l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.109 2005/12/20 04:57:16 bodea Exp $
   3
   4 #ifndef __L2TPNS_H__
   5 #define __L2TPNS_H__
   6
   7 #include <netinet/in.h>
   8 #include <stdio.h>
   9 #include <signal.h>
  10 #include <stdlib.h>
  11 #include <netinet/in.h>
  12 #include <sys/socket.h>
  13 #include <arpa/inet.h>
  14 #include <sys/types.h>
  15 #include <libcli.h>
  16
  17 #define VERSION "2.1.16"
  18
  19 // Limits
  20 #define MAXTUNNEL       500             // could be up to 65535
  21 #define MAXSESSION      60000           // could be up to 65535
  22 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  23
  24 #define RADIUS_SHIFT    6
  25 #define RADIUS_FDS      (1 << RADIUS_SHIFT)
  26 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  27 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  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 MINMTU          576             // minimum recommended MTU (rfc1063)
  34 #define MAXMTU          2600            // arbitrary maximum MTU
  35 #define PPPoE_MRU       1492            // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
  36 #define MAXETHER        (MAXMTU+18)     // max packet we try sending to tun
  37 #define MAXTEL          96              // telephone number
  38 #define MAXUSER         128             // username
  39 #define MAXPASS         128             // password
  40 #define MAXPLUGINS      20              // maximum number of plugins to load
  41 #define MAXRADSERVER    10              // max radius servers
  42 #define MAXROUTE        10              // max static routes per session
  43 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  44 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  45 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  46 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  47 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  48 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  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 = 0
 151
 152 // increment ConfReq counter and reset timer
 153 #define restart_timer(_s, _fsm) ({                              \
 154         sess_local[_s]._fsm.conf_sent++;                        \
 155         sess_local[_s]._fsm.restart =                           \
 156                 time_now + config->ppp_restart_time;            \
 157 })
 158
 159 // stop timer on change to state where timer does not run
 160 #define change_state(_s, _fsm, _new) ({                         \
 161         if (_new != session[_s].ppp._fsm)                       \
 162         {                                                       \
 163                 switch (_new)                                   \
 164                 {                                               \
 165                 case Initial:                                   \
 166                 case Starting:                                  \
 167                 case Closed:                                    \
 168                 case Stopped:                                   \
 169                 case Opened:                                    \
 170                         sess_local[_s]._fsm.restart = 0;        \
 171                         initialise_restart_count(_s, _fsm);     \
 172                 }                                               \
 173                 session[_s].ppp._fsm = _new;                    \
 174                 cluster_send_session(_s);                       \
 175         }                                                       \
 176 })
 177
 178 // Types
 179 typedef uint16_t sessionidt;
 180 typedef uint16_t tunnelidt;
 181 typedef uint32_t clockt;
 182 typedef uint8_t hasht[16];
 183
 184 // CLI actions
 185 struct cli_session_actions {
 186         char action;
 187         in_addr_t snoop_ip;
 188         uint16_t snoop_port;
 189         int throttle_in;
 190         int throttle_out;
 191         int filter_in;
 192         int filter_out;
 193 };
 194
 195 #define CLI_SESS_KILL           0x01
 196 #define CLI_SESS_SNOOP          0x02
 197 #define CLI_SESS_NOSNOOP        0x04
 198 #define CLI_SESS_THROTTLE       0x08
 199 #define CLI_SESS_NOTHROTTLE     0x10
 200 #define CLI_SESS_FILTER         0x20
 201 #define CLI_SESS_NOFILTER       0x40
 202
 203 struct cli_tunnel_actions {
 204         char action;
 205 };
 206
 207 #define CLI_TUN_KILL            0x01
 208
 209 // structures
 210 typedef struct                  // route
 211 {
 212         in_addr_t ip;
 213         in_addr_t mask;
 214 }
 215 routet;
 216
 217 typedef struct controls         // control message
 218 {
 219         struct controls *next;  // next in queue
 220         uint16_t length;        // length
 221         uint8_t buf[MAXCONTROL];
 222 }
 223 controlt;
 224
 225 typedef struct
 226 {
 227         sessionidt next;                // next session in linked list
 228         sessionidt far;                 // far end session ID
 229         tunnelidt tunnel;               // near end tunnel ID
 230         uint8_t flags;                  // session flags: see SESSION_*
 231         struct {
 232                 uint8_t phase;          // PPP phase
 233                 uint8_t lcp:4;          //   LCP    state
 234                 uint8_t ipcp:4;         //   IPCP   state
 235                 uint8_t ipv6cp:4;       //   IPV6CP state
 236                 uint8_t ccp:4;          //   CCP    state
 237         } ppp;
