056becbf76afb18224d2c282982d41771c8d07df
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.74 2005/06/02 04:04:07 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 cin, cout; // byte counts
177 uint32_t pin, pout; // packet counts
178 uint32_t total_cin; // This counter is never reset while a session is open
179 uint32_t total_cout; // This counter is never reset while a session is open
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[24]; // 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 // byte counters
221 uint32_t cin;
222 uint32_t cout;
223
224 // DoS prevention
225 clockt last_packet_out;
226 uint32_t packets_out;
227 uint32_t packets_dropped;
228
229 // RADIUS session in use
230 uint16_t radius;
231
232 // interim RADIUS
233 time_t last_interim;
234 } sessionlocalt;
235
236 #define SESSIONPFC 1 // PFC negotiated flags
237 #define SESSIONACFC 2 // ACFC negotiated flags
238
239 // 168 bytes per tunnel
240 typedef struct
241 {
242 tunnelidt far; // far end tunnel ID
243 in_addr_t ip; // Ip for far end
244 uint16_t port; // port for far end
245 uint16_t window; // Rx window
246 uint16_t nr; // next receive
247 uint16_t ns; // next send
248 int state; // current state (tunnelstate enum)
249 clockt last; // when last control message sent (used for resend timeout)
250 clockt retry; // when to try resenting pending control
251 clockt die; // being closed, when to finally free
252 clockt lastrec; // when the last control message was received
253 char hostname[128]; // tunnel hostname
254 char vendor[128]; // LAC vendor
255 uint8_t try; // number of retrys on a control message
256 uint16_t controlc; // outstaind messages in queue
257 controlt *controls; // oldest message
258 controlt *controle; // newest message
259 }
260 tunnelt;
261
262 // 180 bytes per radius session
263 typedef struct // outstanding RADIUS requests
264 {
265 sessionidt session; // which session this applies to
266 hasht auth; // request authenticator
267 clockt retry; // when to try next
268 char calling[MAXTEL]; // calling number
269 char pass[129]; // password
270 uint8_t id; // ID for PPP response
271 uint8_t try; // which try we are on
272 uint8_t state; // state of radius requests
273 uint8_t chap; // set if CHAP used (is CHAP identifier)
274 }
275 radiust;
276
277 typedef struct
278 {
279 in_addr_t address; // Host byte order..
280 char assigned; // 1 if assigned, 0 if free
281 sessionidt session;
282 clockt last; // last used
283 char user[129]; // user (try to have ip addresses persistent)
284 }
285 ippoolt;
286
287 #ifdef RINGBUFFER
288 struct Tringbuffer
289 {
290 struct {
291 char level;
292 sessionidt session;
293 tunnelidt tunnel;
294 char message[MAX_LOG_LENGTH];
295 } buffer[RINGBUFFER_SIZE];
296 int head;
297 int tail;
298 };
299 #endif
300
301 /*
302 * Possible tunnel states
303 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
304 */
305 enum
306 {
307 TUNNELFREE, // Not in use
308 TUNNELOPEN, // Active tunnel
309 TUNNELDIE, // Currently closing
310 TUNNELOPENING, // Busy opening
311 TUNNELUNDEF, // Undefined
312 };
313
314 enum
315 {
316 RADIUSNULL, // Not in use
317 RADIUSCHAP, // sending CHAP down PPP
318 RADIUSAUTH, // sending auth to RADIUS server
319 RADIUSIPCP, // sending IPCP to end user
320 RADIUSSTART, // sending start accounting to RADIUS server
321 RADIUSSTOP, // sending stop accounting to RADIUS server
322 RADIUSINTERIM, // sending interim accounting to RADIUS server
323 RADIUSWAIT, // waiting timeout before available, in case delayed replies
324 };
325
326 struct Tstats
327 {
328 time_t start_time;
329 time_t last_reset;
330
331 uint32_t tun_rx_packets;
332 uint32_t tun_tx_packets;
333 uint32_t tun_rx_bytes;
334 uint32_t tun_tx_bytes;
335 uint32_t tun_rx_errors;
336 uint32_t tun_tx_errors;
337 uint32_t tun_rx_dropped;
338
339 uint32_t tunnel_rx_packets;
340 uint32_t tunnel_tx_packets;
341 uint32_t tunnel_rx_bytes;
342 uint32_t tunnel_tx_bytes;
343 uint32_t tunnel_rx_errors;
344 uint32_t tunnel_tx_errors;
