l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.80 2005-06-28 14:48:27 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 "2.1.2"
  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_FDS      (1 << RADIUS_SHIFT)
  27 #define RADIUS_MASK     ((1 << RADIUS_SHIFT) - 1)
  28 #define MAXRADIUS       (1 << (8 + RADIUS_SHIFT))
  29
  30 #define T_UNDEF         (0xffff)        // A tunnel ID that won't ever be used. Mark session as undefined.
  31 #define T_FREE          (0)             // A tunnel ID that won't ever be used. Mark session as free.
  32
  33 #define MAXCONTROL      1000            // max length control message we ever send...
  34 #define MAXETHER        (1500+18)       // max packet we try sending to tun
  35 #define MAXTEL          96              // telephone number
  36 #define MAXUSER         128             // username
  37 #define MAXPASS         128             // password
  38 #define MAXPLUGINS      20              // maximum number of plugins to load
  39 #define MAXRADSERVER    10              // max radius servers
  40 #define MAXROUTE        10              // max static routes per session
  41 #define MAXIPPOOL       131072          // max number of ip addresses in pool
  42 #define RINGBUFFER_SIZE 10000           // Number of ringbuffer entries to allocate
  43 #define MAX_LOG_LENGTH  512             // Maximum size of log message
  44 #define ECHO_TIMEOUT    60              // Time between last packet sent and LCP ECHO generation
  45 #define IDLE_TIMEOUT    240             // Time between last packet sent and LCP ECHO generation
  46 #define BUSY_WAIT_TIME  3000            // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
  47 #define DEFAULT_MRU     1452            // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
  48
  49 // Constants
  50 #ifndef ETCDIR
  51 #define ETCDIR          "/etc/l2tpns"
  52 #endif
  53
  54 #ifndef LIBDIR
  55 #define LIBDIR          "/usr/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 #define TUNDEVICE       "/dev/net/tun"
  71 #define RANDOMDEVICE    "/dev/urandom"                  // default, not as secure as /dev/random but non-blocking
  72 #define CONFIGFILE      FLASHDIR "/startup-config"      // Configuration file
  73 #define CLIUSERS        FLASHDIR "/users"               // CLI Users file
  74 #define IPPOOLFILE      FLASHDIR "/ip_pool"             // Address pool configuration
  75 #define ACCT_TIME       3000            // 5 minute accounting interval
  76 #define ACCT_SHUT_TIME  600             // 1 minute for counters of shutdown sessions
  77 #define L2TPPORT        1701            // L2TP port
  78 #define RADPORT         1645            // old radius port...
  79 #define DAEPORT         3799            // DAE port
  80 #define PKTARP          0x0806          // ARP packet type
  81 #define PKTIP           0x0800          // IPv4 packet type
  82 #define PKTIPV6         0x86DD          // IPv6 packet type
  83 #define PPPPAP          0xC023
  84 #define PPPCHAP         0xC223
  85 #define PPPLCP          0xC021
  86 #define PPPIPCP         0x8021
  87 #define PPPIPV6CP       0x8057
  88 #define PPPCCP          0x80FD
  89 #define PPPIP           0x0021
  90 #define PPPIPV6         0x0057
  91 #define PPPMP           0x003D
  92 #define MIN_IP_SIZE     0x19
  93
  94 enum {
  95         ConfigReq = 1,
  96         ConfigAck,
  97         ConfigNak,
  98         ConfigRej,
  99         TerminateReq,
 100         TerminateAck,
 101         CodeRej,
 102         ProtocolRej,
 103         EchoReq,
 104         EchoReply,
 105         DiscardRequest,
 106         IdentRequest
 107 };
 108
 109 enum {
 110         AccessRequest = 1,
 111         AccessAccept,
 112         AccessReject,
 113         AccountingRequest,
 114         AccountingResponse,
 115         AccessChallenge = 11,
 116         DisconnectRequest = 40,
 117         DisconnectACK,
 118         DisconnectNAK,
 119         CoARequest,
 120         CoAACK,
 121         CoANAK
 122 };
 123
 124 // Types
 125 typedef uint16_t sessionidt;
 126 typedef uint16_t tunnelidt;
 127 typedef uint32_t clockt;
 128 typedef uint8_t hasht[16];
 129
 130 // CLI actions
 131 struct cli_session_actions {
 132         char action;
 133         in_addr_t snoop_ip;
 134         uint16_t snoop_port;
 135         int throttle_in;
 136         int throttle_out;
 137         int filter_in;
 138         int filter_out;
 139 };
 140
 141 #define CLI_SESS_KILL           0x01
 142 #define CLI_SESS_SNOOP          0x02
 143 #define CLI_SESS_NOSNOOP        0x04
 144 #define CLI_SESS_THROTTLE       0x08
 145 #define CLI_SESS_NOTHROTTLE     0x10
