48e7b0299296e627ea7f138c1cc4866aebe55454
[l2tpns.git] / l2tpns.h
1 // L2TPNS Global Stuff
2 // $Id: l2tpns.h,v 1.117 2006-06-11 12:46:18 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 uint32_t session_timeout; // Maximum session time in seconds
288 uint32_t idle_timeout; // Maximum idle time in seconds
289 time_t last_packet; // Last packet from the user (used for idle timeouts)
290 time_t last_data; // Last data packet to/from the user (used for idle timeouts)
291 in_addr_t dns1, dns2; // DNS servers
292 routet route[MAXROUTE]; // static routes
293 uint16_t tbf_in; // filter bucket for throttling in from the user.
294 uint16_t tbf_out; // filter bucket for throttling out to the user.
295 int random_vector_length;
296 uint8_t random_vector[MAXTEL];
297 char user[MAXUSER]; // user (needed in seesion for radius stop messages)
298 char called[MAXTEL]; // called number
299 char calling[MAXTEL]; // calling number
300 uint32_t tx_connect_speed;
301 uint32_t rx_connect_speed;
302 clockt timeout; // Session timeout
303 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
304 uint8_t mssf; // Multilink Short Sequence Number Header Format
305 epdist epdis; // Multilink Endpoint Discriminator
306 bundleidt bundle; // Multilink Bundle Identifier
307 in_addr_t snoop_ip; // Interception destination IP
308 uint16_t snoop_port; // Interception destination port
309 uint8_t walled_garden; // is this session gardened?
310 uint8_t ipv6prefixlen; // IPv6 route prefix length
311 struct in6_addr ipv6route; // Static IPv6 route
312 char reserved_3[11]; // Space to expand structure without changing HB_VERSION
313 }
314 sessiont;
315
316 typedef struct
317 {
318 int state; // current state (bundlestate enum)
319 uint32_t seq_num_t; // Sequence Number (transmission)
320 uint32_t seq_num_m; // Last received frame sequence number (bearing B bit)
321 uint32_t offset; // Offset between sequence number and array index
322 uint8_t pending_frag; // Indicate that there is pending fragments to reassemble
323 uint8_t num_of_links; // Number of links joint to this bundle
324 uint32_t online_time; // The time this bundle is online
325 clockt last_check; // Last time the timeout is checked
326 uint32_t mrru; // Multilink Max-Receive-Reconstructed-Unit
327 uint8_t mssf; // Multilink Short Sequence Number Header Format
328 epdist epdis; // Multilink Endpoint Discriminator
329 char user[MAXUSER]; // Needed for matching member links
330 sessionidt current_ses; // Current session to use for sending (used in RR load-balancing)
331 sessionidt members[MAXBUNDLESES]; // Array for member links sessions
332 }
333 bundlet;
334
335 typedef struct
336 {
337 fragmentt fragment[MAXFRAGNUM];
338 uint8_t reassembled_frame[MAXETHER]; // The reassembled frame
339 uint16_t re_frame_len; // The reassembled frame length
340 }
341 fragmentationt;
342
343 #define AUTHPAP 1 // allow PAP
344 #define AUTHCHAP 2 // allow CHAP
345
346 typedef struct
347 {
348 // packet counters
349 uint32_t pin;
350 uint32_t pout;
351
352 // byte counters
353 uint32_t cin;
354 uint32_t cout;
355
356 // PPP restart timer/counters
357 struct {
358 time_t restart;
359 int conf_sent;
360 int nak_sent;
361 } lcp, ipcp, ipv6cp, ccp;
362
363 // identifier for Protocol-Reject, Code-Reject
364 uint8_t lcp_ident;
365
