l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.62 2005/04/18 04:18:15 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 PLUGINDIR
  57 #define PLUGINDIR       LIBDIR          // Plugins
  58 #endif
  59
  60 #ifndef PLUGINCONF
  61 #define PLUGINCONF      ETCDIR          // Plugin config dir
  62 #endif
  63
  64 #ifndef FLASHDIR
  65 #define FLASHDIR        ETCDIR
  66 #endif
  67
  68 #define TUNDEVICE       "/dev/net/tun"
  69 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  70 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  71 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  72 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  73 #define ACCT_TIME       3000            // 5 minute accounting interval
  74 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  75 #define L2TPPORT        1701            // L2TP port
  76 #define RADPORT         1645            // old radius port...
  77 #define PKTARP          0x0806          // ARP packet type
  78 #define PKTIP           0x0800          // IPv4 packet type
  79 #define PKTIPV6         0x86DD          // IPv6 packet type
  80 #define PPPPAP          0xC023
  81 #define PPPCHAP         0xC223
  82 #define PPPLCP          0xC021
  83 #define PPPIPCP         0x8021
  84 #define PPPIPV6CP       0x8057
  85 #define PPPCCP          0x80FD
  86 #define PPPIP           0x0021
  87 #define PPPIPV6         0x0057
  88 #define PPPMP           0x003D
  89 #define MIN_IP_SIZE     0x19
  90
  91 enum {
  92         ConfigReq = 1,
  93         ConfigAck,
  94         ConfigNak,
  95         ConfigRej,
  96         TerminateReq,
  97         TerminateAck,
  98         CodeRej,
  99         ProtocolRej,
 100         EchoReq,
 101         EchoReply,
 102         DiscardRequest,
 103         IdentRequest
 104 };
 105
 106 enum {
 107         AccessRequest = 1,
 108         AccessAccept,
 109         AccessReject,
 110         AccountingRequest,
 111         AccountingResponse,
 112         AccessChallenge = 11
 113 };
 114
 115 // Types
 116 typedef uint16_t sessionidt;
 117 typedef uint16_t tunnelidt;
 118 typedef uint32_t clockt;
 119 typedef uint8_t hasht[16];
 120
 121 // CLI actions
 122 struct cli_session_actions {
 123         char action;
 124         in_addr_t snoop_ip;
 125         uint16_t snoop_port;
 126         int throttle_in;
 127         int throttle_out;
 128         int filter_in;
 129         int filter_out;
 130 };
 131
 132 #define CLI_SESS_KILL           0x01
 133 #define CLI_SESS_SNOOP          0x02
 134 #define CLI_SESS_NOSNOOP        0x04
 135 #define CLI_SESS_THROTTLE       0x08
 136 #define CLI_SESS_NOTHROTTLE     0x10
 137 #define CLI_SESS_FILTER         0x20
 138 #define CLI_SESS_NOFILTER       0x40
 139
 140 struct cli_tunnel_actions {
 141         char action;
 142 };
 143
 144 #define CLI_TUN_KILL            0x01
 145
 146 // structures
 147 typedef struct                  // route
 148 {
 149         in_addr_t ip;
 150         in_addr_t mask;
 151 }
 152 routet;
 153
 154 typedef struct controls         // control message
 155 {
 156         struct controls *next;  // next in queue
 157         uint16_t length;        // length
 158         uint8_t buf[MAXCONTROL];
 159 }
 160 controlt;
 161
 162 typedef struct
 163 {
 164         sessionidt next;                // next session in linked list
 165         sessionidt far;                 // far end session ID
 166         tunnelidt tunnel;               // near end tunnel ID
 167         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 168         int ip_pool_index;              // index to IP pool
 169         unsigned long unique_id;        // unique session id
 170         uint16_t nr;                    // next receive
 171         uint16_t ns;                    // next send
 172         uint32_t magic;                 // ppp magic number
 173         uint32_t cin, cout;             // byte counts
 174         uint32_t pin, pout;             // packet counts
 175         uint32_t total_cin;             // This counter is never reset while a session is open
 176         uint32_t total_cout;            // This counter is never reset while a session is open
 177         uint32_t id;                    // session id
 178         uint16_t throttle_in;           // upstream throttle rate (kbps)
 179         uint16_t throttle_out;          // downstream throttle rate
 180         clockt opened;                  // when started
 181         clockt die;                     // being closed, when to finally free
 182         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 183         in_addr_t dns1, dns2;           // DNS servers
 184         routet route[MAXROUTE];         // static routes
 185         uint16_t radius;                // which radius session is being used (0 for not waiting on authentication)
 186         uint16_t mru;                   // maximum receive unit
 187         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 188         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 189         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 190         uint8_t reserved_old_snoop;     // No longer used - remove at some time
 191         uint8_t walled_garden;          // is this session gardened?
