e463b1eb72c4dec10462b896d5a5a1da03983cdb
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.115 2006/04/27 09:53:50 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 10 // Maximum number of member links in bundle
23 #define MAXADDRESS 20 // Maximum length for the Endpoint Discrminiator address
24 #define MAXFRAGNUM 1500 // Maximum number of Multilink fragment in a bundle
25 #define MAXFRAGLEN 1000 // Maximum length for Multilink fragment
26 #define MAXSESSION 60000 // could be up to 65535
27 #define MAXTBFS 6000 // Maximum token bucket filters. Might need up to 2 * session.
28
29 #define RADIUS_SHIFT 6
30 #define RADIUS_FDS (1 << RADIUS_SHIFT)
31 #define RADIUS_MASK ((1 << RADIUS_SHIFT) - 1)
32 #define MAXRADIUS (1 << (8 + RADIUS_SHIFT))
33
34 #define T_UNDEF (0xffff) // A tunnel ID that won't ever be used. Mark session as undefined.
35 #define T_FREE (0) // A tunnel ID that won't ever be used. Mark session as free.
36
37 #define MAXCONTROL 1000 // max length control message we ever send...
38 #define MINMTU 576 // minimum recommended MTU (rfc1063)
39 #define MAXMTU 2600 // arbitrary maximum MTU
40 #define PPPoE_MRU 1492 // maximum PPPoE MRU (rfc2516: 1500 less PPPoE header (6) and PPP protocol ID (2))
41 #define MAXETHER (MAXMTU+18) // max packet we try sending to tun
42 #define MAXTEL 96 // telephone number
43 #define MAXUSER 128 // username
44 #define MAXPASS 128 // password
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 sent and LCP ECHO generation
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 DEFAULT_EPDIS_ADDRESS "L2TPNetServer" // Company name may goes here!
60
61 // Constants
62 #ifndef ETCDIR
63 #define ETCDIR "/etc/l2tpns"
64 #endif
65
66 #ifndef LIBDIR
67 #define LIBDIR "/usr/lib/l2tpns"
68 #endif
69
70 #ifndef PLUGINDIR
71 #define PLUGINDIR LIBDIR // Plugins
72 #endif
73
74 #ifndef PLUGINCONF
75 #define PLUGINCONF ETCDIR // Plugin config dir
76 #endif
77
78 #ifndef FLASHDIR
79 #define FLASHDIR ETCDIR
80 #endif
81
82 #define TUNDEVICE "/dev/net/tun"
83 #define RANDOMDEVICE "/dev/urandom" // default, not as secure as /dev/random but non-blocking
84 #define CONFIGFILE FLASHDIR "/startup-config" // Configuration file
85 #define CLIUSERS FLASHDIR "/users" // CLI Users file
86 #define IPPOOLFILE FLASHDIR "/ip_pool" // Address pool configuration
87 #define ACCT_TIME 3000 // 5 minute accounting interval
88 #define ACCT_SHUT_TIME 600 // 1 minute for counters of shutdown sessions
89 #define L2TPPORT 1701 // L2TP port
90 #define RADPORT 1645 // old radius port...