345
346 uint32_t tunnel_retries;
347 uint32_t radius_retries;
348
349 uint32_t arp_sent;
350
351 uint32_t packets_snooped;
352
353 uint32_t tunnel_created;
354 uint32_t session_created;
355 uint32_t tunnel_timeout;
356 uint32_t session_timeout;
357 uint32_t radius_timeout;
358 uint32_t radius_overflow;
359 uint32_t tunnel_overflow;
360 uint32_t session_overflow;
361
362 uint32_t ip_allocated;
363 uint32_t ip_freed;
364
365 uint32_t c_forwarded;
366 uint32_t recv_forward;
367
368 uint32_t select_called;
369 uint32_t multi_read_used;
370 uint32_t multi_read_exceeded;
371
372 #ifdef STATISTICS
373 uint32_t call_processtun;
374 uint32_t call_processipout;
375 uint32_t call_processipv6out;
376 uint32_t call_processudp;
377 uint32_t call_sessionbyip;
378 uint32_t call_sessionbyipv6;
379 uint32_t call_sessionbyuser;
380 uint32_t call_sendarp;
381 uint32_t call_sendipcp;
382 uint32_t call_processipv6cp;
383 uint32_t call_tunnelsend;
384 uint32_t call_sessionkill;
385 uint32_t call_sessionshutdown;
386 uint32_t call_tunnelkill;
387 uint32_t call_tunnelshutdown;
388 uint32_t call_assign_ip_address;
389 uint32_t call_free_ip_address;
390 uint32_t call_dump_acct_info;
391 uint32_t call_sessionsetup;
392 uint32_t call_processpap;
393 uint32_t call_processchap;
394 uint32_t call_processlcp;
395 uint32_t call_processipcp;
396 uint32_t call_processipin;
397 uint32_t call_processipv6in;
398 uint32_t call_processccp;
399 uint32_t call_sendchap;
400 uint32_t call_processrad;
401 uint32_t call_radiussend;
402 uint32_t call_radiusretry;
403 uint32_t call_random_data;
404 #endif
405 };
406
407 #ifdef STATISTICS
408
409 #ifdef STAT_CALLS
410 #define CSTAT(x) STAT(call_ ## x)
411 #else
412 #define CSTAT(x)
413 #endif
414
415 #define STAT(x) (_statistics->x++)
416 #define INC_STAT(x,y) (_statistics->x += (y))
417 #define GET_STAT(x) (_statistics->x)
418 #define SET_STAT(x, y) (_statistics->x = (y))
419 #else
420 #define CSTAT(x)
421 #define STAT(x)
422 #define INC_STAT(x,y)
423 #define GET_STAT(x) 0
424 #define SET_STAT(x, y)
425 #endif
426
427 typedef struct
428 {
429 int debug; // debugging level
430 time_t start_time; // time when l2tpns was started
431 char bandwidth[256]; // current bandwidth
432 char pid_file[256]; // file to write PID to on startup
433 int wrote_pid;
434 clockt current_time; // 1/10ths of a second since the process started.
435 // means that we can only run a given process
436 // for 13 years without re-starting!
437
438 char config_file[128];
439 int reload_config; // flag to re-read config (set by cli)
440 int cleanup_interval; // interval between regular cleanups (in seconds)
441 int multi_read_count; // amount of packets to read per fd in processing loop
442
443 char tundevice[10]; // tun device name
444 char log_filename[128];
445 char l2tpsecret[64];
446
447 char random_device[256]; // random device path, defaults to RANDOMDEVICE
448
449 char radiussecret[64];
450 int radius_accounting;
451 int radius_interim;
452 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
453 uint16_t radiusport[MAXRADSERVER]; // radius base ports
454 uint8_t numradiusservers; // radius server count
455 short num_radfds; // Number of radius filehandles allocated
456
457 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
458 int radius_authtypes;
459 int radius_authprefer;
460
461 int allow_duplicate_users; // allow multiple logins with the same username
462
463 in_addr_t default_dns1, default_dns2;
464
465 unsigned long rl_rate; // default throttle rate
466 int num_tbfs; // number of throttle buckets
467
468 char accounting_dir[128];
469 in_addr_t bind_address;
470 in_addr_t peer_address;
471 int send_garp; // Set to true to garp for vip address on startup
472
473 int target_uid;
474 int dump_speed;
475 char plugins[64][MAXPLUGINS];
476 char old_plugins[64][MAXPLUGINS];
477
478 int next_tbf; // Next HTB id available to use
479 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
480 // policy for this process.