 192         uint8_t flags1;                 // additional flags (currently unused);
 193         char random_vector[MAXTEL];
 194         int random_vector_length;
 195         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 196         char called[MAXTEL];            // called number
 197         char calling[MAXTEL];           // calling number
 198         uint32_t tx_connect_speed;
 199         uint32_t rx_connect_speed;
 200         uint32_t flags;                 // Various session flags.
 201         in_addr_t snoop_ip;             // Interception destination IP
 202         uint16_t snoop_port;            // Interception destination port
 203         uint16_t sid;                   // near end session id.
 204         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 205         uint8_t filter_out;             // output filter index
 206         struct in6_addr ipv6route;      // Static IPv6 route
 207         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 208         char reserved[1];               // Space to expand structure without changing HB_VERSION
 209 }
 210 sessiont;
 211
 212 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 213 #define SF_LCP_ACKED    2       // LCP negotiated
 214 #define SF_CCP_ACKED    4       // CCP negotiated
 215 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 216 #define SF_IPV6_NACKED  16      // IPv6 rejected
 217 #define SF_IPV6_ROUTED  32      // advertised v6 route
 218
 219 #define AUTHPAP         1       // allow PAP
 220 #define AUTHCHAP        2       // allow CHAP
 221
 222 typedef struct
 223 {
 224         // byte counters
 225         uint32_t cin;
 226         uint32_t cout;
 227
 228         // DoS prevention
 229         clockt last_packet_out;
 230         uint32_t packets_out;
 231         uint32_t packets_dropped;
 232 } sessionlocalt;
 233
 234 #define SESSIONPFC      1       // PFC negotiated flags
 235 #define SESSIONACFC     2       // ACFC negotiated flags
 236
 237 // 168 bytes per tunnel
 238 typedef struct
 239 {
 240         tunnelidt far;          // far end tunnel ID
 241         in_addr_t ip;           // Ip for far end
 242         uint16_t port;          // port for far end
 243         uint16_t window;        // Rx window
 244         uint16_t nr;            // next receive
 245         uint16_t ns;            // next send
 246         int state;              // current state (tunnelstate enum)
 247         clockt last;            // when last control message sent (used for resend timeout)
 248         clockt retry;           // when to try resenting pending control
 249         clockt die;             // being closed, when to finally free
 250         clockt lastrec;         // when the last control message was received
 251         char hostname[128];     // tunnel hostname
 252         char vendor[128];       // LAC vendor
 253         uint8_t try;            // number of retrys on a control message
 254         uint16_t controlc;      // outstaind messages in queue
 255         controlt *controls;     // oldest message
 256         controlt *controle;     // newest message
 257 }
 258 tunnelt;
 259
 260 // 180 bytes per radius session
 261 typedef struct                  // outstanding RADIUS requests
 262 {
 263         sessionidt session;     // which session this applies to
 264         hasht auth;             // request authenticator
 265         clockt retry;           // when to try next
 266         char calling[MAXTEL];   // calling number
 267         char pass[129];         // password
 268         uint8_t id;             // ID for PPP response
 269         uint8_t try;            // which try we are on
 270         uint8_t state;          // state of radius requests
 271         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 272 }
 273 radiust;
 274
 275 typedef struct
 276 {
 277         in_addr_t       address;        // Host byte order..
 278         char            assigned;       // 1 if assigned, 0 if free
 279         sessionidt      session;
 280         clockt          last;           // last used
 281         char            user[129];      // user (try to have ip addresses persistent)
 282 }
 283 ippoolt;
 284
 285 #ifdef RINGBUFFER
 286 struct Tringbuffer
 287 {
 288         struct {
 289                 char level;
 290                 sessionidt session;
 291                 tunnelidt tunnel;
 292                 char message[MAX_LOG_LENGTH];
 293         } buffer[RINGBUFFER_SIZE];
 294         int head;
 295         int tail;
 296 };
 297 #endif
 298
 299 /*
 300  * Possible tunnel states
 301  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 302  */
 303 enum
 304 {
 305         TUNNELFREE,             // Not in use
 306         TUNNELOPEN,             // Active tunnel
 307         TUNNELDIE,              // Currently closing
 308         TUNNELOPENING,          // Busy opening
 309         TUNNELUNDEF,            // Undefined
 310 };
 311
 312 enum
 313 {
 314         RADIUSNULL,             // Not in use
 315         RADIUSCHAP,             // sending CHAP down PPP
 316         RADIUSAUTH,             // sending auth to RADIUS server
 317         RADIUSIPCP,             // sending IPCP to end user
 318         RADIUSSTART,            // sending start accounting to RADIUS server
 319         RADIUSSTOP,             // sending stop accounting to RADIUS server
 320         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 321         RADIUSDEAD,             // errored while talking to radius server.