91 #define DAEPORT 3799 // DAE port
92 #define PKTARP 0x0806 // ARP packet type
93 #define PKTIP 0x0800 // IPv4 packet type
94 #define PKTIPV6 0x86DD // IPv6 packet type
95 #define PPPPAP 0xC023
96 #define PPPCHAP 0xC223
97 #define PPPLCP 0xC021
98 #define PPPIPCP 0x8021
99 #define PPPIPV6CP 0x8057
100 #define PPPCCP 0x80FD
101 #define PPPIP 0x0021
102 #define PPPIPV6 0x0057
103 #define PPPMP 0x003D
104 #define MIN_IP_SIZE 0x19
105
106 enum {
107 ConfigReq = 1,
108 ConfigAck,
109 ConfigNak,
110 ConfigRej,
111 TerminateReq,
112 TerminateAck,
113 CodeRej,
114 ProtocolRej,
115 EchoReq,
116 EchoReply,
117 DiscardRequest,
118 IdentRequest
119 };
120
121 enum {
122 AccessRequest = 1,
123 AccessAccept,
124 AccessReject,
125 AccountingRequest,
126 AccountingResponse,
127 AccessChallenge = 11,
128 DisconnectRequest = 40,
129 DisconnectACK,
130 DisconnectNAK,
131 CoARequest,
132 CoAACK,
133 CoANAK
134 };
135
136 // PPP phases
137 enum {
138 Dead,
139 Establish,
140 Authenticate,
141 Network,
142 Terminate
143 };
144
145 // PPP states
146 enum {
147 Initial,
148 Starting,
149 Closed,
150 Stopped,
151 Closing,
152 Stopping,
153 RequestSent,
154 AckReceived,
155 AckSent,
156 Opened
157 };
158
159 // reset state machine counters
160 #define initialise_restart_count(_s, _fsm) \
161 sess_local[_s]._fsm.conf_sent = \
162 sess_local[_s]._fsm.nak_sent = 0
163
164 // no more attempts
165 #define zero_restart_count(_s, _fsm) ({ \
166 sess_local[_s]._fsm.conf_sent = \
167 config->ppp_max_configure; \
168 sess_local[_s]._fsm.restart = \
169 time_now + config->ppp_restart_time; \
170 })
171
172 // increment ConfReq counter and reset timer
173 #define restart_timer(_s, _fsm) ({ \
174 sess_local[_s]._fsm.conf_sent++; \
175 sess_local[_s]._fsm.restart = \
176 time_now + config->ppp_restart_time; \
177 })
178
179 // stop timer on change to state where timer does not run
180 #define change_state(_s, _fsm, _new) ({ \
181 if (_new != session[_s].ppp._fsm) \
182 { \
183 switch (_new) \
184 { \
185 case Initial: \
186 case Starting: \
187 case Closed: \
188 case Stopped: \
189 case Opened: \
190 sess_local[_s]._fsm.restart = 0; \
191 initialise_restart_count(_s, _fsm); \
192 } \
193 session[_s].ppp._fsm = _new; \
194 cluster_send_session(_s); \
195 } \
196 })
197
198 // Types
199 typedef uint16_t sessionidt;
200 typedef uint16_t bundleidt;
201 typedef uint16_t tunnelidt;
202 typedef uint32_t clockt;
203 typedef uint8_t hasht[16];
204
205 // CLI actions
206 struct cli_session_actions {
207 char action;
208 in_addr_t snoop_ip;
209 uint16_t snoop_port;
210 int throttle_in;
211 int throttle_out;
212 int filter_in;
213 int filter_out;
214 };
215
216 #define CLI_SESS_KILL 0x01
217 #define CLI_SESS_SNOOP 0x02
218 #define CLI_SESS_NOSNOOP 0x04
219 #define CLI_SESS_THROTTLE 0x08
220 #define CLI_SESS_NOTHROTTLE 0x10
221 #define CLI_SESS_FILTER 0x20
222 #define CLI_SESS_NOFILTER 0x40
223
224 struct cli_tunnel_actions {
225 char action;
226 };
227
228 #define CLI_TUN_KILL 0x01
229
230 // structures
231 typedef struct // route
232 {
233 in_addr_t ip;
234 in_addr_t mask;
235 }
236 routet;
237
238 typedef struct controls // control message
239 {
240 struct controls *next; // next in queue
241 uint16_t length; // length
242 uint8_t buf[MAXCONTROL];
243 }
244 controlt;
245
246 typedef struct {
247 uint8_t length; // Endpoint Discriminator length
248 uint8_t addr_class; // Endpoint Discriminator class
249 uint8_t address[MAXADDRESS]; // Endpoint Discriminator address
250 } epdist;
251
252 typedef struct {
253 uint16_t length; // Fragment length
254 uint8_t data[MAXFRAGLEN]; // Fragment data
255 } fragmentt;
256
257 typedef struct
258 {
259 sessionidt next; // next session in linked list
260 sessionidt far; // far end session ID
261 tunnelidt tunnel; // near end tunnel ID
262 uint8_t flags; // session flags: see SESSION_*
263 struct {
264 uint8_t phase; // PPP phase
265 uint8_t lcp:4; // LCP state
266 uint8_t ipcp:4; // IPCP state
267 uint8_t ipv6cp:4; // IPV6CP state
268 uint8_t ccp:4; // CCP state
269 } ppp;
270 char reserved_1[2]; // unused: padding
271 in_addr_t ip; // IP of session set by RADIUS response (host byte order).
