ripngd/ripng_interface.c

   1 /*
   2  * Interface related function for RIPng.
   3  * Copyright (C) 1998 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "linklist.h"
  25 #include "if.h"
  26 #include "prefix.h"
  27 #include "memory.h"
  28 #include "network.h"
  29 #include "filter.h"
  30 #include "log.h"
  31 #include "stream.h"
  32 #include "zclient.h"
  33 #include "command.h"
  34 #include "agg_table.h"
  35 #include "thread.h"
  36 #include "privs.h"
  37 #include "vrf.h"
  38 #include "lib_errors.h"
  39
  40 #include "ripngd/ripngd.h"
  41 #include "ripngd/ripng_debug.h"
  42
  43 /* If RFC2133 definition is used. */
  44 #ifndef IPV6_JOIN_GROUP
  45 #define IPV6_JOIN_GROUP  IPV6_ADD_MEMBERSHIP
  46 #endif
  47 #ifndef IPV6_LEAVE_GROUP
  48 #define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP
  49 #endif
  50
  51 /* Static utility function. */
  52 static void ripng_enable_apply(struct interface *);
  53 static void ripng_passive_interface_apply(struct interface *);
  54 static int ripng_enable_if_lookup(const char *);
  55 static int ripng_enable_network_lookup2(struct connected *);
  56 static void ripng_enable_apply_all(void);
  57
  58 /* Join to the all rip routers multicast group. */
  59 static int ripng_multicast_join(struct interface *ifp)
  60 {
  61         int ret;
  62         struct ipv6_mreq mreq;
  63         int save_errno;
  64
  65         if (if_is_multicast(ifp)) {
  66                 memset(&mreq, 0, sizeof(mreq));
  67                 inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
  68                 mreq.ipv6mr_interface = ifp->ifindex;
  69
  70                 /*
  71                  * NetBSD 1.6.2 requires root to join groups on gif(4).
  72                  * While this is bogus, privs are available and easy to use
  73                  * for this call as a workaround.
  74                  */
  75                 frr_elevate_privs(&ripngd_privs) {
  76
  77                         ret = setsockopt(ripng->sock, IPPROTO_IPV6,
  78                                          IPV6_JOIN_GROUP,
  79                                          (char *)&mreq, sizeof(mreq));
  80                         save_errno = errno;
  81
  82                 }
  83
  84                 if (ret < 0 && save_errno == EADDRINUSE) {
  85                         /*
  86                          * Group is already joined.  This occurs due to sloppy
  87                          * group
  88                          * management, in particular declining to leave the
  89                          * group on
  90                          * an interface that has just gone down.
  91                          */
  92                         zlog_warn("ripng join on %s EADDRINUSE (ignoring)\n",
  93                                   ifp->name);
  94                         return 0; /* not an error */
  95                 }
  96
  97                 if (ret < 0)
  98                         zlog_warn("can't setsockopt IPV6_JOIN_GROUP: %s",
  99                                   safe_strerror(save_errno));
 100
 101                 if (IS_RIPNG_DEBUG_EVENT)
 102                         zlog_debug(
 103                                 "RIPng %s join to all-rip-routers multicast group",
 104                                 ifp->name);
 105
 106                 if (ret < 0)
 107                         return -1;
 108         }
 109         return 0;
 110 }
 111
 112 /* Leave from the all rip routers multicast group. */
 113 static int ripng_multicast_leave(struct interface *ifp)
 114 {
 115         int ret;
 116         struct ipv6_mreq mreq;
 117
 118         if (if_is_multicast(ifp)) {
 119                 memset(&mreq, 0, sizeof(mreq));
 120                 inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
 121                 mreq.ipv6mr_interface = ifp->ifindex;
 122
 123                 ret = setsockopt(ripng->sock, IPPROTO_IPV6, IPV6_LEAVE_GROUP,
 124                                  (char *)&mreq, sizeof(mreq));
 125                 if (ret < 0)
 126                         zlog_warn("can't setsockopt IPV6_LEAVE_GROUP: %s\n",
 127                                   safe_strerror(errno));
 128
 129                 if (IS_RIPNG_DEBUG_EVENT)
 130                         zlog_debug(
 131                                 "RIPng %s leave from all-rip-routers multicast group",
 132                                 ifp->name);
 133
 134                 if (ret < 0)
 135                         return -1;
 136         }
 137
 138         return 0;
 139 }
 140
 141 /* How many link local IPv6 address could be used on the interface ? */
