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 <sys/socket.h>
  14 //#include <sys/ioctl.h>
  15 #include <fnmatch.h>
  16 #include <net/if.h>
  17 #include <net/if_arp.h>
  18
  19 #include "ip_common.h"  /* #include "libbb.h" is inside */
  20 #include "rt_names.h"
  21 #include "utils.h"
  22
  23
  24 typedef struct filter_t {
  25         int ifindex;
  26         int family;
  27         int oneline;
  28         int showqueue;
  29         inet_prefix pfx;
  30         int scope, scopemask;
  31         int flags, flagmask;
  32         int up;
  33         char *label;
  34         int flushed;
  35         char *flushb;
  36         int flushp;
  37         int flushe;
  38         struct rtnl_handle *rth;
  39 } filter_t;
  40
  41 #define filter (*(filter_t*)&bb_common_bufsiz1)
  42
  43
  44 static void print_link_flags(FILE *fp, unsigned flags, unsigned mdown)
  45 {
  46         fprintf(fp, "<");
  47         flags &= ~IFF_RUNNING;
  48 #define _PF(f) if (flags&IFF_##f) { \
  49                   flags &= ~IFF_##f; \
  50                   fprintf(fp, #f "%s", flags ? "," : ""); }
  51         _PF(LOOPBACK);
  52         _PF(BROADCAST);
  53         _PF(POINTOPOINT);
  54         _PF(MULTICAST);
  55         _PF(NOARP);
  56 #if 0
  57         _PF(ALLMULTI);
  58         _PF(PROMISC);
  59         _PF(MASTER);
  60         _PF(SLAVE);
  61         _PF(DEBUG);
  62         _PF(DYNAMIC);
  63         _PF(AUTOMEDIA);
  64         _PF(PORTSEL);
  65         _PF(NOTRAILERS);
  66 #endif
  67         _PF(UP);
  68 #undef _PF
  69         if (flags)
  70                 fprintf(fp, "%x", flags);
  71         if (mdown)
  72                 fprintf(fp, ",M-DOWN");
  73         fprintf(fp, "> ");
  74 }
  75
  76 static void print_queuelen(char *name)
  77 {
  78         struct ifreq ifr;
  79         int s;
  80
  81         s = socket(AF_INET, SOCK_STREAM, 0);
  82         if (s < 0)
  83                 return;
  84
  85         memset(&ifr, 0, sizeof(ifr));
  86         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
  87         if (ioctl_or_warn(s, SIOCGIFTXQLEN, &ifr) < 0) {
  88                 close(s);
  89                 return;
  90         }
  91         close(s);
  92
  93         if (ifr.ifr_qlen)
  94                 printf("qlen %d", ifr.ifr_qlen);
  95 }
  96
  97 static int print_linkinfo(struct sockaddr_nl ATTRIBUTE_UNUSED *who,
  98                 const struct nlmsghdr *n, void ATTRIBUTE_UNUSED *arg)
  99 {
 100         FILE *fp = (FILE*)arg;
 101         struct ifinfomsg *ifi = NLMSG_DATA(n);
 102         struct rtattr * tb[IFLA_MAX+1];
 103         int len = n->nlmsg_len;
 104         unsigned m_flag = 0;
 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 (filter.ifindex && ifi->ifi_index != filter.ifindex)
 114                 return 0;
 115         if (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 (filter.label
 125          && (!filter.family || filter.family == AF_PACKET)
 126          && fnmatch(filter.label, RTA_DATA(tb[IFLA_IFNAME]), 0)
 127         ) {
 128                 return 0;
 129         }
 130
 131         if (n->nlmsg_type == RTM_DELLINK)
 132                 fprintf(fp, "Deleted ");
 133
 134         fprintf(fp, "%d: %s", ifi->ifi_index,
 135                 tb[IFLA_IFNAME] ? (char*)RTA_DATA(tb[IFLA_IFNAME]) : "<nil>");
 136
 137         if (tb[IFLA_LINK]) {
 138                 SPRINT_BUF(b1);
 139                 int iflink = *(int*)RTA_DATA(tb[IFLA_LINK]);
 140                 if (iflink == 0)
 141                         fprintf(fp, "@NONE: ");
 142                 else {
 143                         fprintf(fp, "@%s: ", ll_idx_n2a(iflink, b1));
 144                         m_flag = ll_index_to_flags(iflink);
 145                         m_flag = !(m_flag & IFF_UP);
 146                 }
 147         } else {
 148                 fprintf(fp, ": ");
 149         }
 150         print_link_flags(fp, ifi->ifi_flags, m_flag);
 151
 152         if (tb[IFLA_MTU])
 153                 fprintf(fp, "mtu %u ", *(int*)RTA_DATA(tb[IFLA_MTU]));
 154         if (tb[IFLA_QDISC])
