4 * Copyright (C) 1997-1999 Kunihiro Ishiguro
5 * Copyright (C) 2015-2018 Cumulus Networks, Inc.
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
18 * You should have received a copy of the GNU General Public License along
19 * with this program; see the file COPYING; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 /* clang-format off */
26 #include <errno.h> /* for errno */
27 #include <netinet/in.h> /* for sockaddr_in */
28 #include <stdint.h> /* for uint8_t */
29 #include <stdio.h> /* for snprintf */
30 #include <sys/socket.h> /* for sockaddr_storage, AF_UNIX, accept... */
31 #include <sys/stat.h> /* for umask, mode_t */
32 #include <sys/un.h> /* for sockaddr_un */
33 #include <time.h> /* for NULL, tm, gmtime, time_t */
34 #include <unistd.h> /* for close, unlink, ssize_t */
36 #include "lib/buffer.h" /* for BUFFER_EMPTY, BUFFER_ERROR, BUFFE... */
37 #include "lib/command.h" /* for vty, install_element, CMD_SUCCESS... */
38 #include "lib/hook.h" /* for DEFINE_HOOK, DEFINE_KOOH, hook_call */
39 #include "lib/linklist.h" /* for ALL_LIST_ELEMENTS_RO, ALL_LIST_EL... */
40 #include "lib/libfrr.h" /* for frr_zclient_addr */
41 #include "lib/log.h" /* for zlog_warn, zlog_debug, safe_strerror */
42 #include "lib/memory.h" /* for MTYPE_TMP, XCALLOC, XFREE */
43 #include "lib/monotime.h" /* for monotime, ONE_DAY_SECOND, ONE_WEE... */
44 #include "lib/network.h" /* for set_nonblocking */
45 #include "lib/privs.h" /* for zebra_privs_t, ZPRIVS_LOWER, ZPRI... */
46 #include "lib/route_types.h" /* for ZEBRA_ROUTE_MAX */
47 #include "lib/sockopt.h" /* for setsockopt_so_recvbuf, setsockopt... */
48 #include "lib/sockunion.h" /* for sockopt_reuseaddr, sockopt_reuseport */
49 #include "lib/stream.h" /* for STREAM_SIZE, stream (ptr only), ... */
50 #include "lib/thread.h" /* for thread (ptr only), THREAD_ARG, ... */
51 #include "lib/vrf.h" /* for vrf_info_lookup, VRF_DEFAULT */
52 #include "lib/vty.h" /* for vty_out, vty (ptr only) */
53 #include "lib/zclient.h" /* for zmsghdr, ZEBRA_HEADER_SIZE, ZEBRA... */
54 #include "lib/frr_pthread.h" /* for frr_pthread_new, frr_pthread_stop... */
55 #include "lib/frratomic.h" /* for atomic_load_explicit, atomic_stor... */
56 #include "lib/lib_errors.h" /* for generic ferr ids */
57 #include "lib/printfrr.h" /* for string functions */
59 #include "zebra/debug.h" /* for various debugging macros */
60 #include "zebra/rib.h" /* for rib_score_proto */
61 #include "zebra/zapi_msg.h" /* for zserv_handle_commands */
62 #include "zebra/zebra_vrf.h" /* for zebra_vrf_lookup_by_id, zvrf */
63 #include "zebra/zserv.h" /* for zserv */
64 #include "zebra/zebra_router.h"
65 #include "zebra/zebra_errors.h" /* for error messages */
69 extern struct zebra_privs_t zserv_privs
;
71 /* The listener socket for clients connecting to us */
74 /* The lock that protects access to zapi client objects */
75 static pthread_mutex_t client_mutex
;
77 static struct zserv
*find_client_internal(uint8_t proto
,
78 unsigned short instance
,
83 * Client thread events.
85 * These are used almost exclusively by client threads to drive their own event
86 * loops. The only exception is in zserv_client_create(), which pushes an
87 * initial ZSERV_CLIENT_READ event to start the API handler loop.
89 enum zserv_client_event
{
90 /* Schedule a socket read */
92 /* Schedule a buffer write */
99 * These are used by client threads to notify the main thread about various
100 * events and to make processing requests.
103 /* Schedule listen job on Zebra API socket */
105 /* The calling client has packets on its input buffer */
106 ZSERV_PROCESS_MESSAGES
,
107 /* The calling client wishes to be killed */
108 ZSERV_HANDLE_CLIENT_FAIL
,
112 * Zebra server event driver for all client threads.
114 * This is essentially a wrapper around thread_add_event() that centralizes
115 * those scheduling calls into one place.
117 * All calls to this function schedule an event on the pthread running the
121 * the client in question, and thread target
124 * the event to notify them about
126 static void zserv_client_event(struct zserv
*client
,
127 enum zserv_client_event event
);
130 * Zebra server event driver for the main thread.
132 * This is essentially a wrapper around thread_add_event() that centralizes
133 * those scheduling calls into one place.
135 * All calls to this function schedule an event on Zebra's main pthread.
138 * the client in question
141 * the event to notify the main thread about
143 static void zserv_event(struct zserv
*client
, enum zserv_event event
);
146 /* Client thread lifecycle -------------------------------------------------- */
149 * Log zapi message to zlog.
160 void zserv_log_message(const char *errmsg
, struct stream
*msg
,
163 zlog_debug("Rx'd ZAPI message");
165 zlog_debug("%s", errmsg
);
167 zlog_debug(" Length: %d", hdr
->length
);
168 zlog_debug("Command: %s", zserv_command_string(hdr
->command
));
169 zlog_debug(" VRF: %u", hdr
->vrf_id
);
175 * Gracefuly shut down a client connection.
