l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.94 2005/10/11 07:06:56 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 "2.1.9"
  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 MINMTU          576             // minimum recommended MTU (rfc1063)
  35 #define PPPMTU          1500            // default PPP MTU
  36 #define MAXMTU          2600            // arbitrary maximum MTU
  37 #define MAXETHER        (MAXMTU+18)     // max packet we try sending to tun
  38 #define MAXTEL          96              // telephone number
  39 #define MAXUSER         128             // username
  40 #define MAXPASS         128             // password
  41 #define MAXPLUGINS      20              // maximum number of plugins to load
  42 #define MAXRADSERVER    10              // max radius servers
  43 #define MAXROUTE        10              // max static routes per session
  44 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  45 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  46 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  47 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  48 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  49 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  50
  51 // Constants
  52 #ifndef ETCDIR
  53 #define ETCDIR          "/etc/l2tpns"
  54 #endif
  55
  56 #ifndef LIBDIR
  57 #define LIBDIR          "/usr/lib/l2tpns"
  58 #endif
  59
  60 #ifndef PLUGINDIR
  61 #define PLUGINDIR       LIBDIR          // Plugins
  62 #endif
  63
  64 #ifndef PLUGINCONF
  65 #define PLUGINCONF      ETCDIR          // Plugin config dir
  66 #endif
  67
  68 #ifndef FLASHDIR
  69 #define FLASHDIR        ETCDIR
  70 #endif
  71
  72 #define TUNDEVICE       "/dev/net/tun"
  73 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  74 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  75 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  76 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  77 #define ACCT_TIME       3000                            // 5 minute accounting interval
  78 #define ACCT_SHUT_TIME  600                             // 1 minute for counters of shutdown sessions
  79 #define L2TPPORT        1701                            // L2TP port
  80 #define RADPORT         1645                            // old radius port...
  81 #define DAEPORT         3799                            // DAE port
  82 #define PKTARP          0x0806                          // ARP packet type
  83 #define PKTIP           0x0800                          // IPv4 packet type
  84 #define PKTIPV6         0x86DD                          // IPv6 packet type
  85 #define PPPPAP          0xC023
  86 #define PPPCHAP         0xC223
  87 #define PPPLCP          0xC021
  88 #define PPPIPCP         0x8021
  89 #define PPPIPV6CP       0x8057
  90 #define PPPCCP          0x80FD
  91 #define PPPIP           0x0021
  92 #define PPPIPV6         0x0057
  93 #define PPPMP           0x003D
  94 #define MIN_IP_SIZE     0x19
  95
  96 enum {
  97         ConfigReq = 1,
  98         ConfigAck,
  99         ConfigNak,
 100         ConfigRej,
 101         TerminateReq,
 102         TerminateAck,
 103         CodeRej,
 104         ProtocolRej,
 105         EchoReq,
 106         EchoReply,
 107         DiscardRequest,
 108         IdentRequest
 109 };
 110
 111 enum {
 112         AccessRequest = 1,
 113         AccessAccept,
 114         AccessReject,
 115         AccountingRequest,
 116         AccountingResponse,
 117         AccessChallenge = 11,
 118         DisconnectRequest = 40,
 119         DisconnectACK,
 120         DisconnectNAK,
 121         CoARequest,
 122         CoAACK,
 123         CoANAK
 124 };
 125
 126 // PPP phases
 127 enum {
 128         Dead,
 129         Establish,
 130         Authenticate,
 131         Network,
 132         Terminate
 133 };
 134
 135 // PPP states
 136 enum {
 137         Initial,
 138         Starting,
 139         Closed,
 140         Stopped,
 141         Closing,
 142         Stopping,
 143         RequestSent,
 144         AckReceived,
 145         AckSent,
 146         Opened
 147 };
 148
 149 // reset state machine counters
 150 #define initialise_restart_count(_s, _fsm)                      \
 151         sess_local[_s]._fsm.conf_sent = sess_local[_s]._fsm.nak_sent
 152
 153 // stop timer on change to state where timer does not run
 154 #define change_state(_s, _fsm, _new) ({                         \
 155         if (_new != session[_s].ppp._fsm)                       \
 156         {                                                       \
 157                 switch (_new)                                   \
 158                 {                                               \
