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
 213         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 214                 return;
 215
 216         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 217
 218         /* Apply mask to the network. */
 219         apply_mask(&p);
 220
 221         afi = family2afi(p.family);
 222
 223         switch (afi) {
 224         case AFI_IP:
 225                 /*
 226                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 227                  * address.
 228                  */
 229                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 230                         return;
 231                 break;
 232         case AFI_IP6:
 233 #ifndef LINUX
 234                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 235                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 236                         return;
 237 #endif
 238                 break;
 239         default:
 240                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 241                           "Received unknown AFI: %s", afi2str(afi));
 242                 return;
 243                 break;
 244         }
 245
 246         rib_add(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
 247                 NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
 248
 249         rib_add(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0, &p,
 250                 NULL, &nh, RT_TABLE_MAIN, ifp->metric, 0, 0, 0);
 251
 252         if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
 253                 char buf[PREFIX_STRLEN];
 254
 255                 zlog_debug(
 256                         "%u: IF %s address %s add/up, scheduling RIB processing",
 257                         ifp->vrf_id, ifp->name,
 258                         prefix2str(&p, buf, sizeof(buf)));
 259         }
 260         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 261
 262         /* Schedule LSP forwarding entries for processing, if appropriate. */
 263         if (ifp->vrf_id == VRF_DEFAULT) {
 264                 if (IS_ZEBRA_DEBUG_MPLS) {
 265                         char buf[PREFIX_STRLEN];
 266
 267                         zlog_debug(
 268                                 "%u: IF %s IP %s address add/up, scheduling MPLS processing",
 269                                 ifp->vrf_id, ifp->name,
 270                                 prefix2str(&p, buf, sizeof(buf)));
 271                 }
 272                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 273         }
 274 }
 275
 276 /* Add connected IPv4 route to the interface. */
 277 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 278                         uint8_t prefixlen, struct in_addr *broad,
 279                         const char *label)
 280 {
 281         struct prefix_ipv4 *p;
 282         struct connected *ifc;
 283
 284         if (ipv4_martian(addr))
 285                 return;
 286
 287         /* Make connected structure. */
 288         ifc = connected_new();
 289         ifc->ifp = ifp;
 290         ifc->flags = flags;
 291         /* If we get a notification from the kernel,
 292          * we can safely assume the address is known to the kernel */
 293         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 294
 295         /* Allocate new connected address. */
 296         p = prefix_ipv4_new();
 297         p->family = AF_INET;
 298         p->prefix = *addr;
 299         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 300                                                          : prefixlen;
 301         ifc->address = (struct prefix *)p;
 302
 303         /* If there is broadcast or peer address. */
 304         if (broad) {
 305                 p = prefix_ipv4_new();
 306                 p->family = AF_INET;
 307                 p->prefix = *broad;
 308                 p->prefixlen = prefixlen;
 309                 ifc->destination = (struct prefix *)p;
 310
 311                 /* validate the destination address */
 312                 if (CONNECTED_PEER(ifc)) {
 313                         if (IPV4_ADDR_SAME(addr, broad))
 314                                 flog_warn(
 315                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 316                                         "warning: interface %s has same local and peer "
 317                                         "address %s, routing protocols may malfunction",
 318                                         ifp->name, inet_ntoa(*addr));
 319                 } else {
 320                         if (broad->s_addr
 321                             != ipv4_broadcast_addr(addr->s_addr, prefixlen)) {
 322                                 char buf[2][INET_ADDRSTRLEN];
 323                                 struct in_addr bcalc;
 324                                 bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,
 325                                                                    prefixlen);
 326                                 flog_warn(
