Annotation of embedaddon/bird2/nest/iface.c, revision 1.1
1.1 ! misho 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: #include "sysdep/unix/krt.h"
! 36:
! 37: static pool *if_pool;
! 38:
! 39: list iface_list;
! 40:
! 41: static void if_recalc_preferred(struct iface *i);
! 42:
! 43: /**
! 44: * ifa_dump - dump interface address
! 45: * @a: interface address descriptor
! 46: *
! 47: * This function dumps contents of an &ifa to the debug output.
! 48: */
! 49: void
! 50: ifa_dump(struct ifa *a)
! 51: {
! 52: debug("\t%I, net %N bc %I -> %I%s%s%s%s\n", a->ip, &a->prefix, a->brd, a->opposite,
! 53: (a->flags & IA_PRIMARY) ? " PRIMARY" : "",
! 54: (a->flags & IA_SECONDARY) ? " SEC" : "",
! 55: (a->flags & IA_HOST) ? " HOST" : "",
! 56: (a->flags & IA_PEER) ? " PEER" : "");
! 57: }
! 58:
! 59: /**
! 60: * if_dump - dump interface
! 61: * @i: interface to dump
! 62: *
! 63: * This function dumps all information associated with a given
! 64: * network interface to the debug output.
! 65: */
! 66: void
! 67: if_dump(struct iface *i)
! 68: {
! 69: struct ifa *a;
! 70:
! 71: debug("IF%d: %s", i->index, i->name);
! 72: if (i->flags & IF_SHUTDOWN)
! 73: debug(" SHUTDOWN");
! 74: if (i->flags & IF_UP)
! 75: debug(" UP");
! 76: else
! 77: debug(" DOWN");
! 78: if (i->flags & IF_ADMIN_UP)
! 79: debug(" LINK-UP");
! 80: if (i->flags & IF_MULTIACCESS)
! 81: debug(" MA");
! 82: if (i->flags & IF_BROADCAST)
! 83: debug(" BC");
! 84: if (i->flags & IF_MULTICAST)
! 85: debug(" MC");
! 86: if (i->flags & IF_LOOPBACK)
! 87: debug(" LOOP");
! 88: if (i->flags & IF_IGNORE)
! 89: debug(" IGN");
! 90: if (i->flags & IF_TMP_DOWN)
! 91: debug(" TDOWN");
! 92: debug(" MTU=%d\n", i->mtu);
! 93: WALK_LIST(a, i->addrs)
! 94: {
! 95: ifa_dump(a);
! 96: ASSERT(!!(a->flags & IA_PRIMARY) ==
! 97: ((a == i->addr4) || (a == i->addr6) || (a == i->llv6)));
! 98: }
! 99: }
! 100:
! 101: /**
! 102: * if_dump_all - dump all interfaces
! 103: *
! 104: * This function dumps information about all known network
! 105: * interfaces to the debug output.
! 106: */
! 107: void
! 108: if_dump_all(void)
! 109: {
! 110: struct iface *i;
! 111:
! 112: debug("Known network interfaces:\n");
! 113: WALK_LIST(i, iface_list)
! 114: if_dump(i);
! 115: debug("Router ID: %08x\n", config->router_id);
! 116: }
! 117:
! 118: static inline unsigned
! 119: if_what_changed(struct iface *i, struct iface *j)
! 120: {
! 121: unsigned c;
! 122:
! 123: if (((i->flags ^ j->flags) & ~(IF_UP | IF_SHUTDOWN | IF_UPDATED | IF_ADMIN_UP | IF_LINK_UP | IF_TMP_DOWN | IF_JUST_CREATED))
! 124: || (i->index != j->index) || (i->master != j->master))
! 125: return IF_CHANGE_TOO_MUCH;
! 126: c = 0;
! 127: if ((i->flags ^ j->flags) & IF_UP)
! 128: c |= (i->flags & IF_UP) ? IF_CHANGE_DOWN : IF_CHANGE_UP;
! 129: if ((i->flags ^ j->flags) & IF_LINK_UP)
! 130: c |= IF_CHANGE_LINK;
! 131: if (i->mtu != j->mtu)
! 132: c |= IF_CHANGE_MTU;
! 133: return c;
! 134: }
! 135:
! 136: static inline void
