nest/iface.c

   1 /*
   2  *      BIRD -- Management of Interfaces and Neighbor Cache
   3  *
   4  *      (c) 1998--2000 Martin Mares <mj@ucw.cz>
   5  *
   6  *      Can be freely distributed and used under the terms of the GNU GPL.
   7  */
   8
   9 /**
  10  * DOC: Interfaces
  11  *
  12  * The interface module keeps track of all network interfaces in the
  13  * system and their addresses.
  14  *
  15  * Each interface is represented by an &iface structure which carries
  16  * interface capability flags (%IF_MULTIACCESS, %IF_BROADCAST etc.),
  17  * MTU, interface name and index and finally a linked list of network
  18  * prefixes assigned to the interface, each one represented by
  19  * struct &ifa.
  20  *
  21  * The interface module keeps a `soft-up' state for each &iface which
  22  * is a conjunction of link being up, the interface being of a `sane'
  23  * type and at least one IP address assigned to it.
  24  */
  25
  26 #undef LOCAL_DEBUG
  27
  28 #include "nest/bird.h"
  29 #include "nest/iface.h"
  30 #include "nest/protocol.h"
  31 #include "nest/cli.h"
  32 #include "lib/resource.h"
  33 #include "lib/string.h"
  34 #include "conf/conf.h"
  35
  36 static pool *if_pool;
  37
  38 static void auto_router_id(void);
  39
  40 list iface_list;
  41
  42 /**
  43  * ifa_dump - dump interface address
  44  * @a: interface address descriptor
  45  *
  46  * This function dumps contents of an &ifa to the debug output.
  47  */
  48 void
  49 ifa_dump(struct ifa *a)
  50 {
  51   debug("\t%I, net %I/%-2d bc %I -> %I%s%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
  52         (a->flags & IF_UP) ? "" : " DOWN",
  53         (a->flags & IA_PRIMARY) ? "" : " SEC",
  54         (a->flags & IA_UNNUMBERED) ? " UNNUM" : "");
  55 }
  56
  57 /**
  58  * if_dump - dump interface
  59  * @i: interface to dump
  60  *
  61  * This function dumps all information associated with a given
  62  * network interface to the debug output.
  63  */
  64 void
  65 if_dump(struct iface *i)
  66 {
  67   struct ifa *a;
  68
  69   debug("IF%d: %s", i->index, i->name);
  70   if (i->flags & IF_ADMIN_DOWN)
  71     debug(" ADMIN-DOWN");
  72   if (i->flags & IF_UP)
  73     debug(" UP");
  74   else
  75     debug(" DOWN");
  76   if (i->flags & IF_LINK_UP)
  77     debug(" LINK-UP");
  78   if (i->flags & IF_MULTIACCESS)
  79     debug(" MA");
  80   if (i->flags & IF_BROADCAST)
  81     debug(" BC");
  82   if (i->flags & IF_MULTICAST)
  83     debug(" MC");
  84   if (i->flags & IF_LOOPBACK)
  85     debug(" LOOP");
  86   if (i->flags & IF_IGNORE)
  87     debug(" IGN");
  88   if (i->flags & IF_TMP_DOWN)
  89     debug(" TDOWN");
  90   debug(" MTU=%d\n", i->mtu);
  91   WALK_LIST(a, i->addrs)
  92     {
  93       ifa_dump(a);
  94       ASSERT((a != i->addr) == !(a->flags & IA_PRIMARY));
  95     }
  96 }
  97
  98 /**
  99  * if_dump_all - dump all interfaces
 100  *
 101  * This function dumps information about all known network
 102  * interfaces to the debug output.
