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
  33 #include "vty.h"
  34 #include "zebra/debug.h"
  35 #include "zebra/zserv.h"
  36 #include "zebra/redistribute.h"
  37 #include "zebra/interface.h"
  38 #include "zebra/connected.h"
  39 #include "zebra/rtadv.h"
  40 #include "zebra/zebra_mpls.h"
  41 #include "zebra/debug.h"
  42 #include "zebra/zebra_errors.h"
  43 #include "zebra/zebra_router.h"
  44
  45 /* communicate the withdrawal of a connected address */
  46 static void connected_withdraw(struct connected *ifc)
  47 {
  48         if (!ifc)
  49                 return;
  50
  51         /* Update interface address information to protocol daemon. */
  52         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
  53                 zebra_interface_address_delete_update(ifc->ifp, ifc);
  54
  55                 if (ifc->address->family == AF_INET)
  56                         if_subnet_delete(ifc->ifp, ifc);
  57
  58                 connected_down(ifc->ifp, ifc);
  59
  60                 UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
  61         }
  62
  63         /* The address is not in the kernel anymore, so clear the flag */
  64         UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
  65
  66         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
  67                 listnode_delete(ifc->ifp->connected, ifc);
  68                 connected_free(&ifc);
  69         }
  70 }
  71
  72 static void connected_announce(struct interface *ifp, struct connected *ifc)
  73 {
  74         if (!ifc)
  75                 return;
  76
  77         if (!if_is_loopback(ifp) && ifc->address->family == AF_INET &&
  78             !IS_ZEBRA_IF_VRF(ifp)) {
  79                 if (ifc->address->prefixlen == 32)
  80                         SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  81                 else
  82                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  83         }
  84
  85         listnode_add(ifp->connected, ifc);
  86
  87         /* Update interface address information to protocol daemon. */
  88         if (ifc->address->family == AF_INET)
  89                 if_subnet_add(ifp, ifc);
  90
  91         zebra_interface_address_add_update(ifp, ifc);
  92
  93         if (if_is_operative(ifp)) {
  94                 connected_up(ifp, ifc);
  95         }
  96 }
  97
  98 /* If same interface address is already exist... */
  99 struct connected *connected_check(struct interface *ifp,
 100                                   union prefixconstptr pu)
 101 {
 102         const struct prefix *p = pu.p;
 103         struct connected *ifc;
 104         struct listnode *node;
 105
 106         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
 107                 if (prefix_same(ifc->address, p))
 108                         return ifc;
 109
 110         return NULL;
 111 }
 112
 113 /* same, but with peer address */
 114 struct connected *connected_check_ptp(struct interface *ifp,
 115                                       union prefixconstptr pu,
 116                                       union prefixconstptr du)
 117 {
 118         const struct prefix *p = pu.p;
 119         const struct prefix *d = du.p;
 120         struct connected *ifc;
 121         struct listnode *node;
 122
 123         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 124                 if (!prefix_same(ifc->address, p))
 125                         continue;
 126                 if (!CONNECTED_PEER(ifc) && !d)
 127                         return ifc;
 128                 if (CONNECTED_PEER(ifc) && d
 129                     && prefix_same(ifc->destination, d))
 130                         return ifc;
 131         }
 132
 133         return NULL;
 134 }
 135
 136 /* Check if two ifc's describe the same address in the same state */
 137 static int connected_same(struct connected *ifc1, struct connected *ifc2)
 138 {
 139         if (ifc1->ifp != ifc2->ifp)
 140                 return 0;
 141
 142         if (ifc1->flags != ifc2->flags)
 143                 return 0;
 144
 145         if (ifc1->conf != ifc2->conf)
 146                 return 0;
 147
 148         if (ifc1->destination)
 149                 if (!ifc2->destination)
 150                         return 0;
 151         if (ifc2->destination)
 152                 if (!ifc1->destination)
 153                         return 0;
 154
 155         if (ifc1->destination && ifc2->destination)
 156                 if (!prefix_same(ifc1->destination, ifc2->destination))
 157                         return 0;
 158
 159         return 1;
 160 }
 161
 162 /* Handle changes to addresses and send the neccesary announcements
 163  * to clients. */
 164 static void connected_update(struct interface *ifp, struct connected *ifc)
 165 {
 166         struct connected *current;
 167
 168         /* Check same connected route. */
 169         current = connected_check_ptp(ifp, ifc->address, ifc->destination);
 170         if (current) {
 171                 if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 172                         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 173
 174                 /* Avoid spurious withdraws, this might be just the kernel
 175                  * 'reflecting'
 176                  * back an address we have already added.
