953c0582c10b8edd3aefa8c244e8ba4e358021f7
[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 <sys/socket.h>
13 #include <arpa/inet.h>
14 #include <sys/types.h>
15 #include <libcli.h>
16
17 #define VERSION "2.2.1"
18
19 // Limits
20 #define MAXTUNNEL 500 // could be up to 65535
21 #define MAXBUNDLE 300 // could be up to 65535
22 #define MAXBUNDLESES 12 // Maximum number of member links in bundle
23 #define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address
24 #define MAXSESSION 60000 // could be up to 65535
25 #define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
26
27 #define RADIUS_SHIFT 6
28 #define RADIUS_FDS (1 << RADIUS_SHIFT)
29 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
30 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
31
32 #define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
33 #define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
34
35 #define MAXCONTROL 1000 // max length control message we ever send...
36 #define MINMTU 576 // minimum recommended MTU (rfc1063)
37 #define MAXMTU 2600 // arbitrary maximum MTU
38 #define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
39 #define MAXETHER (MAXMTU+18) // max packet we try sending to tun
40 #define MAXTEL 96 // telephone number
41 #define MAXHOSTNAME 256 // hostname
42 #define MAXUSER 128 // username
43 #define MAXPASS 128 // password
44 #define MAXCLASS 128 // radius class attribute size
45 #define MAXPLUGINS 20 // maximum number of plugins to load
46 #define MAXRADSERVER 10 // max radius servers
47 #define MAXROUTE 10 // max static routes per session
48 #define MAXIPPOOL 131072 // max number of ip addresses in pool
49 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
50 #define MAX_LOG_LENGTH 512 // Maximum size of log message
51 #define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation
52 #define IDLE_TIMEOUT 240 // Time between last packet seen and session shutdown
53 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
54
55 #define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header
56 #define MP_END 0x40 // This value is used when (e)nd bit is set in MP header
57 #define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header
58
59 #define MINFRAGLEN 64 // Minumum fragment length
60 #define MAXFRAGLEN 1496 // Maximum length for Multilink fragment (The multilink may contain only one link)
61 #define MAXFRAGNUM 512 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
62 // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
63 #define MAXFRAGNUM_MASK 511 // Must be equal to MAXFRAGNUM-1
64
65 // Constants
66 #ifndef ETCDIR
67 #define ETCDIR "/etc/l2tpns"
68 #endif
69
70 #ifndef LIBDIR
71 #define LIBDIR "/usr/lib/l2tpns"
72 #endif
73
74 #ifndef PLUGINDIR
75 #define PLUGINDIR LIBDIR // Plugins
76 #endif
77
78 #ifndef PLUGINCONF
79 #define PLUGINCONF ETCDIR // Plugin config dir
80 #endif
81
82 #ifndef FLASHDIR
83 #define FLASHDIR ETCDIR
84 #endif
85
86 #define TUNDEVICE "/dev/net/tun"
87 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
88 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
89 #define CLIUSERS FLASHDIR "/users" // CLI Users file
90 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
91 #define ACCT_TIME 3000 // 5 minute accounting interval
92 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
93 #define L2TPPORT 1701 // L2TP port
94 #define RADPORT 1645 // old radius port...