 238         char reserved_1[2];             // unused: padding
 239         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 240         int ip_pool_index;              // index to IP pool
 241         uint32_t unique_id;             // unique session id
 242         char reserved_2[4];             // unused: was ns/nr
 243         uint32_t magic;                 // ppp magic number
 244         uint32_t pin, pout;             // packet counts
 245         uint32_t cin, cout;             // byte counts
 246         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 247         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 248         uint16_t throttle_in;           // upstream throttle rate (kbps)
 249         uint16_t throttle_out;          // downstream throttle rate
 250         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 251         uint8_t filter_out;             // output filter index
 252         uint16_t mru;                   // maximum receive unit
 253         clockt opened;                  // when started
 254         clockt die;                     // being closed, when to finally free
 255         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 256         in_addr_t dns1, dns2;           // DNS servers
 257         routet route[MAXROUTE];         // static routes
 258         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 259         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 260         int random_vector_length;
 261         uint8_t random_vector[MAXTEL];
 262         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 263         char called[MAXTEL];            // called number
 264         char calling[MAXTEL];           // calling number
 265         uint32_t tx_connect_speed;
 266         uint32_t rx_connect_speed;
 267         in_addr_t snoop_ip;             // Interception destination IP
 268         uint16_t snoop_port;            // Interception destination port
 269         uint8_t walled_garden;          // is this session gardened?
 270         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 271         struct in6_addr ipv6route;      // Static IPv6 route
 272         char reserved_3[11];            // Space to expand structure without changing HB_VERSION
 273 }
 274 sessiont;
 275
 276 #define AUTHPAP         1       // allow PAP
 277 #define AUTHCHAP        2       // allow CHAP
 278
 279 typedef struct
 280 {
 281         // packet counters
 282         uint32_t pin;
 283         uint32_t pout;
 284
 285         // byte counters
 286         uint32_t cin;
 287         uint32_t cout;
 288
 289         // PPP restart timer/counters
 290         struct {
 291                 time_t restart;
 292                 int conf_sent;
 293                 int nak_sent;
 294         } lcp, ipcp, ipv6cp, ccp;
 295
 296         // identifier for Protocol-Reject, Code-Reject
 297         uint8_t lcp_ident;
 298
 299         // authentication to use
 300         int lcp_authtype;
 301
 302         // our MRU
 303         uint16_t ppp_mru;
 304
 305         // DoS prevention
 306         clockt last_packet_out;
 307         uint32_t packets_out;
 308         uint32_t packets_dropped;
 309
 310         // RADIUS session in use
 311         uint16_t radius;
 312
 313         // interim RADIUS
 314         time_t last_interim;
 315
 316         // last LCP Echo
 317         time_t last_echo;
 318 } sessionlocalt;
 319
 320 // session flags
 321 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 322 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 323 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 324
 325 // 168 bytes per tunnel
 326 typedef struct
 327 {
 328         tunnelidt far;          // far end tunnel ID
 329         in_addr_t ip;           // Ip for far end
 330         uint16_t port;          // port for far end
 331         uint16_t window;        // Rx window
 332         uint16_t nr;            // next receive
 333         uint16_t ns;            // next send
 334         int state;              // current state (tunnelstate enum)
 335         clockt last;            // when last control message sent (used for resend timeout)
 336         clockt retry;           // when to try resending pending control
 337         clockt die;             // being closed, when to finally free
 338         clockt lastrec;         // when the last control message was received
 339         char hostname[128];     // tunnel hostname
 340         char vendor[128];       // LAC vendor
 341         uint8_t try;            // number of retrys on a control message
 342         uint16_t controlc;      // outstaind messages in queue
 343         controlt *controls;     // oldest message
 344         controlt *controle;     // newest message
 345 }
 346 tunnelt;
 347
 348 // 160 bytes per radius session
 349 typedef struct                  // outstanding RADIUS requests
 350 {
 351         sessionidt session;     // which session this applies to
 352         hasht auth;             // request authenticator
 353         clockt retry;           // when to try next
 354         char pass[129];         // password
 355         uint8_t id;             // ID for PPP response
 356         uint8_t try;            // which try we are on
 357         uint8_t state;          // state of radius requests
 358         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 359 }
 360 radiust;
 361
 362 typedef struct
 363 {
 364         in_addr_t       address;        // Host byte order..
