l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.87 2005/09/02 23:59:56 bodea Exp $
   3
   4 #ifndef __L2TPNS_H__
   5 #define __L2TPNS_H__
   6
   7 #include <netinet/in.h>
   8 #include <execinfo.h>
   9 #include <stdio.h>
  10 #include <signal.h>
  11 #include <stdlib.h>
  12 #include <netinet/in.h>
  13 #include <sys/socket.h>
  14 #include <arpa/inet.h>
  15 #include <sys/types.h>
  16 #include <libcli.h>
  17
  18 #define VERSION "2.1.5"
  19
  20 // Limits
  21 #define MAXTUNNEL       500             // could be up to 65535
  22 #define MAXSESSION      60000           // could be up to 65535
  23 #define MAXTBFS         6000            // Maximum token bucket filters. Might need up to 2 * session.
  24
  25 #define RADIUS_SHIFT    6
  26 #define RADIUS_FDS      (1 << RADIUS_SHIFT)
  27 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  28 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  29
  30 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  31 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  32
  33 #define MAXCONTROL      1000            // max length control message we ever send...
  34 #define MAXETHER        (1500+18)       // max packet we try sending to tun
  35 #define MAXTEL          96              // telephone number
  36 #define MAXUSER         128             // username
  37 #define MAXPASS         128             // password
  38 #define MAXPLUGINS      20              // maximum number of plugins to load
  39 #define MAXRADSERVER    10              // max radius servers
  40 #define MAXROUTE        10              // max static routes per session
  41 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  42 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  43 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  44 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  45 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  46 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  47 #define DEFAULT_MRU     1452            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
  48
  49 // Constants
  50 #ifndef ETCDIR
  51 #define ETCDIR          "/etc/l2tpns"
  52 #endif
  53
  54 #ifndef LIBDIR
  55 #define LIBDIR          "/usr/lib/l2tpns"
  56 #endif
  57
  58 #ifndef PLUGINDIR
  59 #define PLUGINDIR       LIBDIR          // Plugins
  60 #endif
  61
  62 #ifndef PLUGINCONF
  63 #define PLUGINCONF      ETCDIR          // Plugin config dir
  64 #endif
  65
  66 #ifndef FLASHDIR
  67 #define FLASHDIR        ETCDIR
  68 #endif
  69
  70 #define TUNDEVICE       "/dev/net/tun"
  71 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  72 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  73 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  74 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  75 #define ACCT_TIME       3000                            // 5 minute accounting interval
  76 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  77 #define L2TPPORT        1701                            // L2TP port
  78 #define RADPORT         1645                            // old radius port...
  79 #define DAEPORT         3799                            // DAE port
  80 #define PKTARP          0x0806                          // ARP packet type
  81 #define PKTIP           0x0800                          // IPv4 packet type
  82 #define PKTIPV6         0x86DD                          // IPv6 packet type
  83 #define PPPPAP          0xC023
  84 #define PPPCHAP         0xC223
  85 #define PPPLCP          0xC021
  86 #define PPPIPCP         0x8021
  87 #define PPPIPV6CP       0x8057
  88 #define PPPCCP          0x80FD
  89 #define PPPIP           0x0021
  90 #define PPPIPV6         0x0057
  91 #define PPPMP           0x003D
  92 #define MIN_IP_SIZE     0x19
  93
  94 enum {
  95         ConfigReq = 1,
  96         ConfigAck,
  97         ConfigNak,
  98         ConfigRej,
  99         TerminateReq,
 100         TerminateAck,
 101         CodeRej,
 102         ProtocolRej,
 103         EchoReq,
 104         EchoReply,
 105         DiscardRequest,
 106         IdentRequest
 107 };
 108
 109 enum {
 110         AccessRequest = 1,
 111         AccessAccept,
 112         AccessReject,
 113         AccountingRequest,
 114         AccountingResponse,
 115         AccessChallenge = 11,
 116         DisconnectRequest = 40,
 117         DisconnectACK,
 118         DisconnectNAK,
 119         CoARequest,
 120         CoAACK,
 121         CoANAK
 122 };
 123
 124 // PPP phases
 125 enum {
 126         Dead,
 127         Establish,
 128         Authenticate,
 129         Network,
 130         Terminate
 131 };
 132
 133 // PPP states
 134 enum {
 135         Initial,
 136         Starting,
 137         Closed,
 138         Stopped,
 139         Closing,
 140         Stopping,
 141         RequestSent,
 142         AckReceived,
 143         AckSent,
 144         Opened
 145 };
 146
 147 // reset state machine counters
 148 #define initialise_restart_count(_s, _fsm)                      \
 149         sess_local[_s]._fsm.conf_sent = sess_local[_s]._fsm.nak_sent
 150
 151 // stop timer on change to state where timer does not run
