l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.58 2005-03-10 03:31:25 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 // dump header: update number if internal format changes
 156 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
 157
 158 // structures
 159 typedef struct                  // route
 160 {
 161         in_addr_t ip;
 162         in_addr_t mask;
 163 }
 164 routet;
 165
 166 typedef struct controls         // control message
 167 {
 168         struct controls *next;  // next in queue
 169         uint16_t length;        // length
 170         uint8_t buf[MAXCONTROL];
 171 }
 172 controlt;
 173
 174 typedef struct
 175 {
 176         sessionidt next;                // next session in linked list
 177         sessionidt far;                 // far end session ID
 178         tunnelidt tunnel;               // near end tunnel ID
 179         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 180         int ip_pool_index;              // index to IP pool
 181         unsigned long unique_id;        // unique session id
 182         uint16_t nr;                    // next receive
 183         uint16_t ns;                    // next send
 184         uint32_t magic;                 // ppp magic number
 185         uint32_t cin, cout;             // byte counts
 186         uint32_t pin, pout;             // packet counts
 187         uint32_t total_cin;             // This counter is never reset while a session is open
 188         uint32_t total_cout;            // This counter is never reset while a session is open
 189         uint32_t id;                    // session id
 190         uint16_t throttle_in;           // upstream throttle rate (kbps)
 191         uint16_t throttle_out;          // downstream throttle rate
 192         clockt opened;                  // when started
 193         clockt die;                     // being closed, when to finally free
 194         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 195         in_addr_t dns1, dns2;           // DNS servers
 196         routet route[MAXROUTE];         // static routes
 197         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 198         uint16_t mru;                   // maximum receive unit
 199         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 200         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 201         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 202         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 203         uint8_t walled_garden;          // is this session gardened?
 204         uint8_t flags1;                 // additional flags (currently unused);
 205         char random_vector[MAXTEL];
 206         int random_vector_length;
 207         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 208         char called[MAXTEL];            // called number
 209         char calling[MAXTEL];           // calling number
 210         uint32_t tx_connect_speed;
 211         uint32_t rx_connect_speed;
 212         uint32_t flags;                 // Various session flags.
 213         in_addr_t snoop_ip;             // Interception destination IP
 214         uint16_t snoop_port;            // Interception destination port
 215         uint16_t sid;                   // near end session id.
 216         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 217         uint8_t filter_out;             // output filter index
 218         struct in6_addr ipv6route;      // Static IPv6 route
 219         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 220         char reserved[1];               // Space to expand structure without changing HB_VERSION
 221 }
 222 sessiont;
 223
 224 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 225 #define SF_LCP_ACKED    2       // LCP negotiated
 226 #define SF_CCP_ACKED    4       // CCP negotiated
 227 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 228 #define SF_IPV6_NACKED  16      // IPv6 rejected
 229 #define SF_IPV6_ROUTED  32      // advertised v6 route
 230
 231 #define AUTHPAP         1       // allow PAP
 232 #define AUTHCHAP        2       // allow CHAP
 233
 234 typedef struct
 235 {
 236         // byte counters
 237         uint32_t cin;
 238         uint32_t cout;
 239
 240         // DoS prevention
 241         clockt last_packet_out;
 242         uint32_t packets_out;
 243         uint32_t packets_dropped;
 244 } sessionlocalt;
 245
 246 #define SESSIONPFC      1       // PFC negotiated flags
 247 #define SESSIONACFC     2       // ACFC negotiated flags
 248
 249 // 168 bytes per tunnel
 250 typedef struct
 251 {
 252         tunnelidt far;          // far end tunnel ID
 253         in_addr_t ip;           // Ip for far end
 254         uint16_t port;          // port for far end
 255         uint16_t window;        // Rx window
 256         uint16_t nr;            // next receive
 257         uint16_t ns;            // next send
 258         int state;              // current state (tunnelstate enum)
 259         clockt last;            // when last control message sent (used for resend timeout)
 260         clockt retry;           // when to try resenting pending control
 261         clockt die;             // being closed, when to finally free
 262         clockt lastrec;         // when the last control message was received
 263         char hostname[128];     // tunnel hostname
 264         char vendor[128];       // LAC vendor
 265         uint8_t try;            // number of retrys on a control message
 266         uint16_t controlc;      // outstaind messages in queue
 267         controlt *controls;     // oldest message
 268         controlt *controle;     // newest message
 269 }
 270 tunnelt;
 271
 272 // 180 bytes per radius session
 273 typedef struct                  // outstanding RADIUS requests
 274 {
 275         sessionidt session;     // which session this applies to
 276         hasht auth;             // request authenticator
 277         clockt retry;           // when to try next
 278         char calling[MAXTEL];   // calling number
 279         char pass[129];         // password
 280         uint8_t id;             // ID for PPP response
 281         uint8_t try;            // which try we are on
 282         uint8_t state;          // state of radius requests
 283         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 284 }
 285 radiust;
 286
 287 typedef struct
 288 {
 289         in_addr_t       address;        // Host byte order..