 177                  */
 178                 if (connected_same(current, ifc)) {
 179                         /* nothing to do */
 180                         connected_free(&ifc);
 181                         return;
 182                 }
 183
 184                 /* Clear the configured flag on the old ifc, so it will be freed
 185                  * by
 186                  * connected withdraw. */
 187                 UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 188                 connected_withdraw(
 189                         current); /* implicit withdraw - freebsd does this */
 190         }
 191
 192         /* If the connected is new or has changed, announce it, if it is usable
 193          */
 194         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 195                 connected_announce(ifp, ifc);
 196 }
 197
 198 /* Called from if_up(). */
 199 void connected_up(struct interface *ifp, struct connected *ifc)
 200 {
 201         afi_t afi;
 202         struct prefix p = {0};
 203         struct nexthop nh = {
 204                 .type = NEXTHOP_TYPE_IFINDEX,
 205                 .ifindex = ifp->ifindex,
 206                 .vrf_id = ifp->vrf_id,
 207         };
 208         struct zebra_vrf *zvrf;
 209         uint32_t metric;
 210         uint32_t flags = 0;
 211         uint32_t count = 0;
 212         struct listnode *cnode;
 213         struct connected *c;
 214
 215         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 216         if (!zvrf) {
 217                 flog_err(
 218                         EC_ZEBRA_VRF_NOT_FOUND,
 219                         "%s: Received Up for interface but no associated zvrf: %d",
 220                         __func__, ifp->vrf_id);
 221                 return;
 222         }
 223         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 224                 return;
 225
 226         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 227
 228         /* Apply mask to the network. */
 229         apply_mask(&p);
 230
 231         afi = family2afi(p.family);
 232
 233         switch (afi) {
 234         case AFI_IP:
 235                 /*
 236                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 237                  * address.
 238                  */
 239                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 240                         return;
 241                 break;
 242         case AFI_IP6:
 243 #ifndef GNU_LINUX
 244                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 245                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 246                         return;
 247 #endif
 248                 break;
 249         default:
 250                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 251                           "Received unknown AFI: %s", afi2str(afi));
 252                 return;
 253                 break;
 254         }
 255
 256         metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
 257                                 ifc->metric : ifp->metric;
 258
 259         /*
 260          * Since we are hand creating the connected routes
 261          * in our main routing table, *if* we are working
 262          * in an offloaded environment then we need to
 263          * pretend like the route is offloaded so everything
 264          * else will work
 265          */
 266         if (zrouter.asic_offloaded)
 267                 flags |= ZEBRA_FLAG_OFFLOADED;
 268
 269         /*
 270          * It's possible to add the same network and mask
 271          * to an interface over and over.  This would
 272          * result in an equivalent number of connected
 273          * routes.  Just add one connected route in
 274          * for all the addresses on an interface that
 275          * resolve to the same network and mask
 276          */
 277         for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) {
 278                 struct prefix cp;
 279
 280                 PREFIX_COPY(&cp, CONNECTED_PREFIX(c));
 281                 apply_mask(&cp);
 282
 283                 if (prefix_same(&cp, &p))
 284                         count++;
 285
 286                 if (count >= 2)
 287                         return;
 288         }
 289
 290         rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 291                 flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 292
 293         rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 294                 flags, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 295
 296         /* Schedule LSP forwarding entries for processing, if appropriate. */
 297         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 298                 if (IS_ZEBRA_DEBUG_MPLS)
 299                         zlog_debug(
 300                                 "%u: IF %s IP %pFX address add/up, scheduling MPLS processing",
 301                                 zvrf->vrf->vrf_id, ifp->name, &p);
 302                 mpls_mark_lsps_for_processing(zvrf, &p);
 303         }
 304 }
 305
 306 /* Add connected IPv4 route to the interface. */
 307 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 308                         uint16_t prefixlen, struct in_addr *dest,
 309                         const char *label, uint32_t metric)
 310 {
 311         struct prefix_ipv4 *p;
