l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.55 2005/02/09 00:16:19 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      50000           // 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 MAXPLUGINS      20              // maximum number of plugins to load
  36 #define MAXRADSERVER    10              // max radius servers
  37 #define MAXROUTE        10              // max static routes per session
  38 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  39 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  40 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  41 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  42 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  43 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  44
  45 // Constants
  46 #ifndef ETCDIR
  47 #define ETCDIR          "/etc/l2tpns"
  48 #endif
  49
  50 #ifndef LIBDIR
  51 #define LIBDIR          "/usr/lib/l2tpns"
  52 #endif
  53
  54 #ifndef STATEDIR
  55 #define STATEDIR        "/var/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 #ifndef DATADIR
  71 #define DATADIR         STATEDIR
  72 #endif
  73
  74 #define TUNDEVICE       "/dev/net/tun"
  75 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  76 #define STATEFILE       DATADIR "/state.dump"           // State dump file
  77 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  78 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  79 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  80 #define ACCT_TIME       3000            // 5 minute accounting interval
  81 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  82 #define L2TPPORT        1701            // L2TP port
  83 #define RADPORT         1645            // old radius port...
  84 #define PKTARP          0x0806          // ARP packet type
  85 #define PKTIP           0x0800          // IPv4 packet type
  86 #define PKTIPV6         0x86DD          // IPv6 packet type
  87 #define PPPPAP          0xC023
  88 #define PPPCHAP         0xC223
  89 #define PPPLCP          0xC021
  90 #define PPPIPCP         0x8021
  91 #define PPPIPV6CP       0x8057
  92 #define PPPCCP          0x80FD
  93 #define PPPIP           0x0021
  94 #define PPPIPV6         0x0057
  95 #define PPPMP           0x003D
  96 #define MIN_IP_SIZE     0x19
  97
  98 enum {
  99         ConfigReq = 1,
 100         ConfigAck,
 101         ConfigNak,
 102         ConfigRej,
 103         TerminateReq,
 104         TerminateAck,
 105         CodeRej,
 106         ProtocolRej,
 107         EchoReq,
 108         EchoReply,
 109         DiscardRequest,
 110         IdentRequest
 111 };
 112
 113 enum {
 114         AccessRequest = 1,
 115         AccessAccept,
 116         AccessReject,
 117         AccountingRequest,
 118         AccountingResponse,
 119         AccessChallenge = 11
 120 };
 121
 122 // Types
 123 typedef uint16_t sessionidt;
 124 typedef uint16_t tunnelidt;
 125 typedef uint32_t clockt;
 126 typedef uint8_t hasht[16];
 127
 128 // CLI actions
 129 struct cli_session_actions {
 130         char action;
 131         in_addr_t snoop_ip;
 132         uint16_t snoop_port;
 133         int throttle_in;
 134         int throttle_out;
 135         int filter_in;
 136         int filter_out;
 137 };
 138
 139 #define CLI_SESS_KILL           0x01
 140 #define CLI_SESS_SNOOP          0x02
 141 #define CLI_SESS_NOSNOOP        0x04
 142 #define CLI_SESS_THROTTLE       0x08
 143 #define CLI_SESS_NOTHROTTLE     0x10
 144 #define CLI_SESS_FILTER         0x20
 145 #define CLI_SESS_NOFILTER       0x40
 146
 147 struct cli_tunnel_actions {
 148         char action;
 149 };
 150
 151 #define CLI_TUN_KILL            0x01
 152
 153 // dump header: update number if internal format changes
 154 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 155
 156 // structures
 157 typedef struct                  // route
 158 {
 159         in_addr_t ip;
 160         in_addr_t mask;
 161 }
 162 routet;
 163
 164 typedef struct controls         // control message
 165 {
 166         struct controls *next;  // next in queue
 167         uint16_t length;        // length
 168         uint8_t buf[MAXCONTROL];
 169 }
 170 controlt;
 171
 172 typedef struct
 173 {
 174         sessionidt next;                // next session in linked list
 175         sessionidt far;                 // far end session ID
 176         tunnelidt tunnel;               // near end tunnel ID
 177         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 178         int ip_pool_index;              // index to IP pool
 179         unsigned long unique_id;        // unique session id
 180         uint16_t nr;                    // next receive
 181         uint16_t ns;                    // next send
 182         uint32_t magic;                 // ppp magic number
 183         uint32_t cin, cout;             // byte counts
 184         uint32_t pin, pout;             // packet counts
 185         uint32_t total_cin;             // This counter is never reset while a session is open
 186         uint32_t total_cout;            // This counter is never reset while a session is open
 187         uint32_t id;                    // session id
 188         uint16_t throttle_in;           // upstream throttle rate (kbps)
 189         uint16_t throttle_out;          // downstream throttle rate
 190         clockt opened;                  // when started
 191         clockt die;                     // being closed, when to finally free
 192         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 193         in_addr_t dns1, dns2;           // DNS servers
 194         routet route[MAXROUTE];         // static routes
 195         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 196         uint16_t mru;                   // maximum receive unit
 197         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 198         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 199         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 200         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 201         uint8_t walled_garden;          // is this session gardened?
