l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.49.2.9 2005/05/16 05:01:51 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 "2.0.20"
  19
  20 // Limits
  21 #define MAXTUNNEL       500             // could be up to 65535
  22 #define MAXSESSION      60000           // could be up to 65535
  23 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  24
  25 #define RADIUS_SHIFT    6
  26 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  27 #define MAXRADIUS       ((1 << (RADIUS_SHIFT + 8)) - 1)
  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 tun
  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 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  44
  45 // Constants
  46 #ifndef ETCDIR
  47 #define ETCDIR          "/etc/l2tpns"
  48 #endif
  49
  50 #ifndef LIBDIR
  51 #define LIBDIR          "/usr/lib/l2tpns"
  52 #endif
  53
  54 #ifndef STATEDIR
  55 #define STATEDIR        "/var/lib/l2tpns"
  56 #endif
  57
  58 #ifndef PLUGINDIR
  59 #define PLUGINDIR       LIBDIR          // Plugins
  60 #endif
  61
  62 #ifndef PLUGINCONF
  63 #define PLUGINCONF      ETCDIR          // Plugin config dir
  64 #endif
  65
  66 #ifndef FLASHDIR
  67 #define FLASHDIR        ETCDIR
  68 #endif
  69
  70 #ifndef DATADIR
  71 #define DATADIR         STATEDIR
  72 #endif
  73
  74 #define TUNDEVICE       "/dev/net/tun"
  75 #define STATEFILE       DATADIR "/state.dump"           // State dump file
  76 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  77 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  78 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  79 #define ACCT_TIME       3000            // 5 minute accounting interval
  80 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  81 #define L2TPPORT        1701            // L2TP port
  82 #define RADPORT         1645            // old radius port...
  83 #define PKTARP          0x0806          // ARP packet type
  84 #define PKTIP           0x0800          // IP packet type
  85 #define PSEUDOMAC       0x0200          // pseudo MAC prefix (local significant MAC)
  86 #define PPPPAP          0xC023
  87 #define PPPCHAP         0xC223
  88 #define PPPLCP          0xC021
  89 #define PPPIPCP         0x8021
  90 #define PPPCCP          0x80FD
  91 #define PPPIP           0x0021
  92 #define PPPMP           0x003D
  93 #define MIN_IP_SIZE     0x19
  94 enum
  95 {
  96         ConfigReq = 1,
  97         ConfigAck,
  98         ConfigNak,
  99         ConfigRej,
 100         TerminateReq,
 101         TerminateAck,
 102         CodeRej,
 103         ProtocolRej,
 104         EchoReq,
 105         EchoReply,
 106         DiscardRequest,
 107         IdentRequest
 108 };
 109
 110 // Types
 111 typedef uint16_t sessionidt;
 112 typedef uint16_t tunnelidt;
 113 typedef uint32_t clockt;
 114 typedef uint8_t hasht[16];
 115
 116 // CLI actions
 117 struct cli_session_actions {
 118         char action;
 119         in_addr_t snoop_ip;
 120         uint16_t snoop_port;
 121         int throttle_in;
 122         int throttle_out;
 123         int filter_in;
 124         int filter_out;
 125 };
 126
 127 #define CLI_SESS_KILL           0x01
 128 #define CLI_SESS_SNOOP          0x02
 129 #define CLI_SESS_NOSNOOP        0x04
 130 #define CLI_SESS_THROTTLE       0x08
 131 #define CLI_SESS_NOTHROTTLE     0x10
 132 #define CLI_SESS_FILTER         0x20
 133 #define CLI_SESS_NOFILTER       0x40
 134
 135 struct cli_tunnel_actions {
 136         char action;
 137 };
 138
 139 #define CLI_TUN_KILL            0x01
 140
 141 // dump header: update number if internal format changes
 142 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 143
 144 // structures
 145 typedef struct                  // route
 146 {
 147         in_addr_t ip;
 148         in_addr_t mask;
 149 }
 150 routet;
 151
 152 typedef struct controls         // control message
 153 {
 154         struct controls *next;  // next in queue
 155         uint16_t length;        // length
 156         uint8_t buf[MAXCONTROL];
 157 }
 158 controlt;
 159
 160 typedef struct
 161 {
 162         sessionidt next;                // next session in linked list
 163         sessionidt far;                 // far end session ID
 164         tunnelidt tunnel;               // near end tunnel ID
 165         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 166         int ip_pool_index;              // index to IP pool
 167         unsigned long unique_id;        // unique session id
 168         uint16_t nr;                    // next receive
 169         uint16_t ns;                    // next send
 170         uint32_t magic;                 // ppp magic number
 171         uint32_t cin, cout;             // byte counts
 172         uint32_t pin, pout;             // packet counts
 173         uint32_t total_cin;             // This counter is never reset while a session is open
 174         uint32_t total_cout;            // This counter is never reset while a session is open
 175         uint32_t id;                    // session id
 176         uint16_t throttle_in;           // upstream throttle rate (kbps)
 177         uint16_t throttle_out;          // downstream throttle rate
 178         clockt opened;                  // when started
 179         clockt die;                     // being closed, when to finally free
 180         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 181         in_addr_t dns1, dns2;           // DNS servers
 182         routet route[MAXROUTE];         // static routes
 183         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 184         uint16_t mru;                   // maximum receive unit
 185         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 186         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 187         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 188         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 189         uint8_t walled_garden;          // is this session gardened?