 142 static int ripng_if_ipv6_lladdress_check(struct interface *ifp)
 143 {
 144         struct listnode *nn;
 145         struct connected *connected;
 146         int count = 0;
 147
 148         for (ALL_LIST_ELEMENTS_RO(ifp->connected, nn, connected)) {
 149                 struct prefix *p;
 150                 p = connected->address;
 151
 152                 if ((p->family == AF_INET6)
 153                     && IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6))
 154                         count++;
 155         }
 156
 157         return count;
 158 }
 159
 160 static int ripng_if_down(struct interface *ifp)
 161 {
 162         struct agg_node *rp;
 163         struct ripng_info *rinfo;
 164         struct ripng_interface *ri;
 165         struct list *list = NULL;
 166         struct listnode *listnode = NULL, *nextnode = NULL;
 167
 168         if (ripng)
 169                 for (rp = agg_route_top(ripng->table); rp;
 170                      rp = agg_route_next(rp))
 171                         if ((list = rp->info) != NULL)
 172                                 for (ALL_LIST_ELEMENTS(list, listnode, nextnode,
 173                                                        rinfo))
 174                                         if (rinfo->ifindex == ifp->ifindex)
 175                                                 ripng_ecmp_delete(rinfo);
 176
 177         ri = ifp->info;
 178
 179         if (ri->running) {
 180                 if (IS_RIPNG_DEBUG_EVENT)
 181                         zlog_debug("turn off %s", ifp->name);
 182
 183                 /* Leave from multicast group. */
 184                 ripng_multicast_leave(ifp);
 185
 186                 ri->running = 0;
 187         }
 188
 189         return 0;
 190 }
 191
 192 /* Inteface link up message processing. */
 193 int ripng_interface_up(int command, struct zclient *zclient,
 194                        zebra_size_t length, vrf_id_t vrf_id)
 195 {
 196         struct stream *s;
 197         struct interface *ifp;
 198
 199         /* zebra_interface_state_read() updates interface structure in iflist.
 200          */
 201         s = zclient->ibuf;
 202         ifp = zebra_interface_state_read(s, vrf_id);
 203
 204         if (ifp == NULL)
 205                 return 0;
 206
 207         if (IS_RIPNG_DEBUG_ZEBRA)
 208                 zlog_debug(
 209                         "interface up %s index %d flags %llx metric %d mtu %d",
 210                         ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 211                         ifp->metric, ifp->mtu6);
 212
 213         /* Check if this interface is RIPng enabled or not. */
 214         ripng_enable_apply(ifp);
 215
 216         /* Check for a passive interface. */
 217         ripng_passive_interface_apply(ifp);
 218
 219         /* Apply distribute list to the all interface. */
 220         ripng_distribute_update_interface(ifp);
 221
 222         return 0;
 223 }
 224
 225 /* Inteface link down message processing. */
 226 int ripng_interface_down(int command, struct zclient *zclient,
 227                          zebra_size_t length, vrf_id_t vrf_id)
 228 {
 229         struct stream *s;
 230         struct interface *ifp;
 231
 232         /* zebra_interface_state_read() updates interface structure in iflist.
 233          */
 234         s = zclient->ibuf;
 235         ifp = zebra_interface_state_read(s, vrf_id);
 236
 237         if (ifp == NULL)
 238                 return 0;
 239
 240         ripng_if_down(ifp);
 241
 242         if (IS_RIPNG_DEBUG_ZEBRA)
 243                 zlog_debug(
 244                         "interface down %s index %d flags %#llx metric %d mtu %d",
 245                         ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 246                         ifp->metric, ifp->mtu6);
 247
 248         return 0;
 249 }
 250
 251 /* Inteface addition message from zebra. */
 252 int ripng_interface_add(int command, struct zclient *zclient,
 253                         zebra_size_t length, vrf_id_t vrf_id)
 254 {
 255         struct interface *ifp;
 256
 257         ifp = zebra_interface_add_read(zclient->ibuf, vrf_id);
 258
 259         if (IS_RIPNG_DEBUG_ZEBRA)
 260                 zlog_debug(
 261                         "RIPng interface add %s index %d flags %#llx metric %d mtu %d",
 262                         ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 263                         ifp->metric, ifp->mtu6);
 264
 265         /* Check is this interface is RIP enabled or not.*/
 266         ripng_enable_apply(ifp);
 267
