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|
/*
* Main implementation file for interface to Forwarding Plane Manager.
*
* Copyright (C) 2012 by Open Source Routing.
* Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra 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
*/
#include <zebra.h>
#include "log.h"
#include "libfrr.h"
#include "stream.h"
#include "thread.h"
#include "network.h"
#include "command.h"
#include "version.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/zebra_ns.h"
#include "zebra/zebra_vrf.h"
#include "fpm/fpm.h"
#include "zebra_fpm_private.h"
/*
* Interval at which we attempt to connect to the FPM.
*/
#define ZFPM_CONNECT_RETRY_IVL 5
/*
* Sizes of outgoing and incoming stream buffers for writing/reading
* FPM messages.
*/
#define ZFPM_OBUF_SIZE (2 * FPM_MAX_MSG_LEN)
#define ZFPM_IBUF_SIZE (FPM_MAX_MSG_LEN)
/*
* The maximum number of times the FPM socket write callback can call
* 'write' before it yields.
*/
#define ZFPM_MAX_WRITES_PER_RUN 10
/*
* Interval over which we collect statistics.
*/
#define ZFPM_STATS_IVL_SECS 10
/*
* Structure that holds state for iterating over all route_node
* structures that are candidates for being communicated to the FPM.
*/
typedef struct zfpm_rnodes_iter_t_ {
rib_tables_iter_t tables_iter;
route_table_iter_t iter;
} zfpm_rnodes_iter_t;
/*
* Statistics.
*/
typedef struct zfpm_stats_t_ {
unsigned long connect_calls;
unsigned long connect_no_sock;
unsigned long read_cb_calls;
unsigned long write_cb_calls;
unsigned long write_calls;
unsigned long partial_writes;
unsigned long max_writes_hit;
unsigned long t_write_yields;
unsigned long nop_deletes_skipped;
unsigned long route_adds;
unsigned long route_dels;
unsigned long updates_triggered;
unsigned long redundant_triggers;
unsigned long dests_del_after_update;
unsigned long t_conn_down_starts;
unsigned long t_conn_down_dests_processed;
unsigned long t_conn_down_yields;
unsigned long t_conn_down_finishes;
unsigned long t_conn_up_starts;
unsigned long t_conn_up_dests_processed;
unsigned long t_conn_up_yields;
unsigned long t_conn_up_aborts;
unsigned long t_conn_up_finishes;
} zfpm_stats_t;
/*
* States for the FPM state machine.
*/
typedef enum {
/*
* In this state we are not yet ready to connect to the FPM. This
* can happen when this module is disabled, or if we're cleaning up
* after a connection has gone down.
*/
ZFPM_STATE_IDLE,
/*
* Ready to talk to the FPM and periodically trying to connect to
* it.
*/
ZFPM_STATE_ACTIVE,
/*
* In the middle of bringing up a TCP connection. Specifically,
* waiting for a connect() call to complete asynchronously.
*/
ZFPM_STATE_CONNECTING,
/*
* TCP connection to the FPM is up.
*/
ZFPM_STATE_ESTABLISHED
} zfpm_state_t;
/*
* Message format to be used to communicate with the FPM.
*/
typedef enum {
ZFPM_MSG_FORMAT_NONE,
ZFPM_MSG_FORMAT_NETLINK,
ZFPM_MSG_FORMAT_PROTOBUF,
} zfpm_msg_format_e;
/*
* Globals.
*/
typedef struct zfpm_glob_t_ {
/*
* True if the FPM module has been enabled.
*/
int enabled;
/*
* Message format to be used to communicate with the fpm.
*/
zfpm_msg_format_e message_format;
struct thread_master *master;
zfpm_state_t state;
in_addr_t fpm_server;
/*
* Port on which the FPM is running.
*/
int fpm_port;
/*
* List of rib_dest_t structures to be processed
*/
TAILQ_HEAD(zfpm_dest_q, rib_dest_t_) dest_q;
/*
* Stream socket to the FPM.
*/
int sock;
/*
* Buffers for messages to/from the FPM.
*/
struct stream *obuf;
struct stream *ibuf;
/*
* Threads for I/O.
*/
struct thread *t_connect;
struct thread *t_write;
struct thread *t_read;
/*
* Thread to clean up after the TCP connection to the FPM goes down
* and the state that belongs to it.
*/
struct thread *t_conn_down;
struct {
zfpm_rnodes_iter_t iter;
} t_conn_down_state;
/*
* Thread to take actions once the TCP conn to the FPM comes up, and
* the state that belongs to it.
*/
struct thread *t_conn_up;
struct {
zfpm_rnodes_iter_t iter;
} t_conn_up_state;
unsigned long connect_calls;
time_t last_connect_call_time;
/*
* Stats from the start of the current statistics interval up to
* now. These are the counters we typically update in the code.
*/
zfpm_stats_t stats;
/*
* Statistics that were gathered in the last collection interval.
*/
zfpm_stats_t last_ivl_stats;
/*
* Cumulative stats from the last clear to the start of the current
* statistics interval.
*/
zfpm_stats_t cumulative_stats;
/*
* Stats interval timer.
*/
struct thread *t_stats;
/*
* If non-zero, the last time when statistics were cleared.
