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 extern struct zebra_t zebrad;
  39 \f
  40 /* withdraw a connected address */
  41 static void
  42 connected_withdraw (struct connected *ifc)
  43 {
  44   if (! ifc)
  45     return;
  46
  47   /* Update interface address information to protocol daemon. */
  48   if (CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
  49     {
  50       zebra_interface_address_delete_update (ifc->ifp, ifc);
  51
  52       if_subnet_delete (ifc->ifp, ifc);
  53
  54       if (ifc->address->family == AF_INET)
  55         connected_down_ipv4 (ifc->ifp, ifc);
  56 #ifdef HAVE_IPV6
  57       else
  58         connected_down_ipv6 (ifc->ifp, ifc);
  59 #endif
  60
  61       UNSET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
  62     }
  63
  64   if (!CHECK_FLAG (ifc->conf, ZEBRA_IFC_CONFIGURED))
  65     {
  66       listnode_delete (ifc->ifp->connected, ifc);
  67       connected_free (ifc);
  68     }
  69 }
  70
  71 static void
  72 connected_announce (struct interface *ifp, struct connected *ifc)
  73 {
  74   if (!ifc)
  75     return;
  76
  77   listnode_add (ifp->connected, ifc);
  78
  79   /* Update interface address information to protocol daemon. */
  80   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
  81     {
  82       if (ifc->address->family == AF_INET)
  83         if_subnet_add (ifp, ifc);
  84
  85       SET_FLAG (ifc->conf, ZEBRA_IFC_REAL);
  86
  87       zebra_interface_address_add_update (ifp, ifc);
  88
  89       if (if_is_operative(ifp))
  90         {
  91           if (ifc->address->family == AF_INET)
  92             connected_up_ipv4 (ifp, ifc);
  93 #ifdef HAVE_IPV6
  94           else
  95             connected_up_ipv6 (ifp, ifc);
  96 #endif
  97         }
  98     }
  99 }
 100 \f
 101 /* If same interface address is already exist... */
 102 struct connected *
 103 connected_check (struct interface *ifp, struct prefix *p)
 104 {
 105   struct connected *ifc;
 106   struct listnode *node;
 107
 108   for (ALL_LIST_ELEMENTS_RO (ifp->connected, node, ifc))
 109     if (prefix_same (ifc->address, p))
 110       return ifc;
 111
 112   return NULL;
 113 }
 114
 115 /* Check if two ifc's describe the same address */
 116 static int
 117 connected_same (struct connected *ifc1, struct connected *ifc2)
 118 {
 119   if (ifc1->ifp != ifc2->ifp)
 120     return 0;
 121
 122   if (ifc1->destination)
 123     if (!ifc2->destination)
 124       return 0;
 125   if (ifc2->destination)
 126     if (!ifc1->destination)
 127       return 0;
 128
 129   if (ifc1->destination && ifc2->destination)
 130     if (!prefix_same (ifc1->destination, ifc2->destination))
 131       return 0;
 132
 133   if (ifc1->flags != ifc2->flags)
 134     return 0;
 135
 136   return 1;
 137 }
 138
 139 /* Handle implicit withdrawals of addresses, where a system ADDs an address
 140  * to an interface which already has the same address configured.
 141  *
 142  * Returns the struct connected which must be announced to clients,
 143  * or NULL if nothing to do.
 144  */
 145 static struct connected *
 146 connected_implicit_withdraw (struct interface *ifp, struct connected *ifc)
 147 {
 148   struct connected *current;
 149
 150   /* Check same connected route. */
 151   if ((current = connected_check (ifp, (struct prefix *) ifc->address)))
 152     {
 153       if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 154         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 155
 156       /* Avoid spurious withdraws, this might be just the kernel 'reflecting'
 157        * back an address we have already added.