 365         char            assigned;       // 1 if assigned, 0 if free
 366         sessionidt      session;
 367         clockt          last;           // last used
 368         char            user[129];      // user (try to have ip addresses persistent)
 369 }
 370 ippoolt;
 371
 372 #ifdef RINGBUFFER
 373 struct Tringbuffer
 374 {
 375         struct {
 376                 char level;
 377                 sessionidt session;
 378                 tunnelidt tunnel;
 379                 char message[MAX_LOG_LENGTH];
 380         } buffer[RINGBUFFER_SIZE];
 381         int head;
 382         int tail;
 383 };
 384 #endif
 385
 386 /*
 387  * Possible tunnel states
 388  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 389  */
 390 enum
 391 {
 392         TUNNELFREE,             // Not in use
 393         TUNNELOPEN,             // Active tunnel
 394         TUNNELDIE,              // Currently closing
 395         TUNNELOPENING,          // Busy opening
 396         TUNNELUNDEF,            // Undefined
 397 };
 398
 399 enum
 400 {
 401         RADIUSNULL,             // Not in use
 402         RADIUSCHAP,             // sending CHAP down PPP
 403         RADIUSAUTH,             // sending auth to RADIUS server
 404         RADIUSSTART,            // sending start accounting to RADIUS server
 405         RADIUSSTOP,             // sending stop accounting to RADIUS server
 406         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 407         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 408 };
 409
 410 struct Tstats
 411 {
 412     time_t      start_time;
 413     time_t      last_reset;
 414
 415     uint32_t    tun_rx_packets;
 416     uint32_t    tun_tx_packets;
 417     uint32_t    tun_rx_bytes;
 418     uint32_t    tun_tx_bytes;
 419     uint32_t    tun_rx_errors;
 420     uint32_t    tun_tx_errors;
 421     uint32_t    tun_rx_dropped;
 422
 423     uint32_t    tunnel_rx_packets;
 424     uint32_t    tunnel_tx_packets;
 425     uint32_t    tunnel_rx_bytes;
 426     uint32_t    tunnel_tx_bytes;
 427     uint32_t    tunnel_rx_errors;
 428     uint32_t    tunnel_tx_errors;
 429
 430     uint32_t    tunnel_retries;
 431     uint32_t    radius_retries;
 432
 433     uint32_t    arp_sent;
 434
 435     uint32_t    packets_snooped;
 436
 437     uint32_t    tunnel_created;
 438     uint32_t    session_created;
 439     uint32_t    tunnel_timeout;
 440     uint32_t    session_timeout;
 441     uint32_t    radius_timeout;
 442     uint32_t    radius_overflow;
 443     uint32_t    tunnel_overflow;
 444     uint32_t    session_overflow;
 445
 446     uint32_t    ip_allocated;
 447     uint32_t    ip_freed;
 448
 449     uint32_t    c_forwarded;
 450     uint32_t    recv_forward;
 451
 452     uint32_t    select_called;
 453     uint32_t    multi_read_used;
 454     uint32_t    multi_read_exceeded;
 455
 456 #ifdef STATISTICS
 457     uint32_t    call_processtun;
 458     uint32_t    call_processipout;
 459     uint32_t    call_processipv6out;
 460     uint32_t    call_processudp;
 461     uint32_t    call_sessionbyip;
 462     uint32_t    call_sessionbyipv6;
 463     uint32_t    call_sessionbyuser;
 464     uint32_t    call_sendarp;
 465     uint32_t    call_sendipcp;
 466     uint32_t    call_sendipv6cp;
 467     uint32_t    call_processipv6cp;
 468     uint32_t    call_tunnelsend;
 469     uint32_t    call_sessionkill;
 470     uint32_t    call_sessionshutdown;
 471     uint32_t    call_tunnelkill;
 472     uint32_t    call_tunnelshutdown;
 473     uint32_t    call_assign_ip_address;
 474     uint32_t    call_free_ip_address;
 475     uint32_t    call_dump_acct_info;
 476     uint32_t    call_sessionsetup;
 477     uint32_t    call_processpap;
 478     uint32_t    call_processchap;
 479     uint32_t    call_processlcp;
 480     uint32_t    call_processipcp;
 481     uint32_t    call_processipin;
 482     uint32_t    call_processipv6in;
 483     uint32_t    call_processccp;
 484     uint32_t    call_sendchap;
 485     uint32_t    call_processrad;
