LXR busybox/networking/ifconfig.c

   1/* vi: set sw=4 ts=4: */
   2/* ifconfig
   3 *
   4 * Similar to the standard Unix ifconfig, but with only the necessary
   5 * parts for AF_INET, and without any printing of if info (for now).
   6 *
   7 * Bjorn Wesen, Axis Communications AB
   8 *
   9 *
  10 * Authors of the original ifconfig was:
  11 *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  12 *
  13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  14 */
  15
  16/*
  17 * Heavily modified by Manuel Novoa III       Mar 6, 2001
  18 *
  19 * From initial port to busybox, removed most of the redundancy by
  20 * converting to a table-driven approach.  Added several (optional)
  21 * args missing from initial port.
  22 *
  23 * Still missing:  media, tunnel.
  24 *
  25 * 2002-04-20
  26 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  27 */
  28
  29#include <net/if.h>
  30#include <net/if_arp.h>
  31#include <netinet/in.h>
  32#if defined(__GLIBC__) && __GLIBC__ >=2 && __GLIBC_MINOR__ >= 1
  33#include <netpacket/packet.h>
  34#include <net/ethernet.h>
  35#else
  36#include <sys/types.h>
  37#include <netinet/if_ether.h>
  38#endif
  39#include "libbb.h"
  40#include "inet_common.h"
  41
  42#if ENABLE_FEATURE_IFCONFIG_SLIP
  43# include <net/if_slip.h>
  44#endif
  45
  46/* I don't know if this is needed for busybox or not.  Anyone? */
  47#define QUESTIONABLE_ALIAS_CASE
  48
  49
  50/* Defines for glibc2.0 users. */
  51#ifndef SIOCSIFTXQLEN
  52# define SIOCSIFTXQLEN      0x8943
  53# define SIOCGIFTXQLEN      0x8942
  54#endif
  55
  56/* ifr_qlen is ifru_ivalue, but it isn't present in 2.0 kernel headers */
  57#ifndef ifr_qlen
  58# define ifr_qlen        ifr_ifru.ifru_mtu
  59#endif
  60
  61#ifndef IFF_DYNAMIC
  62# define IFF_DYNAMIC     0x8000 /* dialup device with changing addresses */
  63#endif
  64
  65#if ENABLE_FEATURE_IPV6
  66struct in6_ifreq {
  67        struct in6_addr ifr6_addr;
  68        uint32_t ifr6_prefixlen;
  69        int ifr6_ifindex;
  70};
  71#endif
  72
  73/*
  74 * Here are the bit masks for the "flags" member of struct options below.
  75 * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
  76 * CLR clears the flag; SET sets the flag; ARG signifies (optional) arg.
  77 */
  78#define N_CLR            0x01
  79#define M_CLR            0x02
  80#define N_SET            0x04
  81#define M_SET            0x08
  82#define N_ARG            0x10
  83#define M_ARG            0x20
  84
  85#define M_MASK           (M_CLR | M_SET | M_ARG)
  86#define N_MASK           (N_CLR | N_SET | N_ARG)
  87#define SET_MASK         (N_SET | M_SET)
  88#define CLR_MASK         (N_CLR | M_CLR)
  89#define SET_CLR_MASK     (SET_MASK | CLR_MASK)
  90#define ARG_MASK         (M_ARG | N_ARG)
  91
  92/*
  93 * Here are the bit masks for the "arg_flags" member of struct options below.
