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 "table.h"
  35 #include "thread.h"
  36 #include "privs.h"
  37 #include "vrf.h"
  38
  39 #include "ripngd/ripngd.h"
  40 #include "ripngd/ripng_debug.h"
  41
  42 /* If RFC2133 definition is used. */
  43 #ifndef IPV6_JOIN_GROUP
  44 #define IPV6_JOIN_GROUP  IPV6_ADD_MEMBERSHIP
  45 #endif
  46 #ifndef IPV6_LEAVE_GROUP
  47 #define IPV6_LEAVE_GROUP IPV6_DROP_MEMBERSHIP
  48 #endif
  49
  50 extern struct zebra_privs_t ripngd_privs;
  51
  52 /* Static utility function. */
  53 static void ripng_enable_apply (struct interface *);
  54 static void ripng_passive_interface_apply (struct interface *);
  55 static int ripng_enable_if_lookup (const char *);
  56 static int ripng_enable_network_lookup2 (struct connected *);
  57 static void ripng_enable_apply_all (void);
  58
  59 /* Join to the all rip routers multicast group. */
  60 static int
  61 ripng_multicast_join (struct interface *ifp)
  62 {
  63   int ret;
  64   struct ipv6_mreq mreq;
  65   int save_errno;
  66
  67   if (if_is_multicast (ifp)) {
  68     memset (&mreq, 0, sizeof (mreq));
  69     inet_pton(AF_INET6, RIPNG_GROUP, &mreq.ipv6mr_multiaddr);
  70     mreq.ipv6mr_interface = ifp->ifindex;
  71
  72     /*
  73      * NetBSD 1.6.2 requires root to join groups on gif(4).
  74      * While this is bogus, privs are available and easy to use
  75      * for this call as a workaround.
  76      */
  77     if (ripngd_privs.change (ZPRIVS_RAISE))
  78       zlog_err ("ripng_multicast_join: could not raise privs");
  79
  80     ret = setsockopt (ripng->sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
  81                       (char *) &mreq, sizeof (mreq));
  82     save_errno = errno;
  83
  84     if (ripngd_privs.change (ZPRIVS_LOWER))
  85       zlog_err ("ripng_multicast_join: could not lower privs");
  86
  87     if (ret < 0 && save_errno == EADDRINUSE)
  88       {
  89         /*
  90          * Group is already joined.  This occurs due to sloppy group
  91          * management, in particular declining to leave the group on
  92          * an interface that has just gone down.
  93          */
  94         zlog_warn ("ripng join on %s EADDRINUSE (ignoring)\n", ifp->name);
  95         return 0;               /* not an error */
  96       }
  97
  98     if (ret < 0)
  99       zlog_warn ("can't setsockopt IPV6_JOIN_GROUP: %s",
 100                  safe_strerror (save_errno));
 101
 102     if (IS_RIPNG_DEBUG_EVENT)
 103       zlog_debug ("RIPng %s join to all-rip-routers multicast group", ifp->name);
 104
 105     if (ret < 0)
 106       return -1;
 107   }
 108   return 0;
 109 }
 110
 111 /* Leave from the all rip routers multicast group. */
 112 static int
 113 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", safe_strerror (errno));
 127
 128     if (IS_RIPNG_DEBUG_EVENT)
 129       zlog_debug ("RIPng %s leave from all-rip-routers multicast group",
 130                  ifp->name);
 131
 132     if (ret < 0)
 133       return -1;
 134   }
 135
 136   return 0;
 137 }
 138
 139 /* How many link local IPv6 address could be used on the interface ? */
 140 static int
 141 ripng_if_ipv6_lladdress_check (struct interface *ifp)
 142 {
 143   struct listnode *nn;
 144   struct connected *connected;
 145   int count = 0;
 146
 147   for (ALL_LIST_ELEMENTS_RO (ifp->connected, nn, connected))
 148     {
 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
 161 ripng_if_down (struct interface *ifp)
 162 {
 163   struct route_node *rp;
 164   struct ripng_info *rinfo;
 165   struct ripng_interface *ri;
 166   struct list *list = NULL;
 167   struct listnode *listnode = NULL, *nextnode = NULL;
 168
 169   if (ripng)
 170     for (rp = route_top (ripng->table); rp; rp = route_next (rp))
 171       if ((list = rp->info) != NULL)
 172         for (ALL_LIST_ELEMENTS (list, listnode, nextnode, rinfo))
 173           if (rinfo->ifindex == ifp->ifindex)
 174             ripng_ecmp_delete (rinfo);
 175
 176   ri = ifp->info;
 177
 178   if (ri->running)
