1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
|
/* $OpenBSD: rde.h,v 1.58 2004/11/10 12:41:58 claudio Exp $ */
/*
* Copyright (c) 2003, 2004 Claudio Jeker <claudio@openbsd.org> and
* Andre Oppermann <oppermann@pipeline.ch>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __RDE_H__
#define __RDE_H__
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include "bgpd.h"
/* rde internal structures */
enum peer_state {
PEER_NONE,
PEER_DOWN,
PEER_UP,
PEER_ERR /* error occurred going to PEER_DOWN state */
};
/*
* How do we identify peers between the session handler and the rde?
* Currently I assume that we can do that with the neighbor_ip...
*/
LIST_HEAD(rde_peer_head, rde_peer);
LIST_HEAD(aspath_head, rde_aspath);
RB_HEAD(uptree_prefix, update_prefix);
RB_HEAD(uptree_attr, update_attr);
TAILQ_HEAD(uplist_prefix, update_prefix);
TAILQ_HEAD(uplist_attr, update_attr);
struct rde_peer {
LIST_ENTRY(rde_peer) hash_l; /* hash list over all peers */
LIST_ENTRY(rde_peer) peer_l; /* list of all peers */
struct aspath_head path_h; /* list of all as paths */
struct peer_config conf;
enum peer_state state;
u_int32_t prefix_cnt;
u_int32_t remote_bgpid;
struct bgpd_addr remote_addr;
struct bgpd_addr local_addr;
u_int32_t up_pcnt;
u_int32_t up_acnt;
u_int32_t up_nlricnt;
u_int32_t up_wcnt;
struct uptree_prefix up_prefix;
struct uptree_attr up_attrs;
struct uplist_attr updates;
struct uplist_prefix withdraws;
struct uplist_attr updates6;
struct uplist_prefix withdraws6;
};
#define AS_SET 1
#define AS_SEQUENCE 2
#define ASPATH_HEADER_SIZE (sizeof(struct aspath) - sizeof(u_char))
LIST_HEAD(aspath_list, aspath);
struct aspath {
LIST_ENTRY(aspath) entry;
int refcnt; /* reference count */
u_int16_t len; /* total length of aspath in octets */
u_int16_t ascnt; /* number of AS hops in data */
u_char data[1]; /* placeholder for actual data */
};
enum attrtypes {
ATTR_UNDEF,
ATTR_ORIGIN,
ATTR_ASPATH,
ATTR_NEXTHOP,
ATTR_MED,
ATTR_LOCALPREF,
ATTR_ATOMIC_AGGREGATE,
ATTR_AGGREGATOR,
ATTR_COMMUNITIES,
ATTR_ORIGINATOR_ID,
ATTR_CLUSTER_LIST,
ATTR_MP_REACH_NLRI=14,
ATTR_MP_UNREACH_NLRI=15
};
/* attribute flags. 4 low order bits reserved */
#define ATTR_EXTLEN 0x10
#define ATTR_PARTIAL 0x20
#define ATTR_TRANSITIVE 0x40
#define ATTR_OPTIONAL 0x80
/* default attribute flags for well known attributes */
#define ATTR_WELL_KNOWN ATTR_TRANSITIVE
struct attr {
TAILQ_ENTRY(attr) entry;
u_int8_t flags;
u_int8_t type;
u_int16_t len;
u_char *data;
};
struct mpattr {
void *reach;
u_int16_t reach_len;
void *unreach;
u_int16_t unreach_len;
};
TAILQ_HEAD(attr_list, attr);
struct path_table {
struct aspath_head *path_hashtbl;
u_int32_t path_hashmask;
};
LIST_HEAD(prefix_head, prefix);
#define F_ATTR_ORIGIN 0x001
#define F_ATTR_ASPATH 0x002
#define F_ATTR_NEXTHOP 0x004
#define F_ATTR_LOCALPREF 0x008
#define F_ATTR_MED 0x010
#define F_ATTR_MED_ANNOUNCE 0x020
#define F_ATTR_MP_REACH 0x040
#define F_ATTR_MP_UNREACH 0x080
#define F_PREFIX_ANNOUNCED 0x100
#define F_NEXTHOP_REJECT 0x200
#define F_NEXTHOP_BLACKHOLE 0x400
#define F_ATTR_LINKED 0x800
#define ORIGIN_IGP 0
#define ORIGIN_EGP 1
#define ORIGIN_INCOMPLETE 2
#define DEFAULT_LPREF 100
struct rde_aspath {
