sbin/ifconfig/ifconfig.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sbin/ifconfig/ifconfig.c,v 1.113.2.4 2006/02/09 10:48:43 yar Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/socket.h>
  35 #include <sys/sysctl.h>
  36 #include <sys/time.h>
  37 #include <sys/module.h>
  38 #include <sys/linker.h>
  39 #include <sys/cdefs.h>
  40
  41 #include <net/ethernet.h>
  42 #include <net/if.h>
  43 #include <net/if_var.h>
  44 #include <net/if_dl.h>
  45 #include <net/if_types.h>
  46 #include <net/route.h>
  47
  48 /* IP */
  49 #include <netinet/in.h>
  50 #include <netinet/in_var.h>
  51 #include <arpa/inet.h>
  52 #include <netdb.h>
  53
  54 #include <ctype.h>
  55 #include <err.h>
  56 #include <errno.h>
  57 #include <fcntl.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62
  63 #include "ifconfig.h"
  64
  65 /*
  66  * Since "struct ifreq" is composed of various union members, callers
  67  * should pay special attention to interprete the value.
  68  * (.e.g. little/big endian difference in the structure.)
  69  */
  70 struct  ifreq ifr;
  71
  72 char    name[IFNAMSIZ];
  73 int     flags;
  74 int     setaddr;
  75 int     setmask;
  76 int     doalias;
  77 int     clearaddr;
  78 int     newaddr = 1;
  79 int     verbose;
  80
  81 int     supmedia = 0;
  82 int     printkeys = 0;          /* Print keying material for interfaces. */
  83 int     printname = 0;          /* Print the name of the created interface. */
  84
  85 static  int ifconfig(int argc, char *const *argv, int, const struct afswtch *afp);
  86 static  void status(const struct afswtch *afp, int addrcount,
  87                     struct sockaddr_dl *sdl, struct if_msghdr *ifm,
  88                     struct ifa_msghdr *ifam);
  89 static  void tunnel_status(int s);
  90 static  void usage(void) __dead2;
  91
  92 static struct afswtch *af_getbyname(const char *name);
  93 static struct afswtch *af_getbyfamily(int af);
  94 static void af_other_status(int);
  95
  96 static struct option *opts = NULL;
  97
  98 void
  99 opt_register(struct option *p)
 100 {
 101         p->next = opts;
 102         opts = p;
 103 }
 104
 105 static void
 106 usage(void)
 107 {
 108         char options[1024];
 109         struct option *p;
 110
 111         /* XXX not right but close enough for now */
 112         options[0] = '\0';
 113         for (p = opts; p != NULL; p = p->next) {
 114                 strlcat(options, p->opt_usage, sizeof(options));
 115                 strlcat(options, " ", sizeof(options));
 116         }
 117
 118         fprintf(stderr,
 119         "usage: ifconfig %sinterface address_family [address [dest_address]]\n"
 120         "                [parameters]\n"
 121         "       ifconfig interface create\n"
 122         "       ifconfig -a %s[-d] [-m] [-u] [-v] [address_family]\n"
 123         "       ifconfig -l [-d] [-u] [address_family]\n"
 124         "       ifconfig %s[-d] [-m] [-u] [-v]\n",
 125                 options, options, options);
 126         exit(1);
 127 }
 128
 129 int
 130 main(int argc, char *argv[])
 131 {
 132         int c, all, namesonly, downonly, uponly;
 133         int need_nl = 0, count = 0;
 134         const struct afswtch *afp = NULL;
 135         int addrcount, ifindex;
 136         struct if_msghdr *ifm, *nextifm;
 137         struct ifa_msghdr *ifam;
 138         struct sockaddr_dl *sdl;
 139         char *buf, *lim, *next;
 140         size_t needed;
 141         int mib[6];
 142         char options[1024];
 143         const char *ifname;
 144         struct option *p;
 145         size_t iflen;
 146
 147         all = downonly = uponly = namesonly = verbose = 0;
 148
 149         /* Parse leading line options */
 150         strlcpy(options, "adklmuv", sizeof(options));
 151         for (p = opts; p != NULL; p = p->next)
 152                 strlcat(options, p->opt, sizeof(options));
 153         while ((c = getopt(argc, argv, options)) != -1) {
 154                 switch (c) {
 155                 case 'a':       /* scan all interfaces */
 156                         all++;
 157                         break;
 158                 case 'd':       /* restrict scan to "down" interfaces */
 159                         downonly++;
 160                         break;
 161                 case 'k':
 162                         printkeys++;
 163                         break;
 164                 case 'l':       /* scan interface names only */
 165                         namesonly++;
 166                         break;
 167                 case 'm':       /* show media choices in status */
 168                         supmedia = 1;
 169                         break;
 170                 case 'u':       /* restrict scan to "up" interfaces */
 171                         uponly++;
 172                         break;
 173                 case 'v':
 174                         verbose++;
 175                         break;
 176                 default:
 177                         for (p = opts; p != NULL; p = p->next)
 178                                 if (p->opt[0] == c) {
 179                                         p->cb(optarg);
 180                                         break;
 181                                 }
 182                         if (p == NULL)
 183                                 usage();
 184                         break;
 185                 }
 186         }
 187         argc -= optind;
 188         argv += optind;
 189
 190         /* -l cannot be used with -a or -m */
 191         if (namesonly && (all || supmedia))
 192                 usage();
 193
 194         /* nonsense.. */
 195         if (uponly && downonly)
 196                 usage();
 197
 198         /* no arguments is equivalent to '-a' */
 199         if (!namesonly && argc < 1)
 200                 all = 1;
 201
 202         /* -a and -l allow an address family arg to limit the output */
 203         if (all || namesonly) {
 204                 if (argc > 1)
 205                         usage();
 206
 207                 ifname = NULL;
 208                 ifindex = 0;
 209                 if (argc == 1) {
 210                         afp = af_getbyname(*argv);
 211                         if (afp == NULL)
 212                                 usage();
 213                         if (afp->af_name != NULL)
 214                                 argc--, argv++;
 215                         /* leave with afp non-zero */
 216                 }
 217         } else {
 218                 /* not listing, need an argument */
 219                 if (argc < 1)
 220                         usage();
 221
 222                 ifname = *argv;
 223                 argc--, argv++;
 224
 225                 /* check and maybe load support for this interface */
 226                 ifmaybeload(ifname);
 227                 ifindex = if_nametoindex(ifname);
 228                 if (ifindex == 0) {
 229                         /*
 230                          * NOTE:  We must special-case the `create' command
 231                          * right here as we would otherwise fail when trying
 232                          * to find the interface.
