networking/libiproute/ipaddress.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4  *
   5  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  * Changes:
   8  * Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated
   9  */
  10
  11 #include <fnmatch.h>
  12 #include <net/if.h>
  13 #include <net/if_arp.h>
  14
  15 #include "ip_common.h"  /* #include "libbb.h" is inside */
  16 #include "rt_names.h"
  17 #include "utils.h"
  18
  19 #ifndef IFF_LOWER_UP
  20 /* from linux/if.h */
  21 #define IFF_LOWER_UP  0x10000  /* driver signals L1 up */
  22 #endif
  23
  24 struct filter_t {
  25         char *label;
  26         char *flushb;
  27         struct rtnl_handle *rth;
  28         int scope, scopemask;
  29         int flags, flagmask;
  30         int flushp;
  31         int flushe;
  32         int ifindex;
  33         family_t family;
  34         smallint showqueue;
  35         smallint oneline;
  36         smallint up;
  37         smallint flushed;
  38         inet_prefix pfx;
  39 } FIX_ALIASING;
  40 typedef struct filter_t filter_t;
  41
  42 #define G_filter (*(filter_t*)&bb_common_bufsiz1)
  43
  44
  45 static void print_link_flags(unsigned flags, unsigned mdown)
  46 {
  47         static const int flag_masks[] = {
  48                 IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
  49                 IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
  50         static const char flag_labels[] ALIGN1 =
  51                 "LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
  52                 "MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";
  53
  54         bb_putchar('<');
  55         if (flags & IFF_UP && !(flags & IFF_RUNNING))
  56                 printf("NO-CARRIER,");
  57         flags &= ~IFF_RUNNING;
  58 #if 0
  59         _PF(ALLMULTI);
  60         _PF(PROMISC);
  61         _PF(MASTER);
  62         _PF(SLAVE);
  63         _PF(DEBUG);
  64         _PF(DYNAMIC);
  65         _PF(AUTOMEDIA);
  66         _PF(PORTSEL);
  67         _PF(NOTRAILERS);
  68 #endif
  69         flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
  70         if (flags)
  71                 printf("%x", flags);
  72         if (mdown)
  73                 printf(",M-DOWN");
  74         printf("> ");
  75 }
  76
  77 static void print_queuelen(char *name)
  78 {
  79         struct ifreq ifr;
  80         int s;
  81
  82         s = socket(AF_INET, SOCK_STREAM, 0);
  83         if (s < 0)
  84                 return;
  85
  86         memset(&ifr, 0, sizeof(ifr));
  87         strncpy_IFNAMSIZ(ifr.ifr_name, name);
  88         if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
  89                 close(s);
  90                 return;
  91         }
  92         close(s);
  93
  94         if (ifr.ifr_qlen)
  95                 printf("qlen %d", ifr.ifr_qlen);
  96 }
  97
  98 static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
  99 {
 100         struct ifinfomsg *ifi = NLMSG_DATA(n);
 101         struct rtattr *tb[IFLA_MAX+1];
 102         int len = n->nlmsg_len;
 103
 104         if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
 105                 return 0;
 106
 107         len -= NLMSG_LENGTH(sizeof(*ifi));
 108         if (len < 0)
 109                 return -1;
 110
 111         if (G_filter.ifindex && ifi->ifi_index != G_filter.ifindex)
 112                 return 0;
 113         if (G_filter.up && !(ifi->ifi_flags & IFF_UP))
 114                 return 0;
 115
 116         memset(tb, 0, sizeof(tb));
 117         parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
 118         if (tb[IFLA_IFNAME] == NULL) {
 119                 bb_error_msg("nil ifname");
 120                 return -1;
 121         }
 122         if (G_filter.label
 123          && (!G_filter.family || G_filter.family == AF_PACKET)
 124          && fnmatch(G_filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
 125         ) {
 126                 return 0;
 127         }
 128
 129         if (n->nlmsg_type == RTM_DELLINK)
 130                 printf("Deleted ");
 131
 132         printf("%d: %s", ifi->ifi_index,
 133                 /*tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>" - we checked tb[IFLA_IFNAME] above*/
 134                 (char*)RTA_DATA(tb[IFLA_IFNAME])
 135         );
 136
 137         {
 138                 unsigned m_flag = 0;
 139                 if (tb[IFLA_LINK]) {
 140                         SPRINT_BUF(b1);
 141                         int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
