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, "                   [ numtxqueues QUEUE_COUNT ]\n");
  52                 fprintf(stderr, "                   [ numrxqueues QUEUE_COUNT ]\n");
  53                 fprintf(stderr, "                   type TYPE [ ARGS ]\n");
  54                 fprintf(stderr, "       ip link delete DEV type TYPE [ ARGS ]\n");
  55                 fprintf(stderr, "\n");
  56                 fprintf(stderr, "       ip link set { dev DEVICE | group DEVGROUP } [ { up | down } ]\n");
  57         } else
  58                 fprintf(stderr, "Usage: ip link set DEVICE [ { up | down } ]\n");
  59
  60         fprintf(stderr, "                         [ arp { on | off } ]\n");
  61         fprintf(stderr, "                         [ dynamic { on | off } ]\n");
  62         fprintf(stderr, "                         [ multicast { on | off } ]\n");
  63         fprintf(stderr, "                         [ allmulticast { on | off } ]\n");
  64         fprintf(stderr, "                         [ promisc { on | off } ]\n");
  65         fprintf(stderr, "                         [ trailers { on | off } ]\n");
  66         fprintf(stderr, "                         [ txqueuelen PACKETS ]\n");
  67         fprintf(stderr, "                         [ name NEWNAME ]\n");
  68         fprintf(stderr, "                         [ address LLADDR ]\n");
  69         fprintf(stderr, "                         [ broadcast LLADDR ]\n");
  70         fprintf(stderr, "                         [ mtu MTU ]\n");
  71         fprintf(stderr, "                         [ netns PID ]\n");
  72         fprintf(stderr, "                         [ netns NAME ]\n");
  73         fprintf(stderr, "                         [ alias NAME ]\n");
  74         fprintf(stderr, "                         [ vf NUM [ mac LLADDR ]\n");
  75         fprintf(stderr, "                                  [ vlan VLANID [ qos VLAN-QOS ] ]\n");
  76
  77         fprintf(stderr, "                                  [ rate TXRATE ] ] \n");
  78
  79         fprintf(stderr, "                                  [ spoofchk { on | off} ] ] \n");
  80         fprintf(stderr, "                                  [ state { auto | enable | disable} ] ]\n");
  81         fprintf(stderr, "                         [ master DEVICE ]\n");
  82         fprintf(stderr, "                         [ nomaster ]\n");
  83         fprintf(stderr, "       ip link show [ DEVICE | group GROUP ] [up]\n");
  84
  85         if (iplink_have_newlink()) {
  86                 fprintf(stderr, "\n");
  87                 fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |\n");
  88                 fprintf(stderr, "          can | bridge | bond | ipoib | ip6tnl | ipip | sit |\n");
  89                 fprintf(stderr, "          vxlan | gre | gretap | ip6gre | ip6gretap | vti }\n");
  90         }
  91         exit(-1);
  92 }
  93
  94 static void usage(void)
  95 {
  96         iplink_usage();
  97 }
  98
  99 static int on_off(const char *msg, const char *realval)
 100 {
 101         fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, realval);
 102         return -1;
 103 }
 104
 105 static void *BODY;              /* cached dlopen(NULL) handle */
 106 static struct link_util *linkutil_list;
 107
 108 struct link_util *get_link_kind(const char *id)
 109 {
 110         void *dlh;
 111         char buf[256];
 112         struct link_util *l;
 113
 114         for (l = linkutil_list; l; l = l->next)
 115                 if (strcmp(l->id, id) == 0)
 116                         return l;
 117
 118         snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
 119         dlh = dlopen(buf, RTLD_LAZY);
 120         if (dlh == NULL) {
 121                 /* look in current binary, only open once */
 122                 dlh = BODY;
 123                 if (dlh == NULL) {
 124                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
 125                         if (dlh == NULL)
 126                                 return NULL;
 127                 }
 128         }
 129
 130         snprintf(buf, sizeof(buf), "%s_link_util", id);
 131         l = dlsym(dlh, buf);
 132         if (l == NULL)
 133                 return NULL;
 134
 135         l->next = linkutil_list;
 136         linkutil_list = l;
 137         return l;
 138 }
 139
 140 static int get_link_mode(const char *mode)
 141 {
 142         if (strcasecmp(mode, "default") == 0)
 143                 return IF_LINK_MODE_DEFAULT;
 144         if (strcasecmp(mode, "dormant") == 0)
 145                 return IF_LINK_MODE_DORMANT;
 146         return -1;
 147 }
 148
 149 #if IPLINK_IOCTL_COMPAT
 150 static int have_rtnl_newlink = -1;
 151
 152 static int accept_msg(const struct sockaddr_nl *who,
 153                       struct nlmsghdr *n, void *arg)
 154 {
 155         struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
 156
 157         if (n->nlmsg_type == NLMSG_ERROR &&
 158             (err->error == -EOPNOTSUPP || err->error == -EINVAL))
 159                 have_rtnl_newlink = 0;
 160         else
 161                 have_rtnl_newlink = 1;
 162         return -1;
 163 }
 164
 165 static int iplink_have_newlink(void)
 166 {
 167         struct {
 168                 struct nlmsghdr         n;
 169                 struct ifinfomsg        i;
