// L2TPNS Global Stuff
-// $Id: l2tpns.h,v 1.1 2003-12-16 07:07:39 fred_nerk Exp $
+// $Id: l2tpns.h,v 1.25 2004-10-30 07:17:41 bodea Exp $
+
+#ifndef __L2TPNS_H__
+#define __L2TPNS_H__
#include <netinet/in.h>
+#include <execinfo.h>
#include <stdio.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <libcli.h>
-#include "config.h"
-
-#define VERSION "1.0"
+#define VERSION "2.0.2"
// Limits
#define MAXTUNNEL 500 // could be up to 65535
#define MAXSESSION 50000 // could be up to 65535
-#define MAXRADIUS 255
+#define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
+
+#define RADIUS_SHIFT 5
+#define RADIUS_MASK ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
+#define MAXRADIUS ((unsigned long)(1L << RADIUS_SHIFT) * 255)
+
+#define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
+#define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
+
#define MAXCONTROL 1000 // max length control message we ever send...
-#define MAXETHER (1500+18) // max packet we try sending to tap
+#define MAXETHER (1500+18) // max packet we try sending to tun
#define MAXTEL 96 // telephone number
+#define MAXPLUGINS 20 // maximum number of plugins to load
#define MAXRADSERVER 10 // max radius servers
#define MAXROUTE 10 // max static routes per session
#define MAXIPPOOL 131072 // max number of ip addresses in pool
#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
-#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 STATEDIR
+#define STATEDIR "/var/lib/l2tpns"
+#endif
+
+#ifndef PLUGINDIR
+#define PLUGINDIR LIBDIR // Plugins
+#endif
+
+#ifndef PLUGINCONF
+#define PLUGINCONF ETCDIR // Plugin config dir
+#endif
+
+#ifndef FLASHDIR
+#define FLASHDIR ETCDIR
+#endif
+
+#ifndef DATADIR
+#define DATADIR STATEDIR
+#endif
+
+#define TUNDEVICE "/dev/net/tun"
+#define STATEFILE DATADIR "/state.dump" // State dump file
+#define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
+#define CLIUSERS FLASHDIR "/users" // CLI Users file
+#define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
#define ACCT_TIME 3000 // 5 minute accounting interval
#define L2TPPORT 1701 // L2TP port
#define RADPORT 1645 // old radius port...
-#define 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 PPPCCP 0x80FD
#define PPPIP 0x0021
#define PPPMP 0x003D
-#define ConfigReq 1
-#define ConfigAck 2
-#define ConfigNak 3
-#define ConfigRej 4
-#define TerminateReq 5
-#define TerminateAck 6
-#define CodeRej 7
-#define ProtocolRej 8
-#define EchoReq 9
-#define EchoReply 10
-#define DiscardRequest 11
-
-#undef TC_TBF
-#define TC_HTB
+#define MIN_IP_SIZE 0x19
+enum
+{
+ ConfigReq = 1,
+ ConfigAck,
+ ConfigNak,
+ ConfigRej,
+ TerminateReq,
+ TerminateAck,
+ CodeRej,
+ ProtocolRej,
+ EchoReq,
+ EchoReply,
+ DiscardRequest,
+ IdentRequest
+};
// Types
typedef unsigned short u16;
typedef u32 clockt;
typedef u8 hasht[16];
+// CLI actions
+struct cli_session_actions {
+ char action;
+ ipt snoop_ip;
+ u16 snoop_port;
+ int throttle;
+};
+
+#define CLI_SESS_KILL 0x01
+#define CLI_SESS_SNOOP 0x02
+#define CLI_SESS_NOSNOOP 0x04
+#define CLI_SESS_THROTTLE 0x08
+#define CLI_SESS_NOTHROTTLE 0x10
+
+struct cli_tunnel_actions {
+ char action;
+};
+
+#define CLI_TUN_KILL 0x01
+
+// dump header: update number if internal format changes
+#define DUMP_MAGIC "L2TPNS#" VERSION "#"
+
// structures
typedef struct routes // route
{
typedef struct controls // control message
{
- struct controls *next; // next in queue