  94 */
  95
  96/*
  97 * cast type:
  98 *   00 int
  99 *   01 char *
 100 *   02 HOST_COPY in_ether
 101 *   03 HOST_COPY INET_resolve
 102 */
 103#define A_CAST_TYPE      0x03
 104/*
 105 * map type:
 106 *   00 not a map type (mem_start, io_addr, irq)
 107 *   04 memstart (unsigned long)
 108 *   08 io_addr  (unsigned short)
 109 *   0C irq      (unsigned char)
 110 */
 111#define A_MAP_TYPE       0x0C
 112#define A_ARG_REQ        0x10   /* Set if an arg is required. */
 113#define A_NETMASK        0x20   /* Set if netmask (check for multiple sets). */
 114#define A_SET_AFTER      0x40   /* Set a flag at the end. */
 115#define A_COLON_CHK      0x80   /* Is this needed?  See below. */
 116#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 117#define A_HOSTNAME      0x100   /* Set if it is ip addr. */
 118#define A_BROADCAST     0x200   /* Set if it is broadcast addr. */
 119#else
 120#define A_HOSTNAME          0
 121#define A_BROADCAST         0
 122#endif
 123
 124/*
 125 * These defines are for dealing with the A_CAST_TYPE field.
 126 */
 127#define A_CAST_CHAR_PTR  0x01
 128#define A_CAST_RESOLVE   0x01
 129#define A_CAST_HOST_COPY 0x02
 130#define A_CAST_HOST_COPY_IN_ETHER    A_CAST_HOST_COPY
 131#define A_CAST_HOST_COPY_RESOLVE     (A_CAST_HOST_COPY | A_CAST_RESOLVE)
 132
 133/*
 134 * These defines are for dealing with the A_MAP_TYPE field.
 135 */
 136#define A_MAP_ULONG      0x04   /* memstart */
 137#define A_MAP_USHORT     0x08   /* io_addr */
 138#define A_MAP_UCHAR      0x0C   /* irq */
 139
 140/*
 141 * Define the bit masks signifying which operations to perform for each arg.
 142 */
 143
 144#define ARG_METRIC       (A_ARG_REQ /*| A_CAST_INT*/)
 145#define ARG_MTU          (A_ARG_REQ /*| A_CAST_INT*/)
 146#define ARG_TXQUEUELEN   (A_ARG_REQ /*| A_CAST_INT*/)
 147#define ARG_MEM_START    (A_ARG_REQ | A_MAP_ULONG)
 148#define ARG_IO_ADDR      (A_ARG_REQ | A_MAP_ULONG)
 149#define ARG_IRQ          (A_ARG_REQ | A_MAP_UCHAR)
 150#define ARG_DSTADDR      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE)
 151#define ARG_NETMASK      (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_NETMASK)
 152#define ARG_BROADCAST    (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_BROADCAST)
 153#define ARG_HW           (A_ARG_REQ | A_CAST_HOST_COPY_IN_ETHER)
 154#define ARG_POINTOPOINT  (A_ARG_REQ | A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 155#define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 156#define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 157#define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK | A_HOSTNAME)
 158#define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 159
 160
 161/*
 162 * Set up the tables.  Warning!  They must have corresponding order!
 163 */
 164
 165struct arg1opt {
 166        const char *name;
 167        unsigned short selector;
 168        unsigned short ifr_offset;
 169};
 170
 171struct options {
 172        const char *name;
 173#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 174        const unsigned int flags:6;
 175        const unsigned int arg_flags:10;
 176#else
 177        const unsigned char flags;
 178        const unsigned char arg_flags;
 179#endif
 180        const unsigned short selector;
 181};
 182
 183#define ifreq_offsetof(x)  offsetof(struct ifreq, x)
 184
 185static const struct arg1opt Arg1Opt[] = {
 186        { "SIFMETRIC",  SIOCSIFMETRIC,  ifreq_offsetof(ifr_metric) },
 187        { "SIFMTU",     SIOCSIFMTU,     ifreq_offsetof(ifr_mtu) },
