17073c41f966255eea4f4c054a15ae10c6de106b
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.99 2005-11-17 07:35:35 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 "2.1.12"
19
20 // Limits
21 #define MAXTUNNEL 500 // could be up to 65535
22 #define MAXSESSION 60000 // could be up to 65535
23 #define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
24
25 #define RADIUS_SHIFT 6
26 #define RADIUS_FDS (1 << RADIUS_SHIFT)
27 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
28 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
29
30 #define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
31 #define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
32
33 #define MAXCONTROL 1000 // max length control message we ever send...
34 #define MINMTU 576 // minimum recommended MTU (rfc1063)
35 #define PPPMTU 1500 // default PPP MTU
36 #define MAXMTU 2600 // arbitrary maximum MTU
37 #define MAXETHER (MAXMTU+18) // max packet we try sending to tun
38 #define MAXTEL 96 // telephone number
39 #define MAXUSER 128 // username
40 #define MAXPASS 128 // password
41 #define MAXPLUGINS 20 // maximum number of plugins to load
42 #define MAXRADSERVER 10 // max radius servers
43 #define MAXROUTE 10 // max static routes per session
44 #define MAXIPPOOL 131072 // max number of ip addresses in pool
45 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
46 #define MAX_LOG_LENGTH 512 // Maximum size of log message
47 #define ECHO_TIMEOUT 60 // Time between last packet sent and LCP ECHO generation
48 #define IDLE_TIMEOUT 240 // Time between last packet sent and LCP ECHO generation
49 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
50
51 // Constants
52 #ifndef ETCDIR
53 #define ETCDIR "/etc/l2tpns"
54 #endif
55
56 #ifndef LIBDIR
57 #define LIBDIR "/usr/lib/l2tpns"
58 #endif
59
60 #ifndef PLUGINDIR
61 #define PLUGINDIR LIBDIR // Plugins
62 #endif
63
64 #ifndef PLUGINCONF
65 #define PLUGINCONF ETCDIR // Plugin config dir
66 #endif
67
68 #ifndef FLASHDIR
69 #define FLASHDIR ETCDIR
70 #endif
71
72 #define TUNDEVICE "/dev/net/tun"
73 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
74 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
75 #define CLIUSERS FLASHDIR "/users" // CLI Users file
76 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
77 #define ACCT_TIME 3000 // 5 minute accounting interval
78 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
79 #define L2TPPORT 1701 // L2TP port
80 #define RADPORT 1645 // old radius port...
81 #define DAEPORT 3799 // DAE port
82 #define PKTARP 0x0806 // ARP packet type
83 #define PKTIP 0x0800 // IPv4 packet type
84 #define PKTIPV6 0x86DD // IPv6 packet type
85 #define PPPPAP 0xC023
86 #define PPPCHAP 0xC223
87 #define PPPLCP 0xC021
88 #define PPPIPCP 0x8021
89 #define PPPIPV6CP 0x8057
90 #define PPPCCP 0x80FD
91 #define PPPIP 0x0021
92 #define PPPIPV6 0x0057
93 #define PPPMP 0x003D
94 #define MIN_IP_SIZE 0x19
95
96 enum {
97 ConfigReq = 1,
98 ConfigAck,
99 ConfigNak,
100 ConfigRej,
101 TerminateReq,
102 TerminateAck,
103 CodeRej,
104 ProtocolRej,
105 EchoReq,
106 EchoReply,
107 DiscardRequest,
108 IdentRequest
109 };
110
111 enum {
112 AccessRequest = 1,
113 AccessAccept,
114 AccessReject,
115 AccountingRequest,
116 AccountingResponse,
117 AccessChallenge = 11,
118 DisconnectRequest = 40,
119 DisconnectACK,
120 DisconnectNAK,
121 CoARequest,
122 CoAACK,
123 CoANAK
124 };
125
126 // PPP phases
127 enum {
128 Dead,
129 Establish,
130 Authenticate,
131 Network,
132 Terminate
133 };
134
135 // PPP states
136 enum {
137 Initial,
138 Starting,
139 Closed,
140 Stopped,
141 Closing,
142 Stopping,
143 RequestSent,
144 AckReceived,
145 AckSent,
146 Opened
147 };
148
149 // reset state machine counters
150 #define initialise_restart_count(_s, _fsm) \