*/
time_t last_stats_clear_time;
} zfpm_glob_t;
static zfpm_glob_t zfpm_glob_space;
static zfpm_glob_t *zfpm_g = &zfpm_glob_space;
static int zfpm_trigger_update(struct route_node *rn, const char *reason);
static int zfpm_read_cb(struct thread *thread);
static int zfpm_write_cb(struct thread *thread);
static void zfpm_set_state(zfpm_state_t state, const char *reason);
static void zfpm_start_connect_timer(const char *reason);
static void zfpm_start_stats_timer(void);
/*
* zfpm_thread_should_yield
*/
static inline int zfpm_thread_should_yield(struct thread *t)
{
return thread_should_yield(t);
}
/*
* zfpm_state_to_str
*/
static const char *zfpm_state_to_str(zfpm_state_t state)
{
switch (state) {
case ZFPM_STATE_IDLE:
return "idle";
case ZFPM_STATE_ACTIVE:
return "active";
case ZFPM_STATE_CONNECTING:
return "connecting";
case ZFPM_STATE_ESTABLISHED:
return "established";
default:
return "unknown";
}
}
/*
* zfpm_get_elapsed_time
*
* Returns the time elapsed (in seconds) since the given time.
*/
static time_t zfpm_get_elapsed_time(time_t reference)
{
time_t now;
now = monotime(NULL);
if (now < reference) {
assert(0);
return 0;
}
return now - reference;
}
/*
* zfpm_rnodes_iter_init
*/
static inline void zfpm_rnodes_iter_init(zfpm_rnodes_iter_t *iter)
{
memset(iter, 0, sizeof(*iter));
rib_tables_iter_init(&iter->tables_iter);
/*
* This is a hack, but it makes implementing 'next' easier by
* ensuring that route_table_iter_next() will return NULL the first
* time we call it.
*/
route_table_iter_init(&iter->iter, NULL);
route_table_iter_cleanup(&iter->iter);
}
/*
* zfpm_rnodes_iter_next
*/
static inline struct route_node *zfpm_rnodes_iter_next(zfpm_rnodes_iter_t *iter)
{
struct route_node *rn;
struct route_table *table;
while (1) {
rn = route_table_iter_next(&iter->iter);
if (rn)
return rn;
/*
* We've made our way through this table, go to the next one.
*/
route_table_iter_cleanup(&iter->iter);
table = rib_tables_iter_next(&iter->tables_iter);
if (!table)
return NULL;
route_table_iter_init(&iter->iter, table);
}
return NULL;
}
/*
* zfpm_rnodes_iter_pause
*/
static inline void zfpm_rnodes_iter_pause(zfpm_rnodes_iter_t *iter)
{
route_table_iter_pause(&iter->iter);
}
/*
* zfpm_rnodes_iter_cleanup
*/
static inline void zfpm_rnodes_iter_cleanup(zfpm_rnodes_iter_t *iter)
{
route_table_iter_cleanup(&iter->iter);
rib_tables_iter_cleanup(&iter->tables_iter);
}
/*
* zfpm_stats_init
*
* Initialize a statistics block.
*/
static inline void zfpm_stats_init(zfpm_stats_t *stats)
{
memset(stats, 0, sizeof(*stats));
}
/*
* zfpm_stats_reset
*/
static inline void zfpm_stats_reset(zfpm_stats_t *stats)
{
zfpm_stats_init(stats);
}
/*
* zfpm_stats_copy
*/
static inline void zfpm_stats_copy(const zfpm_stats_t *src, zfpm_stats_t *dest)
{
memcpy(dest, src, sizeof(*dest));
}
/*
* zfpm_stats_compose
*
* Total up the statistics in two stats structures ('s1 and 's2') and
* return the result in the third argument, 'result'. Note that the
* pointer 'result' may be the same as 's1' or 's2'.
*
* For simplicity, the implementation below assumes that the stats
* structure is composed entirely of counters. This can easily be
* changed when necessary.
*/
static void zfpm_stats_compose(const zfpm_stats_t *s1, const zfpm_stats_t *s2,
zfpm_stats_t *result)
{
const unsigned long *p1, *p2;
unsigned long *result_p;
int i, num_counters;
p1 = (const unsigned long *)s1;
p2 = (const unsigned long *)s2;
result_p = (unsigned long *)result;
num_counters = (sizeof(zfpm_stats_t) / sizeof(unsigned long));
for (i = 0; i < num_counters; i++) {
result_p[i] = p1[i] + p2[i];
}
}
/*
* zfpm_read_on
*/
static inline void zfpm_read_on(void)
{
assert(!zfpm_g->t_read);
assert(zfpm_g->sock >= 0);
thread_add_read(zfpm_g->master, zfpm_read_cb, 0, zfpm_g->sock,
&zfpm_g->t_read);
}
/*
* zfpm_write_on
*/
static inline void zfpm_write_on(void)
{
assert(!zfpm_g->t_write);
assert(zfpm_g->sock >= 0);
thread_add_write(zfpm_g->master, zfpm_write_cb, 0, zfpm_g->sock,
&zfpm_g->t_write);
}
/*
* zfpm_read_off
*/
static inline void zfpm_read_off(void)
{
THREAD_READ_OFF(zfpm_g->t_read);
}
/*
* zfpm_write_off
*/
static inline void zfpm_write_off(void)
{
THREAD_WRITE_OFF(zfpm_g->t_write);
}
/*
* zfpm_conn_up_thread_cb
*
* Callback for actions to be taken when the connection to the FPM
* comes up.
