l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.59 2005/03/10 05:46:55 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 "2.1.0"
  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    5
  26 #define RADIUS_MASK     ((unsigned short)(((unsigned short)~0) >> (16 - RADIUS_SHIFT)))
  27 #define MAXRADIUS       ((unsigned long)(1L << RADIUS_SHIFT) * 255)
  28
  29 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  30 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  31
  32 #define MAXCONTROL      1000            // max length control message we ever send...
  33 #define MAXETHER        (1500+18)       // max packet we try sending to tun
  34 #define MAXTEL          96              // telephone number
  35 #define MAXUSER         128             // username
  36 #define MAXPASS         128             // password
  37 #define MAXPLUGINS      20              // maximum number of plugins to load
  38 #define MAXRADSERVER    10              // max radius servers
  39 #define MAXROUTE        10              // max static routes per session
  40 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  41 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  42 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  43 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  44 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  45 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  46
  47 // Constants
  48 #ifndef ETCDIR
  49 #define ETCDIR          "/etc/l2tpns"
  50 #endif
  51
  52 #ifndef LIBDIR
  53 #define LIBDIR          "/usr/lib/l2tpns"
  54 #endif
  55
  56 #ifndef STATEDIR
  57 #define STATEDIR        "/var/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 #ifndef DATADIR
  73 #define DATADIR         STATEDIR
  74 #endif
  75
  76 #define TUNDEVICE       "/dev/net/tun"
  77 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  78 #define STATEFILE       DATADIR "/state.dump"           // State dump file
  79 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  80 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  81 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  82 #define ACCT_TIME       3000            // 5 minute accounting interval
  83 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  84 #define L2TPPORT        1701            // L2TP port
  85 #define RADPORT         1645            // old radius port...
  86 #define PKTARP          0x0806          // ARP packet type
  87 #define PKTIP           0x0800          // IPv4 packet type
  88 #define PKTIPV6         0x86DD          // IPv6 packet type
  89 #define PPPPAP          0xC023
  90 #define PPPCHAP         0xC223
  91 #define PPPLCP          0xC021
  92 #define PPPIPCP         0x8021
  93 #define PPPIPV6CP       0x8057
  94 #define PPPCCP          0x80FD
  95 #define PPPIP           0x0021
  96 #define PPPIPV6         0x0057
  97 #define PPPMP           0x003D
  98 #define MIN_IP_SIZE     0x19
  99
 100 enum {
 101         ConfigReq = 1,
 102         ConfigAck,
 103         ConfigNak,
 104         ConfigRej,
 105         TerminateReq,
 106         TerminateAck,
 107         CodeRej,
 108         ProtocolRej,
 109         EchoReq,
 110         EchoReply,
 111         DiscardRequest,
 112         IdentRequest
 113 };
 114
 115 enum {
 116         AccessRequest = 1,
 117         AccessAccept,
 118         AccessReject,
 119         AccountingRequest,
 120         AccountingResponse,
 121         AccessChallenge = 11
 122 };
 123
 124 // Types
 125 typedef uint16_t sessionidt;
 126 typedef uint16_t tunnelidt;
 127 typedef uint32_t clockt;
 128 typedef uint8_t hasht[16];
 129
 130 // CLI actions
 131 struct cli_session_actions {
 132         char action;
 133         in_addr_t snoop_ip;
 134         uint16_t snoop_port;
 135         int throttle_in;
 136         int throttle_out;
 137         int filter_in;
 138         int filter_out;
 139 };
 140
 141 #define CLI_SESS_KILL           0x01
 142 #define CLI_SESS_SNOOP          0x02
 143 #define CLI_SESS_NOSNOOP        0x04
 144 #define CLI_SESS_THROTTLE       0x08
