l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.113 2006-04-18 06:00:08 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 "2.1.18"
  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 =                         \
 151         sess_local[_s]._fsm.nak_sent = 0
 152
 153 // no more attempts
 154 #define zero_restart_count(_s, _fsm) ({                         \
 155         sess_local[_s]._fsm.conf_sent =                         \
 156                 config->ppp_max_configure;                      \
 157         sess_local[_s]._fsm.restart =                           \
 158                 time_now + config->ppp_restart_time;            \
 159 })
 160
 161 // increment ConfReq counter and reset timer
 162 #define restart_timer(_s, _fsm) ({                              \
 163         sess_local[_s]._fsm.conf_sent++;                        \
 164         sess_local[_s]._fsm.restart =                           \
 165                 time_now + config->ppp_restart_time;            \
 166 })
 167
 168 // stop timer on change to state where timer does not run
 169 #define change_state(_s, _fsm, _new) ({                         \
 170         if (_new != session[_s].ppp._fsm)                       \
 171         {                                                       \
 172                 switch (_new)                                   \
 173                 {                                               \
 174                 case Initial:                                   \
 175                 case Starting:                                  \
 176                 case Closed:                                    \
 177                 case Stopped:                                   \
 178                 case Opened:                                    \
 179                         sess_local[_s]._fsm.restart = 0;        \
 180                         initialise_restart_count(_s, _fsm);     \
 181                 }                                               \
 182                 session[_s].ppp._fsm = _new;                    \
 183                 cluster_send_session(_s);                       \
 184         }                                                       \
 185 })
 186
 187 // Types
 188 typedef uint16_t sessionidt;
 189 typedef uint16_t tunnelidt;
 190 typedef uint32_t clockt;
 191 typedef uint8_t hasht[16];
 192
 193 // CLI actions
 194 struct cli_session_actions {
 195         char action;
 196         in_addr_t snoop_ip;
 197         uint16_t snoop_port;
 198         int throttle_in;
 199         int throttle_out;
 200         int filter_in;
 201         int filter_out;
 202 };
 203
 204 #define CLI_SESS_KILL           0x01
 205 #define CLI_SESS_SNOOP          0x02
 206 #define CLI_SESS_NOSNOOP        0x04
 207 #define CLI_SESS_THROTTLE       0x08
 208 #define CLI_SESS_NOTHROTTLE     0x10
 209 #define CLI_SESS_FILTER         0x20
 210 #define CLI_SESS_NOFILTER       0x40
 211
 212 struct cli_tunnel_actions {
 213         char action;
 214 };
 215
 216 #define CLI_TUN_KILL            0x01
 217
 218 // structures
 219 typedef struct                  // route
 220 {
 221         in_addr_t ip;
 222         in_addr_t mask;
 223 }
 224 routet;
 225
 226 typedef struct controls         // control message
 227 {
 228         struct controls *next;  // next in queue
 229         uint16_t length;        // length
 230         uint8_t buf[MAXCONTROL];
 231 }
 232 controlt;
 233
 234 typedef struct
 235 {
 236         sessionidt next;                // next session in linked list
 237         sessionidt far;                 // far end session ID
 238         tunnelidt tunnel;               // near end tunnel ID
 239         uint8_t flags;                  // session flags: see SESSION_*
 240         struct {
 241                 uint8_t phase;          // PPP phase
 242                 uint8_t lcp:4;          //   LCP    state
 243                 uint8_t ipcp:4;         //   IPCP   state
 244                 uint8_t ipv6cp:4;       //   IPV6CP state
 245                 uint8_t ccp:4;          //   CCP    state
 246         } ppp;
 247         char reserved_1[2];             // unused: padding
 248         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 249         int ip_pool_index;              // index to IP pool
 250         uint32_t unique_id;             // unique session id
 251         char reserved_2[4];             // unused: was ns/nr
 252         uint32_t magic;                 // ppp magic number
 253         uint32_t pin, pout;             // packet counts
 254         uint32_t cin, cout;             // byte counts
 255         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 256         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 257         uint16_t throttle_in;           // upstream throttle rate (kbps)
 258         uint16_t throttle_out;          // downstream throttle rate
 259         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 260         uint8_t filter_out;             // output filter index
 261         uint16_t mru;                   // maximum receive unit
 262         clockt opened;                  // when started
 263         clockt die;                     // being closed, when to finally free
 264         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 265         in_addr_t dns1, dns2;           // DNS servers
 266         routet route[MAXROUTE];         // static routes
 267         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 268         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 269         int random_vector_length;
 270         uint8_t random_vector[MAXTEL];
 271         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 272         char called[MAXTEL];            // called number
 273         char calling[MAXTEL];           // calling number
 274         uint32_t tx_connect_speed;
 275         uint32_t rx_connect_speed;
 276         in_addr_t snoop_ip;             // Interception destination IP
 277         uint16_t snoop_port;            // Interception destination port
 278         uint8_t walled_garden;          // is this session gardened?
