f38e9f3547871c8eddf8a0f91ed42174be7a23ce
[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 "2.2.0"
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 MAXPLUGINS 20 // maximum number of plugins to load
45 #define MAXRADSERVER 10 // max radius servers
46 #define MAXROUTE 10 // max static routes per session
47 #define MAXIPPOOL 131072 // max number of ip addresses in pool
48 #define RINGBUFFER_SIZE 10000 // Number of ringbuffer entries to allocate
49 #define MAX_LOG_LENGTH 512 // Maximum size of log message
50 #define ECHO_TIMEOUT 10 // Time between last packet sent and LCP ECHO generation
51 #define IDLE_TIMEOUT 240 // Time between last packet seen and session shutdown
52 #define BUSY_WAIT_TIME 3000 // 5 minutes in 1/10th seconds to wait for radius to cleanup on shutdown
53
54 #define MP_BEGIN 0x80 // This value is used when (b)egin bit is set in MP header
55 #define MP_END 0x40 // This value is used when (e)nd bit is set in MP header
56 #define MP_BOTH_BITS 0xC0 // This value is used when both bits (begin and end) are set in MP header
57
58 #define MINFRAGLEN 64 // Minumum fragment length
59 #define MAXFRAGLEN 750 // Maximum length for Multilink fragment (MTU / 2 sessions)
60 #define MAXFRAGNUM 128 // Maximum number of Multilink fragment in a bundle (must be in the form of 2^X)
61 // it's not expected to have a space for more than 10 unassembled packets = 10 * MAXBUNDLESES
62 #define MAXFRAGNUM_MASK 127 // Must be equal to MAXFRAGNUM-1
63
64 // Constants
65 #ifndef ETCDIR
66 #define ETCDIR "/etc/l2tpns"
67 #endif
68
69 #ifndef LIBDIR
70 #define LIBDIR "/usr/lib/l2tpns"
71 #endif
72
73 #ifndef PLUGINDIR
74 #define PLUGINDIR LIBDIR // Plugins
75 #endif
76
77 #ifndef PLUGINCONF
78 #define PLUGINCONF ETCDIR // Plugin config dir
79 #endif
80
81 #ifndef FLASHDIR
82 #define FLASHDIR ETCDIR
83 #endif
84
85 #define TUNDEVICE "/dev/net/tun"
86 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
87 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
88 #define CLIUSERS FLASHDIR "/users" // CLI Users file
89 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
90 #define ACCT_TIME 3000 // 5 minute accounting interval
91 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
92 #define L2TPPORT 1701 // L2TP port
93 #define RADPORT 1645 // old radius port...
94 #define DAEPORT 3799 // DAE port
95 #define PKTARP 0x0806 // ARP packet type
96 #define PKTIP 0x0800 // IPv4 packet type
97 #define PKTIPV6 0x86DD // IPv6 packet type
98 #define PPPPAP 0xC023
99 #define PPPCHAP 0xC223
100 #define PPPLCP 0xC021
101 #define PPPIPCP 0x8021
102 #define PPPIPV6CP 0x8057
103 #define PPPCCP 0x80FD
104 #define PPPIP 0x0021
105 #define PPPIPV6 0x0057
106 #define PPPMP 0x003D
107 #define MIN_IP_SIZE 0x19
108
109 enum {
110 ConfigReq = 1,
111 ConfigAck,
112 ConfigNak,
113 ConfigRej,
114 TerminateReq,
115 TerminateAck,
116 CodeRej,
117 ProtocolRej,
118 EchoReq,
119 EchoReply,
120 DiscardRequest,
121 IdentRequest
122 };
123
124 enum {
125 AccessRequest = 1,
126 AccessAccept,
127 AccessReject,
128 AccountingRequest,
129 AccountingResponse,
130 AccessChallenge = 11,
131 DisconnectRequest = 40,
132 DisconnectACK,
133 DisconnectNAK,
134 CoARequest,
135 CoAACK,
136 CoANAK
137 };
138
139 // PPP phases
140 enum {
141 Dead,
142 Establish,
143 Authenticate,
144 Network,
145 Terminate
146 };
147
148 // PPP states
149 enum {
150 Initial,
151 Starting,
152 Closed,
153 Stopped,
154 Closing,
155 Stopping,
156 RequestSent,
157 AckReceived,
158 AckSent,
159 Opened
160 };
161
162 // reset state machine counters
163 #define initialise_restart_count(_s, _fsm) \
164 sess_local[_s]._fsm.conf_sent = \
165 sess_local[_s]._fsm.nak_sent = 0
166
167 // no more attempts
168 #define zero_restart_count(_s, _fsm) ({ \
169 sess_local[_s]._fsm.conf_sent = \
170 config->ppp_max_configure; \
171 sess_local[_s]._fsm.restart = \
172 time_now + config->ppp_restart_time; \
173 })
