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[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index 653364c..723579f 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,5 +1,5 @@
 // L2TPNS Global Stuff
 // L2TPNS Global Stuff

-// $Id: l2tpns.h,v 1.7 2004-06-23 03:52:24 fred_nerk Exp $
+// $Id: l2tpns.h,v 1.28 2004-11-03 13:23:59 bodea Exp $

 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__
 
 #ifndef __L2TPNS_H__
 #define __L2TPNS_H__


@@ -14,9 +14,8 @@
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <libcli.h>
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <libcli.h>

-#include "config.h"

 
 

-#define VERSION        "2.0.0"
+#define VERSION        "2.0.3"

 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535
 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535


@@ -25,13 +24,13 @@
 
 #define RADIUS_SHIFT   5
 #define RADIUS_MASK    ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
 
 #define RADIUS_SHIFT   5
 #define RADIUS_MASK    ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))

-#define        MAXRADIUS       ((2 << (RADIUS_SHIFT - 1)) * 255)
+#define        MAXRADIUS       ((unsigned long)(1L << RADIUS_SHIFT) * 255)

 
 #define T_UNDEF                (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
 #define T_FREE         (0)             // A tunnel ID that won't ever be used. Mark session as free.
 
 #define        MAXCONTROL      1000            // max length control message we ever send...
 
 #define T_UNDEF                (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
 #define T_FREE         (0)             // A tunnel ID that won't ever be used. Mark session as free.
 
 #define        MAXCONTROL      1000            // max length control message we ever send...

-#define        MAXETHER        (1500+18)       // max packet we try sending to tap
+#define        MAXETHER        (1500+18)       // max packet we try sending to tun

 #define        MAXTEL          96              // telephone number
 #define MAXPLUGINS     20              // maximum number of plugins to load
 #define MAXRADSERVER   10              // max radius servers
 #define        MAXTEL          96              // telephone number
 #define MAXPLUGINS     20              // maximum number of plugins to load
 #define MAXRADSERVER   10              // max radius servers


@@ -41,26 +40,38 @@
 #define MAX_LOG_LENGTH 512             // Maximum size of log message
 #define ECHO_TIMEOUT   60              // Time between last packet sent and LCP ECHO generation
 #define IDLE_TIMEOUT   240             // Time between last packet sent and LCP ECHO generation
 #define MAX_LOG_LENGTH 512             // Maximum size of log message
 #define ECHO_TIMEOUT   60              // Time between last packet sent and LCP ECHO generation
 #define IDLE_TIMEOUT   240             // Time between last packet sent and LCP ECHO generation

+#define BUSY_WAIT_TIME 3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown

 
 // Constants
 
 // Constants

-#ifndef PLUGINDIR
-#define PLUGINDIR      LIBDIR                  // Plugins
+#ifndef ETCDIR
+#define ETCDIR         "/etc/l2tpns"

 #endif
 
 #endif
 

-#ifndef PLUGINCONF
-#define PLUGINCONF     ETCDIR                  // Plugin config dir
+#ifndef LIBDIR
+#define LIBDIR         "/usr/lib/l2tpns"

 #endif
 
 #endif
 

-#ifndef DATADIR
-#define DATADIR                "/tmp"
+#ifndef STATEDIR
+#define STATEDIR       "/var/lib/l2tpns"
+#endif
+
+#ifndef PLUGINDIR
+#define PLUGINDIR      LIBDIR          // Plugins
+#endif
+
+#ifndef PLUGINCONF
+#define PLUGINCONF     ETCDIR          // Plugin config dir

 #endif
 
 #ifndef FLASHDIR
 #define FLASHDIR       ETCDIR
 #endif
 
 #endif
 
 #ifndef FLASHDIR
 #define FLASHDIR       ETCDIR
 #endif
 

-#define TAPDEVICE      "/dev/net/tun"
-#define        UDP             17
+#ifndef DATADIR
+#define DATADIR                STATEDIR
+#endif
+
+#define TUNDEVICE      "/dev/net/tun"

