l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.74 2005-06-02 04:04:07 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    6
  26 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  27 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  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 #define DEFAULT_MRU     1452            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
  47
  48 // Constants
  49 #ifndef ETCDIR
  50 #define ETCDIR          "/etc/l2tpns"
  51 #endif
  52
  53 #ifndef LIBDIR
  54 #define LIBDIR          "/usr/lib/l2tpns"
  55 #endif
  56
  57 #ifndef PLUGINDIR
  58 #define PLUGINDIR       LIBDIR          // Plugins
  59 #endif
  60
  61 #ifndef PLUGINCONF
  62 #define PLUGINCONF      ETCDIR          // Plugin config dir
  63 #endif
  64
  65 #ifndef FLASHDIR
  66 #define FLASHDIR        ETCDIR
  67 #endif
  68
  69 #define TUNDEVICE       "/dev/net/tun"
  70 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  71 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  72 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  73 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  74 #define ACCT_TIME       3000            // 5 minute accounting interval
  75 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  76 #define L2TPPORT        1701            // L2TP port
  77 #define RADPORT         1645            // old radius port...
  78 #define PKTARP          0x0806          // ARP packet type
  79 #define PKTIP           0x0800          // IPv4 packet type
  80 #define PKTIPV6         0x86DD          // IPv6 packet type
  81 #define PPPPAP          0xC023
  82 #define PPPCHAP         0xC223
  83 #define PPPLCP          0xC021
  84 #define PPPIPCP         0x8021
  85 #define PPPIPV6CP       0x8057
  86 #define PPPCCP          0x80FD
  87 #define PPPIP           0x0021
  88 #define PPPIPV6         0x0057
  89 #define PPPMP           0x003D
  90 #define MIN_IP_SIZE     0x19
  91
  92 enum {
  93         ConfigReq = 1,
  94         ConfigAck,
  95         ConfigNak,
  96         ConfigRej,
  97         TerminateReq,
  98         TerminateAck,
  99         CodeRej,
 100         ProtocolRej,
 101         EchoReq,
 102         EchoReply,
 103         DiscardRequest,
 104         IdentRequest
 105 };
 106
 107 enum {
 108         AccessRequest = 1,
 109         AccessAccept,
 110         AccessReject,
 111         AccountingRequest,
 112         AccountingResponse,
 113         AccessChallenge = 11
 114 };
 115
 116 // Types
 117 typedef uint16_t sessionidt;
 118 typedef uint16_t tunnelidt;
 119 typedef uint32_t clockt;
 120 typedef uint8_t hasht[16];
 121
 122 // CLI actions
 123 struct cli_session_actions {
 124         char action;
 125         in_addr_t snoop_ip;
 126         uint16_t snoop_port;
 127         int throttle_in;
 128         int throttle_out;
 129         int filter_in;
 130         int filter_out;
 131 };
 132
 133 #define CLI_SESS_KILL           0x01
 134 #define CLI_SESS_SNOOP          0x02
 135 #define CLI_SESS_NOSNOOP        0x04
 136 #define CLI_SESS_THROTTLE       0x08
 137 #define CLI_SESS_NOTHROTTLE     0x10
 138 #define CLI_SESS_FILTER         0x20
 139 #define CLI_SESS_NOFILTER       0x40
 140
 141 struct cli_tunnel_actions {
 142         char action;
 143 };
 144
 145 #define CLI_TUN_KILL            0x01
 146
 147 // structures
 148 typedef struct                  // route
 149 {
 150         in_addr_t ip;
 151         in_addr_t mask;
 152 }
 153 routet;
 154
 155 typedef struct controls         // control message
 156 {
 157         struct controls *next;  // next in queue
 158         uint16_t length;        // length
 159         uint8_t buf[MAXCONTROL];
 160 }
 161 controlt;
 162
 163 typedef struct
 164 {
 165         sessionidt next;                // next session in linked list
 166         sessionidt far;                 // far end session ID
 167         tunnelidt tunnel;               // near end tunnel ID
 168         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 169         uint8_t flags;                  // Various session flags.
