// L2TPNS Clustering Stuff
-char const *cvs_id_cluster = "$Id: cluster.c,v 1.7 2004-07-07 09:09:53 bodea Exp $";
+char const *cvs_id_cluster = "$Id: cluster.c,v 1.9 2004-07-11 07:57:35 bodea Exp $";
#include <stdio.h>
#include <sys/file.h>
int uptodate;
} peers[CLUSTER_MAX_SIZE]; // List of all the peers we've heard from.
static int num_peers; // Number of peers in list.
-static int have_peers; // At least one up to date peer
int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize);
int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize);
static void send_heartbeat(int seq, char * data, int size)
{
int i;
- static int last_seq = -1;
-
- if (last_seq != -1 && (seq != (last_seq+1)%HB_MAX_SEQ) ) {
- log(0,0,0,0, "FATAL: Sequence number skipped! (%d != %d)\n",
- seq, last_seq);
- }
- last_seq = seq;
if (size > sizeof(past_hearts[0].data)) {
log(0,0,0,0, "Tried to heartbeat something larger than the maximum packet!\n");
return;
}
+//
+// On the master, check how our slaves are going. If
+// one of them's not up-to-date we'll heartbeat faster.
+// If we don't have any of them, then we need to turn
+// on our own packet handling!
+//
+void cluster_check_slaves(void)
+{
+ int i;
+ static int have_peers = 0;
+ int had_peers = have_peers;
+ clockt t = TIME;
+
+ if (!config->cluster_iam_master)
+ return; // Only runs on the master...
+
+ config->cluster_iam_uptodate = 1; // cleared in loop below
+
+ for (i = have_peers = 0; i < num_peers; i++)
+ {
+ if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
+ continue; // Stale peer! Skip them.
+
+ if (!peers[i].basetime)
+ continue; // Shutdown peer! Skip them.
+
+ if (peers[i].uptodate)
+ have_peers = 1;
+
+ if (!peers[i].uptodate)
+ config->cluster_iam_uptodate = 0; // Start fast heartbeats
+ }
+
+#ifdef BGP
+ // master lost all slaves, need to handle traffic ourself
+ if (bgp_configured && had_peers && !have_peers)
+ bgp_enable_routing(1);
+ else if (bgp_configured && !had_peers && have_peers)
+ bgp_enable_routing(0);
+#endif /* BGP */
+}
+
//
// Check that we have a master. If it's been too
// long since we heard from a master then hold an election.
{
int i, count, tcount, high_sid = 0;
int last_free = 0;
- int had_peers = have_peers;
clockt t = TIME;
static int probed = 0;
- if (TIME < (config->cluster_last_hb + config->cluster_hb_timeout))
- {
+ if (config->cluster_iam_master)
+ return; // Only runs on the slaves...
+
// 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
// which will hopefully respond with a unicast heartbeat that
// will allow us to limp along until the querier next runs.
- if (config->cluster_master_address
- && TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
+ if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
+ {
+ if (!probed && config->cluster_master_address)
{
- if (!probed)
- {
- probed = 1;
- log(1, 0, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
- TIME - (config->cluster_last_hb + config->cluster_hb_interval));
-
- peer_send_message(config->cluster_master_address,
- C_LASTSEEN, config->cluster_seq_number, NULL, 0);
- }
- } else { // We got a recent heartbeat; reset the probe flag.
- probed = 0;
- }
+ probed = 1;
+ log(1, 0, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
+ 0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
- if (!config->cluster_iam_master)
- return; // Everything's ok. return.
-
- // Master needs to check peer state
+ peer_send_message(config->cluster_master_address,
+ C_LASTSEEN, config->cluster_seq_number, NULL, 0);
+ }
+ } else { // We got a recent heartbeat; reset the probe flag.
+ probed = 0;
}
- config->cluster_last_hb = TIME + 1;
+ if (TIME < (config->cluster_last_hb + config->cluster_hb_timeout))
+ return; // Everything's ok!
- if (config->cluster_iam_master)
- config->cluster_iam_uptodate = 1; // cleared in loop below
- else
- log(0,0,0,0, "Master timed out! Holding election...\n");
+ config->cluster_last_hb = TIME + 1; // Just the one election thanks.
