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 <net/ethernet.h>
  13 #include <sys/socket.h>
  14 #include <arpa/inet.h>
  15 #include <sys/types.h>
  16 #include <libcli.h>
  17
  18 #define VERSION "2.2.1"
  19
  20 // Limits
  21 #define MAXTUNNEL       500             // could be up to 65535
  22 #define MAXBUNDLE       300             // could be up to 65535
  23 #define MAXBUNDLESES    12              // Maximum number of member links in bundle
  24 #define MAXADDRESS      20              // Maximum length for the Endpoint Discrminiator address
  25 #define MAXSESSION      60000           // could be up to 65535
  26 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  27 #define MAXSESSINGRP    12              // Maximum number of member links in grouped session
  28 #define MAXGROUPE               300     // could be up to 65535, Maximum number of grouped session
  29 #define MAXROUTEINGRP   15              // max static routes per group
  30
  31 // Tunnel Id reserved for pppoe
  32 #define TUNNEL_ID_PPPOE 1
  33
  34 #define RADIUS_SHIFT    6
  35 #define RADIUS_FDS      (1 << RADIUS_SHIFT)
  36 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  37 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  38
  39 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  40 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  41
  42 #define MAXCONTROL      1000            // max length control message we ever send...
  43 #define MINMTU          576             // minimum recommended MTU (rfc1063)
  44 #define MAXMTU          2600            // arbitrary maximum MTU
  45 #define PPPoE_MRU       1492            // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
  46 #define MAXETHER        (MAXMTU+18)     // max packet we try sending to tun
  47 #define MAXTEL          96              // telephone number
  48 #define MAXHOSTNAME     256             // hostname
  49 #define MAXUSER         128             // username
  50 #define MAXPASS         128             // password
  51 #define MAXCLASS        128             // radius class attribute size
  52 #define MAXPLUGINS      20              // maximum number of plugins to load
  53 #define MAXRADSERVER    10              // max radius servers
  54 #define MAXROUTE        10              // max static routes per session
  55 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  56 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  57 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  58 #define ECHO_TIMEOUT    10              // Time between last packet sent and LCP ECHO generation
  59 #define IDLE_ECHO_TIMEOUT       240             // Time between last packet seen and session shutdown
  60 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  61
  62 #define MP_BEGIN        0x80            // This value is used when (b)egin bit is set in MP header
  63 #define MP_END          0x40            // This value is used when (e)nd bit is set in MP header
  64 #define MP_BOTH_BITS    0xC0            // This value is used when both bits (begin and end) are set in MP header
  65
  66 #define MINFRAGLEN      64              // Minumum fragment length
  67 #define MAXFRAGLEN      1496    // Maximum length for Multilink fragment (The multilink may contain only one link)
  68 #define MAXFRAGNUM      512             // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
  69                                         // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
  70 #define MAXFRAGNUM_MASK (MAXFRAGNUM - 1)                // Must be equal to MAXFRAGNUM-1
  71
  72 // Multi bind address constants
  73 #define MAX_UDPFD 4
  74 #define MAX_BINDADDR MAX_UDPFD
  75 // 4 + 1 for the udplac
  76 #define INIT_TABUDPFD {-1, -1, -1, -1, -1}
  77 #define INIT_TABUDPVAR {0, 0, 0, 0, 0}
  78
  79 // Constants
  80 #ifndef ETCDIR
  81 #define ETCDIR          "/etc/l2tpns"
  82 #endif
  83
  84 #ifndef LIBDIR
  85 #define LIBDIR          "/usr/lib/l2tpns"
  86 #endif
  87
  88 #ifndef PLUGINDIR
  89 #define PLUGINDIR       LIBDIR          // Plugins
  90 #endif
  91
  92 #ifndef PLUGINCONF
  93 #define PLUGINCONF      ETCDIR          // Plugin config dir
  94 #endif
  95
  96 #ifndef FLASHDIR
  97 #define FLASHDIR        ETCDIR
  98 #endif
  99
 100 #define TUNDEVICE       "/dev/net/tun"
 101 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
 102 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
 103 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
 104 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
 105 #define ACCT_TIME       3000                            // 5 minute accounting interval
 106 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
 107 #define L2TPPORT        1701                            // L2TP port
 108 #define RADPORT         1645                            // old radius port...