! 137: if_copy(struct iface *to, struct iface *from)
! 138: {
! 139: to->flags = from->flags | (to->flags & IF_TMP_DOWN);
! 140: to->mtu = from->mtu;
! 141: to->master_index = from->master_index;
! 142: to->master = from->master;
! 143: }
! 144:
! 145: static inline void
! 146: ifa_send_notify(struct proto *p, unsigned c, struct ifa *a)
! 147: {
! 148: if (p->ifa_notify &&
! 149: (p->proto_state != PS_DOWN) &&
! 150: (!p->vrf_set || p->vrf == a->iface->master))
! 151: {
! 152: if (p->debug & D_IFACES)
! 153: log(L_TRACE "%s < address %N on interface %s %s",
! 154: p->name, &a->prefix, a->iface->name,
! 155: (c & IF_CHANGE_UP) ? "added" : "removed");
! 156: p->ifa_notify(p, c, a);
! 157: }
! 158: }
! 159:
! 160: static void
! 161: ifa_notify_change_(unsigned c, struct ifa *a)
! 162: {
! 163: struct proto *p;
! 164:
! 165: DBG("IFA change notification (%x) for %s:%I\n", c, a->iface->name, a->ip);
! 166:
! 167: WALK_LIST(p, proto_list)
! 168: ifa_send_notify(p, c, a);
! 169: }
! 170:
! 171: static inline void
! 172: ifa_notify_change(unsigned c, struct ifa *a)
! 173: {
! 174: if (c & IF_CHANGE_DOWN)
! 175: neigh_ifa_update(a);
! 176:
! 177: ifa_notify_change_(c, a);
! 178:
! 179: if (c & IF_CHANGE_UP)
! 180: neigh_ifa_update(a);
! 181: }
! 182:
! 183: static inline void
! 184: if_send_notify(struct proto *p, unsigned c, struct iface *i)
! 185: {
! 186: if (p->if_notify &&
! 187: (p->proto_state != PS_DOWN) &&
! 188: (!p->vrf_set || p->vrf == i->master))
! 189: {
! 190: if (p->debug & D_IFACES)
! 191: log(L_TRACE "%s < interface %s %s", p->name, i->name,
! 192: (c & IF_CHANGE_UP) ? "goes up" :
! 193: (c & IF_CHANGE_DOWN) ? "goes down" :
! 194: (c & IF_CHANGE_MTU) ? "changes MTU" :
! 195: (c & IF_CHANGE_LINK) ? "changes link" :
! 196: (c & IF_CHANGE_PREFERRED) ? "changes preferred address" :
! 197: (c & IF_CHANGE_CREATE) ? "created" :
! 198: "sends unknown event");
! 199: p->if_notify(p, c, i);
! 200: }
! 201: }
! 202:
! 203: static void
! 204: if_notify_change(unsigned c, struct iface *i)
! 205: {
! 206: struct proto *p;
! 207: struct ifa *a;
! 208:
! 209: if (i->flags & IF_JUST_CREATED)
! 210: {
! 211: i->flags &= ~IF_JUST_CREATED;
! 212: c |= IF_CHANGE_CREATE | IF_CHANGE_MTU;
! 213: }
! 214:
! 215: DBG("Interface change notification (%x) for %s\n", c, i->name);
! 216: #ifdef LOCAL_DEBUG
! 217: if_dump(i);
! 218: #endif
! 219:
! 220: if (c & IF_CHANGE_DOWN)
! 221: neigh_if_down(i);
! 222:
! 223: if (c & IF_CHANGE_DOWN)
! 224: WALK_LIST(a, i->addrs)
! 225: ifa_notify_change_(IF_CHANGE_DOWN, a);
! 226:
! 227: WALK_LIST(p, proto_list)
! 228: if_send_notify(p, c, i);
! 229:
! 230: if (c & IF_CHANGE_UP)
! 231: WALK_LIST(a, i->addrs)
! 232: ifa_notify_change_(IF_CHANGE_UP, a);
! 233:
! 234: if (c & IF_CHANGE_UP)
! 235: neigh_if_up(i);
! 236:
! 237: if ((c & (IF_CHANGE_UP | IF_CHANGE_DOWN | IF_CHANGE_LINK)) == IF_CHANGE_LINK)
! 238: neigh_if_link(i);
! 239: }
! 240:
! 241: static uint
! 242: if_recalc_flags(struct iface *i UNUSED, uint flags)