 179    {
 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
 194 ripng_interface_up (int command, struct zclient *zclient, zebra_size_t length,
 195     vrf_id_t vrf_id)
 196 {
 197   struct stream *s;
 198   struct interface *ifp;
 199
 200   /* zebra_interface_state_read() updates interface structure in iflist. */
 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 ("interface up %s index %d flags %llx metric %d mtu %d",
 209                ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
 210                ifp->metric, ifp->mtu6);
 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 int
 226 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   s = zclient->ibuf;
 234   ifp = zebra_interface_state_read (s, vrf_id);
 235
 236   if (ifp == NULL)
 237     return 0;
 238
 239   ripng_if_down (ifp);
 240
 241   if (IS_RIPNG_DEBUG_ZEBRA)
 242     zlog_debug ("interface down %s index %d flags %#llx metric %d mtu %d",
 243                 ifp->name, ifp->ifindex,
 244                 (unsigned long long) ifp->flags, ifp->metric, ifp->mtu6);
 245
 246   return 0;
 247 }
 248
 249 /* Inteface addition message from zebra. */
 250 int
 251 ripng_interface_add (int command, struct zclient *zclient, zebra_size_t length,
 252     vrf_id_t vrf_id)
 253 {
 254   struct interface *ifp;
 255
 256   ifp = zebra_interface_add_read (zclient->ibuf, vrf_id);
 257
 258   if (IS_RIPNG_DEBUG_ZEBRA)
 259     zlog_debug ("RIPng interface add %s index %d flags %#llx metric %d mtu %d",
 260                 ifp->name, ifp->ifindex, (unsigned long long) ifp->flags,
 261                 ifp->metric, ifp->mtu6);
 262
 263   /* Check is this interface is RIP enabled or not.*/
 264   ripng_enable_apply (ifp);
 265
 266   /* Apply distribute list to the interface. */
 267   ripng_distribute_update_interface (ifp);
 268
 269   /* Check interface routemap. */
 270   ripng_if_rmap_update_interface (ifp);
 271
 272   return 0;
 273 }
 274
 275 int
 276 ripng_interface_delete (int command, struct zclient *zclient,
 277                         zebra_size_t length, vrf_id_t vrf_id)
 278 {
 279   struct interface *ifp;
 280   struct stream *s;
 281
 282   s = zclient->ibuf;
 283   /*  zebra_interface_state_read() updates interface structure in iflist */
 284   ifp = zebra_interface_state_read (s, vrf_id);
 285
 286   if (ifp == NULL)
 287     return 0;
 288
 289   if (if_is_up (ifp)) {
 290     ripng_if_down(ifp);
 291   }
 292
 293   zlog_info("interface delete %s index %d flags %#llx metric %d mtu %d",
 294             ifp->name, ifp->ifindex, (unsigned long long) ifp->flags,
 295             ifp->metric, ifp->mtu6);
 296
 297   /* To support pseudo interface do not free interface structure.  */
 298   /* if_delete(ifp); */
 299   ifp->ifindex = IFINDEX_DELETED;
 300
 301   return 0;
 302 }
 303
 304 void
 305 ripng_interface_clean (void)
 306 {
 307   struct listnode *node, *nnode;
 308   struct interface *ifp;
 309   struct ripng_interface *ri;
 310
 311   for (ALL_LIST_ELEMENTS (vrf_iflist (VRF_DEFAULT), node, nnode, ifp))
 312     {
 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         {
 321           thread_cancel (ri->t_wakeup);
 322           ri->t_wakeup = NULL;
 323         }
 324     }
 325 }
 326
 327 void
 328 ripng_interface_reset (void)
 329 {
 330   struct listnode *node;
 331   struct interface *ifp;
 332   struct ripng_interface *ri;
 333
 334   for (ALL_LIST_ELEMENTS_RO (vrf_iflist (VRF_DEFAULT), node, ifp))
 335     {
 336       ri = ifp->info;
 337
 338       ri->enable_network = 0;
 339       ri->enable_interface = 0;
 340       ri->running = 0;
 341
 342       ri->split_horizon = RIPNG_NO_SPLIT_HORIZON;
 343       ri->split_horizon_default = RIPNG_NO_SPLIT_HORIZON;
 344
 345       ri->list[RIPNG_FILTER_IN] = NULL;
 346       ri->list[RIPNG_FILTER_OUT] = NULL;
 347
 348       ri->prefix[RIPNG_FILTER_IN] = NULL;
 349       ri->prefix[RIPNG_FILTER_OUT] = NULL;
 350
 351       if (ri->t_wakeup)
 352         {
 353           thread_cancel (ri->t_wakeup);
 354           ri->t_wakeup = NULL;
