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 MAXUSER         128             // username
  42 #define MAXPASS         128             // password
  43 #define MAXPLUGINS      20              // maximum number of plugins to load
  44 #define MAXRADSERVER    10              // max radius servers
  45 #define MAXROUTE        10              // max static routes per session
  46 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  47 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  48 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  49 #define ECHO_TIMEOUT    10              // Time between last packet sent and LCP ECHO generation
  50 #define IDLE_TIMEOUT    240             // Time between last packet seen and session shutdown
  51 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  52
  53 #define MP_BEGIN        0x80            // This value is used when (b)egin bit is set in MP header
  54 #define MP_END          0x40            // This value is used when (e)nd bit is set in MP header
  55 #define MP_BOTH_BITS    0xC0            // This value is used when both bits (begin and end) are set in MP header
  56
  57 #define MINFRAGLEN      64              // Minumum fragment length
  58 #define MAXFRAGLEN      750             // Maximum length for Multilink fragment (MTU / 2 sessions)
  59 #define MAXFRAGNUM      128             // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
  60                                         // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
  61 #define MAXFRAGNUM_MASK 127             // Must be equal to MAXFRAGNUM-1
  62
  63 // Constants
  64 #ifndef ETCDIR
  65 #define ETCDIR          "/etc/l2tpns"
  66 #endif
  67
  68 #ifndef LIBDIR
  69 #define LIBDIR          "/usr/lib/l2tpns"
  70 #endif
  71
  72 #ifndef PLUGINDIR
  73 #define PLUGINDIR       LIBDIR          // Plugins
  74 #endif
  75
  76 #ifndef PLUGINCONF
  77 #define PLUGINCONF      ETCDIR          // Plugin config dir
  78 #endif
  79
  80 #ifndef FLASHDIR
  81 #define FLASHDIR        ETCDIR
  82 #endif
  83
  84 #define TUNDEVICE       "/dev/net/tun"
  85 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  86 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  87 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  88 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  89 #define ACCT_TIME       3000                            // 5 minute accounting interval
  90 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  91 #define L2TPPORT        1701                            // L2TP port
  92 #define RADPORT         1645                            // old radius port...
  93 #define DAEPORT         3799                            // DAE port
  94 #define PKTARP          0x0806                          // ARP packet type
  95 #define PKTIP           0x0800                          // IPv4 packet type
  96 #define PKTIPV6         0x86DD                          // IPv6 packet type
  97 #define PPPPAP          0xC023
  98 #define PPPCHAP         0xC223
  99 #define PPPLCP          0xC021
 100 #define PPPIPCP         0x8021
 101 #define PPPIPV6CP       0x8057
 102 #define PPPCCP          0x80FD
 103 #define PPPIP           0x0021
 104 #define PPPIPV6         0x0057
 105 #define PPPMP           0x003D
 106 #define MIN_IP_SIZE     0x19
 107
 108 enum {
 109         ConfigReq = 1,
 110         ConfigAck,
 111         ConfigNak,
 112         ConfigRej,
 113         TerminateReq,
 114         TerminateAck,
 115         CodeRej,
 116         ProtocolRej,
 117         EchoReq,
 118         EchoReply,
 119         DiscardRequest,
 120         IdentRequest
 121 };
 122
 123 enum {
 124         AccessRequest = 1,
 125         AccessAccept,
 126         AccessReject,
 127         AccountingRequest,
 128         AccountingResponse,
 129         AccessChallenge = 11,
 130         DisconnectRequest = 40,
 131         DisconnectACK,
 132         DisconnectNAK,
 133         CoARequest,
 134         CoAACK,
 135         CoANAK
 136 };
 137
 138 // PPP phases
 139 enum {
 140         Dead,
 141         Establish,
 142         Authenticate,
 143         Network,
 144         Terminate
 145 };
 146
 147 // PPP states
 148 enum {
 149         Initial,
 150         Starting,
 151         Closed,
 152         Stopped,
 153         Closing,
 154         Stopping,
 155         RequestSent,
 156         AckReceived,
 157         AckSent,
 158         Opened
 159 };
 160
 161 // reset state machine counters
 162 #define initialise_restart_count(_s, _fsm)                      \
 163         sess_local[_s]._fsm.conf_sent =                         \
