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718e3744 | 1 | /* |
2 | * OSPF AS Boundary Router functions. | |
3 | * Copyright (C) 1999, 2000 Kunihiro Ishiguro, Toshiaki Takada | |
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 | * | |
896014f4 DL |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; see the file COPYING; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
718e3744 | 20 | */ |
21 | ||
22 | #include <zebra.h> | |
23 | ||
24 | #include "thread.h" | |
25 | #include "memory.h" | |
26 | #include "linklist.h" | |
27 | #include "prefix.h" | |
28 | #include "if.h" | |
29 | #include "table.h" | |
30 | #include "vty.h" | |
31 | #include "filter.h" | |
32 | #include "log.h" | |
33 | ||
34 | #include "ospfd/ospfd.h" | |
35 | #include "ospfd/ospf_interface.h" | |
36 | #include "ospfd/ospf_asbr.h" | |
37 | #include "ospfd/ospf_lsa.h" | |
38 | #include "ospfd/ospf_lsdb.h" | |
39 | #include "ospfd/ospf_neighbor.h" | |
40 | #include "ospfd/ospf_spf.h" | |
41 | #include "ospfd/ospf_flood.h" | |
42 | #include "ospfd/ospf_route.h" | |
43 | #include "ospfd/ospf_zebra.h" | |
44 | #include "ospfd/ospf_dump.h" | |
e84cc647 | 45 | |
6b0655a2 | 46 | |
718e3744 | 47 | /* Remove external route. */ |
d62a17ae | 48 | void ospf_external_route_remove(struct ospf *ospf, struct prefix_ipv4 *p) |
718e3744 | 49 | { |
d62a17ae | 50 | struct route_node *rn; |
51 | struct ospf_route * or ; | |
52 | ||
53 | rn = route_node_lookup(ospf->old_external_route, (struct prefix *)p); | |
54 | if (rn) | |
55 | if ((or = rn->info)) { | |
56 | zlog_info("Route[%s/%d]: external path deleted", | |
57 | inet_ntoa(p->prefix), p->prefixlen); | |
58 | ||
59 | /* Remove route from zebra. */ | |
60 | if (or->type == OSPF_DESTINATION_NETWORK) | |
b5a8894d CS |
61 | ospf_zebra_delete(ospf, |
62 | (struct prefix_ipv4 *)&rn->p, | |
d62a17ae | 63 | or); |
64 | ||
65 | ospf_route_free(or); | |
66 | rn->info = NULL; | |
67 | ||
68 | route_unlock_node(rn); | |
69 | route_unlock_node(rn); | |
70 | return; | |
71 | } | |
72 | ||
73 | zlog_info("Route[%s/%d]: no such external path", inet_ntoa(p->prefix), | |
74 | p->prefixlen); | |
718e3744 | 75 | } |
76 | ||
77 | /* Lookup external route. */ | |
d62a17ae | 78 | struct ospf_route *ospf_external_route_lookup(struct ospf *ospf, |
79 | struct prefix_ipv4 *p) | |
718e3744 | 80 | { |
d62a17ae | 81 | struct route_node *rn; |
718e3744 | 82 | |
d62a17ae | 83 | rn = route_node_lookup(ospf->old_external_route, (struct prefix *)p); |
84 | if (rn) { | |
85 | route_unlock_node(rn); | |
86 | if (rn->info) | |
87 | return rn->info; | |
88 | } | |
718e3744 | 89 | |
d62a17ae | 90 | zlog_warn("Route[%s/%d]: lookup, no such prefix", inet_ntoa(p->prefix), |
91 | p->prefixlen); | |
718e3744 | 92 | |
d62a17ae | 93 | return NULL; |
718e3744 | 94 | } |
95 | ||
6b0655a2 | 96 | |
718e3744 | 97 | /* Add an External info for AS-external-LSA. */ |
d62a17ae | 98 | struct external_info *ospf_external_info_new(u_char type, u_short instance) |
718e3744 | 99 | { |
d62a17ae | 100 | struct external_info *new; |
718e3744 | 101 | |
d62a17ae | 102 | new = (struct external_info *)XCALLOC(MTYPE_OSPF_EXTERNAL_INFO, |
103 | sizeof(struct external_info)); | |
104 | new->type = type; | |
105 | new->instance = instance; | |
718e3744 | 106 | |
d62a17ae | 107 | ospf_reset_route_map_set_values(&new->route_map_set); |
108 | return new; | |
718e3744 | 109 | } |
110 | ||
d62a17ae | 111 | static void ospf_external_info_free(struct external_info *ei) |
718e3744 | 112 | { |
