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_ECHO_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         uint32_t jitteravg;
 265         uint16_t length;                // Fragment length
 266         uint8_t data[MAXFRAGLEN];       // Fragment data
 267 } fragmentt;
 268
 269 typedef struct
 270 {
 271         sessionidt next;                // next session in linked list
 272         sessionidt far;                 // far end session ID
 273         tunnelidt tunnel;               // near end tunnel ID
 274         uint8_t flags;                  // session flags: see SESSION_*
 275         struct {
 276                 uint8_t phase;          // PPP phase
 277                 uint8_t lcp:4;          //   LCP    state
 278                 uint8_t ipcp:4;         //   IPCP   state
 279                 uint8_t ipv6cp:4;       //   IPV6CP state
 280                 uint8_t ccp:4;          //   CCP    state
 281         } ppp;
 282         uint16_t mru;                   // maximum receive unit
 283         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 284         int ip_pool_index;              // index to IP pool
 285         uint32_t unique_id;             // unique session id
 286         uint32_t magic;                 // ppp magic number
 287         uint32_t pin, pout;             // packet counts
 288         uint32_t cin, cout;             // byte counts
 289         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 290         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 291         uint16_t throttle_in;           // upstream throttle rate (kbps)
 292         uint16_t throttle_out;          // downstream throttle rate
 293         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 294         uint8_t filter_out;             // output filter index
 295         uint16_t snoop_port;            // Interception destination port
 296         in_addr_t snoop_ip;             // Interception destination IP
 297         clockt opened;                  // when started
 298         clockt die;                     // being closed, when to finally free
 299         uint32_t session_timeout;       // Maximum session time in seconds
 300         uint32_t idle_timeout;          // Maximum idle time in seconds
 301         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 302         time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
 303         in_addr_t dns1, dns2;           // DNS servers
 304         routet route[MAXROUTE];         // static routes
 305         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 306         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 307         int random_vector_length;
 308         uint8_t random_vector[MAXTEL];
 309         char user[MAXUSER];             // user (needed in session for radius stop messages)
 310         char called[MAXTEL];            // called number
 311         char calling[MAXTEL];           // calling number
 312         uint32_t tx_connect_speed;
 313         uint32_t rx_connect_speed;
 314         clockt timeout;                 // Session timeout
 315         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 316         epdist epdis;                   // Multilink Endpoint Discriminator
 317         bundleidt bundle;               // Multilink Bundle Identifier
 318         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 319         uint8_t walled_garden;          // is this session gardened?
 320         uint8_t classlen;               // class (needed for radius accounting messages)
 321         char class[MAXCLASS];
 322         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 323         struct in6_addr ipv6route;      // Static IPv6 route
 324         char reserved[12];              // Space to expand structure without changing HB_VERSION
 325 }
 326 sessiont;
 327
 328 typedef struct
 329 {
 330         int state;                              // current state (bundlestate enum)
 331         uint32_t seq_num_t;                     // Sequence Number (transmission)
 332         uint32_t timeout;                       // Session-Timeout for bundle
 333         uint32_t max_seq;                       // Max value of sequence number field
 334         uint8_t num_of_links;                   // Number of links joint to this bundle
 335         uint32_t online_time;                   // The time this bundle is online
 336         clockt last_check;                      // Last time the timeout is checked
 337         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 338         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 339         epdist epdis;                           // Multilink Endpoint Discriminator
 340         char user[MAXUSER];                     // Needed for matching member links
 341         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 342         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 343 }
 344 bundlet;
 345
 346 typedef struct
 347 {
 348         fragmentt fragment[MAXFRAGNUM];
 349         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 350         uint16_t re_frame_len;                  // The reassembled frame length
 351         uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
 352         uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
 353         uint32_t M;                             // Minumum frame sequence number received over all bundle members
 354         uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
 355 }
 356 fragmentationt;
 357
 358 #define AUTHPAP         1       // allow PAP
 359 #define AUTHCHAP        2       // allow CHAP
 360
 361 typedef struct
 362 {
 363         // packet counters
 364         uint32_t pin;
 365         uint32_t pout;
 366
 367         // byte counters
 368         uint32_t cin;
 369         uint32_t cout;
 370
 371         // PPP restart timer/counters
 372         struct {
 373                 time_t restart;
 374                 int conf_sent;
 375                 int nak_sent;
 376         } lcp, ipcp, ipv6cp, ccp;
 377
 378         // identifier for Protocol-Reject, Code-Reject
 379         uint8_t lcp_ident;
 380
 381         // authentication to use
 382         int lcp_authtype;
 383
 384         // our MRU
 385         uint16_t ppp_mru;
 386
 387         // our MRRU
 388         uint16_t mp_mrru;
 389
 390         // our mssf
 391         uint16_t mp_mssf;
 392
 393         // our Endpoint Discriminator
 394         in_addr_t mp_epdis;
 395
 396         // DoS prevention
 397         clockt last_packet_out;
 398         uint32_t packets_out;
 399         uint32_t packets_dropped;
 400
 401         // RADIUS session in use
 402         uint16_t radius;
 403
 404         // interim RADIUS
 405         time_t last_interim;
 406
 407         // last LCP Echo
 408         time_t last_echo;
 409
 410         // Last Multilink frame sequence number received
 411         uint32_t last_seq;
 412
 413         // jitter average of the session
 414         uint32_t jitteravg;
 415         // time in milliseconds of the last fragment.