 145 #define CLI_SESS_NOTHROTTLE     0x10
 146 #define CLI_SESS_FILTER         0x20
 147 #define CLI_SESS_NOFILTER       0x40
 148
 149 struct cli_tunnel_actions {
 150         char action;
 151 };
 152
 153 #define CLI_TUN_KILL            0x01
 154
 155 // structures
 156 typedef struct                  // route
 157 {
 158         in_addr_t ip;
 159         in_addr_t mask;
 160 }
 161 routet;
 162
 163 typedef struct controls         // control message
 164 {
 165         struct controls *next;  // next in queue
 166         uint16_t length;        // length
 167         uint8_t buf[MAXCONTROL];
 168 }
 169 controlt;
 170
 171 typedef struct
 172 {
 173         sessionidt next;                // next session in linked list
 174         sessionidt far;                 // far end session ID
 175         tunnelidt tunnel;               // near end tunnel ID
 176         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 177         int ip_pool_index;              // index to IP pool
 178         unsigned long unique_id;        // unique session id
 179         uint16_t nr;                    // next receive
 180         uint16_t ns;                    // next send
 181         uint32_t magic;                 // ppp magic number
 182         uint32_t cin, cout;             // byte counts
 183         uint32_t pin, pout;             // packet counts
 184         uint32_t total_cin;             // This counter is never reset while a session is open
 185         uint32_t total_cout;            // This counter is never reset while a session is open
 186         uint32_t id;                    // session id
 187         uint16_t throttle_in;           // upstream throttle rate (kbps)
 188         uint16_t throttle_out;          // downstream throttle rate
 189         clockt opened;                  // when started
 190         clockt die;                     // being closed, when to finally free
 191         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 192         in_addr_t dns1, dns2;           // DNS servers
 193         routet route[MAXROUTE];         // static routes
 194         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 195         uint16_t mru;                   // maximum receive unit
 196         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 197         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 198         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 199         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 200         uint8_t walled_garden;          // is this session gardened?
 201         uint8_t flags1;                 // additional flags (currently unused);
 202         char random_vector[MAXTEL];
 203         int random_vector_length;
 204         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 205         char called[MAXTEL];            // called number
 206         char calling[MAXTEL];           // calling number
 207         uint32_t tx_connect_speed;
 208         uint32_t rx_connect_speed;
 209         uint32_t flags;                 // Various session flags.
 210         in_addr_t snoop_ip;             // Interception destination IP
 211         uint16_t snoop_port;            // Interception destination port
 212         uint16_t sid;                   // near end session id.
 213         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 214         uint8_t filter_out;             // output filter index
 215         struct in6_addr ipv6route;      // Static IPv6 route
 216         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 217         char reserved[1];               // Space to expand structure without changing HB_VERSION
 218 }
 219 sessiont;
 220
 221 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 222 #define SF_LCP_ACKED    2       // LCP negotiated
 223 #define SF_CCP_ACKED    4       // CCP negotiated
 224 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 225 #define SF_IPV6_NACKED  16      // IPv6 rejected
 226 #define SF_IPV6_ROUTED  32      // advertised v6 route
 227
