l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.115 2006/04/27 09:53:50 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 "2.2.0"
  18
  19 // Limits
  20 #define MAXTUNNEL       500             // could be up to 65535
  21 #define MAXBUNDLE       300             // could be up to 65535
  22 #define MAXBUNDLESES    10              // Maximum number of member links in bundle
  23 #define MAXADDRESS      20              // Maximum length for the Endpoint Discrminiator address
  24 #define MAXFRAGNUM      1500            // Maximum number of Multilink fragment in a bundle
  25 #define MAXFRAGLEN      1000            // Maximum length for Multilink fragment
  26 #define MAXSESSION      60000           // could be up to 65535
  27 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  28
  29 #define RADIUS_SHIFT    6
  30 #define RADIUS_FDS      (1 << RADIUS_SHIFT)
  31 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  32 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  33
  34 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  35 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  36
  37 #define MAXCONTROL      1000            // max length control message we ever send...
  38 #define MINMTU          576             // minimum recommended MTU (rfc1063)
  39 #define MAXMTU          2600            // arbitrary maximum MTU
  40 #define PPPoE_MRU       1492            // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
  41 #define MAXETHER        (MAXMTU+18)     // max packet we try sending to tun
  42 #define MAXTEL          96              // telephone number
  43 #define MAXUSER         128             // username
  44 #define MAXPASS         128             // password
  45 #define MAXPLUGINS      20              // maximum number of plugins to load
  46 #define MAXRADSERVER    10              // max radius servers
  47 #define MAXROUTE        10              // max static routes per session
  48 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  49 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  50 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  51 #define ECHO_TIMEOUT    10              // Time between last packet sent and LCP ECHO generation
  52 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  53 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  54
  55 #define MP_BEGIN        0x80            // This value is used when (b)egin bit is set in MP header
  56 #define MP_END          0x40            // This value is used when (e)nd bit is set in MP header
  57 #define MP_BOTH_BITS    0xC0            // This value is used when both bits (begin and end) are set in MP header
  58
  59 #define DEFAULT_EPDIS_ADDRESS   "L2TPNetServer"         // Company name may goes here!
  60
  61 // Constants
  62 #ifndef ETCDIR
  63 #define ETCDIR          "/etc/l2tpns"
  64 #endif
  65
  66 #ifndef LIBDIR
  67 #define LIBDIR          "/usr/lib/l2tpns"
  68 #endif
  69
  70 #ifndef PLUGINDIR
  71 #define PLUGINDIR       LIBDIR          // Plugins
  72 #endif
  73
  74 #ifndef PLUGINCONF
  75 #define PLUGINCONF      ETCDIR          // Plugin config dir
  76 #endif
  77
  78 #ifndef FLASHDIR
  79 #define FLASHDIR        ETCDIR
  80 #endif
  81
  82 #define TUNDEVICE       "/dev/net/tun"
  83 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  84 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  85 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  86 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  87 #define ACCT_TIME       3000                            // 5 minute accounting interval
  88 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  89 #define L2TPPORT        1701                            // L2TP port
  90 #define RADPORT         1645                            // old radius port...