 416         uint64_t prev_time;
 417 } sessionlocalt;
 418
 419 // session flags
 420 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 421 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 422 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 423
 424 // 168 bytes per tunnel
 425 typedef struct
 426 {
 427         tunnelidt far;          // far end tunnel ID
 428         in_addr_t ip;           // Ip for far end
 429         uint16_t port;          // port for far end
 430         uint16_t window;        // Rx window
 431         uint16_t nr;            // next receive
 432         uint16_t ns;            // next send
 433         int state;              // current state (tunnelstate enum)
 434         clockt last;            // when last control message sent (used for resend timeout)
 435         clockt retry;           // when to try resending pending control
 436         clockt die;             // being closed, when to finally free
 437         clockt lastrec;         // when the last control message was received
 438         char hostname[128];     // tunnel hostname
 439         char vendor[128];       // LAC vendor
 440         uint8_t try;            // number of retrys on a control message
 441         uint16_t controlc;      // outstaind messages in queue
 442         controlt *controls;     // oldest message
 443         controlt *controle;     // newest message
 444 }
 445 tunnelt;
 446
 447 // 164 bytes per radius session
 448 typedef struct                  // outstanding RADIUS requests
 449 {
 450         sessionidt session;     // which session this applies to
 451         hasht auth;             // request authenticator
 452         clockt retry;           // when to try next
 453         char pass[129];         // password
 454         uint8_t id;             // ID for PPP response
 455         uint8_t try;            // which try we are on
 456         uint8_t state;          // state of radius requests
 457         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 458         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 459         char const *term_msg;   //   terminate reason
 460 }
 461 radiust;
 462
 463 typedef struct
 464 {
 465         in_addr_t       address;        // Host byte order..
 466         char            assigned;       // 1 if assigned, 0 if free
 467         sessionidt      session;
 468         clockt          last;           // last used
 469         char            user[129];      // user (try to have ip addresses persistent)
 470 }
 471 ippoolt;
 472
 473 #ifdef RINGBUFFER
 474 struct Tringbuffer
 475 {
 476         struct {
 477                 char level;
 478                 sessionidt session;
 479                 tunnelidt tunnel;
 480                 char message[MAX_LOG_LENGTH];
 481         } buffer[RINGBUFFER_SIZE];
 482         int head;
 483         int tail;
 484 };
 485 #endif
 486
 487 /*
 488  * Possible tunnel states
 489  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 490  */
 491 enum
 492 {
 493         TUNNELFREE,             // Not in use
 494         TUNNELOPEN,             // Active tunnel
 495         TUNNELDIE,              // Currently closing
 496         TUNNELOPENING,          // Busy opening
 497         TUNNELUNDEF,            // Undefined
 498 };
 499
 500 enum
 501 {
 502         BUNDLEFREE,             // Not in use
 503         BUNDLEOPEN,             // Active bundle
 504         BUNDLEUNDEF,            // Undefined
 505 };
 506
 507 enum
 508 {
 509         NULLCLASS = 0,          //End Point Discriminator classes
 510         LOCALADDR,
 511         IPADDR,
 512         IEEEMACADDR,
 513         PPPMAGIC,
 514         PSNDN,
 515 };
 516
 517 enum
 518 {
 519         RADIUSNULL,             // Not in use
 520         RADIUSCHAP,             // sending CHAP down PPP
 521         RADIUSAUTH,             // sending auth to RADIUS server
 522         RADIUSSTART,            // sending start accounting to RADIUS server