 #define STATEFILE      DATADIR "/state.dump"           // State dump file
 #define CONFIGFILE     FLASHDIR "/startup-config"      // Configuration file
 #define CLIUSERS       FLASHDIR "/users"               // CLI Users file
 #define STATEFILE      DATADIR "/state.dump"           // State dump file
 #define CONFIGFILE     FLASHDIR "/startup-config"      // Configuration file
 #define CLIUSERS       FLASHDIR "/users"               // CLI Users file


@@ -68,7 +79,6 @@
 #define ACCT_TIME      3000            // 5 minute accounting interval
 #define        L2TPPORT        1701            // L2TP port
 #define RADPORT                1645            // old radius port...
 #define ACCT_TIME      3000            // 5 minute accounting interval
 #define        L2TPPORT        1701            // L2TP port
 #define RADPORT                1645            // old radius port...

-#define        RADAPORT        1646            // old radius accounting port

 #define        PKTARP          0x0806          // ARP packet type
 #define        PKTIP           0x0800          // IP packet type
 #define PSEUDOMAC      0x0200          // pseudo MAC prefix (local significant MAC)
 #define        PKTARP          0x0806          // ARP packet type
 #define        PKTIP           0x0800          // IP packet type
 #define PSEUDOMAC      0x0200          // pseudo MAC prefix (local significant MAC)


@@ -92,7 +102,8 @@ enum
        ProtocolRej,
        EchoReq,
        EchoReply,
        ProtocolRej,
        EchoReq,
        EchoReply,

-       DiscardRequest
+       DiscardRequest,
+       IdentRequest

 };
 
 // Types
 };
 
 // Types


@@ -106,6 +117,27 @@ typedef u16 tunnelidt;
 typedef u32 clockt;
 typedef u8 hasht[16];
 
 typedef u32 clockt;
 typedef u8 hasht[16];
 

+// CLI actions
+struct cli_session_actions {
+       char action;
+       ipt snoop_ip;
+       u16 snoop_port;
+       int throttle_in;
+       int throttle_out;
+};
+
+#define CLI_SESS_KILL          0x01
+#define CLI_SESS_SNOOP         0x02
+#define CLI_SESS_NOSNOOP       0x04
+#define CLI_SESS_THROTTLE      0x08
+#define CLI_SESS_NOTHROTTLE    0x10
+
+struct cli_tunnel_actions {
+       char action;
+};
+
+#define CLI_TUN_KILL           0x01
+

 // dump header: update number if internal format changes
 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 
 // dump header: update number if internal format changes
 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 


@@ -125,15 +157,14 @@ typedef struct controls         // control message
 }
 controlt;
 
 }
 controlt;
 

-// 336 bytes per session

 typedef struct sessions
 {
        sessionidt next;                // next session in linked list
        sessionidt far;                 // far end session ID
 typedef struct sessions
 {
        sessionidt next;                // next session in linked list
        sessionidt far;                 // far end session ID

-       tunnelidt tunnel;               // tunnel ID
+       tunnelidt tunnel;               // near end tunnel ID

        ipt ip;                         // IP of session set by RADIUS response (host byte order).
        int ip_pool_index;              // index to IP pool
        ipt ip;                         // IP of session set by RADIUS response (host byte order).
        int ip_pool_index;              // index to IP pool

-       unsigned long sid;              // session id for hsddb
+       unsigned long unique_id;        // unique session id

        u16 nr;                         // next receive
        u16 ns;                         // next send
        u32 magic;                      // ppp magic number
        u16 nr;                         // next receive
        u16 ns;                         // next send
        u32 magic;                      // ppp magic number


@@ -142,7 +173,8 @@ typedef struct sessions
        u32 total_cin;                  // This counter is never reset while a session is open
        u32 total_cout;                 // This counter is never reset while a session is open
        u32 id;                         // session id
        u32 total_cin;                  // This counter is never reset while a session is open
        u32 total_cout;                 // This counter is never reset while a session is open
        u32 id;                         // session id

