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
  42 void iplink_usage(void)
  43 {
  44         fprintf(stderr, "Usage: ip link set DEVICE { up | down |\n");
  45         fprintf(stderr, "                            arp { on | off } |\n");
  46         fprintf(stderr, "                            dynamic { on | off } |\n");
  47         fprintf(stderr, "                            multicast { on | off } |\n");
  48         fprintf(stderr, "                            allmulticast { on | off } |\n");
  49         fprintf(stderr, "                            promisc { on | off } |\n");
  50         fprintf(stderr, "                            trailers { on | off } |\n");
  51         fprintf(stderr, "                            txqueuelen PACKETS |\n");
  52         fprintf(stderr, "                            name NEWNAME |\n");
  53         fprintf(stderr, "                            address LLADDR | broadcast LLADDR |\n");
  54         fprintf(stderr, "                            mtu MTU }\n");
  55         fprintf(stderr, "                            netns PID }\n");
  56         fprintf(stderr, "       ip link show [ DEVICE ]\n");
  57         exit(-1);
  58 }
  59
  60 static void usage(void)
  61 {
  62         iplink_usage();
  63 }
  64
  65 static int on_off(char *msg)
  66 {
  67         fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
  68         return -1;
  69 }
  70
  71 static void *BODY;              /* cached dlopen(NULL) handle */
  72 static struct link_util *linkutil_list;
  73
  74 struct link_util *get_link_kind(const char *id)
  75 {
  76         void *dlh;
  77         char buf[256];
  78         struct link_util *l;
  79
  80         for (l = linkutil_list; l; l = l->next)
  81                 if (strcmp(l->id, id) == 0)
  82                         return l;
  83
  84         snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
  85         dlh = dlopen(buf, RTLD_LAZY);
  86         if (dlh == NULL) {
  87                 /* look in current binary, only open once */
  88                 dlh = BODY;
  89                 if (dlh == NULL) {
  90                         dlh = BODY = dlopen(NULL, RTLD_LAZY);
  91                         if (dlh == NULL)
  92                                 return NULL;
  93                 }
  94         }
  95
  96         snprintf(buf, sizeof(buf), "%s_link_util", id);
  97         l = dlsym(dlh, buf);
  98         if (l == NULL)
  99                 return NULL;
 100
 101         l->next = linkutil_list;
 102         linkutil_list = l;
 103         return l;
 104 }
 105
 106 #if IPLINK_IOCTL_COMPAT
 107 static int have_rtnl_newlink = -1;
 108
 109 static int accept_msg(const struct sockaddr_nl *who,
 110                       struct nlmsghdr *n, void *arg)
 111 {
 112         struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
 113
 114         if (n->nlmsg_type == NLMSG_ERROR &&
 115             (err->error == -EOPNOTSUPP || err->error == -EINVAL))
 116                 have_rtnl_newlink = 0;
 117         else
 118                 have_rtnl_newlink = 1;
 119         return -1;
 120 }
 121
 122 static int iplink_have_newlink(void)
 123 {
 124         struct {
 125                 struct nlmsghdr         n;
 126                 struct ifinfomsg        i;
 127                 char                    buf[1024];
 128         } req;
 129
 130         if (have_rtnl_newlink < 0) {
 131                 memset(&req, 0, sizeof(req));
 132
 133                 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 134                 req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
 135                 req.n.nlmsg_type = RTM_NEWLINK;
 136                 req.i.ifi_family = AF_UNSPEC;
 137
 138                 rtnl_send(&rth, (char *)&req.n, req.n.nlmsg_len);
 139                 rtnl_listen(&rth, accept_msg, NULL);
 140         }
 141         return have_rtnl_newlink;
 142 }
 143 #else /* IPLINK_IOCTL_COMPAT */
 144 static int iplink_have_newlink(void)
 145 {
 146         return 1;
 147 }
 148 #endif /* ! IPLINK_IOCTL_COMPAT */
 149
 150 struct iplink_req {
 151         struct nlmsghdr         n;
 152         struct ifinfomsg        i;
 153         char                    buf[1024];
 154 };
 155
 156 int iplink_parse(int argc, char **argv, struct iplink_req *req,
 157                 char **name, char **type, char **link, char **dev)
 158 {
 159         int ret, len;
 160         char abuf[32];
 161         int qlen = -1;
 162         int mtu = -1;
 163         int netns = -1;
 164
 165         ret = argc;
 166
 167         while (argc > 0) {
 168                 if (strcmp(*argv, "up") == 0) {
 169                         req->i.ifi_change |= IFF_UP;
 170                         req->i.ifi_flags |= IFF_UP;
 171                 } else if (strcmp(*argv, "down") == 0) {
 172                         req->i.ifi_change |= IFF_UP;
 173                         req->i.ifi_flags &= ~IFF_UP;
 174                 } else if (strcmp(*argv, "name") == 0) {
 175                         NEXT_ARG();
 176                         *name = *argv;