 142                         if (iflink == 0)
 143                                 printf("@NONE: ");
 144                         else {
 145                                 printf("@%s: ", ll_idx_n2a(iflink, b1));
 146                                 m_flag = ll_index_to_flags(iflink);
 147                                 m_flag = !(m_flag & IFF_UP);
 148                         }
 149                 } else {
 150                         printf(": ");
 151                 }
 152                 print_link_flags(ifi->ifi_flags, m_flag);
 153         }
 154
 155         if (tb[IFLA_MTU])
 156                 printf("mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
 157         if (tb[IFLA_QDISC])
 158                 printf("qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
 159 #ifdef IFLA_MASTER
 160         if (tb[IFLA_MASTER]) {
 161                 SPRINT_BUF(b1);
 162                 printf("master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
 163         }
 164 #endif
 165 /* IFLA_OPERSTATE was added to kernel with the same commit as IFF_DORMANT */
 166 #ifdef IFF_DORMANT
 167         if (tb[IFLA_OPERSTATE]) {
 168                 static const char operstate_labels[] ALIGN1 =
 169                         "UNKNOWN\0""NOTPRESENT\0""DOWN\0""LOWERLAYERDOWN\0"
 170                         "TESTING\0""DORMANT\0""UP\0";
 171                 printf("state %s ", nth_string(operstate_labels,
 172                                         *(uint8_t *)RTA_DATA(tb[IFLA_OPERSTATE])));
 173         }
 174 #endif
 175         if (G_filter.showqueue)
 176                 print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));
 177
 178         if (!G_filter.family || G_filter.family == AF_PACKET) {
 179                 SPRINT_BUF(b1);
 180                 printf("%c    link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1));
 181
 182                 if (tb[IFLA_ADDRESS]) {
 183                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
 184                                                       RTA_PAYLOAD(tb[IFLA_ADDRESS]),
 185                                                       ifi->ifi_type,
 186                                                       b1, sizeof(b1)), stdout);
 187                 }
 188                 if (tb[IFLA_BROADCAST]) {
 189                         if (ifi->ifi_flags & IFF_POINTOPOINT)
 190                                 printf(" peer ");
 191                         else
 192                                 printf(" brd ");
 193                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
 194                                                       RTA_PAYLOAD(tb[IFLA_BROADCAST]),
 195                                                       ifi->ifi_type,
 196                                                       b1, sizeof(b1)), stdout);
 197                 }
 198         }
 199         bb_putchar('\n');
 200         /*fflush_all();*/
 201         return 0;
 202 }
 203
 204 static int flush_update(void)
 205 {
 206         if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
 207                 bb_perror_msg("can't send flush request");
 208                 return -1;
 209         }
 210         G_filter.flushp = 0;
 211         return 0;
 212 }
 213
 214 static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
 215                 struct nlmsghdr *n, void *arg UNUSED_PARAM)
 216 {
 217         struct ifaddrmsg *ifa = NLMSG_DATA(n);
 218         int len = n->nlmsg_len;
 219         struct rtattr * rta_tb[IFA_MAX+1];
 220         char abuf[256];
 221         SPRINT_BUF(b1);
 222
 223         if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
 224                 return 0;
 225         len -= NLMSG_LENGTH(sizeof(*ifa));
 226         if (len < 0) {
 227                 bb_error_msg("wrong nlmsg len %d", len);
 228                 return -1;
 229         }
 230
 231         if (G_filter.flushb && n->nlmsg_type != RTM_NEWADDR)
 232                 return 0;
 233
 234         memset(rta_tb, 0, sizeof(rta_tb));
 235         parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
 236
 237         if (!rta_tb[IFA_LOCAL])
 238                 rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
 239         if (!rta_tb[IFA_ADDRESS])
 240                 rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
 241
 242         if (G_filter.ifindex && G_filter.ifindex != ifa->ifa_index)
 243                 return 0;
 244         if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 245                 return 0;