 322 };
 323
 324 struct Tstats
 325 {
 326     time_t      start_time;
 327     time_t      last_reset;
 328
 329     uint32_t    tun_rx_packets;
 330     uint32_t    tun_tx_packets;
 331     uint32_t    tun_rx_bytes;
 332     uint32_t    tun_tx_bytes;
 333     uint32_t    tun_rx_errors;
 334     uint32_t    tun_tx_errors;
 335     uint32_t    tun_rx_dropped;
 336
 337     uint32_t    tunnel_rx_packets;
 338     uint32_t    tunnel_tx_packets;
 339     uint32_t    tunnel_rx_bytes;
 340     uint32_t    tunnel_tx_bytes;
 341     uint32_t    tunnel_rx_errors;
 342     uint32_t    tunnel_tx_errors;
 343
 344     uint32_t    tunnel_retries;
 345     uint32_t    radius_retries;
 346
 347     uint32_t    arp_sent;
 348
 349     uint32_t    packets_snooped;
 350
 351     uint32_t    tunnel_created;
 352     uint32_t    session_created;
 353     uint32_t    tunnel_timeout;
 354     uint32_t    session_timeout;
 355     uint32_t    radius_timeout;
 356     uint32_t    radius_overflow;
 357     uint32_t    tunnel_overflow;
 358     uint32_t    session_overflow;
 359
 360     uint32_t    ip_allocated;
 361     uint32_t    ip_freed;
 362
 363     uint32_t    c_forwarded;
 364     uint32_t    recv_forward;
 365
 366     uint32_t    select_called;
 367     uint32_t    multi_read_used;
 368     uint32_t    multi_read_exceeded;
 369
 370 #ifdef STATISTICS
 371     uint32_t    call_processtun;
 372     uint32_t    call_processipout;
 373     uint32_t    call_processipv6out;
 374     uint32_t    call_processudp;
 375     uint32_t    call_sessionbyip;
 376     uint32_t    call_sessionbyipv6;
 377     uint32_t    call_sessionbyuser;
 378     uint32_t    call_sendarp;
 379     uint32_t    call_sendipcp;
 380     uint32_t    call_processipv6cp;
 381     uint32_t    call_tunnelsend;
 382     uint32_t    call_sessionkill;
 383     uint32_t    call_sessionshutdown;
 384     uint32_t    call_tunnelkill;
 385     uint32_t    call_tunnelshutdown;
 386     uint32_t    call_assign_ip_address;
 387     uint32_t    call_free_ip_address;
 388     uint32_t    call_dump_acct_info;
 389     uint32_t    call_sessionsetup;
 390     uint32_t    call_processpap;
 391     uint32_t    call_processchap;
 392     uint32_t    call_processlcp;
 393     uint32_t    call_processipcp;
 394     uint32_t    call_processipin;
 395     uint32_t    call_processipv6in;
 396     uint32_t    call_processccp;
 397     uint32_t    call_sendchap;
 398     uint32_t    call_processrad;
 399     uint32_t    call_radiussend;
 400     uint32_t    call_radiusretry;
 401     uint32_t    call_random_data;
 402 #endif
 403 };
 404
 405 #ifdef STATISTICS
 406
 407 #ifdef STAT_CALLS
 408 #define CSTAT(x)        STAT(call_ ## x)
 409 #else
 410 #define CSTAT(x)
 411 #endif
 412
 413 #define STAT(x)         (_statistics->x++)
 414 #define INC_STAT(x,y)   (_statistics->x += (y))
 415 #define GET_STAT(x)     (_statistics->x)
 416 #define SET_STAT(x, y)  (_statistics->x = (y))
 417 #else
 418 #define CSTAT(x)
 419 #define STAT(x)
 420 #define INC_STAT(x,y)
 421 #define GET_STAT(x)     0
 422 #define SET_STAT(x, y)
 423 #endif
 424
 425 typedef struct
 426 {
 427         int             debug;                          // debugging level
 428         time_t          start_time;                     // time when l2tpns was started
 429         char            bandwidth[256];                 // current bandwidth
 430         char            pid_file[256];                  // file to write PID to on startup
 431         int             wrote_pid;
 432         clockt          current_time;                   // 1/10ths of a second since the process started.
