l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.90 2005-09-15 09:34:49 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 "2.1.7"
  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_FDS      (1 << RADIUS_SHIFT)
  27 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  28 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  29
  30 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  31 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  32
  33 #define MAXCONTROL      1000            // max length control message we ever send...
  34 #define MAXMRU          1500            // max MRU as defined by RFC1661
  35 #define MAXETHER        (MAXMRU+18)     // max packet we try sending to tun
  36 #define MAXTEL          96              // telephone number
  37 #define MAXUSER         128             // username
  38 #define MAXPASS         128             // password
  39 #define MAXPLUGINS      20              // maximum number of plugins to load
  40 #define MAXRADSERVER    10              // max radius servers
  41 #define MAXROUTE        10              // max static routes per session
  42 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  43 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  44 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  45 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  46 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  47 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  48 #define DEFAULT_MRU     1452            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
  49
  50 // Constants
  51 #ifndef ETCDIR
  52 #define ETCDIR          "/etc/l2tpns"
  53 #endif
  54
  55 #ifndef LIBDIR
  56 #define LIBDIR          "/usr/lib/l2tpns"
  57 #endif
  58
  59 #ifndef PLUGINDIR
  60 #define PLUGINDIR       LIBDIR          // Plugins
  61 #endif
  62
  63 #ifndef PLUGINCONF
  64 #define PLUGINCONF      ETCDIR          // Plugin config dir
  65 #endif
  66
  67 #ifndef FLASHDIR
  68 #define FLASHDIR        ETCDIR
  69 #endif
  70
  71 #define TUNDEVICE       "/dev/net/tun"
  72 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  73 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  74 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  75 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  76 #define ACCT_TIME       3000                            // 5 minute accounting interval
  77 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  78 #define L2TPPORT        1701                            // L2TP port
  79 #define RADPORT         1645                            // old radius port...
  80 #define DAEPORT         3799                            // DAE port
  81 #define PKTARP          0x0806                          // ARP packet type
  82 #define PKTIP           0x0800                          // IPv4 packet type
  83 #define PKTIPV6         0x86DD                          // IPv6 packet type
  84 #define PPPPAP          0xC023
  85 #define PPPCHAP         0xC223
  86 #define PPPLCP          0xC021
  87 #define PPPIPCP         0x8021
  88 #define PPPIPV6CP       0x8057
  89 #define PPPCCP          0x80FD
  90 #define PPPIP           0x0021
  91 #define PPPIPV6         0x0057
  92 #define PPPMP           0x003D
  93 #define MIN_IP_SIZE     0x19
  94
  95 enum {
  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 enum {
 111         AccessRequest = 1,
 112         AccessAccept,
 113         AccessReject,
 114         AccountingRequest,
 115         AccountingResponse,
 116         AccessChallenge = 11,
 117         DisconnectRequest = 40,
 118         DisconnectACK,
 119         DisconnectNAK,
 120         CoARequest,
 121         CoAACK,
 122         CoANAK
 123 };
 124
 125 // PPP phases
 126 enum {
 127         Dead,
 128         Establish,
 129         Authenticate,
 130         Network,
 131         Terminate
 132 };
 133
 134 // PPP states
 135 enum {
 136         Initial,
 137         Starting,
 138         Closed,
 139         Stopped,
 140         Closing,
 141         Stopping,
 142         RequestSent,
 143         AckReceived,
 144         AckSent,
 145         Opened
 146 };
 147
 148 // reset state machine counters
 149 #define initialise_restart_count(_s, _fsm)                      \
 150         sess_local[_s]._fsm.conf_sent = sess_local[_s]._fsm.nak_sent
 151
 152 // stop timer on change to state where timer does not run
 153 #define change_state(_s, _fsm, _new) ({                         \
 154         if (_new != session[_s].ppp._fsm)                       \
 155         {                                                       \
 156                 switch (_new)                                   \
 157                 {                                               \
