// L2TPNS Clustering Stuff
-char const *cvs_id_cluster = "$Id: cluster.c,v 1.5 2004/07/02 07:30:43 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>
static int walk_session_number = 0; // The next session to send when doing the slow table walk.
static int walk_tunnel_number = 0; // The next tunnel to send when doing the slow table walk.
-static int hsess, fsess; // Saved copies of the highest used session id, and the first free one.
-
#define MAX_HEART_SIZE (8192) // Maximum size of heartbeat packet. Must be less than max IP packet size :)
#define MAX_CHANGES (MAX_HEART_SIZE/(sizeof(sessiont) + sizeof(int) ) - 2) // Assumes a session is the biggest type!
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 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);
if (!*config->cluster_interface)
return 0;
- cluster_sockfd = socket(AF_INET, SOCK_DGRAM, UDP);
+ cluster_sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(CLUSTERPORT);
addr.sin_family = AF_INET;
-// log_hex(4, "Cluster send", data, datalen); // VERY big data packets. How about we don't..
-
log(5,0,0,0, "Cluster send data: %d bytes\n", datalen);
if (sendto(cluster_sockfd, data, datalen, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0)
log(0,0,0,0, "Now uptodate with master.\n");
- // If we're not a master, or if we have no slaves
- // then start taking traffic..
- if (!config->cluster_iam_master || !have_peers)
- {
#ifdef BGP
- if (bgp_configured)
- bgp_enable_routing(1);
- else
+ if (bgp_configured)
+ bgp_enable_routing(1);
+ else
#endif /* BGP */
- if (config->send_garp)
- send_garp(config->bind_address); // Start taking traffic.
- }
+ if (config->send_garp)
+ send_garp(config->bind_address); // Start taking traffic.
}
//
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) )
- return; // Everything's ok. return.
+ if (config->cluster_iam_master)
+ return; // Only runs on the slaves...
- if (!config->cluster_iam_master)
- log(0,0,0,0, "Master timed out! Holding election...\n");
+ // 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 (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
+ {
+ if (!probed && config->cluster_master_address)
+ {
+ 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)));
+
+ 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!
- for (i = have_peers = 0; i < num_peers ; ++i) {
+ config->cluster_last_hb = TIME + 1; // Just the one election thanks.
+
+ log(0,0,0,0, "Master timed out! Holding election...\n");
+
+ 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.
- have_peers = 1;
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;
config->cluster_undefined_sessions = 0;
config->cluster_undefined_tunnels = 0;
+ config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
- //
- // FIXME. We need to fix up the tunnel control message
- // queue here! There's a number of other variables we
- // should also update.
- cluster_uptodate();
+ // FIXME. We need to fix up the tunnel control message
+ // queue here! There's a number of other variables we
+ // should also update.
}
default:
log(0,0,0,0, "Found an invalid type in heart queue! (%d)\n", type);
kill(0, SIGTERM);
+ exit(1);
}
return 0;
}
//
// Send a heartbeat, incidently sending out any queued changes..
//
-void cluster_heartbeat(int highsession, int freesession, int hightunnel)
+void cluster_heartbeat()
{
int i, count = 0, tcount = 0;
char buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ];
heartt h;
- char * p = buff;
+ char *p = buff;
if (!config->cluster_iam_master) // Only the master does this.
return;
- hsess = highsession;
- fsess = freesession;
- // Fill out the heartbeat header.
+ // Fill out the heartbeat header.
+ memset(&h, 0, sizeof(h));
+
h.version = HB_VERSION;
h.seq = config->cluster_seq_number;
h.basetime = basetime;
h.clusterid = config->bind_address; // Will this do??
h.basetime = basetime;
- h.highsession = highsession;
- h.freesession = freesession;
- h.hightunnel = hightunnel;
+ h.highsession = config->cluster_highest_sessionid;
+ h.freesession = sessionfree;
+ h.hightunnel = config->cluster_highest_tunnelid;
h.size_sess = sizeof(sessiont); // Just in case.
h.size_tunn = sizeof(tunnelt);
+ h.interval = config->cluster_hb_interval;
+ h.timeout = config->cluster_hb_timeout;
- add_type(&p, C_HEARTBEAT, HB_VERSION, (char*) &h, sizeof(h) );
+ add_type(&p, C_HEARTBEAT, HB_VERSION, (char*) &h, sizeof(h));
for (i = 0; i < config->cluster_num_changes; ++i) {
hb_add_type(&p, cluster_changes[i].type, cluster_changes[i].id);
if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer?
log(0,0,0,0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", p - buff);
kill(0, SIGTERM);
+ exit(1);
}
//
if (!walk_session_number) // session #0 isn't valid.
++walk_session_number;
- if (count >= highsession) // If we're a small cluster, don't go wild.
+ if (count >= config->cluster_highest_sessionid) // If we're a small cluster, don't go wild.
break;
hb_add_type(&p, C_CSESSION, walk_session_number);
- walk_session_number = (1+walk_session_number)%(highsession+1); // +1 avoids divide by zero.
