// L2TPNS Clustering Stuff
-char const *cvs_id_cluster = "$Id: cluster.c,v 1.25 2004/12/16 08:49:53 bodea Exp $";
+char const *cvs_id_cluster = "$Id: cluster.c,v 1.26.2.8 2005/05/22 12:02:41 bodea Exp $";
#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <inttypes.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <string.h>
#include <malloc.h>
#include <errno.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <stdio.h>
#include <libcli.h>
-#include <inttypes.h>
#include "l2tpns.h"
#include "cluster.h"
static struct {
in_addr_t peer;
- time_t basetime;
+ uint32_t basetime;
clockt timestamp;
int uptodate;
} peers[CLUSTER_MAX_SIZE]; // List of all the peers we've heard from.
}
//
-// Send an 'i am alive' message to every machine in the cluster.
+// Send an 'i am alive' message to every machine in the cluster, or to a single peer
//
-void cluster_send_ping(time_t basetime)
+static void send_ping(time_t basetime, in_addr_t peer)
{
char buff[100 + sizeof(pingt)];
char *p = buff;
if (config->cluster_iam_master && basetime) // We're heartbeating so no need to ping.
return;
- LOG(5, 0, 0, "Sending cluster ping...\n");
-
x.ver = 1;
x.addr = config->bind_address;
x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels;
x.basetime = basetime;
add_type(&p, C_PING, basetime, (char *) &x, sizeof(x));
- cluster_send_data(buff, (p-buff) );
+
+ if (peer)
+ peer_send_data(peer, buff, (p-buff));
+ else
+ cluster_send_data(buff, (p-buff) );
+}
+
+void cluster_send_ping(time_t basetime)
+{
+ LOG(5, 0, 0, "Sending cluster ping...\n");
+ send_ping(0, basetime);
+}
+
+static void peer_send_ping(in_addr_t peer, time_t basetime)
+{
+ LOG(5, 0, 0, "Sending unicast ping to %s...\n", fmtaddr(peer, 0));
+ send_ping(peer, basetime);
}
//
if ( walk_session_number > config->cluster_highest_sessionid)
walk_session_number = 1;
- if (!sess_count[walk_session_number].cin && !sess_count[walk_session_number].cout)
+ if (!sess_local[walk_session_number].cin && !sess_local[walk_session_number].cout)
continue; // Unused. Skip it.
b[c].sid = walk_session_number;
- b[c].in = sess_count[walk_session_number].cin;
- b[c].out = sess_count[walk_session_number].cout;
+ b[c].in = sess_local[walk_session_number].cin;
+ b[c].out = sess_local[walk_session_number].cout;
if (++c > MAX_B_RECS) // Send a max of 400 elements in a packet.
break;
// Reset counters.
- sess_count[walk_session_number].cin = sess_count[walk_session_number].cout = 0;
+ sess_local[walk_session_number].cin = sess_local[walk_session_number].cout = 0;
}
if (!c) // Didn't find any that changes. Get out of here!
// If the master is late (missed 2 hearbeats by a second and a
// hair) it may be that the switch has dropped us from the
- // multicast group, try unicasting one probe to the master
+ // multicast group, try unicasting probes to the master
// which will hopefully respond with a unicast heartbeat that
// will allow us to limp along until the querier next runs.
- if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
+ if (config->cluster_master_address
+ && TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
{
- if (!probed && config->cluster_master_address)
+ if (!probed || (TIME > (probed + 2 * config->cluster_hb_interval)))
{
- probed = 1;
+ probed = TIME;
LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
++count;
}
- if (session[i].tunnel == T_FREE) { // Unused session. Add to free list.
+ if (!session[i].opened) { // Unused session. Add to free list.
+ memset(&session[i], 0, sizeof(session[i]));
+ session[i].tunnel = T_FREE;
session[last_free].next = i;
session[i].next = 0;
last_free = i;
+ continue;
}
- // Reset all the idle timeouts..
+ // Reset idle timeouts..
session[i].last_packet = time_now;
+ // Reset die relative to our uptime rather than the old master's
+ if (session[i].die) session[i].die = TIME;
+
// Accumulate un-sent byte counters.