 190         uint8_t flags1;                 // additional flags (currently unused);
 191         char random_vector[MAXTEL];
 192         int random_vector_length;
 193         char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
 194         char called[MAXTEL];            // called number
 195         char calling[MAXTEL];           // calling number
 196         uint32_t tx_connect_speed;
 197         uint32_t rx_connect_speed;
 198         uint32_t flags;                 // Various session flags.
 199         in_addr_t snoop_ip;             // Interception destination IP
 200         uint16_t snoop_port;            // Interception destination port
 201         uint16_t sid;                   // near end session id.
 202         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 203         uint8_t filter_out;             // output filter index
 204         char reserved[18];              // Space to expand structure without changing HB_VERSION
 205 }
 206 sessiont;
 207
 208 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 209 #define SF_LCP_ACKED    2       // LCP negotiated
 210 #define SF_CCP_ACKED    4       // CCP negotiated
 211
 212 typedef struct
 213 {
 214         // byte counters
 215         uint32_t cin;
 216         uint32_t cout;
 217
 218         // DoS prevention
 219         clockt last_packet_out;
 220         uint32_t packets_out;
 221         uint32_t packets_dropped;
 222 } sessionlocalt;
 223
 224 #define SESSIONPFC      1       // PFC negotiated flags
 225 #define SESSIONACFC     2       // ACFC negotiated flags
 226
 227 // 168 bytes per tunnel
 228 typedef struct
 229 {
 230         tunnelidt far;          // far end tunnel ID
 231         in_addr_t ip;           // Ip for far end
 232         uint16_t port;          // port for far end
 233         uint16_t window;        // Rx window
 234         uint16_t nr;            // next receive
 235         uint16_t ns;            // next send
 236         int state;              // current state (tunnelstate enum)
 237         clockt last;            // when last control message sent (used for resend timeout)
 238         clockt retry;           // when to try resenting pending control
 239         clockt die;             // being closed, when to finally free
 240         clockt lastrec;         // when the last control message was received
 241         char hostname[128];     // tunnel hostname
 242         char vendor[128];       // LAC vendor
 243         uint8_t try;            // number of retrys on a control message
 244         uint16_t controlc;      // outstaind messages in queue
 245         controlt *controls;     // oldest message
 246         controlt *controle;     // newest message
 247 }
 248 tunnelt;
 249
 250 // 180 bytes per radius session
 251 typedef struct                  // outstanding RADIUS requests
 252 {
 253         sessionidt session;     // which session this applies to
 254         hasht auth;             // request authenticator
 255         clockt retry;           // when to try next
 256         char calling[MAXTEL];   // calling number
 257         char pass[129];         // password
 258         uint8_t id;             // ID for PPP response
 259         uint8_t try;            // which try we are on
 260         uint8_t state;          // state of radius requests
 261         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 262 }
 263 radiust;
 264
 265 typedef struct
 266 {
 267         in_addr_t       address;        // Host byte order..