95 #define DAEPORT 3799 // DAE port
96 #define PKTARP 0x0806 // ARP packet type
97 #define PKTIP 0x0800 // IPv4 packet type
98 #define PKTIPV6 0x86DD // IPv6 packet type
99 #define PPPPAP 0xC023
100 #define PPPCHAP 0xC223
101 #define PPPLCP 0xC021
102 #define PPPIPCP 0x8021
103 #define PPPIPV6CP 0x8057
104 #define PPPCCP 0x80FD
105 #define PPPIP 0x0021
106 #define PPPIPV6 0x0057
107 #define PPPMP 0x003D
108 #define MIN_IP_SIZE 0x19
109
110 enum {
111 ConfigReq = 1,
112 ConfigAck,
113 ConfigNak,
114 ConfigRej,
115 TerminateReq,
116 TerminateAck,
117 CodeRej,
118 ProtocolRej,
119 EchoReq,
120 EchoReply,
121 DiscardRequest,
122 IdentRequest
123 };
124
125 enum {
126 AccessRequest = 1,
127 AccessAccept,
128 AccessReject,
129 AccountingRequest,
130 AccountingResponse,
131 AccessChallenge = 11,
132 DisconnectRequest = 40,
133 DisconnectACK,
134 DisconnectNAK,
135 CoARequest,
136 CoAACK,
137 CoANAK
138 };
139
140 // PPP phases
141 enum {
142 Dead,
143 Establish,
144 Authenticate,
145 Network,
146 Terminate
147 };
148
149 // PPP states
150 enum {
151 Initial,
152 Starting,
153 Closed,
154 Stopped,
155 Closing,
156 Stopping,
157 RequestSent,
158 AckReceived,
159 AckSent,
160 Opened
161 };
162
163 // reset state machine counters
164 #define initialise_restart_count(_s, _fsm) \
165 sess_local[_s]._fsm.conf_sent = \
166 sess_local[_s]._fsm.nak_sent = 0
167
168 // no more attempts
169 #define zero_restart_count(_s, _fsm) ({ \
170 sess_local[_s]._fsm.conf_sent = \
171 config->ppp_max_configure; \
172 sess_local[_s]._fsm.restart = \
173 time_now + config->ppp_restart_time; \
174 })
175
176 // increment ConfReq counter and reset timer
177 #define restart_timer(_s, _fsm) ({ \
178 sess_local[_s]._fsm.conf_sent++; \
179 sess_local[_s]._fsm.restart = \
180 time_now + config->ppp_restart_time; \
181 })
182
183 // stop timer on change to state where timer does not run
184 #define change_state(_s, _fsm, _new) ({ \
185 if (_new != session[_s].ppp._fsm) \
186 { \
187 switch (_new) \
188 { \
189 case Initial: \
190 case Starting: \
191 case Closed: \
192 case Stopped: \
193 case Opened: \
194 sess_local[_s]._fsm.restart = 0; \
195 initialise_restart_count(_s, _fsm); \
196 } \
197 session[_s].ppp._fsm = _new; \
198 cluster_send_session(_s); \
199 } \
200 })
201
202 // Types
203 typedef uint16_t sessionidt;
204 typedef uint16_t bundleidt;
205 typedef uint16_t tunnelidt;
206 typedef uint32_t clockt;
207 typedef uint8_t hasht[16];
208
209 // CLI actions
210 struct cli_session_actions {
211 char action;
212 in_addr_t snoop_ip;
213 uint16_t snoop_port;
214 int throttle_in;
215 int throttle_out;
216 int filter_in;
217 int filter_out;
218 };
219
220 #define CLI_SESS_KILL 0x01
221 #define CLI_SESS_SNOOP 0x02
222 #define CLI_SESS_NOSNOOP 0x04
223 #define CLI_SESS_THROTTLE 0x08
224 #define CLI_SESS_NOTHROTTLE 0x10
225 #define CLI_SESS_FILTER 0x20
226 #define CLI_SESS_NOFILTER 0x40
227
228 struct cli_tunnel_actions {
229 char action;
230 };
231
232 #define CLI_TUN_KILL 0x01
233
234 // structures
235 typedef struct // route
236 {
237 in_addr_t ip;
238 int prefixlen;
239 }
240 routet;
241
242 typedef struct controls // control message
243 {
244 struct controls *next; // next in queue
245 uint16_t length; // length
246 union {
247 uint8_t buf[MAXCONTROL];
248 uint16_t buf16[MAXCONTROL/2];
249 } __attribute__ ((__transparent_union__));
250 }
251 controlt;
252
253 typedef struct {
254 uint8_t length; // Endpoint Discriminator length
255 uint8_t addr_class; // Endpoint Discriminator class