 152 #define change_state(_s, _fsm, _new) ({                         \
 153         if (_new != session[_s].ppp._fsm)                       \
 154         {                                                       \
 155                 switch (_new)                                   \
 156                 {                                               \
 157                 case Initial:                                   \
 158                 case Starting:                                  \
 159                 case Closed:                                    \
 160                 case Stopped:                                   \
 161                 case Opened:                                    \
 162                         sess_local[_s]._fsm.restart = 0;        \
 163                         initialise_restart_count(_s, _fsm);     \
 164                 }                                               \
 165                 session[_s].ppp._fsm = _new;                    \
 166                 cluster_send_session(_s);                       \
 167         }                                                       \
 168 })
 169
 170 // Types
 171 typedef uint16_t sessionidt;
 172 typedef uint16_t tunnelidt;
 173 typedef uint32_t clockt;
 174 typedef uint8_t hasht[16];
 175
 176 // CLI actions
 177 struct cli_session_actions {
 178         char action;
 179         in_addr_t snoop_ip;
 180         uint16_t snoop_port;
 181         int throttle_in;
 182         int throttle_out;
 183         int filter_in;
 184         int filter_out;
 185 };
 186
 187 #define CLI_SESS_KILL           0x01
 188 #define CLI_SESS_SNOOP          0x02
 189 #define CLI_SESS_NOSNOOP        0x04
 190 #define CLI_SESS_THROTTLE       0x08
 191 #define CLI_SESS_NOTHROTTLE     0x10
 192 #define CLI_SESS_FILTER         0x20
 193 #define CLI_SESS_NOFILTER       0x40
 194
 195 struct cli_tunnel_actions {
 196         char action;
 197 };
 198
 199 #define CLI_TUN_KILL            0x01
 200
 201 // structures
 202 typedef struct                  // route
 203 {
 204         in_addr_t ip;
 205         in_addr_t mask;
 206 }
 207 routet;
 208
 209 typedef struct controls         // control message
 210 {
 211         struct controls *next;  // next in queue
 212         uint16_t length;        // length
 213         uint8_t buf[MAXCONTROL];
 214 }
 215 controlt;
 216
 217 typedef struct
 218 {
 219         sessionidt next;                // next session in linked list
 220         sessionidt far;                 // far end session ID
 221         tunnelidt tunnel;               // near end tunnel ID
 222         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 223         struct {
 224                 uint8_t phase;          // PPP phase
 225                 uint8_t lcp:4;          //   LCP    state
 226                 uint8_t ipcp:4;         //   IPCP   state
 227                 uint8_t ipv6cp:4;       //   IPV6CP state
 228                 uint8_t ccp:4;          //   CCP    state
 229                 uint8_t pad;            // unused
 230         } ppp;
 231         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 232         int ip_pool_index;              // index to IP pool
 233         uint32_t unique_id;             // unique session id
 234         uint16_t nr;                    // next receive
 235         uint16_t ns;                    // next send
 236         uint32_t magic;                 // ppp magic number
 237         uint32_t pin, pout;             // packet counts
 238         uint32_t cin, cout;             // byte counts
 239         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 240         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 241         uint16_t throttle_in;           // upstream throttle rate (kbps)
 242         uint16_t throttle_out;          // downstream throttle rate
 243         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 244         uint8_t filter_out;             // output filter index
 245         uint16_t mru;                   // maximum receive unit
 246         clockt opened;                  // when started
 247         clockt die;                     // being closed, when to finally free
 248         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 249         in_addr_t dns1, dns2;           // DNS servers
 250         routet route[MAXROUTE];         // static routes
 251         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 252         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 253         int random_vector_length;
 254         uint8_t random_vector[MAXTEL];
 255         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 256         char called[MAXTEL];            // called number
 257         char calling[MAXTEL];           // calling number
 258         uint32_t tx_connect_speed;
 259         uint32_t rx_connect_speed;
 260         in_addr_t snoop_ip;             // Interception destination IP
 261         uint16_t snoop_port;            // Interception destination port
 262         uint8_t walled_garden;          // is this session gardened?