 177                 } else if (matches(*argv, "link") == 0) {
 178                         NEXT_ARG();
 179                         *link = *argv;
 180                 } else if (matches(*argv, "address") == 0) {
 181                         NEXT_ARG();
 182                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 183                         addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
 184                 } else if (matches(*argv, "broadcast") == 0 ||
 185                                 strcmp(*argv, "brd") == 0) {
 186                         NEXT_ARG();
 187                         len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
 188                         addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
 189                 } else if (matches(*argv, "txqueuelen") == 0 ||
 190                                 strcmp(*argv, "qlen") == 0 ||
 191                                 matches(*argv, "txqlen") == 0) {
 192                         NEXT_ARG();
 193                         if (qlen != -1)
 194                                 duparg("txqueuelen", *argv);
 195                         if (get_integer(&qlen,  *argv, 0))
 196                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 197                         addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
 198                 } else if (strcmp(*argv, "mtu") == 0) {
 199                         NEXT_ARG();
 200                         if (mtu != -1)
 201                                 duparg("mtu", *argv);
 202                         if (get_integer(&mtu, *argv, 0))
 203                                 invarg("Invalid \"mtu\" value\n", *argv);
 204                         addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
 205                 } else if (strcmp(*argv, "netns") == 0) {
 206                         NEXT_ARG();
 207                         if (netns != -1)
 208                                 duparg("netns", *argv);
 209                         if (get_integer(&netns, *argv, 0))
 210                                 invarg("Invalid \"netns\" value\n", *argv);
 211                         addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
 212                 } else if (strcmp(*argv, "multicast") == 0) {
 213                         NEXT_ARG();
 214                         req->i.ifi_change |= IFF_MULTICAST;
 215                         if (strcmp(*argv, "on") == 0) {
 216                                 req->i.ifi_flags |= IFF_MULTICAST;
 217                         } else if (strcmp(*argv, "off") == 0) {
 218                                 req->i.ifi_flags &= ~IFF_MULTICAST;
 219                         } else
 220                                 return on_off("multicast");
 221                 } else if (strcmp(*argv, "allmulticast") == 0) {
 222                         NEXT_ARG();
 223                         req->i.ifi_change |= IFF_ALLMULTI;
 224                         if (strcmp(*argv, "on") == 0) {
 225                                 req->i.ifi_flags |= IFF_ALLMULTI;
 226                         } else if (strcmp(*argv, "off") == 0) {
 227                                 req->i.ifi_flags &= ~IFF_ALLMULTI;
 228                         } else
 229                                 return on_off("allmulticast");
 230                 } else if (strcmp(*argv, "promisc") == 0) {
 231                         NEXT_ARG();
 232                         req->i.ifi_change |= IFF_PROMISC;
 233                         if (strcmp(*argv, "on") == 0) {
 234                                 req->i.ifi_flags |= IFF_PROMISC;
 235                         } else if (strcmp(*argv, "off") == 0) {
 236                                 req->i.ifi_flags &= ~IFF_PROMISC;
 237                         } else
 238                                 return on_off("promisc");
 239                 } else if (strcmp(*argv, "trailers") == 0) {
 240                         NEXT_ARG();
 241                         req->i.ifi_change |= IFF_NOTRAILERS;
 242                         if (strcmp(*argv, "off") == 0) {
 243                                 req->i.ifi_flags |= IFF_NOTRAILERS;
 244                         } else if (strcmp(*argv, "on") == 0) {
 245                                 req->i.ifi_flags &= ~IFF_NOTRAILERS;
 246                         } else
 247                                 return on_off("trailers");
 248                 } else if (strcmp(*argv, "arp") == 0) {
 249                         NEXT_ARG();
 250                         req->i.ifi_change |= IFF_NOARP;
 251                         if (strcmp(*argv, "on") == 0) {
 252                                 req->i.ifi_flags &= ~IFF_NOARP;
 253                         } else if (strcmp(*argv, "off") == 0) {
 254                                 req->i.ifi_flags |= IFF_NOARP;
 255                         } else
 256                                 return on_off("noarp");
 257 #ifdef IFF_DYNAMIC
 258                 } else if (matches(*argv, "dynamic") == 0) {
 259                         NEXT_ARG();