 109 #define DAEPORT         3799                            // DAE port
 110 #define PKTARP          0x0806                          // ARP packet type
 111 #define PKTIP           0x0800                          // IPv4 packet type
 112 #define PKTIPV6         0x86DD                          // IPv6 packet type
 113 #define PPPPAP          0xC023
 114 #define PPPCHAP         0xC223
 115 #define PPPLCP          0xC021
 116 #define PPPIPCP         0x8021
 117 #define PPPIPV6CP       0x8057
 118 #define PPPCCP          0x80FD
 119 #define PPPIP           0x0021
 120 #define PPPIPV6         0x0057
 121 #define PPPMP           0x003D
 122 #define MIN_IP_SIZE     0x19
 123
 124 enum {
 125         ConfigReq = 1,
 126         ConfigAck,
 127         ConfigNak,
 128         ConfigRej,
 129         TerminateReq,
 130         TerminateAck,
 131         CodeRej,
 132         ProtocolRej,
 133         EchoReq,
 134         EchoReply,
 135         DiscardRequest,
 136         IdentRequest
 137 };
 138
 139 enum {
 140         AccessRequest = 1,
 141         AccessAccept,
 142         AccessReject,
 143         AccountingRequest,
 144         AccountingResponse,
 145         AccessChallenge = 11,
 146         DisconnectRequest = 40,
 147         DisconnectACK,
 148         DisconnectNAK,
 149         CoARequest,
 150         CoAACK,
 151         CoANAK
 152 };
 153
 154 // PPP phases
 155 enum {
 156         Dead,
 157         Establish,
 158         Authenticate,
 159         Network,
 160         Terminate
 161 };
 162
 163 // PPP states
 164 enum {
 165         Initial,
 166         Starting,
 167         Closed,
 168         Stopped,
 169         Closing,
 170         Stopping,
 171         RequestSent,
 172         AckReceived,
 173         AckSent,
 174         Opened
 175 };
 176
 177 // reset state machine counters
 178 #define initialise_restart_count(_s, _fsm)                      \
 179         sess_local[_s]._fsm.conf_sent =                         \
 180         sess_local[_s]._fsm.nak_sent = 0
 181
 182 // no more attempts
 183 #define zero_restart_count(_s, _fsm) ({                         \
 184         sess_local[_s]._fsm.conf_sent =                         \
 185                 config->ppp_max_configure;                      \
 186         sess_local[_s]._fsm.restart =                           \
 187                 time_now + config->ppp_restart_time;            \
 188 })
 189
 190 // increment ConfReq counter and reset timer
 191 #define restart_timer(_s, _fsm) ({                              \
 192         sess_local[_s]._fsm.conf_sent++;                        \
 193         sess_local[_s]._fsm.restart =                           \
 194                 time_now + config->ppp_restart_time;            \
 195 })
 196
 197 // stop timer on change to state where timer does not run
 198 #define change_state(_s, _fsm, _new) ({                         \
 199         if (_new != session[_s].ppp._fsm)                       \
 200         {                                                       \
 201                 switch (_new)                                   \
 202                 {                                               \
 203                 case Initial:                                   \
 204                 case Starting:                                  \
 205                 case Closed:                                    \
 206                 case Stopped:                                   \
 207                 case Opened:                                    \
 208                         sess_local[_s]._fsm.restart = 0;        \
 209                         initialise_restart_count(_s, _fsm);     \
 210                 }                                               \
 211                 session[_s].ppp._fsm = _new;                    \
 212                 cluster_send_session(_s);                       \
 213         }                                                       \
 214 })
 215
 216 // Types
 217 typedef uint16_t sessionidt;
 218 typedef uint16_t bundleidt;
 219 typedef uint16_t tunnelidt;
 220 typedef uint16_t groupidt;
 221 typedef uint32_t clockt;
 222 typedef uint8_t hasht[16];
 223
 224 // CLI actions
 225 struct cli_session_actions {
 226         char action;
 227         in_addr_t snoop_ip;
 228         uint16_t snoop_port;
 229         int throttle_in;
 230         int throttle_out;
 231         int filter_in;
 232         int filter_out;
 233 };
 234
 235 #define CLI_SESS_KILL           0x01
 236 #define CLI_SESS_SNOOP          0x02
 237 #define CLI_SESS_NOSNOOP        0x04
 238 #define CLI_SESS_THROTTLE       0x08
 239 #define CLI_SESS_NOTHROTTLE     0x10
 240 #define CLI_SESS_FILTER         0x20
 241 #define CLI_SESS_NOFILTER       0x40
 242
 243 struct cli_tunnel_actions {
 244         char action;
 245 };
 246
 247 #define CLI_TUN_KILL            0x01
 248
 249 // structures
 250 typedef struct                  // route
 251 {
 252         in_addr_t ip;
 253         int prefixlen;
 254 }
 255 routet;
 256
 257 typedef struct controls         // control message
 258 {
 259         struct controls *next;  // next in queue
 260         uint16_t length;        // length
 261         uint8_t buf[MAXCONTROL];
 262 }
 263 controlt;
 264
 265 typedef struct {
 266         uint8_t length;                 // Endpoint Discriminator length
 267         uint8_t addr_class;             // Endpoint Discriminator class
 268         uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
 269 } epdist;
 270
 271 typedef struct {
 272         sessionidt sid;                 // Fragment originating session
 273         tunnelidt tid;                  // Fragment originating tunnel
 274         uint8_t flags;                  // MP frame flags
 275         uint32_t seq;                   // fragment seq num
 276         uint32_t jitteravg;
 277         uint16_t length;                // Fragment length
 278         uint8_t data[MAXFRAGLEN];       // Fragment data
 279 } fragmentt;
 280
 281 typedef struct
 282 {
 283         sessionidt next;                // next session in linked list
 284         sessionidt far;                 // far end session ID
 285         tunnelidt tunnel;               // near end tunnel ID
 286         uint8_t flags;                  // session flags: see SESSION_*
 287         struct {
 288                 uint8_t phase;          // PPP phase
 289                 uint8_t lcp:4;          //   LCP    state
 290                 uint8_t ipcp:4;         //   IPCP   state
 291                 uint8_t ipv6cp:4;       //   IPV6CP state
 292                 uint8_t ccp:4;          //   CCP    state
 293         } ppp;
 294         uint16_t mru;                   // maximum receive unit
 295         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 296         int ip_pool_index;              // index to IP pool
 297         uint32_t unique_id;             // unique session id