 164         sess_local[_s]._fsm.nak_sent = 0
 165
 166 // no more attempts
 167 #define zero_restart_count(_s, _fsm) ({                         \
 168         sess_local[_s]._fsm.conf_sent =                         \
 169                 config->ppp_max_configure;                      \
 170         sess_local[_s]._fsm.restart =                           \
 171                 time_now + config->ppp_restart_time;            \
 172 })
 173
 174 // increment ConfReq counter and reset timer
 175 #define restart_timer(_s, _fsm) ({                              \
 176         sess_local[_s]._fsm.conf_sent++;                        \
 177         sess_local[_s]._fsm.restart =                           \
 178                 time_now + config->ppp_restart_time;            \
 179 })
 180
 181 // stop timer on change to state where timer does not run
 182 #define change_state(_s, _fsm, _new) ({                         \
 183         if (_new != session[_s].ppp._fsm)                       \
 184         {                                                       \
 185                 switch (_new)                                   \
 186                 {                                               \
 187                 case Initial:                                   \
 188                 case Starting:                                  \
 189                 case Closed:                                    \
 190                 case Stopped:                                   \
 191                 case Opened:                                    \
 192                         sess_local[_s]._fsm.restart = 0;        \
 193                         initialise_restart_count(_s, _fsm);     \
 194                 }                                               \
 195                 session[_s].ppp._fsm = _new;                    \
 196                 cluster_send_session(_s);                       \
 197         }                                                       \
 198 })
 199
 200 // Types
 201 typedef uint16_t sessionidt;
 202 typedef uint16_t bundleidt;
 203 typedef uint16_t tunnelidt;
 204 typedef uint32_t clockt;
 205 typedef uint8_t hasht[16];
 206
 207 // CLI actions
 208 struct cli_session_actions {
 209         char action;
 210         in_addr_t snoop_ip;
 211         uint16_t snoop_port;
 212         int throttle_in;
 213         int throttle_out;
 214         int filter_in;
 215         int filter_out;
 216 };
 217
 218 #define CLI_SESS_KILL           0x01
 219 #define CLI_SESS_SNOOP          0x02
 220 #define CLI_SESS_NOSNOOP        0x04
 221 #define CLI_SESS_THROTTLE       0x08
 222 #define CLI_SESS_NOTHROTTLE     0x10
 223 #define CLI_SESS_FILTER         0x20
 224 #define CLI_SESS_NOFILTER       0x40
 225
 226 struct cli_tunnel_actions {
 227         char action;
 228 };
 229
 230 #define CLI_TUN_KILL            0x01
 231
 232 // structures
 233 typedef struct                  // route
 234 {
 235         in_addr_t ip;
 236         in_addr_t mask;
 237 }
 238 routet;
 239
 240 typedef struct controls         // control message
 241 {
 242         struct controls *next;  // next in queue
 243         uint16_t length;        // length
 244         uint8_t buf[MAXCONTROL];
 245 }
 246 controlt;
 247
 248 typedef struct {
 249         uint8_t length;                 // Endpoint Discriminator length
 250         uint8_t addr_class;             // Endpoint Discriminator class
 251         uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
 252 } epdist;
 253
 254 typedef struct {
 255         sessionidt sid;                 // Fragment originating session
 256         uint8_t flags;                  // MP frame flags
 257         uint32_t seq;                   // fragment seq num
 258         uint16_t length;                // Fragment length
 259         uint8_t data[MAXFRAGLEN];       // Fragment data
 260 } fragmentt;
 261
 262 typedef struct
 263 {
 264         sessionidt next;                // next session in linked list
 265         sessionidt far;                 // far end session ID
 266         tunnelidt tunnel;               // near end tunnel ID
 267         uint8_t flags;                  // session flags: see SESSION_*
 268         struct {
 269                 uint8_t phase;          // PPP phase
 270                 uint8_t lcp:4;          //   LCP    state
 271                 uint8_t ipcp:4;         //   IPCP   state
 272                 uint8_t ipv6cp:4;       //   IPV6CP state
 273                 uint8_t ccp:4;          //   CCP    state
 274         } ppp;
 275         char reserved_1[2];             // unused: padding
