networking/ifconfig.c

   1 /* ifconfig
   2  *
   3  * Similar to the standard Unix ifconfig, but with only the necessary
   4  * parts for AF_INET, and without any printing of if info (for now).
   5  *
   6  * Bjorn Wesen, Axis Communications AB
   7  *
   8  *
   9  * Authors of the original ifconfig was:
  10  *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  11  *
  12  * This program is free software; you can redistribute it
  13  * and/or  modify it under  the terms of  the GNU General
  14  * Public  License as  published  by  the  Free  Software
  15  * Foundation;  either  version 2 of the License, or  (at
  16  * your option) any later version.
  17  *
  18  * $Id: ifconfig.c,v 1.21 2002/12/27 17:42:01 mjn3 Exp $
  19  *
  20  */
  21
  22 /*
  23  * Heavily modified by Manuel Novoa III       Mar 6, 2001
  24  *
  25  * From initial port to busybox, removed most of the redundancy by
  26  * converting to a table-driven approach.  Added several (optional)
  27  * args missing from initial port.
  28  *
  29  * Still missing:  media, tunnel.
  30  *
  31  * 2002-04-20
  32  * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>             /* strcmp and friends */
  38 #include <ctype.h>              /* isdigit and friends */
  39 #include <stddef.h>             /* offsetof */
  40 #include <sys/ioctl.h>
  41 #include <net/if_arp.h>
  42 #include <netinet/in.h>
  43 #include <linux/if_ether.h>
  44 #include <net/if.h>
  45 #include "inet_common.h"
  46 #include "busybox.h"
  47
  48 #ifdef CONFIG_FEATURE_IFCONFIG_SLIP
  49 # include <linux/if_slip.h>
  50 #endif
  51
  52 /* I don't know if this is needed for busybox or not.  Anyone? */
  53 #define QUESTIONABLE_ALIAS_CASE
  54
  55
  56 /* Defines for glibc2.0 users. */
  57 #ifndef SIOCSIFTXQLEN
  58 # define SIOCSIFTXQLEN      0x8943
  59 # define SIOCGIFTXQLEN      0x8942
  60 #endif
  61
  62 /* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
  63 #ifndef ifr_qlen
  64 # define ifr_qlen        ifr_ifru.ifru_mtu
  65 #endif
  66
  67 #ifndef IFF_DYNAMIC
  68 # define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
  69 #endif
  70
  71 #ifdef CONFIG_FEATURE_IPV6
  72 struct in6_ifreq {
  73         struct in6_addr ifr6_addr;
  74         uint32_t ifr6_prefixlen;
  75         int ifr6_ifindex;
  76 };
  77 #endif
  78
  79 /*
  80  * Here are the bit masks for the "flags" member of struct options below.
  81  * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
  82  * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
  83  */
  84 #define N_CLR            0x01
  85 #define M_CLR            0x02
  86 #define N_SET            0x04
  87 #define M_SET            0x08
  88 #define N_ARG            0x10
  89 #define M_ARG            0x20
  90
  91 #define M_MASK           (M_CLR | M_SET | M_ARG)
  92 #define N_MASK           (N_CLR | N_SET | N_ARG)
  93 #define SET_MASK         (N_SET | M_SET)
  94 #define CLR_MASK         (N_CLR | M_CLR)
  95 #define SET_CLR_MASK     (SET_MASK | CLR_MASK)
  96 #define ARG_MASK         (M_ARG | N_ARG)
  97
  98 /*
  99  * Here are the bit masks for the "arg_flags" member of struct options below.
 100  */
 101
 102 /*
 103  * cast type:
 104  *   00 int
 105  *   01 char *
 106  *   02 HOST_COPY in_ether
 107  *   03 HOST_COPY INET_resolve
 108  */
 109 #define A_CAST_TYPE      0x03
 110 /*
 111  * map type:
 112  *   00 not a map type (mem_start, io_addr, irq)
 113  *   04 memstart (unsigned long)
 114  *   08 io_addr  (unsigned short)
 115  *   0C irq      (unsigned char)
 116  */
 117 #define A_MAP_TYPE       0x0C
 118 #define A_ARG_REQ        0x10   /* Set if an arg is required. */
 119 #define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 120 #define A_SET_AFTER      0x40   /* Set a flag at the end. */
 121 #define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 122 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 123 #define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 124 #define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 125 #else
 126 #define A_HOSTNAME          0
 127 #define A_BROADCAST         0
 128 #endif
 129
 130 /*
 131  * These defines are for dealing with the A_CAST_TYPE field.