 312         struct connected *ifc;
 313
 314         if (ipv4_martian(addr))
 315                 return;
 316
 317         /* Make connected structure. */
 318         ifc = connected_new();
 319         ifc->ifp = ifp;
 320         ifc->flags = flags;
 321         ifc->metric = metric;
 322         /* If we get a notification from the kernel,
 323          * we can safely assume the address is known to the kernel */
 324         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 325
 326         /* Allocate new connected address. */
 327         p = prefix_ipv4_new();
 328         p->family = AF_INET;
 329         p->prefix = *addr;
 330         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 331                                                          : prefixlen;
 332         ifc->address = (struct prefix *)p;
 333
 334         /* If there is a peer address. */
 335         if (CONNECTED_PEER(ifc)) {
 336                 /* validate the destination address */
 337                 if (dest) {
 338                         p = prefix_ipv4_new();
 339                         p->family = AF_INET;
 340                         p->prefix = *dest;
 341                         p->prefixlen = prefixlen;
 342                         ifc->destination = (struct prefix *)p;
 343
 344                         if (IPV4_ADDR_SAME(addr, dest))
 345                                 flog_warn(
 346                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 347                                         "interface %s has same local and peer address %pI4, routing protocols may malfunction",
 348                                         ifp->name, addr);
 349                 } else {
 350                         zlog_debug(
 351                                 "%s called for interface %s with peer flag set, but no peer address supplied",
 352                                 __func__, ifp->name);
 353                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 354                 }
 355         }
 356
 357         /* no destination address was supplied */
 358         if (!dest && (prefixlen == IPV4_MAX_PREFIXLEN)
 359                 && if_is_pointopoint(ifp))
 360                 zlog_debug(
 361                         "PtP interface %s with addr %pI4/%d needs a peer address",
 362                         ifp->name, addr, prefixlen);
 363
 364         /* Label of this address. */
 365         if (label)
 366                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 367
 368         /* For all that I know an IPv4 address is always ready when we receive
 369          * the notification. So it should be safe to set the REAL flag here. */
 370         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 371
 372         connected_update(ifp, ifc);
 373 }
 374
 375 void connected_down(struct interface *ifp, struct connected *ifc)
 376 {
 377         afi_t afi;
 378         struct prefix p;
 379         struct nexthop nh = {
 380                 .type = NEXTHOP_TYPE_IFINDEX,
 381                 .ifindex = ifp->ifindex,
 382                 .vrf_id = ifp->vrf_id,
 383         };
 384         struct zebra_vrf *zvrf;
 385         uint32_t count = 0;
 386         struct listnode *cnode;
 387         struct connected *c;
 388
 389         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 390         if (!zvrf) {
 391                 flog_err(
 392                         EC_ZEBRA_VRF_NOT_FOUND,
 393                         "%s: Received Up for interface but no associated zvrf: %d",
 394                         __func__, ifp->vrf_id);
 395                 return;
 396         }
 397
 398         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 399                 return;
 400
 401         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 402
 403         /* Apply mask to the network. */
 404         apply_mask(&p);
 405
 406         afi = family2afi(p.family);
 407
 408         switch (afi) {
 409         case AFI_IP:
 410                 /*
 411                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 412                  *  address.
 413                  */
 414                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 415                         return;
 416                 break;
 417         case AFI_IP6:
 418                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 419                         return;
 420                 break;
 421         default:
 422                 zlog_warn("Unknown AFI: %s", afi2str(afi));
 423                 break;
 424         }
 425
 426         /*
 427          * It's possible to have X number of addresses
 428          * on a interface that all resolve to the same
 429          * network and mask.  Find them and just
 430          * allow the deletion when are removing the last
 431          * one.
 432          */
 433         for (ALL_LIST_ELEMENTS_RO(ifp->connected, cnode, c)) {
 434                 struct prefix cp;
 435
 436                 PREFIX_COPY(&cp, CONNECTED_PREFIX(c));
 437                 apply_mask(&cp);
 438
 439                 if (prefix_same(&p, &cp))
 440                         count++;
 441
 442                 if (count >= 2)
 443                         return;
 444         }
 445
 446         /*
 447          * Same logic as for connected_up(): push the changes into the
 448          * head.