 355         }
 356
 357       ri->passive = 0;
 358     }
 359 }
 360
 361 static void
 362 ripng_apply_address_add (struct connected *ifc) {
 363   struct prefix_ipv6 address;
 364   struct prefix *p;
 365
 366   if (!ripng)
 367     return;
 368
 369   if (! if_is_up(ifc->ifp))
 370     return;
 371
 372   p = ifc->address;
 373
 374   memset (&address, 0, sizeof (address));
 375   address.family = p->family;
 376   address.prefix = p->u.prefix6;
 377   address.prefixlen = p->prefixlen;
 378   apply_mask_ipv6(&address);
 379
 380   /* Check if this interface is RIP enabled or not
 381      or  Check if this address's prefix is RIP enabled */
 382   if ((ripng_enable_if_lookup(ifc->ifp->name) >= 0) ||
 383       (ripng_enable_network_lookup2(ifc) >= 0))
 384     ripng_redistribute_add(ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 385                            &address, ifc->ifp->ifindex, NULL, 0);
 386
 387 }
 388
 389 int
 390 ripng_interface_address_add (int command, struct zclient *zclient,
 391                              zebra_size_t length, vrf_id_t vrf_id)
 392 {
 393   struct connected *c;
 394   struct prefix *p;
 395
 396   c = zebra_interface_address_read (ZEBRA_INTERFACE_ADDRESS_ADD,
 397                                     zclient->ibuf, vrf_id);
 398
 399   if (c == NULL)
 400     return 0;
 401
 402   p = c->address;
 403
 404   if (p->family == AF_INET6)
 405     {
 406       struct ripng_interface *ri = c->ifp->info;
 407
 408       if (IS_RIPNG_DEBUG_ZEBRA)
 409         zlog_debug ("RIPng connected address %s/%d add",
 410                    inet6_ntoa(p->u.prefix6),
 411                    p->prefixlen);
 412
 413       /* Check is this prefix needs to be redistributed. */
 414       ripng_apply_address_add(c);
 415
 416       /* Let's try once again whether the interface could be activated */
 417       if (!ri->running) {
 418         /* Check if this interface is RIP enabled or not.*/
 419         ripng_enable_apply (c->ifp);
 420
 421         /* Apply distribute list to the interface. */
 422         ripng_distribute_update_interface (c->ifp);
 423
 424         /* Check interface routemap. */
 425         ripng_if_rmap_update_interface (c->ifp);
 426       }
 427
 428     }
 429
 430   return 0;
 431 }
 432
 433 static void
 434 ripng_apply_address_del (struct connected *ifc) {
 435   struct prefix_ipv6 address;
 436   struct prefix *p;
 437
 438   if (!ripng)
 439     return;
 440
 441   if (! if_is_up(ifc->ifp))
 442     return;
 443
 444   p = ifc->address;
 445
 446   memset (&address, 0, sizeof (address));
 447   address.family = p->family;
 448   address.prefix = p->u.prefix6;
 449   address.prefixlen = p->prefixlen;
 450   apply_mask_ipv6(&address);
 451
 452   ripng_redistribute_delete(ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 453                             &address, ifc->ifp->ifindex);
 454 }
 455
 456 int
 457 ripng_interface_address_delete (int command, struct zclient *zclient,
 458                                 zebra_size_t length, vrf_id_t vrf_id)
 459 {
 460   struct connected *ifc;
 461   struct prefix *p;
 462   char buf[INET6_ADDRSTRLEN];
 463
 464   ifc = zebra_interface_address_read (ZEBRA_INTERFACE_ADDRESS_DELETE,
 465                                       zclient->ibuf, vrf_id);
 466
 467   if (ifc)
 468     {
 469       p = ifc->address;
 470
 471       if (p->family == AF_INET6)
 472         {
 473           if (IS_RIPNG_DEBUG_ZEBRA)
 474             zlog_debug ("RIPng connected address %s/%d delete",
 475                        inet_ntop (AF_INET6, &p->u.prefix6, buf,
 476                                   INET6_ADDRSTRLEN),
 477                        p->prefixlen);
 478
 479           /* Check wether this prefix needs to be removed. */
 480           ripng_apply_address_del(ifc);
 481         }
 482       connected_free (ifc);
 483     }
 484
 485   return 0;
 486 }
 487
 488 /* RIPng enable interface vector. */
 489 vector ripng_enable_if;
 490
 491 /* RIPng enable network table. */
