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 #include "zebra/zebra_errors.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
 211         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 212         if (!zvrf) {
 213                 flog_err(
 214                         EC_ZEBRA_VRF_NOT_FOUND,
 215                         "%s: Received Up for interface but no associated zvrf: %d",
 216                         __func__, ifp->vrf_id);
 217                 return;
 218         }
 219         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 220                 return;
 221
 222         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 223
 224         /* Apply mask to the network. */
 225         apply_mask(&p);
 226
 227         afi = family2afi(p.family);
 228
 229         switch (afi) {
 230         case AFI_IP:
 231                 /*
 232                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 233                  * address.
 234                  */
 235                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 236                         return;
 237                 break;
 238         case AFI_IP6:
 239 #ifndef GNU_LINUX
 240                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 241                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 242                         return;
 243 #endif
 244                 break;
 245         default:
 246                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 247                           "Received unknown AFI: %s", afi2str(afi));
 248                 return;
 249                 break;
 250         }
 251
 252         metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
 253                                 ifc->metric : ifp->metric;
 254         rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 255                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 256
 257         rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 258                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 259
 260         /* Schedule LSP forwarding entries for processing, if appropriate. */
 261         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 262                 if (IS_ZEBRA_DEBUG_MPLS) {
 263                         char buf[PREFIX_STRLEN];
 264
 265                         zlog_debug(
 266                                 "%u: IF %s IP %s address add/up, scheduling MPLS processing",
 267                                 zvrf->vrf->vrf_id, ifp->name,
 268                                 prefix2str(&p, buf, sizeof(buf)));
 269                 }
 270                 mpls_mark_lsps_for_processing(zvrf, &p);
 271         }
 272 }
 273
 274 /* Add connected IPv4 route to the interface. */
 275 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 276                         uint16_t prefixlen, struct in_addr *dest,
 277                         const char *label, uint32_t metric)
 278 {
 279         struct prefix_ipv4 *p;
 280         struct connected *ifc;
 281
 282         if (ipv4_martian(addr))
 283                 return;
 284
 285         /* Make connected structure. */
 286         ifc = connected_new();
 287         ifc->ifp = ifp;
 288         ifc->flags = flags;
 289         ifc->metric = metric;
 290         /* If we get a notification from the kernel,
 291          * we can safely assume the address is known to the kernel */
 292         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 293
 294         /* Allocate new connected address. */
 295         p = prefix_ipv4_new();
 296         p->family = AF_INET;
 297         p->prefix = *addr;
 298         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 299                                                          : prefixlen;
 300         ifc->address = (struct prefix *)p;
 301
 302         /* If there is a peer address. */
 303         if (CONNECTED_PEER(ifc)) {
 304                 /* validate the destination address */
 305                 if (dest) {
 306                         p = prefix_ipv4_new();
 307                         p->family = AF_INET;
 308                         p->prefix = *dest;
 309                         p->prefixlen = prefixlen;
 310                         ifc->destination = (struct prefix *)p;
 311
 312                         if (IPV4_ADDR_SAME(addr, dest))
 313                                 flog_warn(
 314                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 315                                         "warning: interface %s has same local and peer "
 316                                         "address %s, routing protocols may malfunction",
 317                                         ifp->name, inet_ntoa(*addr));
 318                 } else {
 319                         zlog_debug(
 320                                 "warning: %s called for interface %s "
 321                                 "with peer flag set, but no peer address supplied",
 322                                 __func__, ifp->name);
 323                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 324                 }
 325         }
 326
 327         /* no destination address was supplied */
 328         if (!dest && (prefixlen == IPV4_MAX_PREFIXLEN)
 329                 && if_is_pointopoint(ifp))
 330                 zlog_debug(
 331                         "warning: PtP interface %s with addr %s/%d needs a "
 332                         "peer address",
 333                         ifp->name, inet_ntoa(*addr), prefixlen);
 334
 335         /* Label of this address. */
 336         if (label)
 337                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 338
 339         /* For all that I know an IPv4 address is always ready when we receive
 340          * the notification. So it should be safe to set the REAL flag here. */
 341         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 342
 343         connected_update(ifp, ifc);
 344 }
 345
 346 void connected_down(struct interface *ifp, struct connected *ifc)
 347 {
 348         afi_t afi;
 349         struct prefix p;
 350         struct nexthop nh = {
 351                 .type = NEXTHOP_TYPE_IFINDEX,
 352                 .ifindex = ifp->ifindex,
 353                 .vrf_id = ifp->vrf_id,
 354         };
 355         struct zebra_vrf *zvrf;
 356
 357         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 358         if (!zvrf) {
 359                 flog_err(
 360                         EC_ZEBRA_VRF_NOT_FOUND,
 361                         "%s: Received Up for interface but no associated zvrf: %d",
 362                         __func__, ifp->vrf_id);
 363                 return;
 364         }
 365
 366         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 367                 return;
 368
 369         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 370
 371         /* Apply mask to the network. */
 372         apply_mask(&p);
 373
 374         afi = family2afi(p.family);
 375
 376         switch (afi) {
 377         case AFI_IP:
 378                 /*
 379                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 380                  *  address.
 381                  */
 382                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 383                         return;
 384                 break;
 385         case AFI_IP6:
 386                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 387                         return;
 388                 break;
 389         default:
 390                 zlog_warn("Unknown AFI: %s", afi2str(afi));
 391                 break;
 392         }
 393
 394         /*
 395          * Same logic as for connected_up(): push the changes into the
 396          * head.
