summaryrefslogtreecommitdiffstats
path: root/isisd/isis_spf_private.h
blob: 131fa37991a92baa9594b260cf4290f31c39f3eb (plain)
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
352
353
354
355
356
357
358
359
360
361
362
/*
 * IS-IS Rout(e)ing protocol                  - isis_spf_private.h
 *
 * Copyright (C) 2001,2002   Sampo Saaristo
 *                           Tampere University of Technology
 *                           Institute of Communications Engineering
 * Copyright (C) 2017        Christian Franke <chris@opensourcerouting.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public Licenseas published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */
#ifndef ISIS_SPF_PRIVATE_H
#define ISIS_SPF_PRIVATE_H

#include "hash.h"
#include "jhash.h"
#include "skiplist.h"
#include "lib_errors.h"

enum vertextype {
	VTYPE_PSEUDO_IS = 1,
	VTYPE_PSEUDO_TE_IS,
	VTYPE_NONPSEUDO_IS,
	VTYPE_NONPSEUDO_TE_IS,
	VTYPE_ES,
	VTYPE_IPREACH_INTERNAL,
	VTYPE_IPREACH_EXTERNAL,
	VTYPE_IPREACH_TE,
	VTYPE_IP6REACH_INTERNAL,
	VTYPE_IP6REACH_EXTERNAL
};

#define VTYPE_IS(t) ((t) >= VTYPE_PSEUDO_IS && (t) <= VTYPE_NONPSEUDO_TE_IS)
#define VTYPE_ES(t) ((t) == VTYPE_ES)
#define VTYPE_IP(t) ((t) >= VTYPE_IPREACH_INTERNAL && (t) <= VTYPE_IP6REACH_EXTERNAL)

struct prefix_pair {
	struct prefix dest;
	struct prefix_ipv6 src;
};

/*
 * Triple <N, d(N), {Adj(N)}>
 */
struct isis_vertex {
	enum vertextype type;
	union {
		uint8_t id[ISIS_SYS_ID_LEN + 1];
		struct prefix_pair ip;
	} N;
	uint32_t d_N;	  /* d(N) Distance from this IS      */
	uint16_t depth;	/* The depth in the imaginary tree */
	struct list *Adj_N;    /* {Adj(N)} next hop or neighbor list */
	struct list *parents;  /* list of parents for ECMP */
	struct hash *firsthops; /* first two hops to neighbor */
	uint64_t insert_counter;
};

/* Vertex Queue and associated functions */

struct isis_vertex_queue {
	union {
		struct skiplist *slist;
		struct list *list;
	} l;
	struct hash *hash;
	uint64_t insert_counter;
};

__attribute__((__unused__))
static unsigned isis_vertex_queue_hash_key(void *vp)
{
	struct isis_vertex *vertex = vp;

	if (VTYPE_IP(vertex->type)) {
		uint32_t key;

		key = prefix_hash_key(&vertex->N.ip.dest);
		key = jhash_1word(prefix_hash_key(&vertex->N.ip.src), key);
		return key;
	}

	return jhash(vertex->N.id, ISIS_SYS_ID_LEN + 1, 0x55aa5a5a);
}

__attribute__((__unused__))
static int isis_vertex_queue_hash_cmp(const void *a, const void *b)
{
	const struct isis_vertex *va = a, *vb = b;

	if (va->type != vb->type)
		return 0;

	if (VTYPE_IP(va->type)) {
		if (prefix_cmp(&va->N.ip.dest, &vb->N.ip.dest))
			return 0;

		return prefix_cmp((const struct prefix *)&va->N.ip.src,
				  (const struct prefix *)&vb->N.ip.src) == 0;
	}

	return memcmp(va->N.id, vb->N.id, ISIS_SYS_ID_LEN + 1) == 0;
}

/*
 * Compares vertizes for sorting in the TENT list. Returns true
 * if candidate should be considered before current, false otherwise.
 */
__attribute__((__unused__))
static int isis_vertex_queue_tent_cmp(void *a, void *b)
{
	struct isis_vertex *va = a;
	struct isis_vertex *vb = b;

	if (va->d_N < vb->d_N)
		return -1;

	if (va->d_N > vb->d_N)
		return 1;

	if (va->type < vb->type)
		return -1;

	if (va->type > vb->type)
		return 1;

	if (va->insert_counter < vb->insert_counter)
		return -1;

	if (va->insert_counter > vb->insert_counter)
		return 1;

	return 0;
}

__attribute__((__unused__))
static struct skiplist *isis_vertex_queue_skiplist(void)
{
	return skiplist_new(0, isis_vertex_queue_tent_cmp, NULL);
}

__attribute__((__unused__))
static void isis_vertex_queue_init(struct isis_vertex_queue *queue,
				   const char *name, bool ordered)
{
	if (ordered) {
		queue->insert_counter = 1;
		queue->l.slist = isis_vertex_queue_skiplist();
	} else {
		queue->insert_counter = 0;
		queue->l.list = list_new();
	}
	queue->hash = hash_create(isis_vertex_queue_hash_key,
				  isis_vertex_queue_hash_cmp, name);
}

__attribute__((__unused__))
static void isis_vertex_del(struct isis_vertex *vertex)
{
	list_delete(&vertex->Adj_N);
	list_delete(&vertex->parents);
	if (vertex->firsthops) {
		hash_clean(vertex->firsthops, NULL);
		hash_free(vertex->firsthops);
		vertex->firsthops = NULL;
	}

	memset(vertex, 0, sizeof(struct isis_vertex));
	XFREE(MTYPE_ISIS_VERTEX, vertex);
}