 290         char            assigned;       // 1 if assigned, 0 if free
 291         sessionidt      session;
 292         clockt          last;           // last used
 293         char            user[129];      // user (try to have ip addresses persistent)
 294 }
 295 ippoolt;
 296
 297 #ifdef RINGBUFFER
 298 struct Tringbuffer
 299 {
 300         struct {
 301                 char level;
 302                 sessionidt session;
 303                 tunnelidt tunnel;
 304                 char message[MAX_LOG_LENGTH];
 305         } buffer[RINGBUFFER_SIZE];
 306         int head;
 307         int tail;
 308 };
 309 #endif
 310
 311 /*
 312  * Possible tunnel states
 313  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 314  */
 315 enum
 316 {
 317         TUNNELFREE,             // Not in use
 318         TUNNELOPEN,             // Active tunnel
 319         TUNNELDIE,              // Currently closing
 320         TUNNELOPENING,          // Busy opening
 321         TUNNELUNDEF,            // Undefined
 322 };
 323
 324 enum
 325 {
 326         RADIUSNULL,             // Not in use
 327         RADIUSCHAP,             // sending CHAP down PPP
 328         RADIUSAUTH,             // sending auth to RADIUS server
 329         RADIUSIPCP,             // sending IPCP to end user
 330         RADIUSSTART,            // sending start accounting to RADIUS server
 331         RADIUSSTOP,             // sending stop accounting to RADIUS server
 332         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 333         RADIUSDEAD,             // errored while talking to radius server.
 334 };
 335
 336 struct Tstats
 337 {
 338     time_t      start_time;
 339     time_t      last_reset;
 340
 341     uint32_t    tun_rx_packets;
 342     uint32_t    tun_tx_packets;
 343     uint32_t    tun_rx_bytes;
 344     uint32_t    tun_tx_bytes;
 345     uint32_t    tun_rx_errors;
 346     uint32_t    tun_tx_errors;
 347     uint32_t    tun_rx_dropped;
 348
 349     uint32_t    tunnel_rx_packets;
 350     uint32_t    tunnel_tx_packets;
 351     uint32_t    tunnel_rx_bytes;
 352     uint32_t    tunnel_tx_bytes;
 353     uint32_t    tunnel_rx_errors;
 354     uint32_t    tunnel_tx_errors;
 355
 356     uint32_t    tunnel_retries;
 357     uint32_t    radius_retries;
 358
 359     uint32_t    arp_sent;
 360
 361     uint32_t    packets_snooped;
 362
 363     uint32_t    tunnel_created;
 364     uint32_t    session_created;
 365     uint32_t    tunnel_timeout;
 366     uint32_t    session_timeout;
 367     uint32_t    radius_timeout;
 368     uint32_t    radius_overflow;
 369     uint32_t    tunnel_overflow;
 370     uint32_t    session_overflow;
 371
 372     uint32_t    ip_allocated;
 373     uint32_t    ip_freed;
 374
 375     uint32_t    c_forwarded;
 376     uint32_t    recv_forward;
 377
 378     uint32_t    select_called;
 379     uint32_t    multi_read_used;
 380     uint32_t    multi_read_exceeded;
 381
 382 #ifdef STATISTICS
 383     uint32_t    call_processtun;
 384     uint32_t    call_processipout;
 385     uint32_t    call_processipv6out;
 386     uint32_t    call_processudp;
 387     uint32_t    call_sessionbyip;
 388     uint32_t    call_sessionbyipv6;
 389     uint32_t    call_sessionbyuser;
 390     uint32_t    call_sendarp;
 391     uint32_t    call_sendipcp;
 392     uint32_t    call_processipv6cp;
 393     uint32_t    call_tunnelsend;
 394     uint32_t    call_sessionkill;
 395     uint32_t    call_sessionshutdown;
 396     uint32_t    call_tunnelkill;
 397     uint32_t    call_tunnelshutdown;
 398     uint32_t    call_assign_ip_address;
 399     uint32_t    call_free_ip_address;
 400     uint32_t    call_dump_acct_info;
 401     uint32_t    call_sessionsetup;
 402     uint32_t    call_processpap;
