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 (*dev)
 278                                 duparg2("dev", *argv);
 279                         *dev = *argv;
 280                 }
 281                 argc--; argv++;
 282         }
 283
 284         return ret - argc;
 285 }
 286
 287 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
 288 {
 289         int len;
 290         char *dev = NULL;
 291         char *name = NULL;
 292         char *link = NULL;
 293         char *type = NULL;
 294         struct link_util *lu = NULL;
 295         struct iplink_req req;
 296         int ret;
 297
 298         memset(&req, 0, sizeof(req));
 299
 300         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
 301         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 302         req.n.nlmsg_type = cmd;
 303         req.i.ifi_family = preferred_family;
 304
 305         ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev);
 306         if (ret < 0)
 307                 return ret;
 308
 309         argc -= ret;
 310         argv += ret;
 311         ll_init_map(&rth);
 312
 313         if (type) {
 314                 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
 315                 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
 316                 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
 317                          strlen(type));
 318
 319                 lu = get_link_kind(type);
 320                 if (lu && argc) {
 321                         struct rtattr * data = NLMSG_TAIL(&req.n);
 322                         addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
 323
 324                         if (lu->parse_opt &&
 325                             lu->parse_opt(lu, argc, argv, &req.n))
 326                                 return -1;
 327
 328                         data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
 329                 } else if (argc) {
 330                         if (matches(*argv, "help") == 0)
 331                                 usage();
 332                         fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
 333                                         "Try \"ip link help\".\n", *argv);
 334                         return -1;
 335                 }
 336                 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
 337         }
 338
 339         if (!(flags & NLM_F_CREATE)) {
 340                 if (!dev) {
 341                         fprintf(stderr, "Not enough information: \"dev\" "
 342                                         "argument is required.\n");
 343                         exit(-1);
 344                 }
 345
 346                 req.i.ifi_index = ll_name_to_index(dev);
 347                 if (req.i.ifi_index == 0) {
 348                         fprintf(stderr, "Cannot find device \"%s\"\n", dev);
 349                         return -1;
 350                 }
 351         } else {
 352                 /* Allow "ip link add dev" and "ip link add name" */
 353                 if (!name)
 354                         name = dev;
 355
 356                 if (link) {
 357                         int ifindex;
 358
 359                         ifindex = ll_name_to_index(link);
 360                         if (ifindex == 0) {
 361                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 362                                         link);
 363                                 return -1;
 364                         }
 365                         addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
 366                 }
 367         }
 368
 369         if (name) {
 370                 len = strlen(name) + 1;
 371                 if (len == 1)
 372                         invarg("\"\" is not a valid device identifier\n", "name");
 373                 if (len > IFNAMSIZ)
 374                         invarg("\"name\" too long\n", name);
 375                 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
 376         }
 377
 378         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 379                 exit(2);
 380
 381         return 0;
 382 }
 383
 384 #if IPLINK_IOCTL_COMPAT
 385 static int get_ctl_fd(void)
 386 {
 387         int s_errno;
 388         int fd;
 389
 390         fd = socket(PF_INET, SOCK_DGRAM, 0);
 391         if (fd >= 0)
 392                 return fd;
 393         s_errno = errno;
 394         fd = socket(PF_PACKET, SOCK_DGRAM, 0);
 395         if (fd >= 0)
 396                 return fd;
 397         fd = socket(PF_INET6, SOCK_DGRAM, 0);
 398         if (fd >= 0)
 399                 return fd;
 400         errno = s_errno;
 401         perror("Cannot create control socket");
 402         return -1;
 403 }
 404
 405 static int do_chflags(const char *dev, __u32 flags, __u32 mask)
 406 {