 146 #define CLI_SESS_FILTER         0x20
 147 #define CLI_SESS_NOFILTER       0x40
 148
 149 struct cli_tunnel_actions {
 150         char action;
 151 };
 152
 153 #define CLI_TUN_KILL            0x01
 154
 155 // structures
 156 typedef struct                  // route
 157 {
 158         in_addr_t ip;
 159         in_addr_t mask;
 160 }
 161 routet;
 162
 163 typedef struct controls         // control message
 164 {
 165         struct controls *next;  // next in queue
 166         uint16_t length;        // length
 167         uint8_t buf[MAXCONTROL];
 168 }
 169 controlt;
 170
 171 typedef struct
 172 {
 173         sessionidt next;                // next session in linked list
 174         sessionidt far;                 // far end session ID
 175         tunnelidt tunnel;               // near end tunnel ID
 176         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 177         uint8_t flags;                  // Various session flags.
 178         in_addr_t ip;                   // IP of session set by RADIUS response (host byte order).
 179         int ip_pool_index;              // index to IP pool
 180         uint32_t unique_id;             // unique session id
 181         uint16_t nr;                    // next receive
 182         uint16_t ns;                    // next send
 183         uint32_t magic;                 // ppp magic number
 184         uint32_t pin, pout;             // packet counts
 185         uint32_t cin, cout;             // byte counts
 186         uint32_t cin_wrap, cout_wrap;   // byte counter wrap count (RADIUS accounting giagawords)
 187         uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
 188         uint16_t throttle_in;           // upstream throttle rate (kbps)
 189         uint16_t throttle_out;          // downstream throttle rate
 190         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 191         uint8_t filter_out;             // output filter index
 192         uint16_t mru;                   // maximum receive unit
 193         clockt opened;                  // when started
 194         clockt die;                     // being closed, when to finally free
 195         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 196         in_addr_t dns1, dns2;           // DNS servers
 197         routet route[MAXROUTE];         // static routes
 198         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 199         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 200         int random_vector_length;
 201         char random_vector[MAXTEL];
 202         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 203         char called[MAXTEL];            // called number
 204         char calling[MAXTEL];           // calling number
 205         uint32_t tx_connect_speed;
 206         uint32_t rx_connect_speed;
 207         in_addr_t snoop_ip;             // Interception destination IP
 208         uint16_t snoop_port;            // Interception destination port
 209         uint8_t walled_garden;          // is this session gardened?
 210         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 211         struct in6_addr ipv6route;      // Static IPv6 route
 212         char reserved[16];              // Space to expand structure without changing HB_VERSION
 213 }
 214 sessiont;
 215
 216 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 217 #define SF_LCP_ACKED    2       // LCP negotiated
 218 #define SF_CCP_ACKED    4       // CCP negotiated
 219 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 220 #define SF_IPV6_NACKED  16      // IPv6 rejected
 221 #define SF_IPV6_ROUTED  32      // advertised v6 route
 222
 223 #define AUTHPAP         1       // allow PAP
 224 #define AUTHCHAP        2       // allow CHAP
 225
 226 typedef struct
 227 {
 228         // packet counters
 229         uint32_t pin;
 230         uint32_t pout;
 231
 232         // byte counters
 233         uint32_t cin;
 234         uint32_t cout;
 235
 236         // DoS prevention
 237         clockt last_packet_out;
 238         uint32_t packets_out;
 239         uint32_t packets_dropped;
 240
 241         // RADIUS session in use
 242         uint16_t radius;
 243
 244         // interim RADIUS
 245         time_t last_interim;
 246 } sessionlocalt;
 247
 248 #define SESSIONPFC      1       // PFC negotiated flags
 249 #define SESSIONACFC     2       // ACFC negotiated flags
 250
 251 // 168 bytes per tunnel
 252 typedef struct
 253 {
 254         tunnelidt far;          // far end tunnel ID
 255         in_addr_t ip;           // Ip for far end
 256         uint16_t port;          // port for far end
 257         uint16_t window;        // Rx window