 246         if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 247                 return 0;
 248         if (G_filter.label) {
 249                 const char *label;
 250                 if (rta_tb[IFA_LABEL])
 251                         label = RTA_DATA(rta_tb[IFA_LABEL]);
 252                 else
 253                         label = ll_idx_n2a(ifa->ifa_index, b1);
 254                 if (fnmatch(G_filter.label, label, 0) != 0)
 255                         return 0;
 256         }
 257         if (G_filter.pfx.family) {
 258                 if (rta_tb[IFA_LOCAL]) {
 259                         inet_prefix dst;
 260                         memset(&dst, 0, sizeof(dst));
 261                         dst.family = ifa->ifa_family;
 262                         memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
 263                         if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
 264                                 return 0;
 265                 }
 266         }
 267
 268         if (G_filter.flushb) {
 269                 struct nlmsghdr *fn;
 270                 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
 271                         if (flush_update())
 272                                 return -1;
 273                 }
 274                 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
 275                 memcpy(fn, n, n->nlmsg_len);
 276                 fn->nlmsg_type = RTM_DELADDR;
 277                 fn->nlmsg_flags = NLM_F_REQUEST;
 278                 fn->nlmsg_seq = ++G_filter.rth->seq;
 279                 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
 280                 G_filter.flushed = 1;
 281                 return 0;
 282         }
 283
 284         if (n->nlmsg_type == RTM_DELADDR)
 285                 printf("Deleted ");
 286
 287         if (G_filter.oneline)
 288                 printf("%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
 289         if (ifa->ifa_family == AF_INET)
 290                 printf("    inet ");
 291         else if (ifa->ifa_family == AF_INET6)
 292                 printf("    inet6 ");
 293         else
 294                 printf("    family %d ", ifa->ifa_family);
 295
 296         if (rta_tb[IFA_LOCAL]) {
 297                 fputs(rt_addr_n2a(ifa->ifa_family,
 298                                               RTA_DATA(rta_tb[IFA_LOCAL]),
 299                                               abuf, sizeof(abuf)), stdout);
 300
 301                 if (rta_tb[IFA_ADDRESS] == NULL
 302                  || memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0
 303                 ) {
 304                         printf("/%d ", ifa->ifa_prefixlen);
 305                 } else {
 306                         printf(" peer %s/%d ",
 307                                 rt_addr_n2a(ifa->ifa_family,
 308                                             RTA_DATA(rta_tb[IFA_ADDRESS]),
 309                                             abuf, sizeof(abuf)),
 310                                 ifa->ifa_prefixlen);
 311                 }
 312         }
 313
 314         if (rta_tb[IFA_BROADCAST]) {
 315                 printf("brd %s ",
 316                         rt_addr_n2a(ifa->ifa_family,
 317                                         RTA_DATA(rta_tb[IFA_BROADCAST]),
 318                                         abuf, sizeof(abuf))
 319                 );
 320         }
 321         if (rta_tb[IFA_ANYCAST]) {
 322                 printf("any %s ",
 323                         rt_addr_n2a(ifa->ifa_family,
 324                                         RTA_DATA(rta_tb[IFA_ANYCAST]),
 325                                         abuf, sizeof(abuf))
 326                 );
 327         }
 328         printf("scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1));
 329         if (ifa->ifa_flags & IFA_F_SECONDARY) {
 330                 ifa->ifa_flags &= ~IFA_F_SECONDARY;
 331                 printf("secondary ");
 332         }
 333         if (ifa->ifa_flags & IFA_F_TENTATIVE) {
 334                 ifa->ifa_flags &= ~IFA_F_TENTATIVE;
 335                 printf("tentative ");
 336         }
 337         if (ifa->ifa_flags & IFA_F_DEPRECATED) {
 338                 ifa->ifa_flags &= ~IFA_F_DEPRECATED;
 339                 printf("deprecated ");
 340         }
 341         if (!(ifa->ifa_flags & IFA_F_PERMANENT)) {
 342                 printf("dynamic ");
 343         } else
 344                 ifa->ifa_flags &= ~IFA_F_PERMANENT;
 345         if (ifa->ifa_flags)
 346                 printf("flags %02x ", ifa->ifa_flags);
 347         if (rta_tb[IFA_LABEL])
