l2tpns.h

   1 // L2TPNS Global Stuff
   2 // $Id: l2tpns.h,v 1.65 2005/05/05 10:02:08 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         uint32_t 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         uint16_t throttle_in;           // upstream throttle rate (kbps)
 178         uint16_t throttle_out;          // downstream throttle rate
 179         clockt opened;                  // when started
 180         clockt die;                     // being closed, when to finally free
 181         time_t last_packet;             // Last packet from the user (used for idle timeouts)
 182         in_addr_t dns1, dns2;           // DNS servers
 183         routet route[MAXROUTE];         // static routes
 184         uint16_t mru;                   // maximum receive unit
 185         uint16_t tbf_in;                // filter bucket for throttling in from the user.
 186         uint16_t tbf_out;               // filter bucket for throttling out to the user.
 187         uint8_t l2tp_flags;             // various bit flags from the ICCN on the l2tp tunnel.
 188         uint32_t flags;                 // Various session flags.
 189         uint8_t walled_garden;          // is this session gardened?
 190         char random_vector[MAXTEL];
 191         int random_vector_length;
 192         char user[MAXUSER];             // user (needed in seesion for radius stop messages)
 193         char called[MAXTEL];            // called number
 194         char calling[MAXTEL];           // calling number
 195         uint32_t tx_connect_speed;
 196         uint32_t rx_connect_speed;
 197         in_addr_t snoop_ip;             // Interception destination IP
 198         uint16_t snoop_port;            // Interception destination port
 199         uint8_t filter_in;              // input filter index (to ip_filters[N-1]; 0 if none)
 200         uint8_t filter_out;             // output filter index
 201         struct in6_addr ipv6route;      // Static IPv6 route
 202         uint8_t ipv6prefixlen;          // IPv6 route prefix length
 203         char reserved[1];               // Space to expand structure without changing HB_VERSION
 204 }
 205 sessiont;
 206
 207 #define SF_IPCP_ACKED   1       // Has this session seen an IPCP Ack?
 208 #define SF_LCP_ACKED    2       // LCP negotiated
 209 #define SF_CCP_ACKED    4       // CCP negotiated
 210 #define SF_IPV6CP_ACKED 8       // IPv6 negotiated
 211 #define SF_IPV6_NACKED  16      // IPv6 rejected
 212 #define SF_IPV6_ROUTED  32      // advertised v6 route
 213
 214 #define AUTHPAP         1       // allow PAP
 215 #define AUTHCHAP        2       // allow CHAP
 216
 217 typedef struct
 218 {
 219         // byte counters
 220         uint32_t cin;
 221         uint32_t cout;
 222
 223         // DoS prevention
 224         clockt last_packet_out;
 225         uint32_t packets_out;
 226         uint32_t packets_dropped;
 227
 228         // RADIUS session in use
 229         uint16_t radius;
 230
 231         // interim RADIUS
 232         time_t last_interim;
 233 } sessionlocalt;
 234
 235 #define SESSIONPFC      1       // PFC negotiated flags
 236 #define SESSIONACFC     2       // ACFC negotiated flags
 237
 238 // 168 bytes per tunnel
 239 typedef struct
 240 {
 241         tunnelidt far;          // far end tunnel ID
 242         in_addr_t ip;           // Ip for far end
 243         uint16_t port;          // port for far end
 244         uint16_t window;        // Rx window
 245         uint16_t nr;            // next receive
 246         uint16_t ns;            // next send
 247         int state;              // current state (tunnelstate enum)
 248         clockt last;            // when last control message sent (used for resend timeout)
 249         clockt retry;           // when to try resenting pending control
 250         clockt die;             // being closed, when to finally free
 251         clockt lastrec;         // when the last control message was received
 252         char hostname[128];     // tunnel hostname
 253         char vendor[128];       // LAC vendor
 254         uint8_t try;            // number of retrys on a control message
 255         uint16_t controlc;      // outstaind messages in queue
 256         controlt *controls;     // oldest message
 257         controlt *controle;     // newest message
 258 }
 259 tunnelt;
 260
 261 // 180 bytes per radius session
 262 typedef struct                  // outstanding RADIUS requests
 263 {
 264         sessionidt session;     // which session this applies to
 265         hasht auth;             // request authenticator
 266         clockt retry;           // when to try next
 267         char calling[MAXTEL];   // calling number
 268         char pass[129];         // password
 269         uint8_t id;             // ID for PPP response
 270         uint8_t try;            // which try we are on
 271         uint8_t state;          // state of radius requests
 272         uint8_t chap;           // set if CHAP used (is CHAP identifier)
 273 }
 274 radiust;
 275
 276 typedef struct
 277 {
 278         in_addr_t       address;        // Host byte order..
