73b545563805137813f807c7840567b47c30a996
[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 (MAXFRAGNUM - 1) // Must be equal to MAXFRAGNUM-1
68
69 // Multi bind address constants
70 #define MAX_UDPFD 4
71 #define MAX_BINDADDR MAX_UDPFD
72 // + 1 for the LAC Hostname
73 #define MAX_NBHOSTNAME (MAX_UDPFD + 1)
74 // 4 + 1 for the udplac
75 #define INIT_TABUDPFD {-1, -1, -1, -1, -1}
76 #define INIT_TABUDPVAR {0, 0, 0, 0, 0}
77
78 // Constants
79 #ifndef ETCDIR
80 #define ETCDIR "/etc/l2tpns"
81 #endif
82
83 #ifndef LIBDIR
84 #define LIBDIR "/usr/lib/l2tpns"
85 #endif
86
87 #ifndef PLUGINDIR
88 #define PLUGINDIR LIBDIR // Plugins
89 #endif
90
91 #ifndef PLUGINCONF
92 #define PLUGINCONF ETCDIR // Plugin config dir
93 #endif
94
95 #ifndef FLASHDIR
96 #define FLASHDIR ETCDIR
97 #endif
98
99 #define TUNDEVICE "/dev/net/tun"
100 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
101 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
102 #define CLIUSERS FLASHDIR "/users" // CLI Users file
103 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
104 #define ACCT_TIME 3000 // 5 minute accounting interval
105 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
106 #define L2TPPORT 1701 // L2TP port
107 #define RADPORT 1645 // old radius port...
108 #define DAEPORT 3799 // DAE port
109 #define PKTARP 0x0806 // ARP packet type
110 #define PKTIP 0x0800 // IPv4 packet type
111 #define PKTIPV6 0x86DD // IPv6 packet type
112 #define PPPPAP 0xC023
113 #define PPPCHAP 0xC223
114 #define PPPLCP 0xC021
115 #define PPPIPCP 0x8021
116 #define PPPIPV6CP 0x8057
117 #define PPPCCP 0x80FD
118 #define PPPIP 0x0021
119 #define PPPIPV6 0x0057
120 #define PPPMP 0x003D
121 #define MIN_IP_SIZE 0x19
122
123 enum {
124 ConfigReq = 1,
125 ConfigAck,
126 ConfigNak,
127 ConfigRej,
128 TerminateReq,
129 TerminateAck,
130 CodeRej,
131 ProtocolRej,
132 EchoReq,
133 EchoReply,
134 DiscardRequest,
135 IdentRequest
136 };
137
138 enum {
139 AccessRequest = 1,
140 AccessAccept,
141 AccessReject,
142 AccountingRequest,
143 AccountingResponse,
144 AccessChallenge = 11,
145 DisconnectRequest = 40,
146 DisconnectACK,
147 DisconnectNAK,
148 CoARequest,
149 CoAACK,
150 CoANAK
151 };
152
153 // PPP phases
154 enum {
155 Dead,
156 Establish,
157 Authenticate,
158 Network,
159 Terminate
160 };
161
162 // PPP states
163 enum {
164 Initial,
165 Starting,
166 Closed,
167 Stopped,
168 Closing,
169 Stopping,
170 RequestSent,
171 AckReceived,
172 AckSent,
173 Opened
174 };
175
176 // reset state machine counters
177 #define initialise_restart_count(_s, _fsm) \
178 sess_local[_s]._fsm.conf_sent = \
179 sess_local[_s]._fsm.nak_sent = 0
180
181 // no more attempts
182 #define zero_restart_count(_s, _fsm) ({ \
183 sess_local[_s]._fsm.conf_sent = \
184 config->ppp_max_configure; \
185 sess_local[_s]._fsm.restart = \
186 time_now + config->ppp_restart_time; \
187 })
188
189 // increment ConfReq counter and reset timer
190 #define restart_timer(_s, _fsm) ({ \
191 sess_local[_s]._fsm.conf_sent++; \
192 sess_local[_s]._fsm.restart = \
193 time_now + config->ppp_restart_time; \
194 })
195
196 // stop timer on change to state where timer does not run
197 #define change_state(_s, _fsm, _new) ({ \
198 if (_new != session[_s].ppp._fsm) \
199 { \
200 switch (_new) \
201 { \
202 case Initial: \
203 case Starting: \
204 case Closed: \
205 case Stopped: \
206 case Opened: \
207 sess_local[_s]._fsm.restart = 0; \
