9dbde7a7e58954f8e994ae19ec79a6a300e37c70
[l2tpns.git] / l2tpns.c
1 // L2TP Network Server
2 // Adrian Kennard 2002
3 // Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering
4 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
5 // vim: sw=8 ts=8
6
7 #include <arpa/inet.h>
8 #include <assert.h>
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <linux/if_tun.h>
12 #define SYSLOG_NAMES
13 #include <syslog.h>
14 #include <malloc.h>
15 #include <net/route.h>
16 #include <sys/mman.h>
17 #include <netdb.h>
18 #include <netinet/in.h>
19 #include <netinet/ip6.h>
20 #include <stdarg.h>
21 #include <stdlib.h>
22 #include <stdio.h>
23 #include <string.h>
24 #include <ctype.h>
25 #include <sys/ioctl.h>
26 #include <sys/socket.h>
27 #include <sys/stat.h>
28 #include <sys/time.h>
29 #include <sys/resource.h>
30 #include <sys/wait.h>
31 #include <net/if.h>
32 #include <stddef.h>
33 #include <time.h>
34 #include <dlfcn.h>
35 #include <unistd.h>
36 #include <sched.h>
37 #include <sys/sysinfo.h>
38 #include <libcli.h>
39 #include <linux/netlink.h>
40 #include <linux/rtnetlink.h>
41
42 #include "md5.h"
43 #include "l2tpns.h"
44 #include "cluster.h"
45 #include "plugin.h"
46 #include "ll.h"
47 #include "constants.h"
48 #include "control.h"
49 #include "util.h"
50 #include "tbf.h"
51
52 #ifdef BGP
53 #include "bgp.h"
54 #endif
55
56 #ifdef LAC
57 #include "l2tplac.h"
58 #endif
59
60 #ifdef LAC
61 char * Vendor_name = "Linux L2TPNS";
62 uint32_t call_serial_number = 0;
63 #endif
64
65 // Globals
66 configt *config = NULL; // all configuration
67 int nlfd = -1; // netlink socket
68 int tunfd = -1; // tun interface file handle. (network device)
69 int udpfd = -1; // UDP file handle
70 #ifdef LAC
71 int udplacfd = -1; // UDP LAC file handle
72 #endif
73 int controlfd = -1; // Control signal handle
74 int clifd = -1; // Socket listening for CLI connections.
75 int daefd = -1; // Socket listening for DAE connections.
76 int snoopfd = -1; // UDP file handle for sending out intercept data
77 int *radfds = NULL; // RADIUS requests file handles
78 int rand_fd = -1; // Random data source
79 int cluster_sockfd = -1; // Intra-cluster communications socket.
80 int epollfd = -1; // event polling
81 time_t basetime = 0; // base clock
82 char hostname[MAXHOSTNAME] = ""; // us.
83 static int tunidx; // ifr_ifindex of tun device
84 int nlseqnum = 0; // netlink sequence number
85 int min_initok_nlseqnum = 0; // minimun seq number for messages after init is ok
86 static int syslog_log = 0; // are we logging to syslog
87 static FILE *log_stream = 0; // file handle for direct logging (i.e. direct into file, not via syslog).
88 uint32_t last_id = 0; // Unique ID for radius accounting
89 // Guest change
90 char guest_users[10][32]; // Array of guest users
91 int guest_accounts_num = 0; // Number of guest users
92
93 // calculated from config->l2tp_mtu
94 uint16_t MRU = 0; // PPP MRU
95 uint16_t MSS = 0; // TCP MSS
96
97 struct cli_session_actions *cli_session_actions = NULL; // Pending session changes requested by CLI
98 struct cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
99
100 union iphash {
101 sessionidt sess;
102 union iphash *idx;
103 } ip_hash[256]; // Mapping from IP address to session structures.
104
105 struct ipv6radix {
106 sessionidt sess;
107 struct ipv6radix *branch;
108 } ipv6_hash[256]; // Mapping from IPv6 address to session structures.
109
110 // Traffic counters.
111 static uint32_t udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
112 static uint32_t eth_rx = 0, eth_rx_pkt = 0;
113 uint32_t eth_tx = 0;
114
115 static uint32_t ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
116 time_t time_now = 0; // Current time in seconds since epoch.
117 uint64_t time_now_ms = 0; // Current time in milliseconds since epoch.
118 static char time_now_string[64] = {0}; // Current time as a string.
119 static int time_changed = 0; // time_now changed
120 char main_quit = 0; // True if we're in the process of exiting.
121 static char main_reload = 0; // Re-load pending
122 linked_list *loaded_plugins;
123 linked_list *plugins[MAX_PLUGIN_TYPES];
124
125 #define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
126 #define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
127
128 config_descriptt config_values[] = {
129 CONFIG("debug", debug, INT),
130 CONFIG("log_file", log_filename, STRING),
131 CONFIG("pid_file", pid_file, STRING),
132 CONFIG("random_device", random_device, STRING),
133 CONFIG("l2tp_secret", l2tp_secret, STRING),
134 CONFIG("l2tp_mtu", l2tp_mtu, INT),
135 CONFIG("ppp_restart_time", ppp_restart_time, INT),
136 CONFIG("ppp_max_configure", ppp_max_configure, INT),
137 CONFIG("ppp_max_failure", ppp_max_failure, INT),
138 CONFIG("primary_dns", default_dns1, IPv4),
139 CONFIG("secondary_dns", default_dns2, IPv4),
140 CONFIG("primary_radius", radiusserver[0], IPv4),
141 CONFIG("secondary_radius", radiusserver[1], IPv4),
142 CONFIG("primary_radius_port", radiusport[0], SHORT),
143 CONFIG("secondary_radius_port", radiusport[1], SHORT),
144 CONFIG("radius_accounting", radius_accounting, BOOL),
145 CONFIG("radius_interim", radius_interim, INT),
146 CONFIG("radius_secret", radiussecret, STRING),
147 CONFIG("radius_authtypes", radius_authtypes_s, STRING),
148 CONFIG("radius_dae_port", radius_dae_port, SHORT),
149 CONFIG("radius_bind_min", radius_bind_min, SHORT),
150 CONFIG("radius_bind_max", radius_bind_max, SHORT),
151 CONFIG("allow_duplicate_users", allow_duplicate_users, BOOL),
152 CONFIG("kill_timedout_sessions", kill_timedout_sessions, BOOL),
153 CONFIG("guest_account", guest_user, STRING),
154 CONFIG("bind_address", bind_address, IPv4),
155 CONFIG("peer_address", peer_address, IPv4),
156 CONFIG("send_garp", send_garp, BOOL),
157 CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
158 CONFIG("throttle_buckets", num_tbfs, INT),
159 CONFIG("accounting_dir", accounting_dir, STRING),
160 CONFIG("dump_speed", dump_speed, BOOL),
161 CONFIG("multi_read_count", multi_read_count, INT),
162 CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
163 CONFIG("lock_pages", lock_pages, BOOL),
164 CONFIG("icmp_rate", icmp_rate, INT),
165 CONFIG("packet_limit", max_packets, INT),
166 CONFIG("cluster_address", cluster_address, IPv4),
167 CONFIG("cluster_interface", cluster_interface, STRING),
168 CONFIG("cluster_mcast_ttl", cluster_mcast_ttl, INT),
169 CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
170 CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
171 CONFIG("cluster_master_min_adv", cluster_master_min_adv, INT),
172 CONFIG("ipv6_prefix", ipv6_prefix, IPv6),
173 CONFIG("cli_bind_address", cli_bind_address, IPv4),
174 CONFIG("hostname", hostname, STRING),
175 #ifdef BGP
176 CONFIG("nexthop_address", nexthop_address, IPv4),
177 CONFIG("nexthop6_address", nexthop6_address, IPv6),
178 #endif
179 CONFIG("echo_timeout", echo_timeout, INT),
180 CONFIG("idle_echo_timeout", idle_echo_timeout, INT),
181 CONFIG("iftun_address", iftun_address, IPv4),
182 #ifdef LAC
183 CONFIG("disable_lac_func", disable_lac_func, BOOL),
184 CONFIG("bind_address_remotelns", bind_address_remotelns, IPv4),
185 CONFIG("bind_portremotelns", bind_portremotelns, SHORT),
186 #endif
187 { NULL, 0, 0, 0 },
188 };
189
190 static char *plugin_functions[] = {
191 NULL,
192 "plugin_pre_auth",
193 "plugin_post_auth",
194 "plugin_timer",
195 "plugin_new_session",
196 "plugin_kill_session",
197 "plugin_control",
198 "plugin_radius_response",
199 "plugin_radius_reset",
200 "plugin_radius_account",
201 "plugin_become_master",
202 "plugin_new_session_master",
203 };
204
205 #define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
206
207 // Counters for shutdown sessions
208 static sessiont shut_acct[8192];
209 static sessionidt shut_acct_n = 0;
210
211 tunnelt *tunnel = NULL; // Array of tunnel structures.
212 bundlet *bundle = NULL; // Array of bundle structures.
213 fragmentationt *frag = NULL; // Array of fragmentation structures.
214 sessiont *session = NULL; // Array of session structures.
215 sessionlocalt *sess_local = NULL; // Array of local per-session counters.
216 radiust *radius = NULL; // Array of radius structures.
217 ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
218 ip_filtert *ip_filters = NULL; // Array of named filters.
219 static controlt *controlfree = 0;
220 struct Tstats *_statistics = NULL;
221 #ifdef RINGBUFFER
222 struct Tringbuffer *ringbuffer = NULL;
223 #endif
224
225 static ssize_t netlink_send(struct nlmsghdr *nh);
226 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen);
227 static void cache_ipmap(in_addr_t ip, sessionidt s);
228 static void uncache_ipmap(in_addr_t ip);
229 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s);
230 static void free_ip_address(sessionidt s);
231 static void dump_acct_info(int all);
232 static void sighup_handler(int sig);
233 static void shutdown_handler(int sig);
234 static void sigchild_handler(int sig);
235 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response);
236 static void update_config(void);
237 static void read_config_file(void);
238 static void initplugins(void);
239 static int add_plugin(char *plugin_name);
240 static int remove_plugin(char *plugin_name);
241 static void plugins_done(void);
242 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local);
243 static tunnelidt new_tunnel(void);
244 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len);
245 static void bundleclear(bundleidt b);
246
247 // return internal time (10ths since process startup), set f if given
248 // as a side-effect sets time_now, and time_changed
249 static clockt now(double *f)
250 {
251 struct timeval t;
252 gettimeofday(&t, 0);
253 if (f) *f = t.tv_sec + t.tv_usec / 1000000.0;
254 if (t.tv_sec != time_now)
255 {
256 time_now = t.tv_sec;
257 time_changed++;
258 }
259
260 // Time in milliseconds
261 time_now_ms = (t.tv_sec * 1000) + (t.tv_usec/1000);
262
263 return (t.tv_sec - basetime) * 10 + t.tv_usec / 100000 + 1;
264 }
265
266 // work out a retry time based on try number
267 // This is a straight bounded exponential backoff.
268 // Maximum re-try time is 32 seconds. (2^5).
269 clockt backoff(uint8_t try)
270 {
271 if (try > 5) try = 5; // max backoff
272 return now(NULL) + 10 * (1 << try);
273 }
274
275
276 //
277 // Log a debug message. Typically called via the LOG macro
278 //
279 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...)
280 {
281 static char message[65536] = {0};
282 va_list ap;
283
284 #ifdef RINGBUFFER
285 if (ringbuffer)
286 {
287 if (++ringbuffer->tail >= RINGBUFFER_SIZE)
288 ringbuffer->tail = 0;
289 if (ringbuffer->tail == ringbuffer->head)
290 if (++ringbuffer->head >= RINGBUFFER_SIZE)
291 ringbuffer->head = 0;
292
293 ringbuffer->buffer[ringbuffer->tail].level = level;
294 ringbuffer->buffer[ringbuffer->tail].session = s;
295 ringbuffer->buffer[ringbuffer->tail].tunnel = t;
296 va_start(ap, format);
297 vsnprintf(ringbuffer->buffer[ringbuffer->tail].message, MAX_LOG_LENGTH, format, ap);
298 va_end(ap);
299 }
300 #endif
301
302 if (config->debug < level) return;
303
304 va_start(ap, format);
305 vsnprintf(message, sizeof(message), format, ap);
306
307 if (log_stream)
308 fprintf(log_stream, "%s %02d/%02d %s", time_now_string, t, s, message);
309 else if (syslog_log)
310 syslog(level + 2, "%02d/%02d %s", t, s, message); // We don't need LOG_EMERG or LOG_ALERT
311
312 va_end(ap);
313 }
314
315 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize)
316 {
317 int i, j;
318 const uint8_t *d = data;
319
320 if (config->debug < level) return;
321
322 // No support for _log_hex to syslog
323 if (log_stream)
324 {
325 _log(level, 0, 0, "%s (%d bytes):\n", title, maxsize);
326 setvbuf(log_stream, NULL, _IOFBF, 16384);
327
328 for (i = 0; i < maxsize; )
329 {
330 fprintf(log_stream, "%4X: ", i);
331 for (j = i; j < maxsize && j < (i + 16); j++)
332 {
333 fprintf(log_stream, "%02X ", d[j]);
334 if (j == i + 7)
335 fputs(": ", log_stream);
336 }
337
338 for (; j < i + 16; j++)
339 {
340 fputs(" ", log_stream);
341 if (j == i + 7)
342 fputs(": ", log_stream);
343 }
344
345 fputs(" ", log_stream);
346 for (j = i; j < maxsize && j < (i + 16); j++)
347 {
348 if (d[j] >= 0x20 && d[j] < 0x7f && d[j] != 0x20)
349 fputc(d[j], log_stream);
350 else
351 fputc('.', log_stream);
352
353 if (j == i + 7)
354 fputs(" ", log_stream);
355 }
356
357 i = j;
358 fputs("\n", log_stream);
359 }
360
361 fflush(log_stream);
362 setbuf(log_stream, NULL);
363 }
364 }
365
366 // update a counter, accumulating 2^32 wraps
367 void increment_counter(uint32_t *counter, uint32_t *wrap, uint32_t delta)
368 {
369 uint32_t new = *counter + delta;
370 if (new < *counter)
371 (*wrap)++;
372
373 *counter = new;
374 }
375
376 // initialise the random generator
377 static void initrandom(char *source)
378 {
379 static char path[sizeof(config->random_device)] = "*undefined*";
380
381 // reinitialise only if we are forced to do so or if the config has changed
382 if (source && !strncmp(path, source, sizeof(path)))
383 return;
384
385 // close previous source, if any
386 if (rand_fd >= 0)
387 close(rand_fd);
388
389 rand_fd = -1;
390
391 if (source)
392 {
393 // register changes
394 snprintf(path, sizeof(path), "%s", source);
395
396 if (*path == '/')
397 {
398 rand_fd = open(path, O_RDONLY|O_NONBLOCK);
399 if (rand_fd < 0)
400 LOG(0, 0, 0, "Error opening the random device %s: %s\n",
401 path, strerror(errno));
402 }
403 }
404 }
405
406 // fill buffer with random data
407 void random_data(uint8_t *buf, int len)
408 {
409 int n = 0;
410
411 CSTAT(random_data);
412 if (rand_fd >= 0)
413 {
414 n = read(rand_fd, buf, len);
415 if (n >= len) return;
416 if (n < 0)
417 {
418 if (errno != EAGAIN)
419 {
420 LOG(0, 0, 0, "Error reading from random source: %s\n",
421 strerror(errno));
422
423 // fall back to rand()
424 initrandom(NULL);
425 }
426
427 n = 0;
428 }
429 }
430
431 // append missing data
432 while (n < len)
433 // not using the low order bits from the prng stream
434 buf[n++] = (rand() >> 4) & 0xff;
435 }
436
437 // Add a route
438 //
439 // This adds it to the routing table, advertises it
440 // via BGP if enabled, and stuffs it into the
441 // 'sessionbyip' cache.
442 //
443 // 'ip' must be in _host_ order.
444 //
445 static void routeset(sessionidt s, in_addr_t ip, int prefixlen, in_addr_t gw, int add)
446 {
447 struct {
448 struct nlmsghdr nh;
449 struct rtmsg rt;
450 char buf[32];
451 } req;
452 int i;
453 in_addr_t n_ip;
454
455 if (!prefixlen) prefixlen = 32;
456
457 ip &= 0xffffffff << (32 - prefixlen);; // Force the ip to be the first one in the route.
458
459 memset(&req, 0, sizeof(req));
460
461 if (add)
462 {
463 req.nh.nlmsg_type = RTM_NEWROUTE;
464 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
465 }
466 else
467 {
468 req.nh.nlmsg_type = RTM_DELROUTE;
469 req.nh.nlmsg_flags = NLM_F_REQUEST;
470 }
471
472 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
473
474 req.rt.rtm_family = AF_INET;
475 req.rt.rtm_dst_len = prefixlen;
476 req.rt.rtm_table = RT_TABLE_MAIN;
477 req.rt.rtm_protocol = 42;
478 req.rt.rtm_scope = RT_SCOPE_LINK;
479 req.rt.rtm_type = RTN_UNICAST;
480
481 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
482 n_ip = htonl(ip);
483 netlink_addattr(&req.nh, RTA_DST, &n_ip, sizeof(n_ip));
484 if (gw)
485 {
486 n_ip = htonl(gw);
487 netlink_addattr(&req.nh, RTA_GATEWAY, &n_ip, sizeof(n_ip));
488 }
489
490 LOG(1, s, session[s].tunnel, "Route %s %s/%d%s%s\n", add ? "add" : "del",
491 fmtaddr(htonl(ip), 0), prefixlen,
492 gw ? " via" : "", gw ? fmtaddr(htonl(gw), 2) : "");
493
494 if (netlink_send(&req.nh) < 0)
495 LOG(0, 0, 0, "routeset() error in sending netlink message: %s\n", strerror(errno));
496
497 #ifdef BGP
498 if (add)
499 bgp_add_route(htonl(ip), prefixlen);
500 else
501 bgp_del_route(htonl(ip), prefixlen);
502 #endif /* BGP */
503
504 // Add/Remove the IPs to the 'sessionbyip' cache.
505 // Note that we add the zero address in the case of
506 // a network route. Roll on CIDR.
507
508 // Note that 's == 0' implies this is the address pool.
509 // We still cache it here, because it will pre-fill
510 // the malloc'ed tree.
511
512 if (s)
513 {
514 if (!add) // Are we deleting a route?
515 s = 0; // Caching the session as '0' is the same as uncaching.
516
517 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
518 cache_ipmap(i, s);
519 }
520 }
521
522 void route6set(sessionidt s, struct in6_addr ip, int prefixlen, int add)
523 {
524 struct {
525 struct nlmsghdr nh;
526 struct rtmsg rt;
527 char buf[64];
528 } req;
529 int metric;
530 char ipv6addr[INET6_ADDRSTRLEN];
531
532 if (!config->ipv6_prefix.s6_addr[0])
533 {
534 LOG(0, 0, 0, "Asked to set IPv6 route, but IPv6 not setup.\n");
535 return;
536 }
537
538 memset(&req, 0, sizeof(req));
539
540 if (add)
541 {
542 req.nh.nlmsg_type = RTM_NEWROUTE;
543 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE;
544 }
545 else
546 {
547 req.nh.nlmsg_type = RTM_DELROUTE;
548 req.nh.nlmsg_flags = NLM_F_REQUEST;
549 }
550
551 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.rt));
552
553 req.rt.rtm_family = AF_INET6;
554 req.rt.rtm_dst_len = prefixlen;
555 req.rt.rtm_table = RT_TABLE_MAIN;
556 req.rt.rtm_protocol = 42;
557 req.rt.rtm_scope = RT_SCOPE_LINK;
558 req.rt.rtm_type = RTN_UNICAST;
559
560 netlink_addattr(&req.nh, RTA_OIF, &tunidx, sizeof(int));
561 netlink_addattr(&req.nh, RTA_DST, &ip, sizeof(ip));
562 metric = 1;
563 netlink_addattr(&req.nh, RTA_METRICS, &metric, sizeof(metric));
564
565 LOG(1, s, session[s].tunnel, "Route %s %s/%d\n",
566 add ? "add" : "del",
567 inet_ntop(AF_INET6, &ip, ipv6addr, INET6_ADDRSTRLEN),
568 prefixlen);
569
570 if (netlink_send(&req.nh) < 0)
571 LOG(0, 0, 0, "route6set() error in sending netlink message: %s\n", strerror(errno));
572
573 #ifdef BGP
574 if (add)
575 bgp_add_route6(ip, prefixlen);
576 else
577 bgp_del_route6(ip, prefixlen);
578 #endif /* BGP */
579
580 if (s)
581 {
582 if (!add) // Are we deleting a route?
583 s = 0; // Caching the session as '0' is the same as uncaching.
584
585 cache_ipv6map(ip, prefixlen, s);
586 }
587
588 return;
589 }
590
591 //
592 // Set up netlink socket
593 static void initnetlink(void)
594 {
595 struct sockaddr_nl nladdr;
596
597 nlfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
598 if (nlfd < 0)
599 {
600 LOG(0, 0, 0, "Can't create netlink socket: %s\n", strerror(errno));
601 exit(1);
602 }
603
604 memset(&nladdr, 0, sizeof(nladdr));
605 nladdr.nl_family = AF_NETLINK;
606 nladdr.nl_pid = getpid();
607
608 if (bind(nlfd, (struct sockaddr *)&nladdr, sizeof(nladdr)) < 0)
609 {
610 LOG(0, 0, 0, "Can't bind netlink socket: %s\n", strerror(errno));
611 exit(1);
612 }
613 }
614
615 static ssize_t netlink_send(struct nlmsghdr *nh)
616 {
617 struct sockaddr_nl nladdr;
618 struct iovec iov;
619 struct msghdr msg;
620
621 nh->nlmsg_pid = getpid();
622 nh->nlmsg_seq = ++nlseqnum;
623
624 // set kernel address
625 memset(&nladdr, 0, sizeof(nladdr));
626 nladdr.nl_family = AF_NETLINK;
627
628 iov = (struct iovec){ (void *)nh, nh->nlmsg_len };
629 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
630
631 return sendmsg(nlfd, &msg, 0);
632 }
633
634 static ssize_t netlink_recv(void *buf, ssize_t len)
635 {
636 struct sockaddr_nl nladdr;
637 struct iovec iov;
638 struct msghdr msg;
639
640 // set kernel address
641 memset(&nladdr, 0, sizeof(nladdr));
642 nladdr.nl_family = AF_NETLINK;
643
644 iov = (struct iovec){ buf, len };
645 msg = (struct msghdr){ (void *)&nladdr, sizeof(nladdr), &iov, 1, NULL, 0, 0 };
646
647 return recvmsg(nlfd, &msg, 0);
648 }
649
650 /* adapted from iproute2 */
651 static void netlink_addattr(struct nlmsghdr *nh, int type, const void *data, int alen)
652 {
653 int len = RTA_LENGTH(alen);
654 struct rtattr *rta;
655
656 rta = (struct rtattr *)(((void *)nh) + NLMSG_ALIGN(nh->nlmsg_len));
657 rta->rta_type = type;
658 rta->rta_len = len;
659 memcpy(RTA_DATA(rta), data, alen);
660 nh->nlmsg_len = NLMSG_ALIGN(nh->nlmsg_len) + RTA_ALIGN(len);
661 }
662
663 // messages corresponding to different phases seq number
664 static char *tun_nl_phase_msg[] = {
665 "initialized",
666 "getting tun interface index",
667 "setting tun interface parameters",
668 "setting tun IPv4 address",
669 "setting tun LL IPv6 address",
670 "setting tun global IPv6 address",
671 };
672
673 //
674 // Set up TUN interface
675 static void inittun(void)
676 {
677 struct ifreq ifr;
678
679 memset(&ifr, 0, sizeof(ifr));
680 ifr.ifr_flags = IFF_TUN;
681
682 tunfd = open(TUNDEVICE, O_RDWR);
683 if (tunfd < 0)
684 { // fatal
685 LOG(0, 0, 0, "Can't open %s: %s\n", TUNDEVICE, strerror(errno));
686 exit(1);
687 }
688 {
689 int flags = fcntl(tunfd, F_GETFL, 0);
690 fcntl(tunfd, F_SETFL, flags | O_NONBLOCK);
691 }
692 if (ioctl(tunfd, TUNSETIFF, (void *) &ifr) < 0)
693 {
694 LOG(0, 0, 0, "Can't set tun interface: %s\n", strerror(errno));
695 exit(1);
696 }
697 assert(strlen(ifr.ifr_name) < sizeof(config->tundevice) - 1);
698 strncpy(config->tundevice, ifr.ifr_name, sizeof(config->tundevice));
699
700 tunidx = if_nametoindex(config->tundevice);
701 if (tunidx == 0)
702 {
703 LOG(0, 0, 0, "Can't get tun interface index\n");
704 exit(1);
705 }
706
707 {
708 struct {
709 // interface setting
710 struct nlmsghdr nh;
711 union {
712 struct ifinfomsg ifinfo;
713 struct ifaddrmsg ifaddr;
714 } ifmsg;
715 char rtdata[32]; // 32 should be enough
716 } req;
717 uint32_t txqlen, mtu;
718 in_addr_t ip;
719
720 memset(&req, 0, sizeof(req));
721
722 req.nh.nlmsg_type = RTM_NEWLINK;
723 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_MULTI;
724 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifinfo));
725
726 req.ifmsg.ifinfo.ifi_family = AF_UNSPEC;
727 req.ifmsg.ifinfo.ifi_index = tunidx;
728 req.ifmsg.ifinfo.ifi_flags |= IFF_UP; // set interface up
729 req.ifmsg.ifinfo.ifi_change = IFF_UP; // only change this flag
730
731 /* Bump up the qlen to deal with bursts from the network */
732 txqlen = 1000;
733 netlink_addattr(&req.nh, IFLA_TXQLEN, &txqlen, sizeof(txqlen));
734 /* set MTU to modem MRU */
735 mtu = MRU;
736 netlink_addattr(&req.nh, IFLA_MTU, &mtu, sizeof(mtu));
737
738 if (netlink_send(&req.nh) < 0)
739 goto senderror;
740
741 memset(&req, 0, sizeof(req));
742
743 req.nh.nlmsg_type = RTM_NEWADDR;
744 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
745 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
746
747 req.ifmsg.ifaddr.ifa_family = AF_INET;
748 req.ifmsg.ifaddr.ifa_prefixlen = 32;
749 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
750 req.ifmsg.ifaddr.ifa_index = tunidx;
751
752 if (config->iftun_address)
753 ip = config->iftun_address;
754 else
755 ip = 0x01010101; // 1.1.1.1
756 netlink_addattr(&req.nh, IFA_LOCAL, &ip, sizeof(ip));
757
758 if (netlink_send(&req.nh) < 0)
759 goto senderror;
760
761 // Only setup IPv6 on the tun device if we have a configured prefix
762 if (config->ipv6_prefix.s6_addr[0]) {
763 struct in6_addr ip6;
764
765 memset(&req, 0, sizeof(req));
766
767 req.nh.nlmsg_type = RTM_NEWADDR;
768 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
769 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
770
771 req.ifmsg.ifaddr.ifa_family = AF_INET6;
772 req.ifmsg.ifaddr.ifa_prefixlen = 64;
773 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_LINK;
774 req.ifmsg.ifaddr.ifa_index = tunidx;
775
776 // Link local address is FE80::1
777 memset(&ip6, 0, sizeof(ip6));
778 ip6.s6_addr[0] = 0xFE;
779 ip6.s6_addr[1] = 0x80;
780 ip6.s6_addr[15] = 1;
781 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
782
783 if (netlink_send(&req.nh) < 0)
784 goto senderror;
785
786 memset(&req, 0, sizeof(req));
787
788 req.nh.nlmsg_type = RTM_NEWADDR;
789 req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_REPLACE | NLM_F_MULTI;
790 req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.ifmsg.ifaddr));
791
792 req.ifmsg.ifaddr.ifa_family = AF_INET6;
793 req.ifmsg.ifaddr.ifa_prefixlen = 64;
794 req.ifmsg.ifaddr.ifa_scope = RT_SCOPE_UNIVERSE;
795 req.ifmsg.ifaddr.ifa_index = tunidx;
796
797 // Global address is prefix::1
798 ip6 = config->ipv6_prefix;
799 ip6.s6_addr[15] = 1;
800 netlink_addattr(&req.nh, IFA_LOCAL, &ip6, sizeof(ip6));
801
802 if (netlink_send(&req.nh) < 0)
803 goto senderror;
804 }
805
806 memset(&req, 0, sizeof(req));
807
808 req.nh.nlmsg_type = NLMSG_DONE;
809 req.nh.nlmsg_len = NLMSG_LENGTH(0);
810
811 if (netlink_send(&req.nh) < 0)
812 goto senderror;
813
814 // if we get an error for seqnum < min_initok_nlseqnum,
815 // we must exit as initialization went wrong
816 if (config->ipv6_prefix.s6_addr[0])
817 min_initok_nlseqnum = 5 + 1; // idx + if + addr + 2*addr6
818 else
819 min_initok_nlseqnum = 3 + 1; // idx + if + addr
820 }
821
822 return;
823
824 senderror:
825 LOG(0, 0, 0, "Error while setting up tun device: %s\n", strerror(errno));
826 exit(1);
827 }
828
829 // set up UDP ports
830 static void initudp(void)
831 {
832 int on = 1;
833 struct sockaddr_in addr;
834
835 // Tunnel
836 memset(&addr, 0, sizeof(addr));
837 addr.sin_family = AF_INET;
838 addr.sin_port = htons(L2TPPORT);
839 addr.sin_addr.s_addr = config->bind_address;
840 udpfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
841 setsockopt(udpfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
842 {
843 int flags = fcntl(udpfd, F_GETFL, 0);
844 fcntl(udpfd, F_SETFL, flags | O_NONBLOCK);
845 }
846 if (bind(udpfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
847 {
848 LOG(0, 0, 0, "Error in UDP bind: %s\n", strerror(errno));
849 exit(1);
850 }
851
852 // Control
853 memset(&addr, 0, sizeof(addr));
854 addr.sin_family = AF_INET;
855 addr.sin_port = htons(NSCTL_PORT);
856 controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
857 setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
858 setsockopt(controlfd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
859 if (bind(controlfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
860 {
861 LOG(0, 0, 0, "Error in control bind: %s\n", strerror(errno));
862 exit(1);
863 }
864
865 // Dynamic Authorization Extensions to RADIUS
866 memset(&addr, 0, sizeof(addr));
867 addr.sin_family = AF_INET;
868 addr.sin_port = htons(config->radius_dae_port);
869 daefd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
870 setsockopt(daefd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
871 setsockopt(daefd, SOL_IP, IP_PKTINFO, &on, sizeof(on)); // recvfromto
872 if (bind(daefd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
873 {
874 LOG(0, 0, 0, "Error in DAE bind: %s\n", strerror(errno));
875 exit(1);
876 }
877
878 #ifdef LAC
879 // Tunnel to Remote LNS
880 memset(&addr, 0, sizeof(addr));
881 addr.sin_family = AF_INET;
882 addr.sin_port = htons(config->bind_portremotelns);
883 addr.sin_addr.s_addr = config->bind_address_remotelns;
884 udplacfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
885 setsockopt(udplacfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
886 {
887 int flags = fcntl(udplacfd, F_GETFL, 0);
888 fcntl(udplacfd, F_SETFL, flags | O_NONBLOCK);
889 }
890 if (bind(udplacfd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
891 {
892 LOG(0, 0, 0, "Error in UDP REMOTE LNS bind: %s\n", strerror(errno));
893 exit(1);
894 }
895 #endif
896
897 // Intercept
898 snoopfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
899 }
900
901 //
902 // Find session by IP, < 1 for not found
903 //
904 // Confusingly enough, this 'ip' must be
905 // in _network_ order. This being the common
906 // case when looking it up from IP packet headers.