 279         char            assigned;       // 1 if assigned, 0 if free
 280         sessionidt      session;
 281         clockt          last;           // last used
 282         char            user[129];      // user (try to have ip addresses persistent)
 283 }
 284 ippoolt;
 285
 286 #ifdef RINGBUFFER
 287 struct Tringbuffer
 288 {
 289         struct {
 290                 char level;
 291                 sessionidt session;
 292                 tunnelidt tunnel;
 293                 char message[MAX_LOG_LENGTH];
 294         } buffer[RINGBUFFER_SIZE];
 295         int head;
 296         int tail;
 297 };
 298 #endif
 299
 300 /*
 301  * Possible tunnel states
 302  * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
 303  */
 304 enum
 305 {
 306         TUNNELFREE,             // Not in use
 307         TUNNELOPEN,             // Active tunnel
 308         TUNNELDIE,              // Currently closing
 309         TUNNELOPENING,          // Busy opening
 310         TUNNELUNDEF,            // Undefined
 311 };
 312
 313 enum
 314 {
 315         RADIUSNULL,             // Not in use
 316         RADIUSCHAP,             // sending CHAP down PPP
 317         RADIUSAUTH,             // sending auth to RADIUS server
 318         RADIUSIPCP,             // sending IPCP to end user
 319         RADIUSSTART,            // sending start accounting to RADIUS server
 320         RADIUSSTOP,             // sending stop accounting to RADIUS server
 321         RADIUSINTERIM,          // sending interim accounting to RADIUS server
 322         RADIUSWAIT,             // waiting timeout before available, in case delayed replies
 323 };
 324
 325 struct Tstats
 326 {
 327     time_t      start_time;
 328     time_t      last_reset;
 329
 330     uint32_t    tun_rx_packets;
 331     uint32_t    tun_tx_packets;
 332     uint32_t    tun_rx_bytes;
 333     uint32_t    tun_tx_bytes;
 334     uint32_t    tun_rx_errors;
 335     uint32_t    tun_tx_errors;
 336     uint32_t    tun_rx_dropped;
 337
 338     uint32_t    tunnel_rx_packets;
 339     uint32_t    tunnel_tx_packets;
 340     uint32_t    tunnel_rx_bytes;
 341     uint32_t    tunnel_tx_bytes;
 342     uint32_t    tunnel_rx_errors;
 343     uint32_t    tunnel_tx_errors;
 344
 345     uint32_t    tunnel_retries;
 346     uint32_t    radius_retries;
 347
 348     uint32_t    arp_sent;
 349
 350     uint32_t    packets_snooped;
 351
 352     uint32_t    tunnel_created;
 353     uint32_t    session_created;
 354     uint32_t    tunnel_timeout;
 355     uint32_t    session_timeout;
 356     uint32_t    radius_timeout;
 357     uint32_t    radius_overflow;
 358     uint32_t    tunnel_overflow;
 359     uint32_t    session_overflow;
 360
 361     uint32_t    ip_allocated;
 362     uint32_t    ip_freed;
 363
 364     uint32_t    c_forwarded;
 365     uint32_t    recv_forward;
 366
 367     uint32_t    select_called;
 368     uint32_t    multi_read_used;
 369     uint32_t    multi_read_exceeded;
 370
 371 #ifdef STATISTICS
 372     uint32_t    call_processtun;
 373     uint32_t    call_processipout;
 374     uint32_t    call_processipv6out;
 375     uint32_t    call_processudp;
 376     uint32_t    call_sessionbyip;
 377     uint32_t    call_sessionbyipv6;
 378     uint32_t    call_sessionbyuser;
 379     uint32_t    call_sendarp;
 380     uint32_t    call_sendipcp;
 381     uint32_t    call_processipv6cp;
 382     uint32_t    call_tunnelsend;
 383     uint32_t    call_sessionkill;
 384     uint32_t    call_sessionshutdown;
 385     uint32_t    call_tunnelkill;
 386     uint32_t    call_tunnelshutdown;
 387     uint32_t    call_assign_ip_address;
 388     uint32_t    call_free_ip_address;
 389     uint32_t    call_dump_acct_info;
 390     uint32_t    call_sessionsetup;
 391     uint32_t    call_processpap;
 392     uint32_t    call_processchap;
 393     uint32_t    call_processlcp;
 394     uint32_t    call_processipcp;
 395     uint32_t    call_processipin;
 396     uint32_t    call_processipv6in;
 397     uint32_t    call_processccp;
 398     uint32_t    call_sendchap;
 399     uint32_t    call_processrad;
 400     uint32_t    call_radiussend;
 401     uint32_t    call_radiusretry;
 402     uint32_t    call_random_data;