 298         uint32_t magic;                 // ppp magic number
 299         uint32_t pin, pout;             // packet counts
 300         uint32_t cin, cout;             // byte counts
 301         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 302         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 303         uint16_t throttle_in;           // upstream throttle rate (kbps)
 304         uint16_t throttle_out;          // downstream throttle rate
 305         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 306         uint8_t filter_out;             // output filter index
 307         uint16_t snoop_port;            // Interception destination port
 308         in_addr_t snoop_ip;             // Interception destination IP
 309         clockt opened;                  // when started
 310         clockt die;                     // being closed, when to finally free
 311         uint32_t session_timeout;       // Maximum session time in seconds
 312         uint32_t idle_timeout;          // Maximum idle time in seconds
 313         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 314         time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
 315         in_addr_t dns1, dns2;           // DNS servers
 316         routet route[MAXROUTE];         // static routes
 317         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 318         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 319         int random_vector_length;
 320         uint8_t random_vector[MAXTEL];
 321         char user[MAXUSER];             // user (needed in session for radius stop messages)
 322         char called[MAXTEL];            // called number
 323         char calling[MAXTEL];           // calling number
 324         uint32_t tx_connect_speed;
 325         uint32_t rx_connect_speed;
 326         clockt timeout;                 // Session timeout
 327         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 328         epdist epdis;                   // Multilink Endpoint Discriminator
 329         bundleidt bundle;               // Multilink Bundle Identifier
 330         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 331         uint8_t walled_garden;          // is this session gardened?
 332         uint8_t classlen;               // class (needed for radius accounting messages)
 333         char class[MAXCLASS];
 334         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 335         struct in6_addr ipv6route;      // Static IPv6 route
 336         sessionidt forwardtosession;    // LNS id_session to forward
 337         uint8_t src_hwaddr[ETH_ALEN];   // MAC addr source (for pppoe sessions 6 bytes)
 338         char reserved[4];                               // Space to expand structure without changing HB_VERSION
 339 }
 340 sessiont;
 341
 342 typedef struct
 343 {
 344         uint32_t tx_rate;
 345         uint32_t prev_coutgrp;
 346         sessionidt sid;
 347         uint8_t weight;
 348 }
 349 groupsesslistt;
 350
 351 typedef struct
 352 {
 353         int state;                              // current state (groupestate enum)
 354         uint32_t time_changed;
 355         groupidt prev;
 356         sessionidt smax;
 357         sessionidt smin;
 358         groupsesslistt sesslist[MAXSESSINGRP];
 359         routet route[MAXROUTEINGRP];            // static routes
 360         uint8_t nbroutesgrp;
 361         uint8_t nbsession;
 362 }
 363 groupsesst;
 364
 365 union iphash
 366 {
 367         sessionidt sess;
 368         union iphash *idx;
 369 };                      // Mapping from IP address to session structures.
 370
 371 typedef struct
 372 {
 373         int state;                              // current state (bundlestate enum)
 374         uint32_t seq_num_t;                     // Sequence Number (transmission)
 375         uint32_t timeout;                       // Session-Timeout for bundle
 376         uint32_t max_seq;                       // Max value of sequence number field
 377         uint8_t num_of_links;                   // Number of links joint to this bundle
 378         uint32_t online_time;                   // The time this bundle is online
 379         clockt last_check;                      // Last time the timeout is checked
 380         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 381         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 382         epdist epdis;                           // Multilink Endpoint Discriminator
 383         char user[MAXUSER];                     // Needed for matching member links
 384         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 385         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 386 }
 387 bundlet;
 388
 389 typedef struct
 390 {
 391         fragmentt fragment[MAXFRAGNUM];
 392         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 393         uint16_t re_frame_len;                  // The reassembled frame length
 394         uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
 395         uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
 396         uint32_t M;                             // Minumum frame sequence number received over all bundle members
 397         uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
 398 }
 399 fragmentationt;
 400
 401 #define AUTHPAP         1       // allow PAP
 402 #define AUTHCHAP        2       // allow CHAP
 403
 404 typedef struct
 405 {
 406         // packet counters
 407         uint32_t pin;
 408         uint32_t pout;
 409
 410         // byte counters
 411         uint32_t cin;
 412         uint32_t cout;
 413
 414         // PPP restart timer/counters
 415         struct {
 416                 time_t restart;
 417                 int conf_sent;
 418                 int nak_sent;
 419         } lcp, ipcp, ipv6cp, ccp;
 420
 421         // identifier for Protocol-Reject, Code-Reject
 422         uint8_t lcp_ident;
 423
 424         // authentication to use
 425         int lcp_authtype;
 426
 427         // our MRU
 428         uint16_t ppp_mru;
 429
 430         // our MRRU
 431         uint16_t mp_mrru;
 432
 433         // our mssf
 434         uint16_t mp_mssf;
 435
 436         // our Endpoint Discriminator
 437         in_addr_t mp_epdis;
 438
 439         // DoS prevention
 440         clockt last_packet_out;
 441         uint32_t packets_out;
 442         uint32_t packets_dropped;
 443
 444         // RADIUS session in use
 445         uint16_t radius;
 446
 447         // interim RADIUS
 448         time_t last_interim;
 449
 450         // last LCP Echo
 451         time_t last_echo;
 452
 453         // Last Multilink frame sequence number received
 454         uint32_t last_seq;
 455
 456         // jitter average of the session
 457         uint32_t jitteravg;
 458         // time in milliseconds of the last fragment.