 159                 case Initial:                                   \
 160                 case Starting:                                  \
 161                 case Closed:                                    \
 162                 case Stopped:                                   \
 163                 case Opened:                                    \
 164                         sess_local[_s]._fsm.restart = 0;        \
 165                         initialise_restart_count(_s, _fsm);     \
 166                 }                                               \
 167                 session[_s].ppp._fsm = _new;                    \
 168                 cluster_send_session(_s);                       \
 169         }                                                       \
 170 })
 171
 172 // Types
 173 typedef uint16_t sessionidt;
 174 typedef uint16_t tunnelidt;
 175 typedef uint32_t clockt;
 176 typedef uint8_t hasht[16];
 177
 178 // CLI actions
 179 struct cli_session_actions {
 180         char action;
 181         in_addr_t snoop_ip;
 182         uint16_t snoop_port;
 183         int throttle_in;
 184         int throttle_out;
 185         int filter_in;
 186         int filter_out;
 187 };
 188
 189 #define CLI_SESS_KILL           0x01
 190 #define CLI_SESS_SNOOP          0x02
 191 #define CLI_SESS_NOSNOOP        0x04
 192 #define CLI_SESS_THROTTLE       0x08
 193 #define CLI_SESS_NOTHROTTLE     0x10
 194 #define CLI_SESS_FILTER         0x20
 195 #define CLI_SESS_NOFILTER       0x40
 196
 197 struct cli_tunnel_actions {
 198         char action;
 199 };
 200
 201 #define CLI_TUN_KILL            0x01
 202
 203 // structures
 204 typedef struct                  // route
 205 {
 206         in_addr_t ip;
 207         in_addr_t mask;
 208 }
 209 routet;
 210
 211 typedef struct controls         // control message
 212 {
 213         struct controls *next;  // next in queue
 214         uint16_t length;        // length
 215         uint8_t buf[MAXCONTROL];
 216 }
 217 controlt;
 218
 219 typedef struct
 220 {
 221         sessionidt next;                // next session in linked list
 222         sessionidt far;                 // far end session ID
 223         tunnelidt tunnel;               // near end tunnel ID
 224         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 225         struct {
 226                 uint8_t phase;          // PPP phase
 227                 uint8_t lcp:4;          //   LCP    state
 228                 uint8_t ipcp:4;         //   IPCP   state
 229                 uint8_t ipv6cp:4;       //   IPV6CP state
 230                 uint8_t ccp:4;          //   CCP    state
 231                 uint8_t pad;            // unused
 232         } ppp;
 233         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 234         int ip_pool_index;              // index to IP pool
 235         uint32_t unique_id;             // unique session id
 236         uint16_t nr;                    // next receive
 237         uint16_t ns;                    // next send
 238         uint32_t magic;                 // ppp magic number
 239         uint32_t pin, pout;             // packet counts
 240         uint32_t cin, cout;             // byte counts
 241         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 242         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 243         uint16_t throttle_in;           // upstream throttle rate (kbps)
 244         uint16_t throttle_out;          // downstream throttle rate
 245         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 246         uint8_t filter_out;             // output filter index
 247         uint16_t mru;                   // maximum receive unit
 248         clockt opened;                  // when started
 249         clockt die;                     // being closed, when to finally free
 250         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 251         in_addr_t dns1, dns2;           // DNS servers
 252         routet route[MAXROUTE];         // static routes
 253         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 254         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 255         int random_vector_length;
 256         uint8_t random_vector[MAXTEL];
 257         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 258         char called[MAXTEL];            // called number
 259         char calling[MAXTEL];           // calling number
 260         uint32_t tx_connect_speed;
 261         uint32_t rx_connect_speed;
 262         in_addr_t snoop_ip;             // Interception destination IP
 263         uint16_t snoop_port;            // Interception destination port
 264         uint8_t walled_garden;          // is this session gardened?