 188        { "SIFTXQLEN",  SIOCSIFTXQLEN,  ifreq_offsetof(ifr_qlen) },
 189        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 190        { "SIFNETMASK", SIOCSIFNETMASK, ifreq_offsetof(ifr_netmask) },
 191        { "SIFBRDADDR", SIOCSIFBRDADDR, ifreq_offsetof(ifr_broadaddr) },
 192#if ENABLE_FEATURE_IFCONFIG_HW
 193        { "SIFHWADDR",  SIOCSIFHWADDR,  ifreq_offsetof(ifr_hwaddr) },
 194#endif
 195        { "SIFDSTADDR", SIOCSIFDSTADDR, ifreq_offsetof(ifr_dstaddr) },
 196#ifdef SIOCSKEEPALIVE
 197        { "SKEEPALIVE", SIOCSKEEPALIVE, ifreq_offsetof(ifr_data) },
 198#endif
 199#ifdef SIOCSOUTFILL
 200        { "SOUTFILL",   SIOCSOUTFILL,   ifreq_offsetof(ifr_data) },
 201#endif
 202#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 203        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.mem_start) },
 204        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.base_addr) },
 205        { "SIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq) },
 206#endif
 207        /* Last entry if for unmatched (possibly hostname) arg. */
 208#if ENABLE_FEATURE_IPV6
 209        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 210        { "DIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr) }, /* IPv6 version ignores the offset */
 211#endif
 212        { "SIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr) },
 213};
 214
 215static const struct options OptArray[] = {
 216        { "metric",      N_ARG,         ARG_METRIC,      0 },
 217        { "mtu",         N_ARG,         ARG_MTU,         0 },
 218        { "txqueuelen",  N_ARG,         ARG_TXQUEUELEN,  0 },
 219        { "dstaddr",     N_ARG,         ARG_DSTADDR,     0 },
 220        { "netmask",     N_ARG,         ARG_NETMASK,     0 },
 221        { "broadcast",   N_ARG | M_CLR, ARG_BROADCAST,   IFF_BROADCAST },
 222#if ENABLE_FEATURE_IFCONFIG_HW
 223        { "hw",          N_ARG,         ARG_HW,          0 },
 224#endif
 225        { "pointopoint", N_ARG | M_CLR, ARG_POINTOPOINT, IFF_POINTOPOINT },
 226#ifdef SIOCSKEEPALIVE
 227        { "keepalive",   N_ARG,         ARG_KEEPALIVE,   0 },
 228#endif
 229#ifdef SIOCSOUTFILL
 230        { "outfill",     N_ARG,         ARG_OUTFILL,     0 },
 231#endif
 232#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 233        { "mem_start",   N_ARG,         ARG_MEM_START,   0 },
 234        { "io_addr",     N_ARG,         ARG_IO_ADDR,     0 },
 235        { "irq",         N_ARG,         ARG_IRQ,         0 },
 236#endif
 237#if ENABLE_FEATURE_IPV6
 238        { "add",         N_ARG,         ARG_ADD_DEL,     0 },
 239        { "del",         N_ARG,         ARG_ADD_DEL,     0 },
 240#endif
 241        { "arp",         N_CLR | M_SET, 0,               IFF_NOARP },
 242        { "trailers",    N_CLR | M_SET, 0,               IFF_NOTRAILERS },
 243        { "promisc",     N_SET | M_CLR, 0,               IFF_PROMISC },
 244        { "multicast",   N_SET | M_CLR, 0,               IFF_MULTICAST },
 245        { "allmulti",    N_SET | M_CLR, 0,               IFF_ALLMULTI },
 246        { "dynamic",     N_SET | M_CLR, 0,               IFF_DYNAMIC },
 247        { "up",          N_SET,         0,               (IFF_UP | IFF_RUNNING) },
 248        { "down",        N_CLR,         0,               IFF_UP },
 249        { NULL,          0,             ARG_HOSTNAME,    (IFF_UP | IFF_RUNNING) }
 250};
 251
 252/*
 253 * A couple of prototypes.
 254 */
 255#if ENABLE_FEATURE_IFCONFIG_HW
 256static int in_ether(const char *bufp, struct sockaddr *sap);
 257#endif
 258
 259/*
 260 * Our main function.
