diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/routemap.c | 205 |
1 files changed, 110 insertions, 95 deletions
diff --git a/lib/routemap.c b/lib/routemap.c index b000f2fc..68ac23d3 100644 --- a/lib/routemap.c +++ b/lib/routemap.c @@ -634,122 +634,137 @@ route_map_delete_set (struct route_map_index *index, char *set_name, return 1; } -/* Apply route map's each index to the object. */ -/* -** The matrix for a route-map looks like this: -** (note, this includes the description for the "NEXT" -** and "GOTO" frobs now -** -** Match | No Match -** | -** permit a | c -** | -** ------------------+--------------- -** | -** deny b | d -** | -** -** a) Apply Set statements, accept route -** If NEXT is specified, goto NEXT statement -** If GOTO is specified, goto the first clause where pref > nextpref -** If nothing is specified, do as Cisco and finish -** b) Finish route-map processing, and deny route -** c) & d) Goto Next index -** -** If we get no matches after we've processed all updates, then the route -** is dropped too. -** -** Some notes on the new "NEXT" and "GOTO" -** on-match next - If this clause is matched, then the set statements -** are executed and then we drop through to the next clause -** on-match goto n - If this clause is matched, then the set statments -** are executed and then we goto the nth clause, or the -** first clause greater than this. In order to ensure -** route-maps *always* exit, you cannot jump backwards. -** Sorry ;) -** -** We need to make sure our route-map processing matches the above +/* Apply route map's each index to the object. + + The matrix for a route-map looks like this: + (note, this includes the description for the "NEXT" + and "GOTO" frobs now + + Match | No Match + | + permit action | cont + | + ------------------+--------------- + | + deny deny | cont + | + + action) Apply Set statements, accept route + If NEXT is specified, goto NEXT statement + If GOTO is specified, goto the first clause where pref > nextpref + If nothing is specified, do as Cisco and finish + deny) If NEXT is specified, goto NEXT statement + If nothing is specified, finally will be denied by route-map. + cont) Goto Next index + + If we get no matches after we've processed all updates, then the route + is dropped too. + + Some notes on the new "NEXT" and "GOTO" + on-match next - If this clause is matched, then the set statements + are executed and then we drop through to the next clause + on-match goto n - If this clause is matched, then the set statments + are executed and then we goto the nth clause, or the + first clause greater than this. In order to ensure + route-maps *always* exit, you cannot jump backwards. + Sorry ;) + + We need to make sure our route-map processing matches the above */ + route_map_result_t -route_map_apply_index (struct route_map_index *index, struct prefix *prefix, - route_map_object_t type, void *object) +route_map_apply_match (struct route_map_rule_list *match_list, + struct prefix *prefix, route_map_object_t type, + void *object) { - int ret; + route_map_result_t ret = RMAP_NOMATCH; struct route_map_rule *match; - struct route_map_rule *set; - - /* Check all match rule and if there is no match rule return 0. */ - for (match = index->match_list.head; match; match = match->next) - { - /* Try each match statement in turn. If any return something - other than RM_MATCH then we don't need to check anymore and can - return */ - ret = (*match->cmd->func_apply)(match->value, prefix, type, object); - if (ret != RMAP_MATCH) - return ret; - } - /* We get here if all match statements matched From the matrix - above, if this is PERMIT we go on and apply the SET functions. If - we're deny, we return indicating we matched a deny */ - /* Apply set statement to the object. */ - if (index->type == RMAP_PERMIT) - { - for (set = index->set_list.head; set; set = set->next) - { - ret = (*set->cmd->func_apply)(set->value, prefix, type, object); - } - return RMAP_MATCH; - } - else + /* Check all match rule and if there is no match rule, go to the + set statement. */ + if (!match_list->head) + ret = RMAP_MATCH; + else { - return RMAP_DENYMATCH; + for (match = match_list->head; match; match = match->next) + { + /* Try each match statement in turn, If any do not return + RMAP_MATCH, return, otherwise continue on to next match + statement. All match statements must match for end-result + to be a match. */ + ret = (*match->cmd->func_apply) (match->value, prefix, + type, object); + if (ret != RMAP_MATCH) + return ret; + } } - /* Should not get here! */ - return RMAP_MATCH; + return ret; } /* Apply route map to the object. */ route_map_result_t -route_map_apply (struct route_map *map, struct prefix *prefix, - route_map_object_t type, void *object) +route_map_apply (struct route_map *map, struct prefix *prefix, + route_map_object_t type, void *object) { int ret = 0; struct route_map_index *index; + struct route_map_rule *set; if (map == NULL) return RMAP_DENYMATCH; for (index = map->head; index; index = index->next) { - /* Apply this index. End here if we get a RM_NOMATCH */ - ret = route_map_apply_index (index, prefix, type, object); - - if (ret != RMAP_NOMATCH) - { - /* We now have to handle the NEXT and GOTO clauses */ - if(index->exitpolicy == RMAP_EXIT) - return ret; - if(index->exitpolicy == RMAP_GOTO) - { - /* Find the next clause to jump to */ - struct route_map_index *next; - - next = index->next; - while (next && next->pref < index->nextpref) - { - index = next; - next = next->next; - } - if (next == NULL) - { - /* No clauses match! */ - return ret; - } - } - /* Otherwise, we fall through as it was a NEXT */ - } + /* Apply this index. */ + ret = route_map_apply_match (&index->match_list, prefix, type, object); + + /* Now we apply the matrix from above */ + if (ret == RMAP_NOMATCH) + /* 'cont' from matrix - continue to next route-map sequence */ + continue; + else if (ret == RMAP_MATCH) + { + if (index->type == RMAP_PERMIT) + /* 'action' */ + { + /* permit+match must execute sets */ + for (set = index->set_list.head; set; set = set->next) + ret = (*set->cmd->func_apply) (set->value, prefix, + type, object); + switch (index->exitpolicy) + { + case RMAP_EXIT: + return ret; + case RMAP_NEXT: + continue; + case RMAP_GOTO: + { + /* Find the next clause to jump to */ + struct route_map_index *next = index->next; + + while (next && next->pref < index->nextpref) + { + index = next; + next = next->next; + } + if (next == NULL) + { + /* No clauses match! */ + return ret; + } + } + } + } + else if (index->type == RMAP_DENY) + /* 'deny' */ + { + if (index->exitpolicy == RMAP_NEXT) + continue; + else + return RMAP_DENYMATCH; + } + } } /* Finally route-map does not match at all. */ return RMAP_DENYMATCH; |