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 list iface_list;
  39
  40 /**
  41  * ifa_dump - dump interface address
  42  * @a: interface address descriptor
  43  *
  44  * This function dumps contents of an &ifa to the debug output.
  45  */
  46 void
  47 ifa_dump(struct ifa *a)
  48 {
  49   debug("\t%I, net %N bc %I -> %I%s%s%s\n", a->ip, &a->prefix, a->brd, a->opposite,
  50         (a->flags & IF_UP) ? "" : " DOWN",
  51         (a->flags & IA_PRIMARY) ? "" : " SEC",
  52         (a->flags & IA_PEER) ? "PEER" : "");
  53 }
  54
  55 /**
  56  * if_dump - dump interface
  57  * @i: interface to dump
  58  *
  59  * This function dumps all information associated with a given
  60  * network interface to the debug output.
  61  */
  62 void
  63 if_dump(struct iface *i)
  64 {
  65   struct ifa *a;
  66
  67   debug("IF%d: %s", i->index, i->name);
  68   if (i->flags & IF_SHUTDOWN)
  69     debug(" SHUTDOWN");
  70   if (i->flags & IF_UP)
  71     debug(" UP");
  72   else
  73     debug(" DOWN");
  74   if (i->flags & IF_ADMIN_UP)
  75     debug(" LINK-UP");
  76   if (i->flags & IF_MULTIACCESS)
  77     debug(" MA");
  78   if (i->flags & IF_BROADCAST)
  79     debug(" BC");
  80   if (i->flags & IF_MULTICAST)
  81     debug(" MC");
  82   if (i->flags & IF_LOOPBACK)
  83     debug(" LOOP");
  84   if (i->flags & IF_IGNORE)
  85     debug(" IGN");
  86   if (i->flags & IF_TMP_DOWN)
  87     debug(" TDOWN");
  88   debug(" MTU=%d\n", i->mtu);
  89   WALK_LIST(a, i->addrs)
  90     {
  91       ifa_dump(a);
  92       ASSERT((a != i->addr) == !(a->flags & IA_PRIMARY));
  93     }
  94 }
  95
  96 /**
  97  * if_dump_all - dump all interfaces
  98  *
  99  * This function dumps information about all known network
 100  * interfaces to the debug output.
 101  */
 102 void
 103 if_dump_all(void)
 104 {
 105   struct iface *i;
 106
 107   debug("Known network interfaces:\n");
 108   WALK_LIST(i, iface_list)
 109     if_dump(i);
 110   debug("Router ID: %08x\n", config->router_id);
 111 }
 112
 113 static inline unsigned
 114 if_what_changed(struct iface *i, struct iface *j)
 115 {
 116   unsigned c;
 117
 118   if (((i->flags ^ j->flags) & ~(IF_UP | IF_SHUTDOWN | IF_UPDATED | IF_ADMIN_UP | IF_LINK_UP | IF_TMP_DOWN | IF_JUST_CREATED))
 119       || i->index != j->index)
 120     return IF_CHANGE_TOO_MUCH;
 121   c = 0;
 122   if ((i->flags ^ j->flags) & IF_UP)
 123     c |= (i->flags & IF_UP) ? IF_CHANGE_DOWN : IF_CHANGE_UP;
 124   if ((i->flags ^ j->flags) & IF_LINK_UP)
 125     c |= IF_CHANGE_LINK;
 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 && (p->proto_state != PS_DOWN))
 142     {
 143       if (p->debug & D_IFACES)
 144         log(L_TRACE "%s < %s address %N on interface %s %s",
 145             p->name, (a->flags & IA_PRIMARY) ? "primary" : "secondary",
 146             &a->prefix, a->iface->name, (c & IF_CHANGE_UP) ? "added" : "removed");
 147       p->ifa_notify(p, c, a);
 148     }
 149 }
 150
 151 static void
 152 ifa_notify_change_(unsigned c, struct ifa *a)
 153 {
 154   struct proto *p;
 155
 156   DBG("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
 157
 158   WALK_LIST(p, proto_list)
 159     ifa_send_notify(p, c, a);
 160 }
 161
 162 static inline void
 163 ifa_notify_change(unsigned c, struct ifa *a)
 164 {
 165   if (c & IF_CHANGE_DOWN)
 166     neigh_ifa_update(a);
 167
 168   ifa_notify_change_(c, a);
 169
 170   if (c & IF_CHANGE_UP)
 171     neigh_ifa_update(a);
 172 }
 173
 174 static inline void