 268         /* Apply distribute list to the interface. */
 269         ripng_distribute_update_interface(ifp);
 270
 271         /* Check interface routemap. */
 272         ripng_if_rmap_update_interface(ifp);
 273
 274         return 0;
 275 }
 276
 277 int ripng_interface_delete(int command, struct zclient *zclient,
 278                            zebra_size_t length, vrf_id_t vrf_id)
 279 {
 280         struct interface *ifp;
 281         struct stream *s;
 282
 283         s = zclient->ibuf;
 284         /*  zebra_interface_state_read() updates interface structure in iflist
 285          */
 286         ifp = zebra_interface_state_read(s, vrf_id);
 287
 288         if (ifp == NULL)
 289                 return 0;
 290
 291         if (if_is_up(ifp)) {
 292                 ripng_if_down(ifp);
 293         }
 294
 295         zlog_info("interface delete %s index %d flags %#llx metric %d mtu %d",
 296                   ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 297                   ifp->metric, ifp->mtu6);
 298
 299         /* To support pseudo interface do not free interface structure.  */
 300         /* if_delete(ifp); */
 301         if_set_index(ifp, IFINDEX_INTERNAL);
 302
 303         return 0;
 304 }
 305
 306 void ripng_interface_clean(void)
 307 {
 308         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 309         struct interface *ifp;
 310         struct ripng_interface *ri;
 311
 312         FOR_ALL_INTERFACES (vrf, ifp) {
 313                 ri = ifp->info;
 314
 315                 ri->enable_network = 0;
 316                 ri->enable_interface = 0;
 317                 ri->running = 0;
 318
 319                 if (ri->t_wakeup) {
 320                         thread_cancel(ri->t_wakeup);
 321                         ri->t_wakeup = NULL;
 322                 }
 323         }
 324 }
 325
 326 void ripng_interface_reset(void)
 327 {
 328         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 329         struct interface *ifp;
 330         struct ripng_interface *ri;
 331
 332         FOR_ALL_INTERFACES (vrf, ifp) {
 333                 ri = ifp->info;
 334
 335                 ri->enable_network = 0;
 336                 ri->enable_interface = 0;
 337                 ri->running = 0;
 338
 339                 ri->split_horizon = RIPNG_NO_SPLIT_HORIZON;
 340                 ri->split_horizon_default = RIPNG_NO_SPLIT_HORIZON;
 341
 342                 ri->list[RIPNG_FILTER_IN] = NULL;
 343                 ri->list[RIPNG_FILTER_OUT] = NULL;
 344
 345                 ri->prefix[RIPNG_FILTER_IN] = NULL;
 346                 ri->prefix[RIPNG_FILTER_OUT] = NULL;
 347
 348                 if (ri->t_wakeup) {
 349                         thread_cancel(ri->t_wakeup);
 350                         ri->t_wakeup = NULL;
 351                 }
 352
 353                 ri->passive = 0;
 354         }
 355 }
 356
 357 static void ripng_apply_address_add(struct connected *ifc)
 358 {
 359         struct prefix_ipv6 address;
 360         struct prefix *p;
 361
 362         if (!ripng)
 363                 return;
 364
 365         if (!if_is_up(ifc->ifp))
 366                 return;
 367
 368         p = ifc->address;
 369
 370         memset(&address, 0, sizeof(address));
 371         address.family = p->family;
 372         address.prefix = p->u.prefix6;
 373         address.prefixlen = p->prefixlen;
 374         apply_mask_ipv6(&address);
 375
 376         /* Check if this interface is RIP enabled or not
 377            or  Check if this address's prefix is RIP enabled */
 378         if ((ripng_enable_if_lookup(ifc->ifp->name) >= 0)
 379             || (ripng_enable_network_lookup2(ifc) >= 0))
 380                 ripng_redistribute_add(ZEBRA_ROUTE_CONNECT,
 381                                        RIPNG_ROUTE_INTERFACE, &address,
 382                                        ifc->ifp->ifindex, NULL, 0);
 383 }
 384
 385 int ripng_interface_address_add(int command, struct zclient *zclient,
 386                                 zebra_size_t length, vrf_id_t vrf_id)
 387 {
 388         struct connected *c;
 389         struct prefix *p;
 390
 391         c = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_ADD,
 392                                          zclient->ibuf, vrf_id);
 393
 394         if (c == NULL)
 395                 return 0;
 396
 397         p = c->address;
 398
 399         if (p->family == AF_INET6) {
 400                 struct ripng_interface *ri = c->ifp->info;
 401
 402                 if (IS_RIPNG_DEBUG_ZEBRA)
 403                         zlog_debug("RIPng connected address %s/%d add",