-       u32 throttle;                   // non-zero if this session is throttled.
+       u16 throttle_in;                // upstream throttle rate (kbps)
+       u16 throttle_out;               // downstream throttle rate

        clockt opened;                  // when started
        clockt die;                     // being closed, when to finally free
        time_t last_packet;             // Last packet from the user (used for idle timeouts)
        clockt opened;                  // when started
        clockt die;                     // being closed, when to finally free
        time_t last_packet;             // Last packet from the user (used for idle timeouts)


@@ -153,6 +185,7 @@ typedef struct sessions
        u16 tbf_in;                     // filter bucket for throttling in from the user.
        u16 tbf_out;                    // filter bucket for throttling out to the user.
        u8 l2tp_flags;                  // various bit flags from the ICCN on the l2tp tunnel.
        u16 tbf_in;                     // filter bucket for throttling in from the user.
        u16 tbf_out;                    // filter bucket for throttling out to the user.
        u8 l2tp_flags;                  // various bit flags from the ICCN on the l2tp tunnel.

+       u8 reserved_old_snoop;          // No longer used - remove at some time

        u8 walled_garden;               // is this session gardened?
        u8 flags1;                      // additional flags (currently unused);
        char random_vector[MAXTEL];
        u8 walled_garden;               // is this session gardened?
        u8 flags1;                      // additional flags (currently unused);
        char random_vector[MAXTEL];


@@ -165,7 +198,8 @@ typedef struct sessions
        u32 flags;                      // Various session flags.
        ipt snoop_ip;                   // Interception destination IP
        u16 snoop_port;                 // Interception destination port
        u32 flags;                      // Various session flags.
        ipt snoop_ip;                   // Interception destination IP
        u16 snoop_port;                 // Interception destination port

-       char reserved[28];              // Space to expand structure without changing HB_VERSION
+       u16 sid;                        // near end session id.
+       char reserved[20];              // Space to expand structure without changing HB_VERSION

 }
 sessiont;
 
 }
 sessiont;
 


@@ -178,6 +212,7 @@ typedef struct {
 
 #define        SESSIONPFC      1            // PFC negotiated flags
 #define        SESSIONACFC     2           // ACFC negotiated flags
 
 #define        SESSIONPFC      1            // PFC negotiated flags
 #define        SESSIONACFC     2           // ACFC negotiated flags

+#define SESSIONLCPACK  4       // LCP negotiated

 
 // 168 bytes per tunnel
 typedef struct tunnels
 
 // 168 bytes per tunnel
 typedef struct tunnels


@@ -272,12 +307,12 @@ struct Tstats
     time_t             start_time;
     time_t             last_reset;
 
     time_t             start_time;
     time_t             last_reset;
 

-    unsigned long      tap_rx_packets;
-    unsigned long      tap_tx_packets;
-    unsigned long      tap_rx_bytes;
-    unsigned long      tap_tx_bytes;
-    unsigned long      tap_rx_errors;
-    unsigned long      tap_tx_errors;
+    unsigned long      tun_rx_packets;
+    unsigned long      tun_tx_packets;
+    unsigned long      tun_rx_bytes;
+    unsigned long      tun_tx_bytes;
+    unsigned long      tun_rx_errors;
+    unsigned long      tun_tx_errors;

 
     unsigned long      tunnel_rx_packets;
     unsigned long      tunnel_tx_packets;
 
     unsigned long      tunnel_rx_packets;
     unsigned long      tunnel_tx_packets;


@@ -289,11 +324,7 @@ struct Tstats
     unsigned long      tunnel_retries;
     unsigned long      radius_retries;
 
     unsigned long      tunnel_retries;
     unsigned long      radius_retries;
 

-    unsigned long      arp_errors;
-    unsigned long      arp_replies;
-    unsigned long      arp_discarded;

     unsigned long      arp_sent;
     unsigned long      arp_sent;