208 initialise_restart_count(_s, _fsm); \
209 } \
210 session[_s].ppp._fsm = _new; \
211 cluster_send_session(_s); \
212 } \
213 })
214
215 // Types
216 typedef uint16_t sessionidt;
217 typedef uint16_t bundleidt;
218 typedef uint16_t tunnelidt;
219 typedef uint32_t clockt;
220 typedef uint8_t hasht[16];
221
222 // CLI actions
223 struct cli_session_actions {
224 char action;
225 in_addr_t snoop_ip;
226 uint16_t snoop_port;
227 int throttle_in;
228 int throttle_out;
229 int filter_in;
230 int filter_out;
231 };
232
233 #define CLI_SESS_KILL 0x01
234 #define CLI_SESS_SNOOP 0x02
235 #define CLI_SESS_NOSNOOP 0x04
236 #define CLI_SESS_THROTTLE 0x08
237 #define CLI_SESS_NOTHROTTLE 0x10
238 #define CLI_SESS_FILTER 0x20
239 #define CLI_SESS_NOFILTER 0x40
240
241 struct cli_tunnel_actions {
242 char action;
243 };
244
245 #define CLI_TUN_KILL 0x01
246
247 // structures
248 typedef struct // route
249 {
250 in_addr_t ip;
251 int prefixlen;
252 }
253 routet;
254
255 typedef struct controls // control message
256 {
257 struct controls *next; // next in queue
258 uint16_t length; // length
259 uint8_t buf[MAXCONTROL];
260 }
261 controlt;
262
263 typedef struct {
264 uint8_t length; // Endpoint Discriminator length
265 uint8_t addr_class; // Endpoint Discriminator class
266 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
267 } epdist;
268
269 typedef struct {
270 sessionidt sid; // Fragment originating session
271 tunnelidt tid; // Fragment originating tunnel
272 uint8_t flags; // MP frame flags
273 uint32_t seq; // fragment seq num
274 uint32_t jitteravg;
275 uint16_t length; // Fragment length
276 uint8_t data[MAXFRAGLEN]; // Fragment data
277 } fragmentt;
278
279 typedef struct
280 {
281 sessionidt next; // next session in linked list
282 sessionidt far; // far end session ID
283 tunnelidt tunnel; // near end tunnel ID
284 uint8_t flags; // session flags: see SESSION_*
285 struct {
286 uint8_t phase; // PPP phase
287 uint8_t lcp:4; // LCP state
288 uint8_t ipcp:4; // IPCP state
289 uint8_t ipv6cp:4; // IPV6CP state
290 uint8_t ccp:4; // CCP state
291 } ppp;
292 uint16_t mru; // maximum receive unit
293 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
294 int ip_pool_index; // index to IP pool
295 uint32_t unique_id; // unique session id
296 uint32_t magic; // ppp magic number
297 uint32_t pin, pout; // packet counts
298 uint32_t cin, cout; // byte counts
299 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
300 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
301 uint16_t throttle_in; // upstream throttle rate (kbps)
302 uint16_t throttle_out; // downstream throttle rate
303 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
304 uint8_t filter_out; // output filter index
305 uint16_t snoop_port; // Interception destination port
306 in_addr_t snoop_ip; // Interception destination IP
307 clockt opened; // when started
308 clockt die; // being closed, when to finally free
309 uint32_t session_timeout; // Maximum session time in seconds
310 uint32_t idle_timeout; // Maximum idle time in seconds
311 time_t last_packet; // Last packet from the user (used for idle timeouts)
312 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
313 in_addr_t dns1, dns2; // DNS servers
314 routet route[MAXROUTE]; // static routes
315 uint16_t tbf_in; // filter bucket for throttling in from the user.
316 uint16_t tbf_out; // filter bucket for throttling out to the user.