 132  */
 133 #define A_CAST_CHAR_PTR  0x01
 134 #define A_CAST_RESOLVE   0x01
 135 #define A_CAST_HOST_COPY 0x02
 136 #define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 137 #define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 138
 139 /*
 140  * These defines are for dealing with the A_MAP_TYPE field.
 141  */
 142 #define A_MAP_ULONG      0x04   /* memstart */
 143 #define A_MAP_USHORT     0x08   /* io_addr */
 144 #define A_MAP_UCHAR      0x0C   /* irq */
 145
 146 /*
 147  * Define the bit masks signifying which operations to perform for each arg.
 148  */
 149
 150 #define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 151 #define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 152 #define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 153 #define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 154 #define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 155 #define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 156 #define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 157 #define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 158 #define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 159 #define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 160 #define ARG_POINTOPOINT  (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 161 #define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 162 #define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 163 #define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 164 #define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 165
 166
 167 /*
 168  * Set up the tables.  Warning!  They must have corresponding order!
 169  */
 170
 171 struct arg1opt {
 172         const char *name;
 173         unsigned short selector;
 174         unsigned short ifr_offset;
 175 };
 176
 177 struct options {
 178         const char *name;
 179 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 180         const unsigned int flags:6;
 181         const unsigned int arg_flags:10;
 182 #else
 183         const unsigned char flags;
 184         const unsigned char arg_flags;
 185 #endif
 186         const unsigned short selector;
 187 };
 188
 189 #define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 190
 191 static const struct arg1opt Arg1Opt[] = {
 192         {"SIOCSIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric)},
 193         {"SIOCSIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu)},
 194         {"SIOCSIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen)},
 195         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 196         {"SIOCSIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask)},
 197         {"SIOCSIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr)},
 198 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 199         {"SIOCSIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr)},
 200 #endif
 201         {"SIOCSIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr)},
 202 #ifdef SIOCSKEEPALIVE
 203         {"SIOCSKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data)},
 204 #endif
 205 #ifdef SIOCSOUTFILL
 206         {"SIOCSOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data)},
 207 #endif
 208 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 209         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start)},
 210         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr)},
 211         {"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq)},
 212 #endif
 213         /* Last entry if for unmatched (possibly hostname) arg. */
 214 #ifdef CONFIG_FEATURE_IPV6
 215         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 216         {"SIOCDIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
 217 #endif
 218         {"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)},
 219 };
 220
 221 static const struct options OptArray[] = {
 222         {"metric",      N_ARG,         ARG_METRIC,      0},
 223         {"mtu",         N_ARG,         ARG_MTU,         0},
 224         {"txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0},
 225         {"dstaddr",     N_ARG,         ARG_DSTADDR,     0},
 226         {"netmask",     N_ARG,         ARG_NETMASK,     0},
 227         {"broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST},
 228 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 229         {"hw",          N_ARG, ARG_HW,                  0},
 230 #endif
 231         {"pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT},
 232 #ifdef SIOCSKEEPALIVE
 233         {"keepalive",   N_ARG,         ARG_KEEPALIVE,   0},
 234 #endif
 235 #ifdef SIOCSOUTFILL
 236         {"outfill",     N_ARG,         ARG_OUTFILL,     0},
 237 #endif
 238 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 239         {"mem_start",   N_ARG,         ARG_MEM_START,   0},
 240         {"io_addr",     N_ARG,         ARG_IO_ADDR,     0},
 241         {"irq",         N_ARG,         ARG_IRQ,         0},
 242 #endif
 243 #ifdef CONFIG_FEATURE_IPV6
 244         {"add",         N_ARG,         ARG_ADD_DEL,     0},
 245         {"del",         N_ARG,         ARG_ADD_DEL,     0},
 246 #endif
 247         {"arp",         N_CLR | M_SET, 0,               IFF_NOARP},
 248         {"trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS},
 249         {"promisc",     N_SET | M_CLR, 0,               IFF_PROMISC},
 250         {"multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST},
 251         {"allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI},
 252         {"dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC},
 253         {"up",          N_SET,         0,               (IFF_UP | IFF_RUNNING)},
 254         {"down",        N_CLR,         0,               IFF_UP},
 255         {NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING)}
 256 };
 257
 258 /*
 259  * A couple of prototypes.