174
175 // increment ConfReq counter and reset timer
176 #define restart_timer(_s, _fsm) ({ \
177 sess_local[_s]._fsm.conf_sent++; \
178 sess_local[_s]._fsm.restart = \
179 time_now + config->ppp_restart_time; \
180 })
181
182 // stop timer on change to state where timer does not run
183 #define change_state(_s, _fsm, _new) ({ \
184 if (_new != session[_s].ppp._fsm) \
185 { \
186 switch (_new) \
187 { \
188 case Initial: \
189 case Starting: \
190 case Closed: \
191 case Stopped: \
192 case Opened: \
193 sess_local[_s]._fsm.restart = 0; \
194 initialise_restart_count(_s, _fsm); \
195 } \
196 session[_s].ppp._fsm = _new; \
197 cluster_send_session(_s); \
198 } \
199 })
200
201 // Types
202 typedef uint16_t sessionidt;
203 typedef uint16_t bundleidt;
204 typedef uint16_t tunnelidt;
205 typedef uint32_t clockt;
206 typedef uint8_t hasht[16];
207
208 // CLI actions
209 struct cli_session_actions {
210 char action;
211 in_addr_t snoop_ip;
212 uint16_t snoop_port;
213 int throttle_in;
214 int throttle_out;
215 int filter_in;
216 int filter_out;
217 };
218
219 #define CLI_SESS_KILL 0x01
220 #define CLI_SESS_SNOOP 0x02
221 #define CLI_SESS_NOSNOOP 0x04
222 #define CLI_SESS_THROTTLE 0x08
223 #define CLI_SESS_NOTHROTTLE 0x10
224 #define CLI_SESS_FILTER 0x20
225 #define CLI_SESS_NOFILTER 0x40
226
227 struct cli_tunnel_actions {
228 char action;
229 };
230
231 #define CLI_TUN_KILL 0x01
232
233 // structures
234 typedef struct // route
235 {
236 in_addr_t ip;
237 int prefixlen;
238 }
239 routet;
240
241 typedef struct controls // control message
242 {
243 struct controls *next; // next in queue
244 uint16_t length; // length
245 union {
246 uint8_t buf[MAXCONTROL];
247 uint16_t buf16[MAXCONTROL/2];
248 } __attribute__ ((__transparent_union__));
249 }
250 controlt;
251
252 typedef struct {
253 uint8_t length; // Endpoint Discriminator length
254 uint8_t addr_class; // Endpoint Discriminator class
255 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
256 } epdist;
257
258 typedef struct {
259 sessionidt sid; // Fragment originating session
260 uint8_t flags; // MP frame flags
261 uint32_t seq; // fragment seq num
262 uint16_t length; // Fragment length
263 uint8_t data[MAXFRAGLEN]; // Fragment data
264 } fragmentt;
265
266 typedef struct
267 {
268 sessionidt next; // next session in linked list
269 sessionidt far; // far end session ID
270 tunnelidt tunnel; // near end tunnel ID
271 uint8_t flags; // session flags: see SESSION_*
272 struct {
273 uint8_t phase; // PPP phase
274 uint8_t lcp:4; // LCP state
275 uint8_t ipcp:4; // IPCP state
276 uint8_t ipv6cp:4; // IPV6CP state
277 uint8_t ccp:4; // CCP state
278 } ppp;
279 char reserved_1[2]; // unused: padding
280 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
281 int ip_pool_index; // index to IP pool
282 uint32_t unique_id; // unique session id
283 char reserved_2[4]; // unused: was ns/nr
284 uint32_t magic; // ppp magic number
285 uint32_t pin, pout; // packet counts
286 uint32_t cin, cout; // byte counts
287 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
288 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
289 uint16_t throttle_in; // upstream throttle rate (kbps)
290 uint16_t throttle_out; // downstream throttle rate
291 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
292 uint8_t filter_out; // output filter index
293 uint16_t mru; // maximum receive unit
294 clockt opened; // when started
295 clockt die; // being closed, when to finally free
296 uint32_t session_timeout; // Maximum session time in seconds
297 uint32_t idle_timeout; // Maximum idle time in seconds
298 time_t last_packet; // Last packet from the user (used for idle timeouts)
299 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
300 in_addr_t dns1, dns2; // DNS servers
301 routet route[MAXROUTE]; // static routes
302 uint16_t tbf_in; // filter bucket for throttling in from the user.