 170                 char                    buf[1024];
 171         } req;
 172
 173         if (have_rtnl_newlink < 0) {
 174                 memset(&req, 0, sizeof(req));
 175
 176                 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 177                 req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
 178                 req.n.nlmsg_type = RTM_NEWLINK;
 179                 req.i.ifi_family = AF_UNSPEC;
 180
 181                 rtnl_send(&rth, &req.n, req.n.nlmsg_len);
 182                 rtnl_listen(&rth, accept_msg, NULL);
 183         }
 184         return have_rtnl_newlink;
 185 }
 186 #else /* IPLINK_IOCTL_COMPAT */
 187 static int iplink_have_newlink(void)
 188 {
 189         return 1;
 190 }
 191 #endif /* ! IPLINK_IOCTL_COMPAT */
 192
 193 struct iplink_req {
 194         struct nlmsghdr         n;
 195         struct ifinfomsg        i;
 196         char                    buf[1024];
 197 };
 198
 199 static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
 200                            struct iplink_req *req)
 201 {
 202         int len, argc = *argcp;
 203         char **argv = *argvp;
 204         struct rtattr *vfinfo;
 205
 206         vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
 207
 208         while (NEXT_ARG_OK()) {
 209                 NEXT_ARG();
 210                 if (matches(*argv, "mac") == 0) {
 211                         struct ifla_vf_mac ivm;
 212                         NEXT_ARG();
 213                         ivm.vf = vf;
 214                         len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
 215                         if (len < 0)
 216                                 return -1;
 217                         addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
 218                 } else if (matches(*argv, "vlan") == 0) {
 219                         struct ifla_vf_vlan ivv;
 220                         NEXT_ARG();
 221                         if (get_unsigned(&ivv.vlan, *argv, 0)) {
 222                                 invarg("Invalid \"vlan\" value\n", *argv);
 223                         }
 224                         ivv.vf = vf;
 225                         ivv.qos = 0;
 226                         if (NEXT_ARG_OK()) {
 227                                 NEXT_ARG();
 228                                 if (matches(*argv, "qos") == 0) {
 229                                         NEXT_ARG();
 230                                         if (get_unsigned(&ivv.qos, *argv, 0)) {
 231                                                 invarg("Invalid \"qos\" value\n", *argv);
 232                                         }
 233                                 } else {
 234                                         /* rewind arg */
 235                                         PREV_ARG();
 236                                 }
 237                         }
 238                         addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
 239                 } else if (matches(*argv, "rate") == 0) {
 240                         struct ifla_vf_tx_rate ivt;
 241                         NEXT_ARG();
 242                         if (get_unsigned(&ivt.rate, *argv, 0)) {
 243                                 invarg("Invalid \"rate\" value\n", *argv);
 244                         }
 245                         ivt.vf = vf;
 246                         addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
 247
 248                 } else if (matches(*argv, "spoofchk") == 0) {
 249                         struct ifla_vf_spoofchk ivs;
 250                         NEXT_ARG();
 251                         if (matches(*argv, "on") == 0)
 252                                 ivs.setting = 1;
 253                         else if (matches(*argv, "off") == 0)
 254                                 ivs.setting = 0;
 255                         else
 256                                 invarg("Invalid \"spoofchk\" value\n", *argv);
 257                         ivs.vf = vf;
 258                         addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
 259
 260                 } else if (matches(*argv, "state") == 0) {
 261                         struct ifla_vf_link_state ivl;
 262                         NEXT_ARG();
 263                         if (matches(*argv, "auto") == 0)
 264                                 ivl.link_state = IFLA_VF_LINK_STATE_AUTO;
 265                         else if (matches(*argv, "enable") == 0)
 266                                 ivl.link_state = IFLA_VF_LINK_STATE_ENABLE;
 267                         else if (matches(*argv, "disable") == 0)
 268                                 ivl.link_state = IFLA_VF_LINK_STATE_DISABLE;
 269                         else
 270                                 invarg("Invalid \"state\" value\n", *argv);
 271                         ivl.vf = vf;
 272                         addattr_l(&req->n, sizeof(*req), IFLA_VF_LINK_STATE, &ivl, sizeof(ivl));
 273                 } else {
 274                         /* rewind arg */
 275                         PREV_ARG();
 276                         break;
 277                 }
 278         }
 279
 280         if (argc == *argcp)
 281                 incomplete_command();
 282
 283         addattr_nest_end(&req->n, vfinfo);
 284
 285         *argcp = argc;
 286         *argvp = argv;