  91 #define DAEPORT         3799                            // DAE port
  92 #define PKTARP          0x0806                          // ARP packet type
  93 #define PKTIP           0x0800                          // IPv4 packet type
  94 #define PKTIPV6         0x86DD                          // IPv6 packet type
  95 #define PPPPAP          0xC023
  96 #define PPPCHAP         0xC223
  97 #define PPPLCP          0xC021
  98 #define PPPIPCP         0x8021
  99 #define PPPIPV6CP       0x8057
 100 #define PPPCCP          0x80FD
 101 #define PPPIP           0x0021
 102 #define PPPIPV6         0x0057
 103 #define PPPMP           0x003D
 104 #define MIN_IP_SIZE     0x19
 105
 106 enum {
 107         ConfigReq = 1,
 108         ConfigAck,
 109         ConfigNak,
 110         ConfigRej,
 111         TerminateReq,
 112         TerminateAck,
 113         CodeRej,
 114         ProtocolRej,
 115         EchoReq,
 116         EchoReply,
 117         DiscardRequest,
 118         IdentRequest
 119 };
 120
 121 enum {
 122         AccessRequest = 1,
 123         AccessAccept,
 124         AccessReject,
 125         AccountingRequest,
 126         AccountingResponse,
 127         AccessChallenge = 11,
 128         DisconnectRequest = 40,
 129         DisconnectACK,
 130         DisconnectNAK,
 131         CoARequest,
 132         CoAACK,
 133         CoANAK
 134 };
 135
 136 // PPP phases
 137 enum {
 138         Dead,
 139         Establish,
 140         Authenticate,
 141         Network,
 142         Terminate
 143 };
 144
 145 // PPP states
 146 enum {
 147         Initial,
 148         Starting,
 149         Closed,
 150         Stopped,
 151         Closing,
 152         Stopping,
 153         RequestSent,
 154         AckReceived,
 155         AckSent,
 156         Opened
 157 };
 158
 159 // reset state machine counters
 160 #define initialise_restart_count(_s, _fsm)                      \
 161         sess_local[_s]._fsm.conf_sent =                         \
 162         sess_local[_s]._fsm.nak_sent = 0
 163
 164 // no more attempts
 165 #define zero_restart_count(_s, _fsm) ({                         \
 166         sess_local[_s]._fsm.conf_sent =                         \
 167                 config->ppp_max_configure;                      \
 168         sess_local[_s]._fsm.restart =                           \
 169                 time_now + config->ppp_restart_time;            \
 170 })
 171
 172 // increment ConfReq counter and reset timer
 173 #define restart_timer(_s, _fsm) ({                              \
 174         sess_local[_s]._fsm.conf_sent++;                        \
 175         sess_local[_s]._fsm.restart =                           \
 176                 time_now + config->ppp_restart_time;            \
 177 })
 178
 179 // stop timer on change to state where timer does not run
 180 #define change_state(_s, _fsm, _new) ({                         \
 181         if (_new != session[_s].ppp._fsm)                       \
 182         {                                                       \
 183                 switch (_new)                                   \
 184                 {                                               \
 185                 case Initial:                                   \
 186                 case Starting:                                  \
 187                 case Closed:                                    \
 188                 case Stopped:                                   \
 189                 case Opened:                                    \
 190                         sess_local[_s]._fsm.restart = 0;        \
 191                         initialise_restart_count(_s, _fsm);     \
 192                 }                                               \
 193                 session[_s].ppp._fsm = _new;                    \
 194                 cluster_send_session(_s);                       \
 195         }                                                       \
 196 })
 197
 198 // Types
 199 typedef uint16_t sessionidt;
 200 typedef uint16_t bundleidt;
 201 typedef uint16_t tunnelidt;
 202 typedef uint32_t clockt;
 203 typedef uint8_t hasht[16];
 204
 205 // CLI actions
 206 struct cli_session_actions {
 207         char action;
 208         in_addr_t snoop_ip;
 209         uint16_t snoop_port;
 210         int throttle_in;
 211         int throttle_out;
 212         int filter_in;
 213         int filter_out;
 214 };
 215
 216 #define CLI_SESS_KILL           0x01
 217 #define CLI_SESS_SNOOP          0x02
 218 #define CLI_SESS_NOSNOOP        0x04
 219 #define CLI_SESS_THROTTLE       0x08
 220 #define CLI_SESS_NOTHROTTLE     0x10
 221 #define CLI_SESS_FILTER         0x20
 222 #define CLI_SESS_NOFILTER       0x40
 223
 224 struct cli_tunnel_actions {
 225         char action;
 226 };
 227
 228 #define CLI_TUN_KILL            0x01
 229
 230 // structures
 231 typedef struct                  // route