256 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
257 } epdist;
258
259 typedef struct {
260 sessionidt sid; // Fragment originating session
261 tunnelidt tid; // Fragment originating tunnel
262 uint8_t flags; // MP frame flags
263 uint32_t seq; // fragment seq num
264 uint16_t length; // Fragment length
265 uint8_t data[MAXFRAGLEN]; // Fragment data
266 } fragmentt;
267
268 typedef struct
269 {
270 sessionidt next; // next session in linked list
271 sessionidt far; // far end session ID
272 tunnelidt tunnel; // near end tunnel ID
273 uint8_t flags; // session flags: see SESSION_*
274 struct {
275 uint8_t phase; // PPP phase
276 uint8_t lcp:4; // LCP state
277 uint8_t ipcp:4; // IPCP state
278 uint8_t ipv6cp:4; // IPV6CP state
279 uint8_t ccp:4; // CCP state
280 } ppp;
281 uint16_t mru; // maximum receive unit
282 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
283 int ip_pool_index; // index to IP pool
284 uint32_t unique_id; // unique session id
285 uint32_t magic; // ppp magic number
286 uint32_t pin, pout; // packet counts
287 uint32_t cin, cout; // byte counts
288 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
289 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
290 uint16_t throttle_in; // upstream throttle rate (kbps)
291 uint16_t throttle_out; // downstream throttle rate
292 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
293 uint8_t filter_out; // output filter index
294 uint16_t snoop_port; // Interception destination port
295 in_addr_t snoop_ip; // Interception destination IP
296 clockt opened; // when started
297 clockt die; // being closed, when to finally free
298 uint32_t session_timeout; // Maximum session time in seconds
299 uint32_t idle_timeout; // Maximum idle time in seconds
300 time_t last_packet; // Last packet from the user (used for idle timeouts)
301 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
302 in_addr_t dns1, dns2; // DNS servers
303 routet route[MAXROUTE]; // static routes
304 uint16_t tbf_in; // filter bucket for throttling in from the user.
305 uint16_t tbf_out; // filter bucket for throttling out to the user.
306 int random_vector_length;
307 uint8_t random_vector[MAXTEL];
308 char user[MAXUSER]; // user (needed in session for radius stop messages)
309 char called[MAXTEL]; // called number
310 char calling[MAXTEL]; // calling number
311 uint32_t tx_connect_speed;
312 uint32_t rx_connect_speed;
313 clockt timeout; // Session timeout
314 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
315 epdist epdis; // Multilink Endpoint Discriminator
316 bundleidt bundle; // Multilink Bundle Identifier
317 uint8_t mssf; // Multilink Short Sequence Number Header Format
318 uint8_t walled_garden; // is this session gardened?
319 uint8_t classlen; // class (needed for radius accounting messages)
320 char class[MAXCLASS];
321 uint8_t ipv6prefixlen; // IPv6 route prefix length
322 struct in6_addr ipv6route; // Static IPv6 route
323 char reserved[12]; // Space to expand structure without changing HB_VERSION
324 }
325 sessiont;
326
327 typedef struct
328 {
329 int state; // current state (bundlestate enum)
330 uint32_t seq_num_t; // Sequence Number (transmission)
331 uint32_t timeout; // Session-Timeout for bundle
332 uint32_t max_seq; // Max value of sequence number field
333 uint8_t num_of_links; // Number of links joint to this bundle
334 uint32_t online_time; // The time this bundle is online
335 clockt last_check; // Last time the timeout is checked
336 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
