CHAP support from Jordan Hrycaj (work in progress)
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.51 2005-01-07 07:17:13 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 50000 // 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 MAXPLUGINS 20 // maximum number of plugins to load
36 #define MAXRADSERVER 10 // max radius servers
37 #define MAXROUTE 10 // max static routes per session
38 #define MAXIPPOOL 131072 // max number of ip addresses in pool
39 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
40 #define MAX_LOG_LENGTH 512 // Maximum size of log message
41 #define ECHO_TIMEOUT 60 // Time between last packet sent and LCP ECHO generation
42 #define IDLE_TIMEOUT 240 // Time between last packet sent and LCP ECHO generation
43 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
44
45 // Constants
46 #ifndef ETCDIR
47 #define ETCDIR "/etc/l2tpns"
48 #endif
49
50 #ifndef LIBDIR
51 #define LIBDIR "/usr/lib/l2tpns"
52 #endif
53
54 #ifndef STATEDIR
55 #define STATEDIR "/var/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 #ifndef DATADIR
71 #define DATADIR STATEDIR
72 #endif
73
74 #define TUNDEVICE "/dev/net/tun"
75 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
76 #define STATEFILE DATADIR "/state.dump" // State dump file
77 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
78 #define CLIUSERS FLASHDIR "/users" // CLI Users file
79 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
80 #define ACCT_TIME 3000 // 5 minute accounting interval
81 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
82 #define L2TPPORT 1701 // L2TP port
83 #define RADPORT 1645 // old radius port...
84 #define PKTARP 0x0806 // ARP packet type
85 #define PKTIP 0x0800 // IPv4 packet type
86 #define PKTIPV6 0x86DD // IPv6 packet type
87 #define PPPPAP 0xC023
88 #define PPPCHAP 0xC223
89 #define PPPLCP 0xC021
90 #define PPPIPCP 0x8021
91 #define PPPIPV6CP 0x8057
92 #define PPPCCP 0x80FD
93 #define PPPIP 0x0021
94 #define PPPIPV6 0x0057
95 #define PPPMP 0x003D
96 #define MIN_IP_SIZE 0x19
97
98 enum {
99 ConfigReq = 1,
100 ConfigAck,
101 ConfigNak,
102 ConfigRej,
103 TerminateReq,
104 TerminateAck,
105 CodeRej,
106 ProtocolRej,
107 EchoReq,
108 EchoReply,
109 DiscardRequest,
110 IdentRequest
111 };
112
113 enum {
114 AccessRequest = 1,
115 AccessAccept,
116 AccessReject,
117 AccountingRequest,
118 AccountingResponse,
119 AccessChallenge = 11
120 };
121
122 // Types
123 typedef uint16_t sessionidt;
124 typedef uint16_t tunnelidt;
125 typedef uint32_t clockt;
126 typedef uint8_t hasht[16];
127
128 // CLI actions
129 struct cli_session_actions {
130 char action;
131 in_addr_t snoop_ip;
132 uint16_t snoop_port;
133 int throttle_in;
134 int throttle_out;
135 int filter_in;
136 int filter_out;
137 };
138
139 #define CLI_SESS_KILL 0x01
140 #define CLI_SESS_SNOOP 0x02
141 #define CLI_SESS_NOSNOOP 0x04
142 #define CLI_SESS_THROTTLE 0x08
143 #define CLI_SESS_NOTHROTTLE 0x10
144 #define CLI_SESS_FILTER 0x20
145 #define CLI_SESS_NOFILTER 0x40
146
147 struct cli_tunnel_actions {
148 char action;
149 };
150
151 #define CLI_TUN_KILL 0x01
152
153 // dump header: update number if internal format changes
154 #define DUMP_MAGIC "L2TPNS#" VERSION "#"
155
156 // structures
157 typedef struct // route
158 {
159 in_addr_t ip;
160 in_addr_t mask;
161 }
162 routet;
163
164 typedef struct controls // control message
165 {
166 struct controls *next; // next in queue
167 uint16_t length; // length
168 uint8_t buf[MAXCONTROL];
169 }
170 controlt;
171
172 typedef struct
173 {
174 sessionidt next; // next session in linked list
175 sessionidt far; // far end session ID
176 tunnelidt tunnel; // near end tunnel ID
177 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
178 int ip_pool_index; // index to IP pool
179 unsigned long unique_id; // unique session id
180 uint16_t nr; // next receive
181 uint16_t ns; // next send
182 uint32_t magic; // ppp magic number
183 uint32_t cin, cout; // byte counts
184 uint32_t pin, pout; // packet counts
185 uint32_t total_cin; // This counter is never reset while a session is open
186 uint32_t total_cout; // This counter is never reset while a session is open
187 uint32_t id; // session id
188 uint16_t throttle_in; // upstream throttle rate (kbps)
189 uint16_t throttle_out; // downstream throttle rate
190 clockt opened; // when started
191 clockt die; // being closed, when to finally free
192 time_t last_packet; // Last packet from the user (used for idle timeouts)
193 in_addr_t dns1, dns2; // DNS servers
194 routet route[MAXROUTE]; // static routes
195 uint16_t radius; // which radius session is being used (0 for not waiting on authentication)
196 uint16_t mru; // maximum receive unit
197 uint16_t tbf_in; // filter bucket for throttling in from the user.