907 //
908 // We actually use this cache for two things.
909 // #1. For used IP addresses, this maps to the
910 // session ID that it's used by.
911 // #2. For un-used IP addresses, this maps to the
912 // index into the pool table that contains that
913 // IP address.
914 //
915
916 static sessionidt lookup_ipmap(in_addr_t ip)
917 {
918 uint8_t *a = (uint8_t *) &ip;
919 union iphash *h = ip_hash;
920
921 if (!(h = h[*a++].idx)) return 0;
922 if (!(h = h[*a++].idx)) return 0;
923 if (!(h = h[*a++].idx)) return 0;
924
925 return h[*a].sess;
926 }
927
928 static sessionidt lookup_ipv6map(struct in6_addr ip)
929 {
930 struct ipv6radix *curnode;
931 int i;
932 int s;
933 char ipv6addr[INET6_ADDRSTRLEN];
934
935 curnode = &ipv6_hash[ip.s6_addr[0]];
936 i = 1;
937 s = curnode->sess;
938
939 while (s == 0 && i < 15 && curnode->branch != NULL)
940 {
941 curnode = &curnode->branch[ip.s6_addr[i]];
942 s = curnode->sess;
943 i++;
944 }
945
946 LOG(4, s, session[s].tunnel, "Looking up address %s and got %d\n",
947 inet_ntop(AF_INET6, &ip, ipv6addr,
948 INET6_ADDRSTRLEN),
949 s);
950
951 return s;
952 }
953
954 sessionidt sessionbyip(in_addr_t ip)
955 {
956 sessionidt s = lookup_ipmap(ip);
957 CSTAT(sessionbyip);
958
959 if (s > 0 && s < MAXSESSION && session[s].opened)
960 return s;
961
962 return 0;
963 }
964
965 sessionidt sessionbyipv6(struct in6_addr ip)
966 {
967 sessionidt s;
968 CSTAT(sessionbyipv6);
969
970 if (!memcmp(&config->ipv6_prefix, &ip, 8) ||
971 (ip.s6_addr[0] == 0xFE &&
972 ip.s6_addr[1] == 0x80 &&
973 ip.s6_addr16[1] == 0 &&
974 ip.s6_addr16[2] == 0 &&
975 ip.s6_addr16[3] == 0)) {
976 s = lookup_ipmap(*(in_addr_t *) &ip.s6_addr[8]);
977 } else {
978 s = lookup_ipv6map(ip);
979 }
980
981 if (s > 0 && s < MAXSESSION && session[s].opened)
982 return s;
983
984 return 0;
985 }
986
987 //
988 // Take an IP address in HOST byte order and
989 // add it to the sessionid by IP cache.
990 //
991 // (It's actually cached in network order)
992 //
993 static void cache_ipmap(in_addr_t ip, sessionidt s)
994 {
995 in_addr_t nip = htonl(ip); // MUST be in network order. I.e. MSB must in be ((char *) (&ip))[0]
996 uint8_t *a = (uint8_t *) &nip;
997 union iphash *h = ip_hash;
998 int i;
999
1000 for (i = 0; i < 3; i++)
1001 {
1002 if (!(h[a[i]].idx || (h[a[i]].idx = calloc(256, sizeof(union iphash)))))
1003 return;
1004
1005 h = h[a[i]].idx;
1006 }
1007
1008 h[a[3]].sess = s;
1009
1010 if (s > 0)
1011 LOG(4, s, session[s].tunnel, "Caching ip address %s\n", fmtaddr(nip, 0));
1012
1013 else if (s == 0)
1014 LOG(4, 0, 0, "Un-caching ip address %s\n", fmtaddr(nip, 0));
1015 // else a map to an ip pool index.
1016 }
1017
1018 static void uncache_ipmap(in_addr_t ip)
1019 {
1020 cache_ipmap(ip, 0); // Assign it to the NULL session.
1021 }
1022
1023 static void cache_ipv6map(struct in6_addr ip, int prefixlen, sessionidt s)
1024 {
1025 int i;
1026 int bytes;
1027 struct ipv6radix *curnode;
1028 char ipv6addr[INET6_ADDRSTRLEN];
1029
1030 curnode = &ipv6_hash[ip.s6_addr[0]];
1031
1032 bytes = prefixlen >> 3;
1033 i = 1;
1034 while (i < bytes) {
1035 if (curnode->branch == NULL)
1036 {
1037 if (!(curnode->branch = calloc(256,
1038 sizeof (struct ipv6radix))))
1039 return;
1040 }
1041 curnode = &curnode->branch[ip.s6_addr[i]];
1042 i++;
1043 }
1044
1045 curnode->sess = s;
1046
1047 if (s > 0)
1048 LOG(4, s, session[s].tunnel, "Caching ip address %s/%d\n",
1049 inet_ntop(AF_INET6, &ip, ipv6addr,
1050 INET6_ADDRSTRLEN),
1051 prefixlen);
1052 else if (s == 0)
1053 LOG(4, 0, 0, "Un-caching ip address %s/%d\n",
1054 inet_ntop(AF_INET6, &ip, ipv6addr,
1055 INET6_ADDRSTRLEN),
1056 prefixlen);
1057 }
1058
1059 //
1060 // CLI list to dump current ipcache.
1061 //
1062 int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
1063 {
1064 union iphash *d = ip_hash, *e, *f, *g;
1065 int i, j, k, l;
1066 int count = 0;
1067
1068 if (CLI_HELP_REQUESTED)
1069 return CLI_HELP_NO_ARGS;
1070
1071 cli_print(cli, "%7s %s", "Sess#", "IP Address");
1072
1073 for (i = 0; i < 256; ++i)
1074 {
1075 if (!d[i].idx)
1076 continue;
1077
1078 e = d[i].idx;
1079 for (j = 0; j < 256; ++j)
1080 {
1081 if (!e[j].idx)
1082 continue;
1083
1084 f = e[j].idx;
1085 for (k = 0; k < 256; ++k)
1086 {
1087 if (!f[k].idx)
1088 continue;
1089
1090 g = f[k].idx;
1091 for (l = 0; l < 256; ++l)
1092 {
1093 if (!g[l].sess)
1094 continue;
1095
1096 cli_print(cli, "%7d %d.%d.%d.%d", g[l].sess, i, j, k, l);
1097 ++count;
1098 }
1099 }
1100 }
1101 }
1102 cli_print(cli, "%d entries in cache", count);
1103 return CLI_OK;
1104 }
1105
1106
1107 // Find session by username, 0 for not found
1108 // walled garden users aren't authenticated, so the username is
1109 // reasonably useless. Ignore them to avoid incorrect actions
1110 //
1111 // This is VERY inefficent. Don't call it often. :)
1112 //
1113 sessionidt sessionbyuser(char *username)
1114 {
1115 int s;
1116 CSTAT(sessionbyuser);
1117
1118 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
1119 {
1120 if (!session[s].opened)
1121 continue;
1122
1123 if (session[s].walled_garden)
1124 continue; // Skip walled garden users.
1125
1126 if (!strncmp(session[s].user, username, 128))
1127 return s;
1128
1129 }
1130 return 0; // Not found.
1131 }
1132
1133 void send_garp(in_addr_t ip)
1134 {
1135 int s;
1136 struct ifreq ifr;
1137 uint8_t mac[6];
1138
1139 s = socket(PF_INET, SOCK_DGRAM, 0);
1140 if (s < 0)
1141 {
1142 LOG(0, 0, 0, "Error creating socket for GARP: %s\n", strerror(errno));
1143 return;
1144 }
1145 memset(&ifr, 0, sizeof(ifr));
1146 strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name) - 1);
1147 if (ioctl(s, SIOCGIFHWADDR, &ifr) < 0)
1148 {
1149 LOG(0, 0, 0, "Error getting eth0 hardware address for GARP: %s\n", strerror(errno));
1150 close(s);
1151 return;
1152 }
1153 memcpy(mac, &ifr.ifr_hwaddr.sa_data, 6*sizeof(char));
1154 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
1155 {
1156 LOG(0, 0, 0, "Error getting eth0 interface index for GARP: %s\n", strerror(errno));
1157 close(s);
1158 return;
1159 }
1160 close(s);
1161 sendarp(ifr.ifr_ifindex, mac, ip);
1162 }
1163
1164 static sessiont *sessiontbysessionidt(sessionidt s)
1165 {
1166 if (!s || s >= MAXSESSION) return NULL;
1167 return &session[s];
1168 }
1169
1170 static sessionidt sessionidtbysessiont(sessiont *s)
1171 {
1172 sessionidt val = s-session;
1173 if (s < session || val >= MAXSESSION) return 0;
1174 return val;
1175 }
1176
1177 // actually send a control message for a specific tunnel
1178 void tunnelsend(uint8_t * buf, uint16_t l, tunnelidt t)
1179 {
1180 struct sockaddr_in addr;
1181
1182 CSTAT(tunnelsend);
1183
1184 if (!t)
1185 {
1186 LOG(0, 0, t, "tunnelsend called with 0 as tunnel id\n");
1187 STAT(tunnel_tx_errors);
1188 return;
1189 }
1190
1191 if (!tunnel[t].ip)
1192 {
1193 LOG(1, 0, t, "Error sending data out tunnel: no remote endpoint (tunnel not set up)\n");
1194 STAT(tunnel_tx_errors);
1195 return;
1196 }
1197
1198 memset(&addr, 0, sizeof(addr));
1199 addr.sin_family = AF_INET;
1200 *(uint32_t *) & addr.sin_addr = htonl(tunnel[t].ip);
1201 addr.sin_port = htons(tunnel[t].port);
1202
1203 // sequence expected, if sequence in message
1204 if (*buf & 0x08) *(uint16_t *) (buf + ((*buf & 0x40) ? 10 : 8)) = htons(tunnel[t].nr);
1205
1206 // If this is a control message, deal with retries
1207 if (*buf & 0x80)
1208 {
1209 tunnel[t].last = time_now; // control message sent
1210 tunnel[t].retry = backoff(tunnel[t].try); // when to resend
1211 if (tunnel[t].try)
1212 {
1213 STAT(tunnel_retries);
1214 LOG(3, 0, t, "Control message resend try %d\n", tunnel[t].try);
1215 }
1216 }
1217 #ifdef LAC
1218 if (sendto((tunnel[t].isremotelns?udplacfd:udpfd), buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1219 #else
1220 if (sendto(udpfd, buf, l, 0, (void *) &addr, sizeof(addr)) < 0)
1221 #endif
1222 {
1223 LOG(0, ntohs((*(uint16_t *) (buf + 6))), t, "Error sending data out tunnel: %s (udpfd=%d, buf=%p, len=%d, dest=%s)\n",
1224 strerror(errno), udpfd, buf, l, inet_ntoa(addr.sin_addr));
1225 STAT(tunnel_tx_errors);
1226 return;
1227 }
1228
1229 LOG_HEX(5, "Send Tunnel Data", buf, l);
1230 STAT(tunnel_tx_packets);
1231 INC_STAT(tunnel_tx_bytes, l);
1232 }
1233
1234 //
1235 // Tiny helper function to write data to
1236 // the 'tun' device.
1237 //
1238 int tun_write(uint8_t * data, int size)
1239 {
1240 return write(tunfd, data, size);
1241 }
1242
1243 // adjust tcp mss to avoid fragmentation (called only for tcp packets with syn set)
1244 void adjust_tcp_mss(sessionidt s, tunnelidt t, uint8_t *buf, int len, uint8_t *tcp)
1245 {
1246 int d = (tcp[12] >> 4) * 4;
1247 uint8_t *mss = 0;
1248 uint8_t *opts;
1249 uint8_t *data;
1250 uint16_t orig;
1251 uint32_t sum;
1252
1253 if ((tcp[13] & 0x3f) & ~(TCP_FLAG_SYN|TCP_FLAG_ACK)) // only want SYN and SYN,ACK
1254 return;
1255
1256 if (tcp + d > buf + len) // short?
1257 return;
1258
1259 opts = tcp + 20;
1260 data = tcp + d;
1261
1262 while (opts < data)
1263 {
1264 if (*opts == 2 && opts[1] == 4) // mss option (2), length 4
1265 {
1266 mss = opts + 2;
1267 if (mss + 2 > data) return; // short?
1268 break;
1269 }
1270
1271 if (*opts == 0) return; // end of options
1272 if (*opts == 1 || !opts[1]) // no op (one byte), or no length (prevent loop)
1273 opts++;
1274 else
1275 opts += opts[1]; // skip over option
1276 }
1277
1278 if (!mss) return; // not found
1279 orig = ntohs(*(uint16_t *) mss);
1280
1281 if (orig <= MSS) return; // mss OK
1282
1283 LOG(5, s, t, "TCP: %s:%u -> %s:%u SYN%s: adjusted mss from %u to %u\n",
1284 fmtaddr(*(in_addr_t *) (buf + 12), 0), ntohs(*(uint16_t *) tcp),
1285 fmtaddr(*(in_addr_t *) (buf + 16), 1), ntohs(*(uint16_t *) (tcp + 2)),
1286 (tcp[13] & TCP_FLAG_ACK) ? ",ACK" : "", orig, MSS);
1287
1288 // set mss
1289 *(int16_t *) mss = htons(MSS);
1290
1291 // adjust checksum (see rfc1141)
1292 sum = orig + (~MSS & 0xffff);
1293 sum += ntohs(*(uint16_t *) (tcp + 16));
1294 sum = (sum & 0xffff) + (sum >> 16);
1295 *(uint16_t *) (tcp + 16) = htons(sum + (sum >> 16));
1296 }
1297
1298 void processmpframe(sessionidt s, tunnelidt t, uint8_t *p, uint16_t l, uint8_t extra)
1299 {
1300 uint16_t proto;
1301 if (extra) {
1302 // Skip the four extra bytes
1303 p += 4;
1304 l -= 4;
1305 }
1306
1307 if (*p & 1)
1308 {
1309 proto = *p++;
1310 l--;
1311 }
1312 else
1313 {
1314 proto = ntohs(*(uint16_t *) p);
1315 p += 2;
1316 l -= 2;
1317 }
1318 if (proto == PPPIP)
1319 {
1320 if (session[s].die)
1321 {
1322 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1323 return; // closing session, PPP not processed
1324 }
1325 session[s].last_packet = session[s].last_data = time_now;
1326 processipin(s, t, p, l);
1327 }
1328 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
1329 {
1330 if (session[s].die)
1331 {
1332 LOG(4, s, t, "MPPP: Session %d is closing. Don't process PPP packets\n", s);
1333 return; // closing session, PPP not processed
1334 }
1335
1336 session[s].last_packet = session[s].last_data = time_now;
1337 processipv6in(s, t, p, l);
1338 }
1339 else if (proto == PPPIPCP)
1340 {
1341 session[s].last_packet = session[s].last_data = time_now;
1342 processipcp(s, t, p, l);
1343 }
1344 else if (proto == PPPCCP)
1345 {
1346 session[s].last_packet = session[s].last_data = time_now;
1347 processccp(s, t, p, l);
1348 }
1349 else
1350 {
1351 LOG(2, s, t, "MPPP: Unsupported MP protocol 0x%04X received\n",proto);
1352 }
1353 }
1354
1355 static void update_session_out_stat(sessionidt s, sessiont *sp, int len)
1356 {
1357 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1358 sp->cout_delta += len;
1359 sp->pout++;
1360 sp->last_data = time_now;
1361
1362 sess_local[s].cout += len; // To send to master..
1363 sess_local[s].pout++;
1364 }
1365
1366 // process outgoing (to tunnel) IP
1367 //
1368 // (i.e. this routine writes to data[-8]).
1369 void processipout(uint8_t *buf, int len)
1370 {
1371 sessionidt s;
1372 sessiont *sp;
1373 tunnelidt t;
1374 in_addr_t ip;
1375
1376 uint8_t *data = buf; // Keep a copy of the originals.
1377 int size = len;
1378
1379 uint8_t fragbuf[MAXETHER + 20];
1380
1381 CSTAT(processipout);
1382
1383 if (len < MIN_IP_SIZE)
1384 {
1385 LOG(1, 0, 0, "Short IP, %d bytes\n", len);
1386 STAT(tun_rx_errors);
1387 return;
1388 }
1389 if (len >= MAXETHER)
1390 {
1391 LOG(1, 0, 0, "Oversize IP packet %d bytes\n", len);
1392 STAT(tun_rx_errors);
1393 return;
1394 }
1395
1396 // Skip the tun header
1397 buf += 4;
1398 len -= 4;
1399
1400 // Got an IP header now
1401 if (*(uint8_t *)(buf) >> 4 != 4)
1402 {
1403 LOG(1, 0, 0, "IP: Don't understand anything except IPv4\n");
1404 return;
1405 }
1406
1407 ip = *(uint32_t *)(buf + 16);
1408 if (!(s = sessionbyip(ip)))
1409 {
1410 // Is this a packet for a session that doesn't exist?
1411 static int rate = 0; // Number of ICMP packets we've sent this second.
1412 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1413
1414 if (last != time_now)
1415 {
1416 last = time_now;
1417 rate = 0;
1418 }
1419
1420 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1421 {
1422 LOG(4, 0, 0, "IP: Sending ICMP host unreachable to %s\n", fmtaddr(*(in_addr_t *)(buf + 12), 0));
1423 host_unreachable(*(in_addr_t *)(buf + 12), *(uint16_t *)(buf + 4),
1424 config->bind_address ? config->bind_address : my_address, buf, len);
1425 }
1426 return;
1427 }
1428
1429 t = session[s].tunnel;
1430 if (len > session[s].mru || (session[s].mrru && len > session[s].mrru))
1431 {
1432 LOG(3, s, t, "Packet size more than session MRU\n");
1433 return;
1434 }
1435
1436 sp = &session[s];
1437
1438 // DoS prevention: enforce a maximum number of packets per 0.1s for a session
1439 if (config->max_packets > 0)
1440 {
1441 if (sess_local[s].last_packet_out == TIME)
1442 {
1443 int max = config->max_packets;
1444
1445 // All packets for throttled sessions are handled by the
1446 // master, so further limit by using the throttle rate.
1447 // A bit of a kludge, since throttle rate is in kbps,
1448 // but should still be generous given our average DSL
1449 // packet size is 200 bytes: a limit of 28kbps equates
1450 // to around 180 packets per second.
1451 if (!config->cluster_iam_master && sp->throttle_out && sp->throttle_out < max)
1452 max = sp->throttle_out;
1453
1454 if (++sess_local[s].packets_out > max)
1455 {
1456 sess_local[s].packets_dropped++;
1457 return;
1458 }
1459 }
1460 else
1461 {
1462 if (sess_local[s].packets_dropped)
1463 {
1464 INC_STAT(tun_rx_dropped, sess_local[s].packets_dropped);
1465 LOG(3, s, t, "Dropped %u/%u packets to %s for %suser %s\n",
1466 sess_local[s].packets_dropped, sess_local[s].packets_out,
1467 fmtaddr(ip, 0), sp->throttle_out ? "throttled " : "",
1468 sp->user);
1469 }
1470
1471 sess_local[s].last_packet_out = TIME;
1472 sess_local[s].packets_out = 1;
1473 sess_local[s].packets_dropped = 0;
1474 }
1475 }
1476
1477 // run access-list if any
1478 if (session[s].filter_out && !ip_filter(buf, len, session[s].filter_out - 1))
1479 return;
1480
1481 // adjust MSS on SYN and SYN,ACK packets with options
1482 if ((ntohs(*(uint16_t *) (buf + 6)) & 0x1fff) == 0 && buf[9] == IPPROTO_TCP) // first tcp fragment
1483 {
1484 int ihl = (buf[0] & 0xf) * 4; // length of IP header
1485 if (len >= ihl + 20 && (buf[ihl + 13] & TCP_FLAG_SYN) && ((buf[ihl + 12] >> 4) > 5))
1486 adjust_tcp_mss(s, t, buf, len, buf + ihl);
1487 }
1488
1489 if (sp->tbf_out)
1490 {
1491 // Are we throttling this session?
1492 if (config->cluster_iam_master)
1493 tbf_queue_packet(sp->tbf_out, data, size);
1494 else
1495 master_throttle_packet(sp->tbf_out, data, size);
1496 return;
1497 }
1498
1499 if (sp->walled_garden && !config->cluster_iam_master)
1500 {
1501 // We are walled-gardening this
1502 master_garden_packet(s, data, size);
1503 return;
1504 }
1505
1506 if(session[s].bundle != 0 && bundle[session[s].bundle].num_of_links > 1)
1507 {
1508
1509 if (!config->cluster_iam_master)
1510 {
1511 // The MPPP packets must be managed by the Master.
1512 master_forward_mppp_packet(s, data, size);
1513 return;
1514 }
1515
1516 // Add on L2TP header
1517 sessionidt members[MAXBUNDLESES];
1518 bundleidt bid = session[s].bundle;
1519 bundlet *b = &bundle[bid];
1520 uint32_t num_of_links, nb_opened;
1521 int i;
1522
1523 num_of_links = b->num_of_links;
1524 nb_opened = 0;
1525 for (i = 0;i < num_of_links;i++)
1526 {
1527 s = b->members[i];
1528 if (session[s].ppp.lcp == Opened)
1529 {
1530 members[nb_opened] = s;
1531 nb_opened++;
1532 }
1533 }
1534
1535 if (nb_opened < 1)
1536 {
1537 LOG(3, s, t, "MPPP: PROCESSIPOUT ERROR, no session opened in bundle:%d\n", bid);
1538 return;
1539 }
1540
1541 num_of_links = nb_opened;
1542 b->current_ses = (b->current_ses + 1) % num_of_links;
1543 s = members[b->current_ses];
1544 t = session[s].tunnel;
1545 sp = &session[s];
1546 LOG(4, s, t, "MPPP: (1)Session number becomes: %d\n", s);
1547
1548 if (num_of_links > 1)
1549 {
1550 if(len > MINFRAGLEN)
1551 {
1552 //for rotate traffic among the member links
1553 uint32_t divisor = num_of_links;
1554 if (divisor > 2)
1555 divisor = divisor/2 + (divisor & 1);
1556
1557 // Partition the packet to "num_of_links" fragments
1558 uint32_t fraglen = len / divisor;
1559 uint32_t last_fraglen = fraglen + len % divisor;
1560 uint32_t remain = len;
1561
1562 // send the first packet
1563 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, fraglen, s, t, PPPIP, 0, bid, MP_BEGIN);
1564 if (!p) return;
1565 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1566
1567 // statistics
1568 update_session_out_stat(s, sp, fraglen);
1569
1570 remain -= fraglen;
1571 while (remain > last_fraglen)
1572 {
1573 b->current_ses = (b->current_ses + 1) % num_of_links;
1574 s = members[b->current_ses];
1575 t = session[s].tunnel;
1576 sp = &session[s];
1577 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1578 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), fraglen, s, t, PPPIP, 0, bid, 0);
1579 if (!p) return;
1580 tunnelsend(fragbuf, fraglen + (p-fragbuf), t); // send it...