 260                         req->i.ifi_change |= IFF_DYNAMIC;
 261                         if (strcmp(*argv, "on") == 0) {
 262                                 req->i.ifi_flags |= IFF_DYNAMIC;
 263                         } else if (strcmp(*argv, "off") == 0) {
 264                                 req->i.ifi_flags &= ~IFF_DYNAMIC;
 265                         } else
 266                                 return on_off("dynamic");
 267 #endif
 268                 } else if (matches(*argv, "type") == 0) {
 269                         NEXT_ARG();
 270                         *type = *argv;
 271                         argc--; argv++;
 272                         break;
 273                 } else {
 274                         if (strcmp(*argv, "dev") == 0) {
 275                                 NEXT_ARG();
 276                         }
 277                         if (matches(*argv, "help") == 0)
 278                                 usage();
 279                         if (*dev)
 280                                 duparg2("dev", *argv);
 281                         *dev = *argv;
 282                 }
 283                 argc--; argv++;
 284         }
 285
 286         return ret - argc;
 287 }
 288
 289 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 290 {
 291         int len;
 292         char *dev = NULL;
 293         char *name = NULL;
 294         char *link = NULL;
 295         char *type = NULL;
 296         struct link_util *lu = NULL;
 297         struct iplink_req req;
 298         int ret;
 299
 300         memset(&req, 0, sizeof(req));
 301
 302         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 303         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 304         req.n.nlmsg_type = cmd;
 305         req.i.ifi_family = preferred_family;
 306
 307         ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev);
 308         if (ret < 0)
 309                 return ret;
 310
 311         argc -= ret;
 312         argv += ret;
 313         ll_init_map(&rth);
 314
 315         if (type) {
 316                 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
 317                 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
 318                 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
 319                          strlen(type));
 320
 321                 lu = get_link_kind(type);
 322                 if (lu && argc) {
 323                         struct rtattr * data = NLMSG_TAIL(&req.n);
 324                         addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
 325
 326                         if (lu->parse_opt &&
 327                             lu->parse_opt(lu, argc, argv, &req.n))
 328                                 return -1;
 329
 330                         data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
 331                 } else if (argc) {
 332                         if (matches(*argv, "help") == 0)
 333                                 usage();
 334                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
 335                                         "Try \"ip link help\".\n", *argv);
 336                         return -1;
 337                 }
 338                 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
 339         }
 340
 341         if (!(flags & NLM_F_CREATE)) {
 342                 if (!dev) {
 343                         fprintf(stderr, "Not enough information: \"dev\" "
 344                                         "argument is required.\n");
 345                         exit(-1);
 346                 }
 347
 348                 req.i.ifi_index = ll_name_to_index(dev);
 349                 if (req.i.ifi_index == 0) {
 350                         fprintf(stderr, "Cannot find device \"%s\"\n", dev);
 351                         return -1;
 352                 }
 353         } else {
 354                 /* Allow "ip link add dev" and "ip link add name" */
 355                 if (!name)
 356                         name = dev;
 357
 358                 if (link) {
 359                         int ifindex;
 360
 361                         ifindex = ll_name_to_index(link);
 362                         if (ifindex == 0) {
 363                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 364                                         link);
 365                                 return -1;
 366                         }
 367                         addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
 368                 }
 369         }
 370
 371         if (name) {
 372                 len = strlen(name) + 1;
 373                 if (len == 1)
 374                         invarg("\"\" is not a valid device identifier\n", "name");
 375                 if (len > IFNAMSIZ)
 376                         invarg("\"name\" too long\n", name);
 377                 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
 378         }
 379
 380         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 381                 exit(2);
 382
 383         return 0;
