- Add l2tp_mtu configuration option, used to define MRU, MSS.

[l2tpns.git] / cluster.c

diff --git a/cluster.c b/cluster.c
index b4aa1d9..12e7c08 100644 (file)
--- a/cluster.c
+++ b/cluster.c
@@ -1,6 +1,6 @@
 // L2TPNS Clustering Stuff
 
 // L2TPNS Clustering Stuff
 

-char const *cvs_id_cluster = "$Id: cluster.c,v 1.38 2005-05-24 07:45:13 bodea Exp $";
+char const *cvs_id_cluster = "$Id: cluster.c,v 1.46 2005-09-02 23:59:56 bodea Exp $";

 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include <stdio.h>
 #include <stdlib.h>


@@ -38,7 +38,7 @@ char const *cvs_id_cluster = "$Id: cluster.c,v 1.38 2005-05-24 07:45:13 bodea Ex
  */
 
 // Module variables.
  */
 
 // Module variables.

-int cluster_sockfd = 0;                        // The filedescriptor for the cluster communications port.
+extern int cluster_sockfd;             // The filedescriptor for the cluster communications port.

 
 in_addr_t my_address = 0;              // The network address of my ethernet port.
 static int walk_session_number = 0;    // The next session to send when doing the slow table walk.
 
 in_addr_t my_address = 0;              // The network address of my ethernet port.
 static int walk_session_number = 0;    // The next session to send when doing the slow table walk.


@@ -56,7 +56,7 @@ static struct {
 static struct {
        int seq;
        int size;
 static struct {
        int seq;
        int size;

-       char data[MAX_HEART_SIZE];
+       uint8_t data[MAX_HEART_SIZE];

 } past_hearts[HB_HISTORY_SIZE];        // Ring buffer of heartbeats that we've recently sent out. Needed so
                                // we can re-transmit if needed.
 
 } past_hearts[HB_HISTORY_SIZE];        // Ring buffer of heartbeats that we've recently sent out. Needed so
                                // we can re-transmit if needed.
 


@@ -127,6 +127,15 @@ int cluster_init()
        opt = 0;        // Turn off multicast loopback.
        setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &opt, sizeof(opt));
 
        opt = 0;        // Turn off multicast loopback.
        setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &opt, sizeof(opt));
 

+       if (config->cluster_mcast_ttl != 1)
+       {
+               uint8_t ttl = 0;
+               if (config->cluster_mcast_ttl > 0)
+                       ttl = config->cluster_mcast_ttl < 256 ? config->cluster_mcast_ttl : 255;
+
+               setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl));
+       }
+

        if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
        {
                LOG(0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno));
        if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0)
        {
                LOG(0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno));


@@ -178,7 +187,7 @@ static int cluster_send_data(void *data, int datalen)
 // Maintains the format. Assumes that the caller
 // has passed in a big enough buffer!
 //
 // Maintains the format. Assumes that the caller
 // has passed in a big enough buffer!
 //

-static void add_type(char **p, int type, int more, char *data, int size)
+static void add_type(uint8_t **p, int type, int more, uint8_t *data, int size)

 {
        *((uint32_t *) (*p)) = type;
        *p += sizeof(uint32_t);
 {
        *((uint32_t *) (*p)) = type;
        *p += sizeof(uint32_t);


@@ -193,7 +202,7 @@ static void add_type(char **p, int type, int more, char *data, int size)
 }
 
 // advertise our presence via BGP or gratuitous ARP
 }
 
 // advertise our presence via BGP or gratuitous ARP

-static void advertise(void)
+static void advertise_routes(void)

 {
 #ifdef BGP
        if (bgp_configured)
 {
 #ifdef BGP
        if (bgp_configured)


@@ -204,6 +213,15 @@ static void advertise(void)
                        send_garp(config->bind_address);        // Start taking traffic.
 }
 
                        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)
 static void cluster_uptodate(void)
 {
        if (config->cluster_iam_uptodate)


@@ -215,14 +233,14 @@ static void cluster_uptodate(void)
        config->cluster_iam_uptodate = 1;
 
        LOG(0, 0, 0, "Now uptodate with master.\n");
        config->cluster_iam_uptodate = 1;
 
        LOG(0, 0, 0, "Now uptodate with master.\n");

-       advertise();
+       advertise_routes();

 }
 
 //
 // Send a unicast UDP packet to a peer with 'data' as the
 // contents.
 //
 }
 
