zebra/connected.c

   1 /*
   2  * Address linked list routine.
   3  * Copyright (C) 1997, 98 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 "prefix.h"
  25 #include "linklist.h"
  26 #include "if.h"
  27 #include "table.h"
  28 #include "rib.h"
  29 #include "table.h"
  30 #include "log.h"
  31 #include "memory.h"
  32 #include "zebra_memory.h"
  33
  34 #include "vty.h"
  35 #include "zebra/debug.h"
  36 #include "zebra/zserv.h"
  37 #include "zebra/redistribute.h"
  38 #include "zebra/interface.h"
  39 #include "zebra/connected.h"
  40 #include "zebra/rtadv.h"
  41 #include "zebra/zebra_mpls.h"
  42 #include "zebra/debug.h"
  43
  44 /* communicate the withdrawal of a connected address */
  45 static void connected_withdraw(struct connected *ifc)
  46 {
  47         if (!ifc)
  48                 return;
  49
  50         /* Update interface address information to protocol daemon. */
  51         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
  52                 zebra_interface_address_delete_update(ifc->ifp, ifc);
  53
  54                 if (ifc->address->family == AF_INET)
  55                         if_subnet_delete(ifc->ifp, ifc);
  56
  57                 if (ifc->address->family == AF_INET)
  58                         connected_down_ipv4(ifc->ifp, ifc);
  59                 else
  60                         connected_down_ipv6(ifc->ifp, ifc);
  61
  62                 UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
  63         }
  64
  65         /* The address is not in the kernel anymore, so clear the flag */
  66         UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
  67
  68         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
  69                 listnode_delete(ifc->ifp->connected, ifc);
  70                 connected_free(ifc);
  71         }
  72 }
  73
  74 static void connected_announce(struct interface *ifp, struct connected *ifc)
  75 {
  76         if (!ifc)
  77                 return;
  78
  79         if (!if_is_loopback(ifp) && ifc->address->family == AF_INET) {
  80                 if (ifc->address->prefixlen == 32)
  81                         SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  82                 else
  83                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  84         }
  85
  86         listnode_add(ifp->connected, ifc);
  87
  88         /* Update interface address information to protocol daemon. */
  89         if (ifc->address->family == AF_INET)
  90                 if_subnet_add(ifp, ifc);
  91
  92         zebra_interface_address_add_update(ifp, ifc);
  93
  94         if (if_is_operative(ifp)) {
  95                 if (ifc->address->family == AF_INET)
  96                         connected_up_ipv4(ifp, ifc);
  97                 else
  98                         connected_up_ipv6(ifp, ifc);
  99         }
 100 }
 101
 102 /* If same interface address is already exist... */
 103 struct connected *connected_check(struct interface *ifp, struct prefix *p)
 104 {
 105         struct connected *ifc;
 106         struct listnode *node;
 107
 108         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
 109                 if (prefix_same(ifc->address, p))
 110                         return ifc;
 111
 112         return NULL;
 113 }
 114
 115 /* Check if two ifc's describe the same address in the same state */
 116 static int connected_same(struct connected *ifc1, struct connected *ifc2)
 117 {
 118         if (ifc1->ifp != ifc2->ifp)
 119                 return 0;
 120
 121         if (ifc1->destination)
 122                 if (!ifc2->destination)
 123                         return 0;
 124         if (ifc2->destination)
 125                 if (!ifc1->destination)
 126                         return 0;
 127
 128         if (ifc1->destination && ifc2->destination)
 129                 if (!prefix_same(ifc1->destination, ifc2->destination))
 130                         return 0;
 131
 132         if (ifc1->flags != ifc2->flags)
 133                 return 0;
 134
 135         if (ifc1->conf != ifc2->conf)
 136                 return 0;
 137
 138         return 1;
 139 }
 140
 141 /* Handle changes to addresses and send the neccesary announcements
 142  * to clients. */
 143 static void connected_update(struct interface *ifp, struct connected *ifc)
 144 {
 145         struct connected *current;
 146
 147         /* Check same connected route. */
 148         if ((current = connected_check(ifp, (struct prefix *)ifc->address))) {
 149                 if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 150                         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 151
 152                 /* Avoid spurious withdraws, this might be just the kernel
 153                  * 'reflecting'
 154                  * back an address we have already added.