 287         return 0;
 288 }
 289
 290 int iplink_parse(int argc, char **argv, struct iplink_req *req,
 291                 char **name, char **type, char **link, char **dev, int *group)
 292 {
 293         int ret, len;
 294         char abuf[32];
 295         int qlen = -1;
 296         int mtu = -1;
 297         int netns = -1;
 298         int vf = -1;
 299         int numtxqueues = -1;
 300         int numrxqueues = -1;
 301
 302         *group = -1;
 303         ret = argc;
 304
 305         while (argc > 0) {
 306                 if (strcmp(*argv, "up") == 0) {
 307                         req->i.ifi_change |= IFF_UP;
 308                         req->i.ifi_flags |= IFF_UP;
 309                 } else if (strcmp(*argv, "down") == 0) {
 310                         req->i.ifi_change |= IFF_UP;
 311                         req->i.ifi_flags &= ~IFF_UP;
 312                 } else if (strcmp(*argv, "name") == 0) {
 313                         NEXT_ARG();
 314                         *name = *argv;
 315                 } else if (matches(*argv, "link") == 0) {
 316                         NEXT_ARG();
 317                         *link = *argv;
 318                 } else if (matches(*argv, "address") == 0) {
 319                         NEXT_ARG();
 320                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 321                         if (len < 0)
 322                                 return -1;
 323                         addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
 324                 } else if (matches(*argv, "broadcast") == 0 ||
 325                                 strcmp(*argv, "brd") == 0) {
 326                         NEXT_ARG();
 327                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 328                         if (len < 0)
 329                                 return -1;
 330                         addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
 331                 } else if (matches(*argv, "txqueuelen") == 0 ||
 332                                 strcmp(*argv, "qlen") == 0 ||
 333                                 matches(*argv, "txqlen") == 0) {
 334                         NEXT_ARG();
 335                         if (qlen != -1)
 336                                 duparg("txqueuelen", *argv);
 337                         if (get_integer(&qlen,  *argv, 0))
 338                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 339                         addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
 340                 } else if (strcmp(*argv, "mtu") == 0) {
 341                         NEXT_ARG();
 342                         if (mtu != -1)
 343                                 duparg("mtu", *argv);
 344                         if (get_integer(&mtu, *argv, 0))
 345                                 invarg("Invalid \"mtu\" value\n", *argv);
 346                         addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
 347                 } else if (strcmp(*argv, "netns") == 0) {
 348                         NEXT_ARG();
 349                         if (netns != -1)
 350                                 duparg("netns", *argv);
 351                         if ((netns = get_netns_fd(*argv)) >= 0)
 352                                 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
 353                         else if (get_integer(&netns, *argv, 0) == 0)
 354                                 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
 355                         else
 356                                 invarg("Invalid \"netns\" value\n", *argv);
 357                 } else if (strcmp(*argv, "multicast") == 0) {
 358                         NEXT_ARG();
 359                         req->i.ifi_change |= IFF_MULTICAST;
 360                         if (strcmp(*argv, "on") == 0) {
 361                                 req->i.ifi_flags |= IFF_MULTICAST;
 362                         } else if (strcmp(*argv, "off") == 0) {
 363                                 req->i.ifi_flags &= ~IFF_MULTICAST;
 364                         } else
 365                                 return on_off("multicast", *argv);
 366                 } else if (strcmp(*argv, "allmulticast") == 0) {
 367                         NEXT_ARG();
 368                         req->i.ifi_change |= IFF_ALLMULTI;
 369                         if (strcmp(*argv, "on") == 0) {
 370                                 req->i.ifi_flags |= IFF_ALLMULTI;
 371                         } else if (strcmp(*argv, "off") == 0) {
 372                                 req->i.ifi_flags &= ~IFF_ALLMULTI;
 373                         } else
 374                                 return on_off("allmulticast", *argv);
 375                 } else if (strcmp(*argv, "promisc") == 0) {
 376                         NEXT_ARG();
 377                         req->i.ifi_change |= IFF_PROMISC;
 378                         if (strcmp(*argv, "on") == 0) {
 379                                 req->i.ifi_flags |= IFF_PROMISC;
 380                         } else if (strcmp(*argv, "off") == 0) {
 381                                 req->i.ifi_flags &= ~IFF_PROMISC;
 382                         } else
 383                                 return on_off("promisc", *argv);
 384                 } else if (strcmp(*argv, "trailers") == 0) {
 385                         NEXT_ARG();