+ struct controls *next; // next in queue
u16 length; // length
u8 buf[MAXCONTROL];
}
controlt;
-typedef struct stbft
-{
- struct stbft *next;
- char handle[10];
- char in_use;
- int mark;
-} tbft;
-
-
-// 336 bytes per session
typedef struct sessions
{
- sessionidt next; // next session in linked list
- sessionidt far; // far end session ID
- tunnelidt tunnel; // tunnel ID
- ipt ip; // IP of session set by RADIUS response
- unsigned long sid; // session id for hsddb
- u16 nr; // next receive
- u16 ns; // next send
- u32 magic; // ppp magic number
- u32 cin, cout; // byte counts
- u32 pin, pout; // packet counts
- u32 id; // session id
- clockt opened; // when started
- clockt die; // being closed, when to finally free
- time_t last_packet; // Last packet from the user (used for idle timeouts)
- ipt dns1, dns2; // DNS servers
- routet route[MAXROUTE]; // static routes
- u8 radius; // which radius session is being used (0 for not waiting on authentication)
- u8 flags; // various bit flags
- u8 snoop; // are we snooping this session?
- u8 throttle; // is this session throttled?
- u8 walled_garden; // is this session stuck in the walled garden?
- u16 mru; // maximum receive unit
- u16 tbf; // filter bucket for throttling
+ sessionidt next; // next session in linked list
+ sessionidt far; // far end session ID
+ tunnelidt tunnel; // near end tunnel ID
+ ipt ip; // IP of session set by RADIUS response (host byte order).
+ int ip_pool_index; // index to IP pool
+ unsigned long unique_id; // unique session id
+ u16 nr; // next receive
+ u16 ns; // next send
+ u32 magic; // ppp magic number
+ u32 cin, cout; // byte counts
+ u32 pin, pout; // packet counts
+ u32 total_cin; // This counter is never reset while a session is open
+ u32 total_cout; // This counter is never reset while a session is open
+ u32 id; // session id
+ u32 throttle; // non-zero if this session is throttled.
+ clockt opened; // when started
+ clockt die; // being closed, when to finally free
+ time_t last_packet; // Last packet from the user (used for idle timeouts)
+ ipt dns1, dns2; // DNS servers
+ routet route[MAXROUTE]; // static routes
+ u16 radius; // which radius session is being used (0 for not waiting on authentication)
+ u16 mru; // maximum receive unit
+ u16 tbf_in; // filter bucket for throttling in from the user.
+ u16 tbf_out; // filter bucket for throttling out to the user.
+ u8 l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel.
+ u8 reserved_old_snoop; // No longer used - remove at some time
+ u8 walled_garden; // is this session gardened?
+ u8 flags1; // additional flags (currently unused);
char random_vector[MAXTEL];
int random_vector_length;
- char user[129]; // user (needed in seesion for radius stop messages)
- char called[MAXTEL]; // called number
- char calling[MAXTEL]; // calling number
- unsigned long tx_connect_speed;
- unsigned long rx_connect_speed;
+ char user[129]; // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
+ char called[MAXTEL]; // called number
+ char calling[MAXTEL]; // calling number
+ u32 tx_connect_speed;
+ u32 rx_connect_speed;
+ u32 flags; // Various session flags.
+ ipt snoop_ip; // Interception destination IP
+ u16 snoop_port; // Interception destination port
+ u16 sid; // near end session id.
+ char reserved[20]; // Space to expand structure without changing HB_VERSION
}
sessiont;
+#define SF_IPCP_ACKED (1<<0) // Has this session seen an IPCP Ack?