151 sess_local[_s]._fsm.conf_sent = sess_local[_s]._fsm.nak_sent = 0
152
153 // increment ConfReq counter and reset timer
154 #define restart_timer(_s, _fsm) ({ \
155 sess_local[_s]._fsm.conf_sent++; \
156 sess_local[_s]._fsm.restart = \
157 time_now + config->ppp_restart_time; \
158 })
159
160 // stop timer on change to state where timer does not run
161 #define change_state(_s, _fsm, _new) ({ \
162 if (_new != session[_s].ppp._fsm) \
163 { \
164 switch (_new) \
165 { \
166 case Initial: \
167 case Starting: \
168 case Closed: \
169 case Stopped: \
170 case Opened: \
171 sess_local[_s]._fsm.restart = 0; \
172 initialise_restart_count(_s, _fsm); \
173 } \
174 session[_s].ppp._fsm = _new; \
175 cluster_send_session(_s); \
176 } \
177 })
178
179 // Types
180 typedef uint16_t sessionidt;
181 typedef uint16_t tunnelidt;
182 typedef uint32_t clockt;
183 typedef uint8_t hasht[16];
184
185 // CLI actions
186 struct cli_session_actions {
187 char action;
188 in_addr_t snoop_ip;
189 uint16_t snoop_port;
190 int throttle_in;
191 int throttle_out;
192 int filter_in;
193 int filter_out;
194 };
195
196 #define CLI_SESS_KILL 0x01
197 #define CLI_SESS_SNOOP 0x02
198 #define CLI_SESS_NOSNOOP 0x04
199 #define CLI_SESS_THROTTLE 0x08
200 #define CLI_SESS_NOTHROTTLE 0x10
201 #define CLI_SESS_FILTER 0x20
202 #define CLI_SESS_NOFILTER 0x40
203
204 struct cli_tunnel_actions {
205 char action;
206 };
207
208 #define CLI_TUN_KILL 0x01
209
210 // structures
211 typedef struct // route
212 {
213 in_addr_t ip;
214 in_addr_t mask;
215 }
216 routet;
217
218 typedef struct controls // control message
219 {
220 struct controls *next; // next in queue
221 uint16_t length; // length
222 uint8_t buf[MAXCONTROL];
223 }
224 controlt;
225
226 typedef struct
227 {
228 sessionidt next; // next session in linked list
229 sessionidt far; // far end session ID
230 tunnelidt tunnel; // near end tunnel ID
231 uint8_t flags; // session flags: see SESSION_*
232 struct {
233 uint8_t phase; // PPP phase
234 uint8_t lcp:4; // LCP state
235 uint8_t ipcp:4; // IPCP state
236 uint8_t ipv6cp:4; // IPV6CP state
237 uint8_t ccp:4; // CCP state
238 uint8_t pad; // unused
239 } ppp;
240 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
241 int ip_pool_index; // index to IP pool
242 uint32_t unique_id; // unique session id
243 uint16_t nr; // next receive
244 uint16_t ns; // next send
245 uint32_t magic; // ppp magic number
246 uint32_t pin, pout; // packet counts
247 uint32_t cin, cout; // byte counts
248 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
249 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
250 uint16_t throttle_in; // upstream throttle rate (kbps)
251 uint16_t throttle_out; // downstream throttle rate
252 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
253 uint8_t filter_out; // output filter index
254 uint16_t mru; // maximum receive unit
255 clockt opened; // when started
256 clockt die; // being closed, when to finally free
257 time_t last_packet; // Last packet from the user (used for idle timeouts)
258 in_addr_t dns1, dns2; // DNS servers
259 routet route[MAXROUTE]; // static routes
260 uint16_t tbf_in; // filter bucket for throttling in from the user.
261 uint16_t tbf_out; // filter bucket for throttling out to the user.
262 int random_vector_length;
263 uint8_t random_vector[MAXTEL];
264 char user[MAXUSER]; // user (needed in seesion for radius stop messages)
265 char called[MAXTEL]; // called number
266 char calling[MAXTEL]; // calling number
267 uint32_t tx_connect_speed;
268 uint32_t rx_connect_speed;
269 in_addr_t snoop_ip; // Interception destination IP
270 uint16_t snoop_port; // Interception destination port
271 uint8_t walled_garden; // is this session gardened?