 403 #endif
 404 };
 405
 406 #ifdef STATISTICS
 407
 408 #ifdef STAT_CALLS
 409 #define CSTAT(x)        STAT(call_ ## x)
 410 #else
 411 #define CSTAT(x)
 412 #endif
 413
 414 #define STAT(x)         (_statistics->x++)
 415 #define INC_STAT(x,y)   (_statistics->x += (y))
 416 #define GET_STAT(x)     (_statistics->x)
 417 #define SET_STAT(x, y)  (_statistics->x = (y))
 418 #else
 419 #define CSTAT(x)
 420 #define STAT(x)
 421 #define INC_STAT(x,y)
 422 #define GET_STAT(x)     0
 423 #define SET_STAT(x, y)
 424 #endif
 425
 426 typedef struct
 427 {
 428         int             debug;                          // debugging level
 429         time_t          start_time;                     // time when l2tpns was started
 430         char            bandwidth[256];                 // current bandwidth
 431         char            pid_file[256];                  // file to write PID to on startup
 432         int             wrote_pid;
 433         clockt          current_time;                   // 1/10ths of a second since the process started.
 434                                                         // means that we can only run a given process
 435                                                         // for 13 years without re-starting!
 436
 437         char            config_file[128];
 438         int             reload_config;                  // flag to re-read config (set by cli)
 439         int             cleanup_interval;               // interval between regular cleanups (in seconds)
 440         int             multi_read_count;               // amount of packets to read per fd in processing loop
 441
 442         char            tundevice[10];                  // tun device name
 443         char            log_filename[128];
 444         char            l2tpsecret[64];
 445
 446         char            random_device[256];             // random device path, defaults to RANDOMDEVICE
 447
 448         char            radiussecret[64];
 449         int             radius_accounting;
 450         int             radius_interim;
 451         in_addr_t       radiusserver[MAXRADSERVER];     // radius servers
 452         uint16_t        radiusport[MAXRADSERVER];       // radius base ports
 453         uint8_t         numradiusservers;               // radius server count
 454         short           num_radfds;                     // Number of radius filehandles allocated
 455
 456         char            radius_authtypes_s[32];         // list of valid authentication types (chap, pap) in order of preference
 457         int             radius_authtypes;
 458         int             radius_authprefer;
 459
 460         in_addr_t       default_dns1, default_dns2;
 461
 462         unsigned long   rl_rate;                        // default throttle rate
 463         int             num_tbfs;                       // number of throttle buckets
 464
 465         char            accounting_dir[128];
 466         in_addr_t       bind_address;
 467         in_addr_t       peer_address;
 468         int             send_garp;                      // Set to true to garp for vip address on startup
 469
 470         int             target_uid;
 471         int             dump_speed;
 472         char            plugins[64][MAXPLUGINS];
 473         char            old_plugins[64][MAXPLUGINS];
 474
 475         int             next_tbf;                       // Next HTB id available to use
 476         int             scheduler_fifo;                 // If the system has multiple CPUs, use FIFO scheduling policy for this process.
 477         int             lock_pages;                     // Lock pages into memory.
 478         int             icmp_rate;                      // Max number of ICMP unreachable per second to send
 479         int             max_packets;                    // DoS prevention: per session limit of packets/0.1s
 480
 481         in_addr_t       cluster_address;                // Multicast address of cluster.
 482                                                         // Send to this address to have everyone hear.
 483         char            cluster_interface[64];          // Which interface to listen for multicast on.