366 // authentication to use
367 int lcp_authtype;
368
369 // our MRU
370 uint16_t ppp_mru;
371
372 // our MRRU
373 uint16_t mp_mrru;
374
375 // our mssf
376 uint16_t mp_mssf;
377
378 // our Endpoint Discriminator
379 in_addr_t mp_epdis;
380
381 // DoS prevention
382 clockt last_packet_out;
383 uint32_t packets_out;
384 uint32_t packets_dropped;
385
386 // RADIUS session in use
387 uint16_t radius;
388
389 // interim RADIUS
390 time_t last_interim;
391
392 // last LCP Echo
393 time_t last_echo;
394 } sessionlocalt;
395
396 // session flags
397 #define SESSION_PFC (1 << 0) // use Protocol-Field-Compression
398 #define SESSION_ACFC (1 << 1) // use Address-and-Control-Field-Compression
399 #define SESSION_STARTED (1 << 2) // RADIUS Start record sent
400
401 // 168 bytes per tunnel
402 typedef struct
403 {
404 tunnelidt far; // far end tunnel ID
405 in_addr_t ip; // Ip for far end
406 uint16_t port; // port for far end
407 uint16_t window; // Rx window
408 uint16_t nr; // next receive
409 uint16_t ns; // next send
410 int state; // current state (tunnelstate enum)
411 clockt last; // when last control message sent (used for resend timeout)
412 clockt retry; // when to try resending pending control
413 clockt die; // being closed, when to finally free
414 clockt lastrec; // when the last control message was received
415 char hostname[128]; // tunnel hostname
416 char vendor[128]; // LAC vendor
417 uint8_t try; // number of retrys on a control message
418 uint16_t controlc; // outstaind messages in queue
419 controlt *controls; // oldest message
420 controlt *controle; // newest message
421 }
422 tunnelt;
423
424 // 164 bytes per radius session
425 typedef struct // outstanding RADIUS requests
426 {
427 sessionidt session; // which session this applies to
428 hasht auth; // request authenticator
429 clockt retry; // when to try next
430 char pass[129]; // password
431 uint8_t id; // ID for PPP response
432 uint8_t try; // which try we are on
433 uint8_t state; // state of radius requests
434 uint8_t chap; // set if CHAP used (is CHAP identifier)
435 uint8_t term_cause; // Stop record: Acct-Terminate-Cause
436 char const *term_msg; // terminate reason
437 }
438 radiust;
439
440 typedef struct
441 {
442 in_addr_t address; // Host byte order..
443 char assigned; // 1 if assigned, 0 if free
444 sessionidt session;
445 clockt last; // last used
446 char user[129]; // user (try to have ip addresses persistent)
447 }
448 ippoolt;
449
450 #ifdef RINGBUFFER
451 struct Tringbuffer
452 {
453 struct {
454 char level;
455 sessionidt session;
456 tunnelidt tunnel;
457 char message[MAX_LOG_LENGTH];
458 } buffer[RINGBUFFER_SIZE];
459 int head;
460 int tail;
461 };
462 #endif
463
464 /*
465 * Possible tunnel states
466 * TUNNELFREE -> TUNNELOPEN -> TUNNELDIE -> TUNNELFREE
467 */
468 enum
469 {
470 TUNNELFREE, // Not in use
471 TUNNELOPEN, // Active tunnel
472 TUNNELDIE, // Currently closing
473 TUNNELOPENING, // Busy opening
474 TUNNELUNDEF, // Undefined
475 };
476
477 enum
478 {
479 BUNDLEFREE, // Not in use
480 BUNDLEOPEN, // Active bundle
481 BUNDLEUNDEF, // Undefined
482 };
483
484 enum
485 {
486 NULLCLASS = 0, //End Point Discriminator classes
487 LOCALADDR,
488 IPADDR,
489 IEEEMACADDR,
490 PPPMAGIC,
491 PSNDN,
492 };
493
494 enum
495 {
496 RADIUSNULL, // Not in use