-    unsigned long      arp_recv;

 
     unsigned long      packets_snooped;
 
 
     unsigned long      packets_snooped;
 


@@ -311,9 +342,8 @@ struct Tstats
 
     unsigned long      c_forwarded;
     unsigned long      recv_forward;
 
     unsigned long      c_forwarded;
     unsigned long      recv_forward;

-#ifdef STAT_CALLS
-    unsigned long      call_processtap;
-    unsigned long      call_processarp;
+#ifdef STATISTICS
+    unsigned long      call_processtun;

     unsigned long      call_processipout;
     unsigned long      call_processudp;
     unsigned long      call_sessionbyip;
     unsigned long      call_processipout;
     unsigned long      call_processudp;
     unsigned long      call_sessionbyip;


@@ -343,11 +373,19 @@ struct Tstats
 };
 
 #ifdef STATISTICS
 };
 
 #ifdef STATISTICS

-#define STAT(x)                _statistics->x++
-#define INC_STAT(x,y)  _statistics->x += y
-#define GET_STAT(x)    _statistics->x
-#define SET_STAT(x, y) _statistics->x = y
+
+#ifdef STAT_CALLS
+#define CSTAT(x)       STAT(x)

 #else
 #else

+#define CSTAT(x)
+#endif
+
+#define STAT(x)                (_statistics->x++)
+#define INC_STAT(x,y)  (_statistics->x += (y))
+#define GET_STAT(x)    (_statistics->x)
+#define SET_STAT(x, y) (_statistics->x = (y))
+#else
+#define CSTAT(x)

 #define STAT(x)
 #define INC_STAT(x,y)
 #define GET_STAT(x)    0
 #define STAT(x)
 #define INC_STAT(x,y)
 #define GET_STAT(x)    0


@@ -359,26 +397,33 @@ struct configt
        int             debug;                          // debugging level
        time_t          start_time;                     // time when l2tpns was started
        char            bandwidth[256];                 // current bandwidth
        int             debug;                          // debugging level
        time_t          start_time;                     // time when l2tpns was started
        char            bandwidth[256];                 // current bandwidth

-       clockt          current_time;
+       char            pid_file[256];                  // file to write PID to on startup
+       int             wrote_pid;
+       clockt          current_time;                   // 1/10ths of a second since the process started.
+                                                       // means that we can only run a given process
+                                                       // for 13 years without re-starting!

 
        char            config_file[128];
        int             reload_config;                  // flag to re-read config (set by cli)
        int             cleanup_interval;               // interval between regular cleanups (in seconds)
        int             multi_read_count;               // amount of packets to read per fd in processing loop
 
 
        char            config_file[128];
        int             reload_config;                  // flag to re-read config (set by cli)
        int             cleanup_interval;               // interval between regular cleanups (in seconds)
        int             multi_read_count;               // amount of packets to read per fd in processing loop
 

-       char            tapdevice[10];                  // tap device name
+       char            tundevice[10];                  // tun device name

        char            log_filename[128];
        char            l2tpsecret[64];
 
        char            radiussecret[64];
        int             radius_accounting;
        ipt             radiusserver[MAXRADSERVER];     // radius servers
        char            log_filename[128];
        char            l2tpsecret[64];
 
        char            radiussecret[64];
        int             radius_accounting;
        ipt             radiusserver[MAXRADSERVER];     // radius servers

+       u16             radiusport[MAXRADSERVER];       // radius base ports

        u8              numradiusservers;               // radius server count
        short           num_radfds;                     // Number of radius filehandles allocated
 
        ipt             default_dns1, default_dns2;
 
        u8              numradiusservers;               // radius server count
        short           num_radfds;                     // Number of radius filehandles allocated
 
        ipt             default_dns1, default_dns2;
 

-       unsigned long   rl_rate;
+       unsigned long   rl_rate;                        // default throttle rate
+       int             num_tbfs;                       // number of throttle buckets
+

        int             save_state;
        char            accounting_dir[128];
        ipt             bind_address;
        int             save_state;
        char            accounting_dir[128];
        ipt             bind_address;


