l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.78 2005-06-12 06:10:29 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 "2.1.1"
  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 PKTARP          0x0806          // ARP packet type
  80 #define PKTIP           0x0800          // IPv4 packet type
  81 #define PKTIPV6         0x86DD          // IPv6 packet type
  82 #define PPPPAP          0xC023
  83 #define PPPCHAP         0xC223
  84 #define PPPLCP          0xC021
  85 #define PPPIPCP         0x8021
  86 #define PPPIPV6CP       0x8057
  87 #define PPPCCP          0x80FD
  88 #define PPPIP           0x0021
  89 #define PPPIPV6         0x0057
  90 #define PPPMP           0x003D
  91 #define MIN_IP_SIZE     0x19
  92
  93 enum {
  94         ConfigReq = 1,
  95         ConfigAck,
  96         ConfigNak,
  97         ConfigRej,
  98         TerminateReq,
  99         TerminateAck,
 100         CodeRej,
 101         ProtocolRej,
 102         EchoReq,
 103         EchoReply,
 104         DiscardRequest,
 105         IdentRequest
 106 };
 107
 108 enum {
 109         AccessRequest = 1,
 110         AccessAccept,
 111         AccessReject,
 112         AccountingRequest,
 113         AccountingResponse,
 114         AccessChallenge = 11
 115 };
 116
 117 // Types
 118 typedef uint16_t sessionidt;
 119 typedef uint16_t tunnelidt;
 120 typedef uint32_t clockt;
 121 typedef uint8_t hasht[16];
 122
 123 // CLI actions
 124 struct cli_session_actions {
 125         char action;
 126         in_addr_t snoop_ip;
 127         uint16_t snoop_port;
 128         int throttle_in;
 129         int throttle_out;
 130         int filter_in;
 131         int filter_out;
 132 };
 133
 134 #define CLI_SESS_KILL           0x01
 135 #define CLI_SESS_SNOOP          0x02
 136 #define CLI_SESS_NOSNOOP        0x04
 137 #define CLI_SESS_THROTTLE       0x08
 138 #define CLI_SESS_NOTHROTTLE     0x10
 139 #define CLI_SESS_FILTER         0x20
 140 #define CLI_SESS_NOFILTER       0x40
 141
 142 struct cli_tunnel_actions {
 143         char action;
 144 };
 145
 146 #define CLI_TUN_KILL            0x01
 147
 148 // structures
 149 typedef struct                  // route
 150 {
 151         in_addr_t ip;
 152         in_addr_t mask;
 153 }
 154 routet;
 155
 156 typedef struct controls         // control message
 157 {
 158         struct controls *next;  // next in queue
 159         uint16_t length;        // length
 160         uint8_t buf[MAXCONTROL];
 161 }
 162 controlt;
 163
 164 typedef struct
 165 {
 166         sessionidt next;                // next session in linked list
 167         sessionidt far;                 // far end session ID
 168         tunnelidt tunnel;               // near end tunnel ID
 169         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 170         uint8_t flags;                  // Various session flags.
 171         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 172         int ip_pool_index;              // index to IP pool
 173         uint32_t unique_id;             // unique session id
 174         uint16_t nr;                    // next receive
 175         uint16_t ns;                    // next send
 176         uint32_t magic;                 // ppp magic number
 177         uint32_t pin, pout;             // packet counts
 178         uint32_t cin, cout;             // byte counts
 179         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 180         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 181         uint16_t throttle_in;           // upstream throttle rate (kbps)
 182         uint16_t throttle_out;          // downstream throttle rate
 183         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 184         uint8_t filter_out;             // output filter index
 185         uint16_t mru;                   // maximum receive unit
 186         clockt opened;                  // when started
 187         clockt die;                     // being closed, when to finally free
 188         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 189         in_addr_t dns1, dns2;           // DNS servers
 190         routet route[MAXROUTE];         // static routes
 191         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 192         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 193         int random_vector_length;
 194         char random_vector[MAXTEL];
 195         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 196         char called[MAXTEL];            // called number
 197         char calling[MAXTEL];           // calling number
 198         uint32_t tx_connect_speed;
 199         uint32_t rx_connect_speed;
 200         in_addr_t snoop_ip;             // Interception destination IP
 201         uint16_t snoop_port;            // Interception destination port
 202         uint8_t walled_garden;          // is this session gardened?