 158                 case Initial:                                   \
 159                 case Starting:                                  \
 160                 case Closed:                                    \
 161                 case Stopped:                                   \
 162                 case Opened:                                    \
 163                         sess_local[_s]._fsm.restart = 0;        \
 164                         initialise_restart_count(_s, _fsm);     \
 165                 }                                               \
 166                 session[_s].ppp._fsm = _new;                    \
 167                 cluster_send_session(_s);                       \
 168         }                                                       \
 169 })
 170
 171 // Types
 172 typedef uint16_t sessionidt;
 173 typedef uint16_t tunnelidt;
 174 typedef uint32_t clockt;
 175 typedef uint8_t hasht[16];
 176
 177 // CLI actions
 178 struct cli_session_actions {
 179         char action;
 180         in_addr_t snoop_ip;
 181         uint16_t snoop_port;
 182         int throttle_in;
 183         int throttle_out;
 184         int filter_in;
 185         int filter_out;
 186 };
 187
 188 #define CLI_SESS_KILL           0x01
 189 #define CLI_SESS_SNOOP          0x02
 190 #define CLI_SESS_NOSNOOP        0x04
 191 #define CLI_SESS_THROTTLE       0x08
 192 #define CLI_SESS_NOTHROTTLE     0x10
 193 #define CLI_SESS_FILTER         0x20
 194 #define CLI_SESS_NOFILTER       0x40
 195
 196 struct cli_tunnel_actions {
 197         char action;
 198 };
 199
 200 #define CLI_TUN_KILL            0x01
 201
 202 // structures
 203 typedef struct                  // route
 204 {
 205         in_addr_t ip;
 206         in_addr_t mask;
 207 }
 208 routet;
 209
 210 typedef struct controls         // control message
 211 {
 212         struct controls *next;  // next in queue
 213         uint16_t length;        // length
 214         uint8_t buf[MAXCONTROL];
 215 }
 216 controlt;
 217
 218 typedef struct
 219 {
 220         sessionidt next;                // next session in linked list
 221         sessionidt far;                 // far end session ID
 222         tunnelidt tunnel;               // near end tunnel ID
 223         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 224         struct {
 225                 uint8_t phase;          // PPP phase
 226                 uint8_t lcp:4;          //   LCP    state
 227                 uint8_t ipcp:4;         //   IPCP   state
 228                 uint8_t ipv6cp:4;       //   IPV6CP state
 229                 uint8_t ccp:4;          //   CCP    state
 230                 uint8_t pad;            // unused
 231         } ppp;
 232         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 233         int ip_pool_index;              // index to IP pool
 234         uint32_t unique_id;             // unique session id
 235         uint16_t nr;                    // next receive
 236         uint16_t ns;                    // next send
 237         uint32_t magic;                 // ppp magic number
 238         uint32_t pin, pout;             // packet counts
 239         uint32_t cin, cout;             // byte counts
 240         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 241         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 242         uint16_t throttle_in;           // upstream throttle rate (kbps)
 243         uint16_t throttle_out;          // downstream throttle rate
 244         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 245         uint8_t filter_out;             // output filter index
 246         uint16_t mru;                   // maximum receive unit
 247         clockt opened;                  // when started
 248         clockt die;                     // being closed, when to finally free
 249         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 250         in_addr_t dns1, dns2;           // DNS servers
 251         routet route[MAXROUTE];         // static routes
 252         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 253         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 254         int random_vector_length;
 255         uint8_t random_vector[MAXTEL];
 256         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 257         char called[MAXTEL];            // called number
 258         char calling[MAXTEL];           // calling number
 259         uint32_t tx_connect_speed;
 260         uint32_t rx_connect_speed;
 261         in_addr_t snoop_ip;             // Interception destination IP
 262         uint16_t snoop_port;            // Interception destination port
 263         uint8_t walled_garden;          // is this session gardened?
