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 "2.2.0"
  18
  19 // Limits
  20 #define MAXTUNNEL       500             // could be up to 65535
  21 #define MAXBUNDLE       300             // could be up to 65535
  22 #define MAXBUNDLESES    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 MAXPLUGINS      20              // maximum number of plugins to load
  45 #define MAXRADSERVER    10              // max radius servers
  46 #define MAXROUTE        10              // max static routes per session
  47 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  48 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  49 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  50 #define ECHO_TIMEOUT    10              // Time between last packet sent and LCP ECHO generation
  51 #define IDLE_TIMEOUT    240             // Time between last packet seen and session shutdown
  52 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  53
  54 #define MP_BEGIN        0x80            // This value is used when (b)egin bit is set in MP header
  55 #define MP_END          0x40            // This value is used when (e)nd bit is set in MP header
  56 #define MP_BOTH_BITS    0xC0            // This value is used when both bits (begin and end) are set in MP header
  57
  58 #define MINFRAGLEN      64              // Minumum fragment length
  59 #define MAXFRAGLEN      750             // Maximum length for Multilink fragment (MTU / 2 sessions)
  60 #define MAXFRAGNUM      128             // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
  61                                         // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
  62 #define MAXFRAGNUM_MASK 127             // Must be equal to MAXFRAGNUM-1
  63
  64 // Constants
  65 #ifndef ETCDIR
  66 #define ETCDIR          "/etc/l2tpns"
  67 #endif
  68
  69 #ifndef LIBDIR
  70 #define LIBDIR          "/usr/lib/l2tpns"
  71 #endif
  72
  73 #ifndef PLUGINDIR
  74 #define PLUGINDIR       LIBDIR          // Plugins
  75 #endif
  76
  77 #ifndef PLUGINCONF
  78 #define PLUGINCONF      ETCDIR          // Plugin config dir
  79 #endif
  80
  81 #ifndef FLASHDIR
  82 #define FLASHDIR        ETCDIR
  83 #endif
  84
  85 #define TUNDEVICE       "/dev/net/tun"
  86 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  87 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  88 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  89 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  90 #define ACCT_TIME       3000                            // 5 minute accounting interval
  91 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  92 #define L2TPPORT        1701                            // L2TP port
  93 #define RADPORT         1645                            // old radius port...
  94 #define DAEPORT         3799                            // DAE port
  95 #define PKTARP          0x0806                          // ARP packet type
  96 #define PKTIP           0x0800                          // IPv4 packet type
  97 #define PKTIPV6         0x86DD                          // IPv6 packet type
  98 #define PPPPAP          0xC023
  99 #define PPPCHAP         0xC223
 100 #define PPPLCP          0xC021
 101 #define PPPIPCP         0x8021
 102 #define PPPIPV6CP       0x8057
 103 #define PPPCCP          0x80FD
 104 #define PPPIP           0x0021
 105 #define PPPIPV6         0x0057
 106 #define PPPMP           0x003D
 107 #define MIN_IP_SIZE     0x19
 108
 109 enum {
 110         ConfigReq = 1,
 111         ConfigAck,
 112         ConfigNak,
 113         ConfigRej,
 114         TerminateReq,
 115         TerminateAck,
 116         CodeRej,
 117         ProtocolRej,
 118         EchoReq,
 119         EchoReply,
 120         DiscardRequest,
 121         IdentRequest
 122 };
 123
 124 enum {
 125         AccessRequest = 1,
 126         AccessAccept,
 127         AccessReject,
 128         AccountingRequest,
 129         AccountingResponse,
 130         AccessChallenge = 11,
 131         DisconnectRequest = 40,
 132         DisconnectACK,
 133         DisconnectNAK,
 134         CoARequest,
 135         CoAACK,
 136         CoANAK
 137 };
 138
 139 // PPP phases
 140 enum {
 141         Dead,
 142         Establish,
 143         Authenticate,
 144         Network,
 145         Terminate
 146 };
 147
 148 // PPP states
 149 enum {
 150         Initial,
 151         Starting,
 152         Closed,
 153         Stopped,
 154         Closing,
 155         Stopping,
 156         RequestSent,
 157         AckReceived,
 158         AckSent,
 159         Opened
 160 };
 161
 162 // reset state machine counters
 163 #define initialise_restart_count(_s, _fsm)                      \
 164         sess_local[_s]._fsm.conf_sent =                         \