 170         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 171         int ip_pool_index;              // index to IP pool
 172         uint32_t unique_id;             // unique session id
 173         uint16_t nr;                    // next receive
 174         uint16_t ns;                    // next send
 175         uint32_t magic;                 // ppp magic number
 176         uint32_t cin, cout;             // byte counts
 177         uint32_t pin, pout;             // packet counts
 178         uint32_t total_cin;             // This counter is never reset while a session is open
 179         uint32_t total_cout;            // This counter is never reset while a session is open
 180         uint16_t throttle_in;           // upstream throttle rate (kbps)
 181         uint16_t throttle_out;          // downstream throttle rate
 182         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 183         uint8_t filter_out;             // output filter index
 184         uint16_t mru;                   // maximum receive unit
 185         clockt opened;                  // when started
 186         clockt die;                     // being closed, when to finally free
 187         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 188         in_addr_t dns1, dns2;           // DNS servers
 189         routet route[MAXROUTE];         // static routes
 190         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 191         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 192         int random_vector_length;
 193         char random_vector[MAXTEL];
 194         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 195         char called[MAXTEL];            // called number
 196         char calling[MAXTEL];           // calling number
 197         uint32_t tx_connect_speed;
 198         uint32_t rx_connect_speed;
 199         in_addr_t snoop_ip;             // Interception destination IP
 200         uint16_t snoop_port;            // Interception destination port
 201         uint8_t walled_garden;          // is this session gardened?
 202         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 203         struct in6_addr ipv6route;      // Static IPv6 route
 204         char reserved[24];              // Space to expand structure without changing HB_VERSION
 205 }
 206 sessiont;
 207
 208 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 209 #define SF_LCP_ACKED    2       // LCP negotiated
 210 #define SF_CCP_ACKED    4       // CCP negotiated
 211 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 212 #define SF_IPV6_NACKED  16      // IPv6 rejected
 213 #define SF_IPV6_ROUTED  32      // advertised v6 route
 214
 215 #define AUTHPAP         1       // allow PAP
 216 #define AUTHCHAP        2       // allow CHAP
 217
 218 typedef struct
 219 {
 220         // byte counters
 221         uint32_t cin;
 222         uint32_t cout;
 223
 224         // DoS prevention
 225         clockt last_packet_out;
 226         uint32_t packets_out;
 227         uint32_t packets_dropped;
 228
 229         // RADIUS session in use
 230         uint16_t radius;
 231
 232         // interim RADIUS
 233         time_t last_interim;
 234 } sessionlocalt;
 235
 236 #define SESSIONPFC      1       // PFC negotiated flags
 237 #define SESSIONACFC     2       // ACFC negotiated flags
 238
 239 // 168 bytes per tunnel
 240 typedef struct
 241 {
 242         tunnelidt far;          // far end tunnel ID
 243         in_addr_t ip;           // Ip for far end
 244         uint16_t port;          // port for far end
 245         uint16_t window;        // Rx window
 246         uint16_t nr;            // next receive
 247         uint16_t ns;            // next send
 248         int state;              // current state (tunnelstate enum)
 249         clockt last;            // when last control message sent (used for resend timeout)
 250         clockt retry;           // when to try resenting pending control
 251         clockt die;             // being closed, when to finally free
 252         clockt lastrec;         // when the last control message was received
 253         char hostname[128];     // tunnel hostname
 254         char vendor[128];       // LAC vendor
 255         uint8_t try;            // number of retrys on a control message
 256         uint16_t controlc;      // outstaind messages in queue
 257         controlt *controls;     // oldest message
 258         controlt *controle;     // newest message
 259 }
 260 tunnelt;
 261
 262 // 180 bytes per radius session
 263 typedef struct                  // outstanding RADIUS requests
 264 {
 265         sessionidt session;     // which session this applies to
 266         hasht auth;             // request authenticator
 267         clockt retry;           // when to try next
 268         char calling[MAXTEL];   // calling number
 269         char pass[129];         // password
 270         uint8_t id;             // ID for PPP response
 271         uint8_t try;            // which try we are on
 272         uint8_t state;          // state of radius requests
 273         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 274 }
 275 radiust;
 276
 277 typedef struct
 278 {
 279         in_addr_t       address;        // Host byte order..