 403     uint32_t    call_processchap;
 404     uint32_t    call_processlcp;
 405     uint32_t    call_processipcp;
 406     uint32_t    call_processipin;
 407     uint32_t    call_processipv6in;
 408     uint32_t    call_processccp;
 409     uint32_t    call_sendchap;
 410     uint32_t    call_processrad;
 411     uint32_t    call_radiussend;
 412     uint32_t    call_radiusretry;
 413     uint32_t    call_random_data;
 414 #endif
 415 };
 416
 417 #ifdef STATISTICS
 418
 419 #ifdef STAT_CALLS
 420 #define CSTAT(x)        STAT(call_ ## x)
 421 #else
 422 #define CSTAT(x)
 423 #endif
 424
 425 #define STAT(x)         (_statistics->x++)
 426 #define INC_STAT(x,y)   (_statistics->x += (y))
 427 #define GET_STAT(x)     (_statistics->x)
 428 #define SET_STAT(x, y)  (_statistics->x = (y))
 429 #else
 430 #define CSTAT(x)
 431 #define STAT(x)
 432 #define INC_STAT(x,y)
 433 #define GET_STAT(x)     0
 434 #define SET_STAT(x, y)
 435 #endif
 436
 437 typedef struct
 438 {
 439         int             debug;                          // debugging level
 440         time_t          start_time;                     // time when l2tpns was started
 441         char            bandwidth[256];                 // current bandwidth
 442         char            pid_file[256];                  // file to write PID to on startup
 443         int             wrote_pid;
 444         clockt          current_time;                   // 1/10ths of a second since the process started.
 445                                                         // means that we can only run a given process
 446                                                         // for 13 years without re-starting!
 447
 448         char            config_file[128];
 449         int             reload_config;                  // flag to re-read config (set by cli)
 450         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 451         int             multi_read_count;               // amount of packets to read per fd in processing loop
 452
 453         char            tundevice[10];                  // tun device name
 454         char            log_filename[128];
 455         char            l2tpsecret[64];
 456
 457         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 458
 459         char            radiussecret[64];
 460         int             radius_accounting;
 461         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 462         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 463         uint8_t         numradiusservers;               // radius server count
 464         short           num_radfds;                     // Number of radius filehandles allocated
 465
 466         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 467         int             radius_authtypes;
 468         int             radius_authprefer;
 469
 470         in_addr_t       default_dns1, default_dns2;
 471
 472         unsigned long   rl_rate;                        // default throttle rate
 473         int             num_tbfs;                       // number of throttle buckets
 474
 475         char            accounting_dir[128];
 476         in_addr_t       bind_address;
 477         in_addr_t       peer_address;
 478         int             send_garp;                      // Set to true to garp for vip address on startup
 479
 480         int             target_uid;
 481         int             dump_speed;
 482         char            plugins[64][MAXPLUGINS];
 483         char            old_plugins[64][MAXPLUGINS];
 484
 485         int             next_tbf;                       // Next HTB id available to use
 486         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 487         int             lock_pages;                     // Lock pages into memory.