 165         sess_local[_s]._fsm.nak_sent = 0
 166
 167 // no more attempts
 168 #define zero_restart_count(_s, _fsm) ({                         \
 169         sess_local[_s]._fsm.conf_sent =                         \
 170                 config->ppp_max_configure;                      \
 171         sess_local[_s]._fsm.restart =                           \
 172                 time_now + config->ppp_restart_time;            \
 173 })
 174
 175 // increment ConfReq counter and reset timer
 176 #define restart_timer(_s, _fsm) ({                              \
 177         sess_local[_s]._fsm.conf_sent++;                        \
 178         sess_local[_s]._fsm.restart =                           \
 179                 time_now + config->ppp_restart_time;            \
 180 })
 181
 182 // stop timer on change to state where timer does not run
 183 #define change_state(_s, _fsm, _new) ({                         \
 184         if (_new != session[_s].ppp._fsm)                       \
 185         {                                                       \
 186                 switch (_new)                                   \
 187                 {                                               \
 188                 case Initial:                                   \
 189                 case Starting:                                  \
 190                 case Closed:                                    \
 191                 case Stopped:                                   \
 192                 case Opened:                                    \
 193                         sess_local[_s]._fsm.restart = 0;        \
 194                         initialise_restart_count(_s, _fsm);     \
 195                 }                                               \
 196                 session[_s].ppp._fsm = _new;                    \
 197                 cluster_send_session(_s);                       \
 198         }                                                       \
 199 })
 200
 201 // Types
 202 typedef uint16_t sessionidt;
 203 typedef uint16_t bundleidt;
 204 typedef uint16_t tunnelidt;
 205 typedef uint32_t clockt;
 206 typedef uint8_t hasht[16];
 207
 208 // CLI actions
 209 struct cli_session_actions {
 210         char action;
 211         in_addr_t snoop_ip;
 212         uint16_t snoop_port;
 213         int throttle_in;
 214         int throttle_out;
 215         int filter_in;
 216         int filter_out;
 217 };
 218
 219 #define CLI_SESS_KILL           0x01
 220 #define CLI_SESS_SNOOP          0x02
 221 #define CLI_SESS_NOSNOOP        0x04
 222 #define CLI_SESS_THROTTLE       0x08
 223 #define CLI_SESS_NOTHROTTLE     0x10
 224 #define CLI_SESS_FILTER         0x20
 225 #define CLI_SESS_NOFILTER       0x40
 226
 227 struct cli_tunnel_actions {
 228         char action;
 229 };
 230
 231 #define CLI_TUN_KILL            0x01
 232
 233 // structures
 234 typedef struct                  // route
 235 {
 236         in_addr_t ip;
 237         int prefixlen;
 238 }
 239 routet;
 240
 241 typedef struct controls         // control message
 242 {
 243         struct controls *next;  // next in queue
 244         uint16_t length;        // length
 245         uint8_t buf[MAXCONTROL];
 246 }
 247 controlt;
 248
 249 typedef struct {
 250         uint8_t length;                 // Endpoint Discriminator length
 251         uint8_t addr_class;             // Endpoint Discriminator class
 252         uint8_t address[MAXADDRESS];    // Endpoint Discriminator address
 253 } epdist;
 254
 255 typedef struct {
 256         sessionidt sid;                 // Fragment originating session
 257         uint8_t flags;                  // MP frame flags
 258         uint32_t seq;                   // fragment seq num
 259         uint16_t length;                // Fragment length
 260         uint8_t data[MAXFRAGLEN];       // Fragment data
 261 } fragmentt;
 262
 263 typedef struct
 264 {
 265         sessionidt next;                // next session in linked list
 266         sessionidt far;                 // far end session ID
 267         tunnelidt tunnel;               // near end tunnel ID
 268         uint8_t flags;                  // session flags: see SESSION_*
 269         struct {
 270                 uint8_t phase;          // PPP phase
 271                 uint8_t lcp:4;          //   LCP    state
 272                 uint8_t ipcp:4;         //   IPCP   state
 273                 uint8_t ipv6cp:4;       //   IPV6CP state
 274                 uint8_t ccp:4;          //   CCP    state
 275         } ppp;
 276         char reserved_1[2];             // unused: padding
 277         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 278         int ip_pool_index;              // index to IP pool