 523         RADIUSSTOP,             // sending stop accounting to RADIUS server
 524         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 525         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 526         RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning
 527 };
 528
 529 struct Tstats
 530 {
 531     time_t      start_time;
 532     time_t      last_reset;
 533
 534     uint32_t    tun_rx_packets;
 535     uint32_t    tun_tx_packets;
 536     uint32_t    tun_rx_bytes;
 537     uint32_t    tun_tx_bytes;
 538     uint32_t    tun_rx_errors;
 539     uint32_t    tun_tx_errors;
 540     uint32_t    tun_rx_dropped;
 541
 542     uint32_t    tunnel_rx_packets;
 543     uint32_t    tunnel_tx_packets;
 544     uint32_t    tunnel_rx_bytes;
 545     uint32_t    tunnel_tx_bytes;
 546     uint32_t    tunnel_rx_errors;
 547     uint32_t    tunnel_tx_errors;
 548
 549     uint32_t    tunnel_retries;
 550     uint32_t    radius_retries;
 551
 552     uint32_t    arp_sent;
 553
 554     uint32_t    packets_snooped;
 555
 556     uint32_t    tunnel_created;
 557     uint32_t    session_created;
 558     uint32_t    tunnel_timeout;
 559     uint32_t    session_timeout;
 560     uint32_t    radius_timeout;
 561     uint32_t    radius_overflow;
 562     uint32_t    tunnel_overflow;
 563     uint32_t    session_overflow;
 564
 565     uint32_t    ip_allocated;
 566     uint32_t    ip_freed;
 567
 568     uint32_t    c_forwarded;
 569     uint32_t    recv_forward;
 570
 571     uint32_t    select_called;
 572     uint32_t    multi_read_used;
 573     uint32_t    multi_read_exceeded;
 574
 575 #ifdef STATISTICS
 576     uint32_t    call_processtun;
 577     uint32_t    call_processipout;
 578     uint32_t    call_processipv6out;
 579     uint32_t    call_processudp;
 580     uint32_t    call_sessionbyip;
 581     uint32_t    call_sessionbyipv6;
 582     uint32_t    call_sessionbyuser;
 583     uint32_t    call_sendarp;
 584     uint32_t    call_sendipcp;
 585     uint32_t    call_sendipv6cp;
 586     uint32_t    call_processipv6cp;
 587     uint32_t    call_tunnelsend;
 588     uint32_t    call_sessionkill;
 589     uint32_t    call_sessionshutdown;
 590     uint32_t    call_tunnelkill;
 591     uint32_t    call_tunnelshutdown;
 592     uint32_t    call_assign_ip_address;
 593     uint32_t    call_free_ip_address;
 594     uint32_t    call_dump_acct_info;
 595     uint32_t    call_sessionsetup;
 596     uint32_t    call_processpap;
 597     uint32_t    call_processchap;
 598     uint32_t    call_processlcp;
 599     uint32_t    call_processipcp;
 600     uint32_t    call_processipin;
 601     uint32_t    call_processipv6in;
 602     uint32_t    call_processccp;
 603     uint32_t    call_sendchap;
 604     uint32_t    call_processrad;
 605     uint32_t    call_radiussend;
 606     uint32_t    call_radiusretry;
 607     uint32_t    call_random_data;
 608 #endif
 609 };
 610
 611 #ifdef STATISTICS
 612
 613 #ifdef STAT_CALLS
 614 #define CSTAT(x)        STAT(call_ ## x)
 615 #else
 616 #define CSTAT(x)
 617 #endif
 618
 619 #define STAT(x)         (_statistics->x++)
 620 #define INC_STAT(x,y)   (_statistics->x += (y))
 621 #define GET_STAT(x)     (_statistics->x)
 622 #define SET_STAT(x, y)  (_statistics->x = (y))
 623 #else
 624 #define CSTAT(x)
 625 #define STAT(x)
 626 #define INC_STAT(x,y)
 627 #define GET_STAT(x)     0
 628 #define SET_STAT(x, y)
 629 #endif
 630
 631 #ifndef IFNAMSIZ
 632 # define IFNAMSIZ 16
 633 #endif
 634
 635 typedef struct
 636 {
 637         int             debug;                          // debugging level
 638         time_t          start_time;                     // time when l2tpns was started
 639         char            bandwidth[256];                 // current bandwidth
 640         char            pid_file[256];                  // file to write PID to on startup
 641         int             wrote_pid;
 642         clockt          current_time;                   // 1/10ths of a second since the process started.