 386                         req->i.ifi_change |= IFF_NOTRAILERS;
 387                         if (strcmp(*argv, "off") == 0) {
 388                                 req->i.ifi_flags |= IFF_NOTRAILERS;
 389                         } else if (strcmp(*argv, "on") == 0) {
 390                                 req->i.ifi_flags &= ~IFF_NOTRAILERS;
 391                         } else
 392                                 return on_off("trailers", *argv);
 393                 } else if (strcmp(*argv, "arp") == 0) {
 394                         NEXT_ARG();
 395                         req->i.ifi_change |= IFF_NOARP;
 396                         if (strcmp(*argv, "on") == 0) {
 397                                 req->i.ifi_flags &= ~IFF_NOARP;
 398                         } else if (strcmp(*argv, "off") == 0) {
 399                                 req->i.ifi_flags |= IFF_NOARP;
 400                         } else
 401                                 return on_off("noarp", *argv);
 402                 } else if (strcmp(*argv, "vf") == 0) {
 403                         struct rtattr *vflist;
 404                         NEXT_ARG();
 405                         if (get_integer(&vf,  *argv, 0)) {
 406                                 invarg("Invalid \"vf\" value\n", *argv);
 407                         }
 408                         vflist = addattr_nest(&req->n, sizeof(*req),
 409                                               IFLA_VFINFO_LIST);
 410                         len = iplink_parse_vf(vf, &argc, &argv, req);
 411                         if (len < 0)
 412                                 return -1;
 413                         addattr_nest_end(&req->n, vflist);
 414                 } else if (matches(*argv, "master") == 0) {
 415                         int ifindex;
 416                         NEXT_ARG();
 417                         ifindex = ll_name_to_index(*argv);
 418                         if (!ifindex)
 419                                 invarg("Device does not exist\n", *argv);
 420                         addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
 421                                   &ifindex, 4);
 422                 } else if (matches(*argv, "nomaster") == 0) {
 423                         int ifindex = 0;
 424                         addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
 425                                   &ifindex, 4);
 426                 } else if (matches(*argv, "dynamic") == 0) {
 427                         NEXT_ARG();
 428                         req->i.ifi_change |= IFF_DYNAMIC;
 429                         if (strcmp(*argv, "on") == 0) {
 430                                 req->i.ifi_flags |= IFF_DYNAMIC;
 431                         } else if (strcmp(*argv, "off") == 0) {
 432                                 req->i.ifi_flags &= ~IFF_DYNAMIC;
 433                         } else
 434                                 return on_off("dynamic", *argv);
 435                 } else if (matches(*argv, "type") == 0) {
 436                         NEXT_ARG();
 437                         *type = *argv;
 438                         argc--; argv++;
 439                         break;
 440                 } else if (matches(*argv, "alias") == 0) {
 441                         NEXT_ARG();
 442                         addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
 443                                   *argv, strlen(*argv));
 444                         argc--; argv++;
 445                         break;
 446                 } else if (strcmp(*argv, "group") == 0) {
 447                         NEXT_ARG();
 448                         if (*group != -1)
 449                                 duparg("group", *argv);
 450                         if (rtnl_group_a2n(group, *argv))
 451                                 invarg("Invalid \"group\" value\n", *argv);
 452                 } else if (strcmp(*argv, "mode") == 0) {
 453                         int mode;
 454                         NEXT_ARG();
 455                         mode = get_link_mode(*argv);
 456                         if (mode < 0)
 457                                 invarg("Invalid link mode\n", *argv);
 458                         addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
 459                 } else if (strcmp(*argv, "state") == 0) {
 460                         int state;
 461                         NEXT_ARG();
 462                         state = get_operstate(*argv);
 463                         if (state < 0)
 464                                 invarg("Invalid operstate\n", *argv);
 465
 466                         addattr8(&req->n, sizeof(*req), IFLA_OPERSTATE, state);
 467                 } else if (matches(*argv, "numtxqueues") == 0) {
 468                         NEXT_ARG();
 469                         if (numtxqueues != -1)
 470                                 duparg("numtxqueues", *argv);
 471                         if (get_integer(&numtxqueues, *argv, 0))
 472                                 invarg("Invalid \"numtxqueues\" value\n", *argv);
 473                         addattr_l(&req->n, sizeof(*req), IFLA_NUM_TX_QUEUES,
 474                                   &numtxqueues, 4);
 475                 } else if (matches(*argv, "numrxqueues") == 0) {
 476                         NEXT_ARG();
 477                         if (numrxqueues != -1)