 279         uint32_t unique_id;             // unique session id
 280         char reserved_2[4];             // unused: was ns/nr
 281         uint32_t magic;                 // ppp magic number
 282         uint32_t pin, pout;             // packet counts
 283         uint32_t cin, cout;             // byte counts
 284         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 285         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 286         uint16_t throttle_in;           // upstream throttle rate (kbps)
 287         uint16_t throttle_out;          // downstream throttle rate
 288         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 289         uint8_t filter_out;             // output filter index
 290         uint16_t mru;                   // maximum receive unit
 291         clockt opened;                  // when started
 292         clockt die;                     // being closed, when to finally free
 293         uint32_t session_timeout;       // Maximum session time in seconds
 294         uint32_t idle_timeout;          // Maximum idle time in seconds
 295         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 296         time_t last_data;               // Last data packet to/from the user (used for idle timeouts)
 297         in_addr_t dns1, dns2;           // DNS servers
 298         routet route[MAXROUTE];         // static routes
 299         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 300         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 301         int random_vector_length;
 302         uint8_t random_vector[MAXTEL];
 303         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 304         char called[MAXTEL];            // called number
 305         char calling[MAXTEL];           // calling number
 306         uint32_t tx_connect_speed;
 307         uint32_t rx_connect_speed;
 308         clockt timeout;                 // Session timeout
 309         uint32_t mrru;                  // Multilink Max-Receive-Reconstructed-Unit
 310         uint8_t mssf;                   // Multilink Short Sequence Number Header Format
 311         epdist epdis;                   // Multilink Endpoint Discriminator
 312         bundleidt bundle;               // Multilink Bundle Identifier
 313         in_addr_t snoop_ip;             // Interception destination IP
 314         uint16_t snoop_port;            // Interception destination port
 315         uint8_t walled_garden;          // is this session gardened?
 316         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 317         struct in6_addr ipv6route;      // Static IPv6 route
 318         char reserved_3[11];            // Space to expand structure without changing HB_VERSION
 319 }
 320 sessiont;
 321
 322 typedef struct
 323 {
 324         int state;                              // current state (bundlestate enum)
 325         uint32_t seq_num_t;                     // Sequence Number (transmission)
 326         uint32_t timeout;                       // Session-Timeout for bundle
 327         uint32_t max_seq;                       // Max value of sequence number field
 328         uint8_t num_of_links;                   // Number of links joint to this bundle
 329         uint32_t online_time;                   // The time this bundle is online
 330         clockt last_check;                      // Last time the timeout is checked
 331         uint32_t mrru;                          // Multilink Max-Receive-Reconstructed-Unit
 332         uint8_t mssf;                           // Multilink Short Sequence Number Header Format
 333         epdist epdis;                           // Multilink Endpoint Discriminator
 334         char user[MAXUSER];                     // Needed for matching member links
 335         sessionidt current_ses;                 // Current session to use for sending (used in RR load-balancing)
 336         sessionidt members[MAXBUNDLESES];       // Array for member links sessions
 337 }
 338 bundlet;
 339
 340 typedef struct
 341 {
 342         fragmentt fragment[MAXFRAGNUM];
 343         uint8_t reassembled_frame[MAXETHER];    // The reassembled frame
 344         uint16_t re_frame_len;                  // The reassembled frame length
 345         uint16_t re_frame_begin_index, re_frame_end_index;      // reassembled frame begin index, end index respectively
 346         uint16_t start_index, end_index;        // start and end sequence numbers available on the fragments array respectively
 347         uint32_t M;                             // Minumum frame sequence number received over all bundle members
 348         uint32_t start_seq;                     // Last received frame sequence number (bearing B bit)
 349 }
