l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.121 2009-12-08 14:49:28 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 "2.2.1"
  18
  19 // Limits
  20 #define MAXTUNNEL       500             // could be up to 65535
  21 #define MAXBUNDLE       300             // could be up to 65535
  22 #define MAXBUNDLESES    12              // Maximum number of member links in bundle
  23 #define MAXADDRESS      20              // Maximum length for the Endpoint Discrminiator address
  24 #define MAXSESSION      60000           // could be up to 65535
  25 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  26
  27 #define RADIUS_SHIFT    6
  28 #define RADIUS_FDS      (1 << RADIUS_SHIFT)
  29 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  30 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  31
  32 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  33 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  34
  35 #define MAXCONTROL      1000            // max length control message we ever send...
  36 #define MINMTU          576             // minimum recommended MTU (rfc1063)
  37 #define MAXMTU          2600            // arbitrary maximum MTU
  38 #define PPPoE_MRU       1492            // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
  39 #define MAXETHER        (MAXMTU+18)     // max packet we try sending to tun
  40 #define MAXTEL          96              // telephone number
  41 #define MAXHOSTNAME     256             // hostname
  42 #define MAXUSER         128             // username
  43 #define MAXPASS         128             // password
  44 #define MAXCLASS        128             // radius class attribute size
  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 seen and session shutdown
  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 MINFRAGLEN      64              // Minumum fragment length
  60 #define MAXFRAGLEN      1496    // Maximum length for Multilink fragment (The multilink may contain only one link)
  61 #define MAXFRAGNUM      512             // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
  62                                         // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
  63 #define MAXFRAGNUM_MASK 511             // Must be equal to MAXFRAGNUM-1
  64
  65 // Constants
  66 #ifndef ETCDIR
  67 #define ETCDIR          "/etc/l2tpns"
  68 #endif
  69
  70 #ifndef LIBDIR
  71 #define LIBDIR          "/usr/lib/l2tpns"
  72 #endif
  73
  74 #ifndef PLUGINDIR
  75 #define PLUGINDIR       LIBDIR          // Plugins
  76 #endif
  77
  78 #ifndef PLUGINCONF
  79 #define PLUGINCONF      ETCDIR          // Plugin config dir
  80 #endif
  81
  82 #ifndef FLASHDIR
  83 #define FLASHDIR        ETCDIR
  84 #endif
  85
  86 #define TUNDEVICE       "/dev/net/tun"
  87 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  88 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  89 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  90 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  91 #define ACCT_TIME       3000                            // 5 minute accounting interval
  92 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  93 #define L2TPPORT        1701                            // L2TP port
  94 #define RADPORT         1645                            // old radius port...
  95 #define DAEPORT         3799                            // DAE port
  96 #define PKTARP          0x0806                          // ARP packet type
  97 #define PKTIP           0x0800                          // IPv4 packet type
  98 #define PKTIPV6         0x86DD                          // IPv6 packet type
  99 #define PPPPAP          0xC023
 100 #define PPPCHAP         0xC223
 101 #define PPPLCP          0xC021
 102 #define PPPIPCP         0x8021
 103 #define PPPIPV6CP       0x8057
 104 #define PPPCCP          0x80FD
 105 #define PPPIP           0x0021
 106 #define PPPIPV6         0x0057
 107 #define PPPMP           0x003D
 108 #define MIN_IP_SIZE     0x19
 109
 110 enum {
 111         ConfigReq = 1,
 112         ConfigAck,
 113         ConfigNak,
 114         ConfigRej,
 115         TerminateReq,
 116         TerminateAck,
 117         CodeRej,
 118         ProtocolRej,
 119         EchoReq,
 120         EchoReply,
 121         DiscardRequest,
 122         IdentRequest
 123 };
 124
 125 enum {
 126         AccessRequest = 1,
 127         AccessAccept,
 128         AccessReject,
 129         AccountingRequest,
 130         AccountingResponse,
 131         AccessChallenge = 11,
 132         DisconnectRequest = 40,
 133         DisconnectACK,
 134         DisconnectNAK,
 135         CoARequest,
 136         CoAACK,
 137         CoANAK
 138 };
 139
 140 // PPP phases
 141 enum {
 142         Dead,
 143         Establish,
 144         Authenticate,
 145         Network,