 478                                 duparg("numrxqueues", *argv);
 479                         if (get_integer(&numrxqueues, *argv, 0))
 480                                 invarg("Invalid \"numrxqueues\" value\n", *argv);
 481                         addattr_l(&req->n, sizeof(*req), IFLA_NUM_RX_QUEUES,
 482                                   &numrxqueues, 4);
 483                 } else {
 484                         if (strcmp(*argv, "dev") == 0) {
 485                                 NEXT_ARG();
 486                         }
 487                         if (matches(*argv, "help") == 0)
 488                                 usage();
 489                         if (*dev)
 490                                 duparg2("dev", *argv);
 491                         *dev = *argv;
 492                 }
 493                 argc--; argv++;
 494         }
 495
 496         return ret - argc;
 497 }
 498
 499 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 500 {
 501         int len;
 502         char *dev = NULL;
 503         char *name = NULL;
 504         char *link = NULL;
 505         char *type = NULL;
 506         int group;
 507         struct link_util *lu = NULL;
 508         struct iplink_req req;
 509         int ret;
 510
 511         memset(&req, 0, sizeof(req));
 512
 513         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 514         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 515         req.n.nlmsg_type = cmd;
 516         req.i.ifi_family = preferred_family;
 517
 518         ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group);
 519         if (ret < 0)
 520                 return ret;
 521
 522         argc -= ret;
 523         argv += ret;
 524
 525         if (group != -1) {
 526                 if (dev)
 527                         addattr_l(&req.n, sizeof(req), IFLA_GROUP,
 528                                         &group, sizeof(group));
 529                 else {
 530                         if (argc) {
 531                                 fprintf(stderr, "Garbage instead of arguments "
 532                                                 "\"%s ...\". Try \"ip link "
 533                                                 "help\".\n", *argv);
 534                                 return -1;
 535                         }
 536                         if (flags & NLM_F_CREATE) {
 537                                 fprintf(stderr, "group cannot be used when "
 538                                                 "creating devices.\n");
 539                                 return -1;
 540                         }
 541
 542                         req.i.ifi_index = 0;
 543                         addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
 544                         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 545                                 exit(2);
 546                         return 0;
 547                 }
 548         }
 549
 550         if (!(flags & NLM_F_CREATE)) {
 551                 if (!dev) {
 552                         fprintf(stderr, "Not enough information: \"dev\" "
 553                                         "argument is required.\n");
 554                         exit(-1);
 555                 }
 556
 557                 req.i.ifi_index = ll_name_to_index(dev);
 558                 if (req.i.ifi_index == 0) {
 559                         fprintf(stderr, "Cannot find device \"%s\"\n", dev);
 560                         return -1;
 561                 }
 562         } else {
 563                 /* Allow "ip link add dev" and "ip link add name" */
 564                 if (!name)
 565                         name = dev;
 566
 567                 if (link) {
 568                         int ifindex;
 569
 570                         ifindex = ll_name_to_index(link);
 571                         if (ifindex == 0) {
 572                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 573                                         link);
 574                                 return -1;
 575                         }
 576                         addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
 577                 }
 578         }
 579
 580         if (name) {
 581                 len = strlen(name) + 1;
 582                 if (len == 1)
 583                         invarg("\"\" is not a valid device identifier\n", "name");
 584                 if (len > IFNAMSIZ)
 585                         invarg("\"name\" too long\n", name);
 586                 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
 587         }
 588
 589         if (type) {
 590                 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
 591                 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
 592                 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
 593                          strlen(type));
 594
 595                 lu = get_link_kind(type);
 596                 if (lu && argc) {
 597                         struct rtattr * data = NLMSG_TAIL(&req.n);
 598                         addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
 599
 600                         if (lu->parse_opt &&
 601                             lu->parse_opt(lu, argc, argv, &req.n))
 602                                 return -1;
 603