337 uint8_t mssf; // Multilink Short Sequence Number Header Format
338 epdist epdis; // Multilink Endpoint Discriminator
339 char user[MAXUSER]; // Needed for matching member links
340 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
341 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
342 }
343 bundlet;
344
345 typedef struct
346 {
347 fragmentt fragment[MAXFRAGNUM];
348 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
349 uint16_t re_frame_len; // The reassembled frame length
350 uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
351 uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
352 uint32_t M; // Minumum frame sequence number received over all bundle members
353 uint32_t start_seq; // Last received frame sequence number (bearing B bit)
354 }
355 fragmentationt;
356
357 #define AUTHPAP 1 // allow PAP
358 #define AUTHCHAP 2 // allow CHAP
359
360 typedef struct
361 {
362 // packet counters
363 uint32_t pin;
364 uint32_t pout;
365
366 // byte counters
367 uint32_t cin;
368 uint32_t cout;
369
370 // PPP restart timer/counters
371 struct {
372 time_t restart;
373 int conf_sent;
374 int nak_sent;
375 } lcp, ipcp, ipv6cp, ccp;
376
377 // identifier for Protocol-Reject, Code-Reject
378 uint8_t lcp_ident;
379
380 // authentication to use
381 int lcp_authtype;
382
383 // our MRU
384 uint16_t ppp_mru;
385
386 // our MRRU
387 uint16_t mp_mrru;
388
389 // our mssf
390 uint16_t mp_mssf;
391
392 // our Endpoint Discriminator
393 in_addr_t mp_epdis;
394
395 // DoS prevention
396 clockt last_packet_out;
397 uint32_t packets_out;
398 uint32_t packets_dropped;
399
400 // RADIUS session in use
401 uint16_t radius;
402
403 // interim RADIUS
404 time_t last_interim;
405
406 // last LCP Echo
407 time_t last_echo;
408
409 // Last Multilink frame sequence number received
410 uint32_t last_seq;
411 } sessionlocalt;
412
413 // session flags
414 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
415 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
416 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
417
418 // 168 bytes per tunnel
419 typedef struct
420 {
421 tunnelidt far; // far end tunnel ID
422 in_addr_t ip; // Ip for far end
423 uint16_t port; // port for far end
424 uint16_t window; // Rx window
425 uint16_t nr; // next receive
426 uint16_t ns; // next send
427 int state; // current state (tunnelstate enum)
428 clockt last; // when last control message sent (used for resend timeout)
429 clockt retry; // when to try resending pending control
430 clockt die; // being closed, when to finally free
431 clockt lastrec; // when the last control message was received
432 char hostname[128]; // tunnel hostname
433 char vendor[128]; // LAC vendor
434 uint8_t try; // number of retrys on a control message
435 uint16_t controlc; // outstaind messages in queue
436 controlt *controls; // oldest message
437 controlt *controle; // newest message
438 }
439 tunnelt;
440
441 // 164 bytes per radius session
442 typedef struct // outstanding RADIUS requests
443 {
444 sessionidt session; // which session this applies to
445 hasht auth; // request authenticator
446 clockt retry; // when to try next
447 char pass[129]; // password
448 uint8_t id; // ID for PPP response
449 uint8_t try; // which try we are on
450 uint8_t state; // state of radius requests
451 uint8_t chap; // set if CHAP used (is CHAP identifier)
452 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
453 char const *term_msg; // terminate reason
454 }
455 radiust;
456
457 typedef struct
458 {
459 in_addr_t address; // Host byte order..