__attribute__((__unused__))
static void isis_vertex_queue_clear(struct isis_vertex_queue *queue)
{
	hash_clean(queue->hash, NULL);

	if (queue->insert_counter) {
		struct isis_vertex *vertex;
		while (0 == skiplist_first(queue->l.slist, NULL,
					   (void **)&vertex)) {
			isis_vertex_del(vertex);
			skiplist_delete_first(queue->l.slist);
		}
		queue->insert_counter = 1;
	} else {
		queue->l.list->del = (void (*)(void *))isis_vertex_del;
		list_delete_all_node(queue->l.list);
		queue->l.list->del = NULL;
	}
}

__attribute__((__unused__))
static void isis_vertex_queue_free(struct isis_vertex_queue *queue)
{
	isis_vertex_queue_clear(queue);

	hash_free(queue->hash);
	queue->hash = NULL;

	if (queue->insert_counter) {
		skiplist_free(queue->l.slist);
		queue->l.slist = NULL;
	} else
		list_delete(&queue->l.list);
}

__attribute__((__unused__))
static unsigned int isis_vertex_queue_count(struct isis_vertex_queue *queue)
{
	return hashcount(queue->hash);
}

__attribute__((__unused__))
static void isis_vertex_queue_append(struct isis_vertex_queue *queue,
				     struct isis_vertex *vertex)
{
	assert(!queue->insert_counter);

	listnode_add(queue->l.list, vertex);

	struct isis_vertex *inserted;

	inserted = hash_get(queue->hash, vertex, hash_alloc_intern);
	assert(inserted == vertex);
}

__attribute__((__unused__))
static struct isis_vertex *isis_vertex_queue_last(struct isis_vertex_queue *queue)
{
	struct listnode *tail;

	assert(!queue->insert_counter);
	tail = listtail(queue->l.list);
	assert(tail);
	return listgetdata(tail);
}

__attribute__((__unused__))
static void isis_vertex_queue_insert(struct isis_vertex_queue *queue,
				     struct isis_vertex *vertex)
{
	assert(queue->insert_counter);
	vertex->insert_counter = queue->insert_counter++;
	assert(queue->insert_counter != (uint64_t)-1);

	skiplist_insert(queue->l.slist, vertex, vertex);

	struct isis_vertex *inserted;
	inserted = hash_get(queue->hash, vertex, hash_alloc_intern);
	assert(inserted == vertex);
}

__attribute__((__unused__))
static struct isis_vertex *
isis_vertex_queue_pop(struct isis_vertex_queue *queue)
{
	assert(queue->insert_counter);

	struct isis_vertex *rv;

	if (skiplist_first(queue->l.slist, NULL, (void **)&rv))
		return NULL;

	skiplist_delete_first(queue->l.slist);
	hash_release(queue->hash, rv);

	return rv;
}

__attribute__((__unused__))
static void isis_vertex_queue_delete(struct isis_vertex_queue *queue,
				     struct isis_vertex *vertex)
{
	assert(queue->insert_counter);

	skiplist_delete(queue->l.slist, vertex, vertex);
	hash_release(queue->hash, vertex);
}

#define ALL_QUEUE_ELEMENTS_RO(queue, node, data)                               \
	ALL_LIST_ELEMENTS_RO((queue)->l.list, node, data)

/* End of vertex queue definitions */

struct isis_spftree {
	struct isis_vertex_queue paths; /* the SPT */
	struct isis_vertex_queue tents; /* TENT */
	struct route_table *route_table;
	struct isis_area *area;    /* back pointer to area */
	unsigned int runcount;     /* number of runs since uptime */
	time_t last_run_timestamp; /* last run timestamp as wall time for display */
	time_t last_run_monotime;  /* last run as monotime for scheduling */
	time_t last_run_duration;  /* last run duration in msec */

	uint16_t mtid;
	int family;
	int level;
	enum spf_tree_id tree_id;
	bool hopcount_metric;
};

__attribute__((__unused__))
static void isis_vertex_id_init(struct isis_vertex *vertex, const void *id,
				enum vertextype vtype)
{
	vertex->type = vtype;

	if (VTYPE_IS(vtype) || VTYPE_ES(vtype)) {
		memcpy(vertex->N.id, id, ISIS_SYS_ID_LEN + 1);
	} else if (VTYPE_IP(vtype)) {
		memcpy(&vertex->N.ip, id, sizeof(vertex->N.ip));
	} else {
		flog_err(EC_LIB_DEVELOPMENT, "Unknown Vertex Type");
	}
}

__attribute__((__unused__))
static struct isis_vertex *isis_find_vertex(struct isis_vertex_queue *queue,
					    const void *id,
					    enum vertextype vtype)
{
	struct isis_vertex querier;

	isis_vertex_id_init(&querier, id, vtype);
	return hash_lookup(queue->hash, &querier);
}

__attribute__((__unused__))
static struct isis_lsp *lsp_for_vertex(struct isis_spftree *spftree,
				       struct isis_vertex *vertex)
{
	uint8_t lsp_id[ISIS_SYS_ID_LEN + 2];

	assert(VTYPE_IS(vertex->type));

	memcpy(lsp_id, vertex->N.id, ISIS_SYS_ID_LEN + 1);
	LSP_FRAGMENT(lsp_id) = 0;

	dict_t *lspdb = spftree->area->lspdb[spftree->level - 1];
	struct isis_lsp *lsp = lsp_search(lsp_id, lspdb);

	if (lsp && lsp->hdr.rem_lifetime != 0)
		return lsp;

	return NULL;
}

#define VID2STR_BUFFER SRCDEST2STR_BUFFER
const char *vid2string(struct isis_vertex *vertex, char *buff, int size);

#endif