 407         struct ifreq ifr;
 408         int fd;
 409         int err;
 410
 411         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 412         fd = get_ctl_fd();
 413         if (fd < 0)
 414                 return -1;
 415         err = ioctl(fd, SIOCGIFFLAGS, &ifr);
 416         if (err) {
 417                 perror("SIOCGIFFLAGS");
 418                 close(fd);
 419                 return -1;
 420         }
 421         if ((ifr.ifr_flags^flags)&mask) {
 422                 ifr.ifr_flags &= ~mask;
 423                 ifr.ifr_flags |= mask&flags;
 424                 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
 425                 if (err)
 426                         perror("SIOCSIFFLAGS");
 427         }
 428         close(fd);
 429         return err;
 430 }
 431
 432 static int do_changename(const char *dev, const char *newdev)
 433 {
 434         struct ifreq ifr;
 435         int fd;
 436         int err;
 437
 438         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 439         strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
 440         fd = get_ctl_fd();
 441         if (fd < 0)
 442                 return -1;
 443         err = ioctl(fd, SIOCSIFNAME, &ifr);
 444         if (err) {
 445                 perror("SIOCSIFNAME");
 446                 close(fd);
 447                 return -1;
 448         }
 449         close(fd);
 450         return err;
 451 }
 452
 453 static int set_qlen(const char *dev, int qlen)
 454 {
 455         struct ifreq ifr;
 456         int s;
 457
 458         s = get_ctl_fd();
 459         if (s < 0)
 460                 return -1;
 461
 462         memset(&ifr, 0, sizeof(ifr));
 463         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 464         ifr.ifr_qlen = qlen;
 465         if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
 466                 perror("SIOCSIFXQLEN");
 467                 close(s);
 468                 return -1;
 469         }
 470         close(s);
 471
 472         return 0;
 473 }
 474
 475 static int set_mtu(const char *dev, int mtu)
 476 {
 477         struct ifreq ifr;
 478         int s;
 479
 480         s = get_ctl_fd();
 481         if (s < 0)
 482                 return -1;
 483
 484         memset(&ifr, 0, sizeof(ifr));
 485         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 486         ifr.ifr_mtu = mtu;
 487         if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
 488                 perror("SIOCSIFMTU");
 489                 close(s);
 490                 return -1;
 491         }
 492         close(s);
 493
 494         return 0;
 495 }
 496
 497 static int get_address(const char *dev, int *htype)
 498 {
 499         struct ifreq ifr;
 500         struct sockaddr_ll me;
 501         socklen_t alen;
 502         int s;
 503
 504         s = socket(PF_PACKET, SOCK_DGRAM, 0);
 505         if (s < 0) {
 506                 perror("socket(PF_PACKET)");
 507                 return -1;
 508         }
 509
 510         memset(&ifr, 0, sizeof(ifr));
 511         strncpy(ifr.ifr_name, dev, IFNAMSIZ);
 512         if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
 513                 perror("SIOCGIFINDEX");
 514                 close(s);
 515                 return -1;
 516         }
 517
 518         memset(&me, 0, sizeof(me));
 519         me.sll_family = AF_PACKET;
 520         me.sll_ifindex = ifr.ifr_ifindex;
 521         me.sll_protocol = htons(ETH_P_LOOP);
 522         if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
 523                 perror("bind");
 524                 close(s);
 525                 return -1;
 526         }
 527
 528         alen = sizeof(me);
 529         if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
 530                 perror("getsockname");
 531                 close(s);
 532                 return -1;
 533         }
 534         close(s);
 535         *htype = me.sll_hatype;
 536         return me.sll_halen;
 537 }
 538
 539 static int parse_address(const char *dev, int hatype, int halen,
 540                 char *lla, struct ifreq *ifr)
 541 {
 542         int alen;
 543
 544         memset(ifr, 0, sizeof(*ifr));
 545         strncpy(ifr->ifr_name, dev, IFNAMSIZ);
 546         ifr->ifr_hwaddr.sa_family = hatype;
 547         alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
 548         if (alen < 0)
 549                 return -1;
 550         if (alen != halen) {
 551                 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
 552                 return -1;
 553         }
 554         return 0;
 555 }
 556
 557 static int set_address(struct ifreq *ifr, int brd)
 558 {
 559         int s;
 560
 561         s = get_ctl_fd();
 562         if (s < 0)
 563                 return -1;
 564         if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