 233                          */
 234                         if (argc > 0 && (strcmp(argv[0], "create") == 0 ||
 235                             strcmp(argv[0], "plumb") == 0)) {
 236                                 iflen = strlcpy(name, ifname, sizeof(name));
 237                                 if (iflen >= sizeof(name))
 238                                         errx(1, "%s: cloning name too long",
 239                                             ifname);
 240                                 ifconfig(argc, argv, 1, NULL);
 241                                 exit(0);
 242                         }
 243                         errx(1, "interface %s does not exist", ifname);
 244                 }
 245         }
 246
 247         /* Check for address family */
 248         if (argc > 0) {
 249                 afp = af_getbyname(*argv);
 250                 if (afp != NULL)
 251                         argc--, argv++;
 252         }
 253
 254 retry:
 255         mib[0] = CTL_NET;
 256         mib[1] = PF_ROUTE;
 257         mib[2] = 0;
 258         mib[3] = 0;                     /* address family */
 259         mib[4] = NET_RT_IFLIST;
 260         mib[5] = ifindex;               /* interface index */
 261
 262         /* if particular family specified, only ask about it */
 263         if (afp != NULL)
 264                 mib[3] = afp->af_af;
 265
 266         if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
 267                 errx(1, "iflist-sysctl-estimate");
 268         if ((buf = malloc(needed)) == NULL)
 269                 errx(1, "malloc");
 270         if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
 271                 if (errno == ENOMEM && count++ < 10) {
 272                         warnx("Routing table grew, retrying");
 273                         free(buf);
 274                         sleep(1);
 275                         goto retry;
 276                 }
 277                 errx(1, "actual retrieval of interface table");
 278         }
 279         lim = buf + needed;
 280
 281         next = buf;
 282         while (next < lim) {
 283                 int name_len;
 284
 285                 ifm = (struct if_msghdr *)next;
 286
 287                 if (ifm->ifm_type == RTM_IFINFO) {
 288 #ifdef notyet
 289                         if (ifm->ifm_data.ifi_datalen == 0)
 290                                 ifm->ifm_data.ifi_datalen = sizeof(struct if_data);
 291                         sdl = (struct sockaddr_dl *)((char *)ifm + sizeof(struct if_msghdr) -
 292                             sizeof(struct if_data) + ifm->ifm_data.ifi_datalen);
 293 #else
 294                         sdl = (struct sockaddr_dl *)(ifm + 1);
 295 #endif
 296                         flags = ifm->ifm_flags;
 297                 } else {
 298                         fprintf(stderr, "out of sync parsing NET_RT_IFLIST\n");
 299                         fprintf(stderr, "expected %d, got %d\n", RTM_IFINFO,
 300                                 ifm->ifm_type);
 301                         fprintf(stderr, "msglen = %d\n", ifm->ifm_msglen);
 302                         fprintf(stderr, "buf:%p, next:%p, lim:%p\n", buf, next,
 303                                 lim);
 304                         exit (1);
 305                 }
 306
 307                 next += ifm->ifm_msglen;
 308                 ifam = NULL;
 309                 addrcount = 0;
 310                 while (next < lim) {
 311
 312                         nextifm = (struct if_msghdr *)next;
 313
 314                         if (nextifm->ifm_type != RTM_NEWADDR)
 315                                 break;
 316
 317                         if (ifam == NULL)
 318                                 ifam = (struct ifa_msghdr *)nextifm;
 319
 320                         addrcount++;
 321                         next += nextifm->ifm_msglen;
 322                 }
 323
 324                 if (sizeof(name) <= sdl->sdl_nlen)
 325                         name_len = sizeof(name) - 1;
 326                 else
 327                         name_len = sdl->sdl_nlen;
 328
 329                 memcpy(name, sdl->sdl_data, name_len);
 330                 name[name_len] = '\0';
 331
 332                 if (all || namesonly) {
 333                         if (uponly)
 334                                 if ((flags & IFF_UP) == 0)
 335                                         continue; /* not up */
 336                         if (downonly)
 337                                 if (flags & IFF_UP)
 338                                         continue; /* not down */
 339                         if (namesonly) {
 340                                 if (afp == NULL || afp->af_af != AF_LINK ||
 341                                     sdl->sdl_type == IFT_ETHER) {
 342                                         if (need_nl)
 343                                                 putchar(' ');