 484         int             cluster_iam_master;             // Are we the cluster master???
 485         int             cluster_iam_uptodate;           // Set if we've got a full set of state from the master.
 486         in_addr_t       cluster_master_address;         // The network address of the cluster master.
 487                                                         // Zero if i am the cluster master.
 488         int             cluster_seq_number;             // Sequence number of the next heartbeat we'll send out
 489                                                         // (or the seq number we're next expecting if we're a slave).
 490         int             cluster_undefined_sessions;     // How many sessions we're yet to receive from the master.
 491         int             cluster_undefined_tunnels;      // How many tunnels we're yet to receive from the master.
 492         int             cluster_highest_sessionid;
 493         int             cluster_highest_tunnelid;
 494         clockt          cluster_last_hb;                // Last time we saw a heartbeat from the master.
 495         int             cluster_num_changes;            // Number of changes queued.
 496
 497         int             cluster_hb_interval;            // How often to send a heartbeat.
 498         int             cluster_hb_timeout;             // How many missed heartbeats trigger an election.
 499         uint64_t        cluster_table_version;          // # state changes processed by cluster
 500
 501         struct in6_addr ipv6_prefix;                    // Our IPv6 network pool.
 502
 503 #ifdef BGP
 504 #define BGP_NUM_PEERS   2
 505         uint16_t as_number;
 506         struct {
 507                 char name[64];
 508                 uint16_t as;
 509                 int keepalive;
 510                 int hold;
 511         } neighbour[BGP_NUM_PEERS];
 512 #endif
 513 } configt;
 514
 515 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
 516 typedef struct
 517 {
 518         char *key;
 519         int offset;
 520         int size;
 521         enum config_typet type;
 522 } config_descriptt;
 523
 524 typedef struct
 525 {
 526         uint8_t op;     // operation
 527 #define FILTER_PORT_OP_NONE     0 // all ports match
 528 #define FILTER_PORT_OP_EQ       1
 529 #define FILTER_PORT_OP_NEQ      2
 530 #define FILTER_PORT_OP_GT       3
 531 #define FILTER_PORT_OP_LT       4
 532 #define FILTER_PORT_OP_RANGE    5
 533         uint16_t port;  // port (host byte order)
 534         uint16_t port2; // range
 535 } ip_filter_portt;
 536
 537 typedef struct
 538 {
 539         int action;             // permit/deny
 540 #define FILTER_ACTION_DENY      1
 541 #define FILTER_ACTION_PERMIT    2
 542         uint8_t proto;          // protocol: IPPROTO_* (netinet/in.h)
 543         in_addr_t src_ip;       // source ip (network byte order)
 544         in_addr_t src_wild;
 545         ip_filter_portt src_ports;
 546         in_addr_t dst_ip;       // dest ip
 547         in_addr_t dst_wild;
 548         ip_filter_portt dst_ports;
 549         uint8_t frag;           // apply to non-initial fragments
 550         uint8_t tcp_flag_op;    // match type: any, all, established
 551 #define FILTER_FLAG_OP_ANY      1
 552 #define FILTER_FLAG_OP_ALL      2
 553 #define FILTER_FLAG_OP_EST      3
 554         uint8_t tcp_sflags;     // flags set
 555         uint8_t tcp_cflags;     // flags clear
 556         uint32_t counter;       // match count
 557 } ip_filter_rulet;
 558
 559 #define TCP_FLAG_FIN    0x01
 560 #define TCP_FLAG_SYN    0x02
 561 #define TCP_FLAG_RST    0x04
 562 #define TCP_FLAG_PSH    0x08
 563 #define TCP_FLAG_ACK    0x10
 564 #define TCP_FLAG_URG    0x20
 565
 566 #define MAXFILTER               32
 567 #define MAXFILTER_RULES         32
 568 typedef struct
 569 {
 570         char name[32];          // ACL name
 571         int extended;           // type: 0 = standard, 1 = extended
 572         ip_filter_rulet rules[MAXFILTER_RULES];
 573         int used;               // session ref count
 574 } ip_filtert;
 575
 576 // arp.c
 577 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
 578
 579
 580 // ppp.c
 581 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 582 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 583 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 584 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 585 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 586 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 587 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 588 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
