, "off") == 0)
 249                                 ivs.setting = 0;
 250                         else
 251                                 invarg("Invalid \"spoofchk\" value\n", *argv);
 252                         ivs.vf = vf;
 253                         addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
 254
 255                 } else {
 256                         /* rewind arg */
 257                         PREV_ARG();
 258                         break;
 259                 }
 260         }
 261
 262         if (argc == *argcp)
 263                 incomplete_command();
 264
 265         addattr_nest_end(&req->n, vfinfo);
 266
 267         *argcp = argc;
 268         *argvp = argv;
 269         return 0;
 270 }
 271
 272
 273 int iplink_parse(int argc, char **argv, struct iplink_req *req,
 274                 char **name, char **type, char **link, char **dev, int *group)
 275 {
 276         int ret, len;
 277         char abuf[32];
 278         int qlen = -1;
 279         int mtu = -1;
 280         int netns = -1;
 281         int vf = -1;
 282
 283         *group = -1;
 284         ret = argc;
 285
 286         while (argc > 0) {
 287                 if (strcmp(*argv, "up") == 0) {
 288                         req->i.ifi_change |= IFF_UP;
 289                         req->i.ifi_flags |= IFF_UP;
 290                 } else if (strcmp(*argv, "down") == 0) {
 291                         req->i.ifi_change |= IFF_UP;
 292                         req->i.ifi_flags &= ~IFF_UP;
 293                 } else if (strcmp(*argv, "name") == 0) {
 294                         NEXT_ARG();
 295                         *name = *argv;
 296                 } else if (matches(*argv, "link") == 0) {
 297                         NEXT_ARG();
 298                         *link = *argv;
 299                 } else if (matches(*argv, "address") == 0) {
 300                         NEXT_ARG();
 301                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 302                         if (len < 0)
 303                                 return -1;
 304                         addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
 305                 } else if (matches(*argv, "broadcast") == 0 ||
 306                                 strcmp(*argv, "brd") == 0) {
 307                         NEXT_ARG();
 308                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 309                         if (len < 0)
 310                                 return -1;
 311                         addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
 312                 } else if (matches(*argv, "txqueuelen") == 0 ||
 313                                 strcmp(*argv, "qlen") == 0 ||
 314                                 matches(*argv, "txqlen") == 0) {
 315                         NEXT_ARG();
 316                         if (qlen != -1)
 317                                 duparg("txqueuelen", *argv);
 318                         if (get_integer(&qlen,  *argv, 0))
 319                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 320                         addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
 321                 } else if (strcmp(*argv, "mtu") == 0) {
 322                         NEXT_ARG();
 323                         if (mtu != -1)
 324                                 duparg("mtu", *argv);
 325                         if (get_integer(&mtu, *argv, 0))
 326                                 invarg("Invalid \"mtu\" value\n", *argv);
 327                         addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
 328                 } else if (strcmp(*argv, "netns") == 0) {
 329                         NEXT_ARG();
 330                         if (netns != -1)
 331                                 duparg("netns", *argv);
 332                         if ((netns = get_netns_fd(*argv)) >= 0)
 333                                 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
 334                         else if (get_integer(&netns, *argv, 0) == 0)
 335                                 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
 336                         else
 337                                 invarg("Invalid \"netns\" value\n", *argv);
 338                 } else if (strcmp(*argv, "multicast") == 0) {
 339                         NEXT_ARG();
 340                         req->i.ifi_change |= IFF_MULTICAST;
 341                         if (strcmp(*argv, "on") == 0) {
 342                                 req->i.ifi_flags |= IFF_MULTICAST;
 343                         } else if (strcmp(*argv, "off") == 0) {
 344                                 req->i.ifi_flags &= ~IFF_MULTICAST;
 345                         } else
 346                                 return on_off("multicast");
 347                 } else if (strcmp(*argv, "allmulticast") == 0) {
 348                         NEXT_ARG();
 349                         req->i.ifi_change |= IFF_ALLMULTI;
 350                         if (strcmp(*argv, "on") == 0) {
 351                                 req->i.ifi_flags |= IFF_ALLMULTI;
 352                         } else if (strcmp(*argv, "off") == 0) {
 353                                 req->i.ifi_flags &= ~IFF_ALLMULTI;