 202         uint8_t flags1;                 // additional flags (currently unused);
 203         char random_vector[MAXTEL];
 204         int random_vector_length;
 205         char user[129];                 // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
 206         char called[MAXTEL];            // called number
 207         char calling[MAXTEL];           // calling number
 208         uint32_t tx_connect_speed;
 209         uint32_t rx_connect_speed;
 210         uint32_t flags;                 // Various session flags.
 211         in_addr_t snoop_ip;             // Interception destination IP
 212         uint16_t snoop_port;            // Interception destination port
 213         uint16_t sid;                   // near end session id.
 214         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 215         uint8_t filter_out;             // output filter index
 216         struct in6_addr ipv6route;      // Static IPv6 route
 217         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 218         char reserved[1];               // Space to expand structure without changing HB_VERSION
 219 }
 220 sessiont;
 221
 222 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 223 #define SF_LCP_ACKED    2       // LCP negotiated
 224 #define SF_CCP_ACKED    4       // CCP negotiated
 225 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 226 #define SF_IPV6_NACKED  16      // IPv6 rejected
 227 #define SF_IPV6_ROUTED  32      // advertised v6 route
 228
 229 #define AUTHPAP         1       // allow PAP
 230 #define AUTHCHAP        2       // allow CHAP
 231
 232 typedef struct
 233 {
 234         // byte counters
 235         uint32_t cin;
 236         uint32_t cout;
 237
 238         // DoS prevention
 239         clockt last_packet_out;
 240         uint32_t packets_out;
 241         uint32_t packets_dropped;
 242 } sessionlocalt;
 243
 244 #define SESSIONPFC      1       // PFC negotiated flags
 245 #define SESSIONACFC     2       // ACFC negotiated flags
 246
 247 // 168 bytes per tunnel
 248 typedef struct
 249 {
 250         tunnelidt far;          // far end tunnel ID
 251         in_addr_t ip;           // Ip for far end
 252         uint16_t port;          // port for far end
 253         uint16_t window;        // Rx window
 254         uint16_t nr;            // next receive
 255         uint16_t ns;            // next send
 256         int state;              // current state (tunnelstate enum)
 257         clockt last;            // when last control message sent (used for resend timeout)
 258         clockt retry;           // when to try resenting pending control
 259         clockt die;             // being closed, when to finally free
 260         clockt lastrec;         // when the last control message was received
 261         char hostname[128];     // tunnel hostname
 262         char vendor[128];       // LAC vendor
 263         uint8_t try;            // number of retrys on a control message
 264         uint16_t controlc;      // outstaind messages in queue
 265         controlt *controls;     // oldest message
 266         controlt *controle;     // newest message
 267 }
 268 tunnelt;
 269
 270 // 180 bytes per radius session
 271 typedef struct                  // outstanding RADIUS requests
 272 {
 273         sessionidt session;     // which session this applies to
 274         hasht auth;             // request authenticator
 275         clockt retry;           // when to try next
 276         char calling[MAXTEL];   // calling number
 277         char pass[129];         // password
 278         uint8_t id;             // ID for PPP response
 279         uint8_t try;            // which try we are on
 280         uint8_t state;          // state of radius requests
 281         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 282 }
 283 radiust;
 284
 285 typedef struct
 286 {
 287         in_addr_t       address;        // Host byte order..