 565                 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
 566                 close(s);
 567                 return -1;
 568         }
 569         close(s);
 570         return 0;
 571 }
 572
 573
 574 static int do_set(int argc, char **argv)
 575 {
 576         char *dev = NULL;
 577         __u32 mask = 0;
 578         __u32 flags = 0;
 579         int qlen = -1;
 580         int mtu = -1;
 581         char *newaddr = NULL;
 582         char *newbrd = NULL;
 583         struct ifreq ifr0, ifr1;
 584         char *newname = NULL;
 585         int htype, halen;
 586
 587         while (argc > 0) {
 588                 if (strcmp(*argv, "up") == 0) {
 589                         mask |= IFF_UP;
 590                         flags |= IFF_UP;
 591                 } else if (strcmp(*argv, "down") == 0) {
 592                         mask |= IFF_UP;
 593                         flags &= ~IFF_UP;
 594                 } else if (strcmp(*argv, "name") == 0) {
 595                         NEXT_ARG();
 596                         newname = *argv;
 597                 } else if (matches(*argv, "address") == 0) {
 598                         NEXT_ARG();
 599                         newaddr = *argv;
 600                 } else if (matches(*argv, "broadcast") == 0 ||
 601                            strcmp(*argv, "brd") == 0) {
 602                         NEXT_ARG();
 603                         newbrd = *argv;
 604                 } else if (matches(*argv, "txqueuelen") == 0 ||
 605                            strcmp(*argv, "qlen") == 0 ||
 606                            matches(*argv, "txqlen") == 0) {
 607                         NEXT_ARG();
 608                         if (qlen != -1)
 609                                 duparg("txqueuelen", *argv);
 610                         if (get_integer(&qlen,  *argv, 0))
 611                                 invarg("Invalid \"txqueuelen\" value\n", *argv);
 612                 } else if (strcmp(*argv, "mtu") == 0) {
 613                         NEXT_ARG();
 614                         if (mtu != -1)
 615                                 duparg("mtu", *argv);
 616                         if (get_integer(&mtu, *argv, 0))
 617                                 invarg("Invalid \"mtu\" value\n", *argv);
 618                 } else if (strcmp(*argv, "multicast") == 0) {
 619                         NEXT_ARG();
 620                         mask |= IFF_MULTICAST;
 621                         if (strcmp(*argv, "on") == 0) {
 622                                 flags |= IFF_MULTICAST;
 623                         } else if (strcmp(*argv, "off") == 0) {
 624                                 flags &= ~IFF_MULTICAST;
 625                         } else
 626                                 return on_off("multicast");
 627                 } else if (strcmp(*argv, "allmulticast") == 0) {
 628                         NEXT_ARG();
 629                         mask |= IFF_ALLMULTI;
 630                         if (strcmp(*argv, "on") == 0) {
 631                                 flags |= IFF_ALLMULTI;
 632                         } else if (strcmp(*argv, "off") == 0) {
 633                                 flags &= ~IFF_ALLMULTI;
 634                         } else
 635                                 return on_off("allmulticast");
 636                 } else if (strcmp(*argv, "promisc") == 0) {
 637                         NEXT_ARG();
 638                         mask |= IFF_PROMISC;
 639                         if (strcmp(*argv, "on") == 0) {
 640                                 flags |= IFF_PROMISC;
 641                         } else if (strcmp(*argv, "off") == 0) {
 642                                 flags &= ~IFF_PROMISC;
 643                         } else
 644                                 return on_off("promisc");
 645                 } else if (strcmp(*argv, "trailers") == 0) {
 646                         NEXT_ARG();
 647                         mask |= IFF_NOTRAILERS;
 648                         if (strcmp(*argv, "off") == 0) {
 649                                 flags |= IFF_NOTRAILERS;
 650                         } else if (strcmp(*argv, "on") == 0) {
 651                                 flags &= ~IFF_NOTRAILERS;
 652                         } else
 653                                 return on_off("trailers");
 654                 } else if (strcmp(*argv, "arp") == 0) {
 655                         NEXT_ARG();
 656                         mask |= IFF_NOARP;
 657                         if (strcmp(*argv, "on") == 0) {
 658                                 flags &= ~IFF_NOARP;
 659                         } else if (strcmp(*argv, "off") == 0) {
 660                                 flags |= IFF_NOARP;
 661                         } else
 662                                 return on_off("noarp");