177 * Cancel any pending tasks for the client's thread. Then schedule a task on
178 * the main thread to shut down the calling thread.
180 * It is not safe to close the client socket in this function. The socket is
181 * owned by the main thread.
183 * Must be called from the client pthread, never the main thread.
185 static void zserv_client_fail(struct zserv
*client
)
187 flog_warn(EC_ZEBRA_CLIENT_IO_ERROR
,
188 "Client '%s' encountered an error and is shutting down.",
189 zebra_route_string(client
->proto
));
191 atomic_store_explicit(&client
->pthread
->running
, false,
192 memory_order_relaxed
);
194 THREAD_OFF(client
->t_read
);
195 THREAD_OFF(client
->t_write
);
196 zserv_event(client
, ZSERV_HANDLE_CLIENT_FAIL
);
200 * Write all pending messages to client socket.
202 * This function first attempts to flush any buffered data. If unsuccessful,
203 * the function reschedules itself and returns. If successful, it pops all
204 * available messages from the output queue and continues to write data
205 * directly to the socket until the socket would block. If the socket never
206 * blocks and all data is written, the function returns without rescheduling
207 * itself. If the socket ends up throwing EWOULDBLOCK, the remaining data is
208 * buffered and the function reschedules itself.
210 * The utility of the buffer is that it allows us to vastly reduce lock
211 * contention by allowing us to pop *all* messages off the output queue at once
212 * instead of locking and unlocking each time we want to pop a single message
213 * off the queue. The same thing could arguably be accomplished faster by
214 * allowing the main thread to write directly into the buffer instead of
215 * enqueuing packets onto an intermediary queue, but the intermediary queue
216 * allows us to expose information about input and output queues to the user in
217 * terms of number of packets rather than size of data.
219 static void zserv_write(struct thread
*thread
)
221 struct zserv
*client
= THREAD_ARG(thread
);
224 struct stream_fifo
*cache
;
226 /* If we have any data pending, try to flush it first */
227 switch (buffer_flush_all(client
->wb
, client
->sock
)) {
231 atomic_store_explicit(&client
->last_write_time
,
232 (uint32_t)monotime(NULL
),
233 memory_order_relaxed
);
234 zserv_client_event(client
, ZSERV_CLIENT_WRITE
);
240 cache
= stream_fifo_new();
242 frr_with_mutex (&client
->obuf_mtx
) {
243 while (stream_fifo_head(client
->obuf_fifo
))
244 stream_fifo_push(cache
,
245 stream_fifo_pop(client
->obuf_fifo
));
250 stream_set_getp(msg
, 0);
251 wcmd
= stream_getw_from(msg
, ZAPI_HEADER_CMD_LOCATION
);
254 while (stream_fifo_head(cache
)) {
255 msg
= stream_fifo_pop(cache
);
256 buffer_put(client
->wb
, STREAM_DATA(msg
), stream_get_endp(msg
));
260 stream_fifo_free(cache
);
262 /* If we have any data pending, try to flush it first */
263 switch (buffer_flush_all(client
->wb
, client
->sock
)) {
267 atomic_store_explicit(&client
->last_write_time
,
268 (uint32_t)monotime(NULL
),
269 memory_order_relaxed
);
270 zserv_client_event(client
, ZSERV_CLIENT_WRITE
);
276 atomic_store_explicit(&client
->last_write_cmd
, wcmd
,
277 memory_order_relaxed
);
279 atomic_store_explicit(&client
->last_write_time
,
280 (uint32_t)monotime(NULL
), memory_order_relaxed
);
285 flog_warn(EC_ZEBRA_CLIENT_WRITE_FAILED
,
286 "%s: could not write to %s [fd = %d], closing.", __func__
,
287 zebra_route_string(client
->proto
), client
->sock
);
288 zserv_client_fail(client
);
292 * Read and process data from a client socket.
294 * The responsibilities here are to read raw data from the client socket,
295 * validate the header, encapsulate it into a single stream object, push it
296 * onto the input queue and then notify the main thread that there is new data
299 * This function first looks for any data in the client structure's working
300 * input buffer. If data is present, it is assumed that reading stopped in a
301 * previous invocation of this task and needs to be resumed to finish a message.
302 * Otherwise, the socket data stream is assumed to be at the beginning of a new
303 * ZAPI message (specifically at the header). The header is read and validated.
304 * If the header passed validation then the length field found in the header is
305 * used to compute the total length of the message. That much data is read (but
306 * not inspected), appended to the header, placed into a stream and pushed onto
307 * the client's input queue. A task is then scheduled on the main thread to
308 * process the client's input queue. Finally, if all of this was successful,
309 * this task reschedules itself.
311 * Any failure in any of these actions is handled by terminating the client.
