ffa09ccb881ada71f209bef5369a5a4ca592a492
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.121 2009-12-08 14:49:28 bodea Exp $
3
4 #ifndef __L2TPNS_H__
5 #define __L2TPNS_H__
6
7 #include <netinet/in.h>
8 #include <stdio.h>
9 #include <signal.h>
10 #include <stdlib.h>
11 #include <netinet/in.h>
12 #include <net/ethernet.h>
13 #include <sys/socket.h>
14 #include <arpa/inet.h>
15 #include <sys/types.h>
16 #include <libcli.h>
17
18 #define VERSION "2.2.1"
19
20 // Limits
21 #define MAXTUNNEL 500 // could be up to 65535
22 #define MAXBUNDLE 300 // could be up to 65535
23 #define MAXBUNDLESES 12 // Maximum number of member links in bundle
24 #define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address
25 #define MAXSESSION 60000 // could be up to 65535
26 #define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
27
28 // Tunnel Id reserved for pppoe
29 #define TUNNEL_ID_PPPOE 1
30
31 #define RADIUS_SHIFT 6
32 #define RADIUS_FDS (1 << RADIUS_SHIFT)
33 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
34 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
35
36 #define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
37 #define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
38
39 #define MAXCONTROL 1000 // max length control message we ever send...
40 #define MINMTU 576 // minimum recommended MTU (rfc1063)
41 #define MAXMTU 2600 // arbitrary maximum MTU
42 #define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
43 #define MAXETHER (MAXMTU+18) // max packet we try sending to tun
44 #define MAXTEL 96 // telephone number
45 #define MAXHOSTNAME 256 // hostname
46 #define MAXUSER 128 // username
47 #define MAXPASS 128 // password
48 #define MAXCLASS 128 // radius class attribute size
49 #define MAXPLUGINS 20 // maximum number of plugins to load
50 #define MAXRADSERVER 10 // max radius servers
51 #define MAXROUTE 10 // max static routes per session
52 #define MAXIPPOOL 131072 // max number of ip addresses in pool
53 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
54 #define MAX_LOG_LENGTH 512 // Maximum size of log message
55 #define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation
56 #define IDLE_ECHO_TIMEOUT 240 // Time between last packet seen and session shutdown
57 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
58
59 #define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header
60 #define MP_END 0x40 // This value is used when (e)nd bit is set in MP header
61 #define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header
62
63 #define MINFRAGLEN 64 // Minumum fragment length
64 #define MAXFRAGLEN 1496 // Maximum length for Multilink fragment (The multilink may contain only one link)
65 #define MAXFRAGNUM 512 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
66 // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
67 #define MAXFRAGNUM_MASK 511 // Must be equal to MAXFRAGNUM-1
68
69 // Constants
70 #ifndef ETCDIR
71 #define ETCDIR "/etc/l2tpns"
72 #endif
73
74 #ifndef LIBDIR
75 #define LIBDIR "/usr/lib/l2tpns"
76 #endif
77
78 #ifndef PLUGINDIR
79 #define PLUGINDIR LIBDIR // Plugins
80 #endif
81
82 #ifndef PLUGINCONF
83 #define PLUGINCONF ETCDIR // Plugin config dir
84 #endif
85
86 #ifndef FLASHDIR
87 #define FLASHDIR ETCDIR
88 #endif
89
90 #define TUNDEVICE "/dev/net/tun"
91 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
92 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
93 #define CLIUSERS FLASHDIR "/users" // CLI Users file
94 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
95 #define ACCT_TIME 3000 // 5 minute accounting interval
96 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
97 #define L2TPPORT 1701 // L2TP port
98 #define RADPORT 1645 // old radius port...