317 int random_vector_length;
318 uint8_t random_vector[MAXTEL];
319 char user[MAXUSER]; // user (needed in session for radius stop messages)
320 char called[MAXTEL]; // called number
321 char calling[MAXTEL]; // calling number
322 uint32_t tx_connect_speed;
323 uint32_t rx_connect_speed;
324 clockt timeout; // Session timeout
325 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
326 epdist epdis; // Multilink Endpoint Discriminator
327 bundleidt bundle; // Multilink Bundle Identifier
328 uint8_t mssf; // Multilink Short Sequence Number Header Format
329 uint8_t walled_garden; // is this session gardened?
330 uint8_t classlen; // class (needed for radius accounting messages)
331 char class[MAXCLASS];
332 uint8_t ipv6prefixlen; // IPv6 route prefix length
333 struct in6_addr ipv6route; // Static IPv6 route
334 sessionidt forwardtosession; // LNS id_session to forward
335 uint8_t src_hwaddr[ETH_ALEN]; // MAC addr source (for pppoe sessions 6 bytes)
336 char reserved[4]; // Space to expand structure without changing HB_VERSION
337 }
338 sessiont;
339
340 typedef struct
341 {
342 int state; // current state (bundlestate enum)
343 uint32_t seq_num_t; // Sequence Number (transmission)
344 uint32_t timeout; // Session-Timeout for bundle
345 uint32_t max_seq; // Max value of sequence number field
346 uint8_t num_of_links; // Number of links joint to this bundle
347 uint32_t online_time; // The time this bundle is online
348 clockt last_check; // Last time the timeout is checked
349 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
350 uint8_t mssf; // Multilink Short Sequence Number Header Format
351 epdist epdis; // Multilink Endpoint Discriminator
352 char user[MAXUSER]; // Needed for matching member links
353 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
354 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
355 }
356 bundlet;
357
358 typedef struct
359 {
360 fragmentt fragment[MAXFRAGNUM];
361 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
362 uint16_t re_frame_len; // The reassembled frame length
363 uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
364 uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
365 uint32_t M; // Minumum frame sequence number received over all bundle members
366 uint32_t start_seq; // Last received frame sequence number (bearing B bit)
367 }
368 fragmentationt;
369
370 #define AUTHPAP 1 // allow PAP
371 #define AUTHCHAP 2 // allow CHAP
372
373 typedef struct
374 {
375 // packet counters
376 uint32_t pin;
377 uint32_t pout;
378
379 // byte counters
380 uint32_t cin;
381 uint32_t cout;
382
383 // PPP restart timer/counters
384 struct {
385 time_t restart;
386 int conf_sent;
387 int nak_sent;
388 } lcp, ipcp, ipv6cp, ccp;
389
390 // identifier for Protocol-Reject, Code-Reject
391 uint8_t lcp_ident;
392
393 // authentication to use
394 int lcp_authtype;
395
396 // our MRU
397 uint16_t ppp_mru;
398
399 // our MRRU
400 uint16_t mp_mrru;
401
402 // our mssf
403 uint16_t mp_mssf;
404
405 // our Endpoint Discriminator
406 in_addr_t mp_epdis;
407
408 // DoS prevention
409 clockt last_packet_out;
410 uint32_t packets_out;
411 uint32_t packets_dropped;
412
413 // RADIUS session in use
414 uint16_t radius;
415
416 // interim RADIUS
417 time_t last_interim;
418
419 // last LCP Echo
420 time_t last_echo;
421
422 // Last Multilink frame sequence number received
423 uint32_t last_seq;
424
425 // jitter average of the session
426 uint32_t jitteravg;
427 // time in milliseconds of the last fragment.