 263         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 264         struct in6_addr ipv6route;      // Static IPv6 route
 265         char reserved[11];              // Space to expand structure without changing HB_VERSION
 266 }
 267 sessiont;
 268
 269 #define AUTHPAP         1       // allow PAP
 270 #define AUTHCHAP        2       // allow CHAP
 271
 272 typedef struct
 273 {
 274         // packet counters
 275         uint32_t pin;
 276         uint32_t pout;
 277
 278         // byte counters
 279         uint32_t cin;
 280         uint32_t cout;
 281
 282         // PPP restart timer/counters
 283         struct {
 284                 time_t restart;
 285                 int conf_sent;
 286                 int nak_sent;
 287         } lcp, ipcp, ipv6cp, ccp;
 288
 289         // authentication to use
 290         int lcp_authtype;
 291
 292         // DoS prevention
 293         clockt last_packet_out;
 294         uint32_t packets_out;
 295         uint32_t packets_dropped;
 296
 297         // RADIUS session in use
 298         uint16_t radius;
 299
 300         // interim RADIUS
 301         time_t last_interim;
 302 } sessionlocalt;
 303
 304 #define SESSIONPFC      1       // PFC negotiated flags
 305 #define SESSIONACFC     2       // ACFC negotiated flags
 306
 307 // 168 bytes per tunnel
 308 typedef struct
 309 {
 310         tunnelidt far;          // far end tunnel ID
 311         in_addr_t ip;           // Ip for far end
 312         uint16_t port;          // port for far end
 313         uint16_t window;        // Rx window
 314         uint16_t nr;            // next receive
 315         uint16_t ns;            // next send
 316         int state;              // current state (tunnelstate enum)
 317         clockt last;            // when last control message sent (used for resend timeout)
 318         clockt retry;           // when to try resenting pending control
 319         clockt die;             // being closed, when to finally free
 320         clockt lastrec;         // when the last control message was received
 321         char hostname[128];     // tunnel hostname
 322         char vendor[128];       // LAC vendor
 323         uint8_t try;            // number of retrys on a control message
 324         uint16_t controlc;      // outstaind messages in queue
 325         controlt *controls;     // oldest message
 326         controlt *controle;     // newest message
 327 }
 328 tunnelt;
 329
 330 // 160 bytes per radius session
 331 typedef struct                  // outstanding RADIUS requests
 332 {
 333         sessionidt session;     // which session this applies to
 334         hasht auth;             // request authenticator
 335         clockt retry;           // when to try next
 336         char pass[129];         // password
 337         uint8_t id;             // ID for PPP response
 338         uint8_t try;            // which try we are on
 339         uint8_t state;          // state of radius requests
 340         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 341 }
 342 radiust;
 343
 344 typedef struct
 345 {
 346         in_addr_t       address;        // Host byte order..