 146         Terminate
 147 };
 148
 149 // PPP states
 150 enum {
 151         Initial,
 152         Starting,
 153         Closed,
 154         Stopped,
 155         Closing,
 156         Stopping,
 157         RequestSent,
 158         AckReceived,
 159         AckSent,
 160         Opened
 161 };
 162
 163 // reset state machine counters
 164 #define initialise_restart_count(_s, _fsm)                      \
 165         sess_local[_s]._fsm.conf_sent =                         \
 166         sess_local[_s]._fsm.nak_sent = 0
 167
 168 // no more attempts
 169 #define zero_restart_count(_s, _fsm) ({                         \
 170         sess_local[_s]._fsm.conf_sent =                         \
 171                 config->ppp_max_configure;                      \
 172         sess_local[_s]._fsm.restart =                           \
 173                 time_now + config->ppp_restart_time;            \
 174 })
 175
 176 // increment ConfReq counter and reset timer
 177 #define restart_timer(_s, _fsm) ({                              \
 178         sess_local[_s]._fsm.conf_sent++;                        \
 179         sess_local[_s]._fsm.restart =                           \
 180                 time_now + config->ppp_restart_time;            \
 181 })
 182
 183 // stop timer on change to state where timer does not run
 184 #define change_state(_s, _fsm, _new) ({                         \
 185         if (_new != session[_s].ppp._fsm)                       \
 186         {                                                       \
 187                 switch (_new)                                   \
 188                 {                                               \
 189                 case Initial:                                   \
 190                 case Starting:                                  \
 191                 case Closed:                                    \
 192                 case Stopped:                                   \
 193                 case Opened:                                    \
 194                         sess_local[_s]._fsm.restart = 0;        \
 195                         initialise_restart_count(_s, _fsm);     \
 196                 }                                               \
 197                 session[_s].ppp._fsm = _new;                    \
 198                 cluster_send_session(_s);                       \
 199         }                                                       \
 200 })
 201
 202 // Types
 203 typedef uint16_t sessionidt;
 204 typedef uint16_t bundleidt;
 205 typedef uint16_t tunnelidt;
 206 typedef uint32_t clockt;
 207 typedef uint8_t hasht[16];
 208
 209 // CLI actions
 210 struct cli_session_actions {
 211         char action;
 212         in_addr_t snoop_ip;
 213         uint16_t snoop_port;
 214         int throttle_in;
 215         int throttle_out;
 216         int filter_in;
 217         int filter_out;
 218 };
 219
 220 #define CLI_SESS_KILL           0x01
 221 #define CLI_SESS_SNOOP          0x02
 222 #define CLI_SESS_NOSNOOP        0x04
 223 #define CLI_SESS_THROTTLE       0x08
 224 #define CLI_SESS_NOTHROTTLE     0x10
 225 #define CLI_SESS_FILTER         0x20
 226 #define CLI_SESS_NOFILTER       0x40
 227
 228 struct cli_tunnel_actions {
 229         char action;
 230 };
 231
 232 #define CLI_TUN_KILL            0x01
 233
 234 // structures
 235 typedef struct                  // route
 236 {
 237         in_addr_t ip;
 238         int prefixlen;
 239 }
 240 routet;
 241
 242 typedef struct controls         // control message
 243 {
 244         struct controls *next;  // next in queue
 245         uint16_t length;        // length
 246         union {
 247                 uint8_t buf[MAXCONTROL];
 248                 uint16_t buf16[MAXCONTROL/2];
 249         } __attribute__ ((__transparent_union__));
 250 }
 251 controlt;
 252
 253 typedef struct {
 254         uint8_t length;                 // Endpoint Discriminator length
 255         uint8_t addr_class;             // Endpoint Discriminator class
 256         uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
 257 } epdist;
 258
 259 typedef struct {
 260         sessionidt sid;                 // Fragment originating session
 261         tunnelidt tid;                  // Fragment originating tunnel
 262         uint8_t flags;                  // MP frame flags
 263         uint32_t seq;                   // fragment seq num
 264         uint16_t length;                // Fragment length
 265         uint8_t data[MAXFRAGLEN];       // Fragment data
 266 } fragmentt;
 267
 268 typedef struct
 269 {
 270         sessionidt next;                // next session in linked list
 271         sessionidt far;                 // far end session ID
 272         tunnelidt tunnel;               // near end tunnel ID