99 #define DAEPORT 3799 // DAE port
100 #define PKTARP 0x0806 // ARP packet type
101 #define PKTIP 0x0800 // IPv4 packet type
102 #define PKTIPV6 0x86DD // IPv6 packet type
103 #define PPPPAP 0xC023
104 #define PPPCHAP 0xC223
105 #define PPPLCP 0xC021
106 #define PPPIPCP 0x8021
107 #define PPPIPV6CP 0x8057
108 #define PPPCCP 0x80FD
109 #define PPPIP 0x0021
110 #define PPPIPV6 0x0057
111 #define PPPMP 0x003D
112 #define MIN_IP_SIZE 0x19
113
114 enum {
115 ConfigReq = 1,
116 ConfigAck,
117 ConfigNak,
118 ConfigRej,
119 TerminateReq,
120 TerminateAck,
121 CodeRej,
122 ProtocolRej,
123 EchoReq,
124 EchoReply,
125 DiscardRequest,
126 IdentRequest
127 };
128
129 enum {
130 AccessRequest = 1,
131 AccessAccept,
132 AccessReject,
133 AccountingRequest,
134 AccountingResponse,
135 AccessChallenge = 11,
136 DisconnectRequest = 40,
137 DisconnectACK,
138 DisconnectNAK,
139 CoARequest,
140 CoAACK,
141 CoANAK
142 };
143
144 // PPP phases
145 enum {
146 Dead,
147 Establish,
148 Authenticate,
149 Network,
150 Terminate
151 };
152
153 // PPP states
154 enum {
155 Initial,
156 Starting,
157 Closed,
158 Stopped,
159 Closing,
160 Stopping,
161 RequestSent,
162 AckReceived,
163 AckSent,
164 Opened
165 };
166
167 // reset state machine counters
168 #define initialise_restart_count(_s, _fsm) \
169 sess_local[_s]._fsm.conf_sent = \
170 sess_local[_s]._fsm.nak_sent = 0
171
172 // no more attempts
173 #define zero_restart_count(_s, _fsm) ({ \
174 sess_local[_s]._fsm.conf_sent = \
175 config->ppp_max_configure; \
176 sess_local[_s]._fsm.restart = \
177 time_now + config->ppp_restart_time; \
178 })
179
180 // increment ConfReq counter and reset timer
181 #define restart_timer(_s, _fsm) ({ \
182 sess_local[_s]._fsm.conf_sent++; \
183 sess_local[_s]._fsm.restart = \
184 time_now + config->ppp_restart_time; \
185 })
186
187 // stop timer on change to state where timer does not run
188 #define change_state(_s, _fsm, _new) ({ \
189 if (_new != session[_s].ppp._fsm) \
190 { \
191 switch (_new) \
192 { \
193 case Initial: \
194 case Starting: \
195 case Closed: \
196 case Stopped: \
197 case Opened: \
198 sess_local[_s]._fsm.restart = 0; \
199 initialise_restart_count(_s, _fsm); \
200 } \
201 session[_s].ppp._fsm = _new; \
202 cluster_send_session(_s); \
203 } \
204 })
205
206 // Types
207 typedef uint16_t sessionidt;
208 typedef uint16_t bundleidt;
209 typedef uint16_t tunnelidt;
210 typedef uint32_t clockt;
211 typedef uint8_t hasht[16];
212
213 // CLI actions
214 struct cli_session_actions {
215 char action;
216 in_addr_t snoop_ip;
217 uint16_t snoop_port;
218 int throttle_in;
219 int throttle_out;
220 int filter_in;
221 int filter_out;
222 };
223
224 #define CLI_SESS_KILL 0x01
225 #define CLI_SESS_SNOOP 0x02
226 #define CLI_SESS_NOSNOOP 0x04
227 #define CLI_SESS_THROTTLE 0x08
228 #define CLI_SESS_NOTHROTTLE 0x10
229 #define CLI_SESS_FILTER 0x20
230 #define CLI_SESS_NOFILTER 0x40
231
232 struct cli_tunnel_actions {
233 char action;
234 };
235
236 #define CLI_TUN_KILL 0x01
237
238 // structures
239 typedef struct // route
240 {
241 in_addr_t ip;
242 int prefixlen;
243 }
244 routet;
245
246 typedef struct controls // control message
247 {
248 struct controls *next; // next in queue
249 uint16_t length; // length
250 union {
251 uint8_t buf[MAXCONTROL];
252 uint16_t buf16[MAXCONTROL/2];
253 } __attribute__ ((__transparent_union__));
254 }
255 controlt;
256
257 typedef struct {
258 uint8_t length; // Endpoint Discriminator length
259 uint8_t addr_class; // Endpoint Discriminator class
260 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
261 } epdist;
262
263 typedef struct {
264 sessionidt sid; // Fragment originating session
265 tunnelidt tid; // Fragment originating tunnel
266 uint8_t flags; // MP frame flags
267 uint32_t seq; // fragment seq num
268 uint32_t jitteravg;
269 uint16_t length; // Fragment length
270 uint8_t data[MAXFRAGLEN]; // Fragment data
271 } fragmentt;
272
273 typedef struct
274 {
275 sessionidt next; // next session in linked list
276 sessionidt far; // far end session ID
277 tunnelidt tunnel; // near end tunnel ID
278 uint8_t flags; // session flags: see SESSION_*
279 struct {
280 uint8_t phase; // PPP phase
281 uint8_t lcp:4; // LCP state
282 uint8_t ipcp:4; // IPCP state
283 uint8_t ipv6cp:4; // IPV6CP state
284 uint8_t ccp:4; // CCP state
285 } ppp;
286 uint16_t mru; // maximum receive unit
287 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
288 int ip_pool_index; // index to IP pool
289 uint32_t unique_id; // unique session id
290 uint32_t magic; // ppp magic number
291 uint32_t pin, pout; // packet counts
292 uint32_t cin, cout; // byte counts