 276         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 277         int ip_pool_index;              // index to IP pool
 278         uint32_t unique_id;             // unique session id
 279         char reserved_2[4];             // unused: was ns/nr
 280         uint32_t magic;                 // ppp magic number
 281         uint32_t pin, pout;             // packet counts
 282         uint32_t cin, cout;             // byte counts
 283         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 284         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 285         uint16_t throttle_in;           // upstream throttle rate (kbps)
 286         uint16_t throttle_out;          // downstream throttle rate
 287         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 288         uint8_t filter_out;             // output filter index
 289         uint16_t mru;                   // maximum receive unit
 290         clockt opened;                  // when started
 291         clockt die;                     // being closed, when to finally free
 292         uint32_t session_timeout;       // Maximum session time in seconds
 293         uint32_t idle_timeout;          // Maximum idle time in seconds
 294         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 295         time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
 296         in_addr_t dns1, dns2;           // DNS servers
 297         routet route[MAXROUTE];         // static routes
 298         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 299         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 300         int random_vector_length;
 301         uint8_t random_vector[MAXTEL];
 302         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 303         char called[MAXTEL];            // called number
 304         char calling[MAXTEL];           // calling number
 305         uint32_t tx_connect_speed;
 306         uint32_t rx_connect_speed;
 307         clockt timeout;                 // Session timeout
 308         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 309         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 310         epdist epdis;                   // Multilink Endpoint Discriminator
 311         bundleidt bundle;               // Multilink Bundle Identifier
 312         in_addr_t snoop_ip;             // Interception destination IP
 313         uint16_t snoop_port;            // Interception destination port
 314         uint8_t walled_garden;          // is this session gardened?
 315         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 316         struct in6_addr ipv6route;      // Static IPv6 route
 317         char reserved_3[11];            // Space to expand structure without changing HB_VERSION
 318 }
 319 sessiont;
 320
 321 typedef struct
 322 {
 323         int state;                              // current state (bundlestate enum)
 324         uint32_t seq_num_t;                     // Sequence Number (transmission)
 325         uint32_t timeout;                       // Session-Timeout for bundle
 326         uint32_t max_seq;                       // Max value of sequence number field
 327         uint8_t num_of_links;                   // Number of links joint to this bundle
 328         uint32_t online_time;                   // The time this bundle is online
 329         clockt last_check;                      // Last time the timeout is checked
 330         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 331         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 332         epdist epdis;                           // Multilink Endpoint Discriminator
 333         char user[MAXUSER];                     // Needed for matching member links
 334         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 335         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 336 }
 337 bundlet;
 338
 339 typedef struct
 340 {
 341         fragmentt fragment[MAXFRAGNUM];
 342         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 343         uint16_t re_frame_len;                  // The reassembled frame length
 344         uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
 345         uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
 346         uint32_t M;                             // Minumum frame sequence number received over all bundle members
 347         uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
 348 }
 349 fragmentationt;
 350
 351 #define AUTHPAP         1       // allow PAP
 352 #define AUTHCHAP        2       // allow CHAP