 492 struct route_table *ripng_enable_network;
 493
 494 /* Lookup RIPng enable network. */
 495 /* Check wether the interface has at least a connected prefix that
 496  * is within the ripng_enable_network table. */
 497 static int
 498 ripng_enable_network_lookup_if (struct interface *ifp)
 499 {
 500   struct listnode *node;
 501   struct connected *connected;
 502   struct prefix_ipv6 address;
 503
 504   for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, connected))
 505     {
 506       struct prefix *p;
 507       struct route_node *node;
 508
 509       p = connected->address;
 510
 511       if (p->family == AF_INET6)
 512         {
 513           address.family = AF_INET6;
 514           address.prefix = p->u.prefix6;
 515           address.prefixlen = IPV6_MAX_BITLEN;
 516
 517           node = route_node_match (ripng_enable_network,
 518                                    (struct prefix *)&address);
 519           if (node)
 520             {
 521               route_unlock_node (node);
 522               return 1;
 523             }
 524         }
 525     }
 526   return -1;
 527 }
 528
 529 /* Check wether connected is within the ripng_enable_network table. */
 530 static int
 531 ripng_enable_network_lookup2 (struct connected *connected)
 532 {
 533   struct prefix_ipv6 address;
 534   struct prefix *p;
 535
 536   p = connected->address;
 537
 538   if (p->family == AF_INET6) {
 539     struct route_node *node;
 540
 541     address.family = p->family;
 542     address.prefix = p->u.prefix6;
 543     address.prefixlen = IPV6_MAX_BITLEN;
 544
 545     /* LPM on p->family, p->u.prefix6/IPV6_MAX_BITLEN within ripng_enable_network */
 546     node = route_node_match (ripng_enable_network,
 547                              (struct prefix *)&address);
 548
 549     if (node) {
 550       route_unlock_node (node);
 551       return 1;
 552     }
 553   }
 554
 555   return -1;
 556 }
 557
 558 /* Add RIPng enable network. */
 559 static int
 560 ripng_enable_network_add (struct prefix *p)
 561 {
 562   struct route_node *node;
 563
 564   node = route_node_get (ripng_enable_network, p);
 565
 566   if (node->info)
 567     {
 568       route_unlock_node (node);
 569       return -1;
 570     }
 571   else
 572     node->info = (void *)1;
 573
 574   /* XXX: One should find a better solution than a generic one */
 575   ripng_enable_apply_all();
 576
 577   return 1;
 578 }
 579
 580 /* Delete RIPng enable network. */
 581 static int
 582 ripng_enable_network_delete (struct prefix *p)
 583 {
 584   struct route_node *node;
 585
 586   node = route_node_lookup (ripng_enable_network, p);
 587   if (node)
 588     {
 589       node->info = NULL;
 590
 591       /* Unlock info lock. */
 592       route_unlock_node (node);
 593
 594       /* Unlock lookup lock. */
 595       route_unlock_node (node);
 596
 597       return 1;
 598     }
 599   return -1;
 600 }
 601
 602 /* Lookup function. */
 603 static int
 604 ripng_enable_if_lookup (const char *ifname)
 605 {
 606   unsigned int i;
 607   char *str;
 608
 609   for (i = 0; i < vector_active (ripng_enable_if); i++)
 610     if ((str = vector_slot (ripng_enable_if, i)) != NULL)
 611       if (strcmp (str, ifname) == 0)
 612         return i;
 613   return -1;
 614 }
 615
 616 /* Add interface to ripng_enable_if. */
 617 static int
 618 ripng_enable_if_add (const char *ifname)
 619 {
 620   int ret;
 621
 622   ret = ripng_enable_if_lookup (ifname);
 623   if (ret >= 0)
 624     return -1;
 625
 626   vector_set (ripng_enable_if, strdup (ifname));
 627
 628   ripng_enable_apply_all();
 629
 630   return 1;
 631 }
 632
 633 /* Delete interface from ripng_enable_if. */
 634 static int
 635 ripng_enable_if_delete (const char *ifname)
 636 {
 637   int index;
 638   char *str;
 639
 640   index = ripng_enable_if_lookup (ifname);
 641   if (index < 0)
 642     return -1;
 643
 644   str = vector_slot (ripng_enable_if, index);
 645   free (str);
 646   vector_unset (ripng_enable_if, index);
 647
 648   ripng_enable_apply_all();
 649