 643                                                         // means that we can only run a given process
 644                                                         // for 13 years without re-starting!
 645
 646         char            config_file[128];
 647         int             reload_config;                  // flag to re-read config (set by cli)
 648         int             multi_read_count;               // amount of packets to read per fd in processing loop
 649
 650         char            tundevice[IFNAMSIZ];            // tun device name
 651         char            log_filename[128];
 652
 653         char            l2tp_secret[64];                // L2TP shared secret
 654         int             l2tp_mtu;                       // MTU of interface used for L2TP
 655
 656         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 657
 658         int             ppp_restart_time;               // timeout for PPP restart
 659         int             ppp_max_configure;              // max lcp configure requests to send
 660         int             ppp_max_failure;                // max lcp configure naks to send
 661
 662         char            radiussecret[64];
 663         int             radius_accounting;
 664         int             radius_interim;
 665         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 666         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 667         uint8_t         numradiusservers;               // radius server count
 668
 669         uint16_t        radius_dae_port;                // port for radius DAE
 670         uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
 671         uint16_t        radius_bind_max;
 672
 673         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 674         int             radius_authtypes;
 675         int             radius_authprefer;
 676
 677         int             allow_duplicate_users;          // allow multiple logins with the same username
 678         int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
 679
 680         in_addr_t       default_dns1, default_dns2;
 681
 682         unsigned long   rl_rate;                        // default throttle rate
 683         int             num_tbfs;                       // number of throttle buckets
 684
 685         char            accounting_dir[128];
 686         in_addr_t       bind_address;
 687         in_addr_t       peer_address;
 688         int             send_garp;                      // Set to true to garp for vip address on startup
 689
 690         int             dump_speed;
 691         char            plugins[64][MAXPLUGINS];
 692         char            old_plugins[64][MAXPLUGINS];
 693
 694         int             next_tbf;                       // Next HTB id available to use
 695         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 696                                                         // policy for this process.
 697         int             lock_pages;                     // Lock pages into memory.
 698         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 699         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 700         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 701
 702         in_addr_t       cluster_address;                // Multicast address of cluster.
 703                                                         // Send to this address to have everyone hear.
 704         char            cluster_interface[64];          // Which interface to listen for multicast on.
 705         int             cluster_iam_master;             // Are we the cluster master???
 706         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 707         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 708                                                         // Zero if i am the cluster master.
 709         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 710                                                         // (or the seq number we're next expecting if we're a slave).
 711         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 712         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 713         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 714         int             cluster_highest_sessionid;
 715         int             cluster_highest_bundleid;
 716         int             cluster_highest_tunnelid;
 717         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 718         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 719         int             cluster_num_changes;            // Number of changes queued.
 720
 721         int             cluster_mcast_ttl;              // TTL for multicast packets
 722         int             cluster_hb_interval;            // How often to send a heartbeat.
 723         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 724         uint64_t        cluster_table_version;          // # state changes processed by cluster
 725
 726         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 727
 728
 729         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 730                                                         // slaves is less than this value.