 288         char            assigned;       // 1 if assigned, 0 if free
 289         sessionidt      session;
 290         clockt          last;           // last used
 291         char            user[129];      // user (try to have ip addresses persistent)
 292 }
 293 ippoolt;
 294
 295 #ifdef RINGBUFFER
 296 struct Tringbuffer
 297 {
 298         struct {
 299                 char level;
 300                 sessionidt session;
 301                 tunnelidt tunnel;
 302                 char message[MAX_LOG_LENGTH];
 303         } buffer[RINGBUFFER_SIZE];
 304         int head;
 305         int tail;
 306 };
 307 #endif
 308
 309 /*
 310  * Possible tunnel states
 311  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 312  */
 313 enum
 314 {
 315         TUNNELFREE,             // Not in use
 316         TUNNELOPEN,             // Active tunnel
 317         TUNNELDIE,              // Currently closing
 318         TUNNELOPENING,          // Busy opening
 319         TUNNELUNDEF,            // Undefined
 320 };
 321
 322 enum
 323 {
 324         RADIUSNULL,             // Not in use
 325         RADIUSCHAP,             // sending CHAP down PPP
 326         RADIUSAUTH,             // sending auth to RADIUS server
 327         RADIUSIPCP,             // sending IPCP to end user
 328         RADIUSSTART,            // sending start accounting to RADIUS server
 329         RADIUSSTOP,             // sending stop accounting to RADIUS server
 330         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 331         RADIUSDEAD,             // errored while talking to radius server.
 332 };
 333
 334 struct Tstats
 335 {
 336     time_t      start_time;
 337     time_t      last_reset;
 338
 339     uint32_t    tun_rx_packets;
 340     uint32_t    tun_tx_packets;
 341     uint32_t    tun_rx_bytes;
 342     uint32_t    tun_tx_bytes;
 343     uint32_t    tun_rx_errors;
 344     uint32_t    tun_tx_errors;
 345     uint32_t    tun_rx_dropped;
 346
 347     uint32_t    tunnel_rx_packets;
 348     uint32_t    tunnel_tx_packets;
 349     uint32_t    tunnel_rx_bytes;
 350     uint32_t    tunnel_tx_bytes;
 351     uint32_t    tunnel_rx_errors;
 352     uint32_t    tunnel_tx_errors;
 353
 354     uint32_t    tunnel_retries;
 355     uint32_t    radius_retries;
 356
 357     uint32_t    arp_sent;
 358
 359     uint32_t    packets_snooped;
 360
 361     uint32_t    tunnel_created;
 362     uint32_t    session_created;
 363     uint32_t    tunnel_timeout;
 364     uint32_t    session_timeout;
 365     uint32_t    radius_timeout;
 366     uint32_t    radius_overflow;
 367     uint32_t    tunnel_overflow;
 368     uint32_t    session_overflow;
 369
 370     uint32_t    ip_allocated;
 371     uint32_t    ip_freed;
 372
 373     uint32_t    c_forwarded;
 374     uint32_t    recv_forward;
 375
 376     uint32_t    select_called;
 377     uint32_t    multi_read_used;
 378     uint32_t    multi_read_exceeded;
 379
 380 #ifdef STATISTICS
 381     uint32_t    call_processtun;
 382     uint32_t    call_processipout;
 383     uint32_t    call_processipv6out;
 384     uint32_t    call_processudp;
 385     uint32_t    call_sessionbyip;
 386     uint32_t    call_sessionbyipv6;
 387     uint32_t    call_sessionbyuser;
 388     uint32_t    call_sendarp;
 389     uint32_t    call_sendipcp;
 390     uint32_t    call_processipv6cp;
 391     uint32_t    call_tunnelsend;
 392     uint32_t    call_sessionkill;
 393     uint32_t    call_sessionshutdown;
 394     uint32_t    call_tunnelkill;
 395     uint32_t    call_tunnelshutdown;
 396     uint32_t    call_assign_ip_address;
 397     uint32_t    call_free_ip_address;
 398     uint32_t    call_dump_acct_info;
 399     uint32_t    call_sessionsetup;
 400     uint32_t    call_processpap;
 401     uint32_t    call_processchap;
 402     uint32_t    call_processlcp;
 403     uint32_t    call_processipcp;
 404     uint32_t    call_processipin;
 405     uint32_t    call_processipv6in;
 406     uint32_t    call_processccp;
 407     uint32_t    call_sendchap;
 408     uint32_t    call_processrad;
 409     uint32_t    call_radiussend;
 410     uint32_t    call_radiusretry;