 273         uint8_t flags;                  // session flags: see SESSION_*
 274         struct {
 275                 uint8_t phase;          // PPP phase
 276                 uint8_t lcp:4;          //   LCP    state
 277                 uint8_t ipcp:4;         //   IPCP   state
 278                 uint8_t ipv6cp:4;       //   IPV6CP state
 279                 uint8_t ccp:4;          //   CCP    state
 280         } ppp;
 281         uint16_t mru;                   // maximum receive unit
 282         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 283         int ip_pool_index;              // index to IP pool
 284         uint32_t unique_id;             // unique session id
 285         uint32_t magic;                 // ppp magic number
 286         uint32_t pin, pout;             // packet counts
 287         uint32_t cin, cout;             // byte counts
 288         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 289         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 290         uint16_t throttle_in;           // upstream throttle rate (kbps)
 291         uint16_t throttle_out;          // downstream throttle rate
 292         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 293         uint8_t filter_out;             // output filter index
 294         uint16_t snoop_port;            // Interception destination port
 295         in_addr_t snoop_ip;             // Interception destination IP
 296         clockt opened;                  // when started
 297         clockt die;                     // being closed, when to finally free
 298         uint32_t session_timeout;       // Maximum session time in seconds
 299         uint32_t idle_timeout;          // Maximum idle time in seconds
 300         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 301         time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
 302         in_addr_t dns1, dns2;           // DNS servers
 303         routet route[MAXROUTE];         // static routes
 304         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 305         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 306         int random_vector_length;
 307         uint8_t random_vector[MAXTEL];
 308         char user[MAXUSER];             // user (needed in session for radius stop messages)
 309         char called[MAXTEL];            // called number
 310         char calling[MAXTEL];           // calling number
 311         uint32_t tx_connect_speed;
 312         uint32_t rx_connect_speed;
 313         clockt timeout;                 // Session timeout
 314         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 315         epdist epdis;                   // Multilink Endpoint Discriminator
 316         bundleidt bundle;               // Multilink Bundle Identifier
 317         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 318         uint8_t walled_garden;          // is this session gardened?
 319         uint8_t classlen;               // class (needed for radius accounting messages)
 320         char class[MAXCLASS];
 321         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 322         struct in6_addr ipv6route;      // Static IPv6 route
 323         char reserved[12];              // Space to expand structure without changing HB_VERSION
 324 }
 325 sessiont;
 326
 327 typedef struct
 328 {
 329         int state;                              // current state (bundlestate enum)
 330         uint32_t seq_num_t;                     // Sequence Number (transmission)
 331         uint32_t timeout;                       // Session-Timeout for bundle
 332         uint32_t max_seq;                       // Max value of sequence number field
 333         uint8_t num_of_links;                   // Number of links joint to this bundle
 334         uint32_t online_time;                   // The time this bundle is online
 335         clockt last_check;                      // Last time the timeout is checked
 336         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 337         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 338         epdist epdis;                           // Multilink Endpoint Discriminator
 339         char user[MAXUSER];                     // Needed for matching member links
 340         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 341         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 342 }
 343 bundlet;
 344
 345 typedef struct
 346 {
 347         fragmentt fragment[MAXFRAGNUM];
 348         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 349         uint16_t re_frame_len;                  // The reassembled frame length
 350         uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
 351         uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
