networking/libiproute/ipaddress.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * ipaddress.c          "ip address".
   4  *
   5  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   6  *
   7  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   8  *
   9  * Changes:
  10  *      Laszlo Valko <valko@linux.karinthy.hu> 990223: address label must be zero terminated
  11  */
  12
  13 #include <fnmatch.h>
  14 #include <net/if.h>
  15 #include <net/if_arp.h>
  16
  17 #include "ip_common.h"  /* #include "libbb.h" is inside */
  18 #include "rt_names.h"
  19 #include "utils.h"
  20
  21 #ifndef IFF_LOWER_UP
  22 /* from linux/if.h */
  23 #define IFF_LOWER_UP    0x10000         /* driver signals L1 up*/
  24 #endif
  25
  26 struct filter_t {
  27         char *label;
  28         char *flushb;
  29         struct rtnl_handle *rth;
  30         int scope, scopemask;
  31         int flags, flagmask;
  32         int flushp;
  33         int flushe;
  34         int ifindex;
  35         family_t family;
  36         smallint showqueue;
  37         smallint oneline;
  38         smallint up;
  39         smallint flushed;
  40         inet_prefix pfx;
  41 } FIX_ALIASING;
  42 typedef struct filter_t filter_t;
  43
  44 #define G_filter (*(filter_t*)&bb_common_bufsiz1)
  45
  46
  47 static void print_link_flags(unsigned flags, unsigned mdown)
  48 {
  49         static const int flag_masks[] = {
  50                 IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
  51                 IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
  52         static const char flag_labels[] ALIGN1 =
  53                 "LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
  54                 "MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";
  55
  56         bb_putchar('<');
  57         if (flags & IFF_UP && !(flags & IFF_RUNNING))
  58                 printf("NO-CARRIER,");
  59         flags &= ~IFF_RUNNING;
  60 #if 0
  61         _PF(ALLMULTI);
  62         _PF(PROMISC);
  63         _PF(MASTER);
  64         _PF(SLAVE);
  65         _PF(DEBUG);
  66         _PF(DYNAMIC);
  67         _PF(AUTOMEDIA);
  68         _PF(PORTSEL);
  69         _PF(NOTRAILERS);
  70 #endif
  71         flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
  72         if (flags)
  73                 printf("%x", flags);
  74         if (mdown)
  75                 printf(",M-DOWN");
  76         printf("> ");
  77 }
  78
  79 static void print_queuelen(char *name)
  80 {
  81         struct ifreq ifr;
  82         int s;
  83
  84         s = socket(AF_INET, SOCK_STREAM, 0);
  85         if (s < 0)
  86                 return;
  87
  88         memset(&ifr, 0, sizeof(ifr));
  89         strncpy_IFNAMSIZ(ifr.ifr_name, name);
  90         if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
  91                 close(s);
  92                 return;
  93         }
  94         close(s);
  95
  96         if (ifr.ifr_qlen)
  97                 printf("qlen %d", ifr.ifr_qlen);
  98 }
  99
 100 static NOINLINE int print_linkinfo(const struct nlmsghdr *n)
 101 {
 102         struct ifinfomsg *ifi = NLMSG_DATA(n);
 103         struct rtattr *tb[IFLA_MAX+1];
 104         int len = n->nlmsg_len;
 105
 106         if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
 107                 return 0;
 108
 109         len -= NLMSG_LENGTH(sizeof(*ifi));
 110         if (len < 0)
 111                 return -1;
 112
 113         if (G_filter.ifindex && ifi->ifi_index != G_filter.ifindex)
 114                 return 0;
 115         if (G_filter.up && !(ifi->ifi_flags & IFF_UP))
 116                 return 0;
 117
 118         memset(tb, 0, sizeof(tb));
 119         parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
 120         if (tb[IFLA_IFNAME] == NULL) {
 121                 bb_error_msg("nil ifname");
 122                 return -1;
 123         }
 124         if (G_filter.label
 125          && (!G_filter.family || G_filter.family == AF_PACKET)
 126          && fnmatch(G_filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
 127         ) {
 128                 return 0;
 129         }
 130
 131         if (n->nlmsg_type == RTM_DELLINK)
 132                 printf("Deleted ");
 133
 134         printf("%d: %s", ifi->ifi_index,
 135                 /*tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>" - we checked tb[IFLA_IFNAME] above*/
 136                 (char*)RTA_DATA(tb[IFLA_IFNAME])
 137         );
 138
 139         {
 140                 unsigned m_flag = 0;