272 int ip_pool_index; // index to IP pool
273 uint32_t unique_id; // unique session id
274 char reserved_2[4]; // unused: was ns/nr
275 uint32_t magic; // ppp magic number
276 uint32_t pin, pout; // packet counts
277 uint32_t cin, cout; // byte counts
278 uint32_t cin_wrap, cout_wrap; // byte counter wrap count (RADIUS accounting giagawords)
279 uint32_t cin_delta, cout_delta; // byte count changes (for dump_session())
280 uint16_t throttle_in; // upstream throttle rate (kbps)
281 uint16_t throttle_out; // downstream throttle rate
282 uint8_t filter_in; // input filter index (to ip_filters[N-1]; 0 if none)
283 uint8_t filter_out; // output filter index
284 uint16_t mru; // maximum receive unit
285 clockt opened; // when started
286 clockt die; // being closed, when to finally free
287 time_t last_packet; // Last packet from the user (used for idle timeouts)
288 in_addr_t dns1, dns2; // DNS servers
289 routet route[MAXROUTE]; // static routes
290 uint16_t tbf_in; // filter bucket for throttling in from the user.
291 uint16_t tbf_out; // filter bucket for throttling out to the user.
292 int random_vector_length;
293 uint8_t random_vector[MAXTEL];
294 char user[MAXUSER]; // user (needed in seesion for radius stop messages)
295 char called[MAXTEL]; // called number
296 char calling[MAXTEL]; // calling number
297 uint32_t tx_connect_speed;
298 uint32_t rx_connect_speed;
299 clockt timeout; // Session timeout
300 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
301 uint8_t mssf; // Multilink Short Sequence Number Header Format
302 epdist epdis; // Multilink Endpoint Discriminator
303 bundleidt bundle; // Multilink Bundle Identifier
304 in_addr_t snoop_ip; // Interception destination IP
305 uint16_t snoop_port; // Interception destination port
306 uint8_t walled_garden; // is this session gardened?
307 uint8_t ipv6prefixlen; // IPv6 route prefix length
308 struct in6_addr ipv6route; // Static IPv6 route
309 char reserved_3[11]; // Space to expand structure without changing HB_VERSION
310 }
311 sessiont;
312
313 typedef struct
314 {
315 int state; // current state (bundlestate enum)
316 uint32_t seq_num_t; // Sequence Number (transmission)
317 uint32_t seq_num_m; // Last received frame sequence number (bearing B bit)
318 uint32_t offset; // Offset between sequence number and array index
319 uint8_t pending_frag; // Indicate that there is pending fragments to reassemble
320 uint8_t num_of_links; // Number of links joint to this bundle
321 uint32_t online_time; // The time this bundle is online
322 clockt last_check; // Last time the timeout is checked
323 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
324 uint8_t mssf; // Multilink Short Sequence Number Header Format
325 epdist epdis; // Multilink Endpoint Discriminator
326 char user[MAXUSER]; // Needed for matching member links
327 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
328 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
329 }
330 bundlet;
331
332 typedef struct
333 {
334 fragmentt fragment[MAXFRAGNUM];
335 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
336 uint16_t re_frame_len; // The reassembled frame length
337 }
338 fragmentationt;
339
340 #define AUTHPAP 1 // allow PAP
341 #define AUTHCHAP 2 // allow CHAP
342
343 typedef struct
344 {
345 // packet counters
346 uint32_t pin;
347 uint32_t pout;
348
349 // byte counters