 264         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 265         struct in6_addr ipv6route;      // Static IPv6 route
 266         char reserved[11];              // Space to expand structure without changing HB_VERSION
 267 }
 268 sessiont;
 269
 270 #define AUTHPAP         1       // allow PAP
 271 #define AUTHCHAP        2       // allow CHAP
 272
 273 typedef struct
 274 {
 275         // packet counters
 276         uint32_t pin;
 277         uint32_t pout;
 278
 279         // byte counters
 280         uint32_t cin;
 281         uint32_t cout;
 282
 283         // PPP restart timer/counters
 284         struct {
 285                 time_t restart;
 286                 int conf_sent;
 287                 int nak_sent;
 288         } lcp, ipcp, ipv6cp, ccp;
 289
 290         // identifier for Protocol-Reject, Code-Reject
 291         uint8_t lcp_ident;
 292
 293         // authentication to use
 294         int lcp_authtype;
 295
 296         // DoS prevention
 297         clockt last_packet_out;
 298         uint32_t packets_out;
 299         uint32_t packets_dropped;
 300
 301         // RADIUS session in use
 302         uint16_t radius;
 303
 304         // interim RADIUS
 305         time_t last_interim;
 306 } sessionlocalt;
 307
 308 #define SESSIONPFC      1       // PFC negotiated flags
 309 #define SESSIONACFC     2       // ACFC negotiated flags
 310
 311 // 168 bytes per tunnel
 312 typedef struct
 313 {
 314         tunnelidt far;          // far end tunnel ID
 315         in_addr_t ip;           // Ip for far end
 316         uint16_t port;          // port for far end
 317         uint16_t window;        // Rx window
 318         uint16_t nr;            // next receive
 319         uint16_t ns;            // next send
 320         int state;              // current state (tunnelstate enum)
 321         clockt last;            // when last control message sent (used for resend timeout)
 322         clockt retry;           // when to try resenting pending control
 323         clockt die;             // being closed, when to finally free
 324         clockt lastrec;         // when the last control message was received
 325         char hostname[128];     // tunnel hostname
 326         char vendor[128];       // LAC vendor
 327         uint8_t try;            // number of retrys on a control message
 328         uint16_t controlc;      // outstaind messages in queue
 329         controlt *controls;     // oldest message
 330         controlt *controle;     // newest message
 331 }
 332 tunnelt;
 333
 334 // 160 bytes per radius session
 335 typedef struct                  // outstanding RADIUS requests
 336 {
 337         sessionidt session;     // which session this applies to
 338         hasht auth;             // request authenticator
 339         clockt retry;           // when to try next
 340         char pass[129];         // password
 341         uint8_t id;             // ID for PPP response
 342         uint8_t try;            // which try we are on
 343         uint8_t state;          // state of radius requests
 344         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 345 }
 346 radiust;
 347
 348 typedef struct
 349 {
 350         in_addr_t       address;        // Host byte order..
 351         char            assigned;       // 1 if assigned, 0 if free
 352         sessionidt      session;
 353         clockt          last;           // last used
 354         char            user[129];      // user (try to have ip addresses persistent)
 355 }
 356 ippoolt;
 357
 358 #ifdef RINGBUFFER
 359 struct Tringbuffer
 360 {
 361         struct {
 362                 char level;
 363                 sessionidt session;
 364                 tunnelidt tunnel;
 365                 char message[MAX_LOG_LENGTH];
 366         } buffer[RINGBUFFER_SIZE];
 367         int head;
 368         int tail;
 369 };
 370 #endif
 371
 372 /*
 373  * Possible tunnel states
 374  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 375  */
 376 enum
 377 {
 378         TUNNELFREE,             // Not in use
 379         TUNNELOPEN,             // Active tunnel
 380         TUNNELDIE,              // Currently closing
 381         TUNNELOPENING,          // Busy opening
 382         TUNNELUNDEF,            // Undefined
 383 };
 384
 385 enum
 386 {
 387         RADIUSNULL,             // Not in use
 388         RADIUSCHAP,             // sending CHAP down PPP
 389         RADIUSAUTH,             // sending auth to RADIUS server
 390         RADIUSSTART,            // sending start accounting to RADIUS server
 391         RADIUSSTOP,             // sending stop accounting to RADIUS server
 392         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 393         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 394 };
 395
 396 struct Tstats
 397 {
 398     time_t      start_time;
 399     time_t      last_reset;
 400
 401     uint32_t    tun_rx_packets;
 402     uint32_t    tun_tx_packets;
 403     uint32_t    tun_rx_bytes;
 404     uint32_t    tun_tx_bytes;
 405     uint32_t    tun_rx_errors;
 406     uint32_t    tun_tx_errors;
 407     uint32_t    tun_rx_dropped;
 408
 409     uint32_t    tunnel_rx_packets;
 410     uint32_t    tunnel_tx_packets;
 411     uint32_t    tunnel_rx_bytes;
 412     uint32_t    tunnel_tx_bytes;
 413     uint32_t    tunnel_rx_errors;
 414     uint32_t    tunnel_tx_errors;
 415
 416     uint32_t    tunnel_retries;
 417     uint32_t    radius_retries;
 418
 419     uint32_t    arp_sent;
 420
 421     uint32_t    packets_snooped;
 422
 423     uint32_t    tunnel_created;