313 static void zserv_read(struct thread
*thread
)
315 struct zserv
*client
= THREAD_ARG(thread
);
318 struct stream_fifo
*cache
;
324 p2p_orig
= atomic_load_explicit(&zrouter
.packets_to_process
,
325 memory_order_relaxed
);
326 cache
= stream_fifo_new();
328 sock
= THREAD_FD(thread
);
335 already
= stream_get_endp(client
->ibuf_work
);
337 /* Read length and command (if we don't have it already). */
338 if (already
< ZEBRA_HEADER_SIZE
) {
339 nb
= stream_read_try(client
->ibuf_work
, sock
,
340 ZEBRA_HEADER_SIZE
- already
);
341 if ((nb
== 0 || nb
== -1)) {
342 if (IS_ZEBRA_DEBUG_EVENT
)
343 zlog_debug("connection closed socket [%d]",
347 if (nb
!= (ssize_t
)(ZEBRA_HEADER_SIZE
- already
)) {
348 /* Try again later. */
351 already
= ZEBRA_HEADER_SIZE
;
354 /* Reset to read from the beginning of the incoming packet. */
355 stream_set_getp(client
->ibuf_work
, 0);
357 /* Fetch header values */
358 hdrvalid
= zapi_parse_header(client
->ibuf_work
, &hdr
);
361 snprintf(errmsg
, sizeof(errmsg
),
362 "%s: Message has corrupt header", __func__
);
363 zserv_log_message(errmsg
, client
->ibuf_work
, NULL
);
367 /* Validate header */
368 if (hdr
.marker
!= ZEBRA_HEADER_MARKER
369 || hdr
.version
!= ZSERV_VERSION
) {
371 errmsg
, sizeof(errmsg
),
372 "Message has corrupt header\n%s: socket %d version mismatch, marker %d, version %d",
373 __func__
, sock
, hdr
.marker
, hdr
.version
);
374 zserv_log_message(errmsg
, client
->ibuf_work
, &hdr
);
377 if (hdr
.length
< ZEBRA_HEADER_SIZE
) {
379 errmsg
, sizeof(errmsg
),
380 "Message has corrupt header\n%s: socket %d message length %u is less than header size %d",
381 __func__
, sock
, hdr
.length
, ZEBRA_HEADER_SIZE
);
382 zserv_log_message(errmsg
, client
->ibuf_work
, &hdr
);
385 if (hdr
.length
> STREAM_SIZE(client
->ibuf_work
)) {
387 errmsg
, sizeof(errmsg
),
388 "Message has corrupt header\n%s: socket %d message length %u exceeds buffer size %lu",
389 __func__
, sock
, hdr
.length
,
390 (unsigned long)STREAM_SIZE(client
->ibuf_work
));
391 zserv_log_message(errmsg
, client
->ibuf_work
, &hdr
);
395 /* Read rest of data. */
396 if (already
< hdr
.length
) {
397 nb
= stream_read_try(client
->ibuf_work
, sock
,
398 hdr
.length
- already
);
399 if ((nb
== 0 || nb
== -1)) {
400 if (IS_ZEBRA_DEBUG_EVENT
)
402 "connection closed [%d] when reading zebra data",
406 if (nb
!= (ssize_t
)(hdr
.length
- already
)) {
407 /* Try again later. */
412 /* Debug packet information. */
413 if (IS_ZEBRA_DEBUG_PACKET
)
414 zlog_debug("zebra message[%s:%u:%u] comes from socket [%d]",
415 zserv_command_string(hdr
.command
),
416 hdr
.vrf_id
, hdr
.length
,
419 stream_set_getp(client
->ibuf_work
, 0);
420 struct stream
*msg
= stream_dup(client
->ibuf_work
);
422 stream_fifo_push(cache
, msg
);
423 stream_reset(client
->ibuf_work
);
427 if (p2p
< p2p_orig
) {
428 /* update session statistics */
429 atomic_store_explicit(&client
->last_read_time
, monotime(NULL
),
430 memory_order_relaxed
);
431 atomic_store_explicit(&client
->last_read_cmd
, hdr
.command
,
432 memory_order_relaxed
);
434 /* publish read packets on client's input queue */
435 frr_with_mutex (&client
->ibuf_mtx
) {
437 stream_fifo_push(client
->ibuf_fifo
,
438 stream_fifo_pop(cache
));
441 /* Schedule job to process those packets */
442 zserv_event(client
, ZSERV_PROCESS_MESSAGES
);
446 if (IS_ZEBRA_DEBUG_PACKET
)
447 zlog_debug("Read %d packets from client: %s", p2p_orig
- p2p
,
448 zebra_route_string(client
->proto
));
450 /* Reschedule ourselves */
451 zserv_client_event(client
, ZSERV_CLIENT_READ
);
453 stream_fifo_free(cache
);
458 stream_fifo_free(cache
);
459 zserv_client_fail(client
);
462 static void zserv_client_event(struct zserv
*client
,
463 enum zserv_client_event event
)
466 case ZSERV_CLIENT_READ
:
467 thread_add_read(client
->pthread
->master
, zserv_read
, client
,
468 client
->sock
, &client
->t_read
);
470 case ZSERV_CLIENT_WRITE
:
471 thread_add_write(client
->pthread
->master
, zserv_write
, client
,
472 client
->sock
, &client
->t_write
);
477 /* Main thread lifecycle ---------------------------------------------------- */
480 * Read and process messages from a client.
482 * This task runs on the main pthread. It is scheduled by client pthreads when
483 * they have new messages available on their input queues. The client is passed
484 * as the task argument.
486 * Each message is popped off the client's input queue and the action associated
487 * with the message is executed. This proceeds until there are no more messages,
488 * an error occurs, or the processing limit is reached.
490 * The client's I/O thread can push at most zrouter.packets_to_process messages
491 * onto the input buffer before notifying us there are packets to read. As long
492 * as we always process zrouter.packets_to_process messages here, then we can
493 * rely on the read thread to handle queuing this task enough times to process
494 * everything on the input queue.
496 static void zserv_process_messages(struct thread
*thread
)
498 struct zserv
*client
= THREAD_ARG(thread
);
500 struct stream_fifo
*cache
= stream_fifo_new();
501 uint32_t p2p
= zrouter
.packets_to_process
;
502 bool need_resched
= false;
504 frr_with_mutex (&client
->ibuf_mtx
) {
506 for (i
= 0; i
< p2p
&& stream_fifo_head(client
->ibuf_fifo
);
508 msg
= stream_fifo_pop(client
->ibuf_fifo
);
509 stream_fifo_push(cache
, msg
);
514 /* Need to reschedule processing work if there are still
515 * packets in the fifo.
