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         /* ignore broadcast addresses */
 124         if (p->prefixlen != IPV4_MAX_PREFIXLEN)
 125                 d = NULL;
 126
 127         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 128                 if (!prefix_same(ifc->address, p))
 129                         continue;
 130                 if (!CONNECTED_PEER(ifc) && !d)
 131                         return ifc;
 132                 if (CONNECTED_PEER(ifc) && d
 133                     && prefix_same(ifc->destination, d))
 134                         return ifc;
 135         }
 136
 137         return NULL;
 138 }
 139
 140 /* Check if two ifc's describe the same address in the same state */
 141 static int connected_same(struct connected *ifc1, struct connected *ifc2)
 142 {
 143         if (ifc1->ifp != ifc2->ifp)
 144                 return 0;
 145
 146         if (ifc1->destination)
 147                 if (!ifc2->destination)
 148                         return 0;
 149         if (ifc2->destination)
 150                 if (!ifc1->destination)
 151                         return 0;
 152
 153         if (ifc1->destination && ifc2->destination)
 154                 if (!prefix_same(ifc1->destination, ifc2->destination))
 155                         return 0;
 156
 157         if (ifc1->flags != ifc2->flags)
 158                 return 0;
 159
 160         if (ifc1->conf != ifc2->conf)
 161                 return 0;
 162
 163         return 1;
 164 }
 165
 166 /* Handle changes to addresses and send the neccesary announcements
 167  * to clients. */
 168 static void connected_update(struct interface *ifp, struct connected *ifc)
 169 {
 170         struct connected *current;
 171
 172         /* Check same connected route. */
 173         current = connected_check_ptp(ifp, ifc->address, ifc->destination);
 174         if (current) {
 175                 if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 176                         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 177
 178                 /* Avoid spurious withdraws, this might be just the kernel
 179                  * 'reflecting'
 180                  * back an address we have already added.
 181                  */
 182                 if (connected_same(current, ifc)) {
 183                         /* nothing to do */
 184                         connected_free(ifc);
 185                         return;
 186                 }
 187
 188                 /* Clear the configured flag on the old ifc, so it will be freed
 189                  * by
 190                  * connected withdraw. */
 191                 UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 192                 connected_withdraw(
 193                         current); /* implicit withdraw - freebsd does this */
 194         }
 195
 196         /* If the connected is new or has changed, announce it, if it is usable
 197          */
 198         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 199                 connected_announce(ifp, ifc);
 200 }
 201
 202 /* Called from if_up(). */
 203 void connected_up(struct interface *ifp, struct connected *ifc)
 204 {
 205         afi_t afi;
 206         struct prefix p;
 207         struct nexthop nh = {
 208                 .type = NEXTHOP_TYPE_IFINDEX,
 209                 .ifindex = ifp->ifindex,
 210                 .vrf_id = ifp->vrf_id,
 211         };
 212         struct zebra_vrf *zvrf;
 213         uint32_t metric;
 214
 215         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 216         if (!zvrf) {
 217                 flog_err(EC_ZEBRA_VRF_NOT_FOUND,
 218                          "%s: Received Up for interface but no associated zvrf: %d",
 219                          __PRETTY_FUNCTION__, ifp->vrf_id);
 220                 return;
 221         }
 222         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 223                 return;
 224
 225         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 226
 227         /* Apply mask to the network. */
 228         apply_mask(&p);
 229
 230         afi = family2afi(p.family);
 231
 232         switch (afi) {
 233         case AFI_IP:
 234                 /*
 235                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 236                  * address.