LIST_ENTRY(rde_aspath) path_l, peer_l, nexthop_l;
struct prefix_head prefix_h;
struct rde_peer *peer;
/* path attributes */
struct aspath *aspath;
struct nexthop *nexthop; /* may be NULL */
struct attr_list others;
u_int32_t med; /* multi exit disc */
u_int32_t lpref; /* local pref */
u_int8_t origin;
u_int16_t flags; /* internally used */
u_int16_t prefix_cnt; /* # of prefixes */
u_int16_t active_cnt; /* # of active prefixes */
char pftable[PFTABLE_LEN];
};
enum nexthop_state {
NEXTHOP_LOOKUP,
NEXTHOP_UNREACH,
NEXTHOP_REACH
};
struct nexthop {
LIST_ENTRY(nexthop) nexthop_l;
struct aspath_head path_h;
#if 0
/*
* currently we use the boolean nexthop state, this could be exchanged
* with a variable cost with a max for unreachable.
*/
u_int32_t costs;
#endif
enum nexthop_state state;
struct bgpd_addr exit_nexthop;
struct bgpd_addr true_nexthop;
struct bgpd_addr nexthop_net;
u_int8_t nexthop_netlen;
u_int8_t flags;
#define NEXTHOP_CONNECTED 0x01
};
/* generic entry without address specific part */
struct pt_entry {
RB_ENTRY(pt_entry) pt_e;
sa_family_t af;
u_int8_t prefixlen;
struct prefix_head prefix_h;
struct prefix *active; /* for fast access */
};
struct pt_entry4 {
RB_ENTRY(pt_entry) pt_e;
sa_family_t af;
u_int8_t prefixlen;
struct prefix_head prefix_h;
struct prefix *active; /* for fast access */
struct in_addr prefix4;
/*
* Route Flap Damping structures
* Currently I think they belong into the prefix but for the moment
* we just ignore the dampening at all.
*/
};
struct pt_entry6 {
RB_ENTRY(pt_entry) pt_e;
sa_family_t af;
u_int8_t prefixlen;
struct prefix_head prefix_h;
struct prefix *active; /* for fast access */
struct in6_addr prefix6;
};
struct prefix {
LIST_ENTRY(prefix) prefix_l, path_l;
struct rde_aspath *aspath;
struct pt_entry *prefix;
struct rde_peer *peer;
time_t lastchange;
};
/* prototypes */
/* rde.c */
void rde_send_kroute(struct prefix *, struct prefix *);
void rde_send_nexthop(struct bgpd_addr *, int);
void rde_send_pftable(const char *, struct bgpd_addr *,
u_int8_t, int);
void rde_send_pftable_commit(void);
void rde_generate_updates(struct prefix *, struct prefix *);
u_int16_t rde_local_as(void);
int rde_noevaluate(void);
/* rde_attr.c */
int attr_write(void *, u_int16_t, u_int8_t, u_int8_t, void *,
u_int16_t);
void attr_optcopy(struct rde_aspath *, struct rde_aspath *);
int attr_optadd(struct rde_aspath *, u_int8_t, u_int8_t,
void *, u_int16_t);
struct attr *attr_optget(const struct rde_aspath *, u_int8_t);
void attr_optfree(struct rde_aspath *);
int attr_mp_nexthop(u_char *, u_int16_t, u_int16_t,
struct rde_aspath *);
int aspath_verify(void *, u_int16_t);
#define AS_ERR_LEN -1
#define AS_ERR_TYPE -2
#define AS_ERR_BAD -3
void aspath_init(u_int32_t);
void aspath_shutdown(void);
struct aspath *aspath_get(void *, u_int16_t);
void aspath_put(struct aspath *);
u_char *aspath_dump(struct aspath *);
u_int16_t aspath_length(struct aspath *);
u_int16_t aspath_count(const void *, u_int16_t);
u_int16_t aspath_neighbor(struct aspath *);
int aspath_loopfree(struct aspath *, u_int16_t);
int aspath_compare(struct aspath *, struct aspath *);
u_int32_t aspath_hash(const void *, u_int16_t);