460 char assigned; // 1 if assigned, 0 if free
461 sessionidt session;
462 clockt last; // last used
463 char user[129]; // user (try to have ip addresses persistent)
464 }
465 ippoolt;
466
467 #ifdef RINGBUFFER
468 struct Tringbuffer
469 {
470 struct {
471 char level;
472 sessionidt session;
473 tunnelidt tunnel;
474 char message[MAX_LOG_LENGTH];
475 } buffer[RINGBUFFER_SIZE];
476 int head;
477 int tail;
478 };
479 #endif
480
481 /*
482 * Possible tunnel states
483 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
484 */
485 enum
486 {
487 TUNNELFREE, // Not in use
488 TUNNELOPEN, // Active tunnel
489 TUNNELDIE, // Currently closing
490 TUNNELOPENING, // Busy opening
491 TUNNELUNDEF, // Undefined
492 };
493
494 enum
495 {
496 BUNDLEFREE, // Not in use
497 BUNDLEOPEN, // Active bundle
498 BUNDLEUNDEF, // Undefined
499 };
500
501 enum
502 {
503 NULLCLASS = 0, //End Point Discriminator classes
504 LOCALADDR,
505 IPADDR,
506 IEEEMACADDR,
507 PPPMAGIC,
508 PSNDN,
509 };
510
511 enum
512 {
513 RADIUSNULL, // Not in use
514 RADIUSCHAP, // sending CHAP down PPP
515 RADIUSAUTH, // sending auth to RADIUS server
516 RADIUSSTART, // sending start accounting to RADIUS server
517 RADIUSSTOP, // sending stop accounting to RADIUS server
518 RADIUSINTERIM, // sending interim accounting to RADIUS server
519 RADIUSWAIT, // waiting timeout before available, in case delayed replies
520 RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
521 };
522
523 struct Tstats
524 {
525 time_t start_time;
526 time_t last_reset;
527
528 uint32_t tun_rx_packets;
529 uint32_t tun_tx_packets;
530 uint32_t tun_rx_bytes;
531 uint32_t tun_tx_bytes;
532 uint32_t tun_rx_errors;
533 uint32_t tun_tx_errors;
534 uint32_t tun_rx_dropped;
535
536 uint32_t tunnel_rx_packets;
537 uint32_t tunnel_tx_packets;
538 uint32_t tunnel_rx_bytes;
539 uint32_t tunnel_tx_bytes;
540 uint32_t tunnel_rx_errors;
541 uint32_t tunnel_tx_errors;
542
543 uint32_t tunnel_retries;
544 uint32_t radius_retries;
545
546 uint32_t arp_sent;
547
548 uint32_t packets_snooped;
549
550 uint32_t tunnel_created;
551 uint32_t session_created;
552 uint32_t tunnel_timeout;
553 uint32_t session_timeout;
554 uint32_t radius_timeout;
555 uint32_t radius_overflow;
556 uint32_t tunnel_overflow;
557 uint32_t session_overflow;
558
559 uint32_t ip_allocated;
560 uint32_t ip_freed;
561
562 uint32_t c_forwarded;
563 uint32_t recv_forward;
564
565 uint32_t select_called;
566 uint32_t multi_read_used;
567 uint32_t multi_read_exceeded;
568
569 #ifdef STATISTICS
570 uint32_t call_processtun;
571 uint32_t call_processipout;
572 uint32_t call_processipv6out;
573 uint32_t call_processudp;
574 uint32_t call_sessionbyip;
575 uint32_t call_sessionbyipv6;
576 uint32_t call_sessionbyuser;
577 uint32_t call_sendarp;
578 uint32_t call_sendipcp;
579 uint32_t call_sendipv6cp;
580 uint32_t call_processipv6cp;
581 uint32_t call_tunnelsend;
582 uint32_t call_sessionkill;
583 uint32_t call_sessionshutdown;
584 uint32_t call_tunnelkill;
585 uint32_t call_tunnelshutdown;
586 uint32_t call_assign_ip_address;
587 uint32_t call_free_ip_address;
588 uint32_t call_dump_acct_info;
589 uint32_t call_sessionsetup;
590 uint32_t call_processpap;
591 uint32_t call_processchap;
592 uint32_t call_processlcp;
593 uint32_t call_processipcp;
594 uint32_t call_processipin;
595 uint32_t call_processipv6in;
596 uint32_t call_processccp;
597 uint32_t call_sendchap;
598 uint32_t call_processrad;
599 uint32_t call_radiussend;
600 uint32_t call_radiusretry;
601 uint32_t call_random_data;
602 #endif
603 };
604
605 #ifdef STATISTICS
606
607 #ifdef STAT_CALLS
608 #define CSTAT(x) STAT(call_ ## x)
609 #else
610 #define CSTAT(x)
611 #endif
612
613 #define STAT(x) (_statistics->x++)
614 #define INC_STAT(x,y) (_statistics->x += (y))
615 #define GET_STAT(x) (_statistics->x)
616 #define SET_STAT(x, y) (_statistics->x = (y))
617 #else
618 #define CSTAT(x)
619 #define STAT(x)
620 #define INC_STAT(x,y)
621 #define GET_STAT(x) 0
622 #define SET_STAT(x, y)
623 #endif
624
625 #ifndef IFNAMSIZ
626 # define IFNAMSIZ 16
627 #endif
628
629 typedef struct
630 {
631 int debug; // debugging level
632 time_t start_time; // time when l2tpns was started
633 char bandwidth[256]; // current bandwidth
634 char pid_file[256]; // file to write PID to on startup
635 int wrote_pid;
636 clockt current_time; // 1/10ths of a second since the process started.