 589 void sendchap(tunnelidt t, sessionidt s);
 590 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
 591 void initlcp(tunnelidt t, sessionidt s);
 592 void send_ipin(sessionidt s, uint8_t *buf, int len);
 593
 594
 595 // radius.c
 596 void initrad(void);
 597 void radiussend(uint16_t r, uint8_t state);
 598 void processrad(uint8_t *buf, int len, char socket_index);
 599 void radiusretry(uint16_t r);
 600 uint16_t radiusnew(sessionidt s);
 601 void radiusclear(uint16_t r, sessionidt s);
 602
 603
 604 // l2tpns.c
 605 clockt backoff(uint8_t try);
 606 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
 607 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
 608 sessionidt sessionbyip(in_addr_t ip);
 609 sessionidt sessionbyipv6(struct in6_addr ip);
 610 sessionidt sessionbyuser(char *username);
 611 void random_data(uint8_t *buf, int len);
 612 void sessionkill(sessionidt s, char *reason);
 613 void sessionshutdown(sessionidt s, char *reason, int result, int error);
 614 void send_garp(in_addr_t ip);
 615 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
 616 void sendipcp(tunnelidt t, sessionidt s);
 617 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
 618 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
 619 int ip_filter(uint8_t *buf, int len, uint8_t filter);
 620 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
 621 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
 622 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
 623
 624 #undef LOG
 625 #undef LOG_HEX
 626 #define LOG(D, s, t, f, ...)    ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
 627 #define LOG_HEX(D, t, d, s)     ({ if (D <= config->debug) _log_hex(D, t, d, s); })
 628
 629 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 630 void _log_hex(int level, const char *title, const char *data, int maxsize);
 631
 632 int sessionsetup(tunnelidt t, sessionidt s);
 633 int run_plugins(int plugin_type, void *data);
 634 void rebuild_address_pool(void);
 635 void throttle_session(sessionidt s, int rate_in, int rate_out);
 636 int load_session(sessionidt, sessiont *);
 637 void become_master(void);       // We're the master; kick off any required master initializations.
 638
 639
 640 // cli.c
 641 void init_cli(char *hostname);
 642 void cli_do_file(FILE *fh);
 643 void cli_do(int sockfd);
 644 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
 645
 646
 647 // icmp.c
 648 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
 649
 650
 651 extern tunnelt *tunnel;
 652 extern sessiont *session;
 653 extern sessionlocalt *sess_local;
 654 extern ippoolt *ip_address_pool;
 655 #define sessionfree (session[0].next)
 656
 657 #define log_backtrace(count, max) \
 658 if (count++ < max) { \
 659         void *array[20]; \
 660         char **strings; \
 661         int size, i; \
 662         LOG(0, 0, t, "Backtrace follows"); \
 663         size = backtrace(array, 10); \
 664         strings = backtrace_symbols(array, size); \
 665         if (strings) for (i = 0; i < size; i++) \
 666         { \
 667                 LOG(0, 0, t, "%s\n", strings[i]); \
 668         } \
 669         free(strings); \
 670 }
 671
 672
 673 extern configt *config;
 674 extern time_t basetime;         // Time when this process started.
 675 extern time_t time_now;         // Seconds since EPOCH.
 676 extern uint32_t last_id;
 677 extern struct Tstats *_statistics;
 678 extern in_addr_t my_address;
 679 extern int tun_write(uint8_t *data, int size);
 680 extern int clifd;
 681
 682
 683 #define TIME (config->current_time)
 684
 685 // macros for handling help in cli commands
 686 #define CLI_HELP_REQUESTED      (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
 687 #define CLI_HELP_NO_ARGS        (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
 688
 689 // CVS identifiers (for "show version file")
 690 extern char const *cvs_id_arp;
 691 extern char const *cvs_id_cli;
 692 extern char const *cvs_id_cluster;
 693 extern char const *cvs_id_constants;
 694 extern char const *cvs_id_control;
 695 extern char const *cvs_id_icmp;
 696 extern char const *cvs_id_l2tpns;
 697 extern char const *cvs_id_ll;
 698 extern char const *cvs_id_md5;
 699 extern char const *cvs_id_ppp;
 700 extern char const *cvs_id_radius;
 701 extern char const *cvs_id_tbf;
 702 extern char const *cvs_id_util;
 703
 704 #endif /* __L2TPNS_H__ */