497 RADIUSCHAP, // sending CHAP down PPP
498 RADIUSAUTH, // sending auth to RADIUS server
499 RADIUSSTART, // sending start accounting to RADIUS server
500 RADIUSSTOP, // sending stop accounting to RADIUS server
501 RADIUSINTERIM, // sending interim accounting to RADIUS server
502 RADIUSWAIT, // waiting timeout before available, in case delayed replies
503 };
504
505 struct Tstats
506 {
507 time_t start_time;
508 time_t last_reset;
509
510 uint32_t tun_rx_packets;
511 uint32_t tun_tx_packets;
512 uint32_t tun_rx_bytes;
513 uint32_t tun_tx_bytes;
514 uint32_t tun_rx_errors;
515 uint32_t tun_tx_errors;
516 uint32_t tun_rx_dropped;
517
518 uint32_t tunnel_rx_packets;
519 uint32_t tunnel_tx_packets;
520 uint32_t tunnel_rx_bytes;
521 uint32_t tunnel_tx_bytes;
522 uint32_t tunnel_rx_errors;
523 uint32_t tunnel_tx_errors;
524
525 uint32_t tunnel_retries;
526 uint32_t radius_retries;
527
528 uint32_t arp_sent;
529
530 uint32_t packets_snooped;
531
532 uint32_t tunnel_created;
533 uint32_t session_created;
534 uint32_t tunnel_timeout;
535 uint32_t session_timeout;
536 uint32_t radius_timeout;
537 uint32_t radius_overflow;
538 uint32_t tunnel_overflow;
539 uint32_t session_overflow;
540
541 uint32_t ip_allocated;
542 uint32_t ip_freed;
543
544 uint32_t c_forwarded;
545 uint32_t recv_forward;
546
547 uint32_t select_called;
548 uint32_t multi_read_used;
549 uint32_t multi_read_exceeded;
550
551 #ifdef STATISTICS
552 uint32_t call_processtun;
553 uint32_t call_processipout;
554 uint32_t call_processipv6out;
555 uint32_t call_processudp;
556 uint32_t call_sessionbyip;
557 uint32_t call_sessionbyipv6;
558 uint32_t call_sessionbyuser;
559 uint32_t call_sendarp;
560 uint32_t call_sendipcp;
561 uint32_t call_sendipv6cp;
562 uint32_t call_processipv6cp;
563 uint32_t call_tunnelsend;
564 uint32_t call_sessionkill;
565 uint32_t call_sessionshutdown;
566 uint32_t call_tunnelkill;
567 uint32_t call_tunnelshutdown;
568 uint32_t call_assign_ip_address;
569 uint32_t call_free_ip_address;
570 uint32_t call_dump_acct_info;
571 uint32_t call_sessionsetup;
572 uint32_t call_processpap;
573 uint32_t call_processchap;
574 uint32_t call_processlcp;
575 uint32_t call_processipcp;
576 uint32_t call_processipin;
577 uint32_t call_processipv6in;
578 uint32_t call_processccp;
579 uint32_t call_sendchap;
580 uint32_t call_processrad;
581 uint32_t call_radiussend;
582 uint32_t call_radiusretry;
583 uint32_t call_random_data;
584 #endif
585 };
586
587 #ifdef STATISTICS
588
589 #ifdef STAT_CALLS
590 #define CSTAT(x) STAT(call_ ## x)
591 #else
592 #define CSTAT(x)
593 #endif
594
595 #define STAT(x) (_statistics->x++)
596 #define INC_STAT(x,y) (_statistics->x += (y))
597 #define GET_STAT(x) (_statistics->x)
598 #define SET_STAT(x, y) (_statistics->x = (y))
599 #else
600 #define CSTAT(x)
601 #define STAT(x)
602 #define INC_STAT(x,y)
603 #define GET_STAT(x) 0
604 #define SET_STAT(x, y)
605 #endif
606
607 typedef struct
608 {
609 int debug; // debugging level
610 time_t start_time; // time when l2tpns was started
611 char bandwidth[256]; // current bandwidth
612 char pid_file[256]; // file to write PID to on startup
613 int wrote_pid;
614 clockt current_time; // 1/10ths of a second since the process started.
615 // means that we can only run a given process
616 // for 13 years without re-starting!