 155                  */
 156                 if (connected_same(current, ifc)) {
 157                         /* nothing to do */
 158                         connected_free(ifc);
 159                         return;
 160                 }
 161
 162                 /* Clear the configured flag on the old ifc, so it will be freed
 163                  * by
 164                  * connected withdraw. */
 165                 UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 166                 connected_withdraw(
 167                         current); /* implicit withdraw - freebsd does this */
 168         }
 169
 170         /* If the connected is new or has changed, announce it, if it is usable
 171          */
 172         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 173                 connected_announce(ifp, ifc);
 174 }
 175
 176 /* Called from if_up(). */
 177 void connected_up_ipv4(struct interface *ifp, struct connected *ifc)
 178 {
 179         struct prefix p;
 180
 181         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 182                 return;
 183
 184         PREFIX_COPY_IPV4((struct prefix_ipv4 *)&p, CONNECTED_PREFIX(ifc));
 185
 186         /* Apply mask to the network. */
 187         apply_mask(&p);
 188
 189         /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 190            address. */
 191         if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 192                 return;
 193
 194         rib_add(AFI_IP, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 195                 &p, NULL, NULL, NULL, ifp->ifindex, RT_TABLE_MAIN, ifp->metric,
 196                 0, 0);
 197
 198         rib_add(AFI_IP, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 199                 &p, NULL, NULL, NULL, ifp->ifindex, RT_TABLE_MAIN, ifp->metric,
 200                 0, 0);
 201
 202         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 203                 zlog_debug(
 204                         "%u: IF %s IPv4 address add/up, scheduling RIB processing",
 205                         ifp->vrf_id, ifp->name);
 206         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 207
 208         /* Schedule LSP forwarding entries for processing, if appropriate. */
 209         if (ifp->vrf_id == VRF_DEFAULT) {
 210                 if (IS_ZEBRA_DEBUG_MPLS)
 211                         zlog_debug(
 212                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 213                                 ifp->vrf_id, ifp->name);
 214                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 215         }
 216 }
 217
 218 /* Add connected IPv4 route to the interface. */
 219 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 220                         u_char prefixlen, struct in_addr *broad,
 221                         const char *label)
 222 {
 223         struct prefix_ipv4 *p;
 224         struct connected *ifc;
 225
 226         if (ipv4_martian(addr))
 227                 return;
 228
 229         /* Make connected structure. */
 230         ifc = connected_new();
 231         ifc->ifp = ifp;
 232         ifc->flags = flags;
 233         /* If we get a notification from the kernel,
 234          * we can safely assume the address is known to the kernel */
 235         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 236
 237         /* Allocate new connected address. */
 238         p = prefix_ipv4_new();
 239         p->family = AF_INET;
 240         p->prefix = *addr;
 241         p->prefixlen = prefixlen;
 242         ifc->address = (struct prefix *)p;
 243
 244         /* If there is broadcast or peer address. */
 245         if (broad) {
 246                 p = prefix_ipv4_new();
 247                 p->family = AF_INET;
 248                 p->prefix = *broad;
 249                 p->prefixlen = prefixlen;
 250                 ifc->destination = (struct prefix *)p;
 251
 252                 /* validate the destination address */
 253                 if (CONNECTED_PEER(ifc)) {
 254                         if (IPV4_ADDR_SAME(addr, broad))
 255                                 zlog_warn(
 256                                         "warning: interface %s has same local and peer "
 257                                         "address %s, routing protocols may malfunction",
 258                                         ifp->name, inet_ntoa(*addr));
 259                 } else {
 260                         if (broad->s_addr
 261                             != ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
 262                                 char buf[2][INET_ADDRSTRLEN];
 263                                 struct in_addr bcalc;
 264                                 bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
 265                                                                    prefixlen);
 266                                 zlog_warn(
 267                                         "warning: interface %s broadcast addr %s/%d != "
 268                                         "calculated %s, routing protocols may malfunction",
 269                                         ifp->name,
 270                                         inet_ntop(AF_INET, broad, buf[0],
 271                                                   sizeof(buf[0])),
 272                                         prefixlen,
 273                                         inet_ntop(AF_INET, &bcalc, buf[1],
 274                                                   sizeof(buf[1])));
 275                         }
 276                 }
 277
 278         } else {
 279                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 280                         zlog_warn(
 281                                 "warning: %s called for interface %s "
 282                                 "with peer flag set, but no peer address supplied",