 155                 fprintf(fp, "qdisc %s ", (char*)RTA_DATA(tb[IFLA_QDISC]));
 156 #ifdef IFLA_MASTER
 157         if (tb[IFLA_MASTER]) {
 158                 SPRINT_BUF(b1);
 159                 fprintf(fp, "master %s ", ll_idx_n2a(*(int*)RTA_DATA(tb[IFLA_MASTER]), b1));
 160         }
 161 #endif
 162         if (filter.showqueue)
 163                 print_queuelen((char*)RTA_DATA(tb[IFLA_IFNAME]));
 164
 165         if (!filter.family || filter.family == AF_PACKET) {
 166                 SPRINT_BUF(b1);
 167                 fprintf(fp, "%c    link/%s ", _SL_, ll_type_n2a(ifi->ifi_type, b1, sizeof(b1)));
 168
 169                 if (tb[IFLA_ADDRESS]) {
 170                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_ADDRESS]),
 171                                                       RTA_PAYLOAD(tb[IFLA_ADDRESS]),
 172                                                       ifi->ifi_type,
 173                                                       b1, sizeof(b1)), fp);
 174                 }
 175                 if (tb[IFLA_BROADCAST]) {
 176                         if (ifi->ifi_flags & IFF_POINTOPOINT)
 177                                 fprintf(fp, " peer ");
 178                         else
 179                                 fprintf(fp, " brd ");
 180                         fputs(ll_addr_n2a(RTA_DATA(tb[IFLA_BROADCAST]),
 181                                                       RTA_PAYLOAD(tb[IFLA_BROADCAST]),
 182                                                       ifi->ifi_type,
 183                                                       b1, sizeof(b1)), fp);
 184                 }
 185         }
 186         fputc('\n', fp);
 187         fflush(fp);
 188         return 0;
 189 }
 190
 191 static int flush_update(void)
 192 {
 193         if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
 194                 bb_perror_msg("failed to send flush request");
 195                 return -1;
 196         }
 197         filter.flushp = 0;
 198         return 0;
 199 }
 200
 201 static int print_addrinfo(struct sockaddr_nl ATTRIBUTE_UNUSED *who,
 202                 struct nlmsghdr *n, void ATTRIBUTE_UNUSED *arg)
 203 {
 204         FILE *fp = (FILE*)arg;
 205         struct ifaddrmsg *ifa = NLMSG_DATA(n);
 206         int len = n->nlmsg_len;
 207         struct rtattr * rta_tb[IFA_MAX+1];
 208         char abuf[256];
 209         SPRINT_BUF(b1);
 210
 211         if (n->nlmsg_type != RTM_NEWADDR && n->nlmsg_type != RTM_DELADDR)
 212                 return 0;
 213         len -= NLMSG_LENGTH(sizeof(*ifa));
 214         if (len < 0) {
 215                 bb_error_msg("wrong nlmsg len %d", len);
 216                 return -1;
 217         }
 218
 219         if (filter.flushb && n->nlmsg_type != RTM_NEWADDR)
 220                 return 0;
 221
 222         memset(rta_tb, 0, sizeof(rta_tb));
 223         parse_rtattr(rta_tb, IFA_MAX, IFA_RTA(ifa), n->nlmsg_len - NLMSG_LENGTH(sizeof(*ifa)));
 224
 225         if (!rta_tb[IFA_LOCAL])
 226                 rta_tb[IFA_LOCAL] = rta_tb[IFA_ADDRESS];
 227         if (!rta_tb[IFA_ADDRESS])
 228                 rta_tb[IFA_ADDRESS] = rta_tb[IFA_LOCAL];
 229
 230         if (filter.ifindex && filter.ifindex != ifa->ifa_index)
 231                 return 0;
 232         if ((filter.scope^ifa->ifa_scope)&filter.scopemask)
 233                 return 0;
 234         if ((filter.flags^ifa->ifa_flags)&filter.flagmask)
 235                 return 0;
 236         if (filter.label) {
 237                 const char *label;
 238                 if (rta_tb[IFA_LABEL])
 239                         label = RTA_DATA(rta_tb[IFA_LABEL]);
 240                 else
 241                         label = ll_idx_n2a(ifa->ifa_index, b1);
 242                 if (fnmatch(filter.label, label, 0) != 0)
 243                         return 0;
 244         }
 245         if (filter.pfx.family) {
 246                 if (rta_tb[IFA_LOCAL]) {
 247                         inet_prefix dst;
 248                         memset(&dst, 0, sizeof(dst));
 249                         dst.family = ifa->ifa_family;
 250                         memcpy(&dst.data, RTA_DATA(rta_tb[IFA_LOCAL]), RTA_PAYLOAD(rta_tb[IFA_LOCAL]));