 384 }
 385
 386 #if IPLINK_IOCTL_COMPAT
 387 static int get_ctl_fd(void)
 388 {
 389         int s_errno;
 390         int fd;
 391
 392         fd = socket(PF_INET, SOCK_DGRAM, 0);
 393         if (fd >= 0)
 394                 return fd;
 395         s_errno = errno;
 396         fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 397         if (fd >= 0)
 398                 return fd;
 399         fd = socket(PF_INET6, SOCK_DGRAM, 0);
 400         if (fd >= 0)
 401                 return fd;
 402         errno = s_errno;
 403         perror("Cannot create control socket");
 404         return -1;
 405 }
 406
 407 static int do_chflags(const char *dev, __u32 flags, __u32 mask)
 408 {
 409         struct ifreq ifr;
 410         int fd;
 411         int err;
 412
 413         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 414         fd = get_ctl_fd();
 415         if (fd < 0)
 416                 return -1;
 417         err = ioctl(fd, SIOCGIFFLAGS, &ifr);
 418         if (err) {
 419                 perror("SIOCGIFFLAGS");
 420                 close(fd);
 421                 return -1;
 422         }
 423         if ((ifr.ifr_flags^flags)&mask) {
 424                 ifr.ifr_flags &= ~mask;
 425                 ifr.ifr_flags |= mask&flags;
 426                 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
 427                 if (err)
 428                         perror("SIOCSIFFLAGS");
 429         }
 430         close(fd);
 431         return err;
 432 }
 433
 434 static int do_changename(const char *dev, const char *newdev)
 435 {
 436         struct ifreq ifr;
 437         int fd;
 438         int err;
 439
 440         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 441         strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
 442         fd = get_ctl_fd();
 443         if (fd < 0)
 444                 return -1;
 445         err = ioctl(fd, SIOCSIFNAME, &ifr);
 446         if (err) {
 447                 perror("SIOCSIFNAME");
 448                 close(fd);
 449                 return -1;
 450         }
 451         close(fd);
 452         return err;
 453 }
 454
 455 static int set_qlen(const char *dev, int qlen)
 456 {
 457         struct ifreq ifr;
 458         int s;
 459
 460         s = get_ctl_fd();
 461         if (s < 0)
 462                 return -1;
 463
 464         memset(&ifr, 0, sizeof(ifr));
 465         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 466         ifr.ifr_qlen = qlen;
 467         if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
 468                 perror("SIOCSIFXQLEN");
 469                 close(s);
 470                 return -1;
 471         }
 472         close(s);
 473
 474         return 0;
 475 }
 476
 477 static int set_mtu(const char *dev, int mtu)
 478 {
 479         struct ifreq ifr;
 480         int s;
 481
 482         s = get_ctl_fd();
 483         if (s < 0)
 484                 return -1;
 485
 486         memset(&ifr, 0, sizeof(ifr));
 487         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 488         ifr.ifr_mtu = mtu;
 489         if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
 490                 perror("SIOCSIFMTU");
 491                 close(s);
 492                 return -1;
 493         }
 494         close(s);
 495
 496         return 0;
 497 }
 498
 499 static int get_address(const char *dev, int *htype)
 500 {
 501         struct ifreq ifr;
 502         struct sockaddr_ll me;
 503         socklen_t alen;
 504         int s;
 505
 506         s = socket(PF_PACKET, SOCK_DGRAM, 0);
 507         if (s < 0) {
 508                 perror("socket(PF_PACKET)");
 509                 return -1;
 510         }
 511
 512         memset(&ifr, 0, sizeof(ifr));
 513         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 514         if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 515                 perror("SIOCGIFINDEX");
 516                 close(s);
 517                 return -1;
 518         }
 519
 520         memset(&me, 0, sizeof(me));
 521         me.sll_family = AF_PACKET;
 522         me.sll_ifindex = ifr.ifr_ifindex;
 523         me.sll_protocol = htons(ETH_P_LOOP);
 524         if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 525                 perror("bind");
 526                 close(s);
 527                 return -1;
 528         }
 529
 530         alen = sizeof(me);
 531         if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
 532                 perror("getsockname");
 533                 close(s);
 534                 return -1;
 535         }
 536         close(s);
 537         *htype = me.sll_hatype;
 538         return me.sll_halen;
 539 }
 540
 541 static int parse_address(const char *dev, int hatype, int halen,
 542                 char *lla, struct ifreq *ifr)
 543 {
 544         int alen;
 545
 546         memset(ifr, 0, sizeof(*ifr));
 547         strncpy(ifr->ifr_name, dev, IFNAMSIZ);
 548         ifr->ifr_hwaddr.sa_family = hatype;
 549         alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