 103  */
 104 void
 105 if_dump_all(void)
 106 {
 107   struct iface *i;
 108
 109   debug("Known network interfaces:\n");
 110   WALK_LIST(i, iface_list)
 111     if_dump(i);
 112   debug("Router ID: %08x\n", config->router_id);
 113 }
 114
 115 static inline unsigned
 116 if_what_changed(struct iface *i, struct iface *j)
 117 {
 118   unsigned c;
 119
 120   if (((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED | IF_LINK_UP | IF_TMP_DOWN | IF_JUST_CREATED))
 121       || i->index != j->index)
 122     return IF_CHANGE_TOO_MUCH;
 123   c = 0;
 124   if ((i->flags ^ j->flags) & IF_UP)
 125     c |= (i->flags & IF_UP) ? IF_CHANGE_DOWN : IF_CHANGE_UP;
 126   if (i->mtu != j->mtu)
 127     c |= IF_CHANGE_MTU;
 128   return c;
 129 }
 130
 131 static inline void
 132 if_copy(struct iface *to, struct iface *from)
 133 {
 134   to->flags = from->flags | (to->flags & IF_TMP_DOWN);
 135   to->mtu = from->mtu;
 136 }
 137
 138 static inline void
 139 ifa_send_notify(struct proto *p, unsigned c, struct ifa *a)
 140 {
 141   if (p->ifa_notify)
 142     {
 143       if (p->debug & D_IFACES)
 144         log(L_TRACE "%s < %s address %I/%d on interface %s %s",
 145             p->name, (a->flags & IA_PRIMARY) ? "primary" : "secondary",
 146             a->prefix, a->pxlen, a->iface->name,
 147             (c & IF_CHANGE_UP) ? "added" : "removed");
 148       p->ifa_notify(p, c, a);
 149     }
 150 }
 151
 152 static void
 153 ifa_notify_change(unsigned c, struct ifa *a)
 154 {
 155   struct proto *p;
 156
 157   DBG("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
 158   WALK_LIST(p, active_proto_list)
 159     ifa_send_notify(p, c, a);
 160 }
 161
 162 static inline void
 163 if_send_notify(struct proto *p, unsigned c, struct iface *i)
 164 {
 165   if (p->if_notify)
 166     {
 167       if (p->debug & D_IFACES)
 168         log(L_TRACE "%s < interface %s %s", p->name, i->name,
 169             (c & IF_CHANGE_UP) ? "goes up" :
 170             (c & IF_CHANGE_DOWN) ? "goes down" :
 171             (c & IF_CHANGE_MTU) ? "changes MTU" :
 172             (c & IF_CHANGE_CREATE) ? "created" :
 173             "sends unknown event");
 174       p->if_notify(p, c, i);
 175     }
 176 }
 177
 178 static void
 179 if_notify_change(unsigned c, struct iface *i)
 180 {
 181   struct proto *p;
 182   struct ifa *a;
 183
 184   if (i->flags & IF_JUST_CREATED)
 185     {
 186       i->flags &= ~IF_JUST_CREATED;
 187       c |= IF_CHANGE_CREATE | IF_CHANGE_MTU;
 188     }
 189
 190   DBG("Interface change notification (%x) for %s\n", c, i->name);
 191 #ifdef LOCAL_DEBUG
 192   if_dump(i);
 193 #endif
 194
 195   if (c & IF_CHANGE_UP)
 196     neigh_if_up(i);
 197   if (c & IF_CHANGE_DOWN)
 198     WALK_LIST(a, i->addrs)
 199       {
 200         a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 201         ifa_notify_change(IF_CHANGE_DOWN, a);
 202       }
 203
 204   WALK_LIST(p, active_proto_list)
 205     if_send_notify(p, c, i);
 206
 207   if (c & IF_CHANGE_UP)
 208     WALK_LIST(a, i->addrs)
 209       {
 210         a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 211         ifa_notify_change(IF_CHANGE_UP, a);
 212       }
 213   if (c & IF_CHANGE_DOWN)
 214     neigh_if_down(i);
 215 }
 216
 217 static unsigned
 218 if_recalc_flags(struct iface *i, unsigned flags)
 219 {
 220   if ((flags & (IF_ADMIN_DOWN | IF_TMP_DOWN)) ||
 221       !(flags & IF_LINK_UP) ||
 222       !i->addr)
 223     flags &= ~IF_UP;
 224   else
 225     flags |= IF_UP;
 226   return flags;
 227 }
 228
 229 static void
 230 if_change_flags(struct iface *i, unsigned flags)
 231 {
 232   unsigned of = i->flags;
 233
 234   i->flags = if_recalc_flags(i, flags);
 235   if ((i->flags ^ of) & IF_UP)
 236     if_notify_change((i->flags & IF_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN, i);
 237 }
 238
 239 /**
 240  * if_update - update interface status
 241  * @new: new interface status
 242  *
 243  * if_update() is called by the low-level platform dependent code
 244  * whenever it notices an interface change.