 488         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 489         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 490
 491         in_addr_t       cluster_address;                // Multicast address of cluster.
 492                                                         // Send to this address to have everyone hear.
 493         char            cluster_interface[64];          // Which interface to listen for multicast on.
 494         int             cluster_iam_master;             // Are we the cluster master???
 495         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 496         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 497                                                         // Zero if i am the cluster master.
 498         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 499                                                         // (or the seq number we're next expecting if we're a slave).
 500         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 501         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 502         int             cluster_highest_sessionid;
 503         int             cluster_highest_tunnelid;
 504         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 505         int             cluster_num_changes;            // Number of changes queued.
 506
 507         int             cluster_hb_interval;            // How often to send a heartbeat.
 508         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 509         uint64_t        cluster_table_version;          // # state changes processed by cluster
 510
 511         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 512
 513 #ifdef BGP
 514 #define BGP_NUM_PEERS   2
 515         uint16_t as_number;
 516         struct {
 517                 char name[64];
 518                 uint16_t as;
 519                 int keepalive;
 520                 int hold;
 521         } neighbour[BGP_NUM_PEERS];
 522 #endif
 523 } configt;
 524
 525 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 526 typedef struct
 527 {
 528         char *key;
 529         int offset;
 530         int size;
 531         enum config_typet type;
 532 } config_descriptt;
 533
 534 typedef struct
 535 {
 536         uint8_t op;     // operation
 537 #define FILTER_PORT_OP_NONE     0 // all ports match
 538 #define FILTER_PORT_OP_EQ       1
 539 #define FILTER_PORT_OP_NEQ      2
 540 #define FILTER_PORT_OP_GT       3
 541 #define FILTER_PORT_OP_LT       4
 542 #define FILTER_PORT_OP_RANGE    5
 543         uint16_t port;  // port (host byte order)
 544         uint16_t port2; // range
 545 } ip_filter_portt;
 546
 547 typedef struct
 548 {
 549         int action;             // permit/deny
 550 #define FILTER_ACTION_DENY      1
 551 #define FILTER_ACTION_PERMIT    2
 552         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 553         in_addr_t src_ip;       // source ip (network byte order)
 554         in_addr_t src_wild;
 555         ip_filter_portt src_ports;
 556         in_addr_t dst_ip;       // dest ip
 557         in_addr_t dst_wild;
 558         ip_filter_portt dst_ports;
 559         uint8_t frag;           // apply to non-initial fragments
 560         uint8_t tcp_flag_op;    // match type: any, all, established
 561 #define FILTER_FLAG_OP_ANY      1
 562 #define FILTER_FLAG_OP_ALL      2
 563 #define FILTER_FLAG_OP_EST      3
 564         uint8_t tcp_sflags;     // flags set
 565         uint8_t tcp_cflags;     // flags clear
 566         uint32_t counter;       // match count
 567 } ip_filter_rulet;
 568
 569 #define TCP_FLAG_FIN    0x01
 570 #define TCP_FLAG_SYN    0x02
 571 #define TCP_FLAG_RST    0x04
 572 #define TCP_FLAG_PSH    0x08
 573 #define TCP_FLAG_ACK    0x10
 574 #define TCP_FLAG_URG    0x20
 575
 576 #define MAXFILTER               32
 577 #define MAXFILTER_RULES         32
 578 typedef struct
 579 {
 580         char name[32];          // ACL name
 581         int extended;           // type: 0 = standard, 1 = extended
 582         ip_filter_rulet rules[MAXFILTER_RULES];
 583         int used;               // session ref count
 584 } ip_filtert;
 585
 586 // arp.c
 587 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 588
 589
 590 // ppp.c