 353
 354 typedef struct
 355 {
 356         // packet counters
 357         uint32_t pin;
 358         uint32_t pout;
 359
 360         // byte counters
 361         uint32_t cin;
 362         uint32_t cout;
 363
 364         // PPP restart timer/counters
 365         struct {
 366                 time_t restart;
 367                 int conf_sent;
 368                 int nak_sent;
 369         } lcp, ipcp, ipv6cp, ccp;
 370
 371         // identifier for Protocol-Reject, Code-Reject
 372         uint8_t lcp_ident;
 373
 374         // authentication to use
 375         int lcp_authtype;
 376
 377         // our MRU
 378         uint16_t ppp_mru;
 379
 380         // our MRRU
 381         uint16_t mp_mrru;
 382
 383         // our mssf
 384         uint16_t mp_mssf;
 385
 386         // our Endpoint Discriminator
 387         in_addr_t mp_epdis;
 388
 389         // DoS prevention
 390         clockt last_packet_out;
 391         uint32_t packets_out;
 392         uint32_t packets_dropped;
 393
 394         // RADIUS session in use
 395         uint16_t radius;
 396
 397         // interim RADIUS
 398         time_t last_interim;
 399
 400         // last LCP Echo
 401         time_t last_echo;
 402
 403         // Last Multilink frame sequence number received
 404         uint32_t last_seq;
 405 } sessionlocalt;
 406
 407 // session flags
 408 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 409 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 410 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 411
 412 // 168 bytes per tunnel
 413 typedef struct
 414 {
 415         tunnelidt far;          // far end tunnel ID
 416         in_addr_t ip;           // Ip for far end
 417         uint16_t port;          // port for far end
 418         uint16_t window;        // Rx window
 419         uint16_t nr;            // next receive
 420         uint16_t ns;            // next send
 421         int state;              // current state (tunnelstate enum)
 422         clockt last;            // when last control message sent (used for resend timeout)
 423         clockt retry;           // when to try resending pending control
 424         clockt die;             // being closed, when to finally free
 425         clockt lastrec;         // when the last control message was received
 426         char hostname[128];     // tunnel hostname
 427         char vendor[128];       // LAC vendor
 428         uint8_t try;            // number of retrys on a control message
 429         uint16_t controlc;      // outstaind messages in queue
 430         controlt *controls;     // oldest message
 431         controlt *controle;     // newest message
 432 }
 433 tunnelt;
 434
 435 // 164 bytes per radius session
 436 typedef struct                  // outstanding RADIUS requests
 437 {
 438         sessionidt session;     // which session this applies to
 439         hasht auth;             // request authenticator
 440         clockt retry;           // when to try next
 441         char pass[129];         // password
 442         uint8_t id;             // ID for PPP response
 443         uint8_t try;            // which try we are on
 444         uint8_t state;          // state of radius requests
 445         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 446         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 447         char const *term_msg;   //   terminate reason
 448 }
 449 radiust;
 450
 451 typedef struct
 452 {
 453         in_addr_t       address;        // Host byte order..
 454         char            assigned;       // 1 if assigned, 0 if free
 455         sessionidt      session;
 456         clockt          last;           // last used
 457         char            user[129];      // user (try to have ip addresses persistent)
 458 }
 459 ippoolt;
 460
 461 #ifdef RINGBUFFER
 462 struct Tringbuffer
 463 {
 464         struct {
 465                 char level;
 466                 sessionidt session;
 467                 tunnelidt tunnel;
 468                 char message[MAX_LOG_LENGTH];
 469         } buffer[RINGBUFFER_SIZE];
 470         int head;
 471         int tail;
 472 };
 473 #endif
 474
 475 /*
 476  * Possible tunnel states
 477  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 478  */
 479 enum
 480 {
 481         TUNNELFREE,             // Not in use
 482         TUNNELOPEN,             // Active tunnel
 483         TUNNELDIE,              // Currently closing
 484         TUNNELOPENING,          // Busy opening
 485         TUNNELUNDEF,            // Undefined
 486 };
 487
 488 enum
 489 {