 232 {
 233         in_addr_t ip;
 234         in_addr_t mask;
 235 }
 236 routet;
 237
 238 typedef struct controls         // control message
 239 {
 240         struct controls *next;  // next in queue
 241         uint16_t length;        // length
 242         uint8_t buf[MAXCONTROL];
 243 }
 244 controlt;
 245
 246 typedef struct {
 247         uint8_t length;                 // Endpoint Discriminator length
 248         uint8_t addr_class;             // Endpoint Discriminator class
 249         uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
 250 } epdist;
 251
 252 typedef struct {
 253         uint16_t length;                // Fragment length
 254         uint8_t data[MAXFRAGLEN];       // Fragment data
 255 } fragmentt;
 256
 257 typedef struct
 258 {
 259         sessionidt next;                // next session in linked list
 260         sessionidt far;                 // far end session ID
 261         tunnelidt tunnel;               // near end tunnel ID
 262         uint8_t flags;                  // session flags: see SESSION_*
 263         struct {
 264                 uint8_t phase;          // PPP phase
 265                 uint8_t lcp:4;          //   LCP    state
 266                 uint8_t ipcp:4;         //   IPCP   state
 267                 uint8_t ipv6cp:4;       //   IPV6CP state
 268                 uint8_t ccp:4;          //   CCP    state
 269         } ppp;
 270         char reserved_1[2];             // unused: padding
 271         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 272         int ip_pool_index;              // index to IP pool
 273         uint32_t unique_id;             // unique session id
 274         char reserved_2[4];             // unused: was ns/nr
 275         uint32_t magic;                 // ppp magic number
 276         uint32_t pin, pout;             // packet counts
 277         uint32_t cin, cout;             // byte counts
 278         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 279         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 280         uint16_t throttle_in;           // upstream throttle rate (kbps)
 281         uint16_t throttle_out;          // downstream throttle rate
 282         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 283         uint8_t filter_out;             // output filter index
 284         uint16_t mru;                   // maximum receive unit
 285         clockt opened;                  // when started
 286         clockt die;                     // being closed, when to finally free
 287         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 288         in_addr_t dns1, dns2;           // DNS servers
 289         routet route[MAXROUTE];         // static routes
 290         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 291         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 292         int random_vector_length;
 293         uint8_t random_vector[MAXTEL];
 294         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 295         char called[MAXTEL];            // called number
 296         char calling[MAXTEL];           // calling number
 297         uint32_t tx_connect_speed;
 298         uint32_t rx_connect_speed;
 299         clockt timeout;                 // Session timeout
 300         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 301         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 302         epdist epdis;                   // Multilink Endpoint Discriminator
 303         bundleidt bundle;               // Multilink Bundle Identifier
 304         in_addr_t snoop_ip;             // Interception destination IP
 305         uint16_t snoop_port;            // Interception destination port
 306         uint8_t walled_garden;          // is this session gardened?
 307         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 308         struct in6_addr ipv6route;      // Static IPv6 route
 309         char reserved_3[11];            // Space to expand structure without changing HB_VERSION
 310 }
 311 sessiont;
 312
 313 typedef struct
 314 {
 315         int state;                              // current state (bundlestate enum)
 316         uint32_t seq_num_t;                     // Sequence Number (transmission)
 317         uint32_t seq_num_m;                     // Last received frame sequence number (bearing B bit)
 318         uint32_t offset;                        // Offset between sequence number and array index
 319         uint8_t pending_frag;                   // Indicate that there is pending fragments to reassemble
 320         uint8_t num_of_links;                   // Number of links joint to this bundle
 321         uint32_t online_time;                   // The time this bundle is online
 322         clockt last_check;                      // Last time the timeout is checked