*/
static int zfpm_conn_up_thread_cb(struct thread *thread)
{
struct route_node *rnode;
zfpm_rnodes_iter_t *iter;
rib_dest_t *dest;
zfpm_g->t_conn_up = NULL;
iter = &zfpm_g->t_conn_up_state.iter;
if (zfpm_g->state != ZFPM_STATE_ESTABLISHED) {
zfpm_debug(
"Connection not up anymore, conn_up thread aborting");
zfpm_g->stats.t_conn_up_aborts++;
goto done;
}
while ((rnode = zfpm_rnodes_iter_next(iter))) {
dest = rib_dest_from_rnode(rnode);
if (dest) {
zfpm_g->stats.t_conn_up_dests_processed++;
zfpm_trigger_update(rnode, NULL);
}
/*
* Yield if need be.
*/
if (!zfpm_thread_should_yield(thread))
continue;
zfpm_g->stats.t_conn_up_yields++;
zfpm_rnodes_iter_pause(iter);
zfpm_g->t_conn_up = NULL;
thread_add_timer_msec(zfpm_g->master, zfpm_conn_up_thread_cb,
NULL, 0, &zfpm_g->t_conn_up);
return 0;
}
zfpm_g->stats.t_conn_up_finishes++;
done:
zfpm_rnodes_iter_cleanup(iter);
return 0;
}
/*
* zfpm_connection_up
*
* Called when the connection to the FPM comes up.
*/
static void zfpm_connection_up(const char *detail)
{
assert(zfpm_g->sock >= 0);
zfpm_read_on();
zfpm_write_on();
zfpm_set_state(ZFPM_STATE_ESTABLISHED, detail);
/*
* Start thread to push existing routes to the FPM.
*/
assert(!zfpm_g->t_conn_up);
zfpm_rnodes_iter_init(&zfpm_g->t_conn_up_state.iter);
zfpm_debug("Starting conn_up thread");
zfpm_g->t_conn_up = NULL;
thread_add_timer_msec(zfpm_g->master, zfpm_conn_up_thread_cb, NULL, 0,
&zfpm_g->t_conn_up);
zfpm_g->stats.t_conn_up_starts++;
}
/*
* zfpm_connect_check
*
* Check if an asynchronous connect() to the FPM is complete.
*/
static void zfpm_connect_check(void)
{
int status;
socklen_t slen;
int ret;
zfpm_read_off();
zfpm_write_off();
slen = sizeof(status);
ret = getsockopt(zfpm_g->sock, SOL_SOCKET, SO_ERROR, (void *)&status,
&slen);
if (ret >= 0 && status == 0) {
zfpm_connection_up("async connect complete");
return;
}
/*
* getsockopt() failed or indicated an error on the socket.
*/
close(zfpm_g->sock);
zfpm_g->sock = -1;
zfpm_start_connect_timer("getsockopt() after async connect failed");
return;
}
/*
* zfpm_conn_down_thread_cb
*
* Callback that is invoked to clean up state after the TCP connection
* to the FPM goes down.
*/
static int zfpm_conn_down_thread_cb(struct thread *thread)
{
struct route_node *rnode;
zfpm_rnodes_iter_t *iter;
rib_dest_t *dest;
assert(zfpm_g->state == ZFPM_STATE_IDLE);
zfpm_g->t_conn_down = NULL;
iter = &zfpm_g->t_conn_down_state.iter;
while ((rnode = zfpm_rnodes_iter_next(iter))) {
dest = rib_dest_from_rnode(rnode);
if (dest) {
if (CHECK_FLAG(dest->flags, RIB_DEST_UPDATE_FPM)) {
TAILQ_REMOVE(&zfpm_g->dest_q, dest,
fpm_q_entries);
}
UNSET_FLAG(dest->flags, RIB_DEST_UPDATE_FPM);
UNSET_FLAG(dest->flags, RIB_DEST_SENT_TO_FPM);
zfpm_g->stats.t_conn_down_dests_processed++;
/*
* Check if the dest should be deleted.
*/
rib_gc_dest(rnode);
}
/*
* Yield if need be.
*/
if (!zfpm_thread_should_yield(thread))
continue;
zfpm_g->stats.t_conn_down_yields++;
zfpm_rnodes_iter_pause(iter);
zfpm_g->t_conn_down = NULL;
thread_add_timer_msec(zfpm_g->master, zfpm_conn_down_thread_cb,
NULL, 0, &zfpm_g->t_conn_down);
return 0;
}
zfpm_g->stats.t_conn_down_finishes++;
zfpm_rnodes_iter_cleanup(iter);
/*
* Start the process of connecting to the FPM again.
*/
zfpm_start_connect_timer("cleanup complete");
return 0;
}
/*
* zfpm_connection_down
*
* Called when the connection to the FPM has gone down.
*/
static void zfpm_connection_down(const char *detail)
{
if (!detail)
detail = "unknown";
assert(zfpm_g->state == ZFPM_STATE_ESTABLISHED);
zlog_info("connection to the FPM has gone down: %s", detail);
zfpm_read_off();
zfpm_write_off();
stream_reset(zfpm_g->ibuf);
stream_reset(zfpm_g->obuf);
if (zfpm_g->sock >= 0) {
close(zfpm_g->sock);
zfpm_g->sock = -1;
}
/*
* Start thread to clean up state after the connection goes down.