 459         uint64_t prev_time;
 460 } sessionlocalt;
 461
 462 // session flags
 463 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 464 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 465 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 466
 467 // 328 bytes per tunnel
 468 typedef struct
 469 {
 470         tunnelidt far;          // far end tunnel ID
 471         in_addr_t ip;           // Ip for far end
 472         uint16_t port;          // port for far end
 473         uint16_t window;        // Rx window
 474         uint16_t nr;            // next receive
 475         uint16_t ns;            // next send
 476         int state;              // current state (tunnelstate enum)
 477         clockt last;            // when last control message sent (used for resend timeout)
 478         clockt retry;           // when to try resending pending control
 479         clockt die;             // being closed, when to finally free
 480         clockt lastrec;         // when the last control message was received
 481         char hostname[128];     // tunnel hostname
 482         char vendor[128];       // LAC vendor
 483         uint8_t try;            // number of retrys on a control message
 484         uint16_t controlc;      // outstaind messages in queue
 485         controlt *controls;     // oldest message
 486         controlt *controle;     // newest message
 487         uint16_t isremotelns;   // != 0 if the tunnel is to remote LNS (== index on the conf remote lns)
 488         uint16_t indexudp;      // Index UDP file handle (in udpfd[])
 489         char reserved[12];              // Space to expand structure without changing HB_VERSION
 490 }
 491 tunnelt;
 492
 493 // 164 bytes per radius session
 494 typedef struct                  // outstanding RADIUS requests
 495 {
 496         sessionidt session;     // which session this applies to
 497         hasht auth;             // request authenticator
 498         clockt retry;           // when to try next
 499         char pass[129];         // password
 500         uint8_t id;             // ID for PPP response
 501         uint8_t try;            // which try we are on
 502         uint8_t state;          // state of radius requests
 503         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 504         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 505         char const *term_msg;   //   terminate reason
 506 }
 507 radiust;
 508
 509 typedef struct
 510 {
 511         in_addr_t       address;        // Host byte order..
 512         char            assigned;       // 1 if assigned, 0 if free
 513         sessionidt      session;
 514         clockt          last;           // last used
 515         char            user[129];      // user (try to have ip addresses persistent)
 516 }
 517 ippoolt;
 518
 519 #ifdef RINGBUFFER
 520 struct Tringbuffer
 521 {
 522         struct {
 523                 char level;
 524                 sessionidt session;
 525                 tunnelidt tunnel;
 526                 char message[MAX_LOG_LENGTH];
 527         } buffer[RINGBUFFER_SIZE];
 528         int head;
 529         int tail;
 530 };
 531 #endif
 532
 533 /*
 534  * Possible tunnel states
 535  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 536  */
 537 enum
 538 {
 539         TUNNELFREE,             // Not in use
 540         TUNNELOPEN,             // Active tunnel
 541         TUNNELDIE,              // Currently closing
 542         TUNNELOPENING,          // Busy opening
 543         TUNNELUNDEF,            // Undefined
 544 };
 545
 546 enum
 547 {
 548         BUNDLEFREE,             // Not in use
 549         BUNDLEOPEN,             // Active bundle
 550         BUNDLEUNDEF,            // Undefined
 551 };
 552
 553 enum
 554 {
 555         GROUPEFREE,             // Not in use
 556         GROUPEOPEN,             // Active bundle
 557         GROUPEUNDEF             // Undefined
 558 };
 559
 560 enum
 561 {
 562         NULLCLASS = 0,          //End Point Discriminator classes
 563         LOCALADDR,
 564         IPADDR,
 565         IEEEMACADDR,
 566         PPPMAGIC,
 567         PSNDN,
 568 };
 569
 570 enum
 571 {
 572         RADIUSNULL,             // Not in use
 573         RADIUSCHAP,             // sending CHAP down PPP