303 uint16_t tbf_out; // filter bucket for throttling out to the user.
304 int random_vector_length;
305 uint8_t random_vector[MAXTEL];
306 char user[MAXUSER]; // user (needed in seesion for radius stop messages)
307 char called[MAXTEL]; // called number
308 char calling[MAXTEL]; // calling number
309 uint32_t tx_connect_speed;
310 uint32_t rx_connect_speed;
311 clockt timeout; // Session timeout
312 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
313 uint8_t mssf; // Multilink Short Sequence Number Header Format
314 epdist epdis; // Multilink Endpoint Discriminator
315 bundleidt bundle; // Multilink Bundle Identifier
316 in_addr_t snoop_ip; // Interception destination IP
317 uint16_t snoop_port; // Interception destination port
318 uint8_t walled_garden; // is this session gardened?
319 uint8_t ipv6prefixlen; // IPv6 route prefix length
320 struct in6_addr ipv6route; // Static IPv6 route
321 char reserved_3[11]; // Space to expand structure without changing HB_VERSION
322 }
323 sessiont;
324
325 typedef struct
326 {
327 int state; // current state (bundlestate enum)
328 uint32_t seq_num_t; // Sequence Number (transmission)
329 uint32_t timeout; // Session-Timeout for bundle
330 uint32_t max_seq; // Max value of sequence number field
331 uint8_t num_of_links; // Number of links joint to this bundle
332 uint32_t online_time; // The time this bundle is online
333 clockt last_check; // Last time the timeout is checked
334 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
335 uint8_t mssf; // Multilink Short Sequence Number Header Format
336 epdist epdis; // Multilink Endpoint Discriminator
337 char user[MAXUSER]; // Needed for matching member links
338 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
339 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
340 }
341 bundlet;
342
343 typedef struct
344 {
345 fragmentt fragment[MAXFRAGNUM];
346 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
347 uint16_t re_frame_len; // The reassembled frame length
348 uint16_t re_frame_begin_index, re_frame_end_index; // reassembled frame begin index, end index respectively
349 uint16_t start_index, end_index; // start and end sequence numbers available on the fragments array respectively
350 uint32_t M; // Minumum frame sequence number received over all bundle members
351 uint32_t start_seq; // Last received frame sequence number (bearing B bit)
352 }
353 fragmentationt;
354
355 #define AUTHPAP 1 // allow PAP
356 #define AUTHCHAP 2 // allow CHAP
357
358 typedef struct
359 {
360 // packet counters
361 uint32_t pin;
362 uint32_t pout;
363
364 // byte counters
365 uint32_t cin;
366 uint32_t cout;
367
368 // PPP restart timer/counters
369 struct {
370 time_t restart;
371 int conf_sent;
372 int nak_sent;
373 } lcp, ipcp, ipv6cp, ccp;
374
375 // identifier for Protocol-Reject, Code-Reject
376 uint8_t lcp_ident;
377
378 // authentication to use
379 int lcp_authtype;
380
381 // our MRU
382 uint16_t ppp_mru;
383
384 // our MRRU
385 uint16_t mp_mrru;
386
387 // our mssf
388 uint16_t mp_mssf;
389
390 // our Endpoint Discriminator
391 in_addr_t mp_epdis;
392
393 // DoS prevention
394 clockt last_packet_out;
395 uint32_t packets_out;