 604                         data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
 605                 } else if (argc) {
 606                         if (matches(*argv, "help") == 0)
 607                                 usage();
 608                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
 609                                         "Try \"ip link help\".\n", *argv);
 610                         return -1;
 611                 }
 612                 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
 613         } else if (flags & NLM_F_CREATE) {
 614                 fprintf(stderr, "Not enough information: \"type\" argument "
 615                                 "is required\n");
 616                 return -1;
 617         }
 618
 619         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
 620                 exit(2);
 621
 622         return 0;
 623 }
 624
 625 #if IPLINK_IOCTL_COMPAT
 626 static int get_ctl_fd(void)
 627 {
 628         int s_errno;
 629         int fd;
 630
 631         fd = socket(PF_INET, SOCK_DGRAM, 0);
 632         if (fd >= 0)
 633                 return fd;
 634         s_errno = errno;
 635         fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 636         if (fd >= 0)
 637                 return fd;
 638         fd = socket(PF_INET6, SOCK_DGRAM, 0);
 639         if (fd >= 0)
 640                 return fd;
 641         errno = s_errno;
 642         perror("Cannot create control socket");
 643         return -1;
 644 }
 645
 646 static int do_chflags(const char *dev, __u32 flags, __u32 mask)
 647 {
 648         struct ifreq ifr;
 649         int fd;
 650         int err;
 651
 652         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 653         fd = get_ctl_fd();
 654         if (fd < 0)
 655                 return -1;
 656         err = ioctl(fd, SIOCGIFFLAGS, &ifr);
 657         if (err) {
 658                 perror("SIOCGIFFLAGS");
 659                 close(fd);
 660                 return -1;
 661         }
 662         if ((ifr.ifr_flags^flags)&mask) {
 663                 ifr.ifr_flags &= ~mask;
 664                 ifr.ifr_flags |= mask&flags;
 665                 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
 666                 if (err)
 667                         perror("SIOCSIFFLAGS");
 668         }
 669         close(fd);
 670         return err;
 671 }
 672
 673 static int do_changename(const char *dev, const char *newdev)
 674 {
 675         struct ifreq ifr;
 676         int fd;
 677         int err;
 678
 679         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 680         strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
 681         fd = get_ctl_fd();
 682         if (fd < 0)
 683                 return -1;
 684         err = ioctl(fd, SIOCSIFNAME, &ifr);
 685         if (err) {
 686                 perror("SIOCSIFNAME");
 687                 close(fd);
 688                 return -1;
 689         }
 690         close(fd);
 691         return err;
 692 }
 693
 694 static int set_qlen(const char *dev, int qlen)
 695 {
 696         struct ifreq ifr;
 697         int s;
 698
 699         s = get_ctl_fd();
 700         if (s < 0)
 701                 return -1;
 702
 703         memset(&ifr, 0, sizeof(ifr));
 704         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 705         ifr.ifr_qlen = qlen;
 706         if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
 707                 perror("SIOCSIFXQLEN");
 708                 close(s);
 709                 return -1;
 710         }
 711         close(s);
 712
 713         return 0;
 714 }
 715
 716 static int set_mtu(const char *dev, int mtu)
 717 {
 718         struct ifreq ifr;
 719         int s;
 720
 721         s = get_ctl_fd();
 722         if (s < 0)
 723                 return -1;
 724
 725         memset(&ifr, 0, sizeof(ifr));
 726         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 727         ifr.ifr_mtu = mtu;
 728         if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
 729                 perror("SIOCSIFMTU");
 730                 close(s);
 731                 return -1;
 732         }
 733         close(s);
 734
 735         return 0;
 736 }
 737
 738 static int get_address(const char *dev, int *htype)
 739 {
 740         struct ifreq ifr;
 741         struct sockaddr_ll me;
 742         socklen_t alen;
 743         int s;
 744
 745         s = socket(PF_PACKET, SOCK_DGRAM, 0);
 746         if (s < 0) {
 747                 perror("socket(PF_PACKET)");
 748                 return -1;
 749         }
 750
 751         memset(&ifr, 0, sizeof(ifr));
 752         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 753         if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 754                 perror("SIOCGIFINDEX");
 755                 close(s);
 756                 return -1;
 757         }
 758
 759         memset(&me, 0, sizeof(me));
 760         me.sll_family = AF_PACKET;
 761         me.sll_ifindex = ifr.ifr_ifindex;
 762         me.sll_protocol = htons(ETH_P_LOOP);
 763         if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 764                 perror("bind");
 765                 close(s);
 766                 return -1;
 767         }
 768
 769         alen = sizeof(me);
 770         if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
