724a959d7453dc4a0566b25402dda1f514ca3e68
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.75 2005/06/02 11:32:31 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 6
26 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
27 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
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 #define DEFAULT_MRU 1452 // maximum packet size to avoid fragmentation when LNS ethernet MTU is 1500
47
48 // Constants
49 #ifndef ETCDIR
50 #define ETCDIR "/etc/l2tpns"
51 #endif
52
53 #ifndef LIBDIR
54 #define LIBDIR "/usr/lib/l2tpns"
55 #endif
56
57 #ifndef PLUGINDIR
58 #define PLUGINDIR LIBDIR // Plugins
59 #endif
60
61 #ifndef PLUGINCONF
62 #define PLUGINCONF ETCDIR // Plugin config dir
63 #endif
64
65 #ifndef FLASHDIR
66 #define FLASHDIR ETCDIR
67 #endif
68
69 #define TUNDEVICE "/dev/net/tun"
70 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
71 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
72 #define CLIUSERS FLASHDIR "/users" // CLI Users file
73 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
74 #define ACCT_TIME 3000 // 5 minute accounting interval
75 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
76 #define L2TPPORT 1701 // L2TP port
77 #define RADPORT 1645 // old radius port...
78 #define PKTARP 0x0806 // ARP packet type
79 #define PKTIP 0x0800 // IPv4 packet type
80 #define PKTIPV6 0x86DD // IPv6 packet type
81 #define PPPPAP 0xC023
82 #define PPPCHAP 0xC223
83 #define PPPLCP 0xC021
84 #define PPPIPCP 0x8021
85 #define PPPIPV6CP 0x8057
86 #define PPPCCP 0x80FD
87 #define PPPIP 0x0021
88 #define PPPIPV6 0x0057
89 #define PPPMP 0x003D
90 #define MIN_IP_SIZE 0x19
91
92 enum {
93 ConfigReq = 1,
94 ConfigAck,
95 ConfigNak,
96 ConfigRej,
97 TerminateReq,
98 TerminateAck,
99 CodeRej,
100 ProtocolRej,
101 EchoReq,
102 EchoReply,
103 DiscardRequest,
104 IdentRequest
105 };
106
107 enum {
108 AccessRequest = 1,
109 AccessAccept,
110 AccessReject,
111 AccountingRequest,
112 AccountingResponse,
113 AccessChallenge = 11
114 };
115
116 // Types
117 typedef uint16_t sessionidt;
118 typedef uint16_t tunnelidt;
119 typedef uint32_t clockt;
120 typedef uint8_t hasht[16];
121
122 // CLI actions
123 struct cli_session_actions {
124 char action;
125 in_addr_t snoop_ip;
126 uint16_t snoop_port;
127 int throttle_in;
128 int throttle_out;
129 int filter_in;
130 int filter_out;
131 };
132
133 #define CLI_SESS_KILL 0x01
134 #define CLI_SESS_SNOOP 0x02
135 #define CLI_SESS_NOSNOOP 0x04
136 #define CLI_SESS_THROTTLE 0x08
137 #define CLI_SESS_NOTHROTTLE 0x10
138 #define CLI_SESS_FILTER 0x20
139 #define CLI_SESS_NOFILTER 0x40
140
141 struct cli_tunnel_actions {
142 char action;
143 };
144
145 #define CLI_TUN_KILL 0x01
146
147 // structures
148 typedef struct // route
149 {
150 in_addr_t ip;
151 in_addr_t mask;
152 }
153 routet;
154
155 typedef struct controls // control message
156 {
157 struct controls *next; // next in queue
158 uint16_t length; // length
159 uint8_t buf[MAXCONTROL];
160 }
161 controlt;
162
163 typedef struct
164 {
165 sessionidt next; // next session in linked list
166 sessionidt far; // far end session ID
167 tunnelidt tunnel; // near end tunnel ID
168 uint8_t l2tp_flags; // various bit flags from the ICCN on the l2tp tunnel.
169 uint8_t flags; // Various session flags.
170 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
171 int ip_pool_index; // index to IP pool
172 uint32_t unique_id; // unique session id
173 uint16_t nr; // next receive
174 uint16_t ns; // next send
175 uint32_t magic; // ppp magic number
176 uint32_t pin, pout; // packet counts
177 uint32_t cin, cout; // byte counts
178 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
179 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
180 uint16_t throttle_in; // upstream throttle rate (kbps)
181 uint16_t throttle_out; // downstream throttle rate
182 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
183 uint8_t filter_out; // output filter index
184 uint16_t mru; // maximum receive unit
185 clockt opened; // when started
186 clockt die; // being closed, when to finally free
187 time_t last_packet; // Last packet from the user (used for idle timeouts)
188 in_addr_t dns1, dns2; // DNS servers
189 routet route[MAXROUTE]; // static routes
190 uint16_t tbf_in; // filter bucket for throttling in from the user.