 486     uint32_t    call_radiussend;
 487     uint32_t    call_radiusretry;
 488     uint32_t    call_random_data;
 489 #endif
 490 };
 491
 492 #ifdef STATISTICS
 493
 494 #ifdef STAT_CALLS
 495 #define CSTAT(x)        STAT(call_ ## x)
 496 #else
 497 #define CSTAT(x)
 498 #endif
 499
 500 #define STAT(x)         (_statistics->x++)
 501 #define INC_STAT(x,y)   (_statistics->x += (y))
 502 #define GET_STAT(x)     (_statistics->x)
 503 #define SET_STAT(x, y)  (_statistics->x = (y))
 504 #else
 505 #define CSTAT(x)
 506 #define STAT(x)
 507 #define INC_STAT(x,y)
 508 #define GET_STAT(x)     0
 509 #define SET_STAT(x, y)
 510 #endif
 511
 512 typedef struct
 513 {
 514         int             debug;                          // debugging level
 515         time_t          start_time;                     // time when l2tpns was started
 516         char            bandwidth[256];                 // current bandwidth
 517         char            pid_file[256];                  // file to write PID to on startup
 518         int             wrote_pid;
 519         clockt          current_time;                   // 1/10ths of a second since the process started.
 520                                                         // means that we can only run a given process
 521                                                         // for 13 years without re-starting!
 522
 523         char            config_file[128];
 524         int             reload_config;                  // flag to re-read config (set by cli)
 525         int             multi_read_count;               // amount of packets to read per fd in processing loop
 526
 527         char            tundevice[10];                  // tun device name
 528         char            log_filename[128];
 529
 530         char            l2tp_secret[64];                // L2TP shared secret
 531         int             l2tp_mtu;                       // MTU of interface used for L2TP
 532
 533         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 534
 535         int             ppp_restart_time;               // timeout for PPP restart
 536         int             ppp_max_configure;              // max lcp configure requests to send
 537         int             ppp_max_failure;                // max lcp configure naks to send
 538
 539         char            radiussecret[64];
 540         int             radius_accounting;
 541         int             radius_interim;
 542         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 543         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 544         uint8_t         numradiusservers;               // radius server count
 545
 546         uint16_t        radius_dae_port;                // local port for radius dae
 547
 548         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 549         int             radius_authtypes;
 550         int             radius_authprefer;
 551
 552         int             allow_duplicate_users;          // allow multiple logins with the same username
 553
 554         in_addr_t       default_dns1, default_dns2;
 555
 556         unsigned long   rl_rate;                        // default throttle rate
 557         int             num_tbfs;                       // number of throttle buckets
 558
 559         char            accounting_dir[128];
 560         in_addr_t       bind_address;
 561         in_addr_t       peer_address;
 562         int             send_garp;                      // Set to true to garp for vip address on startup
 563
 564         int             target_uid;
 565         int             dump_speed;
 566         char            plugins[64][MAXPLUGINS];
 567         char            old_plugins[64][MAXPLUGINS];
 568
 569         int             next_tbf;                       // Next HTB id available to use
 570         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 571                                                         // policy for this process.