 347         char            assigned;       // 1 if assigned, 0 if free
 348         sessionidt      session;
 349         clockt          last;           // last used
 350         char            user[129];      // user (try to have ip addresses persistent)
 351 }
 352 ippoolt;
 353
 354 #ifdef RINGBUFFER
 355 struct Tringbuffer
 356 {
 357         struct {
 358                 char level;
 359                 sessionidt session;
 360                 tunnelidt tunnel;
 361                 char message[MAX_LOG_LENGTH];
 362         } buffer[RINGBUFFER_SIZE];
 363         int head;
 364         int tail;
 365 };
 366 #endif
 367
 368 /*
 369  * Possible tunnel states
 370  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 371  */
 372 enum
 373 {
 374         TUNNELFREE,             // Not in use
 375         TUNNELOPEN,             // Active tunnel
 376         TUNNELDIE,              // Currently closing
 377         TUNNELOPENING,          // Busy opening
 378         TUNNELUNDEF,            // Undefined
 379 };
 380
 381 enum
 382 {
 383         RADIUSNULL,             // Not in use
 384         RADIUSCHAP,             // sending CHAP down PPP
 385         RADIUSAUTH,             // sending auth to RADIUS server
 386         RADIUSSTART,            // sending start accounting to RADIUS server
 387         RADIUSSTOP,             // sending stop accounting to RADIUS server
 388         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 389         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 390 };
 391
 392 struct Tstats
 393 {
 394     time_t      start_time;
 395     time_t      last_reset;
 396
 397     uint32_t    tun_rx_packets;
 398     uint32_t    tun_tx_packets;
 399     uint32_t    tun_rx_bytes;
 400     uint32_t    tun_tx_bytes;
 401     uint32_t    tun_rx_errors;
 402     uint32_t    tun_tx_errors;
 403     uint32_t    tun_rx_dropped;
 404
 405     uint32_t    tunnel_rx_packets;
 406     uint32_t    tunnel_tx_packets;
 407     uint32_t    tunnel_rx_bytes;
 408     uint32_t    tunnel_tx_bytes;
 409     uint32_t    tunnel_rx_errors;
 410     uint32_t    tunnel_tx_errors;
 411
 412     uint32_t    tunnel_retries;
 413     uint32_t    radius_retries;
 414
 415     uint32_t    arp_sent;
 416
 417     uint32_t    packets_snooped;
 418
 419     uint32_t    tunnel_created;
 420     uint32_t    session_created;
 421     uint32_t    tunnel_timeout;
 422     uint32_t    session_timeout;
 423     uint32_t    radius_timeout;
 424     uint32_t    radius_overflow;
 425     uint32_t    tunnel_overflow;
 426     uint32_t    session_overflow;
 427
 428     uint32_t    ip_allocated;
 429     uint32_t    ip_freed;
 430
 431     uint32_t    c_forwarded;
 432     uint32_t    recv_forward;
 433
 434     uint32_t    select_called;
 435     uint32_t    multi_read_used;
 436     uint32_t    multi_read_exceeded;
 437
 438 #ifdef STATISTICS
 439     uint32_t    call_processtun;
 440     uint32_t    call_processipout;
 441     uint32_t    call_processipv6out;
 442     uint32_t    call_processudp;
 443     uint32_t    call_sessionbyip;
 444     uint32_t    call_sessionbyipv6;
 445     uint32_t    call_sessionbyuser;
 446     uint32_t    call_sendarp;
 447     uint32_t    call_sendipcp;
 448     uint32_t    call_sendipv6cp;
 449     uint32_t    call_processipv6cp;
 450     uint32_t    call_tunnelsend;
 451     uint32_t    call_sessionkill;
 452     uint32_t    call_sessionshutdown;
 453     uint32_t    call_tunnelkill;
 454     uint32_t    call_tunnelshutdown;
 455     uint32_t    call_assign_ip_address;
 456     uint32_t    call_free_ip_address;
 457     uint32_t    call_dump_acct_info;
 458     uint32_t    call_sessionsetup;
 459     uint32_t    call_processpap;
 460     uint32_t    call_processchap;
 461     uint32_t    call_processlcp;
 462     uint32_t    call_processipcp;
 463     uint32_t    call_processipin;
 464     uint32_t    call_processipv6in;
 465     uint32_t    call_processccp;
 466     uint32_t    call_sendchap;
 467     uint32_t    call_processrad;
 468     uint32_t    call_radiussend;
 469     uint32_t    call_radiusretry;
 470     uint32_t    call_random_data;
 471 #endif
 472 };
 473
 474 #ifdef STATISTICS
 475
 476 #ifdef STAT_CALLS
 477 #define CSTAT(x)        STAT(call_ ## x)
 478 #else
 479 #define CSTAT(x)
 480 #endif
 481
 482 #define STAT(x)         (_statistics->x++)
 483 #define INC_STAT(x,y)   (_statistics->x += (y))
 484 #define GET_STAT(x)     (_statistics->x)
 485 #define SET_STAT(x, y)  (_statistics->x = (y))
 486 #else
 487 #define CSTAT(x)
 488 #define STAT(x)
 489 #define INC_STAT(x,y)
 490 #define GET_STAT(x)     0
 491 #define SET_STAT(x, y)
 492 #endif
 493
 494 typedef struct
 495 {