 158        */
 159       if (connected_same (current, ifc) && CHECK_FLAG(current->conf, ZEBRA_IFC_REAL))
 160         {
 161           /* nothing to do */
 162           connected_free (ifc);
 163           return NULL;
 164         }
 165
 166       UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 167       connected_withdraw (current); /* implicit withdraw - freebsd does this */
 168     }
 169   return ifc;
 170 }
 171
 172 /* Called from if_up(). */
 173 void
 174 connected_up_ipv4 (struct interface *ifp, struct connected *ifc)
 175 {
 176   struct prefix_ipv4 p;
 177
 178   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 179     return;
 180
 181   PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
 182
 183   /* Apply mask to the network. */
 184   apply_mask_ipv4 (&p);
 185
 186   /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 187      address. */
 188   if (prefix_ipv4_any (&p))
 189     return;
 190
 191   rib_add_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, NULL, ifp->ifindex,
 192         RT_TABLE_MAIN, ifp->metric, 0);
 193
 194   rib_update ();
 195 }
 196
 197 /* Add connected IPv4 route to the interface. */
 198 void
 199 connected_add_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
 200                     u_char prefixlen, struct in_addr *broad,
 201                     const char *label)
 202 {
 203   struct prefix_ipv4 *p;
 204   struct connected *ifc;
 205
 206   /* Make connected structure. */
 207   ifc = connected_new ();
 208   ifc->ifp = ifp;
 209   ifc->flags = flags;
 210
 211   /* Allocate new connected address. */
 212   p = prefix_ipv4_new ();
 213   p->family = AF_INET;
 214   p->prefix = *addr;
 215   p->prefixlen = prefixlen;
 216   ifc->address = (struct prefix *) p;
 217
 218   /* If there is broadcast or peer address. */
 219   if (broad)
 220     {
 221       p = prefix_ipv4_new ();
 222       p->family = AF_INET;
 223       p->prefix = *broad;
 224       p->prefixlen = prefixlen;
 225       ifc->destination = (struct prefix *) p;
 226
 227       /* validate the destination address */
 228       if (CONNECTED_PEER(ifc))
 229         {
 230           if (IPV4_ADDR_SAME(addr,broad))
 231             zlog_warn("warning: interface %s has same local and peer "
 232                       "address %s, routing protocols may malfunction",
 233                       ifp->name,inet_ntoa(*addr));
 234         }
 235       else
 236         {
 237           if (broad->s_addr != ipv4_broadcast_addr(addr->s_addr,prefixlen))
 238             {
 239               char buf[2][INET_ADDRSTRLEN];
 240               struct in_addr bcalc;
 241               bcalc.s_addr = ipv4_broadcast_addr(addr->s_addr,prefixlen);
 242               zlog_warn("warning: interface %s broadcast addr %s/%d != "
 243                         "calculated %s, routing protocols may malfunction",
 244                         ifp->name,
 245                         inet_ntop (AF_INET, broad, buf[0], sizeof(buf[0])),
 246                         prefixlen,
 247                         inet_ntop (AF_INET, &bcalc, buf[1], sizeof(buf[1])));
 248             }
 249         }
 250
 251     }
 252   else
 253     {
 254       if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER))
 255         {
 256           zlog_warn("warning: %s called for interface %s "
 257                     "with peer flag set, but no peer address supplied",
 258                     __func__, ifp->name);
 259           UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 260         }
 261
 262       /* no broadcast or destination address was supplied */
 263       if ((prefixlen == IPV4_MAX_PREFIXLEN) && if_is_pointopoint(ifp))
 264         zlog_warn("warning: PtP interface %s with addr %s/%d needs a "
 265                   "peer address",ifp->name,inet_ntoa(*addr),prefixlen);
 266     }
 267
 268   /* Label of this address. */
 269   if (label)
 270     ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
 271
 272   /* nothing to do? */
 273   if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
 274     return;
 275
 276   connected_announce (ifp, ifc);
 277 }
 278
 279 void
 280 connected_down_ipv4 (struct interface *ifp, struct connected *ifc)
 281 {
 282   struct prefix_ipv4 p;
 283
 284   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 285     return;
 286
 287   PREFIX_COPY_IPV4(&p, CONNECTED_PREFIX(ifc));
 288
 289   /* Apply mask to the network. */
 290   apply_mask_ipv4 (&p);
 291
 292   /* In case of connected address is 0.0.0.0/0 we treat it tunnel