 591 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 592 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 593 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 594 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 595 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 596 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 597 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 598 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 599 void sendchap(tunnelidt t, sessionidt s);
 600 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 601 void initlcp(tunnelidt t, sessionidt s);
 602 void send_ipin(sessionidt s, uint8_t *buf, int len);
 603
 604
 605 // radius.c
 606 void initrad(void);
 607 void radiussend(uint16_t r, uint8_t state);
 608 void processrad(uint8_t *buf, int len, char socket_index);
 609 void radiusretry(uint16_t r);
 610 uint16_t radiusnew(sessionidt s);
 611 void radiusclear(uint16_t r, sessionidt s);
 612
 613
 614 // l2tpns.c
 615 clockt backoff(uint8_t try);
 616 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 617 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 618 sessionidt sessionbyip(in_addr_t ip);
 619 sessionidt sessionbyipv6(struct in6_addr ip);
 620 sessionidt sessionbyuser(char *username);
 621 void random_data(uint8_t *buf, int len);
 622 void sessionkill(sessionidt s, char *reason);
 623 void sessionshutdown(sessionidt s, char *reason);
 624 void send_garp(in_addr_t ip);
 625 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 626 void sendipcp(tunnelidt t, sessionidt s);
 627 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 628 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 629 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 630 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 631 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 632 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 633
 634 #undef LOG
 635 #undef LOG_HEX
 636 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 637 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 638
 639 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 640 void _log_hex(int level, const char *title, const char *data, int maxsize);
 641
 642 int sessionsetup(tunnelidt t, sessionidt s);
 643 int run_plugins(int plugin_type, void *data);
 644 void rebuild_address_pool(void);
 645 void throttle_session(sessionidt s, int rate_in, int rate_out);
 646 int load_session(sessionidt, sessiont *);
 647 void become_master(void);       // We're the master; kick off any required master initializations.
 648
 649
 650 // cli.c
 651 void init_cli(char *hostname);
 652 void cli_do_file(FILE *fh);
 653 void cli_do(int sockfd);
 654 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 655
 656
 657 // icmp.c
 658 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 659
 660
 661 extern tunnelt *tunnel;
 662 extern sessiont *session;
 663 extern sessionlocalt *sess_local;
 664 extern ippoolt *ip_address_pool;
 665 #define sessionfree (session[0].next)
 666
 667 #define log_backtrace(count, max) \
 668 if (count++ < max) { \
 669         void *array[20]; \
 670         char **strings; \
 671         int size, i; \
 672         LOG(0, 0, t, "Backtrace follows"); \
 673         size = backtrace(array, 10); \
 674         strings = backtrace_symbols(array, size); \
 675         if (strings) for (i = 0; i < size; i++) \
 676         { \
 677                 LOG(0, 0, t, "%s\n", strings[i]); \
 678         } \
 679         free(strings); \
 680 }
 681
 682
 683 extern configt *config;
 684 extern time_t basetime;         // Time when this process started.
 685 extern time_t time_now;         // Seconds since EPOCH.
 686 extern uint32_t last_id;
 687 extern struct Tstats *_statistics;
 688 extern in_addr_t my_address;
 689 extern int tun_write(uint8_t *data, int size);
 690 extern int clifd;
 691
 692
 693 #define TIME (config->current_time)
 694
 695 // macros for handling help in cli commands
 696 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 697 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 698
 699 // CVS identifiers (for "show version file")
 700 extern char const *cvs_id_arp;
 701 extern char const *cvs_id_cli;
 702 extern char const *cvs_id_cluster;
 703 extern char const *cvs_id_constants;
 704 extern char const *cvs_id_control;
 705 extern char const *cvs_id_icmp;
 706 extern char const *cvs_id_l2tpns;
 707 extern char const *cvs_id_ll;
 708 extern char const *cvs_id_md5;
 709 extern char const *cvs_id_ppp;
 710 extern char const *cvs_id_radius;
 711 extern char const *cvs_id_tbf;
 712 extern char const *cvs_id_util;
 713
 714 #endif /* __L2TPNS_H__ */