293 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
294 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
295 uint16_t throttle_in; // upstream throttle rate (kbps)
296 uint16_t throttle_out; // downstream throttle rate
297 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
298 uint8_t filter_out; // output filter index
299 uint16_t snoop_port; // Interception destination port
300 in_addr_t snoop_ip; // Interception destination IP
301 clockt opened; // when started
302 clockt die; // being closed, when to finally free
303 uint32_t session_timeout; // Maximum session time in seconds
304 uint32_t idle_timeout; // Maximum idle time in seconds
305 time_t last_packet; // Last packet from the user (used for idle timeouts)
306 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
307 in_addr_t dns1, dns2; // DNS servers
308 routet route[MAXROUTE]; // static routes
309 uint16_t tbf_in; // filter bucket for throttling in from the user.
310 uint16_t tbf_out; // filter bucket for throttling out to the user.
311 int random_vector_length;
312 uint8_t random_vector[MAXTEL];
313 char user[MAXUSER]; // user (needed in session for radius stop messages)
314 char called[MAXTEL]; // called number
315 char calling[MAXTEL]; // calling number
316 uint32_t tx_connect_speed;
317 uint32_t rx_connect_speed;
318 clockt timeout; // Session timeout
319 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
320 epdist epdis; // Multilink Endpoint Discriminator
321 bundleidt bundle; // Multilink Bundle Identifier
322 uint8_t mssf; // Multilink Short Sequence Number Header Format
323 uint8_t walled_garden; // is this session gardened?
324 uint8_t classlen; // class (needed for radius accounting messages)
325 char class[MAXCLASS];
326 uint8_t ipv6prefixlen; // IPv6 route prefix length
327 struct in6_addr ipv6route; // Static IPv6 route
328 #ifdef LAC
329 sessionidt forwardtosession; // LNS id_session to forward
330 uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes)
331 char reserved[4]; // Space to expand structure without changing HB_VERSION
332 #else
333 uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes)
334 char reserved[6]; // Space to expand structure without changing HB_VERSION
335 #endif
336 }
337 sessiont;
338
339 typedef struct
340 {
341 int state; // current state (bundlestate enum)
342 uint32_t seq_num_t; // Sequence Number (transmission)
343 uint32_t timeout; // Session-Timeout for bundle
344 uint32_t max_seq; // Max value of sequence number field
345 uint8_t num_of_links; // Number of links joint to this bundle
346 uint32_t online_time; // The time this bundle is online
347 clockt last_check; // Last time the timeout is checked
348 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
349 uint8_t mssf; // Multilink Short Sequence Number Header Format
350 epdist epdis; // Multilink Endpoint Discriminator
351 char user[MAXUSER]; // Needed for matching member links
352 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
353 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
354 }
355 bundlet;
356
357 typedef struct
358 {
359 fragmentt fragment[MAXFRAGNUM];
360 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
361 uint16_t re_frame_len; // The reassembled frame length
362 uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
363 uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
364 uint32_t M; // Minumum frame sequence number received over all bundle members
365 uint32_t start_seq; // Last received frame sequence number (bearing B bit)
366 }
367 fragmentationt;
368
369 #define AUTHPAP 1 // allow PAP
370 #define AUTHCHAP 2 // allow CHAP
371
372 typedef struct
373 {
374 // packet counters
375 uint32_t pin;
376 uint32_t pout;
377
378 // byte counters
379 uint32_t cin;
380 uint32_t cout;
381
382 // PPP restart timer/counters
383 struct {
384 time_t restart;
385 int conf_sent;
386 int nak_sent;
387 } lcp, ipcp, ipv6cp, ccp;
388
389 // identifier for Protocol-Reject, Code-Reject
390 uint8_t lcp_ident;
391
392 // authentication to use
393 int lcp_authtype;
394
395 // our MRU
396 uint16_t ppp_mru;
397
398 // our MRRU
399 uint16_t mp_mrru;
400
401 // our mssf
402 uint16_t mp_mssf;
403
404 // our Endpoint Discriminator
405 in_addr_t mp_epdis;
406
407 // DoS prevention
408 clockt last_packet_out;
409 uint32_t packets_out;
410 uint32_t packets_dropped;
411
412 // RADIUS session in use
413 uint16_t radius;
414
415 // interim RADIUS
416 time_t last_interim;
417
418 // last LCP Echo
419 time_t last_echo;
420
421 // Last Multilink frame sequence number received
422 uint32_t last_seq;
423
424 // jitter average of the session
425 uint32_t jitteravg;
426 // time in milliseconds of the last fragment.