d62a17ae | 113 | XFREE(MTYPE_OSPF_EXTERNAL_INFO, ei); |
718e3744 | 114 | } |
115 | ||
d62a17ae | 116 | void ospf_reset_route_map_set_values(struct route_map_set_values *values) |
718e3744 | 117 | { |
d62a17ae | 118 | values->metric = -1; |
119 | values->metric_type = -1; | |
718e3744 | 120 | } |
121 | ||
d62a17ae | 122 | int ospf_route_map_set_compare(struct route_map_set_values *values1, |
123 | struct route_map_set_values *values2) | |
718e3744 | 124 | { |
d62a17ae | 125 | return values1->metric == values2->metric |
126 | && values1->metric_type == values2->metric_type; | |
718e3744 | 127 | } |
128 | ||
129 | /* Add an External info for AS-external-LSA. */ | |
d62a17ae | 130 | struct external_info *ospf_external_info_add(u_char type, u_short instance, |
131 | struct prefix_ipv4 p, | |
132 | ifindex_t ifindex, | |
133 | struct in_addr nexthop, | |
134 | route_tag_t tag) | |
718e3744 | 135 | { |
d62a17ae | 136 | struct external_info *new; |
137 | struct route_node *rn; | |
138 | struct ospf_external *ext; | |
139 | char inetbuf[INET6_BUFSIZ]; | |
140 | ||
141 | ext = ospf_external_lookup(type, instance); | |
142 | if (!ext) | |
143 | ext = ospf_external_add(type, instance); | |
144 | ||
145 | rn = route_node_get(EXTERNAL_INFO(ext), (struct prefix *)&p); | |
146 | /* If old info exists, -- discard new one or overwrite with new one? */ | |
147 | if (rn) | |
148 | if (rn->info) { | |
149 | new = rn->info; | |
150 | if ((new->ifindex == ifindex) | |
151 | && (new->nexthop.s_addr == nexthop.s_addr) | |
152 | && (new->tag == tag)) { | |
153 | route_unlock_node(rn); | |
154 | return NULL; /* NULL => no LSA to refresh */ | |
155 | } | |
156 | ||
157 | inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, | |
158 | INET6_BUFSIZ); | |
159 | zlog_warn( | |
160 | "Redistribute[%s][%d]: %s/%d discarding old info with NH %s.", | |
161 | ospf_redist_string(type), instance, | |
162 | inet_ntoa(p.prefix), p.prefixlen, inetbuf); | |
163 | XFREE(MTYPE_OSPF_EXTERNAL_INFO, rn->info); | |
164 | rn->info = NULL; | |
165 | } | |
166 | ||
167 | /* Create new External info instance. */ | |
168 | new = ospf_external_info_new(type, instance); | |
169 | new->p = p; | |
170 | new->ifindex = ifindex; | |
171 | new->nexthop = nexthop; | |
172 | new->tag = tag; | |
173 | ||
174 | /* we don't unlock rn from the get() because we're attaching the info */ | |
175 | if (rn) | |
176 | rn->info = new; | |
177 | ||
178 | if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) { | |
179 | inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, | |
180 | INET6_BUFSIZ); | |
181 | zlog_debug( | |
182 | "Redistribute[%s]: %s/%d external info created, with NH %s", | |
183 | ospf_redist_string(type), inet_ntoa(p.prefix), | |
184 | p.prefixlen, inetbuf); | |
185 | } | |
186 | return new; | |
718e3744 | 187 | } |
188 | ||
d62a17ae | 189 | void ospf_external_info_delete(u_char type, u_short instance, |
190 | struct prefix_ipv4 p) | |
718e3744 | 191 | { |
d62a17ae | 192 | struct route_node *rn; |
193 | struct ospf_external *ext; | |
194 | ||
195 | ext = ospf_external_lookup(type, instance); | |
196 | if (!ext) | |
197 | return; | |
198 | ||
199 | rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p); | |
200 | if (rn) { | |
201 | ospf_external_info_free(rn->info); | |
202 | rn->info = NULL; | |
203 | route_unlock_node(rn); | |
204 | route_unlock_node(rn); | |
205 | } | |
718e3744 | 206 | } |
207 | ||
d62a17ae | 208 | struct external_info *ospf_external_info_lookup(u_char type, u_short instance, |