 279         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 280         struct in6_addr ipv6route;      // Static IPv6 route
 281         char reserved_3[11];            // Space to expand structure without changing HB_VERSION
 282 }
 283 sessiont;
 284
 285 #define AUTHPAP         1       // allow PAP
 286 #define AUTHCHAP        2       // allow CHAP
 287
 288 typedef struct
 289 {
 290         // packet counters
 291         uint32_t pin;
 292         uint32_t pout;
 293
 294         // byte counters
 295         uint32_t cin;
 296         uint32_t cout;
 297
 298         // PPP restart timer/counters
 299         struct {
 300                 time_t restart;
 301                 int conf_sent;
 302                 int nak_sent;
 303         } lcp, ipcp, ipv6cp, ccp;
 304
 305         // identifier for Protocol-Reject, Code-Reject
 306         uint8_t lcp_ident;
 307
 308         // authentication to use
 309         int lcp_authtype;
 310
 311         // our MRU
 312         uint16_t ppp_mru;
 313
 314         // DoS prevention
 315         clockt last_packet_out;
 316         uint32_t packets_out;
 317         uint32_t packets_dropped;
 318
 319         // RADIUS session in use
 320         uint16_t radius;
 321
 322         // interim RADIUS
 323         time_t last_interim;
 324
 325         // last LCP Echo
 326         time_t last_echo;
 327 } sessionlocalt;
 328
 329 // session flags
 330 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 331 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 332 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 333
 334 // 168 bytes per tunnel
 335 typedef struct
 336 {
 337         tunnelidt far;          // far end tunnel ID
 338         in_addr_t ip;           // Ip for far end
 339         uint16_t port;          // port for far end
 340         uint16_t window;        // Rx window
 341         uint16_t nr;            // next receive
 342         uint16_t ns;            // next send
 343         int state;              // current state (tunnelstate enum)
 344         clockt last;            // when last control message sent (used for resend timeout)
 345         clockt retry;           // when to try resending pending control
 346         clockt die;             // being closed, when to finally free
 347         clockt lastrec;         // when the last control message was received
 348         char hostname[128];     // tunnel hostname
 349         char vendor[128];       // LAC vendor
 350         uint8_t try;            // number of retrys on a control message
 351         uint16_t controlc;      // outstaind messages in queue
 352         controlt *controls;     // oldest message
 353         controlt *controle;     // newest message
 354 }
 355 tunnelt;
 356
 357 // 164 bytes per radius session
 358 typedef struct                  // outstanding RADIUS requests
 359 {
 360         sessionidt session;     // which session this applies to
 361         hasht auth;             // request authenticator
 362         clockt retry;           // when to try next
 363         char pass[129];         // password
 364         uint8_t id;             // ID for PPP response
 365         uint8_t try;            // which try we are on
 366         uint8_t state;          // state of radius requests
 367         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 368         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 369         char const *term_msg;   //   terminate reason
 370 }
 371 radiust;
 372
 373 typedef struct
 374 {
 375         in_addr_t       address;        // Host byte order..