 574         RADIUSAUTH,             // sending auth to RADIUS server
 575         RADIUSSTART,            // sending start accounting to RADIUS server
 576         RADIUSSTOP,             // sending stop accounting to RADIUS server
 577         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 578         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 579         RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning
 580 };
 581
 582 struct Tstats
 583 {
 584     time_t      start_time;
 585     time_t      last_reset;
 586
 587     uint32_t    tun_rx_packets;
 588     uint32_t    tun_tx_packets;
 589     uint32_t    tun_rx_bytes;
 590     uint32_t    tun_tx_bytes;
 591     uint32_t    tun_rx_errors;
 592     uint32_t    tun_tx_errors;
 593     uint32_t    tun_rx_dropped;
 594
 595     uint32_t    tunnel_rx_packets;
 596     uint32_t    tunnel_tx_packets;
 597     uint32_t    tunnel_rx_bytes;
 598     uint32_t    tunnel_tx_bytes;
 599     uint32_t    tunnel_rx_errors;
 600     uint32_t    tunnel_tx_errors;
 601
 602     uint32_t    tunnel_retries;
 603     uint32_t    radius_retries;
 604
 605     uint32_t    arp_sent;
 606
 607     uint32_t    packets_snooped;
 608
 609     uint32_t    tunnel_created;
 610     uint32_t    session_created;
 611     uint32_t    tunnel_timeout;
 612     uint32_t    session_timeout;
 613     uint32_t    radius_timeout;
 614     uint32_t    radius_overflow;
 615     uint32_t    tunnel_overflow;
 616     uint32_t    session_overflow;
 617
 618     uint32_t    ip_allocated;
 619     uint32_t    ip_freed;
 620
 621     uint32_t    c_forwarded;
 622     uint32_t    recv_forward;
 623
 624     uint32_t    select_called;
 625     uint32_t    multi_read_used;
 626     uint32_t    multi_read_exceeded;
 627
 628 #ifdef STATISTICS
 629     uint32_t    call_processtun;
 630     uint32_t    call_processipout;
 631     uint32_t    call_processipv6out;
 632     uint32_t    call_processudp;
 633     uint32_t    call_sessionbyip;
 634     uint32_t    call_sessionbyipv6;
 635     uint32_t    call_sessionbyuser;
 636     uint32_t    call_sendarp;
 637     uint32_t    call_sendipcp;
 638     uint32_t    call_sendipv6cp;
 639     uint32_t    call_processipv6cp;
 640     uint32_t    call_tunnelsend;
 641     uint32_t    call_sessionkill;
 642     uint32_t    call_sessionshutdown;
 643     uint32_t    call_tunnelkill;
 644     uint32_t    call_tunnelshutdown;
 645     uint32_t    call_assign_ip_address;
 646     uint32_t    call_free_ip_address;
 647     uint32_t    call_dump_acct_info;
 648     uint32_t    call_sessionsetup;
 649     uint32_t    call_processpap;
 650     uint32_t    call_processchap;
 651     uint32_t    call_processlcp;
 652     uint32_t    call_processipcp;
 653     uint32_t    call_processipin;
 654     uint32_t    call_processipv6in;
 655     uint32_t    call_processccp;
 656     uint32_t    call_sendchap;
 657     uint32_t    call_processrad;
 658     uint32_t    call_radiussend;
 659     uint32_t    call_radiusretry;
 660     uint32_t    call_random_data;
 661 #endif
 662 };
 663
 664 #ifdef STATISTICS
 665
 666 #ifdef STAT_CALLS
 667 #define CSTAT(x)        STAT(call_ ## x)
 668 #else
 669 #define CSTAT(x)
 670 #endif
 671
 672 #define STAT(x)         (_statistics->x++)
 673 #define INC_STAT(x,y)   (_statistics->x += (y))
 674 #define GET_STAT(x)     (_statistics->x)
 675 #define SET_STAT(x, y)  (_statistics->x = (y))
 676 #else
 677 #define CSTAT(x)
 678 #define STAT(x)
 679 #define INC_STAT(x,y)
 680 #define GET_STAT(x)     0
 681 #define SET_STAT(x, y)
 682 #endif
 683
 684 #ifndef IFNAMSIZ
 685 # define IFNAMSIZ 16
 686 #endif
 687
 688 typedef struct
 689 {
 690         int             debug;                          // debugging level
 691         time_t          start_time;                     // time when l2tpns was started
 692         char            bandwidth[256];                 // current bandwidth
 693         char            pid_file[256];                  // file to write PID to on startup
 694         int             wrote_pid;
 695         clockt          current_time;                   // 1/10ths of a second since the process started.
 696                                                         // means that we can only run a given process
 697                                                         // for 13 years without re-starting!