 228 #define AUTHPAP         1       // allow PAP
 229 #define AUTHCHAP        2       // allow CHAP
 230
 231 typedef struct
 232 {
 233         // byte counters
 234         uint32_t cin;
 235         uint32_t cout;
 236
 237         // DoS prevention
 238         clockt last_packet_out;
 239         uint32_t packets_out;
 240         uint32_t packets_dropped;
 241 } sessionlocalt;
 242
 243 #define SESSIONPFC      1       // PFC negotiated flags
 244 #define SESSIONACFC     2       // ACFC negotiated flags
 245
 246 // 168 bytes per tunnel
 247 typedef struct
 248 {
 249         tunnelidt far;          // far end tunnel ID
 250         in_addr_t ip;           // Ip for far end
 251         uint16_t port;          // port for far end
 252         uint16_t window;        // Rx window
 253         uint16_t nr;            // next receive
 254         uint16_t ns;            // next send
 255         int state;              // current state (tunnelstate enum)
 256         clockt last;            // when last control message sent (used for resend timeout)
 257         clockt retry;           // when to try resenting pending control
 258         clockt die;             // being closed, when to finally free
 259         clockt lastrec;         // when the last control message was received
 260         char hostname[128];     // tunnel hostname
 261         char vendor[128];       // LAC vendor
 262         uint8_t try;            // number of retrys on a control message
 263         uint16_t controlc;      // outstaind messages in queue
 264         controlt *controls;     // oldest message
 265         controlt *controle;     // newest message
 266 }
 267 tunnelt;
 268
 269 // 180 bytes per radius session
 270 typedef struct                  // outstanding RADIUS requests
 271 {
 272         sessionidt session;     // which session this applies to
 273         hasht auth;             // request authenticator
 274         clockt retry;           // when to try next
 275         char calling[MAXTEL];   // calling number
 276         char pass[129];         // password
 277         uint8_t id;             // ID for PPP response
 278         uint8_t try;            // which try we are on
 279         uint8_t state;          // state of radius requests
 280         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 281 }
 282 radiust;
 283
 284 typedef struct
 285 {
 286         in_addr_t       address;        // Host byte order..
 287         char            assigned;       // 1 if assigned, 0 if free
 288         sessionidt      session;
 289         clockt          last;           // last used
 290         char            user[129];      // user (try to have ip addresses persistent)
 291 }
 292 ippoolt;
 293
 294 #ifdef RINGBUFFER
 295 struct Tringbuffer
 296 {
 297         struct {
 298                 char level;
 299                 sessionidt session;
 300                 tunnelidt tunnel;
 301                 char message[MAX_LOG_LENGTH];
 302         } buffer[RINGBUFFER_SIZE];
 303         int head;
 304         int tail;
 305 };
 306 #endif
 307
 308 /*
 309  * Possible tunnel states
 310  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 311  */
 312 enum
 313 {
 314         TUNNELFREE,             // Not in use
 315         TUNNELOPEN,             // Active tunnel
 316         TUNNELDIE,              // Currently closing
 317         TUNNELOPENING,          // Busy opening
 318         TUNNELUNDEF,            // Undefined
 319 };
 320
 321 enum
 322 {
 323         RADIUSNULL,             // Not in use
 324         RADIUSCHAP,             // sending CHAP down PPP
 325         RADIUSAUTH,             // sending auth to RADIUS server
 326         RADIUSIPCP,             // sending IPCP to end user
 327         RADIUSSTART,            // sending start accounting to RADIUS server
 328         RADIUSSTOP,             // sending stop accounting to RADIUS server
 329         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 330         RADIUSDEAD,             // errored while talking to radius server.