481 int lock_pages; // Lock pages into memory.
482 int icmp_rate; // Max number of ICMP unreachable per second to send
483 int max_packets; // DoS prevention: per session limit of packets/0.1s
484
485 in_addr_t cluster_address; // Multicast address of cluster.
486 // Send to this address to have everyone hear.
487 char cluster_interface[64]; // Which interface to listen for multicast on.
488 int cluster_iam_master; // Are we the cluster master???
489 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
490 in_addr_t cluster_master_address; // The network address of the cluster master.
491 // Zero if i am the cluster master.
492 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
493 // (or the seq number we're next expecting if we're a slave).
494 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
495 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
496 int cluster_highest_sessionid;
497 int cluster_highest_tunnelid;
498 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
499 int cluster_num_changes; // Number of changes queued.
500
501 int cluster_hb_interval; // How often to send a heartbeat.
502 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
503 uint64_t cluster_table_version; // # state changes processed by cluster
504
505 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
506
507
508 int cluster_master_min_adv; // Master advertises routes while the number of up to date
509 // slaves is less than this value.
510
511 #ifdef BGP
512 #define BGP_NUM_PEERS 2
513 uint16_t as_number;
514 struct {
515 char name[64];
516 uint16_t as;
517 int keepalive;
518 int hold;
519 } neighbour[BGP_NUM_PEERS];
520 #endif
521 } configt;
522
523 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
524 typedef struct
525 {
526 char *key;
527 int offset;
528 int size;
529 enum config_typet type;
530 } config_descriptt;
531
532 typedef struct
533 {
534 uint8_t op; // operation
535 #define FILTER_PORT_OP_NONE 0 // all ports match
536 #define FILTER_PORT_OP_EQ 1
537 #define FILTER_PORT_OP_NEQ 2
538 #define FILTER_PORT_OP_GT 3
539 #define FILTER_PORT_OP_LT 4
540 #define FILTER_PORT_OP_RANGE 5
541 uint16_t port; // port (host byte order)
542 uint16_t port2; // range
543 } ip_filter_portt;
544
545 typedef struct
546 {
547 int action; // permit/deny
548 #define FILTER_ACTION_DENY 1
549 #define FILTER_ACTION_PERMIT 2
550 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
551 in_addr_t src_ip; // source ip (network byte order)
552 in_addr_t src_wild;
553 ip_filter_portt src_ports;
554 in_addr_t dst_ip; // dest ip
555 in_addr_t dst_wild;
556 ip_filter_portt dst_ports;
557 uint8_t frag; // apply to non-initial fragments
558 uint8_t tcp_flag_op; // match type: any, all, established
559 #define FILTER_FLAG_OP_ANY 1
560 #define FILTER_FLAG_OP_ALL 2
561 #define FILTER_FLAG_OP_EST 3
562 uint8_t tcp_sflags; // flags set
563 uint8_t tcp_cflags; // flags clear
564 uint32_t counter; // match count
565 } ip_filter_rulet;
566
567 #define TCP_FLAG_FIN 0x01
568 #define TCP_FLAG_SYN 0x02
569 #define TCP_FLAG_RST 0x04
570 #define TCP_FLAG_PSH 0x08
571 #define TCP_FLAG_ACK 0x10
572 #define TCP_FLAG_URG 0x20
573
574 #define MAXFILTER 32
575 #define MAXFILTER_RULES 32
576 typedef struct
577 {
578 char name[32]; // ACL name
579 int extended; // type: 0 = standard, 1 = extended
580 ip_filter_rulet rules[MAXFILTER_RULES];
581 int used; // session ref count
582 } ip_filtert;
583
584 // arp.c
585 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
586
587
588 // ppp.c
589 void processpap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
590 void processchap(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
591 void processlcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
592 void processipcp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
593 void processipv6cp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
594 void processipin(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
595 void processipv6in(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
596 void processccp(tunnelidt t, sessionidt s, uint8_t *p, uint16_t l);
597 void sendchap(tunnelidt t, sessionidt s);
