l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.10 2004-07-07 09:09:53 bodea Exp $
   3
   4 #ifndef __L2TPNS_H__
   5 #define __L2TPNS_H__
   6
   7 #include <netinet/in.h>
   8 #include <execinfo.h>
   9 #include <stdio.h>
  10 #include <signal.h>
  11 #include <stdlib.h>
  12 #include <netinet/in.h>
  13 #include <sys/socket.h>
  14 #include <arpa/inet.h>
  15 #include <sys/types.h>
  16 #include <libcli.h>
  17
  18 #define VERSION "2.0.0"
  19
  20 // Limits
  21 #define MAXTUNNEL       500             // could be up to 65535
  22 #define MAXSESSION      50000           // could be up to 65535
  23 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  24
  25 #define RADIUS_SHIFT    5
  26 #define RADIUS_MASK     ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
  27 #define MAXRADIUS       ((2 << (RADIUS_SHIFT - 1)) * 255)
  28
  29 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  30 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  31
  32 #define MAXCONTROL      1000            // max length control message we ever send...
  33 #define MAXETHER        (1500+18)       // max packet we try sending to tap
  34 #define MAXTEL          96              // telephone number
  35 #define MAXPLUGINS      20              // maximum number of plugins to load
  36 #define MAXRADSERVER    10              // max radius servers
  37 #define MAXROUTE        10              // max static routes per session
  38 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  39 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  40 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  41 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  42 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  43
  44 // Constants
  45 #include "config.h"
  46 #ifndef PLUGINDIR
  47 #define PLUGINDIR       LIBDIR                  // Plugins
  48 #endif
  49
  50 #ifndef PLUGINCONF
  51 #define PLUGINCONF      ETCDIR                  // Plugin config dir
  52 #endif
  53
  54 #ifndef DATADIR
  55 #define DATADIR         "/tmp"
  56 #endif
  57
  58 #ifndef FLASHDIR
  59 #define FLASHDIR        ETCDIR
  60 #endif
  61
  62 #define TAPDEVICE       "/dev/net/tun"
  63 #define STATEFILE       DATADIR "/state.dump"           // State dump file
  64 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  65 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  66 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  67 #define ACCT_TIME       3000            // 5 minute accounting interval
  68 #define L2TPPORT        1701            // L2TP port
  69 #define RADPORT         1645            // old radius port...
  70 #define RADAPORT        1646            // old radius accounting port
  71 #define PKTARP          0x0806          // ARP packet type
  72 #define PKTIP           0x0800          // IP packet type
  73 #define PSEUDOMAC       0x0200          // pseudo MAC prefix (local significant MAC)
  74 #define PPPPAP          0xC023
  75 #define PPPCHAP         0xC223
  76 #define PPPLCP          0xC021
  77 #define PPPIPCP         0x8021
  78 #define PPPCCP          0x80FD
  79 #define PPPIP           0x0021
  80 #define PPPMP           0x003D
  81 #define MIN_IP_SIZE     0x19
  82 enum
  83 {
  84         ConfigReq = 1,
  85         ConfigAck,
  86         ConfigNak,
  87         ConfigRej,
  88         TerminateReq,
  89         TerminateAck,
  90         CodeRej,
  91         ProtocolRej,
  92         EchoReq,
  93         EchoReply,
  94         DiscardRequest
  95 };
  96
  97 // Types
  98 typedef unsigned short u16;
  99 typedef unsigned int u32;
 100 typedef unsigned char u8;
 101 typedef u32 ipt;
 102 typedef u16 portt;
 103 typedef u16 sessionidt;
 104 typedef u16 tunnelidt;
 105 typedef u32 clockt;
 106 typedef u8 hasht[16];
 107
 108 // dump header: update number if internal format changes
 109 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 110
 111 // structures
 112 typedef struct routes           // route
 113 {
 114         ipt ip;
 115         ipt mask;
 116 }
 117 routet;
 118
 119 typedef struct controls         // control message
 120 {
 121         struct controls *next;  // next in queue
 122         u16 length;             // length
 123         u8 buf[MAXCONTROL];
 124 }
 125 controlt;
 126
 127 typedef struct sessions
 128 {
 129         sessionidt next;                // next session in linked list
 130         sessionidt far;                 // far end session ID
 131         tunnelidt tunnel;               // tunnel ID
 132         ipt ip;                         // IP of session set by RADIUS response (host byte order).