 771                 perror("getsockname");
 772                 close(s);
 773                 return -1;
 774         }
 775         close(s);
 776         *htype = me.sll_hatype;
 777         return me.sll_halen;
 778 }
 779
 780 static int parse_address(const char *dev, int hatype, int halen,
 781                 char *lla, struct ifreq *ifr)
 782 {
 783         int alen;
 784
 785         memset(ifr, 0, sizeof(*ifr));
 786         strncpy(ifr->ifr_name, dev, IFNAMSIZ);
 787         ifr->ifr_hwaddr.sa_family = hatype;
 788         alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
 789         if (alen < 0)
 790                 return -1;
 791         if (alen != halen) {
 792                 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
 793                 return -1;
 794         }
 795         return 0;
 796 }
 797
 798 static int set_address(struct ifreq *ifr, int brd)
 799 {
 800         int s;
 801
 802         s = get_ctl_fd();
 803         if (s < 0)
 804                 return -1;
 805         if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
 806                 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
 807                 close(s);
 808                 return -1;
 809         }
 810         close(s);
 811         return 0;
 812 }
 813
 814 static int do_set(int argc, char **argv)
 815 {
 816         char *dev = NULL;
 817         __u32 mask = 0;
 818         __u32 flags = 0;
 819         int qlen = -1;
 820         int mtu = -1;
 821         char *newaddr = NULL;
 822         char *newbrd = NULL;
 823         struct ifreq ifr0, ifr1;
 824         char *newname = NULL;
 825         int htype, halen;
 826
 827         while (argc > 0) {
 828                 if (strcmp(*argv, "up") == 0) {
 829                         mask |= IFF_UP;
 830                         flags |= IFF_UP;
 831                 } else if (strcmp(*argv, "down") == 0) {
 832                         mask |= IFF_UP;
 833                         flags &= ~IFF_UP;
 834                 } else if (strcmp(*argv, "name") == 0) {
 835                         NEXT_ARG();
 836                         newname = *argv;
 837                 } else if (matches(*argv, "address") == 0) {
 838                         NEXT_ARG();
 839                         newaddr = *argv;
 840                 } else if (matches(*argv, "broadcast") == 0 ||
 841                            strcmp(*argv, "brd") == 0) {
 842                         NEXT_ARG();
 843                         newbrd = *argv;
 844                 } else if (matches(*argv, "txqueuelen") == 0 ||
 845                            strcmp(*argv, "qlen") == 0 ||
 846                            matches(*argv, "txqlen") == 0) {
 847                         NEXT_ARG();
 848                         if (qlen != -1)
 849                                 duparg("txqueuelen", *argv);
 850                         if (get_integer(&qlen,  *argv, 0))
 851                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 852                 } else if (strcmp(*argv, "mtu") == 0) {
 853                         NEXT_ARG();
 854                         if (mtu != -1)
 855                                 duparg("mtu", *argv);
 856                         if (get_integer(&mtu, *argv, 0))
 857                                 invarg("Invalid \"mtu\" value\n", *argv);
 858                 } else if (strcmp(*argv, "multicast") == 0) {
 859                         NEXT_ARG();
 860                         mask |= IFF_MULTICAST;
 861                         if (strcmp(*argv, "on") == 0) {
 862                                 flags |= IFF_MULTICAST;
 863                         } else if (strcmp(*argv, "off") == 0) {
 864                                 flags &= ~IFF_MULTICAST;
 865                         } else
 866                                 return on_off("multicast", *argv);
 867                 } else if (strcmp(*argv, "allmulticast") == 0) {
 868                         NEXT_ARG();
 869                         mask |= IFF_ALLMULTI;
 870                         if (strcmp(*argv, "on") == 0) {
 871                                 flags |= IFF_ALLMULTI;
 872                         } else if (strcmp(*argv, "off") == 0) {
 873                                 flags &= ~IFF_ALLMULTI;
 874                         } else
 875                                 return on_off("allmulticast", *argv);
 876                 } else if (strcmp(*argv, "promisc") == 0) {
 877                         NEXT_ARG();
 878                         mask |= IFF_PROMISC;
 879                         if (strcmp(*argv, "on") == 0) {
 880                                 flags |= IFF_PROMISC;
 881                         } else if (strcmp(*argv, "off") == 0) {
 882                                 flags &= ~IFF_PROMISC;
 883                         } else
 884                                 return on_off("promisc", *argv);
 885                 } else if (strcmp(*argv, "trailers") == 0) {
 886                         NEXT_ARG();
 887                         mask |= IFF_NOTRAILERS;
 888                         if (strcmp(*argv, "off") == 0) {
 889                                 flags |= IFF_NOTRAILERS;
 890                         } else if (strcmp(*argv, "on") == 0) {
 891                                 flags &= ~IFF_NOTRAILERS;
 892                         } else