 323         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 324         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 325         epdist epdis;                           // Multilink Endpoint Discriminator
 326         char user[MAXUSER];                     // Needed for matching member links
 327         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 328         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 329 }
 330 bundlet;
 331
 332 typedef struct
 333 {
 334         fragmentt fragment[MAXFRAGNUM];
 335         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 336         uint16_t re_frame_len;                  // The reassembled frame length
 337 }
 338 fragmentationt;
 339
 340 #define AUTHPAP         1       // allow PAP
 341 #define AUTHCHAP        2       // allow CHAP
 342
 343 typedef struct
 344 {
 345         // packet counters
 346         uint32_t pin;
 347         uint32_t pout;
 348
 349         // byte counters
 350         uint32_t cin;
 351         uint32_t cout;
 352
 353         // PPP restart timer/counters
 354         struct {
 355                 time_t restart;
 356                 int conf_sent;
 357                 int nak_sent;
 358         } lcp, ipcp, ipv6cp, ccp;
 359
 360         // identifier for Protocol-Reject, Code-Reject
 361         uint8_t lcp_ident;
 362
 363         // authentication to use
 364         int lcp_authtype;
 365
 366         // our MRU
 367         uint16_t ppp_mru;
 368
 369         // our MRRU
 370         uint16_t mp_mrru;
 371
 372         // our mssf
 373         uint16_t mp_mssf;
 374
 375         // our Endpoint Discriminator
 376         in_addr_t mp_epdis;
 377
 378         // DoS prevention
 379         clockt last_packet_out;
 380         uint32_t packets_out;
 381         uint32_t packets_dropped;
 382
 383         // RADIUS session in use
 384         uint16_t radius;
 385
 386         // interim RADIUS
 387         time_t last_interim;
 388
 389         // last LCP Echo
 390         time_t last_echo;
 391 } sessionlocalt;
 392
 393 // session flags
 394 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 395 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 396 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 397
 398 // 168 bytes per tunnel
 399 typedef struct
 400 {
 401         tunnelidt far;          // far end tunnel ID
 402         in_addr_t ip;           // Ip for far end
 403         uint16_t port;          // port for far end
 404         uint16_t window;        // Rx window
 405         uint16_t nr;            // next receive
 406         uint16_t ns;            // next send
 407         int state;              // current state (tunnelstate enum)
 408         clockt last;            // when last control message sent (used for resend timeout)
 409         clockt retry;           // when to try resending pending control
 410         clockt die;             // being closed, when to finally free
 411         clockt lastrec;         // when the last control message was received
 412         char hostname[128];     // tunnel hostname
 413         char vendor[128];       // LAC vendor
 414         uint8_t try;            // number of retrys on a control message
 415         uint16_t controlc;      // outstaind messages in queue
 416         controlt *controls;     // oldest message
 417         controlt *controle;     // newest message
 418 }
 419 tunnelt;
 420
 421 // 164 bytes per radius session
 422 typedef struct                  // outstanding RADIUS requests
 423 {
 424         sessionidt session;     // which session this applies to
 425         hasht auth;             // request authenticator
 426         clockt retry;           // when to try next
 427         char pass[129];         // password
 428         uint8_t id;             // ID for PPP response
 429         uint8_t try;            // which try we are on
 430         uint8_t state;          // state of radius requests
 431         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 432         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 433         char const *term_msg;   //   terminate reason
 434 }
 435 radiust;
 436
 437 typedef struct
 438 {
 439         in_addr_t       address;        // Host byte order..
 440         char            assigned;       // 1 if assigned, 0 if free
 441         sessionidt      session;
 442         clockt          last;           // last used
 443         char            user[129];      // user (try to have ip addresses persistent)
 444 }
 445 ippoolt;
 446
 447 #ifdef RINGBUFFER
 448 struct Tringbuffer
 449 {
 450         struct {
 451                 char level;
 452                 sessionidt session;
 453                 tunnelidt tunnel;
 454                 char message[MAX_LOG_LENGTH];
 455         } buffer[RINGBUFFER_SIZE];
 456         int head;
 457         int tail;
 458 };
 459 #endif
 460
 461 /*
 462  * Possible tunnel states
