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
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "prefix.h"
  26 #include "linklist.h"
  27 #include "if.h"
  28 #include "table.h"
  29 #include "rib.h"
  30 #include "table.h"
  31 #include "log.h"
  32 #include "memory.h"
  33
  34 #include "zebra/zserv.h"
  35 #include "zebra/redistribute.h"
  36 #include "zebra/interface.h"
  37 #include "zebra/connected.h"
  38 \f
  39 /* withdraw a connected address */
  40 static void
  41 connected_withdraw (struct connected *ifc)
  42 {
  43   if (! ifc)
  44     return;
  45
  46   /* Update interface address information to protocol daemon. */
  47   if (CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
  48     {
  49       zebra_interface_address_delete_update (ifc->ifp, ifc);
  50
  51       if_subnet_delete (ifc->ifp, ifc);
  52
  53       if (ifc->address->family == AF_INET)
  54         connected_down_ipv4 (ifc->ifp, ifc);
  55 #ifdef HAVE_IPV6
  56       else
  57         connected_down_ipv6 (ifc->ifp, ifc);
  58 #endif
  59
  60       UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
  61     }
  62
  63   if (!CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
  64     {
  65       listnode_delete (ifc->ifp->connected, ifc);
  66       connected_free (ifc);
  67     }
  68 }
  69
  70 static void
  71 connected_announce (struct interface *ifp, struct connected *ifc)
  72 {
  73   if (!ifc)
  74     return;
  75
  76   listnode_add (ifp->connected, ifc);
  77
  78   /* Update interface address information to protocol daemon. */
  79   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
  80     {
  81       if (ifc->address->family == AF_INET)
  82         if_subnet_add (ifp, ifc);
  83
  84       SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
  85
  86       zebra_interface_address_add_update (ifp, ifc);
  87
  88       if (if_is_up(ifp))
  89         {
  90           if (ifc->address->family == AF_INET)
  91             connected_up_ipv4 (ifp, ifc);
  92 #ifdef HAVE_IPV6
  93           else
  94             connected_up_ipv6 (ifp, ifc);
  95 #endif
  96         }
  97     }
  98 }
  99 \f
 100 /* If same interface address is already exist... */
 101 struct connected *
 102 connected_check (struct interface *ifp, struct prefix *p)
 103 {
 104   struct connected *ifc;
 105   struct listnode *node;
 106
 107   for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, ifc))
 108     if (prefix_same (ifc->address, p))
 109       return ifc;
 110
 111   return NULL;
 112 }
 113
 114 /* Check if two ifc's describe the same address */
 115 static int
 116 connected_same (struct connected *ifc1, struct connected *ifc2)
 117 {
 118   if (ifc1->ifp != ifc2->ifp)
 119     return 0;
 120
 121   if (ifc1->destination)
 122     if (!ifc2->destination)
 123       return 0;
 124   if (ifc2->destination)
 125     if (!ifc1->destination)
 126       return 0;
 127
 128   if (ifc1->destination && ifc2->destination)
 129     if (!prefix_same (ifc1->destination, ifc2->destination))
 130       return 0;
 131
 132   if (ifc1->flags != ifc2->flags)
 133     return 0;
 134
 135   return 1;
 136 }
 137
 138 /* Handle implicit withdrawals of addresses, where a system ADDs an address
 139  * to an interface which already has the same address configured.
 140  *
 141  * Returns the struct connected which must be announced to clients,
 142  * or NULL if nothing to do.
 143  */
 144 static struct connected *
 145 connected_implicit_withdraw (struct interface *ifp, struct connected *ifc)
 146 {
 147   struct connected *current;
 148
 149   /* Check same connected route. */
 150   if ((current = connected_check (ifp, (struct prefix *) ifc->address)))
 151     {
 152       if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 153         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 154
 155       /* Avoid spurious withdraws, this might be just the kernel 'reflecting'
 156        * back an address we have already added.