 350 fragmentationt;
 351
 352 #define AUTHPAP         1       // allow PAP
 353 #define AUTHCHAP        2       // allow CHAP
 354
 355 typedef struct
 356 {
 357         // packet counters
 358         uint32_t pin;
 359         uint32_t pout;
 360
 361         // byte counters
 362         uint32_t cin;
 363         uint32_t cout;
 364
 365         // PPP restart timer/counters
 366         struct {
 367                 time_t restart;
 368                 int conf_sent;
 369                 int nak_sent;
 370         } lcp, ipcp, ipv6cp, ccp;
 371
 372         // identifier for Protocol-Reject, Code-Reject
 373         uint8_t lcp_ident;
 374
 375         // authentication to use
 376         int lcp_authtype;
 377
 378         // our MRU
 379         uint16_t ppp_mru;
 380
 381         // our MRRU
 382         uint16_t mp_mrru;
 383
 384         // our mssf
 385         uint16_t mp_mssf;
 386
 387         // our Endpoint Discriminator
 388         in_addr_t mp_epdis;
 389
 390         // DoS prevention
 391         clockt last_packet_out;
 392         uint32_t packets_out;
 393         uint32_t packets_dropped;
 394
 395         // RADIUS session in use
 396         uint16_t radius;
 397
 398         // interim RADIUS
 399         time_t last_interim;
 400
 401         // last LCP Echo
 402         time_t last_echo;
 403
 404         // Last Multilink frame sequence number received
 405         uint32_t last_seq;
 406 } sessionlocalt;
 407
 408 // session flags
 409 #define SESSION_PFC     (1 << 0)        // use Protocol-Field-Compression
 410 #define SESSION_ACFC    (1 << 1)        // use Address-and-Control-Field-Compression
 411 #define SESSION_STARTED (1 << 2)        // RADIUS Start record sent
 412
 413 // 168 bytes per tunnel
 414 typedef struct
 415 {
 416         tunnelidt far;          // far end tunnel ID
 417         in_addr_t ip;           // Ip for far end
 418         uint16_t port;          // port for far end
 419         uint16_t window;        // Rx window
 420         uint16_t nr;            // next receive
 421         uint16_t ns;            // next send
 422         int state;              // current state (tunnelstate enum)
 423         clockt last;            // when last control message sent (used for resend timeout)
 424         clockt retry;           // when to try resending pending control
 425         clockt die;             // being closed, when to finally free
 426         clockt lastrec;         // when the last control message was received
 427         char hostname[128];     // tunnel hostname
 428         char vendor[128];       // LAC vendor
 429         uint8_t try;            // number of retrys on a control message
 430         uint16_t controlc;      // outstaind messages in queue
 431         controlt *controls;     // oldest message
 432         controlt *controle;     // newest message
 433 }
 434 tunnelt;
 435
 436 // 164 bytes per radius session
 437 typedef struct                  // outstanding RADIUS requests
 438 {
 439         sessionidt session;     // which session this applies to
 440         hasht auth;             // request authenticator
 441         clockt retry;           // when to try next
 442         char pass[129];         // password
 443         uint8_t id;             // ID for PPP response
 444         uint8_t try;            // which try we are on
 445         uint8_t state;          // state of radius requests
 446         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 447         uint8_t term_cause;     // Stop record: Acct-Terminate-Cause
 448         char const *term_msg;   //   terminate reason
 449 }
 450 radiust;
 451
 452 typedef struct
 453 {
 454         in_addr_t       address;        // Host byte order..
 455         char            assigned;       // 1 if assigned, 0 if free
 456         sessionidt      session;
 457         clockt          last;           // last used
 458         char            user[129];      // user (try to have ip addresses persistent)
 459 }
 460 ippoolt;
 461
 462 #ifdef RINGBUFFER
 463 struct Tringbuffer
 464 {
 465         struct {
 466                 char level;
 467                 sessionidt session;
 468                 tunnelidt tunnel;
 469                 char message[MAX_LOG_LENGTH];
 470         } buffer[RINGBUFFER_SIZE];
 471         int head;
 472         int tail;
 473 };
 474 #endif
 475
 476 /*
 477  * Possible tunnel states
 478  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 479  */
 480 enum
 481 {
 482         TUNNELFREE,             // Not in use
 483         TUNNELOPEN,             // Active tunnel
 484         TUNNELDIE,              // Currently closing
 485         TUNNELOPENING,          // Busy opening
 486         TUNNELUNDEF,            // Undefined