 251                         if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
 252                                 return 0;
 253                 }
 254         }
 255
 256         if (filter.flushb) {
 257                 struct nlmsghdr *fn;
 258                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 259                         if (flush_update())
 260                                 return -1;
 261                 }
 262                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 263                 memcpy(fn, n, n->nlmsg_len);
 264                 fn->nlmsg_type = RTM_DELADDR;
 265                 fn->nlmsg_flags = NLM_F_REQUEST;
 266                 fn->nlmsg_seq = ++filter.rth->seq;
 267                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 268                 filter.flushed++;
 269                 return 0;
 270         }
 271
 272         if (n->nlmsg_type == RTM_DELADDR)
 273                 fprintf(fp, "Deleted ");
 274
 275         if (filter.oneline)
 276                 fprintf(fp, "%u: %s", ifa->ifa_index, ll_index_to_name(ifa->ifa_index));
 277         if (ifa->ifa_family == AF_INET)
 278                 fprintf(fp, "    inet ");
 279         else if (ifa->ifa_family == AF_INET6)
 280                 fprintf(fp, "    inet6 ");
 281         else
 282                 fprintf(fp, "    family %d ", ifa->ifa_family);
 283
 284         if (rta_tb[IFA_LOCAL]) {
 285                 fputs(rt_addr_n2a(ifa->ifa_family,
 286                                               RTA_PAYLOAD(rta_tb[IFA_LOCAL]),
 287                                               RTA_DATA(rta_tb[IFA_LOCAL]),
 288                                               abuf, sizeof(abuf)), fp);
 289
 290                 if (rta_tb[IFA_ADDRESS] == NULL ||
 291                     memcmp(RTA_DATA(rta_tb[IFA_ADDRESS]), RTA_DATA(rta_tb[IFA_LOCAL]), 4) == 0) {
 292                         fprintf(fp, "/%d ", ifa->ifa_prefixlen);
 293                 } else {
 294                         fprintf(fp, " peer %s/%d ",
 295                                 rt_addr_n2a(ifa->ifa_family,
 296                                             RTA_PAYLOAD(rta_tb[IFA_ADDRESS]),
 297                                             RTA_DATA(rta_tb[IFA_ADDRESS]),
 298                                             abuf, sizeof(abuf)),
 299                                 ifa->ifa_prefixlen);
 300                 }
 301         }
 302
 303         if (rta_tb[IFA_BROADCAST]) {
 304                 fprintf(fp, "brd %s ",
 305                         rt_addr_n2a(ifa->ifa_family,
 306                                     RTA_PAYLOAD(rta_tb[IFA_BROADCAST]),
 307                                     RTA_DATA(rta_tb[IFA_BROADCAST]),
 308                                     abuf, sizeof(abuf)));
 309         }
 310         if (rta_tb[IFA_ANYCAST]) {
 311                 fprintf(fp, "any %s ",
 312                         rt_addr_n2a(ifa->ifa_family,
 313                                     RTA_PAYLOAD(rta_tb[IFA_ANYCAST]),
 314                                     RTA_DATA(rta_tb[IFA_ANYCAST]),
 315                                     abuf, sizeof(abuf)));
 316         }
 317         fprintf(fp, "scope %s ", rtnl_rtscope_n2a(ifa->ifa_scope, b1, sizeof(b1)));
 318         if (ifa->ifa_flags&IFA_F_SECONDARY) {
 319                 ifa->ifa_flags &= ~IFA_F_SECONDARY;
 320                 fprintf(fp, "secondary ");
 321         }
 322         if (ifa->ifa_flags&IFA_F_TENTATIVE) {
 323                 ifa->ifa_flags &= ~IFA_F_TENTATIVE;
 324                 fprintf(fp, "tentative ");
 325         }
 326         if (ifa->ifa_flags&IFA_F_DEPRECATED) {
 327                 ifa->ifa_flags &= ~IFA_F_DEPRECATED;
 328                 fprintf(fp, "deprecated ");
 329         }
 330         if (!(ifa->ifa_flags&IFA_F_PERMANENT)) {
 331                 fprintf(fp, "dynamic ");
 332         } else
 333                 ifa->ifa_flags &= ~IFA_F_PERMANENT;
 334         if (ifa->ifa_flags)
 335                 fprintf(fp, "flags %02x ", ifa->ifa_flags);
 336         if (rta_tb[IFA_LABEL])