+
+typedef struct {
+ u32 cin;
+ u32 cout;
+} sessioncountt;
+
#define SESSIONPFC 1 // PFC negotiated flags
#define SESSIONACFC 2 // ACFC negotiated flags
+#define SESSIONLCPACK 4 // LCP negotiated
// 168 bytes per tunnel
typedef struct tunnels
{
- tunnelidt next; // next tunnel in linked list
tunnelidt far; // far end tunnel ID
ipt ip; // Ip for far end
portt port; // port for far end
u16 window; // Rx window
u16 nr; // next receive
u16 ns; // next send
+ int state; // current state (tunnelstate enum)
clockt last; // when last control message sent (used for resend timeout)
clockt retry; // when to try resenting pending control
clockt die; // being closed, when to finally free
+ clockt 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
tunnelt;
// 180 bytes per radius session
-typedef struct radiuss // outstanding RADIUS requests
+typedef struct radiuss // outstanding RADIUS requests
{
- u8 next; // next in free list
- sessionidt session; // which session this applies to
- hasht auth; // request authenticator
- clockt retry; // ehwne to try next
- char calling[MAXTEL]; // calling number
- char pass[129]; // password
- u8 id; // ID for PPP response
- u8 try; // which try we are on
- u8 state; // state of radius requests
- u8 chap; // set if CHAP used (is CHAP identifier)
+ sessionidt session; // which session this applies to
+ hasht auth; // request authenticator
+ clockt retry; // when to try next
+ char calling[MAXTEL]; // calling number
+ char pass[129]; // password
+ u8 id; // ID for PPP response
+ u8 try; // which try we are on
+ u8 state; // state of radius requests
+ u8 chap; // set if CHAP used (is CHAP identifier)
}
radiust;
typedef struct
{
- ipt address;
- char assigned; // 1 if assigned, 0 if free
+ ipt address; // Host byte order..
+ char assigned; // 1 if assigned, 0 if free
+ sessionidt session;
+ clockt last; // last used
+ char user[129]; // user (try to have ip addresses persistent)
}
ippoolt;
};
#endif
+/*
+ * Possible tunnel states
+ * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
+ */
+enum
+{
+ TUNNELFREE, // Not in use
+ TUNNELOPEN, // Active tunnel
+ TUNNELDIE, // Currently closing
+ TUNNELOPENING, // Busy opening
+ TUNNELUNDEF, // Undefined
+};
+
enum
{
- RADIUSNULL, // Not in use
- RADIUSCHAP, // sending CHAP down PPP
- RADIUSAUTH, // sending auth to RADIUS server
- RADIUSIPCP, // sending IPCP to end user
- RADIUSSTART, // sending start accounting to RADIUS server
- RADIUSSTOP, // sending stop accounting to RADIUS server
- RADIUSWAIT // waiting timeout before available, in case delayed replies
+ RADIUSNULL, // Not in use
+ RADIUSCHAP, // sending CHAP down PPP
+ RADIUSAUTH, // sending auth to RADIUS server
+ RADIUSIPCP, // sending IPCP to end user
+ RADIUSSTART, // sending start accounting to RADIUS server
+ RADIUSSTOP, // sending stop accounting to RADIUS server
+ RADIUSWAIT, // waiting timeout before available, in case delayed replies
+ RADIUSDEAD, // errored while talking to radius server.