 203         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 204         struct in6_addr ipv6route;      // Static IPv6 route
 205         char reserved[16];              // Space to expand structure without changing HB_VERSION
 206 }
 207 sessiont;
 208
 209 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 210 #define SF_LCP_ACKED    2       // LCP negotiated
 211 #define SF_CCP_ACKED    4       // CCP negotiated
 212 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 213 #define SF_IPV6_NACKED  16      // IPv6 rejected
 214 #define SF_IPV6_ROUTED  32      // advertised v6 route
 215
 216 #define AUTHPAP         1       // allow PAP
 217 #define AUTHCHAP        2       // allow CHAP
 218
 219 typedef struct
 220 {
 221         // packet counters
 222         uint32_t pin;
 223         uint32_t pout;
 224
 225         // byte counters
 226         uint32_t cin;
 227         uint32_t cout;
 228
 229         // DoS prevention
 230         clockt last_packet_out;
 231         uint32_t packets_out;
 232         uint32_t packets_dropped;
 233
 234         // RADIUS session in use
 235         uint16_t radius;
 236
 237         // interim RADIUS
 238         time_t last_interim;
 239 } sessionlocalt;
 240
 241 #define SESSIONPFC      1       // PFC negotiated flags
 242 #define SESSIONACFC     2       // ACFC negotiated flags
 243
 244 // 168 bytes per tunnel
 245 typedef struct
 246 {
 247         tunnelidt far;          // far end tunnel ID
 248         in_addr_t ip;           // Ip for far end
 249         uint16_t port;          // port for far end
 250         uint16_t window;        // Rx window
 251         uint16_t nr;            // next receive
 252         uint16_t ns;            // next send
 253         int state;              // current state (tunnelstate enum)
 254         clockt last;            // when last control message sent (used for resend timeout)
 255         clockt retry;           // when to try resenting pending control
 256         clockt die;             // being closed, when to finally free
 257         clockt lastrec;         // when the last control message was received
 258         char hostname[128];     // tunnel hostname
 259         char vendor[128];       // LAC vendor
 260         uint8_t try;            // number of retrys on a control message
 261         uint16_t controlc;      // outstaind messages in queue
 262         controlt *controls;     // oldest message
 263         controlt *controle;     // newest message
 264 }
 265 tunnelt;
 266
 267 // 180 bytes per radius session
 268 typedef struct                  // outstanding RADIUS requests
 269 {
 270         sessionidt session;     // which session this applies to
 271         hasht auth;             // request authenticator
 272         clockt retry;           // when to try next
 273         char calling[MAXTEL];   // calling number
 274         char pass[129];         // password
 275         uint8_t id;             // ID for PPP response
 276         uint8_t try;            // which try we are on
 277         uint8_t state;          // state of radius requests
 278         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 279 }
 280 radiust;
 281
 282 typedef struct
 283 {
 284         in_addr_t       address;        // Host byte order..
 285         char            assigned;       // 1 if assigned, 0 if free
 286         sessionidt      session;
 287         clockt          last;           // last used
 288         char            user[129];      // user (try to have ip addresses persistent)
 289 }
 290 ippoolt;
 291
 292 #ifdef RINGBUFFER
 293 struct Tringbuffer
 294 {
 295         struct {
 296                 char level;
 297                 sessionidt session;
 298                 tunnelidt tunnel;
 299                 char message[MAX_LOG_LENGTH];
 300         } buffer[RINGBUFFER_SIZE];
 301         int head;
 302         int tail;
 303 };
 304 #endif
 305
 306 /*
 307  * Possible tunnel states
 308  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 309  */
 310 enum
 311 {
 312         TUNNELFREE,             // Not in use
 313         TUNNELOPEN,             // Active tunnel
 314         TUNNELDIE,              // Currently closing
 315         TUNNELOPENING,          // Busy opening
 316         TUNNELUNDEF,            // Undefined
 317 };
 318
 319 enum
 320 {