 376         char            assigned;       // 1 if assigned, 0 if free
 377         sessionidt      session;
 378         clockt          last;           // last used
 379         char            user[129];      // user (try to have ip addresses persistent)
 380 }
 381 ippoolt;
 382
 383 #ifdef RINGBUFFER
 384 struct Tringbuffer
 385 {
 386         struct {
 387                 char level;
 388                 sessionidt session;
 389                 tunnelidt tunnel;
 390                 char message[MAX_LOG_LENGTH];
 391         } buffer[RINGBUFFER_SIZE];
 392         int head;
 393         int tail;
 394 };
 395 #endif
 396
 397 /*
 398  * Possible tunnel states
 399  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 400  */
 401 enum
 402 {
 403         TUNNELFREE,             // Not in use
 404         TUNNELOPEN,             // Active tunnel
 405         TUNNELDIE,              // Currently closing
 406         TUNNELOPENING,          // Busy opening
 407         TUNNELUNDEF,            // Undefined
 408 };
 409
 410 enum
 411 {
 412         RADIUSNULL,             // Not in use
 413         RADIUSCHAP,             // sending CHAP down PPP
 414         RADIUSAUTH,             // sending auth to RADIUS server
 415         RADIUSSTART,            // sending start accounting to RADIUS server
 416         RADIUSSTOP,             // sending stop accounting to RADIUS server
 417         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 418         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 419 };
 420
 421 struct Tstats
 422 {
 423     time_t      start_time;
 424     time_t      last_reset;
 425
 426     uint32_t    tun_rx_packets;
 427     uint32_t    tun_tx_packets;
 428     uint32_t    tun_rx_bytes;
 429     uint32_t    tun_tx_bytes;
 430     uint32_t    tun_rx_errors;
 431     uint32_t    tun_tx_errors;
 432     uint32_t    tun_rx_dropped;
 433
 434     uint32_t    tunnel_rx_packets;
 435     uint32_t    tunnel_tx_packets;
 436     uint32_t    tunnel_rx_bytes;
 437     uint32_t    tunnel_tx_bytes;
 438     uint32_t    tunnel_rx_errors;
 439     uint32_t    tunnel_tx_errors;
 440
 441     uint32_t    tunnel_retries;
 442     uint32_t    radius_retries;
 443
 444     uint32_t    arp_sent;
 445
 446     uint32_t    packets_snooped;
 447
 448     uint32_t    tunnel_created;
 449     uint32_t    session_created;
 450     uint32_t    tunnel_timeout;
 451     uint32_t    session_timeout;
 452     uint32_t    radius_timeout;
 453     uint32_t    radius_overflow;
 454     uint32_t    tunnel_overflow;
 455     uint32_t    session_overflow;
 456
 457     uint32_t    ip_allocated;
 458     uint32_t    ip_freed;
 459
 460     uint32_t    c_forwarded;
 461     uint32_t    recv_forward;
 462
 463     uint32_t    select_called;
 464     uint32_t    multi_read_used;
 465     uint32_t    multi_read_exceeded;
 466
 467 #ifdef STATISTICS
 468     uint32_t    call_processtun;
 469     uint32_t    call_processipout;
 470     uint32_t    call_processipv6out;
 471     uint32_t    call_processudp;
 472     uint32_t    call_sessionbyip;
 473     uint32_t    call_sessionbyipv6;
 474     uint32_t    call_sessionbyuser;
 475     uint32_t    call_sendarp;
 476     uint32_t    call_sendipcp;
 477     uint32_t    call_sendipv6cp;
 478     uint32_t    call_processipv6cp;
 479     uint32_t    call_tunnelsend;
 480     uint32_t    call_sessionkill;
 481     uint32_t    call_sessionshutdown;
 482     uint32_t    call_tunnelkill;
 483     uint32_t    call_tunnelshutdown;
 484     uint32_t    call_assign_ip_address;
 485     uint32_t    call_free_ip_address;
 486     uint32_t    call_dump_acct_info;
 487     uint32_t    call_sessionsetup;
 488     uint32_t    call_processpap;
 489     uint32_t    call_processchap;
 490     uint32_t    call_processlcp;
 491     uint32_t    call_processipcp;
 492     uint32_t    call_processipin;
 493     uint32_t    call_processipv6in;
 494     uint32_t    call_processccp;
 495     uint32_t    call_sendchap;
 496     uint32_t    call_processrad;
 497     uint32_t    call_radiussend;
 498     uint32_t    call_radiusretry;
 499     uint32_t    call_random_data;
 500 #endif
 501 };
 502
 503 #ifdef STATISTICS
 504
 505 #ifdef STAT_CALLS
 506 #define CSTAT(x)        STAT(call_ ## x)
 507 #else
 508 #define CSTAT(x)
 509 #endif
 510
 511 #define STAT(x)         (_statistics->x++)
 512 #define INC_STAT(x,y)   (_statistics->x += (y))
 513 #define GET_STAT(x)     (_statistics->x)
 514 #define SET_STAT(x, y)  (_statistics->x = (y))
 515 #else
 516 #define CSTAT(x)
 517 #define STAT(x)
 518 #define INC_STAT(x,y)
 519 #define GET_STAT(x)     0
 520 #define SET_STAT(x, y)
 521 #endif
 522
 523 typedef struct
 524 {
 525         int             debug;                          // debugging level
 526         time_t          start_time;                     // time when l2tpns was started
 527         char            bandwidth[256];                 // current bandwidth
 528         char            pid_file[256];                  // file to write PID to on startup
 529         int             wrote_pid;
 530         clockt          current_time;                   // 1/10ths of a second since the process started.