396 uint32_t packets_dropped;
397
398 // RADIUS session in use
399 uint16_t radius;
400
401 // interim RADIUS
402 time_t last_interim;
403
404 // last LCP Echo
405 time_t last_echo;
406
407 // Last Multilink frame sequence number received
408 uint32_t last_seq;
409 } sessionlocalt;
410
411 // session flags
412 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
413 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
414 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
415
416 // 168 bytes per tunnel
417 typedef struct
418 {
419 tunnelidt far; // far end tunnel ID
420 in_addr_t ip; // Ip for far end
421 uint16_t port; // port for far end
422 uint16_t window; // Rx window
423 uint16_t nr; // next receive
424 uint16_t ns; // next send
425 int state; // current state (tunnelstate enum)
426 clockt last; // when last control message sent (used for resend timeout)
427 clockt retry; // when to try resending pending control
428 clockt die; // being closed, when to finally free
429 clockt lastrec; // when the last control message was received
430 char hostname[128]; // tunnel hostname
431 char vendor[128]; // LAC vendor
432 uint8_t try; // number of retrys on a control message
433 uint16_t controlc; // outstaind messages in queue
434 controlt *controls; // oldest message
435 controlt *controle; // newest message
436 }
437 tunnelt;
438
439 // 164 bytes per radius session
440 typedef struct // outstanding RADIUS requests
441 {
442 sessionidt session; // which session this applies to
443 hasht auth; // request authenticator
444 clockt retry; // when to try next
445 char pass[129]; // password
446 uint8_t id; // ID for PPP response
447 uint8_t try; // which try we are on
448 uint8_t state; // state of radius requests
449 uint8_t chap; // set if CHAP used (is CHAP identifier)
450 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
451 char const *term_msg; // terminate reason
452 }
453 radiust;
454
455 typedef struct
456 {
457 in_addr_t address; // Host byte order..
458 char assigned; // 1 if assigned, 0 if free
459 sessionidt session;
460 clockt last; // last used
461 char user[129]; // user (try to have ip addresses persistent)
462 }
463 ippoolt;
464
465 #ifdef RINGBUFFER
466 struct Tringbuffer
467 {
468 struct {
469 char level;
470 sessionidt session;
471 tunnelidt tunnel;
472 char message[MAX_LOG_LENGTH];
473 } buffer[RINGBUFFER_SIZE];
474 int head;
475 int tail;
476 };
477 #endif
478
479 /*
480 * Possible tunnel states
481 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
482 */
483 enum
484 {
485 TUNNELFREE, // Not in use
486 TUNNELOPEN, // Active tunnel
487 TUNNELDIE, // Currently closing
488 TUNNELOPENING, // Busy opening
489 TUNNELUNDEF, // Undefined
490 };
491
492 enum
493 {
494 BUNDLEFREE, // Not in use
495 BUNDLEOPEN, // Active bundle
496 BUNDLEUNDEF, // Undefined
497 };
498
499 enum
500 {
501 NULLCLASS = 0, //End Point Discriminator classes
502 LOCALADDR,
503 IPADDR,
504 IEEEMACADDR,
505 PPPMAGIC,
506 PSNDN,
507 };
508
509 enum
510 {
511 RADIUSNULL, // Not in use
512 RADIUSCHAP, // sending CHAP down PPP
513 RADIUSAUTH, // sending auth to RADIUS server
514 RADIUSSTART, // sending start accounting to RADIUS server