637 // means that we can only run a given process
638 // for 13 years without re-starting!
639
640 char config_file[128];
641 int reload_config; // flag to re-read config (set by cli)
642 int multi_read_count; // amount of packets to read per fd in processing loop
643
644 char tundevice[IFNAMSIZ]; // tun device name
645 char log_filename[128];
646
647 char l2tp_secret[64]; // L2TP shared secret
648 int l2tp_mtu; // MTU of interface used for L2TP
649
650 char random_device[256]; // random device path, defaults to RANDOMDEVICE
651
652 int ppp_restart_time; // timeout for PPP restart
653 int ppp_max_configure; // max lcp configure requests to send
654 int ppp_max_failure; // max lcp configure naks to send
655
656 char radiussecret[64];
657 int radius_accounting;
658 int radius_interim;
659 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
660 uint16_t radiusport[MAXRADSERVER]; // radius base ports
661 uint8_t numradiusservers; // radius server count
662
663 uint16_t radius_dae_port; // port for radius DAE
664 uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
665 uint16_t radius_bind_max;
666
667 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
668 int radius_authtypes;
669 int radius_authprefer;
670
671 int allow_duplicate_users; // allow multiple logins with the same username
672 int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
673
674 in_addr_t default_dns1, default_dns2;
675
676 unsigned long rl_rate; // default throttle rate
677 int num_tbfs; // number of throttle buckets
678
679 char accounting_dir[128];
680 in_addr_t bind_address;
681 in_addr_t peer_address;
682 int send_garp; // Set to true to garp for vip address on startup
683
684 int dump_speed;
685 char plugins[64][MAXPLUGINS];
686 char old_plugins[64][MAXPLUGINS];
687
688 int next_tbf; // Next HTB id available to use
689 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
690 // policy for this process.
691 int lock_pages; // Lock pages into memory.
692 int icmp_rate; // Max number of ICMP unreachable per second to send
693 int max_packets; // DoS prevention: per session limit of packets/0.1s
694 char epdis_addr[20]; // MP Endpoint Discriminator address
695
696 in_addr_t cluster_address; // Multicast address of cluster.
697 // Send to this address to have everyone hear.
698 char cluster_interface[64]; // Which interface to listen for multicast on.
699 int cluster_iam_master; // Are we the cluster master???
700 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
701 in_addr_t cluster_master_address; // The network address of the cluster master.
702 // Zero if i am the cluster master.
703 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
704 // (or the seq number we're next expecting if we're a slave).
705 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
706 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
707 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
708 int cluster_highest_sessionid;
709 int cluster_highest_bundleid;
710 int cluster_highest_tunnelid;
711 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
712 int cluster_last_hb_ver; // Heartbeat version last seen from master
713 int cluster_num_changes; // Number of changes queued.
714
715 int cluster_mcast_ttl; // TTL for multicast packets
716 int cluster_hb_interval; // How often to send a heartbeat.
717 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
718 uint64_t cluster_table_version; // # state changes processed by cluster
719
720 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
721
722
723 int cluster_master_min_adv; // Master advertises routes while the number of up to date
724 // slaves is less than this value.