 331 };
 332
 333 struct Tstats
 334 {
 335     time_t      start_time;
 336     time_t      last_reset;
 337
 338     uint32_t    tun_rx_packets;
 339     uint32_t    tun_tx_packets;
 340     uint32_t    tun_rx_bytes;
 341     uint32_t    tun_tx_bytes;
 342     uint32_t    tun_rx_errors;
 343     uint32_t    tun_tx_errors;
 344     uint32_t    tun_rx_dropped;
 345
 346     uint32_t    tunnel_rx_packets;
 347     uint32_t    tunnel_tx_packets;
 348     uint32_t    tunnel_rx_bytes;
 349     uint32_t    tunnel_tx_bytes;
 350     uint32_t    tunnel_rx_errors;
 351     uint32_t    tunnel_tx_errors;
 352
 353     uint32_t    tunnel_retries;
 354     uint32_t    radius_retries;
 355
 356     uint32_t    arp_sent;
 357
 358     uint32_t    packets_snooped;
 359
 360     uint32_t    tunnel_created;
 361     uint32_t    session_created;
 362     uint32_t    tunnel_timeout;
 363     uint32_t    session_timeout;
 364     uint32_t    radius_timeout;
 365     uint32_t    radius_overflow;
 366     uint32_t    tunnel_overflow;
 367     uint32_t    session_overflow;
 368
 369     uint32_t    ip_allocated;
 370     uint32_t    ip_freed;
 371
 372     uint32_t    c_forwarded;
 373     uint32_t    recv_forward;
 374
 375     uint32_t    select_called;
 376     uint32_t    multi_read_used;
 377     uint32_t    multi_read_exceeded;
 378
 379 #ifdef STATISTICS
 380     uint32_t    call_processtun;
 381     uint32_t    call_processipout;
 382     uint32_t    call_processipv6out;
 383     uint32_t    call_processudp;
 384     uint32_t    call_sessionbyip;
 385     uint32_t    call_sessionbyipv6;
 386     uint32_t    call_sessionbyuser;
 387     uint32_t    call_sendarp;
 388     uint32_t    call_sendipcp;
 389     uint32_t    call_processipv6cp;
 390     uint32_t    call_tunnelsend;
 391     uint32_t    call_sessionkill;
 392     uint32_t    call_sessionshutdown;
 393     uint32_t    call_tunnelkill;
 394     uint32_t    call_tunnelshutdown;
 395     uint32_t    call_assign_ip_address;
 396     uint32_t    call_free_ip_address;
 397     uint32_t    call_dump_acct_info;
 398     uint32_t    call_sessionsetup;
 399     uint32_t    call_processpap;
 400     uint32_t    call_processchap;
 401     uint32_t    call_processlcp;
 402     uint32_t    call_processipcp;
 403     uint32_t    call_processipin;
 404     uint32_t    call_processipv6in;
 405     uint32_t    call_processccp;
 406     uint32_t    call_sendchap;
 407     uint32_t    call_processrad;
 408     uint32_t    call_radiussend;
 409     uint32_t    call_radiusretry;
 410     uint32_t    call_random_data;
 411 #endif
 412 };
 413
 414 #ifdef STATISTICS
 415
 416 #ifdef STAT_CALLS
 417 #define CSTAT(x)        STAT(call_ ## x)
 418 #else
 419 #define CSTAT(x)
 420 #endif
 421
 422 #define STAT(x)         (_statistics->x++)
 423 #define INC_STAT(x,y)   (_statistics->x += (y))
 424 #define GET_STAT(x)     (_statistics->x)
 425 #define SET_STAT(x, y)  (_statistics->x = (y))
 426 #else
 427 #define CSTAT(x)
 428 #define STAT(x)
 429 #define INC_STAT(x,y)
 430 #define GET_STAT(x)     0
 431 #define SET_STAT(x, y)
 432 #endif
 433
 434 typedef struct
 435 {
 436         int             debug;                          // debugging level
 437         time_t          start_time;                     // time when l2tpns was started
 438         char            bandwidth[256];                 // current bandwidth
 439         char            pid_file[256];                  // file to write PID to on startup
 440         int             wrote_pid;
 441         clockt          current_time;                   // 1/10ths of a second since the process started.
 442                                                         // means that we can only run a given process
 443                                                         // for 13 years without re-starting!
 444
 445         char            config_file[128];
 446         int             reload_config;                  // flag to re-read config (set by cli)
 447         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 448         int             multi_read_count;               // amount of packets to read per fd in processing loop
 449
 450         char            tundevice[10];                  // tun device name
 451         char            log_filename[128];
 452         char            l2tpsecret[64];
 453
 454         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 455
 456         char            radiussecret[64];
 457         int             radius_accounting;
 458         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 459         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 460         uint8_t         numradiusservers;               // radius server count
 461         short           num_radfds;                     // Number of radius filehandles allocated
 462
 463         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 464         int             radius_authtypes;
 465         int             radius_authprefer;
 466
 467         in_addr_t       default_dns1, default_dns2;
 468
 469         unsigned long   rl_rate;                        // default throttle rate
 470         int             num_tbfs;                       // number of throttle buckets
 471
 472         char            accounting_dir[128];
 473         in_addr_t       bind_address;
 474         in_addr_t       peer_address;
 475         int             send_garp;                      // Set to true to garp for vip address on startup
 476
 477         int             target_uid;
 478         int             dump_speed;
 479         char            plugins[64][MAXPLUGINS];
 480         char            old_plugins[64][MAXPLUGINS];
 481
 482         int             next_tbf;                       // Next HTB id available to use
 483         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling 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_num_changes;            // Number of changes queued.