 650   return 1;
 651 }
 652
 653 /* Wake up interface. */
 654 static int
 655 ripng_interface_wakeup (struct thread *t)
 656 {
 657   struct interface *ifp;
 658   struct ripng_interface *ri;
 659
 660   /* Get interface. */
 661   ifp = THREAD_ARG (t);
 662
 663   ri = ifp->info;
 664   ri->t_wakeup = NULL;
 665
 666   /* Join to multicast group. */
 667   if (ripng_multicast_join (ifp) < 0) {
 668     zlog_err ("multicast join failed, interface %s not running", ifp->name);
 669     return 0;
 670   }
 671
 672   /* Set running flag. */
 673   ri->running = 1;
 674
 675   /* Send RIP request to the interface. */
 676   ripng_request (ifp);
 677
 678   return 0;
 679 }
 680
 681 static void
 682 ripng_connect_set (struct interface *ifp, int set)
 683 {
 684   struct listnode *node, *nnode;
 685   struct connected *connected;
 686   struct prefix_ipv6 address;
 687
 688   for (ALL_LIST_ELEMENTS (ifp->connected, node, nnode, connected))
 689     {
 690       struct prefix *p;
 691       p = connected->address;
 692
 693       if (p->family != AF_INET6)
 694         continue;
 695
 696       address.family = AF_INET6;
 697       address.prefix = p->u.prefix6;
 698       address.prefixlen = p->prefixlen;
 699       apply_mask_ipv6 (&address);
 700
 701       if (set) {
 702         /* Check once more wether this prefix is within a "network IF_OR_PREF" one */
 703         if ((ripng_enable_if_lookup(connected->ifp->name) >= 0) ||
 704             (ripng_enable_network_lookup2(connected) >= 0))
 705           ripng_redistribute_add (ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 706                                   &address, connected->ifp->ifindex, NULL, 0);
 707       } else {
 708         ripng_redistribute_delete (ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_INTERFACE,
 709                                    &address, connected->ifp->ifindex);
 710         if (ripng_redistribute_check (ZEBRA_ROUTE_CONNECT))
 711           ripng_redistribute_add (ZEBRA_ROUTE_CONNECT, RIPNG_ROUTE_REDISTRIBUTE,
 712                                   &address, connected->ifp->ifindex, NULL, 0);
 713       }
 714     }
 715 }
 716
 717 /* Check RIPng is enabed on this interface. */
 718 void
 719 ripng_enable_apply (struct interface *ifp)
 720 {
 721   int ret;
 722   struct ripng_interface *ri = NULL;
 723
 724   /* Check interface. */
 725   if (! if_is_up (ifp))
 726     return;
 727
 728   ri = ifp->info;
 729
 730   /* Is this interface a candidate for RIPng ? */
 731   ret = ripng_enable_network_lookup_if (ifp);
 732
 733   /* If the interface is matched. */
 734   if (ret > 0)
 735     ri->enable_network = 1;
 736   else
 737     ri->enable_network = 0;
 738
 739   /* Check interface name configuration. */
 740   ret = ripng_enable_if_lookup (ifp->name);
 741   if (ret >= 0)
 742     ri->enable_interface = 1;
 743   else
 744     ri->enable_interface = 0;
 745
 746   /* any candidate interface MUST have a link-local IPv6 address */
 747   if ((! ripng_if_ipv6_lladdress_check (ifp)) &&
 748       (ri->enable_network || ri->enable_interface)) {
 749     ri->enable_network = 0;
 750     ri->enable_interface = 0;
 751     zlog_warn("Interface %s does not have any link-local address",
 752               ifp->name);
 753   }
 754
 755   /* Update running status of the interface. */
 756   if (ri->enable_network || ri->enable_interface)
 757     {
 758       zlog_info ("RIPng INTERFACE ON %s", ifp->name);
 759
 760       /* Add interface wake up thread. */
 761       thread_add_timer(master, ripng_interface_wakeup, ifp, 1,
 762                        &ri->t_wakeup);
 763
 764       ripng_connect_set (ifp, 1);
 765     }
 766   else
 767     {
 768       if (ri->running)
 769         {
 770           /* Might as well clean up the route table as well
 771            * ripng_if_down sets to 0 ri->running, and displays "turn off %s"
 772            **/
 773           ripng_if_down(ifp);
 774
 775           ripng_connect_set (ifp, 0);
 776         }
 777     }
 778 }
 779