 261 */
 262int ifconfig_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 263int ifconfig_main(int argc UNUSED_PARAM, char **argv)
 264{
 265        struct ifreq ifr;
 266        struct sockaddr_in sai;
 267#if ENABLE_FEATURE_IFCONFIG_HW
 268        struct sockaddr sa;
 269#endif
 270        const struct arg1opt *a1op;
 271        const struct options *op;
 272        int sockfd;                     /* socket fd we use to manipulate stuff with */
 273        int selector;
 274#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 275        unsigned int mask;
 276        unsigned int did_flags;
 277        unsigned int sai_hostname, sai_netmask;
 278#else
 279        unsigned char mask;
 280        unsigned char did_flags;
 281#endif
 282        char *p;
 283        /*char host[128];*/
 284        const char *host = NULL; /* make gcc happy */
 285
 286        did_flags = 0;
 287#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 288        sai_hostname = 0;
 289        sai_netmask = 0;
 290#endif
 291
 292        /* skip argv[0] */
 293        ++argv;
 294
 295#if ENABLE_FEATURE_IFCONFIG_STATUS
 296        if (argv[0] && (argv[0][0] == '-' && argv[0][1] == 'a' && !argv[0][2])) {
 297                interface_opt_a = 1;
 298                ++argv;
 299        }
 300#endif
 301
 302        if (!argv[0] || !argv[1]) { /* one or no args */
 303#if ENABLE_FEATURE_IFCONFIG_STATUS
 304                return display_interfaces(argv[0] /* can be NULL */);
 305#else
 306                bb_error_msg_and_die("no support for status display");
 307#endif
 308        }
 309
 310        /* Create a channel to the NET kernel. */
 311        sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
 312
 313        /* get interface name */
 314        strncpy_IFNAMSIZ(ifr.ifr_name, *argv);
 315
 316        /* Process the remaining arguments. */
 317        while (*++argv != (char *) NULL) {
 318                p = *argv;
 319                mask = N_MASK;
 320                if (*p == '-') {        /* If the arg starts with '-'... */
 321                        ++p;            /*    advance past it and */
 322                        mask = M_MASK;  /*    set the appropriate mask. */
 323                }
 324                for (op = OptArray; op->name; op++) {   /* Find table entry. */
 325                        if (strcmp(p, op->name) == 0) { /* If name matches... */
 326                                mask &= op->flags;
 327                                if (mask)       /* set the mask and go. */
 328                                        goto FOUND_ARG;
 329                                /* If we get here, there was a valid arg with an */
 330                                /* invalid '-' prefix. */
 331                                bb_error_msg_and_die("bad: '%s'", p-1);
 332                        }
 333                }
 334
 335                /* We fell through, so treat as possible hostname. */
 336                a1op = Arg1Opt + ARRAY_SIZE(Arg1Opt) - 1;
 337                mask = op->arg_flags;
 338                goto HOSTNAME;
 339
 340 FOUND_ARG:
 341                if (mask & ARG_MASK) {
 342                        mask = op->arg_flags;
 343                        a1op = Arg1Opt + (op - OptArray);
 344                        if (mask & A_NETMASK & did_flags)
 345                                bb_show_usage();
 346                        if (*++argv == NULL) {
 347                                if (mask & A_ARG_REQ)
 348                                        bb_show_usage();
 349                                --argv;
 350                                mask &= A_SET_AFTER;    /* just for broadcast */
 351                        } else {        /* got an arg so process it */
 352 HOSTNAME:
 353                                did_flags |= (mask & (A_NETMASK|A_HOSTNAME));
 354                                if (mask & A_CAST_HOST_COPY) {
 355#if ENABLE_FEATURE_IFCONFIG_HW
 356                                        if (mask & A_CAST_RESOLVE) {
 357#endif
 358#if ENABLE_FEATURE_IPV6
 359                                                char *prefix;
 360                                                int prefix_len = 0;
 361#endif
 362                                                /*safe_strncpy(host, *argv, (sizeof host));*/
 363                                                host = *argv;
 364#if ENABLE_FEATURE_IPV6
 365                                                prefix = strchr(host, '/');
 366                                                if (prefix) {
 367                                                        prefix_len = xatou_range(prefix + 1, 0, 128);
 368                                                        *prefix = '\0';
 369                                                }
 370#endif
 371                                                sai.sin_family = AF_INET;
 372                                                sai.sin_port = 0;