427 uint64_t prev_time;
428 } sessionlocalt;
429
430 // session flags
431 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
432 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
433 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
434
435 // 328 bytes per tunnel
436 typedef struct
437 {
438 tunnelidt far; // far end tunnel ID
439 in_addr_t ip; // Ip for far end
440 uint16_t port; // port for far end
441 uint16_t window; // Rx window
442 uint16_t nr; // next receive
443 uint16_t ns; // next send
444 int state; // current state (tunnelstate enum)
445 clockt last; // when last control message sent (used for resend timeout)
446 clockt retry; // when to try resending pending control
447 clockt die; // being closed, when to finally free
448 clockt lastrec; // when the last control message was received
449 char hostname[128]; // tunnel hostname
450 char vendor[128]; // LAC vendor
451 uint8_t try; // number of retrys on a control message
452 uint16_t controlc; // outstaind messages in queue
453 controlt *controls; // oldest message
454 controlt *controle; // newest message
455 #ifdef LAC
456 uint16_t isremotelns; // != 0 if the tunnel is to remote LNS (== index on the conf remote lns)
457 char reserved[14]; // Space to expand structure without changing HB_VERSION
458 #else
459 char reserved[16]; // Space to expand structure without changing HB_VERSION
460 #endif
461 }
462 tunnelt;
463
464 // 164 bytes per radius session
465 typedef struct // outstanding RADIUS requests
466 {
467 sessionidt session; // which session this applies to
468 hasht auth; // request authenticator
469 clockt retry; // when to try next
470 char pass[129]; // password
471 uint8_t id; // ID for PPP response
472 uint8_t try; // which try we are on
473 uint8_t state; // state of radius requests
474 uint8_t chap; // set if CHAP used (is CHAP identifier)
475 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
476 char const *term_msg; // terminate reason
477 }
478 radiust;
479
480 typedef struct
481 {
482 in_addr_t address; // Host byte order..
483 char assigned; // 1 if assigned, 0 if free
484 sessionidt session;
485 clockt last; // last used
486 char user[129]; // user (try to have ip addresses persistent)
487 }
488 ippoolt;
489
490 #ifdef RINGBUFFER
491 struct Tringbuffer
492 {
493 struct {
494 char level;
495 sessionidt session;
496 tunnelidt tunnel;
497 char message[MAX_LOG_LENGTH];
498 } buffer[RINGBUFFER_SIZE];
499 int head;
500 int tail;
501 };
502 #endif
503
504 /*
505 * Possible tunnel states
506 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
507 */
508 enum
509 {
510 TUNNELFREE, // Not in use
511 TUNNELOPEN, // Active tunnel
512 TUNNELDIE, // Currently closing
513 TUNNELOPENING, // Busy opening
514 TUNNELUNDEF, // Undefined
515 };
516
517 enum
518 {
519 BUNDLEFREE, // Not in use
520 BUNDLEOPEN, // Active bundle
521 BUNDLEUNDEF, // Undefined
522 };
523
524 enum
525 {
526 NULLCLASS = 0, //End Point Discriminator classes
527 LOCALADDR,
528 IPADDR,
529 IEEEMACADDR,
530 PPPMAGIC,
531 PSNDN,
532 };
533
534 enum
535 {
536 RADIUSNULL, // Not in use
537 RADIUSCHAP, // sending CHAP down PPP
538 RADIUSAUTH, // sending auth to RADIUS server
539 RADIUSSTART, // sending start accounting to RADIUS server