1581 update_session_out_stat(s, sp, fraglen);
1582 remain -= fraglen;
1583 }
1584 // send the last fragment
1585 b->current_ses = (b->current_ses + 1) % num_of_links;
1586 s = members[b->current_ses];
1587 t = session[s].tunnel;
1588 sp = &session[s];
1589 LOG(4, s, t, "MPPP: (2)Session number becomes: %d\n", s);
1590 p = makeppp(fragbuf, sizeof(fragbuf), buf+(len - remain), remain, s, t, PPPIP, 0, bid, MP_END);
1591 if (!p) return;
1592 tunnelsend(fragbuf, remain + (p-fragbuf), t); // send it...
1593 update_session_out_stat(s, sp, remain);
1594 if (remain != last_fraglen)
1595 LOG(3, s, t, "PROCESSIPOUT ERROR REMAIN != LAST_FRAGLEN, %d != %d\n", remain, last_fraglen);
1596 }
1597 else
1598 {
1599 // Send it as one frame
1600 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, bid, MP_BOTH_BITS);
1601 if (!p) return;
1602 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1603 LOG(4, s, t, "MPPP: packet sent as one frame\n");
1604 update_session_out_stat(s, sp, len);
1605 }
1606 }
1607 else
1608 {
1609 // Send it as one frame (NO MPPP Frame)
1610 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1611 if (!p) return;
1612 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1613 update_session_out_stat(s, sp, len);
1614 }
1615 }
1616 else
1617 {
1618 uint8_t *p = makeppp(fragbuf, sizeof(fragbuf), buf, len, s, t, PPPIP, 0, 0, 0);
1619 if (!p) return;
1620 tunnelsend(fragbuf, len + (p-fragbuf), t); // send it...
1621 update_session_out_stat(s, sp, len);
1622 }
1623
1624 // Snooping this session, send it to intercept box
1625 if (sp->snoop_ip && sp->snoop_port)
1626 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1627
1628 udp_tx += len;
1629 }
1630
1631 // process outgoing (to tunnel) IPv6
1632 //
1633 static void processipv6out(uint8_t * buf, int len)
1634 {
1635 sessionidt s;
1636 sessiont *sp;
1637 tunnelidt t;
1638 in_addr_t ip;
1639 struct in6_addr ip6;
1640
1641 uint8_t *data = buf; // Keep a copy of the originals.
1642 int size = len;
1643
1644 uint8_t b[MAXETHER + 20];
1645
1646 CSTAT(processipv6out);
1647
1648 if (len < MIN_IP_SIZE)
1649 {
1650 LOG(1, 0, 0, "Short IPv6, %d bytes\n", len);
1651 STAT(tunnel_tx_errors);
1652 return;
1653 }
1654 if (len >= MAXETHER)
1655 {
1656 LOG(1, 0, 0, "Oversize IPv6 packet %d bytes\n", len);
1657 STAT(tunnel_tx_errors);
1658 return;
1659 }
1660
1661 // Skip the tun header
1662 buf += 4;
1663 len -= 4;
1664
1665 // Got an IP header now
1666 if (*(uint8_t *)(buf) >> 4 != 6)
1667 {
1668 LOG(1, 0, 0, "IP: Don't understand anything except IPv6\n");
1669 return;
1670 }
1671
1672 ip6 = *(struct in6_addr *)(buf+24);
1673 s = sessionbyipv6(ip6);
1674
1675 if (s == 0)
1676 {
1677 ip = *(uint32_t *)(buf + 32);
1678 s = sessionbyip(ip);
1679 }
1680
1681 if (s == 0)
1682 {
1683 // Is this a packet for a session that doesn't exist?
1684 static int rate = 0; // Number of ICMP packets we've sent this second.
1685 static int last = 0; // Last time we reset the ICMP packet counter 'rate'.
1686
1687 if (last != time_now)
1688 {
1689 last = time_now;
1690 rate = 0;
1691 }
1692
1693 if (rate++ < config->icmp_rate) // Only send a max of icmp_rate per second.
1694 {
1695 // FIXME: Should send icmp6 host unreachable
1696 }
1697 return;
1698 }
1699 if (session[s].bundle && bundle[session[s].bundle].num_of_links > 1)
1700 {
1701 bundleidt bid = session[s].bundle;
1702 bundlet *b = &bundle[bid];
1703
1704 b->current_ses = (b->current_ses + 1) % b->num_of_links;
1705 s = b->members[b->current_ses];
1706 LOG(3, s, session[s].tunnel, "MPPP: Session number becomes: %u\n", s);
1707 }
1708 t = session[s].tunnel;
1709 sp = &session[s];
1710 sp->last_data = time_now;
1711
1712 // FIXME: add DoS prevention/filters?
1713
1714 if (sp->tbf_out)
1715 {
1716 // Are we throttling this session?
1717 if (config->cluster_iam_master)
1718 tbf_queue_packet(sp->tbf_out, data, size);
1719 else
1720 master_throttle_packet(sp->tbf_out, data, size);
1721 return;
1722 }
1723 else if (sp->walled_garden && !config->cluster_iam_master)
1724 {
1725 // We are walled-gardening this
1726 master_garden_packet(s, data, size);
1727 return;
1728 }
1729
1730 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1731
1732 // Add on L2TP header
1733 {
1734 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIPV6, 0, 0, 0);
1735 if (!p) return;
1736 tunnelsend(b, len + (p-b), t); // send it...
1737 }
1738
1739 // Snooping this session, send it to intercept box
1740 if (sp->snoop_ip && sp->snoop_port)
1741 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1742
1743 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1744 sp->cout_delta += len;
1745 sp->pout++;
1746 udp_tx += len;
1747
1748 sess_local[s].cout += len; // To send to master..
1749 sess_local[s].pout++;
1750 }
1751
1752 //
1753 // Helper routine for the TBF filters.
1754 // Used to send queued data in to the user!
1755 //
1756 static void send_ipout(sessionidt s, uint8_t *buf, int len)
1757 {
1758 sessiont *sp;
1759 tunnelidt t;
1760
1761 uint8_t b[MAXETHER + 20];
1762
1763 if (len < 0 || len > MAXETHER)
1764 {
1765 LOG(1, 0, 0, "Odd size IP packet: %d bytes\n", len);
1766 return;
1767 }
1768
1769 // Skip the tun header
1770 buf += 4;
1771 len -= 4;
1772
1773 if (!session[s].ip)
1774 return;
1775
1776 t = session[s].tunnel;
1777 sp = &session[s];
1778
1779 LOG(5, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
1780
1781 // Add on L2TP header
1782 {
1783 uint8_t *p = makeppp(b, sizeof(b), buf, len, s, t, PPPIP, 0, 0, 0);
1784 if (!p) return;
1785 tunnelsend(b, len + (p-b), t); // send it...
1786 }
1787
1788 // Snooping this session.
1789 if (sp->snoop_ip && sp->snoop_port)
1790 snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
1791
1792 increment_counter(&sp->cout, &sp->cout_wrap, len); // byte count
1793 sp->cout_delta += len;
1794 sp->pout++;
1795 udp_tx += len;
1796
1797 sess_local[s].cout += len; // To send to master..
1798 sess_local[s].pout++;
1799 }
1800
1801 // add an AVP (16 bit)
1802 static void control16(controlt * c, uint16_t avp, uint16_t val, uint8_t m)
1803 {
1804 uint16_t l = (m ? 0x8008 : 0x0008);
1805 c->buf16[c->length/2 + 0] = htons(l);
1806 c->buf16[c->length/2 + 1] = htons(0);
1807 c->buf16[c->length/2 + 2] = htons(avp);
1808 c->buf16[c->length/2 + 3] = htons(val);
1809 c->length += 8;
1810 }
1811
1812 // add an AVP (32 bit)
1813 static void control32(controlt * c, uint16_t avp, uint32_t val, uint8_t m)
1814 {
1815 uint16_t l = (m ? 0x800A : 0x000A);
1816 c->buf16[c->length/2 + 0] = htons(l);
1817 c->buf16[c->length/2 + 1] = htons(0);
1818 c->buf16[c->length/2 + 2] = htons(avp);
1819 *(uint32_t *) &c->buf[c->length + 6] = htonl(val);
1820 c->length += 10;
1821 }
1822
1823 // add an AVP (string)
1824 static void controls(controlt * c, uint16_t avp, char *val, uint8_t m)
1825 {
1826 uint16_t l = ((m ? 0x8000 : 0) + strlen(val) + 6);
1827 c->buf16[c->length/2 + 0] = htons(l);
1828 c->buf16[c->length/2 + 1] = htons(0);
1829 c->buf16[c->length/2 + 2] = htons(avp);
1830 memcpy(&c->buf[c->length + 6], val, strlen(val));
1831 c->length += 6 + strlen(val);
1832 }
1833
1834 // add a binary AVP
1835 static void controlb(controlt * c, uint16_t avp, uint8_t *val, unsigned int len, uint8_t m)
1836 {
1837 uint16_t l = ((m ? 0x8000 : 0) + len + 6);
1838 c->buf16[c->length/2 + 0] = htons(l);
1839 c->buf16[c->length/2 + 1] = htons(0);
1840 c->buf16[c->length/2 + 2] = htons(avp);
1841 memcpy(&c->buf[c->length + 6], val, len);
1842 c->length += 6 + len;
1843 }
1844
1845 // new control connection
1846 static controlt *controlnew(uint16_t mtype)
1847 {
1848 controlt *c;
1849 if (!controlfree)
1850 c = malloc(sizeof(controlt));
1851 else
1852 {
1853 c = controlfree;
1854 controlfree = c->next;
1855 }
1856 assert(c);
1857 c->next = 0;
1858 c->buf16[0] = htons(0xC802); // flags/ver
1859 c->length = 12;
1860 control16(c, 0, mtype, 1);
1861 return c;
1862 }
1863
1864 // send zero block if nothing is waiting
1865 // (ZLB send).
1866 static void controlnull(tunnelidt t)
1867 {
1868 uint16_t buf[6];
1869 if (tunnel[t].controlc) // Messages queued; They will carry the ack.
1870 return;
1871
1872 buf[0] = htons(0xC802); // flags/ver
1873 buf[1] = htons(12); // length
1874 buf[2] = htons(tunnel[t].far); // tunnel
1875 buf[3] = htons(0); // session
1876 buf[4] = htons(tunnel[t].ns); // sequence
1877 buf[5] = htons(tunnel[t].nr); // sequence
1878 tunnelsend((uint8_t *)buf, 12, t);
1879 }
1880
1881 // add a control message to a tunnel, and send if within window
1882 static void controladd(controlt *c, sessionidt far, tunnelidt t)
1883 {
1884 c->buf16[1] = htons(c->length); // length
1885 c->buf16[2] = htons(tunnel[t].far); // tunnel
1886 c->buf16[3] = htons(far); // session
1887 c->buf16[4] = htons(tunnel[t].ns); // sequence
1888 tunnel[t].ns++; // advance sequence
1889 // link in message in to queue
1890 if (tunnel[t].controlc)
1891 tunnel[t].controle->next = c;
1892 else
1893 tunnel[t].controls = c;
1894
1895 tunnel[t].controle = c;
1896 tunnel[t].controlc++;
1897
1898 // send now if space in window
1899 if (tunnel[t].controlc <= tunnel[t].window)
1900 {
1901 tunnel[t].try = 0; // first send
1902 tunnelsend(c->buf, c->length, t);
1903 }
1904 }
1905
1906 //
1907 // Throttle or Unthrottle a session
1908 //
1909 // Throttle the data from/to through a session to no more than
1910 // 'rate_in' kbit/sec in (from user) or 'rate_out' kbit/sec out (to
1911 // user).
1912 //
1913 // If either value is -1, the current value is retained for that
1914 // direction.
1915 //
1916 void throttle_session(sessionidt s, int rate_in, int rate_out)
1917 {
1918 if (!session[s].opened)
1919 return; // No-one home.
1920
1921 if (!*session[s].user)
1922 return; // User not logged in
1923
1924 if (rate_in >= 0)
1925 {
1926 int bytes = rate_in * 1024 / 8; // kbits to bytes
1927 if (session[s].tbf_in)
1928 free_tbf(session[s].tbf_in);
1929
1930 if (rate_in > 0)
1931 session[s].tbf_in = new_tbf(s, bytes * 2, bytes, send_ipin);
1932 else
1933 session[s].tbf_in = 0;
1934
1935 session[s].throttle_in = rate_in;
1936 }
1937
1938 if (rate_out >= 0)
1939 {
1940 int bytes = rate_out * 1024 / 8;
1941 if (session[s].tbf_out)
1942 free_tbf(session[s].tbf_out);
1943
1944 if (rate_out > 0)
1945 session[s].tbf_out = new_tbf(s, bytes * 2, bytes, send_ipout);
1946 else
1947 session[s].tbf_out = 0;
1948
1949 session[s].throttle_out = rate_out;
1950 }
1951 }
1952
1953 // add/remove filters from session (-1 = no change)
1954 void filter_session(sessionidt s, int filter_in, int filter_out)
1955 {
1956 if (!session[s].opened)
1957 return; // No-one home.
1958
1959 if (!*session[s].user)
1960 return; // User not logged in
1961
1962 // paranoia
1963 if (filter_in > MAXFILTER) filter_in = -1;
1964 if (filter_out > MAXFILTER) filter_out = -1;
1965 if (session[s].filter_in > MAXFILTER) session[s].filter_in = 0;
1966 if (session[s].filter_out > MAXFILTER) session[s].filter_out = 0;
1967
1968 if (filter_in >= 0)
1969 {
1970 if (session[s].filter_in)
1971 ip_filters[session[s].filter_in - 1].used--;
1972
1973 if (filter_in > 0)
1974 ip_filters[filter_in - 1].used++;
1975
1976 session[s].filter_in = filter_in;
1977 }
1978
1979 if (filter_out >= 0)
1980 {
1981 if (session[s].filter_out)
1982 ip_filters[session[s].filter_out - 1].used--;
1983
1984 if (filter_out > 0)
1985 ip_filters[filter_out - 1].used++;
1986
1987 session[s].filter_out = filter_out;
1988 }
1989 }
1990
1991 // start tidy shutdown of session
1992 void sessionshutdown(sessionidt s, char const *reason, int cdn_result, int cdn_error, int term_cause)
1993 {
1994 int walled_garden = session[s].walled_garden;
1995 bundleidt b = session[s].bundle;
1996 //delete routes only for last session in bundle (in case of MPPP)
1997 int del_routes = !b || (bundle[b].num_of_links == 1);
1998
1999 CSTAT(sessionshutdown);
2000
2001 if (!session[s].opened)
2002 {
2003 LOG(3, s, session[s].tunnel, "Called sessionshutdown on an unopened session.\n");
2004 return; // not a live session
2005 }
2006
2007 if (!session[s].die)
2008 {
2009 struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
2010 LOG(2, s, session[s].tunnel, "Shutting down session %u: %s\n", s, reason);
2011 run_plugins(PLUGIN_KILL_SESSION, &data);
2012 session[s].die = TIME + 150; // Clean up in 15 seconds
2013 }
2014
2015 if (session[s].ip && !walled_garden && !session[s].die)
2016 {
2017 // RADIUS Stop message
2018 uint16_t r = radiusnew(s);
2019 if (r)
2020 {
2021 // stop, if not already trying
2022 if (radius[r].state != RADIUSSTOP)
2023 {
2024 radius[r].term_cause = term_cause;
2025 radius[r].term_msg = reason;
2026 radiussend(r, RADIUSSTOP);
2027 }
2028 }
2029 else
2030 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Stop message\n");
2031
2032 // Save counters to dump to accounting file
2033 if (*config->accounting_dir && shut_acct_n < sizeof(shut_acct) / sizeof(*shut_acct))
2034 memcpy(&shut_acct[shut_acct_n++], &session[s], sizeof(session[s]));
2035 }
2036
2037 if (session[s].ip)
2038 { // IP allocated, clear and unroute
2039 int r;
2040 int routed = 0;
2041 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
2042 {
2043 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
2044 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
2045 routed++;
2046
2047 if (del_routes) routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 0);
2048 session[s].route[r].ip = 0;
2049 }
2050
2051 if (session[s].ip_pool_index == -1) // static ip
2052 {
2053 if (!routed && del_routes) routeset(s, session[s].ip, 0, 0, 0);
2054 session[s].ip = 0;
2055 }
2056 else
2057 free_ip_address(s);
2058
2059 // unroute IPv6, if setup
2060 if (session[s].ppp.ipv6cp == Opened && session[s].ipv6prefixlen && del_routes)
2061 route6set(s, session[s].ipv6route, session[s].ipv6prefixlen, 0);
2062
2063 if (b)
2064 {
2065 // This session was part of a bundle
2066 bundle[b].num_of_links--;
2067 LOG(3, s, session[s].tunnel, "MPPP: Dropping member link: %d from bundle %d\n",s,b);
2068 if(bundle[b].num_of_links == 0)
2069 {
2070 bundleclear(b);
2071 LOG(3, s, session[s].tunnel, "MPPP: Kill bundle: %d (No remaing member links)\n",b);
2072 }
2073 else
2074 {
2075 // Adjust the members array to accomodate the new change
2076 uint8_t mem_num = 0;
2077 // It should be here num_of_links instead of num_of_links-1 (previous instruction "num_of_links--")
2078 if(bundle[b].members[bundle[b].num_of_links] != s)
2079 {
2080 uint8_t ml;
2081 for(ml = 0; ml<bundle[b].num_of_links; ml++)
2082 if(bundle[b].members[ml] == s)
2083 {
2084 mem_num = ml;
2085 break;
2086 }
2087 bundle[b].members[mem_num] = bundle[b].members[bundle[b].num_of_links];
2088 LOG(3, s, session[s].tunnel, "MPPP: Adjusted member links array\n");
2089
2090 // If the killed session is the first of the bundle,
2091 // the new first session must be stored in the cache_ipmap
2092 // else the function sessionbyip return 0 and the sending not work any more (processipout).
2093 if (mem_num == 0)
2094 {
2095 sessionidt new_s = bundle[b].members[0];
2096
2097 routed = 0;
2098 // Add the route for this session.
2099 for (r = 0; r < MAXROUTE && session[new_s].route[r].ip; r++)
2100 {
2101 int i, prefixlen;
2102 in_addr_t ip;
2103
2104 prefixlen = session[new_s].route[r].prefixlen;
2105 ip = session[new_s].route[r].ip;
2106
2107 if (!prefixlen) prefixlen = 32;
2108 ip &= 0xffffffff << (32 - prefixlen); // Force the ip to be the first one in the route.
2109
2110 for (i = ip; i < ip+(1<<(32-prefixlen)) ; ++i)
2111 cache_ipmap(i, new_s);
2112 }
2113 cache_ipmap(session[new_s].ip, new_s);
2114
2115 // IPV6 route
2116 if (session[new_s].ipv6prefixlen)
2117 cache_ipv6map(session[new_s].ipv6route, session[new_s].ipv6prefixlen, new_s);
2118 }
2119 }
2120 }
2121
2122 cluster_send_bundle(b);
2123 }
2124 }
2125
2126 if (session[s].throttle_in || session[s].throttle_out) // Unthrottle if throttled.
2127 throttle_session(s, 0, 0);
2128
2129 if (cdn_result)
2130 { // Send CDN
2131 controlt *c = controlnew(14); // sending CDN
2132 if (cdn_error)
2133 {
2134 uint16_t buf[2];
2135 buf[0] = htons(cdn_result);
2136 buf[1] = htons(cdn_error);
2137 controlb(c, 1, (uint8_t *)buf, 4, 1);
2138 }
2139 else
2140 control16(c, 1, cdn_result, 1);
2141
2142 control16(c, 14, s, 1); // assigned session (our end)
2143 controladd(c, session[s].far, session[s].tunnel); // send the message
2144 }
2145
2146 // update filter refcounts
2147 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
2148 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
2149
2150 // clear PPP state
2151 memset(&session[s].ppp, 0, sizeof(session[s].ppp));
2152 sess_local[s].lcp.restart = 0;
2153 sess_local[s].ipcp.restart = 0;
2154 sess_local[s].ipv6cp.restart = 0;
2155 sess_local[s].ccp.restart = 0;
2156
2157 cluster_send_session(s);
2158 }
2159
2160 void sendipcp(sessionidt s, tunnelidt t)
2161 {
2162 uint8_t buf[MAXETHER];
2163 uint8_t *q;
2164
2165 CSTAT(sendipcp);
2166 LOG(3, s, t, "IPCP: send ConfigReq\n");
2167
2168 if (!session[s].unique_id)
2169 {
2170 if (!++last_id) ++last_id; // skip zero
2171 session[s].unique_id = last_id;
2172 }
2173
2174 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPCP, 0, 0, 0);
2175 if (!q) return;
2176
2177 *q = ConfigReq;
2178 q[1] = session[s].unique_id & 0xf; // ID, dont care, we only send one type of request
2179 *(uint16_t *) (q + 2) = htons(10); // packet length
2180 q[4] = 3; // ip address option
2181 q[5] = 6; // option length
2182 *(in_addr_t *) (q + 6) = config->peer_address ? config->peer_address :
2183 config->iftun_address ? config->iftun_address :
2184 my_address; // send my IP
2185
2186 tunnelsend(buf, 10 + (q - buf), t); // send it
2187 restart_timer(s, ipcp);
2188 }
2189
2190 void sendipv6cp(sessionidt s, tunnelidt t)
2191 {
2192 uint8_t buf[MAXETHER];
2193 uint8_t *q;
2194
2195 CSTAT(sendipv6cp);
2196 LOG(3, s, t, "IPV6CP: send ConfigReq\n");
2197
2198 q = makeppp(buf, sizeof(buf), 0, 0, s, t, PPPIPV6CP, 0, 0, 0);
2199 if (!q) return;
2200
2201 *q = ConfigReq;
2202 q[1] = session[s].unique_id & 0xf; // ID, don't care, we
2203 // only send one type
2204 // of request
2205 *(uint16_t *) (q + 2) = htons(14);
2206 q[4] = 1; // interface identifier option
2207 q[5] = 10; // option length
2208 *(uint32_t *) (q + 6) = 0; // We'll be prefix::1
2209 *(uint32_t *) (q + 10) = 0;
2210 q[13] = 1;
2211
2212 tunnelsend(buf, 14 + (q - buf), t); // send it
2213 restart_timer(s, ipv6cp);
2214 }
2215
2216 static void sessionclear(sessionidt s)
2217 {
2218 memset(&session[s], 0, sizeof(session[s]));
2219 memset(&sess_local[s], 0, sizeof(sess_local[s]));
2220 memset(&cli_session_actions[s], 0, sizeof(cli_session_actions[s]));
2221
2222 session[s].tunnel = T_FREE; // Mark it as free.
2223 session[s].next = sessionfree;
2224 sessionfree = s;
2225 }
2226
2227 // kill a session now
2228 void sessionkill(sessionidt s, char *reason)
2229 {
2230 CSTAT(sessionkill);
2231
2232 if (!session[s].opened) // not alive
2233 return;
2234
2235 if (session[s].next)
2236 {
2237 LOG(0, s, session[s].tunnel, "Tried to kill a session with next pointer set (%u)\n", session[s].next);
2238 return;
2239 }
2240
2241 if (!session[s].die)
2242 sessionshutdown(s, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET); // close radius/routes, etc.
2243
2244 if (sess_local[s].radius)
2245 radiusclear(sess_local[s].radius, s); // cant send clean accounting data, session is killed
2246
2247 #ifdef LAC
2248 if (session[s].forwardtosession)
2249 {
2250 sessionidt sess = session[s].forwardtosession;
2251 if (session[sess].forwardtosession == s)
2252 {
2253 // Shutdown the linked session also.
2254 sessionshutdown(sess, reason, CDN_ADMIN_DISC, TERM_ADMIN_RESET);
2255 }
2256 }
2257 #endif
2258
2259 LOG(2, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
2260 sessionclear(s);
2261 cluster_send_session(s);
2262 }
2263
2264 static void tunnelclear(tunnelidt t)
2265 {
2266 if (!t) return;
2267 memset(&tunnel[t], 0, sizeof(tunnel[t]));
2268 tunnel[t].state = TUNNELFREE;
2269 }
2270
2271 static void bundleclear(bundleidt b)
2272 {
2273 if (!b) return;
2274 memset(&bundle[b], 0, sizeof(bundle[b]));
2275 bundle[b].state = BUNDLEFREE;
2276 }
2277
2278 // kill a tunnel now
2279 static void tunnelkill(tunnelidt t, char *reason)
2280 {
2281 sessionidt s;
2282 controlt *c;
2283
2284 CSTAT(tunnelkill);
2285
2286 tunnel[t].state = TUNNELDIE;
2287
2288 // free control messages
2289 while ((c = tunnel[t].controls))
2290 {
2291 controlt * n = c->next;
2292 tunnel[t].controls = n;
2293 tunnel[t].controlc--;
2294 c->next = controlfree;
2295 controlfree = c;
2296 }
2297 // kill sessions
2298 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2299 if (session[s].tunnel == t)
2300 sessionkill(s, reason);
2301
2302 // free tunnel
2303 tunnelclear(t);
2304 LOG(1, 0, t, "Kill tunnel %u: %s\n", t, reason);
2305 cli_tunnel_actions[t].action = 0;
2306 cluster_send_tunnel(t);
2307 }
2308
2309 // shut down a tunnel cleanly
2310 static void tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
2311 {
2312 sessionidt s;
2313
2314 CSTAT(tunnelshutdown);
2315
2316 if (!tunnel[t].last || !tunnel[t].far || tunnel[t].state == TUNNELFREE)
2317 {
2318 // never set up, can immediately kill
2319 tunnelkill(t, reason);
2320 return;
2321 }
2322 LOG(1, 0, t, "Shutting down tunnel %u (%s)\n", t, reason);
2323
2324 // close session
2325 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
2326 if (session[s].tunnel == t)
2327 sessionshutdown(s, reason, CDN_NONE, TERM_ADMIN_RESET);
2328
2329 tunnel[t].state = TUNNELDIE;
2330 tunnel[t].die = TIME + 700; // Clean up in 70 seconds
2331 cluster_send_tunnel(t);
2332 // TBA - should we wait for sessions to stop?