 265         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 266         struct in6_addr ipv6route;      // Static IPv6 route
 267         char reserved[11];              // Space to expand structure without changing HB_VERSION
 268 }
 269 sessiont;
 270
 271 #define AUTHPAP         1       // allow PAP
 272 #define AUTHCHAP        2       // allow CHAP
 273
 274 typedef struct
 275 {
 276         // packet counters
 277         uint32_t pin;
 278         uint32_t pout;
 279
 280         // byte counters
 281         uint32_t cin;
 282         uint32_t cout;
 283
 284         // PPP restart timer/counters
 285         struct {
 286                 time_t restart;
 287                 int conf_sent;
 288                 int nak_sent;
 289         } lcp, ipcp, ipv6cp, ccp;
 290
 291         // identifier for Protocol-Reject, Code-Reject
 292         uint8_t lcp_ident;
 293
 294         // authentication to use
 295         int lcp_authtype;
 296
 297         // our MRU
 298         uint16_t ppp_mru;
 299
 300         // DoS prevention
 301         clockt last_packet_out;
 302         uint32_t packets_out;
 303         uint32_t packets_dropped;
 304
 305         // RADIUS session in use
 306         uint16_t radius;
 307
 308         // interim RADIUS
 309         time_t last_interim;
 310 } sessionlocalt;
 311
 312 #define SESSIONPFC      1       // PFC negotiated flags
 313 #define SESSIONACFC     2       // ACFC negotiated flags
 314
 315 // 168 bytes per tunnel
 316 typedef struct
 317 {
 318         tunnelidt far;          // far end tunnel ID
 319         in_addr_t ip;           // Ip for far end
 320         uint16_t port;          // port for far end
 321         uint16_t window;        // Rx window
 322         uint16_t nr;            // next receive
 323         uint16_t ns;            // next send
 324         int state;              // current state (tunnelstate enum)
 325         clockt last;            // when last control message sent (used for resend timeout)
 326         clockt retry;           // when to try resending pending control
 327         clockt die;             // being closed, when to finally free
 328         clockt lastrec;         // when the last control message was received
 329         char hostname[128];     // tunnel hostname
 330         char vendor[128];       // LAC vendor
 331         uint8_t try;            // number of retrys on a control message
 332         uint16_t controlc;      // outstaind messages in queue
 333         controlt *controls;     // oldest message
 334         controlt *controle;     // newest message
 335 }
 336 tunnelt;
 337
 338 // 160 bytes per radius session
 339 typedef struct                  // outstanding RADIUS requests
 340 {
 341         sessionidt session;     // which session this applies to
 342         hasht auth;             // request authenticator
 343         clockt retry;           // when to try next
 344         char pass[129];         // password
 345         uint8_t id;             // ID for PPP response
 346         uint8_t try;            // which try we are on
 347         uint8_t state;          // state of radius requests
 348         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 349 }
 350 radiust;
 351
 352 typedef struct
 353 {
 354         in_addr_t       address;        // Host byte order..