540 RADIUSSTOP, // sending stop accounting to RADIUS server
541 RADIUSINTERIM, // sending interim accounting to RADIUS server
542 RADIUSWAIT, // waiting timeout before available, in case delayed replies
543 RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
544 };
545
546 struct Tstats
547 {
548 time_t start_time;
549 time_t last_reset;
550
551 uint32_t tun_rx_packets;
552 uint32_t tun_tx_packets;
553 uint32_t tun_rx_bytes;
554 uint32_t tun_tx_bytes;
555 uint32_t tun_rx_errors;
556 uint32_t tun_tx_errors;
557 uint32_t tun_rx_dropped;
558
559 uint32_t tunnel_rx_packets;
560 uint32_t tunnel_tx_packets;
561 uint32_t tunnel_rx_bytes;
562 uint32_t tunnel_tx_bytes;
563 uint32_t tunnel_rx_errors;
564 uint32_t tunnel_tx_errors;
565
566 uint32_t tunnel_retries;
567 uint32_t radius_retries;
568
569 uint32_t arp_sent;
570
571 uint32_t packets_snooped;
572
573 uint32_t tunnel_created;
574 uint32_t session_created;
575 uint32_t tunnel_timeout;
576 uint32_t session_timeout;
577 uint32_t radius_timeout;
578 uint32_t radius_overflow;
579 uint32_t tunnel_overflow;
580 uint32_t session_overflow;
581
582 uint32_t ip_allocated;
583 uint32_t ip_freed;
584
585 uint32_t c_forwarded;
586 uint32_t recv_forward;
587
588 uint32_t select_called;
589 uint32_t multi_read_used;
590 uint32_t multi_read_exceeded;
591
592 #ifdef STATISTICS
593 uint32_t call_processtun;
594 uint32_t call_processipout;
595 uint32_t call_processipv6out;
596 uint32_t call_processudp;
597 uint32_t call_sessionbyip;
598 uint32_t call_sessionbyipv6;
599 uint32_t call_sessionbyuser;
600 uint32_t call_sendarp;
601 uint32_t call_sendipcp;
602 uint32_t call_sendipv6cp;
603 uint32_t call_processipv6cp;
604 uint32_t call_tunnelsend;
605 uint32_t call_sessionkill;
606 uint32_t call_sessionshutdown;
607 uint32_t call_tunnelkill;
608 uint32_t call_tunnelshutdown;
609 uint32_t call_assign_ip_address;
610 uint32_t call_free_ip_address;
611 uint32_t call_dump_acct_info;
612 uint32_t call_sessionsetup;
613 uint32_t call_processpap;
614 uint32_t call_processchap;
615 uint32_t call_processlcp;
616 uint32_t call_processipcp;
617 uint32_t call_processipin;
618 uint32_t call_processipv6in;
619 uint32_t call_processccp;
620 uint32_t call_sendchap;
621 uint32_t call_processrad;
622 uint32_t call_radiussend;
623 uint32_t call_radiusretry;
624 uint32_t call_random_data;
625 #endif
626 };
627
628 #ifdef STATISTICS
629
630 #ifdef STAT_CALLS
631 #define CSTAT(x) STAT(call_ ## x)
632 #else
633 #define CSTAT(x)
634 #endif
635
636 #define STAT(x) (_statistics->x++)
637 #define INC_STAT(x,y) (_statistics->x += (y))
638 #define GET_STAT(x) (_statistics->x)
639 #define SET_STAT(x, y) (_statistics->x = (y))
640 #else
641 #define CSTAT(x)
642 #define STAT(x)
643 #define INC_STAT(x,y)
644 #define GET_STAT(x) 0
645 #define SET_STAT(x, y)
646 #endif
647
648 #ifndef IFNAMSIZ
649 # define IFNAMSIZ 16
650 #endif
651
652 typedef struct
653 {
654 int debug; // debugging level
655 time_t start_time; // time when l2tpns was started
656 char bandwidth[256]; // current bandwidth
657 char pid_file[256]; // file to write PID to on startup
658 int wrote_pid;
659 clockt current_time; // 1/10ths of a second since the process started.
660 // means that we can only run a given process
661 // for 13 years without re-starting!
