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

[l2tpns.git] / l2tpns.h

diff --git a/l2tpns.h b/l2tpns.h
index 8272525..f2f686f 100644 (file)
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -1,19 +1,43 @@
 // L2TPNS Global Stuff
 // L2TPNS Global Stuff

-// $Id: l2tpns.h,v 1.4 2004/04/16 02:33:32 fred_nerk Exp $
+// $Id: l2tpns.h,v 1.91 2005/09/16 05:04:29 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 "config.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>

 
 

-#define VERSION        "1.1.2"
+#define VERSION        "2.1.7"

 
 // 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 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        MAXCONTROL      1000            // max length control message we ever send...

-#define        MAXETHER        (1500+18)       // max packet we try sending to tap
+#define MINMTU         576             // minimum recommended MTU (rfc1063)
+#define PPPMTU         1500            // default PPP MTU
+#define MAXMTU         2600            // arbitrary maximum MTU
+#define        MAXETHER        (MAXMTU+18)     // max packet we try sending to tun

 #define        MAXTEL          96              // telephone number
 #define        MAXTEL          96              // telephone number

+#define MAXUSER                128             // username
+#define MAXPASS                128             // password

 #define MAXPLUGINS     20              // maximum number of plugins to load
 #define MAXRADSERVER   10              // max radius servers
 #define        MAXROUTE        10              // max static routes per session
 #define MAXPLUGINS     20              // maximum number of plugins to load
 #define MAXRADSERVER   10              // max radius servers
 #define        MAXROUTE        10              // max static routes per session


@@ -22,38 +46,54 @@
 #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 TAPDEVICE      "/dev/net/tun"
-#define        UDP             17
-#define HOMEDIR                "/home/l2tpns/"                 // Base dir for data
-#define STATEFILE      "/tmp/l2tpns.dump"              // State dump file
-#define NOSTATEFILE    "/tmp/l2tpns.no_state_reload"   // If exists, state will not be reloaded
-#define CONFIGFILE     ETCDIR "/l2tpns.cfg"            // Configuration file
-#define CLIUSERS       ETCDIR "/l2tpns.users"          // CLI Users file
-#define IPPOOLFILE     ETCDIR "/l2tpns.ip_pool"        // Address pool configuration
+#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)
+
+#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        PPPPAP          0xC023
 #define        PPPCHAP         0xC223
 #define        PPPLCP          0xC021
 #define        PPPIPCP         0x8021

+#define        PPPIPV6CP       0x8057

 #define        PPPCCP          0x80FD
 #define PPPIP          0x0021
 #define        PPPCCP          0x80FD
 #define PPPIP          0x0021

+#define PPPIPV6                0x0057

 #define PPPMP          0x003D
 #define PPPMP          0x003D

-enum
-{
+#define MIN_IP_SIZE    0x19
+
+enum {

        ConfigReq = 1,
        ConfigAck,
        ConfigNak,
        ConfigReq = 1,
        ConfigAck,
        ConfigNak,


@@ -64,99 +104,223 @@ enum
        ProtocolRej,
        EchoReq,
        EchoReply,
        ProtocolRej,
        EchoReq,
        EchoReply,

-       DiscardRequest
+       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
+
+// 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];
-
-// dump header: update number if internal format changes
-#define DUMP_MAGIC "L2TPNS#" VERSION "#"
+typedef uint16_t sessionidt;
+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;
+       in_addr_t mask;

 }
 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
+       uint8_t buf[MAXCONTROL];

 }
 controlt;
 
 }
 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

 {
        sessionidt next;                // next session in linked list
        sessionidt far;                 // far end session ID
 {
        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
+       tunnelidt tunnel;               // near end tunnel ID
+       uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
+       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
+               uint8_t pad;            // unused
+       } ppp;
+       in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).

        int ip_pool_index;              // index to IP pool
        int ip_pool_index;              // index to IP pool

-       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 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
+       uint32_t unique_id;             // unique session id
+       uint16_t nr;                    // next receive
+       uint16_t ns;                    // next send
+       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 mru;                   // maximum receive unit

        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)

-       ipt dns1, dns2;                 // DNS servers
+       in_addr_t dns1, dns2;           // DNS servers

        routet route[MAXROUTE];         // static routes
        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 gardened?
-       u16 mru;                        // maximum receive unit
-       u16 tbf;                        // filter bucket for throttling
-       char random_vector[MAXTEL];
+       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)
+       uint8_t random_vector[MAXTEL];
+       char user[MAXUSER];             // user (needed in seesion for radius stop messages)

        char called[MAXTEL];            // called number
        char calling[MAXTEL];           // calling number
        char called[MAXTEL];            // called number
        char calling[MAXTEL];           // calling number

-       unsigned long tx_connect_speed;
-       unsigned long rx_connect_speed;
+       uint32_t tx_connect_speed;
+       uint32_t rx_connect_speed;
+       in_addr_t snoop_ip;             // Interception destination IP
+       uint16_t snoop_port;            // Interception destination port
+       uint8_t walled_garden;          // is this session gardened?
+       uint8_t ipv6prefixlen;          // IPv6 route prefix length
+       struct in6_addr ipv6route;      // Static IPv6 route
+       char reserved[11];              // Space to expand structure without changing HB_VERSION

 }
 sessiont;
 
 }
 sessiont;
 

-#define        SESSIONPFC      1            // PFC negotiated flags
-#define        SESSIONACFC     2           // ACFC negotiated flags
+#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;
+
+       // authentication to use
+       int lcp_authtype;
+
+       // our MRU
+       uint16_t ppp_mru;
+
+       // 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;
+} sessionlocalt;
+
+#define        SESSIONPFC      1       // PFC negotiated flags
+#define        SESSIONACFC     2       // ACFC negotiated flags