 258         uint16_t nr;            // next receive
 259         uint16_t ns;            // next send
 260         int state;              // current state (tunnelstate enum)
 261         clockt last;            // when last control message sent (used for resend timeout)
 262         clockt retry;           // when to try resenting pending control
 263         clockt die;             // being closed, when to finally free
 264         clockt lastrec;         // when the last control message was received
 265         char hostname[128];     // tunnel hostname
 266         char vendor[128];       // LAC vendor
 267         uint8_t try;            // number of retrys on a control message
 268         uint16_t controlc;      // outstaind messages in queue
 269         controlt *controls;     // oldest message
 270         controlt *controle;     // newest message
 271 }
 272 tunnelt;
 273
 274 // 180 bytes per radius session
 275 typedef struct                  // outstanding RADIUS requests
 276 {
 277         sessionidt session;     // which session this applies to
 278         hasht auth;             // request authenticator
 279         clockt retry;           // when to try next
 280         char calling[MAXTEL];   // calling number
 281         char pass[129];         // password
 282         uint8_t id;             // ID for PPP response
 283         uint8_t try;            // which try we are on
 284         uint8_t state;          // state of radius requests
 285         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 286 }
 287 radiust;
 288
 289 typedef struct
 290 {
 291         in_addr_t       address;        // Host byte order..
 292         char            assigned;       // 1 if assigned, 0 if free
 293         sessionidt      session;
 294         clockt          last;           // last used
 295         char            user[129];      // user (try to have ip addresses persistent)
 296 }
 297 ippoolt;
 298
 299 #ifdef RINGBUFFER
 300 struct Tringbuffer
 301 {
 302         struct {
 303                 char level;
 304                 sessionidt session;
 305                 tunnelidt tunnel;
 306                 char message[MAX_LOG_LENGTH];
 307         } buffer[RINGBUFFER_SIZE];
 308         int head;
 309         int tail;
 310 };
 311 #endif
 312
 313 /*
 314  * Possible tunnel states
 315  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 316  */
 317 enum
 318 {
 319         TUNNELFREE,             // Not in use
 320         TUNNELOPEN,             // Active tunnel
 321         TUNNELDIE,              // Currently closing
 322         TUNNELOPENING,          // Busy opening
 323         TUNNELUNDEF,            // Undefined
 324 };
 325
 326 enum
 327 {
 328         RADIUSNULL,             // Not in use
 329         RADIUSCHAP,             // sending CHAP down PPP
 330         RADIUSAUTH,             // sending auth to RADIUS server
 331         RADIUSIPCP,             // sending IPCP to end user
 332         RADIUSSTART,            // sending start accounting to RADIUS server
 333         RADIUSSTOP,             // sending stop accounting to RADIUS server
 334         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 335         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 336 };
 337
 338 struct Tstats
 339 {
 340     time_t      start_time;
 341     time_t      last_reset;
 342
 343     uint32_t    tun_rx_packets;
 344     uint32_t    tun_tx_packets;
 345     uint32_t    tun_rx_bytes;
 346     uint32_t    tun_tx_bytes;
 347     uint32_t    tun_rx_errors;
 348     uint32_t    tun_tx_errors;
 349     uint32_t    tun_rx_dropped;
 350
 351     uint32_t    tunnel_rx_packets;
 352     uint32_t    tunnel_tx_packets;
 353     uint32_t    tunnel_rx_bytes;
 354     uint32_t    tunnel_tx_bytes;
 355     uint32_t    tunnel_rx_errors;
 356     uint32_t    tunnel_tx_errors;
 357
 358     uint32_t    tunnel_retries;
 359     uint32_t    radius_retries;
 360
 361     uint32_t    arp_sent;
 362
 363     uint32_t    packets_snooped;
 364
 365     uint32_t    tunnel_created;
 366     uint32_t    session_created;
 367     uint32_t    tunnel_timeout;
 368     uint32_t    session_timeout;
 369     uint32_t    radius_timeout;
 370     uint32_t    radius_overflow;
 371     uint32_t    tunnel_overflow;
 372     uint32_t    session_overflow;
 373
 374     uint32_t    ip_allocated;
 375     uint32_t    ip_freed;
 376
 377     uint32_t    c_forwarded;
 378     uint32_t    recv_forward;
 379
 380     uint32_t    select_called;
 381     uint32_t    multi_read_used;
 382     uint32_t    multi_read_exceeded;
 383
 384 #ifdef STATISTICS
