eigrpd/eigrp_filter.c

   1 /*
   2  * EIGRP Filter Functions.
   3  * Copyright (C) 2013-2015
   4  * Authors:
   5  *   Donnie Savage
   6  *   Jan Janovic
   7  *   Matej Perina
   8  *   Peter Orsag
   9  *   Peter Paluch
  10  *   Frantisek Gazo
  11  *   Tomas Hvorkovy
  12  *   Martin Kontsek
  13  *   Lukas Koribsky
  14  *
  15  *
  16  * This file is part of GNU Zebra.
  17  *
  18  * GNU Zebra is free software; you can redistribute it and/or modify it
  19  * under the terms of the GNU General Public License as published by the
  20  * Free Software Foundation; either version 2, or (at your option) any
  21  * later version.
  22  *
  23  * GNU Zebra is distributed in the hope that it will be useful, but
  24  * WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  26  * General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License along
  29  * with this program; see the file COPYING; if not, write to the Free Software
  30  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  31  */
  32
  33 #include <zebra.h>
  34
  35 #include "if.h"
  36 #include "command.h"
  37 #include "prefix.h"
  38 #include "table.h"
  39 #include "thread.h"
  40 #include "memory.h"
  41 #include "log.h"
  42 #include "stream.h"
  43 #include "filter.h"
  44 #include "sockunion.h"
  45 #include "sockopt.h"
  46 #include "routemap.h"
  47 #include "if_rmap.h"
  48 #include "plist.h"
  49 #include "distribute.h"
  50 #include "md5.h"
  51 #include "keychain.h"
  52 #include "privs.h"
  53 #include "vrf.h"
  54
  55 #include "eigrpd/eigrp_structs.h"
  56 #include "eigrpd/eigrpd.h"
  57 #include "eigrpd/eigrp_const.h"
  58 #include "eigrpd/eigrp_filter.h"
  59 #include "eigrpd/eigrp_packet.h"
  60 #include "eigrpd/eigrp_memory.h"
  61
  62 /*
  63  * Distribute-list update functions.
  64  */
  65 void eigrp_distribute_update(struct distribute *dist)
  66 {
  67         struct interface *ifp;
  68         struct eigrp_interface *ei = NULL;
  69         struct access_list *alist;
  70         struct prefix_list *plist;
  71         // struct route_map *routemap;
  72         struct eigrp *e;
  73
  74         /* if no interface address is present, set list to eigrp process struct
  75          */
  76         e = eigrp_lookup();
  77
  78         /* Check if distribute-list was set for process or interface */
  79         if (!dist->ifname) {
  80                 /* access list IN for whole process */
  81                 if (dist->list[DISTRIBUTE_V4_IN]) {
  82                         alist = access_list_lookup(
  83                                 AFI_IP, dist->list[DISTRIBUTE_V4_IN]);
  84                         if (alist)
  85                                 e->list[EIGRP_FILTER_IN] = alist;
  86                         else
  87                                 e->list[EIGRP_FILTER_IN] = NULL;
  88                 } else {
  89                         e->list[EIGRP_FILTER_IN] = NULL;
  90                 }
  91
  92                 /* access list OUT for whole process */
  93                 if (dist->list[DISTRIBUTE_V4_OUT]) {
  94                         alist = access_list_lookup(
  95                                 AFI_IP, dist->list[DISTRIBUTE_V4_OUT]);
  96                         if (alist)
  97                                 e->list[EIGRP_FILTER_OUT] = alist;
  98                         else
  99                                 e->list[EIGRP_FILTER_OUT] = NULL;
 100                 } else {
 101                         e->list[EIGRP_FILTER_OUT] = NULL;
 102                 }
 103
 104                 /* PREFIX_LIST IN for process */
 105                 if (dist->prefix[DISTRIBUTE_V4_IN]) {
 106                         plist = prefix_list_lookup(
 107                                 AFI_IP, dist->prefix[DISTRIBUTE_V4_IN]);
 108                         if (plist) {
 109                                 e->prefix[EIGRP_FILTER_IN] = plist;
 110                         } else
 111                                 e->prefix[EIGRP_FILTER_IN] = NULL;
 112                 } else
 113                         e->prefix[EIGRP_FILTER_IN] = NULL;
 114
 115                 /* PREFIX_LIST OUT for process */
 116                 if (dist->prefix[DISTRIBUTE_V4_OUT]) {
 117                         plist = prefix_list_lookup(