 490         BUNDLEFREE,             // Not in use
 491         BUNDLEOPEN,             // Active bundle
 492         BUNDLEUNDEF,            // Undefined
 493 };
 494
 495 enum
 496 {
 497         NULLCLASS = 0,          //End Point Discriminator classes
 498         LOCALADDR,
 499         IPADDR,
 500         IEEEMACADDR,
 501         PPPMAGIC,
 502         PSNDN,
 503 };
 504
 505 enum
 506 {
 507         RADIUSNULL,             // Not in use
 508         RADIUSCHAP,             // sending CHAP down PPP
 509         RADIUSAUTH,             // sending auth to RADIUS server
 510         RADIUSSTART,            // sending start accounting to RADIUS server
 511         RADIUSSTOP,             // sending stop accounting to RADIUS server
 512         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 513         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 514         RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning
 515 };
 516
 517 struct Tstats
 518 {
 519     time_t      start_time;
 520     time_t      last_reset;
 521
 522     uint32_t    tun_rx_packets;
 523     uint32_t    tun_tx_packets;
 524     uint32_t    tun_rx_bytes;
 525     uint32_t    tun_tx_bytes;
 526     uint32_t    tun_rx_errors;
 527     uint32_t    tun_tx_errors;
 528     uint32_t    tun_rx_dropped;
 529
 530     uint32_t    tunnel_rx_packets;
 531     uint32_t    tunnel_tx_packets;
 532     uint32_t    tunnel_rx_bytes;
 533     uint32_t    tunnel_tx_bytes;
 534     uint32_t    tunnel_rx_errors;
 535     uint32_t    tunnel_tx_errors;
 536
 537     uint32_t    tunnel_retries;
 538     uint32_t    radius_retries;
 539
 540     uint32_t    arp_sent;
 541
 542     uint32_t    packets_snooped;
 543
 544     uint32_t    tunnel_created;
 545     uint32_t    session_created;
 546     uint32_t    tunnel_timeout;
 547     uint32_t    session_timeout;
 548     uint32_t    radius_timeout;
 549     uint32_t    radius_overflow;
 550     uint32_t    tunnel_overflow;
 551     uint32_t    session_overflow;
 552
 553     uint32_t    ip_allocated;
 554     uint32_t    ip_freed;
 555
 556     uint32_t    c_forwarded;
 557     uint32_t    recv_forward;
 558
 559     uint32_t    select_called;
 560     uint32_t    multi_read_used;
 561     uint32_t    multi_read_exceeded;
 562
 563 #ifdef STATISTICS
 564     uint32_t    call_processtun;
 565     uint32_t    call_processipout;
 566     uint32_t    call_processipv6out;
 567     uint32_t    call_processudp;
 568     uint32_t    call_sessionbyip;
 569     uint32_t    call_sessionbyipv6;
 570     uint32_t    call_sessionbyuser;
 571     uint32_t    call_sendarp;
 572     uint32_t    call_sendipcp;
 573     uint32_t    call_sendipv6cp;
 574     uint32_t    call_processipv6cp;
 575     uint32_t    call_tunnelsend;
 576     uint32_t    call_sessionkill;
 577     uint32_t    call_sessionshutdown;
 578     uint32_t    call_tunnelkill;
 579     uint32_t    call_tunnelshutdown;
 580     uint32_t    call_assign_ip_address;
 581     uint32_t    call_free_ip_address;
 582     uint32_t    call_dump_acct_info;
 583     uint32_t    call_sessionsetup;
 584     uint32_t    call_processpap;
 585     uint32_t    call_processchap;
 586     uint32_t    call_processlcp;
 587     uint32_t    call_processipcp;
 588     uint32_t    call_processipin;
 589     uint32_t    call_processipv6in;
 590     uint32_t    call_processccp;
 591     uint32_t    call_sendchap;
 592     uint32_t    call_processrad;
 593     uint32_t    call_radiussend;
 594     uint32_t    call_radiusretry;
 595     uint32_t    call_random_data;
 596 #endif
 597 };
 598
 599 #ifdef STATISTICS
 600
 601 #ifdef STAT_CALLS
 602 #define CSTAT(x)        STAT(call_ ## x)
 603 #else
 604 #define CSTAT(x)
 605 #endif
 606
 607 #define STAT(x)         (_statistics->x++)
 608 #define INC_STAT(x,y)   (_statistics->x += (y))
 609 #define GET_STAT(x)     (_statistics->x)
 610 #define SET_STAT(x, y)  (_statistics->x = (y))
 611 #else
 612 #define CSTAT(x)
 613 #define STAT(x)
 614 #define INC_STAT(x,y)
 615 #define GET_STAT(x)     0
 616 #define SET_STAT(x, y)
 617 #endif
 618
 619 typedef struct
 620 {
 621         int             debug;                          // debugging level
 622         time_t          start_time;                     // time when l2tpns was started
 623         char            bandwidth[256];                 // current bandwidth
 624         char            pid_file[256];                  // file to write PID to on startup
 625         int             wrote_pid;
 626         clockt          current_time;                   // 1/10ths of a second since the process started.