617
618 char config_file[128];
619 int reload_config; // flag to re-read config (set by cli)
620 int multi_read_count; // amount of packets to read per fd in processing loop
621
622 char tundevice[10]; // tun device name
623 char log_filename[128];
624
625 char l2tp_secret[64]; // L2TP shared secret
626 int l2tp_mtu; // MTU of interface used for L2TP
627
628 char random_device[256]; // random device path, defaults to RANDOMDEVICE
629
630 int ppp_restart_time; // timeout for PPP restart
631 int ppp_max_configure; // max lcp configure requests to send
632 int ppp_max_failure; // max lcp configure naks to send
633
634 char radiussecret[64];
635 int radius_accounting;
636 int radius_interim;
637 in_addr_t radiusserver[MAXRADSERVER]; // radius servers
638 uint16_t radiusport[MAXRADSERVER]; // radius base ports
639 uint8_t numradiusservers; // radius server count
640
641 uint16_t radius_dae_port; // local port for radius dae
642
643 char radius_authtypes_s[32]; // list of valid authentication types (chap, pap) in order of preference
644 int radius_authtypes;
645 int radius_authprefer;
646
647 int allow_duplicate_users; // allow multiple logins with the same username
648 char guest_user[MAXUSER]; // allow multiple logins to guest account username
649
650 in_addr_t default_dns1, default_dns2;
651
652 unsigned long rl_rate; // default throttle rate
653 int num_tbfs; // number of throttle buckets
654
655 char accounting_dir[128];
656 in_addr_t bind_address;
657 in_addr_t peer_address;
658 int send_garp; // Set to true to garp for vip address on startup
659
660 int dump_speed;
661 char plugins[64][MAXPLUGINS];
662 char old_plugins[64][MAXPLUGINS];
663
664 int next_tbf; // Next HTB id available to use
665 int scheduler_fifo; // If the system has multiple CPUs, use FIFO scheduling
666 // policy for this process.
667 int lock_pages; // Lock pages into memory.
668 int icmp_rate; // Max number of ICMP unreachable per second to send
669 int max_packets; // DoS prevention: per session limit of packets/0.1s
670 char epdis_addr[20]; // MP Endpoint Discriminator address
671
672 in_addr_t cluster_address; // Multicast address of cluster.
673 // Send to this address to have everyone hear.
674 char cluster_interface[64]; // Which interface to listen for multicast on.
675 int cluster_iam_master; // Are we the cluster master???
676 int cluster_iam_uptodate; // Set if we've got a full set of state from the master.
677 in_addr_t cluster_master_address; // The network address of the cluster master.
678 // Zero if i am the cluster master.
679 int cluster_seq_number; // Sequence number of the next heartbeat we'll send out
680 // (or the seq number we're next expecting if we're a slave).
681 int cluster_undefined_sessions; // How many sessions we're yet to receive from the master.
682 int cluster_undefined_bundles; // How many bundles we're yet to receive from the master.
683 int cluster_undefined_tunnels; // How many tunnels we're yet to receive from the master.
684 int cluster_highest_sessionid;
685 int cluster_highest_bundleid;
686 int cluster_highest_tunnelid;
687 clockt cluster_last_hb; // Last time we saw a heartbeat from the master.
688 int cluster_last_hb_ver; // Heartbeat version last seen from master
689 int cluster_num_changes; // Number of changes queued.
690
691 int cluster_mcast_ttl; // TTL for multicast packets
692 int cluster_hb_interval; // How often to send a heartbeat.
693 int cluster_hb_timeout; // How many missed heartbeats trigger an election.
694 uint64_t cluster_table_version; // # state changes processed by cluster
695 int cluster_master_min_adv; // Master advertises routes while the number of up to date
696 // slaves is less than this value.
697
698 struct in6_addr ipv6_prefix; // Our IPv6 network pool.