191 uint16_t tbf_out; // filter bucket for throttling out to the user.
192 int random_vector_length;
193 char random_vector[MAXTEL];
194 char user[MAXUSER]; // user (needed in seesion for radius stop messages)
195 char called[MAXTEL]; // called number
196 char calling[MAXTEL]; // calling number
197 uint32_t tx_connect_speed;
198 uint32_t rx_connect_speed;
199 in_addr_t snoop_ip; // Interception destination IP
200 uint16_t snoop_port; // Interception destination port
201 uint8_t walled_garden; // is this session gardened?
202 uint8_t ipv6prefixlen; // IPv6 route prefix length
203 struct in6_addr ipv6route; // Static IPv6 route
204 char reserved[16]; // Space to expand structure without changing HB_VERSION
205 }
206 sessiont;
207
208 #define SF_IPCP_ACKED 1 // Has this session seen an IPCP Ack?
209 #define SF_LCP_ACKED 2 // LCP negotiated
210 #define SF_CCP_ACKED 4 // CCP negotiated
211 #define SF_IPV6CP_ACKED 8 // IPv6 negotiated
212 #define SF_IPV6_NACKED 16 // IPv6 rejected
213 #define SF_IPV6_ROUTED 32 // advertised v6 route
214
215 #define AUTHPAP 1 // allow PAP
216 #define AUTHCHAP 2 // allow CHAP
217
218 typedef struct
219 {
220 // packet counters
221 uint32_t pin;
222 uint32_t pout;
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
233 // RADIUS session in use
234 uint16_t radius;
235
236 // interim RADIUS
237 time_t last_interim;
238 } sessionlocalt;
239
240 #define SESSIONPFC 1 // PFC negotiated flags
241 #define SESSIONACFC 2 // ACFC negotiated flags
242
243 // 168 bytes per tunnel
244 typedef struct
245 {
246 tunnelidt far; // far end tunnel ID
247 in_addr_t ip; // Ip for far end
248 uint16_t port; // port for far end
249 uint16_t window; // Rx window
250 uint16_t nr; // next receive
251 uint16_t ns; // next send
252 int state; // current state (tunnelstate enum)
253 clockt last; // when last control message sent (used for resend timeout)
254 clockt retry; // when to try resenting pending control
255 clockt die; // being closed, when to finally free
256 clockt lastrec; // when the last control message was received
257 char hostname[128]; // tunnel hostname
258 char vendor[128]; // LAC vendor
259 uint8_t try; // number of retrys on a control message
260 uint16_t controlc; // outstaind messages in queue
261 controlt *controls; // oldest message
262 controlt *controle; // newest message
263 }
264 tunnelt;
265
266 // 180 bytes per radius session
267 typedef struct // outstanding RADIUS requests
268 {
269 sessionidt session; // which session this applies to
270 hasht auth; // request authenticator
271 clockt retry; // when to try next
272 char calling[MAXTEL]; // calling number
273 char pass[129]; // password
274 uint8_t id; // ID for PPP response
275 uint8_t try; // which try we are on
276 uint8_t state; // state of radius requests
277 uint8_t chap; // set if CHAP used (is CHAP identifier)
278 }
279 radiust;
280
281 typedef struct
282 {
283 in_addr_t address; // Host byte order..