 268         char            assigned;       // 1 if assigned, 0 if free
 269         sessionidt      session;
 270         clockt          last;           // last used
 271         char            user[129];      // user (try to have ip addresses persistent)
 272 }
 273 ippoolt;
 274
 275 #ifdef RINGBUFFER
 276 struct Tringbuffer
 277 {
 278         struct {
 279                 char level;
 280                 sessionidt session;
 281                 tunnelidt tunnel;
 282                 char message[MAX_LOG_LENGTH];
 283         } buffer[RINGBUFFER_SIZE];
 284         int head;
 285         int tail;
 286 };
 287 #endif
 288
 289 /*
 290  * Possible tunnel states
 291  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 292  */
 293 enum
 294 {
 295         TUNNELFREE,             // Not in use
 296         TUNNELOPEN,             // Active tunnel
 297         TUNNELDIE,              // Currently closing
 298         TUNNELOPENING,          // Busy opening
 299         TUNNELUNDEF,            // Undefined
 300 };
 301
 302 enum
 303 {
 304         RADIUSNULL,             // Not in use
 305         RADIUSCHAP,             // sending CHAP down PPP
 306         RADIUSAUTH,             // sending auth to RADIUS server
 307         RADIUSIPCP,             // sending IPCP to end user
 308         RADIUSSTART,            // sending start accounting to RADIUS server
 309         RADIUSSTOP,             // sending stop accounting to RADIUS server
 310         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 311         RADIUSDEAD,             // errored while talking to radius server.
 312 };
 313
 314 struct Tstats
 315 {
 316     time_t      start_time;
 317     time_t      last_reset;
 318
 319     uint32_t    tun_rx_packets;
 320     uint32_t    tun_tx_packets;
 321     uint32_t    tun_rx_bytes;
 322     uint32_t    tun_tx_bytes;
 323     uint32_t    tun_rx_errors;
 324     uint32_t    tun_tx_errors;
 325     uint32_t    tun_rx_dropped;
 326
 327     uint32_t    tunnel_rx_packets;
 328     uint32_t    tunnel_tx_packets;
 329     uint32_t    tunnel_rx_bytes;
 330     uint32_t    tunnel_tx_bytes;
 331     uint32_t    tunnel_rx_errors;
 332     uint32_t    tunnel_tx_errors;
 333
 334     uint32_t    tunnel_retries;
 335     uint32_t    radius_retries;
 336
 337     uint32_t    arp_sent;
 338
 339     uint32_t    packets_snooped;
 340
 341     uint32_t    tunnel_created;
 342     uint32_t    session_created;
 343     uint32_t    tunnel_timeout;
 344     uint32_t    session_timeout;
 345     uint32_t    radius_timeout;
 346     uint32_t    radius_overflow;
 347     uint32_t    tunnel_overflow;
 348     uint32_t    session_overflow;
 349
 350     uint32_t    ip_allocated;
 351     uint32_t    ip_freed;
 352
 353     uint32_t    c_forwarded;
 354     uint32_t    recv_forward;
 355
 356     uint32_t    select_called;
 357     uint32_t    multi_read_used;
 358     uint32_t    multi_read_exceeded;
 359
 360 #ifdef STATISTICS
 361     uint32_t    call_processtun;
 362     uint32_t    call_processipout;
 363     uint32_t    call_processudp;
 364     uint32_t    call_sessionbyip;
 365     uint32_t    call_sessionbyuser;
 366     uint32_t    call_sendarp;
 367     uint32_t    call_sendipcp;
 368     uint32_t    call_tunnelsend;
 369     uint32_t    call_sessionkill;
 370     uint32_t    call_sessionshutdown;
 371     uint32_t    call_tunnelkill;
 372     uint32_t    call_tunnelshutdown;
 373     uint32_t    call_assign_ip_address;
 374     uint32_t    call_free_ip_address;
 375     uint32_t    call_dump_acct_info;
 376     uint32_t    call_sessionsetup;
 377     uint32_t    call_processpap;
 378     uint32_t    call_processchap;
 379     uint32_t    call_processlcp;
 380     uint32_t    call_processipcp;
 381     uint32_t    call_processipin;
 382     uint32_t    call_processccp;
 383     uint32_t    call_sendchap;
 384     uint32_t    call_processrad;
 385     uint32_t    call_radiussend;
 386     uint32_t    call_radiusretry;
 387 #endif
 388 };
 389
 390 #ifdef STATISTICS
 391
 392 #ifdef STAT_CALLS
 393 #define CSTAT(x)        STAT(x)
 394 #else
 395 #define CSTAT(x)
 396 #endif
 397
 398 #define STAT(x)         (_statistics->x++)
 399 #define INC_STAT(x,y)   (_statistics->x += (y))
 400 #define GET_STAT(x)     (_statistics->x)
 401 #define SET_STAT(x, y)  (_statistics->x = (y))
 402 #else
 403 #define CSTAT(x)
 404 #define STAT(x)
 405 #define INC_STAT(x,y)
 406 #define GET_STAT(x)     0
 407 #define SET_STAT(x, y)
 408 #endif
 409
 410 typedef struct
 411 {
 412         int             debug;                          // debugging level
 413         time_t          start_time;                     // time when l2tpns was started
 414         char            bandwidth[256];                 // current bandwidth
 415         char            pid_file[256];                  // file to write PID to on startup
 416         int             wrote_pid;
 417         clockt          current_time;                   // 1/10ths of a second since the process started.