 424     uint32_t    session_created;
 425     uint32_t    tunnel_timeout;
 426     uint32_t    session_timeout;
 427     uint32_t    radius_timeout;
 428     uint32_t    radius_overflow;
 429     uint32_t    tunnel_overflow;
 430     uint32_t    session_overflow;
 431
 432     uint32_t    ip_allocated;
 433     uint32_t    ip_freed;
 434
 435     uint32_t    c_forwarded;
 436     uint32_t    recv_forward;
 437
 438     uint32_t    select_called;
 439     uint32_t    multi_read_used;
 440     uint32_t    multi_read_exceeded;
 441
 442 #ifdef STATISTICS
 443     uint32_t    call_processtun;
 444     uint32_t    call_processipout;
 445     uint32_t    call_processipv6out;
 446     uint32_t    call_processudp;
 447     uint32_t    call_sessionbyip;
 448     uint32_t    call_sessionbyipv6;
 449     uint32_t    call_sessionbyuser;
 450     uint32_t    call_sendarp;
 451     uint32_t    call_sendipcp;
 452     uint32_t    call_sendipv6cp;
 453     uint32_t    call_processipv6cp;
 454     uint32_t    call_tunnelsend;
 455     uint32_t    call_sessionkill;
 456     uint32_t    call_sessionshutdown;
 457     uint32_t    call_tunnelkill;
 458     uint32_t    call_tunnelshutdown;
 459     uint32_t    call_assign_ip_address;
 460     uint32_t    call_free_ip_address;
 461     uint32_t    call_dump_acct_info;
 462     uint32_t    call_sessionsetup;
 463     uint32_t    call_processpap;
 464     uint32_t    call_processchap;
 465     uint32_t    call_processlcp;
 466     uint32_t    call_processipcp;
 467     uint32_t    call_processipin;
 468     uint32_t    call_processipv6in;
 469     uint32_t    call_processccp;
 470     uint32_t    call_sendchap;
 471     uint32_t    call_processrad;
 472     uint32_t    call_radiussend;
 473     uint32_t    call_radiusretry;
 474     uint32_t    call_random_data;
 475 #endif
 476 };
 477
 478 #ifdef STATISTICS
 479
 480 #ifdef STAT_CALLS
 481 #define CSTAT(x)        STAT(call_ ## x)
 482 #else
 483 #define CSTAT(x)
 484 #endif
 485
 486 #define STAT(x)         (_statistics->x++)
 487 #define INC_STAT(x,y)   (_statistics->x += (y))
 488 #define GET_STAT(x)     (_statistics->x)
 489 #define SET_STAT(x, y)  (_statistics->x = (y))
 490 #else
 491 #define CSTAT(x)
 492 #define STAT(x)
 493 #define INC_STAT(x,y)
 494 #define GET_STAT(x)     0
 495 #define SET_STAT(x, y)
 496 #endif
 497
 498 typedef struct
 499 {
 500         int             debug;                          // debugging level
 501         time_t          start_time;                     // time when l2tpns was started
 502         char            bandwidth[256];                 // current bandwidth
 503         char            pid_file[256];                  // file to write PID to on startup
 504         int             wrote_pid;
 505         clockt          current_time;                   // 1/10ths of a second since the process started.
 506                                                         // means that we can only run a given process
 507                                                         // for 13 years without re-starting!
 508
 509         char            config_file[128];
 510         int             reload_config;                  // flag to re-read config (set by cli)
 511         int             multi_read_count;               // amount of packets to read per fd in processing loop
 512
 513         char            tundevice[10];                  // tun device name
 514         char            log_filename[128];
 515         char            l2tpsecret[64];
 516
 517         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 518
 519         int             ppp_restart_time;               // timeout for PPP restart
 520         int             ppp_max_configure;              // max lcp configure requests to send
 521         int             ppp_max_failure;                // max lcp configure naks to send
 522         int             ppp_mru;                        // MRU to advertise
 523
 524         char            radiussecret[64];
 525         int             radius_accounting;
 526         int             radius_interim;
 527         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 528         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 529         uint8_t         numradiusservers;               // radius server count
 530
 531         uint16_t        radius_dae_port;                // local port for radius dae
 532
 533         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 534         int             radius_authtypes;
 535         int             radius_authprefer;
 536
 537         int             allow_duplicate_users;          // allow multiple logins with the same username
 538
 539         in_addr_t       default_dns1, default_dns2;
 540
 541         unsigned long   rl_rate;                        // default throttle rate
 542         int             num_tbfs;                       // number of throttle buckets
 543
 544         char            accounting_dir[128];
 545         in_addr_t       bind_address;
 546         in_addr_t       peer_address;
 547         int             send_garp;                      // Set to true to garp for vip address on startup
 548
 549         int             target_uid;
 550         int             dump_speed;
 551         char            plugins[64][MAXPLUGINS];
 552         char            old_plugins[64][MAXPLUGINS];
 553
 554         int             next_tbf;                       // Next HTB id available to use
 555         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 556                                                         // policy for this process.