! 243: {
! 244: if ((flags & IF_ADMIN_UP) &&
! 245: !(flags & (IF_SHUTDOWN | IF_TMP_DOWN)) &&
! 246: !(i->master_index && !i->master))
! 247: flags |= IF_UP;
! 248: else
! 249: flags &= ~IF_UP;
! 250:
! 251: return flags;
! 252: }
! 253:
! 254: static void
! 255: if_change_flags(struct iface *i, uint flags)
! 256: {
! 257: uint of = i->flags;
! 258: i->flags = if_recalc_flags(i, flags);
! 259:
! 260: if ((i->flags ^ of) & IF_UP)
! 261: if_notify_change((i->flags & IF_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN, i);
! 262: }
! 263:
! 264: /**
! 265: * if_delete - remove interface
! 266: * @old: interface
! 267: *
! 268: * This function is called by the low-level platform dependent code
! 269: * whenever it notices an interface disappears. It is just a shorthand
! 270: * for if_update().
! 271: */
! 272:
! 273: void
! 274: if_delete(struct iface *old)
! 275: {
! 276: struct iface f = {};
! 277: strncpy(f.name, old->name, sizeof(f.name)-1);
! 278: f.flags = IF_SHUTDOWN;
! 279: if_update(&f);
! 280: }
! 281:
! 282: /**
! 283: * if_update - update interface status
! 284: * @new: new interface status
! 285: *
! 286: * if_update() is called by the low-level platform dependent code
! 287: * whenever it notices an interface change.
! 288: *
! 289: * There exist two types of interface updates -- synchronous and asynchronous
! 290: * ones. In the synchronous case, the low-level code calls if_start_update(),
! 291: * scans all interfaces reported by the OS, uses if_update() and ifa_update()
! 292: * to pass them to the core and then it finishes the update sequence by
! 293: * calling if_end_update(). When working asynchronously, the sysdep code
! 294: * calls if_update() and ifa_update() whenever it notices a change.
! 295: *
! 296: * if_update() will automatically notify all other modules about the change.
! 297: */
! 298: struct iface *
! 299: if_update(struct iface *new)
! 300: {
! 301: struct iface *i;
! 302: unsigned c;
! 303:
! 304: WALK_LIST(i, iface_list)
! 305: if (!strcmp(new->name, i->name))
! 306: {
! 307: new->flags = if_recalc_flags(new, new->flags);
! 308: c = if_what_changed(i, new);
! 309: if (c & IF_CHANGE_TOO_MUCH) /* Changed a lot, convert it to down/up */
! 310: {
! 311: DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
! 312: if_change_flags(i, i->flags | IF_TMP_DOWN);
! 313: rem_node(&i->n);
! 314: new->addr4 = i->addr4;
! 315: new->addr6 = i->addr6;
! 316: new->llv6 = i->llv6;
! 317: new->sysdep = i->sysdep;
! 318: memcpy(&new->addrs, &i->addrs, sizeof(i->addrs));
! 319: memcpy(i, new, sizeof(*i));
! 320: i->flags &= ~IF_UP; /* IF_TMP_DOWN will be added later */
! 321: goto newif;
! 322: }
! 323:
! 324: if_copy(i, new);
! 325: if (c)
! 326: if_notify_change(c, i);
! 327:
! 328: i->flags |= IF_UPDATED;
! 329: return i;
! 330: }
! 331: i = mb_alloc(if_pool, sizeof(struct iface));
! 332: memcpy(i, new, sizeof(*i));
! 333: init_list(&i->addrs);
! 334: newif:
! 335: init_list(&i->neighbors);
! 336: i->flags |= IF_UPDATED | IF_TMP_DOWN; /* Tmp down as we don't have addresses yet */
! 337: add_tail(&iface_list, &i->n);
! 338: return i;
! 339: }
! 340:
! 341: void
! 342: if_start_update(void)
! 343: {
! 344: struct iface *i;
! 345: struct ifa *a;
! 346:
! 347: WALK_LIST(i, iface_list)
! 348: {
! 349: i->flags &= ~IF_UPDATED;
! 350: WALK_LIST(a, i->addrs)
! 351: a->flags &= ~IA_UPDATED;
! 352: }
! 353: }
! 354:
! 355: void
! 356: if_end_partial_update(struct iface *i)
! 357: {
! 358: if (i->flags & IF_NEEDS_RECALC)
! 359: if_recalc_preferred(i);
! 360:
! 361: if (i->flags & IF_TMP_DOWN)
! 362: if_change_flags(i, i->flags & ~IF_TMP_DOWN);
! 363: }
! 364:
! 365: void
! 366: if_end_update(void)
! 367: {
! 368: struct iface *i;
! 369: struct ifa *a, *b;
! 370:
! 371: WALK_LIST(i, iface_list)
! 372: {
! 373: if (!(i->flags & IF_UPDATED))
! 374: if_change_flags(i, (i->flags & ~IF_ADMIN_UP) | IF_SHUTDOWN);
! 375: else
! 376: {
! 377: WALK_LIST_DELSAFE(a, b, i->addrs)
! 378: if (!(a->flags & IA_UPDATED))
! 379: ifa_delete(a);
! 380: if_end_partial_update(i);
! 381: }
! 382: }
! 383: }
! 384:
! 385: void
! 386: if_flush_ifaces(struct proto *p)
! 387: {
! 388: if (p->debug & D_EVENTS)
! 389: log(L_TRACE "%s: Flushing interfaces", p->name);
! 390: if_start_update();
! 391: if_end_update();
! 392: }
! 393:
! 394: /**
! 395: * if_feed_baby - advertise interfaces to a new protocol
! 396: * @p: protocol to feed
! 397: *
! 398: * When a new protocol starts, this function sends it a series
! 399: * of notifications about all existing interfaces.
! 400: */
! 401: void
! 402: if_feed_baby(struct proto *p)
! 403: {
! 404: struct iface *i;
! 405: struct ifa *a;
! 406:
! 407: if (!p->if_notify && !p->ifa_notify) /* shortcut */
! 408: return;
! 409: DBG("Announcing interfaces to new protocol %s\n", p->name);
! 410: WALK_LIST(i, iface_list)
! 411: {
! 412: if_send_notify(p, IF_CHANGE_CREATE | ((i->flags & IF_UP) ? IF_CHANGE_UP : 0), i);
! 413: if (i->flags & IF_UP)
! 414: WALK_LIST(a, i->addrs)
! 415: ifa_send_notify(p, IF_CHANGE_CREATE | IF_CHANGE_UP, a);
! 416: }
! 417: }
! 418:
! 419: /**
! 420: * if_find_by_index - find interface by ifindex
! 421: * @idx: ifindex
! 422: *
! 423: * This function finds an &iface structure corresponding to an interface
! 424: * of the given index @idx. Returns a pointer to the structure or %NULL
! 425: * if no such structure exists.
! 426: */
! 427: struct iface *
! 428: if_find_by_index(unsigned idx)
! 429: {
! 430: struct iface *i;
! 431:
! 432: WALK_LIST(i, iface_list)
! 433: if (i->index == idx && !(i->flags & IF_SHUTDOWN))
! 434: return i;
! 435: return NULL;
! 436: }
! 437:
! 438: /**
! 439: * if_find_by_name - find interface by name
! 440: * @name: interface name
! 441: *
! 442: * This function finds an &iface structure corresponding to an interface
! 443: * of the given name @name. Returns a pointer to the structure or %NULL
! 444: * if no such structure exists.