209 | struct prefix_ipv4 *p) | |
718e3744 | 210 | { |
d62a17ae | 211 | struct route_node *rn; |
212 | struct ospf_external *ext; | |
213 | ||
214 | ext = ospf_external_lookup(type, instance); | |
215 | if (!ext) | |
216 | return NULL; | |
217 | ||
218 | rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)p); | |
219 | if (rn) { | |
220 | route_unlock_node(rn); | |
221 | if (rn->info) | |
222 | return rn->info; | |
223 | } | |
224 | ||
225 | return NULL; | |
718e3744 | 226 | } |
227 | ||
d62a17ae | 228 | struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf, |
229 | struct prefix_ipv4 *p) | |
718e3744 | 230 | { |
d62a17ae | 231 | struct ospf_lsa *lsa; |
232 | struct as_external_lsa *al; | |
233 | struct in_addr mask, id; | |
718e3744 | 234 | |
d62a17ae | 235 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, |
236 | p->prefix, ospf->router_id); | |
718e3744 | 237 | |
d62a17ae | 238 | if (!lsa) |
239 | return NULL; | |
718e3744 | 240 | |
d62a17ae | 241 | al = (struct as_external_lsa *)lsa->data; |
718e3744 | 242 | |
d62a17ae | 243 | masklen2ip(p->prefixlen, &mask); |
718e3744 | 244 | |
d62a17ae | 245 | if (mask.s_addr != al->mask.s_addr) { |
246 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
247 | lsa = ospf_lsdb_lookup_by_id(ospf->lsdb, OSPF_AS_EXTERNAL_LSA, | |
248 | id, ospf->router_id); | |
249 | if (!lsa) | |
250 | return NULL; | |
251 | } | |
718e3744 | 252 | |
d62a17ae | 253 | return lsa; |
718e3744 | 254 | } |
255 | ||
6b0655a2 | 256 | |
718e3744 | 257 | /* Update ASBR status. */ |
d62a17ae | 258 | void ospf_asbr_status_update(struct ospf *ospf, u_char status) |
718e3744 | 259 | { |
d62a17ae | 260 | zlog_info("ASBR[Status:%d]: Update", status); |
261 | ||
262 | /* ASBR on. */ | |
263 | if (status) { | |
264 | /* Already ASBR. */ | |
265 | if (IS_OSPF_ASBR(ospf)) { | |
266 | zlog_info("ASBR[Status:%d]: Already ASBR", status); | |
267 | return; | |
268 | } | |
269 | SET_FLAG(ospf->flags, OSPF_FLAG_ASBR); | |
270 | } else { | |
271 | /* Already non ASBR. */ | |
272 | if (!IS_OSPF_ASBR(ospf)) { | |
273 | zlog_info("ASBR[Status:%d]: Already non ASBR", status); | |
274 | return; | |
275 | } | |
276 | UNSET_FLAG(ospf->flags, OSPF_FLAG_ASBR); | |
718e3744 | 277 | } |
718e3744 | 278 | |
d62a17ae | 279 | /* Transition from/to status ASBR, schedule timer. */ |
280 | ospf_spf_calculate_schedule(ospf, SPF_FLAG_ASBR_STATUS_CHANGE); | |
281 | ospf_router_lsa_update(ospf); | |
718e3744 | 282 | } |
283 | ||
d62a17ae | 284 | void ospf_redistribute_withdraw(struct ospf *ospf, u_char type, |
285 | u_short instance) | |
718e3744 | 286 | { |
d62a17ae | 287 | struct route_node *rn; |
288 | struct external_info *ei; | |
289 | struct ospf_external *ext; | |
290 | ||
291 | ext = ospf_external_lookup(type, instance); | |
292 | if (!ext) | |
293 | return; | |
294 | ||
295 | /* Delete external info for specified type. */ | |
296 | if (EXTERNAL_INFO(ext)) | |
297 | for (rn = route_top(EXTERNAL_INFO(ext)); rn; | |
298 | rn = route_next(rn)) | |
299 | if ((ei = rn->info)) | |
300 | if (ospf_external_info_find_lsa(ospf, &ei->p)) { | |
301 | if (is_prefix_default(&ei->p) | |
302 | && ospf->default_originate | |
303 | != DEFAULT_ORIGINATE_NONE) | |
304 | continue; | |
305 | ospf_external_lsa_flush( | |
306 | ospf, type, &ei->p, | |
307 | ei->ifindex /*, ei->nexthop */); | |
308 | ||
309 | ospf_external_info_free(ei); | |
310 | route_unlock_node(rn); | |
311 | rn->info = NULL; | |
312 | } | |
718e3744 | 313 | } |