- fix case where ll_delete removes the last entry

[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index e9c5907..dc6d8e6 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,20 +1,38 @@
 // L2TPNS Global Stuff
 // L2TPNS Global Stuff

-// $Id: l2tpns.h,v 1.1 2003/12/16 07:07:39 fred_nerk Exp $
+// $Id: l2tpns.h,v 1.35 2004/11/16 07:54:32 bodea Exp $
+
+#ifndef __L2TPNS_H__
+#define __L2TPNS_H__

 
 #include <netinet/in.h>
 
 #include <netinet/in.h>

+#include <execinfo.h>

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

+#include <signal.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <libcli.h>

 
 

-#include "config.h"
-
-#define VERSION        "1.0"
+#define VERSION        "2.0.8"

 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535
 #define MAXSESSION     50000           // could be up to 65535
 
 // Limits
 #define MAXTUNNEL      500             // could be up to 65535
 #define MAXSESSION     50000           // could be up to 65535

-#define        MAXRADIUS       255
+#define MAXTBFS                6000            // Maximum token bucket filters. Might need up to 2 * session.
+
+#define RADIUS_SHIFT   5
+#define RADIUS_MASK    ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
+#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        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        MAXTEL          96              // telephone number

+#define MAXPLUGINS     20              // maximum number of plugins to load

 #define MAXRADSERVER   10              // max radius servers
 #define        MAXROUTE        10              // max static routes per session
 #define MAXIPPOOL      131072          // max number of ip addresses in pool
 #define MAXRADSERVER   10              // max radius servers
 #define        MAXROUTE        10              // max static routes per session
 #define MAXIPPOOL      131072          // max number of ip addresses in pool


@@ -22,26 +40,45 @@
 #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

-#define STATISTICS
-#define STAT_CALLS
-#define RINGBUFFER
-#define        UDP             17
-#define TAPDEVICE      "/dev/net/tun"
-#define CLIUSERS       ETCDIR "l2tpns.users"   // CLI Users file
-#define CONFIGFILE     ETCDIR "l2tpns.cfg"     // Configuration file
-#define IPPOOLFILE     ETCDIR "l2tpns.ip_pool" // Address pool configuration
-#define STATEFILE      "/tmp/l2tpns.dump"      // State dump file
+#ifndef ETCDIR
+#define ETCDIR         "/etc/l2tpns"
+#endif

 
 #ifndef LIBDIR
 #define LIBDIR         "/usr/lib/l2tpns"
 #endif
 
 
 #ifndef LIBDIR
 #define LIBDIR         "/usr/lib/l2tpns"
 #endif
 

+#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
+
+#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 IPPOOLFILE     FLASHDIR "/ip_pool"             // Address pool configuration

 #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)


@@ -52,20 +89,22 @@
 #define        PPPCCP          0x80FD
 #define PPPIP          0x0021
 #define PPPMP          0x003D
 #define        PPPCCP          0x80FD
 #define PPPIP          0x0021
 #define PPPMP          0x003D

-#define ConfigReq      1
-#define ConfigAck      2
-#define ConfigNak      3
-#define ConfigRej      4
-#define TerminateReq   5
-#define TerminateAck   6
-#define CodeRej                7
-#define ProtocolRej    8
-#define EchoReq                9
-#define EchoReply      10
-#define DiscardRequest 11
-
-#undef TC_TBF
-#define TC_HTB
+#define MIN_IP_SIZE    0x19
+enum
+{
+       ConfigReq = 1,
+       ConfigAck,
+       ConfigNak,
+       ConfigRej,
+       TerminateReq,
+       TerminateAck,
+       CodeRej,
+       ProtocolRej,
+       EchoReq,
+       EchoReply,
+       DiscardRequest,
+       IdentRequest
+};

 
 // Types
 typedef unsigned short u16;
 
 // Types
 typedef unsigned short u16;


@@ -78,6 +117,30 @@ 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 "#"
+

 // structures
 typedef struct routes           // route
 {
 // structures
 typedef struct routes           // route
 {


@@ -88,73 +151,83 @@ routet;
 
 typedef struct controls         // control message
 {
 
 typedef struct controls         // control message
 {

-       struct controls *next;       // next in queue
+       struct controls *next;  // next in queue

        u16 length;             // length
        u8 buf[MAXCONTROL];
 }
 controlt;
 
        u16 length;             // length
        u8 buf[MAXCONTROL];
 }
 controlt;
 