 133         int ip_pool_index;              // index to IP pool
 134         unsigned long sid;              // session id for hsddb
 135         u16 nr;                         // next receive
 136         u16 ns;                         // next send
 137         u32 magic;                      // ppp magic number
 138         u32 cin, cout;                  // byte counts
 139         u32 pin, pout;                  // packet counts
 140         u32 total_cin;                  // This counter is never reset while a session is open
 141         u32 total_cout;                 // This counter is never reset while a session is open
 142         u32 id;                         // session id
 143         u32 throttle;                   // non-zero if this session is throttled.
 144         clockt opened;                  // when started
 145         clockt die;                     // being closed, when to finally free
 146         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 147         ipt dns1, dns2;                 // DNS servers
 148         routet route[MAXROUTE];         // static routes
 149         u16 radius;                     // which radius session is being used (0 for not waiting on authentication)
 150         u16 mru;                        // maximum receive unit
 151         u16 tbf_in;                     // filter bucket for throttling in from the user.
 152         u16 tbf_out;                    // filter bucket for throttling out to the user.
 153         u8 l2tp_flags;                  // various bit flags from the ICCN on the l2tp tunnel.
 154         u8 walled_garden;               // is this session gardened?
 155         u8 flags1;                      // additional flags (currently unused);
 156         char random_vector[MAXTEL];
 157         int random_vector_length;
 158         char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
 159         char called[MAXTEL];            // called number
 160         char calling[MAXTEL];           // calling number
 161         u32 tx_connect_speed;
 162         u32 rx_connect_speed;
 163         u32 flags;                      // Various session flags.
 164         ipt snoop_ip;                   // Interception destination IP
 165         u16 snoop_port;                 // Interception destination port
 166         char reserved[28];              // Space to expand structure without changing HB_VERSION
 167 }
 168 sessiont;
 169
 170 #define SF_IPCP_ACKED   (1<<0)          // Has this session seen an IPCP Ack?
 171
 172 typedef struct {
 173         u32     cin;
 174         u32     cout;
 175 } sessioncountt;
 176
 177 #define SESSIONPFC      1            // PFC negotiated flags
 178 #define SESSIONACFC     2           // ACFC negotiated flags
 179
 180 // 168 bytes per tunnel
 181 typedef struct tunnels
 182 {
 183         tunnelidt far;          // far end tunnel ID
 184         ipt ip;                 // Ip for far end
 185         portt port;             // port for far end
 186         u16 window;             // Rx window
 187         u16 nr;                 // next receive
 188         u16 ns;                 // next send
 189         int state;              // current state (tunnelstate enum)
 190         clockt last;            // when last control message sent (used for resend timeout)
 191         clockt retry;           // when to try resenting pending control
 192         clockt die;             // being closed, when to finally free
 193         clockt lastrec;         // when the last control message was received
 194         char hostname[128];     // tunnel hostname
 195         char vendor[128];       // LAC vendor
 196         u8 try;                 // number of retrys on a control message
 197         u16 controlc;           // outstaind messages in queue
 198         controlt *controls;     // oldest message
 199         controlt *controle;     // newest message
 200 }
 201 tunnelt;
 202
 203 // 180 bytes per radius session
 204 typedef struct radiuss          // outstanding RADIUS requests
 205 {
 206         sessionidt session;     // which session this applies to
 207         hasht auth;             // request authenticator
 208         clockt retry;           // when to try next
 209         char calling[MAXTEL];   // calling number
 210         char pass[129];         // password
 211         u8 id;                  // ID for PPP response
 212         u8 try;                 // which try we are on
 213         u8 state;               // state of radius requests
 214         u8 chap;                // set if CHAP used (is CHAP identifier)
 215 }
 216 radiust;
 217
 218 typedef struct
 219 {
 220         ipt             address;        // Host byte order..
 221         char            assigned;       // 1 if assigned, 0 if free
 222         sessionidt      session;
 223         clockt          last;           // last used
 224         char            user[129];      // user (try to have ip addresses persistent)
 225 }
 226 ippoolt;
 227
 228 #ifdef RINGBUFFER
 229 struct Tringbuffer
 230 {
 231         struct {
 232                 char level;
 233                 sessionidt session;
 234                 tunnelidt tunnel;
 235                 ipt address;
 236                 char message[MAX_LOG_LENGTH];
 237         } buffer[RINGBUFFER_SIZE];
 238         int head;
 239         int tail;
 240 };
 241 #endif
 242
 243 /*
 244  * Possible tunnel states
 245  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 246  */
 247 enum
 248 {
 249         TUNNELFREE,             // Not in use
 250         TUNNELOPEN,             // Active tunnel
 251         TUNNELDIE,              // Currently closing
 252         TUNNELOPENING,          // Busy opening
 253         TUNNELUNDEF,            // Undefined
 254 };
 255
 256 enum
 257 {
 258         RADIUSNULL,             // Not in use
 259         RADIUSCHAP,             // sending CHAP down PPP
 260         RADIUSAUTH,             // sending auth to RADIUS server
 261         RADIUSIPCP,             // sending IPCP to end user
 262         RADIUSSTART,            // sending start accounting to RADIUS server
 263         RADIUSSTOP,             // sending stop accounting to RADIUS server
 264         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 265         RADIUSDEAD,             // errored while talking to radius server.