 780 /* Set distribute list to all interfaces. */
 781 static void
 782 ripng_enable_apply_all (void)
 783 {
 784   struct interface *ifp;
 785   struct listnode *node;
 786
 787   for (ALL_LIST_ELEMENTS_RO (vrf_iflist (VRF_DEFAULT), node, ifp))
 788     ripng_enable_apply (ifp);
 789 }
 790
 791 /* Clear all network and neighbor configuration */
 792 void
 793 ripng_clean_network ()
 794 {
 795   unsigned int i;
 796   char *str;
 797   struct route_node *rn;
 798
 799   /* ripng_enable_network */
 800   for (rn = route_top (ripng_enable_network); rn; rn = route_next (rn))
 801     if (rn->info) {
 802       rn->info = NULL;
 803       route_unlock_node(rn);
 804     }
 805
 806   /* ripng_enable_if */
 807   for (i = 0; i < vector_active (ripng_enable_if); i++)
 808     if ((str = vector_slot (ripng_enable_if, i)) != NULL) {
 809       free (str);
 810       vector_slot (ripng_enable_if, i) = NULL;
 811     }
 812 }
 813
 814 /* Vector to store passive-interface name. */
 815 vector Vripng_passive_interface;
 816
 817 /* Utility function for looking up passive interface settings. */
 818 static int
 819 ripng_passive_interface_lookup (const char *ifname)
 820 {
 821   unsigned int i;
 822   char *str;
 823
 824   for (i = 0; i < vector_active (Vripng_passive_interface); i++)
 825     if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
 826       if (strcmp (str, ifname) == 0)
 827         return i;
 828   return -1;
 829 }
 830
 831 void
 832 ripng_passive_interface_apply (struct interface *ifp)
 833 {
 834   int ret;
 835   struct ripng_interface *ri;
 836
 837   ri = ifp->info;
 838
 839   ret = ripng_passive_interface_lookup (ifp->name);
 840   if (ret < 0)
 841     ri->passive = 0;
 842   else
 843     ri->passive = 1;
 844 }
 845
 846 static void
 847 ripng_passive_interface_apply_all (void)
 848 {
 849   struct interface *ifp;
 850   struct listnode *node;
 851
 852   for (ALL_LIST_ELEMENTS_RO (vrf_iflist (VRF_DEFAULT), node, ifp))
 853     ripng_passive_interface_apply (ifp);
 854 }
 855
 856 /* Passive interface. */
 857 static int
 858 ripng_passive_interface_set (struct vty *vty, const char *ifname)
 859 {
 860   if (ripng_passive_interface_lookup (ifname) >= 0)
 861     return CMD_WARNING;
 862
 863   vector_set (Vripng_passive_interface, strdup (ifname));
 864
 865   ripng_passive_interface_apply_all ();
 866
 867   return CMD_SUCCESS;
 868 }
 869
 870 static int
 871 ripng_passive_interface_unset (struct vty *vty, const char *ifname)
 872 {
 873   int i;
 874   char *str;
 875
 876   i = ripng_passive_interface_lookup (ifname);
 877   if (i < 0)
 878     return CMD_WARNING;
 879
 880   str = vector_slot (Vripng_passive_interface, i);
 881   free (str);
 882   vector_unset (Vripng_passive_interface, i);
 883
 884   ripng_passive_interface_apply_all ();
 885
 886   return CMD_SUCCESS;
 887 }
 888
 889 /* Free all configured RIP passive-interface settings. */
 890 void
 891 ripng_passive_interface_clean (void)
 892 {
 893   unsigned int i;
 894   char *str;
 895
 896   for (i = 0; i < vector_active (Vripng_passive_interface); i++)
 897     if ((str = vector_slot (Vripng_passive_interface, i)) != NULL)
 898       {
 899         free (str);
 900         vector_slot (Vripng_passive_interface, i) = NULL;
 901       }
 902   ripng_passive_interface_apply_all ();
 903 }
 904
 905 /* Write RIPng enable network and interface to the vty. */
 906 int
 907 ripng_network_write (struct vty *vty, int config_mode)
 908 {
 909   unsigned int i;
 910   const char *ifname;
 911   struct route_node *node;
 912   char buf[BUFSIZ];
 913
 914   /* Write enable network. */
 915   for (node = route_top (ripng_enable_network); node; node = route_next (node))
 916     if (node->info)
 917       {
 918         struct prefix *p = &node->p;
 919         vty_out (vty, "%s%s/%d\n",
 920                  config_mode ? " network " : "    ",
 921                  inet_ntop (p->family, &p->u.prefix, buf, BUFSIZ),
 922                  p->prefixlen);
 923
 924       }
 925
 926   /* Write enable interface. */