-typedef struct stbft
-{
-    struct stbft *next;
-    char handle[10];
-    char in_use;
-    int mark;
-} tbft;
-
-
-// 336 bytes per session

 typedef struct sessions
 {
 typedef struct sessions
 {

-       sessionidt next;             // next session in linked list
-       sessionidt far;              // far end session ID
-       tunnelidt tunnel;            // tunnel ID
-       ipt ip;                 // IP of session set by RADIUS response
-       unsigned long sid;      // session id for hsddb
-       u16 nr;                 // next receive
-       u16 ns;                 // next send
-       u32 magic;              // ppp magic number
-       u32 cin, cout;               // byte counts
-       u32 pin, pout;               // packet counts
-       u32 id;                 // session id
-       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)
-       ipt dns1, dns2;               // DNS servers
-       routet route[MAXROUTE];    // static routes
-       u8 radius;             // which radius session is being used (0 for not waiting on authentication)
-       u8 flags;              // various bit flags
-       u8 snoop;               // are we snooping this session?
-       u8 throttle;            // is this session throttled?
-       u8 walled_garden;       // is this session stuck in the walled garden?
-       u16 mru;                // maximum receive unit
-       u16 tbf;                // filter bucket for throttling
+       sessionidt next;                // next session in linked list
+       sessionidt far;                 // far end session 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
+       unsigned long unique_id;        // unique session id
+       u16 nr;                         // next receive
+       u16 ns;                         // next send
+       u32 magic;                      // ppp magic number
+       u32 cin, cout;                  // byte counts
+       u32 pin, pout;                  // packet counts
+       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
+       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)
+       ipt dns1, dns2;                 // DNS servers
+       routet route[MAXROUTE];         // static routes
+       u16 radius;                     // which radius session is being used (0 for not waiting on authentication)
+       u16 mru;                        // maximum receive unit
+       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];
        int random_vector_length;
        char random_vector[MAXTEL];
        int random_vector_length;

-       char user[129];          // user (needed in seesion for radius stop messages)
-       char called[MAXTEL];     // called number
-       char calling[MAXTEL];     // calling number
-       unsigned long tx_connect_speed;
-       unsigned long rx_connect_speed;
+       char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
+       char called[MAXTEL];            // called number
+       char calling[MAXTEL];           // calling number
+       u32 tx_connect_speed;
+       u32 rx_connect_speed;
+       u32 flags;                      // Various session flags.
+       ipt snoop_ip;                   // Interception destination IP
+       u16 snoop_port;                 // Interception destination port
+       u16 sid;                        // near end session id.
+       char reserved[20];              // Space to expand structure without changing HB_VERSION

 }
 sessiont;
 
 }
 sessiont;
 

-#define        SESSIONPFC      1            // PFC negotiated flags
-#define        SESSIONACFC     2           // ACFC negotiated flags
+#define SF_IPCP_ACKED  1       // Has this session seen an IPCP Ack?
+#define SF_LCP_ACKED   2       // LCP negotiated
+
+typedef struct {
+       u32     cin;
+       u32     cout;
+} sessioncountt;
+
+#define        SESSIONPFC      1       // PFC negotiated flags
+#define        SESSIONACFC     2       // ACFC negotiated flags

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

-       tunnelidt next;         // next tunnel in linked list

        tunnelidt far;          // far end tunnel ID
        ipt ip;                 // Ip for far end
        portt port;             // port for far end
        u16 window;             // Rx window
        u16 nr;                 // next receive
        u16 ns;                 // next send
        tunnelidt far;          // far end tunnel ID
        ipt ip;                 // Ip for far end
        portt port;             // port for far end
        u16 window;             // Rx window
        u16 nr;                 // next receive
        u16 ns;                 // next send

+       int state;              // current state (tunnelstate enum)

        clockt last;            // when last control message sent (used for resend timeout)
        clockt retry;           // when to try resenting pending control
        clockt die;             // being closed, when to finally free
        clockt last;            // when last control message sent (used for resend timeout)
        clockt retry;           // when to try resenting pending control
        clockt die;             // being closed, when to finally free

+       clockt lastrec;         // when the last control message was received

        char hostname[128];     // tunnel hostname
        char vendor[128];       // LAC vendor
        u8 try;                 // number of retrys on a control message
        char hostname[128];     // tunnel hostname
        char vendor[128];       // LAC vendor
        u8 try;                 // number of retrys on a control message


@@ -165,25 +238,27 @@ typedef struct tunnels
 tunnelt;
 
 // 180 bytes per radius session
 tunnelt;
 
 // 180 bytes per radius session

-typedef struct radiuss          // outstanding RADIUS requests
+typedef struct radiuss         // outstanding RADIUS requests