};
struct Tstats
time_t start_time;
time_t last_reset;
- unsigned long tap_rx_packets;
- unsigned long tap_tx_packets;
- unsigned long tap_rx_bytes;
- unsigned long tap_tx_bytes;
- unsigned long tap_rx_errors;
- unsigned long tap_tx_errors;
+ unsigned long tun_rx_packets;
+ unsigned long tun_tx_packets;
+ unsigned long tun_rx_bytes;
+ unsigned long tun_tx_bytes;
+ unsigned long tun_rx_errors;
+ unsigned long tun_tx_errors;
unsigned long tunnel_rx_packets;
unsigned long tunnel_tx_packets;
unsigned long tunnel_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 ip_allocated;
unsigned long ip_freed;
-#ifdef STAT_CALLS
- unsigned long call_processtap;
- unsigned long call_processarp;
+
+ unsigned long c_forwarded;
+ unsigned long recv_forward;
+#ifdef STATISTICS
+ unsigned long call_processtun;
unsigned long call_processipout;
unsigned long call_processudp;
unsigned long call_sessionbyip;
};
#ifdef STATISTICS
-#define STAT(x) _statistics->x++
-#define INC_STAT(x,y) _statistics->x += y
-#define GET_STAT(x) _statistics->x
-#define SET_STAT(x, y) _statistics->x = y
+
+#ifdef STAT_CALLS
+#define CSTAT(x) STAT(x)
#else
+#define CSTAT(x)
+#endif
+
+#define STAT(x) (_statistics->x++)
+#define INC_STAT(x,y) (_statistics->x += (y))
+#define GET_STAT(x) (_statistics->x)
+#define SET_STAT(x, y) (_statistics->x = (y))
+#else
+#define CSTAT(x)
#define STAT(x)
#define INC_STAT(x,y)
#define GET_STAT(x) 0
#define SET_STAT(x, y)
#endif
+struct configt
+{
+ int debug; // debugging level
+ time_t start_time; // time when l2tpns was started
+ char bandwidth[256]; // current bandwidth
+ char pid_file[256]; // file to write PID to on startup
+ int wrote_pid;
+ clockt current_time; // 1/10ths of a second since the process started.
+ // means that we can only run a given process
+ // for 13 years without re-starting!
+
+ char config_file[128];
+ int reload_config; // flag to re-read config (set by cli)
+ int cleanup_interval; // interval between regular cleanups (in seconds)
+ int multi_read_count; // amount of packets to read per fd in processing loop
+
+ char tundevice[10]; // tun device name
+ char log_filename[128];
+ char l2tpsecret[64];
+
+ char radiussecret[64];
+ int radius_accounting;
+ ipt radiusserver[MAXRADSERVER]; // radius servers
+ u16 radiusport[MAXRADSERVER]; // radius base ports
+ u8 numradiusservers; // radius server count
+ short num_radfds; // Number of radius filehandles allocated
+
+ ipt default_dns1, default_dns2;
+
+ unsigned long rl_rate; // throttle rate
+ int num_tbfs; // number of throttle buckets
+
+ int save_state;
+ char accounting_dir[128];
+ ipt bind_address;
+ int send_garp; // Set to true to garp for vip address on startup
+
+ int target_uid;
+ int dump_speed;
+ char plugins[64][MAXPLUGINS];
+ char old_plugins[64][MAXPLUGINS];
+
+ int next_tbf; // Next HTB id available to use
+ int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling policy for this process.
+ int lock_pages; // Lock pages into memory.
+ int icmp_rate; // Max number of ICMP unreachable per second to send>
+
+ u32 cluster_address; // Multicast address of cluster.
+ // Send to this address to have everyone hear.
+ char cluster_interface[64]; // Which interface to listen for multicast on.
+ int cluster_iam_master; // Are we the cluster master???
+ int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
+ u32 cluster_master_address; // The network address of the cluster master.
+ // Zero if i am the cluster master.
+ int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
+ // (or the seq number we're next expecting if we're a slave).
+ int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
+ int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
+ int cluster_highest_sessionid;
+ int cluster_highest_tunnelid;
+ clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
+ int cluster_num_changes; // Number of changes queued.
+
+ int cluster_hb_interval; // How often to send a heartbeat.
+ int cluster_hb_timeout; // How many missed heartbeats trigger an election.
