2 * Label Manager for FRR
4 * Copyright (C) 2017 by Bingen Eguzkitza,
7 * This file is part of FreeRangeRouting (FRR)
9 * FRR is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
14 * FRR is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; see the file COPYING; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
26 #include <sys/types.h>
31 #include "lib/memory.h"
33 #include "lib/network.h"
34 #include "lib/stream.h"
35 #include "lib/zclient.h"
36 #include "lib/libfrr.h"
38 #include "label_manager.h"
40 #define CONNECTION_DELAY 5
42 struct label_manager lbl_mgr
;
44 extern struct zebra_privs_t zserv_privs
;
46 DEFINE_MGROUP(LBL_MGR
, "Label Manager");
47 DEFINE_MTYPE_STATIC(LBL_MGR
, LM_CHUNK
, "Label Manager Chunk");
49 /* In case this zebra daemon is not acting as label manager,
50 * it will be a proxy to relay messages to external label manager
51 * This zclient thus is to connect to it
53 static struct stream
*obuf
;
54 static struct zclient
*zclient
;
57 static void delete_label_chunk(void *val
)
59 XFREE(MTYPE_LM_CHUNK
, val
);
62 static int relay_response_back(void)
65 struct stream
*src
, *dst
;
72 const char *proto_str
;
73 unsigned short instance
;
76 /* input buffer with msg from label manager */
82 ret
= zclient_read_header(src
, zclient
->sock
, &size
, &marker
, &version
,
84 if (ret
< 0 && errno
!= EAGAIN
) {
85 zlog_err("Error reading Label Manager response: %s",
89 zlog_debug("Label Manager response received, %d bytes", size
);
93 /* Get the 'proto' field of the message */
94 proto
= stream_getc(src
);
96 /* Get the 'instance' field of the message */
97 instance
= stream_getw(src
);
99 proto_str
= zebra_route_string(proto
);
101 /* lookup the client to relay the msg to */
102 zserv
= zebra_find_client(proto
, instance
);
105 "Error relaying LM response: can't find client %s, instance %u",
106 proto_str
, instance
);
109 zlog_debug("Found client to relay LM response to client %s instance %u",
110 proto_str
, instance
);
112 /* copy msg into output buffer */
114 stream_copy(dst
, src
);
116 /* send response back */
117 ret
= writen(zserv
->sock
, dst
->data
, stream_get_endp(dst
));
119 zlog_err("Error relaying LM response to %s instance %u: %s",
120 proto_str
, instance
, strerror(errno
));
123 zlog_debug("Relayed LM response (%d bytes) to %s instance %u", ret
,
124 proto_str
, instance
);
129 static int lm_zclient_read(struct thread
*t
)
133 zclient
->t_read
= NULL
;
135 /* read response and send it back */
136 ret
= relay_response_back();
141 static int reply_error(int cmd
, struct zserv
*zserv
, vrf_id_t vrf_id
)
146 s
= stream_new(ZEBRA_MAX_PACKET_SIZ
);
148 zclient_create_header(s
, cmd
, vrf_id
);
151 stream_putc(s
, zserv
->proto
);
153 stream_putw(s
, zserv
->instance
);
157 /* Write packet size. */
158 stream_putw_at(s
, 0, stream_get_endp(s
));
160 ret
= writen(zserv
->sock
, s
->data
, stream_get_endp(s
));
166 * Receive a request to get or release a label chunk and forward it to external
169 * It's called from zserv in case it's not an actual label manager, but just a
172 * @param cmd Type of request (connect, get or release)
174 * @return 0 on success, -1 otherwise
176 int zread_relay_label_manager_request(int cmd
, struct zserv
*zserv
,
177 struct stream
*msg
, vrf_id_t vrf_id
)
182 const char *proto_str
;
183 unsigned short instance
;
185 if (zclient
->sock
< 0) {
186 zlog_err("Unable to relay LM request: no socket");
187 reply_error(cmd
, zserv
, vrf_id
);
191 /* peek msg to get proto and instance id. This zebra, which acts as
192 * a proxy needs to have such values for each client in order to
193 * relay responses back to it.