 404                                    inet6_ntoa(p->u.prefix6), p->prefixlen);
 405
 406                 /* Check is this prefix needs to be redistributed. */
 407                 ripng_apply_address_add(c);
 408
 409                 /* Let's try once again whether the interface could be activated
 410                  */
 411                 if (!ri->running) {
 412                         /* Check if this interface is RIP enabled or not.*/
 413                         ripng_enable_apply(c->ifp);
 414
 415                         /* Apply distribute list to the interface. */
 416                         ripng_distribute_update_interface(c->ifp);
 417
 418                         /* Check interface routemap. */
 419                         ripng_if_rmap_update_interface(c->ifp);
 420                 }
 421         }
 422
 423         return 0;
 424 }
 425
 426 static void ripng_apply_address_del(struct connected *ifc)
 427 {
 428         struct prefix_ipv6 address;
 429         struct prefix *p;
 430
 431         if (!ripng)
 432                 return;
 433
 434         if (!if_is_up(ifc->ifp))
 435                 return;
 436
 437         p = ifc->address;
 438
 439         memset(&address, 0, sizeof(address));
 440         address.family = p->family;
 441         address.prefix = p->u.prefix6;
 442         address.prefixlen = p->prefixlen;
 443         apply_mask_ipv6(&address);
 444
 445         ripng_redistribute_delete(ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 446                                   &address, ifc->ifp->ifindex);
 447 }
 448
 449 int ripng_interface_address_delete(int command, struct zclient *zclient,
 450                                    zebra_size_t length, vrf_id_t vrf_id)
 451 {
 452         struct connected *ifc;
 453         struct prefix *p;
 454         char buf[INET6_ADDRSTRLEN];
 455
 456         ifc = zebra_interface_address_read(ZEBRA_INTERFACE_ADDRESS_DELETE,
 457                                            zclient->ibuf, vrf_id);
 458
 459         if (ifc) {
 460                 p = ifc->address;
 461
 462                 if (p->family == AF_INET6) {
 463                         if (IS_RIPNG_DEBUG_ZEBRA)
 464                                 zlog_debug(
 465                                         "RIPng connected address %s/%d delete",
 466                                         inet_ntop(AF_INET6, &p->u.prefix6, buf,
 467                                                   INET6_ADDRSTRLEN),
 468                                         p->prefixlen);
 469
 470                         /* Check wether this prefix needs to be removed. */
 471                         ripng_apply_address_del(ifc);
 472                 }
 473                 connected_free(ifc);
 474         }
 475
 476         return 0;
 477 }
 478
 479 /* RIPng enable interface vector. */
 480 vector ripng_enable_if;
 481
 482 /* RIPng enable network table. */
 483 struct agg_table *ripng_enable_network;
 484
 485 /* Lookup RIPng enable network. */
 486 /* Check wether the interface has at least a connected prefix that
 487  * is within the ripng_enable_network table. */
 488 static int ripng_enable_network_lookup_if(struct interface *ifp)
 489 {
 490         struct listnode *node;
 491         struct connected *connected;
 492         struct prefix_ipv6 address;
 493
 494         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 495                 struct prefix *p;
 496                 struct agg_node *n;
 497
 498                 p = connected->address;
 499
 500                 if (p->family == AF_INET6) {
 501                         address.family = AF_INET6;
 502                         address.prefix = p->u.prefix6;
 503                         address.prefixlen = IPV6_MAX_BITLEN;
 504
 505                         n = agg_node_match(ripng_enable_network,
 506                                            (struct prefix *)&address);
 507                         if (n) {
 508                                 agg_unlock_node(n);
 509                                 return 1;
 510                         }
 511                 }
 512         }
 513         return -1;
 514 }
 515
 516 /* Check wether connected is within the ripng_enable_network table. */
 517 static int ripng_enable_network_lookup2(struct connected *connected)
 518 {
 519         struct prefix_ipv6 address;
 520         struct prefix *p;
 521
 522         p = connected->address;
 523
 524         if (p->family == AF_INET6) {
 525                 struct agg_node *node;
 526
 527                 address.family = p->family;
 528                 address.prefix = p->u.prefix6;