 245  *
 246  * There exist two types of interface updates -- synchronous and asynchronous
 247  * ones. In the synchronous case, the low-level code calls if_start_update(),
 248  * scans all interfaces reported by the OS, uses if_update() and ifa_update()
 249  * to pass them to the core and then it finishes the update sequence by
 250  * calling if_end_update(). When working asynchronously, the sysdep code
 251  * calls if_update() and ifa_update() whenever it notices a change.
 252  *
 253  * if_update() will automatically notify all other modules about the change.
 254  */
 255 struct iface *
 256 if_update(struct iface *new)
 257 {
 258   struct iface *i;
 259   unsigned c;
 260
 261   WALK_LIST(i, iface_list)
 262     if (!strcmp(new->name, i->name))
 263       {
 264         new->addr = i->addr;
 265         new->flags = if_recalc_flags(new, new->flags);
 266         c = if_what_changed(i, new);
 267         if (c & IF_CHANGE_TOO_MUCH)     /* Changed a lot, convert it to down/up */
 268           {
 269             DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
 270             if_change_flags(i, i->flags | IF_TMP_DOWN);
 271             rem_node(&i->n);
 272             new->addr = i->addr;
 273             memcpy(&new->addrs, &i->addrs, sizeof(i->addrs));
 274             memcpy(i, new, sizeof(*i));
 275             goto newif;
 276           }
 277         else if (c)
 278           {
 279             if_copy(i, new);
 280             if_notify_change(c, i);
 281           }
 282         i->flags |= IF_UPDATED;
 283         return i;
 284       }
 285   i = mb_alloc(if_pool, sizeof(struct iface));
 286   memcpy(i, new, sizeof(*i));
 287   init_list(&i->addrs);
 288 newif:
 289   init_list(&i->neighbors);
 290   i->flags |= IF_UPDATED | IF_TMP_DOWN;         /* Tmp down as we don't have addresses yet */
 291   add_tail(&iface_list, &i->n);
 292   return i;
 293 }
 294
 295 void
 296 if_start_update(void)
 297 {
 298   struct iface *i;
 299   struct ifa *a;
 300
 301   WALK_LIST(i, iface_list)
 302     {
 303       i->flags &= ~IF_UPDATED;
 304       WALK_LIST(a, i->addrs)
 305         a->flags &= ~IF_UPDATED;
 306     }
 307 }
 308
 309 void
 310 if_end_partial_update(struct iface *i)
 311 {
 312   if (i->flags & IF_TMP_DOWN)
 313     if_change_flags(i, i->flags & ~IF_TMP_DOWN);
 314 }
 315
 316 void
 317 if_end_update(void)
 318 {
 319   struct iface *i;
 320   struct ifa *a, *b;
 321
 322   if (!config->router_id)
 323     auto_router_id();
 324
 325   WALK_LIST(i, iface_list)
 326     {
 327       if (!(i->flags & IF_UPDATED))
 328         if_change_flags(i, (i->flags & ~IF_LINK_UP) | IF_ADMIN_DOWN);
 329       else
 330         {
 331           WALK_LIST_DELSAFE(a, b, i->addrs)
 332             if (!(a->flags & IF_UPDATED))
 333               ifa_delete(a);
 334           if_end_partial_update(i);
 335         }
 336     }
 337 }
 338
 339 void
 340 if_flush_ifaces(struct proto *p)
 341 {
 342   if (p->debug & D_EVENTS)
 343     log(L_TRACE "%s: Flushing interfaces", p->name);
 344   if_start_update();
 345   if_end_update();
 346 }
 347
 348 /**
 349  * if_feed_baby - advertise interfaces to a new protocol
 350  * @p: protocol to feed
 351  *
 352  * When a new protocol starts, this function sends it a series
 353  * of notifications about all existing interfaces.