272 uint8_t ipv6prefixlen; // IPv6 route prefix length
273 struct in6_addr ipv6route; // Static IPv6 route
274 char reserved[11]; // Space to expand structure without changing HB_VERSION
275 }
276 sessiont;
277
278 #define AUTHPAP 1 // allow PAP
279 #define AUTHCHAP 2 // allow CHAP
280
281 typedef struct
282 {
283 // packet counters
284 uint32_t pin;
285 uint32_t pout;
286
287 // byte counters
288 uint32_t cin;
289 uint32_t cout;
290
291 // PPP restart timer/counters
292 struct {
293 time_t restart;
294 int conf_sent;
295 int nak_sent;
296 } lcp, ipcp, ipv6cp, ccp;
297
298 // identifier for Protocol-Reject, Code-Reject
299 uint8_t lcp_ident;
300
301 // authentication to use
302 int lcp_authtype;
303
304 // our MRU
305 uint16_t ppp_mru;
306
307 // DoS prevention
308 clockt last_packet_out;
309 uint32_t packets_out;
310 uint32_t packets_dropped;
311
312 // RADIUS session in use
313 uint16_t radius;
314
315 // interim RADIUS
316 time_t last_interim;
317
318 // last LCP Echo
319 time_t last_echo;
320 } sessionlocalt;
321
322 // session flags
323 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
324 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
325 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
326
327 // 168 bytes per tunnel
328 typedef struct
329 {
330 tunnelidt far; // far end tunnel ID
331 in_addr_t ip; // Ip for far end
332 uint16_t port; // port for far end
333 uint16_t window; // Rx window
334 uint16_t nr; // next receive
335 uint16_t ns; // next send
336 int state; // current state (tunnelstate enum)
337 clockt last; // when last control message sent (used for resend timeout)
338 clockt retry; // when to try resending pending control
339 clockt die; // being closed, when to finally free
340 clockt lastrec; // when the last control message was received
341 char hostname[128]; // tunnel hostname
342 char vendor[128]; // LAC vendor
343 uint8_t try; // number of retrys on a control message
344 uint16_t controlc; // outstaind messages in queue
345 controlt *controls; // oldest message
346 controlt *controle; // newest message
347 }
348 tunnelt;
349
350 // 160 bytes per radius session
351 typedef struct // outstanding RADIUS requests
352 {
353 sessionidt session; // which session this applies to
354 hasht auth; // request authenticator
355 clockt retry; // when to try next
356 char pass[129]; // password
357 uint8_t id; // ID for PPP response
358 uint8_t try; // which try we are on
359 uint8_t state; // state of radius requests
360 uint8_t chap; // set if CHAP used (is CHAP identifier)
361 }
362 radiust;
363
364 typedef struct
365 {
366 in_addr_t address; // Host byte order..
367 char assigned; // 1 if assigned, 0 if free
368 sessionidt session;
369 clockt last; // last used
370 char user[129]; // user (try to have ip addresses persistent)
371 }
372 ippoolt;
373
374 #ifdef RINGBUFFER
375 struct Tringbuffer
376 {
377 struct {
378 char level;
379 sessionidt session;
380 tunnelidt tunnel;
381 char message[MAX_LOG_LENGTH];
382 } buffer[RINGBUFFER_SIZE];
383 int head;
384 int tail;
385 };
386 #endif
387
388 /*
389 * Possible tunnel states
390 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
391 */
392 enum
393 {
394 TUNNELFREE, // Not in use
395 TUNNELOPEN, // Active tunnel
396 TUNNELDIE, // Currently closing
397 TUNNELOPENING, // Busy opening
398 TUNNELUNDEF, // Undefined
399 };
400
401 enum
402 {
403 RADIUSNULL, // Not in use
404 RADIUSCHAP, // sending CHAP down PPP
405 RADIUSAUTH, // sending auth to RADIUS server
406 RADIUSSTART, // sending start accounting to RADIUS server
407 RADIUSSTOP, // sending stop accounting to RADIUS server
408 RADIUSINTERIM, // sending interim accounting to RADIUS server
409 RADIUSWAIT, // waiting timeout before available, in case delayed replies
410 };
411
412 struct Tstats
413 {
414 time_t start_time;
415 time_t last_reset;
416
417 uint32_t tun_rx_packets;
418 uint32_t tun_tx_packets;
419 uint32_t tun_rx_bytes;
420 uint32_t tun_tx_bytes;
421 uint32_t tun_rx_errors;
422 uint32_t tun_tx_errors;
423 uint32_t tun_rx_dropped;
424
425 uint32_t tunnel_rx_packets;
426 uint32_t tunnel_tx_packets;
427 uint32_t tunnel_rx_bytes;
428 uint32_t tunnel_tx_bytes;
429 uint32_t tunnel_rx_errors;