 280         char            assigned;       // 1 if assigned, 0 if free
 281         sessionidt      session;
 282         clockt          last;           // last used
 283         char            user[129];      // user (try to have ip addresses persistent)
 284 }
 285 ippoolt;
 286
 287 #ifdef RINGBUFFER
 288 struct Tringbuffer
 289 {
 290         struct {
 291                 char level;
 292                 sessionidt session;
 293                 tunnelidt tunnel;
 294                 char message[MAX_LOG_LENGTH];
 295         } buffer[RINGBUFFER_SIZE];
 296         int head;
 297         int tail;
 298 };
 299 #endif
 300
 301 /*
 302  * Possible tunnel states
 303  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 304  */
 305 enum
 306 {
 307         TUNNELFREE,             // Not in use
 308         TUNNELOPEN,             // Active tunnel
 309         TUNNELDIE,              // Currently closing
 310         TUNNELOPENING,          // Busy opening
 311         TUNNELUNDEF,            // Undefined
 312 };
 313
 314 enum
 315 {
 316         RADIUSNULL,             // Not in use
 317         RADIUSCHAP,             // sending CHAP down PPP
 318         RADIUSAUTH,             // sending auth to RADIUS server
 319         RADIUSIPCP,             // sending IPCP to end user
 320         RADIUSSTART,            // sending start accounting to RADIUS server
 321         RADIUSSTOP,             // sending stop accounting to RADIUS server
 322         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 323         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 324 };
 325
 326 struct Tstats
 327 {
 328     time_t      start_time;
 329     time_t      last_reset;
 330
 331     uint32_t    tun_rx_packets;
 332     uint32_t    tun_tx_packets;
 333     uint32_t    tun_rx_bytes;
 334     uint32_t    tun_tx_bytes;
 335     uint32_t    tun_rx_errors;
 336     uint32_t    tun_tx_errors;
 337     uint32_t    tun_rx_dropped;
 338
 339     uint32_t    tunnel_rx_packets;
 340     uint32_t    tunnel_tx_packets;
 341     uint32_t    tunnel_rx_bytes;
 342     uint32_t    tunnel_tx_bytes;
 343     uint32_t    tunnel_rx_errors;
 344     uint32_t    tunnel_tx_errors;
 345
 346     uint32_t    tunnel_retries;
 347     uint32_t    radius_retries;
 348
 349     uint32_t    arp_sent;
 350
 351     uint32_t    packets_snooped;
 352
 353     uint32_t    tunnel_created;
 354     uint32_t    session_created;
 355     uint32_t    tunnel_timeout;
 356     uint32_t    session_timeout;
 357     uint32_t    radius_timeout;
 358     uint32_t    radius_overflow;
 359     uint32_t    tunnel_overflow;
 360     uint32_t    session_overflow;
 361
 362     uint32_t    ip_allocated;
 363     uint32_t    ip_freed;
 364
 365     uint32_t    c_forwarded;
 366     uint32_t    recv_forward;
 367
 368     uint32_t    select_called;
 369     uint32_t    multi_read_used;
 370     uint32_t    multi_read_exceeded;
 371
 372 #ifdef STATISTICS
 373     uint32_t    call_processtun;
 374     uint32_t    call_processipout;
 375     uint32_t    call_processipv6out;
 376     uint32_t    call_processudp;
 377     uint32_t    call_sessionbyip;
 378     uint32_t    call_sessionbyipv6;
 379     uint32_t    call_sessionbyuser;
 380     uint32_t    call_sendarp;
 381     uint32_t    call_sendipcp;
 382     uint32_t    call_processipv6cp;
 383     uint32_t    call_tunnelsend;
 384     uint32_t    call_sessionkill;
 385     uint32_t    call_sessionshutdown;
 386     uint32_t    call_tunnelkill;
 387     uint32_t    call_tunnelshutdown;
 388     uint32_t    call_assign_ip_address;
 389     uint32_t    call_free_ip_address;
 390     uint32_t    call_dump_acct_info;
 391     uint32_t    call_sessionsetup;
 392     uint32_t    call_processpap;
 393     uint32_t    call_processchap;
 394     uint32_t    call_processlcp;
 395     uint32_t    call_processipcp;
 396     uint32_t    call_processipin;
 397     uint32_t    call_processipv6in;
 398     uint32_t    call_processccp;
 399     uint32_t    call_sendchap;