 //
 // Send a unicast UDP packet to a peer with 'data' as the
 // contents.
 //

-static int peer_send_data(in_addr_t peer, char *data, int size)
+static int peer_send_data(in_addr_t peer, uint8_t *data, int size)

 {
        struct sockaddr_in addr = {0};
 
 {
        struct sockaddr_in addr = {0};
 


@@ -250,10 +268,10 @@ static int peer_send_data(in_addr_t peer, char *data, int size)
 //
 // Send a structured message to a peer with a single element of type 'type'.
 //
 //
 // Send a structured message to a peer with a single element of type 'type'.
 //

-static int peer_send_message(in_addr_t peer, int type, int more, char *data, int size)
+static int peer_send_message(in_addr_t peer, int type, int more, uint8_t *data, int size)

 {
 {

-       char buf[65536];        // Vast overkill.
-       char *p = buf;
+       uint8_t buf[65536];     // Vast overkill.
+       uint8_t *p = buf;

 
        LOG(4, 0, 0, "Sending message to peer (type %d, more %d, size %d)\n", type, more, size);
        add_type(&p, type, more, data, size);
 
        LOG(4, 0, 0, "Sending message to peer (type %d, more %d, size %d)\n", type, more, size);
        add_type(&p, type, more, data, size);


@@ -261,16 +279,11 @@ static int peer_send_message(in_addr_t peer, int type, int more, char *data, int
        return peer_send_data(peer, buf, (p-buf) );
 }
 
        return peer_send_data(peer, buf, (p-buf) );
 }
 

-//
-// Forward a state changing packet to the master.
-//
-// The master just processes the payload as if it had
-// received it off the tun device.
-//
-int master_forward_packet(char *data, int size, in_addr_t addr, int port)
+// send a packet to the master
+static int _forward_packet(uint8_t *data, int size, in_addr_t addr, int port, int type)

 {
 {

-       char buf[65536];        // Vast overkill.
-       char *p = buf;
+       uint8_t buf[65536];     // Vast overkill.
+       uint8_t *p = buf;

 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;
 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;


@@ -278,13 +291,30 @@ int master_forward_packet(char *data, int size, in_addr_t addr, int port)
        LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr, 0), size);
 
        STAT(c_forwarded);
        LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr, 0), size);
 
        STAT(c_forwarded);

-       add_type(&p, C_FORWARD, addr, (char *) &port, sizeof(port));
+       add_type(&p, type, addr, (uint8_t *) &port, sizeof(port)); // ick. should be uint16_t

        memcpy(p, data, size);
        p += size;
 
        return peer_send_data(config->cluster_master_address, buf, (p - buf));
 }
 
        memcpy(p, data, size);
        p += size;
 
        return peer_send_data(config->cluster_master_address, buf, (p - buf));
 }
 

+// 
+// Forward a state changing packet to the master.
+//
+// The master just processes the payload as if it had
+// received it off the tun device.
+//
+int master_forward_packet(uint8_t *data, int size, in_addr_t addr, int port)
+{
+       return _forward_packet(data, size, addr, port, C_FORWARD);
+}
+
+// Forward a DAE RADIUS packet to the master.
+int master_forward_dae_packet(uint8_t *data, int size, in_addr_t addr, int port)
+{
+       return _forward_packet(data, size, addr, port, C_FORWARD_DAE);
+}
+

 //
 // Forward a throttled packet to the master for handling.
 //
 //
 // Forward a throttled packet to the master for handling.
 //


@@ -292,10 +322,10 @@ int master_forward_packet(char *data, int size, in_addr_t addr, int port)
 // token bucket queue, and lets normal processing take care
 // of it.
 //
 // token bucket queue, and lets normal processing take care
 // of it.
 //

-int master_throttle_packet(int tbfid, char *data, int size)
+int master_throttle_packet(int tbfid, uint8_t *data, int size)

 {
 {

-       char buf[65536];        // Vast overkill.
-       char *p = buf;
+       uint8_t buf[65536];     // Vast overkill.
+       uint8_t *p = buf;

 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;
 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;


@@ -317,10 +347,10 @@ int master_throttle_packet(int tbfid, char *data, int size)
 //
 // (Note that this must be called with the tun header
 // as the start of the data).
 //
 // (Note that this must be called with the tun header
 // as the start of the data).