 175 if_send_notify(struct proto *p, unsigned c, struct iface *i)
 176 {
 177   if (p->if_notify && (p->proto_state != PS_DOWN))
 178     {
 179       if (p->debug & D_IFACES)
 180         log(L_TRACE "%s < interface %s %s", p->name, i->name,
 181             (c & IF_CHANGE_UP) ? "goes up" :
 182             (c & IF_CHANGE_DOWN) ? "goes down" :
 183             (c & IF_CHANGE_MTU) ? "changes MTU" :
 184             (c & IF_CHANGE_LINK) ? "changes link" :
 185             (c & IF_CHANGE_CREATE) ? "created" :
 186             "sends unknown event");
 187       p->if_notify(p, c, i);
 188     }
 189 }
 190
 191 static void
 192 if_notify_change(unsigned c, struct iface *i)
 193 {
 194   struct proto *p;
 195   struct ifa *a;
 196
 197   if (i->flags & IF_JUST_CREATED)
 198     {
 199       i->flags &= ~IF_JUST_CREATED;
 200       c |= IF_CHANGE_CREATE | IF_CHANGE_MTU;
 201     }
 202
 203   DBG("Interface change notification (%x) for %s\n", c, i->name);
 204 #ifdef LOCAL_DEBUG
 205   if_dump(i);
 206 #endif
 207
 208   if (c & IF_CHANGE_DOWN)
 209     neigh_if_down(i);
 210
 211   if (c & IF_CHANGE_DOWN)
 212     WALK_LIST(a, i->addrs)
 213       {
 214         a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 215         ifa_notify_change_(IF_CHANGE_DOWN, a);
 216       }
 217
 218   WALK_LIST(p, proto_list)
 219     if_send_notify(p, c, i);
 220
 221   if (c & IF_CHANGE_UP)
 222     WALK_LIST(a, i->addrs)
 223       {
 224         a->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 225         ifa_notify_change_(IF_CHANGE_UP, a);
 226       }
 227
 228   if (c & IF_CHANGE_UP)
 229     neigh_if_up(i);
 230
 231   if ((c & (IF_CHANGE_UP | IF_CHANGE_DOWN | IF_CHANGE_LINK)) == IF_CHANGE_LINK)
 232     neigh_if_link(i);
 233 }
 234
 235 static unsigned
 236 if_recalc_flags(struct iface *i, unsigned flags)
 237 {
 238   if ((flags & (IF_SHUTDOWN | IF_TMP_DOWN)) ||
 239       !(flags & IF_ADMIN_UP) ||
 240       !i->addr)
 241     flags &= ~IF_UP;
 242   else
 243     flags |= IF_UP;
 244   return flags;
 245 }
 246
 247 static void
 248 if_change_flags(struct iface *i, unsigned flags)
 249 {
 250   unsigned of = i->flags;
 251
 252   i->flags = if_recalc_flags(i, flags);
 253   if ((i->flags ^ of) & IF_UP)
 254     if_notify_change((i->flags & IF_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN, i);
 255 }
 256
 257 /**
 258  * if_delete - remove interface
 259  * @old: interface
 260  *
 261  * This function is called by the low-level platform dependent code
 262  * whenever it notices an interface disappears. It is just a shorthand
 263  * for if_update().
 264  */
 265
 266 void
 267 if_delete(struct iface *old)
 268 {
 269   struct iface f = {};
 270   strncpy(f.name, old->name, sizeof(f.name)-1);
 271   f.flags = IF_SHUTDOWN;
 272   if_update(&f);
 273 }
 274
 275 /**
 276  * if_update - update interface status
 277  * @new: new interface status
 278  *
 279  * if_update() is called by the low-level platform dependent code
 280  * whenever it notices an interface change.
 281  *
 282  * There exist two types of interface updates -- synchronous and asynchronous
 283  * ones. In the synchronous case, the low-level code calls if_start_update(),
 284  * scans all interfaces reported by the OS, uses if_update() and ifa_update()
 285  * to pass them to the core and then it finishes the update sequence by
 286  * calling if_end_update(). When working asynchronously, the sysdep code
 287  * calls if_update() and ifa_update() whenever it notices a change.