 627                                                         // means that we can only run a given process
 628                                                         // for 13 years without re-starting!
 629
 630         char            config_file[128];
 631         int             reload_config;                  // flag to re-read config (set by cli)
 632         int             multi_read_count;               // amount of packets to read per fd in processing loop
 633
 634         char            tundevice[10];                  // tun device name
 635         char            log_filename[128];
 636
 637         char            l2tp_secret[64];                // L2TP shared secret
 638         int             l2tp_mtu;                       // MTU of interface used for L2TP
 639
 640         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 641
 642         int             ppp_restart_time;               // timeout for PPP restart
 643         int             ppp_max_configure;              // max lcp configure requests to send
 644         int             ppp_max_failure;                // max lcp configure naks to send
 645
 646         char            radiussecret[64];
 647         int             radius_accounting;
 648         int             radius_interim;
 649         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 650         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 651         uint8_t         numradiusservers;               // radius server count
 652
 653         uint16_t        radius_dae_port;                // port for radius DAE
 654         uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
 655         uint16_t        radius_bind_max;
 656
 657         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 658         int             radius_authtypes;
 659         int             radius_authprefer;
 660
 661         int             allow_duplicate_users;          // allow multiple logins with the same username
 662         int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
 663
 664         in_addr_t       default_dns1, default_dns2;
 665
 666         unsigned long   rl_rate;                        // default throttle rate
 667         int             num_tbfs;                       // number of throttle buckets
 668
 669         char            accounting_dir[128];
 670         in_addr_t       bind_address;
 671         in_addr_t       peer_address;
 672         int             send_garp;                      // Set to true to garp for vip address on startup
 673
 674         int             dump_speed;
 675         char            plugins[64][MAXPLUGINS];
 676         char            old_plugins[64][MAXPLUGINS];
 677
 678         int             next_tbf;                       // Next HTB id available to use
 679         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 680                                                         // policy for this process.
 681         int             lock_pages;                     // Lock pages into memory.
 682         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 683         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 684         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 685
 686         in_addr_t       cluster_address;                // Multicast address of cluster.
 687                                                         // Send to this address to have everyone hear.
 688         char            cluster_interface[64];          // Which interface to listen for multicast on.
 689         int             cluster_iam_master;             // Are we the cluster master???
 690         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 691         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 692                                                         // Zero if i am the cluster master.
 693         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 694                                                         // (or the seq number we're next expecting if we're a slave).
 695         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 696         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 697         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 698         int             cluster_highest_sessionid;
 699         int             cluster_highest_bundleid;
 700         int             cluster_highest_tunnelid;
 701         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 702         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 703         int             cluster_num_changes;            // Number of changes queued.
 704
 705         int             cluster_mcast_ttl;              // TTL for multicast packets
 706         int             cluster_hb_interval;            // How often to send a heartbeat.
 707         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 708         uint64_t        cluster_table_version;          // # state changes processed by cluster
 709
 710         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 711
 712
 713         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 714                                                         // slaves is less than this value.