 355         char            assigned;       // 1 if assigned, 0 if free
 356         sessionidt      session;
 357         clockt          last;           // last used
 358         char            user[129];      // user (try to have ip addresses persistent)
 359 }
 360 ippoolt;
 361
 362 #ifdef RINGBUFFER
 363 struct Tringbuffer
 364 {
 365         struct {
 366                 char level;
 367                 sessionidt session;
 368                 tunnelidt tunnel;
 369                 char message[MAX_LOG_LENGTH];
 370         } buffer[RINGBUFFER_SIZE];
 371         int head;
 372         int tail;
 373 };
 374 #endif
 375
 376 /*
 377  * Possible tunnel states
 378  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 379  */
 380 enum
 381 {
 382         TUNNELFREE,             // Not in use
 383         TUNNELOPEN,             // Active tunnel
 384         TUNNELDIE,              // Currently closing
 385         TUNNELOPENING,          // Busy opening
 386         TUNNELUNDEF,            // Undefined
 387 };
 388
 389 enum
 390 {
 391         RADIUSNULL,             // Not in use
 392         RADIUSCHAP,             // sending CHAP down PPP
 393         RADIUSAUTH,             // sending auth to RADIUS server
 394         RADIUSSTART,            // sending start accounting to RADIUS server
 395         RADIUSSTOP,             // sending stop accounting to RADIUS server
 396         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 397         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 398 };
 399
 400 struct Tstats
 401 {
 402     time_t      start_time;
 403     time_t      last_reset;
 404
 405     uint32_t    tun_rx_packets;
 406     uint32_t    tun_tx_packets;
 407     uint32_t    tun_rx_bytes;
 408     uint32_t    tun_tx_bytes;
 409     uint32_t    tun_rx_errors;
 410     uint32_t    tun_tx_errors;
 411     uint32_t    tun_rx_dropped;
 412
 413     uint32_t    tunnel_rx_packets;
 414     uint32_t    tunnel_tx_packets;
 415     uint32_t    tunnel_rx_bytes;
 416     uint32_t    tunnel_tx_bytes;
 417     uint32_t    tunnel_rx_errors;
 418     uint32_t    tunnel_tx_errors;
 419
 420     uint32_t    tunnel_retries;
 421     uint32_t    radius_retries;
 422
 423     uint32_t    arp_sent;
 424
 425     uint32_t    packets_snooped;
 426
 427     uint32_t    tunnel_created;
 428     uint32_t    session_created;
 429     uint32_t    tunnel_timeout;
 430     uint32_t    session_timeout;
 431     uint32_t    radius_timeout;
 432     uint32_t    radius_overflow;
 433     uint32_t    tunnel_overflow;
 434     uint32_t    session_overflow;
 435
 436     uint32_t    ip_allocated;
 437     uint32_t    ip_freed;
 438
 439     uint32_t    c_forwarded;
 440     uint32_t    recv_forward;
 441
 442     uint32_t    select_called;
 443     uint32_t    multi_read_used;
 444     uint32_t    multi_read_exceeded;
 445
 446 #ifdef STATISTICS
 447     uint32_t    call_processtun;
 448     uint32_t    call_processipout;
 449     uint32_t    call_processipv6out;
 450     uint32_t    call_processudp;
 451     uint32_t    call_sessionbyip;
 452     uint32_t    call_sessionbyipv6;
 453     uint32_t    call_sessionbyuser;
 454     uint32_t    call_sendarp;
 455     uint32_t    call_sendipcp;
 456     uint32_t    call_sendipv6cp;
 457     uint32_t    call_processipv6cp;
 458     uint32_t    call_tunnelsend;
 459     uint32_t    call_sessionkill;
 460     uint32_t    call_sessionshutdown;
 461     uint32_t    call_tunnelkill;
 462     uint32_t    call_tunnelshutdown;
 463     uint32_t    call_assign_ip_address;
 464     uint32_t    call_free_ip_address;
 465     uint32_t    call_dump_acct_info;
 466     uint32_t    call_sessionsetup;
 467     uint32_t    call_processpap;
 468     uint32_t    call_processchap;
 469     uint32_t    call_processlcp;
 470     uint32_t    call_processipcp;
 471     uint32_t    call_processipin;
 472     uint32_t    call_processipv6in;
 473     uint32_t    call_processccp;
 474     uint32_t    call_sendchap;
 475     uint32_t    call_processrad;
 476     uint32_t    call_radiussend;
 477     uint32_t    call_radiusretry;
 478     uint32_t    call_random_data;
 479 #endif
 480 };
 481
 482 #ifdef STATISTICS
 483
 484 #ifdef STAT_CALLS
 485 #define CSTAT(x)        STAT(call_ ## x)
 486 #else
 487 #define CSTAT(x)
 488 #endif
 489
 490 #define STAT(x)         (_statistics->x++)
 491 #define INC_STAT(x,y)   (_statistics->x += (y))
 492 #define GET_STAT(x)     (_statistics->x)
 493 #define SET_STAT(x, y)  (_statistics->x = (y))
 494 #else
 495 #define CSTAT(x)
 496 #define STAT(x)
 497 #define INC_STAT(x,y)
 498 #define GET_STAT(x)     0
 499 #define SET_STAT(x, y)
 500 #endif
 501
 502 typedef struct
 503 {
 504         int             debug;                          // debugging level
 505         time_t          start_time;                     // time when l2tpns was started
 506         char            bandwidth[256];                 // current bandwidth
 507         char            pid_file[256];                  // file to write PID to on startup
 508         int             wrote_pid;
 509         clockt          current_time;                   // 1/10ths of a second since the process started.