 352         uint32_t M;                             // Minumum frame sequence number received over all bundle members
 353         uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
 354 }
 355 fragmentationt;
 356
 357 #define AUTHPAP         1       // allow PAP
 358 #define AUTHCHAP        2       // allow CHAP
 359
 360 typedef struct
 361 {
 362         // packet counters
 363         uint32_t pin;
 364         uint32_t pout;
 365
 366         // byte counters
 367         uint32_t cin;
 368         uint32_t cout;
 369
 370         // PPP restart timer/counters
 371         struct {
 372                 time_t restart;
 373                 int conf_sent;
 374                 int nak_sent;
 375         } lcp, ipcp, ipv6cp, ccp;
 376
 377         // identifier for Protocol-Reject, Code-Reject
 378         uint8_t lcp_ident;
 379
 380         // authentication to use
 381         int lcp_authtype;
 382
 383         // our MRU
 384         uint16_t ppp_mru;
 385
 386         // our MRRU
 387         uint16_t mp_mrru;
 388
 389         // our mssf
 390         uint16_t mp_mssf;
 391
 392         // our Endpoint Discriminator
 393         in_addr_t mp_epdis;
 394
 395         // DoS prevention
 396         clockt last_packet_out;
 397         uint32_t packets_out;
 398         uint32_t packets_dropped;
 399
 400         // RADIUS session in use
 401         uint16_t radius;
 402
 403         // interim RADIUS
 404         time_t last_interim;
 405
 406         // last LCP Echo
 407         time_t last_echo;
 408
 409         // Last Multilink frame sequence number received
 410         uint32_t last_seq;
 411 } sessionlocalt;
 412
 413 // session flags
 414 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 415 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 416 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 417
 418 // 168 bytes per tunnel
 419 typedef struct
 420 {
 421         tunnelidt far;          // far end tunnel ID
 422         in_addr_t ip;           // Ip for far end
 423         uint16_t port;          // port for far end
 424         uint16_t window;        // Rx window
 425         uint16_t nr;            // next receive
 426         uint16_t ns;            // next send
 427         int state;              // current state (tunnelstate enum)
 428         clockt last;            // when last control message sent (used for resend timeout)
 429         clockt retry;           // when to try resending pending control
 430         clockt die;             // being closed, when to finally free
 431         clockt lastrec;         // when the last control message was received
 432         char hostname[128];     // tunnel hostname
 433         char vendor[128];       // LAC vendor
 434         uint8_t try;            // number of retrys on a control message
 435         uint16_t controlc;      // outstaind messages in queue
 436         controlt *controls;     // oldest message
 437         controlt *controle;     // newest message
 438 }
 439 tunnelt;
 440
 441 // 164 bytes per radius session
 442 typedef struct                  // outstanding RADIUS requests
 443 {
 444         sessionidt session;     // which session this applies to
 445         hasht auth;             // request authenticator
 446         clockt retry;           // when to try next
 447         char pass[129];         // password
 448         uint8_t id;             // ID for PPP response
 449         uint8_t try;            // which try we are on
 450         uint8_t state;          // state of radius requests
 451         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 452         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 453         char const *term_msg;   //   terminate reason
 454 }
 455 radiust;
 456
 457 typedef struct
 458 {
 459         in_addr_t       address;        // Host byte order..
 460         char            assigned;       // 1 if assigned, 0 if free
 461         sessionidt      session;
 462         clockt          last;           // last used
 463         char            user[129];      // user (try to have ip addresses persistent)
 464 }
 465 ippoolt;
 466
 467 #ifdef RINGBUFFER
 468 struct Tringbuffer
 469 {
 470         struct {
 471                 char level;
 472                 sessionidt session;
 473                 tunnelidt tunnel;
 474                 char message[MAX_LOG_LENGTH];
 475         } buffer[RINGBUFFER_SIZE];
 476         int head;
 477         int tail;
 478 };
 479 #endif
 480
 481 /*
 482  * Possible tunnel states
 483  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 484  */
 485 enum
 486 {
 487         TUNNELFREE,             // Not in use
 488         TUNNELOPEN,             // Active tunnel
 489         TUNNELDIE,              // Currently closing