428 uint64_t prev_time;
429 } sessionlocalt;
430
431 // session flags
432 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
433 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
434 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
435
436 // 328 bytes per tunnel
437 typedef struct
438 {
439 tunnelidt far; // far end tunnel ID
440 in_addr_t ip; // Ip for far end
441 uint16_t port; // port for far end
442 uint16_t window; // Rx window
443 uint16_t nr; // next receive
444 uint16_t ns; // next send
445 int state; // current state (tunnelstate enum)
446 clockt last; // when last control message sent (used for resend timeout)
447 clockt retry; // when to try resending pending control
448 clockt die; // being closed, when to finally free
449 clockt lastrec; // when the last control message was received
450 char hostname[128]; // tunnel hostname
451 char vendor[128]; // LAC vendor
452 uint8_t try; // number of retrys on a control message
453 uint16_t controlc; // outstaind messages in queue
454 controlt *controls; // oldest message
455 controlt *controle; // newest message
456 uint16_t isremotelns; // != 0 if the tunnel is to remote LNS (== index on the conf remote lns)
457 uint16_t indexudp; // Index UDP file handle (in udpfd[])
458 char reserved[12]; // Space to expand structure without changing HB_VERSION
459 }
460 tunnelt;
461
462 // 164 bytes per radius session
463 typedef struct // outstanding RADIUS requests
464 {
465 sessionidt session; // which session this applies to
466 hasht auth; // request authenticator
467 clockt retry; // when to try next
468 char pass[129]; // password
469 uint8_t id; // ID for PPP response
470 uint8_t try; // which try we are on
471 uint8_t state; // state of radius requests
472 uint8_t chap; // set if CHAP used (is CHAP identifier)
473 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
474 char const *term_msg; // terminate reason
475 }
476 radiust;
477
478 typedef struct
479 {
480 in_addr_t address; // Host byte order..
481 char assigned; // 1 if assigned, 0 if free
482 sessionidt session;
483 clockt last; // last used
484 char user[129]; // user (try to have ip addresses persistent)
485 }
486 ippoolt;
487
488 #ifdef RINGBUFFER
489 struct Tringbuffer
490 {
491 struct {
492 char level;
493 sessionidt session;
494 tunnelidt tunnel;
495 char message[MAX_LOG_LENGTH];
496 } buffer[RINGBUFFER_SIZE];
497 int head;
498 int tail;
499 };
500 #endif
501
502 /*
503 * Possible tunnel states
504 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
505 */
506 enum
507 {
508 TUNNELFREE, // Not in use
509 TUNNELOPEN, // Active tunnel
510 TUNNELDIE, // Currently closing
511 TUNNELOPENING, // Busy opening
512 TUNNELUNDEF, // Undefined
513 };
514
515 enum
516 {
517 BUNDLEFREE, // Not in use
518 BUNDLEOPEN, // Active bundle
519 BUNDLEUNDEF, // Undefined
520 };
521
522 enum
523 {
524 NULLCLASS = 0, //End Point Discriminator classes
525 LOCALADDR,
526 IPADDR,
527 IEEEMACADDR,
528 PPPMAGIC,
529 PSNDN,
530 };
531
532 enum
533 {
534 RADIUSNULL, // Not in use
535 RADIUSCHAP, // sending CHAP down PPP
536 RADIUSAUTH, // sending auth to RADIUS server
537 RADIUSSTART, // sending start accounting to RADIUS server
538 RADIUSSTOP, // sending stop accounting to RADIUS server
539 RADIUSINTERIM, // sending interim accounting to RADIUS server
540 RADIUSWAIT, // waiting timeout before available, in case delayed replies
541 RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
542 };
543
544 struct Tstats
545 {
546 time_t start_time;
547 time_t last_reset;
548
549 uint32_t tun_rx_packets;
550 uint32_t tun_tx_packets;
551 uint32_t tun_rx_bytes;
552 uint32_t tun_tx_bytes;
553 uint32_t tun_rx_errors;
554 uint32_t tun_tx_errors;
555 uint32_t tun_rx_dropped;
556
557 uint32_t tunnel_rx_packets;
558 uint32_t tunnel_tx_packets;
559 uint32_t tunnel_rx_bytes;
560 uint32_t tunnel_tx_bytes;
561 uint32_t tunnel_rx_errors;
562 uint32_t tunnel_tx_errors;
563
564 uint32_t tunnel_retries;
565 uint32_t radius_retries;
566
567 uint32_t arp_sent;
568
569 uint32_t packets_snooped;
570
571 uint32_t tunnel_created;
572 uint32_t session_created;
573 uint32_t tunnel_timeout;
574 uint32_t session_timeout;
575 uint32_t radius_timeout;