*/
assert(!zfpm_g->t_conn_down);
zfpm_debug("Starting conn_down thread");
zfpm_rnodes_iter_init(&zfpm_g->t_conn_down_state.iter);
zfpm_g->t_conn_down = NULL;
thread_add_timer_msec(zfpm_g->master, zfpm_conn_down_thread_cb, NULL, 0,
&zfpm_g->t_conn_down);
zfpm_g->stats.t_conn_down_starts++;
zfpm_set_state(ZFPM_STATE_IDLE, detail);
}
/*
* zfpm_read_cb
*/
static int zfpm_read_cb(struct thread *thread)
{
size_t already;
struct stream *ibuf;
uint16_t msg_len;
fpm_msg_hdr_t *hdr;
zfpm_g->stats.read_cb_calls++;
zfpm_g->t_read = NULL;
/*
* Check if async connect is now done.
*/
if (zfpm_g->state == ZFPM_STATE_CONNECTING) {
zfpm_connect_check();
return 0;
}
assert(zfpm_g->state == ZFPM_STATE_ESTABLISHED);
assert(zfpm_g->sock >= 0);
ibuf = zfpm_g->ibuf;
already = stream_get_endp(ibuf);
if (already < FPM_MSG_HDR_LEN) {
ssize_t nbyte;
nbyte = stream_read_try(ibuf, zfpm_g->sock,
FPM_MSG_HDR_LEN - already);
if (nbyte == 0 || nbyte == -1) {
zfpm_connection_down("closed socket in read");
return 0;
}
if (nbyte != (ssize_t)(FPM_MSG_HDR_LEN - already))
goto done;
already = FPM_MSG_HDR_LEN;
}
stream_set_getp(ibuf, 0);
hdr = (fpm_msg_hdr_t *)stream_pnt(ibuf);
if (!fpm_msg_hdr_ok(hdr)) {
zfpm_connection_down("invalid message header");
return 0;
}
msg_len = fpm_msg_len(hdr);
/*
* Read out the rest of the packet.
*/
if (already < msg_len) {
ssize_t nbyte;
nbyte = stream_read_try(ibuf, zfpm_g->sock, msg_len - already);
if (nbyte == 0 || nbyte == -1) {
zfpm_connection_down("failed to read message");
return 0;
}
if (nbyte != (ssize_t)(msg_len - already))
goto done;
}
zfpm_debug("Read out a full fpm message");
/*
* Just throw it away for now.
*/
stream_reset(ibuf);
done:
zfpm_read_on();
return 0;
}
/*
* zfpm_writes_pending
*
* Returns TRUE if we may have something to write to the FPM.
*/
static int zfpm_writes_pending(void)
{
/*
* Check if there is any data in the outbound buffer that has not
* been written to the socket yet.
*/
if (stream_get_endp(zfpm_g->obuf) - stream_get_getp(zfpm_g->obuf))
return 1;
/*
* Check if there are any prefixes on the outbound queue.
*/
if (!TAILQ_EMPTY(&zfpm_g->dest_q))
return 1;
return 0;
}
/*
* zfpm_encode_route
*
* Encode a message to the FPM with information about the given route.
*
* Returns the number of bytes written to the buffer. 0 or a negative
* value indicates an error.
*/
static inline int zfpm_encode_route(rib_dest_t *dest, struct route_entry *re,
char *in_buf, size_t in_buf_len,
fpm_msg_type_e *msg_type)
{
size_t len;
#ifdef HAVE_NETLINK
int cmd;
#endif
len = 0;
*msg_type = FPM_MSG_TYPE_NONE;
switch (zfpm_g->message_format) {
case ZFPM_MSG_FORMAT_PROTOBUF:
#ifdef HAVE_PROTOBUF
len = zfpm_protobuf_encode_route(dest, re, (uint8_t *)in_buf,
in_buf_len);
*msg_type = FPM_MSG_TYPE_PROTOBUF;
#endif
break;
case ZFPM_MSG_FORMAT_NETLINK:
#ifdef HAVE_NETLINK
*msg_type = FPM_MSG_TYPE_NETLINK;
cmd = re ? RTM_NEWROUTE : RTM_DELROUTE;
len = zfpm_netlink_encode_route(cmd, dest, re, in_buf,
in_buf_len);
assert(fpm_msg_align(len) == len);
*msg_type = FPM_MSG_TYPE_NETLINK;
#endif /* HAVE_NETLINK */
break;
default:
break;
}
return len;
}
/*
* zfpm_route_for_update
*
* Returns the re that is to be sent to the FPM for a given dest.
*/
struct route_entry *zfpm_route_for_update(rib_dest_t *dest)
{
return dest->selected_fib;
}
/*
* zfpm_build_updates
*
* Process the outgoing queue and write messages to the outbound
* buffer.
*/
static void zfpm_build_updates(void)
{
struct stream *s;
rib_dest_t *dest;
unsigned char *buf, *data, *buf_end;
size_t msg_len;
size_t data_len;
fpm_msg_hdr_t *hdr;
struct route_entry *re;
int is_add, write_msg;
fpm_msg_type_e msg_type;
s = zfpm_g->obuf;
assert(stream_empty(s));
do {
/*
* Make sure there is enough space to write another message.
