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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 | * | |
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 "thread.h" | |
26 | #include "memory.h" | |
27 | #include "linklist.h" | |
28 | #include "prefix.h" | |
29 | #include "if.h" | |
30 | #include "table.h" | |
31 | #include "vty.h" | |
32 | #include "filter.h" | |
33 | #include "log.h" | |
34 | ||
35 | #include "ospfd/ospfd.h" | |
36 | #include "ospfd/ospf_interface.h" | |
37 | #include "ospfd/ospf_asbr.h" | |
38 | #include "ospfd/ospf_lsa.h" | |
39 | #include "ospfd/ospf_lsdb.h" | |
40 | #include "ospfd/ospf_neighbor.h" | |
41 | #include "ospfd/ospf_spf.h" | |
42 | #include "ospfd/ospf_flood.h" | |
43 | #include "ospfd/ospf_route.h" | |
44 | #include "ospfd/ospf_zebra.h" | |
45 | #include "ospfd/ospf_dump.h" | |
e84cc647 | 46 | |
6b0655a2 | 47 | |
718e3744 | 48 | /* Remove external route. */ |
49 | void | |
e84cc647 | 50 | ospf_external_route_remove (struct ospf *ospf, struct prefix_ipv4 *p) |
718e3744 | 51 | { |
52 | struct route_node *rn; | |
53 | struct ospf_route *or; | |
54 | ||
e84cc647 | 55 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p); |
718e3744 | 56 | if (rn) |
57 | if ((or = rn->info)) | |
58 | { | |
59 | zlog_info ("Route[%s/%d]: external path deleted", | |
60 | inet_ntoa (p->prefix), p->prefixlen); | |
61 | ||
62 | /* Remove route from zebra. */ | |
63 | if (or->type == OSPF_DESTINATION_NETWORK) | |
64 | ospf_zebra_delete ((struct prefix_ipv4 *) &rn->p, or); | |
65 | ||
66 | ospf_route_free (or); | |
67 | rn->info = NULL; | |
68 | ||
69 | route_unlock_node (rn); | |
70 | route_unlock_node (rn); | |
71 | return; | |
72 | } | |
73 | ||
74 | zlog_info ("Route[%s/%d]: no such external path", | |
75 | inet_ntoa (p->prefix), p->prefixlen); | |
76 | } | |
77 | ||
78 | /* Lookup external route. */ | |
79 | struct ospf_route * | |
e84cc647 | 80 | ospf_external_route_lookup (struct ospf *ospf, |
81 | struct prefix_ipv4 *p) | |
718e3744 | 82 | { |
83 | struct route_node *rn; | |
84 | ||
e84cc647 | 85 | rn = route_node_lookup (ospf->old_external_route, (struct prefix *) p); |
718e3744 | 86 | if (rn) |
87 | { | |
88 | route_unlock_node (rn); | |
89 | if (rn->info) | |
90 | return rn->info; | |
91 | } | |
92 | ||
93 | zlog_warn ("Route[%s/%d]: lookup, no such prefix", | |
94 | inet_ntoa (p->prefix), p->prefixlen); | |
95 | ||
96 | return NULL; | |
97 | } | |
98 | ||
6b0655a2 | 99 | |
718e3744 | 100 | /* Add an External info for AS-external-LSA. */ |
101 | struct external_info * | |
7c8ff89e | 102 | ospf_external_info_new (u_char type, u_short instance) |
718e3744 | 103 | { |
104 | struct external_info *new; | |
105 | ||
106 | new = (struct external_info *) | |
393deb9b | 107 | XCALLOC (MTYPE_OSPF_EXTERNAL_INFO, sizeof (struct external_info)); |
718e3744 | 108 | new->type = type; |
7c8ff89e | 109 | new->instance = instance; |
718e3744 | 110 | |
111 | ospf_reset_route_map_set_values (&new->route_map_set); | |
112 | return new; | |
113 | } | |
114 | ||
4dadc291 | 115 | static void |
718e3744 | 116 | ospf_external_info_free (struct external_info *ei) |
117 | { | |
118 | XFREE (MTYPE_OSPF_EXTERNAL_INFO, ei); | |
119 | } | |
120 | ||
121 | void | |
122 | ospf_reset_route_map_set_values (struct route_map_set_values *values) | |
123 | { | |
124 | values->metric = -1; | |
125 | values->metric_type = -1; | |
126 | } | |
127 | ||
128 | int | |
129 | ospf_route_map_set_compare (struct route_map_set_values *values1, | |