430 uint32_t tunnel_tx_errors;
431
432 uint32_t tunnel_retries;
433 uint32_t radius_retries;
434
435 uint32_t arp_sent;
436
437 uint32_t packets_snooped;
438
439 uint32_t tunnel_created;
440 uint32_t session_created;
441 uint32_t tunnel_timeout;
442 uint32_t session_timeout;
443 uint32_t radius_timeout;
444 uint32_t radius_overflow;
445 uint32_t tunnel_overflow;
446 uint32_t session_overflow;
447
448 uint32_t ip_allocated;
449 uint32_t ip_freed;
450
451 uint32_t c_forwarded;
452 uint32_t recv_forward;
453
454 uint32_t select_called;
455 uint32_t multi_read_used;
456 uint32_t multi_read_exceeded;
457
458 #ifdef STATISTICS
459 uint32_t call_processtun;
460 uint32_t call_processipout;
461 uint32_t call_processipv6out;
462 uint32_t call_processudp;
463 uint32_t call_sessionbyip;
464 uint32_t call_sessionbyipv6;
465 uint32_t call_sessionbyuser;
466 uint32_t call_sendarp;
467 uint32_t call_sendipcp;
468 uint32_t call_sendipv6cp;
469 uint32_t call_processipv6cp;
470 uint32_t call_tunnelsend;
471 uint32_t call_sessionkill;
472 uint32_t call_sessionshutdown;
473 uint32_t call_tunnelkill;
474 uint32_t call_tunnelshutdown;
475 uint32_t call_assign_ip_address;
476 uint32_t call_free_ip_address;
477 uint32_t call_dump_acct_info;
478 uint32_t call_sessionsetup;
479 uint32_t call_processpap;
480 uint32_t call_processchap;
481 uint32_t call_processlcp;
482 uint32_t call_processipcp;
483 uint32_t call_processipin;
484 uint32_t call_processipv6in;
485 uint32_t call_processccp;
486 uint32_t call_sendchap;
487 uint32_t call_processrad;
488 uint32_t call_radiussend;
489 uint32_t call_radiusretry;
490 uint32_t call_random_data;
491 #endif
492 };
493
494 #ifdef STATISTICS
495
496 #ifdef STAT_CALLS
497 #define CSTAT(x) STAT(call_ ## x)
498 #else
499 #define CSTAT(x)
500 #endif
501
502 #define STAT(x) (_statistics->x++)
503 #define INC_STAT(x,y) (_statistics->x += (y))
504 #define GET_STAT(x) (_statistics->x)
505 #define SET_STAT(x, y) (_statistics->x = (y))
506 #else
507 #define CSTAT(x)
508 #define STAT(x)
509 #define INC_STAT(x,y)
510 #define GET_STAT(x) 0
511 #define SET_STAT(x, y)
512 #endif
513
514 typedef struct
515 {
516 int debug; // debugging level
517 time_t start_time; // time when l2tpns was started
518 char bandwidth[256]; // current bandwidth
519 char pid_file[256]; // file to write PID to on startup
520 int wrote_pid;
521 clockt current_time; // 1/10ths of a second since the process started.
522 // means that we can only run a given process
523 // for 13 years without re-starting!
524
525 char config_file[128];
526 int reload_config; // flag to re-read config (set by cli)
527 int multi_read_count; // amount of packets to read per fd in processing loop
528
529 char tundevice[10]; // tun device name
530 char log_filename[128];
531
532 char l2tp_secret[64]; // L2TP shared secret
533 int l2tp_mtu; // MTU of interface used for L2TP
534
535 char random_device[256]; // random device path, defaults to RANDOMDEVICE
536
537 int ppp_restart_time; // timeout for PPP restart
538 int ppp_max_configure; // max lcp configure requests to send
539 int ppp_max_failure; // max lcp configure naks to send
540
541 char radiussecret[64];
542 int radius_accounting;
543 int radius_interim;
544 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
545 uint16_t radiusport[MAXRADSERVER]; // radius base ports
546 uint8_t numradiusservers; // radius server count
547
548 uint16_t radius_dae_port; // local port for radius dae
549
550 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
551 int radius_authtypes;
552 int radius_authprefer;
553
554 int allow_duplicate_users; // allow multiple logins with the same username
555
556 in_addr_t default_dns1, default_dns2;
557
558 unsigned long rl_rate; // default throttle rate
559 int num_tbfs; // number of throttle buckets
560
561 char accounting_dir[128];
562 in_addr_t bind_address;
563 in_addr_t peer_address;
564 int send_garp; // Set to true to garp for vip address on startup
565
566 int target_uid;
567 int dump_speed;
568 char plugins[64][MAXPLUGINS];
569 char old_plugins[64][MAXPLUGINS];
570
571 int next_tbf; // Next HTB id available to use
572 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
573 // policy for this process.