 237                  */
 238                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 239                         return;
 240                 break;
 241         case AFI_IP6:
 242 #ifndef LINUX
 243                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 244                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 245                         return;
 246 #endif
 247                 break;
 248         default:
 249                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 250                           "Received unknown AFI: %s", afi2str(afi));
 251                 return;
 252                 break;
 253         }
 254
 255         metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
 256                                 ifc->metric : ifp->metric;
 257         rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 258                 0, 0, &p, NULL, &nh, zvrf->table_id, metric, 0, 0, 0);
 259
 260         rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 261                 0, 0, &p, NULL, &nh, zvrf->table_id, metric, 0, 0, 0);
 262
 263         /* Schedule LSP forwarding entries for processing, if appropriate. */
 264         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 265                 if (IS_ZEBRA_DEBUG_MPLS) {
 266                         char buf[PREFIX_STRLEN];
 267
 268                         zlog_debug(
 269                                 "%u: IF %s IP %s address add/up, scheduling MPLS processing",
 270                                 zvrf->vrf->vrf_id, ifp->name,
 271                                 prefix2str(&p, buf, sizeof(buf)));
 272                 }
 273                 mpls_mark_lsps_for_processing(zvrf, &p);
 274         }
 275 }
 276
 277 /* Add connected IPv4 route to the interface. */
 278 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 279                         uint16_t prefixlen, struct in_addr *broad,
 280                         const char *label, uint32_t metric)
 281 {
 282         struct prefix_ipv4 *p;
 283         struct connected *ifc;
 284
 285         if (ipv4_martian(addr))
 286                 return;
 287
 288         /* Make connected structure. */
 289         ifc = connected_new();
 290         ifc->ifp = ifp;
 291         ifc->flags = flags;
 292         ifc->metric = metric;
 293         /* If we get a notification from the kernel,
 294          * we can safely assume the address is known to the kernel */
 295         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 296
 297         /* Allocate new connected address. */
 298         p = prefix_ipv4_new();
 299         p->family = AF_INET;
 300         p->prefix = *addr;
 301         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 302                                                          : prefixlen;
 303         ifc->address = (struct prefix *)p;
 304
 305         /* If there is broadcast or peer address. */
 306         if (broad) {
 307                 p = prefix_ipv4_new();
 308                 p->family = AF_INET;
 309                 p->prefix = *broad;
 310                 p->prefixlen = prefixlen;
 311                 ifc->destination = (struct prefix *)p;
 312
 313                 /* validate the destination address */
 314                 if (CONNECTED_PEER(ifc)) {
 315                         if (IPV4_ADDR_SAME(addr, broad))
 316                                 flog_warn(
 317                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 318                                         "warning: interface %s has same local and peer "
 319                                         "address %s, routing protocols may malfunction",
 320                                         ifp->name, inet_ntoa(*addr));
 321                 } else {
 322                         if (broad->s_addr
 323                             != ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
 324                                 char buf[2][INET_ADDRSTRLEN];
 325                                 struct in_addr bcalc;
 326                                 bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
 327                                                                    prefixlen);
 328                                 flog_warn(
 329                                         EC_ZEBRA_BCAST_ADDR_MISMATCH,
 330                                         "warning: interface %s broadcast addr %s/%d != "
 331                                         "calculated %s, routing protocols may malfunction",
 332                                         ifp->name,
 333                                         inet_ntop(AF_INET, broad, buf[0],
 334                                                   sizeof(buf[0])),
 335                                         prefixlen,
 336                                         inet_ntop(AF_INET, &bcalc, buf[1],
 337                                                   sizeof(buf[1])));
 338                         }
 339                 }
 340
 341         } else {
 342                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 343                         zlog_debug(
 344                                 "warning: %s called for interface %s "
 345                                 "with peer flag set, but no peer address supplied",
 346                                 __func__, ifp->name);
 347                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 348                 }
 349
 350                 /* no broadcast or destination address was supplied */
 351                 if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
 352                         zlog_debug(
 353                                 "warning: PtP interface %s with addr %s/%d needs a "
 354                                 "peer address",
 355                                 ifp->name, inet_ntoa(*addr), prefixlen);
 356         }
 357
 358         /* Label of this address. */
 359         if (label)
 360                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 361
 362         /* For all that I know an IPv4 address is always ready when we receive
 363          * the notification. So it should be safe to set the REAL flag here. */
 364         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 365
 366         connected_update(ifp, ifc);
 367 }
 368
 369 void connected_down(struct interface *ifp, struct connected *ifc)
 370 {
 371         afi_t afi;
 372         struct prefix p;
 373         struct nexthop nh = {
 374                 .type = NEXTHOP_TYPE_IFINDEX,
 375                 .ifindex = ifp->ifindex,
 376                 .vrf_id = ifp->vrf_id,
 377         };
 378         struct zebra_vrf *zvrf;
 379
 380         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 381         if (!zvrf) {
 382                 flog_err(EC_ZEBRA_VRF_NOT_FOUND,
 383                          "%s: Received Up for interface but no associated zvrf: %d",
 384                          __PRETTY_FUNCTION__, ifp->vrf_id);
 385                 return;
 386         }
 387
 388         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 389                 return;
 390
 391         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 392
 393         /* Apply mask to the network. */
 394         apply_mask(&p);
 395
 396         afi = family2afi(p.family);
 397
 398         switch (afi) {
 399         case AFI_IP:
 400                 /*
 401                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 402                  *  address.
 403                  */
 404                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 405                         return;
 406                 break;
 407         case AFI_IP6:
 408                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 409                         return;
 410                 break;
 411         default:
 412                 zlog_info("Unknown AFI: %s", afi2str(afi));
 413                 break;
 414         }
 415
 416         /*
 417          * Same logic as for connected_up(): push the changes into the
 418          * head.