 266 };
 267
 268 struct Tstats
 269 {
 270     time_t              start_time;
 271     time_t              last_reset;
 272
 273     unsigned long       tap_rx_packets;
 274     unsigned long       tap_tx_packets;
 275     unsigned long       tap_rx_bytes;
 276     unsigned long       tap_tx_bytes;
 277     unsigned long       tap_rx_errors;
 278     unsigned long       tap_tx_errors;
 279
 280     unsigned long       tunnel_rx_packets;
 281     unsigned long       tunnel_tx_packets;
 282     unsigned long       tunnel_rx_bytes;
 283     unsigned long       tunnel_tx_bytes;
 284     unsigned long       tunnel_rx_errors;
 285     unsigned long       tunnel_tx_errors;
 286
 287     unsigned long       tunnel_retries;
 288     unsigned long       radius_retries;
 289
 290     unsigned long       arp_errors;
 291     unsigned long       arp_replies;
 292     unsigned long       arp_discarded;
 293     unsigned long       arp_sent;
 294     unsigned long       arp_recv;
 295
 296     unsigned long       packets_snooped;
 297
 298     unsigned long       tunnel_created;
 299     unsigned long       session_created;
 300     unsigned long       tunnel_timeout;
 301     unsigned long       session_timeout;
 302     unsigned long       radius_timeout;
 303     unsigned long       radius_overflow;
 304     unsigned long       tunnel_overflow;
 305     unsigned long       session_overflow;
 306
 307     unsigned long       ip_allocated;
 308     unsigned long       ip_freed;
 309
 310     unsigned long       c_forwarded;
 311     unsigned long       recv_forward;
 312 #ifdef STATISTICS
 313     unsigned long       call_processtap;
 314     unsigned long       call_processarp;
 315     unsigned long       call_processipout;
 316     unsigned long       call_processudp;
 317     unsigned long       call_sessionbyip;
 318     unsigned long       call_sessionbyuser;
 319     unsigned long       call_sendarp;
 320     unsigned long       call_sendipcp;
 321     unsigned long       call_tunnelsend;
 322     unsigned long       call_sessionkill;
 323     unsigned long       call_sessionshutdown;
 324     unsigned long       call_tunnelkill;
 325     unsigned long       call_tunnelshutdown;
 326     unsigned long       call_assign_ip_address;
 327     unsigned long       call_free_ip_address;
 328     unsigned long       call_dump_acct_info;
 329     unsigned long       call_sessionsetup;
 330     unsigned long       call_processpap;
 331     unsigned long       call_processchap;
 332     unsigned long       call_processlcp;
 333     unsigned long       call_processipcp;
 334     unsigned long       call_processipin;
 335     unsigned long       call_processccp;
 336     unsigned long       call_sendchap;
 337     unsigned long       call_processrad;
 338     unsigned long       call_radiussend;
 339     unsigned long       call_radiusretry;
 340 #endif
 341 };
 342
 343 #ifdef STATISTICS
 344
 345 #ifdef STAT_CALLS
 346 #define CSTAT(x)        STAT(x)
 347 #else
 348 #define CSTAT(x)
 349 #endif
 350
 351 #define STAT(x)         (_statistics->x++)
 352 #define INC_STAT(x,y)   (_statistics->x += (y))
 353 #define GET_STAT(x)     (_statistics->x)
 354 #define SET_STAT(x, y)  (_statistics->x = (y))
 355 #else
 356 #define CSTAT(x)
 357 #define STAT(x)
 358 #define INC_STAT(x,y)
 359 #define GET_STAT(x)     0
 360 #define SET_STAT(x, y)
 361 #endif
 362
 363 struct configt
 364 {
 365         int             debug;                          // debugging level
 366         time_t          start_time;                     // time when l2tpns was started
 367         char            bandwidth[256];                 // current bandwidth
 368         clockt          current_time;                   // 1/10ths of a second since the process started.
 369                                                         // means that we can only run a given process
 370                                                         // for 13 years without re-starting!