! 445: */
! 446: struct iface *
! 447: if_find_by_name(char *name)
! 448: {
! 449: struct iface *i;
! 450:
! 451: WALK_LIST(i, iface_list)
! 452: if (!strcmp(i->name, name) && !(i->flags & IF_SHUTDOWN))
! 453: return i;
! 454: return NULL;
! 455: }
! 456:
! 457: struct iface *
! 458: if_get_by_name(char *name)
! 459: {
! 460: struct iface *i;
! 461:
! 462: WALK_LIST(i, iface_list)
! 463: if (!strcmp(i->name, name))
! 464: return i;
! 465:
! 466: /* No active iface, create a dummy */
! 467: i = mb_allocz(if_pool, sizeof(struct iface));
! 468: strncpy(i->name, name, sizeof(i->name)-1);
! 469: i->flags = IF_SHUTDOWN;
! 470: init_list(&i->addrs);
! 471: init_list(&i->neighbors);
! 472: add_tail(&iface_list, &i->n);
! 473: return i;
! 474: }
! 475:
! 476: static inline void
! 477: if_set_preferred(struct ifa **pos, struct ifa *new)
! 478: {
! 479: if (*pos)
! 480: (*pos)->flags &= ~IA_PRIMARY;
! 481: if (new)
! 482: new->flags |= IA_PRIMARY;
! 483:
! 484: *pos = new;
! 485: }
! 486:
! 487: static void
! 488: if_recalc_preferred(struct iface *i)
! 489: {
! 490: /*
! 491: * Preferred address selection priority:
! 492: * 1) Address configured in Device protocol
! 493: * 2) Sysdep IPv4 address (BSD)
! 494: * 3) Old preferred address
! 495: * 4) First address in list
! 496: */
! 497:
! 498: struct kif_iface_config *ic = kif_get_iface_config(i);
! 499: struct ifa *a4 = i->addr4, *a6 = i->addr6, *ll = i->llv6;
! 500: ip_addr pref_v4 = ic->pref_v4;
! 501: uint change = 0;
! 502:
! 503: if (kif_update_sysdep_addr(i))
! 504: change |= IF_CHANGE_SYSDEP;
! 505:
! 506: /* BSD sysdep address */
! 507: if (ipa_zero(pref_v4) && ip4_nonzero(i->sysdep))
! 508: pref_v4 = ipa_from_ip4(i->sysdep);
! 509:
! 510: struct ifa *a;
! 511: WALK_LIST(a, i->addrs)
! 512: {
! 513: /* Secondary address is never selected */
! 514: if (a->flags & IA_SECONDARY)
! 515: continue;
! 516:
! 517: if (ipa_is_ip4(a->ip)) {
! 518: if (!a4 || ipa_equal(a->ip, pref_v4))
! 519: a4 = a;
! 520: } else if (!ipa_is_link_local(a->ip)) {
! 521: if (!a6 || ipa_equal(a->ip, ic->pref_v6))
! 522: a6 = a;
! 523: } else {
! 524: if (!ll || ipa_equal(a->ip, ic->pref_ll))
! 525: ll = a;
! 526: }
! 527: }
! 528:
! 529: if ((a4 != i->addr4) || (i->flags & IF_LOST_ADDR4))
! 530: {
! 531: if_set_preferred(&i->addr4, a4);
! 532: change |= IF_CHANGE_ADDR4;
! 533: }
! 534:
! 535: if ((a6 != i->addr6) || (i->flags & IF_LOST_ADDR6))
! 536: {
! 537: if_set_preferred(&i->addr6, a6);
! 538: change |= IF_CHANGE_ADDR6;
! 539: }
! 540:
! 541: if ((ll != i->llv6) || (i->flags & IF_LOST_LLV6))
! 542: {
! 543: if_set_preferred(&i->llv6, ll);
! 544: change |= IF_CHANGE_LLV6;
! 545: }
! 546:
! 547: i->flags &= ~(IF_NEEDS_RECALC | IF_LOST_ADDR4 | IF_LOST_ADDR6 | IF_LOST_LLV6);
! 548:
! 549: if (change)
! 550: if_notify_change(change, i);
! 551: }
! 552:
! 553: void
! 554: if_recalc_all_preferred_addresses(void)
! 555: {
! 556: struct iface *i;
! 557:
! 558: WALK_LIST(i, iface_list)
! 559: {
! 560: if_recalc_preferred(i);
! 561:
! 562: if (i->flags & IF_TMP_DOWN)
! 563: if_change_flags(i, i->flags & ~IF_TMP_DOWN);
! 564: }
! 565: }
! 566:
! 567: static inline int
! 568: ifa_same(struct ifa *a, struct ifa *b)
! 569: {
! 570: return ipa_equal(a->ip, b->ip) && net_equal(&a->prefix, &b->prefix);
! 571: }
! 572:
! 573:
! 574: /**
! 575: * ifa_update - update interface address
! 576: * @a: new interface address
! 577: *
! 578: * This function adds address information to a network
! 579: * interface. It's called by the platform dependent code during
! 580: * the interface update process described under if_update().
