Update changelog (LAC functionnality)

[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index afbfe3f..0d07ae3 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,189 +1,483 @@
 // 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 1.121 2009-12-08 14:49:28 bodea Exp $
+
+#ifndef __L2TPNS_H__
+#define __L2TPNS_H__

 
 #include <netinet/in.h>
 #include <stdio.h>
 
 #include <netinet/in.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        "2.2.1"

 
 // Limits
 #define MAXTUNNEL      500             // 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        MAXCONTROL      1000            // max length control message we ever send...
-#define        MAXETHER        (1500+18)       // max packet we try sending to tap
-#define        MAXTEL          96              // telephone number
+#define MAXBUNDLE      300             // could be up to 65535
+#define MAXBUNDLESES   12              // Maximum number of member links in bundle
+#define MAXADDRESS     20              // Maximum length for the Endpoint Discrminiator address
+#define MAXSESSION     60000           // could be up to 65535
+#define MAXTBFS                6000            // Maximum token bucket filters. Might need up to 2 * session.
+
+#define RADIUS_SHIFT   6
+#define RADIUS_FDS     (1 << RADIUS_SHIFT)
+#define RADIUS_MASK    ((1 << RADIUS_SHIFT) - 1)
+#define MAXRADIUS      (1 << (8 + RADIUS_SHIFT))
+
+#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 MINMTU         576             // minimum recommended MTU (rfc1063)
+#define MAXMTU         2600            // arbitrary maximum MTU
+#define PPPoE_MRU      1492            // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
+#define MAXETHER       (MAXMTU+18)     // max packet we try sending to tun
+#define MAXTEL         96              // telephone number
+#define MAXHOSTNAME    256             // hostname
+#define MAXUSER                128             // username
+#define MAXPASS                128             // password
+#define MAXCLASS       128             // radius class attribute size
+#define MAXPLUGINS     20              // maximum number of plugins to load

 #define MAXRADSERVER   10              // max radius servers
 #define MAXRADSERVER   10              // max radius servers

-#define        MAXROUTE        10              // max static routes per session
+#define MAXROUTE       10              // max static routes per session

 #define MAXIPPOOL      131072          // max number of ip addresses in pool
 #define RINGBUFFER_SIZE        10000           // Number of ringbuffer entries to allocate
 #define MAX_LOG_LENGTH 512             // Maximum size of log message
 #define MAXIPPOOL      131072          // max number of ip addresses in pool
 #define RINGBUFFER_SIZE        10000           // Number of ringbuffer entries to allocate
 #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 ECHO_TIMEOUT   10              // Time between last packet sent and LCP ECHO generation
+#define IDLE_ECHO_TIMEOUT      240             // Time between last packet seen and session shutdown
+#define BUSY_WAIT_TIME 3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
+
+#define MP_BEGIN        0x80            // This value is used when (b)egin bit is set in MP header
+#define MP_END          0x40            // This value is used when (e)nd bit is set in MP header
+#define MP_BOTH_BITS    0xC0            // This value is used when both bits (begin and end) are set in MP header
+
+#define MINFRAGLEN     64              // Minumum fragment length
+#define MAXFRAGLEN     1496    // Maximum length for Multilink fragment (The multilink may contain only one link)
+#define MAXFRAGNUM     512             // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
+                                       // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
+#define        MAXFRAGNUM_MASK 511             // Must be equal to MAXFRAGNUM-1

 
 // 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
 

-#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        PPPPAP          0xC023
-#define        PPPCHAP         0xC223
-#define        PPPLCP          0xC021
-#define        PPPIPCP         0x8021
-#define        PPPCCP          0x80FD
+#ifndef PLUGINDIR
+#define PLUGINDIR      LIBDIR          // Plugins
+#endif
+
+#ifndef PLUGINCONF
+#define PLUGINCONF     ETCDIR          // Plugin config dir
+#endif
+
+#ifndef FLASHDIR
+#define FLASHDIR       ETCDIR
+#endif
+
+#define TUNDEVICE      "/dev/net/tun"
+#define RANDOMDEVICE   "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
+#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 ACCT_SHUT_TIME 600                             // 1 minute for counters of shutdown sessions
+#define L2TPPORT       1701                            // L2TP port
+#define RADPORT                1645                            // old radius port...
+#define DAEPORT                3799                            // DAE port
+#define PKTARP         0x0806                          // ARP packet type
+#define PKTIP          0x0800                          // IPv4 packet type
+#define PKTIPV6                0x86DD                          // IPv6 packet type
+#define PPPPAP         0xC023
+#define PPPCHAP                0xC223
+#define PPPLCP         0xC021
+#define PPPIPCP                0x8021
+#define PPPIPV6CP      0x8057
+#define PPPCCP         0x80FD