 400     uint32_t    call_processrad;
 401     uint32_t    call_radiussend;
 402     uint32_t    call_radiusretry;
 403     uint32_t    call_random_data;
 404 #endif
 405 };
 406
 407 #ifdef STATISTICS
 408
 409 #ifdef STAT_CALLS
 410 #define CSTAT(x)        STAT(call_ ## x)
 411 #else
 412 #define CSTAT(x)
 413 #endif
 414
 415 #define STAT(x)         (_statistics->x++)
 416 #define INC_STAT(x,y)   (_statistics->x += (y))
 417 #define GET_STAT(x)     (_statistics->x)
 418 #define SET_STAT(x, y)  (_statistics->x = (y))
 419 #else
 420 #define CSTAT(x)
 421 #define STAT(x)
 422 #define INC_STAT(x,y)
 423 #define GET_STAT(x)     0
 424 #define SET_STAT(x, y)
 425 #endif
 426
 427 typedef struct
 428 {
 429         int             debug;                          // debugging level
 430         time_t          start_time;                     // time when l2tpns was started
 431         char            bandwidth[256];                 // current bandwidth
 432         char            pid_file[256];                  // file to write PID to on startup
 433         int             wrote_pid;
 434         clockt          current_time;                   // 1/10ths of a second since the process started.
 435                                                         // means that we can only run a given process
 436                                                         // for 13 years without re-starting!
 437
 438         char            config_file[128];
 439         int             reload_config;                  // flag to re-read config (set by cli)
 440         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 441         int             multi_read_count;               // amount of packets to read per fd in processing loop
 442
 443         char            tundevice[10];                  // tun device name
 444         char            log_filename[128];
 445         char            l2tpsecret[64];
 446
 447         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 448
 449         char            radiussecret[64];
 450         int             radius_accounting;
 451         int             radius_interim;
 452         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 453         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 454         uint8_t         numradiusservers;               // radius server count
 455         short           num_radfds;                     // Number of radius filehandles allocated
 456
 457         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 458         int             radius_authtypes;
 459         int             radius_authprefer;
 460
 461         int             allow_duplicate_users;          // allow multiple logins with the same username
 462
 463         in_addr_t       default_dns1, default_dns2;
 464
 465         unsigned long   rl_rate;                        // default throttle rate
 466         int             num_tbfs;                       // number of throttle buckets
 467
 468         char            accounting_dir[128];
 469         in_addr_t       bind_address;
 470         in_addr_t       peer_address;
 471         int             send_garp;                      // Set to true to garp for vip address on startup
 472
 473         int             target_uid;
 474         int             dump_speed;
 475         char            plugins[64][MAXPLUGINS];
 476         char            old_plugins[64][MAXPLUGINS];
 477
 478         int             next_tbf;                       // Next HTB id available to use
 479         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 480                                                         // policy for this process.
 481         int             lock_pages;                     // Lock pages into memory.
 482         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 483         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 484
 485         in_addr_t       cluster_address;                // Multicast address of cluster.