662
663 char config_file[128];
664 int reload_config; // flag to re-read config (set by cli)
665 int multi_read_count; // amount of packets to read per fd in processing loop
666
667 char tundevicename[IFNAMSIZ]; // tun device name
668 char log_filename[128];
669
670 char l2tp_secret[64]; // L2TP shared secret
671 int l2tp_mtu; // MTU of interface used for L2TP
672
673 char random_device[256]; // random device path, defaults to RANDOMDEVICE
674
675 int ppp_restart_time; // timeout for PPP restart
676 int ppp_max_configure; // max lcp configure requests to send
677 int ppp_max_failure; // max lcp configure naks to send
678
679 char radiussecret[64];
680 int radius_accounting;
681 int radius_interim;
682 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
683 uint16_t radiusport[MAXRADSERVER]; // radius base ports
684 uint8_t numradiusservers; // radius server count
685
686 uint16_t radius_dae_port; // port for radius DAE
687 uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
688 uint16_t radius_bind_max;
689
690 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
691 int radius_authtypes;
692 int radius_authprefer;
693
694 int allow_duplicate_users; // allow multiple logins with the same username
695 int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
696
697 in_addr_t default_dns1, default_dns2;
698
699 unsigned long rl_rate; // default throttle rate
700 int num_tbfs; // number of throttle buckets
701
702 char accounting_dir[128];
703 in_addr_t bind_address;
704 in_addr_t peer_address;
705 int send_garp; // Set to true to garp for vip address on startup
706
707 int dump_speed;
708 char plugins[64][MAXPLUGINS];
709 char old_plugins[64][MAXPLUGINS];
710
711 int next_tbf; // Next HTB id available to use
712 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
713 // policy for this process.
714 int lock_pages; // Lock pages into memory.
715 int icmp_rate; // Max number of ICMP unreachable per second to send
716 int max_packets; // DoS prevention: per session limit of packets/0.1s
717 char epdis_addr[20]; // MP Endpoint Discriminator address
718
719 in_addr_t cluster_address; // Multicast address of cluster.
720 // Send to this address to have everyone hear.
721 char cluster_interface[64]; // Which interface to listen for multicast on.
722 int cluster_iam_master; // Are we the cluster master???
723 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
724 in_addr_t cluster_master_address; // The network address of the cluster master.
725 // Zero if i am the cluster master.
726 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
727 // (or the seq number we're next expecting if we're a slave).
728 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
729 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
730 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
731 int cluster_highest_sessionid;
732 int cluster_highest_bundleid;
733 int cluster_highest_tunnelid;
734 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
735 int cluster_last_hb_ver; // Heartbeat version last seen from master
736 int cluster_num_changes; // Number of changes queued.
737
738 int cluster_mcast_ttl; // TTL for multicast packets
739 int cluster_hb_interval; // How often to send a heartbeat.
740 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
741 uint64_t cluster_table_version; // # state changes processed by cluster
742
743 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
744
745
746 int cluster_master_min_adv; // Master advertises routes while the number of up to date
747 // slaves is less than this value.
748 in_addr_t cli_bind_address; // bind address for CLI
749 char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
750 // Guest change
751 char guest_user[MAXUSER]; // Guest account username
752
753 #ifdef BGP
754 #define BGP_NUM_PEERS 2
755 uint16_t as_number;
756 struct {
757 char name[64];
758 uint16_t as;
759 int keepalive;
760 int hold;
761 struct in_addr update_source;
762 } neighbour[BGP_NUM_PEERS];
763 in_addr_t nexthop_address;
764 struct in6_addr nexthop6_address;
765 #endif
766
767 int echo_timeout; // Time between last packet sent and LCP ECHO generation
768 int idle_echo_timeout; // Time between last packet seen and
769 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
770 in_addr_t iftun_address;
771 #ifdef LAC
772 int disable_lac_func;
773 int auth_tunnel_change_addr_src;
774 int highest_rlnsid;
775 uint16_t bind_portremotelns;
776 in_addr_t bind_address_remotelns;
777 #endif
778 char pppoe_if_to_bind[IFNAMSIZ]; // Name pppoe interface to bind
779 char pppoe_service_name[64]; // pppoe service name
780 char pppoe_ac_name[64];
781 uint8_t pppoe_hwaddr[ETH_ALEN]; // MAC addr of interface pppoe to bind
782 int disable_sending_hello; // Disable l2tp sending HELLO message for Apple compatibility.