 698
 699         char            config_file[128];
 700         int             reload_config;                  // flag to re-read config (set by cli)
 701         int             multi_read_count;               // amount of packets to read per fd in processing loop
 702
 703         char            tundevicename[IFNAMSIZ];                // tun device name
 704         char            log_filename[128];
 705
 706         char            l2tp_secret[64];                // L2TP shared secret
 707         int             l2tp_mtu;                       // MTU of interface used for L2TP
 708
 709         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 710
 711         int             ppp_restart_time;               // timeout for PPP restart
 712         int             ppp_max_configure;              // max lcp configure requests to send
 713         int             ppp_max_failure;                // max lcp configure naks to send
 714
 715         char            radiussecret[64];
 716         int             radius_accounting;
 717         int             radius_interim;
 718         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 719         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 720         uint8_t         numradiusservers;               // radius server count
 721
 722         uint16_t        radius_dae_port;                // port for radius DAE
 723         uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
 724         uint16_t        radius_bind_max;
 725
 726         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 727         int             radius_authtypes;
 728         int             radius_authprefer;
 729
 730         int             allow_duplicate_users;          // allow multiple logins with the same username
 731         int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
 732
 733         in_addr_t       default_dns1, default_dns2;
 734
 735         unsigned long   rl_rate;                        // default throttle rate
 736         int             num_tbfs;                       // number of throttle buckets
 737
 738         char            accounting_dir[128];
 739         int             account_all_origin; // Accouting all origin (LAC data + Remote LNS Data + PPPOE data)
 740         in_addr_t       bind_address;
 741         in_addr_t       peer_address;
 742         int             send_garp;                      // Set to true to garp for vip address on startup
 743
 744         int             dump_speed;
 745         char            plugins[64][MAXPLUGINS];
 746         char            old_plugins[64][MAXPLUGINS];
 747
 748         int             next_tbf;                       // Next HTB id available to use
 749         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 750                                                         // policy for this process.
 751         int             lock_pages;                     // Lock pages into memory.
 752         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 753         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 754         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 755
 756         in_addr_t       cluster_address;                // Multicast address of cluster.
 757                                                         // Send to this address to have everyone hear.
 758         char            cluster_interface[64];          // Which interface to listen for multicast on.
 759         int             cluster_iam_master;             // Are we the cluster master???
 760         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 761         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 762                                                         // Zero if i am the cluster master.
 763         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 764                                                         // (or the seq number we're next expecting if we're a slave).
 765         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 766         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 767         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 768         int             cluster_undefined_groupes;      // How many groupes we're yet to receive from the master.
 769         int             cluster_highest_sessionid;
 770         int             cluster_highest_bundleid;
 771         int             cluster_highest_groupeid;
 772         int             cluster_highest_tunnelid;
 773         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 774         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 775         int             cluster_num_changes;            // Number of changes queued.
 776
 777         int             cluster_mcast_ttl;              // TTL for multicast packets
 778         int             cluster_hb_interval;            // How often to send a heartbeat.
 779         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 780         uint64_t        cluster_table_version;          // # state changes processed by cluster
 781
 782         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 783
 784
 785         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 786                                                         // slaves is less than this value.
 787         in_addr_t       cli_bind_address;               // bind address for CLI
 788         char            hostname[MAXHOSTNAME];  // hostname (overridden by -h on command line)
 789         // Guest change
 790         char            guest_user[MAXUSER];            // Guest account username
 791
 792 #ifdef BGP
 793 #define BGP_NUM_PEERS   2
 794         uint16_t as_number;
 795         struct {
 796                 char name[64];
 797                 uint16_t as;
 798                 int keepalive;
 799                 int hold;
 800                 struct in_addr update_source;
 801         } neighbour[BGP_NUM_PEERS];
 802         in_addr_t       nexthop_address;
 803         struct in6_addr nexthop6_address;
 804 #endif
 805
 806         int echo_timeout; // Time between last packet sent and LCP ECHO generation
 807         int idle_echo_timeout; // Time between last packet seen and
 808                                                    // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
 809         in_addr_t iftun_address;
 810         int disable_lac_func;
 811         int auth_tunnel_change_addr_src;
 812         int highest_rlnsid;
 813         uint16_t bind_portremotelns;
 814         in_addr_t bind_address_remotelns;
 815         char pppoe_if_to_bind[IFNAMSIZ];        // Name pppoe interface to bind
 816         char pppoe_service_name[64];    // pppoe service name
 817         char pppoe_ac_name[64];
 818         uint8_t pppoe_hwaddr[ETH_ALEN]; // MAC addr of interface pppoe to bind
 819         int pppoe_only_equal_svc_name; // Accept only PADI with service-name equal to server
 820         int disable_sending_hello; // Disable l2tp sending HELLO message for Apple compatibility.