 327                                         EC_ZEBRA_BCAST_ADDR_MISMATCH,
 328                                         "warning: interface %s broadcast addr %s/%d != "
 329                                         "calculated %s, routing protocols may malfunction",
 330                                         ifp->name,
 331                                         inet_ntop(AF_INET, broad, buf[0],
 332                                                   sizeof(buf[0])),
 333                                         prefixlen,
 334                                         inet_ntop(AF_INET, &bcalc, buf[1],
 335                                                   sizeof(buf[1])));
 336                         }
 337                 }
 338
 339         } else {
 340                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 341                         zlog_debug(
 342                                 "warning: %s called for interface %s "
 343                                 "with peer flag set, but no peer address supplied",
 344                                 __func__, ifp->name);
 345                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 346                 }
 347
 348                 /* no broadcast or destination address was supplied */
 349                 if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
 350                         zlog_debug(
 351                                 "warning: PtP interface %s with addr %s/%d needs a "
 352                                 "peer address",
 353                                 ifp->name, inet_ntoa(*addr), prefixlen);
 354         }
 355
 356         /* Label of this address. */
 357         if (label)
 358                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 359
 360         /* For all that I know an IPv4 address is always ready when we receive
 361          * the notification. So it should be safe to set the REAL flag here. */
 362         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 363
 364         connected_update(ifp, ifc);
 365 }
 366
 367 void connected_down(struct interface *ifp, struct connected *ifc)
 368 {
 369         afi_t afi;
 370         struct prefix p;
 371         struct nexthop nh = {
 372                 .type = NEXTHOP_TYPE_IFINDEX,
 373                 .ifindex = ifp->ifindex,
 374                 .vrf_id = ifp->vrf_id,
 375         };
 376
 377         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 378                 return;
 379
 380         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 381
 382         /* Apply mask to the network. */
 383         apply_mask(&p);
 384
 385         afi = family2afi(p.family);
 386
 387         switch (afi) {
 388         case AFI_IP:
 389                 /*
 390                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 391                  *  address.
 392                  */
 393                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 394                         return;
 395                 break;
 396         case AFI_IP6:
 397                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 398                         return;
 399                 break;
 400         default:
 401                 zlog_info("Unknown AFI: %s", afi2str(afi));
 402                 break;
 403         }
 404
 405         /*
 406          * Same logic as for connected_up(): push the changes into the
 407          * head.
 408          */
 409         rib_delete(afi, SAFI_UNICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 410                    &p, NULL, &nh, 0, 0, 0, false);
 411
 412         rib_delete(afi, SAFI_MULTICAST, ifp->vrf_id, ZEBRA_ROUTE_CONNECT, 0, 0,
 413                    &p, NULL, &nh, 0, 0, 0, false);
 414
 415         if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
 416                 char buf[PREFIX_STRLEN];
 417
 418                 zlog_debug(
 419                         "%u: IF %s IP %s address down, scheduling RIB processing",
 420                         ifp->vrf_id, ifp->name,
 421                         prefix2str(&p, buf, sizeof(buf)));
 422         }
 423
 424         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 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 down, 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));
 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         if (IS_ZEBRA_DEBUG_RIB_DETAILED) {
 451                 char buf[PREFIX_STRLEN];
 452
 453                 zlog_debug(
 454                         "%u: IF %s IP %s address del, scheduling RIB processing",
 455                         ifp->vrf_id, ifp->name,
 456                         prefix2str(p, buf, sizeof(buf)));
 457         }
 458         rib_update(ifp->vrf_id, RIB_UPDATE_IF_CHANGE);
 459
 460         /* Schedule LSP forwarding entries for processing, if appropriate. */
 461         if (ifp->vrf_id == VRF_DEFAULT) {
 462                 if (IS_ZEBRA_DEBUG_MPLS) {
 463                         char buf[PREFIX_STRLEN];
 464
 465                         zlog_debug(