 283                                 __func__, ifp->name);
 284                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 285                 }
 286
 287                 /* no broadcast or destination address was supplied */
 288                 if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
 289                         zlog_warn(
 290                                 "warning: PtP interface %s with addr %s/%d needs a "
 291                                 "peer address",
 292                                 ifp->name, inet_ntoa(*addr), prefixlen);
 293         }
 294
 295         /* Label of this address. */
 296         if (label)
 297                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 298
 299         /* For all that I know an IPv4 address is always ready when we receive
 300          * the notification. So it should be safe to set the REAL flag here. */
 301         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 302
 303         connected_update(ifp, ifc);
 304 }
 305
 306 void connected_down_ipv4(struct interface *ifp, struct connected *ifc)
 307 {
 308         struct prefix p;
 309
 310         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 311                 return;
 312
 313         PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
 314
 315         /* Apply mask to the network. */
 316         apply_mask(&p);
 317
 318         /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 319            address. */
 320         if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 321                 return;
 322
 323         /* Same logic as for connected_up_ipv4(): push the changes into the
 324          * head. */
 325         rib_delete(AFI_IP, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 326                    &p, NULL, NULL, ifp->ifindex, 0);
 327
 328         rib_delete(AFI_IP, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 329                    0, &p, NULL, NULL, ifp->ifindex, 0);
 330
 331         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 332                 zlog_debug(
 333                         "%u: IF %s IPv4 address down, scheduling RIB processing",
 334                         ifp->vrf_id, ifp->name);
 335
 336         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 337
 338         /* Schedule LSP forwarding entries for processing, if appropriate. */
 339         if (ifp->vrf_id == VRF_DEFAULT) {
 340                 if (IS_ZEBRA_DEBUG_MPLS)
 341                         zlog_debug(
 342                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 343                                 ifp->vrf_id, ifp->name);
 344                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 345         }
 346 }
 347
 348 /* Delete connected IPv4 route to the interface. */
 349 void connected_delete_ipv4(struct interface *ifp, int flags,
 350                            struct in_addr *addr, u_char prefixlen,
 351                            struct in_addr *broad)
 352 {
 353         struct prefix_ipv4 p;
 354         struct connected *ifc;
 355
 356         memset(&p, 0, sizeof(struct prefix_ipv4));
 357         p.family = AF_INET;
 358         p.prefix = *addr;
 359         p.prefixlen = prefixlen;
 360
 361         ifc = connected_check(ifp, (struct prefix *)&p);
 362         if (!ifc)
 363                 return;
 364
 365         connected_withdraw(ifc);
 366
 367         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 368                 zlog_debug(
 369                         "%u: IF %s IPv4 address del, scheduling RIB processing",
 370                         ifp->vrf_id, ifp->name);
 371
 372         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 373
 374         /* Schedule LSP forwarding entries for processing, if appropriate. */
 375         if (ifp->vrf_id == VRF_DEFAULT) {
 376                 if (IS_ZEBRA_DEBUG_MPLS)
 377                         zlog_debug(
 378                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 379                                 ifp->vrf_id, ifp->name);
 380                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 381         }
 382 }
 383
 384 void connected_up_ipv6(struct interface *ifp, struct connected *ifc)
 385 {
 386         struct prefix p;
 387
 388         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 389                 return;
 390
 391         PREFIX_COPY_IPV6((struct prefix_ipv6 *)&p, CONNECTED_PREFIX(ifc));
 392
 393         /* Apply mask to the network. */
 394         apply_mask(&p);
 395
 396 #ifndef LINUX
 397         /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 398         if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 399                 return;
 400 #endif
 401
 402         rib_add(AFI_IP6, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 403                 &p, NULL, NULL, NULL, ifp->ifindex, RT_TABLE_MAIN, ifp->metric,
 404                 0, 0);
 405
 406         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 407                 zlog_debug(
 408                         "%u: IF %s IPv6 address down, scheduling RIB processing",
 409                         ifp->vrf_id, ifp->name);
 410
 411         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 412
 413         /* Schedule LSP forwarding entries for processing, if appropriate. */
 414         if (ifp->vrf_id == VRF_DEFAULT) {
 415                 if (IS_ZEBRA_DEBUG_MPLS)
 416                         zlog_debug(
 417                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 418                                 ifp->vrf_id, ifp->name);
 419                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 420         }
 421 }
 422
 423 /* Add connected IPv6 route to the interface. */
 424 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 425                         u_char prefixlen, struct in6_addr *broad,
