Line data    Source code

       1             : /*
       2             :  * SRC-DEST Routing Table
       3             :  *
       4             :  * Copyright (C) 2017 by David Lamparter & Christian Franke,
       5             :  *                       Open Source Routing / NetDEF Inc.
       6             :  *
       7             :  * This file is part of FRRouting (FRR)
       8             :  *
       9             :  * FRR is free software; you can redistribute it and/or modify it
      10             :  * under the terms of the GNU General Public License as published by the
      11             :  * Free Software Foundation; either version 2, or (at your option) any
      12             :  * later version.
      13             :  *
      14             :  * FRR is distributed in the hope that it will be useful, but
      15             :  * WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU General Public License along
      20             :  * with this program; see the file COPYING; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : #ifndef _ZEBRA_SRC_DEST_TABLE_H
      25             : #define _ZEBRA_SRC_DEST_TABLE_H
      26             : 
      27             : /* old/IPv4/non-srcdest:
      28             :  * table -> route_node .info -> [obj]
      29             :  *
      30             :  * new/IPv6/srcdest:
      31             :  * table -...-> srcdest_rnode [prefix = dest] .info -> [obj]
      32             :  *                                            .src_table ->
      33             :  *         srcdest table -...-> route_node [prefix = src] .info -> [obj]
      34             :  *
      35             :  * non-srcdest routes (src = ::/0) are treated just like before, their
      36             :  * information being directly there in the info pointer.
      37             :  *
      38             :  * srcdest routes are found by looking up destination first, then looking
      39             :  * up the source in the "src_table".  src_table contains normal route_nodes,
      40             :  * whose prefix is the _source_ prefix.
      41             :  *
      42             :  * NB: info can be NULL on the destination rnode, if there are only srcdest
      43             :  * routes for a particular destination prefix.
      44             :  */
      45             : 
      46             : #include "prefix.h"
      47             : #include "table.h"
      48             : 
      49             : #ifdef __cplusplus
      50             : extern "C" {
      51             : #endif
      52             : 
      53             : #define SRCDEST2STR_BUFFER (2*PREFIX2STR_BUFFER + sizeof(" from "))
      54             : 
      55             : /* extended route node for IPv6 srcdest routing */
      56             : struct srcdest_rnode;
      57             : 
      58             : extern route_table_delegate_t _srcdest_dstnode_delegate;
      59             : extern route_table_delegate_t _srcdest_srcnode_delegate;
      60             : 
      61             : extern struct route_table *srcdest_table_init(void);
      62             : extern struct route_node *srcdest_rnode_get(struct route_table *table,
      63             :                                             union prefixconstptr dst_pu,
      64             :                                             const struct prefix_ipv6 *src_p);
      65             : extern struct route_node *srcdest_rnode_lookup(struct route_table *table,
      66             :                                                union prefixconstptr dst_pu,
      67             :                                                const struct prefix_ipv6 *src_p);
      68             : extern void srcdest_rnode_prefixes(const struct route_node *rn,
      69             :                                    const struct prefix **p,
      70             :                                    const struct prefix **src_p);
      71             : extern const char *srcdest2str(const struct prefix *dst_p,
      72             :                                const struct prefix_ipv6 *src_p,
      73             :                                char *str, int size);
      74             : extern const char *srcdest_rnode2str(const struct route_node *rn, char *str,
      75             :                                      int size);
      76             : extern struct route_node *srcdest_route_next(struct route_node *rn);
      77             : 
      78         248 : static inline int rnode_is_dstnode(const struct route_node *rn)
      79             : {
      80         186 :         return rn->table->delegate == &_srcdest_dstnode_delegate;
      81             : }
      82             : 
      83         262 : static inline int rnode_is_srcnode(const struct route_node *rn)
      84             : {
      85         262 :         return rn->table->delegate == &_srcdest_srcnode_delegate;
      86             : }
      87             : 
      88         154 : static inline struct route_table *srcdest_rnode_table(struct route_node *rn)
      89             : {
      90         104 :         if (rnode_is_srcnode(rn)) {
      91           0 :                 struct route_node *dst_rn =
      92           0 :                         (struct route_node *)route_table_get_info(rn->table);
      93           0 :                 return dst_rn->table;
      94             :         } else {
      95             :                 return rn->table;
      96             :         }
      97             : }
      98          50 : static inline void *srcdest_rnode_table_info(struct route_node *rn)
      99             : {
     100          50 :         return route_table_get_info(srcdest_rnode_table(rn));
     101             : }
     102             : 
     103             : extern struct route_table *srcdest_srcnode_table(struct route_node *rn);
     104             : 
     105             : #ifdef __cplusplus
     106             : }
     107             : #endif
     108             : 
     109             : #endif /* _ZEBRA_SRC_DEST_TABLE_H */