576 uint32_t radius_overflow;
577 uint32_t tunnel_overflow;
578 uint32_t session_overflow;
579
580 uint32_t ip_allocated;
581 uint32_t ip_freed;
582
583 uint32_t c_forwarded;
584 uint32_t recv_forward;
585
586 uint32_t select_called;
587 uint32_t multi_read_used;
588 uint32_t multi_read_exceeded;
589
590 #ifdef STATISTICS
591 uint32_t call_processtun;
592 uint32_t call_processipout;
593 uint32_t call_processipv6out;
594 uint32_t call_processudp;
595 uint32_t call_sessionbyip;
596 uint32_t call_sessionbyipv6;
597 uint32_t call_sessionbyuser;
598 uint32_t call_sendarp;
599 uint32_t call_sendipcp;
600 uint32_t call_sendipv6cp;
601 uint32_t call_processipv6cp;
602 uint32_t call_tunnelsend;
603 uint32_t call_sessionkill;
604 uint32_t call_sessionshutdown;
605 uint32_t call_tunnelkill;
606 uint32_t call_tunnelshutdown;
607 uint32_t call_assign_ip_address;
608 uint32_t call_free_ip_address;
609 uint32_t call_dump_acct_info;
610 uint32_t call_sessionsetup;
611 uint32_t call_processpap;
612 uint32_t call_processchap;
613 uint32_t call_processlcp;
614 uint32_t call_processipcp;
615 uint32_t call_processipin;
616 uint32_t call_processipv6in;
617 uint32_t call_processccp;
618 uint32_t call_sendchap;
619 uint32_t call_processrad;
620 uint32_t call_radiussend;
621 uint32_t call_radiusretry;
622 uint32_t call_random_data;
623 #endif
624 };
625
626 #ifdef STATISTICS
627
628 #ifdef STAT_CALLS
629 #define CSTAT(x) STAT(call_ ## x)
630 #else
631 #define CSTAT(x)
632 #endif
633
634 #define STAT(x) (_statistics->x++)
635 #define INC_STAT(x,y) (_statistics->x += (y))
636 #define GET_STAT(x) (_statistics->x)
637 #define SET_STAT(x, y) (_statistics->x = (y))
638 #else
639 #define CSTAT(x)
640 #define STAT(x)
641 #define INC_STAT(x,y)
642 #define GET_STAT(x) 0
643 #define SET_STAT(x, y)
644 #endif
645
646 #ifndef IFNAMSIZ
647 # define IFNAMSIZ 16
648 #endif
649
650 typedef struct
651 {
652 int debug; // debugging level
653 time_t start_time; // time when l2tpns was started
654 char bandwidth[256]; // current bandwidth
655 char pid_file[256]; // file to write PID to on startup
656 int wrote_pid;
657 clockt current_time; // 1/10ths of a second since the process started.
658 // means that we can only run a given process
659 // for 13 years without re-starting!
660
661 char config_file[128];
662 int reload_config; // flag to re-read config (set by cli)
663 int multi_read_count; // amount of packets to read per fd in processing loop
664
665 char tundevicename[IFNAMSIZ]; // tun device name
666 char log_filename[128];
667
668 char l2tp_secret[64]; // L2TP shared secret
669 int l2tp_mtu; // MTU of interface used for L2TP
670
671 char random_device[256]; // random device path, defaults to RANDOMDEVICE
672
673 int ppp_restart_time; // timeout for PPP restart
674 int ppp_max_configure; // max lcp configure requests to send
675 int ppp_max_failure; // max lcp configure naks to send
676
677 char radiussecret[64];
678 int radius_accounting;
679 int radius_interim;
680 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
681 uint16_t radiusport[MAXRADSERVER]; // radius base ports
682 uint8_t numradiusservers; // radius server count
683
684 uint16_t radius_dae_port; // port for radius DAE
685 uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
686 uint16_t radius_bind_max;
687
688 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
689 int radius_authtypes;
690 int radius_authprefer;
691
692 int allow_duplicate_users; // allow multiple logins with the same username
693 int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
694
695 in_addr_t default_dns1, default_dns2;
696
697 unsigned long rl_rate; // default throttle rate
698 int num_tbfs; // number of throttle buckets
699
700 char accounting_dir[128];
701 int account_all_origin; // Accouting all origin (LAC data + Remote LNS Data + PPPOE data)
702 in_addr_t bind_address;
703 in_addr_t peer_address;
704 int send_garp; // Set to true to garp for vip address on startup
705
706 int dump_speed;
707 char plugins[64][MAXPLUGINS];
708 char old_plugins[64][MAXPLUGINS];
709
710 int next_tbf; // Next HTB id available to use
711 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
712 // policy for this process.