struct aspath *aspath_prepend(struct aspath *, u_int16_t, int);
int aspath_snprint(char *, size_t, void *, u_int16_t);
int aspath_asprint(char **, void *, u_int16_t);
size_t aspath_strlen(void *, u_int16_t);
int aspath_match(struct aspath *, enum as_spec, u_int16_t);
int community_match(void *, u_int16_t, int, int);
int community_set(struct attr *, int, int);
/* rde_rib.c */
void path_init(u_int32_t);
void path_shutdown(void);
void path_update(struct rde_peer *, struct rde_aspath *,
struct bgpd_addr *, int);
int path_compare(struct rde_aspath *, struct rde_aspath *);
struct rde_aspath *path_lookup(struct rde_aspath *, struct rde_peer *);
void path_remove(struct rde_aspath *);
void path_updateall(struct rde_aspath *, enum nexthop_state);
void path_destroy(struct rde_aspath *);
int path_empty(struct rde_aspath *);
struct rde_aspath *path_copy(struct rde_aspath *);
struct rde_aspath *path_get(void);
void path_put(struct rde_aspath *);
#define PREFIX_SIZE(x) (((x) + 7) / 8 + 1)
int prefix_compare(const struct bgpd_addr *,
const struct bgpd_addr *, int);
struct prefix *prefix_get(struct rde_peer *, struct bgpd_addr *, int);
struct pt_entry *prefix_add(struct rde_aspath *, struct bgpd_addr *, int);
struct pt_entry *prefix_move(struct rde_aspath *, struct prefix *);
void prefix_remove(struct rde_peer *, struct bgpd_addr *, int);
int prefix_write(u_char *, int, struct bgpd_addr *, u_int8_t);
struct prefix *prefix_bypeer(struct pt_entry *, struct rde_peer *);
void prefix_updateall(struct rde_aspath *, enum nexthop_state);
void prefix_destroy(struct prefix *);
void prefix_network_clean(struct rde_peer *, time_t);
void nexthop_init(u_int32_t);
void nexthop_shutdown(void);
void nexthop_modify(struct rde_aspath *, struct bgpd_addr *, int,
sa_family_t);
void nexthop_link(struct rde_aspath *);
void nexthop_unlink(struct rde_aspath *);
void nexthop_update(struct kroute_nexthop *);
struct nexthop *nexthop_get(struct bgpd_addr *);
int nexthop_compare(struct nexthop *, struct nexthop *);
/* rde_decide.c */
void prefix_evaluate(struct prefix *, struct pt_entry *);
void up_init(struct rde_peer *);
void up_down(struct rde_peer *);
void up_generate_updates(struct rde_peer *,
struct prefix *, struct prefix *);
void up_generate_default(struct rde_peer *, sa_family_t);
int up_dump_prefix(u_char *, int, struct uplist_prefix *,
struct rde_peer *);
int up_dump_attrnlri(u_char *, int, struct rde_peer *);
void up_dump_upcall(struct pt_entry *, void *);
/* rde_prefix.c */
void pt_init(void);
void pt_shutdown(void);
int pt_empty(struct pt_entry *);
void pt_getaddr(struct pt_entry *, struct bgpd_addr *);
struct pt_entry *pt_get(struct bgpd_addr *, int);
struct pt_entry *pt_add(struct bgpd_addr *, int);
void pt_remove(struct pt_entry *);
struct pt_entry *pt_lookup(struct bgpd_addr *);
void pt_dump(void (*)(struct pt_entry *, void *), void *,
sa_family_t);
/* rde_filter.c */
enum filter_actions rde_filter(struct rde_peer *, struct rde_aspath *,
struct bgpd_addr *, u_int8_t, enum directions);
void rde_apply_set(struct rde_aspath *, struct filter_set *,
sa_family_t, struct rde_peer *, enum directions);
int rde_filter_community(struct rde_aspath *, int, int);
#endif /* __RDE_H__ */
|