 118                                 AFI_IP, dist->prefix[DISTRIBUTE_V4_OUT]);
 119                         if (plist) {
 120                                 e->prefix[EIGRP_FILTER_OUT] = plist;
 121
 122                         } else
 123                                 e->prefix[EIGRP_FILTER_OUT] = NULL;
 124                 } else
 125                         e->prefix[EIGRP_FILTER_OUT] = NULL;
 126
 127 // This is commented out, because the distribute.[ch] code
 128 // changes looked poorly written from first glance
 129 // commit was 133bdf2d
 130 // TODO: DBS
 131 #if 0
 132       /* route-map IN for whole process */
 133       if (dist->route[DISTRIBUTE_V4_IN])
 134         {
 135           routemap = route_map_lookup_by_name (dist->route[DISTRIBUTE_V4_IN]);
 136           if (routemap)
 137             e->routemap[EIGRP_FILTER_IN] = routemap;
 138           else
 139             e->routemap[EIGRP_FILTER_IN] = NULL;
 140         }
 141       else
 142         {
 143           e->routemap[EIGRP_FILTER_IN] = NULL;
 144         }
 145
 146       /* route-map OUT for whole process */
 147       if (dist->route[DISTRIBUTE_V4_OUT])
 148         {
 149           routemap = route_map_lookup_by_name (dist->route[DISTRIBUTE_V4_OUT]);
 150           if (routemap)
 151             e->routemap[EIGRP_FILTER_OUT] = routemap;
 152           else
 153             e->routemap[EIGRP_FILTER_OUT] = NULL;
 154         }
 155       else
 156         {
 157           e->routemap[EIGRP_FILTER_OUT] = NULL;
 158         }
 159 #endif
 160                 // TODO: check Graceful restart after 10sec
 161
 162                 /* check if there is already GR scheduled */
 163                 if (e->t_distribute != NULL) {
 164                         /* if is, cancel schedule */
 165                         thread_cancel(e->t_distribute);
 166                 }
 167                 /* schedule Graceful restart for whole process in 10sec */
 168                 e->t_distribute = NULL;
 169                 thread_add_timer(master, eigrp_distribute_timer_process, e,
 170                                  (10), &e->t_distribute);
 171
 172                 return;
 173         }
 174
 175         ifp = if_lookup_by_name(dist->ifname, VRF_DEFAULT);
 176         if (ifp == NULL)
 177                 return;
 178
 179         /*struct eigrp_if_info * info = ifp->info;
 180         ei = info->eigrp_interface;*/
 181         struct listnode *node, *nnode;
 182         struct eigrp_interface *ei2;
 183         /* Find proper interface */
 184         for (ALL_LIST_ELEMENTS(e->eiflist, node, nnode, ei2)) {
 185                 if (strcmp(ei2->ifp->name, ifp->name) == 0) {
 186                         ei = ei2;
 187                         break;
 188                 }
 189         }
 190
 191         /* Access-list for interface in */
 192         if (dist->list[DISTRIBUTE_V4_IN]) {
 193                 alist = access_list_lookup(AFI_IP,
 194                                            dist->list[DISTRIBUTE_V4_IN]);
 195                 if (alist) {
 196                         ei->list[EIGRP_FILTER_IN] = alist;
 197                 } else
 198                         ei->list[EIGRP_FILTER_IN] = NULL;
 199         } else {
 200                 ei->list[EIGRP_FILTER_IN] = NULL;
 201         }
 202
 203         /* Access-list for interface in */
 204         if (dist->list[DISTRIBUTE_V4_OUT]) {
 205                 alist = access_list_lookup(AFI_IP,
 206                                            dist->list[DISTRIBUTE_V4_OUT]);
 207                 if (alist)
 208                         ei->list[EIGRP_FILTER_OUT] = alist;
 209                 else
 210                         ei->list[EIGRP_FILTER_OUT] = NULL;
 211
 212         } else
 213                 ei->list[EIGRP_FILTER_OUT] = NULL;
 214
 215         /* Prefix-list for interface in */
 216         if (dist->prefix[DISTRIBUTE_V4_IN]) {
 217                 plist = prefix_list_lookup(AFI_IP,
 218                                            dist->prefix[DISTRIBUTE_V4_IN]);
 219                 if (plist)
 220                         ei->prefix[EIGRP_FILTER_IN] = plist;
 221                 else
 222                         ei->prefix[EIGRP_FILTER_IN] = NULL;
 223         } else