 157        */
 158       if (connected_same (current, ifc))
 159         {
 160           /* nothing to do */
 161           connected_free (ifc);
 162           return NULL;
 163         }
 164
 165       UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 166       connected_withdraw (current); /* implicit withdraw - freebsd does this */
 167     }
 168   return ifc;
 169 }
 170
 171 /* Called from if_up(). */
 172 void
 173 connected_up_ipv4 (struct interface *ifp, struct connected *ifc)
 174 {
 175   struct prefix_ipv4 p;
 176
 177   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 178     return;
 179
 180   PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
 181
 182   /* Apply mask to the network. */
 183   apply_mask_ipv4 (&p);
 184
 185   /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 186      address. */
 187   if (prefix_ipv4_any (&p))
 188     return;
 189
 190   rib_add_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, RT_TABLE_MAIN,
 191                 ifp->metric, 0);
 192
 193   rib_update ();
 194 }
 195
 196 /* Add connected IPv4 route to the interface. */
 197 void
 198 connected_add_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
 199                     u_char prefixlen, struct in_addr *broad,
 200                     const char *label)
 201 {
 202   struct prefix_ipv4 *p;
 203   struct connected *ifc;
 204
 205   /* Make connected structure. */
 206   ifc = connected_new ();
 207   ifc->ifp = ifp;
 208   ifc->flags = flags;
 209
 210   /* Allocate new connected address. */
 211   p = prefix_ipv4_new ();
 212   p->family = AF_INET;
 213   p->prefix = *addr;
 214   p->prefixlen = prefixlen;
 215   ifc->address = (struct prefix *) p;
 216
 217   /* If there is broadcast or peer address. */
 218   if (broad)
 219     {
 220       p = prefix_ipv4_new ();
 221       p->family = AF_INET;
 222       p->prefix = *broad;
 223       p->prefixlen = prefixlen;
 224       ifc->destination = (struct prefix *) p;
 225
 226       /* validate the destination address */
 227       if (CONNECTED_PEER(ifc))
 228         {
 229           if (IPV4_ADDR_SAME(addr,broad))
 230             zlog_warn("warning: interface %s has same local and peer "
 231                       "address %s, routing protocols may malfunction",
 232                       ifp->name,inet_ntoa(*addr));
 233         }
 234       else
 235         {
 236           if (broad->s_addr != ipv4_broadcast_addr(addr->s_addr,prefixlen))
 237             {
 238               char buf[2][INET_ADDRSTRLEN];
 239               struct in_addr bcalc;
 240               bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,prefixlen);
 241               zlog_warn("warning: interface %s broadcast addr %s/%d != "
 242                         "calculated %s, routing protocols may malfunction",
 243                         ifp->name,
 244                         inet_ntop (AF_INET, broad, buf[0], sizeof(buf[0])),
 245                         prefixlen,
 246                         inet_ntop (AF_INET, &bcalc, buf[1], sizeof(buf[1])));
 247             }
 248         }
 249
 250     }
 251   else
 252     {
 253       if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER))
 254         {
 255           zlog_warn("warning: %s called for interface %s "
 256                     "with peer flag set, but no peer address supplied",
 257                     __func__, ifp->name);
 258           UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 259         }
 260
 261       /* no broadcast or destination address was supplied */
 262       if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
 263         zlog_warn("warning: PtP interface %s with addr %s/%d needs a "
 264                   "peer address",ifp->name,inet_ntoa(*addr),prefixlen);
 265     }
 266
 267   /* Label of this address. */
 268   if (label)
 269     ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
 270
 271   /* nothing to do? */
 272   if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
 273     return;
 274
 275   connected_announce (ifp, ifc);
 276 }
 277
 278 void
 279 connected_down_ipv4 (struct interface *ifp, struct connected *ifc)
 280 {
 281   struct prefix_ipv4 p;
 282
 283   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 284     return;
 285
 286   PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
 287
 288   /* Apply mask to the network. */
 289   apply_mask_ipv4 (&p);
 290