@@ -390,16 +435,16 @@ struct configt
        char            old_plugins[64][MAXPLUGINS];
 
        int             next_tbf;                       // Next HTB id available to use
        char            old_plugins[64][MAXPLUGINS];
 
        int             next_tbf;                       // Next HTB id available to use

-       int             scheduler_fifo;                 // If 1, will force scheduler to use SCHED_FIFO.
-                                                       // Don't use this unless you have a dual processor machine!
-       int             icmp_rate;                      // Max number of ICMP unreachable per second to send
+       int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
+       int             lock_pages;                     // Lock pages into memory.
+       int             icmp_rate;                      // Max number of ICMP unreachable per second to send>

 
 

-       u32     cluster_address;                // Multicast address of cluster.
+       u32             cluster_address;                // Multicast address of cluster.

                                                        // Send to this address to have everyone hear.
        char            cluster_interface[64];          // Which interface to listen for multicast on.
        int             cluster_iam_master;             // Are we the cluster master???
        int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
                                                        // Send to this address to have everyone hear.
        char            cluster_interface[64];          // Which interface to listen for multicast on.
        int             cluster_iam_master;             // Are we the cluster master???
        int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.

-       u32     cluster_master_address;         // The network address of the cluster master.
+       u32             cluster_master_address;         // The network address of the cluster master.

                                                        // Zero if i am the cluster master.
        int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
                                                        // (or the seq number we're next expecting if we're a slave).
                                                        // Zero if i am the cluster master.
        int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
                                                        // (or the seq number we're next expecting if we're a slave).


@@ -410,6 +455,9 @@ struct configt
        clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
        int             cluster_num_changes;            // Number of changes queued.
 
        clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
        int             cluster_num_changes;            // Number of changes queued.
 

+       int             cluster_hb_interval;            // How often to send a heartbeat.
+       int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
+

 #ifdef BGP
        u16             as_number;
        char            bgp_peer[2][64];
 #ifdef BGP
        u16             as_number;
        char            bgp_peer[2][64];


@@ -422,7 +470,7 @@ struct config_descriptt
        char *key;
        int offset;
        int size;
        char *key;
        int offset;
        int size;

-       enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP } type;
+       enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC } type;

 };
 
 // arp.c
 };
 
 // arp.c


@@ -451,25 +499,14 @@ void radiusretry(u16 r);
 u16 radiusnew(sessionidt s);
 void radiusclear(u16 r, sessionidt s);
 
 u16 radiusnew(sessionidt s);
 void radiusclear(u16 r, sessionidt s);
 

-// throttle.c
-int throttle_session(sessionidt s, int throttle);
-
-
-// rl.c
-void init_rl();
-u16 rl_create_tbf();
-u16 rl_get_tbf();
-void rl_done_tbf(u16 t);
-void rl_destroy_tbf(u16 t);
-

 
 // l2tpns.c
 clockt now(void);
 clockt backoff(u8 try);
 void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);
 
 // l2tpns.c
 clockt now(void);
 clockt backoff(u8 try);
 void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);

-void inittap(void);
+void inittun(void);

 void initudp(void);
 void initudp(void);

-void initdata(void);
+void initdata(int optdebug, char *optconfig);

 void initippool();
 sessionidt sessionbyip(ipt ip);
 sessionidt sessionbyuser(char *username);
 void initippool();
 sessionidt sessionbyip(ipt ip);
 sessionidt sessionbyuser(char *username);


@@ -491,7 +528,7 @@ void sendipcp(tunnelidt t, sessionidt s);
 void processipout(u8 * buf, int len);
 void processarp(u8 * buf, int len);
 void processudp(u8 * buf, int len, struct sockaddr_in *addr);
 void processipout(u8 * buf, int len);
 void processarp(u8 * buf, int len);
 void processudp(u8 * buf, int len, struct sockaddr_in *addr);