 260  */
 261
 262 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 263 static int in_ether(char *bufp, struct sockaddr *sap);
 264 #endif
 265
 266 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 267 extern int interface_opt_a;
 268 extern int display_interfaces(char *ifname);
 269 #endif
 270
 271 /*
 272  * Our main function.
 273  */
 274
 275 int ifconfig_main(int argc, char **argv)
 276 {
 277         struct ifreq ifr;
 278         struct sockaddr_in sai;
 279 #ifdef CONFIG_FEATURE_IPV6
 280         struct sockaddr_in6 sai6;
 281 #endif
 282 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 283         struct sockaddr sa;
 284 #endif
 285         const struct arg1opt *a1op;
 286         const struct options *op;
 287         int sockfd;                     /* socket fd we use to manipulate stuff with */
 288         int goterr;
 289         int selector;
 290 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 291         unsigned int mask;
 292         unsigned int did_flags;
 293         in_addr_t sai_hostname, sai_netmask;
 294 #else
 295         unsigned char mask;
 296         unsigned char did_flags;
 297 #endif
 298         char *p;
 299         char host[128];
 300
 301         goterr = 0;
 302         did_flags = 0;
 303
 304         /* skip argv[0] */
 305         ++argv;
 306         --argc;
 307
 308 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 309         if ((argc > 0) && (((*argv)[0] == '-') && ((*argv)[1] == 'a') && !(*argv)[2])) {
 310                 interface_opt_a = 1;
 311                 --argc;
 312                 ++argv;
 313         }
 314 #endif
 315
 316         if (argc <= 1) {
 317 #ifdef CONFIG_FEATURE_IFCONFIG_STATUS
 318                 return display_interfaces(argc ? *argv : NULL);
 319 #else
 320                 error_msg_and_die
 321                         ("ifconfig was not compiled with interface status display support.");
 322 #endif
 323         }
 324
 325         /* Create a channel to the NET kernel. */
 326         if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 327                 perror_msg_and_die("socket");
 328         }
 329
 330         /* get interface name */
 331         safe_strncpy(ifr.ifr_name, *argv, IFNAMSIZ);
 332
 333         /* Process the remaining arguments. */
 334         while (*++argv != (char *) NULL) {
 335                 p = *argv;
 336                 mask = N_MASK;
 337                 if (*p == '-') {        /* If the arg starts with '-'... */
 338                         ++p;            /*    advance past it and */
 339                         mask = M_MASK;  /*    set the appropriate mask. */
 340                 }
 341                 for (op = OptArray; op->name; op++) {   /* Find table entry. */
 342                         if (strcmp(p, op->name) == 0) { /* If name matches... */
 343                                 if ((mask &= op->flags)) {      /* set the mask and go. */
 344                                         goto FOUND_ARG;;
 345                                 }
 346                                 /* If we get here, there was a valid arg with an */
 347                                 /* invalid '-' prefix. */
 348                                 ++goterr;
 349                                 goto LOOP;
 350                         }
 351                 }
 352
 353                 /* We fell through, so treat as possible hostname. */
 354                 a1op = Arg1Opt + (sizeof(Arg1Opt) / sizeof(Arg1Opt[0])) - 1;
 355                 mask = op->arg_flags;
 356                 goto HOSTNAME;
 357
 358           FOUND_ARG:
 359                 if (mask & ARG_MASK) {
 360                         mask = op->arg_flags;
 361                         a1op = Arg1Opt + (op - OptArray);
 362                         if (mask & A_NETMASK & did_flags) {
 363                                 show_usage();
 364                         }
 365                         if (*++argv == NULL) {
 366                                 if (mask & A_ARG_REQ) {
 367                                         show_usage();
 368                                 } else {
 369                                         --argv;
 370                                         mask &= A_SET_AFTER;    /* just for broadcast */
 371                                 }
 372                         } else {        /* got an arg so process it */
 373                           HOSTNAME:
 374                                 did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 375                                 if (mask & A_CAST_HOST_COPY) {
 376 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 377                                         if (mask & A_CAST_RESOLVE) {
 378 #endif
 379 #ifdef CONFIG_FEATURE_IPV6
 380                                                 char *prefix;
 381                                                 int prefix_len = 0;
 382 #endif
 383
 384                                                 safe_strncpy(host, *argv, (sizeof host));
 385 #ifdef CONFIG_FEATURE_IPV6
 386                                                 if ((prefix = strchr(host, '/'))) {
 387                                                         prefix_len = atol(prefix + 1);
 388                                                         if ((prefix_len < 0) || (prefix_len > 128)) {
 389                                                                 ++goterr;
 390                                                                 goto LOOP;
 391                                                         }
 392                                                         *prefix = 0;
 393                                                 }