 510                                                         // means that we can only run a given process
 511                                                         // for 13 years without re-starting!
 512
 513         char            config_file[128];
 514         int             reload_config;                  // flag to re-read config (set by cli)
 515         int             multi_read_count;               // amount of packets to read per fd in processing loop
 516
 517         char            tundevice[10];                  // tun device name
 518         char            log_filename[128];
 519
 520         char            l2tp_secret[64];                // L2TP shared secret
 521         int             l2tp_mtu;                       // MTU of interface used for L2TP
 522
 523         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 524
 525         int             ppp_restart_time;               // timeout for PPP restart
 526         int             ppp_max_configure;              // max lcp configure requests to send
 527         int             ppp_max_failure;                // max lcp configure naks to send
 528
 529         char            radiussecret[64];
 530         int             radius_accounting;
 531         int             radius_interim;
 532         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 533         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 534         uint8_t         numradiusservers;               // radius server count
 535
 536         uint16_t        radius_dae_port;                // local port for radius dae
 537
 538         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 539         int             radius_authtypes;
 540         int             radius_authprefer;
 541
 542         int             allow_duplicate_users;          // allow multiple logins with the same username
 543
 544         in_addr_t       default_dns1, default_dns2;
 545
 546         unsigned long   rl_rate;                        // default throttle rate
 547         int             num_tbfs;                       // number of throttle buckets
 548
 549         char            accounting_dir[128];
 550         in_addr_t       bind_address;
 551         in_addr_t       peer_address;
 552         int             send_garp;                      // Set to true to garp for vip address on startup
 553
 554         int             target_uid;
 555         int             dump_speed;
 556         char            plugins[64][MAXPLUGINS];
 557         char            old_plugins[64][MAXPLUGINS];
 558
 559         int             next_tbf;                       // Next HTB id available to use
 560         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 561                                                         // policy for this process.
 562         int             lock_pages;                     // Lock pages into memory.
 563         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 564         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 565
 566         in_addr_t       cluster_address;                // Multicast address of cluster.
 567                                                         // Send to this address to have everyone hear.
 568         char            cluster_interface[64];          // Which interface to listen for multicast on.
 569         int             cluster_iam_master;             // Are we the cluster master???
 570         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 571         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 572                                                         // Zero if i am the cluster master.
 573         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 574                                                         // (or the seq number we're next expecting if we're a slave).
 575         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 576         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 577         int             cluster_highest_sessionid;
 578         int             cluster_highest_tunnelid;
 579         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 580         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 581         int             cluster_num_changes;            // Number of changes queued.
 582
 583         int             cluster_mcast_ttl;              // TTL for multicast packets
 584         int             cluster_hb_interval;            // How often to send a heartbeat.
 585         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 586         uint64_t        cluster_table_version;          // # state changes processed by cluster
 587
 588         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 589
 590
 591         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 592                                                         // slaves is less than this value.