 #define PPPIP          0x0021
 #define PPPIP          0x0021

+#define PPPIPV6                0x0057

 #define PPPMP          0x003D
 #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
+};
+
+enum {
+       AccessRequest = 1,
+       AccessAccept,
+       AccessReject,
+       AccountingRequest,
+       AccountingResponse,
+       AccessChallenge = 11,
+       DisconnectRequest = 40,
+       DisconnectACK,
+       DisconnectNAK,
+       CoARequest,
+       CoAACK,
+       CoANAK
+};
+
+// PPP phases
+enum {
+       Dead,
+       Establish,
+       Authenticate,
+       Network,
+       Terminate
+};
+
+// PPP states
+enum {
+       Initial,
+       Starting,
+       Closed,
+       Stopped,
+       Closing,
+       Stopping,
+       RequestSent,
+       AckReceived,
+       AckSent,
+       Opened
+};
+
+// reset state machine counters
+#define initialise_restart_count(_s, _fsm)                     \
+       sess_local[_s]._fsm.conf_sent =                         \
+       sess_local[_s]._fsm.nak_sent = 0
+
+// no more attempts
+#define zero_restart_count(_s, _fsm) ({                                \
+       sess_local[_s]._fsm.conf_sent =                         \
+               config->ppp_max_configure;                      \
+       sess_local[_s]._fsm.restart =                           \
+               time_now + config->ppp_restart_time;            \
+})
+
+// increment ConfReq counter and reset timer
+#define restart_timer(_s, _fsm) ({                             \
+       sess_local[_s]._fsm.conf_sent++;                        \
+       sess_local[_s]._fsm.restart =                           \
+               time_now + config->ppp_restart_time;            \
+})
+
+// stop timer on change to state where timer does not run
+#define change_state(_s, _fsm, _new) ({                                \
+       if (_new != session[_s].ppp._fsm)                       \
+       {                                                       \
+               switch (_new)                                   \
+               {                                               \
+               case Initial:                                   \
+               case Starting:                                  \
+               case Closed:                                    \
+               case Stopped:                                   \
+               case Opened:                                    \
+                       sess_local[_s]._fsm.restart = 0;        \
+                       initialise_restart_count(_s, _fsm);     \
+               }                                               \
+               session[_s].ppp._fsm = _new;                    \
+               cluster_send_session(_s);                       \
+       }                                                       \
+})

 
 // Types
 
 // Types

-typedef unsigned short u16;
-typedef unsigned int u32;
-typedef unsigned char u8;
-typedef u32 ipt;
-typedef u16 portt;
-typedef u16 sessionidt;
-typedef u16 tunnelidt;
-typedef u32 clockt;
-typedef u8 hasht[16];
+typedef uint16_t sessionidt;
+typedef uint16_t bundleidt;
+typedef uint16_t tunnelidt;
+typedef uint32_t clockt;
+typedef uint8_t hasht[16];
+
+// CLI actions
+struct cli_session_actions {
+       char action;
+       in_addr_t snoop_ip;
+       uint16_t snoop_port;
+       int throttle_in;
+       int throttle_out;
+       int filter_in;
+       int filter_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
+#define CLI_SESS_FILTER                0x20
+#define CLI_SESS_NOFILTER      0x40
+
+struct cli_tunnel_actions {
+       char action;
+};
+
+#define CLI_TUN_KILL           0x01

 
 // structures
 
 // structures

-typedef struct routes           // route
+typedef struct                 // route

 {
 {

-       ipt ip;
-       ipt mask;
+       in_addr_t ip;
+       int prefixlen;

 }
 routet;
 
 }
 routet;
 

-typedef struct controls         // control message
+typedef struct controls                // control message

 {
 {

-       struct controls *next;       // next in queue
-       u16 length;             // length
-       u8 buf[MAXCONTROL];
+       struct controls *next;  // next in queue
+       uint16_t length;        // length
+       union {
+               uint8_t buf[MAXCONTROL];
+               uint16_t buf16[MAXCONTROL/2];
+       } __attribute__ ((__transparent_union__));

 }
 controlt;
 
 }
 controlt;
 