2333 if (result)
2334 {
2335 controlt *c = controlnew(4); // sending StopCCN
2336 if (error)
2337 {
2338 uint16_t buf[32];
2339 int l = 4;
2340 buf[0] = htons(result);
2341 buf[1] = htons(error);
2342 if (msg)
2343 {
2344 int m = strlen(msg);
2345 if (m + 4 > sizeof(buf))
2346 m = sizeof(buf) - 4;
2347
2348 memcpy(buf+2, msg, m);
2349 l += m;
2350 }
2351
2352 controlb(c, 1, (uint8_t *)buf, l, 1);
2353 }
2354 else
2355 control16(c, 1, result, 1);
2356
2357 control16(c, 9, t, 1); // assigned tunnel (our end)
2358 controladd(c, 0, t); // send the message
2359 }
2360 }
2361
2362 // read and process packet on tunnel (UDP)
2363 void processudp(uint8_t *buf, int len, struct sockaddr_in *addr)
2364 {
2365 uint8_t *chapresponse = NULL;
2366 uint16_t l = len, t = 0, s = 0, ns = 0, nr = 0;
2367 uint8_t *p = buf + 2;
2368
2369
2370 CSTAT(processudp);
2371
2372 udp_rx += len;
2373 udp_rx_pkt++;
2374 LOG_HEX(5, "UDP Data", buf, len);
2375 STAT(tunnel_rx_packets);
2376 INC_STAT(tunnel_rx_bytes, len);
2377 if (len < 6)
2378 {
2379 LOG(1, 0, 0, "Short UDP, %d bytes\n", len);
2380 STAT(tunnel_rx_errors);
2381 return;
2382 }
2383 if ((buf[1] & 0x0F) != 2)
2384 {
2385 LOG(1, 0, 0, "Bad L2TP ver %d\n", buf[1] & 0x0F);
2386 STAT(tunnel_rx_errors);
2387 return;
2388 }
2389 if (*buf & 0x40)
2390 { // length
2391 l = ntohs(*(uint16_t *) p);
2392 p += 2;
2393 }
2394 t = ntohs(*(uint16_t *) p);
2395 p += 2;
2396 s = ntohs(*(uint16_t *) p);
2397 p += 2;
2398 if (s >= MAXSESSION)
2399 {
2400 LOG(1, s, t, "Received UDP packet with invalid session ID\n");
2401 STAT(tunnel_rx_errors);
2402 return;
2403 }
2404 if (t >= MAXTUNNEL)
2405 {
2406 LOG(1, s, t, "Received UDP packet with invalid tunnel ID\n");
2407 STAT(tunnel_rx_errors);
2408 return;
2409 }
2410 if (*buf & 0x08)
2411 { // ns/nr
2412 ns = ntohs(*(uint16_t *) p);
2413 p += 2;
2414 nr = ntohs(*(uint16_t *) p);
2415 p += 2;
2416 }
2417 if (*buf & 0x02)
2418 { // offset
2419 uint16_t o = ntohs(*(uint16_t *) p);
2420 p += o + 2;
2421 }
2422 if ((p - buf) > l)
2423 {
2424 LOG(1, s, t, "Bad length %d>%d\n", (int) (p - buf), l);
2425 STAT(tunnel_rx_errors);
2426 return;
2427 }
2428 l -= (p - buf);
2429
2430 // used to time out old tunnels
2431 if (t && tunnel[t].state == TUNNELOPEN)
2432 tunnel[t].lastrec = time_now;
2433
2434 if (*buf & 0x80)
2435 { // control
2436 uint16_t message = 0xFFFF; // message type
2437 uint8_t fatal = 0;
2438 uint8_t mandatory = 0;
2439 uint16_t asession = 0; // assigned session
2440 uint32_t amagic = 0; // magic number
2441 uint8_t aflags = 0; // flags from last LCF
2442 uint16_t version = 0x0100; // protocol version (we handle 0.0 as well and send that back just in case)
2443 char called[MAXTEL] = ""; // called number
2444 char calling[MAXTEL] = ""; // calling number
2445
2446 if (!config->cluster_iam_master)
2447 {
2448 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
2449 return;
2450 }
2451
2452 // control messages must have bits 0x80|0x40|0x08
2453 // (type, length and sequence) set, and bits 0x02|0x01
2454 // (offset and priority) clear
2455 if ((*buf & 0xCB) != 0xC8)
2456 {
2457 LOG(1, s, t, "Bad control header %02X\n", *buf);
2458 STAT(tunnel_rx_errors);
2459 return;
2460 }
2461
2462 // check for duplicate tunnel open message
2463 if (!t && ns == 0)
2464 {
2465 int i;
2466
2467 //
2468 // Is this a duplicate of the first packet? (SCCRQ)
2469 //
2470 for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
2471 {
2472 if (tunnel[i].state != TUNNELOPENING ||
2473 tunnel[i].ip != ntohl(*(in_addr_t *) & addr->sin_addr) ||
2474 tunnel[i].port != ntohs(addr->sin_port) )
2475 continue;
2476 t = i;
2477 LOG(3, s, t, "Duplicate SCCRQ?\n");
2478 break;
2479 }
2480 }
2481
2482 LOG(3, s, t, "Control message (%d bytes): (unacked %d) l-ns %u l-nr %u r-ns %u r-nr %u\n",
2483 l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
2484
2485 // if no tunnel specified, assign one
2486 if (!t)
2487 {
2488 if (!(t = new_tunnel()))
2489 {
2490 LOG(1, 0, 0, "No more tunnels\n");
2491 STAT(tunnel_overflow);
2492 return;
2493 }
2494 tunnelclear(t);
2495 tunnel[t].ip = ntohl(*(in_addr_t *) & addr->sin_addr);
2496 tunnel[t].port = ntohs(addr->sin_port);
2497 tunnel[t].window = 4; // default window
2498 STAT(tunnel_created);
2499 LOG(1, 0, t, " New tunnel from %s:%u ID %u\n",
2500 fmtaddr(htonl(tunnel[t].ip), 0), tunnel[t].port, t);
2501 }
2502
2503 // If the 'ns' just received is not the 'nr' we're
2504 // expecting, just send an ack and drop it.
2505 //
2506 // if 'ns' is less, then we got a retransmitted packet.
2507 // if 'ns' is greater than missed a packet. Either way
2508 // we should ignore it.
2509 if (ns != tunnel[t].nr)
2510 {
2511 // is this the sequence we were expecting?
2512 STAT(tunnel_rx_errors);
2513 LOG(1, 0, t, " Out of sequence tunnel %u, (%u is not the expected %u)\n",
2514 t, ns, tunnel[t].nr);
2515
2516 if (l) // Is this not a ZLB?
2517 controlnull(t);
2518 return;
2519 }
2520
2521 // check sequence of this message
2522 {
2523 int skip = tunnel[t].window; // track how many in-window packets are still in queue
2524 // some to clear maybe?
2525 while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
2526 {
2527 controlt *c = tunnel[t].controls;
2528 tunnel[t].controls = c->next;
2529 tunnel[t].controlc--;
2530 c->next = controlfree;
2531 controlfree = c;
2532 skip--;
2533 tunnel[t].try = 0; // we have progress
2534 }
2535
2536 // receiver advance (do here so quoted correctly in any sends below)
2537 if (l) tunnel[t].nr = (ns + 1);
2538 if (skip < 0) skip = 0;
2539 if (skip < tunnel[t].controlc)
2540 {
2541 // some control packets can now be sent that were previous stuck out of window
2542 int tosend = tunnel[t].window - skip;
2543 controlt *c = tunnel[t].controls;
2544 while (c && skip)
2545 {
2546 c = c->next;
2547 skip--;
2548 }
2549 while (c && tosend)
2550 {
2551 tunnel[t].try = 0; // first send
2552 tunnelsend(c->buf, c->length, t);
2553 c = c->next;
2554 tosend--;
2555 }
2556 }
2557 if (!tunnel[t].controlc)
2558 tunnel[t].retry = 0; // caught up
2559 }
2560 if (l)
2561 { // if not a null message
2562 int result = 0;
2563 int error = 0;
2564 char *msg = 0;
2565
2566 // Default disconnect cause/message on receipt of CDN. Set to
2567 // more specific value from attribute 1 (result code) or 46
2568 // (disconnect cause) if present below.
2569 int disc_cause_set = 0;
2570 int disc_cause = TERM_NAS_REQUEST;
2571 char const *disc_reason = "Closed (Received CDN).";
2572
2573 // process AVPs
2574 while (l && !(fatal & 0x80)) // 0x80 = mandatory AVP
2575 {
2576 uint16_t n = (ntohs(*(uint16_t *) p) & 0x3FF);
2577 uint8_t *b = p;
2578 uint8_t flags = *p;
2579 uint16_t mtype;
2580
2581 if (n > l)
2582 {
2583 LOG(1, s, t, "Invalid length in AVP\n");
2584 STAT(tunnel_rx_errors);
2585 return;
2586 }
2587 p += n; // next
2588 l -= n;
2589 if (flags & 0x3C) // reserved bits, should be clear
2590 {
2591 LOG(1, s, t, "Unrecognised AVP flags %02X\n", *b);
2592 fatal = flags;
2593 result = 2; // general error
2594 error = 3; // reserved field non-zero
2595 msg = 0;
2596 continue; // next
2597 }
2598 b += 2;
2599 if (*(uint16_t *) (b))
2600 {
2601 LOG(2, s, t, "Unknown AVP vendor %u\n", ntohs(*(uint16_t *) (b)));
2602 fatal = flags;
2603 result = 2; // general error
2604 error = 6; // generic vendor-specific error
2605 msg = "unsupported vendor-specific";
2606 continue; // next
2607 }
2608 b += 2;
2609 mtype = ntohs(*(uint16_t *) (b));
2610 b += 2;
2611 n -= 6;
2612
2613 if (flags & 0x40)
2614 {
2615 uint16_t orig_len;
2616
2617 // handle hidden AVPs
2618 if (!*config->l2tp_secret)
2619 {
2620 LOG(1, s, t, "Hidden AVP requested, but no L2TP secret.\n");
2621 fatal = flags;
2622 result = 2; // general error
2623 error = 6; // generic vendor-specific error
2624 msg = "secret not specified";
2625 continue;
2626 }
2627 if (!session[s].random_vector_length)
2628 {
2629 LOG(1, s, t, "Hidden AVP requested, but no random vector.\n");
2630 fatal = flags;
2631 result = 2; // general error
2632 error = 6; // generic
2633 msg = "no random vector";
2634 continue;
2635 }
2636 if (n < 8)
2637 {
2638 LOG(2, s, t, "Short hidden AVP.\n");
2639 fatal = flags;
2640 result = 2; // general error
2641 error = 2; // length is wrong
2642 msg = 0;
2643 continue;
2644 }
2645
2646 // Unhide the AVP
2647 unhide_value(b, n, mtype, session[s].random_vector, session[s].random_vector_length);
2648
2649 orig_len = ntohs(*(uint16_t *) b);
2650 if (orig_len > n + 2)
2651 {
2652 LOG(1, s, t, "Original length %d too long in hidden AVP of length %d; wrong secret?\n",
2653 orig_len, n);
2654
2655 fatal = flags;
2656 result = 2; // general error
2657 error = 2; // length is wrong
2658 msg = 0;
2659 continue;
2660 }
2661
2662 b += 2;
2663 n = orig_len;
2664 }
2665
2666 LOG(4, s, t, " AVP %u (%s) len %d%s%s\n", mtype, l2tp_avp_name(mtype), n,
2667 flags & 0x40 ? ", hidden" : "", flags & 0x80 ? ", mandatory" : "");
2668
2669 switch (mtype)
2670 {
2671 case 0: // message type
2672 message = ntohs(*(uint16_t *) b);
2673 mandatory = flags & 0x80;
2674 LOG(4, s, t, " Message type = %u (%s)\n", message, l2tp_code(message));
2675 break;
2676 case 1: // result code
2677 {
2678 uint16_t rescode = ntohs(*(uint16_t *) b);
2679 char const *resdesc = "(unknown)";
2680 char const *errdesc = NULL;
2681 int cause = 0;
2682
2683 if (message == 4)
2684 { /* StopCCN */
2685 resdesc = l2tp_stopccn_result_code(rescode);
2686 cause = TERM_LOST_SERVICE;
2687 }
2688 else if (message == 14)
2689 { /* CDN */
2690 resdesc = l2tp_cdn_result_code(rescode);
2691 if (rescode == 1)
2692 cause = TERM_LOST_CARRIER;
2693 else
2694 cause = TERM_ADMIN_RESET;
2695 }
2696
2697 LOG(4, s, t, " Result Code %u: %s\n", rescode, resdesc);
2698 if (n >= 4)
2699 {
2700 uint16_t errcode = ntohs(*(uint16_t *)(b + 2));
2701 errdesc = l2tp_error_code(errcode);
2702 LOG(4, s, t, " Error Code %u: %s\n", errcode, errdesc);
2703 }
2704 if (n > 4)
2705 LOG(4, s, t, " Error String: %.*s\n", n-4, b+4);
2706
2707 if (cause && disc_cause_set < mtype) // take cause from attrib 46 in preference
2708 {
2709 disc_cause_set = mtype;
2710 disc_reason = errdesc ? errdesc : resdesc;
2711 disc_cause = cause;
2712 }
2713
2714 break;
2715 }
2716 break;
2717 case 2: // protocol version
2718 {
2719 version = ntohs(*(uint16_t *) (b));
2720 LOG(4, s, t, " Protocol version = %u\n", version);
2721 if (version && version != 0x0100)
2722 { // allow 0.0 and 1.0
2723 LOG(1, s, t, " Bad protocol version %04X\n", version);
2724 fatal = flags;
2725 result = 5; // unspported protocol version
2726 error = 0x0100; // supported version
2727 msg = 0;
2728 continue; // next
2729 }
2730 }
2731 break;
2732 case 3: // framing capabilities
2733 break;
2734 case 4: // bearer capabilities
2735 break;
2736 case 5: // tie breaker
2737 // We never open tunnels, so we don't care about tie breakers
2738 continue;
2739 case 6: // firmware revision
2740 break;
2741 case 7: // host name
2742 memset(tunnel[t].hostname, 0, sizeof(tunnel[t].hostname));
2743 memcpy(tunnel[t].hostname, b, (n < sizeof(tunnel[t].hostname)) ? n : sizeof(tunnel[t].hostname) - 1);
2744 LOG(4, s, t, " Tunnel hostname = \"%s\"\n", tunnel[t].hostname);
2745 // TBA - to send to RADIUS
2746 break;
2747 case 8: // vendor name
2748 memset(tunnel[t].vendor, 0, sizeof(tunnel[t].vendor));
2749 memcpy(tunnel[t].vendor, b, (n < sizeof(tunnel[t].vendor)) ? n : sizeof(tunnel[t].vendor) - 1);
2750 LOG(4, s, t, " Vendor name = \"%s\"\n", tunnel[t].vendor);
2751 break;
2752 case 9: // assigned tunnel
2753 tunnel[t].far = ntohs(*(uint16_t *) (b));
2754 LOG(4, s, t, " Remote tunnel id = %u\n", tunnel[t].far);
2755 break;
2756 case 10: // rx window
2757 tunnel[t].window = ntohs(*(uint16_t *) (b));
2758 if (!tunnel[t].window)
2759 tunnel[t].window = 1; // window of 0 is silly
2760 LOG(4, s, t, " rx window = %u\n", tunnel[t].window);
2761 break;
2762 case 11: // Challenge
2763 {
2764 LOG(4, s, t, " LAC requested CHAP authentication for tunnel\n");
2765 build_chap_response(b, 2, n, &chapresponse);
2766 }
2767 break;
2768 case 13: // Response
2769 #ifdef LAC
2770 if (tunnel[t].isremotelns)
2771 {
2772 chapresponse = calloc(17, 1);
2773 memcpy(chapresponse, b, (n < 17) ? n : 16);
2774 LOG(3, s, t, "received challenge response from REMOTE LNS\n");
2775 }
2776 else
2777 #endif /* LAC */
2778 // Why did they send a response? We never challenge.
2779 LOG(2, s, t, " received unexpected challenge response\n");
2780 break;
2781
2782 case 14: // assigned session
2783 asession = session[s].far = ntohs(*(uint16_t *) (b));
2784 LOG(4, s, t, " assigned session = %u\n", asession);
2785 break;
2786 case 15: // call serial number
2787 LOG(4, s, t, " call serial number = %u\n", ntohl(*(uint32_t *)b));
2788 break;
2789 case 18: // bearer type
2790 LOG(4, s, t, " bearer type = %u\n", ntohl(*(uint32_t *)b));
2791 // TBA - for RADIUS
2792 break;
2793 case 19: // framing type
2794 LOG(4, s, t, " framing type = %u\n", ntohl(*(uint32_t *)b));
2795 // TBA
2796 break;
2797 case 21: // called number
2798 memset(called, 0, sizeof(called));
2799 memcpy(called, b, (n < sizeof(called)) ? n : sizeof(called) - 1);
2800 LOG(4, s, t, " Called <%s>\n", called);
2801 break;
2802 case 22: // calling number
2803 memset(calling, 0, sizeof(calling));
2804 memcpy(calling, b, (n < sizeof(calling)) ? n : sizeof(calling) - 1);
2805 LOG(4, s, t, " Calling <%s>\n", calling);
2806 break;
2807 case 23: // subtype
2808 break;
2809 case 24: // tx connect speed
2810 if (n == 4)
2811 {
2812 session[s].tx_connect_speed = ntohl(*(uint32_t *)b);
2813 }
2814 else
2815 {
2816 // AS5300s send connect speed as a string
2817 char tmp[30];
2818 memset(tmp, 0, sizeof(tmp));
2819 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2820 session[s].tx_connect_speed = atol(tmp);
2821 }
2822 LOG(4, s, t, " TX connect speed <%u>\n", session[s].tx_connect_speed);
2823 break;
2824 case 38: // rx connect speed
2825 if (n == 4)
2826 {
2827 session[s].rx_connect_speed = ntohl(*(uint32_t *)b);
2828 }
2829 else
2830 {
2831 // AS5300s send connect speed as a string
2832 char tmp[30];
2833 memset(tmp, 0, sizeof(tmp));
2834 memcpy(tmp, b, (n < sizeof(tmp)) ? n : sizeof(tmp) - 1);
2835 session[s].rx_connect_speed = atol(tmp);
2836 }
2837 LOG(4, s, t, " RX connect speed <%u>\n", session[s].rx_connect_speed);
2838 break;
2839 case 25: // Physical Channel ID
2840 {
2841 uint32_t tmp = ntohl(*(uint32_t *) b);
2842 LOG(4, s, t, " Physical Channel ID <%X>\n", tmp);
2843 break;
2844 }
2845 case 29: // Proxy Authentication Type
2846 {
2847 uint16_t atype = ntohs(*(uint16_t *)b);
2848 LOG(4, s, t, " Proxy Auth Type %u (%s)\n", atype, ppp_auth_type(atype));
2849 break;
2850 }
2851 case 30: // Proxy Authentication Name
2852 {
2853 char authname[64];
2854 memset(authname, 0, sizeof(authname));
2855 memcpy(authname, b, (n < sizeof(authname)) ? n : sizeof(authname) - 1);
2856 LOG(4, s, t, " Proxy Auth Name (%s)\n",
2857 authname);
2858 break;
2859 }
2860 case 31: // Proxy Authentication Challenge
2861 {
2862 LOG(4, s, t, " Proxy Auth Challenge\n");
2863 break;
2864 }
2865 case 32: // Proxy Authentication ID
2866 {
2867 uint16_t authid = ntohs(*(uint16_t *)(b));
2868 LOG(4, s, t, " Proxy Auth ID (%u)\n", authid);
2869 break;
2870 }
2871 case 33: // Proxy Authentication Response
2872 LOG(4, s, t, " Proxy Auth Response\n");
2873 break;
2874 case 27: // last sent lcp
2875 { // find magic number
2876 uint8_t *p = b, *e = p + n;
2877 while (p + 1 < e && p[1] && p + p[1] <= e)
2878 {
2879 if (*p == 5 && p[1] == 6) // Magic-Number
2880 amagic = ntohl(*(uint32_t *) (p + 2));
2881 else if (*p == 7) // Protocol-Field-Compression
2882 aflags |= SESSION_PFC;
2883 else if (*p == 8) // Address-and-Control-Field-Compression
2884 aflags |= SESSION_ACFC;
2885 p += p[1];
2886 }
2887 }
2888 break;
2889 case 28: // last recv lcp confreq
2890 break;
2891 case 26: // Initial Received LCP CONFREQ
2892 break;
2893 case 39: // seq required - we control it as an LNS anyway...
2894 break;
2895 case 36: // Random Vector
2896 LOG(4, s, t, " Random Vector received. Enabled AVP Hiding.\n");
2897 memset(session[s].random_vector, 0, sizeof(session[s].random_vector));
2898 if (n > sizeof(session[s].random_vector))
2899 n = sizeof(session[s].random_vector);
2900 memcpy(session[s].random_vector, b, n);
2901 session[s].random_vector_length = n;
2902 break;
2903 case 46: // ppp disconnect cause
2904 if (n >= 5)
2905 {
2906 uint16_t code = ntohs(*(uint16_t *) b);
2907 uint16_t proto = ntohs(*(uint16_t *) (b + 2));
2908 uint8_t dir = *(b + 4);
2909
2910 LOG(4, s, t, " PPP disconnect cause "
2911 "(code=%u, proto=%04X, dir=%u, msg=\"%.*s\")\n",
2912 code, proto, dir, n - 5, b + 5);
2913
2914 disc_cause_set = mtype;
2915
2916 switch (code)
2917 {
2918 case 1: // admin disconnect
2919 disc_cause = TERM_ADMIN_RESET;
2920 disc_reason = "Administrative disconnect";
2921 break;
2922 case 3: // lcp terminate
2923 if (dir != 2) break; // 1=peer (LNS), 2=local (LAC)
2924 disc_cause = TERM_USER_REQUEST;
2925 disc_reason = "Normal disconnection";
2926 break;
2927 case 4: // compulsory encryption unavailable
2928 if (dir != 1) break; // 1=refused by peer, 2=local
2929 disc_cause = TERM_USER_ERROR;
2930 disc_reason = "Compulsory encryption refused";
2931 break;
2932 case 5: // lcp: fsm timeout
2933 disc_cause = TERM_PORT_ERROR;
2934 disc_reason = "LCP: FSM timeout";
2935 break;
2936 case 6: // lcp: no recognisable lcp packets received
2937 disc_cause = TERM_PORT_ERROR;
2938 disc_reason = "LCP: no recognisable LCP packets";
2939 break;
2940 case 7: // lcp: magic-no error (possibly looped back)
2941 disc_cause = TERM_PORT_ERROR;
2942 disc_reason = "LCP: magic-no error (possible loop)";
2943 break;
2944 case 8: // lcp: echo request timeout
2945 disc_cause = TERM_PORT_ERROR;
2946 disc_reason = "LCP: echo request timeout";
2947 break;
2948 case 13: // auth: fsm timeout
2949 disc_cause = TERM_SERVICE_UNAVAILABLE;
2950 disc_reason = "Authentication: FSM timeout";
2951 break;
2952 case 15: // auth: unacceptable auth protocol
2953 disc_cause = TERM_SERVICE_UNAVAILABLE;
2954 disc_reason = "Unacceptable authentication protocol";
2955 break;
2956 case 16: // auth: authentication failed
2957 disc_cause = TERM_SERVICE_UNAVAILABLE;
2958 disc_reason = "Authentication failed";
2959 break;
2960 case 17: // ncp: fsm timeout
2961 disc_cause = TERM_SERVICE_UNAVAILABLE;
2962 disc_reason = "NCP: FSM timeout";
2963 break;
2964 case 18: // ncp: no ncps available
2965 disc_cause = TERM_SERVICE_UNAVAILABLE;
2966 disc_reason = "NCP: no NCPs available";
2967 break;
2968 case 19: // ncp: failure to converge on acceptable address
2969 disc_cause = TERM_SERVICE_UNAVAILABLE;
2970 disc_reason = (dir == 1)
2971 ? "NCP: too many Configure-Naks received from peer"
2972 : "NCP: too many Configure-Naks sent to peer";
2973 break;
2974 case 20: // ncp: user not permitted to use any address
2975 disc_cause = TERM_SERVICE_UNAVAILABLE;
2976 disc_reason = (dir == 1)
2977 ? "NCP: local link address not acceptable to peer"
2978 : "NCP: remote link address not acceptable";
2979 break;
2980 }
2981 }
2982 break;
2983 default:
2984 {
2985 static char e[] = "unknown AVP 0xXXXX";
2986 LOG(2, s, t, " Unknown AVP type %u\n", mtype);
2987 fatal = flags;
2988 result = 2; // general error
2989 error = 8; // unknown mandatory AVP
2990 sprintf((msg = e) + 14, "%04x", mtype);
2991 continue; // next
2992 }
2993 }
2994 }
2995 // process message
2996 if (fatal & 0x80)
2997 tunnelshutdown(t, "Invalid mandatory AVP", result, error, msg);
2998 else
2999 switch (message)
3000 {
3001 case 1: // SCCRQ - Start Control Connection Request
3002 tunnel[t].state = TUNNELOPENING;
3003 LOG(3, s, t, "Received SCCRQ\n");
3004 if (main_quit != QUIT_SHUTDOWN)
3005 {
3006 LOG(3, s, t, "sending SCCRP\n");
3007 controlt *c = controlnew(2); // sending SCCRP
3008 control16(c, 2, version, 1); // protocol version
3009 control32(c, 3, 3, 1); // framing
3010 controls(c, 7, hostname, 1); // host name
3011 if (chapresponse) controlb(c, 13, chapresponse, 16, 1); // Challenge response
3012 control16(c, 9, t, 1); // assigned tunnel
3013 controladd(c, 0, t); // send the resply
3014 }
3015 else
3016 {
3017 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3018 }
3019 break;
3020 case 2: // SCCRP
3021 tunnel[t].state = TUNNELOPEN;
3022 tunnel[t].lastrec = time_now;
3023 #ifdef LAC
3024 LOG(3, s, t, "Received SCCRP\n");
3025 if (main_quit != QUIT_SHUTDOWN)
3026 {
3027 if (tunnel[t].isremotelns && chapresponse)
3028 {
3029 hasht hash;
3030
3031 lac_calc_rlns_auth(t, 2, hash); // id = 2 (SCCRP)
3032 // check authenticator
3033 if (memcmp(hash, chapresponse, 16) == 0)
3034 {
3035 LOG(3, s, t, "sending SCCCN to REMOTE LNS\n");
3036 controlt *c = controlnew(3); // sending SCCCN
3037 controls(c, 7, hostname, 1); // host name
3038 controls(c, 8, Vendor_name, 1); // Vendor name
3039 control16(c, 2, version, 1); // protocol version
3040 control32(c, 3, 3, 1); // framing Capabilities
3041 control16(c, 9, t, 1); // assigned tunnel
3042 controladd(c, 0, t); // send
3043 }
3044 else
3045 {
3046 tunnelshutdown(t, "Bad chap response from REMOTE LNS", 4, 0, 0);
3047 }
3048 }
3049 }
3050 else
3051 {
3052 tunnelshutdown(t, "Shutting down", 6, 0, 0);
3053 }
3054 #endif /* LAC */
3055 break;
3056 case 3: // SCCN
3057 LOG(3, s, t, "Received SCCN\n");
3058 tunnel[t].state = TUNNELOPEN;
3059 tunnel[t].lastrec = time_now;
3060 controlnull(t); // ack
3061 break;
3062 case 4: // StopCCN
3063 LOG(3, s, t, "Received StopCCN\n");
3064 controlnull(t); // ack
3065 tunnelshutdown(t, "Stopped", 0, 0, 0); // Shut down cleanly
3066 break;
3067 case 6: // HELLO
3068 LOG(3, s, t, "Received HELLO\n");
3069 controlnull(t); // simply ACK
3070 break;
3071 case 7: // OCRQ
3072 // TBA
3073 LOG(3, s, t, "Received OCRQ\n");
3074 break;
3075 case 8: // OCRO
3076 // TBA
3077 LOG(3, s, t, "Received OCRO\n");
3078 break;
3079 case 9: // OCCN
3080 // TBA
3081 LOG(3, s, t, "Received OCCN\n");
3082 break;
3083 case 10: // ICRQ
3084 LOG(3, s, t, "Received ICRQ\n");
3085 if (sessionfree && main_quit != QUIT_SHUTDOWN)
3086 {
3087 controlt *c = controlnew(11); // ICRP
3088
3089 LOG(3, s, t, "Sending ICRP\n");
3090
3091 s = sessionfree;
3092 sessionfree = session[s].next;
3093 memset(&session[s], 0, sizeof(session[s]));
3094
3095 if (s > config->cluster_highest_sessionid)
3096 config->cluster_highest_sessionid = s;
3097
3098 session[s].opened = time_now;
3099 session[s].tunnel = t;
3100 session[s].far = asession;
3101 session[s].last_packet = session[s].last_data = time_now;
3102 LOG(3, s, t, "New session (%u/%u)\n", tunnel[t].far, session[s].far);
3103 control16(c, 14, s, 1); // assigned session
3104 controladd(c, asession, t); // send the reply
3105
3106 strncpy(session[s].called, called, sizeof(session[s].called) - 1);
3107 strncpy(session[s].calling, calling, sizeof(session[s].calling) - 1);
3108
3109 session[s].ppp.phase = Establish;
3110 session[s].ppp.lcp = Starting;
3111
3112 STAT(session_created);
3113 break;
3114 }
3115
3116 {
3117 controlt *c = controlnew(14); // CDN
3118 LOG(3, s, t, "Sending CDN\n");
3119 if (!sessionfree)
3120 {
3121 STAT(session_overflow);
3122 LOG(1, 0, t, "No free sessions\n");
3123 control16(c, 1, 4, 0); // temporary lack of resources
3124 }
3125 else
3126 control16(c, 1, 2, 7); // shutting down, try another
3127
3128 controladd(c, asession, t); // send the message
3129 }
3130 return;
3131 case 11: // ICRP
3132 #ifdef LAC
3133 LOG(3, s, t, "Received ICRP\n");
3134 if (session[s].forwardtosession)
3135 {
3136 controlt *c = controlnew(12); // ICCN
3137
3138 session[s].opened = time_now;
3139 session[s].tunnel = t;
3140 session[s].far = asession;
3141 session[s].last_packet = session[s].last_data = time_now;
3142
3143 control32(c, 19, 1, 1); // Framing Type
3144 control32(c, 24, 10000000, 1); // Tx Connect Speed
3145 controladd(c, asession, t); // send the message
3146 LOG(3, s, t, "Sending ICCN\n");
3147 }
3148 #endif /* LAC */
3149 break;
3150 case 12: // ICCN
3151 LOG(3, s, t, "Received ICCN\n");
3152 if (amagic == 0) amagic = time_now;
3153 session[s].magic = amagic; // set magic number
3154 session[s].flags = aflags; // set flags received
3155 session[s].mru = PPPoE_MRU; // default
3156 controlnull(t); // ack
3157
3158 // start LCP
3159 sess_local[s].lcp_authtype = config->radius_authprefer;
3160 sess_local[s].ppp_mru = MRU;
3161
3162 // Set multilink options before sending initial LCP packet
3163 sess_local[s].mp_mrru = 1614;
3164 sess_local[s].mp_epdis = ntohl(config->iftun_address ? config->iftun_address : my_address);
3165
3166 sendlcp(s, t);
3167 change_state(s, lcp, RequestSent);
3168 break;
3169
3170 case 14: // CDN
3171 LOG(3, s, t, "Received CDN\n");
3172 controlnull(t); // ack
3173 sessionshutdown(s, disc_reason, CDN_NONE, disc_cause);
3174 break;
3175 case 0xFFFF:
3176 LOG(1, s, t, "Missing message type\n");
3177 break;
3178 default:
3179 STAT(tunnel_rx_errors);
3180 if (mandatory)
3181 tunnelshutdown(t, "Unknown message type", 2, 6, "unknown message type");
3182 else
3183 LOG(1, s, t, "Unknown message type %u\n", message);
3184 break;
3185 }
3186 if (chapresponse) free(chapresponse);
3187 cluster_send_tunnel(t);
3188 }
3189 else
3190 {
3191 LOG(4, s, t, " Got a ZLB ack\n");
3192 }
3193 }
3194 else
3195 { // data
3196 uint16_t proto;
3197
3198 LOG_HEX(5, "Receive Tunnel Data", p, l);
3199 if (l > 2 && p[0] == 0xFF && p[1] == 0x03)
3200 { // HDLC address header, discard
3201 p += 2;
3202 l -= 2;
3203 }
3204 if (l < 2)
3205 {
3206 LOG(1, s, t, "Short ppp length %d\n", l);
3207 STAT(tunnel_rx_errors);
3208 return;
3209 }
3210 if (*p & 1)
3211 {
3212 proto = *p++;
3213 l--;
3214 }
3215 else
3216 {
3217 proto = ntohs(*(uint16_t *) p);
3218 p += 2;
3219 l -= 2;
3220 }
3221
3222 #ifdef LAC
3223 if (session[s].forwardtosession)
3224 {
3225 LOG(5, s, t, "Forwarding data session to session %u\n", session[s].forwardtosession);
3226 // Forward to LAC or Remote LNS session
3227 lac_session_forward(buf, len, s, proto);
3228 return;
3229 }
3230 #endif /* LAC */
3231
3232 if (s && !session[s].opened) // Is something wrong??