+
+#ifdef BGP
+ u16 as_number;
+ char bgp_peer[2][64];
+ u16 bgp_peer_as[2];
+#endif
+};
+
+struct config_descriptt
+{
+ char *key;
+ int offset;
+ int size;
+ enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC } type;
+};
+
// arp.c
void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
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 *makeppp(u8 * b, int size, 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 dumplcp(u8 *p, int l);
// radius.c
void initrad(void);
-void radiussend(u8 r, u8 state);
-void processrad(u8 *buf, int len);
-void radiusretry(u8 r);
-u8 radiusnew(sessionidt s);
-
-// throttle.c
-int throttle_session(sessionidt s, int throttle);
-
-
-// rl.c
-void init_rl();
-u16 rl_create_tbf();
-u16 rl_get_tbf();
-void rl_done_tbf(u16 t);
-void rl_destroy_tbf(u16 t);
+void radiussend(u16 r, u8 state);
+void processrad(u8 *buf, int len, char socket_index);
+void radiusretry(u16 r);
+u16 radiusnew(sessionidt s);
+void radiusclear(u16 r, sessionidt s);
// l2tpns.c
clockt now(void);
clockt backoff(u8 try);
-void routeset(ipt ip, ipt mask, ipt gw, u8 add);
-void inittap(void);
+void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);
+void inittun(void);
void initudp(void);
-void initdata(void);
+void initdata(int optdebug, char *optconfig);
void initippool();
sessionidt sessionbyip(ipt ip);
-/* NB - sessionbyuser ignores walled garden'd sessions */
sessionidt sessionbyuser(char *username);
void sessionshutdown(sessionidt s, char *reason);
void sessionsendarp(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 processtun(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);
+int assign_ip_address(sessionidt s);
+void free_ip_address(sessionidt s);
+void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
void dump_acct_info();
void mainloop(void);
+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);
+
#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)
+#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(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));
void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize);
void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
-int sessionsetup(tunnelidt t, sessionidt s, u8 routes);
+int sessionsetup(tunnelidt t, sessionidt s);
int cluster_send_session(int s);
int cluster_send_tunnel(int t);
-#ifdef HAVE_LIBCLI
-void init_cli();
+int cluster_send_goodbye();
+void init_cli(char *hostname);
+void cli_do_file(FILE *fh);
void cli_do(int sockfd);
-#endif
+int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
#ifdef RINGBUFFER
void ringbuffer_dump(FILE *stream);
#endif
-void initplugins();
+void initplugins(void);
int run_plugins(int plugin_type, void *data);
void add_plugin(char *plugin_name);
void remove_plugin(char *plugin_name);
+void plugins_done(void);
+void tunnelclear(tunnelidt t);
+void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
+void fix_address_pool(int sid);
+void rebuild_address_pool(void);
+void send_ipin(sessionidt s, u8 * buf, int len);
+int throttle_session(sessionidt s, int throttle);
+int load_session(sessionidt, sessiont *);
+void become_master(void); // We're the master; kick off any required master initializations.
+extern tunnelt *tunnel;
+extern sessiont *session;
+extern sessioncountt *sess_count;
+extern ippoolt *ip_address_pool;
+#define sessionfree (session[0].next)
+
+#define log_backtrace(count, max) \
+if (count++ < max) { \
+ void *array[20]; \
+ char **strings; \
+ int size, i; \
+ log(0, 0, 0, t, "Backtrace follows"); \
+ size = backtrace(array, 10); \
+ strings = backtrace_symbols(array, size); \
+ if (strings) for (i = 0; i < size; i++) \
+ { \
+ log(0, 0, 0, t, "%s\n", strings[i]); \
+ } \
+ free(strings); \
+}
+
+
+extern struct configt *config;
+extern time_t basetime; // Time when this process started.
+extern time_t time_now; // Seconds since EPOCH.
+extern u32 last_id;
+extern struct Tstats *_statistics;
+extern ipt my_address;
+extern int tun_write(u8 *data, int size);
+
+
+#define TIME (config->current_time)
+
+// macros for handling help in cli commands
+#define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
+#define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
+
+// CVS identifiers (for "show version file")
+extern char const *cvs_id_arp;
+extern char const *cvs_id_cli;
+extern char const *cvs_id_cluster;
+extern char const *cvs_id_constants;
+extern char const *cvs_id_control;
+extern char const *cvs_id_icmp;
+extern char const *cvs_id_l2tpns;
+extern char const *cvs_id_ll;
+extern char const *cvs_id_md5;
+extern char const *cvs_id_ppp;
+extern char const *cvs_id_radius;
+extern char const *cvs_id_tbf;
+extern char const *cvs_id_util;
+
+#endif /* __L2TPNS_H__ */
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