350 uint32_t cin;
351 uint32_t cout;
352
353 // PPP restart timer/counters
354 struct {
355 time_t restart;
356 int conf_sent;
357 int nak_sent;
358 } lcp, ipcp, ipv6cp, ccp;
359
360 // identifier for Protocol-Reject, Code-Reject
361 uint8_t lcp_ident;
362
363 // authentication to use
364 int lcp_authtype;
365
366 // our MRU
367 uint16_t ppp_mru;
368
369 // our MRRU
370 uint16_t mp_mrru;
371
372 // our mssf
373 uint16_t mp_mssf;
374
375 // our Endpoint Discriminator
376 in_addr_t mp_epdis;
377
378 // DoS prevention
379 clockt last_packet_out;
380 uint32_t packets_out;
381 uint32_t packets_dropped;
382
383 // RADIUS session in use
384 uint16_t radius;
385
386 // interim RADIUS
387 time_t last_interim;
388
389 // last LCP Echo
390 time_t last_echo;
391 } sessionlocalt;
392
393 // session flags
394 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
395 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
396 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
397
398 // 168 bytes per tunnel
399 typedef struct
400 {
401 tunnelidt far; // far end tunnel ID
402 in_addr_t ip; // Ip for far end
403 uint16_t port; // port for far end
404 uint16_t window; // Rx window
405 uint16_t nr; // next receive
406 uint16_t ns; // next send
407 int state; // current state (tunnelstate enum)
408 clockt last; // when last control message sent (used for resend timeout)
409 clockt retry; // when to try resending pending control
410 clockt die; // being closed, when to finally free
411 clockt lastrec; // when the last control message was received
412 char hostname[128]; // tunnel hostname
413 char vendor[128]; // LAC vendor
414 uint8_t try; // number of retrys on a control message
415 uint16_t controlc; // outstaind messages in queue
416 controlt *controls; // oldest message
417 controlt *controle; // newest message
418 }
419 tunnelt;
420
421 // 164 bytes per radius session
422 typedef struct // outstanding RADIUS requests
423 {
424 sessionidt session; // which session this applies to
425 hasht auth; // request authenticator
426 clockt retry; // when to try next
427 char pass[129]; // password
428 uint8_t id; // ID for PPP response
429 uint8_t try; // which try we are on
430 uint8_t state; // state of radius requests
431 uint8_t chap; // set if CHAP used (is CHAP identifier)
432 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
433 char const *term_msg; // terminate reason
434 }
435 radiust;
436
437 typedef struct
438 {
439 in_addr_t address; // Host byte order..
440 char assigned; // 1 if assigned, 0 if free
441 sessionidt session;
442 clockt last; // last used
443 char user[129]; // user (try to have ip addresses persistent)
444 }
445 ippoolt;
446
447 #ifdef RINGBUFFER
448 struct Tringbuffer
449 {
450 struct {
451 char level;
452 sessionidt session;
453 tunnelidt tunnel;
454 char message[MAX_LOG_LENGTH];
455 } buffer[RINGBUFFER_SIZE];
456 int head;
457 int tail;
458 };
459 #endif
460
461 /*
462 * Possible tunnel states
463 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
464 */
465 enum
466 {
467 TUNNELFREE, // Not in use
468 TUNNELOPEN, // Active tunnel
469 TUNNELDIE, // Currently closing
470 TUNNELOPENING, // Busy opening
471 TUNNELUNDEF, // Undefined
472 };
473
474 enum
475 {
476 BUNDLEFREE, // Not in use
477 BUNDLEOPEN, // Active bundle
478 BUNDLEUNDEF, // Undefined
479 };
480
481 enum
482 {
483 NULLCLASS = 0, //End Point Discriminator classes