 354                         } else
 355                                 return on_off("allmulticast");
 356                 } else if (strcmp(*argv, "promisc") == 0) {
 357                         NEXT_ARG();
 358                         req->i.ifi_change |= IFF_PROMISC;
 359                         if (strcmp(*argv, "on") == 0) {
 360                                 req->i.ifi_flags |= IFF_PROMISC;
 361                         } else if (strcmp(*argv, "off") == 0) {
 362                                 req->i.ifi_flags &= ~IFF_PROMISC;
 363                         } else
 364                                 return on_off("promisc");
 365                 } else if (strcmp(*argv, "trailers") == 0) {
 366                         NEXT_ARG();
 367                         req->i.ifi_change |= IFF_NOTRAILERS;
 368                         if (strcmp(*argv, "off") == 0) {
 369                                 req->i.ifi_flags |= IFF_NOTRAILERS;
 370                         } else if (strcmp(*argv, "on") == 0) {
 371                                 req->i.ifi_flags &= ~IFF_NOTRAILERS;
 372                         } else
 373                                 return on_off("trailers");
 374                 } else if (strcmp(*argv, "arp") == 0) {
 375                         NEXT_ARG();
 376                         req->i.ifi_change |= IFF_NOARP;
 377                         if (strcmp(*argv, "on") == 0) {
 378                                 req->i.ifi_flags &= ~IFF_NOARP;
 379                         } else if (strcmp(*argv, "off") == 0) {
 380                                 req->i.ifi_flags |= IFF_NOARP;
 381                         } else
 382                                 return on_off("noarp");
 383                 } else if (strcmp(*argv, "vf") == 0) {
 384                         struct rtattr *vflist;
 385                         NEXT_ARG();
 386                         if (get_integer(&vf,  *argv, 0)) {
 387                                 invarg("Invalid \"vf\" value\n", *argv);
 388                         }
 389                         vflist = addattr_nest(&req->n, sizeof(*req),
 390                                               IFLA_VFINFO_LIST);
 391                         len = iplink_parse_vf(vf, &argc, &argv, req);
 392                         if (len < 0)
 393                                 return -1;
 394                         addattr_nest_end(&req->n, vflist);
 395                 } else if (matches(*argv, "master") == 0) {
 396                         int ifindex;
 397                         NEXT_ARG();
 398                         ifindex = ll_name_to_index(*argv);
 399                         if (!ifindex)
 400                                 invarg("Device does not exist\n", *argv);
 401                         addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
 402                                   &ifindex, 4);
 403                 } else if (matches(*argv, "nomaster") == 0) {
 404                         int ifindex = 0;
 405                         addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
 406                                   &ifindex, 4);
 407                 } else if (matches(*argv, "dynamic") == 0) {
 408                         NEXT_ARG();
 409                         req->i.ifi_change |= IFF_DYNAMIC;
 410                         if (strcmp(*argv, "on") == 0) {
 411                                 req->i.ifi_flags |= IFF_DYNAMIC;
 412                         } else if (strcmp(*argv, "off") == 0) {
 413                                 req->i.ifi_flags &= ~IFF_DYNAMIC;
 414                         } else
 415                                 return on_off("dynamic");
 416                 } else if (matches(*argv, "type") == 0) {
 417                         NEXT_ARG();
 418                         *type = *argv;
 419                         argc--; argv++;
 420                         break;
 421                 } else if (matches(*argv, "alias") == 0) {
 422                         NEXT_ARG();
 423                         addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
 424                                   *argv, strlen(*argv));
 425                         argc--; argv++;
 426                         break;
 427                 } else if (strcmp(*argv, "group") == 0) {
 428                         NEXT_ARG();
 429                         if (*group != -1)
 430                                 duparg("group", *argv);
 431                         if (rtnl_group_a2n(group, *argv))
 432                                 invarg("Invalid \"group\" value\n", *argv);
 433                 } else if (strcmp(*argv, "mode") == 0) {
 434                         int mode;
 435                         NEXT_ARG();
 436                         mode  = get_link_mode(*argv);
 437                         if (mode < 0)
 438                                 invarg("Invalid link mode\n", *argv);
 439                         addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
 440                 } else {
 441                         if (strcmp(*argv, "dev") == 0) {
 442                                 NEXT_ARG();
 443                         }