 385     uint32_t    call_processtun;
 386     uint32_t    call_processipout;
 387     uint32_t    call_processipv6out;
 388     uint32_t    call_processudp;
 389     uint32_t    call_sessionbyip;
 390     uint32_t    call_sessionbyipv6;
 391     uint32_t    call_sessionbyuser;
 392     uint32_t    call_sendarp;
 393     uint32_t    call_sendipcp;
 394     uint32_t    call_processipv6cp;
 395     uint32_t    call_tunnelsend;
 396     uint32_t    call_sessionkill;
 397     uint32_t    call_sessionshutdown;
 398     uint32_t    call_tunnelkill;
 399     uint32_t    call_tunnelshutdown;
 400     uint32_t    call_assign_ip_address;
 401     uint32_t    call_free_ip_address;
 402     uint32_t    call_dump_acct_info;
 403     uint32_t    call_sessionsetup;
 404     uint32_t    call_processpap;
 405     uint32_t    call_processchap;
 406     uint32_t    call_processlcp;
 407     uint32_t    call_processipcp;
 408     uint32_t    call_processipin;
 409     uint32_t    call_processipv6in;
 410     uint32_t    call_processccp;
 411     uint32_t    call_sendchap;
 412     uint32_t    call_processrad;
 413     uint32_t    call_radiussend;
 414     uint32_t    call_radiusretry;
 415     uint32_t    call_random_data;
 416 #endif
 417 };
 418
 419 #ifdef STATISTICS
 420
 421 #ifdef STAT_CALLS
 422 #define CSTAT(x)        STAT(call_ ## x)
 423 #else
 424 #define CSTAT(x)
 425 #endif
 426
 427 #define STAT(x)         (_statistics->x++)
 428 #define INC_STAT(x,y)   (_statistics->x += (y))
 429 #define GET_STAT(x)     (_statistics->x)
 430 #define SET_STAT(x, y)  (_statistics->x = (y))
 431 #else
 432 #define CSTAT(x)
 433 #define STAT(x)
 434 #define INC_STAT(x,y)
 435 #define GET_STAT(x)     0
 436 #define SET_STAT(x, y)
 437 #endif
 438
 439 typedef struct
 440 {
 441         int             debug;                          // debugging level
 442         time_t          start_time;                     // time when l2tpns was started
 443         char            bandwidth[256];                 // current bandwidth
 444         char            pid_file[256];                  // file to write PID to on startup
 445         int             wrote_pid;
 446         clockt          current_time;                   // 1/10ths of a second since the process started.
 447                                                         // means that we can only run a given process
 448                                                         // for 13 years without re-starting!
 449
 450         char            config_file[128];
 451         int             reload_config;                  // flag to re-read config (set by cli)
 452         int             multi_read_count;               // amount of packets to read per fd in processing loop
 453
 454         char            tundevice[10];                  // tun device name
 455         char            log_filename[128];
 456         char            l2tpsecret[64];
 457
 458         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 459
 460         char            radiussecret[64];
 461         int             radius_accounting;
 462         int             radius_interim;
 463         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 464         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 465         uint8_t         numradiusservers;               // radius server count
 466
 467         uint16_t        radius_dae_port;                // local port for radius dae
 468
 469         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 470         int             radius_authtypes;
 471         int             radius_authprefer;
 472
 473         int             allow_duplicate_users;          // allow multiple logins with the same username
 474
 475         in_addr_t       default_dns1, default_dns2;
 476
 477         unsigned long   rl_rate;                        // default throttle rate
 478         int             num_tbfs;                       // number of throttle buckets
 479
 480         char            accounting_dir[128];
 481         in_addr_t       bind_address;
 482         in_addr_t       peer_address;
 483         int             send_garp;                      // Set to true to garp for vip address on startup
 484
 485         int             target_uid;
 486         int             dump_speed;
 487         char            plugins[64][MAXPLUGINS];
 488         char            old_plugins[64][MAXPLUGINS];
 489
 490         int             next_tbf;                       // Next HTB id available to use
 491         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling
 492                                                         // policy for this process.