 449          */
 450         rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 451                    0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 452
 453         rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 454                    0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 455
 456         /* Schedule LSP forwarding entries for processing, if appropriate. */
 457         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 458                 if (IS_ZEBRA_DEBUG_MPLS)
 459                         zlog_debug(
 460                                 "%u: IF %s IP %pFX address down, scheduling MPLS processing",
 461                                 zvrf->vrf->vrf_id, ifp->name, &p);
 462                 mpls_mark_lsps_for_processing(zvrf, &p);
 463         }
 464 }
 465
 466 static void connected_delete_helper(struct connected *ifc, struct prefix *p)
 467 {
 468         struct interface *ifp;
 469
 470         if (!ifc)
 471                 return;
 472         ifp = ifc->ifp;
 473
 474         connected_withdraw(ifc);
 475
 476         /* Schedule LSP forwarding entries for processing, if appropriate. */
 477         if (ifp->vrf_id == VRF_DEFAULT) {
 478                 if (IS_ZEBRA_DEBUG_MPLS)
 479                         zlog_debug(
 480                                 "%u: IF %s IP %pFX address delete, scheduling MPLS processing",
 481                                 ifp->vrf_id, ifp->name, p);
 482                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id), p);
 483         }
 484 }
 485
 486 /* Delete connected IPv4 route to the interface. */
 487 void connected_delete_ipv4(struct interface *ifp, int flags,
 488                            struct in_addr *addr, uint16_t prefixlen,
 489                            struct in_addr *dest)
 490 {
 491         struct prefix p, d;
 492         struct connected *ifc;
 493
 494         memset(&p, 0, sizeof(struct prefix));
 495         p.family = AF_INET;
 496         p.u.prefix4 = *addr;
 497         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 498                                                         : prefixlen;
 499
 500         if (dest) {
 501                 memset(&d, 0, sizeof(struct prefix));
 502                 d.family = AF_INET;
 503                 d.u.prefix4 = *dest;
 504                 d.prefixlen = prefixlen;
 505                 ifc = connected_check_ptp(ifp, &p, &d);
 506         } else
 507                 ifc = connected_check_ptp(ifp, &p, NULL);
 508
 509         connected_delete_helper(ifc, &p);
 510 }
 511
 512 /* Add connected IPv6 route to the interface. */
 513 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 514                         struct in6_addr *dest, uint16_t prefixlen,
 515                         const char *label, uint32_t metric)
 516 {
 517         struct prefix_ipv6 *p;
 518         struct connected *ifc;
 519
 520         if (ipv6_martian(addr))
 521                 return;
 522
 523         /* Make connected structure. */
 524         ifc = connected_new();
 525         ifc->ifp = ifp;
 526         ifc->flags = flags;
 527         ifc->metric = metric;
 528         /* If we get a notification from the kernel,
 529          * we can safely assume the address is known to the kernel */
 530         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 531
 532         /* Allocate new connected address. */
 533         p = prefix_ipv6_new();
 534         p->family = AF_INET6;
 535         IPV6_ADDR_COPY(&p->prefix, addr);
 536         p->prefixlen = prefixlen;
 537         ifc->address = (struct prefix *)p;
 538
 539         /* Add global ipv6 address to the RA prefix list */
 540         if (!IN6_IS_ADDR_LINKLOCAL(&p->prefix))
 541                 rtadv_add_prefix(ifp->info, p);
 542
 543         if (dest) {
 544                 p = prefix_ipv6_new();
 545                 p->family = AF_INET6;
 546                 IPV6_ADDR_COPY(&p->prefix, dest);
 547                 p->prefixlen = prefixlen;
 548                 ifc->destination = (struct prefix *)p;
 549         } else {
 550                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 551                         zlog_debug(
 552                                 "%s called for interface %s with peer flag set, but no peer address supplied",
 553                                 __func__, ifp->name);
 554                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 555                 }
 556         }
 557
 558         /* Label of this address. */
 559         if (label)
 560                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 561
 562         /* On Linux, we only get here when DAD is complete, therefore we can set
 563          * ZEBRA_IFC_REAL.
 564          *
 565          * On BSD, there currently doesn't seem to be a way to check for
 566          * completion of
 567          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 568          * although DAD
 569          * might still be running.
 570          */
 571         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 572         connected_update(ifp, ifc);
 573 }
 574
 575 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 576                            struct in6_addr *dest, uint16_t prefixlen)
 577 {
 578         struct prefix p, d;
 579         struct connected *ifc;
 580
 581         memset(&p, 0, sizeof(struct prefix));
 582         p.family = AF_INET6;
 583         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 584         p.prefixlen = prefixlen;
 585
 586         /* Delete global ipv6 address from RA prefix list */
 587         if (!IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6))
 588                 rtadv_delete_prefix(ifp->info, &p);
 589
 590         if (dest) {
 591                 memset(&d, 0, sizeof(struct prefix));
 592                 d.family = AF_INET6;
 593                 IPV6_ADDR_COPY(&d.u.prefix6, dest);
 594                 d.prefixlen = prefixlen;
 595                 ifc = connected_check_ptp(ifp, &p, &d);
 596         } else
 597                 ifc = connected_check_ptp(ifp, &p, NULL);
 598
 599         connected_delete_helper(ifc, &p);
 600 }
 601
 602 int connected_is_unnumbered(struct interface *ifp)
 603 {
 604         struct connected *connected;
 605         struct listnode *node;
 606
 607         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 608                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 609                     && connected->address->family == AF_INET)
 610                         return CHECK_FLAG(connected->flags,
 611                                           ZEBRA_IFA_UNNUMBERED);
 612         }
 613         return 0;
 614 }