517 if (stream_fifo_head(client
->ibuf_fifo
))
521 /* Process the batch of messages */
522 if (stream_fifo_head(cache
))
523 zserv_handle_commands(client
, cache
);
525 stream_fifo_free(cache
);
527 /* Reschedule ourselves if necessary */
529 zserv_event(client
, ZSERV_PROCESS_MESSAGES
);
532 int zserv_send_message(struct zserv
*client
, struct stream
*msg
)
534 frr_with_mutex (&client
->obuf_mtx
) {
535 stream_fifo_push(client
->obuf_fifo
, msg
);
538 zserv_client_event(client
, ZSERV_CLIENT_WRITE
);
544 * Send a batch of messages to a connected Zebra API client.
546 int zserv_send_batch(struct zserv
*client
, struct stream_fifo
*fifo
)
550 frr_with_mutex (&client
->obuf_mtx
) {
551 msg
= stream_fifo_pop(fifo
);
553 stream_fifo_push(client
->obuf_fifo
, msg
);
554 msg
= stream_fifo_pop(fifo
);
558 zserv_client_event(client
, ZSERV_CLIENT_WRITE
);
563 /* Hooks for client connect / disconnect */
564 DEFINE_HOOK(zserv_client_connect
, (struct zserv
*client
), (client
));
565 DEFINE_KOOH(zserv_client_close
, (struct zserv
*client
), (client
));
568 * Deinitialize zebra client.
570 * - Deregister and deinitialize related internal resources
571 * - Gracefuly close socket
572 * - Free associated resources
573 * - Free client structure
575 * This does *not* take any action on the struct thread * fields. These are
576 * managed by the owning pthread and any tasks associated with them must have
577 * been stopped prior to invoking this function.
579 static void zserv_client_free(struct zserv
*client
)
584 hook_call(zserv_client_close
, client
);
586 /* Close file descriptor. */
588 unsigned long nroutes
;
593 if (DYNAMIC_CLIENT_GR_DISABLED(client
)) {
594 zebra_mpls_client_cleanup_vrf_label(client
->proto
);
596 nroutes
= rib_score_proto(client
->proto
,
599 "client %d disconnected %lu %s routes removed from the rib",
600 client
->sock
, nroutes
,
601 zebra_route_string(client
->proto
));
603 /* Not worrying about instance for now */
604 nnhgs
= zebra_nhg_score_proto(client
->proto
);
606 "client %d disconnected %lu %s nhgs removed from the rib",
608 zebra_route_string(client
->proto
));
613 /* Free stream buffers. */
614 if (client
->ibuf_work
)
615 stream_free(client
->ibuf_work
);
616 if (client
->obuf_work
)
617 stream_free(client
->obuf_work
);
618 if (client
->ibuf_fifo
)
619 stream_fifo_free(client
->ibuf_fifo
);
620 if (client
->obuf_fifo
)
621 stream_fifo_free(client
->obuf_fifo
);
623 buffer_free(client
->wb
);
625 /* Free buffer mutexes */
626 pthread_mutex_destroy(&client
->obuf_mtx
);
627 pthread_mutex_destroy(&client
->ibuf_mtx
);
630 for (afi_t afi
= AFI_IP
; afi
< AFI_MAX
; afi
++) {
631 for (int i
= 0; i
< ZEBRA_ROUTE_MAX
; i
++) {
632 vrf_bitmap_free(client
->redist
[afi
][i
]);
633 redist_del_all_instances(&client
->mi_redist
[afi
][i
]);
636 vrf_bitmap_free(client
->redist_default
[afi
]);
637 vrf_bitmap_free(client
->ridinfo
[afi
]);
638 vrf_bitmap_free(client
->nhrp_neighinfo
[afi
]);
642 * If any instance are graceful restart enabled,
643 * client is not deleted
645 if (DYNAMIC_CLIENT_GR_DISABLED(client
)) {
646 if (IS_ZEBRA_DEBUG_EVENT
)
647 zlog_debug("%s: Deleting client %s", __func__
,
648 zebra_route_string(client
->proto
));
649 XFREE(MTYPE_TMP
, client
);
651 /* Handle cases where client has GR instance. */
652 if (IS_ZEBRA_DEBUG_EVENT
)
653 zlog_debug("%s: client %s restart enabled", __func__
,
654 zebra_route_string(client
->proto
));
655 if (zebra_gr_client_disconnect(client
) < 0)
657 "%s: GR enabled but could not handle disconnect event",
662 void zserv_close_client(struct zserv
*client
)
666 if (client
->pthread
) {
667 /* synchronously stop and join pthread */
668 frr_pthread_stop(client
->pthread
, NULL
);
670 if (IS_ZEBRA_DEBUG_EVENT
)
671 zlog_debug("Closing client '%s'",
672 zebra_route_string(client
->proto
));
674 thread_cancel_event(zrouter
.master
, client
);
675 THREAD_OFF(client
->t_cleanup
);
676 THREAD_OFF(client
->t_process
);
678 /* destroy pthread */
679 frr_pthread_destroy(client
->pthread
);
680 client
->pthread
= NULL
;
684 * Final check in case the client struct is in use in another
685 * pthread: if not in-use, continue and free the client
687 frr_with_mutex (&client_mutex
) {
688 if (client
->busy_count
<= 0) {
689 /* remove from client list */
690 listnode_delete(zrouter
.client_list
, client
);
693 * The client session object may be in use, although
694 * the associated pthread is gone. Defer final
697 client
->is_closed
= true;
704 zserv_client_free(client
);
708 * This task is scheduled by a ZAPI client pthread on the main pthread when it
709 * wants to stop itself. When this executes, the client connection should
710 * already have been closed and the thread will most likely have died, but its
711 * resources still need to be cleaned up.
