// L2TPNS Clustering Stuff
-char const *cvs_id_cluster = "$Id: cluster.c,v 1.26.2.8 2005/05/22 12:02:41 bodea Exp $";
+char const *cvs_id_cluster = "$Id: cluster.c,v 1.26.2.12 2005/07/03 02:58:06 bodea Exp $";
#include <stdio.h>
#include <stdlib.h>
}
// advertise our presence via BGP or gratuitous ARP
-static void advertise(void)
+static void advertise_routes(void)
{
#ifdef BGP
if (bgp_configured)
send_garp(config->bind_address); // Start taking traffic.
}
+// withdraw our routes (BGP only)
+static void withdraw_routes(void)
+{
+#ifdef BGP
+ if (bgp_configured)
+ bgp_enable_routing(0);
+#endif /* BGP */
+}
+
static void cluster_uptodate(void)
{
if (config->cluster_iam_uptodate)
config->cluster_iam_uptodate = 1;
LOG(0, 0, 0, "Now uptodate with master.\n");
- advertise();
+ advertise_routes();
}
//
}
//
-// Send an 'i am alive' message to every machine in the cluster, or to a single peer
+// Send an 'i am alive' message to every machine in the cluster.
//
-static void send_ping(time_t basetime, in_addr_t peer)
+void cluster_send_ping(time_t basetime)
{
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));
-
- 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);
+ cluster_send_data(buff, (p-buff) );
}
//
continue; // Shutdown peer! Skip them.
if (peers[i].uptodate)
- have_peers = 1;
-
- if (!peers[i].uptodate)
+ have_peers++;
+ else
config->cluster_iam_uptodate = 0; // Start fast heartbeats
}
-#ifdef BGP
- // in a cluster, withdraw/add routes when we get a peer/lose all peers
- if (bgp_configured && have_peers != had_peers)
- bgp_enable_routing(!have_peers);
-#endif /* BGP */
+ // in a cluster, withdraw/add routes when we get a peer/lose peers
+ if (have_peers != had_peers)
+ {
+ if (had_peers < config->cluster_master_min_adv &&
+ have_peers >= config->cluster_master_min_adv)
+ withdraw_routes();
+
+ else if (had_peers >= config->cluster_master_min_adv &&
+ have_peers < config->cluster_master_min_adv)
+ advertise_routes();
+ }
}
//
int last_free = 0;
clockt t = TIME;
static int probed = 0;
+ int have_peers;
if (config->cluster_iam_master)
return; // Only runs on the slaves...
return; // Everything's ok!
config->cluster_last_hb = TIME + 1; // Just the one election thanks.
+ config->cluster_master_address = 0;
LOG(0, 0, 0, "Master timed out! Holding election...\n");
- for (i = 0; i < num_peers; i++)
+ // In the process of shutting down, can't be master
+ if (main_quit)
+ return;
+
+ for (i = have_peers = 0; i < num_peers; i++)
{
if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
continue; // Stale peer! Skip them.
LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers[i].peer, 0));
return; // They'll win the election. Wait for them to come up.
}
+
+ if (peers[i].uptodate)
+ have_peers++;
}
// Wow. it's been ages since I last heard a heartbeat
// to become a master!!!
config->cluster_iam_master = 1;
- config->cluster_master_address = 0;
LOG(0, 0, 0, "I am declaring myself the master!\n");
+ if (have_peers < config->cluster_master_min_adv)
+ advertise_routes();
+ else
+ withdraw_routes();
+
if (config->cluster_seq_number == -1)
config->cluster_seq_number = 0;
config->cluster_undefined_tunnels = 0;
config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
- 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
// should also update.
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);
+ LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n",
+ fmtaddr(config->cluster_master_address, 0));
+
+ peer_send_message(slave, C_MASTER, config->cluster_master_address, NULL, 0);
return 0;
}
return 1;
}
+// A slave responds with C_MASTER when it gets a message which should have gone to a master.
+static int cluster_set_master(in_addr_t peer, in_addr_t master)
+{
+ if (config->cluster_iam_master) // Sanity...
+ return 0;
+
+ LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer, 0),
+ fmtaddr(master, 1));
+
+ config->cluster_master_address = master;
+ cluster_check_master();
+ return 0;
+}
+
/* Handle the slave updating the byte counters for the master. */
//
// Note that we don't mark the session as dirty; We rely on
// 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) {
+ if (config->cluster_master_address && addr != config->cluster_master_address) {
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));
s -= sizeof(uint32_t);
switch (type) {
- case C_PING: // Update the peers table.
+ case C_PING: // Update the peers table.
return cluster_add_peer(addr, more, (pingt *) p, s);
- case C_LASTSEEN: // Catch up a slave (slave missed a packet).
+ case C_MASTER: // Our master is wrong
+ return cluster_set_master(addr, more);
+
+ case C_LASTSEEN: // Catch up a slave (slave missed a packet).
return cluster_catchup_slave(more, addr);
case C_FORWARD: { // Forwarded control packet. pass off to processudp.
return 0;
case C_BYTES:
+ if (!config->cluster_iam_master) {
+ LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr, 0));
+ return -1;
+ }
+
return cluster_handle_bytes(p, s);
case C_KILL: // The master asked us to die!? (usually because we're too out of date).
projects / l2tpns.git / blobdiff