574 int lock_pages; // Lock pages into memory.
575 int icmp_rate; // Max number of ICMP unreachable per second to send
576 int max_packets; // DoS prevention: per session limit of packets/0.1s
577
578 in_addr_t cluster_address; // Multicast address of cluster.
579 // Send to this address to have everyone hear.
580 char cluster_interface[64]; // Which interface to listen for multicast on.
581 int cluster_iam_master; // Are we the cluster master???
582 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
583 in_addr_t cluster_master_address; // The network address of the cluster master.
584 // Zero if i am the cluster master.
585 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
586 // (or the seq number we're next expecting if we're a slave).
587 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
588 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
589 int cluster_highest_sessionid;
590 int cluster_highest_tunnelid;
591 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
592 int cluster_last_hb_ver; // Heartbeat version last seen from master
593 int cluster_num_changes; // Number of changes queued.
594
595 int cluster_mcast_ttl; // TTL for multicast packets
596 int cluster_hb_interval; // How often to send a heartbeat.
597 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
598 uint64_t cluster_table_version; // # state changes processed by cluster
599
600 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
601
602
603 int cluster_master_min_adv; // Master advertises routes while the number of up to date
604 // slaves is less than this value.
605
606 #ifdef BGP
607 #define BGP_NUM_PEERS 2
608 uint16_t as_number;
609 struct {
610 char name[64];
611 uint16_t as;
612 int keepalive;
613 int hold;
614 } neighbour[BGP_NUM_PEERS];
615 #endif
616 } configt;
617
618 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6, MAC };
619 typedef struct
620 {
621 char *key;
622 int offset;
623 int size;
624 enum config_typet type;
625 } config_descriptt;
626
627 typedef struct
628 {
629 uint8_t op; // operation
630 #define FILTER_PORT_OP_NONE 0 // all ports match
631 #define FILTER_PORT_OP_EQ 1
632 #define FILTER_PORT_OP_NEQ 2
633 #define FILTER_PORT_OP_GT 3
634 #define FILTER_PORT_OP_LT 4
635 #define FILTER_PORT_OP_RANGE 5
636 uint16_t port; // port (host byte order)
637 uint16_t port2; // range
638 } ip_filter_portt;
639
640 typedef struct
641 {
642 int action; // permit/deny
643 #define FILTER_ACTION_DENY 1
644 #define FILTER_ACTION_PERMIT 2
645 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
646 in_addr_t src_ip; // source ip (network byte order)
647 in_addr_t src_wild;
648 ip_filter_portt src_ports;
649 in_addr_t dst_ip; // dest ip
650 in_addr_t dst_wild;
651 ip_filter_portt dst_ports;
652 uint8_t frag; // apply to non-initial fragments
653 uint8_t tcp_flag_op; // match type: any, all, established
654 #define FILTER_FLAG_OP_ANY 1
655 #define FILTER_FLAG_OP_ALL 2
656 #define FILTER_FLAG_OP_EST 3
657 uint8_t tcp_sflags; // flags set
658 uint8_t tcp_cflags; // flags clear
659 uint32_t counter; // match count
660 } ip_filter_rulet;
661
662 #define TCP_FLAG_FIN 0x01
663 #define TCP_FLAG_SYN 0x02
664 #define TCP_FLAG_RST 0x04
665 #define TCP_FLAG_PSH 0x08
666 #define TCP_FLAG_ACK 0x10
667 #define TCP_FLAG_URG 0x20
668
669 #define MAXFILTER 32
670 #define MAXFILTER_RULES 32
671 typedef struct
672 {
673 char name[32]; // ACL name
674 int extended; // type: 0 = standard, 1 = extended
675 ip_filter_rulet rules[MAXFILTER_RULES];
676 int used; // session ref count
677 } ip_filtert;
678
679 // arp.c
680 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
681
682
683 // ppp.c
684 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
685 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
686 void lcp_open(sessionidt s, tunnelidt t);
687 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
688 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
689 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
690 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
691 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
692 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
693 void sendchap(sessionidt s, tunnelidt t);
694 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype);
695 void sendlcp(sessionidt s, tunnelidt t);
696 void send_ipin(sessionidt s, uint8_t *buf, int len);
697 void sendccp(sessionidt s, tunnelidt t);
698
699
700 // radius.c
701 void initrad(void);