196 /* Get the 'proto' field of incoming msg */
197 proto
= stream_getc(msg
);
199 /* Get the 'instance' field of incoming msg */
200 instance
= stream_getw(msg
);
202 /* stringify proto */
203 proto_str
= zebra_route_string(proto
);
205 /* check & set client proto if unset */
206 if (zserv
->proto
&& zserv
->proto
!= proto
) {
207 zlog_warn("Client proto(%u) != msg proto(%u)", zserv
->proto
,
212 /* check & set client instance if unset */
213 if (zserv
->instance
&& zserv
->instance
!= instance
) {
214 zlog_err("Client instance(%u) != msg instance(%u)",
215 zserv
->instance
, instance
);
219 /* recall proto and instance */
220 zserv
->instance
= instance
;
221 zserv
->proto
= proto
;
223 /* in case there's any incoming message enqueued, read and forward it */
225 ret
= relay_response_back();
227 /* get the msg buffer used toward the 'master' Label Manager */
230 /* copy the message */
231 stream_copy(dst
, msg
);
233 /* Send request to external label manager */
234 ret
= writen(zclient
->sock
, dst
->data
, stream_get_endp(dst
));
236 zlog_err("Error relaying LM request from %s instance %u: %s",
237 proto_str
, instance
, strerror(errno
));
238 reply_error(cmd
, zserv
, vrf_id
);
241 zlog_debug("Relayed LM request (%d bytes) from %s instance %u", ret
,
242 proto_str
, instance
);
245 /* Release label chunk has no response */
246 if (cmd
== ZEBRA_RELEASE_LABEL_CHUNK
)
249 /* make sure we listen to the response */
250 if (!zclient
->t_read
)
251 thread_add_read(zclient
->master
, lm_zclient_read
, NULL
,
252 zclient
->sock
, &zclient
->t_read
);
257 static int lm_zclient_connect(struct thread
*t
)
259 zclient
->t_connect
= NULL
;
261 if (zclient
->sock
>= 0)
264 if (zclient_socket_connect(zclient
) < 0) {
265 zlog_err("Error connecting synchronous zclient!");
266 thread_add_timer(zebrad
.master
, lm_zclient_connect
, zclient
,
267 CONNECTION_DELAY
, &zclient
->t_connect
);
271 /* make socket non-blocking */
272 if (set_nonblocking(zclient
->sock
) < 0)
273 zlog_warn("%s: set_nonblocking(%d) failed", __func__
,
280 * Function to initialize zclient in case this is not an actual
281 * label manager, but just a proxy to an external one.
283 * @param lm_zserv_path Path to zserv socket of external label manager
285 static void lm_zclient_init(char *lm_zserv_path
)
288 frr_zclient_addr(&zclient_addr
, &zclient_addr_len
,
291 /* Set default values. */
292 zclient
= zclient_new_notify(zebrad
.master
, &zclient_options_default
);
293 zclient
->privs
= &zserv_privs
;
295 zclient
->t_connect
= NULL
;
296 lm_zclient_connect(NULL
);
300 * Release label chunks from a client.
302 * Called on client disconnection or reconnection. It only releases chunks
303 * with empty keep value.