*/
if (STREAM_WRITEABLE(s) < FPM_MAX_MSG_LEN)
break;
buf = STREAM_DATA(s) + stream_get_endp(s);
buf_end = buf + STREAM_WRITEABLE(s);
dest = TAILQ_FIRST(&zfpm_g->dest_q);
if (!dest)
break;
assert(CHECK_FLAG(dest->flags, RIB_DEST_UPDATE_FPM));
hdr = (fpm_msg_hdr_t *)buf;
hdr->version = FPM_PROTO_VERSION;
data = fpm_msg_data(hdr);
re = zfpm_route_for_update(dest);
is_add = re ? 1 : 0;
write_msg = 1;
/*
* If this is a route deletion, and we have not sent the route
* to
* the FPM previously, skip it.
*/
if (!is_add && !CHECK_FLAG(dest->flags, RIB_DEST_SENT_TO_FPM)) {
write_msg = 0;
zfpm_g->stats.nop_deletes_skipped++;
}
if (write_msg) {
data_len = zfpm_encode_route(dest, re, (char *)data,
buf_end - data, &msg_type);
assert(data_len);
if (data_len) {
hdr->msg_type = msg_type;
msg_len = fpm_data_len_to_msg_len(data_len);
hdr->msg_len = htons(msg_len);
stream_forward_endp(s, msg_len);
if (is_add)
zfpm_g->stats.route_adds++;
else
zfpm_g->stats.route_dels++;
}
}
/*
* Remove the dest from the queue, and reset the flag.
*/
UNSET_FLAG(dest->flags, RIB_DEST_UPDATE_FPM);
TAILQ_REMOVE(&zfpm_g->dest_q, dest, fpm_q_entries);
if (is_add) {
SET_FLAG(dest->flags, RIB_DEST_SENT_TO_FPM);
} else {
UNSET_FLAG(dest->flags, RIB_DEST_SENT_TO_FPM);
}
/*
* Delete the destination if necessary.
*/
if (rib_gc_dest(dest->rnode))
zfpm_g->stats.dests_del_after_update++;
} while (1);
}
/*
* zfpm_write_cb
*/
static int zfpm_write_cb(struct thread *thread)
{
struct stream *s;
int num_writes;
zfpm_g->stats.write_cb_calls++;
zfpm_g->t_write = NULL;
/*
* Check if async connect is now done.
*/
if (zfpm_g->state == ZFPM_STATE_CONNECTING) {
zfpm_connect_check();
return 0;
}
assert(zfpm_g->state == ZFPM_STATE_ESTABLISHED);
assert(zfpm_g->sock >= 0);
num_writes = 0;
do {
int bytes_to_write, bytes_written;
s = zfpm_g->obuf;
/*
* If the stream is empty, try fill it up with data.
*/
if (stream_empty(s)) {
zfpm_build_updates();
}
bytes_to_write = stream_get_endp(s) - stream_get_getp(s);
if (!bytes_to_write)
break;
bytes_written =
write(zfpm_g->sock, stream_pnt(s), bytes_to_write);
zfpm_g->stats.write_calls++;
num_writes++;
if (bytes_written < 0) {
if (ERRNO_IO_RETRY(errno))
break;
zfpm_connection_down("failed to write to socket");
return 0;
}
if (bytes_written != bytes_to_write) {
/*
* Partial write.
*/
stream_forward_getp(s, bytes_written);
zfpm_g->stats.partial_writes++;
break;
}
/*
* We've written out the entire contents of the stream.
*/
stream_reset(s);
if (num_writes >= ZFPM_MAX_WRITES_PER_RUN) {
zfpm_g->stats.max_writes_hit++;
break;
}
if (zfpm_thread_should_yield(thread)) {
zfpm_g->stats.t_write_yields++;
break;
}
} while (1);
if (zfpm_writes_pending())
zfpm_write_on();
return 0;
}
/*
* zfpm_connect_cb
*/
static int zfpm_connect_cb(struct thread *t)
{
int sock, ret;
struct sockaddr_in serv;
zfpm_g->t_connect = NULL;
assert(zfpm_g->state == ZFPM_STATE_ACTIVE);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0) {
zfpm_debug("Failed to create socket for connect(): %s",
strerror(errno));
zfpm_g->stats.connect_no_sock++;
return 0;
}
set_nonblocking(sock);
/* Make server socket. */
memset(&serv, 0, sizeof(serv));
serv.sin_family = AF_INET;
serv.sin_port = htons(zfpm_g->fpm_port);
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
serv.sin_len = sizeof(struct sockaddr_in);
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
if (!zfpm_g->fpm_server)
serv.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
else
serv.sin_addr.s_addr = (zfpm_g->fpm_server);
/*
* Connect to the FPM.
*/
zfpm_g->connect_calls++;
zfpm_g->stats.connect_calls++;
zfpm_g->last_connect_call_time = monotime(NULL);
ret = connect(sock, (struct sockaddr *)&serv, sizeof(serv));
if (ret >= 0) {
zfpm_g->sock = sock;
zfpm_connection_up("connect succeeded");
return 1;
}
if (errno == EINPROGRESS) {
zfpm_g->sock = sock;
zfpm_read_on();
zfpm_write_on();
zfpm_set_state(ZFPM_STATE_CONNECTING,
"async connect in progress");
return 0;
}
zlog_info("can't connect to FPM %d: %s", sock, safe_strerror(errno));
close(sock);
/*
* Restart timer for retrying connection.