 {
 {

-       u8 next;               // next in free list
-       sessionidt session;          // which session this applies to
-       hasht auth;               // request authenticator
-       clockt retry;              // ehwne to try next
-       char calling[MAXTEL];    // calling number
-       char pass[129];          // password
-       u8 id;                 // ID for PPP response
-       u8 try;                // which try we are on
-       u8 state;              // state of radius requests
-       u8 chap;               // set if CHAP used (is CHAP identifier)
+       sessionidt session;     // which session this applies to
+       hasht auth;             // request authenticator
+       clockt retry;           // when to try next
+       char calling[MAXTEL];   // calling number
+       char pass[129];         // password
+       u8 id;                  // ID for PPP response
+       u8 try;                 // which try we are on
+       u8 state;               // state of radius requests
+       u8 chap;                // set if CHAP used (is CHAP identifier)

 }
 radiust;
 
 typedef struct
 {
 }
 radiust;
 
 typedef struct
 {

-       ipt     address;
-       char    assigned;       // 1 if assigned, 0 if free
+       ipt             address;        // Host byte order..
+       char            assigned;       // 1 if assigned, 0 if free
+       sessionidt      session;
+       clockt          last;           // last used
+       char            user[129];      // user (try to have ip addresses persistent)

 }
 ippoolt;
 
 }
 ippoolt;
 


@@ -202,15 +277,29 @@ struct Tringbuffer
 };
 #endif
 
 };
 #endif
 

+/*
+ * Possible tunnel states
+ * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
+ */

 enum
 {
 enum
 {

-    RADIUSNULL,                   // Not in use
-    RADIUSCHAP,                   // sending CHAP down PPP
-    RADIUSAUTH,                   // sending auth to RADIUS server
-    RADIUSIPCP,                   // sending IPCP to end user
-    RADIUSSTART,                  // sending start accounting to RADIUS server
-    RADIUSSTOP,                   // sending stop accounting to RADIUS server
-    RADIUSWAIT                   // waiting timeout before available, in case delayed replies
+       TUNNELFREE,             // Not in use
+       TUNNELOPEN,             // Active tunnel
+       TUNNELDIE,              // Currently closing
+       TUNNELOPENING,          // Busy opening
+       TUNNELUNDEF,            // Undefined
+};
+
+enum
+{
+       RADIUSNULL,             // Not in use
+       RADIUSCHAP,             // sending CHAP down PPP
+       RADIUSAUTH,             // sending auth to RADIUS server
+       RADIUSIPCP,             // sending IPCP to end user
+       RADIUSSTART,            // sending start accounting to RADIUS server
+       RADIUSSTOP,             // sending stop accounting to RADIUS server
+       RADIUSWAIT,             // waiting timeout before available, in case delayed replies
+       RADIUSDEAD,             // errored while talking to radius server.

 };
 
 struct Tstats
 };
 
 struct Tstats


@@ -218,12 +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;


@@ -235,11 +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;
 


@@ -254,9 +339,11 @@ struct Tstats
 
     unsigned long      ip_allocated;
     unsigned long      ip_freed;
 
     unsigned long      ip_allocated;
     unsigned long      ip_freed;

-#ifdef STAT_CALLS
-    unsigned long      call_processtap;
-    unsigned long      call_processarp;
+
+    unsigned long      c_forwarded;
+    unsigned long      recv_forward;
+#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;


@@ -286,17 +373,113 @@ 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
+#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
 #else

+#define CSTAT(x)

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

+struct configt
+{
+       int             debug;                          // debugging level
+       time_t          start_time;                     // time when l2tpns was started
+       char            bandwidth[256];                 // current bandwidth
+       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            tundevice[10];                  // tun device name
+       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;
+
+       unsigned long   rl_rate;                        // default throttle rate
+       int             num_tbfs;                       // number of throttle buckets
+
+       int             save_state;
+       char            accounting_dir[128];
+       ipt             bind_address;
+       ipt             peer_address;
+       int             send_garp;                      // Set to true to garp for vip address on startup
+
+       int             target_uid;
+       int             dump_speed;
+       char            plugins[64][MAXPLUGINS];
+       char            old_plugins[64][MAXPLUGINS];
+
+       int             next_tbf;                       // Next HTB id available to use
+       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.
+                                                       // 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.
+                                                       // 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).
+       int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
+       int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
+       int             cluster_highest_sessionid;
+       int             cluster_highest_tunnelid;
+       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
+#define BGP_NUM_PEERS  2
+       u16             as_number;
+       struct {
+               char    name[64];
+               u16     as;
+               int     keepalive;
+               int     hold;
+       }               neighbour[BGP_NUM_PEERS];
+#endif
+};
+
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC };
+struct config_descriptt
+{
+       char *key;
+       int offset;
+       int size;
+       enum config_typet type;
+};
+

 // arp.c
 void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
 
 // arp.c
 void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
 


@@ -309,85 +492,112 @@ void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l);
 void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 void sendchap(tunnelidt t, sessionidt s);
 void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l);
 void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 void sendchap(tunnelidt t, sessionidt s);