 371
 372         char            config_file[128];
 373         int             reload_config;                  // flag to re-read config (set by cli)
 374         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 375         int             multi_read_count;               // amount of packets to read per fd in processing loop
 376
 377         char            tapdevice[10];                  // tap device name
 378         char            log_filename[128];
 379         char            l2tpsecret[64];
 380
 381         char            radiussecret[64];
 382         int             radius_accounting;
 383         ipt             radiusserver[MAXRADSERVER];     // radius servers
 384         u8              numradiusservers;               // radius server count
 385         short           num_radfds;                     // Number of radius filehandles allocated
 386
 387         ipt             default_dns1, default_dns2;
 388
 389         unsigned long   rl_rate;
 390         int             save_state;
 391         char            accounting_dir[128];
 392         ipt             bind_address;
 393         int             send_garp;                      // Set to true to garp for vip address on startup
 394
 395         int             target_uid;
 396         int             dump_speed;
 397         char            plugins[64][MAXPLUGINS];
 398         char            old_plugins[64][MAXPLUGINS];
 399
 400         int             next_tbf;                       // Next HTB id available to use
 401         int             scheduler_fifo;                 // If 1, will force scheduler to use SCHED_FIFO.
 402                                                         // Don't use this unless you have a dual processor machine!
 403         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 404
 405         u32             cluster_address;                // Multicast address of cluster.
 406                                                         // Send to this address to have everyone hear.
 407         char            cluster_interface[64];          // Which interface to listen for multicast on.
 408         int             cluster_iam_master;             // Are we the cluster master???
 409         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 410         u32             cluster_master_address;         // The network address of the cluster master.
 411                                                         // Zero if i am the cluster master.
 412         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 413                                                         // (or the seq number we're next expecting if we're a slave).
 414         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 415         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 416         int             cluster_highest_sessionid;
 417         int             cluster_highest_tunnelid;
 418         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 419         int             cluster_num_changes;            // Number of changes queued.
 420
 421         int             cluster_hb_interval;            // How often to send a heartbeat.
 422         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 423
 424 #ifdef BGP
 425         u16             as_number;
 426         char            bgp_peer[2][64];
 427         u16             bgp_peer_as[2];
 428 #endif
 429 };
 430
 431 struct config_descriptt
 432 {
 433         char *key;
 434         int offset;
 435         int size;
 436         enum { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP } type;
 437 };
 438
 439 // arp.c
 440 void sendarp(int ifr_idx, const unsigned char* mac, ipt ip);
 441
 442
 443 // ppp.c
 444 void processpap(tunnelidt t, sessionidt s, u8 * p, u16 l);
 445 void processchap(tunnelidt t, sessionidt s, u8 * p, u16 l);
 446 void processlcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 447 void processipcp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 448 void processipin(tunnelidt t, sessionidt s, u8 * p, u16 l);
 449 void processccp(tunnelidt t, sessionidt s, u8 * p, u16 l);
 450 void sendchap(tunnelidt t, sessionidt s);
 451 u8 *makeppp(u8 * b, int size, u8 * p, int l, tunnelidt t, sessionidt s, u16 mtype);
 452 u8 *findppp(u8 * b, u8 mtype);
 453 void initlcp(tunnelidt t, sessionidt s);
 454 void dumplcp(u8 *p, int l);
 455
 456
 457 // radius.c
 458 void initrad(void);
 459 void radiussend(u16 r, u8 state);
 460 void processrad(u8 *buf, int len, char socket_index);
 461 void radiusretry(u16 r);
 462 u16 radiusnew(sessionidt s);
 463 void radiusclear(u16 r, sessionidt s);
 464
 465 // throttle.c
 466 int throttle_session(sessionidt s, int throttle);
 467
 468
 469 // rl.c
 470 void init_rl();
 471 u16 rl_create_tbf();
 472 u16 rl_get_tbf();
 473 void rl_done_tbf(u16 t);
 474 void rl_destroy_tbf(u16 t);
 475
 476
 477 // l2tpns.c
 478 clockt now(void);
 479 clockt backoff(u8 try);