 426                         const char *label)
 427 {
 428         struct prefix_ipv6 *p;
 429         struct connected *ifc;
 430
 431         if (ipv6_martian(addr))
 432                 return;
 433
 434         /* Make connected structure. */
 435         ifc = connected_new();
 436         ifc->ifp = ifp;
 437         ifc->flags = flags;
 438         /* If we get a notification from the kernel,
 439          * we can safely assume the address is known to the kernel */
 440         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 441
 442         /* Allocate new connected address. */
 443         p = prefix_ipv6_new();
 444         p->family = AF_INET6;
 445         IPV6_ADDR_COPY(&p->prefix, addr);
 446         p->prefixlen = prefixlen;
 447         ifc->address = (struct prefix *)p;
 448
 449         /* If there is broadcast or peer address. */
 450         if (broad) {
 451                 if (IN6_IS_ADDR_UNSPECIFIED(broad))
 452                         zlog_warn(
 453                                 "warning: %s called for interface %s with unspecified "
 454                                 "destination address; ignoring!",
 455                                 __func__, ifp->name);
 456                 else {
 457                         p = prefix_ipv6_new();
 458                         p->family = AF_INET6;
 459                         IPV6_ADDR_COPY(&p->prefix, broad);
 460                         p->prefixlen = prefixlen;
 461                         ifc->destination = (struct prefix *)p;
 462                 }
 463         }
 464         if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER) && !ifc->destination) {
 465                 zlog_warn(
 466                         "warning: %s called for interface %s "
 467                         "with peer flag set, but no peer address supplied",
 468                         __func__, ifp->name);
 469                 UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 470         }
 471
 472         /* Label of this address. */
 473         if (label)
 474                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 475
 476         /* On Linux, we only get here when DAD is complete, therefore we can set
 477          * ZEBRA_IFC_REAL.
 478          *
 479          * On BSD, there currently doesn't seem to be a way to check for
 480          * completion of
 481          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 482          * although DAD
 483          * might still be running.
 484          */
 485         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 486         connected_update(ifp, ifc);
 487 }
 488
 489 void connected_down_ipv6(struct interface *ifp, struct connected *ifc)
 490 {
 491         struct prefix p;
 492
 493         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 494                 return;
 495
 496         PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
 497
 498         apply_mask(&p);
 499
 500         if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 501                 return;
 502
 503         rib_delete(AFI_IP6, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 504                    0, &p, NULL, NULL, ifp->ifindex, 0);
 505
 506         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 507                 zlog_debug(
 508                         "%u: IF %s IPv6 address down, scheduling RIB processing",
 509                         ifp->vrf_id, ifp->name);
 510
 511         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 512
 513         /* Schedule LSP forwarding entries for processing, if appropriate. */
 514         if (ifp->vrf_id == VRF_DEFAULT) {
 515                 if (IS_ZEBRA_DEBUG_MPLS)
 516                         zlog_debug(
 517                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 518                                 ifp->vrf_id, ifp->name);
 519                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 520         }
 521 }
 522
 523 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 524                            u_char prefixlen, struct in6_addr *broad)
 525 {
 526         struct prefix_ipv6 p;
 527         struct connected *ifc;
 528
 529         memset(&p, 0, sizeof(struct prefix_ipv6));
 530         p.family = AF_INET6;
 531         memcpy(&p.prefix, address, sizeof(struct in6_addr));
 532         p.prefixlen = prefixlen;
 533
 534         ifc = connected_check(ifp, (struct prefix *)&p);
 535         if (!ifc)
 536                 return;
 537
 538         connected_withdraw(ifc);
 539
 540         if (IS_ZEBRA_DEBUG_RIB_DETAILED)
 541                 zlog_debug(
 542                         "%u: IF %s IPv6 address del, scheduling RIB processing",
 543                         ifp->vrf_id, ifp->name);
 544
 545         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 546
 547         /* Schedule LSP forwarding entries for processing, if appropriate. */
 548         if (ifp->vrf_id == VRF_DEFAULT) {
 549                 if (IS_ZEBRA_DEBUG_MPLS)
 550                         zlog_debug(
 551                                 "%u: IF %s IPv4 address add/up, scheduling MPLS processing",
 552                                 ifp->vrf_id, ifp->name);
 553                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 554         }
 555 }
 556
 557 int connected_is_unnumbered(struct interface *ifp)
 558 {
 559         struct connected *connected;
 560         struct listnode *node;
 561
 562         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 563                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 564                     && connected->address->family == AF_INET)
 565                         return CHECK_FLAG(connected->flags,
 566                                           ZEBRA_IFA_UNNUMBERED);
 567         }
 568         return 0;
 569 }