 927   for (i = 0; i < vector_active (ripng_enable_if); i++)
 928     if ((ifname = vector_slot (ripng_enable_if, i)) != NULL)
 929       vty_out (vty, "%s%s\n",
 930                config_mode ? " network " : "    ",
 931                ifname);
 932
 933   /* Write passive interface. */
 934   if (config_mode)
 935     for (i = 0; i < vector_active (Vripng_passive_interface); i++)
 936       if ((ifname = vector_slot (Vripng_passive_interface, i)) != NULL)
 937         vty_out (vty, " passive-interface %s\n", ifname);
 938
 939   return 0;
 940 }
 941
 942 /* RIPng enable on specified interface or matched network. */
 943 DEFUN (ripng_network,
 944        ripng_network_cmd,
 945        "network IF_OR_ADDR",
 946        "RIPng enable on specified interface or network.\n"
 947        "Interface or address\n")
 948 {
 949   int idx_if_or_addr = 1;
 950   int ret;
 951   struct prefix p;
 952
 953   ret = str2prefix (argv[idx_if_or_addr]->arg, &p);
 954
 955   /* Given string is IPv6 network or interface name. */
 956   if (ret)
 957     ret = ripng_enable_network_add (&p);
 958   else
 959     ret = ripng_enable_if_add (argv[idx_if_or_addr]->arg);
 960
 961   if (ret < 0)
 962     {
 963       vty_out (vty, "There is same network configuration %s\n",
 964                  argv[idx_if_or_addr]->arg);
 965       return CMD_WARNING;
 966     }
 967
 968   return CMD_SUCCESS;
 969 }
 970
 971 /* RIPng enable on specified interface or matched network. */
 972 DEFUN (no_ripng_network,
 973        no_ripng_network_cmd,
 974        "no network IF_OR_ADDR",
 975        NO_STR
 976        "RIPng enable on specified interface or network.\n"
 977        "Interface or address\n")
 978 {
 979   int idx_if_or_addr = 2;
 980   int ret;
 981   struct prefix p;
 982
 983   ret = str2prefix (argv[idx_if_or_addr]->arg, &p);
 984
 985   /* Given string is interface name. */
 986   if (ret)
 987     ret = ripng_enable_network_delete (&p);
 988   else
 989     ret = ripng_enable_if_delete (argv[idx_if_or_addr]->arg);
 990
 991   if (ret < 0)
 992     {
 993       vty_out (vty, "can't find network %s\n",argv[idx_if_or_addr]->arg);
 994       return CMD_WARNING;
 995     }
 996
 997   return CMD_SUCCESS;
 998 }
 999
1000 DEFUN (ipv6_ripng_split_horizon,
1001        ipv6_ripng_split_horizon_cmd,
1002        "ipv6 ripng split-horizon",
1003        IPV6_STR
1004        "Routing Information Protocol\n"
1005        "Perform split horizon\n")
1006 {
1007   VTY_DECLVAR_CONTEXT(interface, ifp);
1008   struct ripng_interface *ri;
1009
1010   ri = ifp->info;
1011
1012   ri->split_horizon = RIPNG_SPLIT_HORIZON;
1013   return CMD_SUCCESS;
1014 }
1015
1016 DEFUN (ipv6_ripng_split_horizon_poisoned_reverse,
1017        ipv6_ripng_split_horizon_poisoned_reverse_cmd,
1018        "ipv6 ripng split-horizon poisoned-reverse",
1019        IPV6_STR
1020        "Routing Information Protocol\n"
1021        "Perform split horizon\n"
1022        "With poisoned-reverse\n")
1023 {
1024   VTY_DECLVAR_CONTEXT(interface, ifp);
1025   struct ripng_interface *ri;
1026
1027   ri = ifp->info;
1028
1029   ri->split_horizon = RIPNG_SPLIT_HORIZON_POISONED_REVERSE;
1030   return CMD_SUCCESS;
1031 }
1032
1033 DEFUN (no_ipv6_ripng_split_horizon,
1034        no_ipv6_ripng_split_horizon_cmd,
1035        "no ipv6 ripng split-horizon [poisoned-reverse]",
1036        NO_STR
1037        IPV6_STR
1038        "Routing Information Protocol\n"
1039        "Perform split horizon\n"
1040        "With poisoned-reverse\n")
1041 {
1042   VTY_DECLVAR_CONTEXT(interface, ifp);
1043   struct ripng_interface *ri;
1044
1045   ri = ifp->info;
1046
1047   ri->split_horizon = RIPNG_NO_SPLIT_HORIZON;
1048   return CMD_SUCCESS;
1049 }
1050
1051 DEFUN (ripng_passive_interface,
1052        ripng_passive_interface_cmd,
1053        "passive-interface IFNAME",
1054        "Suppress routing updates on an interface\n"
1055        "Interface name\n")
1056 {
1057   int idx_ifname = 1;
1058   return ripng_passive_interface_set (vty, argv[idx_ifname]->arg);
1059 }
1060
1061 DEFUN (no_ripng_passive_interface,