 821         int disable_no_spoof; // Disable no spoof (permit load balancing client --> internet)
 822         int nbudpfd; // number UDP file handle
 823         int nbmultiaddress; // number multi address to bind
 824         int indexlacudpfd;      // Index UDP LAC file handle (in udpfd[])
 825         in_addr_t bind_n_address[MAX_BINDADDR];
 826         in_addr_t iftun_n_address[MAX_BINDADDR];
 827         char bind_multi_address[256];
 828         int grp_txrate_average_time; // caculation txrate average time (default 10s)
 829 } configt;
 830
 831 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 832 typedef struct
 833 {
 834         char *key;
 835         int offset;
 836         int size;
 837         enum config_typet type;
 838 } config_descriptt;
 839
 840 typedef struct
 841 {
 842         uint8_t op;     // operation
 843 #define FILTER_PORT_OP_NONE     0 // all ports match
 844 #define FILTER_PORT_OP_EQ       1
 845 #define FILTER_PORT_OP_NEQ      2
 846 #define FILTER_PORT_OP_GT       3
 847 #define FILTER_PORT_OP_LT       4
 848 #define FILTER_PORT_OP_RANGE    5
 849         uint16_t port;  // port (host byte order)
 850         uint16_t port2; // range
 851 } ip_filter_portt;
 852
 853 typedef struct
 854 {
 855         int action;             // permit/deny
 856 #define FILTER_ACTION_DENY      1
 857 #define FILTER_ACTION_PERMIT    2
 858         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 859         in_addr_t src_ip;       // source ip (network byte order)
 860         in_addr_t src_wild;
 861         ip_filter_portt src_ports;
 862         in_addr_t dst_ip;       // dest ip
 863         in_addr_t dst_wild;
 864         ip_filter_portt dst_ports;
 865         uint8_t frag;           // apply to non-initial fragments
 866         uint8_t tcp_flag_op;    // match type: any, all, established
 867 #define FILTER_FLAG_OP_ANY      1
 868 #define FILTER_FLAG_OP_ALL      2
 869 #define FILTER_FLAG_OP_EST      3
 870         uint8_t tcp_sflags;     // flags set
 871         uint8_t tcp_cflags;     // flags clear
 872         uint32_t counter;       // match count
 873 } ip_filter_rulet;
 874
 875 #define TCP_FLAG_FIN    0x01
 876 #define TCP_FLAG_SYN    0x02
 877 #define TCP_FLAG_RST    0x04
 878 #define TCP_FLAG_PSH    0x08
 879 #define TCP_FLAG_ACK    0x10
 880 #define TCP_FLAG_URG    0x20
 881
 882 #define MAXFILTER               32
 883 #define MAXFILTER_RULES         32
 884 typedef struct
 885 {
 886         char name[32];          // ACL name
 887         int extended;           // type: 0 = standard, 1 = extended
 888         ip_filter_rulet rules[MAXFILTER_RULES];
 889         int used;               // session ref count
 890 } ip_filtert;
 891
 892 // CDN result/error codes
 893 #define CDN_NONE                        0, 0
 894 #define CDN_TRY_ANOTHER                 2, 7
 895 #define CDN_ADMIN_DISC                  3, 0
 896 #define CDN_UNAVAILABLE                 4, 0
 897
 898 // RADIUS Acct-Terminate-Cause values
 899 #define TERM_USER_REQUEST               1
 900 #define TERM_LOST_CARRIER               2
 901 #define TERM_LOST_SERVICE               3
 902 #define TERM_IDLE_TIMEOUT               4
 903 #define TERM_SESSION_TIMEOUT            5
 904 #define TERM_ADMIN_RESET                6
 905 #define TERM_ADMIN_REBOOT               7
 906 #define TERM_PORT_ERROR                 8
 907 #define TERM_NAS_ERROR                  9
 908 #define TERM_NAS_REQUEST                10
 909 #define TERM_NAS_REBOOT                 11
 910 #define TERM_PORT_UNNEEDED              12
 911 #define TERM_PORT_PREEMPTED             13
 912 #define TERM_PORT_SUSPENDED             14
 913 #define TERM_SERVICE_UNAVAILABLE        15
 914 #define TERM_CALLBACK                   16
 915 #define TERM_USER_ERROR                 17
 916 #define TERM_HOST_REQUEST               18
 917 #define TERM_SUPPLICANT_RESTART         19
 918 #define TERM_REAUTHENTICATION_FAILURE   20
 919 #define TERM_PORT_REINIT                21
 920 #define TERM_PORT_DISABLED              22
 921
 922 // on slaves, alow BGP to withdraw cleanly before exiting
 923 #define QUIT_DELAY      5
 924
 925 // quit actions (master)
 926 #define QUIT_FAILOVER   1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
 927 #define QUIT_SHUTDOWN   2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
 928
 929 // arp.c
 930 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 931
 932
 933 // ppp.c
 934 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 935 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 936 void lcp_open(sessionidt s, tunnelidt t);
 937 void lcp_restart(sessionidt s);
 938 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 939 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 940 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 941 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 942 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 943 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 944 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 945 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 946 void sendchap(sessionidt s, tunnelidt t);
 947 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);
 948 uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
 949 void sendlcp(sessionidt s, tunnelidt t);
 950 void send_ipin(sessionidt s, uint8_t *buf, int len);