 288  *
 289  * if_update() will automatically notify all other modules about the change.
 290  */
 291 struct iface *
 292 if_update(struct iface *new)
 293 {
 294   struct iface *i;
 295   unsigned c;
 296
 297   WALK_LIST(i, iface_list)
 298     if (!strcmp(new->name, i->name))
 299       {
 300         new->addr = i->addr;
 301         new->flags = if_recalc_flags(new, new->flags);
 302         c = if_what_changed(i, new);
 303         if (c & IF_CHANGE_TOO_MUCH)     /* Changed a lot, convert it to down/up */
 304           {
 305             DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
 306             if_change_flags(i, i->flags | IF_TMP_DOWN);
 307             rem_node(&i->n);
 308             new->addr = i->addr;
 309             memcpy(&new->addrs, &i->addrs, sizeof(i->addrs));
 310             memcpy(i, new, sizeof(*i));
 311             i->flags &= ~IF_UP; /* IF_TMP_DOWN will be added later */
 312             goto newif;
 313           }
 314
 315         if_copy(i, new);
 316         if (c)
 317           if_notify_change(c, i);
 318
 319         i->flags |= IF_UPDATED;
 320         return i;
 321       }
 322   i = mb_alloc(if_pool, sizeof(struct iface));
 323   memcpy(i, new, sizeof(*i));
 324   init_list(&i->addrs);
 325 newif:
 326   init_list(&i->neighbors);
 327   i->flags |= IF_UPDATED | IF_TMP_DOWN;         /* Tmp down as we don't have addresses yet */
 328   add_tail(&iface_list, &i->n);
 329   return i;
 330 }
 331
 332 void
 333 if_start_update(void)
 334 {
 335   struct iface *i;
 336   struct ifa *a;
 337
 338   WALK_LIST(i, iface_list)
 339     {
 340       i->flags &= ~IF_UPDATED;
 341       WALK_LIST(a, i->addrs)
 342         a->flags &= ~IF_UPDATED;
 343     }
 344 }
 345
 346 void
 347 if_end_partial_update(struct iface *i)
 348 {
 349   if (i->flags & IF_TMP_DOWN)
 350     if_change_flags(i, i->flags & ~IF_TMP_DOWN);
 351 }
 352
 353 void
 354 if_end_update(void)
 355 {
 356   struct iface *i;
 357   struct ifa *a, *b;
 358
 359   WALK_LIST(i, iface_list)
 360     {
 361       if (!(i->flags & IF_UPDATED))
 362         if_change_flags(i, (i->flags & ~IF_ADMIN_UP) | IF_SHUTDOWN);
 363       else
 364         {
 365           WALK_LIST_DELSAFE(a, b, i->addrs)
 366             if (!(a->flags & IF_UPDATED))
 367               ifa_delete(a);
 368           if_end_partial_update(i);
 369         }
 370     }
 371 }
 372
 373 void
 374 if_flush_ifaces(struct proto *p)
 375 {
 376   if (p->debug & D_EVENTS)
 377     log(L_TRACE "%s: Flushing interfaces", p->name);
 378   if_start_update();
 379   if_end_update();
 380 }
 381
 382 /**
 383  * if_feed_baby - advertise interfaces to a new protocol
 384  * @p: protocol to feed
 385  *
 386  * When a new protocol starts, this function sends it a series
 387  * of notifications about all existing interfaces.
 388  */
 389 void
 390 if_feed_baby(struct proto *p)
 391 {
 392   struct iface *i;
 393   struct ifa *a;
 394
 395   if (!p->if_notify && !p->ifa_notify)  /* shortcut */
 396     return;
 397   DBG("Announcing interfaces to new protocol %s\n", p->name);
 398   WALK_LIST(i, iface_list)
 399     {
 400       if_send_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
 401       if (i->flags & IF_UP)
 402         WALK_LIST(a, i->addrs)
 403           ifa_send_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
 404     }
 405 }
 406
 407 /**
 408  * if_find_by_index - find interface by ifindex
 409  * @idx: ifindex
 410  *
 411  * This function finds an &iface structure corresponding to an interface
 412  * of the given index @idx. Returns a pointer to the structure or %NULL
 413  * if no such structure exists.