 487 };
 488
 489 enum
 490 {
 491         BUNDLEFREE,             // Not in use
 492         BUNDLEOPEN,             // Active bundle
 493         BUNDLEUNDEF,            // Undefined
 494 };
 495
 496 enum
 497 {
 498         NULLCLASS = 0,          //End Point Discriminator classes
 499         LOCALADDR,
 500         IPADDR,
 501         IEEEMACADDR,
 502         PPPMAGIC,
 503         PSNDN,
 504 };
 505
 506 enum
 507 {
 508         RADIUSNULL,             // Not in use
 509         RADIUSCHAP,             // sending CHAP down PPP
 510         RADIUSAUTH,             // sending auth to RADIUS server
 511         RADIUSSTART,            // sending start accounting to RADIUS server
 512         RADIUSSTOP,             // sending stop accounting to RADIUS server
 513         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 514         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 515         RADIUSJUSTAUTH,         // sending auth to RADIUS server, just authentication, no ip assigning
 516 };
 517
 518 struct Tstats
 519 {
 520     time_t      start_time;
 521     time_t      last_reset;
 522
 523     uint32_t    tun_rx_packets;
 524     uint32_t    tun_tx_packets;
 525     uint32_t    tun_rx_bytes;
 526     uint32_t    tun_tx_bytes;
 527     uint32_t    tun_rx_errors;
 528     uint32_t    tun_tx_errors;
 529     uint32_t    tun_rx_dropped;
 530
 531     uint32_t    tunnel_rx_packets;
 532     uint32_t    tunnel_tx_packets;
 533     uint32_t    tunnel_rx_bytes;
 534     uint32_t    tunnel_tx_bytes;
 535     uint32_t    tunnel_rx_errors;
 536     uint32_t    tunnel_tx_errors;
 537
 538     uint32_t    tunnel_retries;
 539     uint32_t    radius_retries;
 540
 541     uint32_t    arp_sent;
 542
 543     uint32_t    packets_snooped;
 544
 545     uint32_t    tunnel_created;
 546     uint32_t    session_created;
 547     uint32_t    tunnel_timeout;
 548     uint32_t    session_timeout;
 549     uint32_t    radius_timeout;
 550     uint32_t    radius_overflow;
 551     uint32_t    tunnel_overflow;
 552     uint32_t    session_overflow;
 553
 554     uint32_t    ip_allocated;
 555     uint32_t    ip_freed;
 556
 557     uint32_t    c_forwarded;
 558     uint32_t    recv_forward;
 559
 560     uint32_t    select_called;
 561     uint32_t    multi_read_used;
 562     uint32_t    multi_read_exceeded;
 563
 564 #ifdef STATISTICS
 565     uint32_t    call_processtun;
 566     uint32_t    call_processipout;
 567     uint32_t    call_processipv6out;
 568     uint32_t    call_processudp;
 569     uint32_t    call_sessionbyip;
 570     uint32_t    call_sessionbyipv6;
 571     uint32_t    call_sessionbyuser;
 572     uint32_t    call_sendarp;
 573     uint32_t    call_sendipcp;
 574     uint32_t    call_sendipv6cp;
 575     uint32_t    call_processipv6cp;
 576     uint32_t    call_tunnelsend;
 577     uint32_t    call_sessionkill;
 578     uint32_t    call_sessionshutdown;
 579     uint32_t    call_tunnelkill;
 580     uint32_t    call_tunnelshutdown;
 581     uint32_t    call_assign_ip_address;
 582     uint32_t    call_free_ip_address;
 583     uint32_t    call_dump_acct_info;
 584     uint32_t    call_sessionsetup;
 585     uint32_t    call_processpap;
 586     uint32_t    call_processchap;
 587     uint32_t    call_processlcp;
 588     uint32_t    call_processipcp;
 589     uint32_t    call_processipin;
 590     uint32_t    call_processipv6in;
 591     uint32_t    call_processccp;
 592     uint32_t    call_sendchap;
 593     uint32_t    call_processrad;
 594     uint32_t    call_radiussend;
 595     uint32_t    call_radiusretry;
 596     uint32_t    call_random_data;
 597 #endif
 598 };
 599
 600 #ifdef STATISTICS
 601
 602 #ifdef STAT_CALLS
 603 #define CSTAT(x)        STAT(call_ ## x)
 604 #else
 605 #define CSTAT(x)
 606 #endif
 607
 608 #define STAT(x)         (_statistics->x++)
 609 #define INC_STAT(x,y)   (_statistics->x += (y))
 610 #define GET_STAT(x)     (_statistics->x)
 611 #define SET_STAT(x, y)  (_statistics->x = (y))
 612 #else
 613 #define CSTAT(x)
 614 #define STAT(x)
 615 #define INC_STAT(x,y)
 616 #define GET_STAT(x)     0
 617 #define SET_STAT(x, y)
 618 #endif
 619
 620 #ifndef IFNAMSIZ
 621 # define IFNAMSIZ 16
 622 #endif
 623
 624 typedef struct
 625 {
 626         int             debug;                          // debugging level
 627         time_t          start_time;                     // time when l2tpns was started
 628         char            bandwidth[256];                 // current bandwidth
 629         char            pid_file[256];                  // file to write PID to on startup
 630         int             wrote_pid;
 631         clockt          current_time;                   // 1/10ths of a second since the process started.