 337                 fputs((char*)RTA_DATA(rta_tb[IFA_LABEL]), fp);
 338         if (rta_tb[IFA_CACHEINFO]) {
 339                 struct ifa_cacheinfo *ci = RTA_DATA(rta_tb[IFA_CACHEINFO]);
 340                 char buf[128];
 341                 fputc(_SL_, fp);
 342                 if (ci->ifa_valid == 0xFFFFFFFFU)
 343                         sprintf(buf, "valid_lft forever");
 344                 else
 345                         sprintf(buf, "valid_lft %dsec", ci->ifa_valid);
 346                 if (ci->ifa_prefered == 0xFFFFFFFFU)
 347                         sprintf(buf+strlen(buf), " preferred_lft forever");
 348                 else
 349                         sprintf(buf+strlen(buf), " preferred_lft %dsec", ci->ifa_prefered);
 350                 fprintf(fp, "       %s", buf);
 351         }
 352         fputc('\n', fp);
 353         fflush(fp);
 354         return 0;
 355 }
 356
 357
 358 struct nlmsg_list
 359 {
 360         struct nlmsg_list *next;
 361         struct nlmsghdr   h;
 362 };
 363
 364 static int print_selected_addrinfo(int ifindex, struct nlmsg_list *ainfo, FILE *fp)
 365 {
 366         for (; ainfo; ainfo = ainfo->next) {
 367                 struct nlmsghdr *n = &ainfo->h;
 368                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 369
 370                 if (n->nlmsg_type != RTM_NEWADDR)
 371                         continue;
 372
 373                 if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifa)))
 374                         return -1;
 375
 376                 if (ifa->ifa_index != ifindex ||
 377                     (filter.family && filter.family != ifa->ifa_family))
 378                         continue;
 379
 380                 print_addrinfo(NULL, n, fp);
 381         }
 382         return 0;
 383 }
 384
 385
 386 static int store_nlmsg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 387 {
 388         struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
 389         struct nlmsg_list *h;
 390         struct nlmsg_list **lp;
 391
 392         h = malloc(n->nlmsg_len+sizeof(void*));
 393         if (h == NULL)
 394                 return -1;
 395
 396         memcpy(&h->h, n, n->nlmsg_len);
 397         h->next = NULL;
 398
 399         for (lp = linfo; *lp; lp = &(*lp)->next) /* NOTHING */;
 400         *lp = h;
 401
 402         ll_remember_index(who, n, NULL);
 403         return 0;
 404 }
 405
 406 static void ipaddr_reset_filter(int _oneline)
 407 {
 408         memset(&filter, 0, sizeof(filter));
 409         filter.oneline = _oneline;
 410 }
 411
 412 /* Return value becomes exitcode. It's okay to not return at all */
 413 int ipaddr_list_or_flush(char **argv, int flush)
 414 {
 415         static const char option[] ALIGN1 = "to\0""scope\0""up\0""label\0""dev\0";
 416
 417         struct nlmsg_list *linfo = NULL;
 418         struct nlmsg_list *ainfo = NULL;
 419         struct nlmsg_list *l;
 420         struct rtnl_handle rth;
 421         char *filter_dev = NULL;
 422         int no_link = 0;
 423
 424         ipaddr_reset_filter(oneline);
 425         filter.showqueue = 1;
 426
 427         if (filter.family == AF_UNSPEC)
 428                 filter.family = preferred_family;
 429
 430         if (flush) {
 431                 if (!*argv) {
 432                         bb_error_msg_and_die(bb_msg_requires_arg, "flush");
 433                 }
 434                 if (filter.family == AF_PACKET) {
 435                         bb_error_msg_and_die("cannot flush link addresses");
 436                 }
 437         }
 438
 439         while (*argv) {
 440                 const int option_num = index_in_strings(option, *argv);
 441                 switch (option_num) {
 442                         case 0: /* to */
 443                                 NEXT_ARG();
 444                                 get_prefix(&filter.pfx, *argv, filter.family);
 445                                 if (filter.family == AF_UNSPEC) {
 446                                         filter.family = filter.pfx.family;
 447                                 }
 448                                 break;
 449                         case 1: /* scope */
