l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.50 2004/12/18 01:20:05 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 "2.1.0"
  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       ((unsigned long)(1L << RADIUS_SHIFT) * 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 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          // IPv4 packet type
  85 #define PKTIPV6         0x86DD          // IPv6 packet type
  86 #define PPPPAP          0xC023
  87 #define PPPCHAP         0xC223
  88 #define PPPLCP          0xC021
  89 #define PPPIPCP         0x8021
  90 #define PPPIPV6CP       0x8057
  91 #define PPPCCP          0x80FD
  92 #define PPPIP           0x0021
  93 #define PPPIPV6         0x0057
  94 #define PPPMP           0x003D
  95 #define MIN_IP_SIZE     0x19
  96 enum
  97 {
  98         ConfigReq = 1,
  99         ConfigAck,
 100         ConfigNak,
 101         ConfigRej,
 102         TerminateReq,
 103         TerminateAck,
 104         CodeRej,
 105         ProtocolRej,
 106         EchoReq,
 107         EchoReply,
 108         DiscardRequest,
 109         IdentRequest
 110 };
 111
 112 // Types
 113 typedef uint16_t sessionidt;
 114 typedef uint16_t tunnelidt;
 115 typedef uint32_t clockt;
 116 typedef uint8_t hasht[16];
 117
 118 // CLI actions
 119 struct cli_session_actions {
 120         char action;
 121         in_addr_t snoop_ip;
 122         uint16_t snoop_port;
 123         int throttle_in;
 124         int throttle_out;
 125         int filter_in;
 126         int filter_out;
 127 };
 128
 129 #define CLI_SESS_KILL           0x01
 130 #define CLI_SESS_SNOOP          0x02
 131 #define CLI_SESS_NOSNOOP        0x04
 132 #define CLI_SESS_THROTTLE       0x08
 133 #define CLI_SESS_NOTHROTTLE     0x10
 134 #define CLI_SESS_FILTER         0x20
 135 #define CLI_SESS_NOFILTER       0x40
 136
 137 struct cli_tunnel_actions {
 138         char action;
 139 };
 140
 141 #define CLI_TUN_KILL            0x01
 142
 143 // dump header: update number if internal format changes
 144 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 145
 146 // structures
 147 typedef struct                  // route
 148 {
 149         in_addr_t ip;
 150         in_addr_t mask;
 151 }
 152 routet;
 153
 154 typedef struct controls         // control message
 155 {
 156         struct controls *next;  // next in queue
 157         uint16_t length;        // length
 158         uint8_t buf[MAXCONTROL];
 159 }
 160 controlt;
 161
 162 typedef struct
 163 {
 164         sessionidt next;                // next session in linked list
 165         sessionidt far;                 // far end session ID
 166         tunnelidt tunnel;               // near end tunnel ID
 167         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 168         int ip_pool_index;              // index to IP pool
 169         unsigned long unique_id;        // unique session id
 170         uint16_t nr;                    // next receive
 171         uint16_t ns;                    // next send
 172         uint32_t magic;                 // ppp magic number
 173         uint32_t cin, cout;             // byte counts
 174         uint32_t pin, pout;             // packet counts
 175         uint32_t total_cin;             // This counter is never reset while a session is open
 176         uint32_t total_cout;            // This counter is never reset while a session is open
 177         uint32_t id;                    // session id
 178         uint16_t throttle_in;           // upstream throttle rate (kbps)
 179         uint16_t throttle_out;          // downstream throttle rate
 180         clockt opened;                  // when started
 181         clockt die;                     // being closed, when to finally free
 182         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 183         in_addr_t dns1, dns2;           // DNS servers
 184         routet route[MAXROUTE];         // static routes
 185         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 186         uint16_t mru;                   // maximum receive unit
 187         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 188         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 189         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 190         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 191         uint8_t walled_garden;          // is this session gardened?
 192         uint8_t flags1;                 // additional flags (currently unused);
 193         char random_vector[MAXTEL];
 194         int random_vector_length;
 195         char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
 196         char called[MAXTEL];            // called number
 197         char calling[MAXTEL];           // calling number
 198         uint32_t tx_connect_speed;
 199         uint32_t rx_connect_speed;
 200         uint32_t flags;                 // Various session flags.