 373                                                if (!strcmp(host, bb_str_default)) {
 374                                                        /* Default is special, meaning 0.0.0.0. */
 375                                                        sai.sin_addr.s_addr = INADDR_ANY;
 376                                                }
 377#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 378                                                else if ((host[0] == '+' && !host[1]) && (mask & A_BROADCAST)
 379                                                 && (did_flags & (A_NETMASK|A_HOSTNAME)) == (A_NETMASK|A_HOSTNAME)
 380                                                ) {
 381                                                        /* + is special, meaning broadcast is derived. */
 382                                                        sai.sin_addr.s_addr = (~sai_netmask) | (sai_hostname & sai_netmask);
 383                                                }
 384#endif
 385                                                else {
 386                                                        len_and_sockaddr *lsa;
 387                                                        if (strcmp(host, "inet") == 0)
 388                                                                continue; /* compat stuff */
 389                                                        lsa = xhost2sockaddr(host, 0);
 390#if ENABLE_FEATURE_IPV6
 391                                                        if (lsa->u.sa.sa_family == AF_INET6) {
 392                                                                int sockfd6;
 393                                                                struct in6_ifreq ifr6;
 394
 395                                                                memcpy((char *) &ifr6.ifr6_addr,
 396                                                                                (char *) &(lsa->u.sin6.sin6_addr),
 397                                                                                sizeof(struct in6_addr));
 398
 399                                                                /* Create a channel to the NET kernel. */
 400                                                                sockfd6 = xsocket(AF_INET6, SOCK_DGRAM, 0);
 401                                                                xioctl(sockfd6, SIOGIFINDEX, &ifr);
 402                                                                ifr6.ifr6_ifindex = ifr.ifr_ifindex;
 403                                                                ifr6.ifr6_prefixlen = prefix_len;
 404                                                                ioctl_or_perror_and_die(sockfd6, a1op->selector, &ifr6, "SIOC%s", a1op->name);
 405                                                                if (ENABLE_FEATURE_CLEAN_UP)
 406                                                                        free(lsa);
 407                                                                continue;
 408                                                        }
 409#endif
 410                                                        sai.sin_addr = lsa->u.sin.sin_addr;
 411                                                        if (ENABLE_FEATURE_CLEAN_UP)
 412                                                                free(lsa);
 413                                                }
 414#if ENABLE_FEATURE_IFCONFIG_BROADCAST_PLUS
 415                                                if (mask & A_HOSTNAME)
 416                                                        sai_hostname = sai.sin_addr.s_addr;
 417                                                if (mask & A_NETMASK)
 418                                                        sai_netmask = sai.sin_addr.s_addr;
 419#endif
 420                                                p = (char *) &sai;
 421#if ENABLE_FEATURE_IFCONFIG_HW
 422                                        } else {        /* A_CAST_HOST_COPY_IN_ETHER */
 423                                                /* This is the "hw" arg case. */
 424                                                smalluint hw_class= index_in_substrings("ether\0"
 425                                                                IF_FEATURE_HWIB("infiniband\0"), *argv) + 1;
 426                                                if (!hw_class || !*++argv)
 427                                                        bb_show_usage();
 428                                                /*safe_strncpy(host, *argv, sizeof(host));*/
 429                                                host = *argv;
 430                                                if (hw_class == 1 ? in_ether(host, &sa) : in_ib(host, &sa))
 431                                                        bb_error_msg_and_die("invalid hw-addr %s", host);
 432                                                p = (char *) &sa;
 433                                        }
 434#endif
 435                                        memcpy( (((char *)&ifr) + a1op->ifr_offset),