 715         // Guest change
 716         char            guest_user[MAXUSER];            // Guest account username
 717
 718 #ifdef BGP
 719 #define BGP_NUM_PEERS   2
 720         uint16_t as_number;
 721         struct {
 722                 char name[64];
 723                 uint16_t as;
 724                 int keepalive;
 725                 int hold;
 726         } neighbour[BGP_NUM_PEERS];
 727 #endif
 728 } configt;
 729
 730 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 731 typedef struct
 732 {
 733         char *key;
 734         int offset;
 735         int size;
 736         enum config_typet type;
 737 } config_descriptt;
 738
 739 typedef struct
 740 {
 741         uint8_t op;     // operation
 742 #define FILTER_PORT_OP_NONE     0 // all ports match
 743 #define FILTER_PORT_OP_EQ       1
 744 #define FILTER_PORT_OP_NEQ      2
 745 #define FILTER_PORT_OP_GT       3
 746 #define FILTER_PORT_OP_LT       4
 747 #define FILTER_PORT_OP_RANGE    5
 748         uint16_t port;  // port (host byte order)
 749         uint16_t port2; // range
 750 } ip_filter_portt;
 751
 752 typedef struct
 753 {
 754         int action;             // permit/deny
 755 #define FILTER_ACTION_DENY      1
 756 #define FILTER_ACTION_PERMIT    2
 757         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 758         in_addr_t src_ip;       // source ip (network byte order)
 759         in_addr_t src_wild;
 760         ip_filter_portt src_ports;
 761         in_addr_t dst_ip;       // dest ip
 762         in_addr_t dst_wild;
 763         ip_filter_portt dst_ports;
 764         uint8_t frag;           // apply to non-initial fragments
 765         uint8_t tcp_flag_op;    // match type: any, all, established
 766 #define FILTER_FLAG_OP_ANY      1
 767 #define FILTER_FLAG_OP_ALL      2
 768 #define FILTER_FLAG_OP_EST      3
 769         uint8_t tcp_sflags;     // flags set
 770         uint8_t tcp_cflags;     // flags clear
 771         uint32_t counter;       // match count
 772 } ip_filter_rulet;
 773
 774 #define TCP_FLAG_FIN    0x01
 775 #define TCP_FLAG_SYN    0x02
 776 #define TCP_FLAG_RST    0x04
 777 #define TCP_FLAG_PSH    0x08
 778 #define TCP_FLAG_ACK    0x10
 779 #define TCP_FLAG_URG    0x20
 780
 781 #define MAXFILTER               32
 782 #define MAXFILTER_RULES         32
 783 typedef struct
 784 {
 785         char name[32];          // ACL name
 786         int extended;           // type: 0 = standard, 1 = extended
 787         ip_filter_rulet rules[MAXFILTER_RULES];
 788         int used;               // session ref count
 789 } ip_filtert;
 790
 791 // CDN result/error codes
 792 #define CDN_NONE                        0, 0
 793 #define CDN_TRY_ANOTHER                 2, 7
 794 #define CDN_ADMIN_DISC                  3, 0
 795 #define CDN_UNAVAILABLE                 4, 0
 796
 797 // RADIUS Acct-Terminate-Cause values
 798 #define TERM_USER_REQUEST               1
 799 #define TERM_LOST_CARRIER               2
 800 #define TERM_LOST_SERVICE               3
 801 #define TERM_IDLE_TIMEOUT               4
 802 #define TERM_SESSION_TIMEOUT            5
 803 #define TERM_ADMIN_RESET                6
 804 #define TERM_ADMIN_REBOOT               7
 805 #define TERM_PORT_ERROR                 8
 806 #define TERM_NAS_ERROR                  9
 807 #define TERM_NAS_REQUEST                10
 808 #define TERM_NAS_REBOOT                 11
 809 #define TERM_PORT_UNNEEDED              12
 810 #define TERM_PORT_PREEMPTED             13
 811 #define TERM_PORT_SUSPENDED             14
 812 #define TERM_SERVICE_UNAVAILABLE        15
 813 #define TERM_CALLBACK                   16
 814 #define TERM_USER_ERROR                 17
 815 #define TERM_HOST_REQUEST               18
 816 #define TERM_SUPPLICANT_RESTART         19
 817 #define TERM_REAUTHENTICATION_FAILURE   20
 818 #define TERM_PORT_REINIT                21
 819 #define TERM_PORT_DISABLED              22
 820
 821 // arp.c
 822 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 823
 824
 825 // ppp.c
 826 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 827 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 828 void lcp_open(sessionidt s, tunnelidt t);