! 581: */
! 582: struct ifa *
! 583: ifa_update(struct ifa *a)
! 584: {
! 585: struct iface *i = a->iface;
! 586: struct ifa *b;
! 587:
! 588: WALK_LIST(b, i->addrs)
! 589: if (ifa_same(b, a))
! 590: {
! 591: if (ipa_equal(b->brd, a->brd) &&
! 592: ipa_equal(b->opposite, a->opposite) &&
! 593: b->scope == a->scope &&
! 594: !((b->flags ^ a->flags) & IA_PEER))
! 595: {
! 596: b->flags |= IA_UPDATED;
! 597: return b;
! 598: }
! 599: ifa_delete(b);
! 600: break;
! 601: }
! 602:
! 603: if ((a->prefix.type == NET_IP4) && (i->flags & IF_BROADCAST) && ipa_zero(a->brd))
! 604: log(L_WARN "Missing broadcast address for interface %s", i->name);
! 605:
! 606: b = mb_alloc(if_pool, sizeof(struct ifa));
! 607: memcpy(b, a, sizeof(struct ifa));
! 608: add_tail(&i->addrs, &b->n);
! 609: b->flags |= IA_UPDATED;
! 610:
! 611: i->flags |= IF_NEEDS_RECALC;
! 612: if (i->flags & IF_UP)
! 613: ifa_notify_change(IF_CHANGE_CREATE | IF_CHANGE_UP, b);
! 614: return b;
! 615: }
! 616:
! 617: /**
! 618: * ifa_delete - remove interface address
! 619: * @a: interface address
! 620: *
! 621: * This function removes address information from a network
! 622: * interface. It's called by the platform dependent code during
! 623: * the interface update process described under if_update().
! 624: */
! 625: void
! 626: ifa_delete(struct ifa *a)
! 627: {
! 628: struct iface *i = a->iface;
! 629: struct ifa *b;
! 630:
! 631: WALK_LIST(b, i->addrs)
! 632: if (ifa_same(b, a))
! 633: {
! 634: rem_node(&b->n);
! 635:
! 636: if (b->flags & IA_PRIMARY)
! 637: {
! 638: /*
! 639: * We unlink deleted preferred address and mark for recalculation.
! 640: * FIXME: This could break if we make iface scan non-atomic, as
! 641: * protocols still could use the freed address until they get
! 642: * if_notify from preferred route recalculation. We should fix and
! 643: * simplify this in the future by having struct ifa refcounted
! 644: */
! 645: if (b == i->addr4) { i->addr4 = NULL; i->flags |= IF_LOST_ADDR4; }
! 646: if (b == i->addr6) { i->addr6 = NULL; i->flags |= IF_LOST_ADDR6; }
! 647: if (b == i->llv6) { i->llv6 = NULL; i->flags |= IF_LOST_LLV6; }
! 648: i->flags |= IF_NEEDS_RECALC;
! 649: }
! 650:
! 651: if (i->flags & IF_UP)
! 652: ifa_notify_change(IF_CHANGE_DOWN, b);
! 653:
! 654: mb_free(b);
! 655: return;
! 656: }
! 657: }
! 658:
! 659: u32
! 660: if_choose_router_id(struct iface_patt *mask, u32 old_id)
! 661: {
! 662: struct iface *i;
! 663: struct ifa *a, *b;
! 664:
! 665: b = NULL;
! 666: WALK_LIST(i, iface_list)
! 667: {
! 668: if (!(i->flags & IF_ADMIN_UP) ||
! 669: (i->flags & IF_SHUTDOWN))
! 670: continue;
! 671:
! 672: WALK_LIST(a, i->addrs)
! 673: {
! 674: if (a->prefix.type != NET_IP4)
! 675: continue;
! 676:
! 677: if (a->flags & IA_SECONDARY)
! 678: continue;
! 679:
! 680: if (a->scope <= SCOPE_LINK)
! 681: continue;
! 682:
! 683: /* Check pattern if specified */
! 684: if (mask && !iface_patt_match(mask, i, a))
! 685: continue;
! 686:
! 687: /* No pattern or pattern matched */
! 688: if (!b || ipa_to_u32(a->ip) < ipa_to_u32(b->ip))
! 689: b = a;
! 690: }
! 691: }
! 692:
! 693: if (!b)
! 694: return 0;
! 695:
! 696: u32 id = ipa_to_u32(b->ip);
! 697: if (id != old_id)
! 698: log(L_INFO "Chosen router ID %R according to interface %s", id, b->iface->name);
! 699:
! 700: return id;
! 701: }
! 702:
! 703: /**
! 704: * if_init - initialize interface module
! 705: *
! 706: * This function is called during BIRD startup to initialize
! 707: * all data structures of the interface module.