 411     uint32_t    call_random_data;
 412 #endif
 413 };
 414
 415 #ifdef STATISTICS
 416
 417 #ifdef STAT_CALLS
 418 #define CSTAT(x)        STAT(call_ ## x)
 419 #else
 420 #define CSTAT(x)
 421 #endif
 422
 423 #define STAT(x)         (_statistics->x++)
 424 #define INC_STAT(x,y)   (_statistics->x += (y))
 425 #define GET_STAT(x)     (_statistics->x)
 426 #define SET_STAT(x, y)  (_statistics->x = (y))
 427 #else
 428 #define CSTAT(x)
 429 #define STAT(x)
 430 #define INC_STAT(x,y)
 431 #define GET_STAT(x)     0
 432 #define SET_STAT(x, y)
 433 #endif
 434
 435 typedef struct
 436 {
 437         int             debug;                          // debugging level
 438         time_t          start_time;                     // time when l2tpns was started
 439         char            bandwidth[256];                 // current bandwidth
 440         char            pid_file[256];                  // file to write PID to on startup
 441         int             wrote_pid;
 442         clockt          current_time;                   // 1/10ths of a second since the process started.
 443                                                         // means that we can only run a given process
 444                                                         // for 13 years without re-starting!
 445
 446         char            config_file[128];
 447         int             reload_config;                  // flag to re-read config (set by cli)
 448         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 449         int             multi_read_count;               // amount of packets to read per fd in processing loop
 450
 451         char            tundevice[10];                  // tun device name
 452         char            log_filename[128];
 453         char            l2tpsecret[64];
 454
 455         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 456
 457         char            radiussecret[64];
 458         int             radius_accounting;
 459         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 460         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 461         uint8_t         numradiusservers;               // radius server count
 462         short           num_radfds;                     // Number of radius filehandles allocated
 463
 464         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 465         int             radius_authtypes;
 466         int             radius_authprefer;
 467
 468         in_addr_t       default_dns1, default_dns2;
 469
 470         unsigned long   rl_rate;                        // default throttle rate
 471         int             num_tbfs;                       // number of throttle buckets
 472
 473         char            accounting_dir[128];
 474         in_addr_t       bind_address;
 475         in_addr_t       peer_address;
 476         int             send_garp;                      // Set to true to garp for vip address on startup
 477
 478         int             target_uid;
 479         int             dump_speed;
 480         char            plugins[64][MAXPLUGINS];
 481         char            old_plugins[64][MAXPLUGINS];
 482
 483         int             next_tbf;                       // Next HTB id available to use
 484         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 485         int             lock_pages;                     // Lock pages into memory.
 486         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 487         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 488
 489         in_addr_t       cluster_address;                // Multicast address of cluster.
 490                                                         // Send to this address to have everyone hear.
 491         char            cluster_interface[64];          // Which interface to listen for multicast on.
 492         int             cluster_iam_master;             // Are we the cluster master???
 493         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 494         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 495                                                         // Zero if i am the cluster master.