713 static void zserv_handle_client_fail(struct thread
*thread
)
715 struct zserv
*client
= THREAD_ARG(thread
);
717 zserv_close_client(client
);
721 * Create a new client.
723 * This is called when a new connection is accept()'d on the ZAPI socket. It
724 * initializes new client structure, notifies any subscribers of the connection
725 * event and spawns the client's thread.
728 * client's socket file descriptor
730 static struct zserv
*zserv_client_create(int sock
)
732 struct zserv
*client
;
734 MAX(ZEBRA_MAX_PACKET_SIZ
, sizeof(struct zapi_route
));
738 client
= XCALLOC(MTYPE_TMP
, sizeof(struct zserv
));
740 /* Make client input/output buffer. */
742 client
->ibuf_fifo
= stream_fifo_new();
743 client
->obuf_fifo
= stream_fifo_new();
744 client
->ibuf_work
= stream_new(stream_size
);
745 client
->obuf_work
= stream_new(stream_size
);
746 pthread_mutex_init(&client
->ibuf_mtx
, NULL
);
747 pthread_mutex_init(&client
->obuf_mtx
, NULL
);
748 client
->wb
= buffer_new(0);
749 TAILQ_INIT(&(client
->gr_info_queue
));
751 atomic_store_explicit(&client
->connect_time
, (uint32_t) monotime(NULL
),
752 memory_order_relaxed
);
754 /* Initialize flags */
755 for (afi
= AFI_IP
; afi
< AFI_MAX
; afi
++) {
756 for (i
= 0; i
< ZEBRA_ROUTE_MAX
; i
++)
757 client
->redist
[afi
][i
] = vrf_bitmap_init();
758 client
->redist_default
[afi
] = vrf_bitmap_init();
759 client
->ridinfo
[afi
] = vrf_bitmap_init();
760 client
->nhrp_neighinfo
[afi
] = vrf_bitmap_init();
763 /* Add this client to linked list. */
764 frr_with_mutex (&client_mutex
) {
765 listnode_add(zrouter
.client_list
, client
);
768 struct frr_pthread_attr zclient_pthr_attrs
= {
769 .start
= frr_pthread_attr_default
.start
,
770 .stop
= frr_pthread_attr_default
.stop
773 frr_pthread_new(&zclient_pthr_attrs
, "Zebra API client thread",
776 /* start read loop */
777 zserv_client_event(client
, ZSERV_CLIENT_READ
);
780 hook_call(zserv_client_connect
, client
);
783 frr_pthread_run(client
->pthread
, NULL
);
789 * Retrieve a client object by the complete tuple of
790 * {protocol, instance, session}. This version supports use
791 * from a different pthread: the object will be returned marked
792 * in-use. The caller *must* release the client object with the
793 * release_client() api, to ensure that the in-use marker is cleared properly.
795 struct zserv
*zserv_acquire_client(uint8_t proto
, unsigned short instance
,
798 struct zserv
*client
= NULL
;
800 frr_with_mutex (&client_mutex
) {
801 client
= find_client_internal(proto
, instance
, session_id
);
803 /* Don't return a dead/closed client object */
804 if (client
->is_closed
)
807 client
->busy_count
++;
815 * Release a client object that was acquired with the acquire_client() api.
816 * After this has been called, the caller must not use the client pointer -
817 * it may be freed if the client has closed.
819 void zserv_release_client(struct zserv
*client
)
822 * Once we've decremented the client object's refcount, it's possible
823 * for it to be deleted as soon as we release the lock, so we won't
824 * touch the object again.
826 frr_with_mutex (&client_mutex
) {
827 client
->busy_count
--;
829 if (client
->busy_count
<= 0) {
831 * No more users of the client object. If the client
832 * session is closed, schedule cleanup on the zebra
835 if (client
->is_closed
)
836 thread_add_event(zrouter
.master
,
837 zserv_handle_client_fail
,
838 client
, 0, &client
->t_cleanup
);
843 * Cleanup must take place on the zebra main pthread, so we've
844 * scheduled an event.
849 * Accept socket connection.