 632                                                         // means that we can only run a given process
 633                                                         // for 13 years without re-starting!
 634
 635         char            config_file[128];
 636         int             reload_config;                  // flag to re-read config (set by cli)
 637         int             multi_read_count;               // amount of packets to read per fd in processing loop
 638
 639         char            tundevice[IFNAMSIZ];            // tun device name
 640         char            log_filename[128];
 641
 642         char            l2tp_secret[64];                // L2TP shared secret
 643         int             l2tp_mtu;                       // MTU of interface used for L2TP
 644
 645         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 646
 647         int             ppp_restart_time;               // timeout for PPP restart
 648         int             ppp_max_configure;              // max lcp configure requests to send
 649         int             ppp_max_failure;                // max lcp configure naks to send
 650
 651         char            radiussecret[64];
 652         int             radius_accounting;
 653         int             radius_interim;
 654         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 655         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 656         uint8_t         numradiusservers;               // radius server count
 657
 658         uint16_t        radius_dae_port;                // port for radius DAE
 659         uint16_t        radius_bind_min;                // port range for udp sockets used to send/recv radius packets
 660         uint16_t        radius_bind_max;
 661
 662         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 663         int             radius_authtypes;
 664         int             radius_authprefer;
 665
 666         int             allow_duplicate_users;          // allow multiple logins with the same username
 667         int             kill_timedout_sessions;         // kill authenticated sessions with "session_timeout == 0"
 668
 669         in_addr_t       default_dns1, default_dns2;
 670
 671         unsigned long   rl_rate;                        // default throttle rate
 672         int             num_tbfs;                       // number of throttle buckets
 673
 674         char            accounting_dir[128];
 675         in_addr_t       bind_address;
 676         in_addr_t       peer_address;
 677         int             send_garp;                      // Set to true to garp for vip address on startup
 678
 679         int             dump_speed;
 680         char            plugins[64][MAXPLUGINS];
 681         char            old_plugins[64][MAXPLUGINS];
 682
 683         int             next_tbf;                       // Next HTB id available to use
 684         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 685                                                         // policy for this process.
 686         int             lock_pages;                     // Lock pages into memory.
 687         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 688         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 689         char            epdis_addr[20];                 // MP Endpoint Discriminator address
 690
 691         in_addr_t       cluster_address;                // Multicast address of cluster.
 692                                                         // Send to this address to have everyone hear.
 693         char            cluster_interface[64];          // Which interface to listen for multicast on.
 694         int             cluster_iam_master;             // Are we the cluster master???
 695         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 696         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 697                                                         // Zero if i am the cluster master.
 698         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 699                                                         // (or the seq number we're next expecting if we're a slave).
 700         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 701         int             cluster_undefined_bundles;      // How many bundles we're yet to receive from the master.
 702         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 703         int             cluster_highest_sessionid;
 704         int             cluster_highest_bundleid;
 705         int             cluster_highest_tunnelid;
 706         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 707         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 708         int             cluster_num_changes;            // Number of changes queued.
 709
 710         int             cluster_mcast_ttl;              // TTL for multicast packets
 711         int             cluster_hb_interval;            // How often to send a heartbeat.
 712         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 713         uint64_t        cluster_table_version;          // # state changes processed by cluster
 714
 715         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 716
 717
 718         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 719                                                         // slaves is less than this value.