 493         int             lock_pages;                     // Lock pages into memory.
 494         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 495         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 496
 497         in_addr_t       cluster_address;                // Multicast address of cluster.
 498                                                         // Send to this address to have everyone hear.
 499         char            cluster_interface[64];          // Which interface to listen for multicast on.
 500         int             cluster_iam_master;             // Are we the cluster master???
 501         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 502         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 503                                                         // Zero if i am the cluster master.
 504         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 505                                                         // (or the seq number we're next expecting if we're a slave).
 506         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 507         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 508         int             cluster_highest_sessionid;
 509         int             cluster_highest_tunnelid;
 510         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 511         int             cluster_last_hb_ver;            // Heartbeat version last seen from master
 512         int             cluster_num_changes;            // Number of changes queued.
 513
 514         int             cluster_hb_interval;            // How often to send a heartbeat.
 515         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 516         uint64_t        cluster_table_version;          // # state changes processed by cluster
 517
 518         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 519
 520
 521         int             cluster_master_min_adv;         // Master advertises routes while the number of up to date
 522                                                         // slaves is less than this value.
 523
 524 #ifdef BGP
 525 #define BGP_NUM_PEERS   2
 526         uint16_t as_number;
 527         struct {
 528                 char name[64];
 529                 uint16_t as;
 530                 int keepalive;
 531                 int hold;
 532         } neighbour[BGP_NUM_PEERS];
 533 #endif
 534 } configt;
 535
 536 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 537 typedef struct
 538 {
 539         char *key;
 540         int offset;
 541         int size;
 542         enum config_typet type;
 543 } config_descriptt;
 544
 545 typedef struct
 546 {
 547         uint8_t op;     // operation
 548 #define FILTER_PORT_OP_NONE     0 // all ports match
 549 #define FILTER_PORT_OP_EQ       1
 550 #define FILTER_PORT_OP_NEQ      2
 551 #define FILTER_PORT_OP_GT       3
 552 #define FILTER_PORT_OP_LT       4
 553 #define FILTER_PORT_OP_RANGE    5
 554         uint16_t port;  // port (host byte order)
 555         uint16_t port2; // range
 556 } ip_filter_portt;
 557
 558 typedef struct
 559 {
 560         int action;             // permit/deny
 561 #define FILTER_ACTION_DENY      1
 562 #define FILTER_ACTION_PERMIT    2
 563         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 564         in_addr_t src_ip;       // source ip (network byte order)
 565         in_addr_t src_wild;
 566         ip_filter_portt src_ports;
 567         in_addr_t dst_ip;       // dest ip
 568         in_addr_t dst_wild;
 569         ip_filter_portt dst_ports;
 570         uint8_t frag;           // apply to non-initial fragments
 571         uint8_t tcp_flag_op;    // match type: any, all, established
 572 #define FILTER_FLAG_OP_ANY      1
 573 #define FILTER_FLAG_OP_ALL      2
 574 #define FILTER_FLAG_OP_EST      3
 575         uint8_t tcp_sflags;     // flags set
 576         uint8_t tcp_cflags;     // flags clear
 577         uint32_t counter;       // match count
 578 } ip_filter_rulet;
 579
 580 #define TCP_FLAG_FIN    0x01
 581 #define TCP_FLAG_SYN    0x02
 582 #define TCP_FLAG_RST    0x04
 583 #define TCP_FLAG_PSH    0x08
 584 #define TCP_FLAG_ACK    0x10
 585 #define TCP_FLAG_URG    0x20
 586
 587 #define MAXFILTER               32
 588 #define MAXFILTER_RULES         32
 589 typedef struct
 590 {
 591         char name[32];          // ACL name
 592         int extended;           // type: 0 = standard, 1 = extended
 593         ip_filter_rulet rules[MAXFILTER_RULES];
 594         int used;               // session ref count
 595 } ip_filtert;
 596
 597 // arp.c
 598 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 599
 600
 601 // ppp.c
 602 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 603 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 604 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 605 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 606 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 607 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 608 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 609 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 610 void sendchap(tunnelidt t, sessionidt s);