*/
zfpm_start_connect_timer("connect() failed");
return 0;
}
/*
* zfpm_set_state
*
* Move state machine into the given state.
*/
static void zfpm_set_state(zfpm_state_t state, const char *reason)
{
zfpm_state_t cur_state = zfpm_g->state;
if (!reason)
reason = "Unknown";
if (state == cur_state)
return;
zfpm_debug("beginning state transition %s -> %s. Reason: %s",
zfpm_state_to_str(cur_state), zfpm_state_to_str(state),
reason);
switch (state) {
case ZFPM_STATE_IDLE:
assert(cur_state == ZFPM_STATE_ESTABLISHED);
break;
case ZFPM_STATE_ACTIVE:
assert(cur_state == ZFPM_STATE_IDLE
|| cur_state == ZFPM_STATE_CONNECTING);
assert(zfpm_g->t_connect);
break;
case ZFPM_STATE_CONNECTING:
assert(zfpm_g->sock);
assert(cur_state == ZFPM_STATE_ACTIVE);
assert(zfpm_g->t_read);
assert(zfpm_g->t_write);
break;
case ZFPM_STATE_ESTABLISHED:
assert(cur_state == ZFPM_STATE_ACTIVE
|| cur_state == ZFPM_STATE_CONNECTING);
assert(zfpm_g->sock);
assert(zfpm_g->t_read);
assert(zfpm_g->t_write);
break;
}
zfpm_g->state = state;
}
/*
* zfpm_calc_connect_delay
*
* Returns the number of seconds after which we should attempt to
* reconnect to the FPM.
*/
static long zfpm_calc_connect_delay(void)
{
time_t elapsed;
/*
* Return 0 if this is our first attempt to connect.
*/
if (zfpm_g->connect_calls == 0) {
return 0;
}
elapsed = zfpm_get_elapsed_time(zfpm_g->last_connect_call_time);
if (elapsed > ZFPM_CONNECT_RETRY_IVL) {
return 0;
}
return ZFPM_CONNECT_RETRY_IVL - elapsed;
}
/*
* zfpm_start_connect_timer
*/
static void zfpm_start_connect_timer(const char *reason)
{
long delay_secs;
assert(!zfpm_g->t_connect);
assert(zfpm_g->sock < 0);
assert(zfpm_g->state == ZFPM_STATE_IDLE
|| zfpm_g->state == ZFPM_STATE_ACTIVE
|| zfpm_g->state == ZFPM_STATE_CONNECTING);
delay_secs = zfpm_calc_connect_delay();
zfpm_debug("scheduling connect in %ld seconds", delay_secs);
thread_add_timer(zfpm_g->master, zfpm_connect_cb, 0, delay_secs,
&zfpm_g->t_connect);
zfpm_set_state(ZFPM_STATE_ACTIVE, reason);
}
/*
* zfpm_is_enabled
*
* Returns TRUE if the zebra FPM module has been enabled.
*/
static inline int zfpm_is_enabled(void)
{
return zfpm_g->enabled;
}
/*
* zfpm_conn_is_up
*
* Returns TRUE if the connection to the FPM is up.
*/
static inline int zfpm_conn_is_up(void)
{
if (zfpm_g->state != ZFPM_STATE_ESTABLISHED)
return 0;
assert(zfpm_g->sock >= 0);
return 1;
}
/*
* zfpm_trigger_update
*
* The zebra code invokes this function to indicate that we should
* send an update to the FPM about the given route_node.
*/
static int zfpm_trigger_update(struct route_node *rn, const char *reason)
{
rib_dest_t *dest;
char buf[PREFIX_STRLEN];
/*
* Ignore if the connection is down. We will update the FPM about
* all destinations once the connection comes up.
*/
if (!zfpm_conn_is_up())
return 0;
dest = rib_dest_from_rnode(rn);
if (CHECK_FLAG(dest->flags, RIB_DEST_UPDATE_FPM)) {
zfpm_g->stats.redundant_triggers++;
return 0;
}
if (reason) {
zfpm_debug("%s triggering update to FPM - Reason: %s",
prefix2str(&rn->p, buf, sizeof(buf)), reason);
}
SET_FLAG(dest->flags, RIB_DEST_UPDATE_FPM);
TAILQ_INSERT_TAIL(&zfpm_g->dest_q, dest, fpm_q_entries);
zfpm_g->stats.updates_triggered++;
/*
* Make sure that writes are enabled.
*/
if (zfpm_g->t_write)
return 0;
zfpm_write_on();
return 0;
}
/*
* zfpm_stats_timer_cb
*/
static int zfpm_stats_timer_cb(struct thread *t)
{
zfpm_g->t_stats = NULL;
/*
* Remember the stats collected in the last interval for display
* purposes.
*/
zfpm_stats_copy(&zfpm_g->stats, &zfpm_g->last_ivl_stats);
/*
* Add the current set of stats into the cumulative statistics.