699
700 #ifdef BGP
701 #define BGP_NUM_PEERS 2
702 uint16_t as_number;
703 struct {
704 char name[64];
705 uint16_t as;
706 int keepalive;
707 int hold;
708 } neighbour[BGP_NUM_PEERS];
709 #endif
710 } configt;
711
712 enum config_typet { INT, STRING, UNSIGNED_LONG, SHORT, BOOL, IPv4, IPv6 };
713 typedef struct
714 {
715 char *key;
716 int offset;
717 int size;
718 enum config_typet type;
719 } config_descriptt;
720
721 typedef struct
722 {
723 uint8_t op; // operation
724 #define FILTER_PORT_OP_NONE 0 // all ports match
725 #define FILTER_PORT_OP_EQ 1
726 #define FILTER_PORT_OP_NEQ 2
727 #define FILTER_PORT_OP_GT 3
728 #define FILTER_PORT_OP_LT 4
729 #define FILTER_PORT_OP_RANGE 5
730 uint16_t port; // port (host byte order)
731 uint16_t port2; // range
732 } ip_filter_portt;
733
734 typedef struct
735 {
736 int action; // permit/deny
737 #define FILTER_ACTION_DENY 1
738 #define FILTER_ACTION_PERMIT 2
739 uint8_t proto; // protocol: IPPROTO_* (netinet/in.h)
740 in_addr_t src_ip; // source ip (network byte order)
741 in_addr_t src_wild;
742 ip_filter_portt src_ports;
743 in_addr_t dst_ip; // dest ip
744 in_addr_t dst_wild;
745 ip_filter_portt dst_ports;
746 uint8_t frag; // apply to non-initial fragments
747 uint8_t tcp_flag_op; // match type: any, all, established
748 #define FILTER_FLAG_OP_ANY 1
749 #define FILTER_FLAG_OP_ALL 2
750 #define FILTER_FLAG_OP_EST 3
751 uint8_t tcp_sflags; // flags set
752 uint8_t tcp_cflags; // flags clear
753 uint32_t counter; // match count
754 } ip_filter_rulet;
755
756 #define TCP_FLAG_FIN 0x01
757 #define TCP_FLAG_SYN 0x02
758 #define TCP_FLAG_RST 0x04
759 #define TCP_FLAG_PSH 0x08
760 #define TCP_FLAG_ACK 0x10
761 #define TCP_FLAG_URG 0x20
762
763 #define MAXFILTER 32
764 #define MAXFILTER_RULES 32
765 typedef struct
766 {
767 char name[32]; // ACL name
768 int extended; // type: 0 = standard, 1 = extended
769 ip_filter_rulet rules[MAXFILTER_RULES];
770 int used; // session ref count
771 } ip_filtert;
772
773 // CDN result/error codes
774 #define CDN_NONE 0, 0
775 #define CDN_TRY_ANOTHER 2, 7
776 #define CDN_ADMIN_DISC 3, 0
777 #define CDN_UNAVAILABLE 4, 0
778
779 // RADIUS Acct-Terminate-Cause values
780 #define TERM_USER_REQUEST 1
781 #define TERM_LOST_CARRIER 2
782 #define TERM_LOST_SERVICE 3
783 #define TERM_IDLE_TIMEOUT 4
784 #define TERM_SESSION_TIMEOUT 5
785 #define TERM_ADMIN_RESET 6
786 #define TERM_ADMIN_REBOOT 7
787 #define TERM_PORT_ERROR 8
788 #define TERM_NAS_ERROR 9
789 #define TERM_NAS_REQUEST 10
790 #define TERM_NAS_REBOOT 11
791 #define TERM_PORT_UNNEEDED 12
792 #define TERM_PORT_PREEMPTED 13
793 #define TERM_PORT_SUSPENDED 14
794 #define TERM_SERVICE_UNAVAILABLE 15
795 #define TERM_CALLBACK 16
796 #define TERM_USER_ERROR 17
797 #define TERM_HOST_REQUEST 18
798 #define TERM_SUPPLICANT_RESTART 19
799 #define TERM_REAUTHENTICATION_FAILURE 20
800 #define TERM_PORT_REINIT 21
801 #define TERM_PORT_DISABLED 22
802
803 // arp.c
804 void sendarp(int ifr_idx, const unsigned char* mac, in_addr_t ip);
805
806
807 // ppp.c
808 void processpap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
809 void processchap(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
810 void lcp_open(sessionidt s, tunnelidt t);
811 void processlcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
812 void processipcp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
813 void processipv6cp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
814 void processipin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
815 void processmpin(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
816 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra);
817 void processipv6in(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
818 void processccp(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l);
819 void sendchap(sessionidt s, tunnelidt t);
820 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);
821 void sendlcp(sessionidt s, tunnelidt t);
822 void send_ipin(sessionidt s, uint8_t *buf, int len);
823 void sendccp(sessionidt s, tunnelidt t);
824 void protoreject(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint16_t proto);
825 int join_bundle(sessionidt s);
826
827
828 // radius.c
829 void initrad(void);
830 void radiussend(uint16_t r, uint8_t state);