-typedef struct stbft
-{
-    struct stbft *next;
-    char handle[10];
-    char in_use;
-    int mark;
-} tbft;
-
+typedef struct {
+       uint8_t length;                 // Endpoint Discriminator length
+       uint8_t addr_class;             // Endpoint Discriminator class
+       uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
+} epdist;
+
+typedef struct {
+       sessionidt sid;                 // Fragment originating session
+       tunnelidt tid;                  // Fragment originating tunnel
+       uint8_t flags;                  // MP frame flags
+       uint32_t seq;                   // fragment seq num
+       uint32_t jitteravg;
+        uint16_t length;                // Fragment length
+        uint8_t data[MAXFRAGLEN];       // Fragment data
+} fragmentt;

 
 

-// 336 bytes per session
-typedef struct sessions
+typedef struct

 {
 {

-       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
-       char random_vector[MAXTEL];
+       sessionidt next;                // next session in linked list
+       sessionidt far;                 // far end session ID
+       tunnelidt tunnel;               // near end tunnel ID
+       uint8_t flags;                  // session flags: see SESSION_*
+       struct {
+               uint8_t phase;          // PPP phase
+               uint8_t lcp:4;          //   LCP    state
+               uint8_t ipcp:4;         //   IPCP   state
+               uint8_t ipv6cp:4;       //   IPV6CP state
+               uint8_t ccp:4;          //   CCP    state
+       } ppp;
+       uint16_t mru;                   // maximum receive unit
+       in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
+       int ip_pool_index;              // index to IP pool
+       uint32_t unique_id;             // unique session id
+       uint32_t magic;                 // ppp magic number
+       uint32_t pin, pout;             // packet counts
+       uint32_t cin, cout;             // byte counts
+       uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
+       uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
+       uint16_t throttle_in;           // upstream throttle rate (kbps)
+       uint16_t throttle_out;          // downstream throttle rate
+       uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
+       uint8_t filter_out;             // output filter index
+       uint16_t snoop_port;            // Interception destination port
+       in_addr_t snoop_ip;             // Interception destination IP
+       clockt opened;                  // when started
+       clockt die;                     // being closed, when to finally free
+       uint32_t session_timeout;       // Maximum session time in seconds
+       uint32_t idle_timeout;          // Maximum idle time in seconds
+       time_t last_packet;             // Last packet from the user (used for idle timeouts)
+       time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
+       in_addr_t dns1, dns2;           // DNS servers
+       routet route[MAXROUTE];         // static routes
+       uint16_t tbf_in;                // filter bucket for throttling in from the user.
+       uint16_t tbf_out;               // filter bucket for throttling out to the user.

        int random_vector_length;
        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;
+       uint8_t random_vector[MAXTEL];
+       char user[MAXUSER];             // user (needed in session for radius stop messages)
+       char called[MAXTEL];            // called number
+       char calling[MAXTEL];           // calling number
+       uint32_t tx_connect_speed;
+       uint32_t rx_connect_speed;
+       clockt timeout;                 // Session timeout
+       uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
+       epdist epdis;                   // Multilink Endpoint Discriminator
+       bundleidt bundle;               // Multilink Bundle Identifier
+       uint8_t mssf;                   // Multilink Short Sequence Number Header Format
+       uint8_t walled_garden;          // is this session gardened?
+       uint8_t classlen;               // class (needed for radius accounting messages)
+       char class[MAXCLASS];
+       uint8_t ipv6prefixlen;          // IPv6 route prefix length
+       struct in6_addr ipv6route;      // Static IPv6 route
+#ifdef LAC
+       sessionidt forwardtosession;    // LNS id_session to forward
+       char reserved[10];              // Space to expand structure without changing HB_VERSION
+#else
+       char reserved[12];              // Space to expand structure without changing HB_VERSION
+#endif

 }
 sessiont;
 
 }
 sessiont;
 

-#define        SESSIONPFC      1            // PFC negotiated flags
-#define        SESSIONACFC     2           // ACFC negotiated flags
+typedef struct
+{
+        int state;                              // current state (bundlestate enum)
+        uint32_t seq_num_t;                     // Sequence Number (transmission)
+        uint32_t timeout;                       // Session-Timeout for bundle
+       uint32_t max_seq;                       // Max value of sequence number field
+        uint8_t num_of_links;                   // Number of links joint to this bundle
+        uint32_t online_time;                   // The time this bundle is online
+        clockt last_check;                      // Last time the timeout is checked
+        uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
+        uint8_t mssf;                           // Multilink Short Sequence Number Header Format
+        epdist epdis;                           // Multilink Endpoint Discriminator
+        char user[MAXUSER];                     // Needed for matching member links
+        sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
+        sessionidt members[MAXBUNDLESES];       // Array for member links sessions
+}
+bundlet;
+
+typedef struct
+{
+        fragmentt fragment[MAXFRAGNUM];
+        uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
+        uint16_t re_frame_len;                  // The reassembled frame length
+       uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
+       uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
+       uint32_t M;                             // Minumum frame sequence number received over all bundle members
+       uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
+}
+fragmentationt;
+
+#define AUTHPAP                1       // allow PAP
+#define AUTHCHAP       2       // allow CHAP
+
+typedef struct
+{
+       // packet counters
+       uint32_t pin;
+       uint32_t pout;
+
+       // byte counters
+       uint32_t cin;
+       uint32_t cout;
+
+       // PPP restart timer/counters
+       struct {
+               time_t restart;
+               int conf_sent;
+               int nak_sent;
+       } lcp, ipcp, ipv6cp, ccp;
+
+       // identifier for Protocol-Reject, Code-Reject
+       uint8_t lcp_ident;