 201         in_addr_t snoop_ip;             // Interception destination IP
 202         uint16_t snoop_port;            // Interception destination port
 203         uint16_t sid;                   // near end session id.
 204         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 205         uint8_t filter_out;             // output filter index
 206         char reserved[18];              // Space to expand structure without changing HB_VERSION
 207 }
 208 sessiont;
 209
 210 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 211 #define SF_LCP_ACKED    2       // LCP negotiated
 212 #define SF_CCP_ACKED    4       // CCP negotiated
 213 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 214 #define SF_IPV6_NACKED  16      // IPv6 rejected
 215
 216 typedef struct
 217 {
 218         uint32_t cin;
 219         uint32_t cout;
 220 } sessioncountt;
 221
 222 #define SESSIONPFC      1       // PFC negotiated flags
 223 #define SESSIONACFC     2       // ACFC negotiated flags
 224
 225 // 168 bytes per tunnel
 226 typedef struct
 227 {
 228         tunnelidt far;          // far end tunnel ID
 229         in_addr_t ip;           // Ip for far end
 230         uint16_t port;          // port for far end
 231         uint16_t window;        // Rx window
 232         uint16_t nr;            // next receive
 233         uint16_t ns;            // next send
 234         int state;              // current state (tunnelstate enum)
 235         clockt last;            // when last control message sent (used for resend timeout)
 236         clockt retry;           // when to try resenting pending control
 237         clockt die;             // being closed, when to finally free
 238         clockt lastrec;         // when the last control message was received
 239         char hostname[128];     // tunnel hostname
 240         char vendor[128];       // LAC vendor
 241         uint8_t try;            // number of retrys on a control message
 242         uint16_t controlc;      // outstaind messages in queue
 243         controlt *controls;     // oldest message
 244         controlt *controle;     // newest message
 245 }
 246 tunnelt;
 247
 248 // 180 bytes per radius session
 249 typedef struct                  // outstanding RADIUS requests
 250 {
 251         sessionidt session;     // which session this applies to
 252         hasht auth;             // request authenticator
 253         clockt retry;           // when to try next
 254         char calling[MAXTEL];   // calling number
 255         char pass[129];         // password
 256         uint8_t id;             // ID for PPP response
 257         uint8_t try;            // which try we are on
 258         uint8_t state;          // state of radius requests
 259         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 260 }
 261 radiust;
 262
 263 typedef struct
 264 {
 265         in_addr_t       address;        // Host byte order..
 266         char            assigned;       // 1 if assigned, 0 if free
 267         sessionidt      session;
 268         clockt          last;           // last used
 269         char            user[129];      // user (try to have ip addresses persistent)
 270 }
 271 ippoolt;
 272
 273 #ifdef RINGBUFFER
 274 struct Tringbuffer
 275 {
 276         struct {
 277                 char level;
 278                 sessionidt session;
 279                 tunnelidt tunnel;
 280                 char message[MAX_LOG_LENGTH];
 281         } buffer[RINGBUFFER_SIZE];
 282         int head;
 283         int tail;
 284 };
 285 #endif
 286
 287 /*
 288  * Possible tunnel states
 289  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 290  */
 291 enum
 292 {
 293         TUNNELFREE,             // Not in use
 294         TUNNELOPEN,             // Active tunnel
 295         TUNNELDIE,              // Currently closing
 296         TUNNELOPENING,          // Busy opening
 297         TUNNELUNDEF,            // Undefined
 298 };
 299
 300 enum
 301 {
 302         RADIUSNULL,             // Not in use
 303         RADIUSCHAP,             // sending CHAP down PPP
 304         RADIUSAUTH,             // sending auth to RADIUS server
 305         RADIUSIPCP,             // sending IPCP to end user
 306         RADIUSSTART,            // sending start accounting to RADIUS server
 307         RADIUSSTOP,             // sending stop accounting to RADIUS server
 308         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 309         RADIUSDEAD,             // errored while talking to radius server.