 450                         {
 451                                 uint32_t scope = 0;
 452                                 NEXT_ARG();
 453                                 filter.scopemask = -1;
 454                                 if (rtnl_rtscope_a2n(&scope, *argv)) {
 455                                         if (strcmp(*argv, "all") != 0) {
 456                                                 invarg(*argv, "scope");
 457                                         }
 458                                         scope = RT_SCOPE_NOWHERE;
 459                                         filter.scopemask = 0;
 460                                 }
 461                                 filter.scope = scope;
 462                                 break;
 463                         }
 464                         case 2: /* up */
 465                                 filter.up = 1;
 466                                 break;
 467                         case 3: /* label */
 468                                 NEXT_ARG();
 469                                 filter.label = *argv;
 470                                 break;
 471                         case 4: /* dev */
 472                                 NEXT_ARG();
 473                         default:
 474                                 if (filter_dev) {
 475                                         duparg2("dev", *argv);
 476                                 }
 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                 filter.ifindex = xll_name_to_index(filter_dev);
 489         }
 490
 491         if (flush) {
 492                 char flushb[4096-512];
 493
 494                 filter.flushb = flushb;
 495                 filter.flushp = 0;
 496                 filter.flushe = sizeof(flushb);
 497                 filter.rth = &rth;
 498
 499                 for (;;) {
 500                         xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
 501                         filter.flushed = 0;
 502                         xrtnl_dump_filter(&rth, print_addrinfo, stdout);
 503                         if (filter.flushed == 0) {
 504                                 return 0;
 505                         }
 506                         if (flush_update() < 0)
 507                                 return 1;
 508                 }
 509         }
 510
 511         if (filter.family != AF_PACKET) {
 512                 xrtnl_wilddump_request(&rth, filter.family, RTM_GETADDR);
 513                 xrtnl_dump_filter(&rth, store_nlmsg, &ainfo);
 514         }
 515
 516
 517         if (filter.family && filter.family != AF_PACKET) {
 518                 struct nlmsg_list **lp;
 519                 lp = &linfo;
 520
 521                 if (filter.oneline)
 522                         no_link = 1;
 523
 524                 while ((l = *lp) != NULL) {
 525                         int ok = 0;
 526                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 527                         struct nlmsg_list *a;
 528
 529                         for (a = ainfo; a; a = a->next) {
 530                                 struct nlmsghdr *n = &a->h;
 531                                 struct ifaddrmsg *ifa = NLMSG_DATA(n);
 532
 533                                 if (ifa->ifa_index != ifi->ifi_index ||
 534                                     (filter.family && filter.family != ifa->ifa_family))
 535                                         continue;
 536                                 if ((filter.scope ^ ifa->ifa_scope) & filter.scopemask)
 537                                         continue;
 538                                 if ((filter.flags ^ ifa->ifa_flags) & filter.flagmask)
 539                                         continue;
 540                                 if (filter.pfx.family || 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 (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, &filter.pfx, filter.pfx.bitlen))
 553                                                         continue;
 554                                         }