 503
 504         int             cluster_hb_interval;            // How often to send a heartbeat.
 505         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 506         uint64_t        cluster_table_version;          // # state changes processed by cluster
 507
 508         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 509
 510 #ifdef BGP
 511 #define BGP_NUM_PEERS   2
 512         uint16_t as_number;
 513         struct {
 514                 char name[64];
 515                 uint16_t as;
 516                 int keepalive;
 517                 int hold;
 518         } neighbour[BGP_NUM_PEERS];
 519 #endif
 520 } configt;
 521
 522 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 523 typedef struct
 524 {
 525         char *key;
 526         int offset;
 527         int size;
 528         enum config_typet type;
 529 } config_descriptt;
 530
 531 typedef struct
 532 {
 533         uint8_t op;     // operation
 534 #define FILTER_PORT_OP_NONE     0 // all ports match
 535 #define FILTER_PORT_OP_EQ       1
 536 #define FILTER_PORT_OP_NEQ      2
 537 #define FILTER_PORT_OP_GT       3
 538 #define FILTER_PORT_OP_LT       4
 539 #define FILTER_PORT_OP_RANGE    5
 540         uint16_t port;  // port (host byte order)
 541         uint16_t port2; // range
 542 } ip_filter_portt;
 543
 544 typedef struct
 545 {
 546         int action;             // permit/deny
 547 #define FILTER_ACTION_DENY      1
 548 #define FILTER_ACTION_PERMIT    2
 549         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 550         in_addr_t src_ip;       // source ip (network byte order)
 551         in_addr_t src_wild;
 552         ip_filter_portt src_ports;
 553         in_addr_t dst_ip;       // dest ip
 554         in_addr_t dst_wild;
 555         ip_filter_portt dst_ports;
 556         uint8_t frag;           // apply to non-initial fragments
 557         uint8_t tcp_flag_op;    // match type: any, all, established
 558 #define FILTER_FLAG_OP_ANY      1
 559 #define FILTER_FLAG_OP_ALL      2
 560 #define FILTER_FLAG_OP_EST      3
 561         uint8_t tcp_sflags;     // flags set
 562         uint8_t tcp_cflags;     // flags clear
 563         uint32_t counter;       // match count
 564 } ip_filter_rulet;
 565
 566 #define TCP_FLAG_FIN    0x01
 567 #define TCP_FLAG_SYN    0x02
 568 #define TCP_FLAG_RST    0x04
 569 #define TCP_FLAG_PSH    0x08
 570 #define TCP_FLAG_ACK    0x10
 571 #define TCP_FLAG_URG    0x20
 572
 573 #define MAXFILTER               32
 574 #define MAXFILTER_RULES         32
 575 typedef struct
 576 {
 577         char name[32];          // ACL name
 578         int extended;           // type: 0 = standard, 1 = extended
 579         ip_filter_rulet rules[MAXFILTER_RULES];
 580         int used;               // session ref count
 581 } ip_filtert;
 582
 583 // arp.c
 584 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 585
 586
 587 // ppp.c
 588 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 589 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 590 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 591 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 592 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 593 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 594 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 595 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 596 void sendchap(tunnelidt t, sessionidt s);
 597 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 598 void initlcp(tunnelidt t, sessionidt s);
 599 void send_ipin(sessionidt s, uint8_t *buf, int len);
 600
 601
 602 // radius.c
 603 void initrad(void);
 604 void radiussend(uint16_t r, uint8_t state);
 605 void processrad(uint8_t *buf, int len, char socket_index);
 606 void radiusretry(uint16_t r);