 
 // 168 bytes per tunnel
 
 // 168 bytes per tunnel

-typedef struct tunnels
+typedef struct

 {
        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 retry;           // when to try resenting pending control
        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


@@ -164,34 +328,34 @@ typedef struct tunnels
        clockt lastrec;         // when the last control message was received
        char hostname[128];     // tunnel hostname
        char vendor[128];       // LAC vendor
        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
-       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
 }
 tunnelt;
 
        controlt *controls;     // oldest message
        controlt *controle;     // newest message
 }
 tunnelt;
 

-// 180 bytes per radius session
-typedef struct radiuss          // outstanding RADIUS requests
+// 160 bytes per radius session
+typedef struct                 // outstanding RADIUS requests

 {
 {

-       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)
+       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)

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

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


@@ -202,7 +366,6 @@ 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;


@@ -219,7 +382,8 @@ enum
        TUNNELFREE,             // Not in use
        TUNNELOPEN,             // Active tunnel
        TUNNELDIE,              // Currently closing
        TUNNELFREE,             // Not in use
        TUNNELOPEN,             // Active tunnel
        TUNNELDIE,              // Currently closing

-       TUNNELOPENING           // Busy opening
+       TUNNELOPENING,          // Busy opening
+       TUNNELUNDEF,            // Undefined

 };
 
 enum
 };
 
 enum


@@ -227,236 +391,431 @@ enum
        RADIUSNULL,             // Not in use
        RADIUSCHAP,             // sending CHAP down PPP
        RADIUSAUTH,             // sending auth to RADIUS server
        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
        RADIUSSTART,            // sending start accounting to RADIUS server
        RADIUSSTOP,             // sending stop accounting to RADIUS server

-       RADIUSWAIT              // waiting timeout before available, in case delayed replies
+       RADIUSINTERIM,          // sending interim accounting to RADIUS server
+       RADIUSWAIT,             // waiting timeout before available, in case delayed replies

 };
 
 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
 

-struct configt
+typedef struct

 {
        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

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

        char            log_filename[128];
        char            log_filename[128];

-       char            l2tpsecret[64];
+
+       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;
 
        char            radiussecret[64];
        int             radius_accounting;

-       ipt             radiusserver[MAXRADSERVER];     // radius servers
-       u8              numradiusservers;               // radius server count
+       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;                // local port for radius dae

 
 

-       ipt             default_dns1, default_dns2;
+       char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
+       int             radius_authtypes;
+       int             radius_authprefer;

 
 

-       ipt             snoop_destination_host;
-       u16             snoop_destination_port;
+       int             allow_duplicate_users;          // allow multiple logins with the same username
+
+       in_addr_t       default_dns1, default_dns2;
+
+       unsigned long   rl_rate;                        // default throttle rate
+       int             num_tbfs;                       // number of throttle buckets

 
 

-       unsigned long   rl_rate;
-       int             save_state;
-       uint32_t        cluster_address;
-       int             ignore_cluster_updates;

        char            accounting_dir[128];
        char            accounting_dir[128];

-       ipt             bind_address;
+       in_addr_t       bind_address;
+       in_addr_t       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             target_uid;
        int             dump_speed;
        char            plugins[64][MAXPLUGINS];
        char            old_plugins[64][MAXPLUGINS];

-};

 
 

-struct config_descriptt
+       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
+
+       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_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_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.
+
+#ifdef BGP
+#define BGP_NUM_PEERS  2
+       uint16_t as_number;
+       struct {
+               char name[64];
+               uint16_t as;
+               int keepalive;
+               int hold;
+       } neighbour[BGP_NUM_PEERS];
+#endif
+} configt;
+
+enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
+typedef struct

 {
        char *key;
        int offset;
        int size;
 {
        char *key;
        int offset;
        int size;

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

 
 // arp.c
 
 // arp.c

-void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
+void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);

 
 
 // ppp.c
 
 
 // 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);
+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 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 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);
+void sendlcp(sessionidt s, tunnelidt t);
+void send_ipin(sessionidt s, uint8_t *buf, int len);
+void sendccp(sessionidt s, tunnelidt t);

 
 
 // 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);
-void radiusclear(u8 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);
+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);

 
 
 // 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);
+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);
-int assign_ip_address(sessionidt s);
-void free_ip_address(sessionidt s);
-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 <= config->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);
-int cluster_send_goodbye();
-void init_cli();
+void sessionshutdown(sessionidt s, char *reason, int result, int error);
+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 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);
+
+#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(char *hostname);

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

-#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);
-void tunnelclear(tunnelidt t);
-void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
+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 sessiont *session;
 
 extern tunnelt *tunnel;
 extern sessiont *session;

+extern sessionlocalt *sess_local;
+extern ippoolt *ip_address_pool;

 #define sessionfree (session[0].next)
 #define sessionfree (session[0].next)

+
+#define log_backtrace(count, max) \
+if (count++ < max) { \
+       void *array[20]; \
+       char **strings; \
+       int size, i; \
+       LOG(0, 0, t, "Backtrace follows:\n"); \
+       size = backtrace(array, 10); \
+       strings = backtrace_symbols(array, size); \
+       if (strings) for (i = 0; i < size; i++) \
+       { \
+               LOG(0, 0, t, " %s\n", strings[i]); \
+       } \
+       free(strings); \
+}
+
+
+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,
+       } 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)
+
+// 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__ */