 141                 if (tb[IFLA_LINK]) {
 142                         SPRINT_BUF(b1);
 143                         int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
 144                         if (iflink == 0)
 145                                 printf("@NONE: ");
 146                         else {
 147                                 printf("@%s: ", ll_idx_n2a(iflink, b1));
 148                                 m_flag = ll_index_to_flags(iflink);
 149                                 m_flag = !(m_flag & IFF_UP);
 150                         }
 151                 } else {
 152                         printf(": ");
 153                 }
 154                 print_link_flags(ifi->ifi_flags, m_flag);
 155         }
 156
 157         if (tb[IFLA_MTU])
 158                 printf("mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
 159         if (tb[IFLA_QDISC])
 160                 printf("qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
 161 #ifdef IFLA_MASTER
 162         if (tb[IFLA_MASTER]) {
 163                 SPRINT_BUF(b1);
 164                 printf("master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
 165         }
 166 #endif
 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         if (G_filter.showqueue)
 175                 print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));
 176
 177         if (!G_filter.family || G_filter.family == AF_PACKET) {
 178                 SPRINT_BUF(b1);
 179                 printf("%c    link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1));
 180
 181                 if (tb[IFLA_ADDRESS]) {
 182                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
 183                                                       RTA_PAYLOAD(tb[IFLA_ADDRESS]),
 184                                                       ifi->ifi_type,
 185                                                       b1, sizeof(b1)), stdout);
 186                 }
 187                 if (tb[IFLA_BROADCAST]) {
 188                         if (ifi->ifi_flags & IFF_POINTOPOINT)
 189                                 printf(" peer ");
 190                         else
 191                                 printf(" brd ");
 192                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
 193                                                       RTA_PAYLOAD(tb[IFLA_BROADCAST]),
 194                                                       ifi->ifi_type,
 195                                                       b1, sizeof(b1)), stdout);
 196                 }
 197         }
 198         bb_putchar('\n');
 199         /*fflush_all();*/
 200         return 0;
 201 }
 202
 203 static int flush_update(void)
 204 {
 205         if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
 206                 bb_perror_msg("can't send flush request");
 207                 return -1;
 208         }
 209         G_filter.flushp = 0;
 210         return 0;
 211 }
 212
 213 static int FAST_FUNC print_addrinfo(const struct sockaddr_nl *who UNUSED_PARAM,
 214                 struct nlmsghdr *n, void *arg UNUSED_PARAM)
 215 {
 216         struct ifaddrmsg *ifa = NLMSG_DATA(n);
 217         int len = n->nlmsg_len;
 218         struct rtattr * rta_tb[IFA_MAX+1];
 219         char abuf[256];
 220         SPRINT_BUF(b1);
 221
 222         if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
 223                 return 0;
 224         len -= NLMSG_LENGTH(sizeof(*ifa));
 225         if (len < 0) {
 226                 bb_error_msg("wrong nlmsg len %d", len);
 227                 return -1;
 228         }
 229
 230         if (G_filter.flushb && n->nlmsg_type != RTM_NEWADDR)
 231                 return 0;
 232
 233         memset(rta_tb, 0, sizeof(rta_tb));
 234         parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
 235
 236         if (!rta_tb[IFA_LOCAL])
 237                 rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
 238         if (!rta_tb[IFA_ADDRESS])
 239                 rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
 240
 241         if (G_filter.ifindex && G_filter.ifindex != ifa->ifa_index)
 242                 return 0;
 243         if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 244                 return 0;
 245         if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 246                 return 0;
 247         if (G_filter.label) {
 248                 const char *label;
 249                 if (rta_tb[IFA_LABEL])
 250                         label = RTA_DATA(rta_tb[IFA_LABEL]);
 251                 else
