* Wed Jun 23 2004 David Parrish <david@dparrish.com> 2.0.0

- Major release
- Completely replace active/standby clustering with a new peer-to-peer
  clustering method which allows much greater throughput and is a lot more fault
  tolerant
- Add internal tbf implementation for throttling without relying on tc and
  kernel HTB
- Add support for iBGP and eBGP to advertise routes
- Add cli commands "show cluster", "show bgp", "show ipcache", "show throttle",
  "show tbf", "suspend bgp", "restart bgp", "show user"
- Interception destination must be set per-user
- If SMP machine, allow use of SCHED_FIFO, which should improve performance
- Added config option to send GARP at startup
- Added plugin_become_master and plugin_new_session_master plugin hooks
- Remove useless sessionsendarp(). This isn't needed now that we are using TUN
  instead of TAP.
- ICMP rate limiting so not every unreachable packet is replied with an ICMP
  unreachable message
- mangle table is not required on anything but the cluster master, so slaves
  will drop the mangle table and attempt to unload the ip_conntrack module
- Statically assigned IP addresses (by Radius) work now
- Add -d command-line flag to detach and become a daemon
- Configuration file is now "/etc/l2tpns/startup-config"
- Reduced MIN_IP_SIZE to 0x19 to stop a pile of Short IP warnings
- Resend initial IPCP request until it's acknowleged by the client
- Better radius session cleanup logic
- Many miscellaenous bugfixes and performance enhancements
- Thanks to Michael O'Reilly and Brendan O'Dea for most of these new features

cluster.h

@@ -1,19 +1,85 @@
 // L2TPNS Clustering Stuff
-// $Id: cluster.h,v 1.2 2004-03-05 00:09:03 fred_nerk Exp $
+// $Id: cluster.h,v 1.3 2004-06-23 03:52:24 fred_nerk Exp $
 
-#define C_HELLO			1
-#define C_HELLO_RESPONSE	2
+#ifndef __CLUSTER_H__
+#define __CLUSTER_H__
+
+
+#define C_HEARTBEAT		1
+#define C_ACK			2
 #define C_PING			3
-#define C_TUNNEL		4
-#define C_SESSION		5
+#define C_TUNNEL		4	// Tunnel structure.
+#define C_SESSION		5	// Session structure.
 #define C_GOODBYE		6
+#define C_LASTSEEN		7	// Tell master the last heartbeat that I handled.
+#define C_KILL			8	// Tell a slave to die.
+#define C_FORWARD		9	// Forwarded packet..
+#define C_BYTES                 10      // Update byte counters.
+#define C_THROTTLE		11	// A packet for the master to throttle. (The TBF tells direction).
+#define C_CSESSION		12	// Compressed session structure.
+#define C_CTUNNEL		13	// Compressed tunnel structure.
+#define C_GARDEN		14	// Gardened packet
+
+#define HB_VERSION		2	// Protocol version number..
+#define HB_MAX_SEQ		(1<<30)	// Maximum sequence number. (MUST BE A POWER OF 2!)
+#define HB_HISTORY_SIZE		64	// How many old heartbeats we remember?? (Must be a factor of HB_MAX_SEQ)
+
+#define PING_INTERVAL		5	// 0.5 seconds. Needs to be short to keep session tables fresh.
+#define HB_TIMEOUT		(15*2*PING_INTERVAL) // 15 seconds without heartbeat triggers an election..
 
 #define CLUSTERPORT		32792
-#define CLUSTERCLIENTPORT	32793
 #define UDP			17
 #define TIMEOUT			20
 #define IL			sizeof(int)
 
-int cluster_init(uint32_t bind_address, int server);
-int cluster_send_message(unsigned long ip_address, uint32_t vip, char type, void *data, int datalen);
-int processcluster(char *buf, int l);
+#define CLUSTER_MAX_SIZE	32	// No more than 32 machines in a cluster!
+
+#define DEFAULT_MCAST_ADDR	"239.192.13.13"		// Need an assigned number!
+#define DEFAULT_MCAST_INTERFACE	"eth0"
+
+typedef struct {
+	u32	version;	// protocol version.
+	u32	seq;		// Sequence number for this heatbeat.
+	u32	basetime;	// What time I started
+	u32	clusterid;	// Id for this cluster?
+
+	u32	highsession;	// Id of the highest in-use session.
+	u32	freesession;	// Id of the first free session.
+	u32	hightunnel;	// Id of the highest used tunnel.
+	u32	size_sess;	// Size of the session structure.
+
+	u32	size_tunn;	// size of the tunnel structure.
+
+	char reserved[128 - 9*sizeof(u32)];	// Pad out to 128 bytes.
+} heartt;
+
+typedef struct {		/* Used to update byte counters on the */
+				/* master. */
+	u32        sid;
+	u32        in;
+	u32        out;
+} bytest;
+
+typedef struct {
+	u32	addr;		//
+	u32	ver;		// version of structure.
+	u32	undef;		// Number of undefined structures. 0 if up-to-date.
+	u32	basetime;	// start time of this peer.
+} pingt;
+
+int cluster_init();
+int processcluster(char *buf, int size, u32 addr);
+int cluster_forward_packet(char *buf, int size, u32 addr);
+int cluster_send_session(int sid);
+int cluster_send_tunnel(int tid);
+int master_forward_packet(char * data, int size, u32 addr, int port);
+int master_throttle_packet(int tid, char * data, int size);
+int master_garden_packet(sessionidt s, char * data, int size);
+void master_update_counts(void);
+
+void cluster_send_ping(time_t basetime);
+void cluster_heartbeat(int highsession, int freesession, int hightunnel);
+void cluster_check_master(void);
+int show_cluster(struct cli_def *cli, char *command, char **argv, int argc);
+
+#endif /* __CLUSTER_H__ */