 490         TUNNELOPENING,          // Busy opening
 491         TUNNELUNDEF,            // Undefined
 492 };
 493
 494 enum
 495 {
 496         BUNDLEFREE,             // Not in use
 497         BUNDLEOPEN,             // Active bundle
 498         BUNDLEUNDEF,            // Undefined
 499 };
 500
 501 enum
 502 {
 503         NULLCLASS = 0,          //End Point Discriminator classes
 504         LOCALADDR,
 505         IPADDR,
 506         IEEEMACADDR,
 507         PPPMAGIC,
 508         PSNDN,
 509 };
 510
 511 enum
 512 {
 513         RADIUSNULL,             // Not in use
 514         RADIUSCHAP,             // sending CHAP down PPP
 515         RADIUSAUTH,             // sending auth to RADIUS server
 516         RADIUSSTART,            // sending start accounting to RADIUS server
 517         RADIUSSTOP,             // sending stop accounting to RADIUS server
 518         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 519         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 520         RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning
 521 };
 522
 523 struct Tstats
 524 {
 525     time_t      start_time;
 526     time_t      last_reset;
 527
 528     uint32_t    tun_rx_packets;
 529     uint32_t    tun_tx_packets;
 530     uint32_t    tun_rx_bytes;
 531     uint32_t    tun_tx_bytes;
 532     uint32_t    tun_rx_errors;
 533     uint32_t    tun_tx_errors;
 534     uint32_t    tun_rx_dropped;
 535
 536     uint32_t    tunnel_rx_packets;
 537     uint32_t    tunnel_tx_packets;
 538     uint32_t    tunnel_rx_bytes;
 539     uint32_t    tunnel_tx_bytes;
 540     uint32_t    tunnel_rx_errors;
 541     uint32_t    tunnel_tx_errors;
 542
 543     uint32_t    tunnel_retries;
 544     uint32_t    radius_retries;
 545
 546     uint32_t    arp_sent;
 547
 548     uint32_t    packets_snooped;
 549
 550     uint32_t    tunnel_created;
 551     uint32_t    session_created;
 552     uint32_t    tunnel_timeout;
 553     uint32_t    session_timeout;
 554     uint32_t    radius_timeout;
 555     uint32_t    radius_overflow;
 556     uint32_t    tunnel_overflow;
 557     uint32_t    session_overflow;
 558
 559     uint32_t    ip_allocated;
 560     uint32_t    ip_freed;
 561
 562     uint32_t    c_forwarded;
 563     uint32_t    recv_forward;
 564
 565     uint32_t    select_called;
 566     uint32_t    multi_read_used;
 567     uint32_t    multi_read_exceeded;
 568
 569 #ifdef STATISTICS
 570     uint32_t    call_processtun;
 571     uint32_t    call_processipout;
 572     uint32_t    call_processipv6out;
 573     uint32_t    call_processudp;
 574     uint32_t    call_sessionbyip;
 575     uint32_t    call_sessionbyipv6;
 576     uint32_t    call_sessionbyuser;
 577     uint32_t    call_sendarp;
 578     uint32_t    call_sendipcp;
 579     uint32_t    call_sendipv6cp;
 580     uint32_t    call_processipv6cp;
 581     uint32_t    call_tunnelsend;
 582     uint32_t    call_sessionkill;
 583     uint32_t    call_sessionshutdown;
 584     uint32_t    call_tunnelkill;
 585     uint32_t    call_tunnelshutdown;
 586     uint32_t    call_assign_ip_address;
 587     uint32_t    call_free_ip_address;
 588     uint32_t    call_dump_acct_info;
 589     uint32_t    call_sessionsetup;
 590     uint32_t    call_processpap;
 591     uint32_t    call_processchap;
 592     uint32_t    call_processlcp;
 593     uint32_t    call_processipcp;
 594     uint32_t    call_processipin;
 595     uint32_t    call_processipv6in;
 596     uint32_t    call_processccp;
 597     uint32_t    call_sendchap;
 598     uint32_t    call_processrad;
 599     uint32_t    call_radiussend;
 600     uint32_t    call_radiusretry;
 601     uint32_t    call_random_data;
 602 #endif
 603 };
 604
 605 #ifdef STATISTICS
 606
 607 #ifdef STAT_CALLS
 608 #define CSTAT(x)        STAT(call_ ## x)
 609 #else
 610 #define CSTAT(x)
 611 #endif
 612
 613 #define STAT(x)         (_statistics->x++)
 614 #define INC_STAT(x,y)   (_statistics->x += (y))
 615 #define GET_STAT(x)     (_statistics->x)
 616 #define SET_STAT(x, y)  (_statistics->x = (y))
 617 #else
 618 #define CSTAT(x)
 619 #define STAT(x)
 620 #define INC_STAT(x,y)
 621 #define GET_STAT(x)     0
 622 #define SET_STAT(x, y)
 623 #endif
 624
 625 #ifndef IFNAMSIZ
 626 # define IFNAMSIZ 16
 627 #endif
 628
 629 typedef struct
 630 {
 631         int             debug;                          // debugging level
 632         time_t          start_time;                     // time when l2tpns was started
 633         char            bandwidth[256];                 // current bandwidth
 634         char            pid_file[256];                  // file to write PID to on startup
 635         int             wrote_pid;
 636         clockt          current_time;                   // 1/10ths of a second since the process started.