 414  */
 415 struct iface *
 416 if_find_by_index(unsigned idx)
 417 {
 418   struct iface *i;
 419
 420   WALK_LIST(i, iface_list)
 421     if (i->index == idx && !(i->flags & IF_SHUTDOWN))
 422       return i;
 423   return NULL;
 424 }
 425
 426 /**
 427  * if_find_by_name - find interface by name
 428  * @name: interface name
 429  *
 430  * This function finds an &iface structure corresponding to an interface
 431  * of the given name @name. Returns a pointer to the structure or %NULL
 432  * if no such structure exists.
 433  */
 434 struct iface *
 435 if_find_by_name(char *name)
 436 {
 437   struct iface *i;
 438
 439   WALK_LIST(i, iface_list)
 440     if (!strcmp(i->name, name))
 441       return i;
 442   return NULL;
 443 }
 444
 445 struct iface *
 446 if_get_by_name(char *name)
 447 {
 448   struct iface *i;
 449
 450   if (i = if_find_by_name(name))
 451     return i;
 452
 453   /* No active iface, create a dummy */
 454   i = mb_allocz(if_pool, sizeof(struct iface));
 455   strncpy(i->name, name, sizeof(i->name)-1);
 456   i->flags = IF_SHUTDOWN;
 457   init_list(&i->addrs);
 458   init_list(&i->neighbors);
 459   add_tail(&iface_list, &i->n);
 460   return i;
 461 }
 462
 463 struct ifa *kif_choose_primary(struct iface *i);
 464
 465 static int
 466 ifa_recalc_primary(struct iface *i)
 467 {
 468   struct ifa *a = kif_choose_primary(i);
 469
 470   if (a == i->addr)
 471     return 0;
 472
 473   if (i->addr)
 474     i->addr->flags &= ~IA_PRIMARY;
 475
 476   if (a)
 477     {
 478       a->flags |= IA_PRIMARY;
 479       rem_node(&a->n);
 480       add_head(&i->addrs, &a->n);
 481     }
 482
 483   i->addr = a;
 484   return 1;
 485 }
 486
 487 void
 488 ifa_recalc_all_primary_addresses(void)
 489 {
 490   struct iface *i;
 491
 492   WALK_LIST(i, iface_list)
 493     {
 494       if (ifa_recalc_primary(i))
 495         if_change_flags(i, i->flags | IF_TMP_DOWN);
 496     }
 497 }
 498
 499 static inline int
 500 ifa_same(struct ifa *a, struct ifa *b)
 501 {
 502   return ipa_equal(a->ip, b->ip) && net_equal(&a->prefix, &b->prefix);
 503 }
 504
 505
 506 /**
 507  * ifa_update - update interface address
 508  * @a: new interface address
 509  *
 510  * This function adds address information to a network
 511  * interface. It's called by the platform dependent code during
 512  * the interface update process described under if_update().
 513  */
 514 struct ifa *
 515 ifa_update(struct ifa *a)
 516 {
 517   struct iface *i = a->iface;
 518   struct ifa *b;
 519
 520   WALK_LIST(b, i->addrs)
 521     if (ifa_same(b, a))
 522       {
 523         if (ipa_equal(b->brd, a->brd) &&
 524             ipa_equal(b->opposite, a->opposite) &&
 525             b->scope == a->scope &&
 526             !((b->flags ^ a->flags) & IA_PEER))
 527           {
 528             b->flags |= IF_UPDATED;
 529             return b;
 530           }
 531         ifa_delete(b);
 532         break;
 533       }
 534
 535   if ((a->prefix.type == NET_IP4) && (i->flags & IF_BROADCAST) && ipa_zero(a->brd))
 536     log(L_ERR "Missing broadcast address for interface %s", i->name);
 537
 538   b = mb_alloc(if_pool, sizeof(struct ifa));
 539   memcpy(b, a, sizeof(struct ifa));
 540   add_tail(&i->addrs, &b->n);
 541   b->flags = (i->flags & ~IA_FLAGS) | (a->flags & IA_FLAGS);
 542   if (ifa_recalc_primary(i))
 543     if_change_flags(i, i->flags | IF_TMP_DOWN);
 544   if (b->flags & IF_UP)
 545     ifa_notify_change(IF_CHANGE_CREATE | IF_CHANGE_UP, b);
 546   return b;
 547 }
 548
 549 /**
 550  * ifa_delete - remove interface address
 551  * @a: interface address
 552  *
 553  * This function removes address information from a network
 554  * interface. It's called by the platform dependent code during
 555  * the interface update process described under if_update().