198 uint16_t tbf_out; // filter bucket for throttling out to the user.
199 uint8_t l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel.
200 uint8_t reserved_old_snoop; // No longer used - remove at some time
201 uint8_t walled_garden; // is this session gardened?
202 uint8_t flags1; // additional flags (currently unused);
203 char random_vector[MAXTEL];
204 int random_vector_length;
205 char user[129]; // user (needed in seesion for radius stop messages) (can we reduce this? --mo)
206 char called[MAXTEL]; // called number
207 char calling[MAXTEL]; // calling number
208 uint32_t tx_connect_speed;
209 uint32_t rx_connect_speed;
210 uint32_t flags; // Various session flags.
211 in_addr_t snoop_ip; // Interception destination IP
212 uint16_t snoop_port; // Interception destination port
213 uint16_t sid; // near end session id.
214 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
215 uint8_t filter_out; // output filter index
216 char reserved[18]; // Space to expand structure without changing HB_VERSION
217 }
218 sessiont;
219
220 #define SF_IPCP_ACKED 1 // Has this session seen an IPCP Ack?
221 #define SF_LCP_ACKED 2 // LCP negotiated
222 #define SF_CCP_ACKED 4 // CCP negotiated
223 #define SF_IPV6CP_ACKED 8 // IPv6 negotiated
224 #define SF_IPV6_NACKED 16 // IPv6 rejected
225
226 #define AUTHPAP 1 // allow PAP
227 #define AUTHCHAP 2 // allow CHAP
228
229 typedef struct
230 {
231 uint32_t cin;
232 uint32_t cout;
233 } sessioncountt;
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 RADIUSWAIT, // waiting timeout before available, in case delayed replies
322 RADIUSDEAD, // errored while talking to radius server.
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
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_processudp;
374 uint32_t call_sessionbyip;
375 uint32_t call_sessionbyuser;
376 uint32_t call_sendarp;
377 uint32_t call_sendipcp;
378 uint32_t call_tunnelsend;
379 uint32_t call_sessionkill;
380 uint32_t call_sessionshutdown;
381 uint32_t call_tunnelkill;
382 uint32_t call_tunnelshutdown;
383 uint32_t call_assign_ip_address;
384 uint32_t call_free_ip_address;
385 uint32_t call_dump_acct_info;
386 uint32_t call_sessionsetup;
387 uint32_t call_processpap;
388 uint32_t call_processchap;
389 uint32_t call_processlcp;
390 uint32_t call_processipcp;
391 uint32_t call_processipin;
392 uint32_t call_processccp;
393 uint32_t call_sendchap;
394 uint32_t call_processrad;
395 uint32_t call_radiussend;
396 uint32_t call_radiusretry;
397 uint32_t call_random_data;
398 #endif
399 };
400
401 #ifdef STATISTICS
402
403 #ifdef STAT_CALLS
404 #define CSTAT(x) STAT(call_ ## x)
405 #else
406 #define CSTAT(x)
407 #endif
408
409 #define STAT(x) (_statistics->x++)
410 #define INC_STAT(x,y) (_statistics->x += (y))
411 #define GET_STAT(x) (_statistics->x)
412 #define SET_STAT(x, y) (_statistics->x = (y))
413 #else
414 #define CSTAT(x)
415 #define STAT(x)
416 #define INC_STAT(x,y)
417 #define GET_STAT(x) 0
418 #define SET_STAT(x, y)
419 #endif
420
421 typedef struct
422 {
423 int debug; // debugging level
424 time_t start_time; // time when l2tpns was started
425 char bandwidth[256]; // current bandwidth
426 char pid_file[256]; // file to write PID to on startup
427 int wrote_pid;
428 clockt current_time; // 1/10ths of a second since the process started.