 720         in_addr_t       cli_bind_address;               // bind address for CLI
 721         char            hostname[MAXHOSTNAME];  // hostname (overridden by -h on command line)
 722         // Guest change
 723         char            guest_user[MAXUSER];            // Guest account username
 724
 725 #ifdef BGP
 726 #define BGP_NUM_PEERS   2
 727         uint16_t as_number;
 728         struct {
 729                 char name[64];
 730                 uint16_t as;
 731                 int keepalive;
 732                 int hold;
 733                 struct in_addr update_source;
 734         } neighbour[BGP_NUM_PEERS];
 735         in_addr_t       nexthop_address;
 736         struct in6_addr nexthop6_address;
 737 #endif
 738 } configt;
 739
 740 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
 741 typedef struct
 742 {
 743         char *key;
 744         int offset;
 745         int size;
 746         enum config_typet type;
 747 } config_descriptt;
 748
 749 typedef struct
 750 {
 751         uint8_t op;     // operation
 752 #define FILTER_PORT_OP_NONE     0 // all ports match
 753 #define FILTER_PORT_OP_EQ       1
 754 #define FILTER_PORT_OP_NEQ      2
 755 #define FILTER_PORT_OP_GT       3
 756 #define FILTER_PORT_OP_LT       4
 757 #define FILTER_PORT_OP_RANGE    5
 758         uint16_t port;  // port (host byte order)
 759         uint16_t port2; // range
 760 } ip_filter_portt;
 761
 762 typedef struct
 763 {
 764         int action;             // permit/deny
 765 #define FILTER_ACTION_DENY      1
 766 #define FILTER_ACTION_PERMIT    2
 767         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 768         in_addr_t src_ip;       // source ip (network byte order)
 769         in_addr_t src_wild;
 770         ip_filter_portt src_ports;
 771         in_addr_t dst_ip;       // dest ip
 772         in_addr_t dst_wild;
 773         ip_filter_portt dst_ports;
 774         uint8_t frag;           // apply to non-initial fragments
 775         uint8_t tcp_flag_op;    // match type: any, all, established
 776 #define FILTER_FLAG_OP_ANY      1
 777 #define FILTER_FLAG_OP_ALL      2
 778 #define FILTER_FLAG_OP_EST      3
 779         uint8_t tcp_sflags;     // flags set
 780         uint8_t tcp_cflags;     // flags clear
 781         uint32_t counter;       // match count
 782 } ip_filter_rulet;
 783
 784 #define TCP_FLAG_FIN    0x01
 785 #define TCP_FLAG_SYN    0x02
 786 #define TCP_FLAG_RST    0x04
 787 #define TCP_FLAG_PSH    0x08
 788 #define TCP_FLAG_ACK    0x10
 789 #define TCP_FLAG_URG    0x20
 790
 791 #define MAXFILTER               32
 792 #define MAXFILTER_RULES         32
 793 typedef struct
 794 {
 795         char name[32];          // ACL name
 796         int extended;           // type: 0 = standard, 1 = extended
 797         ip_filter_rulet rules[MAXFILTER_RULES];
 798         int used;               // session ref count
 799 } ip_filtert;
 800
 801 // CDN result/error codes
 802 #define CDN_NONE                        0, 0
 803 #define CDN_TRY_ANOTHER                 2, 7
 804 #define CDN_ADMIN_DISC                  3, 0
 805 #define CDN_UNAVAILABLE                 4, 0
 806
 807 // RADIUS Acct-Terminate-Cause values
 808 #define TERM_USER_REQUEST               1
 809 #define TERM_LOST_CARRIER               2
 810 #define TERM_LOST_SERVICE               3
 811 #define TERM_IDLE_TIMEOUT               4
 812 #define TERM_SESSION_TIMEOUT            5
 813 #define TERM_ADMIN_RESET                6
 814 #define TERM_ADMIN_REBOOT               7
 815 #define TERM_PORT_ERROR                 8
 816 #define TERM_NAS_ERROR                  9
 817 #define TERM_NAS_REQUEST                10
 818 #define TERM_NAS_REBOOT                 11
 819 #define TERM_PORT_UNNEEDED              12
 820 #define TERM_PORT_PREEMPTED             13
 821 #define TERM_PORT_SUSPENDED             14
 822 #define TERM_SERVICE_UNAVAILABLE        15
 823 #define TERM_CALLBACK                   16
 824 #define TERM_USER_ERROR                 17
 825 #define TERM_HOST_REQUEST               18
 826 #define TERM_SUPPLICANT_RESTART         19
 827 #define TERM_REAUTHENTICATION_FAILURE   20
 828 #define TERM_PORT_REINIT                21
 829 #define TERM_PORT_DISABLED              22
 830
 831 // arp.c
 832 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 833
 834
 835 // ppp.c
 836 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 837 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 838 void lcp_open(sessionidt s, tunnelidt t);
 839 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 840 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 841 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 842 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 843 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 844 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