484 LOCALADDR,
485 IPADDR,
486 IEEEMACADDR,
487 PPPMAGIC,
488 PSNDN,
489 };
490
491 enum
492 {
493 RADIUSNULL, // Not in use
494 RADIUSCHAP, // sending CHAP down PPP
495 RADIUSAUTH, // sending auth to RADIUS server
496 RADIUSSTART, // sending start accounting to RADIUS server
497 RADIUSSTOP, // sending stop accounting to RADIUS server
498 RADIUSINTERIM, // sending interim accounting to RADIUS server
499 RADIUSWAIT, // waiting timeout before available, in case delayed replies
500 };
501
502 struct Tstats
503 {
504 time_t start_time;
505 time_t last_reset;
506
507 uint32_t tun_rx_packets;
508 uint32_t tun_tx_packets;
509 uint32_t tun_rx_bytes;
510 uint32_t tun_tx_bytes;
511 uint32_t tun_rx_errors;
512 uint32_t tun_tx_errors;
513 uint32_t tun_rx_dropped;
514
515 uint32_t tunnel_rx_packets;
516 uint32_t tunnel_tx_packets;
517 uint32_t tunnel_rx_bytes;
518 uint32_t tunnel_tx_bytes;
519 uint32_t tunnel_rx_errors;
520 uint32_t tunnel_tx_errors;
521
522 uint32_t tunnel_retries;
523 uint32_t radius_retries;
524
525 uint32_t arp_sent;
526
527 uint32_t packets_snooped;
528
529 uint32_t tunnel_created;
530 uint32_t session_created;
531 uint32_t tunnel_timeout;
532 uint32_t session_timeout;
533 uint32_t radius_timeout;
534 uint32_t radius_overflow;
535 uint32_t tunnel_overflow;
536 uint32_t session_overflow;
537
538 uint32_t ip_allocated;
539 uint32_t ip_freed;
540
541 uint32_t c_forwarded;
542 uint32_t recv_forward;
543
544 uint32_t select_called;
545 uint32_t multi_read_used;
546 uint32_t multi_read_exceeded;
547
548 #ifdef STATISTICS
549 uint32_t call_processtun;
550 uint32_t call_processipout;
551 uint32_t call_processipv6out;
552 uint32_t call_processudp;
553 uint32_t call_sessionbyip;
554 uint32_t call_sessionbyipv6;
555 uint32_t call_sessionbyuser;
556 uint32_t call_sendarp;
557 uint32_t call_sendipcp;
558 uint32_t call_sendipv6cp;
559 uint32_t call_processipv6cp;
560 uint32_t call_tunnelsend;
561 uint32_t call_sessionkill;
562 uint32_t call_sessionshutdown;
563 uint32_t call_tunnelkill;
564 uint32_t call_tunnelshutdown;
565 uint32_t call_assign_ip_address;
566 uint32_t call_free_ip_address;
567 uint32_t call_dump_acct_info;
568 uint32_t call_sessionsetup;
569 uint32_t call_processpap;
570 uint32_t call_processchap;
571 uint32_t call_processlcp;
572 uint32_t call_processipcp;
573 uint32_t call_processipin;
574 uint32_t call_processipv6in;
575 uint32_t call_processccp;
576 uint32_t call_sendchap;
577 uint32_t call_processrad;
578 uint32_t call_radiussend;
579 uint32_t call_radiusretry;
580 uint32_t call_random_data;
581 #endif
582 };
583
584 #ifdef STATISTICS
585
586 #ifdef STAT_CALLS
587 #define CSTAT(x) STAT(call_ ## x)
588 #else
589 #define CSTAT(x)
590 #endif
591
592 #define STAT(x) (_statistics->x++)
593 #define INC_STAT(x,y) (_statistics->x += (y))
594 #define GET_STAT(x) (_statistics->x)
595 #define SET_STAT(x, y) (_statistics->x = (y))
596 #else
597 #define CSTAT(x)
598 #define STAT(x)
599 #define INC_STAT(x,y)
600 #define GET_STAT(x) 0
601 #define SET_STAT(x, y)
602 #endif
603
604 typedef struct
605 {
606 int debug; // debugging level
607 time_t start_time; // time when l2tpns was started
608 char bandwidth[256]; // current bandwidth
609 char pid_file[256]; // file to write PID to on startup
610 int wrote_pid;
611 clockt current_time; // 1/10ths of a second since the process started.