 496         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 497                                                         // (or the seq number we're next expecting if we're a slave).
 498         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 499         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 500         int             cluster_highest_sessionid;
 501         int             cluster_highest_tunnelid;
 502         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the 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 #ifdef BGP
 512 #define BGP_NUM_PEERS   2
 513         uint16_t as_number;
 514         struct {
 515                 char name[64];
 516                 uint16_t as;
 517                 int keepalive;
 518                 int hold;
 519         } neighbour[BGP_NUM_PEERS];
 520 #endif
 521 } configt;
 522
 523 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 524 typedef struct
 525 {
 526         char *key;
 527         int offset;
 528         int size;
 529         enum config_typet type;
 530 } config_descriptt;
 531
 532 typedef struct
 533 {
 534         uint8_t op;     // operation
 535 #define FILTER_PORT_OP_NONE     0 // all ports match
 536 #define FILTER_PORT_OP_EQ       1
 537 #define FILTER_PORT_OP_NEQ      2
 538 #define FILTER_PORT_OP_GT       3
 539 #define FILTER_PORT_OP_LT       4
 540 #define FILTER_PORT_OP_RANGE    5
 541         uint16_t port;  // port (host byte order)
 542         uint16_t port2; // range
 543 } ip_filter_portt;
 544
 545 typedef struct
 546 {
 547         int action;             // permit/deny
 548 #define FILTER_ACTION_DENY      1
 549 #define FILTER_ACTION_PERMIT    2
 550         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 551         in_addr_t src_ip;       // source ip (network byte order)
 552         in_addr_t src_wild;
 553         ip_filter_portt src_ports;
 554         in_addr_t dst_ip;       // dest ip
 555         in_addr_t dst_wild;
 556         ip_filter_portt dst_ports;
 557         uint8_t frag;           // apply to non-initial fragments
 558         uint8_t tcp_flag_op;    // match type: any, all, established
 559 #define FILTER_FLAG_OP_ANY      1
 560 #define FILTER_FLAG_OP_ALL      2
 561 #define FILTER_FLAG_OP_EST      3
 562         uint8_t tcp_sflags;     // flags set
 563         uint8_t tcp_cflags;     // flags clear
 564         uint32_t counter;       // match count
 565 } ip_filter_rulet;
 566
 567 #define TCP_FLAG_FIN    0x01
 568 #define TCP_FLAG_SYN    0x02
 569 #define TCP_FLAG_RST    0x04
 570 #define TCP_FLAG_PSH    0x08
 571 #define TCP_FLAG_ACK    0x10
 572 #define TCP_FLAG_URG    0x20
 573
 574 #define MAXFILTER               32
 575 #define MAXFILTER_RULES         32
 576 typedef struct
 577 {
 578         char name[32];          // ACL name
 579         int extended;           // type: 0 = standard, 1 = extended
 580         ip_filter_rulet rules[MAXFILTER_RULES];
 581         int used;               // session ref count
 582 } ip_filtert;
 583
 584 // arp.c
 585 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 586
 587
 588 // ppp.c
 589 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 590 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 591 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 592 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 593 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 594 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 595 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 596 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 597 void sendchap(tunnelidt t, sessionidt s);
 598 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 599 void initlcp(tunnelidt t, sessionidt s);
 600 void send_ipin(sessionidt s, uint8_t *buf, int len);
 601
 602
 603 // radius.c
 604 void initrad(void);
 605 void radiussend(uint16_t r, uint8_t state);
 606 void processrad(uint8_t *buf, int len, char socket_index);
 607 void radiusretry(uint16_t r);
 608 uint16_t radiusnew(sessionidt s);
 609 void radiusclear(uint16_t r, sessionidt s);
 610
 611
 612 // l2tpns.c
 613 clockt backoff(uint8_t try);
 614 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 615 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 616 sessionidt sessionbyip(in_addr_t ip);
 617 sessionidt sessionbyipv6(struct in6_addr ip);
 618 sessionidt sessionbyuser(char *username);
 619 void random_data(uint8_t *buf, int len);
 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__ */