 321         RADIUSNULL,             // Not in use
 322         RADIUSCHAP,             // sending CHAP down PPP
 323         RADIUSAUTH,             // sending auth to RADIUS server
 324         RADIUSIPCP,             // sending IPCP to end user
 325         RADIUSSTART,            // sending start accounting to RADIUS server
 326         RADIUSSTOP,             // sending stop accounting to RADIUS server
 327         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 328         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 329 };
 330
 331 struct Tstats
 332 {
 333     time_t      start_time;
 334     time_t      last_reset;
 335
 336     uint32_t    tun_rx_packets;
 337     uint32_t    tun_tx_packets;
 338     uint32_t    tun_rx_bytes;
 339     uint32_t    tun_tx_bytes;
 340     uint32_t    tun_rx_errors;
 341     uint32_t    tun_tx_errors;
 342     uint32_t    tun_rx_dropped;
 343
 344     uint32_t    tunnel_rx_packets;
 345     uint32_t    tunnel_tx_packets;
 346     uint32_t    tunnel_rx_bytes;
 347     uint32_t    tunnel_tx_bytes;
 348     uint32_t    tunnel_rx_errors;
 349     uint32_t    tunnel_tx_errors;
 350
 351     uint32_t    tunnel_retries;
 352     uint32_t    radius_retries;
 353
 354     uint32_t    arp_sent;
 355
 356     uint32_t    packets_snooped;
 357
 358     uint32_t    tunnel_created;
 359     uint32_t    session_created;
 360     uint32_t    tunnel_timeout;
 361     uint32_t    session_timeout;
 362     uint32_t    radius_timeout;
 363     uint32_t    radius_overflow;
 364     uint32_t    tunnel_overflow;
 365     uint32_t    session_overflow;
 366
 367     uint32_t    ip_allocated;
 368     uint32_t    ip_freed;
 369
 370     uint32_t    c_forwarded;
 371     uint32_t    recv_forward;
 372
 373     uint32_t    select_called;
 374     uint32_t    multi_read_used;
 375     uint32_t    multi_read_exceeded;
 376
 377 #ifdef STATISTICS
 378     uint32_t    call_processtun;
 379     uint32_t    call_processipout;
 380     uint32_t    call_processipv6out;
 381     uint32_t    call_processudp;
 382     uint32_t    call_sessionbyip;
 383     uint32_t    call_sessionbyipv6;
 384     uint32_t    call_sessionbyuser;
 385     uint32_t    call_sendarp;
 386     uint32_t    call_sendipcp;
 387     uint32_t    call_processipv6cp;
 388     uint32_t    call_tunnelsend;
 389     uint32_t    call_sessionkill;
 390     uint32_t    call_sessionshutdown;
 391     uint32_t    call_tunnelkill;
 392     uint32_t    call_tunnelshutdown;
 393     uint32_t    call_assign_ip_address;
 394     uint32_t    call_free_ip_address;
 395     uint32_t    call_dump_acct_info;
 396     uint32_t    call_sessionsetup;
 397     uint32_t    call_processpap;
 398     uint32_t    call_processchap;
 399     uint32_t    call_processlcp;
 400     uint32_t    call_processipcp;
 401     uint32_t    call_processipin;
 402     uint32_t    call_processipv6in;
 403     uint32_t    call_processccp;
 404     uint32_t    call_sendchap;
 405     uint32_t    call_processrad;
 406     uint32_t    call_radiussend;
 407     uint32_t    call_radiusretry;
 408     uint32_t    call_random_data;
 409 #endif
 410 };
 411
 412 #ifdef STATISTICS
 413
 414 #ifdef STAT_CALLS
 415 #define CSTAT(x)        STAT(call_ ## x)
 416 #else
 417 #define CSTAT(x)
 418 #endif
 419
 420 #define STAT(x)         (_statistics->x++)
 421 #define INC_STAT(x,y)   (_statistics->x += (y))
 422 #define GET_STAT(x)     (_statistics->x)
 423 #define SET_STAT(x, y)  (_statistics->x = (y))
 424 #else
 425 #define CSTAT(x)
 426 #define STAT(x)
 427 #define INC_STAT(x,y)
 428 #define GET_STAT(x)     0
 429 #define SET_STAT(x, y)
 430 #endif
 431
 432 typedef struct
 433 {
 434         int             debug;                          // debugging level
 435         time_t          start_time;                     // time when l2tpns was started
 436         char            bandwidth[256];                 // current bandwidth
 437         char            pid_file[256];                  // file to write PID to on startup
 438         int             wrote_pid;
 439         clockt          current_time;                   // 1/10ths of a second since the process started.
 440                                                         // means that we can only run a given process
 441                                                         // for 13 years without re-starting!