429 // means that we can only run a given process
430 // for 13 years without re-starting!
431
432 char config_file[128];
433 int reload_config; // flag to re-read config (set by cli)
434 int cleanup_interval; // interval between regular cleanups (in seconds)
435 int multi_read_count; // amount of packets to read per fd in processing loop
436
437 char tundevice[10]; // tun device name
438 char log_filename[128];
439 char l2tpsecret[64];
440
441 char random_device[256]; // random device path, defaults to RANDOMDEVICE
442
443 char radiussecret[64];
444 int radius_accounting;
445 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
446 uint16_t radiusport[MAXRADSERVER]; // radius base ports
447 uint8_t numradiusservers; // radius server count
448 short num_radfds; // Number of radius filehandles allocated
449
450 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
451 int radius_authtypes;
452 int radius_authprefer;
453
454 in_addr_t default_dns1, default_dns2;
455
456 unsigned long rl_rate; // default throttle rate
457 int num_tbfs; // number of throttle buckets
458
459 int save_state;
460 char accounting_dir[128];
461 in_addr_t bind_address;
462 in_addr_t peer_address;
463 int send_garp; // Set to true to garp for vip address on startup
464
465 int target_uid;
466 int dump_speed;
467 char plugins[64][MAXPLUGINS];
468 char old_plugins[64][MAXPLUGINS];
469
470 int next_tbf; // Next HTB id available to use
471 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling policy for this process.
472 int lock_pages; // Lock pages into memory.
473 int icmp_rate; // Max number of ICMP unreachable per second to send>
474
475 in_addr_t cluster_address; // Multicast address of cluster.
476 // Send to this address to have everyone hear.
477 char cluster_interface[64]; // Which interface to listen for multicast on.
478 int cluster_iam_master; // Are we the cluster master???
479 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
480 in_addr_t cluster_master_address; // The network address of the cluster master.
481 // Zero if i am the cluster master.
482 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
483 // (or the seq number we're next expecting if we're a slave).
484 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
485 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
486 int cluster_highest_sessionid;
487 int cluster_highest_tunnelid;
488 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
489 int cluster_num_changes; // Number of changes queued.
490
491 int cluster_hb_interval; // How often to send a heartbeat.
492 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
493 uint64_t cluster_table_version; // # state changes processed by cluster
494
495 #ifdef BGP
496 #define BGP_NUM_PEERS 2
497 uint16_t as_number;
498 struct {
499 char name[64];
500 uint16_t as;
501 int keepalive;
502 int hold;
503 } neighbour[BGP_NUM_PEERS];
504 #endif
505 } configt;
506
507 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
508 typedef struct
509 {
510 char *key;
511 int offset;
512 int size;
513 enum config_typet type;
514 } config_descriptt;
515
516 typedef struct
517 {
518 uint8_t op; // operation
519 #define FILTER_PORT_OP_NONE 0 // all ports match
520 #define FILTER_PORT_OP_EQ 1
521 #define FILTER_PORT_OP_NEQ 2
522 #define FILTER_PORT_OP_GT 3
523 #define FILTER_PORT_OP_LT 4
524 #define FILTER_PORT_OP_RANGE 5
525 uint16_t port; // port (host byte order)
526 uint16_t port2; // range
527 } ip_filter_portt;
528
529 typedef struct
530 {
531 int action; // permit/deny
532 #define FILTER_ACTION_DENY 1
533 #define FILTER_ACTION_PERMIT 2
534 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
535 in_addr_t src_ip; // source ip (network byte order)
536 in_addr_t src_wild;
537 ip_filter_portt src_ports;
538 in_addr_t dst_ip; // dest ip
539 in_addr_t dst_wild;
540 ip_filter_portt dst_ports;
541 uint8_t frag; // apply to non-initial fragments
542 uint8_t tcp_flag_op; // match type: any, all, established
543 #define FILTER_FLAG_OP_ANY 1
544 #define FILTER_FLAG_OP_ALL 2
545 #define FILTER_FLAG_OP_EST 3
546 uint8_t tcp_sflags; // flags set
547 uint8_t tcp_cflags; // flags clear
548 uint32_t counter; // match count
549 } ip_filter_rulet;
550
551 #define TCP_FLAG_FIN 0x01
552 #define TCP_FLAG_SYN 0x02
553 #define TCP_FLAG_RST 0x04
554 #define TCP_FLAG_PSH 0x08
555 #define TCP_FLAG_ACK 0x10
556 #define TCP_FLAG_URG 0x20
557
558 #define MAXFILTER 32
559 #define MAXFILTER_RULES 32