 348                 fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), stdout);
 349         if (rta_tb[IFA_CACHEINFO]) {
 350                 struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
 351                 char buf[128];
 352                 bb_putchar(_SL_);
 353                 if (ci->ifa_valid == 0xFFFFFFFFU)
 354                         sprintf(buf, "valid_lft forever");
 355                 else
 356                         sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
 357                 if (ci->ifa_prefered == 0xFFFFFFFFU)
 358                         sprintf(buf+strlen(buf), " preferred_lft forever");
 359                 else
 360                         sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
 361                 printf("       %s", buf);
 362         }
 363         bb_putchar('\n');
 364         /*fflush_all();*/
 365         return 0;
 366 }
 367
 368
 369 struct nlmsg_list {
 370         struct nlmsg_list *next;
 371         struct nlmsghdr   h;
 372 };
 373
 374 static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo)
 375 {
 376         for (; ainfo; ainfo = ainfo->next) {
 377                 struct nlmsghdr *n = &ainfo->h;
 378                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 379
 380                 if (n->nlmsg_type != RTM_NEWADDR)
 381                         continue;
 382                 if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
 383                         return -1;
 384                 if (ifa->ifa_index != ifindex
 385                  || (G_filter.family && G_filter.family != ifa->ifa_family)
 386                 ) {
 387                         continue;
 388                 }
 389                 print_addrinfo(NULL, n, NULL);
 390         }
 391         return 0;
 392 }
 393
 394
 395 static int FAST_FUNC store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 396 {
 397         struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
 398         struct nlmsg_list *h;
 399         struct nlmsg_list **lp;
 400
 401         h = xzalloc(n->nlmsg_len + sizeof(void*));
 402
 403         memcpy(&h->h, n, n->nlmsg_len);
 404         /*h->next = NULL; - xzalloc did it */
 405
 406         for (lp = linfo; *lp; lp = &(*lp)->next)
 407                 continue;
 408         *lp = h;
 409
 410         ll_remember_index(who, n, NULL);
 411         return 0;
 412 }
 413
 414 static void ipaddr_reset_filter(int _oneline)
 415 {
 416         memset(&G_filter, 0, sizeof(G_filter));
 417         G_filter.oneline = _oneline;
 418 }
 419
 420 /* Return value becomes exitcode. It's okay to not return at all */
 421 int FAST_FUNC ipaddr_list_or_flush(char **argv, int flush)
 422 {
 423         static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";
 424
 425         struct nlmsg_list *linfo = NULL;
 426         struct nlmsg_list *ainfo = NULL;
 427         struct nlmsg_list *l;
 428         struct rtnl_handle rth;
 429         char *filter_dev = NULL;
 430         int no_link = 0;
 431
 432         ipaddr_reset_filter(oneline);
 433         G_filter.showqueue = 1;
 434
 435         if (G_filter.family == AF_UNSPEC)
 436                 G_filter.family = preferred_family;
 437
 438         if (flush) {
 439                 if (!*argv) {
 440                         bb_error_msg_and_die(bb_msg_requires_arg, "flush");
 441                 }
 442                 if (G_filter.family == AF_PACKET) {
 443                         bb_error_msg_and_die("can't flush link addresses");
 444                 }
 445         }
 446
 447         while (*argv) {
 448                 const smalluint key = index_in_strings(option, *argv);
 449                 if (key == 0) { /* to */
 450                         NEXT_ARG();
 451                         get_prefix(&G_filter.pfx, *argv, G_filter.family);
 452                         if (G_filter.family == AF_UNSPEC) {
 453                                 G_filter.family = G_filter.pfx.family;
 454                         }
 455                 } else if (key == 1) { /* scope */
 456                         uint32_t scope = 0;
 457                         NEXT_ARG();
 458                         G_filter.scopemask = -1;
 459                         if (rtnl_rtscope_a2n(&scope, *argv)) {
 460                                 if (strcmp(*argv, "all") != 0) {
 461                                         invarg(*argv, "scope");
 462                                 }
 463                                 scope = RT_SCOPE_NOWHERE;
 464                                 G_filter.scopemask = 0;