612 // means that we can only run a given process
613 // for 13 years without re-starting!
614
615 char config_file[128];
616 int reload_config; // flag to re-read config (set by cli)
617 int multi_read_count; // amount of packets to read per fd in processing loop
618
619 char tundevice[10]; // tun device name
620 char log_filename[128];
621
622 char l2tp_secret[64]; // L2TP shared secret
623 int l2tp_mtu; // MTU of interface used for L2TP
624
625 char random_device[256]; // random device path, defaults to RANDOMDEVICE
626
627 int ppp_restart_time; // timeout for PPP restart
628 int ppp_max_configure; // max lcp configure requests to send
629 int ppp_max_failure; // max lcp configure naks to send
630
631 char radiussecret[64];
632 int radius_accounting;
633 int radius_interim;
634 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
635 uint16_t radiusport[MAXRADSERVER]; // radius base ports
636 uint8_t numradiusservers; // radius server count
637
638 uint16_t radius_dae_port; // local port for radius dae
639
640 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
641 int radius_authtypes;
642 int radius_authprefer;
643
644 int allow_duplicate_users; // allow multiple logins with the same username
645 char guest_user[MAXUSER]; // allow multiple logins to guest account username
646
647 in_addr_t default_dns1, default_dns2;
648
649 unsigned long rl_rate; // default throttle rate
650 int num_tbfs; // number of throttle buckets
651
652 char accounting_dir[128];
653 in_addr_t bind_address;
654 in_addr_t peer_address;
655 int send_garp; // Set to true to garp for vip address on startup
656
657 int target_uid;
658 int dump_speed;
659 char plugins[64][MAXPLUGINS];
660 char old_plugins[64][MAXPLUGINS];
661
662 int next_tbf; // Next HTB id available to use
663 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
664 // policy for this process.
665 int lock_pages; // Lock pages into memory.
666 int icmp_rate; // Max number of ICMP unreachable per second to send
667 int max_packets; // DoS prevention: per session limit of packets/0.1s
668 char epdis_addr[20]; // MP Endpoint Discriminator address
669
670 in_addr_t cluster_address; // Multicast address of cluster.
671 // Send to this address to have everyone hear.
672 char cluster_interface[64]; // Which interface to listen for multicast on.
673 int cluster_iam_master; // Are we the cluster master???
674 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
675 in_addr_t cluster_master_address; // The network address of the cluster master.
676 // Zero if i am the cluster master.
677 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
678 // (or the seq number we're next expecting if we're a slave).
679 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
680 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
681 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
682 int cluster_highest_sessionid;
683 int cluster_highest_bundleid;
684 int cluster_highest_tunnelid;
685 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
686 int cluster_last_hb_ver; // Heartbeat version last seen from master
687 int cluster_num_changes; // Number of changes queued.
688
689 int cluster_mcast_ttl; // TTL for multicast packets
690 int cluster_hb_interval; // How often to send a heartbeat.
691 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
692 uint64_t cluster_table_version; // # state changes processed by cluster
693 int cluster_master_min_adv; // Master advertises routes while the number of up to date
694 // slaves is less than this value.