 463  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 464  */
 465 enum
 466 {
 467         TUNNELFREE,             // Not in use
 468         TUNNELOPEN,             // Active tunnel
 469         TUNNELDIE,              // Currently closing
 470         TUNNELOPENING,          // Busy opening
 471         TUNNELUNDEF,            // Undefined
 472 };
 473
 474 enum
 475 {
 476         BUNDLEFREE,             // Not in use
 477         BUNDLEOPEN,             // Active bundle
 478         BUNDLEUNDEF,            // Undefined
 479 };
 480
 481 enum
 482 {
 483         NULLCLASS = 0,          //End Point Discriminator classes
 484         LOCALADDR,
 485         IPADDR,
 486         IEEEMACADDR,
 487         PPPMAGIC,
 488         PSNDN,
 489 };
 490
 491 enum
 492 {
 493         RADIUSNULL,             // Not in use
 494         RADIUSCHAP,             // sending CHAP down PPP
 495         RADIUSAUTH,             // sending auth to RADIUS server
 496         RADIUSSTART,            // sending start accounting to RADIUS server
 497         RADIUSSTOP,             // sending stop accounting to RADIUS server
 498         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 499         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 500 };
 501
 502 struct Tstats
 503 {
 504     time_t      start_time;
 505     time_t      last_reset;
 506
 507     uint32_t    tun_rx_packets;
 508     uint32_t    tun_tx_packets;
 509     uint32_t    tun_rx_bytes;
 510     uint32_t    tun_tx_bytes;
 511     uint32_t    tun_rx_errors;
 512     uint32_t    tun_tx_errors;
 513     uint32_t    tun_rx_dropped;
 514
 515     uint32_t    tunnel_rx_packets;
 516     uint32_t    tunnel_tx_packets;
 517     uint32_t    tunnel_rx_bytes;
 518     uint32_t    tunnel_tx_bytes;
 519     uint32_t    tunnel_rx_errors;
 520     uint32_t    tunnel_tx_errors;
 521
 522     uint32_t    tunnel_retries;
 523     uint32_t    radius_retries;
 524
 525     uint32_t    arp_sent;
 526
 527     uint32_t    packets_snooped;
 528
 529     uint32_t    tunnel_created;
 530     uint32_t    session_created;
 531     uint32_t    tunnel_timeout;
 532     uint32_t    session_timeout;
 533     uint32_t    radius_timeout;
 534     uint32_t    radius_overflow;
 535     uint32_t    tunnel_overflow;
 536     uint32_t    session_overflow;
 537
 538     uint32_t    ip_allocated;
 539     uint32_t    ip_freed;
 540
 541     uint32_t    c_forwarded;
 542     uint32_t    recv_forward;
 543
 544     uint32_t    select_called;
 545     uint32_t    multi_read_used;
 546     uint32_t    multi_read_exceeded;
 547
 548 #ifdef STATISTICS
 549     uint32_t    call_processtun;
 550     uint32_t    call_processipout;
 551     uint32_t    call_processipv6out;
 552     uint32_t    call_processudp;
 553     uint32_t    call_sessionbyip;
 554     uint32_t    call_sessionbyipv6;
 555     uint32_t    call_sessionbyuser;
 556     uint32_t    call_sendarp;
 557     uint32_t    call_sendipcp;
 558     uint32_t    call_sendipv6cp;
 559     uint32_t    call_processipv6cp;
 560     uint32_t    call_tunnelsend;
 561     uint32_t    call_sessionkill;
 562     uint32_t    call_sessionshutdown;
 563     uint32_t    call_tunnelkill;
 564     uint32_t    call_tunnelshutdown;
 565     uint32_t    call_assign_ip_address;
 566     uint32_t    call_free_ip_address;
 567     uint32_t    call_dump_acct_info;
 568     uint32_t    call_sessionsetup;
 569     uint32_t    call_processpap;
 570     uint32_t    call_processchap;
 571     uint32_t    call_processlcp;
 572     uint32_t    call_processipcp;
 573     uint32_t    call_processipin;
 574     uint32_t    call_processipv6in;
 575     uint32_t    call_processccp;
 576     uint32_t    call_sendchap;
 577     uint32_t    call_processrad;
 578     uint32_t    call_radiussend;
 579     uint32_t    call_radiusretry;
 580     uint32_t    call_random_data;
 581 #endif
 582 };
 583
 584 #ifdef STATISTICS
 585
 586 #ifdef STAT_CALLS
 587 #define CSTAT(x)        STAT(call_ ## x)
 588 #else
 589 #define CSTAT(x)
 590 #endif
 591
 592 #define STAT(x)         (_statistics->x++)
 593 #define INC_STAT(x,y)   (_statistics->x += (y))
 594 #define GET_STAT(x)     (_statistics->x)
 595 #define SET_STAT(x, y)  (_statistics->x = (y))
 596 #else
 597 #define CSTAT(x)
 598 #define STAT(x)
 599 #define INC_STAT(x,y)
 600 #define GET_STAT(x)     0
 601 #define SET_STAT(x, y)
 602 #endif
 603
 604 typedef struct
 605 {
 606         int             debug;                          // debugging level
 607         time_t          start_time;                     // time when l2tpns was started
 608         char            bandwidth[256];                 // current bandwidth
 609         char            pid_file[256];                  // file to write PID to on startup
 610         int             wrote_pid;
 611         clockt          current_time;                   // 1/10ths of a second since the process started.