 663 #ifdef IFF_DYNAMIC
 664                 } else if (matches(*argv, "dynamic") == 0) {
 665                         NEXT_ARG();
 666                         mask |= IFF_DYNAMIC;
 667                         if (strcmp(*argv, "on") == 0) {
 668                                 flags |= IFF_DYNAMIC;
 669                         } else if (strcmp(*argv, "off") == 0) {
 670                                 flags &= ~IFF_DYNAMIC;
 671                         } else
 672                                 return on_off("dynamic");
 673 #endif
 674                 } else {
 675                         if (strcmp(*argv, "dev") == 0) {
 676                                 NEXT_ARG();
 677                         }
 678                         if (matches(*argv, "help") == 0)
 679                                 usage();
 680                         if (dev)
 681                                 duparg2("dev", *argv);
 682                         dev = *argv;
 683                 }
 684                 argc--; argv++;
 685         }
 686
 687         if (!dev) {
 688                 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
 689                 exit(-1);
 690         }
 691
 692         if (newaddr || newbrd) {
 693                 halen = get_address(dev, &htype);
 694                 if (halen < 0)
 695                         return -1;
 696                 if (newaddr) {
 697                         if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
 698                                 return -1;
 699                 }
 700                 if (newbrd) {
 701                         if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
 702                                 return -1;
 703                 }
 704         }
 705
 706         if (newname && strcmp(dev, newname)) {
 707                 if (strlen(newname) == 0)
 708                         invarg("\"\" is not a valid device identifier\n", "name");
 709                 if (do_changename(dev, newname) < 0)
 710                         return -1;
 711                 dev = newname;
 712         }
 713         if (qlen != -1) {
 714                 if (set_qlen(dev, qlen) < 0)
 715                         return -1;
 716         }
 717         if (mtu != -1) {
 718                 if (set_mtu(dev, mtu) < 0)
 719                         return -1;
 720         }
 721         if (newaddr || newbrd) {
 722                 if (newbrd) {
 723                         if (set_address(&ifr1, 1) < 0)
 724                                 return -1;
 725                 }
 726                 if (newaddr) {
 727                         if (set_address(&ifr0, 0) < 0)
 728                                 return -1;
 729                 }
 730         }
 731         if (mask)
 732                 return do_chflags(dev, flags, mask);
 733         return 0;
 734 }
 735 #endif /* IPLINK_IOCTL_COMPAT */
 736
 737 int do_iplink(int argc, char **argv)
 738 {
 739         if (argc > 0) {
 740                 if (iplink_have_newlink()) {
 741                         if (matches(*argv, "add") == 0)
 742                                 return iplink_modify(RTM_NEWLINK,
 743                                                      NLM_F_CREATE|NLM_F_EXCL,
 744                                                      argc-1, argv+1);
 745                         if (matches(*argv, "set") == 0 ||
 746                             matches(*argv, "change") == 0)
 747                                 return iplink_modify(RTM_NEWLINK, 0,
 748                                                      argc-1, argv+1);
 749                         if (matches(*argv, "replace") == 0)
 750                                 return iplink_modify(RTM_NEWLINK,
 751                                                      NLM_F_CREATE|NLM_F_REPLACE,
 752                                                      argc-1, argv+1);
 753                         if (matches(*argv, "delete") == 0)
 754                                 return iplink_modify(RTM_DELLINK, 0,
 755                                                      argc-1, argv+1);
 756                 } else {
 757 #if IPLINK_IOCTL_COMPAT
 758                         if (matches(*argv, "set") == 0)
 759                                 return do_set(argc-1, argv+1);
 760 #endif
 761                 }
 762                 if (matches(*argv, "show") == 0 ||
 763                     matches(*argv, "lst") == 0 ||
 764                     matches(*argv, "list") == 0)
 765                         return ipaddr_list_link(argc-1, argv+1);
 766                 if (matches(*argv, "help") == 0)
 767                         usage();
 768         } else
 769                 return ipaddr_list_link(0, NULL);
 770
 771         fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
 772         exit(-1);
 773 }