 529                 address.prefixlen = IPV6_MAX_BITLEN;
 530
 531                 /* LPM on p->family, p->u.prefix6/IPV6_MAX_BITLEN within
 532                  * ripng_enable_network */
 533                 node = agg_node_match(ripng_enable_network,
 534                                       (struct prefix *)&address);
 535
 536                 if (node) {
 537                         agg_unlock_node(node);
 538                         return 1;
 539                 }
 540         }
 541
 542         return -1;
 543 }
 544
 545 /* Add RIPng enable network. */
 546 int ripng_enable_network_add(struct prefix *p)
 547 {
 548         struct agg_node *node;
 549
 550         node = agg_node_get(ripng_enable_network, p);
 551
 552         if (node->info) {
 553                 agg_unlock_node(node);
 554                 return NB_ERR_INCONSISTENCY;
 555         } else
 556                 node->info = (void *)1;
 557
 558         /* XXX: One should find a better solution than a generic one */
 559         ripng_enable_apply_all();
 560
 561         return NB_OK;
 562 }
 563
 564 /* Delete RIPng enable network. */
 565 int ripng_enable_network_delete(struct prefix *p)
 566 {
 567         struct agg_node *node;
 568
 569         node = agg_node_lookup(ripng_enable_network, p);
 570         if (node) {
 571                 node->info = NULL;
 572
 573                 /* Unlock info lock. */
 574                 agg_unlock_node(node);
 575
 576                 /* Unlock lookup lock. */
 577                 agg_unlock_node(node);
 578
 579                 return NB_OK;
 580         }
 581
 582         return NB_ERR_INCONSISTENCY;
 583 }
 584
 585 /* Lookup function. */
 586 static int ripng_enable_if_lookup(const char *ifname)
 587 {
 588         unsigned int i;
 589         char *str;
 590
 591         for (i = 0; i < vector_active(ripng_enable_if); i++)
 592                 if ((str = vector_slot(ripng_enable_if, i)) != NULL)
 593                         if (strcmp(str, ifname) == 0)
 594                                 return i;
 595         return -1;
 596 }
 597
 598 /* Add interface to ripng_enable_if. */
 599 int ripng_enable_if_add(const char *ifname)
 600 {
 601         int ret;
 602
 603         ret = ripng_enable_if_lookup(ifname);
 604         if (ret >= 0)
 605                 return NB_ERR_INCONSISTENCY;
 606
 607         vector_set(ripng_enable_if, strdup(ifname));
 608
 609         ripng_enable_apply_all();
 610
 611         return NB_OK;
 612 }
 613
 614 /* Delete interface from ripng_enable_if. */
 615 int ripng_enable_if_delete(const char *ifname)
 616 {
 617         int index;
 618         char *str;
 619
 620         index = ripng_enable_if_lookup(ifname);
 621         if (index < 0)
 622                 return NB_ERR_INCONSISTENCY;
 623
 624         str = vector_slot(ripng_enable_if, index);
 625         free(str);
 626         vector_unset(ripng_enable_if, index);
 627
 628         ripng_enable_apply_all();
 629
 630         return NB_OK;
 631 }
 632
 633 /* Wake up interface. */
 634 static int ripng_interface_wakeup(struct thread *t)
 635 {
 636         struct interface *ifp;
 637         struct ripng_interface *ri;
 638
 639         /* Get interface. */
 640         ifp = THREAD_ARG(t);
 641
 642         ri = ifp->info;
 643         ri->t_wakeup = NULL;
 644
 645         /* Join to multicast group. */
 646         if (ripng_multicast_join(ifp) < 0) {
 647                 flog_err_sys(EC_LIB_SOCKET,
 648                              "multicast join failed, interface %s not running",
 649                              ifp->name);
 650                 return 0;
 651         }
 652
 653         /* Set running flag. */
 654         ri->running = 1;
 655
 656         /* Send RIP request to the interface. */
 657         ripng_request(ifp);
 658
 659         return 0;
 660 }
 661
 662 static void ripng_connect_set(struct interface *ifp, int set)
 663 {
 664         struct listnode *node, *nnode;
 665         struct connected *connected;
 666         struct prefix_ipv6 address;
 667
 668         for (ALL_LIST_ELEMENTS(ifp->connected, node, nnode, connected)) {
 669                 struct prefix *p;
 670                 p = connected->address;
 671
 672                 if (p->family != AF_INET6)
 673                         continue;
 674
 675                 address.family = AF_INET6;
 676                 address.prefix = p->u.prefix6;
 677                 address.prefixlen = p->prefixlen;
 678                 apply_mask_ipv6(&address);
 679
 680                 if (set) {
 681                         /* Check once more wether this prefix is within a