 224                 ei->prefix[EIGRP_FILTER_IN] = NULL;
 225
 226         /* Prefix-list for interface out */
 227         if (dist->prefix[DISTRIBUTE_V4_OUT]) {
 228                 plist = prefix_list_lookup(AFI_IP,
 229                                            dist->prefix[DISTRIBUTE_V4_OUT]);
 230                 if (plist)
 231                         ei->prefix[EIGRP_FILTER_OUT] = plist;
 232                 else
 233                         ei->prefix[EIGRP_FILTER_OUT] = NULL;
 234         } else
 235                 ei->prefix[EIGRP_FILTER_OUT] = NULL;
 236
 237 #if 0
 238   /* route-map IN for whole process */
 239   if (dist->route[DISTRIBUTE_V4_IN])
 240     {
 241       zlog_info("<DEBUG ACL ALL in");
 242       routemap = route_map_lookup_by_name (dist->route[DISTRIBUTE_V4_IN]);
 243       if (routemap)
 244         ei->routemap[EIGRP_FILTER_IN] = routemap;
 245       else
 246         ei->routemap[EIGRP_FILTER_IN] = NULL;
 247     }
 248   else
 249     {
 250       ei->routemap[EIGRP_FILTER_IN] = NULL;
 251     }
 252
 253   /* route-map OUT for whole process */
 254   if (dist->route[DISTRIBUTE_V4_OUT])
 255     {
 256       routemap = route_map_lookup_by_name (dist->route[DISTRIBUTE_V4_OUT]);
 257       if (routemap)
 258         ei->routemap[EIGRP_FILTER_OUT] = routemap;
 259       else
 260         ei->routemap[EIGRP_FILTER_OUT] = NULL;
 261     }
 262   else
 263     {
 264       ei->routemap[EIGRP_FILTER_OUT] = NULL;
 265     }
 266 #endif
 267         // TODO: check Graceful restart after 10sec
 268
 269         /* check if there is already GR scheduled */
 270         if (ei->t_distribute != NULL) {
 271                 /* if is, cancel schedule */
 272                 thread_cancel(ei->t_distribute);
 273         }
 274         /* schedule Graceful restart for interface in 10sec */
 275         e->t_distribute = NULL;
 276         thread_add_timer(master, eigrp_distribute_timer_interface, ei, 10,
 277                          &e->t_distribute);
 278 }
 279
 280 /*
 281  * Function called by prefix-list and access-list update
 282  */
 283 void eigrp_distribute_update_interface(struct interface *ifp)
 284 {
 285         struct distribute *dist;
 286
 287         dist = distribute_lookup(ifp->name);
 288         if (dist)
 289                 eigrp_distribute_update(dist);
 290 }
 291
 292 /* Update all interface's distribute list.
 293  * Function used in hook for prefix-list
 294  */
 295 void eigrp_distribute_update_all(struct prefix_list *notused)
 296 {
 297         struct interface *ifp;
 298         struct listnode *node, *nnode;
 299
 300         for (ALL_LIST_ELEMENTS(vrf_iflist(VRF_DEFAULT), node, nnode, ifp))
 301                 eigrp_distribute_update_interface(ifp);
 302 }
 303
 304 /*
 305  * Function used in hook for acces-list
 306  */
 307 void eigrp_distribute_update_all_wrapper(struct access_list *notused)
 308 {
 309         eigrp_distribute_update_all(NULL);
 310 }
 311
 312 /*
 313  * @fn eigrp_distribute_timer_process
 314  *
 315  * @param[in]   thread  current execution thread timer is associated with
 316  *
 317  * @return int  always returns 0
 318  *
 319  * @par
 320  * Called when 10sec waiting time expire and
 321  * executes Graceful restart for whole process
 322  */
 323 int eigrp_distribute_timer_process(struct thread *thread)
 324 {
 325         struct eigrp *eigrp;
 326
 327         eigrp = THREAD_ARG(thread);
 328         eigrp->t_distribute = NULL;
 329
 330         /* execute GR for whole process */
 331         eigrp_update_send_process_GR(eigrp, EIGRP_GR_FILTER, NULL);
 332
 333         return 0;
 334 }
 335
 336 /*
 337  * @fn eigrp_distribute_timer_interface
 338  *
 339  * @param[in]   thread  current execution thread timer is associated with
 340  *
 341  * @return int  always returns 0
 342  *
 343  * @par
 344  * Called when 10sec waiting time expire and
 345  * executes Graceful restart for interface
 346  */
 347 int eigrp_distribute_timer_interface(struct thread *thread)
 348 {
 349         struct eigrp_interface *ei;
 350
 351         ei = THREAD_ARG(thread);
 352         ei->t_distribute = NULL;
 353
 354         /* execute GR for interface */
 355         eigrp_update_send_interface_GR(ei, EIGRP_GR_FILTER, NULL);
 356
 357         return 0;
 358 }