 612                                                         // means that we can only run a given process
 613                                                         // for 13 years without re-starting!
 614
 615         char            config_file[128];
 616         int             reload_config;                  // flag to re-read config (set by cli)
 617         int             multi_read_count;               // amount of packets to read per fd in processing loop
 618
 619         char            tundevice[10];                  // tun device name
 620         char            log_filename[128];
 621
 622         char            l2tp_secret[64];                // L2TP shared secret
 623         int             l2tp_mtu;                       // MTU of interface used for L2TP
 624
 625         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 626
 627         int             ppp_restart_time;               // timeout for PPP restart
 628         int             ppp_max_configure;              // max lcp configure requests to send
 629         int             ppp_max_failure;                // max lcp configure naks to send
 630
 631         char            radiussecret[64];
 632         int             radius_accounting;
 633         int             radius_interim;
 634         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 635         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 636         uint8_t         numradiusservers;               // radius server count
 637
 638         uint16_t        radius_dae_port;                // local port for radius dae
 639
 640         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 641         int             radius_authtypes;
 642         int             radius_authprefer;
 643
 644         int             allow_duplicate_users;          // allow multiple logins with the same username
 645         char            guest_user[MAXUSER];            // allow multiple logins to guest account username
 646
 647         in_addr_t       default_dns1, default_dns2;
 648
 649         unsigned long   rl_rate;                        // default throttle rate
 650         int             num_tbfs;                       // number of throttle buckets
 651
 652         char            accounting_dir[128];
 653         in_addr_t       bind_address;
 654         in_addr_t       peer_address;
 655         int             send_garp;                      // Set to true to garp for vip address on startup
 656
 657         int             target_uid;
 658         int             dump_speed;
 659         char            plugins[64][MAXPLUGINS];
 660         char            old_plugins[64][MAXPLUGINS];
 661
 662         int             next_tbf;                       // Next HTB id available to use
 663         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 664                                                         // policy for this process.
 665         int             lock_pages;                     // Lock pages into memory.
 666         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 667         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 668         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 669
 670         in_addr_t       cluster_address;                // Multicast address of cluster.
 671                                                         // Send to this address to have everyone hear.
 672         char            cluster_interface[64];          // Which interface to listen for multicast on.
 673         int             cluster_iam_master;             // Are we the cluster master???
 674         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 675         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 676                                                         // Zero if i am the cluster master.
 677         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 678                                                         // (or the seq number we're next expecting if we're a slave).
 679         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 680         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 681         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 682         int             cluster_highest_sessionid;
 683         int             cluster_highest_bundleid;
 684         int             cluster_highest_tunnelid;
 685         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 686         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 687         int             cluster_num_changes;            // Number of changes queued.
 688
 689         int             cluster_mcast_ttl;              // TTL for multicast packets
 690         int             cluster_hb_interval;            // How often to send a heartbeat.
 691         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 692         uint64_t        cluster_table_version;          // # state changes processed by cluster
 693         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 694                                                         // slaves is less than this value.