- session[i].cin += sess_count[i].cin;
- session[i].cout += sess_count[i].cout;
- session[i].total_cin += sess_count[i].cin;
- session[i].total_cout += sess_count[i].cout;
+ session[i].cin += sess_local[i].cin;
+ session[i].cout += sess_local[i].cout;
+ session[i].total_cin += sess_local[i].cin;
+ session[i].total_cout += sess_local[i].cout;
- sess_count[i].cin = sess_count[i].cout = 0;
+ sess_local[i].cin = sess_local[i].cout = 0;
session[i].radius = 0; // Reset authentication as the radius blocks aren't up to date.
if (session[i].unique_id >= high_unique_id) // This is different to the index into the session table!!!
high_unique_id = session[i].unique_id+1;
-
session[i].tbf_in = session[i].tbf_out = 0; // Remove stale pointers from old master.
throttle_session(i, session[i].throttle_in, session[i].throttle_out);
- if (session[i].tunnel != T_FREE && i > config->cluster_highest_sessionid)
- config->cluster_highest_sessionid = i;
+ config->cluster_highest_sessionid = i;
}
session[last_free].next = 0; // End of chain.
- last_id = high_unique_id; // Keep track of the highest used session ID.
+ last_id = high_unique_id; // Keep track of the highest used session ID.
become_master();
if (!num_peers) // lone master
advertise();
+#ifdef BGP
+ else if (bgp_configured)
+ bgp_enable_routing(0);
+#endif /* BGP */
+
// FIXME. We need to fix up the tunnel control message
// queue here! There's a number of other variables we
config->cluster_undefined_sessions = 0;
for (i = 1 ; i < MAXSESSION; ++i) {
if (i > highsession) {
- session[i].tunnel = 0; // Defined.
+ if (session[i].tunnel == T_UNDEF) session[i].tunnel = T_FREE; // Defined.
continue;
}
- if (session[i].tunnel != T_UNDEF)
- continue;
- ++config->cluster_undefined_sessions;
+
+ if (session[i].tunnel == T_UNDEF)
+ ++config->cluster_undefined_sessions;
}
// Clear out defined tunnels, counting the number of
config->cluster_undefined_tunnels = 0;
for (i = 1 ; i < MAXTUNNEL; ++i) {
if (i > hightunnel) {
- tunnel[i].state = TUNNELFREE; // Defined.
+ if (tunnel[i].state == TUNNELUNDEF) tunnel[i].state = TUNNELFREE; // Defined.
continue;
}
- if (tunnel[i].state != TUNNELUNDEF)
- continue;
- ++config->cluster_undefined_tunnels;
+
+ if (tunnel[i].state == TUNNELUNDEF)
+ ++config->cluster_undefined_tunnels;
}
int diff;
LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave, 0), seq);
+ if (!config->cluster_iam_master) {
+ LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Sending a PING.\n");
+ // Send a ping to the slave so they know we're no longer a master
+ peer_send_ping(slave, basetime);
+ return 0;
+ }
diff = config->cluster_seq_number - seq; // How many packet do we need to send?
if (diff < 0)
return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do.
}
+ LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff, fmtaddr(slave, 0) );
+
// Now resend every packet that it missed, in order.
while (seq != config->cluster_seq_number) {
- s = seq%HB_HISTORY_SIZE;
+ s = seq % HB_HISTORY_SIZE;
if (seq != past_hearts[s].seq) {
LOG(0, 0, 0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
fmtaddr(slave, 0), seq, past_hearts[s].seq, s, config->cluster_seq_number);
}
// Is this the master shutting down??
- if (peer == config->cluster_master_address && !basetime) {
- LOG(3, 0, 0, "Master %s shutting down...\n", fmtaddr(config->cluster_master_address, 0));
+ if (peer == config->cluster_master_address) {
+ LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config->cluster_master_address, 0),
+ basetime ? "has restarted!" : "shutting down...");
+
config->cluster_master_address = 0;
config->cluster_last_hb = 0; // Force an election.
cluster_check_master();
session[b->sid].cin += b->in;
session[b->sid].cout += b->out;
- session[b->sid].last_packet = time_now; // Reset idle timer!