725 in_addr_t cli_bind_address; // bind address for CLI
726 char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
727 // Guest change
728 char guest_user[MAXUSER]; // Guest account username
729
730 #ifdef BGP
731 #define BGP_NUM_PEERS 2
732 uint16_t as_number;
733 struct {
734 char name[64];
735 uint16_t as;
736 int keepalive;
737 int hold;
738 struct in_addr update_source;
739 } neighbour[BGP_NUM_PEERS];
740 in_addr_t nexthop_address;
741 struct in6_addr nexthop6_address;
742 #endif
743 } configt;
744
745 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
746 typedef struct
747 {
748 char *key;
749 int offset;
750 int size;
751 enum config_typet type;
752 } config_descriptt;
753
754 typedef struct
755 {
756 uint8_t op; // operation
757 #define FILTER_PORT_OP_NONE 0 // all ports match
758 #define FILTER_PORT_OP_EQ 1
759 #define FILTER_PORT_OP_NEQ 2
760 #define FILTER_PORT_OP_GT 3
761 #define FILTER_PORT_OP_LT 4
762 #define FILTER_PORT_OP_RANGE 5
763 uint16_t port; // port (host byte order)
764 uint16_t port2; // range
765 } ip_filter_portt;
766
767 typedef struct
768 {
769 int action; // permit/deny
770 #define FILTER_ACTION_DENY 1
771 #define FILTER_ACTION_PERMIT 2
772 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
773 in_addr_t src_ip; // source ip (network byte order)
774 in_addr_t src_wild;
775 ip_filter_portt src_ports;
776 in_addr_t dst_ip; // dest ip
777 in_addr_t dst_wild;
778 ip_filter_portt dst_ports;
779 uint8_t frag; // apply to non-initial fragments
780 uint8_t tcp_flag_op; // match type: any, all, established
781 #define FILTER_FLAG_OP_ANY 1
782 #define FILTER_FLAG_OP_ALL 2
783 #define FILTER_FLAG_OP_EST 3
784 uint8_t tcp_sflags; // flags set
785 uint8_t tcp_cflags; // flags clear
786 uint32_t counter; // match count
787 } ip_filter_rulet;
788
789 #define TCP_FLAG_FIN 0x01
790 #define TCP_FLAG_SYN 0x02
791 #define TCP_FLAG_RST 0x04
792 #define TCP_FLAG_PSH 0x08
793 #define TCP_FLAG_ACK 0x10
794 #define TCP_FLAG_URG 0x20
795
796 #define MAXFILTER 32
797 #define MAXFILTER_RULES 32
798 typedef struct
799 {
800 char name[32]; // ACL name
801 int extended; // type: 0 = standard, 1 = extended
802 ip_filter_rulet rules[MAXFILTER_RULES];
803 int used; // session ref count
804 } ip_filtert;
805
806 // CDN result/error codes
807 #define CDN_NONE 0, 0
808 #define CDN_TRY_ANOTHER 2, 7
809 #define CDN_ADMIN_DISC 3, 0
810 #define CDN_UNAVAILABLE 4, 0
811
812 // RADIUS Acct-Terminate-Cause values
813 #define TERM_USER_REQUEST 1
814 #define TERM_LOST_CARRIER 2
815 #define TERM_LOST_SERVICE 3
816 #define TERM_IDLE_TIMEOUT 4
817 #define TERM_SESSION_TIMEOUT 5
818 #define TERM_ADMIN_RESET 6
819 #define TERM_ADMIN_REBOOT 7
820 #define TERM_PORT_ERROR 8
821 #define TERM_NAS_ERROR 9
822 #define TERM_NAS_REQUEST 10
823 #define TERM_NAS_REBOOT 11
824 #define TERM_PORT_UNNEEDED 12
825 #define TERM_PORT_PREEMPTED 13
826 #define TERM_PORT_SUSPENDED 14
827 #define TERM_SERVICE_UNAVAILABLE 15
828 #define TERM_CALLBACK 16
829 #define TERM_USER_ERROR 17
830 #define TERM_HOST_REQUEST 18
831 #define TERM_SUPPLICANT_RESTART 19
832 #define TERM_REAUTHENTICATION_FAILURE 20
833 #define TERM_PORT_REINIT 21
834 #define TERM_PORT_DISABLED 22
835
836 // arp.c
837 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
838
839
840 // ppp.c
841 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
842 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
843 void lcp_open(sessionidt s, tunnelidt t);
844 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
845 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
846 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
847 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
848 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
849 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
850 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
851 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
852 void sendchap(sessionidt s, tunnelidt t);