 637                                                         // means that we can only run a given process
 638                                                         // for 13 years without re-starting!
 639
 640         char            config_file[128];
 641         int             reload_config;                  // flag to re-read config (set by cli)
 642         int             multi_read_count;               // amount of packets to read per fd in processing loop
 643
 644         char            tundevice[IFNAMSIZ];            // tun device name
 645         char            log_filename[128];
 646
 647         char            l2tp_secret[64];                // L2TP shared secret
 648         int             l2tp_mtu;                       // MTU of interface used for L2TP
 649
 650         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 651
 652         int             ppp_restart_time;               // timeout for PPP restart
 653         int             ppp_max_configure;              // max lcp configure requests to send
 654         int             ppp_max_failure;                // max lcp configure naks to send
 655
 656         char            radiussecret[64];
 657         int             radius_accounting;
 658         int             radius_interim;
 659         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 660         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 661         uint8_t         numradiusservers;               // radius server count
 662
 663         uint16_t        radius_dae_port;                // port for radius DAE
 664         uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
 665         uint16_t        radius_bind_max;
 666
 667         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 668         int             radius_authtypes;
 669         int             radius_authprefer;
 670
 671         int             allow_duplicate_users;          // allow multiple logins with the same username
 672         int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
 673
 674         in_addr_t       default_dns1, default_dns2;
 675
 676         unsigned long   rl_rate;                        // default throttle rate
 677         int             num_tbfs;                       // number of throttle buckets
 678
 679         char            accounting_dir[128];
 680         in_addr_t       bind_address;
 681         in_addr_t       peer_address;
 682         int             send_garp;                      // Set to true to garp for vip address on startup
 683
 684         int             dump_speed;
 685         char            plugins[64][MAXPLUGINS];
 686         char            old_plugins[64][MAXPLUGINS];
 687
 688         int             next_tbf;                       // Next HTB id available to use
 689         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 690                                                         // policy for this process.
 691         int             lock_pages;                     // Lock pages into memory.
 692         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 693         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 694         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 695
 696         in_addr_t       cluster_address;                // Multicast address of cluster.
 697                                                         // Send to this address to have everyone hear.
 698         char            cluster_interface[64];          // Which interface to listen for multicast on.
 699         int             cluster_iam_master;             // Are we the cluster master???
 700         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 701         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 702                                                         // Zero if i am the cluster master.
 703         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 704                                                         // (or the seq number we're next expecting if we're a slave).
 705         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 706         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 707         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 708         int             cluster_highest_sessionid;
 709         int             cluster_highest_bundleid;
 710         int             cluster_highest_tunnelid;
 711         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 712         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 713         int             cluster_num_changes;            // Number of changes queued.
 714
 715         int             cluster_mcast_ttl;              // TTL for multicast packets
 716         int             cluster_hb_interval;            // How often to send a heartbeat.
 717         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 718         uint64_t        cluster_table_version;          // # state changes processed by cluster
 719
 720         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 721
 722
 723         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 724                                                         // slaves is less than this value.