284 char assigned; // 1 if assigned, 0 if free
285 sessionidt session;
286 clockt last; // last used
287 char user[129]; // user (try to have ip addresses persistent)
288 }
289 ippoolt;
290
291 #ifdef RINGBUFFER
292 struct Tringbuffer
293 {
294 struct {
295 char level;
296 sessionidt session;
297 tunnelidt tunnel;
298 char message[MAX_LOG_LENGTH];
299 } buffer[RINGBUFFER_SIZE];
300 int head;
301 int tail;
302 };
303 #endif
304
305 /*
306 * Possible tunnel states
307 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
308 */
309 enum
310 {
311 TUNNELFREE, // Not in use
312 TUNNELOPEN, // Active tunnel
313 TUNNELDIE, // Currently closing
314 TUNNELOPENING, // Busy opening
315 TUNNELUNDEF, // Undefined
316 };
317
318 enum
319 {
320 RADIUSNULL, // Not in use
321 RADIUSCHAP, // sending CHAP down PPP
322 RADIUSAUTH, // sending auth to RADIUS server
323 RADIUSIPCP, // sending IPCP to end user
324 RADIUSSTART, // sending start accounting to RADIUS server
325 RADIUSSTOP, // sending stop accounting to RADIUS server
326 RADIUSINTERIM, // sending interim accounting to RADIUS server
327 RADIUSWAIT, // waiting timeout before available, in case delayed replies
328 };
329
330 struct Tstats
331 {
332 time_t start_time;
333 time_t last_reset;
334
335 uint32_t tun_rx_packets;
336 uint32_t tun_tx_packets;
337 uint32_t tun_rx_bytes;
338 uint32_t tun_tx_bytes;
339 uint32_t tun_rx_errors;
340 uint32_t tun_tx_errors;
341 uint32_t tun_rx_dropped;
342
343 uint32_t tunnel_rx_packets;
344 uint32_t tunnel_tx_packets;
345 uint32_t tunnel_rx_bytes;
346 uint32_t tunnel_tx_bytes;
347 uint32_t tunnel_rx_errors;
348 uint32_t tunnel_tx_errors;
349
350 uint32_t tunnel_retries;
351 uint32_t radius_retries;
352
353 uint32_t arp_sent;
354
355 uint32_t packets_snooped;
356
357 uint32_t tunnel_created;
358 uint32_t session_created;
359 uint32_t tunnel_timeout;
360 uint32_t session_timeout;
361 uint32_t radius_timeout;
362 uint32_t radius_overflow;
363 uint32_t tunnel_overflow;
364 uint32_t session_overflow;
365
366 uint32_t ip_allocated;
367 uint32_t ip_freed;
368
369 uint32_t c_forwarded;
370 uint32_t recv_forward;
371
372 uint32_t select_called;
373 uint32_t multi_read_used;
374 uint32_t multi_read_exceeded;
375
376 #ifdef STATISTICS
377 uint32_t call_processtun;
378 uint32_t call_processipout;
379 uint32_t call_processipv6out;
380 uint32_t call_processudp;
381 uint32_t call_sessionbyip;
382 uint32_t call_sessionbyipv6;
383 uint32_t call_sessionbyuser;
384 uint32_t call_sendarp;
385 uint32_t call_sendipcp;
386 uint32_t call_processipv6cp;
387 uint32_t call_tunnelsend;
388 uint32_t call_sessionkill;
389 uint32_t call_sessionshutdown;
390 uint32_t call_tunnelkill;
391 uint32_t call_tunnelshutdown;
392 uint32_t call_assign_ip_address;
393 uint32_t call_free_ip_address;
394 uint32_t call_dump_acct_info;
395 uint32_t call_sessionsetup;
396 uint32_t call_processpap;
397 uint32_t call_processchap;
398 uint32_t call_processlcp;
399 uint32_t call_processipcp;
400 uint32_t call_processipin;
401 uint32_t call_processipv6in;
402 uint32_t call_processccp;
403 uint32_t call_sendchap;
404 uint32_t call_processrad;
405 uint32_t call_radiussend;
406 uint32_t call_radiusretry;
407 uint32_t call_random_data;
408 #endif
409 };
410
411 #ifdef STATISTICS
412
413 #ifdef STAT_CALLS
414 #define CSTAT(x) STAT(call_ ## x)
415 #else
416 #define CSTAT(x)
417 #endif
418
419 #define STAT(x) (_statistics->x++)
420 #define INC_STAT(x,y) (_statistics->x += (y))
421 #define GET_STAT(x) (_statistics->x)
422 #define SET_STAT(x, y) (_statistics->x = (y))
423 #else
424 #define CSTAT(x)
425 #define STAT(x)
426 #define INC_STAT(x,y)
427 #define GET_STAT(x) 0
428 #define SET_STAT(x, y)
429 #endif
430
431 typedef struct
432 {
433 int debug; // debugging level
434 time_t start_time; // time when l2tpns was started
435 char bandwidth[256]; // current bandwidth
436 char pid_file[256]; // file to write PID to on startup
437 int wrote_pid;
438 clockt current_time; // 1/10ths of a second since the process started.
439 // means that we can only run a given process
440 // for 13 years without re-starting!