3233 {
3234 if (!config->cluster_iam_master)
3235 {
3236 // Pass it off to the master to deal with..
3237 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3238 return;
3239 }
3240
3241 LOG(1, s, t, "UDP packet contains session which is not opened. Dropping packet.\n");
3242 STAT(tunnel_rx_errors);
3243 return;
3244 }
3245
3246 if (proto == PPPPAP)
3247 {
3248 session[s].last_packet = time_now;
3249 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3250 processpap(s, t, p, l);
3251 }
3252 else if (proto == PPPCHAP)
3253 {
3254 session[s].last_packet = time_now;
3255 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3256 processchap(s, t, p, l);
3257 }
3258 else if (proto == PPPLCP)
3259 {
3260 session[s].last_packet = time_now;
3261 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3262 processlcp(s, t, p, l);
3263 }
3264 else if (proto == PPPIPCP)
3265 {
3266 session[s].last_packet = time_now;
3267 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3268 processipcp(s, t, p, l);
3269 }
3270 else if (proto == PPPIPV6CP && config->ipv6_prefix.s6_addr[0])
3271 {
3272 session[s].last_packet = time_now;
3273 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3274 processipv6cp(s, t, p, l);
3275 }
3276 else if (proto == PPPCCP)
3277 {
3278 session[s].last_packet = time_now;
3279 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3280 processccp(s, t, p, l);
3281 }
3282 else if (proto == PPPIP)
3283 {
3284 if (session[s].die)
3285 {
3286 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3287 return; // closing session, PPP not processed
3288 }
3289
3290 session[s].last_packet = session[s].last_data = time_now;
3291 if (session[s].walled_garden && !config->cluster_iam_master)
3292 {
3293 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3294 return;
3295 }
3296
3297 processipin(s, t, p, l);
3298 }
3299 else if (proto == PPPMP)
3300 {
3301 if (session[s].die)
3302 {
3303 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3304 return; // closing session, PPP not processed
3305 }
3306
3307 session[s].last_packet = session[s].last_data = time_now;
3308 if (!config->cluster_iam_master)
3309 {
3310 // The fragments reconstruction is managed by the Master.
3311 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3312 return;
3313 }
3314
3315 processmpin(s, t, p, l);
3316 }
3317 else if (proto == PPPIPV6 && config->ipv6_prefix.s6_addr[0])
3318 {
3319 if (session[s].die)
3320 {
3321 LOG(4, s, t, "Session %u is closing. Don't process PPP packets\n", s);
3322 return; // closing session, PPP not processed
3323 }
3324
3325 session[s].last_packet = session[s].last_data = time_now;
3326 if (session[s].walled_garden && !config->cluster_iam_master)
3327 {
3328 master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
3329 return;
3330 }
3331
3332 processipv6in(s, t, p, l);
3333 }
3334 else if (session[s].ppp.lcp == Opened)
3335 {
3336 session[s].last_packet = time_now;
3337 if (!config->cluster_iam_master) { master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port); return; }
3338 protoreject(s, t, p, l, proto);
3339 }
3340 else
3341 {
3342 LOG(2, s, t, "Unknown PPP protocol 0x%04X received in LCP %s state\n",
3343 proto, ppp_state(session[s].ppp.lcp));
3344 }
3345 }
3346 }
3347
3348 // read and process packet on tun
3349 // (i.e. this routine writes to buf[-8]).
3350 static void processtun(uint8_t * buf, int len)
3351 {
3352 LOG_HEX(5, "Receive TUN Data", buf, len);
3353 STAT(tun_rx_packets);
3354 INC_STAT(tun_rx_bytes, len);
3355
3356 CSTAT(processtun);
3357
3358 eth_rx_pkt++;
3359 eth_rx += len;
3360 if (len < 22)
3361 {
3362 LOG(1, 0, 0, "Short tun packet %d bytes\n", len);
3363 STAT(tun_rx_errors);
3364 return;
3365 }
3366
3367 if (*(uint16_t *) (buf + 2) == htons(PKTIP)) // IPv4
3368 processipout(buf, len);
3369 else if (*(uint16_t *) (buf + 2) == htons(PKTIPV6) // IPV6
3370 && config->ipv6_prefix.s6_addr[0])
3371 processipv6out(buf, len);
3372
3373 // Else discard.
3374 }
3375
3376 // Handle retries, timeouts. Runs every 1/10th sec, want to ensure
3377 // that we look at the whole of the tunnel, radius and session tables
3378 // every second
3379 static void regular_cleanups(double period)
3380 {
3381 // Next tunnel, radius and session to check for actions on.
3382 static tunnelidt t = 0;
3383 static int r = 0;
3384 static sessionidt s = 0;
3385
3386 int t_actions = 0;
3387 int r_actions = 0;
3388 int s_actions = 0;
3389
3390 int t_slice;
3391 int r_slice;
3392 int s_slice;
3393
3394 int i;
3395 int a;
3396
3397 // divide up tables into slices based on the last run
3398 t_slice = config->cluster_highest_tunnelid * period;
3399 r_slice = (MAXRADIUS - 1) * period;
3400 s_slice = config->cluster_highest_sessionid * period;
3401
3402 if (t_slice < 1)
3403 t_slice = 1;
3404 else if (t_slice > config->cluster_highest_tunnelid)
3405 t_slice = config->cluster_highest_tunnelid;
3406
3407 if (r_slice < 1)
3408 r_slice = 1;
3409 else if (r_slice > (MAXRADIUS - 1))
3410 r_slice = MAXRADIUS - 1;
3411
3412 if (s_slice < 1)
3413 s_slice = 1;
3414 else if (s_slice > config->cluster_highest_sessionid)
3415 s_slice = config->cluster_highest_sessionid;
3416
3417 LOG(4, 0, 0, "Begin regular cleanup (last %f seconds ago)\n", period);
3418
3419 for (i = 0; i < t_slice; i++)
3420 {
3421 t++;
3422 if (t > config->cluster_highest_tunnelid)
3423 t = 1;
3424
3425 // check for expired tunnels
3426 if (tunnel[t].die && tunnel[t].die <= TIME)
3427 {
3428 STAT(tunnel_timeout);
3429 tunnelkill(t, "Expired");
3430 t_actions++;
3431 continue;
3432 }
3433 // check for message resend
3434 if (tunnel[t].retry && tunnel[t].controlc)
3435 {
3436 // resend pending messages as timeout on reply
3437 if (tunnel[t].retry <= TIME)
3438 {
3439 controlt *c = tunnel[t].controls;
3440 uint16_t w = tunnel[t].window;
3441 tunnel[t].try++; // another try
3442 if (tunnel[t].try > 5)
3443 tunnelkill(t, "Timeout on control message"); // game over
3444 else
3445 while (c && w--)
3446 {
3447 tunnelsend(c->buf, c->length, t);
3448 c = c->next;
3449 }
3450
3451 t_actions++;
3452 }
3453 }
3454 // Send hello
3455 if (tunnel[t].state == TUNNELOPEN && !tunnel[t].controlc && (time_now - tunnel[t].lastrec) > 60)
3456 {
3457 controlt *c = controlnew(6); // sending HELLO
3458 controladd(c, 0, t); // send the message
3459 LOG(3, 0, t, "Sending HELLO message\n");
3460 t_actions++;
3461 }
3462
3463 // Check for tunnel changes requested from the CLI
3464 if ((a = cli_tunnel_actions[t].action))
3465 {
3466 cli_tunnel_actions[t].action = 0;
3467 if (a & CLI_TUN_KILL)
3468 {
3469 LOG(2, 0, t, "Dropping tunnel by CLI\n");
3470 tunnelshutdown(t, "Requested by administrator", 1, 0, 0);
3471 t_actions++;
3472 }
3473 }
3474 }
3475
3476 for (i = 0; i < r_slice; i++)
3477 {
3478 r++;
3479 if (r >= MAXRADIUS)
3480 r = 1;
3481
3482 if (!radius[r].state)
3483 continue;
3484
3485 if (radius[r].retry <= TIME)
3486 {
3487 radiusretry(r);
3488 r_actions++;
3489 }
3490 }
3491
3492 for (i = 0; i < s_slice; i++)
3493 {
3494 s++;
3495 if (s > config->cluster_highest_sessionid)
3496 s = 1;
3497
3498 if (!session[s].opened) // Session isn't in use
3499 continue;
3500
3501 // check for expired sessions
3502 if (session[s].die)
3503 {
3504 if (session[s].die <= TIME)
3505 {
3506 sessionkill(s, "Expired");
3507 s_actions++;
3508 }
3509 continue;
3510 }
3511
3512 // PPP timeouts
3513 if (sess_local[s].lcp.restart <= time_now)
3514 {
3515 int next_state = session[s].ppp.lcp;
3516 switch (session[s].ppp.lcp)
3517 {
3518 case RequestSent:
3519 case AckReceived:
3520 next_state = RequestSent;
3521
3522 case AckSent:
3523 if (sess_local[s].lcp.conf_sent < config->ppp_max_configure)
3524 {
3525 LOG(3, s, session[s].tunnel, "No ACK for LCP ConfigReq... resending\n");
3526 sendlcp(s, session[s].tunnel);
3527 change_state(s, lcp, next_state);
3528 }
3529 else
3530 {
3531 sessionshutdown(s, "No response to LCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3532 STAT(session_timeout);
3533 }
3534
3535 s_actions++;
3536 }
3537
3538 if (session[s].die)
3539 continue;
3540 }
3541
3542 if (sess_local[s].ipcp.restart <= time_now)
3543 {
3544 int next_state = session[s].ppp.ipcp;
3545 switch (session[s].ppp.ipcp)
3546 {
3547 case RequestSent:
3548 case AckReceived:
3549 next_state = RequestSent;
3550
3551 case AckSent:
3552 if (sess_local[s].ipcp.conf_sent < config->ppp_max_configure)
3553 {
3554 LOG(3, s, session[s].tunnel, "No ACK for IPCP ConfigReq... resending\n");
3555 sendipcp(s, session[s].tunnel);
3556 change_state(s, ipcp, next_state);
3557 }
3558 else
3559 {
3560 sessionshutdown(s, "No response to IPCP ConfigReq.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3561 STAT(session_timeout);
3562 }
3563
3564 s_actions++;
3565 }
3566
3567 if (session[s].die)
3568 continue;
3569 }
3570
3571 if (sess_local[s].ipv6cp.restart <= time_now)
3572 {
3573 int next_state = session[s].ppp.ipv6cp;
3574 switch (session[s].ppp.ipv6cp)
3575 {
3576 case RequestSent:
3577 case AckReceived:
3578 next_state = RequestSent;
3579
3580 case AckSent:
3581 if (sess_local[s].ipv6cp.conf_sent < config->ppp_max_configure)
3582 {
3583 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq... resending\n");
3584 sendipv6cp(s, session[s].tunnel);
3585 change_state(s, ipv6cp, next_state);
3586 }
3587 else
3588 {
3589 LOG(3, s, session[s].tunnel, "No ACK for IPV6CP ConfigReq\n");
3590 change_state(s, ipv6cp, Stopped);
3591 }
3592
3593 s_actions++;
3594 }
3595 }
3596
3597 if (sess_local[s].ccp.restart <= time_now)
3598 {
3599 int next_state = session[s].ppp.ccp;
3600 switch (session[s].ppp.ccp)
3601 {
3602 case RequestSent:
3603 case AckReceived:
3604 next_state = RequestSent;
3605
3606 case AckSent:
3607 if (sess_local[s].ccp.conf_sent < config->ppp_max_configure)
3608 {
3609 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq... resending\n");
3610 sendccp(s, session[s].tunnel);
3611 change_state(s, ccp, next_state);
3612 }
3613 else
3614 {
3615 LOG(3, s, session[s].tunnel, "No ACK for CCP ConfigReq\n");
3616 change_state(s, ccp, Stopped);
3617 }
3618
3619 s_actions++;
3620 }
3621 }
3622
3623 // Drop sessions who have not responded within IDLE_ECHO_TIMEOUT seconds
3624 if (session[s].last_packet && (time_now - session[s].last_packet >= config->idle_echo_timeout))
3625 {
3626 sessionshutdown(s, "No response to LCP ECHO requests.", CDN_ADMIN_DISC, TERM_LOST_SERVICE);
3627 STAT(session_timeout);
3628 s_actions++;
3629 continue;
3630 }
3631
3632 // No data in ECHO_TIMEOUT seconds, send LCP ECHO
3633 if (session[s].ppp.phase >= Establish && (time_now - session[s].last_packet >= config->echo_timeout) &&
3634 (time_now - sess_local[s].last_echo >= ECHO_TIMEOUT))
3635 {
3636 uint8_t b[MAXETHER];
3637
3638 uint8_t *q = makeppp(b, sizeof(b), 0, 0, s, session[s].tunnel, PPPLCP, 1, 0, 0);
3639 if (!q) continue;
3640
3641 *q = EchoReq;
3642 *(uint8_t *)(q + 1) = (time_now % 255); // ID
3643 *(uint16_t *)(q + 2) = htons(8); // Length
3644 *(uint32_t *)(q + 4) = session[s].ppp.lcp == Opened ? htonl(session[s].magic) : 0; // Magic Number
3645
3646 LOG(4, s, session[s].tunnel, "No data in %d seconds, sending LCP ECHO\n",
3647 (int)(time_now - session[s].last_packet));
3648 tunnelsend(b, 24, session[s].tunnel); // send it
3649 sess_local[s].last_echo = time_now;
3650 s_actions++;
3651 }
3652
3653 // Drop sessions who have reached session_timeout seconds
3654 if (session[s].session_timeout)
3655 {
3656 bundleidt bid = session[s].bundle;
3657 if (bid)
3658 {
3659 if (time_now - bundle[bid].last_check >= 1)
3660 {
3661 bundle[bid].online_time += (time_now - bundle[bid].last_check) * bundle[bid].num_of_links;
3662 bundle[bid].last_check = time_now;
3663 if (bundle[bid].online_time >= session[s].session_timeout)
3664 {
3665 int ses;
3666 for (ses = bundle[bid].num_of_links - 1; ses >= 0; ses--)
3667 {
3668 sessionshutdown(bundle[bid].members[ses], "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3669 s_actions++;
3670 continue;
3671 }
3672 }
3673 }
3674 }
3675 else if (time_now - session[s].opened >= session[s].session_timeout)
3676 {
3677 sessionshutdown(s, "Session timeout", CDN_ADMIN_DISC, TERM_SESSION_TIMEOUT);
3678 s_actions++;
3679 continue;
3680 }
3681 }
3682
3683 // Drop sessions who have reached idle_timeout seconds
3684 if (session[s].last_data && session[s].idle_timeout && (time_now - session[s].last_data >= session[s].idle_timeout))
3685 {
3686 sessionshutdown(s, "Idle Timeout Reached", CDN_ADMIN_DISC, TERM_IDLE_TIMEOUT);
3687 STAT(session_timeout);
3688 s_actions++;
3689 continue;
3690 }
3691
3692 // Check for actions requested from the CLI
3693 if ((a = cli_session_actions[s].action))
3694 {
3695 int send = 0;
3696
3697 cli_session_actions[s].action = 0;
3698 if (a & CLI_SESS_KILL)
3699 {
3700 LOG(2, s, session[s].tunnel, "Dropping session by CLI\n");
3701 sessionshutdown(s, "Requested by administrator.", CDN_ADMIN_DISC, TERM_ADMIN_RESET);
3702 a = 0; // dead, no need to check for other actions
3703 s_actions++;
3704 }
3705
3706 if (a & CLI_SESS_NOSNOOP)
3707 {
3708 LOG(2, s, session[s].tunnel, "Unsnooping session by CLI\n");
3709 session[s].snoop_ip = 0;
3710 session[s].snoop_port = 0;
3711 s_actions++;
3712 send++;
3713 }
3714 else if (a & CLI_SESS_SNOOP)
3715 {
3716 LOG(2, s, session[s].tunnel, "Snooping session by CLI (to %s:%u)\n",
3717 fmtaddr(cli_session_actions[s].snoop_ip, 0),
3718 cli_session_actions[s].snoop_port);
3719
3720 session[s].snoop_ip = cli_session_actions[s].snoop_ip;
3721 session[s].snoop_port = cli_session_actions[s].snoop_port;
3722 s_actions++;
3723 send++;
3724 }
3725
3726 if (a & CLI_SESS_NOTHROTTLE)
3727 {
3728 LOG(2, s, session[s].tunnel, "Un-throttling session by CLI\n");
3729 throttle_session(s, 0, 0);
3730 s_actions++;
3731 send++;
3732 }
3733 else if (a & CLI_SESS_THROTTLE)
3734 {
3735 LOG(2, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
3736 cli_session_actions[s].throttle_in,
3737 cli_session_actions[s].throttle_out);
3738
3739 throttle_session(s, cli_session_actions[s].throttle_in, cli_session_actions[s].throttle_out);
3740 s_actions++;
3741 send++;
3742 }
3743
3744 if (a & CLI_SESS_NOFILTER)
3745 {
3746 LOG(2, s, session[s].tunnel, "Un-filtering session by CLI\n");
3747 filter_session(s, 0, 0);
3748 s_actions++;
3749 send++;
3750 }
3751 else if (a & CLI_SESS_FILTER)
3752 {
3753 LOG(2, s, session[s].tunnel, "Filtering session by CLI (in=%d, out=%d)\n",
3754 cli_session_actions[s].filter_in,
3755 cli_session_actions[s].filter_out);
3756
3757 filter_session(s, cli_session_actions[s].filter_in, cli_session_actions[s].filter_out);
3758 s_actions++;
3759 send++;
3760 }
3761
3762 if (send)
3763 cluster_send_session(s);
3764 }
3765
3766 // RADIUS interim accounting
3767 if (config->radius_accounting && config->radius_interim > 0
3768 && session[s].ip && !session[s].walled_garden
3769 && !sess_local[s].radius // RADIUS already in progress
3770 && time_now - sess_local[s].last_interim >= config->radius_interim
3771 && session[s].flags & SESSION_STARTED)
3772 {
3773 int rad = radiusnew(s);
3774 if (!rad)
3775 {
3776 LOG(1, s, session[s].tunnel, "No free RADIUS sessions for Interim message\n");
3777 STAT(radius_overflow);
3778 continue;
3779 }
3780
3781 LOG(3, s, session[s].tunnel, "Sending RADIUS Interim for %s (%u)\n",
3782 session[s].user, session[s].unique_id);
3783
3784 radiussend(rad, RADIUSINTERIM);
3785 sess_local[s].last_interim = time_now;
3786 s_actions++;
3787 }
3788 }
3789
3790 LOG(4, 0, 0, "End regular cleanup: checked %d/%d/%d tunnels/radius/sessions; %d/%d/%d actions\n",
3791 t_slice, r_slice, s_slice, t_actions, r_actions, s_actions);
3792 }
3793
3794 //
3795 // Are we in the middle of a tunnel update, or radius
3796 // requests??