-int master_garden_packet(sessionidt s, char *data, int size)
+int master_garden_packet(sessionidt s, uint8_t *data, int size)

 {
 {

-       char buf[65536];        // Vast overkill.
-       char *p = buf;
+       uint8_t buf[65536];     // Vast overkill.
+       uint8_t *p = buf;

 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;
 
        if (!config->cluster_master_address) // No election has been held yet. Just skip it.
                return -1;


@@ -337,7 +367,7 @@ int master_garden_packet(sessionidt s, char *data, int size)
 // Send a chunk of data as a heartbeat..
 // We save it in the history buffer as we do so.
 //
 // Send a chunk of data as a heartbeat..
 // We save it in the history buffer as we do so.
 //

-static void send_heartbeat(int seq, char *data, int size)
+static void send_heartbeat(int seq, uint8_t *data, int size)

 {
        int i;
 
 {
        int i;
 


@@ -359,8 +389,8 @@ static void send_heartbeat(int seq, char *data, int size)
 //
 void cluster_send_ping(time_t basetime)
 {
 //
 void cluster_send_ping(time_t basetime)
 {

-       char buff[100 + sizeof(pingt)];
-       char *p = buff;
+       uint8_t buff[100 + sizeof(pingt)];
+       uint8_t *p = buff;

        pingt x;
 
        if (config->cluster_iam_master && basetime)             // We're heartbeating so no need to ping.
        pingt x;
 
        if (config->cluster_iam_master && basetime)             // We're heartbeating so no need to ping.


@@ -373,7 +403,7 @@ void cluster_send_ping(time_t basetime)
        x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels;
        x.basetime = basetime;
 
        x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels;
        x.basetime = basetime;
 

-       add_type(&p, C_PING, basetime, (char *) &x, sizeof(x));
+       add_type(&p, C_PING, basetime, (uint8_t *) &x, sizeof(x));

        cluster_send_data(buff, (p-buff) );
 }
 
        cluster_send_data(buff, (p-buff) );
 }
 


@@ -393,10 +423,16 @@ void master_update_counts(void)
        if (config->cluster_iam_master)         // Only happens on the slaves.
                return;
 
        if (config->cluster_iam_master)         // Only happens on the slaves.
                return;
 

-       if (!config->cluster_master_address)            // If we don't have a master, skip it for a while.
+       if (!config->cluster_master_address)    // If we don't have a master, skip it for a while.
+               return;
+
+       // C_BYTES format changed in 2.1.0 (cluster version 5)
+       // during upgrade from previous versions, hang onto our counters
+       // for a bit until the new master comes up
+       if (config->cluster_last_hb_ver < 5)

                return;
 
                return;
 

-       i = MAX_B_RECS * 5; // Examine max 2000 sessions;
+       i = MAX_B_RECS * 5; // Examine max 3000 sessions;

        if (config->cluster_highest_sessionid > i)
                i = config->cluster_highest_sessionid;
 
        if (config->cluster_highest_sessionid > i)
                i = config->cluster_highest_sessionid;
 


@@ -407,17 +443,20 @@ void master_update_counts(void)
                        walk_session_number = 1;
 
                if (!sess_local[walk_session_number].cin && !sess_local[walk_session_number].cout)
                        walk_session_number = 1;
 
                if (!sess_local[walk_session_number].cin && !sess_local[walk_session_number].cout)

-                       continue; // Unused. Skip it.
+                       continue; // Unchanged. Skip it.

 
                b[c].sid = walk_session_number;
 
                b[c].sid = walk_session_number;

-               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;
+               b[c].pin = sess_local[walk_session_number].pin;
+               b[c].pout = sess_local[walk_session_number].pout;
+               b[c].cin = sess_local[walk_session_number].cin;
+               b[c].cout = sess_local[walk_session_number].cout;

 
                        // Reset counters.
 
                        // Reset counters.

+               sess_local[walk_session_number].pin = sess_local[walk_session_number].pout = 0;

                sess_local[walk_session_number].cin = sess_local[walk_session_number].cout = 0;
                sess_local[walk_session_number].cin = sess_local[walk_session_number].cout = 0;

+
+               if (++c > MAX_B_RECS)   // Send a max of 600 elements in a packet.
+                       break;

        }
 
        if (!c)         // Didn't find any that changes. Get out of here!
        }
 
        if (!c)         // Didn't find any that changes. Get out of here!