 444                         if (matches(*argv, "help") == 0)
 445                                 usage();
 446                         if (*dev)
 447                                 duparg2("dev", *argv);
 448                         *dev = *argv;
 449                 }
 450                 argc--; argv++;
 451         }
 452
 453         return ret - argc;
 454 }
 455
 456 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 457 {
 458         int len;
 459         char *dev = NULL;
 460         char *name = NULL;
 461         char *link = NULL;
 462         char *type = NULL;
 463         int group;
 464         struct link_util *lu = NULL;
 465         struct iplink_req req;
 466         int ret;
 467
 468         memset(&req, 0, sizeof(req));
 469
 470         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 471         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 472         req.n.nlmsg_type = cmd;
 473         req.i.ifi_family = preferred_family;
 474
 475         ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group);
 476         if (ret < 0)
 477                 return ret;
 478
 479         argc -= ret;
 480         argv += ret;
 481
 482         if (group != -1) {
 483                 if (dev)
 484                         addattr_l(&req.n, sizeof(req), IFLA_GROUP,
 485                                         &group, sizeof(group));
 486                 else {
 487                         if (argc) {
 488                                 fprintf(stderr, "Garbage instead of arguments "
 489                                                 "\"%s ...\". Try \"ip link "
 490                                                 "help\".\n", *argv);
 491                                 return -1;
 492                         }
 493                         if (flags & NLM_F_CREATE) {
 494                                 fprintf(stderr, "group cannot be used when "
 495                                                 "creating devices.\n");
 496                                 return -1;
 497                         }
 498
 499                         req.i.ifi_index = 0;
 500                         addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
 501                         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 502                                 exit(2);
 503                         return 0;
 504                 }
 505         }
 506
 507         ll_init_map(&rth);
 508
 509         if (!(flags & NLM_F_CREATE)) {
 510                 if (!dev) {
 511                         fprintf(stderr, "Not enough information: \"dev\" "
 512                                         "argument is required.\n");
 513                         exit(-1);
 514                 }
 515
 516                 req.i.ifi_index = ll_name_to_index(dev);
 517                 if (req.i.ifi_index == 0) {
 518                         fprintf(stderr, "Cannot find device \"%s\"\n", dev);
 519                         return -1;
 520                 }
 521         } else {
 522                 /* Allow "ip link add dev" and "ip link add name" */
 523                 if (!name)
 524                         name = dev;
 525
 526                 if (link) {
 527                         int ifindex;
 528
 529                         ifindex = ll_name_to_index(link);
 530                         if (ifindex == 0) {
 531                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 532                                         link);
 533                                 return -1;
 534                         }
 535                         addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
 536                 }
 537         }
 538
 539         if (name) {
 540                 len = strlen(name) + 1;
 541                 if (len == 1)
 542                         invarg("\"\" is not a valid device identifier\n", "name");
 543                 if (len > IFNAMSIZ)
 544                         invarg("\"name\" too long\n", name);
 545                 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
 546         }
 547
 548         if (type) {
 549                 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
 550                 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
 551                 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
 552                          strlen(type));
 553
 554                 lu = get_link_kind(type);
 555                 if (lu && argc) {
 556                         struct rtattr * data = NLMSG_TAIL(&req.n);
 557                         addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
 558
 559                         if (lu->parse_opt &&
 560                             lu->parse_opt(lu, argc, argv, &req.n))
 561                                 return -1;
 562
 563                         data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
 564                 } else if (argc) {
 565                         if (matches(*argv, "help") == 0)
 566                                 usage();
 567                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
 568                                         "Try \"ip link help\".\n", *argv);
 569                         return -1;