783 } configt;
784
785 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
786 typedef struct
787 {
788 char *key;
789 int offset;
790 int size;
791 enum config_typet type;
792 } config_descriptt;
793
794 typedef struct
795 {
796 uint8_t op; // operation
797 #define FILTER_PORT_OP_NONE 0 // all ports match
798 #define FILTER_PORT_OP_EQ 1
799 #define FILTER_PORT_OP_NEQ 2
800 #define FILTER_PORT_OP_GT 3
801 #define FILTER_PORT_OP_LT 4
802 #define FILTER_PORT_OP_RANGE 5
803 uint16_t port; // port (host byte order)
804 uint16_t port2; // range
805 } ip_filter_portt;
806
807 typedef struct
808 {
809 int action; // permit/deny
810 #define FILTER_ACTION_DENY 1
811 #define FILTER_ACTION_PERMIT 2
812 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
813 in_addr_t src_ip; // source ip (network byte order)
814 in_addr_t src_wild;
815 ip_filter_portt src_ports;
816 in_addr_t dst_ip; // dest ip
817 in_addr_t dst_wild;
818 ip_filter_portt dst_ports;
819 uint8_t frag; // apply to non-initial fragments
820 uint8_t tcp_flag_op; // match type: any, all, established
821 #define FILTER_FLAG_OP_ANY 1
822 #define FILTER_FLAG_OP_ALL 2
823 #define FILTER_FLAG_OP_EST 3
824 uint8_t tcp_sflags; // flags set
825 uint8_t tcp_cflags; // flags clear
826 uint32_t counter; // match count
827 } ip_filter_rulet;
828
829 #define TCP_FLAG_FIN 0x01
830 #define TCP_FLAG_SYN 0x02
831 #define TCP_FLAG_RST 0x04
832 #define TCP_FLAG_PSH 0x08
833 #define TCP_FLAG_ACK 0x10
834 #define TCP_FLAG_URG 0x20
835
836 #define MAXFILTER 32
837 #define MAXFILTER_RULES 32
838 typedef struct
839 {
840 char name[32]; // ACL name
841 int extended; // type: 0 = standard, 1 = extended
842 ip_filter_rulet rules[MAXFILTER_RULES];
843 int used; // session ref count
844 } ip_filtert;
845
846 // CDN result/error codes
847 #define CDN_NONE 0, 0
848 #define CDN_TRY_ANOTHER 2, 7
849 #define CDN_ADMIN_DISC 3, 0
850 #define CDN_UNAVAILABLE 4, 0
851
852 // RADIUS Acct-Terminate-Cause values
853 #define TERM_USER_REQUEST 1
854 #define TERM_LOST_CARRIER 2
855 #define TERM_LOST_SERVICE 3
856 #define TERM_IDLE_TIMEOUT 4
857 #define TERM_SESSION_TIMEOUT 5
858 #define TERM_ADMIN_RESET 6
859 #define TERM_ADMIN_REBOOT 7
860 #define TERM_PORT_ERROR 8
861 #define TERM_NAS_ERROR 9
862 #define TERM_NAS_REQUEST 10
863 #define TERM_NAS_REBOOT 11
864 #define TERM_PORT_UNNEEDED 12
865 #define TERM_PORT_PREEMPTED 13
866 #define TERM_PORT_SUSPENDED 14
867 #define TERM_SERVICE_UNAVAILABLE 15
868 #define TERM_CALLBACK 16
869 #define TERM_USER_ERROR 17
870 #define TERM_HOST_REQUEST 18
871 #define TERM_SUPPLICANT_RESTART 19
872 #define TERM_REAUTHENTICATION_FAILURE 20
873 #define TERM_PORT_REINIT 21
874 #define TERM_PORT_DISABLED 22
875
876 // on slaves, alow BGP to withdraw cleanly before exiting
877 #define QUIT_DELAY 5
878
879 // quit actions (master)
880 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
881 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
882
883 // arp.c
884 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
885
886
887 // ppp.c
888 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
889 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
890 void lcp_open(sessionidt s, tunnelidt t);
891 void lcp_restart(sessionidt s);
892 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
893 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
894 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
895 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
896 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
897 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
898 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
899 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
900 void sendchap(sessionidt s, tunnelidt t);
901 uint8_t *makeppp(uint8_t *b, int size, uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
902 uint8_t *opt_makeppp(uint8_t *p, int l, sessionidt s, tunnelidt t, uint16_t mtype, uint8_t prio, bundleidt bid, uint8_t mp_bits);
903 void sendlcp(sessionidt s, tunnelidt t);
904 void send_ipin(sessionidt s, uint8_t *buf, int len);
905 void sendccp(sessionidt s, tunnelidt t);
906 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
907 int join_bundle(sessionidt s);