 531                                                         // means that we can only run a given process
 532                                                         // for 13 years without re-starting!
 533
 534         char            config_file[128];
 535         int             reload_config;                  // flag to re-read config (set by cli)
 536         int             multi_read_count;               // amount of packets to read per fd in processing loop
 537
 538         char            tundevice[10];                  // tun device name
 539         char            log_filename[128];
 540
 541         char            l2tp_secret[64];                // L2TP shared secret
 542         int             l2tp_mtu;                       // MTU of interface used for L2TP
 543
 544         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 545
 546         int             ppp_restart_time;               // timeout for PPP restart
 547         int             ppp_max_configure;              // max lcp configure requests to send
 548         int             ppp_max_failure;                // max lcp configure naks to send
 549
 550         char            radiussecret[64];
 551         int             radius_accounting;
 552         int             radius_interim;
 553         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 554         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 555         uint8_t         numradiusservers;               // radius server count
 556
 557         uint16_t        radius_dae_port;                // local port for radius dae
 558
 559         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 560         int             radius_authtypes;
 561         int             radius_authprefer;
 562
 563         int             allow_duplicate_users;          // allow multiple logins with the same username
 564
 565         in_addr_t       default_dns1, default_dns2;
 566
 567         unsigned long   rl_rate;                        // default throttle rate
 568         int             num_tbfs;                       // number of throttle buckets
 569
 570         char            accounting_dir[128];
 571         in_addr_t       bind_address;
 572         in_addr_t       peer_address;
 573         int             send_garp;                      // Set to true to garp for vip address on startup
 574
 575         int             target_uid;
 576         int             dump_speed;
 577         char            plugins[64][MAXPLUGINS];
 578         char            old_plugins[64][MAXPLUGINS];
 579
 580         int             next_tbf;                       // Next HTB id available to use
 581         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 582                                                         // policy for this process.
 583         int             lock_pages;                     // Lock pages into memory.
 584         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 585         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 586
 587         in_addr_t       cluster_address;                // Multicast address of cluster.
 588                                                         // Send to this address to have everyone hear.
 589         char            cluster_interface[64];          // Which interface to listen for multicast on.
 590         int             cluster_iam_master;             // Are we the cluster master???
 591         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 592         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 593                                                         // Zero if i am the cluster master.
 594         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 595                                                         // (or the seq number we're next expecting if we're a slave).
 596         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 597         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 598         int             cluster_highest_sessionid;
 599         int             cluster_highest_tunnelid;
 600         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 601         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 602         int             cluster_num_changes;            // Number of changes queued.
 603
 604         int             cluster_mcast_ttl;              // TTL for multicast packets
 605         int             cluster_hb_interval;            // How often to send a heartbeat.
 606         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 607         uint64_t        cluster_table_version;          // # state changes processed by cluster
 608
 609         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 610
 611
 612         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 613                                                         // slaves is less than this value.