 436                                                   p, sizeof(struct sockaddr));
 437                                } else {
 438                                        /* FIXME: error check?? */
 439                                        unsigned long i = strtoul(*argv, NULL, 0);
 440                                        p = ((char *)&ifr) + a1op->ifr_offset;
 441#if ENABLE_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ
 442                                        if (mask & A_MAP_TYPE) {
 443                                                xioctl(sockfd, SIOCGIFMAP, &ifr);
 444                                                if ((mask & A_MAP_UCHAR) == A_MAP_UCHAR)
 445                                                        *((unsigned char *) p) = i;
 446                                                else if (mask & A_MAP_USHORT)
 447                                                        *((unsigned short *) p) = i;
 448                                                else
 449                                                        *((unsigned long *) p) = i;
 450                                        } else
 451#endif
 452                                        if (mask & A_CAST_CHAR_PTR)
 453                                                *((caddr_t *) p) = (caddr_t) i;
 454                                        else    /* A_CAST_INT */
 455                                                *((int *) p) = i;
 456                                }
 457
 458                                ioctl_or_perror_and_die(sockfd, a1op->selector, &ifr, "SIOC%s", a1op->name);
 459#ifdef QUESTIONABLE_ALIAS_CASE
 460                                if (mask & A_COLON_CHK) {
 461                                        /*
 462                                         * Don't do the set_flag() if the address is an alias with
 463                                         * a '-' at the end, since it's deleted already! - Roman
 464                                         *
 465                                         * Should really use regex.h here, not sure though how well
 466                                         * it'll go with the cross-platform support etc.
 467                                         */
 468                                        char *ptr;
 469                                        short int found_colon = 0;
 470                                        for (ptr = ifr.ifr_name; *ptr; ptr++)
 471                                                if (*ptr == ':')
 472                                                        found_colon++;
 473                                        if (found_colon && ptr[-1] == '-')
 474                                                continue;
 475                                }
 476#endif
 477                        }
 478                        if (!(mask & A_SET_AFTER))
 479                                continue;
 480                        mask = N_SET;
 481                }
 482
 483                xioctl(sockfd, SIOCGIFFLAGS, &ifr);
 484                selector = op->selector;
 485                if (mask & SET_MASK)
 486                        ifr.ifr_flags |= selector;
 487                else
 488                        ifr.ifr_flags &= ~selector;
 489                xioctl(sockfd, SIOCSIFFLAGS, &ifr);
 490        } /* while () */
 491
 492        if (ENABLE_FEATURE_CLEAN_UP)
 493                close(sockfd);
 494        return 0;
 495}
 496
 497#if ENABLE_FEATURE_IFCONFIG_HW
 498/* Input an Ethernet address and convert to binary. */
 499static int in_ether(const char *bufp, struct sockaddr *sap)
 500{
 501        char *ptr;
 502        int i, j;
 503        unsigned char val;
 504        unsigned char c;
 505
 506        sap->sa_family = ARPHRD_ETHER;
 507        ptr = (char *) sap->sa_data;
 508
 509        i = 0;
 510        do {
 511                j = val = 0;
 512
 513                /* We might get a semicolon here - not required. */
 514                if (i && (*bufp == ':')) {
 515                        bufp++;
 516                }
 517
 518                do {
 519                        c = *bufp;
 520                        if (((unsigned char)(c - '0')) <= 9) {
 521                                c -= '0';
 522                        } else if (((unsigned char)((c|0x20) - 'a')) <= 5) {
 523                                c = (c|0x20) - ('a'-10);
 524                        } else if (j && (c == ':' || c == 0)) {
 525                                break;
 526                        } else {
 527                                return -1;
 528                        }
 529                        ++bufp;
 530                        val <<= 4;
 531                        val += c;
 532                } while (++j < 2);
 533                *ptr++ = val;
 534        } while (++i < ETH_ALEN);
 535
 536        return *bufp; /* Error if we don't end at end of string. */
 537}
 538#endif
 539