 252                         label = ll_idx_n2a(ifa->ifa_index, b1);
 253                 if (fnmatch(G_filter.label, label, 0) != 0)
 254                         return 0;
 255         }
 256         if (G_filter.pfx.family) {
 257                 if (rta_tb[IFA_LOCAL]) {
 258                         inet_prefix dst;
 259                         memset(&dst, 0, sizeof(dst));
 260                         dst.family = ifa->ifa_family;
 261                         memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
 262                         if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
 263                                 return 0;
 264                 }
 265         }
 266
 267         if (G_filter.flushb) {
 268                 struct nlmsghdr *fn;
 269                 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
 270                         if (flush_update())
 271                                 return -1;
 272                 }
 273                 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
 274                 memcpy(fn, n, n->nlmsg_len);
 275                 fn->nlmsg_type = RTM_DELADDR;
 276                 fn->nlmsg_flags = NLM_F_REQUEST;
 277                 fn->nlmsg_seq = ++G_filter.rth->seq;
 278                 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
 279                 G_filter.flushed = 1;
 280                 return 0;
 281         }
 282
 283         if (n->nlmsg_type == RTM_DELADDR)
 284                 printf("Deleted ");
 285
 286         if (G_filter.oneline)
 287                 printf("%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
 288         if (ifa->ifa_family == AF_INET)
 289                 printf("    inet ");
 290         else if (ifa->ifa_family == AF_INET6)
 291                 printf("    inet6 ");
 292         else
 293                 printf("    family %d ", ifa->ifa_family);
 294
 295         if (rta_tb[IFA_LOCAL]) {
 296                 fputs(rt_addr_n2a(ifa->ifa_family,
 297                                               RTA_DATA(rta_tb[IFA_LOCAL]),
 298                                               abuf, sizeof(abuf)), stdout);
 299
 300                 if (rta_tb[IFA_ADDRESS] == NULL
 301                  || memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0
 302                 ) {
 303                         printf("/%d ", ifa->ifa_prefixlen);
 304                 } else {
 305                         printf(" peer %s/%d ",
 306                                 rt_addr_n2a(ifa->ifa_family,
 307                                             RTA_DATA(rta_tb[IFA_ADDRESS]),
 308                                             abuf, sizeof(abuf)),
 309                                 ifa->ifa_prefixlen);
 310                 }
 311         }
 312
 313         if (rta_tb[IFA_BROADCAST]) {
 314                 printf("brd %s ",
 315                         rt_addr_n2a(ifa->ifa_family,
 316                                     RTA_DATA(rta_tb[IFA_BROADCAST]),
 317                                     abuf, sizeof(abuf)));
 318         }
 319         if (rta_tb[IFA_ANYCAST]) {
 320                 printf("any %s ",
 321                         rt_addr_n2a(ifa->ifa_family,
 322                                     RTA_DATA(rta_tb[IFA_ANYCAST]),
 323                                     abuf, sizeof(abuf)));
 324         }
 325         printf("scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1));
 326         if (ifa->ifa_flags & IFA_F_SECONDARY) {
 327                 ifa->ifa_flags &= ~IFA_F_SECONDARY;
 328                 printf("secondary ");
 329         }
 330         if (ifa->ifa_flags & IFA_F_TENTATIVE) {
 331                 ifa->ifa_flags &= ~IFA_F_TENTATIVE;
 332                 printf("tentative ");
 333         }
 334         if (ifa->ifa_flags & IFA_F_DEPRECATED) {
 335                 ifa->ifa_flags &= ~IFA_F_DEPRECATED;
 336                 printf("deprecated ");
 337         }
 338         if (!(ifa->ifa_flags & IFA_F_PERMANENT)) {
 339                 printf("dynamic ");
 340         } else
 341                 ifa->ifa_flags &= ~IFA_F_PERMANENT;
 342         if (ifa->ifa_flags)
 343                 printf("flags %02x ", ifa->ifa_flags);
 344         if (rta_tb[IFA_LABEL])
 345                 fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), stdout);
 346         if (rta_tb[IFA_CACHEINFO]) {
 347                 struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
 348                 char buf[128];
 349                 bb_putchar(_SL_);
