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(EC_ZEBRA_VRF_NOT_FOUND,
 214                          "%s: Received Up for interface but no associated zvrf: %d",
 215                          __PRETTY_FUNCTION__, ifp->vrf_id);
 216                 return;
 217         }
 218         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 219                 return;
 220
 221         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 222
 223         /* Apply mask to the network. */
 224         apply_mask(&p);
 225
 226         afi = family2afi(p.family);
 227
 228         switch (afi) {
 229         case AFI_IP:
 230                 /*
 231                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 232                  * address.
 233                  */
 234                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 235                         return;
 236                 break;
 237         case AFI_IP6:
 238 #ifndef GNU_LINUX
 239                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 240                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 241                         return;
 242 #endif
 243                 break;
 244         default:
 245                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 246                           "Received unknown AFI: %s", afi2str(afi));
 247                 return;
 248                 break;
 249         }
 250
 251         metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
 252                                 ifc->metric : ifp->metric;
 253         rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 254                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 255
 256         rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 257                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 258
 259         /* Schedule LSP forwarding entries for processing, if appropriate. */
 260         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 261                 if (IS_ZEBRA_DEBUG_MPLS) {
 262                         char buf[PREFIX_STRLEN];
 263
 264                         zlog_debug(
 265                                 "%u: IF %s IP %s address add/up, scheduling MPLS processing",
 266                                 zvrf->vrf->vrf_id, ifp->name,
 267                                 prefix2str(&p, buf, sizeof(buf)));
 268                 }
 269                 mpls_mark_lsps_for_processing(zvrf, &p);
 270         }
 271 }
 272
 273 /* Add connected IPv4 route to the interface. */
 274 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 275                         uint16_t prefixlen, struct in_addr *dest,
 276                         const char *label, uint32_t metric)
 277 {
 278         struct prefix_ipv4 *p;
 279         struct connected *ifc;
 280
 281         if (ipv4_martian(addr))
 282                 return;
 283
 284         /* Make connected structure. */
 285         ifc = connected_new();
 286         ifc->ifp = ifp;
 287         ifc->flags = flags;
 288         ifc->metric = metric;
 289         /* If we get a notification from the kernel,
 290          * we can safely assume the address is known to the kernel */
 291         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 292
 293         /* Allocate new connected address. */
 294         p = prefix_ipv4_new();
 295         p->family = AF_INET;
 296         p->prefix = *addr;
 297         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 298                                                          : prefixlen;
 299         ifc->address = (struct prefix *)p;
 300
 301         /* If there is a peer address. */
 302         if (CONNECTED_PEER(ifc)) {
 303                 /* validate the destination address */
 304                 if (dest) {
 305                         p = prefix_ipv4_new();
 306                         p->family = AF_INET;
 307                         p->prefix = *dest;
 308                         p->prefixlen = prefixlen;
 309                         ifc->destination = (struct prefix *)p;
 310
 311                         if (IPV4_ADDR_SAME(addr, dest))
 312                                 flog_warn(
 313                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 314                                         "warning: interface %s has same local and peer "
 315                                         "address %s, routing protocols may malfunction",
 316                                         ifp->name, inet_ntoa(*addr));
 317                 } else {
 318                         zlog_debug(
 319                                 "warning: %s called for interface %s "
 320                                 "with peer flag set, but no peer address supplied",
 321                                 __func__, ifp->name);
 322                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 323                 }
 324         }
 325
 326         /* no destination address was supplied */
 327         if (!dest && (prefixlen == IPV4_MAX_PREFIXLEN)
 328                 && if_is_pointopoint(ifp))
 329                 zlog_debug(
 330                         "warning: PtP interface %s with addr %s/%d needs a "
 331                         "peer address",
 332                         ifp->name, inet_ntoa(*addr), prefixlen);
 333
 334         /* Label of this address. */
 335         if (label)
 336                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 337
 338         /* For all that I know an IPv4 address is always ready when we receive
 339          * the notification. So it should be safe to set the REAL flag here. */
 340         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 341
 342         connected_update(ifp, ifc);
 343 }
 344
 345 void connected_down(struct interface *ifp, struct connected *ifc)
 346 {
 347         afi_t afi;
 348         struct prefix p;
 349         struct nexthop nh = {
 350                 .type = NEXTHOP_TYPE_IFINDEX,
 351                 .ifindex = ifp->ifindex,
 352                 .vrf_id = ifp->vrf_id,
 353         };
 354         struct zebra_vrf *zvrf;
 355
 356         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 357         if (!zvrf) {
 358                 flog_err(EC_ZEBRA_VRF_NOT_FOUND,
 359                          "%s: Received Up for interface but no associated zvrf: %d",
 360                          __PRETTY_FUNCTION__, ifp->vrf_id);
 361                 return;
 362         }
 363
 364         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 365                 return;
 366
 367         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 368
 369         /* Apply mask to the network. */
 370         apply_mask(&p);
 371
 372         afi = family2afi(p.family);
 373
 374         switch (afi) {
 375         case AFI_IP:
 376                 /*
 377                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 378                  *  address.
 379                  */
 380                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 381                         return;
 382                 break;
 383         case AFI_IP6:
 384                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 385                         return;
 386                 break;
 387         default:
 388                 zlog_warn("Unknown AFI: %s", afi2str(afi));
 389                 break;
 390         }
 391
 392         /*
 393          * Same logic as for connected_up(): push the changes into the
 394          * head.