515 RADIUSSTOP, // sending stop accounting to RADIUS server
516 RADIUSINTERIM, // sending interim accounting to RADIUS server
517 RADIUSWAIT, // waiting timeout before available, in case delayed replies
518 RADIUSJUSTAUTH, // sending auth to RADIUS server, just authentication, no ip assigning
519 };
520
521 struct Tstats
522 {
523 time_t start_time;
524 time_t last_reset;
525
526 uint32_t tun_rx_packets;
527 uint32_t tun_tx_packets;
528 uint32_t tun_rx_bytes;
529 uint32_t tun_tx_bytes;
530 uint32_t tun_rx_errors;
531 uint32_t tun_tx_errors;
532 uint32_t tun_rx_dropped;
533
534 uint32_t tunnel_rx_packets;
535 uint32_t tunnel_tx_packets;
536 uint32_t tunnel_rx_bytes;
537 uint32_t tunnel_tx_bytes;
538 uint32_t tunnel_rx_errors;
539 uint32_t tunnel_tx_errors;
540
541 uint32_t tunnel_retries;
542 uint32_t radius_retries;
543
544 uint32_t arp_sent;
545
546 uint32_t packets_snooped;
547
548 uint32_t tunnel_created;
549 uint32_t session_created;
550 uint32_t tunnel_timeout;
551 uint32_t session_timeout;
552 uint32_t radius_timeout;
553 uint32_t radius_overflow;
554 uint32_t tunnel_overflow;
555 uint32_t session_overflow;
556
557 uint32_t ip_allocated;
558 uint32_t ip_freed;
559
560 uint32_t c_forwarded;
561 uint32_t recv_forward;
562
563 uint32_t select_called;
564 uint32_t multi_read_used;
565 uint32_t multi_read_exceeded;
566
567 #ifdef STATISTICS
568 uint32_t call_processtun;
569 uint32_t call_processipout;
570 uint32_t call_processipv6out;
571 uint32_t call_processudp;
572 uint32_t call_sessionbyip;
573 uint32_t call_sessionbyipv6;
574 uint32_t call_sessionbyuser;
575 uint32_t call_sendarp;
576 uint32_t call_sendipcp;
577 uint32_t call_sendipv6cp;
578 uint32_t call_processipv6cp;
579 uint32_t call_tunnelsend;
580 uint32_t call_sessionkill;
581 uint32_t call_sessionshutdown;
582 uint32_t call_tunnelkill;
583 uint32_t call_tunnelshutdown;
584 uint32_t call_assign_ip_address;
585 uint32_t call_free_ip_address;
586 uint32_t call_dump_acct_info;
587 uint32_t call_sessionsetup;
588 uint32_t call_processpap;
589 uint32_t call_processchap;
590 uint32_t call_processlcp;
591 uint32_t call_processipcp;
592 uint32_t call_processipin;
593 uint32_t call_processipv6in;
594 uint32_t call_processccp;
595 uint32_t call_sendchap;
596 uint32_t call_processrad;
597 uint32_t call_radiussend;
598 uint32_t call_radiusretry;
599 uint32_t call_random_data;
600 #endif
601 };
602
603 #ifdef STATISTICS
604
605 #ifdef STAT_CALLS
606 #define CSTAT(x) STAT(call_ ## x)
607 #else
608 #define CSTAT(x)
609 #endif
610
611 #define STAT(x) (_statistics->x++)
612 #define INC_STAT(x,y) (_statistics->x += (y))
613 #define GET_STAT(x) (_statistics->x)
614 #define SET_STAT(x, y) (_statistics->x = (y))
615 #else
616 #define CSTAT(x)
617 #define STAT(x)
618 #define INC_STAT(x,y)
619 #define GET_STAT(x) 0
620 #define SET_STAT(x, y)
621 #endif
622
623 #ifndef IFNAMSIZ
624 # define IFNAMSIZ 16
625 #endif
626
627 typedef struct
628 {
629 int debug; // debugging level
630 time_t start_time; // time when l2tpns was started
631 char bandwidth[256]; // current bandwidth
632 char pid_file[256]; // file to write PID to on startup
633 int wrote_pid;
634 clockt current_time; // 1/10ths of a second since the process started.