 465                         }
 466                         G_filter.scope = scope;
 467                 } else if (key == 2) { /* up */
 468                         G_filter.up = 1;
 469                 } else if (key == 3) { /* label */
 470                         NEXT_ARG();
 471                         G_filter.label = *argv;
 472                 } else {
 473                         if (key == 4) /* dev */
 474                                 NEXT_ARG();
 475                         if (filter_dev)
 476                                 duparg2("dev", *argv);
 477                         filter_dev = *argv;
 478                 }
 479                 argv++;
 480         }
 481
 482         xrtnl_open(&rth);
 483
 484         xrtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK);
 485         xrtnl_dump_filter(&rth, store_nlmsg, &linfo);
 486
 487         if (filter_dev) {
 488                 G_filter.ifindex = xll_name_to_index(filter_dev);
 489         }
 490
 491         if (flush) {
 492                 char flushb[4096-512];
 493
 494                 G_filter.flushb = flushb;
 495                 G_filter.flushp = 0;
 496                 G_filter.flushe = sizeof(flushb);
 497                 G_filter.rth = &rth;
 498
 499                 for (;;) {
 500                         xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETADDR);
 501                         G_filter.flushed = 0;
 502                         xrtnl_dump_filter(&rth, print_addrinfo, NULL);
 503                         if (G_filter.flushed == 0) {
 504                                 return 0;
 505                         }
 506                         if (flush_update() < 0) {
 507                                 return 1;
 508                         }
 509                 }
 510         }
 511
 512         if (G_filter.family != AF_PACKET) {
 513                 xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETADDR);
 514                 xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
 515         }
 516
 517
 518         if (G_filter.family && G_filter.family != AF_PACKET) {
 519                 struct nlmsg_list **lp;
 520                 lp = &linfo;
 521
 522                 if (G_filter.oneline)
 523                         no_link = 1;
 524
 525                 while ((l = *lp) != NULL) {
 526                         int ok = 0;
 527                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 528                         struct nlmsg_list *a;
 529
 530                         for (a = ainfo; a; a = a->next) {
 531                                 struct nlmsghdr *n = &a->h;
 532                                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 533
 534                                 if (ifa->ifa_index != ifi->ifi_index
 535                                  || (G_filter.family && G_filter.family != ifa->ifa_family)
 536                                 ) {
 537                                         continue;
 538                                 }
 539                                 if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 540                                         continue;
 541                                 if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 542                                         continue;
 543                                 if (G_filter.pfx.family || G_filter.label) {
 544                                         struct rtattr *tb[IFA_MAX+1];
 545                                         memset(tb, 0, sizeof(tb));
 546                                         parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
 547                                         if (!tb[IFA_LOCAL])
 548                                                 tb[IFA_LOCAL] = tb[IFA_ADDRESS];
 549
 550                                         if (G_filter.pfx.family && tb[IFA_LOCAL]) {
 551                                                 inet_prefix dst;
 552                                                 memset(&dst, 0, sizeof(dst));
 553                                                 dst.family = ifa->ifa_family;
 554                                                 memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL]));
 555                                                 if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
 556                                                         continue;
 557                                         }
 558                                         if (G_filter.label) {
 559                                                 SPRINT_BUF(b1);