 
 

-// 168 bytes per tunnel
-typedef struct tunnels
+       // authentication to use
+       int lcp_authtype;
+
+       // our MRU
+       uint16_t ppp_mru;
+
+       // our MRRU
+       uint16_t mp_mrru;
+
+       // our mssf
+       uint16_t mp_mssf;
+
+       // our Endpoint Discriminator
+       in_addr_t mp_epdis;
+
+       // DoS prevention
+       clockt last_packet_out;
+       uint32_t packets_out;
+       uint32_t packets_dropped;
+
+       // RADIUS session in use
+       uint16_t radius;
+
+       // interim RADIUS
+       time_t last_interim;
+
+       // last LCP Echo
+       time_t last_echo;
+
+       // Last Multilink frame sequence number received
+       uint32_t last_seq;
+
+       // jitter average of the session
+       uint32_t jitteravg;
+       // time in milliseconds of the last fragment.
+       uint64_t prev_time;
+} sessionlocalt;
+
+// session flags
+#define SESSION_PFC    (1 << 0)        // use Protocol-Field-Compression
+#define SESSION_ACFC   (1 << 1)        // use Address-and-Control-Field-Compression
+#define SESSION_STARTED        (1 << 2)        // RADIUS Start record sent
+
+// 328 bytes per tunnel
+typedef struct

 {
 {

-       tunnelidt next;         // next tunnel in linked list

        tunnelidt far;          // far end tunnel ID
        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
+       in_addr_t ip;           // Ip for far end
+       uint16_t port;          // port for far end
+       uint16_t window;        // Rx window
+       uint16_t nr;            // next receive
+       uint16_t ns;            // next send
+       int state;              // current state (tunnelstate enum)

        clockt last;            // when last control message sent (used for resend timeout)
        clockt last;            // when last control message sent (used for resend timeout)

-       clockt retry;           // when to try resenting pending control
+       clockt retry;           // when to try resending pending control

        clockt die;             // being closed, when to finally free
        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
        char hostname[128];     // tunnel hostname
        char vendor[128];       // LAC vendor

-       u8 try;                 // number of retrys on a control message
-       u16 controlc;           // outstaind messages in queue
+       uint8_t try;            // number of retrys on a control message
+       uint16_t controlc;      // outstaind messages in queue

        controlt *controls;     // oldest message
        controlt *controle;     // newest message
        controlt *controls;     // oldest message
        controlt *controle;     // newest message

+#ifdef LAC
+       uint16_t isremotelns;   // != 0 if the tunnel is to remote LNS (== index on the conf remote lns)
+       char reserved[14];              // Space to expand structure without changing HB_VERSION
+#else
+       char reserved[16];              // Space to expand structure without changing HB_VERSION
+#endif

 }
 tunnelt;
 
 }
 tunnelt;
 

-// 180 bytes per radius session
-typedef struct radiuss          // outstanding RADIUS requests
+// 164 bytes per radius session
+typedef struct                 // 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 pass[129];         // password
+       uint8_t id;             // ID for PPP response
+       uint8_t try;            // which try we are on
+       uint8_t state;          // state of radius requests
+       uint8_t chap;           // set if CHAP used (is CHAP identifier)
+       uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
+       char const *term_msg;   //   terminate reason

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

-       ipt     address;
-       char    assigned;       // 1 if assigned, 0 if free
+       in_addr_t       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;
 


@@ -194,7 +488,6 @@ struct Tringbuffer
                char level;
                sessionidt session;
                tunnelidt tunnel;
                char level;
                sessionidt session;
                tunnelidt tunnel;

-               ipt address;

                char message[MAX_LOG_LENGTH];
        } buffer[RINGBUFFER_SIZE];
        int head;
                char message[MAX_LOG_LENGTH];
        } buffer[RINGBUFFER_SIZE];
        int head;