 555                                         if (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(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(NULL, &l->h, stdout) == 0) {
 579                         struct ifinfomsg *ifi = NLMSG_DATA(&l->h);
 580                         if (filter.family != AF_PACKET)
 581                                 print_selected_addrinfo(ifi->ifi_index, ainfo, stdout);
 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 int option_num = index_in_strings(option, *argv);
 628                 switch (option_num) {
 629                         case 0: /* peer */
 630                         case 1: /* remote */
 631                                 NEXT_ARG();
 632
 633                                 if (peer_len) {
 634                                         duparg("peer", *argv);
 635                                 }
 636                                 get_prefix(&peer, *argv, req.ifa.ifa_family);
 637                                 peer_len = peer.bytelen;
 638                                 if (req.ifa.ifa_family == AF_UNSPEC) {
 639                                         req.ifa.ifa_family = peer.family;
 640                                 }
 641                                 addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &peer.data, peer.bytelen);
 642                                 req.ifa.ifa_prefixlen = peer.bitlen;
 643                                 break;
 644                         case 2: /* broadcast */
 645                         case 3: /* brd */
 646                         {
 647                                 inet_prefix addr;
 648                                 NEXT_ARG();
 649                                 if (brd_len) {
 650                                         duparg("broadcast", *argv);
 651                                 }
 652                                 if (LONE_CHAR(*argv, '+')) {
 653                                         brd_len = -1;
 654                                 } else if (LONE_DASH(*argv)) {
 655                                         brd_len = -2;
 656                                 } else {
 657                                         get_addr(&addr, *argv, req.ifa.ifa_family);
 658                                         if (req.ifa.ifa_family == AF_UNSPEC)
 659                                                 req.ifa.ifa_family = addr.family;
 660                                         addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &addr.data, addr.bytelen);
 661                                         brd_len = addr.bytelen;
 662                                 }
 663                                 break;
 664                         }
 665                         case 4: /* anycast */
 666                         {
 667                                 inet_prefix addr;
 668                                 NEXT_ARG();
 669                                 if (any_len) {
 670                                         duparg("anycast", *argv);
 671                                 }
 672                                 get_addr(&addr, *argv, req.ifa.ifa_family);
 673                                 if (req.ifa.ifa_family == AF_UNSPEC) {
 674                                         req.ifa.ifa_family = addr.family;
 675                                 }
 676                                 addattr_l(&req.n, sizeof(req), IFA_ANYCAST, &addr.data, addr.bytelen);
 677                                 any_len = addr.bytelen;
 678                                 break;
 679                         }
 680                         case 5: /* scope */
 681                         {
 682                                 uint32_t scope = 0;
 683                                 NEXT_ARG();
 684                                 if (rtnl_rtscope_a2n(&scope, *argv)) {
 685                                         invarg(*argv, "scope");
 686                                 }
 687                                 req.ifa.ifa_scope = scope;
 688                                 scoped = 1;
 689                                 break;
 690                         }
 691                         case 6: /* dev */
 692                                 NEXT_ARG();