 418                                                         // means that we can only run a given process
 419                                                         // for 13 years without re-starting!
 420
 421         char            config_file[128];
 422         int             reload_config;                  // flag to re-read config (set by cli)
 423         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 424         int             multi_read_count;               // amount of packets to read per fd in processing loop
 425
 426         char            tundevice[10];                  // tun device name
 427         char            log_filename[128];
 428         char            l2tpsecret[64];
 429
 430         char            radiussecret[64];
 431         int             radius_accounting;
 432         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 433         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 434         uint8_t         numradiusservers;               // radius server count
 435         short           num_radfds;                     // Number of radius filehandles allocated
 436
 437         in_addr_t       default_dns1, default_dns2;
 438
 439         unsigned long   rl_rate;                        // default throttle rate
 440         int             num_tbfs;                       // number of throttle buckets
 441
 442         int             save_state;
 443         char            accounting_dir[128];
 444         in_addr_t       bind_address;
 445         in_addr_t       peer_address;
 446         int             send_garp;                      // Set to true to garp for vip address on startup
 447
 448         int             target_uid;
 449         int             dump_speed;
 450         char            plugins[64][MAXPLUGINS];
 451         char            old_plugins[64][MAXPLUGINS];
 452
 453         int             next_tbf;                       // Next HTB id available to use
 454         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 455         int             lock_pages;                     // Lock pages into memory.
 456         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 457         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 458
 459         in_addr_t       cluster_address;                // Multicast address of cluster.
 460                                                         // Send to this address to have everyone hear.
 461         char            cluster_interface[64];          // Which interface to listen for multicast on.
 462         int             cluster_iam_master;             // Are we the cluster master???
 463         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 464         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 465                                                         // Zero if i am the cluster master.
 466         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 467                                                         // (or the seq number we're next expecting if we're a slave).
 468         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 469         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 470         int             cluster_highest_sessionid;
 471         int             cluster_highest_tunnelid;
 472         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 473         int             cluster_num_changes;            // Number of changes queued.
 474
 475         int             cluster_hb_interval;            // How often to send a heartbeat.
 476         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 477         uint64_t        cluster_table_version;          // # state changes processed by cluster
 478
 479 #ifdef BGP
 480 #define BGP_NUM_PEERS   2
 481         uint16_t as_number;
 482         struct {
 483                 char name[64];
 484                 uint16_t as;
 485                 int keepalive;
 486                 int hold;
 487         } neighbour[BGP_NUM_PEERS];
 488 #endif
 489 } configt;
 490
 491 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IP, MAC };
 492 typedef struct
 493 {
 494         char *key;
 495         int offset;
 496         int size;
 497         enum config_typet type;
 498 } config_descriptt;
 499
 500 typedef struct
 501 {
 502         uint8_t op;     // operation
 503 #define FILTER_PORT_OP_NONE     0 // all ports match
 504 #define FILTER_PORT_OP_EQ       1
 505 #define FILTER_PORT_OP_NEQ      2
 506 #define FILTER_PORT_OP_GT       3
 507 #define FILTER_PORT_OP_LT       4
 508 #define FILTER_PORT_OP_RANGE    5
 509         uint16_t port;  // port (host byte order)
 510         uint16_t port2; // range
 511 } ip_filter_portt;
 512
 513 typedef struct
 514 {
 515         int action;             // permit/deny
 516 #define FILTER_ACTION_DENY      1
 517 #define FILTER_ACTION_PERMIT    2
 518         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 519         in_addr_t src_ip;       // source ip (network byte order)
 520         in_addr_t src_wild;
 521         ip_filter_portt src_ports;
 522         in_addr_t dst_ip;       // dest ip
 523         in_addr_t dst_wild;
 524         ip_filter_portt dst_ports;
 525         uint8_t frag;           // apply to non-initial fragments
 526         uint8_t tcp_flag_op;    // match type: any, all, established
