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