 731         in_addr_t       cli_bind_address;               // bind address for CLI
 732         char            hostname[MAXHOSTNAME];  // hostname (overridden by -h on command line)
 733         // Guest change
 734         char            guest_user[MAXUSER];            // Guest account username
 735
 736 #ifdef BGP
 737 #define BGP_NUM_PEERS   2
 738         uint16_t as_number;
 739         struct {
 740                 char name[64];
 741                 uint16_t as;
 742                 int keepalive;
 743                 int hold;
 744                 struct in_addr update_source;
 745         } neighbour[BGP_NUM_PEERS];
 746         in_addr_t       nexthop_address;
 747         struct in6_addr nexthop6_address;
 748 #endif
 749
 750         int echo_timeout; // Time between last packet sent and LCP ECHO generation
 751         int idle_echo_timeout; // Time between last packet seen and
 752                                                    // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
 753 } configt;
 754
 755 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 756 typedef struct
 757 {
 758         char *key;
 759         int offset;
 760         int size;
 761         enum config_typet type;
 762 } config_descriptt;
 763
 764 typedef struct
 765 {
 766         uint8_t op;     // operation
 767 #define FILTER_PORT_OP_NONE     0 // all ports match
 768 #define FILTER_PORT_OP_EQ       1
 769 #define FILTER_PORT_OP_NEQ      2
 770 #define FILTER_PORT_OP_GT       3
 771 #define FILTER_PORT_OP_LT       4
 772 #define FILTER_PORT_OP_RANGE    5
 773         uint16_t port;  // port (host byte order)
 774         uint16_t port2; // range
 775 } ip_filter_portt;
 776
 777 typedef struct
 778 {
 779         int action;             // permit/deny
 780 #define FILTER_ACTION_DENY      1
 781 #define FILTER_ACTION_PERMIT    2
 782         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 783         in_addr_t src_ip;       // source ip (network byte order)
 784         in_addr_t src_wild;
 785         ip_filter_portt src_ports;
 786         in_addr_t dst_ip;       // dest ip
 787         in_addr_t dst_wild;
 788         ip_filter_portt dst_ports;
 789         uint8_t frag;           // apply to non-initial fragments
 790         uint8_t tcp_flag_op;    // match type: any, all, established
 791 #define FILTER_FLAG_OP_ANY      1
 792 #define FILTER_FLAG_OP_ALL      2
 793 #define FILTER_FLAG_OP_EST      3
 794         uint8_t tcp_sflags;     // flags set
 795         uint8_t tcp_cflags;     // flags clear
 796         uint32_t counter;       // match count
 797 } ip_filter_rulet;
 798
 799 #define TCP_FLAG_FIN    0x01
 800 #define TCP_FLAG_SYN    0x02
 801 #define TCP_FLAG_RST    0x04
 802 #define TCP_FLAG_PSH    0x08
 803 #define TCP_FLAG_ACK    0x10
 804 #define TCP_FLAG_URG    0x20
 805
 806 #define MAXFILTER               32
 807 #define MAXFILTER_RULES         32
 808 typedef struct
 809 {
 810         char name[32];          // ACL name
 811         int extended;           // type: 0 = standard, 1 = extended
 812         ip_filter_rulet rules[MAXFILTER_RULES];
 813         int used;               // session ref count
 814 } ip_filtert;
 815
 816 // CDN result/error codes
 817 #define CDN_NONE                        0, 0
 818 #define CDN_TRY_ANOTHER                 2, 7
 819 #define CDN_ADMIN_DISC                  3, 0
 820 #define CDN_UNAVAILABLE                 4, 0
 821
 822 // RADIUS Acct-Terminate-Cause values
 823 #define TERM_USER_REQUEST               1
 824 #define TERM_LOST_CARRIER               2
 825 #define TERM_LOST_SERVICE               3
 826 #define TERM_IDLE_TIMEOUT               4
 827 #define TERM_SESSION_TIMEOUT            5
 828 #define TERM_ADMIN_RESET                6
 829 #define TERM_ADMIN_REBOOT               7
 830 #define TERM_PORT_ERROR                 8
 831 #define TERM_NAS_ERROR                  9
 832 #define TERM_NAS_REQUEST                10
 833 #define TERM_NAS_REBOOT                 11
 834 #define TERM_PORT_UNNEEDED              12
 835 #define TERM_PORT_PREEMPTED             13
 836 #define TERM_PORT_SUSPENDED             14
 837 #define TERM_SERVICE_UNAVAILABLE        15
 838 #define TERM_CALLBACK                   16
 839 #define TERM_USER_ERROR                 17
 840 #define TERM_HOST_REQUEST               18
 841 #define TERM_SUPPLICANT_RESTART         19
 842 #define TERM_REAUTHENTICATION_FAILURE   20
 843 #define TERM_PORT_REINIT                21
 844 #define TERM_PORT_DISABLED              22
 845
 846 // arp.c
 847 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 848
 849
 850 // ppp.c
 851 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 852 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 853 void lcp_open(sessionidt s, tunnelidt t);