695
696 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
697
698 #ifdef BGP
699 #define BGP_NUM_PEERS 2
700 uint16_t as_number;
701 struct {
702 char name[64];
703 uint16_t as;
704 int keepalive;
705 int hold;
706 } neighbour[BGP_NUM_PEERS];
707 #endif
708 } configt;
709
710 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
711 typedef struct
712 {
713 char *key;
714 int offset;
715 int size;
716 enum config_typet type;
717 } config_descriptt;
718
719 typedef struct
720 {
721 uint8_t op; // operation
722 #define FILTER_PORT_OP_NONE 0 // all ports match
723 #define FILTER_PORT_OP_EQ 1
724 #define FILTER_PORT_OP_NEQ 2
725 #define FILTER_PORT_OP_GT 3
726 #define FILTER_PORT_OP_LT 4
727 #define FILTER_PORT_OP_RANGE 5
728 uint16_t port; // port (host byte order)
729 uint16_t port2; // range
730 } ip_filter_portt;
731
732 typedef struct
733 {
734 int action; // permit/deny
735 #define FILTER_ACTION_DENY 1
736 #define FILTER_ACTION_PERMIT 2
737 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
738 in_addr_t src_ip; // source ip (network byte order)
739 in_addr_t src_wild;
740 ip_filter_portt src_ports;
741 in_addr_t dst_ip; // dest ip
742 in_addr_t dst_wild;
743 ip_filter_portt dst_ports;
744 uint8_t frag; // apply to non-initial fragments
745 uint8_t tcp_flag_op; // match type: any, all, established
746 #define FILTER_FLAG_OP_ANY 1
747 #define FILTER_FLAG_OP_ALL 2
748 #define FILTER_FLAG_OP_EST 3
749 uint8_t tcp_sflags; // flags set
750 uint8_t tcp_cflags; // flags clear
751 uint32_t counter; // match count
752 } ip_filter_rulet;
753
754 #define TCP_FLAG_FIN 0x01
755 #define TCP_FLAG_SYN 0x02
756 #define TCP_FLAG_RST 0x04
757 #define TCP_FLAG_PSH 0x08
758 #define TCP_FLAG_ACK 0x10
759 #define TCP_FLAG_URG 0x20
760
761 #define MAXFILTER 32
762 #define MAXFILTER_RULES 32
763 typedef struct
764 {
765 char name[32]; // ACL name
766 int extended; // type: 0 = standard, 1 = extended
767 ip_filter_rulet rules[MAXFILTER_RULES];
768 int used; // session ref count
769 } ip_filtert;
770
771 // CDN result/error codes
772 #define CDN_NONE 0, 0
773 #define CDN_TRY_ANOTHER 2, 7
774 #define CDN_ADMIN_DISC 3, 0
775 #define CDN_UNAVAILABLE 4, 0
776
777 // RADIUS Acct-Terminate-Cause values
778 #define TERM_USER_REQUEST 1
779 #define TERM_LOST_CARRIER 2
780 #define TERM_LOST_SERVICE 3
781 #define TERM_IDLE_TIMEOUT 4
782 #define TERM_SESSION_TIMEOUT 5
783 #define TERM_ADMIN_RESET 6
784 #define TERM_ADMIN_REBOOT 7
785 #define TERM_PORT_ERROR 8
786 #define TERM_NAS_ERROR 9
787 #define TERM_NAS_REQUEST 10
788 #define TERM_NAS_REBOOT 11
789 #define TERM_PORT_UNNEEDED 12
790 #define TERM_PORT_PREEMPTED 13
791 #define TERM_PORT_SUSPENDED 14
792 #define TERM_SERVICE_UNAVAILABLE 15
793 #define TERM_CALLBACK 16
794 #define TERM_USER_ERROR 17
795 #define TERM_HOST_REQUEST 18
796 #define TERM_SUPPLICANT_RESTART 19
797 #define TERM_REAUTHENTICATION_FAILURE 20
798 #define TERM_PORT_REINIT 21
799 #define TERM_PORT_DISABLED 22
800
801 // arp.c
802 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
803
804
805 // ppp.c
806 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
807 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
808 void lcp_open(sessionidt s, tunnelidt t);
809 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
810 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
811 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
812 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
813 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
814 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
815 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
816 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
817 void sendchap(sessionidt s, tunnelidt t);
818 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);
819 void sendlcp(sessionidt s, tunnelidt t);
820 void send_ipin(sessionidt s, uint8_t *buf, int len);
821 void sendccp(sessionidt s, tunnelidt t);
822 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
823 int join_bundle(sessionidt s);
824
825
826 // radius.c
827 void initrad(void);