*/
zfpm_stats_compose(&zfpm_g->cumulative_stats, &zfpm_g->stats,
&zfpm_g->cumulative_stats);
/*
* Start collecting stats afresh over the next interval.
*/
zfpm_stats_reset(&zfpm_g->stats);
zfpm_start_stats_timer();
return 0;
}
/*
* zfpm_stop_stats_timer
*/
static void zfpm_stop_stats_timer(void)
{
if (!zfpm_g->t_stats)
return;
zfpm_debug("Stopping existing stats timer");
THREAD_TIMER_OFF(zfpm_g->t_stats);
}
/*
* zfpm_start_stats_timer
*/
void zfpm_start_stats_timer(void)
{
assert(!zfpm_g->t_stats);
thread_add_timer(zfpm_g->master, zfpm_stats_timer_cb, 0,
ZFPM_STATS_IVL_SECS, &zfpm_g->t_stats);
}
/*
* Helper macro for zfpm_show_stats() below.
*/
#define ZFPM_SHOW_STAT(counter) \
do { \
vty_out(vty, "%-40s %10lu %16lu\n", #counter, \
total_stats.counter, zfpm_g->last_ivl_stats.counter); \
} while (0)
/*
* zfpm_show_stats
*/
static void zfpm_show_stats(struct vty *vty)
{
zfpm_stats_t total_stats;
time_t elapsed;
vty_out(vty, "\n%-40s %10s Last %2d secs\n\n", "Counter", "Total",
ZFPM_STATS_IVL_SECS);
/*
* Compute the total stats up to this instant.
*/
zfpm_stats_compose(&zfpm_g->cumulative_stats, &zfpm_g->stats,
&total_stats);
ZFPM_SHOW_STAT(connect_calls);
ZFPM_SHOW_STAT(connect_no_sock);
ZFPM_SHOW_STAT(read_cb_calls);
ZFPM_SHOW_STAT(write_cb_calls);
ZFPM_SHOW_STAT(write_calls);
ZFPM_SHOW_STAT(partial_writes);
ZFPM_SHOW_STAT(max_writes_hit);
ZFPM_SHOW_STAT(t_write_yields);
ZFPM_SHOW_STAT(nop_deletes_skipped);
ZFPM_SHOW_STAT(route_adds);
ZFPM_SHOW_STAT(route_dels);
ZFPM_SHOW_STAT(updates_triggered);
ZFPM_SHOW_STAT(redundant_triggers);
ZFPM_SHOW_STAT(dests_del_after_update);
ZFPM_SHOW_STAT(t_conn_down_starts);
ZFPM_SHOW_STAT(t_conn_down_dests_processed);
ZFPM_SHOW_STAT(t_conn_down_yields);
ZFPM_SHOW_STAT(t_conn_down_finishes);
ZFPM_SHOW_STAT(t_conn_up_starts);
ZFPM_SHOW_STAT(t_conn_up_dests_processed);
ZFPM_SHOW_STAT(t_conn_up_yields);
ZFPM_SHOW_STAT(t_conn_up_aborts);
ZFPM_SHOW_STAT(t_conn_up_finishes);
if (!zfpm_g->last_stats_clear_time)
return;
elapsed = zfpm_get_elapsed_time(zfpm_g->last_stats_clear_time);
vty_out(vty, "\nStats were cleared %lu seconds ago\n",
(unsigned long)elapsed);
}
/*
* zfpm_clear_stats
*/
static void zfpm_clear_stats(struct vty *vty)
{
if (!zfpm_is_enabled()) {
vty_out(vty, "The FPM module is not enabled...\n");
return;
}
zfpm_stats_reset(&zfpm_g->stats);
zfpm_stats_reset(&zfpm_g->last_ivl_stats);
zfpm_stats_reset(&zfpm_g->cumulative_stats);
zfpm_stop_stats_timer();
zfpm_start_stats_timer();
zfpm_g->last_stats_clear_time = monotime(NULL);
vty_out(vty, "Cleared FPM stats\n");
}
/*
* show_zebra_fpm_stats
*/
DEFUN (show_zebra_fpm_stats,
show_zebra_fpm_stats_cmd,
"show zebra fpm stats",
SHOW_STR
ZEBRA_STR
"Forwarding Path Manager information\n"
"Statistics\n")
{
zfpm_show_stats(vty);
return CMD_SUCCESS;
}
/*
* clear_zebra_fpm_stats
*/
DEFUN (clear_zebra_fpm_stats,
clear_zebra_fpm_stats_cmd,
"clear zebra fpm stats",
CLEAR_STR
ZEBRA_STR
"Clear Forwarding Path Manager information\n"
"Statistics\n")
{
zfpm_clear_stats(vty);
return CMD_SUCCESS;
}
/*
* update fpm connection information
*/
DEFUN ( fpm_remote_ip,
fpm_remote_ip_cmd,
"fpm connection ip A.B.C.D port (1-65535)",
"fpm connection remote ip and port\n"
"Remote fpm server ip A.B.C.D\n"
"Enter ip ")
{
in_addr_t fpm_server;
uint32_t port_no;
fpm_server = inet_addr(argv[3]->arg);
if (fpm_server == INADDR_NONE)
return CMD_ERR_INCOMPLETE;
port_no = atoi(argv[5]->arg);
if (port_no < TCP_MIN_PORT || port_no > TCP_MAX_PORT)
return CMD_ERR_INCOMPLETE;
zfpm_g->fpm_server = fpm_server;
zfpm_g->fpm_port = port_no;
return CMD_SUCCESS;
}
DEFUN ( no_fpm_remote_ip,