598 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, tunnelidt t, sessionidt s, uint16_t mtype);
599 void sendlcp(tunnelidt t, sessionidt s, int authtype);
600 void send_ipin(sessionidt s, uint8_t *buf, int len);
601
602
603 // radius.c
604 void initrad(void);
605 void radiussend(uint16_t r, uint8_t state);
606 void processrad(uint8_t *buf, int len, char socket_index);
607 void radiusretry(uint16_t r);
608 uint16_t radiusnew(sessionidt s);
609 void radiusclear(uint16_t r, sessionidt s);
610
611
612 // l2tpns.c
613 clockt backoff(uint8_t try);
614 void send_ipv6_ra(tunnelidt t, sessionidt s, struct in6_addr *ip);
615 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
616 sessionidt sessionbyip(in_addr_t ip);
617 sessionidt sessionbyipv6(struct in6_addr ip);
618 sessionidt sessionbyuser(char *username);
619 void random_data(uint8_t *buf, int len);
620 void sessionkill(sessionidt s, char *reason);
621 void sessionshutdown(sessionidt s, char *reason, int result, int error);
622 void send_garp(in_addr_t ip);
623 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
624 void sendipcp(tunnelidt t, sessionidt s);
625 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
626 void snoop_send_packet(char *packet, uint16_t size, in_addr_t destination, uint16_t port);
627 int ip_filter(uint8_t *buf, int len, uint8_t filter);
628 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
629 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
630 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
631
632 #undef LOG
633 #undef LOG_HEX
634 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
635 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
636
637 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
638 void _log_hex(int level, const char *title, const char *data, int maxsize);
639
640 int sessionsetup(tunnelidt t, sessionidt s);
641 int run_plugins(int plugin_type, void *data);
642 void rebuild_address_pool(void);
643 void throttle_session(sessionidt s, int rate_in, int rate_out);
644 int load_session(sessionidt, sessiont *);
645 void become_master(void); // We're the master; kick off any required master initializations.
646
647
648 // cli.c
649 void init_cli(char *hostname);
650 void cli_do_file(FILE *fh);
651 void cli_do(int sockfd);
652 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
653
654
655 // icmp.c
656 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, char *packet, int packet_len);
657
658
659 extern tunnelt *tunnel;
660 extern sessiont *session;
661 extern sessionlocalt *sess_local;
662 extern ippoolt *ip_address_pool;
663 #define sessionfree (session[0].next)
664
665 #define log_backtrace(count, max) \
666 if (count++ < max) { \
667 void *array[20]; \
668 char **strings; \
669 int size, i; \
670 LOG(0, 0, t, "Backtrace follows"); \
671 size = backtrace(array, 10); \
672 strings = backtrace_symbols(array, size); \
673 if (strings) for (i = 0; i < size; i++) \
674 { \
675 LOG(0, 0, t, "%s\n", strings[i]); \
676 } \
677 free(strings); \
678 }
679
680
681 extern configt *config;
682 extern time_t basetime; // Time when this process started.
683 extern time_t time_now; // Seconds since EPOCH.
684 extern uint32_t last_id;
685 extern struct Tstats *_statistics;
686 extern in_addr_t my_address;
687 extern int tun_write(uint8_t *data, int size);
688 extern int clifd;
689
690
691 #define TIME (config->current_time)
692
693 // macros for handling help in cli commands
694 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
695 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
696
697 // CVS identifiers (for "show version file")
698 extern char const *cvs_id_arp;
699 extern char const *cvs_id_cli;
700 extern char const *cvs_id_cluster;
701 extern char const *cvs_id_constants;
702 extern char const *cvs_id_control;
703 extern char const *cvs_id_icmp;
704 extern char const *cvs_id_l2tpns;
705 extern char const *cvs_id_ll;
706 extern char const *cvs_id_md5;
707 extern char const *cvs_id_ppp;
708 extern char const *cvs_id_radius;
709 extern char const *cvs_id_tbf;
710 extern char const *cvs_id_util;
711
712 #endif /* __L2TPNS_H__ */