851 static void zserv_accept(struct thread
*thread
)
855 struct sockaddr_in client
;
858 accept_sock
= THREAD_FD(thread
);
860 /* Reregister myself. */
861 zserv_event(NULL
, ZSERV_ACCEPT
);
863 len
= sizeof(struct sockaddr_in
);
864 client_sock
= accept(accept_sock
, (struct sockaddr
*)&client
, &len
);
866 if (client_sock
< 0) {
867 flog_err_sys(EC_LIB_SOCKET
, "Can't accept zebra socket: %s",
868 safe_strerror(errno
));
872 /* Make client socket non-blocking. */
873 set_nonblocking(client_sock
);
875 /* Create new zebra client. */
876 zserv_client_create(client_sock
);
879 void zserv_close(void)
882 * On shutdown, let's close the socket down
883 * so that long running processes of killing the
884 * routing table doesn't leave us in a bad
885 * state where a client tries to reconnect
890 /* Free client list's mutex */
891 pthread_mutex_destroy(&client_mutex
);
894 void zserv_start(char *path
)
898 struct sockaddr_storage sa
;
901 if (!frr_zclient_addr(&sa
, &sa_len
, path
))
902 /* should be caught in zebra main() */
906 old_mask
= umask(0077);
908 /* Make UNIX domain socket. */
909 zsock
= socket(sa
.ss_family
, SOCK_STREAM
, 0);
911 flog_err_sys(EC_LIB_SOCKET
, "Can't create zserv socket: %s",
912 safe_strerror(errno
));
916 if (sa
.ss_family
!= AF_UNIX
) {
917 sockopt_reuseaddr(zsock
);
918 sockopt_reuseport(zsock
);
920 struct sockaddr_un
*suna
= (struct sockaddr_un
*)&sa
;
921 if (suna
->sun_path
[0])
922 unlink(suna
->sun_path
);
925 setsockopt_so_recvbuf(zsock
, 1048576);
926 setsockopt_so_sendbuf(zsock
, 1048576);
928 frr_with_privs((sa
.ss_family
!= AF_UNIX
) ? &zserv_privs
: NULL
) {
929 ret
= bind(zsock
, (struct sockaddr
*)&sa
, sa_len
);
932 flog_err_sys(EC_LIB_SOCKET
, "Can't bind zserv socket on %s: %s",
933 path
, safe_strerror(errno
));
939 ret
= listen(zsock
, 5);
941 flog_err_sys(EC_LIB_SOCKET
,
942 "Can't listen to zserv socket %s: %s", path
,
943 safe_strerror(errno
));
951 zserv_event(NULL
, ZSERV_ACCEPT
);
954 void zserv_event(struct zserv
*client
, enum zserv_event event
)
958 thread_add_read(zrouter
.master
, zserv_accept
, NULL
, zsock
,
961 case ZSERV_PROCESS_MESSAGES
:
962 thread_add_event(zrouter
.master
, zserv_process_messages
, client
,
963 0, &client
->t_process
);
965 case ZSERV_HANDLE_CLIENT_FAIL
:
966 thread_add_event(zrouter
.master
, zserv_handle_client_fail
,
967 client
, 0, &client
->t_cleanup
);
972 /* General purpose ---------------------------------------------------------- */
974 #define ZEBRA_TIME_BUF 32
975 static char *zserv_time_buf(time_t *time1
, char *buf
, int buflen
)
980 assert(buflen
>= ZEBRA_TIME_BUF
);
981 assert(time1
!= NULL
);
984 snprintf(buf
, buflen
, "never ");
988 now
= monotime(NULL
);
991 frrtime_to_interval(now
, buf
, buflen
);
996 /* Display client info details */
997 static void zebra_show_client_detail(struct vty
*vty
, struct zserv
*client
)
999 char cbuf
[ZEBRA_TIME_BUF
], rbuf
[ZEBRA_TIME_BUF
];
1000 char wbuf
[ZEBRA_TIME_BUF
], nhbuf
[ZEBRA_TIME_BUF
], mbuf
[ZEBRA_TIME_BUF
];
1001 time_t connect_time
, last_read_time
, last_write_time
;
1002 uint32_t last_read_cmd
, last_write_cmd
;
1004 vty_out(vty
, "Client: %s", zebra_route_string(client
->proto
));
1005 if (client
->instance
)
1006 vty_out(vty
, " Instance: %u", client
->instance
);
1007 if (client
->session_id
)
1008 vty_out(vty
, " [%u]", client
->session_id
);
1011 vty_out(vty
, "------------------------ \n");
1012 vty_out(vty
, "FD: %d \n", client
->sock
);
1014 connect_time
= (time_t) atomic_load_explicit(&client
->connect_time
,
1015 memory_order_relaxed
);
1017 vty_out(vty
, "Connect Time: %s \n",
1018 zserv_time_buf(&connect_time
, cbuf
, ZEBRA_TIME_BUF
));
1019 if (client
->nh_reg_time
) {
1020 vty_out(vty
, "Nexthop Registry Time: %s \n",
1021 zserv_time_buf(&client
->nh_reg_time
, nhbuf
,
1023 if (client
->nh_last_upd_time
)
1024 vty_out(vty
, "Nexthop Last Update Time: %s \n",
1025 zserv_time_buf(&client
->nh_last_upd_time
, mbuf
,
1028 vty_out(vty
, "No Nexthop Update sent\n");
1030 vty_out(vty
, "Not registered for Nexthop Updates\n");
1032 vty_out(vty
, "Client will %sbe notified about it's routes status\n",
1033 client
->notify_owner
? "" : "Not ");
1035 last_read_time
= (time_t)atomic_load_explicit(&client
->last_read_time
,
1036 memory_order_relaxed
);
1037 last_write_time
= (time_t)atomic_load_explicit(&client
->last_write_time
,
1038 memory_order_relaxed
);
1040 last_read_cmd
= atomic_load_explicit(&client
->last_read_cmd