713 int lock_pages; // Lock pages into memory.
714 int icmp_rate; // Max number of ICMP unreachable per second to send
715 int max_packets; // DoS prevention: per session limit of packets/0.1s
716 char epdis_addr[20]; // MP Endpoint Discriminator address
717
718 in_addr_t cluster_address; // Multicast address of cluster.
719 // Send to this address to have everyone hear.
720 char cluster_interface[64]; // Which interface to listen for multicast on.
721 int cluster_iam_master; // Are we the cluster master???
722 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
723 in_addr_t cluster_master_address; // The network address of the cluster master.
724 // Zero if i am the cluster master.
725 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
726 // (or the seq number we're next expecting if we're a slave).
727 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
728 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
729 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
730 int cluster_highest_sessionid;
731 int cluster_highest_bundleid;
732 int cluster_highest_tunnelid;
733 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
734 int cluster_last_hb_ver; // Heartbeat version last seen from master
735 int cluster_num_changes; // Number of changes queued.
736
737 int cluster_mcast_ttl; // TTL for multicast packets
738 int cluster_hb_interval; // How often to send a heartbeat.
739 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
740 uint64_t cluster_table_version; // # state changes processed by cluster
741
742 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
743
744
745 int cluster_master_min_adv; // Master advertises routes while the number of up to date
746 // slaves is less than this value.
747 in_addr_t cli_bind_address; // bind address for CLI
748 char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
749 // Guest change
750 char guest_user[MAXUSER]; // Guest account username
751
752 #ifdef BGP
753 #define BGP_NUM_PEERS 2
754 uint16_t as_number;
755 struct {
756 char name[64];
757 uint16_t as;
758 int keepalive;
759 int hold;
760 struct in_addr update_source;
761 } neighbour[BGP_NUM_PEERS];
762 in_addr_t nexthop_address;
763 struct in6_addr nexthop6_address;
764 #endif
765
766 int echo_timeout; // Time between last packet sent and LCP ECHO generation
767 int idle_echo_timeout; // Time between last packet seen and
768 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
769 in_addr_t iftun_address;
770 int disable_lac_func;
771 int auth_tunnel_change_addr_src;
772 int highest_rlnsid;
773 uint16_t bind_portremotelns;
774 in_addr_t bind_address_remotelns;
775 char pppoe_if_to_bind[IFNAMSIZ]; // Name pppoe interface to bind
776 char pppoe_service_name[64]; // pppoe service name
777 char pppoe_ac_name[64];
778 uint8_t pppoe_hwaddr[ETH_ALEN]; // MAC addr of interface pppoe to bind
779 int pppoe_only_equal_svc_name; // Accept only PADI with service-name equal to server
780 int disable_sending_hello; // Disable l2tp sending HELLO message for Apple compatibility.