 572         int             lock_pages;                     // Lock pages into memory.
 573         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 574         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 575
 576         in_addr_t       cluster_address;                // Multicast address of cluster.
 577                                                         // Send to this address to have everyone hear.
 578         char            cluster_interface[64];          // Which interface to listen for multicast on.
 579         int             cluster_iam_master;             // Are we the cluster master???
 580         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 581         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 582                                                         // Zero if i am the cluster master.
 583         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 584                                                         // (or the seq number we're next expecting if we're a slave).
 585         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 586         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 587         int             cluster_highest_sessionid;
 588         int             cluster_highest_tunnelid;
 589         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 590         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 591         int             cluster_num_changes;            // Number of changes queued.
 592
 593         int             cluster_mcast_ttl;              // TTL for multicast packets
 594         int             cluster_hb_interval;            // How often to send a heartbeat.
 595         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 596         uint64_t        cluster_table_version;          // # state changes processed by cluster
 597
 598         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 599
 600
 601         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 602                                                         // slaves is less than this value.
 603
 604 #ifdef BGP
 605 #define BGP_NUM_PEERS   2
 606         uint16_t as_number;
 607         struct {
 608                 char name[64];
 609                 uint16_t as;
 610                 int keepalive;
 611                 int hold;
 612         } neighbour[BGP_NUM_PEERS];
 613 #endif
 614 } configt;
 615
 616 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 617 typedef struct
 618 {
 619         char *key;
 620         int offset;
 621         int size;
 622         enum config_typet type;
 623 } config_descriptt;
 624
 625 typedef struct
 626 {
 627         uint8_t op;     // operation
 628 #define FILTER_PORT_OP_NONE     0 // all ports match
 629 #define FILTER_PORT_OP_EQ       1
 630 #define FILTER_PORT_OP_NEQ      2
 631 #define FILTER_PORT_OP_GT       3
 632 #define FILTER_PORT_OP_LT       4
 633 #define FILTER_PORT_OP_RANGE    5
 634         uint16_t port;  // port (host byte order)
 635         uint16_t port2; // range
 636 } ip_filter_portt;
 637
 638 typedef struct
 639 {
 640         int action;             // permit/deny
 641 #define FILTER_ACTION_DENY      1
 642 #define FILTER_ACTION_PERMIT    2
 643         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 644         in_addr_t src_ip;       // source ip (network byte order)
 645         in_addr_t src_wild;
 646         ip_filter_portt src_ports;
 647         in_addr_t dst_ip;       // dest ip
 648         in_addr_t dst_wild;
 649         ip_filter_portt dst_ports;
 650         uint8_t frag;           // apply to non-initial fragments
 651         uint8_t tcp_flag_op;    // match type: any, all, established
 652 #define FILTER_FLAG_OP_ANY      1
 653 #define FILTER_FLAG_OP_ALL      2
 654 #define FILTER_FLAG_OP_EST      3
 655         uint8_t tcp_sflags;     // flags set
 656         uint8_t tcp_cflags;     // flags clear
 657         uint32_t counter;       // match count
 658 } ip_filter_rulet;
 659
 660 #define TCP_FLAG_FIN    0x01
 661 #define TCP_FLAG_SYN    0x02
 662 #define TCP_FLAG_RST    0x04
 663 #define TCP_FLAG_PSH    0x08
 664 #define TCP_FLAG_ACK    0x10
 665 #define TCP_FLAG_URG    0x20
 666
 667 #define MAXFILTER               32
 668 #define MAXFILTER_RULES         32
 669 typedef struct
 670 {
 671         char name[32];          // ACL name
 672         int extended;           // type: 0 = standard, 1 = extended
 673         ip_filter_rulet rules[MAXFILTER_RULES];
 674         int used;               // session ref count
 675 } ip_filtert;
 676
 677 // arp.c
 678 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 679
 680
 681 // ppp.c
 682 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 683 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 684 void lcp_open(sessionidt s, tunnelidt t);