 310 };
 311
 312 struct Tstats
 313 {
 314     time_t      start_time;
 315     time_t      last_reset;
 316
 317     uint32_t    tun_rx_packets;
 318     uint32_t    tun_tx_packets;
 319     uint32_t    tun_rx_bytes;
 320     uint32_t    tun_tx_bytes;
 321     uint32_t    tun_rx_errors;
 322     uint32_t    tun_tx_errors;
 323
 324     uint32_t    tunnel_rx_packets;
 325     uint32_t    tunnel_tx_packets;
 326     uint32_t    tunnel_rx_bytes;
 327     uint32_t    tunnel_tx_bytes;
 328     uint32_t    tunnel_rx_errors;
 329     uint32_t    tunnel_tx_errors;
 330
 331     uint32_t    tunnel_retries;
 332     uint32_t    radius_retries;
 333
 334     uint32_t    arp_sent;
 335
 336     uint32_t    packets_snooped;
 337
 338     uint32_t    tunnel_created;
 339     uint32_t    session_created;
 340     uint32_t    tunnel_timeout;
 341     uint32_t    session_timeout;
 342     uint32_t    radius_timeout;
 343     uint32_t    radius_overflow;
 344     uint32_t    tunnel_overflow;
 345     uint32_t    session_overflow;
 346
 347     uint32_t    ip_allocated;
 348     uint32_t    ip_freed;
 349
 350     uint32_t    c_forwarded;
 351     uint32_t    recv_forward;
 352
 353     uint32_t    select_called;
 354     uint32_t    multi_read_used;
 355     uint32_t    multi_read_exceeded;
 356
 357 #ifdef STATISTICS
 358     uint32_t    call_processtun;
 359     uint32_t    call_processipout;
 360     uint32_t    call_processudp;
 361     uint32_t    call_sessionbyip;
 362     uint32_t    call_sessionbyuser;
 363     uint32_t    call_sendarp;
 364     uint32_t    call_sendipcp;
 365     uint32_t    call_tunnelsend;
 366     uint32_t    call_sessionkill;
 367     uint32_t    call_sessionshutdown;
 368     uint32_t    call_tunnelkill;
 369     uint32_t    call_tunnelshutdown;
 370     uint32_t    call_assign_ip_address;
 371     uint32_t    call_free_ip_address;
 372     uint32_t    call_dump_acct_info;
 373     uint32_t    call_sessionsetup;
 374     uint32_t    call_processpap;
 375     uint32_t    call_processchap;
 376     uint32_t    call_processlcp;
 377     uint32_t    call_processipcp;
 378     uint32_t    call_processipin;
 379     uint32_t    call_processccp;
 380     uint32_t    call_sendchap;
 381     uint32_t    call_processrad;
 382     uint32_t    call_radiussend;
 383     uint32_t    call_radiusretry;
 384 #endif
 385 };
 386
 387 #ifdef STATISTICS
 388
 389 #ifdef STAT_CALLS
 390 #define CSTAT(x)        STAT(x)
 391 #else
 392 #define CSTAT(x)
 393 #endif
 394
 395 #define STAT(x)         (_statistics->x++)
 396 #define INC_STAT(x,y)   (_statistics->x += (y))
 397 #define GET_STAT(x)     (_statistics->x)
 398 #define SET_STAT(x, y)  (_statistics->x = (y))
 399 #else
 400 #define CSTAT(x)
 401 #define STAT(x)
 402 #define INC_STAT(x,y)
 403 #define GET_STAT(x)     0
 404 #define SET_STAT(x, y)
 405 #endif
 406
 407 typedef struct
 408 {
 409         int             debug;                          // debugging level
 410         time_t          start_time;                     // time when l2tpns was started
 411         char            bandwidth[256];                 // current bandwidth
 412         char            pid_file[256];                  // file to write PID to on startup
 413         int             wrote_pid;
 414         clockt          current_time;                   // 1/10ths of a second since the process started.
 415                                                         // means that we can only run a given process
 416                                                         // for 13 years without re-starting!