 433                                                         // means that we can only run a given process
 434                                                         // for 13 years without re-starting!
 435
 436         char            config_file[128];
 437         int             reload_config;                  // flag to re-read config (set by cli)
 438         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 439         int             multi_read_count;               // amount of packets to read per fd in processing loop
 440
 441         char            tundevice[10];                  // tun device name
 442         char            log_filename[128];
 443         char            l2tpsecret[64];
 444
 445         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 446
 447         char            radiussecret[64];
 448         int             radius_accounting;
 449         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 450         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 451         uint8_t         numradiusservers;               // radius server count
 452         short           num_radfds;                     // Number of radius filehandles allocated
 453
 454         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 455         int             radius_authtypes;
 456         int             radius_authprefer;
 457
 458         in_addr_t       default_dns1, default_dns2;
 459
 460         unsigned long   rl_rate;                        // default throttle rate
 461         int             num_tbfs;                       // number of throttle buckets
 462
 463         char            accounting_dir[128];
 464         in_addr_t       bind_address;
 465         in_addr_t       peer_address;
 466         int             send_garp;                      // Set to true to garp for vip address on startup
 467
 468         int             target_uid;
 469         int             dump_speed;
 470         char            plugins[64][MAXPLUGINS];
 471         char            old_plugins[64][MAXPLUGINS];
 472
 473         int             next_tbf;                       // Next HTB id available to use
 474         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 475         int             lock_pages;                     // Lock pages into memory.
 476         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 477         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 478
 479         in_addr_t       cluster_address;                // Multicast address of cluster.
 480                                                         // Send to this address to have everyone hear.
 481         char            cluster_interface[64];          // Which interface to listen for multicast on.
 482         int             cluster_iam_master;             // Are we the cluster master???
 483         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 484         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 485                                                         // Zero if i am the cluster master.
 486         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 487                                                         // (or the seq number we're next expecting if we're a slave).
 488         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 489         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 490         int             cluster_highest_sessionid;
 491         int             cluster_highest_tunnelid;
 492         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 493         int             cluster_num_changes;            // Number of changes queued.
 494
 495         int             cluster_hb_interval;            // How often to send a heartbeat.
 496         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 497         uint64_t        cluster_table_version;          // # state changes processed by cluster
 498
 499         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 500
 501 #ifdef BGP
 502 #define BGP_NUM_PEERS   2
 503         uint16_t as_number;
 504         struct {
 505                 char name[64];
 506                 uint16_t as;
 507                 int keepalive;
 508                 int hold;
 509         } neighbour[BGP_NUM_PEERS];
 510 #endif
 511 } configt;
 512
 513 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 514 typedef struct
 515 {
 516         char *key;
 517         int offset;
 518         int size;
 519         enum config_typet type;
 520 } config_descriptt;
 521
 522 typedef struct
 523 {
 524         uint8_t op;     // operation
 525 #define FILTER_PORT_OP_NONE     0 // all ports match
 526 #define FILTER_PORT_OP_EQ       1
 527 #define FILTER_PORT_OP_NEQ      2
 528 #define FILTER_PORT_OP_GT       3
 529 #define FILTER_PORT_OP_LT       4
 530 #define FILTER_PORT_OP_RANGE    5
 531         uint16_t port;  // port (host byte order)
 532         uint16_t port2; // range
 533 } ip_filter_portt;
 534
 535 typedef struct
 536 {
 537         int action;             // permit/deny
 538 #define FILTER_ACTION_DENY      1
 539 #define FILTER_ACTION_PERMIT    2
 540         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 541         in_addr_t src_ip;       // source ip (network byte order)
 542         in_addr_t src_wild;
 543         ip_filter_portt src_ports;
 544         in_addr_t dst_ip;       // dest ip
 545         in_addr_t dst_wild;
 546         ip_filter_portt dst_ports;
 547         uint8_t frag;           // apply to non-initial fragments
 548         uint8_t tcp_flag_op;    // match type: any, all, established