 570                 }
 571                 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
 572         } else if (flags & NLM_F_CREATE) {
 573                 fprintf(stderr, "Not enough information: \"type\" argument "
 574                                 "is required\n");
 575                 return -1;
 576         }
 577
 578         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 579                 exit(2);
 580
 581         return 0;
 582 }
 583
 584 #if IPLINK_IOCTL_COMPAT
 585 static int get_ctl_fd(void)
 586 {
 587         int s_errno;
 588         int fd;
 589
 590         fd = socket(PF_INET, SOCK_DGRAM, 0);
 591         if (fd >= 0)
 592                 return fd;
 593         s_errno = errno;
 594         fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 595         if (fd >= 0)
 596                 return fd;
 597         fd = socket(PF_INET6, SOCK_DGRAM, 0);
 598         if (fd >= 0)
 599                 return fd;
 600         errno = s_errno;
 601         perror("Cannot create control socket");
 602         return -1;
 603 }
 604
 605 static int do_chflags(const char *dev, __u32 flags, __u32 mask)
 606 {
 607         struct ifreq ifr;
 608         int fd;
 609         int err;
 610
 611         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 612         fd = get_ctl_fd();
 613         if (fd < 0)
 614                 return -1;
 615         err = ioctl(fd, SIOCGIFFLAGS, &ifr);
 616         if (err) {
 617                 perror("SIOCGIFFLAGS");
 618                 close(fd);
 619                 return -1;
 620         }
 621         if ((ifr.ifr_flags^flags)&mask) {
 622                 ifr.ifr_flags &= ~mask;
 623                 ifr.ifr_flags |= mask&flags;
 624                 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
 625                 if (err)
 626                         perror("SIOCSIFFLAGS");
 627         }
 628         close(fd);
 629         return err;
 630 }
 631
 632 static int do_changename(const char *dev, const char *newdev)
 633 {
 634         struct ifreq ifr;
 635         int fd;
 636         int err;
 637
 638         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 639         strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
 640         fd = get_ctl_fd();
 641         if (fd < 0)
 642                 return -1;
 643         err = ioctl(fd, SIOCSIFNAME, &ifr);
 644         if (err) {
 645                 perror("SIOCSIFNAME");
 646                 close(fd);
 647                 return -1;
 648         }
 649         close(fd);
 650         return err;
 651 }
 652
 653 static int set_qlen(const char *dev, int qlen)
 654 {
 655         struct ifreq ifr;
 656         int s;
 657
 658         s = get_ctl_fd();
 659         if (s < 0)
 660                 return -1;
 661
 662         memset(&ifr, 0, sizeof(ifr));
 663         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 664         ifr.ifr_qlen = qlen;
 665         if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
 666                 perror("SIOCSIFXQLEN");
 667                 close(s);
 668                 return -1;
 669         }
 670         close(s);
 671
 672         return 0;
 673 }
 674
 675 static int set_mtu(const char *dev, int mtu)
 676 {
 677         struct ifreq ifr;
 678         int s;
 679
 680         s = get_ctl_fd();
 681         if (s < 0)
 682                 return -1;
 683
 684         memset(&ifr, 0, sizeof(ifr));
 685         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 686         ifr.ifr_mtu = mtu;
 687         if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
 688                 perror("SIOCSIFMTU");
 689                 close(s);
 690                 return -1;
 691         }
 692         close(s);
 693
 694         return 0;
 695 }
 696
 697 static int get_address(const char *dev, int *htype)
 698 {
 699         struct ifreq ifr;
 700         struct sockaddr_ll me;
 701         socklen_t alen;
 702         int s;
 703
 704         s = socket(PF_PACKET, SOCK_DGRAM, 0);
 705         if (s < 0) {
 706                 perror("socket(PF_PACKET)");
 707                 return -1;
 708         }
 709
 710         memset(&ifr, 0, sizeof(ifr));
 711         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 712         if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 713                 perror("SIOCGIFINDEX");
 714                 close(s);
 715                 return -1;
 716         }
 717
 718         memset(&me, 0, sizeof(me));
 719         me.sll_family = AF_PACKET;
 720         me.sll_ifindex = ifr.ifr_ifindex;
 721         me.sll_protocol = htons(ETH_P_LOOP);
 722         if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 723                 perror("bind");
 724                 close(s);
 725                 return -1;
 726         }
 727
 728         alen = sizeof(me);
 729         if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
 730                 perror("getsockname");
 731                 close(s);
 732                 return -1;
 733         }
 734         close(s);
 735         *htype = me.sll_hatype;
 736         return me.sll_halen;
 737 }
 738