+ log(0,0,0,0, "Master timed out! Holding election...\n");
- for (i = have_peers = 0; i < num_peers; i++)
+ for (i = 0; i < num_peers; i++)
{
if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
continue; // Stale peer! Skip them.
if (!peers[i].basetime)
continue; // Shutdown peer! Skip them.
- if (peers[i].uptodate)
- have_peers = 1;
-
- if (config->cluster_iam_master)
- {
- if (!peers[i].uptodate)
- config->cluster_iam_uptodate = 0; // Start fast heartbeats
-
- continue;
- }
-
if (peers[i].basetime < basetime) {
log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) );
return; // They'll win the election. Get out of here.
}
}
- if (config->cluster_iam_master) // If we're the master, we've already won
- {
-#ifdef BGP
- // master lost all slaves, need to handle traffic ourself
- if (bgp_configured && had_peers && !have_peers)
- bgp_enable_routing(1);
-#endif /* BGP */
- return;
- }
-
// Wow. it's been ages since I last heard a heartbeat
// and I'm better than an of my peers so it's time
// to become a master!!!
log(0,0,0,0, "I am declaring myself the master!\n");
-#ifdef BGP
- if (bgp_configured && have_peers)
- bgp_enable_routing(0); /* stop handling traffic */
-#endif /* BGP */
-
if (config->cluster_seq_number == -1)
config->cluster_seq_number = 0;
while (seq != config->cluster_seq_number) {
s = seq%HB_HISTORY_SIZE;
if (seq != past_hearts[s].seq) {
- int i;
log(0,0,0,0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
inet_toa(slave), seq, past_hearts[s].seq, s, config->cluster_seq_number);
-
- for (i = 0; i < HB_HISTORY_SIZE; ++i) {
- log(0,0,0,0, "\tentry %3d: seq %d (size %d)\n", i, past_hearts[s].seq, past_hearts[s].size);
- }
return -1; // What to do here!?
}
peer_send_data(slave, past_hearts[s].data, past_hearts[s].size);
// We've heard from another peer! Add it to the list
// that we select from at election time.
//
-int cluster_add_peer(u32 peer, time_t basetime, pingt *p)
+int cluster_add_peer(u32 peer, time_t basetime, pingt *pp, int size)
{
int i;
u32 clusterid;
+ pingt p;
+
+
+ // Allow for backward compatability.
+ // Just the ping packet into a new structure to allow
+ // for the possibility that we might have received
+ // more or fewer elements than we were expecting.
+ if (size > sizeof(p))
+ size = sizeof(p);
+
+ memset( (void*) &p, 0, sizeof(p) );
+ memcpy( (void*) &p, (void*) pp, size);
+
- clusterid = p->addr;
+ clusterid = p.addr;
if (clusterid != config->bind_address)
{
// Is this for us?
// This peer already exists. Just update the timestamp.
peers[i].basetime = basetime;
peers[i].timestamp = TIME;
- peers[i].uptodate = !p->undef;
+ peers[i].uptodate = !p.undef;
break;
}
// Is this the master shutting down??
if (peer == config->cluster_master_address && !basetime) {
+ log(3,0,0,0, "Master %s shutting down...\n", inet_toa(config->cluster_master_address));
config->cluster_master_address = 0;
config->cluster_last_hb = 0; // Force an election.
cluster_check_master();
peers[i].peer = peer;
peers[i].basetime = basetime;
peers[i].timestamp = TIME;
- peers[i].uptodate = !p->undef;
+ peers[i].uptodate = !p.undef;
if (i == num_peers)
++num_peers;
log(1,0,0,0, "Added %s as a new peer. Now %d peers\n", inet_toa(peer), num_peers);
}
- if (peers[i].uptodate)
- {
-#ifdef BGP
- /* drop routes if we've now got a peer */
- if (config->cluster_iam_master && bgp_configured && !have_peers)
- bgp_enable_routing(0);
-#endif /* BGP */
- have_peers = 1;
- }
- else if (config->cluster_iam_master)
- {
- config->cluster_iam_uptodate = 0; // increase heart-rate...
- }
-
-
return 1;
}
switch (type) {
case C_PING: // Update the peers table.
- return cluster_add_peer(addr, more, (pingt*)p);
+ return cluster_add_peer(addr, more, (pingt*)p, s);
case C_LASTSEEN: // Catch up a slave (slave missed a packet).
return cluster_catchup_slave(more, addr);
projects / l2tpns.git / blobdiff