441
442 char config_file[128];
443 int reload_config; // flag to re-read config (set by cli)
444 int multi_read_count; // amount of packets to read per fd in processing loop
445
446 char tundevice[10]; // tun device name
447 char log_filename[128];
448 char l2tpsecret[64];
449
450 char random_device[256]; // random device path, defaults to RANDOMDEVICE
451
452 char radiussecret[64];
453 int radius_accounting;
454 int radius_interim;
455 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
456 uint16_t radiusport[MAXRADSERVER]; // radius base ports
457 uint8_t numradiusservers; // radius server count
458 short num_radfds; // Number of radius filehandles allocated
459
460 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
461 int radius_authtypes;
462 int radius_authprefer;
463
464 int allow_duplicate_users; // allow multiple logins with the same username
465
466 in_addr_t default_dns1, default_dns2;
467
468 unsigned long rl_rate; // default throttle rate
469 int num_tbfs; // number of throttle buckets
470
471 char accounting_dir[128];
472 in_addr_t bind_address;
473 in_addr_t peer_address;
474 int send_garp; // Set to true to garp for vip address on startup
475
476 int target_uid;
477 int dump_speed;
478 char plugins[64][MAXPLUGINS];
479 char old_plugins[64][MAXPLUGINS];
480
481 int next_tbf; // Next HTB id available to use
482 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
483 // policy for this process.
484 int lock_pages; // Lock pages into memory.
485 int icmp_rate; // Max number of ICMP unreachable per second to send
486 int max_packets; // DoS prevention: per session limit of packets/0.1s
487
488 in_addr_t cluster_address; // Multicast address of cluster.
489 // Send to this address to have everyone hear.
490 char cluster_interface[64]; // Which interface to listen for multicast on.
491 int cluster_iam_master; // Are we the cluster master???
492 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
493 in_addr_t cluster_master_address; // The network address of the cluster master.
494 // Zero if i am the cluster master.
495 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
496 // (or the seq number we're next expecting if we're a slave).
497 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
498 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
499 int cluster_highest_sessionid;
500 int cluster_highest_tunnelid;
501 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
502 int cluster_last_hb_ver; // Heartbeat version last seen from master
503 int cluster_num_changes; // Number of changes queued.
504
505 int cluster_hb_interval; // How often to send a heartbeat.
506 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
507 uint64_t cluster_table_version; // # state changes processed by cluster
508
509 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
510
511
512 int cluster_master_min_adv; // Master advertises routes while the number of up to date
513 // slaves is less than this value.
514
515 #ifdef BGP
516 #define BGP_NUM_PEERS 2
517 uint16_t as_number;
518 struct {
519 char name[64];
520 uint16_t as;
521 int keepalive;
522 int hold;
523 } neighbour[BGP_NUM_PEERS];
524 #endif
525 } configt;
526
527 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
528 typedef struct
529 {
530 char *key;
531 int offset;
532 int size;
533 enum config_typet type;
534 } config_descriptt;
535
536 typedef struct
537 {
538 uint8_t op; // operation
539 #define FILTER_PORT_OP_NONE 0 // all ports match
540 #define FILTER_PORT_OP_EQ 1
541 #define FILTER_PORT_OP_NEQ 2
542 #define FILTER_PORT_OP_GT 3
543 #define FILTER_PORT_OP_LT 4
544 #define FILTER_PORT_OP_RANGE 5
545 uint16_t port; // port (host byte order)
546 uint16_t port2; // range
547 } ip_filter_portt;
548
549 typedef struct
550 {
551 int action; // permit/deny
552 #define FILTER_ACTION_DENY 1
553 #define FILTER_ACTION_PERMIT 2
554 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
555 in_addr_t src_ip; // source ip (network byte order)
556 in_addr_t src_wild;
557 ip_filter_portt src_ports;
558 in_addr_t dst_ip; // dest ip
559 in_addr_t dst_wild;
560 ip_filter_portt dst_ports;
561 uint8_t frag; // apply to non-initial fragments
562 uint8_t tcp_flag_op; // match type: any, all, established
563 #define FILTER_FLAG_OP_ANY 1
564 #define FILTER_FLAG_OP_ALL 2
565 #define FILTER_FLAG_OP_EST 3
566 uint8_t tcp_sflags; // flags set
567 uint8_t tcp_cflags; // flags clear
568 uint32_t counter; // match count
569 } ip_filter_rulet;
570
571 #define TCP_FLAG_FIN 0x01
572 #define TCP_FLAG_SYN 0x02
573 #define TCP_FLAG_RST 0x04
574 #define TCP_FLAG_PSH 0x08
575 #define TCP_FLAG_ACK 0x10
576 #define TCP_FLAG_URG 0x20
577
578 #define MAXFILTER 32
579 #define MAXFILTER_RULES 32
580 typedef struct
581 {
582 char name[32]; // ACL name
583 int extended; // type: 0 = standard, 1 = extended