 549 #define FILTER_FLAG_OP_ANY      1
 550 #define FILTER_FLAG_OP_ALL      2
 551 #define FILTER_FLAG_OP_EST      3
 552         uint8_t tcp_sflags;     // flags set
 553         uint8_t tcp_cflags;     // flags clear
 554         uint32_t counter;       // match count
 555 } ip_filter_rulet;
 556
 557 #define TCP_FLAG_FIN    0x01
 558 #define TCP_FLAG_SYN    0x02
 559 #define TCP_FLAG_RST    0x04
 560 #define TCP_FLAG_PSH    0x08
 561 #define TCP_FLAG_ACK    0x10
 562 #define TCP_FLAG_URG    0x20
 563
 564 #define MAXFILTER               32
 565 #define MAXFILTER_RULES         32
 566 typedef struct
 567 {
 568         char name[32];          // ACL name
 569         int extended;           // type: 0 = standard, 1 = extended
 570         ip_filter_rulet rules[MAXFILTER_RULES];
 571         int used;               // session ref count
 572 } ip_filtert;
 573
 574 // arp.c
 575 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 576
 577
 578 // ppp.c
 579 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 580 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 581 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 582 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 583 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 584 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 585 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 586 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 587 void sendchap(tunnelidt t, sessionidt s);
 588 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 589 void initlcp(tunnelidt t, sessionidt s);
 590 void send_ipin(sessionidt s, uint8_t *buf, int len);
 591
 592
 593 // radius.c
 594 void initrad(void);
 595 void radiussend(uint16_t r, uint8_t state);
 596 void processrad(uint8_t *buf, int len, char socket_index);
 597 void radiusretry(uint16_t r);
 598 uint16_t radiusnew(sessionidt s);
 599 void radiusclear(uint16_t r, sessionidt s);
 600
 601
 602 // l2tpns.c
 603 clockt backoff(uint8_t try);
 604 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 605 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 606 sessionidt sessionbyip(in_addr_t ip);
 607 sessionidt sessionbyipv6(struct in6_addr ip);
 608 sessionidt sessionbyuser(char *username);
 609 void random_data(uint8_t *buf, int len);
 610 void sessionkill(sessionidt s, char *reason);
 611 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 612 void send_garp(in_addr_t ip);
 613 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 614 void sendipcp(tunnelidt t, sessionidt s);
 615 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 616 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 617 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 618 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 619 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 620 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 621
 622 #undef LOG
 623 #undef LOG_HEX
 624 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 625 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 626
 627 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 628 void _log_hex(int level, const char *title, const char *data, int maxsize);
 629
 630 int sessionsetup(tunnelidt t, sessionidt s);
 631 int run_plugins(int plugin_type, void *data);
 632 void rebuild_address_pool(void);
 633 void throttle_session(sessionidt s, int rate_in, int rate_out);
 634 int load_session(sessionidt, sessiont *);
 635 void become_master(void);       // We're the master; kick off any required master initializations.
 636
 637
 638 // cli.c
 639 void init_cli(char *hostname);
 640 void cli_do_file(FILE *fh);
 641 void cli_do(int sockfd);
 642 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 643
 644
 645 // icmp.c
 646 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 647
 648
 649 extern tunnelt *tunnel;
 650 extern sessiont *session;
 651 extern sessionlocalt *sess_local;
 652 extern ippoolt *ip_address_pool;
 653 #define sessionfree (session[0].next)
 654
 655 #define log_backtrace(count, max) \
 656 if (count++ < max) { \
 657         void *array[20]; \
 658         char **strings; \
 659         int size, i; \
 660         LOG(0, 0, t, "Backtrace follows"); \
 661         size = backtrace(array, 10); \
 662         strings = backtrace_symbols(array, size); \
 663         if (strings) for (i = 0; i < size; i++) \
 664         { \
 665                 LOG(0, 0, t, "%s\n", strings[i]); \
 666         } \
 667         free(strings); \
 668 }
 669
 670
 671 extern configt *config;
 672 extern time_t basetime;         // Time when this process started.
 673 extern time_t time_now;         // Seconds since EPOCH.
 674 extern uint32_t last_id;
 675 extern struct Tstats *_statistics;
 676 extern in_addr_t my_address;
 677 extern int tun_write(uint8_t *data, int size);
 678 extern int clifd;
 679
 680
 681 #define TIME (config->current_time)
 682
 683 // macros for handling help in cli commands
 684 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 685 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 686
 687 // CVS identifiers (for "show version file")
 688 extern char const *cvs_id_arp;
 689 extern char const *cvs_id_cli;
 690 extern char const *cvs_id_cluster;
 691 extern char const *cvs_id_constants;
 692 extern char const *cvs_id_control;
 693 extern char const *cvs_id_icmp;
 694 extern char const *cvs_id_l2tpns;
 695 extern char const *cvs_id_ll;
 696 extern char const *cvs_id_md5;
 697 extern char const *cvs_id_ppp;
 698 extern char const *cvs_id_radius;
 699 extern char const *cvs_id_tbf;
 700 extern char const *cvs_id_util;
 701
 702 #endif /* __L2TPNS_H__ */