 486                                                         // Send to this address to have everyone hear.
 487         char            cluster_interface[64];          // Which interface to listen for multicast on.
 488         int             cluster_iam_master;             // Are we the cluster master???
 489         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 490         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 491                                                         // Zero if i am the cluster master.
 492         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 493                                                         // (or the seq number we're next expecting if we're a slave).
 494         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 495         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 496         int             cluster_highest_sessionid;
 497         int             cluster_highest_tunnelid;
 498         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 499         int             cluster_num_changes;            // Number of changes queued.
 500
 501         int             cluster_hb_interval;            // How often to send a heartbeat.
 502         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 503         uint64_t        cluster_table_version;          // # state changes processed by cluster
 504
 505         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 506
 507
 508         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 509                                                         // slaves is less than this value.
 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 sendlcp(tunnelidt t, sessionidt s, int authtype);
 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 sessionkill(sessionidt s, char *reason);
 621 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 622 void send_garp(in_addr_t ip);
 623 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 624 void sendipcp(tunnelidt t, sessionidt s);
 625 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 626 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 627 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 628 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 629 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 630 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 631
 632 #undef LOG
 633 #undef LOG_HEX
 634 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 635 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 636
 637 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 638 void _log_hex(int level, const char *title, const char *data, int maxsize);
 639
 640 int sessionsetup(tunnelidt t, sessionidt s);
 641 int run_plugins(int plugin_type, void *data);
 642 void rebuild_address_pool(void);
 643 void throttle_session(sessionidt s, int rate_in, int rate_out);
 644 int load_session(sessionidt, sessiont *);
 645 void become_master(void);       // We're the master; kick off any required master initializations.
 646
 647
 648 // cli.c
 649 void init_cli(char *hostname);
 650 void cli_do_file(FILE *fh);
 651 void cli_do(int sockfd);
 652 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 653
 654
 655 // icmp.c
 656 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 657
 658
 659 extern tunnelt *tunnel;
 660 extern sessiont *session;
 661 extern sessionlocalt *sess_local;
 662 extern ippoolt *ip_address_pool;
 663 #define sessionfree (session[0].next)
 664
 665 #define log_backtrace(count, max) \
 666 if (count++ < max) { \
 667         void *array[20]; \
 668         char **strings; \
 669         int size, i; \
 670         LOG(0, 0, t, "Backtrace follows"); \
 671         size = backtrace(array, 10); \
 672         strings = backtrace_symbols(array, size); \
 673         if (strings) for (i = 0; i < size; i++) \
 674         { \
 675                 LOG(0, 0, t, "%s\n", strings[i]); \
 676         } \
 677         free(strings); \
 678 }
 679
 680
 681 extern configt *config;
 682 extern time_t basetime;         // Time when this process started.
 683 extern time_t time_now;         // Seconds since EPOCH.
 684 extern uint32_t last_id;
 685 extern struct Tstats *_statistics;
 686 extern in_addr_t my_address;
 687 extern int tun_write(uint8_t *data, int size);
 688 extern int clifd;
 689
 690
 691 #define TIME (config->current_time)
 692
 693 // macros for handling help in cli commands
 694 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 695 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 696
 697 // CVS identifiers (for "show version file")
 698 extern char const *cvs_id_arp;
 699 extern char const *cvs_id_cli;
 700 extern char const *cvs_id_cluster;
 701 extern char const *cvs_id_constants;
 702 extern char const *cvs_id_control;
 703 extern char const *cvs_id_icmp;
 704 extern char const *cvs_id_l2tpns;
 705 extern char const *cvs_id_ll;
 706 extern char const *cvs_id_md5;
 707 extern char const *cvs_id_ppp;
 708 extern char const *cvs_id_radius;
 709 extern char const *cvs_id_tbf;
 710 extern char const *cvs_id_util;
 711
 712 #endif /* __L2TPNS_H__ */