 395          */
 396         rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 397                    0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 398
 399         rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 400                    0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false);
 401
 402         /* Schedule LSP forwarding entries for processing, if appropriate. */
 403         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 404                 if (IS_ZEBRA_DEBUG_MPLS) {
 405                         char buf[PREFIX_STRLEN];
 406
 407                         zlog_debug(
 408                                 "%u: IF %s IP %s address down, scheduling MPLS processing",
 409                                 zvrf->vrf->vrf_id, ifp->name,
 410                                 prefix2str(&p, buf, sizeof(buf)));
 411                 }
 412                 mpls_mark_lsps_for_processing(zvrf, &p);
 413         }
 414 }
 415
 416 static void connected_delete_helper(struct connected *ifc, struct prefix *p)
 417 {
 418         struct interface *ifp;
 419
 420         if (!ifc)
 421                 return;
 422         ifp = ifc->ifp;
 423
 424         connected_withdraw(ifc);
 425
 426         /* Schedule LSP forwarding entries for processing, if appropriate. */
 427         if (ifp->vrf_id == VRF_DEFAULT) {
 428                 if (IS_ZEBRA_DEBUG_MPLS) {
 429                         char buf[PREFIX_STRLEN];
 430
 431                         zlog_debug(
 432                                 "%u: IF %s IP %s address delete, scheduling MPLS processing",
 433                                 ifp->vrf_id, ifp->name,
 434                                 prefix2str(p, buf, sizeof(buf)));
 435                 }
 436                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id), p);
 437         }
 438 }
 439
 440 /* Delete connected IPv4 route to the interface. */
 441 void connected_delete_ipv4(struct interface *ifp, int flags,
 442                            struct in_addr *addr, uint16_t prefixlen,
 443                            struct in_addr *dest)
 444 {
 445         struct prefix p, d;
 446         struct connected *ifc;
 447
 448         memset(&p, 0, sizeof(struct prefix));
 449         p.family = AF_INET;
 450         p.u.prefix4 = *addr;
 451         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 452                                                         : prefixlen;
 453
 454         if (dest) {
 455                 memset(&d, 0, sizeof(struct prefix));
 456                 d.family = AF_INET;
 457                 d.u.prefix4 = *dest;
 458                 d.prefixlen = prefixlen;
 459                 ifc = connected_check_ptp(ifp, &p, &d);
 460         } else
 461                 ifc = connected_check_ptp(ifp, &p, NULL);
 462
 463         connected_delete_helper(ifc, &p);
 464 }
 465
 466 /* Add connected IPv6 route to the interface. */
 467 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 468                         struct in6_addr *dest, uint16_t prefixlen,
 469                         const char *label, uint32_t metric)
 470 {
 471         struct prefix_ipv6 *p;
 472         struct connected *ifc;
 473
 474         if (ipv6_martian(addr))
 475                 return;
 476
 477         /* Make connected structure. */
 478         ifc = connected_new();
 479         ifc->ifp = ifp;
 480         ifc->flags = flags;
 481         ifc->metric = metric;
 482         /* If we get a notification from the kernel,
 483          * we can safely assume the address is known to the kernel */
 484         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 485
 486         /* Allocate new connected address. */
 487         p = prefix_ipv6_new();
 488         p->family = AF_INET6;
 489         IPV6_ADDR_COPY(&p->prefix, addr);
 490         p->prefixlen = prefixlen;
 491         ifc->address = (struct prefix *)p;
 492
 493         if (dest) {
 494                 p = prefix_ipv6_new();
 495                 p->family = AF_INET6;
 496                 IPV6_ADDR_COPY(&p->prefix, dest);
 497                 p->prefixlen = prefixlen;
 498                 ifc->destination = (struct prefix *)p;
 499         } else {
 500                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 501                         zlog_debug(
 502                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 503                                 __func__, ifp->name);
 504                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 505                 }
 506         }
 507
 508         /* Label of this address. */
 509         if (label)
 510                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 511
 512         /* On Linux, we only get here when DAD is complete, therefore we can set
 513          * ZEBRA_IFC_REAL.
 514          *
 515          * On BSD, there currently doesn't seem to be a way to check for
 516          * completion of
 517          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 518          * although DAD
 519          * might still be running.
 520          */
 521         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 522         connected_update(ifp, ifc);
 523 }
 524
 525 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 526                            struct in6_addr *dest, uint16_t prefixlen)
 527 {
 528         struct prefix p, d;
 529         struct connected *ifc;
 530
 531         memset(&p, 0, sizeof(struct prefix));
 532         p.family = AF_INET6;
 533         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 534         p.prefixlen = prefixlen;
 535
 536         if (dest) {
 537                 memset(&d, 0, sizeof(struct prefix));
 538                 d.family = AF_INET6;
 539                 IPV6_ADDR_COPY(&d.u.prefix6, dest);
 540                 d.prefixlen = prefixlen;
 541                 ifc = connected_check_ptp(ifp, &p, &d);
 542         } else
 543                 ifc = connected_check_ptp(ifp, &p, NULL);
 544
 545         connected_delete_helper(ifc, &p);
 546 }
 547
 548 int connected_is_unnumbered(struct interface *ifp)
 549 {
 550         struct connected *connected;
 551         struct listnode *node;
 552
 553         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 554                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 555                     && connected->address->family == AF_INET)
 556                         return CHECK_FLAG(connected->flags,
 557                                           ZEBRA_IFA_UNNUMBERED);
 558         }
 559         return 1;
 560 }