+
+ if (b->in)
+ session[b->sid].last_packet = time_now; // Reset idle timer!
size -= sizeof(*b);
++b;
exit(1);
}
+ //
+ // Send it a unicast heartbeat to see give it a chance to die.
+ // NOTE: It's actually safe to do seq-number - 1 without checking
+ // for wrap around.
+ //
+ cluster_catchup_slave(config->cluster_seq_number - 1, addr);
+
return -1; // Skip it.
}
+ //
+ // Try and guard against a stray master appearing.
+ //
+ // Ignore heartbeats received from another master before the
+ // timeout (less a smidgen) for the old master has elapsed.
+ //
+ // Note that after a clean failover, the cluster_master_address
+ // is cleared, so this doesn't run.
+ //
+ if (config->cluster_master_address && addr != config->cluster_master_address
+ && (config->cluster_last_hb + config->cluster_hb_timeout - 11) > TIME) {
+ LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n",
+ fmtaddr(addr, 0), fmtaddr(config->cluster_master_address, 1),
+ 0.1 * (TIME - config->cluster_last_hb));
+ return -1; // ignore
+ }
+
if (config->cluster_seq_number == -1) // Don't have one. Just align to the master...
config->cluster_seq_number = h->seq;
config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!!
if (config->cluster_seq_number != h->seq) { // Out of sequence heartbeat!
- LOG(1, 0, 0, "HB: Got seq# %d but was expecting %d. asking for resend.\n", h->seq, config->cluster_seq_number);
+ static int lastseen_seq = 0;
+ static time_t lastseen_time = 0;
+
+ // limit to once per second for a particular seq#
+ int ask = (config->cluster_seq_number != lastseen_seq || time_now != lastseen_time);
- peer_send_message(addr, C_LASTSEEN, config->cluster_seq_number, NULL, 0);
+ LOG(1, 0, 0, "HB: Got seq# %d but was expecting %d. %s.\n",
+ h->seq, config->cluster_seq_number,
+ ask ? "Asking for resend" : "Ignoring");
+
+ if (ask)
+ {
+ lastseen_seq = config->cluster_seq_number;
+ lastseen_time = time_now;
+ peer_send_message(addr, C_LASTSEEN, config->cluster_seq_number, NULL, 0);
+ }
config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!!
: "Not defined",
0.1 * (TIME - config->cluster_last_hb));
cli_print(cli, "Uptodate : %s", config->cluster_iam_uptodate ? "Yes" : "No");
- cli_print(cli, "Table version # : %llu", config->cluster_table_version);
+ cli_print(cli, "Table version # : %" PRIu64, config->cluster_table_version);
cli_print(cli, "Next sequence number expected: %d", config->cluster_seq_number);
cli_print(cli, "%d sessions undefined of %d", config->cluster_undefined_sessions, config->cluster_highest_sessionid);
cli_print(cli, "%d tunnels undefined of %d", config->cluster_undefined_tunnels, config->cluster_highest_tunnelid);
} else {
- cli_print(cli, "Table version # : %llu", config->cluster_table_version);
+ cli_print(cli, "Table version # : %" PRIu64, config->cluster_table_version);
cli_print(cli, "Next heartbeat # : %d", config->cluster_seq_number);
cli_print(cli, "Highest session : %d", config->cluster_highest_sessionid);
cli_print(cli, "Highest tunnel : %d", config->cluster_highest_tunnelid);
if (num_peers)
cli_print(cli, "%20s %10s %8s", "Address", "Basetime", "Age");
for (i = 0; i < num_peers; ++i) {
- cli_print(cli, "%20s %10d %8d", fmtaddr(peers[i].peer, 0),
+ cli_print(cli, "%20s %10u %8d", fmtaddr(peers[i].peer, 0),
peers[i].basetime, TIME - peers[i].timestamp);
}
return CLI_OK;
projects / l2tpns.git / blobdiff