305 * @param proto Daemon protocol of client, to identify the owner
306 * @param instance Instance, to identify the owner
307 * @return Number of chunks released
309 int release_daemon_label_chunks(struct zserv
*client
)
311 uint8_t proto
= client
->proto
;
312 uint16_t instance
= client
->instance
;
313 struct listnode
*node
;
314 struct label_manager_chunk
*lmc
;
318 for (ALL_LIST_ELEMENTS_RO(lbl_mgr
.lc_list
, node
, lmc
)) {
319 if (lmc
->proto
== proto
&& lmc
->instance
== instance
321 ret
= release_label_chunk(lmc
->proto
, lmc
->instance
,
322 lmc
->start
, lmc
->end
);
328 zlog_debug("%s: Released %d label chunks", __func__
, count
);
334 * Init label manager (or proxy to an external one)
336 void label_manager_init(char *lm_zserv_path
)
338 /* this is an actual label manager */
339 if (!lm_zserv_path
) {
340 zlog_debug("Initializing internal label manager");
341 lm_is_external
= false;
342 lbl_mgr
.lc_list
= list_new();
343 lbl_mgr
.lc_list
->del
= delete_label_chunk
;
344 } else { /* it's acting just as a proxy */
345 zlog_debug("Initializing external label manager at %s",
347 lm_is_external
= true;
348 lm_zclient_init(lm_zserv_path
);
351 obuf
= stream_new(ZEBRA_MAX_PACKET_SIZ
);
353 hook_register(zserv_client_close
, release_daemon_label_chunks
);
357 * Core function, assigns label cunks
359 * It first searches through the list to check if there's one available
360 * (previously released). Otherwise it creates and assigns a new one
362 * @param proto Daemon protocol of client, to identify the owner
363 * @param instance Instance, to identify the owner
364 * @param keep If set, avoid garbage collection
365 * @para size Size of the label chunk
366 * @return Pointer to the assigned label chunk
368 struct label_manager_chunk
*assign_label_chunk(uint8_t proto
,
369 unsigned short instance
,
370 uint8_t keep
, uint32_t size
)
372 struct label_manager_chunk
*lmc
;
373 struct listnode
*node
;
375 /* first check if there's one available */
376 for (ALL_LIST_ELEMENTS_RO(lbl_mgr
.lc_list
, node
, lmc
)) {
377 if (lmc
->proto
== NO_PROTO
378 && lmc
->end
- lmc
->start
+ 1 == size
) {
380 lmc
->instance
= instance
;
385 /* otherwise create a new one */
386 lmc
= XCALLOC(MTYPE_LM_CHUNK
, sizeof(struct label_manager_chunk
));
390 if (list_isempty(lbl_mgr
.lc_list
))
391 lmc
->start
= MPLS_LABEL_UNRESERVED_MIN
;
393 lmc
->start
= ((struct label_manager_chunk
*)listgetdata(
394 listtail(lbl_mgr
.lc_list
)))
397 if (lmc
->start
> MPLS_LABEL_UNRESERVED_MAX
- size
+ 1) {
398 zlog_err("Reached max labels. Start: %u, size: %u", lmc
->start
,
400 XFREE(MTYPE_LM_CHUNK
, lmc
);
403 lmc
->end
= lmc
->start
+ size
- 1;
405 lmc
->instance
= instance
;
407 listnode_add(lbl_mgr
.lc_list
, lmc
);
413 * Core function, release no longer used label cunks
415 * @param proto Daemon protocol of client, to identify the owner
416 * @param instance Instance, to identify the owner
417 * @param start First label of the chunk
418 * @param end Last label of the chunk
419 * @return 0 on success, -1 otherwise
421 int release_label_chunk(uint8_t proto
, unsigned short instance
, uint32_t start
,
424 struct listnode
*node
;
425 struct label_manager_chunk
*lmc
;
428 /* check that size matches */
429 zlog_debug("Releasing label chunk: %u - %u", start
, end
);
430 /* find chunk and disown */
431 for (ALL_LIST_ELEMENTS_RO(lbl_mgr
.lc_list
, node
, lmc
)) {
432 if (lmc
->start
!= start
)
436 if (lmc
->proto
!= proto
|| lmc
->instance
!= instance
) {
437 zlog_err("%s: Daemon mismatch!!", __func__
);
440 lmc
->proto
= NO_PROTO
;
447 zlog_err("%s: Label chunk not released!!", __func__
);
453 void label_manager_close()
455 list_delete_and_null(&lbl_mgr
.lc_list
);