 354  */
 355 void
 356 if_feed_baby(struct proto *p)
 357 {
 358   struct iface *i;
 359   struct ifa *a;
 360
 361   if (!p->if_notify && !p->ifa_notify)  /* shortcut */
 362     return;
 363   DBG("Announcing interfaces to new protocol %s\n", p->name);
 364   WALK_LIST(i, iface_list)
 365     {
 366       if_send_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
 367       if (i->flags & IF_UP)
 368         WALK_LIST(a, i->addrs)
 369           ifa_send_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
 370     }
 371 }
 372
 373 /**
 374  * if_find_by_index - find interface by ifindex
 375  * @idx: ifindex
 376  *
 377  * This function finds an &iface structure corresponding to an interface
 378  * of the given index @idx. Returns a pointer to the structure or %NULL
 379  * if no such structure exists.
 380  */
 381 struct iface *
 382 if_find_by_index(unsigned idx)
 383 {
 384   struct iface *i;
 385
 386   WALK_LIST(i, iface_list)
 387     if (i->index == idx)
 388       return i;
 389   return NULL;
 390 }
 391
 392 /**
 393  * if_find_by_name - find interface by name
 394  * @name: interface name
 395  *
 396  * This function finds an &iface structure corresponding to an interface
 397  * of the given name @name. Returns a pointer to the structure or %NULL
 398  * if no such structure exists.
 399  */
 400 struct iface *
 401 if_find_by_name(char *name)
 402 {
 403   struct iface *i;
 404
 405   WALK_LIST(i, iface_list)
 406     if (!strcmp(i->name, name))
 407       return i;
 408   return NULL;
 409 }
 410
 411 struct ifa *kif_choose_primary(struct iface *i);
 412
 413 static int
 414 ifa_recalc_primary(struct iface *i)
 415 {
 416   struct ifa *a = kif_choose_primary(i);
 417
 418   if (a == i->addr)
 419     return 0;
 420
 421   if (i->addr)
 422     i->addr->flags &= ~IA_PRIMARY;
 423
 424   if (a)
 425     {
 426       a->flags |= IA_PRIMARY;
 427       rem_node(&a->n);
 428       add_head(&i->addrs, &a->n);
 429     }
 430
 431   i->addr = a;
 432   return 1;
 433 }
 434
 435 void
 436 ifa_recalc_all_primary_addresses(void)
 437 {
 438   struct iface *i;
 439
 440   WALK_LIST(i, iface_list)
 441     {
 442       if (ifa_recalc_primary(i))
 443         if_change_flags(i, i->flags | IF_TMP_DOWN);
 444     }
 445 }
 446
 447
 448 /**
 449  * ifa_update - update interface address
 450  * @a: new interface address
 451  *
 452  * This function adds address information to a network
 453  * interface. It's called by the platform dependent code during
 454  * the interface update process described under if_update().
 455  */
 456 struct ifa *
 457 ifa_update(struct ifa *a)
 458 {
 459   struct iface *i = a->iface;
 460   struct ifa *b;
 461
 462   WALK_LIST(b, i->addrs)
 463     if (ipa_equal(b->ip, a->ip))
 464       {
 465         if (ipa_equal(b->prefix, a->prefix) &&
 466             b->pxlen == a->pxlen &&
 467             ipa_equal(b->brd, a->brd) &&
 468             ipa_equal(b->opposite, a->opposite) &&
 469             b->scope == a->scope &&
 470             !((b->flags ^ a->flags) & IA_UNNUMBERED))
 471           {
 472             b->flags |= IF_UPDATED;
 473             return b;
 474           }
 475         ifa_delete(b);
 476         break;
 477       }
 478
 479   if (!(i->flags & IF_MULTIACCESS) && a->pxlen < BITS_PER_IP_ADDRESS - 2)
 480     log(L_WARN "Strange prefix length %d for point-to-point interface %s", a->pxlen, i->name);
 481 #ifndef IPV6
 482   if ((i->flags & IF_BROADCAST) && !ipa_nonzero(a->brd))
 483     log(L_ERR "Missing broadcast address for interface %s", i->name);
 484 #endif
 485
 486   b = mb_alloc(if_pool, sizeof(struct ifa));
 487   memcpy(b, a, sizeof(struct ifa));
 488   add_tail(&i->addrs, &b->n);
 489   b->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 490   if (ifa_recalc_primary(i))
 491     if_change_flags(i, i->flags | IF_TMP_DOWN);
 492   if (b->flags & IF_UP)
 493     ifa_notify_change(IF_CHANGE_CREATE | IF_CHANGE_UP, b);
 494   return b;
 495 }
 496
 497 /**
 498  * ifa_delete - remove interface address
 499  * @a: interface address
 500  *
 501  * This function removes address information from a network
 502  * interface. It's called by the platform dependent code during
 503  * the interface update process described under if_update().