 350                 if (ci->ifa_valid == 0xFFFFFFFFU)
 351                         sprintf(buf, "valid_lft forever");
 352                 else
 353                         sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
 354                 if (ci->ifa_prefered == 0xFFFFFFFFU)
 355                         sprintf(buf+strlen(buf), " preferred_lft forever");
 356                 else
 357                         sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
 358                 printf("       %s", buf);
 359         }
 360         bb_putchar('\n');
 361         /*fflush_all();*/
 362         return 0;
 363 }
 364
 365
 366 struct nlmsg_list {
 367         struct nlmsg_list *next;
 368         struct nlmsghdr   h;
 369 };
 370
 371 static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo)
 372 {
 373         for (; ainfo; ainfo = ainfo->next) {
 374                 struct nlmsghdr *n = &ainfo->h;
 375                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 376
 377                 if (n->nlmsg_type != RTM_NEWADDR)
 378                         continue;
 379                 if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
 380                         return -1;
 381                 if (ifa->ifa_index != ifindex
 382                  || (G_filter.family && G_filter.family != ifa->ifa_family)
 383                 ) {
 384                         continue;
 385                 }
 386                 print_addrinfo(NULL, n, NULL);
 387         }
 388         return 0;
 389 }
 390
 391
 392 static int FAST_FUNC store_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 393 {
 394         struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
 395         struct nlmsg_list *h;
 396         struct nlmsg_list **lp;
 397
 398         h = xzalloc(n->nlmsg_len + sizeof(void*));
 399
 400         memcpy(&h->h, n, n->nlmsg_len);
 401         /*h->next = NULL; - xzalloc did it */
 402
 403         for (lp = linfo; *lp; lp = &(*lp)->next)
 404                 continue;
 405         *lp = h;
 406
 407         ll_remember_index(who, n, NULL);
 408         return 0;
 409 }
 410
 411 static void ipaddr_reset_filter(int _oneline)
 412 {
 413         memset(&G_filter, 0, sizeof(G_filter));
 414         G_filter.oneline = _oneline;
 415 }
 416
 417 /* Return value becomes exitcode. It's okay to not return at all */
 418 int FAST_FUNC ipaddr_list_or_flush(char **argv, int flush)
 419 {
 420         static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";
 421
 422         struct nlmsg_list *linfo = NULL;
 423         struct nlmsg_list *ainfo = NULL;
 424         struct nlmsg_list *l;
 425         struct rtnl_handle rth;
 426         char *filter_dev = NULL;
 427         int no_link = 0;
 428
 429         ipaddr_reset_filter(oneline);
 430         G_filter.showqueue = 1;
 431
 432         if (G_filter.family == AF_UNSPEC)
 433                 G_filter.family = preferred_family;
 434
 435         if (flush) {
 436                 if (!*argv) {
 437                         bb_error_msg_and_die(bb_msg_requires_arg, "flush");
 438                 }
 439                 if (G_filter.family == AF_PACKET) {
 440                         bb_error_msg_and_die("can't flush link addresses");
 441                 }
 442         }
 443
 444         while (*argv) {
 445                 const smalluint key = index_in_strings(option, *argv);
 446                 if (key == 0) { /* to */
 447                         NEXT_ARG();
 448                         get_prefix(&G_filter.pfx, *argv, G_filter.family);
 449                         if (G_filter.family == AF_UNSPEC) {
 450                                 G_filter.family = G_filter.pfx.family;
 451                         }
 452                 } else if (key == 1) { /* scope */
 453                         uint32_t scope = 0;
 454                         NEXT_ARG();
 455                         G_filter.scopemask = -1;
 456                         if (rtnl_rtscope_a2n(&scope, *argv)) {
 457                                 if (strcmp(*argv, "all") != 0) {
 458                                         invarg(*argv, "scope");
 459                                 }
 460                                 scope = RT_SCOPE_NOWHERE;
 461                                 G_filter.scopemask = 0;
 462                         }
 463                         G_filter.scope = scope;
 464                 } else if (key == 2) { /* up */
 465                         G_filter.up = 1;
 466                 } else if (key == 3) { /* label */
 467                         NEXT_ARG();
