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Send a keep alive signal every second to keep UDP tunnels from collapsin... #45

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Send a keep alive signal every second to keep UDP tunnels from collapsin... #45

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efdce43
Send a keep alive signal every second to keep UDP tunnels from collap…
Jul 30, 2014
906b0d6
trying to make the keep alive working
Jul 30, 2014
034c2e9
Drawing of the state machine doing the mtu discovery
Aug 5, 2014
05c12de
Implemented, but not yet correct ping behavior
Aug 7, 2014
af85dd5
Rewrite of the mtu probing as a state machine
Aug 7, 2014
678c23a
Removed debugging messages
Aug 7, 2014
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30 changes: 30 additions & 0 deletions doc/mtu_state_machine.dot
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
digraph finite_state_machine {

node [shape = doublecircle];
start [ label = "start" ];

node [shape = circle];
probes [ label = "probing" ];
w_probes [ label = "waiting\nfor probes" ];

ping [ label = "pinging" ];
w_ping [ label = "wait ping\ninterval" ];
to_ping [ label = "ping\ntimeout" ];

start -> probes [ label = "/counter = 0 && minmtu = 0" ];
probes -> w_probes [ label = "/send burst\n&& counter++" ];
w_probes -> probes [ label = "1 second passes/" ];
w_probes -> w_probes [ label = "received probe/set minmtu" ];
probes -> ping [ label = "counter >= 10\n&& !minmtu/" ];
probes -> ping [ label = "counter < 30\n&& minmtu >= maxmtu\n|| counter == 30/set mtu" ];

ping -> to_ping [ label = "/send burst" ];
w_ping -> ping [ label = "ping interval passes/" ];
to_ping -> w_ping [ label = "ping timeout passes\n&& !minmtu/" ];
to_ping -> start [ label = "ping timeout passes\n&& minmtu/", weight = 2 ];
to_ping -> w_ping [ label = "ping received/\nset minmtu" ];
to_ping -> probes [ label = "ping received\n&& ping mtu > maxmtu/\ncounter = 10\n&& maxmtu = MTU" ];
w_ping -> probes [ label = "ping received\n&& ping mtu > maxmtu/\ncounter = 10\n&& maxmtu = MTU" ];
w_ping -> w_ping [ label = "ping received/\nset minmtu" ];
}

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1 change: 1 addition & 0 deletions src/conf.c
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Expand Up @@ -39,6 +39,7 @@ splay_tree_t *config_tree;

int pinginterval = 0; /* seconds between pings */
int pingtimeout = 0; /* seconds to wait for response */
int keepaliveinterval = 0; /* seconds between keep alive packets */
list_t *cmdline_conf = NULL; /* global/host configuration values given at the command line */

static int config_compare(const config_t *a, const config_t *b) {
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1 change: 1 addition & 0 deletions src/conf.h
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Expand Up @@ -37,6 +37,7 @@ extern splay_tree_t *config_tree;

extern int pinginterval;
extern int pingtimeout;
extern int keepaliveinterval;
extern int maxtimeout;
extern bool bypass_security;
extern list_t *cmdline_conf;
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1 change: 1 addition & 0 deletions src/net.h
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Expand Up @@ -191,6 +191,7 @@ extern bool node_read_ecdsa_public_key(struct node_t *);
extern bool read_ecdsa_public_key(struct connection_t *);
extern bool read_rsa_public_key(struct connection_t *);
extern void send_mtu_probe(struct node_t *);
extern void create_mtu_probe(vpn_packet_t *, int *);
extern void handle_device_data(void *, int);
extern void handle_meta_connection_data(struct connection_t *);
extern void regenerate_key(void);
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