 560                                                 const char *label;
 561                                                 if (tb[IFA_LABEL])
 562                                                         label = RTA_DATA(tb[IFA_LABEL]);
 563                                                 else
 564                                                         label = ll_idx_n2a(ifa->ifa_index, b1);
 565                                                 if (fnmatch(G_filter.label, label, 0) != 0)
 566                                                         continue;
 567                                         }
 568                                 }
 569
 570                                 ok = 1;
 571                                 break;
 572                         }
 573                         if (!ok)
 574                                 *lp = l->next;
 575                         else
 576                                 lp = &l->next;
 577                 }
 578         }
 579
 580         for (l = linfo; l; l = l->next) {
 581                 if (no_link || print_linkinfo(&l->h) == 0) {
 582                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 583                         if (G_filter.family != AF_PACKET)
 584                                 print_selected_addrinfo(ifi->ifi_index, ainfo);
 585                 }
 586         }
 587
 588         return 0;
 589 }
 590
 591 static int default_scope(inet_prefix *lcl)
 592 {
 593         if (lcl->family == AF_INET) {
 594                 if (lcl->bytelen >= 1 && *(uint8_t*)&lcl->data == 127)
 595                         return RT_SCOPE_HOST;
 596         }
 597         return 0;
 598 }
 599
 600 /* Return value becomes exitcode. It's okay to not return at all */
 601 static int ipaddr_modify(int cmd, char **argv)
 602 {
 603         static const char option[] ALIGN1 =
 604                 "peer\0""remote\0""broadcast\0""brd\0"
 605                 "anycast\0""scope\0""dev\0""label\0""local\0";
 606         struct rtnl_handle rth;
 607         struct {
 608                 struct nlmsghdr  n;
 609                 struct ifaddrmsg ifa;
 610                 char             buf[256];
 611         } req;
 612         char *d = NULL;
 613         char *l = NULL;
 614         inet_prefix lcl;
 615         inet_prefix peer;
 616         int local_len = 0;
 617         int peer_len = 0;
 618         int brd_len = 0;
 619         int any_len = 0;
 620         bool scoped = 0;
 621
 622         memset(&req, 0, sizeof(req));
 623
 624         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
 625         req.n.nlmsg_flags = NLM_F_REQUEST;
 626         req.n.nlmsg_type = cmd;
 627         req.ifa.ifa_family = preferred_family;
 628
 629         while (*argv) {
 630                 unsigned arg = index_in_strings(option, *argv);
 631                 /* if search fails, "local" is assumed */
 632                 if ((int)arg >= 0)
 633                         NEXT_ARG();
 634
 635                 if (arg <= 1) { /* peer, remote */
 636                         if (peer_len) {
 637                                 duparg("peer", *argv);
 638                         }
 639                         get_prefix(&peer, *argv, req.ifa.ifa_family);
 640                         peer_len = peer.bytelen;
 641                         if (req.ifa.ifa_family == AF_UNSPEC) {
 642                                 req.ifa.ifa_family = peer.family;
 643                         }
 644                         addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
 645                         req.ifa.ifa_prefixlen = peer.bitlen;
 646                 } else if (arg <= 3) { /* broadcast, brd */
 647                         inet_prefix addr;
 648                         if (brd_len) {
 649                                 duparg("broadcast", *argv);
 650                         }
 651                         if (LONE_CHAR(*argv, '+')) {
 652                                 brd_len = -1;
 653                         } else if (LONE_DASH(*argv)) {
 654                                 brd_len = -2;
 655                         } else {
 656                                 get_addr(&addr, *argv, req.ifa.ifa_family);
 657                                 if (req.ifa.ifa_family == AF_UNSPEC)
 658                                         req.ifa.ifa_family = addr.family;
 659                                 addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
 660                                 brd_len = addr.bytelen;
 661                         }