3797 //
3798 static int still_busy(void)
3799 {
3800 int i;
3801 static clockt last_talked = 0;
3802 static clockt start_busy_wait = 0;
3803
3804 #ifdef BGP
3805 static time_t stopped_bgp = 0;
3806 if (bgp_configured)
3807 {
3808 if (!stopped_bgp)
3809 {
3810 LOG(1, 0, 0, "Shutting down in %d seconds, stopping BGP...\n", QUIT_DELAY);
3811
3812 for (i = 0; i < BGP_NUM_PEERS; i++)
3813 if (bgp_peers[i].state == Established)
3814 bgp_stop(&bgp_peers[i]);
3815
3816 stopped_bgp = time_now;
3817
3818 if (!config->cluster_iam_master)
3819 {
3820 // we don't want to become master
3821 cluster_send_ping(0);
3822
3823 return 1;
3824 }
3825 }
3826
3827 if (!config->cluster_iam_master && time_now < (stopped_bgp + QUIT_DELAY))
3828 return 1;
3829 }
3830 #endif /* BGP */
3831
3832 if (!config->cluster_iam_master)
3833 return 0;
3834
3835 if (main_quit == QUIT_SHUTDOWN)
3836 {
3837 static int dropped = 0;
3838 if (!dropped)
3839 {
3840 int i;
3841
3842 LOG(1, 0, 0, "Dropping sessions and tunnels\n");
3843 for (i = 1; i < MAXTUNNEL; i++)
3844 if (tunnel[i].ip || tunnel[i].state)
3845 tunnelshutdown(i, "L2TPNS Closing", 6, 0, 0);
3846
3847 dropped = 1;
3848 }
3849 }
3850
3851 if (start_busy_wait == 0)
3852 start_busy_wait = TIME;
3853
3854 for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
3855 {
3856 if (!tunnel[i].controlc)
3857 continue;
3858
3859 if (last_talked != TIME)
3860 {
3861 LOG(2, 0, 0, "Tunnel %u still has un-acked control messages.\n", i);
3862 last_talked = TIME;
3863 }
3864 return 1;
3865 }
3866
3867 // We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
3868 if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
3869 {
3870 LOG(1, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
3871 return 0;
3872 }
3873
3874 for (i = 1; i < MAXRADIUS; i++)
3875 {
3876 if (radius[i].state == RADIUSNULL)
3877 continue;
3878 if (radius[i].state == RADIUSWAIT)
3879 continue;
3880
3881 if (last_talked != TIME)
3882 {
3883 LOG(2, 0, 0, "Radius session %u is still busy (sid %u)\n", i, radius[i].session);
3884 last_talked = TIME;
3885 }
3886 return 1;
3887 }
3888
3889 return 0;
3890 }
3891
3892 #ifdef HAVE_EPOLL
3893 # include <sys/epoll.h>
3894 #else
3895 # define FAKE_EPOLL_IMPLEMENTATION /* include the functions */
3896 # include "fake_epoll.h"
3897 #endif
3898
3899 #ifdef LAC
3900 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink, udplac
3901 #define BASE_FDS 8
3902 #else
3903 // the base set of fds polled: cli, cluster, tun, udp, control, dae, netlink
3904 #define BASE_FDS 7
3905 #endif
3906
3907 // additional polled fds
3908 #ifdef BGP
3909 # define EXTRA_FDS BGP_NUM_PEERS
3910 #else
3911 # define EXTRA_FDS 0
3912 #endif
3913
3914 // main loop - gets packets on tun or udp and processes them
3915 static void mainloop(void)
3916 {
3917 int i;
3918 uint8_t buf[65536];
3919 uint8_t *p = buf + 8; // for the hearder of the forwarded MPPP packet (see C_MPPP_FORWARD)
3920 int size_bufp = sizeof(buf) - 8;
3921 clockt next_cluster_ping = 0; // send initial ping immediately
3922 struct epoll_event events[BASE_FDS + RADIUS_FDS + EXTRA_FDS];
3923 int maxevent = sizeof(events)/sizeof(*events);
3924
3925 if ((epollfd = epoll_create(maxevent)) < 0)
3926 {
3927 LOG(0, 0, 0, "epoll_create failed: %s\n", strerror(errno));
3928 exit(1);
3929 }
3930
3931 #ifdef LAC
3932 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d , udplacfd=%d\n",
3933 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd, udplacfd);
3934 #else
3935 LOG(4, 0, 0, "Beginning of main loop. clifd=%d, cluster_sockfd=%d, tunfd=%d, udpfd=%d, controlfd=%d, daefd=%d, nlfd=%d\n",
3936 clifd, cluster_sockfd, tunfd, udpfd, controlfd, daefd, nlfd);
3937 #endif
3938
3939 /* setup our fds to poll for input */
3940 {
3941 static struct event_data d[BASE_FDS];
3942 struct epoll_event e;
3943
3944 e.events = EPOLLIN;
3945 i = 0;
3946
3947 if (clifd >= 0)
3948 {
3949 d[i].type = FD_TYPE_CLI;
3950 e.data.ptr = &d[i++];
3951 epoll_ctl(epollfd, EPOLL_CTL_ADD, clifd, &e);
3952 }
3953
3954 d[i].type = FD_TYPE_CLUSTER;
3955 e.data.ptr = &d[i++];
3956 epoll_ctl(epollfd, EPOLL_CTL_ADD, cluster_sockfd, &e);
3957
3958 d[i].type = FD_TYPE_TUN;
3959 e.data.ptr = &d[i++];
3960 epoll_ctl(epollfd, EPOLL_CTL_ADD, tunfd, &e);
3961
3962 d[i].type = FD_TYPE_UDP;
3963 e.data.ptr = &d[i++];
3964 epoll_ctl(epollfd, EPOLL_CTL_ADD, udpfd, &e);
3965
3966 d[i].type = FD_TYPE_CONTROL;
3967 e.data.ptr = &d[i++];
3968 epoll_ctl(epollfd, EPOLL_CTL_ADD, controlfd, &e);
3969
3970 d[i].type = FD_TYPE_DAE;
3971 e.data.ptr = &d[i++];
3972 epoll_ctl(epollfd, EPOLL_CTL_ADD, daefd, &e);
3973
3974 d[i].type = FD_TYPE_NETLINK;
3975 e.data.ptr = &d[i++];
3976 epoll_ctl(epollfd, EPOLL_CTL_ADD, nlfd, &e);
3977
3978 #ifdef LAC
3979 d[i].type = FD_TYPE_UDPLAC;
3980 e.data.ptr = &d[i++];
3981 epoll_ctl(epollfd, EPOLL_CTL_ADD, udplacfd, &e);
3982 #endif
3983 }
3984
3985 #ifdef BGP
3986 signal(SIGPIPE, SIG_IGN);
3987 bgp_setup(config->as_number);
3988 if (config->bind_address)
3989 bgp_add_route(config->bind_address, 0xffffffff);
3990
3991 for (i = 0; i < BGP_NUM_PEERS; i++)
3992 {
3993 if (config->neighbour[i].name[0])
3994 bgp_start(&bgp_peers[i], config->neighbour[i].name,
3995 config->neighbour[i].as, config->neighbour[i].keepalive,
3996 config->neighbour[i].hold, config->neighbour[i].update_source,
3997 0); /* 0 = routing disabled */
3998 }
3999 #endif /* BGP */
4000
4001 while (!main_quit || still_busy())
4002 {
4003 int more = 0;
4004 int n;
4005
4006
4007 if (main_reload)
4008 {
4009 main_reload = 0;
4010 read_config_file();
4011 config->reload_config++;
4012 }
4013
4014 if (config->reload_config)
4015 {
4016 config->reload_config = 0;
4017 update_config();
4018 }
4019
4020 #ifdef BGP
4021 bgp_set_poll();
4022 #endif /* BGP */
4023
4024 n = epoll_wait(epollfd, events, maxevent, 100); // timeout 100ms (1/10th sec)
4025 STAT(select_called);
4026
4027 TIME = now(NULL);
4028 if (n < 0)
4029 {
4030 if (errno == EINTR ||
4031 errno == ECHILD) // EINTR was clobbered by sigchild_handler()
4032 continue;
4033
4034 LOG(0, 0, 0, "Error returned from select(): %s\n", strerror(errno));
4035 break; // exit
4036 }
4037
4038 if (n)
4039 {
4040 struct sockaddr_in addr;
4041 struct in_addr local;
4042 socklen_t alen;
4043 int c, s;
4044 int udp_ready = 0;
4045 #ifdef LAC
4046 int udplac_ready = 0;
4047 int udplac_pkts = 0;
4048 #endif
4049 int tun_ready = 0;
4050 int cluster_ready = 0;
4051 int udp_pkts = 0;
4052 int tun_pkts = 0;
4053 int cluster_pkts = 0;
4054 #ifdef BGP
4055 uint32_t bgp_events[BGP_NUM_PEERS];
4056 memset(bgp_events, 0, sizeof(bgp_events));
4057 #endif /* BGP */
4058
4059 for (c = n, i = 0; i < c; i++)
4060 {
4061 struct event_data *d = events[i].data.ptr;
4062
4063 switch (d->type)
4064 {
4065 case FD_TYPE_CLI: // CLI connections
4066 {
4067 int cli;
4068
4069 alen = sizeof(addr);
4070 if ((cli = accept(clifd, (struct sockaddr *)&addr, &alen)) >= 0)
4071 {
4072 cli_do(cli);
4073 close(cli);
4074 }
4075 else
4076 LOG(0, 0, 0, "accept error: %s\n", strerror(errno));
4077
4078 n--;
4079 break;
4080 }
4081
4082 // these are handled below, with multiple interleaved reads
4083 case FD_TYPE_CLUSTER: cluster_ready++; break;
4084 case FD_TYPE_TUN: tun_ready++; break;
4085 case FD_TYPE_UDP: udp_ready++; break;
4086 #ifdef LAC
4087 case FD_TYPE_UDPLAC: udplac_ready++; break;
4088 #endif
4089 case FD_TYPE_CONTROL: // nsctl commands
4090 alen = sizeof(addr);
4091 s = recvfromto(controlfd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4092 if (s > 0) processcontrol(buf, s, &addr, alen, &local);
4093 n--;
4094 break;
4095
4096 case FD_TYPE_DAE: // DAE requests
4097 alen = sizeof(addr);
4098 s = recvfromto(daefd, buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen, &local);
4099 if (s > 0) processdae(buf, s, &addr, alen, &local);
4100 n--;
4101 break;
4102
4103 case FD_TYPE_RADIUS: // RADIUS response
4104 alen = sizeof(addr);
4105 s = recvfrom(radfds[d->index], buf, sizeof(buf), MSG_WAITALL, (struct sockaddr *) &addr, &alen);
4106 if (s >= 0 && config->cluster_iam_master)
4107 {
4108 if (addr.sin_addr.s_addr == config->radiusserver[0] ||
4109 addr.sin_addr.s_addr == config->radiusserver[1])
4110 processrad(buf, s, d->index);
4111 else
4112 LOG(3, 0, 0, "Dropping RADIUS packet from unknown source %s\n",
4113 fmtaddr(addr.sin_addr.s_addr, 0));
4114 }
4115
4116 n--;
4117 break;
4118
4119 #ifdef BGP
4120 case FD_TYPE_BGP:
4121 bgp_events[d->index] = events[i].events;
4122 n--;
4123 break;
4124 #endif /* BGP */
4125
4126 case FD_TYPE_NETLINK:
4127 {
4128 struct nlmsghdr *nh = (struct nlmsghdr *)buf;
4129 s = netlink_recv(buf, sizeof(buf));
4130 if (nh->nlmsg_type == NLMSG_ERROR)
4131 {
4132 struct nlmsgerr *errmsg = NLMSG_DATA(nh);
4133 if (errmsg->error)
4134 {
4135 if (errmsg->msg.nlmsg_seq < min_initok_nlseqnum)
4136 {
4137 LOG(0, 0, 0, "Got a fatal netlink error (while %s): %s\n", tun_nl_phase_msg[nh->nlmsg_seq], strerror(-errmsg->error));
4138 exit(1);
4139 }
4140 else
4141
4142 LOG(0, 0, 0, "Got a netlink error: %s\n", strerror(-errmsg->error));
4143 }
4144 // else it's a ack
4145 }
4146 else
4147 LOG(1, 0, 0, "Got a unknown netlink message: type %d seq %d flags %d\n", nh->nlmsg_type, nh->nlmsg_seq, nh->nlmsg_flags);
4148 n--;
4149 break;
4150 }
4151
4152 default:
4153 LOG(0, 0, 0, "Unexpected fd type returned from epoll_wait: %d\n", d->type);
4154 }
4155 }
4156
4157 #ifdef BGP
4158 bgp_process(bgp_events);
4159 #endif /* BGP */
4160
4161 for (c = 0; n && c < config->multi_read_count; c++)
4162 {
4163 // L2TP
4164 if (udp_ready)
4165 {
4166 alen = sizeof(addr);
4167 if ((s = recvfrom(udpfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
4168 {
4169 processudp(buf, s, &addr);
4170 udp_pkts++;
4171 }
4172 else
4173 {
4174 udp_ready = 0;
4175 n--;
4176 }
4177 }
4178 #ifdef LAC
4179 // L2TP REMOTE LNS
4180 if (udplac_ready)
4181 {
4182 alen = sizeof(addr);
4183 if ((s = recvfrom(udplacfd, buf, sizeof(buf), 0, (void *) &addr, &alen)) > 0)
4184 {
4185 if (!config->disable_lac_func)
4186 processudp(buf, s, &addr);
4187
4188 udplac_pkts++;
4189 }
4190 else
4191 {
4192 udplac_ready = 0;
4193 n--;
4194 }
4195 }
4196 #endif
4197 // incoming IP
4198 if (tun_ready)
4199 {
4200 if ((s = read(tunfd, p, size_bufp)) > 0)
4201 {
4202 processtun(p, s);
4203 tun_pkts++;
4204 }
4205 else
4206 {
4207 tun_ready = 0;
4208 n--;
4209 }
4210 }
4211
4212 // cluster
4213 if (cluster_ready)
4214 {
4215 alen = sizeof(addr);
4216 if ((s = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen)) > 0)
4217 {
4218 processcluster(buf, s, addr.sin_addr.s_addr);
4219 cluster_pkts++;
4220 }
4221 else
4222 {
4223 cluster_ready = 0;
4224 n--;
4225 }
4226 }
4227 }
4228
4229 if (udp_pkts > 1 || tun_pkts > 1 || cluster_pkts > 1)
4230 STAT(multi_read_used);
4231
4232 if (c >= config->multi_read_count)
4233 {
4234 #ifdef LAC
4235 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun %d cluster and %d rmlns packets\n",
4236 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts, udplac_pkts);
4237 #else
4238 LOG(3, 0, 0, "Reached multi_read_count (%d); processed %d udp, %d tun and %d cluster packets\n",
4239 config->multi_read_count, udp_pkts, tun_pkts, cluster_pkts);
4240 #endif
4241 STAT(multi_read_exceeded);
4242 more++;
4243 }
4244 }
4245 #ifdef BGP
4246 else
4247 /* no event received, but timers could still have expired */
4248 bgp_process_peers_timers();
4249 #endif /* BGP */
4250
4251 if (time_changed)
4252 {
4253 double Mbps = 1024.0 * 1024.0 / 8 * time_changed;
4254
4255 // Log current traffic stats
4256 snprintf(config->bandwidth, sizeof(config->bandwidth),
4257 "UDP-ETH:%1.0f/%1.0f ETH-UDP:%1.0f/%1.0f TOTAL:%0.1f IN:%u OUT:%u",
4258 (udp_rx / Mbps), (eth_tx / Mbps), (eth_rx / Mbps), (udp_tx / Mbps),
4259 ((udp_tx + udp_rx + eth_tx + eth_rx) / Mbps),
4260 udp_rx_pkt / time_changed, eth_rx_pkt / time_changed);
4261
4262 udp_tx = udp_rx = 0;
4263 udp_rx_pkt = eth_rx_pkt = 0;
4264 eth_tx = eth_rx = 0;
4265 time_changed = 0;
4266
4267 if (config->dump_speed)
4268 printf("%s\n", config->bandwidth);
4269
4270 // Update the internal time counter
4271 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4272
4273 {
4274 // Run timer hooks
4275 struct param_timer p = { time_now };
4276 run_plugins(PLUGIN_TIMER, &p);
4277 }
4278 }
4279
4280 // Runs on every machine (master and slaves).
4281 if (next_cluster_ping <= TIME)
4282 {
4283 // Check to see which of the cluster is still alive..
4284
4285 cluster_send_ping(basetime); // Only does anything if we're a slave
4286 cluster_check_master(); // ditto.
4287
4288 cluster_heartbeat(); // Only does anything if we're a master.
4289 cluster_check_slaves(); // ditto.
4290
4291 master_update_counts(); // If we're a slave, send our byte counters to our master.
4292
4293 if (config->cluster_iam_master && !config->cluster_iam_uptodate)
4294 next_cluster_ping = TIME + 1; // out-of-date slaves, do fast updates
4295 else
4296 next_cluster_ping = TIME + config->cluster_hb_interval;
4297 }
4298
4299 if (!config->cluster_iam_master)
4300 continue;
4301
4302 // Run token bucket filtering queue..
4303 // Only run it every 1/10th of a second.
4304 {
4305 static clockt last_run = 0;
4306 if (last_run != TIME)
4307 {
4308 last_run = TIME;
4309 tbf_run_timer();
4310 }
4311 }
4312
4313 // Handle timeouts, retries etc.
4314 {
4315 static double last_clean = 0;
4316 double this_clean;
4317 double diff;
4318
4319 TIME = now(&this_clean);
4320 diff = this_clean - last_clean;
4321
4322 // Run during idle time (after we've handled
4323 // all incoming packets) or every 1/10th sec
4324 if (!more || diff > 0.1)
4325 {
4326 regular_cleanups(diff);
4327 last_clean = this_clean;
4328 }
4329 }
4330
4331 if (*config->accounting_dir)
4332 {
4333 static clockt next_acct = 0;
4334 static clockt next_shut_acct = 0;
4335
4336 if (next_acct <= TIME)
4337 {
4338 // Dump accounting data
4339 next_acct = TIME + ACCT_TIME;
4340 next_shut_acct = TIME + ACCT_SHUT_TIME;
4341 dump_acct_info(1);
4342 }
4343 else if (next_shut_acct <= TIME)
4344 {
4345 // Dump accounting data for shutdown sessions
4346 next_shut_acct = TIME + ACCT_SHUT_TIME;
4347 if (shut_acct_n)
4348 dump_acct_info(0);
4349 }
4350 }
4351 }
4352
4353 // Are we the master and shutting down??
4354 if (config->cluster_iam_master)
4355 cluster_heartbeat(); // Flush any queued changes..
4356
4357 // Ok. Notify everyone we're shutting down. If we're
4358 // the master, this will force an election.
4359 cluster_send_ping(0);
4360
4361 //
4362 // Important!!! We MUST not process any packets past this point!
4363 LOG(1, 0, 0, "Shutdown complete\n");
4364 }
4365
4366 static void stripdomain(char *host)
4367 {
4368 char *p;
4369
4370 if ((p = strchr(host, '.')))
4371 {
4372 char *domain = 0;
4373 char _domain[1024];
4374
4375 // strip off domain
4376 FILE *resolv = fopen("/etc/resolv.conf", "r");
4377 if (resolv)
4378 {
4379 char buf[1024];
4380 char *b;
4381
4382 while (fgets(buf, sizeof(buf), resolv))
4383 {
4384 if (strncmp(buf, "domain", 6) && strncmp(buf, "search", 6))
4385 continue;
4386
4387 if (!isspace(buf[6]))
4388 continue;
4389
4390 b = buf + 7;
4391 while (isspace(*b)) b++;
4392
4393 if (*b)
4394 {
4395 char *d = b;
4396 while (*b && !isspace(*b)) b++;
4397 *b = 0;
4398 if (buf[0] == 'd') // domain is canonical
4399 {
4400 domain = d;
4401 break;
4402 }
4403
4404 // first search line
4405 if (!domain)
4406 {
4407 // hold, may be subsequent domain line
4408 strncpy(_domain, d, sizeof(_domain))[sizeof(_domain)-1] = 0;
4409 domain = _domain;
4410 }
4411 }
4412 }
4413
4414 fclose(resolv);
4415 }
4416
4417 if (domain)
4418 {
4419 int hl = strlen(host);
4420 int dl = strlen(domain);
4421 if (dl < hl && host[hl - dl - 1] == '.' && !strcmp(host + hl - dl, domain))
4422 host[hl -dl - 1] = 0;
4423 }
4424 else
4425 {
4426 *p = 0; // everything after first dot
4427 }
4428 }
4429 }
4430
4431 // Init data structures
4432 static void initdata(int optdebug, char *optconfig)
4433 {
4434 int i;
4435
4436 if (!(config = shared_malloc(sizeof(configt))))
4437 {
4438 fprintf(stderr, "Error doing malloc for configuration: %s\n", strerror(errno));
4439 exit(1);
4440 }
4441
4442 memset(config, 0, sizeof(configt));
4443 time(&config->start_time);
4444 strncpy(config->config_file, optconfig, strlen(optconfig));
4445 config->debug = optdebug;
4446 config->num_tbfs = MAXTBFS;
4447 config->rl_rate = 28; // 28kbps
4448 config->cluster_mcast_ttl = 1;
4449 config->cluster_master_min_adv = 1;
4450 config->ppp_restart_time = 3;
4451 config->ppp_max_configure = 10;
4452 config->ppp_max_failure = 5;
4453 config->kill_timedout_sessions = 1;
4454 strcpy(config->random_device, RANDOMDEVICE);
4455 // Set default value echo_timeout and idle_echo_timeout
4456 config->echo_timeout = ECHO_TIMEOUT;
4457 config->idle_echo_timeout = IDLE_ECHO_TIMEOUT;
4458
4459 log_stream = stderr;
4460
4461 #ifdef RINGBUFFER
4462 if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
4463 {
4464 LOG(0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
4465 exit(1);
4466 }
4467 memset(ringbuffer, 0, sizeof(struct Tringbuffer));
4468 #endif
4469
4470 if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
4471 {
4472 LOG(0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
4473 exit(1);
4474 }
4475 if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
4476 {
4477 LOG(0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
4478 exit(1);
4479 }
4480 if (!(bundle = shared_malloc(sizeof(bundlet) * MAXBUNDLE)))
4481 {
4482 LOG(0, 0, 0, "Error doing malloc for bundles: %s\n", strerror(errno));
4483 exit(1);
4484 }
4485 if (!(frag = shared_malloc(sizeof(fragmentationt) * MAXBUNDLE)))
4486 {
4487 LOG(0, 0, 0, "Error doing malloc for fragmentations: %s\n", strerror(errno));
4488 exit(1);
4489 }
4490 if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
4491 {
4492 LOG(0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
4493 exit(1);
4494 }
4495
4496 if (!(sess_local = shared_malloc(sizeof(sessionlocalt) * MAXSESSION)))
4497 {
4498 LOG(0, 0, 0, "Error doing malloc for sess_local: %s\n", strerror(errno));
4499 exit(1);
4500 }
4501
4502 if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
4503 {
4504 LOG(0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
4505 exit(1);
4506 }
4507
4508 if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
4509 {
4510 LOG(0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
4511 exit(1);
4512 }
4513
4514 if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
4515 {
4516 LOG(0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
4517 exit(1);
4518 }
4519 memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
4520
4521 if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
4522 {
4523 LOG(0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
4524 exit(1);
4525 }
4526 memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
4527
4528 if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
4529 {
4530 LOG(0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
4531 exit(1);
4532 }
4533 memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
4534
4535 memset(tunnel, 0, sizeof(tunnelt) * MAXTUNNEL);
4536 memset(bundle, 0, sizeof(bundlet) * MAXBUNDLE);
4537 memset(session, 0, sizeof(sessiont) * MAXSESSION);
4538 memset(radius, 0, sizeof(radiust) * MAXRADIUS);
4539 memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
4540
4541 // Put all the sessions on the free list marked as undefined.
4542 for (i = 1; i < MAXSESSION; i++)
4543 {
4544 session[i].next = i + 1;
4545 session[i].tunnel = T_UNDEF; // mark it as not filled in.
4546 }
4547 session[MAXSESSION - 1].next = 0;
4548 sessionfree = 1;
4549
4550 // Mark all the tunnels as undefined (waiting to be filled in by a download).
4551 for (i = 1; i < MAXTUNNEL; i++)
4552 tunnel[i].state = TUNNELUNDEF; // mark it as not filled in.
4553
4554 for (i = 1; i < MAXBUNDLE; i++) {
4555 bundle[i].state = BUNDLEUNDEF;
4556 }
4557
4558 if (!*hostname)
4559 {
4560 // Grab my hostname unless it's been specified
4561 gethostname(hostname, sizeof(hostname));
4562 stripdomain(hostname);
4563 }
4564
4565 _statistics->start_time = _statistics->last_reset = time(NULL);
4566
4567 #ifdef BGP
4568 if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
4569 {
4570 LOG(0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
4571 exit(1);
4572 }
4573 #endif /* BGP */
4574
4575 #ifdef LAC
4576 lac_initremotelnsdata();
4577 #endif
4578 }
4579
4580 static int assign_ip_address(sessionidt s)
4581 {
4582 uint32_t i;
4583 int best = -1;
4584 time_t best_time = time_now;
4585 char *u = session[s].user;
4586 char reuse = 0;
4587
4588
4589 CSTAT(assign_ip_address);
4590
4591 for (i = 1; i < ip_pool_size; i++)
4592 {
4593 if (!ip_address_pool[i].address || ip_address_pool[i].assigned)
4594 continue;
4595
4596 if (!session[s].walled_garden && ip_address_pool[i].user[0] && !strcmp(u, ip_address_pool[i].user))
4597 {
4598 best = i;
4599 reuse = 1;
4600 break;
4601 }
4602
4603 if (ip_address_pool[i].last < best_time)
4604 {
4605 best = i;
4606 if (!(best_time = ip_address_pool[i].last))
4607 break; // never used, grab this one
4608 }
4609 }
4610
4611 if (best < 0)
4612 {
4613 LOG(0, s, session[s].tunnel, "assign_ip_address(): out of addresses\n");
4614 return 0;
4615 }
4616
4617 session[s].ip = ip_address_pool[best].address;
4618 session[s].ip_pool_index = best;
4619 ip_address_pool[best].assigned = 1;
4620 ip_address_pool[best].last = time_now;
4621 ip_address_pool[best].session = s;
4622 if (session[s].walled_garden)
4623 /* Don't track addresses of users in walled garden (note: this
4624 means that their address isn't "sticky" even if they get
4625 un-gardened). */
4626 ip_address_pool[best].user[0] = 0;
4627 else
4628 strncpy(ip_address_pool[best].user, u, sizeof(ip_address_pool[best].user) - 1);
4629
4630 STAT(ip_allocated);
4631 LOG(4, s, session[s].tunnel, "assign_ip_address(): %s ip address %d from pool\n",
4632 reuse ? "Reusing" : "Allocating", best);
4633
4634 return 1;
4635 }
4636
4637 static void free_ip_address(sessionidt s)
4638 {
4639 int i = session[s].ip_pool_index;
4640
4641
4642 CSTAT(free_ip_address);
4643
4644 if (!session[s].ip)
4645 return; // what the?
4646
4647 if (i < 0) // Is this actually part of the ip pool?
4648 i = 0;
4649
4650 STAT(ip_freed);
4651 cache_ipmap(session[s].ip, -i); // Change the mapping to point back to the ip pool index.
4652 session[s].ip = 0;
4653 ip_address_pool[i].assigned = 0;
4654 ip_address_pool[i].session = 0;
4655 ip_address_pool[i].last = time_now;
4656 }
4657
4658 //
4659 // Fsck the address pool against the session table.
4660 // Normally only called when we become a master.
4661 //
4662 // This isn't perfect: We aren't keep tracking of which
4663 // users used to have an IP address.
4664 //
4665 void rebuild_address_pool(void)
4666 {
4667 int i;
4668
4669 //
4670 // Zero the IP pool allocation, and build
4671 // a map from IP address to pool index.
4672 for (i = 1; i < MAXIPPOOL; ++i)
4673 {
4674 ip_address_pool[i].assigned = 0;
4675 ip_address_pool[i].session = 0;
4676 if (!ip_address_pool[i].address)
4677 continue;
4678
4679 cache_ipmap(ip_address_pool[i].address, -i); // Map pool IP to pool index.
4680 }
4681
4682 for (i = 0; i < MAXSESSION; ++i)
4683 {
4684 int ipid;
4685 if (!(session[i].opened && session[i].ip))
4686 continue;
4687
4688 ipid = - lookup_ipmap(htonl(session[i].ip));
4689
4690 if (session[i].ip_pool_index < 0)
4691 {
4692 // Not allocated out of the pool.
4693 if (ipid < 1) // Not found in the pool either? good.
4694 continue;
4695
4696 LOG(0, i, 0, "Session %u has an IP address (%s) that was marked static, but is in the pool (%d)!\n",
4697 i, fmtaddr(session[i].ip, 0), ipid);
4698
4699 // Fall through and process it as part of the pool.
4700 }
4701
4702
4703 if (ipid > MAXIPPOOL || ipid < 0)
4704 {
4705 LOG(0, i, 0, "Session %u has a pool IP that's not found in the pool! (%d)\n", i, ipid);
4706 ipid = -1;
4707 session[i].ip_pool_index = ipid;
4708 continue;
4709 }
4710
4711 ip_address_pool[ipid].assigned = 1;
4712 ip_address_pool[ipid].session = i;
4713 ip_address_pool[ipid].last = time_now;
4714 strncpy(ip_address_pool[ipid].user, session[i].user, sizeof(ip_address_pool[ipid].user) - 1);
4715 session[i].ip_pool_index = ipid;
4716 cache_ipmap(session[i].ip, i); // Fix the ip map.