no_fpm_remote_ip_cmd,
"no fpm connection ip A.B.C.D port (1-65535)",
"fpm connection remote ip and port\n"
"Connection\n"
"Remote fpm server ip A.B.C.D\n"
"Enter ip ")
{
if (zfpm_g->fpm_server != inet_addr(argv[4]->arg)
|| zfpm_g->fpm_port != atoi(argv[6]->arg))
return CMD_ERR_NO_MATCH;
zfpm_g->fpm_server = FPM_DEFAULT_IP;
zfpm_g->fpm_port = FPM_DEFAULT_PORT;
return CMD_SUCCESS;
}
/*
* zfpm_init_message_format
*/
static inline void zfpm_init_message_format(const char *format)
{
int have_netlink, have_protobuf;
#ifdef HAVE_NETLINK
have_netlink = 1;
#else
have_netlink = 0;
#endif
#ifdef HAVE_PROTOBUF
have_protobuf = 1;
#else
have_protobuf = 0;
#endif
zfpm_g->message_format = ZFPM_MSG_FORMAT_NONE;
if (!format) {
if (have_netlink) {
zfpm_g->message_format = ZFPM_MSG_FORMAT_NETLINK;
} else if (have_protobuf) {
zfpm_g->message_format = ZFPM_MSG_FORMAT_PROTOBUF;
}
return;
}
if (!strcmp("netlink", format)) {
if (!have_netlink) {
zlog_err("FPM netlink message format is not available");
return;
}
zfpm_g->message_format = ZFPM_MSG_FORMAT_NETLINK;
return;
}
if (!strcmp("protobuf", format)) {
if (!have_protobuf) {
zlog_err(
"FPM protobuf message format is not available");
return;
}
zfpm_g->message_format = ZFPM_MSG_FORMAT_PROTOBUF;
return;
}
zlog_warn("Unknown fpm format '%s'", format);
}
/**
* fpm_remote_srv_write
*
* Module to write remote fpm connection
*
* Returns ZERO on success.
*/
static int fpm_remote_srv_write(struct vty *vty)
{
struct in_addr in;
in.s_addr = zfpm_g->fpm_server;
if ((zfpm_g->fpm_server != FPM_DEFAULT_IP
&& zfpm_g->fpm_server != INADDR_ANY)
|| (zfpm_g->fpm_port != FPM_DEFAULT_PORT
&& zfpm_g->fpm_port != 0))
vty_out(vty, "fpm connection ip %s port %d\n", inet_ntoa(in),
zfpm_g->fpm_port);
return 0;
}
/* Zebra node */
static struct cmd_node zebra_node = {ZEBRA_NODE, "", 1};
/**
* zfpm_init
*
* One-time initialization of the Zebra FPM module.
*
* @param[in] port port at which FPM is running.
* @param[in] enable TRUE if the zebra FPM module should be enabled
* @param[in] format to use to talk to the FPM. Can be 'netink' or 'protobuf'.
*
* Returns TRUE on success.
*/
static int zfpm_init(struct thread_master *master)
{
int enable = 1;
uint16_t port = 0;
const char *format = THIS_MODULE->load_args;
memset(zfpm_g, 0, sizeof(*zfpm_g));
zfpm_g->master = master;
TAILQ_INIT(&zfpm_g->dest_q);
zfpm_g->sock = -1;
zfpm_g->state = ZFPM_STATE_IDLE;
zfpm_stats_init(&zfpm_g->stats);
zfpm_stats_init(&zfpm_g->last_ivl_stats);
zfpm_stats_init(&zfpm_g->cumulative_stats);
install_node(&zebra_node, fpm_remote_srv_write);
install_element(ENABLE_NODE, &show_zebra_fpm_stats_cmd);
install_element(ENABLE_NODE, &clear_zebra_fpm_stats_cmd);
install_element(CONFIG_NODE, &fpm_remote_ip_cmd);
install_element(CONFIG_NODE, &no_fpm_remote_ip_cmd);
zfpm_init_message_format(format);
/*
* Disable FPM interface if no suitable format is available.
*/
if (zfpm_g->message_format == ZFPM_MSG_FORMAT_NONE)
enable = 0;
zfpm_g->enabled = enable;
if (!zfpm_g->fpm_server)
zfpm_g->fpm_server = FPM_DEFAULT_IP;
if (!port)
port = FPM_DEFAULT_PORT;
zfpm_g->fpm_port = port;
zfpm_g->obuf = stream_new(ZFPM_OBUF_SIZE);
zfpm_g->ibuf = stream_new(ZFPM_IBUF_SIZE);
zfpm_start_stats_timer();
zfpm_start_connect_timer("initialized");
return 0;
}
static int zebra_fpm_module_init(void)
{
hook_register(rib_update, zfpm_trigger_update);
hook_register(frr_late_init, zfpm_init);
return 0;
}
FRR_MODULE_SETUP(.name = "zebra_fpm", .version = FRR_VERSION,
.description = "zebra FPM (Forwarding Plane Manager) module",
.init = zebra_fpm_module_init, )
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