 550         if (alen < 0)
 551                 return -1;
 552         if (alen != halen) {
 553                 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
 554                 return -1;
 555         }
 556         return 0;
 557 }
 558
 559 static int set_address(struct ifreq *ifr, int brd)
 560 {
 561         int s;
 562
 563         s = get_ctl_fd();
 564         if (s < 0)
 565                 return -1;
 566         if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
 567                 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
 568                 close(s);
 569                 return -1;
 570         }
 571         close(s);
 572         return 0;
 573 }
 574
 575
 576 static int do_set(int argc, char **argv)
 577 {
 578         char *dev = NULL;
 579         __u32 mask = 0;
 580         __u32 flags = 0;
 581         int qlen = -1;
 582         int mtu = -1;
 583         char *newaddr = NULL;
 584         char *newbrd = NULL;
 585         struct ifreq ifr0, ifr1;
 586         char *newname = NULL;
 587         int htype, halen;
 588
 589         while (argc > 0) {
 590                 if (strcmp(*argv, "up") == 0) {
 591                         mask |= IFF_UP;
 592                         flags |= IFF_UP;
 593                 } else if (strcmp(*argv, "down") == 0) {
 594                         mask |= IFF_UP;
 595                         flags &= ~IFF_UP;
 596                 } else if (strcmp(*argv, "name") == 0) {
 597                         NEXT_ARG();
 598                         newname = *argv;
 599                 } else if (matches(*argv, "address") == 0) {
 600                         NEXT_ARG();
 601                         newaddr = *argv;
 602                 } else if (matches(*argv, "broadcast") == 0 ||
 603                            strcmp(*argv, "brd") == 0) {
 604                         NEXT_ARG();
 605                         newbrd = *argv;
 606                 } else if (matches(*argv, "txqueuelen") == 0 ||
 607                            strcmp(*argv, "qlen") == 0 ||
 608                            matches(*argv, "txqlen") == 0) {
 609                         NEXT_ARG();
 610                         if (qlen != -1)
 611                                 duparg("txqueuelen", *argv);
 612                         if (get_integer(&qlen,  *argv, 0))
 613                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 614                 } else if (strcmp(*argv, "mtu") == 0) {
 615                         NEXT_ARG();
 616                         if (mtu != -1)
 617                                 duparg("mtu", *argv);
 618                         if (get_integer(&mtu, *argv, 0))
 619                                 invarg("Invalid \"mtu\" value\n", *argv);
 620                 } else if (strcmp(*argv, "multicast") == 0) {
 621                         NEXT_ARG();
 622                         mask |= IFF_MULTICAST;
 623                         if (strcmp(*argv, "on") == 0) {
 624                                 flags |= IFF_MULTICAST;
 625                         } else if (strcmp(*argv, "off") == 0) {
 626                                 flags &= ~IFF_MULTICAST;
 627                         } else
 628                                 return on_off("multicast");
 629                 } else if (strcmp(*argv, "allmulticast") == 0) {
 630                         NEXT_ARG();
 631                         mask |= IFF_ALLMULTI;
 632                         if (strcmp(*argv, "on") == 0) {
 633                                 flags |= IFF_ALLMULTI;
 634                         } else if (strcmp(*argv, "off") == 0) {
 635                                 flags &= ~IFF_ALLMULTI;
 636                         } else
 637                                 return on_off("allmulticast");
 638                 } else if (strcmp(*argv, "promisc") == 0) {
 639                         NEXT_ARG();
 640                         mask |= IFF_PROMISC;
 641                         if (strcmp(*argv, "on") == 0) {
 642                                 flags |= IFF_PROMISC;
 643                         } else if (strcmp(*argv, "off") == 0) {
 644                                 flags &= ~IFF_PROMISC;
 645                         } else
 646                                 return on_off("promisc");
 647                 } else if (strcmp(*argv, "trailers") == 0) {
 648                         NEXT_ARG();
 649                         mask |= IFF_NOTRAILERS;
 650                         if (strcmp(*argv, "off") == 0) {
 651                                 flags |= IFF_NOTRAILERS;
 652                         } else if (strcmp(*argv, "on") == 0) {
 653                                 flags &= ~IFF_NOTRAILERS;
 654                         } else
 655                                 return on_off("trailers");
 656                 } else if (strcmp(*argv, "arp") == 0) {
 657                         NEXT_ARG();
 658                         mask |= IFF_NOARP;
 659                         if (strcmp(*argv, "on") == 0) {
 660                                 flags &= ~IFF_NOARP;