 442
 443         char            config_file[128];
 444         int             reload_config;                  // flag to re-read config (set by cli)
 445         int             multi_read_count;               // amount of packets to read per fd in processing loop
 446
 447         char            tundevice[10];                  // tun device name
 448         char            log_filename[128];
 449         char            l2tpsecret[64];
 450
 451         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 452
 453         char            radiussecret[64];
 454         int             radius_accounting;
 455         int             radius_interim;
 456         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 457         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 458         uint8_t         numradiusservers;               // radius server count
 459
 460         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 461         int             radius_authtypes;
 462         int             radius_authprefer;
 463
 464         int             allow_duplicate_users;          // allow multiple logins with the same username
 465
 466         in_addr_t       default_dns1, default_dns2;
 467
 468         unsigned long   rl_rate;                        // default throttle rate
 469         int             num_tbfs;                       // number of throttle buckets
 470
 471         char            accounting_dir[128];
 472         in_addr_t       bind_address;
 473         in_addr_t       peer_address;
 474         int             send_garp;                      // Set to true to garp for vip address on startup
 475
 476         int             target_uid;
 477         int             dump_speed;
 478         char            plugins[64][MAXPLUGINS];
 479         char            old_plugins[64][MAXPLUGINS];
 480
 481         int             next_tbf;                       // Next HTB id available to use
 482         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 483                                                         // policy for this process.
 484         int             lock_pages;                     // Lock pages into memory.
 485         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 486         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 487
 488         in_addr_t       cluster_address;                // Multicast address of cluster.
 489                                                         // Send to this address to have everyone hear.
 490         char            cluster_interface[64];          // Which interface to listen for multicast on.
 491         int             cluster_iam_master;             // Are we the cluster master???
 492         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 493         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 494                                                         // Zero if i am the cluster master.
 495         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 496                                                         // (or the seq number we're next expecting if we're a slave).
 497         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 498         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 499         int             cluster_highest_sessionid;
 500         int             cluster_highest_tunnelid;
 501         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 502         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 503         int             cluster_num_changes;            // Number of changes queued.
 504
 505         int             cluster_hb_interval;            // How often to send a heartbeat.
 506         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 507         uint64_t        cluster_table_version;          // # state changes processed by cluster
 508
 509         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 510
 511
 512         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 513                                                         // slaves is less than this value.
 514
 515 #ifdef BGP
 516 #define BGP_NUM_PEERS   2
 517         uint16_t as_number;
 518         struct {
 519                 char name[64];
 520                 uint16_t as;
 521                 int keepalive;
 522                 int hold;
 523         } neighbour[BGP_NUM_PEERS];
 524 #endif
 525 } configt;
 526
 527 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 528 typedef struct
 529 {
 530         char *key;
 531         int offset;
 532         int size;
 533         enum config_typet type;
 534 } config_descriptt;
 535
 536 typedef struct
 537 {
 538         uint8_t op;     // operation
 539 #define FILTER_PORT_OP_NONE     0 // all ports match
 540 #define FILTER_PORT_OP_EQ       1
 541 #define FILTER_PORT_OP_NEQ      2
 542 #define FILTER_PORT_OP_GT       3
 543 #define FILTER_PORT_OP_LT       4
 544 #define FILTER_PORT_OP_RANGE    5
 545         uint16_t port;  // port (host byte order)
 546         uint16_t port2; // range
 547 } ip_filter_portt;
 548
 549 typedef struct
 550 {
 551         int action;             // permit/deny
 552 #define FILTER_ACTION_DENY      1
 553 #define FILTER_ACTION_PERMIT    2
 554         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 555         in_addr_t src_ip;       // source ip (network byte order)
 556         in_addr_t src_wild;
 557         ip_filter_portt src_ports;
 558         in_addr_t dst_ip;       // dest ip
 559         in_addr_t dst_wild;
 560         ip_filter_portt dst_ports;
 561         uint8_t frag;           // apply to non-initial fragments
 562         uint8_t tcp_flag_op;    // match type: any, all, established
 563 #define FILTER_FLAG_OP_ANY      1
 564 #define FILTER_FLAG_OP_ALL      2
 565 #define FILTER_FLAG_OP_EST      3
 566         uint8_t tcp_sflags;     // flags set
 567         uint8_t tcp_cflags;     // flags clear