 614
 615 #ifdef BGP
 616 #define BGP_NUM_PEERS   2
 617         uint16_t as_number;
 618         struct {
 619                 char name[64];
 620                 uint16_t as;
 621                 int keepalive;
 622                 int hold;
 623         } neighbour[BGP_NUM_PEERS];
 624 #endif
 625 } configt;
 626
 627 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 628 typedef struct
 629 {
 630         char *key;
 631         int offset;
 632         int size;
 633         enum config_typet type;
 634 } config_descriptt;
 635
 636 typedef struct
 637 {
 638         uint8_t op;     // operation
 639 #define FILTER_PORT_OP_NONE     0 // all ports match
 640 #define FILTER_PORT_OP_EQ       1
 641 #define FILTER_PORT_OP_NEQ      2
 642 #define FILTER_PORT_OP_GT       3
 643 #define FILTER_PORT_OP_LT       4
 644 #define FILTER_PORT_OP_RANGE    5
 645         uint16_t port;  // port (host byte order)
 646         uint16_t port2; // range
 647 } ip_filter_portt;
 648
 649 typedef struct
 650 {
 651         int action;             // permit/deny
 652 #define FILTER_ACTION_DENY      1
 653 #define FILTER_ACTION_PERMIT    2
 654         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 655         in_addr_t src_ip;       // source ip (network byte order)
 656         in_addr_t src_wild;
 657         ip_filter_portt src_ports;
 658         in_addr_t dst_ip;       // dest ip
 659         in_addr_t dst_wild;
 660         ip_filter_portt dst_ports;
 661         uint8_t frag;           // apply to non-initial fragments
 662         uint8_t tcp_flag_op;    // match type: any, all, established
 663 #define FILTER_FLAG_OP_ANY      1
 664 #define FILTER_FLAG_OP_ALL      2
 665 #define FILTER_FLAG_OP_EST      3
 666         uint8_t tcp_sflags;     // flags set
 667         uint8_t tcp_cflags;     // flags clear
 668         uint32_t counter;       // match count
 669 } ip_filter_rulet;
 670
 671 #define TCP_FLAG_FIN    0x01
 672 #define TCP_FLAG_SYN    0x02
 673 #define TCP_FLAG_RST    0x04
 674 #define TCP_FLAG_PSH    0x08
 675 #define TCP_FLAG_ACK    0x10
 676 #define TCP_FLAG_URG    0x20
 677
 678 #define MAXFILTER               32
 679 #define MAXFILTER_RULES         32
 680 typedef struct
 681 {
 682         char name[32];          // ACL name
 683         int extended;           // type: 0 = standard, 1 = extended
 684         ip_filter_rulet rules[MAXFILTER_RULES];
 685         int used;               // session ref count
 686 } ip_filtert;
 687
 688 // CDN result/error codes
 689 #define CDN_NONE                        0, 0
 690 #define CDN_TRY_ANOTHER                 2, 7
 691 #define CDN_ADMIN_DISC                  3, 0
 692 #define CDN_UNAVAILABLE                 4, 0
 693
 694 // RADIUS Acct-Terminate-Cause values
 695 #define TERM_USER_REQUEST               1
 696 #define TERM_LOST_CARRIER               2
 697 #define TERM_LOST_SERVICE               3
 698 #define TERM_IDLE_TIMEOUT               4
 699 #define TERM_SESSION_TIMEOUT            5
 700 #define TERM_ADMIN_RESET                6
 701 #define TERM_ADMIN_REBOOT               7
 702 #define TERM_PORT_ERROR                 8
 703 #define TERM_NAS_ERROR                  9
 704 #define TERM_NAS_REQUEST                10
 705 #define TERM_NAS_REBOOT                 11
 706 #define TERM_PORT_UNNEEDED              12
 707 #define TERM_PORT_PREEMPTED             13
 708 #define TERM_PORT_SUSPENDED             14
 709 #define TERM_SERVICE_UNAVAILABLE        15
 710 #define TERM_CALLBACK                   16
 711 #define TERM_USER_ERROR                 17
 712 #define TERM_HOST_REQUEST               18
 713 #define TERM_SUPPLICANT_RESTART         19
 714 #define TERM_REAUTHENTICATION_FAILURE   20
 715 #define TERM_PORT_REINIT                21
 716 #define TERM_PORT_DISABLED              22
 717
 718 // arp.c
 719 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 720
 721
 722 // ppp.c
 723 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 724 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 725 void lcp_open(sessionidt s, tunnelidt t);
 726 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 727 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 728 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 729 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 730 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 731 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 732 void sendchap(sessionidt s, tunnelidt t);
 733 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