130 | struct route_map_set_values *values2) | |
131 | { | |
132 | return values1->metric == values2->metric && | |
133 | values1->metric_type == values2->metric_type; | |
134 | } | |
135 | ||
136 | /* Add an External info for AS-external-LSA. */ | |
137 | struct external_info * | |
7c8ff89e | 138 | ospf_external_info_add (u_char type, u_short instance, struct prefix_ipv4 p, |
b892f1dd | 139 | ifindex_t ifindex, struct in_addr nexthop, |
dc9ffce8 | 140 | route_tag_t tag) |
718e3744 | 141 | { |
142 | struct external_info *new; | |
143 | struct route_node *rn; | |
7c8ff89e | 144 | struct ospf_external *ext; |
5048fe14 | 145 | char inetbuf[INET6_BUFSIZ]; |
718e3744 | 146 | |
7c8ff89e DS |
147 | ext = ospf_external_lookup(type, instance); |
148 | if (!ext) | |
149 | ext = ospf_external_add(type, instance); | |
718e3744 | 150 | |
7c8ff89e | 151 | rn = route_node_get (EXTERNAL_INFO (ext), (struct prefix *) &p); |
718e3744 | 152 | /* If old info exists, -- discard new one or overwrite with new one? */ |
153 | if (rn) | |
154 | if (rn->info) | |
155 | { | |
5048fe14 | 156 | new = rn->info; |
157 | if ((new->ifindex == ifindex) && | |
158 | (new->nexthop.s_addr == nexthop.s_addr) && (new->tag == tag)) | |
159 | { | |
160 | route_unlock_node(rn); | |
161 | return NULL; /* NULL => no LSA to refresh */ | |
162 | } | |
163 | ||
164 | inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, INET6_BUFSIZ); | |
165 | zlog_warn ("Redistribute[%s][%d]: %s/%d discarding old info with NH %s.", | |
7c8ff89e | 166 | ospf_redist_string(type), instance, |
5048fe14 | 167 | inet_ntoa (p.prefix), p.prefixlen, inetbuf); |
168 | XFREE (MTYPE_OSPF_EXTERNAL_INFO, rn->info); | |
169 | rn->info = NULL; | |
718e3744 | 170 | } |
171 | ||
172 | /* Create new External info instance. */ | |
7c8ff89e | 173 | new = ospf_external_info_new (type, instance); |
718e3744 | 174 | new->p = p; |
175 | new->ifindex = ifindex; | |
176 | new->nexthop = nexthop; | |
0d9551dc | 177 | new->tag = tag; |
718e3744 | 178 | |
5048fe14 | 179 | /* we don't unlock rn from the get() because we're attaching the info */ |
a11e012e RG |
180 | if (rn) |
181 | rn->info = new; | |
718e3744 | 182 | |
183 | if (IS_DEBUG_OSPF (lsa, LSA_GENERATE)) | |
5048fe14 | 184 | { |
185 | inet_ntop(AF_INET, (void *)&nexthop.s_addr, inetbuf, INET6_BUFSIZ); | |
186 | zlog_debug ("Redistribute[%s]: %s/%d external info created, with NH %s", | |
187 | ospf_redist_string(type), | |
188 | inet_ntoa (p.prefix), p.prefixlen, inetbuf); | |
189 | } | |
718e3744 | 190 | return new; |
191 | } | |
192 | ||
193 | void | |
7c8ff89e | 194 | ospf_external_info_delete (u_char type, u_short instance, struct prefix_ipv4 p) |
718e3744 | 195 | { |
196 | struct route_node *rn; | |
7c8ff89e | 197 | struct ospf_external *ext; |
718e3744 | 198 | |
7c8ff89e DS |
199 | ext = ospf_external_lookup(type, instance); |
200 | if (!ext) | |
201 | return; | |
202 | ||
203 | rn = route_node_lookup (EXTERNAL_INFO (ext), (struct prefix *) &p); | |
718e3744 | 204 | if (rn) |
205 | { | |
206 | ospf_external_info_free (rn->info); | |
207 | rn->info = NULL; | |
208 | route_unlock_node (rn); | |
209 | route_unlock_node (rn); | |
210 | } | |
211 | } | |
212 | ||
213 | struct external_info * | |
7c8ff89e | 214 | ospf_external_info_lookup (u_char type, u_short instance, struct prefix_ipv4 *p) |
718e3744 | 215 | { |
216 | struct route_node *rn; | |
7c8ff89e DS |
217 | struct ospf_external *ext; |
218 | ||