 568         uint32_t counter;       // match count
 569 } ip_filter_rulet;
 570
 571 #define TCP_FLAG_FIN    0x01
 572 #define TCP_FLAG_SYN    0x02
 573 #define TCP_FLAG_RST    0x04
 574 #define TCP_FLAG_PSH    0x08
 575 #define TCP_FLAG_ACK    0x10
 576 #define TCP_FLAG_URG    0x20
 577
 578 #define MAXFILTER               32
 579 #define MAXFILTER_RULES         32
 580 typedef struct
 581 {
 582         char name[32];          // ACL name
 583         int extended;           // type: 0 = standard, 1 = extended
 584         ip_filter_rulet rules[MAXFILTER_RULES];
 585         int used;               // session ref count
 586 } ip_filtert;
 587
 588 // arp.c
 589 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 590
 591
 592 // ppp.c
 593 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 594 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 595 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 596 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 597 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 598 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 599 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 600 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 601 void sendchap(tunnelidt t, sessionidt s);
 602 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 603 void sendlcp(tunnelidt t, sessionidt s, int authtype);
 604 void send_ipin(sessionidt s, uint8_t *buf, int len);
 605
 606
 607 // radius.c
 608 void initrad(void);
 609 void radiussend(uint16_t r, uint8_t state);
 610 void processrad(uint8_t *buf, int len, char socket_index);
 611 void radiusretry(uint16_t r);
 612 uint16_t radiusnew(sessionidt s);
 613 void radiusclear(uint16_t r, sessionidt s);
 614
 615
 616 // l2tpns.c
 617 clockt backoff(uint8_t try);
 618 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 619 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 620 sessionidt sessionbyip(in_addr_t ip);
 621 sessionidt sessionbyipv6(struct in6_addr ip);
 622 sessionidt sessionbyuser(char *username);
 623 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 624 void random_data(uint8_t *buf, int len);
 625 void sessionkill(sessionidt s, char *reason);
 626 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 627 void send_garp(in_addr_t ip);
 628 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 629 void sendipcp(tunnelidt t, sessionidt s);
 630 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 631 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 632 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 633 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 634 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 635 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 636
 637 #undef LOG
 638 #undef LOG_HEX
 639 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 640 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 641
 642 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 643 void _log_hex(int level, const char *title, const char *data, int maxsize);
 644
 645 int sessionsetup(tunnelidt t, sessionidt s);
 646 int run_plugins(int plugin_type, void *data);
 647 void rebuild_address_pool(void);
 648 void throttle_session(sessionidt s, int rate_in, int rate_out);
 649 int load_session(sessionidt, sessiont *);
 650 void become_master(void);       // We're the master; kick off any required master initializations.
 651
 652
 653 // cli.c
 654 void init_cli(char *hostname);
 655 void cli_do_file(FILE *fh);
 656 void cli_do(int sockfd);
 657 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 658
 659
 660 // icmp.c
 661 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 662
 663
 664 extern tunnelt *tunnel;
 665 extern sessiont *session;
 666 extern sessionlocalt *sess_local;
 667 extern ippoolt *ip_address_pool;
 668 #define sessionfree (session[0].next)
 669
 670 #define log_backtrace(count, max) \
 671 if (count++ < max) { \
 672         void *array[20]; \
 673         char **strings; \
 674         int size, i; \
 675         LOG(0, 0, t, "Backtrace follows:\n"); \
 676         size = backtrace(array, 10); \
 677         strings = backtrace_symbols(array, size); \
 678         if (strings) for (i = 0; i < size; i++) \
 679         { \
 680                 LOG(0, 0, t, " %s\n", strings[i]); \
 681         } \
 682         free(strings); \
 683 }
 684
 685
 686 extern configt *config;
 687 extern time_t basetime;         // Time when this process started.
 688 extern time_t time_now;         // Seconds since EPOCH.
 689 extern char main_quit;
 690 extern uint32_t last_id;
 691 extern struct Tstats *_statistics;
 692 extern in_addr_t my_address;
 693 extern int tun_write(uint8_t *data, int size);
 694 extern int clifd;
 695 extern int epollfd;
 696
 697 struct event_data {
 698         enum {
 699                 FD_TYPE_CONTROL,
 700                 FD_TYPE_CLI,
 701                 FD_TYPE_UDP,
 702                 FD_TYPE_TUN,
 703                 FD_TYPE_CLUSTER,
 704                 FD_TYPE_RADIUS,
 705                 FD_TYPE_BGP,
 706         } type;
 707         int index; // for RADIUS, BGP
 708 };
 709
 710 #define TIME (config->current_time)
 711
 712 // macros for handling help in cli commands
 713 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 714 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 715
 716 // CVS identifiers (for "show version file")
 717 extern char const *cvs_id_arp;
 718 extern char const *cvs_id_cli;
 719 extern char const *cvs_id_cluster;
 720 extern char const *cvs_id_constants;
 721 extern char const *cvs_id_control;
 722 extern char const *cvs_id_icmp;
 723 extern char const *cvs_id_l2tpns;
 724 extern char const *cvs_id_ll;
 725 extern char const *cvs_id_md5;
 726 extern char const *cvs_id_ppp;
 727 extern char const *cvs_id_radius;
 728 extern char const *cvs_id_tbf;
 729 extern char const *cvs_id_util;
 730
 731 #endif /* __L2TPNS_H__ */