828 void radiussend(uint16_t r, uint8_t state);
829 void processrad(uint8_t *buf, int len, char socket_index);
830 void radiusretry(uint16_t r);
831 uint16_t radiusnew(sessionidt s);
832 void radiusclear(uint16_t r, sessionidt s);
833 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
834
835
836 // l2tpns.c
837 clockt backoff(uint8_t try);
838 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
839 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
840 sessionidt sessionbyip(in_addr_t ip);
841 sessionidt sessionbyipv6(struct in6_addr ip);
842 sessionidt sessionbyuser(char *username);
843 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
844 void random_data(uint8_t *buf, int len);
845 void sessionkill(sessionidt s, char *reason);
846 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
847 void filter_session(sessionidt s, int filter_in, int filter_out);
848 void send_garp(in_addr_t ip);
849 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
850 int tun_write(uint8_t *data, int size);
851 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
852 void sendipcp(sessionidt s, tunnelidt t);
853 void sendipv6cp(sessionidt s, tunnelidt t);
854 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
855 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
856 int find_filter(char const *name, size_t len);
857 int ip_filter(uint8_t *buf, int len, uint8_t filter);
858 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
859 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
860 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
861
862 #undef LOG
863 #undef LOG_HEX
864 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
865 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
866
867 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
868 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
869
870
871 int sessionsetup(sessionidt s, tunnelidt t);
872 int run_plugins(int plugin_type, void *data);
873 void rebuild_address_pool(void);
874 void throttle_session(sessionidt s, int rate_in, int rate_out);
875 int load_session(sessionidt, sessiont *);
876 void become_master(void); // We're the master; kick off any required master initializations.
877
878
879 // cli.c
880 void init_cli(char *hostname);
881 void cli_do_file(FILE *fh);
882 void cli_do(int sockfd);
883 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
884
885
886 // icmp.c
887 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
888
889
890 extern tunnelt *tunnel;
891 extern bundlet *bundle;
892 extern sessiont *session;
893 extern sessionlocalt *sess_local;
894 extern ippoolt *ip_address_pool;
895 #define sessionfree (session[0].next)
896
897
898 extern configt *config;
899 extern time_t basetime; // Time when this process started.
900 extern time_t time_now; // Seconds since EPOCH.
901 extern char main_quit;
902 extern uint32_t last_id;
903 extern struct Tstats *_statistics;
904 extern in_addr_t my_address;
905 extern int clifd;
906 extern int epollfd;
907
908 struct event_data {
909 enum {
910 FD_TYPE_CLI,
911 FD_TYPE_CLUSTER,
912 FD_TYPE_TUN,
913 FD_TYPE_UDP,
914 FD_TYPE_CONTROL,
915 FD_TYPE_DAE,
916 FD_TYPE_RADIUS,
917 FD_TYPE_BGP,
918 } type;
919 int index; // for RADIUS, BGP
920 };
921
922 #define TIME (config->current_time)
923
924 extern uint16_t MRU;
925 extern uint16_t MSS;
926
927 // macros for handling help in cli commands
928 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
929 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
930
931 // CVS identifiers (for "show version file")
932 extern char const *cvs_id_arp;
933 extern char const *cvs_id_cli;
934 extern char const *cvs_id_cluster;
935 extern char const *cvs_id_constants;
936 extern char const *cvs_id_control;
937 extern char const *cvs_id_icmp;
938 extern char const *cvs_id_l2tpns;
939 extern char const *cvs_id_ll;
940 extern char const *cvs_id_md5;
941 extern char const *cvs_id_ppp;
942 extern char const *cvs_id_radius;
943 extern char const *cvs_id_tbf;
944 extern char const *cvs_id_util;
945
946 #endif /* __L2TPNS_H__ */