@@ -426,7 +465,7 @@ void master_update_counts(void)
 
                        // Forward the data to the master.
        LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c);
 
                        // Forward the data to the master.
        LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c);

-       peer_send_message(config->cluster_master_address, C_BYTES, c, (char *) &b, sizeof(b[0]) * c);
+       peer_send_message(config->cluster_master_address, C_BYTES, c, (uint8_t *) &b, sizeof(b[0]) * c);

        return;
 }
 
        return;
 }
 


@@ -457,17 +496,22 @@ void cluster_check_slaves(void)
                        continue;       // Shutdown peer! Skip them.
 
                if (peers[i].uptodate)
                        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
        }
 
                        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();
+       }

 }
 
 //
 }
 
 //


@@ -480,20 +524,22 @@ void cluster_check_master(void)
        int last_free = 0;
        clockt t = TIME;
        static int probed = 0;
        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...
 
        // 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
 
        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
+       // 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.
        // 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)));
 
                        LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
                                0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
 


@@ -508,10 +554,15 @@ void cluster_check_master(void)
                return; // Everything's ok!
 
        config->cluster_last_hb = TIME + 1;     // Just the one election thanks.
                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");
 
 
        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.
        {
                if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
                        continue;       // Stale peer! Skip them.


@@ -529,6 +580,9 @@ void cluster_check_master(void)
                        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.
                }
                        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
        }
 
                // Wow. it's been ages since I last heard a heartbeat


@@ -536,10 +590,14 @@ void cluster_check_master(void)
                // to become a master!!!
 
        config->cluster_iam_master = 1;
                // 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");
 
 
        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;
 
        if (config->cluster_seq_number == -1)
                config->cluster_seq_number = 0;
 


@@ -586,13 +644,17 @@ void cluster_check_master(void)
                        // Reset die relative to our uptime rather than the old master's
                if (session[i].die) session[i].die = TIME;
 
                        // 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_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;
+                       // Accumulate un-sent byte/packet counters.
+               increment_counter(&session[i].cin, &session[i].cin_wrap, sess_local[i].cin);
+               increment_counter(&session[i].cout, &session[i].cout_wrap, sess_local[i].cout);
+               session[i].cin_delta += sess_local[i].cin;
+               session[i].cout_delta += sess_local[i].cout;
+
+               session[i].pin += sess_local[i].pin;
+               session[i].pout += sess_local[i].pout;

 
                sess_local[i].cin = sess_local[i].cout = 0;
 
                sess_local[i].cin = sess_local[i].cout = 0;

+               sess_local[i].pin = sess_local[i].pout = 0;

 
                sess_local[i].radius = 0;       // Reset authentication as the radius blocks aren't up to date.
 
 
                sess_local[i].radius = 0;       // Reset authentication as the radius blocks aren't up to date.
 


@@ -620,9 +682,6 @@ void cluster_check_master(void)
        config->cluster_undefined_tunnels = 0;
        config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
 
        config->cluster_undefined_tunnels = 0;
        config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
 

-       if (!num_peers) // lone master
-               advertise();
-

        // FIXME. We need to fix up the tunnel control message
        // queue here! There's a number of other variables we
        // should also update.
        // FIXME. We need to fix up the tunnel control message
        // queue here! There's a number of other variables we
        // should also update.


@@ -688,7 +747,7 @@ static void cluster_check_sessions(int highsession, int freesession_ptr, int hig
                cluster_uptodate();
 }
 
                cluster_uptodate();
 }
 

-static int hb_add_type(char **p, int type, int id)
+static int hb_add_type(uint8_t **p, int type, int id)

 {
        switch (type) {
                case C_CSESSION: { // Compressed C_SESSION.
 {
        switch (type) {
                case C_CSESSION: { // Compressed C_SESSION.


@@ -702,13 +761,13 @@ static int hb_add_type(char **p, int type, int id)
                                // Did we compress the full structure, and is the size actually
                                // reduced??
                        if ( (d - orig) == sizeof(sessiont) && size < sizeof(sessiont) ) {
                                // Did we compress the full structure, and is the size actually
                                // reduced??
                        if ( (d - orig) == sizeof(sessiont) && size < sizeof(sessiont) ) {

-                               add_type(p, C_CSESSION, id, (char *) c, size);
+                               add_type(p, C_CSESSION, id, c, size);

                                break;
                        }
                        // Failed to compress : Fall through.
                }
                                break;
                        }
                        // Failed to compress : Fall through.
                }