 854 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 855 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 856 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 857 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 858 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 859 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 860 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 861 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 862 void sendchap(sessionidt s, tunnelidt t);
 863 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);
 864 void sendlcp(sessionidt s, tunnelidt t);
 865 void send_ipin(sessionidt s, uint8_t *buf, int len);
 866 void sendccp(sessionidt s, tunnelidt t);
 867 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 868 int join_bundle(sessionidt s);
 869
 870
 871 // radius.c
 872 void initrad(void);
 873 void radiussend(uint16_t r, uint8_t state);
 874 void processrad(uint8_t *buf, int len, char socket_index);
 875 void radiusretry(uint16_t r);
 876 uint16_t radiusnew(sessionidt s);
 877 void radiusclear(uint16_t r, sessionidt s);
 878 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 879
 880
 881 // l2tpns.c
 882 clockt backoff(uint8_t try);
 883 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 884 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 885 sessionidt sessionbyip(in_addr_t ip);
 886 sessionidt sessionbyipv6(struct in6_addr ip);
 887 sessionidt sessionbyuser(char *username);
 888 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 889 void random_data(uint8_t *buf, int len);
 890 void sessionkill(sessionidt s, char *reason);
 891 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 892 void filter_session(sessionidt s, int filter_in, int filter_out);
 893 void send_garp(in_addr_t ip);
 894 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 895 int tun_write(uint8_t *data, int size);
 896 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 897 void sendipcp(sessionidt s, tunnelidt t);
 898 void sendipv6cp(sessionidt s, tunnelidt t);
 899 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 900 void processipout(uint8_t *buf, int len);
 901 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 902 int find_filter(char const *name, size_t len);
 903 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 904 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 905 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 906 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 907
 908 #undef LOG
 909 #undef LOG_HEX
 910 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 911 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 912
 913 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 914 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 915
 916
 917 int sessionsetup(sessionidt s, tunnelidt t);
 918 int run_plugins(int plugin_type, void *data);
 919 void rebuild_address_pool(void);
 920 void throttle_session(sessionidt s, int rate_in, int rate_out);
 921 int load_session(sessionidt, sessiont *);
 922 void become_master(void);       // We're the master; kick off any required master initializations.
 923
 924
 925 // cli.c
 926 void init_cli();
 927 void cli_init_complete(char *hostname);
 928 void cli_do_file(FILE *fh);
 929 void cli_do(int sockfd);
 930 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 931
 932
 933 // icmp.c
 934 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 935
 936
 937 extern tunnelt *tunnel;
 938 extern bundlet *bundle;
 939 extern sessiont *session;
 940 extern sessionlocalt *sess_local;
 941 extern ippoolt *ip_address_pool;
 942 #define sessionfree (session[0].next)
 943
 944
 945 extern configt *config;
 946 extern time_t basetime;         // Time when this process started.
 947 extern time_t time_now;         // Seconds since EPOCH.
 948 extern char main_quit;
 949 extern uint32_t last_id;
 950 extern struct Tstats *_statistics;
 951 extern in_addr_t my_address;
 952 extern int clifd;
 953 extern int epollfd;
 954
 955 struct event_data {
 956         enum {
 957                 FD_TYPE_CLI,
 958                 FD_TYPE_CLUSTER,
 959                 FD_TYPE_TUN,
 960                 FD_TYPE_UDP,
 961                 FD_TYPE_CONTROL,
 962                 FD_TYPE_DAE,
 963                 FD_TYPE_RADIUS,
 964                 FD_TYPE_BGP,
 965                 FD_TYPE_NETLINK,
 966         } type;
 967         int index; // for RADIUS, BGP
 968 };
 969
 970 #define TIME (config->current_time)
 971
 972 extern uint16_t MRU;
 973 extern uint16_t MSS;
 974
 975 // macros for handling help in cli commands
 976 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 977 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 978
 979 #endif /* __L2TPNS_H__ */