,
1041 memory_order_relaxed
);
1042 last_write_cmd
= atomic_load_explicit(&client
->last_write_cmd
,
1043 memory_order_relaxed
);
1045 vty_out(vty
, "Last Msg Rx Time: %s \n",
1046 zserv_time_buf(&last_read_time
, rbuf
, ZEBRA_TIME_BUF
));
1047 vty_out(vty
, "Last Msg Tx Time: %s \n",
1048 zserv_time_buf(&last_write_time
, wbuf
, ZEBRA_TIME_BUF
));
1050 vty_out(vty
, "Last Rcvd Cmd: %s \n",
1051 zserv_command_string(last_read_cmd
));
1053 vty_out(vty
, "Last Sent Cmd: %s \n",
1054 zserv_command_string(last_write_cmd
));
1057 vty_out(vty
, "Type Add Update Del \n");
1058 vty_out(vty
, "================================================== \n");
1059 vty_out(vty
, "IPv4 %-12u%-12u%-12u\n", client
->v4_route_add_cnt
,
1060 client
->v4_route_upd8_cnt
, client
->v4_route_del_cnt
);
1061 vty_out(vty
, "IPv6 %-12u%-12u%-12u\n", client
->v6_route_add_cnt
,
1062 client
->v6_route_upd8_cnt
, client
->v6_route_del_cnt
);
1063 vty_out(vty
, "Redist:v4 %-12u%-12u%-12u\n", client
->redist_v4_add_cnt
,
1064 0, client
->redist_v4_del_cnt
);
1065 vty_out(vty
, "Redist:v6 %-12u%-12u%-12u\n", client
->redist_v6_add_cnt
,
1066 0, client
->redist_v6_del_cnt
);
1067 vty_out(vty
, "VRF %-12u%-12u%-12u\n", client
->vrfadd_cnt
, 0,
1068 client
->vrfdel_cnt
);
1069 vty_out(vty
, "Connected %-12u%-12u%-12u\n", client
->ifadd_cnt
, 0,
1071 vty_out(vty
, "Interface %-12u%-12u%-12u\n", client
->ifup_cnt
, 0,
1072 client
->ifdown_cnt
);
1073 vty_out(vty
, "Intf Addr %-12u%-12u%-12u\n",
1074 client
->connected_rt_add_cnt
, 0, client
->connected_rt_del_cnt
);
1075 vty_out(vty
, "BFD peer %-12u%-12u%-12u\n", client
->bfd_peer_add_cnt
,
1076 client
->bfd_peer_upd8_cnt
, client
->bfd_peer_del_cnt
);
1077 vty_out(vty
, "NHT v4 %-12u%-12u%-12u\n",
1078 client
->v4_nh_watch_add_cnt
, 0, client
->v4_nh_watch_rem_cnt
);
1079 vty_out(vty
, "NHT v6 %-12u%-12u%-12u\n",
1080 client
->v6_nh_watch_add_cnt
, 0, client
->v6_nh_watch_rem_cnt
);
1081 vty_out(vty
, "VxLAN SG %-12u%-12u%-12u\n", client
->vxlan_sg_add_cnt
,
1082 0, client
->vxlan_sg_del_cnt
);
1083 vty_out(vty
, "VNI %-12u%-12u%-12u\n", client
->vniadd_cnt
, 0,
1084 client
->vnidel_cnt
);
1085 vty_out(vty
, "L3-VNI %-12u%-12u%-12u\n", client
->l3vniadd_cnt
, 0,
1086 client
->l3vnidel_cnt
);
1087 vty_out(vty
, "MAC-IP %-12u%-12u%-12u\n", client
->macipadd_cnt
, 0,
1088 client
->macipdel_cnt
);
1089 vty_out(vty
, "ES %-12u%-12u%-12u\n", client
->local_es_add_cnt
,
1090 0, client
->local_es_del_cnt
);
1091 vty_out(vty
, "ES-EVI %-12u%-12u%-12u\n",
1092 client
->local_es_evi_add_cnt
, 0, client
->local_es_evi_del_cnt
);
1093 vty_out(vty
, "Errors: %u\n", client
->error_cnt
);
1095 #if defined DEV_BUILD
1096 vty_out(vty
, "Input Fifo: %zu:%zu Output Fifo: %zu:%zu\n",
1097 client
->ibuf_fifo
->count
, client
->ibuf_fifo
->max_count
,
1098 client
->obuf_fifo
->count
, client
->obuf_fifo
->max_count
);
1103 /* Display stale client information */
1104 static void zebra_show_stale_client_detail(struct vty
*vty
,
1105 struct zserv
*client
)
1107 char buf
[PREFIX2STR_BUFFER
];
1109 struct client_gr_info
*info
= NULL
;
1110 struct zserv
*s
= NULL
;
1111 bool first_p
= true;
1113 TAILQ_FOREACH (info
, &client
->gr_info_queue
, gr_info
) {
1115 vty_out(vty
, "Stale Client Information\n");
1116 vty_out(vty
, "------------------------\n");
1118 if (client
->instance
)
1119 vty_out(vty
, " Instance: %u", client
->instance
);
1120 if (client
->session_id
)
1121 vty_out(vty
, " [%u]", client
->session_id
);
1126 vty_out(vty
, "VRF : %s\n", vrf_id_to_name(info
->vrf_id
));
1127 vty_out(vty
, "Capabilities : ");
1128 switch (info
->capabilities
) {
1129 case ZEBRA_CLIENT_GR_CAPABILITIES
:
1130 vty_out(vty
, "Graceful Restart(%u seconds)\n",
1131 info
->stale_removal_time
);
1133 case ZEBRA_CLIENT_ROUTE_UPDATE_COMPLETE
:
1134 case ZEBRA_CLIENT_ROUTE_UPDATE_PENDING
:
1135 case ZEBRA_CLIENT_GR_DISABLE
:
1136 case ZEBRA_CLIENT_RIB_STALE_TIME
:
1137 vty_out(vty
, "None\n");
1141 if (ZEBRA_CLIENT_GR_ENABLED(info
->capabilities
)) {
1142 if (info
->stale_client_ptr
) {
1143 s
= (struct zserv
*)(info
->stale_client_ptr
);
1144 uptime
= monotime(NULL
);
1145 uptime
-= s
->restart_time
;
1147 frrtime_to_interval(uptime
, buf
, sizeof(buf
));
1149 vty_out(vty
, "Last restart time : %s ago\n",
1152 vty_out(vty
, "Stalepath removal time: %d sec\n",
1153 info
->stale_removal_time
);
1154 if (info
->t_stale_removal
) {
1156 "Stale delete timer: %ld sec\n",
1157 thread_timer_remain_second(