 344                                         fputs(name, stdout);
 345                                         need_nl++;
 346                                 }
 347                                 continue;
 348                         }
 349                 }
 350
 351                 if (argc > 0)
 352                         ifconfig(argc, argv, 0, afp);
 353                 else
 354                         status(afp, addrcount, sdl, ifm, ifam);
 355         }
 356         free(buf);
 357
 358         if (namesonly && need_nl > 0)
 359                 putchar('\n');
 360         if (printname)
 361                 printf("%s\n", name);
 362
 363         exit (0);
 364 }
 365
 366 static struct afswtch *afs = NULL;
 367
 368 void
 369 af_register(struct afswtch *p)
 370 {
 371         p->af_next = afs;
 372         afs = p;
 373 }
 374
 375 static struct afswtch *
 376 af_getbyname(const char *name)
 377 {
 378         struct afswtch *afp;
 379
 380         for (afp = afs; afp !=  NULL; afp = afp->af_next)
 381                 if (strcmp(afp->af_name, name) == 0)
 382                         return afp;
 383         return NULL;
 384 }
 385
 386 static struct afswtch *
 387 af_getbyfamily(int af)
 388 {
 389         struct afswtch *afp;
 390
 391         for (afp = afs; afp != NULL; afp = afp->af_next)
 392                 if (afp->af_af == af)
 393                         return afp;
 394         return NULL;
 395 }
 396
 397 static void
 398 af_other_status(int s)
 399 {
 400         struct afswtch *afp;
 401         uint8_t afmask[howmany(AF_MAX, NBBY)];
 402
 403         memset(afmask, 0, sizeof(afmask));
 404         for (afp = afs; afp != NULL; afp = afp->af_next) {
 405                 if (afp->af_other_status == NULL)
 406                         continue;
 407                 if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
 408                         continue;
 409                 afp->af_other_status(s);
 410                 setbit(afmask, afp->af_af);
 411         }
 412 }
 413
 414 static void
 415 af_all_tunnel_status(int s)
 416 {
 417         struct afswtch *afp;
 418         uint8_t afmask[howmany(AF_MAX, NBBY)];
 419
 420         memset(afmask, 0, sizeof(afmask));
 421         for (afp = afs; afp != NULL; afp = afp->af_next) {
 422                 if (afp->af_status_tunnel == NULL)
 423                         continue;
 424                 if (afp->af_af != AF_UNSPEC && isset(afmask, afp->af_af))
 425                         continue;
 426                 afp->af_status_tunnel(s);
 427                 setbit(afmask, afp->af_af);
 428         }
 429 }
 430
 431 static struct cmd *cmds = NULL;
 432
 433 void
 434 cmd_register(struct cmd *p)
 435 {
 436         p->c_next = cmds;
 437         cmds = p;
 438 }
 439
 440 static const struct cmd *
 441 cmd_lookup(const char *name, int iscreate)
 442 {
 443 #define N(a)    (sizeof(a)/sizeof(a[0]))
 444         const struct cmd *p;
 445
 446         for (p = cmds; p != NULL; p = p->c_next)
 447                 if (strcmp(name, p->c_name) == 0) {
 448                         if (iscreate) {
 449                                 if (p->c_iscloneop)
 450                                         return p;
 451                         } else {
 452                                 if (!p->c_iscloneop)
 453                                         return p;
 454                         }
 455                 }
 456         return NULL;
 457 #undef N
 458 }
 459
 460 struct callback {
 461         callback_func *cb_func;
 462         void    *cb_arg;
 463         struct callback *cb_next;
 464 };
 465 static struct callback *callbacks = NULL;
 466
 467 void
 468 callback_register(callback_func *func, void *arg)
 469 {
 470         struct callback *cb;
 471
 472         cb = malloc(sizeof(struct callback));
 473         if (cb == NULL)
 474                 errx(1, "unable to allocate memory for callback");
 475         cb->cb_func = func;
 476         cb->cb_arg = arg;
 477         cb->cb_next = callbacks;
 478         callbacks = cb;
 479 }
 480
 481 /* specially-handled commands */
 482 static void setifaddr(const char *, int, int, const struct afswtch *);
 483 static const struct cmd setifaddr_cmd = DEF_CMD("ifaddr", 0, setifaddr);
 484
 485 static void setifdstaddr(const char *, int, int, const struct afswtch *);
 486 static const struct cmd setifdstaddr_cmd =
 487         DEF_CMD("ifdstaddr", 0, setifdstaddr);
 488
 489 static int
 490 ifconfig(int argc, char *const *argv, int iscreate, const struct afswtch *uafp)
 491 {
 492         const struct afswtch *afp, *nafp;
 493         struct callback *cb;
 494         int s;
 495
 496         strncpy(ifr.ifr_name, name, sizeof ifr.ifr_name);
 497         afp = uafp != NULL ? uafp : af_getbyname("inet");
 498 top:
 499         ifr.ifr_addr.sa_family =
 500                 afp->af_af == AF_LINK || afp->af_af == AF_UNSPEC ?