 734 void sendlcp(sessionidt s, tunnelidt t);
 735 void send_ipin(sessionidt s, uint8_t *buf, int len);
 736 void sendccp(sessionidt s, tunnelidt t);
 737 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 738
 739
 740 // radius.c
 741 void initrad(void);
 742 void radiussend(uint16_t r, uint8_t state);
 743 void processrad(uint8_t *buf, int len, char socket_index);
 744 void radiusretry(uint16_t r);
 745 uint16_t radiusnew(sessionidt s);
 746 void radiusclear(uint16_t r, sessionidt s);
 747 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 748
 749
 750 // l2tpns.c
 751 clockt backoff(uint8_t try);
 752 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 753 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 754 sessionidt sessionbyip(in_addr_t ip);
 755 sessionidt sessionbyipv6(struct in6_addr ip);
 756 sessionidt sessionbyuser(char *username);
 757 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 758 void random_data(uint8_t *buf, int len);
 759 void sessionkill(sessionidt s, char *reason);
 760 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 761 void filter_session(sessionidt s, int filter_in, int filter_out);
 762 void send_garp(in_addr_t ip);
 763 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 764 int tun_write(uint8_t *data, int size);
 765 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 766 void sendipcp(sessionidt s, tunnelidt t);
 767 void sendipv6cp(sessionidt s, tunnelidt t);
 768 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 769 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 770 int find_filter(char const *name, size_t len);
 771 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 772 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 773 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 774 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 775
 776 #undef LOG
 777 #undef LOG_HEX
 778 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 779 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 780
 781 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 782 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 783
 784
 785 int sessionsetup(sessionidt s, tunnelidt t);
 786 int run_plugins(int plugin_type, void *data);
 787 void rebuild_address_pool(void);
 788 void throttle_session(sessionidt s, int rate_in, int rate_out);
 789 int load_session(sessionidt, sessiont *);
 790 void become_master(void);       // We're the master; kick off any required master initializations.
 791
 792
 793 // cli.c
 794 void init_cli(char *hostname);
 795 void cli_do_file(FILE *fh);
 796 void cli_do(int sockfd);
 797 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 798
 799
 800 // icmp.c
 801 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 802
 803
 804 extern tunnelt *tunnel;
 805 extern sessiont *session;
 806 extern sessionlocalt *sess_local;
 807 extern ippoolt *ip_address_pool;
 808 #define sessionfree (session[0].next)
 809
 810
 811 extern configt *config;
 812 extern time_t basetime;         // Time when this process started.
 813 extern time_t time_now;         // Seconds since EPOCH.
 814 extern char main_quit;
 815 extern uint32_t last_id;
 816 extern struct Tstats *_statistics;
 817 extern in_addr_t my_address;
 818 extern int clifd;
 819 extern int epollfd;
 820
 821 struct event_data {
 822         enum {
 823                 FD_TYPE_CLI,
 824                 FD_TYPE_CLUSTER,
 825                 FD_TYPE_TUN,
 826                 FD_TYPE_UDP,
 827                 FD_TYPE_CONTROL,
 828                 FD_TYPE_DAE,
 829                 FD_TYPE_RADIUS,
 830                 FD_TYPE_BGP,
 831         } type;
 832         int index; // for RADIUS, BGP
 833 };
 834
 835 #define TIME (config->current_time)
 836
 837 extern uint16_t MRU;
 838 extern uint16_t MSS;
 839
 840 // macros for handling help in cli commands
 841 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 842 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 843
 844 // CVS identifiers (for "show version file")
 845 extern char const *cvs_id_arp;
 846 extern char const *cvs_id_cli;
 847 extern char const *cvs_id_cluster;
 848 extern char const *cvs_id_constants;
 849 extern char const *cvs_id_control;
 850 extern char const *cvs_id_icmp;
 851 extern char const *cvs_id_l2tpns;
 852 extern char const *cvs_id_ll;
 853 extern char const *cvs_id_md5;
 854 extern char const *cvs_id_ppp;
 855 extern char const *cvs_id_radius;
 856 extern char const *cvs_id_tbf;
 857 extern char const *cvs_id_util;
 858
 859 #endif /* __L2TPNS_H__ */