 480 void routeset(sessionidt, ipt ip, ipt mask, ipt gw, u8 add);
 481 void inittap(void);
 482 void initudp(void);
 483 void initdata(void);
 484 void initippool();
 485 sessionidt sessionbyip(ipt ip);
 486 sessionidt sessionbyuser(char *username);
 487 void sessionshutdown(sessionidt s, char *reason);
 488 void sessionsendarp(sessionidt s);
 489 void send_garp(ipt ip);
 490 void sessionkill(sessionidt s, char *reason);
 491 void control16(controlt * c, u16 avp, u16 val, u8 m);
 492 void control32(controlt * c, u16 avp, u32 val, u8 m);
 493 void controls(controlt * c, u16 avp, char *val, u8 m);
 494 void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m);
 495 controlt *controlnew(u16 mtype);
 496 void controlnull(tunnelidt t);
 497 void controladd(controlt * c, tunnelidt t, sessionidt s);
 498 void tunnelsend(u8 * buf, u16 l, tunnelidt t);
 499 void tunnelkill(tunnelidt t, char *reason);
 500 void tunnelshutdown(tunnelidt t, char *reason);
 501 void sendipcp(tunnelidt t, sessionidt s);
 502 void processipout(u8 * buf, int len);
 503 void processarp(u8 * buf, int len);
 504 void processudp(u8 * buf, int len, struct sockaddr_in *addr);
 505 void processtap(u8 * buf, int len);
 506 void processcontrol(u8 * buf, int len, struct sockaddr_in *addr);
 507 int assign_ip_address(sessionidt s);
 508 void free_ip_address(sessionidt s);
 509 void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port);
 510 void dump_acct_info();
 511 void mainloop(void);
 512 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 513 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 514 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 515
 516 #define log _log
 517 #ifndef log_hex
 518 #define log_hex(a,b,c,d) do{if (a <= config->debug) _log_hex(a,0,0,0,b,c,d);}while (0)
 519 #endif
 520 void _log(int level, ipt address, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 5, 6)));
 521 void _log_hex(int level, ipt address, sessionidt s, tunnelidt t, const char *title, const char *data, int maxsize);
 522 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
 523 int sessionsetup(tunnelidt t, sessionidt s);
 524 int cluster_send_session(int s);
 525 int cluster_send_tunnel(int t);
 526 int cluster_send_goodbye();
 527 void init_cli(char *hostname);
 528 void cli_do_file(FILE *fh);
 529 void cli_do(int sockfd);
 530 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 531 #ifdef RINGBUFFER
 532 void ringbuffer_dump(FILE *stream);
 533 #endif
 534 void initplugins(void);
 535 int run_plugins(int plugin_type, void *data);
 536 void add_plugin(char *plugin_name);
 537 void remove_plugin(char *plugin_name);
 538 void plugins_done(void);
 539 void tunnelclear(tunnelidt t);
 540 void host_unreachable(ipt destination, u16 id, ipt source, char *packet, int packet_len);
 541 void fix_address_pool(int sid);
 542 void rebuild_address_pool(void);
 543 void send_ipin(sessionidt s, u8 * buf, int len);
 544 int throttle_session(sessionidt s, int throttle);
 545 int load_session(sessionidt, sessiont *);
 546 void become_master(void);       // We're the master; kick off any required master initializations.
 547 extern tunnelt *tunnel;
 548 extern sessiont *session;
 549 extern sessioncountt *sess_count;
 550 extern ippoolt *ip_address_pool;
 551 #define sessionfree (session[0].next)
 552
 553 #define log_backtrace(count, max) \
 554 if (count++ < max) { \
 555         void *array[20]; \
 556         char **strings; \
 557         int size, i; \
 558         log(0, 0, 0, t, "Backtrace follows"); \
 559         size = backtrace(array, 10); \
 560         strings = backtrace_symbols(array, size); \
 561         if (strings) for (i = 0; i < size; i++) \
 562         { \
 563                 log(0, 0, 0, t, "%s\n", strings[i]); \
 564         } \
 565         free(strings); \
 566 }
 567
 568
 569 extern struct configt *config;
 570 extern time_t basetime;         // Time when this process started.
 571 extern time_t time_now;         // Seconds since EPOCH.
 572 extern u32 last_sid;
 573 extern struct Tstats *_statistics;
 574 extern ipt my_address;
 575 extern int tun_write(u8 *data, int size);
 576
 577
 578 #define TIME (config->current_time)
 579
 580 // macros for handling help in cli commands
 581 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 582 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 583
 584 // CVS identifiers (for "show version file")
 585 extern char const *cvs_id_arp;
 586 extern char const *cvs_id_cli;
 587 extern char const *cvs_id_cluster;
 588 extern char const *cvs_id_constants;
 589 extern char const *cvs_id_control;
 590 extern char const *cvs_id_icmp;
 591 extern char const *cvs_id_l2tpns;
 592 extern char const *cvs_id_ll;
 593 extern char const *cvs_id_md5;
 594 extern char const *cvs_id_ppp;
 595 extern char const *cvs_id_radius;
 596 extern char const *cvs_id_tbf;
 597 extern char const *cvs_id_util;
 598
 599 #endif /* __L2TPNS_H__ */