1062        no_ripng_passive_interface_cmd,
1063        "no passive-interface IFNAME",
1064        NO_STR
1065        "Suppress routing updates on an interface\n"
1066        "Interface name\n")
1067 {
1068   int idx_ifname = 2;
1069   return ripng_passive_interface_unset (vty, argv[idx_ifname]->arg);
1070 }
1071
1072 static struct ripng_interface *
1073 ri_new (void)
1074 {
1075   struct ripng_interface *ri;
1076   ri = XCALLOC (MTYPE_IF, sizeof (struct ripng_interface));
1077
1078   /* Set default split-horizon behavior.  If the interface is Frame
1079      Relay or SMDS is enabled, the default value for split-horizon is
1080      off.  But currently Zebra does detect Frame Relay or SMDS
1081      interface.  So all interface is set to split horizon.  */
1082   ri->split_horizon_default = RIPNG_SPLIT_HORIZON;
1083   ri->split_horizon = ri->split_horizon_default;
1084
1085   return ri;
1086 }
1087
1088 static int
1089 ripng_if_new_hook (struct interface *ifp)
1090 {
1091   ifp->info = ri_new ();
1092   return 0;
1093 }
1094
1095 /* Called when interface structure deleted. */
1096 static int
1097 ripng_if_delete_hook (struct interface *ifp)
1098 {
1099   XFREE (MTYPE_IF, ifp->info);
1100   ifp->info = NULL;
1101   return 0;
1102 }
1103
1104 /* Configuration write function for ripngd. */
1105 static int
1106 interface_config_write (struct vty *vty)
1107 {
1108   struct listnode *node;
1109   struct interface *ifp;
1110   struct ripng_interface *ri;
1111   int write = 0;
1112
1113   for (ALL_LIST_ELEMENTS_RO (vrf_iflist (VRF_DEFAULT), node, ifp))
1114     {
1115       ri = ifp->info;
1116
1117       /* Do not display the interface if there is no
1118        * configuration about it.
1119        **/
1120       if ((!ifp->desc) &&
1121           (ri->split_horizon == ri->split_horizon_default))
1122         continue;
1123
1124       vty_out (vty, "interface %s\n",ifp->name);
1125       if (ifp->desc)
1126         vty_out (vty, " description %s\n",ifp->desc);
1127
1128       /* Split horizon. */
1129       if (ri->split_horizon != ri->split_horizon_default)
1130         {
1131           switch (ri->split_horizon) {
1132           case RIPNG_SPLIT_HORIZON:
1133             vty_out (vty, " ipv6 ripng split-horizon\n");
1134             break;
1135           case RIPNG_SPLIT_HORIZON_POISONED_REVERSE:
1136             vty_out (vty," ipv6 ripng split-horizon poisoned-reverse\n");
1137             break;
1138           case RIPNG_NO_SPLIT_HORIZON:
1139           default:
1140             vty_out (vty, " no ipv6 ripng split-horizon\n");
1141             break;
1142           }
1143         }
1144
1145       vty_out (vty, "!\n");
1146
1147       write++;
1148     }
1149   return write;
1150 }
1151
1152 /* ripngd's interface node. */
1153 static struct cmd_node interface_node =
1154 {
1155   INTERFACE_NODE,
1156   "%s(config-if)# ",
1157   1 /* VTYSH */
1158 };
1159
1160 /* Initialization of interface. */
1161 void
1162 ripng_if_init ()
1163 {
1164   /* Interface initialize. */
1165   if_add_hook (IF_NEW_HOOK, ripng_if_new_hook);
1166   if_add_hook (IF_DELETE_HOOK, ripng_if_delete_hook);
1167
1168   /* RIPng enable network init. */
1169   ripng_enable_network = route_table_init ();
1170
1171   /* RIPng enable interface init. */
1172   ripng_enable_if = vector_init (1);
1173
1174   /* RIPng passive interface. */
1175   Vripng_passive_interface = vector_init (1);
1176
1177   /* Install interface node. */
1178   install_node (&interface_node, interface_config_write);
1179   if_cmd_init ();
1180
1181   install_element (RIPNG_NODE, &ripng_network_cmd);
1182   install_element (RIPNG_NODE, &no_ripng_network_cmd);
1183   install_element (RIPNG_NODE, &ripng_passive_interface_cmd);
1184   install_element (RIPNG_NODE, &no_ripng_passive_interface_cmd);
1185
1186   install_element (INTERFACE_NODE, &ipv6_ripng_split_horizon_cmd);
1187   install_element (INTERFACE_NODE, &ipv6_ripng_split_horizon_poisoned_reverse_cmd);
1188   install_element (INTERFACE_NODE, &no_ipv6_ripng_split_horizon_cmd);
1189 }