! 708: */
! 709: void
! 710: if_init(void)
! 711: {
! 712: if_pool = rp_new(&root_pool, "Interfaces");
! 713: init_list(&iface_list);
! 714: neigh_init(if_pool);
! 715: }
! 716:
! 717: /*
! 718: * Interface Pattern Lists
! 719: */
! 720:
! 721: int
! 722: iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a)
! 723: {
! 724: struct iface_patt_node *p;
! 725:
! 726: WALK_LIST(p, ifp->ipn_list)
! 727: {
! 728: char *t = p->pattern;
! 729: int pos = p->positive;
! 730:
! 731: if (t)
! 732: {
! 733: if (*t == '-')
! 734: {
! 735: t++;
! 736: pos = !pos;
! 737: }
! 738:
! 739: if (!patmatch(t, i->name))
! 740: continue;
! 741: }
! 742:
! 743: if (p->prefix.pxlen == 0)
! 744: return pos;
! 745:
! 746: if (!a)
! 747: continue;
! 748:
! 749: if (ipa_in_netX(a->ip, &p->prefix))
! 750: return pos;
! 751:
! 752: if ((a->flags & IA_PEER) &&
! 753: ipa_in_netX(a->opposite, &p->prefix))
! 754: return pos;
! 755:
! 756: continue;
! 757: }
! 758:
! 759: return 0;
! 760: }
! 761:
! 762: struct iface_patt *
! 763: iface_patt_find(list *l, struct iface *i, struct ifa *a)
! 764: {
! 765: struct iface_patt *p;
! 766:
! 767: WALK_LIST(p, *l)
! 768: if (iface_patt_match(p, i, a))
! 769: return p;
! 770:
! 771: return NULL;
! 772: }
! 773:
! 774: static int
! 775: iface_plists_equal(struct iface_patt *pa, struct iface_patt *pb)
! 776: {
! 777: struct iface_patt_node *x, *y;
! 778:
! 779: x = HEAD(pa->ipn_list);
! 780: y = HEAD(pb->ipn_list);
! 781: while (x->n.next && y->n.next)
! 782: {
! 783: if ((x->positive != y->positive) ||
! 784: (!x->pattern && y->pattern) || /* This nasty lines where written by me... :-( Feela */
! 785: (!y->pattern && x->pattern) ||
! 786: ((x->pattern != y->pattern) && strcmp(x->pattern, y->pattern)) ||
! 787: !net_equal(&x->prefix, &y->prefix))
! 788: return 0;
! 789: x = (void *) x->n.next;
! 790: y = (void *) y->n.next;
! 791: }
! 792: return (!x->n.next && !y->n.next);
! 793: }
! 794:
! 795: int
! 796: iface_patts_equal(list *a, list *b, int (*comp)(struct iface_patt *, struct iface_patt *))
! 797: {
! 798: struct iface_patt *x, *y;
! 799:
! 800: x = HEAD(*a);
! 801: y = HEAD(*b);
! 802: while (x->n.next && y->n.next)
! 803: {
! 804: if (!iface_plists_equal(x, y) ||
! 805: (comp && !comp(x, y)))
! 806: return 0;
! 807: x = (void *) x->n.next;
! 808: y = (void *) y->n.next;
! 809: }
! 810: return (!x->n.next && !y->n.next);
! 811: }
! 812:
! 813: /*
! 814: * CLI commands.