 501                 AF_INET : afp->af_af;
 502
 503         if ((s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0)) < 0)
 504                 err(1, "socket(family %u,SOCK_DGRAM", ifr.ifr_addr.sa_family);
 505
 506         while (argc > 0) {
 507                 const struct cmd *p;
 508
 509                 p = cmd_lookup(*argv, iscreate);
 510
 511                 if (iscreate && p == NULL) {
 512                         /*
 513                          * Push the clone create callback so the new
 514                          * device is created and can be used for any
 515                          * remaining arguments.
 516                          */
 517                         cb = callbacks;
 518                         if (cb == NULL)
 519                                 errx(1, "internal error, no callback");
 520                         callbacks = cb->cb_next;
 521                         cb->cb_func(s, cb->cb_arg);
 522                         iscreate = 0;
 523
 524                         /*
 525                          * After cloning, make sure we have an up-to-date name
 526                          * in ifr_name.
 527                          */
 528                         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 529
 530                         /*
 531                          * Handle any address family spec that
 532                          * immediately follows and potentially
 533                          * recreate the socket.
 534                          */
 535                         nafp = af_getbyname(*argv);
 536                         if (nafp != NULL) {
 537                                 argc--, argv++;
 538                                 if (nafp != afp) {
 539                                         close(s);
 540                                         afp = nafp;
 541                                         goto top;
 542                                 }
 543                         }
 544                         /*
 545                          * Look for a normal parameter.
 546                          */
 547                         continue;
 548                 }
 549                 if (p == NULL) {
 550                         /*
 551                          * Not a recognized command, choose between setting
 552                          * the interface address and the dst address.
 553                          */
 554                         p = (setaddr ? &setifdstaddr_cmd : &setifaddr_cmd);
 555                 }
 556                 if (p->c_u.c_func || p->c_u.c_func2) {
 557                         if (p->c_parameter == NEXTARG) {
 558                                 if (argv[1] == NULL)
 559                                         errx(1, "'%s' requires argument",
 560                                             p->c_name);
 561                                 p->c_u.c_func(argv[1], 0, s, afp);
 562                                 argc--, argv++;
 563                         } else if (p->c_parameter == OPTARG) {
 564                                 p->c_u.c_func(argv[1], 0, s, afp);
 565                                 if (argv[1] != NULL)
 566                                         argc--, argv++;
 567                         } else if (p->c_parameter == NEXTARG2) {
 568                                 if (argc < 3)
 569                                         errx(1, "'%s' requires 2 arguments",
 570                                             p->c_name);
 571                                 p->c_u.c_func2(argv[1], argv[2], s, afp);
 572                                 argc -= 2, argv += 2;
 573                         } else
 574                                 p->c_u.c_func(*argv, p->c_parameter, s, afp);
 575                 }
 576                 argc--, argv++;
 577         }
 578
 579         /*
 580          * Do any post argument processing required by the address family.
 581          */
 582         if (afp->af_postproc != NULL)
 583                 afp->af_postproc(s, afp);
 584         /*
 585          * Do deferred callbacks registered while processing
 586          * command-line arguments.
 587          */
 588         for (cb = callbacks; cb != NULL; cb = cb->cb_next)
 589                 cb->cb_func(s, cb->cb_arg);
 590         /*
 591          * Do deferred operations.
 592          */
 593         if (clearaddr) {
 594                 if (afp->af_ridreq == NULL || afp->af_difaddr == 0) {
 595                         warnx("interface %s cannot change %s addresses!",
 596                               name, afp->af_name);
 597                         clearaddr = 0;
 598                 }
 599         }
 600         if (clearaddr) {
 601                 int ret;
 602                 strncpy(afp->af_ridreq, name, sizeof ifr.ifr_name);
 603                 ret = ioctl(s, afp->af_difaddr, afp->af_ridreq);
 604                 if (ret < 0) {
 605                         if (errno == EADDRNOTAVAIL && (doalias >= 0)) {
 606                                 /* means no previous address for interface */
 607                         } else
 608                                 Perror("ioctl (SIOCDIFADDR)");
 609                 }
 610         }
 611         if (newaddr) {
 612                 if (afp->af_addreq == NULL || afp->af_aifaddr == 0) {
 613                         warnx("interface %s cannot change %s addresses!",
 614                               name, afp->af_name);
 615                         newaddr = 0;
 616                 }
 617         }
 618         if (newaddr && (setaddr || setmask)) {
 619                 strncpy(afp->af_addreq, name, sizeof ifr.ifr_name);
 620                 if (ioctl(s, afp->af_aifaddr, afp->af_addreq) < 0)
 621                         Perror("ioctl (SIOCAIFADDR)");
 622         }
 623
 624         close(s);
 625         return(0);
 626 }
 627
 628 /*ARGSUSED*/
 629 static void
 630 setifaddr(const char *addr, int param, int s, const struct afswtch *afp)
 631 {
 632         if (afp->af_getaddr == NULL)
 633                 return;
 634         /*
 635          * Delay the ioctl to set the interface addr until flags are all set.