 725         in_addr_t       cli_bind_address;               // bind address for CLI
 726         char            hostname[MAXHOSTNAME];  // hostname (overridden by -h on command line)
 727         // Guest change
 728         char            guest_user[MAXUSER];            // Guest account username
 729
 730 #ifdef BGP
 731 #define BGP_NUM_PEERS   2
 732         uint16_t as_number;
 733         struct {
 734                 char name[64];
 735                 uint16_t as;
 736                 int keepalive;
 737                 int hold;
 738                 struct in_addr update_source;
 739         } neighbour[BGP_NUM_PEERS];
 740         in_addr_t       nexthop_address;
 741         struct in6_addr nexthop6_address;
 742 #endif
 743 } configt;
 744
 745 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 746 typedef struct
 747 {
 748         char *key;
 749         int offset;
 750         int size;
 751         enum config_typet type;
 752 } config_descriptt;
 753
 754 typedef struct
 755 {
 756         uint8_t op;     // operation
 757 #define FILTER_PORT_OP_NONE     0 // all ports match
 758 #define FILTER_PORT_OP_EQ       1
 759 #define FILTER_PORT_OP_NEQ      2
 760 #define FILTER_PORT_OP_GT       3
 761 #define FILTER_PORT_OP_LT       4
 762 #define FILTER_PORT_OP_RANGE    5
 763         uint16_t port;  // port (host byte order)
 764         uint16_t port2; // range
 765 } ip_filter_portt;
 766
 767 typedef struct
 768 {
 769         int action;             // permit/deny
 770 #define FILTER_ACTION_DENY      1
 771 #define FILTER_ACTION_PERMIT    2
 772         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 773         in_addr_t src_ip;       // source ip (network byte order)
 774         in_addr_t src_wild;
 775         ip_filter_portt src_ports;
 776         in_addr_t dst_ip;       // dest ip
 777         in_addr_t dst_wild;
 778         ip_filter_portt dst_ports;
 779         uint8_t frag;           // apply to non-initial fragments
 780         uint8_t tcp_flag_op;    // match type: any, all, established
 781 #define FILTER_FLAG_OP_ANY      1
 782 #define FILTER_FLAG_OP_ALL      2
 783 #define FILTER_FLAG_OP_EST      3
 784         uint8_t tcp_sflags;     // flags set
 785         uint8_t tcp_cflags;     // flags clear
 786         uint32_t counter;       // match count
 787 } ip_filter_rulet;
 788
 789 #define TCP_FLAG_FIN    0x01
 790 #define TCP_FLAG_SYN    0x02
 791 #define TCP_FLAG_RST    0x04
 792 #define TCP_FLAG_PSH    0x08
 793 #define TCP_FLAG_ACK    0x10
 794 #define TCP_FLAG_URG    0x20
 795
 796 #define MAXFILTER               32
 797 #define MAXFILTER_RULES         32
 798 typedef struct
 799 {
 800         char name[32];          // ACL name
 801         int extended;           // type: 0 = standard, 1 = extended
 802         ip_filter_rulet rules[MAXFILTER_RULES];
 803         int used;               // session ref count
 804 } ip_filtert;
 805
 806 // CDN result/error codes
 807 #define CDN_NONE                        0, 0
 808 #define CDN_TRY_ANOTHER                 2, 7
 809 #define CDN_ADMIN_DISC                  3, 0
 810 #define CDN_UNAVAILABLE                 4, 0
 811
 812 // RADIUS Acct-Terminate-Cause values
 813 #define TERM_USER_REQUEST               1
 814 #define TERM_LOST_CARRIER               2
 815 #define TERM_LOST_SERVICE               3
 816 #define TERM_IDLE_TIMEOUT               4
 817 #define TERM_SESSION_TIMEOUT            5
 818 #define TERM_ADMIN_RESET                6
 819 #define TERM_ADMIN_REBOOT               7
 820 #define TERM_PORT_ERROR                 8
 821 #define TERM_NAS_ERROR                  9
 822 #define TERM_NAS_REQUEST                10
 823 #define TERM_NAS_REBOOT                 11
 824 #define TERM_PORT_UNNEEDED              12
 825 #define TERM_PORT_PREEMPTED             13
 826 #define TERM_PORT_SUSPENDED             14
 827 #define TERM_SERVICE_UNAVAILABLE        15
 828 #define TERM_CALLBACK                   16
 829 #define TERM_USER_ERROR                 17
 830 #define TERM_HOST_REQUEST               18
 831 #define TERM_SUPPLICANT_RESTART         19
 832 #define TERM_REAUTHENTICATION_FAILURE   20
 833 #define TERM_PORT_REINIT                21
 834 #define TERM_PORT_DISABLED              22
 835
 836 // arp.c
 837 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 838
 839
 840 // ppp.c
 841 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 842 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 843 void lcp_open(sessionidt s, tunnelidt t);