219 | ext = ospf_external_lookup(type, instance); | |
220 | if (!ext) | |
221 | return NULL; | |
222 | ||
223 | rn = route_node_lookup (EXTERNAL_INFO (ext), (struct prefix *) p); | |
718e3744 | 224 | if (rn) |
225 | { | |
226 | route_unlock_node (rn); | |
227 | if (rn->info) | |
228 | return rn->info; | |
229 | } | |
230 | ||
231 | return NULL; | |
232 | } | |
233 | ||
234 | struct ospf_lsa * | |
e84cc647 | 235 | ospf_external_info_find_lsa (struct ospf *ospf, |
236 | struct prefix_ipv4 *p) | |
718e3744 | 237 | { |
238 | struct ospf_lsa *lsa; | |
239 | struct as_external_lsa *al; | |
240 | struct in_addr mask, id; | |
241 | ||
e84cc647 | 242 | lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA, |
243 | p->prefix, ospf->router_id); | |
718e3744 | 244 | |
245 | if (!lsa) | |
246 | return NULL; | |
247 | ||
248 | al = (struct as_external_lsa *) lsa->data; | |
249 | ||
250 | masklen2ip (p->prefixlen, &mask); | |
251 | ||
252 | if (mask.s_addr != al->mask.s_addr) | |
253 | { | |
254 | id.s_addr = p->prefix.s_addr | (~mask.s_addr); | |
e84cc647 | 255 | lsa = ospf_lsdb_lookup_by_id (ospf->lsdb, OSPF_AS_EXTERNAL_LSA, |
256 | id, ospf->router_id); | |
718e3744 | 257 | if (!lsa) |
258 | return NULL; | |
259 | } | |
260 | ||
261 | return lsa; | |
262 | } | |
263 | ||
6b0655a2 | 264 | |
718e3744 | 265 | /* Update ASBR status. */ |
266 | void | |
e84cc647 | 267 | ospf_asbr_status_update (struct ospf *ospf, u_char status) |
718e3744 | 268 | { |
269 | zlog_info ("ASBR[Status:%d]: Update", status); | |
270 | ||
271 | /* ASBR on. */ | |
272 | if (status) | |
273 | { | |
274 | /* Already ASBR. */ | |
e84cc647 | 275 | if (IS_OSPF_ASBR (ospf)) |
718e3744 | 276 | { |
277 | zlog_info ("ASBR[Status:%d]: Already ASBR", status); | |
278 | return; | |
279 | } | |
e84cc647 | 280 | SET_FLAG (ospf->flags, OSPF_FLAG_ASBR); |
718e3744 | 281 | } |
282 | else | |
283 | { | |
284 | /* Already non ASBR. */ | |
e84cc647 | 285 | if (! IS_OSPF_ASBR (ospf)) |
718e3744 | 286 | { |
287 | zlog_info ("ASBR[Status:%d]: Already non ASBR", status); | |
288 | return; | |
289 | } | |
e84cc647 | 290 | UNSET_FLAG (ospf->flags, OSPF_FLAG_ASBR); |
718e3744 | 291 | } |
292 | ||
293 | /* Transition from/to status ASBR, schedule timer. */ | |
d3a9c768 | 294 | ospf_spf_calculate_schedule (ospf, SPF_FLAG_ASBR_STATUS_CHANGE); |
c363d386 | 295 | ospf_router_lsa_update (ospf); |
718e3744 | 296 | } |
297 | ||
298 | void | |
7c8ff89e | 299 | ospf_redistribute_withdraw (struct ospf *ospf, u_char type, u_short instance) |
718e3744 | 300 | { |
301 | struct route_node *rn; | |
302 | struct external_info *ei; | |
7c8ff89e DS |
303 | struct ospf_external *ext; |
304 | ||
305 | ext = ospf_external_lookup(type, instance); | |
306 | if (!ext) | |
307 | return; | |
718e3744 | 308 | |
309 | /* Delete external info for specified type. */ | |
7c8ff89e DS |
310 | if (EXTERNAL_INFO (ext)) |
311 | for (rn = route_top (EXTERNAL_INFO (ext)); rn; rn = route_next (rn)) | |
718e3744 | 312 | if ((ei = rn->info)) |
e84cc647 | 313 | if (ospf_external_info_find_lsa (ospf, &ei->p)) |
718e3744 | 314 | { |
315 | if (is_prefix_default (&ei->p) && | |
e84cc647 | 316 | ospf->default_originate != DEFAULT_ORIGINATE_NONE) |
718e3744 | 317 | continue; |
5339cfdb | 318 | ospf_external_lsa_flush (ospf, type, &ei->p, |
319 | ei->ifindex /*, ei->nexthop */); | |
fb01f87f SH |
320 | |
321 | ospf_external_info_free (ei); | |
322 | route_unlock_node (rn); | |
323 | rn->info = NULL; | |
718e3744 | 324 | } |
325 | } |