! 815: */
! 816:
! 817: static void
! 818: if_show_addr(struct ifa *a)
! 819: {
! 820: byte *flg, opp[IPA_MAX_TEXT_LENGTH + 16];
! 821:
! 822: flg = (a->flags & IA_PRIMARY) ? "Preferred, " : (a->flags & IA_SECONDARY) ? "Secondary, " : "";
! 823:
! 824: if (ipa_nonzero(a->opposite))
! 825: bsprintf(opp, "opposite %I, ", a->opposite);
! 826: else
! 827: opp[0] = 0;
! 828:
! 829: cli_msg(-1003, "\t%I/%d (%s%sscope %s)",
! 830: a->ip, a->prefix.pxlen, flg, opp, ip_scope_text(a->scope));
! 831: }
! 832:
! 833: void
! 834: if_show(void)
! 835: {
! 836: struct iface *i;
! 837: struct ifa *a;
! 838: char *type;
! 839:
! 840: WALK_LIST(i, iface_list)
! 841: {
! 842: if (i->flags & IF_SHUTDOWN)
! 843: continue;
! 844:
! 845: char mbuf[16 + sizeof(i->name)] = {};
! 846: if (i->master)
! 847: bsprintf(mbuf, " master=%s", i->master->name);
! 848: else if (i->master_index)
! 849: bsprintf(mbuf, " master=#%u", i->master_index);
! 850:
! 851: cli_msg(-1001, "%s %s (index=%d%s)", i->name, (i->flags & IF_UP) ? "up" : "down", i->index, mbuf);
! 852: if (!(i->flags & IF_MULTIACCESS))
! 853: type = "PtP";
! 854: else
! 855: type = "MultiAccess";
! 856: cli_msg(-1004, "\t%s%s%s Admin%s Link%s%s%s MTU=%d",
! 857: type,
! 858: (i->flags & IF_BROADCAST) ? " Broadcast" : "",
! 859: (i->flags & IF_MULTICAST) ? " Multicast" : "",
! 860: (i->flags & IF_ADMIN_UP) ? "Up" : "Down",
! 861: (i->flags & IF_LINK_UP) ? "Up" : "Down",
! 862: (i->flags & IF_LOOPBACK) ? " Loopback" : "",
! 863: (i->flags & IF_IGNORE) ? " Ignored" : "",
! 864: i->mtu);
! 865:
! 866: WALK_LIST(a, i->addrs)
! 867: if (a->prefix.type == NET_IP4)
! 868: if_show_addr(a);
! 869:
! 870: WALK_LIST(a, i->addrs)
! 871: if (a->prefix.type == NET_IP6)
! 872: if_show_addr(a);
! 873: }
! 874: cli_msg(0, "");
! 875: }
! 876:
! 877: void
! 878: if_show_summary(void)
! 879: {
! 880: struct iface *i;
! 881:
! 882: cli_msg(-2005, "%-10s %-6s %-18s %s", "Interface", "State", "IPv4 address", "IPv6 address");
! 883: WALK_LIST(i, iface_list)
! 884: {
! 885: byte a4[IPA_MAX_TEXT_LENGTH + 17];
! 886: byte a6[IPA_MAX_TEXT_LENGTH + 17];
! 887:
! 888: if (i->flags & IF_SHUTDOWN)
! 889: continue;
! 890:
! 891: if (i->addr4)
! 892: bsprintf(a4, "%I/%d", i->addr4->ip, i->addr4->prefix.pxlen);
! 893: else
! 894: a4[0] = 0;
! 895:
! 896: if (i->addr6)
! 897: bsprintf(a6, "%I/%d", i->addr6->ip, i->addr6->prefix.pxlen);
! 898: else
! 899: a6[0] = 0;
! 900:
! 901: cli_msg(-1005, "%-10s %-6s %-18s %s",
! 902: i->name, (i->flags & IF_UP) ? "up" : "down", a4, a6);
! 903: }
! 904: cli_msg(0, "");
! 905: }
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