 504  */
 505 void
 506 ifa_delete(struct ifa *a)
 507 {
 508   struct iface *i = a->iface;
 509   struct ifa *b;
 510
 511   WALK_LIST(b, i->addrs)
 512     if (ipa_equal(b->ip, a->ip))
 513       {
 514         rem_node(&b->n);
 515         if (b->flags & IF_UP)
 516           {
 517             b->flags &= ~IF_UP;
 518             ifa_notify_change(IF_CHANGE_DOWN, b);
 519           }
 520         if (b->flags & IA_PRIMARY)
 521           {
 522             if_change_flags(i, i->flags | IF_TMP_DOWN);
 523             ifa_recalc_primary(i);
 524           }
 525         mb_free(b);
 526         return;
 527       }
 528 }
 529
 530 static void
 531 auto_router_id(void)
 532 {
 533 #ifndef IPV6
 534   struct iface *i, *j;
 535
 536   j = NULL;
 537   WALK_LIST(i, iface_list)
 538     if ((i->flags & IF_LINK_UP) &&
 539         !(i->flags & (IF_IGNORE | IF_ADMIN_DOWN)) &&
 540         i->addr &&
 541         !(i->addr->flags & IA_UNNUMBERED) &&
 542         (!j || ipa_to_u32(i->addr->ip) < ipa_to_u32(j->addr->ip)))
 543       j = i;
 544   if (!j)
 545     die("Cannot determine router ID (no suitable network interface found), please configure it manually");
 546   log(L_INFO "Guessed router ID %I according to interface %s", j->addr->ip, j->name);
 547   config->router_id = ipa_to_u32(j->addr->ip);
 548 #endif
 549 }
 550
 551 /**
 552  * if_init - initialize interface module
 553  *
 554  * This function is called during BIRD startup to initialize
 555  * all data structures of the interface module.
 556  */
 557 void
 558 if_init(void)
 559 {
 560   if_pool = rp_new(&root_pool, "Interfaces");
 561   init_list(&iface_list);
 562   neigh_init(if_pool);
 563 }
 564
 565 /*
 566  *      Interface Pattern Lists
 567  */
 568
 569 int
 570 iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a)
 571 {
 572   struct iface_patt_node *p;
 573
 574   WALK_LIST(p, ifp->ipn_list)
 575     {
 576       char *t = p->pattern;
 577       int pos = p->positive;
 578
 579       if (t)
 580         {
 581           if (*t == '-')
 582             {
 583               t++;
 584               pos = !pos;
 585             }
 586
 587           if (!patmatch(t, i->name))
 588             continue;
 589         }
 590
 591       if (p->pxlen == 0)
 592         return pos;
 593
 594       if (!a)
 595         continue;
 596
 597       if (ipa_in_net(a->ip, p->prefix, p->pxlen))
 598         return pos;
 599
 600       if ((a->flags & IA_UNNUMBERED) &&
 601           ipa_in_net(a->opposite, p->prefix, p->pxlen))
 602         return pos;
 603
 604       continue;
 605     }
 606
 607   return 0;
 608 }
 609
 610 struct iface_patt *
 611 iface_patt_find(list *l, struct iface *i, struct ifa *a)
 612 {
 613   struct iface_patt *p;
 614
 615   WALK_LIST(p, *l)
 616     if (iface_patt_match(p, i, a))
 617       return p;
 618
 619   return NULL;
 620 }
 621
 622 static int
 623 iface_plists_equal(struct iface_patt *pa, struct iface_patt *pb)
 624 {
 625   struct iface_patt_node *x, *y;
 626
 627   x = HEAD(pa->ipn_list);
 628   y = HEAD(pb->ipn_list);
 629   while (x->n.next && y->n.next)
 630     {
 631       if ((x->positive != y->positive) ||
 632           (!x->pattern && y->pattern) ||        /* This nasty lines where written by me... :-( Feela */
 633           (!y->pattern && x->pattern) ||
 634           ((x->pattern != y->pattern) && strcmp(x->pattern, y->pattern)) ||
 635           !ipa_equal(x->prefix, y->prefix) ||
 636           (x->pxlen != y->pxlen))
 637         return 0;
 638       x = (void *) x->n.next;
 639       y = (void *) y->n.next;
 640     }
 641   return (!x->n.next && !y->n.next);
 642 }
 643
 644 int
 645 iface_patts_equal(list *a, list *b, int (*comp)(struct iface_patt *, struct iface_patt *))
 646 {
 647   struct iface_patt *x, *y;
 648
 649   x = HEAD(*a);
 650   y = HEAD(*b);
 651   while (x->n.next && y->n.next)
 652     {
 653       if (!iface_plists_equal(x, y) ||
 654           (comp && !comp(x, y)))
 655         return 0;
 656       x = (void *) x->n.next;
 657       y = (void *) y->n.next;
 658     }
 659   return (!x->n.next && !y->n.next);
 660 }
 661
 662 /*
 663  *  CLI commands.