 893                                 return on_off("trailers", *argv);
 894                 } else if (strcmp(*argv, "arp") == 0) {
 895                         NEXT_ARG();
 896                         mask |= IFF_NOARP;
 897                         if (strcmp(*argv, "on") == 0) {
 898                                 flags &= ~IFF_NOARP;
 899                         } else if (strcmp(*argv, "off") == 0) {
 900                                 flags |= IFF_NOARP;
 901                         } else
 902                                 return on_off("noarp", *argv);
 903                 } else if (matches(*argv, "dynamic") == 0) {
 904                         NEXT_ARG();
 905                         mask |= IFF_DYNAMIC;
 906                         if (strcmp(*argv, "on") == 0) {
 907                                 flags |= IFF_DYNAMIC;
 908                         } else if (strcmp(*argv, "off") == 0) {
 909                                 flags &= ~IFF_DYNAMIC;
 910                         } else
 911                                 return on_off("dynamic", *argv);
 912                 } else {
 913                         if (strcmp(*argv, "dev") == 0) {
 914                                 NEXT_ARG();
 915                         }
 916                         if (matches(*argv, "help") == 0)
 917                                 usage();
 918                         if (dev)
 919                                 duparg2("dev", *argv);
 920                         dev = *argv;
 921                 }
 922                 argc--; argv++;
 923         }
 924
 925         if (!dev) {
 926                 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
 927                 exit(-1);
 928         }
 929
 930         if (newaddr || newbrd) {
 931                 halen = get_address(dev, &htype);
 932                 if (halen < 0)
 933                         return -1;
 934                 if (newaddr) {
 935                         if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
 936                                 return -1;
 937                 }
 938                 if (newbrd) {
 939                         if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
 940                                 return -1;
 941                 }
 942         }
 943
 944         if (newname && strcmp(dev, newname)) {
 945                 if (strlen(newname) == 0)
 946                         invarg("\"\" is not a valid device identifier\n", "name");
 947                 if (do_changename(dev, newname) < 0)
 948                         return -1;
 949                 dev = newname;
 950         }
 951         if (qlen != -1) {
 952                 if (set_qlen(dev, qlen) < 0)
 953                         return -1;
 954         }
 955         if (mtu != -1) {
 956                 if (set_mtu(dev, mtu) < 0)
 957                         return -1;
 958         }
 959         if (newaddr || newbrd) {
 960                 if (newbrd) {
 961                         if (set_address(&ifr1, 1) < 0)
 962                                 return -1;
 963                 }
 964                 if (newaddr) {
 965                         if (set_address(&ifr0, 0) < 0)
 966                                 return -1;
 967                 }
 968         }
 969         if (mask)
 970                 return do_chflags(dev, flags, mask);
 971         return 0;
 972 }
 973 #endif /* IPLINK_IOCTL_COMPAT */
 974
 975 int do_iplink(int argc, char **argv)
 976 {
 977         if (argc > 0) {
 978                 if (iplink_have_newlink()) {
 979                         if (matches(*argv, "add") == 0)
 980                                 return iplink_modify(RTM_NEWLINK,
 981                                                      NLM_F_CREATE|NLM_F_EXCL,
 982                                                      argc-1, argv+1);
 983                         if (matches(*argv, "set") == 0 ||
 984                             matches(*argv, "change") == 0)
 985                                 return iplink_modify(RTM_NEWLINK, 0,
 986                                                      argc-1, argv+1);
 987                         if (matches(*argv, "replace") == 0)
 988                                 return iplink_modify(RTM_NEWLINK,
 989                                                      NLM_F_CREATE|NLM_F_REPLACE,
 990                                                      argc-1, argv+1);
 991                         if (matches(*argv, "delete") == 0)
 992                                 return iplink_modify(RTM_DELLINK, 0,
 993                                                      argc-1, argv+1);
 994                 } else {
 995 #if IPLINK_IOCTL_COMPAT
 996                         if (matches(*argv, "set") == 0)
 997                                 return do_set(argc-1, argv+1);
 998 #endif
 999                 }
1000                 if (matches(*argv, "show") == 0 ||
1001                     matches(*argv, "lst") == 0 ||
1002                     matches(*argv, "list") == 0)
1003                         return ipaddr_list_link(argc-1, argv+1);
1004                 if (matches(*argv, "help") == 0)
1005                         usage();
1006         } else
1007                 return ipaddr_list_link(0, NULL);
1008
1009         fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
1010         exit(-1);
1011 }