 468                         G_filter.label = *argv;
 469                 } else {
 470                         if (key == 4) /* dev */
 471                                 NEXT_ARG();
 472                         if (filter_dev)
 473                                 duparg2("dev", *argv);
 474                         filter_dev = *argv;
 475                 }
 476                 argv++;
 477         }
 478
 479         xrtnl_open(&rth);
 480
 481         xrtnl_wilddump_request(&rth, preferred_family, RTM_GETLINK);
 482         xrtnl_dump_filter(&rth, store_nlmsg, &linfo);
 483
 484         if (filter_dev) {
 485                 G_filter.ifindex = xll_name_to_index(filter_dev);
 486         }
 487
 488         if (flush) {
 489                 char flushb[4096-512];
 490
 491                 G_filter.flushb = flushb;
 492                 G_filter.flushp = 0;
 493                 G_filter.flushe = sizeof(flushb);
 494                 G_filter.rth = &rth;
 495
 496                 for (;;) {
 497                         xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETADDR);
 498                         G_filter.flushed = 0;
 499                         xrtnl_dump_filter(&rth, print_addrinfo, NULL);
 500                         if (G_filter.flushed == 0) {
 501                                 return 0;
 502                         }
 503                         if (flush_update() < 0) {
 504                                 return 1;
 505                         }
 506                 }
 507         }
 508
 509         if (G_filter.family != AF_PACKET) {
 510                 xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETADDR);
 511                 xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
 512         }
 513
 514
 515         if (G_filter.family && G_filter.family != AF_PACKET) {
 516                 struct nlmsg_list **lp;
 517                 lp = &linfo;
 518
 519                 if (G_filter.oneline)
 520                         no_link = 1;
 521
 522                 while ((l = *lp) != NULL) {
 523                         int ok = 0;
 524                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 525                         struct nlmsg_list *a;
 526
 527                         for (a = ainfo; a; a = a->next) {
 528                                 struct nlmsghdr *n = &a->h;
 529                                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 530
 531                                 if (ifa->ifa_index != ifi->ifi_index
 532                                  || (G_filter.family && G_filter.family != ifa->ifa_family)
 533                                 ) {
 534                                         continue;
 535                                 }
 536                                 if ((G_filter.scope ^ ifa->ifa_scope) & G_filter.scopemask)
 537                                         continue;
 538                                 if ((G_filter.flags ^ ifa->ifa_flags) & G_filter.flagmask)
 539                                         continue;
 540                                 if (G_filter.pfx.family || G_filter.label) {
 541                                         struct rtattr *tb[IFA_MAX+1];
 542                                         memset(tb, 0, sizeof(tb));
 543                                         parse_rtattr(tb, IFA_MAX, IFA_RTA(ifa), IFA_PAYLOAD(n));
 544                                         if (!tb[IFA_LOCAL])
 545                                                 tb[IFA_LOCAL] = tb[IFA_ADDRESS];
 546
 547                                         if (G_filter.pfx.family && tb[IFA_LOCAL]) {
 548                                                 inet_prefix dst;
 549                                                 memset(&dst, 0, sizeof(dst));
 550                                                 dst.family = ifa->ifa_family;
 551                                                 memcpy(&dst.data, RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_LOCAL]));
 552                                                 if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
 553                                                         continue;
 554                                         }
 555                                         if (G_filter.label) {
 556                                                 SPRINT_BUF(b1);
 557                                                 const char *label;
 558                                                 if (tb[IFA_LABEL])
 559                                                         label = RTA_DATA(tb[IFA_LABEL]);
