summaryrefslogtreecommitdiff
path: root/src/ipcpd/normal/pol/link_state.c
blob: 9dfed5c0e89e605031d8cd7b0e849bb05f5c4785 (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
/*
 * Ouroboros - Copyright (C) 2016 - 2017
 *
 * Link state routing policy
 *
 *    Dimitri Staessens <dimitri.staessens@ugent.be>
 *    Sander Vrijders   <sander.vrijders@ugent.be>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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; if not, write to the Free Software
 * Foundation, Inc., http://www.fsf.org/about/contact/.
 */

#define _POSIX_C_SOURCE 200112L

#define OUROBOROS_PREFIX "link-state-routing"

#include <ouroboros/errno.h>
#include <ouroboros/list.h>
#include <ouroboros/logs.h>
#include <ouroboros/rib.h>
#include <ouroboros/rqueue.h>

#include "ribmgr.h"
#include "ribconfig.h"
#include "graph.h"
#include "neighbors.h"
#include "ipcp.h"
#include "pff.h"

#include <assert.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <pthread.h>

#include "fso.pb-c.h"
typedef Fso fso_t;

#define BUF_SIZE 256
#define RECALC_TIME 4

struct routing_i {
        struct pff * pff;
        pthread_t    calculator;
};

struct {
        struct nbs *       nbs;
        struct nb_notifier nb_notifier;

        struct graph *     graph;

        ro_set_t *         set;
        rqueue_t *         queue;
        pthread_t          rib_listener;
} link_state;

/* Take under neighbors lock */
static int addr_to_fd(uint64_t addr)
{
        struct list_head * p = NULL;

        list_for_each(p, &link_state.nbs->list) {
                struct nb * e = list_entry(p, struct nb, next);
                if (e->conn.conn_info.addr == addr)
                        return e->conn.flow_info.fd;
        }

        return -1;
}

static void * calculate_pff(void * o)
{
        struct routing_i *      instance;
        struct routing_table ** table;
        ssize_t                 n_table;
        int                     i;
        int                     fd;

        instance = (struct routing_i *) o;

        while (true) {
                table = NULL;
                n_table = graph_routing_table(link_state.graph,
                                              ipcpi.dt_addr, &table);
                if (n_table < 0) {
                        sleep(RECALC_TIME);
                        continue;
                }

                pthread_mutex_lock(&link_state.nbs->list_lock);
                pff_lock(instance->pff);

                pff_flush(instance->pff);

                for (i = 0; i < n_table; i++) {
                        fd = addr_to_fd(table[i]->nhop);
                        if (fd == -1)
                                continue;

                        pff_add(instance->pff, table[i]->dst, fd);
                }

                pff_unlock(instance->pff);
                pthread_mutex_unlock(&link_state.nbs->list_lock);

                freepp(struct routing_table, table, n_table);
                sleep(RECALC_TIME);
        }

        return (void *) 0;
}

static int link_state_neighbor_event(enum nb_event event,
                                     struct conn   conn)
{
        char      path[RIB_MAX_PATH_LEN + 1];
        char      fso_name[RIB_MAX_PATH_LEN + 1];
        fso_t     fso = FSO__INIT;
        size_t    len;
        uint8_t * data;

        /* Only announce the flow if our address is bigger */
        if (ipcpi.dt_addr < conn.conn_info.addr)
                return 0;

        path[0] = '\0';
        sprintf(fso_name, "%" PRIu64 "-%" PRIu64,
                ipcpi.dt_addr, conn.conn_info.addr);
        rib_path_append(rib_path_append(path, ROUTING_NAME), fso_name);

        switch (event) {
        case NEIGHBOR_ADDED:
                fso.s_addr = ipcpi.dt_addr;
                fso.d_addr = conn.conn_info.addr;

                len = fso__get_packed_size(&fso);
                if (len == 0)
                        return -1;

                data = malloc(len);
                if (data == NULL)
                        return -1;

                fso__pack(&fso, data);

                if (rib_add(ROUTING_PATH, fso_name)) {
                        log_err("Failed to add FSO.");
                        free(data);
                        return -1;
                }

                if (rib_put(path, data, len)) {
                        log_err("Failed to put FSO in RIB.");
                        rib_del(path);
                        free(data);
                        return -1;
                }

                log_dbg("Added %s to RIB.", path);

                break;
        case NEIGHBOR_REMOVED:
                if (rib_del(path)) {
                        log_err("Failed to remove FSO.");
                        return -1;
                }

                log_dbg("Removed %s from RIB.", path);