 682                          * "network IF_OR_PREF" one */
 683                         if ((ripng_enable_if_lookup(connected->ifp->name) >= 0)
 684                             || (ripng_enable_network_lookup2(connected) >= 0))
 685                                 ripng_redistribute_add(
 686                                         ZEBRA_ROUTE_CONNECT,
 687                                         RIPNG_ROUTE_INTERFACE, &address,
 688                                         connected->ifp->ifindex, NULL, 0);
 689                 } else {
 690                         ripng_redistribute_delete(
 691                                 ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 692                                 &address, connected->ifp->ifindex);
 693                         if (ripng_redistribute_check(ZEBRA_ROUTE_CONNECT))
 694                                 ripng_redistribute_add(
 695                                         ZEBRA_ROUTE_CONNECT,
 696                                         RIPNG_ROUTE_REDISTRIBUTE, &address,
 697                                         connected->ifp->ifindex, NULL, 0);
 698                 }
 699         }
 700 }
 701
 702 /* Check RIPng is enabed on this interface. */
 703 void ripng_enable_apply(struct interface *ifp)
 704 {
 705         int ret;
 706         struct ripng_interface *ri = NULL;
 707
 708         /* Check interface. */
 709         if (!if_is_up(ifp))
 710                 return;
 711
 712         ri = ifp->info;
 713
 714         /* Is this interface a candidate for RIPng ? */
 715         ret = ripng_enable_network_lookup_if(ifp);
 716
 717         /* If the interface is matched. */
 718         if (ret > 0)
 719                 ri->enable_network = 1;
 720         else
 721                 ri->enable_network = 0;
 722
 723         /* Check interface name configuration. */
 724         ret = ripng_enable_if_lookup(ifp->name);
 725         if (ret >= 0)
 726                 ri->enable_interface = 1;
 727         else
 728                 ri->enable_interface = 0;
 729
 730         /* any candidate interface MUST have a link-local IPv6 address */
 731         if ((!ripng_if_ipv6_lladdress_check(ifp))
 732             && (ri->enable_network || ri->enable_interface)) {
 733                 ri->enable_network = 0;
 734                 ri->enable_interface = 0;
 735                 zlog_warn("Interface %s does not have any link-local address",
 736                           ifp->name);
 737         }
 738
 739         /* Update running status of the interface. */
 740         if (ri->enable_network || ri->enable_interface) {
 741                 zlog_info("RIPng INTERFACE ON %s", ifp->name);
 742
 743                 /* Add interface wake up thread. */
 744                 thread_add_timer(master, ripng_interface_wakeup, ifp, 1,
 745                                  &ri->t_wakeup);
 746
 747                 ripng_connect_set(ifp, 1);
 748         } else {
 749                 if (ri->running) {
 750                         /* Might as well clean up the route table as well
 751                          * ripng_if_down sets to 0 ri->running, and displays
 752                          *"turn off %s"
 753                          **/
 754                         ripng_if_down(ifp);
 755
 756                         ripng_connect_set(ifp, 0);
 757                 }
 758         }
 759 }
 760
 761 /* Set distribute list to all interfaces. */
 762 static void ripng_enable_apply_all(void)
 763 {
 764         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 765         struct interface *ifp;
 766
 767         FOR_ALL_INTERFACES (vrf, ifp)
 768                 ripng_enable_apply(ifp);
 769 }
 770
 771 /* Clear all network and neighbor configuration */
 772 void ripng_clean_network()
 773 {
 774         unsigned int i;
 775         char *str;
 776         struct agg_node *rn;
 777
 778         /* ripng_enable_network */
 779         for (rn = agg_route_top(ripng_enable_network); rn;
 780              rn = agg_route_next(rn))
 781                 if (rn->info) {
 782                         rn->info = NULL;
 783                         agg_unlock_node(rn);
 784                 }
 785
 786         /* ripng_enable_if */
 787         for (i = 0; i < vector_active(ripng_enable_if); i++)
 788                 if ((str = vector_slot(ripng_enable_if, i)) != NULL) {
 789                         free(str);
 790                         vector_slot(ripng_enable_if, i) = NULL;
 791                 }
 792 }
 793
 794 /* Vector to store passive-interface name. */