 560                                                 else
 561                                                         label = ll_idx_n2a(ifa->ifa_index, b1);
 562                                                 if (fnmatch(G_filter.label, label, 0) != 0)
 563                                                         continue;
 564                                         }
 565                                 }
 566
 567                                 ok = 1;
 568                                 break;
 569                         }
 570                         if (!ok)
 571                                 *lp = l->next;
 572                         else
 573                                 lp = &l->next;
 574                 }
 575         }
 576
 577         for (l = linfo; l; l = l->next) {
 578                 if (no_link || print_linkinfo(&l->h) == 0) {
 579                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 580                         if (G_filter.family != AF_PACKET)
 581                                 print_selected_addrinfo(ifi->ifi_index, ainfo);
 582                 }
 583         }
 584
 585         return 0;
 586 }
 587
 588 static int default_scope(inet_prefix *lcl)
 589 {
 590         if (lcl->family == AF_INET) {
 591                 if (lcl->bytelen >= 1 && *(uint8_t*)&lcl->data == 127)
 592                         return RT_SCOPE_HOST;
 593         }
 594         return 0;
 595 }
 596
 597 /* Return value becomes exitcode. It's okay to not return at all */
 598 static int ipaddr_modify(int cmd, char **argv)
 599 {
 600         static const char option[] ALIGN1 =
 601                 "peer\0""remote\0""broadcast\0""brd\0"
 602                 "anycast\0""scope\0""dev\0""label\0""local\0";
 603         struct rtnl_handle rth;
 604         struct {
 605                 struct nlmsghdr  n;
 606                 struct ifaddrmsg ifa;
 607                 char             buf[256];
 608         } req;
 609         char *d = NULL;
 610         char *l = NULL;
 611         inet_prefix lcl;
 612         inet_prefix peer;
 613         int local_len = 0;
 614         int peer_len = 0;
 615         int brd_len = 0;
 616         int any_len = 0;
 617         bool scoped = 0;
 618
 619         memset(&req, 0, sizeof(req));
 620
 621         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg));
 622         req.n.nlmsg_flags = NLM_F_REQUEST;
 623         req.n.nlmsg_type = cmd;
 624         req.ifa.ifa_family = preferred_family;
 625
 626         while (*argv) {
 627                 const smalluint arg = index_in_strings(option, *argv);
 628                 if (arg <= 1) { /* peer, remote */
 629                         NEXT_ARG();
 630
 631                         if (peer_len) {
 632                                 duparg("peer", *argv);
 633                         }
 634                         get_prefix(&peer, *argv, req.ifa.ifa_family);
 635                         peer_len = peer.bytelen;
 636                         if (req.ifa.ifa_family == AF_UNSPEC) {
 637                                 req.ifa.ifa_family = peer.family;
 638                         }
 639                         addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
 640                         req.ifa.ifa_prefixlen = peer.bitlen;
 641                 } else if (arg <= 3) { /* broadcast, brd */
 642                         inet_prefix addr;
 643                         NEXT_ARG();
 644                         if (brd_len) {
 645                                 duparg("broadcast", *argv);
 646                         }
 647                         if (LONE_CHAR(*argv, '+')) {
 648                                 brd_len = -1;
 649                         } else if (LONE_DASH(*argv)) {
 650                                 brd_len = -2;
 651                         } else {
 652                                 get_addr(&addr, *argv, req.ifa.ifa_family);
 653                                 if (req.ifa.ifa_family == AF_UNSPEC)
 654                                         req.ifa.ifa_family = addr.family;
 655                                 addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
 656                                 brd_len = addr.bytelen;
 657                         }
 658                 } else if (arg == 4) { /* anycast */
 659                         inet_prefix addr;
 660                         NEXT_ARG();
 661                         if (any_len) {
 662                                 duparg("anycast", *argv);
 663                         }