-void processtap(u8 * buf, int len);
+void processtun(u8 * buf, int len);

 void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
 int assign_ip_address(sessionidt s);
 void free_ip_address(sessionidt s);
 void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
 int assign_ip_address(sessionidt s);
 void free_ip_address(sessionidt s);


@@ -502,20 +539,23 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 
 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 

-#define log _log
-#ifndef log_hex
-#define log_hex(a,b,c,d) do{if (a <= config->debug) _log_hex(a,0,0,0,b,c,d);}while (0)
-#endif
+#undef log
+#undef log_hex
+#define log(D, a, s, t, f, ...)        ({ if (D <= config->debug) _log(D, a, s, t, f, ## __VA_ARGS__); })
+#define log_hex(D, t, d, s)    ({ if (D <= config->debug) _log_hex(D, t, d, s); })
+

 void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));
 void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));

-void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize);
+void _log_hex(int level, const char *title, const char *data, int maxsize);
+

 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
 int sessionsetup(tunnelidt t, sessionidt s);
 int cluster_send_session(int s);
 int cluster_send_tunnel(int t);
 int cluster_send_goodbye();
 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
 int sessionsetup(tunnelidt t, sessionidt s);
 int cluster_send_session(int s);
 int cluster_send_tunnel(int t);
 int cluster_send_goodbye();

-void init_cli();
+void init_cli(char *hostname);

 void cli_do_file(FILE *fh);
 void cli_do(int sockfd);
 void cli_do_file(FILE *fh);
 void cli_do(int sockfd);

+int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);

 #ifdef RINGBUFFER
 void ringbuffer_dump(FILE *stream);
 #endif
 #ifdef RINGBUFFER
 void ringbuffer_dump(FILE *stream);
 #endif


@@ -529,7 +569,7 @@ void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int pac
 void fix_address_pool(int sid);
 void rebuild_address_pool(void);
 void send_ipin(sessionidt s, u8 * buf, int len);
 void fix_address_pool(int sid);
 void rebuild_address_pool(void);
 void send_ipin(sessionidt s, u8 * buf, int len);

-int throttle_session(sessionidt s, int throttle);
+void throttle_session(sessionidt s, int rate_in, int rate_out);

 int load_session(sessionidt, sessiont *);
 void become_master(void);      // We're the master; kick off any required master initializations.
 extern tunnelt *tunnel;
 int load_session(sessionidt, sessiont *);
 void become_master(void);      // We're the master; kick off any required master initializations.
 extern tunnelt *tunnel;


@@ -557,8 +597,32 @@ if (count++ < max) { \
 extern struct configt *config;
 extern time_t basetime;                // Time when this process started.
 extern time_t time_now;                // Seconds since EPOCH.
 extern struct configt *config;
 extern time_t basetime;                // Time when this process started.
 extern time_t time_now;                // Seconds since EPOCH.

-extern u32 last_sid;
+extern u32 last_id;

 extern struct Tstats *_statistics;
 extern ipt my_address;
 extern int tun_write(u8 *data, int size);
 extern struct Tstats *_statistics;
 extern ipt my_address;
 extern int tun_write(u8 *data, int size);

+extern int clifd;
+
+
+#define TIME (config->current_time)
+
+// macros for handling help in cli commands
+#define CLI_HELP_REQUESTED     (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
+#define CLI_HELP_NO_ARGS       (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
+
+// CVS identifiers (for "show version file")
+extern char const *cvs_id_arp;
+extern char const *cvs_id_cli;
+extern char const *cvs_id_cluster;
+extern char const *cvs_id_constants;
+extern char const *cvs_id_control;
+extern char const *cvs_id_icmp;
+extern char const *cvs_id_l2tpns;
+extern char const *cvs_id_ll;
+extern char const *cvs_id_md5;
+extern char const *cvs_id_ppp;
+extern char const *cvs_id_radius;
+extern char const *cvs_id_tbf;
+extern char const *cvs_id_util;
+

 #endif /* __L2TPNS_H__ */
 #endif /* __L2TPNS_H__ */