 466                                 "%u: IF %s IP %s address delete, scheduling MPLS processing",
 467                                 ifp->vrf_id, ifp->name,
 468                                 prefix2str(p, buf, sizeof(buf)));
 469                 }
 470                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id));
 471         }
 472 }
 473
 474 /* Delete connected IPv4 route to the interface. */
 475 void connected_delete_ipv4(struct interface *ifp, int flags,
 476                            struct in_addr *addr, uint8_t prefixlen,
 477                            struct in_addr *broad)
 478 {
 479         struct prefix p, d;
 480         struct connected *ifc;
 481
 482         memset(&p, 0, sizeof(struct prefix));
 483         p.family = AF_INET;
 484         p.u.prefix4 = *addr;
 485         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 486                                                         : prefixlen;
 487
 488         if (broad) {
 489                 memset(&d, 0, sizeof(struct prefix));
 490                 d.family = AF_INET;
 491                 d.u.prefix4 = *broad;
 492                 d.prefixlen = prefixlen;
 493                 ifc = connected_check_ptp(ifp, &p, &d);
 494         } else
 495                 ifc = connected_check_ptp(ifp, &p, NULL);
 496
 497         connected_delete_helper(ifc, &p);
 498 }
 499
 500 /* Add connected IPv6 route to the interface. */
 501 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 502                         struct in6_addr *broad, uint8_t prefixlen,
 503                         const char *label)
 504 {
 505         struct prefix_ipv6 *p;
 506         struct connected *ifc;
 507
 508         if (ipv6_martian(addr))
 509                 return;
 510
 511         /* Make connected structure. */
 512         ifc = connected_new();
 513         ifc->ifp = ifp;
 514         ifc->flags = flags;
 515         /* If we get a notification from the kernel,
 516          * we can safely assume the address is known to the kernel */
 517         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 518
 519         /* Allocate new connected address. */
 520         p = prefix_ipv6_new();
 521         p->family = AF_INET6;
 522         IPV6_ADDR_COPY(&p->prefix, addr);
 523         p->prefixlen = prefixlen;
 524         ifc->address = (struct prefix *)p;
 525
 526         if (broad) {
 527                 p = prefix_ipv6_new();
 528                 p->family = AF_INET6;
 529                 IPV6_ADDR_COPY(&p->prefix, broad);
 530                 p->prefixlen = prefixlen;
 531                 ifc->destination = (struct prefix *)p;
 532         } else {
 533                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 534                         zlog_debug(
 535                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 536                                 __func__, ifp->name);
 537                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 538                 }
 539         }
 540
 541         /* Label of this address. */
 542         if (label)
 543                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 544
 545         /* On Linux, we only get here when DAD is complete, therefore we can set
 546          * ZEBRA_IFC_REAL.
 547          *
 548          * On BSD, there currently doesn't seem to be a way to check for
 549          * completion of
 550          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 551          * although DAD
 552          * might still be running.
 553          */
 554         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 555         connected_update(ifp, ifc);
 556 }
 557
 558 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 559                            struct in6_addr *broad, uint8_t prefixlen)
 560 {
 561         struct prefix p, d;
 562         struct connected *ifc;
 563
 564         memset(&p, 0, sizeof(struct prefix));
 565         p.family = AF_INET6;
 566         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 567         p.prefixlen = prefixlen;
 568
 569         if (broad) {
 570                 memset(&d, 0, sizeof(struct prefix));
 571                 d.family = AF_INET6;
 572                 IPV6_ADDR_COPY(&d.u.prefix6, broad);
 573                 d.prefixlen = prefixlen;
 574                 ifc = connected_check_ptp(ifp, &p, &d);
 575         } else
 576                 ifc = connected_check_ptp(ifp, &p, NULL);
 577
 578         connected_delete_helper(ifc, &p);
 579 }
 580
 581 int connected_is_unnumbered(struct interface *ifp)
 582 {
 583         struct connected *connected;
 584         struct listnode *node;
 585
 586         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 587                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 588                     && connected->address->family == AF_INET)
 589                         return CHECK_FLAG(connected->flags,
 590                                           ZEBRA_IFA_UNNUMBERED);
 591         }
 592         return 0;
 593 }