 795 vector Vripng_passive_interface;
 796
 797 /* Utility function for looking up passive interface settings. */
 798 static int ripng_passive_interface_lookup(const char *ifname)
 799 {
 800         unsigned int i;
 801         char *str;
 802
 803         for (i = 0; i < vector_active(Vripng_passive_interface); i++)
 804                 if ((str = vector_slot(Vripng_passive_interface, i)) != NULL)
 805                         if (strcmp(str, ifname) == 0)
 806                                 return i;
 807         return -1;
 808 }
 809
 810 void ripng_passive_interface_apply(struct interface *ifp)
 811 {
 812         int ret;
 813         struct ripng_interface *ri;
 814
 815         ri = ifp->info;
 816
 817         ret = ripng_passive_interface_lookup(ifp->name);
 818         if (ret < 0)
 819                 ri->passive = 0;
 820         else
 821                 ri->passive = 1;
 822 }
 823
 824 static void ripng_passive_interface_apply_all(void)
 825 {
 826         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 827         struct interface *ifp;
 828
 829         FOR_ALL_INTERFACES (vrf, ifp)
 830                 ripng_passive_interface_apply(ifp);
 831 }
 832
 833 /* Passive interface. */
 834 int ripng_passive_interface_set(const char *ifname)
 835 {
 836         if (ripng_passive_interface_lookup(ifname) >= 0)
 837                 return NB_ERR_INCONSISTENCY;
 838
 839         vector_set(Vripng_passive_interface, strdup(ifname));
 840
 841         ripng_passive_interface_apply_all();
 842
 843         return NB_OK;
 844 }
 845
 846 int ripng_passive_interface_unset(const char *ifname)
 847 {
 848         int i;
 849         char *str;
 850
 851         i = ripng_passive_interface_lookup(ifname);
 852         if (i < 0)
 853                 return NB_ERR_INCONSISTENCY;
 854
 855         str = vector_slot(Vripng_passive_interface, i);
 856         free(str);
 857         vector_unset(Vripng_passive_interface, i);
 858
 859         ripng_passive_interface_apply_all();
 860
 861         return NB_OK;
 862 }
 863
 864 /* Free all configured RIP passive-interface settings. */
 865 void ripng_passive_interface_clean(void)
 866 {
 867         unsigned int i;
 868         char *str;
 869
 870         for (i = 0; i < vector_active(Vripng_passive_interface); i++)
 871                 if ((str = vector_slot(Vripng_passive_interface, i)) != NULL) {
 872                         free(str);
 873                         vector_slot(Vripng_passive_interface, i) = NULL;
 874                 }
 875         ripng_passive_interface_apply_all();
 876 }
 877
 878 /* Write RIPng enable network and interface to the vty. */
 879 int ripng_network_write(struct vty *vty)
 880 {
 881         unsigned int i;
 882         const char *ifname;
 883         struct agg_node *node;
 884         char buf[BUFSIZ];
 885
 886         /* Write enable network. */
 887         for (node = agg_route_top(ripng_enable_network); node;
 888              node = agg_route_next(node))
 889                 if (node->info) {
 890                         struct prefix *p = &node->p;
 891                         vty_out(vty, "    %s/%d\n",
 892                                 inet_ntop(p->family, &p->u.prefix, buf, BUFSIZ),
 893                                 p->prefixlen);
 894                 }
 895
 896         /* Write enable interface. */
 897         for (i = 0; i < vector_active(ripng_enable_if); i++)
 898                 if ((ifname = vector_slot(ripng_enable_if, i)) != NULL)
 899                         vty_out(vty, "    %s\n", ifname);
 900
 901         return 0;
 902 }
 903
 904 DEFUN (ipv6_ripng_split_horizon,
 905        ipv6_ripng_split_horizon_cmd,
 906        "ipv6 ripng split-horizon",
 907        IPV6_STR
 908        "Routing Information Protocol\n"
 909        "Perform split horizon\n")
 910 {
 911         VTY_DECLVAR_CONTEXT(interface, ifp);
 912         struct ripng_interface *ri;
 913
 914         ri = ifp->info;
 915
 916         ri->split_horizon = RIPNG_SPLIT_HORIZON;
 917         return CMD_SUCCESS;
 918 }
 919
 920 DEFUN (ipv6_ripng_split_horizon_poisoned_reverse,
 921        ipv6_ripng_split_horizon_poisoned_reverse_cmd,
 922        "ipv6 ripng split-horizon poisoned-reverse",
 923        IPV6_STR
 924        "Routing Information Protocol\n"
 925        "Perform split horizon\n"
 926        "With poisoned-reverse\n")
 927 {
 928         VTY_DECLVAR_CONTEXT(interface, ifp);
 929         struct ripng_interface *ri;
 930
 931         ri = ifp->info;
 932
 933         ri->split_horizon = RIPNG_SPLIT_HORIZON_POISONED_REVERSE;
 934         return CMD_SUCCESS;