 662                 } else if (arg == 4) { /* anycast */
 663                         inet_prefix addr;
 664                         if (any_len) {
 665                                 duparg("anycast", *argv);
 666                         }
 667                         get_addr(&addr, *argv, req.ifa.ifa_family);
 668                         if (req.ifa.ifa_family == AF_UNSPEC) {
 669                                 req.ifa.ifa_family = addr.family;
 670                         }
 671                         addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
 672                         any_len = addr.bytelen;
 673                 } else if (arg == 5) { /* scope */
 674                         uint32_t scope = 0;
 675                         if (rtnl_rtscope_a2n(&scope, *argv)) {
 676                                 invarg(*argv, "scope");
 677                         }
 678                         req.ifa.ifa_scope = scope;
 679                         scoped = 1;
 680                 } else if (arg == 6) { /* dev */
 681                         d = *argv;
 682                 } else if (arg == 7) { /* label */
 683                         l = *argv;
 684                         addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l) + 1);
 685                 } else {
 686                         /* local (specified or assumed) */
 687                         if (local_len) {
 688                                 duparg2("local", *argv);
 689                         }
 690                         get_prefix(&lcl, *argv, req.ifa.ifa_family);
 691                         if (req.ifa.ifa_family == AF_UNSPEC) {
 692                                 req.ifa.ifa_family = lcl.family;
 693                         }
 694                         addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
 695                         local_len = lcl.bytelen;
 696                 }
 697                 argv++;
 698         }
 699
 700         if (!d) {
 701                 /* There was no "dev IFACE", but we need that */
 702                 bb_error_msg_and_die("need \"dev IFACE\"");
 703         }
 704         if (l && strncmp(d, l, strlen(d)) != 0) {
 705                 bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
 706         }
 707
 708         if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
 709                 peer = lcl;
 710                 addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
 711         }
 712         if (req.ifa.ifa_prefixlen == 0)
 713                 req.ifa.ifa_prefixlen = lcl.bitlen;
 714
 715         if (brd_len < 0 && cmd != RTM_DELADDR) {
 716                 inet_prefix brd;
 717                 int i;
 718                 if (req.ifa.ifa_family != AF_INET) {
 719                         bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
 720                 }
 721                 brd = peer;
 722                 if (brd.bitlen <= 30) {
 723                         for (i = 31; i >= brd.bitlen; i--) {
 724                                 if (brd_len == -1)
 725                                         brd.data[0] |= htonl(1<<(31-i));
 726                                 else
 727                                         brd.data[0] &= ~htonl(1<<(31-i));
 728                         }
 729                         addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
 730                         brd_len = brd.bytelen;
 731                 }
 732         }
 733         if (!scoped && cmd != RTM_DELADDR)
 734                 req.ifa.ifa_scope = default_scope(&lcl);
 735
 736         xrtnl_open(&rth);
 737
 738         ll_init_map(&rth);
 739
 740         req.ifa.ifa_index = xll_name_to_index(d);
 741
 742         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 743                 return 2;
 744
 745         return 0;
 746 }
 747
 748 /* Return value becomes exitcode. It's okay to not return at all */
 749 int FAST_FUNC do_ipaddr(char **argv)
 750 {
 751         static const char commands[] ALIGN1 =
 752                 "add\0""delete\0""list\0""show\0""lst\0""flush\0";
 753         int cmd = 2;
 754         if (*argv) {
 755                 cmd = index_in_substrings(commands, *argv);
 756                 if (cmd < 0)
 757                         invarg(*argv, applet_name);
 758                 argv++;
 759                 if (cmd <= 1)
 760                         return ipaddr_modify((cmd == 0) ? RTM_NEWADDR : RTM_DELADDR, argv);
 761         }
 762         /* 2 == list, 3 == show, 4 == lst */
 763         return ipaddr_list_or_flush(argv, cmd == 5);
 764 }