 693                                 d = *argv;
 694                                 break;
 695                         case 7: /* label */
 696                                 NEXT_ARG();
 697                                 l = *argv;
 698                                 addattr_l(&req.n, sizeof(req), IFA_LABEL, l, strlen(l)+1);
 699                                 break;
 700                         case 8: /* local */
 701                                 NEXT_ARG();
 702                         default:
 703                                 if (local_len) {
 704                                         duparg2("local", *argv);
 705                                 }
 706                                 get_prefix(&lcl, *argv, req.ifa.ifa_family);
 707                                 if (req.ifa.ifa_family == AF_UNSPEC) {
 708                                         req.ifa.ifa_family = lcl.family;
 709                                 }
 710                                 addattr_l(&req.n, sizeof(req), IFA_LOCAL, &lcl.data, lcl.bytelen);
 711                                 local_len = lcl.bytelen;
 712                 }
 713                 argv++;
 714         }
 715
 716         if (d == NULL) {
 717                 bb_error_msg(bb_msg_requires_arg, "\"dev\"");
 718                 return -1;
 719         }
 720         if (l && strncmp(d, l, strlen(d)) != 0) {
 721                 bb_error_msg_and_die("\"dev\" (%s) must match \"label\" (%s)", d, l);
 722         }
 723
 724         if (peer_len == 0 && local_len && cmd != RTM_DELADDR) {
 725                 peer = lcl;
 726                 addattr_l(&req.n, sizeof(req), IFA_ADDRESS, &lcl.data, lcl.bytelen);
 727         }
 728         if (req.ifa.ifa_prefixlen == 0)
 729                 req.ifa.ifa_prefixlen = lcl.bitlen;
 730
 731         if (brd_len < 0 && cmd != RTM_DELADDR) {
 732                 inet_prefix brd;
 733                 int i;
 734                 if (req.ifa.ifa_family != AF_INET) {
 735                         bb_error_msg_and_die("broadcast can be set only for IPv4 addresses");
 736                 }
 737                 brd = peer;
 738                 if (brd.bitlen <= 30) {
 739                         for (i=31; i>=brd.bitlen; i--) {
 740                                 if (brd_len == -1)
 741                                         brd.data[0] |= htonl(1<<(31-i));
 742                                 else
 743                                         brd.data[0] &= ~htonl(1<<(31-i));
 744                         }
 745                         addattr_l(&req.n, sizeof(req), IFA_BROADCAST, &brd.data, brd.bytelen);
 746                         brd_len = brd.bytelen;
 747                 }
 748         }
 749         if (!scoped && cmd != RTM_DELADDR)
 750                 req.ifa.ifa_scope = default_scope(&lcl);
 751
 752         xrtnl_open(&rth);
 753
 754         ll_init_map(&rth);
 755
 756         req.ifa.ifa_index = xll_name_to_index(d);
 757
 758         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 759                 return 2;
 760
 761         return 0;
 762 }
 763
 764 /* Return value becomes exitcode. It's okay to not return at all */
 765 int do_ipaddr(char **argv)
 766 {
 767         static const char commands[] ALIGN1 =
 768                 "add\0""delete\0""list\0""show\0""lst\0""flush\0";
 769
 770         int command_num = 2; /* default command is list */
 771
 772         if (*argv) {
 773                 command_num = index_in_substrings(commands, *argv);
 774                 if (command_num < 0 || command_num > 5)
 775                         bb_error_msg_and_die("unknown command %s", *argv);
 776                 argv++;
 777         }
 778         if (command_num == 0) /* add */
 779                 return ipaddr_modify(RTM_NEWADDR, argv);
 780         if (command_num == 1) /* delete */
 781                 return ipaddr_modify(RTM_DELADDR, argv);
 782         if (command_num == 5) /* flush */
 783                 return ipaddr_list_or_flush(argv, 1);
 784         /* 2 == list, 3 == show, 4 == lst */
 785         return ipaddr_list_or_flush(argv, 0);
 786 }