 419          */
 420         rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 421                    0, 0, &p, NULL, &nh, zvrf->table_id, 0, 0, false);
 422
 423         rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 424                    0, 0, &p, NULL, &nh, zvrf->table_id, 0, 0, false);
 425
 426         /* Schedule LSP forwarding entries for processing, if appropriate. */
 427         if (zvrf->vrf->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 down, scheduling MPLS processing",
 433                                 zvrf->vrf->vrf_id, ifp->name,
 434                                 prefix2str(&p, buf, sizeof(buf)));
 435                 }
 436                 mpls_mark_lsps_for_processing(zvrf, &p);
 437         }
 438 }
 439
 440 static void connected_delete_helper(struct connected *ifc, struct prefix *p)
 441 {
 442         struct interface *ifp;
 443
 444         if (!ifc)
 445                 return;
 446         ifp = ifc->ifp;
 447
 448         connected_withdraw(ifc);
 449
 450         /* Schedule LSP forwarding entries for processing, if appropriate. */
 451         if (ifp->vrf_id == VRF_DEFAULT) {
 452                 if (IS_ZEBRA_DEBUG_MPLS) {
 453                         char buf[PREFIX_STRLEN];
 454
 455                         zlog_debug(
 456                                 "%u: IF %s IP %s address delete, scheduling MPLS processing",
 457                                 ifp->vrf_id, ifp->name,
 458                                 prefix2str(p, buf, sizeof(buf)));
 459                 }
 460                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id), p);
 461         }
 462 }
 463
 464 /* Delete connected IPv4 route to the interface. */
 465 void connected_delete_ipv4(struct interface *ifp, int flags,
 466                            struct in_addr *addr, uint16_t prefixlen,
 467                            struct in_addr *broad)
 468 {
 469         struct prefix p, d;
 470         struct connected *ifc;
 471
 472         memset(&p, 0, sizeof(struct prefix));
 473         p.family = AF_INET;
 474         p.u.prefix4 = *addr;
 475         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 476                                                         : prefixlen;
 477
 478         if (broad) {
 479                 memset(&d, 0, sizeof(struct prefix));
 480                 d.family = AF_INET;
 481                 d.u.prefix4 = *broad;
 482                 d.prefixlen = prefixlen;
 483                 ifc = connected_check_ptp(ifp, &p, &d);
 484         } else
 485                 ifc = connected_check_ptp(ifp, &p, NULL);
 486
 487         connected_delete_helper(ifc, &p);
 488 }
 489
 490 /* Add connected IPv6 route to the interface. */
 491 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 492                         struct in6_addr *broad, uint16_t prefixlen,
 493                         const char *label, uint32_t metric)
 494 {
 495         struct prefix_ipv6 *p;
 496         struct connected *ifc;
 497
 498         if (ipv6_martian(addr))
 499                 return;
 500
 501         /* Make connected structure. */
 502         ifc = connected_new();
 503         ifc->ifp = ifp;
 504         ifc->flags = flags;
 505         ifc->metric = metric;
 506         /* If we get a notification from the kernel,
 507          * we can safely assume the address is known to the kernel */
 508         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 509
 510         /* Allocate new connected address. */
 511         p = prefix_ipv6_new();
 512         p->family = AF_INET6;
 513         IPV6_ADDR_COPY(&p->prefix, addr);
 514         p->prefixlen = prefixlen;
 515         ifc->address = (struct prefix *)p;
 516
 517         if (broad) {
 518                 p = prefix_ipv6_new();
 519                 p->family = AF_INET6;
 520                 IPV6_ADDR_COPY(&p->prefix, broad);
 521                 p->prefixlen = prefixlen;
 522                 ifc->destination = (struct prefix *)p;
 523         } else {
 524                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 525                         zlog_debug(
 526                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 527                                 __func__, ifp->name);
 528                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 529                 }
 530         }
 531
 532         /* Label of this address. */
 533         if (label)
 534                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 535
 536         /* On Linux, we only get here when DAD is complete, therefore we can set
 537          * ZEBRA_IFC_REAL.
 538          *
 539          * On BSD, there currently doesn't seem to be a way to check for
 540          * completion of
 541          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 542          * although DAD
 543          * might still be running.
 544          */
 545         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 546         connected_update(ifp, ifc);
 547 }
 548
 549 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 550                            struct in6_addr *broad, uint16_t prefixlen)
 551 {
 552         struct prefix p, d;
 553         struct connected *ifc;
 554
 555         memset(&p, 0, sizeof(struct prefix));
 556         p.family = AF_INET6;
 557         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 558         p.prefixlen = prefixlen;
 559
 560         if (broad) {
 561                 memset(&d, 0, sizeof(struct prefix));
 562                 d.family = AF_INET6;
 563                 IPV6_ADDR_COPY(&d.u.prefix6, broad);
 564                 d.prefixlen = prefixlen;
 565                 ifc = connected_check_ptp(ifp, &p, &d);
 566         } else
 567                 ifc = connected_check_ptp(ifp, &p, NULL);
 568
 569         connected_delete_helper(ifc, &p);
 570 }
 571
 572 int connected_is_unnumbered(struct interface *ifp)
 573 {
 574         struct connected *connected;
 575         struct listnode *node;
 576
 577         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 578                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 579                     && connected->address->family == AF_INET)
 580                         return CHECK_FLAG(connected->flags,
 581                                           ZEBRA_IFA_UNNUMBERED);
 582         }
 583         return 1;
 584 }