@@ -202,192 +495,523 @@ 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
+{
+       BUNDLEFREE,             // Not in use
+       BUNDLEOPEN,             // Active bundle
+       BUNDLEUNDEF,            // Undefined
+};
+
+enum
+{
+       NULLCLASS = 0,          //End Point Discriminator classes
+       LOCALADDR,
+       IPADDR,
+       IEEEMACADDR,
+       PPPMAGIC,
+       PSNDN,
+};
+
+enum
+{
+       RADIUSNULL,             // Not in use
+       RADIUSCHAP,             // sending CHAP down PPP
+       RADIUSAUTH,             // sending auth to RADIUS server
+       RADIUSSTART,            // sending start accounting to RADIUS server
+       RADIUSSTOP,             // sending stop accounting to RADIUS server
+       RADIUSINTERIM,          // sending interim accounting to RADIUS server
+       RADIUSWAIT,             // waiting timeout before available, in case delayed replies
+       RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning

 };
 
 struct Tstats
 {
 };
 
 struct Tstats
 {

-    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      tunnel_rx_packets;
-    unsigned long      tunnel_tx_packets;
-    unsigned long      tunnel_rx_bytes;
-    unsigned long      tunnel_tx_bytes;
-    unsigned long      tunnel_rx_errors;
-    unsigned long      tunnel_tx_errors;
-
-    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_recv;
-
-    unsigned long      packets_snooped;
-
-    unsigned long      tunnel_created;
-    unsigned long      session_created;
-    unsigned long      tunnel_timeout;
-    unsigned long      session_timeout;
-    unsigned long      radius_timeout;
-    unsigned long      radius_overflow;
-    unsigned long      tunnel_overflow;
-    unsigned long      session_overflow;
-
-    unsigned long      ip_allocated;
-    unsigned long      ip_freed;
-#ifdef STAT_CALLS
-    unsigned long      call_processtap;
-    unsigned long      call_processarp;
-    unsigned long      call_processipout;
-    unsigned long      call_processudp;
-    unsigned long      call_sessionbyip;
-    unsigned long      call_sessionbyuser;
-    unsigned long      call_sendarp;
-    unsigned long      call_sendipcp;
-    unsigned long      call_tunnelsend;
-    unsigned long      call_sessionkill;
-    unsigned long      call_sessionshutdown;
-    unsigned long      call_tunnelkill;
-    unsigned long      call_tunnelshutdown;
-    unsigned long      call_assign_ip_address;
-    unsigned long      call_free_ip_address;
-    unsigned long      call_dump_acct_info;
-    unsigned long      call_sessionsetup;
-    unsigned long      call_processpap;
-    unsigned long      call_processchap;
-    unsigned long      call_processlcp;
-    unsigned long      call_processipcp;
-    unsigned long      call_processipin;
-    unsigned long      call_processccp;
-    unsigned long      call_sendchap;
-    unsigned long      call_processrad;
-    unsigned long      call_radiussend;
-    unsigned long      call_radiusretry;
+    time_t     start_time;
+    time_t     last_reset;
+
+    uint32_t   tun_rx_packets;
+    uint32_t   tun_tx_packets;
+    uint32_t   tun_rx_bytes;
+    uint32_t   tun_tx_bytes;
+    uint32_t   tun_rx_errors;
+    uint32_t   tun_tx_errors;
+    uint32_t   tun_rx_dropped;
+
+    uint32_t   tunnel_rx_packets;
+    uint32_t   tunnel_tx_packets;
+    uint32_t   tunnel_rx_bytes;
+    uint32_t   tunnel_tx_bytes;
+    uint32_t   tunnel_rx_errors;
+    uint32_t   tunnel_tx_errors;
+
+    uint32_t   tunnel_retries;
+    uint32_t   radius_retries;
+
+    uint32_t   arp_sent;
+
+    uint32_t   packets_snooped;
+
+    uint32_t   tunnel_created;
+    uint32_t   session_created;
+    uint32_t   tunnel_timeout;
+    uint32_t   session_timeout;
+    uint32_t   radius_timeout;
+    uint32_t   radius_overflow;
+    uint32_t   tunnel_overflow;
+    uint32_t   session_overflow;
+
+    uint32_t   ip_allocated;
+    uint32_t   ip_freed;
+
+    uint32_t   c_forwarded;
+    uint32_t   recv_forward;
+
+    uint32_t   select_called;
+    uint32_t   multi_read_used;
+    uint32_t   multi_read_exceeded;
+
+#ifdef STATISTICS
+    uint32_t   call_processtun;
+    uint32_t   call_processipout;
+    uint32_t   call_processipv6out;
+    uint32_t   call_processudp;
+    uint32_t   call_sessionbyip;
+    uint32_t   call_sessionbyipv6;
+    uint32_t   call_sessionbyuser;
+    uint32_t   call_sendarp;
+    uint32_t   call_sendipcp;
+    uint32_t   call_sendipv6cp;
+    uint32_t   call_processipv6cp;
+    uint32_t   call_tunnelsend;
+    uint32_t   call_sessionkill;
+    uint32_t   call_sessionshutdown;
+    uint32_t   call_tunnelkill;
+    uint32_t   call_tunnelshutdown;
+    uint32_t   call_assign_ip_address;
+    uint32_t   call_free_ip_address;
+    uint32_t   call_dump_acct_info;
+    uint32_t   call_sessionsetup;
+    uint32_t   call_processpap;
+    uint32_t   call_processchap;
+    uint32_t   call_processlcp;
+    uint32_t   call_processipcp;
+    uint32_t   call_processipin;
+    uint32_t   call_processipv6in;
+    uint32_t   call_processccp;
+    uint32_t   call_sendchap;
+    uint32_t   call_processrad;
+    uint32_t   call_radiussend;
+    uint32_t   call_radiusretry;
+    uint32_t    call_random_data;