 417
 418         char            config_file[128];
 419         int             reload_config;                  // flag to re-read config (set by cli)
 420         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 421         int             multi_read_count;               // amount of packets to read per fd in processing loop
 422
 423         char            tundevice[10];                  // tun device name
 424         char            log_filename[128];
 425         char            l2tpsecret[64];
 426
 427         char            radiussecret[64];
 428         int             radius_accounting;
 429         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 430         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 431         uint8_t         numradiusservers;               // radius server count
 432         short           num_radfds;                     // Number of radius filehandles allocated
 433
 434         in_addr_t       default_dns1, default_dns2;
 435
 436         unsigned long   rl_rate;                        // default throttle rate
 437         int             num_tbfs;                       // number of throttle buckets
 438
 439         int             save_state;
 440         char            accounting_dir[128];
 441         in_addr_t       bind_address;
 442         in_addr_t       peer_address;
 443         int             send_garp;                      // Set to true to garp for vip address on startup
 444
 445         int             target_uid;
 446         int             dump_speed;
 447         char            plugins[64][MAXPLUGINS];
 448         char            old_plugins[64][MAXPLUGINS];
 449
 450         int             next_tbf;                       // Next HTB id available to use
 451         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 452         int             lock_pages;                     // Lock pages into memory.
 453         int             icmp_rate;                      // Max number of ICMP unreachable per second to send>
 454
 455         in_addr_t       cluster_address;                // Multicast address of cluster.
 456                                                         // Send to this address to have everyone hear.
 457         char            cluster_interface[64];          // Which interface to listen for multicast on.
 458         int             cluster_iam_master;             // Are we the cluster master???
 459         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 460         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 461                                                         // Zero if i am the cluster master.
 462         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 463                                                         // (or the seq number we're next expecting if we're a slave).
 464         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 465         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 466         int             cluster_highest_sessionid;
 467         int             cluster_highest_tunnelid;
 468         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 469         int             cluster_num_changes;            // Number of changes queued.
 470
 471         int             cluster_hb_interval;            // How often to send a heartbeat.
 472         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 473         uint64_t        cluster_table_version;          // # state changes processed by cluster
 474
 475 #ifdef BGP
 476 #define BGP_NUM_PEERS   2
 477         uint16_t as_number;
 478         struct {
 479                 char name[64];
 480                 uint16_t as;
 481                 int keepalive;
 482                 int hold;
 483         } neighbour[BGP_NUM_PEERS];
 484 #endif
 485 } configt;
 486
 487 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 488 typedef struct
 489 {
 490         char *key;
 491         int offset;
 492         int size;
 493         enum config_typet type;
 494 } config_descriptt;
 495
 496 typedef struct
 497 {
 498         uint8_t op;     // operation
 499 #define FILTER_PORT_OP_NONE     0 // all ports match
 500 #define FILTER_PORT_OP_EQ       1
 501 #define FILTER_PORT_OP_NEQ      2
 502 #define FILTER_PORT_OP_GT       3
 503 #define FILTER_PORT_OP_LT       4
 504 #define FILTER_PORT_OP_RANGE    5
 505         uint16_t port;  // port (host byte order)
 506         uint16_t port2; // range
 507 } ip_filter_portt;
 508
 509 typedef struct
 510 {
 511         int action;             // permit/deny
 512 #define FILTER_ACTION_DENY      1
 513 #define FILTER_ACTION_PERMIT    2
 514         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 515         in_addr_t src_ip;       // source ip (network byte order)
 516         in_addr_t src_wild;
 517         ip_filter_portt src_ports;
 518         in_addr_t dst_ip;       // dest ip
 519         in_addr_t dst_wild;
 520         ip_filter_portt dst_ports;
 521         uint8_t frag;           // apply to non-initial fragments
 522         uint8_t tcp_flag_op;    // match type: any, all, established
 523 #define FILTER_FLAG_OP_ANY      1
 524 #define FILTER_FLAG_OP_ALL      2