 291   /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 292      address. */
 293   if (prefix_ipv4_any (&p))
 294     return;
 295
 296   rib_delete_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
 297
 298   rib_update ();
 299 }
 300
 301 /* Delete connected IPv4 route to the interface. */
 302 void
 303 connected_delete_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
 304                        u_char prefixlen, struct in_addr *broad)
 305 {
 306   struct prefix_ipv4 p;
 307   struct connected *ifc;
 308
 309   memset (&p, 0, sizeof (struct prefix_ipv4));
 310   p.family = AF_INET;
 311   p.prefix = *addr;
 312   p.prefixlen = prefixlen;
 313
 314   ifc = connected_check (ifp, (struct prefix *) &p);
 315   if (! ifc)
 316     return;
 317
 318   connected_withdraw (ifc);
 319 }
 320
 321 #ifdef HAVE_IPV6
 322 void
 323 connected_up_ipv6 (struct interface *ifp, struct connected *ifc)
 324 {
 325   struct prefix_ipv6 p;
 326
 327   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 328     return;
 329
 330   PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
 331
 332   /* Apply mask to the network. */
 333   apply_mask_ipv6 (&p);
 334
 335 #if ! defined (MUSICA) && ! defined (LINUX)
 336   /* XXX: It is already done by rib_bogus_ipv6 within rib_add_ipv6 */
 337   if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
 338     return;
 339 #endif
 340
 341   rib_add_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0,
 342                 ifp->metric, 0);
 343
 344   rib_update ();
 345 }
 346
 347 /* Add connected IPv6 route to the interface. */
 348 void
 349 connected_add_ipv6 (struct interface *ifp, int flags, struct in6_addr *addr,
 350                     u_char prefixlen, struct in6_addr *broad,
 351                     const char *label)
 352 {
 353   struct prefix_ipv6 *p;
 354   struct connected *ifc;
 355
 356   /* Make connected structure. */
 357   ifc = connected_new ();
 358   ifc->ifp = ifp;
 359   ifc->flags = flags;
 360
 361   /* Allocate new connected address. */
 362   p = prefix_ipv6_new ();
 363   p->family = AF_INET6;
 364   IPV6_ADDR_COPY (&p->prefix, addr);
 365   p->prefixlen = prefixlen;
 366   ifc->address = (struct prefix *) p;
 367
 368   /* If there is broadcast or peer address. */
 369   if (broad)
 370     {
 371       if (IN6_IS_ADDR_UNSPECIFIED(broad))
 372         zlog_warn("warning: %s called for interface %s with unspecified "
 373                   "destination address; ignoring!", __func__, ifp->name);
 374       else
 375         {
 376           p = prefix_ipv6_new ();
 377           p->family = AF_INET6;
 378           IPV6_ADDR_COPY (&p->prefix, broad);
 379           p->prefixlen = prefixlen;
 380           ifc->destination = (struct prefix *) p;
 381         }
 382     }
 383   if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER) && !ifc->destination)
 384     {
 385       zlog_warn("warning: %s called for interface %s "
 386                 "with peer flag set, but no peer address supplied",
 387                 __func__, ifp->name);
 388       UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 389     }
 390
 391   /* Label of this address. */
 392   if (label)
 393     ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
 394
 395   if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
 396     return;
 397
 398   connected_announce (ifp, ifc);
 399 }
 400
 401 void
 402 connected_down_ipv6 (struct interface *ifp, struct connected *ifc)
 403 {
 404   struct prefix_ipv6 p;
 405
 406   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 407     return;
 408
 409   PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
 410
 411   apply_mask_ipv6 (&p);
 412
 413   if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
 414     return;
 415
 416   rib_delete_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
 417
 418   rib_update ();
 419 }
 420
 421 void
 422 connected_delete_ipv6 (struct interface *ifp, struct in6_addr *address,
 423                        u_char prefixlen, struct in6_addr *broad)
 424 {
 425   struct prefix_ipv6 p;
 426   struct connected *ifc;
 427
 428   memset (&p, 0, sizeof (struct prefix_ipv6));
 429   p.family = AF_INET6;
 430   memcpy (&p.prefix, address, sizeof (struct in6_addr));
 431   p.prefixlen = prefixlen;
 432
 433   ifc = connected_check (ifp, (struct prefix *) &p);
 434   if (! ifc)
 435     return;
 436
 437   connected_withdraw (ifc);
 438 }
 439 #endif /* HAVE_IPV6 */