 951 void sendccp(sessionidt s, tunnelidt t);
 952 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 953 int join_bundle(sessionidt s);
 954
 955
 956 // radius.c
 957 void initrad(void);
 958 void radiussend(uint16_t r, uint8_t state);
 959 void processrad(uint8_t *buf, int len, char socket_index);
 960 void radiusretry(uint16_t r);
 961 uint16_t radiusnew(sessionidt s);
 962 void radiusclear(uint16_t r, sessionidt s);
 963 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 964 int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, const char *radiussecret, const uint8_t * auth);
 965
 966 // l2tpns.c
 967 clockt backoff(uint8_t try);
 968 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 969 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 970 sessionidt sessionbyip(in_addr_t ip);
 971 sessionidt sessionbyipv6(struct in6_addr ip);
 972 sessionidt sessionbyuser(char *username);
 973 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 974 void random_data(uint8_t *buf, int len);
 975 void sessionkill(sessionidt s, char *reason);
 976 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 977 void filter_session(sessionidt s, int filter_in, int filter_out);
 978 void send_garp(in_addr_t ip);
 979 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 980 int tun_write(uint8_t *data, int size);
 981 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 982 void sendipcp(sessionidt s, tunnelidt t);
 983 void sendipv6cp(sessionidt s, tunnelidt t);
 984 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd);
 985 void processipout(uint8_t *buf, int len);
 986 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 987 int find_filter(char const *name, size_t len);
 988 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 989 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 990 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 991 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 992 void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
 993 ssize_t netlink_send(struct nlmsghdr *nh);
 994 void cache_ipmap(in_addr_t ip, sessionidt s);
 995
 996 tunnelidt lac_new_tunnel();
 997 void lac_tunnelclear(tunnelidt t);
 998 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len);
 999 void lac_send_ICRQ(tunnelidt t, sessionidt s);
1000 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg);
1001
1002 // grpsess.c
1003 sessionidt grp_getnextsession(groupidt g, in_addr_t ip);
1004 void grp_initdata(void);
1005 void grp_processvendorspecific(sessionidt s, uint8_t *pvs);
1006 groupidt grp_groupbysession(sessionidt s);
1007 groupidt grp_groupbyip(in_addr_t ip);
1008 void grp_setgrouproute(groupidt g, int add);
1009 void grp_time_changed(void);
1010 void grp_removesession(groupidt g, sessionidt s);
1011 int grp_cluster_load_groupe(groupidt g, groupsesst *new);
1012
1013 #undef LOG
1014 #undef LOG_HEX
1015 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
1016 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
1017
1018 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
1019 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
1020
1021
1022 int sessionsetup(sessionidt s, tunnelidt t);
1023 int run_plugins(int plugin_type, void *data);
1024 void rebuild_address_pool(void);
1025 void throttle_session(sessionidt s, int rate_in, int rate_out);
1026 int load_session(sessionidt, sessiont *);
1027 void become_master(void);       // We're the master; kick off any required master initializations.
1028
1029
1030 // cli.c
1031 void init_cli();
1032 void cli_init_complete(char *hostname);
1033 void cli_do_file(FILE *fh);
1034 void cli_do(int sockfd);
1035 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
1036
1037
1038 // icmp.c
1039 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
1040
1041
1042 extern tunnelt *tunnel;
1043 extern bundlet *bundle;
1044 extern sessiont *session;
1045 extern sessionlocalt *sess_local;
1046 extern ippoolt *ip_address_pool;
1047 extern groupsesst *grpsession;
1048 extern groupidt gnextgrpid;
1049 #define sessionfree (session[0].next)
1050
1051
1052 extern configt *config;
1053 extern time_t basetime;         // Time when this process started.
1054 extern time_t time_now;         // Seconds since EPOCH.
1055 extern char main_quit;
1056 extern uint32_t last_id;
1057 extern struct Tstats *_statistics;
1058 extern in_addr_t my_address;
1059 extern int clifd;
1060 extern int epollfd;
1061 extern int tunidx;              // ifr_ifindex of tun device
1062 extern union iphash ip_hash[256];
1063
1064 struct event_data {
1065         enum {
1066                 FD_TYPE_CLI,
1067                 FD_TYPE_CLUSTER,
1068                 FD_TYPE_TUN,
1069                 FD_TYPE_UDP,
1070                 FD_TYPE_CONTROL,
1071                 FD_TYPE_DAE,
1072                 FD_TYPE_RADIUS,
1073                 FD_TYPE_BGP,
1074                 FD_TYPE_NETLINK,
1075                 FD_TYPE_PPPOEDISC,
1076                 FD_TYPE_PPPOESESS
1077         } type;
1078         int index; // for RADIUS, BGP, UDP
1079 };
1080
1081 #define TIME (config->current_time)
1082
1083 extern uint16_t MRU;
1084 extern uint16_t MSS;
1085
1086 // macros for handling help in cli commands
1087 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
1088 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
1089
1090 #endif /* __L2TPNS_H__ */