 611 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 612 void sendlcp(tunnelidt t, sessionidt s, int authtype);
 613 void send_ipin(sessionidt s, uint8_t *buf, int len);
 614
 615
 616 // radius.c
 617 void initrad(void);
 618 void radiussend(uint16_t r, uint8_t state);
 619 void processrad(uint8_t *buf, int len, char socket_index);
 620 void radiusretry(uint16_t r);
 621 uint16_t radiusnew(sessionidt s);
 622 void radiusclear(uint16_t r, sessionidt s);
 623 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
 624
 625
 626 // l2tpns.c
 627 clockt backoff(uint8_t try);
 628 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 629 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 630 sessionidt sessionbyip(in_addr_t ip);
 631 sessionidt sessionbyipv6(struct in6_addr ip);
 632 sessionidt sessionbyuser(char *username);
 633 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
 634 void random_data(uint8_t *buf, int len);
 635 void sessionkill(sessionidt s, char *reason);
 636 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 637 void filter_session(sessionidt s, int filter_in, int filter_out);
 638 void send_garp(in_addr_t ip);
 639 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 640 void sendipcp(tunnelidt t, sessionidt s);
 641 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 642 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 643 int find_filter(char const *name, size_t len);
 644 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 645 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 646 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 647 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 648
 649 #undef LOG
 650 #undef LOG_HEX
 651 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 652 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 653
 654 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 655 void _log_hex(int level, const char *title, const char *data, int maxsize);
 656
 657 int sessionsetup(tunnelidt t, sessionidt s);
 658 int run_plugins(int plugin_type, void *data);
 659 void rebuild_address_pool(void);
 660 void throttle_session(sessionidt s, int rate_in, int rate_out);
 661 int load_session(sessionidt, sessiont *);
 662 void become_master(void);       // We're the master; kick off any required master initializations.
 663
 664
 665 // cli.c
 666 void init_cli(char *hostname);
 667 void cli_do_file(FILE *fh);
 668 void cli_do(int sockfd);
 669 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 670
 671
 672 // icmp.c
 673 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 674
 675
 676 extern tunnelt *tunnel;
 677 extern sessiont *session;
 678 extern sessionlocalt *sess_local;
 679 extern ippoolt *ip_address_pool;
 680 #define sessionfree (session[0].next)
 681
 682 #define log_backtrace(count, max) \
 683 if (count++ < max) { \
 684         void *array[20]; \
 685         char **strings; \
 686         int size, i; \
 687         LOG(0, 0, t, "Backtrace follows:\n"); \
 688         size = backtrace(array, 10); \
 689         strings = backtrace_symbols(array, size); \
 690         if (strings) for (i = 0; i < size; i++) \
 691         { \
 692                 LOG(0, 0, t, " %s\n", strings[i]); \
 693         } \
 694         free(strings); \
 695 }
 696
 697
 698 extern configt *config;
 699 extern time_t basetime;         // Time when this process started.
 700 extern time_t time_now;         // Seconds since EPOCH.
 701 extern char main_quit;
 702 extern uint32_t last_id;
 703 extern struct Tstats *_statistics;
 704 extern in_addr_t my_address;
 705 extern int tun_write(uint8_t *data, int size);
 706 extern int clifd;
 707 extern int epollfd;
 708
 709 struct event_data {
 710         enum {
 711                 FD_TYPE_CLI,
 712                 FD_TYPE_CLUSTER,
 713                 FD_TYPE_TUN,
 714                 FD_TYPE_UDP,
 715                 FD_TYPE_CONTROL,
 716                 FD_TYPE_DAE,
 717                 FD_TYPE_RADIUS,
 718                 FD_TYPE_BGP,
 719         } type;
 720         int index; // for RADIUS, BGP
 721 };
 722
 723 #define TIME (config->current_time)
 724
 725 // macros for handling help in cli commands
 726 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 727 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 728
 729 // CVS identifiers (for "show version file")
 730 extern char const *cvs_id_arp;
 731 extern char const *cvs_id_cli;
 732 extern char const *cvs_id_cluster;
 733 extern char const *cvs_id_constants;
 734 extern char const *cvs_id_control;
 735 extern char const *cvs_id_icmp;
 736 extern char const *cvs_id_l2tpns;
 737 extern char const *cvs_id_ll;
 738 extern char const *cvs_id_md5;
 739 extern char const *cvs_id_ppp;
 740 extern char const *cvs_id_radius;
 741 extern char const *cvs_id_tbf;
 742 extern char const *cvs_id_util;
 743
 744 #endif /* __L2TPNS_H__ */