4717 }
4718 }
4719
4720 //
4721 // Fix the address pool to match a changed session.
4722 // (usually when the master sends us an update).
4723 static void fix_address_pool(int sid)
4724 {
4725 int ipid;
4726
4727 ipid = session[sid].ip_pool_index;
4728
4729 if (ipid > ip_pool_size)
4730 return; // Ignore it. rebuild_address_pool will fix it up.
4731
4732 if (ip_address_pool[ipid].address != session[sid].ip)
4733 return; // Just ignore it. rebuild_address_pool will take care of it.
4734
4735 ip_address_pool[ipid].assigned = 1;
4736 ip_address_pool[ipid].session = sid;
4737 ip_address_pool[ipid].last = time_now;
4738 strncpy(ip_address_pool[ipid].user, session[sid].user, sizeof(ip_address_pool[ipid].user) - 1);
4739 }
4740
4741 //
4742 // Add a block of addresses to the IP pool to hand out.
4743 //
4744 static void add_to_ip_pool(in_addr_t addr, int prefixlen)
4745 {
4746 int i;
4747 if (prefixlen == 0)
4748 prefixlen = 32; // Host route only.
4749
4750 addr &= 0xffffffff << (32 - prefixlen);
4751
4752 if (ip_pool_size >= MAXIPPOOL) // Pool is full!
4753 return ;
4754
4755 for (i = addr ; i < addr+(1<<(32-prefixlen)); ++i)
4756 {
4757 if ((i & 0xff) == 0 || (i&0xff) == 255)
4758 continue; // Skip 0 and broadcast addresses.
4759
4760 ip_address_pool[ip_pool_size].address = i;
4761 ip_address_pool[ip_pool_size].assigned = 0;
4762 ++ip_pool_size;
4763 if (ip_pool_size >= MAXIPPOOL)
4764 {
4765 LOG(0, 0, 0, "Overflowed IP pool adding %s\n", fmtaddr(htonl(addr), 0));
4766 return;
4767 }
4768 }
4769 }
4770
4771 // Initialize the IP address pool
4772 static void initippool()
4773 {
4774 FILE *f;
4775 char *p;
4776 char buf[4096];
4777 memset(ip_address_pool, 0, sizeof(ip_address_pool));
4778
4779 if (!(f = fopen(IPPOOLFILE, "r")))
4780 {
4781 LOG(0, 0, 0, "Can't load pool file " IPPOOLFILE ": %s\n", strerror(errno));
4782 exit(1);
4783 }
4784
4785 while (ip_pool_size < MAXIPPOOL && fgets(buf, 4096, f))
4786 {
4787 char *pool = buf;
4788 buf[4095] = 0; // Force it to be zero terminated/
4789
4790 if (*buf == '#' || *buf == '\n')
4791 continue; // Skip comments / blank lines
4792 if ((p = (char *)strrchr(buf, '\n'))) *p = 0;
4793 if ((p = (char *)strchr(buf, ':')))
4794 {
4795 in_addr_t src;
4796 *p = '\0';
4797 src = inet_addr(buf);
4798 if (src == INADDR_NONE)
4799 {
4800 LOG(0, 0, 0, "Invalid address pool IP %s\n", buf);
4801 exit(1);
4802 }
4803 // This entry is for a specific IP only
4804 if (src != config->bind_address)
4805 continue;
4806 *p = ':';
4807 pool = p+1;
4808 }
4809 if ((p = (char *)strchr(pool, '/')))
4810 {
4811 // It's a range
4812 int numbits = 0;
4813 in_addr_t start = 0;
4814
4815 LOG(2, 0, 0, "Adding IP address range %s\n", buf);
4816 *p++ = 0;
4817 if (!*p || !(numbits = atoi(p)))
4818 {
4819 LOG(0, 0, 0, "Invalid pool range %s\n", buf);
4820 continue;
4821 }
4822 start = ntohl(inet_addr(pool));
4823
4824 // Add a static route for this pool
4825 LOG(5, 0, 0, "Adding route for address pool %s/%d\n",
4826 fmtaddr(htonl(start), 0), numbits);
4827
4828 routeset(0, start, numbits, 0, 1);
4829
4830 add_to_ip_pool(start, numbits);
4831 }
4832 else
4833 {
4834 // It's a single ip address
4835 add_to_ip_pool(ntohl(inet_addr(pool)), 0);
4836 }
4837 }
4838 fclose(f);
4839 LOG(1, 0, 0, "IP address pool is %d addresses\n", ip_pool_size - 1);
4840 }
4841
4842 void snoop_send_packet(uint8_t *packet, uint16_t size, in_addr_t destination, uint16_t port)
4843 {
4844 struct sockaddr_in snoop_addr = {0};
4845 if (!destination || !port || snoopfd <= 0 || size <= 0 || !packet)
4846 return;
4847
4848 snoop_addr.sin_family = AF_INET;
4849 snoop_addr.sin_addr.s_addr = destination;
4850 snoop_addr.sin_port = ntohs(port);
4851
4852 LOG(5, 0, 0, "Snooping %d byte packet to %s:%u\n", size,
4853 fmtaddr(snoop_addr.sin_addr.s_addr, 0),
4854 htons(snoop_addr.sin_port));
4855
4856 if (sendto(snoopfd, packet, size, MSG_DONTWAIT | MSG_NOSIGNAL, (void *) &snoop_addr, sizeof(snoop_addr)) < 0)
4857 LOG(0, 0, 0, "Error sending intercept packet: %s\n", strerror(errno));
4858
4859 STAT(packets_snooped);
4860 }
4861
4862 static int dump_session(FILE **f, sessiont *s)
4863 {
4864 #ifdef LAC
4865 if (!s->opened || (!s->ip && !s->forwardtosession) || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4866 #else
4867 if (!s->opened || !s->ip || !(s->cin_delta || s->cout_delta) || !*s->user || s->walled_garden)
4868 #endif
4869 return 1;
4870
4871 if (!*f)
4872 {
4873 char filename[1024];
4874 char timestr[64];
4875 time_t now = time(NULL);
4876
4877 strftime(timestr, sizeof(timestr), "%Y%m%d%H%M%S", localtime(&now));
4878 snprintf(filename, sizeof(filename), "%s/%s", config->accounting_dir, timestr);
4879
4880 if (!(*f = fopen(filename, "w")))
4881 {
4882 LOG(0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
4883 return 0;
4884 }
4885
4886 LOG(3, 0, 0, "Dumping accounting information to %s\n", filename);
4887 fprintf(*f, "# dslwatch.pl dump file V1.01\n"
4888 "# host: %s\n"
4889 "# endpoint: %s\n"
4890 "# time: %ld\n"
4891 "# uptime: %ld\n"
4892 "# format: username ip qos uptxoctets downrxoctets\n",
4893 hostname,
4894 fmtaddr(config->iftun_address ? config->iftun_address : my_address, 0),
4895 now,
4896 now - basetime);
4897 }
4898
4899 LOG(4, 0, 0, "Dumping accounting information for %s\n", s->user);
4900 fprintf(*f, "%s %s %d %u %u\n",
4901 s->user, // username
4902 fmtaddr(htonl(s->ip), 0), // ip
4903 (s->throttle_in || s->throttle_out) ? 2 : 1, // qos
4904 (uint32_t) s->cin_delta, // uptxoctets
4905 (uint32_t) s->cout_delta); // downrxoctets
4906
4907 s->cin_delta = s->cout_delta = 0;
4908
4909 return 1;
4910 }
4911
4912 static void dump_acct_info(int all)
4913 {
4914 int i;
4915 FILE *f = NULL;
4916
4917
4918 CSTAT(dump_acct_info);
4919
4920 if (shut_acct_n)
4921 {
4922 for (i = 0; i < shut_acct_n; i++)
4923 dump_session(&f, &shut_acct[i]);
4924
4925 shut_acct_n = 0;
4926 }
4927
4928 if (all)
4929 for (i = 1; i <= config->cluster_highest_sessionid; i++)
4930 dump_session(&f, &session[i]);
4931
4932 if (f)
4933 fclose(f);
4934 }
4935
4936 // Main program
4937 int main(int argc, char *argv[])
4938 {
4939 int i;
4940 int optdebug = 0;
4941 char *optconfig = CONFIGFILE;
4942
4943 time(&basetime); // start clock
4944
4945 // scan args
4946 while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
4947 {
4948 switch (i)
4949 {
4950 case 'd':
4951 if (fork()) exit(0);
4952 setsid();
4953 freopen("/dev/null", "r", stdin);
4954 freopen("/dev/null", "w", stdout);
4955 freopen("/dev/null", "w", stderr);
4956 break;
4957 case 'v':
4958 optdebug++;
4959 break;
4960 case 'c':
4961 optconfig = optarg;
4962 break;
4963 case 'h':
4964 snprintf(hostname, sizeof(hostname), "%s", optarg);
4965 break;
4966 default:
4967 printf("Args are:\n"
4968 "\t-d\t\tDetach from terminal\n"
4969 "\t-c <file>\tConfig file\n"
4970 "\t-h <hostname>\tForce hostname\n"
4971 "\t-v\t\tDebug\n");
4972
4973 return (0);
4974 break;
4975 }
4976 }
4977
4978 // Start the timer routine off
4979 time(&time_now);
4980 strftime(time_now_string, sizeof(time_now_string), "%Y-%m-%d %H:%M:%S", localtime(&time_now));
4981
4982 initplugins();
4983 initdata(optdebug, optconfig);
4984
4985 init_cli();
4986 read_config_file();
4987 /* set hostname /after/ having read the config file */
4988 if (*config->hostname)
4989 strcpy(hostname, config->hostname);
4990 cli_init_complete(hostname);
4991 update_config();
4992 init_tbf(config->num_tbfs);
4993
4994 LOG(0, 0, 0, "L2TPNS version " VERSION "\n");
4995 LOG(0, 0, 0, "Copyright (c) 2003, 2004, 2005, 2006 Optus Internet Engineering\n");
4996 LOG(0, 0, 0, "Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced\n");
4997 {
4998 struct rlimit rlim;
4999 rlim.rlim_cur = RLIM_INFINITY;
5000 rlim.rlim_max = RLIM_INFINITY;
5001 // Remove the maximum core size
5002 if (setrlimit(RLIMIT_CORE, &rlim) < 0)
5003 LOG(0, 0, 0, "Can't set ulimit: %s\n", strerror(errno));
5004
5005 // Make core dumps go to /tmp
5006 chdir("/tmp");
5007 }
5008
5009 if (config->scheduler_fifo)
5010 {
5011 int ret;
5012 struct sched_param params = {0};
5013 params.sched_priority = 1;
5014
5015 if (get_nprocs() < 2)
5016 {
5017 LOG(0, 0, 0, "Not using FIFO scheduler, there is only 1 processor in the system.\n");
5018 config->scheduler_fifo = 0;
5019 }
5020 else
5021 {
5022 if ((ret = sched_setscheduler(0, SCHED_FIFO, &params)) == 0)
5023 {
5024 LOG(1, 0, 0, "Using FIFO scheduler. Say goodbye to any other processes running\n");
5025 }
5026 else
5027 {
5028 LOG(0, 0, 0, "Error setting scheduler to FIFO: %s\n", strerror(errno));
5029 config->scheduler_fifo = 0;
5030 }
5031 }
5032 }
5033
5034 initnetlink();
5035
5036 /* Set up the cluster communications port. */
5037 if (cluster_init() < 0)
5038 exit(1);
5039
5040 inittun();
5041 LOG(1, 0, 0, "Set up on interface %s\n", config->tundevice);
5042
5043 initudp();
5044 initrad();
5045 initippool();
5046
5047 // seed prng
5048 {
5049 unsigned seed = time_now ^ getpid();
5050 LOG(4, 0, 0, "Seeding the pseudo random generator: %u\n", seed);
5051 srand(seed);
5052 }
5053
5054 signal(SIGHUP, sighup_handler);
5055 signal(SIGCHLD, sigchild_handler);
5056 signal(SIGTERM, shutdown_handler);
5057 signal(SIGINT, shutdown_handler);
5058 signal(SIGQUIT, shutdown_handler);
5059
5060 // Prevent us from getting paged out
5061 if (config->lock_pages)
5062 {
5063 if (!mlockall(MCL_CURRENT))
5064 LOG(1, 0, 0, "Locking pages into memory\n");
5065 else
5066 LOG(0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
5067 }
5068
5069 mainloop();
5070
5071 /* remove plugins (so cleanup code gets run) */
5072 plugins_done();
5073
5074 // Remove the PID file if we wrote it
5075 if (config->wrote_pid && *config->pid_file == '/')
5076 unlink(config->pid_file);
5077
5078 /* kill CLI children */
5079 signal(SIGTERM, SIG_IGN);
5080 kill(0, SIGTERM);
5081 return 0;
5082 }
5083
5084 static void sighup_handler(int sig)
5085 {
5086 main_reload++;
5087 }
5088
5089 static void shutdown_handler(int sig)
5090 {
5091 main_quit = (sig == SIGQUIT) ? QUIT_SHUTDOWN : QUIT_FAILOVER;
5092 }
5093
5094 static void sigchild_handler(int sig)
5095 {
5096 while (waitpid(-1, NULL, WNOHANG) > 0)
5097 ;
5098 }
5099
5100 static void build_chap_response(uint8_t *challenge, uint8_t id, uint16_t challenge_length, uint8_t **challenge_response)
5101 {
5102 MD5_CTX ctx;
5103 *challenge_response = NULL;
5104
5105 if (!*config->l2tp_secret)
5106 {
5107 LOG(0, 0, 0, "LNS requested CHAP authentication, but no l2tp secret is defined\n");
5108 return;
5109 }
5110
5111 LOG(4, 0, 0, " Building challenge response for CHAP request\n");
5112
5113 *challenge_response = calloc(17, 1);
5114
5115 MD5_Init(&ctx);
5116 MD5_Update(&ctx, &id, 1);
5117 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
5118 MD5_Update(&ctx, challenge, challenge_length);
5119 MD5_Final(*challenge_response, &ctx);
5120
5121 return;
5122 }
5123
5124 static int facility_value(char *name)
5125 {
5126 int i;
5127 for (i = 0; facilitynames[i].c_name; i++)
5128 {
5129 if (strcmp(facilitynames[i].c_name, name) == 0)
5130 return facilitynames[i].c_val;
5131 }
5132 return 0;
5133 }
5134
5135 static void update_config()
5136 {
5137 int i;
5138 char *p;
5139 static int timeout = 0;
5140 static int interval = 0;
5141
5142 // Update logging
5143 closelog();
5144 syslog_log = 0;
5145 if (log_stream)
5146 {
5147 if (log_stream != stderr)
5148 fclose(log_stream);
5149
5150 log_stream = NULL;
5151 }
5152
5153 if (*config->log_filename)
5154 {
5155 if (strstr(config->log_filename, "syslog:") == config->log_filename)
5156 {
5157 char *p = config->log_filename + 7;
5158 if (*p)
5159 {
5160 openlog("l2tpns", LOG_PID, facility_value(p));
5161 syslog_log = 1;
5162 }
5163 }
5164 else if (strchr(config->log_filename, '/') == config->log_filename)
5165 {
5166 if ((log_stream = fopen((char *)(config->log_filename), "a")))
5167 {
5168 fseek(log_stream, 0, SEEK_END);
5169 setbuf(log_stream, NULL);
5170 }
5171 else
5172 {
5173 log_stream = stderr;
5174 setbuf(log_stream, NULL);
5175 }
5176 }
5177 }
5178 else
5179 {
5180 log_stream = stderr;
5181 setbuf(log_stream, NULL);
5182 }
5183
5184 #define L2TP_HDRS (20+8+6+4) // L2TP data encaptulation: ip + udp + l2tp (data) + ppp (inc hdlc)
5185 #define TCP_HDRS (20+20) // TCP encapsulation: ip + tcp
5186
5187 if (config->l2tp_mtu <= 0) config->l2tp_mtu = 1500; // ethernet default
5188 else if (config->l2tp_mtu < MINMTU) config->l2tp_mtu = MINMTU;
5189 else if (config->l2tp_mtu > MAXMTU) config->l2tp_mtu = MAXMTU;
5190
5191 // reset MRU/MSS globals
5192 MRU = config->l2tp_mtu - L2TP_HDRS;
5193 if (MRU > PPPoE_MRU)
5194 MRU = PPPoE_MRU;
5195
5196 MSS = MRU - TCP_HDRS;
5197
5198 // Update radius
5199 config->numradiusservers = 0;
5200 for (i = 0; i < MAXRADSERVER; i++)
5201 if (config->radiusserver[i])
5202 {
5203 config->numradiusservers++;
5204 // Set radius port: if not set, take the port from the
5205 // first radius server. For the first radius server,
5206 // take the #defined default value from l2tpns.h
5207
5208 // test twice, In case someone works with
5209 // a secondary radius server without defining
5210 // a primary one, this will work even then.
5211 if (i > 0 && !config->radiusport[i])
5212 config->radiusport[i] = config->radiusport[i-1];
5213 if (!config->radiusport[i])
5214 config->radiusport[i] = RADPORT;
5215 }
5216
5217 if (!config->numradiusservers)
5218 LOG(0, 0, 0, "No RADIUS servers defined!\n");
5219
5220 // parse radius_authtypes_s
5221 config->radius_authtypes = config->radius_authprefer = 0;
5222 p = config->radius_authtypes_s;
5223 while (p && *p)
5224 {
5225 char *s = strpbrk(p, " \t,");
5226 int type = 0;
5227
5228 if (s)
5229 {
5230 *s++ = 0;
5231 while (*s == ' ' || *s == '\t')
5232 s++;
5233
5234 if (!*s)
5235 s = 0;
5236 }
5237
5238 if (!strncasecmp("chap", p, strlen(p)))
5239 type = AUTHCHAP;
5240 else if (!strncasecmp("pap", p, strlen(p)))
5241 type = AUTHPAP;
5242 else
5243 LOG(0, 0, 0, "Invalid RADIUS authentication type \"%s\"\n", p);
5244
5245 config->radius_authtypes |= type;
5246 if (!config->radius_authprefer)
5247 config->radius_authprefer = type;
5248
5249 p = s;
5250 }
5251
5252 if (!config->radius_authtypes)
5253 {
5254 LOG(0, 0, 0, "Defaulting to PAP authentication\n");
5255 config->radius_authtypes = config->radius_authprefer = AUTHPAP;
5256 }
5257
5258 // normalise radius_authtypes_s
5259 if (config->radius_authprefer == AUTHPAP)
5260 {
5261 strcpy(config->radius_authtypes_s, "pap");
5262 if (config->radius_authtypes & AUTHCHAP)
5263 strcat(config->radius_authtypes_s, ", chap");
5264 }
5265 else
5266 {
5267 strcpy(config->radius_authtypes_s, "chap");
5268 if (config->radius_authtypes & AUTHPAP)
5269 strcat(config->radius_authtypes_s, ", pap");
5270 }
5271
5272 if (!config->radius_dae_port)
5273 config->radius_dae_port = DAEPORT;
5274
5275 #ifdef LAC
5276 if(!config->bind_portremotelns)
5277 config->bind_portremotelns = L2TPLACPORT;
5278 if(!config->bind_address_remotelns)
5279 config->bind_address_remotelns = INADDR_ANY;
5280 #endif
5281 if(!config->iftun_address)
5282 config->iftun_address = config->bind_address;
5283
5284 // re-initialise the random number source
5285 initrandom(config->random_device);
5286
5287 // Update plugins
5288 for (i = 0; i < MAXPLUGINS; i++)
5289 {
5290 if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
5291 continue;
5292
5293 if (*config->plugins[i])
5294 {
5295 // Plugin added
5296 add_plugin(config->plugins[i]);
5297 }
5298 else if (*config->old_plugins[i])
5299 {
5300 // Plugin removed
5301 remove_plugin(config->old_plugins[i]);
5302 }
5303 }
5304
5305 // Guest change
5306 guest_accounts_num = 0;
5307 char *p2 = config->guest_user;
5308 while (p2 && *p2)
5309 {
5310 char *s = strpbrk(p2, " \t,");
5311 if (s)
5312 {
5313 *s++ = 0;
5314 while (*s == ' ' || *s == '\t')
5315 s++;
5316
5317 if (!*s)
5318 s = 0;
5319 }
5320
5321 strcpy(guest_users[guest_accounts_num], p2);
5322 LOG(1, 0, 0, "Guest account[%d]: %s\n", guest_accounts_num, guest_users[guest_accounts_num]);
5323 guest_accounts_num++;
5324 p2 = s;
5325 }
5326 // Rebuild the guest_user array
5327 strcpy(config->guest_user, "");
5328 int ui = 0;
5329 for (ui=0; ui<guest_accounts_num; ui++)
5330 {
5331 strcat(config->guest_user, guest_users[ui]);
5332 if (ui<guest_accounts_num-1)
5333 {
5334 strcat(config->guest_user, ",");
5335 }
5336 }
5337
5338
5339 memcpy(config->old_plugins, config->plugins, sizeof(config->plugins));
5340 if (!config->multi_read_count) config->multi_read_count = 10;
5341 if (!config->cluster_address) config->cluster_address = inet_addr(DEFAULT_MCAST_ADDR);
5342 if (!*config->cluster_interface)
5343 strncpy(config->cluster_interface, DEFAULT_MCAST_INTERFACE, sizeof(config->cluster_interface) - 1);
5344
5345 if (!config->cluster_hb_interval)
5346 config->cluster_hb_interval = PING_INTERVAL; // Heartbeat every 0.5 seconds.
5347
5348 if (!config->cluster_hb_timeout)
5349 config->cluster_hb_timeout = HB_TIMEOUT; // 10 missed heartbeat triggers an election.
5350
5351 if (interval != config->cluster_hb_interval || timeout != config->cluster_hb_timeout)
5352 {
5353 // Paranoia: cluster_check_master() treats 2 x interval + 1 sec as
5354 // late, ensure we're sufficiently larger than that
5355 int t = 4 * config->cluster_hb_interval + 11;
5356
5357 if (config->cluster_hb_timeout < t)
5358 {
5359 LOG(0, 0, 0, "Heartbeat timeout %d too low, adjusting to %d\n", config->cluster_hb_timeout, t);
5360 config->cluster_hb_timeout = t;
5361 }
5362
5363 // Push timing changes to the slaves immediately if we're the master
5364 if (config->cluster_iam_master)
5365 cluster_heartbeat();
5366
5367 interval = config->cluster_hb_interval;
5368 timeout = config->cluster_hb_timeout;
5369 }
5370
5371 // Write PID file
5372 if (*config->pid_file == '/' && !config->wrote_pid)
5373 {
5374 FILE *f;
5375 if ((f = fopen(config->pid_file, "w")))
5376 {
5377 fprintf(f, "%d\n", getpid());
5378 fclose(f);
5379 config->wrote_pid = 1;
5380 }
5381 else
5382 {
5383 LOG(0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
5384 }
5385 }
5386 }
5387
5388 static void read_config_file()
5389 {
5390 FILE *f;
5391
5392 if (!config->config_file) return;
5393 if (!(f = fopen(config->config_file, "r")))
5394 {
5395 fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
5396 return;
5397 }
5398
5399 LOG(3, 0, 0, "Reading config file %s\n", config->config_file);
5400 cli_do_file(f);
5401 LOG(3, 0, 0, "Done reading config file\n");
5402 fclose(f);
5403 }
5404
5405 int sessionsetup(sessionidt s, tunnelidt t)
5406 {
5407 // A session now exists, set it up
5408 in_addr_t ip;
5409 char *user;
5410 sessionidt i;
5411 int r;
5412
5413 CSTAT(sessionsetup);
5414
5415 LOG(3, s, t, "Doing session setup for session\n");
5416
5417 // Join a bundle if the MRRU option is accepted
5418 if(session[s].mrru > 0 && session[s].bundle == 0)
5419 {
5420 LOG(3, s, t, "This session can be part of multilink bundle\n");
5421 if (join_bundle(s) > 0)
5422 cluster_send_bundle(session[s].bundle);
5423 else
5424 {
5425 LOG(0, s, t, "MPPP: Mismaching mssf option with other sessions in bundle\n");
5426 sessionshutdown(s, "Mismaching mssf option.", CDN_NONE, TERM_SERVICE_UNAVAILABLE);
5427 return 0;
5428 }
5429 }
5430
5431 if (!session[s].ip)
5432 {
5433 assign_ip_address(s);
5434 if (!session[s].ip)
5435 {
5436 LOG(0, s, t, " No IP allocated. The IP address pool is FULL!\n");
5437 sessionshutdown(s, "No IP addresses available.", CDN_TRY_ANOTHER, TERM_SERVICE_UNAVAILABLE);
5438 return 0;
5439 }
5440 LOG(3, s, t, " No IP allocated. Assigned %s from pool\n",
5441 fmtaddr(htonl(session[s].ip), 0));
5442 }
5443
5444 // Make sure this is right
5445 session[s].tunnel = t;
5446
5447 // zap old sessions with same IP and/or username
5448 // Don't kill gardened sessions - doing so leads to a DoS
5449 // from someone who doesn't need to know the password
5450 {
5451 ip = session[s].ip;
5452 user = session[s].user;
5453 for (i = 1; i <= config->cluster_highest_sessionid; i++)
5454 {
5455 if (i == s) continue;
5456 if (!session[s].opened) break;
5457 // Allow duplicate sessions for multilink ones of the same bundle.
5458 if (session[s].bundle && session[i].bundle && session[s].bundle == session[i].bundle) continue;
5459
5460 if (ip == session[i].ip)
5461 {
5462 sessionkill(i, "Duplicate IP address");
5463 cluster_listinvert_session(s, i);
5464 continue;
5465 }
5466
5467 if (config->allow_duplicate_users) continue;
5468 if (session[s].walled_garden || session[i].walled_garden) continue;
5469 // Guest change
5470 int found = 0;
5471 int gu;
5472 for (gu = 0; gu < guest_accounts_num; gu++)
5473 {
5474 if (!strcasecmp(user, guest_users[gu]))
5475 {
5476 found = 1;
5477 break;
5478 }
5479 }
5480 if (found) continue;
5481
5482 // Drop the new session in case of duplicate sessionss, not the old one.
5483 if (!strcasecmp(user, session[i].user))
5484 sessionkill(i, "Duplicate session for users");
5485 }
5486 }
5487
5488 // no need to set a route for the same IP address of the bundle
5489 if (!session[s].bundle || (bundle[session[s].bundle].num_of_links == 1))
5490 {
5491 int routed = 0;
5492
5493 // Add the route for this session.
5494 for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
5495 {
5496 if ((session[s].ip >> (32-session[s].route[r].prefixlen)) ==
5497 (session[s].route[r].ip >> (32-session[s].route[r].prefixlen)))
5498 routed++;
5499
5500 routeset(s, session[s].route[r].ip, session[s].route[r].prefixlen, 0, 1);
5501 }
5502
5503 // Static IPs need to be routed if not already
5504 // convered by a Framed-Route. Anything else is part
5505 // of the IP address pool and is already routed, it
5506 // just needs to be added to the IP cache.
5507 // IPv6 route setup is done in ppp.c, when IPV6CP is acked.