 636          * The address interpretation may depend on the flags,
 637          * and the flags may change when the address is set.
 638          */
 639         setaddr++;
 640         if (doalias == 0 && afp->af_af != AF_LINK)
 641                 clearaddr = 1;
 642         afp->af_getaddr(addr, (doalias >= 0 ? ADDR : RIDADDR));
 643 }
 644
 645 static void
 646 settunnel(const char *src, const char *dst, int s, const struct afswtch *afp)
 647 {
 648         struct addrinfo *srcres, *dstres;
 649         int ecode;
 650
 651         if (afp->af_settunnel == NULL) {
 652                 warn("address family %s does not support tunnel setup",
 653                         afp->af_name);
 654                 return;
 655         }
 656
 657         if ((ecode = getaddrinfo(src, NULL, NULL, &srcres)) != 0)
 658                 errx(1, "error in parsing address string: %s",
 659                     gai_strerror(ecode));
 660
 661         if ((ecode = getaddrinfo(dst, NULL, NULL, &dstres)) != 0)
 662                 errx(1, "error in parsing address string: %s",
 663                     gai_strerror(ecode));
 664
 665         if (srcres->ai_addr->sa_family != dstres->ai_addr->sa_family)
 666                 errx(1,
 667                     "source and destination address families do not match");
 668
 669         afp->af_settunnel(s, srcres, dstres);
 670
 671         freeaddrinfo(srcres);
 672         freeaddrinfo(dstres);
 673 }
 674
 675 /* ARGSUSED */
 676 static void
 677 deletetunnel(const char *vname, int param, int s, const struct afswtch *afp)
 678 {
 679
 680         if (ioctl(s, SIOCDIFPHYADDR, &ifr) < 0)
 681                 err(1, "SIOCDIFPHYADDR");
 682 }
 683
 684 static void
 685 setifnetmask(const char *addr, int dummy __unused, int s,
 686     const struct afswtch *afp)
 687 {
 688         if (afp->af_getaddr != NULL) {
 689                 setmask++;
 690                 afp->af_getaddr(addr, MASK);
 691         }
 692 }
 693
 694 static void
 695 setifbroadaddr(const char *addr, int dummy __unused, int s,
 696     const struct afswtch *afp)
 697 {
 698         if (afp->af_getaddr != NULL)
 699                 afp->af_getaddr(addr, DSTADDR);
 700 }
 701
 702 static void
 703 notealias(const char *addr, int param, int s, const struct afswtch *afp)
 704 {
 705 #define rqtosa(x) (&(((struct ifreq *)(afp->x))->ifr_addr))
 706         if (setaddr && doalias == 0 && param < 0)
 707                 if (afp->af_addreq != NULL && afp->af_ridreq != NULL)
 708                         bcopy((caddr_t)rqtosa(af_addreq),
 709                               (caddr_t)rqtosa(af_ridreq),
 710                               rqtosa(af_addreq)->sa_len);
 711         doalias = param;
 712         if (param < 0) {
 713                 clearaddr = 1;
 714                 newaddr = 0;
 715         } else
 716                 clearaddr = 0;
 717 #undef rqtosa
 718 }
 719
 720 /*ARGSUSED*/
 721 static void
 722 setifdstaddr(const char *addr, int param __unused, int s,
 723     const struct afswtch *afp)
 724 {
 725         if (afp->af_getaddr != NULL)
 726                 afp->af_getaddr(addr, DSTADDR);
 727 }
 728
 729 /*
 730  * Note: doing an SIOCIGIFFLAGS scribbles on the union portion
 731  * of the ifreq structure, which may confuse other parts of ifconfig.
 732  * Make a private copy so we can avoid that.