 593
 594 #ifdef BGP
 595 #define BGP_NUM_PEERS   2
 596         uint16_t as_number;
 597         struct {
 598                 char name[64];
 599                 uint16_t as;
 600                 int keepalive;
 601                 int hold;
 602         } neighbour[BGP_NUM_PEERS];
 603 #endif
 604 } configt;
 605
 606 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 607 typedef struct
 608 {
 609         char *key;
 610         int offset;
 611         int size;
 612         enum config_typet type;
 613 } config_descriptt;
 614
 615 typedef struct
 616 {
 617         uint8_t op;     // operation
 618 #define FILTER_PORT_OP_NONE     0 // all ports match
 619 #define FILTER_PORT_OP_EQ       1
 620 #define FILTER_PORT_OP_NEQ      2
 621 #define FILTER_PORT_OP_GT       3
 622 #define FILTER_PORT_OP_LT       4
 623 #define FILTER_PORT_OP_RANGE    5
 624         uint16_t port;  // port (host byte order)
 625         uint16_t port2; // range
 626 } ip_filter_portt;
 627
 628 typedef struct
 629 {
 630         int action;             // permit/deny
 631 #define FILTER_ACTION_DENY      1
 632 #define FILTER_ACTION_PERMIT    2
 633         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 634         in_addr_t src_ip;       // source ip (network byte order)
 635         in_addr_t src_wild;
 636         ip_filter_portt src_ports;
 637         in_addr_t dst_ip;       // dest ip
 638         in_addr_t dst_wild;
 639         ip_filter_portt dst_ports;
 640         uint8_t frag;           // apply to non-initial fragments
 641         uint8_t tcp_flag_op;    // match type: any, all, established
 642 #define FILTER_FLAG_OP_ANY      1
 643 #define FILTER_FLAG_OP_ALL      2
 644 #define FILTER_FLAG_OP_EST      3
 645         uint8_t tcp_sflags;     // flags set
 646         uint8_t tcp_cflags;     // flags clear
 647         uint32_t counter;       // match count
 648 } ip_filter_rulet;
 649
 650 #define TCP_FLAG_FIN    0x01
 651 #define TCP_FLAG_SYN    0x02
 652 #define TCP_FLAG_RST    0x04
 653 #define TCP_FLAG_PSH    0x08
 654 #define TCP_FLAG_ACK    0x10
 655 #define TCP_FLAG_URG    0x20
 656
 657 #define MAXFILTER               32
 658 #define MAXFILTER_RULES         32
 659 typedef struct
 660 {
 661         char name[32];          // ACL name
 662         int extended;           // type: 0 = standard, 1 = extended
 663         ip_filter_rulet rules[MAXFILTER_RULES];
 664         int used;               // session ref count
 665 } ip_filtert;
 666
 667 // arp.c
 668 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 669
 670
 671 // ppp.c
 672 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 673 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 674 void lcp_open(sessionidt s, tunnelidt t);
 675 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 676 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 677 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 678 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 679 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 680 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
 681 void sendchap(sessionidt s, tunnelidt t);
 682 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
 683 void sendlcp(sessionidt s, tunnelidt t);
 684 void send_ipin(sessionidt s, uint8_t *buf, int len);
 685 void sendccp(sessionidt s, tunnelidt t);
 686
 687
 688 // radius.c
 689 void initrad(void);
 690 void radiussend(uint16_t r, uint8_t state);
 691 void processrad(uint8_t *buf, int len, char socket_index);
 692 void radiusretry(uint16_t r);
 693 uint16_t radiusnew(sessionidt s);
 694 void radiusclear(uint16_t r, sessionidt s);
 695 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
 696
 697
 698 // l2tpns.c
 699 clockt backoff(uint8_t try);
 700 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
 701 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 702 sessionidt sessionbyip(in_addr_t ip);
 703 sessionidt sessionbyipv6(struct in6_addr ip);
 704 sessionidt sessionbyuser(char *username);
 705 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 706 void random_data(uint8_t *buf, int len);
 707 void sessionkill(sessionidt s, char *reason);
 708 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 709 void filter_session(sessionidt s, int filter_in, int filter_out);
 710 void send_garp(in_addr_t ip);
 711 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 712 int tun_write(uint8_t *data, int size);
 713 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
 714 void sendipcp(sessionidt s, tunnelidt t);
 715 void sendipv6cp(sessionidt s, tunnelidt t);
 716 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 717 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
 718 int find_filter(char const *name, size_t len);
 719 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 720 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 721 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 722 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 723
 724 #undef LOG
 725 #undef LOG_HEX
 726 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 727 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 728
 729 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 730 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
 731
 732 int sessionsetup(sessionidt s, tunnelidt t);
 733 int run_plugins(int plugin_type, void *data);
 734 void rebuild_address_pool(void);
 735 void throttle_session(sessionidt s, int rate_in, int rate_out);
 736 int load_session(sessionidt, sessiont *);
 737 void become_master(void);       // We're the master; kick off any required master initializations.