702 void radiussend(uint16_t r, uint8_t state);
703 void processrad(uint8_t *buf, int len, char socket_index);
704 void radiusretry(uint16_t r);
705 uint16_t radiusnew(sessionidt s);
706 void radiusclear(uint16_t r, sessionidt s);
707 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen);
708
709
710 // l2tpns.c
711 clockt backoff(uint8_t try);
712 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
713 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
714 sessionidt sessionbyip(in_addr_t ip);
715 sessionidt sessionbyipv6(struct in6_addr ip);
716 sessionidt sessionbyuser(char *username);
717 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
718 void random_data(uint8_t *buf, int len);
719 void sessionkill(sessionidt s, char *reason);
720 void sessionshutdown(sessionidt s, char *reason, int result, int error);
721 void filter_session(sessionidt s, int filter_in, int filter_out);
722 void send_garp(in_addr_t ip);
723 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
724 int tun_write(uint8_t *data, int size);
725 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
726 void sendipcp(sessionidt s, tunnelidt t);
727 void sendipv6cp(sessionidt s, tunnelidt t);
728 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
729 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
730 int find_filter(char const *name, size_t len);
731 int ip_filter(uint8_t *buf, int len, uint8_t filter);
732 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
733 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
734 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
735
736 #undef LOG
737 #undef LOG_HEX
738 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
739 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
740
741 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
742 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
743
744 int sessionsetup(sessionidt s, tunnelidt t);
745 int run_plugins(int plugin_type, void *data);
746 void rebuild_address_pool(void);
747 void throttle_session(sessionidt s, int rate_in, int rate_out);
748 int load_session(sessionidt, sessiont *);
749 void become_master(void); // We're the master; kick off any required master initializations.
750
751
752 // cli.c
753 void init_cli(char *hostname);
754 void cli_do_file(FILE *fh);
755 void cli_do(int sockfd);
756 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
757
758
759 // icmp.c
760 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
761
762
763 extern tunnelt *tunnel;
764 extern sessiont *session;
765 extern sessionlocalt *sess_local;
766 extern ippoolt *ip_address_pool;
767 #define sessionfree (session[0].next)
768
769 #define log_backtrace(count, max) \
770 if (count++ < max) { \
771 void *array[20]; \
772 char **strings; \
773 int size, i; \
774 LOG(0, 0, t, "Backtrace follows:\n"); \
775 size = backtrace(array, 10); \
776 strings = backtrace_symbols(array, size); \
777 if (strings) for (i = 0; i < size; i++) \
778 { \
779 LOG(0, 0, t, " %s\n", strings[i]); \
780 } \
781 free(strings); \
782 }
783
784
785 extern configt *config;
786 extern time_t basetime; // Time when this process started.
787 extern time_t time_now; // Seconds since EPOCH.
788 extern char main_quit;
789 extern uint32_t last_id;
790 extern struct Tstats *_statistics;
791 extern in_addr_t my_address;
792 extern int clifd;
793 extern int epollfd;
794
795 struct event_data {
796 enum {
797 FD_TYPE_CLI,
798 FD_TYPE_CLUSTER,
799 FD_TYPE_TUN,
800 FD_TYPE_UDP,
801 FD_TYPE_CONTROL,
802 FD_TYPE_DAE,
803 FD_TYPE_RADIUS,
804 FD_TYPE_BGP,
805 } type;
806 int index; // for RADIUS, BGP
807 };
808
809 #define TIME (config->current_time)
810
811 extern uint16_t MRU;
812 extern uint16_t MSS;
813
814 // macros for handling help in cli commands
815 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
816 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
817
818 // CVS identifiers (for "show version file")
819 extern char const *cvs_id_arp;
820 extern char const *cvs_id_cli;
821 extern char const *cvs_id_cluster;
822 extern char const *cvs_id_constants;
823 extern char const *cvs_id_control;
824 extern char const *cvs_id_icmp;
825 extern char const *cvs_id_l2tpns;
826 extern char const *cvs_id_ll;
827 extern char const *cvs_id_md5;
828 extern char const *cvs_id_ppp;
829 extern char const *cvs_id_radius;
830 extern char const *cvs_id_tbf;
831 extern char const *cvs_id_util;
832
833 #endif /* __L2TPNS_H__ */