 845 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 846 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 847 void sendchap(sessionidt s, tunnelidt t);
 848 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);
 849 void sendlcp(sessionidt s, tunnelidt t);
 850 void send_ipin(sessionidt s, uint8_t *buf, int len);
 851 void sendccp(sessionidt s, tunnelidt t);
 852 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
 853 int join_bundle(sessionidt s);
 854
 855
 856 // radius.c
 857 void initrad(void);
 858 void radiussend(uint16_t r, uint8_t state);
 859 void processrad(uint8_t *buf, int len, char socket_index);
 860 void radiusretry(uint16_t r);
 861 uint16_t radiusnew(sessionidt s);
 862 void radiusclear(uint16_t r, sessionidt s);
 863 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
 864
 865
 866 // l2tpns.c
 867 clockt backoff(uint8_t try);
 868 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 869 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 870 sessionidt sessionbyip(in_addr_t ip);
 871 sessionidt sessionbyipv6(struct in6_addr ip);
 872 sessionidt sessionbyuser(char *username);
 873 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 874 void random_data(uint8_t *buf, int len);
 875 void sessionkill(sessionidt s, char *reason);
 876 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
 877 void filter_session(sessionidt s, int filter_in, int filter_out);
 878 void send_garp(in_addr_t ip);
 879 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 880 int tun_write(uint8_t *data, int size);
 881 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 882 void sendipcp(sessionidt s, tunnelidt t);
 883 void sendipv6cp(sessionidt s, tunnelidt t);
 884 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 885 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 886 int find_filter(char const *name, size_t len);
 887 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 888 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 889 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 890 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 891
 892 #undef LOG
 893 #undef LOG_HEX
 894 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 895 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 896
 897 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 898 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 899
 900
 901 int sessionsetup(sessionidt s, tunnelidt t);
 902 int run_plugins(int plugin_type, void *data);
 903 void rebuild_address_pool(void);
 904 void throttle_session(sessionidt s, int rate_in, int rate_out);
 905 int load_session(sessionidt, sessiont *);
 906 void become_master(void);       // We're the master; kick off any required master initializations.
 907
 908
 909 // cli.c
 910 void init_cli(char *hostname);
 911 void cli_do_file(FILE *fh);
 912 void cli_do(int sockfd);
 913 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 914
 915
 916 // icmp.c
 917 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 918
 919
 920 extern tunnelt *tunnel;
 921 extern bundlet *bundle;
 922 extern sessiont *session;
 923 extern sessionlocalt *sess_local;
 924 extern ippoolt *ip_address_pool;
 925 #define sessionfree (session[0].next)
 926
 927
 928 extern configt *config;
 929 extern time_t basetime;         // Time when this process started.
 930 extern time_t time_now;         // Seconds since EPOCH.
 931 extern char main_quit;
 932 extern uint32_t last_id;
 933 extern struct Tstats *_statistics;
 934 extern in_addr_t my_address;
 935 extern int clifd;
 936 extern int epollfd;
 937
 938 struct event_data {
 939         enum {
 940                 FD_TYPE_CLI,
 941                 FD_TYPE_CLUSTER,
 942                 FD_TYPE_TUN,
 943                 FD_TYPE_UDP,
 944                 FD_TYPE_CONTROL,
 945                 FD_TYPE_DAE,
 946                 FD_TYPE_RADIUS,
 947                 FD_TYPE_BGP,
 948                 FD_TYPE_NETLINK,
 949         } type;
 950         int index; // for RADIUS, BGP
 951 };
 952
 953 #define TIME (config->current_time)
 954
 955 extern uint16_t MRU;
 956 extern uint16_t MSS;
 957
 958 // macros for handling help in cli commands
 959 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 960 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 961
 962 // CVS identifiers (for "show version file")
 963 extern char const *cvs_id_arp;
 964 extern char const *cvs_id_cli;
 965 extern char const *cvs_id_cluster;
 966 extern char const *cvs_id_constants;
 967 extern char const *cvs_id_control;
 968 extern char const *cvs_id_icmp;
 969 extern char const *cvs_id_l2tpns;
 970 extern char const *cvs_id_ll;
 971 extern char const *cvs_id_md5;
 972 extern char const *cvs_id_ppp;
 973 extern char const *cvs_id_radius;
 974 extern char const *cvs_id_tbf;
 975 extern char const *cvs_id_util;
 976
 977 #endif /* __L2TPNS_H__ */