 739 static int parse_address(const char *dev, int hatype, int halen,
 740                 char *lla, struct ifreq *ifr)
 741 {
 742         int alen;
 743
 744         memset(ifr, 0, sizeof(*ifr));
 745         strncpy(ifr->ifr_name, dev, IFNAMSIZ);
 746         ifr->ifr_hwaddr.sa_family = hatype;
 747         alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
 748         if (alen < 0)
 749                 return -1;
 750         if (alen != halen) {
 751                 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
 752                 return -1;
 753         }
 754         return 0;
 755 }
 756
 757 static int set_address(struct ifreq *ifr, int brd)
 758 {
 759         int s;
 760
 761         s = get_ctl_fd();
 762         if (s < 0)
 763                 return -1;
 764         if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
 765                 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
 766                 close(s);
 767                 return -1;
 768         }
 769         close(s);
 770         return 0;
 771 }
 772
 773
 774 static int do_set(int argc, char **argv)
 775 {
 776         char *dev = NULL;
 777         __u32 mask = 0;
 778         __u32 flags = 0;
 779         int qlen = -1;
 780         int mtu = -1;
 781         char *newaddr = NULL;
 782         char *newbrd = NULL;
 783         struct ifreq ifr0, ifr1;
 784         char *newname = NULL;
 785         int htype, halen;
 786
 787         while (argc > 0) {
 788                 if (strcmp(*argv, "up") == 0) {
 789                         mask |= IFF_UP;
 790                         flags |= IFF_UP;
 791                 } else if (strcmp(*argv, "down") == 0) {
 792                         mask |= IFF_UP;
 793                         flags &= ~IFF_UP;
 794                 } else if (strcmp(*argv, "name") == 0) {
 795                         NEXT_ARG();
 796                         newname = *argv;
 797                 } else if (matches(*argv, "address") == 0) {
 798                         NEXT_ARG();
 799                         newaddr = *argv;
 800                 } else if (matches(*argv, "broadcast") == 0 ||
 801                            strcmp(*argv, "brd") == 0) {
 802                         NEXT_ARG();
 803                         newbrd = *argv;
 804                 } else if (matches(*argv, "txqueuelen") == 0 ||
 805                            strcmp(*argv, "qlen") == 0 ||
 806                            matches(*argv, "txqlen") == 0) {
 807                         NEXT_ARG();
 808                         if (qlen != -1)
 809                                 duparg("txqueuelen", *argv);
 810                         if (get_integer(&qlen,  *argv, 0))
 811                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 812                 } else if (strcmp(*argv, "mtu") == 0) {
 813                         NEXT_ARG();
 814                         if (mtu != -1)
 815                                 duparg("mtu", *argv);
 816                         if (get_integer(&mtu, *argv, 0))
 817                                 invarg("Invalid \"mtu\" value\n", *argv);
 818                 } else if (strcmp(*argv, "multicast") == 0) {
 819                         NEXT_ARG();
 820                         mask |= IFF_MULTICAST;
 821                         if (strcmp(*argv, "on") == 0) {
 822                                 flags |= IFF_MULTICAST;
 823                         } else if (strcmp(*argv, "off") == 0) {
 824                                 flags &= ~IFF_MULTICAST;
 825                         } else
 826                                 return on_off("multicast");
 827                 } else if (strcmp(*argv, "allmulticast") == 0) {
 828                         NEXT_ARG();
 829                         mask |= IFF_ALLMULTI;
 830                         if (strcmp(*argv, "on") == 0) {
 831                                 flags |= IFF_ALLMULTI;
 832                         } else if (strcmp(*argv, "off") == 0) {
 833                                 flags &= ~IFF_ALLMULTI;
 834                         } else
 835                                 return on_off("allmulticast");
 836                 } else if (strcmp(*argv, "promisc") == 0) {
 837                         NEXT_ARG();
 838                         mask |= IFF_PROMISC;
 839                         if (strcmp(*argv, "on") == 0) {
 840                                 flags |= IFF_PROMISC;
 841                         } else if (strcmp(*argv, "off") == 0) {
 842                                 flags &= ~IFF_PROMISC;
 843                         } else
 844                                 return on_off("promisc");
 845                 } else if (strcmp(*argv, "trailers") == 0) {
 846                         NEXT_ARG();
 847                         mask |= IFF_NOTRAILERS;
 848                         if (strcmp(*argv, "off") == 0) {
 849                                 flags |= IFF_NOTRAILERS;
 850                         } else if (strcmp(*argv, "on") == 0) {
 851                                 flags &= ~IFF_NOTRAILERS;
 852                         } else
 853                                 return on_off("trailers");
 854                 } else if (strcmp(*argv, "arp") == 0) {