 527 #define FILTER_FLAG_OP_ANY      1
 528 #define FILTER_FLAG_OP_ALL      2
 529 #define FILTER_FLAG_OP_EST      3
 530         uint8_t tcp_sflags;     // flags set
 531         uint8_t tcp_cflags;     // flags clear
 532         uint32_t counter;       // match count
 533 } ip_filter_rulet;
 534
 535 #define TCP_FLAG_FIN    0x01
 536 #define TCP_FLAG_SYN    0x02
 537 #define TCP_FLAG_RST    0x04
 538 #define TCP_FLAG_PSH    0x08
 539 #define TCP_FLAG_ACK    0x10
 540 #define TCP_FLAG_URG    0x20
 541
 542 #define MAXFILTER               32
 543 #define MAXFILTER_RULES         32
 544 typedef struct
 545 {
 546         char name[32];          // ACL name
 547         int extended;           // type: 0 = standard, 1 = extended
 548         ip_filter_rulet rules[MAXFILTER_RULES];
 549         int used;               // session ref count
 550 } ip_filtert;
 551
 552 // arp.c
 553 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 554
 555
 556 // ppp.c
 557 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 558 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 559 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 560 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 561 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 562 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 563 void sendchap(tunnelidt t, sessionidt s);
 564 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 565 void initlcp(tunnelidt t, sessionidt s);
 566 void send_ipin(sessionidt s, uint8_t *buf, int len);
 567
 568
 569 // radius.c
 570 void initrad(void);
 571 void radiussend(uint16_t r, uint8_t state);
 572 void processrad(uint8_t *buf, int len, char socket_index);
 573 void radiusretry(uint16_t r);
 574 uint16_t radiusnew(sessionidt s);
 575 void radiusclear(uint16_t r, sessionidt s);
 576
 577
 578 // l2tpns.c
 579 clockt backoff(uint8_t try);
 580 sessionidt sessionbyip(in_addr_t ip);
 581 sessionidt sessionbyuser(char *username);
 582 void sessionkill(sessionidt s, char *reason);
 583 void sessionshutdown(sessionidt s, char *reason);
 584 void send_garp(in_addr_t ip);
 585 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 586 void sendipcp(tunnelidt t, sessionidt s);
 587 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 588 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 589 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 590 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 591 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 592 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 593
 594 #undef LOG
 595 #undef LOG_HEX
 596 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 597 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 598
 599 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 600 void _log_hex(int level, const char *title, const char *data, int maxsize);
 601
 602 int sessionsetup(tunnelidt t, sessionidt s);
 603 int run_plugins(int plugin_type, void *data);
 604 void rebuild_address_pool(void);
 605 void throttle_session(sessionidt s, int rate_in, int rate_out);
 606 int load_session(sessionidt, sessiont *);
 607 void become_master(void);       // We're the master; kick off any required master initializations.
 608
 609
 610 // cli.c
 611 void init_cli(char *hostname);
 612 void cli_do_file(FILE *fh);
 613 void cli_do(int sockfd);
 614 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 615
 616
 617 // icmp.c
 618 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 619
 620
 621 extern tunnelt *tunnel;
 622 extern sessiont *session;
 623 extern sessionlocalt *sess_local;
 624 extern ippoolt *ip_address_pool;
 625 #define sessionfree (session[0].next)
 626
 627 #define log_backtrace(count, max) \
 628 if (count++ < max) { \
 629         void *array[20]; \
 630         char **strings; \
 631         int size, i; \
 632         LOG(0, 0, t, "Backtrace follows"); \
 633         size = backtrace(array, 10); \
 634         strings = backtrace_symbols(array, size); \
 635         if (strings) for (i = 0; i < size; i++) \
 636         { \
 637                 LOG(0, 0, t, "%s\n", strings[i]); \
 638         } \
 639         free(strings); \
 640 }
 641
 642
 643 extern configt *config;
 644 extern time_t basetime;         // Time when this process started.
 645 extern time_t time_now;         // Seconds since EPOCH.
 646 extern uint32_t last_id;
 647 extern struct Tstats *_statistics;
 648 extern in_addr_t my_address;
 649 extern int tun_write(uint8_t *data, int size);
 650 extern int clifd;
 651
 652
 653 #define TIME (config->current_time)
 654
 655 // macros for handling help in cli commands
 656 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 657 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 658
 659 // CVS identifiers (for "show version file")
 660 extern char const *cvs_id_arp;
 661 extern char const *cvs_id_cli;
 662 extern char const *cvs_id_cluster;
 663 extern char const *cvs_id_constants;
 664 extern char const *cvs_id_control;
 665 extern char const *cvs_id_icmp;
 666 extern char const *cvs_id_l2tpns;
 667 extern char const *cvs_id_ll;
 668 extern char const *cvs_id_md5;
 669 extern char const *cvs_id_ppp;
 670 extern char const *cvs_id_radius;
 671 extern char const *cvs_id_tbf;
 672 extern char const *cvs_id_util;
 673
 674 #endif /* __L2TPNS_H__ */