560 typedef struct
561 {
562 char name[32]; // ACL name
563 int extended; // type: 0 = standard, 1 = extended
564 ip_filter_rulet rules[MAXFILTER_RULES];
565 int used; // session ref count
566 } ip_filtert;
567
568 // arp.c
569 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
570
571
572 // ppp.c
573 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
574 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
575 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
576 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
577 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
578 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
579 void sendchap(tunnelidt t, sessionidt s);
580 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
581 void initlcp(tunnelidt t, sessionidt s);
582 void send_ipin(sessionidt s, uint8_t *buf, int len);
583
584
585 // radius.c
586 void initrad(void);
587 void radiussend(uint16_t r, uint8_t state);
588 void processrad(uint8_t *buf, int len, char socket_index);
589 void radiusretry(uint16_t r);
590 uint16_t radiusnew(sessionidt s);
591 void radiusclear(uint16_t r, sessionidt s);
592
593
594 // l2tpns.c
595 clockt backoff(uint8_t try);
596 sessionidt sessionbyip(in_addr_t ip);
597 sessionidt sessionbyuser(char *username);
598 void random_data(uint8_t *buf, int len);
599 void sessionshutdown(sessionidt s, char *reason);
600 void send_garp(in_addr_t ip);
601 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
602 void sendipcp(tunnelidt t, sessionidt s);
603 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
604 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
605 int ip_filter(uint8_t *buf, int len, uint8_t filter);
606 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
607 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
608 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
609
610 #undef LOG
611 #undef LOG_HEX
612 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
613 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
614
615 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
616 void _log_hex(int level, const char *title, const char *data, int maxsize);
617
618 int sessionsetup(tunnelidt t, sessionidt s);
619 int run_plugins(int plugin_type, void *data);
620 void rebuild_address_pool(void);
621 void throttle_session(sessionidt s, int rate_in, int rate_out);
622 int load_session(sessionidt, sessiont *);
623 void become_master(void); // We're the master; kick off any required master initializations.
624
625
626 // cli.c
627 void init_cli(char *hostname);
628 void cli_do_file(FILE *fh);
629 void cli_do(int sockfd);
630 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
631
632
633 // icmp.c
634 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
635
636
637 extern tunnelt *tunnel;
638 extern sessiont *session;
639 extern sessioncountt *sess_count;
640 extern ippoolt *ip_address_pool;
641 #define sessionfree (session[0].next)
642
643 #define log_backtrace(count, max) \
644 if (count++ < max) { \
645 void *array[20]; \
646 char **strings; \
647 int size, i; \
648 LOG(0, 0, t, "Backtrace follows"); \
649 size = backtrace(array, 10); \
650 strings = backtrace_symbols(array, size); \
651 if (strings) for (i = 0; i < size; i++) \
652 { \
653 LOG(0, 0, t, "%s\n", strings[i]); \
654 } \
655 free(strings); \
656 }
657
658
659 extern configt *config;
660 extern time_t basetime; // Time when this process started.
661 extern time_t time_now; // Seconds since EPOCH.
662 extern uint32_t last_id;
663 extern struct Tstats *_statistics;
664 extern in_addr_t my_address;
665 extern int tun_write(uint8_t *data, int size);
666 extern int clifd;
667
668
669 #define TIME (config->current_time)
670
671 // macros for handling help in cli commands
672 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
673 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
674
675 // CVS identifiers (for "show version file")
676 extern char const *cvs_id_arp;
677 extern char const *cvs_id_cli;
678 extern char const *cvs_id_cluster;
679 extern char const *cvs_id_constants;
680 extern char const *cvs_id_control;
681 extern char const *cvs_id_icmp;
682 extern char const *cvs_id_l2tpns;
683 extern char const *cvs_id_ll;
684 extern char const *cvs_id_md5;
685 extern char const *cvs_id_ppp;
686 extern char const *cvs_id_radius;
687 extern char const *cvs_id_tbf;
688 extern char const *cvs_id_util;
689
690 #endif /* __L2TPNS_H__ */