-u8 *makeppp(u8 * b, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
-u8 *findppp(u8 * b, u8 mtype);
+u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);

 void initlcp(tunnelidt t, sessionidt s);
 void initlcp(tunnelidt t, sessionidt s);

-void dumplcp(char *p, int l);
+void send_ipin(sessionidt s, u8 * buf, int len);

 
 
 // radius.c
 void initrad(void);
 
 
 // radius.c
 void initrad(void);

-void radiussend(u8 r, u8 state);
-void processrad(u8 *buf, int len);
-void radiusretry(u8 r);
-u8 radiusnew(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);
+void radiussend(u16 r, u8 state);
+void processrad(u8 *buf, int len, char socket_index);
+void radiusretry(u16 r);
+u16 radiusnew(sessionidt s);
+void radiusclear(u16 r, sessionidt s);

 
 
 // l2tpns.c
 
 
 // l2tpns.c

-clockt now(void);

 clockt backoff(u8 try);
 clockt backoff(u8 try);

-void routeset(ipt ip, ipt mask, ipt gw, u8 add);
-void inittap(void);
-void initudp(void);
-void initdata(void);
-void initippool();

 sessionidt sessionbyip(ipt ip);
 sessionidt sessionbyip(ipt ip);

-/* NB - sessionbyuser ignores walled garden'd sessions */

 sessionidt sessionbyuser(char *username);
 void sessionshutdown(sessionidt s, char *reason);
 sessionidt sessionbyuser(char *username);
 void sessionshutdown(sessionidt s, char *reason);

-void sessionsendarp(sessionidt s);

 void send_garp(ipt ip);
 void send_garp(ipt ip);

-void sessionkill(sessionidt s, char *reason);
-void control16(controlt * c, u16 avp, u16 val, u8 m);
-void control32(controlt * c, u16 avp, u32 val, u8 m);
-void controls(controlt * c, u16 avp, char *val, u8 m);
-void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m);
-controlt *controlnew(u16 mtype);
-void controlnull(tunnelidt t);
-void controladd(controlt * c, tunnelidt t, sessionidt s);

 void tunnelsend(u8 * buf, u16 l, tunnelidt t);
 void tunnelsend(u8 * buf, u16 l, tunnelidt t);

-void tunnelkill(tunnelidt t, char *reason);
-void tunnelshutdown(tunnelidt t, char *reason);

 void sendipcp(tunnelidt t, sessionidt s);
 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 processudp(u8 * buf, int len, struct sockaddr_in *addr);

-void processtap(u8 * buf, int len);
-void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
-ipt assign_ip_address();
-void free_ip_address(ipt address);
-void snoop_send_packet(char *packet, u16 size);
-void dump_acct_info();
-void mainloop(void);
-#define log _log
-#ifndef log_hex
-#define log_hex(a,b,c,d) do{if (a <= debug) _log_hex(a,0,0,0,b,c,d);}while (0)
-#endif
-void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...);
-void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, 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, u8 routes);
-int cluster_send_session(int s);
-int cluster_send_tunnel(int t);
-#ifdef HAVE_LIBCLI
-void init_cli();
-void cli_do(int sockfd);
-#endif
-#ifdef RINGBUFFER
-void ringbuffer_dump(FILE *stream);
-#endif
-void initplugins();
+void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
+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);
+
+#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_hex(int level, const char *title, const char *data, int maxsize);
+
+int sessionsetup(tunnelidt t, sessionidt s);

 int run_plugins(int plugin_type, void *data);
 int run_plugins(int plugin_type, void *data);

-void add_plugin(char *plugin_name);
-void remove_plugin(char *plugin_name);
+void rebuild_address_pool(void);
+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.
+
+
+// cli.c
+void init_cli(char *hostname);
+void cli_do_file(FILE *fh);
+void cli_do(int sockfd);
+int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
+
+
+// icmp.c
+void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
+
+
+extern tunnelt *tunnel;
+extern sessiont *session;
+extern sessioncountt *sess_count;
+extern ippoolt *ip_address_pool;
+#define sessionfree (session[0].next)
+
+#define log_backtrace(count, max) \
+if (count++ < max) { \
+       void *array[20]; \
+       char **strings; \
+       int size, i; \
+       LOG(0, 0, 0, t, "Backtrace follows"); \
+       size = backtrace(array, 10); \
+       strings = backtrace_symbols(array, size); \
+       if (strings) for (i = 0; i < size; i++) \
+       { \
+               LOG(0, 0, 0, t, "%s\n", strings[i]); \
+       } \
+       free(strings); \
+}
+
+
+extern struct configt *config;
+extern time_t basetime;                // Time when this process started.
+extern time_t time_now;                // Seconds since EPOCH.
+extern u32 last_id;
+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__ */