 #endif
 };
 
 #ifdef STATISTICS
 #endif
 };
 
 #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(call_ ## 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
 

-// arp.c
-void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
+#ifndef IFNAMSIZ
+# define IFNAMSIZ 16
+#endif

 
 

+typedef struct
+{
+       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             multi_read_count;               // amount of packets to read per fd in processing loop
+
+       char            tundevice[IFNAMSIZ];            // tun device name
+       char            log_filename[128];
+
+       char            l2tp_secret[64];                // L2TP shared secret
+       int             l2tp_mtu;                       // MTU of interface used for L2TP
+
+       char            random_device[256];             // random device path, defaults to RANDOMDEVICE
+
+       int             ppp_restart_time;               // timeout for PPP restart
+       int             ppp_max_configure;              // max lcp configure requests to send
+       int             ppp_max_failure;                // max lcp configure naks to send
+
+       char            radiussecret[64];
+       int             radius_accounting;
+       int             radius_interim;
+       in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
+       uint16_t        radiusport[MAXRADSERVER];       // radius base ports
+       uint8_t         numradiusservers;               // radius server count
+
+       uint16_t        radius_dae_port;                // port for radius DAE
+       uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
+       uint16_t        radius_bind_max;
+
+       char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
+       int             radius_authtypes;
+       int             radius_authprefer;
+
+       int             allow_duplicate_users;          // allow multiple logins with the same username
+       int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
+
+       in_addr_t       default_dns1, default_dns2;
+
+       unsigned long   rl_rate;                        // default throttle rate
+       int             num_tbfs;                       // number of throttle buckets
+
+       char            accounting_dir[128];
+       in_addr_t       bind_address;
+       in_addr_t       peer_address;
+       int             send_garp;                      // Set to true to garp for vip address on startup
+
+       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
+       int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
+       char            epdis_addr[20];                 // MP Endpoint Discriminator address
+
+       in_addr_t       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.
+       in_addr_t       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_bundles;      // How many bundles 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_bundleid;
+       int             cluster_highest_tunnelid;
+       clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
+       int             cluster_last_hb_ver;            // Heartbeat version last seen from master
+       int             cluster_num_changes;            // Number of changes queued.
+
+       int             cluster_mcast_ttl;              // TTL for multicast packets
+       int             cluster_hb_interval;            // How often to send a heartbeat.
+       int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
+       uint64_t        cluster_table_version;          // # state changes processed by cluster
+
+       struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
+
+
+       int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
+                                                       // slaves is less than this value.
+       in_addr_t       cli_bind_address;               // bind address for CLI
+       char            hostname[MAXHOSTNAME];  // hostname (overridden by -h on command line)
+       // Guest change
+       char            guest_user[MAXUSER];            // Guest account username
+
+#ifdef BGP
+#define BGP_NUM_PEERS  2
+       uint16_t as_number;
+       struct {
+               char name[64];
+               uint16_t as;
+               int keepalive;
+               int hold;
+               struct in_addr update_source;
+       } neighbour[BGP_NUM_PEERS];
+       in_addr_t       nexthop_address;
+       struct in6_addr nexthop6_address;
+#endif

 
 