-               case C_SESSION: add_type(p, C_SESSION, id,
-                       (char *) &session[id], sizeof(sessiont));
+               case C_SESSION:
+                       add_type(p, C_SESSION, id, (uint8_t *) &session[id], sizeof(sessiont));

                        break;
 
                case C_CTUNNEL: { // Compressed C_TUNNEL
                        break;
 
                case C_CTUNNEL: { // Compressed C_TUNNEL


@@ -727,8 +786,8 @@ static int hb_add_type(char **p, int type, int id)
                        }
                        // Failed to compress : Fall through.
                }
                        }
                        // Failed to compress : Fall through.
                }

-               case C_TUNNEL: add_type(p, C_TUNNEL, id,
-                       (char *) &tunnel[id], sizeof(tunnelt));
+               case C_TUNNEL:
+                       add_type(p, C_TUNNEL, id, (uint8_t *) &tunnel[id], sizeof(tunnelt));

                        break;
                default:
                        LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type);
                        break;
                default:
                        LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type);


@@ -744,9 +803,9 @@ static int hb_add_type(char **p, int type, int id)
 void cluster_heartbeat()
 {
        int i, count = 0, tcount = 0;
 void cluster_heartbeat()
 {
        int i, count = 0, tcount = 0;

-       char buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ];
+       uint8_t buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ];

        heartt h;
        heartt h;

-       char *p = buff;
+       uint8_t *p = buff;

 
        if (!config->cluster_iam_master)        // Only the master does this.
                return;
 
        if (!config->cluster_iam_master)        // Only the master does this.
                return;


@@ -770,7 +829,7 @@ void cluster_heartbeat()
        h.timeout  = config->cluster_hb_timeout;
        h.table_version = config->cluster_table_version;
 
        h.timeout  = config->cluster_hb_timeout;
        h.table_version = config->cluster_table_version;
 

-       add_type(&p, C_HEARTBEAT, HB_VERSION, (char *) &h, sizeof(h));
+       add_type(&p, C_HEARTBEAT, HB_VERSION, (uint8_t *) &h, sizeof(h));

 
        for (i = 0; i < config->cluster_num_changes; ++i) {
                hb_add_type(&p, cluster_changes[i].type, cluster_changes[i].id);
 
        for (i = 0; i < config->cluster_num_changes; ++i) {
                hb_add_type(&p, cluster_changes[i].type, cluster_changes[i].id);


@@ -902,6 +961,13 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
        int diff;
 
        LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave, 0), seq);
        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! 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;
+       }

 
        diff = config->cluster_seq_number - seq;        // How many packet do we need to send?
        if (diff < 0)
 
        diff = config->cluster_seq_number - seq;        // How many packet do we need to send?
        if (diff < 0)


@@ -913,9 +979,11 @@ static int cluster_catchup_slave(int seq, in_addr_t slave)
                return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do.
        }
 
                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) {
                // 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);
                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);


@@ -968,12 +1036,13 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
        }
 
        // Is this the master shutting down??
        }
 
        // 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();
                config->cluster_master_address = 0;
                config->cluster_last_hb = 0; // Force an election.
                cluster_check_master();

-               return 0;

        }
 
        if (i >= num_peers)
        }
 
        if (i >= num_peers)


@@ -1010,12 +1079,36 @@ static int cluster_add_peer(in_addr_t peer, time_t basetime, pingt *pp, int size
        return 1;
 }
 
        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;
+       if (master)
+       {
+               // catchup with new master
+               peer_send_message(master, C_LASTSEEN, config->cluster_seq_number, NULL, 0);
+
+               // delay next election
+               config->cluster_last_hb = TIME;
+       }
+
+       // run election (or reset "probed" if master was set)
+       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
 // the slow table walk to propogate this back out to the slaves.
 //
 /* Handle the slave updating the byte counters for the master. */
 //
 // Note that we don't mark the session as dirty; We rely on
 // the slow table walk to propogate this back out to the slaves.
 //

-static int cluster_handle_bytes(char *data, int size)
+static int cluster_handle_bytes(uint8_t *data, int size)

 {
        bytest *b;
 
 {
        bytest *b;
 


@@ -1032,13 +1125,16 @@ static int cluster_handle_bytes(char *data, int size)
                        return -1; /* Abort processing */
                }
 
                        return -1; /* Abort processing */
                }
 

-               session[b->sid].total_cin += b->in;
-               session[b->sid].total_cout += b->out;
+               session[b->sid].pin += b->pin;
+               session[b->sid].pout += b->pout;
+
+               increment_counter(&session[b->sid].cin, &session[b->sid].cin_wrap, b->cin);
+               increment_counter(&session[b->sid].cout, &session[b->sid].cout_wrap, b->cout);