 733  */
 734 static void
 735 setifflags(const char *vname, int value, int s, const struct afswtch *afp)
 736 {
 737         struct ifreq            my_ifr;
 738
 739         bcopy((char *)&ifr, (char *)&my_ifr, sizeof(struct ifreq));
 740
 741         if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&my_ifr) < 0) {
 742                 Perror("ioctl (SIOCGIFFLAGS)");
 743                 exit(1);
 744         }
 745         strncpy(my_ifr.ifr_name, name, sizeof (my_ifr.ifr_name));
 746         flags = (my_ifr.ifr_flags & 0xffff) | (my_ifr.ifr_flagshigh << 16);
 747
 748         if (value < 0) {
 749                 value = -value;
 750                 flags &= ~value;
 751         } else
 752                 flags |= value;
 753         my_ifr.ifr_flags = flags & 0xffff;
 754         my_ifr.ifr_flagshigh = flags >> 16;
 755         if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&my_ifr) < 0)
 756                 Perror(vname);
 757 }
 758
 759 void
 760 setifcap(const char *vname, int value, int s, const struct afswtch *afp)
 761 {
 762
 763         if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) < 0) {
 764                 Perror("ioctl (SIOCGIFCAP)");
 765                 exit(1);
 766         }
 767         flags = ifr.ifr_curcap;
 768         if (value < 0) {
 769                 value = -value;
 770                 flags &= ~value;
 771         } else
 772                 flags |= value;
 773         ifr.ifr_reqcap = flags;
 774         if (ioctl(s, SIOCSIFCAP, (caddr_t)&ifr) < 0)
 775                 Perror(vname);
 776 }
 777
 778 static void
 779 setifmetric(const char *val, int dummy __unused, int s,
 780     const struct afswtch *afp)
 781 {
 782         strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
 783         ifr.ifr_metric = atoi(val);
 784         if (ioctl(s, SIOCSIFMETRIC, (caddr_t)&ifr) < 0)
 785                 warn("ioctl (set metric)");
 786 }
 787
 788 static void
 789 setifmtu(const char *val, int dummy __unused, int s,
 790     const struct afswtch *afp)
 791 {
 792         strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
 793         ifr.ifr_mtu = atoi(val);
 794         if (ioctl(s, SIOCSIFMTU, (caddr_t)&ifr) < 0)
 795                 warn("ioctl (set mtu)");
 796 }
 797
 798 static void
 799 setiftsolen(const char *val, int dummy __unused, int s,
 800     const struct afswtch *afp)
 801 {
 802         strncpy(ifr.ifr_name, name, sizeof (ifr.ifr_name));
 803         ifr.ifr_tsolen = atoi(val);
 804         if (ioctl(s, SIOCSIFTSOLEN, (caddr_t)&ifr) < 0)
 805                 warn("ioctl (set tsolen)");
 806 }
 807
 808 static void
 809 setifname(const char *val, int dummy __unused, int s,
 810     const struct afswtch *afp)
 811 {
 812         char *newname;
 813
 814         newname = strdup(val);
 815         if (newname == NULL) {
 816                 warn("no memory to set ifname");
 817                 return;
 818         }
 819         ifr.ifr_data = newname;
 820         if (ioctl(s, SIOCSIFNAME, (caddr_t)&ifr) < 0) {
 821                 warn("ioctl (set name)");
 822                 free(newname);
 823                 return;
 824         }
 825         strlcpy(name, newname, sizeof(name));
 826         free(newname);
 827
 828         /*
 829          * Even if we just created the interface, we don't need to print
 830          * its name because we just nailed it down separately.
 831          */
 832         printname = 0;
 833 }
 834
 835 static void
 836 setifpollcpu(const char *val, int dummy __unused, int s,
 837     const struct afswtch *afp)
 838 {
 839         warnx("pollcpu is deprecated, use polling or npolling instead");
 840         setifflags("npolling", IFF_NPOLLING, s, afp);
 841 }
 842
 843 /*
 844  * Expand the compacted form of addresses as returned via the
 845  * configuration read via sysctl().
 846  */
 847 static void
 848 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 849 {
 850         struct sockaddr *sa;
 851         int i;
 852
 853         memset(rtinfo->rti_info, 0, sizeof(rtinfo->rti_info));
 854         for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
 855                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 856                         continue;
 857                 rtinfo->rti_info[i] = sa = (struct sockaddr *)cp;
 858                 RT_ADVANCE(cp, sa);
 859         }
 860 }
 861
 862 #define IFFBITS \
 863 "\020\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5POINTOPOINT\6SMART\7RUNNING" \
 864 "\10NOARP\11PROMISC\12ALLMULTI\14SIMPLEX\15LINK0\16LINK1\17LINK2" \
 865 "\20MULTICAST\22PPROMISC\23MONITOR\24STATICARP\25NPOLLING\26IDIRECT"
 866
 867 #define IFCAPBITS \
 868 "\020\1RXCSUM\2TXCSUM\3NETCONS\4VLAN_MTU\5VLAN_HWTAGGING\6JUMBO_MTU\7RSS" \
 869 "\10VLAN_HWCSUM\11TSO"
 870
 871 /*
 872  * Print the status of the interface.  If an address family was
 873  * specified, show only it; otherwise, show them all.