831 void processrad(uint8_t *buf, int len, char socket_index);
832 void radiusretry(uint16_t r);
833 uint16_t radiusnew(sessionidt s);
834 void radiusclear(uint16_t r, sessionidt s);
835 void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
836
837
838 // l2tpns.c
839 clockt backoff(uint8_t try);
840 void send_ipv6_ra(sessionidt s, tunnelidt t, struct in6_addr *ip);
841 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add);
842 sessionidt sessionbyip(in_addr_t ip);
843 sessionidt sessionbyipv6(struct in6_addr ip);
844 sessionidt sessionbyuser(char *username);
845 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta);
846 void random_data(uint8_t *buf, int len);
847 void sessionkill(sessionidt s, char *reason);
848 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause);
849 void filter_session(sessionidt s, int filter_in, int filter_out);
850 void send_garp(in_addr_t ip);
851 void tunnelsend(uint8_t *buf, uint16_t l, tunnelidt t);
852 int tun_write(uint8_t *data, int size);
853 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp);
854 void sendipcp(sessionidt s, tunnelidt t);
855 void sendipv6cp(sessionidt s, tunnelidt t);
856 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr);
857 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port);
858 int find_filter(char const *name, size_t len);
859 int ip_filter(uint8_t *buf, int len, uint8_t filter);
860 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc);
861 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc);
862 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc);
863
864 #undef LOG
865 #undef LOG_HEX
866 #define LOG(D, s, t, f, ...) ({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
867 #define LOG_HEX(D, t, d, s) ({ if (D <= config->debug) _log_hex(D, t, d, s); })
868
869 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
870 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);
871
872
873 int sessionsetup(sessionidt s, tunnelidt t);
874 int run_plugins(int plugin_type, void *data);
875 void rebuild_address_pool(void);
876 void throttle_session(sessionidt s, int rate_in, int rate_out);
877 int load_session(sessionidt, sessiont *);
878 void become_master(void); // We're the master; kick off any required master initializations.
879
880
881 // cli.c
882 void init_cli(char *hostname);
883 void cli_do_file(FILE *fh);
884 void cli_do(int sockfd);
885 int cli_arg_help(struct cli_def *cli, int cr_ok, char *entry, ...);
886
887
888 // icmp.c
889 void host_unreachable(in_addr_t destination, uint16_t id, in_addr_t source, uint8_t *packet, int packet_len);
890
891
892 extern tunnelt *tunnel;
893 extern bundlet *bundle;
894 extern sessiont *session;
895 extern sessionlocalt *sess_local;
896 extern ippoolt *ip_address_pool;
897 #define sessionfree (session[0].next)
898
899
900 extern configt *config;
901 extern time_t basetime; // Time when this process started.
902 extern time_t time_now; // Seconds since EPOCH.
903 extern char main_quit;
904 extern uint32_t last_id;
905 extern struct Tstats *_statistics;
906 extern in_addr_t my_address;
907 extern int clifd;
908 extern int epollfd;
909
910 struct event_data {
911 enum {
912 FD_TYPE_CLI,
913 FD_TYPE_CLUSTER,
914 FD_TYPE_TUN,
915 FD_TYPE_UDP,
916 FD_TYPE_CONTROL,
917 FD_TYPE_DAE,
918 FD_TYPE_RADIUS,
919 FD_TYPE_BGP,
920 } type;
921 int index; // for RADIUS, BGP
922 };
923
924 #define TIME (config->current_time)
925
926 extern uint16_t MRU;
927 extern uint16_t MSS;
928
929 // macros for handling help in cli commands
930 #define CLI_HELP_REQUESTED (argc > 0 && argv[argc-1][strlen(argv[argc-1])-1] == '?')
931 #define CLI_HELP_NO_ARGS (argc > 1 || argv[0][1]) ? CLI_OK : cli_arg_help(cli, 1, NULL)
932
933 // CVS identifiers (for "show version file")
934 extern char const *cvs_id_arp;
935 extern char const *cvs_id_cli;
936 extern char const *cvs_id_cluster;
937 extern char const *cvs_id_constants;
938 extern char const *cvs_id_control;
939 extern char const *cvs_id_icmp;
940 extern char const *cvs_id_l2tpns;
941 extern char const *cvs_id_ll;
942 extern char const *cvs_id_md5;
943 extern char const *cvs_id_ppp;
944 extern char const *cvs_id_radius;
945 extern char const *cvs_id_tbf;
946 extern char const *cvs_id_util;
947
948 #endif /* __L2TPNS_H__ */