 695
 696         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 697
 698 #ifdef BGP
 699 #define BGP_NUM_PEERS   2
 700         uint16_t as_number;
 701         struct {
 702                 char name[64];
 703                 uint16_t as;
 704                 int keepalive;
 705                 int hold;
 706         } neighbour[BGP_NUM_PEERS];
 707 #endif
 708 } configt;
 709
 710 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 711 typedef struct
 712 {
 713         char *key;
 714         int offset;
 715         int size;
 716         enum config_typet type;
 717 } config_descriptt;
 718
 719 typedef struct
 720 {
 721         uint8_t op;     // operation
 722 #define FILTER_PORT_OP_NONE     0 // all ports match
 723 #define FILTER_PORT_OP_EQ       1
 724 #define FILTER_PORT_OP_NEQ      2
 725 #define FILTER_PORT_OP_GT       3
 726 #define FILTER_PORT_OP_LT       4
 727 #define FILTER_PORT_OP_RANGE    5
 728         uint16_t port;  // port (host byte order)
 729         uint16_t port2; // range
 730 } ip_filter_portt;
 731
 732 typedef struct
 733 {
 734         int action;             // permit/deny
 735 #define FILTER_ACTION_DENY      1
 736 #define FILTER_ACTION_PERMIT    2
 737         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 738         in_addr_t src_ip;       // source ip (network byte order)
 739         in_addr_t src_wild;
 740         ip_filter_portt src_ports;
 741         in_addr_t dst_ip;       // dest ip
 742         in_addr_t dst_wild;
 743         ip_filter_portt dst_ports;
 744         uint8_t frag;           // apply to non-initial fragments
 745         uint8_t tcp_flag_op;    // match type: any, all, established
 746 #define FILTER_FLAG_OP_ANY      1
 747 #define FILTER_FLAG_OP_ALL      2
 748 #define FILTER_FLAG_OP_EST      3
 749         uint8_t tcp_sflags;     // flags set
 750         uint8_t tcp_cflags;     // flags clear
 751         uint32_t counter;       // match count
 752 } ip_filter_rulet;
 753
 754 #define TCP_FLAG_FIN    0x01
 755 #define TCP_FLAG_SYN    0x02
 756 #define TCP_FLAG_RST    0x04
 757 #define TCP_FLAG_PSH    0x08
 758 #define TCP_FLAG_ACK    0x10
 759 #define TCP_FLAG_URG    0x20
 760
 761 #define MAXFILTER               32
 762 #define MAXFILTER_RULES         32
 763 typedef struct
 764 {
 765         char name[32];          // ACL name
 766         int extended;           // type: 0 = standard, 1 = extended
 767         ip_filter_rulet rules[MAXFILTER_RULES];
 768         int used;               // session ref count
 769 } ip_filtert;
 770
 771 // CDN result/error codes
 772 #define CDN_NONE                        0, 0
 773 #define CDN_TRY_ANOTHER                 2, 7
 774 #define CDN_ADMIN_DISC                  3, 0
 775 #define CDN_UNAVAILABLE                 4, 0
 776
 777 // RADIUS Acct-Terminate-Cause values
 778 #define TERM_USER_REQUEST               1
 779 #define TERM_LOST_CARRIER               2
 780 #define TERM_LOST_SERVICE               3
 781 #define TERM_IDLE_TIMEOUT               4
 782 #define TERM_SESSION_TIMEOUT            5
 783 #define TERM_ADMIN_RESET                6
 784 #define TERM_ADMIN_REBOOT               7
 785 #define TERM_PORT_ERROR                 8
 786 #define TERM_NAS_ERROR                  9
 787 #define TERM_NAS_REQUEST                10
 788 #define TERM_NAS_REBOOT                 11
 789 #define TERM_PORT_UNNEEDED              12
 790 #define TERM_PORT_PREEMPTED             13
 791 #define TERM_PORT_SUSPENDED             14
 792 #define TERM_SERVICE_UNAVAILABLE        15
 793 #define TERM_CALLBACK                   16
 794 #define TERM_USER_ERROR                 17
 795 #define TERM_HOST_REQUEST               18
 796 #define TERM_SUPPLICANT_RESTART         19
 797 #define TERM_REAUTHENTICATION_FAILURE   20
 798 #define TERM_PORT_REINIT                21
 799 #define TERM_PORT_DISABLED              22
 800
 801 // arp.c
 802 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 803
 804
 805 // ppp.c
 806 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 807 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 808 void lcp_open(sessionidt s, tunnelidt t);
 809 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 810 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 811 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 812 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 813 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 814 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 815 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 816 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 817 void sendchap(sessionidt s, tunnelidt t);