781 int disable_no_spoof; // Disable no spoof (permit load balancing client --> internet)
782 int nbudpfd; // number UDP file handle
783 int nbmultiaddress; // number multi address to bind
784 int indexlacudpfd; // Index UDP LAC file handle (in udpfd[])
785 int nbmultihostname; // number hostname, normally the same number as the nbudpfd
786 int no_throttle_local_IP; // no throttle traffic from session to session
787 in_addr_t bind_n_address[MAX_BINDADDR];
788 in_addr_t iftun_n_address[MAX_BINDADDR];
789 char bind_multi_address[256];
790 char multi_hostname[512];
791 char multi_n_hostname[MAX_NBHOSTNAME][MAXHOSTNAME]; // list hostname
792 } configt;
793
794 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
795 typedef struct
796 {
797 char *key;
798 int offset;
799 int size;
800 enum config_typet type;
801 } config_descriptt;
802
803 typedef struct
804 {
805 uint8_t op; // operation
806 #define FILTER_PORT_OP_NONE 0 // all ports match
807 #define FILTER_PORT_OP_EQ 1
808 #define FILTER_PORT_OP_NEQ 2
809 #define FILTER_PORT_OP_GT 3
810 #define FILTER_PORT_OP_LT 4
811 #define FILTER_PORT_OP_RANGE 5
812 uint16_t port; // port (host byte order)
813 uint16_t port2; // range
814 } ip_filter_portt;
815
816 typedef struct
817 {
818 int action; // permit/deny
819 #define FILTER_ACTION_DENY 1
820 #define FILTER_ACTION_PERMIT 2
821 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
822 in_addr_t src_ip; // source ip (network byte order)
823 in_addr_t src_wild;
824 ip_filter_portt src_ports;
825 in_addr_t dst_ip; // dest ip
826 in_addr_t dst_wild;
827 ip_filter_portt dst_ports;
828 uint8_t frag; // apply to non-initial fragments
829 uint8_t tcp_flag_op; // match type: any, all, established
830 #define FILTER_FLAG_OP_ANY 1
831 #define FILTER_FLAG_OP_ALL 2
832 #define FILTER_FLAG_OP_EST 3
833 uint8_t tcp_sflags; // flags set
834 uint8_t tcp_cflags; // flags clear
835 uint32_t counter; // match count
836 } ip_filter_rulet;
837
838 #define TCP_FLAG_FIN 0x01
839 #define TCP_FLAG_SYN 0x02
840 #define TCP_FLAG_RST 0x04
841 #define TCP_FLAG_PSH 0x08
842 #define TCP_FLAG_ACK 0x10
843 #define TCP_FLAG_URG 0x20
844
845 #define MAXFILTER 32
846 #define MAXFILTER_RULES 32
847 typedef struct
848 {
849 char name[32]; // ACL name
850 int extended; // type: 0 = standard, 1 = extended
851 ip_filter_rulet rules[MAXFILTER_RULES];
852 int used; // session ref count
853 } ip_filtert;
854
855 // CDN result/error codes
856 #define CDN_NONE 0, 0
857 #define CDN_TRY_ANOTHER 2, 7
858 #define CDN_ADMIN_DISC 3, 0
859 #define CDN_UNAVAILABLE 4, 0
860
861 // RADIUS Acct-Terminate-Cause values
862 #define TERM_USER_REQUEST 1
863 #define TERM_LOST_CARRIER 2
864 #define TERM_LOST_SERVICE 3
865 #define TERM_IDLE_TIMEOUT 4
866 #define TERM_SESSION_TIMEOUT 5
867 #define TERM_ADMIN_RESET 6
868 #define TERM_ADMIN_REBOOT 7
869 #define TERM_PORT_ERROR 8
870 #define TERM_NAS_ERROR 9
871 #define TERM_NAS_REQUEST 10
872 #define TERM_NAS_REBOOT 11
873 #define TERM_PORT_UNNEEDED 12
874 #define TERM_PORT_PREEMPTED 13
875 #define TERM_PORT_SUSPENDED 14
876 #define TERM_SERVICE_UNAVAILABLE 15
877 #define TERM_CALLBACK 16
878 #define TERM_USER_ERROR 17
879 #define TERM_HOST_REQUEST 18
880 #define TERM_SUPPLICANT_RESTART 19
881 #define TERM_REAUTHENTICATION_FAILURE 20
882 #define TERM_PORT_REINIT 21
883 #define TERM_PORT_DISABLED 22
884
885 // on slaves, alow BGP to withdraw cleanly before exiting
886 #define QUIT_DELAY 5
887
888 // quit actions (master)
889 #define QUIT_FAILOVER 1 // SIGTERM: exit when all control messages have been acked (for cluster failover)
890 #define QUIT_SHUTDOWN 2 // SIGQUIT: shutdown sessions/tunnels, reject new connections
891
892 // arp.c
893 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
894
895
896 // ppp.c
897 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
898 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
899 void lcp_open(sessionidt s, tunnelidt t);
900 void lcp_restart(sessionidt s);
901 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
902 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
903 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
904 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
905 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
906 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
907 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
908 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
909 void sendchap(sessionidt s, tunnelidt t);
910 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);