 496         int             debug;                          // debugging level
 497         time_t          start_time;                     // time when l2tpns was started
 498         char            bandwidth[256];                 // current bandwidth
 499         char            pid_file[256];                  // file to write PID to on startup
 500         int             wrote_pid;
 501         clockt          current_time;                   // 1/10ths of a second since the process started.
 502                                                         // means that we can only run a given process
 503                                                         // for 13 years without re-starting!
 504
 505         char            config_file[128];
 506         int             reload_config;                  // flag to re-read config (set by cli)
 507         int             multi_read_count;               // amount of packets to read per fd in processing loop
 508
 509         char            tundevice[10];                  // tun device name
 510         char            log_filename[128];
 511         char            l2tpsecret[64];
 512
 513         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 514
 515         int             ppp_restart_time;               // timeout for PPP restart
 516         int             ppp_max_configure;              // max lcp configure requests to send
 517         int             ppp_max_failure;                // max lcp configure naks to send
 518
 519         char            radiussecret[64];
 520         int             radius_accounting;
 521         int             radius_interim;
 522         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 523         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 524         uint8_t         numradiusservers;               // radius server count
 525
 526         uint16_t        radius_dae_port;                // local port for radius dae
 527
 528         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 529         int             radius_authtypes;
 530         int             radius_authprefer;
 531
 532         int             allow_duplicate_users;          // allow multiple logins with the same username
 533
 534         in_addr_t       default_dns1, default_dns2;
 535
 536         unsigned long   rl_rate;                        // default throttle rate
 537         int             num_tbfs;                       // number of throttle buckets
 538
 539         char            accounting_dir[128];
 540         in_addr_t       bind_address;
 541         in_addr_t       peer_address;
 542         int             send_garp;                      // Set to true to garp for vip address on startup
 543
 544         int             target_uid;
 545         int             dump_speed;
 546         char            plugins[64][MAXPLUGINS];
 547         char            old_plugins[64][MAXPLUGINS];
 548
 549         int             next_tbf;                       // Next HTB id available to use
 550         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 551                                                         // policy for this process.
 552         int             lock_pages;                     // Lock pages into memory.
 553         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 554         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 555
 556         in_addr_t       cluster_address;                // Multicast address of cluster.
 557                                                         // Send to this address to have everyone hear.
 558         char            cluster_interface[64];          // Which interface to listen for multicast on.
 559         int             cluster_iam_master;             // Are we the cluster master???
 560         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 561         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 562                                                         // Zero if i am the cluster master.
 563         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 564                                                         // (or the seq number we're next expecting if we're a slave).
 565         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 566         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 567         int             cluster_highest_sessionid;
 568         int             cluster_highest_tunnelid;
 569         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 570         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 571         int             cluster_num_changes;            // Number of changes queued.