                break;
        case NEIGHBOR_QOS_CHANGE:
                log_info("Not currently supported.");
                break;
        default:
                log_info("Unsupported event for routing.");
                break;
        }

        return 0;
}

static int read_fso(char *  path,
                    int32_t flag)
{
        ssize_t   len;
        uint8_t   ro[BUF_SIZE];
        fso_t *   fso;
        qosspec_t qs;

        memset(&qs, 0, sizeof(qs));

        len = rib_read(path, ro, BUF_SIZE);
        if (len < 0) {
                log_err("Failed to read FSO.");
                return -1;
        }

        fso = fso__unpack(NULL, len, ro);
        if (fso == NULL) {
                log_err("Failed to unpack.");
                return -1;
        }

        if (flag & RO_MODIFY) {
                if (graph_update_edge(link_state.graph,
                                      fso->s_addr, fso->d_addr, qs)) {
                        fso__free_unpacked(fso, NULL);
                        return -1;
                }
        } else if (flag & RO_DELETE) {
                if (graph_del_edge(link_state.graph, fso->s_addr, fso->d_addr)) {
                        fso__free_unpacked(fso, NULL);
                        return -1;
                }
        }

        fso__free_unpacked(fso, NULL);

        return 0;
}

static void * rib_listener(void * o)
{
        int32_t flag;
        char    path[RIB_MAX_PATH_LEN + 1];
        char ** children;
        ssize_t len;
        int     i;

        (void) o;

        if (ro_set_add(link_state.set, ROUTING_PATH, RO_MODIFY | RO_DELETE)) {
                log_err("Failed to add to RO set");
                return (void * ) -1;
        }

        len = rib_children(ROUTING_PATH, &children);
        if (len < 0) {
                log_err("Failed to retrieve children.");
                return (void *) -1;
        }

        for (i = 0; i < len; i++) {
                if (read_fso(children[i], RO_CREATE)) {
                        log_err("Failed to parse FSO.");
                        continue;
                }
        }

        while (rib_event_wait(link_state.set, link_state.queue, NULL) == 0) {
                path[0] = '\0';
                flag = rqueue_next(link_state.queue, path);
                if (flag < 0)
                        continue;

                if (read_fso(path, flag)) {
                        log_err("Failed to parse FSO.");
                        continue;
                }
        }

        return (void *) 0;
}

struct routing_i * link_state_routing_i_create(struct pff * pff)
{
        struct routing_i * tmp;

        assert(pff);

        tmp = malloc(sizeof(*tmp));
        if (tmp == NULL)
                return NULL;

        tmp->pff = pff;

        pthread_create(&tmp->calculator, NULL, calculate_pff, (void *) tmp);

        return tmp;
}

void link_state_routing_i_destroy(struct routing_i * instance)
{
        assert(instance);

        pthread_cancel(instance->calculator);

        pthread_join(instance->calculator, NULL);

        free(instance);
}

int link_state_init(struct nbs * nbs)
{
        link_state.graph = graph_create();
        if (link_state.graph == NULL)
                return -1;

        if (rib_add(RIB_ROOT, ROUTING_NAME)) {
                graph_destroy(link_state.graph);
                return -1;
        }

        link_state.nbs = nbs;

        link_state.nb_notifier.notify_call = link_state_neighbor_event;
        if (nbs_reg_notifier(link_state.nbs, &link_state.nb_notifier)) {
                graph_destroy(link_state.graph);
                rib_del(ROUTING_PATH);
                return -1;
        }

        link_state.set = ro_set_create();
        if (link_state.set == NULL) {
                nbs_unreg_notifier(link_state.nbs, &link_state.nb_notifier);
                graph_destroy(link_state.graph);
                rib_del(ROUTING_PATH);
                return -1;
        }

        link_state.queue = rqueue_create();
        if (link_state.queue == NULL) {
                ro_set_destroy(link_state.set);
                nbs_unreg_notifier(link_state.nbs, &link_state.nb_notifier);
                graph_destroy(link_state.graph);
                rib_del(ROUTING_PATH);
                return -1;
        }

        pthread_create(&link_state.rib_listener, NULL, rib_listener, NULL);

        return 0;
}

void link_state_fini(void)
{
        pthread_cancel(link_state.rib_listener);

        pthread_join(link_state.rib_listener, NULL);

        rqueue_destroy(link_state.queue);

        ro_set_destroy(link_state.set);

        graph_destroy(link_state.graph);

        rib_del(ROUTING_PATH);

        nbs_unreg_notifier(link_state.nbs, &link_state.nb_notifier);
}