 844 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 845 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 846 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 847 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 848 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 849 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 850 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 851 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 852 void sendchap(sessionidt s, tunnelidt t);
 853 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);
 854 void sendlcp(sessionidt s, tunnelidt t);
 855 void send_ipin(sessionidt s, uint8_t *buf, int len);
 856 void sendccp(sessionidt s, tunnelidt t);
 857 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 858 int join_bundle(sessionidt s);
 859
 860
 861 // radius.c
 862 void initrad(void);
 863 void radiussend(uint16_t r, uint8_t state);
 864 void processrad(uint8_t *buf, int len, char socket_index);
 865 void radiusretry(uint16_t r);
 866 uint16_t radiusnew(sessionidt s);
 867 void radiusclear(uint16_t r, sessionidt s);
 868 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 869
 870
 871 // l2tpns.c
 872 clockt backoff(uint8_t try);
 873 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 874 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 875 sessionidt sessionbyip(in_addr_t ip);
 876 sessionidt sessionbyipv6(struct in6_addr ip);
 877 sessionidt sessionbyuser(char *username);
 878 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 879 void random_data(uint8_t *buf, int len);
 880 void sessionkill(sessionidt s, char *reason);
 881 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 882 void filter_session(sessionidt s, int filter_in, int filter_out);
 883 void send_garp(in_addr_t ip);
 884 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 885 int tun_write(uint8_t *data, int size);
 886 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 887 void sendipcp(sessionidt s, tunnelidt t);
 888 void sendipv6cp(sessionidt s, tunnelidt t);
 889 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 890 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 891 int find_filter(char const *name, size_t len);
 892 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 893 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 894 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 895 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 896
 897 #undef LOG
 898 #undef LOG_HEX
 899 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 900 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 901
 902 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 903 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 904
 905
 906 int sessionsetup(sessionidt s, tunnelidt t);
 907 int run_plugins(int plugin_type, void *data);
 908 void rebuild_address_pool(void);
 909 void throttle_session(sessionidt s, int rate_in, int rate_out);
 910 int load_session(sessionidt, sessiont *);
 911 void become_master(void);       // We're the master; kick off any required master initializations.
 912
 913
 914 // cli.c
 915 void init_cli();
 916 void cli_init_complete(char *hostname);
 917 void cli_do_file(FILE *fh);
 918 void cli_do(int sockfd);
 919 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 920
 921
 922 // icmp.c
 923 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 924
 925
 926 extern tunnelt *tunnel;
 927 extern bundlet *bundle;
 928 extern sessiont *session;
 929 extern sessionlocalt *sess_local;
 930 extern ippoolt *ip_address_pool;
 931 #define sessionfree (session[0].next)
 932
 933
 934 extern configt *config;
 935 extern time_t basetime;         // Time when this process started.
 936 extern time_t time_now;         // Seconds since EPOCH.
 937 extern char main_quit;
 938 extern uint32_t last_id;
 939 extern struct Tstats *_statistics;
 940 extern in_addr_t my_address;
 941 extern int clifd;
 942 extern int epollfd;
 943
 944 struct event_data {
 945         enum {
 946                 FD_TYPE_CLI,
 947                 FD_TYPE_CLUSTER,
 948                 FD_TYPE_TUN,
 949                 FD_TYPE_UDP,
 950                 FD_TYPE_CONTROL,
 951                 FD_TYPE_DAE,
 952                 FD_TYPE_RADIUS,
 953                 FD_TYPE_BGP,
 954                 FD_TYPE_NETLINK,
 955         } type;
 956         int index; // for RADIUS, BGP
 957 };
 958
 959 #define TIME (config->current_time)
 960
 961 extern uint16_t MRU;
 962 extern uint16_t MSS;
 963
 964 // macros for handling help in cli commands
 965 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 966 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 967
 968 #endif /* __L2TPNS_H__ */