 394 #endif
 395
 396                                                 sai.sin_family = AF_INET;
 397                                                 sai.sin_port = 0;
 398                                                 if (!strcmp(host, bb_INET_default)) {
 399                                                         /* Default is special, meaning 0.0.0.0. */
 400                                                         sai.sin_addr.s_addr = INADDR_ANY;
 401 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 402                                                 } else if (((host[0] == '+') && !host[1]) && (mask & A_BROADCAST) &&
 403                                                                    (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)) {
 404                                                         /* + is special, meaning broadcast is derived. */
 405                                                         sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 406 #endif
 407 #ifdef CONFIG_FEATURE_IPV6
 408                                                 } else if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
 409                                                         int sockfd6;
 410                                                         struct in6_ifreq ifr6;
 411
 412                                                         memcpy((char *) &ifr6.ifr6_addr,
 413                                                                    (char *) &sai6.sin6_addr,
 414                                                                    sizeof(struct in6_addr));
 415
 416                                                         /* Create a channel to the NET kernel. */
 417                                                         if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
 418                                                                 perror_msg_and_die("socket6");
 419                                                         }
 420                                                         if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
 421                                                                 perror("SIOGIFINDEX");
 422                                                                 ++goterr;
 423                                                                 continue;
 424                                                         }
 425                                                         ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 426                                                         ifr6.ifr6_prefixlen = prefix_len;
 427                                                         if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
 428                                                                 perror(a1op->name);
 429                                                                 ++goterr;
 430                                                         }
 431                                                         continue;
 432 #endif
 433                                                 } else if (inet_aton(host, &sai.sin_addr) == 0) {
 434                                                         /* It's not a dotted quad. */
 435                                                         ++goterr;
 436                                                         continue;
 437                                                 }
 438 #ifdef CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS
 439                                                 if (mask & A_HOSTNAME) {
 440                                                         sai_hostname = sai.sin_addr.s_addr;
 441                                                 }
 442                                                 if (mask & A_NETMASK) {
 443                                                         sai_netmask = sai.sin_addr.s_addr;
 444                                                 }
 445 #endif
 446                                                 p = (char *) &sai;
 447 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 448                                         } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 449                                                 /* This is the "hw" arg case. */
 450                                                 if (strcmp("ether", *argv) || (*++argv == NULL)) {
 451                                                         show_usage();
 452                                                 }
 453                                                 safe_strncpy(host, *argv, (sizeof host));
 454                                                 if (in_ether(host, &sa)) {
 455                                                         error_msg("invalid hw-addr %s", host);
 456                                                         ++goterr;
 457                                                         continue;
 458                                                 }
 459                                                 p = (char *) &sa;
 460                                         }
 461 #endif
 462                                         memcpy((((char *) (&ifr)) + a1op->ifr_offset),
 463                                                    p, sizeof(struct sockaddr));
 464                                 } else {
 465                                         unsigned int i = strtoul(*argv, NULL, 0);
 466
 467                                         p = ((char *) (&ifr)) + a1op->ifr_offset;
 468 #ifdef CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 469                                         if (mask & A_MAP_TYPE) {