 607 uint16_t radiusnew(sessionidt s);
 608 void radiusclear(uint16_t r, sessionidt s);
 609
 610
 611 // l2tpns.c
 612 clockt backoff(uint8_t try);
 613 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 614 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 615 sessionidt sessionbyip(in_addr_t ip);
 616 sessionidt sessionbyipv6(struct in6_addr ip);
 617 sessionidt sessionbyuser(char *username);
 618 void random_data(uint8_t *buf, int len);
 619 void sessionkill(sessionidt s, char *reason);
 620 void sessionshutdown(sessionidt s, char *reason);
 621 void send_garp(in_addr_t ip);
 622 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 623 void sendipcp(tunnelidt t, sessionidt s);
 624 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 625 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 626 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 627 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 628 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 629 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 630
 631 #undef LOG
 632 #undef LOG_HEX
 633 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 634 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 635
 636 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 637 void _log_hex(int level, const char *title, const char *data, int maxsize);
 638
 639 int sessionsetup(tunnelidt t, sessionidt s);
 640 int run_plugins(int plugin_type, void *data);
 641 void rebuild_address_pool(void);
 642 void throttle_session(sessionidt s, int rate_in, int rate_out);
 643 int load_session(sessionidt, sessiont *);
 644 void become_master(void);       // We're the master; kick off any required master initializations.
 645
 646
 647 // cli.c
 648 void init_cli(char *hostname);
 649 void cli_do_file(FILE *fh);
 650 void cli_do(int sockfd);
 651 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 652
 653
 654 // icmp.c
 655 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 656
 657
 658 extern tunnelt *tunnel;
 659 extern sessiont *session;
 660 extern sessionlocalt *sess_local;
 661 extern ippoolt *ip_address_pool;
 662 #define sessionfree (session[0].next)
 663
 664 #define log_backtrace(count, max) \
 665 if (count++ < max) { \
 666         void *array[20]; \
 667         char **strings; \
 668         int size, i; \
 669         LOG(0, 0, t, "Backtrace follows"); \
 670         size = backtrace(array, 10); \
 671         strings = backtrace_symbols(array, size); \
 672         if (strings) for (i = 0; i < size; i++) \
 673         { \
 674                 LOG(0, 0, t, "%s\n", strings[i]); \
 675         } \
 676         free(strings); \
 677 }
 678
 679
 680 extern configt *config;
 681 extern time_t basetime;         // Time when this process started.
 682 extern time_t time_now;         // Seconds since EPOCH.
 683 extern uint32_t last_id;
 684 extern struct Tstats *_statistics;
 685 extern in_addr_t my_address;
 686 extern int tun_write(uint8_t *data, int size);
 687 extern int clifd;
 688
 689
 690 #define TIME (config->current_time)
 691
 692 // macros for handling help in cli commands
 693 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 694 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 695
 696 // CVS identifiers (for "show version file")
 697 extern char const *cvs_id_arp;
 698 extern char const *cvs_id_cli;
 699 extern char const *cvs_id_cluster;
 700 extern char const *cvs_id_constants;
 701 extern char const *cvs_id_control;
 702 extern char const *cvs_id_icmp;
 703 extern char const *cvs_id_l2tpns;
 704 extern char const *cvs_id_ll;
 705 extern char const *cvs_id_md5;
 706 extern char const *cvs_id_ppp;
 707 extern char const *cvs_id_radius;
 708 extern char const *cvs_id_tbf;
 709 extern char const *cvs_id_util;
 710
 711 #endif /* __L2TPNS_H__ */