635 // means that we can only run a given process
636 // for 13 years without re-starting!
637
638 char config_file[128];
639 int reload_config; // flag to re-read config (set by cli)
640 int multi_read_count; // amount of packets to read per fd in processing loop
641
642 char tundevice[IFNAMSIZ]; // tun device name
643 char log_filename[128];
644
645 char l2tp_secret[64]; // L2TP shared secret
646 int l2tp_mtu; // MTU of interface used for L2TP
647
648 char random_device[256]; // random device path, defaults to RANDOMDEVICE
649
650 int ppp_restart_time; // timeout for PPP restart
651 int ppp_max_configure; // max lcp configure requests to send
652 int ppp_max_failure; // max lcp configure naks to send
653
654 char radiussecret[64];
655 int radius_accounting;
656 int radius_interim;
657 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
658 uint16_t radiusport[MAXRADSERVER]; // radius base ports
659 uint8_t numradiusservers; // radius server count
660
661 uint16_t radius_dae_port; // port for radius DAE
662 uint16_t radius_bind_min; // port range for udp sockets used to send/recv radius packets
663 uint16_t radius_bind_max;
664
665 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
666 int radius_authtypes;
667 int radius_authprefer;
668
669 int allow_duplicate_users; // allow multiple logins with the same username
670 int kill_timedout_sessions; // kill authenticated sessions with "session_timeout == 0"
671
672 in_addr_t default_dns1, default_dns2;
673
674 unsigned long rl_rate; // default throttle rate
675 int num_tbfs; // number of throttle buckets
676
677 char accounting_dir[128];
678 in_addr_t bind_address;
679 in_addr_t peer_address;
680 int send_garp; // Set to true to garp for vip address on startup
681
682 int dump_speed;
683 char plugins[64][MAXPLUGINS];
684 char old_plugins[64][MAXPLUGINS];
685
686 int next_tbf; // Next HTB id available to use
687 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
688 // policy for this process.
689 int lock_pages; // Lock pages into memory.
690 int icmp_rate; // Max number of ICMP unreachable per second to send
691 int max_packets; // DoS prevention: per session limit of packets/0.1s
692 char epdis_addr[20]; // MP Endpoint Discriminator address
693
694 in_addr_t cluster_address; // Multicast address of cluster.
695 // Send to this address to have everyone hear.
696 char cluster_interface[64]; // Which interface to listen for multicast on.
697 int cluster_iam_master; // Are we the cluster master???
698 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
699 in_addr_t cluster_master_address; // The network address of the cluster master.
700 // Zero if i am the cluster master.
701 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
702 // (or the seq number we're next expecting if we're a slave).
703 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
704 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
705 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
706 int cluster_highest_sessionid;
707 int cluster_highest_bundleid;
708 int cluster_highest_tunnelid;
709 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
710 int cluster_last_hb_ver; // Heartbeat version last seen from master
711 int cluster_num_changes; // Number of changes queued.
712
713 int cluster_mcast_ttl; // TTL for multicast packets
714 int cluster_hb_interval; // How often to send a heartbeat.
715 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
716 uint64_t cluster_table_version; // # state changes processed by cluster
717
718 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
719
720
721 int cluster_master_min_adv; // Master advertises routes while the number of up to date
722 // slaves is less than this value.