 
 

-               session[b->sid].cin += b->in;
-               session[b->sid].cout += b->out;
+               session[b->sid].cin_delta += b->cin;
+               session[b->sid].cout_delta += b->cout;

 
 

-               if (b->in)
+               if (b->cin)

                        session[b->sid].last_packet = time_now; // Reset idle timer!
 
                size -= sizeof(*b);
                        session[b->sid].last_packet = time_now; // Reset idle timer!
 
                size -= sizeof(*b);


@@ -1151,6 +1247,9 @@ struct oldsession {
        uint32_t tx_connect_speed;
        uint32_t rx_connect_speed;
        uint32_t flags;
        uint32_t tx_connect_speed;
        uint32_t rx_connect_speed;
        uint32_t flags;

+#define SF_IPCP_ACKED  1       // Has this session seen an IPCP Ack?
+#define SF_LCP_ACKED   2       // LCP negotiated
+#define SF_CCP_ACKED   4       // CCP negotiated

        in_addr_t snoop_ip;
        uint16_t snoop_port;
        uint16_t sid;
        in_addr_t snoop_ip;
        uint16_t snoop_port;
        uint16_t sid;


@@ -1170,19 +1269,18 @@ static uint8_t *convert_session(struct oldsession *old)
        new.far = old->far;
        new.tunnel = old->tunnel;
        new.l2tp_flags = old->l2tp_flags;
        new.far = old->far;
        new.tunnel = old->tunnel;
        new.l2tp_flags = old->l2tp_flags;

-       new.flags = old->flags;

        new.ip = old->ip;
        new.ip_pool_index = old->ip_pool_index;
        new.unique_id = old->unique_id;
        new.nr = old->nr;
        new.ns = old->ns;
        new.magic = old->magic;
        new.ip = old->ip;
        new.ip_pool_index = old->ip_pool_index;
        new.unique_id = old->unique_id;
        new.nr = old->nr;
        new.ns = old->ns;
        new.magic = old->magic;

-       new.cin = old->cin;
-       new.cout = old->cout;

        new.pin = old->pin;
        new.pout = old->pout;
        new.pin = old->pin;
        new.pout = old->pout;

-       new.total_cin = old->total_cin;
-       new.total_cout = old->total_cout;
+       new.cin = old->total_cin;
+       new.cout = old->total_cout;
+       new.cin_delta = old->cin;
+       new.cout_delta = old->cout;

        new.throttle_in = old->throttle_in;
        new.throttle_out = old->throttle_out;
        new.filter_in = old->filter_in;
        new.throttle_in = old->throttle_in;
        new.throttle_out = old->throttle_out;
        new.filter_in = old->filter_in;


@@ -1210,6 +1308,21 @@ static uint8_t *convert_session(struct oldsession *old)
        for (i = 0; i < MAXROUTE; i++)
                memcpy(&new.route[i], &old->route[i], sizeof(new.route[i]));
 
        for (i = 0; i < MAXROUTE; i++)
                memcpy(&new.route[i], &old->route[i], sizeof(new.route[i]));
 

+       if (new.opened)
+       {
+               new.ppp.phase = Establish;
+               if (old->flags & (SF_IPCP_ACKED|SF_LCP_ACKED))
+               {
+                       new.ppp.phase = Network;
+                       new.ppp.lcp   = Opened;
+                       new.ppp.ipcp  = (old->flags & SF_IPCP_ACKED) ? Opened : Starting;
+                       new.ppp.ccp   = (old->flags & SF_CCP_ACKED)  ? Opened : Stopped;
+               }
+
+               // no PPPv6 in old session
+               new.ppp.ipv6cp = Stopped;
+       }
+

        return (uint8_t *) &new;
 }
 
        return (uint8_t *) &new;
 }
 


@@ -1283,13 +1396,37 @@ static int cluster_process_heartbeat(uint8_t *data, int size, int more, uint8_t
                        exit(1);
                }
 
                        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.
        }
 
                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) {
+                   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 == -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!!