 935 }
 936
 937 DEFUN (no_ipv6_ripng_split_horizon,
 938        no_ipv6_ripng_split_horizon_cmd,
 939        "no ipv6 ripng split-horizon [poisoned-reverse]",
 940        NO_STR
 941        IPV6_STR
 942        "Routing Information Protocol\n"
 943        "Perform split horizon\n"
 944        "With poisoned-reverse\n")
 945 {
 946         VTY_DECLVAR_CONTEXT(interface, ifp);
 947         struct ripng_interface *ri;
 948
 949         ri = ifp->info;
 950
 951         ri->split_horizon = RIPNG_NO_SPLIT_HORIZON;
 952         return CMD_SUCCESS;
 953 }
 954
 955 static struct ripng_interface *ri_new(void)
 956 {
 957         struct ripng_interface *ri;
 958         ri = XCALLOC(MTYPE_IF, sizeof(struct ripng_interface));
 959
 960         /* Set default split-horizon behavior.  If the interface is Frame
 961            Relay or SMDS is enabled, the default value for split-horizon is
 962            off.  But currently Zebra does detect Frame Relay or SMDS
 963            interface.  So all interface is set to split horizon.  */
 964         ri->split_horizon_default = RIPNG_SPLIT_HORIZON;
 965         ri->split_horizon = ri->split_horizon_default;
 966
 967         return ri;
 968 }
 969
 970 static int ripng_if_new_hook(struct interface *ifp)
 971 {
 972         ifp->info = ri_new();
 973         return 0;
 974 }
 975
 976 /* Called when interface structure deleted. */
 977 static int ripng_if_delete_hook(struct interface *ifp)
 978 {
 979         XFREE(MTYPE_IF, ifp->info);
 980         ifp->info = NULL;
 981         return 0;
 982 }
 983
 984 /* Configuration write function for ripngd. */
 985 static int interface_config_write(struct vty *vty)
 986 {
 987         struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
 988         struct interface *ifp;
 989         struct ripng_interface *ri;
 990         int write = 0;
 991
 992         FOR_ALL_INTERFACES (vrf, ifp) {
 993                 ri = ifp->info;
 994
 995                 /* Do not display the interface if there is no
 996                  * configuration about it.
 997                  **/
 998                 if ((!ifp->desc)
 999                     && (ri->split_horizon == ri->split_horizon_default))
1000                         continue;
1001
1002                 vty_frame(vty, "interface %s\n", ifp->name);
1003                 if (ifp->desc)
1004                         vty_out(vty, " description %s\n", ifp->desc);
1005
1006                 /* Split horizon. */
1007                 if (ri->split_horizon != ri->split_horizon_default) {
1008                         switch (ri->split_horizon) {
1009                         case RIPNG_SPLIT_HORIZON:
1010                                 vty_out(vty, " ipv6 ripng split-horizon\n");
1011                                 break;
1012                         case RIPNG_SPLIT_HORIZON_POISONED_REVERSE:
1013                                 vty_out(vty,
1014                                         " ipv6 ripng split-horizon poisoned-reverse\n");
1015                                 break;
1016                         case RIPNG_NO_SPLIT_HORIZON:
1017                         default:
1018                                 vty_out(vty, " no ipv6 ripng split-horizon\n");
1019                                 break;
1020                         }
1021                 }
1022
1023                 vty_endframe(vty, "!\n");
1024
1025                 write++;
1026         }
1027         return write;
1028 }
1029
1030 /* ripngd's interface node. */
1031 static struct cmd_node interface_node = {
1032         INTERFACE_NODE, "%s(config-if)# ", 1 /* VTYSH */
1033 };
1034
1035 /* Initialization of interface. */
1036 void ripng_if_init()
1037 {
1038         /* Interface initialize. */
1039         hook_register_prio(if_add, 0, ripng_if_new_hook);
1040         hook_register_prio(if_del, 0, ripng_if_delete_hook);
1041
1042         /* RIPng enable network init. */
1043         ripng_enable_network = agg_table_init();
1044
1045         /* RIPng enable interface init. */
1046         ripng_enable_if = vector_init(1);
1047
1048         /* RIPng passive interface. */
1049         Vripng_passive_interface = vector_init(1);
1050
1051         /* Install interface node. */
1052         install_node(&interface_node, interface_config_write);
1053         if_cmd_init();
1054
1055         install_element(INTERFACE_NODE, &ipv6_ripng_split_horizon_cmd);
1056         install_element(INTERFACE_NODE,
1057                         &ipv6_ripng_split_horizon_poisoned_reverse_cmd);
1058         install_element(INTERFACE_NODE, &no_ipv6_ripng_split_horizon_cmd);
1059 }