 397          */
 398         rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 399                    0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 400
 401         rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 402                    0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 403
 404         /* Schedule LSP forwarding entries for processing, if appropriate. */
 405         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 406                 if (IS_ZEBRA_DEBUG_MPLS) {
 407                         char buf[PREFIX_STRLEN];
 408
 409                         zlog_debug(
 410                                 "%u: IF %s IP %s address down, scheduling MPLS processing",
 411                                 zvrf->vrf->vrf_id, ifp->name,
 412                                 prefix2str(&p, buf, sizeof(buf)));
 413                 }
 414                 mpls_mark_lsps_for_processing(zvrf, &p);
 415         }
 416 }
 417
 418 static void connected_delete_helper(struct connected *ifc, struct prefix *p)
 419 {
 420         struct interface *ifp;
 421
 422         if (!ifc)
 423                 return;
 424         ifp = ifc->ifp;
 425
 426         connected_withdraw(ifc);
 427
 428         /* Schedule LSP forwarding entries for processing, if appropriate. */
 429         if (ifp->vrf_id == VRF_DEFAULT) {
 430                 if (IS_ZEBRA_DEBUG_MPLS) {
 431                         char buf[PREFIX_STRLEN];
 432
 433                         zlog_debug(
 434                                 "%u: IF %s IP %s address delete, scheduling MPLS processing",
 435                                 ifp->vrf_id, ifp->name,
 436                                 prefix2str(p, buf, sizeof(buf)));
 437                 }
 438                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id), p);
 439         }
 440 }
 441
 442 /* Delete connected IPv4 route to the interface. */
 443 void connected_delete_ipv4(struct interface *ifp, int flags,
 444                            struct in_addr *addr, uint16_t prefixlen,
 445                            struct in_addr *dest)
 446 {
 447         struct prefix p, d;
 448         struct connected *ifc;
 449
 450         memset(&p, 0, sizeof(struct prefix));
 451         p.family = AF_INET;
 452         p.u.prefix4 = *addr;
 453         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 454                                                         : prefixlen;
 455
 456         if (dest) {
 457                 memset(&d, 0, sizeof(struct prefix));
 458                 d.family = AF_INET;
 459                 d.u.prefix4 = *dest;
 460                 d.prefixlen = prefixlen;
 461                 ifc = connected_check_ptp(ifp, &p, &d);
 462         } else
 463                 ifc = connected_check_ptp(ifp, &p, NULL);
 464
 465         connected_delete_helper(ifc, &p);
 466 }
 467
 468 /* Add connected IPv6 route to the interface. */
 469 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 470                         struct in6_addr *dest, uint16_t prefixlen,
 471                         const char *label, uint32_t metric)
 472 {
 473         struct prefix_ipv6 *p;
 474         struct connected *ifc;
 475
 476         if (ipv6_martian(addr))
 477                 return;
 478
 479         /* Make connected structure. */
 480         ifc = connected_new();
 481         ifc->ifp = ifp;
 482         ifc->flags = flags;
 483         ifc->metric = metric;
 484         /* If we get a notification from the kernel,
 485          * we can safely assume the address is known to the kernel */
 486         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 487
 488         /* Allocate new connected address. */
 489         p = prefix_ipv6_new();
 490         p->family = AF_INET6;
 491         IPV6_ADDR_COPY(&p->prefix, addr);
 492         p->prefixlen = prefixlen;
 493         ifc->address = (struct prefix *)p;
 494
 495         /* Add global ipv6 address to the RA prefix list */
 496         if (!IN6_IS_ADDR_LINKLOCAL(&p->prefix))
 497                 rtadv_add_prefix(ifp->info, p);
 498
 499         if (dest) {
 500                 p = prefix_ipv6_new();
 501                 p->family = AF_INET6;
 502                 IPV6_ADDR_COPY(&p->prefix, dest);
 503                 p->prefixlen = prefixlen;
 504                 ifc->destination = (struct prefix *)p;
 505         } else {
 506                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 507                         zlog_debug(
 508                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 509                                 __func__, ifp->name);
 510                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 511                 }
 512         }
 513
 514         /* Label of this address. */
 515         if (label)
 516                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 517
 518         /* On Linux, we only get here when DAD is complete, therefore we can set
 519          * ZEBRA_IFC_REAL.
 520          *
 521          * On BSD, there currently doesn't seem to be a way to check for
 522          * completion of
 523          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 524          * although DAD
 525          * might still be running.
 526          */
 527         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 528         connected_update(ifp, ifc);
 529 }
 530
 531 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 532                            struct in6_addr *dest, uint16_t prefixlen)
 533 {
 534         struct prefix p, d;
 535         struct connected *ifc;
 536
 537         memset(&p, 0, sizeof(struct prefix));
 538         p.family = AF_INET6;
 539         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 540         p.prefixlen = prefixlen;
 541
 542         /* Delete global ipv6 address from RA prefix list */
 543         if (!IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6))
 544                 rtadv_delete_prefix(ifp->info, &p);
 545
 546         if (dest) {
 547                 memset(&d, 0, sizeof(struct prefix));
 548                 d.family = AF_INET6;
 549                 IPV6_ADDR_COPY(&d.u.prefix6, dest);
 550                 d.prefixlen = prefixlen;
 551                 ifc = connected_check_ptp(ifp, &p, &d);
 552         } else
 553                 ifc = connected_check_ptp(ifp, &p, NULL);
 554
 555         connected_delete_helper(ifc, &p);
 556 }
 557
 558 int connected_is_unnumbered(struct interface *ifp)
 559 {
 560         struct connected *connected;
 561         struct listnode *node;
 562
 563         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 564                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 565                     && connected->address->family == AF_INET)
 566                         return CHECK_FLAG(connected->flags,
 567                                           ZEBRA_IFA_UNNUMBERED);
 568         }
 569         return 0;
 570 }