+ walk_session_number = (1+walk_session_number)%(config->cluster_highest_sessionid+1); // +1 avoids divide by zero.
++count; // Count the number of extra sessions we're sending.
}
if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer?
log(0,0,0,0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", p - buff);
kill(0, SIGTERM);
+ exit(1);
}
log(3,0,0,0, "Sending heartbeat #%d with %d changes (%d x-sess, %d x-tunnels, %d highsess, %d hightun size %d)\n",
++config->cluster_num_changes;
if (config->cluster_num_changes > MAX_CHANGES)
- cluster_heartbeat(config->cluster_highest_sessionid, fsess, config->cluster_highest_tunnelid);
+ cluster_heartbeat(); // flush now
return 1;
}
// 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);
- clusterid = p->addr;
+ memset( (void*) &p, 0, sizeof(p) );
+ memcpy( (void*) &p, (void*) pp, size);
+
+
+ clusterid = p.addr;
if (clusterid != config->bind_address)
{
// Is this for us?
return 0;
}
- // Is this the master shutting down??
- if (peer == config->cluster_master_address && !basetime) {
- config->cluster_master_address = 0;
- config->cluster_last_hb = 0; // Force an election.
- cluster_check_master();
- return 0;
- }
-
for (i = 0; i < num_peers ; ++i)
{
if (peers[i].peer != peer)
// This peer already exists. Just update the timestamp.
peers[i].basetime = basetime;
peers[i].timestamp = TIME;
+ 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();
+ return 0;
+ }
+
if (i >= num_peers)
{
log(4,0,0,0, "Adding %s as a peer\n", inet_toa(peer));
// Not found. Is there a stale slot to re-use?
for (i = 0; i < num_peers ; ++i)
{
- if (peers[i].peer != peer)
- continue;
+ if (!peers[i].basetime) // Shutdown
+ break;
+
if ((peers[i].timestamp + config->cluster_hb_timeout * 10) < TIME) // Stale.
break;
}
peers[i].peer = peer;
peers[i].basetime = basetime;
peers[i].timestamp = TIME;
+ 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);
}
-#ifdef BGP
- /* drop routes if we've now got a peer */
- if (bgp_configured && config->cluster_iam_master && !have_peers)
- bgp_enable_routing(0);
-#endif /* BGP */
-
- have_peers = 1;
-
return 1;
}
if (!config->cluster_iam_uptodate)
cluster_uptodate(); // Check to see if we're up to date.
+
return 0;
}
//
-// Process a version one heartbeat..
+// Process a heartbeat..
//
-static int cluster_process_heartbeat_v2(u8 * data, int size, int more, u8 * p, u32 addr)
+static int cluster_process_heartbeat(u8 * data, int size, int more, u8 * p, u32 addr)
{
heartt * h;
int s = size - (p-data);
int i, type;
- if (more != HB_VERSION) {
- log(0,0,0,0, "Received a heartbeat version that I don't understand!\n");
+#if HB_VERSION != 3
+# error "need to update cluster_process_heartbeat()"
+#endif
+
+ // we handle version 2+
+ if (more < 2 || more > HB_VERSION) {
+ log(0,0,0,0, "Received a heartbeat version that I don't support (%d)!\n", more);
return -1; // Ignore it??
}
+
// Ok. It's a heartbeat packet from a cluster master!
if (s < sizeof(*h))
goto shortpacket;
-
h = (heartt*) p;
p += sizeof(*h);
s -= sizeof(*h);
// that the free session pointer is correct.
cluster_check_sessions(h->highsession, h->freesession, h->hightunnel);
+ if (more > 2) // reserved section of heartt was not initialized prior to v3
+ {
+ if (h->interval != config->cluster_hb_interval)
+ {
+ log(2, 0, 0, 0, "Master set ping/heartbeat interval to %u (was %u)\n",
+ h->interval, config->cluster_hb_interval);
+
+ config->cluster_hb_interval = h->interval;
+ }
+
+ if (h->timeout != config->cluster_hb_timeout)
+ {
+ log(2, 0, 0, 0, "Master set heartbeat timeout to %u (was %u)\n",
+ h->timeout, config->cluster_hb_timeout);
+
+ config->cluster_hb_timeout = h->timeout;
+ }
+ }
+
// Ok. process the packet...
while ( s > 0) {
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);
case C_HEARTBEAT:
log(4,0,0,0, "Got a heartbeat from %s\n", inet_toa(addr));
-
- return cluster_process_heartbeat_v2(data, size, more, p, addr);
+ return cluster_process_heartbeat(data, size, more, p, addr);
default:
log(0,0,0,0, "Strange type packet received on cluster socket (%d)\n", type);
return -1;
}
return 0;
+
shortpacket:
log(0,0,0,0, "I got an cluster heartbeat packet! This means I'm probably out of sync!!\n");
return -1;
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