908
909
910 // radius.c
911 void initrad(void);
912 void radiussend(uint16_t r, uint8_t state);
913 void processrad(uint8_t *buf, int len, char socket_index);
914 void radiusretry(uint16_t r);
915 uint16_t radiusnew(sessionidt s);
916 void radiusclear(uint16_t r, sessionidt s);
917 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
918 #ifdef LAC
919 int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, const char *radiussecret, const uint8_t * auth);
920 #endif
921
922 // l2tpns.c
923 clockt backoff(uint8_t try);
924 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
925 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
926 sessionidt sessionbyip(in_addr_t ip);
927 sessionidt sessionbyipv6(struct in6_addr ip);
928 sessionidt sessionbyuser(char *username);
929 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
930 void random_data(uint8_t *buf, int len);
931 void sessionkill(sessionidt s, char *reason);
932 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
933 void filter_session(sessionidt s, int filter_in, int filter_out);
934 void send_garp(in_addr_t ip);
935 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
936 int tun_write(uint8_t *data, int size);
937 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
938 void sendipcp(sessionidt s, tunnelidt t);
939 void sendipv6cp(sessionidt s, tunnelidt t);
940 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
941 void processipout(uint8_t *buf, int len);
942 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
943 int find_filter(char const *name, size_t len);
944 int ip_filter(uint8_t *buf, int len, uint8_t filter);
945 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
946 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
947 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
948 #ifdef LAC
949 tunnelidt lac_new_tunnel();
950 void lac_tunnelclear(tunnelidt t);
951 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len);
952 void lac_send_ICRQ(tunnelidt t, sessionidt s);
953 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg);
954 #endif
955
956 #undef LOG
957 #undef LOG_HEX
958 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
959 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
960
961 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
962 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
963
964
965 int sessionsetup(sessionidt s, tunnelidt t);
966 int run_plugins(int plugin_type, void *data);
967 void rebuild_address_pool(void);
968 void throttle_session(sessionidt s, int rate_in, int rate_out);
969 int load_session(sessionidt, sessiont *);
970 void become_master(void); // We're the master; kick off any required master initializations.
971
972
973 // cli.c
974 void init_cli();
975 void cli_init_complete(char *hostname);
976 void cli_do_file(FILE *fh);
977 void cli_do(int sockfd);
978 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
979
980
981 // icmp.c
982 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
983
984
985 extern tunnelt *tunnel;
986 extern bundlet *bundle;
987 extern sessiont *session;
988 extern sessionlocalt *sess_local;
989 extern ippoolt *ip_address_pool;
990 #define sessionfree (session[0].next)
991
992
993 extern configt *config;
994 extern time_t basetime; // Time when this process started.
995 extern time_t time_now; // Seconds since EPOCH.
996 extern char main_quit;
997 extern uint32_t last_id;
998 extern struct Tstats *_statistics;
999 extern in_addr_t my_address;
1000 extern int clifd;
1001 extern int epollfd;
1002
1003 struct event_data {
1004 enum {
1005 FD_TYPE_CLI,
1006 FD_TYPE_CLUSTER,
1007 FD_TYPE_TUN,
1008 FD_TYPE_UDP,
1009 FD_TYPE_CONTROL,
1010 FD_TYPE_DAE,
1011 FD_TYPE_RADIUS,
1012 FD_TYPE_BGP,
1013 FD_TYPE_NETLINK,
1014 #ifdef LAC
1015 FD_TYPE_UDPLAC,
1016 #endif
1017 FD_TYPE_PPPOEDISC,
1018 FD_TYPE_PPPOESESS
1019 } type;
1020 int index; // for RADIUS, BGP
1021 };
1022
1023 #define TIME (config->current_time)
1024
1025 extern uint16_t MRU;
1026 extern uint16_t MSS;
1027
1028 // macros for handling help in cli commands
1029 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
1030 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
1031
1032 #endif /* __L2TPNS_H__ */