 661                         } else if (strcmp(*argv, "off") == 0) {
 662                                 flags |= IFF_NOARP;
 663                         } else
 664                                 return on_off("noarp");
 665 #ifdef IFF_DYNAMIC
 666                 } else if (matches(*argv, "dynamic") == 0) {
 667                         NEXT_ARG();
 668                         mask |= IFF_DYNAMIC;
 669                         if (strcmp(*argv, "on") == 0) {
 670                                 flags |= IFF_DYNAMIC;
 671                         } else if (strcmp(*argv, "off") == 0) {
 672                                 flags &= ~IFF_DYNAMIC;
 673                         } else
 674                                 return on_off("dynamic");
 675 #endif
 676                 } else {
 677                         if (strcmp(*argv, "dev") == 0) {
 678                                 NEXT_ARG();
 679                         }
 680                         if (matches(*argv, "help") == 0)
 681                                 usage();
 682                         if (dev)
 683                                 duparg2("dev", *argv);
 684                         dev = *argv;
 685                 }
 686                 argc--; argv++;
 687         }
 688
 689         if (!dev) {
 690                 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
 691                 exit(-1);
 692         }
 693
 694         if (newaddr || newbrd) {
 695                 halen = get_address(dev, &htype);
 696                 if (halen < 0)
 697                         return -1;
 698                 if (newaddr) {
 699                         if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
 700                                 return -1;
 701                 }
 702                 if (newbrd) {
 703                         if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
 704                                 return -1;
 705                 }
 706         }
 707
 708         if (newname && strcmp(dev, newname)) {
 709                 if (strlen(newname) == 0)
 710                         invarg("\"\" is not a valid device identifier\n", "name");
 711                 if (do_changename(dev, newname) < 0)
 712                         return -1;
 713                 dev = newname;
 714         }
 715         if (qlen != -1) {
 716                 if (set_qlen(dev, qlen) < 0)
 717                         return -1;
 718         }
 719         if (mtu != -1) {
 720                 if (set_mtu(dev, mtu) < 0)
 721                         return -1;
 722         }
 723         if (newaddr || newbrd) {
 724                 if (newbrd) {
 725                         if (set_address(&ifr1, 1) < 0)
 726                                 return -1;
 727                 }
 728                 if (newaddr) {
 729                         if (set_address(&ifr0, 0) < 0)
 730                                 return -1;
 731                 }
 732         }
 733         if (mask)
 734                 return do_chflags(dev, flags, mask);
 735         return 0;
 736 }
 737 #endif /* IPLINK_IOCTL_COMPAT */
 738
 739 int do_iplink(int argc, char **argv)
 740 {
 741         if (argc > 0) {
 742                 if (iplink_have_newlink()) {
 743                         if (matches(*argv, "add") == 0)
 744                                 return iplink_modify(RTM_NEWLINK,
 745                                                      NLM_F_CREATE|NLM_F_EXCL,
 746                                                      argc-1, argv+1);
 747                         if (matches(*argv, "set") == 0 ||
 748                             matches(*argv, "change") == 0)
 749                                 return iplink_modify(RTM_NEWLINK, 0,
 750                                                      argc-1, argv+1);
 751                         if (matches(*argv, "replace") == 0)
 752                                 return iplink_modify(RTM_NEWLINK,
 753                                                      NLM_F_CREATE|NLM_F_REPLACE,
 754                                                      argc-1, argv+1);
 755                         if (matches(*argv, "delete") == 0)
 756                                 return iplink_modify(RTM_DELLINK, 0,
 757                                                      argc-1, argv+1);
 758                 } else {
 759 #if IPLINK_IOCTL_COMPAT
 760                         if (matches(*argv, "set") == 0)
 761                                 return do_set(argc-1, argv+1);
 762 #endif
 763                 }
 764                 if (matches(*argv, "show") == 0 ||
 765                     matches(*argv, "lst") == 0 ||
 766                     matches(*argv, "list") == 0)
 767                         return ipaddr_list_link(argc-1, argv+1);
 768                 if (matches(*argv, "help") == 0)
 769                         usage();
 770         } else
 771                 return ipaddr_list_link(0, NULL);
 772
 773         fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
 774         exit(-1);
 775 }