 525 #define FILTER_FLAG_OP_EST      3
 526         uint8_t tcp_sflags;     // flags set
 527         uint8_t tcp_cflags;     // flags clear
 528         uint32_t counter;       // match count
 529 } ip_filter_rulet;
 530
 531 #define TCP_FLAG_FIN    0x01
 532 #define TCP_FLAG_SYN    0x02
 533 #define TCP_FLAG_RST    0x04
 534 #define TCP_FLAG_PSH    0x08
 535 #define TCP_FLAG_ACK    0x10
 536 #define TCP_FLAG_URG    0x20
 537
 538 #define MAXFILTER               32
 539 #define MAXFILTER_RULES         32
 540 typedef struct
 541 {
 542         char name[32];          // ACL name
 543         int extended;           // type: 0 = standard, 1 = extended
 544         ip_filter_rulet rules[MAXFILTER_RULES];
 545         int used;               // session ref count
 546 } ip_filtert;
 547
 548 // arp.c
 549 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 550
 551
 552 // ppp.c
 553 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 554 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 555 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 556 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 557 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 558 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 559 void sendchap(tunnelidt t, sessionidt s);
 560 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 561 void initlcp(tunnelidt t, sessionidt s);
 562 void send_ipin(sessionidt s, uint8_t *buf, int len);
 563
 564
 565 // radius.c
 566 void initrad(void);
 567 void radiussend(uint16_t r, uint8_t state);
 568 void processrad(uint8_t *buf, int len, char socket_index);
 569 void radiusretry(uint16_t r);
 570 uint16_t radiusnew(sessionidt s);
 571 void radiusclear(uint16_t r, sessionidt s);
 572
 573
 574 // l2tpns.c
 575 clockt backoff(uint8_t try);
 576 sessionidt sessionbyip(in_addr_t ip);
 577 sessionidt sessionbyuser(char *username);
 578 void sessionshutdown(sessionidt s, char *reason);
 579 void send_garp(in_addr_t ip);
 580 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 581 void sendipcp(tunnelidt t, sessionidt s);
 582 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 583 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 584 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 585 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 586 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 587 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 588
 589 #undef LOG
 590 #undef LOG_HEX
 591 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 592 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 593
 594 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 595 void _log_hex(int level, const char *title, const char *data, int maxsize);
 596
 597 int sessionsetup(tunnelidt t, sessionidt s);
 598 int run_plugins(int plugin_type, void *data);
 599 void rebuild_address_pool(void);
 600 void throttle_session(sessionidt s, int rate_in, int rate_out);
 601 int load_session(sessionidt, sessiont *);
 602 void become_master(void);       // We're the master; kick off any required master initializations.
 603
 604
 605 // cli.c
 606 void init_cli(char *hostname);
 607 void cli_do_file(FILE *fh);
 608 void cli_do(int sockfd);
 609 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 610
 611
 612 // icmp.c
 613 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 614
 615
 616 extern tunnelt *tunnel;
 617 extern sessiont *session;
 618 extern sessioncountt *sess_count;
 619 extern ippoolt *ip_address_pool;
 620 #define sessionfree (session[0].next)
 621
 622 #define log_backtrace(count, max) \
 623 if (count++ < max) { \
 624         void *array[20]; \
 625         char **strings; \
 626         int size, i; \
 627         LOG(0, 0, t, "Backtrace follows"); \
 628         size = backtrace(array, 10); \
 629         strings = backtrace_symbols(array, size); \
 630         if (strings) for (i = 0; i < size; i++) \
 631         { \
 632                 LOG(0, 0, t, "%s\n", strings[i]); \
 633         } \
 634         free(strings); \
 635 }
 636
 637
 638 extern configt *config;
 639 extern time_t basetime;         // Time when this process started.
 640 extern time_t time_now;         // Seconds since EPOCH.
 641 extern uint32_t last_id;
 642 extern struct Tstats *_statistics;
 643 extern in_addr_t my_address;
 644 extern int tun_write(uint8_t *data, int size);
 645 extern int clifd;
 646
 647
 648 #define TIME (config->current_time)
 649
 650 // macros for handling help in cli commands
 651 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 652 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 653
 654 // CVS identifiers (for "show version file")
 655 extern char const *cvs_id_arp;
 656 extern char const *cvs_id_cli;
 657 extern char const *cvs_id_cluster;
 658 extern char const *cvs_id_constants;
 659 extern char const *cvs_id_control;
 660 extern char const *cvs_id_icmp;
 661 extern char const *cvs_id_l2tpns;
 662 extern char const *cvs_id_ll;
 663 extern char const *cvs_id_md5;
 664 extern char const *cvs_id_ppp;
 665 extern char const *cvs_id_radius;
 666 extern char const *cvs_id_tbf;
 667 extern char const *cvs_id_util;
 668
 669 #endif /* __L2TPNS_H__ */