 664  */
 665
 666 static void
 667 if_show_addr(struct ifa *a)
 668 {
 669   byte broad[STD_ADDRESS_P_LENGTH + 16];
 670   byte opp[STD_ADDRESS_P_LENGTH + 16];
 671
 672   if (ipa_nonzero(a->brd))
 673     bsprintf(broad, ", broadcast %I", a->brd);
 674   else
 675     broad[0] = 0;
 676   if (ipa_nonzero(a->opposite))
 677     bsprintf(opp, ", opposite %I", a->opposite);
 678   else
 679     opp[0] = 0;
 680   cli_msg(-1003, "\t%I/%d (%s%s%s, scope %s%s)",
 681           a->ip, a->pxlen,
 682           (a->flags & IA_PRIMARY) ? "Primary" : (a->flags & IA_SECONDARY) ? "Secondary" : "Unselected",
 683           broad, opp,
 684           ip_scope_text(a->scope),
 685           (a->flags & IA_UNNUMBERED) ? ", unnumbered" : "");
 686 }
 687
 688 void
 689 if_show(void)
 690 {
 691   struct iface *i;
 692   struct ifa *a;
 693   char *type;
 694
 695   WALK_LIST(i, iface_list)
 696     {
 697       cli_msg(-1001, "%s %s (index=%d)", i->name, (i->flags & IF_UP) ? "up" : "DOWN", i->index);
 698       if (!(i->flags & IF_MULTIACCESS))
 699         type = "PtP";
 700       else
 701         type = "MultiAccess";
 702       cli_msg(-1004, "\t%s%s%s Admin%s Link%s%s%s MTU=%d",
 703               type,
 704               (i->flags & IF_BROADCAST) ? " Broadcast" : "",
 705               (i->flags & IF_MULTICAST) ? " Multicast" : "",
 706               (i->flags & IF_ADMIN_DOWN) ? "Down" : "Up",
 707               (i->flags & IF_LINK_UP) ? "Up" : "Down",
 708               (i->flags & IF_LOOPBACK) ? " Loopback" : "",
 709               (i->flags & IF_IGNORE) ? " Ignored" : "",
 710               i->mtu);
 711       if (i->addr)
 712         if_show_addr(i->addr);
 713       WALK_LIST(a, i->addrs)
 714         if (a != i->addr)
 715           if_show_addr(a);
 716     }
 717   cli_msg(0, "");
 718 }
 719
 720 void
 721 if_show_summary(void)
 722 {
 723   struct iface *i;
 724   byte addr[STD_ADDRESS_P_LENGTH + 16];
 725
 726   cli_msg(-2005, "interface state address");
 727   WALK_LIST(i, iface_list)
 728     {
 729       if (i->addr)
 730         bsprintf(addr, "%I/%d", i->addr->ip, i->addr->pxlen);
 731       else
 732         addr[0] = 0;
 733       cli_msg(-1005, "%-9s %-5s %s", i->name, (i->flags & IF_UP) ? "up" : "DOWN", addr);
 734     }
 735   cli_msg(0, "");
 736 }