 738
 739
 740 // cli.c
 741 void init_cli(char *hostname);
 742 void cli_do_file(FILE *fh);
 743 void cli_do(int sockfd);
 744 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 745
 746
 747 // icmp.c
 748 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
 749
 750
 751 extern tunnelt *tunnel;
 752 extern sessiont *session;
 753 extern sessionlocalt *sess_local;
 754 extern ippoolt *ip_address_pool;
 755 #define sessionfree (session[0].next)
 756
 757 #define log_backtrace(count, max) \
 758 if (count++ < max) { \
 759         void *array[20]; \
 760         char **strings; \
 761         int size, i; \
 762         LOG(0, 0, t, "Backtrace follows:\n"); \
 763         size = backtrace(array, 10); \
 764         strings = backtrace_symbols(array, size); \
 765         if (strings) for (i = 0; i < size; i++) \
 766         { \
 767                 LOG(0, 0, t, " %s\n", strings[i]); \
 768         } \
 769         free(strings); \
 770 }
 771
 772
 773 extern configt *config;
 774 extern time_t basetime;         // Time when this process started.
 775 extern time_t time_now;         // Seconds since EPOCH.
 776 extern char main_quit;
 777 extern uint32_t last_id;
 778 extern struct Tstats *_statistics;
 779 extern in_addr_t my_address;
 780 extern int clifd;
 781 extern int epollfd;
 782
 783 struct event_data {
 784         enum {
 785                 FD_TYPE_CLI,
 786                 FD_TYPE_CLUSTER,
 787                 FD_TYPE_TUN,
 788                 FD_TYPE_UDP,
 789                 FD_TYPE_CONTROL,
 790                 FD_TYPE_DAE,
 791                 FD_TYPE_RADIUS,
 792                 FD_TYPE_BGP,
 793         } type;
 794         int index; // for RADIUS, BGP
 795 };
 796
 797 #define TIME (config->current_time)
 798
 799 extern uint16_t MRU;
 800 extern uint16_t MSS;
 801
 802 // macros for handling help in cli commands
 803 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 804 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 805
 806 // CVS identifiers (for "show version file")
 807 extern char const *cvs_id_arp;
 808 extern char const *cvs_id_cli;
 809 extern char const *cvs_id_cluster;
 810 extern char const *cvs_id_constants;
 811 extern char const *cvs_id_control;
 812 extern char const *cvs_id_icmp;
 813 extern char const *cvs_id_l2tpns;
 814 extern char const *cvs_id_ll;
 815 extern char const *cvs_id_md5;
 816 extern char const *cvs_id_ppp;
 817 extern char const *cvs_id_radius;
 818 extern char const *cvs_id_tbf;
 819 extern char const *cvs_id_util;
 820
 821 #endif /* __L2TPNS_H__ */