 572
 573         int             cluster_mcast_ttl;              // TTL for multicast packets
 574         int             cluster_hb_interval;            // How often to send a heartbeat.
 575         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 576         uint64_t        cluster_table_version;          // # state changes processed by cluster
 577
 578         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 579
 580
 581         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 582                                                         // slaves is less than this value.
 583
 584 #ifdef BGP
 585 #define BGP_NUM_PEERS   2
 586         uint16_t as_number;
 587         struct {
 588                 char name[64];
 589                 uint16_t as;
 590                 int keepalive;
 591                 int hold;
 592         } neighbour[BGP_NUM_PEERS];
 593 #endif
 594 } configt;
 595
 596 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 597 typedef struct
 598 {
 599         char *key;
 600         int offset;
 601         int size;
 602         enum config_typet type;
 603 } config_descriptt;
 604
 605 typedef struct
 606 {
 607         uint8_t op;     // operation
 608 #define FILTER_PORT_OP_NONE     0 // all ports match
 609 #define FILTER_PORT_OP_EQ       1
 610 #define FILTER_PORT_OP_NEQ      2
 611 #define FILTER_PORT_OP_GT       3
 612 #define FILTER_PORT_OP_LT       4
 613 #define FILTER_PORT_OP_RANGE    5
 614         uint16_t port;  // port (host byte order)
 615         uint16_t port2; // range
 616 } ip_filter_portt;
 617
 618 typedef struct
 619 {
 620         int action;             // permit/deny
 621 #define FILTER_ACTION_DENY      1
 622 #define FILTER_ACTION_PERMIT    2
 623         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 624         in_addr_t src_ip;       // source ip (network byte order)
 625         in_addr_t src_wild;
 626         ip_filter_portt src_ports;
 627         in_addr_t dst_ip;       // dest ip
 628         in_addr_t dst_wild;
 629         ip_filter_portt dst_ports;
 630         uint8_t frag;           // apply to non-initial fragments
 631         uint8_t tcp_flag_op;    // match type: any, all, established
 632 #define FILTER_FLAG_OP_ANY      1
 633 #define FILTER_FLAG_OP_ALL      2
 634 #define FILTER_FLAG_OP_EST      3
 635         uint8_t tcp_sflags;     // flags set
 636         uint8_t tcp_cflags;     // flags clear
 637         uint32_t counter;       // match count
 638 } ip_filter_rulet;
 639
 640 #define TCP_FLAG_FIN    0x01
 641 #define TCP_FLAG_SYN    0x02
 642 #define TCP_FLAG_RST    0x04
 643 #define TCP_FLAG_PSH    0x08
 644 #define TCP_FLAG_ACK    0x10
 645 #define TCP_FLAG_URG    0x20
 646
 647 #define MAXFILTER               32
 648 #define MAXFILTER_RULES         32
 649 typedef struct
 650 {
 651         char name[32];          // ACL name
 652         int extended;           // type: 0 = standard, 1 = extended
 653         ip_filter_rulet rules[MAXFILTER_RULES];
 654         int used;               // session ref count
 655 } ip_filtert;
 656
 657 // arp.c
 658 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 659
 660
 661 // ppp.c
 662 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 663 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 664 void lcp_open(sessionidt s, tunnelidt t);
 665 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 666 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 667 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 668 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 669 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 670 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 671 void sendchap(sessionidt s, tunnelidt t);
 672 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
 673 void sendlcp(sessionidt s, tunnelidt t);
 674 void send_ipin(sessionidt s, uint8_t *buf, int len);
 675 void sendccp(sessionidt s, tunnelidt t);
 676
 677
 678 // radius.c
 679 void initrad(void);
 680 void radiussend(uint16_t r, uint8_t state);
 681 void processrad(uint8_t *buf, int len, char socket_index);
 682 void radiusretry(uint16_t r);
 683 uint16_t radiusnew(sessionidt s);
 684 void radiusclear(uint16_t r, sessionidt s);
 685 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
 686
 687
 688 // l2tpns.c
 689 clockt backoff(uint8_t try);