5508 if (session[s].ip_pool_index == -1) // static ip
5509 {
5510 if (!routed) routeset(s, session[s].ip, 0, 0, 1);
5511 }
5512 else
5513 cache_ipmap(session[s].ip, s);
5514 }
5515
5516 sess_local[s].lcp_authtype = 0; // RADIUS authentication complete
5517 lcp_open(s, t); // transition to Network phase and send initial IPCP
5518
5519 // Run the plugin's against this new session.
5520 {
5521 struct param_new_session data = { &tunnel[t], &session[s] };
5522 run_plugins(PLUGIN_NEW_SESSION, &data);
5523 }
5524
5525 // Allocate TBFs if throttled
5526 if (session[s].throttle_in || session[s].throttle_out)
5527 throttle_session(s, session[s].throttle_in, session[s].throttle_out);
5528
5529 session[s].last_packet = session[s].last_data = time_now;
5530
5531 LOG(2, s, t, "Login by %s at %s from %s (%s)\n", session[s].user,
5532 fmtaddr(htonl(session[s].ip), 0),
5533 fmtaddr(htonl(tunnel[t].ip), 1), tunnel[t].hostname);
5534
5535 cluster_send_session(s); // Mark it as dirty, and needing to the flooded to the cluster.
5536
5537 return 1; // RADIUS OK and IP allocated, done...
5538 }
5539
5540 //
5541 // This session just got dropped on us by the master or something.
5542 // Make sure our tables up up to date...
5543 //
5544 int load_session(sessionidt s, sessiont *new)
5545 {
5546 int i;
5547 int newip = 0;
5548
5549 // Sanity checks.
5550 if (new->ip_pool_index >= MAXIPPOOL ||
5551 new->tunnel >= MAXTUNNEL)
5552 {
5553 LOG(0, s, 0, "Strange session update received!\n");
5554 // FIXME! What to do here?
5555 return 0;
5556 }
5557
5558 //
5559 // Ok. All sanity checks passed. Now we're committed to
5560 // loading the new session.
5561 //
5562
5563 session[s].tunnel = new->tunnel; // For logging in cache_ipmap
5564
5565 // See if routes/ip cache need updating
5566 if (new->ip != session[s].ip)
5567 newip++;
5568
5569 for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
5570 if (new->route[i].ip != session[s].route[i].ip ||
5571 new->route[i].prefixlen != session[s].route[i].prefixlen)
5572 newip++;
5573
5574 // needs update
5575 if (newip)
5576 {
5577 int routed = 0;
5578
5579 // remove old routes...
5580 for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
5581 {
5582 if ((session[s].ip >> (32-session[s].route[i].prefixlen)) ==
5583 (session[s].route[i].ip >> (32-session[s].route[i].prefixlen)))
5584 routed++;
5585
5586 routeset(s, session[s].route[i].ip, session[s].route[i].prefixlen, 0, 0);
5587 }
5588
5589 // ...ip
5590 if (session[s].ip)
5591 {
5592 if (session[s].ip_pool_index == -1) // static IP
5593 {
5594 if (!routed) routeset(s, session[s].ip, 0, 0, 0);
5595 }
5596 else // It's part of the IP pool, remove it manually.
5597 uncache_ipmap(session[s].ip);
5598 }
5599
5600 routed = 0;
5601
5602 // add new routes...
5603 for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
5604 {
5605 if ((new->ip >> (32-new->route[i].prefixlen)) ==
5606 (new->route[i].ip >> (32-new->route[i].prefixlen)))
5607 routed++;
5608
5609 routeset(s, new->route[i].ip, new->route[i].prefixlen, 0, 1);
5610 }
5611
5612 // ...ip
5613 if (new->ip)
5614 {
5615 // If there's a new one, add it.
5616 if (new->ip_pool_index == -1)
5617 {
5618 if (!routed) routeset(s, new->ip, 0, 0, 1);
5619 }
5620 else
5621 cache_ipmap(new->ip, s);
5622 }
5623 }
5624
5625 // check v6 routing
5626 if (new->ipv6prefixlen && new->ppp.ipv6cp == Opened && session[s].ppp.ipv6cp != Opened)
5627 route6set(s, new->ipv6route, new->ipv6prefixlen, 1);
5628
5629 // check filters
5630 if (new->filter_in && (new->filter_in > MAXFILTER || !ip_filters[new->filter_in - 1].name[0]))
5631 {
5632 LOG(2, s, session[s].tunnel, "Dropping invalid input filter %u\n", (int) new->filter_in);
5633 new->filter_in = 0;
5634 }
5635
5636 if (new->filter_out && (new->filter_out > MAXFILTER || !ip_filters[new->filter_out - 1].name[0]))
5637 {
5638 LOG(2, s, session[s].tunnel, "Dropping invalid output filter %u\n", (int) new->filter_out);
5639 new->filter_out = 0;
5640 }
5641
5642 if (new->filter_in != session[s].filter_in)
5643 {
5644 if (session[s].filter_in) ip_filters[session[s].filter_in - 1].used--;
5645 if (new->filter_in) ip_filters[new->filter_in - 1].used++;
5646 }
5647
5648 if (new->filter_out != session[s].filter_out)
5649 {
5650 if (session[s].filter_out) ip_filters[session[s].filter_out - 1].used--;
5651 if (new->filter_out) ip_filters[new->filter_out - 1].used++;
5652 }
5653
5654 if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
5655 // for walking the sessions to forward byte counts to the master.
5656 config->cluster_highest_sessionid = s;
5657
5658 memcpy(&session[s], new, sizeof(session[s])); // Copy over..
5659
5660 // Do fixups into address pool.
5661 if (new->ip_pool_index != -1)
5662 fix_address_pool(s);
5663
5664 return 1;
5665 }
5666
5667 static void initplugins()
5668 {
5669 int i;
5670
5671 loaded_plugins = ll_init();
5672 // Initialize the plugins to nothing
5673 for (i = 0; i < MAX_PLUGIN_TYPES; i++)
5674 plugins[i] = ll_init();
5675 }
5676
5677 static void *open_plugin(char *plugin_name, int load)
5678 {
5679 char path[256] = "";
5680
5681 snprintf(path, 256, PLUGINDIR "/%s.so", plugin_name);
5682 LOG(2, 0, 0, "%soading plugin from %s\n", load ? "L" : "Un-l", path);
5683 return dlopen(path, RTLD_NOW);
5684 }
5685
5686 // plugin callback to get a config value
5687 static void *getconfig(char *key, enum config_typet type)
5688 {
5689 int i;
5690
5691 for (i = 0; config_values[i].key; i++)
5692 {
5693 if (!strcmp(config_values[i].key, key))
5694 {
5695 if (config_values[i].type == type)
5696 return ((void *) config) + config_values[i].offset;
5697
5698 LOG(1, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
5699 key, type, config_values[i].type);
5700
5701 return 0;
5702 }
5703 }
5704
5705 LOG(1, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
5706 return 0;
5707 }
5708
5709 static int add_plugin(char *plugin_name)
5710 {
5711 static struct pluginfuncs funcs = {
5712 _log,
5713 _log_hex,
5714 fmtaddr,
5715 sessionbyuser,
5716 sessiontbysessionidt,
5717 sessionidtbysessiont,
5718 radiusnew,
5719 radiussend,
5720 getconfig,
5721 sessionshutdown,
5722 sessionkill,
5723 throttle_session,
5724 cluster_send_session,
5725 };
5726
5727 void *p = open_plugin(plugin_name, 1);
5728 int (*initfunc)(struct pluginfuncs *);
5729 int i;
5730
5731 if (!p)
5732 {
5733 LOG(1, 0, 0, " Plugin load failed: %s\n", dlerror());
5734 return -1;
5735 }
5736
5737 if (ll_contains(loaded_plugins, p))
5738 {
5739 dlclose(p);
5740 return 0; // already loaded
5741 }
5742
5743 {
5744 int *v = dlsym(p, "plugin_api_version");
5745 if (!v || *v != PLUGIN_API_VERSION)
5746 {
5747 LOG(1, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
5748 dlclose(p);
5749 return -1;
5750 }
5751 }
5752
5753 if ((initfunc = dlsym(p, "plugin_init")))
5754 {
5755 if (!initfunc(&funcs))
5756 {
5757 LOG(1, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
5758 dlclose(p);
5759 return -1;
5760 }
5761 }
5762
5763 ll_push(loaded_plugins, p);
5764
5765 for (i = 0; i < max_plugin_functions; i++)
5766 {
5767 void *x;
5768 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5769 {
5770 LOG(3, 0, 0, " Supports function \"%s\"\n", plugin_functions[i]);
5771 ll_push(plugins[i], x);
5772 }
5773 }
5774
5775 LOG(2, 0, 0, " Loaded plugin %s\n", plugin_name);
5776 return 1;
5777 }
5778
5779 static void run_plugin_done(void *plugin)
5780 {
5781 int (*donefunc)(void) = dlsym(plugin, "plugin_done");
5782
5783 if (donefunc)
5784 donefunc();
5785 }
5786
5787 static int remove_plugin(char *plugin_name)
5788 {
5789 void *p = open_plugin(plugin_name, 0);
5790 int loaded = 0;
5791
5792 if (!p)
5793 return -1;
5794
5795 if (ll_contains(loaded_plugins, p))
5796 {
5797 int i;
5798 for (i = 0; i < max_plugin_functions; i++)
5799 {
5800 void *x;
5801 if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
5802 ll_delete(plugins[i], x);
5803 }
5804
5805 ll_delete(loaded_plugins, p);
5806 run_plugin_done(p);
5807 loaded = 1;
5808 }
5809
5810 dlclose(p);
5811 LOG(2, 0, 0, "Removed plugin %s\n", plugin_name);
5812 return loaded;
5813 }
5814
5815 int run_plugins(int plugin_type, void *data)
5816 {
5817 int (*func)(void *data);
5818
5819 if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
5820 return PLUGIN_RET_ERROR;
5821
5822 ll_reset(plugins[plugin_type]);
5823 while ((func = ll_next(plugins[plugin_type])))
5824 {
5825 int r = func(data);
5826
5827 if (r != PLUGIN_RET_OK)
5828 return r; // stop here
5829 }
5830
5831 return PLUGIN_RET_OK;
5832 }
5833
5834 static void plugins_done()
5835 {
5836 void *p;
5837
5838 ll_reset(loaded_plugins);
5839 while ((p = ll_next(loaded_plugins)))
5840 run_plugin_done(p);
5841 }
5842
5843 static void processcontrol(uint8_t *buf, int len, struct sockaddr_in *addr, int alen, struct in_addr *local)
5844 {
5845 struct nsctl request;
5846 struct nsctl response;
5847 int type = unpack_control(&request, buf, len);
5848 int r;
5849 void *p;
5850
5851 if (log_stream && config->debug >= 4)
5852 {
5853 if (type < 0)
5854 {
5855 LOG(4, 0, 0, "Bogus control message from %s (%d)\n",
5856 fmtaddr(addr->sin_addr.s_addr, 0), type);
5857 }
5858 else
5859 {
5860 LOG(4, 0, 0, "Received [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
5861 dump_control(&request, log_stream);
5862 }
5863 }
5864
5865 switch (type)
5866 {
5867 case NSCTL_REQ_LOAD:
5868 if (request.argc != 1)
5869 {
5870 response.type = NSCTL_RES_ERR;
5871 response.argc = 1;
5872 response.argv[0] = "name of plugin required";
5873 }
5874 else if ((r = add_plugin(request.argv[0])) < 1)
5875 {
5876 response.type = NSCTL_RES_ERR;
5877 response.argc = 1;
5878 response.argv[0] = !r
5879 ? "plugin already loaded"
5880 : "error loading plugin";
5881 }
5882 else
5883 {
5884 response.type = NSCTL_RES_OK;
5885 response.argc = 0;
5886 }
5887
5888 break;
5889
5890 case NSCTL_REQ_UNLOAD:
5891 if (request.argc != 1)
5892 {
5893 response.type = NSCTL_RES_ERR;
5894 response.argc = 1;
5895 response.argv[0] = "name of plugin required";
5896 }
5897 else if ((r = remove_plugin(request.argv[0])) < 1)
5898 {
5899 response.type = NSCTL_RES_ERR;
5900 response.argc = 1;
5901 response.argv[0] = !r
5902 ? "plugin not loaded"
5903 : "plugin not found";
5904 }
5905 else
5906 {
5907 response.type = NSCTL_RES_OK;
5908 response.argc = 0;
5909 }
5910
5911 break;
5912
5913 case NSCTL_REQ_HELP:
5914 response.type = NSCTL_RES_OK;
5915 response.argc = 0;
5916
5917 ll_reset(loaded_plugins);
5918 while ((p = ll_next(loaded_plugins)))
5919 {
5920 char **help = dlsym(p, "plugin_control_help");
5921 while (response.argc < 0xff && help && *help)
5922 response.argv[response.argc++] = *help++;
5923 }
5924
5925 break;
5926
5927 case NSCTL_REQ_CONTROL:
5928 {
5929 struct param_control param = {
5930 config->cluster_iam_master,
5931 request.argc,
5932 request.argv,
5933 0,
5934 NULL,
5935 };
5936
5937 int r = run_plugins(PLUGIN_CONTROL, &param);
5938
5939 if (r == PLUGIN_RET_ERROR)
5940 {
5941 response.type = NSCTL_RES_ERR;
5942 response.argc = 1;
5943 response.argv[0] = param.additional
5944 ? param.additional
5945 : "error returned by plugin";
5946 }
5947 else if (r == PLUGIN_RET_NOTMASTER)
5948 {
5949 static char msg[] = "must be run on master: 000.000.000.000";
5950
5951 response.type = NSCTL_RES_ERR;
5952 response.argc = 1;
5953 if (config->cluster_master_address)
5954 {
5955 strcpy(msg + 23, fmtaddr(config->cluster_master_address, 0));
5956 response.argv[0] = msg;
5957 }
5958 else
5959 {
5960 response.argv[0] = "must be run on master: none elected";
5961 }
5962 }
5963 else if (!(param.response & NSCTL_RESPONSE))
5964 {
5965 response.type = NSCTL_RES_ERR;
5966 response.argc = 1;
5967 response.argv[0] = param.response
5968 ? "unrecognised response value from plugin"
5969 : "unhandled action";
5970 }
5971 else
5972 {
5973 response.type = param.response;
5974 response.argc = 0;
5975 if (param.additional)
5976 {
5977 response.argc = 1;
5978 response.argv[0] = param.additional;
5979 }
5980 }
5981 }
5982
5983 break;
5984
5985 default:
5986 response.type = NSCTL_RES_ERR;
5987 response.argc = 1;
5988 response.argv[0] = "error unpacking control packet";
5989 }
5990
5991 buf = calloc(NSCTL_MAX_PKT_SZ, 1);
5992 if (!buf)
5993 {
5994 LOG(2, 0, 0, "Failed to allocate nsctl response\n");
5995 return;
5996 }
5997
5998 r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
5999 if (r > 0)
6000 {
6001 sendtofrom(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen, local);
6002 if (log_stream && config->debug >= 4)
6003 {
6004 LOG(4, 0, 0, "Sent [%s] ", fmtaddr(addr->sin_addr.s_addr, 0));
6005 dump_control(&response, log_stream);
6006 }
6007 }
6008 else
6009 LOG(2, 0, 0, "Failed to pack nsctl response for %s (%d)\n",
6010 fmtaddr(addr->sin_addr.s_addr, 0), r);
6011
6012 free(buf);
6013 }
6014
6015 static tunnelidt new_tunnel()
6016 {
6017 tunnelidt i;
6018 for (i = 1; i < MAXTUNNEL; i++)
6019 {
6020 if (tunnel[i].state == TUNNELFREE)
6021 {
6022 LOG(4, 0, i, "Assigning tunnel ID %u\n", i);
6023 if (i > config->cluster_highest_tunnelid)
6024 config->cluster_highest_tunnelid = i;
6025 return i;
6026 }
6027 }
6028 LOG(0, 0, 0, "Can't find a free tunnel! There shouldn't be this many in use!\n");
6029 return 0;
6030 }
6031
6032 //
6033 // We're becoming the master. Do any required setup..
6034 //
6035 // This is principally telling all the plugins that we're
6036 // now a master, and telling them about all the sessions
6037 // that are active too..
6038 //
6039 void become_master(void)
6040 {
6041 int s, i;
6042 static struct event_data d[RADIUS_FDS];
6043 struct epoll_event e;
6044
6045 run_plugins(PLUGIN_BECOME_MASTER, NULL);
6046
6047 // running a bunch of iptables commands is slow and can cause
6048 // the master to drop tunnels on takeover--kludge around the
6049 // problem by forking for the moment (note: race)
6050 if (!fork_and_close())
6051 {
6052 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6053 {
6054 if (!session[s].opened) // Not an in-use session.
6055 continue;
6056
6057 run_plugins(PLUGIN_NEW_SESSION_MASTER, &session[s]);
6058 }
6059 exit(0);
6060 }
6061
6062 // add radius fds
6063 e.events = EPOLLIN;
6064 for (i = 0; i < RADIUS_FDS; i++)
6065 {
6066 d[i].type = FD_TYPE_RADIUS;
6067 d[i].index = i;
6068 e.data.ptr = &d[i];
6069
6070 epoll_ctl(epollfd, EPOLL_CTL_ADD, radfds[i], &e);
6071 }
6072 }
6073
6074 int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc)
6075 {
6076 int s, i;
6077 int count = 0;
6078 int buckets[64];
6079
6080 if (CLI_HELP_REQUESTED)
6081 return CLI_HELP_NO_ARGS;
6082
6083 time(&time_now);
6084 for (i = 0; i < 64;++i) buckets[i] = 0;
6085
6086 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6087 {
6088 int idle;
6089 if (!session[s].opened)
6090 continue;
6091
6092 idle = time_now - session[s].last_data;
6093 idle /= 5 ; // In multiples of 5 seconds.
6094 if (idle < 0)
6095 idle = 0;
6096 if (idle > 63)
6097 idle = 63;
6098
6099 ++count;
6100 ++buckets[idle];
6101 }
6102
6103 for (i = 0; i < 63; ++i)
6104 {
6105 cli_print(cli, "%3d seconds : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
6106 }
6107 cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
6108 cli_print(cli, "%d total sessions open.", count);
6109 return CLI_OK;
6110 }
6111
6112 int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc)
6113 {
6114 int s, i;
6115 int count = 0;
6116 int buckets[64];
6117
6118 if (CLI_HELP_REQUESTED)
6119 return CLI_HELP_NO_ARGS;
6120
6121 time(&time_now);
6122 for (i = 0; i < 64;++i) buckets[i] = 0;
6123
6124 for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
6125 {
6126 int open = 0, d;
6127 if (!session[s].opened)
6128 continue;
6129
6130 d = time_now - session[s].opened;
6131 if (d < 0)
6132 d = 0;
6133 while (d > 1 && open < 32)
6134 {
6135 ++open;
6136 d >>= 1; // half.
6137 }
6138 ++count;
6139 ++buckets[open];
6140 }
6141
6142 s = 1;
6143 for (i = 0; i < 30; ++i)
6144 {
6145 cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
6146 s <<= 1;
6147 }
6148 cli_print(cli, "%d total sessions open.", count);
6149 return CLI_OK;
6150 }
6151
6152 /* Unhide an avp.
6153 *
6154 * This unencodes the AVP using the L2TP secret and the previously
6155 * stored random vector. It overwrites the hidden data with the
6156 * unhidden AVP subformat.
6157 */
6158 static void unhide_value(uint8_t *value, size_t len, uint16_t type, uint8_t *vector, size_t vec_len)
6159 {
6160 MD5_CTX ctx;
6161 uint8_t digest[16];
6162 uint8_t *last;
6163 size_t d = 0;
6164 uint16_t m = htons(type);
6165
6166 // Compute initial pad
6167 MD5_Init(&ctx);
6168 MD5_Update(&ctx, (unsigned char *) &m, 2);
6169 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6170 MD5_Update(&ctx, vector, vec_len);
6171 MD5_Final(digest, &ctx);
6172
6173 // pointer to last decoded 16 octets
6174 last = value;
6175
6176 while (len > 0)
6177 {
6178 // calculate a new pad based on the last decoded block
6179 if (d >= sizeof(digest))
6180 {
6181 MD5_Init(&ctx);
6182 MD5_Update(&ctx, config->l2tp_secret, strlen(config->l2tp_secret));
6183 MD5_Update(&ctx, last, sizeof(digest));
6184 MD5_Final(digest, &ctx);
6185
6186 d = 0;
6187 last = value;
6188 }
6189
6190 *value++ ^= digest[d++];
6191 len--;
6192 }
6193 }
6194
6195 int find_filter(char const *name, size_t len)
6196 {
6197 int free = -1;
6198 int i;
6199
6200 for (i = 0; i < MAXFILTER; i++)
6201 {
6202 if (!*ip_filters[i].name)
6203 {
6204 if (free < 0)
6205 free = i;
6206
6207 continue;
6208 }
6209
6210 if (strlen(ip_filters[i].name) != len)
6211 continue;
6212
6213 if (!strncmp(ip_filters[i].name, name, len))
6214 return i;
6215 }
6216
6217 return free;
6218 }
6219
6220 static int ip_filter_port(ip_filter_portt *p, uint16_t port)
6221 {
6222 switch (p->op)
6223 {
6224 case FILTER_PORT_OP_EQ: return port == p->port;
6225 case FILTER_PORT_OP_NEQ: return port != p->port;
6226 case FILTER_PORT_OP_GT: return port > p->port;
6227 case FILTER_PORT_OP_LT: return port < p->port;
6228 case FILTER_PORT_OP_RANGE: return port >= p->port && port <= p->port2;
6229 }
6230
6231 return 0;
6232 }
6233
6234 static int ip_filter_flag(uint8_t op, uint8_t sflags, uint8_t cflags, uint8_t flags)
6235 {
6236 switch (op)
6237 {
6238 case FILTER_FLAG_OP_ANY:
6239 return (flags & sflags) || (~flags & cflags);
6240
6241 case FILTER_FLAG_OP_ALL:
6242 return (flags & sflags) == sflags && (~flags & cflags) == cflags;
6243
6244 case FILTER_FLAG_OP_EST:
6245 return (flags & (TCP_FLAG_ACK|TCP_FLAG_RST)) && (~flags & TCP_FLAG_SYN);
6246 }
6247
6248 return 0;
6249 }
6250
6251 int ip_filter(uint8_t *buf, int len, uint8_t filter)
6252 {
6253 uint16_t frag_offset;
6254 uint8_t proto;
6255 in_addr_t src_ip;
6256 in_addr_t dst_ip;
6257 uint16_t src_port = 0;
6258 uint16_t dst_port = 0;
6259 uint8_t flags = 0;
6260 ip_filter_rulet *rule;
6261
6262 if (len < 20) // up to end of destination address
6263 return 0;
6264
6265 if ((*buf >> 4) != 4) // IPv4
6266 return 0;
6267
6268 frag_offset = ntohs(*(uint16_t *) (buf + 6)) & 0x1fff;
6269 proto = buf[9];
6270 src_ip = *(in_addr_t *) (buf + 12);
6271 dst_ip = *(in_addr_t *) (buf + 16);
6272
6273 if (frag_offset == 0 && (proto == IPPROTO_TCP || proto == IPPROTO_UDP))
6274 {
6275 int l = (buf[0] & 0xf) * 4; // length of IP header
6276 if (len < l + 4) // ports
6277 return 0;
6278
6279 src_port = ntohs(*(uint16_t *) (buf + l));
6280 dst_port = ntohs(*(uint16_t *) (buf + l + 2));
6281 if (proto == IPPROTO_TCP)
6282 {
6283 if (len < l + 14) // flags
6284 return 0;
6285
6286 flags = buf[l + 13] & 0x3f;
6287 }
6288 }
6289
6290 for (rule = ip_filters[filter].rules; rule->action; rule++)
6291 {
6292 if (rule->proto != IPPROTO_IP && proto != rule->proto)
6293 continue;
6294
6295 if (rule->src_wild != INADDR_BROADCAST &&
6296 (src_ip & ~rule->src_wild) != (rule->src_ip & ~rule->src_wild))
6297 continue;
6298
6299 if (rule->dst_wild != INADDR_BROADCAST &&
6300 (dst_ip & ~rule->dst_wild) != (rule->dst_ip & ~rule->dst_wild))
6301 continue;
6302
6303 if (frag_offset)
6304 {
6305 // layer 4 deny rules are skipped
6306 if (rule->action == FILTER_ACTION_DENY &&
6307 (rule->src_ports.op || rule->dst_ports.op || rule->tcp_flag_op))
6308 continue;
6309 }
6310 else
6311 {
6312 if (rule->frag)
6313 continue;
6314
6315 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
6316 {
6317 if (rule->src_ports.op && !ip_filter_port(&rule->src_ports, src_port))
6318 continue;
6319
6320 if (rule->dst_ports.op && !ip_filter_port(&rule->dst_ports, dst_port))
6321 continue;
6322
6323 if (proto == IPPROTO_TCP && rule->tcp_flag_op &&
6324 !ip_filter_flag(rule->tcp_flag_op, rule->tcp_sflags, rule->tcp_cflags, flags))
6325 continue;
6326 }
6327 }
6328
6329 // matched
6330 rule->counter++;
6331 return rule->action == FILTER_ACTION_PERMIT;
6332 }
6333
6334 // default deny
6335 return 0;
6336 }
6337
6338 #ifdef LAC
6339
6340 tunnelidt lac_new_tunnel()
6341 {
6342 return new_tunnel();
6343 }
6344
6345 void lac_tunnelclear(tunnelidt t)
6346 {
6347 tunnelclear(t);
6348 }
6349
6350 void lac_send_SCCRQ(tunnelidt t, uint8_t * auth, unsigned int auth_len)
6351 {
6352 uint16_t version = 0x0100; // protocol version
6353
6354 tunnel[t].state = TUNNELOPENING;
6355
6356 // Sent SCCRQ - Start Control Connection Request
6357 controlt *c = controlnew(1); // sending SCCRQ
6358 controls(c, 7, hostname, 1); // host name
6359 controls(c, 8, Vendor_name, 1); // Vendor name
6360 control16(c, 2, version, 1); // protocol version
6361 control32(c, 3, 3, 1); // framing Capabilities
6362 control16(c, 9, t, 1); // assigned tunnel
6363 controlb(c, 11, (uint8_t *) auth, auth_len, 1); // CHAP Challenge
6364 LOG(3, 0, t, "Sent SCCRQ to REMOTE LNS\n");
6365 controladd(c, 0, t); // send
6366 }
6367
6368 void lac_send_ICRQ(tunnelidt t, sessionidt s)
6369 {
6370 // Sent ICRQ Incoming-call-request
6371 controlt *c = controlnew(10); // ICRQ
6372
6373 control16(c, 14, s, 1); // assigned sesion
6374 call_serial_number++;
6375 control32(c, 15, call_serial_number, 1); // call serial number
6376 LOG(3, s, t, "Sent ICRQ to REMOTE LNS (far ID %u)\n", tunnel[t].far);
6377 controladd(c, 0, t); // send
6378 }
6379
6380 void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *msg)
6381 {
6382 tunnelshutdown(t, reason, result, error, msg);
6383 }
6384
6385 #endif