 293      address. */
 294   if (prefix_ipv4_any (&p))
 295     return;
 296
 297   /* Same logic as for connected_up_ipv4(): push the changes into the head. */
 298   rib_delete_ipv4 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
 299
 300   rib_update ();
 301 }
 302
 303 /* Delete connected IPv4 route to the interface. */
 304 void
 305 connected_delete_ipv4 (struct interface *ifp, int flags, struct in_addr *addr,
 306                        u_char prefixlen, struct in_addr *broad)
 307 {
 308   struct prefix_ipv4 p;
 309   struct connected *ifc;
 310
 311   memset (&p, 0, sizeof (struct prefix_ipv4));
 312   p.family = AF_INET;
 313   p.prefix = *addr;
 314   p.prefixlen = prefixlen;
 315
 316   ifc = connected_check (ifp, (struct prefix *) &p);
 317   if (! ifc)
 318     return;
 319
 320   connected_withdraw (ifc);
 321
 322   rib_update();
 323 }
 324
 325 #ifdef HAVE_IPV6
 326 void
 327 connected_up_ipv6 (struct interface *ifp, struct connected *ifc)
 328 {
 329   struct prefix_ipv6 p;
 330
 331   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 332     return;
 333
 334   PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
 335
 336   /* Apply mask to the network. */
 337   apply_mask_ipv6 (&p);
 338
 339 #if ! defined (MUSICA) && ! defined (LINUX)
 340   /* XXX: It is already done by rib_bogus_ipv6 within rib_add_ipv6 */
 341   if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
 342     return;
 343 #endif
 344
 345   rib_add_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, RT_TABLE_MAIN,
 346                 ifp->metric, 0);
 347
 348   rib_update ();
 349 }
 350
 351 /* Add connected IPv6 route to the interface. */
 352 void
 353 connected_add_ipv6 (struct interface *ifp, int flags, struct in6_addr *addr,
 354                     u_char prefixlen, struct in6_addr *broad,
 355                     const char *label)
 356 {
 357   struct prefix_ipv6 *p;
 358   struct connected *ifc;
 359
 360   /* Make connected structure. */
 361   ifc = connected_new ();
 362   ifc->ifp = ifp;
 363   ifc->flags = flags;
 364
 365   /* Allocate new connected address. */
 366   p = prefix_ipv6_new ();
 367   p->family = AF_INET6;
 368   IPV6_ADDR_COPY (&p->prefix, addr);
 369   p->prefixlen = prefixlen;
 370   ifc->address = (struct prefix *) p;
 371
 372   /* If there is broadcast or peer address. */
 373   if (broad)
 374     {
 375       if (IN6_IS_ADDR_UNSPECIFIED(broad))
 376         zlog_warn("warning: %s called for interface %s with unspecified "
 377                   "destination address; ignoring!", __func__, ifp->name);
 378       else
 379         {
 380           p = prefix_ipv6_new ();
 381           p->family = AF_INET6;
 382           IPV6_ADDR_COPY (&p->prefix, broad);
 383           p->prefixlen = prefixlen;
 384           ifc->destination = (struct prefix *) p;
 385         }
 386     }
 387   if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER) && !ifc->destination)
 388     {
 389       zlog_warn("warning: %s called for interface %s "
 390                 "with peer flag set, but no peer address supplied",
 391                 __func__, ifp->name);
 392       UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 393     }
 394
 395   /* Label of this address. */
 396   if (label)
 397     ifc->label = XSTRDUP (MTYPE_CONNECTED_LABEL, label);
 398
 399   if ((ifc = connected_implicit_withdraw (ifp, ifc)) == NULL)
 400     return;
 401
 402   connected_announce (ifp, ifc);
 403 }
 404
 405 void
 406 connected_down_ipv6 (struct interface *ifp, struct connected *ifc)
 407 {
 408   struct prefix_ipv6 p;
 409
 410   if (! CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 411     return;
 412
 413   PREFIX_COPY_IPV6(&p, CONNECTED_PREFIX(ifc));
 414
 415   apply_mask_ipv6 (&p);
 416
 417   if (IN6_IS_ADDR_UNSPECIFIED (&p.prefix))
 418     return;
 419
 420   rib_delete_ipv6 (ZEBRA_ROUTE_CONNECT, 0, &p, NULL, ifp->ifindex, 0);
 421
 422   rib_update ();
 423 }
 424
 425 void
 426 connected_delete_ipv6 (struct interface *ifp, struct in6_addr *address,
 427                        u_char prefixlen, struct in6_addr *broad)
 428 {
 429   struct prefix_ipv6 p;
 430   struct connected *ifc;
 431
 432   memset (&p, 0, sizeof (struct prefix_ipv6));
 433   p.family = AF_INET6;
 434   memcpy (&p.prefix, address, sizeof (struct in6_addr));
 435   p.prefixlen = prefixlen;
 436
 437   ifc = connected_check (ifp, (struct prefix *) &p);
 438   if (! ifc)
 439     return;
 440
 441   connected_withdraw (ifc);
 442
 443   rib_update();
 444 }
 445 #endif /* HAVE_IPV6 */