 557         int             lock_pages;                     // Lock pages into memory.
 558         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 559         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 560
 561         in_addr_t       cluster_address;                // Multicast address of cluster.
 562                                                         // Send to this address to have everyone hear.
 563         char            cluster_interface[64];          // Which interface to listen for multicast on.
 564         int             cluster_iam_master;             // Are we the cluster master???
 565         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 566         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 567                                                         // Zero if i am the cluster master.
 568         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 569                                                         // (or the seq number we're next expecting if we're a slave).
 570         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 571         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 572         int             cluster_highest_sessionid;
 573         int             cluster_highest_tunnelid;
 574         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 575         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 576         int             cluster_num_changes;            // Number of changes queued.
 577
 578         int             cluster_mcast_ttl;              // TTL for multicast packets
 579         int             cluster_hb_interval;            // How often to send a heartbeat.
 580         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 581         uint64_t        cluster_table_version;          // # state changes processed by cluster
 582
 583         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 584
 585
 586         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 587                                                         // slaves is less than this value.
 588
 589 #ifdef BGP
 590 #define BGP_NUM_PEERS   2
 591         uint16_t as_number;
 592         struct {
 593                 char name[64];
 594                 uint16_t as;
 595                 int keepalive;
 596                 int hold;
 597         } neighbour[BGP_NUM_PEERS];
 598 #endif
 599 } configt;
 600
 601 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 602 typedef struct
 603 {
 604         char *key;
 605         int offset;
 606         int size;
 607         enum config_typet type;
 608 } config_descriptt;
 609
 610 typedef struct
 611 {
 612         uint8_t op;     // operation
 613 #define FILTER_PORT_OP_NONE     0 // all ports match
 614 #define FILTER_PORT_OP_EQ       1
 615 #define FILTER_PORT_OP_NEQ      2
 616 #define FILTER_PORT_OP_GT       3
 617 #define FILTER_PORT_OP_LT       4
 618 #define FILTER_PORT_OP_RANGE    5
 619         uint16_t port;  // port (host byte order)
 620         uint16_t port2; // range
 621 } ip_filter_portt;
 622
 623 typedef struct
 624 {
 625         int action;             // permit/deny
 626 #define FILTER_ACTION_DENY      1
 627 #define FILTER_ACTION_PERMIT    2
 628         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 629         in_addr_t src_ip;       // source ip (network byte order)
 630         in_addr_t src_wild;
 631         ip_filter_portt src_ports;
 632         in_addr_t dst_ip;       // dest ip
 633         in_addr_t dst_wild;
 634         ip_filter_portt dst_ports;
 635         uint8_t frag;           // apply to non-initial fragments
 636         uint8_t tcp_flag_op;    // match type: any, all, established
 637 #define FILTER_FLAG_OP_ANY      1
 638 #define FILTER_FLAG_OP_ALL      2
 639 #define FILTER_FLAG_OP_EST      3
 640         uint8_t tcp_sflags;     // flags set
 641         uint8_t tcp_cflags;     // flags clear
 642         uint32_t counter;       // match count
 643 } ip_filter_rulet;
 644
 645 #define TCP_FLAG_FIN    0x01
 646 #define TCP_FLAG_SYN    0x02
 647 #define TCP_FLAG_RST    0x04
 648 #define TCP_FLAG_PSH    0x08
 649 #define TCP_FLAG_ACK    0x10
 650 #define TCP_FLAG_URG    0x20
 651
 652 #define MAXFILTER               32
 653 #define MAXFILTER_RULES         32
 654 typedef struct
 655 {
 656         char name[32];          // ACL name
 657         int extended;           // type: 0 = standard, 1 = extended
 658         ip_filter_rulet rules[MAXFILTER_RULES];
 659         int used;               // session ref count
 660 } ip_filtert;
 661
 662 // arp.c
 663 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 664
 665
 666 // ppp.c
 667 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 668 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 669 void lcp_open(sessionidt s, tunnelidt t);
 670 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 671 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 672 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 673 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 674 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 675 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 676 void sendchap(sessionidt s, tunnelidt t);