1158 info
->t_stale_removal
));
1161 vty_out(vty
, "Current AFI : %d\n", info
->current_afi
);
1162 if (info
->current_prefix
)
1163 vty_out(vty
, "Current prefix : %pFX\n",
1164 info
->current_prefix
);
1171 static void zebra_show_client_brief(struct vty
*vty
, struct zserv
*client
)
1173 char client_string
[80];
1174 char cbuf
[ZEBRA_TIME_BUF
], rbuf
[ZEBRA_TIME_BUF
];
1175 char wbuf
[ZEBRA_TIME_BUF
];
1176 time_t connect_time
, last_read_time
, last_write_time
;
1178 connect_time
= (time_t)atomic_load_explicit(&client
->connect_time
,
1179 memory_order_relaxed
);
1180 last_read_time
= (time_t)atomic_load_explicit(&client
->last_read_time
,
1181 memory_order_relaxed
);
1182 last_write_time
= (time_t)atomic_load_explicit(&client
->last_write_time
,
1183 memory_order_relaxed
);
1185 if (client
->instance
|| client
->session_id
)
1186 snprintfrr(client_string
, sizeof(client_string
), "%s[%u:%u]",
1187 zebra_route_string(client
->proto
), client
->instance
,
1188 client
->session_id
);
1190 snprintfrr(client_string
, sizeof(client_string
), "%s",
1191 zebra_route_string(client
->proto
));
1193 vty_out(vty
, "%-10s%12s %12s%12s %10d/%-10d %10d/%-10d\n",
1195 zserv_time_buf(&connect_time
, cbuf
, ZEBRA_TIME_BUF
),
1196 zserv_time_buf(&last_read_time
, rbuf
, ZEBRA_TIME_BUF
),
1197 zserv_time_buf(&last_write_time
, wbuf
, ZEBRA_TIME_BUF
),
1198 client
->v4_route_add_cnt
+ client
->v4_route_upd8_cnt
,
1199 client
->v4_route_del_cnt
,
1200 client
->v6_route_add_cnt
+ client
->v6_route_upd8_cnt
,
1201 client
->v6_route_del_cnt
);
1205 * Common logic that searches the client list for a zapi client; this
1206 * MUST be called holding the client list mutex.
1208 static struct zserv
*find_client_internal(uint8_t proto
,
1209 unsigned short instance
,
1210 uint32_t session_id
)
1212 struct listnode
*node
, *nnode
;
1213 struct zserv
*client
= NULL
;
1215 for (ALL_LIST_ELEMENTS(zrouter
.client_list
, node
, nnode
, client
)) {
1216 if (client
->proto
== proto
&& client
->instance
== instance
&&
1217 client
->session_id
== session_id
)
1225 * Public api that searches for a client session; this version is
1226 * used from the zebra main pthread.
1228 struct zserv
*zserv_find_client(uint8_t proto
, unsigned short instance
)
1230 struct zserv
*client
;
1232 frr_with_mutex (&client_mutex
) {
1233 client
= find_client_internal(proto
, instance
, 0);
1240 * Retrieve a client by its protocol, instance number, and session id.
1242 struct zserv
*zserv_find_client_session(uint8_t proto
, unsigned short instance
,
1243 uint32_t session_id
)
1245 struct zserv
*client
;
1247 frr_with_mutex (&client_mutex
) {
1248 client
= find_client_internal(proto
, instance
, session_id
);
1255 /* This command is for debugging purpose. */
1256 DEFUN (show_zebra_client
,
1257 show_zebra_client_cmd
,
1258 "show zebra client",
1261 "Client information\n")
1263 struct listnode
*node
;
1264 struct zserv
*client
;
1266 for (ALL_LIST_ELEMENTS_RO(zrouter
.client_list
, node
, client
)) {
1267 zebra_show_client_detail(vty
, client
);
1268 /* Show GR info if present */
1269 zebra_show_stale_client_detail(vty
, client
);
1275 /* This command is for debugging purpose. */
1276 DEFUN (show_zebra_client_summary
,
1277 show_zebra_client_summary_cmd
,
1278 "show zebra client summary",
1281 "Client information brief\n"
1284 struct listnode
*node
;
1285 struct zserv
*client
;
1288 "Name Connect Time Last Read Last Write IPv4 Routes IPv6 Routes\n");
1290 "------------------------------------------------------------------------------------------\n");
1292 for (ALL_LIST_ELEMENTS_RO(zrouter
.client_list
, node
, client
))
1293 zebra_show_client_brief(vty
, client
);
1295 vty_out(vty
, "Routes column shows (added+updated)/deleted\n");
1299 static int zserv_client_close_cb(struct zserv
*closed_client
)
1301 struct listnode
*node
, *nnode
;
1302 struct zserv
*client
= NULL
;
1304 for (ALL_LIST_ELEMENTS(zrouter
.client_list
, node
, nnode
, client
)) {
1305 if (client
->proto
== closed_client
->proto
)
1308 zsend_client_close_notify(client
, closed_client
);
1314 void zserv_init(void)
1316 /* Client list init. */
1317 zrouter
.client_list
= list_new();
1318 zrouter
.stale_client_list
= list_new();
1322 pthread_mutex_init(&client_mutex
, NULL
);
1324 install_element(ENABLE_NODE
, &show_zebra_client_cmd
);
1325 install_element(ENABLE_NODE
, &show_zebra_client_summary_cmd
);
1327 hook_register(zserv_client_close
, zserv_client_close_cb
);