+       config->cluster_last_hb_ver = hb_ver; // remember what cluster version the master is using

 
        if (config->cluster_seq_number != h->seq) {     // Out of sequence heartbeat!
                static int lastseen_seq = 0;
 
        if (config->cluster_seq_number != h->seq) {     // Out of sequence heartbeat!
                static int lastseen_seq = 0;


@@ -1461,10 +1598,10 @@ shortpacket:
 // We got a packet on the cluster port!
 // Handle pings, lastseens, and heartbeats!
 //
 // We got a packet on the cluster port!
 // Handle pings, lastseens, and heartbeats!
 //

-int processcluster(char *data, int size, in_addr_t addr)
+int processcluster(uint8_t *data, int size, in_addr_t addr)

 {
        int type, more;
 {
        int type, more;

-       char *p = data;
+       uint8_t *p = data;

        int s = size;
 
        if (addr == my_address)
        int s = size;
 
        if (addr == my_address)


@@ -1486,31 +1623,47 @@ int processcluster(char *data, int size, in_addr_t addr)
        p += sizeof(uint32_t);
        s -= sizeof(uint32_t);
 
        p += sizeof(uint32_t);
        s -= sizeof(uint32_t);
 

-       switch (type) {
-       case C_PING:    // Update the peers table.
+       switch (type)
+       {
+       case C_PING: // Update the peers table.

                return cluster_add_peer(addr, more, (pingt *) p, s);
 
                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_MASTER: // Our master is wrong
+               return cluster_set_master(addr, more);

 
 

-       case C_FORWARD: { // Forwarded control packet. pass off to processudp.
-               struct sockaddr_in a;
-               a.sin_addr.s_addr = more;
+       case C_LASTSEEN: // Catch up a slave (slave missed a packet).
+               return cluster_catchup_slave(more, addr);

 
 

-               a.sin_port = *(int *) p;
-               s -= sizeof(int);
-               p += sizeof(int);
+       case C_FORWARD: // Forwarded control packet. pass off to processudp.
+       case C_FORWARD_DAE: // Forwarded DAE packet. pass off to processdae.
+               if (!config->cluster_iam_master)
+               {
+                       LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD_%s from %s?\n",
+                               type == C_FORWARD_DAE ? "_DAE" : "", fmtaddr(addr, 0));

 
 

-               if (!config->cluster_iam_master) { // huh?
-                       LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD from %s?\n", fmtaddr(addr, 0));

                        return -1;
                }
                        return -1;
                }

+               else
+               {
+                       struct sockaddr_in a;
+                       a.sin_addr.s_addr = more;
+
+                       a.sin_port = *(int *) p;
+                       s -= sizeof(int);
+                       p += sizeof(int);
+
+                       LOG(4, 0, 0, "Got a forwarded %spacket... (%s:%d)\n",
+                               type == C_FORWARD_DAE ? "DAE " : "", fmtaddr(more, 0), a.sin_port);
+
+                       STAT(recv_forward);
+                       if (type == C_FORWARD_DAE)
+                               processdae(p, s, &a, sizeof(a));
+                       else
+                               processudp(p, s, &a);
+
+                       return 0;
+               }

 
 

-               LOG(4, 0, 0, "Got a forwarded packet... (%s:%d)\n", fmtaddr(more, 0), a.sin_port);
-               STAT(recv_forward);
-               processudp(p, s, &a);
-               return 0;
-       }

        case C_THROTTLE: {      // Receive a forwarded packet from a slave.
                if (!config->cluster_iam_master) {
                        LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr, 0));
        case C_THROTTLE: {      // Receive a forwarded packet from a slave.
                if (!config->cluster_iam_master) {
                        LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr, 0));


@@ -1531,6 +1684,11 @@ int processcluster(char *data, int size, in_addr_t addr)
                return 0;
 
        case C_BYTES:
                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).
                return cluster_handle_bytes(p, s);
 
        case C_KILL:    // The master asked us to die!? (usually because we're too out of date).


@@ -1682,7 +1840,7 @@ static int rle_decompress(uint8_t **src_p, int ssize, uint8_t *dst, int dsize)
 {
        int count;
        int orig_dsize = dsize;
 {
        int count;
        int orig_dsize = dsize;

-       char *src = *src_p;
+       uint8_t *src = *src_p;

 
        while (ssize >0 && dsize > 0) { // While there's more to decompress, and there's room in the decompress buffer...
                count = *src++; --ssize;  // get the count byte from the source.
 
        while (ssize >0 && dsize > 0) { // While there's more to decompress, and there's room in the decompress buffer...
                count = *src++; --ssize;  // get the count byte from the source.