 685 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 686 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 687 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 688 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 689 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 690 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 691 void sendchap(sessionidt s, tunnelidt t);
 692 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
 693 void sendlcp(sessionidt s, tunnelidt t);
 694 void send_ipin(sessionidt s, uint8_t *buf, int len);
 695 void sendccp(sessionidt s, tunnelidt t);
 696 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 697
 698
 699 // radius.c
 700 void initrad(void);
 701 void radiussend(uint16_t r, uint8_t state);
 702 void processrad(uint8_t *buf, int len, char socket_index);
 703 void radiusretry(uint16_t r);
 704 uint16_t radiusnew(sessionidt s);
 705 void radiusclear(uint16_t r, sessionidt s);
 706 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
 707
 708
 709 // l2tpns.c
 710 clockt backoff(uint8_t try);
 711 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 712 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 713 sessionidt sessionbyip(in_addr_t ip);
 714 sessionidt sessionbyipv6(struct in6_addr ip);
 715 sessionidt sessionbyuser(char *username);
 716 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 717 void random_data(uint8_t *buf, int len);
 718 void sessionkill(sessionidt s, char *reason);
 719 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 720 void filter_session(sessionidt s, int filter_in, int filter_out);
 721 void send_garp(in_addr_t ip);
 722 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 723 int tun_write(uint8_t *data, int size);
 724 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 725 void sendipcp(sessionidt s, tunnelidt t);
 726 void sendipv6cp(sessionidt s, tunnelidt t);
 727 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 728 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 729 int find_filter(char const *name, size_t len);
 730 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 731 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 732 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 733 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 734
 735 #undef LOG
 736 #undef LOG_HEX
 737 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 738 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 739
 740 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 741 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 742
 743
 744 int sessionsetup(sessionidt s, tunnelidt t);
 745 int run_plugins(int plugin_type, void *data);
 746 void rebuild_address_pool(void);
 747 void throttle_session(sessionidt s, int rate_in, int rate_out);
 748 int load_session(sessionidt, sessiont *);
 749 void become_master(void);       // We're the master; kick off any required master initializations.
 750
 751
 752 // cli.c
 753 void init_cli(char *hostname);
 754 void cli_do_file(FILE *fh);
 755 void cli_do(int sockfd);
 756 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 757
 758
 759 // icmp.c
 760 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 761
 762
 763 extern tunnelt *tunnel;
 764 extern sessiont *session;
 765 extern sessionlocalt *sess_local;
 766 extern ippoolt *ip_address_pool;
 767 #define sessionfree (session[0].next)
 768
 769
 770 extern configt *config;
 771 extern time_t basetime;         // Time when this process started.
 772 extern time_t time_now;         // Seconds since EPOCH.
 773 extern char main_quit;
 774 extern uint32_t last_id;
 775 extern struct Tstats *_statistics;
 776 extern in_addr_t my_address;
 777 extern int clifd;
 778 extern int epollfd;
 779
 780 struct event_data {
 781         enum {
 782                 FD_TYPE_CLI,
 783                 FD_TYPE_CLUSTER,
 784                 FD_TYPE_TUN,
 785                 FD_TYPE_UDP,
 786                 FD_TYPE_CONTROL,
 787                 FD_TYPE_DAE,
 788                 FD_TYPE_RADIUS,
 789                 FD_TYPE_BGP,
 790         } type;
 791         int index; // for RADIUS, BGP
 792 };
 793
 794 #define TIME (config->current_time)
 795
 796 extern uint16_t MRU;
 797 extern uint16_t MSS;
 798
 799 // macros for handling help in cli commands
 800 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 801 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 802
 803 // CVS identifiers (for "show version file")
 804 extern char const *cvs_id_arp;
 805 extern char const *cvs_id_cli;
 806 extern char const *cvs_id_cluster;
 807 extern char const *cvs_id_constants;
 808 extern char const *cvs_id_control;
 809 extern char const *cvs_id_icmp;
 810 extern char const *cvs_id_l2tpns;
 811 extern char const *cvs_id_ll;
 812 extern char const *cvs_id_md5;
 813 extern char const *cvs_id_ppp;
 814 extern char const *cvs_id_radius;
 815 extern char const *cvs_id_tbf;
 816 extern char const *cvs_id_util;
 817
 818 #endif /* __L2TPNS_H__ */