 874  */
 875 static void
 876 status(const struct afswtch *afp, int addrcount, struct sockaddr_dl *sdl,
 877     struct if_msghdr *ifm, struct ifa_msghdr *ifam)
 878 {
 879         struct  rt_addrinfo info;
 880         int allfamilies, s;
 881         struct ifstat ifs;
 882
 883         if (afp == NULL) {
 884                 allfamilies = 1;
 885                 afp = af_getbyname("inet");
 886         } else
 887                 allfamilies = 0;
 888
 889         ifr.ifr_addr.sa_family = afp->af_af == AF_LINK ? AF_INET : afp->af_af;
 890         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 891
 892         s = socket(ifr.ifr_addr.sa_family, SOCK_DGRAM, 0);
 893         if (s < 0)
 894                 err(1, "socket(family %u,SOCK_DGRAM)", ifr.ifr_addr.sa_family);
 895
 896         printf("%s: ", name);
 897         printb("flags", flags, IFFBITS);
 898         if (ifm->ifm_data.ifi_metric)
 899                 printf(" metric %ld", ifm->ifm_data.ifi_metric);
 900         if (ifm->ifm_data.ifi_mtu)
 901                 printf(" mtu %ld", ifm->ifm_data.ifi_mtu);
 902         putchar('\n');
 903
 904         if (ioctl(s, SIOCGIFCAP, (caddr_t)&ifr) == 0) {
 905                 if (ifr.ifr_curcap != 0) {
 906                         printb("\toptions", ifr.ifr_curcap, IFCAPBITS);
 907                         putchar('\n');
 908                 }
 909                 if (supmedia && ifr.ifr_reqcap != 0) {
 910                         printb("\tcapabilities", ifr.ifr_reqcap, IFCAPBITS);
 911                         putchar('\n');
 912                         if (ifr.ifr_reqcap & IFCAP_TSO) {
 913                                 if (ioctl(s, SIOCGIFTSOLEN,
 914                                     (caddr_t)&ifr) == 0) {
 915                                         printf("\ttsolen %d", ifr.ifr_tsolen);
 916                                         putchar('\n');
 917                                 }
 918                         }
 919                 }
 920         }
 921
 922         tunnel_status(s);
 923
 924         while (addrcount > 0) {
 925                 info.rti_addrs = ifam->ifam_addrs;
 926                 /* Expand the compacted addresses */
 927                 rt_xaddrs((char *)(ifam + 1), ifam->ifam_msglen + (char *)ifam,
 928                           &info);
 929
 930                 if (allfamilies) {
 931                         const struct afswtch *p;
 932                         p = af_getbyfamily(info.rti_info[RTAX_IFA]->sa_family);
 933                         if (p != NULL && p->af_status != NULL)
 934                                 p->af_status(s, &info);
 935                 } else if (afp->af_af == info.rti_info[RTAX_IFA]->sa_family)
 936                         afp->af_status(s, &info);
 937                 addrcount--;
 938                 ifam = (struct ifa_msghdr *)((char *)ifam + ifam->ifam_msglen);
 939         }
 940         if (allfamilies || afp->af_af == AF_LINK) {
 941                 const struct afswtch *lafp;
 942
 943                 /*
 944                  * Hack; the link level address is received separately
 945                  * from the routing information so any address is not
 946                  * handled above.  Cobble together an entry and invoke
 947                  * the status method specially.
 948                  */
 949                 lafp = af_getbyname("lladdr");
 950                 if (lafp != NULL) {
 951                         info.rti_info[RTAX_IFA] = (struct sockaddr *)sdl;
 952                         lafp->af_status(s, &info);
 953                 }
 954         }
 955         if (allfamilies)
 956                 af_other_status(s);
 957         else if (afp->af_other_status != NULL)
 958                 afp->af_other_status(s);
 959
 960         strncpy(ifs.ifs_name, name, sizeof ifs.ifs_name);
 961         if (ioctl(s, SIOCGIFSTATUS, &ifs) == 0)
 962                 printf("%s", ifs.ascii);
 963
 964         close(s);
 965         return;
 966 }
 967
 968 static void
 969 tunnel_status(int s)
 970 {
 971         af_all_tunnel_status(s);
 972 }
 973
 974 void
 975 Perror(const char *cmd)
 976 {
 977         switch (errno) {
 978
 979         case ENXIO:
 980                 errx(1, "%s: no such interface", cmd);
 981                 break;
 982
 983         case EPERM:
 984                 errx(1, "%s: permission denied", cmd);
 985                 break;
 986
 987         default:
 988                 err(1, "%s", cmd);
 989         }
 990 }
 991
 992 /*
 993  * Print a value a la the %b format of the kernel's printf
 994  */
 995 void
 996 printb(const char *s, unsigned v, const char *bits)
 997 {
 998         int i, any = 0;
 999         char c;
1000
1001         if (bits && *bits == 8)
1002                 printf("%s=%o", s, v);
1003         else
1004                 printf("%s=%x", s, v);
1005         bits++;
1006         if (bits) {
1007                 putchar('<');
1008                 while ((i = *bits++) != '\0') {
1009                         if (v & (1 << (i-1))) {
1010                                 if (any)
1011                                         putchar(',');
1012                                 any = 1;
1013                                 for (; (c = *bits) > 32; bits++)
1014                                         putchar(c);
1015                         } else
1016                                 for (; *bits > 32; bits++)
1017                                         ;
1018                 }
1019                 putchar('>');
1020         }
1021 }
1022
1023 void
1024 ifmaybeload(const char *name)
1025 {