723 in_addr_t cli_bind_address; // bind address for CLI
724 char hostname[MAXHOSTNAME]; // hostname (overridden by -h on command line)
725 // Guest change
726 char guest_user[MAXUSER]; // Guest account username
727
728 #ifdef BGP
729 #define BGP_NUM_PEERS 2
730 uint16_t as_number;
731 struct {
732 char name[64];
733 uint16_t as;
734 int keepalive;
735 int hold;
736 struct in_addr update_source;
737 } neighbour[BGP_NUM_PEERS];
738 in_addr_t nexthop_address;
739 struct in6_addr nexthop6_address;
740 #endif
741 } configt;
742
743 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
744 typedef struct
745 {
746 char *key;
747 int offset;
748 int size;
749 enum config_typet type;
750 } config_descriptt;
751
752 typedef struct
753 {
754 uint8_t op; // operation
755 #define FILTER_PORT_OP_NONE 0 // all ports match
756 #define FILTER_PORT_OP_EQ 1
757 #define FILTER_PORT_OP_NEQ 2
758 #define FILTER_PORT_OP_GT 3
759 #define FILTER_PORT_OP_LT 4
760 #define FILTER_PORT_OP_RANGE 5
761 uint16_t port; // port (host byte order)
762 uint16_t port2; // range
763 } ip_filter_portt;
764
765 typedef struct
766 {
767 int action; // permit/deny
768 #define FILTER_ACTION_DENY 1
769 #define FILTER_ACTION_PERMIT 2
770 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
771 in_addr_t src_ip; // source ip (network byte order)
772 in_addr_t src_wild;
773 ip_filter_portt src_ports;
774 in_addr_t dst_ip; // dest ip
775 in_addr_t dst_wild;
776 ip_filter_portt dst_ports;
777 uint8_t frag; // apply to non-initial fragments
778 uint8_t tcp_flag_op; // match type: any, all, established
779 #define FILTER_FLAG_OP_ANY 1
780 #define FILTER_FLAG_OP_ALL 2
781 #define FILTER_FLAG_OP_EST 3
782 uint8_t tcp_sflags; // flags set
783 uint8_t tcp_cflags; // flags clear
784 uint32_t counter; // match count
785 } ip_filter_rulet;
786
787 #define TCP_FLAG_FIN 0x01
788 #define TCP_FLAG_SYN 0x02
789 #define TCP_FLAG_RST 0x04
790 #define TCP_FLAG_PSH 0x08
791 #define TCP_FLAG_ACK 0x10
792 #define TCP_FLAG_URG 0x20
793
794 #define MAXFILTER 32
795 #define MAXFILTER_RULES 32
796 typedef struct
797 {
798 char name[32]; // ACL name
799 int extended; // type: 0 = standard, 1 = extended
800 ip_filter_rulet rules[MAXFILTER_RULES];
801 int used; // session ref count
802 } ip_filtert;
803
804 // CDN result/error codes
805 #define CDN_NONE 0, 0
806 #define CDN_TRY_ANOTHER 2, 7
807 #define CDN_ADMIN_DISC 3, 0
808 #define CDN_UNAVAILABLE 4, 0
809
810 // RADIUS Acct-Terminate-Cause values
811 #define TERM_USER_REQUEST 1
812 #define TERM_LOST_CARRIER 2
813 #define TERM_LOST_SERVICE 3
814 #define TERM_IDLE_TIMEOUT 4
815 #define TERM_SESSION_TIMEOUT 5
816 #define TERM_ADMIN_RESET 6
817 #define TERM_ADMIN_REBOOT 7
818 #define TERM_PORT_ERROR 8
819 #define TERM_NAS_ERROR 9
820 #define TERM_NAS_REQUEST 10
821 #define TERM_NAS_REBOOT 11
822 #define TERM_PORT_UNNEEDED 12
823 #define TERM_PORT_PREEMPTED 13
824 #define TERM_PORT_SUSPENDED 14
825 #define TERM_SERVICE_UNAVAILABLE 15
826 #define TERM_CALLBACK 16
827 #define TERM_USER_ERROR 17
828 #define TERM_HOST_REQUEST 18
829 #define TERM_SUPPLICANT_RESTART 19
830 #define TERM_REAUTHENTICATION_FAILURE 20
831 #define TERM_PORT_REINIT 21
832 #define TERM_PORT_DISABLED 22
833
834 // arp.c
835 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
836
837
838 // ppp.c
839 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
840 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
841 void lcp_open(sessionidt s, tunnelidt t);
842 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
843 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
844 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
845 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
846 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
847 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
848 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
849 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
850 void sendchap(sessionidt s, tunnelidt t);
851 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);
852 void sendlcp(sessionidt s, tunnelidt t);
853 void send_ipin(sessionidt s, uint8_t *buf, int len);
854 void sendccp(sessionidt s, tunnelidt t);
855 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