 470                                                 if (ioctl(sockfd, SIOCGIFMAP, &ifr) < 0) {
 471                                                         ++goterr;
 472                                                         continue;
 473                                                 }
 474                                                 if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR) {
 475                                                         *((unsigned char *) p) = i;
 476                                                 } else if (mask & A_MAP_USHORT) {
 477                                                         *((unsigned short *) p) = i;
 478                                                 } else {
 479                                                         *((unsigned long *) p) = i;
 480                                                 }
 481                                         } else
 482 #endif
 483                                         if (mask & A_CAST_CHAR_PTR) {
 484                                                 *((caddr_t *) p) = (caddr_t) i;
 485                                         } else {        /* A_CAST_INT */
 486                                                 *((int *) p) = i;
 487                                         }
 488                                 }
 489
 490                                 if (ioctl(sockfd, a1op->selector, &ifr) < 0) {
 491                                         perror(a1op->name);
 492                                         ++goterr;
 493                                         continue;
 494                                 }
 495 #ifdef QUESTIONABLE_ALIAS_CASE
 496                                 if (mask & A_COLON_CHK) {
 497                                         /*
 498                                          * Don't do the set_flag() if the address is an alias with
 499                                          * a - at the end, since it's deleted already! - Roman
 500                                          *
 501                                          * Should really use regex.h here, not sure though how well
 502                                          * it'll go with the cross-platform support etc.
 503                                          */
 504                                         char *ptr;
 505                                         short int found_colon = 0;
 506
 507                                         for (ptr = ifr.ifr_name; *ptr; ptr++) {
 508                                                 if (*ptr == ':') {
 509                                                         found_colon++;
 510                                                 }
 511                                         }
 512
 513                                         if (found_colon && *(ptr - 1) == '-') {
 514                                                 continue;
 515                                         }
 516                                 }
 517 #endif
 518                         }
 519                         if (!(mask & A_SET_AFTER)) {
 520                                 continue;
 521                         }
 522                         mask = N_SET;
 523                 }
 524
 525                 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
 526                         perror("SIOCGIFFLAGS");
 527                         ++goterr;
 528                 } else {
 529                         selector = op->selector;
 530                         if (mask & SET_MASK) {
 531                                 ifr.ifr_flags |= selector;
 532                         } else {
 533                                 ifr.ifr_flags &= ~selector;
 534                         }
 535                         if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
 536                                 perror("SIOCSIFFLAGS");
 537                                 ++goterr;
 538                         }
 539                 }
 540           LOOP:
 541                 continue;
 542         }                                       /* end of while-loop */
 543
 544         return goterr;
 545 }
 546
 547 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 548 /* Input an Ethernet address and convert to binary. */
 549 static int in_ether(char *bufp, struct sockaddr *sap)
 550 {
 551         unsigned char *ptr;
 552         int i, j;
 553         unsigned char val;
 554         unsigned char c;
 555
 556         sap->sa_family = ARPHRD_ETHER;
 557         ptr = sap->sa_data;
 558
 559         i = 0;
 560         do {
 561                 j = val = 0;
 562
 563                 /* We might get a semicolon here - not required. */
 564                 if (i && (*bufp == ':')) {
 565                         bufp++;
 566                 }
 567
 568                 do {
 569                         c = *bufp;
 570                         if (((unsigned char)(c - '0')) <= 9) {
 571                                 c -= '0';
 572                         } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
 573                                 c = (c|0x20) - ('a'-10);
 574                         } else if (j && (c == ':' || c == 0)) {
 575                                 break;
 576                         } else {
 577                                 return -1;
 578                         }
 579                         ++bufp;
 580                         val <<= 4;
 581                         val += c;
 582                 } while (++j < 2);
 583                 *ptr++ = val;
 584         } while (++i < ETH_ALEN);
 585
 586         return (int) (*bufp);   /* Error if we don't end at end of string. */
 587 }
 588 #endif