-// ppp.c
-void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l);
-void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l);
-void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
-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);
-u8 *makeppp(u8 * b, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
-u8 *findppp(u8 * b, u8 mtype);
-void initlcp(tunnelidt t, sessionidt s);
-void dumplcp(char *p, int l);
+       int echo_timeout; // Time between last packet sent and LCP ECHO generation
+       int idle_echo_timeout; // Time between last packet seen and
+                                                  // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
+       in_addr_t iftun_address;
+#ifdef LAC
+       int disable_lac_func;
+       int highest_rlnsid;
+       uint16_t bind_portremotelns;
+       in_addr_t bind_address_remotelns;
+#endif
+} configt;
+
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
+typedef struct
+{
+       char *key;
+       int offset;
+       int size;
+       enum config_typet type;
+} config_descriptt;

 
 

+typedef struct
+{
+       uint8_t op;     // operation
+#define FILTER_PORT_OP_NONE    0 // all ports match
+#define FILTER_PORT_OP_EQ      1
+#define FILTER_PORT_OP_NEQ     2
+#define FILTER_PORT_OP_GT      3
+#define FILTER_PORT_OP_LT      4
+#define FILTER_PORT_OP_RANGE   5
+       uint16_t port;  // port (host byte order)
+       uint16_t port2; // range
+} ip_filter_portt;

 
 

-// 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);
+typedef struct
+{
+       int action;             // permit/deny
+#define FILTER_ACTION_DENY     1
+#define FILTER_ACTION_PERMIT   2
+       uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
+       in_addr_t src_ip;       // source ip (network byte order)
+       in_addr_t src_wild;
+       ip_filter_portt src_ports;
+       in_addr_t dst_ip;       // dest ip
+       in_addr_t dst_wild;
+       ip_filter_portt dst_ports;
+       uint8_t frag;           // apply to non-initial fragments
+       uint8_t tcp_flag_op;    // match type: any, all, established
+#define FILTER_FLAG_OP_ANY     1
+#define FILTER_FLAG_OP_ALL     2
+#define FILTER_FLAG_OP_EST     3
+       uint8_t tcp_sflags;     // flags set
+       uint8_t tcp_cflags;     // flags clear
+       uint32_t counter;       // match count
+} ip_filter_rulet;
+
+#define TCP_FLAG_FIN   0x01
+#define TCP_FLAG_SYN   0x02
+#define TCP_FLAG_RST   0x04
+#define TCP_FLAG_PSH   0x08
+#define TCP_FLAG_ACK   0x10
+#define TCP_FLAG_URG   0x20
+
+#define MAXFILTER              32
+#define MAXFILTER_RULES                32
+typedef struct
+{
+       char name[32];          // ACL name
+       int extended;           // type: 0 = standard, 1 = extended
+       ip_filter_rulet rules[MAXFILTER_RULES];
+       int used;               // session ref count
+} ip_filtert;
+
+// CDN result/error codes
+#define CDN_NONE                       0, 0
+#define CDN_TRY_ANOTHER                        2, 7
+#define CDN_ADMIN_DISC                 3, 0
+#define CDN_UNAVAILABLE                        4, 0
+
+// RADIUS Acct-Terminate-Cause values
+#define TERM_USER_REQUEST              1
+#define TERM_LOST_CARRIER              2
+#define TERM_LOST_SERVICE              3
+#define TERM_IDLE_TIMEOUT              4
+#define TERM_SESSION_TIMEOUT           5
+#define TERM_ADMIN_RESET               6
+#define TERM_ADMIN_REBOOT              7
+#define TERM_PORT_ERROR                        8
+#define TERM_NAS_ERROR                 9
+#define TERM_NAS_REQUEST               10
+#define TERM_NAS_REBOOT                        11
+#define TERM_PORT_UNNEEDED             12
+#define TERM_PORT_PREEMPTED            13
+#define TERM_PORT_SUSPENDED            14
+#define TERM_SERVICE_UNAVAILABLE       15
+#define TERM_CALLBACK                  16
+#define TERM_USER_ERROR                        17
+#define TERM_HOST_REQUEST              18
+#define TERM_SUPPLICANT_RESTART                19
+#define TERM_REAUTHENTICATION_FAILURE  20
+#define TERM_PORT_REINIT               21
+#define TERM_PORT_DISABLED             22
+
+// on slaves, alow BGP to withdraw cleanly before exiting
+#define QUIT_DELAY     5
+
+// quit actions (master)
+#define QUIT_FAILOVER  1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
+#define QUIT_SHUTDOWN  2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
+
+// arp.c
+void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);

 
 

-// throttle.c
-int throttle_session(sessionidt s, int throttle);

 
 