856 int join_bundle(sessionidt s);
857
858
859 // radius.c
860 void initrad(void);
861 void radiussend(uint16_t r, uint8_t state);
862 void processrad(uint8_t *buf, int len, char socket_index);
863 void radiusretry(uint16_t r);
864 uint16_t radiusnew(sessionidt s);
865 void radiusclear(uint16_t r, sessionidt s);
866 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
867
868
869 // l2tpns.c
870 clockt backoff(uint8_t try);
871 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
872 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
873 sessionidt sessionbyip(in_addr_t ip);
874 sessionidt sessionbyipv6(struct in6_addr ip);
875 sessionidt sessionbyuser(char *username);
876 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
877 void random_data(uint8_t *buf, int len);
878 void sessionkill(sessionidt s, char *reason);
879 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
880 void filter_session(sessionidt s, int filter_in, int filter_out);
881 void send_garp(in_addr_t ip);
882 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
883 int tun_write(uint8_t *data, int size);
884 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
885 void sendipcp(sessionidt s, tunnelidt t);
886 void sendipv6cp(sessionidt s, tunnelidt t);
887 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
888 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
889 int find_filter(char const *name, size_t len);
890 int ip_filter(uint8_t *buf, int len, uint8_t filter);
891 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
892 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
893 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
894
895 #undef LOG
896 #undef LOG_HEX
897 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
898 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
899
900 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
901 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
902
903
904 int sessionsetup(sessionidt s, tunnelidt t);
905 int run_plugins(int plugin_type, void *data);
906 void rebuild_address_pool(void);
907 void throttle_session(sessionidt s, int rate_in, int rate_out);
908 int load_session(sessionidt, sessiont *);
909 void become_master(void); // We're the master; kick off any required master initializations.
910
911
912 // cli.c
913 void init_cli();
914 void cli_init_hostname(char *hostname);
915 void cli_do_file(FILE *fh);
916 void cli_do(int sockfd);
917 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
918
919
920 // icmp.c
921 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
922
923
924 extern tunnelt *tunnel;
925 extern bundlet *bundle;
926 extern sessiont *session;
927 extern sessionlocalt *sess_local;
928 extern ippoolt *ip_address_pool;
929 #define sessionfree (session[0].next)
930
931
932 extern configt *config;
933 extern time_t basetime; // Time when this process started.
934 extern time_t time_now; // Seconds since EPOCH.
935 extern char main_quit;
936 extern uint32_t last_id;
937 extern struct Tstats *_statistics;
938 extern in_addr_t my_address;
939 extern int clifd;
940 extern int epollfd;
941
942 struct event_data {
943 enum {
944 FD_TYPE_CLI,
945 FD_TYPE_CLUSTER,
946 FD_TYPE_TUN,
947 FD_TYPE_UDP,
948 FD_TYPE_CONTROL,
949 FD_TYPE_DAE,
950 FD_TYPE_RADIUS,
951 FD_TYPE_BGP,
952 FD_TYPE_NETLINK,
953 } type;
954 int index; // for RADIUS, BGP
955 };
956
957 #define TIME (config->current_time)
958
959 extern uint16_t MRU;
960 extern uint16_t MSS;
961
962 // macros for handling help in cli commands
963 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
964 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
965
966 // CVS identifiers (for "show version file")
967 extern char const *cvs_id_arp;
968 extern char const *cvs_id_cli;
969 extern char const *cvs_id_cluster;
970 extern char const *cvs_id_constants;
971 extern char const *cvs_id_control;
972 extern char const *cvs_id_icmp;
973 extern char const *cvs_id_l2tpns;
974 extern char const *cvs_id_ll;
975 extern char const *cvs_id_md5;
976 extern char const *cvs_id_ppp;
977 extern char const *cvs_id_radius;
978 extern char const *cvs_id_tbf;
979 extern char const *cvs_id_util;
980
981 #endif /* __L2TPNS_H__ */