584 ip_filter_rulet rules[MAXFILTER_RULES];
585 int used; // session ref count
586 } ip_filtert;
587
588 // arp.c
589 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
590
591
592 // ppp.c
593 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
594 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
595 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
596 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
597 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
598 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
599 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
600 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
601 void sendchap(tunnelidt t, sessionidt s);
602 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
603 void sendlcp(tunnelidt t, sessionidt s, int authtype);
604 void send_ipin(sessionidt s, uint8_t *buf, int len);
605
606
607 // radius.c
608 void initrad(void);
609 void radiussend(uint16_t r, uint8_t state);
610 void processrad(uint8_t *buf, int len, char socket_index);
611 void radiusretry(uint16_t r);
612 uint16_t radiusnew(sessionidt s);
613 void radiusclear(uint16_t r, sessionidt s);
614
615
616 // l2tpns.c
617 clockt backoff(uint8_t try);
618 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
619 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
620 sessionidt sessionbyip(in_addr_t ip);
621 sessionidt sessionbyipv6(struct in6_addr ip);
622 sessionidt sessionbyuser(char *username);
623 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
624 void random_data(uint8_t *buf, int len);
625 void sessionkill(sessionidt s, char *reason);
626 void sessionshutdown(sessionidt s, char *reason, int result, int error);
627 void send_garp(in_addr_t ip);
628 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
629 void sendipcp(tunnelidt t, sessionidt s);
630 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
631 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
632 int ip_filter(uint8_t *buf, int len, uint8_t filter);
633 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
634 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
635 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
636
637 #undef LOG
638 #undef LOG_HEX
639 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
640 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
641
642 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
643 void _log_hex(int level, const char *title, const char *data, int maxsize);
644
645 int sessionsetup(tunnelidt t, sessionidt s);
646 int run_plugins(int plugin_type, void *data);
647 void rebuild_address_pool(void);
648 void throttle_session(sessionidt s, int rate_in, int rate_out);
649 int load_session(sessionidt, sessiont *);
650 void become_master(void); // We're the master; kick off any required master initializations.
651
652
653 // cli.c
654 void init_cli(char *hostname);
655 void cli_do_file(FILE *fh);
656 void cli_do(int sockfd);
657 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
658
659
660 // icmp.c
661 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
662
663
664 extern tunnelt *tunnel;
665 extern sessiont *session;
666 extern sessionlocalt *sess_local;
667 extern ippoolt *ip_address_pool;
668 #define sessionfree (session[0].next)
669
670 #define log_backtrace(count, max) \
671 if (count++ < max) { \
672 void *array[20]; \
673 char **strings; \
674 int size, i; \
675 LOG(0, 0, t, "Backtrace follows"); \
676 size = backtrace(array, 10); \
677 strings = backtrace_symbols(array, size); \
678 if (strings) for (i = 0; i < size; i++) \
679 { \
680 LOG(0, 0, t, "%s\n", strings[i]); \
681 } \
682 free(strings); \
683 }
684
685
686 extern configt *config;
687 extern time_t basetime; // Time when this process started.
688 extern time_t time_now; // Seconds since EPOCH.
689 extern char main_quit;
690 extern uint32_t last_id;
691 extern struct Tstats *_statistics;
692 extern in_addr_t my_address;
693 extern int tun_write(uint8_t *data, int size);
694 extern int clifd;
695
696
697 #define TIME (config->current_time)
698
699 // macros for handling help in cli commands
700 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
701 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
702
703 // CVS identifiers (for "show version file")
704 extern char const *cvs_id_arp;
705 extern char const *cvs_id_cli;
706 extern char const *cvs_id_cluster;
707 extern char const *cvs_id_constants;
708 extern char const *cvs_id_control;
709 extern char const *cvs_id_icmp;
710 extern char const *cvs_id_l2tpns;
711 extern char const *cvs_id_ll;
712 extern char const *cvs_id_md5;
713 extern char const *cvs_id_ppp;
714 extern char const *cvs_id_radius;
715 extern char const *cvs_id_tbf;
716 extern char const *cvs_id_util;
717
718 #endif /* __L2TPNS_H__ */