853 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);
854 void sendlcp(sessionidt s, tunnelidt t);
855 void send_ipin(sessionidt s, uint8_t *buf, int len);
856 void sendccp(sessionidt s, tunnelidt t);
857 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
858 int join_bundle(sessionidt s);
859
860
861 // radius.c
862 void initrad(void);
863 void radiussend(uint16_t r, uint8_t state);
864 void processrad(uint8_t *buf, int len, char socket_index);
865 void radiusretry(uint16_t r);
866 uint16_t radiusnew(sessionidt s);
867 void radiusclear(uint16_t r, sessionidt s);
868 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
869
870
871 // l2tpns.c
872 clockt backoff(uint8_t try);
873 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
874 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
875 sessionidt sessionbyip(in_addr_t ip);
876 sessionidt sessionbyipv6(struct in6_addr ip);
877 sessionidt sessionbyuser(char *username);
878 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
879 void random_data(uint8_t *buf, int len);
880 void sessionkill(sessionidt s, char *reason);
881 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
882 void filter_session(sessionidt s, int filter_in, int filter_out);
883 void send_garp(in_addr_t ip);
884 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
885 int tun_write(uint8_t *data, int size);
886 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
887 void sendipcp(sessionidt s, tunnelidt t);
888 void sendipv6cp(sessionidt s, tunnelidt t);
889 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
890 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
891 int find_filter(char const *name, size_t len);
892 int ip_filter(uint8_t *buf, int len, uint8_t filter);
893 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
894 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
895 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
896
897 #undef LOG
898 #undef LOG_HEX
899 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
900 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
901
902 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
903 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
904
905
906 int sessionsetup(sessionidt s, tunnelidt t);
907 int run_plugins(int plugin_type, void *data);
908 void rebuild_address_pool(void);
909 void throttle_session(sessionidt s, int rate_in, int rate_out);
910 int load_session(sessionidt, sessiont *);
911 void become_master(void); // We're the master; kick off any required master initializations.
912
913
914 // cli.c
915 void init_cli();
916 void cli_init_complete(char *hostname);
917 void cli_do_file(FILE *fh);
918 void cli_do(int sockfd);
919 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
920
921
922 // icmp.c
923 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
924
925
926 extern tunnelt *tunnel;
927 extern bundlet *bundle;
928 extern sessiont *session;
929 extern sessionlocalt *sess_local;
930 extern ippoolt *ip_address_pool;
931 #define sessionfree (session[0].next)
932
933
934 extern configt *config;
935 extern time_t basetime; // Time when this process started.
936 extern time_t time_now; // Seconds since EPOCH.
937 extern char main_quit;
938 extern uint32_t last_id;
939 extern struct Tstats *_statistics;
940 extern in_addr_t my_address;
941 extern int clifd;
942 extern int epollfd;
943
944 struct event_data {
945 enum {
946 FD_TYPE_CLI,
947 FD_TYPE_CLUSTER,
948 FD_TYPE_TUN,
949 FD_TYPE_UDP,
950 FD_TYPE_CONTROL,
951 FD_TYPE_DAE,
952 FD_TYPE_RADIUS,
953 FD_TYPE_BGP,
954 FD_TYPE_NETLINK,
955 } type;
956 int index; // for RADIUS, BGP
957 };
958
959 #define TIME (config->current_time)
960
961 extern uint16_t MRU;
962 extern uint16_t MSS;
963
964 // macros for handling help in cli commands
965 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
966 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
967
968 #endif /* __L2TPNS_H__ */