1026 #define MOD_PREFIX_LEN          3       /* "if_" */
1027         struct module_stat mstat;
1028         int fileid, modid;
1029         char ifkind[IFNAMSIZ + MOD_PREFIX_LEN], ifname[IFNAMSIZ], *dp;
1030         const char *cp;
1031
1032         /* trim the interface number off the end */
1033         strlcpy(ifname, name, sizeof(ifname));
1034         for (dp = ifname; *dp != 0; dp++)
1035                 if (isdigit(*dp)) {
1036                         *dp = 0;
1037                         break;
1038                 }
1039
1040         /* turn interface and unit into module name */
1041         strlcpy(ifkind, "if_", sizeof(ifkind));
1042         strlcat(ifkind, ifname, sizeof(ifkind));
1043
1044         /* scan files in kernel */
1045         mstat.version = sizeof(struct module_stat);
1046         for (fileid = kldnext(0); fileid > 0; fileid = kldnext(fileid)) {
1047                 /* scan modules in file */
1048                 for (modid = kldfirstmod(fileid); modid > 0;
1049                      modid = modfnext(modid)) {
1050                         if (modstat(modid, &mstat) < 0)
1051                                 continue;
1052                         /* strip bus name if present */
1053                         if ((cp = strchr(mstat.name, '/')) != NULL) {
1054                                 cp++;
1055                         } else {
1056                                 cp = mstat.name;
1057                         }
1058                         /* already loaded? */
1059                         if (strcmp(ifname, cp) == 0 ||
1060                             strcmp(ifkind, cp) == 0)
1061                                 return;
1062                 }
1063         }
1064
1065         /* not present, we should try to load it */
1066         kldload(ifkind);
1067 }
1068
1069 static struct cmd basic_cmds[] = {
1070         DEF_CMD("up",           IFF_UP,         setifflags),
1071         DEF_CMD("down",         -IFF_UP,        setifflags),
1072         DEF_CMD("arp",          -IFF_NOARP,     setifflags),
1073         DEF_CMD("-arp",         IFF_NOARP,      setifflags),
1074         DEF_CMD("debug",        IFF_DEBUG,      setifflags),
1075         DEF_CMD("-debug",       -IFF_DEBUG,     setifflags),
1076         DEF_CMD("promisc",      IFF_PPROMISC,   setifflags),
1077         DEF_CMD("-promisc",     -IFF_PPROMISC,  setifflags),
1078         DEF_CMD("add",          IFF_UP,         notealias),
1079         DEF_CMD("alias",        IFF_UP,         notealias),
1080         DEF_CMD("-alias",       -IFF_UP,        notealias),
1081         DEF_CMD("delete",       -IFF_UP,        notealias),
1082         DEF_CMD("remove",       -IFF_UP,        notealias),
1083 #ifdef notdef
1084 #define EN_SWABIPS      0x1000
1085         DEF_CMD("swabips",      EN_SWABIPS,     setifflags),
1086         DEF_CMD("-swabips",     -EN_SWABIPS,    setifflags),
1087 #endif
1088         DEF_CMD_ARG("netmask",                  setifnetmask),
1089         DEF_CMD_ARG("metric",                   setifmetric),
1090         DEF_CMD_ARG("broadcast",                setifbroadaddr),
1091         DEF_CMD_ARG2("tunnel",                  settunnel),
1092         DEF_CMD("-tunnel", 0,                   deletetunnel),
1093         DEF_CMD("deletetunnel", 0,              deletetunnel),
1094         DEF_CMD("link0",        IFF_LINK0,      setifflags),
1095         DEF_CMD("-link0",       -IFF_LINK0,     setifflags),
1096         DEF_CMD("link1",        IFF_LINK1,      setifflags),
1097         DEF_CMD("-link1",       -IFF_LINK1,     setifflags),
1098         DEF_CMD("link2",        IFF_LINK2,      setifflags),
1099         DEF_CMD("-link2",       -IFF_LINK2,     setifflags),
1100         DEF_CMD("monitor",      IFF_MONITOR,    setifflags),
1101         DEF_CMD("-monitor",     -IFF_MONITOR,   setifflags),
1102         DEF_CMD("staticarp",    IFF_STATICARP,  setifflags),
1103         DEF_CMD("-staticarp",   -IFF_STATICARP, setifflags),
1104         DEF_CMD("polling",      IFF_NPOLLING,   setifflags),
1105         DEF_CMD("-polling",     -IFF_NPOLLING,  setifflags),
1106         DEF_CMD("npolling",     IFF_NPOLLING,   setifflags),
1107         DEF_CMD("-npolling",    -IFF_NPOLLING,  setifflags),
1108         DEF_CMD("rxcsum",       IFCAP_RXCSUM,   setifcap),
1109         DEF_CMD("-rxcsum",      -IFCAP_RXCSUM,  setifcap),
1110         DEF_CMD("txcsum",       IFCAP_TXCSUM,   setifcap),
1111         DEF_CMD("-txcsum",      -IFCAP_TXCSUM,  setifcap),
1112         DEF_CMD("netcons",      IFCAP_NETCONS,  setifcap),
1113         DEF_CMD("-netcons",     -IFCAP_NETCONS, setifcap),
1114         DEF_CMD("rss",          IFCAP_RSS,      setifcap),
1115         DEF_CMD("-rss",         -IFCAP_RSS,     setifcap),
1116         DEF_CMD("tso",          IFCAP_TSO,      setifcap),
1117         DEF_CMD("-tso",         -IFCAP_TSO,     setifcap),
1118         DEF_CMD("normal",       -IFF_LINK0,     setifflags),
1119         DEF_CMD("compress",     IFF_LINK0,      setifflags),
1120         DEF_CMD("noicmp",       IFF_LINK1,      setifflags),
1121         DEF_CMD_ARG("mtu",                      setifmtu),
1122         DEF_CMD_ARG("name",                     setifname),
1123         DEF_CMD_ARG("pollcpu",                  setifpollcpu),
1124         DEF_CMD_ARG("tsolen",                   setiftsolen)
1125 };
1126
1127 static __constructor(101) void
1128 ifconfig_ctor(void)
1129 {
1130 #define N(a)    (sizeof(a) / sizeof(a[0]))
1131         int i;
1132
1133         for (i = 0; i < N(basic_cmds);  i++)
1134                 cmd_register(&basic_cmds[i]);
1135 #undef N
1136 }