 664                         get_addr(&addr, *argv, req.ifa.ifa_family);
 665                         if (req.ifa.ifa_family == AF_UNSPEC) {
 666                                 req.ifa.ifa_family = addr.family;
 667                         }
 668                         addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
 669                         any_len = addr.bytelen;
 670                 } else if (arg == 5) { /* scope */
 671                         uint32_t scope = 0;
 672                         NEXT_ARG();
 673                         if (rtnl_rtscope_a2n(&scope, *argv)) {
 674                                 invarg(*argv, "scope");
 675                         }
 676                         req.ifa.ifa_scope = scope;
 677                         scoped = 1;
 678                 } else if (arg == 6) { /* dev */
 679                         NEXT_ARG();
 680                         d = *argv;
 681                 } else if (arg == 7) { /* label */
 682                         NEXT_ARG();
 683                         l = *argv;
 684                         addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l) + 1);
 685                 } else {
 686                         if (arg == 8) /* local */
 687                                 NEXT_ARG();
 688                         if (local_len) {
 689                                 duparg2("local", *argv);
 690                         }
 691                         get_prefix(&lcl, *argv, req.ifa.ifa_family);
 692                         if (req.ifa.ifa_family == AF_UNSPEC) {
 693                                 req.ifa.ifa_family = lcl.family;
 694                         }
 695                         addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
 696                         local_len = lcl.bytelen;
 697                 }
 698                 argv++;
 699         }
 700
 701         if (!d) {
 702                 /* There was no "dev IFACE", but we need that */
 703                 bb_error_msg_and_die("need \"dev IFACE\"");
 704         }
 705         if (l && strncmp(d, l, strlen(d)) != 0) {
 706                 bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
 707         }
 708
 709         if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
 710                 peer = lcl;
 711                 addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
 712         }
 713         if (req.ifa.ifa_prefixlen == 0)
 714                 req.ifa.ifa_prefixlen = lcl.bitlen;
 715
 716         if (brd_len < 0 && cmd != RTM_DELADDR) {
 717                 inet_prefix brd;
 718                 int i;
 719                 if (req.ifa.ifa_family != AF_INET) {
 720                         bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
 721                 }
 722                 brd = peer;
 723                 if (brd.bitlen <= 30) {
 724                         for (i=31; i>=brd.bitlen; i--) {
 725                                 if (brd_len == -1)
 726                                         brd.data[0] |= htonl(1<<(31-i));
 727                                 else
 728                                         brd.data[0] &= ~htonl(1<<(31-i));
 729                         }
 730                         addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
 731                         brd_len = brd.bytelen;
 732                 }
 733         }
 734         if (!scoped && cmd != RTM_DELADDR)
 735                 req.ifa.ifa_scope = default_scope(&lcl);
 736
 737         xrtnl_open(&rth);
 738
 739         ll_init_map(&rth);
 740
 741         req.ifa.ifa_index = xll_name_to_index(d);
 742
 743         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 744                 return 2;
 745
 746         return 0;
 747 }
 748
 749 /* Return value becomes exitcode. It's okay to not return at all */
 750 int FAST_FUNC do_ipaddr(char **argv)
 751 {
 752         static const char commands[] ALIGN1 =
 753                 "add\0""delete\0""list\0""show\0""lst\0""flush\0";
 754         smalluint cmd = 2;
 755         if (*argv) {
 756                 cmd = index_in_substrings(commands, *argv);
 757                 if (cmd > 5)
 758                         bb_error_msg_and_die(bb_msg_invalid_arg, *argv, applet_name);
 759                 argv++;
 760                 if (cmd <= 1)
 761                         return ipaddr_modify((cmd == 0) ? RTM_NEWADDR : RTM_DELADDR, argv);
 762         }
 763         /* 2 == list, 3 == show, 4 == lst */
 764         return ipaddr_list_or_flush(argv, cmd == 5);
 765 }