+// ppp.c
+void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void lcp_open(sessionidt s, tunnelidt t);
+void lcp_restart(sessionidt s);
+void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
+void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
+void sendchap(sessionidt s, tunnelidt t);
+uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
+void sendlcp(sessionidt s, tunnelidt t);
+void send_ipin(sessionidt s, uint8_t *buf, int len);
+void sendccp(sessionidt s, tunnelidt t);
+void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
+int join_bundle(sessionidt s);

 
 

-// 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);

 
 

+// radius.c
+void initrad(void);
+void radiussend(uint16_t r, uint8_t state);
+void processrad(uint8_t *buf, int len, char socket_index);
+void radiusretry(uint16_t r);
+uint16_t radiusnew(sessionidt s);
+void radiusclear(uint16_t r, sessionidt s);
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
+#ifdef LAC
+int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, const char *radiussecret, const uint8_t * auth);
+#endif

 
 // l2tpns.c
 
 // l2tpns.c

-clockt now(void);
-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);
-/* NB - sessionbyuser ignores walled garden'd sessions */
+clockt backoff(uint8_t try);
+void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
+void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
+sessionidt sessionbyip(in_addr_t ip);
+sessionidt sessionbyipv6(struct in6_addr ip);

 sessionidt sessionbyuser(char *username);
 sessionidt sessionbyuser(char *username);

-void sessionshutdown(sessionidt s, char *reason);
-void sessionsendarp(sessionidt s);
-void send_garp(ipt ip);
+void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
+void random_data(uint8_t *buf, int len);

 void sessionkill(sessionidt s, char *reason);
 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 tunnelkill(tunnelidt t, char *reason);
-void tunnelshutdown(tunnelidt t, char *reason);
-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 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)
+void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
+void filter_session(sessionidt s, int filter_in, int filter_out);
+void send_garp(in_addr_t ip);
+void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
+int tun_write(uint8_t *data, int size);
+void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
+void sendipcp(sessionidt s, tunnelidt t);
+void sendipv6cp(sessionidt s, tunnelidt t);
+void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
+void processipout(uint8_t *buf, int len);
+void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
+int find_filter(char const *name, size_t len);
+int ip_filter(uint8_t *buf, int len, uint8_t filter);
+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);
+#ifdef LAC
+tunnelidt lac_new_tunnel();
+void lac_tunnelclear(tunnelidt t);
+void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len);
+void lac_send_ICRQ(tunnelidt t, sessionidt s);
+void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg);

 #endif
 #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
+
+#undef LOG
+#undef LOG_HEX
+#define LOG(D, s, t, f, ...)   ({ if (D <= config->debug) _log(D, 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, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
+void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
+
+
+int sessionsetup(sessionidt s, tunnelidt t);
+int run_plugins(int plugin_type, void *data);
+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();
 void init_cli();

+void cli_init_complete(char *hostname);
+void cli_do_file(FILE *fh);

 void cli_do(int sockfd);
 void cli_do(int sockfd);

+int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
+
+
+// icmp.c
+void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
+
+
+extern tunnelt *tunnel;
+extern bundlet *bundle;
+extern sessiont *session;
+extern sessionlocalt *sess_local;
+extern ippoolt *ip_address_pool;
+#define sessionfree (session[0].next)
+
+
+extern configt *config;
+extern time_t basetime;                // Time when this process started.
+extern time_t time_now;                // Seconds since EPOCH.
+extern char main_quit;
+extern uint32_t last_id;
+extern struct Tstats *_statistics;
+extern in_addr_t my_address;
+extern int clifd;
+extern int epollfd;
+
+struct event_data {
+       enum {
+               FD_TYPE_CLI,
+               FD_TYPE_CLUSTER,
+               FD_TYPE_TUN,
+               FD_TYPE_UDP,
+               FD_TYPE_CONTROL,
+               FD_TYPE_DAE,
+               FD_TYPE_RADIUS,
+               FD_TYPE_BGP,
+               FD_TYPE_NETLINK,
+#ifdef LAC
+               FD_TYPE_UDPLAC,

 #endif
 #endif

-#ifdef RINGBUFFER
-void ringbuffer_dump(FILE *stream);
-#endif
-void initplugins();
-int run_plugins(int plugin_type, void *data);
-void add_plugin(char *plugin_name);
-void remove_plugin(char *plugin_name);
+       } type;
+       int index; // for RADIUS, BGP
+};
+
+#define TIME (config->current_time)
+
+extern uint16_t MRU;
+extern uint16_t MSS;
+
+// 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)
+
+#endif /* __L2TPNS_H__ */