911 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);
912 void sendlcp(sessionidt s, tunnelidt t);
913 void send_ipin(sessionidt s, uint8_t *buf, int len);
914 void sendccp(sessionidt s, tunnelidt t);
915 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
916 int join_bundle(sessionidt s);
917
918
919 // radius.c
920 void initrad(void);
921 void radiussend(uint16_t r, uint8_t state);
922 void processrad(uint8_t *buf, int len, char socket_index);
923 void radiusretry(uint16_t r);
924 uint16_t radiusnew(sessionidt s);
925 void radiusclear(uint16_t r, sessionidt s);
926 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
927 int rad_tunnel_pwdecode(uint8_t *pl2tpsecret, size_t *pl2tpsecretlen, const char *radiussecret, const uint8_t * auth);
928
929 // l2tpns.c
930 clockt backoff(uint8_t try);
931 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
932 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
933 sessionidt sessionbyip(in_addr_t ip);
934 sessionidt sessionbyipv6(struct in6_addr ip);
935 sessionidt sessionbyuser(char *username);
936 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
937 void random_data(uint8_t *buf, int len);
938 void sessionkill(sessionidt s, char *reason);
939 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
940 void filter_session(sessionidt s, int filter_in, int filter_out);
941 void send_garp(in_addr_t ip);
942 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
943 int tun_write(uint8_t *data, int size);
944 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
945 void sendipcp(sessionidt s, tunnelidt t);
946 void sendipv6cp(sessionidt s, tunnelidt t);
947 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr, uint16_t indexudpfd);
948 void processipout(uint8_t *buf, int len);
949 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
950 int find_filter(char const *name, size_t len);
951 int ip_filter(uint8_t *buf, int len, uint8_t filter);
952 int cmd_show_ipcache(struct cli_def *cli, const char *command, char **argv, int argc);
953 int cmd_show_hist_idle(struct cli_def *cli, const char *command, char **argv, int argc);
954 int cmd_show_hist_open(struct cli_def *cli, const char *command, char **argv, int argc);
955 tunnelidt lac_new_tunnel();
956 void lac_tunnelclear(tunnelidt t);
957 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len);
958 void lac_send_ICRQ(tunnelidt t, sessionidt s);
959 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg);
960
961 #undef LOG
962 #undef LOG_HEX
963 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
964 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
965
966 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
967 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
968
969
970 int sessionsetup(sessionidt s, tunnelidt t);
971 int run_plugins(int plugin_type, void *data);
972 void rebuild_address_pool(void);
973 void throttle_session(sessionidt s, int rate_in, int rate_out);
974 int load_session(sessionidt, sessiont *);
975 void become_master(void); // We're the master; kick off any required master initializations.
976
977
978 // cli.c
979 void init_cli();
980 void cli_init_complete(char *hostname);
981 void cli_do_file(FILE *fh);
982 void cli_do(int sockfd);
983 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
984
985
986 // icmp.c
987 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
988
989
990 extern tunnelt *tunnel;
991 extern bundlet *bundle;
992 extern sessiont *session;
993 extern sessionlocalt *sess_local;
994 extern ippoolt *ip_address_pool;
995 #define sessionfree (session[0].next)
996
997
998 extern configt *config;
999 extern time_t basetime; // Time when this process started.
1000 extern time_t time_now; // Seconds since EPOCH.
1001 extern char main_quit;
1002 extern uint32_t last_id;
1003 extern struct Tstats *_statistics;
1004 extern in_addr_t my_address;
1005 extern int clifd;
1006 extern int epollfd;
1007
1008 struct event_data {
1009 enum {
1010 FD_TYPE_CLI,
1011 FD_TYPE_CLUSTER,
1012 FD_TYPE_TUN,
1013 FD_TYPE_UDP,
1014 FD_TYPE_CONTROL,
1015 FD_TYPE_DAE,
1016 FD_TYPE_RADIUS,
1017 FD_TYPE_BGP,
1018 FD_TYPE_NETLINK,
1019 FD_TYPE_PPPOEDISC,
1020 FD_TYPE_PPPOESESS
1021 } type;
1022 int index; // for RADIUS, BGP, UDP
1023 };
1024
1025 #define TIME (config->current_time)
1026
1027 extern uint16_t MRU;
1028 extern uint16_t MSS;
1029
1030 // macros for handling help in cli commands
1031 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
1032 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
1033
1034 #endif /* __L2TPNS_H__ */