 855                         NEXT_ARG();
 856                         mask |= IFF_NOARP;
 857                         if (strcmp(*argv, "on") == 0) {
 858                                 flags &= ~IFF_NOARP;
 859                         } else if (strcmp(*argv, "off") == 0) {
 860                                 flags |= IFF_NOARP;
 861                         } else
 862                                 return on_off("noarp");
 863                 } else if (matches(*argv, "dynamic") == 0) {
 864                         NEXT_ARG();
 865                         mask |= IFF_DYNAMIC;
 866                         if (strcmp(*argv, "on") == 0) {
 867                                 flags |= IFF_DYNAMIC;
 868                         } else if (strcmp(*argv, "off") == 0) {
 869                                 flags &= ~IFF_DYNAMIC;
 870                         } else
 871                                 return on_off("dynamic");
 872                 } else {
 873                         if (strcmp(*argv, "dev") == 0) {
 874                                 NEXT_ARG();
 875                         }
 876                         if (matches(*argv, "help") == 0)
 877                                 usage();
 878                         if (dev)
 879                                 duparg2("dev", *argv);
 880                         dev = *argv;
 881                 }
 882                 argc--; argv++;
 883         }
 884
 885         if (!dev) {
 886                 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
 887                 exit(-1);
 888         }
 889
 890         if (newaddr || newbrd) {
 891                 halen = get_address(dev, &htype);
 892                 if (halen < 0)
 893                         return -1;
 894                 if (newaddr) {
 895                         if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
 896                                 return -1;
 897                 }
 898                 if (newbrd) {
 899                         if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
 900                                 return -1;
 901                 }
 902         }
 903
 904         if (newname && strcmp(dev, newname)) {
 905                 if (strlen(newname) == 0)
 906                         invarg("\"\" is not a valid device identifier\n", "name");
 907                 if (do_changename(dev, newname) < 0)
 908                         return -1;
 909                 dev = newname;
 910         }
 911         if (qlen != -1) {
 912                 if (set_qlen(dev, qlen) < 0)
 913                         return -1;
 914         }
 915         if (mtu != -1) {
 916                 if (set_mtu(dev, mtu) < 0)
 917                         return -1;
 918         }
 919         if (newaddr || newbrd) {
 920                 if (newbrd) {
 921                         if (set_address(&ifr1, 1) < 0)
 922                                 return -1;
 923                 }
 924                 if (newaddr) {
 925                         if (set_address(&ifr0, 0) < 0)
 926                                 return -1;
 927                 }
 928         }
 929         if (mask)
 930                 return do_chflags(dev, flags, mask);
 931         return 0;
 932 }
 933 #endif /* IPLINK_IOCTL_COMPAT */
 934
 935 int do_iplink(int argc, char **argv)
 936 {
 937         if (argc > 0) {
 938                 if (iplink_have_newlink()) {
 939                         if (matches(*argv, "add") == 0)
 940                                 return iplink_modify(RTM_NEWLINK,
 941                                                      NLM_F_CREATE|NLM_F_EXCL,
 942                                                      argc-1, argv+1);
 943                         if (matches(*argv, "set") == 0 ||
 944                             matches(*argv, "change") == 0)
 945                                 return iplink_modify(RTM_NEWLINK, 0,
 946                                                      argc-1, argv+1);
 947                         if (matches(*argv, "replace") == 0)
 948                                 return iplink_modify(RTM_NEWLINK,
 949                                                      NLM_F_CREATE|NLM_F_REPLACE,
 950                                                      argc-1, argv+1);
 951                         if (matches(*argv, "delete") == 0)
 952                                 return iplink_modify(RTM_DELLINK, 0,
 953                                                      argc-1, argv+1);
 954                 } else {
 955 #if IPLINK_IOCTL_COMPAT
 956                         if (matches(*argv, "set") == 0)
 957                                 return do_set(argc-1, argv+1);
 958 #endif
 959                 }
 960                 if (matches(*argv, "show") == 0 ||
 961                     matches(*argv, "lst") == 0 ||
 962                     matches(*argv, "list") == 0)
 963                         return ipaddr_list_link(argc-1, argv+1);
 964                 if (matches(*argv, "help") == 0)
 965                         usage();
 966         } else
 967                 return ipaddr_list_link(0, NULL);
 968
 969         fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
 970         exit(-1);
 971 }