 556  */
 557 void
 558 ifa_delete(struct ifa *a)
 559 {
 560   struct iface *i = a->iface;
 561   struct ifa *b;
 562
 563   WALK_LIST(b, i->addrs)
 564     if (ifa_same(b, a))
 565       {
 566         rem_node(&b->n);
 567         if (b->flags & IF_UP)
 568           {
 569             b->flags &= ~IF_UP;
 570             ifa_notify_change(IF_CHANGE_DOWN, b);
 571           }
 572         if (b->flags & IA_PRIMARY)
 573           {
 574             if_change_flags(i, i->flags | IF_TMP_DOWN);
 575             ifa_recalc_primary(i);
 576           }
 577         mb_free(b);
 578         return;
 579       }
 580 }
 581
 582 u32
 583 if_choose_router_id(struct iface_patt *mask, u32 old_id)
 584 {
 585   struct iface *i;
 586   struct ifa *a, *b;
 587
 588   b = NULL;
 589   WALK_LIST(i, iface_list)
 590     {
 591       if (!(i->flags & IF_ADMIN_UP) ||
 592           (i->flags & IF_SHUTDOWN))
 593         continue;
 594
 595       WALK_LIST(a, i->addrs)
 596         {
 597           if (a->prefix.type != NET_IP4)
 598             continue;
 599
 600           if (a->flags & IA_SECONDARY)
 601             continue;
 602
 603           if (a->scope <= SCOPE_LINK)
 604             continue;
 605
 606           /* Check pattern if specified */
 607           if (mask && !iface_patt_match(mask, i, a))
 608             continue;
 609
 610           /* No pattern or pattern matched */
 611           if (!b || ipa_to_u32(a->ip) < ipa_to_u32(b->ip))
 612             b = a;
 613         }
 614     }
 615
 616   if (!b)
 617     return 0;
 618
 619   u32 id = ipa_to_u32(b->ip);
 620   if (id != old_id)
 621     log(L_INFO "Chosen router ID %R according to interface %s", id, b->iface->name);
 622
 623   return id;
 624 }
 625
 626 /**
 627  * if_init - initialize interface module
 628  *
 629  * This function is called during BIRD startup to initialize
 630  * all data structures of the interface module.
 631  */
 632 void
 633 if_init(void)
 634 {
 635   if_pool = rp_new(&root_pool, "Interfaces");
 636   init_list(&iface_list);
 637   neigh_init(if_pool);
 638 }
 639
 640 /*
 641  *      Interface Pattern Lists
 642  */
 643
 644 int
 645 iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a)
 646 {
 647   struct iface_patt_node *p;
 648
 649   WALK_LIST(p, ifp->ipn_list)
 650     {
 651       char *t = p->pattern;
 652       int pos = p->positive;
 653
 654       if (t)
 655         {
 656           if (*t == '-')
 657             {
 658               t++;
 659               pos = !pos;
 660             }
 661
 662           if (!patmatch(t, i->name))
 663             continue;
 664         }
 665
 666       if (p->prefix.pxlen == 0)
 667         return pos;
 668
 669       if (!a)
 670         continue;
 671
 672       if (ipa_in_netX(a->ip, &p->prefix))
 673         return pos;
 674
 675       if ((a->flags & IA_PEER) &&
 676           ipa_in_netX(a->opposite, &p->prefix))
 677         return pos;
 678
 679       continue;
 680     }
 681
 682   return 0;
 683 }
 684
 685 struct iface_patt *
 686 iface_patt_find(list *l, struct iface *i, struct ifa *a)
 687 {
 688   struct iface_patt *p;
 689
 690   WALK_LIST(p, *l)
 691     if (iface_patt_match(p, i, a))
 692       return p;
 693
 694   return NULL;
 695 }
 696
 697 static int
 698 iface_plists_equal(struct iface_patt *pa, struct iface_patt *pb)