 677 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
 678 void sendlcp(sessionidt s, tunnelidt t);
 679 void send_ipin(sessionidt s, uint8_t *buf, int len);
 680 void sendccp(sessionidt s, tunnelidt t);
 681
 682
 683 // radius.c
 684 void initrad(void);
 685 void radiussend(uint16_t r, uint8_t state);
 686 void processrad(uint8_t *buf, int len, char socket_index);
 687 void radiusretry(uint16_t r);
 688 uint16_t radiusnew(sessionidt s);
 689 void radiusclear(uint16_t r, sessionidt s);
 690 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
 691
 692
 693 // l2tpns.c
 694 clockt backoff(uint8_t try);
 695 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 696 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 697 sessionidt sessionbyip(in_addr_t ip);
 698 sessionidt sessionbyipv6(struct in6_addr ip);
 699 sessionidt sessionbyuser(char *username);
 700 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 701 void random_data(uint8_t *buf, int len);
 702 void sessionkill(sessionidt s, char *reason);
 703 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 704 void filter_session(sessionidt s, int filter_in, int filter_out);
 705 void send_garp(in_addr_t ip);
 706 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 707 void sendipcp(sessionidt s, tunnelidt t);
 708 void sendipv6cp(sessionidt s, tunnelidt t);
 709 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 710 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 711 int find_filter(char const *name, size_t len);
 712 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 713 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 714 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 715 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 716
 717 #undef LOG
 718 #undef LOG_HEX
 719 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 720 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 721
 722 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 723 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 724
 725 int sessionsetup(sessionidt s, tunnelidt t);
 726 int run_plugins(int plugin_type, void *data);
 727 void rebuild_address_pool(void);
 728 void throttle_session(sessionidt s, int rate_in, int rate_out);
 729 int load_session(sessionidt, sessiont *);
 730 void become_master(void);       // We're the master; kick off any required master initializations.
 731
 732
 733 // cli.c
 734 void init_cli(char *hostname);
 735 void cli_do_file(FILE *fh);
 736 void cli_do(int sockfd);
 737 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 738
 739
 740 // icmp.c
 741 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 742
 743
 744 extern tunnelt *tunnel;
 745 extern sessiont *session;
 746 extern sessionlocalt *sess_local;
 747 extern ippoolt *ip_address_pool;
 748 #define sessionfree (session[0].next)
 749
 750 #define log_backtrace(count, max) \
 751 if (count++ < max) { \
 752         void *array[20]; \
 753         char **strings; \
 754         int size, i; \
 755         LOG(0, 0, t, "Backtrace follows:\n"); \
 756         size = backtrace(array, 10); \
 757         strings = backtrace_symbols(array, size); \
 758         if (strings) for (i = 0; i < size; i++) \
 759         { \
 760                 LOG(0, 0, t, " %s\n", strings[i]); \
 761         } \
 762         free(strings); \
 763 }
 764
 765
 766 extern configt *config;
 767 extern time_t basetime;         // Time when this process started.
 768 extern time_t time_now;         // Seconds since EPOCH.
 769 extern char main_quit;
 770 extern uint32_t last_id;
 771 extern struct Tstats *_statistics;
 772 extern in_addr_t my_address;
 773 extern int tun_write(uint8_t *data, int size);
 774 extern int clifd;
 775 extern int epollfd;
 776
 777 struct event_data {
 778         enum {
 779                 FD_TYPE_CLI,
 780                 FD_TYPE_CLUSTER,
 781                 FD_TYPE_TUN,
 782                 FD_TYPE_UDP,
 783                 FD_TYPE_CONTROL,
 784                 FD_TYPE_DAE,
 785                 FD_TYPE_RADIUS,
 786                 FD_TYPE_BGP,
 787         } type;
 788         int index; // for RADIUS, BGP
 789 };
 790
 791 #define TIME (config->current_time)
 792
 793 // macros for handling help in cli commands
 794 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 795 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 796
 797 // CVS identifiers (for "show version file")
 798 extern char const *cvs_id_arp;
 799 extern char const *cvs_id_cli;
 800 extern char const *cvs_id_cluster;
 801 extern char const *cvs_id_constants;
 802 extern char const *cvs_id_control;
 803 extern char const *cvs_id_icmp;
 804 extern char const *cvs_id_l2tpns;
 805 extern char const *cvs_id_ll;
 806 extern char const *cvs_id_md5;
 807 extern char const *cvs_id_ppp;
 808 extern char const *cvs_id_radius;
 809 extern char const *cvs_id_tbf;
 810 extern char const *cvs_id_util;
 811
 812 #endif /* __L2TPNS_H__ */