 829 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 830 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 831 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 832 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 833 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 834 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 835 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 836 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 837 void sendchap(sessionidt s, tunnelidt t);
 838 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);
 839 void sendlcp(sessionidt s, tunnelidt t);
 840 void send_ipin(sessionidt s, uint8_t *buf, int len);
 841 void sendccp(sessionidt s, tunnelidt t);
 842 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 843 int join_bundle(sessionidt s);
 844
 845
 846 // radius.c
 847 void initrad(void);
 848 void radiussend(uint16_t r, uint8_t state);
 849 void processrad(uint8_t *buf, int len, char socket_index);
 850 void radiusretry(uint16_t r);
 851 uint16_t radiusnew(sessionidt s);
 852 void radiusclear(uint16_t r, sessionidt s);
 853 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 854
 855
 856 // l2tpns.c
 857 clockt backoff(uint8_t try);
 858 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 859 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 860 sessionidt sessionbyip(in_addr_t ip);
 861 sessionidt sessionbyipv6(struct in6_addr ip);
 862 sessionidt sessionbyuser(char *username);
 863 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 864 void random_data(uint8_t *buf, int len);
 865 void sessionkill(sessionidt s, char *reason);
 866 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 867 void filter_session(sessionidt s, int filter_in, int filter_out);
 868 void send_garp(in_addr_t ip);
 869 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 870 int tun_write(uint8_t *data, int size);
 871 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 872 void sendipcp(sessionidt s, tunnelidt t);
 873 void sendipv6cp(sessionidt s, tunnelidt t);
 874 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 875 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 876 int find_filter(char const *name, size_t len);
 877 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 878 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 879 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 880 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 881
 882 #undef LOG
 883 #undef LOG_HEX
 884 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 885 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 886
 887 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 888 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 889
 890
 891 int sessionsetup(sessionidt s, tunnelidt t);
 892 int run_plugins(int plugin_type, void *data);
 893 void rebuild_address_pool(void);
 894 void throttle_session(sessionidt s, int rate_in, int rate_out);
 895 int load_session(sessionidt, sessiont *);
 896 void become_master(void);       // We're the master; kick off any required master initializations.
 897
 898
 899 // cli.c
 900 void init_cli(char *hostname);
 901 void cli_do_file(FILE *fh);
 902 void cli_do(int sockfd);
 903 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 904
 905
 906 // icmp.c
 907 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 908
 909
 910 extern tunnelt *tunnel;
 911 extern bundlet *bundle;
 912 extern sessiont *session;
 913 extern sessionlocalt *sess_local;
 914 extern ippoolt *ip_address_pool;
 915 #define sessionfree (session[0].next)
 916
 917
 918 extern configt *config;
 919 extern time_t basetime;         // Time when this process started.
 920 extern time_t time_now;         // Seconds since EPOCH.
 921 extern char main_quit;
 922 extern uint32_t last_id;
 923 extern struct Tstats *_statistics;
 924 extern in_addr_t my_address;
 925 extern int clifd;
 926 extern int epollfd;
 927
 928 struct event_data {
 929         enum {
 930                 FD_TYPE_CLI,
 931                 FD_TYPE_CLUSTER,
 932                 FD_TYPE_TUN,
 933                 FD_TYPE_UDP,
 934                 FD_TYPE_CONTROL,
 935                 FD_TYPE_DAE,
 936                 FD_TYPE_RADIUS,
 937                 FD_TYPE_BGP,
 938         } type;
 939         int index; // for RADIUS, BGP
 940 };
 941
 942 #define TIME (config->current_time)
 943
 944 extern uint16_t MRU;
 945 extern uint16_t MSS;
 946
 947 // macros for handling help in cli commands
 948 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 949 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 950
 951 #endif /* __L2TPNS_H__ */