 699 {
 700   struct iface_patt_node *x, *y;
 701
 702   x = HEAD(pa->ipn_list);
 703   y = HEAD(pb->ipn_list);
 704   while (x->n.next && y->n.next)
 705     {
 706       if ((x->positive != y->positive) ||
 707           (!x->pattern && y->pattern) ||        /* This nasty lines where written by me... :-( Feela */
 708           (!y->pattern && x->pattern) ||
 709           ((x->pattern != y->pattern) && strcmp(x->pattern, y->pattern)) ||
 710           !net_equal(&x->prefix, &y->prefix))
 711         return 0;
 712       x = (void *) x->n.next;
 713       y = (void *) y->n.next;
 714     }
 715   return (!x->n.next && !y->n.next);
 716 }
 717
 718 int
 719 iface_patts_equal(list *a, list *b, int (*comp)(struct iface_patt *, struct iface_patt *))
 720 {
 721   struct iface_patt *x, *y;
 722
 723   x = HEAD(*a);
 724   y = HEAD(*b);
 725   while (x->n.next && y->n.next)
 726     {
 727       if (!iface_plists_equal(x, y) ||
 728           (comp && !comp(x, y)))
 729         return 0;
 730       x = (void *) x->n.next;
 731       y = (void *) y->n.next;
 732     }
 733   return (!x->n.next && !y->n.next);
 734 }
 735
 736 /*
 737  *  CLI commands.
 738  */
 739
 740 static void
 741 if_show_addr(struct ifa *a)
 742 {
 743   byte opp[IPA_MAX_TEXT_LENGTH + 16];
 744
 745   if (ipa_nonzero(a->opposite))
 746     bsprintf(opp, ", opposite %I", a->opposite);
 747   else
 748     opp[0] = 0;
 749   cli_msg(-1003, "\t%I/%d (%s%s, scope %s)",
 750           a->ip, a->prefix.pxlen,
 751           (a->flags & IA_PRIMARY) ? "Primary" : (a->flags & IA_SECONDARY) ? "Secondary" : "Unselected",
 752           opp, ip_scope_text(a->scope));
 753 }
 754
 755 void
 756 if_show(void)
 757 {
 758   struct iface *i;
 759   struct ifa *a;
 760   char *type;
 761
 762   WALK_LIST(i, iface_list)
 763     {
 764       if (i->flags & IF_SHUTDOWN)
 765         continue;
 766
 767       cli_msg(-1001, "%s %s (index=%d)", i->name, (i->flags & IF_UP) ? "up" : "DOWN", i->index);
 768       if (!(i->flags & IF_MULTIACCESS))
 769         type = "PtP";
 770       else
 771         type = "MultiAccess";
 772       cli_msg(-1004, "\t%s%s%s Admin%s Link%s%s%s MTU=%d",
 773               type,
 774               (i->flags & IF_BROADCAST) ? " Broadcast" : "",
 775               (i->flags & IF_MULTICAST) ? " Multicast" : "",
 776               (i->flags & IF_ADMIN_UP) ? "Up" : "Down",
 777               (i->flags & IF_LINK_UP) ? "Up" : "Down",
 778               (i->flags & IF_LOOPBACK) ? " Loopback" : "",
 779               (i->flags & IF_IGNORE) ? " Ignored" : "",
 780               i->mtu);
 781       if (i->addr)
 782         if_show_addr(i->addr);
 783       WALK_LIST(a, i->addrs)
 784         if (a != i->addr)
 785           if_show_addr(a);
 786     }
 787   cli_msg(0, "");
 788 }
 789
 790 void
 791 if_show_summary(void)
 792 {
 793   struct iface *i;
 794   byte addr[IPA_MAX_TEXT_LENGTH + 16];
 795
 796   cli_msg(-2005, "interface state address");
 797   WALK_LIST(i, iface_list)
 798     {
 799       if (i->addr)
 800         bsprintf(addr, "%I/%d", i->addr->ip, i->addr->prefix.pxlen);
 801       else
 802         addr[0] = 0;
 803       cli_msg(-1005, "%-9s %-5s %s", i->name, (i->flags & IF_UP) ? "up" : "DOWN", addr);
 804     }
 805   cli_msg(0, "");
 806 }