 690 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 691 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 692 sessionidt sessionbyip(in_addr_t ip);
 693 sessionidt sessionbyipv6(struct in6_addr ip);
 694 sessionidt sessionbyuser(char *username);
 695 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 696 void random_data(uint8_t *buf, int len);
 697 void sessionkill(sessionidt s, char *reason);
 698 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 699 void filter_session(sessionidt s, int filter_in, int filter_out);
 700 void send_garp(in_addr_t ip);
 701 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 702 void sendipcp(sessionidt s, tunnelidt t);
 703 void sendipv6cp(sessionidt s, tunnelidt t);
 704 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 705 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 706 int find_filter(char const *name, size_t len);
 707 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 708 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 709 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 710 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 711
 712 #undef LOG
 713 #undef LOG_HEX
 714 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 715 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 716
 717 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 718 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 719
 720 int sessionsetup(sessionidt s, tunnelidt t);
 721 int run_plugins(int plugin_type, void *data);
 722 void rebuild_address_pool(void);
 723 void throttle_session(sessionidt s, int rate_in, int rate_out);
 724 int load_session(sessionidt, sessiont *);
 725 void become_master(void);       // We're the master; kick off any required master initializations.
 726
 727
 728 // cli.c
 729 void init_cli(char *hostname);
 730 void cli_do_file(FILE *fh);
 731 void cli_do(int sockfd);
 732 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 733
 734
 735 // icmp.c
 736 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 737
 738
 739 extern tunnelt *tunnel;
 740 extern sessiont *session;
 741 extern sessionlocalt *sess_local;
 742 extern ippoolt *ip_address_pool;
 743 #define sessionfree (session[0].next)
 744
 745 #define log_backtrace(count, max) \
 746 if (count++ < max) { \
 747         void *array[20]; \
 748         char **strings; \
 749         int size, i; \
 750         LOG(0, 0, t, "Backtrace follows:\n"); \
 751         size = backtrace(array, 10); \
 752         strings = backtrace_symbols(array, size); \
 753         if (strings) for (i = 0; i < size; i++) \
 754         { \
 755                 LOG(0, 0, t, " %s\n", strings[i]); \
 756         } \
 757         free(strings); \
 758 }
 759
 760
 761 extern configt *config;
 762 extern time_t basetime;         // Time when this process started.
 763 extern time_t time_now;         // Seconds since EPOCH.
 764 extern char main_quit;
 765 extern uint32_t last_id;
 766 extern struct Tstats *_statistics;
 767 extern in_addr_t my_address;
 768 extern int tun_write(uint8_t *data, int size);
 769 extern int clifd;
 770 extern int epollfd;
 771
 772 struct event_data {
 773         enum {
 774                 FD_TYPE_CLI,
 775                 FD_TYPE_CLUSTER,
 776                 FD_TYPE_TUN,
 777                 FD_TYPE_UDP,
 778                 FD_TYPE_CONTROL,
 779                 FD_TYPE_DAE,
 780                 FD_TYPE_RADIUS,
 781                 FD_TYPE_BGP,
 782         } type;
 783         int index; // for RADIUS, BGP
 784 };
 785
 786 #define TIME (config->current_time)
 787
 788 // macros for handling help in cli commands
 789 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 790 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 791
 792 // CVS identifiers (for "show version file")
 793 extern char const *cvs_id_arp;
 794 extern char const *cvs_id_cli;
 795 extern char const *cvs_id_cluster;
 796 extern char const *cvs_id_constants;
 797 extern char const *cvs_id_control;
 798 extern char const *cvs_id_icmp;
 799 extern char const *cvs_id_l2tpns;
 800 extern char const *cvs_id_ll;
 801 extern char const *cvs_id_md5;
 802 extern char const *cvs_id_ppp;
 803 extern char const *cvs_id_radius;
 804 extern char const *cvs_id_tbf;
 805 extern char const *cvs_id_util;
 806
 807 #endif /* __L2TPNS_H__ */