 818 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
 819 void sendlcp(sessionidt s, tunnelidt t);
 820 void send_ipin(sessionidt s, uint8_t *buf, int len);
 821 void sendccp(sessionidt s, tunnelidt t);
 822 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 823 int join_bundle(sessionidt s);
 824
 825
 826 // radius.c
 827 void initrad(void);
 828 void radiussend(uint16_t r, uint8_t state);
 829 void processrad(uint8_t *buf, int len, char socket_index);
 830 void radiusretry(uint16_t r);
 831 uint16_t radiusnew(sessionidt s);
 832 void radiusclear(uint16_t r, sessionidt s);
 833 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 834
 835
 836 // l2tpns.c
 837 clockt backoff(uint8_t try);
 838 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 839 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 840 sessionidt sessionbyip(in_addr_t ip);
 841 sessionidt sessionbyipv6(struct in6_addr ip);
 842 sessionidt sessionbyuser(char *username);
 843 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 844 void random_data(uint8_t *buf, int len);
 845 void sessionkill(sessionidt s, char *reason);
 846 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 847 void filter_session(sessionidt s, int filter_in, int filter_out);
 848 void send_garp(in_addr_t ip);
 849 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 850 int tun_write(uint8_t *data, int size);
 851 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 852 void sendipcp(sessionidt s, tunnelidt t);
 853 void sendipv6cp(sessionidt s, tunnelidt t);
 854 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 855 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 856 int find_filter(char const *name, size_t len);
 857 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 858 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 859 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 860 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 861
 862 #undef LOG
 863 #undef LOG_HEX
 864 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 865 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 866
 867 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 868 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 869
 870
 871 int sessionsetup(sessionidt s, tunnelidt t);
 872 int run_plugins(int plugin_type, void *data);
 873 void rebuild_address_pool(void);
 874 void throttle_session(sessionidt s, int rate_in, int rate_out);
 875 int load_session(sessionidt, sessiont *);
 876 void become_master(void);       // We're the master; kick off any required master initializations.
 877
 878
 879 // cli.c
 880 void init_cli(char *hostname);
 881 void cli_do_file(FILE *fh);
 882 void cli_do(int sockfd);
 883 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 884
 885
 886 // icmp.c
 887 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 888
 889
 890 extern tunnelt *tunnel;
 891 extern bundlet *bundle;
 892 extern sessiont *session;
 893 extern sessionlocalt *sess_local;
 894 extern ippoolt *ip_address_pool;
 895 #define sessionfree (session[0].next)
 896
 897
 898 extern configt *config;
 899 extern time_t basetime;         // Time when this process started.
 900 extern time_t time_now;         // Seconds since EPOCH.
 901 extern char main_quit;
 902 extern uint32_t last_id;
 903 extern struct Tstats *_statistics;
 904 extern in_addr_t my_address;
 905 extern int clifd;
 906 extern int epollfd;
 907
 908 struct event_data {
 909         enum {
 910                 FD_TYPE_CLI,
 911                 FD_TYPE_CLUSTER,
 912                 FD_TYPE_TUN,
 913                 FD_TYPE_UDP,
 914                 FD_TYPE_CONTROL,
 915                 FD_TYPE_DAE,
 916                 FD_TYPE_RADIUS,
 917                 FD_TYPE_BGP,
 918         } type;
 919         int index; // for RADIUS, BGP
 920 };
 921
 922 #define TIME (config->current_time)
 923
 924 extern uint16_t MRU;
 925 extern uint16_t MSS;
 926
 927 // macros for handling help in cli commands
 928 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 929 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 930
 931 // CVS identifiers (for "show version file")
 932 extern char const *cvs_id_arp;
 933 extern char const *cvs_id_cli;
 934 extern char const *cvs_id_cluster;
 935 extern char const *cvs_id_constants;
 936 extern char const *cvs_id_control;
 937 extern char const *cvs_id_icmp;
 938 extern char const *cvs_id_l2tpns;
 939 extern char const *cvs_id_ll;
 940 extern char const *cvs_id_md5;
 941 extern char const *cvs_id_ppp;
 942 extern char const *cvs_id_radius;
 943 extern char const *cvs_id_tbf;
 944 extern char const *cvs_id_util;
 945
 946 #endif /* __L2TPNS_H__ */